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fs: introduce some page/buffer invariants
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / core / hub.c
CommitLineData
1da177e4
LT		 1/*
2 * USB hub driver.
3 *
4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
8 *
9 */
10
1da177e4
LT		 11#include <linux/kernel.h>
12#include <linux/errno.h>
13#include <linux/module.h>
14#include <linux/moduleparam.h>
15#include <linux/completion.h>
16#include <linux/sched.h>
17#include <linux/list.h>
18#include <linux/slab.h>
1da177e4
LT		 19#include <linux/ioctl.h>
20#include <linux/usb.h>
21#include <linux/usbdevice_fs.h>
9c8d6178 22#include <linux/kthread.h>
4186ecf8 23#include <linux/mutex.h>
7dfb7103 24#include <linux/freezer.h>
1da177e4
LT		 25
26#include <asm/semaphore.h>
27#include <asm/uaccess.h>
28#include <asm/byteorder.h>
29
30#include "usb.h"
31#include "hcd.h"
32#include "hub.h"
33
54515fe5
AS		 34#ifdef CONFIG_USB_PERSIST
35#define USB_PERSIST 1
36#else
37#define USB_PERSIST 0
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;
75 unsigned activating:1;
e8054854 76 unsigned disconnected:1;
1bb5f66b
AS		 77
78 unsigned has_indicators:1;
79 u8 indicator[USB_MAXCHILDREN];
6d5aefb8 80 struct delayed_work leds;
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
103/*
104 * As of 2.6.10 we introduce a new USB device initialization scheme which
105 * closely resembles the way Windows works. Hopefully it will be compatible
106 * with a wider range of devices than the old scheme. However some previously
107 * working devices may start giving rise to "device not accepting address"
108 * errors; if that happens the user can try the old scheme by adjusting the
109 * following module parameters.
110 *
111 * For maximum flexibility there are two boolean parameters to control the
112 * hub driver's behavior. On the first initialization attempt, if the
113 * "old_scheme_first" parameter is set then the old scheme will be used,
114 * otherwise the new scheme is used. If that fails and "use_both_schemes"
115 * is set, then the driver will make another attempt, using the other scheme.
116 */
117static int old_scheme_first = 0;
118module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
119MODULE_PARM_DESC(old_scheme_first,
120 "start with the old device initialization scheme");
121
122static int use_both_schemes = 1;
123module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
124MODULE_PARM_DESC(use_both_schemes,
125 "try the other device initialization scheme if the "
126 "first one fails");
127
128
404d5b18 129static inline char *portspeed(int portstatus)
1da177e4
LT		 130{
131 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
132 return "480 Mb/s";
133 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
134 return "1.5 Mb/s";
135 else
136 return "12 Mb/s";
137}
1da177e4
LT		 138
139/* Note that hdev or one of its children must be locked! */
140static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
141{
142 return usb_get_intfdata(hdev->actconfig->interface[0]);
143}
144
145/* USB 2.0 spec Section 11.24.4.5 */
146static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
147{
148 int i, ret;
149
150 for (i = 0; i < 3; i++) {
151 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
152 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
153 USB_DT_HUB << 8, 0, data, size,
154 USB_CTRL_GET_TIMEOUT);
155 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
156 return ret;
157 }
158 return -EINVAL;
159}
160
161/*
162 * USB 2.0 spec Section 11.24.2.1
163 */
164static int clear_hub_feature(struct usb_device *hdev, int feature)
165{
166 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
167 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
168}
169
170/*
171 * USB 2.0 spec Section 11.24.2.2
172 */
173static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
174{
175 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
176 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
177 NULL, 0, 1000);
178}
179
180/*
181 * USB 2.0 spec Section 11.24.2.13
182 */
183static int set_port_feature(struct usb_device *hdev, int port1, int feature)
184{
185 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
186 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
187 NULL, 0, 1000);
188}
189
190/*
191 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
192 * for info about using port indicators
193 */
194static void set_port_led(
195 struct usb_hub *hub,
196 int port1,
197 int selector
198)
199{
200 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
201 USB_PORT_FEAT_INDICATOR);
202 if (status < 0)
203 dev_dbg (hub->intfdev,
204 "port %d indicator %s status %d\n",
205 port1,
206 ({ char *s; switch (selector) {
207 case HUB_LED_AMBER: s = "amber"; break;
208 case HUB_LED_GREEN: s = "green"; break;
209 case HUB_LED_OFF: s = "off"; break;
210 case HUB_LED_AUTO: s = "auto"; break;
211 default: s = "??"; break;
212 }; s; }),
213 status);
214}
215
216#define LED_CYCLE_PERIOD ((2*HZ)/3)
217
c4028958 218static void led_work (struct work_struct *work)
1da177e4 219{
c4028958
DH		 220 struct usb_hub *hub =
221 container_of(work, struct usb_hub, leds.work);
1da177e4
LT		 222 struct usb_device *hdev = hub->hdev;
223 unsigned i;
224 unsigned changed = 0;
225 int cursor = -1;
226
227 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
228 return;
229
230 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
231 unsigned selector, mode;
232
233 /* 30%-50% duty cycle */
234
235 switch (hub->indicator[i]) {
236 /* cycle marker */
237 case INDICATOR_CYCLE:
238 cursor = i;
239 selector = HUB_LED_AUTO;
240 mode = INDICATOR_AUTO;
241 break;
242 /* blinking green = sw attention */
243 case INDICATOR_GREEN_BLINK:
244 selector = HUB_LED_GREEN;
245 mode = INDICATOR_GREEN_BLINK_OFF;
246 break;
247 case INDICATOR_GREEN_BLINK_OFF:
248 selector = HUB_LED_OFF;
249 mode = INDICATOR_GREEN_BLINK;
250 break;
251 /* blinking amber = hw attention */
252 case INDICATOR_AMBER_BLINK:
253 selector = HUB_LED_AMBER;
254 mode = INDICATOR_AMBER_BLINK_OFF;
255 break;
256 case INDICATOR_AMBER_BLINK_OFF:
257 selector = HUB_LED_OFF;
258 mode = INDICATOR_AMBER_BLINK;
259 break;
260 /* blink green/amber = reserved */
261 case INDICATOR_ALT_BLINK:
262 selector = HUB_LED_GREEN;
263 mode = INDICATOR_ALT_BLINK_OFF;
264 break;
265 case INDICATOR_ALT_BLINK_OFF:
266 selector = HUB_LED_AMBER;
267 mode = INDICATOR_ALT_BLINK;
268 break;
269 default:
270 continue;
271 }
272 if (selector != HUB_LED_AUTO)
273 changed = 1;
274 set_port_led(hub, i + 1, selector);
275 hub->indicator[i] = mode;
276 }
277 if (!changed && blinkenlights) {
278 cursor++;
279 cursor %= hub->descriptor->bNbrPorts;
280 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
281 hub->indicator[cursor] = INDICATOR_CYCLE;
282 changed++;
283 }
284 if (changed)
285 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
286}
287
288/* use a short timeout for hub/port status fetches */
289#define USB_STS_TIMEOUT 1000
290#define USB_STS_RETRIES 5
291
292/*
293 * USB 2.0 spec Section 11.24.2.6
294 */
295static int get_hub_status(struct usb_device *hdev,
296 struct usb_hub_status *data)
297{
298 int i, status = -ETIMEDOUT;
299
300 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
301 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
302 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
303 data, sizeof(*data), USB_STS_TIMEOUT);
304 }
305 return status;
306}
307
308/*
309 * USB 2.0 spec Section 11.24.2.7
310 */
311static int get_port_status(struct usb_device *hdev, int port1,
312 struct usb_port_status *data)
313{
314 int i, status = -ETIMEDOUT;
315
316 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
317 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
318 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
319 data, sizeof(*data), USB_STS_TIMEOUT);
320 }
321 return status;
322}
323
324static void kick_khubd(struct usb_hub *hub)
325{
326 unsigned long flags;
327
40f122f3
AS		 328 /* Suppress autosuspend until khubd runs */
329 to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
330
1da177e4 331 spin_lock_irqsave(&hub_event_lock, flags);
e8054854 332 if (!hub->disconnected & list_empty(&hub->event_list)) {
1da177e4
LT		 333 list_add_tail(&hub->event_list, &hub_event_list);
334 wake_up(&khubd_wait);
335 }
336 spin_unlock_irqrestore(&hub_event_lock, flags);
337}
338
339void usb_kick_khubd(struct usb_device *hdev)
340{
e8054854 341 /* FIXME: What if hdev isn't bound to the hub driver? */
1da177e4
LT		 342 kick_khubd(hdev_to_hub(hdev));
343}
344
345
346/* completion function, fires on port status changes and various faults */
7d12e780 347static void hub_irq(struct urb *urb)
1da177e4 348{
ec17cf1c 349 struct usb_hub *hub = urb->context;
1da177e4
LT		 350 int status;
351 int i;
352 unsigned long bits;
353
354 switch (urb->status) {
355 case -ENOENT: /* synchronous unlink */
356 case -ECONNRESET: /* async unlink */
357 case -ESHUTDOWN: /* hardware going away */
358 return;
359
360 default: /* presumably an error */
361 /* Cause a hub reset after 10 consecutive errors */
362 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
363 if ((++hub->nerrors < 10) || hub->error)
364 goto resubmit;
365 hub->error = urb->status;
366 /* FALL THROUGH */
ec17cf1c 367
1da177e4
LT		 368 /* let khubd handle things */
369 case 0: /* we got data: port status changed */
370 bits = 0;
371 for (i = 0; i < urb->actual_length; ++i)
372 bits |= ((unsigned long) ((*hub->buffer)[i]))
373 << (i*8);
374 hub->event_bits[0] = bits;
375 break;
376 }
377
378 hub->nerrors = 0;
379
380 /* Something happened, let khubd figure it out */
381 kick_khubd(hub);
382
383resubmit:
384 if (hub->quiescing)
385 return;
386
387 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
388 && status != -ENODEV && status != -EPERM)
389 dev_err (hub->intfdev, "resubmit --> %d\n", status);
390}
391
392/* USB 2.0 spec Section 11.24.2.3 */
393static inline int
394hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
395{
396 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
397 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
398 tt, NULL, 0, 1000);
399}
400
401/*
402 * enumeration blocks khubd for a long time. we use keventd instead, since
403 * long blocking there is the exception, not the rule. accordingly, HCDs
404 * talking to TTs must queue control transfers (not just bulk and iso), so
405 * both can talk to the same hub concurrently.
406 */
c4028958 407static void hub_tt_kevent (struct work_struct *work)
1da177e4 408{
c4028958
DH		 409 struct usb_hub *hub =
410 container_of(work, struct usb_hub, tt.kevent);
1da177e4 411 unsigned long flags;
55e5fdfa 412 int limit = 100;
1da177e4
LT		 413
414 spin_lock_irqsave (&hub->tt.lock, flags);
55e5fdfa 415 while (--limit && !list_empty (&hub->tt.clear_list)) {
1da177e4
LT		 416 struct list_head *temp;
417 struct usb_tt_clear *clear;
418 struct usb_device *hdev = hub->hdev;
419 int status;
420
421 temp = hub->tt.clear_list.next;
422 clear = list_entry (temp, struct usb_tt_clear, clear_list);
423 list_del (&clear->clear_list);
424
425 /* drop lock so HCD can concurrently report other TT errors */
426 spin_unlock_irqrestore (&hub->tt.lock, flags);
427 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
428 spin_lock_irqsave (&hub->tt.lock, flags);
429
430 if (status)
431 dev_err (&hdev->dev,
432 "clear tt %d (%04x) error %d\n",
433 clear->tt, clear->devinfo, status);
1bc3c9e1 434 kfree(clear);
1da177e4
LT		 435 }
436 spin_unlock_irqrestore (&hub->tt.lock, flags);
437}
438
439/**
440 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
441 * @udev: the device whose split transaction failed
442 * @pipe: identifies the endpoint of the failed transaction
443 *
444 * High speed HCDs use this to tell the hub driver that some split control or
445 * bulk transaction failed in a way that requires clearing internal state of
446 * a transaction translator. This is normally detected (and reported) from
447 * interrupt context.
448 *
449 * It may not be possible for that hub to handle additional full (or low)
450 * speed transactions until that state is fully cleared out.
451 */
452void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
453{
454 struct usb_tt *tt = udev->tt;
455 unsigned long flags;
456 struct usb_tt_clear *clear;
457
458 /* we've got to cope with an arbitrary number of pending TT clears,
459 * since each TT has "at least two" buffers that can need it (and
460 * there can be many TTs per hub). even if they're uncommon.
