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drivers/base/attribute_container.c: use mutex instead of binary semaphore
[deliverable/linux.git] / drivers / usb / core / hub.c
CommitLineData
1da177e4
LT		 1/*
2 * USB hub driver.
3 *
4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
8 *
9 */
10
1da177e4
LT		 11#include <linux/kernel.h>
12#include <linux/errno.h>
13#include <linux/module.h>
14#include <linux/moduleparam.h>
15#include <linux/completion.h>
16#include <linux/sched.h>
17#include <linux/list.h>
18#include <linux/slab.h>
19#include <linux/smp_lock.h>
20#include <linux/ioctl.h>
21#include <linux/usb.h>
22#include <linux/usbdevice_fs.h>
9c8d6178 23#include <linux/kthread.h>
4186ecf8 24#include <linux/mutex.h>
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
122#ifdef DEBUG
123static inline char *portspeed (int portstatus)
124{
125 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
126 return "480 Mb/s";
127 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
128 return "1.5 Mb/s";
129 else
130 return "12 Mb/s";
131}
132#endif
133
134/* Note that hdev or one of its children must be locked! */
135static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
136{
137 return usb_get_intfdata(hdev->actconfig->interface[0]);
138}
139
140/* USB 2.0 spec Section 11.24.4.5 */
141static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
142{
143 int i, ret;
144
145 for (i = 0; i < 3; i++) {
146 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
147 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
148 USB_DT_HUB << 8, 0, data, size,
149 USB_CTRL_GET_TIMEOUT);
150 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
151 return ret;
152 }
153 return -EINVAL;
154}
155
156/*
157 * USB 2.0 spec Section 11.24.2.1
158 */
159static int clear_hub_feature(struct usb_device *hdev, int feature)
160{
161 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
162 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
163}
164
165/*
166 * USB 2.0 spec Section 11.24.2.2
167 */
168static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
169{
170 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
171 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
172 NULL, 0, 1000);
173}
174
175/*
176 * USB 2.0 spec Section 11.24.2.13
177 */
178static int set_port_feature(struct usb_device *hdev, int port1, int feature)
179{
180 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
181 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
182 NULL, 0, 1000);
183}
184
185/*
186 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
187 * for info about using port indicators
188 */
189static void set_port_led(
190 struct usb_hub *hub,
191 int port1,
192 int selector
193)
194{
195 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
196 USB_PORT_FEAT_INDICATOR);
197 if (status < 0)
198 dev_dbg (hub->intfdev,
199 "port %d indicator %s status %d\n",
200 port1,
201 ({ char *s; switch (selector) {
202 case HUB_LED_AMBER: s = "amber"; break;
203 case HUB_LED_GREEN: s = "green"; break;
204 case HUB_LED_OFF: s = "off"; break;
205 case HUB_LED_AUTO: s = "auto"; break;
206 default: s = "??"; break;
207 }; s; }),
208 status);
209}
210
211#define LED_CYCLE_PERIOD ((2*HZ)/3)
212
c4028958 213static void led_work (struct work_struct *work)
1da177e4 214{
c4028958
DH		 215 struct usb_hub *hub =
216 container_of(work, struct usb_hub, leds.work);
1da177e4
LT		 217 struct usb_device *hdev = hub->hdev;
218 unsigned i;
219 unsigned changed = 0;
220 int cursor = -1;
221
222 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
223 return;
224
225 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
226 unsigned selector, mode;
227
228 /* 30%-50% duty cycle */
229
230 switch (hub->indicator[i]) {
231 /* cycle marker */
232 case INDICATOR_CYCLE:
233 cursor = i;
234 selector = HUB_LED_AUTO;
235 mode = INDICATOR_AUTO;
236 break;
237 /* blinking green = sw attention */
238 case INDICATOR_GREEN_BLINK:
239 selector = HUB_LED_GREEN;
240 mode = INDICATOR_GREEN_BLINK_OFF;
241 break;
242 case INDICATOR_GREEN_BLINK_OFF:
243 selector = HUB_LED_OFF;
244 mode = INDICATOR_GREEN_BLINK;
245 break;
246 /* blinking amber = hw attention */
247 case INDICATOR_AMBER_BLINK:
248 selector = HUB_LED_AMBER;
249 mode = INDICATOR_AMBER_BLINK_OFF;
250 break;
251 case INDICATOR_AMBER_BLINK_OFF:
252 selector = HUB_LED_OFF;
253 mode = INDICATOR_AMBER_BLINK;
254 break;
255 /* blink green/amber = reserved */
256 case INDICATOR_ALT_BLINK:
257 selector = HUB_LED_GREEN;
258 mode = INDICATOR_ALT_BLINK_OFF;
259 break;
260 case INDICATOR_ALT_BLINK_OFF:
261 selector = HUB_LED_AMBER;
262 mode = INDICATOR_ALT_BLINK;
263 break;
264 default:
265 continue;
266 }
267 if (selector != HUB_LED_AUTO)
268 changed = 1;
269 set_port_led(hub, i + 1, selector);
270 hub->indicator[i] = mode;
271 }
272 if (!changed && blinkenlights) {
273 cursor++;
274 cursor %= hub->descriptor->bNbrPorts;
275 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
276 hub->indicator[cursor] = INDICATOR_CYCLE;
277 changed++;
278 }
279 if (changed)
280 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
281}
282
283/* use a short timeout for hub/port status fetches */
284#define USB_STS_TIMEOUT 1000
285#define USB_STS_RETRIES 5
286
287/*
288 * USB 2.0 spec Section 11.24.2.6
289 */
290static int get_hub_status(struct usb_device *hdev,
291 struct usb_hub_status *data)
292{
293 int i, status = -ETIMEDOUT;
294
295 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
296 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
297 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
298 data, sizeof(*data), USB_STS_TIMEOUT);
299 }
300 return status;
301}
302
303/*
304 * USB 2.0 spec Section 11.24.2.7
305 */
306static int get_port_status(struct usb_device *hdev, int port1,
307 struct usb_port_status *data)
308{
309 int i, status = -ETIMEDOUT;
310
311 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
312 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
313 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
314 data, sizeof(*data), USB_STS_TIMEOUT);
315 }
316 return status;
317}
318
319static void kick_khubd(struct usb_hub *hub)
320{
321 unsigned long flags;
322
40f122f3
AS		 323 /* Suppress autosuspend until khubd runs */
324 to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
325
1da177e4
LT		 326 spin_lock_irqsave(&hub_event_lock, flags);
327 if (list_empty(&hub->event_list)) {
328 list_add_tail(&hub->event_list, &hub_event_list);
329 wake_up(&khubd_wait);
330 }
331 spin_unlock_irqrestore(&hub_event_lock, flags);
332}
333
334void usb_kick_khubd(struct usb_device *hdev)
335{
336 kick_khubd(hdev_to_hub(hdev));
337}
338
339
340/* completion function, fires on port status changes and various faults */
7d12e780 341static void hub_irq(struct urb *urb)
1da177e4 342{
ec17cf1c 343 struct usb_hub *hub = urb->context;
1da177e4
LT		 344 int status;
345 int i;
346 unsigned long bits;
347
348 switch (urb->status) {
349 case -ENOENT: /* synchronous unlink */
350 case -ECONNRESET: /* async unlink */
351 case -ESHUTDOWN: /* hardware going away */
352 return;
353
354 default: /* presumably an error */
355 /* Cause a hub reset after 10 consecutive errors */
356 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
357 if ((++hub->nerrors < 10) || hub->error)
358 goto resubmit;
359 hub->error = urb->status;
360 /* FALL THROUGH */
ec17cf1c 361
1da177e4
LT		 362 /* let khubd handle things */
363 case 0: /* we got data: port status changed */
364 bits = 0;
365 for (i = 0; i < urb->actual_length; ++i)
366 bits |= ((unsigned long) ((*hub->buffer)[i]))
367 << (i*8);
368 hub->event_bits[0] = bits;
369 break;
370 }
371
372 hub->nerrors = 0;
373
374 /* Something happened, let khubd figure it out */
375 kick_khubd(hub);
376
377resubmit:
378 if (hub->quiescing)
379 return;
380
381 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
382 && status != -ENODEV && status != -EPERM)
383 dev_err (hub->intfdev, "resubmit --> %d\n", status);
384}
385
386/* USB 2.0 spec Section 11.24.2.3 */
387static inline int
388hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
389{
390 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
391 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
392 tt, NULL, 0, 1000);
393}
394
395/*
396 * enumeration blocks khubd for a long time. we use keventd instead, since
397 * long blocking there is the exception, not the rule. accordingly, HCDs
398 * talking to TTs must queue control transfers (not just bulk and iso), so
399 * both can talk to the same hub concurrently.
400 */
c4028958 401static void hub_tt_kevent (struct work_struct *work)
1da177e4 402{
c4028958
DH		 403 struct usb_hub *hub =
404 container_of(work, struct usb_hub, tt.kevent);
1da177e4
LT		 405 unsigned long flags;
406
407 spin_lock_irqsave (&hub->tt.lock, flags);
408 while (!list_empty (&hub->tt.clear_list)) {
409 struct list_head *temp;
410 struct usb_tt_clear *clear;
411 struct usb_device *hdev = hub->hdev;
412 int status;
413
414 temp = hub->tt.clear_list.next;
415 clear = list_entry (temp, struct usb_tt_clear, clear_list);
416 list_del (&clear->clear_list);
417
418 /* drop lock so HCD can concurrently report other TT errors */
419 spin_unlock_irqrestore (&hub->tt.lock, flags);
420 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
421 spin_lock_irqsave (&hub->tt.lock, flags);
422
423 if (status)
424 dev_err (&hdev->dev,
425 "clear tt %d (%04x) error %d\n",
426 clear->tt, clear->devinfo, status);
1bc3c9e1 427 kfree(clear);
1da177e4
LT		 428 }
429 spin_unlock_irqrestore (&hub->tt.lock, flags);
430}
431
432/**
433 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
434 * @udev: the device whose split transaction failed
435 * @pipe: identifies the endpoint of the failed transaction
436 *
437 * High speed HCDs use this to tell the hub driver that some split control or
438 * bulk transaction failed in a way that requires clearing internal state of
439 * a transaction translator. This is normally detected (and reported) from
440 * interrupt context.
441 *
442 * It may not be possible for that hub to handle additional full (or low)
443 * speed transactions until that state is fully cleared out.
444 */
445void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
446{
447 struct usb_tt *tt = udev->tt;
448 unsigned long flags;
449 struct usb_tt_clear *clear;
450
451 /* we've got to cope with an arbitrary number of pending TT clears,
452 * since each TT has "at least two" buffers that can need it (and
453 * there can be many TTs per hub). even if they're uncommon.
454 */
54e6ecb2 455 if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
1da177e4
LT		 456 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
457 /* FIXME recover somehow ... RESET_TT? */
458 return;
459 }
460
461 /* info that CLEAR_TT_BUFFER needs */
462 clear->tt = tt->multi ? udev->ttport : 1;
463 clear->devinfo = usb_pipeendpoint (pipe);
464 clear->devinfo |= udev->devnum << 4;
465 clear->devinfo |= usb_pipecontrol (pipe)
466 ? (USB_ENDPOINT_XFER_CONTROL << 11)
467 : (USB_ENDPOINT_XFER_BULK << 11);
468 if (usb_pipein (pipe))
469 clear->devinfo |= 1 << 15;
470
471 /* tell keventd to clear state for this TT */
472 spin_lock_irqsave (&tt->lock, flags);
473 list_add_tail (&clear->clear_list, &tt->clear_list);
474 schedule_work (&tt->kevent);
475 spin_unlock_irqrestore (&tt->lock, flags);
476}
477
478static void hub_power_on(struct usb_hub *hub)
479{
480 int port1;
b789696a 481 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
4489a571
AS		 482 u16 wHubCharacteristics =
483 le16_to_cpu(hub->descriptor->wHubCharacteristics);
484
485 /* Enable power on each port. Some hubs have reserved values
486 * of LPSM (> 2) in their descriptors, even though they are
487 * USB 2.0 hubs. Some hubs do not implement port-power switching
488 * but only emulate it. In all cases, the ports won't work
489 * unless we send these messages to the hub.
