projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
USB: remove __usb_port_suspend
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / core / hub.c
CommitLineData
1da177e4
LT		 1/*
2 * USB hub driver.
3 *
4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
8 *
9 */
10
1da177e4
LT		 11#include <linux/kernel.h>
12#include <linux/errno.h>
13#include <linux/module.h>
14#include <linux/moduleparam.h>
15#include <linux/completion.h>
16#include <linux/sched.h>
17#include <linux/list.h>
18#include <linux/slab.h>
1da177e4
LT		 19#include <linux/ioctl.h>
20#include <linux/usb.h>
21#include <linux/usbdevice_fs.h>
9c8d6178 22#include <linux/kthread.h>
4186ecf8 23#include <linux/mutex.h>
7dfb7103 24#include <linux/freezer.h>
1da177e4
LT		 25
26#include <asm/semaphore.h>
27#include <asm/uaccess.h>
28#include <asm/byteorder.h>
29
30#include "usb.h"
31#include "hcd.h"
32#include "hub.h"
33
1bb5f66b
AS		 34struct usb_hub {
35 struct device *intfdev; /* the "interface" device */
36 struct usb_device *hdev;
e8054854 37 struct kref kref;
1bb5f66b
AS		 38 struct urb *urb; /* for interrupt polling pipe */
39
40 /* buffer for urb ... with extra space in case of babble */
41 char (*buffer)[8];
42 dma_addr_t buffer_dma; /* DMA address for buffer */
43 union {
44 struct usb_hub_status hub;
45 struct usb_port_status port;
46 } *status; /* buffer for status reports */
db90e7a1 47 struct mutex status_mutex; /* for the status buffer */
1bb5f66b
AS		 48
49 int error; /* last reported error */
50 int nerrors; /* track consecutive errors */
51
52 struct list_head event_list; /* hubs w/data or errs ready */
53 unsigned long event_bits[1]; /* status change bitmask */
54 unsigned long change_bits[1]; /* ports with logical connect
55 status change */
56 unsigned long busy_bits[1]; /* ports being reset or
57 resumed */
58#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
59#error event_bits[] is too short!
60#endif
61
62 struct usb_hub_descriptor *descriptor; /* class descriptor */
63 struct usb_tt tt; /* Transaction Translator */
64
65 unsigned mA_per_port; /* current for each child */
66
67 unsigned limited_power:1;
68 unsigned quiescing:1;
69 unsigned activating:1;
e8054854 70 unsigned disconnected:1;
1bb5f66b
AS		 71
72 unsigned has_indicators:1;
73 u8 indicator[USB_MAXCHILDREN];
6d5aefb8 74 struct delayed_work leds;
1bb5f66b
AS		 75};
76
77
1da177e4 78/* Protect struct usb_device->state and ->children members
9ad3d6cc 79 * Note: Both are also protected by ->dev.sem, except that ->state can
1da177e4
LT		 80 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
81static DEFINE_SPINLOCK(device_state_lock);
82
83/* khubd's worklist and its lock */
84static DEFINE_SPINLOCK(hub_event_lock);
85static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
86
87/* Wakes up khubd */
88static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
89
9c8d6178 90static struct task_struct *khubd_task;
1da177e4
LT		 91
92/* cycle leds on hubs that aren't blinking for attention */
93static int blinkenlights = 0;
94module_param (blinkenlights, bool, S_IRUGO);
95MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
96
97/*
98 * As of 2.6.10 we introduce a new USB device initialization scheme which
99 * closely resembles the way Windows works. Hopefully it will be compatible
100 * with a wider range of devices than the old scheme. However some previously
101 * working devices may start giving rise to "device not accepting address"
102 * errors; if that happens the user can try the old scheme by adjusting the
103 * following module parameters.
104 *
105 * For maximum flexibility there are two boolean parameters to control the
106 * hub driver's behavior. On the first initialization attempt, if the
107 * "old_scheme_first" parameter is set then the old scheme will be used,
108 * otherwise the new scheme is used. If that fails and "use_both_schemes"
109 * is set, then the driver will make another attempt, using the other scheme.
110 */
111static int old_scheme_first = 0;
112module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
113MODULE_PARM_DESC(old_scheme_first,
114 "start with the old device initialization scheme");
115
116static int use_both_schemes = 1;
117module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
118MODULE_PARM_DESC(use_both_schemes,
119 "try the other device initialization scheme if the "
120 "first one fails");
121
122
404d5b18 123static inline char *portspeed(int portstatus)
1da177e4
LT		 124{
125 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
126 return "480 Mb/s";
127 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
128 return "1.5 Mb/s";
129 else
130 return "12 Mb/s";
131}
1da177e4
LT		 132
133/* Note that hdev or one of its children must be locked! */
134static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
135{
136 return usb_get_intfdata(hdev->actconfig->interface[0]);
137}
138
139/* USB 2.0 spec Section 11.24.4.5 */
140static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
141{
142 int i, ret;
143
144 for (i = 0; i < 3; i++) {
145 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
146 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
147 USB_DT_HUB << 8, 0, data, size,
148 USB_CTRL_GET_TIMEOUT);
149 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
150 return ret;
151 }
152 return -EINVAL;
153}
154
155/*
156 * USB 2.0 spec Section 11.24.2.1
157 */
158static int clear_hub_feature(struct usb_device *hdev, int feature)
159{
160 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
161 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
162}
163
164/*
165 * USB 2.0 spec Section 11.24.2.2
166 */
167static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
168{
169 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
170 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
171 NULL, 0, 1000);
172}
173
174/*
175 * USB 2.0 spec Section 11.24.2.13
176 */
177static int set_port_feature(struct usb_device *hdev, int port1, int feature)
178{
179 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
180 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
181 NULL, 0, 1000);
182}
183
184/*
185 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
186 * for info about using port indicators
187 */
188static void set_port_led(
189 struct usb_hub *hub,
190 int port1,
191 int selector
192)
193{
194 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
195 USB_PORT_FEAT_INDICATOR);
196 if (status < 0)
197 dev_dbg (hub->intfdev,
198 "port %d indicator %s status %d\n",
199 port1,
200 ({ char *s; switch (selector) {
201 case HUB_LED_AMBER: s = "amber"; break;
202 case HUB_LED_GREEN: s = "green"; break;
203 case HUB_LED_OFF: s = "off"; break;
204 case HUB_LED_AUTO: s = "auto"; break;
205 default: s = "??"; break;
206 }; s; }),
207 status);
208}
209
210#define LED_CYCLE_PERIOD ((2*HZ)/3)
211
c4028958 212static void led_work (struct work_struct *work)
1da177e4 213{
c4028958
DH		 214 struct usb_hub *hub =
215 container_of(work, struct usb_hub, leds.work);
1da177e4
LT		 216 struct usb_device *hdev = hub->hdev;
217 unsigned i;
218 unsigned changed = 0;
219 int cursor = -1;
220
221 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
222 return;
223
224 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
225 unsigned selector, mode;
226
227 /* 30%-50% duty cycle */
228
229 switch (hub->indicator[i]) {
230 /* cycle marker */
231 case INDICATOR_CYCLE:
232 cursor = i;
233 selector = HUB_LED_AUTO;
234 mode = INDICATOR_AUTO;
235 break;
236 /* blinking green = sw attention */
237 case INDICATOR_GREEN_BLINK:
238 selector = HUB_LED_GREEN;
239 mode = INDICATOR_GREEN_BLINK_OFF;
240 break;
241 case INDICATOR_GREEN_BLINK_OFF:
242 selector = HUB_LED_OFF;
243 mode = INDICATOR_GREEN_BLINK;
244 break;
245 /* blinking amber = hw attention */
246 case INDICATOR_AMBER_BLINK:
247 selector = HUB_LED_AMBER;
248 mode = INDICATOR_AMBER_BLINK_OFF;
249 break;
250 case INDICATOR_AMBER_BLINK_OFF:
251 selector = HUB_LED_OFF;
252 mode = INDICATOR_AMBER_BLINK;
253 break;
254 /* blink green/amber = reserved */
255 case INDICATOR_ALT_BLINK:
256 selector = HUB_LED_GREEN;
257 mode = INDICATOR_ALT_BLINK_OFF;
258 break;
259 case INDICATOR_ALT_BLINK_OFF:
260 selector = HUB_LED_AMBER;
261 mode = INDICATOR_ALT_BLINK;
262 break;
263 default:
264 continue;
265 }
266 if (selector != HUB_LED_AUTO)
267 changed = 1;
268 set_port_led(hub, i + 1, selector);
269 hub->indicator[i] = mode;
270 }
271 if (!changed && blinkenlights) {
272 cursor++;
273 cursor %= hub->descriptor->bNbrPorts;
274 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
275 hub->indicator[cursor] = INDICATOR_CYCLE;
276 changed++;
277 }
278 if (changed)
279 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
280}
281
282/* use a short timeout for hub/port status fetches */
283#define USB_STS_TIMEOUT 1000
284#define USB_STS_RETRIES 5
285
286/*
287 * USB 2.0 spec Section 11.24.2.6
288 */
289static int get_hub_status(struct usb_device *hdev,
290 struct usb_hub_status *data)
291{
292 int i, status = -ETIMEDOUT;
293
294 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
295 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
296 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
297 data, sizeof(*data), USB_STS_TIMEOUT);
298 }
299 return status;
300}
301
302/*
303 * USB 2.0 spec Section 11.24.2.7
304 */
305static int get_port_status(struct usb_device *hdev, int port1,
306 struct usb_port_status *data)
307{
308 int i, status = -ETIMEDOUT;
309
310 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
311 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
312 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
313 data, sizeof(*data), USB_STS_TIMEOUT);
314 }
315 return status;
316}
317
318static void kick_khubd(struct usb_hub *hub)
319{
320 unsigned long flags;
321
40f122f3
AS		 322 /* Suppress autosuspend until khubd runs */
323 to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
324
1da177e4 325 spin_lock_irqsave(&hub_event_lock, flags);
e8054854 326 if (!hub->disconnected & list_empty(&hub->event_list)) {
1da177e4
LT		 327 list_add_tail(&hub->event_list, &hub_event_list);
328 wake_up(&khubd_wait);
329 }
330 spin_unlock_irqrestore(&hub_event_lock, flags);
331}
332
333void usb_kick_khubd(struct usb_device *hdev)
334{
e8054854 335 /* FIXME: What if hdev isn't bound to the hub driver? */
1da177e4
LT		 336 kick_khubd(hdev_to_hub(hdev));
337}
338
339
340/* completion function, fires on port status changes and various faults */
7d12e780 341static void hub_irq(struct urb *urb)
1da177e4 342{
ec17cf1c 343 struct usb_hub *hub = urb->context;
1da177e4
LT		 344 int status;
345 int i;
346 unsigned long bits;
347
348 switch (urb->status) {
349 case -ENOENT: /* synchronous unlink */
350 case -ECONNRESET: /* async unlink */
351 case -ESHUTDOWN: /* hardware going away */
352 return;
353
354 default: /* presumably an error */
355 /* Cause a hub reset after 10 consecutive errors */
356 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
357 if ((++hub->nerrors < 10) || hub->error)
358 goto resubmit;
359 hub->error = urb->status;
360 /* FALL THROUGH */
ec17cf1c 361
1da177e4
LT		 362 /* let khubd handle things */
363 case 0: /* we got data: port status changed */
364 bits = 0;
365 for (i = 0; i < urb->actual_length; ++i)
366 bits |= ((unsigned long) ((*hub->buffer)[i]))
367 << (i*8);
368 hub->event_bits[0] = bits;
369 break;
370 }
371
372 hub->nerrors = 0;
373
374 /* Something happened, let khubd figure it out */
375 kick_khubd(hub);
376
377resubmit:
378 if (hub->quiescing)
379 return;
380
381 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
382 && status != -ENODEV && status != -EPERM)
383 dev_err (hub->intfdev, "resubmit --> %d\n", status);
384}
385
386/* USB 2.0 spec Section 11.24.2.3 */
387static inline int
388hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
389{
390 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
391 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
392 tt, NULL, 0, 1000);
393}
394
395/*
396 * enumeration blocks khubd for a long time. we use keventd instead, since
397 * long blocking there is the exception, not the rule. accordingly, HCDs
398 * talking to TTs must queue control transfers (not just bulk and iso), so
399 * both can talk to the same hub concurrently.
400 */
c4028958 401static void hub_tt_kevent (struct work_struct *work)
1da177e4 402{
c4028958
DH		 403 struct usb_hub *hub =
404 container_of(work, struct usb_hub, tt.kevent);
1da177e4 405 unsigned long flags;
55e5fdfa 406 int limit = 100;
1da177e4
LT		 407
408 spin_lock_irqsave (&hub->tt.lock, flags);
55e5fdfa 409 while (--limit && !list_empty (&hub->tt.clear_list)) {
1da177e4
LT		 410 struct list_head *temp;
411 struct usb_tt_clear *clear;
412 struct usb_device *hdev = hub->hdev;
413 int status;
414
415 temp = hub->tt.clear_list.next;
416 clear = list_entry (temp, struct usb_tt_clear, clear_list);
417 list_del (&clear->clear_list);
418
419 /* drop lock so HCD can concurrently report other TT errors */
420 spin_unlock_irqrestore (&hub->tt.lock, flags);
421 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
422 spin_lock_irqsave (&hub->tt.lock, flags);
423
424 if (status)
425 dev_err (&hdev->dev,
426 "clear tt %d (%04x) error %d\n",
427 clear->tt, clear->devinfo, status);
1bc3c9e1 428 kfree(clear);
1da177e4
LT		 429 }
430 spin_unlock_irqrestore (&hub->tt.lock, flags);
431}
432
433/**
434 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
435 * @udev: the device whose split transaction failed
436 * @pipe: identifies the endpoint of the failed transaction
437 *
438 * High speed HCDs use this to tell the hub driver that some split control or
439 * bulk transaction failed in a way that requires clearing internal state of
440 * a transaction translator. This is normally detected (and reported) from
441 * interrupt context.
