hub.c 145.1 KB
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/*
 * USB hub driver.
 *
 * (C) Copyright 1999 Linus Torvalds
 * (C) Copyright 1999 Johannes Erdfelt
 * (C) Copyright 1999 Gregory P. Smith
 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
 *
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/completion.h>
#include <linux/sched.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/ioctl.h>
#include <linux/usb.h>
#include <linux/usbdevice_fs.h>
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#include <linux/usb/hcd.h>
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#include <linux/usb/otg.h>
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#include <linux/usb/quirks.h>
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#include <linux/kthread.h>
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#include <linux/mutex.h>
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#include <linux/freezer.h>
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#include <linux/random.h>
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#include <asm/uaccess.h>
#include <asm/byteorder.h>

#include "usb.h"

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/* if we are in debug mode, always announce new devices */
#ifdef DEBUG
#ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
#define CONFIG_USB_ANNOUNCE_NEW_DEVICES
#endif
#endif

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struct usb_port {
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	struct usb_device *child;
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	struct device dev;
	struct dev_state *port_owner;
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	enum usb_port_connect_type connect_type;
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};

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struct usb_hub {
	struct device		*intfdev;	/* the "interface" device */
	struct usb_device	*hdev;
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	struct kref		kref;
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	struct urb		*urb;		/* for interrupt polling pipe */

	/* buffer for urb ... with extra space in case of babble */
	char			(*buffer)[8];
	union {
		struct usb_hub_status	hub;
		struct usb_port_status	port;
	}			*status;	/* buffer for status reports */
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	struct mutex		status_mutex;	/* for the status buffer */
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	int			error;		/* last reported error */
	int			nerrors;	/* track consecutive errors */

	struct list_head	event_list;	/* hubs w/data or errs ready */
	unsigned long		event_bits[1];	/* status change bitmask */
	unsigned long		change_bits[1];	/* ports with logical connect
							status change */
	unsigned long		busy_bits[1];	/* ports being reset or
							resumed */
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	unsigned long		removed_bits[1]; /* ports with a "removed"
							device present */
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	unsigned long		wakeup_bits[1];	/* ports that have signaled
							remote wakeup */
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#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
#error event_bits[] is too short!
#endif

	struct usb_hub_descriptor *descriptor;	/* class descriptor */
	struct usb_tt		tt;		/* Transaction Translator */

	unsigned		mA_per_port;	/* current for each child */

	unsigned		limited_power:1;
	unsigned		quiescing:1;
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	unsigned		disconnected:1;
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	unsigned		has_indicators:1;
	u8			indicator[USB_MAXCHILDREN];
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	struct delayed_work	leds;
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	struct delayed_work	init_work;
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	struct usb_port		**ports;
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};

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static inline int hub_is_superspeed(struct usb_device *hdev)
{
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	return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS);
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}
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/* Protect struct usb_device->state and ->children members
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 * Note: Both are also protected by ->dev.sem, except that ->state can
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 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
static DEFINE_SPINLOCK(device_state_lock);

/* khubd's worklist and its lock */
static DEFINE_SPINLOCK(hub_event_lock);
static LIST_HEAD(hub_event_list);	/* List of hubs needing servicing */

/* Wakes up khubd */
static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);

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static struct task_struct *khubd_task;
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/* cycle leds on hubs that aren't blinking for attention */
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static bool blinkenlights = 0;
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module_param (blinkenlights, bool, S_IRUGO);
MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");

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/*
 * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
 * 10 seconds to send reply for the initial 64-byte descriptor request.
 */
/* define initial 64-byte descriptor request timeout in milliseconds */
static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT;
module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR);
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MODULE_PARM_DESC(initial_descriptor_timeout,
		"initial 64-byte descriptor request timeout in milliseconds "
		"(default 5000 - 5.0 seconds)");
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/*
 * As of 2.6.10 we introduce a new USB device initialization scheme which
 * closely resembles the way Windows works.  Hopefully it will be compatible
 * with a wider range of devices than the old scheme.  However some previously
 * working devices may start giving rise to "device not accepting address"
 * errors; if that happens the user can try the old scheme by adjusting the
 * following module parameters.
 *
 * For maximum flexibility there are two boolean parameters to control the
 * hub driver's behavior.  On the first initialization attempt, if the
 * "old_scheme_first" parameter is set then the old scheme will be used,
 * otherwise the new scheme is used.  If that fails and "use_both_schemes"
 * is set, then the driver will make another attempt, using the other scheme.
 */
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static bool old_scheme_first = 0;
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module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(old_scheme_first,
		 "start with the old device initialization scheme");

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static bool use_both_schemes = 1;
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module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(use_both_schemes,
		"try the other device initialization scheme if the "
		"first one fails");

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/* Mutual exclusion for EHCI CF initialization.  This interferes with
 * port reset on some companion controllers.
 */
DECLARE_RWSEM(ehci_cf_port_reset_rwsem);
EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem);

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#define HUB_DEBOUNCE_TIMEOUT	1500
#define HUB_DEBOUNCE_STEP	  25
#define HUB_DEBOUNCE_STABLE	 100

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#define to_usb_port(_dev) \
	container_of(_dev, struct usb_port, dev)
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static int usb_reset_and_verify_device(struct usb_device *udev);

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static inline char *portspeed(struct usb_hub *hub, int portstatus)
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{
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	if (hub_is_superspeed(hub->hdev))
		return "5.0 Gb/s";
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	if (portstatus & USB_PORT_STAT_HIGH_SPEED)
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    		return "480 Mb/s";
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	else if (portstatus & USB_PORT_STAT_LOW_SPEED)
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		return "1.5 Mb/s";
	else
		return "12 Mb/s";
}

/* Note that hdev or one of its children must be locked! */
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static struct usb_hub *hdev_to_hub(struct usb_device *hdev)
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{
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	if (!hdev || !hdev->actconfig || !hdev->maxchild)
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		return NULL;
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	return usb_get_intfdata(hdev->actconfig->interface[0]);
}

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static int usb_device_supports_lpm(struct usb_device *udev)
{
	/* USB 2.1 (and greater) devices indicate LPM support through
	 * their USB 2.0 Extended Capabilities BOS descriptor.
	 */
	if (udev->speed == USB_SPEED_HIGH) {
		if (udev->bos->ext_cap &&
			(USB_LPM_SUPPORT &
			 le32_to_cpu(udev->bos->ext_cap->bmAttributes)))
			return 1;
		return 0;
	}
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	/* All USB 3.0 must support LPM, but we need their max exit latency
	 * information from the SuperSpeed Extended Capabilities BOS descriptor.
	 */
	if (!udev->bos->ss_cap) {
		dev_warn(&udev->dev, "No LPM exit latency info found.  "
				"Power management will be impacted.\n");
		return 0;
	}
	if (udev->parent->lpm_capable)
		return 1;

	dev_warn(&udev->dev, "Parent hub missing LPM exit latency info.  "
			"Power management will be impacted.\n");
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	return 0;
}

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/*
 * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from
 * either U1 or U2.
 */
static void usb_set_lpm_mel(struct usb_device *udev,
		struct usb3_lpm_parameters *udev_lpm_params,
		unsigned int udev_exit_latency,
		struct usb_hub *hub,
		struct usb3_lpm_parameters *hub_lpm_params,
		unsigned int hub_exit_latency)
{
	unsigned int total_mel;
	unsigned int device_mel;
	unsigned int hub_mel;

	/*
	 * Calculate the time it takes to transition all links from the roothub
	 * to the parent hub into U0.  The parent hub must then decode the
	 * packet (hub header decode latency) to figure out which port it was
	 * bound for.
	 *
	 * The Hub Header decode latency is expressed in 0.1us intervals (0x1
	 * means 0.1us).  Multiply that by 100 to get nanoseconds.
	 */
	total_mel = hub_lpm_params->mel +
		(hub->descriptor->u.ss.bHubHdrDecLat * 100);

	/*
	 * How long will it take to transition the downstream hub's port into
	 * U0?  The greater of either the hub exit latency or the device exit
	 * latency.
	 *
	 * The BOS U1/U2 exit latencies are expressed in 1us intervals.
	 * Multiply that by 1000 to get nanoseconds.
	 */
	device_mel = udev_exit_latency * 1000;
	hub_mel = hub_exit_latency * 1000;
	if (device_mel > hub_mel)
		total_mel += device_mel;
	else
		total_mel += hub_mel;

	udev_lpm_params->mel = total_mel;
}

/*
 * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate
 * a transition from either U1 or U2.
 */
static void usb_set_lpm_pel(struct usb_device *udev,
		struct usb3_lpm_parameters *udev_lpm_params,
		unsigned int udev_exit_latency,
		struct usb_hub *hub,
		struct usb3_lpm_parameters *hub_lpm_params,
		unsigned int hub_exit_latency,
		unsigned int port_to_port_exit_latency)
{
	unsigned int first_link_pel;
	unsigned int hub_pel;

	/*
	 * First, the device sends an LFPS to transition the link between the
	 * device and the parent hub into U0.  The exit latency is the bigger of
	 * the device exit latency or the hub exit latency.
	 */
	if (udev_exit_latency > hub_exit_latency)
		first_link_pel = udev_exit_latency * 1000;
	else
		first_link_pel = hub_exit_latency * 1000;

	/*
	 * When the hub starts to receive the LFPS, there is a slight delay for
	 * it to figure out that one of the ports is sending an LFPS.  Then it
	 * will forward the LFPS to its upstream link.  The exit latency is the
	 * delay, plus the PEL that we calculated for this hub.
	 */
	hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel;

	/*
	 * According to figure C-7 in the USB 3.0 spec, the PEL for this device
	 * is the greater of the two exit latencies.
	 */
	if (first_link_pel > hub_pel)
		udev_lpm_params->pel = first_link_pel;
	else
		udev_lpm_params->pel = hub_pel;
}

/*
 * Set the System Exit Latency (SEL) to indicate the total worst-case time from
 * when a device initiates a transition to U0, until when it will receive the
 * first packet from the host controller.
 *
 * Section C.1.5.1 describes the four components to this:
 *  - t1: device PEL
 *  - t2: time for the ERDY to make it from the device to the host.
 *  - t3: a host-specific delay to process the ERDY.
 *  - t4: time for the packet to make it from the host to the device.
 *
 * t3 is specific to both the xHCI host and the platform the host is integrated
 * into.  The Intel HW folks have said it's negligible, FIXME if a different
 * vendor says otherwise.
 */
static void usb_set_lpm_sel(struct usb_device *udev,
		struct usb3_lpm_parameters *udev_lpm_params)
{
	struct usb_device *parent;
	unsigned int num_hubs;
	unsigned int total_sel;

	/* t1 = device PEL */
	total_sel = udev_lpm_params->pel;
	/* How many external hubs are in between the device & the root port. */
	for (parent = udev->parent, num_hubs = 0; parent->parent;
			parent = parent->parent)
		num_hubs++;
	/* t2 = 2.1us + 250ns * (num_hubs - 1) */
	if (num_hubs > 0)
		total_sel += 2100 + 250 * (num_hubs - 1);

	/* t4 = 250ns * num_hubs */
	total_sel += 250 * num_hubs;

	udev_lpm_params->sel = total_sel;
}

static void usb_set_lpm_parameters(struct usb_device *udev)
{
	struct usb_hub *hub;
	unsigned int port_to_port_delay;
	unsigned int udev_u1_del;
	unsigned int udev_u2_del;
	unsigned int hub_u1_del;
	unsigned int hub_u2_del;

	if (!udev->lpm_capable || udev->speed != USB_SPEED_SUPER)
		return;

	hub = hdev_to_hub(udev->parent);
	/* It doesn't take time to transition the roothub into U0, since it
	 * doesn't have an upstream link.
	 */
	if (!hub)
		return;

	udev_u1_del = udev->bos->ss_cap->bU1devExitLat;
	udev_u2_del = udev->bos->ss_cap->bU2DevExitLat;
	hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat;
	hub_u2_del = udev->parent->bos->ss_cap->bU2DevExitLat;

	usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del,
			hub, &udev->parent->u1_params, hub_u1_del);

	usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del,
			hub, &udev->parent->u2_params, hub_u2_del);

	/*
	 * Appendix C, section C.2.2.2, says that there is a slight delay from
	 * when the parent hub notices the downstream port is trying to
	 * transition to U0 to when the hub initiates a U0 transition on its
	 * upstream port.  The section says the delays are tPort2PortU1EL and
	 * tPort2PortU2EL, but it doesn't define what they are.
	 *
	 * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking
	 * about the same delays.  Use the maximum delay calculations from those
	 * sections.  For U1, it's tHubPort2PortExitLat, which is 1us max.  For
	 * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat.  I
	 * assume the device exit latencies they are talking about are the hub
	 * exit latencies.
	 *
	 * What do we do if the U2 exit latency is less than the U1 exit
	 * latency?  It's possible, although not likely...
	 */
	port_to_port_delay = 1;

	usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del,
			hub, &udev->parent->u1_params, hub_u1_del,
			port_to_port_delay);

	if (hub_u2_del > hub_u1_del)
		port_to_port_delay = 1 + hub_u2_del - hub_u1_del;
	else
		port_to_port_delay = 1 + hub_u1_del;

	usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del,
			hub, &udev->parent->u2_params, hub_u2_del,
			port_to_port_delay);

	/* Now that we've got PEL, calculate SEL. */
	usb_set_lpm_sel(udev, &udev->u1_params);
	usb_set_lpm_sel(udev, &udev->u2_params);
}

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/* USB 2.0 spec Section 11.24.4.5 */
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static int get_hub_descriptor(struct usb_device *hdev, void *data)
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{
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	int i, ret, size;
	unsigned dtype;

	if (hub_is_superspeed(hdev)) {
		dtype = USB_DT_SS_HUB;
		size = USB_DT_SS_HUB_SIZE;
	} else {
		dtype = USB_DT_HUB;
		size = sizeof(struct usb_hub_descriptor);
	}
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	for (i = 0; i < 3; i++) {
		ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
			USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
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			dtype << 8, 0, data, size,
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			USB_CTRL_GET_TIMEOUT);
		if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
			return ret;
	}
	return -EINVAL;
}

/*
 * USB 2.0 spec Section 11.24.2.1
 */
static int clear_hub_feature(struct usb_device *hdev, int feature)
{
	return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
		USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
}

/*
 * USB 2.0 spec Section 11.24.2.2
 */
static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
{
	return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
		USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
		NULL, 0, 1000);
}

/*
 * USB 2.0 spec Section 11.24.2.13
 */
static int set_port_feature(struct usb_device *hdev, int port1, int feature)
{
	return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
		USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
		NULL, 0, 1000);
}

/*
 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
 * for info about using port indicators
 */
static void set_port_led(
	struct usb_hub *hub,
	int port1,
	int selector
)
{
	int status = set_port_feature(hub->hdev, (selector << 8) | port1,
			USB_PORT_FEAT_INDICATOR);
	if (status < 0)
		dev_dbg (hub->intfdev,
			"port %d indicator %s status %d\n",
			port1,
			({ char *s; switch (selector) {
			case HUB_LED_AMBER: s = "amber"; break;
			case HUB_LED_GREEN: s = "green"; break;
			case HUB_LED_OFF: s = "off"; break;
			case HUB_LED_AUTO: s = "auto"; break;
			default: s = "??"; break;
			}; s; }),
			status);
}

#define	LED_CYCLE_PERIOD	((2*HZ)/3)

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static void led_work (struct work_struct *work)
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{
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	struct usb_hub		*hub =
		container_of(work, struct usb_hub, leds.work);
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	struct usb_device	*hdev = hub->hdev;
	unsigned		i;
	unsigned		changed = 0;
	int			cursor = -1;

	if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
		return;

	for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
		unsigned	selector, mode;

		/* 30%-50% duty cycle */

		switch (hub->indicator[i]) {
		/* cycle marker */
		case INDICATOR_CYCLE:
			cursor = i;
			selector = HUB_LED_AUTO;
			mode = INDICATOR_AUTO;
			break;
		/* blinking green = sw attention */
		case INDICATOR_GREEN_BLINK:
			selector = HUB_LED_GREEN;
			mode = INDICATOR_GREEN_BLINK_OFF;
			break;
		case INDICATOR_GREEN_BLINK_OFF:
			selector = HUB_LED_OFF;
			mode = INDICATOR_GREEN_BLINK;
			break;
		/* blinking amber = hw attention */
		case INDICATOR_AMBER_BLINK:
			selector = HUB_LED_AMBER;
			mode = INDICATOR_AMBER_BLINK_OFF;
			break;
		case INDICATOR_AMBER_BLINK_OFF:
			selector = HUB_LED_OFF;
			mode = INDICATOR_AMBER_BLINK;
			break;
		/* blink green/amber = reserved */
		case INDICATOR_ALT_BLINK:
			selector = HUB_LED_GREEN;
			mode = INDICATOR_ALT_BLINK_OFF;
			break;
		case INDICATOR_ALT_BLINK_OFF:
			selector = HUB_LED_AMBER;
			mode = INDICATOR_ALT_BLINK;
			break;
		default:
			continue;
		}
		if (selector != HUB_LED_AUTO)
			changed = 1;
		set_port_led(hub, i + 1, selector);
		hub->indicator[i] = mode;
	}
	if (!changed && blinkenlights) {
		cursor++;
		cursor %= hub->descriptor->bNbrPorts;
		set_port_led(hub, cursor + 1, HUB_LED_GREEN);
		hub->indicator[cursor] = INDICATOR_CYCLE;
		changed++;
	}
	if (changed)
		schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
}

/* use a short timeout for hub/port status fetches */
#define	USB_STS_TIMEOUT		1000
#define	USB_STS_RETRIES		5

/*
 * USB 2.0 spec Section 11.24.2.6
 */
static int get_hub_status(struct usb_device *hdev,
		struct usb_hub_status *data)
{
	int i, status = -ETIMEDOUT;

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	for (i = 0; i < USB_STS_RETRIES &&
			(status == -ETIMEDOUT || status == -EPIPE); i++) {
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		status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
			USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
			data, sizeof(*data), USB_STS_TIMEOUT);
	}
	return status;
}

/*
 * USB 2.0 spec Section 11.24.2.7
 */
static int get_port_status(struct usb_device *hdev, int port1,
		struct usb_port_status *data)
{
	int i, status = -ETIMEDOUT;

594 595
	for (i = 0; i < USB_STS_RETRIES &&
			(status == -ETIMEDOUT || status == -EPIPE); i++) {
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		status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
			USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
			data, sizeof(*data), USB_STS_TIMEOUT);
	}
	return status;
}

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static int hub_port_status(struct usb_hub *hub, int port1,
		u16 *status, u16 *change)
{
	int ret;

	mutex_lock(&hub->status_mutex);
	ret = get_port_status(hub->hdev, port1, &hub->status->port);
	if (ret < 4) {
		dev_err(hub->intfdev,
			"%s failed (err = %d)\n", __func__, ret);
		if (ret >= 0)
			ret = -EIO;
	} else {
		*status = le16_to_cpu(hub->status->port.wPortStatus);
		*change = le16_to_cpu(hub->status->port.wPortChange);
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		ret = 0;
	}
	mutex_unlock(&hub->status_mutex);
	return ret;
}

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static void kick_khubd(struct usb_hub *hub)
{
	unsigned long	flags;

	spin_lock_irqsave(&hub_event_lock, flags);
630
	if (!hub->disconnected && list_empty(&hub->event_list)) {
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		list_add_tail(&hub->event_list, &hub_event_list);
632 633 634 635

		/* Suppress autosuspend until khubd runs */
		usb_autopm_get_interface_no_resume(
				to_usb_interface(hub->intfdev));
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		wake_up(&khubd_wait);
	}
	spin_unlock_irqrestore(&hub_event_lock, flags);
}

void usb_kick_khubd(struct usb_device *hdev)
{
643 644 645 646
	struct usb_hub *hub = hdev_to_hub(hdev);

	if (hub)
		kick_khubd(hub);
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}

649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671
/*
 * Let the USB core know that a USB 3.0 device has sent a Function Wake Device
 * Notification, which indicates it had initiated remote wakeup.
 *
 * USB 3.0 hubs do not report the port link state change from U3 to U0 when the
 * device initiates resume, so the USB core will not receive notice of the
 * resume through the normal hub interrupt URB.
 */
void usb_wakeup_notification(struct usb_device *hdev,
		unsigned int portnum)
{
	struct usb_hub *hub;

	if (!hdev)
		return;

	hub = hdev_to_hub(hdev);
	if (hub) {
		set_bit(portnum, hub->wakeup_bits);
		kick_khubd(hub);
	}
}
EXPORT_SYMBOL_GPL(usb_wakeup_notification);
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/* completion function, fires on port status changes and various faults */
674
static void hub_irq(struct urb *urb)
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{
676
	struct usb_hub *hub = urb->context;
677
	int status = urb->status;
678
	unsigned i;
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	unsigned long bits;

681
	switch (status) {
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	case -ENOENT:		/* synchronous unlink */
	case -ECONNRESET:	/* async unlink */
	case -ESHUTDOWN:	/* hardware going away */
		return;

	default:		/* presumably an error */
		/* Cause a hub reset after 10 consecutive errors */
689
		dev_dbg (hub->intfdev, "transfer --> %d\n", status);
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		if ((++hub->nerrors < 10) || hub->error)
			goto resubmit;
692
		hub->error = status;
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		/* FALL THROUGH */
694

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	/* let khubd handle things */
	case 0:			/* we got data:  port status changed */
		bits = 0;
		for (i = 0; i < urb->actual_length; ++i)
			bits |= ((unsigned long) ((*hub->buffer)[i]))
					<< (i*8);
		hub->event_bits[0] = bits;
		break;
	}

	hub->nerrors = 0;

	/* Something happened, let khubd figure it out */
	kick_khubd(hub);

resubmit:
	if (hub->quiescing)
		return;

	if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
			&& status != -ENODEV && status != -EPERM)
		dev_err (hub->intfdev, "resubmit --> %d\n", status);
}

/* USB 2.0 spec Section 11.24.2.3 */
static inline int
hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
{
723
	return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
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			       HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
			       tt, NULL, 0, 1000);
}

/*
 * enumeration blocks khubd for a long time. we use keventd instead, since
 * long blocking there is the exception, not the rule.  accordingly, HCDs
 * talking to TTs must queue control transfers (not just bulk and iso), so
 * both can talk to the same hub concurrently.
 */
734
static void hub_tt_work(struct work_struct *work)
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{
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	struct usb_hub		*hub =
737
		container_of(work, struct usb_hub, tt.clear_work);
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	unsigned long		flags;
739
	int			limit = 100;
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	spin_lock_irqsave (&hub->tt.lock, flags);
742
	while (--limit && !list_empty (&hub->tt.clear_list)) {
743
		struct list_head	*next;
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		struct usb_tt_clear	*clear;
		struct usb_device	*hdev = hub->hdev;
746
		const struct hc_driver	*drv;
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		int			status;

749 750
		next = hub->tt.clear_list.next;
		clear = list_entry (next, struct usb_tt_clear, clear_list);
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		list_del (&clear->clear_list);

		/* drop lock so HCD can concurrently report other TT errors */
		spin_unlock_irqrestore (&hub->tt.lock, flags);
		status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
		if (status)
			dev_err (&hdev->dev,
				"clear tt %d (%04x) error %d\n",
				clear->tt, clear->devinfo, status);
760 761 762 763 764 765

		/* Tell the HCD, even if the operation failed */
		drv = clear->hcd->driver;
		if (drv->clear_tt_buffer_complete)
			(drv->clear_tt_buffer_complete)(clear->hcd, clear->ep);

