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Merge branch 'master' into upstream
[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 hid_err(hid, "can't reset device, %s-%s/input%d, status %d\n",
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 hid_warn(urb->dev, "input irq status %d received\n",
282 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 hid_err(hid, "can't resubmit intr, %s-%s/input%d, status %d\n",
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 hid_err(hid, "usb_submit_urb(out) failed\n");
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 hid_err(hid, "usb_submit_urb(ctrl) failed\n");
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 hid_warn(urb->dev, "output irq status %d received\n",
417 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 hid_warn(urb->dev, "ctrl urb status %d received\n", status);
470 }
471
472 if (unplug)
473 usbhid->ctrltail = usbhid->ctrlhead;
474 else
475 usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1);
476
477 if (usbhid->ctrlhead != usbhid->ctrltail) {
478 if (hid_submit_ctrl(hid)) {
479 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
480 wake_up(&usbhid->wait);
481 }
482 spin_unlock(&usbhid->lock);
483 return;
484 }
485
486 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
487 spin_unlock(&usbhid->lock);
488 wake_up(&usbhid->wait);
489 }
490
491 static void __usbhid_submit_report(struct hid_device *hid, struct hid_report *report,
492 unsigned char dir)
493 {
494 int head;
495 struct usbhid_device *usbhid = hid->driver_data;
496 int len = ((report->size - 1) >> 3) + 1 + (report->id > 0);
497
498 if ((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN)
499 return;
500
501 if (usbhid->urbout && dir == USB_DIR_OUT && report->type == HID_OUTPUT_REPORT) {
502 if ((head = (usbhid->outhead + 1) & (HID_OUTPUT_FIFO_SIZE - 1)) == usbhid->outtail) {
503 hid_warn(hid, "output queue full\n");
504 return;
505 }
506
507 usbhid->out[usbhid->outhead].raw_report = kmalloc(len, GFP_ATOMIC);
508 if (!usbhid->out[usbhid->outhead].raw_report) {
509 hid_warn(hid, "output queueing failed\n");
510 return;
511 }
512 hid_output_report(report, usbhid->out[usbhid->outhead].raw_report);
513 usbhid->out[usbhid->outhead].report = report;
514 usbhid->outhead = head;
515
516 if (!test_and_set_bit(HID_OUT_RUNNING, &usbhid->iofl)) {
517 if (hid_submit_out(hid))
518 clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
519 } else {
520 /*
521 * the queue is known to run
522 * but an earlier request may be stuck
523 * we may need to time out
524 * no race because this is called under
525 * spinlock
526 */
527 if (time_after(jiffies, usbhid->last_out + HZ * 5))
528 usb_unlink_urb(usbhid->urbout);
529 }
530 return;
531 }
532
533 if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) {
534 hid_warn(hid, "control queue full\n");
535 return;
536 }
537
538 if (dir == USB_DIR_OUT) {
539 usbhid->ctrl[usbhid->ctrlhead].raw_report = kmalloc(len, GFP_ATOMIC);
540 if (!usbhid->ctrl[usbhid->ctrlhead].raw_report) {
541 hid_warn(hid, "control queueing failed\n");
542 return;
543 }
544 hid_output_report(report, usbhid->ctrl[usbhid->ctrlhead].raw_report);
545 }
546 usbhid->ctrl[usbhid->ctrlhead].report = report;
547 usbhid->ctrl[usbhid->ctrlhead].dir = dir;
548 usbhid->ctrlhead = head;
549
550 if (!test_and_set_bit(HID_CTRL_RUNNING, &usbhid->iofl)) {
551 if (hid_submit_ctrl(hid))
552 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
553 } else {
554 /*
555 * the queue is known to run
556 * but an earlier request may be stuck
557 * we may need to time out
558 * no race because this is called under
559 * spinlock
560 */
561 if (time_after(jiffies, usbhid->last_ctrl + HZ * 5))
562 usb_unlink_urb(usbhid->urbctrl);
563 }
564 }
565
566 void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
567 {
568 struct usbhid_device *usbhid = hid->driver_data;
569 unsigned long flags;
570
571 spin_lock_irqsave(&usbhid->lock, flags);
572 __usbhid_submit_report(hid, report, dir);
573 spin_unlock_irqrestore(&usbhid->lock, flags);
574 }
575 EXPORT_SYMBOL_GPL(usbhid_submit_report);
576
577 static int usb_hidinput_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
