1/*
   2 * USB hub driver.
   3 *
   4 * (C) Copyright 1999 Linus Torvalds
   5 * (C) Copyright 1999 Johannes Erdfelt
   6 * (C) Copyright 1999 Gregory P. Smith
   7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
   8 *
 
   9 */
  10
  11#include <linux/kernel.h>
  12#include <linux/errno.h>
  13#include <linux/module.h>
  14#include <linux/moduleparam.h>
  15#include <linux/completion.h>
  16#include <linux/sched.h>
  17#include <linux/list.h>
  18#include <linux/slab.h>
 
  19#include <linux/ioctl.h>
  20#include <linux/usb.h>
  21#include <linux/usbdevice_fs.h>
  22#include <linux/usb/hcd.h>
 
 
  23#include <linux/usb/quirks.h>
  24#include <linux/kthread.h>
  25#include <linux/mutex.h>
  26#include <linux/freezer.h>
 
 
  27
  28#include <asm/uaccess.h>
 
  29#include <asm/byteorder.h>
  30
  31#include "usb.h"
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  32
  33/* if we are in debug mode, always announce new devices */
  34#ifdef DEBUG
  35#ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
  36#define CONFIG_USB_ANNOUNCE_NEW_DEVICES
  37#endif
  38#endif
  39
  40struct usb_hub {
  41	struct device		*intfdev;	/* the "interface" device */
  42	struct usb_device	*hdev;
  43	struct kref		kref;
  44	struct urb		*urb;		/* for interrupt polling pipe */
  45
  46	/* buffer for urb ... with extra space in case of babble */
  47	char			(*buffer)[8];
  48	union {
  49		struct usb_hub_status	hub;
  50		struct usb_port_status	port;
  51	}			*status;	/* buffer for status reports */
  52	struct mutex		status_mutex;	/* for the status buffer */
  53
  54	int			error;		/* last reported error */
  55	int			nerrors;	/* track consecutive errors */
  56
  57	struct list_head	event_list;	/* hubs w/data or errs ready */
  58	unsigned long		event_bits[1];	/* status change bitmask */
  59	unsigned long		change_bits[1];	/* ports with logical connect
  60							status change */
  61	unsigned long		busy_bits[1];	/* ports being reset or
  62							resumed */
  63	unsigned long		removed_bits[1]; /* ports with a "removed"
  64							device present */
  65#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
  66#error event_bits[] is too short!
  67#endif
  68
  69	struct usb_hub_descriptor *descriptor;	/* class descriptor */
  70	struct usb_tt		tt;		/* Transaction Translator */
  71
  72	unsigned		mA_per_port;	/* current for each child */
  73
  74	unsigned		limited_power:1;
  75	unsigned		quiescing:1;
  76	unsigned		disconnected:1;
  77
  78	unsigned		has_indicators:1;
  79	u8			indicator[USB_MAXCHILDREN];
  80	struct delayed_work	leds;
  81	struct delayed_work	init_work;
  82	void			**port_owners;
  83};
  84
  85static inline int hub_is_superspeed(struct usb_device *hdev)
  86{
  87	return (hdev->descriptor.bDeviceProtocol == 3);
  88}
  89
  90/* Protect struct usb_device->state and ->children members
  91 * Note: Both are also protected by ->dev.sem, except that ->state can
  92 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
  93static DEFINE_SPINLOCK(device_state_lock);
  94
  95/* khubd's worklist and its lock */
  96static DEFINE_SPINLOCK(hub_event_lock);
  97static LIST_HEAD(hub_event_list);	/* List of hubs needing servicing */
  98
  99/* Wakes up khubd */
 100static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
 101
 102static struct task_struct *khubd_task;
 
 103
 104/* cycle leds on hubs that aren't blinking for attention */
 105static int blinkenlights = 0;
 106module_param (blinkenlights, bool, S_IRUGO);
 107MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
 108
 109/*
 110 * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
 111 * 10 seconds to send reply for the initial 64-byte descriptor request.
 112 */
 113/* define initial 64-byte descriptor request timeout in milliseconds */
 114static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT;
 115module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR);
 116MODULE_PARM_DESC(initial_descriptor_timeout,
 117		"initial 64-byte descriptor request timeout in milliseconds "
 118		"(default 5000 - 5.0 seconds)");
 119
 120/*
 121 * As of 2.6.10 we introduce a new USB device initialization scheme which
 122 * closely resembles the way Windows works.  Hopefully it will be compatible
 123 * with a wider range of devices than the old scheme.  However some previously
 124 * working devices may start giving rise to "device not accepting address"
 125 * errors; if that happens the user can try the old scheme by adjusting the
 126 * following module parameters.
 127 *
 128 * For maximum flexibility there are two boolean parameters to control the
 129 * hub driver's behavior.  On the first initialization attempt, if the
 130 * "old_scheme_first" parameter is set then the old scheme will be used,
 131 * otherwise the new scheme is used.  If that fails and "use_both_schemes"
 132 * is set, then the driver will make another attempt, using the other scheme.
 133 */
 134static int old_scheme_first = 0;
 135module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
 136MODULE_PARM_DESC(old_scheme_first,
 137		 "start with the old device initialization scheme");
 138
 139static int use_both_schemes = 1;
 140module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
 141MODULE_PARM_DESC(use_both_schemes,
 142		"try the other device initialization scheme if the "
 143		"first one fails");
 144
 145/* Mutual exclusion for EHCI CF initialization.  This interferes with
 146 * port reset on some companion controllers.
 147 */
 148DECLARE_RWSEM(ehci_cf_port_reset_rwsem);
 149EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem);
 150
 151#define HUB_DEBOUNCE_TIMEOUT	1500
 152#define HUB_DEBOUNCE_STEP	  25
 153#define HUB_DEBOUNCE_STABLE	 100
 154
 155
 156static int usb_reset_and_verify_device(struct usb_device *udev);
 
 
 
 157
 158static inline char *portspeed(struct usb_hub *hub, int portstatus)
 159{
 
 
 160	if (hub_is_superspeed(hub->hdev))
 161		return "5.0 Gb/s";
 162	if (portstatus & USB_PORT_STAT_HIGH_SPEED)
 163    		return "480 Mb/s";
 164	else if (portstatus & USB_PORT_STAT_LOW_SPEED)
 165		return "1.5 Mb/s";
 166	else
 167		return "12 Mb/s";
 168}
 169
 170/* Note that hdev or one of its children must be locked! */
 171static struct usb_hub *hdev_to_hub(struct usb_device *hdev)
 172{
 173	if (!hdev || !hdev->actconfig)
 174		return NULL;
 175	return usb_get_intfdata(hdev->actconfig->interface[0]);
 176}
 177
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 178/* USB 2.0 spec Section 11.24.4.5 */
 179static int get_hub_descriptor(struct usb_device *hdev, void *data)
 
 180{
 181	int i, ret, size;
 182	unsigned dtype;
 183
 184	if (hub_is_superspeed(hdev)) {
 185		dtype = USB_DT_SS_HUB;
 186		size = USB_DT_SS_HUB_SIZE;
 187	} else {
 188		dtype = USB_DT_HUB;
 189		size = sizeof(struct usb_hub_descriptor);
 190	}
 191
 192	for (i = 0; i < 3; i++) {
 193		ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
 194			USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
 195			dtype << 8, 0, data, size,
 196			USB_CTRL_GET_TIMEOUT);
 197		if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
 
 
 
 
 
 
 
 198			return ret;
 
 199	}
 200	return -EINVAL;
 201}
 202
 203/*
 204 * USB 2.0 spec Section 11.24.2.1
 205 */
 206static int clear_hub_feature(struct usb_device *hdev, int feature)
 207{
 208	return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
 209		USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
 210}
 211
 212/*
 213 * USB 2.0 spec Section 11.24.2.2
 214 */
 215static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
 216{
 217	return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
 218		USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
 219		NULL, 0, 1000);
 220}
 221
 222/*
 223 * USB 2.0 spec Section 11.24.2.13
 224 */
 225static int set_port_feature(struct usb_device *hdev, int port1, int feature)
 226{
 227	return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
 228		USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
 229		NULL, 0, 1000);
 230}
 231
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 232/*
 233 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
 234 * for info about using port indicators
 235 */
 236static void set_port_led(
 237	struct usb_hub *hub,
 238	int port1,
 239	int selector
 240)
 241{
 242	int status = set_port_feature(hub->hdev, (selector << 8) | port1,
 
 
 
 243			USB_PORT_FEAT_INDICATOR);
 244	if (status < 0)
 245		dev_dbg (hub->intfdev,
 246			"port %d indicator %s status %d\n",
 247			port1,
 248			({ char *s; switch (selector) {
 249			case HUB_LED_AMBER: s = "amber"; break;
 250			case HUB_LED_GREEN: s = "green"; break;
 251			case HUB_LED_OFF: s = "off"; break;
 252			case HUB_LED_AUTO: s = "auto"; break;
 253			default: s = "??"; break;
 254			}; s; }),
 255			status);
 256}
 257
 258#define	LED_CYCLE_PERIOD	((2*HZ)/3)
 259
 260static void led_work (struct work_struct *work)
 261{
 262	struct usb_hub		*hub =
 263		container_of(work, struct usb_hub, leds.work);
 264	struct usb_device	*hdev = hub->hdev;
 265	unsigned		i;
 266	unsigned		changed = 0;
 267	int			cursor = -1;
 268
 269	if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
 270		return;
 271
 272	for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
 273		unsigned	selector, mode;
 274
 275		/* 30%-50% duty cycle */
 276
 277		switch (hub->indicator[i]) {
 278		/* cycle marker */
 279		case INDICATOR_CYCLE:
 280			cursor = i;
 281			selector = HUB_LED_AUTO;
 282			mode = INDICATOR_AUTO;
 283			break;
 284		/* blinking green = sw attention */
 285		case INDICATOR_GREEN_BLINK:
 286			selector = HUB_LED_GREEN;
 287			mode = INDICATOR_GREEN_BLINK_OFF;
 288			break;
 289		case INDICATOR_GREEN_BLINK_OFF:
 290			selector = HUB_LED_OFF;
 291			mode = INDICATOR_GREEN_BLINK;
 292			break;
 293		/* blinking amber = hw attention */
 294		case INDICATOR_AMBER_BLINK:
 295			selector = HUB_LED_AMBER;
 296			mode = INDICATOR_AMBER_BLINK_OFF;
 297			break;
 298		case INDICATOR_AMBER_BLINK_OFF:
 299			selector = HUB_LED_OFF;
 300			mode = INDICATOR_AMBER_BLINK;
 301			break;
 302		/* blink green/amber = reserved */
 303		case INDICATOR_ALT_BLINK:
 304			selector = HUB_LED_GREEN;
 305			mode = INDICATOR_ALT_BLINK_OFF;
 306			break;
 307		case INDICATOR_ALT_BLINK_OFF:
 308			selector = HUB_LED_AMBER;
 309			mode = INDICATOR_ALT_BLINK;
 310			break;
 311		default:
 312			continue;
 313		}
 314		if (selector != HUB_LED_AUTO)
 315			changed = 1;
 316		set_port_led(hub, i + 1, selector);
 317		hub->indicator[i] = mode;
 318	}
 319	if (!changed && blinkenlights) {
 320		cursor++;
 321		cursor %= hub->descriptor->bNbrPorts;
 322		set_port_led(hub, cursor + 1, HUB_LED_GREEN);
 323		hub->indicator[cursor] = INDICATOR_CYCLE;
 324		changed++;
 325	}
 326	if (changed)
 327		schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
 
 328}
 329
 330/* use a short timeout for hub/port status fetches */
 331#define	USB_STS_TIMEOUT		1000
 332#define	USB_STS_RETRIES		5
 333
 334/*
 335 * USB 2.0 spec Section 11.24.2.6
 336 */
 337static int get_hub_status(struct usb_device *hdev,
 338		struct usb_hub_status *data)
 339{
 340	int i, status = -ETIMEDOUT;
 341
 342	for (i = 0; i < USB_STS_RETRIES &&
 343			(status == -ETIMEDOUT || status == -EPIPE); i++) {
 344		status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
 345			USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
 346			data, sizeof(*data), USB_STS_TIMEOUT);
 347	}
 348	return status;
 349}
 350
 351/*
 352 * USB 2.0 spec Section 11.24.2.7
 
 353 */
 354static int get_port_status(struct usb_device *hdev, int port1,
 355		struct usb_port_status *data)
 356{
 357	int i, status = -ETIMEDOUT;
 358
 359	for (i = 0; i < USB_STS_RETRIES &&
 360			(status == -ETIMEDOUT || status == -EPIPE); i++) {
 361		status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
 362			USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
 363			data, sizeof(*data), USB_STS_TIMEOUT);
 364	}
 365	return status;
 366}
 367
 368static int hub_port_status(struct usb_hub *hub, int port1,
 369		u16 *status, u16 *change)
 370{
 371	int ret;
 
 
 
 
 372
 373	mutex_lock(&hub->status_mutex);
 374	ret = get_port_status(hub->hdev, port1, &hub->status->port);
 375	if (ret < 4) {
 376		dev_err(hub->intfdev,
 377			"%s failed (err = %d)\n", __func__, ret);
 
 378		if (ret >= 0)
 379			ret = -EIO;
 380	} else {
 381		*status = le16_to_cpu(hub->status->port.wPortStatus);
 382		*change = le16_to_cpu(hub->status->port.wPortChange);
 383
 
 
 384		ret = 0;
 385	}
 386	mutex_unlock(&hub->status_mutex);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 387	return ret;
 388}
 389
 390static void kick_khubd(struct usb_hub *hub)
 
 391{
 392	unsigned long	flags;
 
 
 393
 394	spin_lock_irqsave(&hub_event_lock, flags);
 395	if (!hub->disconnected && list_empty(&hub->event_list)) {
 396		list_add_tail(&hub->event_list, &hub_event_list);
 
 
 
 397
 398		/* Suppress autosuspend until khubd runs */
 399		usb_autopm_get_interface_no_resume(
 400				to_usb_interface(hub->intfdev));
 401		wake_up(&khubd_wait);
 402	}
 403	spin_unlock_irqrestore(&hub_event_lock, flags);
 
 
 
 
 
 
 
 
 404}
 405
 406void usb_kick_khubd(struct usb_device *hdev)
 407{
 408	struct usb_hub *hub = hdev_to_hub(hdev);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 409
 410	if (hub)
 411		kick_khubd(hub);
 412}
 413
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 414
 415/* completion function, fires on port status changes and various faults */
 416static void hub_irq(struct urb *urb)
 417{
 418	struct usb_hub *hub = urb->context;
 419	int status = urb->status;
 420	unsigned i;
 421	unsigned long bits;
 422
 423	switch (status) {
 424	case -ENOENT:		/* synchronous unlink */
 425	case -ECONNRESET:	/* async unlink */
 426	case -ESHUTDOWN:	/* hardware going away */
 427		return;
 428
 429	default:		/* presumably an error */
 430		/* Cause a hub reset after 10 consecutive errors */
 431		dev_dbg (hub->intfdev, "transfer --> %d\n", status);
 432		if ((++hub->nerrors < 10) || hub->error)
 433			goto resubmit;
 434		hub->error = status;
 435		/* FALL THROUGH */
 436
 437	/* let khubd handle things */
 438	case 0:			/* we got data:  port status changed */
 439		bits = 0;
 440		for (i = 0; i < urb->actual_length; ++i)
 441			bits |= ((unsigned long) ((*hub->buffer)[i]))
 442					<< (i*8);
 443		hub->event_bits[0] = bits;
 444		break;
 445	}
 446
 447	hub->nerrors = 0;
 448
 449	/* Something happened, let khubd figure it out */
 450	kick_khubd(hub);
 451
 452resubmit:
 453	if (hub->quiescing)
 454		return;
 455
 456	if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
 457			&& status != -ENODEV && status != -EPERM)
 458		dev_err (hub->intfdev, "resubmit --> %d\n", status);
 459}
 460
 461/* USB 2.0 spec Section 11.24.2.3 */
 462static inline int
 463hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
 464{
 
 
 
 
 
 
 
 
 
 465	return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
 466			       HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
 467			       tt, NULL, 0, 1000);
 468}
 469
 470/*
 471 * enumeration blocks khubd for a long time. we use keventd instead, since
 472 * long blocking there is the exception, not the rule.  accordingly, HCDs
 473 * talking to TTs must queue control transfers (not just bulk and iso), so
 474 * both can talk to the same hub concurrently.
 475 */
 476static void hub_tt_work(struct work_struct *work)
 477{
 478	struct usb_hub		*hub =
 479		container_of(work, struct usb_hub, tt.clear_work);
 480	unsigned long		flags;
 481	int			limit = 100;
 482
 483	spin_lock_irqsave (&hub->tt.lock, flags);
 484	while (--limit && !list_empty (&hub->tt.clear_list)) {
 485		struct list_head	*next;
 486		struct usb_tt_clear	*clear;
 487		struct usb_device	*hdev = hub->hdev;
 488		const struct hc_driver	*drv;
 489		int			status;
 490
 491		next = hub->tt.clear_list.next;
 492		clear = list_entry (next, struct usb_tt_clear, clear_list);
 493		list_del (&clear->clear_list);
 494
 495		/* drop lock so HCD can concurrently report other TT errors */
 496		spin_unlock_irqrestore (&hub->tt.lock, flags);
 497		status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
 498		if (status)
 499			dev_err (&hdev->dev,
 500				"clear tt %d (%04x) error %d\n",
 501				clear->tt, clear->devinfo, status);
 502
 503		/* Tell the HCD, even if the operation failed */
 504		drv = clear->hcd->driver;
 505		if (drv->clear_tt_buffer_complete)
 506			(drv->clear_tt_buffer_complete)(clear->hcd, clear->ep);
 507
 508		kfree(clear);
 509		spin_lock_irqsave(&hub->tt.lock, flags);
 510	}
 511	spin_unlock_irqrestore (&hub->tt.lock, flags);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 512}
 513
 514/**
 515 * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
 516 * @urb: an URB associated with the failed or incomplete split transaction
 517 *
 518 * High speed HCDs use this to tell the hub driver that some split control or
 519 * bulk transaction failed in a way that requires clearing internal state of
 520 * a transaction translator.  This is normally detected (and reported) from
 521 * interrupt context.
 522 *
 523 * It may not be possible for that hub to handle additional full (or low)
 524 * speed transactions until that state is fully cleared out.
 
