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[PATCH] USB: unusual_devs entry for Samsung MP3 player
[deliverable/linux.git] / drivers / usb / core / hub.c
CommitLineData
1da177e4
LT		 1/*
2 * USB hub driver.
3 *
4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
8 *
9 */
10
1da177e4
LT		 11#include <linux/kernel.h>
12#include <linux/errno.h>
13#include <linux/module.h>
14#include <linux/moduleparam.h>
15#include <linux/completion.h>
16#include <linux/sched.h>
17#include <linux/list.h>
18#include <linux/slab.h>
19#include <linux/smp_lock.h>
20#include <linux/ioctl.h>
21#include <linux/usb.h>
22#include <linux/usbdevice_fs.h>
9c8d6178 23#include <linux/kthread.h>
4186ecf8 24#include <linux/mutex.h>
1da177e4
LT		 25
26#include <asm/semaphore.h>
27#include <asm/uaccess.h>
28#include <asm/byteorder.h>
29
30#include "usb.h"
31#include "hcd.h"
32#include "hub.h"
33
34/* Protect struct usb_device->state and ->children members
9ad3d6cc 35 * Note: Both are also protected by ->dev.sem, except that ->state can
1da177e4
LT		 36 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
37static DEFINE_SPINLOCK(device_state_lock);
38
39/* khubd's worklist and its lock */
40static DEFINE_SPINLOCK(hub_event_lock);
41static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
42
43/* Wakes up khubd */
44static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
45
9c8d6178 46static struct task_struct *khubd_task;
1da177e4
LT		 47
48/* cycle leds on hubs that aren't blinking for attention */
49static int blinkenlights = 0;
50module_param (blinkenlights, bool, S_IRUGO);
51MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
52
53/*
54 * As of 2.6.10 we introduce a new USB device initialization scheme which
55 * closely resembles the way Windows works. Hopefully it will be compatible
56 * with a wider range of devices than the old scheme. However some previously
57 * working devices may start giving rise to "device not accepting address"
58 * errors; if that happens the user can try the old scheme by adjusting the
59 * following module parameters.
60 *
61 * For maximum flexibility there are two boolean parameters to control the
62 * hub driver's behavior. On the first initialization attempt, if the
63 * "old_scheme_first" parameter is set then the old scheme will be used,
64 * otherwise the new scheme is used. If that fails and "use_both_schemes"
65 * is set, then the driver will make another attempt, using the other scheme.
66 */
67static int old_scheme_first = 0;
68module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
69MODULE_PARM_DESC(old_scheme_first,
70 "start with the old device initialization scheme");
71
72static int use_both_schemes = 1;
73module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
74MODULE_PARM_DESC(use_both_schemes,
75 "try the other device initialization scheme if the "
76 "first one fails");
77
78
79#ifdef DEBUG
80static inline char *portspeed (int portstatus)
81{
82 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
83 return "480 Mb/s";
84 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
85 return "1.5 Mb/s";
86 else
87 return "12 Mb/s";
88}
89#endif
90
91/* Note that hdev or one of its children must be locked! */
92static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
93{
94 return usb_get_intfdata(hdev->actconfig->interface[0]);
95}
96
97/* USB 2.0 spec Section 11.24.4.5 */
98static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
99{
100 int i, ret;
101
102 for (i = 0; i < 3; i++) {
103 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
104 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
105 USB_DT_HUB << 8, 0, data, size,
106 USB_CTRL_GET_TIMEOUT);
107 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
108 return ret;
109 }
110 return -EINVAL;
111}
112
113/*
114 * USB 2.0 spec Section 11.24.2.1
115 */
116static int clear_hub_feature(struct usb_device *hdev, int feature)
117{
118 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
119 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
120}
121
122/*
123 * USB 2.0 spec Section 11.24.2.2
124 */
125static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
126{
127 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
128 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
129 NULL, 0, 1000);
130}
131
132/*
133 * USB 2.0 spec Section 11.24.2.13
134 */
135static int set_port_feature(struct usb_device *hdev, int port1, int feature)
136{
137 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
138 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
139 NULL, 0, 1000);
140}
141
142/*
143 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
144 * for info about using port indicators
145 */
146static void set_port_led(
147 struct usb_hub *hub,
148 int port1,
149 int selector
150)
151{
152 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
153 USB_PORT_FEAT_INDICATOR);
154 if (status < 0)
155 dev_dbg (hub->intfdev,
156 "port %d indicator %s status %d\n",
157 port1,
158 ({ char *s; switch (selector) {
159 case HUB_LED_AMBER: s = "amber"; break;
160 case HUB_LED_GREEN: s = "green"; break;
161 case HUB_LED_OFF: s = "off"; break;
162 case HUB_LED_AUTO: s = "auto"; break;
163 default: s = "??"; break;
164 }; s; }),
165 status);
166}
167
168#define LED_CYCLE_PERIOD ((2*HZ)/3)
169
170static void led_work (void *__hub)
171{
172 struct usb_hub *hub = __hub;
173 struct usb_device *hdev = hub->hdev;
174 unsigned i;
175 unsigned changed = 0;
176 int cursor = -1;
177
178 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
179 return;
180
181 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
182 unsigned selector, mode;
183
184 /* 30%-50% duty cycle */
185
186 switch (hub->indicator[i]) {
187 /* cycle marker */
188 case INDICATOR_CYCLE:
189 cursor = i;
190 selector = HUB_LED_AUTO;
191 mode = INDICATOR_AUTO;
192 break;
193 /* blinking green = sw attention */
194 case INDICATOR_GREEN_BLINK:
195 selector = HUB_LED_GREEN;
196 mode = INDICATOR_GREEN_BLINK_OFF;
197 break;
198 case INDICATOR_GREEN_BLINK_OFF:
199 selector = HUB_LED_OFF;
200 mode = INDICATOR_GREEN_BLINK;
201 break;
202 /* blinking amber = hw attention */
203 case INDICATOR_AMBER_BLINK:
204 selector = HUB_LED_AMBER;
205 mode = INDICATOR_AMBER_BLINK_OFF;
206 break;
207 case INDICATOR_AMBER_BLINK_OFF:
208 selector = HUB_LED_OFF;
209 mode = INDICATOR_AMBER_BLINK;
210 break;
211 /* blink green/amber = reserved */
212 case INDICATOR_ALT_BLINK:
213 selector = HUB_LED_GREEN;
214 mode = INDICATOR_ALT_BLINK_OFF;
215 break;
216 case INDICATOR_ALT_BLINK_OFF:
217 selector = HUB_LED_AMBER;
218 mode = INDICATOR_ALT_BLINK;
219 break;
220 default:
221 continue;
222 }
223 if (selector != HUB_LED_AUTO)
224 changed = 1;
225 set_port_led(hub, i + 1, selector);
226 hub->indicator[i] = mode;
227 }
228 if (!changed && blinkenlights) {
229 cursor++;
230 cursor %= hub->descriptor->bNbrPorts;
231 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
232 hub->indicator[cursor] = INDICATOR_CYCLE;
233 changed++;
234 }
235 if (changed)
236 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
237}
238
239/* use a short timeout for hub/port status fetches */
240#define USB_STS_TIMEOUT 1000
241#define USB_STS_RETRIES 5
242
243/*
244 * USB 2.0 spec Section 11.24.2.6
245 */
246static int get_hub_status(struct usb_device *hdev,
247 struct usb_hub_status *data)
248{
249 int i, status = -ETIMEDOUT;
250
251 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
252 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
253 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
254 data, sizeof(*data), USB_STS_TIMEOUT);
255 }
256 return status;
257}
258
259/*
260 * USB 2.0 spec Section 11.24.2.7
261 */
262static int get_port_status(struct usb_device *hdev, int port1,
263 struct usb_port_status *data)
264{
265 int i, status = -ETIMEDOUT;
266
267 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
268 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
269 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
270 data, sizeof(*data), USB_STS_TIMEOUT);
271 }
272 return status;
273}
274
275static void kick_khubd(struct usb_hub *hub)
276{
277 unsigned long flags;
278
279 spin_lock_irqsave(&hub_event_lock, flags);
280 if (list_empty(&hub->event_list)) {
281 list_add_tail(&hub->event_list, &hub_event_list);
282 wake_up(&khubd_wait);
283 }
284 spin_unlock_irqrestore(&hub_event_lock, flags);
285}
286
287void usb_kick_khubd(struct usb_device *hdev)
288{
289 kick_khubd(hdev_to_hub(hdev));
290}
291
292
293/* completion function, fires on port status changes and various faults */
294static void hub_irq(struct urb *urb, struct pt_regs *regs)
295{
296 struct usb_hub *hub = (struct usb_hub *)urb->context;
297 int status;
298 int i;
299 unsigned long bits;
300
301 switch (urb->status) {
302 case -ENOENT: /* synchronous unlink */
303 case -ECONNRESET: /* async unlink */
304 case -ESHUTDOWN: /* hardware going away */
305 return;
306
307 default: /* presumably an error */
308 /* Cause a hub reset after 10 consecutive errors */
309 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
310 if ((++hub->nerrors < 10) || hub->error)
311 goto resubmit;
312 hub->error = urb->status;
313 /* FALL THROUGH */
314
315 /* let khubd handle things */
316 case 0: /* we got data: port status changed */
317 bits = 0;
318 for (i = 0; i < urb->actual_length; ++i)
319 bits |= ((unsigned long) ((*hub->buffer)[i]))
320 << (i*8);
321 hub->event_bits[0] = bits;
322 break;
323 }
324
325 hub->nerrors = 0;
326
327 /* Something happened, let khubd figure it out */
328 kick_khubd(hub);
329
330resubmit:
331 if (hub->quiescing)
332 return;
333
334 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
335 && status != -ENODEV && status != -EPERM)
336 dev_err (hub->intfdev, "resubmit --> %d\n", status);
337}
338
339/* USB 2.0 spec Section 11.24.2.3 */
340static inline int
341hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
342{
343 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
344 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
345 tt, NULL, 0, 1000);
346}
347
348/*
349 * enumeration blocks khubd for a long time. we use keventd instead, since
350 * long blocking there is the exception, not the rule. accordingly, HCDs
351 * talking to TTs must queue control transfers (not just bulk and iso), so
352 * both can talk to the same hub concurrently.
353 */
354static void hub_tt_kevent (void *arg)
355{
356 struct usb_hub *hub = arg;
357 unsigned long flags;
358
359 spin_lock_irqsave (&hub->tt.lock, flags);
360 while (!list_empty (&hub->tt.clear_list)) {
361 struct list_head *temp;
362 struct usb_tt_clear *clear;
363 struct usb_device *hdev = hub->hdev;
364 int status;
365
366 temp = hub->tt.clear_list.next;
367 clear = list_entry (temp, struct usb_tt_clear, clear_list);
368 list_del (&clear->clear_list);
369
370 /* drop lock so HCD can concurrently report other TT errors */
371 spin_unlock_irqrestore (&hub->tt.lock, flags);
372 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
373 spin_lock_irqsave (&hub->tt.lock, flags);
374
375 if (status)
376 dev_err (&hdev->dev,
377 "clear tt %d (%04x) error %d\n",
378 clear->tt, clear->devinfo, status);
1bc3c9e1 379 kfree(clear);
1da177e4
LT		 380 }
381 spin_unlock_irqrestore (&hub->tt.lock, flags);
382}
383
384/**
385 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
386 * @udev: the device whose split transaction failed
387 * @pipe: identifies the endpoint of the failed transaction
388 *
389 * High speed HCDs use this to tell the hub driver that some split control or
390 * bulk transaction failed in a way that requires clearing internal state of
391 * a transaction translator. This is normally detected (and reported) from
392 * interrupt context.
393 *
394 * It may not be possible for that hub to handle additional full (or low)
395 * speed transactions until that state is fully cleared out.
396 */
397void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
398{
399 struct usb_tt *tt = udev->tt;
400 unsigned long flags;
401 struct usb_tt_clear *clear;
402
403 /* we've got to cope with an arbitrary number of pending TT clears,
404 * since each TT has "at least two" buffers that can need it (and
405 * there can be many TTs per hub). even if they're uncommon.
406 */
407 if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) {
408 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
409 /* FIXME recover somehow ... RESET_TT? */
410 return;
411 }
412
413 /* info that CLEAR_TT_BUFFER needs */
414 clear->tt = tt->multi ? udev->ttport : 1;
415 clear->devinfo = usb_pipeendpoint (pipe);
416 clear->devinfo |= udev->devnum << 4;
417 clear->devinfo |= usb_pipecontrol (pipe)
418 ? (USB_ENDPOINT_XFER_CONTROL << 11)
419 : (USB_ENDPOINT_XFER_BULK << 11);
420 if (usb_pipein (pipe))
421 clear->devinfo |= 1 << 15;
422
423 /* tell keventd to clear state for this TT */
424 spin_lock_irqsave (&tt->lock, flags);
425 list_add_tail (&clear->clear_list, &tt->clear_list);
426 schedule_work (&tt->kevent);
427 spin_unlock_irqrestore (&tt->lock, flags);
428}
429
430static void hub_power_on(struct usb_hub *hub)
431{
432 int port1;
b789696a 433 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
4489a571
AS		 434 u16 wHubCharacteristics =
435 le16_to_cpu(hub->descriptor->wHubCharacteristics);
436
437 /* Enable power on each port. Some hubs have reserved values
438 * of LPSM (> 2) in their descriptors, even though they are
439 * USB 2.0 hubs. Some hubs do not implement port-power switching
440 * but only emulate it. In all cases, the ports won't work
441 * unless we send these messages to the hub.
