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Merge branch 'fix/asoc' into for-linus
[deliverable/linux.git] / drivers / hid / usbhid / hid-core.c
1 /*
2 * USB HID support for Linux
3 *
4 * Copyright (c) 1999 Andreas Gal
5 * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
6 * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
7 * Copyright (c) 2007-2008 Oliver Neukum
8 * Copyright (c) 2006-2010 Jiri Kosina
9 */
10
11 /*
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 2 of the License, or (at your option)
15 * any later version.
16 */
17
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/list.h>
23 #include <linux/mm.h>
24 #include <linux/mutex.h>
25 #include <linux/spinlock.h>
26 #include <asm/unaligned.h>
27 #include <asm/byteorder.h>
28 #include <linux/input.h>
29 #include <linux/wait.h>
30 #include <linux/workqueue.h>
31
32 #include <linux/usb.h>
33
34 #include <linux/hid.h>
35 #include <linux/hiddev.h>
36 #include <linux/hid-debug.h>
37 #include <linux/hidraw.h>
38 #include "usbhid.h"
39
40 /*
41 * Version Information
42 */
43
44 #define DRIVER_DESC "USB HID core driver"
45 #define DRIVER_LICENSE "GPL"
46
47 /*
48 * Module parameters.
49 */
50
51 static unsigned int hid_mousepoll_interval;
52 module_param_named(mousepoll, hid_mousepoll_interval, uint, 0644);
53 MODULE_PARM_DESC(mousepoll, "Polling interval of mice");
54
55 static unsigned int ignoreled;
56 module_param_named(ignoreled, ignoreled, uint, 0644);
57 MODULE_PARM_DESC(ignoreled, "Autosuspend with active leds");
58
59 /* Quirks specified at module load time */
60 static char *quirks_param[MAX_USBHID_BOOT_QUIRKS] = { [ 0 ... (MAX_USBHID_BOOT_QUIRKS - 1) ] = NULL };
61 module_param_array_named(quirks, quirks_param, charp, NULL, 0444);
62 MODULE_PARM_DESC(quirks, "Add/modify USB HID quirks by specifying "
63 " quirks=vendorID:productID:quirks"
64 " where vendorID, productID, and quirks are all in"
65 " 0x-prefixed hex");
66 /*
67 * Input submission and I/O error handler.
68 */
69 static DEFINE_MUTEX(hid_open_mut);
70 static struct workqueue_struct *resumption_waker;
71
72 static void hid_io_error(struct hid_device *hid);
73 static int hid_submit_out(struct hid_device *hid);
74 static int hid_submit_ctrl(struct hid_device *hid);
75 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid);
76
77 /* Start up the input URB */
78 static int hid_start_in(struct hid_device *hid)
79 {
80 unsigned long flags;
81 int rc = 0;
82 struct usbhid_device *usbhid = hid->driver_data;
83
84 spin_lock_irqsave(&usbhid->lock, flags);
85 if (hid->open > 0 &&
86 !test_bit(HID_DISCONNECTED, &usbhid->iofl) &&
87 !test_bit(HID_REPORTED_IDLE, &usbhid->iofl) &&
88 !test_and_set_bit(HID_IN_RUNNING, &usbhid->iofl)) {
89 rc = usb_submit_urb(usbhid->urbin, GFP_ATOMIC);
90 if (rc != 0)
91 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
92 }
93 spin_unlock_irqrestore(&usbhid->lock, flags);
94 return rc;
95 }
96
97 /* I/O retry timer routine */
98 static void hid_retry_timeout(unsigned long _hid)
99 {
100 struct hid_device *hid = (struct hid_device *) _hid;
101 struct usbhid_device *usbhid = hid->driver_data;
102
103 dev_dbg(&usbhid->intf->dev, "retrying intr urb\n");
104 if (hid_start_in(hid))
105 hid_io_error(hid);
106 }
107
108 /* Workqueue routine to reset the device or clear a halt */
109 static void hid_reset(struct work_struct *work)
110 {
111 struct usbhid_device *usbhid =
112 container_of(work, struct usbhid_device, reset_work);
113 struct hid_device *hid = usbhid->hid;
114 int rc = 0;
115
116 if (test_bit(HID_CLEAR_HALT, &usbhid->iofl)) {
117 dev_dbg(&usbhid->intf->dev, "clear halt\n");
118 rc = usb_clear_halt(hid_to_usb_dev(hid), usbhid->urbin->pipe);
119 clear_bit(HID_CLEAR_HALT, &usbhid->iofl);
120 hid_start_in(hid);
121 }
122
123 else if (test_bit(HID_RESET_PENDING, &usbhid->iofl)) {
124 dev_dbg(&usbhid->intf->dev, "resetting device\n");
125 rc = usb_lock_device_for_reset(hid_to_usb_dev(hid), usbhid->intf);
126 if (rc == 0) {
127 rc = usb_reset_device(hid_to_usb_dev(hid));
128 usb_unlock_device(hid_to_usb_dev(hid));
129 }
130 clear_bit(HID_RESET_PENDING, &usbhid->iofl);
131 }
132
133 switch (rc) {
134 case 0:
135 if (!test_bit(HID_IN_RUNNING, &usbhid->iofl))
136 hid_io_error(hid);
137 break;
138 default:
139 err_hid("can't reset device, %s-%s/input%d, status %d",
140 hid_to_usb_dev(hid)->bus->bus_name,
141 hid_to_usb_dev(hid)->devpath,
142 usbhid->ifnum, rc);
143 /* FALLTHROUGH */
144 case -EHOSTUNREACH:
145 case -ENODEV:
146 case -EINTR:
147 break;
148 }
149 }
150
151 /* Main I/O error handler */
152 static void hid_io_error(struct hid_device *hid)
153 {
154 unsigned long flags;
155 struct usbhid_device *usbhid = hid->driver_data;
156
157 spin_lock_irqsave(&usbhid->lock, flags);
158
159 /* Stop when disconnected */
160 if (test_bit(HID_DISCONNECTED, &usbhid->iofl))
161 goto done;
162
163 /* If it has been a while since the last error, we'll assume
164 * this a brand new error and reset the retry timeout. */
165 if (time_after(jiffies, usbhid->stop_retry + HZ/2))
166 usbhid->retry_delay = 0;
167
168 /* When an error occurs, retry at increasing intervals */
169 if (usbhid->retry_delay == 0) {
170 usbhid->retry_delay = 13; /* Then 26, 52, 104, 104, ... */
171 usbhid->stop_retry = jiffies + msecs_to_jiffies(1000);
172 } else if (usbhid->retry_delay < 100)
173 usbhid->retry_delay *= 2;
174
175 if (time_after(jiffies, usbhid->stop_retry)) {
176
177 /* Retries failed, so do a port reset */
178 if (!test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) {
179 schedule_work(&usbhid->reset_work);
180 goto done;
181 }
182 }
183
184 mod_timer(&usbhid->io_retry,
185 jiffies + msecs_to_jiffies(usbhid->retry_delay));
186 done:
187 spin_unlock_irqrestore(&usbhid->lock, flags);
188 }
189
190 static void usbhid_mark_busy(struct usbhid_device *usbhid)
191 {
192 struct usb_interface *intf = usbhid->intf;
193
194 usb_mark_last_busy(interface_to_usbdev(intf));
195 }
196
197 static int usbhid_restart_out_queue(struct usbhid_device *usbhid)
198 {
199 struct hid_device *hid = usb_get_intfdata(usbhid->intf);
200 int kicked;
201
202 if (!hid)
203 return 0;
204
205 if ((kicked = (usbhid->outhead != usbhid->outtail))) {
206 dbg("Kicking head %d tail %d", usbhid->outhead, usbhid->outtail);
207 if (hid_submit_out(hid)) {
208 clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
209 wake_up(&usbhid->wait);
210 }
211 }
212 return kicked;
213 }
214
215 static int usbhid_restart_ctrl_queue(struct usbhid_device *usbhid)
216 {
217 struct hid_device *hid = usb_get_intfdata(usbhid->intf);
218 int kicked;
219
220 WARN_ON(hid == NULL);
221 if (!hid)
222 return 0;
223
224 if ((kicked = (usbhid->ctrlhead != usbhid->ctrltail))) {
225 dbg("Kicking head %d tail %d", usbhid->ctrlhead, usbhid->ctrltail);
226 if (hid_submit_ctrl(hid)) {
227 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
228 wake_up(&usbhid->wait);
229 }
230 }
231 return kicked;
232 }
233
234 /*
235 * Input interrupt completion handler.
