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USB hub: simplify remote-wakeup handling
[deliverable/linux.git] / drivers / usb / core / hub.c
CommitLineData
1da177e4
LT		 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
1da177e4
LT		 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/smp_lock.h>
20#include <linux/ioctl.h>
21#include <linux/usb.h>
22#include <linux/usbdevice_fs.h>
9c8d6178 23#include <linux/kthread.h>
4186ecf8 24#include <linux/mutex.h>
1da177e4
LT		 25
26#include <asm/semaphore.h>
27#include <asm/uaccess.h>
28#include <asm/byteorder.h>
29
30#include "usb.h"
31#include "hcd.h"
32#include "hub.h"
33
1bb5f66b
AS		 34struct usb_hub {
35 struct device *intfdev; /* the "interface" device */
36 struct usb_device *hdev;
37 struct urb *urb; /* for interrupt polling pipe */
38
39 /* buffer for urb ... with extra space in case of babble */
40 char (*buffer)[8];
41 dma_addr_t buffer_dma; /* DMA address for buffer */
42 union {
43 struct usb_hub_status hub;
44 struct usb_port_status port;
45 } *status; /* buffer for status reports */
46
47 int error; /* last reported error */
48 int nerrors; /* track consecutive errors */
49
50 struct list_head event_list; /* hubs w/data or errs ready */
51 unsigned long event_bits[1]; /* status change bitmask */
52 unsigned long change_bits[1]; /* ports with logical connect
53 status change */
54 unsigned long busy_bits[1]; /* ports being reset or
55 resumed */
56#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
57#error event_bits[] is too short!
58#endif
59
60 struct usb_hub_descriptor *descriptor; /* class descriptor */
61 struct usb_tt tt; /* Transaction Translator */
62
63 unsigned mA_per_port; /* current for each child */
64
65 unsigned limited_power:1;
66 unsigned quiescing:1;
67 unsigned activating:1;
1bb5f66b
AS		 68
69 unsigned has_indicators:1;
70 u8 indicator[USB_MAXCHILDREN];
71 struct work_struct leds;
72};
73
74
1da177e4 75/* Protect struct usb_device->state and ->children members
9ad3d6cc 76 * Note: Both are also protected by ->dev.sem, except that ->state can
1da177e4
LT		 77 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
78static DEFINE_SPINLOCK(device_state_lock);
79
80/* khubd's worklist and its lock */
81static DEFINE_SPINLOCK(hub_event_lock);
82static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
83
84/* Wakes up khubd */
85static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
86
9c8d6178 87static struct task_struct *khubd_task;
1da177e4 88
c066475e
GKH		 89/* multithreaded probe logic */
90static int multithread_probe =
91#ifdef CONFIG_USB_MULTITHREAD_PROBE
92 1;
93#else
94 0;
95#endif
96module_param(multithread_probe, bool, S_IRUGO);
97MODULE_PARM_DESC(multithread_probe, "Run each USB device probe in a new thread");
98
1da177e4
LT		 99/* cycle leds on hubs that aren't blinking for attention */
100static int blinkenlights = 0;
101module_param (blinkenlights, bool, S_IRUGO);
102MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
103
104/*
105 * As of 2.6.10 we introduce a new USB device initialization scheme which
106 * closely resembles the way Windows works. Hopefully it will be compatible
107 * with a wider range of devices than the old scheme. However some previously
108 * working devices may start giving rise to "device not accepting address"
109 * errors; if that happens the user can try the old scheme by adjusting the
110 * following module parameters.
111 *
112 * For maximum flexibility there are two boolean parameters to control the
113 * hub driver's behavior. On the first initialization attempt, if the
114 * "old_scheme_first" parameter is set then the old scheme will be used,
115 * otherwise the new scheme is used. If that fails and "use_both_schemes"
116 * is set, then the driver will make another attempt, using the other scheme.
117 */
118static int old_scheme_first = 0;
119module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
120MODULE_PARM_DESC(old_scheme_first,
121 "start with the old device initialization scheme");
122
123static int use_both_schemes = 1;
124module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
125MODULE_PARM_DESC(use_both_schemes,
126 "try the other device initialization scheme if the "
127 "first one fails");
128
129
130#ifdef DEBUG
131static inline char *portspeed (int portstatus)
132{
133 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
134 return "480 Mb/s";
135 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
136 return "1.5 Mb/s";
137 else
138 return "12 Mb/s";
139}
140#endif
141
142/* Note that hdev or one of its children must be locked! */
143static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
144{
145 return usb_get_intfdata(hdev->actconfig->interface[0]);
146}
147
148/* USB 2.0 spec Section 11.24.4.5 */
149static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
150{
151 int i, ret;
152
153 for (i = 0; i < 3; i++) {
154 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
155 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
156 USB_DT_HUB << 8, 0, data, size,
157 USB_CTRL_GET_TIMEOUT);
158 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
159 return ret;
160 }
161 return -EINVAL;
162}
163
164/*
165 * USB 2.0 spec Section 11.24.2.1
166 */
167static int clear_hub_feature(struct usb_device *hdev, int feature)
168{
169 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
170 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
171}
172
173/*
174 * USB 2.0 spec Section 11.24.2.2
175 */
176static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
177{
178 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
179 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
180 NULL, 0, 1000);
181}
182
183/*
184 * USB 2.0 spec Section 11.24.2.13
185 */
186static int set_port_feature(struct usb_device *hdev, int port1, int feature)
187{
188 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
189 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
190 NULL, 0, 1000);
191}
192
193/*
194 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
195 * for info about using port indicators
196 */
197static void set_port_led(
198 struct usb_hub *hub,
199 int port1,
200 int selector
201)
202{
203 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
204 USB_PORT_FEAT_INDICATOR);
205 if (status < 0)
206 dev_dbg (hub->intfdev,
207 "port %d indicator %s status %d\n",
208 port1,
209 ({ char *s; switch (selector) {
210 case HUB_LED_AMBER: s = "amber"; break;
211 case HUB_LED_GREEN: s = "green"; break;
212 case HUB_LED_OFF: s = "off"; break;
213 case HUB_LED_AUTO: s = "auto"; break;
214 default: s = "??"; break;
215 }; s; }),
216 status);
217}
218
219#define LED_CYCLE_PERIOD ((2*HZ)/3)
220
221static void led_work (void *__hub)
222{
223 struct usb_hub *hub = __hub;
224 struct usb_device *hdev = hub->hdev;
225 unsigned i;
226 unsigned changed = 0;
227 int cursor = -1;
228
229 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
230 return;
231
232 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
233 unsigned selector, mode;
234
235 /* 30%-50% duty cycle */
236
237 switch (hub->indicator[i]) {
238 /* cycle marker */
239 case INDICATOR_CYCLE:
240 cursor = i;
241 selector = HUB_LED_AUTO;
242 mode = INDICATOR_AUTO;
243 break;
244 /* blinking green = sw attention */
245 case INDICATOR_GREEN_BLINK:
246 selector = HUB_LED_GREEN;
247 mode = INDICATOR_GREEN_BLINK_OFF;
248 break;
249 case INDICATOR_GREEN_BLINK_OFF:
250 selector = HUB_LED_OFF;
251 mode = INDICATOR_GREEN_BLINK;
252 break;
253 /* blinking amber = hw attention */
254 case INDICATOR_AMBER_BLINK:
255 selector = HUB_LED_AMBER;
256 mode = INDICATOR_AMBER_BLINK_OFF;
257 break;
258 case INDICATOR_AMBER_BLINK_OFF:
259 selector = HUB_LED_OFF;
260 mode = INDICATOR_AMBER_BLINK;
261 break;
262 /* blink green/amber = reserved */
263 case INDICATOR_ALT_BLINK:
264 selector = HUB_LED_GREEN;
265 mode = INDICATOR_ALT_BLINK_OFF;
266 break;
267 case INDICATOR_ALT_BLINK_OFF:
268 selector = HUB_LED_AMBER;
269 mode = INDICATOR_ALT_BLINK;
270 break;
271 default:
272 continue;
273 }
274 if (selector != HUB_LED_AUTO)
275 changed = 1;
276 set_port_led(hub, i + 1, selector);
277 hub->indicator[i] = mode;
278 }
279 if (!changed && blinkenlights) {
280 cursor++;
281 cursor %= hub->descriptor->bNbrPorts;
282 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
283 hub->indicator[cursor] = INDICATOR_CYCLE;
284 changed++;
285 }
286 if (changed)
287 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
288}
289
290/* use a short timeout for hub/port status fetches */
291#define USB_STS_TIMEOUT 1000
292#define USB_STS_RETRIES 5
293
294/*
295 * USB 2.0 spec Section 11.24.2.6
296 */
297static int get_hub_status(struct usb_device *hdev,
298 struct usb_hub_status *data)
299{
300 int i, status = -ETIMEDOUT;
301
302 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
303 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
304 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
305 data, sizeof(*data), USB_STS_TIMEOUT);
306 }
307 return status;
308}
309
310/*
311 * USB 2.0 spec Section 11.24.2.7
312 */
313static int get_port_status(struct usb_device *hdev, int port1,
314 struct usb_port_status *data)
315{
316 int i, status = -ETIMEDOUT;
317
318 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
319 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
320 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
321 data, sizeof(*data), USB_STS_TIMEOUT);
322 }
323 return status;
324}
325
326static void kick_khubd(struct usb_hub *hub)
327{
328 unsigned long flags;
329
40f122f3
AS		 330 /* Suppress autosuspend until khubd runs */
331 to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
332
1da177e4
LT		 333 spin_lock_irqsave(&hub_event_lock, flags);
334 if (list_empty(&hub->event_list)) {
335 list_add_tail(&hub->event_list, &hub_event_list);
336 wake_up(&khubd_wait);
337 }
338 spin_unlock_irqrestore(&hub_event_lock, flags);
339}
340
341void usb_kick_khubd(struct usb_device *hdev)
342{
343 kick_khubd(hdev_to_hub(hdev));
344}
345
346
347/* completion function, fires on port status changes and various faults */
7d12e780 348static void hub_irq(struct urb *urb)
1da177e4 349{
ec17cf1c 350 struct usb_hub *hub = urb->context;
1da177e4
LT		 351 int status;
352 int i;
353 unsigned long bits;
354
355 switch (urb->status) {
356 case -ENOENT: /* synchronous unlink */
357 case -ECONNRESET: /* async unlink */
358 case -ESHUTDOWN: /* hardware going away */
359 return;
360
361 default: /* presumably an error */
362 /* Cause a hub reset after 10 consecutive errors */
363 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
364 if ((++hub->nerrors < 10) || hub->error)
365 goto resubmit;
366 hub->error = urb->status;
367 /* FALL THROUGH */
ec17cf1c 368
1da177e4
LT		 369 /* let khubd handle things */
370 case 0: /* we got data: port status changed */
371 bits = 0;
372 for (i = 0; i < urb->actual_length; ++i)
373 bits |= ((unsigned long) ((*hub->buffer)[i]))
374 << (i*8);
375 hub->event_bits[0] = bits;
376 break;
377 }
378
379 hub->nerrors = 0;
380
381 /* Something happened, let khubd figure it out */
382 kick_khubd(hub);
383
384resubmit:
385 if (hub->quiescing)
386 return;
387
388 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
389 && status != -ENODEV && status != -EPERM)
390 dev_err (hub->intfdev, "resubmit --> %d\n", status);
391}
392
393/* USB 2.0 spec Section 11.24.2.3 */
394static inline int
395hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
396{
397 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
398 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
399 tt, NULL, 0, 1000);
400}
401
402/*
403 * enumeration blocks khubd for a long time. we use keventd instead, since
404 * long blocking there is the exception, not the rule. accordingly, HCDs
405 * talking to TTs must queue control transfers (not just bulk and iso), so
406 * both can talk to the same hub concurrently.
407 */
408static void hub_tt_kevent (void *arg)
409{
410 struct usb_hub *hub = arg;
411 unsigned long flags;
412
413 spin_lock_irqsave (&hub->tt.lock, flags);
414 while (!list_empty (&hub->tt.clear_list)) {
415 struct list_head *temp;
416 struct usb_tt_clear *clear;
417 struct usb_device *hdev = hub->hdev;
418 int status;
419
420 temp = hub->tt.clear_list.next;
421 clear = list_entry (temp, struct usb_tt_clear, clear_list);
422 list_del (&clear->clear_list);
423
424 /* drop lock so HCD can concurrently report other TT errors */
425 spin_unlock_irqrestore (&hub->tt.lock, flags);
426 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
427 spin_lock_irqsave (&hub->tt.lock, flags);
428
429 if (status)
430 dev_err (&hdev->dev,
431 "clear tt %d (%04x) error %d\n",
432 clear->tt, clear->devinfo, status);
1bc3c9e1 433 kfree(clear);
1da177e4
LT		 434 }
435 spin_unlock_irqrestore (&hub->tt.lock, flags);
436}
437
438/**
439 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
440 * @udev: the device whose split transaction failed
441 * @pipe: identifies the endpoint of the failed transaction
442 *
443 * High speed HCDs use this to tell the hub driver that some split control or
444 * bulk transaction failed in a way that requires clearing internal state of
445 * a transaction translator. This is normally detected (and reported) from
446 * interrupt context.