442 */
443 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
1da177e4 444 dev_dbg(hub->intfdev, "enabling power on all ports\n");
4489a571
AS		 445 else
446 dev_dbg(hub->intfdev, "trying to enable port power on "
447 "non-switchable hub\n");
448 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
449 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
1da177e4 450
b789696a
DB		 451 /* Wait at least 100 msec for power to become stable */
452 msleep(max(pgood_delay, (unsigned) 100));
1da177e4
LT		 453}
454
979d5199 455static inline void __hub_quiesce(struct usb_hub *hub)
1da177e4 456{
979d5199 457 /* (nonblocking) khubd and related activity won't re-trigger */
1da177e4 458 hub->quiescing = 1;
c9f89fa4 459 hub->activating = 0;
979d5199
DB		 460 hub->resume_root_hub = 0;
461}
462
463static void hub_quiesce(struct usb_hub *hub)
464{
465 /* (blocking) stop khubd and related activity */
466 __hub_quiesce(hub);
1da177e4
LT		 467 usb_kill_urb(hub->urb);
468 if (hub->has_indicators)
469 cancel_delayed_work(&hub->leds);
470 if (hub->has_indicators || hub->tt.hub)
471 flush_scheduled_work();
472}
473
474static void hub_activate(struct usb_hub *hub)
475{
476 int status;
477
478 hub->quiescing = 0;
479 hub->activating = 1;
979d5199 480 hub->resume_root_hub = 0;
1da177e4
LT		 481 status = usb_submit_urb(hub->urb, GFP_NOIO);
482 if (status < 0)
483 dev_err(hub->intfdev, "activate --> %d\n", status);
484 if (hub->has_indicators && blinkenlights)
485 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
486
487 /* scan all ports ASAP */
488 kick_khubd(hub);
489}
490
491static int hub_hub_status(struct usb_hub *hub,
492 u16 *status, u16 *change)
493{
494 int ret;
495
496 ret = get_hub_status(hub->hdev, &hub->status->hub);
497 if (ret < 0)
498 dev_err (hub->intfdev,
499 "%s failed (err = %d)\n", __FUNCTION__, ret);
500 else {
501 *status = le16_to_cpu(hub->status->hub.wHubStatus);
502 *change = le16_to_cpu(hub->status->hub.wHubChange);
503 ret = 0;
504 }
505 return ret;
506}
507
8b28c752
AS		 508static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
509{
510 struct usb_device *hdev = hub->hdev;
511 int ret;
512
513 if (hdev->children[port1-1] && set_state) {
514 usb_set_device_state(hdev->children[port1-1],
515 USB_STATE_NOTATTACHED);
516 }
517 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
518 if (ret)
519 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
520 port1, ret);
521
522 return ret;
523}
524
7d069b7d
AS		 525
526/* caller has locked the hub device */
7de18d8b 527static void hub_pre_reset(struct usb_interface *intf)
7d069b7d 528{
7de18d8b 529 struct usb_hub *hub = usb_get_intfdata(intf);
7d069b7d
AS		 530 struct usb_device *hdev = hub->hdev;
531 int port1;
532
533 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
534 if (hdev->children[port1 - 1]) {
535 usb_disconnect(&hdev->children[port1 - 1]);
7de18d8b 536 if (hub->error == 0)
7d069b7d
AS		 537 hub_port_disable(hub, port1, 0);
538 }
539 }
540 hub_quiesce(hub);
541}
542
543/* caller has locked the hub device */
7de18d8b 544static void hub_post_reset(struct usb_interface *intf)
7d069b7d 545{
7de18d8b
AS		 546 struct usb_hub *hub = usb_get_intfdata(intf);
547
7d069b7d
AS		 548 hub_activate(hub);
549 hub_power_on(hub);
550}
551
552
1da177e4
LT		 553static int hub_configure(struct usb_hub *hub,
554 struct usb_endpoint_descriptor *endpoint)
555{
556 struct usb_device *hdev = hub->hdev;
557 struct device *hub_dev = hub->intfdev;
558 u16 hubstatus, hubchange;
74ad9bd2 559 u16 wHubCharacteristics;
1da177e4
LT		 560 unsigned int pipe;
561 int maxp, ret;
562 char *message;
563
564 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
565 &hub->buffer_dma);
566 if (!hub->buffer) {
567 message = "can't allocate hub irq buffer";
568 ret = -ENOMEM;
569 goto fail;
570 }
571
572 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
573 if (!hub->status) {
574 message = "can't kmalloc hub status buffer";
575 ret = -ENOMEM;
576 goto fail;
577 }
578
579 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
580 if (!hub->descriptor) {
581 message = "can't kmalloc hub descriptor";
582 ret = -ENOMEM;
583 goto fail;
584 }
585
586 /* Request the entire hub descriptor.
587 * hub->descriptor can handle USB_MAXCHILDREN ports,
588 * but the hub can/will return fewer bytes here.
589 */
590 ret = get_hub_descriptor(hdev, hub->descriptor,
591 sizeof(*hub->descriptor));
592 if (ret < 0) {
593 message = "can't read hub descriptor";
594 goto fail;
595 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
596 message = "hub has too many ports!";
597 ret = -ENODEV;
598 goto fail;
599 }
600
601 hdev->maxchild = hub->descriptor->bNbrPorts;
602 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
603 (hdev->maxchild == 1) ? "" : "s");
604
74ad9bd2 605 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4 606
74ad9bd2 607 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
1da177e4
LT		 608 int i;
609 char portstr [USB_MAXCHILDREN + 1];
610
611 for (i = 0; i < hdev->maxchild; i++)
612 portstr[i] = hub->descriptor->DeviceRemovable
613 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
614 ? 'F' : 'R';
615 portstr[hdev->maxchild] = 0;
616 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
617 } else
618 dev_dbg(hub_dev, "standalone hub\n");
619
74ad9bd2 620 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1da177e4
LT		 621 case 0x00:
622 dev_dbg(hub_dev, "ganged power switching\n");
623 break;
624 case 0x01:
625 dev_dbg(hub_dev, "individual port power switching\n");
626 break;
627 case 0x02:
628 case 0x03:
629 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
630 break;
631 }
632
74ad9bd2 633 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1da177e4
LT		 634 case 0x00:
635 dev_dbg(hub_dev, "global over-current protection\n");
636 break;
637 case 0x08:
638 dev_dbg(hub_dev, "individual port over-current protection\n");
639 break;
640 case 0x10:
641 case 0x18:
642 dev_dbg(hub_dev, "no over-current protection\n");
643 break;
644 }
645
646 spin_lock_init (&hub->tt.lock);
647 INIT_LIST_HEAD (&hub->tt.clear_list);
648 INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
649 switch (hdev->descriptor.bDeviceProtocol) {
650 case 0:
651 break;
652 case 1:
653 dev_dbg(hub_dev, "Single TT\n");
654 hub->tt.hub = hdev;
655 break;
656 case 2:
657 ret = usb_set_interface(hdev, 0, 1);
658 if (ret == 0) {
659 dev_dbg(hub_dev, "TT per port\n");
660 hub->tt.multi = 1;
661 } else
662 dev_err(hub_dev, "Using single TT (err %d)\n",
663 ret);
664 hub->tt.hub = hdev;
665 break;
666 default:
667 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
668 hdev->descriptor.bDeviceProtocol);
669 break;
670 }
671
e09711ae 672 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
74ad9bd2 673 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
e09711ae 674 case HUB_TTTT_8_BITS:
675 if (hdev->descriptor.bDeviceProtocol != 0) {
676 hub->tt.think_time = 666;
677 dev_dbg(hub_dev, "TT requires at most %d "
678 "FS bit times (%d ns)\n",
679 8, hub->tt.think_time);
680 }
1da177e4 681 break;
e09711ae 682 case HUB_TTTT_16_BITS:
683 hub->tt.think_time = 666 * 2;
684 dev_dbg(hub_dev, "TT requires at most %d "
685 "FS bit times (%d ns)\n",
686 16, hub->tt.think_time);
1da177e4 687 break;
e09711ae 688 case HUB_TTTT_24_BITS:
689 hub->tt.think_time = 666 * 3;
690 dev_dbg(hub_dev, "TT requires at most %d "
691 "FS bit times (%d ns)\n",
692 24, hub->tt.think_time);
1da177e4 693 break;
e09711ae 694 case HUB_TTTT_32_BITS:
695 hub->tt.think_time = 666 * 4;
696 dev_dbg(hub_dev, "TT requires at most %d "
697 "FS bit times (%d ns)\n",
698 32, hub->tt.think_time);
1da177e4
LT		 699 break;
700 }
701
702 /* probe() zeroes hub->indicator[] */
74ad9bd2 703 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1da177e4
LT		 704 hub->has_indicators = 1;
705 dev_dbg(hub_dev, "Port indicators are supported\n");
706 }
707
708 dev_dbg(hub_dev, "power on to power good time: %dms\n",
709 hub->descriptor->bPwrOn2PwrGood * 2);
710
711 /* power budgeting mostly matters with bus-powered hubs,
712 * and battery-powered root hubs (may provide just 8 mA).
713 */
714 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
55c52718 715 if (ret < 2) {
1da177e4
LT		 716 message = "can't get hub status";
717 goto fail;
718 }
7d35b929
AS		 719 le16_to_cpus(&hubstatus);
720 if (hdev == hdev->bus->root_hub) {
55c52718
AS		 721 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
722 hub->mA_per_port = 500;
723 else {
724 hub->mA_per_port = hdev->bus_mA;
725 hub->limited_power = 1;
726 }
7d35b929 727 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1da177e4
LT		 728 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
729 hub->descriptor->bHubContrCurrent);
55c52718
AS		 730 hub->limited_power = 1;
731 if (hdev->maxchild > 0) {
732 int remaining = hdev->bus_mA -
733 hub->descriptor->bHubContrCurrent;
734
735 if (remaining < hdev->maxchild * 100)
736 dev_warn(hub_dev,
737 "insufficient power available "
738 "to use all downstream ports\n");
739 hub->mA_per_port = 100; /* 7.2.1.1 */
740 }
741 } else { /* Self-powered external hub */
742 /* FIXME: What about battery-powered external hubs that
743 * provide less current per port? */
744 hub->mA_per_port = 500;
7d35b929 745 }
55c52718
AS		 746 if (hub->mA_per_port < 500)
747 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
748 hub->mA_per_port);
1da177e4
LT		 749
750 ret = hub_hub_status(hub, &hubstatus, &hubchange);
751 if (ret < 0) {
752 message = "can't get hub status";
753 goto fail;
754 }
755
756 /* local power status reports aren't always correct */
757 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
758 dev_dbg(hub_dev, "local power source is %s\n",
759 (hubstatus & HUB_STATUS_LOCAL_POWER)
760 ? "lost (inactive)" : "good");
761
74ad9bd2 762 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1da177e4
LT		 763 dev_dbg(hub_dev, "%sover-current condition exists\n",
764 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
765
766 /* set up the interrupt endpoint */
767 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
768 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
769
770 if (maxp > sizeof(*hub->buffer))
771 maxp = sizeof(*hub->buffer);
772
773 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
774 if (!hub->urb) {
775 message = "couldn't allocate interrupt urb";
776 ret = -ENOMEM;
777 goto fail;
778 }
779
780 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
781 hub, endpoint->bInterval);
782 hub->urb->transfer_dma = hub->buffer_dma;
783 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
784
785 /* maybe cycle the hub leds */
786 if (hub->has_indicators && blinkenlights)
787 hub->indicator [0] = INDICATOR_CYCLE;
788
789 hub_power_on(hub);
790 hub_activate(hub);
791 return 0;
792
793fail:
794 dev_err (hub_dev, "config failed, %s (err %d)\n",
795 message, ret);
796 /* hub_disconnect() frees urb and descriptor */
797 return ret;
798}
799
800static unsigned highspeed_hubs;
801
802static void hub_disconnect(struct usb_interface *intf)
803{
804 struct usb_hub *hub = usb_get_intfdata (intf);
805 struct usb_device *hdev;
806
7de18d8b
AS		 807 /* Disconnect all children and quiesce the hub */
808 hub->error = 0;
809 hub_pre_reset(intf);
810
8b28c752 811 usb_set_intfdata (intf, NULL);
1da177e4
LT		 812 hdev = hub->hdev;
813
814 if (hdev->speed == USB_SPEED_HIGH)
815 highspeed_hubs--;
816
1da177e4
LT		 817 usb_free_urb(hub->urb);
818 hub->urb = NULL;
819
820 spin_lock_irq(&hub_event_lock);
821 list_del_init(&hub->event_list);
822 spin_unlock_irq(&hub_event_lock);
823
1bc3c9e1
JJ		 824 kfree(hub->descriptor);
825 hub->descriptor = NULL;
1da177e4 826
1bc3c9e1
JJ		 827 kfree(hub->status);
828 hub->status = NULL;
1da177e4
LT		 829
830 if (hub->buffer) {
831 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
832 hub->buffer_dma);
833 hub->buffer = NULL;
834 }
835
7d069b7d 836 kfree(hub);
1da177e4
LT		 837}
838
839static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
840{
841 struct usb_host_interface *desc;
842 struct usb_endpoint_descriptor *endpoint;
843 struct usb_device *hdev;
844 struct usb_hub *hub;
845
846 desc = intf->cur_altsetting;
847 hdev = interface_to_usbdev(intf);
848
89ccbdc9
DB		 849#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
850 if (hdev->parent) {
851 dev_warn(&intf->dev, "ignoring external hub\n");
852 return -ENODEV;
853 }
854#endif
855
1da177e4
LT		 856 /* Some hubs have a subclass of 1, which AFAICT according to the */
857 /* specs is not defined, but it works */
858 if ((desc->desc.bInterfaceSubClass != 0) &&
859 (desc->desc.bInterfaceSubClass != 1)) {
860descriptor_error:
861 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
862 return -EIO;
863 }
864
865 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
866 if (desc->desc.bNumEndpoints != 1)
867 goto descriptor_error;
868
869 endpoint = &desc->endpoint[0].desc;
870
871 /* Output endpoint? Curiouser and curiouser.. */
872 if (!(endpoint->bEndpointAddress & USB_DIR_IN))
873 goto descriptor_error;
874
875 /* If it's not an interrupt endpoint, we'd better punt! */
876 if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
877 != USB_ENDPOINT_XFER_INT)
878 goto descriptor_error;
879
880 /* We found a hub */
881 dev_info (&intf->dev, "USB hub found\n");
882
0a1ef3b5 883 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1da177e4
LT		 884 if (!hub) {
885 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
886 return -ENOMEM;
887 }
888
1da177e4
LT		 889 INIT_LIST_HEAD(&hub->event_list);
890 hub->intfdev = &intf->dev;
891 hub->hdev = hdev;
892 INIT_WORK(&hub->leds, led_work, hub);
893
894 usb_set_intfdata (intf, hub);
895
896 if (hdev->speed == USB_SPEED_HIGH)
897 highspeed_hubs++;
898
899 if (hub_configure(hub, endpoint) >= 0)
900 return 0;
901
902 hub_disconnect (intf);
903 return -ENODEV;
904}
905
906static int
907hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
908{
909 struct usb_device *hdev = interface_to_usbdev (intf);
910
911 /* assert ifno == 0 (part of hub spec) */
912 switch (code) {
913 case USBDEVFS_HUB_PORTINFO: {
914 struct usbdevfs_hub_portinfo *info = user_data;
915 int i;
916
917 spin_lock_irq(&device_state_lock);
918 if (hdev->devnum <= 0)
919 info->nports = 0;
920 else {
921 info->nports = hdev->maxchild;
922 for (i = 0; i < info->nports; i++) {
923 if (hdev->children[i] == NULL)
924 info->port[i] = 0;
925 else
926 info->port[i] =
927 hdev->children[i]->devnum;
928 }
929 }
930 spin_unlock_irq(&device_state_lock);
931
932 return info->nports + 1;
933 }
934
935 default:
936 return -ENOSYS;
937 }
938}
939
1da177e4
LT		 940
941/* grab device/port lock, returning index of that port (zero based).
