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[PATCH] USB: dummy_hcd: rename variables
[deliverable/linux.git] / drivers / usb / core / hub.c
CommitLineData
1da177e4
LT		 1/*
2 * USB hub driver.
3 *
4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
8 *
9 */
10
11#include <linux/config.h>
1da177e4
LT		 12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/module.h>
15#include <linux/moduleparam.h>
16#include <linux/completion.h>
17#include <linux/sched.h>
18#include <linux/list.h>
19#include <linux/slab.h>
20#include <linux/smp_lock.h>
21#include <linux/ioctl.h>
22#include <linux/usb.h>
23#include <linux/usbdevice_fs.h>
9c8d6178 24#include <linux/kthread.h>
1da177e4
LT		 25
26#include <asm/semaphore.h>
27#include <asm/uaccess.h>
28#include <asm/byteorder.h>
29
30#include "usb.h"
31#include "hcd.h"
32#include "hub.h"
33
34/* Protect struct usb_device->state and ->children members
35 * Note: Both are also protected by ->serialize, except that ->state can
36 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
37static DEFINE_SPINLOCK(device_state_lock);
38
39/* khubd's worklist and its lock */
40static DEFINE_SPINLOCK(hub_event_lock);
41static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
42
43/* Wakes up khubd */
44static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
45
9c8d6178 46static struct task_struct *khubd_task;
1da177e4
LT		 47
48/* cycle leds on hubs that aren't blinking for attention */
49static int blinkenlights = 0;
50module_param (blinkenlights, bool, S_IRUGO);
51MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
52
53/*
54 * As of 2.6.10 we introduce a new USB device initialization scheme which
55 * closely resembles the way Windows works. Hopefully it will be compatible
56 * with a wider range of devices than the old scheme. However some previously
57 * working devices may start giving rise to "device not accepting address"
58 * errors; if that happens the user can try the old scheme by adjusting the
59 * following module parameters.
60 *
61 * For maximum flexibility there are two boolean parameters to control the
62 * hub driver's behavior. On the first initialization attempt, if the
63 * "old_scheme_first" parameter is set then the old scheme will be used,
64 * otherwise the new scheme is used. If that fails and "use_both_schemes"
65 * is set, then the driver will make another attempt, using the other scheme.
66 */
67static int old_scheme_first = 0;
68module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
69MODULE_PARM_DESC(old_scheme_first,
70 "start with the old device initialization scheme");
71
72static int use_both_schemes = 1;
73module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
74MODULE_PARM_DESC(use_both_schemes,
75 "try the other device initialization scheme if the "
76 "first one fails");
77
78
79#ifdef DEBUG
80static inline char *portspeed (int portstatus)
81{
82 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
83 return "480 Mb/s";
84 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
85 return "1.5 Mb/s";
86 else
87 return "12 Mb/s";
88}
89#endif
90
91/* Note that hdev or one of its children must be locked! */
92static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
93{
94 return usb_get_intfdata(hdev->actconfig->interface[0]);
95}
96
97/* USB 2.0 spec Section 11.24.4.5 */
98static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
99{
100 int i, ret;
101
102 for (i = 0; i < 3; i++) {
103 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
104 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
105 USB_DT_HUB << 8, 0, data, size,
106 USB_CTRL_GET_TIMEOUT);
107 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
108 return ret;
109 }
110 return -EINVAL;
111}
112
113/*
114 * USB 2.0 spec Section 11.24.2.1
115 */
116static int clear_hub_feature(struct usb_device *hdev, int feature)
117{
118 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
119 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
120}
121
122/*
123 * USB 2.0 spec Section 11.24.2.2
124 */
125static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
126{
127 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
128 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
129 NULL, 0, 1000);
130}
131
132/*
133 * USB 2.0 spec Section 11.24.2.13
134 */
135static int set_port_feature(struct usb_device *hdev, int port1, int feature)
136{
137 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
138 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
139 NULL, 0, 1000);
140}
141
142/*
143 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
144 * for info about using port indicators
145 */
146static void set_port_led(
147 struct usb_hub *hub,
148 int port1,
149 int selector
150)
151{
152 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
153 USB_PORT_FEAT_INDICATOR);
154 if (status < 0)
155 dev_dbg (hub->intfdev,
156 "port %d indicator %s status %d\n",
157 port1,
158 ({ char *s; switch (selector) {
159 case HUB_LED_AMBER: s = "amber"; break;
160 case HUB_LED_GREEN: s = "green"; break;
161 case HUB_LED_OFF: s = "off"; break;
162 case HUB_LED_AUTO: s = "auto"; break;
163 default: s = "??"; break;
164 }; s; }),
165 status);
166}
167
168#define LED_CYCLE_PERIOD ((2*HZ)/3)
169
170static void led_work (void *__hub)
171{
172 struct usb_hub *hub = __hub;
173 struct usb_device *hdev = hub->hdev;
174 unsigned i;
175 unsigned changed = 0;
176 int cursor = -1;
177
178 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
179 return;
180
181 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
182 unsigned selector, mode;
183
184 /* 30%-50% duty cycle */
185
186 switch (hub->indicator[i]) {
187 /* cycle marker */
188 case INDICATOR_CYCLE:
189 cursor = i;
190 selector = HUB_LED_AUTO;
191 mode = INDICATOR_AUTO;
192 break;
193 /* blinking green = sw attention */
194 case INDICATOR_GREEN_BLINK:
195 selector = HUB_LED_GREEN;
196 mode = INDICATOR_GREEN_BLINK_OFF;
197 break;
198 case INDICATOR_GREEN_BLINK_OFF:
199 selector = HUB_LED_OFF;
200 mode = INDICATOR_GREEN_BLINK;
201 break;
202 /* blinking amber = hw attention */
203 case INDICATOR_AMBER_BLINK:
204 selector = HUB_LED_AMBER;
205 mode = INDICATOR_AMBER_BLINK_OFF;
206 break;
207 case INDICATOR_AMBER_BLINK_OFF:
208 selector = HUB_LED_OFF;
209 mode = INDICATOR_AMBER_BLINK;
210 break;
211 /* blink green/amber = reserved */
212 case INDICATOR_ALT_BLINK:
213 selector = HUB_LED_GREEN;
214 mode = INDICATOR_ALT_BLINK_OFF;
215 break;
216 case INDICATOR_ALT_BLINK_OFF:
217 selector = HUB_LED_AMBER;
218 mode = INDICATOR_ALT_BLINK;
219 break;
220 default:
221 continue;
222 }
223 if (selector != HUB_LED_AUTO)
224 changed = 1;
225 set_port_led(hub, i + 1, selector);
226 hub->indicator[i] = mode;
227 }
228 if (!changed && blinkenlights) {
229 cursor++;
230 cursor %= hub->descriptor->bNbrPorts;
231 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
232 hub->indicator[cursor] = INDICATOR_CYCLE;
233 changed++;
234 }
235 if (changed)
236 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
237}
238
239/* use a short timeout for hub/port status fetches */
240#define USB_STS_TIMEOUT 1000
241#define USB_STS_RETRIES 5
242
243/*
244 * USB 2.0 spec Section 11.24.2.6
245 */
246static int get_hub_status(struct usb_device *hdev,
247 struct usb_hub_status *data)
248{
249 int i, status = -ETIMEDOUT;
250
251 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
252 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
253 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
254 data, sizeof(*data), USB_STS_TIMEOUT);
255 }
256 return status;
257}
258
259/*
260 * USB 2.0 spec Section 11.24.2.7
261 */
262static int get_port_status(struct usb_device *hdev, int port1,
263 struct usb_port_status *data)
264{
265 int i, status = -ETIMEDOUT;
266
267 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
268 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
269 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
270 data, sizeof(*data), USB_STS_TIMEOUT);
271 }
272 return status;
273}
274
275static void kick_khubd(struct usb_hub *hub)
276{
277 unsigned long flags;
278
279 spin_lock_irqsave(&hub_event_lock, flags);
280 if (list_empty(&hub->event_list)) {
281 list_add_tail(&hub->event_list, &hub_event_list);
282 wake_up(&khubd_wait);
283 }
284 spin_unlock_irqrestore(&hub_event_lock, flags);
285}
286
287void usb_kick_khubd(struct usb_device *hdev)
288{
289 kick_khubd(hdev_to_hub(hdev));
290}
291
292
293/* completion function, fires on port status changes and various faults */
294static void hub_irq(struct urb *urb, struct pt_regs *regs)
295{
296 struct usb_hub *hub = (struct usb_hub *)urb->context;
297 int status;
298 int i;
299 unsigned long bits;
300
301 switch (urb->status) {
302 case -ENOENT: /* synchronous unlink */
303 case -ECONNRESET: /* async unlink */
304 case -ESHUTDOWN: /* hardware going away */
305 return;
306
307 default: /* presumably an error */
308 /* Cause a hub reset after 10 consecutive errors */
309 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
310 if ((++hub->nerrors < 10) || hub->error)
311 goto resubmit;
312 hub->error = urb->status;
313 /* FALL THROUGH */
314
315 /* let khubd handle things */
316 case 0: /* we got data: port status changed */
317 bits = 0;
318 for (i = 0; i < urb->actual_length; ++i)
319 bits |= ((unsigned long) ((*hub->buffer)[i]))
320 << (i*8);
321 hub->event_bits[0] = bits;
322 break;
323 }
324
325 hub->nerrors = 0;
326
327 /* Something happened, let khubd figure it out */
328 kick_khubd(hub);
329
330resubmit:
331 if (hub->quiescing)
332 return;
333
334 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
335 && status != -ENODEV && status != -EPERM)
336 dev_err (hub->intfdev, "resubmit --> %d\n", status);
337}
338
339/* USB 2.0 spec Section 11.24.2.3 */
340static inline int
341hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
342{
343 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
344 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
345 tt, NULL, 0, 1000);
346}
347
348/*
349 * enumeration blocks khubd for a long time. we use keventd instead, since
350 * long blocking there is the exception, not the rule. accordingly, HCDs
351 * talking to TTs must queue control transfers (not just bulk and iso), so
352 * both can talk to the same hub concurrently.
353 */
354static void hub_tt_kevent (void *arg)
355{
356 struct usb_hub *hub = arg;
357 unsigned long flags;
358
359 spin_lock_irqsave (&hub->tt.lock, flags);
360 while (!list_empty (&hub->tt.clear_list)) {
361 struct list_head *temp;
362 struct usb_tt_clear *clear;
363 struct usb_device *hdev = hub->hdev;
364 int status;
365
366 temp = hub->tt.clear_list.next;
367 clear = list_entry (temp, struct usb_tt_clear, clear_list);
368 list_del (&clear->clear_list);
369
370 /* drop lock so HCD can concurrently report other TT errors */
371 spin_unlock_irqrestore (&hub->tt.lock, flags);
372 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
373 spin_lock_irqsave (&hub->tt.lock, flags);
374
375 if (status)
376 dev_err (&hdev->dev,
377 "clear tt %d (%04x) error %d\n",
378 clear->tt, clear->devinfo, status);
1bc3c9e1 379 kfree(clear);
1da177e4
LT		 380 }
381 spin_unlock_irqrestore (&hub->tt.lock, flags);
382}
383
384/**
385 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
386 * @udev: the device whose split transaction failed
387 * @pipe: identifies the endpoint of the failed transaction
388 *
389 * High speed HCDs use this to tell the hub driver that some split control or
390 * bulk transaction failed in a way that requires clearing internal state of
391 * a transaction translator. This is normally detected (and reported) from
392 * interrupt context.
393 *
394 * It may not be possible for that hub to handle additional full (or low)
395 * speed transactions until that state is fully cleared out.
396 */
397void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
398{
399 struct usb_tt *tt = udev->tt;
400 unsigned long flags;
401 struct usb_tt_clear *clear;
402
403 /* we've got to cope with an arbitrary number of pending TT clears,
404 * since each TT has "at least two" buffers that can need it (and
405 * there can be many TTs per hub). even if they're uncommon.