447 *
448 * It may not be possible for that hub to handle additional full (or low)
449 * speed transactions until that state is fully cleared out.
450 */
451void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
452{
453 struct usb_tt *tt = udev->tt;
454 unsigned long flags;
455 struct usb_tt_clear *clear;
456
457 /* we've got to cope with an arbitrary number of pending TT clears,
458 * since each TT has "at least two" buffers that can need it (and
459 * there can be many TTs per hub). even if they're uncommon.
460 */
461 if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) {
462 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
463 /* FIXME recover somehow ... RESET_TT? */
464 return;
465 }
466
467 /* info that CLEAR_TT_BUFFER needs */
468 clear->tt = tt->multi ? udev->ttport : 1;
469 clear->devinfo = usb_pipeendpoint (pipe);
470 clear->devinfo |= udev->devnum << 4;
471 clear->devinfo |= usb_pipecontrol (pipe)
472 ? (USB_ENDPOINT_XFER_CONTROL << 11)
473 : (USB_ENDPOINT_XFER_BULK << 11);
474 if (usb_pipein (pipe))
475 clear->devinfo |= 1 << 15;
476
477 /* tell keventd to clear state for this TT */
478 spin_lock_irqsave (&tt->lock, flags);
479 list_add_tail (&clear->clear_list, &tt->clear_list);
480 schedule_work (&tt->kevent);
481 spin_unlock_irqrestore (&tt->lock, flags);
482}
483
484static void hub_power_on(struct usb_hub *hub)
485{
486 int port1;
b789696a 487 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
4489a571
AS		 488 u16 wHubCharacteristics =
489 le16_to_cpu(hub->descriptor->wHubCharacteristics);
490
491 /* Enable power on each port. Some hubs have reserved values
492 * of LPSM (> 2) in their descriptors, even though they are
493 * USB 2.0 hubs. Some hubs do not implement port-power switching
494 * but only emulate it. In all cases, the ports won't work
495 * unless we send these messages to the hub.
496 */
497 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
1da177e4 498 dev_dbg(hub->intfdev, "enabling power on all ports\n");
4489a571
AS		 499 else
500 dev_dbg(hub->intfdev, "trying to enable port power on "
501 "non-switchable hub\n");
502 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
503 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
1da177e4 504
b789696a
DB		 505 /* Wait at least 100 msec for power to become stable */
506 msleep(max(pgood_delay, (unsigned) 100));
1da177e4
LT		 507}
508
02c399ee 509static void hub_quiesce(struct usb_hub *hub)
1da177e4 510{
979d5199 511 /* (nonblocking) khubd and related activity won't re-trigger */
1da177e4 512 hub->quiescing = 1;
c9f89fa4 513 hub->activating = 0;
979d5199 514
979d5199 515 /* (blocking) stop khubd and related activity */
1da177e4
LT		 516 usb_kill_urb(hub->urb);
517 if (hub->has_indicators)
518 cancel_delayed_work(&hub->leds);
519 if (hub->has_indicators || hub->tt.hub)
520 flush_scheduled_work();
521}
522
523static void hub_activate(struct usb_hub *hub)
524{
525 int status;
526
527 hub->quiescing = 0;
528 hub->activating = 1;
40f122f3 529
1da177e4
LT		 530 status = usb_submit_urb(hub->urb, GFP_NOIO);
531 if (status < 0)
532 dev_err(hub->intfdev, "activate --> %d\n", status);
533 if (hub->has_indicators && blinkenlights)
534 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
535
536 /* scan all ports ASAP */
537 kick_khubd(hub);
538}
539
540static int hub_hub_status(struct usb_hub *hub,
541 u16 *status, u16 *change)
542{
543 int ret;
544
545 ret = get_hub_status(hub->hdev, &hub->status->hub);
546 if (ret < 0)
547 dev_err (hub->intfdev,
548 "%s failed (err = %d)\n", __FUNCTION__, ret);
549 else {
550 *status = le16_to_cpu(hub->status->hub.wHubStatus);
551 *change = le16_to_cpu(hub->status->hub.wHubChange);
552 ret = 0;
553 }
554 return ret;
555}
556
8b28c752
AS		 557static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
558{
559 struct usb_device *hdev = hub->hdev;
560 int ret;
561
562 if (hdev->children[port1-1] && set_state) {
563 usb_set_device_state(hdev->children[port1-1],
564 USB_STATE_NOTATTACHED);
565 }
566 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
567 if (ret)
568 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
569 port1, ret);
570
571 return ret;
572}
573
7d069b7d
AS		 574
575/* caller has locked the hub device */
7de18d8b 576static void hub_pre_reset(struct usb_interface *intf)
7d069b7d 577{
7de18d8b 578 struct usb_hub *hub = usb_get_intfdata(intf);
7d069b7d
AS		 579 struct usb_device *hdev = hub->hdev;
580 int port1;
581
582 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
583 if (hdev->children[port1 - 1]) {
584 usb_disconnect(&hdev->children[port1 - 1]);
7de18d8b 585 if (hub->error == 0)
7d069b7d
AS		 586 hub_port_disable(hub, port1, 0);
587 }
588 }
589 hub_quiesce(hub);
590}
591
592/* caller has locked the hub device */
7de18d8b 593static void hub_post_reset(struct usb_interface *intf)
7d069b7d 594{
7de18d8b
AS		 595 struct usb_hub *hub = usb_get_intfdata(intf);
596
7d069b7d
AS		 597 hub_activate(hub);
598 hub_power_on(hub);
599}
600
601
1da177e4
LT		 602static int hub_configure(struct usb_hub *hub,
603 struct usb_endpoint_descriptor *endpoint)
604{
605 struct usb_device *hdev = hub->hdev;
606 struct device *hub_dev = hub->intfdev;
607 u16 hubstatus, hubchange;
74ad9bd2 608 u16 wHubCharacteristics;
1da177e4
LT		 609 unsigned int pipe;
610 int maxp, ret;
611 char *message;
612
613 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
614 &hub->buffer_dma);
615 if (!hub->buffer) {
616 message = "can't allocate hub irq buffer";
617 ret = -ENOMEM;
618 goto fail;
619 }
620
621 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
622 if (!hub->status) {
623 message = "can't kmalloc hub status buffer";
624 ret = -ENOMEM;
625 goto fail;
626 }
627
628 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
629 if (!hub->descriptor) {
630 message = "can't kmalloc hub descriptor";
631 ret = -ENOMEM;
632 goto fail;
633 }
634
635 /* Request the entire hub descriptor.
636 * hub->descriptor can handle USB_MAXCHILDREN ports,
637 * but the hub can/will return fewer bytes here.
638 */
639 ret = get_hub_descriptor(hdev, hub->descriptor,
640 sizeof(*hub->descriptor));
641 if (ret < 0) {
642 message = "can't read hub descriptor";
643 goto fail;
644 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
645 message = "hub has too many ports!";
646 ret = -ENODEV;
647 goto fail;
648 }
649
650 hdev->maxchild = hub->descriptor->bNbrPorts;
651 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
652 (hdev->maxchild == 1) ? "" : "s");
653
74ad9bd2 654 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4 655
74ad9bd2 656 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
1da177e4
LT		 657 int i;
658 char portstr [USB_MAXCHILDREN + 1];
659
660 for (i = 0; i < hdev->maxchild; i++)
661 portstr[i] = hub->descriptor->DeviceRemovable
662 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
663 ? 'F' : 'R';
664 portstr[hdev->maxchild] = 0;
665 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
666 } else
667 dev_dbg(hub_dev, "standalone hub\n");
668
74ad9bd2 669 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1da177e4
LT		 670 case 0x00:
671 dev_dbg(hub_dev, "ganged power switching\n");
672 break;
673 case 0x01:
674 dev_dbg(hub_dev, "individual port power switching\n");
675 break;
676 case 0x02:
677 case 0x03:
678 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
679 break;
680 }
681
74ad9bd2 682 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1da177e4
LT		 683 case 0x00:
684 dev_dbg(hub_dev, "global over-current protection\n");
685 break;
686 case 0x08:
687 dev_dbg(hub_dev, "individual port over-current protection\n");
688 break;
689 case 0x10:
690 case 0x18:
691 dev_dbg(hub_dev, "no over-current protection\n");
692 break;
693 }
694
695 spin_lock_init (&hub->tt.lock);
696 INIT_LIST_HEAD (&hub->tt.clear_list);
697 INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
698 switch (hdev->descriptor.bDeviceProtocol) {
699 case 0:
700 break;
701 case 1:
702 dev_dbg(hub_dev, "Single TT\n");
703 hub->tt.hub = hdev;
704 break;
705 case 2:
706 ret = usb_set_interface(hdev, 0, 1);
707 if (ret == 0) {
708 dev_dbg(hub_dev, "TT per port\n");
709 hub->tt.multi = 1;
710 } else
711 dev_err(hub_dev, "Using single TT (err %d)\n",
712 ret);
713 hub->tt.hub = hdev;
714 break;
715 default:
716 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
717 hdev->descriptor.bDeviceProtocol);
718 break;
719 }
720
e09711ae 721 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
74ad9bd2 722 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
e09711ae 723 case HUB_TTTT_8_BITS:
724 if (hdev->descriptor.bDeviceProtocol != 0) {
725 hub->tt.think_time = 666;
726 dev_dbg(hub_dev, "TT requires at most %d "
727 "FS bit times (%d ns)\n",
728 8, hub->tt.think_time);
729 }
1da177e4 730 break;
e09711ae 731 case HUB_TTTT_16_BITS:
732 hub->tt.think_time = 666 * 2;
733 dev_dbg(hub_dev, "TT requires at most %d "
734 "FS bit times (%d ns)\n",
735 16, hub->tt.think_time);
1da177e4 736 break;
e09711ae 737 case HUB_TTTT_24_BITS:
738 hub->tt.think_time = 666 * 3;
739 dev_dbg(hub_dev, "TT requires at most %d "
740 "FS bit times (%d ns)\n",
741 24, hub->tt.think_time);
1da177e4 742 break;
e09711ae 743 case HUB_TTTT_32_BITS:
744 hub->tt.think_time = 666 * 4;
745 dev_dbg(hub_dev, "TT requires at most %d "
746 "FS bit times (%d ns)\n",
747 32, hub->tt.think_time);
1da177e4
LT		 748 break;
749 }
750
751 /* probe() zeroes hub->indicator[] */
74ad9bd2 752 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1da177e4
LT		 753 hub->has_indicators = 1;
754 dev_dbg(hub_dev, "Port indicators are supported\n");
755 }
756
757 dev_dbg(hub_dev, "power on to power good time: %dms\n",
758 hub->descriptor->bPwrOn2PwrGood * 2);
759
760 /* power budgeting mostly matters with bus-powered hubs,
761 * and battery-powered root hubs (may provide just 8 mA).