236 */
237
238 static void hid_irq_in(struct urb *urb)
239 {
240 struct hid_device *hid = urb->context;
241 struct usbhid_device *usbhid = hid->driver_data;
242 int status;
243
244 switch (urb->status) {
245 case 0: /* success */
246 usbhid_mark_busy(usbhid);
247 usbhid->retry_delay = 0;
248 hid_input_report(urb->context, HID_INPUT_REPORT,
249 urb->transfer_buffer,
250 urb->actual_length, 1);
251 /*
252 * autosuspend refused while keys are pressed
253 * because most keyboards don't wake up when
254 * a key is released
255 */
256 if (hid_check_keys_pressed(hid))
257 set_bit(HID_KEYS_PRESSED, &usbhid->iofl);
258 else
259 clear_bit(HID_KEYS_PRESSED, &usbhid->iofl);
260 break;
261 case -EPIPE: /* stall */
262 usbhid_mark_busy(usbhid);
263 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
264 set_bit(HID_CLEAR_HALT, &usbhid->iofl);
265 schedule_work(&usbhid->reset_work);
266 return;
267 case -ECONNRESET: /* unlink */
268 case -ENOENT:
269 case -ESHUTDOWN: /* unplug */
270 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
271 return;
272 case -EILSEQ: /* protocol error or unplug */
273 case -EPROTO: /* protocol error or unplug */
274 case -ETIME: /* protocol error or unplug */
275 case -ETIMEDOUT: /* Should never happen, but... */
276 usbhid_mark_busy(usbhid);
277 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
278 hid_io_error(hid);
279 return;
280 default: /* error */
281 dev_warn(&urb->dev->dev, "input irq status %d "
282 "received\n", urb->status);
283 }
284
285 status = usb_submit_urb(urb, GFP_ATOMIC);
286 if (status) {
287 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
288 if (status != -EPERM) {
289 err_hid("can't resubmit intr, %s-%s/input%d, status %d",
290 hid_to_usb_dev(hid)->bus->bus_name,
291 hid_to_usb_dev(hid)->devpath,
292 usbhid->ifnum, status);
293 hid_io_error(hid);
294 }
295 }
296 }
297
298 static int hid_submit_out(struct hid_device *hid)
299 {
300 struct hid_report *report;
301 char *raw_report;
302 struct usbhid_device *usbhid = hid->driver_data;
303
304 report = usbhid->out[usbhid->outtail].report;
305 raw_report = usbhid->out[usbhid->outtail].raw_report;
306
307 if (!test_bit(HID_REPORTED_IDLE, &usbhid->iofl)) {
308 usbhid->urbout->transfer_buffer_length = ((report->size - 1) >> 3) + 1 + (report->id > 0);
309 usbhid->urbout->dev = hid_to_usb_dev(hid);
310 memcpy(usbhid->outbuf, raw_report, usbhid->urbout->transfer_buffer_length);
311 kfree(raw_report);
312
313 dbg_hid("submitting out urb\n");
314
315 if (usb_submit_urb(usbhid->urbout, GFP_ATOMIC)) {
316 err_hid("usb_submit_urb(out) failed");
317 return -1;
318 }
319 usbhid->last_out = jiffies;
320 } else {
321 /*
322 * queue work to wake up the device.
323 * as the work queue is freezeable, this is safe
324 * with respect to STD and STR
325 */
326 queue_work(resumption_waker, &usbhid->restart_work);
327 }
328
329 return 0;
330 }
331
332 static int hid_submit_ctrl(struct hid_device *hid)
333 {
334 struct hid_report *report;
335 unsigned char dir;
336 char *raw_report;
337 int len;
338 struct usbhid_device *usbhid = hid->driver_data;
339
340 report = usbhid->ctrl[usbhid->ctrltail].report;
341 raw_report = usbhid->ctrl[usbhid->ctrltail].raw_report;
342 dir = usbhid->ctrl[usbhid->ctrltail].dir;
343
344 if (!test_bit(HID_REPORTED_IDLE, &usbhid->iofl)) {
345 len = ((report->size - 1) >> 3) + 1 + (report->id > 0);
346 if (dir == USB_DIR_OUT) {
347 usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);
348 usbhid->urbctrl->transfer_buffer_length = len;
349 memcpy(usbhid->ctrlbuf, raw_report, len);
350 kfree(raw_report);
351 } else {
352 int maxpacket, padlen;
353
354 usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0);
355 maxpacket = usb_maxpacket(hid_to_usb_dev(hid), usbhid->urbctrl->pipe, 0);
356 if (maxpacket > 0) {
357 padlen = DIV_ROUND_UP(len, maxpacket);
358 padlen *= maxpacket;
359 if (padlen > usbhid->bufsize)
360 padlen = usbhid->bufsize;
361 } else
362 padlen = 0;
363 usbhid->urbctrl->transfer_buffer_length = padlen;
364 }
365 usbhid->urbctrl->dev = hid_to_usb_dev(hid);
366
367 usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir;
368 usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT : HID_REQ_GET_REPORT;
369 usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) | report->id);
370 usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum);
371 usbhid->cr->wLength = cpu_to_le16(len);
372
373 dbg_hid("submitting ctrl urb: %s wValue=0x%04x wIndex=0x%04x wLength=%u\n",
374 usbhid->cr->bRequest == HID_REQ_SET_REPORT ? "Set_Report" : "Get_Report",
375 usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength);
376
377 if (usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC)) {
378 err_hid("usb_submit_urb(ctrl) failed");
379 return -1;
380 }
381 usbhid->last_ctrl = jiffies;
382 } else {
383 /*
384 * queue work to wake up the device.
