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kbuild: document howto build external modules using several directories
[linux-2.6/verdex.git] / drivers / usb / core / hub.c
blob650d5ee5871b2f1e6c3f8d7f628c11cd91bed2b1
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 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/completion.h>
17 #include <linux/sched.h>
18 #include <linux/list.h>
19 #include <linux/slab.h>
20 #include <linux/smp_lock.h>
21 #include <linux/ioctl.h>
22 #include <linux/usb.h>
23 #include <linux/usbdevice_fs.h>
24 #include <linux/kthread.h>
25
26 #include <asm/semaphore.h>
27 #include <asm/uaccess.h>
28 #include <asm/byteorder.h>
29
30 #include "usb.h"
31 #include "hcd.h"
32 #include "hub.h"
33
34 /* Protect struct usb_device->state and ->children members
35 * Note: Both are also protected by ->dev.sem, except that ->state can
36 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
37 static DEFINE_SPINLOCK(device_state_lock);
38
39 /* khubd's worklist and its lock */
40 static DEFINE_SPINLOCK(hub_event_lock);
41 static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
42
43 /* Wakes up khubd */
44 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
45
46 static struct task_struct *khubd_task;
47
48 /* cycle leds on hubs that aren't blinking for attention */
49 static int blinkenlights = 0;
50 module_param (blinkenlights, bool, S_IRUGO);
51 MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
52
53 /*
54 * As of 2.6.10 we introduce a new USB device initialization scheme which
55 * closely resembles the way Windows works. Hopefully it will be compatible
56 * with a wider range of devices than the old scheme. However some previously
57 * working devices may start giving rise to "device not accepting address"
58 * errors; if that happens the user can try the old scheme by adjusting the
59 * following module parameters.
60 *
61 * For maximum flexibility there are two boolean parameters to control the
62 * hub driver's behavior. On the first initialization attempt, if the
63 * "old_scheme_first" parameter is set then the old scheme will be used,
64 * otherwise the new scheme is used. If that fails and "use_both_schemes"
65 * is set, then the driver will make another attempt, using the other scheme.
66 */
67 static int old_scheme_first = 0;
68 module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
69 MODULE_PARM_DESC(old_scheme_first,
70 "start with the old device initialization scheme");
71
72 static int use_both_schemes = 1;
73 module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
74 MODULE_PARM_DESC(use_both_schemes,
75 "try the other device initialization scheme if the "
76 "first one fails");
77
78
79 #ifdef DEBUG
80 static inline char *portspeed (int portstatus)
81 {
82 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
83 return "480 Mb/s";
84 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
85 return "1.5 Mb/s";
86 else
87 return "12 Mb/s";
88 }
89 #endif
90
91 /* Note that hdev or one of its children must be locked! */
92 static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
93 {
94 return usb_get_intfdata(hdev->actconfig->interface[0]);
95 }
96
97 /* USB 2.0 spec Section 11.24.4.5 */
98 static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
99 {
100 int i, ret;
101
102 for (i = 0; i < 3; i++) {
103 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
104 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
105 USB_DT_HUB << 8, 0, data, size,
106 USB_CTRL_GET_TIMEOUT);
107 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
108 return ret;
109 }
110 return -EINVAL;
111 }
112
113 /*
114 * USB 2.0 spec Section 11.24.2.1
115 */
116 static int clear_hub_feature(struct usb_device *hdev, int feature)
117 {
118 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
119 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
120 }
121
122 /*
123 * USB 2.0 spec Section 11.24.2.2
124 */
125 static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
126 {
127 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
128 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
129 NULL, 0, 1000);
130 }
131
132 /*
133 * USB 2.0 spec Section 11.24.2.13
134 */
135 static int set_port_feature(struct usb_device *hdev, int port1, int feature)
136 {
137 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
138 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
139 NULL, 0, 1000);
140 }
141
142 /*
143 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
144 * for info about using port indicators
145 */
146 static void set_port_led(
147 struct usb_hub *hub,
148 int port1,
149 int selector
150 )
151 {
152 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
153 USB_PORT_FEAT_INDICATOR);
154 if (status < 0)
155 dev_dbg (hub->intfdev,
156 "port %d indicator %s status %d\n",
157 port1,
158 ({ char *s; switch (selector) {
159 case HUB_LED_AMBER: s = "amber"; break;
160 case HUB_LED_GREEN: s = "green"; break;
161 case HUB_LED_OFF: s = "off"; break;
162 case HUB_LED_AUTO: s = "auto"; break;
163 default: s = "??"; break;
164 }; s; }),
165 status);
166 }
167
168 #define LED_CYCLE_PERIOD ((2*HZ)/3)
169
170 static void led_work (void *__hub)
171 {
172 struct usb_hub *hub = __hub;
173 struct usb_device *hdev = hub->hdev;
174 unsigned i;
175 unsigned changed = 0;
176 int cursor = -1;
177
178 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
179 return;
180
181 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
182 unsigned selector, mode;
183
184 /* 30%-50% duty cycle */
185
186 switch (hub->indicator[i]) {
187 /* cycle marker */
188 case INDICATOR_CYCLE:
189 cursor = i;
190 selector = HUB_LED_AUTO;
191 mode = INDICATOR_AUTO;
192 break;
193 /* blinking green = sw attention */
194 case INDICATOR_GREEN_BLINK:
195 selector = HUB_LED_GREEN;
196 mode = INDICATOR_GREEN_BLINK_OFF;
197 break;
198 case INDICATOR_GREEN_BLINK_OFF:
199 selector = HUB_LED_OFF;
200 mode = INDICATOR_GREEN_BLINK;
201 break;
202 /* blinking amber = hw attention */
203 case INDICATOR_AMBER_BLINK:
204 selector = HUB_LED_AMBER;
205 mode = INDICATOR_AMBER_BLINK_OFF;
206 break;
207 case INDICATOR_AMBER_BLINK_OFF:
208 selector = HUB_LED_OFF;
209 mode = INDICATOR_AMBER_BLINK;
210 break;
211 /* blink green/amber = reserved */
212 case INDICATOR_ALT_BLINK:
213 selector = HUB_LED_GREEN;
214 mode = INDICATOR_ALT_BLINK_OFF;
215 break;
216 case INDICATOR_ALT_BLINK_OFF:
217 selector = HUB_LED_AMBER;
218 mode = INDICATOR_ALT_BLINK;
219 break;
220 default:
221 continue;
222 }
223 if (selector != HUB_LED_AUTO)
224 changed = 1;
225 set_port_led(hub, i + 1, selector);
226 hub->indicator[i] = mode;
227 }
228 if (!changed && blinkenlights) {
229 cursor++;
230 cursor %= hub->descriptor->bNbrPorts;
231 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
232 hub->indicator[cursor] = INDICATOR_CYCLE;
233 changed++;
234 }
235 if (changed)
236 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
237 }
238
239 /* use a short timeout for hub/port status fetches */
240 #define USB_STS_TIMEOUT 1000
241 #define USB_STS_RETRIES 5
242
243 /*
244 * USB 2.0 spec Section 11.24.2.6
245 */
246 static int get_hub_status(struct usb_device *hdev,
247 struct usb_hub_status *data)
248 {
249 int i, status = -ETIMEDOUT;
250
251 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
252 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
253 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
254 data, sizeof(*data), USB_STS_TIMEOUT);
255 }
256 return status;
257 }
258
259 /*
260 * USB 2.0 spec Section 11.24.2.7
261 */
262 static int get_port_status(struct usb_device *hdev, int port1,
263 struct usb_port_status *data)
264 {
265 int i, status = -ETIMEDOUT;
266
267 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
268 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
269 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
270 data, sizeof(*data), USB_STS_TIMEOUT);
271 }
272 return status;
273 }
274
275 static void kick_khubd(struct usb_hub *hub)
276 {
277 unsigned long flags;
278
279 spin_lock_irqsave(&hub_event_lock, flags);
280 if (list_empty(&hub->event_list)) {
281 list_add_tail(&hub->event_list, &hub_event_list);
282 wake_up(&khubd_wait);
283 }
284 spin_unlock_irqrestore(&hub_event_lock, flags);
285 }
286
287 void usb_kick_khubd(struct usb_device *hdev)
288 {
289 kick_khubd(hdev_to_hub(hdev));
290 }
291
292
293 /* completion function, fires on port status changes and various faults */
294 static void hub_irq(struct urb *urb, struct pt_regs *regs)
295 {
296 struct usb_hub *hub = (struct usb_hub *)urb->context;
297 int status;
298 int i;
299 unsigned long bits;
300
301 switch (urb->status) {
302 case -ENOENT: /* synchronous unlink */
303 case -ECONNRESET: /* async unlink */
304 case -ESHUTDOWN: /* hardware going away */
305 return;
306
307 default: /* presumably an error */
308 /* Cause a hub reset after 10 consecutive errors */
309 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
310 if ((++hub->nerrors < 10) || hub->error)
311 goto resubmit;
312 hub->error = urb->status;
313 /* FALL THROUGH */
314
315 /* let khubd handle things */
316 case 0: /* we got data: port status changed */
317 bits = 0;
318 for (i = 0; i < urb->actual_length; ++i)
319 bits |= ((unsigned long) ((*hub->buffer)[i]))
320 << (i*8);
321 hub->event_bits[0] = bits;
322 break;
323 }
324
325 hub->nerrors = 0;
326
327 /* Something happened, let khubd figure it out */
328 kick_khubd(hub);
329
330 resubmit:
331 if (hub->quiescing)
332 return;
333
334 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
335 && status != -ENODEV && status != -EPERM)
336 dev_err (hub->intfdev, "resubmit --> %d\n", status);
337 }
338
339 /* USB 2.0 spec Section 11.24.2.3 */
340 static inline int
341 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
342 {
343 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
344 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
345 tt, NULL, 0, 1000);
346 }
347
348 /*
349 * enumeration blocks khubd for a long time. we use keventd instead, since
350 * long blocking there is the exception, not the rule. accordingly, HCDs
351 * talking to TTs must queue control transfers (not just bulk and iso), so
352 * both can talk to the same hub concurrently.
353 */
354 static void hub_tt_kevent (void *arg)
355 {
356 struct usb_hub *hub = arg;
357 unsigned long flags;
358
359 spin_lock_irqsave (&hub->tt.lock, flags);
360 while (!list_empty (&hub->tt.clear_list)) {
361 struct list_head *temp;
362 struct usb_tt_clear *clear;
363 struct usb_device *hdev = hub->hdev;
364 int status;
365
366 temp = hub->tt.clear_list.next;
367 clear = list_entry (temp, struct usb_tt_clear, clear_list);
368 list_del (&clear->clear_list);
369
370 /* drop lock so HCD can concurrently report other TT errors */
371 spin_unlock_irqrestore (&hub->tt.lock, flags);
372 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
373 spin_lock_irqsave (&hub->tt.lock, flags);
374
375 if (status)
376 dev_err (&hdev->dev,
377 "clear tt %d (%04x) error %d\n",
378 clear->tt, clear->devinfo, status);
379 kfree(clear);
380 }
381 spin_unlock_irqrestore (&hub->tt.lock, flags);
382 }
383
384 /**
385 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
386 * @udev: the device whose split transaction failed
387 * @pipe: identifies the endpoint of the failed transaction
388 *
389 * High speed HCDs use this to tell the hub driver that some split control or
390 * bulk transaction failed in a way that requires clearing internal state of
391 * a transaction translator. This is normally detected (and reported) from
392 * interrupt context.
393 *
394 * It may not be possible for that hub to handle additional full (or low)
395 * speed transactions until that state is fully cleared out.
396 */
397 void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
398 {
399 struct usb_tt *tt = udev->tt;
400 unsigned long flags;
401 struct usb_tt_clear *clear;
402
403 /* we've got to cope with an arbitrary number of pending TT clears,
404 * since each TT has "at least two" buffers that can need it (and
405 * there can be many TTs per hub). even if they're uncommon.