461 */
54e6ecb2 462 if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
1da177e4
LT		 463 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
464 /* FIXME recover somehow ... RESET_TT? */
465 return;
466 }
467
468 /* info that CLEAR_TT_BUFFER needs */
469 clear->tt = tt->multi ? udev->ttport : 1;
470 clear->devinfo = usb_pipeendpoint (pipe);
471 clear->devinfo |= udev->devnum << 4;
472 clear->devinfo |= usb_pipecontrol (pipe)
473 ? (USB_ENDPOINT_XFER_CONTROL << 11)
474 : (USB_ENDPOINT_XFER_BULK << 11);
475 if (usb_pipein (pipe))
476 clear->devinfo |= 1 << 15;
477
478 /* tell keventd to clear state for this TT */
479 spin_lock_irqsave (&tt->lock, flags);
480 list_add_tail (&clear->clear_list, &tt->clear_list);
481 schedule_work (&tt->kevent);
482 spin_unlock_irqrestore (&tt->lock, flags);
483}
484
485static void hub_power_on(struct usb_hub *hub)
486{
487 int port1;
b789696a 488 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
4489a571
AS		 489 u16 wHubCharacteristics =
490 le16_to_cpu(hub->descriptor->wHubCharacteristics);
491
492 /* Enable power on each port. Some hubs have reserved values
493 * of LPSM (> 2) in their descriptors, even though they are
494 * USB 2.0 hubs. Some hubs do not implement port-power switching
495 * but only emulate it. In all cases, the ports won't work
496 * unless we send these messages to the hub.
497 */
498 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
1da177e4 499 dev_dbg(hub->intfdev, "enabling power on all ports\n");
4489a571
AS		 500 else
501 dev_dbg(hub->intfdev, "trying to enable port power on "
502 "non-switchable hub\n");
503 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
504 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
1da177e4 505
b789696a
DB		 506 /* Wait at least 100 msec for power to become stable */
507 msleep(max(pgood_delay, (unsigned) 100));
1da177e4
LT		 508}
509
02c399ee 510static void hub_quiesce(struct usb_hub *hub)
1da177e4 511{
979d5199 512 /* (nonblocking) khubd and related activity won't re-trigger */
1da177e4 513 hub->quiescing = 1;
c9f89fa4 514 hub->activating = 0;
979d5199 515
979d5199 516 /* (blocking) stop khubd and related activity */
1da177e4
LT		 517 usb_kill_urb(hub->urb);
518 if (hub->has_indicators)
519 cancel_delayed_work(&hub->leds);
520 if (hub->has_indicators || hub->tt.hub)
521 flush_scheduled_work();
522}
523
524static void hub_activate(struct usb_hub *hub)
525{
526 int status;
527
528 hub->quiescing = 0;
529 hub->activating = 1;
40f122f3 530
1da177e4
LT		 531 status = usb_submit_urb(hub->urb, GFP_NOIO);
532 if (status < 0)
533 dev_err(hub->intfdev, "activate --> %d\n", status);
534 if (hub->has_indicators && blinkenlights)
535 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
536
537 /* scan all ports ASAP */
538 kick_khubd(hub);
539}
540
541static int hub_hub_status(struct usb_hub *hub,
542 u16 *status, u16 *change)
543{
544 int ret;
545
db90e7a1 546 mutex_lock(&hub->status_mutex);
1da177e4
LT		 547 ret = get_hub_status(hub->hdev, &hub->status->hub);
548 if (ret < 0)
549 dev_err (hub->intfdev,
550 "%s failed (err = %d)\n", __FUNCTION__, ret);
551 else {
552 *status = le16_to_cpu(hub->status->hub.wHubStatus);
553 *change = le16_to_cpu(hub->status->hub.wHubChange);
554 ret = 0;
555 }
db90e7a1 556 mutex_unlock(&hub->status_mutex);
1da177e4
LT		 557 return ret;
558}
559
8b28c752
AS		 560static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
561{
562 struct usb_device *hdev = hub->hdev;
0458d5b4 563 int ret = 0;
8b28c752 564
0458d5b4 565 if (hdev->children[port1-1] && set_state)
8b28c752
AS		 566 usb_set_device_state(hdev->children[port1-1],
567 USB_STATE_NOTATTACHED);
0458d5b4
AS		 568 if (!hub->error)
569 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
8b28c752
AS		 570 if (ret)
571 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
0458d5b4 572 port1, ret);
8b28c752
AS		 573 return ret;
574}
575
0458d5b4
AS		 576/*
577 * Disable a port and mark a logical connnect-change event, so that some
578 * time later khubd will disconnect() any existing usb_device on the port
579 * and will re-enumerate if there actually is a device attached.
580 */
581static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
582{
583 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
584 hub_port_disable(hub, port1, 1);
7d069b7d 585
0458d5b4
AS		 586 /* FIXME let caller ask to power down the port:
587 * - some devices won't enumerate without a VBUS power cycle
588 * - SRP saves power that way
589 * - ... new call, TBD ...
590 * That's easy if this hub can switch power per-port, and
591 * khubd reactivates the port later (timer, SRP, etc).
592 * Powerdown must be optional, because of reset/DFU.
593 */
594
595 set_bit(port1, hub->change_bits);
596 kick_khubd(hub);
597}
598
0458d5b4 599/* caller has locked the hub device */
f07600cf 600static int hub_pre_reset(struct usb_interface *intf)
0458d5b4
AS		 601{
602 struct usb_hub *hub = usb_get_intfdata(intf);
b41a60ec
AS		 603 struct usb_device *hdev = hub->hdev;
604 int i;
0458d5b4 605
b41a60ec
AS		 606 /* Disconnect all the children */
607 for (i = 0; i < hdev->maxchild; ++i) {
608 if (hdev->children[i])
609 usb_disconnect(&hdev->children[i]);
610 }
7d069b7d 611 hub_quiesce(hub);
f07600cf 612 return 0;
7d069b7d
AS		 613}
614
615/* caller has locked the hub device */
f07600cf 616static int hub_post_reset(struct usb_interface *intf)
7d069b7d 617{
7de18d8b
AS		 618 struct usb_hub *hub = usb_get_intfdata(intf);
619
7d069b7d 620 hub_power_on(hub);
0458d5b4 621 hub_activate(hub);
f07600cf 622 return 0;
7d069b7d
AS		 623}
624
1da177e4
LT		 625static int hub_configure(struct usb_hub *hub,
626 struct usb_endpoint_descriptor *endpoint)
627{
628 struct usb_device *hdev = hub->hdev;
629 struct device *hub_dev = hub->intfdev;
630 u16 hubstatus, hubchange;
74ad9bd2 631 u16 wHubCharacteristics;
1da177e4
LT		 632 unsigned int pipe;
633 int maxp, ret;
634 char *message;
635
636 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
637 &hub->buffer_dma);
638 if (!hub->buffer) {
639 message = "can't allocate hub irq buffer";
640 ret = -ENOMEM;
641 goto fail;
642 }
643
644 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
645 if (!hub->status) {
646 message = "can't kmalloc hub status buffer";
647 ret = -ENOMEM;
648 goto fail;
649 }
db90e7a1 650 mutex_init(&hub->status_mutex);
1da177e4
LT		 651
652 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
653 if (!hub->descriptor) {
654 message = "can't kmalloc hub descriptor";
655 ret = -ENOMEM;
656 goto fail;
657 }
658
659 /* Request the entire hub descriptor.
660 * hub->descriptor can handle USB_MAXCHILDREN ports,
661 * but the hub can/will return fewer bytes here.
662 */
663 ret = get_hub_descriptor(hdev, hub->descriptor,
664 sizeof(*hub->descriptor));
665 if (ret < 0) {
666 message = "can't read hub descriptor";
667 goto fail;
668 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
669 message = "hub has too many ports!";
670 ret = -ENODEV;
671 goto fail;
672 }
673
674 hdev->maxchild = hub->descriptor->bNbrPorts;
675 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
676 (hdev->maxchild == 1) ? "" : "s");
677
74ad9bd2 678 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4 679
74ad9bd2 680 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
1da177e4
LT		 681 int i;
682 char portstr [USB_MAXCHILDREN + 1];
683
684 for (i = 0; i < hdev->maxchild; i++)
685 portstr[i] = hub->descriptor->DeviceRemovable
686 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
687 ? 'F' : 'R';
688 portstr[hdev->maxchild] = 0;
689 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
690 } else
691 dev_dbg(hub_dev, "standalone hub\n");
692
74ad9bd2 693 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1da177e4
LT		 694 case 0x00:
695 dev_dbg(hub_dev, "ganged power switching\n");
696 break;
697 case 0x01:
698 dev_dbg(hub_dev, "individual port power switching\n");
699 break;
700 case 0x02:
701 case 0x03:
702 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
703 break;
704 }
705
74ad9bd2 706 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1da177e4
LT		 707 case 0x00:
708 dev_dbg(hub_dev, "global over-current protection\n");
709 break;
710 case 0x08:
711 dev_dbg(hub_dev, "individual port over-current protection\n");
712 break;
713 case 0x10:
714 case 0x18:
715 dev_dbg(hub_dev, "no over-current protection\n");
716 break;
717 }
718
719 spin_lock_init (&hub->tt.lock);
720 INIT_LIST_HEAD (&hub->tt.clear_list);
c4028958 721 INIT_WORK (&hub->tt.kevent, hub_tt_kevent);
1da177e4
LT		 722 switch (hdev->descriptor.bDeviceProtocol) {
723 case 0:
724 break;
725 case 1:
726 dev_dbg(hub_dev, "Single TT\n");
727 hub->tt.hub = hdev;
728 break;
729 case 2:
730 ret = usb_set_interface(hdev, 0, 1);
731 if (ret == 0) {
732 dev_dbg(hub_dev, "TT per port\n");
733 hub->tt.multi = 1;
734 } else
735 dev_err(hub_dev, "Using single TT (err %d)\n",
736 ret);
737 hub->tt.hub = hdev;
738 break;
739 default:
740 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
741 hdev->descriptor.bDeviceProtocol);
742 break;
743 }
744
e09711ae 745 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
74ad9bd2 746 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
e09711ae
DB		 747 case HUB_TTTT_8_BITS:
748 if (hdev->descriptor.bDeviceProtocol != 0) {
749 hub->tt.think_time = 666;
750 dev_dbg(hub_dev, "TT requires at most %d "
751 "FS bit times (%d ns)\n",
752 8, hub->tt.think_time);
753 }
1da177e4 754 break;
e09711ae
DB		 755 case HUB_TTTT_16_BITS:
756 hub->tt.think_time = 666 * 2;
757 dev_dbg(hub_dev, "TT requires at most %d "
758 "FS bit times (%d ns)\n",
759 16, hub->tt.think_time);
1da177e4 760 break;
e09711ae
DB		 761 case HUB_TTTT_24_BITS:
762 hub->tt.think_time = 666 * 3;
763 dev_dbg(hub_dev, "TT requires at most %d "
764 "FS bit times (%d ns)\n",
765 24, hub->tt.think_time);
1da177e4 766 break;
e09711ae
DB		 767 case HUB_TTTT_32_BITS:
768 hub->tt.think_time = 666 * 4;
769 dev_dbg(hub_dev, "TT requires at most %d "
770 "FS bit times (%d ns)\n",
771 32, hub->tt.think_time);
1da177e4
LT		 772 break;
773 }
774
775 /* probe() zeroes hub->indicator[] */
74ad9bd2 776 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1da177e4
LT		 777 hub->has_indicators = 1;
778 dev_dbg(hub_dev, "Port indicators are supported\n");
779 }
780
781 dev_dbg(hub_dev, "power on to power good time: %dms\n",
782 hub->descriptor->bPwrOn2PwrGood * 2);
783
784 /* power budgeting mostly matters with bus-powered hubs,
785 * and battery-powered root hubs (may provide just 8 mA).