385 * as the work queue is freezeable, this is safe
386 * with respect to STD and STR
387 */
388 queue_work(resumption_waker, &usbhid->restart_work);
389 }
390
391 return 0;
392 }
393
394 /*
395 * Output interrupt completion handler.
396 */
397
398 static void hid_irq_out(struct urb *urb)
399 {
400 struct hid_device *hid = urb->context;
401 struct usbhid_device *usbhid = hid->driver_data;
402 unsigned long flags;
403 int unplug = 0;
404
405 switch (urb->status) {
406 case 0: /* success */
407 break;
408 case -ESHUTDOWN: /* unplug */
409 unplug = 1;
410 case -EILSEQ: /* protocol error or unplug */
411 case -EPROTO: /* protocol error or unplug */
412 case -ECONNRESET: /* unlink */
413 case -ENOENT:
414 break;
415 default: /* error */
416 dev_warn(&urb->dev->dev, "output irq status %d "
417 "received\n", urb->status);
418 }
419
420 spin_lock_irqsave(&usbhid->lock, flags);
421
422 if (unplug)
423 usbhid->outtail = usbhid->outhead;
424 else
425 usbhid->outtail = (usbhid->outtail + 1) & (HID_OUTPUT_FIFO_SIZE - 1);
426
427 if (usbhid->outhead != usbhid->outtail) {
428 if (hid_submit_out(hid)) {
429 clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
430 wake_up(&usbhid->wait);
431 }
432 spin_unlock_irqrestore(&usbhid->lock, flags);
433 return;
434 }
435
436 clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
437 spin_unlock_irqrestore(&usbhid->lock, flags);
438 wake_up(&usbhid->wait);
439 }
440
441 /*
442 * Control pipe completion handler.
443 */
444
445 static void hid_ctrl(struct urb *urb)
446 {
447 struct hid_device *hid = urb->context;
448 struct usbhid_device *usbhid = hid->driver_data;
449 int unplug = 0, status = urb->status;
450
451 spin_lock(&usbhid->lock);
452
453 switch (status) {
454 case 0: /* success */
455 if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_IN)
456 hid_input_report(urb->context,
457 usbhid->ctrl[usbhid->ctrltail].report->type,
458 urb->transfer_buffer, urb->actual_length, 0);
459 break;
460 case -ESHUTDOWN: /* unplug */
461 unplug = 1;
462 case -EILSEQ: /* protocol error or unplug */
463 case -EPROTO: /* protocol error or unplug */
464 case -ECONNRESET: /* unlink */
465 case -ENOENT:
466 case -EPIPE: /* report not available */
467 break;
468 default: /* error */
469 dev_warn(&urb->dev->dev, "ctrl urb status %d "
470 "received\n", status);
471 }
472
473 if (unplug)
474 usbhid->ctrltail = usbhid->ctrlhead;
475 else
476 usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1);
477
478 if (usbhid->ctrlhead != usbhid->ctrltail) {
479 if (hid_submit_ctrl(hid)) {
480 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
481 wake_up(&usbhid->wait);
482 }
483 spin_unlock(&usbhid->lock);
484 return;
485 }
486
487 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
488 spin_unlock(&usbhid->lock);
489 wake_up(&usbhid->wait);
490 }
491
492 static void __usbhid_submit_report(struct hid_device *hid, struct hid_report *report,
493 unsigned char dir)
494 {
495 int head;
496 struct usbhid_device *usbhid = hid->driver_data;
497 int len = ((report->size - 1) >> 3) + 1 + (report->id > 0);
498
499 if ((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN)
500 return;
501
502 if (usbhid->urbout && dir == USB_DIR_OUT && report->type == HID_OUTPUT_REPORT) {
503 if ((head = (usbhid->outhead + 1) & (HID_OUTPUT_FIFO_SIZE - 1)) == usbhid->outtail) {
504 dev_warn(&hid->dev, "output queue full\n");
505 return;
506 }
507
508 usbhid->out[usbhid->outhead].raw_report = kmalloc(len, GFP_ATOMIC);
509 if (!usbhid->out[usbhid->outhead].raw_report) {
510 dev_warn(&hid->dev, "output queueing failed\n");
511 return;
512 }
513 hid_output_report(report, usbhid->out[usbhid->outhead].raw_report);
514 usbhid->out[usbhid->outhead].report = report;
515 usbhid->outhead = head;
516
517 if (!test_and_set_bit(HID_OUT_RUNNING, &usbhid->iofl)) {
518 if (hid_submit_out(hid))
519 clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
520 } else {
521 /*
522 * the queue is known to run
523 * but an earlier request may be stuck
524 * we may need to time out
525 * no race because this is called under
526 * spinlock
527 */
528 if (time_after(jiffies, usbhid->last_out + HZ * 5))
529 usb_unlink_urb(usbhid->urbout);
530 }
531 return;
532 }
533
534 if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) {
535 dev_warn(&hid->dev, "control queue full\n");
536 return;
537 }
538
539 if (dir == USB_DIR_OUT) {
540 usbhid->ctrl[usbhid->ctrlhead].raw_report = kmalloc(len, GFP_ATOMIC);
541 if (!usbhid->ctrl[usbhid->ctrlhead].raw_report) {
542 dev_warn(&hid->dev, "control queueing failed\n");
543 return;
544 }
545 hid_output_report(report, usbhid->ctrl[usbhid->ctrlhead].raw_report);
546 }
547 usbhid->ctrl[usbhid->ctrlhead].report = report;
548 usbhid->ctrl[usbhid->ctrlhead].dir = dir;
549 usbhid->ctrlhead = head;
550
551 if (!test_and_set_bit(HID_CTRL_RUNNING, &usbhid->iofl)) {
552 if (hid_submit_ctrl(hid))
553 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