766
		kfree(clear);
767
		spin_lock_irqsave(&hub->tt.lock, flags);
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	}
	spin_unlock_irqrestore (&hub->tt.lock, flags);
}

/**
773 774
 * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
 * @urb: an URB associated with the failed or incomplete split transaction
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 *
 * High speed HCDs use this to tell the hub driver that some split control or
 * bulk transaction failed in a way that requires clearing internal state of
 * a transaction translator.  This is normally detected (and reported) from
 * interrupt context.
 *
 * It may not be possible for that hub to handle additional full (or low)
 * speed transactions until that state is fully cleared out.
 */
784
int usb_hub_clear_tt_buffer(struct urb *urb)
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{
786 787
	struct usb_device	*udev = urb->dev;
	int			pipe = urb->pipe;
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	struct usb_tt		*tt = udev->tt;
	unsigned long		flags;
	struct usb_tt_clear	*clear;

	/* we've got to cope with an arbitrary number of pending TT clears,
	 * since each TT has "at least two" buffers that can need it (and
	 * there can be many TTs per hub).  even if they're uncommon.
	 */
796
	if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
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		dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
		/* FIXME recover somehow ... RESET_TT? */
799
		return -ENOMEM;
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	}

	/* info that CLEAR_TT_BUFFER needs */
	clear->tt = tt->multi ? udev->ttport : 1;
	clear->devinfo = usb_pipeendpoint (pipe);
	clear->devinfo |= udev->devnum << 4;
	clear->devinfo |= usb_pipecontrol (pipe)
			? (USB_ENDPOINT_XFER_CONTROL << 11)
			: (USB_ENDPOINT_XFER_BULK << 11);
	if (usb_pipein (pipe))
		clear->devinfo |= 1 << 15;
811 812 813 814 815

	/* info for completion callback */
	clear->hcd = bus_to_hcd(udev->bus);
	clear->ep = urb->ep;

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	/* tell keventd to clear state for this TT */
	spin_lock_irqsave (&tt->lock, flags);
	list_add_tail (&clear->clear_list, &tt->clear_list);
819
	schedule_work(&tt->clear_work);
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	spin_unlock_irqrestore (&tt->lock, flags);
821
	return 0;
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}
823
EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer);
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824

825 826 827 828
/* If do_delay is false, return the number of milliseconds the caller
 * needs to delay.
 */
static unsigned hub_power_on(struct usb_hub *hub, bool do_delay)
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{
	int port1;
831
	unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
832
	unsigned delay;
833 834 835 836 837 838 839 840 841 842
	u16 wHubCharacteristics =
			le16_to_cpu(hub->descriptor->wHubCharacteristics);

	/* Enable power on each port.  Some hubs have reserved values
	 * of LPSM (> 2) in their descriptors, even though they are
	 * USB 2.0 hubs.  Some hubs do not implement port-power switching
	 * but only emulate it.  In all cases, the ports won't work
	 * unless we send these messages to the hub.
	 */
	if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
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		dev_dbg(hub->intfdev, "enabling power on all ports\n");
844 845 846 847
	else
		dev_dbg(hub->intfdev, "trying to enable port power on "
				"non-switchable hub\n");
	for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
848
		set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
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850
	/* Wait at least 100 msec for power to become stable */
851 852 853 854
	delay = max(pgood_delay, (unsigned) 100);
	if (do_delay)
		msleep(delay);
	return delay;
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}

static int hub_hub_status(struct usb_hub *hub,
		u16 *status, u16 *change)
{
	int ret;

862
	mutex_lock(&hub->status_mutex);
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	ret = get_hub_status(hub->hdev, &hub->status->hub);
	if (ret < 0)
		dev_err (hub->intfdev,
866
			"%s failed (err = %d)\n", __func__, ret);
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	else {
		*status = le16_to_cpu(hub->status->hub.wHubStatus);
		*change = le16_to_cpu(hub->status->hub.wHubChange); 
		ret = 0;
	}
872
	mutex_unlock(&hub->status_mutex);
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	return ret;
}

876 877 878
static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
{
	struct usb_device *hdev = hub->hdev;
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	int ret = 0;
880

881 882
	if (hub->ports[port1 - 1]->child && set_state)
		usb_set_device_state(hub->ports[port1 - 1]->child,
883
				USB_STATE_NOTATTACHED);
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	if (!hub->error && !hub_is_superspeed(hub->hdev))
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		ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
886 887
	if (ret)
		dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
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				port1, ret);
889 890 891
	return ret;
}

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/*
893
 * Disable a port and mark a logical connect-change event, so that some
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 * time later khubd will disconnect() any existing usb_device on the port
 * and will re-enumerate if there actually is a device attached.
 */
static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
{
	dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
	hub_port_disable(hub, port1, 1);
901

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	/* FIXME let caller ask to power down the port:
	 *  - some devices won't enumerate without a VBUS power cycle
	 *  - SRP saves power that way
	 *  - ... new call, TBD ...
	 * That's easy if this hub can switch power per-port, and
	 * khubd reactivates the port later (timer, SRP, etc).
	 * Powerdown must be optional, because of reset/DFU.
	 */

	set_bit(port1, hub->change_bits);
 	kick_khubd(hub);
}

915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941
/**
 * usb_remove_device - disable a device's port on its parent hub
 * @udev: device to be disabled and removed
 * Context: @udev locked, must be able to sleep.
 *
 * After @udev's port has been disabled, khubd is notified and it will
 * see that the device has been disconnected.  When the device is
 * physically unplugged and something is plugged in, the events will
 * be received and processed normally.
 */
int usb_remove_device(struct usb_device *udev)
{
	struct usb_hub *hub;
	struct usb_interface *intf;

	if (!udev->parent)	/* Can't remove a root hub */
		return -EINVAL;
	hub = hdev_to_hub(udev->parent);
	intf = to_usb_interface(hub->intfdev);

	usb_autopm_get_interface(intf);
	set_bit(udev->portnum, hub->removed_bits);
	hub_port_logical_disconnect(hub, udev->portnum);
	usb_autopm_put_interface(intf);
	return 0;
}

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enum hub_activation_type {
943
	HUB_INIT, HUB_INIT2, HUB_INIT3,		/* INITs must come first */
944
	HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME,
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};
946

947 948 949
static void hub_init_func2(struct work_struct *ws);
static void hub_init_func3(struct work_struct *ws);

950
static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
951 952
{
	struct usb_device *hdev = hub->hdev;
953 954
	struct usb_hcd *hcd;
	int ret;
955
	int port1;
956
	int status;
957
	bool need_debounce_delay = false;
958 959 960 961 962 963 964
	unsigned delay;

	/* Continue a partial initialization */
	if (type == HUB_INIT2)
		goto init2;
	if (type == HUB_INIT3)
		goto init3;
965

966 967 968 969 970 971 972 973
	/* The superspeed hub except for root hub has to use Hub Depth
	 * value as an offset into the route string to locate the bits
	 * it uses to determine the downstream port number. So hub driver
	 * should send a set hub depth request to superspeed hub after
	 * the superspeed hub is set configuration in initialization or
	 * reset procedure.
	 *
	 * After a resume, port power should still be on.
974 975
	 * For any other type of activation, turn it on.
	 */
976
	if (type != HUB_RESUME) {
977 978 979 980 981 982 983 984 985
		if (hdev->parent && hub_is_superspeed(hdev)) {
			ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
					HUB_SET_DEPTH, USB_RT_HUB,
					hdev->level - 1, 0, NULL, 0,
					USB_CTRL_SET_TIMEOUT);
			if (ret < 0)
				dev_err(hub->intfdev,
						"set hub depth failed\n");
		}
986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003

		/* Speed up system boot by using a delayed_work for the
		 * hub's initial power-up delays.  This is pretty awkward
		 * and the implementation looks like a home-brewed sort of
		 * setjmp/longjmp, but it saves at least 100 ms for each
		 * root hub (assuming usbcore is compiled into the kernel
		 * rather than as a module).  It adds up.
		 *
		 * This can't be done for HUB_RESUME or HUB_RESET_RESUME
		 * because for those activation types the ports have to be
		 * operational when we return.  In theory this could be done
		 * for HUB_POST_RESET, but it's easier not to.
		 */
		if (type == HUB_INIT) {
			delay = hub_power_on(hub, false);
			PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2);
			schedule_delayed_work(&hub->init_work,
					msecs_to_jiffies(delay));
1004 1005

			/* Suppress autosuspend until init is done */
1006 1007
			usb_autopm_get_interface_no_resume(
					to_usb_interface(hub->intfdev));
1008
			return;		/* Continues at init2: below */
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027
		} else if (type == HUB_RESET_RESUME) {
			/* The internal host controller state for the hub device
			 * may be gone after a host power loss on system resume.
			 * Update the device's info so the HW knows it's a hub.
			 */
			hcd = bus_to_hcd(hdev->bus);
			if (hcd->driver->update_hub_device) {
				ret = hcd->driver->update_hub_device(hcd, hdev,
						&hub->tt, GFP_NOIO);
				if (ret < 0) {
					dev_err(hub->intfdev, "Host not "
							"accepting hub info "
							"update.\n");
					dev_err(hub->intfdev, "LS/FS devices "
							"and hubs may not work "
							"under this hub\n.");
				}
			}
			hub_power_on(hub, true);
1028 1029 1030 1031 1032
		} else {
			hub_power_on(hub, true);
		}
	}
 init2:
1033

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Alan Stern 已提交
1034 1035
	/* Check each port and set hub->change_bits to let khubd know
	 * which ports need attention.
1036 1037
	 */
	for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
1038
		struct usb_device *udev = hub->ports[port1 - 1]->child;
1039 1040
		u16 portstatus, portchange;

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1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057
		portstatus = portchange = 0;
		status = hub_port_status(hub, port1, &portstatus, &portchange);
		if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
			dev_dbg(hub->intfdev,
					"port %d: status %04x change %04x\n",
					port1, portstatus, portchange);

		/* After anything other than HUB_RESUME (i.e., initialization
		 * or any sort of reset), every port should be disabled.
		 * Unconnected ports should likewise be disabled (paranoia),
		 * and so should ports for which we have no usb_device.
		 */
		if ((portstatus & USB_PORT_STAT_ENABLE) && (
				type != HUB_RESUME ||
				!(portstatus & USB_PORT_STAT_CONNECTION) ||
				!udev ||
				udev->state == USB_STATE_NOTATTACHED)) {
1058 1059 1060 1061 1062
			/*
			 * USB3 protocol ports will automatically transition
			 * to Enabled state when detect an USB3.0 device attach.
			 * Do not disable USB3 protocol ports.
			 */
1063
			if (!hub_is_superspeed(hdev)) {
1064 1065 1066
				clear_port_feature(hdev, port1,
						   USB_PORT_FEAT_ENABLE);
				portstatus &= ~USB_PORT_STAT_ENABLE;
1067 1068 1069
			} else {
				/* Pretend that power was lost for USB3 devs */
				portstatus &= ~USB_PORT_STAT_ENABLE;
1070
			}
1071 1072
		}

1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083
		/* Clear status-change flags; we'll debounce later */
		if (portchange & USB_PORT_STAT_C_CONNECTION) {
			need_debounce_delay = true;
			clear_port_feature(hub->hdev, port1,
					USB_PORT_FEAT_C_CONNECTION);
		}
		if (portchange & USB_PORT_STAT_C_ENABLE) {
			need_debounce_delay = true;
			clear_port_feature(hub->hdev, port1,
					USB_PORT_FEAT_C_ENABLE);
		}
1084 1085 1086 1087 1088 1089
		if ((portchange & USB_PORT_STAT_C_BH_RESET) &&
				hub_is_superspeed(hub->hdev)) {
			need_debounce_delay = true;
			clear_port_feature(hub->hdev, port1,
					USB_PORT_FEAT_C_BH_PORT_RESET);
		}
1090 1091 1092 1093 1094 1095 1096
		/* We can forget about a "removed" device when there's a
		 * physical disconnect or the connect status changes.
		 */
		if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
				(portchange & USB_PORT_STAT_C_CONNECTION))
			clear_bit(port1, hub->removed_bits);

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1097 1098 1099 1100 1101 1102 1103 1104
		if (!udev || udev->state == USB_STATE_NOTATTACHED) {
			/* Tell khubd to disconnect the device or
			 * check for a new connection
			 */
			if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
				set_bit(port1, hub->change_bits);

		} else if (portstatus & USB_PORT_STAT_ENABLE) {
1105 1106 1107
			bool port_resumed = (portstatus &
					USB_PORT_STAT_LINK_STATE) ==
				USB_SS_PORT_LS_U0;
A
Alan Stern 已提交
1108 1109 1110
			/* The power session apparently survived the resume.
			 * If there was an overcurrent or suspend change
			 * (i.e., remote wakeup request), have khubd
1111 1112 1113 1114
			 * take care of it.  Look at the port link state
			 * for USB 3.0 hubs, since they don't have a suspend
			 * change bit, and they don't set the port link change
			 * bit on device-initiated resume.
A
Alan Stern 已提交
1115
			 */
1116 1117
			if (portchange || (hub_is_superspeed(hub->hdev) &&
						port_resumed))
A
Alan Stern 已提交
1118
				set_bit(port1, hub->change_bits);
1119

A
Alan Stern 已提交
1120 1121
		} else if (udev->persist_enabled) {
#ifdef CONFIG_PM
1122
			udev->reset_resume = 1;
A
Alan Stern 已提交
1123
#endif
1124 1125
			set_bit(port1, hub->change_bits);

A
Alan Stern 已提交
1126 1127 1128 1129
		} else {
			/* The power session is gone; tell khubd */
			usb_set_device_state(udev, USB_STATE_NOTATTACHED);
			set_bit(port1, hub->change_bits);
1130 1131 1132
		}
	}

1133 1134 1135 1136 1137 1138 1139 1140
	/* If no port-status-change flags were set, we don't need any
	 * debouncing.  If flags were set we can try to debounce the
	 * ports all at once right now, instead of letting khubd do them
	 * one at a time later on.
	 *
	 * If any port-status changes do occur during this delay, khubd
	 * will see them later and handle them normally.
	 */
1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
	if (need_debounce_delay) {
		delay = HUB_DEBOUNCE_STABLE;

		/* Don't do a long sleep inside a workqueue routine */
		if (type == HUB_INIT2) {
			PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3);
			schedule_delayed_work(&hub->init_work,
					msecs_to_jiffies(delay));
			return;		/* Continues at init3: below */
		} else {
			msleep(delay);
		}
	}
 init3:
1155 1156 1157 1158 1159 1160 1161 1162 1163 1164
	hub->quiescing = 0;

	status = usb_submit_urb(hub->urb, GFP_NOIO);
	if (status < 0)
		dev_err(hub->intfdev, "activate --> %d\n", status);
	if (hub->has_indicators && blinkenlights)
		schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);

	/* Scan all ports that need attention */
	kick_khubd(hub);
1165 1166 1167 1168

	/* Allow autosuspend if it was suppressed */
	if (type <= HUB_INIT3)
		usb_autopm_put_interface_async(to_usb_interface(hub->intfdev));
1169 1170
}

1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185
/* Implement the continuations for the delays above */
static void hub_init_func2(struct work_struct *ws)
{
	struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);

	hub_activate(hub, HUB_INIT2);
}

static void hub_init_func3(struct work_struct *ws)
{
	struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);

	hub_activate(hub, HUB_INIT3);
}

1186 1187 1188 1189 1190 1191 1192 1193 1194
enum hub_quiescing_type {
	HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND
};

static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
{
	struct usb_device *hdev = hub->hdev;
	int i;

1195 1196
	cancel_delayed_work_sync(&hub->init_work);

1197 1198 1199 1200 1201 1202
	/* khubd and related activity won't re-trigger */
	hub->quiescing = 1;

	if (type != HUB_SUSPEND) {
		/* Disconnect all the children */
		for (i = 0; i < hdev->maxchild; ++i) {
1203 1204
			if (hub->ports[i]->child)
				usb_disconnect(&hub->ports[i]->child);
1205 1206 1207 1208 1209 1210 1211 1212
		}
	}

	/* Stop khubd and related activity */
	usb_kill_urb(hub->urb);
	if (hub->has_indicators)
		cancel_delayed_work_sync(&hub->leds);
	if (hub->tt.hub)
1213
		cancel_work_sync(&hub->tt.clear_work);
1214 1215
}

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1216 1217 1218 1219 1220
/* caller has locked the hub device */
static int hub_pre_reset(struct usb_interface *intf)
{
	struct usb_hub *hub = usb_get_intfdata(intf);

1221
	hub_quiesce(hub, HUB_PRE_RESET);
A
Alan Stern 已提交
1222
	return 0;
1223 1224 1225
}

/* caller has locked the hub device */
A
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1226
static int hub_post_reset(struct usb_interface *intf)
1227
{
1228 1229
	struct usb_hub *hub = usb_get_intfdata(intf);

1230
	hub_activate(hub, HUB_POST_RESET);
A
Alan Stern 已提交
1231
	return 0;
1232 1233
}

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1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279
static void usb_port_device_release(struct device *dev)
{
	struct usb_port *port_dev = to_usb_port(dev);

	kfree(port_dev);
}

static void usb_hub_remove_port_device(struct usb_hub *hub,
				       int port1)
{
	device_unregister(&hub->ports[port1 - 1]->dev);
}

struct device_type usb_port_device_type = {
	.name =		"usb_port",
	.release =	usb_port_device_release,
};

static int usb_hub_create_port_device(struct usb_hub *hub,
				      int port1)
{
	struct usb_port *port_dev = NULL;
	int retval;

	port_dev = kzalloc(sizeof(*port_dev), GFP_KERNEL);
	if (!port_dev) {
		retval = -ENOMEM;
		goto exit;
	}

	hub->ports[port1 - 1] = port_dev;
	port_dev->dev.parent = hub->intfdev;
	port_dev->dev.type = &usb_port_device_type;
	dev_set_name(&port_dev->dev, "port%d", port1);

	retval = device_register(&port_dev->dev);
	if (retval)
		goto error_register;
	return 0;

error_register:
	put_device(&port_dev->dev);
exit:
	return retval;
}

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1280 1281 1282
static int hub_configure(struct usb_hub *hub,
	struct usb_endpoint_descriptor *endpoint)
{
1283
	struct usb_hcd *hcd;
L
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1284 1285 1286
	struct usb_device *hdev = hub->hdev;
	struct device *hub_dev = hub->intfdev;
	u16 hubstatus, hubchange;
1287
	u16 wHubCharacteristics;
L
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1288
	unsigned int pipe;
L
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1289
	int maxp, ret, i;
1290
	char *message = "out of memory";
L
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1291

1292
	hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL);
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	if (!hub->buffer) {
		ret = -ENOMEM;
		goto fail;
	}

	hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
	if (!hub->status) {
		ret = -ENOMEM;
		goto fail;
	}
1303
	mutex_init(&hub->status_mutex);
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1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314

	hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
	if (!hub->descriptor) {
		ret = -ENOMEM;
		goto fail;
	}

	/* Request the entire hub descriptor.
	 * hub->descriptor can handle USB_MAXCHILDREN ports,
	 * but the hub can/will return fewer bytes here.
	 */
J
John Youn 已提交
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	ret = get_hub_descriptor(hdev, hub->descriptor);
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1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328
	if (ret < 0) {
		message = "can't read hub descriptor";
		goto fail;
	} else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
		message = "hub has too many ports!";
		ret = -ENODEV;
		goto fail;
	}

	hdev->maxchild = hub->descriptor->bNbrPorts;
	dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
		(hdev->maxchild == 1) ? "" : "s");

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	hub->ports = kzalloc(hdev->maxchild * sizeof(struct usb_port *),
			     GFP_KERNEL);
1331
	if (!hub->ports) {
1332 1333 1334 1335
		ret = -ENOMEM;
		goto fail;
	}

1336
	wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
L
Linus Torvalds 已提交
1337

J
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1338 1339 1340
	/* FIXME for USB 3.0, skip for now */
	if ((wHubCharacteristics & HUB_CHAR_COMPOUND) &&
			!(hub_is_superspeed(hdev))) {
L
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		int	i;
		char	portstr [USB_MAXCHILDREN + 1];

		for (i = 0; i < hdev->maxchild; i++)
J
John Youn 已提交
1345
			portstr[i] = hub->descriptor->u.hs.DeviceRemovable
L
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1346 1347 1348 1349 1350 1351 1352
				    [((i + 1) / 8)] & (1 << ((i + 1) % 8))
				? 'F' : 'R';
		portstr[hdev->maxchild] = 0;
		dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
	} else
		dev_dbg(hub_dev, "standalone hub\n");

1353
	switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1354 1355 1356 1357 1358 1359 1360 1361 1362 1363
	case HUB_CHAR_COMMON_LPSM:
		dev_dbg(hub_dev, "ganged power switching\n");
		break;
	case HUB_CHAR_INDV_PORT_LPSM:
		dev_dbg(hub_dev, "individual port power switching\n");
		break;
	case HUB_CHAR_NO_LPSM:
	case HUB_CHAR_LPSM:
		dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
		break;
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	}

1366
	switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1367 1368 1369 1370 1371 1372 1373 1374 1375 1376
	case HUB_CHAR_COMMON_OCPM:
		dev_dbg(hub_dev, "global over-current protection\n");
		break;
	case HUB_CHAR_INDV_PORT_OCPM:
		dev_dbg(hub_dev, "individual port over-current protection\n");
		break;
	case HUB_CHAR_NO_OCPM:
	case HUB_CHAR_OCPM:
		dev_dbg(hub_dev, "no over-current protection\n");
		break;
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	}

	spin_lock_init (&hub->tt.lock);
	INIT_LIST_HEAD (&hub->tt.clear_list);
1381
	INIT_WORK(&hub->tt.clear_work, hub_tt_work);
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	switch (hdev->descriptor.bDeviceProtocol) {
1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405
	case USB_HUB_PR_FS:
		break;
	case USB_HUB_PR_HS_SINGLE_TT:
		dev_dbg(hub_dev, "Single TT\n");
		hub->tt.hub = hdev;
		break;
	case USB_HUB_PR_HS_MULTI_TT:
		ret = usb_set_interface(hdev, 0, 1);
		if (ret == 0) {
			dev_dbg(hub_dev, "TT per port\n");
			hub->tt.multi = 1;
		} else
			dev_err(hub_dev, "Using single TT (err %d)\n",
				ret);
		hub->tt.hub = hdev;
		break;
	case USB_HUB_PR_SS:
		/* USB 3.0 hubs don't have a TT */
		break;
	default:
		dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
			hdev->descriptor.bDeviceProtocol);
		break;
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1406 1407
	}

1408
	/* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
1409
	switch (wHubCharacteristics & HUB_CHAR_TTTT) {
1410 1411 1412 1413 1414 1415 1416
		case HUB_TTTT_8_BITS:
			if (hdev->descriptor.bDeviceProtocol != 0) {
				hub->tt.think_time = 666;
				dev_dbg(hub_dev, "TT requires at most %d "
						"FS bit times (%d ns)\n",
					8, hub->tt.think_time);
			}
L
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1417
			break;
1418 1419 1420 1421 1422
		case HUB_TTTT_16_BITS:
			hub->tt.think_time = 666 * 2;
			dev_dbg(hub_dev, "TT requires at most %d "
					"FS bit times (%d ns)\n",
				16, hub->tt.think_time);
L
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1423
			break;
1424 1425 1426 1427 1428
		case HUB_TTTT_24_BITS:
			hub->tt.think_time = 666 * 3;
			dev_dbg(hub_dev, "TT requires at most %d "
					"FS bit times (%d ns)\n",
				24, hub->tt.think_time);
L
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1429
			break;
1430 1431 1432 1433 1434
		case HUB_TTTT_32_BITS:
			hub->tt.think_time = 666 * 4;
			dev_dbg(hub_dev, "TT requires at most %d "
					"FS bit times (%d ns)\n",
				32, hub->tt.think_time);
L
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1435 1436 1437 1438
			break;
	}