786 */
787 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
55c52718 788 if (ret < 2) {
1da177e4
LT		 789 message = "can't get hub status";
790 goto fail;
791 }
7d35b929
AS		 792 le16_to_cpus(&hubstatus);
793 if (hdev == hdev->bus->root_hub) {
55c52718
AS		 794 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
795 hub->mA_per_port = 500;
796 else {
797 hub->mA_per_port = hdev->bus_mA;
798 hub->limited_power = 1;
799 }
7d35b929 800 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1da177e4
LT		 801 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
802 hub->descriptor->bHubContrCurrent);
55c52718
AS		 803 hub->limited_power = 1;
804 if (hdev->maxchild > 0) {
805 int remaining = hdev->bus_mA -
806 hub->descriptor->bHubContrCurrent;
807
808 if (remaining < hdev->maxchild * 100)
809 dev_warn(hub_dev,
810 "insufficient power available "
811 "to use all downstream ports\n");
812 hub->mA_per_port = 100; /* 7.2.1.1 */
813 }
814 } else { /* Self-powered external hub */
815 /* FIXME: What about battery-powered external hubs that
816 * provide less current per port? */
817 hub->mA_per_port = 500;
7d35b929 818 }
55c52718
AS		 819 if (hub->mA_per_port < 500)
820 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
821 hub->mA_per_port);
1da177e4
LT		 822
823 ret = hub_hub_status(hub, &hubstatus, &hubchange);
824 if (ret < 0) {
825 message = "can't get hub status";
826 goto fail;
827 }
828
829 /* local power status reports aren't always correct */
830 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
831 dev_dbg(hub_dev, "local power source is %s\n",
832 (hubstatus & HUB_STATUS_LOCAL_POWER)
833 ? "lost (inactive)" : "good");
834
74ad9bd2 835 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1da177e4
LT		 836 dev_dbg(hub_dev, "%sover-current condition exists\n",
837 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
838
88fafff9 839 /* set up the interrupt endpoint
840 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
841 * bytes as USB2.0[11.12.3] says because some hubs are known
842 * to send more data (and thus cause overflow). For root hubs,
843 * maxpktsize is defined in hcd.c's fake endpoint descriptors
844 * to be big enough for at least USB_MAXCHILDREN ports. */
1da177e4
LT		 845 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
846 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
847
848 if (maxp > sizeof(*hub->buffer))
849 maxp = sizeof(*hub->buffer);
850
851 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
852 if (!hub->urb) {
853 message = "couldn't allocate interrupt urb";
854 ret = -ENOMEM;
855 goto fail;
856 }
857
858 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
859 hub, endpoint->bInterval);
860 hub->urb->transfer_dma = hub->buffer_dma;
861 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
862
863 /* maybe cycle the hub leds */
864 if (hub->has_indicators && blinkenlights)
865 hub->indicator [0] = INDICATOR_CYCLE;
866
867 hub_power_on(hub);
868 hub_activate(hub);
869 return 0;
870
871fail:
872 dev_err (hub_dev, "config failed, %s (err %d)\n",
873 message, ret);
874 /* hub_disconnect() frees urb and descriptor */
875 return ret;
876}
877
e8054854
AS		 878static void hub_release(struct kref *kref)
879{
880 struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
881
882 usb_put_intf(to_usb_interface(hub->intfdev));
883 kfree(hub);
884}
885
1da177e4
LT		 886static unsigned highspeed_hubs;
887
888static void hub_disconnect(struct usb_interface *intf)
889{
890 struct usb_hub *hub = usb_get_intfdata (intf);
e8054854
AS		 891
892 /* Take the hub off the event list and don't let it be added again */
893 spin_lock_irq(&hub_event_lock);
894 list_del_init(&hub->event_list);
895 hub->disconnected = 1;
896 spin_unlock_irq(&hub_event_lock);
1da177e4 897
7de18d8b
AS		 898 /* Disconnect all children and quiesce the hub */
899 hub->error = 0;
900 hub_pre_reset(intf);
901
8b28c752 902 usb_set_intfdata (intf, NULL);
1da177e4 903
e8054854 904 if (hub->hdev->speed == USB_SPEED_HIGH)
1da177e4
LT		 905 highspeed_hubs--;
906
1da177e4 907 usb_free_urb(hub->urb);
1bc3c9e1 908 kfree(hub->descriptor);
1bc3c9e1 909 kfree(hub->status);
e8054854
AS		 910 usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer,
911 hub->buffer_dma);
1da177e4 912
e8054854 913 kref_put(&hub->kref, hub_release);
1da177e4
LT		 914}
915
916static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
917{
918 struct usb_host_interface *desc;
919 struct usb_endpoint_descriptor *endpoint;
920 struct usb_device *hdev;
921 struct usb_hub *hub;
922
923 desc = intf->cur_altsetting;
924 hdev = interface_to_usbdev(intf);
925
89ccbdc9
DB		 926#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
927 if (hdev->parent) {
928 dev_warn(&intf->dev, "ignoring external hub\n");
929 return -ENODEV;
930 }
931#endif
932
1da177e4
LT		 933 /* Some hubs have a subclass of 1, which AFAICT according to the */
934 /* specs is not defined, but it works */
935 if ((desc->desc.bInterfaceSubClass != 0) &&
936 (desc->desc.bInterfaceSubClass != 1)) {
937descriptor_error:
938 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
939 return -EIO;
940 }
941
942 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
943 if (desc->desc.bNumEndpoints != 1)
944 goto descriptor_error;
945
946 endpoint = &desc->endpoint[0].desc;
947
fbf81c29
LFC		 948 /* If it's not an interrupt in endpoint, we'd better punt! */
949 if (!usb_endpoint_is_int_in(endpoint))
1da177e4
LT		 950 goto descriptor_error;
951
952 /* We found a hub */
953 dev_info (&intf->dev, "USB hub found\n");
954
0a1ef3b5 955 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1da177e4
LT		 956 if (!hub) {
957 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
958 return -ENOMEM;
959 }
960
e8054854 961 kref_init(&hub->kref);
1da177e4
LT		 962 INIT_LIST_HEAD(&hub->event_list);
963 hub->intfdev = &intf->dev;
964 hub->hdev = hdev;
c4028958 965 INIT_DELAYED_WORK(&hub->leds, led_work);
e8054854 966 usb_get_intf(intf);
1da177e4
LT		 967
968 usb_set_intfdata (intf, hub);
40f122f3 969 intf->needs_remote_wakeup = 1;
1da177e4
LT		 970
971 if (hdev->speed == USB_SPEED_HIGH)
972 highspeed_hubs++;
973
974 if (hub_configure(hub, endpoint) >= 0)
975 return 0;
976
977 hub_disconnect (intf);
978 return -ENODEV;
979}
980
981static int
982hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
983{
984 struct usb_device *hdev = interface_to_usbdev (intf);
985
986 /* assert ifno == 0 (part of hub spec) */
987 switch (code) {
988 case USBDEVFS_HUB_PORTINFO: {
989 struct usbdevfs_hub_portinfo *info = user_data;
990 int i;
991
992 spin_lock_irq(&device_state_lock);
993 if (hdev->devnum <= 0)
994 info->nports = 0;
995 else {
996 info->nports = hdev->maxchild;
997 for (i = 0; i < info->nports; i++) {
998 if (hdev->children[i] == NULL)
999 info->port[i] = 0;
1000 else
1001 info->port[i] =
1002 hdev->children[i]->devnum;
1003 }
1004 }
1005 spin_unlock_irq(&device_state_lock);
1006
1007 return info->nports + 1;
1008 }
1009
1010 default:
1011 return -ENOSYS;
1012 }
1013}
1014
1da177e4 1015
1da177e4
LT		 1016static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1017{
1018 int i;
1019
1020 for (i = 0; i < udev->maxchild; ++i) {
1021 if (udev->children[i])
1022 recursively_mark_NOTATTACHED(udev->children[i]);
1023 }
ee49fb5d
AS		 1024 if (udev->state == USB_STATE_SUSPENDED)
1025 udev->discon_suspended = 1;
1da177e4
LT		 1026 udev->state = USB_STATE_NOTATTACHED;
1027}
1028
1029/**
1030 * usb_set_device_state - change a device's current state (usbcore, hcds)
1031 * @udev: pointer to device whose state should be changed
1032 * @new_state: new state value to be stored
1033 *
1034 * udev->state is _not_ fully protected by the device lock. Although
1035 * most transitions are made only while holding the lock, the state can
1036 * can change to USB_STATE_NOTATTACHED at almost any time. This
1037 * is so that devices can be marked as disconnected as soon as possible,
1038 * without having to wait for any semaphores to be released. As a result,
1039 * all changes to any device's state must be protected by the
1040 * device_state_lock spinlock.
1041 *
1042 * Once a device has been added to the device tree, all changes to its state
1043 * should be made using this routine. The state should _not_ be set directly.
1044 *
1045 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1046 * Otherwise udev->state is set to new_state, and if new_state is
1047 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1048 * to USB_STATE_NOTATTACHED.
1049 */
1050void usb_set_device_state(struct usb_device *udev,
1051 enum usb_device_state new_state)
1052{
1053 unsigned long flags;
1054
1055 spin_lock_irqsave(&device_state_lock, flags);
1056 if (udev->state == USB_STATE_NOTATTACHED)
1057 ; /* do nothing */
b94dc6b5 1058 else if (new_state != USB_STATE_NOTATTACHED) {
fb669cc0
DB		 1059
1060 /* root hub wakeup capabilities are managed out-of-band
1061 * and may involve silicon errata ... ignore them here.
1062 */
1063 if (udev->parent) {
645daaab
AS		 1064 if (udev->state == USB_STATE_SUSPENDED
1065 || new_state == USB_STATE_SUSPENDED)
1066 ; /* No change to wakeup settings */
1067 else if (new_state == USB_STATE_CONFIGURED)
fb669cc0
DB		 1068 device_init_wakeup(&udev->dev,
1069 (udev->actconfig->desc.bmAttributes
1070 & USB_CONFIG_ATT_WAKEUP));
645daaab 1071 else
fb669cc0
DB		 1072 device_init_wakeup(&udev->dev, 0);
1073 }
645daaab 1074 udev->state = new_state;
b94dc6b5 1075 } else
1da177e4
LT		 1076 recursively_mark_NOTATTACHED(udev);
1077 spin_unlock_irqrestore(&device_state_lock, flags);
1078}
1da177e4 1079
1da177e4
LT		 1080static void choose_address(struct usb_device *udev)
1081{
1082 int devnum;
1083 struct usb_bus *bus = udev->bus;
1084
1085 /* If khubd ever becomes multithreaded, this will need a lock */
1086
1087 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1088 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1089 bus->devnum_next);
1090 if (devnum >= 128)
1091 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1092
1093 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1094
1095 if (devnum < 128) {
1096 set_bit(devnum, bus->devmap.devicemap);
1097 udev->devnum = devnum;
1098 }
1099}
1100
1101static void release_address(struct usb_device *udev)
1102{
1103 if (udev->devnum > 0) {
1104 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1105 udev->devnum = -1;
1106 }
1107}
1108
d5d4db70
AS		 1109#ifdef CONFIG_USB_SUSPEND
1110
1111static void usb_stop_pm(struct usb_device *udev)
1112{
1113 /* Synchronize with the ksuspend thread to prevent any more
1114 * autosuspend requests from being submitted, and decrement
1115 * the parent's count of unsuspended children.
1116 */
1117 usb_pm_lock(udev);
1118 if (udev->parent && !udev->discon_suspended)
1119 usb_autosuspend_device(udev->parent);
1120 usb_pm_unlock(udev);
1121
1122 /* Stop any autosuspend requests already submitted */
1123 cancel_rearming_delayed_work(&udev->autosuspend);
1124}
1125
1126#else
1127
1128static inline void usb_stop_pm(struct usb_device *udev)
1129{ }
1130
1131#endif
1132
1da177e4
LT		 1133/**
1134 * usb_disconnect - disconnect a device (usbcore-internal)
1135 * @pdev: pointer to device being disconnected
1136 * Context: !in_interrupt ()
1137 *
1138 * Something got disconnected. Get rid of it and all of its children.
1139 *
1140 * If *pdev is a normal device then the parent hub must already be locked.
1141 * If *pdev is a root hub then this routine will acquire the
1142 * usb_bus_list_lock on behalf of the caller.
1143 *
1144 * Only hub drivers (including virtual root hub drivers for host
1145 * controllers) should ever call this.
1146 *
1147 * This call is synchronous, and may not be used in an interrupt context.
1148 */
1149void usb_disconnect(struct usb_device **pdev)
1150{
1151 struct usb_device *udev = *pdev;
1152 int i;
1153
1154 if (!udev) {
1155 pr_debug ("%s nodev\n", __FUNCTION__);
1156 return;
1157 }
1158
1159 /* mark the device as inactive, so any further urb submissions for
1160 * this device (and any of its children) will fail immediately.
1161 * this quiesces everyting except pending urbs.
1162 */
1163 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1da177e4
LT		 1164 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1165
9ad3d6cc
AS		 1166 usb_lock_device(udev);
1167
1da177e4
LT		 1168 /* Free up all the children before we remove this device */
1169 for (i = 0; i < USB_MAXCHILDREN; i++) {
1170 if (udev->children[i])
1171 usb_disconnect(&udev->children[i]);
1172 }
1173
1174 /* deallocate hcd/hardware state ... nuking all pending urbs and
1175 * cleaning up all state associated with the current configuration
1176 * so that the hardware is now fully quiesced.
1177 */
782da727 1178 dev_dbg (&udev->dev, "unregistering device\n");
1da177e4
LT		 1179 usb_disable_device(udev, 0);
1180
782da727
AS		 1181 usb_unlock_device(udev);
1182
1183 /* Unregister the device. The device driver is responsible
1184 * for removing the device files from usbfs and sysfs and for
1185 * de-configuring the device.
1186 */
1187 device_del(&udev->dev);
3099e75a 1188
782da727 1189 /* Free the device number and delete the parent's children[]
1da177e4
LT		 1190 * (or root_hub) pointer.
1191 */
1da177e4 1192 release_address(udev);
1da177e4
LT		 1193
1194 /* Avoid races with recursively_mark_NOTATTACHED() */
1195 spin_lock_irq(&device_state_lock);
1196 *pdev = NULL;
1197 spin_unlock_irq(&device_state_lock);
1198
d5d4db70 1199 usb_stop_pm(udev);
ee49fb5d 1200
782da727 1201 put_device(&udev->dev);
1da177e4
LT		 1202}
1203
1204#ifdef DEBUG
1205static void show_string(struct usb_device *udev, char *id, char *string)
1206{
1207 if (!string)
1208 return;
1209 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1210}
1211
1212#else
1213static inline void show_string(struct usb_device *udev, char *id, char *string)
1214{}
1215#endif
1216
1da177e4
LT		 1217
1218#ifdef CONFIG_USB_OTG
1219#include "otg_whitelist.h"
1220#endif
1221
3ede760f
ON		 1222/**
1223 * usb_new_device - perform initial device setup (usbcore-internal)
1224 * @udev: newly addressed device (in ADDRESS state)
1225 *
1226 * This is called with devices which have been enumerated, but not yet
1227 * configured. The device descriptor is available, but not descriptors
1228 * for any device configuration. The caller must have locked either
1229 * the parent hub (if udev is a normal device) or else the
1230 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1231 * udev has already been installed, but udev is not yet visible through
1232 * sysfs or other filesystem code.
