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USB: Implement PM FREEZE and PRETHAW
[net-next-2.6.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>
1da177e4
LT		 19#include <linux/ioctl.h>
20#include <linux/usb.h>
21#include <linux/usbdevice_fs.h>
9c8d6178 22#include <linux/kthread.h>
4186ecf8 23#include <linux/mutex.h>
7dfb7103 24#include <linux/freezer.h>
1da177e4
LT		 25
26#include <asm/semaphore.h>
27#include <asm/uaccess.h>
28#include <asm/byteorder.h>
29
30#include "usb.h"
31#include "hcd.h"
32#include "hub.h"
33
1bb5f66b
AS		 34struct usb_hub {
35 struct device *intfdev; /* the "interface" device */
36 struct usb_device *hdev;
37 struct urb *urb; /* for interrupt polling pipe */
38
39 /* buffer for urb ... with extra space in case of babble */
40 char (*buffer)[8];
41 dma_addr_t buffer_dma; /* DMA address for buffer */
42 union {
43 struct usb_hub_status hub;
44 struct usb_port_status port;
45 } *status; /* buffer for status reports */
db90e7a1 46 struct mutex status_mutex; /* for the status buffer */
1bb5f66b
AS		 47
48 int error; /* last reported error */
49 int nerrors; /* track consecutive errors */
50
51 struct list_head event_list; /* hubs w/data or errs ready */
52 unsigned long event_bits[1]; /* status change bitmask */
53 unsigned long change_bits[1]; /* ports with logical connect
54 status change */
55 unsigned long busy_bits[1]; /* ports being reset or
56 resumed */
57#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
58#error event_bits[] is too short!
59#endif
60
61 struct usb_hub_descriptor *descriptor; /* class descriptor */
62 struct usb_tt tt; /* Transaction Translator */
63
64 unsigned mA_per_port; /* current for each child */
65
66 unsigned limited_power:1;
67 unsigned quiescing:1;
68 unsigned activating:1;
1bb5f66b
AS		 69
70 unsigned has_indicators:1;
71 u8 indicator[USB_MAXCHILDREN];
6d5aefb8 72 struct delayed_work leds;
1bb5f66b
AS		 73};
74
75
1da177e4 76/* Protect struct usb_device->state and ->children members
9ad3d6cc 77 * Note: Both are also protected by ->dev.sem, except that ->state can
1da177e4
LT		 78 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
79static DEFINE_SPINLOCK(device_state_lock);
80
81/* khubd's worklist and its lock */
82static DEFINE_SPINLOCK(hub_event_lock);
83static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
84
85/* Wakes up khubd */
86static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
87
9c8d6178 88static struct task_struct *khubd_task;
1da177e4
LT		 89
90/* cycle leds on hubs that aren't blinking for attention */
91static int blinkenlights = 0;
92module_param (blinkenlights, bool, S_IRUGO);
93MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
94
95/*
96 * As of 2.6.10 we introduce a new USB device initialization scheme which
97 * closely resembles the way Windows works. Hopefully it will be compatible
98 * with a wider range of devices than the old scheme. However some previously
99 * working devices may start giving rise to "device not accepting address"
100 * errors; if that happens the user can try the old scheme by adjusting the
101 * following module parameters.
102 *
103 * For maximum flexibility there are two boolean parameters to control the
104 * hub driver's behavior. On the first initialization attempt, if the
105 * "old_scheme_first" parameter is set then the old scheme will be used,
106 * otherwise the new scheme is used. If that fails and "use_both_schemes"
107 * is set, then the driver will make another attempt, using the other scheme.
108 */
109static int old_scheme_first = 0;
110module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
111MODULE_PARM_DESC(old_scheme_first,
112 "start with the old device initialization scheme");
113
114static int use_both_schemes = 1;
115module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
116MODULE_PARM_DESC(use_both_schemes,
117 "try the other device initialization scheme if the "
118 "first one fails");
119
120
404d5b18 121static inline char *portspeed(int portstatus)
1da177e4
LT		 122{
123 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
124 return "480 Mb/s";
125 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
126 return "1.5 Mb/s";
127 else
128 return "12 Mb/s";
129}
1da177e4
LT		 130
131/* Note that hdev or one of its children must be locked! */
132static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
133{
134 return usb_get_intfdata(hdev->actconfig->interface[0]);
135}
136
137/* USB 2.0 spec Section 11.24.4.5 */
138static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
139{
140 int i, ret;
141
142 for (i = 0; i < 3; i++) {
143 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
144 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
145 USB_DT_HUB << 8, 0, data, size,
146 USB_CTRL_GET_TIMEOUT);
147 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
148 return ret;
149 }
150 return -EINVAL;
151}
152
153/*
154 * USB 2.0 spec Section 11.24.2.1
155 */
156static int clear_hub_feature(struct usb_device *hdev, int feature)
157{
158 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
159 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
160}
161
162/*
163 * USB 2.0 spec Section 11.24.2.2
164 */
165static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
166{
167 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
168 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
169 NULL, 0, 1000);
170}
171
172/*
173 * USB 2.0 spec Section 11.24.2.13
174 */
175static int set_port_feature(struct usb_device *hdev, int port1, int feature)
176{
177 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
178 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
179 NULL, 0, 1000);
180}
181
182/*
183 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
184 * for info about using port indicators
185 */
186static void set_port_led(
187 struct usb_hub *hub,
188 int port1,
189 int selector
190)
191{
192 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
193 USB_PORT_FEAT_INDICATOR);
194 if (status < 0)
195 dev_dbg (hub->intfdev,
196 "port %d indicator %s status %d\n",
197 port1,
198 ({ char *s; switch (selector) {
199 case HUB_LED_AMBER: s = "amber"; break;
200 case HUB_LED_GREEN: s = "green"; break;
201 case HUB_LED_OFF: s = "off"; break;
202 case HUB_LED_AUTO: s = "auto"; break;
203 default: s = "??"; break;
204 }; s; }),
205 status);
206}
207
208#define LED_CYCLE_PERIOD ((2*HZ)/3)
209
c4028958 210static void led_work (struct work_struct *work)
1da177e4 211{
c4028958
DH		 212 struct usb_hub *hub =
213 container_of(work, struct usb_hub, leds.work);
1da177e4
LT		 214 struct usb_device *hdev = hub->hdev;
215 unsigned i;
216 unsigned changed = 0;
217 int cursor = -1;
218
219 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
220 return;
221
222 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
223 unsigned selector, mode;
224
225 /* 30%-50% duty cycle */
226
227 switch (hub->indicator[i]) {
228 /* cycle marker */
229 case INDICATOR_CYCLE:
230 cursor = i;
231 selector = HUB_LED_AUTO;
232 mode = INDICATOR_AUTO;
233 break;
234 /* blinking green = sw attention */
235 case INDICATOR_GREEN_BLINK:
236 selector = HUB_LED_GREEN;
237 mode = INDICATOR_GREEN_BLINK_OFF;
238 break;
239 case INDICATOR_GREEN_BLINK_OFF:
240 selector = HUB_LED_OFF;
241 mode = INDICATOR_GREEN_BLINK;
242 break;
243 /* blinking amber = hw attention */
244 case INDICATOR_AMBER_BLINK:
245 selector = HUB_LED_AMBER;
246 mode = INDICATOR_AMBER_BLINK_OFF;
247 break;
248 case INDICATOR_AMBER_BLINK_OFF:
249 selector = HUB_LED_OFF;
250 mode = INDICATOR_AMBER_BLINK;
251 break;
252 /* blink green/amber = reserved */
253 case INDICATOR_ALT_BLINK:
254 selector = HUB_LED_GREEN;
255 mode = INDICATOR_ALT_BLINK_OFF;
256 break;
257 case INDICATOR_ALT_BLINK_OFF:
258 selector = HUB_LED_AMBER;
259 mode = INDICATOR_ALT_BLINK;
260 break;
261 default:
262 continue;
263 }
264 if (selector != HUB_LED_AUTO)
265 changed = 1;
266 set_port_led(hub, i + 1, selector);
267 hub->indicator[i] = mode;
268 }
269 if (!changed && blinkenlights) {
270 cursor++;
271 cursor %= hub->descriptor->bNbrPorts;
272 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
273 hub->indicator[cursor] = INDICATOR_CYCLE;
274 changed++;
275 }
276 if (changed)
277 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
278}
279
280/* use a short timeout for hub/port status fetches */
281#define USB_STS_TIMEOUT 1000
282#define USB_STS_RETRIES 5
283
284/*
285 * USB 2.0 spec Section 11.24.2.6
286 */
287static int get_hub_status(struct usb_device *hdev,
288 struct usb_hub_status *data)
289{
290 int i, status = -ETIMEDOUT;
291
292 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
293 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
294 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
295 data, sizeof(*data), USB_STS_TIMEOUT);
296 }
297 return status;
298}
299
300/*
301 * USB 2.0 spec Section 11.24.2.7
302 */
303static int get_port_status(struct usb_device *hdev, int port1,
304 struct usb_port_status *data)
305{
306 int i, status = -ETIMEDOUT;
307
308 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
309 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
310 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
311 data, sizeof(*data), USB_STS_TIMEOUT);
312 }
313 return status;
314}
315
316static void kick_khubd(struct usb_hub *hub)
317{
318 unsigned long flags;
319
40f122f3
AS		 320 /* Suppress autosuspend until khubd runs */
321 to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
322
1da177e4
LT		 323 spin_lock_irqsave(&hub_event_lock, flags);
324 if (list_empty(&hub->event_list)) {
325 list_add_tail(&hub->event_list, &hub_event_list);
326 wake_up(&khubd_wait);
327 }
328 spin_unlock_irqrestore(&hub_event_lock, flags);
329}
330
331void usb_kick_khubd(struct usb_device *hdev)
332{
333 kick_khubd(hdev_to_hub(hdev));
334}
335
336
337/* completion function, fires on port status changes and various faults */
7d12e780 338static void hub_irq(struct urb *urb)
1da177e4 339{
ec17cf1c 340 struct usb_hub *hub = urb->context;
1da177e4
LT		 341 int status;
342 int i;
343 unsigned long bits;
344
345 switch (urb->status) {
346 case -ENOENT: /* synchronous unlink */
347 case -ECONNRESET: /* async unlink */
348 case -ESHUTDOWN: /* hardware going away */
349 return;
350
351 default: /* presumably an error */
352 /* Cause a hub reset after 10 consecutive errors */
353 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
354 if ((++hub->nerrors < 10) || hub->error)
355 goto resubmit;
356 hub->error = urb->status;
357 /* FALL THROUGH */
ec17cf1c 358
1da177e4
LT		 359 /* let khubd handle things */
360 case 0: /* we got data: port status changed */
361 bits = 0;
362 for (i = 0; i < urb->actual_length; ++i)
363 bits |= ((unsigned long) ((*hub->buffer)[i]))
364 << (i*8);
365 hub->event_bits[0] = bits;
366 break;
367 }
368
369 hub->nerrors = 0;
370
371 /* Something happened, let khubd figure it out */
372 kick_khubd(hub);
373
374resubmit:
375 if (hub->quiescing)
376 return;
377
378 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
379 && status != -ENODEV && status != -EPERM)
380 dev_err (hub->intfdev, "resubmit --> %d\n", status);
381}
382
383/* USB 2.0 spec Section 11.24.2.3 */
384static inline int
385hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
386{
387 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
388 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
389 tt, NULL, 0, 1000);
390}
391
392/*
393 * enumeration blocks khubd for a long time. we use keventd instead, since
394 * long blocking there is the exception, not the rule. accordingly, HCDs
395 * talking to TTs must queue control transfers (not just bulk and iso), so
396 * both can talk to the same hub concurrently.
397 */
c4028958 398static void hub_tt_kevent (struct work_struct *work)
1da177e4 399{
c4028958
DH		 400 struct usb_hub *hub =
401 container_of(work, struct usb_hub, tt.kevent);
1da177e4
LT		 402 unsigned long flags;
403
404 spin_lock_irqsave (&hub->tt.lock, flags);
405 while (!list_empty (&hub->tt.clear_list)) {
406 struct list_head *temp;
407 struct usb_tt_clear *clear;
408 struct usb_device *hdev = hub->hdev;
409 int status;
410
411 temp = hub->tt.clear_list.next;
412 clear = list_entry (temp, struct usb_tt_clear, clear_list);
413 list_del (&clear->clear_list);
414
415 /* drop lock so HCD can concurrently report other TT errors */
416 spin_unlock_irqrestore (&hub->tt.lock, flags);
417 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
418 spin_lock_irqsave (&hub->tt.lock, flags);
419
420 if (status)
421 dev_err (&hdev->dev,
422 "clear tt %d (%04x) error %d\n",
423 clear->tt, clear->devinfo, status);
1bc3c9e1 424 kfree(clear);
1da177e4
LT		 425 }
426 spin_unlock_irqrestore (&hub->tt.lock, flags);
427}
428
429/**
430 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
431 * @udev: the device whose split transaction failed
432 * @pipe: identifies the endpoint of the failed transaction
433 *
434 * High speed HCDs use this to tell the hub driver that some split control or
435 * bulk transaction failed in a way that requires clearing internal state of
436 * a transaction translator. This is normally detected (and reported) from
437 * interrupt context.
438 *
439 * It may not be possible for that hub to handle additional full (or low)
440 * speed transactions until that state is fully cleared out.