442 *
443 * It may not be possible for that hub to handle additional full (or low)
444 * speed transactions until that state is fully cleared out.
445 */
446void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
447{
448 struct usb_tt *tt = udev->tt;
449 unsigned long flags;
450 struct usb_tt_clear *clear;
451
452 /* we've got to cope with an arbitrary number of pending TT clears,
453 * since each TT has "at least two" buffers that can need it (and
454 * there can be many TTs per hub). even if they're uncommon.
455 */
54e6ecb2 456 if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
1da177e4
LT		 457 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
458 /* FIXME recover somehow ... RESET_TT? */
459 return;
460 }
461
462 /* info that CLEAR_TT_BUFFER needs */
463 clear->tt = tt->multi ? udev->ttport : 1;
464 clear->devinfo = usb_pipeendpoint (pipe);
465 clear->devinfo |= udev->devnum << 4;
466 clear->devinfo |= usb_pipecontrol (pipe)
467 ? (USB_ENDPOINT_XFER_CONTROL << 11)
468 : (USB_ENDPOINT_XFER_BULK << 11);
469 if (usb_pipein (pipe))
470 clear->devinfo |= 1 << 15;
471
472 /* tell keventd to clear state for this TT */
473 spin_lock_irqsave (&tt->lock, flags);
474 list_add_tail (&clear->clear_list, &tt->clear_list);
475 schedule_work (&tt->kevent);
476 spin_unlock_irqrestore (&tt->lock, flags);
477}
478
479static void hub_power_on(struct usb_hub *hub)
480{
481 int port1;
b789696a 482 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
4489a571
AS		 483 u16 wHubCharacteristics =
484 le16_to_cpu(hub->descriptor->wHubCharacteristics);
485
486 /* Enable power on each port. Some hubs have reserved values
487 * of LPSM (> 2) in their descriptors, even though they are
488 * USB 2.0 hubs. Some hubs do not implement port-power switching
489 * but only emulate it. In all cases, the ports won't work
490 * unless we send these messages to the hub.
491 */
492 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
1da177e4 493 dev_dbg(hub->intfdev, "enabling power on all ports\n");
4489a571
AS		 494 else
495 dev_dbg(hub->intfdev, "trying to enable port power on "
496 "non-switchable hub\n");
497 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
498 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
1da177e4 499
b789696a
DB		 500 /* Wait at least 100 msec for power to become stable */
501 msleep(max(pgood_delay, (unsigned) 100));
1da177e4
LT		 502}
503
02c399ee 504static void hub_quiesce(struct usb_hub *hub)
1da177e4 505{
979d5199 506 /* (nonblocking) khubd and related activity won't re-trigger */
1da177e4 507 hub->quiescing = 1;
c9f89fa4 508 hub->activating = 0;
979d5199 509
979d5199 510 /* (blocking) stop khubd and related activity */
1da177e4
LT		 511 usb_kill_urb(hub->urb);
512 if (hub->has_indicators)
513 cancel_delayed_work(&hub->leds);
514 if (hub->has_indicators || hub->tt.hub)
515 flush_scheduled_work();
516}
517
518static void hub_activate(struct usb_hub *hub)
519{
520 int status;
521
522 hub->quiescing = 0;
523 hub->activating = 1;
40f122f3 524
1da177e4
LT		 525 status = usb_submit_urb(hub->urb, GFP_NOIO);
526 if (status < 0)
527 dev_err(hub->intfdev, "activate --> %d\n", status);
528 if (hub->has_indicators && blinkenlights)
529 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
530
531 /* scan all ports ASAP */
532 kick_khubd(hub);
533}
534
535static int hub_hub_status(struct usb_hub *hub,
536 u16 *status, u16 *change)
537{
538 int ret;
539
db90e7a1 540 mutex_lock(&hub->status_mutex);
1da177e4
LT		 541 ret = get_hub_status(hub->hdev, &hub->status->hub);
542 if (ret < 0)
543 dev_err (hub->intfdev,
544 "%s failed (err = %d)\n", __FUNCTION__, ret);
545 else {
546 *status = le16_to_cpu(hub->status->hub.wHubStatus);
547 *change = le16_to_cpu(hub->status->hub.wHubChange);
548 ret = 0;
549 }
db90e7a1 550 mutex_unlock(&hub->status_mutex);
1da177e4
LT		 551 return ret;
552}
553
8b28c752
AS		 554static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
555{
556 struct usb_device *hdev = hub->hdev;
0458d5b4 557 int ret = 0;
8b28c752 558
0458d5b4 559 if (hdev->children[port1-1] && set_state)
8b28c752
AS		 560 usb_set_device_state(hdev->children[port1-1],
561 USB_STATE_NOTATTACHED);
0458d5b4
AS		 562 if (!hub->error)
563 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
8b28c752
AS		 564 if (ret)
565 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
0458d5b4 566 port1, ret);
8b28c752
AS		 567 return ret;
568}
569
0458d5b4
AS		 570/*
571 * Disable a port and mark a logical connnect-change event, so that some
572 * time later khubd will disconnect() any existing usb_device on the port
573 * and will re-enumerate if there actually is a device attached.
574 */
575static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
576{
577 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
578 hub_port_disable(hub, port1, 1);
7d069b7d 579
0458d5b4
AS		 580 /* FIXME let caller ask to power down the port:
581 * - some devices won't enumerate without a VBUS power cycle
582 * - SRP saves power that way
583 * - ... new call, TBD ...
584 * That's easy if this hub can switch power per-port, and
585 * khubd reactivates the port later (timer, SRP, etc).
586 * Powerdown must be optional, because of reset/DFU.
587 */
588
589 set_bit(port1, hub->change_bits);
590 kick_khubd(hub);
591}
592
593static void disconnect_all_children(struct usb_hub *hub, int logical)
7d069b7d
AS		 594{
595 struct usb_device *hdev = hub->hdev;
596 int port1;
597
598 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
0458d5b4
AS		 599 if (hdev->children[port1-1]) {
600 if (logical)
601 hub_port_logical_disconnect(hub, port1);
602 else
603 usb_disconnect(&hdev->children[port1-1]);
604 }
605 }
606}
607
608#ifdef CONFIG_USB_PERSIST
609
610#define USB_PERSIST 1
611
612/* For "persistent-device" resets we must mark the child devices for reset
613 * and turn off a possible connect-change status (so khubd won't disconnect
614 * them later).
615 */
616static void mark_children_for_reset_resume(struct usb_hub *hub)
617{
618 struct usb_device *hdev = hub->hdev;
619 int port1;
620
621 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
622 struct usb_device *child = hdev->children[port1-1];
623
624 if (child) {
625 child->reset_resume = 1;
626 clear_port_feature(hdev, port1,
627 USB_PORT_FEAT_C_CONNECTION);
7d069b7d
AS		 628 }
629 }
0458d5b4
AS		 630}
631
632#else
633
634#define USB_PERSIST 0
635
636static inline void mark_children_for_reset_resume(struct usb_hub *hub)
637{ }
638
639#endif /* CONFIG_USB_PERSIST */
640
641/* caller has locked the hub device */
642static void hub_pre_reset(struct usb_interface *intf)
643{
644 struct usb_hub *hub = usb_get_intfdata(intf);
645
646 /* This routine doesn't run as part of a reset-resume, so it's safe
647 * to disconnect all the drivers below the hub.
648 */
649 disconnect_all_children(hub, 0);
7d069b7d
AS		 650 hub_quiesce(hub);
651}
652
653/* caller has locked the hub device */
0458d5b4 654static void hub_post_reset(struct usb_interface *intf, int reset_resume)
7d069b7d 655{
7de18d8b
AS		 656 struct usb_hub *hub = usb_get_intfdata(intf);
657
7d069b7d 658 hub_power_on(hub);
0458d5b4
AS		 659 if (reset_resume) {
660 if (USB_PERSIST)
661 mark_children_for_reset_resume(hub);
662 else {
663 /* Reset-resume doesn't call pre_reset, so we have to
664 * disconnect the children here. But we may not lock
665 * the child devices, so we have to do a "logical"
666 * disconnect.
667 */
668 disconnect_all_children(hub, 1);
669 }
670 }
671 hub_activate(hub);
7d069b7d
AS		 672}
673
674
1da177e4
LT		 675static int hub_configure(struct usb_hub *hub,
676 struct usb_endpoint_descriptor *endpoint)
677{
678 struct usb_device *hdev = hub->hdev;
679 struct device *hub_dev = hub->intfdev;
680 u16 hubstatus, hubchange;
74ad9bd2 681 u16 wHubCharacteristics;
1da177e4
LT		 682 unsigned int pipe;
683 int maxp, ret;
684 char *message;
685
686 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
687 &hub->buffer_dma);
688 if (!hub->buffer) {
689 message = "can't allocate hub irq buffer";
690 ret = -ENOMEM;
691 goto fail;
692 }
693
694 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
695 if (!hub->status) {
696 message = "can't kmalloc hub status buffer";
697 ret = -ENOMEM;
698 goto fail;
699 }
db90e7a1 700 mutex_init(&hub->status_mutex);
1da177e4
LT		 701
702 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
703 if (!hub->descriptor) {
704 message = "can't kmalloc hub descriptor";
705 ret = -ENOMEM;
706 goto fail;
707 }
708
709 /* Request the entire hub descriptor.
710 * hub->descriptor can handle USB_MAXCHILDREN ports,
711 * but the hub can/will return fewer bytes here.
712 */
713 ret = get_hub_descriptor(hdev, hub->descriptor,
714 sizeof(*hub->descriptor));
715 if (ret < 0) {
716 message = "can't read hub descriptor";
717 goto fail;
718 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
719 message = "hub has too many ports!";
720 ret = -ENODEV;
721 goto fail;
722 }
723
724 hdev->maxchild = hub->descriptor->bNbrPorts;
725 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
726 (hdev->maxchild == 1) ? "" : "s");
727
74ad9bd2 728 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4 729
74ad9bd2 730 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
1da177e4
LT		 731 int i;
732 char portstr [USB_MAXCHILDREN + 1];
733
734 for (i = 0; i < hdev->maxchild; i++)
735 portstr[i] = hub->descriptor->DeviceRemovable
736 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
737 ? 'F' : 'R';
738 portstr[hdev->maxchild] = 0;
739 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
740 } else
741 dev_dbg(hub_dev, "standalone hub\n");
742
74ad9bd2 743 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1da177e4
LT		 744 case 0x00:
745 dev_dbg(hub_dev, "ganged power switching\n");
746 break;
747 case 0x01:
748 dev_dbg(hub_dev, "individual port power switching\n");
749 break;
750 case 0x02:
751 case 0x03:
752 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
753 break;
754 }
755
74ad9bd2 756 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1da177e4
LT		 757 case 0x00:
758 dev_dbg(hub_dev, "global over-current protection\n");
759 break;
760 case 0x08:
761 dev_dbg(hub_dev, "individual port over-current protection\n");
762 break;
763 case 0x10:
764 case 0x18:
765 dev_dbg(hub_dev, "no over-current protection\n");
766 break;
767 }
768
769 spin_lock_init (&hub->tt.lock);
770 INIT_LIST_HEAD (&hub->tt.clear_list);
c4028958 771 INIT_WORK (&hub->tt.kevent, hub_tt_kevent);
1da177e4
LT		 772 switch (hdev->descriptor.bDeviceProtocol) {
773 case 0:
774 break;
775 case 1:
776 dev_dbg(hub_dev, "Single TT\n");
777 hub->tt.hub = hdev;
778 break;
779 case 2:
780 ret = usb_set_interface(hdev, 0, 1);
781 if (ret == 0) {
782 dev_dbg(hub_dev, "TT per port\n");
783 hub->tt.multi = 1;
784 } else
785 dev_err(hub_dev, "Using single TT (err %d)\n",
786 ret);
787 hub->tt.hub = hdev;
788 break;
789 default:
790 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
791 hdev->descriptor.bDeviceProtocol);
792 break;
793 }
794
e09711ae 795 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
74ad9bd2 796 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
e09711ae
DB		 797 case HUB_TTTT_8_BITS:
798 if (hdev->descriptor.bDeviceProtocol != 0) {
799 hub->tt.think_time = 666;
800 dev_dbg(hub_dev, "TT requires at most %d "
801 "FS bit times (%d ns)\n",
802 8, hub->tt.think_time);
803 }
1da177e4 804 break;
e09711ae
DB		 805 case HUB_TTTT_16_BITS:
806 hub->tt.think_time = 666 * 2;
807 dev_dbg(hub_dev, "TT requires at most %d "
808 "FS bit times (%d ns)\n",
809 16, hub->tt.think_time);
1da177e4 810 break;
e09711ae
DB		 811 case HUB_TTTT_24_BITS:
812 hub->tt.think_time = 666 * 3;
813 dev_dbg(hub_dev, "TT requires at most %d "
814 "FS bit times (%d ns)\n",
815 24, hub->tt.think_time);
1da177e4 816 break;
e09711ae
DB		 817 case HUB_TTTT_32_BITS:
818 hub->tt.think_time = 666 * 4;
819 dev_dbg(hub_dev, "TT requires at most %d "
820 "FS bit times (%d ns)\n",
821 32, hub->tt.think_time);
1da177e4
LT		 822 break;
823 }
824
825 /* probe() zeroes hub->indicator[] */
74ad9bd2 826 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1da177e4
LT		 827 hub->has_indicators = 1;
828 dev_dbg(hub_dev, "Port indicators are supported\n");
829 }
830
831 dev_dbg(hub_dev, "power on to power good time: %dms\n",
832 hub->descriptor->bPwrOn2PwrGood * 2);
833
834 /* power budgeting mostly matters with bus-powered hubs,
835 * and battery-powered root hubs (may provide just 8 mA).