490 */
491 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
1da177e4 492 dev_dbg(hub->intfdev, "enabling power on all ports\n");
4489a571
AS		 493 else
494 dev_dbg(hub->intfdev, "trying to enable port power on "
495 "non-switchable hub\n");
496 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
497 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
1da177e4 498
b789696a
DB		 499 /* Wait at least 100 msec for power to become stable */
500 msleep(max(pgood_delay, (unsigned) 100));
1da177e4
LT		 501}
502
02c399ee 503static void hub_quiesce(struct usb_hub *hub)
1da177e4 504{
979d5199 505 /* (nonblocking) khubd and related activity won't re-trigger */
1da177e4 506 hub->quiescing = 1;
c9f89fa4 507 hub->activating = 0;
979d5199 508
979d5199 509 /* (blocking) stop khubd and related activity */
1da177e4
LT		 510 usb_kill_urb(hub->urb);
511 if (hub->has_indicators)
512 cancel_delayed_work(&hub->leds);
513 if (hub->has_indicators || hub->tt.hub)
514 flush_scheduled_work();
515}
516
517static void hub_activate(struct usb_hub *hub)
518{
519 int status;
520
521 hub->quiescing = 0;
522 hub->activating = 1;
40f122f3 523
1da177e4
LT		 524 status = usb_submit_urb(hub->urb, GFP_NOIO);
525 if (status < 0)
526 dev_err(hub->intfdev, "activate --> %d\n", status);
527 if (hub->has_indicators && blinkenlights)
528 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
529
530 /* scan all ports ASAP */
531 kick_khubd(hub);
532}
533
534static int hub_hub_status(struct usb_hub *hub,
535 u16 *status, u16 *change)
536{
537 int ret;
538
db90e7a1 539 mutex_lock(&hub->status_mutex);
1da177e4
LT		 540 ret = get_hub_status(hub->hdev, &hub->status->hub);
541 if (ret < 0)
542 dev_err (hub->intfdev,
543 "%s failed (err = %d)\n", __FUNCTION__, ret);
544 else {
545 *status = le16_to_cpu(hub->status->hub.wHubStatus);
546 *change = le16_to_cpu(hub->status->hub.wHubChange);
547 ret = 0;
548 }
db90e7a1 549 mutex_unlock(&hub->status_mutex);
1da177e4
LT		 550 return ret;
551}
552
8b28c752
AS		 553static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
554{
555 struct usb_device *hdev = hub->hdev;
556 int ret;
557
558 if (hdev->children[port1-1] && set_state) {
559 usb_set_device_state(hdev->children[port1-1],
560 USB_STATE_NOTATTACHED);
561 }
562 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
563 if (ret)
564 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
565 port1, ret);
566
567 return ret;
568}
569
7d069b7d
AS		 570
571/* caller has locked the hub device */
7de18d8b 572static void hub_pre_reset(struct usb_interface *intf)
7d069b7d 573{
7de18d8b 574 struct usb_hub *hub = usb_get_intfdata(intf);
7d069b7d
AS		 575 struct usb_device *hdev = hub->hdev;
576 int port1;
577
578 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
579 if (hdev->children[port1 - 1]) {
580 usb_disconnect(&hdev->children[port1 - 1]);
7de18d8b 581 if (hub->error == 0)
7d069b7d
AS		 582 hub_port_disable(hub, port1, 0);
583 }
584 }
585 hub_quiesce(hub);
586}
587
588/* caller has locked the hub device */
7de18d8b 589static void hub_post_reset(struct usb_interface *intf)
7d069b7d 590{
7de18d8b
AS		 591 struct usb_hub *hub = usb_get_intfdata(intf);
592
7d069b7d
AS		 593 hub_activate(hub);
594 hub_power_on(hub);
595}
596
597
1da177e4
LT		 598static int hub_configure(struct usb_hub *hub,
599 struct usb_endpoint_descriptor *endpoint)
600{
601 struct usb_device *hdev = hub->hdev;
602 struct device *hub_dev = hub->intfdev;
603 u16 hubstatus, hubchange;
74ad9bd2 604 u16 wHubCharacteristics;
1da177e4
LT		 605 unsigned int pipe;
606 int maxp, ret;
607 char *message;
608
609 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
610 &hub->buffer_dma);
611 if (!hub->buffer) {
612 message = "can't allocate hub irq buffer";
613 ret = -ENOMEM;
614 goto fail;
615 }
616
617 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
618 if (!hub->status) {
619 message = "can't kmalloc hub status buffer";
620 ret = -ENOMEM;
621 goto fail;
622 }
db90e7a1 623 mutex_init(&hub->status_mutex);
1da177e4
LT		 624
625 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
626 if (!hub->descriptor) {
627 message = "can't kmalloc hub descriptor";
628 ret = -ENOMEM;
629 goto fail;
630 }
631
632 /* Request the entire hub descriptor.
633 * hub->descriptor can handle USB_MAXCHILDREN ports,
634 * but the hub can/will return fewer bytes here.
635 */
636 ret = get_hub_descriptor(hdev, hub->descriptor,
637 sizeof(*hub->descriptor));
638 if (ret < 0) {
639 message = "can't read hub descriptor";
640 goto fail;
641 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
642 message = "hub has too many ports!";
643 ret = -ENODEV;
644 goto fail;
645 }
646
647 hdev->maxchild = hub->descriptor->bNbrPorts;
648 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
649 (hdev->maxchild == 1) ? "" : "s");
650
74ad9bd2 651 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4 652
74ad9bd2 653 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
1da177e4
LT		 654 int i;
655 char portstr [USB_MAXCHILDREN + 1];
656
657 for (i = 0; i < hdev->maxchild; i++)
658 portstr[i] = hub->descriptor->DeviceRemovable
659 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
660 ? 'F' : 'R';
661 portstr[hdev->maxchild] = 0;
662 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
663 } else
664 dev_dbg(hub_dev, "standalone hub\n");
665
74ad9bd2 666 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1da177e4
LT		 667 case 0x00:
668 dev_dbg(hub_dev, "ganged power switching\n");
669 break;
670 case 0x01:
671 dev_dbg(hub_dev, "individual port power switching\n");
672 break;
673 case 0x02:
674 case 0x03:
675 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
676 break;
677 }
678
74ad9bd2 679 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1da177e4
LT		 680 case 0x00:
681 dev_dbg(hub_dev, "global over-current protection\n");
682 break;
683 case 0x08:
684 dev_dbg(hub_dev, "individual port over-current protection\n");
685 break;
686 case 0x10:
687 case 0x18:
688 dev_dbg(hub_dev, "no over-current protection\n");
689 break;
690 }
691
692 spin_lock_init (&hub->tt.lock);
693 INIT_LIST_HEAD (&hub->tt.clear_list);
c4028958 694 INIT_WORK (&hub->tt.kevent, hub_tt_kevent);
1da177e4
LT		 695 switch (hdev->descriptor.bDeviceProtocol) {
696 case 0:
697 break;
698 case 1:
699 dev_dbg(hub_dev, "Single TT\n");
700 hub->tt.hub = hdev;
701 break;
702 case 2:
703 ret = usb_set_interface(hdev, 0, 1);
704 if (ret == 0) {
705 dev_dbg(hub_dev, "TT per port\n");
706 hub->tt.multi = 1;
707 } else
708 dev_err(hub_dev, "Using single TT (err %d)\n",
709 ret);
710 hub->tt.hub = hdev;
711 break;
712 default:
713 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
714 hdev->descriptor.bDeviceProtocol);
715 break;
716 }
717
e09711ae 718 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
74ad9bd2 719 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
e09711ae 720 case HUB_TTTT_8_BITS:
721 if (hdev->descriptor.bDeviceProtocol != 0) {
722 hub->tt.think_time = 666;
723 dev_dbg(hub_dev, "TT requires at most %d "
724 "FS bit times (%d ns)\n",
725 8, hub->tt.think_time);
726 }
1da177e4 727 break;
e09711ae 728 case HUB_TTTT_16_BITS:
729 hub->tt.think_time = 666 * 2;
730 dev_dbg(hub_dev, "TT requires at most %d "
731 "FS bit times (%d ns)\n",
732 16, hub->tt.think_time);
1da177e4 733 break;
e09711ae 734 case HUB_TTTT_24_BITS:
735 hub->tt.think_time = 666 * 3;
736 dev_dbg(hub_dev, "TT requires at most %d "
737 "FS bit times (%d ns)\n",
738 24, hub->tt.think_time);
1da177e4 739 break;
e09711ae 740 case HUB_TTTT_32_BITS:
741 hub->tt.think_time = 666 * 4;
742 dev_dbg(hub_dev, "TT requires at most %d "
743 "FS bit times (%d ns)\n",
744 32, hub->tt.think_time);
1da177e4
LT		 745 break;
746 }
747
748 /* probe() zeroes hub->indicator[] */
74ad9bd2 749 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1da177e4
LT		 750 hub->has_indicators = 1;
751 dev_dbg(hub_dev, "Port indicators are supported\n");
752 }
753
754 dev_dbg(hub_dev, "power on to power good time: %dms\n",
755 hub->descriptor->bPwrOn2PwrGood * 2);
756
757 /* power budgeting mostly matters with bus-powered hubs,
758 * and battery-powered root hubs (may provide just 8 mA).
759 */
760 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
55c52718 761 if (ret < 2) {
1da177e4
LT		 762 message = "can't get hub status";
763 goto fail;
764 }
7d35b929
AS		 765 le16_to_cpus(&hubstatus);
766 if (hdev == hdev->bus->root_hub) {
55c52718
AS		 767 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
768 hub->mA_per_port = 500;
769 else {
770 hub->mA_per_port = hdev->bus_mA;
771 hub->limited_power = 1;
772 }
7d35b929 773 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1da177e4
LT		 774 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
775 hub->descriptor->bHubContrCurrent);
55c52718
AS		 776 hub->limited_power = 1;
777 if (hdev->maxchild > 0) {
778 int remaining = hdev->bus_mA -
779 hub->descriptor->bHubContrCurrent;
780
781 if (remaining < hdev->maxchild * 100)
782 dev_warn(hub_dev,
783 "insufficient power available "
784 "to use all downstream ports\n");
785 hub->mA_per_port = 100; /* 7.2.1.1 */
786 }
787 } else { /* Self-powered external hub */
788 /* FIXME: What about battery-powered external hubs that
789 * provide less current per port? */
790 hub->mA_per_port = 500;
7d35b929 791 }
55c52718
AS		 792 if (hub->mA_per_port < 500)
793 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
794 hub->mA_per_port);
1da177e4
LT		 795
796 ret = hub_hub_status(hub, &hubstatus, &hubchange);
797 if (ret < 0) {
798 message = "can't get hub status";
799 goto fail;
800 }
801
802 /* local power status reports aren't always correct */
803 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
804 dev_dbg(hub_dev, "local power source is %s\n",
805 (hubstatus & HUB_STATUS_LOCAL_POWER)
806 ? "lost (inactive)" : "good");
807
74ad9bd2 808 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1da177e4
LT		 809 dev_dbg(hub_dev, "%sover-current condition exists\n",
810 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
811
88fafff9 812 /* set up the interrupt endpoint
813 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
814 * bytes as USB2.0[11.12.3] says because some hubs are known
815 * to send more data (and thus cause overflow). For root hubs,
816 * maxpktsize is defined in hcd.c's fake endpoint descriptors
817 * to be big enough for at least USB_MAXCHILDREN ports. */
1da177e4
LT		 818 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
819 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
820
821 if (maxp > sizeof(*hub->buffer))
822 maxp = sizeof(*hub->buffer);
823
824 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
825 if (!hub->urb) {
826 message = "couldn't allocate interrupt urb";
827 ret = -ENOMEM;
828 goto fail;
829 }
830
831 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
832 hub, endpoint->bInterval);
833 hub->urb->transfer_dma = hub->buffer_dma;
834 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
835
836 /* maybe cycle the hub leds */
837 if (hub->has_indicators && blinkenlights)
838 hub->indicator [0] = INDICATOR_CYCLE;
839
840 hub_power_on(hub);
841 hub_activate(hub);
842 return 0;
843
844fail:
845 dev_err (hub_dev, "config failed, %s (err %d)\n",
846 message, ret);
847 /* hub_disconnect() frees urb and descriptor */
848 return ret;
849}
850
851static unsigned highspeed_hubs;
852
853static void hub_disconnect(struct usb_interface *intf)
854{
855 struct usb_hub *hub = usb_get_intfdata (intf);
856 struct usb_device *hdev;
857
7de18d8b
AS		 858 /* Disconnect all children and quiesce the hub */
859 hub->error = 0;
860 hub_pre_reset(intf);
861
8b28c752 862 usb_set_intfdata (intf, NULL);
1da177e4
LT		 863 hdev = hub->hdev;
864
865 if (hdev->speed == USB_SPEED_HIGH)
866 highspeed_hubs--;
867
1da177e4
LT		 868 usb_free_urb(hub->urb);
869 hub->urb = NULL;
870
871 spin_lock_irq(&hub_event_lock);
872 list_del_init(&hub->event_list);
873 spin_unlock_irq(&hub_event_lock);
874
1bc3c9e1
JJ		 875 kfree(hub->descriptor);
876 hub->descriptor = NULL;
1da177e4 877
1bc3c9e1
JJ		 878 kfree(hub->status);
879 hub->status = NULL;
1da177e4
LT		 880
881 if (hub->buffer) {
882 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
883 hub->buffer_dma);
884 hub->buffer = NULL;
885 }
886
7d069b7d 887 kfree(hub);
1da177e4
LT		 888}
889
890static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
891{
892 struct usb_host_interface *desc;
893 struct usb_endpoint_descriptor *endpoint;
894 struct usb_device *hdev;
895 struct usb_hub *hub;
896
897 desc = intf->cur_altsetting;
898 hdev = interface_to_usbdev(intf);
899
89ccbdc9
DB		 900#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
901 if (hdev->parent) {
902 dev_warn(&intf->dev, "ignoring external hub\n");
903 return -ENODEV;
904 }
905#endif
906
1da177e4
LT		 907 /* Some hubs have a subclass of 1, which AFAICT according to the */
908 /* specs is not defined, but it works */
909 if ((desc->desc.bInterfaceSubClass != 0) &&
910 (desc->desc.bInterfaceSubClass != 1)) {
911descriptor_error:
912 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
913 return -EIO;
914 }
915
916 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
917 if (desc->desc.bNumEndpoints != 1)
918 goto descriptor_error;
919
920 endpoint = &desc->endpoint[0].desc;
921
fbf81c29
LFC		 922 /* If it's not an interrupt in endpoint, we'd better punt! */
923 if (!usb_endpoint_is_int_in(endpoint))
1da177e4
LT		 924 goto descriptor_error;
925
926 /* We found a hub */
927 dev_info (&intf->dev, "USB hub found\n");
928
0a1ef3b5 929 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1da177e4
LT		 930 if (!hub) {
931 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
932 return -ENOMEM;
933 }
934
1da177e4
LT		 935 INIT_LIST_HEAD(&hub->event_list);
936 hub->intfdev = &intf->dev;
937 hub->hdev = hdev;
c4028958 938 INIT_DELAYED_WORK(&hub->leds, led_work);
1da177e4
LT		 939
940 usb_set_intfdata (intf, hub);
40f122f3 941 intf->needs_remote_wakeup = 1;
1da177e4
LT		 942
943 if (hdev->speed == USB_SPEED_HIGH)
944 highspeed_hubs++;
945
946 if (hub_configure(hub, endpoint) >= 0)
947 return 0;
948
949 hub_disconnect (intf);
950 return -ENODEV;
951}
952
953static int
954hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
955{
956 struct usb_device *hdev = interface_to_usbdev (intf);
957
958 /* assert ifno == 0 (part of hub spec) */
959 switch (code) {
960 case USBDEVFS_HUB_PORTINFO: {
961 struct usbdevfs_hub_portinfo *info = user_data;
962 int i;
963
964 spin_lock_irq(&device_state_lock);
965 if (hdev->devnum <= 0)
966 info->nports = 0;
967 else {
968 info->nports = hdev->maxchild;
969 for (i = 0; i < info->nports; i++) {
970 if (hdev->children[i] == NULL)
971 info->port[i] = 0;
972 else
973 info->port[i] =
974 hdev->children[i]->devnum;
975 }
976 }
977 spin_unlock_irq(&device_state_lock);
978
979 return info->nports + 1;
980 }
981
982 default:
983 return -ENOSYS;
984 }
985}
986
1da177e4
LT		 987
988/* grab device/port lock, returning index of that port (zero based).