554 } else {
555 /*
556 * the queue is known to run
557 * but an earlier request may be stuck
558 * we may need to time out
559 * no race because this is called under
560 * spinlock
561 */
562 if (time_after(jiffies, usbhid->last_ctrl + HZ * 5))
563 usb_unlink_urb(usbhid->urbctrl);
564 }
565 }
566
567 void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
568 {
569 struct usbhid_device *usbhid = hid->driver_data;
570 unsigned long flags;
571
572 spin_lock_irqsave(&usbhid->lock, flags);
573 __usbhid_submit_report(hid, report, dir);
574 spin_unlock_irqrestore(&usbhid->lock, flags);
575 }
576 EXPORT_SYMBOL_GPL(usbhid_submit_report);
577
578 static int usb_hidinput_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
579 {
580 struct hid_device *hid = input_get_drvdata(dev);
581 struct usbhid_device *usbhid = hid->driver_data;
582 struct hid_field *field;
583 unsigned long flags;
584 int offset;
585
586 if (type == EV_FF)
587 return input_ff_event(dev, type, code, value);
588
589 if (type != EV_LED)
590 return -1;
591
592 if ((offset = hidinput_find_field(hid, type, code, &field)) == -1) {
593 dev_warn(&dev->dev, "event field not found\n");
594 return -1;
595 }
596
597 hid_set_field(field, offset, value);
598 if (value) {
599 spin_lock_irqsave(&usbhid->lock, flags);
600 usbhid->ledcount++;
601 spin_unlock_irqrestore(&usbhid->lock, flags);
602 } else {
603 spin_lock_irqsave(&usbhid->lock, flags);
604 usbhid->ledcount--;
605 spin_unlock_irqrestore(&usbhid->lock, flags);
606 }
607 usbhid_submit_report(hid, field->report, USB_DIR_OUT);
608
609 return 0;
610 }
611
612 int usbhid_wait_io(struct hid_device *hid)
613 {
614 struct usbhid_device *usbhid = hid->driver_data;
615
616 if (!wait_event_timeout(usbhid->wait,
617 (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl) &&
618 !test_bit(HID_OUT_RUNNING, &usbhid->iofl)),
619 10*HZ)) {
620 dbg_hid("timeout waiting for ctrl or out queue to clear\n");
621 return -1;
622 }
623
624 return 0;
625 }
626 EXPORT_SYMBOL_GPL(usbhid_wait_io);
627
628 static int hid_set_idle(struct usb_device *dev, int ifnum, int report, int idle)
629 {
630 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
631 HID_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE, (idle << 8) | report,
632 ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT);
633 }
634
635 static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
636 unsigned char type, void *buf, int size)
637 {
638 int result, retries = 4;
639
640 memset(buf, 0, size);
641
642 do {
643 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
644 USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
645 (type << 8), ifnum, buf, size, USB_CTRL_GET_TIMEOUT);
646 retries--;
647 } while (result < size && retries);
648 return result;
649 }
650
651 int usbhid_open(struct hid_device *hid)
652 {
653 struct usbhid_device *usbhid = hid->driver_data;
654 int res;
655
656 mutex_lock(&hid_open_mut);
657 if (!hid->open++) {
658 res = usb_autopm_get_interface(usbhid->intf);
659 /* the device must be awake to reliable request remote wakeup */
660 if (res < 0) {
661 hid->open--;
662 mutex_unlock(&hid_open_mut);
663 return -EIO;
664 }
665 usbhid->intf->needs_remote_wakeup = 1;
666 if (hid_start_in(hid))
667 hid_io_error(hid);
668
669 usb_autopm_put_interface(usbhid->intf);
670 }
671 mutex_unlock(&hid_open_mut);
672 return 0;
673 }
674
675 void usbhid_close(struct hid_device *hid)
676 {
677 struct usbhid_device *usbhid = hid->driver_data;
678
679 mutex_lock(&hid_open_mut);
680
681 /* protecting hid->open to make sure we don't restart
682 * data acquistion due to a resumption we no longer
683 * care about
684 */
685 spin_lock_irq(&usbhid->lock);
686 if (!--hid->open) {
687 spin_unlock_irq(&usbhid->lock);
688 hid_cancel_delayed_stuff(usbhid);
689 usb_kill_urb(usbhid->urbin);
690 usbhid->intf->needs_remote_wakeup = 0;
691 } else {
692 spin_unlock_irq(&usbhid->lock);
693 }
694 mutex_unlock(&hid_open_mut);
695 }
696
697 /*
698 * Initialize all reports
699 */
700
701 void usbhid_init_reports(struct hid_device *hid)
702 {
703 struct hid_report *report;
704 struct usbhid_device *usbhid = hid->driver_data;
705 int err, ret;
706
707 list_for_each_entry(report, &hid->report_enum[HID_INPUT_REPORT].report_list, list)
708 usbhid_submit_report(hid, report, USB_DIR_IN);
709
710 list_for_each_entry(report, &hid->report_enum[HID_FEATURE_REPORT].report_list, list)
711 usbhid_submit_report(hid, report, USB_DIR_IN);
712
713 err = 0;
714 ret = usbhid_wait_io(hid);
715 while (ret) {
716 err |= ret;
717 if (test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
718 usb_kill_urb(usbhid->urbctrl);
719 if (test_bit(HID_OUT_RUNNING, &usbhid->iofl))
720 usb_kill_urb(usbhid->urbout);
721 ret = usbhid_wait_io(hid);
722 }
723
724 if (err)
725 dev_warn(&hid->dev, "timeout initializing reports\n");
726 }
727
728 /*
729 * Reset LEDs which BIOS might have left on. For now, just NumLock (0x01).