	/* probe() zeroes hub->indicator[] */
1439
	if (wHubCharacteristics & HUB_CHAR_PORTIND) {
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1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450
		hub->has_indicators = 1;
		dev_dbg(hub_dev, "Port indicators are supported\n");
	}

	dev_dbg(hub_dev, "power on to power good time: %dms\n",
		hub->descriptor->bPwrOn2PwrGood * 2);

	/* power budgeting mostly matters with bus-powered hubs,
	 * and battery-powered root hubs (may provide just 8 mA).
	 */
	ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
1451
	if (ret < 2) {
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1452 1453 1454
		message = "can't get hub status";
		goto fail;
	}
1455 1456
	le16_to_cpus(&hubstatus);
	if (hdev == hdev->bus->root_hub) {
1457 1458 1459 1460 1461 1462
		if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
			hub->mA_per_port = 500;
		else {
			hub->mA_per_port = hdev->bus_mA;
			hub->limited_power = 1;
		}
1463
	} else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
L
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1464 1465
		dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
			hub->descriptor->bHubContrCurrent);
1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480
		hub->limited_power = 1;
		if (hdev->maxchild > 0) {
			int remaining = hdev->bus_mA -
					hub->descriptor->bHubContrCurrent;

			if (remaining < hdev->maxchild * 100)
				dev_warn(hub_dev,
					"insufficient power available "
					"to use all downstream ports\n");
			hub->mA_per_port = 100;		/* 7.2.1.1 */
		}
	} else {	/* Self-powered external hub */
		/* FIXME: What about battery-powered external hubs that
		 * provide less current per port? */
		hub->mA_per_port = 500;
1481
	}
1482 1483 1484
	if (hub->mA_per_port < 500)
		dev_dbg(hub_dev, "%umA bus power budget for each child\n",
				hub->mA_per_port);
L
Linus Torvalds 已提交
1485

1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498
	/* Update the HCD's internal representation of this hub before khubd
	 * starts getting port status changes for devices under the hub.
	 */
	hcd = bus_to_hcd(hdev->bus);
	if (hcd->driver->update_hub_device) {
		ret = hcd->driver->update_hub_device(hcd, hdev,
				&hub->tt, GFP_KERNEL);
		if (ret < 0) {
			message = "can't update HCD hub info";
			goto fail;
		}
	}

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1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510
	ret = hub_hub_status(hub, &hubstatus, &hubchange);
	if (ret < 0) {
		message = "can't get hub status";
		goto fail;
	}

	/* local power status reports aren't always correct */
	if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
		dev_dbg(hub_dev, "local power source is %s\n",
			(hubstatus & HUB_STATUS_LOCAL_POWER)
			? "lost (inactive)" : "good");

1511
	if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
L
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1512 1513 1514
		dev_dbg(hub_dev, "%sover-current condition exists\n",
			(hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");

1515 1516 1517 1518 1519 1520
	/* set up the interrupt endpoint
	 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
	 * bytes as USB2.0[11.12.3] says because some hubs are known
	 * to send more data (and thus cause overflow). For root hubs,
	 * maxpktsize is defined in hcd.c's fake endpoint descriptors
	 * to be big enough for at least USB_MAXCHILDREN ports. */
L
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1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539
	pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
	maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));

	if (maxp > sizeof(*hub->buffer))
		maxp = sizeof(*hub->buffer);

	hub->urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!hub->urb) {
		ret = -ENOMEM;
		goto fail;
	}

	usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
		hub, endpoint->bInterval);

	/* maybe cycle the hub leds */
	if (hub->has_indicators && blinkenlights)
		hub->indicator [0] = INDICATOR_CYCLE;

L
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1540 1541 1542 1543 1544
	for (i = 0; i < hdev->maxchild; i++)
		if (usb_hub_create_port_device(hub, i + 1) < 0)
			dev_err(hub->intfdev,
				"couldn't create port%d device.\n", i + 1);

1545
	hub_activate(hub, HUB_INIT);
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1546 1547 1548 1549 1550 1551 1552 1553 1554
	return 0;

fail:
	dev_err (hub_dev, "config failed, %s (err %d)\n",
			message, ret);
	/* hub_disconnect() frees urb and descriptor */
	return ret;
}

1555 1556 1557 1558 1559 1560 1561 1562
static void hub_release(struct kref *kref)
{
	struct usb_hub *hub = container_of(kref, struct usb_hub, kref);

	usb_put_intf(to_usb_interface(hub->intfdev));
	kfree(hub);
}

L
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1563 1564 1565 1566
static unsigned highspeed_hubs;

static void hub_disconnect(struct usb_interface *intf)
{
1567
	struct usb_hub *hub = usb_get_intfdata(intf);
1568
	struct usb_device *hdev = interface_to_usbdev(intf);
L
Lan Tianyu 已提交
1569 1570
	int i;

1571 1572
	/* Take the hub off the event list and don't let it be added again */
	spin_lock_irq(&hub_event_lock);
1573 1574 1575 1576
	if (!list_empty(&hub->event_list)) {
		list_del_init(&hub->event_list);
		usb_autopm_put_interface_no_suspend(intf);
	}
1577 1578
	hub->disconnected = 1;
	spin_unlock_irq(&hub_event_lock);
L
Linus Torvalds 已提交
1579

1580 1581
	/* Disconnect all children and quiesce the hub */
	hub->error = 0;
1582
	hub_quiesce(hub, HUB_DISCONNECT);
1583

1584
	usb_set_intfdata (intf, NULL);
1585 1586 1587

	for (i = 0; i < hdev->maxchild; i++)
		usb_hub_remove_port_device(hub, i + 1);
1588
	hub->hdev->maxchild = 0;
L
Linus Torvalds 已提交
1589

1590
	if (hub->hdev->speed == USB_SPEED_HIGH)
L
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1591 1592 1593
		highspeed_hubs--;

	usb_free_urb(hub->urb);
L
Lan Tianyu 已提交
1594
	kfree(hub->ports);
1595 1596
	kfree(hub->descriptor);
	kfree(hub->status);
1597
	kfree(hub->buffer);
L
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1598

1599
	kref_put(&hub->kref, hub_release);
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1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611
}

static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	struct usb_host_interface *desc;
	struct usb_endpoint_descriptor *endpoint;
	struct usb_device *hdev;
	struct usb_hub *hub;

	desc = intf->cur_altsetting;
	hdev = interface_to_usbdev(intf);

1612 1613
	/* Hubs have proper suspend/resume support. */
	usb_enable_autosuspend(hdev);
1614

1615
	if (hdev->level == MAX_TOPO_LEVEL) {
1616 1617
		dev_err(&intf->dev,
			"Unsupported bus topology: hub nested too deep\n");
1618 1619 1620
		return -E2BIG;
	}

1621 1622 1623 1624 1625 1626 1627
#ifdef	CONFIG_USB_OTG_BLACKLIST_HUB
	if (hdev->parent) {
		dev_warn(&intf->dev, "ignoring external hub\n");
		return -ENODEV;
	}
#endif

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1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642
	/* Some hubs have a subclass of 1, which AFAICT according to the */
	/*  specs is not defined, but it works */
	if ((desc->desc.bInterfaceSubClass != 0) &&
	    (desc->desc.bInterfaceSubClass != 1)) {
descriptor_error:
		dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
		return -EIO;
	}

	/* Multiple endpoints? What kind of mutant ninja-hub is this? */
	if (desc->desc.bNumEndpoints != 1)
		goto descriptor_error;

	endpoint = &desc->endpoint[0].desc;

1643 1644
	/* If it's not an interrupt in endpoint, we'd better punt! */
	if (!usb_endpoint_is_int_in(endpoint))
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1645 1646 1647 1648 1649
		goto descriptor_error;

	/* We found a hub */
	dev_info (&intf->dev, "USB hub found\n");

1650
	hub = kzalloc(sizeof(*hub), GFP_KERNEL);
L
Linus Torvalds 已提交
1651 1652 1653 1654 1655
	if (!hub) {
		dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
		return -ENOMEM;
	}

1656
	kref_init(&hub->kref);
L
Linus Torvalds 已提交
1657 1658 1659
	INIT_LIST_HEAD(&hub->event_list);
	hub->intfdev = &intf->dev;
	hub->hdev = hdev;
D
David Howells 已提交
1660
	INIT_DELAYED_WORK(&hub->leds, led_work);
1661
	INIT_DELAYED_WORK(&hub->init_work, NULL);
1662
	usb_get_intf(intf);
L
Linus Torvalds 已提交
1663 1664

	usb_set_intfdata (intf, hub);
1665
	intf->needs_remote_wakeup = 1;
L
Linus Torvalds 已提交
1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680

	if (hdev->speed == USB_SPEED_HIGH)
		highspeed_hubs++;

	if (hub_configure(hub, endpoint) >= 0)
		return 0;

	hub_disconnect (intf);
	return -ENODEV;
}

static int
hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
{
	struct usb_device *hdev = interface_to_usbdev (intf);
1681
	struct usb_hub *hub = hdev_to_hub(hdev);
L
Linus Torvalds 已提交
1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694

	/* assert ifno == 0 (part of hub spec) */
	switch (code) {
	case USBDEVFS_HUB_PORTINFO: {
		struct usbdevfs_hub_portinfo *info = user_data;
		int i;

		spin_lock_irq(&device_state_lock);
		if (hdev->devnum <= 0)
			info->nports = 0;
		else {
			info->nports = hdev->maxchild;
			for (i = 0; i < info->nports; i++) {
1695
				if (hub->ports[i]->child == NULL)
L
Linus Torvalds 已提交
1696 1697 1698
					info->port[i] = 0;
				else
					info->port[i] =
1699
						hub->ports[i]->child->devnum;
L
Linus Torvalds 已提交
1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711
			}
		}
		spin_unlock_irq(&device_state_lock);

		return info->nports + 1;
		}

	default:
		return -ENOSYS;
	}
}

1712 1713 1714 1715 1716
/*
 * Allow user programs to claim ports on a hub.  When a device is attached
 * to one of these "claimed" ports, the program will "own" the device.
 */
static int find_port_owner(struct usb_device *hdev, unsigned port1,
1717
		struct dev_state ***ppowner)
1718 1719 1720 1721 1722 1723 1724 1725 1726
{
	if (hdev->state == USB_STATE_NOTATTACHED)
		return -ENODEV;
	if (port1 == 0 || port1 > hdev->maxchild)
		return -EINVAL;

	/* This assumes that devices not managed by the hub driver
	 * will always have maxchild equal to 0.
	 */
L
Lan Tianyu 已提交
1727
	*ppowner = &(hdev_to_hub(hdev)->ports[port1 - 1]->port_owner);
1728 1729 1730 1731
	return 0;
}

/* In the following three functions, the caller must hold hdev's lock */
1732 1733
int usb_hub_claim_port(struct usb_device *hdev, unsigned port1,
		       struct dev_state *owner)
1734 1735
{
	int rc;
1736
	struct dev_state **powner;
1737 1738 1739 1740 1741 1742 1743 1744 1745 1746

	rc = find_port_owner(hdev, port1, &powner);
	if (rc)
		return rc;
	if (*powner)
		return -EBUSY;
	*powner = owner;
	return rc;
}

1747 1748
int usb_hub_release_port(struct usb_device *hdev, unsigned port1,
			 struct dev_state *owner)
1749 1750
{
	int rc;
1751
	struct dev_state **powner;
1752 1753 1754 1755 1756 1757 1758 1759 1760 1761

	rc = find_port_owner(hdev, port1, &powner);
	if (rc)
		return rc;
	if (*powner != owner)
		return -ENOENT;
	*powner = NULL;
	return rc;
}

1762
void usb_hub_release_all_ports(struct usb_device *hdev, struct dev_state *owner)
1763
{
L
Lan Tianyu 已提交
1764
	struct usb_hub *hub = hdev_to_hub(hdev);
1765 1766
	int n;

L
Lan Tianyu 已提交
1767 1768 1769
	for (n = 0; n < hdev->maxchild; n++) {
		if (hub->ports[n]->port_owner == owner)
			hub->ports[n]->port_owner = NULL;
1770
	}
L
Lan Tianyu 已提交
1771

1772 1773 1774 1775 1776 1777 1778 1779 1780 1781
}

/* The caller must hold udev's lock */
bool usb_device_is_owned(struct usb_device *udev)
{
	struct usb_hub *hub;

	if (udev->state == USB_STATE_NOTATTACHED || !udev->parent)
		return false;
	hub = hdev_to_hub(udev->parent);
L
Lan Tianyu 已提交
1782
	return !!hub->ports[udev->portnum - 1]->port_owner;
1783 1784
}

L
Linus Torvalds 已提交
1785 1786
static void recursively_mark_NOTATTACHED(struct usb_device *udev)
{
1787
	struct usb_hub *hub = hdev_to_hub(udev);
L
Linus Torvalds 已提交
1788 1789 1790
	int i;

	for (i = 0; i < udev->maxchild; ++i) {
1791 1792
		if (hub->ports[i]->child)
			recursively_mark_NOTATTACHED(hub->ports[i]->child);
L
Linus Torvalds 已提交
1793
	}
1794
	if (udev->state == USB_STATE_SUSPENDED)
S
Sarah Sharp 已提交
1795
		udev->active_duration -= jiffies;
L
Linus Torvalds 已提交
1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823
	udev->state = USB_STATE_NOTATTACHED;
}

/**
 * usb_set_device_state - change a device's current state (usbcore, hcds)
 * @udev: pointer to device whose state should be changed
 * @new_state: new state value to be stored
 *
 * udev->state is _not_ fully protected by the device lock.  Although
 * most transitions are made only while holding the lock, the state can
 * can change to USB_STATE_NOTATTACHED at almost any time.  This
 * is so that devices can be marked as disconnected as soon as possible,
 * without having to wait for any semaphores to be released.  As a result,
 * all changes to any device's state must be protected by the
 * device_state_lock spinlock.
 *
 * Once a device has been added to the device tree, all changes to its state
 * should be made using this routine.  The state should _not_ be set directly.
 *
 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
 * Otherwise udev->state is set to new_state, and if new_state is
 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
 * to USB_STATE_NOTATTACHED.
 */
void usb_set_device_state(struct usb_device *udev,
		enum usb_device_state new_state)
{
	unsigned long flags;
1824
	int wakeup = -1;
L
Linus Torvalds 已提交
1825 1826 1827 1828

	spin_lock_irqsave(&device_state_lock, flags);
	if (udev->state == USB_STATE_NOTATTACHED)
		;	/* do nothing */
D
David Brownell 已提交
1829
	else if (new_state != USB_STATE_NOTATTACHED) {
1830 1831 1832 1833 1834

		/* root hub wakeup capabilities are managed out-of-band
		 * and may involve silicon errata ... ignore them here.
		 */
		if (udev->parent) {
1835 1836 1837 1838
			if (udev->state == USB_STATE_SUSPENDED
					|| new_state == USB_STATE_SUSPENDED)
				;	/* No change to wakeup settings */
			else if (new_state == USB_STATE_CONFIGURED)
1839 1840
				wakeup = udev->actconfig->desc.bmAttributes
					 & USB_CONFIG_ATT_WAKEUP;
1841
			else
1842
				wakeup = 0;
1843
		}
S
Sarah Sharp 已提交
1844 1845 1846 1847 1848 1849
		if (udev->state == USB_STATE_SUSPENDED &&
			new_state != USB_STATE_SUSPENDED)
			udev->active_duration -= jiffies;
		else if (new_state == USB_STATE_SUSPENDED &&
				udev->state != USB_STATE_SUSPENDED)
			udev->active_duration += jiffies;
1850
		udev->state = new_state;
D
David Brownell 已提交
1851
	} else
L
Linus Torvalds 已提交
1852 1853
		recursively_mark_NOTATTACHED(udev);
	spin_unlock_irqrestore(&device_state_lock, flags);
1854 1855
	if (wakeup >= 0)
		device_set_wakeup_capable(&udev->dev, wakeup);
L
Linus Torvalds 已提交
1856
}
1857
EXPORT_SYMBOL_GPL(usb_set_device_state);
L
Linus Torvalds 已提交
1858

1859
/*
1860 1861 1862 1863 1864 1865 1866
 * Choose a device number.
 *
 * Device numbers are used as filenames in usbfs.  On USB-1.1 and
 * USB-2.0 buses they are also used as device addresses, however on
 * USB-3.0 buses the address is assigned by the controller hardware
 * and it usually is not the same as the device number.
 *
1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881
 * WUSB devices are simple: they have no hubs behind, so the mapping
 * device <-> virtual port number becomes 1:1. Why? to simplify the
 * life of the device connection logic in
 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
 * handshake we need to assign a temporary address in the unauthorized
 * space. For simplicity we use the first virtual port number found to
 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
 * and that becomes it's address [X < 128] or its unauthorized address
 * [X | 0x80].
 *
 * We add 1 as an offset to the one-based USB-stack port number
 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
 * 0 is reserved by USB for default address; (b) Linux's USB stack
 * uses always #1 for the root hub of the controller. So USB stack's
 * port #1, which is wusb virtual-port #0 has address #2.
1882 1883 1884 1885 1886
 *
 * Devices connected under xHCI are not as simple.  The host controller
 * supports virtualization, so the hardware assigns device addresses and
 * the HCD must setup data structures before issuing a set address
 * command to the hardware.
1887
 */
1888
static void choose_devnum(struct usb_device *udev)
L
Linus Torvalds 已提交
1889 1890 1891 1892 1893
{
	int		devnum;
	struct usb_bus	*bus = udev->bus;

	/* If khubd ever becomes multithreaded, this will need a lock */
1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906
	if (udev->wusb) {
		devnum = udev->portnum + 1;
		BUG_ON(test_bit(devnum, bus->devmap.devicemap));
	} else {
		/* Try to allocate the next devnum beginning at
		 * bus->devnum_next. */
		devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
					    bus->devnum_next);
		if (devnum >= 128)
			devnum = find_next_zero_bit(bus->devmap.devicemap,
						    128, 1);
		bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
	}
L
Linus Torvalds 已提交
1907 1908 1909 1910 1911 1912
	if (devnum < 128) {
		set_bit(devnum, bus->devmap.devicemap);
		udev->devnum = devnum;
	}
}

1913
static void release_devnum(struct usb_device *udev)
L
Linus Torvalds 已提交
1914 1915 1916 1917 1918 1919 1920
{
	if (udev->devnum > 0) {
		clear_bit(udev->devnum, udev->bus->devmap.devicemap);
		udev->devnum = -1;
	}
}

1921
static void update_devnum(struct usb_device *udev, int devnum)
1922 1923 1924 1925 1926 1927
{
	/* The address for a WUSB device is managed by wusbcore. */
	if (!udev->wusb)
		udev->devnum = devnum;
}

1928 1929 1930 1931 1932 1933 1934 1935 1936
static void hub_free_dev(struct usb_device *udev)
{
	struct usb_hcd *hcd = bus_to_hcd(udev->bus);

	/* Root hubs aren't real devices, so don't free HCD resources */
	if (hcd->driver->free_dev && udev->parent)
		hcd->driver->free_dev(hcd, udev);
}

L
Linus Torvalds 已提交
1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955
/**
 * usb_disconnect - disconnect a device (usbcore-internal)
 * @pdev: pointer to device being disconnected
 * Context: !in_interrupt ()
 *
 * Something got disconnected. Get rid of it and all of its children.
 *
 * If *pdev is a normal device then the parent hub must already be locked.
 * If *pdev is a root hub then this routine will acquire the
 * usb_bus_list_lock on behalf of the caller.
 *
 * Only hub drivers (including virtual root hub drivers for host
 * controllers) should ever call this.
 *
 * This call is synchronous, and may not be used in an interrupt context.
 */
void usb_disconnect(struct usb_device **pdev)
{
	struct usb_device	*udev = *pdev;
1956
	struct usb_hub		*hub = hdev_to_hub(udev);
L
Linus Torvalds 已提交
1957 1958 1959 1960
	int			i;

	/* mark the device as inactive, so any further urb submissions for
	 * this device (and any of its children) will fail immediately.
L
Lucas De Marchi 已提交
1961
	 * this quiesces everything except pending urbs.
L
Linus Torvalds 已提交
1962 1963
	 */
	usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1964 1965
	dev_info(&udev->dev, "USB disconnect, device number %d\n",
			udev->devnum);
L
Linus Torvalds 已提交
1966

1967 1968
	usb_lock_device(udev);

L
Linus Torvalds 已提交
1969
	/* Free up all the children before we remove this device */
1970
	for (i = 0; i < udev->maxchild; i++) {
1971 1972
		if (hub->ports[i]->child)
			usb_disconnect(&hub->ports[i]->child);
L
Linus Torvalds 已提交
1973 1974 1975 1976 1977 1978
	}

	/* deallocate hcd/hardware state ... nuking all pending urbs and
	 * cleaning up all state associated with the current configuration
	 * so that the hardware is now fully quiesced.
	 */
1979
	dev_dbg (&udev->dev, "unregistering device\n");
L
Linus Torvalds 已提交
1980
	usb_disable_device(udev, 0);
1981
	usb_hcd_synchronize_unlinks(udev);
L
Linus Torvalds 已提交
1982

A
Alan Stern 已提交
1983
	usb_remove_ep_devs(&udev->ep0);
1984 1985 1986
	usb_unlock_device(udev);

	/* Unregister the device.  The device driver is responsible
A
Alan Stern 已提交
1987 1988
	 * for de-configuring the device and invoking the remove-device
	 * notifier chain (used by usbfs and possibly others).
1989 1990
	 */
	device_del(&udev->dev);
1991

1992
	/* Free the device number and delete the parent's children[]
L
Linus Torvalds 已提交
1993 1994
	 * (or root_hub) pointer.
	 */
1995
	release_devnum(udev);
L
Linus Torvalds 已提交
1996 1997 1998 1999 2000 2001

	/* Avoid races with recursively_mark_NOTATTACHED() */
	spin_lock_irq(&device_state_lock);
	*pdev = NULL;
	spin_unlock_irq(&device_state_lock);

2002 2003
	hub_free_dev(udev);

2004
	put_device(&udev->dev);
L
Linus Torvalds 已提交
2005 2006
}

2007
#ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
L
Linus Torvalds 已提交
2008 2009 2010 2011 2012 2013 2014
static void show_string(struct usb_device *udev, char *id, char *string)
{
	if (!string)
		return;
	dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
}

2015 2016 2017 2018 2019
static void announce_device(struct usb_device *udev)
{
	dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n",
		le16_to_cpu(udev->descriptor.idVendor),
		le16_to_cpu(udev->descriptor.idProduct));
2020 2021
	dev_info(&udev->dev,
		"New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
2022 2023 2024 2025 2026 2027 2028
		udev->descriptor.iManufacturer,
		udev->descriptor.iProduct,
		udev->descriptor.iSerialNumber);
	show_string(udev, "Product", udev->product);
	show_string(udev, "Manufacturer", udev->manufacturer);
	show_string(udev, "SerialNumber", udev->serial);
}
L
Linus Torvalds 已提交
2029
#else
2030
static inline void announce_device(struct usb_device *udev) { }
L
Linus Torvalds 已提交
2031 2032 2033 2034 2035 2036
#endif