762 */
763 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
55c52718 764 if (ret < 2) {
1da177e4
LT		 765 message = "can't get hub status";
766 goto fail;
767 }
7d35b929
AS		 768 le16_to_cpus(&hubstatus);
769 if (hdev == hdev->bus->root_hub) {
55c52718
AS		 770 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
771 hub->mA_per_port = 500;
772 else {
773 hub->mA_per_port = hdev->bus_mA;
774 hub->limited_power = 1;
775 }
7d35b929 776 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1da177e4
LT		 777 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
778 hub->descriptor->bHubContrCurrent);
55c52718
AS		 779 hub->limited_power = 1;
780 if (hdev->maxchild > 0) {
781 int remaining = hdev->bus_mA -
782 hub->descriptor->bHubContrCurrent;
783
784 if (remaining < hdev->maxchild * 100)
785 dev_warn(hub_dev,
786 "insufficient power available "
787 "to use all downstream ports\n");
788 hub->mA_per_port = 100; /* 7.2.1.1 */
789 }
790 } else { /* Self-powered external hub */
791 /* FIXME: What about battery-powered external hubs that
792 * provide less current per port? */
793 hub->mA_per_port = 500;
7d35b929 794 }
55c52718
AS		 795 if (hub->mA_per_port < 500)
796 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
797 hub->mA_per_port);
1da177e4
LT		 798
799 ret = hub_hub_status(hub, &hubstatus, &hubchange);
800 if (ret < 0) {
801 message = "can't get hub status";
802 goto fail;
803 }
804
805 /* local power status reports aren't always correct */
806 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
807 dev_dbg(hub_dev, "local power source is %s\n",
808 (hubstatus & HUB_STATUS_LOCAL_POWER)
809 ? "lost (inactive)" : "good");
810
74ad9bd2 811 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1da177e4
LT		 812 dev_dbg(hub_dev, "%sover-current condition exists\n",
813 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
814
88fafff9 815 /* set up the interrupt endpoint
816 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
817 * bytes as USB2.0[11.12.3] says because some hubs are known
818 * to send more data (and thus cause overflow). For root hubs,
819 * maxpktsize is defined in hcd.c's fake endpoint descriptors
820 * to be big enough for at least USB_MAXCHILDREN ports. */
1da177e4
LT		 821 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
822 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
823
824 if (maxp > sizeof(*hub->buffer))
825 maxp = sizeof(*hub->buffer);
826
827 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
828 if (!hub->urb) {
829 message = "couldn't allocate interrupt urb";
830 ret = -ENOMEM;
831 goto fail;
832 }
833
834 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
835 hub, endpoint->bInterval);
836 hub->urb->transfer_dma = hub->buffer_dma;
837 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
838
839 /* maybe cycle the hub leds */
840 if (hub->has_indicators && blinkenlights)
841 hub->indicator [0] = INDICATOR_CYCLE;
842
843 hub_power_on(hub);
844 hub_activate(hub);
845 return 0;
846
847fail:
848 dev_err (hub_dev, "config failed, %s (err %d)\n",
849 message, ret);
850 /* hub_disconnect() frees urb and descriptor */
851 return ret;
852}
853
854static unsigned highspeed_hubs;
855
856static void hub_disconnect(struct usb_interface *intf)
857{
858 struct usb_hub *hub = usb_get_intfdata (intf);
859 struct usb_device *hdev;
860
7de18d8b
AS		 861 /* Disconnect all children and quiesce the hub */
862 hub->error = 0;
863 hub_pre_reset(intf);
864
8b28c752 865 usb_set_intfdata (intf, NULL);
1da177e4
LT		 866 hdev = hub->hdev;
867
868 if (hdev->speed == USB_SPEED_HIGH)
869 highspeed_hubs--;
870
1da177e4
LT		 871 usb_free_urb(hub->urb);
872 hub->urb = NULL;
873
874 spin_lock_irq(&hub_event_lock);
875 list_del_init(&hub->event_list);
876 spin_unlock_irq(&hub_event_lock);
877
1bc3c9e1
JJ		 878 kfree(hub->descriptor);
879 hub->descriptor = NULL;
1da177e4 880
1bc3c9e1
JJ		 881 kfree(hub->status);
882 hub->status = NULL;
1da177e4
LT		 883
884 if (hub->buffer) {
885 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
886 hub->buffer_dma);
887 hub->buffer = NULL;
888 }
889
7d069b7d 890 kfree(hub);
1da177e4
LT		 891}
892
893static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
894{
895 struct usb_host_interface *desc;
896 struct usb_endpoint_descriptor *endpoint;
897 struct usb_device *hdev;
898 struct usb_hub *hub;
899
900 desc = intf->cur_altsetting;
901 hdev = interface_to_usbdev(intf);
902
89ccbdc9
DB		 903#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
904 if (hdev->parent) {
905 dev_warn(&intf->dev, "ignoring external hub\n");
906 return -ENODEV;
907 }
908#endif
909
1da177e4
LT		 910 /* Some hubs have a subclass of 1, which AFAICT according to the */
911 /* specs is not defined, but it works */
912 if ((desc->desc.bInterfaceSubClass != 0) &&
913 (desc->desc.bInterfaceSubClass != 1)) {
914descriptor_error:
915 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
916 return -EIO;
917 }
918
919 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
920 if (desc->desc.bNumEndpoints != 1)
921 goto descriptor_error;
922
923 endpoint = &desc->endpoint[0].desc;
924
fbf81c29
LFC		 925 /* If it's not an interrupt in endpoint, we'd better punt! */
926 if (!usb_endpoint_is_int_in(endpoint))
1da177e4
LT		 927 goto descriptor_error;
928
929 /* We found a hub */
930 dev_info (&intf->dev, "USB hub found\n");
931
0a1ef3b5 932 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1da177e4
LT		 933 if (!hub) {
934 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
935 return -ENOMEM;
936 }
937
1da177e4
LT		 938 INIT_LIST_HEAD(&hub->event_list);
939 hub->intfdev = &intf->dev;
940 hub->hdev = hdev;
941 INIT_WORK(&hub->leds, led_work, hub);
942
943 usb_set_intfdata (intf, hub);
40f122f3 944 intf->needs_remote_wakeup = 1;
1da177e4
LT		 945
946 if (hdev->speed == USB_SPEED_HIGH)
947 highspeed_hubs++;
948
949 if (hub_configure(hub, endpoint) >= 0)
950 return 0;
951
952 hub_disconnect (intf);
953 return -ENODEV;
954}
955
956static int
957hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
958{
959 struct usb_device *hdev = interface_to_usbdev (intf);
960
961 /* assert ifno == 0 (part of hub spec) */
962 switch (code) {
963 case USBDEVFS_HUB_PORTINFO: {
964 struct usbdevfs_hub_portinfo *info = user_data;
965 int i;
966
967 spin_lock_irq(&device_state_lock);
968 if (hdev->devnum <= 0)
969 info->nports = 0;
970 else {
971 info->nports = hdev->maxchild;
972 for (i = 0; i < info->nports; i++) {
973 if (hdev->children[i] == NULL)
974 info->port[i] = 0;
975 else
976 info->port[i] =
977 hdev->children[i]->devnum;
978 }
979 }
980 spin_unlock_irq(&device_state_lock);
981
982 return info->nports + 1;
983 }
984
985 default:
986 return -ENOSYS;
987 }
988}
989
1da177e4
LT		 990
991/* grab device/port lock, returning index of that port (zero based).
992 * protects the upstream link used by this device from concurrent
993 * tree operations like suspend, resume, reset, and disconnect, which
994 * apply to everything downstream of a given port.
995 */
996static int locktree(struct usb_device *udev)
997{
998 int t;
999 struct usb_device *hdev;
1000
1001 if (!udev)
1002 return -ENODEV;
1003
1004 /* root hub is always the first lock in the series */
1005 hdev = udev->parent;
1006 if (!hdev) {
1007 usb_lock_device(udev);
1008 return 0;
1009 }
1010
1011 /* on the path from root to us, lock everything from
1012 * top down, dropping parent locks when not needed
1013 */
1014 t = locktree(hdev);
1015 if (t < 0)
1016 return t;
1da177e4 1017
12c3da34
AS		 1018 /* everything is fail-fast once disconnect
1019 * processing starts
1020 */
1021 if (udev->state == USB_STATE_NOTATTACHED) {
1022 usb_unlock_device(hdev);
1023 return -ENODEV;
1da177e4 1024 }
12c3da34
AS		 1025
1026 /* when everyone grabs locks top->bottom,
1027 * non-overlapping work may be concurrent
1028 */
1029 usb_lock_device(udev);
1da177e4 1030 usb_unlock_device(hdev);
12c3da34 1031 return udev->portnum;
1da177e4
LT		 1032}
1033
1034static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1035{
1036 int i;
1037
1038 for (i = 0; i < udev->maxchild; ++i) {
1039 if (udev->children[i])
1040 recursively_mark_NOTATTACHED(udev->children[i]);
1041 }
1042 udev->state = USB_STATE_NOTATTACHED;
1043}
1044
1045/**
1046 * usb_set_device_state - change a device's current state (usbcore, hcds)
1047 * @udev: pointer to device whose state should be changed
1048 * @new_state: new state value to be stored
1049 *
1050 * udev->state is _not_ fully protected by the device lock. Although
1051 * most transitions are made only while holding the lock, the state can
1052 * can change to USB_STATE_NOTATTACHED at almost any time. This
1053 * is so that devices can be marked as disconnected as soon as possible,
1054 * without having to wait for any semaphores to be released. As a result,
1055 * all changes to any device's state must be protected by the
1056 * device_state_lock spinlock.
1057 *
1058 * Once a device has been added to the device tree, all changes to its state
1059 * should be made using this routine. The state should _not_ be set directly.
1060 *
1061 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1062 * Otherwise udev->state is set to new_state, and if new_state is
1063 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1064 * to USB_STATE_NOTATTACHED.
1065 */
1066void usb_set_device_state(struct usb_device *udev,
1067 enum usb_device_state new_state)
1068{
1069 unsigned long flags;
1070
1071 spin_lock_irqsave(&device_state_lock, flags);
1072 if (udev->state == USB_STATE_NOTATTACHED)
1073 ; /* do nothing */
b94dc6b5 1074 else if (new_state != USB_STATE_NOTATTACHED) {
fb669cc0
DB		 1075
1076 /* root hub wakeup capabilities are managed out-of-band
1077 * and may involve silicon errata ... ignore them here.
1078 */
1079 if (udev->parent) {
645daaab
AS		 1080 if (udev->state == USB_STATE_SUSPENDED
1081 || new_state == USB_STATE_SUSPENDED)
1082 ; /* No change to wakeup settings */
1083 else if (new_state == USB_STATE_CONFIGURED)
fb669cc0
DB		 1084 device_init_wakeup(&udev->dev,
1085 (udev->actconfig->desc.bmAttributes
1086 & USB_CONFIG_ATT_WAKEUP));
645daaab 1087 else
fb669cc0
DB		 1088 device_init_wakeup(&udev->dev, 0);
1089 }
645daaab 1090 udev->state = new_state;
b94dc6b5 1091 } else
1da177e4
LT		 1092 recursively_mark_NOTATTACHED(udev);
1093 spin_unlock_irqrestore(&device_state_lock, flags);
1094}
1da177e4
LT		 1095
1096
d388dab7 1097#ifdef CONFIG_PM
1c50c317
AS		 1098
1099/**
1100 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1101 * @rhdev: struct usb_device for the root hub
1102 *
1103 * The USB host controller driver calls this function when its root hub
1104 * is resumed and Vbus power has been interrupted or the controller
1105 * has been reset. The routine marks all the children of the root hub
1106 * as NOTATTACHED and marks logical connect-change events on their ports.
1107 */
1108void usb_root_hub_lost_power(struct usb_device *rhdev)
1109{
1110 struct usb_hub *hub;
1111 int port1;
1112 unsigned long flags;
1113
1114 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
353a4098
AS		 1115
1116 /* Make sure no potential wakeup events get lost,
1117 * by forcing the root hub to be resumed.
1118 */
1119 rhdev->dev.power.prev_state.event = PM_EVENT_ON;
1120
1c50c317
AS		 1121 spin_lock_irqsave(&device_state_lock, flags);
1122 hub = hdev_to_hub(rhdev);
1123 for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
1124 if (rhdev->children[port1 - 1]) {
1125 recursively_mark_NOTATTACHED(
1126 rhdev->children[port1 - 1]);
1127 set_bit(port1, hub->change_bits);
1128 }
1129 }
1130 spin_unlock_irqrestore(&device_state_lock, flags);
1131}
1132EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1133
d388dab7 1134#endif /* CONFIG_PM */
1c50c317 1135
1da177e4
LT		 1136static void choose_address(struct usb_device *udev)
1137{
1138 int devnum;
1139 struct usb_bus *bus = udev->bus;
1140
1141 /* If khubd ever becomes multithreaded, this will need a lock */
1142
1143 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1144 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1145 bus->devnum_next);
1146 if (devnum >= 128)
1147 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1148
1149 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1150
1151 if (devnum < 128) {
1152 set_bit(devnum, bus->devmap.devicemap);
1153 udev->devnum = devnum;
1154 }
1155}
1156
1157static void release_address(struct usb_device *udev)
1158{
1159 if (udev->devnum > 0) {
1160 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1161 udev->devnum = -1;
1162 }
1163}
1164
1165/**
1166 * usb_disconnect - disconnect a device (usbcore-internal)
1167 * @pdev: pointer to device being disconnected
1168 * Context: !in_interrupt ()
1169 *
1170 * Something got disconnected. Get rid of it and all of its children.
1171 *
1172 * If *pdev is a normal device then the parent hub must already be locked.
1173 * If *pdev is a root hub then this routine will acquire the
1174 * usb_bus_list_lock on behalf of the caller.
1175 *
1176 * Only hub drivers (including virtual root hub drivers for host
1177 * controllers) should ever call this.
1178 *
1179 * This call is synchronous, and may not be used in an interrupt context.
1180 */
1181void usb_disconnect(struct usb_device **pdev)
1182{
1183 struct usb_device *udev = *pdev;
1184 int i;
1185
1186 if (!udev) {
1187 pr_debug ("%s nodev\n", __FUNCTION__);
1188 return;
1189 }
1190
1191 /* mark the device as inactive, so any further urb submissions for
1192 * this device (and any of its children) will fail immediately.
1193 * this quiesces everyting except pending urbs.
1194 */
1195 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1da177e4
LT		 1196 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1197
9ad3d6cc
AS		 1198 usb_lock_device(udev);
1199
1da177e4
LT		 1200 /* Free up all the children before we remove this device */
1201 for (i = 0; i < USB_MAXCHILDREN; i++) {
1202 if (udev->children[i])
1203 usb_disconnect(&udev->children[i]);
1204 }
1205
1206 /* deallocate hcd/hardware state ... nuking all pending urbs and
1207 * cleaning up all state associated with the current configuration
1208 * so that the hardware is now fully quiesced.
1209 */
782da727 1210 dev_dbg (&udev->dev, "unregistering device\n");
1da177e4
LT		 1211 usb_disable_device(udev, 0);
1212
782da727
AS		 1213 usb_unlock_device(udev);
1214
1215 /* Unregister the device. The device driver is responsible
1216 * for removing the device files from usbfs and sysfs and for
1217 * de-configuring the device.
1218 */
1219 device_del(&udev->dev);
3099e75a 1220
782da727 1221 /* Free the device number and delete the parent's children[]
1da177e4
LT		 1222 * (or root_hub) pointer.