 
 525 */
 526int usb_hub_clear_tt_buffer(struct urb *urb)
 527{
 528	struct usb_device	*udev = urb->dev;
 529	int			pipe = urb->pipe;
 530	struct usb_tt		*tt = udev->tt;
 531	unsigned long		flags;
 532	struct usb_tt_clear	*clear;
 533
 534	/* we've got to cope with an arbitrary number of pending TT clears,
 535	 * since each TT has "at least two" buffers that can need it (and
 536	 * there can be many TTs per hub).  even if they're uncommon.
 537	 */
 538	if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
 539		dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
 
 540		/* FIXME recover somehow ... RESET_TT? */
 541		return -ENOMEM;
 542	}
 543
 544	/* info that CLEAR_TT_BUFFER needs */
 545	clear->tt = tt->multi ? udev->ttport : 1;
 546	clear->devinfo = usb_pipeendpoint (pipe);
 547	clear->devinfo |= udev->devnum << 4;
 548	clear->devinfo |= usb_pipecontrol (pipe)
 549			? (USB_ENDPOINT_XFER_CONTROL << 11)
 550			: (USB_ENDPOINT_XFER_BULK << 11);
 551	if (usb_pipein (pipe))
 552		clear->devinfo |= 1 << 15;
 553
 554	/* info for completion callback */
 555	clear->hcd = bus_to_hcd(udev->bus);
 556	clear->ep = urb->ep;
 557
 558	/* tell keventd to clear state for this TT */
 559	spin_lock_irqsave (&tt->lock, flags);
 560	list_add_tail (&clear->clear_list, &tt->clear_list);
 561	schedule_work(&tt->clear_work);
 562	spin_unlock_irqrestore (&tt->lock, flags);
 563	return 0;
 564}
 565EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer);
 566
 567/* If do_delay is false, return the number of milliseconds the caller
 568 * needs to delay.
 569 */
 570static unsigned hub_power_on(struct usb_hub *hub, bool do_delay)
 571{
 572	int port1;
 573	unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
 574	unsigned delay;
 575	u16 wHubCharacteristics =
 576			le16_to_cpu(hub->descriptor->wHubCharacteristics);
 577
 578	/* Enable power on each port.  Some hubs have reserved values
 579	 * of LPSM (> 2) in their descriptors, even though they are
 580	 * USB 2.0 hubs.  Some hubs do not implement port-power switching
 581	 * but only emulate it.  In all cases, the ports won't work
 582	 * unless we send these messages to the hub.
 583	 */
 584	if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
 585		dev_dbg(hub->intfdev, "enabling power on all ports\n");
 586	else
 587		dev_dbg(hub->intfdev, "trying to enable port power on "
 588				"non-switchable hub\n");
 589	for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
 590		set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
 591
 592	/* Wait at least 100 msec for power to become stable */
 593	delay = max(pgood_delay, (unsigned) 100);
 
 594	if (do_delay)
 595		msleep(delay);
 596	return delay;
 597}
 598
 599static int hub_hub_status(struct usb_hub *hub,
 600		u16 *status, u16 *change)
 601{
 602	int ret;
 603
 604	mutex_lock(&hub->status_mutex);
 605	ret = get_hub_status(hub->hdev, &hub->status->hub);
 606	if (ret < 0)
 607		dev_err (hub->intfdev,
 608			"%s failed (err = %d)\n", __func__, ret);
 609	else {
 
 610		*status = le16_to_cpu(hub->status->hub.wHubStatus);
 611		*change = le16_to_cpu(hub->status->hub.wHubChange); 
 612		ret = 0;
 613	}
 614	mutex_unlock(&hub->status_mutex);
 615	return ret;
 616}
 617
 618static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
 
 619{
 620	struct usb_device *hdev = hub->hdev;
 621	int ret = 0;
 622
 623	if (hdev->children[port1-1] && set_state)
 624		usb_set_device_state(hdev->children[port1-1],
 625				USB_STATE_NOTATTACHED);
 626	if (!hub->error && !hub_is_superspeed(hub->hdev))
 627		ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
 628	if (ret)
 629		dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
 630				port1, ret);
 631	return ret;
 632}
 633
 634/*
 635 * Disable a port and mark a logical connect-change event, so that some
 636 * time later khubd will disconnect() any existing usb_device on the port
 637 * and will re-enumerate if there actually is a device attached.
 638 */
 639static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
 640{
 641	dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
 642	hub_port_disable(hub, port1, 1);
 643
 644	/* FIXME let caller ask to power down the port:
 645	 *  - some devices won't enumerate without a VBUS power cycle
 646	 *  - SRP saves power that way
 647	 *  - ... new call, TBD ...
 648	 * That's easy if this hub can switch power per-port, and
 649	 * khubd reactivates the port later (timer, SRP, etc).
 650	 * Powerdown must be optional, because of reset/DFU.
 651	 */
 652
 653	set_bit(port1, hub->change_bits);
 654 	kick_khubd(hub);
 655}
 656
 657/**
 658 * usb_remove_device - disable a device's port on its parent hub
 659 * @udev: device to be disabled and removed
 660 * Context: @udev locked, must be able to sleep.
 661 *
 662 * After @udev's port has been disabled, khubd is notified and it will
 663 * see that the device has been disconnected.  When the device is
 664 * physically unplugged and something is plugged in, the events will
 665 * be received and processed normally.
 
 
 666 */
 667int usb_remove_device(struct usb_device *udev)
 668{
 669	struct usb_hub *hub;
 670	struct usb_interface *intf;
 
 671
 672	if (!udev->parent)	/* Can't remove a root hub */
 673		return -EINVAL;
 674	hub = hdev_to_hub(udev->parent);
 675	intf = to_usb_interface(hub->intfdev);
 676
 677	usb_autopm_get_interface(intf);
 
 
 
 678	set_bit(udev->portnum, hub->removed_bits);
 679	hub_port_logical_disconnect(hub, udev->portnum);
 680	usb_autopm_put_interface(intf);
 681	return 0;
 682}
 683
 684enum hub_activation_type {
 685	HUB_INIT, HUB_INIT2, HUB_INIT3,		/* INITs must come first */
 686	HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME,
 687};
 688
 689static void hub_init_func2(struct work_struct *ws);
 690static void hub_init_func3(struct work_struct *ws);
 691
 692static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
 693{
 694	struct usb_device *hdev = hub->hdev;
 695	struct usb_hcd *hcd;
 696	int ret;
 697	int port1;
 698	int status;
 699	bool need_debounce_delay = false;
 700	unsigned delay;
 701
 702	/* Continue a partial initialization */
 703	if (type == HUB_INIT2)
 704		goto init2;
 705	if (type == HUB_INIT3)
 
 
 
 
 
 706		goto init3;
 
 
 707
 708	/* After a resume, port power should still be on.
 
 
 
 
 
 
 
 709	 * For any other type of activation, turn it on.
 710	 */
 711	if (type != HUB_RESUME) {
 
 
 
 
 
 
 
 
 
 712
 713		/* Speed up system boot by using a delayed_work for the
 714		 * hub's initial power-up delays.  This is pretty awkward
 715		 * and the implementation looks like a home-brewed sort of
 716		 * setjmp/longjmp, but it saves at least 100 ms for each
 717		 * root hub (assuming usbcore is compiled into the kernel
 718		 * rather than as a module).  It adds up.
 719		 *
 720		 * This can't be done for HUB_RESUME or HUB_RESET_RESUME
 721		 * because for those activation types the ports have to be
 722		 * operational when we return.  In theory this could be done
 723		 * for HUB_POST_RESET, but it's easier not to.
 724		 */
 725		if (type == HUB_INIT) {
 726			delay = hub_power_on(hub, false);
 727			PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2);
 728			schedule_delayed_work(&hub->init_work,
 
 
 
 729					msecs_to_jiffies(delay));
 730
 731			/* Suppress autosuspend until init is done */
 732			usb_autopm_get_interface_no_resume(
 733					to_usb_interface(hub->intfdev));
 734			return;		/* Continues at init2: below */
 735		} else if (type == HUB_RESET_RESUME) {
 736			/* The internal host controller state for the hub device
 737			 * may be gone after a host power loss on system resume.
 738			 * Update the device's info so the HW knows it's a hub.
 739			 */
 740			hcd = bus_to_hcd(hdev->bus);
 741			if (hcd->driver->update_hub_device) {
 742				ret = hcd->driver->update_hub_device(hcd, hdev,
 743						&hub->tt, GFP_NOIO);
 744				if (ret < 0) {
 745					dev_err(hub->intfdev, "Host not "
 746							"accepting hub info "
 747							"update.\n");
 748					dev_err(hub->intfdev, "LS/FS devices "
 749							"and hubs may not work "
 750							"under this hub\n.");
 751				}
 752			}
 753			hub_power_on(hub, true);
 754		} else {
 755			hub_power_on(hub, true);
 756		}
 757	}
 
 
 
 758 init2:
 759
 760	/* Check each port and set hub->change_bits to let khubd know
 
 761	 * which ports need attention.
 762	 */
 763	for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
 764		struct usb_device *udev = hdev->children[port1-1];
 
 765		u16 portstatus, portchange;
 766
 767		portstatus = portchange = 0;
 768		status = hub_port_status(hub, port1, &portstatus, &portchange);
 
 
 
 769		if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
 770			dev_dbg(hub->intfdev,
 771					"port %d: status %04x change %04x\n",
 772					port1, portstatus, portchange);
 773
 774		/* After anything other than HUB_RESUME (i.e., initialization
 
 775		 * or any sort of reset), every port should be disabled.
 776		 * Unconnected ports should likewise be disabled (paranoia),
 777		 * and so should ports for which we have no usb_device.
 778		 */
 779		if ((portstatus & USB_PORT_STAT_ENABLE) && (
 780				type != HUB_RESUME ||
 781				!(portstatus & USB_PORT_STAT_CONNECTION) ||
 782				!udev ||
 783				udev->state == USB_STATE_NOTATTACHED)) {
 784			/*
 785			 * USB3 protocol ports will automatically transition
 786			 * to Enabled state when detect an USB3.0 device attach.
 787			 * Do not disable USB3 protocol ports.
 
 788			 */
 789			if (!hub_is_superspeed(hdev)) {
 790				clear_port_feature(hdev, port1,
 
 791						   USB_PORT_FEAT_ENABLE);
 792				portstatus &= ~USB_PORT_STAT_ENABLE;
 793			} else {
 794				/* Pretend that power was lost for USB3 devs */
 795				portstatus &= ~USB_PORT_STAT_ENABLE;
 796			}
 797		}
 798
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 799		/* Clear status-change flags; we'll debounce later */
 800		if (portchange & USB_PORT_STAT_C_CONNECTION) {
 801			need_debounce_delay = true;
 802			clear_port_feature(hub->hdev, port1,
 803					USB_PORT_FEAT_C_CONNECTION);
 804		}
 805		if (portchange & USB_PORT_STAT_C_ENABLE) {
 806			need_debounce_delay = true;
 807			clear_port_feature(hub->hdev, port1,
 808					USB_PORT_FEAT_C_ENABLE);
 809		}
 810		if (portchange & USB_PORT_STAT_C_LINK_STATE) {
 811			need_debounce_delay = true;
 812			clear_port_feature(hub->hdev, port1,
 813					USB_PORT_FEAT_C_PORT_LINK_STATE);
 
 
 
 
 
 
 814		}
 815
 816		/* We can forget about a "removed" device when there's a
 817		 * physical disconnect or the connect status changes.
 818		 */
 819		if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
 820				(portchange & USB_PORT_STAT_C_CONNECTION))
 821			clear_bit(port1, hub->removed_bits);
 822
 823		if (!udev || udev->state == USB_STATE_NOTATTACHED) {
 824			/* Tell khubd to disconnect the device or
 825			 * check for a new connection
 
 
 
 826			 */
 827			if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
 
 
 
 828				set_bit(port1, hub->change_bits);
 829
 830		} else if (portstatus & USB_PORT_STAT_ENABLE) {
 
 
 
 831			/* The power session apparently survived the resume.
 832			 * If there was an overcurrent or suspend change
 833			 * (i.e., remote wakeup request), have khubd
 834			 * take care of it.
 
 
 
 835			 */
 836			if (portchange)
 837				set_bit(port1, hub->change_bits);
 
 838
 839		} else if (udev->persist_enabled) {
 840#ifdef CONFIG_PM
 841			udev->reset_resume = 1;
 842#endif
 843			set_bit(port1, hub->change_bits);
 
 
 
 
 844
 845		} else {
 846			/* The power session is gone; tell khubd */
 847			usb_set_device_state(udev, USB_STATE_NOTATTACHED);
 848			set_bit(port1, hub->change_bits);
 849		}
 850	}
 851
 852	/* If no port-status-change flags were set, we don't need any
 853	 * debouncing.  If flags were set we can try to debounce the
 854	 * ports all at once right now, instead of letting khubd do them
 855	 * one at a time later on.
 856	 *
 857	 * If any port-status changes do occur during this delay, khubd
 858	 * will see them later and handle them normally.
 859	 */
 860	if (need_debounce_delay) {
 861		delay = HUB_DEBOUNCE_STABLE;
 862
 863		/* Don't do a long sleep inside a workqueue routine */
 864		if (type == HUB_INIT2) {
 865			PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3);
 866			schedule_delayed_work(&hub->init_work,
 
 867					msecs_to_jiffies(delay));
 
 868			return;		/* Continues at init3: below */
 869		} else {
 870			msleep(delay);
 871		}
 872	}
 873 init3:
 874	hub->quiescing = 0;
 875
 876	status = usb_submit_urb(hub->urb, GFP_NOIO);
 877	if (status < 0)
 878		dev_err(hub->intfdev, "activate --> %d\n", status);
 879	if (hub->has_indicators && blinkenlights)
 880		schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
 
 881
 882	/* Scan all ports that need attention */
 883	kick_khubd(hub);
 884
 885	/* Allow autosuspend if it was suppressed */
 886	if (type <= HUB_INIT3)
 
 887		usb_autopm_put_interface_async(to_usb_interface(hub->intfdev));
 
 
 
 
 888}
 889
 890/* Implement the continuations for the delays above */
 891static void hub_init_func2(struct work_struct *ws)
 892{
 893	struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
 894
 895	hub_activate(hub, HUB_INIT2);
 896}
 897
 898static void hub_init_func3(struct work_struct *ws)
 899{
 900	struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
 901
 902	hub_activate(hub, HUB_INIT3);
 903}
 904
 905enum hub_quiescing_type {
 906	HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND
 907};
 908
 909static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
 910{
 911	struct usb_device *hdev = hub->hdev;
 
 912	int i;
 913
 914	cancel_delayed_work_sync(&hub->init_work);
 915
 916	/* khubd and related activity won't re-trigger */
 917	hub->quiescing = 1;
 
 918
 919	if (type != HUB_SUSPEND) {
 920		/* Disconnect all the children */
 921		for (i = 0; i < hdev->maxchild; ++i) {
 922			if (hdev->children[i])
 923				usb_disconnect(&hdev->children[i]);
 924		}
 925	}
 926
 927	/* Stop khubd and related activity */
 
 928	usb_kill_urb(hub->urb);
 929	if (hub->has_indicators)
 930		cancel_delayed_work_sync(&hub->leds);
 931	if (hub->tt.hub)
 932		cancel_work_sync(&hub->tt.clear_work);
 
 
 
 
 
 
 
 
 933}
 934
 935/* caller has locked the hub device */
 936static int hub_pre_reset(struct usb_interface *intf)
 937{
 938	struct usb_hub *hub = usb_get_intfdata(intf);
 939
 940	hub_quiesce(hub, HUB_PRE_RESET);
 
 
 941	return 0;
 942}
 943
 944/* caller has locked the hub device */
 945static int hub_post_reset(struct usb_interface *intf)
 946{
 947	struct usb_hub *hub = usb_get_intfdata(intf);
 948
 
 
 949	hub_activate(hub, HUB_POST_RESET);
 950	return 0;
 951}
 952
 953static int hub_configure(struct usb_hub *hub,
 954	struct usb_endpoint_descriptor *endpoint)
 955{
 956	struct usb_hcd *hcd;
 957	struct usb_device *hdev = hub->hdev;
 958	struct device *hub_dev = hub->intfdev;
 959	u16 hubstatus, hubchange;
 960	u16 wHubCharacteristics;
 961	unsigned int pipe;
 962	int maxp, ret;
 963	char *message = "out of memory";
 
 
 
 964
 965	hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL);
 966	if (!hub->buffer) {
 967		ret = -ENOMEM;
 968		goto fail;
 969	}
 970
 971	hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
 972	if (!hub->status) {
 973		ret = -ENOMEM;
 974		goto fail;
 975	}
 976	mutex_init(&hub->status_mutex);
 977
 978	hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
 979	if (!hub->descriptor) {
 980		ret = -ENOMEM;
 981		goto fail;
 982	}
 983
 984	if (hub_is_superspeed(hdev) && (hdev->parent != NULL)) {
 985		ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
 986				HUB_SET_DEPTH, USB_RT_HUB,
 987				hdev->level - 1, 0, NULL, 0,
 988				USB_CTRL_SET_TIMEOUT);
 989
 990		if (ret < 0) {
 991			message = "can't set hub depth";
 992			goto fail;
 993		}
 994	}
 995
 996	/* Request the entire hub descriptor.
 997	 * hub->descriptor can handle USB_MAXCHILDREN ports,
 998	 * but the hub can/will return fewer bytes here.
 999	 */
1000	ret = get_hub_descriptor(hdev, hub->descriptor);
1001	if (ret < 0) {
1002		message = "can't read hub descriptor";
1003		goto fail;
1004	} else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
 
 
 
 
 
 
1005		message = "hub has too many ports!";
1006		ret = -ENODEV;
1007		goto fail;
 
 
 
 
1008	}
1009
1010	hdev->maxchild = hub->descriptor->bNbrPorts;
1011	dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
1012		(hdev->maxchild == 1) ? "" : "s");
 
 
 
 
 
 
 
 
 
 
1013
1014	hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL);
1015	if (!hub->port_owners) {
 
 
 
 
1016		ret = -ENOMEM;
1017		goto fail;
1018	}
1019
1020	wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
 
 
 
 
 
 
 
