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[PATCH] better CONFIG_W1_SLAVE_DS2433_CRC handling
[linux-2.6/verdex.git] / drivers / usb / core / hub.c
blob2651c2e2a89f5671e842b4c979f84f8d75857449
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/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/completion.h>
16 #include <linux/sched.h>
17 #include <linux/list.h>
18 #include <linux/slab.h>
19 #include <linux/smp_lock.h>
20 #include <linux/ioctl.h>
21 #include <linux/usb.h>
22 #include <linux/usbdevice_fs.h>
23 #include <linux/kthread.h>
24 #include <linux/mutex.h>
25 #include <linux/freezer.h>
26
27 #include <asm/semaphore.h>
28 #include <asm/uaccess.h>
29 #include <asm/byteorder.h>
30
31 #include "usb.h"
32 #include "hcd.h"
33 #include "hub.h"
34
35 struct usb_hub {
36 struct device *intfdev; /* the "interface" device */
37 struct usb_device *hdev;
38 struct urb *urb; /* for interrupt polling pipe */
39
40 /* buffer for urb ... with extra space in case of babble */
41 char (*buffer)[8];
42 dma_addr_t buffer_dma; /* DMA address for buffer */
43 union {
44 struct usb_hub_status hub;
45 struct usb_port_status port;
46 } *status; /* buffer for status reports */
47
48 int error; /* last reported error */
49 int nerrors; /* track consecutive errors */
50
51 struct list_head event_list; /* hubs w/data or errs ready */
52 unsigned long event_bits[1]; /* status change bitmask */
53 unsigned long change_bits[1]; /* ports with logical connect
54 status change */
55 unsigned long busy_bits[1]; /* ports being reset or
56 resumed */
57 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
58 #error event_bits[] is too short!
59 #endif
60
61 struct usb_hub_descriptor *descriptor; /* class descriptor */
62 struct usb_tt tt; /* Transaction Translator */
63
64 unsigned mA_per_port; /* current for each child */
65
66 unsigned limited_power:1;
67 unsigned quiescing:1;
68 unsigned activating:1;
69
70 unsigned has_indicators:1;
71 u8 indicator[USB_MAXCHILDREN];
72 struct delayed_work leds;
73 };
74
75
76 /* Protect struct usb_device->state and ->children members
77 * Note: Both are also protected by ->dev.sem, except that ->state can
78 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
79 static DEFINE_SPINLOCK(device_state_lock);
80
81 /* khubd's worklist and its lock */
82 static DEFINE_SPINLOCK(hub_event_lock);
83 static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
84
85 /* Wakes up khubd */
86 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
87
88 static struct task_struct *khubd_task;
89
90 /* multithreaded probe logic */
91 static int multithread_probe =
92 #ifdef CONFIG_USB_MULTITHREAD_PROBE
93 1;
94 #else
95 0;
96 #endif
97 module_param(multithread_probe, bool, S_IRUGO);
98 MODULE_PARM_DESC(multithread_probe, "Run each USB device probe in a new thread");
99
100 /* cycle leds on hubs that aren't blinking for attention */
101 static int blinkenlights = 0;
102 module_param (blinkenlights, bool, S_IRUGO);
103 MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
104
105 /*
106 * As of 2.6.10 we introduce a new USB device initialization scheme which
107 * closely resembles the way Windows works. Hopefully it will be compatible
108 * with a wider range of devices than the old scheme. However some previously
109 * working devices may start giving rise to "device not accepting address"
110 * errors; if that happens the user can try the old scheme by adjusting the
111 * following module parameters.
112 *
113 * For maximum flexibility there are two boolean parameters to control the
114 * hub driver's behavior. On the first initialization attempt, if the
115 * "old_scheme_first" parameter is set then the old scheme will be used,
116 * otherwise the new scheme is used. If that fails and "use_both_schemes"
117 * is set, then the driver will make another attempt, using the other scheme.
118 */
119 static int old_scheme_first = 0;
120 module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
121 MODULE_PARM_DESC(old_scheme_first,
122 "start with the old device initialization scheme");
123
124 static int use_both_schemes = 1;
125 module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
126 MODULE_PARM_DESC(use_both_schemes,
127 "try the other device initialization scheme if the "
128 "first one fails");
129
130
131 #ifdef DEBUG
132 static inline char *portspeed (int portstatus)
133 {
134 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
135 return "480 Mb/s";
136 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
137 return "1.5 Mb/s";
138 else
139 return "12 Mb/s";
140 }
141 #endif
142
143 /* Note that hdev or one of its children must be locked! */
144 static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
145 {
146 return usb_get_intfdata(hdev->actconfig->interface[0]);
147 }
148
149 /* USB 2.0 spec Section 11.24.4.5 */
150 static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
151 {
152 int i, ret;
153
154 for (i = 0; i < 3; i++) {
155 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
156 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
157 USB_DT_HUB << 8, 0, data, size,
158 USB_CTRL_GET_TIMEOUT);
159 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
160 return ret;
161 }
162 return -EINVAL;
163 }
164
165 /*
166 * USB 2.0 spec Section 11.24.2.1
167 */
168 static int clear_hub_feature(struct usb_device *hdev, int feature)
169 {
170 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
171 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
172 }
173
174 /*
175 * USB 2.0 spec Section 11.24.2.2
176 */
177 static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
178 {
179 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
180 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
181 NULL, 0, 1000);
182 }
183
184 /*
185 * USB 2.0 spec Section 11.24.2.13
186 */
187 static int set_port_feature(struct usb_device *hdev, int port1, int feature)
188 {
189 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
190 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
191 NULL, 0, 1000);
192 }
193
194 /*
195 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
196 * for info about using port indicators
197 */
198 static void set_port_led(
199 struct usb_hub *hub,
200 int port1,
201 int selector
202 )
203 {
204 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
205 USB_PORT_FEAT_INDICATOR);
206 if (status < 0)
207 dev_dbg (hub->intfdev,
208 "port %d indicator %s status %d\n",
209 port1,
210 ({ char *s; switch (selector) {
211 case HUB_LED_AMBER: s = "amber"; break;
212 case HUB_LED_GREEN: s = "green"; break;
213 case HUB_LED_OFF: s = "off"; break;
214 case HUB_LED_AUTO: s = "auto"; break;
215 default: s = "??"; break;
216 }; s; }),
217 status);
218 }
219
220 #define LED_CYCLE_PERIOD ((2*HZ)/3)
221
222 static void led_work (struct work_struct *work)
223 {
224 struct usb_hub *hub =
225 container_of(work, struct usb_hub, leds.work);
226 struct usb_device *hdev = hub->hdev;
227 unsigned i;
228 unsigned changed = 0;
229 int cursor = -1;
230
231 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
232 return;
233
234 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
235 unsigned selector, mode;
236
237 /* 30%-50% duty cycle */
238
239 switch (hub->indicator[i]) {
240 /* cycle marker */
241 case INDICATOR_CYCLE:
242 cursor = i;
243 selector = HUB_LED_AUTO;
244 mode = INDICATOR_AUTO;
245 break;
246 /* blinking green = sw attention */
247 case INDICATOR_GREEN_BLINK:
248 selector = HUB_LED_GREEN;
249 mode = INDICATOR_GREEN_BLINK_OFF;
250 break;
251 case INDICATOR_GREEN_BLINK_OFF:
252 selector = HUB_LED_OFF;
253 mode = INDICATOR_GREEN_BLINK;
254 break;
255 /* blinking amber = hw attention */
256 case INDICATOR_AMBER_BLINK:
257 selector = HUB_LED_AMBER;
258 mode = INDICATOR_AMBER_BLINK_OFF;
259 break;
260 case INDICATOR_AMBER_BLINK_OFF:
261 selector = HUB_LED_OFF;
262 mode = INDICATOR_AMBER_BLINK;
263 break;
264 /* blink green/amber = reserved */
265 case INDICATOR_ALT_BLINK:
266 selector = HUB_LED_GREEN;
267 mode = INDICATOR_ALT_BLINK_OFF;
268 break;
269 case INDICATOR_ALT_BLINK_OFF:
270 selector = HUB_LED_AMBER;
271 mode = INDICATOR_ALT_BLINK;
272 break;
273 default:
274 continue;
275 }
276 if (selector != HUB_LED_AUTO)
277 changed = 1;
278 set_port_led(hub, i + 1, selector);
279 hub->indicator[i] = mode;
280 }
281 if (!changed && blinkenlights) {
282 cursor++;
283 cursor %= hub->descriptor->bNbrPorts;
284 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
285 hub->indicator[cursor] = INDICATOR_CYCLE;
286 changed++;
287 }
288 if (changed)
289 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
290 }
291
292 /* use a short timeout for hub/port status fetches */
293 #define USB_STS_TIMEOUT 1000
294 #define USB_STS_RETRIES 5
295
296 /*
297 * USB 2.0 spec Section 11.24.2.6
298 */
299 static int get_hub_status(struct usb_device *hdev,
300 struct usb_hub_status *data)
301 {
302 int i, status = -ETIMEDOUT;
303
304 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
305 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
306 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
307 data, sizeof(*data), USB_STS_TIMEOUT);
308 }
309 return status;
310 }
311
312 /*
313 * USB 2.0 spec Section 11.24.2.7
314 */
315 static int get_port_status(struct usb_device *hdev, int port1,
316 struct usb_port_status *data)
317 {
318 int i, status = -ETIMEDOUT;
319
320 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
321 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
322 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
323 data, sizeof(*data), USB_STS_TIMEOUT);
324 }
325 return status;
326 }
327
328 static void kick_khubd(struct usb_hub *hub)
329 {
330 unsigned long flags;
331
332 /* Suppress autosuspend until khubd runs */
333 to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
334
335 spin_lock_irqsave(&hub_event_lock, flags);
336 if (list_empty(&hub->event_list)) {
337 list_add_tail(&hub->event_list, &hub_event_list);
338 wake_up(&khubd_wait);
339 }
340 spin_unlock_irqrestore(&hub_event_lock, flags);
341 }
342
343 void usb_kick_khubd(struct usb_device *hdev)
344 {
345 kick_khubd(hdev_to_hub(hdev));
346 }
347
348
349 /* completion function, fires on port status changes and various faults */
350 static void hub_irq(struct urb *urb)
351 {
352 struct usb_hub *hub = urb->context;
353 int status;
354 int i;
355 unsigned long bits;
356
357 switch (urb->status) {
358 case -ENOENT: /* synchronous unlink */
359 case -ECONNRESET: /* async unlink */
360 case -ESHUTDOWN: /* hardware going away */
361 return;
362
363 default: /* presumably an error */
364 /* Cause a hub reset after 10 consecutive errors */
365 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
366 if ((++hub->nerrors < 10) || hub->error)
367 goto resubmit;
368 hub->error = urb->status;
369 /* FALL THROUGH */
370
371 /* let khubd handle things */
372 case 0: /* we got data: port status changed */
373 bits = 0;
374 for (i = 0; i < urb->actual_length; ++i)
375 bits |= ((unsigned long) ((*hub->buffer)[i]))
376 << (i*8);
377 hub->event_bits[0] = bits;
378 break;
379 }
380
381 hub->nerrors = 0;
382
383 /* Something happened, let khubd figure it out */
384 kick_khubd(hub);
385
386 resubmit:
387 if (hub->quiescing)
388 return;
389
390 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
391 && status != -ENODEV && status != -EPERM)
392 dev_err (hub->intfdev, "resubmit --> %d\n", status);
393 }
394
395 /* USB 2.0 spec Section 11.24.2.3 */
396 static inline int
397 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
398 {
399 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
400 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
401 tt, NULL, 0, 1000);
402 }
403
404 /*
405 * enumeration blocks khubd for a long time. we use keventd instead, since
406 * long blocking there is the exception, not the rule. accordingly, HCDs
407 * talking to TTs must queue control transfers (not just bulk and iso), so
408 * both can talk to the same hub concurrently.
