]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - drivers/usb/core/hub.c
USB: remove phidget drivers from kernel tree.
[mirror_ubuntu-bionic-kernel.git] / drivers / usb / core / hub.c
CommitLineData
1da177e4
LT
1/*
2 * USB hub driver.
3 *
4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
8 *
9 */
10
1da177e4
LT
11#include <linux/kernel.h>
12#include <linux/errno.h>
13#include <linux/module.h>
14#include <linux/moduleparam.h>
15#include <linux/completion.h>
16#include <linux/sched.h>
17#include <linux/list.h>
18#include <linux/slab.h>
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 25
1da177e4
LT
26#include <asm/uaccess.h>
27#include <asm/byteorder.h>
28
29#include "usb.h"
30#include "hcd.h"
31#include "hub.h"
32
f2a383e4
GKH
33/* if we are in debug mode, always announce new devices */
34#ifdef DEBUG
35#ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
36#define CONFIG_USB_ANNOUNCE_NEW_DEVICES
37#endif
38#endif
39
1bb5f66b
AS
40struct usb_hub {
41 struct device *intfdev; /* the "interface" device */
42 struct usb_device *hdev;
e8054854 43 struct kref kref;
1bb5f66b
AS
44 struct urb *urb; /* for interrupt polling pipe */
45
46 /* buffer for urb ... with extra space in case of babble */
47 char (*buffer)[8];
48 dma_addr_t buffer_dma; /* DMA address for buffer */
49 union {
50 struct usb_hub_status hub;
51 struct usb_port_status port;
52 } *status; /* buffer for status reports */
db90e7a1 53 struct mutex status_mutex; /* for the status buffer */
1bb5f66b
AS
54
55 int error; /* last reported error */
56 int nerrors; /* track consecutive errors */
57
58 struct list_head event_list; /* hubs w/data or errs ready */
59 unsigned long event_bits[1]; /* status change bitmask */
60 unsigned long change_bits[1]; /* ports with logical connect
61 status change */
62 unsigned long busy_bits[1]; /* ports being reset or
63 resumed */
64#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
65#error event_bits[] is too short!
66#endif
67
68 struct usb_hub_descriptor *descriptor; /* class descriptor */
69 struct usb_tt tt; /* Transaction Translator */
70
71 unsigned mA_per_port; /* current for each child */
72
73 unsigned limited_power:1;
74 unsigned quiescing:1;
e8054854 75 unsigned disconnected:1;
1bb5f66b
AS
76
77 unsigned has_indicators:1;
78 u8 indicator[USB_MAXCHILDREN];
6d5aefb8 79 struct delayed_work leds;
8520f380 80 struct delayed_work init_work;
1bb5f66b
AS
81};
82
83
1da177e4 84/* Protect struct usb_device->state and ->children members
9ad3d6cc 85 * Note: Both are also protected by ->dev.sem, except that ->state can
1da177e4
LT
86 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
87static DEFINE_SPINLOCK(device_state_lock);
88
89/* khubd's worklist and its lock */
90static DEFINE_SPINLOCK(hub_event_lock);
91static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
92
93/* Wakes up khubd */
94static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
95
9c8d6178 96static struct task_struct *khubd_task;
1da177e4
LT
97
98/* cycle leds on hubs that aren't blinking for attention */
99static int blinkenlights = 0;
100module_param (blinkenlights, bool, S_IRUGO);
101MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
102
fd7c519d
JK
103/*
104 * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
105 * 10 seconds to send reply for the initial 64-byte descriptor request.
106 */
107/* define initial 64-byte descriptor request timeout in milliseconds */
108static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT;
109module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR);
b9cef6c3
WF
110MODULE_PARM_DESC(initial_descriptor_timeout,
111 "initial 64-byte descriptor request timeout in milliseconds "
112 "(default 5000 - 5.0 seconds)");
fd7c519d 113
1da177e4
LT
114/*
115 * As of 2.6.10 we introduce a new USB device initialization scheme which
116 * closely resembles the way Windows works. Hopefully it will be compatible
117 * with a wider range of devices than the old scheme. However some previously
118 * working devices may start giving rise to "device not accepting address"
119 * errors; if that happens the user can try the old scheme by adjusting the
120 * following module parameters.
121 *
122 * For maximum flexibility there are two boolean parameters to control the
123 * hub driver's behavior. On the first initialization attempt, if the
124 * "old_scheme_first" parameter is set then the old scheme will be used,
125 * otherwise the new scheme is used. If that fails and "use_both_schemes"
126 * is set, then the driver will make another attempt, using the other scheme.
127 */
128static int old_scheme_first = 0;
129module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
130MODULE_PARM_DESC(old_scheme_first,
131 "start with the old device initialization scheme");
132
133static int use_both_schemes = 1;
134module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
135MODULE_PARM_DESC(use_both_schemes,
136 "try the other device initialization scheme if the "
137 "first one fails");
138
32fe0198
AS
139/* Mutual exclusion for EHCI CF initialization. This interferes with
140 * port reset on some companion controllers.
141 */
142DECLARE_RWSEM(ehci_cf_port_reset_rwsem);
143EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem);
144
948fea37
AS
145#define HUB_DEBOUNCE_TIMEOUT 1500
146#define HUB_DEBOUNCE_STEP 25
147#define HUB_DEBOUNCE_STABLE 100
148
1da177e4 149
742120c6
ML
150static int usb_reset_and_verify_device(struct usb_device *udev);
151
404d5b18 152static inline char *portspeed(int portstatus)
1da177e4
LT
153{
154 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
155 return "480 Mb/s";
156 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
157 return "1.5 Mb/s";
158 else
159 return "12 Mb/s";
160}
1da177e4
LT
161
162/* Note that hdev or one of its children must be locked! */
163static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
164{
165 return usb_get_intfdata(hdev->actconfig->interface[0]);
166}
167
168/* USB 2.0 spec Section 11.24.4.5 */
169static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
170{
171 int i, ret;
172
173 for (i = 0; i < 3; i++) {
174 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
175 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
176 USB_DT_HUB << 8, 0, data, size,
177 USB_CTRL_GET_TIMEOUT);
178 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
179 return ret;
180 }
181 return -EINVAL;
182}
183
184/*
185 * USB 2.0 spec Section 11.24.2.1
186 */
187static int clear_hub_feature(struct usb_device *hdev, int feature)
188{
189 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
190 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
191}
192
193/*
194 * USB 2.0 spec Section 11.24.2.2
195 */
196static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
197{
198 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
199 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
200 NULL, 0, 1000);
201}
202
203/*
204 * USB 2.0 spec Section 11.24.2.13
205 */
206static int set_port_feature(struct usb_device *hdev, int port1, int feature)
207{
208 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
209 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
210 NULL, 0, 1000);
211}
212
213/*
214 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
215 * for info about using port indicators
216 */
217static void set_port_led(
218 struct usb_hub *hub,
219 int port1,
220 int selector
221)
222{
223 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
224 USB_PORT_FEAT_INDICATOR);
225 if (status < 0)
226 dev_dbg (hub->intfdev,
227 "port %d indicator %s status %d\n",
228 port1,
229 ({ char *s; switch (selector) {
230 case HUB_LED_AMBER: s = "amber"; break;
231 case HUB_LED_GREEN: s = "green"; break;
232 case HUB_LED_OFF: s = "off"; break;
233 case HUB_LED_AUTO: s = "auto"; break;
234 default: s = "??"; break;
235 }; s; }),
236 status);
237}
238
239#define LED_CYCLE_PERIOD ((2*HZ)/3)
240
c4028958 241static void led_work (struct work_struct *work)
1da177e4 242{
c4028958
DH
243 struct usb_hub *hub =
244 container_of(work, struct usb_hub, leds.work);
1da177e4
LT
245 struct usb_device *hdev = hub->hdev;
246 unsigned i;
247 unsigned changed = 0;
248 int cursor = -1;
249
250 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
251 return;
252
253 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
254 unsigned selector, mode;
255
256 /* 30%-50% duty cycle */
257
258 switch (hub->indicator[i]) {
259 /* cycle marker */
260 case INDICATOR_CYCLE:
261 cursor = i;
262 selector = HUB_LED_AUTO;
263 mode = INDICATOR_AUTO;
264 break;
265 /* blinking green = sw attention */
266 case INDICATOR_GREEN_BLINK:
267 selector = HUB_LED_GREEN;
268 mode = INDICATOR_GREEN_BLINK_OFF;
269 break;
270 case INDICATOR_GREEN_BLINK_OFF:
271 selector = HUB_LED_OFF;
272 mode = INDICATOR_GREEN_BLINK;
273 break;
274 /* blinking amber = hw attention */
275 case INDICATOR_AMBER_BLINK:
276 selector = HUB_LED_AMBER;
277 mode = INDICATOR_AMBER_BLINK_OFF;
278 break;
279 case INDICATOR_AMBER_BLINK_OFF:
280 selector = HUB_LED_OFF;
281 mode = INDICATOR_AMBER_BLINK;
282 break;
283 /* blink green/amber = reserved */
284 case INDICATOR_ALT_BLINK:
285 selector = HUB_LED_GREEN;
286 mode = INDICATOR_ALT_BLINK_OFF;
287 break;
288 case INDICATOR_ALT_BLINK_OFF:
289 selector = HUB_LED_AMBER;
290 mode = INDICATOR_ALT_BLINK;
291 break;
292 default:
293 continue;
294 }
295 if (selector != HUB_LED_AUTO)
296 changed = 1;
297 set_port_led(hub, i + 1, selector);
298 hub->indicator[i] = mode;
299 }
300 if (!changed && blinkenlights) {
301 cursor++;
302 cursor %= hub->descriptor->bNbrPorts;
303 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
304 hub->indicator[cursor] = INDICATOR_CYCLE;
305 changed++;
306 }
307 if (changed)
308 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
309}
310
311/* use a short timeout for hub/port status fetches */
312#define USB_STS_TIMEOUT 1000
313#define USB_STS_RETRIES 5
314
315/*
316 * USB 2.0 spec Section 11.24.2.6
317 */
318static int get_hub_status(struct usb_device *hdev,
319 struct usb_hub_status *data)
320{
321 int i, status = -ETIMEDOUT;
322
323 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
324 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
325 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
326 data, sizeof(*data), USB_STS_TIMEOUT);
327 }
328 return status;
329}
330
331/*
332 * USB 2.0 spec Section 11.24.2.7
333 */
334static int get_port_status(struct usb_device *hdev, int port1,
335 struct usb_port_status *data)
336{
337 int i, status = -ETIMEDOUT;
338
339 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
340 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
341 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
342 data, sizeof(*data), USB_STS_TIMEOUT);
343 }
344 return status;
345}
346
3eb14915
AS
347static int hub_port_status(struct usb_hub *hub, int port1,
348 u16 *status, u16 *change)
349{
350 int ret;
351
352 mutex_lock(&hub->status_mutex);
353 ret = get_port_status(hub->hdev, port1, &hub->status->port);
354 if (ret < 4) {
355 dev_err(hub->intfdev,
356 "%s failed (err = %d)\n", __func__, ret);
357 if (ret >= 0)
358 ret = -EIO;
359 } else {
360 *status = le16_to_cpu(hub->status->port.wPortStatus);
361 *change = le16_to_cpu(hub->status->port.wPortChange);
362 ret = 0;
363 }
364 mutex_unlock(&hub->status_mutex);
365 return ret;
366}
367
1da177e4
LT
368static void kick_khubd(struct usb_hub *hub)
369{
370 unsigned long flags;
371
40f122f3
AS
372 /* Suppress autosuspend until khubd runs */
373 to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
374
1da177e4 375 spin_lock_irqsave(&hub_event_lock, flags);
2e2c5eea 376 if (!hub->disconnected && list_empty(&hub->event_list)) {
1da177e4
LT
377 list_add_tail(&hub->event_list, &hub_event_list);
378 wake_up(&khubd_wait);
379 }
380 spin_unlock_irqrestore(&hub_event_lock, flags);
381}
382
383void usb_kick_khubd(struct usb_device *hdev)
384{
e8054854 385 /* FIXME: What if hdev isn't bound to the hub driver? */
1da177e4
LT
386 kick_khubd(hdev_to_hub(hdev));
387}
388
389
390/* completion function, fires on port status changes and various faults */
7d12e780 391static void hub_irq(struct urb *urb)
1da177e4 392{
ec17cf1c 393 struct usb_hub *hub = urb->context;
e015268d 394 int status = urb->status;
1da177e4
LT
395 int i;
396 unsigned long bits;
397
e015268d 398 switch (status) {
1da177e4
LT
399 case -ENOENT: /* synchronous unlink */
400 case -ECONNRESET: /* async unlink */
401 case -ESHUTDOWN: /* hardware going away */
402 return;
403
404 default: /* presumably an error */
405 /* Cause a hub reset after 10 consecutive errors */
e015268d 406 dev_dbg (hub->intfdev, "transfer --> %d\n", status);
1da177e4
LT
407 if ((++hub->nerrors < 10) || hub->error)
408 goto resubmit;
e015268d 409 hub->error = status;
1da177e4 410 /* FALL THROUGH */
ec17cf1c 411
1da177e4
LT
412 /* let khubd handle things */
413 case 0: /* we got data: port status changed */
414 bits = 0;
415 for (i = 0; i < urb->actual_length; ++i)
416 bits |= ((unsigned long) ((*hub->buffer)[i]))
417 << (i*8);
418 hub->event_bits[0] = bits;
419 break;
420 }
421
422 hub->nerrors = 0;
423
424 /* Something happened, let khubd figure it out */
425 kick_khubd(hub);
426
427resubmit:
428 if (hub->quiescing)
429 return;
430
431 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
432 && status != -ENODEV && status != -EPERM)
433 dev_err (hub->intfdev, "resubmit --> %d\n", status);
434}
435
436/* USB 2.0 spec Section 11.24.2.3 */
437static inline int
438hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
439{
440 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
441 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
442 tt, NULL, 0, 1000);
443}
444
445/*
446 * enumeration blocks khubd for a long time. we use keventd instead, since
447 * long blocking there is the exception, not the rule. accordingly, HCDs
448 * talking to TTs must queue control transfers (not just bulk and iso), so
449 * both can talk to the same hub concurrently.
450 */
c4028958 451static void hub_tt_kevent (struct work_struct *work)
1da177e4 452{
c4028958
DH
453 struct usb_hub *hub =
454 container_of(work, struct usb_hub, tt.kevent);
1da177e4 455 unsigned long flags;
55e5fdfa 456 int limit = 100;
1da177e4
LT
457
458 spin_lock_irqsave (&hub->tt.lock, flags);
55e5fdfa 459 while (--limit && !list_empty (&hub->tt.clear_list)) {
1da177e4
LT
460 struct list_head *temp;
461 struct usb_tt_clear *clear;
462 struct usb_device *hdev = hub->hdev;
463 int status;
464
465 temp = hub->tt.clear_list.next;
466 clear = list_entry (temp, struct usb_tt_clear, clear_list);
467 list_del (&clear->clear_list);
468
469 /* drop lock so HCD can concurrently report other TT errors */
470 spin_unlock_irqrestore (&hub->tt.lock, flags);
471 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
472 spin_lock_irqsave (&hub->tt.lock, flags);
473
474 if (status)
475 dev_err (&hdev->dev,
476 "clear tt %d (%04x) error %d\n",
477 clear->tt, clear->devinfo, status);
1bc3c9e1 478 kfree(clear);
1da177e4
LT
479 }
480 spin_unlock_irqrestore (&hub->tt.lock, flags);
481}
482
483/**
484 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
485 * @udev: the device whose split transaction failed
486 * @pipe: identifies the endpoint of the failed transaction
487 *
488 * High speed HCDs use this to tell the hub driver that some split control or
489 * bulk transaction failed in a way that requires clearing internal state of
490 * a transaction translator. This is normally detected (and reported) from
491 * interrupt context.
492 *
493 * It may not be possible for that hub to handle additional full (or low)
494 * speed transactions until that state is fully cleared out.
495 */
496void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
497{
498 struct usb_tt *tt = udev->tt;
499 unsigned long flags;
500 struct usb_tt_clear *clear;
501
502 /* we've got to cope with an arbitrary number of pending TT clears,
503 * since each TT has "at least two" buffers that can need it (and
504 * there can be many TTs per hub). even if they're uncommon.