1021
1022	/* FIXME for USB 3.0, skip for now */
1023	if ((wHubCharacteristics & HUB_CHAR_COMPOUND) &&
1024			!(hub_is_superspeed(hdev))) {
1025		int	i;
1026		char	portstr [USB_MAXCHILDREN + 1];
1027
1028		for (i = 0; i < hdev->maxchild; i++)
1029			portstr[i] = hub->descriptor->u.hs.DeviceRemovable
1030				    [((i + 1) / 8)] & (1 << ((i + 1) % 8))
1031				? 'F' : 'R';
1032		portstr[hdev->maxchild] = 0;
1033		dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
1034	} else
1035		dev_dbg(hub_dev, "standalone hub\n");
1036
1037	switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1038		case 0x00:
1039			dev_dbg(hub_dev, "ganged power switching\n");
1040			break;
1041		case 0x01:
1042			dev_dbg(hub_dev, "individual port power switching\n");
1043			break;
1044		case 0x02:
1045		case 0x03:
1046			dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
1047			break;
1048	}
1049
1050	switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1051		case 0x00:
1052			dev_dbg(hub_dev, "global over-current protection\n");
1053			break;
1054		case 0x08:
1055			dev_dbg(hub_dev, "individual port over-current protection\n");
1056			break;
1057		case 0x10:
1058		case 0x18:
1059			dev_dbg(hub_dev, "no over-current protection\n");
1060                        break;
1061	}
1062
1063	spin_lock_init (&hub->tt.lock);
1064	INIT_LIST_HEAD (&hub->tt.clear_list);
1065	INIT_WORK(&hub->tt.clear_work, hub_tt_work);
1066	switch (hdev->descriptor.bDeviceProtocol) {
1067		case 0:
1068			break;
1069		case 1:
1070			dev_dbg(hub_dev, "Single TT\n");
1071			hub->tt.hub = hdev;
1072			break;
1073		case 2:
1074			ret = usb_set_interface(hdev, 0, 1);
1075			if (ret == 0) {
1076				dev_dbg(hub_dev, "TT per port\n");
1077				hub->tt.multi = 1;
1078			} else
1079				dev_err(hub_dev, "Using single TT (err %d)\n",
1080					ret);
1081			hub->tt.hub = hdev;
1082			break;
1083		case 3:
1084			/* USB 3.0 hubs don't have a TT */
1085			break;
1086		default:
1087			dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
1088				hdev->descriptor.bDeviceProtocol);
1089			break;
1090	}
1091
1092	/* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
1093	switch (wHubCharacteristics & HUB_CHAR_TTTT) {
1094		case HUB_TTTT_8_BITS:
1095			if (hdev->descriptor.bDeviceProtocol != 0) {
1096				hub->tt.think_time = 666;
1097				dev_dbg(hub_dev, "TT requires at most %d "
1098						"FS bit times (%d ns)\n",
1099					8, hub->tt.think_time);
1100			}
1101			break;
1102		case HUB_TTTT_16_BITS:
1103			hub->tt.think_time = 666 * 2;
1104			dev_dbg(hub_dev, "TT requires at most %d "
1105					"FS bit times (%d ns)\n",
1106				16, hub->tt.think_time);
1107			break;
1108		case HUB_TTTT_24_BITS:
1109			hub->tt.think_time = 666 * 3;
1110			dev_dbg(hub_dev, "TT requires at most %d "
1111					"FS bit times (%d ns)\n",
1112				24, hub->tt.think_time);
1113			break;
1114		case HUB_TTTT_32_BITS:
1115			hub->tt.think_time = 666 * 4;
1116			dev_dbg(hub_dev, "TT requires at most %d "
1117					"FS bit times (%d ns)\n",
1118				32, hub->tt.think_time);
1119			break;
 
 
 
 
 
 
 
 
 
 
 
 
 
1120	}
1121
1122	/* probe() zeroes hub->indicator[] */
1123	if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1124		hub->has_indicators = 1;
1125		dev_dbg(hub_dev, "Port indicators are supported\n");
1126	}
1127
1128	dev_dbg(hub_dev, "power on to power good time: %dms\n",
1129		hub->descriptor->bPwrOn2PwrGood * 2);
1130
1131	/* power budgeting mostly matters with bus-powered hubs,
1132	 * and battery-powered root hubs (may provide just 8 mA).
1133	 */
1134	ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
1135	if (ret < 2) {
1136		message = "can't get hub status";
1137		goto fail;
1138	}
1139	le16_to_cpus(&hubstatus);
1140	if (hdev == hdev->bus->root_hub) {
1141		if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
1142			hub->mA_per_port = 500;
 
 
 
 
1143		else {
1144			hub->mA_per_port = hdev->bus_mA;
1145			hub->limited_power = 1;
1146		}
1147	} else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
 
 
 
1148		dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
1149			hub->descriptor->bHubContrCurrent);
1150		hub->limited_power = 1;
1151		if (hdev->maxchild > 0) {
1152			int remaining = hdev->bus_mA -
1153					hub->descriptor->bHubContrCurrent;
1154
1155			if (remaining < hdev->maxchild * 100)
1156				dev_warn(hub_dev,
1157					"insufficient power available "
1158					"to use all downstream ports\n");
1159			hub->mA_per_port = 100;		/* 7.2.1.1 */
1160		}
1161	} else {	/* Self-powered external hub */
1162		/* FIXME: What about battery-powered external hubs that
1163		 * provide less current per port? */
1164		hub->mA_per_port = 500;
1165	}
1166	if (hub->mA_per_port < 500)
1167		dev_dbg(hub_dev, "%umA bus power budget for each child\n",
1168				hub->mA_per_port);
1169
1170	/* Update the HCD's internal representation of this hub before khubd
1171	 * starts getting port status changes for devices under the hub.
1172	 */
1173	hcd = bus_to_hcd(hdev->bus);
1174	if (hcd->driver->update_hub_device) {
1175		ret = hcd->driver->update_hub_device(hcd, hdev,
1176				&hub->tt, GFP_KERNEL);
1177		if (ret < 0) {
1178			message = "can't update HCD hub info";
1179			goto fail;
1180		}
1181	}
1182
1183	ret = hub_hub_status(hub, &hubstatus, &hubchange);
1184	if (ret < 0) {
1185		message = "can't get hub status";
1186		goto fail;
1187	}
1188
1189	/* local power status reports aren't always correct */
1190	if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
1191		dev_dbg(hub_dev, "local power source is %s\n",
1192			(hubstatus & HUB_STATUS_LOCAL_POWER)
1193			? "lost (inactive)" : "good");
1194
1195	if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1196		dev_dbg(hub_dev, "%sover-current condition exists\n",
1197			(hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
1198
1199	/* set up the interrupt endpoint
1200	 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
1201	 * bytes as USB2.0[11.12.3] says because some hubs are known
1202	 * to send more data (and thus cause overflow). For root hubs,
1203	 * maxpktsize is defined in hcd.c's fake endpoint descriptors
1204	 * to be big enough for at least USB_MAXCHILDREN ports. */
1205	pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
1206	maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
1207
1208	if (maxp > sizeof(*hub->buffer))
1209		maxp = sizeof(*hub->buffer);
1210
1211	hub->urb = usb_alloc_urb(0, GFP_KERNEL);
1212	if (!hub->urb) {
1213		ret = -ENOMEM;
1214		goto fail;
1215	}
1216
1217	usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
1218		hub, endpoint->bInterval);
1219
1220	/* maybe cycle the hub leds */
1221	if (hub->has_indicators && blinkenlights)
1222		hub->indicator [0] = INDICATOR_CYCLE;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1223
1224	hub_activate(hub, HUB_INIT);
1225	return 0;
1226
1227fail:
1228	dev_err (hub_dev, "config failed, %s (err %d)\n",
1229			message, ret);
1230	/* hub_disconnect() frees urb and descriptor */
1231	return ret;
1232}
1233
1234static void hub_release(struct kref *kref)
1235{
1236	struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
1237
 
1238	usb_put_intf(to_usb_interface(hub->intfdev));
1239	kfree(hub);
1240}
1241
 
 
 
 
 
 
 
 
 
 
1242static unsigned highspeed_hubs;
1243
1244static void hub_disconnect(struct usb_interface *intf)
1245{
1246	struct usb_hub *hub = usb_get_intfdata (intf);
 
 
1247
1248	/* Take the hub off the event list and don't let it be added again */
1249	spin_lock_irq(&hub_event_lock);
1250	if (!list_empty(&hub->event_list)) {
1251		list_del_init(&hub->event_list);
1252		usb_autopm_put_interface_no_suspend(intf);
1253	}
1254	hub->disconnected = 1;
1255	spin_unlock_irq(&hub_event_lock);
1256
1257	/* Disconnect all children and quiesce the hub */
1258	hub->error = 0;
1259	hub_quiesce(hub, HUB_DISCONNECT);
1260
1261	usb_set_intfdata (intf, NULL);
1262	hub->hdev->maxchild = 0;
 
 
 
 
 
 
 
 
 
 
 
1263
1264	if (hub->hdev->speed == USB_SPEED_HIGH)
1265		highspeed_hubs--;
1266
1267	usb_free_urb(hub->urb);
1268	kfree(hub->port_owners);
1269	kfree(hub->descriptor);
1270	kfree(hub->status);
1271	kfree(hub->buffer);
1272
1273	kref_put(&hub->kref, hub_release);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1274}
1275
1276static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
1277{
1278	struct usb_host_interface *desc;
1279	struct usb_endpoint_descriptor *endpoint;
1280	struct usb_device *hdev;
1281	struct usb_hub *hub;
1282
1283	desc = intf->cur_altsetting;
1284	hdev = interface_to_usbdev(intf);
1285
1286	/* Hubs have proper suspend/resume support.  USB 3.0 device suspend is
1287	 * different from USB 2.0/1.1 device suspend, and unfortunately we
1288	 * don't support it yet.  So leave autosuspend disabled for USB 3.0
1289	 * external hubs for now.  Enable autosuspend for USB 3.0 roothubs,
1290	 * since that isn't a "real" hub.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1291	 */
1292	if (!hub_is_superspeed(hdev) || !hdev->parent)
1293		usb_enable_autosuspend(hdev);
 
 
 
 
 
 
1294
1295	if (hdev->level == MAX_TOPO_LEVEL) {
1296		dev_err(&intf->dev,
1297			"Unsupported bus topology: hub nested too deep\n");
1298		return -E2BIG;
1299	}
1300
1301#ifdef	CONFIG_USB_OTG_BLACKLIST_HUB
1302	if (hdev->parent) {
1303		dev_warn(&intf->dev, "ignoring external hub\n");
1304		return -ENODEV;
1305	}
1306#endif
1307
1308	/* Some hubs have a subclass of 1, which AFAICT according to the */
1309	/*  specs is not defined, but it works */
1310	if ((desc->desc.bInterfaceSubClass != 0) &&
1311	    (desc->desc.bInterfaceSubClass != 1)) {
1312descriptor_error:
1313		dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
1314		return -EIO;
1315	}
1316
1317	/* Multiple endpoints? What kind of mutant ninja-hub is this? */
1318	if (desc->desc.bNumEndpoints != 1)
1319		goto descriptor_error;
1320
1321	endpoint = &desc->endpoint[0].desc;
1322
1323	/* If it's not an interrupt in endpoint, we'd better punt! */
1324	if (!usb_endpoint_is_int_in(endpoint))
1325		goto descriptor_error;
1326
1327	/* We found a hub */
1328	dev_info (&intf->dev, "USB hub found\n");
1329
1330	hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1331	if (!hub) {
1332		dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
1333		return -ENOMEM;
1334	}
1335
1336	kref_init(&hub->kref);
1337	INIT_LIST_HEAD(&hub->event_list);
1338	hub->intfdev = &intf->dev;
1339	hub->hdev = hdev;
1340	INIT_DELAYED_WORK(&hub->leds, led_work);
1341	INIT_DELAYED_WORK(&hub->init_work, NULL);
 
 
 
 
1342	usb_get_intf(intf);
 
1343
1344	usb_set_intfdata (intf, hub);
1345	intf->needs_remote_wakeup = 1;
 
1346
1347	if (hdev->speed == USB_SPEED_HIGH)
1348		highspeed_hubs++;
1349
1350	if (hub_configure(hub, endpoint) >= 0)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1351		return 0;
 
1352
1353	hub_disconnect (intf);
1354	return -ENODEV;
1355}
1356
1357/* No BKL needed */
1358static int
1359hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
1360{
1361	struct usb_device *hdev = interface_to_usbdev (intf);
 
1362
1363	/* assert ifno == 0 (part of hub spec) */
1364	switch (code) {
1365	case USBDEVFS_HUB_PORTINFO: {
1366		struct usbdevfs_hub_portinfo *info = user_data;
1367		int i;
1368
1369		spin_lock_irq(&device_state_lock);
1370		if (hdev->devnum <= 0)
1371			info->nports = 0;
1372		else {
1373			info->nports = hdev->maxchild;
1374			for (i = 0; i < info->nports; i++) {
1375				if (hdev->children[i] == NULL)
1376					info->port[i] = 0;
1377				else
1378					info->port[i] =
1379						hdev->children[i]->devnum;
1380			}
1381		}
1382		spin_unlock_irq(&device_state_lock);
1383
1384		return info->nports + 1;
1385		}
1386
1387	default:
1388		return -ENOSYS;
1389	}
1390}
1391
1392/*
1393 * Allow user programs to claim ports on a hub.  When a device is attached
1394 * to one of these "claimed" ports, the program will "own" the device.
1395 */
1396static int find_port_owner(struct usb_device *hdev, unsigned port1,
1397		void ***ppowner)
1398{
 
 
1399	if (hdev->state == USB_STATE_NOTATTACHED)
1400		return -ENODEV;
1401	if (port1 == 0 || port1 > hdev->maxchild)
1402		return -EINVAL;
1403
1404	/* This assumes that devices not managed by the hub driver
1405	 * will always have maxchild equal to 0.
1406	 */
1407	*ppowner = &(hdev_to_hub(hdev)->port_owners[port1 - 1]);
1408	return 0;
1409}
1410
1411/* In the following three functions, the caller must hold hdev's lock */
1412int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, void *owner)
 
1413{
1414	int rc;
1415	void **powner;
1416
1417	rc = find_port_owner(hdev, port1, &powner);
1418	if (rc)
1419		return rc;
1420	if (*powner)
1421		return -EBUSY;
1422	*powner = owner;
1423	return rc;
1424}
 
1425
1426int usb_hub_release_port(struct usb_device *hdev, unsigned port1, void *owner)
 
1427{
1428	int rc;
1429	void **powner;
1430
1431	rc = find_port_owner(hdev, port1, &powner);
1432	if (rc)
1433		return rc;
1434	if (*powner != owner)
1435		return -ENOENT;
1436	*powner = NULL;
1437	return rc;
1438}
 
1439
1440void usb_hub_release_all_ports(struct usb_device *hdev, void *owner)
1441{
 
1442	int n;
1443	void **powner;
1444
1445	n = find_port_owner(hdev, 1, &powner);
1446	if (n == 0) {
1447		for (; n < hdev->maxchild; (++n, ++powner)) {
1448			if (*powner == owner)
1449				*powner = NULL;
1450		}
1451	}
 
1452}
1453
1454/* The caller must hold udev's lock */
1455bool usb_device_is_owned(struct usb_device *udev)
1456{
1457	struct usb_hub *hub;
1458
1459	if (udev->state == USB_STATE_NOTATTACHED || !udev->parent)
1460		return false;
1461	hub = hdev_to_hub(udev->parent);
1462	return !!hub->port_owners[udev->portnum - 1];
1463}
1464
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1465
1466static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1467{
 
1468	int i;
1469
1470	for (i = 0; i < udev->maxchild; ++i) {
1471		if (udev->children[i])
1472			recursively_mark_NOTATTACHED(udev->children[i]);
1473	}
1474	if (udev->state == USB_STATE_SUSPENDED)
1475		udev->active_duration -= jiffies;
1476	udev->state = USB_STATE_NOTATTACHED;
 
1477}
1478
1479/**
1480 * usb_set_device_state - change a device's current state (usbcore, hcds)
1481 * @udev: pointer to device whose state should be changed
1482 * @new_state: new state value to be stored
1483 *
1484 * udev->state is _not_ fully protected by the device lock.  Although
1485 * most transitions are made only while holding the lock, the state can
1486 * can change to USB_STATE_NOTATTACHED at almost any time.  This
1487 * is so that devices can be marked as disconnected as soon as possible,
1488 * without having to wait for any semaphores to be released.  As a result,
1489 * all changes to any device's state must be protected by the
1490 * device_state_lock spinlock.
1491 *
1492 * Once a device has been added to the device tree, all changes to its state
1493 * should be made using this routine.  The state should _not_ be set directly.
1494 *
1495 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1496 * Otherwise udev->state is set to new_state, and if new_state is
1497 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1498 * to USB_STATE_NOTATTACHED.
1499 */
1500void usb_set_device_state(struct usb_device *udev,
1501		enum usb_device_state new_state)
1502{
1503	unsigned long flags;
1504	int wakeup = -1;
1505
1506	spin_lock_irqsave(&device_state_lock, flags);
1507	if (udev->state == USB_STATE_NOTATTACHED)
1508		;	/* do nothing */
1509	else if (new_state != USB_STATE_NOTATTACHED) {
1510
1511		/* root hub wakeup capabilities are managed out-of-band
1512		 * and may involve silicon errata ... ignore them here.
1513		 */
1514		if (udev->parent) {
1515			if (udev->state == USB_STATE_SUSPENDED
1516					|| new_state == USB_STATE_SUSPENDED)
1517				;	/* No change to wakeup settings */
1518			else if (new_state == USB_STATE_CONFIGURED)
1519				wakeup = udev->actconfig->desc.bmAttributes
1520					 & USB_CONFIG_ATT_WAKEUP;
 
 
1521			else
1522				wakeup = 0;
1523		}
1524		if (udev->state == USB_STATE_SUSPENDED &&
1525			new_state != USB_STATE_SUSPENDED)
1526			udev->active_duration -= jiffies;
1527		else if (new_state == USB_STATE_SUSPENDED &&
1528				udev->state != USB_STATE_SUSPENDED)
1529			udev->active_duration += jiffies;
1530		udev->state = new_state;
 