409 */
410 static void hub_tt_kevent (struct work_struct *work)
411 {
412 struct usb_hub *hub =
413 container_of(work, struct usb_hub, tt.kevent);
414 unsigned long flags;
415
416 spin_lock_irqsave (&hub->tt.lock, flags);
417 while (!list_empty (&hub->tt.clear_list)) {
418 struct list_head *temp;
419 struct usb_tt_clear *clear;
420 struct usb_device *hdev = hub->hdev;
421 int status;
422
423 temp = hub->tt.clear_list.next;
424 clear = list_entry (temp, struct usb_tt_clear, clear_list);
425 list_del (&clear->clear_list);
426
427 /* drop lock so HCD can concurrently report other TT errors */
428 spin_unlock_irqrestore (&hub->tt.lock, flags);
429 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
430 spin_lock_irqsave (&hub->tt.lock, flags);
431
432 if (status)
433 dev_err (&hdev->dev,
434 "clear tt %d (%04x) error %d\n",
435 clear->tt, clear->devinfo, status);
436 kfree(clear);
437 }
438 spin_unlock_irqrestore (&hub->tt.lock, flags);
439 }
440
441 /**
442 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
443 * @udev: the device whose split transaction failed
444 * @pipe: identifies the endpoint of the failed transaction
445 *
446 * High speed HCDs use this to tell the hub driver that some split control or
447 * bulk transaction failed in a way that requires clearing internal state of
448 * a transaction translator. This is normally detected (and reported) from
449 * interrupt context.
450 *
451 * It may not be possible for that hub to handle additional full (or low)
452 * speed transactions until that state is fully cleared out.
453 */
454 void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
455 {
456 struct usb_tt *tt = udev->tt;
457 unsigned long flags;
458 struct usb_tt_clear *clear;
459
460 /* we've got to cope with an arbitrary number of pending TT clears,
461 * since each TT has "at least two" buffers that can need it (and
462 * there can be many TTs per hub). even if they're uncommon.
463 */
464 if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
465 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
466 /* FIXME recover somehow ... RESET_TT? */
467 return;
468 }
469
470 /* info that CLEAR_TT_BUFFER needs */
471 clear->tt = tt->multi ? udev->ttport : 1;
472 clear->devinfo = usb_pipeendpoint (pipe);
473 clear->devinfo |= udev->devnum << 4;
474 clear->devinfo |= usb_pipecontrol (pipe)
475 ? (USB_ENDPOINT_XFER_CONTROL << 11)
476 : (USB_ENDPOINT_XFER_BULK << 11);
477 if (usb_pipein (pipe))
478 clear->devinfo |= 1 << 15;
479
480 /* tell keventd to clear state for this TT */
481 spin_lock_irqsave (&tt->lock, flags);
482 list_add_tail (&clear->clear_list, &tt->clear_list);
483 schedule_work (&tt->kevent);
484 spin_unlock_irqrestore (&tt->lock, flags);
485 }
486
487 static void hub_power_on(struct usb_hub *hub)
488 {
489 int port1;
490 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
491 u16 wHubCharacteristics =
492 le16_to_cpu(hub->descriptor->wHubCharacteristics);
493
494 /* Enable power on each port. Some hubs have reserved values
495 * of LPSM (> 2) in their descriptors, even though they are
496 * USB 2.0 hubs. Some hubs do not implement port-power switching
497 * but only emulate it. In all cases, the ports won't work
498 * unless we send these messages to the hub.
499 */
500 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
501 dev_dbg(hub->intfdev, "enabling power on all ports\n");
502 else
503 dev_dbg(hub->intfdev, "trying to enable port power on "
504 "non-switchable hub\n");
505 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
506 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
507
508 /* Wait at least 100 msec for power to become stable */
509 msleep(max(pgood_delay, (unsigned) 100));
510 }
511
512 static void hub_quiesce(struct usb_hub *hub)
513 {
514 /* (nonblocking) khubd and related activity won't re-trigger */
515 hub->quiescing = 1;
516 hub->activating = 0;
517
518 /* (blocking) stop khubd and related activity */
519 usb_kill_urb(hub->urb);
520 if (hub->has_indicators)
521 cancel_delayed_work(&hub->leds);
522 if (hub->has_indicators || hub->tt.hub)
523 flush_scheduled_work();
524 }
525
526 static void hub_activate(struct usb_hub *hub)
527 {
528 int status;
529
530 hub->quiescing = 0;
531 hub->activating = 1;
532
533 status = usb_submit_urb(hub->urb, GFP_NOIO);
534 if (status < 0)
535 dev_err(hub->intfdev, "activate --> %d\n", status);
536 if (hub->has_indicators && blinkenlights)
537 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
538
539 /* scan all ports ASAP */
540 kick_khubd(hub);
541 }
542
543 static int hub_hub_status(struct usb_hub *hub,
544 u16 *status, u16 *change)
545 {
546 int ret;
547
548 ret = get_hub_status(hub->hdev, &hub->status->hub);
549 if (ret < 0)
550 dev_err (hub->intfdev,
551 "%s failed (err = %d)\n", __FUNCTION__, ret);
552 else {
553 *status = le16_to_cpu(hub->status->hub.wHubStatus);
554 *change = le16_to_cpu(hub->status->hub.wHubChange);
555 ret = 0;
556 }
557 return ret;
558 }
559
560 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
561 {
562 struct usb_device *hdev = hub->hdev;
563 int ret;
564
565 if (hdev->children[port1-1] && set_state) {
566 usb_set_device_state(hdev->children[port1-1],
567 USB_STATE_NOTATTACHED);
568 }
569 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
570 if (ret)
571 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
572 port1, ret);
573
574 return ret;
575 }
576
577
578 /* caller has locked the hub device */
579 static void hub_pre_reset(struct usb_interface *intf)
580 {
581 struct usb_hub *hub = usb_get_intfdata(intf);
582 struct usb_device *hdev = hub->hdev;
583 int port1;
584
585 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
586 if (hdev->children[port1 - 1]) {
587 usb_disconnect(&hdev->children[port1 - 1]);
588 if (hub->error == 0)
589 hub_port_disable(hub, port1, 0);
590 }
591 }
592 hub_quiesce(hub);
593 }
594
595 /* caller has locked the hub device */
596 static void hub_post_reset(struct usb_interface *intf)
597 {
598 struct usb_hub *hub = usb_get_intfdata(intf);
599
600 hub_activate(hub);
601 hub_power_on(hub);
602 }
603
604
605 static int hub_configure(struct usb_hub *hub,
606 struct usb_endpoint_descriptor *endpoint)
607 {
608 struct usb_device *hdev = hub->hdev;
609 struct device *hub_dev = hub->intfdev;
610 u16 hubstatus, hubchange;
611 u16 wHubCharacteristics;
612 unsigned int pipe;
613 int maxp, ret;
614 char *message;
615
616 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
617 &hub->buffer_dma);
618 if (!hub->buffer) {
619 message = "can't allocate hub irq buffer";
620 ret = -ENOMEM;
621 goto fail;
622 }
623
624 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
625 if (!hub->status) {
626 message = "can't kmalloc hub status buffer";
627 ret = -ENOMEM;
628 goto fail;
629 }
630
631 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
632 if (!hub->descriptor) {
633 message = "can't kmalloc hub descriptor";
634 ret = -ENOMEM;
635 goto fail;
636 }
637
638 /* Request the entire hub descriptor.
639 * hub->descriptor can handle USB_MAXCHILDREN ports,
640 * but the hub can/will return fewer bytes here.
641 */
642 ret = get_hub_descriptor(hdev, hub->descriptor,
643 sizeof(*hub->descriptor));
644 if (ret < 0) {
645 message = "can't read hub descriptor";
646 goto fail;
647 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
648 message = "hub has too many ports!";
649 ret = -ENODEV;
650 goto fail;
651 }
652
653 hdev->maxchild = hub->descriptor->bNbrPorts;
654 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
655 (hdev->maxchild == 1) ? "" : "s");
656
657 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
658
659 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
660 int i;
661 char portstr [USB_MAXCHILDREN + 1];
662
663 for (i = 0; i < hdev->maxchild; i++)
664 portstr[i] = hub->descriptor->DeviceRemovable
665 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
666 ? 'F' : 'R';
667 portstr[hdev->maxchild] = 0;
668 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
669 } else
670 dev_dbg(hub_dev, "standalone hub\n");
671
672 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
673 case 0x00:
674 dev_dbg(hub_dev, "ganged power switching\n");
675 break;
676 case 0x01:
677 dev_dbg(hub_dev, "individual port power switching\n");
678 break;
679 case 0x02:
680 case 0x03:
681 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
682 break;
683 }
684
685 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
686 case 0x00:
687 dev_dbg(hub_dev, "global over-current protection\n");
688 break;
689 case 0x08:
690 dev_dbg(hub_dev, "individual port over-current protection\n");
691 break;
692 case 0x10:
693 case 0x18:
694 dev_dbg(hub_dev, "no over-current protection\n");
695 break;
696 }
697
698 spin_lock_init (&hub->tt.lock);
699 INIT_LIST_HEAD (&hub->tt.clear_list);
700 INIT_WORK (&hub->tt.kevent, hub_tt_kevent);
701 switch (hdev->descriptor.bDeviceProtocol) {
702 case 0:
703 break;
704 case 1:
705 dev_dbg(hub_dev, "Single TT\n");
706 hub->tt.hub = hdev;
707 break;
708 case 2:
709 ret = usb_set_interface(hdev, 0, 1);
710 if (ret == 0) {
711 dev_dbg(hub_dev, "TT per port\n");
712 hub->tt.multi = 1;
713 } else
714 dev_err(hub_dev, "Using single TT (err %d)\n",
715 ret);
716 hub->tt.hub = hdev;
717 break;
718 default:
719 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
720 hdev->descriptor.bDeviceProtocol);
721 break;
722 }
723
724 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
725 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
726 case HUB_TTTT_8_BITS:
727 if (hdev->descriptor.bDeviceProtocol != 0) {
728 hub->tt.think_time = 666;
729 dev_dbg(hub_dev, "TT requires at most %d "
730 "FS bit times (%d ns)\n",
731 8, hub->tt.think_time);
732 }
733 break;
734 case HUB_TTTT_16_BITS:
735 hub->tt.think_time = 666 * 2;
736 dev_dbg(hub_dev, "TT requires at most %d "
737 "FS bit times (%d ns)\n",
738 16, hub->tt.think_time);
739 break;
740 case HUB_TTTT_24_BITS:
741 hub->tt.think_time = 666 * 3;
742 dev_dbg(hub_dev, "TT requires at most %d "
743 "FS bit times (%d ns)\n",
744 24, hub->tt.think_time);
745 break;
746 case HUB_TTTT_32_BITS:
747 hub->tt.think_time = 666 * 4;
748 dev_dbg(hub_dev, "TT requires at most %d "
749 "FS bit times (%d ns)\n",
750 32, hub->tt.think_time);
751 break;
752 }
753
754 /* probe() zeroes hub->indicator[] */
755 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
756 hub->has_indicators = 1;
757 dev_dbg(hub_dev, "Port indicators are supported\n");
758 }
759
760 dev_dbg(hub_dev, "power on to power good time: %dms\n",
761 hub->descriptor->bPwrOn2PwrGood * 2);
762
763 /* power budgeting mostly matters with bus-powered hubs,
764 * and battery-powered root hubs (may provide just 8 mA).