1223 */
1da177e4 1224 release_address(udev);
1da177e4
LT		 1225
1226 /* Avoid races with recursively_mark_NOTATTACHED() */
1227 spin_lock_irq(&device_state_lock);
1228 *pdev = NULL;
1229 spin_unlock_irq(&device_state_lock);
1230
782da727 1231 put_device(&udev->dev);
1da177e4
LT		 1232}
1233
1234#ifdef DEBUG
1235static void show_string(struct usb_device *udev, char *id, char *string)
1236{
1237 if (!string)
1238 return;
1239 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1240}
1241
1242#else
1243static inline void show_string(struct usb_device *udev, char *id, char *string)
1244{}
1245#endif
1246
1da177e4
LT		 1247
1248#ifdef CONFIG_USB_OTG
1249#include "otg_whitelist.h"
11bd44ab 1250static int __usb_port_suspend(struct usb_device *, int port1);
1da177e4
LT		 1251#endif
1252
c066475e 1253static int __usb_new_device(void *void_data)
1da177e4 1254{
c066475e 1255 struct usb_device *udev = void_data;
1da177e4 1256 int err;
1da177e4 1257
c066475e
GKH		 1258 /* Lock ourself into memory in order to keep a probe sequence
1259 * sleeping in a new thread from allowing us to be unloaded.
1260 */
1261 if (!try_module_get(THIS_MODULE))
1262 return -EINVAL;
1263
1da177e4
LT		 1264 err = usb_get_configuration(udev);
1265 if (err < 0) {
1266 dev_err(&udev->dev, "can't read configurations, error %d\n",
1267 err);
1268 goto fail;
1269 }
1270
1271 /* read the standard strings and cache them if present */
4f62efe6
AS		 1272 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1273 udev->manufacturer = usb_cache_string(udev,
1274 udev->descriptor.iManufacturer);
1275 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1da177e4
LT		 1276
1277 /* Tell the world! */
1278 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1279 "SerialNumber=%d\n",
1280 udev->descriptor.iManufacturer,
1281 udev->descriptor.iProduct,
1282 udev->descriptor.iSerialNumber);
1283 show_string(udev, "Product", udev->product);
1284 show_string(udev, "Manufacturer", udev->manufacturer);
1285 show_string(udev, "SerialNumber", udev->serial);
1286
1287#ifdef CONFIG_USB_OTG
1288 /*
1289 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1290 * to wake us after we've powered off VBUS; and HNP, switching roles
1291 * "host" to "peripheral". The OTG descriptor helps figure this out.
1292 */
1293 if (!udev->bus->is_b_host
1294 && udev->config
1295 && udev->parent == udev->bus->root_hub) {
1296 struct usb_otg_descriptor *desc = 0;
1297 struct usb_bus *bus = udev->bus;
1298
1299 /* descriptor may appear anywhere in config */
1300 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1301 le16_to_cpu(udev->config[0].desc.wTotalLength),
1302 USB_DT_OTG, (void **) &desc) == 0) {
1303 if (desc->bmAttributes & USB_OTG_HNP) {
12c3da34 1304 unsigned port1 = udev->portnum;
fc849b85 1305
1da177e4
LT		 1306 dev_info(&udev->dev,
1307 "Dual-Role OTG device on %sHNP port\n",
1308 (port1 == bus->otg_port)
1309 ? "" : "non-");
1310
1311 /* enable HNP before suspend, it's simpler */
1312 if (port1 == bus->otg_port)
1313 bus->b_hnp_enable = 1;
1314 err = usb_control_msg(udev,
1315 usb_sndctrlpipe(udev, 0),
1316 USB_REQ_SET_FEATURE, 0,
1317 bus->b_hnp_enable
1318 ? USB_DEVICE_B_HNP_ENABLE
1319 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1320 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1321 if (err < 0) {
1322 /* OTG MESSAGE: report errors here,
1323 * customize to match your product.
1324 */
1325 dev_info(&udev->dev,
1326 "can't set HNP mode; %d\n",
1327 err);
1328 bus->b_hnp_enable = 0;
1329 }
1330 }
1331 }
1332 }
1333
1334 if (!is_targeted(udev)) {
1335
1336 /* Maybe it can talk to us, though we can't talk to it.
1337 * (Includes HNP test device.)
1338 */
1339 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
140d8f68 1340 err = __usb_port_suspend(udev, udev->bus->otg_port);
1da177e4
LT		 1341 if (err < 0)
1342 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1343 }
1344 err = -ENODEV;
1345 goto fail;
1346 }
1347#endif
1348
782da727
AS		 1349 /* Register the device. The device driver is responsible
1350 * for adding the device files to usbfs and sysfs and for
1351 * configuring the device.
1352 */
1da177e4
LT		 1353 err = device_add (&udev->dev);
1354 if (err) {
1355 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1356 goto fail;
1357 }
9ad3d6cc 1358
c066475e
GKH		 1359exit:
1360 module_put(THIS_MODULE);
1361 return err;
1da177e4
LT		 1362
1363fail:
1364 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
c066475e 1365 goto exit;
1da177e4
LT		 1366}
1367
c066475e
GKH		 1368/**
1369 * usb_new_device - perform initial device setup (usbcore-internal)
1370 * @udev: newly addressed device (in ADDRESS state)
1371 *
1372 * This is called with devices which have been enumerated, but not yet
1373 * configured. The device descriptor is available, but not descriptors
1374 * for any device configuration. The caller must have locked either
1375 * the parent hub (if udev is a normal device) or else the
1376 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1377 * udev has already been installed, but udev is not yet visible through
1378 * sysfs or other filesystem code.
1379 *
1380 * The return value for this function depends on if the
1381 * multithread_probe variable is set or not. If it's set, it will
1382 * return a if the probe thread was successfully created or not. If the
1383 * variable is not set, it will return if the device is configured
1384 * properly or not. interfaces, in sysfs); else a negative errno value.
1385 *
1386 * This call is synchronous, and may not be used in an interrupt context.
1387 *
1388 * Only the hub driver or root-hub registrar should ever call this.
1389 */
1390int usb_new_device(struct usb_device *udev)
1391{
1392 struct task_struct *probe_task;
1393 int ret = 0;
1394
1395 if (multithread_probe) {
1396 probe_task = kthread_run(__usb_new_device, udev,
1397 "usb-probe-%s", udev->devnum);
1398 if (IS_ERR(probe_task))
1399 ret = PTR_ERR(probe_task);
1400 } else
1401 ret = __usb_new_device(udev);
1402
1403 return ret;
1404}
1da177e4
LT		 1405
1406static int hub_port_status(struct usb_hub *hub, int port1,
1407 u16 *status, u16 *change)
1408{
1409 int ret;
1410
1411 ret = get_port_status(hub->hdev, port1, &hub->status->port);
d25450c6 1412 if (ret < 4) {
1da177e4
LT		 1413 dev_err (hub->intfdev,
1414 "%s failed (err = %d)\n", __FUNCTION__, ret);
d25450c6
AS		 1415 if (ret >= 0)
1416 ret = -EIO;
1417 } else {
1da177e4
LT		 1418 *status = le16_to_cpu(hub->status->port.wPortStatus);
1419 *change = le16_to_cpu(hub->status->port.wPortChange);
1420 ret = 0;
1421 }
1422 return ret;
1423}
1424
0165de09
IPG		 1425
1426/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1427static unsigned hub_is_wusb(struct usb_hub *hub)
1428{
1429 struct usb_hcd *hcd;
1430 if (hub->hdev->parent != NULL) /* not a root hub? */
1431 return 0;
1432 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1433 return hcd->wireless;
1434}
1435
1436
1da177e4
LT		 1437#define PORT_RESET_TRIES 5
1438#define SET_ADDRESS_TRIES 2
1439#define GET_DESCRIPTOR_TRIES 2
1440#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1441#define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1442
1443#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1444#define HUB_SHORT_RESET_TIME 10
1445#define HUB_LONG_RESET_TIME 200
1446#define HUB_RESET_TIMEOUT 500
1447
1448static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1449 struct usb_device *udev, unsigned int delay)
1450{
1451 int delay_time, ret;
1452 u16 portstatus;
1453 u16 portchange;
1454
1455 for (delay_time = 0;
1456 delay_time < HUB_RESET_TIMEOUT;
1457 delay_time += delay) {
1458 /* wait to give the device a chance to reset */
1459 msleep(delay);
1460
1461 /* read and decode port status */
1462 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1463 if (ret < 0)
1464 return ret;
1465
1466 /* Device went away? */
1467 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1468 return -ENOTCONN;
1469
1470 /* bomb out completely if something weird happened */
1471 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1472 return -EINVAL;
1473
1474 /* if we`ve finished resetting, then break out of the loop */
1475 if (!(portstatus & USB_PORT_STAT_RESET) &&
1476 (portstatus & USB_PORT_STAT_ENABLE)) {
0165de09
IPG		 1477 if (hub_is_wusb(hub))
1478 udev->speed = USB_SPEED_VARIABLE;
1479 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1da177e4
LT		 1480 udev->speed = USB_SPEED_HIGH;
1481 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1482 udev->speed = USB_SPEED_LOW;
1483 else
1484 udev->speed = USB_SPEED_FULL;
1485 return 0;
1486 }
1487
1488 /* switch to the long delay after two short delay failures */
1489 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1490 delay = HUB_LONG_RESET_TIME;
1491
1492 dev_dbg (hub->intfdev,
1493 "port %d not reset yet, waiting %dms\n",
1494 port1, delay);
1495 }
1496
1497 return -EBUSY;
1498}
1499
1500static int hub_port_reset(struct usb_hub *hub, int port1,
1501 struct usb_device *udev, unsigned int delay)
1502{
1503 int i, status;
1504
1505 /* Reset the port */
1506 for (i = 0; i < PORT_RESET_TRIES; i++) {
1507 status = set_port_feature(hub->hdev,
1508 port1, USB_PORT_FEAT_RESET);
1509 if (status)
1510 dev_err(hub->intfdev,
1511 "cannot reset port %d (err = %d)\n",
1512 port1, status);
1513 else {
1514 status = hub_port_wait_reset(hub, port1, udev, delay);
dd16525b 1515 if (status && status != -ENOTCONN)
1da177e4
LT		 1516 dev_dbg(hub->intfdev,
1517 "port_wait_reset: err = %d\n",
1518 status);
1519 }
1520
1521 /* return on disconnect or reset */
1522 switch (status) {
1523 case 0:
b789696a
DB		 1524 /* TRSTRCY = 10 ms; plus some extra */
1525 msleep(10 + 40);
1da177e4
LT		 1526 /* FALL THROUGH */
1527 case -ENOTCONN:
1528 case -ENODEV:
1529 clear_port_feature(hub->hdev,
1530 port1, USB_PORT_FEAT_C_RESET);
1531 /* FIXME need disconnect() for NOTATTACHED device */
1532 usb_set_device_state(udev, status
1533 ? USB_STATE_NOTATTACHED
1534 : USB_STATE_DEFAULT);
1535 return status;
1536 }
1537
1538 dev_dbg (hub->intfdev,
1539 "port %d not enabled, trying reset again...\n",
1540 port1);
1541 delay = HUB_LONG_RESET_TIME;
1542 }
1543
1544 dev_err (hub->intfdev,
1545 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1546 port1);
1547
1548 return status;
1549}
1550
1da177e4
LT		 1551/*
1552 * Disable a port and mark a logical connnect-change event, so that some
1553 * time later khubd will disconnect() any existing usb_device on the port
1554 * and will re-enumerate if there actually is a device attached.
1555 */
1556static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1557{
1558 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1559 hub_port_disable(hub, port1, 1);
1560
1561 /* FIXME let caller ask to power down the port:
1562 * - some devices won't enumerate without a VBUS power cycle
1563 * - SRP saves power that way
390a8c34 1564 * - ... new call, TBD ...
1da177e4
LT		 1565 * That's easy if this hub can switch power per-port, and
1566 * khubd reactivates the port later (timer, SRP, etc).
1567 * Powerdown must be optional, because of reset/DFU.
1568 */
1569
1570 set_bit(port1, hub->change_bits);
1571 kick_khubd(hub);
1572}
1573
d388dab7 1574#ifdef CONFIG_PM
1da177e4
LT		 1575
1576#ifdef CONFIG_USB_SUSPEND
1577
1578/*
1579 * Selective port suspend reduces power; most suspended devices draw
1580 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1581 * All devices below the suspended port are also suspended.
1582 *
1583 * Devices leave suspend state when the host wakes them up. Some devices
1584 * also support "remote wakeup", where the device can activate the USB
1585 * tree above them to deliver data, such as a keypress or packet. In
1586 * some cases, this wakes the USB host.
1587 */
1588static int hub_port_suspend(struct usb_hub *hub, int port1,
1589 struct usb_device *udev)
1590{
1591 int status;
1592
1593 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1594
1595 /* enable remote wakeup when appropriate; this lets the device
1596 * wake up the upstream hub (including maybe the root hub).
1597 *
1598 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1599 * we don't explicitly enable it here.