1531	} else
1532		recursively_mark_NOTATTACHED(udev);
1533	spin_unlock_irqrestore(&device_state_lock, flags);
1534	if (wakeup >= 0)
1535		device_set_wakeup_capable(&udev->dev, wakeup);
1536}
1537EXPORT_SYMBOL_GPL(usb_set_device_state);
1538
1539/*
1540 * Choose a device number.
1541 *
1542 * Device numbers are used as filenames in usbfs.  On USB-1.1 and
1543 * USB-2.0 buses they are also used as device addresses, however on
1544 * USB-3.0 buses the address is assigned by the controller hardware
1545 * and it usually is not the same as the device number.
1546 *
1547 * WUSB devices are simple: they have no hubs behind, so the mapping
1548 * device <-> virtual port number becomes 1:1. Why? to simplify the
1549 * life of the device connection logic in
1550 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
1551 * handshake we need to assign a temporary address in the unauthorized
1552 * space. For simplicity we use the first virtual port number found to
1553 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
1554 * and that becomes it's address [X < 128] or its unauthorized address
1555 * [X | 0x80].
1556 *
1557 * We add 1 as an offset to the one-based USB-stack port number
1558 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
1559 * 0 is reserved by USB for default address; (b) Linux's USB stack
1560 * uses always #1 for the root hub of the controller. So USB stack's
1561 * port #1, which is wusb virtual-port #0 has address #2.
1562 *
1563 * Devices connected under xHCI are not as simple.  The host controller
1564 * supports virtualization, so the hardware assigns device addresses and
1565 * the HCD must setup data structures before issuing a set address
1566 * command to the hardware.
1567 */
1568static void choose_devnum(struct usb_device *udev)
1569{
1570	int		devnum;
1571	struct usb_bus	*bus = udev->bus;
1572
1573	/* If khubd ever becomes multithreaded, this will need a lock */
1574	if (udev->wusb) {
1575		devnum = udev->portnum + 1;
1576		BUG_ON(test_bit(devnum, bus->devmap.devicemap));
1577	} else {
1578		/* Try to allocate the next devnum beginning at
1579		 * bus->devnum_next. */
1580		devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1581					    bus->devnum_next);
1582		if (devnum >= 128)
1583			devnum = find_next_zero_bit(bus->devmap.devicemap,
1584						    128, 1);
1585		bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1586	}
1587	if (devnum < 128) {
1588		set_bit(devnum, bus->devmap.devicemap);
1589		udev->devnum = devnum;
1590	}
 
1591}
1592
1593static void release_devnum(struct usb_device *udev)
1594{
1595	if (udev->devnum > 0) {
1596		clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1597		udev->devnum = -1;
1598	}
1599}
1600
1601static void update_devnum(struct usb_device *udev, int devnum)
1602{
1603	/* The address for a WUSB device is managed by wusbcore. */
1604	if (!udev->wusb)
1605		udev->devnum = devnum;
1606}
1607
1608static void hub_free_dev(struct usb_device *udev)
1609{
1610	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
1611
1612	/* Root hubs aren't real devices, so don't free HCD resources */
1613	if (hcd->driver->free_dev && udev->parent)
1614		hcd->driver->free_dev(hcd, udev);
1615}
1616
 
 
 
 
 
 
 
 
 
 
 
 
1617/**
1618 * usb_disconnect - disconnect a device (usbcore-internal)
1619 * @pdev: pointer to device being disconnected
1620 * Context: !in_interrupt ()
 
1621 *
1622 * Something got disconnected. Get rid of it and all of its children.
1623 *
1624 * If *pdev is a normal device then the parent hub must already be locked.
1625 * If *pdev is a root hub then this routine will acquire the
1626 * usb_bus_list_lock on behalf of the caller.
1627 *
1628 * Only hub drivers (including virtual root hub drivers for host
1629 * controllers) should ever call this.
1630 *
1631 * This call is synchronous, and may not be used in an interrupt context.
1632 */
1633void usb_disconnect(struct usb_device **pdev)
1634{
1635	struct usb_device	*udev = *pdev;
1636	int			i;
1637	struct usb_hcd		*hcd = bus_to_hcd(udev->bus);
1638
1639	if (!udev) {
1640		pr_debug ("%s nodev\n", __func__);
1641		return;
1642	}
1643
1644	/* mark the device as inactive, so any further urb submissions for
1645	 * this device (and any of its children) will fail immediately.
1646	 * this quiesces everything except pending urbs.
1647	 */
1648	usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1649	dev_info(&udev->dev, "USB disconnect, device number %d\n",
1650			udev->devnum);
1651
 
 
 
 
 
 
1652	usb_lock_device(udev);
1653
1654	/* Free up all the children before we remove this device */
1655	for (i = 0; i < USB_MAXCHILDREN; i++) {
1656		if (udev->children[i])
1657			usb_disconnect(&udev->children[i]);
1658	}
1659
1660	/* deallocate hcd/hardware state ... nuking all pending urbs and
1661	 * cleaning up all state associated with the current configuration
1662	 * so that the hardware is now fully quiesced.
1663	 */
1664	dev_dbg (&udev->dev, "unregistering device\n");
1665	mutex_lock(hcd->bandwidth_mutex);
1666	usb_disable_device(udev, 0);
1667	mutex_unlock(hcd->bandwidth_mutex);
1668	usb_hcd_synchronize_unlinks(udev);
1669
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1670	usb_remove_ep_devs(&udev->ep0);
1671	usb_unlock_device(udev);
1672
1673	/* Unregister the device.  The device driver is responsible
1674	 * for de-configuring the device and invoking the remove-device
1675	 * notifier chain (used by usbfs and possibly others).
1676	 */
1677	device_del(&udev->dev);
1678
1679	/* Free the device number and delete the parent's children[]
1680	 * (or root_hub) pointer.
1681	 */
1682	release_devnum(udev);
1683
1684	/* Avoid races with recursively_mark_NOTATTACHED() */
1685	spin_lock_irq(&device_state_lock);
1686	*pdev = NULL;
1687	spin_unlock_irq(&device_state_lock);
1688
 
 
 
1689	hub_free_dev(udev);
1690
1691	put_device(&udev->dev);
1692}
1693
1694#ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
1695static void show_string(struct usb_device *udev, char *id, char *string)
1696{
1697	if (!string)
1698		return;
1699	dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1700}
1701
1702static void announce_device(struct usb_device *udev)
1703{
1704	dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n",
 
 
 
1705		le16_to_cpu(udev->descriptor.idVendor),
1706		le16_to_cpu(udev->descriptor.idProduct));
 
1707	dev_info(&udev->dev,
1708		"New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
1709		udev->descriptor.iManufacturer,
1710		udev->descriptor.iProduct,
1711		udev->descriptor.iSerialNumber);
1712	show_string(udev, "Product", udev->product);
1713	show_string(udev, "Manufacturer", udev->manufacturer);
1714	show_string(udev, "SerialNumber", udev->serial);
1715}
1716#else
1717static inline void announce_device(struct usb_device *udev) { }
1718#endif
1719
1720#ifdef	CONFIG_USB_OTG
1721#include "otg_whitelist.h"
1722#endif
1723
1724/**
1725 * usb_enumerate_device_otg - FIXME (usbcore-internal)
1726 * @udev: newly addressed device (in ADDRESS state)
1727 *
1728 * Finish enumeration for On-The-Go devices
 
 
1729 */
1730static int usb_enumerate_device_otg(struct usb_device *udev)
1731{
1732	int err = 0;
1733
1734#ifdef	CONFIG_USB_OTG
1735	/*
1736	 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1737	 * to wake us after we've powered off VBUS; and HNP, switching roles
1738	 * "host" to "peripheral".  The OTG descriptor helps figure this out.
1739	 */
1740	if (!udev->bus->is_b_host
1741			&& udev->config
1742			&& udev->parent == udev->bus->root_hub) {
1743		struct usb_otg_descriptor	*desc = NULL;
1744		struct usb_bus			*bus = udev->bus;
 
1745
1746		/* descriptor may appear anywhere in config */
1747		if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1748					le16_to_cpu(udev->config[0].desc.wTotalLength),
1749					USB_DT_OTG, (void **) &desc) == 0) {
1750			if (desc->bmAttributes & USB_OTG_HNP) {
1751				unsigned		port1 = udev->portnum;
1752
1753				dev_info(&udev->dev,
1754					"Dual-Role OTG device on %sHNP port\n",
1755					(port1 == bus->otg_port)
1756						? "" : "non-");
1757
1758				/* enable HNP before suspend, it's simpler */
1759				if (port1 == bus->otg_port)
1760					bus->b_hnp_enable = 1;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1761				err = usb_control_msg(udev,
1762					usb_sndctrlpipe(udev, 0),
1763					USB_REQ_SET_FEATURE, 0,
1764					bus->b_hnp_enable
1765						? USB_DEVICE_B_HNP_ENABLE
1766						: USB_DEVICE_A_ALT_HNP_SUPPORT,
1767					0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1768				if (err < 0) {
1769					/* OTG MESSAGE: report errors here,
1770					 * customize to match your product.
1771					 */
1772					dev_info(&udev->dev,
1773						"can't set HNP mode: %d\n",
1774						err);
1775					bus->b_hnp_enable = 0;
1776				}
1777			}
1778		}
1779	}
1780
1781	if (!is_targeted(udev)) {
1782
1783		/* Maybe it can talk to us, though we can't talk to it.
1784		 * (Includes HNP test device.)
1785		 */
1786		if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1787			err = usb_port_suspend(udev, PMSG_SUSPEND);
1788			if (err < 0)
1789				dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1790		}
1791		err = -ENOTSUPP;
1792		goto fail;
1793	}
1794fail:
1795#endif
1796	return err;
1797}
1798
1799
1800/**
1801 * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
1802 * @udev: newly addressed device (in ADDRESS state)
1803 *
1804 * This is only called by usb_new_device() and usb_authorize_device()
1805 * and FIXME -- all comments that apply to them apply here wrt to
1806 * environment.
1807 *
1808 * If the device is WUSB and not authorized, we don't attempt to read
1809 * the string descriptors, as they will be errored out by the device
1810 * until it has been authorized.
 
 
1811 */
1812static int usb_enumerate_device(struct usb_device *udev)
1813{
1814	int err;
 
1815
1816	if (udev->config == NULL) {
1817		err = usb_get_configuration(udev);
1818		if (err < 0) {
1819			dev_err(&udev->dev, "can't read configurations, error %d\n",
1820				err);
1821			goto fail;
 
1822		}
1823	}
1824	if (udev->wusb == 1 && udev->authorized == 0) {
1825		udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1826		udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1827		udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1828	}
1829	else {
1830		/* read the standard strings and cache them if present */
1831		udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1832		udev->manufacturer = usb_cache_string(udev,
1833						      udev->descriptor.iManufacturer);
1834		udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1835	}
1836	err = usb_enumerate_device_otg(udev);
1837fail:
1838	return err;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1839}
1840
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1841
1842/**
1843 * usb_new_device - perform initial device setup (usbcore-internal)
1844 * @udev: newly addressed device (in ADDRESS state)
1845 *
1846 * This is called with devices which have been detected but not fully
1847 * enumerated.  The device descriptor is available, but not descriptors
1848 * for any device configuration.  The caller must have locked either
1849 * the parent hub (if udev is a normal device) or else the
1850 * usb_bus_list_lock (if udev is a root hub).  The parent's pointer to
1851 * udev has already been installed, but udev is not yet visible through
1852 * sysfs or other filesystem code.
1853 *
1854 * It will return if the device is configured properly or not.  Zero if
1855 * the interface was registered with the driver core; else a negative
1856 * errno value.
1857 *
1858 * This call is synchronous, and may not be used in an interrupt context.
1859 *
1860 * Only the hub driver or root-hub registrar should ever call this.
 
 
 
 
 
1861 */
1862int usb_new_device(struct usb_device *udev)
1863{
1864	int err;
1865
1866	if (udev->parent) {
1867		/* Initialize non-root-hub device wakeup to disabled;
1868		 * device (un)configuration controls wakeup capable
1869		 * sysfs power/wakeup controls wakeup enabled/disabled
1870		 */
1871		device_init_wakeup(&udev->dev, 0);
1872	}
1873
1874	/* Tell the runtime-PM framework the device is active */
1875	pm_runtime_set_active(&udev->dev);
1876	pm_runtime_get_noresume(&udev->dev);
1877	pm_runtime_use_autosuspend(&udev->dev);
1878	pm_runtime_enable(&udev->dev);
1879
1880	/* By default, forbid autosuspend for all devices.  It will be
1881	 * allowed for hubs during binding.
1882	 */
1883	usb_disable_autosuspend(udev);
1884
1885	err = usb_enumerate_device(udev);	/* Read descriptors */
1886	if (err < 0)
1887		goto fail;
1888	dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n",
1889			udev->devnum, udev->bus->busnum,
1890			(((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1891	/* export the usbdev device-node for libusb */
1892	udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
1893			(((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1894
1895	/* Tell the world! */
1896	announce_device(udev);
1897
 
 
 
 
 
 
 
 
1898	device_enable_async_suspend(&udev->dev);
 
 
 
 
1899	/* Register the device.  The device driver is responsible
1900	 * for configuring the device and invoking the add-device
1901	 * notifier chain (used by usbfs and possibly others).
1902	 */
1903	err = device_add(&udev->dev);
1904	if (err) {
1905		dev_err(&udev->dev, "can't device_add, error %d\n", err);
1906		goto fail;
1907	}
1908
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1909	(void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev);
1910	usb_mark_last_busy(udev);
1911	pm_runtime_put_sync_autosuspend(&udev->dev);
1912	return err;
1913
1914fail:
1915	usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1916	pm_runtime_disable(&udev->dev);
1917	pm_runtime_set_suspended(&udev->dev);
1918	return err;
1919}
1920
1921
1922/**
1923 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
1924 * @usb_dev: USB device
1925 *
1926 * Move the USB device to a very basic state where interfaces are disabled
1927 * and the device is in fact unconfigured and unusable.
1928 *
1929 * We share a lock (that we have) with device_del(), so we need to
1930 * defer its call.
 
 
1931 */
1932int usb_deauthorize_device(struct usb_device *usb_dev)
1933{
1934	usb_lock_device(usb_dev);
1935	if (usb_dev->authorized == 0)
1936		goto out_unauthorized;
1937
1938	usb_dev->authorized = 0;
1939	usb_set_configuration(usb_dev, -1);
1940
1941	kfree(usb_dev->product);
1942	usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1943	kfree(usb_dev->manufacturer);
1944	usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1945	kfree(usb_dev->serial);
1946	usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1947
1948	usb_destroy_configuration(usb_dev);
1949	usb_dev->descriptor.bNumConfigurations = 0;
1950
1951out_unauthorized:
1952	usb_unlock_device(usb_dev);
1953	return 0;
1954}
1955
1956
1957int usb_authorize_device(struct usb_device *usb_dev)
1958{
1959	int result = 0, c;
1960
1961	usb_lock_device(usb_dev);
1962	if (usb_dev->authorized == 1)
1963		goto out_authorized;
1964
1965	result = usb_autoresume_device(usb_dev);
1966	if (result < 0) {
1967		dev_err(&usb_dev->dev,
1968			"can't autoresume for authorization: %d\n", result);
1969		goto error_autoresume;
1970	}
1971	result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
1972	if (result < 0) {
1973		dev_err(&usb_dev->dev, "can't re-read device descriptor for "
1974			"authorization: %d\n", result);
1975		goto error_device_descriptor;
1976	}
1977
1978	kfree(usb_dev->product);
1979	usb_dev->product = NULL;
1980	kfree(usb_dev->manufacturer);
1981	usb_dev->manufacturer = NULL;
1982	kfree(usb_dev->serial);
1983	usb_dev->serial = NULL;
1984
1985	usb_dev->authorized = 1;
1986	result = usb_enumerate_device(usb_dev);
1987	if (result < 0)
1988		goto error_enumerate;
1989	/* Choose and set the configuration.  This registers the interfaces
1990	 * with the driver core and lets interface drivers bind to them.
1991	 */
1992	c = usb_choose_configuration(usb_dev);
1993	if (c >= 0) {
1994		result = usb_set_configuration(usb_dev, c);
1995		if (result) {
1996			dev_err(&usb_dev->dev,
1997				"can't set config #%d, error %d\n", c, result);
1998			/* This need not be fatal.  The user can try to
1999			 * set other configurations. */
2000		}
2001	}
2002	dev_info(&usb_dev->dev, "authorized to connect\n");
2003
2004error_enumerate:
2005error_device_descriptor:
2006	usb_autosuspend_device(usb_dev);
2007error_autoresume:
2008out_authorized:
2009	usb_unlock_device(usb_dev);	// complements locktree
2010	return result;
2011}
2012
2013
2014/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
2015static unsigned hub_is_wusb(struct usb_hub *hub)
 
 
 
 
 
 
 
 
2016{
2017	struct usb_hcd *hcd;
2018	if (hub->hdev->parent != NULL)  /* not a root hub? */
2019		return 0;
2020	hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
2021	return hcd->wireless;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2022}
2023
 
 
 
 
 
 
2024
 
2025#define PORT_RESET_TRIES	5
2026#define SET_ADDRESS_TRIES	2
2027#define GET_DESCRIPTOR_TRIES	2
2028#define SET_CONFIG_TRIES	(2 * (use_both_schemes + 1))
2029#define USE_NEW_SCHEME(i)	((i) / 2 == old_scheme_first)
 
2030
2031#define HUB_ROOT_RESET_TIME	50	/* times are in msec */
 
 
2032#define HUB_SHORT_RESET_TIME	10
 
2033#define HUB_LONG_RESET_TIME	200
2034#define HUB_RESET_TIMEOUT	500
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2035
2036static int hub_port_wait_reset(struct usb_hub *hub, int port1,
2037				struct usb_device *udev, unsigned int delay)
2038{
2039	int delay_time, ret;
2040	u16 portstatus;
2041	u16 portchange;
 
2042
2043	for (delay_time = 0;
2044			delay_time < HUB_RESET_TIMEOUT;
2045			delay_time += delay) {
2046		/* wait to give the device a chance to reset */
2047		msleep(delay);
2048
2049		/* read and decode port status */
2050		ret = hub_port_status(hub, port1, &portstatus, &portchange);
 
 
 
 
 
 
 
