hub.c 81.8 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/smp_lock.h>
#include <linux/ioctl.h>
#include <linux/usb.h>
#include <linux/usbdevice_fs.h>
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#include <linux/kthread.h>
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#include <linux/mutex.h>
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#include <asm/semaphore.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>

#include "usb.h"
#include "hcd.h"
#include "hub.h"

/* 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 */
static int blinkenlights = 0;
module_param (blinkenlights, bool, S_IRUGO);
MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");

/*
 * 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.
 */
static int old_scheme_first = 0;
module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(old_scheme_first,
		 "start with the old device initialization scheme");

static int use_both_schemes = 1;
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");


#ifdef	DEBUG
static inline char *portspeed (int portstatus)
{
	if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
    		return "480 Mb/s";
	else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
		return "1.5 Mb/s";
	else
		return "12 Mb/s";
}
#endif

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

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

	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,
			USB_DT_HUB << 8, 0, data, size,
			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)

static void led_work (void *__hub)
{
	struct usb_hub		*hub = __hub;
	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;

	for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
		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;

	for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
		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;
}

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

	spin_lock_irqsave(&hub_event_lock, flags);
	if (list_empty(&hub->event_list)) {
		list_add_tail(&hub->event_list, &hub_event_list);
		wake_up(&khubd_wait);
	}
	spin_unlock_irqrestore(&hub_event_lock, flags);
}

void usb_kick_khubd(struct usb_device *hdev)
{
	kick_khubd(hdev_to_hub(hdev));
}


/* completion function, fires on port status changes and various faults */
static void hub_irq(struct urb *urb, struct pt_regs *regs)
{
	struct usb_hub *hub = (struct usb_hub *)urb->context;
	int status;
	int i;
	unsigned long bits;

	switch (urb->status) {
	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 */
		dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
		if ((++hub->nerrors < 10) || hub->error)
			goto resubmit;
		hub->error = urb->status;
		/* FALL THROUGH */
	
	/* 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)
{
	return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
			       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.
 */
static void hub_tt_kevent (void *arg)
{
	struct usb_hub		*hub = arg;
	unsigned long		flags;

	spin_lock_irqsave (&hub->tt.lock, flags);
	while (!list_empty (&hub->tt.clear_list)) {
		struct list_head	*temp;
		struct usb_tt_clear	*clear;
		struct usb_device	*hdev = hub->hdev;
		int			status;

		temp = hub->tt.clear_list.next;
		clear = list_entry (temp, struct usb_tt_clear, clear_list);
		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);
		spin_lock_irqsave (&hub->tt.lock, flags);

		if (status)
			dev_err (&hdev->dev,
				"clear tt %d (%04x) error %d\n",
				clear->tt, clear->devinfo, status);
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		kfree(clear);
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	}
	spin_unlock_irqrestore (&hub->tt.lock, flags);
}

/**
 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
 * @udev: the device whose split transaction failed
 * @pipe: identifies the endpoint of the failed transaction
 *
 * 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.
 */
void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
{
	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.
	 */
	if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) {
		dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
		/* FIXME recover somehow ... RESET_TT? */
		return;
	}

	/* 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;
	
	/* tell keventd to clear state for this TT */
	spin_lock_irqsave (&tt->lock, flags);
	list_add_tail (&clear->clear_list, &tt->clear_list);
	schedule_work (&tt->kevent);
	spin_unlock_irqrestore (&tt->lock, flags);
}

static void hub_power_on(struct usb_hub *hub)
{
	int port1;
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	unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
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	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");
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	else
		dev_dbg(hub->intfdev, "trying to enable port power on "
				"non-switchable hub\n");
	for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
		set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
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	/* Wait at least 100 msec for power to become stable */
	msleep(max(pgood_delay, (unsigned) 100));
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}

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static inline void __hub_quiesce(struct usb_hub *hub)
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{
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	/* (nonblocking) khubd and related activity won't re-trigger */
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	hub->quiescing = 1;
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	hub->activating = 0;
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	hub->resume_root_hub = 0;
}

static void hub_quiesce(struct usb_hub *hub)
{
	/* (blocking) stop khubd and related activity */
	__hub_quiesce(hub);
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	usb_kill_urb(hub->urb);
	if (hub->has_indicators)
		cancel_delayed_work(&hub->leds);
	if (hub->has_indicators || hub->tt.hub)
		flush_scheduled_work();
}

static void hub_activate(struct usb_hub *hub)
{
	int	status;

	hub->quiescing = 0;
	hub->activating = 1;
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	hub->resume_root_hub = 0;
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	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 ASAP */
	kick_khubd(hub);
}

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

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

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

	if (hdev->children[port1-1] && set_state) {
		usb_set_device_state(hdev->children[port1-1],
				USB_STATE_NOTATTACHED);
	}
	ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
	if (ret)
		dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
			port1, ret);

	return ret;
}

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/* caller has locked the hub device */
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static void hub_pre_reset(struct usb_interface *intf)
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{
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	struct usb_hub *hub = usb_get_intfdata(intf);
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	struct usb_device *hdev = hub->hdev;
	int port1;

	for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
		if (hdev->children[port1 - 1]) {
			usb_disconnect(&hdev->children[port1 - 1]);
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			if (hub->error == 0)
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				hub_port_disable(hub, port1, 0);
		}
	}
	hub_quiesce(hub);
}

/* caller has locked the hub device */
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static void hub_post_reset(struct usb_interface *intf)
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{
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	struct usb_hub *hub = usb_get_intfdata(intf);

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	hub_activate(hub);
	hub_power_on(hub);
}


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static int hub_configure(struct usb_hub *hub,
	struct usb_endpoint_descriptor *endpoint)
{
	struct usb_device *hdev = hub->hdev;
	struct device *hub_dev = hub->intfdev;
	u16 hubstatus, hubchange;
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	u16 wHubCharacteristics;
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	unsigned int pipe;
	int maxp, ret;
	char *message;

	hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
			&hub->buffer_dma);
	if (!hub->buffer) {
		message = "can't allocate hub irq buffer";
		ret = -ENOMEM;
		goto fail;
	}

	hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
	if (!hub->status) {
		message = "can't kmalloc hub status buffer";
		ret = -ENOMEM;
		goto fail;
	}

	hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
	if (!hub->descriptor) {
		message = "can't kmalloc 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.
	 */
	ret = get_hub_descriptor(hdev, hub->descriptor,
			sizeof(*hub->descriptor));
	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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	wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
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	if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
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		int	i;
		char	portstr [USB_MAXCHILDREN + 1];

		for (i = 0; i < hdev->maxchild; i++)
			portstr[i] = hub->descriptor->DeviceRemovable
				    [((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");