505 */
54e6ecb2 506 if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
1da177e4
LT
507 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
508 /* FIXME recover somehow ... RESET_TT? */
509 return;
510 }
511
512 /* info that CLEAR_TT_BUFFER needs */
513 clear->tt = tt->multi ? udev->ttport : 1;
514 clear->devinfo = usb_pipeendpoint (pipe);
515 clear->devinfo |= udev->devnum << 4;
516 clear->devinfo |= usb_pipecontrol (pipe)
517 ? (USB_ENDPOINT_XFER_CONTROL << 11)
518 : (USB_ENDPOINT_XFER_BULK << 11);
519 if (usb_pipein (pipe))
520 clear->devinfo |= 1 << 15;
521
522 /* tell keventd to clear state for this TT */
523 spin_lock_irqsave (&tt->lock, flags);
524 list_add_tail (&clear->clear_list, &tt->clear_list);
525 schedule_work (&tt->kevent);
526 spin_unlock_irqrestore (&tt->lock, flags);
527}
782e70c6 528EXPORT_SYMBOL_GPL(usb_hub_tt_clear_buffer);
1da177e4 529
8520f380
AS
530/* If do_delay is false, return the number of milliseconds the caller
531 * needs to delay.
532 */
533static unsigned hub_power_on(struct usb_hub *hub, bool do_delay)
1da177e4
LT
534{
535 int port1;
b789696a 536 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
8520f380 537 unsigned delay;
4489a571
AS
538 u16 wHubCharacteristics =
539 le16_to_cpu(hub->descriptor->wHubCharacteristics);
540
541 /* Enable power on each port. Some hubs have reserved values
542 * of LPSM (> 2) in their descriptors, even though they are
543 * USB 2.0 hubs. Some hubs do not implement port-power switching
544 * but only emulate it. In all cases, the ports won't work
545 * unless we send these messages to the hub.
546 */
547 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
1da177e4 548 dev_dbg(hub->intfdev, "enabling power on all ports\n");
4489a571
AS
549 else
550 dev_dbg(hub->intfdev, "trying to enable port power on "
551 "non-switchable hub\n");
552 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
553 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
1da177e4 554
b789696a 555 /* Wait at least 100 msec for power to become stable */
8520f380
AS
556 delay = max(pgood_delay, (unsigned) 100);
557 if (do_delay)
558 msleep(delay);
559 return delay;
1da177e4
LT
560}
561
1da177e4
LT
562static int hub_hub_status(struct usb_hub *hub,
563 u16 *status, u16 *change)
564{
565 int ret;
566
db90e7a1 567 mutex_lock(&hub->status_mutex);
1da177e4
LT
568 ret = get_hub_status(hub->hdev, &hub->status->hub);
569 if (ret < 0)
570 dev_err (hub->intfdev,
441b62c1 571 "%s failed (err = %d)\n", __func__, ret);
1da177e4
LT
572 else {
573 *status = le16_to_cpu(hub->status->hub.wHubStatus);
574 *change = le16_to_cpu(hub->status->hub.wHubChange);
575 ret = 0;
576 }
db90e7a1 577 mutex_unlock(&hub->status_mutex);
1da177e4
LT
578 return ret;
579}
580
8b28c752
AS
581static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
582{
583 struct usb_device *hdev = hub->hdev;
0458d5b4 584 int ret = 0;
8b28c752 585
0458d5b4 586 if (hdev->children[port1-1] && set_state)
8b28c752
AS
587 usb_set_device_state(hdev->children[port1-1],
588 USB_STATE_NOTATTACHED);
0458d5b4
AS
589 if (!hub->error)
590 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
8b28c752
AS
591 if (ret)
592 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
0458d5b4 593 port1, ret);
8b28c752
AS
594 return ret;
595}
596
0458d5b4
AS
597/*
598 * Disable a port and mark a logical connnect-change event, so that some
599 * time later khubd will disconnect() any existing usb_device on the port
600 * and will re-enumerate if there actually is a device attached.
601 */
602static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
603{
604 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
605 hub_port_disable(hub, port1, 1);
7d069b7d 606
0458d5b4
AS
607 /* FIXME let caller ask to power down the port:
608 * - some devices won't enumerate without a VBUS power cycle
609 * - SRP saves power that way
610 * - ... new call, TBD ...
611 * That's easy if this hub can switch power per-port, and
612 * khubd reactivates the port later (timer, SRP, etc).
613 * Powerdown must be optional, because of reset/DFU.
614 */
615
616 set_bit(port1, hub->change_bits);
617 kick_khubd(hub);
618}
619
6ee0b270 620enum hub_activation_type {
8520f380
AS
621 HUB_INIT, HUB_INIT2, HUB_INIT3,
622 HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME,
6ee0b270 623};
5e6effae 624
8520f380
AS
625static void hub_init_func2(struct work_struct *ws);
626static void hub_init_func3(struct work_struct *ws);
627
f2835219 628static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
5e6effae
AS
629{
630 struct usb_device *hdev = hub->hdev;
631 int port1;
f2835219 632 int status;
948fea37 633 bool need_debounce_delay = false;
8520f380
AS
634 unsigned delay;
635
636 /* Continue a partial initialization */
637 if (type == HUB_INIT2)
638 goto init2;
639 if (type == HUB_INIT3)
640 goto init3;
5e6effae 641
f2835219
AS
642 /* After a resume, port power should still be on.
643 * For any other type of activation, turn it on.
644 */
8520f380
AS
645 if (type != HUB_RESUME) {
646
647 /* Speed up system boot by using a delayed_work for the
648 * hub's initial power-up delays. This is pretty awkward
649 * and the implementation looks like a home-brewed sort of
650 * setjmp/longjmp, but it saves at least 100 ms for each
651 * root hub (assuming usbcore is compiled into the kernel
652 * rather than as a module). It adds up.
653 *
654 * This can't be done for HUB_RESUME or HUB_RESET_RESUME
655 * because for those activation types the ports have to be
656 * operational when we return. In theory this could be done
657 * for HUB_POST_RESET, but it's easier not to.
658 */
659 if (type == HUB_INIT) {
660 delay = hub_power_on(hub, false);
661 PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2);
662 schedule_delayed_work(&hub->init_work,
663 msecs_to_jiffies(delay));
61fbeba1
AS
664
665 /* Suppress autosuspend until init is done */
666 to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
8520f380
AS
667 return; /* Continues at init2: below */
668 } else {
669 hub_power_on(hub, true);
670 }
671 }
672 init2:
f2835219 673
6ee0b270
AS
674 /* Check each port and set hub->change_bits to let khubd know
675 * which ports need attention.
5e6effae
AS
676 */
677 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
678 struct usb_device *udev = hdev->children[port1-1];
5e6effae
AS
679 u16 portstatus, portchange;
680
6ee0b270
AS
681 portstatus = portchange = 0;
682 status = hub_port_status(hub, port1, &portstatus, &portchange);
683 if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
684 dev_dbg(hub->intfdev,
685 "port %d: status %04x change %04x\n",
686 port1, portstatus, portchange);
687
688 /* After anything other than HUB_RESUME (i.e., initialization
689 * or any sort of reset), every port should be disabled.
690 * Unconnected ports should likewise be disabled (paranoia),
691 * and so should ports for which we have no usb_device.
692 */
693 if ((portstatus & USB_PORT_STAT_ENABLE) && (
694 type != HUB_RESUME ||
695 !(portstatus & USB_PORT_STAT_CONNECTION) ||
696 !udev ||
697 udev->state == USB_STATE_NOTATTACHED)) {
698 clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
699 portstatus &= ~USB_PORT_STAT_ENABLE;
5e6effae
AS
700 }
701
948fea37
AS
702 /* Clear status-change flags; we'll debounce later */
703 if (portchange & USB_PORT_STAT_C_CONNECTION) {
704 need_debounce_delay = true;
705 clear_port_feature(hub->hdev, port1,
706 USB_PORT_FEAT_C_CONNECTION);
707 }
708 if (portchange & USB_PORT_STAT_C_ENABLE) {
709 need_debounce_delay = true;
710 clear_port_feature(hub->hdev, port1,
711 USB_PORT_FEAT_C_ENABLE);
712 }
713
6ee0b270
AS
714 if (!udev || udev->state == USB_STATE_NOTATTACHED) {
715 /* Tell khubd to disconnect the device or
716 * check for a new connection
717 */
718 if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
719 set_bit(port1, hub->change_bits);
720
721 } else if (portstatus & USB_PORT_STAT_ENABLE) {
722 /* The power session apparently survived the resume.
723 * If there was an overcurrent or suspend change
724 * (i.e., remote wakeup request), have khubd
725 * take care of it.
726 */
727 if (portchange)
728 set_bit(port1, hub->change_bits);
5e6effae 729
6ee0b270 730 } else if (udev->persist_enabled) {
6ee0b270 731#ifdef CONFIG_PM
5e6effae 732 udev->reset_resume = 1;
6ee0b270 733#endif
8808f00c
AS
734 set_bit(port1, hub->change_bits);
735
6ee0b270
AS
736 } else {
737 /* The power session is gone; tell khubd */
738 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
739 set_bit(port1, hub->change_bits);
5e6effae 740 }
5e6effae
AS
741 }
742
948fea37
AS
743 /* If no port-status-change flags were set, we don't need any
744 * debouncing. If flags were set we can try to debounce the
745 * ports all at once right now, instead of letting khubd do them
746 * one at a time later on.
747 *
748 * If any port-status changes do occur during this delay, khubd
749 * will see them later and handle them normally.
750 */
8520f380
AS
751 if (need_debounce_delay) {
752 delay = HUB_DEBOUNCE_STABLE;
753
754 /* Don't do a long sleep inside a workqueue routine */
755 if (type == HUB_INIT2) {
756 PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3);
757 schedule_delayed_work(&hub->init_work,
758 msecs_to_jiffies(delay));
759 return; /* Continues at init3: below */
760 } else {
761 msleep(delay);
762 }
763 }
764 init3:
f2835219
AS
765 hub->quiescing = 0;
766
767 status = usb_submit_urb(hub->urb, GFP_NOIO);
768 if (status < 0)
769 dev_err(hub->intfdev, "activate --> %d\n", status);
770 if (hub->has_indicators && blinkenlights)
771 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
772
773 /* Scan all ports that need attention */
774 kick_khubd(hub);
5e6effae
AS
775}
776
8520f380
AS
777/* Implement the continuations for the delays above */
778static void hub_init_func2(struct work_struct *ws)
779{
780 struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
781
782 hub_activate(hub, HUB_INIT2);
783}
784
785static void hub_init_func3(struct work_struct *ws)
786{
787 struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
788
789 hub_activate(hub, HUB_INIT3);
790}
791
4330354f
AS
792enum hub_quiescing_type {
793 HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND
794};
795
796static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
797{
798 struct usb_device *hdev = hub->hdev;
799 int i;
800
8520f380
AS
801 cancel_delayed_work_sync(&hub->init_work);
802
4330354f
AS
803 /* khubd and related activity won't re-trigger */
804 hub->quiescing = 1;
805
806 if (type != HUB_SUSPEND) {
807 /* Disconnect all the children */
808 for (i = 0; i < hdev->maxchild; ++i) {
809 if (hdev->children[i])
810 usb_disconnect(&hdev->children[i]);
811 }
812 }
813
814 /* Stop khubd and related activity */
815 usb_kill_urb(hub->urb);
816 if (hub->has_indicators)
817 cancel_delayed_work_sync(&hub->leds);
818 if (hub->tt.hub)
819 cancel_work_sync(&hub->tt.kevent);
820}
821
3eb14915
AS
822/* caller has locked the hub device */
823static int hub_pre_reset(struct usb_interface *intf)
824{
825 struct usb_hub *hub = usb_get_intfdata(intf);
826
4330354f 827 hub_quiesce(hub, HUB_PRE_RESET);
f07600cf 828 return 0;
7d069b7d
AS
829}
830
831/* caller has locked the hub device */
f07600cf 832static int hub_post_reset(struct usb_interface *intf)
7d069b7d 833{
7de18d8b
AS
834 struct usb_hub *hub = usb_get_intfdata(intf);
835
f2835219 836 hub_activate(hub, HUB_POST_RESET);
f07600cf 837 return 0;
7d069b7d
AS
838}
839
1da177e4
LT
840static int hub_configure(struct usb_hub *hub,
841 struct usb_endpoint_descriptor *endpoint)
842{
843 struct usb_device *hdev = hub->hdev;
844 struct device *hub_dev = hub->intfdev;
845 u16 hubstatus, hubchange;
74ad9bd2 846 u16 wHubCharacteristics;
1da177e4
LT
847 unsigned int pipe;
848 int maxp, ret;
849 char *message;
850
851 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
852 &hub->buffer_dma);
853 if (!hub->buffer) {
854 message = "can't allocate hub irq buffer";
855 ret = -ENOMEM;
856 goto fail;
857 }
858
859 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
860 if (!hub->status) {
861 message = "can't kmalloc hub status buffer";
862 ret = -ENOMEM;
863 goto fail;
864 }
db90e7a1 865 mutex_init(&hub->status_mutex);
1da177e4
LT
866
867 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
868 if (!hub->descriptor) {
869 message = "can't kmalloc hub descriptor";
870 ret = -ENOMEM;
871 goto fail;
872 }
873
874 /* Request the entire hub descriptor.
875 * hub->descriptor can handle USB_MAXCHILDREN ports,
876 * but the hub can/will return fewer bytes here.
877 */
878 ret = get_hub_descriptor(hdev, hub->descriptor,
879 sizeof(*hub->descriptor));
880 if (ret < 0) {
881 message = "can't read hub descriptor";
882 goto fail;
883 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
884 message = "hub has too many ports!";
885 ret = -ENODEV;
886 goto fail;
887 }
888
889 hdev->maxchild = hub->descriptor->bNbrPorts;
890 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
891 (hdev->maxchild == 1) ? "" : "s");
892
74ad9bd2 893 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4 894
74ad9bd2 895 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
1da177e4
LT
896 int i;
897 char portstr [USB_MAXCHILDREN + 1];
898
899 for (i = 0; i < hdev->maxchild; i++)
900 portstr[i] = hub->descriptor->DeviceRemovable
901 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
902 ? 'F' : 'R';
903 portstr[hdev->maxchild] = 0;
904 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
905 } else
906 dev_dbg(hub_dev, "standalone hub\n");
907
74ad9bd2 908 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1da177e4
LT
909 case 0x00:
910 dev_dbg(hub_dev, "ganged power switching\n");
911 break;
912 case 0x01:
913 dev_dbg(hub_dev, "individual port power switching\n");
914 break;
915 case 0x02:
916 case 0x03:
917 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
918 break;
919 }
920
74ad9bd2 921 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1da177e4
LT
922 case 0x00:
923 dev_dbg(hub_dev, "global over-current protection\n");
924 break;
925 case 0x08:
926 dev_dbg(hub_dev, "individual port over-current protection\n");
927 break;
928 case 0x10:
929 case 0x18:
930 dev_dbg(hub_dev, "no over-current protection\n");
931 break;
932 }
933
934 spin_lock_init (&hub->tt.lock);
935 INIT_LIST_HEAD (&hub->tt.clear_list);
c4028958 936 INIT_WORK (&hub->tt.kevent, hub_tt_kevent);
1da177e4
LT
937 switch (hdev->descriptor.bDeviceProtocol) {
938 case 0:
939 break;
940 case 1:
941 dev_dbg(hub_dev, "Single TT\n");
942 hub->tt.hub = hdev;
943 break;
944 case 2:
945 ret = usb_set_interface(hdev, 0, 1);
946 if (ret == 0) {
947 dev_dbg(hub_dev, "TT per port\n");
948 hub->tt.multi = 1;
949 } else
950 dev_err(hub_dev, "Using single TT (err %d)\n",
951 ret);
952 hub->tt.hub = hdev;
953 break;
954 default:
955 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
956 hdev->descriptor.bDeviceProtocol);
957 break;
958 }
959
e09711ae 960 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
74ad9bd2 961 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
e09711ae
DB
962 case HUB_TTTT_8_BITS:
963 if (hdev->descriptor.bDeviceProtocol != 0) {
964 hub->tt.think_time = 666;
965 dev_dbg(hub_dev, "TT requires at most %d "
966 "FS bit times (%d ns)\n",
967 8, hub->tt.think_time);
968 }
1da177e4 969 break;
e09711ae
DB
970 case HUB_TTTT_16_BITS:
971 hub->tt.think_time = 666 * 2;
972 dev_dbg(hub_dev, "TT requires at most %d "
973 "FS bit times (%d ns)\n",
974 16, hub->tt.think_time);
1da177e4 975 break;
e09711ae
DB
976 case HUB_TTTT_24_BITS:
977 hub->tt.think_time = 666 * 3;
978 dev_dbg(hub_dev, "TT requires at most %d "
979 "FS bit times (%d ns)\n",
980 24, hub->tt.think_time);
1da177e4 981 break;
e09711ae
DB
982 case HUB_TTTT_32_BITS:
983 hub->tt.think_time = 666 * 4;
984 dev_dbg(hub_dev, "TT requires at most %d "
985 "FS bit times (%d ns)\n",
986 32, hub->tt.think_time);
1da177e4
LT
987 break;
988 }
989
990 /* probe() zeroes hub->indicator[] */
74ad9bd2 991 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1da177e4
LT
992 hub->has_indicators = 1;
993 dev_dbg(hub_dev, "Port indicators are supported\n");
994 }
995
996 dev_dbg(hub_dev, "power on to power good time: %dms\n",
997 hub->descriptor->bPwrOn2PwrGood * 2);
998
999 /* power budgeting mostly matters with bus-powered hubs,
1000 * and battery-powered root hubs (may provide just 8 mA).