2051		if (ret < 0)
2052			return ret;
2053
2054		/* Device went away? */
2055		if (!(portstatus & USB_PORT_STAT_CONNECTION))
2056			return -ENOTCONN;
2057
2058		/* bomb out completely if the connection bounced */
2059		if ((portchange & USB_PORT_STAT_C_CONNECTION))
2060			return -ENOTCONN;
2061
2062		/* if we`ve finished resetting, then break out of the loop */
2063		if (!(portstatus & USB_PORT_STAT_RESET) &&
2064		    (portstatus & USB_PORT_STAT_ENABLE)) {
2065			if (hub_is_wusb(hub))
2066				udev->speed = USB_SPEED_WIRELESS;
2067			else if (hub_is_superspeed(hub->hdev))
2068				udev->speed = USB_SPEED_SUPER;
2069			else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
2070				udev->speed = USB_SPEED_HIGH;
2071			else if (portstatus & USB_PORT_STAT_LOW_SPEED)
2072				udev->speed = USB_SPEED_LOW;
2073			else
2074				udev->speed = USB_SPEED_FULL;
2075			return 0;
2076		}
2077
2078		/* switch to the long delay after two short delay failures */
2079		if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
2080			delay = HUB_LONG_RESET_TIME;
2081
2082		dev_dbg (hub->intfdev,
2083			"port %d not reset yet, waiting %dms\n",
2084			port1, delay);
2085	}
2086
2087	return -EBUSY;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2088}
2089
 
2090static int hub_port_reset(struct usb_hub *hub, int port1,
2091				struct usb_device *udev, unsigned int delay)
2092{
2093	int i, status;
2094	struct usb_hcd *hcd;
 
 
2095
2096	hcd = bus_to_hcd(udev->bus);
2097	/* Block EHCI CF initialization during the port reset.
2098	 * Some companion controllers don't like it when they mix.
2099	 */
2100	down_read(&ehci_cf_port_reset_rwsem);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2101
2102	/* Reset the port */
2103	for (i = 0; i < PORT_RESET_TRIES; i++) {
2104		status = set_port_feature(hub->hdev,
2105				port1, USB_PORT_FEAT_RESET);
2106		if (status)
2107			dev_err(hub->intfdev,
2108					"cannot reset port %d (err = %d)\n",
2109					port1, status);
2110		else {
2111			status = hub_port_wait_reset(hub, port1, udev, delay);
2112			if (status && status != -ENOTCONN)
 
 
 
 
2113				dev_dbg(hub->intfdev,
2114						"port_wait_reset: err = %d\n",
2115						status);
2116		}
2117
2118		/* return on disconnect or reset */
2119		switch (status) {
2120		case 0:
2121			/* TRSTRCY = 10 ms; plus some extra */
2122			msleep(10 + 40);
2123			update_devnum(udev, 0);
2124			if (hcd->driver->reset_device) {
2125				status = hcd->driver->reset_device(hcd, udev);
2126				if (status < 0) {
2127					dev_err(&udev->dev, "Cannot reset "
2128							"HCD device state\n");
2129					break;
2130				}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2131			}
2132			/* FALL THROUGH */
2133		case -ENOTCONN:
2134		case -ENODEV:
2135			clear_port_feature(hub->hdev,
2136				port1, USB_PORT_FEAT_C_RESET);
2137			/* FIXME need disconnect() for NOTATTACHED device */
2138			usb_set_device_state(udev, status
2139					? USB_STATE_NOTATTACHED
2140					: USB_STATE_DEFAULT);
2141			goto done;
2142		}
2143
2144		dev_dbg (hub->intfdev,
2145			"port %d not enabled, trying reset again...\n",
2146			port1);
2147		delay = HUB_LONG_RESET_TIME;
2148	}
2149
2150	dev_err (hub->intfdev,
2151		"Cannot enable port %i.  Maybe the USB cable is bad?\n",
2152		port1);
2153
2154 done:
2155	up_read(&ehci_cf_port_reset_rwsem);
2156	return status;
2157}
 
 
 
2158
2159/* Warm reset a USB3 protocol port */
2160static int hub_port_warm_reset(struct usb_hub *hub, int port)
2161{
2162	int ret;
2163	u16 portstatus, portchange;
2164
2165	if (!hub_is_superspeed(hub->hdev)) {
2166		dev_err(hub->intfdev, "only USB3 hub support warm reset\n");
2167		return -EINVAL;
2168	}
2169
2170	/* Warm reset the port */
2171	ret = set_port_feature(hub->hdev,
2172				port, USB_PORT_FEAT_BH_PORT_RESET);
2173	if (ret) {
2174		dev_err(hub->intfdev, "cannot warm reset port %d\n", port);
2175		return ret;
 
 
 
 
 
 
 
 
 
2176	}
2177
2178	msleep(20);
2179	ret = hub_port_status(hub, port, &portstatus, &portchange);
2180
2181	if (portchange & USB_PORT_STAT_C_RESET)
2182		clear_port_feature(hub->hdev, port, USB_PORT_FEAT_C_RESET);
2183
2184	if (portchange & USB_PORT_STAT_C_BH_RESET)
2185		clear_port_feature(hub->hdev, port,
2186					USB_PORT_FEAT_C_BH_PORT_RESET);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2187
2188	if (portchange & USB_PORT_STAT_C_LINK_STATE)
2189		clear_port_feature(hub->hdev, port,
2190					USB_PORT_FEAT_C_PORT_LINK_STATE);
 
 
 
 
 
 
 
 
 
2191
2192	return ret;
 
 
 
 
2193}
2194
2195/* Check if a port is power on */
2196static int port_is_power_on(struct usb_hub *hub, unsigned portstatus)
2197{
2198	int ret = 0;
2199
2200	if (hub_is_superspeed(hub->hdev)) {
2201		if (portstatus & USB_SS_PORT_STAT_POWER)
2202			ret = 1;
2203	} else {
2204		if (portstatus & USB_PORT_STAT_POWER)
2205			ret = 1;
2206	}
2207
2208	return ret;
2209}
2210
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2211#ifdef	CONFIG_PM
2212
2213/* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */
2214static int port_is_suspended(struct usb_hub *hub, unsigned portstatus)
2215{
2216	int ret = 0;
2217
2218	if (hub_is_superspeed(hub->hdev)) {
2219		if ((portstatus & USB_PORT_STAT_LINK_STATE)
2220				== USB_SS_PORT_LS_U3)
2221			ret = 1;
2222	} else {
2223		if (portstatus & USB_PORT_STAT_SUSPEND)
2224			ret = 1;
2225	}
2226
2227	return ret;
2228}
2229
2230/* Determine whether the device on a port is ready for a normal resume,
2231 * is ready for a reset-resume, or should be disconnected.
2232 */
2233static int check_port_resume_type(struct usb_device *udev,
2234		struct usb_hub *hub, int port1,
2235		int status, unsigned portchange, unsigned portstatus)
2236{
 
 
 
 
 
 
 
 
 
2237	/* Is the device still present? */
2238	if (status || port_is_suspended(hub, portstatus) ||
2239			!port_is_power_on(hub, portstatus) ||
2240			!(portstatus & USB_PORT_STAT_CONNECTION)) {
2241		if (status >= 0)
2242			status = -ENODEV;
 
 
 
 
 
 
 
 
2243	}
2244
2245	/* Can't do a normal resume if the port isn't enabled,
2246	 * so try a reset-resume instead.
2247	 */
2248	else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) {
2249		if (udev->persist_enabled)
2250			udev->reset_resume = 1;
2251		else
2252			status = -ENODEV;
2253	}
2254
2255	if (status) {
2256		dev_dbg(hub->intfdev,
2257				"port %d status %04x.%04x after resume, %d\n",
2258				port1, portchange, portstatus, status);
2259	} else if (udev->reset_resume) {
2260
2261		/* Late port handoff can set status-change bits */
2262		if (portchange & USB_PORT_STAT_C_CONNECTION)
2263			clear_port_feature(hub->hdev, port1,
2264					USB_PORT_FEAT_C_CONNECTION);
2265		if (portchange & USB_PORT_STAT_C_ENABLE)
2266			clear_port_feature(hub->hdev, port1,
2267					USB_PORT_FEAT_C_ENABLE);
 
 
 
 
 
 
 
 
 
2268	}
2269
2270	return status;
2271}
2272
2273#ifdef	CONFIG_USB_SUSPEND
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2274
2275/*
2276 * usb_port_suspend - suspend a usb device's upstream port
2277 * @udev: device that's no longer in active use, not a root hub
2278 * Context: must be able to sleep; device not locked; pm locks held
2279 *
2280 * Suspends a USB device that isn't in active use, conserving power.
2281 * Devices may wake out of a suspend, if anything important happens,
2282 * using the remote wakeup mechanism.  They may also be taken out of
2283 * suspend by the host, using usb_port_resume().  It's also routine
2284 * to disconnect devices while they are suspended.
2285 *
2286 * This only affects the USB hardware for a device; its interfaces
2287 * (and, for hubs, child devices) must already have been suspended.
2288 *
2289 * Selective port suspend reduces power; most suspended devices draw
2290 * less than 500 uA.  It's also used in OTG, along with remote wakeup.
2291 * All devices below the suspended port are also suspended.
2292 *
2293 * Devices leave suspend state when the host wakes them up.  Some devices
2294 * also support "remote wakeup", where the device can activate the USB
2295 * tree above them to deliver data, such as a keypress or packet.  In
2296 * some cases, this wakes the USB host.
2297 *
2298 * Suspending OTG devices may trigger HNP, if that's been enabled
2299 * between a pair of dual-role devices.  That will change roles, such
2300 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
2301 *
2302 * Devices on USB hub ports have only one "suspend" state, corresponding
2303 * to ACPI D2, "may cause the device to lose some context".
2304 * State transitions include:
2305 *
2306 *   - suspend, resume ... when the VBUS power link stays live
2307 *   - suspend, disconnect ... VBUS lost
2308 *
2309 * Once VBUS drop breaks the circuit, the port it's using has to go through
2310 * normal re-enumeration procedures, starting with enabling VBUS power.
2311 * Other than re-initializing the hub (plug/unplug, except for root hubs),
2312 * Linux (2.6) currently has NO mechanisms to initiate that:  no khubd
2313 * timer, no SRP, no requests through sysfs.
2314 *
2315 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
2316 * the root hub for their bus goes into global suspend ... so we don't
2317 * (falsely) update the device power state to say it suspended.
 
 
2318 *
2319 * Returns 0 on success, else negative errno.
2320 */
2321int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
2322{
2323	struct usb_hub	*hub = hdev_to_hub(udev->parent);
 
2324	int		port1 = udev->portnum;
2325	int		status;
 
2326
2327	// dev_dbg(hub->intfdev, "suspend port %d\n", port1);
2328
2329	/* enable remote wakeup when appropriate; this lets the device
2330	 * wake up the upstream hub (including maybe the root hub).
2331	 *
2332	 * NOTE:  OTG devices may issue remote wakeup (or SRP) even when
2333	 * we don't explicitly enable it here.
2334	 */
2335	if (udev->do_remote_wakeup) {
2336		status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2337				USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
2338				USB_DEVICE_REMOTE_WAKEUP, 0,
2339				NULL, 0,
2340				USB_CTRL_SET_TIMEOUT);
2341		if (status) {
2342			dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
2343					status);
2344			/* bail if autosuspend is requested */
2345			if (msg.event & PM_EVENT_AUTO)
2346				return status;
2347		}
2348	}
2349
 
 
 
 
 
 
 
 
 
 
2350	/* see 7.1.7.6 */
2351	if (hub_is_superspeed(hub->hdev))
2352		status = set_port_feature(hub->hdev,
2353				port1 | (USB_SS_PORT_LS_U3 << 3),
2354				USB_PORT_FEAT_LINK_STATE);
2355	else
 
 
 
 
 
 
 
 
 
 
2356		status = set_port_feature(hub->hdev, port1,
2357						USB_PORT_FEAT_SUSPEND);
 
 
 
 
2358	if (status) {
2359		dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
2360				port1, status);
2361		/* paranoia:  "should not happen" */
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2362		if (udev->do_remote_wakeup)
2363			(void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2364				USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
2365				USB_DEVICE_REMOTE_WAKEUP, 0,
2366				NULL, 0,
2367				USB_CTRL_SET_TIMEOUT);
2368
2369		/* System sleep transitions should never fail */
2370		if (!(msg.event & PM_EVENT_AUTO))
2371			status = 0;
2372	} else {
2373		/* device has up to 10 msec to fully suspend */
2374		dev_dbg(&udev->dev, "usb %ssuspend\n",
2375				(msg.event & PM_EVENT_AUTO ? "auto-" : ""));
 
 
 
 
 
 
 
2376		usb_set_device_state(udev, USB_STATE_SUSPENDED);
2377		msleep(10);
2378	}
 
 
 
 
 
2379	usb_mark_last_busy(hub->hdev);
 
 
2380	return status;
2381}
2382
2383/*
2384 * If the USB "suspend" state is in use (rather than "global suspend"),
2385 * many devices will be individually taken out of suspend state using
2386 * special "resume" signaling.  This routine kicks in shortly after
2387 * hardware resume signaling is finished, either because of selective
2388 * resume (by host) or remote wakeup (by device) ... now see what changed
2389 * in the tree that's rooted at this device.
2390 *
2391 * If @udev->reset_resume is set then the device is reset before the
2392 * status check is done.
2393 */
2394static int finish_port_resume(struct usb_device *udev)
2395{
2396	int	status = 0;
2397	u16	devstatus;
2398
2399	/* caller owns the udev device lock */
2400	dev_dbg(&udev->dev, "%s\n",
2401		udev->reset_resume ? "finish reset-resume" : "finish resume");
2402
2403	/* usb ch9 identifies four variants of SUSPENDED, based on what
2404	 * state the device resumes to.  Linux currently won't see the
2405	 * first two on the host side; they'd be inside hub_port_init()
2406	 * during many timeouts, but khubd can't suspend until later.
2407	 */
2408	usb_set_device_state(udev, udev->actconfig
2409			? USB_STATE_CONFIGURED
2410			: USB_STATE_ADDRESS);
2411
2412	/* 10.5.4.5 says not to reset a suspended port if the attached
2413	 * device is enabled for remote wakeup.  Hence the reset
2414	 * operation is carried out here, after the port has been
2415	 * resumed.
2416	 */
2417	if (udev->reset_resume)
 
 
 
 
 
 
2418 retry_reset_resume:
2419		status = usb_reset_and_verify_device(udev);
 
 
 
 
2420
2421 	/* 10.5.4.5 says be sure devices in the tree are still there.
2422 	 * For now let's assume the device didn't go crazy on resume,
2423	 * and device drivers will know about any resume quirks.
2424	 */
2425	if (status == 0) {
2426		devstatus = 0;
2427		status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
2428		if (status >= 0)
2429			status = (status > 0 ? 0 : -ENODEV);
2430
2431		/* If a normal resume failed, try doing a reset-resume */
2432		if (status && !udev->reset_resume && udev->persist_enabled) {
2433			dev_dbg(&udev->dev, "retry with reset-resume\n");
2434			udev->reset_resume = 1;
2435			goto retry_reset_resume;
2436		}
2437	}
2438
2439	if (status) {
2440		dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
2441				status);
2442	} else if (udev->actconfig) {
2443		le16_to_cpus(&devstatus);
2444		if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
2445			status = usb_control_msg(udev,
2446					usb_sndctrlpipe(udev, 0),
2447					USB_REQ_CLEAR_FEATURE,
2448						USB_RECIP_DEVICE,
2449					USB_DEVICE_REMOTE_WAKEUP, 0,
2450					NULL, 0,
2451					USB_CTRL_SET_TIMEOUT);
2452			if (status)
2453				dev_dbg(&udev->dev,
2454					"disable remote wakeup, status %d\n",
2455					status);
 
 
2456		}
 
 
 
 
 
2457		status = 0;
2458	}
2459	return status;
2460}
2461
2462/*
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2463 * usb_port_resume - re-activate a suspended usb device's upstream port
2464 * @udev: device to re-activate, not a root hub
2465 * Context: must be able to sleep; device not locked; pm locks held
2466 *
2467 * This will re-activate the suspended device, increasing power usage
2468 * while letting drivers communicate again with its endpoints.
2469 * USB resume explicitly guarantees that the power session between
2470 * the host and the device is the same as it was when the device
2471 * suspended.
2472 *
2473 * If @udev->reset_resume is set then this routine won't check that the
2474 * port is still enabled.  Furthermore, finish_port_resume() above will
2475 * reset @udev.  The end result is that a broken power session can be
2476 * recovered and @udev will appear to persist across a loss of VBUS power.
2477 *
2478 * For example, if a host controller doesn't maintain VBUS suspend current
2479 * during a system sleep or is reset when the system wakes up, all the USB
2480 * power sessions below it will be broken.  This is especially troublesome
2481 * for mass-storage devices containing mounted filesystems, since the
2482 * device will appear to have disconnected and all the memory mappings
2483 * to it will be lost.  Using the USB_PERSIST facility, the device can be
2484 * made to appear as if it had not disconnected.
2485 *
2486 * This facility can be dangerous.  Although usb_reset_and_verify_device() makes
2487 * every effort to insure that the same device is present after the
2488 * reset as before, it cannot provide a 100% guarantee.  Furthermore it's
2489 * quite possible for a device to remain unaltered but its media to be
2490 * changed.  If the user replaces a flash memory card while the system is
2491 * asleep, he will have only himself to blame when the filesystem on the
2492 * new card is corrupted and the system crashes.
2493 *
2494 * Returns 0 on success, else negative errno.
2495 */
2496int usb_port_resume(struct usb_device *udev, pm_message_t msg)
2497{
2498	struct usb_hub	*hub = hdev_to_hub(udev->parent);
 
2499	int		port1 = udev->portnum;
2500	int		status;
2501	u16		portchange, portstatus;
2502
2503	/* Skip the initial Clear-Suspend step for a remote wakeup */
2504	status = hub_port_status(hub, port1, &portstatus, &portchange);
2505	if (status == 0 && !port_is_suspended(hub, portstatus))
2506		goto SuspendCleared;
 
 
 
 
2507
2508	// dev_dbg(hub->intfdev, "resume port %d\n", port1);
2509
2510	set_bit(port1, hub->busy_bits);
 
 
 
 
 