406 */
407 if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) {
408 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
409 /* FIXME recover somehow ... RESET_TT? */
410 return;
411 }
412
413 /* info that CLEAR_TT_BUFFER needs */
414 clear->tt = tt->multi ? udev->ttport : 1;
415 clear->devinfo = usb_pipeendpoint (pipe);
416 clear->devinfo |= udev->devnum << 4;
417 clear->devinfo |= usb_pipecontrol (pipe)
418 ? (USB_ENDPOINT_XFER_CONTROL << 11)
419 : (USB_ENDPOINT_XFER_BULK << 11);
420 if (usb_pipein (pipe))
421 clear->devinfo |= 1 << 15;
422
423 /* tell keventd to clear state for this TT */
424 spin_lock_irqsave (&tt->lock, flags);
425 list_add_tail (&clear->clear_list, &tt->clear_list);
426 schedule_work (&tt->kevent);
427 spin_unlock_irqrestore (&tt->lock, flags);
428 }
429
430 static void hub_power_on(struct usb_hub *hub)
431 {
432 int port1;
433 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
434 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
435
436 /* if hub supports power switching, enable power on each port */
437 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) {
438 dev_dbg(hub->intfdev, "enabling power on all ports\n");
439 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
440 set_port_feature(hub->hdev, port1,
441 USB_PORT_FEAT_POWER);
442 }
443
444 /* Wait at least 100 msec for power to become stable */
445 msleep(max(pgood_delay, (unsigned) 100));
446 }
447
448 static inline void __hub_quiesce(struct usb_hub *hub)
449 {
450 /* (nonblocking) khubd and related activity won't re-trigger */
451 hub->quiescing = 1;
452 hub->activating = 0;
453 hub->resume_root_hub = 0;
454 }
455
456 static void hub_quiesce(struct usb_hub *hub)
457 {
458 /* (blocking) stop khubd and related activity */
459 __hub_quiesce(hub);
460 usb_kill_urb(hub->urb);
461 if (hub->has_indicators)
462 cancel_delayed_work(&hub->leds);
463 if (hub->has_indicators || hub->tt.hub)
464 flush_scheduled_work();
465 }
466
467 static void hub_activate(struct usb_hub *hub)
468 {
469 int status;
470
471 hub->quiescing = 0;
472 hub->activating = 1;
473 hub->resume_root_hub = 0;
474 status = usb_submit_urb(hub->urb, GFP_NOIO);
475 if (status < 0)
476 dev_err(hub->intfdev, "activate --> %d\n", status);
477 if (hub->has_indicators && blinkenlights)
478 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
479
480 /* scan all ports ASAP */
481 kick_khubd(hub);
482 }
483
484 static int hub_hub_status(struct usb_hub *hub,
485 u16 *status, u16 *change)
486 {
487 int ret;
488
489 ret = get_hub_status(hub->hdev, &hub->status->hub);
490 if (ret < 0)
491 dev_err (hub->intfdev,
492 "%s failed (err = %d)\n", __FUNCTION__, ret);
493 else {
494 *status = le16_to_cpu(hub->status->hub.wHubStatus);
495 *change = le16_to_cpu(hub->status->hub.wHubChange);
496 ret = 0;
497 }
498 return ret;
499 }
500
501 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
502 {
503 struct usb_device *hdev = hub->hdev;
504 int ret;
505
506 if (hdev->children[port1-1] && set_state) {
507 usb_set_device_state(hdev->children[port1-1],
508 USB_STATE_NOTATTACHED);
509 }
510 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
511 if (ret)
512 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
513 port1, ret);
514
515 return ret;
516 }
517
518
519 /* caller has locked the hub device */
520 static void hub_pre_reset(struct usb_hub *hub, int disable_ports)
521 {
522 struct usb_device *hdev = hub->hdev;
523 int port1;
524
525 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
526 if (hdev->children[port1 - 1]) {
527 usb_disconnect(&hdev->children[port1 - 1]);
528 if (disable_ports)
529 hub_port_disable(hub, port1, 0);
530 }
531 }
532 hub_quiesce(hub);
533 }
534
535 /* caller has locked the hub device */
536 static void hub_post_reset(struct usb_hub *hub)
537 {
538 hub_activate(hub);
539 hub_power_on(hub);
540 }
541
542
543 static int hub_configure(struct usb_hub *hub,
544 struct usb_endpoint_descriptor *endpoint)
545 {
546 struct usb_device *hdev = hub->hdev;
547 struct device *hub_dev = hub->intfdev;
548 u16 hubstatus, hubchange;
549 u16 wHubCharacteristics;
550 unsigned int pipe;
551 int maxp, ret;
552 char *message;
553
554 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
555 &hub->buffer_dma);
556 if (!hub->buffer) {
557 message = "can't allocate hub irq buffer";
558 ret = -ENOMEM;
559 goto fail;
560 }
561
562 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
563 if (!hub->status) {
564 message = "can't kmalloc hub status buffer";
565 ret = -ENOMEM;
566 goto fail;
567 }
568
569 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
570 if (!hub->descriptor) {
571 message = "can't kmalloc hub descriptor";
572 ret = -ENOMEM;
573 goto fail;
574 }
575
576 /* Request the entire hub descriptor.
577 * hub->descriptor can handle USB_MAXCHILDREN ports,
578 * but the hub can/will return fewer bytes here.
579 */
580 ret = get_hub_descriptor(hdev, hub->descriptor,
581 sizeof(*hub->descriptor));
582 if (ret < 0) {
583 message = "can't read hub descriptor";
584 goto fail;
585 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
586 message = "hub has too many ports!";
587 ret = -ENODEV;
588 goto fail;
589 }
590
591 hdev->maxchild = hub->descriptor->bNbrPorts;
592 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
593 (hdev->maxchild == 1) ? "" : "s");
594
595 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
596
597 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
598 int i;
599 char portstr [USB_MAXCHILDREN + 1];
600
601 for (i = 0; i < hdev->maxchild; i++)
602 portstr[i] = hub->descriptor->DeviceRemovable
603 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
604 ? 'F' : 'R';
605 portstr[hdev->maxchild] = 0;
606 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
607 } else
608 dev_dbg(hub_dev, "standalone hub\n");
609
610 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
611 case 0x00:
612 dev_dbg(hub_dev, "ganged power switching\n");
613 break;
614 case 0x01:
615 dev_dbg(hub_dev, "individual port power switching\n");
616 break;
617 case 0x02:
618 case 0x03:
619 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
620 break;
621 }
622
623 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
624 case 0x00:
625 dev_dbg(hub_dev, "global over-current protection\n");
626 break;
627 case 0x08:
628 dev_dbg(hub_dev, "individual port over-current protection\n");
629 break;
630 case 0x10:
631 case 0x18:
632 dev_dbg(hub_dev, "no over-current protection\n");
633 break;
634 }
635
636 spin_lock_init (&hub->tt.lock);
637 INIT_LIST_HEAD (&hub->tt.clear_list);
638 INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
639 switch (hdev->descriptor.bDeviceProtocol) {
640 case 0:
641 break;
642 case 1:
643 dev_dbg(hub_dev, "Single TT\n");
644 hub->tt.hub = hdev;
645 break;
646 case 2:
647 ret = usb_set_interface(hdev, 0, 1);
648 if (ret == 0) {
649 dev_dbg(hub_dev, "TT per port\n");
650 hub->tt.multi = 1;
651 } else
652 dev_err(hub_dev, "Using single TT (err %d)\n",
653 ret);
654 hub->tt.hub = hdev;
655 break;
656 default:
657 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
658 hdev->descriptor.bDeviceProtocol);
659 break;
660 }
661
662 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
663 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
664 case HUB_TTTT_8_BITS:
665 if (hdev->descriptor.bDeviceProtocol != 0) {
666 hub->tt.think_time = 666;
667 dev_dbg(hub_dev, "TT requires at most %d "
668 "FS bit times (%d ns)\n",
669 8, hub->tt.think_time);
670 }
671 break;
672 case HUB_TTTT_16_BITS:
673 hub->tt.think_time = 666 * 2;
674 dev_dbg(hub_dev, "TT requires at most %d "
675 "FS bit times (%d ns)\n",
676 16, hub->tt.think_time);
677 break;
678 case HUB_TTTT_24_BITS:
679 hub->tt.think_time = 666 * 3;
680 dev_dbg(hub_dev, "TT requires at most %d "
681 "FS bit times (%d ns)\n",
682 24, hub->tt.think_time);
683 break;
684 case HUB_TTTT_32_BITS:
685 hub->tt.think_time = 666 * 4;
686 dev_dbg(hub_dev, "TT requires at most %d "
687 "FS bit times (%d ns)\n",
688 32, hub->tt.think_time);
689 break;
690 }
691
692 /* probe() zeroes hub->indicator[] */
693 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
694 hub->has_indicators = 1;
695 dev_dbg(hub_dev, "Port indicators are supported\n");
696 }
697
698 dev_dbg(hub_dev, "power on to power good time: %dms\n",
699 hub->descriptor->bPwrOn2PwrGood * 2);
700
701 /* power budgeting mostly matters with bus-powered hubs,
702 * and battery-powered root hubs (may provide just 8 mA).
703 */
704 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
705 if (ret < 2) {
706 message = "can't get hub status";
707 goto fail;
708 }
709 le16_to_cpus(&hubstatus);
710 if (hdev == hdev->bus->root_hub) {
711 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
712 hub->mA_per_port = 500;
713 else {
714 hub->mA_per_port = hdev->bus_mA;
715 hub->limited_power = 1;
716 }
717 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
718 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
719 hub->descriptor->bHubContrCurrent);
720 hub->limited_power = 1;
721 if (hdev->maxchild > 0) {
722 int remaining = hdev->bus_mA -
723 hub->descriptor->bHubContrCurrent;
724
725 if (remaining < hdev->maxchild * 100)
726 dev_warn(hub_dev,
727 "insufficient power available "
728 "to use all downstream ports\n");
729 hub->mA_per_port = 100; /* 7.2.1.1 */
730 }
731 } else { /* Self-powered external hub */
732 /* FIXME: What about battery-powered external hubs that
733 * provide less current per port? */
734 hub->mA_per_port = 500;
735 }
736 if (hub->mA_per_port < 500)
737 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
738 hub->mA_per_port);
739
740 ret = hub_hub_status(hub, &hubstatus, &hubchange);
741 if (ret < 0) {
742 message = "can't get hub status";
743 goto fail;
744 }
745
746 /* local power status reports aren't always correct */
747 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
748 dev_dbg(hub_dev, "local power source is %s\n",
749 (hubstatus & HUB_STATUS_LOCAL_POWER)
750 ? "lost (inactive)" : "good");
751
752 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
753 dev_dbg(hub_dev, "%sover-current condition exists\n",
754 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
755
756 /* set up the interrupt endpoint */
757 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
758 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
759
760 if (maxp > sizeof(*hub->buffer))
761 maxp = sizeof(*hub->buffer);
762
763 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
764 if (!hub->urb) {
765 message = "couldn't allocate interrupt urb";
766 ret = -ENOMEM;
767 goto fail;
768 }
769
770 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
771 hub, endpoint->bInterval);
772 hub->urb->transfer_dma = hub->buffer_dma;
773 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
774
775 /* maybe cycle the hub leds */
776 if (hub->has_indicators && blinkenlights)
777 hub->indicator [0] = INDICATOR_CYCLE;
778
779 hub_power_on(hub);
780 hub_activate(hub);
781 return 0;
782
783 fail:
784 dev_err (hub_dev, "config failed, %s (err %d)\n",
785 message, ret);
786 /* hub_disconnect() frees urb and descriptor */
787 return ret;
788 }
789
790 static unsigned highspeed_hubs;
791
792 static void hub_disconnect(struct usb_interface *intf)
793 {
794 struct usb_hub *hub = usb_get_intfdata (intf);
795 struct usb_device *hdev;
796
797 usb_set_intfdata (intf, NULL);
798 hdev = hub->hdev;
799
800 if (hdev->speed == USB_SPEED_HIGH)
801 highspeed_hubs--;
802
803 /* Disconnect all children and quiesce the hub */
804 hub_pre_reset(hub, 1);
805
806 usb_free_urb(hub->urb);
807 hub->urb = NULL;
808
809 spin_lock_irq(&hub_event_lock);
810 list_del_init(&hub->event_list);
811 spin_unlock_irq(&hub_event_lock);
812
813 kfree(hub->descriptor);
814 hub->descriptor = NULL;
815
816 kfree(hub->status);
817 hub->status = NULL;
818
819 if (hub->buffer) {
820 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
821 hub->buffer_dma);
822 hub->buffer = NULL;
823 }
824
825 kfree(hub);
826 }
827
828 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
829 {
830 struct usb_host_interface *desc;
831 struct usb_endpoint_descriptor *endpoint;
832 struct usb_device *hdev;
833 struct usb_hub *hub;
834
835 desc = intf->cur_altsetting;
836 hdev = interface_to_usbdev(intf);
837
838 /* Some hubs have a subclass of 1, which AFAICT according to the */
839 /* specs is not defined, but it works */
840 if ((desc->desc.bInterfaceSubClass != 0) &&
841 (desc->desc.bInterfaceSubClass != 1)) {
842 descriptor_error:
843 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
844 return -EIO;
845 }
846
847 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
848 if (desc->desc.bNumEndpoints != 1)
849 goto descriptor_error;
850
851 endpoint = &desc->endpoint[0].desc;
852
853 /* Output endpoint? Curiouser and curiouser.. */
854 if (!(endpoint->bEndpointAddress & USB_DIR_IN))
855 goto descriptor_error;
856
857 /* If it's not an interrupt endpoint, we'd better punt! */
858 if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
859 != USB_ENDPOINT_XFER_INT)
860 goto descriptor_error;
861
862 /* We found a hub */
863 dev_info (&intf->dev, "USB hub found\n");
864
865 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
866 if (!hub) {
867 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
868 return -ENOMEM;
869 }
870
871 INIT_LIST_HEAD(&hub->event_list);
872 hub->intfdev = &intf->dev;
873 hub->hdev = hdev;
874 INIT_WORK(&hub->leds, led_work, hub);
875
876 usb_set_intfdata (intf, hub);
877
878 if (hdev->speed == USB_SPEED_HIGH)
879 highspeed_hubs++;
880
881 if (hub_configure(hub, endpoint) >= 0)
882 return 0;
883
884 hub_disconnect (intf);
885 return -ENODEV;
886 }
887
888 static int
889 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
890 {
891 struct usb_device *hdev = interface_to_usbdev (intf);
892
893 /* assert ifno == 0 (part of hub spec) */
894 switch (code) {
895 case USBDEVFS_HUB_PORTINFO: {
896 struct usbdevfs_hub_portinfo *info = user_data;
897 int i;
898
899 spin_lock_irq(&device_state_lock);
900 if (hdev->devnum <= 0)
901 info->nports = 0;
902 else {
903 info->nports = hdev->maxchild;
904 for (i = 0; i < info->nports; i++) {
905 if (hdev->children[i] == NULL)
906 info->port[i] = 0;
907 else
908 info->port[i] =
909 hdev->children[i]->devnum;
910 }
911 }
912 spin_unlock_irq(&device_state_lock);
913
914 return info->nports + 1;
915 }
916
917 default:
918 return -ENOSYS;
919 }
920 }
921
922
923 /* grab device/port lock, returning index of that port (zero based).