730 */
731 static int hid_find_field_early(struct hid_device *hid, unsigned int page,
732 unsigned int hid_code, struct hid_field **pfield)
733 {
734 struct hid_report *report;
735 struct hid_field *field;
736 struct hid_usage *usage;
737 int i, j;
738
739 list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) {
740 for (i = 0; i < report->maxfield; i++) {
741 field = report->field[i];
742 for (j = 0; j < field->maxusage; j++) {
743 usage = &field->usage[j];
744 if ((usage->hid & HID_USAGE_PAGE) == page &&
745 (usage->hid & 0xFFFF) == hid_code) {
746 *pfield = field;
747 return j;
748 }
749 }
750 }
751 }
752 return -1;
753 }
754
755 void usbhid_set_leds(struct hid_device *hid)
756 {
757 struct hid_field *field;
758 int offset;
759
760 if ((offset = hid_find_field_early(hid, HID_UP_LED, 0x01, &field)) != -1) {
761 hid_set_field(field, offset, 0);
762 usbhid_submit_report(hid, field->report, USB_DIR_OUT);
763 }
764 }
765 EXPORT_SYMBOL_GPL(usbhid_set_leds);
766
767 /*
768 * Traverse the supplied list of reports and find the longest
769 */
770 static void hid_find_max_report(struct hid_device *hid, unsigned int type,
771 unsigned int *max)
772 {
773 struct hid_report *report;
774 unsigned int size;
775
776 list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
777 size = ((report->size - 1) >> 3) + 1 + hid->report_enum[type].numbered;
778 if (*max < size)
779 *max = size;
780 }
781 }
782
783 static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid)
784 {
785 struct usbhid_device *usbhid = hid->driver_data;
786
787 usbhid->inbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
788 &usbhid->inbuf_dma);
789 usbhid->outbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
790 &usbhid->outbuf_dma);
791 usbhid->cr = kmalloc(sizeof(*usbhid->cr), GFP_KERNEL);
792 usbhid->ctrlbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
793 &usbhid->ctrlbuf_dma);
794 if (!usbhid->inbuf || !usbhid->outbuf || !usbhid->cr ||
795 !usbhid->ctrlbuf)
796 return -1;
797
798 return 0;
799 }
800
801 static int usbhid_output_raw_report(struct hid_device *hid, __u8 *buf, size_t count,
802 unsigned char report_type)
803 {
804 struct usbhid_device *usbhid = hid->driver_data;
805 struct usb_device *dev = hid_to_usb_dev(hid);
806 struct usb_interface *intf = usbhid->intf;
807 struct usb_host_interface *interface = intf->cur_altsetting;
808 int ret;
809
810 if (usbhid->urbout && report_type != HID_FEATURE_REPORT) {
811 int actual_length;
812 int skipped_report_id = 0;
813
814 if (buf[0] == 0x0) {
815 /* Don't send the Report ID */
816 buf++;
817 count--;
818 skipped_report_id = 1;
819 }
820 ret = usb_interrupt_msg(dev, usbhid->urbout->pipe,
821 buf, count, &actual_length,
822 USB_CTRL_SET_TIMEOUT);
823 /* return the number of bytes transferred */
824 if (ret == 0) {
825 ret = actual_length;
826 /* count also the report id */
827 if (skipped_report_id)
828 ret++;
829 }
830 } else {
831 int skipped_report_id = 0;
832 int report_id = buf[0];
833 if (buf[0] == 0x0) {
834 /* Don't send the Report ID */
835 buf++;
836 count--;
837 skipped_report_id = 1;
838 }
839 ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
840 HID_REQ_SET_REPORT,
841 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
842 ((report_type + 1) << 8) | report_id,
843 interface->desc.bInterfaceNumber, buf, count,
844 USB_CTRL_SET_TIMEOUT);
845 /* count also the report id, if this was a numbered report. */
846 if (ret > 0 && skipped_report_id)
847 ret++;
848 }
849
850 return ret;
851 }
852
853 static void usbhid_restart_queues(struct usbhid_device *usbhid)
854 {
855 if (usbhid->urbout)
856 usbhid_restart_out_queue(usbhid);
857 usbhid_restart_ctrl_queue(usbhid);
858 }
859
860 static void __usbhid_restart_queues(struct work_struct *work)
861 {
862 struct usbhid_device *usbhid =
863 container_of(work, struct usbhid_device, restart_work);
864 int r;
865
866 r = usb_autopm_get_interface(usbhid->intf);
867 if (r < 0)
868 return;
869 usb_autopm_put_interface(usbhid->intf);
870 }
871
872 static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid)
873 {
874 struct usbhid_device *usbhid = hid->driver_data;
875
876 usb_free_coherent(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma);
877 usb_free_coherent(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma);
878 kfree(usbhid->cr);
879 usb_free_coherent(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma);
880 }
881
882 static int usbhid_parse(struct hid_device *hid)
883 {
884 struct usb_interface *intf = to_usb_interface(hid->dev.parent);
885 struct usb_host_interface *interface = intf->cur_altsetting;
886 struct usb_device *dev = interface_to_usbdev (intf);
887 struct hid_descriptor *hdesc;
888 u32 quirks = 0;
889 unsigned int rsize = 0;
890 char *rdesc;
891 int ret, n;
892
893 quirks = usbhid_lookup_quirk(le16_to_cpu(dev->descriptor.idVendor),
894 le16_to_cpu(dev->descriptor.idProduct));
895
896 if (quirks & HID_QUIRK_IGNORE)
897 return -ENODEV;
898
899 /* Many keyboards and mice don't like to be polled for reports,
900 * so we will always set the HID_QUIRK_NOGET flag for them. */
901 if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) {
902 if (interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_KEYBOARD ||
903 interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE)
904 quirks |= HID_QUIRK_NOGET;
905 }
906
907 if (usb_get_extra_descriptor(interface, HID_DT_HID, &hdesc) &&
908 (!interface->desc.bNumEndpoints ||
909 usb_get_extra_descriptor(&interface->endpoint[0], HID_DT_HID, &hdesc))) {
910 dbg_hid("class descriptor not present\n");
911 return -ENODEV;
912 }
913
914 hid->version = le16_to_cpu(hdesc->bcdHID);
915 hid->country = hdesc->bCountryCode;
916
917 for (n = 0; n < hdesc->bNumDescriptors; n++)
918 if (hdesc->desc[n].bDescriptorType == HID_DT_REPORT)
919 rsize = le16_to_cpu(hdesc->desc[n].wDescriptorLength);