441 */
442void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
443{
444 struct usb_tt *tt = udev->tt;
445 unsigned long flags;
446 struct usb_tt_clear *clear;
447
448 /* we've got to cope with an arbitrary number of pending TT clears,
449 * since each TT has "at least two" buffers that can need it (and
450 * there can be many TTs per hub). even if they're uncommon.
451 */
54e6ecb2 452 if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
1da177e4
LT		 453 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
454 /* FIXME recover somehow ... RESET_TT? */
455 return;
456 }
457
458 /* info that CLEAR_TT_BUFFER needs */
459 clear->tt = tt->multi ? udev->ttport : 1;
460 clear->devinfo = usb_pipeendpoint (pipe);
461 clear->devinfo |= udev->devnum << 4;
462 clear->devinfo |= usb_pipecontrol (pipe)
463 ? (USB_ENDPOINT_XFER_CONTROL << 11)
464 : (USB_ENDPOINT_XFER_BULK << 11);
465 if (usb_pipein (pipe))
466 clear->devinfo |= 1 << 15;
467
468 /* tell keventd to clear state for this TT */
469 spin_lock_irqsave (&tt->lock, flags);
470 list_add_tail (&clear->clear_list, &tt->clear_list);
471 schedule_work (&tt->kevent);
472 spin_unlock_irqrestore (&tt->lock, flags);
473}
474
475static void hub_power_on(struct usb_hub *hub)
476{
477 int port1;
b789696a 478 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
4489a571
AS		 479 u16 wHubCharacteristics =
480 le16_to_cpu(hub->descriptor->wHubCharacteristics);
481
482 /* Enable power on each port. Some hubs have reserved values
483 * of LPSM (> 2) in their descriptors, even though they are
484 * USB 2.0 hubs. Some hubs do not implement port-power switching
485 * but only emulate it. In all cases, the ports won't work
486 * unless we send these messages to the hub.
487 */
488 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
1da177e4 489 dev_dbg(hub->intfdev, "enabling power on all ports\n");
4489a571
AS		 490 else
491 dev_dbg(hub->intfdev, "trying to enable port power on "
492 "non-switchable hub\n");
493 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
494 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
1da177e4 495
b789696a
DB		 496 /* Wait at least 100 msec for power to become stable */
497 msleep(max(pgood_delay, (unsigned) 100));
1da177e4
LT		 498}
499
02c399ee 500static void hub_quiesce(struct usb_hub *hub)
1da177e4 501{
979d5199 502 /* (nonblocking) khubd and related activity won't re-trigger */
1da177e4 503 hub->quiescing = 1;
c9f89fa4 504 hub->activating = 0;
979d5199 505
979d5199 506 /* (blocking) stop khubd and related activity */
1da177e4
LT		 507 usb_kill_urb(hub->urb);
508 if (hub->has_indicators)
509 cancel_delayed_work(&hub->leds);
510 if (hub->has_indicators || hub->tt.hub)
511 flush_scheduled_work();
512}
513
514static void hub_activate(struct usb_hub *hub)
515{
516 int status;
517
518 hub->quiescing = 0;
519 hub->activating = 1;
40f122f3 520
1da177e4
LT		 521 status = usb_submit_urb(hub->urb, GFP_NOIO);
522 if (status < 0)
523 dev_err(hub->intfdev, "activate --> %d\n", status);
524 if (hub->has_indicators && blinkenlights)
525 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
526
527 /* scan all ports ASAP */
528 kick_khubd(hub);
529}
530
531static int hub_hub_status(struct usb_hub *hub,
532 u16 *status, u16 *change)
533{
534 int ret;
535
db90e7a1 536 mutex_lock(&hub->status_mutex);
1da177e4
LT		 537 ret = get_hub_status(hub->hdev, &hub->status->hub);
538 if (ret < 0)
539 dev_err (hub->intfdev,
540 "%s failed (err = %d)\n", __FUNCTION__, ret);
541 else {
542 *status = le16_to_cpu(hub->status->hub.wHubStatus);
543 *change = le16_to_cpu(hub->status->hub.wHubChange);
544 ret = 0;
545 }
db90e7a1 546 mutex_unlock(&hub->status_mutex);
1da177e4
LT		 547 return ret;
548}
549
8b28c752
AS		 550static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
551{
552 struct usb_device *hdev = hub->hdev;
553 int ret;
554
555 if (hdev->children[port1-1] && set_state) {
556 usb_set_device_state(hdev->children[port1-1],
557 USB_STATE_NOTATTACHED);
558 }
559 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
560 if (ret)
561 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
562 port1, ret);
563
564 return ret;
565}
566
7d069b7d
AS		 567
568/* caller has locked the hub device */
7de18d8b 569static void hub_pre_reset(struct usb_interface *intf)
7d069b7d 570{
7de18d8b 571 struct usb_hub *hub = usb_get_intfdata(intf);
7d069b7d
AS		 572 struct usb_device *hdev = hub->hdev;
573 int port1;
574
575 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
576 if (hdev->children[port1 - 1]) {
577 usb_disconnect(&hdev->children[port1 - 1]);
7de18d8b 578 if (hub->error == 0)
7d069b7d
AS		 579 hub_port_disable(hub, port1, 0);
580 }
581 }
582 hub_quiesce(hub);
583}
584
585/* caller has locked the hub device */
7de18d8b 586static void hub_post_reset(struct usb_interface *intf)
7d069b7d 587{
7de18d8b
AS		 588 struct usb_hub *hub = usb_get_intfdata(intf);
589
7d069b7d
AS		 590 hub_activate(hub);
591 hub_power_on(hub);
592}
593
594
1da177e4
LT		 595static int hub_configure(struct usb_hub *hub,
596 struct usb_endpoint_descriptor *endpoint)
597{
598 struct usb_device *hdev = hub->hdev;
599 struct device *hub_dev = hub->intfdev;
600 u16 hubstatus, hubchange;
74ad9bd2 601 u16 wHubCharacteristics;
1da177e4
LT		 602 unsigned int pipe;
603 int maxp, ret;
604 char *message;
605
606 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
607 &hub->buffer_dma);
608 if (!hub->buffer) {
609 message = "can't allocate hub irq buffer";
610 ret = -ENOMEM;
611 goto fail;
612 }
613
614 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
615 if (!hub->status) {
616 message = "can't kmalloc hub status buffer";
617 ret = -ENOMEM;
618 goto fail;
619 }
db90e7a1 620 mutex_init(&hub->status_mutex);
1da177e4
LT		 621
622 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
623 if (!hub->descriptor) {
624 message = "can't kmalloc hub descriptor";
625 ret = -ENOMEM;
626 goto fail;
627 }
628
629 /* Request the entire hub descriptor.
630 * hub->descriptor can handle USB_MAXCHILDREN ports,
631 * but the hub can/will return fewer bytes here.
632 */
633 ret = get_hub_descriptor(hdev, hub->descriptor,
634 sizeof(*hub->descriptor));
635 if (ret < 0) {
636 message = "can't read hub descriptor";
637 goto fail;
638 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
639 message = "hub has too many ports!";
640 ret = -ENODEV;
641 goto fail;
642 }
643
644 hdev->maxchild = hub->descriptor->bNbrPorts;
645 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
646 (hdev->maxchild == 1) ? "" : "s");
647
74ad9bd2 648 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4 649
74ad9bd2 650 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
1da177e4
LT		 651 int i;
652 char portstr [USB_MAXCHILDREN + 1];
653
654 for (i = 0; i < hdev->maxchild; i++)
655 portstr[i] = hub->descriptor->DeviceRemovable
656 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
657 ? 'F' : 'R';
658 portstr[hdev->maxchild] = 0;
659 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
660 } else
661 dev_dbg(hub_dev, "standalone hub\n");
662
74ad9bd2 663 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1da177e4
LT		 664 case 0x00:
665 dev_dbg(hub_dev, "ganged power switching\n");
666 break;
667 case 0x01:
668 dev_dbg(hub_dev, "individual port power switching\n");
669 break;
670 case 0x02:
671 case 0x03:
672 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
673 break;
674 }
675
74ad9bd2 676 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1da177e4
LT		 677 case 0x00:
678 dev_dbg(hub_dev, "global over-current protection\n");
679 break;
680 case 0x08:
681 dev_dbg(hub_dev, "individual port over-current protection\n");
682 break;
683 case 0x10:
684 case 0x18:
685 dev_dbg(hub_dev, "no over-current protection\n");
686 break;
687 }
688
689 spin_lock_init (&hub->tt.lock);
690 INIT_LIST_HEAD (&hub->tt.clear_list);
c4028958 691 INIT_WORK (&hub->tt.kevent, hub_tt_kevent);
1da177e4
LT		 692 switch (hdev->descriptor.bDeviceProtocol) {
693 case 0:
694 break;
695 case 1:
696 dev_dbg(hub_dev, "Single TT\n");
697 hub->tt.hub = hdev;
698 break;
699 case 2:
700 ret = usb_set_interface(hdev, 0, 1);
701 if (ret == 0) {
702 dev_dbg(hub_dev, "TT per port\n");
703 hub->tt.multi = 1;
704 } else
705 dev_err(hub_dev, "Using single TT (err %d)\n",
706 ret);
707 hub->tt.hub = hdev;
708 break;
709 default:
710 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
711 hdev->descriptor.bDeviceProtocol);
712 break;
713 }
714
e09711ae 715 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
74ad9bd2 716 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
e09711ae
DB		 717 case HUB_TTTT_8_BITS:
718 if (hdev->descriptor.bDeviceProtocol != 0) {
719 hub->tt.think_time = 666;
720 dev_dbg(hub_dev, "TT requires at most %d "
721 "FS bit times (%d ns)\n",
722 8, hub->tt.think_time);
723 }
1da177e4 724 break;
e09711ae
DB		 725 case HUB_TTTT_16_BITS:
726 hub->tt.think_time = 666 * 2;
727 dev_dbg(hub_dev, "TT requires at most %d "
728 "FS bit times (%d ns)\n",
729 16, hub->tt.think_time);
1da177e4 730 break;
e09711ae
DB		 731 case HUB_TTTT_24_BITS:
732 hub->tt.think_time = 666 * 3;
733 dev_dbg(hub_dev, "TT requires at most %d "
734 "FS bit times (%d ns)\n",
735 24, hub->tt.think_time);
1da177e4 736 break;
e09711ae
DB		 737 case HUB_TTTT_32_BITS:
738 hub->tt.think_time = 666 * 4;
739 dev_dbg(hub_dev, "TT requires at most %d "
740 "FS bit times (%d ns)\n",
741 32, hub->tt.think_time);
1da177e4
LT		 742 break;
743 }
744
745 /* probe() zeroes hub->indicator[] */
74ad9bd2 746 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1da177e4
LT		 747 hub->has_indicators = 1;
748 dev_dbg(hub_dev, "Port indicators are supported\n");
749 }
750
751 dev_dbg(hub_dev, "power on to power good time: %dms\n",
752 hub->descriptor->bPwrOn2PwrGood * 2);
753
754 /* power budgeting mostly matters with bus-powered hubs,
755 * and battery-powered root hubs (may provide just 8 mA).