1233 *
1234 * It will return if the device is configured properly or not. Zero if
1235 * the interface was registered with the driver core; else a negative
1236 * errno value.
1237 *
1238 * This call is synchronous, and may not be used in an interrupt context.
1239 *
1240 * Only the hub driver or root-hub registrar should ever call this.
1241 */
1242int usb_new_device(struct usb_device *udev)
1da177e4
LT		 1243{
1244 int err;
1da177e4 1245
7ceec1f1
ON		 1246 /* Determine quirks */
1247 usb_detect_quirks(udev);
1248
1da177e4
LT		 1249 err = usb_get_configuration(udev);
1250 if (err < 0) {
1251 dev_err(&udev->dev, "can't read configurations, error %d\n",
1252 err);
1253 goto fail;
1254 }
1255
1256 /* read the standard strings and cache them if present */
4f62efe6
AS		 1257 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1258 udev->manufacturer = usb_cache_string(udev,
1259 udev->descriptor.iManufacturer);
1260 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1da177e4
LT		 1261
1262 /* Tell the world! */
1263 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1264 "SerialNumber=%d\n",
1265 udev->descriptor.iManufacturer,
1266 udev->descriptor.iProduct,
1267 udev->descriptor.iSerialNumber);
1268 show_string(udev, "Product", udev->product);
1269 show_string(udev, "Manufacturer", udev->manufacturer);
1270 show_string(udev, "SerialNumber", udev->serial);
1271
1272#ifdef CONFIG_USB_OTG
1273 /*
1274 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1275 * to wake us after we've powered off VBUS; and HNP, switching roles
1276 * "host" to "peripheral". The OTG descriptor helps figure this out.
1277 */
1278 if (!udev->bus->is_b_host
1279 && udev->config
1280 && udev->parent == udev->bus->root_hub) {
1281 struct usb_otg_descriptor *desc = 0;
1282 struct usb_bus *bus = udev->bus;
1283
1284 /* descriptor may appear anywhere in config */
1285 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1286 le16_to_cpu(udev->config[0].desc.wTotalLength),
1287 USB_DT_OTG, (void **) &desc) == 0) {
1288 if (desc->bmAttributes & USB_OTG_HNP) {
12c3da34 1289 unsigned port1 = udev->portnum;
fc849b85 1290
1da177e4
LT		 1291 dev_info(&udev->dev,
1292 "Dual-Role OTG device on %sHNP port\n",
1293 (port1 == bus->otg_port)
1294 ? "" : "non-");
1295
1296 /* enable HNP before suspend, it's simpler */
1297 if (port1 == bus->otg_port)
1298 bus->b_hnp_enable = 1;
1299 err = usb_control_msg(udev,
1300 usb_sndctrlpipe(udev, 0),
1301 USB_REQ_SET_FEATURE, 0,
1302 bus->b_hnp_enable
1303 ? USB_DEVICE_B_HNP_ENABLE
1304 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1305 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1306 if (err < 0) {
1307 /* OTG MESSAGE: report errors here,
1308 * customize to match your product.
1309 */
1310 dev_info(&udev->dev,
1311 "can't set HNP mode; %d\n",
1312 err);
1313 bus->b_hnp_enable = 0;
1314 }
1315 }
1316 }
1317 }
1318
1319 if (!is_targeted(udev)) {
1320
1321 /* Maybe it can talk to us, though we can't talk to it.
1322 * (Includes HNP test device.)
1323 */
1324 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
4956eccd 1325 err = usb_port_suspend(udev);
1da177e4
LT		 1326 if (err < 0)
1327 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1328 }
ffcdc18d 1329 err = -ENOTSUPP;
1da177e4
LT		 1330 goto fail;
1331 }
1332#endif
1333
9f8b17e6
KS		 1334 /* export the usbdev device-node for libusb */
1335 udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
1336 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1337
782da727 1338 /* Register the device. The device driver is responsible
9f8b17e6
KS		 1339 * for adding the device files to sysfs and for configuring
1340 * the device.
782da727 1341 */
9f8b17e6 1342 err = device_add(&udev->dev);
1da177e4
LT		 1343 if (err) {
1344 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1345 goto fail;
1346 }
9ad3d6cc 1347
ee49fb5d
AS		 1348 /* Increment the parent's count of unsuspended children */
1349 if (udev->parent)
94fcda1f 1350 usb_autoresume_device(udev->parent);
ee49fb5d 1351
c066475e 1352exit:
c066475e 1353 return err;
1da177e4
LT		 1354
1355fail:
1356 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
c066475e 1357 goto exit;
1da177e4
LT		 1358}
1359
1da177e4
LT		 1360static int hub_port_status(struct usb_hub *hub, int port1,
1361 u16 *status, u16 *change)
1362{
1363 int ret;
1364
db90e7a1 1365 mutex_lock(&hub->status_mutex);
1da177e4 1366 ret = get_port_status(hub->hdev, port1, &hub->status->port);
d25450c6 1367 if (ret < 4) {
1da177e4
LT		 1368 dev_err (hub->intfdev,
1369 "%s failed (err = %d)\n", __FUNCTION__, ret);
d25450c6
AS		 1370 if (ret >= 0)
1371 ret = -EIO;
1372 } else {
1da177e4
LT		 1373 *status = le16_to_cpu(hub->status->port.wPortStatus);
1374 *change = le16_to_cpu(hub->status->port.wPortChange);
1375 ret = 0;
1376 }
db90e7a1 1377 mutex_unlock(&hub->status_mutex);
1da177e4
LT		 1378 return ret;
1379}
1380
0165de09
IPG		 1381
1382/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1383static unsigned hub_is_wusb(struct usb_hub *hub)
1384{
1385 struct usb_hcd *hcd;
1386 if (hub->hdev->parent != NULL) /* not a root hub? */
1387 return 0;
1388 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1389 return hcd->wireless;
1390}
1391
1392
1da177e4
LT		 1393#define PORT_RESET_TRIES 5
1394#define SET_ADDRESS_TRIES 2
1395#define GET_DESCRIPTOR_TRIES 2
1396#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1397#define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1398
1399#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1400#define HUB_SHORT_RESET_TIME 10
1401#define HUB_LONG_RESET_TIME 200
1402#define HUB_RESET_TIMEOUT 500
1403
1404static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1405 struct usb_device *udev, unsigned int delay)
1406{
1407 int delay_time, ret;
1408 u16 portstatus;
1409 u16 portchange;
1410
1411 for (delay_time = 0;
1412 delay_time < HUB_RESET_TIMEOUT;
1413 delay_time += delay) {
1414 /* wait to give the device a chance to reset */
1415 msleep(delay);
1416
1417 /* read and decode port status */
1418 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1419 if (ret < 0)
1420 return ret;
1421
1422 /* Device went away? */
1423 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1424 return -ENOTCONN;
1425
dd4dd19e 1426 /* bomb out completely if the connection bounced */
1da177e4 1427 if ((portchange & USB_PORT_STAT_C_CONNECTION))
dd4dd19e 1428 return -ENOTCONN;
1da177e4
LT		 1429
1430 /* if we`ve finished resetting, then break out of the loop */
1431 if (!(portstatus & USB_PORT_STAT_RESET) &&
1432 (portstatus & USB_PORT_STAT_ENABLE)) {
0165de09
IPG		 1433 if (hub_is_wusb(hub))
1434 udev->speed = USB_SPEED_VARIABLE;
1435 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1da177e4
LT		 1436 udev->speed = USB_SPEED_HIGH;
1437 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1438 udev->speed = USB_SPEED_LOW;
1439 else
1440 udev->speed = USB_SPEED_FULL;
1441 return 0;
1442 }
1443
1444 /* switch to the long delay after two short delay failures */
1445 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1446 delay = HUB_LONG_RESET_TIME;
1447
1448 dev_dbg (hub->intfdev,
1449 "port %d not reset yet, waiting %dms\n",
1450 port1, delay);
1451 }
1452
1453 return -EBUSY;
1454}
1455
1456static int hub_port_reset(struct usb_hub *hub, int port1,
1457 struct usb_device *udev, unsigned int delay)
1458{
1459 int i, status;
1460
1461 /* Reset the port */
1462 for (i = 0; i < PORT_RESET_TRIES; i++) {
1463 status = set_port_feature(hub->hdev,
1464 port1, USB_PORT_FEAT_RESET);
1465 if (status)
1466 dev_err(hub->intfdev,
1467 "cannot reset port %d (err = %d)\n",
1468 port1, status);
1469 else {
1470 status = hub_port_wait_reset(hub, port1, udev, delay);
dd16525b 1471 if (status && status != -ENOTCONN)
1da177e4
LT		 1472 dev_dbg(hub->intfdev,
1473 "port_wait_reset: err = %d\n",
1474 status);
1475 }
1476
1477 /* return on disconnect or reset */
1478 switch (status) {
1479 case 0:
b789696a
DB		 1480 /* TRSTRCY = 10 ms; plus some extra */
1481 msleep(10 + 40);
1da177e4
LT		 1482 /* FALL THROUGH */
1483 case -ENOTCONN:
1484 case -ENODEV:
1485 clear_port_feature(hub->hdev,
1486 port1, USB_PORT_FEAT_C_RESET);
1487 /* FIXME need disconnect() for NOTATTACHED device */
1488 usb_set_device_state(udev, status
1489 ? USB_STATE_NOTATTACHED
1490 : USB_STATE_DEFAULT);
1491 return status;
1492 }
1493
1494 dev_dbg (hub->intfdev,
1495 "port %d not enabled, trying reset again...\n",
1496 port1);
1497 delay = HUB_LONG_RESET_TIME;
1498 }
1499
1500 dev_err (hub->intfdev,
1501 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1502 port1);
1503
1504 return status;
1505}
1506
d388dab7 1507#ifdef CONFIG_PM
1da177e4
LT		 1508
1509#ifdef CONFIG_USB_SUSPEND
1510
1511/*
624d6c07
AS		 1512 * usb_port_suspend - suspend a usb device's upstream port
1513 * @udev: device that's no longer in active use, not a root hub
1514 * Context: must be able to sleep; device not locked; pm locks held
1515 *
1516 * Suspends a USB device that isn't in active use, conserving power.
1517 * Devices may wake out of a suspend, if anything important happens,
1518 * using the remote wakeup mechanism. They may also be taken out of
1519 * suspend by the host, using usb_port_resume(). It's also routine
1520 * to disconnect devices while they are suspended.
1521 *
1522 * This only affects the USB hardware for a device; its interfaces
1523 * (and, for hubs, child devices) must already have been suspended.
1524 *
1da177e4
LT		 1525 * Selective port suspend reduces power; most suspended devices draw
1526 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1527 * All devices below the suspended port are also suspended.
1528 *
1529 * Devices leave suspend state when the host wakes them up. Some devices
1530 * also support "remote wakeup", where the device can activate the USB
1531 * tree above them to deliver data, such as a keypress or packet. In
1532 * some cases, this wakes the USB host.
624d6c07
AS		 1533 *
1534 * Suspending OTG devices may trigger HNP, if that's been enabled
1535 * between a pair of dual-role devices. That will change roles, such
1536 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1537 *
1538 * Devices on USB hub ports have only one "suspend" state, corresponding
1539 * to ACPI D2, "may cause the device to lose some context".
1540 * State transitions include:
1541 *
1542 * - suspend, resume ... when the VBUS power link stays live
1543 * - suspend, disconnect ... VBUS lost
1544 *
1545 * Once VBUS drop breaks the circuit, the port it's using has to go through
1546 * normal re-enumeration procedures, starting with enabling VBUS power.
1547 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1548 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1549 * timer, no SRP, no requests through sysfs.
1550 *
1551 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1552 * the root hub for their bus goes into global suspend ... so we don't
1553 * (falsely) update the device power state to say it suspended.
1554 *
1555 * Returns 0 on success, else negative errno.
1da177e4 1556 */
624d6c07 1557int usb_port_suspend(struct usb_device *udev)
1da177e4 1558{
624d6c07
AS		 1559 struct usb_hub *hub = hdev_to_hub(udev->parent);
1560 int port1 = udev->portnum;
1561 int status;
1da177e4
LT		 1562
1563 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1564
1565 /* enable remote wakeup when appropriate; this lets the device
1566 * wake up the upstream hub (including maybe the root hub).
1567 *
1568 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1569 * we don't explicitly enable it here.