1001 */
1002 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
55c52718 1003 if (ret < 2) {
1da177e4
LT
1004 message = "can't get hub status";
1005 goto fail;
1006 }
7d35b929
AS
1007 le16_to_cpus(&hubstatus);
1008 if (hdev == hdev->bus->root_hub) {
55c52718
AS
1009 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
1010 hub->mA_per_port = 500;
1011 else {
1012 hub->mA_per_port = hdev->bus_mA;
1013 hub->limited_power = 1;
1014 }
7d35b929 1015 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1da177e4
LT
1016 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
1017 hub->descriptor->bHubContrCurrent);
55c52718
AS
1018 hub->limited_power = 1;
1019 if (hdev->maxchild > 0) {
1020 int remaining = hdev->bus_mA -
1021 hub->descriptor->bHubContrCurrent;
1022
1023 if (remaining < hdev->maxchild * 100)
1024 dev_warn(hub_dev,
1025 "insufficient power available "
1026 "to use all downstream ports\n");
1027 hub->mA_per_port = 100; /* 7.2.1.1 */
1028 }
1029 } else { /* Self-powered external hub */
1030 /* FIXME: What about battery-powered external hubs that
1031 * provide less current per port? */
1032 hub->mA_per_port = 500;
7d35b929 1033 }
55c52718
AS
1034 if (hub->mA_per_port < 500)
1035 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
1036 hub->mA_per_port);
1da177e4
LT
1037
1038 ret = hub_hub_status(hub, &hubstatus, &hubchange);
1039 if (ret < 0) {
1040 message = "can't get hub status";
1041 goto fail;
1042 }
1043
1044 /* local power status reports aren't always correct */
1045 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
1046 dev_dbg(hub_dev, "local power source is %s\n",
1047 (hubstatus & HUB_STATUS_LOCAL_POWER)
1048 ? "lost (inactive)" : "good");
1049
74ad9bd2 1050 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1da177e4
LT
1051 dev_dbg(hub_dev, "%sover-current condition exists\n",
1052 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
1053
88fafff9 1054 /* set up the interrupt endpoint
1055 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
1056 * bytes as USB2.0[11.12.3] says because some hubs are known
1057 * to send more data (and thus cause overflow). For root hubs,
1058 * maxpktsize is defined in hcd.c's fake endpoint descriptors
1059 * to be big enough for at least USB_MAXCHILDREN ports. */
1da177e4
LT
1060 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
1061 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
1062
1063 if (maxp > sizeof(*hub->buffer))
1064 maxp = sizeof(*hub->buffer);
1065
1066 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
1067 if (!hub->urb) {
1068 message = "couldn't allocate interrupt urb";
1069 ret = -ENOMEM;
1070 goto fail;
1071 }
1072
1073 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
1074 hub, endpoint->bInterval);
1075 hub->urb->transfer_dma = hub->buffer_dma;
1076 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1077
1078 /* maybe cycle the hub leds */
1079 if (hub->has_indicators && blinkenlights)
1080 hub->indicator [0] = INDICATOR_CYCLE;
1081
f2835219 1082 hub_activate(hub, HUB_INIT);
1da177e4
LT
1083 return 0;
1084
1085fail:
1086 dev_err (hub_dev, "config failed, %s (err %d)\n",
1087 message, ret);
1088 /* hub_disconnect() frees urb and descriptor */
1089 return ret;
1090}
1091
e8054854
AS
1092static void hub_release(struct kref *kref)
1093{
1094 struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
1095
1096 usb_put_intf(to_usb_interface(hub->intfdev));
1097 kfree(hub);
1098}
1099
1da177e4
LT
1100static unsigned highspeed_hubs;
1101
1102static void hub_disconnect(struct usb_interface *intf)
1103{
1104 struct usb_hub *hub = usb_get_intfdata (intf);
e8054854
AS
1105
1106 /* Take the hub off the event list and don't let it be added again */
1107 spin_lock_irq(&hub_event_lock);
1108 list_del_init(&hub->event_list);
1109 hub->disconnected = 1;
1110 spin_unlock_irq(&hub_event_lock);
1da177e4 1111
7de18d8b
AS
1112 /* Disconnect all children and quiesce the hub */
1113 hub->error = 0;
4330354f 1114 hub_quiesce(hub, HUB_DISCONNECT);
7de18d8b 1115
8b28c752 1116 usb_set_intfdata (intf, NULL);
1da177e4 1117
e8054854 1118 if (hub->hdev->speed == USB_SPEED_HIGH)
1da177e4
LT
1119 highspeed_hubs--;
1120
1da177e4 1121 usb_free_urb(hub->urb);
1bc3c9e1 1122 kfree(hub->descriptor);
1bc3c9e1 1123 kfree(hub->status);
e8054854
AS
1124 usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer,
1125 hub->buffer_dma);
1da177e4 1126
e8054854 1127 kref_put(&hub->kref, hub_release);
1da177e4
LT
1128}
1129
1130static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
1131{
1132 struct usb_host_interface *desc;
1133 struct usb_endpoint_descriptor *endpoint;
1134 struct usb_device *hdev;
1135 struct usb_hub *hub;
1136
1137 desc = intf->cur_altsetting;
1138 hdev = interface_to_usbdev(intf);
1139
38f3ad5e 1140 if (hdev->level == MAX_TOPO_LEVEL) {
b9cef6c3
WF
1141 dev_err(&intf->dev,
1142 "Unsupported bus topology: hub nested too deep\n");
38f3ad5e
FB
1143 return -E2BIG;
1144 }
1145
89ccbdc9
DB
1146#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1147 if (hdev->parent) {
1148 dev_warn(&intf->dev, "ignoring external hub\n");
1149 return -ENODEV;
1150 }
1151#endif
1152
1da177e4
LT
1153 /* Some hubs have a subclass of 1, which AFAICT according to the */
1154 /* specs is not defined, but it works */
1155 if ((desc->desc.bInterfaceSubClass != 0) &&
1156 (desc->desc.bInterfaceSubClass != 1)) {
1157descriptor_error:
1158 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
1159 return -EIO;
1160 }
1161
1162 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1163 if (desc->desc.bNumEndpoints != 1)
1164 goto descriptor_error;
1165
1166 endpoint = &desc->endpoint[0].desc;
1167
fbf81c29
LFC
1168 /* If it's not an interrupt in endpoint, we'd better punt! */
1169 if (!usb_endpoint_is_int_in(endpoint))
1da177e4
LT
1170 goto descriptor_error;
1171
1172 /* We found a hub */
1173 dev_info (&intf->dev, "USB hub found\n");
1174
0a1ef3b5 1175 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1da177e4
LT
1176 if (!hub) {
1177 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
1178 return -ENOMEM;
1179 }
1180
e8054854 1181 kref_init(&hub->kref);
1da177e4
LT
1182 INIT_LIST_HEAD(&hub->event_list);
1183 hub->intfdev = &intf->dev;
1184 hub->hdev = hdev;
c4028958 1185 INIT_DELAYED_WORK(&hub->leds, led_work);
8520f380 1186 INIT_DELAYED_WORK(&hub->init_work, NULL);
e8054854 1187 usb_get_intf(intf);
1da177e4
LT
1188
1189 usb_set_intfdata (intf, hub);
40f122f3 1190 intf->needs_remote_wakeup = 1;
1da177e4
LT
1191
1192 if (hdev->speed == USB_SPEED_HIGH)
1193 highspeed_hubs++;
1194
1195 if (hub_configure(hub, endpoint) >= 0)
1196 return 0;
1197
1198 hub_disconnect (intf);
1199 return -ENODEV;
1200}
1201
1202static int
1203hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
1204{
1205 struct usb_device *hdev = interface_to_usbdev (intf);
1206
1207 /* assert ifno == 0 (part of hub spec) */
1208 switch (code) {
1209 case USBDEVFS_HUB_PORTINFO: {
1210 struct usbdevfs_hub_portinfo *info = user_data;
1211 int i;
1212
1213 spin_lock_irq(&device_state_lock);
1214 if (hdev->devnum <= 0)
1215 info->nports = 0;
1216 else {
1217 info->nports = hdev->maxchild;
1218 for (i = 0; i < info->nports; i++) {
1219 if (hdev->children[i] == NULL)
1220 info->port[i] = 0;
1221 else
1222 info->port[i] =
1223 hdev->children[i]->devnum;
1224 }
1225 }
1226 spin_unlock_irq(&device_state_lock);
1227
1228 return info->nports + 1;
1229 }
1230
1231 default:
1232 return -ENOSYS;
1233 }
1234}
1235
1da177e4 1236
1da177e4
LT
1237static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1238{
1239 int i;
1240
1241 for (i = 0; i < udev->maxchild; ++i) {
1242 if (udev->children[i])
1243 recursively_mark_NOTATTACHED(udev->children[i]);
1244 }
15123006 1245 if (udev->state == USB_STATE_SUSPENDED) {
ee49fb5d 1246 udev->discon_suspended = 1;
15123006
SS
1247 udev->active_duration -= jiffies;
1248 }
1da177e4
LT
1249 udev->state = USB_STATE_NOTATTACHED;
1250}
1251
1252/**
1253 * usb_set_device_state - change a device's current state (usbcore, hcds)
1254 * @udev: pointer to device whose state should be changed
1255 * @new_state: new state value to be stored
1256 *
1257 * udev->state is _not_ fully protected by the device lock. Although
1258 * most transitions are made only while holding the lock, the state can
1259 * can change to USB_STATE_NOTATTACHED at almost any time. This
1260 * is so that devices can be marked as disconnected as soon as possible,
1261 * without having to wait for any semaphores to be released. As a result,
1262 * all changes to any device's state must be protected by the
1263 * device_state_lock spinlock.
1264 *
1265 * Once a device has been added to the device tree, all changes to its state
1266 * should be made using this routine. The state should _not_ be set directly.
1267 *
1268 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1269 * Otherwise udev->state is set to new_state, and if new_state is
1270 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1271 * to USB_STATE_NOTATTACHED.
1272 */
1273void usb_set_device_state(struct usb_device *udev,
1274 enum usb_device_state new_state)
1275{
1276 unsigned long flags;
1277
1278 spin_lock_irqsave(&device_state_lock, flags);
1279 if (udev->state == USB_STATE_NOTATTACHED)
1280 ; /* do nothing */
b94dc6b5 1281 else if (new_state != USB_STATE_NOTATTACHED) {
fb669cc0
DB
1282
1283 /* root hub wakeup capabilities are managed out-of-band
1284 * and may involve silicon errata ... ignore them here.
1285 */
1286 if (udev->parent) {
645daaab
AS
1287 if (udev->state == USB_STATE_SUSPENDED
1288 || new_state == USB_STATE_SUSPENDED)
1289 ; /* No change to wakeup settings */
1290 else if (new_state == USB_STATE_CONFIGURED)
fb669cc0
DB
1291 device_init_wakeup(&udev->dev,
1292 (udev->actconfig->desc.bmAttributes
1293 & USB_CONFIG_ATT_WAKEUP));
645daaab 1294 else
fb669cc0
DB
1295 device_init_wakeup(&udev->dev, 0);
1296 }
15123006
SS
1297 if (udev->state == USB_STATE_SUSPENDED &&
1298 new_state != USB_STATE_SUSPENDED)
1299 udev->active_duration -= jiffies;
1300 else if (new_state == USB_STATE_SUSPENDED &&
1301 udev->state != USB_STATE_SUSPENDED)
1302 udev->active_duration += jiffies;
645daaab 1303 udev->state = new_state;
b94dc6b5 1304 } else
1da177e4
LT
1305 recursively_mark_NOTATTACHED(udev);
1306 spin_unlock_irqrestore(&device_state_lock, flags);
1307}
6da9c990 1308EXPORT_SYMBOL_GPL(usb_set_device_state);
1da177e4 1309
8af548dc
IPG
1310/*
1311 * WUSB devices are simple: they have no hubs behind, so the mapping
1312 * device <-> virtual port number becomes 1:1. Why? to simplify the
1313 * life of the device connection logic in
1314 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
1315 * handshake we need to assign a temporary address in the unauthorized
1316 * space. For simplicity we use the first virtual port number found to
1317 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
1318 * and that becomes it's address [X < 128] or its unauthorized address
1319 * [X | 0x80].
1320 *
1321 * We add 1 as an offset to the one-based USB-stack port number
1322 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
1323 * 0 is reserved by USB for default address; (b) Linux's USB stack
1324 * uses always #1 for the root hub of the controller. So USB stack's
1325 * port #1, which is wusb virtual-port #0 has address #2.
1326 */
1da177e4
LT
1327static void choose_address(struct usb_device *udev)
1328{
1329 int devnum;
1330 struct usb_bus *bus = udev->bus;
1331
1332 /* If khubd ever becomes multithreaded, this will need a lock */
8af548dc
IPG
1333 if (udev->wusb) {
1334 devnum = udev->portnum + 1;
1335 BUG_ON(test_bit(devnum, bus->devmap.devicemap));
1336 } else {
1337 /* Try to allocate the next devnum beginning at
1338 * bus->devnum_next. */
1339 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1340 bus->devnum_next);
1341 if (devnum >= 128)
1342 devnum = find_next_zero_bit(bus->devmap.devicemap,
1343 128, 1);
1344 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1345 }
1da177e4
LT
1346 if (devnum < 128) {
1347 set_bit(devnum, bus->devmap.devicemap);
1348 udev->devnum = devnum;
1349 }
1350}
1351
1352static void release_address(struct usb_device *udev)
1353{
1354 if (udev->devnum > 0) {
1355 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1356 udev->devnum = -1;
1357 }
1358}
1359
4953d141
DV
1360static void update_address(struct usb_device *udev, int devnum)
1361{
1362 /* The address for a WUSB device is managed by wusbcore. */
1363 if (!udev->wusb)
1364 udev->devnum = devnum;
1365}
1366
d5d4db70
AS
1367#ifdef CONFIG_USB_SUSPEND
1368
1369static void usb_stop_pm(struct usb_device *udev)
1370{
1371 /* Synchronize with the ksuspend thread to prevent any more
1372 * autosuspend requests from being submitted, and decrement
1373 * the parent's count of unsuspended children.
1374 */
1375 usb_pm_lock(udev);
1376 if (udev->parent && !udev->discon_suspended)
1377 usb_autosuspend_device(udev->parent);
1378 usb_pm_unlock(udev);
1379
9ac39f28
AS
1380 /* Stop any autosuspend or autoresume requests already submitted */
1381 cancel_delayed_work_sync(&udev->autosuspend);
1382 cancel_work_sync(&udev->autoresume);
d5d4db70
AS
1383}
1384
1385#else
1386
1387static inline void usb_stop_pm(struct usb_device *udev)
1388{ }
1389
1390#endif
1391
1da177e4
LT
1392/**
1393 * usb_disconnect - disconnect a device (usbcore-internal)
1394 * @pdev: pointer to device being disconnected
1395 * Context: !in_interrupt ()
1396 *
1397 * Something got disconnected. Get rid of it and all of its children.
1398 *
1399 * If *pdev is a normal device then the parent hub must already be locked.
