dirty fix to merging

1 files changed, 4284 insertions, 0 deletions

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
new file mode 100644
index 00000000..d6dab03a
--- /dev/null
+++ b/drivers/usb/core/hub.c
@@ -0,0 +1,4284 @@
+/*
+ * USB hub driver.
+ *
+ * (C) Copyright 1999 Linus Torvalds
+ * (C) Copyright 1999 Johannes Erdfelt
+ * (C) Copyright 1999 Gregory P. Smith
+ * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/completion.h>
+#include <linux/sched.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/ioctl.h>
+#include <linux/usb.h>
+#include <linux/usbdevice_fs.h>
+#include <linux/usb/hcd.h>
+#include <linux/usb/quirks.h>
+#include <linux/kthread.h>
+#include <linux/mutex.h>
+#include <linux/freezer.h>
+
+#include <asm/uaccess.h>
+#include <asm/byteorder.h>
+
+#include "usb.h"
+
+/* if we are in debug mode, always announce new devices */
+#ifdef DEBUG
+#ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
+#define CONFIG_USB_ANNOUNCE_NEW_DEVICES
+#endif
+#endif
+
+struct usb_hub {
+	struct device		*intfdev;	/* the "interface" device */
+	struct usb_device	*hdev;
+	struct kref		kref;
+	struct urb		*urb;		/* for interrupt polling pipe */
+
+	/* buffer for urb ... with extra space in case of babble */
+	char			(*buffer)[8];
+	union {
+		struct usb_hub_status	hub;
+		struct usb_port_status	port;
+	}			*status;	/* buffer for status reports */
+	struct mutex		status_mutex;	/* for the status buffer */
+
+	int			error;		/* last reported error */
+	int			nerrors;	/* track consecutive errors */
+
+	struct list_head	event_list;	/* hubs w/data or errs ready */
+	unsigned long		event_bits[1];	/* status change bitmask */
+	unsigned long		change_bits[1];	/* ports with logical connect
+							status change */
+	unsigned long		busy_bits[1];	/* ports being reset or
+							resumed */
+	unsigned long		removed_bits[1]; /* ports with a "removed"
+							device present */
+	unsigned long		wakeup_bits[1];	/* ports that have signaled
+							remote wakeup */
+#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
+#error event_bits[] is too short!
+#endif
+
+	struct usb_hub_descriptor *descriptor;	/* class descriptor */
+	struct usb_tt		tt;		/* Transaction Translator */
+
+	unsigned		mA_per_port;	/* current for each child */
+
+	unsigned		limited_power:1;
+	unsigned		quiescing:1;
+	unsigned		disconnected:1;
+
+	unsigned		has_indicators:1;
+	u8			indicator[USB_MAXCHILDREN];
+	struct delayed_work	leds;
+	struct delayed_work	init_work;
+	void			**port_owners;
+};
+
+static inline int hub_is_superspeed(struct usb_device *hdev)
+{
+	return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS);
+}
+
+/* Protect struct usb_device->state and ->children members
+ * Note: Both are also protected by ->dev.sem, except that ->state can
+ * 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);
+
+static struct task_struct *khubd_task;
+
+/* cycle leds on hubs that aren't blinking for attention */
+static bool blinkenlights = 0;
+module_param (blinkenlights, bool, S_IRUGO);
+MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
+
+/*
+ * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
+ * 10 seconds to send reply for the initial 64-byte descriptor request.
+ */
+/* define initial 64-byte descriptor request timeout in milliseconds */
+static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT;
+module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(initial_descriptor_timeout,
+		"initial 64-byte descriptor request timeout in milliseconds "
+		"(default 5000 - 5.0 seconds)");
+
+/*
+ * 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 bool 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 bool 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");
+
+/* Mutual exclusion for EHCI CF initialization.  This interferes with
+ * port reset on some companion controllers.
+ */
+DECLARE_RWSEM(ehci_cf_port_reset_rwsem);
+EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem);
+
+#define HUB_DEBOUNCE_TIMEOUT	1500
+#define HUB_DEBOUNCE_STEP	  25
+#define HUB_DEBOUNCE_STABLE	 100
+unsigned int usb_storage_id = 0;
+
+static int usb_reset_and_verify_device(struct usb_device *udev);
+
+static inline char *portspeed(struct usb_hub *hub, int portstatus)
+{
+	if (hub_is_superspeed(hub->hdev))
+		return "5.0 Gb/s";
+	if (portstatus & USB_PORT_STAT_HIGH_SPEED)
+    		return "480 Mb/s";
+	else if (portstatus & USB_PORT_STAT_LOW_SPEED)
+		return "1.5 Mb/s";
+	else
+		return "12 Mb/s";
+}
+
+/* Note that hdev or one of its children must be locked! */
+static struct usb_hub *hdev_to_hub(struct usb_device *hdev)
+{
+	if (!hdev || !hdev->actconfig)
+		return NULL;
+	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 i, ret, size;
+	unsigned dtype;
+
+	if (hub_is_superspeed(hdev)) {
+		dtype = USB_DT_SS_HUB;
+		size = USB_DT_SS_HUB_SIZE;
+	} else {
+		dtype = USB_DT_HUB;
+		size = sizeof(struct usb_hub_descriptor);
+	}
+
+	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,
+			dtype << 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 (struct work_struct *work)
+{
+	struct usb_hub		*hub =
+		container_of(work, struct usb_hub, leds.work);
+	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 || status == -EPIPE); 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 || status == -EPIPE); 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 int hub_port_status(struct usb_hub *hub, int port1,
+		u16 *status, u16 *change)
+{
+	int ret;
+
+	mutex_lock(&hub->status_mutex);
+	ret = get_port_status(hub->hdev, port1, &hub->status->port);
+	if (ret < 4) {
+		dev_err(hub->intfdev,
+			"%s failed (err = %d)\n", __func__, ret);
+		if (ret >= 0)
+			ret = -EIO;
+	} else {
+		*status = le16_to_cpu(hub->status->port.wPortStatus);
+		*change = le16_to_cpu(hub->status->port.wPortChange);
+
+		ret = 0;
+	}
+	mutex_unlock(&hub->status_mutex);
+	return ret;
+}
+
+static void kick_khubd(struct usb_hub *hub)
+{
+	unsigned long	flags;
+
+	spin_lock_irqsave(&hub_event_lock, flags);
+	if (!hub->disconnected && list_empty(&hub->event_list)) {
+		list_add_tail(&hub->event_list, &hub_event_list);
+
+		/* Suppress autosuspend until khubd runs */
+		usb_autopm_get_interface_no_resume(
+				to_usb_interface(hub->intfdev));
+		wake_up(&khubd_wait);
+	}
+	spin_unlock_irqrestore(&hub_event_lock, flags);
+}
+
+void usb_kick_khubd(struct usb_device *hdev)
+{
+	struct usb_hub *hub = hdev_to_hub(hdev);
+
+	if (hub)
+		kick_khubd(hub);
+}
+
+/*
+ * Let the USB core know that a USB 3.0 device has sent a Function Wake Device
+ * Notification, which indicates it had initiated remote wakeup.
+ *
+ * USB 3.0 hubs do not report the port link state change from U3 to U0 when the
+ * device initiates resume, so the USB core will not receive notice of the
+ * resume through the normal hub interrupt URB.
+ */
+void usb_wakeup_notification(struct usb_device *hdev,
+		unsigned int portnum)
+{
+	struct usb_hub *hub;
+
+	if (!hdev)
+		return;
+
+	hub = hdev_to_hub(hdev);
+	if (hub) {
+		set_bit(portnum, hub->wakeup_bits);
+		kick_khubd(hub);
+	}
+}
+EXPORT_SYMBOL_GPL(usb_wakeup_notification);
+
+/* completion function, fires on port status changes and various faults */
+static void hub_irq(struct urb *urb)
+{
+	struct usb_hub *hub = urb->context;
+	int status = urb->status;
+	unsigned i;
+	unsigned long bits;
+
+	switch (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", status);
+		if ((++hub->nerrors < 10) || hub->error)
+			goto resubmit;
+		hub->error = 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_sndctrlpipe(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_work(struct work_struct *work)
+{
+	struct usb_hub		*hub =
+		container_of(work, struct usb_hub, tt.clear_work);
+	unsigned long		flags;
+	int			limit = 100;
+
+	spin_lock_irqsave (&hub->tt.lock, flags);
+	while (--limit && !list_empty (&hub->tt.clear_list)) {
+		struct list_head	*next;
+		struct usb_tt_clear	*clear;
+		struct usb_device	*hdev = hub->hdev;
+		const struct hc_driver	*drv;
+		int			status;
+
+		next = hub->tt.clear_list.next;
+		clear = list_entry (next, 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);
+		if (status)
+			dev_err (&hdev->dev,
+				"clear tt %d (%04x) error %d\n",
+				clear->tt, clear->devinfo, status);
+
+		/* Tell the HCD, even if the operation failed */
+		drv = clear->hcd->driver;
+		if (drv->clear_tt_buffer_complete)
+			(drv->clear_tt_buffer_complete)(clear->hcd, clear->ep);
+
+		kfree(clear);
+		spin_lock_irqsave(&hub->tt.lock, flags);
+	}
+	spin_unlock_irqrestore (&hub->tt.lock, flags);
+}
+
+/**
+ * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
+ * @urb: an URB associated with the failed or incomplete split transaction
+ *
+ * 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.
+ */
+int usb_hub_clear_tt_buffer(struct urb *urb)
+{
+	struct usb_device	*udev = urb->dev;
+	int			pipe = urb->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, GFP_ATOMIC)) == NULL) {
+		dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
+		/* FIXME recover somehow ... RESET_TT? */
+		return -ENOMEM;
+	}
+
+	/* 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;
+
+	/* info for completion callback */
+	clear->hcd = bus_to_hcd(udev->bus);
+	clear->ep = urb->ep;
+
+	/* 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->clear_work);
+	spin_unlock_irqrestore (&tt->lock, flags);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer);
+
+/* If do_delay is false, return the number of milliseconds the caller
+ * needs to delay.
+ */
+/*CharlesTu,2012.09.14,improve resume time*/ 
+unsigned char usb_resume_flag=0;  
+static unsigned hub_power_on(struct usb_hub *hub, bool do_delay)
+{
+	int port1;
+	unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
+	unsigned delay;
+	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)
+		dev_dbg(hub->intfdev, "enabling power on all ports\n");
+	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);
+
+	/* Wait at least 100 msec for power to become stable */
+	delay = max(pgood_delay, (unsigned) 100);
+	if (do_delay)
+		if (!usb_resume_flag) {
+			 msleep(delay);
+		}
+	return delay;
+}
+
+static int hub_hub_status(struct usb_hub *hub,
+		u16 *status, u16 *change)
+{
+	int ret;
+
+	mutex_lock(&hub->status_mutex);
+	ret = get_hub_status(hub->hdev, &hub->status->hub);
+	if (ret < 0)
+		dev_err (hub->intfdev,
+			"%s failed (err = %d)\n", __func__, ret);
+	else {
+		*status = le16_to_cpu(hub->status->hub.wHubStatus);
+		*change = le16_to_cpu(hub->status->hub.wHubChange); 
+		ret = 0;
+	}
+	mutex_unlock(&hub->status_mutex);
+	return ret;
+}
+
+static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
+{
+	struct usb_device *hdev = hub->hdev;
+	int ret = 0;
+
+	if (hdev->children[port1-1] && set_state)
+		usb_set_device_state(hdev->children[port1-1],
+				USB_STATE_NOTATTACHED);
+	if (!hub->error && !hub_is_superspeed(hub->hdev))
+		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;
+}
+
+/*
+ * Disable a port and mark a logical connect-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
+	 *  - ... new call, TBD ...
+	 * That's easy if this hub can switch power per-port, and
+	 * khubd reactivates the port later (timer, SRP, etc).
+	 * Powerdown must be optional, because of reset/DFU.
+	 */
+
+	set_bit(port1, hub->change_bits);
+ 	kick_khubd(hub);
+}
+
+/**
+ * usb_remove_device - disable a device's port on its parent hub
+ * @udev: device to be disabled and removed
+ * Context: @udev locked, must be able to sleep.
+ *
+ * After @udev's port has been disabled, khubd is notified and it will
+ * see that the device has been disconnected.  When the device is
+ * physically unplugged and something is plugged in, the events will
+ * be received and processed normally.
+ */
+int usb_remove_device(struct usb_device *udev)
+{
+	struct usb_hub *hub;
+	struct usb_interface *intf;
+
+	if (!udev->parent)	/* Can't remove a root hub */
+		return -EINVAL;
+	hub = hdev_to_hub(udev->parent);
+	intf = to_usb_interface(hub->intfdev);
+
+	usb_autopm_get_interface(intf);
+	set_bit(udev->portnum, hub->removed_bits);
+	hub_port_logical_disconnect(hub, udev->portnum);
+	usb_autopm_put_interface(intf);
+	return 0;
+}
+
+enum hub_activation_type {
+	HUB_INIT, HUB_INIT2, HUB_INIT3,		/* INITs must come first */
+	HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME,
+};
+
+static void hub_init_func2(struct work_struct *ws);
+static void hub_init_func3(struct work_struct *ws);
+
+static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
+{
+	struct usb_device *hdev = hub->hdev;
+	struct usb_hcd *hcd;
+	int ret;
+	int port1;
+	int status;
+	bool need_debounce_delay = false;
+	unsigned delay;
+
+	/* Continue a partial initialization */
+	if (type == HUB_INIT2)
+		goto init2;
+	if (type == HUB_INIT3)
+		goto init3;
+
+	/* The superspeed hub except for root hub has to use Hub Depth
+	 * value as an offset into the route string to locate the bits
+	 * it uses to determine the downstream port number. So hub driver
+	 * should send a set hub depth request to superspeed hub after
+	 * the superspeed hub is set configuration in initialization or
+	 * reset procedure.