#ifdef	CONFIG_USB_OTG
#include "otg_whitelist.h"
#endif

2037
/**
A
Alan Stern 已提交
2038
 * usb_enumerate_device_otg - FIXME (usbcore-internal)
2039 2040
 * @udev: newly addressed device (in ADDRESS state)
 *
A
Alan Stern 已提交
2041
 * Finish enumeration for On-The-Go devices
2042
 */
A
Alan Stern 已提交
2043
static int usb_enumerate_device_otg(struct usb_device *udev)
L
Linus Torvalds 已提交
2044
{
2045
	int err = 0;
L
Linus Torvalds 已提交
2046 2047 2048 2049 2050 2051 2052 2053 2054 2055

#ifdef	CONFIG_USB_OTG
	/*
	 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
	 * to wake us after we've powered off VBUS; and HNP, switching roles
	 * "host" to "peripheral".  The OTG descriptor helps figure this out.
	 */
	if (!udev->bus->is_b_host
			&& udev->config
			&& udev->parent == udev->bus->root_hub) {
F
Felipe Balbi 已提交
2056
		struct usb_otg_descriptor	*desc = NULL;
L
Linus Torvalds 已提交
2057 2058 2059 2060 2061 2062 2063
		struct usb_bus			*bus = udev->bus;

		/* descriptor may appear anywhere in config */
		if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
					le16_to_cpu(udev->config[0].desc.wTotalLength),
					USB_DT_OTG, (void **) &desc) == 0) {
			if (desc->bmAttributes & USB_OTG_HNP) {
2064
				unsigned		port1 = udev->portnum;
D
David Brownell 已提交
2065

L
Linus Torvalds 已提交
2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085
				dev_info(&udev->dev,
					"Dual-Role OTG device on %sHNP port\n",
					(port1 == bus->otg_port)
						? "" : "non-");

				/* enable HNP before suspend, it's simpler */
				if (port1 == bus->otg_port)
					bus->b_hnp_enable = 1;
				err = usb_control_msg(udev,
					usb_sndctrlpipe(udev, 0),
					USB_REQ_SET_FEATURE, 0,
					bus->b_hnp_enable
						? USB_DEVICE_B_HNP_ENABLE
						: USB_DEVICE_A_ALT_HNP_SUPPORT,
					0, NULL, 0, USB_CTRL_SET_TIMEOUT);
				if (err < 0) {
					/* OTG MESSAGE: report errors here,
					 * customize to match your product.
					 */
					dev_info(&udev->dev,
2086
						"can't set HNP mode: %d\n",
L
Linus Torvalds 已提交
2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099
						err);
					bus->b_hnp_enable = 0;
				}
			}
		}
	}

	if (!is_targeted(udev)) {

		/* Maybe it can talk to us, though we can't talk to it.
		 * (Includes HNP test device.)
		 */
		if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
2100
			err = usb_port_suspend(udev, PMSG_SUSPEND);
L
Linus Torvalds 已提交
2101 2102 2103
			if (err < 0)
				dev_dbg(&udev->dev, "HNP fail, %d\n", err);
		}
2104
		err = -ENOTSUPP;
L
Linus Torvalds 已提交
2105 2106
		goto fail;
	}
2107
fail:
L
Linus Torvalds 已提交
2108
#endif
2109 2110 2111 2112 2113
	return err;
}


/**
A
Alan Stern 已提交
2114
 * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
2115 2116 2117 2118 2119 2120 2121 2122 2123 2124
 * @udev: newly addressed device (in ADDRESS state)
 *
 * This is only called by usb_new_device() and usb_authorize_device()
 * and FIXME -- all comments that apply to them apply here wrt to
 * environment.
 *
 * If the device is WUSB and not authorized, we don't attempt to read
 * the string descriptors, as they will be errored out by the device
 * until it has been authorized.
 */
A
Alan Stern 已提交
2125
static int usb_enumerate_device(struct usb_device *udev)
2126 2127
{
	int err;
L
Linus Torvalds 已提交
2128

2129 2130 2131 2132 2133
	if (udev->config == NULL) {
		err = usb_get_configuration(udev);
		if (err < 0) {
			dev_err(&udev->dev, "can't read configurations, error %d\n",
				err);
2134
			return err;
2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148
		}
	}
	if (udev->wusb == 1 && udev->authorized == 0) {
		udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
		udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
		udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
	}
	else {
		/* read the standard strings and cache them if present */
		udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
		udev->manufacturer = usb_cache_string(udev,
						      udev->descriptor.iManufacturer);
		udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
	}
A
Alan Stern 已提交
2149
	err = usb_enumerate_device_otg(udev);
2150 2151 2152 2153 2154 2155
	if (err < 0)
		return err;

	usb_detect_interface_quirks(udev);

	return 0;
2156 2157
}

2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176
static void set_usb_port_removable(struct usb_device *udev)
{
	struct usb_device *hdev = udev->parent;
	struct usb_hub *hub;
	u8 port = udev->portnum;
	u16 wHubCharacteristics;
	bool removable = true;

	if (!hdev)
		return;

	hub = hdev_to_hub(udev->parent);

	wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);

	if (!(wHubCharacteristics & HUB_CHAR_COMPOUND))
		return;

	if (hub_is_superspeed(hdev)) {
2177 2178
		if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable)
				& (1 << port))
2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189
			removable = false;
	} else {
		if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8)))
			removable = false;
	}

	if (removable)
		udev->removable = USB_DEVICE_REMOVABLE;
	else
		udev->removable = USB_DEVICE_FIXED;
}
2190 2191 2192 2193 2194

/**
 * usb_new_device - perform initial device setup (usbcore-internal)
 * @udev: newly addressed device (in ADDRESS state)
 *
A
Alan Stern 已提交
2195 2196
 * This is called with devices which have been detected but not fully
 * enumerated.  The device descriptor is available, but not descriptors
2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214
 * for any device configuration.  The caller must have locked either
 * the parent hub (if udev is a normal device) or else the
 * usb_bus_list_lock (if udev is a root hub).  The parent's pointer to
 * udev has already been installed, but udev is not yet visible through
 * sysfs or other filesystem code.
 *
 * It will return if the device is configured properly or not.  Zero if
 * the interface was registered with the driver core; else a negative
 * errno value.
 *
 * This call is synchronous, and may not be used in an interrupt context.
 *
 * Only the hub driver or root-hub registrar should ever call this.
 */
int usb_new_device(struct usb_device *udev)
{
	int err;

2215 2216 2217 2218 2219 2220 2221 2222
	if (udev->parent) {
		/* Initialize non-root-hub device wakeup to disabled;
		 * device (un)configuration controls wakeup capable
		 * sysfs power/wakeup controls wakeup enabled/disabled
		 */
		device_init_wakeup(&udev->dev, 0);
	}

2223 2224
	/* Tell the runtime-PM framework the device is active */
	pm_runtime_set_active(&udev->dev);
2225
	pm_runtime_get_noresume(&udev->dev);
2226
	pm_runtime_use_autosuspend(&udev->dev);
2227 2228
	pm_runtime_enable(&udev->dev);

2229 2230 2231 2232 2233
	/* By default, forbid autosuspend for all devices.  It will be
	 * allowed for hubs during binding.
	 */
	usb_disable_autosuspend(udev);

A
Alan Stern 已提交
2234
	err = usb_enumerate_device(udev);	/* Read descriptors */
2235 2236
	if (err < 0)
		goto fail;
2237 2238 2239
	dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n",
			udev->devnum, udev->bus->busnum,
			(((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
2240 2241 2242 2243
	/* export the usbdev device-node for libusb */
	udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
			(((udev->bus->busnum-1) * 128) + (udev->devnum-1)));

A
Alan Stern 已提交
2244 2245
	/* Tell the world! */
	announce_device(udev);
2246

2247 2248 2249 2250 2251 2252 2253 2254
	if (udev->serial)
		add_device_randomness(udev->serial, strlen(udev->serial));
	if (udev->product)
		add_device_randomness(udev->product, strlen(udev->product));
	if (udev->manufacturer)
		add_device_randomness(udev->manufacturer,
				      strlen(udev->manufacturer));

2255
	device_enable_async_suspend(&udev->dev);
2256 2257 2258 2259 2260 2261 2262 2263 2264

	/*
	 * check whether the hub marks this port as non-removable. Do it
	 * now so that platform-specific data can override it in
	 * device_add()
	 */
	if (udev->parent)
		set_usb_port_removable(udev);

2265
	/* Register the device.  The device driver is responsible
A
Alan Stern 已提交
2266 2267
	 * for configuring the device and invoking the add-device
	 * notifier chain (used by usbfs and possibly others).
2268
	 */
2269
	err = device_add(&udev->dev);
L
Linus Torvalds 已提交
2270 2271 2272 2273
	if (err) {
		dev_err(&udev->dev, "can't device_add, error %d\n", err);
		goto fail;
	}
2274

A
Alan Stern 已提交
2275
	(void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev);
2276 2277
	usb_mark_last_busy(udev);
	pm_runtime_put_sync_autosuspend(&udev->dev);
2278
	return err;
L
Linus Torvalds 已提交
2279 2280 2281

fail:
	usb_set_device_state(udev, USB_STATE_NOTATTACHED);
2282 2283
	pm_runtime_disable(&udev->dev);
	pm_runtime_set_suspended(&udev->dev);
2284
	return err;
L
Linus Torvalds 已提交
2285 2286
}

2287 2288

/**
R
Randy Dunlap 已提交
2289 2290 2291 2292 2293
 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
 * @usb_dev: USB device
 *
 * Move the USB device to a very basic state where interfaces are disabled
 * and the device is in fact unconfigured and unusable.
2294 2295 2296 2297 2298 2299 2300 2301 2302
 *
 * We share a lock (that we have) with device_del(), so we need to
 * defer its call.
 */
int usb_deauthorize_device(struct usb_device *usb_dev)
{
	usb_lock_device(usb_dev);
	if (usb_dev->authorized == 0)
		goto out_unauthorized;
2303

2304 2305
	usb_dev->authorized = 0;
	usb_set_configuration(usb_dev, -1);
2306 2307

	kfree(usb_dev->product);
2308
	usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
2309
	kfree(usb_dev->manufacturer);
2310
	usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
2311
	kfree(usb_dev->serial);
2312
	usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
2313 2314

	usb_destroy_configuration(usb_dev);
2315
	usb_dev->descriptor.bNumConfigurations = 0;
2316

2317 2318 2319 2320 2321 2322 2323 2324 2325
out_unauthorized:
	usb_unlock_device(usb_dev);
	return 0;
}


int usb_authorize_device(struct usb_device *usb_dev)
{
	int result = 0, c;
2326

2327 2328 2329
	usb_lock_device(usb_dev);
	if (usb_dev->authorized == 1)
		goto out_authorized;
2330

2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342
	result = usb_autoresume_device(usb_dev);
	if (result < 0) {
		dev_err(&usb_dev->dev,
			"can't autoresume for authorization: %d\n", result);
		goto error_autoresume;
	}
	result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
	if (result < 0) {
		dev_err(&usb_dev->dev, "can't re-read device descriptor for "
			"authorization: %d\n", result);
		goto error_device_descriptor;
	}
2343 2344 2345 2346 2347 2348 2349 2350

	kfree(usb_dev->product);
	usb_dev->product = NULL;
	kfree(usb_dev->manufacturer);
	usb_dev->manufacturer = NULL;
	kfree(usb_dev->serial);
	usb_dev->serial = NULL;

2351
	usb_dev->authorized = 1;
A
Alan Stern 已提交
2352
	result = usb_enumerate_device(usb_dev);
2353
	if (result < 0)
A
Alan Stern 已提交
2354
		goto error_enumerate;
2355 2356 2357
	/* Choose and set the configuration.  This registers the interfaces
	 * with the driver core and lets interface drivers bind to them.
	 */
2358
	c = usb_choose_configuration(usb_dev);
2359 2360 2361 2362 2363 2364 2365 2366 2367 2368
	if (c >= 0) {
		result = usb_set_configuration(usb_dev, c);
		if (result) {
			dev_err(&usb_dev->dev,
				"can't set config #%d, error %d\n", c, result);
			/* This need not be fatal.  The user can try to
			 * set other configurations. */
		}
	}
	dev_info(&usb_dev->dev, "authorized to connect\n");
2369

A
Alan Stern 已提交
2370
error_enumerate:
2371
error_device_descriptor:
2372
	usb_autosuspend_device(usb_dev);
2373 2374 2375 2376 2377 2378 2379
error_autoresume:
out_authorized:
	usb_unlock_device(usb_dev);	// complements locktree
	return result;
}


2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390
/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
static unsigned hub_is_wusb(struct usb_hub *hub)
{
	struct usb_hcd *hcd;
	if (hub->hdev->parent != NULL)  /* not a root hub? */
		return 0;
	hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
	return hcd->wireless;
}


L
Linus Torvalds 已提交
2391 2392 2393 2394
#define PORT_RESET_TRIES	5
#define SET_ADDRESS_TRIES	2
#define GET_DESCRIPTOR_TRIES	2
#define SET_CONFIG_TRIES	(2 * (use_both_schemes + 1))
2395
#define USE_NEW_SCHEME(i)	((i) / 2 == (int)old_scheme_first)
L
Linus Torvalds 已提交
2396 2397 2398

#define HUB_ROOT_RESET_TIME	50	/* times are in msec */
#define HUB_SHORT_RESET_TIME	10
A
Andiry Xu 已提交
2399
#define HUB_BH_RESET_TIME	50
L
Linus Torvalds 已提交
2400 2401 2402
#define HUB_LONG_RESET_TIME	200
#define HUB_RESET_TIMEOUT	500

2403 2404 2405
static int hub_port_reset(struct usb_hub *hub, int port1,
			struct usb_device *udev, unsigned int delay, bool warm);

2406 2407 2408 2409
/* Is a USB 3.0 port in the Inactive or Complinance Mode state?
 * Port worm reset is required to recover
 */
static bool hub_port_warm_reset_required(struct usb_hub *hub, u16 portstatus)
2410 2411
{
	return hub_is_superspeed(hub->hdev) &&
2412 2413 2414 2415
		(((portstatus & USB_PORT_STAT_LINK_STATE) ==
		  USB_SS_PORT_LS_SS_INACTIVE) ||
		 ((portstatus & USB_PORT_STAT_LINK_STATE) ==
		  USB_SS_PORT_LS_COMP_MOD)) ;
2416 2417
}

L
Linus Torvalds 已提交
2418
static int hub_port_wait_reset(struct usb_hub *hub, int port1,
A
Andiry Xu 已提交
2419
			struct usb_device *udev, unsigned int delay, bool warm)
L
Linus Torvalds 已提交
2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435
{
	int delay_time, ret;
	u16 portstatus;
	u16 portchange;

	for (delay_time = 0;
			delay_time < HUB_RESET_TIMEOUT;
			delay_time += delay) {
		/* wait to give the device a chance to reset */
		msleep(delay);

		/* read and decode port status */
		ret = hub_port_status(hub, port1, &portstatus, &portchange);
		if (ret < 0)
			return ret;

A
Andiry Xu 已提交
2436 2437 2438 2439 2440
		/*
		 * Some buggy devices require a warm reset to be issued even
		 * when the port appears not to be connected.
		 */
		if (!warm) {
2441 2442 2443 2444 2445 2446 2447 2448 2449 2450
			/*
			 * Some buggy devices can cause an NEC host controller
			 * to transition to the "Error" state after a hot port
			 * reset.  This will show up as the port state in
			 * "Inactive", and the port may also report a
			 * disconnect.  Forcing a warm port reset seems to make
			 * the device work.
			 *
			 * See https://bugzilla.kernel.org/show_bug.cgi?id=41752
			 */
2451
			if (hub_port_warm_reset_required(hub, portstatus)) {
2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472
				int ret;

				if ((portchange & USB_PORT_STAT_C_CONNECTION))
					clear_port_feature(hub->hdev, port1,
							USB_PORT_FEAT_C_CONNECTION);
				if (portchange & USB_PORT_STAT_C_LINK_STATE)
					clear_port_feature(hub->hdev, port1,
							USB_PORT_FEAT_C_PORT_LINK_STATE);
				if (portchange & USB_PORT_STAT_C_RESET)
					clear_port_feature(hub->hdev, port1,
							USB_PORT_FEAT_C_RESET);
				dev_dbg(hub->intfdev, "hot reset failed, warm reset port %d\n",
						port1);
				ret = hub_port_reset(hub, port1,
						udev, HUB_BH_RESET_TIME,
						true);
				if ((portchange & USB_PORT_STAT_C_CONNECTION))
					clear_port_feature(hub->hdev, port1,
							USB_PORT_FEAT_C_CONNECTION);
				return ret;
			}
A
Andiry Xu 已提交
2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500
			/* Device went away? */
			if (!(portstatus & USB_PORT_STAT_CONNECTION))
				return -ENOTCONN;

			/* bomb out completely if the connection bounced */
			if ((portchange & USB_PORT_STAT_C_CONNECTION))
				return -ENOTCONN;

			/* if we`ve finished resetting, then break out of
			 * the loop
			 */
			if (!(portstatus & USB_PORT_STAT_RESET) &&
			    (portstatus & USB_PORT_STAT_ENABLE)) {
				if (hub_is_wusb(hub))
					udev->speed = USB_SPEED_WIRELESS;
				else if (hub_is_superspeed(hub->hdev))
					udev->speed = USB_SPEED_SUPER;
				else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
					udev->speed = USB_SPEED_HIGH;
				else if (portstatus & USB_PORT_STAT_LOW_SPEED)
					udev->speed = USB_SPEED_LOW;
				else
					udev->speed = USB_SPEED_FULL;
				return 0;
			}
		} else {
			if (portchange & USB_PORT_STAT_C_BH_RESET)
				return 0;
L
Linus Torvalds 已提交
2501 2502 2503 2504 2505 2506 2507
		}

		/* switch to the long delay after two short delay failures */
		if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
			delay = HUB_LONG_RESET_TIME;

		dev_dbg (hub->intfdev,
A
Andiry Xu 已提交
2508 2509
			"port %d not %sreset yet, waiting %dms\n",
			port1, warm ? "warm " : "", delay);
L
Linus Torvalds 已提交
2510 2511 2512 2513 2514
	}

	return -EBUSY;
}

A
Andiry Xu 已提交
2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555
static void hub_port_finish_reset(struct usb_hub *hub, int port1,
			struct usb_device *udev, int *status, bool warm)
{
	switch (*status) {
	case 0:
		if (!warm) {
			struct usb_hcd *hcd;
			/* TRSTRCY = 10 ms; plus some extra */
			msleep(10 + 40);
			update_devnum(udev, 0);
			hcd = bus_to_hcd(udev->bus);
			if (hcd->driver->reset_device) {
				*status = hcd->driver->reset_device(hcd, udev);
				if (*status < 0) {
					dev_err(&udev->dev, "Cannot reset "
							"HCD device state\n");
					break;
				}
			}
		}
		/* FALL THROUGH */
	case -ENOTCONN:
	case -ENODEV:
		clear_port_feature(hub->hdev,
				port1, USB_PORT_FEAT_C_RESET);
		/* FIXME need disconnect() for NOTATTACHED device */
		if (warm) {
			clear_port_feature(hub->hdev, port1,
					USB_PORT_FEAT_C_BH_PORT_RESET);
			clear_port_feature(hub->hdev, port1,
					USB_PORT_FEAT_C_PORT_LINK_STATE);
		} else {
			usb_set_device_state(udev, *status
					? USB_STATE_NOTATTACHED
					: USB_STATE_DEFAULT);
		}
		break;
	}
}

/* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */
L
Linus Torvalds 已提交
2556
static int hub_port_reset(struct usb_hub *hub, int port1,
A
Andiry Xu 已提交
2557
			struct usb_device *udev, unsigned int delay, bool warm)
L
Linus Torvalds 已提交
2558 2559 2560
{
	int i, status;

A
Andiry Xu 已提交
2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572
	if (!warm) {
		/* Block EHCI CF initialization during the port reset.
		 * Some companion controllers don't like it when they mix.
		 */
		down_read(&ehci_cf_port_reset_rwsem);
	} else {
		if (!hub_is_superspeed(hub->hdev)) {
			dev_err(hub->intfdev, "only USB3 hub support "
						"warm reset\n");
			return -EINVAL;
		}
	}
2573

L
Linus Torvalds 已提交
2574 2575
	/* Reset the port */
	for (i = 0; i < PORT_RESET_TRIES; i++) {
A
Andiry Xu 已提交
2576 2577 2578 2579
		status = set_port_feature(hub->hdev, port1, (warm ?
					USB_PORT_FEAT_BH_PORT_RESET :
					USB_PORT_FEAT_RESET));
		if (status) {
L
Linus Torvalds 已提交
2580
			dev_err(hub->intfdev,
A
Andiry Xu 已提交
2581 2582 2583 2584 2585
					"cannot %sreset port %d (err = %d)\n",
					warm ? "warm " : "", port1, status);
		} else {
			status = hub_port_wait_reset(hub, port1, udev, delay,
								warm);
2586
			if (status && status != -ENOTCONN)
L
Linus Torvalds 已提交
2587 2588 2589 2590 2591 2592
				dev_dbg(hub->intfdev,
						"port_wait_reset: err = %d\n",
						status);
		}

		/* return on disconnect or reset */
A
Andiry Xu 已提交
2593 2594
		if (status == 0 || status == -ENOTCONN || status == -ENODEV) {
			hub_port_finish_reset(hub, port1, udev, &status, warm);
2595
			goto done;
L
Linus Torvalds 已提交
2596 2597 2598
		}

		dev_dbg (hub->intfdev,
A
Andiry Xu 已提交
2599 2600
			"port %d not enabled, trying %sreset again...\n",
			port1, warm ? "warm " : "");
L
Linus Torvalds 已提交
2601 2602 2603 2604 2605 2606 2607
		delay = HUB_LONG_RESET_TIME;
	}

	dev_err (hub->intfdev,
		"Cannot enable port %i.  Maybe the USB cable is bad?\n",
		port1);

A
Andiry Xu 已提交
2608 2609 2610
done:
	if (!warm)
		up_read(&ehci_cf_port_reset_rwsem);
2611

A
Andiry Xu 已提交
2612
	return status;
2613 2614
}

2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630
/* Check if a port is power on */
static int port_is_power_on(struct usb_hub *hub, unsigned portstatus)
{
	int ret = 0;

	if (hub_is_superspeed(hub->hdev)) {
		if (portstatus & USB_SS_PORT_STAT_POWER)
			ret = 1;
	} else {
		if (portstatus & USB_PORT_STAT_POWER)
			ret = 1;
	}

	return ret;
}

A
Alan Stern 已提交
2631
#ifdef	CONFIG_PM
L
Linus Torvalds 已提交
2632

2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648
/* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */
static int port_is_suspended(struct usb_hub *hub, unsigned portstatus)
{
	int ret = 0;

	if (hub_is_superspeed(hub->hdev)) {
		if ((portstatus & USB_PORT_STAT_LINK_STATE)
				== USB_SS_PORT_LS_U3)
			ret = 1;
	} else {
		if (portstatus & USB_PORT_STAT_SUSPEND)
			ret = 1;
	}

	return ret;
}
2649 2650 2651 2652 2653 2654 2655 2656 2657

/* Determine whether the device on a port is ready for a normal resume,
 * is ready for a reset-resume, or should be disconnected.
 */
static int check_port_resume_type(struct usb_device *udev,
		struct usb_hub *hub, int port1,
		int status, unsigned portchange, unsigned portstatus)
{
	/* Is the device still present? */
2658 2659 2660
	if (status || port_is_suspended(hub, portstatus) ||
			!port_is_power_on(hub, portstatus) ||
			!(portstatus & USB_PORT_STAT_CONNECTION)) {
2661 2662 2663 2664
		if (status >= 0)
			status = -ENODEV;
	}