765 */
766 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
767 if (ret < 2) {
768 message = "can't get hub status";
769 goto fail;
770 }
771 le16_to_cpus(&hubstatus);
772 if (hdev == hdev->bus->root_hub) {
773 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
774 hub->mA_per_port = 500;
775 else {
776 hub->mA_per_port = hdev->bus_mA;
777 hub->limited_power = 1;
778 }
779 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
780 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
781 hub->descriptor->bHubContrCurrent);
782 hub->limited_power = 1;
783 if (hdev->maxchild > 0) {
784 int remaining = hdev->bus_mA -
785 hub->descriptor->bHubContrCurrent;
786
787 if (remaining < hdev->maxchild * 100)
788 dev_warn(hub_dev,
789 "insufficient power available "
790 "to use all downstream ports\n");
791 hub->mA_per_port = 100; /* 7.2.1.1 */
792 }
793 } else { /* Self-powered external hub */
794 /* FIXME: What about battery-powered external hubs that
795 * provide less current per port? */
796 hub->mA_per_port = 500;
797 }
798 if (hub->mA_per_port < 500)
799 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
800 hub->mA_per_port);
801
802 ret = hub_hub_status(hub, &hubstatus, &hubchange);
803 if (ret < 0) {
804 message = "can't get hub status";
805 goto fail;
806 }
807
808 /* local power status reports aren't always correct */
809 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
810 dev_dbg(hub_dev, "local power source is %s\n",
811 (hubstatus & HUB_STATUS_LOCAL_POWER)
812 ? "lost (inactive)" : "good");
813
814 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
815 dev_dbg(hub_dev, "%sover-current condition exists\n",
816 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
817
818 /* set up the interrupt endpoint
819 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
820 * bytes as USB2.0[11.12.3] says because some hubs are known
821 * to send more data (and thus cause overflow). For root hubs,
822 * maxpktsize is defined in hcd.c's fake endpoint descriptors
823 * to be big enough for at least USB_MAXCHILDREN ports. */
824 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
825 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
826
827 if (maxp > sizeof(*hub->buffer))
828 maxp = sizeof(*hub->buffer);
829
830 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
831 if (!hub->urb) {
832 message = "couldn't allocate interrupt urb";
833 ret = -ENOMEM;
834 goto fail;
835 }
836
837 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
838 hub, endpoint->bInterval);
839 hub->urb->transfer_dma = hub->buffer_dma;
840 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
841
842 /* maybe cycle the hub leds */
843 if (hub->has_indicators && blinkenlights)
844 hub->indicator [0] = INDICATOR_CYCLE;
845
846 hub_power_on(hub);
847 hub_activate(hub);
848 return 0;
849
850 fail:
851 dev_err (hub_dev, "config failed, %s (err %d)\n",
852 message, ret);
853 /* hub_disconnect() frees urb and descriptor */
854 return ret;
855 }
856
857 static unsigned highspeed_hubs;
858
859 static void hub_disconnect(struct usb_interface *intf)
860 {
861 struct usb_hub *hub = usb_get_intfdata (intf);
862 struct usb_device *hdev;
863
864 /* Disconnect all children and quiesce the hub */
865 hub->error = 0;
866 hub_pre_reset(intf);
867
868 usb_set_intfdata (intf, NULL);
869 hdev = hub->hdev;
870
871 if (hdev->speed == USB_SPEED_HIGH)
872 highspeed_hubs--;
873
874 usb_free_urb(hub->urb);
875 hub->urb = NULL;
876
877 spin_lock_irq(&hub_event_lock);
878 list_del_init(&hub->event_list);
879 spin_unlock_irq(&hub_event_lock);
880
881 kfree(hub->descriptor);
882 hub->descriptor = NULL;
883
884 kfree(hub->status);
885 hub->status = NULL;
886
887 if (hub->buffer) {
888 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
889 hub->buffer_dma);
890 hub->buffer = NULL;
891 }
892
893 kfree(hub);
894 }
895
896 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
897 {
898 struct usb_host_interface *desc;
899 struct usb_endpoint_descriptor *endpoint;
900 struct usb_device *hdev;
901 struct usb_hub *hub;
902
903 desc = intf->cur_altsetting;
904 hdev = interface_to_usbdev(intf);
905
906 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
907 if (hdev->parent) {
908 dev_warn(&intf->dev, "ignoring external hub\n");
909 return -ENODEV;
910 }
911 #endif
912
913 /* Some hubs have a subclass of 1, which AFAICT according to the */
914 /* specs is not defined, but it works */
915 if ((desc->desc.bInterfaceSubClass != 0) &&
916 (desc->desc.bInterfaceSubClass != 1)) {
917 descriptor_error:
918 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
919 return -EIO;
920 }
921
922 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
923 if (desc->desc.bNumEndpoints != 1)
924 goto descriptor_error;
925
926 endpoint = &desc->endpoint[0].desc;
927
928 /* If it's not an interrupt in endpoint, we'd better punt! */
929 if (!usb_endpoint_is_int_in(endpoint))
930 goto descriptor_error;
931
932 /* We found a hub */
933 dev_info (&intf->dev, "USB hub found\n");
934
935 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
936 if (!hub) {
937 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
938 return -ENOMEM;
939 }
940
941 INIT_LIST_HEAD(&hub->event_list);
942 hub->intfdev = &intf->dev;
943 hub->hdev = hdev;
944 INIT_DELAYED_WORK(&hub->leds, led_work);
945
946 usb_set_intfdata (intf, hub);
947 intf->needs_remote_wakeup = 1;
948
949 if (hdev->speed == USB_SPEED_HIGH)
950 highspeed_hubs++;
951
952 if (hub_configure(hub, endpoint) >= 0)
953 return 0;
954
955 hub_disconnect (intf);
956 return -ENODEV;
957 }
958
959 static int
960 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
961 {
962 struct usb_device *hdev = interface_to_usbdev (intf);
963
964 /* assert ifno == 0 (part of hub spec) */
965 switch (code) {
966 case USBDEVFS_HUB_PORTINFO: {
967 struct usbdevfs_hub_portinfo *info = user_data;
968 int i;
969
970 spin_lock_irq(&device_state_lock);
971 if (hdev->devnum <= 0)
972 info->nports = 0;
973 else {
974 info->nports = hdev->maxchild;
975 for (i = 0; i < info->nports; i++) {
976 if (hdev->children[i] == NULL)
977 info->port[i] = 0;
978 else
979 info->port[i] =
980 hdev->children[i]->devnum;
981 }
982 }
983 spin_unlock_irq(&device_state_lock);
984
985 return info->nports + 1;
986 }
987
988 default:
989 return -ENOSYS;
990 }
991 }
992
993
994 /* grab device/port lock, returning index of that port (zero based).
995 * protects the upstream link used by this device from concurrent
996 * tree operations like suspend, resume, reset, and disconnect, which
997 * apply to everything downstream of a given port.
998 */
999 static int locktree(struct usb_device *udev)
1000 {
1001 int t;
1002 struct usb_device *hdev;
1003
1004 if (!udev)
1005 return -ENODEV;
1006
1007 /* root hub is always the first lock in the series */
1008 hdev = udev->parent;
1009 if (!hdev) {
1010 usb_lock_device(udev);
1011 return 0;
1012 }
1013
1014 /* on the path from root to us, lock everything from
1015 * top down, dropping parent locks when not needed
1016 */
1017 t = locktree(hdev);
1018 if (t < 0)
1019 return t;
1020
1021 /* everything is fail-fast once disconnect
1022 * processing starts
1023 */
1024 if (udev->state == USB_STATE_NOTATTACHED) {
1025 usb_unlock_device(hdev);
1026 return -ENODEV;
1027 }
1028
1029 /* when everyone grabs locks top->bottom,
1030 * non-overlapping work may be concurrent
1031 */
1032 usb_lock_device(udev);
1033 usb_unlock_device(hdev);
1034 return udev->portnum;
1035 }
1036
1037 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1038 {
1039 int i;
1040
1041 for (i = 0; i < udev->maxchild; ++i) {
1042 if (udev->children[i])
1043 recursively_mark_NOTATTACHED(udev->children[i]);
1044 }
1045 if (udev->state == USB_STATE_SUSPENDED)
1046 udev->discon_suspended = 1;
1047 udev->state = USB_STATE_NOTATTACHED;
1048 }
1049
1050 /**
1051 * usb_set_device_state - change a device's current state (usbcore, hcds)
1052 * @udev: pointer to device whose state should be changed
1053 * @new_state: new state value to be stored
1054 *
1055 * udev->state is _not_ fully protected by the device lock. Although
1056 * most transitions are made only while holding the lock, the state can
1057 * can change to USB_STATE_NOTATTACHED at almost any time. This
1058 * is so that devices can be marked as disconnected as soon as possible,
1059 * without having to wait for any semaphores to be released. As a result,
1060 * all changes to any device's state must be protected by the
1061 * device_state_lock spinlock.
1062 *
1063 * Once a device has been added to the device tree, all changes to its state
1064 * should be made using this routine. The state should _not_ be set directly.
1065 *
1066 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1067 * Otherwise udev->state is set to new_state, and if new_state is
1068 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1069 * to USB_STATE_NOTATTACHED.
1070 */
1071 void usb_set_device_state(struct usb_device *udev,
1072 enum usb_device_state new_state)
1073 {
1074 unsigned long flags;
1075
1076 spin_lock_irqsave(&device_state_lock, flags);
1077 if (udev->state == USB_STATE_NOTATTACHED)
1078 ; /* do nothing */
1079 else if (new_state != USB_STATE_NOTATTACHED) {
1080
1081 /* root hub wakeup capabilities are managed out-of-band
1082 * and may involve silicon errata ... ignore them here.
1083 */
1084 if (udev->parent) {
1085 if (udev->state == USB_STATE_SUSPENDED
1086 || new_state == USB_STATE_SUSPENDED)
1087 ; /* No change to wakeup settings */
1088 else if (new_state == USB_STATE_CONFIGURED)
1089 device_init_wakeup(&udev->dev,
1090 (udev->actconfig->desc.bmAttributes
1091 & USB_CONFIG_ATT_WAKEUP));
1092 else
1093 device_init_wakeup(&udev->dev, 0);
1094 }
1095 udev->state = new_state;
1096 } else
1097 recursively_mark_NOTATTACHED(udev);
1098 spin_unlock_irqrestore(&device_state_lock, flags);
1099 }
1100
1101
1102 #ifdef CONFIG_PM
1103
1104 /**
1105 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1106 * @rhdev: struct usb_device for the root hub
1107 *
1108 * The USB host controller driver calls this function when its root hub
1109 * is resumed and Vbus power has been interrupted or the controller
1110 * has been reset. The routine marks all the children of the root hub
1111 * as NOTATTACHED and marks logical connect-change events on their ports.
1112 */
1113 void usb_root_hub_lost_power(struct usb_device *rhdev)
1114 {
1115 struct usb_hub *hub;
1116 int port1;
1117 unsigned long flags;
1118
1119 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
1120
1121 /* Make sure no potential wakeup events get lost,
1122 * by forcing the root hub to be resumed.
1123 */
1124 rhdev->dev.power.prev_state.event = PM_EVENT_ON;
1125
1126 spin_lock_irqsave(&device_state_lock, flags);
1127 hub = hdev_to_hub(rhdev);
1128 for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
1129 if (rhdev->children[port1 - 1]) {
1130 recursively_mark_NOTATTACHED(
1131 rhdev->children[port1 - 1]);
1132 set_bit(port1, hub->change_bits);
1133 }
1134 }
1135 spin_unlock_irqrestore(&device_state_lock, flags);
1136 }
1137 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1138
1139 #endif /* CONFIG_PM */
1140
1141 static void choose_address(struct usb_device *udev)
1142 {
1143 int devnum;
1144 struct usb_bus *bus = udev->bus;
1145
1146 /* If khubd ever becomes multithreaded, this will need a lock */
1147
1148 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1149 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1150 bus->devnum_next);
1151 if (devnum >= 128)
1152 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1153
1154 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1155
1156 if (devnum < 128) {
1157 set_bit(devnum, bus->devmap.devicemap);
1158 udev->devnum = devnum;
1159 }
1160 }
1161
1162 static void release_address(struct usb_device *udev)
1163 {
1164 if (udev->devnum > 0) {
1165 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1166 udev->devnum = -1;
1167 }
1168 }
1169
1170 /**
1171 * usb_disconnect - disconnect a device (usbcore-internal)
1172 * @pdev: pointer to device being disconnected
1173 * Context: !in_interrupt ()
1174 *
1175 * Something got disconnected. Get rid of it and all of its children.
1176 *
1177 * If *pdev is a normal device then the parent hub must already be locked.
1178 * If *pdev is a root hub then this routine will acquire the
1179 * usb_bus_list_lock on behalf of the caller.
1180 *
1181 * Only hub drivers (including virtual root hub drivers for host
1182 * controllers) should ever call this.
1183 *
1184 * This call is synchronous, and may not be used in an interrupt context.
1185 */
1186 void usb_disconnect(struct usb_device **pdev)
1187 {
1188 struct usb_device *udev = *pdev;
1189 int i;
1190
1191 if (!udev) {
1192 pr_debug ("%s nodev\n", __FUNCTION__);
1193 return;
1194 }
1195
1196 /* mark the device as inactive, so any further urb submissions for
1197 * this device (and any of its children) will fail immediately.
1198 * this quiesces everyting except pending urbs.
1199 */
1200 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1201 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1202
1203 usb_lock_device(udev);
1204
1205 /* Free up all the children before we remove this device */
1206 for (i = 0; i < USB_MAXCHILDREN; i++) {
1207 if (udev->children[i])
1208 usb_disconnect(&udev->children[i]);
1209 }
1210
1211 /* deallocate hcd/hardware state ... nuking all pending urbs and
1212 * cleaning up all state associated with the current configuration
1213 * so that the hardware is now fully quiesced.