1400 * If *pdev is a root hub then this routine will acquire the
1401 * usb_bus_list_lock on behalf of the caller.
1402 *
1403 * Only hub drivers (including virtual root hub drivers for host
1404 * controllers) should ever call this.
1405 *
1406 * This call is synchronous, and may not be used in an interrupt context.
1407 */
1408void usb_disconnect(struct usb_device **pdev)
1409{
1410 struct usb_device *udev = *pdev;
1411 int i;
1412
1413 if (!udev) {
441b62c1 1414 pr_debug ("%s nodev\n", __func__);
1da177e4
LT
1415 return;
1416 }
1417
1418 /* mark the device as inactive, so any further urb submissions for
1419 * this device (and any of its children) will fail immediately.
1420 * this quiesces everyting except pending urbs.
1421 */
1422 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1da177e4
LT
1423 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1424
9ad3d6cc
AS
1425 usb_lock_device(udev);
1426
1da177e4
LT
1427 /* Free up all the children before we remove this device */
1428 for (i = 0; i < USB_MAXCHILDREN; i++) {
1429 if (udev->children[i])
1430 usb_disconnect(&udev->children[i]);
1431 }
1432
1433 /* deallocate hcd/hardware state ... nuking all pending urbs and
1434 * cleaning up all state associated with the current configuration
1435 * so that the hardware is now fully quiesced.
1436 */
782da727 1437 dev_dbg (&udev->dev, "unregistering device\n");
1da177e4 1438 usb_disable_device(udev, 0);
cde217a5 1439 usb_hcd_synchronize_unlinks(udev);
1da177e4 1440
3b23dd6f 1441 usb_remove_ep_devs(&udev->ep0);
782da727
AS
1442 usb_unlock_device(udev);
1443
1444 /* Unregister the device. The device driver is responsible
3b23dd6f
AS
1445 * for de-configuring the device and invoking the remove-device
1446 * notifier chain (used by usbfs and possibly others).
782da727
AS
1447 */
1448 device_del(&udev->dev);
3099e75a 1449
782da727 1450 /* Free the device number and delete the parent's children[]
1da177e4
LT
1451 * (or root_hub) pointer.
1452 */
1da177e4 1453 release_address(udev);
1da177e4
LT
1454
1455 /* Avoid races with recursively_mark_NOTATTACHED() */
1456 spin_lock_irq(&device_state_lock);
1457 *pdev = NULL;
1458 spin_unlock_irq(&device_state_lock);
1459
d5d4db70 1460 usb_stop_pm(udev);
ee49fb5d 1461
782da727 1462 put_device(&udev->dev);
1da177e4
LT
1463}
1464
f2a383e4 1465#ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
1da177e4
LT
1466static void show_string(struct usb_device *udev, char *id, char *string)
1467{
1468 if (!string)
1469 return;
1470 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1471}
1472
f2a383e4
GKH
1473static void announce_device(struct usb_device *udev)
1474{
1475 dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n",
1476 le16_to_cpu(udev->descriptor.idVendor),
1477 le16_to_cpu(udev->descriptor.idProduct));
b9cef6c3
WF
1478 dev_info(&udev->dev,
1479 "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
f2a383e4
GKH
1480 udev->descriptor.iManufacturer,
1481 udev->descriptor.iProduct,
1482 udev->descriptor.iSerialNumber);
1483 show_string(udev, "Product", udev->product);
1484 show_string(udev, "Manufacturer", udev->manufacturer);
1485 show_string(udev, "SerialNumber", udev->serial);
1486}
1da177e4 1487#else
f2a383e4 1488static inline void announce_device(struct usb_device *udev) { }
1da177e4
LT
1489#endif
1490
1da177e4
LT
1491#ifdef CONFIG_USB_OTG
1492#include "otg_whitelist.h"
1493#endif
1494
3ede760f 1495/**
d9d16e8a 1496 * usb_configure_device_otg - FIXME (usbcore-internal)
3ede760f
ON
1497 * @udev: newly addressed device (in ADDRESS state)
1498 *
d9d16e8a 1499 * Do configuration for On-The-Go devices
3ede760f 1500 */
d9d16e8a 1501static int usb_configure_device_otg(struct usb_device *udev)
1da177e4 1502{
d9d16e8a 1503 int err = 0;
1da177e4
LT
1504
1505#ifdef CONFIG_USB_OTG
1506 /*
1507 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1508 * to wake us after we've powered off VBUS; and HNP, switching roles
1509 * "host" to "peripheral". The OTG descriptor helps figure this out.
1510 */
1511 if (!udev->bus->is_b_host
1512 && udev->config
1513 && udev->parent == udev->bus->root_hub) {
1514 struct usb_otg_descriptor *desc = 0;
1515 struct usb_bus *bus = udev->bus;
1516
1517 /* descriptor may appear anywhere in config */
1518 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1519 le16_to_cpu(udev->config[0].desc.wTotalLength),
1520 USB_DT_OTG, (void **) &desc) == 0) {
1521 if (desc->bmAttributes & USB_OTG_HNP) {
12c3da34 1522 unsigned port1 = udev->portnum;
fc849b85 1523
1da177e4
LT
1524 dev_info(&udev->dev,
1525 "Dual-Role OTG device on %sHNP port\n",
1526 (port1 == bus->otg_port)
1527 ? "" : "non-");
1528
1529 /* enable HNP before suspend, it's simpler */
1530 if (port1 == bus->otg_port)
1531 bus->b_hnp_enable = 1;
1532 err = usb_control_msg(udev,
1533 usb_sndctrlpipe(udev, 0),
1534 USB_REQ_SET_FEATURE, 0,
1535 bus->b_hnp_enable
1536 ? USB_DEVICE_B_HNP_ENABLE
1537 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1538 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1539 if (err < 0) {
1540 /* OTG MESSAGE: report errors here,
1541 * customize to match your product.
1542 */
1543 dev_info(&udev->dev,
b9cef6c3 1544 "can't set HNP mode: %d\n",
1da177e4
LT
1545 err);
1546 bus->b_hnp_enable = 0;
1547 }
1548 }
1549 }
1550 }
1551
1552 if (!is_targeted(udev)) {
1553
1554 /* Maybe it can talk to us, though we can't talk to it.
1555 * (Includes HNP test device.)
1556 */
1557 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
634a84f8 1558 err = usb_port_suspend(udev, PMSG_SUSPEND);
1da177e4
LT
1559 if (err < 0)
1560 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1561 }
ffcdc18d 1562 err = -ENOTSUPP;
1da177e4
LT
1563 goto fail;
1564 }
d9d16e8a 1565fail:
1da177e4 1566#endif
d9d16e8a
IPG
1567 return err;
1568}
1569
1570
1571/**
1572 * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal)
1573 * @udev: newly addressed device (in ADDRESS state)
1574 *
1575 * This is only called by usb_new_device() and usb_authorize_device()
1576 * and FIXME -- all comments that apply to them apply here wrt to
1577 * environment.
1578 *
1579 * If the device is WUSB and not authorized, we don't attempt to read
1580 * the string descriptors, as they will be errored out by the device
1581 * until it has been authorized.
1582 */
1583static int usb_configure_device(struct usb_device *udev)
1584{
1585 int err;
1da177e4 1586
d9d16e8a
IPG
1587 if (udev->config == NULL) {
1588 err = usb_get_configuration(udev);
1589 if (err < 0) {
1590 dev_err(&udev->dev, "can't read configurations, error %d\n",
1591 err);
1592 goto fail;
1593 }
1594 }
1595 if (udev->wusb == 1 && udev->authorized == 0) {
1596 udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1597 udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1598 udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1599 }
1600 else {
1601 /* read the standard strings and cache them if present */
1602 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1603 udev->manufacturer = usb_cache_string(udev,
1604 udev->descriptor.iManufacturer);
1605 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1606 }
1607 err = usb_configure_device_otg(udev);
1608fail:
1609 return err;
1610}
1611
1612
1613/**
1614 * usb_new_device - perform initial device setup (usbcore-internal)
1615 * @udev: newly addressed device (in ADDRESS state)
1616 *
1617 * This is called with devices which have been enumerated, but not yet
1618 * configured. The device descriptor is available, but not descriptors
1619 * for any device configuration. The caller must have locked either
1620 * the parent hub (if udev is a normal device) or else the
1621 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1622 * udev has already been installed, but udev is not yet visible through
1623 * sysfs or other filesystem code.
1624 *
1625 * It will return if the device is configured properly or not. Zero if
1626 * the interface was registered with the driver core; else a negative
1627 * errno value.
1628 *
1629 * This call is synchronous, and may not be used in an interrupt context.
1630 *
1631 * Only the hub driver or root-hub registrar should ever call this.
1632 */
1633int usb_new_device(struct usb_device *udev)
1634{
1635 int err;
1636
6cd13201
AS
1637 /* Increment the parent's count of unsuspended children */
1638 if (udev->parent)
1639 usb_autoresume_device(udev->parent);
1640
d9d16e8a
IPG
1641 usb_detect_quirks(udev); /* Determine quirks */
1642 err = usb_configure_device(udev); /* detect & probe dev/intfs */
1643 if (err < 0)
1644 goto fail;
9f8b17e6
KS
1645 /* export the usbdev device-node for libusb */
1646 udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
1647 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1648
6cd13201
AS
1649 /* Tell the world! */
1650 announce_device(udev);
195af2cc 1651
782da727 1652 /* Register the device. The device driver is responsible
3b23dd6f
AS
1653 * for configuring the device and invoking the add-device
1654 * notifier chain (used by usbfs and possibly others).
782da727 1655 */
9f8b17e6 1656 err = device_add(&udev->dev);
1da177e4
LT
1657 if (err) {
1658 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1659 goto fail;
1660 }
9ad3d6cc 1661
3b23dd6f 1662 (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev);
c066475e 1663 return err;
1da177e4
LT
1664
1665fail:
1666 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
6cd13201 1667 usb_stop_pm(udev);
d9d16e8a 1668 return err;
1da177e4
LT
1669}
1670
93993a0a
IPG
1671
1672/**
fd39c86b
RD
1673 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
1674 * @usb_dev: USB device
1675 *
1676 * Move the USB device to a very basic state where interfaces are disabled
1677 * and the device is in fact unconfigured and unusable.
93993a0a
IPG
1678 *
1679 * We share a lock (that we have) with device_del(), so we need to
1680 * defer its call.
1681 */
1682int usb_deauthorize_device(struct usb_device *usb_dev)
1683{
1684 unsigned cnt;
1685 usb_lock_device(usb_dev);
1686 if (usb_dev->authorized == 0)
1687 goto out_unauthorized;
1688 usb_dev->authorized = 0;
1689 usb_set_configuration(usb_dev, -1);
1690 usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1691 usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1692 usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1693 kfree(usb_dev->config);
1694 usb_dev->config = NULL;
1695 for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++)
1696 kfree(usb_dev->rawdescriptors[cnt]);
1697 usb_dev->descriptor.bNumConfigurations = 0;
1698 kfree(usb_dev->rawdescriptors);
1699out_unauthorized:
1700 usb_unlock_device(usb_dev);
1701 return 0;
1702}
1703
1704
1705int usb_authorize_device(struct usb_device *usb_dev)
1706{
1707 int result = 0, c;
1708 usb_lock_device(usb_dev);
1709 if (usb_dev->authorized == 1)
1710 goto out_authorized;
1711 kfree(usb_dev->product);
1712 usb_dev->product = NULL;
1713 kfree(usb_dev->manufacturer);
1714 usb_dev->manufacturer = NULL;
1715 kfree(usb_dev->serial);
1716 usb_dev->serial = NULL;
1717 result = usb_autoresume_device(usb_dev);
1718 if (result < 0) {
1719 dev_err(&usb_dev->dev,
1720 "can't autoresume for authorization: %d\n", result);
1721 goto error_autoresume;
1722 }
1723 result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
1724 if (result < 0) {
1725 dev_err(&usb_dev->dev, "can't re-read device descriptor for "
1726 "authorization: %d\n", result);
1727 goto error_device_descriptor;
1728 }
1729 usb_dev->authorized = 1;
1730 result = usb_configure_device(usb_dev);
1731 if (result < 0)
1732 goto error_configure;
1733 /* Choose and set the configuration. This registers the interfaces
1734 * with the driver core and lets interface drivers bind to them.
1735 */
b5ea060f 1736 c = usb_choose_configuration(usb_dev);
93993a0a
IPG
1737 if (c >= 0) {
1738 result = usb_set_configuration(usb_dev, c);
1739 if (result) {
1740 dev_err(&usb_dev->dev,
1741 "can't set config #%d, error %d\n", c, result);
1742 /* This need not be fatal. The user can try to
1743 * set other configurations. */
1744 }
1745 }
1746 dev_info(&usb_dev->dev, "authorized to connect\n");
1747error_configure:
1748error_device_descriptor:
1749error_autoresume:
1750out_authorized:
1751 usb_unlock_device(usb_dev); // complements locktree
1752 return result;
1753}
1754
1755
0165de09
IPG
1756/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1757static unsigned hub_is_wusb(struct usb_hub *hub)
1758{
1759 struct usb_hcd *hcd;
1760 if (hub->hdev->parent != NULL) /* not a root hub? */
1761 return 0;
1762 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1763 return hcd->wireless;
1764}
1765
1766
1da177e4
LT
1767#define PORT_RESET_TRIES 5
1768#define SET_ADDRESS_TRIES 2
1769#define GET_DESCRIPTOR_TRIES 2
1770#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1771#define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1772
1773#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1774#define HUB_SHORT_RESET_TIME 10
1775#define HUB_LONG_RESET_TIME 200
1776#define HUB_RESET_TIMEOUT 500
1777
1778static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1779 struct usb_device *udev, unsigned int delay)
1780{
1781 int delay_time, ret;
1782 u16 portstatus;
1783 u16 portchange;
1784
1785 for (delay_time = 0;
1786 delay_time < HUB_RESET_TIMEOUT;
1787 delay_time += delay) {
1788 /* wait to give the device a chance to reset */
1789 msleep(delay);
1790
1791 /* read and decode port status */
1792 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1793 if (ret < 0)
1794 return ret;
1795
1796 /* Device went away? */
1797 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1798 return -ENOTCONN;
1799
dd4dd19e 1800 /* bomb out completely if the connection bounced */
1da177e4 1801 if ((portchange & USB_PORT_STAT_C_CONNECTION))
dd4dd19e 1802 return -ENOTCONN;
1da177e4
LT
1803
1804 /* if we`ve finished resetting, then break out of the loop */
1805 if (!(portstatus & USB_PORT_STAT_RESET) &&
1806 (portstatus & USB_PORT_STAT_ENABLE)) {
0165de09
IPG
1807 if (hub_is_wusb(hub))
1808 udev->speed = USB_SPEED_VARIABLE;
1809 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1da177e4
LT
1810 udev->speed = USB_SPEED_HIGH;
1811 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1812 udev->speed = USB_SPEED_LOW;
1813 else
1814 udev->speed = USB_SPEED_FULL;
1815 return 0;
1816 }
1817
1818 /* switch to the long delay after two short delay failures */
1819 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1820 delay = HUB_LONG_RESET_TIME;
1821
1822 dev_dbg (hub->intfdev,
1823 "port %d not reset yet, waiting %dms\n",
1824 port1, delay);
1825 }
1826
1827 return -EBUSY;
1828}
1829
1830static int hub_port_reset(struct usb_hub *hub, int port1,
1831 struct usb_device *udev, unsigned int delay)
1832{
1833 int i, status;
1834
32fe0198
AS
1835 /* Block EHCI CF initialization during the port reset.
1836 * Some companion controllers don't like it when they mix.
