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USB: make usbdevices export their device nodes instead of using a separate class
[mirror_ubuntu-eoan-kernel.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>
7dfb7103 25#include <linux/freezer.h>
1da177e4
LT		 26
27#include <asm/semaphore.h>
28#include <asm/uaccess.h>
29#include <asm/byteorder.h>
30
31#include "usb.h"
32#include "hcd.h"
33#include "hub.h"
34
1bb5f66b
AS		 35struct usb_hub {
36 struct device *intfdev; /* the "interface" device */
37 struct usb_device *hdev;
38 struct urb *urb; /* for interrupt polling pipe */
39
40 /* buffer for urb ... with extra space in case of babble */
41 char (*buffer)[8];
42 dma_addr_t buffer_dma; /* DMA address for buffer */
43 union {
44 struct usb_hub_status hub;
45 struct usb_port_status port;
46 } *status; /* buffer for status reports */
db90e7a1 47 struct mutex status_mutex; /* for the status buffer */
1bb5f66b
AS		 48
49 int error; /* last reported error */
50 int nerrors; /* track consecutive errors */
51
52 struct list_head event_list; /* hubs w/data or errs ready */
53 unsigned long event_bits[1]; /* status change bitmask */
54 unsigned long change_bits[1]; /* ports with logical connect
55 status change */
56 unsigned long busy_bits[1]; /* ports being reset or
57 resumed */
58#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
59#error event_bits[] is too short!
60#endif
61
62 struct usb_hub_descriptor *descriptor; /* class descriptor */
63 struct usb_tt tt; /* Transaction Translator */
64
65 unsigned mA_per_port; /* current for each child */
66
67 unsigned limited_power:1;
68 unsigned quiescing:1;
69 unsigned activating:1;
1bb5f66b
AS		 70
71 unsigned has_indicators:1;
72 u8 indicator[USB_MAXCHILDREN];
6d5aefb8 73 struct delayed_work leds;
1bb5f66b
AS		 74};
75
76
1da177e4 77/* Protect struct usb_device->state and ->children members
9ad3d6cc 78 * Note: Both are also protected by ->dev.sem, except that ->state can
1da177e4
LT		 79 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
80static DEFINE_SPINLOCK(device_state_lock);
81
82/* khubd's worklist and its lock */
83static DEFINE_SPINLOCK(hub_event_lock);
84static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
85
86/* Wakes up khubd */
87static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
88
9c8d6178 89static struct task_struct *khubd_task;
1da177e4
LT		 90
91/* cycle leds on hubs that aren't blinking for attention */
92static int blinkenlights = 0;
93module_param (blinkenlights, bool, S_IRUGO);
94MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
95
96/*
97 * As of 2.6.10 we introduce a new USB device initialization scheme which
98 * closely resembles the way Windows works. Hopefully it will be compatible
99 * with a wider range of devices than the old scheme. However some previously
100 * working devices may start giving rise to "device not accepting address"
101 * errors; if that happens the user can try the old scheme by adjusting the
102 * following module parameters.
103 *
104 * For maximum flexibility there are two boolean parameters to control the
105 * hub driver's behavior. On the first initialization attempt, if the
106 * "old_scheme_first" parameter is set then the old scheme will be used,
107 * otherwise the new scheme is used. If that fails and "use_both_schemes"
108 * is set, then the driver will make another attempt, using the other scheme.
109 */
110static int old_scheme_first = 0;
111module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
112MODULE_PARM_DESC(old_scheme_first,
113 "start with the old device initialization scheme");
114
115static int use_both_schemes = 1;
116module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
117MODULE_PARM_DESC(use_both_schemes,
118 "try the other device initialization scheme if the "
119 "first one fails");
120
121
404d5b18 122static inline char *portspeed(int portstatus)
1da177e4
LT		 123{
124 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
125 return "480 Mb/s";
126 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
127 return "1.5 Mb/s";
128 else
129 return "12 Mb/s";
130}
1da177e4
LT		 131
132/* Note that hdev or one of its children must be locked! */
133static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
134{
135 return usb_get_intfdata(hdev->actconfig->interface[0]);
136}
137
138/* USB 2.0 spec Section 11.24.4.5 */
139static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
140{
141 int i, ret;
142
143 for (i = 0; i < 3; i++) {
144 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
145 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
146 USB_DT_HUB << 8, 0, data, size,
147 USB_CTRL_GET_TIMEOUT);
148 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
149 return ret;
150 }
151 return -EINVAL;
152}
153
154/*
155 * USB 2.0 spec Section 11.24.2.1
156 */
157static int clear_hub_feature(struct usb_device *hdev, int feature)
158{
159 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
160 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
161}
162
163/*
164 * USB 2.0 spec Section 11.24.2.2
165 */
166static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
167{
168 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
169 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
170 NULL, 0, 1000);
171}
172
173/*
174 * USB 2.0 spec Section 11.24.2.13
175 */
176static int set_port_feature(struct usb_device *hdev, int port1, int feature)
177{
178 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
179 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
180 NULL, 0, 1000);
181}
182
183/*
184 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
185 * for info about using port indicators
186 */
187static void set_port_led(
188 struct usb_hub *hub,
189 int port1,
190 int selector
191)
192{
193 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
194 USB_PORT_FEAT_INDICATOR);
195 if (status < 0)
196 dev_dbg (hub->intfdev,
197 "port %d indicator %s status %d\n",
198 port1,
199 ({ char *s; switch (selector) {
200 case HUB_LED_AMBER: s = "amber"; break;
201 case HUB_LED_GREEN: s = "green"; break;
202 case HUB_LED_OFF: s = "off"; break;
203 case HUB_LED_AUTO: s = "auto"; break;
204 default: s = "??"; break;
205 }; s; }),
206 status);
207}
208
209#define LED_CYCLE_PERIOD ((2*HZ)/3)
210
c4028958 211static void led_work (struct work_struct *work)
1da177e4 212{
c4028958
DH		 213 struct usb_hub *hub =
214 container_of(work, struct usb_hub, leds.work);
1da177e4
LT		 215 struct usb_device *hdev = hub->hdev;
216 unsigned i;
217 unsigned changed = 0;
218 int cursor = -1;
219
220 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
221 return;
222
223 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
224 unsigned selector, mode;
225
226 /* 30%-50% duty cycle */
227
228 switch (hub->indicator[i]) {
229 /* cycle marker */
230 case INDICATOR_CYCLE:
231 cursor = i;
232 selector = HUB_LED_AUTO;
233 mode = INDICATOR_AUTO;
234 break;
235 /* blinking green = sw attention */
236 case INDICATOR_GREEN_BLINK:
237 selector = HUB_LED_GREEN;
238 mode = INDICATOR_GREEN_BLINK_OFF;
239 break;
240 case INDICATOR_GREEN_BLINK_OFF:
241 selector = HUB_LED_OFF;
242 mode = INDICATOR_GREEN_BLINK;
243 break;
244 /* blinking amber = hw attention */
245 case INDICATOR_AMBER_BLINK:
246 selector = HUB_LED_AMBER;
247 mode = INDICATOR_AMBER_BLINK_OFF;
248 break;
249 case INDICATOR_AMBER_BLINK_OFF:
250 selector = HUB_LED_OFF;
251 mode = INDICATOR_AMBER_BLINK;
252 break;
253 /* blink green/amber = reserved */
254 case INDICATOR_ALT_BLINK:
255 selector = HUB_LED_GREEN;
256 mode = INDICATOR_ALT_BLINK_OFF;
257 break;
258 case INDICATOR_ALT_BLINK_OFF:
259 selector = HUB_LED_AMBER;
260 mode = INDICATOR_ALT_BLINK;
261 break;
262 default:
263 continue;
264 }
265 if (selector != HUB_LED_AUTO)
266 changed = 1;
267 set_port_led(hub, i + 1, selector);
268 hub->indicator[i] = mode;
269 }
270 if (!changed && blinkenlights) {
271 cursor++;
272 cursor %= hub->descriptor->bNbrPorts;
273 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
274 hub->indicator[cursor] = INDICATOR_CYCLE;
275 changed++;
276 }
277 if (changed)
278 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
279}
280
281/* use a short timeout for hub/port status fetches */
282#define USB_STS_TIMEOUT 1000
283#define USB_STS_RETRIES 5
284
285/*
286 * USB 2.0 spec Section 11.24.2.6
287 */
288static int get_hub_status(struct usb_device *hdev,
289 struct usb_hub_status *data)
290{
291 int i, status = -ETIMEDOUT;
292
293 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
294 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
295 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
296 data, sizeof(*data), USB_STS_TIMEOUT);
297 }
298 return status;
299}
300
301/*
302 * USB 2.0 spec Section 11.24.2.7
303 */
304static int get_port_status(struct usb_device *hdev, int port1,
305 struct usb_port_status *data)
306{
307 int i, status = -ETIMEDOUT;
308
309 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
310 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
311 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
312 data, sizeof(*data), USB_STS_TIMEOUT);
313 }
314 return status;
315}
316
317static void kick_khubd(struct usb_hub *hub)
318{
319 unsigned long flags;
320
40f122f3
AS		 321 /* Suppress autosuspend until khubd runs */
322 to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
323
1da177e4
LT		 324 spin_lock_irqsave(&hub_event_lock, flags);
325 if (list_empty(&hub->event_list)) {
326 list_add_tail(&hub->event_list, &hub_event_list);
327 wake_up(&khubd_wait);
328 }
329 spin_unlock_irqrestore(&hub_event_lock, flags);
330}
331
332void usb_kick_khubd(struct usb_device *hdev)
333{
334 kick_khubd(hdev_to_hub(hdev));
335}
336
337
338/* completion function, fires on port status changes and various faults */
7d12e780 339static void hub_irq(struct urb *urb)
1da177e4 340{
ec17cf1c 341 struct usb_hub *hub = urb->context;
1da177e4
LT		 342 int status;
343 int i;
344 unsigned long bits;
345
346 switch (urb->status) {
347 case -ENOENT: /* synchronous unlink */
348 case -ECONNRESET: /* async unlink */
349 case -ESHUTDOWN: /* hardware going away */
350 return;
351
352 default: /* presumably an error */
353 /* Cause a hub reset after 10 consecutive errors */
354 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
355 if ((++hub->nerrors < 10) || hub->error)
356 goto resubmit;
357 hub->error = urb->status;
358 /* FALL THROUGH */
ec17cf1c 359
1da177e4
LT		 360 /* let khubd handle things */
361 case 0: /* we got data: port status changed */
362 bits = 0;
363 for (i = 0; i < urb->actual_length; ++i)
364 bits |= ((unsigned long) ((*hub->buffer)[i]))
365 << (i*8);
366 hub->event_bits[0] = bits;
367 break;
368 }
369
370 hub->nerrors = 0;
371
372 /* Something happened, let khubd figure it out */
373 kick_khubd(hub);
374
375resubmit:
376 if (hub->quiescing)
377 return;
378
379 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
380 && status != -ENODEV && status != -EPERM)
381 dev_err (hub->intfdev, "resubmit --> %d\n", status);
382}
383
384/* USB 2.0 spec Section 11.24.2.3 */
385static inline int
386hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
387{
388 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
389 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
390 tt, NULL, 0, 1000);
391}
392
393/*
394 * enumeration blocks khubd for a long time. we use keventd instead, since
395 * long blocking there is the exception, not the rule. accordingly, HCDs
396 * talking to TTs must queue control transfers (not just bulk and iso), so
397 * both can talk to the same hub concurrently.
398 */
c4028958 399static void hub_tt_kevent (struct work_struct *work)
1da177e4 400{
c4028958
DH		 401 struct usb_hub *hub =
402 container_of(work, struct usb_hub, tt.kevent);
1da177e4
LT		 403 unsigned long flags;
404
405 spin_lock_irqsave (&hub->tt.lock, flags);
406 while (!list_empty (&hub->tt.clear_list)) {
407 struct list_head *temp;
408 struct usb_tt_clear *clear;
409 struct usb_device *hdev = hub->hdev;
410 int status;
411
412 temp = hub->tt.clear_list.next;
413 clear = list_entry (temp, struct usb_tt_clear, clear_list);
414 list_del (&clear->clear_list);
415
416 /* drop lock so HCD can concurrently report other TT errors */
417 spin_unlock_irqrestore (&hub->tt.lock, flags);
418 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
419 spin_lock_irqsave (&hub->tt.lock, flags);
420
421 if (status)
422 dev_err (&hdev->dev,
423 "clear tt %d (%04x) error %d\n",
424 clear->tt, clear->devinfo, status);
1bc3c9e1 425 kfree(clear);
1da177e4
LT		 426 }
427 spin_unlock_irqrestore (&hub->tt.lock, flags);
428}
429
430/**
431 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
432 * @udev: the device whose split transaction failed
433 * @pipe: identifies the endpoint of the failed transaction
434 *
435 * High speed HCDs use this to tell the hub driver that some split control or
436 * bulk transaction failed in a way that requires clearing internal state of
437 * a transaction translator. This is normally detected (and reported) from
438 * interrupt context.
439 *
440 * It may not be possible for that hub to handle additional full (or low)
441 * speed transactions until that state is fully cleared out.