406 */
407 if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) {
408 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
409 /* FIXME recover somehow ... RESET_TT? */
410 return;
411 }
412
413 /* info that CLEAR_TT_BUFFER needs */
414 clear->tt = tt->multi ? udev->ttport : 1;
415 clear->devinfo = usb_pipeendpoint (pipe);
416 clear->devinfo |= udev->devnum << 4;
417 clear->devinfo |= usb_pipecontrol (pipe)
418 ? (USB_ENDPOINT_XFER_CONTROL << 11)
419 : (USB_ENDPOINT_XFER_BULK << 11);
420 if (usb_pipein (pipe))
421 clear->devinfo |= 1 << 15;
422
423 /* tell keventd to clear state for this TT */
424 spin_lock_irqsave (&tt->lock, flags);
425 list_add_tail (&clear->clear_list, &tt->clear_list);
426 schedule_work (&tt->kevent);
427 spin_unlock_irqrestore (&tt->lock, flags);
428}
429
430static void hub_power_on(struct usb_hub *hub)
431{
432 int port1;
b789696a 433 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
74ad9bd2 434 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4
LT		 435
436 /* if hub supports power switching, enable power on each port */
74ad9bd2 437 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) {
1da177e4
LT		 438 dev_dbg(hub->intfdev, "enabling power on all ports\n");
439 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
440 set_port_feature(hub->hdev, port1,
441 USB_PORT_FEAT_POWER);
442 }
443
b789696a
DB		 444 /* Wait at least 100 msec for power to become stable */
445 msleep(max(pgood_delay, (unsigned) 100));
1da177e4
LT		 446}
447
979d5199 448static inline void __hub_quiesce(struct usb_hub *hub)
1da177e4 449{
979d5199 450 /* (nonblocking) khubd and related activity won't re-trigger */
1da177e4 451 hub->quiescing = 1;
c9f89fa4 452 hub->activating = 0;
979d5199
DB		 453 hub->resume_root_hub = 0;
454}
455
456static void hub_quiesce(struct usb_hub *hub)
457{
458 /* (blocking) stop khubd and related activity */
459 __hub_quiesce(hub);
1da177e4
LT		 460 usb_kill_urb(hub->urb);
461 if (hub->has_indicators)
462 cancel_delayed_work(&hub->leds);
463 if (hub->has_indicators || hub->tt.hub)
464 flush_scheduled_work();
465}
466
467static void hub_activate(struct usb_hub *hub)
468{
469 int status;
470
471 hub->quiescing = 0;
472 hub->activating = 1;
979d5199 473 hub->resume_root_hub = 0;
1da177e4
LT		 474 status = usb_submit_urb(hub->urb, GFP_NOIO);
475 if (status < 0)
476 dev_err(hub->intfdev, "activate --> %d\n", status);
477 if (hub->has_indicators && blinkenlights)
478 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
479
480 /* scan all ports ASAP */
481 kick_khubd(hub);
482}
483
484static int hub_hub_status(struct usb_hub *hub,
485 u16 *status, u16 *change)
486{
487 int ret;
488
489 ret = get_hub_status(hub->hdev, &hub->status->hub);
490 if (ret < 0)
491 dev_err (hub->intfdev,
492 "%s failed (err = %d)\n", __FUNCTION__, ret);
493 else {
494 *status = le16_to_cpu(hub->status->hub.wHubStatus);
495 *change = le16_to_cpu(hub->status->hub.wHubChange);
496 ret = 0;
497 }
498 return ret;
499}
500
8b28c752
AS		 501static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
502{
503 struct usb_device *hdev = hub->hdev;
504 int ret;
505
506 if (hdev->children[port1-1] && set_state) {
507 usb_set_device_state(hdev->children[port1-1],
508 USB_STATE_NOTATTACHED);
509 }
510 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
511 if (ret)
512 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
513 port1, ret);
514
515 return ret;
516}
517
1da177e4
LT		 518static int hub_configure(struct usb_hub *hub,
519 struct usb_endpoint_descriptor *endpoint)
520{
521 struct usb_device *hdev = hub->hdev;
522 struct device *hub_dev = hub->intfdev;
523 u16 hubstatus, hubchange;
74ad9bd2 524 u16 wHubCharacteristics;
1da177e4
LT		 525 unsigned int pipe;
526 int maxp, ret;
527 char *message;
528
529 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
530 &hub->buffer_dma);
531 if (!hub->buffer) {
532 message = "can't allocate hub irq buffer";
533 ret = -ENOMEM;
534 goto fail;
535 }
536
537 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
538 if (!hub->status) {
539 message = "can't kmalloc hub status buffer";
540 ret = -ENOMEM;
541 goto fail;
542 }
543
544 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
545 if (!hub->descriptor) {
546 message = "can't kmalloc hub descriptor";
547 ret = -ENOMEM;
548 goto fail;
549 }
550
551 /* Request the entire hub descriptor.
552 * hub->descriptor can handle USB_MAXCHILDREN ports,
553 * but the hub can/will return fewer bytes here.
554 */
555 ret = get_hub_descriptor(hdev, hub->descriptor,
556 sizeof(*hub->descriptor));
557 if (ret < 0) {
558 message = "can't read hub descriptor";
559 goto fail;
560 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
561 message = "hub has too many ports!";
562 ret = -ENODEV;
563 goto fail;
564 }
565
566 hdev->maxchild = hub->descriptor->bNbrPorts;
567 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
568 (hdev->maxchild == 1) ? "" : "s");
569
74ad9bd2 570 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4 571
74ad9bd2 572 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
1da177e4
LT		 573 int i;
574 char portstr [USB_MAXCHILDREN + 1];
575
576 for (i = 0; i < hdev->maxchild; i++)
577 portstr[i] = hub->descriptor->DeviceRemovable
578 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
579 ? 'F' : 'R';
580 portstr[hdev->maxchild] = 0;
581 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
582 } else
583 dev_dbg(hub_dev, "standalone hub\n");
584
74ad9bd2 585 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1da177e4
LT		 586 case 0x00:
587 dev_dbg(hub_dev, "ganged power switching\n");
588 break;
589 case 0x01:
590 dev_dbg(hub_dev, "individual port power switching\n");
591 break;
592 case 0x02:
593 case 0x03:
594 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
595 break;
596 }
597
74ad9bd2 598 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1da177e4
LT		 599 case 0x00:
600 dev_dbg(hub_dev, "global over-current protection\n");
601 break;
602 case 0x08:
603 dev_dbg(hub_dev, "individual port over-current protection\n");
604 break;
605 case 0x10:
606 case 0x18:
607 dev_dbg(hub_dev, "no over-current protection\n");
608 break;
609 }
610
611 spin_lock_init (&hub->tt.lock);
612 INIT_LIST_HEAD (&hub->tt.clear_list);
613 INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
614 switch (hdev->descriptor.bDeviceProtocol) {
615 case 0:
616 break;
617 case 1:
618 dev_dbg(hub_dev, "Single TT\n");
619 hub->tt.hub = hdev;
620 break;
621 case 2:
622 ret = usb_set_interface(hdev, 0, 1);
623 if (ret == 0) {
624 dev_dbg(hub_dev, "TT per port\n");
625 hub->tt.multi = 1;
626 } else
627 dev_err(hub_dev, "Using single TT (err %d)\n",
628 ret);
629 hub->tt.hub = hdev;
630 break;
631 default:
632 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
633 hdev->descriptor.bDeviceProtocol);
634 break;
635 }
636
e09711ae 637 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
74ad9bd2 638 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
e09711ae 639 case HUB_TTTT_8_BITS:
640 if (hdev->descriptor.bDeviceProtocol != 0) {
641 hub->tt.think_time = 666;
642 dev_dbg(hub_dev, "TT requires at most %d "
643 "FS bit times (%d ns)\n",
644 8, hub->tt.think_time);
645 }
1da177e4 646 break;
e09711ae 647 case HUB_TTTT_16_BITS:
648 hub->tt.think_time = 666 * 2;
649 dev_dbg(hub_dev, "TT requires at most %d "
650 "FS bit times (%d ns)\n",
651 16, hub->tt.think_time);
1da177e4 652 break;
e09711ae 653 case HUB_TTTT_24_BITS:
654 hub->tt.think_time = 666 * 3;
655 dev_dbg(hub_dev, "TT requires at most %d "
656 "FS bit times (%d ns)\n",
657 24, hub->tt.think_time);
1da177e4 658 break;
e09711ae 659 case HUB_TTTT_32_BITS:
660 hub->tt.think_time = 666 * 4;
661 dev_dbg(hub_dev, "TT requires at most %d "
662 "FS bit times (%d ns)\n",
663 32, hub->tt.think_time);
1da177e4
LT		 664 break;
665 }
666
667 /* probe() zeroes hub->indicator[] */
74ad9bd2 668 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1da177e4
LT		 669 hub->has_indicators = 1;
670 dev_dbg(hub_dev, "Port indicators are supported\n");
671 }
672
673 dev_dbg(hub_dev, "power on to power good time: %dms\n",
674 hub->descriptor->bPwrOn2PwrGood * 2);
675
676 /* power budgeting mostly matters with bus-powered hubs,
677 * and battery-powered root hubs (may provide just 8 mA).
678 */
679 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
680 if (ret < 0) {
681 message = "can't get hub status";
682 goto fail;
683 }
7d35b929
AS		 684 le16_to_cpus(&hubstatus);
685 if (hdev == hdev->bus->root_hub) {
686 struct usb_hcd *hcd =
687 container_of(hdev->bus, struct usb_hcd, self);
688
689 hub->power_budget = min(500u, hcd->power_budget) / 2;
690 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1da177e4
LT		 691 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
692 hub->descriptor->bHubContrCurrent);
693 hub->power_budget = (501 - hub->descriptor->bHubContrCurrent)
694 / 2;
7d35b929
AS		 695 }
696 if (hub->power_budget)
1da177e4
LT		 697 dev_dbg(hub_dev, "%dmA bus power budget for children\n",
698 hub->power_budget * 2);
1da177e4
LT		 699
700
701 ret = hub_hub_status(hub, &hubstatus, &hubchange);
702 if (ret < 0) {
703 message = "can't get hub status";
704 goto fail;
705 }
706
707 /* local power status reports aren't always correct */
708 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
709 dev_dbg(hub_dev, "local power source is %s\n",
710 (hubstatus & HUB_STATUS_LOCAL_POWER)
711 ? "lost (inactive)" : "good");
712
74ad9bd2 713 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1da177e4
LT		 714 dev_dbg(hub_dev, "%sover-current condition exists\n",
715 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
716
717 /* set up the interrupt endpoint */
718 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
719 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
720
721 if (maxp > sizeof(*hub->buffer))
722 maxp = sizeof(*hub->buffer);
723
724 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
725 if (!hub->urb) {
726 message = "couldn't allocate interrupt urb";
727 ret = -ENOMEM;
728 goto fail;
729 }
730
731 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
732 hub, endpoint->bInterval);
733 hub->urb->transfer_dma = hub->buffer_dma;
734 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
735
736 /* maybe cycle the hub leds */
737 if (hub->has_indicators && blinkenlights)
738 hub->indicator [0] = INDICATOR_CYCLE;
739
740 hub_power_on(hub);
741 hub_activate(hub);
742 return 0;
743
744fail:
745 dev_err (hub_dev, "config failed, %s (err %d)\n",
746 message, ret);
747 /* hub_disconnect() frees urb and descriptor */
748 return ret;
749}
750
751static unsigned highspeed_hubs;
752
bf193d3c
AS		 753/* Called after the hub driver is unbound from a hub with children */
754static void hub_remove_children_work(void *__hub)
755{
756 struct usb_hub *hub = __hub;
757 struct usb_device *hdev = hub->hdev;
758 int i;
759
760 kfree(hub);
761
762 usb_lock_device(hdev);
763 for (i = 0; i < hdev->maxchild; ++i) {
764 if (hdev->children[i])
765 usb_disconnect(&hdev->children[i]);
766 }
767 usb_unlock_device(hdev);
768 usb_put_dev(hdev);
769}
770
1da177e4
LT		 771static void hub_disconnect(struct usb_interface *intf)
772{
773 struct usb_hub *hub = usb_get_intfdata (intf);
774 struct usb_device *hdev;
bf193d3c 775 int n, port1;
1da177e4 776
8b28c752 777 usb_set_intfdata (intf, NULL);
1da177e4
LT		 778 hdev = hub->hdev;
779
780 if (hdev->speed == USB_SPEED_HIGH)
781 highspeed_hubs--;
782
1da177e4
LT		 783 hub_quiesce(hub);
784 usb_free_urb(hub->urb);
785 hub->urb = NULL;
786
787 spin_lock_irq(&hub_event_lock);
788 list_del_init(&hub->event_list);
789 spin_unlock_irq(&hub_event_lock);
790
1bc3c9e1
JJ		 791 kfree(hub->descriptor);
792 hub->descriptor = NULL;
1da177e4 793
1bc3c9e1
JJ		 794 kfree(hub->status);
795 hub->status = NULL;
1da177e4
LT		 796
797 if (hub->buffer) {
798 usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
799 hub->buffer_dma);
800 hub->buffer = NULL;
801 }
802
bf193d3c
AS		 803 /* If there are any children then this is an unbind only, not a
804 * physical disconnection. The active ports must be disabled
805 * and later on we must call usb_disconnect(). We can't call
806 * it now because we may not hold the hub's device lock.