+	 *
+	 * After a resume, port power should still be on.
+	 * For any other type of activation, turn it on.
+	 */
+	if (type != HUB_RESUME) {
+		if (hdev->parent && hub_is_superspeed(hdev)) {
+			ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
+					HUB_SET_DEPTH, USB_RT_HUB,
+					hdev->level - 1, 0, NULL, 0,
+					USB_CTRL_SET_TIMEOUT);
+			if (ret < 0)
+				dev_err(hub->intfdev,
+						"set hub depth failed\n");
+		}
+
+		/* Speed up system boot by using a delayed_work for the
+		 * hub's initial power-up delays.  This is pretty awkward
+		 * and the implementation looks like a home-brewed sort of
+		 * setjmp/longjmp, but it saves at least 100 ms for each
+		 * root hub (assuming usbcore is compiled into the kernel
+		 * rather than as a module).  It adds up.
+		 *
+		 * This can't be done for HUB_RESUME or HUB_RESET_RESUME
+		 * because for those activation types the ports have to be
+		 * operational when we return.  In theory this could be done
+		 * for HUB_POST_RESET, but it's easier not to.
+		 */
+		if (type == HUB_INIT) {
+			delay = hub_power_on(hub, false);
+			PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2);
+			schedule_delayed_work(&hub->init_work,
+					msecs_to_jiffies(delay));
+
+			/* Suppress autosuspend until init is done */
+			usb_autopm_get_interface_no_resume(
+					to_usb_interface(hub->intfdev));
+			return;		/* Continues at init2: below */
+		} else if (type == HUB_RESET_RESUME) {
+			/* The internal host controller state for the hub device
+			 * may be gone after a host power loss on system resume.
+			 * Update the device's info so the HW knows it's a hub.
+			 */
+			hcd = bus_to_hcd(hdev->bus);
+			if (hcd->driver->update_hub_device) {
+				ret = hcd->driver->update_hub_device(hcd, hdev,
+						&hub->tt, GFP_NOIO);
+				if (ret < 0) {
+					dev_err(hub->intfdev, "Host not "
+							"accepting hub info "
+							"update.\n");
+					dev_err(hub->intfdev, "LS/FS devices "
+							"and hubs may not work "
+							"under this hub\n.");
+				}
+			}
+			hub_power_on(hub, true);
+		} else {
+			hub_power_on(hub, true);
+		}
+	}
+ init2:
+
+	/* Check each port and set hub->change_bits to let khubd know
+	 * which ports need attention.
+	 */
+	for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
+		struct usb_device *udev = hdev->children[port1-1];
+		u16 portstatus, portchange;
+
+		portstatus = portchange = 0;
+		status = hub_port_status(hub, port1, &portstatus, &portchange);
+		if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
+			dev_dbg(hub->intfdev,
+					"port %d: status %04x change %04x\n",
+					port1, portstatus, portchange);
+
+		/* After anything other than HUB_RESUME (i.e., initialization
+		 * or any sort of reset), every port should be disabled.
+		 * Unconnected ports should likewise be disabled (paranoia),
+		 * and so should ports for which we have no usb_device.
+		 */
+		if ((portstatus & USB_PORT_STAT_ENABLE) && (
+				type != HUB_RESUME ||
+				!(portstatus & USB_PORT_STAT_CONNECTION) ||
+				!udev ||
+				udev->state == USB_STATE_NOTATTACHED)) {
+			/*
+			 * USB3 protocol ports will automatically transition
+			 * to Enabled state when detect an USB3.0 device attach.
+			 * Do not disable USB3 protocol ports.
+			 */
+			if (!hub_is_superspeed(hdev)) {
+				clear_port_feature(hdev, port1,
+						   USB_PORT_FEAT_ENABLE);
+				portstatus &= ~USB_PORT_STAT_ENABLE;
+			} else {
+				/* Pretend that power was lost for USB3 devs */
+				portstatus &= ~USB_PORT_STAT_ENABLE;
+			}
+		}
+
+		/* Clear status-change flags; we'll debounce later */
+		if (portchange & USB_PORT_STAT_C_CONNECTION) {
+			if (!usb_resume_flag) {
+			need_debounce_delay = true;
+			}
+			clear_port_feature(hub->hdev, port1,
+					USB_PORT_FEAT_C_CONNECTION);
+		}
+		if (portchange & USB_PORT_STAT_C_ENABLE) {
+			
+				if (!usb_resume_flag) {
+					need_debounce_delay = true;
+				}
+			clear_port_feature(hub->hdev, port1,
+					USB_PORT_FEAT_C_ENABLE);
+		}
+		if ((portchange & USB_PORT_STAT_C_BH_RESET) &&
+				hub_is_superspeed(hub->hdev)) {
+			need_debounce_delay = true;
+			clear_port_feature(hub->hdev, port1,
+					USB_PORT_FEAT_C_BH_PORT_RESET);
+		}
+		/* We can forget about a "removed" device when there's a
+		 * physical disconnect or the connect status changes.
+		 */
+		if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
+				(portchange & USB_PORT_STAT_C_CONNECTION))
+			clear_bit(port1, hub->removed_bits);
+
+		if (!udev || udev->state == USB_STATE_NOTATTACHED) {
+			/* Tell khubd to disconnect the device or
+			 * check for a new connection
+			 */
+			if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
+				set_bit(port1, hub->change_bits);
+
+		} else if (portstatus & USB_PORT_STAT_ENABLE) {
+			bool port_resumed = (portstatus &
+					USB_PORT_STAT_LINK_STATE) ==
+				USB_SS_PORT_LS_U0;
+			/* The power session apparently survived the resume.
+			 * If there was an overcurrent or suspend change
+			 * (i.e., remote wakeup request), have khubd
+			 * take care of it.  Look at the port link state
+			 * for USB 3.0 hubs, since they don't have a suspend
+			 * change bit, and they don't set the port link change
+			 * bit on device-initiated resume.
+			 */
+			if (portchange || (hub_is_superspeed(hub->hdev) &&
+						port_resumed))
+				set_bit(port1, hub->change_bits);
+
+		} else if (udev->persist_enabled) {
+#ifdef CONFIG_PM
+			udev->reset_resume = 1;
+#endif
+			set_bit(port1, hub->change_bits);
+
+		} else {
+			/* The power session is gone; tell khubd */
+			usb_set_device_state(udev, USB_STATE_NOTATTACHED);
+			set_bit(port1, hub->change_bits);
+		}
+	}
+
+	/* If no port-status-change flags were set, we don't need any
+	 * debouncing.  If flags were set we can try to debounce the
+	 * ports all at once right now, instead of letting khubd do them
+	 * one at a time later on.
+	 *
+	 * If any port-status changes do occur during this delay, khubd
+	 * will see them later and handle them normally.
+	 */
+	if (need_debounce_delay) {
+		delay = HUB_DEBOUNCE_STABLE;
+
+		/* Don't do a long sleep inside a workqueue routine */
+		if (type == HUB_INIT2) {
+			PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3);
+			schedule_delayed_work(&hub->init_work,
+					msecs_to_jiffies(delay));
+			return;		/* Continues at init3: below */
+		} else {
+			msleep(delay);
+		}
+	}
+ init3:
+	hub->quiescing = 0;
+
+	status = usb_submit_urb(hub->urb, GFP_NOIO);
+	if (status < 0)
+		dev_err(hub->intfdev, "activate --> %d\n", status);
+	if (hub->has_indicators && blinkenlights)
+		schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
+
+	/* Scan all ports that need attention */
+	kick_khubd(hub);
+
+	/* Allow autosuspend if it was suppressed */
+	if (type <= HUB_INIT3)
+		usb_autopm_put_interface_async(to_usb_interface(hub->intfdev));
+}
+
+/* Implement the continuations for the delays above */
+static void hub_init_func2(struct work_struct *ws)
+{
+	struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
+
+	hub_activate(hub, HUB_INIT2);
+}
+
+static void hub_init_func3(struct work_struct *ws)
+{
+	struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
+
+	hub_activate(hub, HUB_INIT3);
+}
+
+enum hub_quiescing_type {
+	HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND
+};
+
+static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
+{
+	struct usb_device *hdev = hub->hdev;
+	int i;
+
+	cancel_delayed_work_sync(&hub->init_work);
+
+	/* khubd and related activity won't re-trigger */
+	hub->quiescing = 1;
+
+	if (type != HUB_SUSPEND) {
+		/* Disconnect all the children */
+		for (i = 0; i < hdev->maxchild; ++i) {
+			if (hdev->children[i])
+				usb_disconnect(&hdev->children[i]);
+		}
+	}
+
+	/* Stop khubd and related activity */
+	usb_kill_urb(hub->urb);
+	if (hub->has_indicators)
+		cancel_delayed_work_sync(&hub->leds);
+	if (hub->tt.hub)
+		cancel_work_sync(&hub->tt.clear_work);
+}
+
+/* caller has locked the hub device */
+static int hub_pre_reset(struct usb_interface *intf)
+{
+	struct usb_hub *hub = usb_get_intfdata(intf);
+
+	hub_quiesce(hub, HUB_PRE_RESET);
+	return 0;
+}
+
+/* caller has locked the hub device */
+static int hub_post_reset(struct usb_interface *intf)
+{
+	struct usb_hub *hub = usb_get_intfdata(intf);
+
+	hub_activate(hub, HUB_POST_RESET);
+	return 0;
+}
+
+static int hub_configure(struct usb_hub *hub,
+	struct usb_endpoint_descriptor *endpoint)
+{
+	struct usb_hcd *hcd;
+	struct usb_device *hdev = hub->hdev;
+	struct device *hub_dev = hub->intfdev;
+	u16 hubstatus, hubchange;
+	u16 wHubCharacteristics;
+	unsigned int pipe;
+	int maxp, ret;
+	char *message = "out of memory";
+
+	hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL);
+	if (!hub->buffer) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
+	if (!hub->status) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+	mutex_init(&hub->status_mutex);
+
+	hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
+	if (!hub->descriptor) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	/* Request the entire hub descriptor.
+	 * hub->descriptor can handle USB_MAXCHILDREN ports,
+	 * but the hub can/will return fewer bytes here.
+	 */
+	ret = get_hub_descriptor(hdev, 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");
+
+	hdev->children = kzalloc(hdev->maxchild *
+				sizeof(struct usb_device *), GFP_KERNEL);
+	hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL);
+	if (!hdev->children || !hub->port_owners) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
+
+	/* FIXME for USB 3.0, skip for now */
+	if ((wHubCharacteristics & HUB_CHAR_COMPOUND) &&
+			!(hub_is_superspeed(hdev))) {
+		int	i;
+		char	portstr [USB_MAXCHILDREN + 1];
+
+		for (i = 0; i < hdev->maxchild; i++)
+			portstr[i] = hub->descriptor->u.hs.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");
+
+	switch (wHubCharacteristics & HUB_CHAR_LPSM) {
+	case HUB_CHAR_COMMON_LPSM:
+		dev_dbg(hub_dev, "ganged power switching\n");
+		break;
+	case HUB_CHAR_INDV_PORT_LPSM:
+		dev_dbg(hub_dev, "individual port power switching\n");
+		break;
+	case HUB_CHAR_NO_LPSM:
+	case HUB_CHAR_LPSM:
+		dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
+		break;
+	}
+
+	switch (wHubCharacteristics & HUB_CHAR_OCPM) {
+	case HUB_CHAR_COMMON_OCPM:
+		dev_dbg(hub_dev, "global over-current protection\n");
+		break;
+	case HUB_CHAR_INDV_PORT_OCPM:
+		dev_dbg(hub_dev, "individual port over-current protection\n");
+		break;
+	case HUB_CHAR_NO_OCPM:
+	case HUB_CHAR_OCPM:
+		dev_dbg(hub_dev, "no over-current protection\n");
+		break;
+	}
+
+	spin_lock_init (&hub->tt.lock);
+	INIT_LIST_HEAD (&hub->tt.clear_list);
+	INIT_WORK(&hub->tt.clear_work, hub_tt_work);
+	switch (hdev->descriptor.bDeviceProtocol) {
+	case USB_HUB_PR_FS:
+		break;
+	case USB_HUB_PR_HS_SINGLE_TT:
+		dev_dbg(hub_dev, "Single TT\n");
+		hub->tt.hub = hdev;
+		break;
+	case USB_HUB_PR_HS_MULTI_TT:
+		ret = usb_set_interface(hdev, 0, 1);
+		if (ret == 0) {
+			dev_dbg(hub_dev, "TT per port\n");
+			hub->tt.multi = 1;
+		} else
+			dev_err(hub_dev, "Using single TT (err %d)\n",
+				ret);
+		hub->tt.hub = hdev;
+		break;
+	case USB_HUB_PR_SS:
+		/* USB 3.0 hubs don't have a TT */
+		break;
+	default:
+		dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
+			hdev->descriptor.bDeviceProtocol);
+		break;
+	}
+
+	/* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
+	switch (wHubCharacteristics & HUB_CHAR_TTTT) {
+		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);
+			}
+			break;
+		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);
+			break;
+		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);
+			break;
+		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);
+			break;
+	}
+
+	/* probe() zeroes hub->indicator[] */
+	if (wHubCharacteristics & HUB_CHAR_PORTIND) {
+		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);
+	if (ret < 2) {
+		message = "can't get hub status";
+		goto fail;
+	}
+	le16_to_cpus(&hubstatus);
+	if (hdev == hdev->bus->root_hub) {
+		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;
+		}
+	} else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
+		dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
+			hub->descriptor->bHubContrCurrent);
+		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;
+	}
+	if (hub->mA_per_port < 500)
+		dev_dbg(hub_dev, "%umA bus power budget for each child\n",
+				hub->mA_per_port);
+
+	/* Update the HCD's internal representation of this hub before khubd
+	 * starts getting port status changes for devices under the hub.