942 * protects the upstream link used by this device from concurrent
943 * tree operations like suspend, resume, reset, and disconnect, which
944 * apply to everything downstream of a given port.
945 */
946static int locktree(struct usb_device *udev)
947{
948 int t;
949 struct usb_device *hdev;
950
951 if (!udev)
952 return -ENODEV;
953
954 /* root hub is always the first lock in the series */
955 hdev = udev->parent;
956 if (!hdev) {
957 usb_lock_device(udev);
958 return 0;
959 }
960
961 /* on the path from root to us, lock everything from
962 * top down, dropping parent locks when not needed
963 */
964 t = locktree(hdev);
965 if (t < 0)
966 return t;
1da177e4 967
12c3da34
AS		 968 /* everything is fail-fast once disconnect
969 * processing starts
970 */
971 if (udev->state == USB_STATE_NOTATTACHED) {
972 usb_unlock_device(hdev);
973 return -ENODEV;
1da177e4 974 }
12c3da34
AS		 975
976 /* when everyone grabs locks top->bottom,
977 * non-overlapping work may be concurrent
978 */
979 usb_lock_device(udev);
1da177e4 980 usb_unlock_device(hdev);
12c3da34 981 return udev->portnum;
1da177e4
LT		 982}
983
984static void recursively_mark_NOTATTACHED(struct usb_device *udev)
985{
986 int i;
987
988 for (i = 0; i < udev->maxchild; ++i) {
989 if (udev->children[i])
990 recursively_mark_NOTATTACHED(udev->children[i]);
991 }
992 udev->state = USB_STATE_NOTATTACHED;
993}
994
995/**
996 * usb_set_device_state - change a device's current state (usbcore, hcds)
997 * @udev: pointer to device whose state should be changed
998 * @new_state: new state value to be stored
999 *
1000 * udev->state is _not_ fully protected by the device lock. Although
1001 * most transitions are made only while holding the lock, the state can
1002 * can change to USB_STATE_NOTATTACHED at almost any time. This
1003 * is so that devices can be marked as disconnected as soon as possible,
1004 * without having to wait for any semaphores to be released. As a result,
1005 * all changes to any device's state must be protected by the
1006 * device_state_lock spinlock.
1007 *
1008 * Once a device has been added to the device tree, all changes to its state
1009 * should be made using this routine. The state should _not_ be set directly.
1010 *
1011 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1012 * Otherwise udev->state is set to new_state, and if new_state is
1013 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1014 * to USB_STATE_NOTATTACHED.
1015 */
1016void usb_set_device_state(struct usb_device *udev,
1017 enum usb_device_state new_state)
1018{
1019 unsigned long flags;
1020
1021 spin_lock_irqsave(&device_state_lock, flags);
1022 if (udev->state == USB_STATE_NOTATTACHED)
1023 ; /* do nothing */
b94dc6b5 1024 else if (new_state != USB_STATE_NOTATTACHED) {
1da177e4 1025 udev->state = new_state;
fb669cc0
DB		 1026
1027 /* root hub wakeup capabilities are managed out-of-band
1028 * and may involve silicon errata ... ignore them here.
1029 */
1030 if (udev->parent) {
1031 if (new_state == USB_STATE_CONFIGURED)
1032 device_init_wakeup(&udev->dev,
1033 (udev->actconfig->desc.bmAttributes
1034 & USB_CONFIG_ATT_WAKEUP));
1035 else if (new_state != USB_STATE_SUSPENDED)
1036 device_init_wakeup(&udev->dev, 0);
1037 }
b94dc6b5 1038 } else
1da177e4
LT		 1039 recursively_mark_NOTATTACHED(udev);
1040 spin_unlock_irqrestore(&device_state_lock, flags);
1041}
1da177e4
LT		 1042
1043
1c50c317
AS		 1044#ifdef CONFIG_PM
1045
1046/**
1047 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1048 * @rhdev: struct usb_device for the root hub
1049 *
1050 * The USB host controller driver calls this function when its root hub
1051 * is resumed and Vbus power has been interrupted or the controller
1052 * has been reset. The routine marks all the children of the root hub
1053 * as NOTATTACHED and marks logical connect-change events on their ports.
1054 */
1055void usb_root_hub_lost_power(struct usb_device *rhdev)
1056{
1057 struct usb_hub *hub;
1058 int port1;
1059 unsigned long flags;
1060
1061 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
1062 spin_lock_irqsave(&device_state_lock, flags);
1063 hub = hdev_to_hub(rhdev);
1064 for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
1065 if (rhdev->children[port1 - 1]) {
1066 recursively_mark_NOTATTACHED(
1067 rhdev->children[port1 - 1]);
1068 set_bit(port1, hub->change_bits);
1069 }
1070 }
1071 spin_unlock_irqrestore(&device_state_lock, flags);
1072}
1073EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1074
1075#endif
1076
1da177e4
LT		 1077static void choose_address(struct usb_device *udev)
1078{
1079 int devnum;
1080 struct usb_bus *bus = udev->bus;
1081
1082 /* If khubd ever becomes multithreaded, this will need a lock */
1083
1084 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1085 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1086 bus->devnum_next);
1087 if (devnum >= 128)
1088 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1089
1090 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1091
1092 if (devnum < 128) {
1093 set_bit(devnum, bus->devmap.devicemap);
1094 udev->devnum = devnum;
1095 }
1096}
1097
1098static void release_address(struct usb_device *udev)
1099{
1100 if (udev->devnum > 0) {
1101 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1102 udev->devnum = -1;
1103 }
1104}
1105
1106/**
1107 * usb_disconnect - disconnect a device (usbcore-internal)
1108 * @pdev: pointer to device being disconnected
1109 * Context: !in_interrupt ()
1110 *
1111 * Something got disconnected. Get rid of it and all of its children.
1112 *
1113 * If *pdev is a normal device then the parent hub must already be locked.
1114 * If *pdev is a root hub then this routine will acquire the
1115 * usb_bus_list_lock on behalf of the caller.
1116 *
1117 * Only hub drivers (including virtual root hub drivers for host
1118 * controllers) should ever call this.
1119 *
1120 * This call is synchronous, and may not be used in an interrupt context.
1121 */
1122void usb_disconnect(struct usb_device **pdev)
1123{
1124 struct usb_device *udev = *pdev;
1125 int i;
1126
1127 if (!udev) {
1128 pr_debug ("%s nodev\n", __FUNCTION__);
1129 return;
1130 }
1131
1132 /* mark the device as inactive, so any further urb submissions for
1133 * this device (and any of its children) will fail immediately.
1134 * this quiesces everyting except pending urbs.
1135 */
1136 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1da177e4
LT		 1137 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1138
9ad3d6cc
AS		 1139 usb_lock_device(udev);
1140
1da177e4
LT		 1141 /* Free up all the children before we remove this device */
1142 for (i = 0; i < USB_MAXCHILDREN; i++) {
1143 if (udev->children[i])
1144 usb_disconnect(&udev->children[i]);
1145 }
1146
1147 /* deallocate hcd/hardware state ... nuking all pending urbs and
1148 * cleaning up all state associated with the current configuration
1149 * so that the hardware is now fully quiesced.
1150 */
1151 usb_disable_device(udev, 0);
1152
3099e75a
GKH		 1153 usb_notify_remove_device(udev);
1154
1da177e4
LT		 1155 /* Free the device number, remove the /proc/bus/usb entry and
1156 * the sysfs attributes, and delete the parent's children[]
1157 * (or root_hub) pointer.
1158 */
1159 dev_dbg (&udev->dev, "unregistering device\n");
1160 release_address(udev);
1da177e4
LT		 1161 usb_remove_sysfs_dev_files(udev);
1162
1163 /* Avoid races with recursively_mark_NOTATTACHED() */
1164 spin_lock_irq(&device_state_lock);
1165 *pdev = NULL;
1166 spin_unlock_irq(&device_state_lock);
1167
9ad3d6cc 1168 usb_unlock_device(udev);
1da177e4
LT		 1169
1170 device_unregister(&udev->dev);
1171}
1172
55c52718
AS		 1173static inline const char *plural(int n)
1174{
1175 return (n == 1 ? "" : "s");
1176}
1177
1da177e4
LT		 1178static int choose_configuration(struct usb_device *udev)
1179{
55c52718 1180 int i;
55c52718 1181 int num_configs;
1fbe75e1 1182 int insufficient_power = 0;
55c52718
AS		 1183 struct usb_host_config *c, *best;
1184
55c52718
AS		 1185 best = NULL;
1186 c = udev->config;
1187 num_configs = udev->descriptor.bNumConfigurations;
1188 for (i = 0; i < num_configs; (i++, c++)) {
6aa35675
AS		 1189 struct usb_interface_descriptor *desc = NULL;
1190
1191 /* It's possible that a config has no interfaces! */
1192 if (c->desc.bNumInterfaces > 0)
1193 desc = &c->intf_cache[0]->altsetting->desc;
55c52718
AS		 1194
1195 /*
1196 * HP's USB bus-powered keyboard has only one configuration
1197 * and it claims to be self-powered; other devices may have
1198 * similar errors in their descriptors. If the next test
1199 * were allowed to execute, such configurations would always
1200 * be rejected and the devices would not work as expected.
436f5762
AS		 1201 * In the meantime, we run the risk of selecting a config
1202 * that requires external power at a time when that power
1203 * isn't available. It seems to be the lesser of two evils.
1204 *
1205 * Bugzilla #6448 reports a device that appears to crash
1206 * when it receives a GET_DEVICE_STATUS request! We don't
1207 * have any other way to tell whether a device is self-powered,
1208 * but since we don't use that information anywhere but here,
1209 * the call has been removed.
1210 *
1211 * Maybe the GET_DEVICE_STATUS call and the test below can
1212 * be reinstated when device firmwares become more reliable.
1213 * Don't hold your breath.
55c52718
AS		 1214 */
1215#if 0
1216 /* Rule out self-powered configs for a bus-powered device */
1217 if (bus_powered && (c->desc.bmAttributes &
1218 USB_CONFIG_ATT_SELFPOWER))
1219 continue;
1220#endif
1da177e4 1221
55c52718
AS		 1222 /*
1223 * The next test may not be as effective as it should be.
1224 * Some hubs have errors in their descriptor, claiming
1225 * to be self-powered when they are really bus-powered.
1226 * We will overestimate the amount of current such hubs
1227 * make available for each port.
1228 *
1229 * This is a fairly benign sort of failure. It won't
1230 * cause us to reject configurations that we should have
1231 * accepted.