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	switch (wHubCharacteristics & HUB_CHAR_LPSM) {
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		case 0x00:
			dev_dbg(hub_dev, "ganged power switching\n");
			break;
		case 0x01:
			dev_dbg(hub_dev, "individual port power switching\n");
			break;
		case 0x02:
		case 0x03:
			dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
			break;
	}

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	switch (wHubCharacteristics & HUB_CHAR_OCPM) {
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		case 0x00:
			dev_dbg(hub_dev, "global over-current protection\n");
			break;
		case 0x08:
			dev_dbg(hub_dev, "individual port over-current protection\n");
			break;
		case 0x10:
		case 0x18:
			dev_dbg(hub_dev, "no over-current protection\n");
                        break;
	}

	spin_lock_init (&hub->tt.lock);
	INIT_LIST_HEAD (&hub->tt.clear_list);
	INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
	switch (hdev->descriptor.bDeviceProtocol) {
		case 0:
			break;
		case 1:
			dev_dbg(hub_dev, "Single TT\n");
			hub->tt.hub = hdev;
			break;
		case 2:
			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;
		default:
			dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
				hdev->descriptor.bDeviceProtocol);
			break;
	}

672
	/* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
673
	switch (wHubCharacteristics & HUB_CHAR_TTTT) {
674 675 676 677 678 679 680
		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);
			}
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			break;
682 683 684 685 686
		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);
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			break;
688 689 690 691 692
		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);
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			break;
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		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);
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			break;
	}

	/* probe() zeroes hub->indicator[] */
703
	if (wHubCharacteristics & HUB_CHAR_PORTIND) {
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		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);
715
	if (ret < 2) {
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		message = "can't get hub status";
		goto fail;
	}
719 720
	le16_to_cpus(&hubstatus);
	if (hdev == hdev->bus->root_hub) {
721 722 723 724 725 726
		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;
		}
727
	} else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
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		dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
			hub->descriptor->bHubContrCurrent);
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		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;
745
	}
746 747 748
	if (hub->mA_per_port < 500)
		dev_dbg(hub_dev, "%umA bus power budget for each child\n",
				hub->mA_per_port);
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	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");

762
	if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
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		dev_dbg(hub_dev, "%sover-current condition exists\n",
			(hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");

	/* set up the interrupt endpoint */
	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) {
		message = "couldn't allocate interrupt urb";
		ret = -ENOMEM;
		goto fail;
	}

	usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
		hub, endpoint->bInterval);
	hub->urb->transfer_dma = hub->buffer_dma;
	hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

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

	hub_power_on(hub);
	hub_activate(hub);
	return 0;

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

static unsigned highspeed_hubs;

static void hub_disconnect(struct usb_interface *intf)
{
	struct usb_hub *hub = usb_get_intfdata (intf);
	struct usb_device *hdev;

807 808 809 810
	/* Disconnect all children and quiesce the hub */
	hub->error = 0;
	hub_pre_reset(intf);

811
	usb_set_intfdata (intf, NULL);
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	hdev = hub->hdev;

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

	usb_free_urb(hub->urb);
	hub->urb = NULL;

	spin_lock_irq(&hub_event_lock);
	list_del_init(&hub->event_list);
	spin_unlock_irq(&hub_event_lock);

824 825
	kfree(hub->descriptor);
	hub->descriptor = NULL;
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	kfree(hub->status);
	hub->status = NULL;
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	if (hub->buffer) {
		usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
				hub->buffer_dma);
		hub->buffer = NULL;
	}

836
	kfree(hub);
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}

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);

849 850 851 852 853 854 855
#ifdef	CONFIG_USB_OTG_BLACKLIST_HUB
	if (hdev->parent) {
		dev_warn(&intf->dev, "ignoring external hub\n");
		return -ENODEV;
	}
#endif

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	/* 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;

871 872
	/* If it's not an interrupt in endpoint, we'd better punt! */
	if (!usb_endpoint_is_int_in(endpoint))
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		goto descriptor_error;

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

878
	hub = kzalloc(sizeof(*hub), GFP_KERNEL);
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	if (!hub) {
		dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
		return -ENOMEM;
	}

	INIT_LIST_HEAD(&hub->event_list);
	hub->intfdev = &intf->dev;
	hub->hdev = hdev;
	INIT_WORK(&hub->leds, led_work, hub);

	usb_set_intfdata (intf, hub);

	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);

	/* 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++) {
				if (hdev->children[i] == NULL)
					info->port[i] = 0;
				else
					info->port[i] =
						hdev->children[i]->devnum;
			}
		}
		spin_unlock_irq(&device_state_lock);

		return info->nports + 1;
		}

	default:
		return -ENOSYS;
	}
}


/* grab device/port lock, returning index of that port (zero based).
 * protects the upstream link used by this device from concurrent
 * tree operations like suspend, resume, reset, and disconnect, which
 * apply to everything downstream of a given port.
 */
static int locktree(struct usb_device *udev)
{
	int			t;
	struct usb_device	*hdev;

	if (!udev)
		return -ENODEV;

	/* root hub is always the first lock in the series */
	hdev = udev->parent;
	if (!hdev) {
		usb_lock_device(udev);
		return 0;
	}

	/* on the path from root to us, lock everything from
	 * top down, dropping parent locks when not needed
	 */
	t = locktree(hdev);
	if (t < 0)
		return t;

963 964 965 966 967 968
	/* everything is fail-fast once disconnect
	 * processing starts
	 */
	if (udev->state == USB_STATE_NOTATTACHED) {
		usb_unlock_device(hdev);
		return -ENODEV;
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	}
970 971 972 973 974

	/* when everyone grabs locks top->bottom,
	 * non-overlapping work may be concurrent
	 */
	usb_lock_device(udev);
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	usb_unlock_device(hdev);
976
	return udev->portnum;
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}

static void recursively_mark_NOTATTACHED(struct usb_device *udev)
{
	int i;

	for (i = 0; i < udev->maxchild; ++i) {
		if (udev->children[i])
			recursively_mark_NOTATTACHED(udev->children[i]);
	}
	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;

	spin_lock_irqsave(&device_state_lock, flags);
	if (udev->state == USB_STATE_NOTATTACHED)
		;	/* do nothing */
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	else if (new_state != USB_STATE_NOTATTACHED) {
1020 1021 1022 1023 1024