578 {
579 struct hid_device *hid = input_get_drvdata(dev);
580 struct usbhid_device *usbhid = hid->driver_data;
581 struct hid_field *field;
582 unsigned long flags;
583 int offset;
584
585 if (type == EV_FF)
586 return input_ff_event(dev, type, code, value);
587
588 if (type != EV_LED)
589 return -1;
590
591 if ((offset = hidinput_find_field(hid, type, code, &field)) == -1) {
592 hid_warn(dev, "event field not found\n");
593 return -1;
594 }
595
596 hid_set_field(field, offset, value);
597 if (value) {
598 spin_lock_irqsave(&usbhid->lock, flags);
599 usbhid->ledcount++;
600 spin_unlock_irqrestore(&usbhid->lock, flags);
601 } else {
602 spin_lock_irqsave(&usbhid->lock, flags);
603 usbhid->ledcount--;
604 spin_unlock_irqrestore(&usbhid->lock, flags);
605 }
606 usbhid_submit_report(hid, field->report, USB_DIR_OUT);
607
608 return 0;
609 }
610
611 int usbhid_wait_io(struct hid_device *hid)
612 {
613 struct usbhid_device *usbhid = hid->driver_data;
614
615 if (!wait_event_timeout(usbhid->wait,
616 (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl) &&
617 !test_bit(HID_OUT_RUNNING, &usbhid->iofl)),
618 10*HZ)) {
619 dbg_hid("timeout waiting for ctrl or out queue to clear\n");
620 return -1;
621 }
622
623 return 0;
624 }
625 EXPORT_SYMBOL_GPL(usbhid_wait_io);
626
627 static int hid_set_idle(struct usb_device *dev, int ifnum, int report, int idle)
628 {
629 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
630 HID_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE, (idle << 8) | report,
631 ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT);
632 }
633
634 static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
635 unsigned char type, void *buf, int size)
636 {
637 int result, retries = 4;
638
639 memset(buf, 0, size);
640
641 do {
642 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
643 USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
644 (type << 8), ifnum, buf, size, USB_CTRL_GET_TIMEOUT);
645 retries--;
646 } while (result < size && retries);
647 return result;
648 }
649
650 int usbhid_open(struct hid_device *hid)
651 {
652 struct usbhid_device *usbhid = hid->driver_data;
653 int res;
654
655 mutex_lock(&hid_open_mut);
656 if (!hid->open++) {
657 res = usb_autopm_get_interface(usbhid->intf);
658 /* the device must be awake to reliable request remote wakeup */
659 if (res < 0) {
660 hid->open--;
661 mutex_unlock(&hid_open_mut);
662 return -EIO;
663 }
664 usbhid->intf->needs_remote_wakeup = 1;
665 if (hid_start_in(hid))
666 hid_io_error(hid);
667
668 usb_autopm_put_interface(usbhid->intf);
669 }
670 mutex_unlock(&hid_open_mut);
671 return 0;
672 }
673
674 void usbhid_close(struct hid_device *hid)
675 {
676 struct usbhid_device *usbhid = hid->driver_data;
677
678 mutex_lock(&hid_open_mut);
679
680 /* protecting hid->open to make sure we don't restart
681 * data acquistion due to a resumption we no longer
682 * care about
683 */
684 spin_lock_irq(&usbhid->lock);
685 if (!--hid->open) {
686 spin_unlock_irq(&usbhid->lock);
687 hid_cancel_delayed_stuff(usbhid);
688 usb_kill_urb(usbhid->urbin);
689 usbhid->intf->needs_remote_wakeup = 0;
690 } else {
691 spin_unlock_irq(&usbhid->lock);
692 }
693 mutex_unlock(&hid_open_mut);
694 }
695
696 /*
697 * Initialize all reports
698 */
699
700 void usbhid_init_reports(struct hid_device *hid)
701 {
702 struct hid_report *report;
703 struct usbhid_device *usbhid = hid->driver_data;
704 int err, ret;
705
706 list_for_each_entry(report, &hid->report_enum[HID_INPUT_REPORT].report_list, list)
707 usbhid_submit_report(hid, report, USB_DIR_IN);
708
709 list_for_each_entry(report, &hid->report_enum[HID_FEATURE_REPORT].report_list, list)
710 usbhid_submit_report(hid, report, USB_DIR_IN);
711
712 err = 0;
713 ret = usbhid_wait_io(hid);
714 while (ret) {
715 err |= ret;
716 if (test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
717 usb_kill_urb(usbhid->urbctrl);
718 if (test_bit(HID_OUT_RUNNING, &usbhid->iofl))
719 usb_kill_urb(usbhid->urbout);
720 ret = usbhid_wait_io(hid);
721 }
722
723 if (err)
724 hid_warn(hid, "timeout initializing reports\n");
725 }
726
727 /*
728 * Reset LEDs which BIOS might have left on. For now, just NumLock (0x01).