1232 */
1da177e4 1233
55c52718 1234 /* Rule out configs that draw too much bus current */
1fbe75e1
DD		 1235 if (c->desc.bMaxPower * 2 > udev->bus_mA) {
1236 insufficient_power++;
55c52718 1237 continue;
1fbe75e1 1238 }
1da177e4 1239
55c52718
AS		 1240 /* If the first config's first interface is COMM/2/0xff
1241 * (MSFT RNDIS), rule it out unless Linux has host-side
1242 * RNDIS support. */
6aa35675
AS		 1243 if (i == 0 && desc
1244 && desc->bInterfaceClass == USB_CLASS_COMM
55c52718
AS		 1245 && desc->bInterfaceSubClass == 2
1246 && desc->bInterfaceProtocol == 0xff) {
3f8f4a18 1247#ifndef CONFIG_USB_NET_RNDIS_HOST
55c52718
AS		 1248 continue;
1249#else
1250 best = c;
1251#endif
1252 }
1253
1254 /* From the remaining configs, choose the first one whose
1255 * first interface is for a non-vendor-specific class.
1256 * Reason: Linux is more likely to have a class driver
1257 * than a vendor-specific driver. */
1258 else if (udev->descriptor.bDeviceClass !=
1259 USB_CLASS_VENDOR_SPEC &&
6aa35675
AS		 1260 (!desc || desc->bInterfaceClass !=
1261 USB_CLASS_VENDOR_SPEC)) {
55c52718 1262 best = c;
1da177e4
LT		 1263 break;
1264 }
55c52718
AS		 1265
1266 /* If all the remaining configs are vendor-specific,
1267 * choose the first one. */
1268 else if (!best)
1269 best = c;
1270 }
1271
1fbe75e1
DD		 1272 if (insufficient_power > 0)
1273 dev_info(&udev->dev, "rejected %d configuration%s "
1274 "due to insufficient available bus power\n",
1275 insufficient_power, plural(insufficient_power));
1276
55c52718
AS		 1277 if (best) {
1278 i = best->desc.bConfigurationValue;
1da177e4 1279 dev_info(&udev->dev,
55c52718
AS		 1280 "configuration #%d chosen from %d choice%s\n",
1281 i, num_configs, plural(num_configs));
1282 } else {
1283 i = -1;
1284 dev_warn(&udev->dev,
1285 "no configuration chosen from %d choice%s\n",
1286 num_configs, plural(num_configs));
1da177e4 1287 }
55c52718 1288 return i;
1da177e4
LT		 1289}
1290
1291#ifdef DEBUG
1292static void show_string(struct usb_device *udev, char *id, char *string)
1293{
1294 if (!string)
1295 return;
1296 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1297}
1298
1299#else
1300static inline void show_string(struct usb_device *udev, char *id, char *string)
1301{}
1302#endif
1303
1da177e4
LT		 1304
1305#ifdef CONFIG_USB_OTG
1306#include "otg_whitelist.h"
1307#endif
1308
1309/**
1310 * usb_new_device - perform initial device setup (usbcore-internal)
1311 * @udev: newly addressed device (in ADDRESS state)
1312 *
1313 * This is called with devices which have been enumerated, but not yet
1314 * configured. The device descriptor is available, but not descriptors
9ad3d6cc
AS		 1315 * for any device configuration. The caller must have locked either
1316 * the parent hub (if udev is a normal device) or else the
1da177e4
LT		 1317 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1318 * udev has already been installed, but udev is not yet visible through
1319 * sysfs or other filesystem code.
1320 *
1321 * Returns 0 for success (device is configured and listed, with its
1322 * interfaces, in sysfs); else a negative errno value.
1323 *
1324 * This call is synchronous, and may not be used in an interrupt context.
1325 *
9ad3d6cc 1326 * Only the hub driver or root-hub registrar should ever call this.
1da177e4
LT		 1327 */
1328int usb_new_device(struct usb_device *udev)
1329{
1330 int err;
1331 int c;
1332
1333 err = usb_get_configuration(udev);
1334 if (err < 0) {
1335 dev_err(&udev->dev, "can't read configurations, error %d\n",
1336 err);
1337 goto fail;
1338 }
1339
1340 /* read the standard strings and cache them if present */
4f62efe6
AS		 1341 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1342 udev->manufacturer = usb_cache_string(udev,
1343 udev->descriptor.iManufacturer);
1344 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1da177e4
LT		 1345
1346 /* Tell the world! */
1347 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1348 "SerialNumber=%d\n",
1349 udev->descriptor.iManufacturer,
1350 udev->descriptor.iProduct,
1351 udev->descriptor.iSerialNumber);
1352 show_string(udev, "Product", udev->product);
1353 show_string(udev, "Manufacturer", udev->manufacturer);
1354 show_string(udev, "SerialNumber", udev->serial);
1355
1356#ifdef CONFIG_USB_OTG
1357 /*
1358 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1359 * to wake us after we've powered off VBUS; and HNP, switching roles
1360 * "host" to "peripheral". The OTG descriptor helps figure this out.
1361 */
1362 if (!udev->bus->is_b_host
1363 && udev->config
1364 && udev->parent == udev->bus->root_hub) {
1365 struct usb_otg_descriptor *desc = 0;
1366 struct usb_bus *bus = udev->bus;
1367
1368 /* descriptor may appear anywhere in config */
1369 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1370 le16_to_cpu(udev->config[0].desc.wTotalLength),
1371 USB_DT_OTG, (void **) &desc) == 0) {
1372 if (desc->bmAttributes & USB_OTG_HNP) {
12c3da34 1373 unsigned port1 = udev->portnum;
1da177e4
LT		 1374 struct usb_device *root = udev->parent;
1375
1da177e4
LT		 1376 dev_info(&udev->dev,
1377 "Dual-Role OTG device on %sHNP port\n",
1378 (port1 == bus->otg_port)
1379 ? "" : "non-");
1380
1381 /* enable HNP before suspend, it's simpler */
1382 if (port1 == bus->otg_port)
1383 bus->b_hnp_enable = 1;
1384 err = usb_control_msg(udev,
1385 usb_sndctrlpipe(udev, 0),
1386 USB_REQ_SET_FEATURE, 0,
1387 bus->b_hnp_enable
1388 ? USB_DEVICE_B_HNP_ENABLE
1389 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1390 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1391 if (err < 0) {
1392 /* OTG MESSAGE: report errors here,
1393 * customize to match your product.
1394 */
1395 dev_info(&udev->dev,
1396 "can't set HNP mode; %d\n",
1397 err);
1398 bus->b_hnp_enable = 0;
1399 }
1400 }
1401 }
1402 }
1403
1404 if (!is_targeted(udev)) {
1405
1406 /* Maybe it can talk to us, though we can't talk to it.
1407 * (Includes HNP test device.)
1408 */
1409 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
390a8c34
DB		 1410 static int __usb_suspend_device(struct usb_device *,
1411 int port1);
1412 err = __usb_suspend_device(udev, udev->bus->otg_port);
1da177e4
LT		 1413 if (err < 0)
1414 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1415 }
1416 err = -ENODEV;
1417 goto fail;
1418 }
1419#endif
1420
1421 /* put device-specific files into sysfs */
1422 err = device_add (&udev->dev);
1423 if (err) {
1424 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1425 goto fail;
1426 }
1427 usb_create_sysfs_dev_files (udev);
1428
9ad3d6cc
AS		 1429 usb_lock_device(udev);
1430
1da177e4
LT		 1431 /* choose and set the configuration. that registers the interfaces
1432 * with the driver core, and lets usb device drivers bind to them.
1433 */
1434 c = choose_configuration(udev);
55c52718 1435 if (c >= 0) {
1da177e4
LT		 1436 err = usb_set_configuration(udev, c);
1437 if (err) {
1438 dev_err(&udev->dev, "can't set config #%d, error %d\n",
1439 c, err);
55c52718
AS		 1440 /* This need not be fatal. The user can try to
1441 * set other configurations. */
1da177e4
LT		 1442 }
1443 }
1444
1445 /* USB device state == configured ... usable */
3099e75a 1446 usb_notify_add_device(udev);
1da177e4 1447
9ad3d6cc
AS		 1448 usb_unlock_device(udev);
1449
1da177e4
LT		 1450 return 0;
1451
1452fail:
1453 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1454 return err;
1455}
1456
1457
1458static int hub_port_status(struct usb_hub *hub, int port1,
1459 u16 *status, u16 *change)
1460{
1461 int ret;
1462
1463 ret = get_port_status(hub->hdev, port1, &hub->status->port);
1464 if (ret < 0)
1465 dev_err (hub->intfdev,
1466 "%s failed (err = %d)\n", __FUNCTION__, ret);
1467 else {
1468 *status = le16_to_cpu(hub->status->port.wPortStatus);
1469 *change = le16_to_cpu(hub->status->port.wPortChange);
1470 ret = 0;
1471 }
1472 return ret;
1473}
1474
1475#define PORT_RESET_TRIES 5
1476#define SET_ADDRESS_TRIES 2
1477#define GET_DESCRIPTOR_TRIES 2
1478#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1479#define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1480
1481#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1482#define HUB_SHORT_RESET_TIME 10
1483#define HUB_LONG_RESET_TIME 200
1484#define HUB_RESET_TIMEOUT 500
1485
1486static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1487 struct usb_device *udev, unsigned int delay)
1488{
1489 int delay_time, ret;
1490 u16 portstatus;
1491 u16 portchange;
1492
1493 for (delay_time = 0;
1494 delay_time < HUB_RESET_TIMEOUT;
1495 delay_time += delay) {
1496 /* wait to give the device a chance to reset */
1497 msleep(delay);
1498
1499 /* read and decode port status */
1500 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1501 if (ret < 0)
1502 return ret;
1503
1504 /* Device went away? */
1505 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1506 return -ENOTCONN;
1507
1508 /* bomb out completely if something weird happened */
1509 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1510 return -EINVAL;
1511
1512 /* if we`ve finished resetting, then break out of the loop */
1513 if (!(portstatus & USB_PORT_STAT_RESET) &&
1514 (portstatus & USB_PORT_STAT_ENABLE)) {
1515 if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1516 udev->speed = USB_SPEED_HIGH;
1517 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1518 udev->speed = USB_SPEED_LOW;
1519 else
1520 udev->speed = USB_SPEED_FULL;
1521 return 0;
1522 }
1523
1524 /* switch to the long delay after two short delay failures */
1525 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1526 delay = HUB_LONG_RESET_TIME;
1527
1528 dev_dbg (hub->intfdev,
1529 "port %d not reset yet, waiting %dms\n",
1530 port1, delay);
1531 }
1532
1533 return -EBUSY;
1534}
1535
1536static int hub_port_reset(struct usb_hub *hub, int port1,
1537 struct usb_device *udev, unsigned int delay)
1538{
1539 int i, status;
1540
1541 /* Reset the port */
1542 for (i = 0; i < PORT_RESET_TRIES; i++) {
1543 status = set_port_feature(hub->hdev,
1544 port1, USB_PORT_FEAT_RESET);
1545 if (status)
1546 dev_err(hub->intfdev,
1547 "cannot reset port %d (err = %d)\n",
1548 port1, status);
1549 else {
1550 status = hub_port_wait_reset(hub, port1, udev, delay);
dd16525b 1551 if (status && status != -ENOTCONN)
1da177e4
LT		 1552 dev_dbg(hub->intfdev,
1553 "port_wait_reset: err = %d\n",
1554 status);
1555 }
1556
1557 /* return on disconnect or reset */
1558 switch (status) {
1559 case 0:
b789696a
DB		 1560 /* TRSTRCY = 10 ms; plus some extra */
1561 msleep(10 + 40);
1da177e4
LT		 1562 /* FALL THROUGH */
1563 case -ENOTCONN:
1564 case -ENODEV:
1565 clear_port_feature(hub->hdev,
1566 port1, USB_PORT_FEAT_C_RESET);
1567 /* FIXME need disconnect() for NOTATTACHED device */
1568 usb_set_device_state(udev, status
1569 ? USB_STATE_NOTATTACHED
1570 : USB_STATE_DEFAULT);
1571 return status;
1572 }
1573
1574 dev_dbg (hub->intfdev,
1575 "port %d not enabled, trying reset again...\n",
1576 port1);
1577 delay = HUB_LONG_RESET_TIME;
1578 }
1579
1580 dev_err (hub->intfdev,
1581 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1582 port1);
1583
1584 return status;
1585}
1586
1da177e4
LT		 1587/*
1588 * Disable a port and mark a logical connnect-change event, so that some
1589 * time later khubd will disconnect() any existing usb_device on the port
1590 * and will re-enumerate if there actually is a device attached.
1591 */
1592static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1593{
1594 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1595 hub_port_disable(hub, port1, 1);
1596
1597 /* FIXME let caller ask to power down the port:
1598 * - some devices won't enumerate without a VBUS power cycle
1599 * - SRP saves power that way
390a8c34 1600 * - ... new call, TBD ...
1da177e4
LT		 1601 * That's easy if this hub can switch power per-port, and
1602 * khubd reactivates the port later (timer, SRP, etc).
1603 * Powerdown must be optional, because of reset/DFU.
1604 */
1605
1606 set_bit(port1, hub->change_bits);
1607 kick_khubd(hub);
1608}
1609
1610
1611#ifdef CONFIG_USB_SUSPEND
1612
1613/*
1614 * Selective port suspend reduces power; most suspended devices draw
1615 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1616 * All devices below the suspended port are also suspended.
1617 *
1618 * Devices leave suspend state when the host wakes them up. Some devices
1619 * also support "remote wakeup", where the device can activate the USB
1620 * tree above them to deliver data, such as a keypress or packet. In
1621 * some cases, this wakes the USB host.
1622 */
1623static int hub_port_suspend(struct usb_hub *hub, int port1,
1624 struct usb_device *udev)
1625{
1626 int status;
1627
1628 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1629
1630 /* enable remote wakeup when appropriate; this lets the device
1631 * wake up the upstream hub (including maybe the root hub).