		/* root hub wakeup capabilities are managed out-of-band
		 * and may involve silicon errata ... ignore them here.
		 */
		if (udev->parent) {
1025 1026 1027 1028
			if (udev->state == USB_STATE_SUSPENDED
					|| new_state == USB_STATE_SUSPENDED)
				;	/* No change to wakeup settings */
			else if (new_state == USB_STATE_CONFIGURED)
1029 1030 1031
				device_init_wakeup(&udev->dev,
					(udev->actconfig->desc.bmAttributes
					 & USB_CONFIG_ATT_WAKEUP));
1032
			else
1033 1034
				device_init_wakeup(&udev->dev, 0);
		}
1035
		udev->state = new_state;
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	} else
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		recursively_mark_NOTATTACHED(udev);
	spin_unlock_irqrestore(&device_state_lock, flags);
}


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#ifdef	CONFIG_PM
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072

/**
 * 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
 * has been reset.  The routine marks all the children of the root hub
 * as NOTATTACHED and marks logical connect-change events on their ports.
 */
void usb_root_hub_lost_power(struct usb_device *rhdev)
{
	struct usb_hub *hub;
	int port1;
	unsigned long flags;

	dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
	spin_lock_irqsave(&device_state_lock, flags);
	hub = hdev_to_hub(rhdev);
	for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
		if (rhdev->children[port1 - 1]) {
			recursively_mark_NOTATTACHED(
					rhdev->children[port1 - 1]);
			set_bit(port1, hub->change_bits);
		}
	}
	spin_unlock_irqrestore(&device_state_lock, flags);
}
EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);

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#endif	/* CONFIG_PM */
1074

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static void choose_address(struct usb_device *udev)
{
	int		devnum;
	struct usb_bus	*bus = udev->bus;

	/* If khubd ever becomes multithreaded, this will need a lock */

	/* 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);

	if (devnum < 128) {
		set_bit(devnum, bus->devmap.devicemap);
		udev->devnum = devnum;
	}
}

static void release_address(struct usb_device *udev)
{
	if (udev->devnum > 0) {
		clear_bit(udev->devnum, udev->bus->devmap.devicemap);
		udev->devnum = -1;
	}
}

/**
 * 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;
	int			i;

	if (!udev) {
		pr_debug ("%s nodev\n", __FUNCTION__);
		return;
	}

	/* mark the device as inactive, so any further urb submissions for
	 * this device (and any of its children) will fail immediately.
	 * this quiesces everyting except pending urbs.
	 */
	usb_set_device_state(udev, USB_STATE_NOTATTACHED);
	dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);

1137 1138
	usb_lock_device(udev);

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	/* Free up all the children before we remove this device */
	for (i = 0; i < USB_MAXCHILDREN; i++) {
		if (udev->children[i])
			usb_disconnect(&udev->children[i]);
	}

	/* 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.
	 */
1149
	dev_dbg (&udev->dev, "unregistering device\n");
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	usb_disable_device(udev, 0);

1152 1153 1154 1155 1156 1157 1158
	usb_unlock_device(udev);

	/* Unregister the device.  The device driver is responsible
	 * for removing the device files from usbfs and sysfs and for
	 * de-configuring the device.
	 */
	device_del(&udev->dev);
1159

1160
	/* Free the device number and delete the parent's children[]
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	 * (or root_hub) pointer.
	 */
	release_address(udev);

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

1170
	put_device(&udev->dev);
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}

#ifdef DEBUG
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);
}

#else
static inline void show_string(struct usb_device *udev, char *id, char *string)
{}
#endif


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

/**
 * usb_new_device - perform initial device setup (usbcore-internal)
 * @udev: newly addressed device (in ADDRESS state)
 *
 * This is called with devices which have been enumerated, but not yet
 * configured.  The device descriptor is available, but not descriptors
1197 1198
 * for any device configuration.  The caller must have locked either
 * the parent hub (if udev is a normal device) or else the
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 * 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.
 *
 * Returns 0 for success (device is configured and listed, with its
 * interfaces, in sysfs); else a negative errno value.
 *
 * This call is synchronous, and may not be used in an interrupt context.
 *
1208
 * Only the hub driver or root-hub registrar should ever call this.
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 */
int usb_new_device(struct usb_device *udev)
{
	int err;

	err = usb_get_configuration(udev);
	if (err < 0) {
		dev_err(&udev->dev, "can't read configurations, error %d\n",
			err);
		goto fail;
	}

	/* read the standard strings and cache them if present */
1222 1223 1224 1225
	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);
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	/* Tell the world! */
	dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
			"SerialNumber=%d\n",
			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);

#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) {
		struct usb_otg_descriptor	*desc = 0;
		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) {
1254
				unsigned		port1 = udev->portnum;
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				struct usb_device	*root = udev->parent;
				
				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,
						"can't set HNP mode; %d\n",
						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) {
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			static int __usb_port_suspend(struct usb_device *,
1292
						int port1);
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			err = __usb_port_suspend(udev, udev->bus->otg_port);
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			if (err < 0)
				dev_dbg(&udev->dev, "HNP fail, %d\n", err);
		}
		err = -ENODEV;
		goto fail;
	}
#endif

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	/* Register the device.  The device driver is responsible
	 * for adding the device files to usbfs and sysfs and for
	 * configuring the device.
	 */
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	err = device_add (&udev->dev);
	if (err) {
		dev_err(&udev->dev, "can't device_add, error %d\n", err);
		goto fail;
	}
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	return 0;

fail:
	usb_set_device_state(udev, USB_STATE_NOTATTACHED);
	return err;
}


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

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

1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348

/* 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;
}


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#define PORT_RESET_TRIES	5
#define SET_ADDRESS_TRIES	2
#define GET_DESCRIPTOR_TRIES	2
#define SET_CONFIG_TRIES	(2 * (use_both_schemes + 1))
#define USE_NEW_SCHEME(i)	((i) / 2 == old_scheme_first)

#define HUB_ROOT_RESET_TIME	50	/* times are in msec */
#define HUB_SHORT_RESET_TIME	10
#define HUB_LONG_RESET_TIME	200
#define HUB_RESET_TIMEOUT	500

static int hub_port_wait_reset(struct usb_hub *hub, int port1,
				struct usb_device *udev, unsigned int delay)
{
	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;

		/* Device went away? */
		if (!(portstatus & USB_PORT_STAT_CONNECTION))
			return -ENOTCONN;

		/* bomb out completely if something weird happened */
		if ((portchange & USB_PORT_STAT_C_CONNECTION))
			return -EINVAL;

		/* if we`ve finished resetting, then break out of the loop */
		if (!(portstatus & USB_PORT_STAT_RESET) &&
		    (portstatus & USB_PORT_STAT_ENABLE)) {
1389 1390 1391
			if (hub_is_wusb(hub))
				udev->speed = USB_SPEED_VARIABLE;
			else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
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				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;
		}