924 * protects the upstream link used by this device from concurrent
925 * tree operations like suspend, resume, reset, and disconnect, which
926 * apply to everything downstream of a given port.
927 */
928 static int locktree(struct usb_device *udev)
929 {
930 int t;
931 struct usb_device *hdev;
932
933 if (!udev)
934 return -ENODEV;
935
936 /* root hub is always the first lock in the series */
937 hdev = udev->parent;
938 if (!hdev) {
939 usb_lock_device(udev);
940 return 0;
941 }
942
943 /* on the path from root to us, lock everything from
944 * top down, dropping parent locks when not needed
945 */
946 t = locktree(hdev);
947 if (t < 0)
948 return t;
949
950 /* everything is fail-fast once disconnect
951 * processing starts
952 */
953 if (udev->state == USB_STATE_NOTATTACHED) {
954 usb_unlock_device(hdev);
955 return -ENODEV;
956 }
957
958 /* when everyone grabs locks top->bottom,
959 * non-overlapping work may be concurrent
960 */
961 usb_lock_device(udev);
962 usb_unlock_device(hdev);
963 return udev->portnum;
964 }
965
966 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
967 {
968 int i;
969
970 for (i = 0; i < udev->maxchild; ++i) {
971 if (udev->children[i])
972 recursively_mark_NOTATTACHED(udev->children[i]);
973 }
974 udev->state = USB_STATE_NOTATTACHED;
975 }
976
977 /**
978 * usb_set_device_state - change a device's current state (usbcore, hcds)
979 * @udev: pointer to device whose state should be changed
980 * @new_state: new state value to be stored
981 *
982 * udev->state is _not_ fully protected by the device lock. Although
983 * most transitions are made only while holding the lock, the state can
984 * can change to USB_STATE_NOTATTACHED at almost any time. This
985 * is so that devices can be marked as disconnected as soon as possible,
986 * without having to wait for any semaphores to be released. As a result,
987 * all changes to any device's state must be protected by the
988 * device_state_lock spinlock.
989 *
990 * Once a device has been added to the device tree, all changes to its state
991 * should be made using this routine. The state should _not_ be set directly.
992 *
993 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
994 * Otherwise udev->state is set to new_state, and if new_state is
995 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
996 * to USB_STATE_NOTATTACHED.
997 */
998 void usb_set_device_state(struct usb_device *udev,
999 enum usb_device_state new_state)
1000 {
1001 unsigned long flags;
1002
1003 spin_lock_irqsave(&device_state_lock, flags);
1004 if (udev->state == USB_STATE_NOTATTACHED)
1005 ; /* do nothing */
1006 else if (new_state != USB_STATE_NOTATTACHED) {
1007 udev->state = new_state;
1008 if (new_state == USB_STATE_CONFIGURED)
1009 device_init_wakeup(&udev->dev,
1010 (udev->actconfig->desc.bmAttributes
1011 & USB_CONFIG_ATT_WAKEUP));
1012 else if (new_state != USB_STATE_SUSPENDED)
1013 device_init_wakeup(&udev->dev, 0);
1014 } else
1015 recursively_mark_NOTATTACHED(udev);
1016 spin_unlock_irqrestore(&device_state_lock, flags);
1017 }
1018 EXPORT_SYMBOL(usb_set_device_state);
1019
1020
1021 #ifdef CONFIG_PM
1022
1023 /**
1024 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1025 * @rhdev: struct usb_device for the root hub
1026 *
1027 * The USB host controller driver calls this function when its root hub
1028 * is resumed and Vbus power has been interrupted or the controller
1029 * has been reset. The routine marks all the children of the root hub
1030 * as NOTATTACHED and marks logical connect-change events on their ports.
1031 */
1032 void usb_root_hub_lost_power(struct usb_device *rhdev)
1033 {
1034 struct usb_hub *hub;
1035 int port1;
1036 unsigned long flags;
1037
1038 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
1039 spin_lock_irqsave(&device_state_lock, flags);
1040 hub = hdev_to_hub(rhdev);
1041 for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
1042 if (rhdev->children[port1 - 1]) {
1043 recursively_mark_NOTATTACHED(
1044 rhdev->children[port1 - 1]);
1045 set_bit(port1, hub->change_bits);
1046 }
1047 }
1048 spin_unlock_irqrestore(&device_state_lock, flags);
1049 }
1050 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1051
1052 #endif
1053
1054 static void choose_address(struct usb_device *udev)
1055 {
1056 int devnum;
1057 struct usb_bus *bus = udev->bus;
1058
1059 /* If khubd ever becomes multithreaded, this will need a lock */
1060
1061 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1062 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1063 bus->devnum_next);
1064 if (devnum >= 128)
1065 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1066
1067 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1068
1069 if (devnum < 128) {
1070 set_bit(devnum, bus->devmap.devicemap);
1071 udev->devnum = devnum;
1072 }
1073 }
1074
1075 static void release_address(struct usb_device *udev)
1076 {
1077 if (udev->devnum > 0) {
1078 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1079 udev->devnum = -1;
1080 }
1081 }
1082
1083 /**
1084 * usb_disconnect - disconnect a device (usbcore-internal)
1085 * @pdev: pointer to device being disconnected
1086 * Context: !in_interrupt ()
1087 *
1088 * Something got disconnected. Get rid of it and all of its children.
1089 *
1090 * If *pdev is a normal device then the parent hub must already be locked.
1091 * If *pdev is a root hub then this routine will acquire the
1092 * usb_bus_list_lock on behalf of the caller.
1093 *
1094 * Only hub drivers (including virtual root hub drivers for host
1095 * controllers) should ever call this.
1096 *
1097 * This call is synchronous, and may not be used in an interrupt context.
1098 */
1099 void usb_disconnect(struct usb_device **pdev)
1100 {
1101 struct usb_device *udev = *pdev;
1102 int i;
1103
1104 if (!udev) {
1105 pr_debug ("%s nodev\n", __FUNCTION__);
1106 return;
1107 }
1108
1109 /* mark the device as inactive, so any further urb submissions for
1110 * this device (and any of its children) will fail immediately.
1111 * this quiesces everyting except pending urbs.
1112 */
1113 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1114 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1115
1116 usb_lock_device(udev);
1117
1118 /* Free up all the children before we remove this device */
1119 for (i = 0; i < USB_MAXCHILDREN; i++) {
1120 if (udev->children[i])
1121 usb_disconnect(&udev->children[i]);
1122 }
1123
1124 /* deallocate hcd/hardware state ... nuking all pending urbs and
1125 * cleaning up all state associated with the current configuration
1126 * so that the hardware is now fully quiesced.
1127 */
1128 usb_disable_device(udev, 0);
1129
1130 usb_notify_remove_device(udev);
1131
1132 /* Free the device number, remove the /proc/bus/usb entry and
1133 * the sysfs attributes, and delete the parent's children[]
1134 * (or root_hub) pointer.
1135 */
1136 dev_dbg (&udev->dev, "unregistering device\n");
1137 release_address(udev);
1138 usb_remove_sysfs_dev_files(udev);
1139
1140 /* Avoid races with recursively_mark_NOTATTACHED() */
1141 spin_lock_irq(&device_state_lock);
1142 *pdev = NULL;
1143 spin_unlock_irq(&device_state_lock);
1144
1145 usb_unlock_device(udev);
1146
1147 device_unregister(&udev->dev);
1148 }
1149
1150 static inline const char *plural(int n)
1151 {
1152 return (n == 1 ? "" : "s");
1153 }
1154
1155 static int choose_configuration(struct usb_device *udev)
1156 {
1157 int i;
1158 u16 devstatus;
1159 int bus_powered;
1160 int num_configs;
1161 struct usb_host_config *c, *best;
1162
1163 /* If this fails, assume the device is bus-powered */
1164 devstatus = 0;
1165 usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1166 le16_to_cpus(&devstatus);
1167 bus_powered = ((devstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0);
1168 dev_dbg(&udev->dev, "device is %s-powered\n",
1169 bus_powered ? "bus" : "self");
1170
1171 best = NULL;
1172 c = udev->config;
1173 num_configs = udev->descriptor.bNumConfigurations;
1174 for (i = 0; i < num_configs; (i++, c++)) {
1175 struct usb_interface_descriptor *desc =
1176 &c->intf_cache[0]->altsetting->desc;
1177
1178 /*
1179 * HP's USB bus-powered keyboard has only one configuration
1180 * and it claims to be self-powered; other devices may have
1181 * similar errors in their descriptors. If the next test
1182 * were allowed to execute, such configurations would always
1183 * be rejected and the devices would not work as expected.
1184 */
1185 #if 0
1186 /* Rule out self-powered configs for a bus-powered device */
1187 if (bus_powered && (c->desc.bmAttributes &
1188 USB_CONFIG_ATT_SELFPOWER))
1189 continue;
1190 #endif
1191
1192 /*
1193 * The next test may not be as effective as it should be.
1194 * Some hubs have errors in their descriptor, claiming
1195 * to be self-powered when they are really bus-powered.
1196 * We will overestimate the amount of current such hubs
1197 * make available for each port.