920
921 if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
922 dbg_hid("weird size of report descriptor (%u)\n", rsize);
923 return -EINVAL;
924 }
925
926 if (!(rdesc = kmalloc(rsize, GFP_KERNEL))) {
927 dbg_hid("couldn't allocate rdesc memory\n");
928 return -ENOMEM;
929 }
930
931 hid_set_idle(dev, interface->desc.bInterfaceNumber, 0, 0);
932
933 ret = hid_get_class_descriptor(dev, interface->desc.bInterfaceNumber,
934 HID_DT_REPORT, rdesc, rsize);
935 if (ret < 0) {
936 dbg_hid("reading report descriptor failed\n");
937 kfree(rdesc);
938 goto err;
939 }
940
941 ret = hid_parse_report(hid, rdesc, rsize);
942 kfree(rdesc);
943 if (ret) {
944 dbg_hid("parsing report descriptor failed\n");
945 goto err;
946 }
947
948 hid->quirks |= quirks;
949
950 return 0;
951 err:
952 return ret;
953 }
954
955 static int usbhid_start(struct hid_device *hid)
956 {
957 struct usb_interface *intf = to_usb_interface(hid->dev.parent);
958 struct usb_host_interface *interface = intf->cur_altsetting;
959 struct usb_device *dev = interface_to_usbdev(intf);
960 struct usbhid_device *usbhid = hid->driver_data;
961 unsigned int n, insize = 0;
962 int ret;
963
964 clear_bit(HID_DISCONNECTED, &usbhid->iofl);
965
966 usbhid->bufsize = HID_MIN_BUFFER_SIZE;
967 hid_find_max_report(hid, HID_INPUT_REPORT, &usbhid->bufsize);
968 hid_find_max_report(hid, HID_OUTPUT_REPORT, &usbhid->bufsize);
969 hid_find_max_report(hid, HID_FEATURE_REPORT, &usbhid->bufsize);
970
971 if (usbhid->bufsize > HID_MAX_BUFFER_SIZE)
972 usbhid->bufsize = HID_MAX_BUFFER_SIZE;
973
974 hid_find_max_report(hid, HID_INPUT_REPORT, &insize);
975
976 if (insize > HID_MAX_BUFFER_SIZE)
977 insize = HID_MAX_BUFFER_SIZE;
978
979 if (hid_alloc_buffers(dev, hid)) {
980 ret = -ENOMEM;
981 goto fail;
982 }
983
984 for (n = 0; n < interface->desc.bNumEndpoints; n++) {
985 struct usb_endpoint_descriptor *endpoint;
986 int pipe;
987 int interval;
988
989 endpoint = &interface->endpoint[n].desc;
990 if (!usb_endpoint_xfer_int(endpoint))
991 continue;
992
993 interval = endpoint->bInterval;
994
995 /* Some vendors give fullspeed interval on highspeed devides */
996 if (hid->quirks & HID_QUIRK_FULLSPEED_INTERVAL &&
997 dev->speed == USB_SPEED_HIGH) {
998 interval = fls(endpoint->bInterval*8);
999 printk(KERN_INFO "%s: Fixing fullspeed to highspeed interval: %d -> %d\n",
1000 hid->name, endpoint->bInterval, interval);
1001 }
1002
1003 /* Change the polling interval of mice. */
1004 if (hid->collection->usage == HID_GD_MOUSE && hid_mousepoll_interval > 0)
1005 interval = hid_mousepoll_interval;
1006
1007 ret = -ENOMEM;
1008 if (usb_endpoint_dir_in(endpoint)) {
1009 if (usbhid->urbin)
1010 continue;
1011 if (!(usbhid->urbin = usb_alloc_urb(0, GFP_KERNEL)))
1012 goto fail;
1013 pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
1014 usb_fill_int_urb(usbhid->urbin, dev, pipe, usbhid->inbuf, insize,
1015 hid_irq_in, hid, interval);
1016 usbhid->urbin->transfer_dma = usbhid->inbuf_dma;
1017 usbhid->urbin->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1018 } else {
1019 if (usbhid->urbout)
1020 continue;
1021 if (!(usbhid->urbout = usb_alloc_urb(0, GFP_KERNEL)))
1022 goto fail;
1023 pipe = usb_sndintpipe(dev, endpoint->bEndpointAddress);
1024 usb_fill_int_urb(usbhid->urbout, dev, pipe, usbhid->outbuf, 0,
1025 hid_irq_out, hid, interval);
1026 usbhid->urbout->transfer_dma = usbhid->outbuf_dma;
1027 usbhid->urbout->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1028 }
1029 }
1030
1031 usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL);
1032 if (!usbhid->urbctrl) {
1033 ret = -ENOMEM;
1034 goto fail;
1035 }
1036
1037 usb_fill_control_urb(usbhid->urbctrl, dev, 0, (void *) usbhid->cr,
1038 usbhid->ctrlbuf, 1, hid_ctrl, hid);
1039 usbhid->urbctrl->transfer_dma = usbhid->ctrlbuf_dma;
1040 usbhid->urbctrl->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1041
1042 if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS))
1043 usbhid_init_reports(hid);
1044
1045 set_bit(HID_STARTED, &usbhid->iofl);
1046
1047 /* Some keyboards don't work until their LEDs have been set.
1048 * Since BIOSes do set the LEDs, it must be safe for any device
1049 * that supports the keyboard boot protocol.
1050 * In addition, enable remote wakeup by default for all keyboard
1051 * devices supporting the boot protocol.
1052 */
1053 if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT &&
1054 interface->desc.bInterfaceProtocol ==
1055 USB_INTERFACE_PROTOCOL_KEYBOARD) {
1056 usbhid_set_leds(hid);
1057 device_set_wakeup_enable(&dev->dev, 1);
1058 }
1059 return 0;
1060
1061 fail:
1062 usb_free_urb(usbhid->urbin);
1063 usb_free_urb(usbhid->urbout);
1064 usb_free_urb(usbhid->urbctrl);
1065 usbhid->urbin = NULL;
1066 usbhid->urbout = NULL;
1067 usbhid->urbctrl = NULL;
1068 hid_free_buffers(dev, hid);
1069 return ret;
1070 }
1071
1072 static void usbhid_stop(struct hid_device *hid)
1073 {
1074 struct usbhid_device *usbhid = hid->driver_data;
1075
1076 if (WARN_ON(!usbhid))
1077 return;
1078
1079 clear_bit(HID_STARTED, &usbhid->iofl);
1080 spin_lock_irq(&usbhid->lock); /* Sync with error handler */
1081 set_bit(HID_DISCONNECTED, &usbhid->iofl);
1082 spin_unlock_irq(&usbhid->lock);
1083 usb_kill_urb(usbhid->urbin);
1084 usb_kill_urb(usbhid->urbout);
1085 usb_kill_urb(usbhid->urbctrl);
1086
1087 hid_cancel_delayed_stuff(usbhid);
1088
1089 hid->claimed = 0;
1090
1091 usb_free_urb(usbhid->urbin);
1092 usb_free_urb(usbhid->urbctrl);
1093 usb_free_urb(usbhid->urbout);
1094 usbhid->urbin = NULL; /* don't mess up next start */
1095 usbhid->urbctrl = NULL;
1096 usbhid->urbout = NULL;
1097
1098 hid_free_buffers(hid_to_usb_dev(hid), hid);
1099 }
1100
1101 static int usbhid_power(struct hid_device *hid, int lvl)
1102 {
1103 int r = 0;
1104
1105 switch (lvl) {
1106 case PM_HINT_FULLON:
1107 r = usbhid_get_power(hid);