807 */
808 n = 0;
809 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
810 if (hdev->children[port1 - 1]) {
811 ++n;
812 hub_port_disable(hub, port1, 1);
813 }
814 }
815
816 if (n == 0)
817 kfree(hub);
818 else {
819 /* Reuse the hub->leds work_struct for our own purposes */
820 INIT_WORK(&hub->leds, hub_remove_children_work, hub);
821 schedule_work(&hub->leds);
822 usb_get_dev(hdev);
823 }
1da177e4
LT		 824}
825
826static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
827{
828 struct usb_host_interface *desc;
829 struct usb_endpoint_descriptor *endpoint;
830 struct usb_device *hdev;
831 struct usb_hub *hub;
832
833 desc = intf->cur_altsetting;
834 hdev = interface_to_usbdev(intf);
835
836 /* Some hubs have a subclass of 1, which AFAICT according to the */
837 /* specs is not defined, but it works */
838 if ((desc->desc.bInterfaceSubClass != 0) &&
839 (desc->desc.bInterfaceSubClass != 1)) {
840descriptor_error:
841 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
842 return -EIO;
843 }
844
845 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
846 if (desc->desc.bNumEndpoints != 1)
847 goto descriptor_error;
848
849 endpoint = &desc->endpoint[0].desc;
850
851 /* Output endpoint? Curiouser and curiouser.. */
852 if (!(endpoint->bEndpointAddress & USB_DIR_IN))
853 goto descriptor_error;
854
855 /* If it's not an interrupt endpoint, we'd better punt! */
856 if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
857 != USB_ENDPOINT_XFER_INT)
858 goto descriptor_error;
859
860 /* We found a hub */
861 dev_info (&intf->dev, "USB hub found\n");
862
0a1ef3b5 863 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1da177e4
LT		 864 if (!hub) {
865 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
866 return -ENOMEM;
867 }
868
1da177e4
LT		 869 INIT_LIST_HEAD(&hub->event_list);
870 hub->intfdev = &intf->dev;
871 hub->hdev = hdev;
872 INIT_WORK(&hub->leds, led_work, hub);
873
874 usb_set_intfdata (intf, hub);
875
876 if (hdev->speed == USB_SPEED_HIGH)
877 highspeed_hubs++;
878
879 if (hub_configure(hub, endpoint) >= 0)
880 return 0;
881
882 hub_disconnect (intf);
883 return -ENODEV;
884}
885
886static int
887hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
888{
889 struct usb_device *hdev = interface_to_usbdev (intf);
890
891 /* assert ifno == 0 (part of hub spec) */
892 switch (code) {
893 case USBDEVFS_HUB_PORTINFO: {
894 struct usbdevfs_hub_portinfo *info = user_data;
895 int i;
896
897 spin_lock_irq(&device_state_lock);
898 if (hdev->devnum <= 0)
899 info->nports = 0;
900 else {
901 info->nports = hdev->maxchild;
902 for (i = 0; i < info->nports; i++) {
903 if (hdev->children[i] == NULL)
904 info->port[i] = 0;
905 else
906 info->port[i] =
907 hdev->children[i]->devnum;
908 }
909 }
910 spin_unlock_irq(&device_state_lock);
911
912 return info->nports + 1;
913 }
914
915 default:
916 return -ENOSYS;
917 }
918}
919
920/* caller has locked the hub device */
921static void hub_pre_reset(struct usb_hub *hub)
922{
923 struct usb_device *hdev = hub->hdev;
924 int i;
925
926 for (i = 0; i < hdev->maxchild; ++i) {
927 if (hdev->children[i])
928 usb_disconnect(&hdev->children[i]);
929 }
930 hub_quiesce(hub);
931}
932
933/* caller has locked the hub device */
934static void hub_post_reset(struct usb_hub *hub)
935{
936 hub_activate(hub);
937 hub_power_on(hub);
938}
939
940
941/* grab device/port lock, returning index of that port (zero based).
942 * protects the upstream link used by this device from concurrent
943 * tree operations like suspend, resume, reset, and disconnect, which
944 * apply to everything downstream of a given port.
945 */
946static int locktree(struct usb_device *udev)
947{
948 int t;
949 struct usb_device *hdev;
950
951 if (!udev)
952 return -ENODEV;
953
954 /* root hub is always the first lock in the series */
955 hdev = udev->parent;
956 if (!hdev) {
957 usb_lock_device(udev);
958 return 0;
959 }
960
961 /* on the path from root to us, lock everything from
962 * top down, dropping parent locks when not needed
963 */
964 t = locktree(hdev);
965 if (t < 0)
966 return t;
967 for (t = 0; t < hdev->maxchild; t++) {
968 if (hdev->children[t] == udev) {
969 /* everything is fail-fast once disconnect
970 * processing starts
971 */
972 if (udev->state == USB_STATE_NOTATTACHED)
973 break;
974
975 /* when everyone grabs locks top->bottom,
976 * non-overlapping work may be concurrent
977 */
978 down(&udev->serialize);
979 up(&hdev->serialize);
980 return t + 1;
981 }
982 }
983 usb_unlock_device(hdev);
984 return -ENODEV;
985}
986
987static void recursively_mark_NOTATTACHED(struct usb_device *udev)
988{
989 int i;
990
991 for (i = 0; i < udev->maxchild; ++i) {
992 if (udev->children[i])
993 recursively_mark_NOTATTACHED(udev->children[i]);
994 }
995 udev->state = USB_STATE_NOTATTACHED;
996}
997
998/**
999 * usb_set_device_state - change a device's current state (usbcore, hcds)
1000 * @udev: pointer to device whose state should be changed
1001 * @new_state: new state value to be stored
1002 *
1003 * udev->state is _not_ fully protected by the device lock. Although
1004 * most transitions are made only while holding the lock, the state can
1005 * can change to USB_STATE_NOTATTACHED at almost any time. This
1006 * is so that devices can be marked as disconnected as soon as possible,
1007 * without having to wait for any semaphores to be released. As a result,
1008 * all changes to any device's state must be protected by the
1009 * device_state_lock spinlock.
1010 *
1011 * Once a device has been added to the device tree, all changes to its state
1012 * should be made using this routine. The state should _not_ be set directly.
1013 *
1014 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1015 * Otherwise udev->state is set to new_state, and if new_state is
1016 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1017 * to USB_STATE_NOTATTACHED.
1018 */
1019void usb_set_device_state(struct usb_device *udev,
1020 enum usb_device_state new_state)
1021{
1022 unsigned long flags;
1023
1024 spin_lock_irqsave(&device_state_lock, flags);
1025 if (udev->state == USB_STATE_NOTATTACHED)
1026 ; /* do nothing */
b94dc6b5 1027 else if (new_state != USB_STATE_NOTATTACHED) {
1da177e4 1028 udev->state = new_state;
b94dc6b5
DB		 1029 if (new_state == USB_STATE_CONFIGURED)
1030 device_init_wakeup(&udev->dev,
1031 (udev->actconfig->desc.bmAttributes
1032 & USB_CONFIG_ATT_WAKEUP));
1033 else if (new_state != USB_STATE_SUSPENDED)
1034 device_init_wakeup(&udev->dev, 0);
1035 } else
1da177e4
LT		 1036 recursively_mark_NOTATTACHED(udev);
1037 spin_unlock_irqrestore(&device_state_lock, flags);
1038}
1039EXPORT_SYMBOL(usb_set_device_state);
1040
1041
1042static void choose_address(struct usb_device *udev)
1043{
1044 int devnum;
1045 struct usb_bus *bus = udev->bus;
1046
1047 /* If khubd ever becomes multithreaded, this will need a lock */
1048
1049 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1050 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1051 bus->devnum_next);
1052 if (devnum >= 128)
1053 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1054
1055 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1056
1057 if (devnum < 128) {
1058 set_bit(devnum, bus->devmap.devicemap);
1059 udev->devnum = devnum;
1060 }
1061}
1062
1063static void release_address(struct usb_device *udev)
1064{
1065 if (udev->devnum > 0) {
1066 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1067 udev->devnum = -1;
1068 }
1069}
1070
1071/**
1072 * usb_disconnect - disconnect a device (usbcore-internal)
1073 * @pdev: pointer to device being disconnected
1074 * Context: !in_interrupt ()
1075 *
1076 * Something got disconnected. Get rid of it and all of its children.
1077 *
1078 * If *pdev is a normal device then the parent hub must already be locked.
1079 * If *pdev is a root hub then this routine will acquire the
1080 * usb_bus_list_lock on behalf of the caller.
1081 *
1082 * Only hub drivers (including virtual root hub drivers for host
1083 * controllers) should ever call this.
1084 *
1085 * This call is synchronous, and may not be used in an interrupt context.
1086 */
1087void usb_disconnect(struct usb_device **pdev)
1088{
1089 struct usb_device *udev = *pdev;
1090 int i;
1091
1092 if (!udev) {
1093 pr_debug ("%s nodev\n", __FUNCTION__);
1094 return;
1095 }
1096
1097 /* mark the device as inactive, so any further urb submissions for
1098 * this device (and any of its children) will fail immediately.
1099 * this quiesces everyting except pending urbs.
1100 */
1101 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1102
1103 /* lock the bus list on behalf of HCDs unregistering their root hubs */
1104 if (!udev->parent) {
1105 down(&usb_bus_list_lock);
1106 usb_lock_device(udev);
1107 } else
1108 down(&udev->serialize);
1109
1110 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1111
1112 /* Free up all the children before we remove this device */
1113 for (i = 0; i < USB_MAXCHILDREN; i++) {
1114 if (udev->children[i])
1115 usb_disconnect(&udev->children[i]);
1116 }
1117
1118 /* deallocate hcd/hardware state ... nuking all pending urbs and
1119 * cleaning up all state associated with the current configuration
1120 * so that the hardware is now fully quiesced.
1121 */
1122 usb_disable_device(udev, 0);
1123
3099e75a
GKH		 1124 usb_notify_remove_device(udev);
1125
1da177e4
LT		 1126 /* Free the device number, remove the /proc/bus/usb entry and
1127 * the sysfs attributes, and delete the parent's children[]
1128 * (or root_hub) pointer.
1129 */
1130 dev_dbg (&udev->dev, "unregistering device\n");
1131 release_address(udev);
1da177e4
LT		 1132 usb_remove_sysfs_dev_files(udev);
1133
1134 /* Avoid races with recursively_mark_NOTATTACHED() */
1135 spin_lock_irq(&device_state_lock);
1136 *pdev = NULL;
1137 spin_unlock_irq(&device_state_lock);
1138
1139 if (!udev->parent) {
1140 usb_unlock_device(udev);
1141 up(&usb_bus_list_lock);
1142 } else
1143 up(&udev->serialize);
1144
1145 device_unregister(&udev->dev);
1146}
1147
1148static int choose_configuration(struct usb_device *udev)
1149{
1150 int c, i;
1151
1152 /* NOTE: this should interact with hub power budgeting */
1153
1154 c = udev->config[0].desc.bConfigurationValue;
1155 if (udev->descriptor.bNumConfigurations != 1) {
1156 for (i = 0; i < udev->descriptor.bNumConfigurations; i++) {
1157 struct usb_interface_descriptor *desc;
1158
1159 /* heuristic: Linux is more likely to have class
1160 * drivers, so avoid vendor-specific interfaces.
1161 */
1162 desc = &udev->config[i].intf_cache[0]
1163 ->altsetting->desc;
1164 if (desc->bInterfaceClass == USB_CLASS_VENDOR_SPEC)
1165 continue;
1166 /* COMM/2/all is CDC ACM, except 0xff is MSFT RNDIS.
1167 * MSFT needs this to be the first config; never use
1168 * it as the default unless Linux has host-side RNDIS.
1169 * A second config would ideally be CDC-Ethernet, but
1170 * may instead be the "vendor specific" CDC subset
1171 * long used by ARM Linux for sa1100 or pxa255.