442 */
443void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
444{
445 struct usb_tt *tt = udev->tt;
446 unsigned long flags;
447 struct usb_tt_clear *clear;
448
449 /* we've got to cope with an arbitrary number of pending TT clears,
450 * since each TT has "at least two" buffers that can need it (and
451 * there can be many TTs per hub). even if they're uncommon.
452 */
54e6ecb2 453 if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
1da177e4
LT		 454 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
455 /* FIXME recover somehow ... RESET_TT? */
456 return;
457 }
458
459 /* info that CLEAR_TT_BUFFER needs */
460 clear->tt = tt->multi ? udev->ttport : 1;
461 clear->devinfo = usb_pipeendpoint (pipe);
462 clear->devinfo |= udev->devnum << 4;
463 clear->devinfo |= usb_pipecontrol (pipe)
464 ? (USB_ENDPOINT_XFER_CONTROL << 11)
465 : (USB_ENDPOINT_XFER_BULK << 11);
466 if (usb_pipein (pipe))
467 clear->devinfo |= 1 << 15;
468
469 /* tell keventd to clear state for this TT */
470 spin_lock_irqsave (&tt->lock, flags);
471 list_add_tail (&clear->clear_list, &tt->clear_list);
472 schedule_work (&tt->kevent);
473 spin_unlock_irqrestore (&tt->lock, flags);
474}
475
476static void hub_power_on(struct usb_hub *hub)
477{
478 int port1;
b789696a 479 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
4489a571
AS		 480 u16 wHubCharacteristics =
481 le16_to_cpu(hub->descriptor->wHubCharacteristics);
482
483 /* Enable power on each port. Some hubs have reserved values
484 * of LPSM (> 2) in their descriptors, even though they are
485 * USB 2.0 hubs. Some hubs do not implement port-power switching
486 * but only emulate it. In all cases, the ports won't work
487 * unless we send these messages to the hub.
488 */
489 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
1da177e4 490 dev_dbg(hub->intfdev, "enabling power on all ports\n");
4489a571
AS		 491 else
492 dev_dbg(hub->intfdev, "trying to enable port power on "
493 "non-switchable hub\n");
494 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
495 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
1da177e4 496
b789696a
DB		 497 /* Wait at least 100 msec for power to become stable */
498 msleep(max(pgood_delay, (unsigned) 100));
1da177e4
LT		 499}
500
02c399ee 501static void hub_quiesce(struct usb_hub *hub)
1da177e4 502{
979d5199 503 /* (nonblocking) khubd and related activity won't re-trigger */
1da177e4 504 hub->quiescing = 1;
c9f89fa4 505 hub->activating = 0;
979d5199 506
979d5199 507 /* (blocking) stop khubd and related activity */
1da177e4
LT		 508 usb_kill_urb(hub->urb);
509 if (hub->has_indicators)
510 cancel_delayed_work(&hub->leds);
511 if (hub->has_indicators || hub->tt.hub)
512 flush_scheduled_work();
513}
514
515static void hub_activate(struct usb_hub *hub)
516{
517 int status;
518
519 hub->quiescing = 0;
520 hub->activating = 1;
40f122f3 521
1da177e4
LT		 522 status = usb_submit_urb(hub->urb, GFP_NOIO);
523 if (status < 0)
524 dev_err(hub->intfdev, "activate --> %d\n", status);
525 if (hub->has_indicators && blinkenlights)
526 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
527
528 /* scan all ports ASAP */
529 kick_khubd(hub);
530}
531
532static int hub_hub_status(struct usb_hub *hub,
533 u16 *status, u16 *change)
534{
535 int ret;
536
db90e7a1 537 mutex_lock(&hub->status_mutex);
1da177e4
LT		 538 ret = get_hub_status(hub->hdev, &hub->status->hub);
539 if (ret < 0)
540 dev_err (hub->intfdev,
541 "%s failed (err = %d)\n", __FUNCTION__, ret);
542 else {
543 *status = le16_to_cpu(hub->status->hub.wHubStatus);
544 *change = le16_to_cpu(hub->status->hub.wHubChange);
545 ret = 0;
546 }
db90e7a1 547 mutex_unlock(&hub->status_mutex);
1da177e4
LT		 548 return ret;
549}
550
8b28c752
AS		 551static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
552{
553 struct usb_device *hdev = hub->hdev;
554 int ret;
555
556 if (hdev->children[port1-1] && set_state) {
557 usb_set_device_state(hdev->children[port1-1],
558 USB_STATE_NOTATTACHED);
559 }
560 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
561 if (ret)
562 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
563 port1, ret);
564
565 return ret;
566}
567
7d069b7d
AS		 568
569/* caller has locked the hub device */
7de18d8b 570static void hub_pre_reset(struct usb_interface *intf)
7d069b7d 571{
7de18d8b 572 struct usb_hub *hub = usb_get_intfdata(intf);
7d069b7d
AS		 573 struct usb_device *hdev = hub->hdev;
574 int port1;
575
576 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
577 if (hdev->children[port1 - 1]) {
578 usb_disconnect(&hdev->children[port1 - 1]);
7de18d8b 579 if (hub->error == 0)
7d069b7d
AS		 580 hub_port_disable(hub, port1, 0);
581 }
582 }
583 hub_quiesce(hub);
584}
585
586/* caller has locked the hub device */
7de18d8b 587static void hub_post_reset(struct usb_interface *intf)
7d069b7d 588{
7de18d8b
AS		 589 struct usb_hub *hub = usb_get_intfdata(intf);
590
7d069b7d
AS		 591 hub_activate(hub);
592 hub_power_on(hub);
593}
594
595
1da177e4
LT		 596static int hub_configure(struct usb_hub *hub,
597 struct usb_endpoint_descriptor *endpoint)
598{
599 struct usb_device *hdev = hub->hdev;
600 struct device *hub_dev = hub->intfdev;
601 u16 hubstatus, hubchange;
74ad9bd2 602 u16 wHubCharacteristics;
1da177e4
LT		 603 unsigned int pipe;
604 int maxp, ret;
605 char *message;
606
607 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
608 &hub->buffer_dma);
609 if (!hub->buffer) {
610 message = "can't allocate hub irq buffer";
611 ret = -ENOMEM;
612 goto fail;
613 }
614
615 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
616 if (!hub->status) {
617 message = "can't kmalloc hub status buffer";
618 ret = -ENOMEM;
619 goto fail;
620 }
db90e7a1 621 mutex_init(&hub->status_mutex);
1da177e4
LT		 622
623 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
624 if (!hub->descriptor) {
625 message = "can't kmalloc hub descriptor";
626 ret = -ENOMEM;
627 goto fail;
628 }
629
630 /* Request the entire hub descriptor.
631 * hub->descriptor can handle USB_MAXCHILDREN ports,
632 * but the hub can/will return fewer bytes here.
633 */
634 ret = get_hub_descriptor(hdev, hub->descriptor,
635 sizeof(*hub->descriptor));
636 if (ret < 0) {
637 message = "can't read hub descriptor";
638 goto fail;
639 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
640 message = "hub has too many ports!";
641 ret = -ENODEV;
642 goto fail;
643 }
644
645 hdev->maxchild = hub->descriptor->bNbrPorts;
646 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
647 (hdev->maxchild == 1) ? "" : "s");
648
74ad9bd2 649 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4 650
74ad9bd2 651 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
1da177e4
LT		 652 int i;
653 char portstr [USB_MAXCHILDREN + 1];
654
655 for (i = 0; i < hdev->maxchild; i++)
656 portstr[i] = hub->descriptor->DeviceRemovable
657 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
658 ? 'F' : 'R';
659 portstr[hdev->maxchild] = 0;
660 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
661 } else
662 dev_dbg(hub_dev, "standalone hub\n");
663
74ad9bd2 664 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1da177e4
LT		 665 case 0x00:
666 dev_dbg(hub_dev, "ganged power switching\n");
667 break;
668 case 0x01:
669 dev_dbg(hub_dev, "individual port power switching\n");
670 break;
671 case 0x02:
672 case 0x03:
673 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
674 break;
675 }
676
74ad9bd2 677 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1da177e4
LT		 678 case 0x00:
679 dev_dbg(hub_dev, "global over-current protection\n");
680 break;
681 case 0x08:
682 dev_dbg(hub_dev, "individual port over-current protection\n");
683 break;
684 case 0x10:
685 case 0x18:
686 dev_dbg(hub_dev, "no over-current protection\n");
687 break;
688 }
689
690 spin_lock_init (&hub->tt.lock);
691 INIT_LIST_HEAD (&hub->tt.clear_list);
c4028958 692 INIT_WORK (&hub->tt.kevent, hub_tt_kevent);
1da177e4
LT		 693 switch (hdev->descriptor.bDeviceProtocol) {
694 case 0:
695 break;
696 case 1:
697 dev_dbg(hub_dev, "Single TT\n");
698 hub->tt.hub = hdev;
699 break;
700 case 2:
701 ret = usb_set_interface(hdev, 0, 1);
702 if (ret == 0) {
703 dev_dbg(hub_dev, "TT per port\n");
704 hub->tt.multi = 1;
705 } else
706 dev_err(hub_dev, "Using single TT (err %d)\n",
707 ret);
708 hub->tt.hub = hdev;
709 break;
710 default:
711 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
712 hdev->descriptor.bDeviceProtocol);
713 break;
714 }
715
e09711ae 716 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
74ad9bd2 717 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
e09711ae
DB		 718 case HUB_TTTT_8_BITS:
719 if (hdev->descriptor.bDeviceProtocol != 0) {
720 hub->tt.think_time = 666;
721 dev_dbg(hub_dev, "TT requires at most %d "
722 "FS bit times (%d ns)\n",
723 8, hub->tt.think_time);
724 }
1da177e4 725 break;
e09711ae
DB		 726 case HUB_TTTT_16_BITS:
727 hub->tt.think_time = 666 * 2;
728 dev_dbg(hub_dev, "TT requires at most %d "
729 "FS bit times (%d ns)\n",
730 16, hub->tt.think_time);
1da177e4 731 break;
e09711ae
DB		 732 case HUB_TTTT_24_BITS:
733 hub->tt.think_time = 666 * 3;
734 dev_dbg(hub_dev, "TT requires at most %d "
735 "FS bit times (%d ns)\n",
736 24, hub->tt.think_time);
1da177e4 737 break;
e09711ae
DB		 738 case HUB_TTTT_32_BITS:
739 hub->tt.think_time = 666 * 4;
740 dev_dbg(hub_dev, "TT requires at most %d "
741 "FS bit times (%d ns)\n",
742 32, hub->tt.think_time);
1da177e4
LT		 743 break;
744 }
745
746 /* probe() zeroes hub->indicator[] */
74ad9bd2 747 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1da177e4
LT		 748 hub->has_indicators = 1;
749 dev_dbg(hub_dev, "Port indicators are supported\n");
750 }
751
752 dev_dbg(hub_dev, "power on to power good time: %dms\n",
753 hub->descriptor->bPwrOn2PwrGood * 2);
754
755 /* power budgeting mostly matters with bus-powered hubs,
756 * and battery-powered root hubs (may provide just 8 mA).