		/* 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,
			"port %d not reset yet, waiting %dms\n",
			port1, delay);
	}

	return -EBUSY;
}

static int hub_port_reset(struct usb_hub *hub, int port1,
				struct usb_device *udev, unsigned int delay)
{
	int i, status;

	/* Reset the port */
	for (i = 0; i < PORT_RESET_TRIES; i++) {
		status = set_port_feature(hub->hdev,
				port1, USB_PORT_FEAT_RESET);
		if (status)
			dev_err(hub->intfdev,
					"cannot reset port %d (err = %d)\n",
					port1, status);
		else {
			status = hub_port_wait_reset(hub, port1, udev, delay);
1427
			if (status && status != -ENOTCONN)
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				dev_dbg(hub->intfdev,
						"port_wait_reset: err = %d\n",
						status);
		}

		/* return on disconnect or reset */
		switch (status) {
		case 0:
1436 1437
			/* TRSTRCY = 10 ms; plus some extra */
			msleep(10 + 40);
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			/* FALL THROUGH */
		case -ENOTCONN:
		case -ENODEV:
			clear_port_feature(hub->hdev,
				port1, USB_PORT_FEAT_C_RESET);
			/* FIXME need disconnect() for NOTATTACHED device */
			usb_set_device_state(udev, status
					? USB_STATE_NOTATTACHED
					: USB_STATE_DEFAULT);
			return status;
		}

		dev_dbg (hub->intfdev,
			"port %d not enabled, trying reset again...\n",
			port1);
		delay = HUB_LONG_RESET_TIME;
	}

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

	return status;
}

/*
 * Disable a port and mark a logical connnect-change event, so that some
 * 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);

	/* FIXME let caller ask to power down the port:
	 *  - some devices won't enumerate without a VBUS power cycle
	 *  - SRP saves power that way
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	 *  - ... new call, TBD ...
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	 * 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);
}

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#ifdef	CONFIG_PM
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#ifdef	CONFIG_USB_SUSPEND

/*
 * 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.
 */
static int hub_port_suspend(struct usb_hub *hub, int port1,
		struct usb_device *udev)
{
	int	status;

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

	/* 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.
	 */
1513
	if (udev->do_remote_wakeup) {
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		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);
		if (status)
			dev_dbg(&udev->dev,
				"won't remote wakeup, status %d\n",
				status);
	}

	/* see 7.1.7.6 */
	status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
	if (status) {
		dev_dbg(hub->intfdev,
			"can't suspend port %d, status %d\n",
			port1, status);
		/* paranoia:  "should not happen" */
		(void) 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);
	} else {
		/* device has up to 10 msec to fully suspend */
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		dev_dbg(&udev->dev, "usb %ssuspend\n",
				udev->auto_pm ? "auto-" : "");
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		usb_set_device_state(udev, USB_STATE_SUSPENDED);
		msleep(10);
	}
	return status;
}

/*
 * Devices on USB hub ports have only one "suspend" state, corresponding
1549
 * to ACPI D2, "may cause the device to lose some context".
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 * 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.
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 *
 * 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.
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 */
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static int __usb_port_suspend (struct usb_device *udev, int port1)
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{
1567
	int	status = 0;
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	/* caller owns the udev device lock */
	if (port1 < 0)
		return port1;

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	/* we change the device's upstream USB link,
	 * but root hubs have no upstream USB link.
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	 */
1576
	if (udev->parent)
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		status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
				udev);
1579
	else {
1580 1581
		dev_dbg(&udev->dev, "usb %ssuspend\n",
				udev->auto_pm ? "auto-" : "");
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		usb_set_device_state(udev, USB_STATE_SUSPENDED);
	}
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	return status;
}

1587
/*
1588
 * usb_port_suspend - suspend a usb device's upstream port
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 * @udev: device that's no longer in active use
1590
 * Context: must be able to sleep; device not locked; pm locks held
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 *
 * 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
1595
 * suspend by the host, using usb_port_resume().  It's also routine
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 * to disconnect devices while they are suspended.
 *
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 * This only affects the USB hardware for a device; its interfaces
 * (and, for hubs, child devices) must already have been suspended.
 *
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 * 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.
 *
 * Returns 0 on success, else negative errno.
 */
1607
int usb_port_suspend(struct usb_device *udev)
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{
1609
	return __usb_port_suspend(udev, udev->portnum);
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}
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/*
1613 1614 1615
 * If the USB "suspend" state is in use (rather than "global suspend"),
 * many devices will be individually taken out of suspend state using
 * special" resume" signaling.  These routines kick in shortly after
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 * 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.
 */
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static int finish_port_resume(struct usb_device *udev)
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{
	int	status;
	u16	devstatus;

	/* caller owns the udev device lock */
1626
	dev_dbg(&udev->dev, "finish resume\n");
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	/* 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);

 	/* 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.
	 */
	status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1642 1643 1644 1645
	if (status >= 0)
		status = (status == 2 ? 0 : -ENODEV);

	if (status)
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		dev_dbg(&udev->dev,
			"gone after usb resume? status %d\n",
			status);
	else if (udev->actconfig) {
		le16_to_cpus(&devstatus);
1651
		if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
1652
				&& udev->parent) {
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			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);
1660
			if (status)
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				dev_dbg(&udev->dev, "disable remote "
					"wakeup, status %d\n", status);
1663
		}
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		status = 0;

	} else if (udev->devnum <= 0) {
		dev_dbg(&udev->dev, "bogus resume!\n");
		status = -EINVAL;
	}
	return status;
}

static int
hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
{
	int	status;

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

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	set_bit(port1, hub->busy_bits);

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	/* see 7.1.7.7; affects power usage, but not budgeting */
	status = clear_port_feature(hub->hdev,
			port1, USB_PORT_FEAT_SUSPEND);
	if (status) {
		dev_dbg(hub->intfdev,
			"can't resume port %d, status %d\n",
			port1, status);
	} else {
		u16		devstatus;
		u16		portchange;

		/* drive resume for at least 20 msec */
		if (udev)
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			dev_dbg(&udev->dev, "usb %sresume\n",
					udev->auto_pm ? "auto-" : "");
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		msleep(25);

#define LIVE_FLAGS	( USB_PORT_STAT_POWER \
			| USB_PORT_STAT_ENABLE \
			| USB_PORT_STAT_CONNECTION)