+	 */
+	hcd = bus_to_hcd(hdev->bus);
+	if (hcd->driver->update_hub_device) {
+		ret = hcd->driver->update_hub_device(hcd, hdev,
+				&hub->tt, GFP_KERNEL);
+		if (ret < 0) {
+			message = "can't update HCD hub info";
+			goto fail;
+		}
+	}
+
+	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");
+
+	if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
+		dev_dbg(hub_dev, "%sover-current condition exists\n",
+			(hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
+
+	/* set up the interrupt endpoint
+	 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
+	 * bytes as USB2.0[11.12.3] says because some hubs are known
+	 * to send more data (and thus cause overflow). For root hubs,
+	 * maxpktsize is defined in hcd.c's fake endpoint descriptors
+	 * to be big enough for at least USB_MAXCHILDREN ports. */
+	pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
+	maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
+
+	if (maxp > sizeof(*hub->buffer))
+		maxp = sizeof(*hub->buffer);
+
+	hub->urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!hub->urb) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
+		hub, endpoint->bInterval);
+
+	/* maybe cycle the hub leds */
+	if (hub->has_indicators && blinkenlights)
+		hub->indicator [0] = INDICATOR_CYCLE;
+
+	hub_activate(hub, HUB_INIT);
+	return 0;
+
+fail:
+	dev_err (hub_dev, "config failed, %s (err %d)\n",
+			message, ret);
+	/* hub_disconnect() frees urb and descriptor */
+	return ret;
+}
+
+static void hub_release(struct kref *kref)
+{
+	struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
+
+	usb_put_intf(to_usb_interface(hub->intfdev));
+	kfree(hub);
+}
+
+static unsigned highspeed_hubs;
+
+static void hub_disconnect(struct usb_interface *intf)
+{
+	struct usb_hub *hub = usb_get_intfdata(intf);
+	struct usb_device *hdev = interface_to_usbdev(intf);
+
+	/* Take the hub off the event list and don't let it be added again */
+	spin_lock_irq(&hub_event_lock);
+	if (!list_empty(&hub->event_list)) {
+		list_del_init(&hub->event_list);
+		usb_autopm_put_interface_no_suspend(intf);
+	}
+	hub->disconnected = 1;
+	spin_unlock_irq(&hub_event_lock);
+
+	/* Disconnect all children and quiesce the hub */
+	hub->error = 0;
+	hub_quiesce(hub, HUB_DISCONNECT);
+
+	usb_set_intfdata (intf, NULL);
+	hub->hdev->maxchild = 0;
+
+	if (hub->hdev->speed == USB_SPEED_HIGH)
+		highspeed_hubs--;
+
+	usb_free_urb(hub->urb);
+	kfree(hdev->children);
+	kfree(hub->port_owners);
+	kfree(hub->descriptor);
+	kfree(hub->status);
+	kfree(hub->buffer);
+
+	kref_put(&hub->kref, hub_release);
+}
+
+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);
+
+	/* Hubs have proper suspend/resume support. */
+	usb_enable_autosuspend(hdev);
+
+	if (hdev->level == MAX_TOPO_LEVEL) {
+		dev_err(&intf->dev,
+			"Unsupported bus topology: hub nested too deep\n");
+		return -E2BIG;
+	}
+
+#ifdef	CONFIG_USB_OTG_BLACKLIST_HUB
+	if (hdev->parent) {
+		dev_warn(&intf->dev, "ignoring external hub\n");
+		return -ENODEV;
+	}
+#endif
+
+	/* 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;
+
+	/* If it's not an interrupt in endpoint, we'd better punt! */
+	if (!usb_endpoint_is_int_in(endpoint))
+		goto descriptor_error;
+
+	/* We found a hub */
+	dev_info (&intf->dev, "USB hub found\n");
+
+	hub = kzalloc(sizeof(*hub), GFP_KERNEL);
+	if (!hub) {
+		dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
+		return -ENOMEM;
+	}
+
+	kref_init(&hub->kref);
+	INIT_LIST_HEAD(&hub->event_list);
+	hub->intfdev = &intf->dev;
+	hub->hdev = hdev;
+	INIT_DELAYED_WORK(&hub->leds, led_work);
+	INIT_DELAYED_WORK(&hub->init_work, NULL);
+	usb_get_intf(intf);
+
+	usb_set_intfdata (intf, hub);
+	intf->needs_remote_wakeup = 1;
+
+	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;
+	}
+}
+
+/*
+ * Allow user programs to claim ports on a hub.  When a device is attached
+ * to one of these "claimed" ports, the program will "own" the device.
+ */
+static int find_port_owner(struct usb_device *hdev, unsigned port1,
+		void ***ppowner)
+{
+	if (hdev->state == USB_STATE_NOTATTACHED)
+		return -ENODEV;
+	if (port1 == 0 || port1 > hdev->maxchild)
+		return -EINVAL;
+
+	/* This assumes that devices not managed by the hub driver
+	 * will always have maxchild equal to 0.
+	 */
+	*ppowner = &(hdev_to_hub(hdev)->port_owners[port1 - 1]);
+	return 0;
+}
+
+/* In the following three functions, the caller must hold hdev's lock */
+int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, void *owner)
+{
+	int rc;
+	void **powner;
+
+	rc = find_port_owner(hdev, port1, &powner);
+	if (rc)
+		return rc;
+	if (*powner)
+		return -EBUSY;
+	*powner = owner;
+	return rc;
+}
+
+int usb_hub_release_port(struct usb_device *hdev, unsigned port1, void *owner)
+{
+	int rc;
+	void **powner;
+
+	rc = find_port_owner(hdev, port1, &powner);
+	if (rc)
+		return rc;
+	if (*powner != owner)
+		return -ENOENT;
+	*powner = NULL;
+	return rc;
+}
+
+void usb_hub_release_all_ports(struct usb_device *hdev, void *owner)
+{
+	int n;
+	void **powner;
+
+	n = find_port_owner(hdev, 1, &powner);
+	if (n == 0) {
+		for (; n < hdev->maxchild; (++n, ++powner)) {
+			if (*powner == owner)
+				*powner = NULL;
+		}
+	}
+}
+
+/* The caller must hold udev's lock */
+bool usb_device_is_owned(struct usb_device *udev)
+{
+	struct usb_hub *hub;
+
+	if (udev->state == USB_STATE_NOTATTACHED || !udev->parent)
+		return false;
+	hub = hdev_to_hub(udev->parent);
+	return !!hub->port_owners[udev->portnum - 1];
+}
+
+
+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]);
+	}
+	if (udev->state == USB_STATE_SUSPENDED)
+		udev->active_duration -= jiffies;
+	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.
+ */
+
+extern char enable_ehci_wake;
+ 
+void usb_set_device_state(struct usb_device *udev,
+		enum usb_device_state new_state)
+{
+	unsigned long flags;
+	int wakeup = -1;
+
+	spin_lock_irqsave(&device_state_lock, flags);
+	if (udev->state == USB_STATE_NOTATTACHED)
+		;	/* do nothing */
+	else if (new_state != USB_STATE_NOTATTACHED) {
+
+		/* root hub wakeup capabilities are managed out-of-band
+		 * and may involve silicon errata ... ignore them here.
+		 */
+		if (udev->parent) {
+			if (udev->state == USB_STATE_SUSPENDED
+					|| new_state == USB_STATE_SUSPENDED)
+				;	/* No change to wakeup settings */
+			else if (new_state == USB_STATE_CONFIGURED)
+				wakeup = udev->actconfig->desc.bmAttributes
+					 & USB_CONFIG_ATT_WAKEUP;
+			else
+				wakeup = 0;
+		}
+		if (udev->state == USB_STATE_SUSPENDED &&
+			new_state != USB_STATE_SUSPENDED)
+			udev->active_duration -= jiffies;
+		else if (new_state == USB_STATE_SUSPENDED &&
+				udev->state != USB_STATE_SUSPENDED)
+			udev->active_duration += jiffies;
+		udev->state = new_state;
+	} else
+		recursively_mark_NOTATTACHED(udev);
+	spin_unlock_irqrestore(&device_state_lock, flags);
+	if (wakeup >= 0) {
+		device_set_wakeup_capable(&udev->dev, wakeup);
+		if (enable_ehci_wake)
+			device_wakeup_enable(&udev->dev);//gri
+	}
+}
+EXPORT_SYMBOL_GPL(usb_set_device_state);
+
+/*
+ * Choose a device number.
+ *
+ * Device numbers are used as filenames in usbfs.  On USB-1.1 and
+ * USB-2.0 buses they are also used as device addresses, however on
+ * USB-3.0 buses the address is assigned by the controller hardware
+ * and it usually is not the same as the device number.
+ *
+ * WUSB devices are simple: they have no hubs behind, so the mapping
+ * device <-> virtual port number becomes 1:1. Why? to simplify the
+ * life of the device connection logic in
+ * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
+ * handshake we need to assign a temporary address in the unauthorized
+ * space. For simplicity we use the first virtual port number found to
+ * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
+ * and that becomes it's address [X < 128] or its unauthorized address
+ * [X | 0x80].
+ *
+ * We add 1 as an offset to the one-based USB-stack port number
+ * (zero-based wusb virtual port index) for two reasons: (a) dev addr
+ * 0 is reserved by USB for default address; (b) Linux's USB stack
+ * uses always #1 for the root hub of the controller. So USB stack's
+ * port #1, which is wusb virtual-port #0 has address #2.
+ *
+ * Devices connected under xHCI are not as simple.  The host controller
+ * supports virtualization, so the hardware assigns device addresses and
+ * the HCD must setup data structures before issuing a set address
+ * command to the hardware.
+ */
+static void choose_devnum(struct usb_device *udev)
+{
+	int		devnum;
+	struct usb_bus	*bus = udev->bus;
+
+	/* If khubd ever becomes multithreaded, this will need a lock */
+	if (udev->wusb) {
+		devnum = udev->portnum + 1;
+		BUG_ON(test_bit(devnum, bus->devmap.devicemap));
+	} else {
+		/* Try to allocate the next devnum beginning at
+		 * bus->devnum_next. */
+		devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
+					    bus->devnum_next);
+		if (devnum >= 128)
+			devnum = find_next_zero_bit(bus->devmap.devicemap,
+						    128, 1);
+		bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
+	}
+	if (devnum < 128) {
+		set_bit(devnum, bus->devmap.devicemap);
+		udev->devnum = devnum;
+	}
+}
+
+static void release_devnum(struct usb_device *udev)
+{
+	if (udev->devnum > 0) {
+		clear_bit(udev->devnum, udev->bus->devmap.devicemap);
+		udev->devnum = -1;
+	}
+}
+
+static void update_devnum(struct usb_device *udev, int devnum)
+{
+	/* The address for a WUSB device is managed by wusbcore. */
+	if (!udev->wusb)
+		udev->devnum = devnum;
+}
+
+static void hub_free_dev(struct usb_device *udev)
+{
+	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+
+	/* Root hubs aren't real devices, so don't free HCD resources */
+	if (hcd->driver->free_dev && udev->parent)
+		hcd->driver->free_dev(hcd, udev);
+}
+
+/**
+ * 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;
+
+	int	wmt_usb_patch = 0;
+	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+	
+	if ((udev->portnum == 1) && (udev->parent == udev->bus->root_hub) 
+	 && ((udev->speed == 3) || (hcd->rsrc_start == 0xfe007b00)))
+		wmt_usb_patch = 1;
+		
+	
+	/* mark the device as inactive, so any further urb submissions for
+	 * this device (and any of its children) will fail immediately.
+	 * this quiesces everything except pending urbs.
+	 */
+	usb_set_device_state(udev, USB_STATE_NOTATTACHED);
+	dev_info(&udev->dev, "USB disconnect, device number %d\n",
+			udev->devnum);
+
+	usb_lock_device(udev);
+
+	/* Free up all the children before we remove this device */
+	for (i = 0; i < udev->maxchild; 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.
+	 */
+	dev_dbg (&udev->dev, "unregistering device\n");
+	usb_disable_device(udev, 0);
+	usb_hcd_synchronize_unlinks(udev);
+
+	usb_remove_ep_devs(&udev->ep0);
+	usb_unlock_device(udev);
+
+	/* Unregister the device.  The device driver is responsible
+	 * for de-configuring the device and invoking the remove-device
+	 * notifier chain (used by usbfs and possibly others).
+	 */
+	device_del(&udev->dev);
+
+	/* Free the device number and delete the parent's children[]
+	 * (or root_hub) pointer.