729 */
730 static int hid_find_field_early(struct hid_device *hid, unsigned int page,
731 unsigned int hid_code, struct hid_field **pfield)
732 {
733 struct hid_report *report;
734 struct hid_field *field;
735 struct hid_usage *usage;
736 int i, j;
737
738 list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) {
739 for (i = 0; i < report->maxfield; i++) {
740 field = report->field[i];
741 for (j = 0; j < field->maxusage; j++) {
742 usage = &field->usage[j];
743 if ((usage->hid & HID_USAGE_PAGE) == page &&
744 (usage->hid & 0xFFFF) == hid_code) {
745 *pfield = field;
746 return j;
747 }
748 }
749 }
750 }
751 return -1;
752 }
753
754 void usbhid_set_leds(struct hid_device *hid)
755 {
756 struct hid_field *field;
757 int offset;
758
759 if ((offset = hid_find_field_early(hid, HID_UP_LED, 0x01, &field)) != -1) {
760 hid_set_field(field, offset, 0);
761 usbhid_submit_report(hid, field->report, USB_DIR_OUT);
762 }
763 }
764 EXPORT_SYMBOL_GPL(usbhid_set_leds);
765
766 /*
767 * Traverse the supplied list of reports and find the longest
768 */
769 static void hid_find_max_report(struct hid_device *hid, unsigned int type,
770 unsigned int *max)
771 {
772 struct hid_report *report;
773 unsigned int size;
774
775 list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
776 size = ((report->size - 1) >> 3) + 1 + hid->report_enum[type].numbered;
777 if (*max < size)
778 *max = size;
779 }
780 }
781
782 static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid)
783 {
784 struct usbhid_device *usbhid = hid->driver_data;
785
786 usbhid->inbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
787 &usbhid->inbuf_dma);
788 usbhid->outbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
789 &usbhid->outbuf_dma);
790 usbhid->cr = kmalloc(sizeof(*usbhid->cr), GFP_KERNEL);
791 usbhid->ctrlbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
792 &usbhid->ctrlbuf_dma);
793 if (!usbhid->inbuf || !usbhid->outbuf || !usbhid->cr ||
794 !usbhid->ctrlbuf)
795 return -1;
796
797 return 0;
798 }
799
800 static int usbhid_output_raw_report(struct hid_device *hid, __u8 *buf, size_t count,
801 unsigned char report_type)
802 {
803 struct usbhid_device *usbhid = hid->driver_data;
804 struct usb_device *dev = hid_to_usb_dev(hid);
805 struct usb_interface *intf = usbhid->intf;
806 struct usb_host_interface *interface = intf->cur_altsetting;
807 int ret;
808
809 if (usbhid->urbout && report_type != HID_FEATURE_REPORT) {
810 int actual_length;
811 int skipped_report_id = 0;
812
813 if (buf[0] == 0x0) {
814 /* Don't send the Report ID */
815 buf++;
816 count--;
817 skipped_report_id = 1;
818 }
819 ret = usb_interrupt_msg(dev, usbhid->urbout->pipe,
820 buf, count, &actual_length,
821 USB_CTRL_SET_TIMEOUT);
822 /* return the number of bytes transferred */
823 if (ret == 0) {
824 ret = actual_length;
825 /* count also the report id */
826 if (skipped_report_id)
827 ret++;
828 }
829 } else {
830 int skipped_report_id = 0;
831 int report_id = buf[0];
832 if (buf[0] == 0x0) {
833 /* Don't send the Report ID */
834 buf++;
835 count--;
836 skipped_report_id = 1;
837 }
838 ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
839 HID_REQ_SET_REPORT,
840 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
841 ((report_type + 1) << 8) | report_id,
842 interface->desc.bInterfaceNumber, buf, count,
843 USB_CTRL_SET_TIMEOUT);