836 */
837 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
55c52718 838 if (ret < 2) {
1da177e4
LT		 839 message = "can't get hub status";
840 goto fail;
841 }
7d35b929
AS		 842 le16_to_cpus(&hubstatus);
843 if (hdev == hdev->bus->root_hub) {
55c52718
AS		 844 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
845 hub->mA_per_port = 500;
846 else {
847 hub->mA_per_port = hdev->bus_mA;
848 hub->limited_power = 1;
849 }
7d35b929 850 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1da177e4
LT		 851 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
852 hub->descriptor->bHubContrCurrent);
55c52718
AS		 853 hub->limited_power = 1;
854 if (hdev->maxchild > 0) {
855 int remaining = hdev->bus_mA -
856 hub->descriptor->bHubContrCurrent;
857
858 if (remaining < hdev->maxchild * 100)
859 dev_warn(hub_dev,
860 "insufficient power available "
861 "to use all downstream ports\n");
862 hub->mA_per_port = 100; /* 7.2.1.1 */
863 }
864 } else { /* Self-powered external hub */
865 /* FIXME: What about battery-powered external hubs that
866 * provide less current per port? */
867 hub->mA_per_port = 500;
7d35b929 868 }
55c52718
AS		 869 if (hub->mA_per_port < 500)
870 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
871 hub->mA_per_port);
1da177e4
LT		 872
873 ret = hub_hub_status(hub, &hubstatus, &hubchange);
874 if (ret < 0) {
875 message = "can't get hub status";
876 goto fail;
877 }
878
879 /* local power status reports aren't always correct */
880 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
881 dev_dbg(hub_dev, "local power source is %s\n",
882 (hubstatus & HUB_STATUS_LOCAL_POWER)
883 ? "lost (inactive)" : "good");
884
74ad9bd2 885 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1da177e4
LT		 886 dev_dbg(hub_dev, "%sover-current condition exists\n",
887 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
888
88fafff9 889 /* set up the interrupt endpoint
890 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
891 * bytes as USB2.0[11.12.3] says because some hubs are known
892 * to send more data (and thus cause overflow). For root hubs,
893 * maxpktsize is defined in hcd.c's fake endpoint descriptors
894 * to be big enough for at least USB_MAXCHILDREN ports. */
1da177e4
LT		 895 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
896 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
897
898 if (maxp > sizeof(*hub->buffer))
899 maxp = sizeof(*hub->buffer);
900
901 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
902 if (!hub->urb) {
903 message = "couldn't allocate interrupt urb";
904 ret = -ENOMEM;
905 goto fail;
906 }
907
908 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
909 hub, endpoint->bInterval);
910 hub->urb->transfer_dma = hub->buffer_dma;
911 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
912
913 /* maybe cycle the hub leds */
914 if (hub->has_indicators && blinkenlights)
915 hub->indicator [0] = INDICATOR_CYCLE;
916
917 hub_power_on(hub);
918 hub_activate(hub);
919 return 0;
920
921fail:
922 dev_err (hub_dev, "config failed, %s (err %d)\n",
923 message, ret);
924 /* hub_disconnect() frees urb and descriptor */
925 return ret;
926}
927
e8054854
AS		 928static void hub_release(struct kref *kref)
929{
930 struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
931
932 usb_put_intf(to_usb_interface(hub->intfdev));
933 kfree(hub);
934}
935
1da177e4
LT		 936static unsigned highspeed_hubs;
937
938static void hub_disconnect(struct usb_interface *intf)
939{
940 struct usb_hub *hub = usb_get_intfdata (intf);
e8054854
AS		 941
942 /* Take the hub off the event list and don't let it be added again */
943 spin_lock_irq(&hub_event_lock);
944 list_del_init(&hub->event_list);
945 hub->disconnected = 1;
946 spin_unlock_irq(&hub_event_lock);
1da177e4 947
7de18d8b
AS		 948 /* Disconnect all children and quiesce the hub */
949 hub->error = 0;
950 hub_pre_reset(intf);
951
8b28c752 952 usb_set_intfdata (intf, NULL);
1da177e4 953
e8054854 954 if (hub->hdev->speed == USB_SPEED_HIGH)
1da177e4
LT		 955 highspeed_hubs--;
956
1da177e4 957 usb_free_urb(hub->urb);
1bc3c9e1 958 kfree(hub->descriptor);
1bc3c9e1 959 kfree(hub->status);
e8054854
AS		 960 usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer,
961 hub->buffer_dma);
1da177e4 962
e8054854 963 kref_put(&hub->kref, hub_release);
1da177e4
LT		 964}
965
966static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
967{
968 struct usb_host_interface *desc;
969 struct usb_endpoint_descriptor *endpoint;
970 struct usb_device *hdev;
971 struct usb_hub *hub;
972
973 desc = intf->cur_altsetting;
974 hdev = interface_to_usbdev(intf);
975
89ccbdc9
DB		 976#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
977 if (hdev->parent) {
978 dev_warn(&intf->dev, "ignoring external hub\n");
979 return -ENODEV;
980 }
981#endif
982
1da177e4
LT		 983 /* Some hubs have a subclass of 1, which AFAICT according to the */
984 /* specs is not defined, but it works */
985 if ((desc->desc.bInterfaceSubClass != 0) &&
986 (desc->desc.bInterfaceSubClass != 1)) {
987descriptor_error:
988 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
989 return -EIO;
990 }
991
992 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
993 if (desc->desc.bNumEndpoints != 1)
994 goto descriptor_error;
995
996 endpoint = &desc->endpoint[0].desc;
997
fbf81c29
LFC		 998 /* If it's not an interrupt in endpoint, we'd better punt! */
999 if (!usb_endpoint_is_int_in(endpoint))
1da177e4
LT		 1000 goto descriptor_error;
1001
1002 /* We found a hub */
1003 dev_info (&intf->dev, "USB hub found\n");
1004
0a1ef3b5 1005 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1da177e4
LT		 1006 if (!hub) {
1007 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
1008 return -ENOMEM;
1009 }
1010
e8054854 1011 kref_init(&hub->kref);
1da177e4
LT		 1012 INIT_LIST_HEAD(&hub->event_list);
1013 hub->intfdev = &intf->dev;
1014 hub->hdev = hdev;
c4028958 1015 INIT_DELAYED_WORK(&hub->leds, led_work);
e8054854 1016 usb_get_intf(intf);
1da177e4
LT		 1017
1018 usb_set_intfdata (intf, hub);
40f122f3 1019 intf->needs_remote_wakeup = 1;
1da177e4
LT		 1020
1021 if (hdev->speed == USB_SPEED_HIGH)
1022 highspeed_hubs++;
1023
1024 if (hub_configure(hub, endpoint) >= 0)
1025 return 0;
1026
1027 hub_disconnect (intf);
1028 return -ENODEV;
1029}
1030
1031static int
1032hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
1033{
1034 struct usb_device *hdev = interface_to_usbdev (intf);
1035
1036 /* assert ifno == 0 (part of hub spec) */
1037 switch (code) {
1038 case USBDEVFS_HUB_PORTINFO: {
1039 struct usbdevfs_hub_portinfo *info = user_data;
1040 int i;
1041
1042 spin_lock_irq(&device_state_lock);
1043 if (hdev->devnum <= 0)
1044 info->nports = 0;
1045 else {
1046 info->nports = hdev->maxchild;
1047 for (i = 0; i < info->nports; i++) {
1048 if (hdev->children[i] == NULL)
1049 info->port[i] = 0;
1050 else
1051 info->port[i] =
1052 hdev->children[i]->devnum;
1053 }
1054 }
1055 spin_unlock_irq(&device_state_lock);
1056
1057 return info->nports + 1;
1058 }
1059
1060 default:
1061 return -ENOSYS;
1062 }
1063}
1064
1da177e4 1065
1da177e4
LT		 1066static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1067{
1068 int i;
1069
1070 for (i = 0; i < udev->maxchild; ++i) {
1071 if (udev->children[i])
1072 recursively_mark_NOTATTACHED(udev->children[i]);
1073 }
ee49fb5d
AS		 1074 if (udev->state == USB_STATE_SUSPENDED)
1075 udev->discon_suspended = 1;
1da177e4
LT		 1076 udev->state = USB_STATE_NOTATTACHED;
1077}
1078
1079/**
1080 * usb_set_device_state - change a device's current state (usbcore, hcds)
1081 * @udev: pointer to device whose state should be changed
1082 * @new_state: new state value to be stored
1083 *
1084 * udev->state is _not_ fully protected by the device lock. Although
1085 * most transitions are made only while holding the lock, the state can
1086 * can change to USB_STATE_NOTATTACHED at almost any time. This
1087 * is so that devices can be marked as disconnected as soon as possible,
1088 * without having to wait for any semaphores to be released. As a result,
1089 * all changes to any device's state must be protected by the
1090 * device_state_lock spinlock.
1091 *
1092 * Once a device has been added to the device tree, all changes to its state
1093 * should be made using this routine. The state should _not_ be set directly.
1094 *
1095 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1096 * Otherwise udev->state is set to new_state, and if new_state is
1097 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1098 * to USB_STATE_NOTATTACHED.
1099 */
1100void usb_set_device_state(struct usb_device *udev,
1101 enum usb_device_state new_state)
1102{
1103 unsigned long flags;
1104
1105 spin_lock_irqsave(&device_state_lock, flags);
1106 if (udev->state == USB_STATE_NOTATTACHED)
1107 ; /* do nothing */
b94dc6b5 1108 else if (new_state != USB_STATE_NOTATTACHED) {
fb669cc0
DB		 1109
1110 /* root hub wakeup capabilities are managed out-of-band
1111 * and may involve silicon errata ... ignore them here.
1112 */
1113 if (udev->parent) {
645daaab
AS		 1114 if (udev->state == USB_STATE_SUSPENDED
1115 || new_state == USB_STATE_SUSPENDED)
1116 ; /* No change to wakeup settings */
1117 else if (new_state == USB_STATE_CONFIGURED)
fb669cc0
DB		 1118 device_init_wakeup(&udev->dev,
1119 (udev->actconfig->desc.bmAttributes
1120 & USB_CONFIG_ATT_WAKEUP));
645daaab 1121 else
fb669cc0
DB		 1122 device_init_wakeup(&udev->dev, 0);
1123 }
645daaab 1124 udev->state = new_state;
b94dc6b5 1125 } else
1da177e4
LT		 1126 recursively_mark_NOTATTACHED(udev);
1127 spin_unlock_irqrestore(&device_state_lock, flags);
1128}
1da177e4
LT		 1129
1130
d388dab7 1131#ifdef CONFIG_PM
1c50c317 1132
0458d5b4
AS		 1133/**
1134 * usb_reset_suspended_device - reset a suspended device instead of resuming it
1135 * @udev: device to be reset instead of resumed
1136 *
1137 * If a host controller doesn't maintain VBUS suspend current during a
1138 * system sleep or is reset when the system wakes up, all the USB
1139 * power sessions below it will be broken. This is especially troublesome
1140 * for mass-storage devices containing mounted filesystems, since the
1141 * device will appear to have disconnected and all the memory mappings
1142 * to it will be lost.
1143 *
1144 * As an alternative, this routine attempts to recover power sessions for
1145 * devices that are still present by resetting them instead of resuming
1146 * them. If all goes well, the devices will appear to persist across the
1147 * the interruption of the power sessions.
1148 *
1149 * This facility is inherently dangerous. Although usb_reset_device()
1150 * makes every effort to insure that the same device is present after the
1151 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
1152 * quite possible for a device to remain unaltered but its media to be
1153 * changed. If the user replaces a flash memory card while the system is
1154 * asleep, he will have only himself to blame when the filesystem on the
1155 * new card is corrupted and the system crashes.
1156 */
1157int usb_reset_suspended_device(struct usb_device *udev)
1158{
1159 int rc = 0;
1160
1161 dev_dbg(&udev->dev, "usb %sresume\n", "reset-");
1162
1163 /* After we're done the device won't be suspended any more.
1164 * In addition, the reset won't work if udev->state is SUSPENDED.
1165 */
1166 usb_set_device_state(udev, udev->actconfig
1167 ? USB_STATE_CONFIGURED
1168 : USB_STATE_ADDRESS);
1169
1170 /* Root hubs don't need to be (and can't be) reset */
1171 if (udev->parent)
1172 rc = usb_reset_device(udev);
1173 return rc;
1174}
1175
1c50c317
AS		 1176/**
1177 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1178 * @rhdev: struct usb_device for the root hub
1179 *
1180 * The USB host controller driver calls this function when its root hub
1181 * is resumed and Vbus power has been interrupted or the controller
0458d5b4
AS		 1182 * has been reset. The routine marks @rhdev as having lost power. When
1183 * the hub driver is resumed it will take notice; if CONFIG_USB_PERSIST
1184 * is enabled then it will carry out power-session recovery, otherwise
1185 * it will disconnect all the child devices.