		/* Virtual root hubs can trigger on GET_PORT_STATUS to
		 * stop resume signaling.  Then finish the resume
		 * sequence.
		 */
		devstatus = portchange = 0;
		status = hub_port_status(hub, port1,
				&devstatus, &portchange);
		if (status < 0
				|| (devstatus & LIVE_FLAGS) != LIVE_FLAGS
				|| (devstatus & USB_PORT_STAT_SUSPEND) != 0
				) {
			dev_dbg(hub->intfdev,
				"port %d status %04x.%04x after resume, %d\n",
				port1, portchange, devstatus, status);
1717 1718
			if (status >= 0)
				status = -ENODEV;
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		} else {
1720 1721 1722
			if (portchange & USB_PORT_STAT_C_SUSPEND)
				clear_port_feature(hub->hdev, port1,
						USB_PORT_FEAT_C_SUSPEND);
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			/* TRSMRCY = 10 msec */
			msleep(10);
			if (udev)
1726
				status = finish_port_resume(udev);
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		}
	}
	if (status < 0)
		hub_port_logical_disconnect(hub, port1);

1732 1733 1734 1735
	clear_bit(port1, hub->busy_bits);
	if (!hub->hdev->parent && !hub->busy_bits[0])
		usb_enable_root_hub_irq(hub->hdev->bus);

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	return status;
}

1739
/*
1740
 * usb_port_resume - re-activate a suspended usb device's upstream port
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 * @udev: device to re-activate
1742
 * Context: must be able to sleep; device not locked; pm locks held
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 *
 * 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.
 *
 * Returns 0 on success, else negative errno.
 */
1752
int usb_port_resume(struct usb_device *udev)
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{
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	int	status;
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1756 1757 1758
	/* we change the device's upstream USB link,
	 * but root hubs have no upstream USB link.
	 */
1759
	if (udev->parent) {
1760 1761 1762
		// NOTE this fails if parent is also suspended...
		status = hub_port_resume(hdev_to_hub(udev->parent),
				udev->portnum, udev);
1763 1764 1765
	} else {
		dev_dbg(&udev->dev, "usb %sresume\n",
				udev->auto_pm ? "auto-" : "");
1766
		status = finish_port_resume(udev);
1767
	}
1768
	if (status < 0)
1769
		dev_dbg(&udev->dev, "can't resume, status %d\n", status);
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	return status;
}

static int remote_wakeup(struct usb_device *udev)
{
	int	status = 0;

1777 1778 1779
	/* All this just to avoid sending a port-resume message
	 * to the parent hub! */

1780
	usb_lock_device(udev);
1781
	mutex_lock_nested(&udev->pm_mutex, udev->level);
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	if (udev->state == USB_STATE_SUSPENDED) {
1783
		dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
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		/* TRSMRCY = 10 msec */
		msleep(10);
1786
		status = finish_port_resume(udev);
1787 1788
		if (status == 0)
			udev->dev.power.power_state.event = PM_EVENT_ON;
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	}
1790
	mutex_unlock(&udev->pm_mutex);
1791 1792

	if (status == 0)
1793
		usb_autoresume_device(udev, 0);
1794
	usb_unlock_device(udev);
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	return status;
}

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#else	/* CONFIG_USB_SUSPEND */

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

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

static inline int
finish_port_resume(struct usb_device *udev)
{
	return 0;
}

static inline int
hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
{
	return 0;
}

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

static inline int remote_wakeup(struct usb_device *udev)
{
	return 0;
}

#endif

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static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
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{
	struct usb_hub		*hub = usb_get_intfdata (intf);
	struct usb_device	*hdev = hub->hdev;
	unsigned		port1;

1837
	/* fail if children aren't already suspended */
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	for (port1 = 1; port1 <= hdev->maxchild; port1++) {
		struct usb_device	*udev;

		udev = hdev->children [port1-1];
1842
		if (udev && msg.event == PM_EVENT_SUSPEND &&
1843
#ifdef	CONFIG_USB_SUSPEND
1844 1845 1846 1847
				udev->state != USB_STATE_SUSPENDED
#else
				udev->dev.power.power_state.event
					== PM_EVENT_ON
1848
#endif
1849
				) {
1850 1851 1852
			if (!hdev->auto_pm)
				dev_dbg(&intf->dev, "port %d nyet suspended\n",
						port1);
1853 1854
			return -EBUSY;
		}
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	}

1857 1858 1859
	/* "global suspend" of the downstream HC-to-USB interface */
	if (!hdev->parent) {
		struct usb_bus	*bus = hdev->bus;
1860 1861
		if (bus) {
			int	status = hcd_bus_suspend (bus);
1862 1863 1864 1865 1866 1867 1868 1869 1870 1871

			if (status != 0) {
				dev_dbg(&hdev->dev, "'global' suspend %d\n",
					status);
				return status;
			}
		} else
			return -EOPNOTSUPP;
	}

1872 1873
	/* stop khubd and related activity */
	hub_quiesce(hub);
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	return 0;
}

static int hub_resume(struct usb_interface *intf)
{
	struct usb_device	*hdev = interface_to_usbdev(intf);
	struct usb_hub		*hub = usb_get_intfdata (intf);
	int			status;

1883 1884 1885
	/* "global resume" of the downstream HC-to-USB interface */
	if (!hdev->parent) {
		struct usb_bus	*bus = hdev->bus;
1886 1887
		if (bus) {
			status = hcd_bus_resume (bus);
1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900
			if (status) {
				dev_dbg(&intf->dev, "'global' resume %d\n",
					status);
				return status;
			}
		} else
			return -EOPNOTSUPP;
		if (status == 0) {
			/* TRSMRCY = 10 msec */
			msleep(10);
		}
	}

1901
	/* tell khubd to look for changes on this hub */
1902
	hub_activate(hub);
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	return 0;
}

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#else	/* CONFIG_PM */

static inline int remote_wakeup(struct usb_device *udev)
{
	return 0;
}

1913 1914
#define hub_suspend NULL
#define hub_resume NULL
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#endif

1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928
void usb_suspend_root_hub(struct usb_device *hdev)
{
	struct usb_hub *hub = hdev_to_hub(hdev);

	/* This also makes any led blinker stop retriggering.  We're called
	 * from irq, so the blinker might still be scheduled.  Caller promises
	 * that the root hub status URB will be canceled.
	 */
	__hub_quiesce(hub);
	mark_quiesced(to_usb_interface(hub->intfdev));
}

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void usb_resume_root_hub(struct usb_device *hdev)
{
	struct usb_hub *hub = hdev_to_hub(hdev);

	hub->resume_root_hub = 1;
	kick_khubd(hub);
}


/* 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.
 */

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

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;
}

static void ep0_reinit(struct usb_device *udev)
{
	usb_disable_endpoint(udev, 0 + USB_DIR_IN);
	usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
	udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
}