1198 *
1199 * This is a fairly benign sort of failure. It won't
1200 * cause us to reject configurations that we should have
1201 * accepted.
1202 */
1203
1204 /* Rule out configs that draw too much bus current */
1205 if (c->desc.bMaxPower * 2 > udev->bus_mA)
1206 continue;
1207
1208 /* If the first config's first interface is COMM/2/0xff
1209 * (MSFT RNDIS), rule it out unless Linux has host-side
1210 * RNDIS support. */
1211 if (i == 0 && desc->bInterfaceClass == USB_CLASS_COMM
1212 && desc->bInterfaceSubClass == 2
1213 && desc->bInterfaceProtocol == 0xff) {
1214 #ifndef CONFIG_USB_NET_RNDIS
1215 continue;
1216 #else
1217 best = c;
1218 #endif
1219 }
1220
1221 /* From the remaining configs, choose the first one whose
1222 * first interface is for a non-vendor-specific class.
1223 * Reason: Linux is more likely to have a class driver
1224 * than a vendor-specific driver. */
1225 else if (udev->descriptor.bDeviceClass !=
1226 USB_CLASS_VENDOR_SPEC &&
1227 desc->bInterfaceClass !=
1228 USB_CLASS_VENDOR_SPEC) {
1229 best = c;
1230 break;
1231 }
1232
1233 /* If all the remaining configs are vendor-specific,
1234 * choose the first one. */
1235 else if (!best)
1236 best = c;
1237 }
1238
1239 if (best) {
1240 i = best->desc.bConfigurationValue;
1241 dev_info(&udev->dev,
1242 "configuration #%d chosen from %d choice%s\n",
1243 i, num_configs, plural(num_configs));
1244 } else {
1245 i = -1;
1246 dev_warn(&udev->dev,
1247 "no configuration chosen from %d choice%s\n",
1248 num_configs, plural(num_configs));
1249 }
1250 return i;
1251 }
1252
1253 #ifdef DEBUG
1254 static void show_string(struct usb_device *udev, char *id, char *string)
1255 {
1256 if (!string)
1257 return;
1258 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1259 }
1260
1261 #else
1262 static inline void show_string(struct usb_device *udev, char *id, char *string)
1263 {}
1264 #endif
1265
1266
1267 #ifdef CONFIG_USB_OTG
1268 #include "otg_whitelist.h"
1269 #endif
1270
1271 /**
1272 * usb_new_device - perform initial device setup (usbcore-internal)
1273 * @udev: newly addressed device (in ADDRESS state)
1274 *
1275 * This is called with devices which have been enumerated, but not yet
1276 * configured. The device descriptor is available, but not descriptors
1277 * for any device configuration. The caller must have locked either
1278 * the parent hub (if udev is a normal device) or else the
1279 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1280 * udev has already been installed, but udev is not yet visible through
1281 * sysfs or other filesystem code.
1282 *
1283 * Returns 0 for success (device is configured and listed, with its
1284 * interfaces, in sysfs); else a negative errno value.
1285 *
1286 * This call is synchronous, and may not be used in an interrupt context.
1287 *
1288 * Only the hub driver or root-hub registrar should ever call this.
1289 */
1290 int usb_new_device(struct usb_device *udev)
1291 {
1292 int err;
1293 int c;
1294
1295 err = usb_get_configuration(udev);
1296 if (err < 0) {
1297 dev_err(&udev->dev, "can't read configurations, error %d\n",
1298 err);
1299 goto fail;
1300 }
1301
1302 /* read the standard strings and cache them if present */
1303 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1304 udev->manufacturer = usb_cache_string(udev,
1305 udev->descriptor.iManufacturer);
1306 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1307
1308 /* Tell the world! */
1309 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1310 "SerialNumber=%d\n",
1311 udev->descriptor.iManufacturer,
1312 udev->descriptor.iProduct,
1313 udev->descriptor.iSerialNumber);
1314 show_string(udev, "Product", udev->product);
1315 show_string(udev, "Manufacturer", udev->manufacturer);
1316 show_string(udev, "SerialNumber", udev->serial);
1317
1318 #ifdef CONFIG_USB_OTG
1319 /*
1320 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1321 * to wake us after we've powered off VBUS; and HNP, switching roles
1322 * "host" to "peripheral". The OTG descriptor helps figure this out.
1323 */
1324 if (!udev->bus->is_b_host
1325 && udev->config
1326 && udev->parent == udev->bus->root_hub) {
1327 struct usb_otg_descriptor *desc = 0;
1328 struct usb_bus *bus = udev->bus;
1329
1330 /* descriptor may appear anywhere in config */
1331 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1332 le16_to_cpu(udev->config[0].desc.wTotalLength),
1333 USB_DT_OTG, (void **) &desc) == 0) {
1334 if (desc->bmAttributes & USB_OTG_HNP) {
1335 unsigned port1 = udev->portnum;
1336 struct usb_device *root = udev->parent;
1337
1338 dev_info(&udev->dev,
1339 "Dual-Role OTG device on %sHNP port\n",
1340 (port1 == bus->otg_port)
1341 ? "" : "non-");
1342
1343 /* enable HNP before suspend, it's simpler */
1344 if (port1 == bus->otg_port)
1345 bus->b_hnp_enable = 1;
1346 err = usb_control_msg(udev,
1347 usb_sndctrlpipe(udev, 0),
1348 USB_REQ_SET_FEATURE, 0,
1349 bus->b_hnp_enable
1350 ? USB_DEVICE_B_HNP_ENABLE
1351 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1352 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1353 if (err < 0) {
1354 /* OTG MESSAGE: report errors here,
1355 * customize to match your product.
1356 */
1357 dev_info(&udev->dev,
1358 "can't set HNP mode; %d\n",
1359 err);
1360 bus->b_hnp_enable = 0;
1361 }
1362 }
1363 }
1364 }
1365
1366 if (!is_targeted(udev)) {
1367
1368 /* Maybe it can talk to us, though we can't talk to it.
1369 * (Includes HNP test device.)
1370 */
1371 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1372 static int __usb_suspend_device(struct usb_device *,
1373 int port1);
1374 err = __usb_suspend_device(udev, udev->bus->otg_port);
1375 if (err < 0)
1376 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1377 }
1378 err = -ENODEV;
1379 goto fail;
1380 }
1381 #endif
1382
1383 /* put device-specific files into sysfs */
1384 err = device_add (&udev->dev);
1385 if (err) {
1386 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1387 goto fail;
1388 }
1389 usb_create_sysfs_dev_files (udev);
1390
1391 usb_lock_device(udev);
1392
1393 /* choose and set the configuration. that registers the interfaces
1394 * with the driver core, and lets usb device drivers bind to them.
1395 */
1396 c = choose_configuration(udev);
1397 if (c >= 0) {
1398 err = usb_set_configuration(udev, c);
1399 if (err) {
1400 dev_err(&udev->dev, "can't set config #%d, error %d\n",
1401 c, err);
1402 /* This need not be fatal. The user can try to
1403 * set other configurations. */
1404 }
1405 }
1406
1407 /* USB device state == configured ... usable */
1408 usb_notify_add_device(udev);
1409
1410 usb_unlock_device(udev);
1411
1412 return 0;
1413
1414 fail:
1415 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1416 return err;
1417 }
1418
1419
1420 static int hub_port_status(struct usb_hub *hub, int port1,
1421 u16 *status, u16 *change)
1422 {
1423 int ret;
1424
1425 ret = get_port_status(hub->hdev, port1, &hub->status->port);
1426 if (ret < 0)
1427 dev_err (hub->intfdev,
1428 "%s failed (err = %d)\n", __FUNCTION__, ret);
1429 else {
1430 *status = le16_to_cpu(hub->status->port.wPortStatus);
1431 *change = le16_to_cpu(hub->status->port.wPortChange);
1432 ret = 0;
1433 }
1434 return ret;
1435 }
1436
1437 #define PORT_RESET_TRIES 5
1438 #define SET_ADDRESS_TRIES 2
1439 #define GET_DESCRIPTOR_TRIES 2
1440 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1441 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1442
1443 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1444 #define HUB_SHORT_RESET_TIME 10
1445 #define HUB_LONG_RESET_TIME 200
1446 #define HUB_RESET_TIMEOUT 500
1447
1448 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1449 struct usb_device *udev, unsigned int delay)
1450 {
1451 int delay_time, ret;
1452 u16 portstatus;
1453 u16 portchange;
1454
1455 for (delay_time = 0;
1456 delay_time < HUB_RESET_TIMEOUT;
1457 delay_time += delay) {
1458 /* wait to give the device a chance to reset */
1459 msleep(delay);
1460
1461 /* read and decode port status */
1462 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1463 if (ret < 0)
1464 return ret;
1465
1466 /* Device went away? */
1467 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1468 return -ENOTCONN;
1469
1470 /* bomb out completely if something weird happened */
1471 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1472 return -EINVAL;
1473
1474 /* if we`ve finished resetting, then break out of the loop */
1475 if (!(portstatus & USB_PORT_STAT_RESET) &&
1476 (portstatus & USB_PORT_STAT_ENABLE)) {
1477 if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1478 udev->speed = USB_SPEED_HIGH;
1479 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1480 udev->speed = USB_SPEED_LOW;
1481 else
1482 udev->speed = USB_SPEED_FULL;
1483 return 0;
1484 }
1485
1486 /* switch to the long delay after two short delay failures */
1487 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1488 delay = HUB_LONG_RESET_TIME;
1489
1490 dev_dbg (hub->intfdev,
1491 "port %d not reset yet, waiting %dms\n",
1492 port1, delay);
1493 }
1494
1495 return -EBUSY;
1496 }
1497
1498 static int hub_port_reset(struct usb_hub *hub, int port1,
1499 struct usb_device *udev, unsigned int delay)
1500 {
1501 int i, status;
1502
1503 /* Reset the port */
1504 for (i = 0; i < PORT_RESET_TRIES; i++) {
1505 status = set_port_feature(hub->hdev,
1506 port1, USB_PORT_FEAT_RESET);
1507 if (status)
1508 dev_err(hub->intfdev,
1509 "cannot reset port %d (err = %d)\n",
1510 port1, status);
1511 else {
1512 status = hub_port_wait_reset(hub, port1, udev, delay);
1513 if (status && status != -ENOTCONN)
1514 dev_dbg(hub->intfdev,
1515 "port_wait_reset: err = %d\n",
1516 status);
1517 }
1518
1519 /* return on disconnect or reset */
1520 switch (status) {
1521 case 0:
1522 /* TRSTRCY = 10 ms; plus some extra */
1523 msleep(10 + 40);
1524 /* FALL THROUGH */
1525 case -ENOTCONN:
1526 case -ENODEV:
1527 clear_port_feature(hub->hdev,
1528 port1, USB_PORT_FEAT_C_RESET);
1529 /* FIXME need disconnect() for NOTATTACHED device */
1530 usb_set_device_state(udev, status
1531 ? USB_STATE_NOTATTACHED
1532 : USB_STATE_DEFAULT);
1533 return status;
1534 }
1535
1536 dev_dbg (hub->intfdev,
1537 "port %d not enabled, trying reset again...\n",
1538 port1);
1539 delay = HUB_LONG_RESET_TIME;
1540 }
1541
1542 dev_err (hub->intfdev,
1543 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1544 port1);
1545
1546 return status;
1547 }
1548
1549 /*
1550 * Disable a port and mark a logical connnect-change event, so that some
1551 * time later khubd will disconnect() any existing usb_device on the port
1552 * and will re-enumerate if there actually is a device attached.
1553 */
1554 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1555 {
1556 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1557 hub_port_disable(hub, port1, 1);
1558
1559 /* FIXME let caller ask to power down the port:
1560 * - some devices won't enumerate without a VBUS power cycle
1561 * - SRP saves power that way
1562 * - ... new call, TBD ...
1563 * That's easy if this hub can switch power per-port, and
1564 * khubd reactivates the port later (timer, SRP, etc).
1565 * Powerdown must be optional, because of reset/DFU.
1566 */
1567
1568 set_bit(port1, hub->change_bits);
1569 kick_khubd(hub);
1570 }
1571
1572
1573 #ifdef CONFIG_USB_SUSPEND
1574
1575 /*
1576 * Selective port suspend reduces power; most suspended devices draw
1577 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1578 * All devices below the suspended port are also suspended.