989 * protects the upstream link used by this device from concurrent
990 * tree operations like suspend, resume, reset, and disconnect, which
991 * apply to everything downstream of a given port.
992 */
993static int locktree(struct usb_device *udev)
994{
995 int t;
996 struct usb_device *hdev;
997
998 if (!udev)
999 return -ENODEV;
1000
1001 /* root hub is always the first lock in the series */
1002 hdev = udev->parent;
1003 if (!hdev) {
1004 usb_lock_device(udev);
1005 return 0;
1006 }
1007
1008 /* on the path from root to us, lock everything from
1009 * top down, dropping parent locks when not needed
1010 */
1011 t = locktree(hdev);
1012 if (t < 0)
1013 return t;
1da177e4 1014
12c3da34
AS		 1015 /* everything is fail-fast once disconnect
1016 * processing starts
1017 */
1018 if (udev->state == USB_STATE_NOTATTACHED) {
1019 usb_unlock_device(hdev);
1020 return -ENODEV;
1da177e4 1021 }
12c3da34
AS		 1022
1023 /* when everyone grabs locks top->bottom,
1024 * non-overlapping work may be concurrent
1025 */
1026 usb_lock_device(udev);
1da177e4 1027 usb_unlock_device(hdev);
12c3da34 1028 return udev->portnum;
1da177e4
LT		 1029}
1030
1031static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1032{
1033 int i;
1034
1035 for (i = 0; i < udev->maxchild; ++i) {
1036 if (udev->children[i])
1037 recursively_mark_NOTATTACHED(udev->children[i]);
1038 }
ee49fb5d
AS		 1039 if (udev->state == USB_STATE_SUSPENDED)
1040 udev->discon_suspended = 1;
1da177e4
LT		 1041 udev->state = USB_STATE_NOTATTACHED;
1042}
1043
1044/**
1045 * usb_set_device_state - change a device's current state (usbcore, hcds)
1046 * @udev: pointer to device whose state should be changed
1047 * @new_state: new state value to be stored
1048 *
1049 * udev->state is _not_ fully protected by the device lock. Although
1050 * most transitions are made only while holding the lock, the state can
1051 * can change to USB_STATE_NOTATTACHED at almost any time. This
1052 * is so that devices can be marked as disconnected as soon as possible,
1053 * without having to wait for any semaphores to be released. As a result,
1054 * all changes to any device's state must be protected by the
1055 * device_state_lock spinlock.
1056 *
1057 * Once a device has been added to the device tree, all changes to its state
1058 * should be made using this routine. The state should _not_ be set directly.
1059 *
1060 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1061 * Otherwise udev->state is set to new_state, and if new_state is
1062 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1063 * to USB_STATE_NOTATTACHED.
1064 */
1065void usb_set_device_state(struct usb_device *udev,
1066 enum usb_device_state new_state)
1067{
1068 unsigned long flags;
1069
1070 spin_lock_irqsave(&device_state_lock, flags);
1071 if (udev->state == USB_STATE_NOTATTACHED)
1072 ; /* do nothing */
b94dc6b5 1073 else if (new_state != USB_STATE_NOTATTACHED) {
fb669cc0
DB		 1074
1075 /* root hub wakeup capabilities are managed out-of-band
1076 * and may involve silicon errata ... ignore them here.
1077 */
1078 if (udev->parent) {
645daaab
AS		 1079 if (udev->state == USB_STATE_SUSPENDED
1080 || new_state == USB_STATE_SUSPENDED)
1081 ; /* No change to wakeup settings */
1082 else if (new_state == USB_STATE_CONFIGURED)
fb669cc0
DB		 1083 device_init_wakeup(&udev->dev,
1084 (udev->actconfig->desc.bmAttributes
1085 & USB_CONFIG_ATT_WAKEUP));
645daaab 1086 else
fb669cc0
DB		 1087 device_init_wakeup(&udev->dev, 0);
1088 }
645daaab 1089 udev->state = new_state;
b94dc6b5 1090 } else
1da177e4
LT		 1091 recursively_mark_NOTATTACHED(udev);
1092 spin_unlock_irqrestore(&device_state_lock, flags);
1093}
1da177e4
LT		 1094
1095
d388dab7 1096#ifdef CONFIG_PM
1c50c317
AS		 1097
1098/**
1099 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1100 * @rhdev: struct usb_device for the root hub
1101 *
1102 * The USB host controller driver calls this function when its root hub
1103 * is resumed and Vbus power has been interrupted or the controller
1104 * has been reset. The routine marks all the children of the root hub
1105 * as NOTATTACHED and marks logical connect-change events on their ports.
1106 */
1107void usb_root_hub_lost_power(struct usb_device *rhdev)
1108{
1109 struct usb_hub *hub;
1110 int port1;
1111 unsigned long flags;
1112
1113 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
353a4098
AS		 1114
1115 /* Make sure no potential wakeup events get lost,
1116 * by forcing the root hub to be resumed.
1117 */
1118 rhdev->dev.power.prev_state.event = PM_EVENT_ON;
1119
1c50c317
AS		 1120 spin_lock_irqsave(&device_state_lock, flags);
1121 hub = hdev_to_hub(rhdev);
1122 for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
1123 if (rhdev->children[port1 - 1]) {
1124 recursively_mark_NOTATTACHED(
1125 rhdev->children[port1 - 1]);
1126 set_bit(port1, hub->change_bits);
1127 }
1128 }
1129 spin_unlock_irqrestore(&device_state_lock, flags);
1130}
1131EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1132
d388dab7 1133#endif /* CONFIG_PM */
1c50c317 1134
1da177e4
LT		 1135static void choose_address(struct usb_device *udev)
1136{
1137 int devnum;
1138 struct usb_bus *bus = udev->bus;
1139
1140 /* If khubd ever becomes multithreaded, this will need a lock */
1141
1142 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1143 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1144 bus->devnum_next);
1145 if (devnum >= 128)
1146 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1147
1148 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1149
1150 if (devnum < 128) {
1151 set_bit(devnum, bus->devmap.devicemap);
1152 udev->devnum = devnum;
1153 }
1154}
1155
1156static void release_address(struct usb_device *udev)
1157{
1158 if (udev->devnum > 0) {
1159 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1160 udev->devnum = -1;
1161 }
1162}
1163
1164/**
1165 * usb_disconnect - disconnect a device (usbcore-internal)
1166 * @pdev: pointer to device being disconnected
1167 * Context: !in_interrupt ()
1168 *
1169 * Something got disconnected. Get rid of it and all of its children.
1170 *
1171 * If *pdev is a normal device then the parent hub must already be locked.
1172 * If *pdev is a root hub then this routine will acquire the
1173 * usb_bus_list_lock on behalf of the caller.
1174 *
1175 * Only hub drivers (including virtual root hub drivers for host
1176 * controllers) should ever call this.
1177 *
1178 * This call is synchronous, and may not be used in an interrupt context.
1179 */
1180void usb_disconnect(struct usb_device **pdev)
1181{
1182 struct usb_device *udev = *pdev;
1183 int i;
1184
1185 if (!udev) {
1186 pr_debug ("%s nodev\n", __FUNCTION__);
1187 return;
1188 }
1189
1190 /* mark the device as inactive, so any further urb submissions for
1191 * this device (and any of its children) will fail immediately.
1192 * this quiesces everyting except pending urbs.
1193 */
1194 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1da177e4
LT		 1195 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1196
9ad3d6cc
AS		 1197 usb_lock_device(udev);
1198
1da177e4
LT		 1199 /* Free up all the children before we remove this device */
1200 for (i = 0; i < USB_MAXCHILDREN; i++) {
1201 if (udev->children[i])
1202 usb_disconnect(&udev->children[i]);
1203 }
1204
1205 /* deallocate hcd/hardware state ... nuking all pending urbs and
1206 * cleaning up all state associated with the current configuration
1207 * so that the hardware is now fully quiesced.
1208 */
782da727 1209 dev_dbg (&udev->dev, "unregistering device\n");
1da177e4
LT		 1210 usb_disable_device(udev, 0);
1211
782da727
AS		 1212 usb_unlock_device(udev);
1213
1214 /* Unregister the device. The device driver is responsible
1215 * for removing the device files from usbfs and sysfs and for
1216 * de-configuring the device.
1217 */
1218 device_del(&udev->dev);
3099e75a 1219
782da727 1220 /* Free the device number and delete the parent's children[]
1da177e4
LT		 1221 * (or root_hub) pointer.
1222 */
1da177e4 1223 release_address(udev);
1da177e4
LT		 1224
1225 /* Avoid races with recursively_mark_NOTATTACHED() */
1226 spin_lock_irq(&device_state_lock);
1227 *pdev = NULL;
1228 spin_unlock_irq(&device_state_lock);
1229
ee49fb5d
AS		 1230 /* Decrement the parent's count of unsuspended children */
1231 if (udev->parent) {
1232 usb_pm_lock(udev);
1233 if (!udev->discon_suspended)
94fcda1f 1234 usb_autosuspend_device(udev->parent);
ee49fb5d
AS		 1235 usb_pm_unlock(udev);
1236 }
1237
782da727 1238 put_device(&udev->dev);
1da177e4
LT		 1239}
1240
1241#ifdef DEBUG
1242static void show_string(struct usb_device *udev, char *id, char *string)
1243{
1244 if (!string)
1245 return;
1246 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1247}
1248
1249#else
1250static inline void show_string(struct usb_device *udev, char *id, char *string)
1251{}
1252#endif
1253
1da177e4
LT		 1254
1255#ifdef CONFIG_USB_OTG
1256#include "otg_whitelist.h"
11bd44ab 1257static int __usb_port_suspend(struct usb_device *, int port1);
1da177e4
LT		 1258#endif
1259
3ede760f
ON		 1260/**
1261 * usb_new_device - perform initial device setup (usbcore-internal)
1262 * @udev: newly addressed device (in ADDRESS state)
1263 *
1264 * This is called with devices which have been enumerated, but not yet
1265 * configured. The device descriptor is available, but not descriptors
1266 * for any device configuration. The caller must have locked either
1267 * the parent hub (if udev is a normal device) or else the
1268 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1269 * udev has already been installed, but udev is not yet visible through
1270 * sysfs or other filesystem code.