1600 */
645daaab 1601 if (udev->do_remote_wakeup) {
1da177e4
LT		 1602 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1603 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1604 USB_DEVICE_REMOTE_WAKEUP, 0,
1605 NULL, 0,
1606 USB_CTRL_SET_TIMEOUT);
1607 if (status)
1608 dev_dbg(&udev->dev,
1609 "won't remote wakeup, status %d\n",
1610 status);
1611 }
1612
1613 /* see 7.1.7.6 */
1614 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1615 if (status) {
1616 dev_dbg(hub->intfdev,
1617 "can't suspend port %d, status %d\n",
1618 port1, status);
1619 /* paranoia: "should not happen" */
1620 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1621 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1622 USB_DEVICE_REMOTE_WAKEUP, 0,
1623 NULL, 0,
1624 USB_CTRL_SET_TIMEOUT);
1625 } else {
1626 /* device has up to 10 msec to fully suspend */
645daaab
AS		 1627 dev_dbg(&udev->dev, "usb %ssuspend\n",
1628 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1629 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1630 msleep(10);
1631 }
1632 return status;
1633}
1634
1635/*
1636 * Devices on USB hub ports have only one "suspend" state, corresponding
ba9d35fb 1637 * to ACPI D2, "may cause the device to lose some context".
1da177e4
LT		 1638 * State transitions include:
1639 *
1640 * - suspend, resume ... when the VBUS power link stays live
1641 * - suspend, disconnect ... VBUS lost
1642 *
1643 * Once VBUS drop breaks the circuit, the port it's using has to go through
1644 * normal re-enumeration procedures, starting with enabling VBUS power.
1645 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1646 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1647 * timer, no SRP, no requests through sysfs.
390a8c34
DB		 1648 *
1649 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1650 * the root hub for their bus goes into global suspend ... so we don't
1651 * (falsely) update the device power state to say it suspended.
1da177e4 1652 */
140d8f68 1653static int __usb_port_suspend (struct usb_device *udev, int port1)
1da177e4 1654{
f3f3253d 1655 int status = 0;
1da177e4
LT		 1656
1657 /* caller owns the udev device lock */
1658 if (port1 < 0)
1659 return port1;
1660
140d8f68
AS		 1661 /* we change the device's upstream USB link,
1662 * but root hubs have no upstream USB link.
1da177e4 1663 */
f3f3253d 1664 if (udev->parent)
1da177e4
LT		 1665 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1666 udev);
2bf4086d 1667 else {
645daaab
AS		 1668 dev_dbg(&udev->dev, "usb %ssuspend\n",
1669 udev->auto_pm ? "auto-" : "");
2bf4086d
AS		 1670 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1671 }
1da177e4
LT		 1672 return status;
1673}
1674
5edbfb7c 1675/*
140d8f68 1676 * usb_port_suspend - suspend a usb device's upstream port
1da177e4 1677 * @udev: device that's no longer in active use
5edbfb7c 1678 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1679 *
1680 * Suspends a USB device that isn't in active use, conserving power.
1681 * Devices may wake out of a suspend, if anything important happens,
1682 * using the remote wakeup mechanism. They may also be taken out of
140d8f68 1683 * suspend by the host, using usb_port_resume(). It's also routine
1da177e4
LT		 1684 * to disconnect devices while they are suspended.
1685 *
390a8c34
DB		 1686 * This only affects the USB hardware for a device; its interfaces
1687 * (and, for hubs, child devices) must already have been suspended.
1688 *
1da177e4
LT		 1689 * Suspending OTG devices may trigger HNP, if that's been enabled
1690 * between a pair of dual-role devices. That will change roles, such
1691 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1692 *
1693 * Returns 0 on success, else negative errno.
1694 */
140d8f68 1695int usb_port_suspend(struct usb_device *udev)
1da177e4 1696{
140d8f68 1697 return __usb_port_suspend(udev, udev->portnum);
1da177e4 1698}
f3f3253d 1699
1da177e4 1700/*
390a8c34
DB		 1701 * If the USB "suspend" state is in use (rather than "global suspend"),
1702 * many devices will be individually taken out of suspend state using
1703 * special" resume" signaling. These routines kick in shortly after
1da177e4
LT		 1704 * hardware resume signaling is finished, either because of selective
1705 * resume (by host) or remote wakeup (by device) ... now see what changed
1706 * in the tree that's rooted at this device.
1707 */
140d8f68 1708static int finish_port_resume(struct usb_device *udev)
1da177e4
LT		 1709{
1710 int status;
1711 u16 devstatus;
1712
1713 /* caller owns the udev device lock */
f3f3253d 1714 dev_dbg(&udev->dev, "finish resume\n");
1da177e4
LT		 1715
1716 /* usb ch9 identifies four variants of SUSPENDED, based on what
1717 * state the device resumes to. Linux currently won't see the
1718 * first two on the host side; they'd be inside hub_port_init()
1719 * during many timeouts, but khubd can't suspend until later.
1720 */
1721 usb_set_device_state(udev, udev->actconfig
1722 ? USB_STATE_CONFIGURED
1723 : USB_STATE_ADDRESS);
1da177e4
LT		 1724
1725 /* 10.5.4.5 says be sure devices in the tree are still there.
1726 * For now let's assume the device didn't go crazy on resume,
1727 * and device drivers will know about any resume quirks.
1728 */
1729 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
b40b7a90
AS		 1730 if (status >= 0)
1731 status = (status == 2 ? 0 : -ENODEV);
1732
1733 if (status)
1da177e4
LT		 1734 dev_dbg(&udev->dev,
1735 "gone after usb resume? status %d\n",
1736 status);
1737 else if (udev->actconfig) {
1da177e4 1738 le16_to_cpus(&devstatus);
55c52718 1739 if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
f3f3253d 1740 && udev->parent) {
1da177e4
LT		 1741 status = usb_control_msg(udev,
1742 usb_sndctrlpipe(udev, 0),
1743 USB_REQ_CLEAR_FEATURE,
1744 USB_RECIP_DEVICE,
1745 USB_DEVICE_REMOTE_WAKEUP, 0,
1746 NULL, 0,
1747 USB_CTRL_SET_TIMEOUT);
a8e7c565 1748 if (status)
1da177e4
LT		 1749 dev_dbg(&udev->dev, "disable remote "
1750 "wakeup, status %d\n", status);
4bf0ba86 1751 }
1da177e4
LT		 1752 status = 0;
1753
1754 } else if (udev->devnum <= 0) {
1755 dev_dbg(&udev->dev, "bogus resume!\n");
1756 status = -EINVAL;
1757 }
1758 return status;
1759}
1760
1761static int
1762hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1763{
1764 int status;
d25450c6
AS		 1765 u16 portchange, portstatus;
1766
1767 /* Skip the initial Clear-Suspend step for a remote wakeup */
1768 status = hub_port_status(hub, port1, &portstatus, &portchange);
1769 if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
1770 goto SuspendCleared;
1da177e4
LT		 1771
1772 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1773
d5cbad4b
AS		 1774 set_bit(port1, hub->busy_bits);
1775
1da177e4
LT		 1776 /* see 7.1.7.7; affects power usage, but not budgeting */
1777 status = clear_port_feature(hub->hdev,
1778 port1, USB_PORT_FEAT_SUSPEND);
1779 if (status) {
1780 dev_dbg(hub->intfdev,
1781 "can't resume port %d, status %d\n",
1782 port1, status);
1783 } else {
1da177e4
LT		 1784 /* drive resume for at least 20 msec */
1785 if (udev)
645daaab
AS		 1786 dev_dbg(&udev->dev, "usb %sresume\n",
1787 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1788 msleep(25);
1789
1790#define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1791 | USB_PORT_STAT_ENABLE \
1792 | USB_PORT_STAT_CONNECTION)
1793
1794 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1795 * stop resume signaling. Then finish the resume
1796 * sequence.
1797 */
d25450c6
AS		 1798 status = hub_port_status(hub, port1, &portstatus, &portchange);
1799SuspendCleared:
1da177e4 1800 if (status < 0
d25450c6
AS		 1801 || (portstatus & LIVE_FLAGS) != LIVE_FLAGS
1802 || (portstatus & USB_PORT_STAT_SUSPEND) != 0
1da177e4
LT		 1803 ) {
1804 dev_dbg(hub->intfdev,
1805 "port %d status %04x.%04x after resume, %d\n",
d25450c6 1806 port1, portchange, portstatus, status);
20307949
AS		 1807 if (status >= 0)
1808 status = -ENODEV;
1da177e4 1809 } else {
20307949
AS		 1810 if (portchange & USB_PORT_STAT_C_SUSPEND)
1811 clear_port_feature(hub->hdev, port1,
1812 USB_PORT_FEAT_C_SUSPEND);
1da177e4
LT		 1813 /* TRSMRCY = 10 msec */
1814 msleep(10);
1815 if (udev)
140d8f68 1816 status = finish_port_resume(udev);
1da177e4
LT		 1817 }
1818 }
1819 if (status < 0)
1820 hub_port_logical_disconnect(hub, port1);
1821
d5cbad4b
AS		 1822 clear_bit(port1, hub->busy_bits);
1823 if (!hub->hdev->parent && !hub->busy_bits[0])
1824 usb_enable_root_hub_irq(hub->hdev->bus);
1825
1da177e4
LT		 1826 return status;
1827}
1828
5edbfb7c 1829/*
140d8f68 1830 * usb_port_resume - re-activate a suspended usb device's upstream port
1da177e4 1831 * @udev: device to re-activate
5edbfb7c 1832 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1833 *
1834 * This will re-activate the suspended device, increasing power usage
1835 * while letting drivers communicate again with its endpoints.
1836 * USB resume explicitly guarantees that the power session between
1837 * the host and the device is the same as it was when the device
1838 * suspended.
1839 *
1840 * Returns 0 on success, else negative errno.
1841 */
140d8f68 1842int usb_port_resume(struct usb_device *udev)
1da177e4 1843{
d388dab7 1844 int status;
1da177e4 1845
140d8f68
AS		 1846 /* we change the device's upstream USB link,
1847 * but root hubs have no upstream USB link.
1848 */
f3f3253d 1849 if (udev->parent) {
114b368c
AS		 1850 // NOTE this fails if parent is also suspended...
1851 status = hub_port_resume(hdev_to_hub(udev->parent),
1852 udev->portnum, udev);
645daaab
AS		 1853 } else {
1854 dev_dbg(&udev->dev, "usb %sresume\n",
1855 udev->auto_pm ? "auto-" : "");
140d8f68 1856 status = finish_port_resume(udev);
645daaab 1857 }
f3f3253d 1858 if (status < 0)
a8e7c565 1859 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
1da177e4
LT		 1860 return status;
1861}
1862
1863static int remote_wakeup(struct usb_device *udev)
1864{
1865 int status = 0;
1866
9ad3d6cc 1867 usb_lock_device(udev);
1da177e4 1868 if (udev->state == USB_STATE_SUSPENDED) {
645daaab 1869 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
d25450c6
AS		 1870 status = usb_autoresume_device(udev, 1);
1871
1872 /* Give the interface drivers a chance to do something,
1873 * then autosuspend the device again. */
645daaab 1874 if (status == 0)
d25450c6 1875 usb_autosuspend_device(udev, 1);
1da177e4 1876 }
9ad3d6cc 1877 usb_unlock_device(udev);
1da177e4
LT		 1878 return status;
1879}
1880
d388dab7
AS		 1881#else /* CONFIG_USB_SUSPEND */
1882
1883/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1884
1885int usb_port_suspend(struct usb_device *udev)
1886{
1887 return 0;
1888}
1889
1890static inline int
1891finish_port_resume(struct usb_device *udev)
1892{
1893 return 0;
1894}
1895
1896static inline int
1897hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1898{
1899 return 0;
1900}
1901
1902int usb_port_resume(struct usb_device *udev)
1903{
1904 return 0;
1905}
1906
1907static inline int remote_wakeup(struct usb_device *udev)
1908{
1909 return 0;
1910}
1911
1912#endif
1913
db690874 1914static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1da177e4
LT		 1915{
1916 struct usb_hub *hub = usb_get_intfdata (intf);
1917 struct usb_device *hdev = hub->hdev;
1918 unsigned port1;
1da177e4 1919
c9f89fa4 1920 /* fail if children aren't already suspended */
1da177e4
LT		 1921 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1922 struct usb_device *udev;
1923
1924 udev = hdev->children [port1-1];
114b368c 1925 if (udev && msg.event == PM_EVENT_SUSPEND &&
f3f3253d 1926#ifdef CONFIG_USB_SUSPEND
114b368c
AS		 1927 udev->state != USB_STATE_SUSPENDED
1928#else
1929 udev->dev.power.power_state.event
1930 == PM_EVENT_ON
f3f3253d 1931#endif
114b368c 1932 ) {
645daaab
AS		 1933 if (!hdev->auto_pm)
1934 dev_dbg(&intf->dev, "port %d nyet suspended\n",
1935 port1);
c9f89fa4
DB		 1936 return -EBUSY;
1937 }
1da177e4
LT		 1938 }
1939
40f122f3
AS		 1940 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1941
f3f3253d
DB		 1942 /* "global suspend" of the downstream HC-to-USB interface */
1943 if (!hdev->parent) {
1944 struct usb_bus *bus = hdev->bus;
0c0382e3
AS		 1945 if (bus) {
1946 int status = hcd_bus_suspend (bus);
f3f3253d
DB		 1947
1948 if (status != 0) {
1949 dev_dbg(&hdev->dev, "'global' suspend %d\n",
1950 status);
1951 return status;
1952 }
1953 } else
1954 return -EOPNOTSUPP;
1955 }
1956
c9f89fa4
DB		 1957 /* stop khubd and related activity */
1958 hub_quiesce(hub);
1da177e4
LT		 1959 return 0;
1960}
1961
1962static int hub_resume(struct usb_interface *intf)
1963{
1da177e4 1964 struct usb_hub *hub = usb_get_intfdata (intf);
40f122f3 1965 struct usb_device *hdev = hub->hdev;
1da177e4
LT		 1966 int status;
1967
40f122f3
AS		 1968 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1969
f3f3253d
DB		 1970 /* "global resume" of the downstream HC-to-USB interface */
1971 if (!hdev->parent) {
1972 struct usb_bus *bus = hdev->bus;
0c0382e3
AS		 1973 if (bus) {
1974 status = hcd_bus_resume (bus);
f3f3253d
DB		 1975 if (status) {
1976 dev_dbg(&intf->dev, "'global' resume %d\n",
1977 status);
1978 return status;
1979 }
1980 } else
1981 return -EOPNOTSUPP;
1982 if (status == 0) {
1983 /* TRSMRCY = 10 msec */
1984 msleep(10);
1985 }
1986 }
1987
a8e7c565 1988 /* tell khubd to look for changes on this hub */
f3f3253d 1989 hub_activate(hub);
1da177e4
LT		 1990 return 0;
1991}
1992
d388dab7
AS		 1993#else /* CONFIG_PM */
1994
1995static inline int remote_wakeup(struct usb_device *udev)
1996{
1997 return 0;
1998}
1999
511366da
AM		 2000#define hub_suspend NULL
2001#define hub_resume NULL
d388dab7
AS		 2002#endif
2003
1da177e4
LT		 2004void usb_resume_root_hub(struct usb_device *hdev)
2005{
2006 struct usb_hub *hub = hdev_to_hub(hdev);
2007
1da177e4
LT		 2008 kick_khubd(hub);
2009}
2010
1da177e4
LT		 2011
2012/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2013 *
2014 * Between connect detection and reset signaling there must be a delay
2015 * of 100ms at least for debounce and power-settling. The corresponding
2016 * timer shall restart whenever the downstream port detects a disconnect.