2665 2666 2667 2668 2669 2670 2671 2672 2673
	/* Can't do a normal resume if the port isn't enabled,
	 * so try a reset-resume instead.
	 */
	else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) {
		if (udev->persist_enabled)
			udev->reset_resume = 1;
		else
			status = -ENODEV;
	}
2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692

	if (status) {
		dev_dbg(hub->intfdev,
				"port %d status %04x.%04x after resume, %d\n",
				port1, portchange, portstatus, status);
	} else if (udev->reset_resume) {

		/* Late port handoff can set status-change bits */
		if (portchange & USB_PORT_STAT_C_CONNECTION)
			clear_port_feature(hub->hdev, port1,
					USB_PORT_FEAT_C_CONNECTION);
		if (portchange & USB_PORT_STAT_C_ENABLE)
			clear_port_feature(hub->hdev, port1,
					USB_PORT_FEAT_C_ENABLE);
	}

	return status;
}

2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736
int usb_disable_ltm(struct usb_device *udev)
{
	struct usb_hcd *hcd = bus_to_hcd(udev->bus);

	/* Check if the roothub and device supports LTM. */
	if (!usb_device_supports_ltm(hcd->self.root_hub) ||
			!usb_device_supports_ltm(udev))
		return 0;

	/* Clear Feature LTM Enable can only be sent if the device is
	 * configured.
	 */
	if (!udev->actconfig)
		return 0;

	return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
			USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
			USB_DEVICE_LTM_ENABLE, 0, NULL, 0,
			USB_CTRL_SET_TIMEOUT);
}
EXPORT_SYMBOL_GPL(usb_disable_ltm);

void usb_enable_ltm(struct usb_device *udev)
{
	struct usb_hcd *hcd = bus_to_hcd(udev->bus);

	/* Check if the roothub and device supports LTM. */
	if (!usb_device_supports_ltm(hcd->self.root_hub) ||
			!usb_device_supports_ltm(udev))
		return;

	/* Set Feature LTM Enable can only be sent if the device is
	 * configured.
	 */
	if (!udev->actconfig)
		return;

	usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
			USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
			USB_DEVICE_LTM_ENABLE, 0, NULL, 0,
			USB_CTRL_SET_TIMEOUT);
}
EXPORT_SYMBOL_GPL(usb_enable_ltm);

L
Linus Torvalds 已提交
2737 2738 2739
#ifdef	CONFIG_USB_SUSPEND

/*
A
Alan Stern 已提交
2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752
 * usb_port_suspend - suspend a usb device's upstream port
 * @udev: device that's no longer in active use, not a root hub
 * Context: must be able to sleep; device not locked; pm locks held
 *
 * Suspends a USB device that isn't in active use, conserving power.
 * Devices may wake out of a suspend, if anything important happens,
 * using the remote wakeup mechanism.  They may also be taken out of
 * suspend by the host, using usb_port_resume().  It's also routine
 * to disconnect devices while they are suspended.
 *
 * This only affects the USB hardware for a device; its interfaces
 * (and, for hubs, child devices) must already have been suspended.
 *
L
Linus Torvalds 已提交
2753 2754 2755 2756 2757 2758 2759 2760
 * Selective port suspend reduces power; most suspended devices draw
 * less than 500 uA.  It's also used in OTG, along with remote wakeup.
 * All devices below the suspended port are also suspended.
 *
 * Devices leave suspend state when the host wakes them up.  Some devices
 * also support "remote wakeup", where the device can activate the USB
 * tree above them to deliver data, such as a keypress or packet.  In
 * some cases, this wakes the USB host.
A
Alan Stern 已提交
2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783
 *
 * Suspending OTG devices may trigger HNP, if that's been enabled
 * between a pair of dual-role devices.  That will change roles, such
 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
 *
 * Devices on USB hub ports have only one "suspend" state, corresponding
 * to ACPI D2, "may cause the device to lose some context".
 * State transitions include:
 *
 *   - suspend, resume ... when the VBUS power link stays live
 *   - suspend, disconnect ... VBUS lost
 *
 * Once VBUS drop breaks the circuit, the port it's using has to go through
 * normal re-enumeration procedures, starting with enabling VBUS power.
 * Other than re-initializing the hub (plug/unplug, except for root hubs),
 * Linux (2.6) currently has NO mechanisms to initiate that:  no khubd
 * timer, no SRP, no requests through sysfs.
 *
 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
 * the root hub for their bus goes into global suspend ... so we don't
 * (falsely) update the device power state to say it suspended.
 *
 * Returns 0 on success, else negative errno.
L
Linus Torvalds 已提交
2784
 */
A
Alan Stern 已提交
2785
int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
L
Linus Torvalds 已提交
2786
{
A
Alan Stern 已提交
2787 2788 2789
	struct usb_hub	*hub = hdev_to_hub(udev->parent);
	int		port1 = udev->portnum;
	int		status;
L
Linus Torvalds 已提交
2790 2791 2792 2793 2794 2795 2796

	/* enable remote wakeup when appropriate; this lets the device
	 * wake up the upstream hub (including maybe the root hub).
	 *
	 * NOTE:  OTG devices may issue remote wakeup (or SRP) even when
	 * we don't explicitly enable it here.
	 */
2797
	if (udev->do_remote_wakeup) {
2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813
		if (!hub_is_superspeed(hub->hdev)) {
			status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
					USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
					USB_DEVICE_REMOTE_WAKEUP, 0,
					NULL, 0,
					USB_CTRL_SET_TIMEOUT);
		} else {
			/* Assume there's only one function on the USB 3.0
			 * device and enable remote wake for the first
			 * interface. FIXME if the interface association
			 * descriptor shows there's more than one function.
			 */
			status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
					USB_REQ_SET_FEATURE,
					USB_RECIP_INTERFACE,
					USB_INTRF_FUNC_SUSPEND,
2814 2815
					USB_INTRF_FUNC_SUSPEND_RW |
					USB_INTRF_FUNC_SUSPEND_LP,
2816 2817 2818
					NULL, 0,
					USB_CTRL_SET_TIMEOUT);
		}
2819
		if (status) {
A
Alan Stern 已提交
2820 2821
			dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
					status);
2822
			/* bail if autosuspend is requested */
2823
			if (PMSG_IS_AUTO(msg))
2824 2825
				return status;
		}
L
Linus Torvalds 已提交
2826 2827
	}

A
Andiry Xu 已提交
2828 2829 2830 2831
	/* disable USB2 hardware LPM */
	if (udev->usb2_hw_lpm_enabled == 1)
		usb_set_usb2_hardware_lpm(udev, 0);

2832 2833 2834 2835 2836
	if (usb_disable_ltm(udev)) {
		dev_err(&udev->dev, "%s Failed to disable LTM before suspend\n.",
				__func__);
		return -ENOMEM;
	}
2837 2838 2839 2840 2841 2842
	if (usb_unlocked_disable_lpm(udev)) {
		dev_err(&udev->dev, "%s Failed to disable LPM before suspend\n.",
				__func__);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
2843
	/* see 7.1.7.6 */
2844 2845 2846 2847
	if (hub_is_superspeed(hub->hdev))
		status = set_port_feature(hub->hdev,
				port1 | (USB_SS_PORT_LS_U3 << 3),
				USB_PORT_FEAT_LINK_STATE);
2848 2849 2850
	else
		status = set_port_feature(hub->hdev, port1,
						USB_PORT_FEAT_SUSPEND);
L
Linus Torvalds 已提交
2851
	if (status) {
A
Alan Stern 已提交
2852 2853
		dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
				port1, status);
L
Linus Torvalds 已提交
2854
		/* paranoia:  "should not happen" */
2855 2856
		if (udev->do_remote_wakeup)
			(void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
L
Linus Torvalds 已提交
2857 2858 2859 2860
				USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
				USB_DEVICE_REMOTE_WAKEUP, 0,
				NULL, 0,
				USB_CTRL_SET_TIMEOUT);
2861

2862 2863 2864 2865
		/* Try to enable USB2 hardware LPM again */
		if (udev->usb2_hw_lpm_capable == 1)
			usb_set_usb2_hardware_lpm(udev, 1);

2866 2867
		/* Try to enable USB3 LTM and LPM again */
		usb_enable_ltm(udev);
2868 2869
		usb_unlocked_enable_lpm(udev);

2870
		/* System sleep transitions should never fail */
2871
		if (!PMSG_IS_AUTO(msg))
2872
			status = 0;
L
Linus Torvalds 已提交
2873 2874
	} else {
		/* device has up to 10 msec to fully suspend */
2875 2876 2877
		dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n",
				(PMSG_IS_AUTO(msg) ? "auto-" : ""),
				udev->do_remote_wakeup);
L
Linus Torvalds 已提交
2878 2879 2880
		usb_set_device_state(udev, USB_STATE_SUSPENDED);
		msleep(10);
	}
2881
	usb_mark_last_busy(hub->hdev);
L
Linus Torvalds 已提交
2882 2883 2884 2885
	return status;
}

/*
2886 2887
 * If the USB "suspend" state is in use (rather than "global suspend"),
 * many devices will be individually taken out of suspend state using
2888
 * special "resume" signaling.  This routine kicks in shortly after
L
Linus Torvalds 已提交
2889 2890 2891
 * hardware resume signaling is finished, either because of selective
 * resume (by host) or remote wakeup (by device) ... now see what changed
 * in the tree that's rooted at this device.
2892 2893 2894
 *
 * If @udev->reset_resume is set then the device is reset before the
 * status check is done.
L
Linus Torvalds 已提交
2895
 */
2896
static int finish_port_resume(struct usb_device *udev)
L
Linus Torvalds 已提交
2897
{
2898
	int	status = 0;
L
Linus Torvalds 已提交
2899 2900 2901
	u16	devstatus;

	/* caller owns the udev device lock */
2902 2903
	dev_dbg(&udev->dev, "%s\n",
		udev->reset_resume ? "finish reset-resume" : "finish resume");
L
Linus Torvalds 已提交
2904 2905 2906 2907 2908 2909 2910 2911 2912 2913

	/* usb ch9 identifies four variants of SUSPENDED, based on what
	 * state the device resumes to.  Linux currently won't see the
	 * first two on the host side; they'd be inside hub_port_init()
	 * during many timeouts, but khubd can't suspend until later.
	 */
	usb_set_device_state(udev, udev->actconfig
			? USB_STATE_CONFIGURED
			: USB_STATE_ADDRESS);

2914 2915 2916 2917 2918 2919
	/* 10.5.4.5 says not to reset a suspended port if the attached
	 * device is enabled for remote wakeup.  Hence the reset
	 * operation is carried out here, after the port has been
	 * resumed.
	 */
	if (udev->reset_resume)
2920
 retry_reset_resume:
2921
		status = usb_reset_and_verify_device(udev);
2922

L
Linus Torvalds 已提交
2923 2924 2925 2926
 	/* 10.5.4.5 says be sure devices in the tree are still there.
 	 * For now let's assume the device didn't go crazy on resume,
	 * and device drivers will know about any resume quirks.
	 */
2927
	if (status == 0) {
2928
		devstatus = 0;
2929 2930
		status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
		if (status >= 0)
2931
			status = (status > 0 ? 0 : -ENODEV);
2932 2933 2934 2935 2936 2937 2938

		/* If a normal resume failed, try doing a reset-resume */
		if (status && !udev->reset_resume && udev->persist_enabled) {
			dev_dbg(&udev->dev, "retry with reset-resume\n");
			udev->reset_resume = 1;
			goto retry_reset_resume;
		}
2939
	}
2940

A
Alan Stern 已提交
2941 2942 2943 2944
	if (status) {
		dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
				status);
	} else if (udev->actconfig) {
L
Linus Torvalds 已提交
2945
		le16_to_cpus(&devstatus);
2946
		if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
L
Linus Torvalds 已提交
2947 2948 2949 2950 2951 2952 2953
			status = usb_control_msg(udev,
					usb_sndctrlpipe(udev, 0),
					USB_REQ_CLEAR_FEATURE,
						USB_RECIP_DEVICE,
					USB_DEVICE_REMOTE_WAKEUP, 0,
					NULL, 0,
					USB_CTRL_SET_TIMEOUT);
2954
			if (status)
2955 2956 2957
				dev_dbg(&udev->dev,
					"disable remote wakeup, status %d\n",
					status);
2958
		}
L
Linus Torvalds 已提交
2959 2960 2961 2962 2963
		status = 0;
	}
	return status;
}

A
Alan Stern 已提交
2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974
/*
 * usb_port_resume - re-activate a suspended usb device's upstream port
 * @udev: device to re-activate, not a root hub
 * Context: must be able to sleep; device not locked; pm locks held
 *
 * This will re-activate the suspended device, increasing power usage
 * while letting drivers communicate again with its endpoints.
 * USB resume explicitly guarantees that the power session between
 * the host and the device is the same as it was when the device
 * suspended.
 *
2975 2976
 * If @udev->reset_resume is set then this routine won't check that the
 * port is still enabled.  Furthermore, finish_port_resume() above will
2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987
 * reset @udev.  The end result is that a broken power session can be
 * recovered and @udev will appear to persist across a loss of VBUS power.
 *
 * For example, if a host controller doesn't maintain VBUS suspend current
 * during a system sleep or is reset when the system wakes up, all the USB
 * power sessions below it will be broken.  This is especially troublesome
 * for mass-storage devices containing mounted filesystems, since the
 * device will appear to have disconnected and all the memory mappings
 * to it will be lost.  Using the USB_PERSIST facility, the device can be
 * made to appear as if it had not disconnected.
 *
2988
 * This facility can be dangerous.  Although usb_reset_and_verify_device() makes
2989
 * every effort to insure that the same device is present after the
2990 2991 2992 2993 2994 2995
 * reset as before, it cannot provide a 100% guarantee.  Furthermore it's
 * quite possible for a device to remain unaltered but its media to be
 * changed.  If the user replaces a flash memory card while the system is
 * asleep, he will have only himself to blame when the filesystem on the
 * new card is corrupted and the system crashes.
 *
A
Alan Stern 已提交
2996 2997
 * Returns 0 on success, else negative errno.
 */
A
Alan Stern 已提交
2998
int usb_port_resume(struct usb_device *udev, pm_message_t msg)
L
Linus Torvalds 已提交
2999
{
A
Alan Stern 已提交
3000 3001 3002 3003
	struct usb_hub	*hub = hdev_to_hub(udev->parent);
	int		port1 = udev->portnum;
	int		status;
	u16		portchange, portstatus;
3004 3005 3006

	/* Skip the initial Clear-Suspend step for a remote wakeup */
	status = hub_port_status(hub, port1, &portstatus, &portchange);
3007
	if (status == 0 && !port_is_suspended(hub, portstatus))
3008
		goto SuspendCleared;
L
Linus Torvalds 已提交
3009 3010 3011

	// dev_dbg(hub->intfdev, "resume port %d\n", port1);

3012 3013
	set_bit(port1, hub->busy_bits);

L
Linus Torvalds 已提交
3014
	/* see 7.1.7.7; affects power usage, but not budgeting */
3015 3016 3017 3018 3019 3020 3021
	if (hub_is_superspeed(hub->hdev))
		status = set_port_feature(hub->hdev,
				port1 | (USB_SS_PORT_LS_U0 << 3),
				USB_PORT_FEAT_LINK_STATE);
	else
		status = clear_port_feature(hub->hdev,
				port1, USB_PORT_FEAT_SUSPEND);
L
Linus Torvalds 已提交
3022
	if (status) {
A
Alan Stern 已提交
3023 3024
		dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
				port1, status);
L
Linus Torvalds 已提交
3025 3026
	} else {
		/* drive resume for at least 20 msec */
3027
		dev_dbg(&udev->dev, "usb %sresume\n",
3028
				(PMSG_IS_AUTO(msg) ? "auto-" : ""));
L
Linus Torvalds 已提交
3029 3030 3031 3032 3033 3034
		msleep(25);

		/* Virtual root hubs can trigger on GET_PORT_STATUS to
		 * stop resume signaling.  Then finish the resume
		 * sequence.
		 */
3035
		status = hub_port_status(hub, port1, &portstatus, &portchange);
3036

3037 3038 3039 3040
		/* TRSMRCY = 10 msec */
		msleep(10);
	}

3041
 SuspendCleared:
3042
	if (status == 0) {
3043 3044 3045 3046 3047 3048 3049 3050 3051
		if (hub_is_superspeed(hub->hdev)) {
			if (portchange & USB_PORT_STAT_C_LINK_STATE)
				clear_port_feature(hub->hdev, port1,
					USB_PORT_FEAT_C_PORT_LINK_STATE);
		} else {
			if (portchange & USB_PORT_STAT_C_SUSPEND)
				clear_port_feature(hub->hdev, port1,
						USB_PORT_FEAT_C_SUSPEND);
		}
L
Linus Torvalds 已提交
3052 3053
	}

3054 3055
	clear_bit(port1, hub->busy_bits);

3056 3057
	status = check_port_resume_type(udev,
			hub, port1, status, portchange, portstatus);
3058 3059 3060 3061 3062
	if (status == 0)
		status = finish_port_resume(udev);
	if (status < 0) {
		dev_dbg(&udev->dev, "can't resume, status %d\n", status);
		hub_port_logical_disconnect(hub, port1);
A
Andiry Xu 已提交
3063 3064 3065 3066
	} else  {
		/* Try to enable USB2 hardware LPM */
		if (udev->usb2_hw_lpm_capable == 1)
			usb_set_usb2_hardware_lpm(udev, 1);
3067

3068 3069
		/* Try to enable USB3 LTM and LPM */
		usb_enable_ltm(udev);
3070
		usb_unlocked_enable_lpm(udev);
3071
	}
A
Andiry Xu 已提交
3072

L
Linus Torvalds 已提交
3073 3074 3075
	return status;
}

3076
/* caller has locked udev */
3077
int usb_remote_wakeup(struct usb_device *udev)
L
Linus Torvalds 已提交
3078 3079 3080 3081
{
	int	status = 0;

	if (udev->state == USB_STATE_SUSPENDED) {
3082
		dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
3083 3084 3085 3086 3087
		status = usb_autoresume_device(udev);
		if (status == 0) {
			/* Let the drivers do their thing, then... */
			usb_autosuspend_device(udev);
		}
L
Linus Torvalds 已提交
3088 3089 3090 3091
	}
	return status;
}

A
Alan Stern 已提交
3092 3093 3094 3095
#else	/* CONFIG_USB_SUSPEND */

/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */

A
Alan Stern 已提交
3096
int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
A
Alan Stern 已提交
3097 3098 3099 3100
{
	return 0;
}

3101 3102
/* However we may need to do a reset-resume */

A
Alan Stern 已提交
3103
int usb_port_resume(struct usb_device *udev, pm_message_t msg)
A
Alan Stern 已提交
3104
{
3105 3106 3107 3108 3109 3110 3111 3112
	struct usb_hub	*hub = hdev_to_hub(udev->parent);
	int		port1 = udev->portnum;
	int		status;
	u16		portchange, portstatus;

	status = hub_port_status(hub, port1, &portstatus, &portchange);
	status = check_port_resume_type(udev,
			hub, port1, status, portchange, portstatus);
3113

3114 3115 3116 3117
	if (status) {
		dev_dbg(&udev->dev, "can't resume, status %d\n", status);
		hub_port_logical_disconnect(hub, port1);
	} else if (udev->reset_resume) {
3118
		dev_dbg(&udev->dev, "reset-resume\n");
3119
		status = usb_reset_and_verify_device(udev);
3120 3121
	}
	return status;
A
Alan Stern 已提交
3122 3123 3124 3125
}

#endif

D
David Brownell 已提交
3126
static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
L
Linus Torvalds 已提交
3127 3128 3129 3130
{
	struct usb_hub		*hub = usb_get_intfdata (intf);
	struct usb_device	*hdev = hub->hdev;
	unsigned		port1;
3131
	int			status;
L
Linus Torvalds 已提交
3132

3133
	/* Warn if children aren't already suspended */
L
Linus Torvalds 已提交
3134 3135 3136
	for (port1 = 1; port1 <= hdev->maxchild; port1++) {
		struct usb_device	*udev;

3137
		udev = hub->ports[port1 - 1]->child;
3138
		if (udev && udev->can_submit) {
3139
			dev_warn(&intf->dev, "port %d nyet suspended\n", port1);
3140
			if (PMSG_IS_AUTO(msg))
3141
				return -EBUSY;
3142
		}
L
Linus Torvalds 已提交
3143
	}
3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154
	if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) {
		/* Enable hub to send remote wakeup for all ports. */
		for (port1 = 1; port1 <= hdev->maxchild; port1++) {
			status = set_port_feature(hdev,
					port1 |
					USB_PORT_FEAT_REMOTE_WAKE_CONNECT |
					USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT |
					USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT,
					USB_PORT_FEAT_REMOTE_WAKE_MASK);
		}
	}
L
Linus Torvalds 已提交
3155

3156
	dev_dbg(&intf->dev, "%s\n", __func__);
3157

3158
	/* stop khubd and related activity */
3159
	hub_quiesce(hub, HUB_SUSPEND);
3160
	return 0;
L
Linus Torvalds 已提交
3161 3162 3163 3164
}

static int hub_resume(struct usb_interface *intf)
{
3165
	struct usb_hub *hub = usb_get_intfdata(intf);
3166

3167
	dev_dbg(&intf->dev, "%s\n", __func__);
3168
	hub_activate(hub, HUB_RESUME);
L
Linus Torvalds 已提交
3169 3170 3171
	return 0;
}

3172
static int hub_reset_resume(struct usb_interface *intf)
A
Alan Stern 已提交
3173
{
3174
	struct usb_hub *hub = usb_get_intfdata(intf);
A
Alan Stern 已提交
3175

3176
	dev_dbg(&intf->dev, "%s\n", __func__);
3177
	hub_activate(hub, HUB_RESET_RESUME);
A
Alan Stern 已提交
3178 3179 3180
	return 0;
}

3181 3182 3183 3184 3185 3186
/**
 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
 * @rhdev: struct usb_device for the root hub
 *
 * The USB host controller driver calls this function when its root hub
 * is resumed and Vbus power has been interrupted or the controller
3187 3188 3189 3190
 * has been reset.  The routine marks @rhdev as having lost power.
 * When the hub driver is resumed it will take notice and carry out
 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
 * the others will be disconnected.
3191 3192 3193 3194 3195 3196 3197 3198
 */
void usb_root_hub_lost_power(struct usb_device *rhdev)
{
	dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
	rhdev->reset_resume = 1;
}
EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);

3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243
static const char * const usb3_lpm_names[]  = {
	"U0",
	"U1",
	"U2",
	"U3",
};

/*
 * Send a Set SEL control transfer to the device, prior to enabling
 * device-initiated U1 or U2.  This lets the device know the exit latencies from
 * the time the device initiates a U1 or U2 exit, to the time it will receive a
 * packet from the host.
 *
 * This function will fail if the SEL or PEL values for udev are greater than
 * the maximum allowed values for the link state to be enabled.
 */
static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state)
{
	struct usb_set_sel_req *sel_values;
	unsigned long long u1_sel;
	unsigned long long u1_pel;
	unsigned long long u2_sel;
	unsigned long long u2_pel;
	int ret;

	/* Convert SEL and PEL stored in ns to us */
	u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000);
	u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000);
	u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000);
	u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000);