1570 */
645daaab 1571 if (udev->do_remote_wakeup) {
1da177e4
LT		 1572 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1573 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1574 USB_DEVICE_REMOTE_WAKEUP, 0,
1575 NULL, 0,
1576 USB_CTRL_SET_TIMEOUT);
1577 if (status)
624d6c07
AS		 1578 dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
1579 status);
1da177e4
LT		 1580 }
1581
1582 /* see 7.1.7.6 */
1583 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1584 if (status) {
624d6c07
AS		 1585 dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
1586 port1, status);
1da177e4
LT		 1587 /* paranoia: "should not happen" */
1588 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1589 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1590 USB_DEVICE_REMOTE_WAKEUP, 0,
1591 NULL, 0,
1592 USB_CTRL_SET_TIMEOUT);
1593 } else {
1594 /* device has up to 10 msec to fully suspend */
645daaab
AS		 1595 dev_dbg(&udev->dev, "usb %ssuspend\n",
1596 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1597 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1598 msleep(10);
1599 }
1600 return status;
1601}
1602
1da177e4 1603/*
390a8c34
DB		 1604 * If the USB "suspend" state is in use (rather than "global suspend"),
1605 * many devices will be individually taken out of suspend state using
54515fe5 1606 * special "resume" signaling. This routine kicks in shortly after
1da177e4
LT		 1607 * hardware resume signaling is finished, either because of selective
1608 * resume (by host) or remote wakeup (by device) ... now see what changed
1609 * in the tree that's rooted at this device.
54515fe5
AS		 1610 *
1611 * If @udev->reset_resume is set then the device is reset before the
1612 * status check is done.
1da177e4 1613 */
140d8f68 1614static int finish_port_resume(struct usb_device *udev)
1da177e4 1615{
54515fe5 1616 int status = 0;
1da177e4
LT		 1617 u16 devstatus;
1618
1619 /* caller owns the udev device lock */
54515fe5
AS		 1620 dev_dbg(&udev->dev, "finish %sresume\n",
1621 udev->reset_resume ? "reset-" : "");
1da177e4
LT		 1622
1623 /* usb ch9 identifies four variants of SUSPENDED, based on what
1624 * state the device resumes to. Linux currently won't see the
1625 * first two on the host side; they'd be inside hub_port_init()
1626 * during many timeouts, but khubd can't suspend until later.
1627 */
1628 usb_set_device_state(udev, udev->actconfig
1629 ? USB_STATE_CONFIGURED
1630 : USB_STATE_ADDRESS);
1da177e4 1631
54515fe5
AS		 1632 /* 10.5.4.5 says not to reset a suspended port if the attached
1633 * device is enabled for remote wakeup. Hence the reset
1634 * operation is carried out here, after the port has been
1635 * resumed.
1636 */
1637 if (udev->reset_resume)
1638 status = usb_reset_device(udev);
1639
1da177e4
LT		 1640 /* 10.5.4.5 says be sure devices in the tree are still there.
1641 * For now let's assume the device didn't go crazy on resume,
1642 * and device drivers will know about any resume quirks.
1643 */
54515fe5
AS		 1644 if (status == 0) {
1645 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1646 if (status >= 0)
1647 status = (status == 2 ? 0 : -ENODEV);
1648 }
b40b7a90 1649
624d6c07
AS		 1650 if (status) {
1651 dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
1652 status);
1653 } else if (udev->actconfig) {
1da177e4 1654 le16_to_cpus(&devstatus);
686314cf 1655 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
1da177e4
LT		 1656 status = usb_control_msg(udev,
1657 usb_sndctrlpipe(udev, 0),
1658 USB_REQ_CLEAR_FEATURE,
1659 USB_RECIP_DEVICE,
1660 USB_DEVICE_REMOTE_WAKEUP, 0,
1661 NULL, 0,
1662 USB_CTRL_SET_TIMEOUT);
a8e7c565 1663 if (status)
1da177e4
LT		 1664 dev_dbg(&udev->dev, "disable remote "
1665 "wakeup, status %d\n", status);
4bf0ba86 1666 }
1da177e4 1667 status = 0;
1da177e4
LT		 1668 }
1669 return status;
1670}
1671
624d6c07
AS		 1672/*
1673 * usb_port_resume - re-activate a suspended usb device's upstream port
1674 * @udev: device to re-activate, not a root hub
1675 * Context: must be able to sleep; device not locked; pm locks held
1676 *
1677 * This will re-activate the suspended device, increasing power usage
1678 * while letting drivers communicate again with its endpoints.
1679 * USB resume explicitly guarantees that the power session between
1680 * the host and the device is the same as it was when the device
1681 * suspended.
1682 *
54515fe5
AS		 1683 * If CONFIG_USB_PERSIST and @udev->reset_resume are both set then this
1684 * routine won't check that the port is still enabled. Furthermore,
1685 * if @udev->reset_resume is set then finish_port_resume() above will
1686 * reset @udev. The end result is that a broken power session can be
1687 * recovered and @udev will appear to persist across a loss of VBUS power.
1688 *
1689 * For example, if a host controller doesn't maintain VBUS suspend current
1690 * during a system sleep or is reset when the system wakes up, all the USB
1691 * power sessions below it will be broken. This is especially troublesome
1692 * for mass-storage devices containing mounted filesystems, since the
1693 * device will appear to have disconnected and all the memory mappings
1694 * to it will be lost. Using the USB_PERSIST facility, the device can be
1695 * made to appear as if it had not disconnected.
1696 *
1697 * This facility is inherently dangerous. Although usb_reset_device()
1698 * makes every effort to insure that the same device is present after the
1699 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
1700 * quite possible for a device to remain unaltered but its media to be
1701 * changed. If the user replaces a flash memory card while the system is
1702 * asleep, he will have only himself to blame when the filesystem on the
1703 * new card is corrupted and the system crashes.
1704 *
624d6c07
AS		 1705 * Returns 0 on success, else negative errno.
1706 */
1707int usb_port_resume(struct usb_device *udev)
1da177e4 1708{
624d6c07
AS		 1709 struct usb_hub *hub = hdev_to_hub(udev->parent);
1710 int port1 = udev->portnum;
1711 int status;
1712 u16 portchange, portstatus;
54515fe5 1713 unsigned mask_flags, want_flags;
d25450c6
AS		 1714
1715 /* Skip the initial Clear-Suspend step for a remote wakeup */
1716 status = hub_port_status(hub, port1, &portstatus, &portchange);
1717 if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
1718 goto SuspendCleared;
1da177e4
LT		 1719
1720 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1721
d5cbad4b
AS		 1722 set_bit(port1, hub->busy_bits);
1723
1da177e4
LT		 1724 /* see 7.1.7.7; affects power usage, but not budgeting */
1725 status = clear_port_feature(hub->hdev,
1726 port1, USB_PORT_FEAT_SUSPEND);
1727 if (status) {
624d6c07
AS		 1728 dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
1729 port1, status);
1da177e4 1730 } else {
1da177e4 1731 /* drive resume for at least 20 msec */
686314cf
AS		 1732 dev_dbg(&udev->dev, "usb %sresume\n",
1733 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1734 msleep(25);
1735
1da177e4
LT		 1736 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1737 * stop resume signaling. Then finish the resume
1738 * sequence.
1739 */
d25450c6 1740 status = hub_port_status(hub, port1, &portstatus, &portchange);
54515fe5
AS		 1741
1742 SuspendCleared:
1743 if (USB_PERSIST && udev->reset_resume)
1744 want_flags = USB_PORT_STAT_POWER
1745 | USB_PORT_STAT_CONNECTION;
1746 else
1747 want_flags = USB_PORT_STAT_POWER
1748 | USB_PORT_STAT_CONNECTION
1749 | USB_PORT_STAT_ENABLE;
1750 mask_flags = want_flags | USB_PORT_STAT_SUSPEND;
1751
1752 if (status < 0 || (portstatus & mask_flags) != want_flags) {
1da177e4
LT		 1753 dev_dbg(hub->intfdev,
1754 "port %d status %04x.%04x after resume, %d\n",
d25450c6 1755 port1, portchange, portstatus, status);
20307949
AS		 1756 if (status >= 0)
1757 status = -ENODEV;
1da177e4 1758 } else {
20307949
AS		 1759 if (portchange & USB_PORT_STAT_C_SUSPEND)
1760 clear_port_feature(hub->hdev, port1,
1761 USB_PORT_FEAT_C_SUSPEND);
1da177e4
LT		 1762 /* TRSMRCY = 10 msec */
1763 msleep(10);
1da177e4
LT		 1764 }
1765 }
1da177e4 1766
d5cbad4b
AS		 1767 clear_bit(port1, hub->busy_bits);
1768 if (!hub->hdev->parent && !hub->busy_bits[0])
1769 usb_enable_root_hub_irq(hub->hdev->bus);
1770
54515fe5
AS		 1771 if (status == 0)
1772 status = finish_port_resume(udev);
1773 if (status < 0) {
1774 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
1775 hub_port_logical_disconnect(hub, port1);
1776 }
1da177e4
LT		 1777 return status;
1778}
1779
1da177e4
LT		 1780static int remote_wakeup(struct usb_device *udev)
1781{
1782 int status = 0;
1783
9ad3d6cc 1784 usb_lock_device(udev);
1da177e4 1785 if (udev->state == USB_STATE_SUSPENDED) {
645daaab 1786 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
1941044a 1787 usb_mark_last_busy(udev);
6b157c9b 1788 status = usb_external_resume_device(udev);
1da177e4 1789 }
9ad3d6cc 1790 usb_unlock_device(udev);
1da177e4
LT		 1791 return status;
1792}
1793
d388dab7
AS		 1794#else /* CONFIG_USB_SUSPEND */
1795
1796/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1797
1798int usb_port_suspend(struct usb_device *udev)
1799{
1800 return 0;
1801}
1802
d388dab7
AS		 1803int usb_port_resume(struct usb_device *udev)
1804{
54515fe5
AS		 1805 int status = 0;
1806
1807 /* However we may need to do a reset-resume */
1808 if (udev->reset_resume) {
1809 dev_dbg(&udev->dev, "reset-resume\n");
1810 status = usb_reset_device(udev);
1811 }
1812 return status;
d388dab7
AS		 1813}
1814
1815static inline int remote_wakeup(struct usb_device *udev)
1816{
1817 return 0;
1818}
1819
1820#endif
1821
db690874 1822static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1da177e4
LT		 1823{
1824 struct usb_hub *hub = usb_get_intfdata (intf);
1825 struct usb_device *hdev = hub->hdev;
1826 unsigned port1;
1da177e4 1827
c9f89fa4 1828 /* fail if children aren't already suspended */
1da177e4
LT		 1829 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1830 struct usb_device *udev;
1831
1832 udev = hdev->children [port1-1];
114b368c 1833 if (udev && msg.event == PM_EVENT_SUSPEND &&
f3f3253d 1834#ifdef CONFIG_USB_SUSPEND
114b368c
AS		 1835 udev->state != USB_STATE_SUSPENDED
1836#else
1837 udev->dev.power.power_state.event
1838 == PM_EVENT_ON
f3f3253d 1839#endif
114b368c 1840 ) {
645daaab
AS		 1841 if (!hdev->auto_pm)
1842 dev_dbg(&intf->dev, "port %d nyet suspended\n",
1843 port1);
c9f89fa4
DB		 1844 return -EBUSY;
1845 }
1da177e4
LT		 1846 }
1847
40f122f3
AS		 1848 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1849
12f1ff83
AS		 1850 /* stop khubd and related activity */
1851 hub_quiesce(hub);
b6f6436d 1852 return 0;
1da177e4
LT		 1853}
1854
1855static int hub_resume(struct usb_interface *intf)
1856{
1da177e4 1857 struct usb_hub *hub = usb_get_intfdata (intf);
1da177e4 1858
40f122f3
AS		 1859 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1860
a8e7c565 1861 /* tell khubd to look for changes on this hub */
f3f3253d 1862 hub_activate(hub);
1da177e4
LT		 1863 return 0;
1864}
1865
b41a60ec 1866static int hub_reset_resume(struct usb_interface *intf)
f07600cf 1867{
b41a60ec 1868 struct usb_hub *hub = usb_get_intfdata(intf);
f07600cf
AS		 1869 struct usb_device *hdev = hub->hdev;
1870 int port1;
1871
b41a60ec
AS		 1872 hub_power_on(hub);
1873
f07600cf
AS		 1874 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
1875 struct usb_device *child = hdev->children[port1-1];
1876
1877 if (child) {
b41a60ec
AS		 1878
1879 /* For "USB_PERSIST"-enabled children we must
1880 * mark the child device for reset-resume and
1881 * turn off the connect-change status to prevent
1882 * khubd from disconnecting it later.
1883 */
1884 if (USB_PERSIST && child->persist_enabled) {
1885 child->reset_resume = 1;
1886 clear_port_feature(hdev, port1,
1887 USB_PORT_FEAT_C_CONNECTION);
1888
1889 /* Otherwise we must disconnect the child,
1890 * but as we may not lock the child device here
1891 * we have to do a "logical" disconnect.
1892 */
1893 } else {
1894 hub_port_logical_disconnect(hub, port1);
1895 }
f07600cf
AS		 1896 }
1897 }
f07600cf 1898
f07600cf
AS		 1899 hub_activate(hub);
1900 return 0;
1901}
1902
54515fe5
AS		 1903/**
1904 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1905 * @rhdev: struct usb_device for the root hub
1906 *
1907 * The USB host controller driver calls this function when its root hub
1908 * is resumed and Vbus power has been interrupted or the controller
1909 * has been reset. The routine marks @rhdev as having lost power. When
1910 * the hub driver is resumed it will take notice; if CONFIG_USB_PERSIST
1911 * is enabled then it will carry out power-session recovery, otherwise
1912 * it will disconnect all the child devices.