2017 *
2018 * Apparently there are some bluetooth and irda-dongles and a number of
2019 * low-speed devices for which this debounce period may last over a second.
2020 * Not covered by the spec - but easy to deal with.
2021 *
2022 * This implementation uses a 1500ms total debounce timeout; if the
2023 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2024 * every 25ms for transient disconnects. When the port status has been
2025 * unchanged for 100ms it returns the port status.
2026 */
2027
2028#define HUB_DEBOUNCE_TIMEOUT 1500
2029#define HUB_DEBOUNCE_STEP 25
2030#define HUB_DEBOUNCE_STABLE 100
2031
2032static int hub_port_debounce(struct usb_hub *hub, int port1)
2033{
2034 int ret;
2035 int total_time, stable_time = 0;
2036 u16 portchange, portstatus;
2037 unsigned connection = 0xffff;
2038
2039 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2040 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2041 if (ret < 0)
2042 return ret;
2043
2044 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2045 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2046 stable_time += HUB_DEBOUNCE_STEP;
2047 if (stable_time >= HUB_DEBOUNCE_STABLE)
2048 break;
2049 } else {
2050 stable_time = 0;
2051 connection = portstatus & USB_PORT_STAT_CONNECTION;
2052 }
2053
2054 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2055 clear_port_feature(hub->hdev, port1,
2056 USB_PORT_FEAT_C_CONNECTION);
2057 }
2058
2059 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2060 break;
2061 msleep(HUB_DEBOUNCE_STEP);
2062 }
2063
2064 dev_dbg (hub->intfdev,
2065 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2066 port1, total_time, stable_time, portstatus);
2067
2068 if (stable_time < HUB_DEBOUNCE_STABLE)
2069 return -ETIMEDOUT;
2070 return portstatus;
2071}
2072
2073static void ep0_reinit(struct usb_device *udev)
2074{
2075 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2076 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2077 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2078}
2079
2080#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2081#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2082
2083static int hub_set_address(struct usb_device *udev)
2084{
2085 int retval;
2086
2087 if (udev->devnum == 0)
2088 return -EINVAL;
2089 if (udev->state == USB_STATE_ADDRESS)
2090 return 0;
2091 if (udev->state != USB_STATE_DEFAULT)
2092 return -EINVAL;
2093 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2094 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2095 NULL, 0, USB_CTRL_SET_TIMEOUT);
2096 if (retval == 0) {
2097 usb_set_device_state(udev, USB_STATE_ADDRESS);
2098 ep0_reinit(udev);
2099 }
2100 return retval;
2101}
2102
2103/* Reset device, (re)assign address, get device descriptor.
2104 * Device connection must be stable, no more debouncing needed.
2105 * Returns device in USB_STATE_ADDRESS, except on error.
2106 *
2107 * If this is called for an already-existing device (as part of
2108 * usb_reset_device), the caller must own the device lock. For a
2109 * newly detected device that is not accessible through any global
2110 * pointers, it's not necessary to lock the device.
2111 */
2112static int
2113hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2114 int retry_counter)
2115{
4186ecf8 2116 static DEFINE_MUTEX(usb_address0_mutex);
1da177e4
LT		 2117
2118 struct usb_device *hdev = hub->hdev;
2119 int i, j, retval;
2120 unsigned delay = HUB_SHORT_RESET_TIME;
2121 enum usb_device_speed oldspeed = udev->speed;
83a07196 2122 char *speed, *type;
1da177e4
LT		 2123
2124 /* root hub ports have a slightly longer reset period
2125 * (from USB 2.0 spec, section 7.1.7.5)
2126 */
2127 if (!hdev->parent) {
2128 delay = HUB_ROOT_RESET_TIME;
2129 if (port1 == hdev->bus->otg_port)
2130 hdev->bus->b_hnp_enable = 0;
2131 }
2132
2133 /* Some low speed devices have problems with the quick delay, so */
2134 /* be a bit pessimistic with those devices. RHbug #23670 */
2135 if (oldspeed == USB_SPEED_LOW)
2136 delay = HUB_LONG_RESET_TIME;
2137
4186ecf8 2138 mutex_lock(&usb_address0_mutex);
1da177e4
LT		 2139
2140 /* Reset the device; full speed may morph to high speed */
2141 retval = hub_port_reset(hub, port1, udev, delay);
2142 if (retval < 0) /* error or disconnect */
2143 goto fail;
2144 /* success, speed is known */
2145 retval = -ENODEV;
2146
2147 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2148 dev_dbg(&udev->dev, "device reset changed speed!\n");
2149 goto fail;
2150 }
2151 oldspeed = udev->speed;
2152
2153 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2154 * it's fixed size except for full speed devices.
5bb6e0ae
IPG		 2155 * For Wireless USB devices, ep0 max packet is always 512 (tho
2156 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
1da177e4
LT		 2157 */
2158 switch (udev->speed) {
5bb6e0ae
IPG		 2159 case USB_SPEED_VARIABLE: /* fixed at 512 */
2160 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
2161 break;
1da177e4
LT		 2162 case USB_SPEED_HIGH: /* fixed at 64 */
2163 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2164 break;
2165 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2166 /* to determine the ep0 maxpacket size, try to read
2167 * the device descriptor to get bMaxPacketSize0 and
2168 * then correct our initial guess.
2169 */
2170 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2171 break;
2172 case USB_SPEED_LOW: /* fixed at 8 */
2173 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2174 break;
2175 default:
2176 goto fail;
2177 }
2178
83a07196
IPG		 2179 type = "";
2180 switch (udev->speed) {
2181 case USB_SPEED_LOW: speed = "low"; break;
2182 case USB_SPEED_FULL: speed = "full"; break;
2183 case USB_SPEED_HIGH: speed = "high"; break;
2184 case USB_SPEED_VARIABLE:
2185 speed = "variable";
2186 type = "Wireless ";
2187 break;
2188 default: speed = "?"; break;
2189 }
1da177e4 2190 dev_info (&udev->dev,
83a07196
IPG		 2191 "%s %s speed %sUSB device using %s and address %d\n",
2192 (udev->config) ? "reset" : "new", speed, type,
2193 udev->bus->controller->driver->name, udev->devnum);
1da177e4
LT		 2194
2195 /* Set up TT records, if needed */
2196 if (hdev->tt) {
2197 udev->tt = hdev->tt;
2198 udev->ttport = hdev->ttport;
2199 } else if (udev->speed != USB_SPEED_HIGH
2200 && hdev->speed == USB_SPEED_HIGH) {
2201 udev->tt = &hub->tt;
2202 udev->ttport = port1;
2203 }
2204
2205 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2206 * Because device hardware and firmware is sometimes buggy in
2207 * this area, and this is how Linux has done it for ages.
2208 * Change it cautiously.
2209 *
2210 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2211 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2212 * so it may help with some non-standards-compliant devices.
2213 * Otherwise we start with SET_ADDRESS and then try to read the
2214 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2215 * value.
2216 */
2217 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2218 if (USE_NEW_SCHEME(retry_counter)) {
2219 struct usb_device_descriptor *buf;
2220 int r = 0;
2221
2222#define GET_DESCRIPTOR_BUFSIZE 64
2223 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2224 if (!buf) {
2225 retval = -ENOMEM;
2226 continue;
2227 }
2228
2229 /* Use a short timeout the first time through,
2230 * so that recalcitrant full-speed devices with
2231 * 8- or 16-byte ep0-maxpackets won't slow things
2232 * down tremendously by NAKing the unexpectedly
2233 * early status stage. Also, retry on all errors;
2234 * some devices are flakey.
5bb6e0ae
IPG		 2235 * 255 is for WUSB devices, we actually need to use 512.
2236 * WUSB1.0[4.8.1].
1da177e4
LT		 2237 */
2238 for (j = 0; j < 3; ++j) {
2239 buf->bMaxPacketSize0 = 0;
2240 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2241 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2242 USB_DT_DEVICE << 8, 0,
2243 buf, GET_DESCRIPTOR_BUFSIZE,
2244 (i ? USB_CTRL_GET_TIMEOUT : 1000));
2245 switch (buf->bMaxPacketSize0) {
5bb6e0ae 2246 case 8: case 16: case 32: case 64: case 255:
1da177e4
LT		 2247 if (buf->bDescriptorType ==
2248 USB_DT_DEVICE) {
2249 r = 0;
2250 break;
2251 }
2252 /* FALL THROUGH */
2253 default:
2254 if (r == 0)
2255 r = -EPROTO;
2256 break;
2257 }
2258 if (r == 0)
2259 break;
2260 }
2261 udev->descriptor.bMaxPacketSize0 =
2262 buf->bMaxPacketSize0;
2263 kfree(buf);
2264
2265 retval = hub_port_reset(hub, port1, udev, delay);
2266 if (retval < 0) /* error or disconnect */
2267 goto fail;
2268 if (oldspeed != udev->speed) {
2269 dev_dbg(&udev->dev,
2270 "device reset changed speed!\n");
2271 retval = -ENODEV;
2272 goto fail;
2273 }
2274 if (r) {
2275 dev_err(&udev->dev, "device descriptor "
2276 "read/%s, error %d\n",
2277 "64", r);
2278 retval = -EMSGSIZE;
2279 continue;
2280 }
2281#undef GET_DESCRIPTOR_BUFSIZE
2282 }
2283
2284 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2285 retval = hub_set_address(udev);
2286 if (retval >= 0)
2287 break;
2288 msleep(200);
2289 }
2290 if (retval < 0) {
2291 dev_err(&udev->dev,
2292 "device not accepting address %d, error %d\n",
2293 udev->devnum, retval);
2294 goto fail;
2295 }
2296
2297 /* cope with hardware quirkiness:
2298 * - let SET_ADDRESS settle, some device hardware wants it
2299 * - read ep0 maxpacket even for high and low speed,
2300 */
2301 msleep(10);
2302 if (USE_NEW_SCHEME(retry_counter))
2303 break;
2304
2305 retval = usb_get_device_descriptor(udev, 8);
2306 if (retval < 8) {
2307 dev_err(&udev->dev, "device descriptor "
2308 "read/%s, error %d\n",
2309 "8", retval);
2310 if (retval >= 0)
2311 retval = -EMSGSIZE;
2312 } else {
2313 retval = 0;
2314 break;
2315 }
2316 }
2317 if (retval)
2318 goto fail;
2319
5bb6e0ae
IPG		 2320 i = udev->descriptor.bMaxPacketSize0 == 0xff?