1837 */
1838 down_read(&ehci_cf_port_reset_rwsem);
1839
1da177e4
LT
1840 /* Reset the port */
1841 for (i = 0; i < PORT_RESET_TRIES; i++) {
1842 status = set_port_feature(hub->hdev,
1843 port1, USB_PORT_FEAT_RESET);
1844 if (status)
1845 dev_err(hub->intfdev,
1846 "cannot reset port %d (err = %d)\n",
1847 port1, status);
1848 else {
1849 status = hub_port_wait_reset(hub, port1, udev, delay);
dd16525b 1850 if (status && status != -ENOTCONN)
1da177e4
LT
1851 dev_dbg(hub->intfdev,
1852 "port_wait_reset: err = %d\n",
1853 status);
1854 }
1855
1856 /* return on disconnect or reset */
1857 switch (status) {
1858 case 0:
b789696a
DB
1859 /* TRSTRCY = 10 ms; plus some extra */
1860 msleep(10 + 40);
4953d141 1861 update_address(udev, 0);
1da177e4
LT
1862 /* FALL THROUGH */
1863 case -ENOTCONN:
1864 case -ENODEV:
1865 clear_port_feature(hub->hdev,
1866 port1, USB_PORT_FEAT_C_RESET);
1867 /* FIXME need disconnect() for NOTATTACHED device */
1868 usb_set_device_state(udev, status
1869 ? USB_STATE_NOTATTACHED
1870 : USB_STATE_DEFAULT);
32fe0198 1871 goto done;
1da177e4
LT
1872 }
1873
1874 dev_dbg (hub->intfdev,
1875 "port %d not enabled, trying reset again...\n",
1876 port1);
1877 delay = HUB_LONG_RESET_TIME;
1878 }
1879
1880 dev_err (hub->intfdev,
1881 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1882 port1);
1883
32fe0198
AS
1884 done:
1885 up_read(&ehci_cf_port_reset_rwsem);
1da177e4
LT
1886 return status;
1887}
1888
d388dab7 1889#ifdef CONFIG_PM
1da177e4 1890
b01b03f3
AS
1891#define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \
1892 USB_PORT_STAT_SUSPEND)
1893#define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION)
1894
1895/* Determine whether the device on a port is ready for a normal resume,
1896 * is ready for a reset-resume, or should be disconnected.
1897 */
1898static int check_port_resume_type(struct usb_device *udev,
1899 struct usb_hub *hub, int port1,
1900 int status, unsigned portchange, unsigned portstatus)
1901{
1902 /* Is the device still present? */
1903 if (status || (portstatus & MASK_BITS) != WANT_BITS) {
1904 if (status >= 0)
1905 status = -ENODEV;
1906 }
1907
86c57edf
AS
1908 /* Can't do a normal resume if the port isn't enabled,
1909 * so try a reset-resume instead.
1910 */
1911 else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) {
1912 if (udev->persist_enabled)
1913 udev->reset_resume = 1;
1914 else
1915 status = -ENODEV;
1916 }
b01b03f3
AS
1917
1918 if (status) {
1919 dev_dbg(hub->intfdev,
1920 "port %d status %04x.%04x after resume, %d\n",
1921 port1, portchange, portstatus, status);
1922 } else if (udev->reset_resume) {
1923
1924 /* Late port handoff can set status-change bits */
1925 if (portchange & USB_PORT_STAT_C_CONNECTION)
1926 clear_port_feature(hub->hdev, port1,
1927 USB_PORT_FEAT_C_CONNECTION);
1928 if (portchange & USB_PORT_STAT_C_ENABLE)
1929 clear_port_feature(hub->hdev, port1,
1930 USB_PORT_FEAT_C_ENABLE);
1931 }
1932
1933 return status;
1934}
1935
1da177e4
LT
1936#ifdef CONFIG_USB_SUSPEND
1937
1938/*
624d6c07
AS
1939 * usb_port_suspend - suspend a usb device's upstream port
1940 * @udev: device that's no longer in active use, not a root hub
1941 * Context: must be able to sleep; device not locked; pm locks held
1942 *
1943 * Suspends a USB device that isn't in active use, conserving power.
1944 * Devices may wake out of a suspend, if anything important happens,
1945 * using the remote wakeup mechanism. They may also be taken out of
1946 * suspend by the host, using usb_port_resume(). It's also routine
1947 * to disconnect devices while they are suspended.
1948 *
1949 * This only affects the USB hardware for a device; its interfaces
1950 * (and, for hubs, child devices) must already have been suspended.
1951 *
1da177e4
LT
1952 * Selective port suspend reduces power; most suspended devices draw
1953 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1954 * All devices below the suspended port are also suspended.
1955 *
1956 * Devices leave suspend state when the host wakes them up. Some devices
1957 * also support "remote wakeup", where the device can activate the USB
1958 * tree above them to deliver data, such as a keypress or packet. In
1959 * some cases, this wakes the USB host.
624d6c07
AS
1960 *
1961 * Suspending OTG devices may trigger HNP, if that's been enabled
1962 * between a pair of dual-role devices. That will change roles, such
1963 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1964 *
1965 * Devices on USB hub ports have only one "suspend" state, corresponding
1966 * to ACPI D2, "may cause the device to lose some context".
1967 * State transitions include:
1968 *
1969 * - suspend, resume ... when the VBUS power link stays live
1970 * - suspend, disconnect ... VBUS lost
1971 *
1972 * Once VBUS drop breaks the circuit, the port it's using has to go through
1973 * normal re-enumeration procedures, starting with enabling VBUS power.
1974 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1975 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1976 * timer, no SRP, no requests through sysfs.
1977 *
1978 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1979 * the root hub for their bus goes into global suspend ... so we don't
1980 * (falsely) update the device power state to say it suspended.
1981 *
1982 * Returns 0 on success, else negative errno.
1da177e4 1983 */
65bfd296 1984int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
1da177e4 1985{
624d6c07
AS
1986 struct usb_hub *hub = hdev_to_hub(udev->parent);
1987 int port1 = udev->portnum;
1988 int status;
1da177e4
LT
1989
1990 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1991
1992 /* enable remote wakeup when appropriate; this lets the device
1993 * wake up the upstream hub (including maybe the root hub).
1994 *
1995 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1996 * we don't explicitly enable it here.
1997 */
645daaab 1998 if (udev->do_remote_wakeup) {
1da177e4
LT
1999 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2000 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
2001 USB_DEVICE_REMOTE_WAKEUP, 0,
2002 NULL, 0,
2003 USB_CTRL_SET_TIMEOUT);
2004 if (status)
624d6c07
AS
2005 dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
2006 status);
1da177e4
LT
2007 }
2008
2009 /* see 7.1.7.6 */
2010 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
2011 if (status) {
624d6c07
AS
2012 dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
2013 port1, status);
1da177e4
LT
2014 /* paranoia: "should not happen" */
2015 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2016 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
2017 USB_DEVICE_REMOTE_WAKEUP, 0,
2018 NULL, 0,
2019 USB_CTRL_SET_TIMEOUT);
2020 } else {
2021 /* device has up to 10 msec to fully suspend */
645daaab 2022 dev_dbg(&udev->dev, "usb %ssuspend\n",
65bfd296 2023 (msg.event & PM_EVENT_AUTO ? "auto-" : ""));
1da177e4
LT
2024 usb_set_device_state(udev, USB_STATE_SUSPENDED);
2025 msleep(10);
2026 }
2027 return status;
2028}
2029
1da177e4 2030/*
390a8c34
DB
2031 * If the USB "suspend" state is in use (rather than "global suspend"),
2032 * many devices will be individually taken out of suspend state using
54515fe5 2033 * special "resume" signaling. This routine kicks in shortly after
1da177e4
LT
2034 * hardware resume signaling is finished, either because of selective
2035 * resume (by host) or remote wakeup (by device) ... now see what changed
2036 * in the tree that's rooted at this device.
54515fe5
AS
2037 *
2038 * If @udev->reset_resume is set then the device is reset before the
2039 * status check is done.
1da177e4 2040 */
140d8f68 2041static int finish_port_resume(struct usb_device *udev)
1da177e4 2042{
54515fe5 2043 int status = 0;
1da177e4
LT
2044 u16 devstatus;
2045
2046 /* caller owns the udev device lock */
b9cef6c3
WF
2047 dev_dbg(&udev->dev, "%s\n",
2048 udev->reset_resume ? "finish reset-resume" : "finish resume");
1da177e4
LT
2049
2050 /* usb ch9 identifies four variants of SUSPENDED, based on what
2051 * state the device resumes to. Linux currently won't see the
2052 * first two on the host side; they'd be inside hub_port_init()
2053 * during many timeouts, but khubd can't suspend until later.
2054 */
2055 usb_set_device_state(udev, udev->actconfig
2056 ? USB_STATE_CONFIGURED
2057 : USB_STATE_ADDRESS);
1da177e4 2058
54515fe5
AS
2059 /* 10.5.4.5 says not to reset a suspended port if the attached
2060 * device is enabled for remote wakeup. Hence the reset
2061 * operation is carried out here, after the port has been
2062 * resumed.
2063 */
2064 if (udev->reset_resume)
86c57edf 2065 retry_reset_resume:
742120c6 2066 status = usb_reset_and_verify_device(udev);
54515fe5 2067
1da177e4
LT
2068 /* 10.5.4.5 says be sure devices in the tree are still there.
2069 * For now let's assume the device didn't go crazy on resume,
2070 * and device drivers will know about any resume quirks.
2071 */
54515fe5 2072 if (status == 0) {
46dede46 2073 devstatus = 0;
54515fe5
AS
2074 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
2075 if (status >= 0)
46dede46 2076 status = (status > 0 ? 0 : -ENODEV);
86c57edf
AS
2077
2078 /* If a normal resume failed, try doing a reset-resume */
2079 if (status && !udev->reset_resume && udev->persist_enabled) {
2080 dev_dbg(&udev->dev, "retry with reset-resume\n");
2081 udev->reset_resume = 1;
2082 goto retry_reset_resume;
2083 }
54515fe5 2084 }
b40b7a90 2085
624d6c07
AS
2086 if (status) {
2087 dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
2088 status);
2089 } else if (udev->actconfig) {
1da177e4 2090 le16_to_cpus(&devstatus);
686314cf 2091 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
1da177e4
LT
2092 status = usb_control_msg(udev,
2093 usb_sndctrlpipe(udev, 0),
2094 USB_REQ_CLEAR_FEATURE,
2095 USB_RECIP_DEVICE,
2096 USB_DEVICE_REMOTE_WAKEUP, 0,
2097 NULL, 0,
2098 USB_CTRL_SET_TIMEOUT);
a8e7c565 2099 if (status)
b9cef6c3
WF
2100 dev_dbg(&udev->dev,
2101 "disable remote wakeup, status %d\n",
2102 status);
4bf0ba86 2103 }
1da177e4 2104 status = 0;
1da177e4
LT
2105 }
2106 return status;
2107}
2108
624d6c07
AS
2109/*
2110 * usb_port_resume - re-activate a suspended usb device's upstream port
2111 * @udev: device to re-activate, not a root hub
2112 * Context: must be able to sleep; device not locked; pm locks held
2113 *
2114 * This will re-activate the suspended device, increasing power usage
2115 * while letting drivers communicate again with its endpoints.
2116 * USB resume explicitly guarantees that the power session between
2117 * the host and the device is the same as it was when the device
2118 * suspended.
2119 *
feccc30d
AS
2120 * If @udev->reset_resume is set then this routine won't check that the
2121 * port is still enabled. Furthermore, finish_port_resume() above will
54515fe5
AS
2122 * reset @udev. The end result is that a broken power session can be
2123 * recovered and @udev will appear to persist across a loss of VBUS power.
2124 *
2125 * For example, if a host controller doesn't maintain VBUS suspend current
2126 * during a system sleep or is reset when the system wakes up, all the USB
2127 * power sessions below it will be broken. This is especially troublesome
2128 * for mass-storage devices containing mounted filesystems, since the
2129 * device will appear to have disconnected and all the memory mappings
2130 * to it will be lost. Using the USB_PERSIST facility, the device can be
2131 * made to appear as if it had not disconnected.
2132 *
742120c6 2133 * This facility can be dangerous. Although usb_reset_and_verify_device() makes
feccc30d 2134 * every effort to insure that the same device is present after the
54515fe5
AS
2135 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
2136 * quite possible for a device to remain unaltered but its media to be
2137 * changed. If the user replaces a flash memory card while the system is
2138 * asleep, he will have only himself to blame when the filesystem on the
2139 * new card is corrupted and the system crashes.
2140 *
624d6c07
AS
2141 * Returns 0 on success, else negative errno.
2142 */
65bfd296 2143int usb_port_resume(struct usb_device *udev, pm_message_t msg)
1da177e4 2144{
624d6c07
AS
2145 struct usb_hub *hub = hdev_to_hub(udev->parent);
2146 int port1 = udev->portnum;
2147 int status;
2148 u16 portchange, portstatus;
d25450c6
AS
2149
2150 /* Skip the initial Clear-Suspend step for a remote wakeup */
2151 status = hub_port_status(hub, port1, &portstatus, &portchange);
2152 if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
2153 goto SuspendCleared;
1da177e4
LT
2154
2155 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
2156
d5cbad4b
AS
2157 set_bit(port1, hub->busy_bits);
2158
1da177e4
LT
2159 /* see 7.1.7.7; affects power usage, but not budgeting */
2160 status = clear_port_feature(hub->hdev,
2161 port1, USB_PORT_FEAT_SUSPEND);
2162 if (status) {
624d6c07
AS
2163 dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
2164 port1, status);
1da177e4 2165 } else {
1da177e4 2166 /* drive resume for at least 20 msec */
686314cf 2167 dev_dbg(&udev->dev, "usb %sresume\n",
65bfd296 2168 (msg.event & PM_EVENT_AUTO ? "auto-" : ""));
1da177e4
LT
2169 msleep(25);
2170
1da177e4
LT
2171 /* Virtual root hubs can trigger on GET_PORT_STATUS to
2172 * stop resume signaling. Then finish the resume
2173 * sequence.
2174 */
d25450c6 2175 status = hub_port_status(hub, port1, &portstatus, &portchange);
54515fe5 2176
b01b03f3
AS
2177 /* TRSMRCY = 10 msec */
2178 msleep(10);
2179 }
2180
54515fe5 2181 SuspendCleared:
b01b03f3
AS
2182 if (status == 0) {
2183 if (portchange & USB_PORT_STAT_C_SUSPEND)
2184 clear_port_feature(hub->hdev, port1,
2185 USB_PORT_FEAT_C_SUSPEND);
1da177e4 2186 }
1da177e4 2187
d5cbad4b 2188 clear_bit(port1, hub->busy_bits);
d5cbad4b 2189
b01b03f3
AS
2190 status = check_port_resume_type(udev,
2191 hub, port1, status, portchange, portstatus);
54515fe5
AS
2192 if (status == 0)
2193 status = finish_port_resume(udev);
2194 if (status < 0) {
2195 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
2196 hub_port_logical_disconnect(hub, port1);
2197 }
1da177e4
LT
2198 return status;
2199}
2200
8808f00c 2201/* caller has locked udev */
1da177e4
LT
2202static int remote_wakeup(struct usb_device *udev)
2203{
2204 int status = 0;
2205
1da177e4 2206 if (udev->state == USB_STATE_SUSPENDED) {
645daaab 2207 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
1941044a 2208 usb_mark_last_busy(udev);
65bfd296 2209 status = usb_external_resume_device(udev, PMSG_REMOTE_RESUME);
1da177e4 2210 }
1da177e4
LT
2211 return status;
2212}
2213
d388dab7
AS
2214#else /* CONFIG_USB_SUSPEND */
2215
2216/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
2217
65bfd296 2218int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
d388dab7
AS
2219{
2220 return 0;
2221}
2222
b01b03f3
AS
2223/* However we may need to do a reset-resume */
2224
65bfd296 2225int usb_port_resume(struct usb_device *udev, pm_message_t msg)
d388dab7 2226{
b01b03f3
AS
2227 struct usb_hub *hub = hdev_to_hub(udev->parent);
2228 int port1 = udev->portnum;
2229 int status;
2230 u16 portchange, portstatus;
2231
2232 status = hub_port_status(hub, port1, &portstatus, &portchange);
2233 status = check_port_resume_type(udev,
2234 hub, port1, status, portchange, portstatus);
54515fe5 2235
b01b03f3
AS
2236 if (status) {
2237 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
2238 hub_port_logical_disconnect(hub, port1);
2239 } else if (udev->reset_resume) {
54515fe5 2240 dev_dbg(&udev->dev, "reset-resume\n");
742120c6 2241 status = usb_reset_and_verify_device(udev);
54515fe5
AS
2242 }
2243 return status;
d388dab7
AS
2244}
2245
2246static inline int remote_wakeup(struct usb_device *udev)
2247{
2248 return 0;
2249}
2250
2251#endif
2252
db690874 2253static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1da177e4
LT
2254{
2255 struct usb_hub *hub = usb_get_intfdata (intf);
2256 struct usb_device *hdev = hub->hdev;
2257 unsigned port1;
1da177e4 2258
c9f89fa4 2259 /* fail if children aren't already suspended */
1da177e4
LT
2260 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
2261 struct usb_device *udev;
2262
2263 udev = hdev->children [port1-1];
6840d255 2264 if (udev && udev->can_submit) {
65bfd296 2265 if (!(msg.event & PM_EVENT_AUTO))
645daaab
AS
2266 dev_dbg(&intf->dev, "port %d nyet suspended\n",
2267 port1);
c9f89fa4
DB
2268 return -EBUSY;
2269 }
1da177e4
LT
2270 }
2271
441b62c1 2272 dev_dbg(&intf->dev, "%s\n", __func__);
40f122f3 2273
12f1ff83 2274 /* stop khubd and related activity */
4330354f 2275 hub_quiesce(hub, HUB_SUSPEND);
b6f6436d 2276 return 0;
1da177e4
LT
2277}
2278
2279static int hub_resume(struct usb_interface *intf)
2280{
5e6effae 2281 struct usb_hub *hub = usb_get_intfdata(intf);
40f122f3 2282
5e6effae 2283 dev_dbg(&intf->dev, "%s\n", __func__);
f2835219 2284 hub_activate(hub, HUB_RESUME);
1da177e4
LT
2285 return 0;
2286}
2287
b41a60ec 2288static int hub_reset_resume(struct usb_interface *intf)
f07600cf 2289{
b41a60ec 2290 struct usb_hub *hub = usb_get_intfdata(intf);
f07600cf 2291
5e6effae 2292 dev_dbg(&intf->dev, "%s\n", __func__);
f2835219 2293 hub_activate(hub, HUB_RESET_RESUME);
f07600cf
AS
2294 return 0;
2295}
2296
54515fe5
AS
2297/**
2298 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
2299 * @rhdev: struct usb_device for the root hub
2300 *
2301 * The USB host controller driver calls this function when its root hub
2302 * is resumed and Vbus power has been interrupted or the controller
feccc30d
AS
2303 * has been reset. The routine marks @rhdev as having lost power.