1c50c317
AS		 1186 */
1187void usb_root_hub_lost_power(struct usb_device *rhdev)
1188{
1c50c317 1189 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
0458d5b4 1190 rhdev->reset_resume = 1;
1c50c317
AS		 1191}
1192EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1193
d388dab7 1194#endif /* CONFIG_PM */
1c50c317 1195
1da177e4
LT		 1196static void choose_address(struct usb_device *udev)
1197{
1198 int devnum;
1199 struct usb_bus *bus = udev->bus;
1200
1201 /* If khubd ever becomes multithreaded, this will need a lock */
1202
1203 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1204 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1205 bus->devnum_next);
1206 if (devnum >= 128)
1207 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1208
1209 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1210
1211 if (devnum < 128) {
1212 set_bit(devnum, bus->devmap.devicemap);
1213 udev->devnum = devnum;
1214 }
1215}
1216
1217static void release_address(struct usb_device *udev)
1218{
1219 if (udev->devnum > 0) {
1220 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1221 udev->devnum = -1;
1222 }
1223}
1224
d5d4db70
AS		 1225#ifdef CONFIG_USB_SUSPEND
1226
1227static void usb_stop_pm(struct usb_device *udev)
1228{
1229 /* Synchronize with the ksuspend thread to prevent any more
1230 * autosuspend requests from being submitted, and decrement
1231 * the parent's count of unsuspended children.
1232 */
1233 usb_pm_lock(udev);
1234 if (udev->parent && !udev->discon_suspended)
1235 usb_autosuspend_device(udev->parent);
1236 usb_pm_unlock(udev);
1237
1238 /* Stop any autosuspend requests already submitted */
1239 cancel_rearming_delayed_work(&udev->autosuspend);
1240}
1241
1242#else
1243
1244static inline void usb_stop_pm(struct usb_device *udev)
1245{ }
1246
1247#endif
1248
1da177e4
LT		 1249/**
1250 * usb_disconnect - disconnect a device (usbcore-internal)
1251 * @pdev: pointer to device being disconnected
1252 * Context: !in_interrupt ()
1253 *
1254 * Something got disconnected. Get rid of it and all of its children.
1255 *
1256 * If *pdev is a normal device then the parent hub must already be locked.
1257 * If *pdev is a root hub then this routine will acquire the
1258 * usb_bus_list_lock on behalf of the caller.
1259 *
1260 * Only hub drivers (including virtual root hub drivers for host
1261 * controllers) should ever call this.
1262 *
1263 * This call is synchronous, and may not be used in an interrupt context.
1264 */
1265void usb_disconnect(struct usb_device **pdev)
1266{
1267 struct usb_device *udev = *pdev;
1268 int i;
1269
1270 if (!udev) {
1271 pr_debug ("%s nodev\n", __FUNCTION__);
1272 return;
1273 }
1274
1275 /* mark the device as inactive, so any further urb submissions for
1276 * this device (and any of its children) will fail immediately.
1277 * this quiesces everyting except pending urbs.
1278 */
1279 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1da177e4
LT		 1280 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1281
9ad3d6cc
AS		 1282 usb_lock_device(udev);
1283
1da177e4
LT		 1284 /* Free up all the children before we remove this device */
1285 for (i = 0; i < USB_MAXCHILDREN; i++) {
1286 if (udev->children[i])
1287 usb_disconnect(&udev->children[i]);
1288 }
1289
1290 /* deallocate hcd/hardware state ... nuking all pending urbs and
1291 * cleaning up all state associated with the current configuration
1292 * so that the hardware is now fully quiesced.
1293 */
782da727 1294 dev_dbg (&udev->dev, "unregistering device\n");
1da177e4
LT		 1295 usb_disable_device(udev, 0);
1296
782da727
AS		 1297 usb_unlock_device(udev);
1298
1299 /* Unregister the device. The device driver is responsible
1300 * for removing the device files from usbfs and sysfs and for
1301 * de-configuring the device.
1302 */
1303 device_del(&udev->dev);
3099e75a 1304
782da727 1305 /* Free the device number and delete the parent's children[]
1da177e4
LT		 1306 * (or root_hub) pointer.
1307 */
1da177e4 1308 release_address(udev);
1da177e4
LT		 1309
1310 /* Avoid races with recursively_mark_NOTATTACHED() */
1311 spin_lock_irq(&device_state_lock);
1312 *pdev = NULL;
1313 spin_unlock_irq(&device_state_lock);
1314
d5d4db70 1315 usb_stop_pm(udev);
ee49fb5d 1316
782da727 1317 put_device(&udev->dev);
1da177e4
LT		 1318}
1319
1320#ifdef DEBUG
1321static void show_string(struct usb_device *udev, char *id, char *string)
1322{
1323 if (!string)
1324 return;
1325 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1326}
1327
1328#else
1329static inline void show_string(struct usb_device *udev, char *id, char *string)
1330{}
1331#endif
1332
1da177e4
LT		 1333
1334#ifdef CONFIG_USB_OTG
1335#include "otg_whitelist.h"
1336#endif
1337
3ede760f
ON		 1338/**
1339 * usb_new_device - perform initial device setup (usbcore-internal)
1340 * @udev: newly addressed device (in ADDRESS state)
1341 *
1342 * This is called with devices which have been enumerated, but not yet
1343 * configured. The device descriptor is available, but not descriptors
1344 * for any device configuration. The caller must have locked either
1345 * the parent hub (if udev is a normal device) or else the
1346 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1347 * udev has already been installed, but udev is not yet visible through
1348 * sysfs or other filesystem code.
1349 *
1350 * It will return if the device is configured properly or not. Zero if
1351 * the interface was registered with the driver core; else a negative
1352 * errno value.
1353 *
1354 * This call is synchronous, and may not be used in an interrupt context.
1355 *
1356 * Only the hub driver or root-hub registrar should ever call this.
1357 */
1358int usb_new_device(struct usb_device *udev)
1da177e4
LT		 1359{
1360 int err;
1da177e4 1361
7ceec1f1
ON		 1362 /* Determine quirks */
1363 usb_detect_quirks(udev);
1364
1da177e4
LT		 1365 err = usb_get_configuration(udev);
1366 if (err < 0) {
1367 dev_err(&udev->dev, "can't read configurations, error %d\n",
1368 err);
1369 goto fail;
1370 }
1371
1372 /* read the standard strings and cache them if present */
4f62efe6
AS		 1373 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1374 udev->manufacturer = usb_cache_string(udev,
1375 udev->descriptor.iManufacturer);
1376 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1da177e4
LT		 1377
1378 /* Tell the world! */
1379 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1380 "SerialNumber=%d\n",
1381 udev->descriptor.iManufacturer,
1382 udev->descriptor.iProduct,
1383 udev->descriptor.iSerialNumber);
1384 show_string(udev, "Product", udev->product);
1385 show_string(udev, "Manufacturer", udev->manufacturer);
1386 show_string(udev, "SerialNumber", udev->serial);
1387
1388#ifdef CONFIG_USB_OTG
1389 /*
1390 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1391 * to wake us after we've powered off VBUS; and HNP, switching roles
1392 * "host" to "peripheral". The OTG descriptor helps figure this out.
1393 */
1394 if (!udev->bus->is_b_host
1395 && udev->config
1396 && udev->parent == udev->bus->root_hub) {
1397 struct usb_otg_descriptor *desc = 0;
1398 struct usb_bus *bus = udev->bus;
1399
1400 /* descriptor may appear anywhere in config */
1401 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1402 le16_to_cpu(udev->config[0].desc.wTotalLength),
1403 USB_DT_OTG, (void **) &desc) == 0) {
1404 if (desc->bmAttributes & USB_OTG_HNP) {
12c3da34 1405 unsigned port1 = udev->portnum;
fc849b85 1406
1da177e4
LT		 1407 dev_info(&udev->dev,
1408 "Dual-Role OTG device on %sHNP port\n",
1409 (port1 == bus->otg_port)
1410 ? "" : "non-");
1411
1412 /* enable HNP before suspend, it's simpler */
1413 if (port1 == bus->otg_port)
1414 bus->b_hnp_enable = 1;
1415 err = usb_control_msg(udev,
1416 usb_sndctrlpipe(udev, 0),
1417 USB_REQ_SET_FEATURE, 0,
1418 bus->b_hnp_enable
1419 ? USB_DEVICE_B_HNP_ENABLE
1420 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1421 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1422 if (err < 0) {
1423 /* OTG MESSAGE: report errors here,
1424 * customize to match your product.
1425 */
1426 dev_info(&udev->dev,
1427 "can't set HNP mode; %d\n",
1428 err);
1429 bus->b_hnp_enable = 0;
1430 }
1431 }
1432 }
1433 }
1434
1435 if (!is_targeted(udev)) {
1436
1437 /* Maybe it can talk to us, though we can't talk to it.
1438 * (Includes HNP test device.)
1439 */
1440 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
4956eccd 1441 err = usb_port_suspend(udev);
1da177e4
LT		 1442 if (err < 0)
1443 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1444 }
ffcdc18d 1445 err = -ENOTSUPP;
1da177e4
LT		 1446 goto fail;
1447 }
1448#endif
1449
9f8b17e6
KS		 1450 /* export the usbdev device-node for libusb */
1451 udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
1452 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1453
782da727 1454 /* Register the device. The device driver is responsible
9f8b17e6
KS		 1455 * for adding the device files to sysfs and for configuring
1456 * the device.
782da727 1457 */
9f8b17e6 1458 err = device_add(&udev->dev);
1da177e4
LT		 1459 if (err) {
1460 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1461 goto fail;
1462 }
9ad3d6cc 1463
ee49fb5d
AS		 1464 /* Increment the parent's count of unsuspended children */
1465 if (udev->parent)
94fcda1f 1466 usb_autoresume_device(udev->parent);
ee49fb5d 1467
c066475e 1468exit:
c066475e 1469 return err;
1da177e4
LT		 1470
1471fail:
1472 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
c066475e 1473 goto exit;
1da177e4
LT		 1474}
1475
1da177e4
LT		 1476static int hub_port_status(struct usb_hub *hub, int port1,
1477 u16 *status, u16 *change)
1478{
1479 int ret;
1480
db90e7a1 1481 mutex_lock(&hub->status_mutex);
1da177e4 1482 ret = get_port_status(hub->hdev, port1, &hub->status->port);
d25450c6 1483 if (ret < 4) {
1da177e4
LT		 1484 dev_err (hub->intfdev,
1485 "%s failed (err = %d)\n", __FUNCTION__, ret);
d25450c6
AS		 1486 if (ret >= 0)
1487 ret = -EIO;
1488 } else {
1da177e4
LT		 1489 *status = le16_to_cpu(hub->status->port.wPortStatus);
1490 *change = le16_to_cpu(hub->status->port.wPortChange);
1491 ret = 0;
1492 }
db90e7a1 1493 mutex_unlock(&hub->status_mutex);
1da177e4
LT		 1494 return ret;
1495}
1496
0165de09
IPG		 1497
1498/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1499static unsigned hub_is_wusb(struct usb_hub *hub)
1500{
1501 struct usb_hcd *hcd;
1502 if (hub->hdev->parent != NULL) /* not a root hub? */
1503 return 0;
1504 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1505 return hcd->wireless;
1506}
1507
1508
1da177e4
LT		 1509#define PORT_RESET_TRIES 5
1510#define SET_ADDRESS_TRIES 2
1511#define GET_DESCRIPTOR_TRIES 2
1512#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1513#define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1514
1515#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1516#define HUB_SHORT_RESET_TIME 10
1517#define HUB_LONG_RESET_TIME 200
1518#define HUB_RESET_TIMEOUT 500
1519
1520static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1521 struct usb_device *udev, unsigned int delay)
1522{
1523 int delay_time, ret;
1524 u16 portstatus;
1525 u16 portchange;
1526
1527 for (delay_time = 0;
1528 delay_time < HUB_RESET_TIMEOUT;
1529 delay_time += delay) {
1530 /* wait to give the device a chance to reset */
1531 msleep(delay);
1532
1533 /* read and decode port status */
1534 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1535 if (ret < 0)
1536 return ret;
1537
1538 /* Device went away? */
1539 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1540 return -ENOTCONN;
1541
dd4dd19e 1542 /* bomb out completely if the connection bounced */
1da177e4 1543 if ((portchange & USB_PORT_STAT_C_CONNECTION))
dd4dd19e 1544 return -ENOTCONN;
1da177e4
LT		 1545
1546 /* if we`ve finished resetting, then break out of the loop */
1547 if (!(portstatus & USB_PORT_STAT_RESET) &&
1548 (portstatus & USB_PORT_STAT_ENABLE)) {
0165de09
IPG		 1549 if (hub_is_wusb(hub))
1550 udev->speed = USB_SPEED_VARIABLE;
1551 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1da177e4
LT		 1552 udev->speed = USB_SPEED_HIGH;
1553 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1554 udev->speed = USB_SPEED_LOW;
1555 else
1556 udev->speed = USB_SPEED_FULL;
1557 return 0;
1558 }
1559
1560 /* switch to the long delay after two short delay failures */
1561 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1562 delay = HUB_LONG_RESET_TIME;
1563
1564 dev_dbg (hub->intfdev,
1565 "port %d not reset yet, waiting %dms\n",
1566 port1, delay);
1567 }
1568
1569 return -EBUSY;
1570}
1571
1572static int hub_port_reset(struct usb_hub *hub, int port1,
1573 struct usb_device *udev, unsigned int delay)
1574{
1575 int i, status;
1576
1577 /* Reset the port */
1578 for (i = 0; i < PORT_RESET_TRIES; i++) {
1579 status = set_port_feature(hub->hdev,
1580 port1, USB_PORT_FEAT_RESET);
1581 if (status)
1582 dev_err(hub->intfdev,
1583 "cannot reset port %d (err = %d)\n",
1584 port1, status);
1585 else {
1586 status = hub_port_wait_reset(hub, port1, udev, delay);
dd16525b 1587 if (status && status != -ENOTCONN)
1da177e4
LT		 1588 dev_dbg(hub->intfdev,
1589 "port_wait_reset: err = %d\n",
1590 status);
1591 }
1592
1593 /* return on disconnect or reset */
1594 switch (status) {
1595 case 0:
b789696a
DB		 1596 /* TRSTRCY = 10 ms; plus some extra */
1597 msleep(10 + 40);
1da177e4
LT		 1598 /* FALL THROUGH */
1599 case -ENOTCONN:
1600 case -ENODEV:
1601 clear_port_feature(hub->hdev,
1602 port1, USB_PORT_FEAT_C_RESET);
1603 /* FIXME need disconnect() for NOTATTACHED device */
1604 usb_set_device_state(udev, status
1605 ? USB_STATE_NOTATTACHED
1606 : USB_STATE_DEFAULT);
1607 return status;
1608 }
1609
1610 dev_dbg (hub->intfdev,
1611 "port %d not enabled, trying reset again...\n",
1612 port1);
1613 delay = HUB_LONG_RESET_TIME;
1614 }
1615
1616 dev_err (hub->intfdev,
1617 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1618 port1);
1619
1620 return status;
1621}
1622
d388dab7 1623#ifdef CONFIG_PM
1da177e4
LT		 1624
1625#ifdef CONFIG_USB_SUSPEND
1626
1627/*
1628 * Selective port suspend reduces power; most suspended devices draw
1629 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1630 * All devices below the suspended port are also suspended.
