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[PATCH] remove suspend-path recursion
[net-next-2.6.git] / drivers / usb / core / hub.c
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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
11#include <linux/config.h>
12#ifdef CONFIG_USB_DEBUG
13 #define DEBUG
14#else
15 #undef DEBUG
16#endif
17#include <linux/kernel.h>
18#include <linux/errno.h>
19#include <linux/module.h>
20#include <linux/moduleparam.h>
21#include <linux/completion.h>
22#include <linux/sched.h>
23#include <linux/list.h>
24#include <linux/slab.h>
25#include <linux/smp_lock.h>
26#include <linux/ioctl.h>
27#include <linux/usb.h>
28#include <linux/usbdevice_fs.h>
9c8d6178 29#include <linux/kthread.h>
1da177e4
LT		 30
31#include <asm/semaphore.h>
32#include <asm/uaccess.h>
33#include <asm/byteorder.h>
34
35#include "usb.h"
36#include "hcd.h"
37#include "hub.h"
38
39/* Protect struct usb_device->state and ->children members
40 * Note: Both are also protected by ->serialize, except that ->state can
41 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
42static DEFINE_SPINLOCK(device_state_lock);
43
44/* khubd's worklist and its lock */
45static DEFINE_SPINLOCK(hub_event_lock);
46static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
47
48/* Wakes up khubd */
49static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
50
9c8d6178 51static struct task_struct *khubd_task;
1da177e4
LT		 52
53/* cycle leds on hubs that aren't blinking for attention */
54static int blinkenlights = 0;
55module_param (blinkenlights, bool, S_IRUGO);
56MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
57
58/*
59 * As of 2.6.10 we introduce a new USB device initialization scheme which
60 * closely resembles the way Windows works. Hopefully it will be compatible
61 * with a wider range of devices than the old scheme. However some previously
62 * working devices may start giving rise to "device not accepting address"
63 * errors; if that happens the user can try the old scheme by adjusting the
64 * following module parameters.
65 *
66 * For maximum flexibility there are two boolean parameters to control the
67 * hub driver's behavior. On the first initialization attempt, if the
68 * "old_scheme_first" parameter is set then the old scheme will be used,
69 * otherwise the new scheme is used. If that fails and "use_both_schemes"
70 * is set, then the driver will make another attempt, using the other scheme.
71 */
72static int old_scheme_first = 0;
73module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
74MODULE_PARM_DESC(old_scheme_first,
75 "start with the old device initialization scheme");
76
77static int use_both_schemes = 1;
78module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
79MODULE_PARM_DESC(use_both_schemes,
80 "try the other device initialization scheme if the "
81 "first one fails");
82
83
84#ifdef DEBUG
85static inline char *portspeed (int portstatus)
86{
87 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
88 return "480 Mb/s";
89 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
90 return "1.5 Mb/s";
91 else
92 return "12 Mb/s";
93}
94#endif
95
96/* Note that hdev or one of its children must be locked! */
97static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
98{
99 return usb_get_intfdata(hdev->actconfig->interface[0]);
100}
101
102/* USB 2.0 spec Section 11.24.4.5 */
103static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
104{
105 int i, ret;
106
107 for (i = 0; i < 3; i++) {
108 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
109 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
110 USB_DT_HUB << 8, 0, data, size,
111 USB_CTRL_GET_TIMEOUT);
112 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
113 return ret;
114 }
115 return -EINVAL;
116}
117
118/*
119 * USB 2.0 spec Section 11.24.2.1
120 */
121static int clear_hub_feature(struct usb_device *hdev, int feature)
122{
123 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
124 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
125}
126
127/*
128 * USB 2.0 spec Section 11.24.2.2
129 */
130static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
131{
132 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
133 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
134 NULL, 0, 1000);
135}
136
137/*
138 * USB 2.0 spec Section 11.24.2.13
139 */
140static int set_port_feature(struct usb_device *hdev, int port1, int feature)
141{
142 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
143 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
144 NULL, 0, 1000);
145}
146
147/*
148 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
149 * for info about using port indicators
150 */
151static void set_port_led(
152 struct usb_hub *hub,
153 int port1,
154 int selector
155)
156{
157 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
158 USB_PORT_FEAT_INDICATOR);
159 if (status < 0)
160 dev_dbg (hub->intfdev,
161 "port %d indicator %s status %d\n",
162 port1,
163 ({ char *s; switch (selector) {
164 case HUB_LED_AMBER: s = "amber"; break;
165 case HUB_LED_GREEN: s = "green"; break;
166 case HUB_LED_OFF: s = "off"; break;
167 case HUB_LED_AUTO: s = "auto"; break;
168 default: s = "??"; break;
169 }; s; }),
170 status);
171}
172
173#define LED_CYCLE_PERIOD ((2*HZ)/3)
174
175static void led_work (void *__hub)
176{
177 struct usb_hub *hub = __hub;
178 struct usb_device *hdev = hub->hdev;
179 unsigned i;
180 unsigned changed = 0;
181 int cursor = -1;
182
183 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
184 return;
185
186 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
187 unsigned selector, mode;
188
189 /* 30%-50% duty cycle */
190
191 switch (hub->indicator[i]) {
192 /* cycle marker */
193 case INDICATOR_CYCLE:
194 cursor = i;
195 selector = HUB_LED_AUTO;
196 mode = INDICATOR_AUTO;
197 break;
198 /* blinking green = sw attention */
199 case INDICATOR_GREEN_BLINK:
200 selector = HUB_LED_GREEN;
201 mode = INDICATOR_GREEN_BLINK_OFF;
202 break;
203 case INDICATOR_GREEN_BLINK_OFF:
204 selector = HUB_LED_OFF;
205 mode = INDICATOR_GREEN_BLINK;
206 break;
207 /* blinking amber = hw attention */
208 case INDICATOR_AMBER_BLINK:
209 selector = HUB_LED_AMBER;
210 mode = INDICATOR_AMBER_BLINK_OFF;
211 break;
212 case INDICATOR_AMBER_BLINK_OFF:
213 selector = HUB_LED_OFF;
214 mode = INDICATOR_AMBER_BLINK;
215 break;
216 /* blink green/amber = reserved */
217 case INDICATOR_ALT_BLINK:
218 selector = HUB_LED_GREEN;
219 mode = INDICATOR_ALT_BLINK_OFF;
220 break;
221 case INDICATOR_ALT_BLINK_OFF:
222 selector = HUB_LED_AMBER;
223 mode = INDICATOR_ALT_BLINK;
224 break;
225 default:
226 continue;
227 }
228 if (selector != HUB_LED_AUTO)
229 changed = 1;
230 set_port_led(hub, i + 1, selector);
231 hub->indicator[i] = mode;
232 }
233 if (!changed && blinkenlights) {
234 cursor++;
235 cursor %= hub->descriptor->bNbrPorts;
236 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
237 hub->indicator[cursor] = INDICATOR_CYCLE;
238 changed++;
239 }
240 if (changed)
241 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
242}
243
244/* use a short timeout for hub/port status fetches */
245#define USB_STS_TIMEOUT 1000
246#define USB_STS_RETRIES 5
247
248/*
249 * USB 2.0 spec Section 11.24.2.6
250 */
251static int get_hub_status(struct usb_device *hdev,
252 struct usb_hub_status *data)
253{
254 int i, status = -ETIMEDOUT;
255
256 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
257 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
258 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
259 data, sizeof(*data), USB_STS_TIMEOUT);
260 }
261 return status;
262}
263
264/*
265 * USB 2.0 spec Section 11.24.2.7
266 */
267static int get_port_status(struct usb_device *hdev, int port1,
268 struct usb_port_status *data)
269{
270 int i, status = -ETIMEDOUT;
271
272 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
273 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
274 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
275 data, sizeof(*data), USB_STS_TIMEOUT);
276 }
277 return status;
278}
279
280static void kick_khubd(struct usb_hub *hub)
281{
282 unsigned long flags;
283
284 spin_lock_irqsave(&hub_event_lock, flags);
285 if (list_empty(&hub->event_list)) {
286 list_add_tail(&hub->event_list, &hub_event_list);
287 wake_up(&khubd_wait);
288 }
289 spin_unlock_irqrestore(&hub_event_lock, flags);
290}
291
292void usb_kick_khubd(struct usb_device *hdev)
293{
294 kick_khubd(hdev_to_hub(hdev));
295}
296
297
298/* completion function, fires on port status changes and various faults */
299static void hub_irq(struct urb *urb, struct pt_regs *regs)
300{
301 struct usb_hub *hub = (struct usb_hub *)urb->context;
302 int status;
303 int i;
304 unsigned long bits;
305
306 switch (urb->status) {
307 case -ENOENT: /* synchronous unlink */
308 case -ECONNRESET: /* async unlink */
309 case -ESHUTDOWN: /* hardware going away */
310 return;
311
312 default: /* presumably an error */
313 /* Cause a hub reset after 10 consecutive errors */
314 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
315 if ((++hub->nerrors < 10) || hub->error)
316 goto resubmit;
317 hub->error = urb->status;
318 /* FALL THROUGH */
319
320 /* let khubd handle things */
321 case 0: /* we got data: port status changed */
322 bits = 0;
323 for (i = 0; i < urb->actual_length; ++i)
324 bits |= ((unsigned long) ((*hub->buffer)[i]))
325 << (i*8);
326 hub->event_bits[0] = bits;
327 break;
328 }
329
330 hub->nerrors = 0;
331
332 /* Something happened, let khubd figure it out */
333 kick_khubd(hub);
334
335resubmit:
336 if (hub->quiescing)
337 return;
338
339 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
340 && status != -ENODEV && status != -EPERM)
341 dev_err (hub->intfdev, "resubmit --> %d\n", status);
342}
343
344/* USB 2.0 spec Section 11.24.2.3 */
345static inline int
346hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
347{
348 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
349 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
350 tt, NULL, 0, 1000);
351}
352
353/*
354 * enumeration blocks khubd for a long time. we use keventd instead, since
355 * long blocking there is the exception, not the rule. accordingly, HCDs
356 * talking to TTs must queue control transfers (not just bulk and iso), so
357 * both can talk to the same hub concurrently.
358 */
359static void hub_tt_kevent (void *arg)
360{
361 struct usb_hub *hub = arg;
362 unsigned long flags;
363
364 spin_lock_irqsave (&hub->tt.lock, flags);
365 while (!list_empty (&hub->tt.clear_list)) {
366 struct list_head *temp;
367 struct usb_tt_clear *clear;
368 struct usb_device *hdev = hub->hdev;
369 int status;
370
371 temp = hub->tt.clear_list.next;
372 clear = list_entry (temp, struct usb_tt_clear, clear_list);
373 list_del (&clear->clear_list);
374
375 /* drop lock so HCD can concurrently report other TT errors */
376 spin_unlock_irqrestore (&hub->tt.lock, flags);
377 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
378 spin_lock_irqsave (&hub->tt.lock, flags);
379
380 if (status)
381 dev_err (&hdev->dev,
382 "clear tt %d (%04x) error %d\n",
383 clear->tt, clear->devinfo, status);
1bc3c9e1 384 kfree(clear);
1da177e4
LT		 385 }
386 spin_unlock_irqrestore (&hub->tt.lock, flags);
387}
388
389/**
390 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
391 * @udev: the device whose split transaction failed
392 * @pipe: identifies the endpoint of the failed transaction
393 *
394 * High speed HCDs use this to tell the hub driver that some split control or
395 * bulk transaction failed in a way that requires clearing internal state of
396 * a transaction translator. This is normally detected (and reported) from
397 * interrupt context.
398 *
399 * It may not be possible for that hub to handle additional full (or low)
400 * speed transactions until that state is fully cleared out.
401 */
402void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
403{
404 struct usb_tt *tt = udev->tt;
405 unsigned long flags;
406 struct usb_tt_clear *clear;
407
408 /* we've got to cope with an arbitrary number of pending TT clears,
409 * since each TT has "at least two" buffers that can need it (and
410 * there can be many TTs per hub). even if they're uncommon.