2321 512 : udev->descriptor.bMaxPacketSize0;
1da177e4
LT		 2322 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2323 if (udev->speed != USB_SPEED_FULL ||
2324 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2325 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2326 retval = -EMSGSIZE;
2327 goto fail;
2328 }
2329 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2330 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2331 ep0_reinit(udev);
2332 }
2333
2334 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2335 if (retval < (signed)sizeof(udev->descriptor)) {
2336 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2337 "all", retval);
2338 if (retval >= 0)
2339 retval = -ENOMSG;
2340 goto fail;
2341 }
2342
2343 retval = 0;
2344
2345fail:
2346 if (retval)
2347 hub_port_disable(hub, port1, 0);
4186ecf8 2348 mutex_unlock(&usb_address0_mutex);
1da177e4
LT		 2349 return retval;
2350}
2351
2352static void
2353check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2354{
2355 struct usb_qualifier_descriptor *qual;
2356 int status;
2357
2358 qual = kmalloc (sizeof *qual, SLAB_KERNEL);
2359 if (qual == NULL)
2360 return;
2361
2362 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2363 qual, sizeof *qual);
2364 if (status == sizeof *qual) {
2365 dev_info(&udev->dev, "not running at top speed; "
2366 "connect to a high speed hub\n");
2367 /* hub LEDs are probably harder to miss than syslog */
2368 if (hub->has_indicators) {
2369 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2370 schedule_work (&hub->leds);
2371 }
2372 }
1bc3c9e1 2373 kfree(qual);
1da177e4
LT		 2374}
2375
2376static unsigned
2377hub_power_remaining (struct usb_hub *hub)
2378{
2379 struct usb_device *hdev = hub->hdev;
2380 int remaining;
55c52718 2381 int port1;
1da177e4 2382
55c52718 2383 if (!hub->limited_power)
1da177e4
LT		 2384 return 0;
2385
55c52718
AS		 2386 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2387 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2388 struct usb_device *udev = hdev->children[port1 - 1];
2389 int delta;
1da177e4
LT		 2390
2391 if (!udev)
2392 continue;
2393
55c52718
AS		 2394 /* Unconfigured devices may not use more than 100mA,
2395 * or 8mA for OTG ports */
1da177e4 2396 if (udev->actconfig)
55c52718
AS		 2397 delta = udev->actconfig->desc.bMaxPower * 2;
2398 else if (port1 != udev->bus->otg_port || hdev->parent)
2399 delta = 100;
1da177e4 2400 else
55c52718
AS		 2401 delta = 8;
2402 if (delta > hub->mA_per_port)
2403 dev_warn(&udev->dev, "%dmA is over %umA budget "
2404 "for port %d!\n",
2405 delta, hub->mA_per_port, port1);
1da177e4
LT		 2406 remaining -= delta;
2407 }
2408 if (remaining < 0) {
55c52718
AS		 2409 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2410 - remaining);
1da177e4
LT		 2411 remaining = 0;
2412 }
2413 return remaining;
2414}
2415
2416/* Handle physical or logical connection change events.
2417 * This routine is called when:
2418 * a port connection-change occurs;
2419 * a port enable-change occurs (often caused by EMI);
2420 * usb_reset_device() encounters changed descriptors (as from
2421 * a firmware download)
2422 * caller already locked the hub
2423 */
2424static void hub_port_connect_change(struct usb_hub *hub, int port1,
2425 u16 portstatus, u16 portchange)
2426{
2427 struct usb_device *hdev = hub->hdev;
2428 struct device *hub_dev = hub->intfdev;
74ad9bd2 2429 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4
LT		 2430 int status, i;
2431
2432 dev_dbg (hub_dev,
2433 "port %d, status %04x, change %04x, %s\n",
2434 port1, portstatus, portchange, portspeed (portstatus));
2435
2436 if (hub->has_indicators) {
2437 set_port_led(hub, port1, HUB_LED_AUTO);
2438 hub->indicator[port1-1] = INDICATOR_AUTO;
2439 }
2440
2441 /* Disconnect any existing devices under this port */
2442 if (hdev->children[port1-1])
2443 usb_disconnect(&hdev->children[port1-1]);
2444 clear_bit(port1, hub->change_bits);
2445
2446#ifdef CONFIG_USB_OTG
2447 /* during HNP, don't repeat the debounce */
2448 if (hdev->bus->is_b_host)
2449 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2450#endif
2451
2452 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2453 status = hub_port_debounce(hub, port1);
2454 if (status < 0) {
2455 dev_err (hub_dev,
2456 "connect-debounce failed, port %d disabled\n",
2457 port1);
2458 goto done;
2459 }
2460 portstatus = status;
2461 }
2462
2463 /* Return now if nothing is connected */
2464 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2465
2466 /* maybe switch power back on (e.g. root hub was reset) */
74ad9bd2 2467 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
1da177e4
LT		 2468 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2469 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2470
2471 if (portstatus & USB_PORT_STAT_ENABLE)
2472 goto done;
2473 return;
2474 }
2475
2476#ifdef CONFIG_USB_SUSPEND
2477 /* If something is connected, but the port is suspended, wake it up. */
2478 if (portstatus & USB_PORT_STAT_SUSPEND) {
2479 status = hub_port_resume(hub, port1, NULL);
2480 if (status < 0) {
2481 dev_dbg(hub_dev,
2482 "can't clear suspend on port %d; %d\n",
2483 port1, status);
2484 goto done;
2485 }
2486 }
2487#endif
2488
2489 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2490 struct usb_device *udev;
2491
2492 /* reallocate for each attempt, since references
2493 * to the previous one can escape in various ways
2494 */
2495 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2496 if (!udev) {
2497 dev_err (hub_dev,
2498 "couldn't allocate port %d usb_device\n",
2499 port1);
2500 goto done;
2501 }
2502
2503 usb_set_device_state(udev, USB_STATE_POWERED);
2504 udev->speed = USB_SPEED_UNKNOWN;
55c52718 2505 udev->bus_mA = hub->mA_per_port;
b6956ffa 2506 udev->level = hdev->level + 1;
55c52718 2507
1da177e4
LT		 2508 /* set the address */
2509 choose_address(udev);
2510 if (udev->devnum <= 0) {
2511 status = -ENOTCONN; /* Don't retry */
2512 goto loop;
2513 }
2514
2515 /* reset and get descriptor */
2516 status = hub_port_init(hub, udev, port1, i);
2517 if (status < 0)
2518 goto loop;
2519
2520 /* consecutive bus-powered hubs aren't reliable; they can
2521 * violate the voltage drop budget. if the new child has
2522 * a "powered" LED, users should notice we didn't enable it
2523 * (without reading syslog), even without per-port LEDs
2524 * on the parent.
2525 */
2526 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
55c52718 2527 && udev->bus_mA <= 100) {
1da177e4
LT		 2528 u16 devstat;
2529
2530 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2531 &devstat);
55c52718 2532 if (status < 2) {
1da177e4
LT		 2533 dev_dbg(&udev->dev, "get status %d ?\n", status);
2534 goto loop_disable;
2535 }
55c52718 2536 le16_to_cpus(&devstat);
1da177e4
LT		 2537 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2538 dev_err(&udev->dev,
2539 "can't connect bus-powered hub "
2540 "to this port\n");
2541 if (hub->has_indicators) {
2542 hub->indicator[port1-1] =
2543 INDICATOR_AMBER_BLINK;
2544 schedule_work (&hub->leds);
2545 }
2546 status = -ENOTCONN; /* Don't retry */
2547 goto loop_disable;
2548 }
2549 }
2550
2551 /* check for devices running slower than they could */
2552 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2553 && udev->speed == USB_SPEED_FULL
2554 && highspeed_hubs != 0)
2555 check_highspeed (hub, udev, port1);
2556
2557 /* Store the parent's children[] pointer. At this point
2558 * udev becomes globally accessible, although presumably
2559 * no one will look at it until hdev is unlocked.
2560 */
1da177e4
LT		 2561 status = 0;
2562
2563 /* We mustn't add new devices if the parent hub has
2564 * been disconnected; we would race with the
2565 * recursively_mark_NOTATTACHED() routine.
2566 */
2567 spin_lock_irq(&device_state_lock);
2568 if (hdev->state == USB_STATE_NOTATTACHED)
2569 status = -ENOTCONN;
2570 else
2571 hdev->children[port1-1] = udev;
2572 spin_unlock_irq(&device_state_lock);
2573
2574 /* Run it through the hoops (find a driver, etc) */
2575 if (!status) {
2576 status = usb_new_device(udev);
2577 if (status) {
2578 spin_lock_irq(&device_state_lock);
2579 hdev->children[port1-1] = NULL;
2580 spin_unlock_irq(&device_state_lock);
2581 }
2582 }
2583
1da177e4
LT		 2584 if (status)
2585 goto loop_disable;
2586
2587 status = hub_power_remaining(hub);
2588 if (status)
55c52718 2589 dev_dbg(hub_dev, "%dmA power budget left\n", status);
1da177e4
LT		 2590
2591 return;
2592
2593loop_disable:
2594 hub_port_disable(hub, port1, 1);
2595loop:
2596 ep0_reinit(udev);
2597 release_address(udev);
2598 usb_put_dev(udev);
2599 if (status == -ENOTCONN)
2600 break;
2601 }
2602
2603done:
2604 hub_port_disable(hub, port1, 1);
2605}
2606
2607static void hub_events(void)
2608{
2609 struct list_head *tmp;
2610 struct usb_device *hdev;
2611 struct usb_interface *intf;
2612 struct usb_hub *hub;
2613 struct device *hub_dev;
2614 u16 hubstatus;
2615 u16 hubchange;
2616 u16 portstatus;
2617 u16 portchange;
2618 int i, ret;
2619 int connect_change;
2620
2621 /*
2622 * We restart the list every time to avoid a deadlock with
2623 * deleting hubs downstream from this one. This should be
2624 * safe since we delete the hub from the event list.
2625 * Not the most efficient, but avoids deadlocks.
2626 */
2627 while (1) {
2628
2629 /* Grab the first entry at the beginning of the list */
2630 spin_lock_irq(&hub_event_lock);
2631 if (list_empty(&hub_event_list)) {
2632 spin_unlock_irq(&hub_event_lock);
2633 break;
2634 }
2635
2636 tmp = hub_event_list.next;
2637 list_del_init(tmp);
2638
2639 hub = list_entry(tmp, struct usb_hub, event_list);
2640 hdev = hub->hdev;
2641 intf = to_usb_interface(hub->intfdev);
2642 hub_dev = &intf->dev;
2643
40f122f3 2644 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
1da177e4
LT		 2645 hdev->state, hub->descriptor
2646 ? hub->descriptor->bNbrPorts
2647 : 0,
2648 /* NOTE: expects max 15 ports... */
2649 (u16) hub->change_bits[0],
40f122f3 2650 (u16) hub->event_bits[0]);
1da177e4
LT		 2651
2652 usb_get_intf(intf);
1da177e4
LT		 2653 spin_unlock_irq(&hub_event_lock);
2654
1da177e4
LT		 2655 /* Lock the device, then check to see if we were
2656 * disconnected while waiting for the lock to succeed. */
2657 if (locktree(hdev) < 0) {
2658 usb_put_intf(intf);
2659 continue;
2660 }
2661 if (hub != usb_get_intfdata(intf))
2662 goto loop;
2663
2664 /* If the hub has died, clean up after it */
2665 if (hdev->state == USB_STATE_NOTATTACHED) {
7de18d8b
AS		 2666 hub->error = -ENODEV;
2667 hub_pre_reset(intf);
1da177e4
LT		 2668 goto loop;
2669 }
2670
40f122f3
AS		 2671 /* Autoresume */
2672 ret = usb_autopm_get_interface(intf);
2673 if (ret) {
2674 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
2675 goto loop;
2676 }
a8e7c565 2677
40f122f3 2678 /* If this is an inactive hub, do nothing */
1da177e4 2679 if (hub->quiescing)
40f122f3 2680 goto loop_autopm;
1da177e4
LT		 2681
2682 if (hub->error) {
2683 dev_dbg (hub_dev, "resetting for error %d\n",
2684 hub->error);
2685
7de18d8b 2686 ret = usb_reset_composite_device(hdev, intf);
1da177e4
LT		 2687 if (ret) {
2688 dev_dbg (hub_dev,
2689 "error resetting hub: %d\n", ret);
40f122f3 2690 goto loop_autopm;
1da177e4
LT		 2691 }
2692
2693 hub->nerrors = 0;
2694 hub->error = 0;
2695 }
2696
2697 /* deal with port status changes */
2698 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2699 if (test_bit(i, hub->busy_bits))
2700 continue;
2701 connect_change = test_bit(i, hub->change_bits);
2702 if (!test_and_clear_bit(i, hub->event_bits) &&
2703 !connect_change && !hub->activating)
2704 continue;
2705
2706 ret = hub_port_status(hub, i,
2707 &portstatus, &portchange);
2708 if (ret < 0)
2709 continue;
2710
2711 if (hub->activating && !hdev->children[i-1] &&
2712 (portstatus &
2713 USB_PORT_STAT_CONNECTION))
2714 connect_change = 1;
2715
2716 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2717 clear_port_feature(hdev, i,
2718 USB_PORT_FEAT_C_CONNECTION);
2719 connect_change = 1;
2720 }
2721
2722 if (portchange & USB_PORT_STAT_C_ENABLE) {
2723 if (!connect_change)
2724 dev_dbg (hub_dev,
2725 "port %d enable change, "
2726 "status %08x\n",
2727 i, portstatus);
2728 clear_port_feature(hdev, i,
2729 USB_PORT_FEAT_C_ENABLE);
2730
2731 /*
2732 * EM interference sometimes causes badly
2733 * shielded USB devices to be shutdown by
2734 * the hub, this hack enables them again.
2735 * Works at least with mouse driver.