757 */
758 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
55c52718 759 if (ret < 2) {
1da177e4
LT		 760 message = "can't get hub status";
761 goto fail;
762 }
7d35b929
AS		 763 le16_to_cpus(&hubstatus);
764 if (hdev == hdev->bus->root_hub) {
55c52718
AS		 765 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
766 hub->mA_per_port = 500;
767 else {
768 hub->mA_per_port = hdev->bus_mA;
769 hub->limited_power = 1;
770 }
7d35b929 771 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1da177e4
LT		 772 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
773 hub->descriptor->bHubContrCurrent);
55c52718
AS		 774 hub->limited_power = 1;
775 if (hdev->maxchild > 0) {
776 int remaining = hdev->bus_mA -
777 hub->descriptor->bHubContrCurrent;
778
779 if (remaining < hdev->maxchild * 100)
780 dev_warn(hub_dev,
781 "insufficient power available "
782 "to use all downstream ports\n");
783 hub->mA_per_port = 100; /* 7.2.1.1 */
784 }
785 } else { /* Self-powered external hub */
786 /* FIXME: What about battery-powered external hubs that
787 * provide less current per port? */
788 hub->mA_per_port = 500;
7d35b929 789 }
55c52718
AS		 790 if (hub->mA_per_port < 500)
791 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
792 hub->mA_per_port);
1da177e4
LT		 793
794 ret = hub_hub_status(hub, &hubstatus, &hubchange);
795 if (ret < 0) {
796 message = "can't get hub status";
797 goto fail;
798 }
799
800 /* local power status reports aren't always correct */
801 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
802 dev_dbg(hub_dev, "local power source is %s\n",
803 (hubstatus & HUB_STATUS_LOCAL_POWER)
804 ? "lost (inactive)" : "good");
805
74ad9bd2 806 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1da177e4
LT		 807 dev_dbg(hub_dev, "%sover-current condition exists\n",
808 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
809
88fafff9 810 /* set up the interrupt endpoint
811 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
812 * bytes as USB2.0[11.12.3] says because some hubs are known
813 * to send more data (and thus cause overflow). For root hubs,
814 * maxpktsize is defined in hcd.c's fake endpoint descriptors
815 * to be big enough for at least USB_MAXCHILDREN ports. */
1da177e4
LT		 816 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
817 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
818
819 if (maxp > sizeof(*hub->buffer))
820 maxp = sizeof(*hub->buffer);
821
822 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
823 if (!hub->urb) {
824 message = "couldn't allocate interrupt urb";
825 ret = -ENOMEM;
826 goto fail;
827 }
828
829 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
830 hub, endpoint->bInterval);
831 hub->urb->transfer_dma = hub->buffer_dma;
832 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
833
834 /* maybe cycle the hub leds */
835 if (hub->has_indicators && blinkenlights)
836 hub->indicator [0] = INDICATOR_CYCLE;
837
838 hub_power_on(hub);
839 hub_activate(hub);
840 return 0;
841
842fail:
843 dev_err (hub_dev, "config failed, %s (err %d)\n",
844 message, ret);
845 /* hub_disconnect() frees urb and descriptor */
846 return ret;
847}
848
849static unsigned highspeed_hubs;
850
851static void hub_disconnect(struct usb_interface *intf)
852{
853 struct usb_hub *hub = usb_get_intfdata (intf);
854 struct usb_device *hdev;
855
7de18d8b
AS		 856 /* Disconnect all children and quiesce the hub */
857 hub->error = 0;
858 hub_pre_reset(intf);
859
8b28c752 860 usb_set_intfdata (intf, NULL);
1da177e4
LT		 861 hdev = hub->hdev;
862
863 if (hdev->speed == USB_SPEED_HIGH)
864 highspeed_hubs--;
865
1da177e4
LT		 866 usb_free_urb(hub->urb);
867 hub->urb = NULL;
868
869 spin_lock_irq(&hub_event_lock);
870 list_del_init(&hub->event_list);
871 spin_unlock_irq(&hub_event_lock);
872
1bc3c9e1
JJ		 873 kfree(hub->descriptor);
874 hub->descriptor = NULL;
1da177e4 875
1bc3c9e1
JJ		 876 kfree(hub->status);
877 hub->status = NULL;
1da177e4
LT		 878
879 if (hub->buffer) {
880 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
881 hub->buffer_dma);
882 hub->buffer = NULL;
883 }
884
7d069b7d 885 kfree(hub);
1da177e4
LT		 886}
887
888static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
889{
890 struct usb_host_interface *desc;
891 struct usb_endpoint_descriptor *endpoint;
892 struct usb_device *hdev;
893 struct usb_hub *hub;
894
895 desc = intf->cur_altsetting;
896 hdev = interface_to_usbdev(intf);
897
89ccbdc9
DB		 898#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
899 if (hdev->parent) {
900 dev_warn(&intf->dev, "ignoring external hub\n");
901 return -ENODEV;
902 }
903#endif
904
1da177e4
LT		 905 /* Some hubs have a subclass of 1, which AFAICT according to the */
906 /* specs is not defined, but it works */
907 if ((desc->desc.bInterfaceSubClass != 0) &&
908 (desc->desc.bInterfaceSubClass != 1)) {
909descriptor_error:
910 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
911 return -EIO;
912 }
913
914 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
915 if (desc->desc.bNumEndpoints != 1)
916 goto descriptor_error;
917
918 endpoint = &desc->endpoint[0].desc;
919
fbf81c29
LFC		 920 /* If it's not an interrupt in endpoint, we'd better punt! */
921 if (!usb_endpoint_is_int_in(endpoint))
1da177e4
LT		 922 goto descriptor_error;
923
924 /* We found a hub */
925 dev_info (&intf->dev, "USB hub found\n");
926
0a1ef3b5 927 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1da177e4
LT		 928 if (!hub) {
929 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
930 return -ENOMEM;
931 }
932
1da177e4
LT		 933 INIT_LIST_HEAD(&hub->event_list);
934 hub->intfdev = &intf->dev;
935 hub->hdev = hdev;
c4028958 936 INIT_DELAYED_WORK(&hub->leds, led_work);
1da177e4
LT		 937
938 usb_set_intfdata (intf, hub);
40f122f3 939 intf->needs_remote_wakeup = 1;
1da177e4
LT		 940
941 if (hdev->speed == USB_SPEED_HIGH)
942 highspeed_hubs++;
943
944 if (hub_configure(hub, endpoint) >= 0)
945 return 0;
946
947 hub_disconnect (intf);
948 return -ENODEV;
949}
950
951static int
952hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
953{
954 struct usb_device *hdev = interface_to_usbdev (intf);
955
956 /* assert ifno == 0 (part of hub spec) */
957 switch (code) {
958 case USBDEVFS_HUB_PORTINFO: {
959 struct usbdevfs_hub_portinfo *info = user_data;
960 int i;
961
962 spin_lock_irq(&device_state_lock);
963 if (hdev->devnum <= 0)
964 info->nports = 0;
965 else {
966 info->nports = hdev->maxchild;
967 for (i = 0; i < info->nports; i++) {
968 if (hdev->children[i] == NULL)
969 info->port[i] = 0;
970 else
971 info->port[i] =
972 hdev->children[i]->devnum;
973 }
974 }
975 spin_unlock_irq(&device_state_lock);
976
977 return info->nports + 1;
978 }
979
980 default:
981 return -ENOSYS;
982 }
983}
984
1da177e4
LT		 985
986/* grab device/port lock, returning index of that port (zero based).
987 * protects the upstream link used by this device from concurrent
988 * tree operations like suspend, resume, reset, and disconnect, which
989 * apply to everything downstream of a given port.
990 */
991static int locktree(struct usb_device *udev)
992{
993 int t;
994 struct usb_device *hdev;
995
996 if (!udev)
997 return -ENODEV;
998
999 /* root hub is always the first lock in the series */
1000 hdev = udev->parent;
1001 if (!hdev) {
1002 usb_lock_device(udev);
1003 return 0;
1004 }
1005
1006 /* on the path from root to us, lock everything from
1007 * top down, dropping parent locks when not needed
1008 */
1009 t = locktree(hdev);
1010 if (t < 0)
1011 return t;
1da177e4 1012
12c3da34
AS		 1013 /* everything is fail-fast once disconnect
1014 * processing starts
1015 */
1016 if (udev->state == USB_STATE_NOTATTACHED) {
1017 usb_unlock_device(hdev);
1018 return -ENODEV;
1da177e4 1019 }
12c3da34
AS		 1020
1021 /* when everyone grabs locks top->bottom,
1022 * non-overlapping work may be concurrent
1023 */
1024 usb_lock_device(udev);
1da177e4 1025 usb_unlock_device(hdev);
12c3da34 1026 return udev->portnum;
1da177e4
LT		 1027}
1028
1029static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1030{
1031 int i;
1032
1033 for (i = 0; i < udev->maxchild; ++i) {
1034 if (udev->children[i])
1035 recursively_mark_NOTATTACHED(udev->children[i]);
1036 }
ee49fb5d
AS		 1037 if (udev->state == USB_STATE_SUSPENDED)
1038 udev->discon_suspended = 1;
1da177e4
LT		 1039 udev->state = USB_STATE_NOTATTACHED;
1040}
1041
1042/**
1043 * usb_set_device_state - change a device's current state (usbcore, hcds)
1044 * @udev: pointer to device whose state should be changed
1045 * @new_state: new state value to be stored
1046 *
1047 * udev->state is _not_ fully protected by the device lock. Although
1048 * most transitions are made only while holding the lock, the state can
1049 * can change to USB_STATE_NOTATTACHED at almost any time. This
1050 * is so that devices can be marked as disconnected as soon as possible,
1051 * without having to wait for any semaphores to be released. As a result,
1052 * all changes to any device's state must be protected by the
1053 * device_state_lock spinlock.
1054 *
1055 * Once a device has been added to the device tree, all changes to its state
1056 * should be made using this routine. The state should _not_ be set directly.
1057 *
1058 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1059 * Otherwise udev->state is set to new_state, and if new_state is
1060 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1061 * to USB_STATE_NOTATTACHED.
1062 */
1063void usb_set_device_state(struct usb_device *udev,
1064 enum usb_device_state new_state)
1065{
1066 unsigned long flags;
1067
1068 spin_lock_irqsave(&device_state_lock, flags);
1069 if (udev->state == USB_STATE_NOTATTACHED)
1070 ; /* do nothing */
b94dc6b5 1071 else if (new_state != USB_STATE_NOTATTACHED) {
fb669cc0
DB		 1072
1073 /* root hub wakeup capabilities are managed out-of-band
1074 * and may involve silicon errata ... ignore them here.
1075 */
1076 if (udev->parent) {
645daaab
AS		 1077 if (udev->state == USB_STATE_SUSPENDED
1078 || new_state == USB_STATE_SUSPENDED)
1079 ; /* No change to wakeup settings */
1080 else if (new_state == USB_STATE_CONFIGURED)
fb669cc0
DB		 1081 device_init_wakeup(&udev->dev,
1082 (udev->actconfig->desc.bmAttributes
1083 & USB_CONFIG_ATT_WAKEUP));
645daaab 1084 else
fb669cc0
DB		 1085 device_init_wakeup(&udev->dev, 0);
1086 }
645daaab 1087 udev->state = new_state;
b94dc6b5 1088 } else
1da177e4
LT		 1089 recursively_mark_NOTATTACHED(udev);
1090 spin_unlock_irqrestore(&device_state_lock, flags);
1091}
1da177e4
LT		 1092
1093
d388dab7 1094#ifdef CONFIG_PM
1c50c317
AS		 1095
1096/**
1097 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1098 * @rhdev: struct usb_device for the root hub
1099 *
1100 * The USB host controller driver calls this function when its root hub
1101 * is resumed and Vbus power has been interrupted or the controller
1102 * has been reset. The routine marks all the children of the root hub
1103 * as NOTATTACHED and marks logical connect-change events on their ports.
1104 */
1105void usb_root_hub_lost_power(struct usb_device *rhdev)
1106{
1107 struct usb_hub *hub;
1108 int port1;
1109 unsigned long flags;
1110
1111 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
353a4098
AS		 1112
1113 /* Make sure no potential wakeup events get lost,
1114 * by forcing the root hub to be resumed.
1115 */
1116 rhdev->dev.power.prev_state.event = PM_EVENT_ON;
1117
1c50c317
AS		 1118 spin_lock_irqsave(&device_state_lock, flags);
1119 hub = hdev_to_hub(rhdev);
1120 for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
1121 if (rhdev->children[port1 - 1]) {
1122 recursively_mark_NOTATTACHED(
1123 rhdev->children[port1 - 1]);
1124 set_bit(port1, hub->change_bits);
1125 }
1126 }
1127 spin_unlock_irqrestore(&device_state_lock, flags);
1128}
1129EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1130
d388dab7 1131#endif /* CONFIG_PM */
1c50c317 1132
1da177e4
LT		 1133static void choose_address(struct usb_device *udev)
1134{
1135 int devnum;
1136 struct usb_bus *bus = udev->bus;
1137
1138 /* If khubd ever becomes multithreaded, this will need a lock */
1139
1140 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1141 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1142 bus->devnum_next);
1143 if (devnum >= 128)
1144 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1145
1146 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1147
1148 if (devnum < 128) {
1149 set_bit(devnum, bus->devmap.devicemap);
1150 udev->devnum = devnum;
1151 }
1152}
1153
1154static void release_address(struct usb_device *udev)
1155{
1156 if (udev->devnum > 0) {
1157 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1158 udev->devnum = -1;
1159 }
1160}
1161
1162/**
1163 * usb_disconnect - disconnect a device (usbcore-internal)
1164 * @pdev: pointer to device being disconnected
1165 * Context: !in_interrupt ()
1166 *
1167 * Something got disconnected. Get rid of it and all of its children.
1168 *
1169 * If *pdev is a normal device then the parent hub must already be locked.
1170 * If *pdev is a root hub then this routine will acquire the
1171 * usb_bus_list_lock on behalf of the caller.
1172 *
1173 * Only hub drivers (including virtual root hub drivers for host
1174 * controllers) should ever call this.
1175 *
1176 * This call is synchronous, and may not be used in an interrupt context.
1177 */
1178void usb_disconnect(struct usb_device **pdev)
1179{
1180 struct usb_device *udev = *pdev;
1181 int i;
1182
1183 if (!udev) {
1184 pr_debug ("%s nodev\n", __FUNCTION__);
1185 return;
1186 }
1187
1188 /* mark the device as inactive, so any further urb submissions for
1189 * this device (and any of its children) will fail immediately.
1190 * this quiesces everyting except pending urbs.
1191 */
1192 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1da177e4
LT		 1193 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1194
9ad3d6cc
AS		 1195 usb_lock_device(udev);
1196
1da177e4
LT		 1197 /* Free up all the children before we remove this device */
1198 for (i = 0; i < USB_MAXCHILDREN; i++) {
1199 if (udev->children[i])
1200 usb_disconnect(&udev->children[i]);
1201 }
1202
1203 /* deallocate hcd/hardware state ... nuking all pending urbs and
1204 * cleaning up all state associated with the current configuration
1205 * so that the hardware is now fully quiesced.
1206 */
782da727 1207 dev_dbg (&udev->dev, "unregistering device\n");
1da177e4
LT		 1208 usb_disable_device(udev, 0);
1209
782da727
AS		 1210 usb_unlock_device(udev);
1211
1212 /* Unregister the device. The device driver is responsible
1213 * for removing the device files from usbfs and sysfs and for
1214 * de-configuring the device.