+	 */
+	release_devnum(udev);
+
+	/* Avoid races with recursively_mark_NOTATTACHED() */
+	spin_lock_irq(&device_state_lock);
+	*pdev = NULL;
+	spin_unlock_irq(&device_state_lock);
+
+	hub_free_dev(udev);
+
+	put_device(&udev->dev);
+	
+	if (wmt_usb_patch)
+		*(unsigned char *)0xfe11010e = ((*(unsigned char *)0xfe11010e & (~0x3)) | 0x2);	
+}
+
+#ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
+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);
+}
+
+static void announce_device(struct usb_device *udev)
+{
+	dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n",
+		le16_to_cpu(udev->descriptor.idVendor),
+		le16_to_cpu(udev->descriptor.idProduct));
+	dev_info(&udev->dev,
+		"New USB 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);
+}
+#else
+static inline void announce_device(struct usb_device *udev) { }
+#endif
+
+#ifdef	CONFIG_USB_OTG
+#include "otg_whitelist.h"
+#endif
+
+/**
+ * usb_enumerate_device_otg - FIXME (usbcore-internal)
+ * @udev: newly addressed device (in ADDRESS state)
+ *
+ * Finish enumeration for On-The-Go devices
+ */
+static int usb_enumerate_device_otg(struct usb_device *udev)
+{
+	int err = 0;
+
+#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 = NULL;
+		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) {
+				unsigned		port1 = udev->portnum;
+
+				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) {
+			err = usb_port_suspend(udev, PMSG_SUSPEND);
+			if (err < 0)
+				dev_dbg(&udev->dev, "HNP fail, %d\n", err);
+		}
+		err = -ENOTSUPP;
+		goto fail;
+	}
+fail:
+#endif
+	return err;
+}
+
+
+/**
+ * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
+ * @udev: newly addressed device (in ADDRESS state)
+ *
+ * This is only called by usb_new_device() and usb_authorize_device()
+ * and FIXME -- all comments that apply to them apply here wrt to
+ * environment.
+ *
+ * If the device is WUSB and not authorized, we don't attempt to read
+ * the string descriptors, as they will be errored out by the device
+ * until it has been authorized.
+ */
+static int usb_enumerate_device(struct usb_device *udev)
+{
+	int err;
+
+	if (udev->config == NULL) {
+		err = usb_get_configuration(udev);
+		if (err < 0) {
+			dev_err(&udev->dev, "can't read configurations, error %d\n",
+				err);
+			goto fail;
+		}
+	}
+	if (udev->wusb == 1 && udev->authorized == 0) {
+		udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
+		udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
+		udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
+	}
+	else {
+		/* read the standard strings and cache them if present */
+		udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
+		udev->manufacturer = usb_cache_string(udev,
+						      udev->descriptor.iManufacturer);
+		udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
+	}
+	err = usb_enumerate_device_otg(udev);
+fail:
+	return err;
+}
+
+static void set_usb_port_removable(struct usb_device *udev)
+{
+	struct usb_device *hdev = udev->parent;
+	struct usb_hub *hub;
+	u8 port = udev->portnum;
+	u16 wHubCharacteristics;
+	bool removable = true;
+
+	if (!hdev)
+		return;
+
+	hub = hdev_to_hub(udev->parent);
+
+	wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
+
+	if (!(wHubCharacteristics & HUB_CHAR_COMPOUND))
+		return;
+
+	if (hub_is_superspeed(hdev)) {
+		if (hub->descriptor->u.ss.DeviceRemovable & (1 << port))
+			removable = false;
+	} else {
+		if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8)))
+			removable = false;
+	}
+
+	if (removable)
+		udev->removable = USB_DEVICE_REMOVABLE;
+	else
+		udev->removable = USB_DEVICE_FIXED;
+}
+
+/**
+ * usb_new_device - perform initial device setup (usbcore-internal)
+ * @udev: newly addressed device (in ADDRESS state)
+ *
+ * This is called with devices which have been detected but not fully
+ * enumerated.  The device descriptor is available, but not descriptors
+ * for any device configuration.  The caller must have locked either
+ * the parent hub (if udev is a normal device) or else the
+ * usb_bus_list_lock (if udev is a root hub).  The parent's pointer to
+ * udev has already been installed, but udev is not yet visible through
+ * sysfs or other filesystem code.
+ *
+ * It will return if the device is configured properly or not.  Zero if
+ * the interface was registered with the driver core; else a negative
+ * errno value.
+ *
+ * This call is synchronous, and may not be used in an interrupt context.
+ *
+ * Only the hub driver or root-hub registrar should ever call this.
+ */
+int usb_new_device(struct usb_device *udev)
+{
+	int err;
+
+	if (udev->parent) {
+		/* Initialize non-root-hub device wakeup to disabled;
+		 * device (un)configuration controls wakeup capable
+		 * sysfs power/wakeup controls wakeup enabled/disabled
+		 */
+		device_init_wakeup(&udev->dev, 0);
+	}
+
+	/* Tell the runtime-PM framework the device is active */
+	pm_runtime_set_active(&udev->dev);
+	pm_runtime_get_noresume(&udev->dev);
+	pm_runtime_use_autosuspend(&udev->dev);
+	pm_runtime_enable(&udev->dev);
+
+	/* By default, forbid autosuspend for all devices.  It will be
+	 * allowed for hubs during binding.
+	 */
+	usb_disable_autosuspend(udev);
+
+	err = usb_enumerate_device(udev);	/* Read descriptors */
+	if (err < 0)
+		goto fail;
+	dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n",
+			udev->devnum, udev->bus->busnum,
+			(((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
+	/* export the usbdev device-node for libusb */
+	udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
+			(((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
+
+	/* Tell the world! */
+	announce_device(udev);
+
+	device_enable_async_suspend(&udev->dev);
+
+	/*
+	 * check whether the hub marks this port as non-removable. Do it
+	 * now so that platform-specific data can override it in
+	 * device_add()
+	 */
+	if (udev->parent)
+		set_usb_port_removable(udev);
+
+	/* Register the device.  The device driver is responsible
+	 * for configuring the device and invoking the add-device
+	 * notifier chain (used by usbfs and possibly others).
+	 */
+	err = device_add(&udev->dev);
+	if (err) {
+		dev_err(&udev->dev, "can't device_add, error %d\n", err);
+		goto fail;
+	}
+
+	(void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev);
+	usb_mark_last_busy(udev);
+	pm_runtime_put_sync_autosuspend(&udev->dev);
+	
+	{
+		struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+		
+		if ((udev->portnum == 1) && (udev->parent == udev->bus->root_hub)
+		&& ((udev->speed == 3) || (hcd->rsrc_start == 0xfe007b00)))
+			*(unsigned char *)0xfe11010e = ((*(unsigned char *)0xfe11010e & (~0x3)) | 0x1);
+	}
+	return err;
+
+fail:
+	usb_set_device_state(udev, USB_STATE_NOTATTACHED);
+	pm_runtime_disable(&udev->dev);
+	pm_runtime_set_suspended(&udev->dev);
+	return err;
+}
+
+
+/**
+ * usb_deauthorize_device - deauthorize a device (usbcore-internal)
+ * @usb_dev: USB device
+ *
+ * Move the USB device to a very basic state where interfaces are disabled
+ * and the device is in fact unconfigured and unusable.
+ *
+ * We share a lock (that we have) with device_del(), so we need to
+ * defer its call.
+ */
+int usb_deauthorize_device(struct usb_device *usb_dev)
+{
+	usb_lock_device(usb_dev);
+	if (usb_dev->authorized == 0)
+		goto out_unauthorized;
+
+	usb_dev->authorized = 0;
+	usb_set_configuration(usb_dev, -1);
+
+	kfree(usb_dev->product);
+	usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
+	kfree(usb_dev->manufacturer);
+	usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
+	kfree(usb_dev->serial);
+	usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
+
+	usb_destroy_configuration(usb_dev);
+	usb_dev->descriptor.bNumConfigurations = 0;
+
+out_unauthorized:
+	usb_unlock_device(usb_dev);
+	return 0;
+}
+
+
+int usb_authorize_device(struct usb_device *usb_dev)
+{
+	int result = 0, c;
+
+	usb_lock_device(usb_dev);
+	if (usb_dev->authorized == 1)
+		goto out_authorized;
+
+	result = usb_autoresume_device(usb_dev);
+	if (result < 0) {
+		dev_err(&usb_dev->dev,
+			"can't autoresume for authorization: %d\n", result);
+		goto error_autoresume;
+	}
+	result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
+	if (result < 0) {
+		dev_err(&usb_dev->dev, "can't re-read device descriptor for "
+			"authorization: %d\n", result);
+		goto error_device_descriptor;
+	}
+
+	kfree(usb_dev->product);
+	usb_dev->product = NULL;
+	kfree(usb_dev->manufacturer);
+	usb_dev->manufacturer = NULL;
+	kfree(usb_dev->serial);
+	usb_dev->serial = NULL;
+
+	usb_dev->authorized = 1;
+	result = usb_enumerate_device(usb_dev);
+	if (result < 0)
+		goto error_enumerate;
+	/* Choose and set the configuration.  This registers the interfaces
+	 * with the driver core and lets interface drivers bind to them.
+	 */
+	c = usb_choose_configuration(usb_dev);
+	if (c >= 0) {
+		result = usb_set_configuration(usb_dev, c);
+		if (result) {
+			dev_err(&usb_dev->dev,
+				"can't set config #%d, error %d\n", c, result);
+			/* This need not be fatal.  The user can try to
+			 * set other configurations. */
+		}
+	}
+	dev_info(&usb_dev->dev, "authorized to connect\n");
+
+error_enumerate:
+error_device_descriptor:
+	usb_autosuspend_device(usb_dev);
+error_autoresume:
+out_authorized:
+	usb_unlock_device(usb_dev);	// complements locktree
+	return result;
+}
+
+
+/* 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;
+}
+
+
+#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 == (int)old_scheme_first)
+
+#define HUB_ROOT_RESET_TIME	50	/* times are in msec */
+#define HUB_SHORT_RESET_TIME	10
+#define HUB_BH_RESET_TIME	50
+#define HUB_LONG_RESET_TIME	200
+#define HUB_RESET_TIMEOUT	500
+
+static int hub_port_reset(struct usb_hub *hub, int port1,
+			struct usb_device *udev, unsigned int delay, bool warm);
+
+/* Is a USB 3.0 port in the Inactive or Complinance Mode state?
+ * Port worm reset is required to recover
+ */
+static bool hub_port_warm_reset_required(struct usb_hub *hub, u16 portstatus)
+{
+	return hub_is_superspeed(hub->hdev) &&
+		(((portstatus & USB_PORT_STAT_LINK_STATE) ==
+		  USB_SS_PORT_LS_SS_INACTIVE) ||
+		 ((portstatus & USB_PORT_STAT_LINK_STATE) ==
+		  USB_SS_PORT_LS_COMP_MOD)) ;
+}
+
+static int hub_port_wait_reset(struct usb_hub *hub, int port1,
+			struct usb_device *udev, unsigned int delay, bool warm)
+{
+	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;
+
+		/*
+		 * Some buggy devices require a warm reset to be issued even
+		 * when the port appears not to be connected.
+		 */
+		if (!warm) {
+			/*
+			 * Some buggy devices can cause an NEC host controller
+			 * to transition to the "Error" state after a hot port
+			 * reset.  This will show up as the port state in
+			 * "Inactive", and the port may also report a
+			 * disconnect.  Forcing a warm port reset seems to make
+			 * the device work.
+			 *
+			 * See https://bugzilla.kernel.org/show_bug.cgi?id=41752
+			 */
+			if (hub_port_warm_reset_required(hub, portstatus)) {
+				int ret;
+
+				if ((portchange & USB_PORT_STAT_C_CONNECTION))
+					clear_port_feature(hub->hdev, port1,
+							USB_PORT_FEAT_C_CONNECTION);
+				if (portchange & USB_PORT_STAT_C_LINK_STATE)
+					clear_port_feature(hub->hdev, port1,
+							USB_PORT_FEAT_C_PORT_LINK_STATE);
+				if (portchange & USB_PORT_STAT_C_RESET)
+					clear_port_feature(hub->hdev, port1,
+							USB_PORT_FEAT_C_RESET);
+				dev_dbg(hub->intfdev, "hot reset failed, warm reset port %d\n",
+						port1);
+				ret = hub_port_reset(hub, port1,
+						udev, HUB_BH_RESET_TIME,
+						true);
+				if ((portchange & USB_PORT_STAT_C_CONNECTION))
+					clear_port_feature(hub->hdev, port1,
+							USB_PORT_FEAT_C_CONNECTION);
+				return ret;
+			}
+			/* Device went away? */
+			if (!(portstatus & USB_PORT_STAT_CONNECTION))
+				return -ENOTCONN;
+
+			/* bomb out completely if the connection bounced */
+			if ((portchange & USB_PORT_STAT_C_CONNECTION))
+				return -ENOTCONN;
+
+			/* if we`ve finished resetting, then break out of
+			 * the loop
+			 */
+			if (!(portstatus & USB_PORT_STAT_RESET) &&
+			    (portstatus & USB_PORT_STAT_ENABLE)) {
+				if (hub_is_wusb(hub))
+					udev->speed = USB_SPEED_WIRELESS;
+				else if (hub_is_superspeed(hub->hdev))
+					udev->speed = USB_SPEED_SUPER;
+				else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
+					udev->speed = USB_SPEED_HIGH;
+				else if (portstatus & USB_PORT_STAT_LOW_SPEED)
+					udev->speed = USB_SPEED_LOW;
+				else
+					udev->speed = USB_SPEED_FULL;
+				return 0;
+			}
+		} else {
+			if (portchange & USB_PORT_STAT_C_BH_RESET)
+				return 0;
+		}
+
+		/* 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 %sreset yet, waiting %dms\n",
+			port1, warm ? "warm " : "", delay);
+	}
+
+	return -EBUSY;
+}
+
+static void hub_port_finish_reset(struct usb_hub *hub, int port1,
+			struct usb_device *udev, int *status, bool warm)
+{
+	switch (*status) {
+	case 0:
+		if (!warm) {
+			struct usb_hcd *hcd;
+			/* TRSTRCY = 10 ms; plus some extra */
+			  msleep(10);  /*CharlesTu,2012.09.14,improve resume time*/
+			update_devnum(udev, 0);
+			hcd = bus_to_hcd(udev->bus);
+			if (hcd->driver->reset_device) {
+				*status = hcd->driver->reset_device(hcd, udev);
+				if (*status < 0) {
+					dev_err(&udev->dev, "Cannot reset "
+							"HCD device state\n");
+					break;
+				}
+			}
+		}
+		/* FALL THROUGH */
+	case -ENOTCONN:
+	case -ENODEV:
+		clear_port_feature(hub->hdev,
+				port1, USB_PORT_FEAT_C_RESET);
+		/* FIXME need disconnect() for NOTATTACHED device */
+		if (warm) {
+			clear_port_feature(hub->hdev, port1,
+					USB_PORT_FEAT_C_BH_PORT_RESET);
+			clear_port_feature(hub->hdev, port1,
+					USB_PORT_FEAT_C_PORT_LINK_STATE);
+		} else {
+			usb_set_device_state(udev, *status
+					? USB_STATE_NOTATTACHED
+					: USB_STATE_DEFAULT);
+		}
+		break;
+	}
+}
+
+/* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */
+static int hub_port_reset(struct usb_hub *hub, int port1,
+			struct usb_device *udev, unsigned int delay, bool warm)
+{
+	int i, status;
+
+	if (!warm) {
+		/* Block EHCI CF initialization during the port reset.