411 */
412 if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) {
413 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
414 /* FIXME recover somehow ... RESET_TT? */
415 return;
416 }
417
418 /* info that CLEAR_TT_BUFFER needs */
419 clear->tt = tt->multi ? udev->ttport : 1;
420 clear->devinfo = usb_pipeendpoint (pipe);
421 clear->devinfo |= udev->devnum << 4;
422 clear->devinfo |= usb_pipecontrol (pipe)
423 ? (USB_ENDPOINT_XFER_CONTROL << 11)
424 : (USB_ENDPOINT_XFER_BULK << 11);
425 if (usb_pipein (pipe))
426 clear->devinfo |= 1 << 15;
427
428 /* tell keventd to clear state for this TT */
429 spin_lock_irqsave (&tt->lock, flags);
430 list_add_tail (&clear->clear_list, &tt->clear_list);
431 schedule_work (&tt->kevent);
432 spin_unlock_irqrestore (&tt->lock, flags);
433}
434
435static void hub_power_on(struct usb_hub *hub)
436{
437 int port1;
b789696a 438 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
1da177e4
LT		 439
440 /* if hub supports power switching, enable power on each port */
441 if ((hub->descriptor->wHubCharacteristics & HUB_CHAR_LPSM) < 2) {
442 dev_dbg(hub->intfdev, "enabling power on all ports\n");
443 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
444 set_port_feature(hub->hdev, port1,
445 USB_PORT_FEAT_POWER);
446 }
447
b789696a
DB		 448 /* Wait at least 100 msec for power to become stable */
449 msleep(max(pgood_delay, (unsigned) 100));
1da177e4
LT		 450}
451
452static void hub_quiesce(struct usb_hub *hub)
453{
454 /* stop khubd and related activity */
455 hub->quiescing = 1;
c9f89fa4 456 hub->activating = 0;
1da177e4
LT		 457 usb_kill_urb(hub->urb);
458 if (hub->has_indicators)
459 cancel_delayed_work(&hub->leds);
460 if (hub->has_indicators || hub->tt.hub)
461 flush_scheduled_work();
462}
463
464static void hub_activate(struct usb_hub *hub)
465{
466 int status;
467
468 hub->quiescing = 0;
469 hub->activating = 1;
470 status = usb_submit_urb(hub->urb, GFP_NOIO);
471 if (status < 0)
472 dev_err(hub->intfdev, "activate --> %d\n", status);
473 if (hub->has_indicators && blinkenlights)
474 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
475
476 /* scan all ports ASAP */
477 kick_khubd(hub);
478}
479
480static int hub_hub_status(struct usb_hub *hub,
481 u16 *status, u16 *change)
482{
483 int ret;
484
485 ret = get_hub_status(hub->hdev, &hub->status->hub);
486 if (ret < 0)
487 dev_err (hub->intfdev,
488 "%s failed (err = %d)\n", __FUNCTION__, ret);
489 else {
490 *status = le16_to_cpu(hub->status->hub.wHubStatus);
491 *change = le16_to_cpu(hub->status->hub.wHubChange);
492 ret = 0;
493 }
494 return ret;
495}
496
8b28c752
AS		 497static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
498{
499 struct usb_device *hdev = hub->hdev;
500 int ret;
501
502 if (hdev->children[port1-1] && set_state) {
503 usb_set_device_state(hdev->children[port1-1],
504 USB_STATE_NOTATTACHED);
505 }
506 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
507 if (ret)
508 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
509 port1, ret);
510
511 return ret;
512}
513
1da177e4
LT		 514static int hub_configure(struct usb_hub *hub,
515 struct usb_endpoint_descriptor *endpoint)
516{
517 struct usb_device *hdev = hub->hdev;
518 struct device *hub_dev = hub->intfdev;
519 u16 hubstatus, hubchange;
520 unsigned int pipe;
521 int maxp, ret;
522 char *message;
523
524 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
525 &hub->buffer_dma);
526 if (!hub->buffer) {
527 message = "can't allocate hub irq buffer";
528 ret = -ENOMEM;
529 goto fail;
530 }
531
532 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
533 if (!hub->status) {
534 message = "can't kmalloc hub status buffer";
535 ret = -ENOMEM;
536 goto fail;
537 }
538
539 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
540 if (!hub->descriptor) {
541 message = "can't kmalloc hub descriptor";
542 ret = -ENOMEM;
543 goto fail;
544 }
545
546 /* Request the entire hub descriptor.
547 * hub->descriptor can handle USB_MAXCHILDREN ports,
548 * but the hub can/will return fewer bytes here.
549 */
550 ret = get_hub_descriptor(hdev, hub->descriptor,
551 sizeof(*hub->descriptor));
552 if (ret < 0) {
553 message = "can't read hub descriptor";
554 goto fail;
555 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
556 message = "hub has too many ports!";
557 ret = -ENODEV;
558 goto fail;
559 }
560
561 hdev->maxchild = hub->descriptor->bNbrPorts;
562 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
563 (hdev->maxchild == 1) ? "" : "s");
564
565 le16_to_cpus(&hub->descriptor->wHubCharacteristics);
566
567 if (hub->descriptor->wHubCharacteristics & HUB_CHAR_COMPOUND) {
568 int i;
569 char portstr [USB_MAXCHILDREN + 1];
570
571 for (i = 0; i < hdev->maxchild; i++)
572 portstr[i] = hub->descriptor->DeviceRemovable
573 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
574 ? 'F' : 'R';
575 portstr[hdev->maxchild] = 0;
576 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
577 } else
578 dev_dbg(hub_dev, "standalone hub\n");
579
580 switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_LPSM) {
581 case 0x00:
582 dev_dbg(hub_dev, "ganged power switching\n");
583 break;
584 case 0x01:
585 dev_dbg(hub_dev, "individual port power switching\n");
586 break;
587 case 0x02:
588 case 0x03:
589 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
590 break;
591 }
592
593 switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_OCPM) {
594 case 0x00:
595 dev_dbg(hub_dev, "global over-current protection\n");
596 break;
597 case 0x08:
598 dev_dbg(hub_dev, "individual port over-current protection\n");
599 break;
600 case 0x10:
601 case 0x18:
602 dev_dbg(hub_dev, "no over-current protection\n");
603 break;
604 }
605
606 spin_lock_init (&hub->tt.lock);
607 INIT_LIST_HEAD (&hub->tt.clear_list);
608 INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
609 switch (hdev->descriptor.bDeviceProtocol) {
610 case 0:
611 break;
612 case 1:
613 dev_dbg(hub_dev, "Single TT\n");
614 hub->tt.hub = hdev;
615 break;
616 case 2:
617 ret = usb_set_interface(hdev, 0, 1);
618 if (ret == 0) {
619 dev_dbg(hub_dev, "TT per port\n");
620 hub->tt.multi = 1;
621 } else
622 dev_err(hub_dev, "Using single TT (err %d)\n",
623 ret);
624 hub->tt.hub = hdev;
625 break;
626 default:
627 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
628 hdev->descriptor.bDeviceProtocol);
629 break;
630 }
631
e09711ae 632 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
1da177e4 633 switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_TTTT) {
e09711ae
DB		 634 case HUB_TTTT_8_BITS:
635 if (hdev->descriptor.bDeviceProtocol != 0) {
636 hub->tt.think_time = 666;
637 dev_dbg(hub_dev, "TT requires at most %d "
638 "FS bit times (%d ns)\n",
639 8, hub->tt.think_time);
640 }
1da177e4 641 break;
e09711ae
DB		 642 case HUB_TTTT_16_BITS:
643 hub->tt.think_time = 666 * 2;
644 dev_dbg(hub_dev, "TT requires at most %d "
645 "FS bit times (%d ns)\n",
646 16, hub->tt.think_time);
1da177e4 647 break;
e09711ae
DB		 648 case HUB_TTTT_24_BITS:
649 hub->tt.think_time = 666 * 3;
650 dev_dbg(hub_dev, "TT requires at most %d "
651 "FS bit times (%d ns)\n",
652 24, hub->tt.think_time);
1da177e4 653 break;
e09711ae
DB		 654 case HUB_TTTT_32_BITS:
655 hub->tt.think_time = 666 * 4;
656 dev_dbg(hub_dev, "TT requires at most %d "
657 "FS bit times (%d ns)\n",
658 32, hub->tt.think_time);
1da177e4
LT		 659 break;
660 }
661
662 /* probe() zeroes hub->indicator[] */
663 if (hub->descriptor->wHubCharacteristics & HUB_CHAR_PORTIND) {
664 hub->has_indicators = 1;
665 dev_dbg(hub_dev, "Port indicators are supported\n");
666 }
667
668 dev_dbg(hub_dev, "power on to power good time: %dms\n",
669 hub->descriptor->bPwrOn2PwrGood * 2);
670
671 /* power budgeting mostly matters with bus-powered hubs,
672 * and battery-powered root hubs (may provide just 8 mA).
673 */
674 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
675 if (ret < 0) {
676 message = "can't get hub status";
677 goto fail;
678 }
7d35b929
AS		 679 le16_to_cpus(&hubstatus);
680 if (hdev == hdev->bus->root_hub) {
681 struct usb_hcd *hcd =
682 container_of(hdev->bus, struct usb_hcd, self);
683
684 hub->power_budget = min(500u, hcd->power_budget) / 2;
685 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1da177e4
LT		 686 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
687 hub->descriptor->bHubContrCurrent);
688 hub->power_budget = (501 - hub->descriptor->bHubContrCurrent)
689 / 2;
7d35b929
AS		 690 }
691 if (hub->power_budget)
1da177e4
LT		 692 dev_dbg(hub_dev, "%dmA bus power budget for children\n",
693 hub->power_budget * 2);
1da177e4
LT		 694
695
696 ret = hub_hub_status(hub, &hubstatus, &hubchange);
697 if (ret < 0) {
698 message = "can't get hub status";
699 goto fail;
700 }
701
702 /* local power status reports aren't always correct */
703 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
704 dev_dbg(hub_dev, "local power source is %s\n",
705 (hubstatus & HUB_STATUS_LOCAL_POWER)
706 ? "lost (inactive)" : "good");
707
708 if ((hub->descriptor->wHubCharacteristics & HUB_CHAR_OCPM) == 0)
709 dev_dbg(hub_dev, "%sover-current condition exists\n",
710 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
711
712 /* set up the interrupt endpoint */
713 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
714 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
715
716 if (maxp > sizeof(*hub->buffer))
717 maxp = sizeof(*hub->buffer);
718
719 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
720 if (!hub->urb) {
721 message = "couldn't allocate interrupt urb";
722 ret = -ENOMEM;
723 goto fail;
724 }
725
726 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
727 hub, endpoint->bInterval);
728 hub->urb->transfer_dma = hub->buffer_dma;
729 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
730
731 /* maybe cycle the hub leds */
732 if (hub->has_indicators && blinkenlights)
733 hub->indicator [0] = INDICATOR_CYCLE;
734
735 hub_power_on(hub);
736 hub_activate(hub);
737 return 0;
738
739fail:
740 dev_err (hub_dev, "config failed, %s (err %d)\n",
741 message, ret);
742 /* hub_disconnect() frees urb and descriptor */
743 return ret;
744}
745
746static unsigned highspeed_hubs;
747
bf193d3c
AS		 748/* Called after the hub driver is unbound from a hub with children */
749static void hub_remove_children_work(void *__hub)
750{
751 struct usb_hub *hub = __hub;
752 struct usb_device *hdev = hub->hdev;
753 int i;
754
755 kfree(hub);
756
757 usb_lock_device(hdev);
758 for (i = 0; i < hdev->maxchild; ++i) {
759 if (hdev->children[i])
760 usb_disconnect(&hdev->children[i]);
761 }
762 usb_unlock_device(hdev);
763 usb_put_dev(hdev);
764}
765
1da177e4
LT		 766static void hub_disconnect(struct usb_interface *intf)
767{
768 struct usb_hub *hub = usb_get_intfdata (intf);
769 struct usb_device *hdev;
bf193d3c 770 int n, port1;
1da177e4 771
8b28c752 772 usb_set_intfdata (intf, NULL);
1da177e4
LT		 773 hdev = hub->hdev;
774
775 if (hdev->speed == USB_SPEED_HIGH)
776 highspeed_hubs--;
777
1da177e4
LT		 778 hub_quiesce(hub);
779 usb_free_urb(hub->urb);
780 hub->urb = NULL;
781
782 spin_lock_irq(&hub_event_lock);
783 list_del_init(&hub->event_list);
784 spin_unlock_irq(&hub_event_lock);
785
1bc3c9e1
JJ		 786 kfree(hub->descriptor);
787 hub->descriptor = NULL;
1da177e4 788
1bc3c9e1
JJ		 789 kfree(hub->status);
790 hub->status = NULL;
1da177e4
LT		 791
792 if (hub->buffer) {
793 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
794 hub->buffer_dma);
795 hub->buffer = NULL;
796 }
797
bf193d3c
AS		 798 /* If there are any children then this is an unbind only, not a
799 * physical disconnection. The active ports must be disabled
800 * and later on we must call usb_disconnect(). We can't call
801 * it now because we may not hold the hub's device lock.