844 /* count also the report id, if this was a numbered report. */
845 if (ret > 0 && skipped_report_id)
846 ret++;
847 }
848
849 return ret;
850 }
851
852 static void usbhid_restart_queues(struct usbhid_device *usbhid)
853 {
854 if (usbhid->urbout)
855 usbhid_restart_out_queue(usbhid);
856 usbhid_restart_ctrl_queue(usbhid);
857 }
858
859 static void __usbhid_restart_queues(struct work_struct *work)
860 {
861 struct usbhid_device *usbhid =
862 container_of(work, struct usbhid_device, restart_work);
863 int r;
864
865 r = usb_autopm_get_interface(usbhid->intf);
866 if (r < 0)
867 return;
868 usb_autopm_put_interface(usbhid->intf);
869 }
870
871 static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid)
872 {
873 struct usbhid_device *usbhid = hid->driver_data;
874
875 usb_free_coherent(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma);
876 usb_free_coherent(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma);
877 kfree(usbhid->cr);
878 usb_free_coherent(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma);
879 }
880
881 static int usbhid_parse(struct hid_device *hid)
882 {
883 struct usb_interface *intf = to_usb_interface(hid->dev.parent);
884 struct usb_host_interface *interface = intf->cur_altsetting;
885 struct usb_device *dev = interface_to_usbdev (intf);
886 struct hid_descriptor *hdesc;
887 u32 quirks = 0;
888 unsigned int rsize = 0;
889 char *rdesc;
890 int ret, n;
891
892 quirks = usbhid_lookup_quirk(le16_to_cpu(dev->descriptor.idVendor),
893 le16_to_cpu(dev->descriptor.idProduct));
894
895 if (quirks & HID_QUIRK_IGNORE)
896 return -ENODEV;
897
898 /* Many keyboards and mice don't like to be polled for reports,
899 * so we will always set the HID_QUIRK_NOGET flag for them. */
900 if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) {
901 if (interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_KEYBOARD ||
902 interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE)
903 quirks |= HID_QUIRK_NOGET;
904 }
905
906 if (usb_get_extra_descriptor(interface, HID_DT_HID, &hdesc) &&
907 (!interface->desc.bNumEndpoints ||
908 usb_get_extra_descriptor(&interface->endpoint[0], HID_DT_HID, &hdesc))) {
909 dbg_hid("class descriptor not present\n");
910 return -ENODEV;
911 }
912
913 hid->version = le16_to_cpu(hdesc->bcdHID);
914 hid->country = hdesc->bCountryCode;
915
916 for (n = 0; n < hdesc->bNumDescriptors; n++)
917 if (hdesc->desc[n].bDescriptorType == HID_DT_REPORT)
918 rsize = le16_to_cpu(hdesc->desc[n].wDescriptorLength);
919
920 if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
921 dbg_hid("weird size of report descriptor (%u)\n", rsize);
922 return -EINVAL;
923 }
924
925 if (!(rdesc = kmalloc(rsize, GFP_KERNEL))) {
926 dbg_hid("couldn't allocate rdesc memory\n");
927 return -ENOMEM;
928 }
929
930 hid_set_idle(dev, interface->desc.bInterfaceNumber, 0, 0);
931
932 ret = hid_get_class_descriptor(dev, interface->desc.bInterfaceNumber,
933 HID_DT_REPORT, rdesc, rsize);
934 if (ret < 0) {
935 dbg_hid("reading report descriptor failed\n");
936 kfree(rdesc);
937 goto err;
938 }
939
940 ret = hid_parse_report(hid, rdesc, rsize);
941 kfree(rdesc);
942 if (ret) {
943 dbg_hid("parsing report descriptor failed\n");
944 goto err;
945 }
946
947 hid->quirks |= quirks;
948
949 return 0;
950 err:
951 return ret;
952 }
953
954 static int usbhid_start(struct hid_device *hid)