1632 *
1633 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1634 * we don't explicitly enable it here.
1635 */
b94dc6b5 1636 if (device_may_wakeup(&udev->dev)) {
1da177e4
LT		 1637 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1638 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1639 USB_DEVICE_REMOTE_WAKEUP, 0,
1640 NULL, 0,
1641 USB_CTRL_SET_TIMEOUT);
1642 if (status)
1643 dev_dbg(&udev->dev,
1644 "won't remote wakeup, status %d\n",
1645 status);
1646 }
1647
1648 /* see 7.1.7.6 */
1649 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1650 if (status) {
1651 dev_dbg(hub->intfdev,
1652 "can't suspend port %d, status %d\n",
1653 port1, status);
1654 /* paranoia: "should not happen" */
1655 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1656 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1657 USB_DEVICE_REMOTE_WAKEUP, 0,
1658 NULL, 0,
1659 USB_CTRL_SET_TIMEOUT);
1660 } else {
1661 /* device has up to 10 msec to fully suspend */
1662 dev_dbg(&udev->dev, "usb suspend\n");
1663 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1664 msleep(10);
1665 }
1666 return status;
1667}
1668
1669/*
1670 * Devices on USB hub ports have only one "suspend" state, corresponding
ba9d35fb 1671 * to ACPI D2, "may cause the device to lose some context".
1da177e4
LT		 1672 * State transitions include:
1673 *
1674 * - suspend, resume ... when the VBUS power link stays live
1675 * - suspend, disconnect ... VBUS lost
1676 *
1677 * Once VBUS drop breaks the circuit, the port it's using has to go through
1678 * normal re-enumeration procedures, starting with enabling VBUS power.
1679 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1680 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1681 * timer, no SRP, no requests through sysfs.
390a8c34
DB		 1682 *
1683 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1684 * the root hub for their bus goes into global suspend ... so we don't
1685 * (falsely) update the device power state to say it suspended.
1da177e4 1686 */
390a8c34 1687static int __usb_suspend_device (struct usb_device *udev, int port1)
1da177e4 1688{
f3f3253d 1689 int status = 0;
1da177e4
LT		 1690
1691 /* caller owns the udev device lock */
1692 if (port1 < 0)
1693 return port1;
1694
1695 if (udev->state == USB_STATE_SUSPENDED
1696 || udev->state == USB_STATE_NOTATTACHED) {
1697 return 0;
1698 }
1699
c9f89fa4 1700 /* all interfaces must already be suspended */
1da177e4
LT		 1701 if (udev->actconfig) {
1702 int i;
1703
1704 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1705 struct usb_interface *intf;
1da177e4
LT		 1706
1707 intf = udev->actconfig->interface[i];
c9f89fa4
DB		 1708 if (is_active(intf)) {
1709 dev_dbg(&intf->dev, "nyet suspended\n");
1710 return -EBUSY;
1da177e4
LT		 1711 }
1712 }
1713 }
1714
f3f3253d
DB		 1715 /* we only change a device's upstream USB link.
1716 * root hubs have no upstream USB link.
1da177e4 1717 */
f3f3253d 1718 if (udev->parent)
1da177e4
LT		 1719 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1720 udev);
1721
1722 if (status == 0)
390a8c34 1723 udev->dev.power.power_state = PMSG_SUSPEND;
1da177e4
LT		 1724 return status;
1725}
1726
f3f3253d
DB		 1727#endif
1728
5edbfb7c 1729/*
1da177e4
LT		 1730 * usb_suspend_device - suspend a usb device
1731 * @udev: device that's no longer in active use
5edbfb7c 1732 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1733 *
1734 * Suspends a USB device that isn't in active use, conserving power.
1735 * Devices may wake out of a suspend, if anything important happens,
1736 * using the remote wakeup mechanism. They may also be taken out of
1737 * suspend by the host, using usb_resume_device(). It's also routine
1738 * to disconnect devices while they are suspended.
1739 *
390a8c34
DB		 1740 * This only affects the USB hardware for a device; its interfaces
1741 * (and, for hubs, child devices) must already have been suspended.
1742 *
1da177e4
LT		 1743 * Suspending OTG devices may trigger HNP, if that's been enabled
1744 * between a pair of dual-role devices. That will change roles, such
1745 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1746 *
1747 * Returns 0 on success, else negative errno.
1748 */
390a8c34 1749int usb_suspend_device(struct usb_device *udev)
1da177e4 1750{
f3f3253d 1751#ifdef CONFIG_USB_SUSPEND
4bf0ba86
AS		 1752 if (udev->state == USB_STATE_NOTATTACHED)
1753 return -ENODEV;
12c3da34 1754 return __usb_suspend_device(udev, udev->portnum);
f3f3253d
DB		 1755#else
1756 /* NOTE: udev->state unchanged, it's not lying ... */
1757 udev->dev.power.power_state = PMSG_SUSPEND;
1758 return 0;
1759#endif
1da177e4 1760}
f3f3253d 1761
1da177e4 1762/*
390a8c34
DB		 1763 * If the USB "suspend" state is in use (rather than "global suspend"),
1764 * many devices will be individually taken out of suspend state using
1765 * special" resume" signaling. These routines kick in shortly after
1da177e4
LT		 1766 * hardware resume signaling is finished, either because of selective
1767 * resume (by host) or remote wakeup (by device) ... now see what changed
1768 * in the tree that's rooted at this device.
1769 */
f3f3253d 1770static int finish_device_resume(struct usb_device *udev)
1da177e4
LT		 1771{
1772 int status;
1773 u16 devstatus;
1774
1775 /* caller owns the udev device lock */
f3f3253d 1776 dev_dbg(&udev->dev, "finish resume\n");
1da177e4
LT		 1777
1778 /* usb ch9 identifies four variants of SUSPENDED, based on what
1779 * state the device resumes to. Linux currently won't see the
1780 * first two on the host side; they'd be inside hub_port_init()
1781 * during many timeouts, but khubd can't suspend until later.
1782 */
1783 usb_set_device_state(udev, udev->actconfig
1784 ? USB_STATE_CONFIGURED
1785 : USB_STATE_ADDRESS);
4bf0ba86 1786 udev->dev.power.power_state = PMSG_ON;
1da177e4
LT		 1787
1788 /* 10.5.4.5 says be sure devices in the tree are still there.
1789 * For now let's assume the device didn't go crazy on resume,
1790 * and device drivers will know about any resume quirks.
1791 */
1792 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
b40b7a90
AS		 1793 if (status >= 0)
1794 status = (status == 2 ? 0 : -ENODEV);
1795
1796 if (status)
1da177e4
LT		 1797 dev_dbg(&udev->dev,
1798 "gone after usb resume? status %d\n",
1799 status);
1800 else if (udev->actconfig) {
1801 unsigned i;
dbc3887e 1802 int (*resume)(struct device *);
1da177e4
LT		 1803
1804 le16_to_cpus(&devstatus);
55c52718 1805 if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
f3f3253d 1806 && udev->parent) {
1da177e4
LT		 1807 status = usb_control_msg(udev,
1808 usb_sndctrlpipe(udev, 0),
1809 USB_REQ_CLEAR_FEATURE,
1810 USB_RECIP_DEVICE,
1811 USB_DEVICE_REMOTE_WAKEUP, 0,
1812 NULL, 0,
1813 USB_CTRL_SET_TIMEOUT);
1814 if (status) {
1815 dev_dbg(&udev->dev, "disable remote "
1816 "wakeup, status %d\n", status);
1817 status = 0;
1818 }
1819 }
1820
1821 /* resume interface drivers; if this is a hub, it
dbc3887e 1822 * may have a child resume event to deal with soon
1da177e4 1823 */
dbc3887e 1824 resume = udev->dev.bus->resume;
4bf0ba86
AS		 1825 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1826 struct device *dev =
1827 &udev->actconfig->interface[i]->dev;
1828
1829 down(&dev->sem);
1830 (void) resume(dev);
1831 up(&dev->sem);
1832 }
1da177e4
LT		 1833 status = 0;
1834
1835 } else if (udev->devnum <= 0) {
1836 dev_dbg(&udev->dev, "bogus resume!\n");
1837 status = -EINVAL;
1838 }
1839 return status;
1840}
1841
f3f3253d
DB		 1842#ifdef CONFIG_USB_SUSPEND
1843
1da177e4
LT		 1844static int
1845hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1846{
1847 int status;
1848
1849 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1850
1851 /* see 7.1.7.7; affects power usage, but not budgeting */
1852 status = clear_port_feature(hub->hdev,
1853 port1, USB_PORT_FEAT_SUSPEND);
1854 if (status) {
1855 dev_dbg(hub->intfdev,
1856 "can't resume port %d, status %d\n",
1857 port1, status);
1858 } else {
1859 u16 devstatus;
1860 u16 portchange;
1861
1862 /* drive resume for at least 20 msec */
1863 if (udev)
1864 dev_dbg(&udev->dev, "RESUME\n");
1865 msleep(25);
1866
1867#define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1868 | USB_PORT_STAT_ENABLE \
1869 | USB_PORT_STAT_CONNECTION)
1870
1871 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1872 * stop resume signaling. Then finish the resume
1873 * sequence.
1874 */
1875 devstatus = portchange = 0;
1876 status = hub_port_status(hub, port1,
1877 &devstatus, &portchange);
1878 if (status < 0
1879 || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
1880 || (devstatus & USB_PORT_STAT_SUSPEND) != 0
1881 ) {
1882 dev_dbg(hub->intfdev,
1883 "port %d status %04x.%04x after resume, %d\n",
1884 port1, portchange, devstatus, status);
1885 } else {
1886 /* TRSMRCY = 10 msec */
1887 msleep(10);
1888 if (udev)
f3f3253d 1889 status = finish_device_resume(udev);
1da177e4
LT		 1890 }
1891 }
1892 if (status < 0)
1893 hub_port_logical_disconnect(hub, port1);
1894
1895 return status;
1896}
1897
f3f3253d 1898#endif
1da177e4 1899
5edbfb7c 1900/*
1da177e4
LT		 1901 * usb_resume_device - re-activate a suspended usb device
1902 * @udev: device to re-activate
5edbfb7c 1903 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1904 *
1905 * This will re-activate the suspended device, increasing power usage
1906 * while letting drivers communicate again with its endpoints.
1907 * USB resume explicitly guarantees that the power session between
1908 * the host and the device is the same as it was when the device
1909 * suspended.
1910 *
1911 * Returns 0 on success, else negative errno.
1912 */
1913int usb_resume_device(struct usb_device *udev)
1914{
12c3da34 1915 int status;
1da177e4 1916
4bf0ba86
AS		 1917 if (udev->state == USB_STATE_NOTATTACHED)
1918 return -ENODEV;
1da177e4 1919
f3f3253d
DB		 1920 /* selective resume of one downstream hub-to-device port */
1921 if (udev->parent) {
fb669cc0 1922#ifdef CONFIG_USB_SUSPEND
f3f3253d
DB		 1923 if (udev->state == USB_STATE_SUSPENDED) {
1924 // NOTE swsusp may bork us, device state being wrong...
1925 // NOTE this fails if parent is also suspended...
1926 status = hub_port_resume(hdev_to_hub(udev->parent),
12c3da34 1927 udev->portnum, udev);
1da177e4 1928 } else
f3f3253d 1929#endif
43c5d5aa 1930 status = 0;
fb669cc0 1931 } else
f3f3253d
DB		 1932 status = finish_device_resume(udev);
1933 if (status < 0)
1da177e4
LT		 1934 dev_dbg(&udev->dev, "can't resume, status %d\n",
1935 status);
1da177e4 1936
1da177e4 1937 /* rebind drivers that had no suspend() */
4bf0ba86
AS		 1938 if (status == 0) {
1939 usb_unlock_device(udev);
1da177e4 1940 bus_rescan_devices(&usb_bus_type);
4bf0ba86
AS		 1941 usb_lock_device(udev);
1942 }
1da177e4
LT		 1943 return status;
1944}
1945
1946static int remote_wakeup(struct usb_device *udev)
1947{
1948 int status = 0;
1949
f3f3253d
DB		 1950#ifdef CONFIG_USB_SUSPEND
1951
1da177e4
LT		 1952 /* don't repeat RESUME sequence if this device
1953 * was already woken up by some other task
1954 */
9ad3d6cc 1955 usb_lock_device(udev);
1da177e4
LT		 1956 if (udev->state == USB_STATE_SUSPENDED) {
1957 dev_dbg(&udev->dev, "RESUME (wakeup)\n");
1958 /* TRSMRCY = 10 msec */
1959 msleep(10);
f3f3253d 1960 status = finish_device_resume(udev);
1da177e4 1961 }
9ad3d6cc 1962 usb_unlock_device(udev);
f3f3253d 1963#endif
1da177e4
LT		 1964 return status;
1965}
1966
db690874 1967static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1da177e4
LT		 1968{
1969 struct usb_hub *hub = usb_get_intfdata (intf);
1970 struct usb_device *hdev = hub->hdev;
1971 unsigned port1;
1da177e4 1972
c9f89fa4 1973 /* fail if children aren't already suspended */
1da177e4
LT		 1974 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1975 struct usb_device *udev;
1976
1977 udev = hdev->children [port1-1];
f3f3253d
DB		 1978 if (udev && (udev->dev.power.power_state.event
1979 == PM_EVENT_ON
1980#ifdef CONFIG_USB_SUSPEND
1981 || udev->state != USB_STATE_SUSPENDED
1982#endif
1983 )) {
c9f89fa4
DB		 1984 dev_dbg(&intf->dev, "port %d nyet suspended\n", port1);
1985 return -EBUSY;
1986 }
1da177e4
LT		 1987 }
1988
f3f3253d
DB		 1989 /* "global suspend" of the downstream HC-to-USB interface */
1990 if (!hdev->parent) {
1991 struct usb_bus *bus = hdev->bus;
0c0382e3
AS		 1992 if (bus) {
1993 int status = hcd_bus_suspend (bus);
f3f3253d
DB		 1994
1995 if (status != 0) {
1996 dev_dbg(&hdev->dev, "'global' suspend %d\n",
1997 status);
1998 return status;
1999 }
2000 } else
2001 return -EOPNOTSUPP;
2002 }
2003
c9f89fa4
DB		 2004 /* stop khubd and related activity */
2005 hub_quiesce(hub);
1da177e4
LT		 2006 return 0;
2007}
2008
2009static int hub_resume(struct usb_interface *intf)
2010{
2011 struct usb_device *hdev = interface_to_usbdev(intf);
2012 struct usb_hub *hub = usb_get_intfdata (intf);
1da177e4
LT		 2013 int status;
2014
f3f3253d
DB		 2015 /* "global resume" of the downstream HC-to-USB interface */
2016 if (!hdev->parent) {
2017 struct usb_bus *bus = hdev->bus;
0c0382e3
AS		 2018 if (bus) {
2019 status = hcd_bus_resume (bus);
f3f3253d
DB		 2020 if (status) {
2021 dev_dbg(&intf->dev, "'global' resume %d\n",
2022 status);
2023 return status;
2024 }
2025 } else
2026 return -EOPNOTSUPP;
2027 if (status == 0) {
2028 /* TRSMRCY = 10 msec */
2029 msleep(10);
2030 }
2031 }
2032
2033 hub_activate(hub);
2034
2035 /* REVISIT: this recursion probably shouldn't exist. Remove
2036 * this code sometime, after retesting with different root and
2037 * external hubs.