 
2511
2512	/* see 7.1.7.7; affects power usage, but not budgeting */
2513	if (hub_is_superspeed(hub->hdev))
2514		status = set_port_feature(hub->hdev,
2515				port1 | (USB_SS_PORT_LS_U0 << 3),
2516				USB_PORT_FEAT_LINK_STATE);
2517	else
2518		status = clear_port_feature(hub->hdev,
2519				port1, USB_PORT_FEAT_SUSPEND);
2520	if (status) {
2521		dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
2522				port1, status);
2523	} else {
2524		/* drive resume for at least 20 msec */
2525		dev_dbg(&udev->dev, "usb %sresume\n",
2526				(msg.event & PM_EVENT_AUTO ? "auto-" : ""));
2527		msleep(25);
2528
2529		/* Virtual root hubs can trigger on GET_PORT_STATUS to
2530		 * stop resume signaling.  Then finish the resume
2531		 * sequence.
2532		 */
2533		status = hub_port_status(hub, port1, &portstatus, &portchange);
2534
2535		/* TRSMRCY = 10 msec */
2536		msleep(10);
2537	}
2538
2539 SuspendCleared:
2540	if (status == 0) {
 
2541		if (hub_is_superspeed(hub->hdev)) {
2542			if (portchange & USB_PORT_STAT_C_LINK_STATE)
2543				clear_port_feature(hub->hdev, port1,
2544					USB_PORT_FEAT_C_PORT_LINK_STATE);
2545		} else {
2546			if (portchange & USB_PORT_STAT_C_SUSPEND)
2547				clear_port_feature(hub->hdev, port1,
2548						USB_PORT_FEAT_C_SUSPEND);
2549		}
 
 
 
2550	}
2551
2552	clear_bit(port1, hub->busy_bits);
 
 
2553
2554	status = check_port_resume_type(udev,
2555			hub, port1, status, portchange, portstatus);
2556	if (status == 0)
2557		status = finish_port_resume(udev);
2558	if (status < 0) {
2559		dev_dbg(&udev->dev, "can't resume, status %d\n", status);
2560		hub_port_logical_disconnect(hub, port1);
 
 
 
 
 
 
2561	}
 
 
 
2562	return status;
2563}
2564
2565/* caller has locked udev */
2566int usb_remote_wakeup(struct usb_device *udev)
2567{
2568	int	status = 0;
2569
 
2570	if (udev->state == USB_STATE_SUSPENDED) {
2571		dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
2572		status = usb_autoresume_device(udev);
2573		if (status == 0) {
2574			/* Let the drivers do their thing, then... */
2575			usb_autosuspend_device(udev);
2576		}
2577	}
 
2578	return status;
2579}
2580
2581#else	/* CONFIG_USB_SUSPEND */
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2582
2583/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
 
 
2584
2585int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
2586{
2587	return 0;
 
 
 
 
 
 
 
 
2588}
2589
2590/* However we may need to do a reset-resume */
2591
2592int usb_port_resume(struct usb_device *udev, pm_message_t msg)
2593{
2594	struct usb_hub	*hub = hdev_to_hub(udev->parent);
2595	int		port1 = udev->portnum;
2596	int		status;
2597	u16		portchange, portstatus;
2598
2599	status = hub_port_status(hub, port1, &portstatus, &portchange);
2600	status = check_port_resume_type(udev,
2601			hub, port1, status, portchange, portstatus);
2602
2603	if (status) {
2604		dev_dbg(&udev->dev, "can't resume, status %d\n", status);
2605		hub_port_logical_disconnect(hub, port1);
2606	} else if (udev->reset_resume) {
2607		dev_dbg(&udev->dev, "reset-resume\n");
2608		status = usb_reset_and_verify_device(udev);
2609	}
2610	return status;
2611}
2612
2613#endif
2614
2615static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
2616{
2617	struct usb_hub		*hub = usb_get_intfdata (intf);
2618	struct usb_device	*hdev = hub->hdev;
2619	unsigned		port1;
2620
2621	/* Warn if children aren't already suspended */
 
 
 
 
2622	for (port1 = 1; port1 <= hdev->maxchild; port1++) {
2623		struct usb_device	*udev;
 
2624
2625		udev = hdev->children [port1-1];
2626		if (udev && udev->can_submit) {
2627			dev_warn(&intf->dev, "port %d nyet suspended\n", port1);
2628			if (msg.event & PM_EVENT_AUTO)
 
 
 
 
 
 
 
 
 
 
 
 
2629				return -EBUSY;
 
 
 
 
 
 
 
 
 
 
 
 
 
2630		}
2631	}
2632
2633	dev_dbg(&intf->dev, "%s\n", __func__);
2634
2635	/* stop khubd and related activity */
2636	hub_quiesce(hub, HUB_SUSPEND);
2637	return 0;
2638}
2639
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2640static int hub_resume(struct usb_interface *intf)
2641{
2642	struct usb_hub *hub = usb_get_intfdata(intf);
2643
2644	dev_dbg(&intf->dev, "%s\n", __func__);
2645	hub_activate(hub, HUB_RESUME);
 
 
 
 
 
 
 
 
2646	return 0;
2647}
2648
2649static int hub_reset_resume(struct usb_interface *intf)
2650{
2651	struct usb_hub *hub = usb_get_intfdata(intf);
2652
2653	dev_dbg(&intf->dev, "%s\n", __func__);
2654	hub_activate(hub, HUB_RESET_RESUME);
2655	return 0;
2656}
2657
2658/**
2659 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
2660 * @rhdev: struct usb_device for the root hub
2661 *
2662 * The USB host controller driver calls this function when its root hub
2663 * is resumed and Vbus power has been interrupted or the controller
2664 * has been reset.  The routine marks @rhdev as having lost power.
2665 * When the hub driver is resumed it will take notice and carry out
2666 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
2667 * the others will be disconnected.
2668 */
2669void usb_root_hub_lost_power(struct usb_device *rhdev)
2670{
2671	dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
2672	rhdev->reset_resume = 1;
2673}
2674EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
2675
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2676#else	/* CONFIG_PM */
2677
2678#define hub_suspend		NULL
2679#define hub_resume		NULL
2680#define hub_reset_resume	NULL
2681#endif
2682
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2683
2684/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2685 *
2686 * Between connect detection and reset signaling there must be a delay
2687 * of 100ms at least for debounce and power-settling.  The corresponding
2688 * timer shall restart whenever the downstream port detects a disconnect.
2689 * 
2690 * Apparently there are some bluetooth and irda-dongles and a number of
2691 * low-speed devices for which this debounce period may last over a second.
2692 * Not covered by the spec - but easy to deal with.
2693 *
2694 * This implementation uses a 1500ms total debounce timeout; if the
2695 * connection isn't stable by then it returns -ETIMEDOUT.  It checks
2696 * every 25ms for transient disconnects.  When the port status has been
2697 * unchanged for 100ms it returns the port status.
2698 */
2699static int hub_port_debounce(struct usb_hub *hub, int port1)
2700{
2701	int ret;
2702	int total_time, stable_time = 0;
2703	u16 portchange, portstatus;
2704	unsigned connection = 0xffff;
 
 
2705
2706	for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2707		ret = hub_port_status(hub, port1, &portstatus, &portchange);
2708		if (ret < 0)
2709			return ret;
2710
2711		if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2712		     (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2713			stable_time += HUB_DEBOUNCE_STEP;
 
 
2714			if (stable_time >= HUB_DEBOUNCE_STABLE)
2715				break;
2716		} else {
2717			stable_time = 0;
2718			connection = portstatus & USB_PORT_STAT_CONNECTION;
2719		}
2720
2721		if (portchange & USB_PORT_STAT_C_CONNECTION) {
2722			clear_port_feature(hub->hdev, port1,
2723					USB_PORT_FEAT_C_CONNECTION);
2724		}
2725
2726		if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2727			break;
2728		msleep(HUB_DEBOUNCE_STEP);
2729	}
2730
2731	dev_dbg (hub->intfdev,
2732		"debounce: port %d: total %dms stable %dms status 0x%x\n",
2733		port1, total_time, stable_time, portstatus);
2734
2735	if (stable_time < HUB_DEBOUNCE_STABLE)
2736		return -ETIMEDOUT;
2737	return portstatus;
2738}
2739
2740void usb_ep0_reinit(struct usb_device *udev)
2741{
2742	usb_disable_endpoint(udev, 0 + USB_DIR_IN, true);
2743	usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true);
2744	usb_enable_endpoint(udev, &udev->ep0, true);
2745}
2746EXPORT_SYMBOL_GPL(usb_ep0_reinit);
2747
2748#define usb_sndaddr0pipe()	(PIPE_CONTROL << 30)
2749#define usb_rcvaddr0pipe()	((PIPE_CONTROL << 30) | USB_DIR_IN)
2750
2751static int hub_set_address(struct usb_device *udev, int devnum)
2752{
2753	int retval;
 
2754	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
 
 
 
 
2755
2756	/*
2757	 * The host controller will choose the device address,
2758	 * instead of the core having chosen it earlier
2759	 */
2760	if (!hcd->driver->address_device && devnum <= 1)
2761		return -EINVAL;
2762	if (udev->state == USB_STATE_ADDRESS)
2763		return 0;
2764	if (udev->state != USB_STATE_DEFAULT)
2765		return -EINVAL;
2766	if (hcd->driver->address_device)
2767		retval = hcd->driver->address_device(hcd, udev);
2768	else
2769		retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2770				USB_REQ_SET_ADDRESS, 0, devnum, 0,
2771				NULL, 0, USB_CTRL_SET_TIMEOUT);
2772	if (retval == 0) {
2773		update_devnum(udev, devnum);
2774		/* Device now using proper address. */
2775		usb_set_device_state(udev, USB_STATE_ADDRESS);
2776		usb_ep0_reinit(udev);
2777	}
2778	return retval;
2779}
2780
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2781/* Reset device, (re)assign address, get device descriptor.
2782 * Device connection must be stable, no more debouncing needed.
2783 * Returns device in USB_STATE_ADDRESS, except on error.
2784 *
2785 * If this is called for an already-existing device (as part of
2786 * usb_reset_and_verify_device), the caller must own the device lock.  For a
2787 * newly detected device that is not accessible through any global
2788 * pointers, it's not necessary to lock the device.
 
 
 
 
 
 
 
 
2789 */
2790static int
2791hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2792		int retry_counter)
2793{
2794	static DEFINE_MUTEX(usb_address0_mutex);
2795
2796	struct usb_device	*hdev = hub->hdev;
2797	struct usb_hcd		*hcd = bus_to_hcd(hdev->bus);
2798	int			i, j, retval;
 
2799	unsigned		delay = HUB_SHORT_RESET_TIME;
2800	enum usb_device_speed	oldspeed = udev->speed;
2801	char 			*speed, *type;
2802	int			devnum = udev->devnum;
 
 
 
 
 
 
 
 
 
2803
2804	/* root hub ports have a slightly longer reset period
2805	 * (from USB 2.0 spec, section 7.1.7.5)
2806	 */
2807	if (!hdev->parent) {
2808		delay = HUB_ROOT_RESET_TIME;
2809		if (port1 == hdev->bus->otg_port)
2810			hdev->bus->b_hnp_enable = 0;
2811	}
2812
2813	/* Some low speed devices have problems with the quick delay, so */
2814	/*  be a bit pessimistic with those devices. RHbug #23670 */
2815	if (oldspeed == USB_SPEED_LOW)
2816		delay = HUB_LONG_RESET_TIME;
2817
2818	mutex_lock(&usb_address0_mutex);
2819
2820	/* Reset the device; full speed may morph to high speed */
2821	/* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
2822	retval = hub_port_reset(hub, port1, udev, delay);
2823	if (retval < 0)		/* error or disconnect */
2824		goto fail;
2825	/* success, speed is known */
2826
2827	retval = -ENODEV;
2828
2829	if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
 
 
2830		dev_dbg(&udev->dev, "device reset changed speed!\n");
2831		goto fail;
2832	}
2833	oldspeed = udev->speed;
2834
2835	/* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2836	 * it's fixed size except for full speed devices.
2837	 * For Wireless USB devices, ep0 max packet is always 512 (tho
2838	 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2839	 */
2840	switch (udev->speed) {
2841	case USB_SPEED_SUPER:
2842	case USB_SPEED_WIRELESS:	/* fixed at 512 */
2843		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
2844		break;
2845	case USB_SPEED_HIGH:		/* fixed at 64 */
2846		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
2847		break;
2848	case USB_SPEED_FULL:		/* 8, 16, 32, or 64 */
2849		/* to determine the ep0 maxpacket size, try to read
2850		 * the device descriptor to get bMaxPacketSize0 and
2851		 * then correct our initial guess.
2852		 */
2853		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
2854		break;
2855	case USB_SPEED_LOW:		/* fixed at 8 */
2856		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8);
2857		break;
2858	default:
2859		goto fail;
2860	}
2861 
2862	type = "";
2863	switch (udev->speed) {
2864	case USB_SPEED_LOW:	speed = "low";	break;
2865	case USB_SPEED_FULL:	speed = "full";	break;
2866	case USB_SPEED_HIGH:	speed = "high";	break;
2867	case USB_SPEED_SUPER:
2868				speed = "super";
2869				break;
2870	case USB_SPEED_WIRELESS:
2871				speed = "variable";
2872				type = "Wireless ";
2873				break;
2874	default: 		speed = "?";	break;
2875	}
2876	if (udev->speed != USB_SPEED_SUPER)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2877		dev_info(&udev->dev,
2878				"%s %s speed %sUSB device number %d using %s\n",
2879				(udev->config) ? "reset" : "new", speed, type,
2880				devnum, udev->bus->controller->driver->name);
2881
2882	/* Set up TT records, if needed  */
2883	if (hdev->tt) {
2884		udev->tt = hdev->tt;
2885		udev->ttport = hdev->ttport;
2886	} else if (udev->speed != USB_SPEED_HIGH
2887			&& hdev->speed == USB_SPEED_HIGH) {
2888		if (!hub->tt.hub) {
2889			dev_err(&udev->dev, "parent hub has no TT\n");
2890			retval = -EINVAL;
2891			goto fail;
 
 
 
 
2892		}
2893		udev->tt = &hub->tt;
2894		udev->ttport = port1;
2895	}
2896 
2897	/* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2898	 * Because device hardware and firmware is sometimes buggy in
2899	 * this area, and this is how Linux has done it for ages.
2900	 * Change it cautiously.
2901	 *
2902	 * NOTE:  If USE_NEW_SCHEME() is true we will start by issuing
2903	 * a 64-byte GET_DESCRIPTOR request.  This is what Windows does,
2904	 * so it may help with some non-standards-compliant devices.
2905	 * Otherwise we start with SET_ADDRESS and then try to read the
2906	 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2907	 * value.
2908	 */
2909	for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2910		if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) {
2911			struct usb_device_descriptor *buf;
2912			int r = 0;
2913
2914#define GET_DESCRIPTOR_BUFSIZE	64
2915			buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2916			if (!buf) {
2917				retval = -ENOMEM;
2918				continue;
 
 
 
 
 
 
 
 
2919			}
2920
2921			/* Retry on all errors; some devices are flakey.
2922			 * 255 is for WUSB devices, we actually need to use
2923			 * 512 (WUSB1.0[4.8.1]).
2924			 */
2925			for (j = 0; j < 3; ++j) {
2926				buf->bMaxPacketSize0 = 0;
2927				r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2928					USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2929					USB_DT_DEVICE << 8, 0,
2930					buf, GET_DESCRIPTOR_BUFSIZE,
2931					initial_descriptor_timeout);
2932				switch (buf->bMaxPacketSize0) {
2933				case 8: case 16: case 32: case 64: case 255:
2934					if (buf->bDescriptorType ==
2935							USB_DT_DEVICE) {
2936						r = 0;
2937						break;
2938					}
2939					/* FALL THROUGH */
2940				default:
2941					if (r == 0)
2942						r = -EPROTO;
2943					break;
2944				}
2945				if (r == 0)
2946					break;
2947			}
2948			udev->descriptor.bMaxPacketSize0 =
2949					buf->bMaxPacketSize0;
2950			kfree(buf);
2951
2952			retval = hub_port_reset(hub, port1, udev, delay);
2953			if (retval < 0)		/* error or disconnect */
2954				goto fail;
2955			if (oldspeed != udev->speed) {
2956				dev_dbg(&udev->dev,
2957					"device reset changed speed!\n");
2958				retval = -ENODEV;
2959				goto fail;
2960			}
2961			if (r) {
2962				dev_err(&udev->dev,
2963					"device descriptor read/64, error %d\n",
2964					r);
2965				retval = -EMSGSIZE;
2966				continue;
2967			}
2968#undef GET_DESCRIPTOR_BUFSIZE
2969		}
2970
2971 		/*
2972 		 * If device is WUSB, we already assigned an
2973 		 * unauthorized address in the Connect Ack sequence;
2974 		 * authorization will assign the final address.
2975 		 */
2976		if (udev->wusb == 0) {
2977			for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2978				retval = hub_set_address(udev, devnum);
2979				if (retval >= 0)
2980					break;
2981				msleep(200);
2982			}
2983			if (retval < 0) {
2984				dev_err(&udev->dev,
2985					"device not accepting address %d, error %d\n",
2986					devnum, retval);
2987				goto fail;
2988			}
2989			if (udev->speed == USB_SPEED_SUPER) {
2990				devnum = udev->devnum;
2991				dev_info(&udev->dev,
2992						"%s SuperSpeed USB device number %d using %s\n",
2993						(udev->config) ? "reset" : "new",
2994						devnum, udev->bus->controller->driver->name);
2995			}
2996
2997			/* cope with hardware quirkiness:
2998			 *  - let SET_ADDRESS settle, some device hardware wants it
2999			 *  - read ep0 maxpacket even for high and low speed,
3000			 */
3001			msleep(10);
3002			if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3))
3003				break;
3004  		}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3005
3006		retval = usb_get_device_descriptor(udev, 8);
3007		if (retval < 8) {
3008			dev_err(&udev->dev,
 
 
 
 
 
3009					"device descriptor read/8, error %d\n",
3010					retval);
3011			if (retval >= 0)
3012				retval = -EMSGSIZE;
3013		} else {
3014			retval = 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3015			break;
3016		}
3017	}
3018	if (retval)
3019		goto fail;
3020
3021	if (udev->descriptor.bMaxPacketSize0 == 0xff ||
3022			udev->speed == USB_SPEED_SUPER)
3023		i = 512;
3024	else
3025		i = udev->descriptor.bMaxPacketSize0;
3026	if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
3027		if (udev->speed == USB_SPEED_LOW ||
3028				!(i == 8 || i == 16 || i == 32 || i == 64)) {
3029			dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i);
3030			retval = -EMSGSIZE;
3031			goto fail;
3032		}
 