	/*
	 * Make sure that the calculated SEL and PEL values for the link
	 * state we're enabling aren't bigger than the max SEL/PEL
	 * value that will fit in the SET SEL control transfer.
	 * Otherwise the device would get an incorrect idea of the exit
	 * latency for the link state, and could start a device-initiated
	 * U1/U2 when the exit latencies are too high.
	 */
	if ((state == USB3_LPM_U1 &&
				(u1_sel > USB3_LPM_MAX_U1_SEL_PEL ||
				 u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) ||
			(state == USB3_LPM_U2 &&
			 (u2_sel > USB3_LPM_MAX_U2_SEL_PEL ||
			  u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) {
3244
		dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n",
3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405
				usb3_lpm_names[state], u1_sel, u1_pel);
		return -EINVAL;
	}

	/*
	 * If we're enabling device-initiated LPM for one link state,
	 * but the other link state has a too high SEL or PEL value,
	 * just set those values to the max in the Set SEL request.
	 */
	if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL)
		u1_sel = USB3_LPM_MAX_U1_SEL_PEL;

	if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL)
		u1_pel = USB3_LPM_MAX_U1_SEL_PEL;

	if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL)
		u2_sel = USB3_LPM_MAX_U2_SEL_PEL;

	if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL)
		u2_pel = USB3_LPM_MAX_U2_SEL_PEL;

	/*
	 * usb_enable_lpm() can be called as part of a failed device reset,
	 * which may be initiated by an error path of a mass storage driver.
	 * Therefore, use GFP_NOIO.
	 */
	sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO);
	if (!sel_values)
		return -ENOMEM;

	sel_values->u1_sel = u1_sel;
	sel_values->u1_pel = u1_pel;
	sel_values->u2_sel = cpu_to_le16(u2_sel);
	sel_values->u2_pel = cpu_to_le16(u2_pel);

	ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
			USB_REQ_SET_SEL,
			USB_RECIP_DEVICE,
			0, 0,
			sel_values, sizeof *(sel_values),
			USB_CTRL_SET_TIMEOUT);
	kfree(sel_values);
	return ret;
}

/*
 * Enable or disable device-initiated U1 or U2 transitions.
 */
static int usb_set_device_initiated_lpm(struct usb_device *udev,
		enum usb3_link_state state, bool enable)
{
	int ret;
	int feature;

	switch (state) {
	case USB3_LPM_U1:
		feature = USB_DEVICE_U1_ENABLE;
		break;
	case USB3_LPM_U2:
		feature = USB_DEVICE_U2_ENABLE;
		break;
	default:
		dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n",
				__func__, enable ? "enable" : "disable");
		return -EINVAL;
	}

	if (udev->state != USB_STATE_CONFIGURED) {
		dev_dbg(&udev->dev, "%s: Can't %s %s state "
				"for unconfigured device.\n",
				__func__, enable ? "enable" : "disable",
				usb3_lpm_names[state]);
		return 0;
	}

	if (enable) {
		/*
		 * Now send the control transfer to enable device-initiated LPM
		 * for either U1 or U2.
		 */
		ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
				USB_REQ_SET_FEATURE,
				USB_RECIP_DEVICE,
				feature,
				0, NULL, 0,
				USB_CTRL_SET_TIMEOUT);
	} else {
		ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
				USB_REQ_CLEAR_FEATURE,
				USB_RECIP_DEVICE,
				feature,
				0, NULL, 0,
				USB_CTRL_SET_TIMEOUT);
	}
	if (ret < 0) {
		dev_warn(&udev->dev, "%s of device-initiated %s failed.\n",
				enable ? "Enable" : "Disable",
				usb3_lpm_names[state]);
		return -EBUSY;
	}
	return 0;
}

static int usb_set_lpm_timeout(struct usb_device *udev,
		enum usb3_link_state state, int timeout)
{
	int ret;
	int feature;

	switch (state) {
	case USB3_LPM_U1:
		feature = USB_PORT_FEAT_U1_TIMEOUT;
		break;
	case USB3_LPM_U2:
		feature = USB_PORT_FEAT_U2_TIMEOUT;
		break;
	default:
		dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n",
				__func__);
		return -EINVAL;
	}

	if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT &&
			timeout != USB3_LPM_DEVICE_INITIATED) {
		dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, "
				"which is a reserved value.\n",
				usb3_lpm_names[state], timeout);
		return -EINVAL;
	}

	ret = set_port_feature(udev->parent,
			USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum,
			feature);
	if (ret < 0) {
		dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x,"
				"error code %i\n", usb3_lpm_names[state],
				timeout, ret);
		return -EBUSY;
	}
	if (state == USB3_LPM_U1)
		udev->u1_params.timeout = timeout;
	else
		udev->u2_params.timeout = timeout;
	return 0;
}

/*
 * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated
 * U1/U2 entry.
 *
 * We will attempt to enable U1 or U2, but there are no guarantees that the
 * control transfers to set the hub timeout or enable device-initiated U1/U2
 * will be successful.
 *
 * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI
 * driver know about it.  If that call fails, it should be harmless, and just
 * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency.
 */
static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev,
		enum usb3_link_state state)
{
3406
	int timeout, ret;
3407 3408 3409 3410 3411 3412 3413 3414 3415 3416
	__u8 u1_mel = udev->bos->ss_cap->bU1devExitLat;
	__le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat;

	/* If the device says it doesn't have *any* exit latency to come out of
	 * U1 or U2, it's probably lying.  Assume it doesn't implement that link
	 * state.
	 */
	if ((state == USB3_LPM_U1 && u1_mel == 0) ||
			(state == USB3_LPM_U2 && u2_mel == 0))
		return;
3417

3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428
	/*
	 * First, let the device know about the exit latencies
	 * associated with the link state we're about to enable.
	 */
	ret = usb_req_set_sel(udev, state);
	if (ret < 0) {
		dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n",
				usb3_lpm_names[state]);
		return;
	}

3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525
	/* We allow the host controller to set the U1/U2 timeout internally
	 * first, so that it can change its schedule to account for the
	 * additional latency to send data to a device in a lower power
	 * link state.
	 */
	timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state);

	/* xHCI host controller doesn't want to enable this LPM state. */
	if (timeout == 0)
		return;

	if (timeout < 0) {
		dev_warn(&udev->dev, "Could not enable %s link state, "
				"xHCI error %i.\n", usb3_lpm_names[state],
				timeout);
		return;
	}

	if (usb_set_lpm_timeout(udev, state, timeout))
		/* If we can't set the parent hub U1/U2 timeout,
		 * device-initiated LPM won't be allowed either, so let the xHCI
		 * host know that this link state won't be enabled.
		 */
		hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state);

	/* Only a configured device will accept the Set Feature U1/U2_ENABLE */
	else if (udev->actconfig)
		usb_set_device_initiated_lpm(udev, state, true);

}

/*
 * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated
 * U1/U2 entry.
 *
 * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry.
 * If zero is returned, the parent will not allow the link to go into U1/U2.
 *
 * If zero is returned, device-initiated U1/U2 entry may still be enabled, but
 * it won't have an effect on the bus link state because the parent hub will
 * still disallow device-initiated U1/U2 entry.
 *
 * If zero is returned, the xHCI host controller may still think U1/U2 entry is
 * possible.  The result will be slightly more bus bandwidth will be taken up
 * (to account for U1/U2 exit latency), but it should be harmless.
 */
static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev,
		enum usb3_link_state state)
{
	int feature;

	switch (state) {
	case USB3_LPM_U1:
		feature = USB_PORT_FEAT_U1_TIMEOUT;
		break;
	case USB3_LPM_U2:
		feature = USB_PORT_FEAT_U2_TIMEOUT;
		break;
	default:
		dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n",
				__func__);
		return -EINVAL;
	}

	if (usb_set_lpm_timeout(udev, state, 0))
		return -EBUSY;

	usb_set_device_initiated_lpm(udev, state, false);

	if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state))
		dev_warn(&udev->dev, "Could not disable xHCI %s timeout, "
				"bus schedule bandwidth may be impacted.\n",
				usb3_lpm_names[state]);
	return 0;
}

/*
 * Disable hub-initiated and device-initiated U1 and U2 entry.
 * Caller must own the bandwidth_mutex.
 *
 * This will call usb_enable_lpm() on failure, which will decrement
 * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero.
 */
int usb_disable_lpm(struct usb_device *udev)
{
	struct usb_hcd *hcd;

	if (!udev || !udev->parent ||
			udev->speed != USB_SPEED_SUPER ||
			!udev->lpm_capable)
		return 0;

	hcd = bus_to_hcd(udev->bus);
	if (!hcd || !hcd->driver->disable_usb3_lpm_timeout)
		return 0;

	udev->lpm_disable_count++;
3526
	if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0))
3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608
		return 0;

	/* If LPM is enabled, attempt to disable it. */
	if (usb_disable_link_state(hcd, udev, USB3_LPM_U1))
		goto enable_lpm;
	if (usb_disable_link_state(hcd, udev, USB3_LPM_U2))
		goto enable_lpm;

	return 0;

enable_lpm:
	usb_enable_lpm(udev);
	return -EBUSY;
}
EXPORT_SYMBOL_GPL(usb_disable_lpm);

/* Grab the bandwidth_mutex before calling usb_disable_lpm() */
int usb_unlocked_disable_lpm(struct usb_device *udev)
{
	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
	int ret;

	if (!hcd)
		return -EINVAL;

	mutex_lock(hcd->bandwidth_mutex);
	ret = usb_disable_lpm(udev);
	mutex_unlock(hcd->bandwidth_mutex);

	return ret;
}
EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm);

/*
 * Attempt to enable device-initiated and hub-initiated U1 and U2 entry.  The
 * xHCI host policy may prevent U1 or U2 from being enabled.
 *
 * Other callers may have disabled link PM, so U1 and U2 entry will be disabled
 * until the lpm_disable_count drops to zero.  Caller must own the
 * bandwidth_mutex.
 */
void usb_enable_lpm(struct usb_device *udev)
{
	struct usb_hcd *hcd;

	if (!udev || !udev->parent ||
			udev->speed != USB_SPEED_SUPER ||
			!udev->lpm_capable)
		return;

	udev->lpm_disable_count--;
	hcd = bus_to_hcd(udev->bus);
	/* Double check that we can both enable and disable LPM.
	 * Device must be configured to accept set feature U1/U2 timeout.
	 */
	if (!hcd || !hcd->driver->enable_usb3_lpm_timeout ||
			!hcd->driver->disable_usb3_lpm_timeout)
		return;

	if (udev->lpm_disable_count > 0)
		return;

	usb_enable_link_state(hcd, udev, USB3_LPM_U1);
	usb_enable_link_state(hcd, udev, USB3_LPM_U2);
}
EXPORT_SYMBOL_GPL(usb_enable_lpm);

/* Grab the bandwidth_mutex before calling usb_enable_lpm() */
void usb_unlocked_enable_lpm(struct usb_device *udev)
{
	struct usb_hcd *hcd = bus_to_hcd(udev->bus);

	if (!hcd)
		return;

	mutex_lock(hcd->bandwidth_mutex);
	usb_enable_lpm(udev);
	mutex_unlock(hcd->bandwidth_mutex);
}
EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm);


A
Alan Stern 已提交
3609 3610
#else	/* CONFIG_PM */

A
Alan Stern 已提交
3611 3612 3613
#define hub_suspend		NULL
#define hub_resume		NULL
#define hub_reset_resume	NULL
3614 3615 3616 3617 3618

int usb_disable_lpm(struct usb_device *udev)
{
	return 0;
}
3619
EXPORT_SYMBOL_GPL(usb_disable_lpm);
3620 3621

void usb_enable_lpm(struct usb_device *udev) { }
3622
EXPORT_SYMBOL_GPL(usb_enable_lpm);
3623 3624 3625 3626 3627

int usb_unlocked_disable_lpm(struct usb_device *udev)
{
	return 0;
}
3628
EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm);
3629 3630

void usb_unlocked_enable_lpm(struct usb_device *udev) { }
3631
EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm);
3632 3633 3634 3635 3636 3637 3638 3639 3640

int usb_disable_ltm(struct usb_device *udev)
{
	return 0;
}
EXPORT_SYMBOL_GPL(usb_disable_ltm);

void usb_enable_ltm(struct usb_device *udev) { }
EXPORT_SYMBOL_GPL(usb_enable_ltm);
A
Alan Stern 已提交
3641 3642
#endif

L
Linus Torvalds 已提交
3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699

/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
 *
 * Between connect detection and reset signaling there must be a delay
 * of 100ms at least for debounce and power-settling.  The corresponding
 * timer shall restart whenever the downstream port detects a disconnect.
 * 
 * Apparently there are some bluetooth and irda-dongles and a number of
 * low-speed devices for which this debounce period may last over a second.
 * Not covered by the spec - but easy to deal with.
 *
 * This implementation uses a 1500ms total debounce timeout; if the
 * connection isn't stable by then it returns -ETIMEDOUT.  It checks
 * every 25ms for transient disconnects.  When the port status has been
 * unchanged for 100ms it returns the port status.
 */
static int hub_port_debounce(struct usb_hub *hub, int port1)
{
	int ret;
	int total_time, stable_time = 0;
	u16 portchange, portstatus;
	unsigned connection = 0xffff;

	for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
		ret = hub_port_status(hub, port1, &portstatus, &portchange);
		if (ret < 0)
			return ret;

		if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
		     (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
			stable_time += HUB_DEBOUNCE_STEP;
			if (stable_time >= HUB_DEBOUNCE_STABLE)
				break;
		} else {
			stable_time = 0;
			connection = portstatus & USB_PORT_STAT_CONNECTION;
		}

		if (portchange & USB_PORT_STAT_C_CONNECTION) {
			clear_port_feature(hub->hdev, port1,
					USB_PORT_FEAT_C_CONNECTION);
		}

		if (total_time >= HUB_DEBOUNCE_TIMEOUT)
			break;
		msleep(HUB_DEBOUNCE_STEP);
	}

	dev_dbg (hub->intfdev,
		"debounce: port %d: total %dms stable %dms status 0x%x\n",
		port1, total_time, stable_time, portstatus);

	if (stable_time < HUB_DEBOUNCE_STABLE)
		return -ETIMEDOUT;
	return portstatus;
}

3700
void usb_ep0_reinit(struct usb_device *udev)
L
Linus Torvalds 已提交
3701
{
3702 3703
	usb_disable_endpoint(udev, 0 + USB_DIR_IN, true);
	usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true);
3704
	usb_enable_endpoint(udev, &udev->ep0, true);
L
Linus Torvalds 已提交
3705
}
3706
EXPORT_SYMBOL_GPL(usb_ep0_reinit);
L
Linus Torvalds 已提交
3707 3708 3709 3710

#define usb_sndaddr0pipe()	(PIPE_CONTROL << 30)
#define usb_rcvaddr0pipe()	((PIPE_CONTROL << 30) | USB_DIR_IN)

3711
static int hub_set_address(struct usb_device *udev, int devnum)
L
Linus Torvalds 已提交
3712 3713
{
	int retval;
3714
	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
L
Linus Torvalds 已提交
3715

3716 3717 3718 3719 3720
	/*
	 * The host controller will choose the device address,
	 * instead of the core having chosen it earlier
	 */
	if (!hcd->driver->address_device && devnum <= 1)
L
Linus Torvalds 已提交
3721 3722 3723 3724 3725
		return -EINVAL;
	if (udev->state == USB_STATE_ADDRESS)
		return 0;
	if (udev->state != USB_STATE_DEFAULT)
		return -EINVAL;
3726
	if (hcd->driver->address_device)
3727
		retval = hcd->driver->address_device(hcd, udev);
3728
	else
3729 3730 3731
		retval = usb_control_msg(udev, usb_sndaddr0pipe(),
				USB_REQ_SET_ADDRESS, 0, devnum, 0,
				NULL, 0, USB_CTRL_SET_TIMEOUT);
L
Linus Torvalds 已提交
3732
	if (retval == 0) {
3733
		update_devnum(udev, devnum);
3734
		/* Device now using proper address. */
L
Linus Torvalds 已提交
3735
		usb_set_device_state(udev, USB_STATE_ADDRESS);
3736
		usb_ep0_reinit(udev);
L
Linus Torvalds 已提交
3737 3738 3739 3740 3741 3742 3743 3744 3745
	}
	return retval;
}

/* Reset device, (re)assign address, get device descriptor.
 * Device connection must be stable, no more debouncing needed.
 * Returns device in USB_STATE_ADDRESS, except on error.
 *
 * If this is called for an already-existing device (as part of
3746
 * usb_reset_and_verify_device), the caller must own the device lock.  For a
L
Linus Torvalds 已提交
3747 3748 3749 3750 3751 3752 3753
 * newly detected device that is not accessible through any global
 * pointers, it's not necessary to lock the device.
 */
static int
hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
		int retry_counter)
{
3754
	static DEFINE_MUTEX(usb_address0_mutex);
L
Linus Torvalds 已提交
3755 3756

	struct usb_device	*hdev = hub->hdev;
3757
	struct usb_hcd		*hcd = bus_to_hcd(hdev->bus);
L
Linus Torvalds 已提交
3758 3759 3760
	int			i, j, retval;
	unsigned		delay = HUB_SHORT_RESET_TIME;
	enum usb_device_speed	oldspeed = udev->speed;
3761
	const char		*speed;
3762
	int			devnum = udev->devnum;
L
Linus Torvalds 已提交
3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777

	/* root hub ports have a slightly longer reset period
	 * (from USB 2.0 spec, section 7.1.7.5)
	 */
	if (!hdev->parent) {
		delay = HUB_ROOT_RESET_TIME;
		if (port1 == hdev->bus->otg_port)
			hdev->bus->b_hnp_enable = 0;
	}

	/* Some low speed devices have problems with the quick delay, so */
	/*  be a bit pessimistic with those devices. RHbug #23670 */
	if (oldspeed == USB_SPEED_LOW)
		delay = HUB_LONG_RESET_TIME;

3778
	mutex_lock(&usb_address0_mutex);
L
Linus Torvalds 已提交
3779

3780 3781
	/* Reset the device; full speed may morph to high speed */
	/* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
A
Andiry Xu 已提交
3782
	retval = hub_port_reset(hub, port1, udev, delay, false);
3783 3784 3785 3786
	if (retval < 0)		/* error or disconnect */
		goto fail;
	/* success, speed is known */

L
Linus Torvalds 已提交
3787 3788 3789 3790 3791 3792 3793
	retval = -ENODEV;

	if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
		dev_dbg(&udev->dev, "device reset changed speed!\n");
		goto fail;
	}
	oldspeed = udev->speed;
3794

L
Linus Torvalds 已提交
3795 3796
	/* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
	 * it's fixed size except for full speed devices.
3797 3798
	 * For Wireless USB devices, ep0 max packet is always 512 (tho
	 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
L
Linus Torvalds 已提交
3799 3800
	 */
	switch (udev->speed) {
3801
	case USB_SPEED_SUPER:
3802
	case USB_SPEED_WIRELESS:	/* fixed at 512 */
3803
		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
3804
		break;
L
Linus Torvalds 已提交
3805
	case USB_SPEED_HIGH:		/* fixed at 64 */
3806
		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
L
Linus Torvalds 已提交
3807 3808 3809 3810 3811 3812
		break;
	case USB_SPEED_FULL:		/* 8, 16, 32, or 64 */
		/* to determine the ep0 maxpacket size, try to read
		 * the device descriptor to get bMaxPacketSize0 and
		 * then correct our initial guess.
		 */
3813
		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
L
Linus Torvalds 已提交
3814 3815
		break;
	case USB_SPEED_LOW:		/* fixed at 8 */
3816
		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8);
L
Linus Torvalds 已提交
3817 3818 3819 3820
		break;
	default:
		goto fail;
	}
3821 3822 3823 3824 3825 3826

	if (udev->speed == USB_SPEED_WIRELESS)
		speed = "variable speed Wireless";
	else
		speed = usb_speed_string(udev->speed);

3827 3828
	if (udev->speed != USB_SPEED_SUPER)
		dev_info(&udev->dev,
3829 3830
				"%s %s USB device number %d using %s\n",
				(udev->config) ? "reset" : "new", speed,
3831
				devnum, udev->bus->controller->driver->name);
L
Linus Torvalds 已提交
3832 3833 3834 3835 3836 3837 3838

	/* Set up TT records, if needed  */
	if (hdev->tt) {
		udev->tt = hdev->tt;
		udev->ttport = hdev->ttport;
	} else if (udev->speed != USB_SPEED_HIGH
			&& hdev->speed == USB_SPEED_HIGH) {
3839 3840 3841 3842 3843
		if (!hub->tt.hub) {
			dev_err(&udev->dev, "parent hub has no TT\n");
			retval = -EINVAL;
			goto fail;
		}
L
Linus Torvalds 已提交
3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860
		udev->tt = &hub->tt;
		udev->ttport = port1;
	}
 
	/* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
	 * Because device hardware and firmware is sometimes buggy in
	 * this area, and this is how Linux has done it for ages.
	 * Change it cautiously.
	 *
	 * NOTE:  If USE_NEW_SCHEME() is true we will start by issuing
	 * a 64-byte GET_DESCRIPTOR request.  This is what Windows does,
	 * so it may help with some non-standards-compliant devices.
	 * Otherwise we start with SET_ADDRESS and then try to read the
	 * first 8 bytes of the device descriptor to get the ep0 maxpacket
	 * value.
	 */
	for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
3861
		if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) {
L
Linus Torvalds 已提交
3862 3863 3864 3865 3866 3867 3868 3869 3870 3871
			struct usb_device_descriptor *buf;
			int r = 0;

#define GET_DESCRIPTOR_BUFSIZE	64
			buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
			if (!buf) {
				retval = -ENOMEM;
				continue;
			}

3872 3873 3874
			/* Retry on all errors; some devices are flakey.
			 * 255 is for WUSB devices, we actually need to use
			 * 512 (WUSB1.0[4.8.1]).
L
Linus Torvalds 已提交
3875 3876 3877 3878 3879 3880 3881
			 */
			for (j = 0; j < 3; ++j) {
				buf->bMaxPacketSize0 = 0;
				r = usb_control_msg(udev, usb_rcvaddr0pipe(),
					USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
					USB_DT_DEVICE << 8, 0,
					buf, GET_DESCRIPTOR_BUFSIZE,
3882
					initial_descriptor_timeout);
L
Linus Torvalds 已提交
3883
				switch (buf->bMaxPacketSize0) {
3884
				case 8: case 16: case 32: case 64: case 255:
L
Linus Torvalds 已提交
3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902
					if (buf->bDescriptorType ==
							USB_DT_DEVICE) {
						r = 0;
						break;
					}
					/* FALL THROUGH */
				default:
					if (r == 0)
						r = -EPROTO;
					break;
				}
				if (r == 0)
					break;
			}
			udev->descriptor.bMaxPacketSize0 =
					buf->bMaxPacketSize0;
			kfree(buf);

A
Andiry Xu 已提交
3903
			retval = hub_port_reset(hub, port1, udev, delay, false);
L
Linus Torvalds 已提交
3904 3905 3906 3907 3908 3909 3910 3911 3912
			if (retval < 0)		/* error or disconnect */
				goto fail;
			if (oldspeed != udev->speed) {
				dev_dbg(&udev->dev,
					"device reset changed speed!\n");
				retval = -ENODEV;
				goto fail;
			}
			if (r) {
3913 3914 3915
				dev_err(&udev->dev,
					"device descriptor read/64, error %d\n",
					r);
L
Linus Torvalds 已提交
3916 3917 3918 3919 3920 3921
				retval = -EMSGSIZE;
				continue;
			}
#undef GET_DESCRIPTOR_BUFSIZE
		}