2304 * When the hub driver is resumed it will take notice and carry out
2305 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
2306 * the others will be disconnected.
54515fe5
AS
2307 */
2308void usb_root_hub_lost_power(struct usb_device *rhdev)
2309{
2310 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
2311 rhdev->reset_resume = 1;
2312}
2313EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
2314
d388dab7
AS
2315#else /* CONFIG_PM */
2316
2317static inline int remote_wakeup(struct usb_device *udev)
2318{
2319 return 0;
2320}
2321
f07600cf
AS
2322#define hub_suspend NULL
2323#define hub_resume NULL
2324#define hub_reset_resume NULL
d388dab7
AS
2325#endif
2326
1da177e4
LT
2327
2328/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2329 *
2330 * Between connect detection and reset signaling there must be a delay
2331 * of 100ms at least for debounce and power-settling. The corresponding
2332 * timer shall restart whenever the downstream port detects a disconnect.
2333 *
2334 * Apparently there are some bluetooth and irda-dongles and a number of
2335 * low-speed devices for which this debounce period may last over a second.
2336 * Not covered by the spec - but easy to deal with.
2337 *
2338 * This implementation uses a 1500ms total debounce timeout; if the
2339 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2340 * every 25ms for transient disconnects. When the port status has been
2341 * unchanged for 100ms it returns the port status.
2342 */
1da177e4
LT
2343static int hub_port_debounce(struct usb_hub *hub, int port1)
2344{
2345 int ret;
2346 int total_time, stable_time = 0;
2347 u16 portchange, portstatus;
2348 unsigned connection = 0xffff;
2349
2350 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2351 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2352 if (ret < 0)
2353 return ret;
2354
2355 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2356 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2357 stable_time += HUB_DEBOUNCE_STEP;
2358 if (stable_time >= HUB_DEBOUNCE_STABLE)
2359 break;
2360 } else {
2361 stable_time = 0;
2362 connection = portstatus & USB_PORT_STAT_CONNECTION;
2363 }
2364
2365 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2366 clear_port_feature(hub->hdev, port1,
2367 USB_PORT_FEAT_C_CONNECTION);
2368 }
2369
2370 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2371 break;
2372 msleep(HUB_DEBOUNCE_STEP);
2373 }
2374
2375 dev_dbg (hub->intfdev,
2376 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2377 port1, total_time, stable_time, portstatus);
2378
2379 if (stable_time < HUB_DEBOUNCE_STABLE)
2380 return -ETIMEDOUT;
2381 return portstatus;
2382}
2383
fc721f51 2384void usb_ep0_reinit(struct usb_device *udev)
1da177e4 2385{
ddeac4e7
AS
2386 usb_disable_endpoint(udev, 0 + USB_DIR_IN, true);
2387 usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true);
2caf7fcd 2388 usb_enable_endpoint(udev, &udev->ep0, true);
1da177e4 2389}
fc721f51 2390EXPORT_SYMBOL_GPL(usb_ep0_reinit);
1da177e4
LT
2391
2392#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2393#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2394
4326ed0b 2395static int hub_set_address(struct usb_device *udev, int devnum)
1da177e4
LT
2396{
2397 int retval;
2398
4326ed0b 2399 if (devnum <= 1)
1da177e4
LT
2400 return -EINVAL;
2401 if (udev->state == USB_STATE_ADDRESS)
2402 return 0;
2403 if (udev->state != USB_STATE_DEFAULT)
2404 return -EINVAL;
2405 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
4326ed0b 2406 USB_REQ_SET_ADDRESS, 0, devnum, 0,
1da177e4
LT
2407 NULL, 0, USB_CTRL_SET_TIMEOUT);
2408 if (retval == 0) {
4953d141
DV
2409 /* Device now using proper address. */
2410 update_address(udev, devnum);
1da177e4 2411 usb_set_device_state(udev, USB_STATE_ADDRESS);
fc721f51 2412 usb_ep0_reinit(udev);
1da177e4
LT
2413 }
2414 return retval;
2415}
2416
2417/* Reset device, (re)assign address, get device descriptor.
2418 * Device connection must be stable, no more debouncing needed.
2419 * Returns device in USB_STATE_ADDRESS, except on error.
2420 *
2421 * If this is called for an already-existing device (as part of
742120c6 2422 * usb_reset_and_verify_device), the caller must own the device lock. For a
1da177e4
LT
2423 * newly detected device that is not accessible through any global
2424 * pointers, it's not necessary to lock the device.
2425 */
2426static int
2427hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2428 int retry_counter)
2429{
4186ecf8 2430 static DEFINE_MUTEX(usb_address0_mutex);
1da177e4
LT
2431
2432 struct usb_device *hdev = hub->hdev;
2433 int i, j, retval;
2434 unsigned delay = HUB_SHORT_RESET_TIME;
2435 enum usb_device_speed oldspeed = udev->speed;
83a07196 2436 char *speed, *type;
4326ed0b 2437 int devnum = udev->devnum;
1da177e4
LT
2438
2439 /* root hub ports have a slightly longer reset period
2440 * (from USB 2.0 spec, section 7.1.7.5)
2441 */
2442 if (!hdev->parent) {
2443 delay = HUB_ROOT_RESET_TIME;
2444 if (port1 == hdev->bus->otg_port)
2445 hdev->bus->b_hnp_enable = 0;
2446 }
2447
2448 /* Some low speed devices have problems with the quick delay, so */
2449 /* be a bit pessimistic with those devices. RHbug #23670 */
2450 if (oldspeed == USB_SPEED_LOW)
2451 delay = HUB_LONG_RESET_TIME;
2452
4186ecf8 2453 mutex_lock(&usb_address0_mutex);
1da177e4
LT
2454
2455 /* Reset the device; full speed may morph to high speed */
2456 retval = hub_port_reset(hub, port1, udev, delay);
2457 if (retval < 0) /* error or disconnect */
2458 goto fail;
2459 /* success, speed is known */
2460 retval = -ENODEV;
2461
2462 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2463 dev_dbg(&udev->dev, "device reset changed speed!\n");
2464 goto fail;
2465 }
2466 oldspeed = udev->speed;
4326ed0b 2467
1da177e4
LT
2468 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2469 * it's fixed size except for full speed devices.
5bb6e0ae
IPG
2470 * For Wireless USB devices, ep0 max packet is always 512 (tho
2471 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
1da177e4
LT
2472 */
2473 switch (udev->speed) {
5bb6e0ae 2474 case USB_SPEED_VARIABLE: /* fixed at 512 */
551509d2 2475 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
5bb6e0ae 2476 break;
1da177e4 2477 case USB_SPEED_HIGH: /* fixed at 64 */
551509d2 2478 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
1da177e4
LT
2479 break;
2480 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2481 /* to determine the ep0 maxpacket size, try to read
2482 * the device descriptor to get bMaxPacketSize0 and
2483 * then correct our initial guess.
2484 */
551509d2 2485 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
1da177e4
LT
2486 break;
2487 case USB_SPEED_LOW: /* fixed at 8 */
551509d2 2488 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8);
1da177e4
LT
2489 break;
2490 default:
2491 goto fail;
2492 }
2493
83a07196
IPG
2494 type = "";
2495 switch (udev->speed) {
2496 case USB_SPEED_LOW: speed = "low"; break;
2497 case USB_SPEED_FULL: speed = "full"; break;
2498 case USB_SPEED_HIGH: speed = "high"; break;
2499 case USB_SPEED_VARIABLE:
2500 speed = "variable";
2501 type = "Wireless ";
2502 break;
2503 default: speed = "?"; break;
2504 }
1da177e4 2505 dev_info (&udev->dev,
83a07196
IPG
2506 "%s %s speed %sUSB device using %s and address %d\n",
2507 (udev->config) ? "reset" : "new", speed, type,
4326ed0b 2508 udev->bus->controller->driver->name, devnum);
1da177e4
LT
2509
2510 /* Set up TT records, if needed */
2511 if (hdev->tt) {
2512 udev->tt = hdev->tt;
2513 udev->ttport = hdev->ttport;
2514 } else if (udev->speed != USB_SPEED_HIGH
2515 && hdev->speed == USB_SPEED_HIGH) {
2516 udev->tt = &hub->tt;
2517 udev->ttport = port1;
2518 }
2519
2520 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2521 * Because device hardware and firmware is sometimes buggy in
2522 * this area, and this is how Linux has done it for ages.
2523 * Change it cautiously.
2524 *
2525 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2526 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2527 * so it may help with some non-standards-compliant devices.
2528 * Otherwise we start with SET_ADDRESS and then try to read the
2529 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2530 * value.
2531 */
2532 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2533 if (USE_NEW_SCHEME(retry_counter)) {
2534 struct usb_device_descriptor *buf;
2535 int r = 0;
2536
2537#define GET_DESCRIPTOR_BUFSIZE 64
2538 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2539 if (!buf) {
2540 retval = -ENOMEM;
2541 continue;
2542 }
2543
b89ee19a
AS
2544 /* Retry on all errors; some devices are flakey.
2545 * 255 is for WUSB devices, we actually need to use
2546 * 512 (WUSB1.0[4.8.1]).
1da177e4
LT
2547 */
2548 for (j = 0; j < 3; ++j) {
2549 buf->bMaxPacketSize0 = 0;
2550 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2551 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2552 USB_DT_DEVICE << 8, 0,
2553 buf, GET_DESCRIPTOR_BUFSIZE,
fd7c519d 2554 initial_descriptor_timeout);
1da177e4 2555 switch (buf->bMaxPacketSize0) {
5bb6e0ae 2556 case 8: case 16: case 32: case 64: case 255:
1da177e4
LT
2557 if (buf->bDescriptorType ==
2558 USB_DT_DEVICE) {
2559 r = 0;
2560 break;
2561 }
2562 /* FALL THROUGH */
2563 default:
2564 if (r == 0)
2565 r = -EPROTO;
2566 break;
2567 }
2568 if (r == 0)
2569 break;
2570 }
2571 udev->descriptor.bMaxPacketSize0 =
2572 buf->bMaxPacketSize0;
2573 kfree(buf);
2574
2575 retval = hub_port_reset(hub, port1, udev, delay);
2576 if (retval < 0) /* error or disconnect */
2577 goto fail;
2578 if (oldspeed != udev->speed) {
2579 dev_dbg(&udev->dev,
2580 "device reset changed speed!\n");
2581 retval = -ENODEV;
2582 goto fail;
2583 }
2584 if (r) {
b9cef6c3
WF
2585 dev_err(&udev->dev,
2586 "device descriptor read/64, error %d\n",
2587 r);
1da177e4
LT
2588 retval = -EMSGSIZE;
2589 continue;
2590 }
2591#undef GET_DESCRIPTOR_BUFSIZE
2592 }
2593
6c529cdc
IPG
2594 /*
2595 * If device is WUSB, we already assigned an
2596 * unauthorized address in the Connect Ack sequence;
2597 * authorization will assign the final address.
2598 */
2599 if (udev->wusb == 0) {
2600 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2601 retval = hub_set_address(udev, devnum);
2602 if (retval >= 0)
2603 break;
2604 msleep(200);
2605 }
2606 if (retval < 0) {
2607 dev_err(&udev->dev,
2608 "device not accepting address %d, error %d\n",
2609 devnum, retval);
2610 goto fail;
2611 }
2612
2613 /* cope with hardware quirkiness:
2614 * - let SET_ADDRESS settle, some device hardware wants it
2615 * - read ep0 maxpacket even for high and low speed,
2616 */
2617 msleep(10);
2618 if (USE_NEW_SCHEME(retry_counter))
1da177e4 2619 break;
6c529cdc 2620 }
1da177e4
LT
2621
2622 retval = usb_get_device_descriptor(udev, 8);
2623 if (retval < 8) {
b9cef6c3
WF
2624 dev_err(&udev->dev,
2625 "device descriptor read/8, error %d\n",
2626 retval);
1da177e4
LT
2627 if (retval >= 0)
2628 retval = -EMSGSIZE;
2629 } else {
2630 retval = 0;
2631 break;
2632 }
2633 }
2634 if (retval)
2635 goto fail;
2636
6c529cdc 2637 i = udev->descriptor.bMaxPacketSize0 == 0xff? /* wusb device? */
5bb6e0ae 2638 512 : udev->descriptor.bMaxPacketSize0;
1da177e4
LT
2639 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2640 if (udev->speed != USB_SPEED_FULL ||
2641 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2642 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2643 retval = -EMSGSIZE;
2644 goto fail;
2645 }
2646 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2647 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
fc721f51 2648 usb_ep0_reinit(udev);
1da177e4
LT
2649 }
2650
2651 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2652 if (retval < (signed)sizeof(udev->descriptor)) {
b9cef6c3
WF
2653 dev_err(&udev->dev, "device descriptor read/all, error %d\n",
2654 retval);
1da177e4
LT
2655 if (retval >= 0)
2656 retval = -ENOMSG;
2657 goto fail;
2658 }
2659
2660 retval = 0;
2661
2662fail:
4326ed0b 2663 if (retval) {
1da177e4 2664 hub_port_disable(hub, port1, 0);
4953d141 2665 update_address(udev, devnum); /* for disconnect processing */
4326ed0b 2666 }
4186ecf8 2667 mutex_unlock(&usb_address0_mutex);
1da177e4
LT
2668 return retval;
2669}
2670
2671static void
2672check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2673{
2674 struct usb_qualifier_descriptor *qual;
2675 int status;
2676
e94b1766 2677 qual = kmalloc (sizeof *qual, GFP_KERNEL);
1da177e4
LT
2678 if (qual == NULL)
2679 return;
2680
2681 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2682 qual, sizeof *qual);
2683 if (status == sizeof *qual) {
2684 dev_info(&udev->dev, "not running at top speed; "
2685 "connect to a high speed hub\n");
2686 /* hub LEDs are probably harder to miss than syslog */
2687 if (hub->has_indicators) {
2688 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
c4028958 2689 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT
2690 }
2691 }
1bc3c9e1 2692 kfree(qual);
1da177e4
LT
2693}
2694
2695static unsigned
2696hub_power_remaining (struct usb_hub *hub)
2697{
2698 struct usb_device *hdev = hub->hdev;
2699 int remaining;
55c52718 2700 int port1;
1da177e4 2701
55c52718 2702 if (!hub->limited_power)
1da177e4
LT
2703 return 0;
2704
55c52718
AS
2705 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2706 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2707 struct usb_device *udev = hdev->children[port1 - 1];
2708 int delta;
1da177e4
LT
2709
2710 if (!udev)
2711 continue;
2712
55c52718
AS
2713 /* Unconfigured devices may not use more than 100mA,
2714 * or 8mA for OTG ports */
1da177e4 2715 if (udev->actconfig)
55c52718
AS
2716 delta = udev->actconfig->desc.bMaxPower * 2;
2717 else if (port1 != udev->bus->otg_port || hdev->parent)
2718 delta = 100;
1da177e4 2719 else
55c52718
AS
2720 delta = 8;
2721 if (delta > hub->mA_per_port)
b9cef6c3
WF
2722 dev_warn(&udev->dev,
2723 "%dmA is over %umA budget for port %d!\n",
2724 delta, hub->mA_per_port, port1);
1da177e4
LT
2725 remaining -= delta;
2726 }
2727 if (remaining < 0) {
55c52718
AS
2728 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2729 - remaining);
1da177e4
LT
2730 remaining = 0;
2731 }
2732 return remaining;
2733}
2734
2735/* Handle physical or logical connection change events.