1215 */
1216 device_del(&udev->dev);
3099e75a 1217
782da727 1218 /* Free the device number and delete the parent's children[]
1da177e4
LT		 1219 * (or root_hub) pointer.
1220 */
1da177e4 1221 release_address(udev);
1da177e4
LT		 1222
1223 /* Avoid races with recursively_mark_NOTATTACHED() */
1224 spin_lock_irq(&device_state_lock);
1225 *pdev = NULL;
1226 spin_unlock_irq(&device_state_lock);
1227
ee49fb5d
AS		 1228 /* Decrement the parent's count of unsuspended children */
1229 if (udev->parent) {
1230 usb_pm_lock(udev);
1231 if (!udev->discon_suspended)
94fcda1f 1232 usb_autosuspend_device(udev->parent);
ee49fb5d
AS		 1233 usb_pm_unlock(udev);
1234 }
1235
782da727 1236 put_device(&udev->dev);
1da177e4
LT		 1237}
1238
1239#ifdef DEBUG
1240static void show_string(struct usb_device *udev, char *id, char *string)
1241{
1242 if (!string)
1243 return;
1244 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1245}
1246
1247#else
1248static inline void show_string(struct usb_device *udev, char *id, char *string)
1249{}
1250#endif
1251
1da177e4
LT		 1252
1253#ifdef CONFIG_USB_OTG
1254#include "otg_whitelist.h"
11bd44ab 1255static int __usb_port_suspend(struct usb_device *, int port1);
1da177e4
LT		 1256#endif
1257
3ede760f
ON		 1258/**
1259 * usb_new_device - perform initial device setup (usbcore-internal)
1260 * @udev: newly addressed device (in ADDRESS state)
1261 *
1262 * This is called with devices which have been enumerated, but not yet
1263 * configured. The device descriptor is available, but not descriptors
1264 * for any device configuration. The caller must have locked either
1265 * the parent hub (if udev is a normal device) or else the
1266 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1267 * udev has already been installed, but udev is not yet visible through
1268 * sysfs or other filesystem code.
1269 *
1270 * It will return if the device is configured properly or not. Zero if
1271 * the interface was registered with the driver core; else a negative
1272 * errno value.
1273 *
1274 * This call is synchronous, and may not be used in an interrupt context.
1275 *
1276 * Only the hub driver or root-hub registrar should ever call this.
1277 */
1278int usb_new_device(struct usb_device *udev)
1da177e4
LT		 1279{
1280 int err;
1da177e4 1281
7ceec1f1
ON		 1282 /* Determine quirks */
1283 usb_detect_quirks(udev);
1284
1da177e4
LT		 1285 err = usb_get_configuration(udev);
1286 if (err < 0) {
1287 dev_err(&udev->dev, "can't read configurations, error %d\n",
1288 err);
1289 goto fail;
1290 }
1291
1292 /* read the standard strings and cache them if present */
4f62efe6
AS		 1293 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1294 udev->manufacturer = usb_cache_string(udev,
1295 udev->descriptor.iManufacturer);
1296 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1da177e4
LT		 1297
1298 /* Tell the world! */
1299 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1300 "SerialNumber=%d\n",
1301 udev->descriptor.iManufacturer,
1302 udev->descriptor.iProduct,
1303 udev->descriptor.iSerialNumber);
1304 show_string(udev, "Product", udev->product);
1305 show_string(udev, "Manufacturer", udev->manufacturer);
1306 show_string(udev, "SerialNumber", udev->serial);
1307
1308#ifdef CONFIG_USB_OTG
1309 /*
1310 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1311 * to wake us after we've powered off VBUS; and HNP, switching roles
1312 * "host" to "peripheral". The OTG descriptor helps figure this out.
1313 */
1314 if (!udev->bus->is_b_host
1315 && udev->config
1316 && udev->parent == udev->bus->root_hub) {
1317 struct usb_otg_descriptor *desc = 0;
1318 struct usb_bus *bus = udev->bus;
1319
1320 /* descriptor may appear anywhere in config */
1321 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1322 le16_to_cpu(udev->config[0].desc.wTotalLength),
1323 USB_DT_OTG, (void **) &desc) == 0) {
1324 if (desc->bmAttributes & USB_OTG_HNP) {
12c3da34 1325 unsigned port1 = udev->portnum;
fc849b85 1326
1da177e4
LT		 1327 dev_info(&udev->dev,
1328 "Dual-Role OTG device on %sHNP port\n",
1329 (port1 == bus->otg_port)
1330 ? "" : "non-");
1331
1332 /* enable HNP before suspend, it's simpler */
1333 if (port1 == bus->otg_port)
1334 bus->b_hnp_enable = 1;
1335 err = usb_control_msg(udev,
1336 usb_sndctrlpipe(udev, 0),
1337 USB_REQ_SET_FEATURE, 0,
1338 bus->b_hnp_enable
1339 ? USB_DEVICE_B_HNP_ENABLE
1340 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1341 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1342 if (err < 0) {
1343 /* OTG MESSAGE: report errors here,
1344 * customize to match your product.
1345 */
1346 dev_info(&udev->dev,
1347 "can't set HNP mode; %d\n",
1348 err);
1349 bus->b_hnp_enable = 0;
1350 }
1351 }
1352 }
1353 }
1354
1355 if (!is_targeted(udev)) {
1356
1357 /* Maybe it can talk to us, though we can't talk to it.
1358 * (Includes HNP test device.)
1359 */
1360 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
140d8f68 1361 err = __usb_port_suspend(udev, udev->bus->otg_port);
1da177e4
LT		 1362 if (err < 0)
1363 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1364 }
1365 err = -ENODEV;
1366 goto fail;
1367 }
1368#endif
1369
9f8b17e6
KS		 1370 /* export the usbdev device-node for libusb */
1371 udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
1372 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1373
782da727 1374 /* Register the device. The device driver is responsible
9f8b17e6
KS		 1375 * for adding the device files to sysfs and for configuring
1376 * the device.
782da727 1377 */
9f8b17e6 1378 err = device_add(&udev->dev);
1da177e4
LT		 1379 if (err) {
1380 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1381 goto fail;
1382 }
9ad3d6cc 1383
ee49fb5d
AS		 1384 /* Increment the parent's count of unsuspended children */
1385 if (udev->parent)
94fcda1f 1386 usb_autoresume_device(udev->parent);
ee49fb5d 1387
c066475e 1388exit:
c066475e 1389 return err;
1da177e4
LT		 1390
1391fail:
1392 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
c066475e 1393 goto exit;
1da177e4
LT		 1394}
1395
1da177e4
LT		 1396static int hub_port_status(struct usb_hub *hub, int port1,
1397 u16 *status, u16 *change)
1398{
1399 int ret;
1400
db90e7a1 1401 mutex_lock(&hub->status_mutex);
1da177e4 1402 ret = get_port_status(hub->hdev, port1, &hub->status->port);
d25450c6 1403 if (ret < 4) {
1da177e4
LT		 1404 dev_err (hub->intfdev,
1405 "%s failed (err = %d)\n", __FUNCTION__, ret);
d25450c6
AS		 1406 if (ret >= 0)
1407 ret = -EIO;
1408 } else {
1da177e4
LT		 1409 *status = le16_to_cpu(hub->status->port.wPortStatus);
1410 *change = le16_to_cpu(hub->status->port.wPortChange);
1411 ret = 0;
1412 }
db90e7a1 1413 mutex_unlock(&hub->status_mutex);
1da177e4
LT		 1414 return ret;
1415}
1416
0165de09
IPG		 1417
1418/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1419static unsigned hub_is_wusb(struct usb_hub *hub)
1420{
1421 struct usb_hcd *hcd;
1422 if (hub->hdev->parent != NULL) /* not a root hub? */
1423 return 0;
1424 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1425 return hcd->wireless;
1426}
1427
1428
1da177e4
LT		 1429#define PORT_RESET_TRIES 5
1430#define SET_ADDRESS_TRIES 2
1431#define GET_DESCRIPTOR_TRIES 2
1432#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1433#define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1434
1435#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1436#define HUB_SHORT_RESET_TIME 10
1437#define HUB_LONG_RESET_TIME 200
1438#define HUB_RESET_TIMEOUT 500
1439
1440static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1441 struct usb_device *udev, unsigned int delay)
1442{
1443 int delay_time, ret;
1444 u16 portstatus;
1445 u16 portchange;
1446
1447 for (delay_time = 0;
1448 delay_time < HUB_RESET_TIMEOUT;
1449 delay_time += delay) {
1450 /* wait to give the device a chance to reset */
1451 msleep(delay);
1452
1453 /* read and decode port status */
1454 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1455 if (ret < 0)
1456 return ret;
1457
1458 /* Device went away? */
1459 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1460 return -ENOTCONN;
1461
1462 /* bomb out completely if something weird happened */
1463 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1464 return -EINVAL;
1465
1466 /* if we`ve finished resetting, then break out of the loop */
1467 if (!(portstatus & USB_PORT_STAT_RESET) &&
1468 (portstatus & USB_PORT_STAT_ENABLE)) {
0165de09
IPG		 1469 if (hub_is_wusb(hub))
1470 udev->speed = USB_SPEED_VARIABLE;
1471 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1da177e4
LT		 1472 udev->speed = USB_SPEED_HIGH;
1473 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1474 udev->speed = USB_SPEED_LOW;
1475 else
1476 udev->speed = USB_SPEED_FULL;
1477 return 0;
1478 }
1479
1480 /* switch to the long delay after two short delay failures */
1481 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1482 delay = HUB_LONG_RESET_TIME;
1483
1484 dev_dbg (hub->intfdev,
1485 "port %d not reset yet, waiting %dms\n",
1486 port1, delay);
1487 }
1488
1489 return -EBUSY;
1490}
1491
1492static int hub_port_reset(struct usb_hub *hub, int port1,
1493 struct usb_device *udev, unsigned int delay)
1494{
1495 int i, status;
1496
1497 /* Reset the port */
1498 for (i = 0; i < PORT_RESET_TRIES; i++) {
1499 status = set_port_feature(hub->hdev,
1500 port1, USB_PORT_FEAT_RESET);
1501 if (status)
1502 dev_err(hub->intfdev,
1503 "cannot reset port %d (err = %d)\n",
1504 port1, status);
1505 else {
1506 status = hub_port_wait_reset(hub, port1, udev, delay);
dd16525b 1507 if (status && status != -ENOTCONN)
1da177e4
LT		 1508 dev_dbg(hub->intfdev,
1509 "port_wait_reset: err = %d\n",
1510 status);
1511 }
1512
1513 /* return on disconnect or reset */
1514 switch (status) {
1515 case 0:
b789696a
DB		 1516 /* TRSTRCY = 10 ms; plus some extra */
1517 msleep(10 + 40);
1da177e4
LT		 1518 /* FALL THROUGH */
1519 case -ENOTCONN:
1520 case -ENODEV:
1521 clear_port_feature(hub->hdev,
1522 port1, USB_PORT_FEAT_C_RESET);
1523 /* FIXME need disconnect() for NOTATTACHED device */
1524 usb_set_device_state(udev, status
1525 ? USB_STATE_NOTATTACHED
1526 : USB_STATE_DEFAULT);
1527 return status;
1528 }
1529
1530 dev_dbg (hub->intfdev,
1531 "port %d not enabled, trying reset again...\n",
1532 port1);
1533 delay = HUB_LONG_RESET_TIME;
1534 }
1535
1536 dev_err (hub->intfdev,
1537 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1538 port1);
1539
1540 return status;
1541}
1542
1da177e4
LT		 1543/*
1544 * Disable a port and mark a logical connnect-change event, so that some
1545 * time later khubd will disconnect() any existing usb_device on the port
1546 * and will re-enumerate if there actually is a device attached.
1547 */
1548static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1549{
1550 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1551 hub_port_disable(hub, port1, 1);
1552
1553 /* FIXME let caller ask to power down the port:
1554 * - some devices won't enumerate without a VBUS power cycle
1555 * - SRP saves power that way
390a8c34 1556 * - ... new call, TBD ...
1da177e4
LT		 1557 * That's easy if this hub can switch power per-port, and
1558 * khubd reactivates the port later (timer, SRP, etc).
1559 * Powerdown must be optional, because of reset/DFU.
1560 */
1561
1562 set_bit(port1, hub->change_bits);
1563 kick_khubd(hub);
1564}
1565
d388dab7 1566#ifdef CONFIG_PM
1da177e4
LT		 1567
1568#ifdef CONFIG_USB_SUSPEND
1569
1570/*
1571 * Selective port suspend reduces power; most suspended devices draw
1572 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1573 * All devices below the suspended port are also suspended.
1574 *
1575 * Devices leave suspend state when the host wakes them up. Some devices
1576 * also support "remote wakeup", where the device can activate the USB
1577 * tree above them to deliver data, such as a keypress or packet. In
1578 * some cases, this wakes the USB host.
1579 */
1580static int hub_port_suspend(struct usb_hub *hub, int port1,
1581 struct usb_device *udev)
1582{
1583 int status;
1584
1585 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1586
1587 /* enable remote wakeup when appropriate; this lets the device
1588 * wake up the upstream hub (including maybe the root hub).
1589 *
1590 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1591 * we don't explicitly enable it here.