802 */
803 n = 0;
804 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
805 if (hdev->children[port1 - 1]) {
806 ++n;
807 hub_port_disable(hub, port1, 1);
808 }
809 }
810
811 if (n == 0)
812 kfree(hub);
813 else {
814 /* Reuse the hub->leds work_struct for our own purposes */
815 INIT_WORK(&hub->leds, hub_remove_children_work, hub);
816 schedule_work(&hub->leds);
817 usb_get_dev(hdev);
818 }
1da177e4
LT		 819}
820
821static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
822{
823 struct usb_host_interface *desc;
824 struct usb_endpoint_descriptor *endpoint;
825 struct usb_device *hdev;
826 struct usb_hub *hub;
827
828 desc = intf->cur_altsetting;
829 hdev = interface_to_usbdev(intf);
830
831 /* Some hubs have a subclass of 1, which AFAICT according to the */
832 /* specs is not defined, but it works */
833 if ((desc->desc.bInterfaceSubClass != 0) &&
834 (desc->desc.bInterfaceSubClass != 1)) {
835descriptor_error:
836 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
837 return -EIO;
838 }
839
840 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
841 if (desc->desc.bNumEndpoints != 1)
842 goto descriptor_error;
843
844 endpoint = &desc->endpoint[0].desc;
845
846 /* Output endpoint? Curiouser and curiouser.. */
847 if (!(endpoint->bEndpointAddress & USB_DIR_IN))
848 goto descriptor_error;
849
850 /* If it's not an interrupt endpoint, we'd better punt! */
851 if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
852 != USB_ENDPOINT_XFER_INT)
853 goto descriptor_error;
854
855 /* We found a hub */
856 dev_info (&intf->dev, "USB hub found\n");
857
858 hub = kmalloc(sizeof(*hub), GFP_KERNEL);
859 if (!hub) {
860 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
861 return -ENOMEM;
862 }
863
864 memset(hub, 0, sizeof(*hub));
865
866 INIT_LIST_HEAD(&hub->event_list);
867 hub->intfdev = &intf->dev;
868 hub->hdev = hdev;
869 INIT_WORK(&hub->leds, led_work, hub);
870
871 usb_set_intfdata (intf, hub);
872
873 if (hdev->speed == USB_SPEED_HIGH)
874 highspeed_hubs++;
875
876 if (hub_configure(hub, endpoint) >= 0)
877 return 0;
878
879 hub_disconnect (intf);
880 return -ENODEV;
881}
882
883static int
884hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
885{
886 struct usb_device *hdev = interface_to_usbdev (intf);
887
888 /* assert ifno == 0 (part of hub spec) */
889 switch (code) {
890 case USBDEVFS_HUB_PORTINFO: {
891 struct usbdevfs_hub_portinfo *info = user_data;
892 int i;
893
894 spin_lock_irq(&device_state_lock);
895 if (hdev->devnum <= 0)
896 info->nports = 0;
897 else {
898 info->nports = hdev->maxchild;
899 for (i = 0; i < info->nports; i++) {
900 if (hdev->children[i] == NULL)
901 info->port[i] = 0;
902 else
903 info->port[i] =
904 hdev->children[i]->devnum;
905 }
906 }
907 spin_unlock_irq(&device_state_lock);
908
909 return info->nports + 1;
910 }
911
912 default:
913 return -ENOSYS;
914 }
915}
916
917/* caller has locked the hub device */
918static void hub_pre_reset(struct usb_hub *hub)
919{
920 struct usb_device *hdev = hub->hdev;
921 int i;
922
923 for (i = 0; i < hdev->maxchild; ++i) {
924 if (hdev->children[i])
925 usb_disconnect(&hdev->children[i]);
926 }
927 hub_quiesce(hub);
928}
929
930/* caller has locked the hub device */
931static void hub_post_reset(struct usb_hub *hub)
932{
933 hub_activate(hub);
934 hub_power_on(hub);
935}
936
937
938/* grab device/port lock, returning index of that port (zero based).
939 * protects the upstream link used by this device from concurrent
940 * tree operations like suspend, resume, reset, and disconnect, which
941 * apply to everything downstream of a given port.
942 */
943static int locktree(struct usb_device *udev)
944{
945 int t;
946 struct usb_device *hdev;
947
948 if (!udev)
949 return -ENODEV;
950
951 /* root hub is always the first lock in the series */
952 hdev = udev->parent;
953 if (!hdev) {
954 usb_lock_device(udev);
955 return 0;
956 }
957
958 /* on the path from root to us, lock everything from
959 * top down, dropping parent locks when not needed
960 */
961 t = locktree(hdev);
962 if (t < 0)
963 return t;
964 for (t = 0; t < hdev->maxchild; t++) {
965 if (hdev->children[t] == udev) {
966 /* everything is fail-fast once disconnect
967 * processing starts
968 */
969 if (udev->state == USB_STATE_NOTATTACHED)
970 break;
971
972 /* when everyone grabs locks top->bottom,
973 * non-overlapping work may be concurrent
974 */
975 down(&udev->serialize);
976 up(&hdev->serialize);
977 return t + 1;
978 }
979 }
980 usb_unlock_device(hdev);
981 return -ENODEV;
982}
983
984static void recursively_mark_NOTATTACHED(struct usb_device *udev)
985{
986 int i;
987
988 for (i = 0; i < udev->maxchild; ++i) {
989 if (udev->children[i])
990 recursively_mark_NOTATTACHED(udev->children[i]);
991 }
992 udev->state = USB_STATE_NOTATTACHED;
993}
994
995/**
996 * usb_set_device_state - change a device's current state (usbcore, hcds)
997 * @udev: pointer to device whose state should be changed
998 * @new_state: new state value to be stored
999 *
1000 * udev->state is _not_ fully protected by the device lock. Although
1001 * most transitions are made only while holding the lock, the state can
1002 * can change to USB_STATE_NOTATTACHED at almost any time. This
1003 * is so that devices can be marked as disconnected as soon as possible,
1004 * without having to wait for any semaphores to be released. As a result,
1005 * all changes to any device's state must be protected by the
1006 * device_state_lock spinlock.
1007 *
1008 * Once a device has been added to the device tree, all changes to its state
1009 * should be made using this routine. The state should _not_ be set directly.
1010 *
1011 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1012 * Otherwise udev->state is set to new_state, and if new_state is
1013 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1014 * to USB_STATE_NOTATTACHED.
1015 */
1016void usb_set_device_state(struct usb_device *udev,
1017 enum usb_device_state new_state)
1018{
1019 unsigned long flags;
1020
1021 spin_lock_irqsave(&device_state_lock, flags);
1022 if (udev->state == USB_STATE_NOTATTACHED)
1023 ; /* do nothing */
b94dc6b5 1024 else if (new_state != USB_STATE_NOTATTACHED) {
1da177e4 1025 udev->state = new_state;
b94dc6b5
DB		 1026 if (new_state == USB_STATE_CONFIGURED)
1027 device_init_wakeup(&udev->dev,
1028 (udev->actconfig->desc.bmAttributes
1029 & USB_CONFIG_ATT_WAKEUP));
1030 else if (new_state != USB_STATE_SUSPENDED)
1031 device_init_wakeup(&udev->dev, 0);
1032 } else
1da177e4
LT		 1033 recursively_mark_NOTATTACHED(udev);
1034 spin_unlock_irqrestore(&device_state_lock, flags);
1035}
1036EXPORT_SYMBOL(usb_set_device_state);
1037
1038
1039static void choose_address(struct usb_device *udev)
1040{
1041 int devnum;
1042 struct usb_bus *bus = udev->bus;
1043
1044 /* If khubd ever becomes multithreaded, this will need a lock */
1045
1046 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1047 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1048 bus->devnum_next);
1049 if (devnum >= 128)
1050 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1051
1052 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1053
1054 if (devnum < 128) {
1055 set_bit(devnum, bus->devmap.devicemap);
1056 udev->devnum = devnum;
1057 }
1058}
1059
1060static void release_address(struct usb_device *udev)
1061{
1062 if (udev->devnum > 0) {
1063 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1064 udev->devnum = -1;
1065 }
1066}
1067
1068/**
1069 * usb_disconnect - disconnect a device (usbcore-internal)
1070 * @pdev: pointer to device being disconnected
1071 * Context: !in_interrupt ()
1072 *
1073 * Something got disconnected. Get rid of it and all of its children.
1074 *
1075 * If *pdev is a normal device then the parent hub must already be locked.
1076 * If *pdev is a root hub then this routine will acquire the
1077 * usb_bus_list_lock on behalf of the caller.
1078 *
1079 * Only hub drivers (including virtual root hub drivers for host
1080 * controllers) should ever call this.
1081 *
1082 * This call is synchronous, and may not be used in an interrupt context.
1083 */
1084void usb_disconnect(struct usb_device **pdev)
1085{
1086 struct usb_device *udev = *pdev;
1087 int i;
1088
1089 if (!udev) {
1090 pr_debug ("%s nodev\n", __FUNCTION__);
1091 return;
1092 }
1093
1094 /* mark the device as inactive, so any further urb submissions for
1095 * this device (and any of its children) will fail immediately.
1096 * this quiesces everyting except pending urbs.
1097 */
1098 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1099
1100 /* lock the bus list on behalf of HCDs unregistering their root hubs */
1101 if (!udev->parent) {
1102 down(&usb_bus_list_lock);
1103 usb_lock_device(udev);
1104 } else
1105 down(&udev->serialize);
1106
1107 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1108
1109 /* Free up all the children before we remove this device */
1110 for (i = 0; i < USB_MAXCHILDREN; i++) {
1111 if (udev->children[i])
1112 usb_disconnect(&udev->children[i]);
1113 }
1114
1115 /* deallocate hcd/hardware state ... nuking all pending urbs and
1116 * cleaning up all state associated with the current configuration
1117 * so that the hardware is now fully quiesced.
1118 */
1119 usb_disable_device(udev, 0);
1120
1121 /* Free the device number, remove the /proc/bus/usb entry and
1122 * the sysfs attributes, and delete the parent's children[]
1123 * (or root_hub) pointer.
1124 */
1125 dev_dbg (&udev->dev, "unregistering device\n");
1126 release_address(udev);
1127 usbfs_remove_device(udev);
fbf82fd2 1128 usbdev_remove(udev);
1da177e4
LT		 1129 usb_remove_sysfs_dev_files(udev);
1130
1131 /* Avoid races with recursively_mark_NOTATTACHED() */
1132 spin_lock_irq(&device_state_lock);
1133 *pdev = NULL;
1134 spin_unlock_irq(&device_state_lock);
1135
1136 if (!udev->parent) {
1137 usb_unlock_device(udev);
1138 up(&usb_bus_list_lock);
1139 } else
1140 up(&udev->serialize);
1141
1142 device_unregister(&udev->dev);
1143}
1144
1145static int choose_configuration(struct usb_device *udev)
1146{
1147 int c, i;
1148
1149 /* NOTE: this should interact with hub power budgeting */
1150
1151 c = udev->config[0].desc.bConfigurationValue;
1152 if (udev->descriptor.bNumConfigurations != 1) {
1153 for (i = 0; i < udev->descriptor.bNumConfigurations; i++) {
1154 struct usb_interface_descriptor *desc;
1155
1156 /* heuristic: Linux is more likely to have class
1157 * drivers, so avoid vendor-specific interfaces.