3922 3923 3924 3925 3926
 		/*
 		 * If device is WUSB, we already assigned an
 		 * unauthorized address in the Connect Ack sequence;
 		 * authorization will assign the final address.
 		 */
3927
		if (udev->wusb == 0) {
3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939
			for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
				retval = hub_set_address(udev, devnum);
				if (retval >= 0)
					break;
				msleep(200);
			}
			if (retval < 0) {
				dev_err(&udev->dev,
					"device not accepting address %d, error %d\n",
					devnum, retval);
				goto fail;
			}
3940 3941 3942
			if (udev->speed == USB_SPEED_SUPER) {
				devnum = udev->devnum;
				dev_info(&udev->dev,
3943
						"%s SuperSpeed USB device number %d using %s\n",
3944
						(udev->config) ? "reset" : "new",
3945
						devnum, udev->bus->controller->driver->name);
3946
			}
3947 3948 3949 3950 3951 3952

			/* cope with hardware quirkiness:
			 *  - let SET_ADDRESS settle, some device hardware wants it
			 *  - read ep0 maxpacket even for high and low speed,
			 */
			msleep(10);
3953
			if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3))
L
Linus Torvalds 已提交
3954
				break;
3955
  		}
L
Linus Torvalds 已提交
3956 3957 3958

		retval = usb_get_device_descriptor(udev, 8);
		if (retval < 8) {
3959 3960 3961
			dev_err(&udev->dev,
					"device descriptor read/8, error %d\n",
					retval);
L
Linus Torvalds 已提交
3962 3963 3964 3965 3966 3967 3968 3969 3970 3971
			if (retval >= 0)
				retval = -EMSGSIZE;
		} else {
			retval = 0;
			break;
		}
	}
	if (retval)
		goto fail;

3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987
	/*
	 * Some superspeed devices have finished the link training process
	 * and attached to a superspeed hub port, but the device descriptor
	 * got from those devices show they aren't superspeed devices. Warm
	 * reset the port attached by the devices can fix them.
	 */
	if ((udev->speed == USB_SPEED_SUPER) &&
			(le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) {
		dev_err(&udev->dev, "got a wrong device descriptor, "
				"warm reset device\n");
		hub_port_reset(hub, port1, udev,
				HUB_BH_RESET_TIME, true);
		retval = -EINVAL;
		goto fail;
	}

3988 3989 3990 3991 3992
	if (udev->descriptor.bMaxPacketSize0 == 0xff ||
			udev->speed == USB_SPEED_SUPER)
		i = 512;
	else
		i = udev->descriptor.bMaxPacketSize0;
3993
	if (usb_endpoint_maxp(&udev->ep0.desc) != i) {
3994
		if (udev->speed == USB_SPEED_LOW ||
L
Linus Torvalds 已提交
3995
				!(i == 8 || i == 16 || i == 32 || i == 64)) {
3996
			dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i);
L
Linus Torvalds 已提交
3997 3998 3999
			retval = -EMSGSIZE;
			goto fail;
		}
4000 4001 4002 4003
		if (udev->speed == USB_SPEED_FULL)
			dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
		else
			dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i);
L
Linus Torvalds 已提交
4004
		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
4005
		usb_ep0_reinit(udev);
L
Linus Torvalds 已提交
4006 4007 4008 4009
	}
  
	retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
	if (retval < (signed)sizeof(udev->descriptor)) {
4010 4011
		dev_err(&udev->dev, "device descriptor read/all, error %d\n",
			retval);
L
Linus Torvalds 已提交
4012 4013 4014 4015 4016
		if (retval >= 0)
			retval = -ENOMSG;
		goto fail;
	}

4017 4018
	if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) {
		retval = usb_get_bos_descriptor(udev);
4019
		if (!retval) {
4020
			udev->lpm_capable = usb_device_supports_lpm(udev);
4021 4022
			usb_set_lpm_parameters(udev);
		}
4023
	}
A
Andiry Xu 已提交
4024

L
Linus Torvalds 已提交
4025
	retval = 0;
4026 4027 4028
	/* notify HCD that we have a device connected and addressed */
	if (hcd->driver->update_device)
		hcd->driver->update_device(hcd, udev);
L
Linus Torvalds 已提交
4029
fail:
4030
	if (retval) {
L
Linus Torvalds 已提交
4031
		hub_port_disable(hub, port1, 0);
4032
		update_devnum(udev, devnum);	/* for disconnect processing */
4033
	}
4034
	mutex_unlock(&usb_address0_mutex);
L
Linus Torvalds 已提交
4035 4036 4037 4038 4039 4040 4041 4042 4043
	return retval;
}

static void
check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
{
	struct usb_qualifier_descriptor	*qual;
	int				status;

4044
	qual = kmalloc (sizeof *qual, GFP_KERNEL);
L
Linus Torvalds 已提交
4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055
	if (qual == NULL)
		return;

	status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
			qual, sizeof *qual);
	if (status == sizeof *qual) {
		dev_info(&udev->dev, "not running at top speed; "
			"connect to a high speed hub\n");
		/* hub LEDs are probably harder to miss than syslog */
		if (hub->has_indicators) {
			hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
D
David Howells 已提交
4056
			schedule_delayed_work (&hub->leds, 0);
L
Linus Torvalds 已提交
4057 4058
		}
	}
4059
	kfree(qual);
L
Linus Torvalds 已提交
4060 4061 4062 4063 4064 4065 4066
}

static unsigned
hub_power_remaining (struct usb_hub *hub)
{
	struct usb_device *hdev = hub->hdev;
	int remaining;
4067
	int port1;
L
Linus Torvalds 已提交
4068

4069
	if (!hub->limited_power)
L
Linus Torvalds 已提交
4070 4071
		return 0;

4072 4073
	remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
	for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
4074
		struct usb_device	*udev = hub->ports[port1 - 1]->child;
4075
		int			delta;
L
Linus Torvalds 已提交
4076 4077 4078 4079

		if (!udev)
			continue;

4080 4081
		/* Unconfigured devices may not use more than 100mA,
		 * or 8mA for OTG ports */
L
Linus Torvalds 已提交
4082
		if (udev->actconfig)
4083 4084 4085
			delta = udev->actconfig->desc.bMaxPower * 2;
		else if (port1 != udev->bus->otg_port || hdev->parent)
			delta = 100;
L
Linus Torvalds 已提交
4086
		else
4087 4088
			delta = 8;
		if (delta > hub->mA_per_port)
4089 4090 4091
			dev_warn(&udev->dev,
				 "%dmA is over %umA budget for port %d!\n",
				 delta, hub->mA_per_port, port1);
L
Linus Torvalds 已提交
4092 4093 4094
		remaining -= delta;
	}
	if (remaining < 0) {
4095 4096
		dev_warn(hub->intfdev, "%dmA over power budget!\n",
			- remaining);
L
Linus Torvalds 已提交
4097 4098 4099 4100 4101 4102 4103 4104 4105
		remaining = 0;
	}
	return remaining;
}

/* Handle physical or logical connection change events.
 * This routine is called when:
 * 	a port connection-change occurs;
 *	a port enable-change occurs (often caused by EMI);
4106
 *	usb_reset_and_verify_device() encounters changed descriptors (as from
L
Linus Torvalds 已提交
4107 4108 4109 4110 4111 4112 4113 4114
 *		a firmware download)
 * caller already locked the hub
 */
static void hub_port_connect_change(struct usb_hub *hub, int port1,
					u16 portstatus, u16 portchange)
{
	struct usb_device *hdev = hub->hdev;
	struct device *hub_dev = hub->intfdev;
4115
	struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
A
Alan Stern 已提交
4116 4117
	unsigned wHubCharacteristics =
			le16_to_cpu(hub->descriptor->wHubCharacteristics);
4118
	struct usb_device *udev;
L
Linus Torvalds 已提交
4119
	int status, i;
A
Alan Stern 已提交
4120

L
Linus Torvalds 已提交
4121 4122
	dev_dbg (hub_dev,
		"port %d, status %04x, change %04x, %s\n",
4123
		port1, portstatus, portchange, portspeed(hub, portstatus));
L
Linus Torvalds 已提交
4124 4125 4126 4127 4128 4129 4130 4131 4132

	if (hub->has_indicators) {
		set_port_led(hub, port1, HUB_LED_AUTO);
		hub->indicator[port1-1] = INDICATOR_AUTO;
	}

#ifdef	CONFIG_USB_OTG
	/* during HNP, don't repeat the debounce */
	if (hdev->bus->is_b_host)
A
Alan Stern 已提交
4133 4134
		portchange &= ~(USB_PORT_STAT_C_CONNECTION |
				USB_PORT_STAT_C_ENABLE);
L
Linus Torvalds 已提交
4135 4136
#endif

4137
	/* Try to resuscitate an existing device */
4138
	udev = hub->ports[port1 - 1]->child;
4139 4140 4141 4142 4143 4144 4145
	if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&
			udev->state != USB_STATE_NOTATTACHED) {
		usb_lock_device(udev);
		if (portstatus & USB_PORT_STAT_ENABLE) {
			status = 0;		/* Nothing to do */

#ifdef CONFIG_USB_SUSPEND
4146 4147
		} else if (udev->state == USB_STATE_SUSPENDED &&
				udev->persist_enabled) {
4148 4149 4150
			/* For a suspended device, treat this as a
			 * remote wakeup event.
			 */
4151
			status = usb_remote_wakeup(udev);
4152 4153 4154
#endif

		} else {
4155
			status = -ENODEV;	/* Don't resuscitate */
4156 4157 4158 4159 4160 4161 4162 4163 4164
		}
		usb_unlock_device(udev);

		if (status == 0) {
			clear_bit(port1, hub->change_bits);
			return;
		}
	}

A
Alan Stern 已提交
4165
	/* Disconnect any existing devices under this port */
4166
	if (udev)
4167
		usb_disconnect(&hub->ports[port1 - 1]->child);
A
Alan Stern 已提交
4168 4169
	clear_bit(port1, hub->change_bits);

4170 4171 4172 4173 4174 4175 4176
	/* We can forget about a "removed" device when there's a physical
	 * disconnect or the connect status changes.
	 */
	if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
			(portchange & USB_PORT_STAT_C_CONNECTION))
		clear_bit(port1, hub->removed_bits);

4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189
	if (portchange & (USB_PORT_STAT_C_CONNECTION |
				USB_PORT_STAT_C_ENABLE)) {
		status = hub_port_debounce(hub, port1);
		if (status < 0) {
			if (printk_ratelimit())
				dev_err(hub_dev, "connect-debounce failed, "
						"port %d disabled\n", port1);
			portstatus &= ~USB_PORT_STAT_CONNECTION;
		} else {
			portstatus = status;
		}
	}

4190 4191 4192 4193 4194 4195 4196
	if (hcd->phy && !hdev->parent) {
		if (portstatus & USB_PORT_STAT_CONNECTION)
			usb_phy_notify_connect(hcd->phy, port1);
		else
			usb_phy_notify_disconnect(hcd->phy, port1);
	}

4197 4198 4199 4200 4201
	/* Return now if debouncing failed or nothing is connected or
	 * the device was "removed".
	 */
	if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
			test_bit(port1, hub->removed_bits)) {
L
Linus Torvalds 已提交
4202 4203

		/* maybe switch power back on (e.g. root hub was reset) */
4204
		if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
4205
				&& !port_is_power_on(hub, portstatus))
L
Linus Torvalds 已提交
4206
			set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
4207

L
Linus Torvalds 已提交
4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226
		if (portstatus & USB_PORT_STAT_ENABLE)
  			goto done;
		return;
	}

	for (i = 0; i < SET_CONFIG_TRIES; i++) {

		/* reallocate for each attempt, since references
		 * to the previous one can escape in various ways
		 */
		udev = usb_alloc_dev(hdev, hdev->bus, port1);
		if (!udev) {
			dev_err (hub_dev,
				"couldn't allocate port %d usb_device\n",
				port1);
			goto done;
		}

		usb_set_device_state(udev, USB_STATE_POWERED);
4227
 		udev->bus_mA = hub->mA_per_port;
4228
		udev->level = hdev->level + 1;
4229
		udev->wusb = hub_is_wusb(hub);
4230

4231 4232
		/* Only USB 3.0 devices are connected to SuperSpeed hubs. */
		if (hub_is_superspeed(hub->hdev))
4233 4234 4235 4236
			udev->speed = USB_SPEED_SUPER;
		else
			udev->speed = USB_SPEED_UNKNOWN;

4237
		choose_devnum(udev);
4238 4239 4240
		if (udev->devnum <= 0) {
			status = -ENOTCONN;	/* Don't retry */
			goto loop;
4241 4242
		}

4243
		/* reset (non-USB 3.0 devices) and get descriptor */
L
Linus Torvalds 已提交
4244 4245 4246 4247
		status = hub_port_init(hub, udev, port1, i);
		if (status < 0)
			goto loop;

4248 4249 4250 4251
		usb_detect_quirks(udev);
		if (udev->quirks & USB_QUIRK_DELAY_INIT)
			msleep(1000);

L
Linus Torvalds 已提交
4252 4253 4254 4255 4256 4257 4258
		/* consecutive bus-powered hubs aren't reliable; they can
		 * violate the voltage drop budget.  if the new child has
		 * a "powered" LED, users should notice we didn't enable it
		 * (without reading syslog), even without per-port LEDs
		 * on the parent.
		 */
		if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
4259
				&& udev->bus_mA <= 100) {
L
Linus Torvalds 已提交
4260 4261 4262 4263
			u16	devstat;

			status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
					&devstat);
4264
			if (status < 2) {
L
Linus Torvalds 已提交
4265 4266 4267
				dev_dbg(&udev->dev, "get status %d ?\n", status);
				goto loop_disable;
			}
4268
			le16_to_cpus(&devstat);
L
Linus Torvalds 已提交
4269 4270 4271 4272 4273 4274 4275
			if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
				dev_err(&udev->dev,
					"can't connect bus-powered hub "
					"to this port\n");
				if (hub->has_indicators) {
					hub->indicator[port1-1] =
						INDICATOR_AMBER_BLINK;
D
David Howells 已提交
4276
					schedule_delayed_work (&hub->leds, 0);
L
Linus Torvalds 已提交
4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288
				}
				status = -ENOTCONN;	/* Don't retry */
				goto loop_disable;
			}
		}
 
		/* check for devices running slower than they could */
		if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
				&& udev->speed == USB_SPEED_FULL
				&& highspeed_hubs != 0)
			check_highspeed (hub, udev, port1);

4289
		/* Store the parent's children[] pointer.  At this point
L
Linus Torvalds 已提交
4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302
		 * udev becomes globally accessible, although presumably
		 * no one will look at it until hdev is unlocked.
		 */
		status = 0;

		/* We mustn't add new devices if the parent hub has
		 * been disconnected; we would race with the
		 * recursively_mark_NOTATTACHED() routine.
		 */
		spin_lock_irq(&device_state_lock);
		if (hdev->state == USB_STATE_NOTATTACHED)
			status = -ENOTCONN;
		else
4303
			hub->ports[port1 - 1]->child = udev;
L
Linus Torvalds 已提交
4304 4305 4306 4307 4308 4309 4310
		spin_unlock_irq(&device_state_lock);

		/* Run it through the hoops (find a driver, etc) */
		if (!status) {
			status = usb_new_device(udev);
			if (status) {
				spin_lock_irq(&device_state_lock);
4311
				hub->ports[port1 - 1]->child = NULL;
L
Linus Torvalds 已提交
4312 4313 4314 4315 4316 4317 4318 4319 4320
				spin_unlock_irq(&device_state_lock);
			}
		}

		if (status)
			goto loop_disable;

		status = hub_power_remaining(hub);
		if (status)
4321
			dev_dbg(hub_dev, "%dmA power budget left\n", status);
L
Linus Torvalds 已提交
4322 4323 4324 4325 4326 4327

		return;

loop_disable:
		hub_port_disable(hub, port1, 1);
loop:
4328
		usb_ep0_reinit(udev);
4329
		release_devnum(udev);
4330
		hub_free_dev(udev);
L
Linus Torvalds 已提交
4331
		usb_put_dev(udev);
4332
		if ((status == -ENOTCONN) || (status == -ENOTSUPP))
L
Linus Torvalds 已提交
4333 4334
			break;
	}
4335 4336 4337 4338 4339
	if (hub->hdev->parent ||
			!hcd->driver->port_handed_over ||
			!(hcd->driver->port_handed_over)(hcd, port1))
		dev_err(hub_dev, "unable to enumerate USB device on port %d\n",
				port1);
L
Linus Torvalds 已提交
4340 4341 4342
 
done:
	hub_port_disable(hub, port1, 1);
4343 4344
	if (hcd->driver->relinquish_port && !hub->hdev->parent)
		hcd->driver->relinquish_port(hcd, port1);
L
Linus Torvalds 已提交
4345 4346
}

4347 4348
/* Returns 1 if there was a remote wakeup and a connect status change. */
static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port,
4349
		u16 portstatus, u16 portchange)
4350 4351 4352 4353 4354 4355 4356
{
	struct usb_device *hdev;
	struct usb_device *udev;
	int connect_change = 0;
	int ret;

	hdev = hub->hdev;
4357
	udev = hub->ports[port - 1]->child;
4358 4359 4360 4361 4362 4363
	if (!hub_is_superspeed(hdev)) {
		if (!(portchange & USB_PORT_STAT_C_SUSPEND))
			return 0;
		clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND);
	} else {
		if (!udev || udev->state != USB_STATE_SUSPENDED ||
4364 4365
				 (portstatus & USB_PORT_STAT_LINK_STATE) !=
				 USB_SS_PORT_LS_U0)
4366 4367 4368
			return 0;
	}

4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386
	if (udev) {
		/* TRSMRCY = 10 msec */
		msleep(10);

		usb_lock_device(udev);
		ret = usb_remote_wakeup(udev);
		usb_unlock_device(udev);
		if (ret < 0)
			connect_change = 1;
	} else {
		ret = -ENODEV;
		hub_port_disable(hub, port, 1);
	}
	dev_dbg(hub->intfdev, "resume on port %d, status %d\n",
			port, ret);
	return connect_change;
}

L
Linus Torvalds 已提交
4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398
static void hub_events(void)
{
	struct list_head *tmp;
	struct usb_device *hdev;
	struct usb_interface *intf;
	struct usb_hub *hub;
	struct device *hub_dev;
	u16 hubstatus;
	u16 hubchange;
	u16 portstatus;
	u16 portchange;
	int i, ret;
4399
	int connect_change, wakeup_change;
L
Linus Torvalds 已提交
4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419

	/*
	 *  We restart the list every time to avoid a deadlock with
	 * deleting hubs downstream from this one. This should be
	 * safe since we delete the hub from the event list.
	 * Not the most efficient, but avoids deadlocks.
	 */
	while (1) {

		/* Grab the first entry at the beginning of the list */
		spin_lock_irq(&hub_event_lock);
		if (list_empty(&hub_event_list)) {
			spin_unlock_irq(&hub_event_lock);
			break;
		}

		tmp = hub_event_list.next;
		list_del_init(tmp);

		hub = list_entry(tmp, struct usb_hub, event_list);
4420 4421
		kref_get(&hub->kref);
		spin_unlock_irq(&hub_event_lock);
L
Linus Torvalds 已提交
4422

4423 4424 4425
		hdev = hub->hdev;
		hub_dev = hub->intfdev;
		intf = to_usb_interface(hub_dev);
4426
		dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
L
Linus Torvalds 已提交
4427 4428 4429 4430 4431
				hdev->state, hub->descriptor
					? hub->descriptor->bNbrPorts
					: 0,
				/* NOTE: expects max 15 ports... */
				(u16) hub->change_bits[0],
4432
				(u16) hub->event_bits[0]);
L
Linus Torvalds 已提交
4433 4434 4435

		/* Lock the device, then check to see if we were
		 * disconnected while waiting for the lock to succeed. */
4436
		usb_lock_device(hdev);
4437
		if (unlikely(hub->disconnected))
4438
			goto loop_disconnected;
L
Linus Torvalds 已提交
4439 4440 4441

		/* If the hub has died, clean up after it */
		if (hdev->state == USB_STATE_NOTATTACHED) {
4442
			hub->error = -ENODEV;
4443
			hub_quiesce(hub, HUB_DISCONNECT);
L
Linus Torvalds 已提交
4444 4445 4446
			goto loop;
		}

4447 4448 4449 4450 4451 4452
		/* Autoresume */
		ret = usb_autopm_get_interface(intf);
		if (ret) {
			dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
			goto loop;
		}
4453

4454
		/* If this is an inactive hub, do nothing */
L
Linus Torvalds 已提交
4455
		if (hub->quiescing)
4456
			goto loop_autopm;
L
Linus Torvalds 已提交
4457 4458 4459 4460 4461

		if (hub->error) {
			dev_dbg (hub_dev, "resetting for error %d\n",
				hub->error);

4462
			ret = usb_reset_device(hdev);
L
Linus Torvalds 已提交
4463 4464 4465
			if (ret) {
				dev_dbg (hub_dev,
					"error resetting hub: %d\n", ret);
4466
				goto loop_autopm;
L
Linus Torvalds 已提交
4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477
			}

			hub->nerrors = 0;
			hub->error = 0;
		}

		/* deal with port status changes */
		for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
			if (test_bit(i, hub->busy_bits))
				continue;
			connect_change = test_bit(i, hub->change_bits);
4478
			wakeup_change = test_and_clear_bit(i, hub->wakeup_bits);
L
Linus Torvalds 已提交
4479
			if (!test_and_clear_bit(i, hub->event_bits) &&
4480
					!connect_change && !wakeup_change)
L
Linus Torvalds 已提交
4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510
				continue;

			ret = hub_port_status(hub, i,
					&portstatus, &portchange);
			if (ret < 0)
				continue;

			if (portchange & USB_PORT_STAT_C_CONNECTION) {
				clear_port_feature(hdev, i,
					USB_PORT_FEAT_C_CONNECTION);
				connect_change = 1;
			}

			if (portchange & USB_PORT_STAT_C_ENABLE) {
				if (!connect_change)
					dev_dbg (hub_dev,
						"port %d enable change, "
						"status %08x\n",
						i, portstatus);
				clear_port_feature(hdev, i,
					USB_PORT_FEAT_C_ENABLE);

				/*
				 * EM interference sometimes causes badly
				 * shielded USB devices to be shutdown by
				 * the hub, this hack enables them again.
				 * Works at least with mouse driver. 
				 */
				if (!(portstatus & USB_PORT_STAT_ENABLE)
				    && !connect_change
4511
				    && hub->ports[i - 1]->child) {
L
Linus Torvalds 已提交
4512 4513 4514 4515 4516 4517 4518 4519 4520
					dev_err (hub_dev,
					    "port %i "
					    "disabled by hub (EMI?), "
					    "re-enabling...\n",
						i);
					connect_change = 1;
				}
			}

4521 4522
			if (hub_handle_remote_wakeup(hub, i,
						portstatus, portchange))
4523
				connect_change = 1;
4524