1592 */
645daaab 1593 if (udev->do_remote_wakeup) {
1da177e4
LT		 1594 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1595 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1596 USB_DEVICE_REMOTE_WAKEUP, 0,
1597 NULL, 0,
1598 USB_CTRL_SET_TIMEOUT);
1599 if (status)
1600 dev_dbg(&udev->dev,
1601 "won't remote wakeup, status %d\n",
1602 status);
1603 }
1604
1605 /* see 7.1.7.6 */
1606 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1607 if (status) {
1608 dev_dbg(hub->intfdev,
1609 "can't suspend port %d, status %d\n",
1610 port1, status);
1611 /* paranoia: "should not happen" */
1612 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1613 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1614 USB_DEVICE_REMOTE_WAKEUP, 0,
1615 NULL, 0,
1616 USB_CTRL_SET_TIMEOUT);
1617 } else {
1618 /* device has up to 10 msec to fully suspend */
645daaab
AS		 1619 dev_dbg(&udev->dev, "usb %ssuspend\n",
1620 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1621 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1622 msleep(10);
1623 }
1624 return status;
1625}
1626
1627/*
1628 * Devices on USB hub ports have only one "suspend" state, corresponding
ba9d35fb 1629 * to ACPI D2, "may cause the device to lose some context".
1da177e4
LT		 1630 * State transitions include:
1631 *
1632 * - suspend, resume ... when the VBUS power link stays live
1633 * - suspend, disconnect ... VBUS lost
1634 *
1635 * Once VBUS drop breaks the circuit, the port it's using has to go through
1636 * normal re-enumeration procedures, starting with enabling VBUS power.
1637 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1638 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1639 * timer, no SRP, no requests through sysfs.
390a8c34
DB		 1640 *
1641 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1642 * the root hub for their bus goes into global suspend ... so we don't
1643 * (falsely) update the device power state to say it suspended.
1da177e4 1644 */
140d8f68 1645static int __usb_port_suspend (struct usb_device *udev, int port1)
1da177e4 1646{
f3f3253d 1647 int status = 0;
1da177e4
LT		 1648
1649 /* caller owns the udev device lock */
1650 if (port1 < 0)
1651 return port1;
1652
140d8f68
AS		 1653 /* we change the device's upstream USB link,
1654 * but root hubs have no upstream USB link.
1da177e4 1655 */
f3f3253d 1656 if (udev->parent)
1da177e4
LT		 1657 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1658 udev);
2bf4086d 1659 else {
645daaab
AS		 1660 dev_dbg(&udev->dev, "usb %ssuspend\n",
1661 udev->auto_pm ? "auto-" : "");
2bf4086d
AS		 1662 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1663 }
1da177e4
LT		 1664 return status;
1665}
1666
5edbfb7c 1667/*
140d8f68 1668 * usb_port_suspend - suspend a usb device's upstream port
1da177e4 1669 * @udev: device that's no longer in active use
5edbfb7c 1670 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1671 *
1672 * Suspends a USB device that isn't in active use, conserving power.
1673 * Devices may wake out of a suspend, if anything important happens,
1674 * using the remote wakeup mechanism. They may also be taken out of
140d8f68 1675 * suspend by the host, using usb_port_resume(). It's also routine
1da177e4
LT		 1676 * to disconnect devices while they are suspended.
1677 *
390a8c34
DB		 1678 * This only affects the USB hardware for a device; its interfaces
1679 * (and, for hubs, child devices) must already have been suspended.
1680 *
1da177e4
LT		 1681 * Suspending OTG devices may trigger HNP, if that's been enabled
1682 * between a pair of dual-role devices. That will change roles, such
1683 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1684 *
1685 * Returns 0 on success, else negative errno.
1686 */
140d8f68 1687int usb_port_suspend(struct usb_device *udev)
1da177e4 1688{
140d8f68 1689 return __usb_port_suspend(udev, udev->portnum);
1da177e4 1690}
f3f3253d 1691
1da177e4 1692/*
390a8c34
DB		 1693 * If the USB "suspend" state is in use (rather than "global suspend"),
1694 * many devices will be individually taken out of suspend state using
1695 * special" resume" signaling. These routines kick in shortly after
1da177e4
LT		 1696 * hardware resume signaling is finished, either because of selective
1697 * resume (by host) or remote wakeup (by device) ... now see what changed
1698 * in the tree that's rooted at this device.
1699 */
140d8f68 1700static int finish_port_resume(struct usb_device *udev)
1da177e4
LT		 1701{
1702 int status;
1703 u16 devstatus;
1704
1705 /* caller owns the udev device lock */
f3f3253d 1706 dev_dbg(&udev->dev, "finish resume\n");
1da177e4
LT		 1707
1708 /* usb ch9 identifies four variants of SUSPENDED, based on what
1709 * state the device resumes to. Linux currently won't see the
1710 * first two on the host side; they'd be inside hub_port_init()
1711 * during many timeouts, but khubd can't suspend until later.
1712 */
1713 usb_set_device_state(udev, udev->actconfig
1714 ? USB_STATE_CONFIGURED
1715 : USB_STATE_ADDRESS);
1da177e4
LT		 1716
1717 /* 10.5.4.5 says be sure devices in the tree are still there.
1718 * For now let's assume the device didn't go crazy on resume,
1719 * and device drivers will know about any resume quirks.
1720 */
1721 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
b40b7a90
AS		 1722 if (status >= 0)
1723 status = (status == 2 ? 0 : -ENODEV);
1724
1725 if (status)
1da177e4
LT		 1726 dev_dbg(&udev->dev,
1727 "gone after usb resume? status %d\n",
1728 status);
1729 else if (udev->actconfig) {
1da177e4 1730 le16_to_cpus(&devstatus);
55c52718 1731 if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
f3f3253d 1732 && udev->parent) {
1da177e4
LT		 1733 status = usb_control_msg(udev,
1734 usb_sndctrlpipe(udev, 0),
1735 USB_REQ_CLEAR_FEATURE,
1736 USB_RECIP_DEVICE,
1737 USB_DEVICE_REMOTE_WAKEUP, 0,
1738 NULL, 0,
1739 USB_CTRL_SET_TIMEOUT);
a8e7c565 1740 if (status)
1da177e4
LT		 1741 dev_dbg(&udev->dev, "disable remote "
1742 "wakeup, status %d\n", status);
4bf0ba86 1743 }
1da177e4
LT		 1744 status = 0;
1745
1746 } else if (udev->devnum <= 0) {
1747 dev_dbg(&udev->dev, "bogus resume!\n");
1748 status = -EINVAL;
1749 }
1750 return status;
1751}
1752
1753static int
1754hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1755{
1756 int status;
d25450c6
AS		 1757 u16 portchange, portstatus;
1758
1759 /* Skip the initial Clear-Suspend step for a remote wakeup */
1760 status = hub_port_status(hub, port1, &portstatus, &portchange);
1761 if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
1762 goto SuspendCleared;
1da177e4
LT		 1763
1764 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1765
d5cbad4b
AS		 1766 set_bit(port1, hub->busy_bits);
1767
1da177e4
LT		 1768 /* see 7.1.7.7; affects power usage, but not budgeting */
1769 status = clear_port_feature(hub->hdev,
1770 port1, USB_PORT_FEAT_SUSPEND);
1771 if (status) {
1772 dev_dbg(hub->intfdev,
1773 "can't resume port %d, status %d\n",
1774 port1, status);
1775 } else {
1da177e4
LT		 1776 /* drive resume for at least 20 msec */
1777 if (udev)
645daaab
AS		 1778 dev_dbg(&udev->dev, "usb %sresume\n",
1779 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1780 msleep(25);
1781
1782#define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1783 | USB_PORT_STAT_ENABLE \
1784 | USB_PORT_STAT_CONNECTION)
1785
1786 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1787 * stop resume signaling. Then finish the resume
1788 * sequence.
1789 */
d25450c6
AS		 1790 status = hub_port_status(hub, port1, &portstatus, &portchange);
1791SuspendCleared:
1da177e4 1792 if (status < 0
d25450c6
AS		 1793 || (portstatus & LIVE_FLAGS) != LIVE_FLAGS
1794 || (portstatus & USB_PORT_STAT_SUSPEND) != 0
1da177e4
LT		 1795 ) {
1796 dev_dbg(hub->intfdev,
1797 "port %d status %04x.%04x after resume, %d\n",
d25450c6 1798 port1, portchange, portstatus, status);
20307949
AS		 1799 if (status >= 0)
1800 status = -ENODEV;
1da177e4 1801 } else {
20307949
AS		 1802 if (portchange & USB_PORT_STAT_C_SUSPEND)
1803 clear_port_feature(hub->hdev, port1,
1804 USB_PORT_FEAT_C_SUSPEND);
1da177e4
LT		 1805 /* TRSMRCY = 10 msec */
1806 msleep(10);
1807 if (udev)
140d8f68 1808 status = finish_port_resume(udev);
1da177e4
LT		 1809 }
1810 }
1811 if (status < 0)
1812 hub_port_logical_disconnect(hub, port1);
1813
d5cbad4b
AS		 1814 clear_bit(port1, hub->busy_bits);
1815 if (!hub->hdev->parent && !hub->busy_bits[0])
1816 usb_enable_root_hub_irq(hub->hdev->bus);
1817
1da177e4
LT		 1818 return status;
1819}
1820
5edbfb7c 1821/*
140d8f68 1822 * usb_port_resume - re-activate a suspended usb device's upstream port
1da177e4 1823 * @udev: device to re-activate
5edbfb7c 1824 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1825 *
1826 * This will re-activate the suspended device, increasing power usage
1827 * while letting drivers communicate again with its endpoints.
1828 * USB resume explicitly guarantees that the power session between
1829 * the host and the device is the same as it was when the device
1830 * suspended.
1831 *
1832 * Returns 0 on success, else negative errno.
1833 */
140d8f68 1834int usb_port_resume(struct usb_device *udev)
1da177e4 1835{
d388dab7 1836 int status;
1da177e4 1837
140d8f68
AS		 1838 /* we change the device's upstream USB link,
1839 * but root hubs have no upstream USB link.
1840 */
f3f3253d 1841 if (udev->parent) {
114b368c
AS		 1842 // NOTE this fails if parent is also suspended...
1843 status = hub_port_resume(hdev_to_hub(udev->parent),
1844 udev->portnum, udev);
645daaab
AS		 1845 } else {
1846 dev_dbg(&udev->dev, "usb %sresume\n",
1847 udev->auto_pm ? "auto-" : "");
140d8f68 1848 status = finish_port_resume(udev);
645daaab 1849 }
f3f3253d 1850 if (status < 0)
a8e7c565 1851 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
1da177e4
LT		 1852 return status;
1853}
1854
1855static int remote_wakeup(struct usb_device *udev)
1856{
1857 int status = 0;
1858
9ad3d6cc 1859 usb_lock_device(udev);
1da177e4 1860 if (udev->state == USB_STATE_SUSPENDED) {
645daaab 1861 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
6b157c9b 1862 status = usb_external_resume_device(udev);
1da177e4 1863 }
9ad3d6cc 1864 usb_unlock_device(udev);
1da177e4
LT		 1865 return status;
1866}
1867
d388dab7
AS		 1868#else /* CONFIG_USB_SUSPEND */
1869
1870/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1871
1872int usb_port_suspend(struct usb_device *udev)
1873{
1874 return 0;
1875}
1876
1877static inline int
1878finish_port_resume(struct usb_device *udev)
1879{
1880 return 0;
1881}
1882
1883static inline int
1884hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1885{
1886 return 0;
1887}
1888
1889int usb_port_resume(struct usb_device *udev)
1890{
1891 return 0;
1892}
1893
1894static inline int remote_wakeup(struct usb_device *udev)
1895{
1896 return 0;
1897}
1898
1899#endif
1900
db690874 1901static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1da177e4
LT		 1902{
1903 struct usb_hub *hub = usb_get_intfdata (intf);
1904 struct usb_device *hdev = hub->hdev;
1905 unsigned port1;
12f1ff83 1906 int status = 0;
1da177e4 1907
c9f89fa4 1908 /* fail if children aren't already suspended */
1da177e4
LT		 1909 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1910 struct usb_device *udev;
1911
1912 udev = hdev->children [port1-1];
114b368c 1913 if (udev && msg.event == PM_EVENT_SUSPEND &&
f3f3253d 1914#ifdef CONFIG_USB_SUSPEND
114b368c
AS		 1915 udev->state != USB_STATE_SUSPENDED
1916#else
1917 udev->dev.power.power_state.event
1918 == PM_EVENT_ON
f3f3253d 1919#endif
114b368c 1920 ) {
645daaab
AS		 1921 if (!hdev->auto_pm)
1922 dev_dbg(&intf->dev, "port %d nyet suspended\n",
1923 port1);
c9f89fa4
DB		 1924 return -EBUSY;
1925 }
1da177e4
LT		 1926 }
1927
40f122f3
AS		 1928 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1929
12f1ff83
AS		 1930 /* stop khubd and related activity */
1931 hub_quiesce(hub);
1932
f3f3253d
DB		 1933 /* "global suspend" of the downstream HC-to-USB interface */
1934 if (!hdev->parent) {
12f1ff83
AS		 1935 status = hcd_bus_suspend(hdev->bus);
1936 if (status != 0) {
1937 dev_dbg(&hdev->dev, "'global' suspend %d\n", status);
1938 hub_activate(hub);
1939 }
f3f3253d 1940 }
12f1ff83 1941 return status;
1da177e4
LT		 1942}
1943
1944static int hub_resume(struct usb_interface *intf)
1945{
1da177e4 1946 struct usb_hub *hub = usb_get_intfdata (intf);
40f122f3 1947 struct usb_device *hdev = hub->hdev;
1da177e4
LT		 1948 int status;
1949
40f122f3
AS		 1950 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1951
f3f3253d
DB		 1952 /* "global resume" of the downstream HC-to-USB interface */
1953 if (!hdev->parent) {
1954 struct usb_bus *bus = hdev->bus;
0c0382e3
AS		 1955 if (bus) {
1956 status = hcd_bus_resume (bus);
f3f3253d
DB		 1957 if (status) {
1958 dev_dbg(&intf->dev, "'global' resume %d\n",
1959 status);
1960 return status;
1961 }
1962 } else
1963 return -EOPNOTSUPP;
1964 if (status == 0) {
1965 /* TRSMRCY = 10 msec */
1966 msleep(10);
1967 }
1968 }
1969
a8e7c565 1970 /* tell khubd to look for changes on this hub */
f3f3253d 1971 hub_activate(hub);
1da177e4
LT		 1972 return 0;
1973}
1974
d388dab7
AS		 1975#else /* CONFIG_PM */
1976
1977static inline int remote_wakeup(struct usb_device *udev)
1978{
1979 return 0;
1980}
1981
511366da
AM		 1982#define hub_suspend NULL
1983#define hub_resume NULL
d388dab7
AS		 1984#endif
1985
1da177e4
LT		 1986
1987/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
1988 *
1989 * Between connect detection and reset signaling there must be a delay
1990 * of 100ms at least for debounce and power-settling. The corresponding
1991 * timer shall restart whenever the downstream port detects a disconnect.