1158 */
1159 desc = &udev->config[i].intf_cache[0]
1160 ->altsetting->desc;
1161 if (desc->bInterfaceClass == USB_CLASS_VENDOR_SPEC)
1162 continue;
1163 /* COMM/2/all is CDC ACM, except 0xff is MSFT RNDIS.
1164 * MSFT needs this to be the first config; never use
1165 * it as the default unless Linux has host-side RNDIS.
1166 * A second config would ideally be CDC-Ethernet, but
1167 * may instead be the "vendor specific" CDC subset
1168 * long used by ARM Linux for sa1100 or pxa255.
1169 */
1170 if (desc->bInterfaceClass == USB_CLASS_COMM
1171 && desc->bInterfaceSubClass == 2
1172 && desc->bInterfaceProtocol == 0xff) {
1173 c = udev->config[1].desc.bConfigurationValue;
1174 continue;
1175 }
1176 c = udev->config[i].desc.bConfigurationValue;
1177 break;
1178 }
1179 dev_info(&udev->dev,
1180 "configuration #%d chosen from %d choices\n",
1181 c, udev->descriptor.bNumConfigurations);
1182 }
1183 return c;
1184}
1185
1186#ifdef DEBUG
1187static void show_string(struct usb_device *udev, char *id, char *string)
1188{
1189 if (!string)
1190 return;
1191 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1192}
1193
1194#else
1195static inline void show_string(struct usb_device *udev, char *id, char *string)
1196{}
1197#endif
1198
1199static void get_string(struct usb_device *udev, char **string, int index)
1200{
1201 char *buf;
1202
1203 if (!index)
1204 return;
1205 buf = kmalloc(256, GFP_KERNEL);
1206 if (!buf)
1207 return;
1208 if (usb_string(udev, index, buf, 256) > 0)
1209 *string = buf;
1210 else
1211 kfree(buf);
1212}
1213
1214
1215#ifdef CONFIG_USB_OTG
1216#include "otg_whitelist.h"
1217#endif
1218
1219/**
1220 * usb_new_device - perform initial device setup (usbcore-internal)
1221 * @udev: newly addressed device (in ADDRESS state)
1222 *
1223 * This is called with devices which have been enumerated, but not yet
1224 * configured. The device descriptor is available, but not descriptors
1225 * for any device configuration. The caller must have locked udev and
1226 * either the parent hub (if udev is a normal device) or else the
1227 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1228 * udev has already been installed, but udev is not yet visible through
1229 * sysfs or other filesystem code.
1230 *
1231 * Returns 0 for success (device is configured and listed, with its
1232 * interfaces, in sysfs); else a negative errno value.
1233 *
1234 * This call is synchronous, and may not be used in an interrupt context.
1235 *
1236 * Only the hub driver should ever call this; root hub registration
1237 * uses it indirectly.
1238 */
1239int usb_new_device(struct usb_device *udev)
1240{
1241 int err;
1242 int c;
1243
1244 err = usb_get_configuration(udev);
1245 if (err < 0) {
1246 dev_err(&udev->dev, "can't read configurations, error %d\n",
1247 err);
1248 goto fail;
1249 }
1250
1251 /* read the standard strings and cache them if present */
1252 get_string(udev, &udev->product, udev->descriptor.iProduct);
1253 get_string(udev, &udev->manufacturer, udev->descriptor.iManufacturer);
1254 get_string(udev, &udev->serial, udev->descriptor.iSerialNumber);
1255
1256 /* Tell the world! */
1257 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1258 "SerialNumber=%d\n",
1259 udev->descriptor.iManufacturer,
1260 udev->descriptor.iProduct,
1261 udev->descriptor.iSerialNumber);
1262 show_string(udev, "Product", udev->product);
1263 show_string(udev, "Manufacturer", udev->manufacturer);
1264 show_string(udev, "SerialNumber", udev->serial);
1265
1266#ifdef CONFIG_USB_OTG
1267 /*
1268 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1269 * to wake us after we've powered off VBUS; and HNP, switching roles
1270 * "host" to "peripheral". The OTG descriptor helps figure this out.
1271 */
1272 if (!udev->bus->is_b_host
1273 && udev->config
1274 && udev->parent == udev->bus->root_hub) {
1275 struct usb_otg_descriptor *desc = 0;
1276 struct usb_bus *bus = udev->bus;
1277
1278 /* descriptor may appear anywhere in config */
1279 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1280 le16_to_cpu(udev->config[0].desc.wTotalLength),
1281 USB_DT_OTG, (void **) &desc) == 0) {
1282 if (desc->bmAttributes & USB_OTG_HNP) {
1283 unsigned port1;
1284 struct usb_device *root = udev->parent;
1285
1286 for (port1 = 1; port1 <= root->maxchild;
1287 port1++) {
1288 if (root->children[port1-1] == udev)
1289 break;
1290 }
1291
1292 dev_info(&udev->dev,
1293 "Dual-Role OTG device on %sHNP port\n",
1294 (port1 == bus->otg_port)
1295 ? "" : "non-");
1296
1297 /* enable HNP before suspend, it's simpler */
1298 if (port1 == bus->otg_port)
1299 bus->b_hnp_enable = 1;
1300 err = usb_control_msg(udev,
1301 usb_sndctrlpipe(udev, 0),
1302 USB_REQ_SET_FEATURE, 0,
1303 bus->b_hnp_enable
1304 ? USB_DEVICE_B_HNP_ENABLE
1305 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1306 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1307 if (err < 0) {
1308 /* OTG MESSAGE: report errors here,
1309 * customize to match your product.
1310 */
1311 dev_info(&udev->dev,
1312 "can't set HNP mode; %d\n",
1313 err);
1314 bus->b_hnp_enable = 0;
1315 }
1316 }
1317 }
1318 }
1319
1320 if (!is_targeted(udev)) {
1321
1322 /* Maybe it can talk to us, though we can't talk to it.
1323 * (Includes HNP test device.)
1324 */
1325 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1326 static int __usb_suspend_device (struct usb_device *,
1327 int port1, pm_message_t state);
1328 err = __usb_suspend_device(udev,
1329 udev->bus->otg_port,
1330 PMSG_SUSPEND);
1331 if (err < 0)
1332 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1333 }
1334 err = -ENODEV;
1335 goto fail;
1336 }
1337#endif
1338
1339 /* put device-specific files into sysfs */
1340 err = device_add (&udev->dev);
1341 if (err) {
1342 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1343 goto fail;
1344 }
1345 usb_create_sysfs_dev_files (udev);
1346
1347 /* choose and set the configuration. that registers the interfaces
1348 * with the driver core, and lets usb device drivers bind to them.
1349 */
1350 c = choose_configuration(udev);
1351 if (c < 0)
1352 dev_warn(&udev->dev,
1353 "can't choose an initial configuration\n");
1354 else {
1355 err = usb_set_configuration(udev, c);
1356 if (err) {
1357 dev_err(&udev->dev, "can't set config #%d, error %d\n",
1358 c, err);
1359 usb_remove_sysfs_dev_files(udev);
1360 device_del(&udev->dev);
1361 goto fail;
1362 }
1363 }
1364
1365 /* USB device state == configured ... usable */
1366
1367 /* add a /proc/bus/usb entry */
fbf82fd2 1368 usbdev_add(udev);
1da177e4
LT		 1369 usbfs_add_device(udev);
1370 return 0;
1371
1372fail:
1373 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1374 return err;
1375}
1376
1377
1378static int hub_port_status(struct usb_hub *hub, int port1,
1379 u16 *status, u16 *change)
1380{
1381 int ret;
1382
1383 ret = get_port_status(hub->hdev, port1, &hub->status->port);
1384 if (ret < 0)
1385 dev_err (hub->intfdev,
1386 "%s failed (err = %d)\n", __FUNCTION__, ret);
1387 else {
1388 *status = le16_to_cpu(hub->status->port.wPortStatus);
1389 *change = le16_to_cpu(hub->status->port.wPortChange);
1390 ret = 0;
1391 }
1392 return ret;
1393}
1394
1395#define PORT_RESET_TRIES 5
1396#define SET_ADDRESS_TRIES 2
1397#define GET_DESCRIPTOR_TRIES 2
1398#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1399#define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1400
1401#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1402#define HUB_SHORT_RESET_TIME 10
1403#define HUB_LONG_RESET_TIME 200
1404#define HUB_RESET_TIMEOUT 500
1405
1406static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1407 struct usb_device *udev, unsigned int delay)
1408{
1409 int delay_time, ret;
1410 u16 portstatus;
1411 u16 portchange;
1412
1413 for (delay_time = 0;
1414 delay_time < HUB_RESET_TIMEOUT;
1415 delay_time += delay) {
1416 /* wait to give the device a chance to reset */
1417 msleep(delay);
1418
1419 /* read and decode port status */
1420 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1421 if (ret < 0)
1422 return ret;
1423
1424 /* Device went away? */
1425 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1426 return -ENOTCONN;
1427
1428 /* bomb out completely if something weird happened */
1429 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1430 return -EINVAL;
1431
1432 /* if we`ve finished resetting, then break out of the loop */
1433 if (!(portstatus & USB_PORT_STAT_RESET) &&
1434 (portstatus & USB_PORT_STAT_ENABLE)) {
1435 if (portstatus & USB_PORT_STAT_HIGH_SPEED)
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
1da177e4
LT		 1507/*
1508 * Disable a port and mark a logical connnect-change event, so that some
1509 * time later khubd will disconnect() any existing usb_device on the port
1510 * and will re-enumerate if there actually is a device attached.
1511 */
1512static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1513{
1514 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1515 hub_port_disable(hub, port1, 1);
1516
1517 /* FIXME let caller ask to power down the port:
1518 * - some devices won't enumerate without a VBUS power cycle
1519 * - SRP saves power that way
ba9d35fb 1520 * - usb_suspend_device(dev, PMSG_SUSPEND)
1da177e4
LT		 1521 * That's easy if this hub can switch power per-port, and
1522 * khubd reactivates the port later (timer, SRP, etc).
1523 * Powerdown must be optional, because of reset/DFU.
1524 */
1525
1526 set_bit(port1, hub->change_bits);
1527 kick_khubd(hub);
1528}
1529
1530
1531#ifdef CONFIG_USB_SUSPEND
1532
1533/*
1534 * Selective port suspend reduces power; most suspended devices draw
1535 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1536 * All devices below the suspended port are also suspended.
1537 *
1538 * Devices leave suspend state when the host wakes them up. Some devices
1539 * also support "remote wakeup", where the device can activate the USB
1540 * tree above them to deliver data, such as a keypress or packet. In
1541 * some cases, this wakes the USB host.
1542 */
1543static int hub_port_suspend(struct usb_hub *hub, int port1,
1544 struct usb_device *udev)
1545{
1546 int status;
1547
1548 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1549
1550 /* enable remote wakeup when appropriate; this lets the device
1551 * wake up the upstream hub (including maybe the root hub).
1552 *
1553 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1554 * we don't explicitly enable it here.