L
Linus Torvalds 已提交
4525
			if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
4526 4527 4528 4529 4530
				u16 status = 0;
				u16 unused;

				dev_dbg(hub_dev, "over-current change on port "
					"%d\n", i);
L
Linus Torvalds 已提交
4531 4532
				clear_port_feature(hdev, i,
					USB_PORT_FEAT_C_OVER_CURRENT);
4533
				msleep(100);	/* Cool down */
4534
				hub_power_on(hub, true);
4535 4536 4537 4538
				hub_port_status(hub, i, &status, &unused);
				if (status & USB_PORT_STAT_OVERCURRENT)
					dev_err(hub_dev, "over-current "
						"condition on port %d\n", i);
L
Linus Torvalds 已提交
4539 4540 4541 4542 4543 4544 4545 4546 4547
			}

			if (portchange & USB_PORT_STAT_C_RESET) {
				dev_dbg (hub_dev,
					"reset change on port %d\n",
					i);
				clear_port_feature(hdev, i,
					USB_PORT_FEAT_C_RESET);
			}
4548 4549 4550 4551 4552 4553 4554 4555
			if ((portchange & USB_PORT_STAT_C_BH_RESET) &&
					hub_is_superspeed(hub->hdev)) {
				dev_dbg(hub_dev,
					"warm reset change on port %d\n",
					i);
				clear_port_feature(hdev, i,
					USB_PORT_FEAT_C_BH_PORT_RESET);
			}
J
John Youn 已提交
4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566
			if (portchange & USB_PORT_STAT_C_LINK_STATE) {
				clear_port_feature(hub->hdev, i,
						USB_PORT_FEAT_C_PORT_LINK_STATE);
			}
			if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) {
				dev_warn(hub_dev,
					"config error on port %d\n",
					i);
				clear_port_feature(hub->hdev, i,
						USB_PORT_FEAT_C_PORT_CONFIG_ERROR);
			}
L
Linus Torvalds 已提交
4567

4568 4569 4570
			/* Warm reset a USB3 protocol port if it's in
			 * SS.Inactive state.
			 */
4571
			if (hub_port_warm_reset_required(hub, portstatus)) {
4572
				dev_dbg(hub_dev, "warm reset port %d\n", i);
A
Andiry Xu 已提交
4573 4574
				hub_port_reset(hub, i, NULL,
						HUB_BH_RESET_TIME, true);
4575 4576
			}

L
Linus Torvalds 已提交
4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590
			if (connect_change)
				hub_port_connect_change(hub, i,
						portstatus, portchange);
		} /* end for i */

		/* deal with hub status changes */
		if (test_and_clear_bit(0, hub->event_bits) == 0)
			;	/* do nothing */
		else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
			dev_err (hub_dev, "get_hub_status failed\n");
		else {
			if (hubchange & HUB_CHANGE_LOCAL_POWER) {
				dev_dbg (hub_dev, "power change\n");
				clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
4591 4592 4593
				if (hubstatus & HUB_STATUS_LOCAL_POWER)
					/* FIXME: Is this always true? */
					hub->limited_power = 1;
4594 4595
				else
					hub->limited_power = 0;
L
Linus Torvalds 已提交
4596 4597
			}
			if (hubchange & HUB_CHANGE_OVERCURRENT) {
4598 4599 4600 4601
				u16 status = 0;
				u16 unused;

				dev_dbg(hub_dev, "over-current change\n");
L
Linus Torvalds 已提交
4602
				clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
4603
				msleep(500);	/* Cool down */
4604
                        	hub_power_on(hub, true);
4605 4606 4607 4608
				hub_hub_status(hub, &status, &unused);
				if (status & HUB_STATUS_OVERCURRENT)
					dev_err(hub_dev, "over-current "
						"condition\n");
L
Linus Torvalds 已提交
4609 4610 4611
			}
		}

4612 4613 4614 4615 4616 4617 4618 4619
 loop_autopm:
		/* Balance the usb_autopm_get_interface() above */
		usb_autopm_put_interface_no_suspend(intf);
 loop:
		/* Balance the usb_autopm_get_interface_no_resume() in
		 * kick_khubd() and allow autosuspend.
		 */
		usb_autopm_put_interface(intf);
4620
 loop_disconnected:
L
Linus Torvalds 已提交
4621
		usb_unlock_device(hdev);
4622
		kref_put(&hub->kref, hub_release);
L
Linus Torvalds 已提交
4623 4624 4625 4626 4627 4628

        } /* end while (1) */
}

static int hub_thread(void *__unused)
{
4629 4630 4631 4632 4633
	/* khubd needs to be freezable to avoid intefering with USB-PERSIST
	 * port handover.  Otherwise it might see that a full-speed device
	 * was gone before the EHCI controller had handed its port over to
	 * the companion full-speed controller.
	 */
4634
	set_freezable();
4635

L
Linus Torvalds 已提交
4636 4637
	do {
		hub_events();
4638
		wait_event_freezable(khubd_wait,
4639 4640 4641
				!list_empty(&hub_event_list) ||
				kthread_should_stop());
	} while (!kthread_should_stop() || !list_empty(&hub_event_list));
L
Linus Torvalds 已提交
4642

4643 4644
	pr_debug("%s: khubd exiting\n", usbcore_name);
	return 0;
L
Linus Torvalds 已提交
4645 4646
}

4647
static const struct usb_device_id hub_id_table[] = {
L
Linus Torvalds 已提交
4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662
    { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
      .bDeviceClass = USB_CLASS_HUB},
    { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
      .bInterfaceClass = USB_CLASS_HUB},
    { }						/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, hub_id_table);

static struct usb_driver hub_driver = {
	.name =		"hub",
	.probe =	hub_probe,
	.disconnect =	hub_disconnect,
	.suspend =	hub_suspend,
	.resume =	hub_resume,
A
Alan Stern 已提交
4663
	.reset_resume =	hub_reset_resume,
4664 4665
	.pre_reset =	hub_pre_reset,
	.post_reset =	hub_post_reset,
4666
	.unlocked_ioctl = hub_ioctl,
L
Linus Torvalds 已提交
4667
	.id_table =	hub_id_table,
4668
	.supports_autosuspend =	1,
L
Linus Torvalds 已提交
4669 4670 4671 4672 4673 4674 4675 4676 4677 4678
};

int usb_hub_init(void)
{
	if (usb_register(&hub_driver) < 0) {
		printk(KERN_ERR "%s: can't register hub driver\n",
			usbcore_name);
		return -1;
	}

4679 4680
	khubd_task = kthread_run(hub_thread, NULL, "khubd");
	if (!IS_ERR(khubd_task))
L
Linus Torvalds 已提交
4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691
		return 0;

	/* Fall through if kernel_thread failed */
	usb_deregister(&hub_driver);
	printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);

	return -1;
}

void usb_hub_cleanup(void)
{
4692
	kthread_stop(khubd_task);
L
Linus Torvalds 已提交
4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703

	/*
	 * Hub resources are freed for us by usb_deregister. It calls
	 * usb_driver_purge on every device which in turn calls that
	 * devices disconnect function if it is using this driver.
	 * The hub_disconnect function takes care of releasing the
	 * individual hub resources. -greg
	 */
	usb_deregister(&hub_driver);
} /* usb_hub_cleanup() */

4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726
static int descriptors_changed(struct usb_device *udev,
		struct usb_device_descriptor *old_device_descriptor)
{
	int		changed = 0;
	unsigned	index;
	unsigned	serial_len = 0;
	unsigned	len;
	unsigned	old_length;
	int		length;
	char		*buf;

	if (memcmp(&udev->descriptor, old_device_descriptor,
			sizeof(*old_device_descriptor)) != 0)
		return 1;

	/* Since the idVendor, idProduct, and bcdDevice values in the
	 * device descriptor haven't changed, we will assume the
	 * Manufacturer and Product strings haven't changed either.
	 * But the SerialNumber string could be different (e.g., a
	 * different flash card of the same brand).
	 */
	if (udev->serial)
		serial_len = strlen(udev->serial) + 1;
L
Linus Torvalds 已提交
4727

4728
	len = serial_len;
L
Linus Torvalds 已提交
4729
	for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
4730 4731
		old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
		len = max(len, old_length);
L
Linus Torvalds 已提交
4732
	}
4733

O
Oliver Neukum 已提交
4734
	buf = kmalloc(len, GFP_NOIO);
L
Linus Torvalds 已提交
4735 4736 4737 4738 4739 4740
	if (buf == NULL) {
		dev_err(&udev->dev, "no mem to re-read configs after reset\n");
		/* assume the worst */
		return 1;
	}
	for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
4741
		old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
L
Linus Torvalds 已提交
4742 4743
		length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
				old_length);
4744
		if (length != old_length) {
L
Linus Torvalds 已提交
4745 4746
			dev_dbg(&udev->dev, "config index %d, error %d\n",
					index, length);
4747
			changed = 1;
L
Linus Torvalds 已提交
4748 4749 4750 4751 4752
			break;
		}
		if (memcmp (buf, udev->rawdescriptors[index], old_length)
				!= 0) {
			dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
4753 4754 4755 4756
				index,
				((struct usb_config_descriptor *) buf)->
					bConfigurationValue);
			changed = 1;
L
Linus Torvalds 已提交
4757 4758 4759
			break;
		}
	}
4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773

	if (!changed && serial_len) {
		length = usb_string(udev, udev->descriptor.iSerialNumber,
				buf, serial_len);
		if (length + 1 != serial_len) {
			dev_dbg(&udev->dev, "serial string error %d\n",
					length);
			changed = 1;
		} else if (memcmp(buf, udev->serial, length) != 0) {
			dev_dbg(&udev->dev, "serial string changed\n");
			changed = 1;
		}
	}

L
Linus Torvalds 已提交
4774
	kfree(buf);
4775
	return changed;
L
Linus Torvalds 已提交
4776 4777 4778
}

/**
4779
 * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
L
Linus Torvalds 已提交
4780 4781
 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
 *
4782 4783
 * WARNING - don't use this routine to reset a composite device
 * (one with multiple interfaces owned by separate drivers)!
4784
 * Use usb_reset_device() instead.
L
Linus Torvalds 已提交
4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801
 *
 * Do a port reset, reassign the device's address, and establish its
 * former operating configuration.  If the reset fails, or the device's
 * descriptors change from their values before the reset, or the original
 * configuration and altsettings cannot be restored, a flag will be set
 * telling khubd to pretend the device has been disconnected and then
 * re-connected.  All drivers will be unbound, and the device will be
 * re-enumerated and probed all over again.
 *
 * Returns 0 if the reset succeeded, -ENODEV if the device has been
 * flagged for logical disconnection, or some other negative error code
 * if the reset wasn't even attempted.
 *
 * The caller must own the device lock.  For example, it's safe to use
 * this from a driver probe() routine after downloading new firmware.
 * For calls that might not occur during probe(), drivers should lock
 * the device using usb_lock_device_for_reset().
A
Alan Stern 已提交
4802 4803 4804 4805 4806
 *
 * Locking exception: This routine may also be called from within an
 * autoresume handler.  Such usage won't conflict with other tasks
 * holding the device lock because these tasks should always call
 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
L
Linus Torvalds 已提交
4807
 */
4808
static int usb_reset_and_verify_device(struct usb_device *udev)
L
Linus Torvalds 已提交
4809 4810 4811
{
	struct usb_device		*parent_hdev = udev->parent;
	struct usb_hub			*parent_hub;
4812
	struct usb_hcd			*hcd = bus_to_hcd(udev->bus);
L
Linus Torvalds 已提交
4813
	struct usb_device_descriptor	descriptor = udev->descriptor;
4814 4815
	int 				i, ret = 0;
	int				port1 = udev->portnum;
L
Linus Torvalds 已提交
4816 4817 4818 4819 4820 4821 4822 4823 4824

	if (udev->state == USB_STATE_NOTATTACHED ||
			udev->state == USB_STATE_SUSPENDED) {
		dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
				udev->state);
		return -EINVAL;
	}

	if (!parent_hdev) {
4825
		/* this requires hcd-specific logic; see ohci_restart() */
4826
		dev_dbg(&udev->dev, "%s for root hub!\n", __func__);
L
Linus Torvalds 已提交
4827 4828 4829 4830
		return -EISDIR;
	}
	parent_hub = hdev_to_hub(parent_hdev);

4831 4832 4833 4834
	/* Disable LPM and LTM while we reset the device and reinstall the alt
	 * settings.  Device-initiated LPM settings, and system exit latency
	 * settings are cleared when the device is reset, so we have to set
	 * them up again.
4835 4836 4837 4838 4839 4840
	 */
	ret = usb_unlocked_disable_lpm(udev);
	if (ret) {
		dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__);
		goto re_enumerate;
	}
4841 4842 4843 4844 4845 4846
	ret = usb_disable_ltm(udev);
	if (ret) {
		dev_err(&udev->dev, "%s Failed to disable LTM\n.",
				__func__);
		goto re_enumerate;
	}
4847

L
Linus Torvalds 已提交
4848 4849 4850 4851 4852
	set_bit(port1, parent_hub->busy_bits);
	for (i = 0; i < SET_CONFIG_TRIES; ++i) {

		/* ep0 maxpacket size may change; let the HCD know about it.
		 * Other endpoints will be handled by re-enumeration. */
4853
		usb_ep0_reinit(udev);
L
Linus Torvalds 已提交
4854
		ret = hub_port_init(parent_hub, udev, port1, i);
4855
		if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
L
Linus Torvalds 已提交
4856 4857 4858
			break;
	}
	clear_bit(port1, parent_hub->busy_bits);
4859

L
Linus Torvalds 已提交
4860 4861 4862 4863
	if (ret < 0)
		goto re_enumerate;
 
	/* Device might have changed firmware (DFU or similar) */
4864
	if (descriptors_changed(udev, &descriptor)) {
L
Linus Torvalds 已提交
4865 4866 4867 4868
		dev_info(&udev->dev, "device firmware changed\n");
		udev->descriptor = descriptor;	/* for disconnect() calls */
		goto re_enumerate;
  	}
4869 4870

	/* Restore the device's previous configuration */
L
Linus Torvalds 已提交
4871 4872
	if (!udev->actconfig)
		goto done;
4873

4874
	mutex_lock(hcd->bandwidth_mutex);
4875 4876 4877 4878 4879
	ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL);
	if (ret < 0) {
		dev_warn(&udev->dev,
				"Busted HC?  Not enough HCD resources for "
				"old configuration.\n");
4880
		mutex_unlock(hcd->bandwidth_mutex);
4881 4882
		goto re_enumerate;
	}
L
Linus Torvalds 已提交
4883 4884 4885 4886 4887 4888 4889 4890
	ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
			USB_REQ_SET_CONFIGURATION, 0,
			udev->actconfig->desc.bConfigurationValue, 0,
			NULL, 0, USB_CTRL_SET_TIMEOUT);
	if (ret < 0) {
		dev_err(&udev->dev,
			"can't restore configuration #%d (error=%d)\n",
			udev->actconfig->desc.bConfigurationValue, ret);
4891
		mutex_unlock(hcd->bandwidth_mutex);
L
Linus Torvalds 已提交
4892 4893
		goto re_enumerate;
  	}
4894
	mutex_unlock(hcd->bandwidth_mutex);
L
Linus Torvalds 已提交
4895 4896
	usb_set_device_state(udev, USB_STATE_CONFIGURED);

4897 4898 4899 4900 4901 4902
	/* Put interfaces back into the same altsettings as before.
	 * Don't bother to send the Set-Interface request for interfaces
	 * that were already in altsetting 0; besides being unnecessary,
	 * many devices can't handle it.  Instead just reset the host-side
	 * endpoint state.
	 */
L
Linus Torvalds 已提交
4903
	for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
4904 4905
		struct usb_host_config *config = udev->actconfig;
		struct usb_interface *intf = config->interface[i];
L
Linus Torvalds 已提交
4906 4907 4908
		struct usb_interface_descriptor *desc;

		desc = &intf->cur_altsetting->desc;
4909 4910 4911 4912 4913
		if (desc->bAlternateSetting == 0) {
			usb_disable_interface(udev, intf, true);
			usb_enable_interface(udev, intf, true);
			ret = 0;
		} else {
4914 4915 4916
			/* Let the bandwidth allocation function know that this
			 * device has been reset, and it will have to use
			 * alternate setting 0 as the current alternate setting.
4917
			 */
4918
			intf->resetting_device = 1;
4919 4920
			ret = usb_set_interface(udev, desc->bInterfaceNumber,
					desc->bAlternateSetting);
4921
			intf->resetting_device = 0;
4922
		}
L
Linus Torvalds 已提交
4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933
		if (ret < 0) {
			dev_err(&udev->dev, "failed to restore interface %d "
				"altsetting %d (error=%d)\n",
				desc->bInterfaceNumber,
				desc->bAlternateSetting,
				ret);
			goto re_enumerate;
		}
	}

done:
4934
	/* Now that the alt settings are re-installed, enable LTM and LPM. */
4935
	usb_unlocked_enable_lpm(udev);
4936
	usb_enable_ltm(udev);
L
Linus Torvalds 已提交
4937 4938 4939
	return 0;
 
re_enumerate:
4940
	/* LPM state doesn't matter when we're about to destroy the device. */
L
Linus Torvalds 已提交
4941 4942 4943
	hub_port_logical_disconnect(parent_hub, port1);
	return -ENODEV;
}
4944 4945

/**
4946
 * usb_reset_device - warn interface drivers and perform a USB port reset
4947 4948 4949 4950 4951 4952
 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
 *
 * Warns all drivers bound to registered interfaces (using their pre_reset
 * method), performs the port reset, and then lets the drivers know that
 * the reset is over (using their post_reset method).
 *
4953
 * Return value is the same as for usb_reset_and_verify_device().
4954 4955 4956 4957 4958
 *
 * The caller must own the device lock.  For example, it's safe to use
 * this from a driver probe() routine after downloading new firmware.
 * For calls that might not occur during probe(), drivers should lock
 * the device using usb_lock_device_for_reset().
4959 4960 4961 4962 4963
 *
 * If an interface is currently being probed or disconnected, we assume
 * its driver knows how to handle resets.  For all other interfaces,
 * if the driver doesn't have pre_reset and post_reset methods then
 * we attempt to unbind it and rebind afterward.
4964
 */
4965
int usb_reset_device(struct usb_device *udev)
4966 4967
{
	int ret;
4968
	int i;
4969 4970 4971 4972 4973 4974 4975 4976 4977
	struct usb_host_config *config = udev->actconfig;

	if (udev->state == USB_STATE_NOTATTACHED ||
			udev->state == USB_STATE_SUSPENDED) {
		dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
				udev->state);
		return -EINVAL;
	}

4978
	/* Prevent autosuspend during the reset */
4979
	usb_autoresume_device(udev);
4980

4981 4982
	if (config) {
		for (i = 0; i < config->desc.bNumInterfaces; ++i) {
4983 4984
			struct usb_interface *cintf = config->interface[i];
			struct usb_driver *drv;
4985
			int unbind = 0;
4986 4987

			if (cintf->dev.driver) {
4988
				drv = to_usb_driver(cintf->dev.driver);
4989 4990 4991 4992 4993 4994 4995
				if (drv->pre_reset && drv->post_reset)
					unbind = (drv->pre_reset)(cintf);
				else if (cintf->condition ==
						USB_INTERFACE_BOUND)
					unbind = 1;
				if (unbind)
					usb_forced_unbind_intf(cintf);
4996 4997 4998 4999
			}
		}
	}

5000
	ret = usb_reset_and_verify_device(udev);
5001 5002 5003

	if (config) {
		for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
5004 5005
			struct usb_interface *cintf = config->interface[i];
			struct usb_driver *drv;
5006
			int rebind = cintf->needs_binding;
5007

5008
			if (!rebind && cintf->dev.driver) {
5009 5010
				drv = to_usb_driver(cintf->dev.driver);
				if (drv->post_reset)
5011 5012 5013 5014
					rebind = (drv->post_reset)(cintf);
				else if (cintf->condition ==
						USB_INTERFACE_BOUND)
					rebind = 1;
5015
			}
5016
			if (ret == 0 && rebind)
5017
				usb_rebind_intf(cintf);
5018 5019 5020
		}
	}

5021
	usb_autosuspend_device(udev);
5022 5023
	return ret;
}
5024
EXPORT_SYMBOL_GPL(usb_reset_device);
5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065 5066 5067


/**
 * usb_queue_reset_device - Reset a USB device from an atomic context
 * @iface: USB interface belonging to the device to reset
 *
 * This function can be used to reset a USB device from an atomic
 * context, where usb_reset_device() won't work (as it blocks).
 *
 * Doing a reset via this method is functionally equivalent to calling
 * usb_reset_device(), except for the fact that it is delayed to a
 * workqueue. This means that any drivers bound to other interfaces
 * might be unbound, as well as users from usbfs in user space.
 *
 * Corner cases:
 *
 * - Scheduling two resets at the same time from two different drivers
 *   attached to two different interfaces of the same device is
 *   possible; depending on how the driver attached to each interface
 *   handles ->pre_reset(), the second reset might happen or not.
 *
 * - If a driver is unbound and it had a pending reset, the reset will
 *   be cancelled.
 *
 * - This function can be called during .probe() or .disconnect()
 *   times. On return from .disconnect(), any pending resets will be
 *   cancelled.
 *
 * There is no no need to lock/unlock the @reset_ws as schedule_work()
 * does its own.
 *
 * NOTE: We don't do any reference count tracking because it is not
 *     needed. The lifecycle of the work_struct is tied to the
 *     usb_interface. Before destroying the interface we cancel the
 *     work_struct, so the fact that work_struct is queued and or
 *     running means the interface (and thus, the device) exist and
 *     are referenced.
 */
void usb_queue_reset_device(struct usb_interface *iface)
{
	schedule_work(&iface->reset_ws);
}
EXPORT_SYMBOL_GPL(usb_queue_reset_device);
5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091

/**
 * usb_hub_find_child - Get the pointer of child device
 * attached to the port which is specified by @port1.
 * @hdev: USB device belonging to the usb hub
 * @port1: port num to indicate which port the child device
 *	is attached to.
 *
 * USB drivers call this function to get hub's child device
 * pointer.
 *
 * Return NULL if input param is invalid and
 * child's usb_device pointer if non-NULL.
 */
struct usb_device *usb_hub_find_child(struct usb_device *hdev,
		int port1)
{
	struct usb_hub *hub = hdev_to_hub(hdev);

	if (port1 < 1 || port1 > hdev->maxchild)
		return NULL;
	return hub->ports[port1 - 1]->child;
}
EXPORT_SYMBOL_GPL(usb_hub_find_child);
5092

5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122
/**
 * usb_set_hub_port_connect_type - set hub port connect type.
 * @hdev: USB device belonging to the usb hub
 * @port1: port num of the port
 * @type: connect type of the port
 */
void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1,
	enum usb_port_connect_type type)
{
	struct usb_hub *hub = hdev_to_hub(hdev);

	hub->ports[port1 - 1]->connect_type = type;
}

/**
 * usb_get_hub_port_connect_type - Get the port's connect type
 * @hdev: USB device belonging to the usb hub
 * @port1: port num of the port
 *
 * Return connect type of the port and if input params are
 * invalid, return USB_PORT_CONNECT_TYPE_UNKNOWN.
 */
enum usb_port_connect_type
usb_get_hub_port_connect_type(struct usb_device *hdev, int port1)
{
	struct usb_hub *hub = hdev_to_hub(hdev);

	return hub->ports[port1 - 1]->connect_type;
}

5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139
#ifdef CONFIG_ACPI
/**
 * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle
 * @hdev: USB device belonging to the usb hub
 * @port1: port num of the port
 *
 * Return port's acpi handle if successful, NULL if params are
 * invaild.
 */
acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev,
	int port1)
{
	struct usb_hub *hub = hdev_to_hub(hdev);

	return DEVICE_ACPI_HANDLE(&hub->ports[port1 - 1]->dev);
}
#endif