756 */
757 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
55c52718 758 if (ret < 2) {
1da177e4
LT		 759 message = "can't get hub status";
760 goto fail;
761 }
7d35b929
AS		 762 le16_to_cpus(&hubstatus);
763 if (hdev == hdev->bus->root_hub) {
55c52718
AS		 764 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
765 hub->mA_per_port = 500;
766 else {
767 hub->mA_per_port = hdev->bus_mA;
768 hub->limited_power = 1;
769 }
7d35b929 770 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1da177e4
LT		 771 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
772 hub->descriptor->bHubContrCurrent);
55c52718
AS		 773 hub->limited_power = 1;
774 if (hdev->maxchild > 0) {
775 int remaining = hdev->bus_mA -
776 hub->descriptor->bHubContrCurrent;
777
778 if (remaining < hdev->maxchild * 100)
779 dev_warn(hub_dev,
780 "insufficient power available "
781 "to use all downstream ports\n");
782 hub->mA_per_port = 100; /* 7.2.1.1 */
783 }
784 } else { /* Self-powered external hub */
785 /* FIXME: What about battery-powered external hubs that
786 * provide less current per port? */
787 hub->mA_per_port = 500;
7d35b929 788 }
55c52718
AS		 789 if (hub->mA_per_port < 500)
790 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
791 hub->mA_per_port);
1da177e4
LT		 792
793 ret = hub_hub_status(hub, &hubstatus, &hubchange);
794 if (ret < 0) {
795 message = "can't get hub status";
796 goto fail;
797 }
798
799 /* local power status reports aren't always correct */
800 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
801 dev_dbg(hub_dev, "local power source is %s\n",
802 (hubstatus & HUB_STATUS_LOCAL_POWER)
803 ? "lost (inactive)" : "good");
804
74ad9bd2 805 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1da177e4
LT		 806 dev_dbg(hub_dev, "%sover-current condition exists\n",
807 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
808
88fafff9 809 /* set up the interrupt endpoint
810 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
811 * bytes as USB2.0[11.12.3] says because some hubs are known
812 * to send more data (and thus cause overflow). For root hubs,
813 * maxpktsize is defined in hcd.c's fake endpoint descriptors
814 * to be big enough for at least USB_MAXCHILDREN ports. */
1da177e4
LT		 815 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
816 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
817
818 if (maxp > sizeof(*hub->buffer))
819 maxp = sizeof(*hub->buffer);
820
821 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
822 if (!hub->urb) {
823 message = "couldn't allocate interrupt urb";
824 ret = -ENOMEM;
825 goto fail;
826 }
827
828 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
829 hub, endpoint->bInterval);
830 hub->urb->transfer_dma = hub->buffer_dma;
831 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
832
833 /* maybe cycle the hub leds */
834 if (hub->has_indicators && blinkenlights)
835 hub->indicator [0] = INDICATOR_CYCLE;
836
837 hub_power_on(hub);
838 hub_activate(hub);
839 return 0;
840
841fail:
842 dev_err (hub_dev, "config failed, %s (err %d)\n",
843 message, ret);
844 /* hub_disconnect() frees urb and descriptor */
845 return ret;
846}
847
848static unsigned highspeed_hubs;
849
850static void hub_disconnect(struct usb_interface *intf)
851{
852 struct usb_hub *hub = usb_get_intfdata (intf);
853 struct usb_device *hdev;
854
7de18d8b
AS		 855 /* Disconnect all children and quiesce the hub */
856 hub->error = 0;
857 hub_pre_reset(intf);
858
8b28c752 859 usb_set_intfdata (intf, NULL);
1da177e4
LT		 860 hdev = hub->hdev;
861
862 if (hdev->speed == USB_SPEED_HIGH)
863 highspeed_hubs--;
864
1da177e4
LT		 865 usb_free_urb(hub->urb);
866 hub->urb = NULL;
867
868 spin_lock_irq(&hub_event_lock);
869 list_del_init(&hub->event_list);
870 spin_unlock_irq(&hub_event_lock);
871
1bc3c9e1
JJ		 872 kfree(hub->descriptor);
873 hub->descriptor = NULL;
1da177e4 874
1bc3c9e1
JJ		 875 kfree(hub->status);
876 hub->status = NULL;
1da177e4
LT		 877
878 if (hub->buffer) {
879 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
880 hub->buffer_dma);
881 hub->buffer = NULL;
882 }
883
7d069b7d 884 kfree(hub);
1da177e4
LT		 885}
886
887static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
888{
889 struct usb_host_interface *desc;
890 struct usb_endpoint_descriptor *endpoint;
891 struct usb_device *hdev;
892 struct usb_hub *hub;
893
894 desc = intf->cur_altsetting;
895 hdev = interface_to_usbdev(intf);
896
89ccbdc9
DB		 897#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
898 if (hdev->parent) {
899 dev_warn(&intf->dev, "ignoring external hub\n");
900 return -ENODEV;
901 }
902#endif
903
1da177e4
LT		 904 /* Some hubs have a subclass of 1, which AFAICT according to the */
905 /* specs is not defined, but it works */
906 if ((desc->desc.bInterfaceSubClass != 0) &&
907 (desc->desc.bInterfaceSubClass != 1)) {
908descriptor_error:
909 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
910 return -EIO;
911 }
912
913 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
914 if (desc->desc.bNumEndpoints != 1)
915 goto descriptor_error;
916
917 endpoint = &desc->endpoint[0].desc;
918
fbf81c29
LFC		 919 /* If it's not an interrupt in endpoint, we'd better punt! */
920 if (!usb_endpoint_is_int_in(endpoint))
1da177e4
LT		 921 goto descriptor_error;
922
923 /* We found a hub */
924 dev_info (&intf->dev, "USB hub found\n");
925
0a1ef3b5 926 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1da177e4
LT		 927 if (!hub) {
928 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
929 return -ENOMEM;
930 }
931
1da177e4
LT		 932 INIT_LIST_HEAD(&hub->event_list);
933 hub->intfdev = &intf->dev;
934 hub->hdev = hdev;
c4028958 935 INIT_DELAYED_WORK(&hub->leds, led_work);
1da177e4
LT		 936
937 usb_set_intfdata (intf, hub);
40f122f3 938 intf->needs_remote_wakeup = 1;
1da177e4
LT		 939
940 if (hdev->speed == USB_SPEED_HIGH)
941 highspeed_hubs++;
942
943 if (hub_configure(hub, endpoint) >= 0)
944 return 0;
945
946 hub_disconnect (intf);
947 return -ENODEV;
948}
949
950static int
951hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
952{
953 struct usb_device *hdev = interface_to_usbdev (intf);
954
955 /* assert ifno == 0 (part of hub spec) */
956 switch (code) {
957 case USBDEVFS_HUB_PORTINFO: {
958 struct usbdevfs_hub_portinfo *info = user_data;
959 int i;
960
961 spin_lock_irq(&device_state_lock);
962 if (hdev->devnum <= 0)
963 info->nports = 0;
964 else {
965 info->nports = hdev->maxchild;
966 for (i = 0; i < info->nports; i++) {
967 if (hdev->children[i] == NULL)
968 info->port[i] = 0;
969 else
970 info->port[i] =
971 hdev->children[i]->devnum;
972 }
973 }
974 spin_unlock_irq(&device_state_lock);
975
976 return info->nports + 1;
977 }
978
979 default:
980 return -ENOSYS;
981 }
982}
983
1da177e4
LT		 984
985/* grab device/port lock, returning index of that port (zero based).
986 * protects the upstream link used by this device from concurrent
987 * tree operations like suspend, resume, reset, and disconnect, which
988 * apply to everything downstream of a given port.
989 */
990static int locktree(struct usb_device *udev)
991{
992 int t;
993 struct usb_device *hdev;
994
995 if (!udev)
996 return -ENODEV;
997
998 /* root hub is always the first lock in the series */
999 hdev = udev->parent;
1000 if (!hdev) {
1001 usb_lock_device(udev);
1002 return 0;
1003 }
1004
1005 /* on the path from root to us, lock everything from
1006 * top down, dropping parent locks when not needed
1007 */
1008 t = locktree(hdev);
1009 if (t < 0)
1010 return t;
1da177e4 1011
12c3da34
AS		 1012 /* everything is fail-fast once disconnect
1013 * processing starts
1014 */
1015 if (udev->state == USB_STATE_NOTATTACHED) {
1016 usb_unlock_device(hdev);
1017 return -ENODEV;
1da177e4 1018 }
12c3da34
AS		 1019
1020 /* when everyone grabs locks top->bottom,
1021 * non-overlapping work may be concurrent
1022 */
1023 usb_lock_device(udev);
1da177e4 1024 usb_unlock_device(hdev);
12c3da34 1025 return udev->portnum;
1da177e4
LT		 1026}
1027
1028static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1029{
1030 int i;
1031
1032 for (i = 0; i < udev->maxchild; ++i) {
1033 if (udev->children[i])
1034 recursively_mark_NOTATTACHED(udev->children[i]);
1035 }
ee49fb5d
AS		 1036 if (udev->state == USB_STATE_SUSPENDED)
1037 udev->discon_suspended = 1;
1da177e4
LT		 1038 udev->state = USB_STATE_NOTATTACHED;
1039}
1040
1041/**
1042 * usb_set_device_state - change a device's current state (usbcore, hcds)
1043 * @udev: pointer to device whose state should be changed
1044 * @new_state: new state value to be stored
1045 *
1046 * udev->state is _not_ fully protected by the device lock. Although
1047 * most transitions are made only while holding the lock, the state can
1048 * can change to USB_STATE_NOTATTACHED at almost any time. This
1049 * is so that devices can be marked as disconnected as soon as possible,
1050 * without having to wait for any semaphores to be released. As a result,
1051 * all changes to any device's state must be protected by the
1052 * device_state_lock spinlock.
1053 *
1054 * Once a device has been added to the device tree, all changes to its state
1055 * should be made using this routine. The state should _not_ be set directly.
1056 *
1057 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1058 * Otherwise udev->state is set to new_state, and if new_state is
1059 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1060 * to USB_STATE_NOTATTACHED.
1061 */
1062void usb_set_device_state(struct usb_device *udev,
1063 enum usb_device_state new_state)
1064{
1065 unsigned long flags;
1066
1067 spin_lock_irqsave(&device_state_lock, flags);
1068 if (udev->state == USB_STATE_NOTATTACHED)
1069 ; /* do nothing */
b94dc6b5 1070 else if (new_state != USB_STATE_NOTATTACHED) {
fb669cc0
DB		 1071
1072 /* root hub wakeup capabilities are managed out-of-band
1073 * and may involve silicon errata ... ignore them here.
1074 */
1075 if (udev->parent) {
645daaab
AS		 1076 if (udev->state == USB_STATE_SUSPENDED
1077 || new_state == USB_STATE_SUSPENDED)
1078 ; /* No change to wakeup settings */
1079 else if (new_state == USB_STATE_CONFIGURED)
fb669cc0
DB		 1080 device_init_wakeup(&udev->dev,
1081 (udev->actconfig->desc.bmAttributes
1082 & USB_CONFIG_ATT_WAKEUP));
645daaab 1083 else
fb669cc0
DB		 1084 device_init_wakeup(&udev->dev, 0);
1085 }
645daaab 1086 udev->state = new_state;
b94dc6b5 1087 } else
1da177e4
LT		 1088 recursively_mark_NOTATTACHED(udev);
1089 spin_unlock_irqrestore(&device_state_lock, flags);
1090}
1da177e4
LT		 1091
1092
d388dab7 1093#ifdef CONFIG_PM
1c50c317
AS		 1094
1095/**
1096 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1097 * @rhdev: struct usb_device for the root hub
1098 *
1099 * The USB host controller driver calls this function when its root hub
1100 * is resumed and Vbus power has been interrupted or the controller
1101 * has been reset. The routine marks all the children of the root hub
1102 * as NOTATTACHED and marks logical connect-change events on their ports.
1103 */
1104void usb_root_hub_lost_power(struct usb_device *rhdev)
1105{
1106 struct usb_hub *hub;
1107 int port1;
1108 unsigned long flags;
1109
1110 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
353a4098 1111
1c50c317
AS		 1112 spin_lock_irqsave(&device_state_lock, flags);
1113 hub = hdev_to_hub(rhdev);
1114 for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
1115 if (rhdev->children[port1 - 1]) {
1116 recursively_mark_NOTATTACHED(
1117 rhdev->children[port1 - 1]);
1118 set_bit(port1, hub->change_bits);
1119 }
1120 }
1121 spin_unlock_irqrestore(&device_state_lock, flags);
1122}
1123EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1124
d388dab7 1125#endif /* CONFIG_PM */
1c50c317 1126
1da177e4
LT		 1127static void choose_address(struct usb_device *udev)
1128{
1129 int devnum;
1130 struct usb_bus *bus = udev->bus;
1131
1132 /* If khubd ever becomes multithreaded, this will need a lock */
1133
1134 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1135 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1136 bus->devnum_next);
1137 if (devnum >= 128)
1138 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1139
1140 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1141
1142 if (devnum < 128) {
1143 set_bit(devnum, bus->devmap.devicemap);
1144 udev->devnum = devnum;
1145 }
1146}
1147
1148static void release_address(struct usb_device *udev)
1149{
1150 if (udev->devnum > 0) {
1151 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1152 udev->devnum = -1;
1153 }
1154}
1155
d5d4db70
AS		 1156#ifdef CONFIG_USB_SUSPEND
1157
1158static void usb_stop_pm(struct usb_device *udev)
1159{
1160 /* Synchronize with the ksuspend thread to prevent any more
1161 * autosuspend requests from being submitted, and decrement
1162 * the parent's count of unsuspended children.
1163 */
1164 usb_pm_lock(udev);
1165 if (udev->parent && !udev->discon_suspended)
1166 usb_autosuspend_device(udev->parent);
1167 usb_pm_unlock(udev);
1168
1169 /* Stop any autosuspend requests already submitted */
1170 cancel_rearming_delayed_work(&udev->autosuspend);
1171}
1172
1173#else
1174
1175static inline void usb_stop_pm(struct usb_device *udev)
1176{ }
1177
1178#endif
1179
1da177e4
LT		 1180/**
1181 * usb_disconnect - disconnect a device (usbcore-internal)
1182 * @pdev: pointer to device being disconnected
1183 * Context: !in_interrupt ()
1184 *
1185 * Something got disconnected. Get rid of it and all of its children.
1186 *
1187 * If *pdev is a normal device then the parent hub must already be locked.
1188 * If *pdev is a root hub then this routine will acquire the
1189 * usb_bus_list_lock on behalf of the caller.
1190 *
1191 * Only hub drivers (including virtual root hub drivers for host
1192 * controllers) should ever call this.
1193 *
1194 * This call is synchronous, and may not be used in an interrupt context.
1195 */
1196void usb_disconnect(struct usb_device **pdev)
1197{
1198 struct usb_device *udev = *pdev;
1199 int i;
1200
1201 if (!udev) {
1202 pr_debug ("%s nodev\n", __FUNCTION__);
1203 return;
1204 }
1205
1206 /* mark the device as inactive, so any further urb submissions for
1207 * this device (and any of its children) will fail immediately.
1208 * this quiesces everyting except pending urbs.