+		 * Some companion controllers don't like it when they mix.
+		 */
+		down_read(&ehci_cf_port_reset_rwsem);
+	} else {
+		if (!hub_is_superspeed(hub->hdev)) {
+			dev_err(hub->intfdev, "only USB3 hub support "
+						"warm reset\n");
+			return -EINVAL;
+		}
+	}
+
+	/* Reset the port */
+	for (i = 0; i < PORT_RESET_TRIES; i++) {
+		status = set_port_feature(hub->hdev, port1, (warm ?
+					USB_PORT_FEAT_BH_PORT_RESET :
+					USB_PORT_FEAT_RESET));
+		if (status) {
+			dev_err(hub->intfdev,
+					"cannot %sreset port %d (err = %d)\n",
+					warm ? "warm " : "", port1, status);
+		} else {
+			status = hub_port_wait_reset(hub, port1, udev, delay,
+								warm);
+			if (status && status != -ENOTCONN)
+				dev_dbg(hub->intfdev,
+						"port_wait_reset: err = %d\n",
+						status);
+		}
+
+		/* return on disconnect or reset */
+		if (status == 0 || status == -ENOTCONN || status == -ENODEV) {
+			hub_port_finish_reset(hub, port1, udev, &status, warm);
+			goto done;
+		}
+
+		dev_dbg (hub->intfdev,
+			"port %d not enabled, trying %sreset again...\n",
+			port1, warm ? "warm " : "");
+		delay = HUB_LONG_RESET_TIME;
+	}
+
+	dev_err (hub->intfdev,
+		"Cannot enable port %i.  Maybe the USB cable is bad?\n",
+		port1);
+
+done:
+	if (!warm)
+		up_read(&ehci_cf_port_reset_rwsem);
+
+	return status;
+}
+
+/* Check if a port is power on */
+static int port_is_power_on(struct usb_hub *hub, unsigned portstatus)
+{
+	int ret = 0;
+
+	if (hub_is_superspeed(hub->hdev)) {
+		if (portstatus & USB_SS_PORT_STAT_POWER)
+			ret = 1;
+	} else {
+		if (portstatus & USB_PORT_STAT_POWER)
+			ret = 1;
+	}
+
+	return ret;
+}
+
+#ifdef	CONFIG_PM
+
+/* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */
+static int port_is_suspended(struct usb_hub *hub, unsigned portstatus)
+{
+	int ret = 0;
+
+	if (hub_is_superspeed(hub->hdev)) {
+		if ((portstatus & USB_PORT_STAT_LINK_STATE)
+				== USB_SS_PORT_LS_U3)
+			ret = 1;
+	} else {
+		if (portstatus & USB_PORT_STAT_SUSPEND)
+			ret = 1;
+	}
+
+	return ret;
+}
+
+/* Determine whether the device on a port is ready for a normal resume,
+ * is ready for a reset-resume, or should be disconnected.
+ */
+static int check_port_resume_type(struct usb_device *udev,
+		struct usb_hub *hub, int port1,
+		int status, unsigned portchange, unsigned portstatus)
+{
+	/* Is the device still present? */
+	if (status || port_is_suspended(hub, portstatus) ||
+			!port_is_power_on(hub, portstatus) ||
+			!(portstatus & USB_PORT_STAT_CONNECTION)) {
+		if (status >= 0)
+			status = -ENODEV;
+	}
+
+	/* Can't do a normal resume if the port isn't enabled,
+	 * so try a reset-resume instead.
+	 */
+	else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) {
+		if (udev->persist_enabled)
+			udev->reset_resume = 1;
+		else
+			status = -ENODEV;
+	}
+
+	if (status) {
+		dev_dbg(hub->intfdev,
+				"port %d status %04x.%04x after resume, %d\n",
+				port1, portchange, portstatus, status);
+	} else if (udev->reset_resume) {
+
+		/* Late port handoff can set status-change bits */
+		if (portchange & USB_PORT_STAT_C_CONNECTION)
+			clear_port_feature(hub->hdev, port1,
+					USB_PORT_FEAT_C_CONNECTION);
+		if (portchange & USB_PORT_STAT_C_ENABLE)
+			clear_port_feature(hub->hdev, port1,
+					USB_PORT_FEAT_C_ENABLE);
+	}
+
+	return status;
+}
+
+#ifdef	CONFIG_USB_SUSPEND
+
+/*
+ * usb_port_suspend - suspend a usb device's upstream port
+ * @udev: device that's no longer in active use, not a root hub
+ * Context: must be able to sleep; device not locked; pm locks held
+ *
+ * Suspends a USB device that isn't in active use, conserving power.
+ * Devices may wake out of a suspend, if anything important happens,
+ * using the remote wakeup mechanism.  They may also be taken out of
+ * suspend by the host, using usb_port_resume().  It's also routine
+ * to disconnect devices while they are suspended.
+ *
+ * This only affects the USB hardware for a device; its interfaces
+ * (and, for hubs, child devices) must already have been suspended.
+ *
+ * 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.
+ *
+ * Suspending OTG devices may trigger HNP, if that's been enabled
+ * between a pair of dual-role devices.  That will change roles, such
+ * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
+ *
+ * Devices on USB hub ports have only one "suspend" state, corresponding
+ * to ACPI D2, "may cause the device to lose some context".
+ * State transitions include:
+ *
+ *   - suspend, resume ... when the VBUS power link stays live
+ *   - suspend, disconnect ... VBUS lost
+ *
+ * Once VBUS drop breaks the circuit, the port it's using has to go through
+ * normal re-enumeration procedures, starting with enabling VBUS power.
+ * Other than re-initializing the hub (plug/unplug, except for root hubs),
+ * Linux (2.6) currently has NO mechanisms to initiate that:  no khubd
+ * timer, no SRP, no requests through sysfs.
+ *
+ * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
+ * the root hub for their bus goes into global suspend ... so we don't
+ * (falsely) update the device power state to say it suspended.
+ *
+ * Returns 0 on success, else negative errno.
+ */
+int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
+{
+	struct usb_hub	*hub = hdev_to_hub(udev->parent);
+	int		port1 = udev->portnum;
+	int		status;
+
+	/* 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.
+	 */
+	if (udev->do_remote_wakeup) {
+		if (!hub_is_superspeed(hub->hdev)) {
+			status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+					USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
+					USB_DEVICE_REMOTE_WAKEUP, 0,
+					NULL, 0,
+					USB_CTRL_SET_TIMEOUT);
+		} else {
+			/* Assume there's only one function on the USB 3.0
+			 * device and enable remote wake for the first
+			 * interface. FIXME if the interface association
+			 * descriptor shows there's more than one function.
+			 */
+			status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+					USB_REQ_SET_FEATURE,
+					USB_RECIP_INTERFACE,
+					USB_INTRF_FUNC_SUSPEND,
+					USB_INTRF_FUNC_SUSPEND_RW |
+					USB_INTRF_FUNC_SUSPEND_LP,
+					NULL, 0,
+					USB_CTRL_SET_TIMEOUT);
+		}
+		if (status) {
+			dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
+					status);
+			/* bail if autosuspend is requested */
+			if (PMSG_IS_AUTO(msg))
+				return status;
+		}
+	}
+
+	/* disable USB2 hardware LPM */
+	if (udev->usb2_hw_lpm_enabled == 1)
+		usb_set_usb2_hardware_lpm(udev, 0);
+
+	/* see 7.1.7.6 */
+	if (hub_is_superspeed(hub->hdev))
+		status = set_port_feature(hub->hdev,
+				port1 | (USB_SS_PORT_LS_U3 << 3),
+				USB_PORT_FEAT_LINK_STATE);
+	else
+		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" */
+		if (udev->do_remote_wakeup)
+			(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);
+
+		/* Try to enable USB2 hardware LPM again */
+		if (udev->usb2_hw_lpm_capable == 1)
+			usb_set_usb2_hardware_lpm(udev, 1);
+
+		/* System sleep transitions should never fail */
+		if (!PMSG_IS_AUTO(msg))
+			status = 0;
+	} else {
+		/* device has up to 10 msec to fully suspend */
+		dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n",
+				(PMSG_IS_AUTO(msg) ? "auto-" : ""),
+				udev->do_remote_wakeup);
+		usb_set_device_state(udev, USB_STATE_SUSPENDED);
+		msleep(10);
+	}
+	usb_mark_last_busy(hub->hdev);
+	return status;
+}
+
+/*
+ * 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.  This routine kicks in shortly after
+ * 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.
+ *
+ * If @udev->reset_resume is set then the device is reset before the
+ * status check is done.
+ */
+static int finish_port_resume(struct usb_device *udev)
+{
+	int	status = 0;
+	u16	devstatus;
+
+	/* caller owns the udev device lock */
+	dev_dbg(&udev->dev, "%s\n",
+		udev->reset_resume ? "finish reset-resume" : "finish resume");
+
+	/* 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 not to reset a suspended port if the attached
+	 * device is enabled for remote wakeup.  Hence the reset
+	 * operation is carried out here, after the port has been
+	 * resumed.
+	 */
+	if (udev->reset_resume)
+ retry_reset_resume:
+		status = usb_reset_and_verify_device(udev);
+
+ 	/* 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.
+	 */
+	if (status == 0) {
+		devstatus = 0;
+		status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
+		if (status >= 0)
+			status = (status > 0 ? 0 : -ENODEV);
+
+		/* If a normal resume failed, try doing a reset-resume */
+		if (status && !udev->reset_resume && udev->persist_enabled) {
+			dev_dbg(&udev->dev, "retry with reset-resume\n");
+			udev->reset_resume = 1;
+			goto retry_reset_resume;
+		}
+	}
+
+	if (status) {
+		dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
+				status);
+	} else if (udev->actconfig) {
+		le16_to_cpus(&devstatus);
+		if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
+			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);
+			if (status)
+				dev_dbg(&udev->dev,
+					"disable remote wakeup, status %d\n",
+					status);
+		}
+		status = 0;
+	}
+	return status;
+}
+
+/*
+ * usb_port_resume - re-activate a suspended usb device's upstream port
+ * @udev: device to re-activate, not a root hub
+ * Context: must be able to sleep; device not locked; pm locks held
+ *
+ * This will re-activate the suspended device, increasing power usage
+ * while letting drivers communicate again with its endpoints.
+ * USB resume explicitly guarantees that the power session between
+ * the host and the device is the same as it was when the device
+ * suspended.
+ *
+ * If @udev->reset_resume is set then this routine won't check that the
+ * port is still enabled.  Furthermore, finish_port_resume() above will
+ * reset @udev.  The end result is that a broken power session can be
+ * recovered and @udev will appear to persist across a loss of VBUS power.
+ *
+ * For example, if a host controller doesn't maintain VBUS suspend current
+ * during a system sleep or is reset when the system wakes up, all the USB
+ * power sessions below it will be broken.  This is especially troublesome
+ * for mass-storage devices containing mounted filesystems, since the
+ * device will appear to have disconnected and all the memory mappings
+ * to it will be lost.  Using the USB_PERSIST facility, the device can be
+ * made to appear as if it had not disconnected.
+ *
+ * This facility can be dangerous.  Although usb_reset_and_verify_device() makes
+ * every effort to insure that the same device is present after the
+ * reset as before, it cannot provide a 100% guarantee.  Furthermore it's
+ * quite possible for a device to remain unaltered but its media to be
+ * changed.  If the user replaces a flash memory card while the system is
+ * asleep, he will have only himself to blame when the filesystem on the
+ * new card is corrupted and the system crashes.