955 {
956 struct usb_interface *intf = to_usb_interface(hid->dev.parent);
957 struct usb_host_interface *interface = intf->cur_altsetting;
958 struct usb_device *dev = interface_to_usbdev(intf);
959 struct usbhid_device *usbhid = hid->driver_data;
960 unsigned int n, insize = 0;
961 int ret;
962
963 clear_bit(HID_DISCONNECTED, &usbhid->iofl);
964
965 usbhid->bufsize = HID_MIN_BUFFER_SIZE;
966 hid_find_max_report(hid, HID_INPUT_REPORT, &usbhid->bufsize);
967 hid_find_max_report(hid, HID_OUTPUT_REPORT, &usbhid->bufsize);
968 hid_find_max_report(hid, HID_FEATURE_REPORT, &usbhid->bufsize);
969
970 if (usbhid->bufsize > HID_MAX_BUFFER_SIZE)
971 usbhid->bufsize = HID_MAX_BUFFER_SIZE;
972
973 hid_find_max_report(hid, HID_INPUT_REPORT, &insize);
974
975 if (insize > HID_MAX_BUFFER_SIZE)
976 insize = HID_MAX_BUFFER_SIZE;
977
978 if (hid_alloc_buffers(dev, hid)) {
979 ret = -ENOMEM;
980 goto fail;
981 }
982
983 for (n = 0; n < interface->desc.bNumEndpoints; n++) {
984 struct usb_endpoint_descriptor *endpoint;
985 int pipe;
986 int interval;
987
988 endpoint = &interface->endpoint[n].desc;
989 if (!usb_endpoint_xfer_int(endpoint))
990 continue;
991
992 interval = endpoint->bInterval;
993
994 /* Some vendors give fullspeed interval on highspeed devides */
995 if (hid->quirks & HID_QUIRK_FULLSPEED_INTERVAL &&
996 dev->speed == USB_SPEED_HIGH) {
997 interval = fls(endpoint->bInterval*8);
998 printk(KERN_INFO "%s: Fixing fullspeed to highspeed interval: %d -> %d\n",
999 hid->name, endpoint->bInterval, interval);
1000 }
1001
1002 /* Change the polling interval of mice. */
1003 if (hid->collection->usage == HID_GD_MOUSE && hid_mousepoll_interval > 0)
1004 interval = hid_mousepoll_interval;
1005
1006 ret = -ENOMEM;
1007 if (usb_endpoint_dir_in(endpoint)) {
1008 if (usbhid->urbin)
1009 continue;
1010 if (!(usbhid->urbin = usb_alloc_urb(0, GFP_KERNEL)))
1011 goto fail;
1012 pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
1013 usb_fill_int_urb(usbhid->urbin, dev, pipe, usbhid->inbuf, insize,
1014 hid_irq_in, hid, interval);
1015 usbhid->urbin->transfer_dma = usbhid->inbuf_dma;
1016 usbhid->urbin->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1017 } else {
1018 if (usbhid->urbout)
1019 continue;
1020 if (!(usbhid->urbout = usb_alloc_urb(0, GFP_KERNEL)))
1021 goto fail;
1022 pipe = usb_sndintpipe(dev, endpoint->bEndpointAddress);
1023 usb_fill_int_urb(usbhid->urbout, dev, pipe, usbhid->outbuf, 0,
1024 hid_irq_out, hid, interval);
1025 usbhid->urbout->transfer_dma = usbhid->outbuf_dma;
1026 usbhid->urbout->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1027 }
1028 }
1029
1030 usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL);
1031 if (!usbhid->urbctrl) {
1032 ret = -ENOMEM;
1033 goto fail;
1034 }
1035
1036 usb_fill_control_urb(usbhid->urbctrl, dev, 0, (void *) usbhid->cr,
1037 usbhid->ctrlbuf, 1, hid_ctrl, hid);
1038 usbhid->urbctrl->transfer_dma = usbhid->ctrlbuf_dma;
1039 usbhid->urbctrl->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1040
1041 if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS))
1042 usbhid_init_reports(hid);
1043
1044 set_bit(HID_STARTED, &usbhid->iofl);
1045
1046 /* Some keyboards don't work until their LEDs have been set.
1047 * Since BIOSes do set the LEDs, it must be safe for any device
1048 * that supports the keyboard boot protocol.