1209 */
1210 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1da177e4
LT		 1211 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1212
9ad3d6cc
AS		 1213 usb_lock_device(udev);
1214
1da177e4
LT		 1215 /* Free up all the children before we remove this device */
1216 for (i = 0; i < USB_MAXCHILDREN; i++) {
1217 if (udev->children[i])
1218 usb_disconnect(&udev->children[i]);
1219 }
1220
1221 /* deallocate hcd/hardware state ... nuking all pending urbs and
1222 * cleaning up all state associated with the current configuration
1223 * so that the hardware is now fully quiesced.
1224 */
782da727 1225 dev_dbg (&udev->dev, "unregistering device\n");
1da177e4
LT		 1226 usb_disable_device(udev, 0);
1227
782da727
AS		 1228 usb_unlock_device(udev);
1229
1230 /* Unregister the device. The device driver is responsible
1231 * for removing the device files from usbfs and sysfs and for
1232 * de-configuring the device.
1233 */
1234 device_del(&udev->dev);
3099e75a 1235
782da727 1236 /* Free the device number and delete the parent's children[]
1da177e4
LT		 1237 * (or root_hub) pointer.
1238 */
1da177e4 1239 release_address(udev);
1da177e4
LT		 1240
1241 /* Avoid races with recursively_mark_NOTATTACHED() */
1242 spin_lock_irq(&device_state_lock);
1243 *pdev = NULL;
1244 spin_unlock_irq(&device_state_lock);
1245
d5d4db70 1246 usb_stop_pm(udev);
ee49fb5d 1247
782da727 1248 put_device(&udev->dev);
1da177e4
LT		 1249}
1250
1251#ifdef DEBUG
1252static void show_string(struct usb_device *udev, char *id, char *string)
1253{
1254 if (!string)
1255 return;
1256 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1257}
1258
1259#else
1260static inline void show_string(struct usb_device *udev, char *id, char *string)
1261{}
1262#endif
1263
1da177e4
LT		 1264
1265#ifdef CONFIG_USB_OTG
1266#include "otg_whitelist.h"
11bd44ab 1267static int __usb_port_suspend(struct usb_device *, int port1);
1da177e4
LT		 1268#endif
1269
3ede760f
ON		 1270/**
1271 * usb_new_device - perform initial device setup (usbcore-internal)
1272 * @udev: newly addressed device (in ADDRESS state)
1273 *
1274 * This is called with devices which have been enumerated, but not yet
1275 * configured. The device descriptor is available, but not descriptors
1276 * for any device configuration. The caller must have locked either
1277 * the parent hub (if udev is a normal device) or else the
1278 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1279 * udev has already been installed, but udev is not yet visible through
1280 * sysfs or other filesystem code.
1281 *
1282 * It will return if the device is configured properly or not. Zero if
1283 * the interface was registered with the driver core; else a negative
1284 * errno value.
1285 *
1286 * This call is synchronous, and may not be used in an interrupt context.
1287 *
1288 * Only the hub driver or root-hub registrar should ever call this.
1289 */
1290int usb_new_device(struct usb_device *udev)
1da177e4
LT		 1291{
1292 int err;
1da177e4 1293
7ceec1f1
ON		 1294 /* Determine quirks */
1295 usb_detect_quirks(udev);
1296
1da177e4
LT		 1297 err = usb_get_configuration(udev);
1298 if (err < 0) {
1299 dev_err(&udev->dev, "can't read configurations, error %d\n",
1300 err);
1301 goto fail;
1302 }
1303
1304 /* read the standard strings and cache them if present */
4f62efe6
AS		 1305 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1306 udev->manufacturer = usb_cache_string(udev,
1307 udev->descriptor.iManufacturer);
1308 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1da177e4
LT		 1309
1310 /* Tell the world! */
1311 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1312 "SerialNumber=%d\n",
1313 udev->descriptor.iManufacturer,
1314 udev->descriptor.iProduct,
1315 udev->descriptor.iSerialNumber);
1316 show_string(udev, "Product", udev->product);
1317 show_string(udev, "Manufacturer", udev->manufacturer);
1318 show_string(udev, "SerialNumber", udev->serial);
1319
1320#ifdef CONFIG_USB_OTG
1321 /*
1322 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1323 * to wake us after we've powered off VBUS; and HNP, switching roles
1324 * "host" to "peripheral". The OTG descriptor helps figure this out.
1325 */
1326 if (!udev->bus->is_b_host
1327 && udev->config
1328 && udev->parent == udev->bus->root_hub) {
1329 struct usb_otg_descriptor *desc = 0;
1330 struct usb_bus *bus = udev->bus;
1331
1332 /* descriptor may appear anywhere in config */
1333 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1334 le16_to_cpu(udev->config[0].desc.wTotalLength),
1335 USB_DT_OTG, (void **) &desc) == 0) {
1336 if (desc->bmAttributes & USB_OTG_HNP) {
12c3da34 1337 unsigned port1 = udev->portnum;
fc849b85 1338
1da177e4
LT		 1339 dev_info(&udev->dev,
1340 "Dual-Role OTG device on %sHNP port\n",
1341 (port1 == bus->otg_port)
1342 ? "" : "non-");
1343
1344 /* enable HNP before suspend, it's simpler */
1345 if (port1 == bus->otg_port)
1346 bus->b_hnp_enable = 1;
1347 err = usb_control_msg(udev,
1348 usb_sndctrlpipe(udev, 0),
1349 USB_REQ_SET_FEATURE, 0,
1350 bus->b_hnp_enable
1351 ? USB_DEVICE_B_HNP_ENABLE
1352 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1353 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1354 if (err < 0) {
1355 /* OTG MESSAGE: report errors here,
1356 * customize to match your product.
1357 */
1358 dev_info(&udev->dev,
1359 "can't set HNP mode; %d\n",
1360 err);
1361 bus->b_hnp_enable = 0;
1362 }
1363 }
1364 }
1365 }
1366
1367 if (!is_targeted(udev)) {
1368
1369 /* Maybe it can talk to us, though we can't talk to it.
1370 * (Includes HNP test device.)
1371 */
1372 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
140d8f68 1373 err = __usb_port_suspend(udev, udev->bus->otg_port);
1da177e4
LT		 1374 if (err < 0)
1375 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1376 }
1377 err = -ENODEV;
1378 goto fail;
1379 }
1380#endif
1381
9f8b17e6
KS		 1382 /* export the usbdev device-node for libusb */
1383 udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
1384 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1385
782da727 1386 /* Register the device. The device driver is responsible
9f8b17e6
KS		 1387 * for adding the device files to sysfs and for configuring
1388 * the device.
782da727 1389 */
9f8b17e6 1390 err = device_add(&udev->dev);
1da177e4
LT		 1391 if (err) {
1392 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1393 goto fail;
1394 }
9ad3d6cc 1395
ee49fb5d
AS		 1396 /* Increment the parent's count of unsuspended children */
1397 if (udev->parent)
94fcda1f 1398 usb_autoresume_device(udev->parent);
ee49fb5d 1399
c066475e 1400exit:
c066475e 1401 return err;
1da177e4
LT		 1402
1403fail:
1404 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
c066475e 1405 goto exit;
1da177e4
LT		 1406}
1407
1da177e4
LT		 1408static int hub_port_status(struct usb_hub *hub, int port1,
1409 u16 *status, u16 *change)
1410{
1411 int ret;
1412
db90e7a1 1413 mutex_lock(&hub->status_mutex);
1da177e4 1414 ret = get_port_status(hub->hdev, port1, &hub->status->port);
d25450c6 1415 if (ret < 4) {
1da177e4
LT		 1416 dev_err (hub->intfdev,
1417 "%s failed (err = %d)\n", __FUNCTION__, ret);
d25450c6
AS		 1418 if (ret >= 0)
1419 ret = -EIO;
1420 } else {
1da177e4
LT		 1421 *status = le16_to_cpu(hub->status->port.wPortStatus);
1422 *change = le16_to_cpu(hub->status->port.wPortChange);
1423 ret = 0;
1424 }
db90e7a1 1425 mutex_unlock(&hub->status_mutex);
1da177e4
LT		 1426 return ret;
1427}
1428
0165de09
IPG		 1429
1430/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1431static unsigned hub_is_wusb(struct usb_hub *hub)
1432{
1433 struct usb_hcd *hcd;
1434 if (hub->hdev->parent != NULL) /* not a root hub? */
1435 return 0;
1436 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1437 return hcd->wireless;
1438}
1439
1440
1da177e4
LT		 1441#define PORT_RESET_TRIES 5
1442#define SET_ADDRESS_TRIES 2
1443#define GET_DESCRIPTOR_TRIES 2
1444#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1445#define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1446
1447#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1448#define HUB_SHORT_RESET_TIME 10
1449#define HUB_LONG_RESET_TIME 200
1450#define HUB_RESET_TIMEOUT 500
1451
1452static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1453 struct usb_device *udev, unsigned int delay)
1454{
1455 int delay_time, ret;
1456 u16 portstatus;
1457 u16 portchange;
1458
1459 for (delay_time = 0;
1460 delay_time < HUB_RESET_TIMEOUT;
1461 delay_time += delay) {
1462 /* wait to give the device a chance to reset */
1463 msleep(delay);
1464
1465 /* read and decode port status */
1466 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1467 if (ret < 0)
1468 return ret;
1469
1470 /* Device went away? */
1471 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1472 return -ENOTCONN;
1473
1474 /* bomb out completely if something weird happened */
1475 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1476 return -EINVAL;
1477
1478 /* if we`ve finished resetting, then break out of the loop */
1479 if (!(portstatus & USB_PORT_STAT_RESET) &&
1480 (portstatus & USB_PORT_STAT_ENABLE)) {
0165de09
IPG		 1481 if (hub_is_wusb(hub))
1482 udev->speed = USB_SPEED_VARIABLE;
1483 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1da177e4
LT		 1484 udev->speed = USB_SPEED_HIGH;
1485 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1486 udev->speed = USB_SPEED_LOW;
1487 else
1488 udev->speed = USB_SPEED_FULL;
1489 return 0;
1490 }
1491
1492 /* switch to the long delay after two short delay failures */
1493 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1494 delay = HUB_LONG_RESET_TIME;
1495
1496 dev_dbg (hub->intfdev,
1497 "port %d not reset yet, waiting %dms\n",
1498 port1, delay);
1499 }
1500
1501 return -EBUSY;
1502}
1503
1504static int hub_port_reset(struct usb_hub *hub, int port1,
1505 struct usb_device *udev, unsigned int delay)
1506{
1507 int i, status;
1508
1509 /* Reset the port */
1510 for (i = 0; i < PORT_RESET_TRIES; i++) {
1511 status = set_port_feature(hub->hdev,
1512 port1, USB_PORT_FEAT_RESET);
1513 if (status)
1514 dev_err(hub->intfdev,
1515 "cannot reset port %d (err = %d)\n",
1516 port1, status);
1517 else {
1518 status = hub_port_wait_reset(hub, port1, udev, delay);
dd16525b 1519 if (status && status != -ENOTCONN)
1da177e4
LT		 1520 dev_dbg(hub->intfdev,
1521 "port_wait_reset: err = %d\n",
1522 status);
1523 }
1524
1525 /* return on disconnect or reset */
1526 switch (status) {
1527 case 0:
b789696a
DB		 1528 /* TRSTRCY = 10 ms; plus some extra */
1529 msleep(10 + 40);
1da177e4
LT		 1530 /* FALL THROUGH */
1531 case -ENOTCONN:
1532 case -ENODEV:
1533 clear_port_feature(hub->hdev,
1534 port1, USB_PORT_FEAT_C_RESET);
1535 /* FIXME need disconnect() for NOTATTACHED device */
1536 usb_set_device_state(udev, status
1537 ? USB_STATE_NOTATTACHED
1538 : USB_STATE_DEFAULT);
1539 return status;
1540 }
1541
1542 dev_dbg (hub->intfdev,
1543 "port %d not enabled, trying reset again...\n",
1544 port1);
1545 delay = HUB_LONG_RESET_TIME;
1546 }
1547
1548 dev_err (hub->intfdev,
1549 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1550 port1);
1551
1552 return status;
1553}
1554
1da177e4
LT		 1555/*
1556 * Disable a port and mark a logical connnect-change event, so that some
1557 * time later khubd will disconnect() any existing usb_device on the port
1558 * and will re-enumerate if there actually is a device attached.
1559 */
1560static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1561{
1562 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1563 hub_port_disable(hub, port1, 1);
1564
1565 /* FIXME let caller ask to power down the port:
1566 * - some devices won't enumerate without a VBUS power cycle
1567 * - SRP saves power that way
390a8c34 1568 * - ... new call, TBD ...
1da177e4
LT		 1569 * That's easy if this hub can switch power per-port, and
1570 * khubd reactivates the port later (timer, SRP, etc).
1571 * Powerdown must be optional, because of reset/DFU.
1572 */
1573
1574 set_bit(port1, hub->change_bits);
1575 kick_khubd(hub);
1576}
1577
d388dab7 1578#ifdef CONFIG_PM
1da177e4
LT		 1579
1580#ifdef CONFIG_USB_SUSPEND
1581
1582/*
1583 * Selective port suspend reduces power; most suspended devices draw
1584 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1585 * All devices below the suspended port are also suspended.
1586 *
1587 * Devices leave suspend state when the host wakes them up. Some devices
1588 * also support "remote wakeup", where the device can activate the USB
1589 * tree above them to deliver data, such as a keypress or packet. In
1590 * some cases, this wakes the USB host.