1913 */
1914void usb_root_hub_lost_power(struct usb_device *rhdev)
1915{
1916 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
1917 rhdev->reset_resume = 1;
1918}
1919EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1920
d388dab7
AS		 1921#else /* CONFIG_PM */
1922
1923static inline int remote_wakeup(struct usb_device *udev)
1924{
1925 return 0;
1926}
1927
f07600cf
AS		 1928#define hub_suspend NULL
1929#define hub_resume NULL
1930#define hub_reset_resume NULL
d388dab7
AS		 1931#endif
1932
1da177e4
LT		 1933
1934/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
1935 *
1936 * Between connect detection and reset signaling there must be a delay
1937 * of 100ms at least for debounce and power-settling. The corresponding
1938 * timer shall restart whenever the downstream port detects a disconnect.
1939 *
1940 * Apparently there are some bluetooth and irda-dongles and a number of
1941 * low-speed devices for which this debounce period may last over a second.
1942 * Not covered by the spec - but easy to deal with.
1943 *
1944 * This implementation uses a 1500ms total debounce timeout; if the
1945 * connection isn't stable by then it returns -ETIMEDOUT. It checks
1946 * every 25ms for transient disconnects. When the port status has been
1947 * unchanged for 100ms it returns the port status.
1948 */
1949
1950#define HUB_DEBOUNCE_TIMEOUT 1500
1951#define HUB_DEBOUNCE_STEP 25
1952#define HUB_DEBOUNCE_STABLE 100
1953
1954static int hub_port_debounce(struct usb_hub *hub, int port1)
1955{
1956 int ret;
1957 int total_time, stable_time = 0;
1958 u16 portchange, portstatus;
1959 unsigned connection = 0xffff;
1960
1961 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
1962 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1963 if (ret < 0)
1964 return ret;
1965
1966 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
1967 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
1968 stable_time += HUB_DEBOUNCE_STEP;
1969 if (stable_time >= HUB_DEBOUNCE_STABLE)
1970 break;
1971 } else {
1972 stable_time = 0;
1973 connection = portstatus & USB_PORT_STAT_CONNECTION;
1974 }
1975
1976 if (portchange & USB_PORT_STAT_C_CONNECTION) {
1977 clear_port_feature(hub->hdev, port1,
1978 USB_PORT_FEAT_C_CONNECTION);
1979 }
1980
1981 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
1982 break;
1983 msleep(HUB_DEBOUNCE_STEP);
1984 }
1985
1986 dev_dbg (hub->intfdev,
1987 "debounce: port %d: total %dms stable %dms status 0x%x\n",
1988 port1, total_time, stable_time, portstatus);
1989
1990 if (stable_time < HUB_DEBOUNCE_STABLE)
1991 return -ETIMEDOUT;
1992 return portstatus;
1993}
1994
1995static void ep0_reinit(struct usb_device *udev)
1996{
1997 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
1998 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
1999 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2000}
2001
2002#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2003#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2004
2005static int hub_set_address(struct usb_device *udev)
2006{
2007 int retval;
2008
2009 if (udev->devnum == 0)
2010 return -EINVAL;
2011 if (udev->state == USB_STATE_ADDRESS)
2012 return 0;
2013 if (udev->state != USB_STATE_DEFAULT)
2014 return -EINVAL;
2015 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2016 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2017 NULL, 0, USB_CTRL_SET_TIMEOUT);
2018 if (retval == 0) {
2019 usb_set_device_state(udev, USB_STATE_ADDRESS);
2020 ep0_reinit(udev);
2021 }
2022 return retval;
2023}
2024
2025/* Reset device, (re)assign address, get device descriptor.
2026 * Device connection must be stable, no more debouncing needed.
2027 * Returns device in USB_STATE_ADDRESS, except on error.
2028 *
2029 * If this is called for an already-existing device (as part of
2030 * usb_reset_device), the caller must own the device lock. For a
2031 * newly detected device that is not accessible through any global
2032 * pointers, it's not necessary to lock the device.
2033 */
2034static int
2035hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2036 int retry_counter)
2037{
4186ecf8 2038 static DEFINE_MUTEX(usb_address0_mutex);
1da177e4
LT		 2039
2040 struct usb_device *hdev = hub->hdev;
2041 int i, j, retval;
2042 unsigned delay = HUB_SHORT_RESET_TIME;
2043 enum usb_device_speed oldspeed = udev->speed;
83a07196 2044 char *speed, *type;
1da177e4
LT		 2045
2046 /* root hub ports have a slightly longer reset period
2047 * (from USB 2.0 spec, section 7.1.7.5)
2048 */
2049 if (!hdev->parent) {
2050 delay = HUB_ROOT_RESET_TIME;
2051 if (port1 == hdev->bus->otg_port)
2052 hdev->bus->b_hnp_enable = 0;
2053 }
2054
2055 /* Some low speed devices have problems with the quick delay, so */
2056 /* be a bit pessimistic with those devices. RHbug #23670 */
2057 if (oldspeed == USB_SPEED_LOW)
2058 delay = HUB_LONG_RESET_TIME;
2059
4186ecf8 2060 mutex_lock(&usb_address0_mutex);
1da177e4
LT		 2061
2062 /* Reset the device; full speed may morph to high speed */
2063 retval = hub_port_reset(hub, port1, udev, delay);
2064 if (retval < 0) /* error or disconnect */
2065 goto fail;
2066 /* success, speed is known */
2067 retval = -ENODEV;
2068
2069 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2070 dev_dbg(&udev->dev, "device reset changed speed!\n");
2071 goto fail;
2072 }
2073 oldspeed = udev->speed;
2074
2075 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2076 * it's fixed size except for full speed devices.
5bb6e0ae
IPG		 2077 * For Wireless USB devices, ep0 max packet is always 512 (tho
2078 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
1da177e4
LT		 2079 */
2080 switch (udev->speed) {
5bb6e0ae
IPG		 2081 case USB_SPEED_VARIABLE: /* fixed at 512 */
2082 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
2083 break;
1da177e4
LT		 2084 case USB_SPEED_HIGH: /* fixed at 64 */
2085 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2086 break;
2087 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2088 /* to determine the ep0 maxpacket size, try to read
2089 * the device descriptor to get bMaxPacketSize0 and
2090 * then correct our initial guess.
2091 */
2092 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2093 break;
2094 case USB_SPEED_LOW: /* fixed at 8 */
2095 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2096 break;
2097 default:
2098 goto fail;
2099 }
2100
83a07196
IPG		 2101 type = "";
2102 switch (udev->speed) {
2103 case USB_SPEED_LOW: speed = "low"; break;
2104 case USB_SPEED_FULL: speed = "full"; break;
2105 case USB_SPEED_HIGH: speed = "high"; break;
2106 case USB_SPEED_VARIABLE:
2107 speed = "variable";
2108 type = "Wireless ";
2109 break;
2110 default: speed = "?"; break;
2111 }
1da177e4 2112 dev_info (&udev->dev,
83a07196
IPG		 2113 "%s %s speed %sUSB device using %s and address %d\n",
2114 (udev->config) ? "reset" : "new", speed, type,
2115 udev->bus->controller->driver->name, udev->devnum);
1da177e4
LT		 2116
2117 /* Set up TT records, if needed */
2118 if (hdev->tt) {
2119 udev->tt = hdev->tt;
2120 udev->ttport = hdev->ttport;
2121 } else if (udev->speed != USB_SPEED_HIGH
2122 && hdev->speed == USB_SPEED_HIGH) {
2123 udev->tt = &hub->tt;
2124 udev->ttport = port1;
2125 }
2126
2127 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2128 * Because device hardware and firmware is sometimes buggy in
2129 * this area, and this is how Linux has done it for ages.
2130 * Change it cautiously.
2131 *
2132 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2133 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2134 * so it may help with some non-standards-compliant devices.
2135 * Otherwise we start with SET_ADDRESS and then try to read the
2136 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2137 * value.
2138 */
2139 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2140 if (USE_NEW_SCHEME(retry_counter)) {
2141 struct usb_device_descriptor *buf;
2142 int r = 0;
2143
2144#define GET_DESCRIPTOR_BUFSIZE 64
2145 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2146 if (!buf) {
2147 retval = -ENOMEM;
2148 continue;
2149 }
2150
b89ee19a
AS		 2151 /* Retry on all errors; some devices are flakey.
2152 * 255 is for WUSB devices, we actually need to use
2153 * 512 (WUSB1.0[4.8.1]).
1da177e4
LT		 2154 */
2155 for (j = 0; j < 3; ++j) {
2156 buf->bMaxPacketSize0 = 0;
2157 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2158 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2159 USB_DT_DEVICE << 8, 0,
2160 buf, GET_DESCRIPTOR_BUFSIZE,
b89ee19a 2161 USB_CTRL_GET_TIMEOUT);
1da177e4 2162 switch (buf->bMaxPacketSize0) {
5bb6e0ae 2163 case 8: case 16: case 32: case 64: case 255:
1da177e4
LT		 2164 if (buf->bDescriptorType ==
2165 USB_DT_DEVICE) {
2166 r = 0;
2167 break;
2168 }
2169 /* FALL THROUGH */
2170 default:
2171 if (r == 0)
2172 r = -EPROTO;
2173 break;
2174 }
2175 if (r == 0)
2176 break;
2177 }
2178 udev->descriptor.bMaxPacketSize0 =
2179 buf->bMaxPacketSize0;
2180 kfree(buf);
2181
2182 retval = hub_port_reset(hub, port1, udev, delay);
2183 if (retval < 0) /* error or disconnect */
2184 goto fail;
2185 if (oldspeed != udev->speed) {
2186 dev_dbg(&udev->dev,
2187 "device reset changed speed!\n");
2188 retval = -ENODEV;
2189 goto fail;
2190 }
2191 if (r) {
2192 dev_err(&udev->dev, "device descriptor "
2193 "read/%s, error %d\n",
2194 "64", r);
2195 retval = -EMSGSIZE;
2196 continue;
2197 }
2198#undef GET_DESCRIPTOR_BUFSIZE
2199 }
2200
2201 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2202 retval = hub_set_address(udev);
2203 if (retval >= 0)
2204 break;
2205 msleep(200);
2206 }
2207 if (retval < 0) {
2208 dev_err(&udev->dev,
2209 "device not accepting address %d, error %d\n",
2210 udev->devnum, retval);
2211 goto fail;
2212 }
2213
2214 /* cope with hardware quirkiness:
2215 * - let SET_ADDRESS settle, some device hardware wants it
2216 * - read ep0 maxpacket even for high and low speed,
2217 */
2218 msleep(10);
2219 if (USE_NEW_SCHEME(retry_counter))
2220 break;
2221
2222 retval = usb_get_device_descriptor(udev, 8);
2223 if (retval < 8) {
2224 dev_err(&udev->dev, "device descriptor "
2225 "read/%s, error %d\n",
2226 "8", retval);
2227 if (retval >= 0)
2228 retval = -EMSGSIZE;
2229 } else {
2230 retval = 0;
2231 break;
2232 }
2233 }
2234 if (retval)
2235 goto fail;
2236
5bb6e0ae
IPG		 2237 i = udev->descriptor.bMaxPacketSize0 == 0xff?
2238 512 : udev->descriptor.bMaxPacketSize0;
1da177e4
LT		 2239 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2240 if (udev->speed != USB_SPEED_FULL ||
2241 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2242 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2243 retval = -EMSGSIZE;
2244 goto fail;
2245 }
2246 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2247 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2248 ep0_reinit(udev);
2249 }
2250
2251 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2252 if (retval < (signed)sizeof(udev->descriptor)) {
2253 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2254 "all", retval);
2255 if (retval >= 0)
2256 retval = -ENOMSG;
2257 goto fail;
2258 }
2259
2260 retval = 0;
2261
2262fail:
2263 if (retval)
2264 hub_port_disable(hub, port1, 0);
4186ecf8 2265 mutex_unlock(&usb_address0_mutex);
1da177e4
LT		 2266 return retval;
2267}
2268
2269static void
2270check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2271{
2272 struct usb_qualifier_descriptor *qual;
2273 int status;
2274
e94b1766 2275 qual = kmalloc (sizeof *qual, GFP_KERNEL);
1da177e4
LT		 2276 if (qual == NULL)
2277 return;
2278
2279 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2280 qual, sizeof *qual);
2281 if (status == sizeof *qual) {
2282 dev_info(&udev->dev, "not running at top speed; "
2283 "connect to a high speed hub\n");
2284 /* hub LEDs are probably harder to miss than syslog */
2285 if (hub->has_indicators) {
2286 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
c4028958 2287 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2288 }
2289 }
1bc3c9e1 2290 kfree(qual);
1da177e4
LT		 2291}
2292
2293static unsigned
2294hub_power_remaining (struct usb_hub *hub)
2295{
2296 struct usb_device *hdev = hub->hdev;
2297 int remaining;
55c52718 2298 int port1;
1da177e4 2299
55c52718 2300 if (!hub->limited_power)
1da177e4
LT		 2301 return 0;
2302
55c52718
AS		 2303 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2304 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2305 struct usb_device *udev = hdev->children[port1 - 1];
2306 int delta;
1da177e4
LT		 2307
2308 if (!udev)
2309 continue;
2310
55c52718
AS		 2311 /* Unconfigured devices may not use more than 100mA,
2312 * or 8mA for OTG ports */
1da177e4 2313 if (udev->actconfig)
55c52718
AS		 2314 delta = udev->actconfig->desc.bMaxPower * 2;
2315 else if (port1 != udev->bus->otg_port || hdev->parent)
2316 delta = 100;
1da177e4 2317 else
55c52718
AS		 2318 delta = 8;
2319 if (delta > hub->mA_per_port)
2320 dev_warn(&udev->dev, "%dmA is over %umA budget "
2321 "for port %d!\n",
2322 delta, hub->mA_per_port, port1);
1da177e4
LT		 2323 remaining -= delta;
2324 }
2325 if (remaining < 0) {
55c52718
AS		 2326 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2327 - remaining);
1da177e4
LT		 2328 remaining = 0;
2329 }
2330 return remaining;
2331}
2332
2333/* Handle physical or logical connection change events.