+ *
+ * Returns 0 on success, else negative errno.
+ */
+int usb_port_resume(struct usb_device *udev, pm_message_t msg)
+{
+	struct usb_hub	*hub = hdev_to_hub(udev->parent);
+	int		port1 = udev->portnum;
+	int		status;
+	u16		portchange, portstatus;
+
+	/* Skip the initial Clear-Suspend step for a remote wakeup */
+	status = hub_port_status(hub, port1, &portstatus, &portchange);
+	if (status == 0 && !port_is_suspended(hub, portstatus))
+		goto SuspendCleared;
+
+	// dev_dbg(hub->intfdev, "resume port %d\n", port1);
+
+	set_bit(port1, hub->busy_bits);
+
+	/* see 7.1.7.7; affects power usage, but not budgeting */
+	if (hub_is_superspeed(hub->hdev))
+		status = set_port_feature(hub->hdev,
+				port1 | (USB_SS_PORT_LS_U0 << 3),
+				USB_PORT_FEAT_LINK_STATE);
+	else
+		status = clear_port_feature(hub->hdev,
+				port1, USB_PORT_FEAT_SUSPEND);
+	if (status) {
+		dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
+				port1, status);
+	} else {
+		/* drive resume for at least 20 msec */
+		dev_dbg(&udev->dev, "usb %sresume\n",
+				(PMSG_IS_AUTO(msg) ? "auto-" : ""));
+		msleep(25);
+
+		/* Virtual root hubs can trigger on GET_PORT_STATUS to
+		 * stop resume signaling.  Then finish the resume
+		 * sequence.
+		 */
+		status = hub_port_status(hub, port1, &portstatus, &portchange);
+
+		/* TRSMRCY = 10 msec */
+		msleep(10);
+	}
+
+ SuspendCleared:
+	if (status == 0) {
+		if (hub_is_superspeed(hub->hdev)) {
+			if (portchange & USB_PORT_STAT_C_LINK_STATE)
+				clear_port_feature(hub->hdev, port1,
+					USB_PORT_FEAT_C_PORT_LINK_STATE);
+		} else {
+			if (portchange & USB_PORT_STAT_C_SUSPEND)
+				clear_port_feature(hub->hdev, port1,
+						USB_PORT_FEAT_C_SUSPEND);
+		}
+	}
+
+	clear_bit(port1, hub->busy_bits);
+
+	status = check_port_resume_type(udev,
+			hub, port1, status, portchange, portstatus);
+	if (status == 0)
+		status = finish_port_resume(udev);
+	if (status < 0) {
+		dev_dbg(&udev->dev, "can't resume, status %d\n", status);
+		hub_port_logical_disconnect(hub, port1);
+	} else  {
+		/* Try to enable USB2 hardware LPM */
+		if (udev->usb2_hw_lpm_capable == 1)
+			usb_set_usb2_hardware_lpm(udev, 1);
+	}
+
+	return status;
+}
+
+/* caller has locked udev */
+int usb_remote_wakeup(struct usb_device *udev)
+{
+	int	status = 0;
+
+	if (udev->state == USB_STATE_SUSPENDED) {
+		dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
+		status = usb_autoresume_device(udev);
+		if (status == 0) {
+			/* Let the drivers do their thing, then... */
+			usb_autosuspend_device(udev);
+		}
+	}
+	return status;
+}
+
+#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, pm_message_t msg)
+{
+	return 0;
+}
+
+/* However we may need to do a reset-resume */
+
+int usb_port_resume(struct usb_device *udev, pm_message_t msg)
+{
+	struct usb_hub	*hub = hdev_to_hub(udev->parent);
+	int		port1 = udev->portnum;
+	int		status;
+	u16		portchange, portstatus;
+
+	status = hub_port_status(hub, port1, &portstatus, &portchange);
+	status = check_port_resume_type(udev,
+			hub, port1, status, portchange, portstatus);
+
+	if (status) {
+		dev_dbg(&udev->dev, "can't resume, status %d\n", status);
+		hub_port_logical_disconnect(hub, port1);
+	} else if (udev->reset_resume) {
+		dev_dbg(&udev->dev, "reset-resume\n");
+		status = usb_reset_and_verify_device(udev);
+	}
+	return status;
+}
+
+#endif
+
+static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
+{
+	struct usb_hub		*hub = usb_get_intfdata (intf);
+	struct usb_device	*hdev = hub->hdev;
+	unsigned		port1;
+	int			status;
+
+	/* Warn if children aren't already suspended */
+	for (port1 = 1; port1 <= hdev->maxchild; port1++) {
+		struct usb_device	*udev;
+
+		udev = hdev->children [port1-1];
+		if (udev && udev->can_submit) {
+			dev_warn(&intf->dev, "port %d nyet suspended\n", port1);
+			if (PMSG_IS_AUTO(msg))
+				return -EBUSY;
+		}
+	}
+	if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) {
+		/* Enable hub to send remote wakeup for all ports. */
+		for (port1 = 1; port1 <= hdev->maxchild; port1++) {
+			status = set_port_feature(hdev,
+					port1 |
+					USB_PORT_FEAT_REMOTE_WAKE_CONNECT |
+					USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT |
+					USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT,
+					USB_PORT_FEAT_REMOTE_WAKE_MASK);
+		}
+	}
+
+	dev_dbg(&intf->dev, "%s\n", __func__);
+
+	/* stop khubd and related activity */
+	hub_quiesce(hub, HUB_SUSPEND);
+	return 0;
+}
+
+static int hub_resume(struct usb_interface *intf)
+{
+	struct usb_hub *hub = usb_get_intfdata(intf);
+
+	dev_dbg(&intf->dev, "%s\n", __func__);
+	hub_activate(hub, HUB_RESUME);
+	return 0;
+}
+
+static int hub_reset_resume(struct usb_interface *intf)
+{
+	struct usb_hub *hub = usb_get_intfdata(intf);
+	usb_resume_flag = 1;
+	dev_dbg(&intf->dev, "%s\n", __func__);
+	hub_activate(hub, HUB_RESET_RESUME);
+	usb_resume_flag = 0;
+	return 0;
+}
+
+/**
+ * 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 @rhdev as having lost power.
+ * When the hub driver is resumed it will take notice and carry out
+ * power-session recovery for all the "USB-PERSIST"-enabled child devices;
+ * the others will be disconnected.
+ */
+void usb_root_hub_lost_power(struct usb_device *rhdev)
+{
+	dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
+	rhdev->reset_resume = 1;
+}
+EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
+
+#else	/* CONFIG_PM */
+
+#define hub_suspend		NULL
+#define hub_resume		NULL
+#define hub_reset_resume	NULL
+#endif
+
+
+/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
+ *
+ * Between connect detection and reset signaling there must be a delay
+ * of 100ms at least for debounce and power-settling.  The corresponding
+ * timer shall restart whenever the downstream port detects a disconnect.
+ * 
+ * Apparently there are some bluetooth and irda-dongles and a number of
+ * low-speed devices for which this debounce period may last over a second.
+ * Not covered by the spec - but easy to deal with.
+ *
+ * This implementation uses a 1500ms total debounce timeout; if the
+ * connection isn't stable by then it returns -ETIMEDOUT.  It checks
+ * every 25ms for transient disconnects.  When the port status has been
+ * unchanged for 100ms it returns the port status.
+ */
+static int hub_port_debounce(struct usb_hub *hub, int port1)
+{
+	int ret;
+	int total_time, stable_time = 0;
+	u16 portchange, portstatus;
+	unsigned connection = 0xffff;
+
+	for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
+		ret = hub_port_status(hub, port1, &portstatus, &portchange);
+		if (ret < 0)
+			return ret;
+
+		if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
+		     (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
+			stable_time += HUB_DEBOUNCE_STEP;
+			if (stable_time >= HUB_DEBOUNCE_STABLE)
+				break;
+		} else {
+			stable_time = 0;
+			connection = portstatus & USB_PORT_STAT_CONNECTION;
+		}
+
+		if (portchange & USB_PORT_STAT_C_CONNECTION) {
+			clear_port_feature(hub->hdev, port1,
+					USB_PORT_FEAT_C_CONNECTION);
+		}
+
+		if (total_time >= HUB_DEBOUNCE_TIMEOUT)
+			break;
+		msleep(HUB_DEBOUNCE_STEP);
+	}
+
+	dev_dbg (hub->intfdev,
+		"debounce: port %d: total %dms stable %dms status 0x%x\n",
+		port1, total_time, stable_time, portstatus);
+
+	if (stable_time < HUB_DEBOUNCE_STABLE)
+		return -ETIMEDOUT;
+	return portstatus;
+}
+
+void usb_ep0_reinit(struct usb_device *udev)
+{
+	usb_disable_endpoint(udev, 0 + USB_DIR_IN, true);
+	usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true);
+	usb_enable_endpoint(udev, &udev->ep0, true);
+}
+EXPORT_SYMBOL_GPL(usb_ep0_reinit);
+
+#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 devnum)
+{
+	int retval;
+	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+
+	/*
+	 * The host controller will choose the device address,
+	 * instead of the core having chosen it earlier
+	 */
+	if (!hcd->driver->address_device && devnum <= 1)
+		return -EINVAL;
+	if (udev->state == USB_STATE_ADDRESS)
+		return 0;
+	if (udev->state != USB_STATE_DEFAULT)
+		return -EINVAL;
+	if (hcd->driver->address_device)
+		retval = hcd->driver->address_device(hcd, udev);
+	else
+		retval = usb_control_msg(udev, usb_sndaddr0pipe(),
+				USB_REQ_SET_ADDRESS, 0, devnum, 0,
+				NULL, 0, USB_CTRL_SET_TIMEOUT);
+	if (retval == 0) {
+		update_devnum(udev, devnum);
+		/* Device now using proper address. */
+		usb_set_device_state(udev, USB_STATE_ADDRESS);
+		usb_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_and_verify_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)
+{
+	static DEFINE_MUTEX(usb_address0_mutex);
+
+	struct usb_device	*hdev = hub->hdev;
+	struct usb_hcd		*hcd = bus_to_hcd(hdev->bus);
+	int			i, j, retval;
+	unsigned		delay = HUB_SHORT_RESET_TIME;
+	enum usb_device_speed	oldspeed = udev->speed;
+	const char		*speed;
+	int			devnum = udev->devnum;
+
+	/* 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;
+
+	mutex_lock(&usb_address0_mutex);
+
+	/* Reset the device; full speed may morph to high speed */
+	/* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
+	retval = hub_port_reset(hub, port1, udev, delay, false);
+	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.
+	 * For Wireless USB devices, ep0 max packet is always 512 (tho
+	 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
+	 */
+	switch (udev->speed) {
+	case USB_SPEED_SUPER:
+	case USB_SPEED_WIRELESS:	/* fixed at 512 */
+		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
+		break;
+	case USB_SPEED_HIGH:		/* fixed at 64 */
+		udev->ep0.desc.wMaxPacketSize = 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 = cpu_to_le16(64);
+		break;
+	case USB_SPEED_LOW:		/* fixed at 8 */
+		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8);
+		break;
+	default:
+		goto fail;
+	}
+
+	if (udev->speed == USB_SPEED_WIRELESS)
+		speed = "variable speed Wireless";
+	else
+		speed = usb_speed_string(udev->speed);
+
+	if (udev->speed != USB_SPEED_SUPER)
+		dev_info(&udev->dev,
+				"%s %s USB device number %d using %s\n",
+				(udev->config) ? "reset" : "new", speed,
+				devnum, udev->bus->controller->driver->name);
+
+	/* 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) {
+		if (!hub->tt.hub) {
+			dev_err(&udev->dev, "parent hub has no TT\n");
+			retval = -EINVAL;
+			goto fail;
+		}
+		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) && !(hcd->driver->flags & HCD_USB3)) {
+			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;
+			}
+
+			/* Retry on all errors; some devices are flakey.
+			 * 255 is for WUSB devices, we actually need to use
+			 * 512 (WUSB1.0[4.8.1]).
+			 */
+			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,
+					initial_descriptor_timeout);
+				switch (buf->bMaxPacketSize0) {
+				case 8: case 16: case 32: case 64: case 255:
+					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, false);
+			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/64, error %d\n",
+					r);
+				retval = -EMSGSIZE;
+				continue;
+			}
+#undef GET_DESCRIPTOR_BUFSIZE
+		}
+
+ 		/*
+ 		 * If device is WUSB, we already assigned an
+ 		 * unauthorized address in the Connect Ack sequence;
+ 		 * authorization will assign the final address.
+ 		 */
+		if (udev->wusb == 0) {
+			for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
+				retval = hub_set_address(udev, devnum);
+				if (retval >= 0)
+					break;
+				msleep(200);
+			}
+			if (retval < 0) {
+				dev_err(&udev->dev,
+					"device not accepting address %d, error %d\n",
+					devnum, retval);
+				goto fail;
+			}
+			if (udev->speed == USB_SPEED_SUPER) {
+				devnum = udev->devnum;
+				dev_info(&udev->dev,
+						"%s SuperSpeed USB device number %d using %s\n",
+						(udev->config) ? "reset" : "new",
+						devnum, udev->bus->controller->driver->name);
+			}
+
+			/* 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) && !(hcd->driver->flags & HCD_USB3))
+				break;
+  		}
+
+		retval = usb_get_device_descriptor(udev, 8);
+		if (retval < 8) {
+			dev_err(&udev->dev,
+					"device descriptor read/8, error %d\n",
+					retval);
+			if (retval >= 0)
+				retval = -EMSGSIZE;
+		} else {
+			retval = 0;
+			break;
+		}
+	}
+	if (retval)
+		goto fail;
+
+	/*
+	 * Some superspeed devices have finished the link training process
+	 * and attached to a superspeed hub port, but the device descriptor
+	 * got from those devices show they aren't superspeed devices. Warm
+	 * reset the port attached by the devices can fix them.