1108 break;
1109 case PM_HINT_NORMAL:
1110 usbhid_put_power(hid);
1111 break;
1112 }
1113 return r;
1114 }
1115
1116 static struct hid_ll_driver usb_hid_driver = {
1117 .parse = usbhid_parse,
1118 .start = usbhid_start,
1119 .stop = usbhid_stop,
1120 .open = usbhid_open,
1121 .close = usbhid_close,
1122 .power = usbhid_power,
1123 .hidinput_input_event = usb_hidinput_input_event,
1124 };
1125
1126 static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *id)
1127 {
1128 struct usb_host_interface *interface = intf->cur_altsetting;
1129 struct usb_device *dev = interface_to_usbdev(intf);
1130 struct usbhid_device *usbhid;
1131 struct hid_device *hid;
1132 unsigned int n, has_in = 0;
1133 size_t len;
1134 int ret;
1135
1136 dbg_hid("HID probe called for ifnum %d\n",
1137 intf->altsetting->desc.bInterfaceNumber);
1138
1139 for (n = 0; n < interface->desc.bNumEndpoints; n++)
1140 if (usb_endpoint_is_int_in(&interface->endpoint[n].desc))
1141 has_in++;
1142 if (!has_in) {
1143 dev_err(&intf->dev, "couldn't find an input interrupt "
1144 "endpoint\n");
1145 return -ENODEV;
1146 }
1147
1148 hid = hid_allocate_device();
1149 if (IS_ERR(hid))
1150 return PTR_ERR(hid);
1151
1152 usb_set_intfdata(intf, hid);
1153 hid->ll_driver = &usb_hid_driver;
1154 hid->hid_output_raw_report = usbhid_output_raw_report;
1155 hid->ff_init = hid_pidff_init;
1156 #ifdef CONFIG_USB_HIDDEV
1157 hid->hiddev_connect = hiddev_connect;
1158 hid->hiddev_disconnect = hiddev_disconnect;
1159 hid->hiddev_hid_event = hiddev_hid_event;
1160 hid->hiddev_report_event = hiddev_report_event;
1161 #endif
1162 hid->dev.parent = &intf->dev;
1163 hid->bus = BUS_USB;
1164 hid->vendor = le16_to_cpu(dev->descriptor.idVendor);
1165 hid->product = le16_to_cpu(dev->descriptor.idProduct);
1166 hid->name[0] = 0;
1167 hid->quirks = usbhid_lookup_quirk(hid->vendor, hid->product);
1168 if (intf->cur_altsetting->desc.bInterfaceProtocol ==
1169 USB_INTERFACE_PROTOCOL_MOUSE)
1170 hid->type = HID_TYPE_USBMOUSE;
1171
1172 if (dev->manufacturer)
1173 strlcpy(hid->name, dev->manufacturer, sizeof(hid->name));
1174
1175 if (dev->product) {
1176 if (dev->manufacturer)
1177 strlcat(hid->name, " ", sizeof(hid->name));
1178 strlcat(hid->name, dev->product, sizeof(hid->name));
1179 }
1180
1181 if (!strlen(hid->name))
1182 snprintf(hid->name, sizeof(hid->name), "HID %04x:%04x",
1183 le16_to_cpu(dev->descriptor.idVendor),
1184 le16_to_cpu(dev->descriptor.idProduct));
1185
1186 usb_make_path(dev, hid->phys, sizeof(hid->phys));
1187 strlcat(hid->phys, "/input", sizeof(hid->phys));
1188 len = strlen(hid->phys);
1189 if (len < sizeof(hid->phys) - 1)
1190 snprintf(hid->phys + len, sizeof(hid->phys) - len,
1191 "%d", intf->altsetting[0].desc.bInterfaceNumber);
1192
1193 if (usb_string(dev, dev->descriptor.iSerialNumber, hid->uniq, 64) <= 0)
1194 hid->uniq[0] = 0;
1195
1196 usbhid = kzalloc(sizeof(*usbhid), GFP_KERNEL);
1197 if (usbhid == NULL) {
1198 ret = -ENOMEM;
1199 goto err;
1200 }
1201
1202 hid->driver_data = usbhid;
1203 usbhid->hid = hid;
1204 usbhid->intf = intf;
1205 usbhid->ifnum = interface->desc.bInterfaceNumber;
1206
1207 init_waitqueue_head(&usbhid->wait);
1208 INIT_WORK(&usbhid->reset_work, hid_reset);
1209 INIT_WORK(&usbhid->restart_work, __usbhid_restart_queues);
1210 setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);
1211 spin_lock_init(&usbhid->lock);
1212
1213 ret = hid_add_device(hid);
1214 if (ret) {
1215 if (ret != -ENODEV)
1216 dev_err(&intf->dev, "can't add hid device: %d\n", ret);
1217 goto err_free;
1218 }
1219
1220 return 0;
1221 err_free:
1222 kfree(usbhid);
1223 err:
1224 hid_destroy_device(hid);
1225 return ret;
1226 }
1227
1228 static void usbhid_disconnect(struct usb_interface *intf)
1229 {
1230 struct hid_device *hid = usb_get_intfdata(intf);
1231 struct usbhid_device *usbhid;
1232
1233 if (WARN_ON(!hid))
1234 return;
1235
1236 usbhid = hid->driver_data;
1237 hid_destroy_device(hid);
1238 kfree(usbhid);
1239 }
1240
1241 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid)
1242 {
1243 del_timer_sync(&usbhid->io_retry);
1244 cancel_work_sync(&usbhid->restart_work);
1245 cancel_work_sync(&usbhid->reset_work);
1246 }
1247
1248 static void hid_cease_io(struct usbhid_device *usbhid)
1249 {
1250 del_timer(&usbhid->io_retry);
1251 usb_kill_urb(usbhid->urbin);
1252 usb_kill_urb(usbhid->urbctrl);
1253 usb_kill_urb(usbhid->urbout);
1254 }
1255
1256 /* Treat USB reset pretty much the same as suspend/resume */
1257 static int hid_pre_reset(struct usb_interface *intf)
1258 {
1259 struct hid_device *hid = usb_get_intfdata(intf);
1260 struct usbhid_device *usbhid = hid->driver_data;
1261
1262 spin_lock_irq(&usbhid->lock);
1263 set_bit(HID_RESET_PENDING, &usbhid->iofl);
1264 spin_unlock_irq(&usbhid->lock);
1265 cancel_work_sync(&usbhid->restart_work);
1266 hid_cease_io(usbhid);
1267
1268 return 0;
1269 }
1270
1271 /* Same routine used for post_reset and reset_resume */
1272 static int hid_post_reset(struct usb_interface *intf)
1273 {
1274 struct usb_device *dev = interface_to_usbdev (intf);
1275 struct hid_device *hid = usb_get_intfdata(intf);
1276 struct usbhid_device *usbhid = hid->driver_data;
1277 int status;
1278
1279 spin_lock_irq(&usbhid->lock);
1280 clear_bit(HID_RESET_PENDING, &usbhid->iofl);
1281 spin_unlock_irq(&usbhid->lock);
1282 hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0);
1283 status = hid_start_in(hid);
1284 if (status < 0)
1285 hid_io_error(hid);
1286 usbhid_restart_queues(usbhid);
1287
1288 return 0;
1289 }
1290
1291 int usbhid_get_power(struct hid_device *hid)
1292 {
1293 struct usbhid_device *usbhid = hid->driver_data;
1294
1295 return usb_autopm_get_interface(usbhid->intf);
1296 }
1297
1298 void usbhid_put_power(struct hid_device *hid)
1299 {
1300 struct usbhid_device *usbhid = hid->driver_data;
1301
1302 usb_autopm_put_interface(usbhid->intf);