1172 */
1173 if (desc->bInterfaceClass == USB_CLASS_COMM
1174 && desc->bInterfaceSubClass == 2
1175 && desc->bInterfaceProtocol == 0xff) {
1176 c = udev->config[1].desc.bConfigurationValue;
1177 continue;
1178 }
1179 c = udev->config[i].desc.bConfigurationValue;
1180 break;
1181 }
1182 dev_info(&udev->dev,
1183 "configuration #%d chosen from %d choices\n",
1184 c, udev->descriptor.bNumConfigurations);
1185 }
1186 return c;
1187}
1188
1189#ifdef DEBUG
1190static void show_string(struct usb_device *udev, char *id, char *string)
1191{
1192 if (!string)
1193 return;
1194 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1195}
1196
1197#else
1198static inline void show_string(struct usb_device *udev, char *id, char *string)
1199{}
1200#endif
1201
1da177e4
LT		 1202
1203#ifdef CONFIG_USB_OTG
1204#include "otg_whitelist.h"
1205#endif
1206
1207/**
1208 * usb_new_device - perform initial device setup (usbcore-internal)
1209 * @udev: newly addressed device (in ADDRESS state)
1210 *
1211 * This is called with devices which have been enumerated, but not yet
1212 * configured. The device descriptor is available, but not descriptors
1213 * for any device configuration. The caller must have locked udev and
1214 * either the parent hub (if udev is a normal device) or else the
1215 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1216 * udev has already been installed, but udev is not yet visible through
1217 * sysfs or other filesystem code.
1218 *
1219 * Returns 0 for success (device is configured and listed, with its
1220 * interfaces, in sysfs); else a negative errno value.
1221 *
1222 * This call is synchronous, and may not be used in an interrupt context.
1223 *
1224 * Only the hub driver should ever call this; root hub registration
1225 * uses it indirectly.
1226 */
1227int usb_new_device(struct usb_device *udev)
1228{
1229 int err;
1230 int c;
1231
1232 err = usb_get_configuration(udev);
1233 if (err < 0) {
1234 dev_err(&udev->dev, "can't read configurations, error %d\n",
1235 err);
1236 goto fail;
1237 }
1238
1239 /* read the standard strings and cache them if present */
4f62efe6
AS		 1240 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1241 udev->manufacturer = usb_cache_string(udev,
1242 udev->descriptor.iManufacturer);
1243 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1da177e4
LT		 1244
1245 /* Tell the world! */
1246 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1247 "SerialNumber=%d\n",
1248 udev->descriptor.iManufacturer,
1249 udev->descriptor.iProduct,
1250 udev->descriptor.iSerialNumber);
1251 show_string(udev, "Product", udev->product);
1252 show_string(udev, "Manufacturer", udev->manufacturer);
1253 show_string(udev, "SerialNumber", udev->serial);
1254
1255#ifdef CONFIG_USB_OTG
1256 /*
1257 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1258 * to wake us after we've powered off VBUS; and HNP, switching roles
1259 * "host" to "peripheral". The OTG descriptor helps figure this out.
1260 */
1261 if (!udev->bus->is_b_host
1262 && udev->config
1263 && udev->parent == udev->bus->root_hub) {
1264 struct usb_otg_descriptor *desc = 0;
1265 struct usb_bus *bus = udev->bus;
1266
1267 /* descriptor may appear anywhere in config */
1268 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1269 le16_to_cpu(udev->config[0].desc.wTotalLength),
1270 USB_DT_OTG, (void **) &desc) == 0) {
1271 if (desc->bmAttributes & USB_OTG_HNP) {
1272 unsigned port1;
1273 struct usb_device *root = udev->parent;
1274
1275 for (port1 = 1; port1 <= root->maxchild;
1276 port1++) {
1277 if (root->children[port1-1] == udev)
1278 break;
1279 }
1280
1281 dev_info(&udev->dev,
1282 "Dual-Role OTG device on %sHNP port\n",
1283 (port1 == bus->otg_port)
1284 ? "" : "non-");
1285
1286 /* enable HNP before suspend, it's simpler */
1287 if (port1 == bus->otg_port)
1288 bus->b_hnp_enable = 1;
1289 err = usb_control_msg(udev,
1290 usb_sndctrlpipe(udev, 0),
1291 USB_REQ_SET_FEATURE, 0,
1292 bus->b_hnp_enable
1293 ? USB_DEVICE_B_HNP_ENABLE
1294 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1295 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1296 if (err < 0) {
1297 /* OTG MESSAGE: report errors here,
1298 * customize to match your product.
1299 */
1300 dev_info(&udev->dev,
1301 "can't set HNP mode; %d\n",
1302 err);
1303 bus->b_hnp_enable = 0;
1304 }
1305 }
1306 }
1307 }
1308
1309 if (!is_targeted(udev)) {
1310
1311 /* Maybe it can talk to us, though we can't talk to it.
1312 * (Includes HNP test device.)
1313 */
1314 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
390a8c34
DB		 1315 static int __usb_suspend_device(struct usb_device *,
1316 int port1);
1317 err = __usb_suspend_device(udev, udev->bus->otg_port);
1da177e4
LT		 1318 if (err < 0)
1319 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1320 }
1321 err = -ENODEV;
1322 goto fail;
1323 }
1324#endif
1325
1326 /* put device-specific files into sysfs */
1327 err = device_add (&udev->dev);
1328 if (err) {
1329 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1330 goto fail;
1331 }
1332 usb_create_sysfs_dev_files (udev);
1333
1334 /* choose and set the configuration. that registers the interfaces
1335 * with the driver core, and lets usb device drivers bind to them.
1336 */
1337 c = choose_configuration(udev);
1338 if (c < 0)
1339 dev_warn(&udev->dev,
1340 "can't choose an initial configuration\n");
1341 else {
1342 err = usb_set_configuration(udev, c);
1343 if (err) {
1344 dev_err(&udev->dev, "can't set config #%d, error %d\n",
1345 c, err);
1346 usb_remove_sysfs_dev_files(udev);
1347 device_del(&udev->dev);
1348 goto fail;
1349 }
1350 }
1351
1352 /* USB device state == configured ... usable */
3099e75a 1353 usb_notify_add_device(udev);
1da177e4 1354
1da177e4
LT		 1355 return 0;
1356
1357fail:
1358 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1359 return err;
1360}
1361
1362
1363static int hub_port_status(struct usb_hub *hub, int port1,
1364 u16 *status, u16 *change)
1365{
1366 int ret;
1367
1368 ret = get_port_status(hub->hdev, port1, &hub->status->port);
1369 if (ret < 0)
1370 dev_err (hub->intfdev,
1371 "%s failed (err = %d)\n", __FUNCTION__, ret);
1372 else {
1373 *status = le16_to_cpu(hub->status->port.wPortStatus);
1374 *change = le16_to_cpu(hub->status->port.wPortChange);
1375 ret = 0;
1376 }
1377 return ret;
1378}
1379
1380#define PORT_RESET_TRIES 5
1381#define SET_ADDRESS_TRIES 2
1382#define GET_DESCRIPTOR_TRIES 2
1383#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1384#define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1385
1386#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1387#define HUB_SHORT_RESET_TIME 10
1388#define HUB_LONG_RESET_TIME 200
1389#define HUB_RESET_TIMEOUT 500
1390
1391static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1392 struct usb_device *udev, unsigned int delay)
1393{
1394 int delay_time, ret;
1395 u16 portstatus;
1396 u16 portchange;
1397
1398 for (delay_time = 0;
1399 delay_time < HUB_RESET_TIMEOUT;
1400 delay_time += delay) {
1401 /* wait to give the device a chance to reset */
1402 msleep(delay);
1403
1404 /* read and decode port status */
1405 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1406 if (ret < 0)
1407 return ret;
1408
1409 /* Device went away? */
1410 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1411 return -ENOTCONN;
1412
1413 /* bomb out completely if something weird happened */
1414 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1415 return -EINVAL;
1416
1417 /* if we`ve finished resetting, then break out of the loop */
1418 if (!(portstatus & USB_PORT_STAT_RESET) &&
1419 (portstatus & USB_PORT_STAT_ENABLE)) {
1420 if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1421 udev->speed = USB_SPEED_HIGH;
1422 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1423 udev->speed = USB_SPEED_LOW;
1424 else
1425 udev->speed = USB_SPEED_FULL;
1426 return 0;
1427 }
1428
1429 /* switch to the long delay after two short delay failures */
1430 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1431 delay = HUB_LONG_RESET_TIME;
1432
1433 dev_dbg (hub->intfdev,
1434 "port %d not reset yet, waiting %dms\n",
1435 port1, delay);
1436 }
1437
1438 return -EBUSY;
1439}
1440
1441static int hub_port_reset(struct usb_hub *hub, int port1,
1442 struct usb_device *udev, unsigned int delay)
1443{
1444 int i, status;
1445
1446 /* Reset the port */
1447 for (i = 0; i < PORT_RESET_TRIES; i++) {
1448 status = set_port_feature(hub->hdev,
1449 port1, USB_PORT_FEAT_RESET);
1450 if (status)
1451 dev_err(hub->intfdev,
1452 "cannot reset port %d (err = %d)\n",
1453 port1, status);
1454 else {
1455 status = hub_port_wait_reset(hub, port1, udev, delay);
dd16525b 1456 if (status && status != -ENOTCONN)
1da177e4
LT		 1457 dev_dbg(hub->intfdev,
1458 "port_wait_reset: err = %d\n",
1459 status);
1460 }
1461
1462 /* return on disconnect or reset */
1463 switch (status) {
1464 case 0:
b789696a
DB		 1465 /* TRSTRCY = 10 ms; plus some extra */
1466 msleep(10 + 40);
1da177e4
LT		 1467 /* FALL THROUGH */
1468 case -ENOTCONN:
1469 case -ENODEV:
1470 clear_port_feature(hub->hdev,
1471 port1, USB_PORT_FEAT_C_RESET);
1472 /* FIXME need disconnect() for NOTATTACHED device */
1473 usb_set_device_state(udev, status
1474 ? USB_STATE_NOTATTACHED
1475 : USB_STATE_DEFAULT);
1476 return status;
1477 }
1478
1479 dev_dbg (hub->intfdev,
1480 "port %d not enabled, trying reset again...\n",
1481 port1);
1482 delay = HUB_LONG_RESET_TIME;
1483 }
1484
1485 dev_err (hub->intfdev,
1486 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1487 port1);
1488
1489 return status;
1490}
1491
1da177e4
LT		 1492/*
1493 * Disable a port and mark a logical connnect-change event, so that some
1494 * time later khubd will disconnect() any existing usb_device on the port
1495 * and will re-enumerate if there actually is a device attached.
1496 */
1497static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
1498{
1499 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
1500 hub_port_disable(hub, port1, 1);
1501
1502 /* FIXME let caller ask to power down the port:
1503 * - some devices won't enumerate without a VBUS power cycle
1504 * - SRP saves power that way
390a8c34 1505 * - ... new call, TBD ...
1da177e4
LT		 1506 * That's easy if this hub can switch power per-port, and
1507 * khubd reactivates the port later (timer, SRP, etc).
1508 * Powerdown must be optional, because of reset/DFU.
1509 */
1510
1511 set_bit(port1, hub->change_bits);
1512 kick_khubd(hub);
1513}
1514
1515
1516#ifdef CONFIG_USB_SUSPEND
1517
1518/*
1519 * Selective port suspend reduces power; most suspended devices draw
1520 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1521 * All devices below the suspended port are also suspended.
1522 *
1523 * Devices leave suspend state when the host wakes them up. Some devices
1524 * also support "remote wakeup", where the device can activate the USB
1525 * tree above them to deliver data, such as a keypress or packet. In
1526 * some cases, this wakes the USB host.
1527 */
1528static int hub_port_suspend(struct usb_hub *hub, int port1,
1529 struct usb_device *udev)
1530{
1531 int status;
1532
1533 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1534
1535 /* enable remote wakeup when appropriate; this lets the device
1536 * wake up the upstream hub (including maybe the root hub).
1537 *
1538 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1539 * we don't explicitly enable it here.
1540 */
b94dc6b5 1541 if (device_may_wakeup(&udev->dev)) {
1da177e4
LT		 1542 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1543 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1544 USB_DEVICE_REMOTE_WAKEUP, 0,
1545 NULL, 0,
1546 USB_CTRL_SET_TIMEOUT);
1547 if (status)
1548 dev_dbg(&udev->dev,
1549 "won't remote wakeup, status %d\n",
1550 status);
1551 }
1552
1553 /* see 7.1.7.6 */
1554 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1555 if (status) {
1556 dev_dbg(hub->intfdev,
1557 "can't suspend port %d, status %d\n",
1558 port1, status);
1559 /* paranoia: "should not happen" */
1560 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1561 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1562 USB_DEVICE_REMOTE_WAKEUP, 0,
1563 NULL, 0,
1564 USB_CTRL_SET_TIMEOUT);
1565 } else {
1566 /* device has up to 10 msec to fully suspend */
1567 dev_dbg(&udev->dev, "usb suspend\n");
1568 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1569 msleep(10);
1570 }
1571 return status;
1572}
1573
1574/*
1575 * Devices on USB hub ports have only one "suspend" state, corresponding
ba9d35fb 1576 * to ACPI D2, "may cause the device to lose some context".