1214 */
1215 dev_dbg (&udev->dev, "unregistering device\n");
1216 usb_disable_device(udev, 0);
1217
1218 usb_unlock_device(udev);
1219
1220 /* Unregister the device. The device driver is responsible
1221 * for removing the device files from usbfs and sysfs and for
1222 * de-configuring the device.
1223 */
1224 device_del(&udev->dev);
1225
1226 /* Free the device number and delete the parent's children[]
1227 * (or root_hub) pointer.
1228 */
1229 release_address(udev);
1230
1231 /* Avoid races with recursively_mark_NOTATTACHED() */
1232 spin_lock_irq(&device_state_lock);
1233 *pdev = NULL;
1234 spin_unlock_irq(&device_state_lock);
1235
1236 /* Decrement the parent's count of unsuspended children */
1237 if (udev->parent) {
1238 usb_pm_lock(udev);
1239 if (!udev->discon_suspended)
1240 usb_autosuspend_device(udev->parent);
1241 usb_pm_unlock(udev);
1242 }
1243
1244 put_device(&udev->dev);
1245 }
1246
1247 #ifdef DEBUG
1248 static void show_string(struct usb_device *udev, char *id, char *string)
1249 {
1250 if (!string)
1251 return;
1252 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1253 }
1254
1255 #else
1256 static inline void show_string(struct usb_device *udev, char *id, char *string)
1257 {}
1258 #endif
1259
1260
1261 #ifdef CONFIG_USB_OTG
1262 #include "otg_whitelist.h"
1263 static int __usb_port_suspend(struct usb_device *, int port1);
1264 #endif
1265
1266 static int __usb_new_device(void *void_data)
1267 {
1268 struct usb_device *udev = void_data;
1269 int err;
1270
1271 /* Lock ourself into memory in order to keep a probe sequence
1272 * sleeping in a new thread from allowing us to be unloaded.
1273 */
1274 if (!try_module_get(THIS_MODULE))
1275 return -EINVAL;
1276
1277 err = usb_get_configuration(udev);
1278 if (err < 0) {
1279 dev_err(&udev->dev, "can't read configurations, error %d\n",
1280 err);
1281 goto fail;
1282 }
1283
1284 /* read the standard strings and cache them if present */
1285 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1286 udev->manufacturer = usb_cache_string(udev,
1287 udev->descriptor.iManufacturer);
1288 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1289
1290 /* Tell the world! */
1291 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1292 "SerialNumber=%d\n",
1293 udev->descriptor.iManufacturer,
1294 udev->descriptor.iProduct,
1295 udev->descriptor.iSerialNumber);
1296 show_string(udev, "Product", udev->product);
1297 show_string(udev, "Manufacturer", udev->manufacturer);
1298 show_string(udev, "SerialNumber", udev->serial);
1299
1300 #ifdef CONFIG_USB_OTG
1301 /*
1302 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1303 * to wake us after we've powered off VBUS; and HNP, switching roles
1304 * "host" to "peripheral". The OTG descriptor helps figure this out.
1305 */
1306 if (!udev->bus->is_b_host
1307 && udev->config
1308 && udev->parent == udev->bus->root_hub) {
1309 struct usb_otg_descriptor *desc = 0;
1310 struct usb_bus *bus = udev->bus;
1311
1312 /* descriptor may appear anywhere in config */
1313 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1314 le16_to_cpu(udev->config[0].desc.wTotalLength),
1315 USB_DT_OTG, (void **) &desc) == 0) {
1316 if (desc->bmAttributes & USB_OTG_HNP) {
1317 unsigned port1 = udev->portnum;
1318
1319 dev_info(&udev->dev,
1320 "Dual-Role OTG device on %sHNP port\n",
1321 (port1 == bus->otg_port)
1322 ? "" : "non-");
1323
1324 /* enable HNP before suspend, it's simpler */
1325 if (port1 == bus->otg_port)
1326 bus->b_hnp_enable = 1;
1327 err = usb_control_msg(udev,
1328 usb_sndctrlpipe(udev, 0),
1329 USB_REQ_SET_FEATURE, 0,
1330 bus->b_hnp_enable
1331 ? USB_DEVICE_B_HNP_ENABLE
1332 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1333 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1334 if (err < 0) {
1335 /* OTG MESSAGE: report errors here,
1336 * customize to match your product.
1337 */
1338 dev_info(&udev->dev,
1339 "can't set HNP mode; %d\n",
1340 err);
1341 bus->b_hnp_enable = 0;
1342 }
1343 }
1344 }
1345 }
1346
1347 if (!is_targeted(udev)) {
1348
1349 /* Maybe it can talk to us, though we can't talk to it.
1350 * (Includes HNP test device.)
1351 */
1352 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1353 err = __usb_port_suspend(udev, udev->bus->otg_port);
1354 if (err < 0)
1355 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1356 }
1357 err = -ENODEV;
1358 goto fail;
1359 }
1360 #endif
1361
1362 /* Register the device. The device driver is responsible
1363 * for adding the device files to usbfs and sysfs and for
1364 * configuring the device.
1365 */
1366 err = device_add (&udev->dev);
1367 if (err) {
1368 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1369 goto fail;
1370 }
1371
1372 /* Increment the parent's count of unsuspended children */
1373 if (udev->parent)
1374 usb_autoresume_device(udev->parent);
1375
1376 exit:
1377 module_put(THIS_MODULE);
1378 return err;
1379
1380 fail:
1381 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1382 goto exit;
1383 }
1384
1385 /**
1386 * usb_new_device - perform initial device setup (usbcore-internal)
1387 * @udev: newly addressed device (in ADDRESS state)
1388 *
1389 * This is called with devices which have been enumerated, but not yet
1390 * configured. The device descriptor is available, but not descriptors
1391 * for any device configuration. The caller must have locked either
1392 * the parent hub (if udev is a normal device) or else the
1393 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1394 * udev has already been installed, but udev is not yet visible through
1395 * sysfs or other filesystem code.
1396 *
1397 * The return value for this function depends on if the
1398 * multithread_probe variable is set or not. If it's set, it will
1399 * return a if the probe thread was successfully created or not. If the
1400 * variable is not set, it will return if the device is configured
1401 * properly or not. interfaces, in sysfs); else a negative errno value.
1402 *
1403 * This call is synchronous, and may not be used in an interrupt context.
1404 *
1405 * Only the hub driver or root-hub registrar should ever call this.
1406 */
1407 int usb_new_device(struct usb_device *udev)
1408 {
1409 struct task_struct *probe_task;
1410 int ret = 0;
1411
1412 if (multithread_probe) {
1413 probe_task = kthread_run(__usb_new_device, udev,
1414 "usb-probe-%s", udev->devnum);
1415 if (IS_ERR(probe_task))
1416 ret = PTR_ERR(probe_task);
1417 } else
1418 ret = __usb_new_device(udev);
1419
1420 return ret;
1421 }
1422
1423 static int hub_port_status(struct usb_hub *hub, int port1,
1424 u16 *status, u16 *change)
1425 {
1426 int ret;
1427
1428 ret = get_port_status(hub->hdev, port1, &hub->status->port);
1429 if (ret < 4) {
1430 dev_err (hub->intfdev,
1431 "%s failed (err = %d)\n", __FUNCTION__, ret);
1432 if (ret >= 0)
1433 ret = -EIO;
1434 } else {
1435 *status = le16_to_cpu(hub->status->port.wPortStatus);
1436 *change = le16_to_cpu(hub->status->port.wPortChange);
1437 ret = 0;
1438 }
1439 return ret;
1440 }
1441
1442
1443 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1444 static unsigned hub_is_wusb(struct usb_hub *hub)
1445 {
1446 struct usb_hcd *hcd;
1447 if (hub->hdev->parent != NULL) /* not a root hub? */
1448 return 0;
1449 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1450 return hcd->wireless;
1451 }
1452
1453
1454 #define PORT_RESET_TRIES 5
1455 #define SET_ADDRESS_TRIES 2
1456 #define GET_DESCRIPTOR_TRIES 2
1457 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1458 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1459
1460 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1461 #define HUB_SHORT_RESET_TIME 10
1462 #define HUB_LONG_RESET_TIME 200
1463 #define HUB_RESET_TIMEOUT 500
1464
1465 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1466 struct usb_device *udev, unsigned int delay)
1467 {
1468 int delay_time, ret;
1469 u16 portstatus;
1470 u16 portchange;
1471
1472 for (delay_time = 0;
1473 delay_time < HUB_RESET_TIMEOUT;
1474 delay_time += delay) {
1475 /* wait to give the device a chance to reset */
1476 msleep(delay);
1477
1478 /* read and decode port status */
1479 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1480 if (ret < 0)
1481 return ret;
1482
1483 /* Device went away? */
1484 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1485 return -ENOTCONN;
1486
1487 /* bomb out completely if something weird happened */
1488 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1489 return -EINVAL;
1490
1491 /* if we`ve finished resetting, then break out of the loop */
1492 if (!(portstatus & USB_PORT_STAT_RESET) &&
1493 (portstatus & USB_PORT_STAT_ENABLE)) {
1494 if (hub_is_wusb(hub))
1495 udev->speed = USB_SPEED_VARIABLE;
1496 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1497 udev->speed = USB_SPEED_HIGH;
1498 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1499 udev->speed = USB_SPEED_LOW;
1500 else
1501 udev->speed = USB_SPEED_FULL;
1502 return 0;
1503 }
1504
1505 /* switch to the long delay after two short delay failures */
1506 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1507 delay = HUB_LONG_RESET_TIME;
1508
1509 dev_dbg (hub->intfdev,
1510 "port %d not reset yet, waiting %dms\n",
1511 port1, delay);
1512 }
1513
1514 return -EBUSY;
1515 }
1516
1517 static int hub_port_reset(struct usb_hub *hub, int port1,
1518 struct usb_device *udev, unsigned int delay)
1519 {
1520 int i, status;
1521
1522 /* Reset the port */
1523 for (i = 0; i < PORT_RESET_TRIES; i++) {
1524 status = set_port_feature(hub->hdev,
1525 port1, USB_PORT_FEAT_RESET);
1526 if (status)
1527 dev_err(hub->intfdev,
1528 "cannot reset port %d (err = %d)\n",
1529 port1, status);
1530 else {
1531 status = hub_port_wait_reset(hub, port1, udev, delay);
1532 if (status && status != -ENOTCONN)
1533 dev_dbg(hub->intfdev,
1534 "port_wait_reset: err = %d\n",
1535 status);
1536 }
1537
1538 /* return on disconnect or reset */
1539 switch (status) {
1540 case 0:
1541 /* TRSTRCY = 10 ms; plus some extra */
1542 msleep(10 + 40);
1543 /* FALL THROUGH */
1544 case -ENOTCONN:
1545 case -ENODEV:
1546 clear_port_feature(hub->hdev,
1547 port1, USB_PORT_FEAT_C_RESET);
1548 /* FIXME need disconnect() for NOTATTACHED device */
1549 usb_set_device_state(udev, status
1550 ? USB_STATE_NOTATTACHED
1551 : USB_STATE_DEFAULT);
1552 return status;
1553 }
1554
1555 dev_dbg (hub->intfdev,
1556 "port %d not enabled, trying reset again...\n",
1557 port1);
1558 delay = HUB_LONG_RESET_TIME;
1559 }
1560
1561 dev_err (hub->intfdev,
1562 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1563 port1);
1564
1565 return status;
1566 }
1567
1568 /*
1569 * Disable a port and mark a logical connnect-change event, so that some
1570 * time later khubd will disconnect() any existing usb_device on the port
1571 * and will re-enumerate if there actually is a device attached.
1572 */
1573 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1574 {
1575 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1576 hub_port_disable(hub, port1, 1);
1577
1578 /* FIXME let caller ask to power down the port:
1579 * - some devices won't enumerate without a VBUS power cycle
1580 * - SRP saves power that way
1581 * - ... new call, TBD ...
1582 * That's easy if this hub can switch power per-port, and
1583 * khubd reactivates the port later (timer, SRP, etc).
1584 * Powerdown must be optional, because of reset/DFU.
1585 */
1586
1587 set_bit(port1, hub->change_bits);
1588 kick_khubd(hub);
1589 }
1590
1591 #ifdef CONFIG_PM
1592
1593 #ifdef CONFIG_USB_SUSPEND
1594
1595 /*
1596 * Selective port suspend reduces power; most suspended devices draw
1597 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1598 * All devices below the suspended port are also suspended.