1049 * In addition, enable remote wakeup by default for all keyboard
1050 * devices supporting the boot protocol.
1051 */
1052 if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT &&
1053 interface->desc.bInterfaceProtocol ==
1054 USB_INTERFACE_PROTOCOL_KEYBOARD) {
1055 usbhid_set_leds(hid);
1056 device_set_wakeup_enable(&dev->dev, 1);
1057 }
1058 return 0;
1059
1060 fail:
1061 usb_free_urb(usbhid->urbin);
1062 usb_free_urb(usbhid->urbout);
1063 usb_free_urb(usbhid->urbctrl);
1064 usbhid->urbin = NULL;
1065 usbhid->urbout = NULL;
1066 usbhid->urbctrl = NULL;
1067 hid_free_buffers(dev, hid);
1068 return ret;
1069 }
1070
1071 static void usbhid_stop(struct hid_device *hid)
1072 {
1073 struct usbhid_device *usbhid = hid->driver_data;
1074
1075 if (WARN_ON(!usbhid))
1076 return;
1077
1078 clear_bit(HID_STARTED, &usbhid->iofl);
1079 spin_lock_irq(&usbhid->lock); /* Sync with error handler */
1080 set_bit(HID_DISCONNECTED, &usbhid->iofl);
1081 spin_unlock_irq(&usbhid->lock);
1082 usb_kill_urb(usbhid->urbin);
1083 usb_kill_urb(usbhid->urbout);
1084 usb_kill_urb(usbhid->urbctrl);
1085
1086 hid_cancel_delayed_stuff(usbhid);
1087
1088 hid->claimed = 0;
1089
1090 usb_free_urb(usbhid->urbin);
1091 usb_free_urb(usbhid->urbctrl);
1092 usb_free_urb(usbhid->urbout);
1093 usbhid->urbin = NULL; /* don't mess up next start */
1094 usbhid->urbctrl = NULL;
1095 usbhid->urbout = NULL;
1096
1097 hid_free_buffers(hid_to_usb_dev(hid), hid);
1098 }
1099
1100 static int usbhid_power(struct hid_device *hid, int lvl)
1101 {
1102 int r = 0;
1103
1104 switch (lvl) {
1105 case PM_HINT_FULLON:
1106 r = usbhid_get_power(hid);
1107 break;
1108 case PM_HINT_NORMAL:
1109 usbhid_put_power(hid);
1110 break;
1111 }
1112 return r;
1113 }
1114
1115 static struct hid_ll_driver usb_hid_driver = {
1116 .parse = usbhid_parse,
1117 .start = usbhid_start,
1118 .stop = usbhid_stop,
1119 .open = usbhid_open,
1120 .close = usbhid_close,
1121 .power = usbhid_power,
1122 .hidinput_input_event = usb_hidinput_input_event,
1123 };
1124
1125 static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *id)
1126 {
1127 struct usb_host_interface *interface = intf->cur_altsetting;
1128 struct usb_device *dev = interface_to_usbdev(intf);
1129 struct usbhid_device *usbhid;
1130 struct hid_device *hid;
1131 unsigned int n, has_in = 0;
1132 size_t len;
1133 int ret;
1134
1135 dbg_hid("HID probe called for ifnum %d\n",
1136 intf->altsetting->desc.bInterfaceNumber);
1137
1138 for (n = 0; n < interface->desc.bNumEndpoints; n++)
1139 if (usb_endpoint_is_int_in(&interface->endpoint[n].desc))
1140 has_in++;
1141 if (!has_in) {
1142 hid_err(intf, "couldn't find an input interrupt endpoint\n");
1143 return -ENODEV;
1144 }
1145
1146 hid = hid_allocate_device();
1147 if (IS_ERR(hid))
1148 return PTR_ERR(hid);
1149
1150 usb_set_intfdata(intf, hid);
1151 hid->ll_driver = &usb_hid_driver;
1152 hid->hid_output_raw_report = usbhid_output_raw_report;
1153 hid->ff_init = hid_pidff_init;
1154 #ifdef CONFIG_USB_HIDDEV
1155 hid->hiddev_connect = hiddev_connect;
1156 hid->hiddev_disconnect = hiddev_disconnect;
