hub.c 81.2 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;
694 695 696 697 698
		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);

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	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;
	}

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	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;

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	/* 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) {
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		udev->state = new_state;
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032

		/* root hub wakeup capabilities are managed out-of-band
		 * and may involve silicon errata ... ignore them here.
		 */
		if (udev->parent) {
			if (new_state == USB_STATE_CONFIGURED)
				device_init_wakeup(&udev->dev,
					(udev->actconfig->desc.bmAttributes
					 & USB_CONFIG_ATT_WAKEUP));
			else if (new_state != USB_STATE_SUSPENDED)
				device_init_wakeup(&udev->dev, 0);
		}
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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
1040 1041 1042 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

/**
 * 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 */
1071

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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);

1134 1135
	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.
	 */
1146
	dev_dbg (&udev->dev, "unregistering device\n");
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	usb_disable_device(udev, 0);

1149 1150 1151 1152 1153 1154 1155
	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);
1156

1157
	/* 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);

1167
	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
1194 1195
 * 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.
 *
1205
 * 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 */
1219 1220 1221 1222
	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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1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250

	/* 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) {
1251
				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) {
1288
			static int __usb_port_suspend(struct usb_device *,
1289
						int port1);
1290
			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

1299 1300 1301 1302
	/* 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;
	}
1308

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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;
}

1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345

/* 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)) {
1386 1387 1388
			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);
1424
			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:
1433 1434
			/* 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
1473
	 *  - ... 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.
	 */
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	if (device_may_wakeup(&udev->dev)) {
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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 */
		dev_dbg(&udev->dev, "usb suspend\n");
		usb_set_device_state(udev, USB_STATE_SUSPENDED);
		msleep(10);
	}
	return status;
}

/*
 * Devices on USB hub ports have only one "suspend" state, corresponding
1545
 * 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.
1556 1557 1558 1559
 *
 * 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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 */
1561
static int __usb_port_suspend (struct usb_device *udev, int port1)
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{
1563
	int	status = 0;
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	/* caller owns the udev device lock */
	if (port1 < 0)
		return port1;

1569 1570
	/* we change the device's upstream USB link,
	 * but root hubs have no upstream USB link.
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	 */
1572
	if (udev->parent)
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		status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
				udev);
1575 1576 1577 1578
	else {
		dev_dbg(&udev->dev, "usb suspend\n");
		usb_set_device_state(udev, USB_STATE_SUSPENDED);
	}
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	return status;
}

1582
/*
1583
 * usb_port_suspend - suspend a usb device's upstream port
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 * @udev: device that's no longer in active use
1585
 * 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
1590
 * suspend by the host, using usb_port_resume().  It's also routine
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 * to disconnect devices while they are suspended.
 *
1593 1594 1595
 * 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.
 */
1602
int usb_port_suspend(struct usb_device *udev)
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{
1604
	return __usb_port_suspend(udev, udev->portnum);
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}
1606

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/*
1608 1609 1610
 * 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.
 */
1615
static int finish_port_resume(struct usb_device *udev)
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{
	int	status;
	u16	devstatus;

	/* caller owns the udev device lock */
1621
	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);
1637 1638 1639 1640
	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);
1646
		if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
1647
				&& 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);
1655
			if (status)
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				dev_dbg(&udev->dev, "disable remote "
					"wakeup, status %d\n", status);
1658
		}
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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);

1675 1676
	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)
			dev_dbg(&udev->dev, "RESUME\n");
		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);
1711 1712
			if (status >= 0)
				status = -ENODEV;
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		} else {
1714 1715 1716
			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)
1720
				status = finish_port_resume(udev);
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		}
	}
	if (status < 0)
		hub_port_logical_disconnect(hub, port1);

1726 1727 1728 1729
	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;
}

1733
/*
1734
 * usb_port_resume - re-activate a suspended usb device's upstream port
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 * @udev: device to re-activate
1736
 * 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.
 */
1746
int usb_port_resume(struct usb_device *udev)
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{
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1748
	int	status;
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1750 1751 1752
	/* we change the device's upstream USB link,
	 * but root hubs have no upstream USB link.
	 */
1753
	if (udev->parent) {
1754 1755 1756
		// NOTE this fails if parent is also suspended...
		status = hub_port_resume(hdev_to_hub(udev->parent),
				udev->portnum, udev);
1757
	} else
1758
		status = finish_port_resume(udev);
1759
	if (status < 0)
1760
		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;

	/* don't repeat RESUME sequence if this device
	 * was already woken up by some other task
	 */
1771
	usb_lock_device(udev);
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	if (udev->state == USB_STATE_SUSPENDED) {
		dev_dbg(&udev->dev, "RESUME (wakeup)\n");
		/* TRSMRCY = 10 msec */
		msleep(10);
1776
		status = finish_port_resume(udev);
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	}
1778 1779 1780

	if (status == 0)
		usb_resume_both(udev);
1781
	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;