1555 */
b94dc6b5 1556 if (device_may_wakeup(&udev->dev)) {
1da177e4
LT		 1557 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1558 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1559 USB_DEVICE_REMOTE_WAKEUP, 0,
1560 NULL, 0,
1561 USB_CTRL_SET_TIMEOUT);
1562 if (status)
1563 dev_dbg(&udev->dev,
1564 "won't remote wakeup, status %d\n",
1565 status);
1566 }
1567
1568 /* see 7.1.7.6 */
1569 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1570 if (status) {
1571 dev_dbg(hub->intfdev,
1572 "can't suspend port %d, status %d\n",
1573 port1, status);
1574 /* paranoia: "should not happen" */
1575 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1576 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1577 USB_DEVICE_REMOTE_WAKEUP, 0,
1578 NULL, 0,
1579 USB_CTRL_SET_TIMEOUT);
1580 } else {
1581 /* device has up to 10 msec to fully suspend */
1582 dev_dbg(&udev->dev, "usb suspend\n");
1583 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1584 msleep(10);
1585 }
1586 return status;
1587}
1588
1589/*
1590 * Devices on USB hub ports have only one "suspend" state, corresponding
ba9d35fb 1591 * to ACPI D2, "may cause the device to lose some context".
1da177e4
LT		 1592 * State transitions include:
1593 *
1594 * - suspend, resume ... when the VBUS power link stays live
1595 * - suspend, disconnect ... VBUS lost
1596 *
1597 * Once VBUS drop breaks the circuit, the port it's using has to go through
1598 * normal re-enumeration procedures, starting with enabling VBUS power.
1599 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1600 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1601 * timer, no SRP, no requests through sysfs.
1602 */
1603static int __usb_suspend_device (struct usb_device *udev, int port1,
1604 pm_message_t state)
1605{
1606 int status;
1607
1608 /* caller owns the udev device lock */
1609 if (port1 < 0)
1610 return port1;
1611
1612 if (udev->state == USB_STATE_SUSPENDED
1613 || udev->state == USB_STATE_NOTATTACHED) {
1614 return 0;
1615 }
1616
c9f89fa4 1617 /* all interfaces must already be suspended */
1da177e4
LT		 1618 if (udev->actconfig) {
1619 int i;
1620
1621 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1622 struct usb_interface *intf;
1da177e4
LT		 1623
1624 intf = udev->actconfig->interface[i];
c9f89fa4
DB		 1625 if (is_active(intf)) {
1626 dev_dbg(&intf->dev, "nyet suspended\n");
1627 return -EBUSY;
1da177e4
LT		 1628 }
1629 }
1630 }
1631
1da177e4
LT		 1632 /* "global suspend" of the HC-to-USB interface (root hub), or
1633 * "selective suspend" of just one hub-device link.
1634 */
1635 if (!udev->parent) {
1636 struct usb_bus *bus = udev->bus;
1637 if (bus && bus->op->hub_suspend) {
1638 status = bus->op->hub_suspend (bus);
1639 if (status == 0) {
1640 dev_dbg(&udev->dev, "usb suspend\n");
1641 usb_set_device_state(udev,
1642 USB_STATE_SUSPENDED);
1643 }
1644 } else
1645 status = -EOPNOTSUPP;
1646 } else
1647 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1648 udev);
1649
1650 if (status == 0)
1651 udev->dev.power.power_state = state;
1652 return status;
1653}
1654
1655/**
1656 * usb_suspend_device - suspend a usb device
1657 * @udev: device that's no longer in active use
1658 * @state: PMSG_SUSPEND to suspend
1659 * Context: must be able to sleep; device not locked
1660 *
1661 * Suspends a USB device that isn't in active use, conserving power.
1662 * Devices may wake out of a suspend, if anything important happens,
1663 * using the remote wakeup mechanism. They may also be taken out of
1664 * suspend by the host, using usb_resume_device(). It's also routine
1665 * to disconnect devices while they are suspended.
1666 *
1667 * Suspending OTG devices may trigger HNP, if that's been enabled
1668 * between a pair of dual-role devices. That will change roles, such
1669 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1670 *
1671 * Returns 0 on success, else negative errno.
1672 */
1673int usb_suspend_device(struct usb_device *udev, pm_message_t state)
1674{
1675 int port1, status;
1676
1677 port1 = locktree(udev);
1678 if (port1 < 0)
1679 return port1;
1680
1681 status = __usb_suspend_device(udev, port1, state);
1682 usb_unlock_device(udev);
1683 return status;
1684}
1685
1686/*
1687 * hardware resume signaling is finished, either because of selective
1688 * resume (by host) or remote wakeup (by device) ... now see what changed
1689 * in the tree that's rooted at this device.
1690 */
1691static int finish_port_resume(struct usb_device *udev)
1692{
1693 int status;
1694 u16 devstatus;
1695
1696 /* caller owns the udev device lock */
1697 dev_dbg(&udev->dev, "usb resume\n");
1698
1699 /* usb ch9 identifies four variants of SUSPENDED, based on what
1700 * state the device resumes to. Linux currently won't see the
1701 * first two on the host side; they'd be inside hub_port_init()
1702 * during many timeouts, but khubd can't suspend until later.
1703 */
1704 usb_set_device_state(udev, udev->actconfig
1705 ? USB_STATE_CONFIGURED
1706 : USB_STATE_ADDRESS);
1707 udev->dev.power.power_state = PMSG_ON;
1708
1709 /* 10.5.4.5 says be sure devices in the tree are still there.
1710 * For now let's assume the device didn't go crazy on resume,
1711 * and device drivers will know about any resume quirks.
1712 */
1713 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1714 if (status < 0)
1715 dev_dbg(&udev->dev,
1716 "gone after usb resume? status %d\n",
1717 status);
1718 else if (udev->actconfig) {
1719 unsigned i;
1720
1721 le16_to_cpus(&devstatus);
1722 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
1723 status = usb_control_msg(udev,
1724 usb_sndctrlpipe(udev, 0),
1725 USB_REQ_CLEAR_FEATURE,
1726 USB_RECIP_DEVICE,
1727 USB_DEVICE_REMOTE_WAKEUP, 0,
1728 NULL, 0,
1729 USB_CTRL_SET_TIMEOUT);
1730 if (status) {
1731 dev_dbg(&udev->dev, "disable remote "
1732 "wakeup, status %d\n", status);
1733 status = 0;
1734 }
1735 }
1736
1737 /* resume interface drivers; if this is a hub, it
1738 * resumes the child devices
1739 */
1740 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1741 struct usb_interface *intf;
1742 struct usb_driver *driver;
1743
1744 intf = udev->actconfig->interface[i];
db690874 1745 if (is_active(intf))
1da177e4
LT		 1746 continue;
1747 if (!intf->dev.driver) {
1748 /* FIXME maybe force to alt 0 */
1749 continue;
1750 }
1751 driver = to_usb_driver(intf->dev.driver);
1752
1753 /* bus_rescan_devices() may rebind drivers */
1754 if (!driver->resume)
1755 continue;
1756
1757 /* can we do better than just logging errors? */
db690874 1758 mark_active(intf);
1da177e4 1759 status = driver->resume(intf);
db690874
DB		 1760 if (status < 0) {
1761 mark_quiesced(intf);
1da177e4 1762 dev_dbg(&intf->dev,
db690874
DB		 1763 "resume error %d\n",
1764 status);
1765 }
1da177e4
LT		 1766 }
1767 status = 0;
1768
1769 } else if (udev->devnum <= 0) {
1770 dev_dbg(&udev->dev, "bogus resume!\n");
1771 status = -EINVAL;
1772 }
1773 return status;
1774}
1775
1776static int
1777hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1778{
1779 int status;
1780
1781 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1782
1783 /* see 7.1.7.7; affects power usage, but not budgeting */
1784 status = clear_port_feature(hub->hdev,
1785 port1, USB_PORT_FEAT_SUSPEND);
1786 if (status) {
1787 dev_dbg(hub->intfdev,
1788 "can't resume port %d, status %d\n",
1789 port1, status);
1790 } else {
1791 u16 devstatus;
1792 u16 portchange;
1793
1794 /* drive resume for at least 20 msec */
1795 if (udev)
1796 dev_dbg(&udev->dev, "RESUME\n");
1797 msleep(25);
1798
1799#define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1800 | USB_PORT_STAT_ENABLE \
1801 | USB_PORT_STAT_CONNECTION)
1802
1803 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1804 * stop resume signaling. Then finish the resume
1805 * sequence.
1806 */
1807 devstatus = portchange = 0;
1808 status = hub_port_status(hub, port1,
1809 &devstatus, &portchange);
1810 if (status < 0
1811 || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
1812 || (devstatus & USB_PORT_STAT_SUSPEND) != 0
1813 ) {
1814 dev_dbg(hub->intfdev,
1815 "port %d status %04x.%04x after resume, %d\n",
1816 port1, portchange, devstatus, status);
1817 } else {
1818 /* TRSMRCY = 10 msec */
1819 msleep(10);
1820 if (udev)
1821 status = finish_port_resume(udev);
1822 }
1823 }
1824 if (status < 0)
1825 hub_port_logical_disconnect(hub, port1);
1826
1827 return status;
1828}
1829
1830static int hub_resume (struct usb_interface *intf);
1831
1832/**
1833 * usb_resume_device - re-activate a suspended usb device
1834 * @udev: device to re-activate
1835 * Context: must be able to sleep; device not locked
1836 *
1837 * This will re-activate the suspended device, increasing power usage
1838 * while letting drivers communicate again with its endpoints.
1839 * USB resume explicitly guarantees that the power session between
1840 * the host and the device is the same as it was when the device
1841 * suspended.
1842 *
1843 * Returns 0 on success, else negative errno.
1844 */
1845int usb_resume_device(struct usb_device *udev)
1846{
1847 int port1, status;
1848
1849 port1 = locktree(udev);
1850 if (port1 < 0)
1851 return port1;
1852
1853 /* "global resume" of the HC-to-USB interface (root hub), or
1854 * selective resume of one hub-to-device port
1855 */
1856 if (!udev->parent) {
1857 struct usb_bus *bus = udev->bus;
1858 if (bus && bus->op->hub_resume) {
1859 status = bus->op->hub_resume (bus);
1860 } else
1861 status = -EOPNOTSUPP;
1862 if (status == 0) {
1863 dev_dbg(&udev->dev, "usb resume\n");
1864 /* TRSMRCY = 10 msec */
1865 msleep(10);
1866 usb_set_device_state (udev, USB_STATE_CONFIGURED);
1867 udev->dev.power.power_state = PMSG_ON;
1868 status = hub_resume (udev
1869 ->actconfig->interface[0]);
1870 }
1871 } else if (udev->state == USB_STATE_SUSPENDED) {
1872 // NOTE this fails if parent is also suspended...