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

static int hub_set_address(struct usb_device *udev)
{
	int retval;

	if (udev->devnum == 0)
		return -EINVAL;
	if (udev->state == USB_STATE_ADDRESS)
		return 0;
	if (udev->state != USB_STATE_DEFAULT)
		return -EINVAL;
	retval = usb_control_msg(udev, usb_sndaddr0pipe(),
		USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
		NULL, 0, USB_CTRL_SET_TIMEOUT);
	if (retval == 0) {
		usb_set_device_state(udev, USB_STATE_ADDRESS);
		ep0_reinit(udev);
	}
	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
 * usb_reset_device), the caller must own the device lock.  For a
 * 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)
{
2042
	static DEFINE_MUTEX(usb_address0_mutex);
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2043 2044 2045 2046 2047

	struct usb_device	*hdev = hub->hdev;
	int			i, j, retval;
	unsigned		delay = HUB_SHORT_RESET_TIME;
	enum usb_device_speed	oldspeed = udev->speed;
2048
	char 			*speed, *type;
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2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063

	/* 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;

2064
	mutex_lock(&usb_address0_mutex);
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2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080

	/* Reset the device; full speed may morph to high speed */
	retval = hub_port_reset(hub, port1, udev, delay);
	if (retval < 0)		/* error or disconnect */
		goto fail;
				/* success, speed is known */
	retval = -ENODEV;

	if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
		dev_dbg(&udev->dev, "device reset changed speed!\n");
		goto fail;
	}
	oldspeed = udev->speed;
  
	/* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
	 * it's fixed size except for full speed devices.
2081 2082
	 * 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
2083 2084
	 */
	switch (udev->speed) {
2085 2086 2087
	case USB_SPEED_VARIABLE:	/* fixed at 512 */
		udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
		break;
L
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2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104
	case USB_SPEED_HIGH:		/* fixed at 64 */
		udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
		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.
		 */
		udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
		break;
	case USB_SPEED_LOW:		/* fixed at 8 */
		udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
		break;
	default:
		goto fail;
	}
 
2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115
	type = "";
	switch (udev->speed) {
	case USB_SPEED_LOW:	speed = "low";	break;
	case USB_SPEED_FULL:	speed = "full";	break;
	case USB_SPEED_HIGH:	speed = "high";	break;
	case USB_SPEED_VARIABLE:
				speed = "variable";
				type = "Wireless ";
				break;
	default: 		speed = "?";	break;
	}
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Linus Torvalds 已提交
2116
	dev_info (&udev->dev,
2117 2118 2119
		  "%s %s speed %sUSB device using %s and address %d\n",
		  (udev->config) ? "reset" : "new", speed, type,
		  udev->bus->controller->driver->name, udev->devnum);
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Linus Torvalds 已提交
2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160

	/* 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) {
		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))) {
		if (USE_NEW_SCHEME(retry_counter)) {
			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;
			}

			/* Use a short timeout the first time through,
			 * so that recalcitrant full-speed devices with
			 * 8- or 16-byte ep0-maxpackets won't slow things
			 * down tremendously by NAKing the unexpectedly
			 * early status stage.  Also, retry on all errors;
			 * some devices are flakey.
2161 2162
			 * 255 is for WUSB devices, we actually need to use 512.
			 * WUSB1.0[4.8.1].
L
Linus Torvalds 已提交
2163 2164 2165 2166 2167 2168 2169 2170 2171
			 */
			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,
					(i ? USB_CTRL_GET_TIMEOUT : 1000));
				switch (buf->bMaxPacketSize0) {
2172
				case 8: case 16: case 32: case 64: case 255:
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2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245
					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);

			retval = hub_port_reset(hub, port1, udev, delay);
			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) {
				dev_err(&udev->dev, "device descriptor "
						"read/%s, error %d\n",
						"64", r);
				retval = -EMSGSIZE;
				continue;
			}
#undef GET_DESCRIPTOR_BUFSIZE
		}

		for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
			retval = hub_set_address(udev);
			if (retval >= 0)
				break;
			msleep(200);
		}
		if (retval < 0) {
			dev_err(&udev->dev,
				"device not accepting address %d, error %d\n",
				udev->devnum, retval);
			goto fail;
		}
 
		/* cope with hardware quirkiness:
		 *  - let SET_ADDRESS settle, some device hardware wants it
		 *  - read ep0 maxpacket even for high and low speed,
  		 */
		msleep(10);
		if (USE_NEW_SCHEME(retry_counter))
			break;

		retval = usb_get_device_descriptor(udev, 8);
		if (retval < 8) {
			dev_err(&udev->dev, "device descriptor "
					"read/%s, error %d\n",
					"8", retval);
			if (retval >= 0)
				retval = -EMSGSIZE;
		} else {
			retval = 0;
			break;
		}
	}
	if (retval)
		goto fail;

2246 2247
	i = udev->descriptor.bMaxPacketSize0 == 0xff?
	    512 : udev->descriptor.bMaxPacketSize0;
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2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273
	if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
		if (udev->speed != USB_SPEED_FULL ||
				!(i == 8 || i == 16 || i == 32 || i == 64)) {
			dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
			retval = -EMSGSIZE;
			goto fail;
		}
		dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
		ep0_reinit(udev);
	}
  
	retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
	if (retval < (signed)sizeof(udev->descriptor)) {
		dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
			"all", retval);
		if (retval >= 0)
			retval = -ENOMSG;
		goto fail;
	}

	retval = 0;

fail:
	if (retval)
		hub_port_disable(hub, port1, 0);
2274
	mutex_unlock(&usb_address0_mutex);
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	return retval;
}

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

	qual = kmalloc (sizeof *qual, SLAB_KERNEL);
	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;
			schedule_work (&hub->leds);
		}
	}
2299
	kfree(qual);
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}

static unsigned
hub_power_remaining (struct usb_hub *hub)
{
	struct usb_device *hdev = hub->hdev;
	int remaining;
2307
	int port1;
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2309
	if (!hub->limited_power)
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		return 0;

2312 2313 2314 2315
	remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
	for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
		struct usb_device	*udev = hdev->children[port1 - 1];
		int			delta;
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		if (!udev)
			continue;

2320 2321
		/* Unconfigured devices may not use more than 100mA,
		 * or 8mA for OTG ports */
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		if (udev->actconfig)
2323 2324 2325
			delta = udev->actconfig->desc.bMaxPower * 2;
		else if (port1 != udev->bus->otg_port || hdev->parent)
			delta = 100;
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		else
2327 2328 2329 2330 2331
			delta = 8;
		if (delta > hub->mA_per_port)
			dev_warn(&udev->dev, "%dmA is over %umA budget "
					"for port %d!\n",
					delta, hub->mA_per_port, port1);
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		remaining -= delta;
	}
	if (remaining < 0) {
2335 2336
		dev_warn(hub->intfdev, "%dmA over power budget!\n",
			- remaining);
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		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);
 *	usb_reset_device() encounters changed descriptors (as from
 *		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;
2355
	u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
L
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	int status, i;
 
	dev_dbg (hub_dev,
		"port %d, status %04x, change %04x, %s\n",
		port1, portstatus, portchange, portspeed (portstatus));

	if (hub->has_indicators) {
		set_port_led(hub, port1, HUB_LED_AUTO);
		hub->indicator[port1-1] = INDICATOR_AUTO;
	}
 