1599 *
1600 * Devices leave suspend state when the host wakes them up. Some devices
1601 * also support "remote wakeup", where the device can activate the USB
1602 * tree above them to deliver data, such as a keypress or packet. In
1603 * some cases, this wakes the USB host.
1604 */
1605 static int hub_port_suspend(struct usb_hub *hub, int port1,
1606 struct usb_device *udev)
1607 {
1608 int status;
1609
1610 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1611
1612 /* enable remote wakeup when appropriate; this lets the device
1613 * wake up the upstream hub (including maybe the root hub).
1614 *
1615 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1616 * we don't explicitly enable it here.
1617 */
1618 if (udev->do_remote_wakeup) {
1619 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1620 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1621 USB_DEVICE_REMOTE_WAKEUP, 0,
1622 NULL, 0,
1623 USB_CTRL_SET_TIMEOUT);
1624 if (status)
1625 dev_dbg(&udev->dev,
1626 "won't remote wakeup, status %d\n",
1627 status);
1628 }
1629
1630 /* see 7.1.7.6 */
1631 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1632 if (status) {
1633 dev_dbg(hub->intfdev,
1634 "can't suspend port %d, status %d\n",
1635 port1, status);
1636 /* paranoia: "should not happen" */
1637 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1638 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1639 USB_DEVICE_REMOTE_WAKEUP, 0,
1640 NULL, 0,
1641 USB_CTRL_SET_TIMEOUT);
1642 } else {
1643 /* device has up to 10 msec to fully suspend */
1644 dev_dbg(&udev->dev, "usb %ssuspend\n",
1645 udev->auto_pm ? "auto-" : "");
1646 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1647 msleep(10);
1648 }
1649 return status;
1650 }
1651
1652 /*
1653 * Devices on USB hub ports have only one "suspend" state, corresponding
1654 * to ACPI D2, "may cause the device to lose some context".
1655 * State transitions include:
1656 *
1657 * - suspend, resume ... when the VBUS power link stays live
1658 * - suspend, disconnect ... VBUS lost
1659 *
1660 * Once VBUS drop breaks the circuit, the port it's using has to go through
1661 * normal re-enumeration procedures, starting with enabling VBUS power.
1662 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1663 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1664 * timer, no SRP, no requests through sysfs.
1665 *
1666 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1667 * the root hub for their bus goes into global suspend ... so we don't
1668 * (falsely) update the device power state to say it suspended.
1669 */
1670 static int __usb_port_suspend (struct usb_device *udev, int port1)
1671 {
1672 int status = 0;
1673
1674 /* caller owns the udev device lock */
1675 if (port1 < 0)
1676 return port1;
1677
1678 /* we change the device's upstream USB link,
1679 * but root hubs have no upstream USB link.
1680 */
1681 if (udev->parent)
1682 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1683 udev);
1684 else {
1685 dev_dbg(&udev->dev, "usb %ssuspend\n",
1686 udev->auto_pm ? "auto-" : "");
1687 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1688 }
1689 return status;
1690 }
1691
1692 /*
1693 * usb_port_suspend - suspend a usb device's upstream port
1694 * @udev: device that's no longer in active use
1695 * Context: must be able to sleep; device not locked; pm locks held
1696 *
1697 * Suspends a USB device that isn't in active use, conserving power.
1698 * Devices may wake out of a suspend, if anything important happens,
1699 * using the remote wakeup mechanism. They may also be taken out of
1700 * suspend by the host, using usb_port_resume(). It's also routine
1701 * to disconnect devices while they are suspended.
1702 *
1703 * This only affects the USB hardware for a device; its interfaces
1704 * (and, for hubs, child devices) must already have been suspended.
1705 *
1706 * Suspending OTG devices may trigger HNP, if that's been enabled
1707 * between a pair of dual-role devices. That will change roles, such
1708 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1709 *
1710 * Returns 0 on success, else negative errno.
1711 */
1712 int usb_port_suspend(struct usb_device *udev)
1713 {
1714 return __usb_port_suspend(udev, udev->portnum);
1715 }
1716
1717 /*
1718 * If the USB "suspend" state is in use (rather than "global suspend"),
1719 * many devices will be individually taken out of suspend state using
1720 * special" resume" signaling. These routines kick in shortly after
1721 * hardware resume signaling is finished, either because of selective
1722 * resume (by host) or remote wakeup (by device) ... now see what changed
1723 * in the tree that's rooted at this device.
1724 */
1725 static int finish_port_resume(struct usb_device *udev)
1726 {
1727 int status;
1728 u16 devstatus;
1729
1730 /* caller owns the udev device lock */
1731 dev_dbg(&udev->dev, "finish resume\n");
1732
1733 /* usb ch9 identifies four variants of SUSPENDED, based on what
1734 * state the device resumes to. Linux currently won't see the
1735 * first two on the host side; they'd be inside hub_port_init()
1736 * during many timeouts, but khubd can't suspend until later.
1737 */
1738 usb_set_device_state(udev, udev->actconfig
1739 ? USB_STATE_CONFIGURED
1740 : USB_STATE_ADDRESS);
1741
1742 /* 10.5.4.5 says be sure devices in the tree are still there.
1743 * For now let's assume the device didn't go crazy on resume,
1744 * and device drivers will know about any resume quirks.
1745 */
1746 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1747 if (status >= 0)
1748 status = (status == 2 ? 0 : -ENODEV);
1749
1750 if (status)
1751 dev_dbg(&udev->dev,
1752 "gone after usb resume? status %d\n",
1753 status);
1754 else if (udev->actconfig) {
1755 le16_to_cpus(&devstatus);
1756 if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
1757 && udev->parent) {
1758 status = usb_control_msg(udev,
1759 usb_sndctrlpipe(udev, 0),
1760 USB_REQ_CLEAR_FEATURE,
1761 USB_RECIP_DEVICE,
1762 USB_DEVICE_REMOTE_WAKEUP, 0,
1763 NULL, 0,
1764 USB_CTRL_SET_TIMEOUT);
1765 if (status)
1766 dev_dbg(&udev->dev, "disable remote "
1767 "wakeup, status %d\n", status);
1768 }
1769 status = 0;
1770
1771 } else if (udev->devnum <= 0) {
1772 dev_dbg(&udev->dev, "bogus resume!\n");
1773 status = -EINVAL;
1774 }
1775 return status;
1776 }
1777
1778 static int
1779 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1780 {
1781 int status;
1782 u16 portchange, portstatus;
1783
1784 /* Skip the initial Clear-Suspend step for a remote wakeup */
1785 status = hub_port_status(hub, port1, &portstatus, &portchange);
1786 if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
1787 goto SuspendCleared;
1788
1789 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1790
1791 set_bit(port1, hub->busy_bits);
1792
1793 /* see 7.1.7.7; affects power usage, but not budgeting */
1794 status = clear_port_feature(hub->hdev,
1795 port1, USB_PORT_FEAT_SUSPEND);
1796 if (status) {
1797 dev_dbg(hub->intfdev,
1798 "can't resume port %d, status %d\n",
1799 port1, status);
1800 } else {
1801 /* drive resume for at least 20 msec */
1802 if (udev)
1803 dev_dbg(&udev->dev, "usb %sresume\n",
1804 udev->auto_pm ? "auto-" : "");
1805 msleep(25);
1806
1807 #define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1808 | USB_PORT_STAT_ENABLE \
1809 | USB_PORT_STAT_CONNECTION)
1810
1811 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1812 * stop resume signaling. Then finish the resume
1813 * sequence.
1814 */
1815 status = hub_port_status(hub, port1, &portstatus, &portchange);
1816 SuspendCleared:
1817 if (status < 0
1818 || (portstatus & LIVE_FLAGS) != LIVE_FLAGS
1819 || (portstatus & USB_PORT_STAT_SUSPEND) != 0
1820 ) {
1821 dev_dbg(hub->intfdev,
1822 "port %d status %04x.%04x after resume, %d\n",
1823 port1, portchange, portstatus, status);
1824 if (status >= 0)
1825 status = -ENODEV;
1826 } else {
1827 if (portchange & USB_PORT_STAT_C_SUSPEND)
1828 clear_port_feature(hub->hdev, port1,
1829 USB_PORT_FEAT_C_SUSPEND);
1830 /* TRSMRCY = 10 msec */
1831 msleep(10);
1832 if (udev)
1833 status = finish_port_resume(udev);
1834 }
1835 }
1836 if (status < 0)
1837 hub_port_logical_disconnect(hub, port1);
1838
1839 clear_bit(port1, hub->busy_bits);
1840 if (!hub->hdev->parent && !hub->busy_bits[0])
1841 usb_enable_root_hub_irq(hub->hdev->bus);
1842
1843 return status;
1844 }
1845
1846 /*
1847 * usb_port_resume - re-activate a suspended usb device's upstream port
1848 * @udev: device to re-activate
1849 * Context: must be able to sleep; device not locked; pm locks held
1850 *
1851 * This will re-activate the suspended device, increasing power usage
1852 * while letting drivers communicate again with its endpoints.
1853 * USB resume explicitly guarantees that the power session between
1854 * the host and the device is the same as it was when the device
1855 * suspended.
1856 *
1857 * Returns 0 on success, else negative errno.
1858 */
1859 int usb_port_resume(struct usb_device *udev)
1860 {
1861 int status;
1862
1863 /* we change the device's upstream USB link,
1864 * but root hubs have no upstream USB link.
1865 */
1866 if (udev->parent) {
1867 // NOTE this fails if parent is also suspended...
1868 status = hub_port_resume(hdev_to_hub(udev->parent),
1869 udev->portnum, udev);
1870 } else {
1871 dev_dbg(&udev->dev, "usb %sresume\n",
1872 udev->auto_pm ? "auto-" : "");
1873 status = finish_port_resume(udev);
1874 }
1875 if (status < 0)
1876 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
1877 return status;
1878 }
1879
1880 static int remote_wakeup(struct usb_device *udev)
1881 {
1882 int status = 0;
1883
1884 usb_lock_device(udev);
1885 if (udev->state == USB_STATE_SUSPENDED) {
1886 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
1887 status = usb_autoresume_device(udev);
1888
1889 /* Give the interface drivers a chance to do something,
1890 * then autosuspend the device again. */
1891 if (status == 0)
1892 usb_autosuspend_device(udev);
1893 }
1894 usb_unlock_device(udev);
1895 return status;
1896 }
1897
1898 #else /* CONFIG_USB_SUSPEND */
1899
1900 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1901
1902 int usb_port_suspend(struct usb_device *udev)
1903 {
1904 return 0;
1905 }
1906
1907 static inline int
1908 finish_port_resume(struct usb_device *udev)
1909 {
1910 return 0;
1911 }
1912
1913 static inline int
1914 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1915 {
1916 return 0;
1917 }
1918
1919 int usb_port_resume(struct usb_device *udev)
1920 {
1921 return 0;
1922 }
1923
1924 static inline int remote_wakeup(struct usb_device *udev)
1925 {
1926 return 0;
1927 }
1928
1929 #endif
1930
1931 static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1932 {
1933 struct usb_hub *hub = usb_get_intfdata (intf);
1934 struct usb_device *hdev = hub->hdev;
1935 unsigned port1;
1936
1937 /* fail if children aren't already suspended */
1938 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1939 struct usb_device *udev;
1940
1941 udev = hdev->children [port1-1];
1942 if (udev && msg.event == PM_EVENT_SUSPEND &&
1943 #ifdef CONFIG_USB_SUSPEND
1944 udev->state != USB_STATE_SUSPENDED
1945 #else
1946 udev->dev.power.power_state.event
1947 == PM_EVENT_ON
1948 #endif
1949 ) {
1950 if (!hdev->auto_pm)
1951 dev_dbg(&intf->dev, "port %d nyet suspended\n",
1952 port1);
1953 return -EBUSY;
1954 }
1955 }
1956
1957 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1958
1959 /* "global suspend" of the downstream HC-to-USB interface */
1960 if (!hdev->parent) {
1961 struct usb_bus *bus = hdev->bus;
1962 if (bus) {
1963 int status = hcd_bus_suspend (bus);
1964
1965 if (status != 0) {
1966 dev_dbg(&hdev->dev, "'global' suspend %d\n",
1967 status);
1968 return status;
1969 }
1970 } else
1971 return -EOPNOTSUPP;
1972 }
1973
1974 /* stop khubd and related activity */
1975 hub_quiesce(hub);
1976 return 0;
1977 }
1978
1979 static int hub_resume(struct usb_interface *intf)
1980 {
1981 struct usb_hub *hub = usb_get_intfdata (intf);
1982 struct usb_device *hdev = hub->hdev;
1983 int status;
1984
1985 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1986
1987 /* "global resume" of the downstream HC-to-USB interface */
1988 if (!hdev->parent) {
1989 struct usb_bus *bus = hdev->bus;
1990 if (bus) {
1991 status = hcd_bus_resume (bus);
1992 if (status) {
1993 dev_dbg(&intf->dev, "'global' resume %d\n",
1994 status);
1995 return status;
1996 }
1997 } else
1998 return -EOPNOTSUPP;
1999 if (status == 0) {
2000 /* TRSMRCY = 10 msec */
2001 msleep(10);
2002 }
2003 }
2004
2005 /* tell khubd to look for changes on this hub */
2006 hub_activate(hub);
2007 return 0;
2008 }
2009
2010 #else /* CONFIG_PM */
2011
2012 static inline int remote_wakeup(struct usb_device *udev)
2013 {
2014 return 0;
2015 }
2016
2017 #define hub_suspend NULL
2018 #define hub_resume NULL
2019 #endif
2020
2021 void usb_resume_root_hub(struct usb_device *hdev)
2022 {
2023 struct usb_hub *hub = hdev_to_hub(hdev);
2024
2025 kick_khubd(hub);
2026 }
2027
2028
2029 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2030 *
2031 * Between connect detection and reset signaling there must be a delay
2032 * of 100ms at least for debounce and power-settling. The corresponding
2033 * timer shall restart whenever the downstream port detects a disconnect.