1579 *
1580 * Devices leave suspend state when the host wakes them up. Some devices
1581 * also support "remote wakeup", where the device can activate the USB
1582 * tree above them to deliver data, such as a keypress or packet. In
1583 * some cases, this wakes the USB host.
1584 */
1585 static int hub_port_suspend(struct usb_hub *hub, int port1,
1586 struct usb_device *udev)
1587 {
1588 int status;
1589
1590 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1591
1592 /* enable remote wakeup when appropriate; this lets the device
1593 * wake up the upstream hub (including maybe the root hub).
1594 *
1595 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1596 * we don't explicitly enable it here.
1597 */
1598 if (device_may_wakeup(&udev->dev)) {
1599 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1600 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1601 USB_DEVICE_REMOTE_WAKEUP, 0,
1602 NULL, 0,
1603 USB_CTRL_SET_TIMEOUT);
1604 if (status)
1605 dev_dbg(&udev->dev,
1606 "won't remote wakeup, status %d\n",
1607 status);
1608 }
1609
1610 /* see 7.1.7.6 */
1611 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1612 if (status) {
1613 dev_dbg(hub->intfdev,
1614 "can't suspend port %d, status %d\n",
1615 port1, status);
1616 /* paranoia: "should not happen" */
1617 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1618 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1619 USB_DEVICE_REMOTE_WAKEUP, 0,
1620 NULL, 0,
1621 USB_CTRL_SET_TIMEOUT);
1622 } else {
1623 /* device has up to 10 msec to fully suspend */
1624 dev_dbg(&udev->dev, "usb suspend\n");
1625 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1626 msleep(10);
1627 }
1628 return status;
1629 }
1630
1631 /*
1632 * Devices on USB hub ports have only one "suspend" state, corresponding
1633 * to ACPI D2, "may cause the device to lose some context".
1634 * State transitions include:
1635 *
1636 * - suspend, resume ... when the VBUS power link stays live
1637 * - suspend, disconnect ... VBUS lost
1638 *
1639 * Once VBUS drop breaks the circuit, the port it's using has to go through
1640 * normal re-enumeration procedures, starting with enabling VBUS power.
1641 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1642 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1643 * timer, no SRP, no requests through sysfs.
1644 *
1645 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1646 * the root hub for their bus goes into global suspend ... so we don't
1647 * (falsely) update the device power state to say it suspended.
1648 */
1649 static int __usb_suspend_device (struct usb_device *udev, int port1)
1650 {
1651 int status = 0;
1652
1653 /* caller owns the udev device lock */
1654 if (port1 < 0)
1655 return port1;
1656
1657 if (udev->state == USB_STATE_SUSPENDED
1658 || udev->state == USB_STATE_NOTATTACHED) {
1659 return 0;
1660 }
1661
1662 /* all interfaces must already be suspended */
1663 if (udev->actconfig) {
1664 int i;
1665
1666 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1667 struct usb_interface *intf;
1668
1669 intf = udev->actconfig->interface[i];
1670 if (is_active(intf)) {
1671 dev_dbg(&intf->dev, "nyet suspended\n");
1672 return -EBUSY;
1673 }
1674 }
1675 }
1676
1677 /* we only change a device's upstream USB link.
1678 * root hubs have no upstream USB link.
1679 */
1680 if (udev->parent)
1681 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1682 udev);
1683
1684 if (status == 0)
1685 udev->dev.power.power_state = PMSG_SUSPEND;
1686 return status;
1687 }
1688
1689 #endif
1690
1691 /*
1692 * usb_suspend_device - suspend a usb device
1693 * @udev: device that's no longer in active use
1694 * Context: must be able to sleep; device not locked; pm locks held
1695 *
1696 * Suspends a USB device that isn't in active use, conserving power.
1697 * Devices may wake out of a suspend, if anything important happens,
1698 * using the remote wakeup mechanism. They may also be taken out of
1699 * suspend by the host, using usb_resume_device(). It's also routine
1700 * to disconnect devices while they are suspended.
1701 *
1702 * This only affects the USB hardware for a device; its interfaces
1703 * (and, for hubs, child devices) must already have been suspended.
1704 *
1705 * Suspending OTG devices may trigger HNP, if that's been enabled
1706 * between a pair of dual-role devices. That will change roles, such
1707 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1708 *
1709 * Returns 0 on success, else negative errno.
1710 */
1711 int usb_suspend_device(struct usb_device *udev)
1712 {
1713 #ifdef CONFIG_USB_SUSPEND
1714 if (udev->state == USB_STATE_NOTATTACHED)
1715 return -ENODEV;
1716 return __usb_suspend_device(udev, udev->portnum);
1717 #else
1718 /* NOTE: udev->state unchanged, it's not lying ... */
1719 udev->dev.power.power_state = PMSG_SUSPEND;
1720 return 0;
1721 #endif
1722 }
1723
1724 /*
1725 * If the USB "suspend" state is in use (rather than "global suspend"),
1726 * many devices will be individually taken out of suspend state using
1727 * special" resume" signaling. These routines kick in shortly after
1728 * hardware resume signaling is finished, either because of selective
1729 * resume (by host) or remote wakeup (by device) ... now see what changed
1730 * in the tree that's rooted at this device.
1731 */
1732 static int finish_device_resume(struct usb_device *udev)
1733 {
1734 int status;
1735 u16 devstatus;
1736
1737 /* caller owns the udev device lock */
1738 dev_dbg(&udev->dev, "finish resume\n");
1739
1740 /* usb ch9 identifies four variants of SUSPENDED, based on what
1741 * state the device resumes to. Linux currently won't see the
1742 * first two on the host side; they'd be inside hub_port_init()
1743 * during many timeouts, but khubd can't suspend until later.
1744 */
1745 usb_set_device_state(udev, udev->actconfig
1746 ? USB_STATE_CONFIGURED
1747 : USB_STATE_ADDRESS);
1748 udev->dev.power.power_state = PMSG_ON;
1749
1750 /* 10.5.4.5 says be sure devices in the tree are still there.
1751 * For now let's assume the device didn't go crazy on resume,
1752 * and device drivers will know about any resume quirks.
1753 */
1754 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1755 if (status < 2)
1756 dev_dbg(&udev->dev,
1757 "gone after usb resume? status %d\n",
1758 status);
1759 else if (udev->actconfig) {
1760 unsigned i;
1761 int (*resume)(struct device *);
1762
1763 le16_to_cpus(&devstatus);
1764 if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
1765 && udev->parent) {
1766 status = usb_control_msg(udev,
1767 usb_sndctrlpipe(udev, 0),
1768 USB_REQ_CLEAR_FEATURE,
1769 USB_RECIP_DEVICE,
1770 USB_DEVICE_REMOTE_WAKEUP, 0,
1771 NULL, 0,
1772 USB_CTRL_SET_TIMEOUT);
1773 if (status) {
1774 dev_dbg(&udev->dev, "disable remote "
1775 "wakeup, status %d\n", status);
1776 status = 0;
1777 }
1778 }
1779
1780 /* resume interface drivers; if this is a hub, it
1781 * may have a child resume event to deal with soon
1782 */
1783 resume = udev->dev.bus->resume;
1784 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1785 struct device *dev =
1786 &udev->actconfig->interface[i]->dev;
1787
1788 down(&dev->sem);
1789 (void) resume(dev);
1790 up(&dev->sem);
1791 }
1792 status = 0;
1793
1794 } else if (udev->devnum <= 0) {
1795 dev_dbg(&udev->dev, "bogus resume!\n");
1796 status = -EINVAL;
1797 }
1798 return status;
1799 }
1800
1801 #ifdef CONFIG_USB_SUSPEND
1802
1803 static int
1804 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1805 {
1806 int status;
1807
1808 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1809
1810 /* see 7.1.7.7; affects power usage, but not budgeting */
1811 status = clear_port_feature(hub->hdev,
1812 port1, USB_PORT_FEAT_SUSPEND);
1813 if (status) {
1814 dev_dbg(hub->intfdev,
1815 "can't resume port %d, status %d\n",
1816 port1, status);
1817 } else {
1818 u16 devstatus;
1819 u16 portchange;
1820
1821 /* drive resume for at least 20 msec */
1822 if (udev)
1823 dev_dbg(&udev->dev, "RESUME\n");
1824 msleep(25);
1825
1826 #define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1827 | USB_PORT_STAT_ENABLE \
1828 | USB_PORT_STAT_CONNECTION)
1829
1830 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1831 * stop resume signaling. Then finish the resume
1832 * sequence.
1833 */
1834 devstatus = portchange = 0;
1835 status = hub_port_status(hub, port1,
1836 &devstatus, &portchange);
1837 if (status < 0
1838 || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
1839 || (devstatus & USB_PORT_STAT_SUSPEND) != 0
1840 ) {
1841 dev_dbg(hub->intfdev,
1842 "port %d status %04x.%04x after resume, %d\n",
1843 port1, portchange, devstatus, status);
1844 } else {
1845 /* TRSMRCY = 10 msec */
1846 msleep(10);
1847 if (udev)
1848 status = finish_device_resume(udev);
1849 }
1850 }
1851 if (status < 0)
1852 hub_port_logical_disconnect(hub, port1);
1853
1854 return status;
1855 }
1856
1857 #endif
1858
1859 /*
1860 * usb_resume_device - re-activate a suspended usb device
1861 * @udev: device to re-activate
1862 * Context: must be able to sleep; device not locked; pm locks held
1863 *
1864 * This will re-activate the suspended device, increasing power usage
1865 * while letting drivers communicate again with its endpoints.
1866 * USB resume explicitly guarantees that the power session between
1867 * the host and the device is the same as it was when the device
1868 * suspended.
1869 *
1870 * Returns 0 on success, else negative errno.
1871 */
1872 int usb_resume_device(struct usb_device *udev)
1873 {
1874 int status;
1875
1876 if (udev->state == USB_STATE_NOTATTACHED)
1877 return -ENODEV;
1878
1879 #ifdef CONFIG_USB_SUSPEND
1880 /* selective resume of one downstream hub-to-device port */
1881 if (udev->parent) {
1882 if (udev->state == USB_STATE_SUSPENDED) {
1883 // NOTE swsusp may bork us, device state being wrong...
1884 // NOTE this fails if parent is also suspended...
1885 status = hub_port_resume(hdev_to_hub(udev->parent),
1886 udev->portnum, udev);
1887 } else
1888 status = 0;
1889 } else
1890 #endif
1891 status = finish_device_resume(udev);
1892 if (status < 0)
1893 dev_dbg(&udev->dev, "can't resume, status %d\n",
1894 status);
1895
1896 /* rebind drivers that had no suspend() */
1897 if (status == 0) {
1898 usb_unlock_device(udev);
1899 bus_rescan_devices(&usb_bus_type);
1900 usb_lock_device(udev);
1901 }
1902 return status;
1903 }
1904
1905 static int remote_wakeup(struct usb_device *udev)
1906 {
1907 int status = 0;
1908
1909 #ifdef CONFIG_USB_SUSPEND
1910
1911 /* don't repeat RESUME sequence if this device
1912 * was already woken up by some other task
1913 */
1914 usb_lock_device(udev);
1915 if (udev->state == USB_STATE_SUSPENDED) {
1916 dev_dbg(&udev->dev, "RESUME (wakeup)\n");
1917 /* TRSMRCY = 10 msec */
1918 msleep(10);
1919 status = finish_device_resume(udev);
1920 }
1921 usb_unlock_device(udev);
1922 #endif
1923 return status;
1924 }
1925
1926 static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1927 {
1928 struct usb_hub *hub = usb_get_intfdata (intf);
1929 struct usb_device *hdev = hub->hdev;
1930 unsigned port1;
1931
1932 /* fail if children aren't already suspended */
1933 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1934 struct usb_device *udev;
1935
1936 udev = hdev->children [port1-1];
1937 if (udev && (udev->dev.power.power_state.event
1938 == PM_EVENT_ON
1939 #ifdef CONFIG_USB_SUSPEND
1940 || udev->state != USB_STATE_SUSPENDED
1941 #endif
1942 )) {
1943 dev_dbg(&intf->dev, "port %d nyet suspended\n", port1);
1944 return -EBUSY;
1945 }
1946 }
1947
1948 /* "global suspend" of the downstream HC-to-USB interface */
1949 if (!hdev->parent) {
1950 struct usb_bus *bus = hdev->bus;
1951 if (bus) {
1952 int status = hcd_bus_suspend (bus);
1953
1954 if (status != 0) {
1955 dev_dbg(&hdev->dev, "'global' suspend %d\n",
1956 status);
1957 return status;
1958 }
1959 } else
1960 return -EOPNOTSUPP;
1961 }
1962
1963 /* stop khubd and related activity */
1964 hub_quiesce(hub);
1965 return 0;
1966 }
1967
1968 static int hub_resume(struct usb_interface *intf)
1969 {
1970 struct usb_device *hdev = interface_to_usbdev(intf);
1971 struct usb_hub *hub = usb_get_intfdata (intf);
1972 int status;
1973
1974 /* "global resume" of the downstream HC-to-USB interface */
1975 if (!hdev->parent) {
1976 struct usb_bus *bus = hdev->bus;
1977 if (bus) {
1978 status = hcd_bus_resume (bus);
1979 if (status) {
1980 dev_dbg(&intf->dev, "'global' resume %d\n",
1981 status);
1982 return status;
1983 }
1984 } else
1985 return -EOPNOTSUPP;
1986 if (status == 0) {
1987 /* TRSMRCY = 10 msec */
1988 msleep(10);
1989 }
1990 }
1991
1992 hub_activate(hub);
1993
1994 /* REVISIT: this recursion probably shouldn't exist. Remove
1995 * this code sometime, after retesting with different root and
1996 * external hubs.