1271 *
1272 * It will return if the device is configured properly or not. Zero if
1273 * the interface was registered with the driver core; else a negative
1274 * errno value.
1275 *
1276 * This call is synchronous, and may not be used in an interrupt context.
1277 *
1278 * Only the hub driver or root-hub registrar should ever call this.
1279 */
1280int usb_new_device(struct usb_device *udev)
1da177e4
LT		 1281{
1282 int err;
1da177e4 1283
7ceec1f1
ON		 1284 /* Determine quirks */
1285 usb_detect_quirks(udev);
1286
1da177e4
LT		 1287 err = usb_get_configuration(udev);
1288 if (err < 0) {
1289 dev_err(&udev->dev, "can't read configurations, error %d\n",
1290 err);
1291 goto fail;
1292 }
1293
1294 /* read the standard strings and cache them if present */
4f62efe6
AS		 1295 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1296 udev->manufacturer = usb_cache_string(udev,
1297 udev->descriptor.iManufacturer);
1298 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1da177e4
LT		 1299
1300 /* Tell the world! */
1301 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1302 "SerialNumber=%d\n",
1303 udev->descriptor.iManufacturer,
1304 udev->descriptor.iProduct,
1305 udev->descriptor.iSerialNumber);
1306 show_string(udev, "Product", udev->product);
1307 show_string(udev, "Manufacturer", udev->manufacturer);
1308 show_string(udev, "SerialNumber", udev->serial);
1309
1310#ifdef CONFIG_USB_OTG
1311 /*
1312 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1313 * to wake us after we've powered off VBUS; and HNP, switching roles
1314 * "host" to "peripheral". The OTG descriptor helps figure this out.
1315 */
1316 if (!udev->bus->is_b_host
1317 && udev->config
1318 && udev->parent == udev->bus->root_hub) {
1319 struct usb_otg_descriptor *desc = 0;
1320 struct usb_bus *bus = udev->bus;
1321
1322 /* descriptor may appear anywhere in config */
1323 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1324 le16_to_cpu(udev->config[0].desc.wTotalLength),
1325 USB_DT_OTG, (void **) &desc) == 0) {
1326 if (desc->bmAttributes & USB_OTG_HNP) {
12c3da34 1327 unsigned port1 = udev->portnum;
fc849b85 1328
1da177e4
LT		 1329 dev_info(&udev->dev,
1330 "Dual-Role OTG device on %sHNP port\n",
1331 (port1 == bus->otg_port)
1332 ? "" : "non-");
1333
1334 /* enable HNP before suspend, it's simpler */
1335 if (port1 == bus->otg_port)
1336 bus->b_hnp_enable = 1;
1337 err = usb_control_msg(udev,
1338 usb_sndctrlpipe(udev, 0),
1339 USB_REQ_SET_FEATURE, 0,
1340 bus->b_hnp_enable
1341 ? USB_DEVICE_B_HNP_ENABLE
1342 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1343 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1344 if (err < 0) {
1345 /* OTG MESSAGE: report errors here,
1346 * customize to match your product.
1347 */
1348 dev_info(&udev->dev,
1349 "can't set HNP mode; %d\n",
1350 err);
1351 bus->b_hnp_enable = 0;
1352 }
1353 }
1354 }
1355 }
1356
1357 if (!is_targeted(udev)) {
1358
1359 /* Maybe it can talk to us, though we can't talk to it.
1360 * (Includes HNP test device.)
1361 */
1362 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
140d8f68 1363 err = __usb_port_suspend(udev, udev->bus->otg_port);
1da177e4
LT		 1364 if (err < 0)
1365 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1366 }
1367 err = -ENODEV;
1368 goto fail;
1369 }
1370#endif
1371
782da727
AS		 1372 /* Register the device. The device driver is responsible
1373 * for adding the device files to usbfs and sysfs and for
1374 * configuring the device.
1375 */
1da177e4
LT		 1376 err = device_add (&udev->dev);
1377 if (err) {
1378 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1379 goto fail;
1380 }
9ad3d6cc 1381
ee49fb5d
AS		 1382 /* Increment the parent's count of unsuspended children */
1383 if (udev->parent)
94fcda1f 1384 usb_autoresume_device(udev->parent);
ee49fb5d 1385
c066475e 1386exit:
c066475e 1387 return err;
1da177e4
LT		 1388
1389fail:
1390 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
c066475e 1391 goto exit;
1da177e4
LT		 1392}
1393
1da177e4
LT		 1394static int hub_port_status(struct usb_hub *hub, int port1,
1395 u16 *status, u16 *change)
1396{
1397 int ret;
1398
db90e7a1 1399 mutex_lock(&hub->status_mutex);
1da177e4 1400 ret = get_port_status(hub->hdev, port1, &hub->status->port);
d25450c6 1401 if (ret < 4) {
1da177e4
LT		 1402 dev_err (hub->intfdev,
1403 "%s failed (err = %d)\n", __FUNCTION__, ret);
d25450c6
AS		 1404 if (ret >= 0)
1405 ret = -EIO;
1406 } else {
1da177e4
LT		 1407 *status = le16_to_cpu(hub->status->port.wPortStatus);
1408 *change = le16_to_cpu(hub->status->port.wPortChange);
1409 ret = 0;
1410 }
db90e7a1 1411 mutex_unlock(&hub->status_mutex);
1da177e4
LT		 1412 return ret;
1413}
1414
0165de09
IPG		 1415
1416/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1417static unsigned hub_is_wusb(struct usb_hub *hub)
1418{
1419 struct usb_hcd *hcd;
1420 if (hub->hdev->parent != NULL) /* not a root hub? */
1421 return 0;
1422 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1423 return hcd->wireless;
1424}
1425
1426
1da177e4
LT		 1427#define PORT_RESET_TRIES 5
1428#define SET_ADDRESS_TRIES 2
1429#define GET_DESCRIPTOR_TRIES 2
1430#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1431#define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1432
1433#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1434#define HUB_SHORT_RESET_TIME 10
1435#define HUB_LONG_RESET_TIME 200
1436#define HUB_RESET_TIMEOUT 500
1437
1438static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1439 struct usb_device *udev, unsigned int delay)
1440{
1441 int delay_time, ret;
1442 u16 portstatus;
1443 u16 portchange;
1444
1445 for (delay_time = 0;
1446 delay_time < HUB_RESET_TIMEOUT;
1447 delay_time += delay) {
1448 /* wait to give the device a chance to reset */
1449 msleep(delay);
1450
1451 /* read and decode port status */
1452 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1453 if (ret < 0)
1454 return ret;
1455
1456 /* Device went away? */
1457 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1458 return -ENOTCONN;
1459
1460 /* bomb out completely if something weird happened */
1461 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1462 return -EINVAL;
1463
1464 /* if we`ve finished resetting, then break out of the loop */
1465 if (!(portstatus & USB_PORT_STAT_RESET) &&
1466 (portstatus & USB_PORT_STAT_ENABLE)) {
0165de09
IPG		 1467 if (hub_is_wusb(hub))
1468 udev->speed = USB_SPEED_VARIABLE;
1469 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1da177e4
LT		 1470 udev->speed = USB_SPEED_HIGH;
1471 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1472 udev->speed = USB_SPEED_LOW;
1473 else
1474 udev->speed = USB_SPEED_FULL;
1475 return 0;
1476 }
1477
1478 /* switch to the long delay after two short delay failures */
1479 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1480 delay = HUB_LONG_RESET_TIME;
1481
1482 dev_dbg (hub->intfdev,
1483 "port %d not reset yet, waiting %dms\n",
1484 port1, delay);
1485 }
1486
1487 return -EBUSY;
1488}
1489
1490static int hub_port_reset(struct usb_hub *hub, int port1,
1491 struct usb_device *udev, unsigned int delay)
1492{
1493 int i, status;
1494
1495 /* Reset the port */
1496 for (i = 0; i < PORT_RESET_TRIES; i++) {
1497 status = set_port_feature(hub->hdev,
1498 port1, USB_PORT_FEAT_RESET);
1499 if (status)
1500 dev_err(hub->intfdev,
1501 "cannot reset port %d (err = %d)\n",
1502 port1, status);
1503 else {
1504 status = hub_port_wait_reset(hub, port1, udev, delay);
dd16525b 1505 if (status && status != -ENOTCONN)
1da177e4
LT		 1506 dev_dbg(hub->intfdev,
1507 "port_wait_reset: err = %d\n",
1508 status);
1509 }
1510
1511 /* return on disconnect or reset */
1512 switch (status) {
1513 case 0:
b789696a
DB		 1514 /* TRSTRCY = 10 ms; plus some extra */
1515 msleep(10 + 40);
1da177e4
LT		 1516 /* FALL THROUGH */
1517 case -ENOTCONN:
1518 case -ENODEV:
1519 clear_port_feature(hub->hdev,
1520 port1, USB_PORT_FEAT_C_RESET);
1521 /* FIXME need disconnect() for NOTATTACHED device */
1522 usb_set_device_state(udev, status
1523 ? USB_STATE_NOTATTACHED
1524 : USB_STATE_DEFAULT);
1525 return status;
1526 }
1527
1528 dev_dbg (hub->intfdev,
1529 "port %d not enabled, trying reset again...\n",
1530 port1);
1531 delay = HUB_LONG_RESET_TIME;
1532 }
1533
1534 dev_err (hub->intfdev,
1535 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1536 port1);
1537
1538 return status;
1539}
1540
1da177e4
LT		 1541/*
1542 * Disable a port and mark a logical connnect-change event, so that some
1543 * time later khubd will disconnect() any existing usb_device on the port
1544 * and will re-enumerate if there actually is a device attached.
1545 */
1546static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1547{
1548 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1549 hub_port_disable(hub, port1, 1);
1550
1551 /* FIXME let caller ask to power down the port:
1552 * - some devices won't enumerate without a VBUS power cycle
1553 * - SRP saves power that way
390a8c34 1554 * - ... new call, TBD ...
1da177e4
LT		 1555 * That's easy if this hub can switch power per-port, and
1556 * khubd reactivates the port later (timer, SRP, etc).
1557 * Powerdown must be optional, because of reset/DFU.
1558 */
1559
1560 set_bit(port1, hub->change_bits);
1561 kick_khubd(hub);
1562}
1563
d388dab7 1564#ifdef CONFIG_PM
1da177e4
LT		 1565
1566#ifdef CONFIG_USB_SUSPEND
1567
1568/*
1569 * Selective port suspend reduces power; most suspended devices draw
1570 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1571 * All devices below the suspended port are also suspended.
1572 *
1573 * Devices leave suspend state when the host wakes them up. Some devices
1574 * also support "remote wakeup", where the device can activate the USB
1575 * tree above them to deliver data, such as a keypress or packet. In
1576 * some cases, this wakes the USB host.
1577 */
1578static int hub_port_suspend(struct usb_hub *hub, int port1,
1579 struct usb_device *udev)
1580{
1581 int status;
1582
1583 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1584
1585 /* enable remote wakeup when appropriate; this lets the device
1586 * wake up the upstream hub (including maybe the root hub).
1587 *
1588 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1589 * we don't explicitly enable it here.
1590 */
645daaab 1591 if (udev->do_remote_wakeup) {
1da177e4
LT		 1592 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1593 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1594 USB_DEVICE_REMOTE_WAKEUP, 0,
1595 NULL, 0,
1596 USB_CTRL_SET_TIMEOUT);
1597 if (status)
1598 dev_dbg(&udev->dev,
1599 "won't remote wakeup, status %d\n",
1600 status);
1601 }
1602
1603 /* see 7.1.7.6 */
1604 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1605 if (status) {
1606 dev_dbg(hub->intfdev,
1607 "can't suspend port %d, status %d\n",
1608 port1, status);
1609 /* paranoia: "should not happen" */
1610 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1611 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1612 USB_DEVICE_REMOTE_WAKEUP, 0,
1613 NULL, 0,
1614 USB_CTRL_SET_TIMEOUT);
1615 } else {
1616 /* device has up to 10 msec to fully suspend */
645daaab
AS		 1617 dev_dbg(&udev->dev, "usb %ssuspend\n",
1618 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1619 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1620 msleep(10);
1621 }
1622 return status;
1623}
1624
1625/*
1626 * Devices on USB hub ports have only one "suspend" state, corresponding
ba9d35fb 1627 * to ACPI D2, "may cause the device to lose some context".
1da177e4
LT		 1628 * State transitions include:
1629 *
1630 * - suspend, resume ... when the VBUS power link stays live
1631 * - suspend, disconnect ... VBUS lost
1632 *
1633 * Once VBUS drop breaks the circuit, the port it's using has to go through
1634 * normal re-enumeration procedures, starting with enabling VBUS power.
1635 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1636 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1637 * timer, no SRP, no requests through sysfs.
390a8c34
DB		 1638 *
1639 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1640 * the root hub for their bus goes into global suspend ... so we don't
1641 * (falsely) update the device power state to say it suspended.