1631 *
1632 * Devices leave suspend state when the host wakes them up. Some devices
1633 * also support "remote wakeup", where the device can activate the USB
1634 * tree above them to deliver data, such as a keypress or packet. In
1635 * some cases, this wakes the USB host.
1636 */
1637static int hub_port_suspend(struct usb_hub *hub, int port1,
1638 struct usb_device *udev)
1639{
1640 int status;
1641
1642 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1643
1644 /* enable remote wakeup when appropriate; this lets the device
1645 * wake up the upstream hub (including maybe the root hub).
1646 *
1647 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1648 * we don't explicitly enable it here.
1649 */
645daaab 1650 if (udev->do_remote_wakeup) {
1da177e4
LT		 1651 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1652 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1653 USB_DEVICE_REMOTE_WAKEUP, 0,
1654 NULL, 0,
1655 USB_CTRL_SET_TIMEOUT);
1656 if (status)
1657 dev_dbg(&udev->dev,
1658 "won't remote wakeup, status %d\n",
1659 status);
1660 }
1661
1662 /* see 7.1.7.6 */
1663 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1664 if (status) {
1665 dev_dbg(hub->intfdev,
1666 "can't suspend port %d, status %d\n",
1667 port1, status);
1668 /* paranoia: "should not happen" */
1669 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1670 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1671 USB_DEVICE_REMOTE_WAKEUP, 0,
1672 NULL, 0,
1673 USB_CTRL_SET_TIMEOUT);
1674 } else {
1675 /* device has up to 10 msec to fully suspend */
645daaab
AS		 1676 dev_dbg(&udev->dev, "usb %ssuspend\n",
1677 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1678 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1679 msleep(10);
1680 }
1681 return status;
1682}
1683
1684/*
4956eccd
AS		 1685 * usb_port_suspend - suspend a usb device's upstream port
1686 * @udev: device that's no longer in active use
1687 * Context: must be able to sleep; device not locked; pm locks held
1688 *
1689 * Suspends a USB device that isn't in active use, conserving power.
1690 * Devices may wake out of a suspend, if anything important happens,
1691 * using the remote wakeup mechanism. They may also be taken out of
1692 * suspend by the host, using usb_port_resume(). It's also routine
1693 * to disconnect devices while they are suspended.
1694 *
1695 * This only affects the USB hardware for a device; its interfaces
1696 * (and, for hubs, child devices) must already have been suspended.
1697 *
1698 * Suspending OTG devices may trigger HNP, if that's been enabled
1699 * between a pair of dual-role devices. That will change roles, such
1700 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1701 *
1da177e4 1702 * Devices on USB hub ports have only one "suspend" state, corresponding
ba9d35fb 1703 * to ACPI D2, "may cause the device to lose some context".
1da177e4
LT		 1704 * State transitions include:
1705 *
1706 * - suspend, resume ... when the VBUS power link stays live
1707 * - suspend, disconnect ... VBUS lost
1708 *
1709 * Once VBUS drop breaks the circuit, the port it's using has to go through
1710 * normal re-enumeration procedures, starting with enabling VBUS power.
1711 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1712 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1713 * timer, no SRP, no requests through sysfs.
390a8c34
DB		 1714 *
1715 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1716 * the root hub for their bus goes into global suspend ... so we don't
1717 * (falsely) update the device power state to say it suspended.
4956eccd
AS		 1718 *
1719 * Returns 0 on success, else negative errno.
1da177e4 1720 */
4956eccd 1721int usb_port_suspend(struct usb_device *udev)
1da177e4 1722{
f3f3253d 1723 int status = 0;
1da177e4 1724
140d8f68
AS		 1725 /* we change the device's upstream USB link,
1726 * but root hubs have no upstream USB link.
1da177e4 1727 */
f3f3253d 1728 if (udev->parent)
4956eccd
AS		 1729 status = hub_port_suspend(hdev_to_hub(udev->parent),
1730 udev->portnum, udev);
2bf4086d 1731 else {
645daaab
AS		 1732 dev_dbg(&udev->dev, "usb %ssuspend\n",
1733 udev->auto_pm ? "auto-" : "");
2bf4086d
AS		 1734 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1735 }
1da177e4
LT		 1736 return status;
1737}
1738
1da177e4 1739/*
390a8c34
DB		 1740 * If the USB "suspend" state is in use (rather than "global suspend"),
1741 * many devices will be individually taken out of suspend state using
1742 * special" resume" signaling. These routines kick in shortly after
1da177e4
LT		 1743 * hardware resume signaling is finished, either because of selective
1744 * resume (by host) or remote wakeup (by device) ... now see what changed
1745 * in the tree that's rooted at this device.
1746 */
140d8f68 1747static int finish_port_resume(struct usb_device *udev)
1da177e4
LT		 1748{
1749 int status;
1750 u16 devstatus;
1751
1752 /* caller owns the udev device lock */
f3f3253d 1753 dev_dbg(&udev->dev, "finish resume\n");
1da177e4
LT		 1754
1755 /* usb ch9 identifies four variants of SUSPENDED, based on what
1756 * state the device resumes to. Linux currently won't see the
1757 * first two on the host side; they'd be inside hub_port_init()
1758 * during many timeouts, but khubd can't suspend until later.
1759 */
1760 usb_set_device_state(udev, udev->actconfig
1761 ? USB_STATE_CONFIGURED
1762 : USB_STATE_ADDRESS);
1da177e4
LT		 1763
1764 /* 10.5.4.5 says be sure devices in the tree are still there.
1765 * For now let's assume the device didn't go crazy on resume,
1766 * and device drivers will know about any resume quirks.
1767 */
1768 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
b40b7a90
AS		 1769 if (status >= 0)
1770 status = (status == 2 ? 0 : -ENODEV);
1771
1772 if (status)
1da177e4
LT		 1773 dev_dbg(&udev->dev,
1774 "gone after usb resume? status %d\n",
1775 status);
1776 else if (udev->actconfig) {
1da177e4 1777 le16_to_cpus(&devstatus);
55c52718 1778 if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
f3f3253d 1779 && udev->parent) {
1da177e4
LT		 1780 status = usb_control_msg(udev,
1781 usb_sndctrlpipe(udev, 0),
1782 USB_REQ_CLEAR_FEATURE,
1783 USB_RECIP_DEVICE,
1784 USB_DEVICE_REMOTE_WAKEUP, 0,
1785 NULL, 0,
1786 USB_CTRL_SET_TIMEOUT);
a8e7c565 1787 if (status)
1da177e4
LT		 1788 dev_dbg(&udev->dev, "disable remote "
1789 "wakeup, status %d\n", status);
4bf0ba86 1790 }
1da177e4
LT		 1791 status = 0;
1792
1793 } else if (udev->devnum <= 0) {
1794 dev_dbg(&udev->dev, "bogus resume!\n");
1795 status = -EINVAL;
1796 }
1797 return status;
1798}
1799
1800static int
1801hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1802{
1803 int status;
d25450c6
AS		 1804 u16 portchange, portstatus;
1805
1806 /* Skip the initial Clear-Suspend step for a remote wakeup */
1807 status = hub_port_status(hub, port1, &portstatus, &portchange);
1808 if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
1809 goto SuspendCleared;
1da177e4
LT		 1810
1811 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1812
d5cbad4b
AS		 1813 set_bit(port1, hub->busy_bits);
1814
1da177e4
LT		 1815 /* see 7.1.7.7; affects power usage, but not budgeting */
1816 status = clear_port_feature(hub->hdev,
1817 port1, USB_PORT_FEAT_SUSPEND);
1818 if (status) {
1819 dev_dbg(hub->intfdev,
1820 "can't resume port %d, status %d\n",
1821 port1, status);
1822 } else {
1da177e4
LT		 1823 /* drive resume for at least 20 msec */
1824 if (udev)
645daaab
AS		 1825 dev_dbg(&udev->dev, "usb %sresume\n",
1826 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1827 msleep(25);
1828
1829#define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1830 | USB_PORT_STAT_ENABLE \
1831 | USB_PORT_STAT_CONNECTION)
1832
1833 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1834 * stop resume signaling. Then finish the resume
1835 * sequence.
1836 */
d25450c6
AS		 1837 status = hub_port_status(hub, port1, &portstatus, &portchange);
1838SuspendCleared:
1da177e4 1839 if (status < 0
d25450c6
AS		 1840 || (portstatus & LIVE_FLAGS) != LIVE_FLAGS
1841 || (portstatus & USB_PORT_STAT_SUSPEND) != 0
1da177e4
LT		 1842 ) {
1843 dev_dbg(hub->intfdev,
1844 "port %d status %04x.%04x after resume, %d\n",
d25450c6 1845 port1, portchange, portstatus, status);
20307949
AS		 1846 if (status >= 0)
1847 status = -ENODEV;
1da177e4 1848 } else {
20307949
AS		 1849 if (portchange & USB_PORT_STAT_C_SUSPEND)
1850 clear_port_feature(hub->hdev, port1,
1851 USB_PORT_FEAT_C_SUSPEND);
1da177e4
LT		 1852 /* TRSMRCY = 10 msec */
1853 msleep(10);
1854 if (udev)
140d8f68 1855 status = finish_port_resume(udev);
1da177e4
LT		 1856 }
1857 }
1858 if (status < 0)
1859 hub_port_logical_disconnect(hub, port1);
1860
d5cbad4b
AS		 1861 clear_bit(port1, hub->busy_bits);
1862 if (!hub->hdev->parent && !hub->busy_bits[0])
1863 usb_enable_root_hub_irq(hub->hdev->bus);
1864
1da177e4
LT		 1865 return status;
1866}
1867
5edbfb7c 1868/*
140d8f68 1869 * usb_port_resume - re-activate a suspended usb device's upstream port
1da177e4 1870 * @udev: device to re-activate
5edbfb7c 1871 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1872 *
1873 * This will re-activate the suspended device, increasing power usage
1874 * while letting drivers communicate again with its endpoints.
1875 * USB resume explicitly guarantees that the power session between
1876 * the host and the device is the same as it was when the device
1877 * suspended.
1878 *
1879 * Returns 0 on success, else negative errno.
1880 */
140d8f68 1881int usb_port_resume(struct usb_device *udev)
1da177e4 1882{
d388dab7 1883 int status;
1da177e4 1884
140d8f68
AS		 1885 /* we change the device's upstream USB link,
1886 * but root hubs have no upstream USB link.
1887 */
f3f3253d 1888 if (udev->parent) {
114b368c
AS		 1889 // NOTE this fails if parent is also suspended...