1da177e4
LT		 1577 * State transitions include:
1578 *
1579 * - suspend, resume ... when the VBUS power link stays live
1580 * - suspend, disconnect ... VBUS lost
1581 *
1582 * Once VBUS drop breaks the circuit, the port it's using has to go through
1583 * normal re-enumeration procedures, starting with enabling VBUS power.
1584 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1585 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1586 * timer, no SRP, no requests through sysfs.
390a8c34
DB		 1587 *
1588 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1589 * the root hub for their bus goes into global suspend ... so we don't
1590 * (falsely) update the device power state to say it suspended.
1da177e4 1591 */
390a8c34 1592static int __usb_suspend_device (struct usb_device *udev, int port1)
1da177e4 1593{
f3f3253d 1594 int status = 0;
1da177e4
LT		 1595
1596 /* caller owns the udev device lock */
1597 if (port1 < 0)
1598 return port1;
1599
1600 if (udev->state == USB_STATE_SUSPENDED
1601 || udev->state == USB_STATE_NOTATTACHED) {
1602 return 0;
1603 }
1604
c9f89fa4 1605 /* all interfaces must already be suspended */
1da177e4
LT		 1606 if (udev->actconfig) {
1607 int i;
1608
1609 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1610 struct usb_interface *intf;
1da177e4
LT		 1611
1612 intf = udev->actconfig->interface[i];
c9f89fa4
DB		 1613 if (is_active(intf)) {
1614 dev_dbg(&intf->dev, "nyet suspended\n");
1615 return -EBUSY;
1da177e4
LT		 1616 }
1617 }
1618 }
1619
f3f3253d
DB		 1620 /* we only change a device's upstream USB link.
1621 * root hubs have no upstream USB link.
1da177e4 1622 */
f3f3253d 1623 if (udev->parent)
1da177e4
LT		 1624 status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
1625 udev);
1626
1627 if (status == 0)
390a8c34 1628 udev->dev.power.power_state = PMSG_SUSPEND;
1da177e4
LT		 1629 return status;
1630}
1631
f3f3253d
DB		 1632#endif
1633
5edbfb7c 1634/*
1da177e4
LT		 1635 * usb_suspend_device - suspend a usb device
1636 * @udev: device that's no longer in active use
5edbfb7c 1637 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1638 *
1639 * Suspends a USB device that isn't in active use, conserving power.
1640 * Devices may wake out of a suspend, if anything important happens,
1641 * using the remote wakeup mechanism. They may also be taken out of
1642 * suspend by the host, using usb_resume_device(). It's also routine
1643 * to disconnect devices while they are suspended.
1644 *
390a8c34
DB		 1645 * This only affects the USB hardware for a device; its interfaces
1646 * (and, for hubs, child devices) must already have been suspended.
1647 *
1da177e4
LT		 1648 * Suspending OTG devices may trigger HNP, if that's been enabled
1649 * between a pair of dual-role devices. That will change roles, such
1650 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1651 *
1652 * Returns 0 on success, else negative errno.
1653 */
390a8c34 1654int usb_suspend_device(struct usb_device *udev)
1da177e4 1655{
f3f3253d 1656#ifdef CONFIG_USB_SUSPEND
1da177e4
LT		 1657 int port1, status;
1658
1659 port1 = locktree(udev);
1660 if (port1 < 0)
1661 return port1;
1662
390a8c34 1663 status = __usb_suspend_device(udev, port1);
1da177e4
LT		 1664 usb_unlock_device(udev);
1665 return status;
f3f3253d
DB		 1666#else
1667 /* NOTE: udev->state unchanged, it's not lying ... */
1668 udev->dev.power.power_state = PMSG_SUSPEND;
1669 return 0;
1670#endif
1da177e4 1671}
f3f3253d 1672
1da177e4 1673/*
390a8c34
DB		 1674 * If the USB "suspend" state is in use (rather than "global suspend"),
1675 * many devices will be individually taken out of suspend state using
1676 * special" resume" signaling. These routines kick in shortly after
1da177e4
LT		 1677 * hardware resume signaling is finished, either because of selective
1678 * resume (by host) or remote wakeup (by device) ... now see what changed
1679 * in the tree that's rooted at this device.
1680 */
f3f3253d 1681static int finish_device_resume(struct usb_device *udev)
1da177e4
LT		 1682{
1683 int status;
1684 u16 devstatus;
1685
1686 /* caller owns the udev device lock */
f3f3253d 1687 dev_dbg(&udev->dev, "finish resume\n");
1da177e4
LT		 1688
1689 /* usb ch9 identifies four variants of SUSPENDED, based on what
1690 * state the device resumes to. Linux currently won't see the
1691 * first two on the host side; they'd be inside hub_port_init()
1692 * during many timeouts, but khubd can't suspend until later.
1693 */
1694 usb_set_device_state(udev, udev->actconfig
1695 ? USB_STATE_CONFIGURED
1696 : USB_STATE_ADDRESS);
1da177e4
LT		 1697
1698 /* 10.5.4.5 says be sure devices in the tree are still there.
1699 * For now let's assume the device didn't go crazy on resume,
1700 * and device drivers will know about any resume quirks.
1701 */
1702 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1703 if (status < 0)
1704 dev_dbg(&udev->dev,
1705 "gone after usb resume? status %d\n",
1706 status);
1707 else if (udev->actconfig) {
1708 unsigned i;
dbc3887e 1709 int (*resume)(struct device *);
1da177e4
LT		 1710
1711 le16_to_cpus(&devstatus);
f3f3253d
DB		 1712 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)
1713 && udev->parent) {
1da177e4
LT		 1714 status = usb_control_msg(udev,
1715 usb_sndctrlpipe(udev, 0),
1716 USB_REQ_CLEAR_FEATURE,
1717 USB_RECIP_DEVICE,
1718 USB_DEVICE_REMOTE_WAKEUP, 0,
1719 NULL, 0,
1720 USB_CTRL_SET_TIMEOUT);
1721 if (status) {
1722 dev_dbg(&udev->dev, "disable remote "
1723 "wakeup, status %d\n", status);
1724 status = 0;
1725 }
1726 }
1727
1728 /* resume interface drivers; if this is a hub, it
dbc3887e 1729 * may have a child resume event to deal with soon
1da177e4 1730 */
dbc3887e
DB		 1731 resume = udev->dev.bus->resume;
1732 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++)
1733 (void) resume(&udev->actconfig->interface[i]->dev);
1da177e4
LT		 1734 status = 0;
1735
1736 } else if (udev->devnum <= 0) {
1737 dev_dbg(&udev->dev, "bogus resume!\n");
1738 status = -EINVAL;
1739 }
1740 return status;
1741}
1742
f3f3253d
DB		 1743#ifdef CONFIG_USB_SUSPEND
1744
1da177e4
LT		 1745static int
1746hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
1747{
1748 int status;
1749
1750 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1751
1752 /* see 7.1.7.7; affects power usage, but not budgeting */
1753 status = clear_port_feature(hub->hdev,
1754 port1, USB_PORT_FEAT_SUSPEND);
1755 if (status) {
1756 dev_dbg(hub->intfdev,
1757 "can't resume port %d, status %d\n",
1758 port1, status);
1759 } else {
1760 u16 devstatus;
1761 u16 portchange;
1762
1763 /* drive resume for at least 20 msec */
1764 if (udev)
1765 dev_dbg(&udev->dev, "RESUME\n");
1766 msleep(25);
1767
1768#define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1769 | USB_PORT_STAT_ENABLE \
1770 | USB_PORT_STAT_CONNECTION)
1771
1772 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1773 * stop resume signaling. Then finish the resume
1774 * sequence.
1775 */
1776 devstatus = portchange = 0;
1777 status = hub_port_status(hub, port1,
1778 &devstatus, &portchange);
1779 if (status < 0
1780 || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
1781 || (devstatus & USB_PORT_STAT_SUSPEND) != 0
1782 ) {
1783 dev_dbg(hub->intfdev,
1784 "port %d status %04x.%04x after resume, %d\n",
1785 port1, portchange, devstatus, status);
1786 } else {
1787 /* TRSMRCY = 10 msec */
1788 msleep(10);
1789 if (udev)
f3f3253d 1790 status = finish_device_resume(udev);
1da177e4
LT		 1791 }
1792 }
1793 if (status < 0)
1794 hub_port_logical_disconnect(hub, port1);
1795
1796 return status;
1797}
1798
f3f3253d 1799#endif
1da177e4 1800
5edbfb7c 1801/*
1da177e4
LT		 1802 * usb_resume_device - re-activate a suspended usb device
1803 * @udev: device to re-activate
5edbfb7c 1804 * Context: must be able to sleep; device not locked; pm locks held
1da177e4
LT		 1805 *
1806 * This will re-activate the suspended device, increasing power usage
1807 * while letting drivers communicate again with its endpoints.
1808 * USB resume explicitly guarantees that the power session between
1809 * the host and the device is the same as it was when the device
1810 * suspended.
1811 *
1812 * Returns 0 on success, else negative errno.
1813 */
1814int usb_resume_device(struct usb_device *udev)
1815{
1816 int port1, status;
1817
1818 port1 = locktree(udev);
1819 if (port1 < 0)
1820 return port1;
1821
f3f3253d
DB		 1822#ifdef CONFIG_USB_SUSPEND
1823 /* selective resume of one downstream hub-to-device port */
1824 if (udev->parent) {
1825 if (udev->state == USB_STATE_SUSPENDED) {
1826 // NOTE swsusp may bork us, device state being wrong...
1827 // NOTE this fails if parent is also suspended...
1828 status = hub_port_resume(hdev_to_hub(udev->parent),
1829 port1, udev);
1da177e4 1830 } else
f3f3253d
DB		 1831 status = 0;
1832 } else
1833#endif
1834 status = finish_device_resume(udev);
1835 if (status < 0)
1da177e4
LT		 1836 dev_dbg(&udev->dev, "can't resume, status %d\n",
1837 status);
1da177e4
LT		 1838
1839 usb_unlock_device(udev);
1840
1841 /* rebind drivers that had no suspend() */
1842 if (status == 0) {
1843 usb_lock_all_devices();
1844 bus_rescan_devices(&usb_bus_type);
1845 usb_unlock_all_devices();
1846 }
1847 return status;
1848}
1849
1850static int remote_wakeup(struct usb_device *udev)
1851{
1852 int status = 0;
1853
f3f3253d
DB		 1854#ifdef CONFIG_USB_SUSPEND
1855
1da177e4
LT		 1856 /* don't repeat RESUME sequence if this device
1857 * was already woken up by some other task
1858 */
1859 down(&udev->serialize);
1860 if (udev->state == USB_STATE_SUSPENDED) {
1861 dev_dbg(&udev->dev, "RESUME (wakeup)\n");
1862 /* TRSMRCY = 10 msec */
1863 msleep(10);
f3f3253d 1864 status = finish_device_resume(udev);
1da177e4
LT		 1865 }
1866 up(&udev->serialize);
f3f3253d 1867#endif
1da177e4
LT		 1868 return status;
1869}
1870
db690874 1871static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1da177e4
LT		 1872{
1873 struct usb_hub *hub = usb_get_intfdata (intf);
1874 struct usb_device *hdev = hub->hdev;
1875 unsigned port1;
1da177e4 1876
c9f89fa4 1877 /* fail if children aren't already suspended */
1da177e4
LT		 1878 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1879 struct usb_device *udev;
1880
1881 udev = hdev->children [port1-1];
f3f3253d
DB		 1882 if (udev && (udev->dev.power.power_state.event
1883 == PM_EVENT_ON
1884#ifdef CONFIG_USB_SUSPEND
1885 || udev->state != USB_STATE_SUSPENDED
1886#endif
1887 )) {
c9f89fa4
DB		 1888 dev_dbg(&intf->dev, "port %d nyet suspended\n", port1);
1889 return -EBUSY;
1890 }
1da177e4
LT		 1891 }
1892
f3f3253d
DB		 1893 /* "global suspend" of the downstream HC-to-USB interface */
1894 if (!hdev->parent) {
1895 struct usb_bus *bus = hdev->bus;
0c0382e3
AS		 1896 if (bus) {
1897 int status = hcd_bus_suspend (bus);
f3f3253d
DB		 1898
1899 if (status != 0) {
1900 dev_dbg(&hdev->dev, "'global' suspend %d\n",
1901 status);
1902 return status;
1903 }
1904 } else
1905 return -EOPNOTSUPP;
1906 }
1907
c9f89fa4
DB		 1908 /* stop khubd and related activity */
1909 hub_quiesce(hub);
1da177e4
LT		 1910 return 0;
1911}
1912
1913static int hub_resume(struct usb_interface *intf)
1914{
1915 struct usb_device *hdev = interface_to_usbdev(intf);
1916 struct usb_hub *hub = usb_get_intfdata (intf);
1da177e4
LT		 1917 int status;
1918
f3f3253d
DB		 1919 /* "global resume" of the downstream HC-to-USB interface */
1920 if (!hdev->parent) {
1921 struct usb_bus *bus = hdev->bus;
0c0382e3
AS		 1922 if (bus) {
1923 status = hcd_bus_resume (bus);
f3f3253d
DB		 1924 if (status) {
1925 dev_dbg(&intf->dev, "'global' resume %d\n",
1926 status);
1927 return status;
1928 }
1929 } else
1930 return -EOPNOTSUPP;
1931 if (status == 0) {
1932 /* TRSMRCY = 10 msec */
1933 msleep(10);
1934 }
1935 }
1936
1937 hub_activate(hub);
1938
1939 /* REVISIT: this recursion probably shouldn't exist. Remove
1940 * this code sometime, after retesting with different root and
1941 * external hubs.