1591 */
1592static int hub_port_suspend(struct usb_hub *hub, int port1,
1593 struct usb_device *udev)
1594{
1595 int status;
1596
1597 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1598
1599 /* enable remote wakeup when appropriate; this lets the device
1600 * wake up the upstream hub (including maybe the root hub).
1601 *
1602 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1603 * we don't explicitly enable it here.
1604 */
645daaab 1605 if (udev->do_remote_wakeup) {
1da177e4
LT		 1606 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1607 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1608 USB_DEVICE_REMOTE_WAKEUP, 0,
1609 NULL, 0,
1610 USB_CTRL_SET_TIMEOUT);
1611 if (status)
1612 dev_dbg(&udev->dev,
1613 "won't remote wakeup, status %d\n",
1614 status);
1615 }
1616
1617 /* see 7.1.7.6 */
1618 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1619 if (status) {
1620 dev_dbg(hub->intfdev,
1621 "can't suspend port %d, status %d\n",
1622 port1, status);
1623 /* paranoia: "should not happen" */
1624 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1625 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1626 USB_DEVICE_REMOTE_WAKEUP, 0,
1627 NULL, 0,
1628 USB_CTRL_SET_TIMEOUT);
1629 } else {
1630 /* device has up to 10 msec to fully suspend */
645daaab
AS		 1631 dev_dbg(&udev->dev, "usb %ssuspend\n",
1632 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1633 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1634 msleep(10);
1635 }
1636 return status;
1637}
1638
1639/*
1640 * Devices on USB hub ports have only one "suspend" state, corresponding
ba9d35fb 1641 * to ACPI D2, "may cause the device to lose some context".
1da177e4
LT		 1642 * State transitions include:
1643 *
1644 * - suspend, resume ... when the VBUS power link stays live
1645 * - suspend, disconnect ... VBUS lost
1646 *
1647 * Once VBUS drop breaks the circuit, the port it's using has to go through
1648 * normal re-enumeration procedures, starting with enabling VBUS power.
1649 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1650 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1651 * timer, no SRP, no requests through sysfs.
390a8c34
DB		 1652 *
1653 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1654 * the root hub for their bus goes into global suspend ... so we don't
1655 * (falsely) update the device power state to say it suspended.
1da177e4 1656 */
140d8f68 1657static int __usb_port_suspend (struct usb_device *udev, int port1)
1da177e4 1658{
f3f3253d 1659 int status = 0;
1da177e4
LT		 1660
1661 /* caller owns the udev device lock */
1662 if (port1 < 0)
1663 return port1;
1664
140d8f68
AS		 1665 /* we change the device's upstream USB link,
1666 * but root hubs have no upstream USB link.
1da177e4 1667 */
f3f3253d 1668 if (udev->parent)
1da177e4
LT		 1669 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1670 udev);
2bf4086d 1671 else {
645daaab
AS		 1672 dev_dbg(&udev->dev, "usb %ssuspend\n",
1673 udev->auto_pm ? "auto-" : "");
2bf4086d
AS		 1674 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1675 }
1da177e4
LT		 1676 return status;
1677}
1678
5edbfb7c 1679/*
140d8f68 1680 * usb_port_suspend - suspend a usb device's upstream port
1da177e4 1681 * @udev: device that's no longer in active use
5edbfb7c 1682 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1683 *
1684 * Suspends a USB device that isn't in active use, conserving power.
1685 * Devices may wake out of a suspend, if anything important happens,
1686 * using the remote wakeup mechanism. They may also be taken out of
140d8f68 1687 * suspend by the host, using usb_port_resume(). It's also routine
1da177e4
LT		 1688 * to disconnect devices while they are suspended.
1689 *
390a8c34
DB		 1690 * This only affects the USB hardware for a device; its interfaces
1691 * (and, for hubs, child devices) must already have been suspended.
1692 *
1da177e4
LT		 1693 * Suspending OTG devices may trigger HNP, if that's been enabled
1694 * between a pair of dual-role devices. That will change roles, such
1695 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1696 *
1697 * Returns 0 on success, else negative errno.
1698 */
140d8f68 1699int usb_port_suspend(struct usb_device *udev)
1da177e4 1700{
140d8f68 1701 return __usb_port_suspend(udev, udev->portnum);
1da177e4 1702}
f3f3253d 1703
1da177e4 1704/*
390a8c34
DB		 1705 * If the USB "suspend" state is in use (rather than "global suspend"),
1706 * many devices will be individually taken out of suspend state using
1707 * special" resume" signaling. These routines kick in shortly after
1da177e4
LT		 1708 * hardware resume signaling is finished, either because of selective
1709 * resume (by host) or remote wakeup (by device) ... now see what changed
1710 * in the tree that's rooted at this device.
1711 */
140d8f68 1712static int finish_port_resume(struct usb_device *udev)
1da177e4
LT		 1713{
1714 int status;
1715 u16 devstatus;
1716
1717 /* caller owns the udev device lock */
f3f3253d 1718 dev_dbg(&udev->dev, "finish resume\n");
1da177e4
LT		 1719
1720 /* usb ch9 identifies four variants of SUSPENDED, based on what
1721 * state the device resumes to. Linux currently won't see the
1722 * first two on the host side; they'd be inside hub_port_init()
1723 * during many timeouts, but khubd can't suspend until later.
1724 */
1725 usb_set_device_state(udev, udev->actconfig
1726 ? USB_STATE_CONFIGURED
1727 : USB_STATE_ADDRESS);
1da177e4
LT		 1728
1729 /* 10.5.4.5 says be sure devices in the tree are still there.
1730 * For now let's assume the device didn't go crazy on resume,
1731 * and device drivers will know about any resume quirks.
1732 */
1733 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
b40b7a90
AS		 1734 if (status >= 0)
1735 status = (status == 2 ? 0 : -ENODEV);
1736
1737 if (status)
1da177e4
LT		 1738 dev_dbg(&udev->dev,
1739 "gone after usb resume? status %d\n",
1740 status);
1741 else if (udev->actconfig) {
1da177e4 1742 le16_to_cpus(&devstatus);
55c52718 1743 if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
f3f3253d 1744 && udev->parent) {
1da177e4
LT		 1745 status = usb_control_msg(udev,
1746 usb_sndctrlpipe(udev, 0),
1747 USB_REQ_CLEAR_FEATURE,
1748 USB_RECIP_DEVICE,
1749 USB_DEVICE_REMOTE_WAKEUP, 0,
1750 NULL, 0,
1751 USB_CTRL_SET_TIMEOUT);
a8e7c565 1752 if (status)
1da177e4
LT		 1753 dev_dbg(&udev->dev, "disable remote "
1754 "wakeup, status %d\n", status);
4bf0ba86 1755 }
1da177e4
LT		 1756 status = 0;
1757
1758 } else if (udev->devnum <= 0) {
1759 dev_dbg(&udev->dev, "bogus resume!\n");
1760 status = -EINVAL;
1761 }
1762 return status;
1763}
1764
1765static int
1766hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1767{
1768 int status;
d25450c6
AS		 1769 u16 portchange, portstatus;
1770
1771 /* Skip the initial Clear-Suspend step for a remote wakeup */
1772 status = hub_port_status(hub, port1, &portstatus, &portchange);
1773 if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
1774 goto SuspendCleared;
1da177e4
LT		 1775
1776 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1777
d5cbad4b
AS		 1778 set_bit(port1, hub->busy_bits);
1779
1da177e4
LT		 1780 /* see 7.1.7.7; affects power usage, but not budgeting */
1781 status = clear_port_feature(hub->hdev,
1782 port1, USB_PORT_FEAT_SUSPEND);
1783 if (status) {
1784 dev_dbg(hub->intfdev,
1785 "can't resume port %d, status %d\n",
1786 port1, status);
1787 } else {
1da177e4
LT		 1788 /* drive resume for at least 20 msec */
1789 if (udev)
645daaab
AS		 1790 dev_dbg(&udev->dev, "usb %sresume\n",
1791 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1792 msleep(25);
1793
1794#define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1795 | USB_PORT_STAT_ENABLE \
1796 | USB_PORT_STAT_CONNECTION)
1797
1798 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1799 * stop resume signaling. Then finish the resume
1800 * sequence.
1801 */
d25450c6
AS		 1802 status = hub_port_status(hub, port1, &portstatus, &portchange);
1803SuspendCleared:
1da177e4 1804 if (status < 0
d25450c6
AS		 1805 || (portstatus & LIVE_FLAGS) != LIVE_FLAGS
1806 || (portstatus & USB_PORT_STAT_SUSPEND) != 0
1da177e4
LT		 1807 ) {
1808 dev_dbg(hub->intfdev,
1809 "port %d status %04x.%04x after resume, %d\n",
d25450c6 1810 port1, portchange, portstatus, status);
20307949
AS		 1811 if (status >= 0)
1812 status = -ENODEV;
1da177e4 1813 } else {
20307949
AS		 1814 if (portchange & USB_PORT_STAT_C_SUSPEND)
1815 clear_port_feature(hub->hdev, port1,
1816 USB_PORT_FEAT_C_SUSPEND);
1da177e4
LT		 1817 /* TRSMRCY = 10 msec */
1818 msleep(10);
1819 if (udev)
140d8f68 1820 status = finish_port_resume(udev);
1da177e4
LT		 1821 }
1822 }
1823 if (status < 0)
1824 hub_port_logical_disconnect(hub, port1);
1825
d5cbad4b
AS		 1826 clear_bit(port1, hub->busy_bits);
1827 if (!hub->hdev->parent && !hub->busy_bits[0])
1828 usb_enable_root_hub_irq(hub->hdev->bus);
1829
1da177e4
LT		 1830 return status;
1831}
1832
5edbfb7c 1833/*
140d8f68 1834 * usb_port_resume - re-activate a suspended usb device's upstream port
1da177e4 1835 * @udev: device to re-activate
5edbfb7c 1836 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1837 *
1838 * This will re-activate the suspended device, increasing power usage
1839 * while letting drivers communicate again with its endpoints.
1840 * USB resume explicitly guarantees that the power session between
1841 * the host and the device is the same as it was when the device
1842 * suspended.
1843 *
1844 * Returns 0 on success, else negative errno.
1845 */
140d8f68 1846int usb_port_resume(struct usb_device *udev)
1da177e4 1847{
d388dab7 1848 int status;
1da177e4 1849
140d8f68
AS		 1850 /* we change the device's upstream USB link,
1851 * but root hubs have no upstream USB link.
1852 */
f3f3253d 1853 if (udev->parent) {
114b368c
AS		 1854 // NOTE this fails if parent is also suspended...
1855 status = hub_port_resume(hdev_to_hub(udev->parent),
1856 udev->portnum, udev);
645daaab
AS		 1857 } else {
1858 dev_dbg(&udev->dev, "usb %sresume\n",
1859 udev->auto_pm ? "auto-" : "");
140d8f68 1860 status = finish_port_resume(udev);
645daaab 1861 }
f3f3253d 1862 if (status < 0)
a8e7c565 1863 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
1da177e4
LT		 1864 return status;
1865}
1866
1867static int remote_wakeup(struct usb_device *udev)
1868{
1869 int status = 0;
1870
9ad3d6cc 1871 usb_lock_device(udev);
1da177e4 1872 if (udev->state == USB_STATE_SUSPENDED) {
645daaab 1873 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
1941044a 1874 usb_mark_last_busy(udev);
6b157c9b 1875 status = usb_external_resume_device(udev);
1da177e4 1876 }
9ad3d6cc 1877 usb_unlock_device(udev);
1da177e4
LT		 1878 return status;
1879}
1880
d388dab7
AS		 1881#else /* CONFIG_USB_SUSPEND */
1882
1883/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1884
1885int usb_port_suspend(struct usb_device *udev)
1886{
1887 return 0;
1888}
1889
1890static inline int
1891finish_port_resume(struct usb_device *udev)
1892{
1893 return 0;
1894}
1895
1896static inline int
1897hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1898{
1899 return 0;
1900}
1901
1902int usb_port_resume(struct usb_device *udev)
1903{
1904 return 0;
1905}
1906
1907static inline int remote_wakeup(struct usb_device *udev)
1908{
1909 return 0;
1910}
1911
1912#endif
1913
db690874 1914static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1da177e4
LT		 1915{
1916 struct usb_hub *hub = usb_get_intfdata (intf);
1917 struct usb_device *hdev = hub->hdev;
1918 unsigned port1;
12f1ff83 1919 int status = 0;
1da177e4 1920
c9f89fa4 1921 /* fail if children aren't already suspended */
1da177e4
LT		 1922 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1923 struct usb_device *udev;
1924
1925 udev = hdev->children [port1-1];
114b368c 1926 if (udev && msg.event == PM_EVENT_SUSPEND &&
f3f3253d 1927#ifdef CONFIG_USB_SUSPEND
114b368c
AS		 1928 udev->state != USB_STATE_SUSPENDED
1929#else
1930 udev->dev.power.power_state.event
1931 == PM_EVENT_ON
f3f3253d 1932#endif
114b368c 1933 ) {
645daaab
AS		 1934 if (!hdev->auto_pm)
1935 dev_dbg(&intf->dev, "port %d nyet suspended\n",
1936 port1);
c9f89fa4
DB		 1937 return -EBUSY;
1938 }
1da177e4
LT		 1939 }
1940
40f122f3
AS		 1941 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1942
12f1ff83
AS		 1943 /* stop khubd and related activity */
1944 hub_quiesce(hub);
1945
f3f3253d
DB		 1946 /* "global suspend" of the downstream HC-to-USB interface */
1947 if (!hdev->parent) {
12f1ff83
AS		 1948 status = hcd_bus_suspend(hdev->bus);
1949 if (status != 0) {
1950 dev_dbg(&hdev->dev, "'global' suspend %d\n", status);
1951 hub_activate(hub);
1952 }
f3f3253d 1953 }
12f1ff83 1954 return status;
1da177e4
LT		 1955}
1956
1957static int hub_resume(struct usb_interface *intf)
1958{
1da177e4 1959 struct usb_hub *hub = usb_get_intfdata (intf);
40f122f3 1960 struct usb_device *hdev = hub->hdev;
1da177e4
LT		 1961 int status;
1962
40f122f3
AS		 1963 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1964
f3f3253d
DB		 1965 /* "global resume" of the downstream HC-to-USB interface */
1966 if (!hdev->parent) {
1967 struct usb_bus *bus = hdev->bus;
0c0382e3
AS		 1968 if (bus) {
1969 status = hcd_bus_resume (bus);
f3f3253d
DB		 1970 if (status) {
1971 dev_dbg(&intf->dev, "'global' resume %d\n",
1972 status);
1973 return status;
1974 }
1975 } else
1976 return -EOPNOTSUPP;
1977 if (status == 0) {
1978 /* TRSMRCY = 10 msec */
1979 msleep(10);
1980 }
1981 }
1982
a8e7c565 1983 /* tell khubd to look for changes on this hub */
f3f3253d 1984 hub_activate(hub);
1da177e4
LT		 1985 return 0;
1986}
1987
d388dab7
AS		 1988#else /* CONFIG_PM */
1989
1990static inline int remote_wakeup(struct usb_device *udev)
1991{
1992 return 0;
1993}
1994
511366da
AM		 1995#define hub_suspend NULL
1996#define hub_resume NULL
d388dab7
AS		 1997#endif
1998
1da177e4
LT		 1999
2000/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2001 *
2002 * Between connect detection and reset signaling there must be a delay
2003 * of 100ms at least for debounce and power-settling. The corresponding
2004 * timer shall restart whenever the downstream port detects a disconnect.