2034 *
2035 * Apparently there are some bluetooth and irda-dongles and a number of
2036 * low-speed devices for which this debounce period may last over a second.
2037 * Not covered by the spec - but easy to deal with.
2038 *
2039 * This implementation uses a 1500ms total debounce timeout; if the
2040 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2041 * every 25ms for transient disconnects. When the port status has been
2042 * unchanged for 100ms it returns the port status.
2043 */
2044
2045 #define HUB_DEBOUNCE_TIMEOUT 1500
2046 #define HUB_DEBOUNCE_STEP 25
2047 #define HUB_DEBOUNCE_STABLE 100
2048
2049 static int hub_port_debounce(struct usb_hub *hub, int port1)
2050 {
2051 int ret;
2052 int total_time, stable_time = 0;
2053 u16 portchange, portstatus;
2054 unsigned connection = 0xffff;
2055
2056 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2057 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2058 if (ret < 0)
2059 return ret;
2060
2061 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2062 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2063 stable_time += HUB_DEBOUNCE_STEP;
2064 if (stable_time >= HUB_DEBOUNCE_STABLE)
2065 break;
2066 } else {
2067 stable_time = 0;
2068 connection = portstatus & USB_PORT_STAT_CONNECTION;
2069 }
2070
2071 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2072 clear_port_feature(hub->hdev, port1,
2073 USB_PORT_FEAT_C_CONNECTION);
2074 }
2075
2076 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2077 break;
2078 msleep(HUB_DEBOUNCE_STEP);
2079 }
2080
2081 dev_dbg (hub->intfdev,
2082 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2083 port1, total_time, stable_time, portstatus);
2084
2085 if (stable_time < HUB_DEBOUNCE_STABLE)
2086 return -ETIMEDOUT;
2087 return portstatus;
2088 }
2089
2090 static void ep0_reinit(struct usb_device *udev)
2091 {
2092 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2093 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2094 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2095 }
2096
2097 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2098 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2099
2100 static int hub_set_address(struct usb_device *udev)
2101 {
2102 int retval;
2103
2104 if (udev->devnum == 0)
2105 return -EINVAL;
2106 if (udev->state == USB_STATE_ADDRESS)
2107 return 0;
2108 if (udev->state != USB_STATE_DEFAULT)
2109 return -EINVAL;
2110 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2111 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2112 NULL, 0, USB_CTRL_SET_TIMEOUT);
2113 if (retval == 0) {
2114 usb_set_device_state(udev, USB_STATE_ADDRESS);
2115 ep0_reinit(udev);
2116 }
2117 return retval;
2118 }
2119
2120 /* Reset device, (re)assign address, get device descriptor.
2121 * Device connection must be stable, no more debouncing needed.
2122 * Returns device in USB_STATE_ADDRESS, except on error.
2123 *
2124 * If this is called for an already-existing device (as part of
2125 * usb_reset_device), the caller must own the device lock. For a
2126 * newly detected device that is not accessible through any global
2127 * pointers, it's not necessary to lock the device.
2128 */
2129 static int
2130 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2131 int retry_counter)
2132 {
2133 static DEFINE_MUTEX(usb_address0_mutex);
2134
2135 struct usb_device *hdev = hub->hdev;
2136 int i, j, retval;
2137 unsigned delay = HUB_SHORT_RESET_TIME;
2138 enum usb_device_speed oldspeed = udev->speed;
2139 char *speed, *type;
2140
2141 /* root hub ports have a slightly longer reset period
2142 * (from USB 2.0 spec, section 7.1.7.5)
2143 */
2144 if (!hdev->parent) {
2145 delay = HUB_ROOT_RESET_TIME;
2146 if (port1 == hdev->bus->otg_port)
2147 hdev->bus->b_hnp_enable = 0;
2148 }
2149
2150 /* Some low speed devices have problems with the quick delay, so */
2151 /* be a bit pessimistic with those devices. RHbug #23670 */
2152 if (oldspeed == USB_SPEED_LOW)
2153 delay = HUB_LONG_RESET_TIME;
2154
2155 mutex_lock(&usb_address0_mutex);
2156
2157 /* Reset the device; full speed may morph to high speed */
2158 retval = hub_port_reset(hub, port1, udev, delay);
2159 if (retval < 0) /* error or disconnect */
2160 goto fail;
2161 /* success, speed is known */
2162 retval = -ENODEV;
2163
2164 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2165 dev_dbg(&udev->dev, "device reset changed speed!\n");
2166 goto fail;
2167 }
2168 oldspeed = udev->speed;
2169
2170 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2171 * it's fixed size except for full speed devices.
2172 * For Wireless USB devices, ep0 max packet is always 512 (tho
2173 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2174 */
2175 switch (udev->speed) {
2176 case USB_SPEED_VARIABLE: /* fixed at 512 */
2177 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
2178 break;
2179 case USB_SPEED_HIGH: /* fixed at 64 */
2180 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2181 break;
2182 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2183 /* to determine the ep0 maxpacket size, try to read
2184 * the device descriptor to get bMaxPacketSize0 and
2185 * then correct our initial guess.
2186 */
2187 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2188 break;
2189 case USB_SPEED_LOW: /* fixed at 8 */
2190 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2191 break;
2192 default:
2193 goto fail;
2194 }
2195
2196 type = "";
2197 switch (udev->speed) {
2198 case USB_SPEED_LOW: speed = "low"; break;
2199 case USB_SPEED_FULL: speed = "full"; break;
2200 case USB_SPEED_HIGH: speed = "high"; break;
2201 case USB_SPEED_VARIABLE:
2202 speed = "variable";
2203 type = "Wireless ";
2204 break;
2205 default: speed = "?"; break;
2206 }
2207 dev_info (&udev->dev,
2208 "%s %s speed %sUSB device using %s and address %d\n",
2209 (udev->config) ? "reset" : "new", speed, type,
2210 udev->bus->controller->driver->name, udev->devnum);
2211
2212 /* Set up TT records, if needed */
2213 if (hdev->tt) {
2214 udev->tt = hdev->tt;
2215 udev->ttport = hdev->ttport;
2216 } else if (udev->speed != USB_SPEED_HIGH
2217 && hdev->speed == USB_SPEED_HIGH) {
2218 udev->tt = &hub->tt;
2219 udev->ttport = port1;
2220 }
2221
2222 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2223 * Because device hardware and firmware is sometimes buggy in
2224 * this area, and this is how Linux has done it for ages.
2225 * Change it cautiously.
2226 *
2227 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2228 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2229 * so it may help with some non-standards-compliant devices.
2230 * Otherwise we start with SET_ADDRESS and then try to read the
2231 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2232 * value.
2233 */
2234 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2235 if (USE_NEW_SCHEME(retry_counter)) {
2236 struct usb_device_descriptor *buf;
2237 int r = 0;
2238
2239 #define GET_DESCRIPTOR_BUFSIZE 64
2240 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2241 if (!buf) {
2242 retval = -ENOMEM;
2243 continue;
2244 }
2245
2246 /* Use a short timeout the first time through,
2247 * so that recalcitrant full-speed devices with
2248 * 8- or 16-byte ep0-maxpackets won't slow things
2249 * down tremendously by NAKing the unexpectedly
2250 * early status stage. Also, retry on all errors;
2251 * some devices are flakey.
2252 * 255 is for WUSB devices, we actually need to use 512.
2253 * WUSB1.0[4.8.1].
2254 */
2255 for (j = 0; j < 3; ++j) {
2256 buf->bMaxPacketSize0 = 0;
2257 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2258 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2259 USB_DT_DEVICE << 8, 0,
2260 buf, GET_DESCRIPTOR_BUFSIZE,
2261 (i ? USB_CTRL_GET_TIMEOUT : 1000));
2262 switch (buf->bMaxPacketSize0) {
2263 case 8: case 16: case 32: case 64: case 255:
2264 if (buf->bDescriptorType ==
2265 USB_DT_DEVICE) {
2266 r = 0;
2267 break;
2268 }
2269 /* FALL THROUGH */
2270 default:
2271 if (r == 0)
2272 r = -EPROTO;
2273 break;
2274 }
2275 if (r == 0)
2276 break;
2277 }
2278 udev->descriptor.bMaxPacketSize0 =
2279 buf->bMaxPacketSize0;
2280 kfree(buf);
2281
2282 retval = hub_port_reset(hub, port1, udev, delay);
2283 if (retval < 0) /* error or disconnect */
2284 goto fail;
2285 if (oldspeed != udev->speed) {
2286 dev_dbg(&udev->dev,
2287 "device reset changed speed!\n");
2288 retval = -ENODEV;
2289 goto fail;
2290 }
2291 if (r) {
2292 dev_err(&udev->dev, "device descriptor "
2293 "read/%s, error %d\n",
2294 "64", r);
2295 retval = -EMSGSIZE;
2296 continue;
2297 }
2298 #undef GET_DESCRIPTOR_BUFSIZE
2299 }
2300
2301 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2302 retval = hub_set_address(udev);
2303 if (retval >= 0)
2304 break;
2305 msleep(200);
2306 }
2307 if (retval < 0) {
2308 dev_err(&udev->dev,
2309 "device not accepting address %d, error %d\n",
2310 udev->devnum, retval);
2311 goto fail;
2312 }
2313
2314 /* cope with hardware quirkiness:
2315 * - let SET_ADDRESS settle, some device hardware wants it
2316 * - read ep0 maxpacket even for high and low speed,
2317 */
2318 msleep(10);
2319 if (USE_NEW_SCHEME(retry_counter))
2320 break;
2321
2322 retval = usb_get_device_descriptor(udev, 8);
2323 if (retval < 8) {
2324 dev_err(&udev->dev, "device descriptor "
2325 "read/%s, error %d\n",
2326 "8", retval);
2327 if (retval >= 0)
2328 retval = -EMSGSIZE;
2329 } else {
2330 retval = 0;
2331 break;
2332 }
2333 }
2334 if (retval)
2335 goto fail;
2336
2337 i = udev->descriptor.bMaxPacketSize0 == 0xff?