1992 *
1993 * Apparently there are some bluetooth and irda-dongles and a number of
1994 * low-speed devices for which this debounce period may last over a second.
1995 * Not covered by the spec - but easy to deal with.
1996 *
1997 * This implementation uses a 1500ms total debounce timeout; if the
1998 * connection isn't stable by then it returns -ETIMEDOUT. It checks
1999 * every 25ms for transient disconnects. When the port status has been
2000 * unchanged for 100ms it returns the port status.
2001 */
2002
2003#define HUB_DEBOUNCE_TIMEOUT 1500
2004#define HUB_DEBOUNCE_STEP 25
2005#define HUB_DEBOUNCE_STABLE 100
2006
2007static int hub_port_debounce(struct usb_hub *hub, int port1)
2008{
2009 int ret;
2010 int total_time, stable_time = 0;
2011 u16 portchange, portstatus;
2012 unsigned connection = 0xffff;
2013
2014 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2015 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2016 if (ret < 0)
2017 return ret;
2018
2019 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2020 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2021 stable_time += HUB_DEBOUNCE_STEP;
2022 if (stable_time >= HUB_DEBOUNCE_STABLE)
2023 break;
2024 } else {
2025 stable_time = 0;
2026 connection = portstatus & USB_PORT_STAT_CONNECTION;
2027 }
2028
2029 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2030 clear_port_feature(hub->hdev, port1,
2031 USB_PORT_FEAT_C_CONNECTION);
2032 }
2033
2034 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2035 break;
2036 msleep(HUB_DEBOUNCE_STEP);
2037 }
2038
2039 dev_dbg (hub->intfdev,
2040 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2041 port1, total_time, stable_time, portstatus);
2042
2043 if (stable_time < HUB_DEBOUNCE_STABLE)
2044 return -ETIMEDOUT;
2045 return portstatus;
2046}
2047
2048static void ep0_reinit(struct usb_device *udev)
2049{
2050 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2051 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2052 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2053}
2054
2055#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2056#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2057
2058static int hub_set_address(struct usb_device *udev)
2059{
2060 int retval;
2061
2062 if (udev->devnum == 0)
2063 return -EINVAL;
2064 if (udev->state == USB_STATE_ADDRESS)
2065 return 0;
2066 if (udev->state != USB_STATE_DEFAULT)
2067 return -EINVAL;
2068 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2069 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2070 NULL, 0, USB_CTRL_SET_TIMEOUT);
2071 if (retval == 0) {
2072 usb_set_device_state(udev, USB_STATE_ADDRESS);
2073 ep0_reinit(udev);
2074 }
2075 return retval;
2076}
2077
2078/* Reset device, (re)assign address, get device descriptor.
2079 * Device connection must be stable, no more debouncing needed.
2080 * Returns device in USB_STATE_ADDRESS, except on error.
2081 *
2082 * If this is called for an already-existing device (as part of
2083 * usb_reset_device), the caller must own the device lock. For a
2084 * newly detected device that is not accessible through any global
2085 * pointers, it's not necessary to lock the device.
2086 */
2087static int
2088hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2089 int retry_counter)
2090{
4186ecf8 2091 static DEFINE_MUTEX(usb_address0_mutex);
1da177e4
LT		 2092
2093 struct usb_device *hdev = hub->hdev;
2094 int i, j, retval;
2095 unsigned delay = HUB_SHORT_RESET_TIME;
2096 enum usb_device_speed oldspeed = udev->speed;
83a07196 2097 char *speed, *type;
1da177e4
LT		 2098
2099 /* root hub ports have a slightly longer reset period
2100 * (from USB 2.0 spec, section 7.1.7.5)
2101 */
2102 if (!hdev->parent) {
2103 delay = HUB_ROOT_RESET_TIME;
2104 if (port1 == hdev->bus->otg_port)
2105 hdev->bus->b_hnp_enable = 0;
2106 }
2107
2108 /* Some low speed devices have problems with the quick delay, so */
2109 /* be a bit pessimistic with those devices. RHbug #23670 */
2110 if (oldspeed == USB_SPEED_LOW)
2111 delay = HUB_LONG_RESET_TIME;
2112
4186ecf8 2113 mutex_lock(&usb_address0_mutex);
1da177e4
LT		 2114
2115 /* Reset the device; full speed may morph to high speed */
2116 retval = hub_port_reset(hub, port1, udev, delay);
2117 if (retval < 0) /* error or disconnect */
2118 goto fail;
2119 /* success, speed is known */
2120 retval = -ENODEV;
2121
2122 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2123 dev_dbg(&udev->dev, "device reset changed speed!\n");
2124 goto fail;
2125 }
2126 oldspeed = udev->speed;
2127
2128 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2129 * it's fixed size except for full speed devices.
5bb6e0ae
IPG		 2130 * For Wireless USB devices, ep0 max packet is always 512 (tho
2131 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
1da177e4
LT		 2132 */
2133 switch (udev->speed) {
5bb6e0ae
IPG		 2134 case USB_SPEED_VARIABLE: /* fixed at 512 */
2135 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
2136 break;
1da177e4
LT		 2137 case USB_SPEED_HIGH: /* fixed at 64 */
2138 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2139 break;
2140 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2141 /* to determine the ep0 maxpacket size, try to read
2142 * the device descriptor to get bMaxPacketSize0 and
2143 * then correct our initial guess.
2144 */
2145 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2146 break;
2147 case USB_SPEED_LOW: /* fixed at 8 */
2148 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2149 break;
2150 default:
2151 goto fail;
2152 }
2153
83a07196
IPG		 2154 type = "";
2155 switch (udev->speed) {
2156 case USB_SPEED_LOW: speed = "low"; break;
2157 case USB_SPEED_FULL: speed = "full"; break;
2158 case USB_SPEED_HIGH: speed = "high"; break;
2159 case USB_SPEED_VARIABLE:
2160 speed = "variable";
2161 type = "Wireless ";
2162 break;
2163 default: speed = "?"; break;
2164 }
1da177e4 2165 dev_info (&udev->dev,
83a07196
IPG		 2166 "%s %s speed %sUSB device using %s and address %d\n",
2167 (udev->config) ? "reset" : "new", speed, type,
2168 udev->bus->controller->driver->name, udev->devnum);
1da177e4
LT		 2169
2170 /* Set up TT records, if needed */
2171 if (hdev->tt) {
2172 udev->tt = hdev->tt;
2173 udev->ttport = hdev->ttport;
2174 } else if (udev->speed != USB_SPEED_HIGH
2175 && hdev->speed == USB_SPEED_HIGH) {
2176 udev->tt = &hub->tt;
2177 udev->ttport = port1;
2178 }
2179
2180 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2181 * Because device hardware and firmware is sometimes buggy in
2182 * this area, and this is how Linux has done it for ages.
2183 * Change it cautiously.
2184 *
2185 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2186 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2187 * so it may help with some non-standards-compliant devices.
2188 * Otherwise we start with SET_ADDRESS and then try to read the
2189 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2190 * value.
2191 */
2192 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2193 if (USE_NEW_SCHEME(retry_counter)) {
2194 struct usb_device_descriptor *buf;
2195 int r = 0;
2196
2197#define GET_DESCRIPTOR_BUFSIZE 64
2198 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2199 if (!buf) {
2200 retval = -ENOMEM;
2201 continue;
2202 }
2203
2204 /* Use a short timeout the first time through,
2205 * so that recalcitrant full-speed devices with
2206 * 8- or 16-byte ep0-maxpackets won't slow things
2207 * down tremendously by NAKing the unexpectedly
2208 * early status stage. Also, retry on all errors;
2209 * some devices are flakey.
5bb6e0ae
IPG		 2210 * 255 is for WUSB devices, we actually need to use 512.
2211 * WUSB1.0[4.8.1].
1da177e4
LT		 2212 */
2213 for (j = 0; j < 3; ++j) {
2214 buf->bMaxPacketSize0 = 0;
2215 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2216 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2217 USB_DT_DEVICE << 8, 0,
2218 buf, GET_DESCRIPTOR_BUFSIZE,
2219 (i ? USB_CTRL_GET_TIMEOUT : 1000));
2220 switch (buf->bMaxPacketSize0) {
5bb6e0ae 2221 case 8: case 16: case 32: case 64: case 255:
1da177e4
LT		 2222 if (buf->bDescriptorType ==
2223 USB_DT_DEVICE) {
2224 r = 0;
2225 break;
2226 }
2227 /* FALL THROUGH */
2228 default:
2229 if (r == 0)
2230 r = -EPROTO;
2231 break;
2232 }
2233 if (r == 0)
2234 break;
2235 }
2236 udev->descriptor.bMaxPacketSize0 =
2237 buf->bMaxPacketSize0;
2238 kfree(buf);
2239
2240 retval = hub_port_reset(hub, port1, udev, delay);
2241 if (retval < 0) /* error or disconnect */
2242 goto fail;
2243 if (oldspeed != udev->speed) {
2244 dev_dbg(&udev->dev,
2245 "device reset changed speed!\n");
2246 retval = -ENODEV;
2247 goto fail;
2248 }
2249 if (r) {
2250 dev_err(&udev->dev, "device descriptor "
2251 "read/%s, error %d\n",
2252 "64", r);
2253 retval = -EMSGSIZE;
2254 continue;
2255 }
2256#undef GET_DESCRIPTOR_BUFSIZE
2257 }
2258
2259 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2260 retval = hub_set_address(udev);
2261 if (retval >= 0)
2262 break;
2263 msleep(200);
2264 }
2265 if (retval < 0) {
2266 dev_err(&udev->dev,
2267 "device not accepting address %d, error %d\n",
2268 udev->devnum, retval);
2269 goto fail;
2270 }
2271
2272 /* cope with hardware quirkiness:
2273 * - let SET_ADDRESS settle, some device hardware wants it
2274 * - read ep0 maxpacket even for high and low speed,
2275 */
2276 msleep(10);
2277 if (USE_NEW_SCHEME(retry_counter))
2278 break;
2279
2280 retval = usb_get_device_descriptor(udev, 8);
2281 if (retval < 8) {
2282 dev_err(&udev->dev, "device descriptor "
2283 "read/%s, error %d\n",
2284 "8", retval);
2285 if (retval >= 0)
2286 retval = -EMSGSIZE;
2287 } else {
2288 retval = 0;
2289 break;
2290 }
2291 }
2292 if (retval)
2293 goto fail;
2294
5bb6e0ae
IPG		 2295 i = udev->descriptor.bMaxPacketSize0 == 0xff?