1873 status = hub_port_resume(hdev_to_hub(udev->parent),
1874 port1, udev);
1875 } else {
1876 status = 0;
1877 }
1878 if (status < 0) {
1879 dev_dbg(&udev->dev, "can't resume, status %d\n",
1880 status);
1881 }
1882
1883 usb_unlock_device(udev);
1884
1885 /* rebind drivers that had no suspend() */
1886 if (status == 0) {
1887 usb_lock_all_devices();
1888 bus_rescan_devices(&usb_bus_type);
1889 usb_unlock_all_devices();
1890 }
1891 return status;
1892}
1893
1894static int remote_wakeup(struct usb_device *udev)
1895{
1896 int status = 0;
1897
1898 /* don't repeat RESUME sequence if this device
1899 * was already woken up by some other task
1900 */
1901 down(&udev->serialize);
1902 if (udev->state == USB_STATE_SUSPENDED) {
1903 dev_dbg(&udev->dev, "RESUME (wakeup)\n");
1904 /* TRSMRCY = 10 msec */
1905 msleep(10);
1906 status = finish_port_resume(udev);
1907 }
1908 up(&udev->serialize);
1909 return status;
1910}
1911
db690874 1912static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1da177e4
LT		 1913{
1914 struct usb_hub *hub = usb_get_intfdata (intf);
1915 struct usb_device *hdev = hub->hdev;
1916 unsigned port1;
1da177e4 1917
c9f89fa4 1918 /* fail if children aren't already suspended */
1da177e4
LT		 1919 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1920 struct usb_device *udev;
1921
1922 udev = hdev->children [port1-1];
c9f89fa4
DB		 1923 if (udev && udev->state != USB_STATE_SUSPENDED) {
1924 dev_dbg(&intf->dev, "port %d nyet suspended\n", port1);
1925 return -EBUSY;
1926 }
1da177e4
LT		 1927 }
1928
c9f89fa4
DB		 1929 /* stop khubd and related activity */
1930 hub_quiesce(hub);
1da177e4
LT		 1931 return 0;
1932}
1933
1934static int hub_resume(struct usb_interface *intf)
1935{
1936 struct usb_device *hdev = interface_to_usbdev(intf);
1937 struct usb_hub *hub = usb_get_intfdata (intf);
1938 unsigned port1;
1939 int status;
1940
1da177e4
LT		 1941 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1942 struct usb_device *udev;
1943 u16 portstat, portchange;
1944
1945 udev = hdev->children [port1-1];
1946 status = hub_port_status(hub, port1, &portstat, &portchange);
1947 if (status == 0) {
1948 if (portchange & USB_PORT_STAT_C_SUSPEND) {
1949 clear_port_feature(hdev, port1,
1950 USB_PORT_FEAT_C_SUSPEND);
1951 portchange &= ~USB_PORT_STAT_C_SUSPEND;
1952 }
1953
1954 /* let khubd handle disconnects etc */
1955 if (portchange)
1956 continue;
1957 }
1958
1959 if (!udev || status < 0)
1960 continue;
1961 down (&udev->serialize);
1962 if (portstat & USB_PORT_STAT_SUSPEND)
1963 status = hub_port_resume(hub, port1, udev);
1964 else {
1965 status = finish_port_resume(udev);
1966 if (status < 0) {
1967 dev_dbg(&intf->dev, "resume port %d --> %d\n",
1968 port1, status);
1969 hub_port_logical_disconnect(hub, port1);
1970 }
1971 }
1972 up(&udev->serialize);
1973 }
1da177e4
LT		 1974 hub->resume_root_hub = 0;
1975 hub_activate(hub);
1976 return 0;
1977}
1978
1979void usb_resume_root_hub(struct usb_device *hdev)
1980{
1981 struct usb_hub *hub = hdev_to_hub(hdev);
1982
1983 hub->resume_root_hub = 1;
1984 kick_khubd(hub);
1985}
1986
1987#else /* !CONFIG_USB_SUSPEND */
1988
1989int usb_suspend_device(struct usb_device *udev, pm_message_t state)
1990{
1991 return 0;
1992}
1993
1994int usb_resume_device(struct usb_device *udev)
1995{
1996 return 0;
1997}
1998
1999#define hub_suspend NULL
2000#define hub_resume NULL
2001#define remote_wakeup(x) 0
2002
2003#endif /* CONFIG_USB_SUSPEND */
2004
2005EXPORT_SYMBOL(usb_suspend_device);
2006EXPORT_SYMBOL(usb_resume_device);
2007
2008
2009
2010/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2011 *
2012 * Between connect detection and reset signaling there must be a delay
2013 * of 100ms at least for debounce and power-settling. The corresponding
2014 * timer shall restart whenever the downstream port detects a disconnect.
2015 *
2016 * Apparently there are some bluetooth and irda-dongles and a number of
2017 * low-speed devices for which this debounce period may last over a second.
2018 * Not covered by the spec - but easy to deal with.
2019 *
2020 * This implementation uses a 1500ms total debounce timeout; if the
2021 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2022 * every 25ms for transient disconnects. When the port status has been
2023 * unchanged for 100ms it returns the port status.
2024 */
2025
2026#define HUB_DEBOUNCE_TIMEOUT 1500
2027#define HUB_DEBOUNCE_STEP 25
2028#define HUB_DEBOUNCE_STABLE 100
2029
2030static int hub_port_debounce(struct usb_hub *hub, int port1)
2031{
2032 int ret;
2033 int total_time, stable_time = 0;
2034 u16 portchange, portstatus;
2035 unsigned connection = 0xffff;
2036
2037 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2038 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2039 if (ret < 0)
2040 return ret;
2041
2042 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2043 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2044 stable_time += HUB_DEBOUNCE_STEP;
2045 if (stable_time >= HUB_DEBOUNCE_STABLE)
2046 break;
2047 } else {
2048 stable_time = 0;
2049 connection = portstatus & USB_PORT_STAT_CONNECTION;
2050 }
2051
2052 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2053 clear_port_feature(hub->hdev, port1,
2054 USB_PORT_FEAT_C_CONNECTION);
2055 }
2056
2057 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2058 break;
2059 msleep(HUB_DEBOUNCE_STEP);
2060 }
2061
2062 dev_dbg (hub->intfdev,
2063 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2064 port1, total_time, stable_time, portstatus);
2065
2066 if (stable_time < HUB_DEBOUNCE_STABLE)
2067 return -ETIMEDOUT;
2068 return portstatus;
2069}
2070
2071static void ep0_reinit(struct usb_device *udev)
2072{
2073 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2074 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2075 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2076}
2077
2078#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2079#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2080
2081static int hub_set_address(struct usb_device *udev)
2082{
2083 int retval;
2084
2085 if (udev->devnum == 0)
2086 return -EINVAL;
2087 if (udev->state == USB_STATE_ADDRESS)
2088 return 0;
2089 if (udev->state != USB_STATE_DEFAULT)
2090 return -EINVAL;
2091 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2092 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2093 NULL, 0, USB_CTRL_SET_TIMEOUT);
2094 if (retval == 0) {
2095 usb_set_device_state(udev, USB_STATE_ADDRESS);
2096 ep0_reinit(udev);
2097 }
2098 return retval;
2099}
2100
2101/* Reset device, (re)assign address, get device descriptor.
2102 * Device connection must be stable, no more debouncing needed.
2103 * Returns device in USB_STATE_ADDRESS, except on error.
2104 *
2105 * If this is called for an already-existing device (as part of
2106 * usb_reset_device), the caller must own the device lock. For a
2107 * newly detected device that is not accessible through any global
2108 * pointers, it's not necessary to lock the device.
2109 */
2110static int
2111hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2112 int retry_counter)
2113{
2114 static DECLARE_MUTEX(usb_address0_sem);
2115
2116 struct usb_device *hdev = hub->hdev;
2117 int i, j, retval;
2118 unsigned delay = HUB_SHORT_RESET_TIME;
2119 enum usb_device_speed oldspeed = udev->speed;
2120
2121 /* root hub ports have a slightly longer reset period
2122 * (from USB 2.0 spec, section 7.1.7.5)
2123 */
2124 if (!hdev->parent) {
2125 delay = HUB_ROOT_RESET_TIME;
2126 if (port1 == hdev->bus->otg_port)
2127 hdev->bus->b_hnp_enable = 0;
2128 }
2129
2130 /* Some low speed devices have problems with the quick delay, so */
2131 /* be a bit pessimistic with those devices. RHbug #23670 */
2132 if (oldspeed == USB_SPEED_LOW)
2133 delay = HUB_LONG_RESET_TIME;
2134
2135 down(&usb_address0_sem);
2136
2137 /* Reset the device; full speed may morph to high speed */
2138 retval = hub_port_reset(hub, port1, udev, delay);
2139 if (retval < 0) /* error or disconnect */
2140 goto fail;
2141 /* success, speed is known */
2142 retval = -ENODEV;
2143
2144 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2145 dev_dbg(&udev->dev, "device reset changed speed!\n");
2146 goto fail;
2147 }
2148 oldspeed = udev->speed;
2149
2150 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2151 * it's fixed size except for full speed devices.
2152 */
2153 switch (udev->speed) {
2154 case USB_SPEED_HIGH: /* fixed at 64 */
2155 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2156 break;
2157 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2158 /* to determine the ep0 maxpacket size, try to read
2159 * the device descriptor to get bMaxPacketSize0 and
2160 * then correct our initial guess.
2161 */
2162 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2163 break;
2164 case USB_SPEED_LOW: /* fixed at 8 */
2165 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2166 break;
2167 default:
2168 goto fail;
2169 }
2170
2171 dev_info (&udev->dev,
2172 "%s %s speed USB device using %s and address %d\n",
2173 (udev->config) ? "reset" : "new",
2174 ({ char *speed; switch (udev->speed) {
2175 case USB_SPEED_LOW: speed = "low"; break;
2176 case USB_SPEED_FULL: speed = "full"; break;
2177 case USB_SPEED_HIGH: speed = "high"; break;
2178 default: speed = "?"; break;
2179 }; speed;}),
2180 udev->bus->controller->driver->name,
2181 udev->devnum);
2182
2183 /* Set up TT records, if needed */
2184 if (hdev->tt) {
2185 udev->tt = hdev->tt;
2186 udev->ttport = hdev->ttport;
2187 } else if (udev->speed != USB_SPEED_HIGH
2188 && hdev->speed == USB_SPEED_HIGH) {
2189 udev->tt = &hub->tt;
2190 udev->ttport = port1;
2191 }
2192
2193 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2194 * Because device hardware and firmware is sometimes buggy in
2195 * this area, and this is how Linux has done it for ages.
2196 * Change it cautiously.
2197 *
2198 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2199 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2200 * so it may help with some non-standards-compliant devices.
2201 * Otherwise we start with SET_ADDRESS and then try to read the
2202 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2203 * value.
2204 */
2205 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2206 if (USE_NEW_SCHEME(retry_counter)) {
2207 struct usb_device_descriptor *buf;
2208 int r = 0;
2209
2210#define GET_DESCRIPTOR_BUFSIZE 64
2211 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2212 if (!buf) {
2213 retval = -ENOMEM;
2214 continue;
2215 }
2216
2217 /* Use a short timeout the first time through,
2218 * so that recalcitrant full-speed devices with
2219 * 8- or 16-byte ep0-maxpackets won't slow things
2220 * down tremendously by NAKing the unexpectedly
2221 * early status stage. Also, retry on all errors;
2222 * some devices are flakey.