2005 *
2006 * Apparently there are some bluetooth and irda-dongles and a number of
2007 * low-speed devices for which this debounce period may last over a second.
2008 * Not covered by the spec - but easy to deal with.
2009 *
2010 * This implementation uses a 1500ms total debounce timeout; if the
2011 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2012 * every 25ms for transient disconnects. When the port status has been
2013 * unchanged for 100ms it returns the port status.
2014 */
2015
2016#define HUB_DEBOUNCE_TIMEOUT 1500
2017#define HUB_DEBOUNCE_STEP 25
2018#define HUB_DEBOUNCE_STABLE 100
2019
2020static int hub_port_debounce(struct usb_hub *hub, int port1)
2021{
2022 int ret;
2023 int total_time, stable_time = 0;
2024 u16 portchange, portstatus;
2025 unsigned connection = 0xffff;
2026
2027 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2028 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2029 if (ret < 0)
2030 return ret;
2031
2032 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2033 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2034 stable_time += HUB_DEBOUNCE_STEP;
2035 if (stable_time >= HUB_DEBOUNCE_STABLE)
2036 break;
2037 } else {
2038 stable_time = 0;
2039 connection = portstatus & USB_PORT_STAT_CONNECTION;
2040 }
2041
2042 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2043 clear_port_feature(hub->hdev, port1,
2044 USB_PORT_FEAT_C_CONNECTION);
2045 }
2046
2047 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2048 break;
2049 msleep(HUB_DEBOUNCE_STEP);
2050 }
2051
2052 dev_dbg (hub->intfdev,
2053 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2054 port1, total_time, stable_time, portstatus);
2055
2056 if (stable_time < HUB_DEBOUNCE_STABLE)
2057 return -ETIMEDOUT;
2058 return portstatus;
2059}
2060
2061static void ep0_reinit(struct usb_device *udev)
2062{
2063 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2064 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2065 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2066}
2067
2068#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2069#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2070
2071static int hub_set_address(struct usb_device *udev)
2072{
2073 int retval;
2074
2075 if (udev->devnum == 0)
2076 return -EINVAL;
2077 if (udev->state == USB_STATE_ADDRESS)
2078 return 0;
2079 if (udev->state != USB_STATE_DEFAULT)
2080 return -EINVAL;
2081 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2082 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2083 NULL, 0, USB_CTRL_SET_TIMEOUT);
2084 if (retval == 0) {
2085 usb_set_device_state(udev, USB_STATE_ADDRESS);
2086 ep0_reinit(udev);
2087 }
2088 return retval;
2089}
2090
2091/* Reset device, (re)assign address, get device descriptor.
2092 * Device connection must be stable, no more debouncing needed.
2093 * Returns device in USB_STATE_ADDRESS, except on error.
2094 *
2095 * If this is called for an already-existing device (as part of
2096 * usb_reset_device), the caller must own the device lock. For a
2097 * newly detected device that is not accessible through any global
2098 * pointers, it's not necessary to lock the device.
2099 */
2100static int
2101hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2102 int retry_counter)
2103{
4186ecf8 2104 static DEFINE_MUTEX(usb_address0_mutex);
1da177e4
LT		 2105
2106 struct usb_device *hdev = hub->hdev;
2107 int i, j, retval;
2108 unsigned delay = HUB_SHORT_RESET_TIME;
2109 enum usb_device_speed oldspeed = udev->speed;
83a07196 2110 char *speed, *type;
1da177e4
LT		 2111
2112 /* root hub ports have a slightly longer reset period
2113 * (from USB 2.0 spec, section 7.1.7.5)
2114 */
2115 if (!hdev->parent) {
2116 delay = HUB_ROOT_RESET_TIME;
2117 if (port1 == hdev->bus->otg_port)
2118 hdev->bus->b_hnp_enable = 0;
2119 }
2120
2121 /* Some low speed devices have problems with the quick delay, so */
2122 /* be a bit pessimistic with those devices. RHbug #23670 */
2123 if (oldspeed == USB_SPEED_LOW)
2124 delay = HUB_LONG_RESET_TIME;
2125
4186ecf8 2126 mutex_lock(&usb_address0_mutex);
1da177e4
LT		 2127
2128 /* Reset the device; full speed may morph to high speed */
2129 retval = hub_port_reset(hub, port1, udev, delay);
2130 if (retval < 0) /* error or disconnect */
2131 goto fail;
2132 /* success, speed is known */
2133 retval = -ENODEV;
2134
2135 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2136 dev_dbg(&udev->dev, "device reset changed speed!\n");
2137 goto fail;
2138 }
2139 oldspeed = udev->speed;
2140
2141 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2142 * it's fixed size except for full speed devices.
5bb6e0ae
IPG		 2143 * For Wireless USB devices, ep0 max packet is always 512 (tho
2144 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
1da177e4
LT		 2145 */
2146 switch (udev->speed) {
5bb6e0ae
IPG		 2147 case USB_SPEED_VARIABLE: /* fixed at 512 */
2148 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
2149 break;
1da177e4
LT		 2150 case USB_SPEED_HIGH: /* fixed at 64 */
2151 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2152 break;
2153 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2154 /* to determine the ep0 maxpacket size, try to read
2155 * the device descriptor to get bMaxPacketSize0 and
2156 * then correct our initial guess.
2157 */
2158 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2159 break;
2160 case USB_SPEED_LOW: /* fixed at 8 */
2161 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2162 break;
2163 default:
2164 goto fail;
2165 }
2166
83a07196
IPG		 2167 type = "";
2168 switch (udev->speed) {
2169 case USB_SPEED_LOW: speed = "low"; break;
2170 case USB_SPEED_FULL: speed = "full"; break;
2171 case USB_SPEED_HIGH: speed = "high"; break;
2172 case USB_SPEED_VARIABLE:
2173 speed = "variable";
2174 type = "Wireless ";
2175 break;
2176 default: speed = "?"; break;
2177 }
1da177e4 2178 dev_info (&udev->dev,
83a07196
IPG		 2179 "%s %s speed %sUSB device using %s and address %d\n",
2180 (udev->config) ? "reset" : "new", speed, type,
2181 udev->bus->controller->driver->name, udev->devnum);
1da177e4
LT		 2182
2183 /* Set up TT records, if needed */
2184 if (hdev->tt) {
2185 udev->tt = hdev->tt;
2186 udev->ttport = hdev->ttport;
2187 } else if (udev->speed != USB_SPEED_HIGH
2188 && hdev->speed == USB_SPEED_HIGH) {
2189 udev->tt = &hub->tt;
2190 udev->ttport = port1;
2191 }
2192
2193 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2194 * Because device hardware and firmware is sometimes buggy in
2195 * this area, and this is how Linux has done it for ages.
2196 * Change it cautiously.
2197 *
2198 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2199 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2200 * so it may help with some non-standards-compliant devices.
2201 * Otherwise we start with SET_ADDRESS and then try to read the
2202 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2203 * value.
2204 */
2205 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2206 if (USE_NEW_SCHEME(retry_counter)) {
2207 struct usb_device_descriptor *buf;
2208 int r = 0;
2209
2210#define GET_DESCRIPTOR_BUFSIZE 64
2211 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2212 if (!buf) {
2213 retval = -ENOMEM;
2214 continue;
2215 }
2216
b89ee19a
AS		 2217 /* Retry on all errors; some devices are flakey.
2218 * 255 is for WUSB devices, we actually need to use
2219 * 512 (WUSB1.0[4.8.1]).
1da177e4
LT		 2220 */
2221 for (j = 0; j < 3; ++j) {
2222 buf->bMaxPacketSize0 = 0;
2223 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2224 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2225 USB_DT_DEVICE << 8, 0,
2226 buf, GET_DESCRIPTOR_BUFSIZE,
b89ee19a 2227 USB_CTRL_GET_TIMEOUT);
1da177e4 2228 switch (buf->bMaxPacketSize0) {
5bb6e0ae 2229 case 8: case 16: case 32: case 64: case 255:
1da177e4
LT		 2230 if (buf->bDescriptorType ==
2231 USB_DT_DEVICE) {
2232 r = 0;
2233 break;
2234 }
2235 /* FALL THROUGH */
2236 default:
2237 if (r == 0)
2238 r = -EPROTO;
2239 break;
2240 }
2241 if (r == 0)
2242 break;
2243 }
2244 udev->descriptor.bMaxPacketSize0 =
2245 buf->bMaxPacketSize0;
2246 kfree(buf);
2247
2248 retval = hub_port_reset(hub, port1, udev, delay);
2249 if (retval < 0) /* error or disconnect */
2250 goto fail;
2251 if (oldspeed != udev->speed) {
2252 dev_dbg(&udev->dev,
2253 "device reset changed speed!\n");
2254 retval = -ENODEV;
2255 goto fail;
2256 }
2257 if (r) {
2258 dev_err(&udev->dev, "device descriptor "
2259 "read/%s, error %d\n",
2260 "64", r);
2261 retval = -EMSGSIZE;
2262 continue;
2263 }
2264#undef GET_DESCRIPTOR_BUFSIZE
2265 }
2266
2267 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2268 retval = hub_set_address(udev);
2269 if (retval >= 0)
2270 break;
2271 msleep(200);
2272 }
2273 if (retval < 0) {
2274 dev_err(&udev->dev,
2275 "device not accepting address %d, error %d\n",
2276 udev->devnum, retval);
2277 goto fail;
2278 }
2279
2280 /* cope with hardware quirkiness:
2281 * - let SET_ADDRESS settle, some device hardware wants it
2282 * - read ep0 maxpacket even for high and low speed,
2283 */
2284 msleep(10);
2285 if (USE_NEW_SCHEME(retry_counter))
2286 break;
2287
2288 retval = usb_get_device_descriptor(udev, 8);
2289 if (retval < 8) {
2290 dev_err(&udev->dev, "device descriptor "
2291 "read/%s, error %d\n",
2292 "8", retval);
2293 if (retval >= 0)
2294 retval = -EMSGSIZE;
2295 } else {
2296 retval = 0;
2297 break;
2298 }
2299 }
2300 if (retval)
2301 goto fail;
2302
5bb6e0ae
IPG		 2303 i = udev->descriptor.bMaxPacketSize0 == 0xff?