1890 status = hub_port_resume(hdev_to_hub(udev->parent),
1891 udev->portnum, udev);
645daaab
AS		 1892 } else {
1893 dev_dbg(&udev->dev, "usb %sresume\n",
1894 udev->auto_pm ? "auto-" : "");
140d8f68 1895 status = finish_port_resume(udev);
645daaab 1896 }
f3f3253d 1897 if (status < 0)
a8e7c565 1898 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
1da177e4
LT		 1899 return status;
1900}
1901
1902static int remote_wakeup(struct usb_device *udev)
1903{
1904 int status = 0;
1905
9ad3d6cc 1906 usb_lock_device(udev);
1da177e4 1907 if (udev->state == USB_STATE_SUSPENDED) {
645daaab 1908 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
1941044a 1909 usb_mark_last_busy(udev);
6b157c9b 1910 status = usb_external_resume_device(udev);
1da177e4 1911 }
9ad3d6cc 1912 usb_unlock_device(udev);
1da177e4
LT		 1913 return status;
1914}
1915
d388dab7
AS		 1916#else /* CONFIG_USB_SUSPEND */
1917
1918/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1919
1920int usb_port_suspend(struct usb_device *udev)
1921{
1922 return 0;
1923}
1924
1925static inline int
1926finish_port_resume(struct usb_device *udev)
1927{
1928 return 0;
1929}
1930
1931static inline int
1932hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1933{
1934 return 0;
1935}
1936
1937int usb_port_resume(struct usb_device *udev)
1938{
1939 return 0;
1940}
1941
1942static inline int remote_wakeup(struct usb_device *udev)
1943{
1944 return 0;
1945}
1946
1947#endif
1948
db690874 1949static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1da177e4
LT		 1950{
1951 struct usb_hub *hub = usb_get_intfdata (intf);
1952 struct usb_device *hdev = hub->hdev;
1953 unsigned port1;
1da177e4 1954
c9f89fa4 1955 /* fail if children aren't already suspended */
1da177e4
LT		 1956 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1957 struct usb_device *udev;
1958
1959 udev = hdev->children [port1-1];
114b368c 1960 if (udev && msg.event == PM_EVENT_SUSPEND &&
f3f3253d 1961#ifdef CONFIG_USB_SUSPEND
114b368c
AS		 1962 udev->state != USB_STATE_SUSPENDED
1963#else
1964 udev->dev.power.power_state.event
1965 == PM_EVENT_ON
f3f3253d 1966#endif
114b368c 1967 ) {
645daaab
AS		 1968 if (!hdev->auto_pm)
1969 dev_dbg(&intf->dev, "port %d nyet suspended\n",
1970 port1);
c9f89fa4
DB		 1971 return -EBUSY;
1972 }
1da177e4
LT		 1973 }
1974
40f122f3
AS		 1975 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1976
12f1ff83
AS		 1977 /* stop khubd and related activity */
1978 hub_quiesce(hub);
b6f6436d 1979 return 0;
1da177e4
LT		 1980}
1981
1982static int hub_resume(struct usb_interface *intf)
1983{
1da177e4 1984 struct usb_hub *hub = usb_get_intfdata (intf);
1da177e4 1985
40f122f3
AS		 1986 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1987
a8e7c565 1988 /* tell khubd to look for changes on this hub */
f3f3253d 1989 hub_activate(hub);
1da177e4
LT		 1990 return 0;
1991}
1992
d388dab7
AS		 1993#else /* CONFIG_PM */
1994
1995static inline int remote_wakeup(struct usb_device *udev)
1996{
1997 return 0;
1998}
1999
511366da
AM		 2000#define hub_suspend NULL
2001#define hub_resume NULL
d388dab7
AS		 2002#endif
2003
1da177e4
LT		 2004
2005/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2006 *
2007 * Between connect detection and reset signaling there must be a delay
2008 * of 100ms at least for debounce and power-settling. The corresponding
2009 * timer shall restart whenever the downstream port detects a disconnect.
2010 *
2011 * Apparently there are some bluetooth and irda-dongles and a number of
2012 * low-speed devices for which this debounce period may last over a second.
2013 * Not covered by the spec - but easy to deal with.
2014 *
2015 * This implementation uses a 1500ms total debounce timeout; if the
2016 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2017 * every 25ms for transient disconnects. When the port status has been
2018 * unchanged for 100ms it returns the port status.
2019 */
2020
2021#define HUB_DEBOUNCE_TIMEOUT 1500
2022#define HUB_DEBOUNCE_STEP 25
2023#define HUB_DEBOUNCE_STABLE 100
2024
2025static int hub_port_debounce(struct usb_hub *hub, int port1)
2026{
2027 int ret;
2028 int total_time, stable_time = 0;
2029 u16 portchange, portstatus;
2030 unsigned connection = 0xffff;
2031
2032 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2033 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2034 if (ret < 0)
2035 return ret;
2036
2037 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2038 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2039 stable_time += HUB_DEBOUNCE_STEP;
2040 if (stable_time >= HUB_DEBOUNCE_STABLE)
2041 break;
2042 } else {
2043 stable_time = 0;
2044 connection = portstatus & USB_PORT_STAT_CONNECTION;
2045 }
2046
2047 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2048 clear_port_feature(hub->hdev, port1,
2049 USB_PORT_FEAT_C_CONNECTION);
2050 }
2051
2052 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2053 break;
2054 msleep(HUB_DEBOUNCE_STEP);
2055 }
2056
2057 dev_dbg (hub->intfdev,
2058 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2059 port1, total_time, stable_time, portstatus);
2060
2061 if (stable_time < HUB_DEBOUNCE_STABLE)
2062 return -ETIMEDOUT;
2063 return portstatus;
2064}
2065
2066static void ep0_reinit(struct usb_device *udev)
2067{
2068 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2069 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2070 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2071}
2072
2073#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2074#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2075
2076static int hub_set_address(struct usb_device *udev)
2077{
2078 int retval;
2079
2080 if (udev->devnum == 0)
2081 return -EINVAL;
2082 if (udev->state == USB_STATE_ADDRESS)
2083 return 0;
2084 if (udev->state != USB_STATE_DEFAULT)
2085 return -EINVAL;
2086 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2087 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2088 NULL, 0, USB_CTRL_SET_TIMEOUT);
2089 if (retval == 0) {
2090 usb_set_device_state(udev, USB_STATE_ADDRESS);
2091 ep0_reinit(udev);
2092 }
2093 return retval;
2094}
2095
2096/* Reset device, (re)assign address, get device descriptor.
2097 * Device connection must be stable, no more debouncing needed.
2098 * Returns device in USB_STATE_ADDRESS, except on error.
2099 *
2100 * If this is called for an already-existing device (as part of
2101 * usb_reset_device), the caller must own the device lock. For a
2102 * newly detected device that is not accessible through any global
2103 * pointers, it's not necessary to lock the device.
2104 */
2105static int
2106hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2107 int retry_counter)
2108{
4186ecf8 2109 static DEFINE_MUTEX(usb_address0_mutex);
1da177e4
LT		 2110
2111 struct usb_device *hdev = hub->hdev;
2112 int i, j, retval;
2113 unsigned delay = HUB_SHORT_RESET_TIME;
2114 enum usb_device_speed oldspeed = udev->speed;
83a07196 2115 char *speed, *type;
1da177e4
LT		 2116
2117 /* root hub ports have a slightly longer reset period
2118 * (from USB 2.0 spec, section 7.1.7.5)
2119 */
2120 if (!hdev->parent) {
2121 delay = HUB_ROOT_RESET_TIME;
2122 if (port1 == hdev->bus->otg_port)
2123 hdev->bus->b_hnp_enable = 0;
2124 }
2125
2126 /* Some low speed devices have problems with the quick delay, so */
2127 /* be a bit pessimistic with those devices. RHbug #23670 */
2128 if (oldspeed == USB_SPEED_LOW)
2129 delay = HUB_LONG_RESET_TIME;
2130
4186ecf8 2131 mutex_lock(&usb_address0_mutex);
1da177e4
LT		 2132
2133 /* Reset the device; full speed may morph to high speed */
2134 retval = hub_port_reset(hub, port1, udev, delay);
2135 if (retval < 0) /* error or disconnect */
2136 goto fail;
2137 /* success, speed is known */
2138 retval = -ENODEV;
2139
2140 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2141 dev_dbg(&udev->dev, "device reset changed speed!\n");
2142 goto fail;
2143 }
2144 oldspeed = udev->speed;
2145
2146 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2147 * it's fixed size except for full speed devices.
5bb6e0ae
IPG		 2148 * For Wireless USB devices, ep0 max packet is always 512 (tho
2149 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
1da177e4
LT		 2150 */
2151 switch (udev->speed) {
5bb6e0ae
IPG		 2152 case USB_SPEED_VARIABLE: /* fixed at 512 */
2153 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
2154 break;
1da177e4
LT		 2155 case USB_SPEED_HIGH: /* fixed at 64 */
2156 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2157 break;
2158 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2159 /* to determine the ep0 maxpacket size, try to read
2160 * the device descriptor to get bMaxPacketSize0 and
2161 * then correct our initial guess.
2162 */
2163 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2164 break;
2165 case USB_SPEED_LOW: /* fixed at 8 */
2166 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2167 break;
2168 default:
2169 goto fail;
2170 }
2171
83a07196
IPG		 2172 type = "";
2173 switch (udev->speed) {
2174 case USB_SPEED_LOW: speed = "low"; break;
2175 case USB_SPEED_FULL: speed = "full"; break;
2176 case USB_SPEED_HIGH: speed = "high"; break;
2177 case USB_SPEED_VARIABLE:
2178 speed = "variable";
2179 type = "Wireless ";
2180 break;
2181 default: speed = "?"; break;
2182 }
1da177e4 2183 dev_info (&udev->dev,
83a07196
IPG		 2184 "%s %s speed %sUSB device using %s and address %d\n",
2185 (udev->config) ? "reset" : "new", speed, type,
2186 udev->bus->controller->driver->name, udev->devnum);
1da177e4
LT		 2187
2188 /* Set up TT records, if needed */
2189 if (hdev->tt) {
2190 udev->tt = hdev->tt;
2191 udev->ttport = hdev->ttport;
2192 } else if (udev->speed != USB_SPEED_HIGH
2193 && hdev->speed == USB_SPEED_HIGH) {
2194 udev->tt = &hub->tt;
2195 udev->ttport = port1;
2196 }
2197
2198 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2199 * Because device hardware and firmware is sometimes buggy in
2200 * this area, and this is how Linux has done it for ages.
2201 * Change it cautiously.
2202 *
2203 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2204 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2205 * so it may help with some non-standards-compliant devices.
2206 * Otherwise we start with SET_ADDRESS and then try to read the
2207 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2208 * value.
2209 */
2210 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2211 if (USE_NEW_SCHEME(retry_counter)) {
2212 struct usb_device_descriptor *buf;
2213 int r = 0;
2214
2215#define GET_DESCRIPTOR_BUFSIZE 64
2216 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2217 if (!buf) {
2218 retval = -ENOMEM;
2219 continue;
2220 }
2221
b89ee19a
AS		 2222 /* Retry on all errors; some devices are flakey.
2223 * 255 is for WUSB devices, we actually need to use
2224 * 512 (WUSB1.0[4.8.1]).
1da177e4
LT		 2225 */
2226 for (j = 0; j < 3; ++j) {
2227 buf->bMaxPacketSize0 = 0;
2228 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2229 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2230 USB_DT_DEVICE << 8, 0,
2231 buf, GET_DESCRIPTOR_BUFSIZE,
b89ee19a 2232 USB_CTRL_GET_TIMEOUT);
1da177e4 2233 switch (buf->bMaxPacketSize0) {
5bb6e0ae 2234 case 8: case 16: case 32: case 64: case 255:
1da177e4
LT		 2235 if (buf->bDescriptorType ==
2236 USB_DT_DEVICE) {
2237 r = 0;
2238 break;
2239 }
2240 /* FALL THROUGH */
2241 default:
2242 if (r == 0)
2243 r = -EPROTO;
2244 break;
2245 }
2246 if (r == 0)
2247 break;
2248 }
2249 udev->descriptor.bMaxPacketSize0 =
2250 buf->bMaxPacketSize0;
2251 kfree(buf);
2252
2253 retval = hub_port_reset(hub, port1, udev, delay);
2254 if (retval < 0) /* error or disconnect */
2255 goto fail;
2256 if (oldspeed != udev->speed) {
2257 dev_dbg(&udev->dev,
2258 "device reset changed speed!\n");
2259 retval = -ENODEV;
2260 goto fail;
2261 }
2262 if (r) {
2263 dev_err(&udev->dev, "device descriptor "
2264 "read/%s, error %d\n",
2265 "64", r);
2266 retval = -EMSGSIZE;
2267 continue;
2268 }
2269#undef GET_DESCRIPTOR_BUFSIZE
2270 }
2271
2272 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2273 retval = hub_set_address(udev);
2274 if (retval >= 0)
2275 break;
2276 msleep(200);
2277 }
2278 if (retval < 0) {
2279 dev_err(&udev->dev,
2280 "device not accepting address %d, error %d\n",
2281 udev->devnum, retval);
2282 goto fail;
2283 }
2284
2285 /* cope with hardware quirkiness:
2286 * - let SET_ADDRESS settle, some device hardware wants it
2287 * - read ep0 maxpacket even for high and low speed,
2288 */
2289 msleep(10);
2290 if (USE_NEW_SCHEME(retry_counter))
2291 break;
2292
2293 retval = usb_get_device_descriptor(udev, 8);
2294 if (retval < 8) {
2295 dev_err(&udev->dev, "device descriptor "
2296 "read/%s, error %d\n",
2297 "8", retval);
2298 if (retval >= 0)
2299 retval = -EMSGSIZE;
2300 } else {
2301 retval = 0;
2302 break;
2303 }
2304 }
2305 if (retval)
2306 goto fail;
2307
5bb6e0ae
IPG		 2308 i = udev->descriptor.bMaxPacketSize0 == 0xff?