1942 */
1943#ifdef CONFIG_USB_SUSPEND
1944 {
1945 unsigned port1;
1946
1da177e4
LT		 1947 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1948 struct usb_device *udev;
1949 u16 portstat, portchange;
1950
1951 udev = hdev->children [port1-1];
1952 status = hub_port_status(hub, port1, &portstat, &portchange);
1953 if (status == 0) {
1954 if (portchange & USB_PORT_STAT_C_SUSPEND) {
1955 clear_port_feature(hdev, port1,
1956 USB_PORT_FEAT_C_SUSPEND);
1957 portchange &= ~USB_PORT_STAT_C_SUSPEND;
1958 }
1959
1960 /* let khubd handle disconnects etc */
1961 if (portchange)
1962 continue;
1963 }
1964
1965 if (!udev || status < 0)
1966 continue;
1967 down (&udev->serialize);
1968 if (portstat & USB_PORT_STAT_SUSPEND)
1969 status = hub_port_resume(hub, port1, udev);
1970 else {
f3f3253d 1971 status = finish_device_resume(udev);
1da177e4
LT		 1972 if (status < 0) {
1973 dev_dbg(&intf->dev, "resume port %d --> %d\n",
1974 port1, status);
1975 hub_port_logical_disconnect(hub, port1);
1976 }
1977 }
1978 up(&udev->serialize);
1979 }
f3f3253d
DB		 1980 }
1981#endif
1da177e4
LT		 1982 return 0;
1983}
1984
979d5199
DB		 1985void usb_suspend_root_hub(struct usb_device *hdev)
1986{
1987 struct usb_hub *hub = hdev_to_hub(hdev);
1988
1989 /* This also makes any led blinker stop retriggering. We're called
1990 * from irq, so the blinker might still be scheduled. Caller promises
1991 * that the root hub status URB will be canceled.
1992 */
1993 __hub_quiesce(hub);
1994 mark_quiesced(to_usb_interface(hub->intfdev));
1995}
1996
1da177e4
LT		 1997void usb_resume_root_hub(struct usb_device *hdev)
1998{
1999 struct usb_hub *hub = hdev_to_hub(hdev);
2000
2001 hub->resume_root_hub = 1;
2002 kick_khubd(hub);
2003}
2004
1da177e4
LT		 2005
2006/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2007 *
2008 * Between connect detection and reset signaling there must be a delay
2009 * of 100ms at least for debounce and power-settling. The corresponding
2010 * timer shall restart whenever the downstream port detects a disconnect.
2011 *
2012 * Apparently there are some bluetooth and irda-dongles and a number of
2013 * low-speed devices for which this debounce period may last over a second.
2014 * Not covered by the spec - but easy to deal with.
2015 *
2016 * This implementation uses a 1500ms total debounce timeout; if the
2017 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2018 * every 25ms for transient disconnects. When the port status has been
2019 * unchanged for 100ms it returns the port status.
2020 */
2021
2022#define HUB_DEBOUNCE_TIMEOUT 1500
2023#define HUB_DEBOUNCE_STEP 25
2024#define HUB_DEBOUNCE_STABLE 100
2025
2026static int hub_port_debounce(struct usb_hub *hub, int port1)
2027{
2028 int ret;
2029 int total_time, stable_time = 0;
2030 u16 portchange, portstatus;
2031 unsigned connection = 0xffff;
2032
2033 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2034 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2035 if (ret < 0)
2036 return ret;
2037
2038 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2039 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2040 stable_time += HUB_DEBOUNCE_STEP;
2041 if (stable_time >= HUB_DEBOUNCE_STABLE)
2042 break;
2043 } else {
2044 stable_time = 0;
2045 connection = portstatus & USB_PORT_STAT_CONNECTION;
2046 }
2047
2048 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2049 clear_port_feature(hub->hdev, port1,
2050 USB_PORT_FEAT_C_CONNECTION);
2051 }
2052
2053 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2054 break;
2055 msleep(HUB_DEBOUNCE_STEP);
2056 }
2057
2058 dev_dbg (hub->intfdev,
2059 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2060 port1, total_time, stable_time, portstatus);
2061
2062 if (stable_time < HUB_DEBOUNCE_STABLE)
2063 return -ETIMEDOUT;
2064 return portstatus;
2065}
2066
2067static void ep0_reinit(struct usb_device *udev)
2068{
2069 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2070 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2071 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
2072}
2073
2074#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2075#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2076
2077static int hub_set_address(struct usb_device *udev)
2078{
2079 int retval;
2080
2081 if (udev->devnum == 0)
2082 return -EINVAL;
2083 if (udev->state == USB_STATE_ADDRESS)
2084 return 0;
2085 if (udev->state != USB_STATE_DEFAULT)
2086 return -EINVAL;
2087 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2088 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
2089 NULL, 0, USB_CTRL_SET_TIMEOUT);
2090 if (retval == 0) {
2091 usb_set_device_state(udev, USB_STATE_ADDRESS);
2092 ep0_reinit(udev);
2093 }
2094 return retval;
2095}
2096
2097/* Reset device, (re)assign address, get device descriptor.
2098 * Device connection must be stable, no more debouncing needed.
2099 * Returns device in USB_STATE_ADDRESS, except on error.
2100 *
2101 * If this is called for an already-existing device (as part of
2102 * usb_reset_device), the caller must own the device lock. For a
2103 * newly detected device that is not accessible through any global
2104 * pointers, it's not necessary to lock the device.
2105 */
2106static int
2107hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2108 int retry_counter)
2109{
2110 static DECLARE_MUTEX(usb_address0_sem);
2111
2112 struct usb_device *hdev = hub->hdev;
2113 int i, j, retval;
2114 unsigned delay = HUB_SHORT_RESET_TIME;
2115 enum usb_device_speed oldspeed = udev->speed;
2116
2117 /* root hub ports have a slightly longer reset period
2118 * (from USB 2.0 spec, section 7.1.7.5)
2119 */
2120 if (!hdev->parent) {
2121 delay = HUB_ROOT_RESET_TIME;
2122 if (port1 == hdev->bus->otg_port)
2123 hdev->bus->b_hnp_enable = 0;
2124 }
2125
2126 /* Some low speed devices have problems with the quick delay, so */
2127 /* be a bit pessimistic with those devices. RHbug #23670 */
2128 if (oldspeed == USB_SPEED_LOW)
2129 delay = HUB_LONG_RESET_TIME;
2130
2131 down(&usb_address0_sem);
2132
2133 /* Reset the device; full speed may morph to high speed */
2134 retval = hub_port_reset(hub, port1, udev, delay);
2135 if (retval < 0) /* error or disconnect */
2136 goto fail;
2137 /* success, speed is known */
2138 retval = -ENODEV;
2139
2140 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2141 dev_dbg(&udev->dev, "device reset changed speed!\n");
2142 goto fail;
2143 }
2144 oldspeed = udev->speed;
2145
2146 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2147 * it's fixed size except for full speed devices.
2148 */
2149 switch (udev->speed) {
2150 case USB_SPEED_HIGH: /* fixed at 64 */
2151 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2152 break;
2153 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2154 /* to determine the ep0 maxpacket size, try to read
2155 * the device descriptor to get bMaxPacketSize0 and
2156 * then correct our initial guess.
2157 */
2158 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2159 break;
2160 case USB_SPEED_LOW: /* fixed at 8 */
2161 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2162 break;
2163 default:
2164 goto fail;
2165 }
2166
2167 dev_info (&udev->dev,
2168 "%s %s speed USB device using %s and address %d\n",
2169 (udev->config) ? "reset" : "new",
2170 ({ char *speed; switch (udev->speed) {
2171 case USB_SPEED_LOW: speed = "low"; break;
2172 case USB_SPEED_FULL: speed = "full"; break;
2173 case USB_SPEED_HIGH: speed = "high"; break;
2174 default: speed = "?"; break;
2175 }; speed;}),
2176 udev->bus->controller->driver->name,
2177 udev->devnum);
2178
2179 /* Set up TT records, if needed */
2180 if (hdev->tt) {
2181 udev->tt = hdev->tt;
2182 udev->ttport = hdev->ttport;
2183 } else if (udev->speed != USB_SPEED_HIGH
2184 && hdev->speed == USB_SPEED_HIGH) {
2185 udev->tt = &hub->tt;
2186 udev->ttport = port1;
2187 }
2188
2189 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2190 * Because device hardware and firmware is sometimes buggy in
2191 * this area, and this is how Linux has done it for ages.
2192 * Change it cautiously.
2193 *
2194 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2195 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2196 * so it may help with some non-standards-compliant devices.
2197 * Otherwise we start with SET_ADDRESS and then try to read the
2198 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2199 * value.
2200 */
2201 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2202 if (USE_NEW_SCHEME(retry_counter)) {
2203 struct usb_device_descriptor *buf;
2204 int r = 0;
2205
2206#define GET_DESCRIPTOR_BUFSIZE 64
2207 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2208 if (!buf) {
2209 retval = -ENOMEM;
2210 continue;
2211 }
2212
2213 /* Use a short timeout the first time through,
2214 * so that recalcitrant full-speed devices with
2215 * 8- or 16-byte ep0-maxpackets won't slow things
2216 * down tremendously by NAKing the unexpectedly
2217 * early status stage. Also, retry on all errors;
2218 * some devices are flakey.