2304 512 : udev->descriptor.bMaxPacketSize0;
1da177e4
LT		 2305 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2306 if (udev->speed != USB_SPEED_FULL ||
2307 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2308 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2309 retval = -EMSGSIZE;
2310 goto fail;
2311 }
2312 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2313 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2314 ep0_reinit(udev);
2315 }
2316
2317 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2318 if (retval < (signed)sizeof(udev->descriptor)) {
2319 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2320 "all", retval);
2321 if (retval >= 0)
2322 retval = -ENOMSG;
2323 goto fail;
2324 }
2325
2326 retval = 0;
2327
2328fail:
2329 if (retval)
2330 hub_port_disable(hub, port1, 0);
4186ecf8 2331 mutex_unlock(&usb_address0_mutex);
1da177e4
LT		 2332 return retval;
2333}
2334
2335static void
2336check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2337{
2338 struct usb_qualifier_descriptor *qual;
2339 int status;
2340
e94b1766 2341 qual = kmalloc (sizeof *qual, GFP_KERNEL);
1da177e4
LT		 2342 if (qual == NULL)
2343 return;
2344
2345 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2346 qual, sizeof *qual);
2347 if (status == sizeof *qual) {
2348 dev_info(&udev->dev, "not running at top speed; "
2349 "connect to a high speed hub\n");
2350 /* hub LEDs are probably harder to miss than syslog */
2351 if (hub->has_indicators) {
2352 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
c4028958 2353 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2354 }
2355 }
1bc3c9e1 2356 kfree(qual);
1da177e4
LT		 2357}
2358
2359static unsigned
2360hub_power_remaining (struct usb_hub *hub)
2361{
2362 struct usb_device *hdev = hub->hdev;
2363 int remaining;
55c52718 2364 int port1;
1da177e4 2365
55c52718 2366 if (!hub->limited_power)
1da177e4
LT		 2367 return 0;
2368
55c52718
AS		 2369 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2370 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2371 struct usb_device *udev = hdev->children[port1 - 1];
2372 int delta;
1da177e4
LT		 2373
2374 if (!udev)
2375 continue;
2376
55c52718
AS		 2377 /* Unconfigured devices may not use more than 100mA,
2378 * or 8mA for OTG ports */
1da177e4 2379 if (udev->actconfig)
55c52718
AS		 2380 delta = udev->actconfig->desc.bMaxPower * 2;
2381 else if (port1 != udev->bus->otg_port || hdev->parent)
2382 delta = 100;
1da177e4 2383 else
55c52718
AS		 2384 delta = 8;
2385 if (delta > hub->mA_per_port)
2386 dev_warn(&udev->dev, "%dmA is over %umA budget "
2387 "for port %d!\n",
2388 delta, hub->mA_per_port, port1);
1da177e4
LT		 2389 remaining -= delta;
2390 }
2391 if (remaining < 0) {
55c52718
AS		 2392 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2393 - remaining);
1da177e4
LT		 2394 remaining = 0;
2395 }
2396 return remaining;
2397}
2398
2399/* Handle physical or logical connection change events.
2400 * This routine is called when:
2401 * a port connection-change occurs;
2402 * a port enable-change occurs (often caused by EMI);
2403 * usb_reset_device() encounters changed descriptors (as from
2404 * a firmware download)
2405 * caller already locked the hub
2406 */
2407static void hub_port_connect_change(struct usb_hub *hub, int port1,
2408 u16 portstatus, u16 portchange)
2409{
2410 struct usb_device *hdev = hub->hdev;
2411 struct device *hub_dev = hub->intfdev;
74ad9bd2 2412 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4
LT		 2413 int status, i;
2414
2415 dev_dbg (hub_dev,
2416 "port %d, status %04x, change %04x, %s\n",
2417 port1, portstatus, portchange, portspeed (portstatus));
2418
2419 if (hub->has_indicators) {
2420 set_port_led(hub, port1, HUB_LED_AUTO);
2421 hub->indicator[port1-1] = INDICATOR_AUTO;
2422 }
2423
2424 /* Disconnect any existing devices under this port */
2425 if (hdev->children[port1-1])
2426 usb_disconnect(&hdev->children[port1-1]);
2427 clear_bit(port1, hub->change_bits);
2428
2429#ifdef CONFIG_USB_OTG
2430 /* during HNP, don't repeat the debounce */
2431 if (hdev->bus->is_b_host)
2432 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2433#endif
2434
2435 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2436 status = hub_port_debounce(hub, port1);
d4b7d8e8
AS		 2437 if (status < 0) {
2438 if (printk_ratelimit())
2439 dev_err (hub_dev, "connect-debounce failed, "
2440 "port %d disabled\n", port1);
1da177e4
LT		 2441 goto done;
2442 }
2443 portstatus = status;
2444 }
2445
2446 /* Return now if nothing is connected */
2447 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2448
2449 /* maybe switch power back on (e.g. root hub was reset) */
74ad9bd2 2450 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
1da177e4
LT		 2451 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2452 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2453
2454 if (portstatus & USB_PORT_STAT_ENABLE)
2455 goto done;
2456 return;
2457 }
2458
2459#ifdef CONFIG_USB_SUSPEND
2460 /* If something is connected, but the port is suspended, wake it up. */
2461 if (portstatus & USB_PORT_STAT_SUSPEND) {
2462 status = hub_port_resume(hub, port1, NULL);
2463 if (status < 0) {
2464 dev_dbg(hub_dev,
2465 "can't clear suspend on port %d; %d\n",
2466 port1, status);
2467 goto done;
2468 }
2469 }
2470#endif
2471
2472 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2473 struct usb_device *udev;
2474
2475 /* reallocate for each attempt, since references
2476 * to the previous one can escape in various ways
2477 */
2478 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2479 if (!udev) {
2480 dev_err (hub_dev,
2481 "couldn't allocate port %d usb_device\n",
2482 port1);
2483 goto done;
2484 }
2485
2486 usb_set_device_state(udev, USB_STATE_POWERED);
2487 udev->speed = USB_SPEED_UNKNOWN;
55c52718 2488 udev->bus_mA = hub->mA_per_port;
b6956ffa 2489 udev->level = hdev->level + 1;
55c52718 2490
1da177e4
LT		 2491 /* set the address */
2492 choose_address(udev);
2493 if (udev->devnum <= 0) {
2494 status = -ENOTCONN; /* Don't retry */
2495 goto loop;
2496 }
2497
2498 /* reset and get descriptor */
2499 status = hub_port_init(hub, udev, port1, i);
2500 if (status < 0)
2501 goto loop;
2502
2503 /* consecutive bus-powered hubs aren't reliable; they can
2504 * violate the voltage drop budget. if the new child has
2505 * a "powered" LED, users should notice we didn't enable it
2506 * (without reading syslog), even without per-port LEDs
2507 * on the parent.
2508 */
2509 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
55c52718 2510 && udev->bus_mA <= 100) {
1da177e4
LT		 2511 u16 devstat;
2512
2513 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2514 &devstat);
55c52718 2515 if (status < 2) {
1da177e4
LT		 2516 dev_dbg(&udev->dev, "get status %d ?\n", status);
2517 goto loop_disable;
2518 }
55c52718 2519 le16_to_cpus(&devstat);
1da177e4
LT		 2520 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2521 dev_err(&udev->dev,
2522 "can't connect bus-powered hub "
2523 "to this port\n");
2524 if (hub->has_indicators) {
2525 hub->indicator[port1-1] =
2526 INDICATOR_AMBER_BLINK;
c4028958 2527 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2528 }
2529 status = -ENOTCONN; /* Don't retry */
2530 goto loop_disable;
2531 }
2532 }
2533
2534 /* check for devices running slower than they could */
2535 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2536 && udev->speed == USB_SPEED_FULL
2537 && highspeed_hubs != 0)
2538 check_highspeed (hub, udev, port1);
2539
2540 /* Store the parent's children[] pointer. At this point
2541 * udev becomes globally accessible, although presumably
2542 * no one will look at it until hdev is unlocked.
2543 */
1da177e4
LT		 2544 status = 0;
2545
2546 /* We mustn't add new devices if the parent hub has
2547 * been disconnected; we would race with the
2548 * recursively_mark_NOTATTACHED() routine.
2549 */
2550 spin_lock_irq(&device_state_lock);
2551 if (hdev->state == USB_STATE_NOTATTACHED)
2552 status = -ENOTCONN;
2553 else
2554 hdev->children[port1-1] = udev;
2555 spin_unlock_irq(&device_state_lock);
2556
2557 /* Run it through the hoops (find a driver, etc) */
2558 if (!status) {
2559 status = usb_new_device(udev);
2560 if (status) {
2561 spin_lock_irq(&device_state_lock);
2562 hdev->children[port1-1] = NULL;
2563 spin_unlock_irq(&device_state_lock);
2564 }
2565 }
2566
1da177e4
LT		 2567 if (status)
2568 goto loop_disable;
2569
2570 status = hub_power_remaining(hub);
2571 if (status)
55c52718 2572 dev_dbg(hub_dev, "%dmA power budget left\n", status);
1da177e4
LT		 2573
2574 return;
2575
2576loop_disable:
2577 hub_port_disable(hub, port1, 1);
2578loop:
2579 ep0_reinit(udev);
2580 release_address(udev);
2581 usb_put_dev(udev);
2582 if (status == -ENOTCONN)
2583 break;
2584 }
2585
2586done:
2587 hub_port_disable(hub, port1, 1);
2588}
2589
2590static void hub_events(void)
2591{
2592 struct list_head *tmp;
2593 struct usb_device *hdev;
2594 struct usb_interface *intf;
2595 struct usb_hub *hub;
2596 struct device *hub_dev;
2597 u16 hubstatus;
2598 u16 hubchange;
2599 u16 portstatus;
2600 u16 portchange;
2601 int i, ret;
2602 int connect_change;
2603
2604 /*
2605 * We restart the list every time to avoid a deadlock with
2606 * deleting hubs downstream from this one. This should be
2607 * safe since we delete the hub from the event list.
2608 * Not the most efficient, but avoids deadlocks.
2609 */
2610 while (1) {
2611
2612 /* Grab the first entry at the beginning of the list */
2613 spin_lock_irq(&hub_event_lock);
2614 if (list_empty(&hub_event_list)) {
2615 spin_unlock_irq(&hub_event_lock);
2616 break;
2617 }
2618
2619 tmp = hub_event_list.next;
2620 list_del_init(tmp);
2621
2622 hub = list_entry(tmp, struct usb_hub, event_list);
2623 hdev = hub->hdev;
2624 intf = to_usb_interface(hub->intfdev);
2625 hub_dev = &intf->dev;
2626
40f122f3 2627 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
1da177e4
LT		 2628 hdev->state, hub->descriptor
2629 ? hub->descriptor->bNbrPorts
2630 : 0,
2631 /* NOTE: expects max 15 ports... */
2632 (u16) hub->change_bits[0],
40f122f3 2633 (u16) hub->event_bits[0]);
1da177e4
LT		 2634
2635 usb_get_intf(intf);
1da177e4
LT		 2636 spin_unlock_irq(&hub_event_lock);
2637
1da177e4
LT		 2638 /* Lock the device, then check to see if we were
2639 * disconnected while waiting for the lock to succeed. */
2640 if (locktree(hdev) < 0) {
2641 usb_put_intf(intf);
2642 continue;
2643 }
2644 if (hub != usb_get_intfdata(intf))
2645 goto loop;
2646
2647 /* If the hub has died, clean up after it */
2648 if (hdev->state == USB_STATE_NOTATTACHED) {
7de18d8b
AS		 2649 hub->error = -ENODEV;
2650 hub_pre_reset(intf);
1da177e4
LT		 2651 goto loop;
2652 }
2653
40f122f3
AS		 2654 /* Autoresume */
2655 ret = usb_autopm_get_interface(intf);
2656 if (ret) {
2657 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
2658 goto loop;
2659 }
a8e7c565 2660
40f122f3 2661 /* If this is an inactive hub, do nothing */
1da177e4 2662 if (hub->quiescing)
40f122f3 2663 goto loop_autopm;
1da177e4
LT		 2664
2665 if (hub->error) {
2666 dev_dbg (hub_dev, "resetting for error %d\n",
2667 hub->error);
2668
7de18d8b 2669 ret = usb_reset_composite_device(hdev, intf);
1da177e4
LT		 2670 if (ret) {
2671 dev_dbg (hub_dev,
2672 "error resetting hub: %d\n", ret);
40f122f3 2673 goto loop_autopm;
1da177e4
LT		 2674 }
2675
2676 hub->nerrors = 0;
2677 hub->error = 0;
2678 }
2679
2680 /* deal with port status changes */
2681 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2682 if (test_bit(i, hub->busy_bits))
2683 continue;
2684 connect_change = test_bit(i, hub->change_bits);
2685 if (!test_and_clear_bit(i, hub->event_bits) &&
2686 !connect_change && !hub->activating)
2687 continue;
2688
2689 ret = hub_port_status(hub, i,
2690 &portstatus, &portchange);
2691 if (ret < 0)
2692 continue;
2693
2694 if (hub->activating && !hdev->children[i-1] &&
2695 (portstatus &
2696 USB_PORT_STAT_CONNECTION))
2697 connect_change = 1;
2698
2699 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2700 clear_port_feature(hdev, i,
2701 USB_PORT_FEAT_C_CONNECTION);
2702 connect_change = 1;
2703 }
2704
2705 if (portchange & USB_PORT_STAT_C_ENABLE) {
2706 if (!connect_change)
2707 dev_dbg (hub_dev,
2708 "port %d enable change, "
2709 "status %08x\n",
2710 i, portstatus);
2711 clear_port_feature(hdev, i,
2712 USB_PORT_FEAT_C_ENABLE);
2713
2714 /*
2715 * EM interference sometimes causes badly
2716 * shielded USB devices to be shutdown by
2717 * the hub, this hack enables them again.
2718 * Works at least with mouse driver.