1303 }
1304
1305
1306 #ifdef CONFIG_PM
1307 static int hid_suspend(struct usb_interface *intf, pm_message_t message)
1308 {
1309 struct hid_device *hid = usb_get_intfdata(intf);
1310 struct usbhid_device *usbhid = hid->driver_data;
1311 int status;
1312
1313 if (message.event & PM_EVENT_AUTO) {
1314 spin_lock_irq(&usbhid->lock); /* Sync with error handler */
1315 if (!test_bit(HID_RESET_PENDING, &usbhid->iofl)
1316 && !test_bit(HID_CLEAR_HALT, &usbhid->iofl)
1317 && !test_bit(HID_OUT_RUNNING, &usbhid->iofl)
1318 && !test_bit(HID_CTRL_RUNNING, &usbhid->iofl)
1319 && !test_bit(HID_KEYS_PRESSED, &usbhid->iofl)
1320 && (!usbhid->ledcount || ignoreled))
1321 {
1322 set_bit(HID_REPORTED_IDLE, &usbhid->iofl);
1323 spin_unlock_irq(&usbhid->lock);
1324 if (hid->driver && hid->driver->suspend) {
1325 status = hid->driver->suspend(hid, message);
1326 if (status < 0)
1327 return status;
1328 }
1329 } else {
1330 usbhid_mark_busy(usbhid);
1331 spin_unlock_irq(&usbhid->lock);
1332 return -EBUSY;
1333 }
1334
1335 } else {
1336 if (hid->driver && hid->driver->suspend) {
1337 status = hid->driver->suspend(hid, message);
1338 if (status < 0)
1339 return status;
1340 }
1341 spin_lock_irq(&usbhid->lock);
1342 set_bit(HID_REPORTED_IDLE, &usbhid->iofl);
1343 spin_unlock_irq(&usbhid->lock);
1344 if (usbhid_wait_io(hid) < 0)
1345 return -EIO;
1346 }
1347
1348 if (!ignoreled && (message.event & PM_EVENT_AUTO)) {
1349 spin_lock_irq(&usbhid->lock);
1350 if (test_bit(HID_LED_ON, &usbhid->iofl)) {
1351 spin_unlock_irq(&usbhid->lock);
1352 usbhid_mark_busy(usbhid);
1353 return -EBUSY;
1354 }
1355 spin_unlock_irq(&usbhid->lock);
1356 }
1357
1358 hid_cancel_delayed_stuff(usbhid);
1359 hid_cease_io(usbhid);
1360
1361 if ((message.event & PM_EVENT_AUTO) &&
1362 test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) {
1363 /* lost race against keypresses */
1364 status = hid_start_in(hid);
1365 if (status < 0)
1366 hid_io_error(hid);
1367 usbhid_mark_busy(usbhid);
1368 return -EBUSY;
1369 }
1370 dev_dbg(&intf->dev, "suspend\n");
1371 return 0;
1372 }
1373
1374 static int hid_resume(struct usb_interface *intf)
1375 {
1376 struct hid_device *hid = usb_get_intfdata (intf);
1377 struct usbhid_device *usbhid = hid->driver_data;
1378 int status;
1379
1380 if (!test_bit(HID_STARTED, &usbhid->iofl))
1381 return 0;
1382
1383 clear_bit(HID_REPORTED_IDLE, &usbhid->iofl);
1384 usbhid_mark_busy(usbhid);
1385
1386 if (test_bit(HID_CLEAR_HALT, &usbhid->iofl) ||
1387 test_bit(HID_RESET_PENDING, &usbhid->iofl))
1388 schedule_work(&usbhid->reset_work);
1389 usbhid->retry_delay = 0;
1390 status = hid_start_in(hid);
1391 if (status < 0)
1392 hid_io_error(hid);
1393 usbhid_restart_queues(usbhid);
1394
1395 if (status >= 0 && hid->driver && hid->driver->resume) {
1396 int ret = hid->driver->resume(hid);
1397 if (ret < 0)
1398 status = ret;
1399 }
1400 dev_dbg(&intf->dev, "resume status %d\n", status);
1401 return 0;
1402 }
1403
1404 static int hid_reset_resume(struct usb_interface *intf)
1405 {
1406 struct hid_device *hid = usb_get_intfdata(intf);
1407 struct usbhid_device *usbhid = hid->driver_data;
1408 int status;
1409
1410 clear_bit(HID_REPORTED_IDLE, &usbhid->iofl);
1411 status = hid_post_reset(intf);
1412 if (status >= 0 && hid->driver && hid->driver->reset_resume) {
1413 int ret = hid->driver->reset_resume(hid);
1414 if (ret < 0)
1415 status = ret;
1416 }
1417 return status;
1418 }
1419
1420 #endif /* CONFIG_PM */
1421
1422 static const struct usb_device_id hid_usb_ids[] = {
1423 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
1424 .bInterfaceClass = USB_INTERFACE_CLASS_HID },
1425 { } /* Terminating entry */
1426 };
1427
1428 MODULE_DEVICE_TABLE (usb, hid_usb_ids);
1429
1430 static struct usb_driver hid_driver = {
1431 .name = "usbhid",
1432 .probe = usbhid_probe,
1433 .disconnect = usbhid_disconnect,
1434 #ifdef CONFIG_PM
1435 .suspend = hid_suspend,
1436 .resume = hid_resume,
1437 .reset_resume = hid_reset_resume,
1438 #endif
1439 .pre_reset = hid_pre_reset,
1440 .post_reset = hid_post_reset,
1441 .id_table = hid_usb_ids,
1442 .supports_autosuspend = 1,
1443 };
1444
1445 static const struct hid_device_id hid_usb_table[] = {
1446 { HID_USB_DEVICE(HID_ANY_ID, HID_ANY_ID) },
1447 { }
1448 };
1449
1450 struct usb_interface *usbhid_find_interface(int minor)
1451 {
1452 return usb_find_interface(&hid_driver, minor);
1453 }
1454
1455 static struct hid_driver hid_usb_driver = {
1456 .name = "generic-usb",
1457 .id_table = hid_usb_table,
1458 };
1459
1460 static int __init hid_init(void)
1461 {
1462 int retval = -ENOMEM;
1463
1464 resumption_waker = create_freezeable_workqueue("usbhid_resumer");
1465 if (!resumption_waker)
1466 goto no_queue;
1467 retval = hid_register_driver(&hid_usb_driver);
1468 if (retval)
1469 goto hid_register_fail;
1470 retval = usbhid_quirks_init(quirks_param);
1471 if (retval)
1472 goto usbhid_quirks_init_fail;
1473 retval = usb_register(&hid_driver);
1474 if (retval)
1475 goto usb_register_fail;
1476 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1477
1478 return 0;
1479 usb_register_fail:
1480 usbhid_quirks_exit();
1481 usbhid_quirks_init_fail:
1482 hid_unregister_driver(&hid_usb_driver);
1483 hid_register_fail:
1484 destroy_workqueue(resumption_waker);
1485 no_queue:
1486 return retval;
1487 }
1488
1489 static void __exit hid_exit(void)
1490 {
1491 usb_deregister(&hid_driver);
1492 usbhid_quirks_exit();
1493 hid_unregister_driver(&hid_usb_driver);
1494 destroy_workqueue(resumption_waker);
1495 }
1496
1497 module_init(hid_init);
1498 module_exit(hid_exit);
1499
1500 MODULE_AUTHOR("Andreas Gal");
1501 MODULE_AUTHOR("Vojtech Pavlik");
1502 MODULE_AUTHOR("Jiri Kosina");
1503 MODULE_DESCRIPTION(DRIVER_DESC);
1504 MODULE_LICENSE(DRIVER_LICENSE);
Linux kernel - Deliverables
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