	/* Disconnect any existing devices under this port */
	if (hdev->children[port1-1])
		usb_disconnect(&hdev->children[port1-1]);
	clear_bit(port1, hub->change_bits);

#ifdef	CONFIG_USB_OTG
	/* during HNP, don't repeat the debounce */
	if (hdev->bus->is_b_host)
		portchange &= ~USB_PORT_STAT_C_CONNECTION;
#endif

	if (portchange & USB_PORT_STAT_C_CONNECTION) {
		status = hub_port_debounce(hub, port1);
		if (status < 0) {
			dev_err (hub_dev,
				"connect-debounce failed, port %d disabled\n",
				port1);
			goto done;
		}
		portstatus = status;
	}

	/* Return now if nothing is connected */
	if (!(portstatus & USB_PORT_STAT_CONNECTION)) {

		/* maybe switch power back on (e.g. root hub was reset) */
2393
		if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
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				&& !(portstatus & (1 << USB_PORT_FEAT_POWER)))
			set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
 
		if (portstatus & USB_PORT_STAT_ENABLE)
  			goto done;
		return;
	}

#ifdef  CONFIG_USB_SUSPEND
	/* If something is connected, but the port is suspended, wake it up. */
	if (portstatus & USB_PORT_STAT_SUSPEND) {
		status = hub_port_resume(hub, port1, NULL);
		if (status < 0) {
			dev_dbg(hub_dev,
				"can't clear suspend on port %d; %d\n",
				port1, status);
			goto done;
		}
	}
#endif

	for (i = 0; i < SET_CONFIG_TRIES; i++) {
		struct usb_device *udev;

		/* 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);
		udev->speed = USB_SPEED_UNKNOWN;
2431
 		udev->bus_mA = hub->mA_per_port;
2432
		udev->level = hdev->level + 1;
2433

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		/* set the address */
		choose_address(udev);
		if (udev->devnum <= 0) {
			status = -ENOTCONN;	/* Don't retry */
			goto loop;
		}

		/* reset and get descriptor */
		status = hub_port_init(hub, udev, port1, i);
		if (status < 0)
			goto loop;

		/* 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
2453
				&& udev->bus_mA <= 100) {
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			u16	devstat;

			status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
					&devstat);
2458
			if (status < 2) {
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				dev_dbg(&udev->dev, "get status %d ?\n", status);
				goto loop_disable;
			}
2462
			le16_to_cpus(&devstat);
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			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;
					schedule_work (&hub->leds);
				}
				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);

		/* Store the parent's children[] pointer.  At this point
		 * 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
			hdev->children[port1-1] = udev;
		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);
				hdev->children[port1-1] = NULL;
				spin_unlock_irq(&device_state_lock);
			}
		}

		if (status)
			goto loop_disable;

		status = hub_power_remaining(hub);
		if (status)
2515
			dev_dbg(hub_dev, "%dmA power budget left\n", status);
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		return;

loop_disable:
		hub_port_disable(hub, port1, 1);
loop:
		ep0_reinit(udev);
		release_address(udev);
		usb_put_dev(udev);
		if (status == -ENOTCONN)
			break;
	}
 
done:
	hub_port_disable(hub, port1, 1);
}

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;
	int connect_change;

	/*
	 *  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);
		hdev = hub->hdev;
		intf = to_usb_interface(hub->intfdev);
		hub_dev = &intf->dev;

2570 2571 2572
		i = hub->resume_root_hub;

		dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n",
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				hdev->state, hub->descriptor
					? hub->descriptor->bNbrPorts
					: 0,
				/* NOTE: expects max 15 ports... */
				(u16) hub->change_bits[0],
2578 2579
				(u16) hub->event_bits[0],
				i ? ", resume root" : "");
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		usb_get_intf(intf);
		spin_unlock_irq(&hub_event_lock);

		/* Lock the device, then check to see if we were
		 * disconnected while waiting for the lock to succeed. */
		if (locktree(hdev) < 0) {
			usb_put_intf(intf);
			continue;
		}
		if (hub != usb_get_intfdata(intf))
			goto loop;

		/* If the hub has died, clean up after it */
		if (hdev->state == USB_STATE_NOTATTACHED) {
2595 2596
			hub->error = -ENODEV;
			hub_pre_reset(intf);
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			goto loop;
		}

2600 2601 2602 2603 2604
		/* Is this is a root hub wanting to reactivate the downstream
		 * ports?  If so, be sure the interface resumes even if its
		 * stub "device" node was never suspended.
		 */
		if (i)
2605
			usb_autoresume_device(hdev, 0);
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		/* If this is an inactive or suspended hub, do nothing */
		if (hub->quiescing)
			goto loop;

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

2615
			ret = usb_reset_composite_device(hdev, intf);
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			if (ret) {
				dev_dbg (hub_dev,
					"error resetting hub: %d\n", ret);
				goto loop;
			}

			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);
			if (!test_and_clear_bit(i, hub->event_bits) &&
					!connect_change && !hub->activating)
				continue;

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

			if (hub->activating && !hdev->children[i-1] &&
					(portstatus &
						USB_PORT_STAT_CONNECTION))
				connect_change = 1;

			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
				    && hdev->children[i-1]) {
					dev_err (hub_dev,
					    "port %i "
					    "disabled by hub (EMI?), "
					    "re-enabling...\n",
						i);
					connect_change = 1;
				}
			}

			if (portchange & USB_PORT_STAT_C_SUSPEND) {
				clear_port_feature(hdev, i,
					USB_PORT_FEAT_C_SUSPEND);
				if (hdev->children[i-1]) {
					ret = remote_wakeup(hdev->
							children[i-1]);
					if (ret < 0)
						connect_change = 1;
				} else {
					ret = -ENODEV;
					hub_port_disable(hub, i, 1);
				}
				dev_dbg (hub_dev,
					"resume on port %d, status %d\n",
					i, ret);
			}
			
			if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
				dev_err (hub_dev,
					"over-current change on port %d\n",
					i);
				clear_port_feature(hdev, i,
					USB_PORT_FEAT_C_OVER_CURRENT);
				hub_power_on(hub);
			}