2296 512 : udev->descriptor.bMaxPacketSize0;
1da177e4
LT		 2297 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2298 if (udev->speed != USB_SPEED_FULL ||
2299 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2300 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2301 retval = -EMSGSIZE;
2302 goto fail;
2303 }
2304 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2305 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2306 ep0_reinit(udev);
2307 }
2308
2309 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2310 if (retval < (signed)sizeof(udev->descriptor)) {
2311 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2312 "all", retval);
2313 if (retval >= 0)
2314 retval = -ENOMSG;
2315 goto fail;
2316 }
2317
2318 retval = 0;
2319
2320fail:
2321 if (retval)
2322 hub_port_disable(hub, port1, 0);
4186ecf8 2323 mutex_unlock(&usb_address0_mutex);
1da177e4
LT		 2324 return retval;
2325}
2326
2327static void
2328check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2329{
2330 struct usb_qualifier_descriptor *qual;
2331 int status;
2332
e94b1766 2333 qual = kmalloc (sizeof *qual, GFP_KERNEL);
1da177e4
LT		 2334 if (qual == NULL)
2335 return;
2336
2337 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2338 qual, sizeof *qual);
2339 if (status == sizeof *qual) {
2340 dev_info(&udev->dev, "not running at top speed; "
2341 "connect to a high speed hub\n");
2342 /* hub LEDs are probably harder to miss than syslog */
2343 if (hub->has_indicators) {
2344 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
c4028958 2345 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2346 }
2347 }
1bc3c9e1 2348 kfree(qual);
1da177e4
LT		 2349}
2350
2351static unsigned
2352hub_power_remaining (struct usb_hub *hub)
2353{
2354 struct usb_device *hdev = hub->hdev;
2355 int remaining;
55c52718 2356 int port1;
1da177e4 2357
55c52718 2358 if (!hub->limited_power)
1da177e4
LT		 2359 return 0;
2360
55c52718
AS		 2361 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2362 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2363 struct usb_device *udev = hdev->children[port1 - 1];
2364 int delta;
1da177e4
LT		 2365
2366 if (!udev)
2367 continue;
2368
55c52718
AS		 2369 /* Unconfigured devices may not use more than 100mA,
2370 * or 8mA for OTG ports */
1da177e4 2371 if (udev->actconfig)
55c52718
AS		 2372 delta = udev->actconfig->desc.bMaxPower * 2;
2373 else if (port1 != udev->bus->otg_port || hdev->parent)
2374 delta = 100;
1da177e4 2375 else
55c52718
AS		 2376 delta = 8;
2377 if (delta > hub->mA_per_port)
2378 dev_warn(&udev->dev, "%dmA is over %umA budget "
2379 "for port %d!\n",
2380 delta, hub->mA_per_port, port1);
1da177e4
LT		 2381 remaining -= delta;
2382 }
2383 if (remaining < 0) {
55c52718
AS		 2384 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2385 - remaining);
1da177e4
LT		 2386 remaining = 0;
2387 }
2388 return remaining;
2389}
2390
2391/* Handle physical or logical connection change events.
2392 * This routine is called when:
2393 * a port connection-change occurs;
2394 * a port enable-change occurs (often caused by EMI);
2395 * usb_reset_device() encounters changed descriptors (as from
2396 * a firmware download)
2397 * caller already locked the hub
2398 */
2399static void hub_port_connect_change(struct usb_hub *hub, int port1,
2400 u16 portstatus, u16 portchange)
2401{
2402 struct usb_device *hdev = hub->hdev;
2403 struct device *hub_dev = hub->intfdev;
74ad9bd2 2404 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4
LT		 2405 int status, i;
2406
2407 dev_dbg (hub_dev,
2408 "port %d, status %04x, change %04x, %s\n",
2409 port1, portstatus, portchange, portspeed (portstatus));
2410
2411 if (hub->has_indicators) {
2412 set_port_led(hub, port1, HUB_LED_AUTO);
2413 hub->indicator[port1-1] = INDICATOR_AUTO;
2414 }
2415
2416 /* Disconnect any existing devices under this port */
2417 if (hdev->children[port1-1])
2418 usb_disconnect(&hdev->children[port1-1]);
2419 clear_bit(port1, hub->change_bits);
2420
2421#ifdef CONFIG_USB_OTG
2422 /* during HNP, don't repeat the debounce */
2423 if (hdev->bus->is_b_host)
2424 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2425#endif
2426
2427 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2428 status = hub_port_debounce(hub, port1);
7bc4b81d 2429 if (status < 0 && printk_ratelimit()) {
1da177e4
LT		 2430 dev_err (hub_dev,
2431 "connect-debounce failed, port %d disabled\n",
2432 port1);
2433 goto done;
2434 }
2435 portstatus = status;
2436 }
2437
2438 /* Return now if nothing is connected */
2439 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2440
2441 /* maybe switch power back on (e.g. root hub was reset) */
74ad9bd2 2442 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
1da177e4
LT		 2443 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2444 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2445
2446 if (portstatus & USB_PORT_STAT_ENABLE)
2447 goto done;
2448 return;
2449 }
2450
2451#ifdef CONFIG_USB_SUSPEND
2452 /* If something is connected, but the port is suspended, wake it up. */
2453 if (portstatus & USB_PORT_STAT_SUSPEND) {
2454 status = hub_port_resume(hub, port1, NULL);
2455 if (status < 0) {
2456 dev_dbg(hub_dev,
2457 "can't clear suspend on port %d; %d\n",
2458 port1, status);
2459 goto done;
2460 }
2461 }
2462#endif
2463
2464 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2465 struct usb_device *udev;
2466
2467 /* reallocate for each attempt, since references
2468 * to the previous one can escape in various ways
2469 */
2470 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2471 if (!udev) {
2472 dev_err (hub_dev,
2473 "couldn't allocate port %d usb_device\n",
2474 port1);
2475 goto done;
2476 }
2477
2478 usb_set_device_state(udev, USB_STATE_POWERED);
2479 udev->speed = USB_SPEED_UNKNOWN;
55c52718 2480 udev->bus_mA = hub->mA_per_port;
b6956ffa 2481 udev->level = hdev->level + 1;
55c52718 2482
1da177e4
LT		 2483 /* set the address */
2484 choose_address(udev);
2485 if (udev->devnum <= 0) {
2486 status = -ENOTCONN; /* Don't retry */
2487 goto loop;
2488 }
2489
2490 /* reset and get descriptor */
2491 status = hub_port_init(hub, udev, port1, i);
2492 if (status < 0)
2493 goto loop;
2494
2495 /* consecutive bus-powered hubs aren't reliable; they can
2496 * violate the voltage drop budget. if the new child has
2497 * a "powered" LED, users should notice we didn't enable it
2498 * (without reading syslog), even without per-port LEDs
2499 * on the parent.
2500 */
2501 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
55c52718 2502 && udev->bus_mA <= 100) {
1da177e4
LT		 2503 u16 devstat;
2504
2505 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2506 &devstat);
55c52718 2507 if (status < 2) {
1da177e4
LT		 2508 dev_dbg(&udev->dev, "get status %d ?\n", status);
2509 goto loop_disable;
2510 }
55c52718 2511 le16_to_cpus(&devstat);
1da177e4
LT		 2512 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2513 dev_err(&udev->dev,
2514 "can't connect bus-powered hub "
2515 "to this port\n");
2516 if (hub->has_indicators) {
2517 hub->indicator[port1-1] =
2518 INDICATOR_AMBER_BLINK;
c4028958 2519 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2520 }
2521 status = -ENOTCONN; /* Don't retry */
2522 goto loop_disable;
2523 }
2524 }
2525
2526 /* check for devices running slower than they could */
2527 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2528 && udev->speed == USB_SPEED_FULL
2529 && highspeed_hubs != 0)
2530 check_highspeed (hub, udev, port1);
2531
2532 /* Store the parent's children[] pointer. At this point
2533 * udev becomes globally accessible, although presumably
2534 * no one will look at it until hdev is unlocked.
2535 */
1da177e4
LT		 2536 status = 0;
2537
2538 /* We mustn't add new devices if the parent hub has
2539 * been disconnected; we would race with the
2540 * recursively_mark_NOTATTACHED() routine.
2541 */
2542 spin_lock_irq(&device_state_lock);
2543 if (hdev->state == USB_STATE_NOTATTACHED)
2544 status = -ENOTCONN;
2545 else
2546 hdev->children[port1-1] = udev;
2547 spin_unlock_irq(&device_state_lock);
2548
2549 /* Run it through the hoops (find a driver, etc) */
2550 if (!status) {
2551 status = usb_new_device(udev);
2552 if (status) {
2553 spin_lock_irq(&device_state_lock);
2554 hdev->children[port1-1] = NULL;
2555 spin_unlock_irq(&device_state_lock);
2556 }
2557 }
2558
1da177e4
LT		 2559 if (status)
2560 goto loop_disable;
2561
2562 status = hub_power_remaining(hub);
2563 if (status)
55c52718 2564 dev_dbg(hub_dev, "%dmA power budget left\n", status);
1da177e4
LT		 2565
2566 return;
2567
2568loop_disable:
2569 hub_port_disable(hub, port1, 1);
2570loop:
2571 ep0_reinit(udev);
2572 release_address(udev);
2573 usb_put_dev(udev);
2574 if (status == -ENOTCONN)
2575 break;
2576 }
2577
2578done:
2579 hub_port_disable(hub, port1, 1);
2580}
2581
2582static void hub_events(void)
2583{
2584 struct list_head *tmp;
2585 struct usb_device *hdev;
2586 struct usb_interface *intf;
2587 struct usb_hub *hub;
2588 struct device *hub_dev;
2589 u16 hubstatus;
2590 u16 hubchange;
2591 u16 portstatus;
2592 u16 portchange;
2593 int i, ret;
2594 int connect_change;
2595
2596 /*
2597 * We restart the list every time to avoid a deadlock with
2598 * deleting hubs downstream from this one. This should be
2599 * safe since we delete the hub from the event list.
2600 * Not the most efficient, but avoids deadlocks.
2601 */
2602 while (1) {
2603
2604 /* Grab the first entry at the beginning of the list */
2605 spin_lock_irq(&hub_event_lock);
2606 if (list_empty(&hub_event_list)) {
2607 spin_unlock_irq(&hub_event_lock);
2608 break;
2609 }
2610
2611 tmp = hub_event_list.next;
2612 list_del_init(tmp);
2613
2614 hub = list_entry(tmp, struct usb_hub, event_list);
2615 hdev = hub->hdev;
2616 intf = to_usb_interface(hub->intfdev);
2617 hub_dev = &intf->dev;
2618
40f122f3 2619 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
1da177e4
LT		 2620 hdev->state, hub->descriptor
2621 ? hub->descriptor->bNbrPorts
2622 : 0,
2623 /* NOTE: expects max 15 ports... */
2624 (u16) hub->change_bits[0],
40f122f3 2625 (u16) hub->event_bits[0]);
1da177e4
LT		 2626
2627 usb_get_intf(intf);
1da177e4
LT		 2628 spin_unlock_irq(&hub_event_lock);
2629
1da177e4
LT		 2630 /* Lock the device, then check to see if we were
2631 * disconnected while waiting for the lock to succeed. */
2632 if (locktree(hdev) < 0) {
2633 usb_put_intf(intf);
2634 continue;
2635 }
2636 if (hub != usb_get_intfdata(intf))
2637 goto loop;
2638
2639 /* If the hub has died, clean up after it */
2640 if (hdev->state == USB_STATE_NOTATTACHED) {
7de18d8b
AS		 2641 hub->error = -ENODEV;
2642 hub_pre_reset(intf);
1da177e4
LT		 2643 goto loop;
2644 }
2645
40f122f3
AS		 2646 /* Autoresume */
2647 ret = usb_autopm_get_interface(intf);
2648 if (ret) {
2649 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
2650 goto loop;
2651 }
a8e7c565 2652
40f122f3 2653 /* If this is an inactive hub, do nothing */
1da177e4 2654 if (hub->quiescing)
40f122f3 2655 goto loop_autopm;
1da177e4
LT		 2656
2657 if (hub->error) {
2658 dev_dbg (hub_dev, "resetting for error %d\n",
2659 hub->error);
2660
7de18d8b 2661 ret = usb_reset_composite_device(hdev, intf);
1da177e4
LT		 2662 if (ret) {
2663 dev_dbg (hub_dev,
2664 "error resetting hub: %d\n", ret);
40f122f3 2665 goto loop_autopm;
1da177e4
LT		 2666 }
2667
2668 hub->nerrors = 0;
2669 hub->error = 0;
2670 }
2671
2672 /* deal with port status changes */
2673 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2674 if (test_bit(i, hub->busy_bits))
2675 continue;
2676 connect_change = test_bit(i, hub->change_bits);
2677 if (!test_and_clear_bit(i, hub->event_bits) &&
2678 !connect_change && !hub->activating)
2679 continue;
2680
2681 ret = hub_port_status(hub, i,
2682 &portstatus, &portchange);
2683 if (ret < 0)
2684 continue;
2685
2686 if (hub->activating && !hdev->children[i-1] &&
2687 (portstatus &
2688 USB_PORT_STAT_CONNECTION))
2689 connect_change = 1;
2690
2691 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2692 clear_port_feature(hdev, i,
2693 USB_PORT_FEAT_C_CONNECTION);
2694 connect_change = 1;
2695 }
2696
2697 if (portchange & USB_PORT_STAT_C_ENABLE) {
2698 if (!connect_change)
2699 dev_dbg (hub_dev,
2700 "port %d enable change, "
2701 "status %08x\n",
2702 i, portstatus);
2703 clear_port_feature(hdev, i,
2704 USB_PORT_FEAT_C_ENABLE);
2705
2706 /*
2707 * EM interference sometimes causes badly
2708 * shielded USB devices to be shutdown by
2709 * the hub, this hack enables them again.
2710 * Works at least with mouse driver.