1997 */
1998 #ifdef CONFIG_USB_SUSPEND
1999 {
2000 unsigned port1;
2001
2002 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
2003 struct usb_device *udev;
2004 u16 portstat, portchange;
2005
2006 udev = hdev->children [port1-1];
2007 status = hub_port_status(hub, port1, &portstat, &portchange);
2008 if (status == 0) {
2009 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2010 clear_port_feature(hdev, port1,
2011 USB_PORT_FEAT_C_SUSPEND);
2012 portchange &= ~USB_PORT_STAT_C_SUSPEND;
2013 }
2014
2015 /* let khubd handle disconnects etc */
2016 if (portchange)
2017 continue;
2018 }
2019
2020 if (!udev || status < 0)
2021 continue;
2022 usb_lock_device(udev);
2023 if (portstat & USB_PORT_STAT_SUSPEND)
2024 status = hub_port_resume(hub, port1, udev);
2025 else {
2026 status = finish_device_resume(udev);
2027 if (status < 0) {
2028 dev_dbg(&intf->dev, "resume port %d --> %d\n",
2029 port1, status);
2030 hub_port_logical_disconnect(hub, port1);
2031 }
2032 }
2033 usb_unlock_device(udev);
2034 }
2035 }
2036 #endif
2037 return 0;
2038 }
2039
2040 void usb_suspend_root_hub(struct usb_device *hdev)
2041 {
2042 struct usb_hub *hub = hdev_to_hub(hdev);
2043
2044 /* This also makes any led blinker stop retriggering. We're called
2045 * from irq, so the blinker might still be scheduled. Caller promises
2046 * that the root hub status URB will be canceled.
2047 */
2048 __hub_quiesce(hub);
2049 mark_quiesced(to_usb_interface(hub->intfdev));
2050 }
2051
2052 void usb_resume_root_hub(struct usb_device *hdev)
2053 {
2054 struct usb_hub *hub = hdev_to_hub(hdev);
2055
2056 hub->resume_root_hub = 1;
2057 kick_khubd(hub);
2058 }
2059
2060
2061 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2062 *
2063 * Between connect detection and reset signaling there must be a delay
2064 * of 100ms at least for debounce and power-settling. The corresponding
2065 * timer shall restart whenever the downstream port detects a disconnect.
2066 *
2067 * Apparently there are some bluetooth and irda-dongles and a number of
2068 * low-speed devices for which this debounce period may last over a second.
2069 * Not covered by the spec - but easy to deal with.
2070 *
2071 * This implementation uses a 1500ms total debounce timeout; if the
2072 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2073 * every 25ms for transient disconnects. When the port status has been
2074 * unchanged for 100ms it returns the port status.
2075 */
2076
2077 #define HUB_DEBOUNCE_TIMEOUT 1500
2078 #define HUB_DEBOUNCE_STEP 25
2079 #define HUB_DEBOUNCE_STABLE 100
2080
2081 static int hub_port_debounce(struct usb_hub *hub, int port1)
2082 {
2083 int ret;
2084 int total_time, stable_time = 0;
2085 u16 portchange, portstatus;
2086 unsigned connection = 0xffff;
2087
2088 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2089 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2090 if (ret < 0)
2091 return ret;
2092
2093 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2094 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2095 stable_time += HUB_DEBOUNCE_STEP;
2096 if (stable_time >= HUB_DEBOUNCE_STABLE)
2097 break;
2098 } else {
2099 stable_time = 0;
2100 connection = portstatus & USB_PORT_STAT_CONNECTION;
2101 }
2102
2103 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2104 clear_port_feature(hub->hdev, port1,
2105 USB_PORT_FEAT_C_CONNECTION);
2106 }
2107
2108 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2109 break;
2110 msleep(HUB_DEBOUNCE_STEP);
2111 }
2112
2113 dev_dbg (hub->intfdev,
2114 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2115 port1, total_time, stable_time, portstatus);
2116
2117 if (stable_time < HUB_DEBOUNCE_STABLE)
2118 return -ETIMEDOUT;
2119 return portstatus;
2120 }
2121
2122 static void ep0_reinit(struct usb_device *udev)
2123 {
2124 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2125 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2126 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2127 }
2128
2129 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2130 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2131
2132 static int hub_set_address(struct usb_device *udev)
2133 {
2134 int retval;
2135
2136 if (udev->devnum == 0)
2137 return -EINVAL;
2138 if (udev->state == USB_STATE_ADDRESS)
2139 return 0;
2140 if (udev->state != USB_STATE_DEFAULT)
2141 return -EINVAL;
2142 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2143 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2144 NULL, 0, USB_CTRL_SET_TIMEOUT);
2145 if (retval == 0) {
2146 usb_set_device_state(udev, USB_STATE_ADDRESS);
2147 ep0_reinit(udev);
2148 }
2149 return retval;
2150 }
2151
2152 /* Reset device, (re)assign address, get device descriptor.
2153 * Device connection must be stable, no more debouncing needed.
2154 * Returns device in USB_STATE_ADDRESS, except on error.
2155 *
2156 * If this is called for an already-existing device (as part of
2157 * usb_reset_device), the caller must own the device lock. For a
2158 * newly detected device that is not accessible through any global
2159 * pointers, it's not necessary to lock the device.
2160 */
2161 static int
2162 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2163 int retry_counter)
2164 {
2165 static DECLARE_MUTEX(usb_address0_sem);
2166
2167 struct usb_device *hdev = hub->hdev;
2168 int i, j, retval;
2169 unsigned delay = HUB_SHORT_RESET_TIME;
2170 enum usb_device_speed oldspeed = udev->speed;
2171
2172 /* root hub ports have a slightly longer reset period
2173 * (from USB 2.0 spec, section 7.1.7.5)
2174 */
2175 if (!hdev->parent) {
2176 delay = HUB_ROOT_RESET_TIME;
2177 if (port1 == hdev->bus->otg_port)
2178 hdev->bus->b_hnp_enable = 0;
2179 }
2180
2181 /* Some low speed devices have problems with the quick delay, so */
2182 /* be a bit pessimistic with those devices. RHbug #23670 */
2183 if (oldspeed == USB_SPEED_LOW)
2184 delay = HUB_LONG_RESET_TIME;
2185
2186 down(&usb_address0_sem);
2187
2188 /* Reset the device; full speed may morph to high speed */
2189 retval = hub_port_reset(hub, port1, udev, delay);
2190 if (retval < 0) /* error or disconnect */
2191 goto fail;
2192 /* success, speed is known */
2193 retval = -ENODEV;
2194
2195 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2196 dev_dbg(&udev->dev, "device reset changed speed!\n");
2197 goto fail;
2198 }
2199 oldspeed = udev->speed;
2200
2201 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2202 * it's fixed size except for full speed devices.
2203 */
2204 switch (udev->speed) {
2205 case USB_SPEED_HIGH: /* fixed at 64 */
2206 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2207 break;
2208 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2209 /* to determine the ep0 maxpacket size, try to read
2210 * the device descriptor to get bMaxPacketSize0 and
2211 * then correct our initial guess.
2212 */
2213 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2214 break;
2215 case USB_SPEED_LOW: /* fixed at 8 */
2216 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2217 break;
2218 default:
2219 goto fail;
2220 }
2221
2222 dev_info (&udev->dev,
2223 "%s %s speed USB device using %s and address %d\n",
2224 (udev->config) ? "reset" : "new",
2225 ({ char *speed; switch (udev->speed) {
2226 case USB_SPEED_LOW: speed = "low"; break;
2227 case USB_SPEED_FULL: speed = "full"; break;
2228 case USB_SPEED_HIGH: speed = "high"; break;
2229 default: speed = "?"; break;
2230 }; speed;}),
2231 udev->bus->controller->driver->name,
2232 udev->devnum);
2233
2234 /* Set up TT records, if needed */
2235 if (hdev->tt) {
2236 udev->tt = hdev->tt;
2237 udev->ttport = hdev->ttport;
2238 } else if (udev->speed != USB_SPEED_HIGH
2239 && hdev->speed == USB_SPEED_HIGH) {
2240 udev->tt = &hub->tt;
2241 udev->ttport = port1;
2242 }
2243
2244 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2245 * Because device hardware and firmware is sometimes buggy in
2246 * this area, and this is how Linux has done it for ages.
2247 * Change it cautiously.
2248 *
2249 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2250 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2251 * so it may help with some non-standards-compliant devices.
2252 * Otherwise we start with SET_ADDRESS and then try to read the
2253 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2254 * value.
2255 */
2256 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2257 if (USE_NEW_SCHEME(retry_counter)) {
2258 struct usb_device_descriptor *buf;
2259 int r = 0;
2260
2261 #define GET_DESCRIPTOR_BUFSIZE 64
2262 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2263 if (!buf) {
2264 retval = -ENOMEM;
2265 continue;
2266 }
2267
2268 /* Use a short timeout the first time through,
2269 * so that recalcitrant full-speed devices with
2270 * 8- or 16-byte ep0-maxpackets won't slow things
2271 * down tremendously by NAKing the unexpectedly
2272 * early status stage. Also, retry on all errors;
2273 * some devices are flakey.