2338 512 : udev->descriptor.bMaxPacketSize0;
2339 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2340 if (udev->speed != USB_SPEED_FULL ||
2341 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2342 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2343 retval = -EMSGSIZE;
2344 goto fail;
2345 }
2346 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2347 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2348 ep0_reinit(udev);
2349 }
2350
2351 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2352 if (retval < (signed)sizeof(udev->descriptor)) {
2353 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2354 "all", retval);
2355 if (retval >= 0)
2356 retval = -ENOMSG;
2357 goto fail;
2358 }
2359
2360 retval = 0;
2361
2362 fail:
2363 if (retval)
2364 hub_port_disable(hub, port1, 0);
2365 mutex_unlock(&usb_address0_mutex);
2366 return retval;
2367 }
2368
2369 static void
2370 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2371 {
2372 struct usb_qualifier_descriptor *qual;
2373 int status;
2374
2375 qual = kmalloc (sizeof *qual, GFP_KERNEL);
2376 if (qual == NULL)
2377 return;
2378
2379 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2380 qual, sizeof *qual);
2381 if (status == sizeof *qual) {
2382 dev_info(&udev->dev, "not running at top speed; "
2383 "connect to a high speed hub\n");
2384 /* hub LEDs are probably harder to miss than syslog */
2385 if (hub->has_indicators) {
2386 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2387 schedule_delayed_work (&hub->leds, 0);
2388 }
2389 }
2390 kfree(qual);
2391 }
2392
2393 static unsigned
2394 hub_power_remaining (struct usb_hub *hub)
2395 {
2396 struct usb_device *hdev = hub->hdev;
2397 int remaining;
2398 int port1;
2399
2400 if (!hub->limited_power)
2401 return 0;
2402
2403 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2404 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2405 struct usb_device *udev = hdev->children[port1 - 1];
2406 int delta;
2407
2408 if (!udev)
2409 continue;
2410
2411 /* Unconfigured devices may not use more than 100mA,
2412 * or 8mA for OTG ports */
2413 if (udev->actconfig)
2414 delta = udev->actconfig->desc.bMaxPower * 2;
2415 else if (port1 != udev->bus->otg_port || hdev->parent)
2416 delta = 100;
2417 else
2418 delta = 8;
2419 if (delta > hub->mA_per_port)
2420 dev_warn(&udev->dev, "%dmA is over %umA budget "
2421 "for port %d!\n",
2422 delta, hub->mA_per_port, port1);
2423 remaining -= delta;
2424 }
2425 if (remaining < 0) {
2426 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2427 - remaining);
2428 remaining = 0;
2429 }
2430 return remaining;
2431 }
2432
2433 /* Handle physical or logical connection change events.
2434 * This routine is called when:
2435 * a port connection-change occurs;
2436 * a port enable-change occurs (often caused by EMI);
2437 * usb_reset_device() encounters changed descriptors (as from
2438 * a firmware download)
2439 * caller already locked the hub
2440 */
2441 static void hub_port_connect_change(struct usb_hub *hub, int port1,
2442 u16 portstatus, u16 portchange)
2443 {
2444 struct usb_device *hdev = hub->hdev;
2445 struct device *hub_dev = hub->intfdev;
2446 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
2447 int status, i;
2448
2449 dev_dbg (hub_dev,
2450 "port %d, status %04x, change %04x, %s\n",
2451 port1, portstatus, portchange, portspeed (portstatus));
2452
2453 if (hub->has_indicators) {
2454 set_port_led(hub, port1, HUB_LED_AUTO);
2455 hub->indicator[port1-1] = INDICATOR_AUTO;
2456 }
2457
2458 /* Disconnect any existing devices under this port */
2459 if (hdev->children[port1-1])
2460 usb_disconnect(&hdev->children[port1-1]);
2461 clear_bit(port1, hub->change_bits);
2462
2463 #ifdef CONFIG_USB_OTG
2464 /* during HNP, don't repeat the debounce */
2465 if (hdev->bus->is_b_host)
2466 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2467 #endif
2468
2469 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2470 status = hub_port_debounce(hub, port1);
2471 if (status < 0) {
2472 dev_err (hub_dev,
2473 "connect-debounce failed, port %d disabled\n",
2474 port1);
2475 goto done;
2476 }
2477 portstatus = status;
2478 }
2479
2480 /* Return now if nothing is connected */
2481 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2482
2483 /* maybe switch power back on (e.g. root hub was reset) */
2484 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
2485 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2486 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2487
2488 if (portstatus & USB_PORT_STAT_ENABLE)
2489 goto done;
2490 return;
2491 }
2492
2493 #ifdef CONFIG_USB_SUSPEND
2494 /* If something is connected, but the port is suspended, wake it up. */
2495 if (portstatus & USB_PORT_STAT_SUSPEND) {
2496 status = hub_port_resume(hub, port1, NULL);
2497 if (status < 0) {
2498 dev_dbg(hub_dev,
2499 "can't clear suspend on port %d; %d\n",
2500 port1, status);
2501 goto done;
2502 }
2503 }
2504 #endif
2505
2506 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2507 struct usb_device *udev;
2508
2509 /* reallocate for each attempt, since references
2510 * to the previous one can escape in various ways
2511 */
2512 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2513 if (!udev) {
2514 dev_err (hub_dev,
2515 "couldn't allocate port %d usb_device\n",
2516 port1);
2517 goto done;
2518 }
2519
2520 usb_set_device_state(udev, USB_STATE_POWERED);
2521 udev->speed = USB_SPEED_UNKNOWN;
2522 udev->bus_mA = hub->mA_per_port;
2523 udev->level = hdev->level + 1;
2524
2525 /* set the address */
2526 choose_address(udev);
2527 if (udev->devnum <= 0) {
2528 status = -ENOTCONN; /* Don't retry */
2529 goto loop;
2530 }
2531
2532 /* reset and get descriptor */
2533 status = hub_port_init(hub, udev, port1, i);
2534 if (status < 0)
2535 goto loop;
2536
2537 /* consecutive bus-powered hubs aren't reliable; they can
2538 * violate the voltage drop budget. if the new child has
2539 * a "powered" LED, users should notice we didn't enable it
2540 * (without reading syslog), even without per-port LEDs
2541 * on the parent.
2542 */
2543 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2544 && udev->bus_mA <= 100) {
2545 u16 devstat;
2546
2547 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2548 &devstat);
2549 if (status < 2) {
2550 dev_dbg(&udev->dev, "get status %d ?\n", status);
2551 goto loop_disable;
2552 }
2553 le16_to_cpus(&devstat);
2554 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2555 dev_err(&udev->dev,
2556 "can't connect bus-powered hub "
2557 "to this port\n");
2558 if (hub->has_indicators) {
2559 hub->indicator[port1-1] =
2560 INDICATOR_AMBER_BLINK;
2561 schedule_delayed_work (&hub->leds, 0);
2562 }
2563 status = -ENOTCONN; /* Don't retry */
2564 goto loop_disable;
2565 }
2566 }
2567
2568 /* check for devices running slower than they could */
2569 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2570 && udev->speed == USB_SPEED_FULL
2571 && highspeed_hubs != 0)
2572 check_highspeed (hub, udev, port1);
2573
2574 /* Store the parent's children[] pointer. At this point
2575 * udev becomes globally accessible, although presumably
2576 * no one will look at it until hdev is unlocked.
2577 */
2578 status = 0;
2579
2580 /* We mustn't add new devices if the parent hub has
2581 * been disconnected; we would race with the
2582 * recursively_mark_NOTATTACHED() routine.
2583 */
2584 spin_lock_irq(&device_state_lock);
2585 if (hdev->state == USB_STATE_NOTATTACHED)
2586 status = -ENOTCONN;
2587 else
2588 hdev->children[port1-1] = udev;
2589 spin_unlock_irq(&device_state_lock);
2590
2591 /* Run it through the hoops (find a driver, etc) */
2592 if (!status) {
2593 status = usb_new_device(udev);
2594 if (status) {
2595 spin_lock_irq(&device_state_lock);
2596 hdev->children[port1-1] = NULL;
2597 spin_unlock_irq(&device_state_lock);
2598 }
2599 }
2600
2601 if (status)
2602 goto loop_disable;
2603
2604 status = hub_power_remaining(hub);
2605 if (status)
2606 dev_dbg(hub_dev, "%dmA power budget left\n", status);
2607
2608 return;
2609
2610 loop_disable:
2611 hub_port_disable(hub, port1, 1);
2612 loop:
2613 ep0_reinit(udev);
2614 release_address(udev);
2615 usb_put_dev(udev);
2616 if (status == -ENOTCONN)
2617 break;
2618 }
2619
2620 done:
2621 hub_port_disable(hub, port1, 1);
2622 }
2623
2624 static void hub_events(void)
2625 {
2626 struct list_head *tmp;
2627 struct usb_device *hdev;
2628 struct usb_interface *intf;
2629 struct usb_hub *hub;
2630 struct device *hub_dev;
2631 u16 hubstatus;
2632 u16 hubchange;
2633 u16 portstatus;
2634 u16 portchange;
2635 int i, ret;
2636 int connect_change;
2637
2638 /*
2639 * We restart the list every time to avoid a deadlock with
2640 * deleting hubs downstream from this one. This should be
2641 * safe since we delete the hub from the event list.
2642 * Not the most efficient, but avoids deadlocks.
2643 */
2644 while (1) {
2645
2646 /* Grab the first entry at the beginning of the list */
2647 spin_lock_irq(&hub_event_lock);
2648 if (list_empty(&hub_event_list)) {
2649 spin_unlock_irq(&hub_event_lock);
2650 break;
2651 }
2652
2653 tmp = hub_event_list.next;
2654 list_del_init(tmp);
2655
2656 hub = list_entry(tmp, struct usb_hub, event_list);
2657 hdev = hub->hdev;
2658 intf = to_usb_interface(hub->intfdev);
2659 hub_dev = &intf->dev;
2660
2661 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
2662 hdev->state, hub->descriptor
2663 ? hub->descriptor->bNbrPorts
2664 : 0,
2665 /* NOTE: expects max 15 ports... */
2666 (u16) hub->change_bits[0],
2667 (u16) hub->event_bits[0]);
2668
2669 usb_get_intf(intf);
2670 spin_unlock_irq(&hub_event_lock);
2671
2672 /* Lock the device, then check to see if we were
2673 * disconnected while waiting for the lock to succeed. */
2674 if (locktree(hdev) < 0) {
2675 usb_put_intf(intf);
2676 continue;
2677 }
2678 if (hub != usb_get_intfdata(intf))
2679 goto loop;
2680
2681 /* If the hub has died, clean up after it */
2682 if (hdev->state == USB_STATE_NOTATTACHED) {
2683 hub->error = -ENODEV;
2684 hub_pre_reset(intf);
2685 goto loop;
2686 }
2687
2688 /* Autoresume */
2689 ret = usb_autopm_get_interface(intf);
2690 if (ret) {
2691 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
2692 goto loop;
2693 }
2694
2695 /* If this is an inactive hub, do nothing */
2696 if (hub->quiescing)
2697 goto loop_autopm;
2698
2699 if (hub->error) {
2700 dev_dbg (hub_dev, "resetting for error %d\n",
2701 hub->error);
2702
2703 ret = usb_reset_composite_device(hdev, intf);
2704 if (ret) {
2705 dev_dbg (hub_dev,
2706 "error resetting hub: %d\n", ret);
2707 goto loop_autopm;
2708 }
2709
2710 hub->nerrors = 0;
2711 hub->error = 0;
2712 }
2713
2714 /* deal with port status changes */
2715 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2716 if (test_bit(i, hub->busy_bits))
2717 continue;
2718 connect_change = test_bit(i, hub->change_bits);
2719 if (!test_and_clear_bit(i, hub->event_bits) &&
2720 !connect_change && !hub->activating)
2721 continue;
2722
2723 ret = hub_port_status(hub, i,
2724 &portstatus, &portchange);
2725 if (ret < 0)
2726 continue;
2727
2728 if (hub->activating && !hdev->children[i-1] &&
2729 (portstatus &
2730 USB_PORT_STAT_CONNECTION))
2731 connect_change = 1;
2732
2733 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2734 clear_port_feature(hdev, i,
2735 USB_PORT_FEAT_C_CONNECTION);
2736 connect_change = 1;
2737 }
2738
2739 if (portchange & USB_PORT_STAT_C_ENABLE) {
2740 if (!connect_change)
2741 dev_dbg (hub_dev,
2742 "port %d enable change, "
2743 "status %08x\n",
2744 i, portstatus);
2745 clear_port_feature(hdev, i,
2746 USB_PORT_FEAT_C_ENABLE);
2747
2748 /*
2749 * EM interference sometimes causes badly
2750 * shielded USB devices to be shutdown by
2751 * the hub, this hack enables them again.
2752 * Works at least with mouse driver.