1da177e4 1642 */
140d8f68 1643static int __usb_port_suspend (struct usb_device *udev, int port1)
1da177e4 1644{
f3f3253d 1645 int status = 0;
1da177e4
LT		 1646
1647 /* caller owns the udev device lock */
1648 if (port1 < 0)
1649 return port1;
1650
140d8f68
AS		 1651 /* we change the device's upstream USB link,
1652 * but root hubs have no upstream USB link.
1da177e4 1653 */
f3f3253d 1654 if (udev->parent)
1da177e4
LT		 1655 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1656 udev);
2bf4086d 1657 else {
645daaab
AS		 1658 dev_dbg(&udev->dev, "usb %ssuspend\n",
1659 udev->auto_pm ? "auto-" : "");
2bf4086d
AS		 1660 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1661 }
1da177e4
LT		 1662 return status;
1663}
1664
5edbfb7c 1665/*
140d8f68 1666 * usb_port_suspend - suspend a usb device's upstream port
1da177e4 1667 * @udev: device that's no longer in active use
5edbfb7c 1668 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1669 *
1670 * Suspends a USB device that isn't in active use, conserving power.
1671 * Devices may wake out of a suspend, if anything important happens,
1672 * using the remote wakeup mechanism. They may also be taken out of
140d8f68 1673 * suspend by the host, using usb_port_resume(). It's also routine
1da177e4
LT		 1674 * to disconnect devices while they are suspended.
1675 *
390a8c34
DB		 1676 * This only affects the USB hardware for a device; its interfaces
1677 * (and, for hubs, child devices) must already have been suspended.
1678 *
1da177e4
LT		 1679 * Suspending OTG devices may trigger HNP, if that's been enabled
1680 * between a pair of dual-role devices. That will change roles, such
1681 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1682 *
1683 * Returns 0 on success, else negative errno.
1684 */
140d8f68 1685int usb_port_suspend(struct usb_device *udev)
1da177e4 1686{
140d8f68 1687 return __usb_port_suspend(udev, udev->portnum);
1da177e4 1688}
f3f3253d 1689
1da177e4 1690/*
390a8c34
DB		 1691 * If the USB "suspend" state is in use (rather than "global suspend"),
1692 * many devices will be individually taken out of suspend state using
1693 * special" resume" signaling. These routines kick in shortly after
1da177e4
LT		 1694 * hardware resume signaling is finished, either because of selective
1695 * resume (by host) or remote wakeup (by device) ... now see what changed
1696 * in the tree that's rooted at this device.
1697 */
140d8f68 1698static int finish_port_resume(struct usb_device *udev)
1da177e4
LT		 1699{
1700 int status;
1701 u16 devstatus;
1702
1703 /* caller owns the udev device lock */
f3f3253d 1704 dev_dbg(&udev->dev, "finish resume\n");
1da177e4
LT		 1705
1706 /* usb ch9 identifies four variants of SUSPENDED, based on what
1707 * state the device resumes to. Linux currently won't see the
1708 * first two on the host side; they'd be inside hub_port_init()
1709 * during many timeouts, but khubd can't suspend until later.
1710 */
1711 usb_set_device_state(udev, udev->actconfig
1712 ? USB_STATE_CONFIGURED
1713 : USB_STATE_ADDRESS);
1da177e4
LT		 1714
1715 /* 10.5.4.5 says be sure devices in the tree are still there.
1716 * For now let's assume the device didn't go crazy on resume,
1717 * and device drivers will know about any resume quirks.
1718 */
1719 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
b40b7a90
AS		 1720 if (status >= 0)
1721 status = (status == 2 ? 0 : -ENODEV);
1722
1723 if (status)
1da177e4
LT		 1724 dev_dbg(&udev->dev,
1725 "gone after usb resume? status %d\n",
1726 status);
1727 else if (udev->actconfig) {
1da177e4 1728 le16_to_cpus(&devstatus);
55c52718 1729 if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
f3f3253d 1730 && udev->parent) {
1da177e4
LT		 1731 status = usb_control_msg(udev,
1732 usb_sndctrlpipe(udev, 0),
1733 USB_REQ_CLEAR_FEATURE,
1734 USB_RECIP_DEVICE,
1735 USB_DEVICE_REMOTE_WAKEUP, 0,
1736 NULL, 0,
1737 USB_CTRL_SET_TIMEOUT);
a8e7c565 1738 if (status)
1da177e4
LT		 1739 dev_dbg(&udev->dev, "disable remote "
1740 "wakeup, status %d\n", status);
4bf0ba86 1741 }
1da177e4
LT		 1742 status = 0;
1743
1744 } else if (udev->devnum <= 0) {
1745 dev_dbg(&udev->dev, "bogus resume!\n");
1746 status = -EINVAL;
1747 }
1748 return status;
1749}
1750
1751static int
1752hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1753{
1754 int status;
d25450c6
AS		 1755 u16 portchange, portstatus;
1756
1757 /* Skip the initial Clear-Suspend step for a remote wakeup */
1758 status = hub_port_status(hub, port1, &portstatus, &portchange);
1759 if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
1760 goto SuspendCleared;
1da177e4
LT		 1761
1762 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1763
d5cbad4b
AS		 1764 set_bit(port1, hub->busy_bits);
1765
1da177e4
LT		 1766 /* see 7.1.7.7; affects power usage, but not budgeting */
1767 status = clear_port_feature(hub->hdev,
1768 port1, USB_PORT_FEAT_SUSPEND);
1769 if (status) {
1770 dev_dbg(hub->intfdev,
1771 "can't resume port %d, status %d\n",
1772 port1, status);
1773 } else {
1da177e4
LT		 1774 /* drive resume for at least 20 msec */
1775 if (udev)
645daaab
AS		 1776 dev_dbg(&udev->dev, "usb %sresume\n",
1777 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1778 msleep(25);
1779
1780#define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1781 | USB_PORT_STAT_ENABLE \
1782 | USB_PORT_STAT_CONNECTION)
1783
1784 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1785 * stop resume signaling. Then finish the resume
1786 * sequence.
1787 */
d25450c6
AS		 1788 status = hub_port_status(hub, port1, &portstatus, &portchange);
1789SuspendCleared:
1da177e4 1790 if (status < 0
d25450c6
AS		 1791 || (portstatus & LIVE_FLAGS) != LIVE_FLAGS
1792 || (portstatus & USB_PORT_STAT_SUSPEND) != 0
1da177e4
LT		 1793 ) {
1794 dev_dbg(hub->intfdev,
1795 "port %d status %04x.%04x after resume, %d\n",
d25450c6 1796 port1, portchange, portstatus, status);
20307949
AS		 1797 if (status >= 0)
1798 status = -ENODEV;
1da177e4 1799 } else {
20307949
AS		 1800 if (portchange & USB_PORT_STAT_C_SUSPEND)
1801 clear_port_feature(hub->hdev, port1,
1802 USB_PORT_FEAT_C_SUSPEND);
1da177e4
LT		 1803 /* TRSMRCY = 10 msec */
1804 msleep(10);
1805 if (udev)
140d8f68 1806 status = finish_port_resume(udev);
1da177e4
LT		 1807 }
1808 }
1809 if (status < 0)
1810 hub_port_logical_disconnect(hub, port1);
1811
d5cbad4b
AS		 1812 clear_bit(port1, hub->busy_bits);
1813 if (!hub->hdev->parent && !hub->busy_bits[0])
1814 usb_enable_root_hub_irq(hub->hdev->bus);
1815
1da177e4
LT		 1816 return status;
1817}
1818
5edbfb7c 1819/*
140d8f68 1820 * usb_port_resume - re-activate a suspended usb device's upstream port
1da177e4 1821 * @udev: device to re-activate
5edbfb7c 1822 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1823 *
1824 * This will re-activate the suspended device, increasing power usage
1825 * while letting drivers communicate again with its endpoints.
1826 * USB resume explicitly guarantees that the power session between
1827 * the host and the device is the same as it was when the device
1828 * suspended.
1829 *
1830 * Returns 0 on success, else negative errno.
1831 */
140d8f68 1832int usb_port_resume(struct usb_device *udev)
1da177e4 1833{
d388dab7 1834 int status;
1da177e4 1835
140d8f68
AS		 1836 /* we change the device's upstream USB link,
1837 * but root hubs have no upstream USB link.
1838 */
f3f3253d 1839 if (udev->parent) {
114b368c
AS		 1840 // NOTE this fails if parent is also suspended...
1841 status = hub_port_resume(hdev_to_hub(udev->parent),
1842 udev->portnum, udev);
645daaab
AS		 1843 } else {
1844 dev_dbg(&udev->dev, "usb %sresume\n",
1845 udev->auto_pm ? "auto-" : "");
140d8f68 1846 status = finish_port_resume(udev);
645daaab 1847 }
f3f3253d 1848 if (status < 0)
a8e7c565 1849 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
1da177e4
LT		 1850 return status;
1851}
1852
1853static int remote_wakeup(struct usb_device *udev)
1854{
1855 int status = 0;
1856
9ad3d6cc 1857 usb_lock_device(udev);
1da177e4 1858 if (udev->state == USB_STATE_SUSPENDED) {
645daaab 1859 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
94fcda1f 1860 status = usb_autoresume_device(udev);
d25450c6
AS		 1861
1862 /* Give the interface drivers a chance to do something,
1863 * then autosuspend the device again. */
645daaab 1864 if (status == 0)
94fcda1f 1865 usb_autosuspend_device(udev);
1da177e4 1866 }
9ad3d6cc 1867 usb_unlock_device(udev);
1da177e4
LT		 1868 return status;
1869}
1870
d388dab7
AS		 1871#else /* CONFIG_USB_SUSPEND */
1872
1873/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1874
1875int usb_port_suspend(struct usb_device *udev)
1876{
1877 return 0;
1878}
1879
1880static inline int
1881finish_port_resume(struct usb_device *udev)
1882{
1883 return 0;
1884}
1885
1886static inline int
1887hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1888{
1889 return 0;
1890}
1891
1892int usb_port_resume(struct usb_device *udev)
1893{
1894 return 0;
1895}
1896
1897static inline int remote_wakeup(struct usb_device *udev)
1898{
1899 return 0;
1900}
1901
1902#endif
1903
db690874 1904static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1da177e4
LT		 1905{
1906 struct usb_hub *hub = usb_get_intfdata (intf);
1907 struct usb_device *hdev = hub->hdev;
1908 unsigned port1;
12f1ff83 1909 int status = 0;
1da177e4 1910
c9f89fa4 1911 /* fail if children aren't already suspended */
1da177e4
LT		 1912 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1913 struct usb_device *udev;
1914
1915 udev = hdev->children [port1-1];
114b368c 1916 if (udev && msg.event == PM_EVENT_SUSPEND &&
f3f3253d 1917#ifdef CONFIG_USB_SUSPEND
114b368c
AS		 1918 udev->state != USB_STATE_SUSPENDED
1919#else
1920 udev->dev.power.power_state.event
1921 == PM_EVENT_ON
f3f3253d 1922#endif
114b368c 1923 ) {
645daaab
AS		 1924 if (!hdev->auto_pm)
1925 dev_dbg(&intf->dev, "port %d nyet suspended\n",
1926 port1);
c9f89fa4
DB		 1927 return -EBUSY;
1928 }
1da177e4
LT		 1929 }
1930
40f122f3
AS		 1931 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1932
12f1ff83
AS		 1933 /* stop khubd and related activity */
1934 hub_quiesce(hub);
1935
f3f3253d
DB		 1936 /* "global suspend" of the downstream HC-to-USB interface */
1937 if (!hdev->parent) {
12f1ff83
AS		 1938 status = hcd_bus_suspend(hdev->bus);
1939 if (status != 0) {
1940 dev_dbg(&hdev->dev, "'global' suspend %d\n", status);
1941 hub_activate(hub);
1942 }
f3f3253d 1943 }
12f1ff83 1944 return status;
1da177e4
LT		 1945}
1946
1947static int hub_resume(struct usb_interface *intf)
1948{
1da177e4 1949 struct usb_hub *hub = usb_get_intfdata (intf);
40f122f3 1950 struct usb_device *hdev = hub->hdev;
1da177e4
LT		 1951 int status;
1952
40f122f3
AS		 1953 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1954
f3f3253d
DB		 1955 /* "global resume" of the downstream HC-to-USB interface */
1956 if (!hdev->parent) {
1957 struct usb_bus *bus = hdev->bus;
0c0382e3
AS		 1958 if (bus) {
1959 status = hcd_bus_resume (bus);
f3f3253d
DB		 1960 if (status) {
1961 dev_dbg(&intf->dev, "'global' resume %d\n",
1962 status);
1963 return status;
1964 }
1965 } else
1966 return -EOPNOTSUPP;
1967 if (status == 0) {
1968 /* TRSMRCY = 10 msec */
1969 msleep(10);
1970 }
1971 }
1972
a8e7c565 1973 /* tell khubd to look for changes on this hub */
f3f3253d 1974 hub_activate(hub);
1da177e4
LT		 1975 return 0;
1976}
1977
d388dab7
AS		 1978#else /* CONFIG_PM */
1979
1980static inline int remote_wakeup(struct usb_device *udev)
1981{
1982 return 0;
1983}
1984
511366da
AM		 1985#define hub_suspend NULL
1986#define hub_resume NULL
d388dab7
AS		 1987#endif
1988
1da177e4
LT		 1989void usb_resume_root_hub(struct usb_device *hdev)
1990{
1991 struct usb_hub *hub = hdev_to_hub(hdev);
1992
1da177e4
LT		 1993 kick_khubd(hub);
1994}
1995
1da177e4
LT		 1996
1997/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
1998 *
1999 * Between connect detection and reset signaling there must be a delay
2000 * of 100ms at least for debounce and power-settling. The corresponding
2001 * timer shall restart whenever the downstream port detects a disconnect.