2223 */
2224 for (j = 0; j < 3; ++j) {
2225 buf->bMaxPacketSize0 = 0;
2226 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2227 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2228 USB_DT_DEVICE << 8, 0,
2229 buf, GET_DESCRIPTOR_BUFSIZE,
2230 (i ? USB_CTRL_GET_TIMEOUT : 1000));
2231 switch (buf->bMaxPacketSize0) {
2232 case 8: case 16: case 32: case 64:
2233 if (buf->bDescriptorType ==
2234 USB_DT_DEVICE) {
2235 r = 0;
2236 break;
2237 }
2238 /* FALL THROUGH */
2239 default:
2240 if (r == 0)
2241 r = -EPROTO;
2242 break;
2243 }
2244 if (r == 0)
2245 break;
2246 }
2247 udev->descriptor.bMaxPacketSize0 =
2248 buf->bMaxPacketSize0;
2249 kfree(buf);
2250
2251 retval = hub_port_reset(hub, port1, udev, delay);
2252 if (retval < 0) /* error or disconnect */
2253 goto fail;
2254 if (oldspeed != udev->speed) {
2255 dev_dbg(&udev->dev,
2256 "device reset changed speed!\n");
2257 retval = -ENODEV;
2258 goto fail;
2259 }
2260 if (r) {
2261 dev_err(&udev->dev, "device descriptor "
2262 "read/%s, error %d\n",
2263 "64", r);
2264 retval = -EMSGSIZE;
2265 continue;
2266 }
2267#undef GET_DESCRIPTOR_BUFSIZE
2268 }
2269
2270 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2271 retval = hub_set_address(udev);
2272 if (retval >= 0)
2273 break;
2274 msleep(200);
2275 }
2276 if (retval < 0) {
2277 dev_err(&udev->dev,
2278 "device not accepting address %d, error %d\n",
2279 udev->devnum, retval);
2280 goto fail;
2281 }
2282
2283 /* cope with hardware quirkiness:
2284 * - let SET_ADDRESS settle, some device hardware wants it
2285 * - read ep0 maxpacket even for high and low speed,
2286 */
2287 msleep(10);
2288 if (USE_NEW_SCHEME(retry_counter))
2289 break;
2290
2291 retval = usb_get_device_descriptor(udev, 8);
2292 if (retval < 8) {
2293 dev_err(&udev->dev, "device descriptor "
2294 "read/%s, error %d\n",
2295 "8", retval);
2296 if (retval >= 0)
2297 retval = -EMSGSIZE;
2298 } else {
2299 retval = 0;
2300 break;
2301 }
2302 }
2303 if (retval)
2304 goto fail;
2305
2306 i = udev->descriptor.bMaxPacketSize0;
2307 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2308 if (udev->speed != USB_SPEED_FULL ||
2309 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2310 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2311 retval = -EMSGSIZE;
2312 goto fail;
2313 }
2314 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2315 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2316 ep0_reinit(udev);
2317 }
2318
2319 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2320 if (retval < (signed)sizeof(udev->descriptor)) {
2321 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2322 "all", retval);
2323 if (retval >= 0)
2324 retval = -ENOMSG;
2325 goto fail;
2326 }
2327
2328 retval = 0;
2329
2330fail:
2331 if (retval)
2332 hub_port_disable(hub, port1, 0);
2333 up(&usb_address0_sem);
2334 return retval;
2335}
2336
2337static void
2338check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2339{
2340 struct usb_qualifier_descriptor *qual;
2341 int status;
2342
2343 qual = kmalloc (sizeof *qual, SLAB_KERNEL);
2344 if (qual == NULL)
2345 return;
2346
2347 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2348 qual, sizeof *qual);
2349 if (status == sizeof *qual) {
2350 dev_info(&udev->dev, "not running at top speed; "
2351 "connect to a high speed hub\n");
2352 /* hub LEDs are probably harder to miss than syslog */
2353 if (hub->has_indicators) {
2354 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2355 schedule_work (&hub->leds);
2356 }
2357 }
1bc3c9e1 2358 kfree(qual);
1da177e4
LT		 2359}
2360
2361static unsigned
2362hub_power_remaining (struct usb_hub *hub)
2363{
2364 struct usb_device *hdev = hub->hdev;
2365 int remaining;
2366 unsigned i;
2367
2368 remaining = hub->power_budget;
2369 if (!remaining) /* self-powered */
2370 return 0;
2371
2372 for (i = 0; i < hdev->maxchild; i++) {
2373 struct usb_device *udev = hdev->children[i];
2374 int delta, ceiling;
2375
2376 if (!udev)
2377 continue;
2378
2379 /* 100mA per-port ceiling, or 8mA for OTG ports */
2380 if (i != (udev->bus->otg_port - 1) || hdev->parent)
2381 ceiling = 50;
2382 else
2383 ceiling = 4;
2384
2385 if (udev->actconfig)
2386 delta = udev->actconfig->desc.bMaxPower;
2387 else
2388 delta = ceiling;
2389 // dev_dbg(&udev->dev, "budgeted %dmA\n", 2 * delta);
2390 if (delta > ceiling)
2391 dev_warn(&udev->dev, "%dmA over %dmA budget!\n",
2392 2 * (delta - ceiling), 2 * ceiling);
2393 remaining -= delta;
2394 }
2395 if (remaining < 0) {
2396 dev_warn(hub->intfdev,
2397 "%dmA over power budget!\n",
2398 -2 * remaining);
2399 remaining = 0;
2400 }
2401 return remaining;
2402}
2403
2404/* Handle physical or logical connection change events.
2405 * This routine is called when:
2406 * a port connection-change occurs;
2407 * a port enable-change occurs (often caused by EMI);
2408 * usb_reset_device() encounters changed descriptors (as from
2409 * a firmware download)
2410 * caller already locked the hub
2411 */
2412static void hub_port_connect_change(struct usb_hub *hub, int port1,
2413 u16 portstatus, u16 portchange)
2414{
2415 struct usb_device *hdev = hub->hdev;
2416 struct device *hub_dev = hub->intfdev;
2417 int status, i;
2418
2419 dev_dbg (hub_dev,
2420 "port %d, status %04x, change %04x, %s\n",
2421 port1, portstatus, portchange, portspeed (portstatus));
2422
2423 if (hub->has_indicators) {
2424 set_port_led(hub, port1, HUB_LED_AUTO);
2425 hub->indicator[port1-1] = INDICATOR_AUTO;
2426 }
2427
2428 /* Disconnect any existing devices under this port */
2429 if (hdev->children[port1-1])
2430 usb_disconnect(&hdev->children[port1-1]);
2431 clear_bit(port1, hub->change_bits);
2432
2433#ifdef CONFIG_USB_OTG
2434 /* during HNP, don't repeat the debounce */
2435 if (hdev->bus->is_b_host)
2436 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2437#endif
2438
2439 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2440 status = hub_port_debounce(hub, port1);
2441 if (status < 0) {
2442 dev_err (hub_dev,
2443 "connect-debounce failed, port %d disabled\n",
2444 port1);
2445 goto done;
2446 }
2447 portstatus = status;
2448 }
2449
2450 /* Return now if nothing is connected */
2451 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2452
2453 /* maybe switch power back on (e.g. root hub was reset) */
2454 if ((hub->descriptor->wHubCharacteristics
2455 & HUB_CHAR_LPSM) < 2
2456 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2457 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2458
2459 if (portstatus & USB_PORT_STAT_ENABLE)
2460 goto done;
2461 return;
2462 }
2463
2464#ifdef CONFIG_USB_SUSPEND
2465 /* If something is connected, but the port is suspended, wake it up. */
2466 if (portstatus & USB_PORT_STAT_SUSPEND) {
2467 status = hub_port_resume(hub, port1, NULL);
2468 if (status < 0) {
2469 dev_dbg(hub_dev,
2470 "can't clear suspend on port %d; %d\n",
2471 port1, status);
2472 goto done;
2473 }
2474 }
2475#endif
2476
2477 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2478 struct usb_device *udev;
2479
2480 /* reallocate for each attempt, since references
2481 * to the previous one can escape in various ways
2482 */
2483 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2484 if (!udev) {
2485 dev_err (hub_dev,
2486 "couldn't allocate port %d usb_device\n",
2487 port1);
2488 goto done;
2489 }
2490
2491 usb_set_device_state(udev, USB_STATE_POWERED);
2492 udev->speed = USB_SPEED_UNKNOWN;
2493
2494 /* set the address */
2495 choose_address(udev);
2496 if (udev->devnum <= 0) {
2497 status = -ENOTCONN; /* Don't retry */
2498 goto loop;
2499 }
2500
2501 /* reset and get descriptor */
2502 status = hub_port_init(hub, udev, port1, i);
2503 if (status < 0)
2504 goto loop;
2505
2506 /* consecutive bus-powered hubs aren't reliable; they can
2507 * violate the voltage drop budget. if the new child has
2508 * a "powered" LED, users should notice we didn't enable it
2509 * (without reading syslog), even without per-port LEDs
2510 * on the parent.
2511 */
2512 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2513 && hub->power_budget) {
2514 u16 devstat;
2515
2516 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2517 &devstat);
2518 if (status < 0) {
2519 dev_dbg(&udev->dev, "get status %d ?\n", status);
2520 goto loop_disable;
2521 }
2522 cpu_to_le16s(&devstat);
2523 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2524 dev_err(&udev->dev,
2525 "can't connect bus-powered hub "
2526 "to this port\n");
2527 if (hub->has_indicators) {
2528 hub->indicator[port1-1] =
2529 INDICATOR_AMBER_BLINK;
2530 schedule_work (&hub->leds);
2531 }
2532 status = -ENOTCONN; /* Don't retry */
2533 goto loop_disable;
2534 }
2535 }
2536
2537 /* check for devices running slower than they could */
2538 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2539 && udev->speed == USB_SPEED_FULL
2540 && highspeed_hubs != 0)
2541 check_highspeed (hub, udev, port1);
2542
2543 /* Store the parent's children[] pointer. At this point
2544 * udev becomes globally accessible, although presumably
2545 * no one will look at it until hdev is unlocked.
2546 */
2547 down (&udev->serialize);
2548 status = 0;
2549
2550 /* We mustn't add new devices if the parent hub has
2551 * been disconnected; we would race with the
2552 * recursively_mark_NOTATTACHED() routine.
2553 */
2554 spin_lock_irq(&device_state_lock);
2555 if (hdev->state == USB_STATE_NOTATTACHED)
2556 status = -ENOTCONN;
2557 else
2558 hdev->children[port1-1] = udev;
2559 spin_unlock_irq(&device_state_lock);
2560
2561 /* Run it through the hoops (find a driver, etc) */
2562 if (!status) {
2563 status = usb_new_device(udev);
2564 if (status) {
2565 spin_lock_irq(&device_state_lock);
2566 hdev->children[port1-1] = NULL;
2567 spin_unlock_irq(&device_state_lock);
2568 }
2569 }
2570
2571 up (&udev->serialize);
2572 if (status)
2573 goto loop_disable;
2574
2575 status = hub_power_remaining(hub);
2576 if (status)
2577 dev_dbg(hub_dev,
2578 "%dmA power budget left\n",
2579 2 * status);
2580
2581 return;
2582
2583loop_disable:
2584 hub_port_disable(hub, port1, 1);
2585loop:
2586 ep0_reinit(udev);
2587 release_address(udev);
2588 usb_put_dev(udev);
2589 if (status == -ENOTCONN)
2590 break;
2591 }
2592
2593done:
2594 hub_port_disable(hub, port1, 1);
2595}
2596
2597static void hub_events(void)
2598{
2599 struct list_head *tmp;
2600 struct usb_device *hdev;
2601 struct usb_interface *intf;
2602 struct usb_hub *hub;
2603 struct device *hub_dev;
2604 u16 hubstatus;
2605 u16 hubchange;
2606 u16 portstatus;
2607 u16 portchange;
2608 int i, ret;
2609 int connect_change;
2610
2611 /*
2612 * We restart the list every time to avoid a deadlock with
2613 * deleting hubs downstream from this one. This should be
2614 * safe since we delete the hub from the event list.
2615 * Not the most efficient, but avoids deadlocks.
2616 */
2617 while (1) {
2618
2619 /* Grab the first entry at the beginning of the list */
2620 spin_lock_irq(&hub_event_lock);
2621 if (list_empty(&hub_event_list)) {
2622 spin_unlock_irq(&hub_event_lock);
2623 break;
2624 }
2625
2626 tmp = hub_event_list.next;
2627 list_del_init(tmp);
2628
2629 hub = list_entry(tmp, struct usb_hub, event_list);
2630 hdev = hub->hdev;
2631 intf = to_usb_interface(hub->intfdev);
2632 hub_dev = &intf->dev;
2633
2634 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
2635 hdev->state, hub->descriptor
2636 ? hub->descriptor->bNbrPorts
2637 : 0,
2638 /* NOTE: expects max 15 ports... */
2639 (u16) hub->change_bits[0],
2640 (u16) hub->event_bits[0]);
2641
2642 usb_get_intf(intf);
2643 i = hub->resume_root_hub;
2644 spin_unlock_irq(&hub_event_lock);
2645
2646 /* Is this is a root hub wanting to be resumed? */
2647 if (i)
2648 usb_resume_device(hdev);
2649
2650 /* Lock the device, then check to see if we were
2651 * disconnected while waiting for the lock to succeed. */
2652 if (locktree(hdev) < 0) {
2653 usb_put_intf(intf);
2654 continue;
2655 }
2656 if (hub != usb_get_intfdata(intf))
2657 goto loop;
2658
2659 /* If the hub has died, clean up after it */
2660 if (hdev->state == USB_STATE_NOTATTACHED) {
2661 hub_pre_reset(hub);
2662 goto loop;
2663 }
2664
2665 /* If this is an inactive or suspended hub, do nothing */
2666 if (hub->quiescing)
2667 goto loop;
2668
2669 if (hub->error) {
2670 dev_dbg (hub_dev, "resetting for error %d\n",
2671 hub->error);
2672
2673 ret = usb_reset_device(hdev);
2674 if (ret) {
2675 dev_dbg (hub_dev,
2676 "error resetting hub: %d\n", ret);
2677 goto loop;
2678 }
2679
2680 hub->nerrors = 0;
2681 hub->error = 0;
2682 }
2683
2684 /* deal with port status changes */
2685 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2686 if (test_bit(i, hub->busy_bits))
2687 continue;
2688 connect_change = test_bit(i, hub->change_bits);
2689 if (!test_and_clear_bit(i, hub->event_bits) &&
2690 !connect_change && !hub->activating)
2691 continue;
2692
2693 ret = hub_port_status(hub, i,
2694 &portstatus, &portchange);
2695 if (ret < 0)
2696 continue;
2697
2698 if (hub->activating && !hdev->children[i-1] &&
2699 (portstatus &
2700 USB_PORT_STAT_CONNECTION))
2701 connect_change = 1;
2702
2703 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2704 clear_port_feature(hdev, i,
2705 USB_PORT_FEAT_C_CONNECTION);
2706 connect_change = 1;
2707 }
2708
2709 if (portchange & USB_PORT_STAT_C_ENABLE) {
2710 if (!connect_change)
2711 dev_dbg (hub_dev,
2712 "port %d enable change, "
2713 "status %08x\n",
2714 i, portstatus);
2715 clear_port_feature(hdev, i,
2716 USB_PORT_FEAT_C_ENABLE);
2717
2718 /*
2719 * EM interference sometimes causes badly
2720 * shielded USB devices to be shutdown by
2721 * the hub, this hack enables them again.