2219 */
2220 for (j = 0; j < 3; ++j) {
2221 buf->bMaxPacketSize0 = 0;
2222 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2223 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2224 USB_DT_DEVICE << 8, 0,
2225 buf, GET_DESCRIPTOR_BUFSIZE,
2226 (i ? USB_CTRL_GET_TIMEOUT : 1000));
2227 switch (buf->bMaxPacketSize0) {
2228 case 8: case 16: case 32: case 64:
2229 if (buf->bDescriptorType ==
2230 USB_DT_DEVICE) {
2231 r = 0;
2232 break;
2233 }
2234 /* FALL THROUGH */
2235 default:
2236 if (r == 0)
2237 r = -EPROTO;
2238 break;
2239 }
2240 if (r == 0)
2241 break;
2242 }
2243 udev->descriptor.bMaxPacketSize0 =
2244 buf->bMaxPacketSize0;
2245 kfree(buf);
2246
2247 retval = hub_port_reset(hub, port1, udev, delay);
2248 if (retval < 0) /* error or disconnect */
2249 goto fail;
2250 if (oldspeed != udev->speed) {
2251 dev_dbg(&udev->dev,
2252 "device reset changed speed!\n");
2253 retval = -ENODEV;
2254 goto fail;
2255 }
2256 if (r) {
2257 dev_err(&udev->dev, "device descriptor "
2258 "read/%s, error %d\n",
2259 "64", r);
2260 retval = -EMSGSIZE;
2261 continue;
2262 }
2263#undef GET_DESCRIPTOR_BUFSIZE
2264 }
2265
2266 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2267 retval = hub_set_address(udev);
2268 if (retval >= 0)
2269 break;
2270 msleep(200);
2271 }
2272 if (retval < 0) {
2273 dev_err(&udev->dev,
2274 "device not accepting address %d, error %d\n",
2275 udev->devnum, retval);
2276 goto fail;
2277 }
2278
2279 /* cope with hardware quirkiness:
2280 * - let SET_ADDRESS settle, some device hardware wants it
2281 * - read ep0 maxpacket even for high and low speed,
2282 */
2283 msleep(10);
2284 if (USE_NEW_SCHEME(retry_counter))
2285 break;
2286
2287 retval = usb_get_device_descriptor(udev, 8);
2288 if (retval < 8) {
2289 dev_err(&udev->dev, "device descriptor "
2290 "read/%s, error %d\n",
2291 "8", retval);
2292 if (retval >= 0)
2293 retval = -EMSGSIZE;
2294 } else {
2295 retval = 0;
2296 break;
2297 }
2298 }
2299 if (retval)
2300 goto fail;
2301
2302 i = udev->descriptor.bMaxPacketSize0;
2303 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2304 if (udev->speed != USB_SPEED_FULL ||
2305 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2306 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2307 retval = -EMSGSIZE;
2308 goto fail;
2309 }
2310 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2311 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2312 ep0_reinit(udev);
2313 }
2314
2315 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2316 if (retval < (signed)sizeof(udev->descriptor)) {
2317 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2318 "all", retval);
2319 if (retval >= 0)
2320 retval = -ENOMSG;
2321 goto fail;
2322 }
2323
2324 retval = 0;
2325
2326fail:
2327 if (retval)
2328 hub_port_disable(hub, port1, 0);
2329 up(&usb_address0_sem);
2330 return retval;
2331}
2332
2333static void
2334check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2335{
2336 struct usb_qualifier_descriptor *qual;
2337 int status;
2338
2339 qual = kmalloc (sizeof *qual, SLAB_KERNEL);
2340 if (qual == NULL)
2341 return;
2342
2343 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2344 qual, sizeof *qual);
2345 if (status == sizeof *qual) {
2346 dev_info(&udev->dev, "not running at top speed; "
2347 "connect to a high speed hub\n");
2348 /* hub LEDs are probably harder to miss than syslog */
2349 if (hub->has_indicators) {
2350 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2351 schedule_work (&hub->leds);
2352 }
2353 }
1bc3c9e1 2354 kfree(qual);
1da177e4
LT		 2355}
2356
2357static unsigned
2358hub_power_remaining (struct usb_hub *hub)
2359{
2360 struct usb_device *hdev = hub->hdev;
2361 int remaining;
2362 unsigned i;
2363
2364 remaining = hub->power_budget;
2365 if (!remaining) /* self-powered */
2366 return 0;
2367
2368 for (i = 0; i < hdev->maxchild; i++) {
2369 struct usb_device *udev = hdev->children[i];
2370 int delta, ceiling;
2371
2372 if (!udev)
2373 continue;
2374
2375 /* 100mA per-port ceiling, or 8mA for OTG ports */
2376 if (i != (udev->bus->otg_port - 1) || hdev->parent)
2377 ceiling = 50;
2378 else
2379 ceiling = 4;
2380
2381 if (udev->actconfig)
2382 delta = udev->actconfig->desc.bMaxPower;
2383 else
2384 delta = ceiling;
2385 // dev_dbg(&udev->dev, "budgeted %dmA\n", 2 * delta);
2386 if (delta > ceiling)
2387 dev_warn(&udev->dev, "%dmA over %dmA budget!\n",
2388 2 * (delta - ceiling), 2 * ceiling);
2389 remaining -= delta;
2390 }
2391 if (remaining < 0) {
2392 dev_warn(hub->intfdev,
2393 "%dmA over power budget!\n",
2394 -2 * remaining);
2395 remaining = 0;
2396 }
2397 return remaining;
2398}
2399
2400/* Handle physical or logical connection change events.
2401 * This routine is called when:
2402 * a port connection-change occurs;
2403 * a port enable-change occurs (often caused by EMI);
2404 * usb_reset_device() encounters changed descriptors (as from
2405 * a firmware download)
2406 * caller already locked the hub
2407 */
2408static void hub_port_connect_change(struct usb_hub *hub, int port1,
2409 u16 portstatus, u16 portchange)
2410{
2411 struct usb_device *hdev = hub->hdev;
2412 struct device *hub_dev = hub->intfdev;
74ad9bd2 2413 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4
LT		 2414 int status, i;
2415
2416 dev_dbg (hub_dev,
2417 "port %d, status %04x, change %04x, %s\n",
2418 port1, portstatus, portchange, portspeed (portstatus));
2419
2420 if (hub->has_indicators) {
2421 set_port_led(hub, port1, HUB_LED_AUTO);
2422 hub->indicator[port1-1] = INDICATOR_AUTO;
2423 }
2424
2425 /* Disconnect any existing devices under this port */
2426 if (hdev->children[port1-1])
2427 usb_disconnect(&hdev->children[port1-1]);
2428 clear_bit(port1, hub->change_bits);
2429
2430#ifdef CONFIG_USB_OTG
2431 /* during HNP, don't repeat the debounce */
2432 if (hdev->bus->is_b_host)
2433 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2434#endif
2435
2436 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2437 status = hub_port_debounce(hub, port1);
2438 if (status < 0) {
2439 dev_err (hub_dev,
2440 "connect-debounce failed, port %d disabled\n",
2441 port1);
2442 goto done;
2443 }
2444 portstatus = status;
2445 }
2446
2447 /* Return now if nothing is connected */
2448 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2449
2450 /* maybe switch power back on (e.g. root hub was reset) */
74ad9bd2 2451 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
1da177e4
LT		 2452 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2453 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2454
2455 if (portstatus & USB_PORT_STAT_ENABLE)
2456 goto done;
2457 return;
2458 }
2459
2460#ifdef CONFIG_USB_SUSPEND
2461 /* If something is connected, but the port is suspended, wake it up. */
2462 if (portstatus & USB_PORT_STAT_SUSPEND) {
2463 status = hub_port_resume(hub, port1, NULL);
2464 if (status < 0) {
2465 dev_dbg(hub_dev,
2466 "can't clear suspend on port %d; %d\n",
2467 port1, status);
2468 goto done;
2469 }
2470 }
2471#endif
2472
2473 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2474 struct usb_device *udev;
2475
2476 /* reallocate for each attempt, since references
2477 * to the previous one can escape in various ways
2478 */
2479 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2480 if (!udev) {
2481 dev_err (hub_dev,
2482 "couldn't allocate port %d usb_device\n",
2483 port1);
2484 goto done;
2485 }
2486
2487 usb_set_device_state(udev, USB_STATE_POWERED);
2488 udev->speed = USB_SPEED_UNKNOWN;
2489
2490 /* set the address */
2491 choose_address(udev);
2492 if (udev->devnum <= 0) {
2493 status = -ENOTCONN; /* Don't retry */
2494 goto loop;
2495 }
2496
2497 /* reset and get descriptor */
2498 status = hub_port_init(hub, udev, port1, i);
2499 if (status < 0)
2500 goto loop;
2501
2502 /* consecutive bus-powered hubs aren't reliable; they can
2503 * violate the voltage drop budget. if the new child has
2504 * a "powered" LED, users should notice we didn't enable it
2505 * (without reading syslog), even without per-port LEDs
2506 * on the parent.
2507 */
2508 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2509 && hub->power_budget) {
2510 u16 devstat;
2511
2512 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2513 &devstat);
2514 if (status < 0) {
2515 dev_dbg(&udev->dev, "get status %d ?\n", status);
2516 goto loop_disable;
2517 }
2518 cpu_to_le16s(&devstat);
2519 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2520 dev_err(&udev->dev,
2521 "can't connect bus-powered hub "
2522 "to this port\n");
2523 if (hub->has_indicators) {
2524 hub->indicator[port1-1] =
2525 INDICATOR_AMBER_BLINK;
2526 schedule_work (&hub->leds);
2527 }
2528 status = -ENOTCONN; /* Don't retry */
2529 goto loop_disable;
2530 }
2531 }
2532
2533 /* check for devices running slower than they could */
2534 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2535 && udev->speed == USB_SPEED_FULL
2536 && highspeed_hubs != 0)
2537 check_highspeed (hub, udev, port1);
2538
2539 /* Store the parent's children[] pointer. At this point
2540 * udev becomes globally accessible, although presumably
2541 * no one will look at it until hdev is unlocked.
2542 */
2543 down (&udev->serialize);
2544 status = 0;
2545
2546 /* We mustn't add new devices if the parent hub has
2547 * been disconnected; we would race with the
2548 * recursively_mark_NOTATTACHED() routine.
2549 */
2550 spin_lock_irq(&device_state_lock);
2551 if (hdev->state == USB_STATE_NOTATTACHED)
2552 status = -ENOTCONN;
2553 else
2554 hdev->children[port1-1] = udev;
2555 spin_unlock_irq(&device_state_lock);
2556
2557 /* Run it through the hoops (find a driver, etc) */
2558 if (!status) {
2559 status = usb_new_device(udev);
2560 if (status) {
2561 spin_lock_irq(&device_state_lock);
2562 hdev->children[port1-1] = NULL;
2563 spin_unlock_irq(&device_state_lock);
2564 }
2565 }
2566
2567 up (&udev->serialize);
2568 if (status)
2569 goto loop_disable;
2570
2571 status = hub_power_remaining(hub);
2572 if (status)
2573 dev_dbg(hub_dev,
2574 "%dmA power budget left\n",
2575 2 * status);
2576
2577 return;
2578
2579loop_disable:
2580 hub_port_disable(hub, port1, 1);
2581loop:
2582 ep0_reinit(udev);
2583 release_address(udev);
2584 usb_put_dev(udev);
2585 if (status == -ENOTCONN)
2586 break;
2587 }
2588
2589done:
2590 hub_port_disable(hub, port1, 1);
2591}
2592
2593static void hub_events(void)
2594{
2595 struct list_head *tmp;
2596 struct usb_device *hdev;
2597 struct usb_interface *intf;
2598 struct usb_hub *hub;
2599 struct device *hub_dev;
2600 u16 hubstatus;
2601 u16 hubchange;
2602 u16 portstatus;
2603 u16 portchange;
2604 int i, ret;
2605 int connect_change;
2606
2607 /*
2608 * We restart the list every time to avoid a deadlock with
2609 * deleting hubs downstream from this one. This should be
2610 * safe since we delete the hub from the event list.
2611 * Not the most efficient, but avoids deadlocks.
2612 */
2613 while (1) {
2614
2615 /* Grab the first entry at the beginning of the list */
2616 spin_lock_irq(&hub_event_lock);
2617 if (list_empty(&hub_event_list)) {
2618 spin_unlock_irq(&hub_event_lock);
2619 break;
2620 }
2621
2622 tmp = hub_event_list.next;
2623 list_del_init(tmp);
2624
2625 hub = list_entry(tmp, struct usb_hub, event_list);
2626 hdev = hub->hdev;
2627 intf = to_usb_interface(hub->intfdev);
2628 hub_dev = &intf->dev;
2629
979d5199
DB		 2630 i = hub->resume_root_hub;
2631
2632 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n",
1da177e4
LT		 2633 hdev->state, hub->descriptor
2634 ? hub->descriptor->bNbrPorts
2635 : 0,
2636 /* NOTE: expects max 15 ports... */
2637 (u16) hub->change_bits[0],
979d5199
DB		 2638 (u16) hub->event_bits[0],
2639 i ? ", resume root" : "");
1da177e4
LT		 2640
2641 usb_get_intf(intf);
1da177e4
LT		 2642 spin_unlock_irq(&hub_event_lock);
2643
979d5199
DB		 2644 /* Is this is a root hub wanting to reactivate the downstream
2645 * ports? If so, be sure the interface resumes even if its
2646 * stub "device" node was never suspended.