2309 512 : udev->descriptor.bMaxPacketSize0;
1da177e4
LT		 2310 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2311 if (udev->speed != USB_SPEED_FULL ||
2312 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2313 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2314 retval = -EMSGSIZE;
2315 goto fail;
2316 }
2317 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2318 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2319 ep0_reinit(udev);
2320 }
2321
2322 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2323 if (retval < (signed)sizeof(udev->descriptor)) {
2324 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2325 "all", retval);
2326 if (retval >= 0)
2327 retval = -ENOMSG;
2328 goto fail;
2329 }
2330
2331 retval = 0;
2332
2333fail:
2334 if (retval)
2335 hub_port_disable(hub, port1, 0);
4186ecf8 2336 mutex_unlock(&usb_address0_mutex);
1da177e4
LT		 2337 return retval;
2338}
2339
2340static void
2341check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2342{
2343 struct usb_qualifier_descriptor *qual;
2344 int status;
2345
e94b1766 2346 qual = kmalloc (sizeof *qual, GFP_KERNEL);
1da177e4
LT		 2347 if (qual == NULL)
2348 return;
2349
2350 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2351 qual, sizeof *qual);
2352 if (status == sizeof *qual) {
2353 dev_info(&udev->dev, "not running at top speed; "
2354 "connect to a high speed hub\n");
2355 /* hub LEDs are probably harder to miss than syslog */
2356 if (hub->has_indicators) {
2357 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
c4028958 2358 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2359 }
2360 }
1bc3c9e1 2361 kfree(qual);
1da177e4
LT		 2362}
2363
2364static unsigned
2365hub_power_remaining (struct usb_hub *hub)
2366{
2367 struct usb_device *hdev = hub->hdev;
2368 int remaining;
55c52718 2369 int port1;
1da177e4 2370
55c52718 2371 if (!hub->limited_power)
1da177e4
LT		 2372 return 0;
2373
55c52718
AS		 2374 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2375 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2376 struct usb_device *udev = hdev->children[port1 - 1];
2377 int delta;
1da177e4
LT		 2378
2379 if (!udev)
2380 continue;
2381
55c52718
AS		 2382 /* Unconfigured devices may not use more than 100mA,
2383 * or 8mA for OTG ports */
1da177e4 2384 if (udev->actconfig)
55c52718
AS		 2385 delta = udev->actconfig->desc.bMaxPower * 2;
2386 else if (port1 != udev->bus->otg_port || hdev->parent)
2387 delta = 100;
1da177e4 2388 else
55c52718
AS		 2389 delta = 8;
2390 if (delta > hub->mA_per_port)
2391 dev_warn(&udev->dev, "%dmA is over %umA budget "
2392 "for port %d!\n",
2393 delta, hub->mA_per_port, port1);
1da177e4
LT		 2394 remaining -= delta;
2395 }
2396 if (remaining < 0) {
55c52718
AS		 2397 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2398 - remaining);
1da177e4
LT		 2399 remaining = 0;
2400 }
2401 return remaining;
2402}
2403
2404/* Handle physical or logical connection change events.
2405 * This routine is called when:
2406 * a port connection-change occurs;
2407 * a port enable-change occurs (often caused by EMI);
2408 * usb_reset_device() encounters changed descriptors (as from
2409 * a firmware download)
2410 * caller already locked the hub
2411 */
2412static void hub_port_connect_change(struct usb_hub *hub, int port1,
2413 u16 portstatus, u16 portchange)
2414{
2415 struct usb_device *hdev = hub->hdev;
2416 struct device *hub_dev = hub->intfdev;
74ad9bd2 2417 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4
LT		 2418 int status, i;
2419
2420 dev_dbg (hub_dev,
2421 "port %d, status %04x, change %04x, %s\n",
2422 port1, portstatus, portchange, portspeed (portstatus));
2423
2424 if (hub->has_indicators) {
2425 set_port_led(hub, port1, HUB_LED_AUTO);
2426 hub->indicator[port1-1] = INDICATOR_AUTO;
2427 }
2428
2429 /* Disconnect any existing devices under this port */
2430 if (hdev->children[port1-1])
2431 usb_disconnect(&hdev->children[port1-1]);
2432 clear_bit(port1, hub->change_bits);
2433
2434#ifdef CONFIG_USB_OTG
2435 /* during HNP, don't repeat the debounce */
2436 if (hdev->bus->is_b_host)
2437 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2438#endif
2439
2440 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2441 status = hub_port_debounce(hub, port1);
d4b7d8e8
AS		 2442 if (status < 0) {
2443 if (printk_ratelimit())
2444 dev_err (hub_dev, "connect-debounce failed, "
2445 "port %d disabled\n", port1);
1da177e4
LT		 2446 goto done;
2447 }
2448 portstatus = status;
2449 }
2450
2451 /* Return now if nothing is connected */
2452 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2453
2454 /* maybe switch power back on (e.g. root hub was reset) */
74ad9bd2 2455 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
1da177e4
LT		 2456 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2457 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2458
2459 if (portstatus & USB_PORT_STAT_ENABLE)
2460 goto done;
2461 return;
2462 }
2463
1da177e4
LT		 2464 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2465 struct usb_device *udev;
2466
2467 /* reallocate for each attempt, since references
2468 * to the previous one can escape in various ways
2469 */
2470 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2471 if (!udev) {
2472 dev_err (hub_dev,
2473 "couldn't allocate port %d usb_device\n",
2474 port1);
2475 goto done;
2476 }
2477
2478 usb_set_device_state(udev, USB_STATE_POWERED);
2479 udev->speed = USB_SPEED_UNKNOWN;
55c52718 2480 udev->bus_mA = hub->mA_per_port;
b6956ffa 2481 udev->level = hdev->level + 1;
55c52718 2482
1da177e4
LT		 2483 /* set the address */
2484 choose_address(udev);
2485 if (udev->devnum <= 0) {
2486 status = -ENOTCONN; /* Don't retry */
2487 goto loop;
2488 }
2489
2490 /* reset and get descriptor */
2491 status = hub_port_init(hub, udev, port1, i);
2492 if (status < 0)
2493 goto loop;
2494
2495 /* consecutive bus-powered hubs aren't reliable; they can
2496 * violate the voltage drop budget. if the new child has
2497 * a "powered" LED, users should notice we didn't enable it
2498 * (without reading syslog), even without per-port LEDs
2499 * on the parent.
2500 */
2501 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
55c52718 2502 && udev->bus_mA <= 100) {
1da177e4
LT		 2503 u16 devstat;
2504
2505 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2506 &devstat);
55c52718 2507 if (status < 2) {
1da177e4
LT		 2508 dev_dbg(&udev->dev, "get status %d ?\n", status);
2509 goto loop_disable;
2510 }
55c52718 2511 le16_to_cpus(&devstat);
1da177e4
LT		 2512 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2513 dev_err(&udev->dev,
2514 "can't connect bus-powered hub "
2515 "to this port\n");
2516 if (hub->has_indicators) {
2517 hub->indicator[port1-1] =
2518 INDICATOR_AMBER_BLINK;
c4028958 2519 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2520 }
2521 status = -ENOTCONN; /* Don't retry */
2522 goto loop_disable;
2523 }
2524 }
2525
2526 /* check for devices running slower than they could */
2527 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2528 && udev->speed == USB_SPEED_FULL
2529 && highspeed_hubs != 0)
2530 check_highspeed (hub, udev, port1);
2531
2532 /* Store the parent's children[] pointer. At this point
2533 * udev becomes globally accessible, although presumably
2534 * no one will look at it until hdev is unlocked.
2535 */
1da177e4
LT		 2536 status = 0;
2537
2538 /* We mustn't add new devices if the parent hub has
2539 * been disconnected; we would race with the
2540 * recursively_mark_NOTATTACHED() routine.
2541 */
2542 spin_lock_irq(&device_state_lock);
2543 if (hdev->state == USB_STATE_NOTATTACHED)
2544 status = -ENOTCONN;
2545 else
2546 hdev->children[port1-1] = udev;
2547 spin_unlock_irq(&device_state_lock);
2548
2549 /* Run it through the hoops (find a driver, etc) */
2550 if (!status) {
2551 status = usb_new_device(udev);
2552 if (status) {
2553 spin_lock_irq(&device_state_lock);
2554 hdev->children[port1-1] = NULL;
2555 spin_unlock_irq(&device_state_lock);
2556 }
2557 }
2558
1da177e4
LT		 2559 if (status)
2560 goto loop_disable;
2561
2562 status = hub_power_remaining(hub);
2563 if (status)
55c52718 2564 dev_dbg(hub_dev, "%dmA power budget left\n", status);
1da177e4
LT		 2565
2566 return;
2567
2568loop_disable:
2569 hub_port_disable(hub, port1, 1);
2570loop:
2571 ep0_reinit(udev);
2572 release_address(udev);
2573 usb_put_dev(udev);
ffcdc18d 2574 if ((status == -ENOTCONN) || (status == -ENOTSUPP))
1da177e4
LT		 2575 break;
2576 }
2577
2578done:
2579 hub_port_disable(hub, port1, 1);
2580}
2581
2582static void hub_events(void)
2583{
2584 struct list_head *tmp;
2585 struct usb_device *hdev;
2586 struct usb_interface *intf;
2587 struct usb_hub *hub;
2588 struct device *hub_dev;
2589 u16 hubstatus;
2590 u16 hubchange;
2591 u16 portstatus;
2592 u16 portchange;
2593 int i, ret;
2594 int connect_change;
2595
2596 /*
2597 * We restart the list every time to avoid a deadlock with
2598 * deleting hubs downstream from this one. This should be
2599 * safe since we delete the hub from the event list.
2600 * Not the most efficient, but avoids deadlocks.
2601 */
2602 while (1) {
2603
2604 /* Grab the first entry at the beginning of the list */
2605 spin_lock_irq(&hub_event_lock);
2606 if (list_empty(&hub_event_list)) {
2607 spin_unlock_irq(&hub_event_lock);
2608 break;
2609 }
2610
2611 tmp = hub_event_list.next;
2612 list_del_init(tmp);
2613
2614 hub = list_entry(tmp, struct usb_hub, event_list);
e8054854
AS		 2615 kref_get(&hub->kref);
2616 spin_unlock_irq(&hub_event_lock);
1da177e4 2617
e8054854
AS		 2618 hdev = hub->hdev;
2619 hub_dev = hub->intfdev;
2620 intf = to_usb_interface(hub_dev);
40f122f3 2621 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
1da177e4
LT		 2622 hdev->state, hub->descriptor
2623 ? hub->descriptor->bNbrPorts
2624 : 0,
2625 /* NOTE: expects max 15 ports... */
2626 (u16) hub->change_bits[0],
40f122f3 2627 (u16) hub->event_bits[0]);
1da177e4 2628
1da177e4
LT		 2629 /* Lock the device, then check to see if we were
2630 * disconnected while waiting for the lock to succeed. */
06b84e8a 2631 usb_lock_device(hdev);
e8054854 2632 if (unlikely(hub->disconnected))
1da177e4
LT		 2633 goto loop;
2634
2635 /* If the hub has died, clean up after it */
2636 if (hdev->state == USB_STATE_NOTATTACHED) {
7de18d8b
AS		 2637 hub->error = -ENODEV;
2638 hub_pre_reset(intf);
1da177e4
LT		 2639 goto loop;
2640 }
2641
40f122f3
AS		 2642 /* Autoresume */
2643 ret = usb_autopm_get_interface(intf);
2644 if (ret) {
2645 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
2646 goto loop;
2647 }
a8e7c565 2648
40f122f3 2649 /* If this is an inactive hub, do nothing */
1da177e4 2650 if (hub->quiescing)
40f122f3 2651 goto loop_autopm;
1da177e4
LT		 2652
2653 if (hub->error) {
2654 dev_dbg (hub_dev, "resetting for error %d\n",
2655 hub->error);
2656
7de18d8b 2657 ret = usb_reset_composite_device(hdev, intf);
1da177e4
LT		 2658 if (ret) {
2659 dev_dbg (hub_dev,
2660 "error resetting hub: %d\n", ret);
40f122f3 2661 goto loop_autopm;
1da177e4
LT		 2662 }
2663
2664 hub->nerrors = 0;
2665 hub->error = 0;
2666 }
2667
2668 /* deal with port status changes */
2669 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2670 if (test_bit(i, hub->busy_bits))
2671 continue;
2672 connect_change = test_bit(i, hub->change_bits);
2673 if (!test_and_clear_bit(i, hub->event_bits) &&
2674 !connect_change && !hub->activating)
2675 continue;
2676
2677 ret = hub_port_status(hub, i,
2678 &portstatus, &portchange);
2679 if (ret < 0)
2680 continue;
2681
2682 if (hub->activating && !hdev->children[i-1] &&
2683 (portstatus &
2684 USB_PORT_STAT_CONNECTION))
2685 connect_change = 1;
2686
2687 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2688 clear_port_feature(hdev, i,
2689 USB_PORT_FEAT_C_CONNECTION);
2690 connect_change = 1;
2691 }
2692
2693 if (portchange & USB_PORT_STAT_C_ENABLE) {
2694 if (!connect_change)
2695 dev_dbg (hub_dev,
2696 "port %d enable change, "
2697 "status %08x\n",
2698 i, portstatus);
2699 clear_port_feature(hdev, i,
2700 USB_PORT_FEAT_C_ENABLE);
2701
2702 /*
2703 * EM interference sometimes causes badly
2704 * shielded USB devices to be shutdown by
2705 * the hub, this hack enables them again.
2706 * Works at least with mouse driver.