2002 *
2003 * Apparently there are some bluetooth and irda-dongles and a number of
2004 * low-speed devices for which this debounce period may last over a second.
2005 * Not covered by the spec - but easy to deal with.
2006 *
2007 * This implementation uses a 1500ms total debounce timeout; if the
2008 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2009 * every 25ms for transient disconnects. When the port status has been
2010 * unchanged for 100ms it returns the port status.
2011 */
2012
2013#define HUB_DEBOUNCE_TIMEOUT 1500
2014#define HUB_DEBOUNCE_STEP 25
2015#define HUB_DEBOUNCE_STABLE 100
2016
2017static int hub_port_debounce(struct usb_hub *hub, int port1)
2018{
2019 int ret;
2020 int total_time, stable_time = 0;
2021 u16 portchange, portstatus;
2022 unsigned connection = 0xffff;
2023
2024 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2025 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2026 if (ret < 0)
2027 return ret;
2028
2029 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2030 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2031 stable_time += HUB_DEBOUNCE_STEP;
2032 if (stable_time >= HUB_DEBOUNCE_STABLE)
2033 break;
2034 } else {
2035 stable_time = 0;
2036 connection = portstatus & USB_PORT_STAT_CONNECTION;
2037 }
2038
2039 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2040 clear_port_feature(hub->hdev, port1,
2041 USB_PORT_FEAT_C_CONNECTION);
2042 }
2043
2044 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2045 break;
2046 msleep(HUB_DEBOUNCE_STEP);
2047 }
2048
2049 dev_dbg (hub->intfdev,
2050 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2051 port1, total_time, stable_time, portstatus);
2052
2053 if (stable_time < HUB_DEBOUNCE_STABLE)
2054 return -ETIMEDOUT;
2055 return portstatus;
2056}
2057
2058static void ep0_reinit(struct usb_device *udev)
2059{
2060 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2061 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2062 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2063}
2064
2065#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2066#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2067
2068static int hub_set_address(struct usb_device *udev)
2069{
2070 int retval;
2071
2072 if (udev->devnum == 0)
2073 return -EINVAL;
2074 if (udev->state == USB_STATE_ADDRESS)
2075 return 0;
2076 if (udev->state != USB_STATE_DEFAULT)
2077 return -EINVAL;
2078 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2079 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2080 NULL, 0, USB_CTRL_SET_TIMEOUT);
2081 if (retval == 0) {
2082 usb_set_device_state(udev, USB_STATE_ADDRESS);
2083 ep0_reinit(udev);
2084 }
2085 return retval;
2086}
2087
2088/* Reset device, (re)assign address, get device descriptor.
2089 * Device connection must be stable, no more debouncing needed.
2090 * Returns device in USB_STATE_ADDRESS, except on error.
2091 *
2092 * If this is called for an already-existing device (as part of
2093 * usb_reset_device), the caller must own the device lock. For a
2094 * newly detected device that is not accessible through any global
2095 * pointers, it's not necessary to lock the device.
2096 */
2097static int
2098hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2099 int retry_counter)
2100{
4186ecf8 2101 static DEFINE_MUTEX(usb_address0_mutex);
1da177e4
LT		 2102
2103 struct usb_device *hdev = hub->hdev;
2104 int i, j, retval;
2105 unsigned delay = HUB_SHORT_RESET_TIME;
2106 enum usb_device_speed oldspeed = udev->speed;
83a07196 2107 char *speed, *type;
1da177e4
LT		 2108
2109 /* root hub ports have a slightly longer reset period
2110 * (from USB 2.0 spec, section 7.1.7.5)
2111 */
2112 if (!hdev->parent) {
2113 delay = HUB_ROOT_RESET_TIME;
2114 if (port1 == hdev->bus->otg_port)
2115 hdev->bus->b_hnp_enable = 0;
2116 }
2117
2118 /* Some low speed devices have problems with the quick delay, so */
2119 /* be a bit pessimistic with those devices. RHbug #23670 */
2120 if (oldspeed == USB_SPEED_LOW)
2121 delay = HUB_LONG_RESET_TIME;
2122
4186ecf8 2123 mutex_lock(&usb_address0_mutex);
1da177e4
LT		 2124
2125 /* Reset the device; full speed may morph to high speed */
2126 retval = hub_port_reset(hub, port1, udev, delay);
2127 if (retval < 0) /* error or disconnect */
2128 goto fail;
2129 /* success, speed is known */
2130 retval = -ENODEV;
2131
2132 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2133 dev_dbg(&udev->dev, "device reset changed speed!\n");
2134 goto fail;
2135 }
2136 oldspeed = udev->speed;
2137
2138 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2139 * it's fixed size except for full speed devices.
5bb6e0ae
IPG		 2140 * For Wireless USB devices, ep0 max packet is always 512 (tho
2141 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
1da177e4
LT		 2142 */
2143 switch (udev->speed) {
5bb6e0ae
IPG		 2144 case USB_SPEED_VARIABLE: /* fixed at 512 */
2145 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
2146 break;
1da177e4
LT		 2147 case USB_SPEED_HIGH: /* fixed at 64 */
2148 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2149 break;
2150 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2151 /* to determine the ep0 maxpacket size, try to read
2152 * the device descriptor to get bMaxPacketSize0 and
2153 * then correct our initial guess.
2154 */
2155 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2156 break;
2157 case USB_SPEED_LOW: /* fixed at 8 */
2158 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2159 break;
2160 default:
2161 goto fail;
2162 }
2163
83a07196
IPG		 2164 type = "";
2165 switch (udev->speed) {
2166 case USB_SPEED_LOW: speed = "low"; break;
2167 case USB_SPEED_FULL: speed = "full"; break;
2168 case USB_SPEED_HIGH: speed = "high"; break;
2169 case USB_SPEED_VARIABLE:
2170 speed = "variable";
2171 type = "Wireless ";
2172 break;
2173 default: speed = "?"; break;
2174 }
1da177e4 2175 dev_info (&udev->dev,
83a07196
IPG		 2176 "%s %s speed %sUSB device using %s and address %d\n",
2177 (udev->config) ? "reset" : "new", speed, type,
2178 udev->bus->controller->driver->name, udev->devnum);
1da177e4
LT		 2179
2180 /* Set up TT records, if needed */
2181 if (hdev->tt) {
2182 udev->tt = hdev->tt;
2183 udev->ttport = hdev->ttport;
2184 } else if (udev->speed != USB_SPEED_HIGH
2185 && hdev->speed == USB_SPEED_HIGH) {
2186 udev->tt = &hub->tt;
2187 udev->ttport = port1;
2188 }
2189
2190 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2191 * Because device hardware and firmware is sometimes buggy in
2192 * this area, and this is how Linux has done it for ages.
2193 * Change it cautiously.
2194 *
2195 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2196 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2197 * so it may help with some non-standards-compliant devices.
2198 * Otherwise we start with SET_ADDRESS and then try to read the
2199 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2200 * value.
2201 */
2202 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2203 if (USE_NEW_SCHEME(retry_counter)) {
2204 struct usb_device_descriptor *buf;
2205 int r = 0;
2206
2207#define GET_DESCRIPTOR_BUFSIZE 64
2208 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2209 if (!buf) {
2210 retval = -ENOMEM;
2211 continue;
2212 }
2213
2214 /* Use a short timeout the first time through,
2215 * so that recalcitrant full-speed devices with
2216 * 8- or 16-byte ep0-maxpackets won't slow things
2217 * down tremendously by NAKing the unexpectedly
2218 * early status stage. Also, retry on all errors;
2219 * some devices are flakey.
5bb6e0ae
IPG		 2220 * 255 is for WUSB devices, we actually need to use 512.
2221 * WUSB1.0[4.8.1].
1da177e4
LT		 2222 */
2223 for (j = 0; j < 3; ++j) {
2224 buf->bMaxPacketSize0 = 0;
2225 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2226 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2227 USB_DT_DEVICE << 8, 0,
2228 buf, GET_DESCRIPTOR_BUFSIZE,
2229 (i ? USB_CTRL_GET_TIMEOUT : 1000));
2230 switch (buf->bMaxPacketSize0) {
5bb6e0ae 2231 case 8: case 16: case 32: case 64: case 255:
1da177e4
LT		 2232 if (buf->bDescriptorType ==
2233 USB_DT_DEVICE) {
2234 r = 0;
2235 break;
2236 }
2237 /* FALL THROUGH */
2238 default:
2239 if (r == 0)
2240 r = -EPROTO;
2241 break;
2242 }
2243 if (r == 0)
2244 break;
2245 }
2246 udev->descriptor.bMaxPacketSize0 =
2247 buf->bMaxPacketSize0;
2248 kfree(buf);
2249
2250 retval = hub_port_reset(hub, port1, udev, delay);
2251 if (retval < 0) /* error or disconnect */
2252 goto fail;
2253 if (oldspeed != udev->speed) {
2254 dev_dbg(&udev->dev,
2255 "device reset changed speed!\n");
2256 retval = -ENODEV;
2257 goto fail;
2258 }
2259 if (r) {
2260 dev_err(&udev->dev, "device descriptor "
2261 "read/%s, error %d\n",
2262 "64", r);
2263 retval = -EMSGSIZE;
2264 continue;
2265 }
2266#undef GET_DESCRIPTOR_BUFSIZE
2267 }
2268
2269 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2270 retval = hub_set_address(udev);
2271 if (retval >= 0)
2272 break;
2273 msleep(200);
2274 }
2275 if (retval < 0) {
2276 dev_err(&udev->dev,
2277 "device not accepting address %d, error %d\n",
2278 udev->devnum, retval);
2279 goto fail;
2280 }
2281
2282 /* cope with hardware quirkiness:
2283 * - let SET_ADDRESS settle, some device hardware wants it
2284 * - read ep0 maxpacket even for high and low speed,
2285 */
2286 msleep(10);
2287 if (USE_NEW_SCHEME(retry_counter))
2288 break;
2289
2290 retval = usb_get_device_descriptor(udev, 8);
2291 if (retval < 8) {
2292 dev_err(&udev->dev, "device descriptor "
2293 "read/%s, error %d\n",
2294 "8", retval);
2295 if (retval >= 0)
2296 retval = -EMSGSIZE;
2297 } else {
2298 retval = 0;
2299 break;
2300 }
2301 }
2302 if (retval)
2303 goto fail;
2304
5bb6e0ae
IPG		 2305 i = udev->descriptor.bMaxPacketSize0 == 0xff?
2306 512 : udev->descriptor.bMaxPacketSize0;
1da177e4
LT		 2307 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2308 if (udev->speed != USB_SPEED_FULL ||
2309 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2310 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2311 retval = -EMSGSIZE;
2312 goto fail;
2313 }
2314 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2315 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2316 ep0_reinit(udev);
2317 }
2318
2319 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2320 if (retval < (signed)sizeof(udev->descriptor)) {
2321 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2322 "all", retval);
2323 if (retval >= 0)
2324 retval = -ENOMSG;
2325 goto fail;
2326 }
2327
2328 retval = 0;
2329
2330fail:
2331 if (retval)
2332 hub_port_disable(hub, port1, 0);
4186ecf8 2333 mutex_unlock(&usb_address0_mutex);
1da177e4
LT		 2334 return retval;
2335}
2336
2337static void
2338check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2339{
2340 struct usb_qualifier_descriptor *qual;
2341 int status;
2342
e94b1766 2343 qual = kmalloc (sizeof *qual, GFP_KERNEL);
1da177e4
LT		 2344 if (qual == NULL)
2345 return;
2346
2347 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2348 qual, sizeof *qual);
2349 if (status == sizeof *qual) {
2350 dev_info(&udev->dev, "not running at top speed; "
2351 "connect to a high speed hub\n");
2352 /* hub LEDs are probably harder to miss than syslog */
2353 if (hub->has_indicators) {
2354 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
c4028958 2355 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2356 }
2357 }
1bc3c9e1 2358 kfree(qual);
1da177e4
LT		 2359}
2360
2361static unsigned
2362hub_power_remaining (struct usb_hub *hub)
2363{
2364 struct usb_device *hdev = hub->hdev;
2365 int remaining;
55c52718 2366 int port1;
1da177e4 2367
55c52718 2368 if (!hub->limited_power)
1da177e4
LT		 2369 return 0;
2370
55c52718
AS		 2371 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2372 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2373 struct usb_device *udev = hdev->children[port1 - 1];
2374 int delta;
1da177e4
LT		 2375
2376 if (!udev)
2377 continue;
2378
55c52718
AS		 2379 /* Unconfigured devices may not use more than 100mA,
2380 * or 8mA for OTG ports */
1da177e4 2381 if (udev->actconfig)
55c52718
AS		 2382 delta = udev->actconfig->desc.bMaxPower * 2;
2383 else if (port1 != udev->bus->otg_port || hdev->parent)
2384 delta = 100;
1da177e4 2385 else
55c52718
AS		 2386 delta = 8;
2387 if (delta > hub->mA_per_port)
2388 dev_warn(&udev->dev, "%dmA is over %umA budget "
2389 "for port %d!\n",
2390 delta, hub->mA_per_port, port1);
1da177e4
LT		 2391 remaining -= delta;
2392 }
2393 if (remaining < 0) {
55c52718
AS		 2394 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2395 - remaining);
1da177e4
LT		 2396 remaining = 0;
2397 }
2398 return remaining;
2399}
2400
2401/* Handle physical or logical connection change events.