2038 */
2039#ifdef CONFIG_USB_SUSPEND
2040 {
2041 unsigned port1;
2042
1da177e4
LT		 2043 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
2044 struct usb_device *udev;
2045 u16 portstat, portchange;
2046
2047 udev = hdev->children [port1-1];
2048 status = hub_port_status(hub, port1, &portstat, &portchange);
2049 if (status == 0) {
2050 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2051 clear_port_feature(hdev, port1,
2052 USB_PORT_FEAT_C_SUSPEND);
2053 portchange &= ~USB_PORT_STAT_C_SUSPEND;
2054 }
2055
2056 /* let khubd handle disconnects etc */
2057 if (portchange)
2058 continue;
2059 }
2060
2061 if (!udev || status < 0)
2062 continue;
9ad3d6cc 2063 usb_lock_device(udev);
1da177e4
LT		 2064 if (portstat & USB_PORT_STAT_SUSPEND)
2065 status = hub_port_resume(hub, port1, udev);
2066 else {
f3f3253d 2067 status = finish_device_resume(udev);
1da177e4
LT		 2068 if (status < 0) {
2069 dev_dbg(&intf->dev, "resume port %d --> %d\n",
2070 port1, status);
2071 hub_port_logical_disconnect(hub, port1);
2072 }
2073 }
9ad3d6cc 2074 usb_unlock_device(udev);
1da177e4 2075 }
f3f3253d
DB		 2076 }
2077#endif
1da177e4
LT		 2078 return 0;
2079}
2080
979d5199
DB		 2081void usb_suspend_root_hub(struct usb_device *hdev)
2082{
2083 struct usb_hub *hub = hdev_to_hub(hdev);
2084
2085 /* This also makes any led blinker stop retriggering. We're called
2086 * from irq, so the blinker might still be scheduled. Caller promises
2087 * that the root hub status URB will be canceled.
2088 */
2089 __hub_quiesce(hub);
2090 mark_quiesced(to_usb_interface(hub->intfdev));
2091}
2092
1da177e4
LT		 2093void usb_resume_root_hub(struct usb_device *hdev)
2094{
2095 struct usb_hub *hub = hdev_to_hub(hdev);
2096
2097 hub->resume_root_hub = 1;
2098 kick_khubd(hub);
2099}
2100
1da177e4
LT		 2101
2102/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2103 *
2104 * Between connect detection and reset signaling there must be a delay
2105 * of 100ms at least for debounce and power-settling. The corresponding
2106 * timer shall restart whenever the downstream port detects a disconnect.
2107 *
2108 * Apparently there are some bluetooth and irda-dongles and a number of
2109 * low-speed devices for which this debounce period may last over a second.
2110 * Not covered by the spec - but easy to deal with.
2111 *
2112 * This implementation uses a 1500ms total debounce timeout; if the
2113 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2114 * every 25ms for transient disconnects. When the port status has been
2115 * unchanged for 100ms it returns the port status.
2116 */
2117
2118#define HUB_DEBOUNCE_TIMEOUT 1500
2119#define HUB_DEBOUNCE_STEP 25
2120#define HUB_DEBOUNCE_STABLE 100
2121
2122static int hub_port_debounce(struct usb_hub *hub, int port1)
2123{
2124 int ret;
2125 int total_time, stable_time = 0;
2126 u16 portchange, portstatus;
2127 unsigned connection = 0xffff;
2128
2129 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2130 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2131 if (ret < 0)
2132 return ret;
2133
2134 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2135 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2136 stable_time += HUB_DEBOUNCE_STEP;
2137 if (stable_time >= HUB_DEBOUNCE_STABLE)
2138 break;
2139 } else {
2140 stable_time = 0;
2141 connection = portstatus & USB_PORT_STAT_CONNECTION;
2142 }
2143
2144 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2145 clear_port_feature(hub->hdev, port1,
2146 USB_PORT_FEAT_C_CONNECTION);
2147 }
2148
2149 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2150 break;
2151 msleep(HUB_DEBOUNCE_STEP);
2152 }
2153
2154 dev_dbg (hub->intfdev,
2155 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2156 port1, total_time, stable_time, portstatus);
2157
2158 if (stable_time < HUB_DEBOUNCE_STABLE)
2159 return -ETIMEDOUT;
2160 return portstatus;
2161}
2162
2163static void ep0_reinit(struct usb_device *udev)
2164{
2165 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2166 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2167 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2168}
2169
2170#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2171#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2172
2173static int hub_set_address(struct usb_device *udev)
2174{
2175 int retval;
2176
2177 if (udev->devnum == 0)
2178 return -EINVAL;
2179 if (udev->state == USB_STATE_ADDRESS)
2180 return 0;
2181 if (udev->state != USB_STATE_DEFAULT)
2182 return -EINVAL;
2183 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2184 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2185 NULL, 0, USB_CTRL_SET_TIMEOUT);
2186 if (retval == 0) {
2187 usb_set_device_state(udev, USB_STATE_ADDRESS);
2188 ep0_reinit(udev);
2189 }
2190 return retval;
2191}
2192
2193/* Reset device, (re)assign address, get device descriptor.
2194 * Device connection must be stable, no more debouncing needed.
2195 * Returns device in USB_STATE_ADDRESS, except on error.
2196 *
2197 * If this is called for an already-existing device (as part of
2198 * usb_reset_device), the caller must own the device lock. For a
2199 * newly detected device that is not accessible through any global
2200 * pointers, it's not necessary to lock the device.
2201 */
2202static int
2203hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2204 int retry_counter)
2205{
4186ecf8 2206 static DEFINE_MUTEX(usb_address0_mutex);
1da177e4
LT		 2207
2208 struct usb_device *hdev = hub->hdev;
2209 int i, j, retval;
2210 unsigned delay = HUB_SHORT_RESET_TIME;
2211 enum usb_device_speed oldspeed = udev->speed;
2212
2213 /* root hub ports have a slightly longer reset period
2214 * (from USB 2.0 spec, section 7.1.7.5)
2215 */
2216 if (!hdev->parent) {
2217 delay = HUB_ROOT_RESET_TIME;
2218 if (port1 == hdev->bus->otg_port)
2219 hdev->bus->b_hnp_enable = 0;
2220 }
2221
2222 /* Some low speed devices have problems with the quick delay, so */
2223 /* be a bit pessimistic with those devices. RHbug #23670 */
2224 if (oldspeed == USB_SPEED_LOW)
2225 delay = HUB_LONG_RESET_TIME;
2226
4186ecf8 2227 mutex_lock(&usb_address0_mutex);
1da177e4
LT		 2228
2229 /* Reset the device; full speed may morph to high speed */
2230 retval = hub_port_reset(hub, port1, udev, delay);
2231 if (retval < 0) /* error or disconnect */
2232 goto fail;
2233 /* success, speed is known */
2234 retval = -ENODEV;
2235
2236 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2237 dev_dbg(&udev->dev, "device reset changed speed!\n");
2238 goto fail;
2239 }
2240 oldspeed = udev->speed;
2241
2242 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2243 * it's fixed size except for full speed devices.
2244 */
2245 switch (udev->speed) {
2246 case USB_SPEED_HIGH: /* fixed at 64 */
2247 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2248 break;
2249 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2250 /* to determine the ep0 maxpacket size, try to read
2251 * the device descriptor to get bMaxPacketSize0 and
2252 * then correct our initial guess.
2253 */
2254 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2255 break;
2256 case USB_SPEED_LOW: /* fixed at 8 */
2257 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2258 break;
2259 default:
2260 goto fail;
2261 }
2262
2263 dev_info (&udev->dev,
2264 "%s %s speed USB device using %s and address %d\n",
2265 (udev->config) ? "reset" : "new",
2266 ({ char *speed; switch (udev->speed) {
2267 case USB_SPEED_LOW: speed = "low"; break;
2268 case USB_SPEED_FULL: speed = "full"; break;
2269 case USB_SPEED_HIGH: speed = "high"; break;
2270 default: speed = "?"; break;
2271 }; speed;}),
2272 udev->bus->controller->driver->name,
2273 udev->devnum);
2274
2275 /* Set up TT records, if needed */
2276 if (hdev->tt) {
2277 udev->tt = hdev->tt;
2278 udev->ttport = hdev->ttport;
2279 } else if (udev->speed != USB_SPEED_HIGH
2280 && hdev->speed == USB_SPEED_HIGH) {
2281 udev->tt = &hub->tt;
2282 udev->ttport = port1;
2283 }
2284
2285 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2286 * Because device hardware and firmware is sometimes buggy in
2287 * this area, and this is how Linux has done it for ages.
2288 * Change it cautiously.
2289 *
2290 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2291 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2292 * so it may help with some non-standards-compliant devices.
2293 * Otherwise we start with SET_ADDRESS and then try to read the
2294 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2295 * value.
2296 */
2297 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2298 if (USE_NEW_SCHEME(retry_counter)) {
2299 struct usb_device_descriptor *buf;
2300 int r = 0;
2301
2302#define GET_DESCRIPTOR_BUFSIZE 64
2303 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2304 if (!buf) {
2305 retval = -ENOMEM;
2306 continue;
2307 }
2308
2309 /* Use a short timeout the first time through,
2310 * so that recalcitrant full-speed devices with
2311 * 8- or 16-byte ep0-maxpackets won't slow things
2312 * down tremendously by NAKing the unexpectedly
2313 * early status stage. Also, retry on all errors;
2314 * some devices are flakey.