2711 */
2712 if (!(portstatus & USB_PORT_STAT_ENABLE)
2713 && !connect_change
2714 && hdev->children[i-1]) {
2715 dev_err (hub_dev,
2716 "port %i "
2717 "disabled by hub (EMI?), "
2718 "re-enabling...\n",
2719 i);
2720 connect_change = 1;
2721 }
2722 }
2723
2724 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2725 clear_port_feature(hdev, i,
2726 USB_PORT_FEAT_C_SUSPEND);
2727 if (hdev->children[i-1]) {
2728 ret = remote_wakeup(hdev->
2729 children[i-1]);
2730 if (ret < 0)
2731 connect_change = 1;
2732 } else {
2733 ret = -ENODEV;
2734 hub_port_disable(hub, i, 1);
2735 }
2736 dev_dbg (hub_dev,
2737 "resume on port %d, status %d\n",
2738 i, ret);
2739 }
2740
2741 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2742 dev_err (hub_dev,
2743 "over-current change on port %d\n",
2744 i);
2745 clear_port_feature(hdev, i,
2746 USB_PORT_FEAT_C_OVER_CURRENT);
2747 hub_power_on(hub);
2748 }
2749
2750 if (portchange & USB_PORT_STAT_C_RESET) {
2751 dev_dbg (hub_dev,
2752 "reset change on port %d\n",
2753 i);
2754 clear_port_feature(hdev, i,
2755 USB_PORT_FEAT_C_RESET);
2756 }
2757
2758 if (connect_change)
2759 hub_port_connect_change(hub, i,
2760 portstatus, portchange);
2761 } /* end for i */
2762
2763 /* deal with hub status changes */
2764 if (test_and_clear_bit(0, hub->event_bits) == 0)
2765 ; /* do nothing */
2766 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2767 dev_err (hub_dev, "get_hub_status failed\n");
2768 else {
2769 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2770 dev_dbg (hub_dev, "power change\n");
2771 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
55c52718
AS		 2772 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2773 /* FIXME: Is this always true? */
2774 hub->limited_power = 0;
2775 else
2776 hub->limited_power = 1;
1da177e4
LT		 2777 }
2778 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2779 dev_dbg (hub_dev, "overcurrent change\n");
2780 msleep(500); /* Cool down */
2781 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2782 hub_power_on(hub);
2783 }
2784 }
2785
2786 hub->activating = 0;
2787
d5926ae7
AS		 2788 /* If this is a root hub, tell the HCD it's okay to
2789 * re-enable port-change interrupts now. */
d5cbad4b 2790 if (!hdev->parent && !hub->busy_bits[0])
d5926ae7
AS		 2791 usb_enable_root_hub_irq(hdev->bus);
2792
40f122f3
AS		 2793loop_autopm:
2794 /* Allow autosuspend if we're not going to run again */
2795 if (list_empty(&hub->event_list))
2796 usb_autopm_enable(intf);
1da177e4
LT		 2797loop:
2798 usb_unlock_device(hdev);
2799 usb_put_intf(intf);
2800
2801 } /* end while (1) */
2802}
2803
2804static int hub_thread(void *__unused)
2805{
1da177e4
LT		 2806 do {
2807 hub_events();
9c8d6178 2808 wait_event_interruptible(khubd_wait,
2809 !list_empty(&hub_event_list) ||
2810 kthread_should_stop());
3e1d1d28 2811 try_to_freeze();
9c8d6178 2812 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
1da177e4 2813
9c8d6178 2814 pr_debug("%s: khubd exiting\n", usbcore_name);
2815 return 0;
1da177e4
LT		 2816}
2817
2818static struct usb_device_id hub_id_table [] = {
2819 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2820 .bDeviceClass = USB_CLASS_HUB},
2821 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2822 .bInterfaceClass = USB_CLASS_HUB},
2823 { } /* Terminating entry */
2824};
2825
2826MODULE_DEVICE_TABLE (usb, hub_id_table);
2827
2828static struct usb_driver hub_driver = {
1da177e4
LT		 2829 .name = "hub",
2830 .probe = hub_probe,
2831 .disconnect = hub_disconnect,
2832 .suspend = hub_suspend,
2833 .resume = hub_resume,
7de18d8b
AS		 2834 .pre_reset = hub_pre_reset,
2835 .post_reset = hub_post_reset,
1da177e4
LT		 2836 .ioctl = hub_ioctl,
2837 .id_table = hub_id_table,
40f122f3 2838 .supports_autosuspend = 1,
1da177e4
LT		 2839};
2840
2841int usb_hub_init(void)
2842{
1da177e4
LT		 2843 if (usb_register(&hub_driver) < 0) {
2844 printk(KERN_ERR "%s: can't register hub driver\n",
2845 usbcore_name);
2846 return -1;
2847 }
2848
9c8d6178 2849 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2850 if (!IS_ERR(khubd_task))
1da177e4 2851 return 0;
1da177e4
LT		 2852
2853 /* Fall through if kernel_thread failed */
2854 usb_deregister(&hub_driver);
2855 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2856
2857 return -1;
2858}
2859
2860void usb_hub_cleanup(void)
2861{
9c8d6178 2862 kthread_stop(khubd_task);
1da177e4
LT		 2863
2864 /*
2865 * Hub resources are freed for us by usb_deregister. It calls
2866 * usb_driver_purge on every device which in turn calls that
2867 * devices disconnect function if it is using this driver.
2868 * The hub_disconnect function takes care of releasing the
2869 * individual hub resources. -greg
2870 */
2871 usb_deregister(&hub_driver);
2872} /* usb_hub_cleanup() */
2873
1da177e4
LT		 2874static int config_descriptors_changed(struct usb_device *udev)
2875{
2876 unsigned index;
2877 unsigned len = 0;
2878 struct usb_config_descriptor *buf;
2879
2880 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2881 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2882 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2883 }
e94b1766 2884 buf = kmalloc (len, GFP_KERNEL);
1da177e4
LT		 2885 if (buf == NULL) {
2886 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2887 /* assume the worst */
2888 return 1;
2889 }
2890 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2891 int length;
2892 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2893
2894 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2895 old_length);
2896 if (length < old_length) {
2897 dev_dbg(&udev->dev, "config index %d, error %d\n",
2898 index, length);
2899 break;
2900 }
2901 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2902 != 0) {
2903 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2904 index, buf->bConfigurationValue);
2905 break;
2906 }
2907 }
2908 kfree(buf);
2909 return index != udev->descriptor.bNumConfigurations;
2910}
2911
2912/**
2913 * usb_reset_device - perform a USB port reset to reinitialize a device
2914 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2915 *
79efa097
AS		 2916 * WARNING - don't use this routine to reset a composite device
2917 * (one with multiple interfaces owned by separate drivers)!
2918 * Use usb_reset_composite_device() instead.
1da177e4
LT		 2919 *
2920 * Do a port reset, reassign the device's address, and establish its
2921 * former operating configuration. If the reset fails, or the device's
2922 * descriptors change from their values before the reset, or the original
2923 * configuration and altsettings cannot be restored, a flag will be set
2924 * telling khubd to pretend the device has been disconnected and then
2925 * re-connected. All drivers will be unbound, and the device will be
2926 * re-enumerated and probed all over again.
2927 *
2928 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2929 * flagged for logical disconnection, or some other negative error code
2930 * if the reset wasn't even attempted.
2931 *
2932 * The caller must own the device lock. For example, it's safe to use
2933 * this from a driver probe() routine after downloading new firmware.
2934 * For calls that might not occur during probe(), drivers should lock
2935 * the device using usb_lock_device_for_reset().
2936 */
2937int usb_reset_device(struct usb_device *udev)
2938{
2939 struct usb_device *parent_hdev = udev->parent;
2940 struct usb_hub *parent_hub;
2941 struct usb_device_descriptor descriptor = udev->descriptor;
12c3da34
AS		 2942 int i, ret = 0;
2943 int port1 = udev->portnum;
1da177e4
LT		 2944
2945 if (udev->state == USB_STATE_NOTATTACHED ||
2946 udev->state == USB_STATE_SUSPENDED) {
2947 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2948 udev->state);
2949 return -EINVAL;
2950 }
2951
2952 if (!parent_hdev) {
2953 /* this requires hcd-specific logic; see OHCI hc_restart() */
2954 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2955 return -EISDIR;
2956 }
1da177e4
LT		 2957 parent_hub = hdev_to_hub(parent_hdev);
2958
1da177e4
LT		 2959 set_bit(port1, parent_hub->busy_bits);
2960 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2961
2962 /* ep0 maxpacket size may change; let the HCD know about it.
2963 * Other endpoints will be handled by re-enumeration. */
2964 ep0_reinit(udev);
2965 ret = hub_port_init(parent_hub, udev, port1, i);
2966 if (ret >= 0)
2967 break;
2968 }
2969 clear_bit(port1, parent_hub->busy_bits);
d5cbad4b
AS		 2970 if (!parent_hdev->parent && !parent_hub->busy_bits[0])
2971 usb_enable_root_hub_irq(parent_hdev->bus);
2972
1da177e4
LT		 2973 if (ret < 0)
2974 goto re_enumerate;
2975
2976 /* Device might have changed firmware (DFU or similar) */
2977 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
2978 || config_descriptors_changed (udev)) {
2979 dev_info(&udev->dev, "device firmware changed\n");
2980 udev->descriptor = descriptor; /* for disconnect() calls */
2981 goto re_enumerate;
2982 }
2983
2984 if (!udev->actconfig)
2985 goto done;
2986
2987 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2988 USB_REQ_SET_CONFIGURATION, 0,
2989 udev->actconfig->desc.bConfigurationValue, 0,
2990 NULL, 0, USB_CTRL_SET_TIMEOUT);
2991 if (ret < 0) {
2992 dev_err(&udev->dev,
2993 "can't restore configuration #%d (error=%d)\n",
2994 udev->actconfig->desc.bConfigurationValue, ret);
2995 goto re_enumerate;
2996 }
2997 usb_set_device_state(udev, USB_STATE_CONFIGURED);
2998
2999 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3000 struct usb_interface *intf = udev->actconfig->interface[i];
3001 struct usb_interface_descriptor *desc;
3002
3003 /* set_interface resets host side toggle even
3004 * for altsetting zero. the interface may have no driver.
3005 */
3006 desc = &intf->cur_altsetting->desc;
3007 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3008 desc->bAlternateSetting);
3009 if (ret < 0) {
3010 dev_err(&udev->dev, "failed to restore interface %d "
3011 "altsetting %d (error=%d)\n",
3012 desc->bInterfaceNumber,
3013 desc->bAlternateSetting,
3014 ret);
3015 goto re_enumerate;
3016 }
3017 }
3018
3019done:
1da177e4
LT		 3020 return 0;
3021
3022re_enumerate:
3023 hub_port_logical_disconnect(parent_hub, port1);
3024 return -ENODEV;
3025}
140d8f68 3026EXPORT_SYMBOL(usb_reset_device);
79efa097
AS		 3027
3028/**
3029 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3030 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3031 * @iface: interface bound to the driver making the request (optional)
3032 *
3033 * Warns all drivers bound to registered interfaces (using their pre_reset
3034 * method), performs the port reset, and then lets the drivers know that
3035 * the reset is over (using their post_reset method).
3036 *
3037 * Return value is the same as for usb_reset_device().
3038 *
3039 * The caller must own the device lock. For example, it's safe to use
3040 * this from a driver probe() routine after downloading new firmware.
3041 * For calls that might not occur during probe(), drivers should lock
3042 * the device using usb_lock_device_for_reset().
3043 *
3044 * The interface locks are acquired during the pre_reset stage and released
3045 * during the post_reset stage. However if iface is not NULL and is
3046 * currently being probed, we assume that the caller already owns its
3047 * lock.
3048 */
3049int usb_reset_composite_device(struct usb_device *udev,
3050 struct usb_interface *iface)
3051{
3052 int ret;
3053 struct usb_host_config *config = udev->actconfig;
3054
3055 if (udev->state == USB_STATE_NOTATTACHED ||
3056 udev->state == USB_STATE_SUSPENDED) {
3057 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3058 udev->state);
3059 return -EINVAL;
3060 }
3061
645daaab 3062 /* Prevent autosuspend during the reset */
94fcda1f 3063 usb_autoresume_device(udev);
645daaab 3064
79efa097
AS		 3065 if (iface && iface->condition != USB_INTERFACE_BINDING)
3066 iface = NULL;
3067
3068 if (config) {
3069 int i;
3070 struct usb_interface *cintf;
3071 struct usb_driver *drv;
3072
3073 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3074 cintf = config->interface[i];
3075 if (cintf != iface)
3076 down(&cintf->dev.sem);
3077 if (device_is_registered(&cintf->dev) &&
3078 cintf->dev.driver) {
3079 drv = to_usb_driver(cintf->dev.driver);
3080 if (drv->pre_reset)
3081 (drv->pre_reset)(cintf);
3082 }
3083 }
3084 }
3085
3086 ret = usb_reset_device(udev);
3087
3088 if (config) {
3089 int i;
3090 struct usb_interface *cintf;
3091 struct usb_driver *drv;
3092
3093 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3094 cintf = config->interface[i];
3095 if (device_is_registered(&cintf->dev) &&
3096 cintf->dev.driver) {
3097 drv = to_usb_driver(cintf->dev.driver);
3098 if (drv->post_reset)
3099 (drv->post_reset)(cintf);
3100 }
3101 if (cintf != iface)
3102 up(&cintf->dev.sem);
3103 }
3104 }
3105
94fcda1f 3106 usb_autosuspend_device(udev);
79efa097
AS		 3107 return ret;
3108}
140d8f68 3109EXPORT_SYMBOL(usb_reset_composite_device);
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