2402 * This routine is called when:
2403 * a port connection-change occurs;
2404 * a port enable-change occurs (often caused by EMI);
2405 * usb_reset_device() encounters changed descriptors (as from
2406 * a firmware download)
2407 * caller already locked the hub
2408 */
2409static void hub_port_connect_change(struct usb_hub *hub, int port1,
2410 u16 portstatus, u16 portchange)
2411{
2412 struct usb_device *hdev = hub->hdev;
2413 struct device *hub_dev = hub->intfdev;
74ad9bd2 2414 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4
LT		 2415 int status, i;
2416
2417 dev_dbg (hub_dev,
2418 "port %d, status %04x, change %04x, %s\n",
2419 port1, portstatus, portchange, portspeed (portstatus));
2420
2421 if (hub->has_indicators) {
2422 set_port_led(hub, port1, HUB_LED_AUTO);
2423 hub->indicator[port1-1] = INDICATOR_AUTO;
2424 }
2425
2426 /* Disconnect any existing devices under this port */
2427 if (hdev->children[port1-1])
2428 usb_disconnect(&hdev->children[port1-1]);
2429 clear_bit(port1, hub->change_bits);
2430
2431#ifdef CONFIG_USB_OTG
2432 /* during HNP, don't repeat the debounce */
2433 if (hdev->bus->is_b_host)
2434 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2435#endif
2436
2437 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2438 status = hub_port_debounce(hub, port1);
7bc4b81d 2439 if (status < 0 && printk_ratelimit()) {
1da177e4
LT		 2440 dev_err (hub_dev,
2441 "connect-debounce failed, port %d disabled\n",
2442 port1);
2443 goto done;
2444 }
2445 portstatus = status;
2446 }
2447
2448 /* Return now if nothing is connected */
2449 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2450
2451 /* maybe switch power back on (e.g. root hub was reset) */
74ad9bd2 2452 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
1da177e4
LT		 2453 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2454 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2455
2456 if (portstatus & USB_PORT_STAT_ENABLE)
2457 goto done;
2458 return;
2459 }
2460
2461#ifdef CONFIG_USB_SUSPEND
2462 /* If something is connected, but the port is suspended, wake it up. */
2463 if (portstatus & USB_PORT_STAT_SUSPEND) {
2464 status = hub_port_resume(hub, port1, NULL);
2465 if (status < 0) {
2466 dev_dbg(hub_dev,
2467 "can't clear suspend on port %d; %d\n",
2468 port1, status);
2469 goto done;
2470 }
2471 }
2472#endif
2473
2474 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2475 struct usb_device *udev;
2476
2477 /* reallocate for each attempt, since references
2478 * to the previous one can escape in various ways
2479 */
2480 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2481 if (!udev) {
2482 dev_err (hub_dev,
2483 "couldn't allocate port %d usb_device\n",
2484 port1);
2485 goto done;
2486 }
2487
2488 usb_set_device_state(udev, USB_STATE_POWERED);
2489 udev->speed = USB_SPEED_UNKNOWN;
55c52718 2490 udev->bus_mA = hub->mA_per_port;
b6956ffa 2491 udev->level = hdev->level + 1;
55c52718 2492
1da177e4
LT		 2493 /* set the address */
2494 choose_address(udev);
2495 if (udev->devnum <= 0) {
2496 status = -ENOTCONN; /* Don't retry */
2497 goto loop;
2498 }
2499
2500 /* reset and get descriptor */
2501 status = hub_port_init(hub, udev, port1, i);
2502 if (status < 0)
2503 goto loop;
2504
2505 /* consecutive bus-powered hubs aren't reliable; they can
2506 * violate the voltage drop budget. if the new child has
2507 * a "powered" LED, users should notice we didn't enable it
2508 * (without reading syslog), even without per-port LEDs
2509 * on the parent.
2510 */
2511 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
55c52718 2512 && udev->bus_mA <= 100) {
1da177e4
LT		 2513 u16 devstat;
2514
2515 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2516 &devstat);
55c52718 2517 if (status < 2) {
1da177e4
LT		 2518 dev_dbg(&udev->dev, "get status %d ?\n", status);
2519 goto loop_disable;
2520 }
55c52718 2521 le16_to_cpus(&devstat);
1da177e4
LT		 2522 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2523 dev_err(&udev->dev,
2524 "can't connect bus-powered hub "
2525 "to this port\n");
2526 if (hub->has_indicators) {
2527 hub->indicator[port1-1] =
2528 INDICATOR_AMBER_BLINK;
c4028958 2529 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2530 }
2531 status = -ENOTCONN; /* Don't retry */
2532 goto loop_disable;
2533 }
2534 }
2535
2536 /* check for devices running slower than they could */
2537 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2538 && udev->speed == USB_SPEED_FULL
2539 && highspeed_hubs != 0)
2540 check_highspeed (hub, udev, port1);
2541
2542 /* Store the parent's children[] pointer. At this point
2543 * udev becomes globally accessible, although presumably
2544 * no one will look at it until hdev is unlocked.
2545 */
1da177e4
LT		 2546 status = 0;
2547
2548 /* We mustn't add new devices if the parent hub has
2549 * been disconnected; we would race with the
2550 * recursively_mark_NOTATTACHED() routine.
2551 */
2552 spin_lock_irq(&device_state_lock);
2553 if (hdev->state == USB_STATE_NOTATTACHED)
2554 status = -ENOTCONN;
2555 else
2556 hdev->children[port1-1] = udev;
2557 spin_unlock_irq(&device_state_lock);
2558
2559 /* Run it through the hoops (find a driver, etc) */
2560 if (!status) {
2561 status = usb_new_device(udev);
2562 if (status) {
2563 spin_lock_irq(&device_state_lock);
2564 hdev->children[port1-1] = NULL;
2565 spin_unlock_irq(&device_state_lock);
2566 }
2567 }
2568
1da177e4
LT		 2569 if (status)
2570 goto loop_disable;
2571
2572 status = hub_power_remaining(hub);
2573 if (status)
55c52718 2574 dev_dbg(hub_dev, "%dmA power budget left\n", status);
1da177e4
LT		 2575
2576 return;
2577
2578loop_disable:
2579 hub_port_disable(hub, port1, 1);
2580loop:
2581 ep0_reinit(udev);
2582 release_address(udev);
2583 usb_put_dev(udev);
2584 if (status == -ENOTCONN)
2585 break;
2586 }
2587
2588done:
2589 hub_port_disable(hub, port1, 1);
2590}
2591
2592static void hub_events(void)
2593{
2594 struct list_head *tmp;
2595 struct usb_device *hdev;
2596 struct usb_interface *intf;
2597 struct usb_hub *hub;
2598 struct device *hub_dev;
2599 u16 hubstatus;
2600 u16 hubchange;
2601 u16 portstatus;
2602 u16 portchange;
2603 int i, ret;
2604 int connect_change;
2605
2606 /*
2607 * We restart the list every time to avoid a deadlock with
2608 * deleting hubs downstream from this one. This should be
2609 * safe since we delete the hub from the event list.
2610 * Not the most efficient, but avoids deadlocks.
2611 */
2612 while (1) {
2613
2614 /* Grab the first entry at the beginning of the list */
2615 spin_lock_irq(&hub_event_lock);
2616 if (list_empty(&hub_event_list)) {
2617 spin_unlock_irq(&hub_event_lock);
2618 break;
2619 }
2620
2621 tmp = hub_event_list.next;
2622 list_del_init(tmp);
2623
2624 hub = list_entry(tmp, struct usb_hub, event_list);
2625 hdev = hub->hdev;
2626 intf = to_usb_interface(hub->intfdev);
2627 hub_dev = &intf->dev;
2628
40f122f3 2629 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
1da177e4
LT		 2630 hdev->state, hub->descriptor
2631 ? hub->descriptor->bNbrPorts
2632 : 0,
2633 /* NOTE: expects max 15 ports... */
2634 (u16) hub->change_bits[0],
40f122f3 2635 (u16) hub->event_bits[0]);
1da177e4
LT		 2636
2637 usb_get_intf(intf);
1da177e4
LT		 2638 spin_unlock_irq(&hub_event_lock);
2639
1da177e4
LT		 2640 /* Lock the device, then check to see if we were
2641 * disconnected while waiting for the lock to succeed. */
2642 if (locktree(hdev) < 0) {
2643 usb_put_intf(intf);
2644 continue;
2645 }
2646 if (hub != usb_get_intfdata(intf))
2647 goto loop;
2648
2649 /* If the hub has died, clean up after it */
2650 if (hdev->state == USB_STATE_NOTATTACHED) {
7de18d8b
AS		 2651 hub->error = -ENODEV;
2652 hub_pre_reset(intf);
1da177e4
LT		 2653 goto loop;
2654 }
2655
40f122f3
AS		 2656 /* Autoresume */
2657 ret = usb_autopm_get_interface(intf);
2658 if (ret) {
2659 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
2660 goto loop;
2661 }
a8e7c565 2662
40f122f3 2663 /* If this is an inactive hub, do nothing */
1da177e4 2664 if (hub->quiescing)
40f122f3 2665 goto loop_autopm;
1da177e4
LT		 2666
2667 if (hub->error) {
2668 dev_dbg (hub_dev, "resetting for error %d\n",
2669 hub->error);
2670
7de18d8b 2671 ret = usb_reset_composite_device(hdev, intf);
1da177e4
LT		 2672 if (ret) {
2673 dev_dbg (hub_dev,
2674 "error resetting hub: %d\n", ret);
40f122f3 2675 goto loop_autopm;
1da177e4
LT		 2676 }
2677
2678 hub->nerrors = 0;
2679 hub->error = 0;
2680 }
2681
2682 /* deal with port status changes */
2683 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2684 if (test_bit(i, hub->busy_bits))
2685 continue;
2686 connect_change = test_bit(i, hub->change_bits);
2687 if (!test_and_clear_bit(i, hub->event_bits) &&
2688 !connect_change && !hub->activating)
2689 continue;
2690
2691 ret = hub_port_status(hub, i,
2692 &portstatus, &portchange);
2693 if (ret < 0)
2694 continue;
2695
2696 if (hub->activating && !hdev->children[i-1] &&
2697 (portstatus &
2698 USB_PORT_STAT_CONNECTION))
2699 connect_change = 1;
2700
2701 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2702 clear_port_feature(hdev, i,
2703 USB_PORT_FEAT_C_CONNECTION);
2704 connect_change = 1;
2705 }
2706
2707 if (portchange & USB_PORT_STAT_C_ENABLE) {
2708 if (!connect_change)
2709 dev_dbg (hub_dev,
2710 "port %d enable change, "
2711 "status %08x\n",
2712 i, portstatus);
2713 clear_port_feature(hdev, i,
2714 USB_PORT_FEAT_C_ENABLE);
2715
2716 /*
2717 * EM interference sometimes causes badly
2718 * shielded USB devices to be shutdown by
2719 * the hub, this hack enables them again.
2720 * Works at least with mouse driver.