2647 */
2648 if (i) {
979d5199
DB		 2649 dpm_runtime_resume(&hdev->dev);
2650 dpm_runtime_resume(&intf->dev);
2651 }
1da177e4
LT		 2652
2653 /* Lock the device, then check to see if we were
2654 * disconnected while waiting for the lock to succeed. */
2655 if (locktree(hdev) < 0) {
2656 usb_put_intf(intf);
2657 continue;
2658 }
2659 if (hub != usb_get_intfdata(intf))
2660 goto loop;
2661
2662 /* If the hub has died, clean up after it */
2663 if (hdev->state == USB_STATE_NOTATTACHED) {
2664 hub_pre_reset(hub);
2665 goto loop;
2666 }
2667
2668 /* If this is an inactive or suspended hub, do nothing */
2669 if (hub->quiescing)
2670 goto loop;
2671
2672 if (hub->error) {
2673 dev_dbg (hub_dev, "resetting for error %d\n",
2674 hub->error);
2675
2676 ret = usb_reset_device(hdev);
2677 if (ret) {
2678 dev_dbg (hub_dev,
2679 "error resetting hub: %d\n", ret);
2680 goto loop;
2681 }
2682
2683 hub->nerrors = 0;
2684 hub->error = 0;
2685 }
2686
2687 /* deal with port status changes */
2688 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2689 if (test_bit(i, hub->busy_bits))
2690 continue;
2691 connect_change = test_bit(i, hub->change_bits);
2692 if (!test_and_clear_bit(i, hub->event_bits) &&
2693 !connect_change && !hub->activating)
2694 continue;
2695
2696 ret = hub_port_status(hub, i,
2697 &portstatus, &portchange);
2698 if (ret < 0)
2699 continue;
2700
2701 if (hub->activating && !hdev->children[i-1] &&
2702 (portstatus &
2703 USB_PORT_STAT_CONNECTION))
2704 connect_change = 1;
2705
2706 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2707 clear_port_feature(hdev, i,
2708 USB_PORT_FEAT_C_CONNECTION);
2709 connect_change = 1;
2710 }
2711
2712 if (portchange & USB_PORT_STAT_C_ENABLE) {
2713 if (!connect_change)
2714 dev_dbg (hub_dev,
2715 "port %d enable change, "
2716 "status %08x\n",
2717 i, portstatus);
2718 clear_port_feature(hdev, i,
2719 USB_PORT_FEAT_C_ENABLE);
2720
2721 /*
2722 * EM interference sometimes causes badly
2723 * shielded USB devices to be shutdown by
2724 * the hub, this hack enables them again.
2725 * Works at least with mouse driver.
2726 */
2727 if (!(portstatus & USB_PORT_STAT_ENABLE)
2728 && !connect_change
2729 && hdev->children[i-1]) {
2730 dev_err (hub_dev,
2731 "port %i "
2732 "disabled by hub (EMI?), "
2733 "re-enabling...\n",
2734 i);
2735 connect_change = 1;
2736 }
2737 }
2738
2739 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2740 clear_port_feature(hdev, i,
2741 USB_PORT_FEAT_C_SUSPEND);
2742 if (hdev->children[i-1]) {
2743 ret = remote_wakeup(hdev->
2744 children[i-1]);
2745 if (ret < 0)
2746 connect_change = 1;
2747 } else {
2748 ret = -ENODEV;
2749 hub_port_disable(hub, i, 1);
2750 }
2751 dev_dbg (hub_dev,
2752 "resume on port %d, status %d\n",
2753 i, ret);
2754 }
2755
2756 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2757 dev_err (hub_dev,
2758 "over-current change on port %d\n",
2759 i);
2760 clear_port_feature(hdev, i,
2761 USB_PORT_FEAT_C_OVER_CURRENT);
2762 hub_power_on(hub);
2763 }
2764
2765 if (portchange & USB_PORT_STAT_C_RESET) {
2766 dev_dbg (hub_dev,
2767 "reset change on port %d\n",
2768 i);
2769 clear_port_feature(hdev, i,
2770 USB_PORT_FEAT_C_RESET);
2771 }
2772
2773 if (connect_change)
2774 hub_port_connect_change(hub, i,
2775 portstatus, portchange);
2776 } /* end for i */
2777
2778 /* deal with hub status changes */
2779 if (test_and_clear_bit(0, hub->event_bits) == 0)
2780 ; /* do nothing */
2781 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2782 dev_err (hub_dev, "get_hub_status failed\n");
2783 else {
2784 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2785 dev_dbg (hub_dev, "power change\n");
2786 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
2787 }
2788 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2789 dev_dbg (hub_dev, "overcurrent change\n");
2790 msleep(500); /* Cool down */
2791 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2792 hub_power_on(hub);
2793 }
2794 }
2795
2796 hub->activating = 0;
2797
d5926ae7
AS		 2798 /* If this is a root hub, tell the HCD it's okay to
2799 * re-enable port-change interrupts now. */
2800 if (!hdev->parent)
2801 usb_enable_root_hub_irq(hdev->bus);
2802
1da177e4
LT		 2803loop:
2804 usb_unlock_device(hdev);
2805 usb_put_intf(intf);
2806
2807 } /* end while (1) */
2808}
2809
2810static int hub_thread(void *__unused)
2811{
1da177e4
LT		 2812 do {
2813 hub_events();
9c8d6178 2814 wait_event_interruptible(khubd_wait,
2815 !list_empty(&hub_event_list) ||
2816 kthread_should_stop());
3e1d1d28 2817 try_to_freeze();
9c8d6178 2818 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
1da177e4 2819
9c8d6178 2820 pr_debug("%s: khubd exiting\n", usbcore_name);
2821 return 0;
1da177e4
LT		 2822}
2823
2824static struct usb_device_id hub_id_table [] = {
2825 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2826 .bDeviceClass = USB_CLASS_HUB},
2827 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2828 .bInterfaceClass = USB_CLASS_HUB},
2829 { } /* Terminating entry */
2830};
2831
2832MODULE_DEVICE_TABLE (usb, hub_id_table);
2833
2834static struct usb_driver hub_driver = {
2835 .owner = THIS_MODULE,
2836 .name = "hub",
2837 .probe = hub_probe,
2838 .disconnect = hub_disconnect,
2839 .suspend = hub_suspend,
2840 .resume = hub_resume,
2841 .ioctl = hub_ioctl,
2842 .id_table = hub_id_table,
2843};
2844
2845int usb_hub_init(void)
2846{
1da177e4
LT		 2847 if (usb_register(&hub_driver) < 0) {
2848 printk(KERN_ERR "%s: can't register hub driver\n",
2849 usbcore_name);
2850 return -1;
2851 }
2852
9c8d6178 2853 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2854 if (!IS_ERR(khubd_task))
1da177e4 2855 return 0;
1da177e4
LT		 2856
2857 /* Fall through if kernel_thread failed */
2858 usb_deregister(&hub_driver);
2859 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2860
2861 return -1;
2862}
2863
2864void usb_hub_cleanup(void)
2865{
9c8d6178 2866 kthread_stop(khubd_task);
1da177e4
LT		 2867
2868 /*
2869 * Hub resources are freed for us by usb_deregister. It calls
2870 * usb_driver_purge on every device which in turn calls that
2871 * devices disconnect function if it is using this driver.
2872 * The hub_disconnect function takes care of releasing the
2873 * individual hub resources. -greg
2874 */
2875 usb_deregister(&hub_driver);
2876} /* usb_hub_cleanup() */
2877
1da177e4
LT		 2878static int config_descriptors_changed(struct usb_device *udev)
2879{
2880 unsigned index;
2881 unsigned len = 0;
2882 struct usb_config_descriptor *buf;
2883
2884 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2885 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2886 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2887 }
2888 buf = kmalloc (len, SLAB_KERNEL);
2889 if (buf == NULL) {
2890 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2891 /* assume the worst */
2892 return 1;
2893 }
2894 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2895 int length;
2896 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2897
2898 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2899 old_length);
2900 if (length < old_length) {
2901 dev_dbg(&udev->dev, "config index %d, error %d\n",
2902 index, length);
2903 break;
2904 }
2905 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2906 != 0) {
2907 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2908 index, buf->bConfigurationValue);
2909 break;
2910 }
2911 }
2912 kfree(buf);
2913 return index != udev->descriptor.bNumConfigurations;
2914}
2915
2916/**
2917 * usb_reset_device - perform a USB port reset to reinitialize a device
2918 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2919 *
2920 * WARNING - don't reset any device unless drivers for all of its
2921 * interfaces are expecting that reset! Maybe some driver->reset()
2922 * method should eventually help ensure sufficient cooperation.
2923 *
2924 * Do a port reset, reassign the device's address, and establish its
2925 * former operating configuration. If the reset fails, or the device's
2926 * descriptors change from their values before the reset, or the original
2927 * configuration and altsettings cannot be restored, a flag will be set
2928 * telling khubd to pretend the device has been disconnected and then
2929 * re-connected. All drivers will be unbound, and the device will be
2930 * re-enumerated and probed all over again.
2931 *
2932 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2933 * flagged for logical disconnection, or some other negative error code
2934 * if the reset wasn't even attempted.
2935 *
2936 * The caller must own the device lock. For example, it's safe to use
2937 * this from a driver probe() routine after downloading new firmware.
2938 * For calls that might not occur during probe(), drivers should lock
2939 * the device using usb_lock_device_for_reset().
2940 */
2941int usb_reset_device(struct usb_device *udev)
2942{
2943 struct usb_device *parent_hdev = udev->parent;
2944 struct usb_hub *parent_hub;
2945 struct usb_device_descriptor descriptor = udev->descriptor;
2946 struct usb_hub *hub = NULL;
2947 int i, ret = 0, port1 = -1;
2948
2949 if (udev->state == USB_STATE_NOTATTACHED ||
2950 udev->state == USB_STATE_SUSPENDED) {
2951 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2952 udev->state);
2953 return -EINVAL;
2954 }
2955
2956 if (!parent_hdev) {
2957 /* this requires hcd-specific logic; see OHCI hc_restart() */
2958 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2959 return -EISDIR;
2960 }
2961
2962 for (i = 0; i < parent_hdev->maxchild; i++)
2963 if (parent_hdev->children[i] == udev) {
2964 port1 = i + 1;
2965 break;
2966 }
2967
2968 if (port1 < 0) {
2969 /* If this ever happens, it's very bad */
2970 dev_err(&udev->dev, "Can't locate device's port!\n");
2971 return -ENOENT;
2972 }
2973 parent_hub = hdev_to_hub(parent_hdev);
2974
2975 /* If we're resetting an active hub, take some special actions */
2976 if (udev->actconfig &&
2977 udev->actconfig->interface[0]->dev.driver ==
2978 &hub_driver.driver &&
2979 (hub = hdev_to_hub(udev)) != NULL) {
2980 hub_pre_reset(hub);
2981 }
2982
2983 set_bit(port1, parent_hub->busy_bits);
2984 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2985
2986 /* ep0 maxpacket size may change; let the HCD know about it.
2987 * Other endpoints will be handled by re-enumeration. */
2988 ep0_reinit(udev);
2989 ret = hub_port_init(parent_hub, udev, port1, i);
2990 if (ret >= 0)
2991 break;
2992 }
2993 clear_bit(port1, parent_hub->busy_bits);
2994 if (ret < 0)
2995 goto re_enumerate;
2996
2997 /* Device might have changed firmware (DFU or similar) */
2998 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
2999 || config_descriptors_changed (udev)) {
3000 dev_info(&udev->dev, "device firmware changed\n");
3001 udev->descriptor = descriptor; /* for disconnect() calls */
3002 goto re_enumerate;
3003 }
3004
3005 if (!udev->actconfig)
3006 goto done;
3007
3008 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3009 USB_REQ_SET_CONFIGURATION, 0,
3010 udev->actconfig->desc.bConfigurationValue, 0,
3011 NULL, 0, USB_CTRL_SET_TIMEOUT);
3012 if (ret < 0) {
3013 dev_err(&udev->dev,
3014 "can't restore configuration #%d (error=%d)\n",
3015 udev->actconfig->desc.bConfigurationValue, ret);
3016 goto re_enumerate;
3017 }
3018 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3019
3020 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3021 struct usb_interface *intf = udev->actconfig->interface[i];
3022 struct usb_interface_descriptor *desc;
3023
3024 /* set_interface resets host side toggle even
3025 * for altsetting zero. the interface may have no driver.
3026 */
3027 desc = &intf->cur_altsetting->desc;
3028 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3029 desc->bAlternateSetting);
3030 if (ret < 0) {
3031 dev_err(&udev->dev, "failed to restore interface %d "
3032 "altsetting %d (error=%d)\n",
3033 desc->bInterfaceNumber,
3034 desc->bAlternateSetting,
3035 ret);
3036 goto re_enumerate;
3037 }
3038 }
3039
3040done:
3041 if (hub)
3042 hub_post_reset(hub);
3043 return 0;
3044
3045re_enumerate:
3046 hub_port_logical_disconnect(parent_hub, port1);
3047 return -ENODEV;
3048}
Linux kernel - Deliverables
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