2736 * This routine is called when:
2737 * a port connection-change occurs;
2738 * a port enable-change occurs (often caused by EMI);
742120c6 2739 * usb_reset_and_verify_device() encounters changed descriptors (as from
1da177e4
LT
2740 * a firmware download)
2741 * caller already locked the hub
2742 */
2743static void hub_port_connect_change(struct usb_hub *hub, int port1,
2744 u16 portstatus, u16 portchange)
2745{
2746 struct usb_device *hdev = hub->hdev;
2747 struct device *hub_dev = hub->intfdev;
90da096e 2748 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
24618b0c
AS
2749 unsigned wHubCharacteristics =
2750 le16_to_cpu(hub->descriptor->wHubCharacteristics);
8808f00c 2751 struct usb_device *udev;
1da177e4 2752 int status, i;
24618b0c 2753
1da177e4
LT
2754 dev_dbg (hub_dev,
2755 "port %d, status %04x, change %04x, %s\n",
2756 port1, portstatus, portchange, portspeed (portstatus));
2757
2758 if (hub->has_indicators) {
2759 set_port_led(hub, port1, HUB_LED_AUTO);
2760 hub->indicator[port1-1] = INDICATOR_AUTO;
2761 }
1da177e4
LT
2762
2763#ifdef CONFIG_USB_OTG
2764 /* during HNP, don't repeat the debounce */
2765 if (hdev->bus->is_b_host)
24618b0c
AS
2766 portchange &= ~(USB_PORT_STAT_C_CONNECTION |
2767 USB_PORT_STAT_C_ENABLE);
1da177e4
LT
2768#endif
2769
8808f00c
AS
2770 /* Try to resuscitate an existing device */
2771 udev = hdev->children[port1-1];
2772 if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&
2773 udev->state != USB_STATE_NOTATTACHED) {
8808f00c
AS
2774 usb_lock_device(udev);
2775 if (portstatus & USB_PORT_STAT_ENABLE) {
2776 status = 0; /* Nothing to do */
8808f00c
AS
2777
2778#ifdef CONFIG_USB_SUSPEND
5257d97a
AS
2779 } else if (udev->state == USB_STATE_SUSPENDED &&
2780 udev->persist_enabled) {
8808f00c
AS
2781 /* For a suspended device, treat this as a
2782 * remote wakeup event.
2783 */
2784 if (udev->do_remote_wakeup)
2785 status = remote_wakeup(udev);
2786
2787 /* Otherwise leave it be; devices can't tell the
2788 * difference between suspended and disabled.
2789 */
2790 else
2791 status = 0;
2792#endif
2793
2794 } else {
5257d97a 2795 status = -ENODEV; /* Don't resuscitate */
8808f00c
AS
2796 }
2797 usb_unlock_device(udev);
2798
2799 if (status == 0) {
2800 clear_bit(port1, hub->change_bits);
2801 return;
2802 }
2803 }
2804
24618b0c 2805 /* Disconnect any existing devices under this port */
8808f00c 2806 if (udev)
24618b0c
AS
2807 usb_disconnect(&hdev->children[port1-1]);
2808 clear_bit(port1, hub->change_bits);
2809
5257d97a
AS
2810 if (portchange & (USB_PORT_STAT_C_CONNECTION |
2811 USB_PORT_STAT_C_ENABLE)) {
2812 status = hub_port_debounce(hub, port1);
2813 if (status < 0) {
2814 if (printk_ratelimit())
2815 dev_err(hub_dev, "connect-debounce failed, "
2816 "port %d disabled\n", port1);
2817 portstatus &= ~USB_PORT_STAT_CONNECTION;
2818 } else {
2819 portstatus = status;
2820 }
2821 }
2822
24618b0c 2823 /* Return now if debouncing failed or nothing is connected */
1da177e4
LT
2824 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2825
2826 /* maybe switch power back on (e.g. root hub was reset) */
74ad9bd2 2827 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
1da177e4
LT
2828 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2829 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
5257d97a 2830
1da177e4
LT
2831 if (portstatus & USB_PORT_STAT_ENABLE)
2832 goto done;
2833 return;
2834 }
2835
1da177e4 2836 for (i = 0; i < SET_CONFIG_TRIES; i++) {
1da177e4
LT
2837
2838 /* reallocate for each attempt, since references
2839 * to the previous one can escape in various ways
2840 */
2841 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2842 if (!udev) {
2843 dev_err (hub_dev,
2844 "couldn't allocate port %d usb_device\n",
2845 port1);
2846 goto done;
2847 }
2848
2849 usb_set_device_state(udev, USB_STATE_POWERED);
2850 udev->speed = USB_SPEED_UNKNOWN;
55c52718 2851 udev->bus_mA = hub->mA_per_port;
b6956ffa 2852 udev->level = hdev->level + 1;
8af548dc 2853 udev->wusb = hub_is_wusb(hub);
55c52718 2854
1da177e4
LT
2855 /* set the address */
2856 choose_address(udev);
2857 if (udev->devnum <= 0) {
2858 status = -ENOTCONN; /* Don't retry */
2859 goto loop;
2860 }
2861
2862 /* reset and get descriptor */
2863 status = hub_port_init(hub, udev, port1, i);
2864 if (status < 0)
2865 goto loop;
2866
2867 /* consecutive bus-powered hubs aren't reliable; they can
2868 * violate the voltage drop budget. if the new child has
2869 * a "powered" LED, users should notice we didn't enable it
2870 * (without reading syslog), even without per-port LEDs
2871 * on the parent.
2872 */
2873 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
55c52718 2874 && udev->bus_mA <= 100) {
1da177e4
LT
2875 u16 devstat;
2876
2877 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2878 &devstat);
55c52718 2879 if (status < 2) {
1da177e4
LT
2880 dev_dbg(&udev->dev, "get status %d ?\n", status);
2881 goto loop_disable;
2882 }
55c52718 2883 le16_to_cpus(&devstat);
1da177e4
LT
2884 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2885 dev_err(&udev->dev,
2886 "can't connect bus-powered hub "
2887 "to this port\n");
2888 if (hub->has_indicators) {
2889 hub->indicator[port1-1] =
2890 INDICATOR_AMBER_BLINK;
c4028958 2891 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT
2892 }
2893 status = -ENOTCONN; /* Don't retry */
2894 goto loop_disable;
2895 }
2896 }
2897
2898 /* check for devices running slower than they could */
2899 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2900 && udev->speed == USB_SPEED_FULL
2901 && highspeed_hubs != 0)
2902 check_highspeed (hub, udev, port1);
2903
2904 /* Store the parent's children[] pointer. At this point
2905 * udev becomes globally accessible, although presumably
2906 * no one will look at it until hdev is unlocked.
2907 */
1da177e4
LT
2908 status = 0;
2909
2910 /* We mustn't add new devices if the parent hub has
2911 * been disconnected; we would race with the
2912 * recursively_mark_NOTATTACHED() routine.
2913 */
2914 spin_lock_irq(&device_state_lock);
2915 if (hdev->state == USB_STATE_NOTATTACHED)
2916 status = -ENOTCONN;
2917 else
2918 hdev->children[port1-1] = udev;
2919 spin_unlock_irq(&device_state_lock);
2920
2921 /* Run it through the hoops (find a driver, etc) */
2922 if (!status) {
2923 status = usb_new_device(udev);
2924 if (status) {
2925 spin_lock_irq(&device_state_lock);
2926 hdev->children[port1-1] = NULL;
2927 spin_unlock_irq(&device_state_lock);
2928 }
2929 }
2930
1da177e4
LT
2931 if (status)
2932 goto loop_disable;
2933
2934 status = hub_power_remaining(hub);
2935 if (status)
55c52718 2936 dev_dbg(hub_dev, "%dmA power budget left\n", status);
1da177e4
LT
2937
2938 return;
2939
2940loop_disable:
2941 hub_port_disable(hub, port1, 1);
2942loop:
fc721f51 2943 usb_ep0_reinit(udev);
1da177e4
LT
2944 release_address(udev);
2945 usb_put_dev(udev);
ffcdc18d 2946 if ((status == -ENOTCONN) || (status == -ENOTSUPP))
1da177e4
LT
2947 break;
2948 }
3a31155c
AS
2949 if (hub->hdev->parent ||
2950 !hcd->driver->port_handed_over ||
2951 !(hcd->driver->port_handed_over)(hcd, port1))
2952 dev_err(hub_dev, "unable to enumerate USB device on port %d\n",
2953 port1);
1da177e4
LT
2954
2955done:
2956 hub_port_disable(hub, port1, 1);
90da096e
BR
2957 if (hcd->driver->relinquish_port && !hub->hdev->parent)
2958 hcd->driver->relinquish_port(hcd, port1);
1da177e4
LT
2959}
2960
2961static void hub_events(void)
2962{
2963 struct list_head *tmp;
2964 struct usb_device *hdev;
2965 struct usb_interface *intf;
2966 struct usb_hub *hub;
2967 struct device *hub_dev;
2968 u16 hubstatus;
2969 u16 hubchange;
2970 u16 portstatus;
2971 u16 portchange;
2972 int i, ret;
2973 int connect_change;
2974
2975 /*
2976 * We restart the list every time to avoid a deadlock with
2977 * deleting hubs downstream from this one. This should be
2978 * safe since we delete the hub from the event list.
2979 * Not the most efficient, but avoids deadlocks.
2980 */
2981 while (1) {
2982
2983 /* Grab the first entry at the beginning of the list */
2984 spin_lock_irq(&hub_event_lock);
2985 if (list_empty(&hub_event_list)) {
2986 spin_unlock_irq(&hub_event_lock);
2987 break;
2988 }
2989
2990 tmp = hub_event_list.next;
2991 list_del_init(tmp);
2992
2993 hub = list_entry(tmp, struct usb_hub, event_list);
e8054854
AS
2994 kref_get(&hub->kref);
2995 spin_unlock_irq(&hub_event_lock);
1da177e4 2996
e8054854
AS
2997 hdev = hub->hdev;
2998 hub_dev = hub->intfdev;
2999 intf = to_usb_interface(hub_dev);
40f122f3 3000 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
1da177e4
LT
3001 hdev->state, hub->descriptor
3002 ? hub->descriptor->bNbrPorts
3003 : 0,
3004 /* NOTE: expects max 15 ports... */
3005 (u16) hub->change_bits[0],
40f122f3 3006 (u16) hub->event_bits[0]);
1da177e4 3007
1da177e4
LT
3008 /* Lock the device, then check to see if we were
3009 * disconnected while waiting for the lock to succeed. */
06b84e8a 3010 usb_lock_device(hdev);
e8054854 3011 if (unlikely(hub->disconnected))
1da177e4
LT
3012 goto loop;
3013
3014 /* If the hub has died, clean up after it */
3015 if (hdev->state == USB_STATE_NOTATTACHED) {
7de18d8b 3016 hub->error = -ENODEV;
4330354f 3017 hub_quiesce(hub, HUB_DISCONNECT);
1da177e4
LT
3018 goto loop;
3019 }
3020
40f122f3
AS
3021 /* Autoresume */
3022 ret = usb_autopm_get_interface(intf);
3023 if (ret) {
3024 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
3025 goto loop;
3026 }
a8e7c565 3027
40f122f3 3028 /* If this is an inactive hub, do nothing */
1da177e4 3029 if (hub->quiescing)
40f122f3 3030 goto loop_autopm;
1da177e4
LT
3031
3032 if (hub->error) {
3033 dev_dbg (hub_dev, "resetting for error %d\n",
3034 hub->error);
3035
742120c6 3036 ret = usb_reset_device(hdev);
1da177e4
LT
3037 if (ret) {
3038 dev_dbg (hub_dev,
3039 "error resetting hub: %d\n", ret);
40f122f3 3040 goto loop_autopm;
1da177e4
LT
3041 }
3042
3043 hub->nerrors = 0;
3044 hub->error = 0;
3045 }
3046
3047 /* deal with port status changes */
3048 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
3049 if (test_bit(i, hub->busy_bits))
3050 continue;
3051 connect_change = test_bit(i, hub->change_bits);
3052 if (!test_and_clear_bit(i, hub->event_bits) &&
6ee0b270 3053 !connect_change)
1da177e4
LT
3054 continue;
3055
3056 ret = hub_port_status(hub, i,
3057 &portstatus, &portchange);
3058 if (ret < 0)
3059 continue;
3060
1da177e4
LT
3061 if (portchange & USB_PORT_STAT_C_CONNECTION) {
3062 clear_port_feature(hdev, i,
3063 USB_PORT_FEAT_C_CONNECTION);
3064 connect_change = 1;
3065 }
3066
3067 if (portchange & USB_PORT_STAT_C_ENABLE) {
3068 if (!connect_change)
3069 dev_dbg (hub_dev,
3070 "port %d enable change, "
3071 "status %08x\n",
3072 i, portstatus);
3073 clear_port_feature(hdev, i,
3074 USB_PORT_FEAT_C_ENABLE);
3075
3076 /*
3077 * EM interference sometimes causes badly
3078 * shielded USB devices to be shutdown by
3079 * the hub, this hack enables them again.
3080 * Works at least with mouse driver.
3081 */
3082 if (!(portstatus & USB_PORT_STAT_ENABLE)
3083 && !connect_change
3084 && hdev->children[i-1]) {
3085 dev_err (hub_dev,
3086 "port %i "
3087 "disabled by hub (EMI?), "
3088 "re-enabling...\n",
3089 i);
3090 connect_change = 1;
3091 }
3092 }
3093
3094 if (portchange & USB_PORT_STAT_C_SUSPEND) {
8808f00c
AS
3095 struct usb_device *udev;
3096
1da177e4
LT
3097 clear_port_feature(hdev, i,
3098 USB_PORT_FEAT_C_SUSPEND);
8808f00c
AS
3099 udev = hdev->children[i-1];
3100 if (udev) {
3101 usb_lock_device(udev);
1da177e4
LT
3102 ret = remote_wakeup(hdev->
3103 children[i-1]);
8808f00c 3104 usb_unlock_device(udev);
1da177e4
LT
3105 if (ret < 0)
3106 connect_change = 1;
3107 } else {
3108 ret = -ENODEV;
3109 hub_port_disable(hub, i, 1);
3110 }
3111 dev_dbg (hub_dev,
3112 "resume on port %d, status %d\n",
3113 i, ret);
3114 }
3115
3116 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
3117 dev_err (hub_dev,
3118 "over-current change on port %d\n",
3119 i);
3120 clear_port_feature(hdev, i,
3121 USB_PORT_FEAT_C_OVER_CURRENT);
8520f380 3122 hub_power_on(hub, true);
1da177e4
LT
3123 }
3124
3125 if (portchange & USB_PORT_STAT_C_RESET) {
3126 dev_dbg (hub_dev,
3127 "reset change on port %d\n",
3128 i);
3129 clear_port_feature(hdev, i,
3130 USB_PORT_FEAT_C_RESET);
3131 }
3132
3133 if (connect_change)
3134 hub_port_connect_change(hub, i,
3135 portstatus, portchange);
3136 } /* end for i */
3137
3138 /* deal with hub status changes */
3139 if (test_and_clear_bit(0, hub->event_bits) == 0)
3140 ; /* do nothing */
3141 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
3142 dev_err (hub_dev, "get_hub_status failed\n");
3143 else {
3144 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
3145 dev_dbg (hub_dev, "power change\n");
3146 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
55c52718
AS
3147 if (hubstatus & HUB_STATUS_LOCAL_POWER)
3148 /* FIXME: Is this always true? */
55c52718 3149 hub->limited_power = 1;
403fae78 3150 else
3151 hub->limited_power = 0;
1da177e4
LT
3152 }
3153 if (hubchange & HUB_CHANGE_OVERCURRENT) {
3154 dev_dbg (hub_dev, "overcurrent change\n");
3155 msleep(500); /* Cool down */
3156 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
8520f380 3157 hub_power_on(hub, true);
1da177e4
LT
3158 }
3159 }
3160
40f122f3
AS
3161loop_autopm:
3162 /* Allow autosuspend if we're not going to run again */
3163 if (list_empty(&hub->event_list))
3164 usb_autopm_enable(intf);
1da177e4
LT
3165loop:
3166 usb_unlock_device(hdev);
e8054854 3167 kref_put(&hub->kref, hub_release);
1da177e4
LT
3168
3169 } /* end while (1) */
3170}
3171
3172static int hub_thread(void *__unused)
3173{
3bb1af52
AS
3174 /* khubd needs to be freezable to avoid intefering with USB-PERSIST
3175 * port handover. Otherwise it might see that a full-speed device
3176 * was gone before the EHCI controller had handed its port over to
3177 * the companion full-speed controller.