2274 */
2275 for (j = 0; j < 3; ++j) {
2276 buf->bMaxPacketSize0 = 0;
2277 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2278 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2279 USB_DT_DEVICE << 8, 0,
2280 buf, GET_DESCRIPTOR_BUFSIZE,
2281 (i ? USB_CTRL_GET_TIMEOUT : 1000));
2282 switch (buf->bMaxPacketSize0) {
2283 case 8: case 16: case 32: case 64:
2284 if (buf->bDescriptorType ==
2285 USB_DT_DEVICE) {
2286 r = 0;
2287 break;
2288 }
2289 /* FALL THROUGH */
2290 default:
2291 if (r == 0)
2292 r = -EPROTO;
2293 break;
2294 }
2295 if (r == 0)
2296 break;
2297 }
2298 udev->descriptor.bMaxPacketSize0 =
2299 buf->bMaxPacketSize0;
2300 kfree(buf);
2301
2302 retval = hub_port_reset(hub, port1, udev, delay);
2303 if (retval < 0) /* error or disconnect */
2304 goto fail;
2305 if (oldspeed != udev->speed) {
2306 dev_dbg(&udev->dev,
2307 "device reset changed speed!\n");
2308 retval = -ENODEV;
2309 goto fail;
2310 }
2311 if (r) {
2312 dev_err(&udev->dev, "device descriptor "
2313 "read/%s, error %d\n",
2314 "64", r);
2315 retval = -EMSGSIZE;
2316 continue;
2317 }
2318 #undef GET_DESCRIPTOR_BUFSIZE
2319 }
2320
2321 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2322 retval = hub_set_address(udev);
2323 if (retval >= 0)
2324 break;
2325 msleep(200);
2326 }
2327 if (retval < 0) {
2328 dev_err(&udev->dev,
2329 "device not accepting address %d, error %d\n",
2330 udev->devnum, retval);
2331 goto fail;
2332 }
2333
2334 /* cope with hardware quirkiness:
2335 * - let SET_ADDRESS settle, some device hardware wants it
2336 * - read ep0 maxpacket even for high and low speed,
2337 */
2338 msleep(10);
2339 if (USE_NEW_SCHEME(retry_counter))
2340 break;
2341
2342 retval = usb_get_device_descriptor(udev, 8);
2343 if (retval < 8) {
2344 dev_err(&udev->dev, "device descriptor "
2345 "read/%s, error %d\n",
2346 "8", retval);
2347 if (retval >= 0)
2348 retval = -EMSGSIZE;
2349 } else {
2350 retval = 0;
2351 break;
2352 }
2353 }
2354 if (retval)
2355 goto fail;
2356
2357 i = udev->descriptor.bMaxPacketSize0;
2358 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2359 if (udev->speed != USB_SPEED_FULL ||
2360 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2361 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2362 retval = -EMSGSIZE;
2363 goto fail;
2364 }
2365 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2366 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2367 ep0_reinit(udev);
2368 }
2369
2370 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2371 if (retval < (signed)sizeof(udev->descriptor)) {
2372 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2373 "all", retval);
2374 if (retval >= 0)
2375 retval = -ENOMSG;
2376 goto fail;
2377 }
2378
2379 retval = 0;
2380
2381 fail:
2382 if (retval)
2383 hub_port_disable(hub, port1, 0);
2384 up(&usb_address0_sem);
2385 return retval;
2386 }
2387
2388 static void
2389 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2390 {
2391 struct usb_qualifier_descriptor *qual;
2392 int status;
2393
2394 qual = kmalloc (sizeof *qual, SLAB_KERNEL);
2395 if (qual == NULL)
2396 return;
2397
2398 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2399 qual, sizeof *qual);
2400 if (status == sizeof *qual) {
2401 dev_info(&udev->dev, "not running at top speed; "
2402 "connect to a high speed hub\n");
2403 /* hub LEDs are probably harder to miss than syslog */
2404 if (hub->has_indicators) {
2405 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2406 schedule_work (&hub->leds);
2407 }
2408 }
2409 kfree(qual);
2410 }
2411
2412 static unsigned
2413 hub_power_remaining (struct usb_hub *hub)
2414 {
2415 struct usb_device *hdev = hub->hdev;
2416 int remaining;
2417 int port1;
2418
2419 if (!hub->limited_power)
2420 return 0;
2421
2422 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2423 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2424 struct usb_device *udev = hdev->children[port1 - 1];
2425 int delta;
2426
2427 if (!udev)
2428 continue;
2429
2430 /* Unconfigured devices may not use more than 100mA,
2431 * or 8mA for OTG ports */
2432 if (udev->actconfig)
2433 delta = udev->actconfig->desc.bMaxPower * 2;
2434 else if (port1 != udev->bus->otg_port || hdev->parent)
2435 delta = 100;
2436 else
2437 delta = 8;
2438 if (delta > hub->mA_per_port)
2439 dev_warn(&udev->dev, "%dmA is over %umA budget "
2440 "for port %d!\n",
2441 delta, hub->mA_per_port, port1);
2442 remaining -= delta;
2443 }
2444 if (remaining < 0) {
2445 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2446 - remaining);
2447 remaining = 0;
2448 }
2449 return remaining;
2450 }
2451
2452 /* Handle physical or logical connection change events.
2453 * This routine is called when:
2454 * a port connection-change occurs;
2455 * a port enable-change occurs (often caused by EMI);
2456 * usb_reset_device() encounters changed descriptors (as from
2457 * a firmware download)
2458 * caller already locked the hub
2459 */
2460 static void hub_port_connect_change(struct usb_hub *hub, int port1,
2461 u16 portstatus, u16 portchange)
2462 {
2463 struct usb_device *hdev = hub->hdev;
2464 struct device *hub_dev = hub->intfdev;
2465 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
2466 int status, i;
2467
2468 dev_dbg (hub_dev,
2469 "port %d, status %04x, change %04x, %s\n",
2470 port1, portstatus, portchange, portspeed (portstatus));
2471
2472 if (hub->has_indicators) {
2473 set_port_led(hub, port1, HUB_LED_AUTO);
2474 hub->indicator[port1-1] = INDICATOR_AUTO;
2475 }
2476
2477 /* Disconnect any existing devices under this port */
2478 if (hdev->children[port1-1])
2479 usb_disconnect(&hdev->children[port1-1]);
2480 clear_bit(port1, hub->change_bits);
2481
2482 #ifdef CONFIG_USB_OTG
2483 /* during HNP, don't repeat the debounce */
2484 if (hdev->bus->is_b_host)
2485 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2486 #endif
2487
2488 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2489 status = hub_port_debounce(hub, port1);
2490 if (status < 0) {
2491 dev_err (hub_dev,
2492 "connect-debounce failed, port %d disabled\n",
2493 port1);
2494 goto done;
2495 }
2496 portstatus = status;
2497 }
2498
2499 /* Return now if nothing is connected */
2500 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2501
2502 /* maybe switch power back on (e.g. root hub was reset) */
2503 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
2504 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2505 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2506
2507 if (portstatus & USB_PORT_STAT_ENABLE)
2508 goto done;
2509 return;
2510 }
2511
2512 #ifdef CONFIG_USB_SUSPEND
2513 /* If something is connected, but the port is suspended, wake it up. */
2514 if (portstatus & USB_PORT_STAT_SUSPEND) {
2515 status = hub_port_resume(hub, port1, NULL);
2516 if (status < 0) {
2517 dev_dbg(hub_dev,
2518 "can't clear suspend on port %d; %d\n",
2519 port1, status);
2520 goto done;
2521 }
2522 }
2523 #endif
2524
2525 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2526 struct usb_device *udev;
2527
2528 /* reallocate for each attempt, since references
2529 * to the previous one can escape in various ways
2530 */
2531 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2532 if (!udev) {
2533 dev_err (hub_dev,
2534 "couldn't allocate port %d usb_device\n",
2535 port1);
2536 goto done;
2537 }
2538
2539 usb_set_device_state(udev, USB_STATE_POWERED);
2540 udev->speed = USB_SPEED_UNKNOWN;
2541 udev->bus_mA = hub->mA_per_port;
2542
2543 /* set the address */
2544 choose_address(udev);
2545 if (udev->devnum <= 0) {
2546 status = -ENOTCONN; /* Don't retry */
2547 goto loop;
2548 }
2549
2550 /* reset and get descriptor */
2551 status = hub_port_init(hub, udev, port1, i);
2552 if (status < 0)
2553 goto loop;
2554
2555 /* consecutive bus-powered hubs aren't reliable; they can
2556 * violate the voltage drop budget. if the new child has
2557 * a "powered" LED, users should notice we didn't enable it
2558 * (without reading syslog), even without per-port LEDs
2559 * on the parent.
2560 */
2561 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2562 && udev->bus_mA <= 100) {
2563 u16 devstat;
2564
2565 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2566 &devstat);
2567 if (status < 2) {
2568 dev_dbg(&udev->dev, "get status %d ?\n", status);
2569 goto loop_disable;
2570 }
2571 le16_to_cpus(&devstat);
2572 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2573 dev_err(&udev->dev,
2574 "can't connect bus-powered hub "
2575 "to this port\n");
2576 if (hub->has_indicators) {
2577 hub->indicator[port1-1] =
2578 INDICATOR_AMBER_BLINK;
2579 schedule_work (&hub->leds);
2580 }
2581 status = -ENOTCONN; /* Don't retry */
2582 goto loop_disable;
2583 }
2584 }
2585
2586 /* check for devices running slower than they could */
2587 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2588 && udev->speed == USB_SPEED_FULL
2589 && highspeed_hubs != 0)
2590 check_highspeed (hub, udev, port1);
2591
2592 /* Store the parent's children[] pointer. At this point
2593 * udev becomes globally accessible, although presumably
2594 * no one will look at it until hdev is unlocked.
2595 */
2596 status = 0;
2597
2598 /* We mustn't add new devices if the parent hub has
2599 * been disconnected; we would race with the
2600 * recursively_mark_NOTATTACHED() routine.
2601 */
2602 spin_lock_irq(&device_state_lock);
2603 if (hdev->state == USB_STATE_NOTATTACHED)
2604 status = -ENOTCONN;
2605 else
2606 hdev->children[port1-1] = udev;
2607 spin_unlock_irq(&device_state_lock);
2608
2609 /* Run it through the hoops (find a driver, etc) */
2610 if (!status) {
2611 status = usb_new_device(udev);
2612 if (status) {
2613 spin_lock_irq(&device_state_lock);
2614 hdev->children[port1-1] = NULL;
2615 spin_unlock_irq(&device_state_lock);
2616 }
2617 }
2618
2619 if (status)
2620 goto loop_disable;
2621
2622 status = hub_power_remaining(hub);
2623 if (status)
2624 dev_dbg(hub_dev, "%dmA power budget left\n", status);
2625
2626 return;
2627
2628 loop_disable:
2629 hub_port_disable(hub, port1, 1);
2630 loop:
2631 ep0_reinit(udev);
2632 release_address(udev);
2633 usb_put_dev(udev);
2634 if (status == -ENOTCONN)
2635 break;
2636 }
2637
2638 done:
2639 hub_port_disable(hub, port1, 1);
2640 }
2641
2642 static void hub_events(void)
2643 {
2644 struct list_head *tmp;
2645 struct usb_device *hdev;
2646 struct usb_interface *intf;
2647 struct usb_hub *hub;
2648 struct device *hub_dev;
2649 u16 hubstatus;
2650 u16 hubchange;
2651 u16 portstatus;
2652 u16 portchange;
2653 int i, ret;
2654 int connect_change;
2655
2656 /*
2657 * We restart the list every time to avoid a deadlock with
2658 * deleting hubs downstream from this one. This should be
2659 * safe since we delete the hub from the event list.
2660 * Not the most efficient, but avoids deadlocks.
2661 */
2662 while (1) {
2663
2664 /* Grab the first entry at the beginning of the list */
2665 spin_lock_irq(&hub_event_lock);
2666 if (list_empty(&hub_event_list)) {
2667 spin_unlock_irq(&hub_event_lock);
2668 break;
2669 }
2670
2671 tmp = hub_event_list.next;
2672 list_del_init(tmp);
2673
2674 hub = list_entry(tmp, struct usb_hub, event_list);
2675 hdev = hub->hdev;
2676 intf = to_usb_interface(hub->intfdev);
2677 hub_dev = &intf->dev;
2678
2679 i = hub->resume_root_hub;
2680
2681 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n",
2682 hdev->state, hub->descriptor
2683 ? hub->descriptor->bNbrPorts
2684 : 0,
2685 /* NOTE: expects max 15 ports... */
2686 (u16) hub->change_bits[0],
2687 (u16) hub->event_bits[0],
2688 i ? ", resume root" : "");
2689
2690 usb_get_intf(intf);
2691 spin_unlock_irq(&hub_event_lock);
2692
2693 /* Is this is a root hub wanting to reactivate the downstream
2694 * ports? If so, be sure the interface resumes even if its
2695 * stub "device" node was never suspended.