2334 * This routine is called when:
2335 * a port connection-change occurs;
2336 * a port enable-change occurs (often caused by EMI);
2337 * usb_reset_device() encounters changed descriptors (as from
2338 * a firmware download)
2339 * caller already locked the hub
2340 */
2341static void hub_port_connect_change(struct usb_hub *hub, int port1,
2342 u16 portstatus, u16 portchange)
2343{
2344 struct usb_device *hdev = hub->hdev;
2345 struct device *hub_dev = hub->intfdev;
74ad9bd2 2346 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4
LT		 2347 int status, i;
2348
2349 dev_dbg (hub_dev,
2350 "port %d, status %04x, change %04x, %s\n",
2351 port1, portstatus, portchange, portspeed (portstatus));
2352
2353 if (hub->has_indicators) {
2354 set_port_led(hub, port1, HUB_LED_AUTO);
2355 hub->indicator[port1-1] = INDICATOR_AUTO;
2356 }
2357
2358 /* Disconnect any existing devices under this port */
2359 if (hdev->children[port1-1])
2360 usb_disconnect(&hdev->children[port1-1]);
2361 clear_bit(port1, hub->change_bits);
2362
2363#ifdef CONFIG_USB_OTG
2364 /* during HNP, don't repeat the debounce */
2365 if (hdev->bus->is_b_host)
2366 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2367#endif
2368
2369 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2370 status = hub_port_debounce(hub, port1);
d4b7d8e8
AS		 2371 if (status < 0) {
2372 if (printk_ratelimit())
2373 dev_err (hub_dev, "connect-debounce failed, "
2374 "port %d disabled\n", port1);
1da177e4
LT		 2375 goto done;
2376 }
2377 portstatus = status;
2378 }
2379
2380 /* Return now if nothing is connected */
2381 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2382
2383 /* maybe switch power back on (e.g. root hub was reset) */
74ad9bd2 2384 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
1da177e4
LT		 2385 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2386 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2387
2388 if (portstatus & USB_PORT_STAT_ENABLE)
2389 goto done;
2390 return;
2391 }
2392
1da177e4
LT		 2393 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2394 struct usb_device *udev;
2395
2396 /* reallocate for each attempt, since references
2397 * to the previous one can escape in various ways
2398 */
2399 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2400 if (!udev) {
2401 dev_err (hub_dev,
2402 "couldn't allocate port %d usb_device\n",
2403 port1);
2404 goto done;
2405 }
2406
2407 usb_set_device_state(udev, USB_STATE_POWERED);
2408 udev->speed = USB_SPEED_UNKNOWN;
55c52718 2409 udev->bus_mA = hub->mA_per_port;
b6956ffa 2410 udev->level = hdev->level + 1;
55c52718 2411
1da177e4
LT		 2412 /* set the address */
2413 choose_address(udev);
2414 if (udev->devnum <= 0) {
2415 status = -ENOTCONN; /* Don't retry */
2416 goto loop;
2417 }
2418
2419 /* reset and get descriptor */
2420 status = hub_port_init(hub, udev, port1, i);
2421 if (status < 0)
2422 goto loop;
2423
2424 /* consecutive bus-powered hubs aren't reliable; they can
2425 * violate the voltage drop budget. if the new child has
2426 * a "powered" LED, users should notice we didn't enable it
2427 * (without reading syslog), even without per-port LEDs
2428 * on the parent.
2429 */
2430 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
55c52718 2431 && udev->bus_mA <= 100) {
1da177e4
LT		 2432 u16 devstat;
2433
2434 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2435 &devstat);
55c52718 2436 if (status < 2) {
1da177e4
LT		 2437 dev_dbg(&udev->dev, "get status %d ?\n", status);
2438 goto loop_disable;
2439 }
55c52718 2440 le16_to_cpus(&devstat);
1da177e4
LT		 2441 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2442 dev_err(&udev->dev,
2443 "can't connect bus-powered hub "
2444 "to this port\n");
2445 if (hub->has_indicators) {
2446 hub->indicator[port1-1] =
2447 INDICATOR_AMBER_BLINK;
c4028958 2448 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2449 }
2450 status = -ENOTCONN; /* Don't retry */
2451 goto loop_disable;
2452 }
2453 }
2454
2455 /* check for devices running slower than they could */
2456 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2457 && udev->speed == USB_SPEED_FULL
2458 && highspeed_hubs != 0)
2459 check_highspeed (hub, udev, port1);
2460
2461 /* Store the parent's children[] pointer. At this point
2462 * udev becomes globally accessible, although presumably
2463 * no one will look at it until hdev is unlocked.
2464 */
1da177e4
LT		 2465 status = 0;
2466
2467 /* We mustn't add new devices if the parent hub has
2468 * been disconnected; we would race with the
2469 * recursively_mark_NOTATTACHED() routine.
2470 */
2471 spin_lock_irq(&device_state_lock);
2472 if (hdev->state == USB_STATE_NOTATTACHED)
2473 status = -ENOTCONN;
2474 else
2475 hdev->children[port1-1] = udev;
2476 spin_unlock_irq(&device_state_lock);
2477
2478 /* Run it through the hoops (find a driver, etc) */
2479 if (!status) {
2480 status = usb_new_device(udev);
2481 if (status) {
2482 spin_lock_irq(&device_state_lock);
2483 hdev->children[port1-1] = NULL;
2484 spin_unlock_irq(&device_state_lock);
2485 }
2486 }
2487
1da177e4
LT		 2488 if (status)
2489 goto loop_disable;
2490
2491 status = hub_power_remaining(hub);
2492 if (status)
55c52718 2493 dev_dbg(hub_dev, "%dmA power budget left\n", status);
1da177e4
LT		 2494
2495 return;
2496
2497loop_disable:
2498 hub_port_disable(hub, port1, 1);
2499loop:
2500 ep0_reinit(udev);
2501 release_address(udev);
2502 usb_put_dev(udev);
ffcdc18d 2503 if ((status == -ENOTCONN) || (status == -ENOTSUPP))
1da177e4
LT		 2504 break;
2505 }
2506
2507done:
2508 hub_port_disable(hub, port1, 1);
2509}
2510
2511static void hub_events(void)
2512{
2513 struct list_head *tmp;
2514 struct usb_device *hdev;
2515 struct usb_interface *intf;
2516 struct usb_hub *hub;
2517 struct device *hub_dev;
2518 u16 hubstatus;
2519 u16 hubchange;
2520 u16 portstatus;
2521 u16 portchange;
2522 int i, ret;
2523 int connect_change;
2524
2525 /*
2526 * We restart the list every time to avoid a deadlock with
2527 * deleting hubs downstream from this one. This should be
2528 * safe since we delete the hub from the event list.
2529 * Not the most efficient, but avoids deadlocks.
2530 */
2531 while (1) {
2532
2533 /* Grab the first entry at the beginning of the list */
2534 spin_lock_irq(&hub_event_lock);
2535 if (list_empty(&hub_event_list)) {
2536 spin_unlock_irq(&hub_event_lock);
2537 break;
2538 }
2539
2540 tmp = hub_event_list.next;
2541 list_del_init(tmp);
2542
2543 hub = list_entry(tmp, struct usb_hub, event_list);
e8054854
AS		 2544 kref_get(&hub->kref);
2545 spin_unlock_irq(&hub_event_lock);
1da177e4 2546
e8054854
AS		 2547 hdev = hub->hdev;
2548 hub_dev = hub->intfdev;
2549 intf = to_usb_interface(hub_dev);
40f122f3 2550 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
1da177e4
LT		 2551 hdev->state, hub->descriptor
2552 ? hub->descriptor->bNbrPorts
2553 : 0,
2554 /* NOTE: expects max 15 ports... */
2555 (u16) hub->change_bits[0],
40f122f3 2556 (u16) hub->event_bits[0]);
1da177e4 2557
1da177e4
LT		 2558 /* Lock the device, then check to see if we were
2559 * disconnected while waiting for the lock to succeed. */
06b84e8a 2560 usb_lock_device(hdev);
e8054854 2561 if (unlikely(hub->disconnected))
1da177e4
LT		 2562 goto loop;
2563
2564 /* If the hub has died, clean up after it */
2565 if (hdev->state == USB_STATE_NOTATTACHED) {
7de18d8b
AS		 2566 hub->error = -ENODEV;
2567 hub_pre_reset(intf);
1da177e4
LT		 2568 goto loop;
2569 }
2570
40f122f3
AS		 2571 /* Autoresume */
2572 ret = usb_autopm_get_interface(intf);
2573 if (ret) {
2574 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
2575 goto loop;
2576 }
a8e7c565 2577
40f122f3 2578 /* If this is an inactive hub, do nothing */
1da177e4 2579 if (hub->quiescing)
40f122f3 2580 goto loop_autopm;
1da177e4
LT		 2581
2582 if (hub->error) {
2583 dev_dbg (hub_dev, "resetting for error %d\n",
2584 hub->error);
2585
7de18d8b 2586 ret = usb_reset_composite_device(hdev, intf);
1da177e4
LT		 2587 if (ret) {
2588 dev_dbg (hub_dev,
2589 "error resetting hub: %d\n", ret);
40f122f3 2590 goto loop_autopm;
1da177e4
LT		 2591 }
2592
2593 hub->nerrors = 0;
2594 hub->error = 0;
2595 }
2596
2597 /* deal with port status changes */
2598 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2599 if (test_bit(i, hub->busy_bits))
2600 continue;
2601 connect_change = test_bit(i, hub->change_bits);
2602 if (!test_and_clear_bit(i, hub->event_bits) &&
2603 !connect_change && !hub->activating)
2604 continue;
2605
2606 ret = hub_port_status(hub, i,
2607 &portstatus, &portchange);
2608 if (ret < 0)
2609 continue;
2610
2611 if (hub->activating && !hdev->children[i-1] &&
2612 (portstatus &
2613 USB_PORT_STAT_CONNECTION))
2614 connect_change = 1;
2615
2616 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2617 clear_port_feature(hdev, i,
2618 USB_PORT_FEAT_C_CONNECTION);
2619 connect_change = 1;
2620 }
2621
2622 if (portchange & USB_PORT_STAT_C_ENABLE) {
2623 if (!connect_change)
2624 dev_dbg (hub_dev,
2625 "port %d enable change, "
2626 "status %08x\n",
2627 i, portstatus);
2628 clear_port_feature(hdev, i,
2629 USB_PORT_FEAT_C_ENABLE);
2630
2631 /*
2632 * EM interference sometimes causes badly
2633 * shielded USB devices to be shutdown by
2634 * the hub, this hack enables them again.
2635 * Works at least with mouse driver.