3178 */
83144186 3179 set_freezable();
3bb1af52 3180
1da177e4
LT
3181 do {
3182 hub_events();
e42837bc 3183 wait_event_freezable(khubd_wait,
9c8d6178 3184 !list_empty(&hub_event_list) ||
3185 kthread_should_stop());
9c8d6178 3186 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
1da177e4 3187
9c8d6178 3188 pr_debug("%s: khubd exiting\n", usbcore_name);
3189 return 0;
1da177e4
LT
3190}
3191
3192static struct usb_device_id hub_id_table [] = {
3193 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
3194 .bDeviceClass = USB_CLASS_HUB},
3195 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
3196 .bInterfaceClass = USB_CLASS_HUB},
3197 { } /* Terminating entry */
3198};
3199
3200MODULE_DEVICE_TABLE (usb, hub_id_table);
3201
3202static struct usb_driver hub_driver = {
1da177e4
LT
3203 .name = "hub",
3204 .probe = hub_probe,
3205 .disconnect = hub_disconnect,
3206 .suspend = hub_suspend,
3207 .resume = hub_resume,
f07600cf 3208 .reset_resume = hub_reset_resume,
7de18d8b
AS
3209 .pre_reset = hub_pre_reset,
3210 .post_reset = hub_post_reset,
1da177e4
LT
3211 .ioctl = hub_ioctl,
3212 .id_table = hub_id_table,
40f122f3 3213 .supports_autosuspend = 1,
1da177e4
LT
3214};
3215
3216int usb_hub_init(void)
3217{
1da177e4
LT
3218 if (usb_register(&hub_driver) < 0) {
3219 printk(KERN_ERR "%s: can't register hub driver\n",
3220 usbcore_name);
3221 return -1;
3222 }
3223
9c8d6178 3224 khubd_task = kthread_run(hub_thread, NULL, "khubd");
3225 if (!IS_ERR(khubd_task))
1da177e4 3226 return 0;
1da177e4
LT
3227
3228 /* Fall through if kernel_thread failed */
3229 usb_deregister(&hub_driver);
3230 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
3231
3232 return -1;
3233}
3234
3235void usb_hub_cleanup(void)
3236{
9c8d6178 3237 kthread_stop(khubd_task);
1da177e4
LT
3238
3239 /*
3240 * Hub resources are freed for us by usb_deregister. It calls
3241 * usb_driver_purge on every device which in turn calls that
3242 * devices disconnect function if it is using this driver.
3243 * The hub_disconnect function takes care of releasing the
3244 * individual hub resources. -greg
3245 */
3246 usb_deregister(&hub_driver);
3247} /* usb_hub_cleanup() */
3248
eb764c4b
AS
3249static int descriptors_changed(struct usb_device *udev,
3250 struct usb_device_descriptor *old_device_descriptor)
3251{
3252 int changed = 0;
3253 unsigned index;
3254 unsigned serial_len = 0;
3255 unsigned len;
3256 unsigned old_length;
3257 int length;
3258 char *buf;
3259
3260 if (memcmp(&udev->descriptor, old_device_descriptor,
3261 sizeof(*old_device_descriptor)) != 0)
3262 return 1;
3263
3264 /* Since the idVendor, idProduct, and bcdDevice values in the
3265 * device descriptor haven't changed, we will assume the
3266 * Manufacturer and Product strings haven't changed either.
3267 * But the SerialNumber string could be different (e.g., a
3268 * different flash card of the same brand).
3269 */
3270 if (udev->serial)
3271 serial_len = strlen(udev->serial) + 1;
1da177e4 3272
eb764c4b 3273 len = serial_len;
1da177e4 3274 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
eb764c4b
AS
3275 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
3276 len = max(len, old_length);
1da177e4 3277 }
eb764c4b 3278
0cc1a51f 3279 buf = kmalloc(len, GFP_NOIO);
1da177e4
LT
3280 if (buf == NULL) {
3281 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
3282 /* assume the worst */
3283 return 1;
3284 }
3285 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
eb764c4b 3286 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
1da177e4
LT
3287 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
3288 old_length);
eb764c4b 3289 if (length != old_length) {
1da177e4
LT
3290 dev_dbg(&udev->dev, "config index %d, error %d\n",
3291 index, length);
eb764c4b 3292 changed = 1;
1da177e4
LT
3293 break;
3294 }
3295 if (memcmp (buf, udev->rawdescriptors[index], old_length)
3296 != 0) {
3297 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
eb764c4b
AS
3298 index,
3299 ((struct usb_config_descriptor *) buf)->
3300 bConfigurationValue);
3301 changed = 1;
1da177e4
LT
3302 break;
3303 }
3304 }
eb764c4b
AS
3305
3306 if (!changed && serial_len) {
3307 length = usb_string(udev, udev->descriptor.iSerialNumber,
3308 buf, serial_len);
3309 if (length + 1 != serial_len) {
3310 dev_dbg(&udev->dev, "serial string error %d\n",
3311 length);
3312 changed = 1;
3313 } else if (memcmp(buf, udev->serial, length) != 0) {
3314 dev_dbg(&udev->dev, "serial string changed\n");
3315 changed = 1;
3316 }
3317 }
3318
1da177e4 3319 kfree(buf);
eb764c4b 3320 return changed;
1da177e4
LT
3321}
3322
3323/**
742120c6 3324 * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
1da177e4
LT
3325 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3326 *
79efa097
AS
3327 * WARNING - don't use this routine to reset a composite device
3328 * (one with multiple interfaces owned by separate drivers)!
742120c6 3329 * Use usb_reset_device() instead.
1da177e4
LT
3330 *
3331 * Do a port reset, reassign the device's address, and establish its
3332 * former operating configuration. If the reset fails, or the device's
3333 * descriptors change from their values before the reset, or the original
3334 * configuration and altsettings cannot be restored, a flag will be set
3335 * telling khubd to pretend the device has been disconnected and then
3336 * re-connected. All drivers will be unbound, and the device will be
3337 * re-enumerated and probed all over again.
3338 *
3339 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3340 * flagged for logical disconnection, or some other negative error code
3341 * if the reset wasn't even attempted.
3342 *
3343 * The caller must own the device lock. For example, it's safe to use
3344 * this from a driver probe() routine after downloading new firmware.
3345 * For calls that might not occur during probe(), drivers should lock
3346 * the device using usb_lock_device_for_reset().
6bc6cff5
AS
3347 *
3348 * Locking exception: This routine may also be called from within an
3349 * autoresume handler. Such usage won't conflict with other tasks
3350 * holding the device lock because these tasks should always call
3351 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
1da177e4 3352 */
742120c6 3353static int usb_reset_and_verify_device(struct usb_device *udev)
1da177e4
LT
3354{
3355 struct usb_device *parent_hdev = udev->parent;
3356 struct usb_hub *parent_hub;
3357 struct usb_device_descriptor descriptor = udev->descriptor;
12c3da34
AS
3358 int i, ret = 0;
3359 int port1 = udev->portnum;
1da177e4
LT
3360
3361 if (udev->state == USB_STATE_NOTATTACHED ||
3362 udev->state == USB_STATE_SUSPENDED) {
3363 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3364 udev->state);
3365 return -EINVAL;
3366 }
3367
3368 if (!parent_hdev) {
3369 /* this requires hcd-specific logic; see OHCI hc_restart() */
441b62c1 3370 dev_dbg(&udev->dev, "%s for root hub!\n", __func__);
1da177e4
LT
3371 return -EISDIR;
3372 }
1da177e4
LT
3373 parent_hub = hdev_to_hub(parent_hdev);
3374
1da177e4
LT
3375 set_bit(port1, parent_hub->busy_bits);
3376 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
3377
3378 /* ep0 maxpacket size may change; let the HCD know about it.
3379 * Other endpoints will be handled by re-enumeration. */
fc721f51 3380 usb_ep0_reinit(udev);
1da177e4 3381 ret = hub_port_init(parent_hub, udev, port1, i);
dd4dd19e 3382 if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
1da177e4
LT
3383 break;
3384 }
3385 clear_bit(port1, parent_hub->busy_bits);
d5cbad4b 3386
1da177e4
LT
3387 if (ret < 0)
3388 goto re_enumerate;
3389
3390 /* Device might have changed firmware (DFU or similar) */
eb764c4b 3391 if (descriptors_changed(udev, &descriptor)) {
1da177e4
LT
3392 dev_info(&udev->dev, "device firmware changed\n");
3393 udev->descriptor = descriptor; /* for disconnect() calls */
3394 goto re_enumerate;
3395 }
3396
3397 if (!udev->actconfig)
3398 goto done;
3399
3400 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3401 USB_REQ_SET_CONFIGURATION, 0,
3402 udev->actconfig->desc.bConfigurationValue, 0,
3403 NULL, 0, USB_CTRL_SET_TIMEOUT);
3404 if (ret < 0) {
3405 dev_err(&udev->dev,
3406 "can't restore configuration #%d (error=%d)\n",
3407 udev->actconfig->desc.bConfigurationValue, ret);
3408 goto re_enumerate;
3409 }
3410 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3411
3412 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3413 struct usb_interface *intf = udev->actconfig->interface[i];
3414 struct usb_interface_descriptor *desc;
3415
3416 /* set_interface resets host side toggle even
3417 * for altsetting zero. the interface may have no driver.
3418 */
3419 desc = &intf->cur_altsetting->desc;
3420 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3421 desc->bAlternateSetting);
3422 if (ret < 0) {
3423 dev_err(&udev->dev, "failed to restore interface %d "
3424 "altsetting %d (error=%d)\n",
3425 desc->bInterfaceNumber,
3426 desc->bAlternateSetting,
3427 ret);
3428 goto re_enumerate;
3429 }
3430 }
3431
3432done:
1da177e4
LT
3433 return 0;
3434
3435re_enumerate:
3436 hub_port_logical_disconnect(parent_hub, port1);
3437 return -ENODEV;
3438}
79efa097
AS
3439
3440/**
742120c6 3441 * usb_reset_device - warn interface drivers and perform a USB port reset
79efa097 3442 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
79efa097
AS
3443 *
3444 * Warns all drivers bound to registered interfaces (using their pre_reset
3445 * method), performs the port reset, and then lets the drivers know that
3446 * the reset is over (using their post_reset method).
3447 *
742120c6 3448 * Return value is the same as for usb_reset_and_verify_device().
79efa097
AS
3449 *
3450 * The caller must own the device lock. For example, it's safe to use
3451 * this from a driver probe() routine after downloading new firmware.
3452 * For calls that might not occur during probe(), drivers should lock
3453 * the device using usb_lock_device_for_reset().
78d9a487
AS
3454 *
3455 * If an interface is currently being probed or disconnected, we assume
3456 * its driver knows how to handle resets. For all other interfaces,
3457 * if the driver doesn't have pre_reset and post_reset methods then
3458 * we attempt to unbind it and rebind afterward.
79efa097 3459 */
742120c6 3460int usb_reset_device(struct usb_device *udev)
79efa097
AS
3461{
3462 int ret;
852c4b43 3463 int i;
79efa097
AS
3464 struct usb_host_config *config = udev->actconfig;
3465
3466 if (udev->state == USB_STATE_NOTATTACHED ||
3467 udev->state == USB_STATE_SUSPENDED) {
3468 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3469 udev->state);
3470 return -EINVAL;
3471 }
3472
645daaab 3473 /* Prevent autosuspend during the reset */
94fcda1f 3474 usb_autoresume_device(udev);
645daaab 3475
79efa097 3476 if (config) {
79efa097 3477 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
852c4b43
AS
3478 struct usb_interface *cintf = config->interface[i];
3479 struct usb_driver *drv;
78d9a487 3480 int unbind = 0;
852c4b43
AS
3481
3482 if (cintf->dev.driver) {
79efa097 3483 drv = to_usb_driver(cintf->dev.driver);
78d9a487
AS
3484 if (drv->pre_reset && drv->post_reset)
3485 unbind = (drv->pre_reset)(cintf);
3486 else if (cintf->condition ==
3487 USB_INTERFACE_BOUND)
3488 unbind = 1;
3489 if (unbind)
3490 usb_forced_unbind_intf(cintf);
79efa097
AS
3491 }
3492 }
3493 }
3494
742120c6 3495 ret = usb_reset_and_verify_device(udev);
79efa097
AS
3496
3497 if (config) {
79efa097 3498 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
852c4b43
AS
3499 struct usb_interface *cintf = config->interface[i];
3500 struct usb_driver *drv;
78d9a487 3501 int rebind = cintf->needs_binding;
852c4b43 3502
78d9a487 3503 if (!rebind && cintf->dev.driver) {
79efa097
AS
3504 drv = to_usb_driver(cintf->dev.driver);
3505 if (drv->post_reset)
78d9a487
AS
3506 rebind = (drv->post_reset)(cintf);
3507 else if (cintf->condition ==
3508 USB_INTERFACE_BOUND)
3509 rebind = 1;
79efa097 3510 }
6c640945 3511 if (ret == 0 && rebind)
78d9a487 3512 usb_rebind_intf(cintf);
79efa097
AS
3513 }
3514 }
3515
94fcda1f 3516 usb_autosuspend_device(udev);
79efa097
AS
3517 return ret;
3518}
742120c6 3519EXPORT_SYMBOL_GPL(usb_reset_device);
dc023dce
IPG
3520
3521
3522/**
3523 * usb_queue_reset_device - Reset a USB device from an atomic context
3524 * @iface: USB interface belonging to the device to reset
3525 *
3526 * This function can be used to reset a USB device from an atomic
3527 * context, where usb_reset_device() won't work (as it blocks).
3528 *
3529 * Doing a reset via this method is functionally equivalent to calling
3530 * usb_reset_device(), except for the fact that it is delayed to a
3531 * workqueue. This means that any drivers bound to other interfaces
3532 * might be unbound, as well as users from usbfs in user space.
3533 *
3534 * Corner cases:
3535 *
3536 * - Scheduling two resets at the same time from two different drivers
3537 * attached to two different interfaces of the same device is
3538 * possible; depending on how the driver attached to each interface
3539 * handles ->pre_reset(), the second reset might happen or not.
3540 *
3541 * - If a driver is unbound and it had a pending reset, the reset will
3542 * be cancelled.
3543 *
3544 * - This function can be called during .probe() or .disconnect()
3545 * times. On return from .disconnect(), any pending resets will be
3546 * cancelled.
3547 *
3548 * There is no no need to lock/unlock the @reset_ws as schedule_work()
3549 * does its own.
3550 *
3551 * NOTE: We don't do any reference count tracking because it is not
3552 * needed. The lifecycle of the work_struct is tied to the
3553 * usb_interface. Before destroying the interface we cancel the
3554 * work_struct, so the fact that work_struct is queued and or
3555 * running means the interface (and thus, the device) exist and
3556 * are referenced.
3557 */
3558void usb_queue_reset_device(struct usb_interface *iface)
3559{
3560 schedule_work(&iface->reset_ws);
3561}
3562EXPORT_SYMBOL_GPL(usb_queue_reset_device);