2696 */
2697 if (i) {
2698 dpm_runtime_resume(&hdev->dev);
2699 dpm_runtime_resume(&intf->dev);
2700 usb_put_intf(intf);
2701 continue;
2702 }
2703
2704 /* Lock the device, then check to see if we were
2705 * disconnected while waiting for the lock to succeed. */
2706 if (locktree(hdev) < 0) {
2707 usb_put_intf(intf);
2708 continue;
2709 }
2710 if (hub != usb_get_intfdata(intf))
2711 goto loop;
2712
2713 /* If the hub has died, clean up after it */
2714 if (hdev->state == USB_STATE_NOTATTACHED) {
2715 hub_pre_reset(hub, 0);
2716 goto loop;
2717 }
2718
2719 /* If this is an inactive or suspended hub, do nothing */
2720 if (hub->quiescing)
2721 goto loop;
2722
2723 if (hub->error) {
2724 dev_dbg (hub_dev, "resetting for error %d\n",
2725 hub->error);
2726
2727 ret = usb_reset_device(hdev);
2728 if (ret) {
2729 dev_dbg (hub_dev,
2730 "error resetting hub: %d\n", ret);
2731 goto loop;
2732 }
2733
2734 hub->nerrors = 0;
2735 hub->error = 0;
2736 }
2737
2738 /* deal with port status changes */
2739 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2740 if (test_bit(i, hub->busy_bits))
2741 continue;
2742 connect_change = test_bit(i, hub->change_bits);
2743 if (!test_and_clear_bit(i, hub->event_bits) &&
2744 !connect_change && !hub->activating)
2745 continue;
2746
2747 ret = hub_port_status(hub, i,
2748 &portstatus, &portchange);
2749 if (ret < 0)
2750 continue;
2751
2752 if (hub->activating && !hdev->children[i-1] &&
2753 (portstatus &
2754 USB_PORT_STAT_CONNECTION))
2755 connect_change = 1;
2756
2757 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2758 clear_port_feature(hdev, i,
2759 USB_PORT_FEAT_C_CONNECTION);
2760 connect_change = 1;
2761 }
2762
2763 if (portchange & USB_PORT_STAT_C_ENABLE) {
2764 if (!connect_change)
2765 dev_dbg (hub_dev,
2766 "port %d enable change, "
2767 "status %08x\n",
2768 i, portstatus);
2769 clear_port_feature(hdev, i,
2770 USB_PORT_FEAT_C_ENABLE);
2771
2772 /*
2773 * EM interference sometimes causes badly
2774 * shielded USB devices to be shutdown by
2775 * the hub, this hack enables them again.
2776 * Works at least with mouse driver.
2777 */
2778 if (!(portstatus & USB_PORT_STAT_ENABLE)
2779 && !connect_change
2780 && hdev->children[i-1]) {
2781 dev_err (hub_dev,
2782 "port %i "
2783 "disabled by hub (EMI?), "
2784 "re-enabling...\n",
2785 i);
2786 connect_change = 1;
2787 }
2788 }
2789
2790 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2791 clear_port_feature(hdev, i,
2792 USB_PORT_FEAT_C_SUSPEND);
2793 if (hdev->children[i-1]) {
2794 ret = remote_wakeup(hdev->
2795 children[i-1]);
2796 if (ret < 0)
2797 connect_change = 1;
2798 } else {
2799 ret = -ENODEV;
2800 hub_port_disable(hub, i, 1);
2801 }
2802 dev_dbg (hub_dev,
2803 "resume on port %d, status %d\n",
2804 i, ret);
2805 }
2806
2807 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2808 dev_err (hub_dev,
2809 "over-current change on port %d\n",
2810 i);
2811 clear_port_feature(hdev, i,
2812 USB_PORT_FEAT_C_OVER_CURRENT);
2813 hub_power_on(hub);
2814 }
2815
2816 if (portchange & USB_PORT_STAT_C_RESET) {
2817 dev_dbg (hub_dev,
2818 "reset change on port %d\n",
2819 i);
2820 clear_port_feature(hdev, i,
2821 USB_PORT_FEAT_C_RESET);
2822 }
2823
2824 if (connect_change)
2825 hub_port_connect_change(hub, i,
2826 portstatus, portchange);
2827 } /* end for i */
2828
2829 /* deal with hub status changes */
2830 if (test_and_clear_bit(0, hub->event_bits) == 0)
2831 ; /* do nothing */
2832 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2833 dev_err (hub_dev, "get_hub_status failed\n");
2834 else {
2835 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2836 dev_dbg (hub_dev, "power change\n");
2837 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
2838 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2839 /* FIXME: Is this always true? */
2840 hub->limited_power = 0;
2841 else
2842 hub->limited_power = 1;
2843 }
2844 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2845 dev_dbg (hub_dev, "overcurrent change\n");
2846 msleep(500); /* Cool down */
2847 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2848 hub_power_on(hub);
2849 }
2850 }
2851
2852 hub->activating = 0;
2853
2854 /* If this is a root hub, tell the HCD it's okay to
2855 * re-enable port-change interrupts now. */
2856 if (!hdev->parent)
2857 usb_enable_root_hub_irq(hdev->bus);
2858
2859 loop:
2860 usb_unlock_device(hdev);
2861 usb_put_intf(intf);
2862
2863 } /* end while (1) */
2864 }
2865
2866 static int hub_thread(void *__unused)
2867 {
2868 do {
2869 hub_events();
2870 wait_event_interruptible(khubd_wait,
2871 !list_empty(&hub_event_list) ||
2872 kthread_should_stop());
2873 try_to_freeze();
2874 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
2875
2876 pr_debug("%s: khubd exiting\n", usbcore_name);
2877 return 0;
2878 }
2879
2880 static struct usb_device_id hub_id_table [] = {
2881 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2882 .bDeviceClass = USB_CLASS_HUB},
2883 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2884 .bInterfaceClass = USB_CLASS_HUB},
2885 { } /* Terminating entry */
2886 };
2887
2888 MODULE_DEVICE_TABLE (usb, hub_id_table);
2889
2890 static struct usb_driver hub_driver = {
2891 .name = "hub",
2892 .probe = hub_probe,
2893 .disconnect = hub_disconnect,
2894 .suspend = hub_suspend,
2895 .resume = hub_resume,
2896 .ioctl = hub_ioctl,
2897 .id_table = hub_id_table,
2898 };
2899
2900 int usb_hub_init(void)
2901 {
2902 if (usb_register(&hub_driver) < 0) {
2903 printk(KERN_ERR "%s: can't register hub driver\n",
2904 usbcore_name);
2905 return -1;
2906 }
2907
2908 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2909 if (!IS_ERR(khubd_task))
2910 return 0;
2911
2912 /* Fall through if kernel_thread failed */
2913 usb_deregister(&hub_driver);
2914 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2915
2916 return -1;
2917 }
2918
2919 void usb_hub_cleanup(void)
2920 {
2921 kthread_stop(khubd_task);
2922
2923 /*
2924 * Hub resources are freed for us by usb_deregister. It calls
2925 * usb_driver_purge on every device which in turn calls that
2926 * devices disconnect function if it is using this driver.
2927 * The hub_disconnect function takes care of releasing the
2928 * individual hub resources. -greg
2929 */
2930 usb_deregister(&hub_driver);
2931 } /* usb_hub_cleanup() */
2932
2933 static int config_descriptors_changed(struct usb_device *udev)
2934 {
2935 unsigned index;
2936 unsigned len = 0;
2937 struct usb_config_descriptor *buf;
2938
2939 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2940 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2941 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2942 }
2943 buf = kmalloc (len, SLAB_KERNEL);
2944 if (buf == NULL) {
2945 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2946 /* assume the worst */
2947 return 1;
2948 }
2949 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2950 int length;
2951 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2952
2953 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2954 old_length);
2955 if (length < old_length) {
2956 dev_dbg(&udev->dev, "config index %d, error %d\n",
2957 index, length);
2958 break;
2959 }
2960 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2961 != 0) {
2962 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2963 index, buf->bConfigurationValue);
2964 break;
2965 }
2966 }
2967 kfree(buf);
2968 return index != udev->descriptor.bNumConfigurations;
2969 }
2970
2971 /**
2972 * usb_reset_device - perform a USB port reset to reinitialize a device
2973 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2974 *
2975 * WARNING - don't reset any device unless drivers for all of its
2976 * interfaces are expecting that reset! Maybe some driver->reset()
2977 * method should eventually help ensure sufficient cooperation.
2978 *
2979 * Do a port reset, reassign the device's address, and establish its
2980 * former operating configuration. If the reset fails, or the device's
2981 * descriptors change from their values before the reset, or the original
2982 * configuration and altsettings cannot be restored, a flag will be set
2983 * telling khubd to pretend the device has been disconnected and then
2984 * re-connected. All drivers will be unbound, and the device will be
2985 * re-enumerated and probed all over again.
2986 *
2987 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2988 * flagged for logical disconnection, or some other negative error code
2989 * if the reset wasn't even attempted.
2990 *
2991 * The caller must own the device lock. For example, it's safe to use
2992 * this from a driver probe() routine after downloading new firmware.
2993 * For calls that might not occur during probe(), drivers should lock
2994 * the device using usb_lock_device_for_reset().
2995 */
2996 int usb_reset_device(struct usb_device *udev)
2997 {
2998 struct usb_device *parent_hdev = udev->parent;
2999 struct usb_hub *parent_hub;
3000 struct usb_device_descriptor descriptor = udev->descriptor;
3001 struct usb_hub *hub = NULL;
3002 int i, ret = 0;
3003 int port1 = udev->portnum;
3004
3005 if (udev->state == USB_STATE_NOTATTACHED ||
3006 udev->state == USB_STATE_SUSPENDED) {
3007 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3008 udev->state);
3009 return -EINVAL;
3010 }
3011
3012 if (!parent_hdev) {
3013 /* this requires hcd-specific logic; see OHCI hc_restart() */
3014 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
3015 return -EISDIR;
3016 }
3017 parent_hub = hdev_to_hub(parent_hdev);
3018
3019 /* If we're resetting an active hub, take some special actions */
3020 if (udev->actconfig &&
3021 udev->actconfig->interface[0]->dev.driver ==
3022 &hub_driver.driver &&
3023 (hub = hdev_to_hub(udev)) != NULL) {
3024 hub_pre_reset(hub, 0);
3025 }
3026
3027 set_bit(port1, parent_hub->busy_bits);
3028 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
3029
3030 /* ep0 maxpacket size may change; let the HCD know about it.
3031 * Other endpoints will be handled by re-enumeration. */
3032 ep0_reinit(udev);
3033 ret = hub_port_init(parent_hub, udev, port1, i);
3034 if (ret >= 0)
3035 break;
3036 }
3037 clear_bit(port1, parent_hub->busy_bits);
3038 if (ret < 0)
3039 goto re_enumerate;
3040
3041 /* Device might have changed firmware (DFU or similar) */
3042 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
3043 || config_descriptors_changed (udev)) {
3044 dev_info(&udev->dev, "device firmware changed\n");
3045 udev->descriptor = descriptor; /* for disconnect() calls */
3046 goto re_enumerate;
3047 }
3048
3049 if (!udev->actconfig)
3050 goto done;
3051
3052 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3053 USB_REQ_SET_CONFIGURATION, 0,
3054 udev->actconfig->desc.bConfigurationValue, 0,
3055 NULL, 0, USB_CTRL_SET_TIMEOUT);
3056 if (ret < 0) {
3057 dev_err(&udev->dev,
3058 "can't restore configuration #%d (error=%d)\n",
3059 udev->actconfig->desc.bConfigurationValue, ret);
3060 goto re_enumerate;
3061 }
3062 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3063
3064 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3065 struct usb_interface *intf = udev->actconfig->interface[i];
3066 struct usb_interface_descriptor *desc;
3067
3068 /* set_interface resets host side toggle even
3069 * for altsetting zero. the interface may have no driver.
3070 */
3071 desc = &intf->cur_altsetting->desc;
3072 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3073 desc->bAlternateSetting);
3074 if (ret < 0) {
3075 dev_err(&udev->dev, "failed to restore interface %d "
3076 "altsetting %d (error=%d)\n",
3077 desc->bInterfaceNumber,
3078 desc->bAlternateSetting,
3079 ret);
3080 goto re_enumerate;
3081 }
3082 }
3083
3084 done:
3085 if (hub)
3086 hub_post_reset(hub);
3087 return 0;
3088
3089 re_enumerate:
3090 hub_port_logical_disconnect(parent_hub, port1);
3091 return -ENODEV;
3092 }
Verdex Pro support