2753 */
2754 if (!(portstatus & USB_PORT_STAT_ENABLE)
2755 && !connect_change
2756 && hdev->children[i-1]) {
2757 dev_err (hub_dev,
2758 "port %i "
2759 "disabled by hub (EMI?), "
2760 "re-enabling...\n",
2761 i);
2762 connect_change = 1;
2763 }
2764 }
2765
2766 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2767 clear_port_feature(hdev, i,
2768 USB_PORT_FEAT_C_SUSPEND);
2769 if (hdev->children[i-1]) {
2770 ret = remote_wakeup(hdev->
2771 children[i-1]);
2772 if (ret < 0)
2773 connect_change = 1;
2774 } else {
2775 ret = -ENODEV;
2776 hub_port_disable(hub, i, 1);
2777 }
2778 dev_dbg (hub_dev,
2779 "resume on port %d, status %d\n",
2780 i, ret);
2781 }
2782
2783 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2784 dev_err (hub_dev,
2785 "over-current change on port %d\n",
2786 i);
2787 clear_port_feature(hdev, i,
2788 USB_PORT_FEAT_C_OVER_CURRENT);
2789 hub_power_on(hub);
2790 }
2791
2792 if (portchange & USB_PORT_STAT_C_RESET) {
2793 dev_dbg (hub_dev,
2794 "reset change on port %d\n",
2795 i);
2796 clear_port_feature(hdev, i,
2797 USB_PORT_FEAT_C_RESET);
2798 }
2799
2800 if (connect_change)
2801 hub_port_connect_change(hub, i,
2802 portstatus, portchange);
2803 } /* end for i */
2804
2805 /* deal with hub status changes */
2806 if (test_and_clear_bit(0, hub->event_bits) == 0)
2807 ; /* do nothing */
2808 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2809 dev_err (hub_dev, "get_hub_status failed\n");
2810 else {
2811 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2812 dev_dbg (hub_dev, "power change\n");
2813 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
2814 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2815 /* FIXME: Is this always true? */
2816 hub->limited_power = 0;
2817 else
2818 hub->limited_power = 1;
2819 }
2820 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2821 dev_dbg (hub_dev, "overcurrent change\n");
2822 msleep(500); /* Cool down */
2823 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2824 hub_power_on(hub);
2825 }
2826 }
2827
2828 hub->activating = 0;
2829
2830 /* If this is a root hub, tell the HCD it's okay to
2831 * re-enable port-change interrupts now. */
2832 if (!hdev->parent && !hub->busy_bits[0])
2833 usb_enable_root_hub_irq(hdev->bus);
2834
2835 loop_autopm:
2836 /* Allow autosuspend if we're not going to run again */
2837 if (list_empty(&hub->event_list))
2838 usb_autopm_enable(intf);
2839 loop:
2840 usb_unlock_device(hdev);
2841 usb_put_intf(intf);
2842
2843 } /* end while (1) */
2844 }
2845
2846 static int hub_thread(void *__unused)
2847 {
2848 do {
2849 hub_events();
2850 wait_event_interruptible(khubd_wait,
2851 !list_empty(&hub_event_list) ||
2852 kthread_should_stop());
2853 try_to_freeze();
2854 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
2855
2856 pr_debug("%s: khubd exiting\n", usbcore_name);
2857 return 0;
2858 }
2859
2860 static struct usb_device_id hub_id_table [] = {
2861 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2862 .bDeviceClass = USB_CLASS_HUB},
2863 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2864 .bInterfaceClass = USB_CLASS_HUB},
2865 { } /* Terminating entry */
2866 };
2867
2868 MODULE_DEVICE_TABLE (usb, hub_id_table);
2869
2870 static struct usb_driver hub_driver = {
2871 .name = "hub",
2872 .probe = hub_probe,
2873 .disconnect = hub_disconnect,
2874 .suspend = hub_suspend,
2875 .resume = hub_resume,
2876 .pre_reset = hub_pre_reset,
2877 .post_reset = hub_post_reset,
2878 .ioctl = hub_ioctl,
2879 .id_table = hub_id_table,
2880 .supports_autosuspend = 1,
2881 };
2882
2883 int usb_hub_init(void)
2884 {
2885 if (usb_register(&hub_driver) < 0) {
2886 printk(KERN_ERR "%s: can't register hub driver\n",
2887 usbcore_name);
2888 return -1;
2889 }
2890
2891 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2892 if (!IS_ERR(khubd_task))
2893 return 0;
2894
2895 /* Fall through if kernel_thread failed */
2896 usb_deregister(&hub_driver);
2897 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2898
2899 return -1;
2900 }
2901
2902 void usb_hub_cleanup(void)
2903 {
2904 kthread_stop(khubd_task);
2905
2906 /*
2907 * Hub resources are freed for us by usb_deregister. It calls
2908 * usb_driver_purge on every device which in turn calls that
2909 * devices disconnect function if it is using this driver.
2910 * The hub_disconnect function takes care of releasing the
2911 * individual hub resources. -greg
2912 */
2913 usb_deregister(&hub_driver);
2914 } /* usb_hub_cleanup() */
2915
2916 static int config_descriptors_changed(struct usb_device *udev)
2917 {
2918 unsigned index;
2919 unsigned len = 0;
2920 struct usb_config_descriptor *buf;
2921
2922 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2923 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2924 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2925 }
2926 buf = kmalloc (len, GFP_KERNEL);
2927 if (buf == NULL) {
2928 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2929 /* assume the worst */
2930 return 1;
2931 }
2932 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2933 int length;
2934 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2935
2936 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2937 old_length);
2938 if (length < old_length) {
2939 dev_dbg(&udev->dev, "config index %d, error %d\n",
2940 index, length);
2941 break;
2942 }
2943 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2944 != 0) {
2945 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2946 index, buf->bConfigurationValue);
2947 break;
2948 }
2949 }
2950 kfree(buf);
2951 return index != udev->descriptor.bNumConfigurations;
2952 }
2953
2954 /**
2955 * usb_reset_device - perform a USB port reset to reinitialize a device
2956 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2957 *
2958 * WARNING - don't use this routine to reset a composite device
2959 * (one with multiple interfaces owned by separate drivers)!
2960 * Use usb_reset_composite_device() instead.
2961 *
2962 * Do a port reset, reassign the device's address, and establish its
2963 * former operating configuration. If the reset fails, or the device's
2964 * descriptors change from their values before the reset, or the original
2965 * configuration and altsettings cannot be restored, a flag will be set
2966 * telling khubd to pretend the device has been disconnected and then
2967 * re-connected. All drivers will be unbound, and the device will be
2968 * re-enumerated and probed all over again.
2969 *
2970 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2971 * flagged for logical disconnection, or some other negative error code
2972 * if the reset wasn't even attempted.
2973 *
2974 * The caller must own the device lock. For example, it's safe to use
2975 * this from a driver probe() routine after downloading new firmware.
2976 * For calls that might not occur during probe(), drivers should lock
2977 * the device using usb_lock_device_for_reset().
2978 */
2979 int usb_reset_device(struct usb_device *udev)
2980 {
2981 struct usb_device *parent_hdev = udev->parent;
2982 struct usb_hub *parent_hub;
2983 struct usb_device_descriptor descriptor = udev->descriptor;
2984 int i, ret = 0;
2985 int port1 = udev->portnum;
2986
2987 if (udev->state == USB_STATE_NOTATTACHED ||
2988 udev->state == USB_STATE_SUSPENDED) {
2989 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2990 udev->state);
2991 return -EINVAL;
2992 }
2993
2994 if (!parent_hdev) {
2995 /* this requires hcd-specific logic; see OHCI hc_restart() */
2996 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2997 return -EISDIR;
2998 }
2999 parent_hub = hdev_to_hub(parent_hdev);
3000
3001 set_bit(port1, parent_hub->busy_bits);
3002 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
3003
3004 /* ep0 maxpacket size may change; let the HCD know about it.
3005 * Other endpoints will be handled by re-enumeration. */
3006 ep0_reinit(udev);
3007 ret = hub_port_init(parent_hub, udev, port1, i);
3008 if (ret >= 0)
3009 break;
3010 }
3011 clear_bit(port1, parent_hub->busy_bits);
3012 if (!parent_hdev->parent && !parent_hub->busy_bits[0])
3013 usb_enable_root_hub_irq(parent_hdev->bus);
3014
3015 if (ret < 0)
3016 goto re_enumerate;
3017
3018 /* Device might have changed firmware (DFU or similar) */
3019 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
3020 || config_descriptors_changed (udev)) {
3021 dev_info(&udev->dev, "device firmware changed\n");
3022 udev->descriptor = descriptor; /* for disconnect() calls */
3023 goto re_enumerate;
3024 }
3025
3026 if (!udev->actconfig)
3027 goto done;
3028
3029 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3030 USB_REQ_SET_CONFIGURATION, 0,
3031 udev->actconfig->desc.bConfigurationValue, 0,
3032 NULL, 0, USB_CTRL_SET_TIMEOUT);
3033 if (ret < 0) {
3034 dev_err(&udev->dev,
3035 "can't restore configuration #%d (error=%d)\n",
3036 udev->actconfig->desc.bConfigurationValue, ret);
3037 goto re_enumerate;
3038 }
3039 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3040
3041 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3042 struct usb_interface *intf = udev->actconfig->interface[i];
3043 struct usb_interface_descriptor *desc;
3044
3045 /* set_interface resets host side toggle even
3046 * for altsetting zero. the interface may have no driver.
3047 */
3048 desc = &intf->cur_altsetting->desc;
3049 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3050 desc->bAlternateSetting);
3051 if (ret < 0) {
3052 dev_err(&udev->dev, "failed to restore interface %d "
3053 "altsetting %d (error=%d)\n",
3054 desc->bInterfaceNumber,
3055 desc->bAlternateSetting,
3056 ret);
3057 goto re_enumerate;
3058 }
3059 }
3060
3061 done:
3062 return 0;
3063
3064 re_enumerate:
3065 hub_port_logical_disconnect(parent_hub, port1);
3066 return -ENODEV;
3067 }
3068 EXPORT_SYMBOL(usb_reset_device);
3069
3070 /**
3071 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3072 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3073 * @iface: interface bound to the driver making the request (optional)
3074 *
3075 * Warns all drivers bound to registered interfaces (using their pre_reset
3076 * method), performs the port reset, and then lets the drivers know that
3077 * the reset is over (using their post_reset method).
3078 *
3079 * Return value is the same as for usb_reset_device().
3080 *
3081 * The caller must own the device lock. For example, it's safe to use
3082 * this from a driver probe() routine after downloading new firmware.
3083 * For calls that might not occur during probe(), drivers should lock
3084 * the device using usb_lock_device_for_reset().
3085 *
3086 * The interface locks are acquired during the pre_reset stage and released
3087 * during the post_reset stage. However if iface is not NULL and is
3088 * currently being probed, we assume that the caller already owns its
3089 * lock.
3090 */
3091 int usb_reset_composite_device(struct usb_device *udev,
3092 struct usb_interface *iface)
3093 {
3094 int ret;
3095 struct usb_host_config *config = udev->actconfig;
3096
3097 if (udev->state == USB_STATE_NOTATTACHED ||
3098 udev->state == USB_STATE_SUSPENDED) {
3099 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3100 udev->state);
3101 return -EINVAL;
3102 }
3103
3104 /* Prevent autosuspend during the reset */
3105 usb_autoresume_device(udev);
3106
3107 if (iface && iface->condition != USB_INTERFACE_BINDING)
3108 iface = NULL;
3109
3110 if (config) {
3111 int i;
3112 struct usb_interface *cintf;
3113 struct usb_driver *drv;
3114
3115 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3116 cintf = config->interface[i];
3117 if (cintf != iface)
3118 down(&cintf->dev.sem);
3119 if (device_is_registered(&cintf->dev) &&
3120 cintf->dev.driver) {
3121 drv = to_usb_driver(cintf->dev.driver);
3122 if (drv->pre_reset)
3123 (drv->pre_reset)(cintf);
3124 }
3125 }
3126 }
3127
3128 ret = usb_reset_device(udev);
3129
3130 if (config) {
3131 int i;
3132 struct usb_interface *cintf;
3133 struct usb_driver *drv;
3134
3135 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3136 cintf = config->interface[i];
3137 if (device_is_registered(&cintf->dev) &&
3138 cintf->dev.driver) {
3139 drv = to_usb_driver(cintf->dev.driver);
3140 if (drv->post_reset)
3141 (drv->post_reset)(cintf);
3142 }
3143 if (cintf != iface)
3144 up(&cintf->dev.sem);
3145 }
3146 }
3147
3148 usb_autosuspend_device(udev);
3149 return ret;
3150 }
3151 EXPORT_SYMBOL(usb_reset_composite_device);
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