+	 */
+	if ((udev->speed == USB_SPEED_SUPER) &&
+			(le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) {
+		dev_err(&udev->dev, "got a wrong device descriptor, "
+				"warm reset device\n");
+		hub_port_reset(hub, port1, udev,
+				HUB_BH_RESET_TIME, true);
+		retval = -EINVAL;
+		goto fail;
+	}
+
+	if (udev->descriptor.bMaxPacketSize0 == 0xff ||
+			udev->speed == USB_SPEED_SUPER)
+		i = 512;
+	else
+		i = udev->descriptor.bMaxPacketSize0;
+	if (usb_endpoint_maxp(&udev->ep0.desc) != i) {
+		if (udev->speed == USB_SPEED_LOW ||
+				!(i == 8 || i == 16 || i == 32 || i == 64)) {
+			dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i);
+			retval = -EMSGSIZE;
+			goto fail;
+		}
+		if (udev->speed == USB_SPEED_FULL)
+			dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
+		else
+			dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i);
+		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
+		usb_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/all, error %d\n",
+			retval);
+		if (retval >= 0)
+			retval = -ENOMSG;
+		goto fail;
+	}
+
+	if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) {
+		retval = usb_get_bos_descriptor(udev);
+		if (!retval) {
+			if (udev->bos->ext_cap && (USB_LPM_SUPPORT &
+				le32_to_cpu(udev->bos->ext_cap->bmAttributes)))
+					udev->lpm_capable = 1;
+		}
+	}
+
+	retval = 0;
+	/* notify HCD that we have a device connected and addressed */
+	if (hcd->driver->update_device)
+		hcd->driver->update_device(hcd, udev);
+fail:
+	if (retval) {
+		hub_port_disable(hub, port1, 0);
+		update_devnum(udev, devnum);	/* for disconnect processing */
+	}
+	mutex_unlock(&usb_address0_mutex);
+	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, GFP_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_delayed_work (&hub->leds, 0);
+		}
+	}
+	kfree(qual);
+}
+
+static unsigned
+hub_power_remaining (struct usb_hub *hub)
+{
+	struct usb_device *hdev = hub->hdev;
+	int remaining;
+	int port1;
+
+	if (!hub->limited_power)
+		return 0;
+
+	remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
+	for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
+		struct usb_device	*udev = hdev->children[port1 - 1];
+		int			delta;
+
+		if (!udev)
+			continue;
+
+		/* Unconfigured devices may not use more than 100mA,
+		 * or 8mA for OTG ports */
+		if (udev->actconfig)
+			delta = udev->actconfig->desc.bMaxPower * 2;
+		else if (port1 != udev->bus->otg_port || hdev->parent)
+			delta = 100;
+		else
+			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);
+		remaining -= delta;
+	}
+	if (remaining < 0) {
+		dev_warn(hub->intfdev, "%dmA over power budget!\n",
+			- remaining);
+		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_and_verify_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;
+	struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
+	unsigned wHubCharacteristics =
+			le16_to_cpu(hub->descriptor->wHubCharacteristics);
+	struct usb_device *udev;
+	int status, i;
+
+	dev_dbg (hub_dev,
+		"port %d, status %04x, change %04x, %s\n",
+		port1, portstatus, portchange, portspeed(hub, portstatus));
+
+	if (hub->has_indicators) {
+		set_port_led(hub, port1, HUB_LED_AUTO);
+		hub->indicator[port1-1] = INDICATOR_AUTO;
+	}
+
+#ifdef	CONFIG_USB_OTG
+	/* during HNP, don't repeat the debounce */
+	if (hdev->bus->is_b_host)
+		portchange &= ~(USB_PORT_STAT_C_CONNECTION |
+				USB_PORT_STAT_C_ENABLE);
+#endif
+
+	/* Try to resuscitate an existing device */
+	udev = hdev->children[port1-1];
+	if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&
+			udev->state != USB_STATE_NOTATTACHED) {
+		usb_lock_device(udev);
+		if (portstatus & USB_PORT_STAT_ENABLE) {
+			status = 0;		/* Nothing to do */
+
+#ifdef CONFIG_USB_SUSPEND
+		} else if (udev->state == USB_STATE_SUSPENDED &&
+				udev->persist_enabled) {
+			/* For a suspended device, treat this as a
+			 * remote wakeup event.
+			 */
+			status = usb_remote_wakeup(udev);
+#endif
+
+		} else {
+			status = -ENODEV;	/* Don't resuscitate */
+		}
+		usb_unlock_device(udev);
+
+		if (status == 0) {
+			clear_bit(port1, hub->change_bits);
+			return;
+		}
+	}
+
+	/* Disconnect any existing devices under this port */
+	if (udev)
+		usb_disconnect(&hdev->children[port1-1]);
+	clear_bit(port1, hub->change_bits);
+
+	/* We can forget about a "removed" device when there's a physical
+	 * disconnect or the connect status changes.
+	 */
+	if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
+			(portchange & USB_PORT_STAT_C_CONNECTION))
+		clear_bit(port1, hub->removed_bits);
+
+	if (portchange & (USB_PORT_STAT_C_CONNECTION |
+				USB_PORT_STAT_C_ENABLE)) {
+		status = hub_port_debounce(hub, port1);
+		if (status < 0) {
+			if (printk_ratelimit())
+				dev_err(hub_dev, "connect-debounce failed, "
+						"port %d disabled\n", port1);
+			portstatus &= ~USB_PORT_STAT_CONNECTION;
+		} else {
+			portstatus = status;
+		}
+	}
+
+	/* Return now if debouncing failed or nothing is connected or
+	 * the device was "removed".
+	 */
+	if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
+			test_bit(port1, hub->removed_bits)) {
+
+		/* maybe switch power back on (e.g. root hub was reset) */
+		if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
+				&& !port_is_power_on(hub, portstatus))
+			set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
+
+		if (portstatus & USB_PORT_STAT_ENABLE)
+  			goto done;
+		return;
+	}
+
+	for (i = 0; i < SET_CONFIG_TRIES; i++) {
+
+		/* reallocate for each attempt, since references
+		 * to the previous one can escape in various ways
+		 */
+		udev = usb_alloc_dev(hdev, hdev->bus, port1);
+		if (!udev) {
+			dev_err (hub_dev,
+				"couldn't allocate port %d usb_device\n",
+				port1);
+			goto done;
+		}
+
+		usb_set_device_state(udev, USB_STATE_POWERED);
+ 		udev->bus_mA = hub->mA_per_port;
+		udev->level = hdev->level + 1;
+		udev->wusb = hub_is_wusb(hub);
+
+		/* Only USB 3.0 devices are connected to SuperSpeed hubs. */
+		if (hub_is_superspeed(hub->hdev))
+			udev->speed = USB_SPEED_SUPER;
+		else
+			udev->speed = USB_SPEED_UNKNOWN;
+
+		choose_devnum(udev);
+		if (udev->devnum <= 0) {
+			status = -ENOTCONN;	/* Don't retry */
+			goto loop;
+		}
+
+		/* reset (non-USB 3.0 devices) and get descriptor */
+		status = hub_port_init(hub, udev, port1, i);
+		if (status < 0)
+			goto loop;
+
+		usb_detect_quirks(udev);
+		if (udev->quirks & USB_QUIRK_DELAY_INIT)
+			msleep(1000);
+
+		/* 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
+				&& udev->bus_mA <= 100) {
+			u16	devstat;
+
+			status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
+					&devstat);
+			if (status < 2) {
+				dev_dbg(&udev->dev, "get status %d ?\n", status);
+				goto loop_disable;
+			}
+			le16_to_cpus(&devstat);
+			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_delayed_work (&hub->leds, 0);
+				}
+				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)
+			dev_dbg(hub_dev, "%dmA power budget left\n", status);
+
+		return;
+
+loop_disable:
+		hub_port_disable(hub, port1, 1);
+loop:
+		usb_ep0_reinit(udev);
+		release_devnum(udev);
+		hub_free_dev(udev);
+		usb_put_dev(udev);
+		if ((status == -ENOTCONN) || (status == -ENOTSUPP))
+			break;
+	}
+	if (hub->hdev->parent ||
+			!hcd->driver->port_handed_over ||
+			!(hcd->driver->port_handed_over)(hcd, port1))
+		dev_err(hub_dev, "unable to enumerate USB device on port %d\n",
+				port1);
+ 
+done:
+	hub_port_disable(hub, port1, 1);
+	if (hcd->driver->relinquish_port && !hub->hdev->parent)
+		hcd->driver->relinquish_port(hcd, port1);
+}
+
+/* Returns 1 if there was a remote wakeup and a connect status change. */
+static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port,
+		u16 portstatus, u16 portchange)
+{
+	struct usb_device *hdev;
+	struct usb_device *udev;
+	int connect_change = 0;
+	int ret;
+
+	hdev = hub->hdev;
+	udev = hdev->children[port-1];
+	if (!hub_is_superspeed(hdev)) {
+		if (!(portchange & USB_PORT_STAT_C_SUSPEND))
+			return 0;
+		clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND);
+	} else {
+		if (!udev || udev->state != USB_STATE_SUSPENDED ||
+				 (portstatus & USB_PORT_STAT_LINK_STATE) !=
+				 USB_SS_PORT_LS_U0)
+			return 0;
+	}
+
+	if (udev) {
+		/* TRSMRCY = 10 msec */
+		msleep(10);
+
+		usb_lock_device(udev);
+		ret = usb_remote_wakeup(udev);
+		usb_unlock_device(udev);
+		if (ret < 0)
+			connect_change = 1;
+	} else {
+		ret = -ENODEV;
+		hub_port_disable(hub, port, 1);
+	}
+	dev_dbg(hub->intfdev, "resume on port %d, status %d\n",
+			port, ret);
+	return connect_change;
+}
+
+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,j = 0;
+	int connect_change, wakeup_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);
+		kref_get(&hub->kref);
+		spin_unlock_irq(&hub_event_lock);
+
+		hdev = hub->hdev;
+		hub_dev = hub->intfdev;
+		intf = to_usb_interface(hub_dev);
+		dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
+				hdev->state, hub->descriptor
+					? hub->descriptor->bNbrPorts
+					: 0,
+				/* NOTE: expects max 15 ports... */
+				(u16) hub->change_bits[0],
+				(u16) hub->event_bits[0]);
+
+		/* Lock the device, then check to see if we were
+		 * disconnected while waiting for the lock to succeed. */
+		usb_lock_device(hdev);
+		if (unlikely(hub->disconnected))
+			goto loop_disconnected;
+
+		/* If the hub has died, clean up after it */
+		if (hdev->state == USB_STATE_NOTATTACHED) {
+			hub->error = -ENODEV;
+			hub_quiesce(hub, HUB_DISCONNECT);
+			goto loop;
+		}
+
+		/* Autoresume */
+		ret = usb_autopm_get_interface(intf);
+		if (ret) {
+			dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
+			goto loop;
+		}
+
+		/* If this is an inactive hub, do nothing */
+		if (hub->quiescing)
+			goto loop_autopm;
+
+		if (hub->error) {
+			dev_dbg (hub_dev, "resetting for error %d\n",
+				hub->error);
+
+			ret = usb_reset_device(hdev);
+			if (ret) {
+				dev_dbg (hub_dev,
+					"error resetting hub: %d\n", ret);
+				goto loop_autopm;
+			}
+
+			hub->nerrors = 0;
+			hub->error = 0;
+		}
+
+		/* deal with other port status changes */
+                
+		//for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
+		for (j = 1; j <= hub->descriptor->bNbrPorts; j++) {
+					i = j;
+			if (hub->descriptor->bNbrPorts > 2 )  {
+				if (usb_storage_id)
+					i = (j + usb_storage_id -2 ) % hub->descriptor->bNbrPorts + 1 ;
+			
+			};
+				
+
+			if (test_bit(i, hub->busy_bits))
+				continue;
+			connect_change = test_bit(i, hub->change_bits);
+			wakeup_change = test_and_clear_bit(i, hub->wakeup_bits);
+			if (!test_and_clear_bit(i, hub->event_bits) &&
+					!connect_change && !wakeup_change)
+				continue;
+
+			ret = hub_port_status(hub, i,
+					&portstatus, &portchange);
+			if (ret < 0)
+				continue;
+
+			if (portchange & USB_PORT_STAT_C_CONNECTION) {
+				clear_port_feature(hdev, i,
+					USB_PORT_FEAT_C_CONNECTION);
+				connect_change = 1;
+			}
+
+			if (portchange & USB_PORT_STAT_C_ENABLE) {
+				if (!connect_change)
+					dev_dbg (hub_dev,
+						"port %d enable change, "
+						"status %08x\n",
+						i, portstatus);
+				clear_port_feature(hdev, i,
+					USB_PORT_FEAT_C_ENABLE);
+
+				/*
+				 * EM interference sometimes causes badly
+				 * shielded USB devices to be shutdown by
+				 * the hub, this hack enables them again.