2315 */
2316 for (j = 0; j < 3; ++j) {
2317 buf->bMaxPacketSize0 = 0;
2318 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2319 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2320 USB_DT_DEVICE << 8, 0,
2321 buf, GET_DESCRIPTOR_BUFSIZE,
2322 (i ? USB_CTRL_GET_TIMEOUT : 1000));
2323 switch (buf->bMaxPacketSize0) {
2324 case 8: case 16: case 32: case 64:
2325 if (buf->bDescriptorType ==
2326 USB_DT_DEVICE) {
2327 r = 0;
2328 break;
2329 }
2330 /* FALL THROUGH */
2331 default:
2332 if (r == 0)
2333 r = -EPROTO;
2334 break;
2335 }
2336 if (r == 0)
2337 break;
2338 }
2339 udev->descriptor.bMaxPacketSize0 =
2340 buf->bMaxPacketSize0;
2341 kfree(buf);
2342
2343 retval = hub_port_reset(hub, port1, udev, delay);
2344 if (retval < 0) /* error or disconnect */
2345 goto fail;
2346 if (oldspeed != udev->speed) {
2347 dev_dbg(&udev->dev,
2348 "device reset changed speed!\n");
2349 retval = -ENODEV;
2350 goto fail;
2351 }
2352 if (r) {
2353 dev_err(&udev->dev, "device descriptor "
2354 "read/%s, error %d\n",
2355 "64", r);
2356 retval = -EMSGSIZE;
2357 continue;
2358 }
2359#undef GET_DESCRIPTOR_BUFSIZE
2360 }
2361
2362 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2363 retval = hub_set_address(udev);
2364 if (retval >= 0)
2365 break;
2366 msleep(200);
2367 }
2368 if (retval < 0) {
2369 dev_err(&udev->dev,
2370 "device not accepting address %d, error %d\n",
2371 udev->devnum, retval);
2372 goto fail;
2373 }
2374
2375 /* cope with hardware quirkiness:
2376 * - let SET_ADDRESS settle, some device hardware wants it
2377 * - read ep0 maxpacket even for high and low speed,
2378 */
2379 msleep(10);
2380 if (USE_NEW_SCHEME(retry_counter))
2381 break;
2382
2383 retval = usb_get_device_descriptor(udev, 8);
2384 if (retval < 8) {
2385 dev_err(&udev->dev, "device descriptor "
2386 "read/%s, error %d\n",
2387 "8", retval);
2388 if (retval >= 0)
2389 retval = -EMSGSIZE;
2390 } else {
2391 retval = 0;
2392 break;
2393 }
2394 }
2395 if (retval)
2396 goto fail;
2397
2398 i = udev->descriptor.bMaxPacketSize0;
2399 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2400 if (udev->speed != USB_SPEED_FULL ||
2401 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2402 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2403 retval = -EMSGSIZE;
2404 goto fail;
2405 }
2406 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2407 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2408 ep0_reinit(udev);
2409 }
2410
2411 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2412 if (retval < (signed)sizeof(udev->descriptor)) {
2413 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2414 "all", retval);
2415 if (retval >= 0)
2416 retval = -ENOMSG;
2417 goto fail;
2418 }
2419
2420 retval = 0;
2421
2422fail:
2423 if (retval)
2424 hub_port_disable(hub, port1, 0);
4186ecf8 2425 mutex_unlock(&usb_address0_mutex);
1da177e4
LT		 2426 return retval;
2427}
2428
2429static void
2430check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2431{
2432 struct usb_qualifier_descriptor *qual;
2433 int status;
2434
2435 qual = kmalloc (sizeof *qual, SLAB_KERNEL);
2436 if (qual == NULL)
2437 return;
2438
2439 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2440 qual, sizeof *qual);
2441 if (status == sizeof *qual) {
2442 dev_info(&udev->dev, "not running at top speed; "
2443 "connect to a high speed hub\n");
2444 /* hub LEDs are probably harder to miss than syslog */
2445 if (hub->has_indicators) {
2446 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2447 schedule_work (&hub->leds);
2448 }
2449 }
1bc3c9e1 2450 kfree(qual);
1da177e4
LT		 2451}
2452
2453static unsigned
2454hub_power_remaining (struct usb_hub *hub)
2455{
2456 struct usb_device *hdev = hub->hdev;
2457 int remaining;
55c52718 2458 int port1;
1da177e4 2459
55c52718 2460 if (!hub->limited_power)
1da177e4
LT		 2461 return 0;
2462
55c52718
AS		 2463 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2464 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2465 struct usb_device *udev = hdev->children[port1 - 1];
2466 int delta;
1da177e4
LT		 2467
2468 if (!udev)
2469 continue;
2470
55c52718
AS		 2471 /* Unconfigured devices may not use more than 100mA,
2472 * or 8mA for OTG ports */
1da177e4 2473 if (udev->actconfig)
55c52718
AS		 2474 delta = udev->actconfig->desc.bMaxPower * 2;
2475 else if (port1 != udev->bus->otg_port || hdev->parent)
2476 delta = 100;
1da177e4 2477 else
55c52718
AS		 2478 delta = 8;
2479 if (delta > hub->mA_per_port)
2480 dev_warn(&udev->dev, "%dmA is over %umA budget "
2481 "for port %d!\n",
2482 delta, hub->mA_per_port, port1);
1da177e4
LT		 2483 remaining -= delta;
2484 }
2485 if (remaining < 0) {
55c52718
AS		 2486 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2487 - remaining);
1da177e4
LT		 2488 remaining = 0;
2489 }
2490 return remaining;
2491}
2492
2493/* Handle physical or logical connection change events.
2494 * This routine is called when:
2495 * a port connection-change occurs;
2496 * a port enable-change occurs (often caused by EMI);
2497 * usb_reset_device() encounters changed descriptors (as from
2498 * a firmware download)
2499 * caller already locked the hub
2500 */
2501static void hub_port_connect_change(struct usb_hub *hub, int port1,
2502 u16 portstatus, u16 portchange)
2503{
2504 struct usb_device *hdev = hub->hdev;
2505 struct device *hub_dev = hub->intfdev;
74ad9bd2 2506 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4
LT		 2507 int status, i;
2508
2509 dev_dbg (hub_dev,
2510 "port %d, status %04x, change %04x, %s\n",
2511 port1, portstatus, portchange, portspeed (portstatus));
2512
2513 if (hub->has_indicators) {
2514 set_port_led(hub, port1, HUB_LED_AUTO);
2515 hub->indicator[port1-1] = INDICATOR_AUTO;
2516 }
2517
2518 /* Disconnect any existing devices under this port */
2519 if (hdev->children[port1-1])
2520 usb_disconnect(&hdev->children[port1-1]);
2521 clear_bit(port1, hub->change_bits);
2522
2523#ifdef CONFIG_USB_OTG
2524 /* during HNP, don't repeat the debounce */
2525 if (hdev->bus->is_b_host)
2526 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2527#endif
2528
2529 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2530 status = hub_port_debounce(hub, port1);
2531 if (status < 0) {
2532 dev_err (hub_dev,
2533 "connect-debounce failed, port %d disabled\n",
2534 port1);
2535 goto done;
2536 }
2537 portstatus = status;
2538 }
2539
2540 /* Return now if nothing is connected */
2541 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2542
2543 /* maybe switch power back on (e.g. root hub was reset) */
74ad9bd2 2544 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
1da177e4
LT		 2545 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2546 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2547
2548 if (portstatus & USB_PORT_STAT_ENABLE)
2549 goto done;
2550 return;
2551 }
2552
2553#ifdef CONFIG_USB_SUSPEND
2554 /* If something is connected, but the port is suspended, wake it up. */
2555 if (portstatus & USB_PORT_STAT_SUSPEND) {
2556 status = hub_port_resume(hub, port1, NULL);
2557 if (status < 0) {
2558 dev_dbg(hub_dev,
2559 "can't clear suspend on port %d; %d\n",
2560 port1, status);
2561 goto done;
2562 }
2563 }
2564#endif
2565
2566 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2567 struct usb_device *udev;
2568
2569 /* reallocate for each attempt, since references
2570 * to the previous one can escape in various ways
2571 */
2572 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2573 if (!udev) {
2574 dev_err (hub_dev,
2575 "couldn't allocate port %d usb_device\n",
2576 port1);
2577 goto done;
2578 }
2579
2580 usb_set_device_state(udev, USB_STATE_POWERED);
2581 udev->speed = USB_SPEED_UNKNOWN;
55c52718
AS		 2582 udev->bus_mA = hub->mA_per_port;
2583
1da177e4
LT		 2584 /* set the address */
2585 choose_address(udev);
2586 if (udev->devnum <= 0) {
2587 status = -ENOTCONN; /* Don't retry */
2588 goto loop;
2589 }
2590
2591 /* reset and get descriptor */
2592 status = hub_port_init(hub, udev, port1, i);
2593 if (status < 0)
2594 goto loop;
2595
2596 /* consecutive bus-powered hubs aren't reliable; they can
2597 * violate the voltage drop budget. if the new child has
2598 * a "powered" LED, users should notice we didn't enable it
2599 * (without reading syslog), even without per-port LEDs
2600 * on the parent.
2601 */
2602 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
55c52718 2603 && udev->bus_mA <= 100) {
1da177e4
LT		 2604 u16 devstat;
2605
2606 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2607 &devstat);
55c52718 2608 if (status < 2) {
1da177e4
LT		 2609 dev_dbg(&udev->dev, "get status %d ?\n", status);
2610 goto loop_disable;
2611 }
55c52718 2612 le16_to_cpus(&devstat);
1da177e4
LT		 2613 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2614 dev_err(&udev->dev,
2615 "can't connect bus-powered hub "
2616 "to this port\n");
2617 if (hub->has_indicators) {
2618 hub->indicator[port1-1] =
2619 INDICATOR_AMBER_BLINK;
2620 schedule_work (&hub->leds);
2621 }
2622 status = -ENOTCONN; /* Don't retry */
2623 goto loop_disable;
2624 }
2625 }
2626
2627 /* check for devices running slower than they could */
2628 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2629 && udev->speed == USB_SPEED_FULL
2630 && highspeed_hubs != 0)
2631 check_highspeed (hub, udev, port1);
2632
2633 /* Store the parent's children[] pointer. At this point
2634 * udev becomes globally accessible, although presumably
2635 * no one will look at it until hdev is unlocked.
2636 */
1da177e4
LT		 2637 status = 0;
2638
2639 /* We mustn't add new devices if the parent hub has
2640 * been disconnected; we would race with the
2641 * recursively_mark_NOTATTACHED() routine.
2642 */
2643 spin_lock_irq(&device_state_lock);
2644 if (hdev->state == USB_STATE_NOTATTACHED)
2645 status = -ENOTCONN;
2646 else
2647 hdev->children[port1-1] = udev;
2648 spin_unlock_irq(&device_state_lock);
2649
2650 /* Run it through the hoops (find a driver, etc) */
2651 if (!status) {
2652 status = usb_new_device(udev);
2653 if (status) {
2654 spin_lock_irq(&device_state_lock);
2655 hdev->children[port1-1] = NULL;
2656 spin_unlock_irq(&device_state_lock);
2657 }
2658 }
2659
1da177e4
LT		 2660 if (status)
2661 goto loop_disable;
2662
2663 status = hub_power_remaining(hub);
2664 if (status)
55c52718 2665 dev_dbg(hub_dev, "%dmA power budget left\n", status);
1da177e4
LT		 2666
2667 return;
2668
2669loop_disable:
2670 hub_port_disable(hub, port1, 1);
2671loop:
2672 ep0_reinit(udev);
2673 release_address(udev);
2674 usb_put_dev(udev);
2675 if (status == -ENOTCONN)
2676 break;
2677 }
2678
2679done:
2680 hub_port_disable(hub, port1, 1);
2681}
2682
2683static void hub_events(void)
2684{
2685 struct list_head *tmp;
2686 struct usb_device *hdev;
2687 struct usb_interface *intf;
2688 struct usb_hub *hub;
2689 struct device *hub_dev;
2690 u16 hubstatus;
2691 u16 hubchange;
2692 u16 portstatus;
2693 u16 portchange;
2694 int i, ret;
2695 int connect_change;
2696
2697 /*
2698 * We restart the list every time to avoid a deadlock with
2699 * deleting hubs downstream from this one. This should be
2700 * safe since we delete the hub from the event list.
2701 * Not the most efficient, but avoids deadlocks.
2702 */
2703 while (1) {
2704
2705 /* Grab the first entry at the beginning of the list */
2706 spin_lock_irq(&hub_event_lock);
2707 if (list_empty(&hub_event_list)) {
2708 spin_unlock_irq(&hub_event_lock);
2709 break;
2710 }
2711
2712 tmp = hub_event_list.next;
2713 list_del_init(tmp);
2714
2715 hub = list_entry(tmp, struct usb_hub, event_list);
2716 hdev = hub->hdev;
2717 intf = to_usb_interface(hub->intfdev);
2718 hub_dev = &intf->dev;
2719
979d5199
DB		 2720 i = hub->resume_root_hub;
2721
2722 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n",
1da177e4
LT		 2723 hdev->state, hub->descriptor
2724 ? hub->descriptor->bNbrPorts
2725 : 0,
2726 /* NOTE: expects max 15 ports... */
2727 (u16) hub->change_bits[0],
979d5199
DB		 2728 (u16) hub->event_bits[0],
2729 i ? ", resume root" : "");
1da177e4
LT		 2730
2731 usb_get_intf(intf);
1da177e4
LT		 2732 spin_unlock_irq(&hub_event_lock);
2733
979d5199
DB		 2734 /* Is this is a root hub wanting to reactivate the downstream
2735 * ports? If so, be sure the interface resumes even if its
2736 * stub "device" node was never suspended.
2737 */
2738 if (i) {
979d5199
DB		 2739 dpm_runtime_resume(&hdev->dev);
2740 dpm_runtime_resume(&intf->dev);
2425e9fe
AS		 2741 usb_put_intf(intf);
2742 continue;
979d5199 2743 }
1da177e4
LT		 2744
2745 /* Lock the device, then check to see if we were
2746 * disconnected while waiting for the lock to succeed. */
2747 if (locktree(hdev) < 0) {
2748 usb_put_intf(intf);
2749 continue;
2750 }
2751 if (hub != usb_get_intfdata(intf))
2752 goto loop;
2753
2754 /* If the hub has died, clean up after it */
2755 if (hdev->state == USB_STATE_NOTATTACHED) {
7de18d8b
AS		 2756 hub->error = -ENODEV;
2757 hub_pre_reset(intf);
1da177e4
LT		 2758 goto loop;
2759 }
2760
2761 /* If this is an inactive or suspended hub, do nothing */
2762 if (hub->quiescing)
2763 goto loop;
2764
2765 if (hub->error) {
2766 dev_dbg (hub_dev, "resetting for error %d\n",
2767 hub->error);
2768
7de18d8b 2769 ret = usb_reset_composite_device(hdev, intf);
1da177e4
LT		 2770 if (ret) {
2771 dev_dbg (hub_dev,
2772 "error resetting hub: %d\n", ret);
2773 goto loop;
2774 }
2775
2776 hub->nerrors = 0;
2777 hub->error = 0;
2778 }
2779
2780 /* deal with port status changes */
2781 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2782 if (test_bit(i, hub->busy_bits))
2783 continue;
2784 connect_change = test_bit(i, hub->change_bits);
2785 if (!test_and_clear_bit(i, hub->event_bits) &&
2786 !connect_change && !hub->activating)
2787 continue;
2788
2789 ret = hub_port_status(hub, i,
2790 &portstatus, &portchange);
2791 if (ret < 0)
2792 continue;
2793
2794 if (hub->activating && !hdev->children[i-1] &&
2795 (portstatus &
2796 USB_PORT_STAT_CONNECTION))
2797 connect_change = 1;
2798
2799 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2800 clear_port_feature(hdev, i,
2801 USB_PORT_FEAT_C_CONNECTION);
2802 connect_change = 1;
2803 }
2804
2805 if (portchange & USB_PORT_STAT_C_ENABLE) {
2806 if (!connect_change)
2807 dev_dbg (hub_dev,
2808 "port %d enable change, "
2809 "status %08x\n",
2810 i, portstatus);
2811 clear_port_feature(hdev, i,
2812 USB_PORT_FEAT_C_ENABLE);
2813
2814 /*
2815 * EM interference sometimes causes badly
2816 * shielded USB devices to be shutdown by
2817 * the hub, this hack enables them again.