 
 
 
 
 
 
3033		if (udev->speed == USB_SPEED_FULL)
3034			dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
3035		else
3036			dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i);
3037		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
3038		usb_ep0_reinit(udev);
 
 
 
 
 
3039	}
3040  
3041	retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
3042	if (retval < (signed)sizeof(udev->descriptor)) {
3043		dev_err(&udev->dev, "device descriptor read/all, error %d\n",
3044			retval);
3045		if (retval >= 0)
3046			retval = -ENOMSG;
3047		goto fail;
3048	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3049
3050	retval = 0;
3051	/* notify HCD that we have a device connected and addressed */
3052	if (hcd->driver->update_device)
3053		hcd->driver->update_device(hcd, udev);
 
3054fail:
3055	if (retval) {
3056		hub_port_disable(hub, port1, 0);
3057		update_devnum(udev, devnum);	/* for disconnect processing */
3058	}
3059	mutex_unlock(&usb_address0_mutex);
3060	return retval;
3061}
3062
3063static void
3064check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
3065{
3066	struct usb_qualifier_descriptor	*qual;
3067	int				status;
3068
3069	qual = kmalloc (sizeof *qual, GFP_KERNEL);
 
 
 
3070	if (qual == NULL)
3071		return;
3072
3073	status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
3074			qual, sizeof *qual);
3075	if (status == sizeof *qual) {
3076		dev_info(&udev->dev, "not running at top speed; "
3077			"connect to a high speed hub\n");
3078		/* hub LEDs are probably harder to miss than syslog */
3079		if (hub->has_indicators) {
3080			hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
3081			schedule_delayed_work (&hub->leds, 0);
 
3082		}
3083	}
3084	kfree(qual);
3085}
3086
3087static unsigned
3088hub_power_remaining (struct usb_hub *hub)
3089{
3090	struct usb_device *hdev = hub->hdev;
3091	int remaining;
3092	int port1;
3093
3094	if (!hub->limited_power)
3095		return 0;
3096
3097	remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
3098	for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
3099		struct usb_device	*udev = hdev->children[port1 - 1];
3100		int			delta;
 
 
3101
3102		if (!udev)
3103			continue;
 
 
 
 
3104
3105		/* Unconfigured devices may not use more than 100mA,
3106		 * or 8mA for OTG ports */
 
 
3107		if (udev->actconfig)
3108			delta = udev->actconfig->desc.bMaxPower * 2;
3109		else if (port1 != udev->bus->otg_port || hdev->parent)
3110			delta = 100;
3111		else
3112			delta = 8;
3113		if (delta > hub->mA_per_port)
3114			dev_warn(&udev->dev,
3115				 "%dmA is over %umA budget for port %d!\n",
3116				 delta, hub->mA_per_port, port1);
3117		remaining -= delta;
3118	}
3119	if (remaining < 0) {
3120		dev_warn(hub->intfdev, "%dmA over power budget!\n",
3121			- remaining);
3122		remaining = 0;
3123	}
3124	return remaining;
3125}
3126
3127/* Handle physical or logical connection change events.
3128 * This routine is called when:
3129 * 	a port connection-change occurs;
3130 *	a port enable-change occurs (often caused by EMI);
3131 *	usb_reset_and_verify_device() encounters changed descriptors (as from
3132 *		a firmware download)
3133 * caller already locked the hub
3134 */
3135static void hub_port_connect_change(struct usb_hub *hub, int port1,
3136					u16 portstatus, u16 portchange)
3137{
3138	struct usb_device *hdev = hub->hdev;
3139	struct device *hub_dev = hub->intfdev;
3140	struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
3141	unsigned wHubCharacteristics =
3142			le16_to_cpu(hub->descriptor->wHubCharacteristics);
3143	struct usb_device *udev;
3144	int status, i;
3145
3146	dev_dbg (hub_dev,
3147		"port %d, status %04x, change %04x, %s\n",
3148		port1, portstatus, portchange, portspeed(hub, portstatus));
3149
3150	if (hub->has_indicators) {
3151		set_port_led(hub, port1, HUB_LED_AUTO);
3152		hub->indicator[port1-1] = INDICATOR_AUTO;
 
 
 
 
 
3153	}
3154
3155#ifdef	CONFIG_USB_OTG
3156	/* during HNP, don't repeat the debounce */
3157	if (hdev->bus->is_b_host)
3158		portchange &= ~(USB_PORT_STAT_C_CONNECTION |
3159				USB_PORT_STAT_C_ENABLE);
3160#endif
 
 
3161
3162	/* Try to resuscitate an existing device */
3163	udev = hdev->children[port1-1];
3164	if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&
3165			udev->state != USB_STATE_NOTATTACHED) {
3166		usb_lock_device(udev);
3167		if (portstatus & USB_PORT_STAT_ENABLE) {
3168			status = 0;		/* Nothing to do */
3169
3170#ifdef CONFIG_USB_SUSPEND
3171		} else if (udev->state == USB_STATE_SUSPENDED &&
3172				udev->persist_enabled) {
3173			/* For a suspended device, treat this as a
3174			 * remote wakeup event.
3175			 */
3176			status = usb_remote_wakeup(udev);
3177#endif
3178
3179		} else {
3180			status = -ENODEV;	/* Don't resuscitate */
 
 
 
 
 
 
 
3181		}
3182		usb_unlock_device(udev);
 
 
 
 
 
 
 
 
 
3183
3184		if (status == 0) {
3185			clear_bit(port1, hub->change_bits);
3186			return;
 
 
 
 
 
 
 
3187		}
3188	}
3189
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3190	/* Disconnect any existing devices under this port */
3191	if (udev)
3192		usb_disconnect(&hdev->children[port1-1]);
3193	clear_bit(port1, hub->change_bits);
 
 
3194
3195	/* We can forget about a "removed" device when there's a physical
3196	 * disconnect or the connect status changes.
3197	 */
3198	if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
3199			(portchange & USB_PORT_STAT_C_CONNECTION))
3200		clear_bit(port1, hub->removed_bits);
3201
3202	if (portchange & (USB_PORT_STAT_C_CONNECTION |
3203				USB_PORT_STAT_C_ENABLE)) {
3204		status = hub_port_debounce(hub, port1);
3205		if (status < 0) {
3206			if (printk_ratelimit())
3207				dev_err(hub_dev, "connect-debounce failed, "
3208						"port %d disabled\n", port1);
 
3209			portstatus &= ~USB_PORT_STAT_CONNECTION;
 
3210		} else {
3211			portstatus = status;
3212		}
3213	}
3214
3215	/* Return now if debouncing failed or nothing is connected or
3216	 * the device was "removed".
3217	 */
3218	if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
3219			test_bit(port1, hub->removed_bits)) {
3220
3221		/* maybe switch power back on (e.g. root hub was reset) */
3222		if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
3223				&& !port_is_power_on(hub, portstatus))
 
 
 
 
3224			set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
3225
3226		if (portstatus & USB_PORT_STAT_ENABLE)
3227  			goto done;
3228		return;
3229	}
 
 
 
 
 
 
3230
3231	for (i = 0; i < SET_CONFIG_TRIES; i++) {
 
 
 
 
3232
 
 
 
3233		/* reallocate for each attempt, since references
3234		 * to the previous one can escape in various ways
3235		 */
3236		udev = usb_alloc_dev(hdev, hdev->bus, port1);
3237		if (!udev) {
3238			dev_err (hub_dev,
3239				"couldn't allocate port %d usb_device\n",
3240				port1);
 
3241			goto done;
3242		}
3243
3244		usb_set_device_state(udev, USB_STATE_POWERED);
3245 		udev->bus_mA = hub->mA_per_port;
3246		udev->level = hdev->level + 1;
3247		udev->wusb = hub_is_wusb(hub);
3248
3249		/* Only USB 3.0 devices are connected to SuperSpeed hubs. */
3250		if (hub_is_superspeed(hub->hdev))
3251			udev->speed = USB_SPEED_SUPER;
3252		else
3253			udev->speed = USB_SPEED_UNKNOWN;
3254
3255		choose_devnum(udev);
3256		if (udev->devnum <= 0) {
3257			status = -ENOTCONN;	/* Don't retry */
3258			goto loop;
3259		}
3260
3261		/* reset (non-USB 3.0 devices) and get descriptor */
3262		status = hub_port_init(hub, udev, port1, i);
3263		if (status < 0)
3264			goto loop;
3265
3266		usb_detect_quirks(udev);
 
 
 
3267		if (udev->quirks & USB_QUIRK_DELAY_INIT)
3268			msleep(1000);
3269
3270		/* consecutive bus-powered hubs aren't reliable; they can
3271		 * violate the voltage drop budget.  if the new child has
3272		 * a "powered" LED, users should notice we didn't enable it
3273		 * (without reading syslog), even without per-port LEDs
3274		 * on the parent.
3275		 */
3276		if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
3277				&& udev->bus_mA <= 100) {
3278			u16	devstat;
3279
3280			status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
3281					&devstat);
3282			if (status < 2) {
3283				dev_dbg(&udev->dev, "get status %d ?\n", status);
3284				goto loop_disable;
3285			}
3286			le16_to_cpus(&devstat);
3287			if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
3288				dev_err(&udev->dev,
3289					"can't connect bus-powered hub "
3290					"to this port\n");
3291				if (hub->has_indicators) {
3292					hub->indicator[port1-1] =
3293						INDICATOR_AMBER_BLINK;
3294					schedule_delayed_work (&hub->leds, 0);
 
 
3295				}
3296				status = -ENOTCONN;	/* Don't retry */
3297				goto loop_disable;
3298			}
3299		}
3300 
3301		/* check for devices running slower than they could */
3302		if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
3303				&& udev->speed == USB_SPEED_FULL
3304				&& highspeed_hubs != 0)
3305			check_highspeed (hub, udev, port1);
3306
3307		/* Store the parent's children[] pointer.  At this point
3308		 * udev becomes globally accessible, although presumably
3309		 * no one will look at it until hdev is unlocked.
3310		 */
3311		status = 0;
3312
 
 
3313		/* We mustn't add new devices if the parent hub has
3314		 * been disconnected; we would race with the
3315		 * recursively_mark_NOTATTACHED() routine.
3316		 */
3317		spin_lock_irq(&device_state_lock);
3318		if (hdev->state == USB_STATE_NOTATTACHED)
3319			status = -ENOTCONN;
3320		else
3321			hdev->children[port1-1] = udev;
3322		spin_unlock_irq(&device_state_lock);
 
3323
3324		/* Run it through the hoops (find a driver, etc) */
3325		if (!status) {
3326			status = usb_new_device(udev);
3327			if (status) {
 
3328				spin_lock_irq(&device_state_lock);
3329				hdev->children[port1-1] = NULL;
3330				spin_unlock_irq(&device_state_lock);
 
 
 
 
 
3331			}
3332		}
3333
3334		if (status)
3335			goto loop_disable;
3336
3337		status = hub_power_remaining(hub);
3338		if (status)
3339			dev_dbg(hub_dev, "%dmA power budget left\n", status);
3340
3341		return;
3342
3343loop_disable:
3344		hub_port_disable(hub, port1, 1);
3345loop:
3346		usb_ep0_reinit(udev);
3347		release_devnum(udev);
3348		hub_free_dev(udev);
 
 
 
 
3349		usb_put_dev(udev);
3350		if ((status == -ENOTCONN) || (status == -ENOTSUPP))
3351			break;
 
 
 
 
 
 
 
 
 
3352	}
3353	if (hub->hdev->parent ||
3354			!hcd->driver->port_handed_over ||
3355			!(hcd->driver->port_handed_over)(hcd, port1))
3356		dev_err(hub_dev, "unable to enumerate USB device on port %d\n",
3357				port1);
3358 
 
 
3359done:
3360	hub_port_disable(hub, port1, 1);
3361	if (hcd->driver->relinquish_port && !hub->hdev->parent)
3362		hcd->driver->relinquish_port(hcd, port1);
 
 
3363}
3364
3365static void hub_events(void)
 
 
 
 
 
 
 
 
 
 
3366{
3367	struct list_head *tmp;
3368	struct usb_device *hdev;
3369	struct usb_interface *intf;
3370	struct usb_hub *hub;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3371	struct device *hub_dev;
3372	u16 hubstatus;
3373	u16 hubchange;
3374	u16 portstatus;
3375	u16 portchange;
3376	int i, ret;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3377	int connect_change;
 
 
 
 
 
3378
3379	/*
3380	 *  We restart the list every time to avoid a deadlock with
3381	 * deleting hubs downstream from this one. This should be
3382	 * safe since we delete the hub from the event list.
3383	 * Not the most efficient, but avoids deadlocks.
3384	 */
3385	while (1) {
3386
3387		/* Grab the first entry at the beginning of the list */
3388		spin_lock_irq(&hub_event_lock);
3389		if (list_empty(&hub_event_list)) {
3390			spin_unlock_irq(&hub_event_lock);
3391			break;
3392		}
3393
3394		tmp = hub_event_list.next;
3395		list_del_init(tmp);
3396
3397		hub = list_entry(tmp, struct usb_hub, event_list);
3398		kref_get(&hub->kref);
3399		spin_unlock_irq(&hub_event_lock);
3400
3401		hdev = hub->hdev;
3402		hub_dev = hub->intfdev;
3403		intf = to_usb_interface(hub_dev);
3404		dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
3405				hdev->state, hub->descriptor
3406					? hub->descriptor->bNbrPorts
3407					: 0,
3408				/* NOTE: expects max 15 ports... */
3409				(u16) hub->change_bits[0],
3410				(u16) hub->event_bits[0]);
3411
3412		/* Lock the device, then check to see if we were
3413		 * disconnected while waiting for the lock to succeed. */
3414		usb_lock_device(hdev);
3415		if (unlikely(hub->disconnected))
3416			goto loop_disconnected;
3417
3418		/* If the hub has died, clean up after it */
3419		if (hdev->state == USB_STATE_NOTATTACHED) {
3420			hub->error = -ENODEV;
3421			hub_quiesce(hub, HUB_DISCONNECT);
3422			goto loop;
3423		}
3424
3425		/* Autoresume */
3426		ret = usb_autopm_get_interface(intf);
3427		if (ret) {
3428			dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
3429			goto loop;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3430		}
 
3431
3432		/* If this is an inactive hub, do nothing */
3433		if (hub->quiescing)
3434			goto loop_autopm;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3435
3436		if (hub->error) {
3437			dev_dbg (hub_dev, "resetting for error %d\n",
3438				hub->error);
3439
3440			ret = usb_reset_device(hdev);
3441			if (ret) {
3442				dev_dbg (hub_dev,
3443					"error resetting hub: %d\n", ret);
3444				goto loop_autopm;
3445			}
3446
3447			hub->nerrors = 0;
3448			hub->error = 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3449		}
 
 
3450
3451		/* deal with port status changes */
3452		for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
3453			if (test_bit(i, hub->busy_bits))
3454				continue;
3455			connect_change = test_bit(i, hub->change_bits);
3456			if (!test_and_clear_bit(i, hub->event_bits) &&
3457					!connect_change)
3458				continue;
3459
3460			ret = hub_port_status(hub, i,
3461					&portstatus, &portchange);
3462			if (ret < 0)
3463				continue;
 
 
 
 
 
3464
3465			if (portchange & USB_PORT_STAT_C_CONNECTION) {
3466				clear_port_feature(hdev, i,
3467					USB_PORT_FEAT_C_CONNECTION);
3468				connect_change = 1;
3469			}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3470
3471			if (portchange & USB_PORT_STAT_C_ENABLE) {
3472				if (!connect_change)
3473					dev_dbg (hub_dev,
3474						"port %d enable change, "
3475						"status %08x\n",
3476						i, portstatus);
3477				clear_port_feature(hdev, i,
3478					USB_PORT_FEAT_C_ENABLE);
3479
3480				/*
3481				 * EM interference sometimes causes badly
3482				 * shielded USB devices to be shutdown by
3483				 * the hub, this hack enables them again.
3484				 * Works at least with mouse driver. 
3485				 */
3486				if (!(portstatus & USB_PORT_STAT_ENABLE)
3487				    && !connect_change
3488				    && hdev->children[i-1]) {
3489					dev_err (hub_dev,
3490					    "port %i "
3491					    "disabled by hub (EMI?), "
3492					    "re-enabling...\n",
3493						i);
3494					connect_change = 1;
3495				}
3496			}
3497
3498			if (portchange & USB_PORT_STAT_C_SUSPEND) {
3499				struct usb_device *udev;
3500
3501				clear_port_feature(hdev, i,
3502					USB_PORT_FEAT_C_SUSPEND);
3503				udev = hdev->children[i-1];
3504				if (udev) {
3505					/* TRSMRCY = 10 msec */
3506					msleep(10);
3507
3508					usb_lock_device(udev);
3509					ret = usb_remote_wakeup(hdev->
3510							children[i-1]);
3511					usb_unlock_device(udev);
3512					if (ret < 0)
3513						connect_change = 1;
3514				} else {
3515					ret = -ENODEV;
3516					hub_port_disable(hub, i, 1);
3517				}
3518				dev_dbg (hub_dev,
3519					"resume on port %d, status %d\n",
3520					i, ret);
3521			}
3522			
3523			if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
3524				u16 status = 0;
3525				u16 unused;
3526
3527				dev_dbg(hub_dev, "over-current change on port "
3528					"%d\n", i);
3529				clear_port_feature(hdev, i,
3530					USB_PORT_FEAT_C_OVER_CURRENT);
3531				msleep(100);	/* Cool down */
3532				hub_power_on(hub, true);
3533				hub_port_status(hub, i, &status, &unused);
3534				if (status & USB_PORT_STAT_OVERCURRENT)
3535					dev_err(hub_dev, "over-current "
3536						"condition on port %d\n", i);
3537			}
3538
3539			if (portchange & USB_PORT_STAT_C_RESET) {
3540				dev_dbg (hub_dev,
3541					"reset change on port %d\n",
3542					i);
3543				clear_port_feature(hdev, i,
3544					USB_PORT_FEAT_C_RESET);
3545			}
3546			if ((portchange & USB_PORT_STAT_C_BH_RESET) &&
3547					hub_is_superspeed(hub->hdev)) {
3548				dev_dbg(hub_dev,
3549					"warm reset change on port %d\n",
3550					i);
3551				clear_port_feature(hdev, i,
3552					USB_PORT_FEAT_C_BH_PORT_RESET);
3553			}
3554			if (portchange & USB_PORT_STAT_C_LINK_STATE) {
3555				clear_port_feature(hub->hdev, i,
3556						USB_PORT_FEAT_C_PORT_LINK_STATE);
3557			}
3558			if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) {
3559				dev_warn(hub_dev,
3560					"config error on port %d\n",
3561					i);
3562				clear_port_feature(hub->hdev, i,
3563						USB_PORT_FEAT_C_PORT_CONFIG_ERROR);
3564			}
3565
3566			/* Warm reset a USB3 protocol port if it's in
3567			 * SS.Inactive state.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3568			 */
3569			if (hub_is_superspeed(hub->hdev) &&
3570				(portstatus & USB_PORT_STAT_LINK_STATE)
3571					== USB_SS_PORT_LS_SS_INACTIVE) {
3572				dev_dbg(hub_dev, "warm reset port %d\n", i);
3573				hub_port_warm_reset(hub, i);
3574			}
3575
3576			if (connect_change)
3577				hub_port_connect_change(hub, i,
3578						portstatus, portchange);
3579		} /* end for i */
3580
3581		/* deal with hub status changes */
3582		if (test_and_clear_bit(0, hub->event_bits) == 0)
3583			;	/* do nothing */
3584		else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
3585			dev_err (hub_dev, "get_hub_status failed\n");
3586		else {
3587			if (hubchange & HUB_CHANGE_LOCAL_POWER) {
3588				dev_dbg (hub_dev, "power change\n");
3589				clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
3590				if (hubstatus & HUB_STATUS_LOCAL_POWER)
3591					/* FIXME: Is this always true? */
3592					hub->limited_power = 1;
3593				else
3594					hub->limited_power = 0;
3595			}
3596			if (hubchange & HUB_CHANGE_OVERCURRENT) {
3597				u16 status = 0;
3598				u16 unused;
3599
3600				dev_dbg(hub_dev, "over-current change\n");
3601				clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
3602				msleep(500);	/* Cool down */
3603                        	hub_power_on(hub, true);
3604				hub_hub_status(hub, &status, &unused);
3605				if (status & HUB_STATUS_OVERCURRENT)
3606					dev_err(hub_dev, "over-current "
3607						"condition\n");
3608			}
3609		}
 