+				 * Works at least with mouse driver. 
+				 */
+				if (!(portstatus & USB_PORT_STAT_ENABLE)
+				    && !connect_change
+				    && hdev->children[i-1]) {
+					dev_err (hub_dev,
+					    "port %i "
+					    "disabled by hub (EMI?), "
+					    "re-enabling...\n",
+						i);
+					connect_change = 1;
+				}
+			}
+
+			if (hub_handle_remote_wakeup(hub, i,
+						portstatus, portchange))
+				connect_change = 1;
+
+			if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
+				u16 status = 0;
+				u16 unused;
+
+				dev_dbg(hub_dev, "over-current change on port "
+					"%d\n", i);
+				clear_port_feature(hdev, i,
+					USB_PORT_FEAT_C_OVER_CURRENT);
+				msleep(100);	/* Cool down */
+				hub_power_on(hub, true);
+				hub_port_status(hub, i, &status, &unused);
+				if (status & USB_PORT_STAT_OVERCURRENT)
+					dev_err(hub_dev, "over-current "
+						"condition on port %d\n", i);
+			}
+
+			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 ((portchange & USB_PORT_STAT_C_BH_RESET) &&
+					hub_is_superspeed(hub->hdev)) {
+				dev_dbg(hub_dev,
+					"warm reset change on port %d\n",
+					i);
+				clear_port_feature(hdev, i,
+					USB_PORT_FEAT_C_BH_PORT_RESET);
+			}
+			if (portchange & USB_PORT_STAT_C_LINK_STATE) {
+				clear_port_feature(hub->hdev, i,
+						USB_PORT_FEAT_C_PORT_LINK_STATE);
+			}
+			if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) {
+				dev_warn(hub_dev,
+					"config error on port %d\n",
+					i);
+				clear_port_feature(hub->hdev, i,
+						USB_PORT_FEAT_C_PORT_CONFIG_ERROR);
+			}
+
+			/* Warm reset a USB3 protocol port if it's in
+			 * SS.Inactive state.
+			 */
+			if (hub_port_warm_reset_required(hub, portstatus)) {
+				dev_dbg(hub_dev, "warm reset port %d\n", i);
+				hub_port_reset(hub, i, NULL,
+						HUB_BH_RESET_TIME, true);
+			}
+
+			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);
+				if (hubstatus & HUB_STATUS_LOCAL_POWER)
+					/* FIXME: Is this always true? */
+					hub->limited_power = 1;
+				else
+					hub->limited_power = 0;
+			}
+			if (hubchange & HUB_CHANGE_OVERCURRENT) {
+				u16 status = 0;
+				u16 unused;
+
+				dev_dbg(hub_dev, "over-current change\n");
+				clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
+				msleep(500);	/* Cool down */
+                        	hub_power_on(hub, true);
+				hub_hub_status(hub, &status, &unused);
+				if (status & HUB_STATUS_OVERCURRENT)
+					dev_err(hub_dev, "over-current "
+						"condition\n");
+			}
+		}
+
+ loop_autopm:
+		/* Balance the usb_autopm_get_interface() above */
+		usb_autopm_put_interface_no_suspend(intf);
+ loop:
+		/* Balance the usb_autopm_get_interface_no_resume() in
+		 * kick_khubd() and allow autosuspend.
+		 */
+		usb_autopm_put_interface(intf);
+ loop_disconnected:
+		usb_unlock_device(hdev);
+		kref_put(&hub->kref, hub_release);
+
+        } /* end while (1) */
+}
+
+static int hub_thread(void *__unused)
+{
+	/* khubd needs to be freezable to avoid intefering with USB-PERSIST
+	 * port handover.  Otherwise it might see that a full-speed device
+	 * was gone before the EHCI controller had handed its port over to
+	 * the companion full-speed controller.
+	 */
+	set_freezable();
+
+	do {
+		hub_events();
+		wait_event_freezable(khubd_wait,
+				!list_empty(&hub_event_list) ||
+				kthread_should_stop());
+	} while (!kthread_should_stop() || !list_empty(&hub_event_list));
+
+	pr_debug("%s: khubd exiting\n", usbcore_name);
+	return 0;
+}
+
+static const 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,
+	.reset_resume =	hub_reset_resume,
+	.pre_reset =	hub_pre_reset,
+	.post_reset =	hub_post_reset,
+	.unlocked_ioctl = hub_ioctl,
+	.id_table =	hub_id_table,
+	.supports_autosuspend =	1,
+};
+
+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;
+	}
+
+	khubd_task = kthread_run(hub_thread, NULL, "khubd");
+	if (!IS_ERR(khubd_task))
+		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)
+{
+	kthread_stop(khubd_task);
+
+	/*
+	 * 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 descriptors_changed(struct usb_device *udev,
+		struct usb_device_descriptor *old_device_descriptor)
+{
+	int		changed = 0;
+	unsigned	index;
+	unsigned	serial_len = 0;
+	unsigned	len;
+	unsigned	old_length;
+	int		length;
+	char		*buf;
+
+	if (memcmp(&udev->descriptor, old_device_descriptor,
+			sizeof(*old_device_descriptor)) != 0)
+		return 1;
+
+	/* Since the idVendor, idProduct, and bcdDevice values in the
+	 * device descriptor haven't changed, we will assume the
+	 * Manufacturer and Product strings haven't changed either.
+	 * But the SerialNumber string could be different (e.g., a
+	 * different flash card of the same brand).
+	 */
+	if (udev->serial)
+		serial_len = strlen(udev->serial) + 1;
+
+	len = serial_len;
+	for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
+		old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
+		len = max(len, old_length);
+	}
+
+	buf = kmalloc(len, GFP_NOIO);
+	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++) {
+		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);
+			changed = 1;
+			break;
+		}
+		if (memcmp (buf, udev->rawdescriptors[index], old_length)
+				!= 0) {
+			dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
+				index,
+				((struct usb_config_descriptor *) buf)->
+					bConfigurationValue);
+			changed = 1;
+			break;
+		}
+	}
+
+	if (!changed && serial_len) {
+		length = usb_string(udev, udev->descriptor.iSerialNumber,
+				buf, serial_len);
+		if (length + 1 != serial_len) {
+			dev_dbg(&udev->dev, "serial string error %d\n",
+					length);
+			changed = 1;
+		} else if (memcmp(buf, udev->serial, length) != 0) {
+			dev_dbg(&udev->dev, "serial string changed\n");
+			changed = 1;
+		}
+	}
+
+	kfree(buf);
+	return changed;
+}
+
+/**
+ * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
+ * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
+ *
+ * WARNING - don't use this routine to reset a composite device
+ * (one with multiple interfaces owned by separate drivers)!
+ * Use usb_reset_device() instead.
+ *
+ * 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().
+ *
+ * Locking exception: This routine may also be called from within an
+ * autoresume handler.  Such usage won't conflict with other tasks
+ * holding the device lock because these tasks should always call
+ * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
+ */
+static int usb_reset_and_verify_device(struct usb_device *udev)
+{
+	struct usb_device		*parent_hdev = udev->parent;
+	struct usb_hub			*parent_hub;
+	struct usb_hcd			*hcd = bus_to_hcd(udev->bus);
+	struct usb_device_descriptor	descriptor = udev->descriptor;
+	int 				i, ret = 0;
+	int				port1 = udev->portnum;
+
+	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_restart() */
+		dev_dbg(&udev->dev, "%s for root hub!\n", __func__);
+		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. */
+		usb_ep0_reinit(udev);
+		ret = hub_port_init(parent_hub, udev, port1, i);
+		if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
+			break;
+	}
+	clear_bit(port1, parent_hub->busy_bits);
+
+	if (ret < 0)
+		goto re_enumerate;
+ 
+	/* Device might have changed firmware (DFU or similar) */
+	if (descriptors_changed(udev, &descriptor)) {
+		dev_info(&udev->dev, "device firmware changed\n");
+		udev->descriptor = descriptor;	/* for disconnect() calls */
+		goto re_enumerate;
+  	}
+
+	/* Restore the device's previous configuration */
+	if (!udev->actconfig)
+		goto done;
+
+	mutex_lock(hcd->bandwidth_mutex);
+	ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL);
+	if (ret < 0) {
+		dev_warn(&udev->dev,
+				"Busted HC?  Not enough HCD resources for "
+				"old configuration.\n");
+		mutex_unlock(hcd->bandwidth_mutex);
+		goto re_enumerate;
+	}
+	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);
+		mutex_unlock(hcd->bandwidth_mutex);
+		goto re_enumerate;
+  	}
+	mutex_unlock(hcd->bandwidth_mutex);
+	usb_set_device_state(udev, USB_STATE_CONFIGURED);
+
+	/* Put interfaces back into the same altsettings as before.
+	 * Don't bother to send the Set-Interface request for interfaces
+	 * that were already in altsetting 0; besides being unnecessary,
+	 * many devices can't handle it.  Instead just reset the host-side
+	 * endpoint state.
+	 */
+	for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
+		struct usb_host_config *config = udev->actconfig;
+		struct usb_interface *intf = config->interface[i];
+		struct usb_interface_descriptor *desc;
+
+		desc = &intf->cur_altsetting->desc;
+		if (desc->bAlternateSetting == 0) {
+			usb_disable_interface(udev, intf, true);
+			usb_enable_interface(udev, intf, true);
+			ret = 0;
+		} else {
+			/* Let the bandwidth allocation function know that this
+			 * device has been reset, and it will have to use
+			 * alternate setting 0 as the current alternate setting.
+			 */
+			intf->resetting_device = 1;
+			ret = usb_set_interface(udev, desc->bInterfaceNumber,
+					desc->bAlternateSetting);
+			intf->resetting_device = 0;
+		}
+		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;
+}
+
+/**
+ * usb_reset_device - warn interface drivers and perform a USB port reset
+ * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
+ *
+ * Warns all drivers bound to registered interfaces (using their pre_reset
+ * method), performs the port reset, and then lets the drivers know that
+ * the reset is over (using their post_reset method).
+ *
+ * Return value is the same as for usb_reset_and_verify_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().
+ *
+ * If an interface is currently being probed or disconnected, we assume
+ * its driver knows how to handle resets.  For all other interfaces,
+ * if the driver doesn't have pre_reset and post_reset methods then
+ * we attempt to unbind it and rebind afterward.
+ */
+int usb_reset_device(struct usb_device *udev)
+{
+	int ret;
+	int i;
+	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;
+	}
+
+	/* Prevent autosuspend during the reset */
+	usb_autoresume_device(udev);
+
+	if (config) {
+		for (i = 0; i < config->desc.bNumInterfaces; ++i) {
+			struct usb_interface *cintf = config->interface[i];
+			struct usb_driver *drv;
+			int unbind = 0;
+
+			if (cintf->dev.driver) {
+				drv = to_usb_driver(cintf->dev.driver);
+				if (drv->pre_reset && drv->post_reset)
+					unbind = (drv->pre_reset)(cintf);
+				else if (cintf->condition ==
+						USB_INTERFACE_BOUND)
+					unbind = 1;
+				if (unbind)
+					usb_forced_unbind_intf(cintf);
+			}
+		}
+	}
+
+	ret = usb_reset_and_verify_device(udev);
+
+	if (config) {
+		for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
+			struct usb_interface *cintf = config->interface[i];
+			struct usb_driver *drv;
+			int rebind = cintf->needs_binding;
+
+			if (!rebind && cintf->dev.driver) {
+				drv = to_usb_driver(cintf->dev.driver);
+				if (drv->post_reset)
+					rebind = (drv->post_reset)(cintf);
+				else if (cintf->condition ==
+						USB_INTERFACE_BOUND)
+					rebind = 1;
+			}
+			if (ret == 0 && rebind)
+				usb_rebind_intf(cintf);
+		}
+	}
+
+	usb_autosuspend_device(udev);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(usb_reset_device);
+
+
+/**
+ * usb_queue_reset_device - Reset a USB device from an atomic context
+ * @iface: USB interface belonging to the device to reset
+ *
+ * This function can be used to reset a USB device from an atomic
+ * context, where usb_reset_device() won't work (as it blocks).
+ *
+ * Doing a reset via this method is functionally equivalent to calling
+ * usb_reset_device(), except for the fact that it is delayed to a
+ * workqueue. This means that any drivers bound to other interfaces
+ * might be unbound, as well as users from usbfs in user space.
+ *
+ * Corner cases:
+ *
+ * - Scheduling two resets at the same time from two different drivers
+ *   attached to two different interfaces of the same device is
+ *   possible; depending on how the driver attached to each interface
+ *   handles ->pre_reset(), the second reset might happen or not.
+ *
+ * - If a driver is unbound and it had a pending reset, the reset will
+ *   be cancelled.
+ *
+ * - This function can be called during .probe() or .disconnect()
+ *   times. On return from .disconnect(), any pending resets will be
+ *   cancelled.
+ *
+ * There is no no need to lock/unlock the @reset_ws as schedule_work()
+ * does its own.
+ *
+ * NOTE: We don't do any reference count tracking because it is not
+ *     needed. The lifecycle of the work_struct is tied to the
+ *     usb_interface. Before destroying the interface we cancel the
+ *     work_struct, so the fact that work_struct is queued and or
+ *     running means the interface (and thus, the device) exist and
+ *     are referenced.
+ */
+void usb_queue_reset_device(struct usb_interface *iface)
+{
+	schedule_work(&iface->reset_ws);
+}
+EXPORT_SYMBOL_GPL(usb_queue_reset_device);