2818 * Works at least with mouse driver.
2819 */
2820 if (!(portstatus & USB_PORT_STAT_ENABLE)
2821 && !connect_change
2822 && hdev->children[i-1]) {
2823 dev_err (hub_dev,
2824 "port %i "
2825 "disabled by hub (EMI?), "
2826 "re-enabling...\n",
2827 i);
2828 connect_change = 1;
2829 }
2830 }
2831
2832 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2833 clear_port_feature(hdev, i,
2834 USB_PORT_FEAT_C_SUSPEND);
2835 if (hdev->children[i-1]) {
2836 ret = remote_wakeup(hdev->
2837 children[i-1]);
2838 if (ret < 0)
2839 connect_change = 1;
2840 } else {
2841 ret = -ENODEV;
2842 hub_port_disable(hub, i, 1);
2843 }
2844 dev_dbg (hub_dev,
2845 "resume on port %d, status %d\n",
2846 i, ret);
2847 }
2848
2849 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2850 dev_err (hub_dev,
2851 "over-current change on port %d\n",
2852 i);
2853 clear_port_feature(hdev, i,
2854 USB_PORT_FEAT_C_OVER_CURRENT);
2855 hub_power_on(hub);
2856 }
2857
2858 if (portchange & USB_PORT_STAT_C_RESET) {
2859 dev_dbg (hub_dev,
2860 "reset change on port %d\n",
2861 i);
2862 clear_port_feature(hdev, i,
2863 USB_PORT_FEAT_C_RESET);
2864 }
2865
2866 if (connect_change)
2867 hub_port_connect_change(hub, i,
2868 portstatus, portchange);
2869 } /* end for i */
2870
2871 /* deal with hub status changes */
2872 if (test_and_clear_bit(0, hub->event_bits) == 0)
2873 ; /* do nothing */
2874 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2875 dev_err (hub_dev, "get_hub_status failed\n");
2876 else {
2877 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2878 dev_dbg (hub_dev, "power change\n");
2879 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
55c52718
AS		 2880 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2881 /* FIXME: Is this always true? */
2882 hub->limited_power = 0;
2883 else
2884 hub->limited_power = 1;
1da177e4
LT		 2885 }
2886 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2887 dev_dbg (hub_dev, "overcurrent change\n");
2888 msleep(500); /* Cool down */
2889 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2890 hub_power_on(hub);
2891 }
2892 }
2893
2894 hub->activating = 0;
2895
d5926ae7
AS		 2896 /* If this is a root hub, tell the HCD it's okay to
2897 * re-enable port-change interrupts now. */
2898 if (!hdev->parent)
2899 usb_enable_root_hub_irq(hdev->bus);
2900
1da177e4
LT		 2901loop:
2902 usb_unlock_device(hdev);
2903 usb_put_intf(intf);
2904
2905 } /* end while (1) */
2906}
2907
2908static int hub_thread(void *__unused)
2909{
1da177e4
LT		 2910 do {
2911 hub_events();
9c8d6178 2912 wait_event_interruptible(khubd_wait,
2913 !list_empty(&hub_event_list) ||
2914 kthread_should_stop());
3e1d1d28 2915 try_to_freeze();
9c8d6178 2916 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
1da177e4 2917
9c8d6178 2918 pr_debug("%s: khubd exiting\n", usbcore_name);
2919 return 0;
1da177e4
LT		 2920}
2921
2922static struct usb_device_id hub_id_table [] = {
2923 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2924 .bDeviceClass = USB_CLASS_HUB},
2925 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2926 .bInterfaceClass = USB_CLASS_HUB},
2927 { } /* Terminating entry */
2928};
2929
2930MODULE_DEVICE_TABLE (usb, hub_id_table);
2931
2932static struct usb_driver hub_driver = {
1da177e4
LT		 2933 .name = "hub",
2934 .probe = hub_probe,
2935 .disconnect = hub_disconnect,
2936 .suspend = hub_suspend,
2937 .resume = hub_resume,
7de18d8b
AS		 2938 .pre_reset = hub_pre_reset,
2939 .post_reset = hub_post_reset,
1da177e4
LT		 2940 .ioctl = hub_ioctl,
2941 .id_table = hub_id_table,
2942};
2943
2944int usb_hub_init(void)
2945{
1da177e4
LT		 2946 if (usb_register(&hub_driver) < 0) {
2947 printk(KERN_ERR "%s: can't register hub driver\n",
2948 usbcore_name);
2949 return -1;
2950 }
2951
9c8d6178 2952 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2953 if (!IS_ERR(khubd_task))
1da177e4 2954 return 0;
1da177e4
LT		 2955
2956 /* Fall through if kernel_thread failed */
2957 usb_deregister(&hub_driver);
2958 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2959
2960 return -1;
2961}
2962
2963void usb_hub_cleanup(void)
2964{
9c8d6178 2965 kthread_stop(khubd_task);
1da177e4
LT		 2966
2967 /*
2968 * Hub resources are freed for us by usb_deregister. It calls
2969 * usb_driver_purge on every device which in turn calls that
2970 * devices disconnect function if it is using this driver.
2971 * The hub_disconnect function takes care of releasing the
2972 * individual hub resources. -greg
2973 */
2974 usb_deregister(&hub_driver);
2975} /* usb_hub_cleanup() */
2976
1da177e4
LT		 2977static int config_descriptors_changed(struct usb_device *udev)
2978{
2979 unsigned index;
2980 unsigned len = 0;
2981 struct usb_config_descriptor *buf;
2982
2983 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2984 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2985 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2986 }
2987 buf = kmalloc (len, SLAB_KERNEL);
2988 if (buf == NULL) {
2989 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2990 /* assume the worst */
2991 return 1;
2992 }
2993 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2994 int length;
2995 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2996
2997 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2998 old_length);
2999 if (length < old_length) {
3000 dev_dbg(&udev->dev, "config index %d, error %d\n",
3001 index, length);
3002 break;
3003 }
3004 if (memcmp (buf, udev->rawdescriptors[index], old_length)
3005 != 0) {
3006 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
3007 index, buf->bConfigurationValue);
3008 break;
3009 }
3010 }
3011 kfree(buf);
3012 return index != udev->descriptor.bNumConfigurations;
3013}
3014
3015/**
3016 * usb_reset_device - perform a USB port reset to reinitialize a device
3017 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3018 *
79efa097
AS		 3019 * WARNING - don't use this routine to reset a composite device
3020 * (one with multiple interfaces owned by separate drivers)!
3021 * Use usb_reset_composite_device() instead.
1da177e4
LT		 3022 *
3023 * Do a port reset, reassign the device's address, and establish its
3024 * former operating configuration. If the reset fails, or the device's
3025 * descriptors change from their values before the reset, or the original
3026 * configuration and altsettings cannot be restored, a flag will be set
3027 * telling khubd to pretend the device has been disconnected and then
3028 * re-connected. All drivers will be unbound, and the device will be
3029 * re-enumerated and probed all over again.
3030 *
3031 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3032 * flagged for logical disconnection, or some other negative error code
3033 * if the reset wasn't even attempted.
3034 *
3035 * The caller must own the device lock. For example, it's safe to use
3036 * this from a driver probe() routine after downloading new firmware.
3037 * For calls that might not occur during probe(), drivers should lock
3038 * the device using usb_lock_device_for_reset().
3039 */
3040int usb_reset_device(struct usb_device *udev)
3041{
3042 struct usb_device *parent_hdev = udev->parent;
3043 struct usb_hub *parent_hub;
3044 struct usb_device_descriptor descriptor = udev->descriptor;
12c3da34
AS		 3045 int i, ret = 0;
3046 int port1 = udev->portnum;
1da177e4
LT		 3047
3048 if (udev->state == USB_STATE_NOTATTACHED ||
3049 udev->state == USB_STATE_SUSPENDED) {
3050 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3051 udev->state);
3052 return -EINVAL;
3053 }
3054
3055 if (!parent_hdev) {
3056 /* this requires hcd-specific logic; see OHCI hc_restart() */
3057 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
3058 return -EISDIR;
3059 }
1da177e4
LT		 3060 parent_hub = hdev_to_hub(parent_hdev);
3061
1da177e4
LT		 3062 set_bit(port1, parent_hub->busy_bits);
3063 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
3064
3065 /* ep0 maxpacket size may change; let the HCD know about it.
3066 * Other endpoints will be handled by re-enumeration. */
3067 ep0_reinit(udev);
3068 ret = hub_port_init(parent_hub, udev, port1, i);
3069 if (ret >= 0)
3070 break;
3071 }
3072 clear_bit(port1, parent_hub->busy_bits);
3073 if (ret < 0)
3074 goto re_enumerate;
3075
3076 /* Device might have changed firmware (DFU or similar) */
3077 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
3078 || config_descriptors_changed (udev)) {
3079 dev_info(&udev->dev, "device firmware changed\n");
3080 udev->descriptor = descriptor; /* for disconnect() calls */
3081 goto re_enumerate;
3082 }
3083
3084 if (!udev->actconfig)
3085 goto done;
3086
3087 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3088 USB_REQ_SET_CONFIGURATION, 0,
3089 udev->actconfig->desc.bConfigurationValue, 0,
3090 NULL, 0, USB_CTRL_SET_TIMEOUT);
3091 if (ret < 0) {
3092 dev_err(&udev->dev,
3093 "can't restore configuration #%d (error=%d)\n",
3094 udev->actconfig->desc.bConfigurationValue, ret);
3095 goto re_enumerate;
3096 }
3097 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3098
3099 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3100 struct usb_interface *intf = udev->actconfig->interface[i];
3101 struct usb_interface_descriptor *desc;
3102
3103 /* set_interface resets host side toggle even
3104 * for altsetting zero. the interface may have no driver.
3105 */
3106 desc = &intf->cur_altsetting->desc;
3107 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3108 desc->bAlternateSetting);
3109 if (ret < 0) {
3110 dev_err(&udev->dev, "failed to restore interface %d "
3111 "altsetting %d (error=%d)\n",
3112 desc->bInterfaceNumber,
3113 desc->bAlternateSetting,
3114 ret);
3115 goto re_enumerate;
3116 }
3117 }
3118
3119done:
1da177e4
LT		 3120 return 0;
3121
3122re_enumerate:
3123 hub_port_logical_disconnect(parent_hub, port1);
3124 return -ENODEV;
3125}
79efa097
AS		 3126
3127/**
3128 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3129 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3130 * @iface: interface bound to the driver making the request (optional)
3131 *
3132 * Warns all drivers bound to registered interfaces (using their pre_reset
3133 * method), performs the port reset, and then lets the drivers know that
3134 * the reset is over (using their post_reset method).
3135 *
3136 * Return value is the same as for usb_reset_device().
3137 *
3138 * The caller must own the device lock. For example, it's safe to use
3139 * this from a driver probe() routine after downloading new firmware.
3140 * For calls that might not occur during probe(), drivers should lock
3141 * the device using usb_lock_device_for_reset().
3142 *
3143 * The interface locks are acquired during the pre_reset stage and released
3144 * during the post_reset stage. However if iface is not NULL and is
3145 * currently being probed, we assume that the caller already owns its
3146 * lock.
3147 */
3148int usb_reset_composite_device(struct usb_device *udev,
3149 struct usb_interface *iface)
3150{
3151 int ret;
3152 struct usb_host_config *config = udev->actconfig;
3153
3154 if (udev->state == USB_STATE_NOTATTACHED ||
3155 udev->state == USB_STATE_SUSPENDED) {
3156 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3157 udev->state);
3158 return -EINVAL;
3159 }
3160
3161 if (iface && iface->condition != USB_INTERFACE_BINDING)
3162 iface = NULL;
3163
3164 if (config) {
3165 int i;
3166 struct usb_interface *cintf;
3167 struct usb_driver *drv;
3168
3169 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3170 cintf = config->interface[i];
3171 if (cintf != iface)
3172 down(&cintf->dev.sem);
3173 if (device_is_registered(&cintf->dev) &&
3174 cintf->dev.driver) {
3175 drv = to_usb_driver(cintf->dev.driver);
3176 if (drv->pre_reset)
3177 (drv->pre_reset)(cintf);
3178 }
3179 }
3180 }
3181
3182 ret = usb_reset_device(udev);
3183
3184 if (config) {
3185 int i;
3186 struct usb_interface *cintf;
3187 struct usb_driver *drv;
3188
3189 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3190 cintf = config->interface[i];
3191 if (device_is_registered(&cintf->dev) &&
3192 cintf->dev.driver) {
3193 drv = to_usb_driver(cintf->dev.driver);
3194 if (drv->post_reset)
3195 (drv->post_reset)(cintf);
3196 }
3197 if (cintf != iface)
3198 up(&cintf->dev.sem);
3199 }
3200 }
3201
3202 return ret;
3203}
Linux kernel - Deliverables
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