2636 */
2637 if (!(portstatus & USB_PORT_STAT_ENABLE)
2638 && !connect_change
2639 && hdev->children[i-1]) {
2640 dev_err (hub_dev,
2641 "port %i "
2642 "disabled by hub (EMI?), "
2643 "re-enabling...\n",
2644 i);
2645 connect_change = 1;
2646 }
2647 }
2648
2649 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2650 clear_port_feature(hdev, i,
2651 USB_PORT_FEAT_C_SUSPEND);
2652 if (hdev->children[i-1]) {
2653 ret = remote_wakeup(hdev->
2654 children[i-1]);
2655 if (ret < 0)
2656 connect_change = 1;
2657 } else {
2658 ret = -ENODEV;
2659 hub_port_disable(hub, i, 1);
2660 }
2661 dev_dbg (hub_dev,
2662 "resume on port %d, status %d\n",
2663 i, ret);
2664 }
2665
2666 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2667 dev_err (hub_dev,
2668 "over-current change on port %d\n",
2669 i);
2670 clear_port_feature(hdev, i,
2671 USB_PORT_FEAT_C_OVER_CURRENT);
2672 hub_power_on(hub);
2673 }
2674
2675 if (portchange & USB_PORT_STAT_C_RESET) {
2676 dev_dbg (hub_dev,
2677 "reset change on port %d\n",
2678 i);
2679 clear_port_feature(hdev, i,
2680 USB_PORT_FEAT_C_RESET);
2681 }
2682
2683 if (connect_change)
2684 hub_port_connect_change(hub, i,
2685 portstatus, portchange);
2686 } /* end for i */
2687
2688 /* deal with hub status changes */
2689 if (test_and_clear_bit(0, hub->event_bits) == 0)
2690 ; /* do nothing */
2691 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2692 dev_err (hub_dev, "get_hub_status failed\n");
2693 else {
2694 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2695 dev_dbg (hub_dev, "power change\n");
2696 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
55c52718
AS		 2697 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2698 /* FIXME: Is this always true? */
2699 hub->limited_power = 0;
2700 else
2701 hub->limited_power = 1;
1da177e4
LT		 2702 }
2703 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2704 dev_dbg (hub_dev, "overcurrent change\n");
2705 msleep(500); /* Cool down */
2706 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2707 hub_power_on(hub);
2708 }
2709 }
2710
2711 hub->activating = 0;
2712
d5926ae7
AS		 2713 /* If this is a root hub, tell the HCD it's okay to
2714 * re-enable port-change interrupts now. */
d5cbad4b 2715 if (!hdev->parent && !hub->busy_bits[0])
d5926ae7
AS		 2716 usb_enable_root_hub_irq(hdev->bus);
2717
40f122f3
AS		 2718loop_autopm:
2719 /* Allow autosuspend if we're not going to run again */
2720 if (list_empty(&hub->event_list))
2721 usb_autopm_enable(intf);
1da177e4
LT		 2722loop:
2723 usb_unlock_device(hdev);
e8054854 2724 kref_put(&hub->kref, hub_release);
1da177e4
LT		 2725
2726 } /* end while (1) */
2727}
2728
2729static int hub_thread(void *__unused)
2730{
1da177e4
LT		 2731 do {
2732 hub_events();
9c8d6178
AM		 2733 wait_event_interruptible(khubd_wait,
2734 !list_empty(&hub_event_list) ||
2735 kthread_should_stop());
3e1d1d28 2736 try_to_freeze();
9c8d6178 2737 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
1da177e4 2738
9c8d6178
AM		 2739 pr_debug("%s: khubd exiting\n", usbcore_name);
2740 return 0;
1da177e4
LT		 2741}
2742
2743static struct usb_device_id hub_id_table [] = {
2744 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2745 .bDeviceClass = USB_CLASS_HUB},
2746 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2747 .bInterfaceClass = USB_CLASS_HUB},
2748 { } /* Terminating entry */
2749};
2750
2751MODULE_DEVICE_TABLE (usb, hub_id_table);
2752
2753static struct usb_driver hub_driver = {
1da177e4
LT		 2754 .name = "hub",
2755 .probe = hub_probe,
2756 .disconnect = hub_disconnect,
2757 .suspend = hub_suspend,
2758 .resume = hub_resume,
f07600cf 2759 .reset_resume = hub_reset_resume,
7de18d8b
AS		 2760 .pre_reset = hub_pre_reset,
2761 .post_reset = hub_post_reset,
1da177e4
LT		 2762 .ioctl = hub_ioctl,
2763 .id_table = hub_id_table,
40f122f3 2764 .supports_autosuspend = 1,
1da177e4
LT		 2765};
2766
2767int usb_hub_init(void)
2768{
1da177e4
LT		 2769 if (usb_register(&hub_driver) < 0) {
2770 printk(KERN_ERR "%s: can't register hub driver\n",
2771 usbcore_name);
2772 return -1;
2773 }
2774
9c8d6178
AM		 2775 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2776 if (!IS_ERR(khubd_task))
1da177e4 2777 return 0;
1da177e4
LT		 2778
2779 /* Fall through if kernel_thread failed */
2780 usb_deregister(&hub_driver);
2781 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2782
2783 return -1;
2784}
2785
2786void usb_hub_cleanup(void)
2787{
9c8d6178 2788 kthread_stop(khubd_task);
1da177e4
LT		 2789
2790 /*
2791 * Hub resources are freed for us by usb_deregister. It calls
2792 * usb_driver_purge on every device which in turn calls that
2793 * devices disconnect function if it is using this driver.
2794 * The hub_disconnect function takes care of releasing the
2795 * individual hub resources. -greg
2796 */
2797 usb_deregister(&hub_driver);
2798} /* usb_hub_cleanup() */
2799
1da177e4
LT		 2800static int config_descriptors_changed(struct usb_device *udev)
2801{
2802 unsigned index;
2803 unsigned len = 0;
2804 struct usb_config_descriptor *buf;
2805
2806 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2807 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2808 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2809 }
e94b1766 2810 buf = kmalloc (len, GFP_KERNEL);
1da177e4
LT		 2811 if (buf == NULL) {
2812 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2813 /* assume the worst */
2814 return 1;
2815 }
2816 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2817 int length;
2818 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2819
2820 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2821 old_length);
2822 if (length < old_length) {
2823 dev_dbg(&udev->dev, "config index %d, error %d\n",
2824 index, length);
2825 break;
2826 }
2827 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2828 != 0) {
2829 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2830 index, buf->bConfigurationValue);
2831 break;
2832 }
2833 }
2834 kfree(buf);
2835 return index != udev->descriptor.bNumConfigurations;
2836}
2837
2838/**
2839 * usb_reset_device - perform a USB port reset to reinitialize a device
2840 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2841 *
79efa097
AS		 2842 * WARNING - don't use this routine to reset a composite device
2843 * (one with multiple interfaces owned by separate drivers)!
2844 * Use usb_reset_composite_device() instead.
1da177e4
LT		 2845 *
2846 * Do a port reset, reassign the device's address, and establish its
2847 * former operating configuration. If the reset fails, or the device's
2848 * descriptors change from their values before the reset, or the original
2849 * configuration and altsettings cannot be restored, a flag will be set
2850 * telling khubd to pretend the device has been disconnected and then
2851 * re-connected. All drivers will be unbound, and the device will be
2852 * re-enumerated and probed all over again.
2853 *
2854 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2855 * flagged for logical disconnection, or some other negative error code
2856 * if the reset wasn't even attempted.
2857 *
2858 * The caller must own the device lock. For example, it's safe to use
2859 * this from a driver probe() routine after downloading new firmware.
2860 * For calls that might not occur during probe(), drivers should lock
2861 * the device using usb_lock_device_for_reset().
6bc6cff5
AS		 2862 *
2863 * Locking exception: This routine may also be called from within an
2864 * autoresume handler. Such usage won't conflict with other tasks
2865 * holding the device lock because these tasks should always call
2866 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
1da177e4
LT		 2867 */
2868int usb_reset_device(struct usb_device *udev)
2869{
2870 struct usb_device *parent_hdev = udev->parent;
2871 struct usb_hub *parent_hub;
2872 struct usb_device_descriptor descriptor = udev->descriptor;
12c3da34
AS		 2873 int i, ret = 0;
2874 int port1 = udev->portnum;
1da177e4
LT		 2875
2876 if (udev->state == USB_STATE_NOTATTACHED ||
2877 udev->state == USB_STATE_SUSPENDED) {
2878 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2879 udev->state);
2880 return -EINVAL;
2881 }
2882
2883 if (!parent_hdev) {
2884 /* this requires hcd-specific logic; see OHCI hc_restart() */
2885 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2886 return -EISDIR;
2887 }
1da177e4
LT		 2888 parent_hub = hdev_to_hub(parent_hdev);
2889
1da177e4
LT		 2890 set_bit(port1, parent_hub->busy_bits);
2891 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2892
2893 /* ep0 maxpacket size may change; let the HCD know about it.
2894 * Other endpoints will be handled by re-enumeration. */
2895 ep0_reinit(udev);
2896 ret = hub_port_init(parent_hub, udev, port1, i);
dd4dd19e 2897 if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
1da177e4
LT		 2898 break;
2899 }
2900 clear_bit(port1, parent_hub->busy_bits);
d5cbad4b
AS		 2901 if (!parent_hdev->parent && !parent_hub->busy_bits[0])
2902 usb_enable_root_hub_irq(parent_hdev->bus);
2903
1da177e4
LT		 2904 if (ret < 0)
2905 goto re_enumerate;
2906
2907 /* Device might have changed firmware (DFU or similar) */
2908 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
2909 || config_descriptors_changed (udev)) {
2910 dev_info(&udev->dev, "device firmware changed\n");
2911 udev->descriptor = descriptor; /* for disconnect() calls */
2912 goto re_enumerate;
2913 }
2914
2915 if (!udev->actconfig)
2916 goto done;
2917
2918 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2919 USB_REQ_SET_CONFIGURATION, 0,
2920 udev->actconfig->desc.bConfigurationValue, 0,
2921 NULL, 0, USB_CTRL_SET_TIMEOUT);
2922 if (ret < 0) {
2923 dev_err(&udev->dev,
2924 "can't restore configuration #%d (error=%d)\n",
2925 udev->actconfig->desc.bConfigurationValue, ret);
2926 goto re_enumerate;
2927 }
2928 usb_set_device_state(udev, USB_STATE_CONFIGURED);
2929
2930 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
2931 struct usb_interface *intf = udev->actconfig->interface[i];
2932 struct usb_interface_descriptor *desc;
2933
2934 /* set_interface resets host side toggle even
2935 * for altsetting zero. the interface may have no driver.
2936 */
2937 desc = &intf->cur_altsetting->desc;
2938 ret = usb_set_interface(udev, desc->bInterfaceNumber,
2939 desc->bAlternateSetting);
2940 if (ret < 0) {
2941 dev_err(&udev->dev, "failed to restore interface %d "
2942 "altsetting %d (error=%d)\n",
2943 desc->bInterfaceNumber,
2944 desc->bAlternateSetting,
2945 ret);
2946 goto re_enumerate;
2947 }
2948 }
2949
2950done:
1da177e4
LT		 2951 return 0;
2952
2953re_enumerate:
2954 hub_port_logical_disconnect(parent_hub, port1);
2955 return -ENODEV;
2956}
140d8f68 2957EXPORT_SYMBOL(usb_reset_device);
79efa097
AS		 2958
2959/**
2960 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
2961 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2962 * @iface: interface bound to the driver making the request (optional)
2963 *
2964 * Warns all drivers bound to registered interfaces (using their pre_reset
2965 * method), performs the port reset, and then lets the drivers know that
2966 * the reset is over (using their post_reset method).
2967 *
2968 * Return value is the same as for usb_reset_device().
2969 *
2970 * The caller must own the device lock. For example, it's safe to use
2971 * this from a driver probe() routine after downloading new firmware.
2972 * For calls that might not occur during probe(), drivers should lock
2973 * the device using usb_lock_device_for_reset().
2974 *
2975 * The interface locks are acquired during the pre_reset stage and released
2976 * during the post_reset stage. However if iface is not NULL and is
2977 * currently being probed, we assume that the caller already owns its
2978 * lock.
2979 */
2980int usb_reset_composite_device(struct usb_device *udev,
2981 struct usb_interface *iface)
2982{
2983 int ret;
2984 struct usb_host_config *config = udev->actconfig;
2985
2986 if (udev->state == USB_STATE_NOTATTACHED ||
2987 udev->state == USB_STATE_SUSPENDED) {
2988 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2989 udev->state);
2990 return -EINVAL;
2991 }
2992
645daaab 2993 /* Prevent autosuspend during the reset */
94fcda1f 2994 usb_autoresume_device(udev);
645daaab 2995
79efa097
AS		 2996 if (iface && iface->condition != USB_INTERFACE_BINDING)
2997 iface = NULL;
2998
2999 if (config) {
3000 int i;
3001 struct usb_interface *cintf;
3002 struct usb_driver *drv;
3003
3004 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3005 cintf = config->interface[i];
3006 if (cintf != iface)
3007 down(&cintf->dev.sem);
3008 if (device_is_registered(&cintf->dev) &&
3009 cintf->dev.driver) {
3010 drv = to_usb_driver(cintf->dev.driver);
3011 if (drv->pre_reset)
3012 (drv->pre_reset)(cintf);
f07600cf 3013 /* FIXME: Unbind if pre_reset returns an error or isn't defined */
79efa097
AS		 3014 }
3015 }
3016 }
3017
3018 ret = usb_reset_device(udev);
3019
3020 if (config) {
3021 int i;
3022 struct usb_interface *cintf;
3023 struct usb_driver *drv;
3024
3025 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3026 cintf = config->interface[i];
3027 if (device_is_registered(&cintf->dev) &&
3028 cintf->dev.driver) {
3029 drv = to_usb_driver(cintf->dev.driver);
3030 if (drv->post_reset)
f07600cf
AS		 3031 (drv->post_reset)(cintf);
3032 /* FIXME: Unbind if post_reset returns an error or isn't defined */
79efa097
AS		 3033 }
3034 if (cintf != iface)
3035 up(&cintf->dev.sem);
3036 }
3037 }
3038
94fcda1f 3039 usb_autosuspend_device(udev);
79efa097
AS		 3040 return ret;
3041}
140d8f68 3042EXPORT_SYMBOL(usb_reset_composite_device);
kernel source for telekom puls (alcatel/mediatek)