2721 */
2722 if (!(portstatus & USB_PORT_STAT_ENABLE)
2723 && !connect_change
2724 && hdev->children[i-1]) {
2725 dev_err (hub_dev,
2726 "port %i "
2727 "disabled by hub (EMI?), "
2728 "re-enabling...\n",
2729 i);
2730 connect_change = 1;
2731 }
2732 }
2733
2734 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2735 clear_port_feature(hdev, i,
2736 USB_PORT_FEAT_C_SUSPEND);
2737 if (hdev->children[i-1]) {
2738 ret = remote_wakeup(hdev->
2739 children[i-1]);
2740 if (ret < 0)
2741 connect_change = 1;
2742 } else {
2743 ret = -ENODEV;
2744 hub_port_disable(hub, i, 1);
2745 }
2746 dev_dbg (hub_dev,
2747 "resume on port %d, status %d\n",
2748 i, ret);
2749 }
2750
2751 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2752 dev_err (hub_dev,
2753 "over-current change on port %d\n",
2754 i);
2755 clear_port_feature(hdev, i,
2756 USB_PORT_FEAT_C_OVER_CURRENT);
2757 hub_power_on(hub);
2758 }
2759
2760 if (portchange & USB_PORT_STAT_C_RESET) {
2761 dev_dbg (hub_dev,
2762 "reset change on port %d\n",
2763 i);
2764 clear_port_feature(hdev, i,
2765 USB_PORT_FEAT_C_RESET);
2766 }
2767
2768 if (connect_change)
2769 hub_port_connect_change(hub, i,
2770 portstatus, portchange);
2771 } /* end for i */
2772
2773 /* deal with hub status changes */
2774 if (test_and_clear_bit(0, hub->event_bits) == 0)
2775 ; /* do nothing */
2776 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2777 dev_err (hub_dev, "get_hub_status failed\n");
2778 else {
2779 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2780 dev_dbg (hub_dev, "power change\n");
2781 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
55c52718
AS		 2782 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2783 /* FIXME: Is this always true? */
2784 hub->limited_power = 0;
2785 else
2786 hub->limited_power = 1;
1da177e4
LT		 2787 }
2788 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2789 dev_dbg (hub_dev, "overcurrent change\n");
2790 msleep(500); /* Cool down */
2791 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2792 hub_power_on(hub);
2793 }
2794 }
2795
2796 hub->activating = 0;
2797
d5926ae7
AS		 2798 /* If this is a root hub, tell the HCD it's okay to
2799 * re-enable port-change interrupts now. */
d5cbad4b 2800 if (!hdev->parent && !hub->busy_bits[0])
d5926ae7
AS		 2801 usb_enable_root_hub_irq(hdev->bus);
2802
40f122f3
AS		 2803loop_autopm:
2804 /* Allow autosuspend if we're not going to run again */
2805 if (list_empty(&hub->event_list))
2806 usb_autopm_enable(intf);
1da177e4
LT		 2807loop:
2808 usb_unlock_device(hdev);
2809 usb_put_intf(intf);
2810
2811 } /* end while (1) */
2812}
2813
2814static int hub_thread(void *__unused)
2815{
1da177e4
LT		 2816 do {
2817 hub_events();
9c8d6178 2818 wait_event_interruptible(khubd_wait,
2819 !list_empty(&hub_event_list) ||
2820 kthread_should_stop());
3e1d1d28 2821 try_to_freeze();
9c8d6178 2822 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
1da177e4 2823
9c8d6178 2824 pr_debug("%s: khubd exiting\n", usbcore_name);
2825 return 0;
1da177e4
LT		 2826}
2827
2828static struct usb_device_id hub_id_table [] = {
2829 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2830 .bDeviceClass = USB_CLASS_HUB},
2831 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2832 .bInterfaceClass = USB_CLASS_HUB},
2833 { } /* Terminating entry */
2834};
2835
2836MODULE_DEVICE_TABLE (usb, hub_id_table);
2837
2838static struct usb_driver hub_driver = {
1da177e4
LT		 2839 .name = "hub",
2840 .probe = hub_probe,
2841 .disconnect = hub_disconnect,
2842 .suspend = hub_suspend,
2843 .resume = hub_resume,
7de18d8b
AS		 2844 .pre_reset = hub_pre_reset,
2845 .post_reset = hub_post_reset,
1da177e4
LT		 2846 .ioctl = hub_ioctl,
2847 .id_table = hub_id_table,
40f122f3 2848 .supports_autosuspend = 1,
1da177e4
LT		 2849};
2850
2851int usb_hub_init(void)
2852{
1da177e4
LT		 2853 if (usb_register(&hub_driver) < 0) {
2854 printk(KERN_ERR "%s: can't register hub driver\n",
2855 usbcore_name);
2856 return -1;
2857 }
2858
9c8d6178 2859 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2860 if (!IS_ERR(khubd_task))
1da177e4 2861 return 0;
1da177e4
LT		 2862
2863 /* Fall through if kernel_thread failed */
2864 usb_deregister(&hub_driver);
2865 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2866
2867 return -1;
2868}
2869
2870void usb_hub_cleanup(void)
2871{
9c8d6178 2872 kthread_stop(khubd_task);
1da177e4
LT		 2873
2874 /*
2875 * Hub resources are freed for us by usb_deregister. It calls
2876 * usb_driver_purge on every device which in turn calls that
2877 * devices disconnect function if it is using this driver.
2878 * The hub_disconnect function takes care of releasing the
2879 * individual hub resources. -greg
2880 */
2881 usb_deregister(&hub_driver);
2882} /* usb_hub_cleanup() */
2883
1da177e4
LT		 2884static int config_descriptors_changed(struct usb_device *udev)
2885{
2886 unsigned index;
2887 unsigned len = 0;
2888 struct usb_config_descriptor *buf;
2889
2890 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2891 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2892 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2893 }
e94b1766 2894 buf = kmalloc (len, GFP_KERNEL);
1da177e4
LT		 2895 if (buf == NULL) {
2896 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2897 /* assume the worst */
2898 return 1;
2899 }
2900 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2901 int length;
2902 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2903
2904 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2905 old_length);
2906 if (length < old_length) {
2907 dev_dbg(&udev->dev, "config index %d, error %d\n",
2908 index, length);
2909 break;
2910 }
2911 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2912 != 0) {
2913 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2914 index, buf->bConfigurationValue);
2915 break;
2916 }
2917 }
2918 kfree(buf);
2919 return index != udev->descriptor.bNumConfigurations;
2920}
2921
2922/**
2923 * usb_reset_device - perform a USB port reset to reinitialize a device
2924 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2925 *
79efa097
AS		 2926 * WARNING - don't use this routine to reset a composite device
2927 * (one with multiple interfaces owned by separate drivers)!
2928 * Use usb_reset_composite_device() instead.
1da177e4
LT		 2929 *
2930 * Do a port reset, reassign the device's address, and establish its
2931 * former operating configuration. If the reset fails, or the device's
2932 * descriptors change from their values before the reset, or the original
2933 * configuration and altsettings cannot be restored, a flag will be set
2934 * telling khubd to pretend the device has been disconnected and then
2935 * re-connected. All drivers will be unbound, and the device will be
2936 * re-enumerated and probed all over again.
2937 *
2938 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2939 * flagged for logical disconnection, or some other negative error code
2940 * if the reset wasn't even attempted.
2941 *
2942 * The caller must own the device lock. For example, it's safe to use
2943 * this from a driver probe() routine after downloading new firmware.
2944 * For calls that might not occur during probe(), drivers should lock
2945 * the device using usb_lock_device_for_reset().
2946 */
2947int usb_reset_device(struct usb_device *udev)
2948{
2949 struct usb_device *parent_hdev = udev->parent;
2950 struct usb_hub *parent_hub;
2951 struct usb_device_descriptor descriptor = udev->descriptor;
12c3da34
AS		 2952 int i, ret = 0;
2953 int port1 = udev->portnum;
1da177e4
LT		 2954
2955 if (udev->state == USB_STATE_NOTATTACHED ||
2956 udev->state == USB_STATE_SUSPENDED) {
2957 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2958 udev->state);
2959 return -EINVAL;
2960 }
2961
2962 if (!parent_hdev) {
2963 /* this requires hcd-specific logic; see OHCI hc_restart() */
2964 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2965 return -EISDIR;
2966 }
1da177e4
LT		 2967 parent_hub = hdev_to_hub(parent_hdev);
2968
1da177e4
LT		 2969 set_bit(port1, parent_hub->busy_bits);
2970 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2971
2972 /* ep0 maxpacket size may change; let the HCD know about it.
2973 * Other endpoints will be handled by re-enumeration. */
2974 ep0_reinit(udev);
2975 ret = hub_port_init(parent_hub, udev, port1, i);
2976 if (ret >= 0)
2977 break;
2978 }
2979 clear_bit(port1, parent_hub->busy_bits);
d5cbad4b
AS		 2980 if (!parent_hdev->parent && !parent_hub->busy_bits[0])
2981 usb_enable_root_hub_irq(parent_hdev->bus);
2982
1da177e4
LT		 2983 if (ret < 0)
2984 goto re_enumerate;
2985
2986 /* Device might have changed firmware (DFU or similar) */
2987 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
2988 || config_descriptors_changed (udev)) {
2989 dev_info(&udev->dev, "device firmware changed\n");
2990 udev->descriptor = descriptor; /* for disconnect() calls */
2991 goto re_enumerate;
2992 }
2993
2994 if (!udev->actconfig)
2995 goto done;
2996
2997 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2998 USB_REQ_SET_CONFIGURATION, 0,
2999 udev->actconfig->desc.bConfigurationValue, 0,
3000 NULL, 0, USB_CTRL_SET_TIMEOUT);
3001 if (ret < 0) {
3002 dev_err(&udev->dev,
3003 "can't restore configuration #%d (error=%d)\n",
3004 udev->actconfig->desc.bConfigurationValue, ret);
3005 goto re_enumerate;
3006 }
3007 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3008
3009 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3010 struct usb_interface *intf = udev->actconfig->interface[i];
3011 struct usb_interface_descriptor *desc;
3012
3013 /* set_interface resets host side toggle even
3014 * for altsetting zero. the interface may have no driver.
3015 */
3016 desc = &intf->cur_altsetting->desc;
3017 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3018 desc->bAlternateSetting);
3019 if (ret < 0) {
3020 dev_err(&udev->dev, "failed to restore interface %d "
3021 "altsetting %d (error=%d)\n",
3022 desc->bInterfaceNumber,
3023 desc->bAlternateSetting,
3024 ret);
3025 goto re_enumerate;
3026 }
3027 }
3028
3029done:
1da177e4
LT		 3030 return 0;
3031
3032re_enumerate:
3033 hub_port_logical_disconnect(parent_hub, port1);
3034 return -ENODEV;
3035}
140d8f68 3036EXPORT_SYMBOL(usb_reset_device);
79efa097
AS		 3037
3038/**
3039 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3040 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3041 * @iface: interface bound to the driver making the request (optional)
3042 *
3043 * Warns all drivers bound to registered interfaces (using their pre_reset
3044 * method), performs the port reset, and then lets the drivers know that
3045 * the reset is over (using their post_reset method).
3046 *
3047 * Return value is the same as for usb_reset_device().
3048 *
3049 * The caller must own the device lock. For example, it's safe to use
3050 * this from a driver probe() routine after downloading new firmware.
3051 * For calls that might not occur during probe(), drivers should lock
3052 * the device using usb_lock_device_for_reset().
3053 *
3054 * The interface locks are acquired during the pre_reset stage and released
3055 * during the post_reset stage. However if iface is not NULL and is
3056 * currently being probed, we assume that the caller already owns its
3057 * lock.
3058 */
3059int usb_reset_composite_device(struct usb_device *udev,
3060 struct usb_interface *iface)
3061{
3062 int ret;
3063 struct usb_host_config *config = udev->actconfig;
3064
3065 if (udev->state == USB_STATE_NOTATTACHED ||
3066 udev->state == USB_STATE_SUSPENDED) {
3067 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3068 udev->state);
3069 return -EINVAL;
3070 }
3071
645daaab 3072 /* Prevent autosuspend during the reset */
94fcda1f 3073 usb_autoresume_device(udev);
645daaab 3074
79efa097
AS		 3075 if (iface && iface->condition != USB_INTERFACE_BINDING)
3076 iface = NULL;
3077
3078 if (config) {
3079 int i;
3080 struct usb_interface *cintf;
3081 struct usb_driver *drv;
3082
3083 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3084 cintf = config->interface[i];
3085 if (cintf != iface)
3086 down(&cintf->dev.sem);
3087 if (device_is_registered(&cintf->dev) &&
3088 cintf->dev.driver) {
3089 drv = to_usb_driver(cintf->dev.driver);
3090 if (drv->pre_reset)
3091 (drv->pre_reset)(cintf);
3092 }
3093 }
3094 }
3095
3096 ret = usb_reset_device(udev);
3097
3098 if (config) {
3099 int i;
3100 struct usb_interface *cintf;
3101 struct usb_driver *drv;
3102
3103 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3104 cintf = config->interface[i];
3105 if (device_is_registered(&cintf->dev) &&
3106 cintf->dev.driver) {
3107 drv = to_usb_driver(cintf->dev.driver);
3108 if (drv->post_reset)
3109 (drv->post_reset)(cintf);
3110 }
3111 if (cintf != iface)
3112 up(&cintf->dev.sem);
3113 }
3114 }
3115
94fcda1f 3116 usb_autosuspend_device(udev);
79efa097
AS		 3117 return ret;
3118}
140d8f68 3119EXPORT_SYMBOL(usb_reset_composite_device);
Linux kernel - Deliverables
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