1824
	/* 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];
1829
		if (udev && msg.event == PM_EVENT_SUSPEND &&
1830
#ifdef	CONFIG_USB_SUSPEND
1831 1832 1833 1834
				udev->state != USB_STATE_SUSPENDED
#else
				udev->dev.power.power_state.event
					== PM_EVENT_ON
1835
#endif
1836
				) {
1837 1838 1839
			dev_dbg(&intf->dev, "port %d nyet suspended\n", port1);
			return -EBUSY;
		}
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	}

1842 1843 1844
	/* "global suspend" of the downstream HC-to-USB interface */
	if (!hdev->parent) {
		struct usb_bus	*bus = hdev->bus;
1845 1846
		if (bus) {
			int	status = hcd_bus_suspend (bus);
1847 1848 1849 1850 1851 1852 1853 1854 1855 1856

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

1857 1858
	/* 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;

1868 1869 1870
	/* "global resume" of the downstream HC-to-USB interface */
	if (!hdev->parent) {
		struct usb_bus	*bus = hdev->bus;
1871 1872
		if (bus) {
			status = hcd_bus_resume (bus);
1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885
			if (status) {
				dev_dbg(&intf->dev, "'global' resume %d\n",
					status);
				return status;
			}
		} else
			return -EOPNOTSUPP;
		if (status == 0) {
			/* TRSMRCY = 10 msec */
			msleep(10);
		}
	}

1886
	/* tell khubd to look for changes on this hub */
1887
	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;
}

#endif

1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911
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)
{
2025
	static DEFINE_MUTEX(usb_address0_mutex);
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	struct usb_device	*hdev = hub->hdev;
	int			i, j, retval;
	unsigned		delay = HUB_SHORT_RESET_TIME;
	enum usb_device_speed	oldspeed = udev->speed;
2031
	char 			*speed, *type;
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	/* 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;

2047
	mutex_lock(&usb_address0_mutex);
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	/* 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.
2064 2065
	 * For Wireless USB devices, ep0 max packet is always 512 (tho
	 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
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	 */
	switch (udev->speed) {
2068 2069 2070
	case USB_SPEED_VARIABLE:	/* fixed at 512 */
		udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
		break;
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	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;
	}
 
2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098
	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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	dev_info (&udev->dev,
2100 2101 2102
		  "%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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	/* 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.
2144 2145
			 * 255 is for WUSB devices, we actually need to use 512.
			 * WUSB1.0[4.8.1].
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			 */
			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) {
2155
				case 8: case 16: case 32: case 64: case 255:
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					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;

2229 2230
	i = udev->descriptor.bMaxPacketSize0 == 0xff?
	    512 : udev->descriptor.bMaxPacketSize0;
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	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);
2257
	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);
		}
	}
2282
	kfree(qual);
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}

static unsigned
hub_power_remaining (struct usb_hub *hub)
{
	struct usb_device *hdev = hub->hdev;
	int remaining;
2290
	int port1;
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2292
	if (!hub->limited_power)
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		return 0;

2295 2296 2297 2298
	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;

2303 2304
		/* Unconfigured devices may not use more than 100mA,
		 * or 8mA for OTG ports */
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		if (udev->actconfig)
2306 2307 2308
			delta = udev->actconfig->desc.bMaxPower * 2;
		else if (port1 != udev->bus->otg_port || hdev->parent)
			delta = 100;
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		else
2310 2311 2312 2313 2314
			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) {
2318 2319
		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;
2338
	u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
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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) */
2376
		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;
2414 2415
 		udev->bus_mA = hub->mA_per_port;

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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
2435
				&& udev->bus_mA <= 100) {
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			u16	devstat;

			status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
					&devstat);
2440
			if (status < 2) {
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				dev_dbg(&udev->dev, "get status %d ?\n", status);
				goto loop_disable;
			}
2444
			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)
2497
			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;

2552 2553 2554
		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],
2560 2561
				(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) {
2577 2578
			hub->error = -ENODEV;
			hub_pre_reset(intf);
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			goto loop;
		}

2582 2583 2584 2585 2586 2587 2588
		/* 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)
			usb_resume_both(hdev);

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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);

2597
			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);
2708 2709 2710 2711 2712
				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;

2724 2725
		/* If this is a root hub, tell the HCD it's okay to
		 * re-enable port-change interrupts now. */
2726
		if (!hdev->parent && !hub->busy_bits[0])
2727 2728
			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();
2740 2741 2742
		wait_event_interruptible(khubd_wait,
				!list_empty(&hub_event_list) ||
				kthread_should_stop());
2743
		try_to_freeze();
2744
	} while (!kthread_should_stop() || !list_empty(&hub_event_list));
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2746 2747
	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,
2766 2767
	.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;
	}

2780 2781
	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)
{
2793
	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)
 *
2847 2848 2849
 * 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;
2873 2874
	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);
2901 2902 2903
	if (!parent_hdev->parent && !parent_hub->busy_bits[0])
		usb_enable_root_hub_irq(parent_hdev->bus);

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2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956
	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;
}
2957
EXPORT_SYMBOL(usb_reset_device);
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/**
 * 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;
	}

	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);
		}
	}

	return ret;
}
3036
EXPORT_SYMBOL(usb_reset_composite_device);