2722 * Works at least with mouse driver.
2723 */
2724 if (!(portstatus & USB_PORT_STAT_ENABLE)
2725 && !connect_change
2726 && hdev->children[i-1]) {
2727 dev_err (hub_dev,
2728 "port %i "
2729 "disabled by hub (EMI?), "
2730 "re-enabling...\n",
2731 i);
2732 connect_change = 1;
2733 }
2734 }
2735
2736 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2737 clear_port_feature(hdev, i,
2738 USB_PORT_FEAT_C_SUSPEND);
2739 if (hdev->children[i-1]) {
2740 ret = remote_wakeup(hdev->
2741 children[i-1]);
2742 if (ret < 0)
2743 connect_change = 1;
2744 } else {
2745 ret = -ENODEV;
2746 hub_port_disable(hub, i, 1);
2747 }
2748 dev_dbg (hub_dev,
2749 "resume on port %d, status %d\n",
2750 i, ret);
2751 }
2752
2753 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2754 dev_err (hub_dev,
2755 "over-current change on port %d\n",
2756 i);
2757 clear_port_feature(hdev, i,
2758 USB_PORT_FEAT_C_OVER_CURRENT);
2759 hub_power_on(hub);
2760 }
2761
2762 if (portchange & USB_PORT_STAT_C_RESET) {
2763 dev_dbg (hub_dev,
2764 "reset change on port %d\n",
2765 i);
2766 clear_port_feature(hdev, i,
2767 USB_PORT_FEAT_C_RESET);
2768 }
2769
2770 if (connect_change)
2771 hub_port_connect_change(hub, i,
2772 portstatus, portchange);
2773 } /* end for i */
2774
2775 /* deal with hub status changes */
2776 if (test_and_clear_bit(0, hub->event_bits) == 0)
2777 ; /* do nothing */
2778 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2779 dev_err (hub_dev, "get_hub_status failed\n");
2780 else {
2781 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2782 dev_dbg (hub_dev, "power change\n");
2783 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
2784 }
2785 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2786 dev_dbg (hub_dev, "overcurrent change\n");
2787 msleep(500); /* Cool down */
2788 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2789 hub_power_on(hub);
2790 }
2791 }
2792
2793 hub->activating = 0;
2794
d5926ae7
AS		 2795 /* If this is a root hub, tell the HCD it's okay to
2796 * re-enable port-change interrupts now. */
2797 if (!hdev->parent)
2798 usb_enable_root_hub_irq(hdev->bus);
2799
1da177e4
LT		 2800loop:
2801 usb_unlock_device(hdev);
2802 usb_put_intf(intf);
2803
2804 } /* end while (1) */
2805}
2806
2807static int hub_thread(void *__unused)
2808{
1da177e4
LT		 2809 do {
2810 hub_events();
9c8d6178
AM		 2811 wait_event_interruptible(khubd_wait,
2812 !list_empty(&hub_event_list) ||
2813 kthread_should_stop());
3e1d1d28 2814 try_to_freeze();
9c8d6178 2815 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
1da177e4 2816
9c8d6178
AM		 2817 pr_debug("%s: khubd exiting\n", usbcore_name);
2818 return 0;
1da177e4
LT		 2819}
2820
2821static struct usb_device_id hub_id_table [] = {
2822 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2823 .bDeviceClass = USB_CLASS_HUB},
2824 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2825 .bInterfaceClass = USB_CLASS_HUB},
2826 { } /* Terminating entry */
2827};
2828
2829MODULE_DEVICE_TABLE (usb, hub_id_table);
2830
2831static struct usb_driver hub_driver = {
2832 .owner = THIS_MODULE,
2833 .name = "hub",
2834 .probe = hub_probe,
2835 .disconnect = hub_disconnect,
2836 .suspend = hub_suspend,
2837 .resume = hub_resume,
2838 .ioctl = hub_ioctl,
2839 .id_table = hub_id_table,
2840};
2841
2842int usb_hub_init(void)
2843{
1da177e4
LT		 2844 if (usb_register(&hub_driver) < 0) {
2845 printk(KERN_ERR "%s: can't register hub driver\n",
2846 usbcore_name);
2847 return -1;
2848 }
2849
9c8d6178
AM		 2850 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2851 if (!IS_ERR(khubd_task))
1da177e4 2852 return 0;
1da177e4
LT		 2853
2854 /* Fall through if kernel_thread failed */
2855 usb_deregister(&hub_driver);
2856 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2857
2858 return -1;
2859}
2860
2861void usb_hub_cleanup(void)
2862{
9c8d6178 2863 kthread_stop(khubd_task);
1da177e4
LT		 2864
2865 /*
2866 * Hub resources are freed for us by usb_deregister. It calls
2867 * usb_driver_purge on every device which in turn calls that
2868 * devices disconnect function if it is using this driver.
2869 * The hub_disconnect function takes care of releasing the
2870 * individual hub resources. -greg
2871 */
2872 usb_deregister(&hub_driver);
2873} /* usb_hub_cleanup() */
2874
1da177e4
LT		 2875static int config_descriptors_changed(struct usb_device *udev)
2876{
2877 unsigned index;
2878 unsigned len = 0;
2879 struct usb_config_descriptor *buf;
2880
2881 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2882 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2883 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2884 }
2885 buf = kmalloc (len, SLAB_KERNEL);
2886 if (buf == NULL) {
2887 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2888 /* assume the worst */
2889 return 1;
2890 }
2891 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2892 int length;
2893 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2894
2895 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2896 old_length);
2897 if (length < old_length) {
2898 dev_dbg(&udev->dev, "config index %d, error %d\n",
2899 index, length);
2900 break;
2901 }
2902 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2903 != 0) {
2904 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2905 index, buf->bConfigurationValue);
2906 break;
2907 }
2908 }
2909 kfree(buf);
2910 return index != udev->descriptor.bNumConfigurations;
2911}
2912
2913/**
2914 * usb_reset_device - perform a USB port reset to reinitialize a device
2915 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2916 *
2917 * WARNING - don't reset any device unless drivers for all of its
2918 * interfaces are expecting that reset! Maybe some driver->reset()
2919 * method should eventually help ensure sufficient cooperation.
2920 *
2921 * Do a port reset, reassign the device's address, and establish its
2922 * former operating configuration. If the reset fails, or the device's
2923 * descriptors change from their values before the reset, or the original
2924 * configuration and altsettings cannot be restored, a flag will be set
2925 * telling khubd to pretend the device has been disconnected and then
2926 * re-connected. All drivers will be unbound, and the device will be
2927 * re-enumerated and probed all over again.
2928 *
2929 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2930 * flagged for logical disconnection, or some other negative error code
2931 * if the reset wasn't even attempted.
2932 *
2933 * The caller must own the device lock. For example, it's safe to use
2934 * this from a driver probe() routine after downloading new firmware.
2935 * For calls that might not occur during probe(), drivers should lock
2936 * the device using usb_lock_device_for_reset().
2937 */
2938int usb_reset_device(struct usb_device *udev)
2939{
2940 struct usb_device *parent_hdev = udev->parent;
2941 struct usb_hub *parent_hub;
2942 struct usb_device_descriptor descriptor = udev->descriptor;
2943 struct usb_hub *hub = NULL;
2944 int i, ret = 0, port1 = -1;
2945
2946 if (udev->state == USB_STATE_NOTATTACHED ||
2947 udev->state == USB_STATE_SUSPENDED) {
2948 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2949 udev->state);
2950 return -EINVAL;
2951 }
2952
2953 if (!parent_hdev) {
2954 /* this requires hcd-specific logic; see OHCI hc_restart() */
2955 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2956 return -EISDIR;
2957 }
2958
2959 for (i = 0; i < parent_hdev->maxchild; i++)
2960 if (parent_hdev->children[i] == udev) {
2961 port1 = i + 1;
2962 break;
2963 }
2964
2965 if (port1 < 0) {
2966 /* If this ever happens, it's very bad */
2967 dev_err(&udev->dev, "Can't locate device's port!\n");
2968 return -ENOENT;
2969 }
2970 parent_hub = hdev_to_hub(parent_hdev);
2971
2972 /* If we're resetting an active hub, take some special actions */
2973 if (udev->actconfig &&
2974 udev->actconfig->interface[0]->dev.driver ==
2975 &hub_driver.driver &&
2976 (hub = hdev_to_hub(udev)) != NULL) {
2977 hub_pre_reset(hub);
2978 }
2979
2980 set_bit(port1, parent_hub->busy_bits);
2981 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2982
2983 /* ep0 maxpacket size may change; let the HCD know about it.
2984 * Other endpoints will be handled by re-enumeration. */
2985 ep0_reinit(udev);
2986 ret = hub_port_init(parent_hub, udev, port1, i);
2987 if (ret >= 0)
2988 break;
2989 }
2990 clear_bit(port1, parent_hub->busy_bits);
2991 if (ret < 0)
2992 goto re_enumerate;
2993
2994 /* Device might have changed firmware (DFU or similar) */
2995 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
2996 || config_descriptors_changed (udev)) {
2997 dev_info(&udev->dev, "device firmware changed\n");
2998 udev->descriptor = descriptor; /* for disconnect() calls */
2999 goto re_enumerate;
3000 }
3001
3002 if (!udev->actconfig)
3003 goto done;
3004
3005 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3006 USB_REQ_SET_CONFIGURATION, 0,
3007 udev->actconfig->desc.bConfigurationValue, 0,
3008 NULL, 0, USB_CTRL_SET_TIMEOUT);
3009 if (ret < 0) {
3010 dev_err(&udev->dev,
3011 "can't restore configuration #%d (error=%d)\n",
3012 udev->actconfig->desc.bConfigurationValue, ret);
3013 goto re_enumerate;
3014 }
3015 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3016
3017 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3018 struct usb_interface *intf = udev->actconfig->interface[i];
3019 struct usb_interface_descriptor *desc;
3020
3021 /* set_interface resets host side toggle even
3022 * for altsetting zero. the interface may have no driver.
3023 */
3024 desc = &intf->cur_altsetting->desc;
3025 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3026 desc->bAlternateSetting);
3027 if (ret < 0) {
3028 dev_err(&udev->dev, "failed to restore interface %d "
3029 "altsetting %d (error=%d)\n",
3030 desc->bInterfaceNumber,
3031 desc->bAlternateSetting,
3032 ret);
3033 goto re_enumerate;
3034 }
3035 }
3036
3037done:
3038 if (hub)
3039 hub_post_reset(hub);
3040 return 0;
3041
3042re_enumerate:
3043 hub_port_logical_disconnect(parent_hub, port1);
3044 return -ENODEV;
3045}
Clone of davem's net-next-2.6 tree