2736 */
2737 if (!(portstatus & USB_PORT_STAT_ENABLE)
2738 && !connect_change
2739 && hdev->children[i-1]) {
2740 dev_err (hub_dev,
2741 "port %i "
2742 "disabled by hub (EMI?), "
2743 "re-enabling...\n",
2744 i);
2745 connect_change = 1;
2746 }
2747 }
2748
2749 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2750 clear_port_feature(hdev, i,
2751 USB_PORT_FEAT_C_SUSPEND);
2752 if (hdev->children[i-1]) {
2753 ret = remote_wakeup(hdev->
2754 children[i-1]);
2755 if (ret < 0)
2756 connect_change = 1;
2757 } else {
2758 ret = -ENODEV;
2759 hub_port_disable(hub, i, 1);
2760 }
2761 dev_dbg (hub_dev,
2762 "resume on port %d, status %d\n",
2763 i, ret);
2764 }
2765
2766 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2767 dev_err (hub_dev,
2768 "over-current change on port %d\n",
2769 i);
2770 clear_port_feature(hdev, i,
2771 USB_PORT_FEAT_C_OVER_CURRENT);
2772 hub_power_on(hub);
2773 }
2774
2775 if (portchange & USB_PORT_STAT_C_RESET) {
2776 dev_dbg (hub_dev,
2777 "reset change on port %d\n",
2778 i);
2779 clear_port_feature(hdev, i,
2780 USB_PORT_FEAT_C_RESET);
2781 }
2782
2783 if (connect_change)
2784 hub_port_connect_change(hub, i,
2785 portstatus, portchange);
2786 } /* end for i */
2787
2788 /* deal with hub status changes */
2789 if (test_and_clear_bit(0, hub->event_bits) == 0)
2790 ; /* do nothing */
2791 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2792 dev_err (hub_dev, "get_hub_status failed\n");
2793 else {
2794 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2795 dev_dbg (hub_dev, "power change\n");
2796 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
55c52718
AS		 2797 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2798 /* FIXME: Is this always true? */
2799 hub->limited_power = 0;
2800 else
2801 hub->limited_power = 1;
1da177e4
LT		 2802 }
2803 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2804 dev_dbg (hub_dev, "overcurrent change\n");
2805 msleep(500); /* Cool down */
2806 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2807 hub_power_on(hub);
2808 }
2809 }
2810
2811 hub->activating = 0;
2812
d5926ae7
AS		 2813 /* If this is a root hub, tell the HCD it's okay to
2814 * re-enable port-change interrupts now. */
d5cbad4b 2815 if (!hdev->parent && !hub->busy_bits[0])
d5926ae7
AS		 2816 usb_enable_root_hub_irq(hdev->bus);
2817
40f122f3
AS		 2818loop_autopm:
2819 /* Allow autosuspend if we're not going to run again */
2820 if (list_empty(&hub->event_list))
2821 usb_autopm_enable(intf);
1da177e4
LT		 2822loop:
2823 usb_unlock_device(hdev);
2824 usb_put_intf(intf);
2825
2826 } /* end while (1) */
2827}
2828
2829static int hub_thread(void *__unused)
2830{
1da177e4
LT		 2831 do {
2832 hub_events();
9c8d6178 2833 wait_event_interruptible(khubd_wait,
2834 !list_empty(&hub_event_list) ||
2835 kthread_should_stop());
3e1d1d28 2836 try_to_freeze();
9c8d6178 2837 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
1da177e4 2838
9c8d6178 2839 pr_debug("%s: khubd exiting\n", usbcore_name);
2840 return 0;
1da177e4
LT		 2841}
2842
2843static struct usb_device_id hub_id_table [] = {
2844 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2845 .bDeviceClass = USB_CLASS_HUB},
2846 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2847 .bInterfaceClass = USB_CLASS_HUB},
2848 { } /* Terminating entry */
2849};
2850
2851MODULE_DEVICE_TABLE (usb, hub_id_table);
2852
2853static struct usb_driver hub_driver = {
1da177e4
LT		 2854 .name = "hub",
2855 .probe = hub_probe,
2856 .disconnect = hub_disconnect,
2857 .suspend = hub_suspend,
2858 .resume = hub_resume,
7de18d8b
AS		 2859 .pre_reset = hub_pre_reset,
2860 .post_reset = hub_post_reset,
1da177e4
LT		 2861 .ioctl = hub_ioctl,
2862 .id_table = hub_id_table,
40f122f3 2863 .supports_autosuspend = 1,
1da177e4
LT		 2864};
2865
2866int usb_hub_init(void)
2867{
1da177e4
LT		 2868 if (usb_register(&hub_driver) < 0) {
2869 printk(KERN_ERR "%s: can't register hub driver\n",
2870 usbcore_name);
2871 return -1;
2872 }
2873
9c8d6178 2874 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2875 if (!IS_ERR(khubd_task))
1da177e4 2876 return 0;
1da177e4
LT		 2877
2878 /* Fall through if kernel_thread failed */
2879 usb_deregister(&hub_driver);
2880 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2881
2882 return -1;
2883}
2884
2885void usb_hub_cleanup(void)
2886{
9c8d6178 2887 kthread_stop(khubd_task);
1da177e4
LT		 2888
2889 /*
2890 * Hub resources are freed for us by usb_deregister. It calls
2891 * usb_driver_purge on every device which in turn calls that
2892 * devices disconnect function if it is using this driver.
2893 * The hub_disconnect function takes care of releasing the
2894 * individual hub resources. -greg
2895 */
2896 usb_deregister(&hub_driver);
2897} /* usb_hub_cleanup() */
2898
1da177e4
LT		 2899static int config_descriptors_changed(struct usb_device *udev)
2900{
2901 unsigned index;
2902 unsigned len = 0;
2903 struct usb_config_descriptor *buf;
2904
2905 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2906 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2907 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2908 }
2909 buf = kmalloc (len, SLAB_KERNEL);
2910 if (buf == NULL) {
2911 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2912 /* assume the worst */
2913 return 1;
2914 }
2915 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2916 int length;
2917 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2918
2919 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2920 old_length);
2921 if (length < old_length) {
2922 dev_dbg(&udev->dev, "config index %d, error %d\n",
2923 index, length);
2924 break;
2925 }
2926 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2927 != 0) {
2928 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2929 index, buf->bConfigurationValue);
2930 break;
2931 }
2932 }
2933 kfree(buf);
2934 return index != udev->descriptor.bNumConfigurations;
2935}
2936
2937/**
2938 * usb_reset_device - perform a USB port reset to reinitialize a device
2939 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2940 *
79efa097
AS		 2941 * WARNING - don't use this routine to reset a composite device
2942 * (one with multiple interfaces owned by separate drivers)!
2943 * Use usb_reset_composite_device() instead.
1da177e4
LT		 2944 *
2945 * Do a port reset, reassign the device's address, and establish its
2946 * former operating configuration. If the reset fails, or the device's
2947 * descriptors change from their values before the reset, or the original
2948 * configuration and altsettings cannot be restored, a flag will be set
2949 * telling khubd to pretend the device has been disconnected and then
2950 * re-connected. All drivers will be unbound, and the device will be
2951 * re-enumerated and probed all over again.
2952 *
2953 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2954 * flagged for logical disconnection, or some other negative error code
2955 * if the reset wasn't even attempted.
2956 *
2957 * The caller must own the device lock. For example, it's safe to use
2958 * this from a driver probe() routine after downloading new firmware.
2959 * For calls that might not occur during probe(), drivers should lock
2960 * the device using usb_lock_device_for_reset().
2961 */
2962int usb_reset_device(struct usb_device *udev)
2963{
2964 struct usb_device *parent_hdev = udev->parent;
2965 struct usb_hub *parent_hub;
2966 struct usb_device_descriptor descriptor = udev->descriptor;
12c3da34
AS		 2967 int i, ret = 0;
2968 int port1 = udev->portnum;
1da177e4
LT		 2969
2970 if (udev->state == USB_STATE_NOTATTACHED ||
2971 udev->state == USB_STATE_SUSPENDED) {
2972 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2973 udev->state);
2974 return -EINVAL;
2975 }
2976
2977 if (!parent_hdev) {
2978 /* this requires hcd-specific logic; see OHCI hc_restart() */
2979 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2980 return -EISDIR;
2981 }
1da177e4
LT		 2982 parent_hub = hdev_to_hub(parent_hdev);
2983
1da177e4
LT		 2984 set_bit(port1, parent_hub->busy_bits);
2985 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2986
2987 /* ep0 maxpacket size may change; let the HCD know about it.
2988 * Other endpoints will be handled by re-enumeration. */
2989 ep0_reinit(udev);
2990 ret = hub_port_init(parent_hub, udev, port1, i);
2991 if (ret >= 0)
2992 break;
2993 }
2994 clear_bit(port1, parent_hub->busy_bits);
d5cbad4b
AS		 2995 if (!parent_hdev->parent && !parent_hub->busy_bits[0])
2996 usb_enable_root_hub_irq(parent_hdev->bus);
2997
1da177e4
LT		 2998 if (ret < 0)
2999 goto re_enumerate;
3000
3001 /* Device might have changed firmware (DFU or similar) */
3002 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
3003 || config_descriptors_changed (udev)) {
3004 dev_info(&udev->dev, "device firmware changed\n");
3005 udev->descriptor = descriptor; /* for disconnect() calls */
3006 goto re_enumerate;
3007 }
3008
3009 if (!udev->actconfig)
3010 goto done;
3011
3012 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3013 USB_REQ_SET_CONFIGURATION, 0,
3014 udev->actconfig->desc.bConfigurationValue, 0,
3015 NULL, 0, USB_CTRL_SET_TIMEOUT);
3016 if (ret < 0) {
3017 dev_err(&udev->dev,
3018 "can't restore configuration #%d (error=%d)\n",
3019 udev->actconfig->desc.bConfigurationValue, ret);
3020 goto re_enumerate;
3021 }
3022 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3023
3024 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3025 struct usb_interface *intf = udev->actconfig->interface[i];
3026 struct usb_interface_descriptor *desc;
3027
3028 /* set_interface resets host side toggle even
3029 * for altsetting zero. the interface may have no driver.
3030 */
3031 desc = &intf->cur_altsetting->desc;
3032 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3033 desc->bAlternateSetting);
3034 if (ret < 0) {
3035 dev_err(&udev->dev, "failed to restore interface %d "
3036 "altsetting %d (error=%d)\n",
3037 desc->bInterfaceNumber,
3038 desc->bAlternateSetting,
3039 ret);
3040 goto re_enumerate;
3041 }
3042 }
3043
3044done:
1da177e4
LT		 3045 return 0;
3046
3047re_enumerate:
3048 hub_port_logical_disconnect(parent_hub, port1);
3049 return -ENODEV;
3050}
140d8f68 3051EXPORT_SYMBOL(usb_reset_device);
79efa097
AS		 3052
3053/**
3054 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3055 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3056 * @iface: interface bound to the driver making the request (optional)
3057 *
3058 * Warns all drivers bound to registered interfaces (using their pre_reset
3059 * method), performs the port reset, and then lets the drivers know that
3060 * the reset is over (using their post_reset method).
3061 *
3062 * Return value is the same as for usb_reset_device().
3063 *
3064 * The caller must own the device lock. For example, it's safe to use
3065 * this from a driver probe() routine after downloading new firmware.
3066 * For calls that might not occur during probe(), drivers should lock
3067 * the device using usb_lock_device_for_reset().
3068 *
3069 * The interface locks are acquired during the pre_reset stage and released
3070 * during the post_reset stage. However if iface is not NULL and is
3071 * currently being probed, we assume that the caller already owns its
3072 * lock.
3073 */
3074int usb_reset_composite_device(struct usb_device *udev,
3075 struct usb_interface *iface)
3076{
3077 int ret;
3078 struct usb_host_config *config = udev->actconfig;
3079
3080 if (udev->state == USB_STATE_NOTATTACHED ||
3081 udev->state == USB_STATE_SUSPENDED) {
3082 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3083 udev->state);
3084 return -EINVAL;
3085 }
3086
645daaab
AS		 3087 /* Prevent autosuspend during the reset */
3088 usb_autoresume_device(udev, 1);
3089
79efa097
AS		 3090 if (iface && iface->condition != USB_INTERFACE_BINDING)
3091 iface = NULL;
3092
3093 if (config) {
3094 int i;
3095 struct usb_interface *cintf;
3096 struct usb_driver *drv;
3097
3098 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3099 cintf = config->interface[i];
3100 if (cintf != iface)
3101 down(&cintf->dev.sem);
3102 if (device_is_registered(&cintf->dev) &&
3103 cintf->dev.driver) {
3104 drv = to_usb_driver(cintf->dev.driver);
3105 if (drv->pre_reset)
3106 (drv->pre_reset)(cintf);
3107 }
3108 }
3109 }
3110
3111 ret = usb_reset_device(udev);
3112
3113 if (config) {
3114 int i;
3115 struct usb_interface *cintf;
3116 struct usb_driver *drv;
3117
3118 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3119 cintf = config->interface[i];
3120 if (device_is_registered(&cintf->dev) &&
3121 cintf->dev.driver) {
3122 drv = to_usb_driver(cintf->dev.driver);
3123 if (drv->post_reset)
3124 (drv->post_reset)(cintf);
3125 }
3126 if (cintf != iface)
3127 up(&cintf->dev.sem);
3128 }
3129 }
3130
645daaab 3131 usb_autosuspend_device(udev, 1);
79efa097
AS		 3132 return ret;
3133}
140d8f68 3134EXPORT_SYMBOL(usb_reset_composite_device);
Linux kernel - Deliverables
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