			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);
			}

			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);
2726 2727 2728 2729 2730
				if (hubstatus & HUB_STATUS_LOCAL_POWER)
					/* FIXME: Is this always true? */
					hub->limited_power = 0;
				else
					hub->limited_power = 1;
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			}
			if (hubchange & HUB_CHANGE_OVERCURRENT) {
				dev_dbg (hub_dev, "overcurrent change\n");
				msleep(500);	/* Cool down */
				clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
                        	hub_power_on(hub);
			}
		}

		hub->activating = 0;

2742 2743
		/* If this is a root hub, tell the HCD it's okay to
		 * re-enable port-change interrupts now. */
2744
		if (!hdev->parent && !hub->busy_bits[0])
2745 2746
			usb_enable_root_hub_irq(hdev->bus);

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loop:
		usb_unlock_device(hdev);
		usb_put_intf(intf);

        } /* end while (1) */
}

static int hub_thread(void *__unused)
{
	do {
		hub_events();
2758 2759 2760
		wait_event_interruptible(khubd_wait,
				!list_empty(&hub_event_list) ||
				kthread_should_stop());
2761
		try_to_freeze();
2762
	} while (!kthread_should_stop() || !list_empty(&hub_event_list));
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2764 2765
	pr_debug("%s: khubd exiting\n", usbcore_name);
	return 0;
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}

static struct usb_device_id hub_id_table [] = {
    { .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,
2784 2785
	.pre_reset =	hub_pre_reset,
	.post_reset =	hub_post_reset,
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	.ioctl =	hub_ioctl,
	.id_table =	hub_id_table,
};

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;
	}

2798 2799
	khubd_task = kthread_run(hub_thread, NULL, "khubd");
	if (!IS_ERR(khubd_task))
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		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)
{
2811
	kthread_stop(khubd_task);
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	/*
	 * 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() */

static int config_descriptors_changed(struct usb_device *udev)
{
	unsigned			index;
	unsigned			len = 0;
	struct usb_config_descriptor	*buf;

	for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
		if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
			len = le16_to_cpu(udev->config[index].desc.wTotalLength);
	}
	buf = kmalloc (len, SLAB_KERNEL);
	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++) {
		int length;
		int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);

		length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
				old_length);
		if (length < old_length) {
			dev_dbg(&udev->dev, "config index %d, error %d\n",
					index, length);
			break;
		}
		if (memcmp (buf, udev->rawdescriptors[index], old_length)
				!= 0) {
			dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
				index, buf->bConfigurationValue);
			break;
		}
	}
	kfree(buf);
	return index != udev->descriptor.bNumConfigurations;
}

/**
 * usb_reset_device - perform a USB port reset to reinitialize a device
 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
 *
2865 2866 2867
 * WARNING - don't use this routine to reset a composite device
 * (one with multiple interfaces owned by separate drivers)!
 * Use usb_reset_composite_device() instead.
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 *
 * 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().
 */
int usb_reset_device(struct usb_device *udev)
{
	struct usb_device		*parent_hdev = udev->parent;
	struct usb_hub			*parent_hub;
	struct usb_device_descriptor	descriptor = udev->descriptor;
2891 2892
	int 				i, ret = 0;
	int				port1 = udev->portnum;
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	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) {
		/* this requires hcd-specific logic; see OHCI hc_restart() */
		dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
		return -EISDIR;
	}
	parent_hub = hdev_to_hub(parent_hdev);

	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. */
		ep0_reinit(udev);
		ret = hub_port_init(parent_hub, udev, port1, i);
		if (ret >= 0)
			break;
	}
	clear_bit(port1, parent_hub->busy_bits);
2919 2920 2921
	if (!parent_hdev->parent && !parent_hub->busy_bits[0])
		usb_enable_root_hub_irq(parent_hdev->bus);

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	if (ret < 0)
		goto re_enumerate;
 
	/* Device might have changed firmware (DFU or similar) */
	if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
			|| config_descriptors_changed (udev)) {
		dev_info(&udev->dev, "device firmware changed\n");
		udev->descriptor = descriptor;	/* for disconnect() calls */
		goto re_enumerate;
  	}
  
	if (!udev->actconfig)
		goto done;

	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);
		goto re_enumerate;
  	}
	usb_set_device_state(udev, USB_STATE_CONFIGURED);

	for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
		struct usb_interface *intf = udev->actconfig->interface[i];
		struct usb_interface_descriptor *desc;

		/* set_interface resets host side toggle even
		 * for altsetting zero.  the interface may have no driver.
		 */
		desc = &intf->cur_altsetting->desc;
		ret = usb_set_interface(udev, desc->bInterfaceNumber,
			desc->bAlternateSetting);
		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:
	return 0;
 
re_enumerate:
	hub_port_logical_disconnect(parent_hub, port1);
	return -ENODEV;
}
2975
EXPORT_SYMBOL(usb_reset_device);
2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010

/**
 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
 * @iface: interface bound to the driver making the request (optional)
 *
 * 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).
 *
 * Return value is the same as for usb_reset_device().
 *
 * 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().
 *
 * The interface locks are acquired during the pre_reset stage and released
 * during the post_reset stage.  However if iface is not NULL and is
 * currently being probed, we assume that the caller already owns its
 * lock.
 */
int usb_reset_composite_device(struct usb_device *udev,
		struct usb_interface *iface)
{
	int ret;
	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;
	}

3011 3012 3013
	/* Prevent autosuspend during the reset */
	usb_autoresume_device(udev, 1);

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	if (iface && iface->condition != USB_INTERFACE_BINDING)
		iface = NULL;

	if (config) {
		int i;
		struct usb_interface *cintf;
		struct usb_driver *drv;

		for (i = 0; i < config->desc.bNumInterfaces; ++i) {
			cintf = config->interface[i];
			if (cintf != iface)
				down(&cintf->dev.sem);
			if (device_is_registered(&cintf->dev) &&
					cintf->dev.driver) {
				drv = to_usb_driver(cintf->dev.driver);
				if (drv->pre_reset)
					(drv->pre_reset)(cintf);
			}
		}
	}

	ret = usb_reset_device(udev);

	if (config) {
		int i;
		struct usb_interface *cintf;
		struct usb_driver *drv;

		for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
			cintf = config->interface[i];
			if (device_is_registered(&cintf->dev) &&
					cintf->dev.driver) {
				drv = to_usb_driver(cintf->dev.driver);
				if (drv->post_reset)
					(drv->post_reset)(cintf);
			}
			if (cintf != iface)
				up(&cintf->dev.sem);
		}
	}

3055
	usb_autosuspend_device(udev, 1);
3056 3057
	return ret;
}
3058
EXPORT_SYMBOL(usb_reset_composite_device);