3610
3611 loop_autopm:
3612		/* Balance the usb_autopm_get_interface() above */
3613		usb_autopm_put_interface_no_suspend(intf);
3614 loop:
3615		/* Balance the usb_autopm_get_interface_no_resume() in
3616		 * kick_khubd() and allow autosuspend.
3617		 */
3618		usb_autopm_put_interface(intf);
3619 loop_disconnected:
3620		usb_unlock_device(hdev);
3621		kref_put(&hub->kref, hub_release);
3622
3623        } /* end while (1) */
3624}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3625
3626static int hub_thread(void *__unused)
3627{
3628	/* khubd needs to be freezable to avoid intefering with USB-PERSIST
3629	 * port handover.  Otherwise it might see that a full-speed device
3630	 * was gone before the EHCI controller had handed its port over to
3631	 * the companion full-speed controller.
3632	 */
3633	set_freezable();
3634
3635	do {
3636		hub_events();
3637		wait_event_freezable(khubd_wait,
3638				!list_empty(&hub_event_list) ||
3639				kthread_should_stop());
3640	} while (!kthread_should_stop() || !list_empty(&hub_event_list));
3641
3642	pr_debug("%s: khubd exiting\n", usbcore_name);
3643	return 0;
3644}
3645
3646static const struct usb_device_id hub_id_table[] = {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3647    { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
3648      .bDeviceClass = USB_CLASS_HUB},
3649    { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
3650      .bInterfaceClass = USB_CLASS_HUB},
3651    { }						/* Terminating entry */
3652};
3653
3654MODULE_DEVICE_TABLE (usb, hub_id_table);
3655
3656static struct usb_driver hub_driver = {
3657	.name =		"hub",
3658	.probe =	hub_probe,
3659	.disconnect =	hub_disconnect,
3660	.suspend =	hub_suspend,
3661	.resume =	hub_resume,
3662	.reset_resume =	hub_reset_resume,
3663	.pre_reset =	hub_pre_reset,
3664	.post_reset =	hub_post_reset,
3665	.unlocked_ioctl = hub_ioctl,
3666	.id_table =	hub_id_table,
3667	.supports_autosuspend =	1,
3668};
3669
3670int usb_hub_init(void)
3671{
3672	if (usb_register(&hub_driver) < 0) {
3673		printk(KERN_ERR "%s: can't register hub driver\n",
3674			usbcore_name);
3675		return -1;
3676	}
3677
3678	khubd_task = kthread_run(hub_thread, NULL, "khubd");
3679	if (!IS_ERR(khubd_task))
 
 
 
 
 
 
3680		return 0;
3681
3682	/* Fall through if kernel_thread failed */
3683	usb_deregister(&hub_driver);
3684	printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
3685
3686	return -1;
3687}
3688
3689void usb_hub_cleanup(void)
3690{
3691	kthread_stop(khubd_task);
3692
3693	/*
3694	 * Hub resources are freed for us by usb_deregister. It calls
3695	 * usb_driver_purge on every device which in turn calls that
3696	 * devices disconnect function if it is using this driver.
3697	 * The hub_disconnect function takes care of releasing the
3698	 * individual hub resources. -greg
3699	 */
3700	usb_deregister(&hub_driver);
3701} /* usb_hub_cleanup() */
3702
3703static int descriptors_changed(struct usb_device *udev,
3704		struct usb_device_descriptor *old_device_descriptor)
3705{
3706	int		changed = 0;
3707	unsigned	index;
3708	unsigned	serial_len = 0;
3709	unsigned	len;
3710	unsigned	old_length;
3711	int		length;
3712	char		*buf;
3713
3714	if (memcmp(&udev->descriptor, old_device_descriptor,
3715			sizeof(*old_device_descriptor)) != 0)
3716		return 1;
3717
3718	/* Since the idVendor, idProduct, and bcdDevice values in the
3719	 * device descriptor haven't changed, we will assume the
3720	 * Manufacturer and Product strings haven't changed either.
3721	 * But the SerialNumber string could be different (e.g., a
3722	 * different flash card of the same brand).
3723	 */
3724	if (udev->serial)
3725		serial_len = strlen(udev->serial) + 1;
3726
3727	len = serial_len;
3728	for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
3729		old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
3730		len = max(len, old_length);
3731	}
3732
3733	buf = kmalloc(len, GFP_NOIO);
3734	if (buf == NULL) {
3735		dev_err(&udev->dev, "no mem to re-read configs after reset\n");
3736		/* assume the worst */
3737		return 1;
3738	}
3739	for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
3740		old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
3741		length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
3742				old_length);
3743		if (length != old_length) {
3744			dev_dbg(&udev->dev, "config index %d, error %d\n",
3745					index, length);
3746			changed = 1;
3747			break;
3748		}
3749		if (memcmp (buf, udev->rawdescriptors[index], old_length)
3750				!= 0) {
3751			dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
3752				index,
3753				((struct usb_config_descriptor *) buf)->
3754					bConfigurationValue);
3755			changed = 1;
3756			break;
3757		}
3758	}
3759
3760	if (!changed && serial_len) {
3761		length = usb_string(udev, udev->descriptor.iSerialNumber,
3762				buf, serial_len);
3763		if (length + 1 != serial_len) {
3764			dev_dbg(&udev->dev, "serial string error %d\n",
3765					length);
3766			changed = 1;
3767		} else if (memcmp(buf, udev->serial, length) != 0) {
3768			dev_dbg(&udev->dev, "serial string changed\n");
3769			changed = 1;
3770		}
3771	}
3772
3773	kfree(buf);
3774	return changed;
3775}
3776
3777/**
3778 * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
3779 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3780 *
3781 * WARNING - don't use this routine to reset a composite device
3782 * (one with multiple interfaces owned by separate drivers)!
3783 * Use usb_reset_device() instead.
3784 *
3785 * Do a port reset, reassign the device's address, and establish its
3786 * former operating configuration.  If the reset fails, or the device's
3787 * descriptors change from their values before the reset, or the original
3788 * configuration and altsettings cannot be restored, a flag will be set
3789 * telling khubd to pretend the device has been disconnected and then
3790 * re-connected.  All drivers will be unbound, and the device will be
3791 * re-enumerated and probed all over again.
3792 *
3793 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3794 * flagged for logical disconnection, or some other negative error code
3795 * if the reset wasn't even attempted.
3796 *
3797 * The caller must own the device lock.  For example, it's safe to use
3798 * this from a driver probe() routine after downloading new firmware.
3799 * For calls that might not occur during probe(), drivers should lock
3800 * the device using usb_lock_device_for_reset().
 
 
3801 *
3802 * Locking exception: This routine may also be called from within an
3803 * autoresume handler.  Such usage won't conflict with other tasks
3804 * holding the device lock because these tasks should always call
3805 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
 
 
3806 */
3807static int usb_reset_and_verify_device(struct usb_device *udev)
3808{
3809	struct usb_device		*parent_hdev = udev->parent;
3810	struct usb_hub			*parent_hub;
3811	struct usb_hcd			*hcd = bus_to_hcd(udev->bus);
3812	struct usb_device_descriptor	descriptor = udev->descriptor;
3813	int 				i, ret = 0;
 
3814	int				port1 = udev->portnum;
3815
3816	if (udev->state == USB_STATE_NOTATTACHED ||
3817			udev->state == USB_STATE_SUSPENDED) {
3818		dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3819				udev->state);
3820		return -EINVAL;
3821	}
3822
3823	if (!parent_hdev) {
3824		/* this requires hcd-specific logic; see ohci_restart() */
3825		dev_dbg(&udev->dev, "%s for root hub!\n", __func__);
3826		return -EISDIR;
3827	}
3828	parent_hub = hdev_to_hub(parent_hdev);
3829
3830	set_bit(port1, parent_hub->busy_bits);
3831	for (i = 0; i < SET_CONFIG_TRIES; ++i) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3832
3833		/* ep0 maxpacket size may change; let the HCD know about it.
3834		 * Other endpoints will be handled by re-enumeration. */
3835		usb_ep0_reinit(udev);
3836		ret = hub_port_init(parent_hub, udev, port1, i);
3837		if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
3838			break;
3839	}
3840	clear_bit(port1, parent_hub->busy_bits);
3841
3842	if (ret < 0)
3843		goto re_enumerate;
3844 
3845	/* Device might have changed firmware (DFU or similar) */
3846	if (descriptors_changed(udev, &descriptor)) {
3847		dev_info(&udev->dev, "device firmware changed\n");
3848		udev->descriptor = descriptor;	/* for disconnect() calls */
3849		goto re_enumerate;
3850  	}
3851
3852	/* Restore the device's previous configuration */
3853	if (!udev->actconfig)
3854		goto done;
3855
3856	mutex_lock(hcd->bandwidth_mutex);
3857	ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL);
3858	if (ret < 0) {
3859		dev_warn(&udev->dev,
3860				"Busted HC?  Not enough HCD resources for "
3861				"old configuration.\n");
3862		mutex_unlock(hcd->bandwidth_mutex);
3863		goto re_enumerate;
3864	}
3865	ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3866			USB_REQ_SET_CONFIGURATION, 0,
3867			udev->actconfig->desc.bConfigurationValue, 0,
3868			NULL, 0, USB_CTRL_SET_TIMEOUT);
3869	if (ret < 0) {
3870		dev_err(&udev->dev,
3871			"can't restore configuration #%d (error=%d)\n",
3872			udev->actconfig->desc.bConfigurationValue, ret);
3873		mutex_unlock(hcd->bandwidth_mutex);
3874		goto re_enumerate;
3875  	}
3876	mutex_unlock(hcd->bandwidth_mutex);
3877	usb_set_device_state(udev, USB_STATE_CONFIGURED);
3878
3879	/* Put interfaces back into the same altsettings as before.
3880	 * Don't bother to send the Set-Interface request for interfaces
3881	 * that were already in altsetting 0; besides being unnecessary,
3882	 * many devices can't handle it.  Instead just reset the host-side
3883	 * endpoint state.
3884	 */
3885	for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3886		struct usb_host_config *config = udev->actconfig;
3887		struct usb_interface *intf = config->interface[i];
3888		struct usb_interface_descriptor *desc;
3889
3890		desc = &intf->cur_altsetting->desc;
3891		if (desc->bAlternateSetting == 0) {
3892			usb_disable_interface(udev, intf, true);
3893			usb_enable_interface(udev, intf, true);
3894			ret = 0;
3895		} else {
3896			/* Let the bandwidth allocation function know that this
3897			 * device has been reset, and it will have to use
3898			 * alternate setting 0 as the current alternate setting.
3899			 */
3900			intf->resetting_device = 1;
3901			ret = usb_set_interface(udev, desc->bInterfaceNumber,
3902					desc->bAlternateSetting);
3903			intf->resetting_device = 0;
3904		}
3905		if (ret < 0) {
3906			dev_err(&udev->dev, "failed to restore interface %d "
3907				"altsetting %d (error=%d)\n",
3908				desc->bInterfaceNumber,
3909				desc->bAlternateSetting,
3910				ret);
3911			goto re_enumerate;
3912		}
 
 
 
3913	}
3914
3915done:
 
 
 
 
 
 
3916	return 0;
3917 
3918re_enumerate:
 
 
3919	hub_port_logical_disconnect(parent_hub, port1);
3920	return -ENODEV;
3921}
3922
3923/**
3924 * usb_reset_device - warn interface drivers and perform a USB port reset
3925 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3926 *
3927 * Warns all drivers bound to registered interfaces (using their pre_reset
3928 * method), performs the port reset, and then lets the drivers know that
3929 * the reset is over (using their post_reset method).
3930 *
3931 * Return value is the same as for usb_reset_and_verify_device().
 
 
 
 
 
3932 *
 
3933 * The caller must own the device lock.  For example, it's safe to use
3934 * this from a driver probe() routine after downloading new firmware.
3935 * For calls that might not occur during probe(), drivers should lock
3936 * the device using usb_lock_device_for_reset().
3937 *
3938 * If an interface is currently being probed or disconnected, we assume
3939 * its driver knows how to handle resets.  For all other interfaces,
3940 * if the driver doesn't have pre_reset and post_reset methods then
3941 * we attempt to unbind it and rebind afterward.
3942 */
3943int usb_reset_device(struct usb_device *udev)
3944{
3945	int ret;
3946	int i;
 
 
3947	struct usb_host_config *config = udev->actconfig;
 
3948
3949	if (udev->state == USB_STATE_NOTATTACHED ||
3950			udev->state == USB_STATE_SUSPENDED) {
3951		dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3952				udev->state);
3953		return -EINVAL;
3954	}
3955
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3956	/* Prevent autosuspend during the reset */
3957	usb_autoresume_device(udev);
3958
3959	if (config) {
3960		for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3961			struct usb_interface *cintf = config->interface[i];
3962			struct usb_driver *drv;
3963			int unbind = 0;
3964
3965			if (cintf->dev.driver) {
3966				drv = to_usb_driver(cintf->dev.driver);
3967				if (drv->pre_reset && drv->post_reset)
3968					unbind = (drv->pre_reset)(cintf);
3969				else if (cintf->condition ==
3970						USB_INTERFACE_BOUND)
3971					unbind = 1;
3972				if (unbind)
3973					usb_forced_unbind_intf(cintf);
3974			}
3975		}
3976	}
3977
 
3978	ret = usb_reset_and_verify_device(udev);
 
3979
3980	if (config) {
3981		for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3982			struct usb_interface *cintf = config->interface[i];
3983			struct usb_driver *drv;
3984			int rebind = cintf->needs_binding;
3985
3986			if (!rebind && cintf->dev.driver) {
3987				drv = to_usb_driver(cintf->dev.driver);
3988				if (drv->post_reset)
3989					rebind = (drv->post_reset)(cintf);
3990				else if (cintf->condition ==
3991						USB_INTERFACE_BOUND)
3992					rebind = 1;
 
 
3993			}
3994			if (ret == 0 && rebind)
3995				usb_rebind_intf(cintf);
3996		}
 
 
 
 
3997	}
3998
3999	usb_autosuspend_device(udev);
 
 
4000	return ret;
4001}
4002EXPORT_SYMBOL_GPL(usb_reset_device);
4003
4004
4005/**
4006 * usb_queue_reset_device - Reset a USB device from an atomic context
4007 * @iface: USB interface belonging to the device to reset
4008 *
4009 * This function can be used to reset a USB device from an atomic
4010 * context, where usb_reset_device() won't work (as it blocks).
4011 *
4012 * Doing a reset via this method is functionally equivalent to calling
4013 * usb_reset_device(), except for the fact that it is delayed to a
4014 * workqueue. This means that any drivers bound to other interfaces
4015 * might be unbound, as well as users from usbfs in user space.
4016 *
4017 * Corner cases:
4018 *
4019 * - Scheduling two resets at the same time from two different drivers
4020 *   attached to two different interfaces of the same device is
4021 *   possible; depending on how the driver attached to each interface
4022 *   handles ->pre_reset(), the second reset might happen or not.
4023 *
4024 * - If a driver is unbound and it had a pending reset, the reset will
4025 *   be cancelled.
4026 *
4027 * - This function can be called during .probe() or .disconnect()
4028 *   times. On return from .disconnect(), any pending resets will be
4029 *   cancelled.
4030 *
4031 * There is no no need to lock/unlock the @reset_ws as schedule_work()
4032 * does its own.
4033 *
4034 * NOTE: We don't do any reference count tracking because it is not
4035 *     needed. The lifecycle of the work_struct is tied to the
4036 *     usb_interface. Before destroying the interface we cancel the
4037 *     work_struct, so the fact that work_struct is queued and or
4038 *     running means the interface (and thus, the device) exist and
4039 *     are referenced.
4040 */
4041void usb_queue_reset_device(struct usb_interface *iface)
4042{
4043	schedule_work(&iface->reset_ws);
 
4044}
4045EXPORT_SYMBOL_GPL(usb_queue_reset_device);