2719 */
2720 if (!(portstatus & USB_PORT_STAT_ENABLE)
2721 && !connect_change
2722 && hdev->children[i-1]) {
2723 dev_err (hub_dev,
2724 "port %i "
2725 "disabled by hub (EMI?), "
2726 "re-enabling...\n",
2727 i);
2728 connect_change = 1;
2729 }
2730 }
2731
2732 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2733 clear_port_feature(hdev, i,
2734 USB_PORT_FEAT_C_SUSPEND);
2735 if (hdev->children[i-1]) {
2736 ret = remote_wakeup(hdev->
2737 children[i-1]);
2738 if (ret < 0)
2739 connect_change = 1;
2740 } else {
2741 ret = -ENODEV;
2742 hub_port_disable(hub, i, 1);
2743 }
2744 dev_dbg (hub_dev,
2745 "resume on port %d, status %d\n",
2746 i, ret);
2747 }
2748
2749 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2750 dev_err (hub_dev,
2751 "over-current change on port %d\n",
2752 i);
2753 clear_port_feature(hdev, i,
2754 USB_PORT_FEAT_C_OVER_CURRENT);
2755 hub_power_on(hub);
2756 }
2757
2758 if (portchange & USB_PORT_STAT_C_RESET) {
2759 dev_dbg (hub_dev,
2760 "reset change on port %d\n",
2761 i);
2762 clear_port_feature(hdev, i,
2763 USB_PORT_FEAT_C_RESET);
2764 }
2765
2766 if (connect_change)
2767 hub_port_connect_change(hub, i,
2768 portstatus, portchange);
2769 } /* end for i */
2770
2771 /* deal with hub status changes */
2772 if (test_and_clear_bit(0, hub->event_bits) == 0)
2773 ; /* do nothing */
2774 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2775 dev_err (hub_dev, "get_hub_status failed\n");
2776 else {
2777 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2778 dev_dbg (hub_dev, "power change\n");
2779 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
55c52718
AS		 2780 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2781 /* FIXME: Is this always true? */
2782 hub->limited_power = 0;
2783 else
2784 hub->limited_power = 1;
1da177e4
LT		 2785 }
2786 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2787 dev_dbg (hub_dev, "overcurrent change\n");
2788 msleep(500); /* Cool down */
2789 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2790 hub_power_on(hub);
2791 }
2792 }
2793
2794 hub->activating = 0;
2795
d5926ae7
AS		 2796 /* If this is a root hub, tell the HCD it's okay to
2797 * re-enable port-change interrupts now. */
d5cbad4b 2798 if (!hdev->parent && !hub->busy_bits[0])
d5926ae7
AS		 2799 usb_enable_root_hub_irq(hdev->bus);
2800
40f122f3
AS		 2801loop_autopm:
2802 /* Allow autosuspend if we're not going to run again */
2803 if (list_empty(&hub->event_list))
2804 usb_autopm_enable(intf);
1da177e4
LT		 2805loop:
2806 usb_unlock_device(hdev);
2807 usb_put_intf(intf);
2808
2809 } /* end while (1) */
2810}
2811
2812static int hub_thread(void *__unused)
2813{
1da177e4
LT		 2814 do {
2815 hub_events();
9c8d6178
AM		 2816 wait_event_interruptible(khubd_wait,
2817 !list_empty(&hub_event_list) ||
2818 kthread_should_stop());
3e1d1d28 2819 try_to_freeze();
9c8d6178 2820 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
1da177e4 2821
9c8d6178
AM		 2822 pr_debug("%s: khubd exiting\n", usbcore_name);
2823 return 0;
1da177e4
LT		 2824}
2825
2826static struct usb_device_id hub_id_table [] = {
2827 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2828 .bDeviceClass = USB_CLASS_HUB},
2829 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2830 .bInterfaceClass = USB_CLASS_HUB},
2831 { } /* Terminating entry */
2832};
2833
2834MODULE_DEVICE_TABLE (usb, hub_id_table);
2835
2836static struct usb_driver hub_driver = {
1da177e4
LT		 2837 .name = "hub",
2838 .probe = hub_probe,
2839 .disconnect = hub_disconnect,
2840 .suspend = hub_suspend,
2841 .resume = hub_resume,
7de18d8b
AS		 2842 .pre_reset = hub_pre_reset,
2843 .post_reset = hub_post_reset,
1da177e4
LT		 2844 .ioctl = hub_ioctl,
2845 .id_table = hub_id_table,
40f122f3 2846 .supports_autosuspend = 1,
1da177e4
LT		 2847};
2848
2849int usb_hub_init(void)
2850{
1da177e4
LT		 2851 if (usb_register(&hub_driver) < 0) {
2852 printk(KERN_ERR "%s: can't register hub driver\n",
2853 usbcore_name);
2854 return -1;
2855 }
2856
9c8d6178
AM		 2857 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2858 if (!IS_ERR(khubd_task))
1da177e4 2859 return 0;
1da177e4
LT		 2860
2861 /* Fall through if kernel_thread failed */
2862 usb_deregister(&hub_driver);
2863 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2864
2865 return -1;
2866}
2867
2868void usb_hub_cleanup(void)
2869{
9c8d6178 2870 kthread_stop(khubd_task);
1da177e4
LT		 2871
2872 /*
2873 * Hub resources are freed for us by usb_deregister. It calls
2874 * usb_driver_purge on every device which in turn calls that
2875 * devices disconnect function if it is using this driver.
2876 * The hub_disconnect function takes care of releasing the
2877 * individual hub resources. -greg
2878 */
2879 usb_deregister(&hub_driver);
2880} /* usb_hub_cleanup() */
2881
1da177e4
LT		 2882static int config_descriptors_changed(struct usb_device *udev)
2883{
2884 unsigned index;
2885 unsigned len = 0;
2886 struct usb_config_descriptor *buf;
2887
2888 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2889 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2890 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2891 }
e94b1766 2892 buf = kmalloc (len, GFP_KERNEL);
1da177e4
LT		 2893 if (buf == NULL) {
2894 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2895 /* assume the worst */
2896 return 1;
2897 }
2898 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2899 int length;
2900 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2901
2902 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2903 old_length);
2904 if (length < old_length) {
2905 dev_dbg(&udev->dev, "config index %d, error %d\n",
2906 index, length);
2907 break;
2908 }
2909 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2910 != 0) {
2911 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2912 index, buf->bConfigurationValue);
2913 break;
2914 }
2915 }
2916 kfree(buf);
2917 return index != udev->descriptor.bNumConfigurations;
2918}
2919
2920/**
2921 * usb_reset_device - perform a USB port reset to reinitialize a device
2922 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2923 *
79efa097
AS		 2924 * WARNING - don't use this routine to reset a composite device
2925 * (one with multiple interfaces owned by separate drivers)!
2926 * Use usb_reset_composite_device() instead.
1da177e4
LT		 2927 *
2928 * Do a port reset, reassign the device's address, and establish its
2929 * former operating configuration. If the reset fails, or the device's
2930 * descriptors change from their values before the reset, or the original
2931 * configuration and altsettings cannot be restored, a flag will be set
2932 * telling khubd to pretend the device has been disconnected and then
2933 * re-connected. All drivers will be unbound, and the device will be
2934 * re-enumerated and probed all over again.
2935 *
2936 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2937 * flagged for logical disconnection, or some other negative error code
2938 * if the reset wasn't even attempted.
2939 *
2940 * The caller must own the device lock. For example, it's safe to use
2941 * this from a driver probe() routine after downloading new firmware.
2942 * For calls that might not occur during probe(), drivers should lock
2943 * the device using usb_lock_device_for_reset().
2944 */
2945int usb_reset_device(struct usb_device *udev)
2946{
2947 struct usb_device *parent_hdev = udev->parent;
2948 struct usb_hub *parent_hub;
2949 struct usb_device_descriptor descriptor = udev->descriptor;
12c3da34
AS		 2950 int i, ret = 0;
2951 int port1 = udev->portnum;
1da177e4
LT		 2952
2953 if (udev->state == USB_STATE_NOTATTACHED ||
2954 udev->state == USB_STATE_SUSPENDED) {
2955 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2956 udev->state);
2957 return -EINVAL;
2958 }
2959
2960 if (!parent_hdev) {
2961 /* this requires hcd-specific logic; see OHCI hc_restart() */
2962 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2963 return -EISDIR;
2964 }
1da177e4
LT		 2965 parent_hub = hdev_to_hub(parent_hdev);
2966
1da177e4
LT		 2967 set_bit(port1, parent_hub->busy_bits);
2968 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2969
2970 /* ep0 maxpacket size may change; let the HCD know about it.
2971 * Other endpoints will be handled by re-enumeration. */
2972 ep0_reinit(udev);
2973 ret = hub_port_init(parent_hub, udev, port1, i);
2974 if (ret >= 0)
2975 break;
2976 }
2977 clear_bit(port1, parent_hub->busy_bits);
d5cbad4b
AS		 2978 if (!parent_hdev->parent && !parent_hub->busy_bits[0])
2979 usb_enable_root_hub_irq(parent_hdev->bus);
2980
1da177e4
LT		 2981 if (ret < 0)
2982 goto re_enumerate;
2983
2984 /* Device might have changed firmware (DFU or similar) */
2985 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
2986 || config_descriptors_changed (udev)) {
2987 dev_info(&udev->dev, "device firmware changed\n");
2988 udev->descriptor = descriptor; /* for disconnect() calls */
2989 goto re_enumerate;
2990 }
2991
2992 if (!udev->actconfig)
2993 goto done;
2994
2995 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2996 USB_REQ_SET_CONFIGURATION, 0,
2997 udev->actconfig->desc.bConfigurationValue, 0,
2998 NULL, 0, USB_CTRL_SET_TIMEOUT);
2999 if (ret < 0) {
3000 dev_err(&udev->dev,
3001 "can't restore configuration #%d (error=%d)\n",
3002 udev->actconfig->desc.bConfigurationValue, ret);
3003 goto re_enumerate;
3004 }
3005 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3006
3007 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3008 struct usb_interface *intf = udev->actconfig->interface[i];
3009 struct usb_interface_descriptor *desc;
3010
3011 /* set_interface resets host side toggle even
3012 * for altsetting zero. the interface may have no driver.
3013 */
3014 desc = &intf->cur_altsetting->desc;
3015 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3016 desc->bAlternateSetting);
3017 if (ret < 0) {
3018 dev_err(&udev->dev, "failed to restore interface %d "
3019 "altsetting %d (error=%d)\n",
3020 desc->bInterfaceNumber,
3021 desc->bAlternateSetting,
3022 ret);
3023 goto re_enumerate;
3024 }
3025 }
3026
3027done:
1da177e4
LT		 3028 return 0;
3029
3030re_enumerate:
3031 hub_port_logical_disconnect(parent_hub, port1);
3032 return -ENODEV;
3033}
140d8f68 3034EXPORT_SYMBOL(usb_reset_device);
79efa097
AS		 3035
3036/**
3037 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3038 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3039 * @iface: interface bound to the driver making the request (optional)
3040 *
3041 * Warns all drivers bound to registered interfaces (using their pre_reset
3042 * method), performs the port reset, and then lets the drivers know that
3043 * the reset is over (using their post_reset method).
3044 *
3045 * Return value is the same as for usb_reset_device().
3046 *
3047 * The caller must own the device lock. For example, it's safe to use
3048 * this from a driver probe() routine after downloading new firmware.
3049 * For calls that might not occur during probe(), drivers should lock
3050 * the device using usb_lock_device_for_reset().
3051 *
3052 * The interface locks are acquired during the pre_reset stage and released
3053 * during the post_reset stage. However if iface is not NULL and is
3054 * currently being probed, we assume that the caller already owns its
3055 * lock.
3056 */
3057int usb_reset_composite_device(struct usb_device *udev,
3058 struct usb_interface *iface)
3059{
3060 int ret;
3061 struct usb_host_config *config = udev->actconfig;
3062
3063 if (udev->state == USB_STATE_NOTATTACHED ||
3064 udev->state == USB_STATE_SUSPENDED) {
3065 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3066 udev->state);
3067 return -EINVAL;
3068 }
3069
645daaab 3070 /* Prevent autosuspend during the reset */
94fcda1f 3071 usb_autoresume_device(udev);
645daaab 3072
79efa097
AS		 3073 if (iface && iface->condition != USB_INTERFACE_BINDING)
3074 iface = NULL;
3075
3076 if (config) {
3077 int i;
3078 struct usb_interface *cintf;
3079 struct usb_driver *drv;
3080
3081 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3082 cintf = config->interface[i];
3083 if (cintf != iface)
3084 down(&cintf->dev.sem);
3085 if (device_is_registered(&cintf->dev) &&
3086 cintf->dev.driver) {
3087 drv = to_usb_driver(cintf->dev.driver);
3088 if (drv->pre_reset)
3089 (drv->pre_reset)(cintf);
3090 }
3091 }
3092 }
3093
3094 ret = usb_reset_device(udev);
3095
3096 if (config) {
3097 int i;
3098 struct usb_interface *cintf;
3099 struct usb_driver *drv;
3100
3101 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3102 cintf = config->interface[i];
3103 if (device_is_registered(&cintf->dev) &&
3104 cintf->dev.driver) {
3105 drv = to_usb_driver(cintf->dev.driver);
3106 if (drv->post_reset)
3107 (drv->post_reset)(cintf);
3108 }
3109 if (cintf != iface)
3110 up(&cintf->dev.sem);
3111 }
3112 }
3113
94fcda1f 3114 usb_autosuspend_device(udev);
79efa097
AS		 3115 return ret;
3116}
140d8f68 3117EXPORT_SYMBOL(usb_reset_composite_device);
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