2707 */
2708 if (!(portstatus & USB_PORT_STAT_ENABLE)
2709 && !connect_change
2710 && hdev->children[i-1]) {
2711 dev_err (hub_dev,
2712 "port %i "
2713 "disabled by hub (EMI?), "
2714 "re-enabling...\n",
2715 i);
2716 connect_change = 1;
2717 }
2718 }
2719
2720 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2721 clear_port_feature(hdev, i,
2722 USB_PORT_FEAT_C_SUSPEND);
2723 if (hdev->children[i-1]) {
2724 ret = remote_wakeup(hdev->
2725 children[i-1]);
2726 if (ret < 0)
2727 connect_change = 1;
2728 } else {
2729 ret = -ENODEV;
2730 hub_port_disable(hub, i, 1);
2731 }
2732 dev_dbg (hub_dev,
2733 "resume on port %d, status %d\n",
2734 i, ret);
2735 }
2736
2737 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2738 dev_err (hub_dev,
2739 "over-current change on port %d\n",
2740 i);
2741 clear_port_feature(hdev, i,
2742 USB_PORT_FEAT_C_OVER_CURRENT);
2743 hub_power_on(hub);
2744 }
2745
2746 if (portchange & USB_PORT_STAT_C_RESET) {
2747 dev_dbg (hub_dev,
2748 "reset change on port %d\n",
2749 i);
2750 clear_port_feature(hdev, i,
2751 USB_PORT_FEAT_C_RESET);
2752 }
2753
2754 if (connect_change)
2755 hub_port_connect_change(hub, i,
2756 portstatus, portchange);
2757 } /* end for i */
2758
2759 /* deal with hub status changes */
2760 if (test_and_clear_bit(0, hub->event_bits) == 0)
2761 ; /* do nothing */
2762 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2763 dev_err (hub_dev, "get_hub_status failed\n");
2764 else {
2765 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2766 dev_dbg (hub_dev, "power change\n");
2767 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
55c52718
AS		 2768 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2769 /* FIXME: Is this always true? */
2770 hub->limited_power = 0;
2771 else
2772 hub->limited_power = 1;
1da177e4
LT		 2773 }
2774 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2775 dev_dbg (hub_dev, "overcurrent change\n");
2776 msleep(500); /* Cool down */
2777 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2778 hub_power_on(hub);
2779 }
2780 }
2781
2782 hub->activating = 0;
2783
d5926ae7
AS		 2784 /* If this is a root hub, tell the HCD it's okay to
2785 * re-enable port-change interrupts now. */
d5cbad4b 2786 if (!hdev->parent && !hub->busy_bits[0])
d5926ae7
AS		 2787 usb_enable_root_hub_irq(hdev->bus);
2788
40f122f3
AS		 2789loop_autopm:
2790 /* Allow autosuspend if we're not going to run again */
2791 if (list_empty(&hub->event_list))
2792 usb_autopm_enable(intf);
1da177e4
LT		 2793loop:
2794 usb_unlock_device(hdev);
e8054854 2795 kref_put(&hub->kref, hub_release);
1da177e4
LT		 2796
2797 } /* end while (1) */
2798}
2799
2800static int hub_thread(void *__unused)
2801{
1da177e4
LT		 2802 do {
2803 hub_events();
9c8d6178
AM		 2804 wait_event_interruptible(khubd_wait,
2805 !list_empty(&hub_event_list) ||
2806 kthread_should_stop());
3e1d1d28 2807 try_to_freeze();
9c8d6178 2808 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
1da177e4 2809
9c8d6178
AM		 2810 pr_debug("%s: khubd exiting\n", usbcore_name);
2811 return 0;
1da177e4
LT		 2812}
2813
2814static struct usb_device_id hub_id_table [] = {
2815 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2816 .bDeviceClass = USB_CLASS_HUB},
2817 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2818 .bInterfaceClass = USB_CLASS_HUB},
2819 { } /* Terminating entry */
2820};
2821
2822MODULE_DEVICE_TABLE (usb, hub_id_table);
2823
2824static struct usb_driver hub_driver = {
1da177e4
LT		 2825 .name = "hub",
2826 .probe = hub_probe,
2827 .disconnect = hub_disconnect,
2828 .suspend = hub_suspend,
2829 .resume = hub_resume,
7de18d8b
AS		 2830 .pre_reset = hub_pre_reset,
2831 .post_reset = hub_post_reset,
1da177e4
LT		 2832 .ioctl = hub_ioctl,
2833 .id_table = hub_id_table,
40f122f3 2834 .supports_autosuspend = 1,
1da177e4
LT		 2835};
2836
2837int usb_hub_init(void)
2838{
1da177e4
LT		 2839 if (usb_register(&hub_driver) < 0) {
2840 printk(KERN_ERR "%s: can't register hub driver\n",
2841 usbcore_name);
2842 return -1;
2843 }
2844
9c8d6178
AM		 2845 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2846 if (!IS_ERR(khubd_task))
1da177e4 2847 return 0;
1da177e4
LT		 2848
2849 /* Fall through if kernel_thread failed */
2850 usb_deregister(&hub_driver);
2851 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2852
2853 return -1;
2854}
2855
2856void usb_hub_cleanup(void)
2857{
9c8d6178 2858 kthread_stop(khubd_task);
1da177e4
LT		 2859
2860 /*
2861 * Hub resources are freed for us by usb_deregister. It calls
2862 * usb_driver_purge on every device which in turn calls that
2863 * devices disconnect function if it is using this driver.
2864 * The hub_disconnect function takes care of releasing the
2865 * individual hub resources. -greg
2866 */
2867 usb_deregister(&hub_driver);
2868} /* usb_hub_cleanup() */
2869
1da177e4
LT		 2870static int config_descriptors_changed(struct usb_device *udev)
2871{
2872 unsigned index;
2873 unsigned len = 0;
2874 struct usb_config_descriptor *buf;
2875
2876 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2877 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2878 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2879 }
e94b1766 2880 buf = kmalloc (len, GFP_KERNEL);
1da177e4
LT		 2881 if (buf == NULL) {
2882 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2883 /* assume the worst */
2884 return 1;
2885 }
2886 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2887 int length;
2888 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2889
2890 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2891 old_length);
2892 if (length < old_length) {
2893 dev_dbg(&udev->dev, "config index %d, error %d\n",
2894 index, length);
2895 break;
2896 }
2897 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2898 != 0) {
2899 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2900 index, buf->bConfigurationValue);
2901 break;
2902 }
2903 }
2904 kfree(buf);
2905 return index != udev->descriptor.bNumConfigurations;
2906}
2907
2908/**
2909 * usb_reset_device - perform a USB port reset to reinitialize a device
2910 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2911 *
79efa097
AS		 2912 * WARNING - don't use this routine to reset a composite device
2913 * (one with multiple interfaces owned by separate drivers)!
2914 * Use usb_reset_composite_device() instead.
1da177e4
LT		 2915 *
2916 * Do a port reset, reassign the device's address, and establish its
2917 * former operating configuration. If the reset fails, or the device's
2918 * descriptors change from their values before the reset, or the original
2919 * configuration and altsettings cannot be restored, a flag will be set
2920 * telling khubd to pretend the device has been disconnected and then
2921 * re-connected. All drivers will be unbound, and the device will be
2922 * re-enumerated and probed all over again.
2923 *
2924 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2925 * flagged for logical disconnection, or some other negative error code
2926 * if the reset wasn't even attempted.
2927 *
2928 * The caller must own the device lock. For example, it's safe to use
2929 * this from a driver probe() routine after downloading new firmware.
2930 * For calls that might not occur during probe(), drivers should lock
2931 * the device using usb_lock_device_for_reset().
6bc6cff5
AS		 2932 *
2933 * Locking exception: This routine may also be called from within an
2934 * autoresume handler. Such usage won't conflict with other tasks
2935 * holding the device lock because these tasks should always call
2936 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
1da177e4
LT		 2937 */
2938int usb_reset_device(struct usb_device *udev)
2939{
2940 struct usb_device *parent_hdev = udev->parent;
2941 struct usb_hub *parent_hub;
2942 struct usb_device_descriptor descriptor = udev->descriptor;
12c3da34
AS		 2943 int i, ret = 0;
2944 int port1 = udev->portnum;
1da177e4
LT		 2945
2946 if (udev->state == USB_STATE_NOTATTACHED ||
2947 udev->state == USB_STATE_SUSPENDED) {
2948 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2949 udev->state);
2950 return -EINVAL;
2951 }
2952
2953 if (!parent_hdev) {
2954 /* this requires hcd-specific logic; see OHCI hc_restart() */
2955 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2956 return -EISDIR;
2957 }
1da177e4
LT		 2958 parent_hub = hdev_to_hub(parent_hdev);
2959
1da177e4
LT		 2960 set_bit(port1, parent_hub->busy_bits);
2961 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2962
2963 /* ep0 maxpacket size may change; let the HCD know about it.
2964 * Other endpoints will be handled by re-enumeration. */
2965 ep0_reinit(udev);
2966 ret = hub_port_init(parent_hub, udev, port1, i);
dd4dd19e 2967 if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
1da177e4
LT		 2968 break;
2969 }
2970 clear_bit(port1, parent_hub->busy_bits);
d5cbad4b
AS		 2971 if (!parent_hdev->parent && !parent_hub->busy_bits[0])
2972 usb_enable_root_hub_irq(parent_hdev->bus);
2973
1da177e4
LT		 2974 if (ret < 0)
2975 goto re_enumerate;
2976
2977 /* Device might have changed firmware (DFU or similar) */
2978 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
2979 || config_descriptors_changed (udev)) {
2980 dev_info(&udev->dev, "device firmware changed\n");
2981 udev->descriptor = descriptor; /* for disconnect() calls */
2982 goto re_enumerate;
2983 }
2984
2985 if (!udev->actconfig)
2986 goto done;
2987
2988 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2989 USB_REQ_SET_CONFIGURATION, 0,
2990 udev->actconfig->desc.bConfigurationValue, 0,
2991 NULL, 0, USB_CTRL_SET_TIMEOUT);
2992 if (ret < 0) {
2993 dev_err(&udev->dev,
2994 "can't restore configuration #%d (error=%d)\n",
2995 udev->actconfig->desc.bConfigurationValue, ret);
2996 goto re_enumerate;
2997 }
2998 usb_set_device_state(udev, USB_STATE_CONFIGURED);
2999
3000 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3001 struct usb_interface *intf = udev->actconfig->interface[i];
3002 struct usb_interface_descriptor *desc;
3003
3004 /* set_interface resets host side toggle even
3005 * for altsetting zero. the interface may have no driver.
3006 */
3007 desc = &intf->cur_altsetting->desc;
3008 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3009 desc->bAlternateSetting);
3010 if (ret < 0) {
3011 dev_err(&udev->dev, "failed to restore interface %d "
3012 "altsetting %d (error=%d)\n",
3013 desc->bInterfaceNumber,
3014 desc->bAlternateSetting,
3015 ret);
3016 goto re_enumerate;
3017 }
3018 }
3019
3020done:
1da177e4
LT		 3021 return 0;
3022
3023re_enumerate:
3024 hub_port_logical_disconnect(parent_hub, port1);
3025 return -ENODEV;
3026}
140d8f68 3027EXPORT_SYMBOL(usb_reset_device);
79efa097
AS		 3028
3029/**
3030 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3031 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3032 * @iface: interface bound to the driver making the request (optional)
3033 *
3034 * Warns all drivers bound to registered interfaces (using their pre_reset
3035 * method), performs the port reset, and then lets the drivers know that
3036 * the reset is over (using their post_reset method).
3037 *
3038 * Return value is the same as for usb_reset_device().
3039 *
3040 * The caller must own the device lock. For example, it's safe to use
3041 * this from a driver probe() routine after downloading new firmware.
3042 * For calls that might not occur during probe(), drivers should lock
3043 * the device using usb_lock_device_for_reset().
3044 *
3045 * The interface locks are acquired during the pre_reset stage and released
3046 * during the post_reset stage. However if iface is not NULL and is
3047 * currently being probed, we assume that the caller already owns its
3048 * lock.
3049 */
3050int usb_reset_composite_device(struct usb_device *udev,
3051 struct usb_interface *iface)
3052{
3053 int ret;
3054 struct usb_host_config *config = udev->actconfig;
3055
3056 if (udev->state == USB_STATE_NOTATTACHED ||
3057 udev->state == USB_STATE_SUSPENDED) {
3058 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3059 udev->state);
3060 return -EINVAL;
3061 }
3062
645daaab 3063 /* Prevent autosuspend during the reset */
94fcda1f 3064 usb_autoresume_device(udev);
645daaab 3065
79efa097
AS		 3066 if (iface && iface->condition != USB_INTERFACE_BINDING)
3067 iface = NULL;
3068
3069 if (config) {
3070 int i;
3071 struct usb_interface *cintf;
3072 struct usb_driver *drv;
3073
3074 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3075 cintf = config->interface[i];
3076 if (cintf != iface)
3077 down(&cintf->dev.sem);
3078 if (device_is_registered(&cintf->dev) &&
3079 cintf->dev.driver) {
3080 drv = to_usb_driver(cintf->dev.driver);
3081 if (drv->pre_reset)
3082 (drv->pre_reset)(cintf);
3083 }
3084 }
3085 }
3086
3087 ret = usb_reset_device(udev);
3088
3089 if (config) {
3090 int i;
3091 struct usb_interface *cintf;
3092 struct usb_driver *drv;
3093
3094 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3095 cintf = config->interface[i];
3096 if (device_is_registered(&cintf->dev) &&
3097 cintf->dev.driver) {
3098 drv = to_usb_driver(cintf->dev.driver);
3099 if (drv->post_reset)
0458d5b4 3100 (drv->post_reset)(cintf, 0);
79efa097
AS		 3101 }
3102 if (cintf != iface)
3103 up(&cintf->dev.sem);
3104 }
3105 }
3106
94fcda1f 3107 usb_autosuspend_device(udev);
79efa097
AS		 3108 return ret;
3109}
140d8f68 3110EXPORT_SYMBOL(usb_reset_composite_device);
kernel source for telekom puls (alcatel/mediatek)