1157 hid->hiddev_hid_event = hiddev_hid_event;
1158 hid->hiddev_report_event = hiddev_report_event;
1159 #endif
1160 hid->dev.parent = &intf->dev;
1161 hid->bus = BUS_USB;
1162 hid->vendor = le16_to_cpu(dev->descriptor.idVendor);
1163 hid->product = le16_to_cpu(dev->descriptor.idProduct);
1164 hid->name[0] = 0;
1165 hid->quirks = usbhid_lookup_quirk(hid->vendor, hid->product);
1166 if (intf->cur_altsetting->desc.bInterfaceProtocol ==
1167 USB_INTERFACE_PROTOCOL_MOUSE)
1168 hid->type = HID_TYPE_USBMOUSE;
1169
1170 if (dev->manufacturer)
1171 strlcpy(hid->name, dev->manufacturer, sizeof(hid->name));
1172
1173 if (dev->product) {
1174 if (dev->manufacturer)
1175 strlcat(hid->name, " ", sizeof(hid->name));
1176 strlcat(hid->name, dev->product, sizeof(hid->name));
1177 }
1178
1179 if (!strlen(hid->name))
1180 snprintf(hid->name, sizeof(hid->name), "HID %04x:%04x",
1181 le16_to_cpu(dev->descriptor.idVendor),
1182 le16_to_cpu(dev->descriptor.idProduct));
1183
1184 usb_make_path(dev, hid->phys, sizeof(hid->phys));
1185 strlcat(hid->phys, "/input", sizeof(hid->phys));
1186 len = strlen(hid->phys);
1187 if (len < sizeof(hid->phys) - 1)
1188 snprintf(hid->phys + len, sizeof(hid->phys) - len,
1189 "%d", intf->altsetting[0].desc.bInterfaceNumber);
1190
1191 if (usb_string(dev, dev->descriptor.iSerialNumber, hid->uniq, 64) <= 0)
1192 hid->uniq[0] = 0;
1193
1194 usbhid = kzalloc(sizeof(*usbhid), GFP_KERNEL);
1195 if (usbhid == NULL) {
1196 ret = -ENOMEM;
1197 goto err;
1198 }
1199
1200 hid->driver_data = usbhid;
1201 usbhid->hid = hid;
1202 usbhid->intf = intf;
1203 usbhid->ifnum = interface->desc.bInterfaceNumber;
1204
1205 init_waitqueue_head(&usbhid->wait);
1206 INIT_WORK(&usbhid->reset_work, hid_reset);
1207 INIT_WORK(&usbhid->restart_work, __usbhid_restart_queues);
1208 setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);
1209 spin_lock_init(&usbhid->lock);
1210
1211 ret = hid_add_device(hid);
1212 if (ret) {
1213 if (ret != -ENODEV)
1214 hid_err(intf, "can't add hid device: %d\n", ret);
1215 goto err_free;
1216 }
1217
1218 return 0;
1219 err_free:
1220 kfree(usbhid);
1221 err:
1222 hid_destroy_device(hid);
1223 return ret;
1224 }
1225
1226 static void usbhid_disconnect(struct usb_interface *intf)
1227 {
1228 struct hid_device *hid = usb_get_intfdata(intf);
1229 struct usbhid_device *usbhid;
1230
1231 if (WARN_ON(!hid))
1232 return;
1233
1234 usbhid = hid->driver_data;
1235 hid_destroy_device(hid);
1236 kfree(usbhid);
1237 }
1238
1239 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid)
1240 {
1241 del_timer_sync(&usbhid->io_retry);
1242 cancel_work_sync(&usbhid->restart_work);
1243 cancel_work_sync(&usbhid->reset_work);
1244 }
1245
1246 static void hid_cease_io(struct usbhid_device *usbhid)
1247 {
1248 del_timer(&usbhid->io_retry);
1249 usb_kill_urb(usbhid->urbin);
1250 usb_kill_urb(usbhid->urbctrl);
1251 usb_kill_urb(usbhid->urbout);
1252 }
1253
1254 /* Treat USB reset pretty much the same as suspend/resume */
1255 static int hid_pre_reset(struct usb_interface *intf)
1256 {
1257 struct hid_device *hid = usb_get_intfdata(intf);
1258 struct usbhid_device *usbhid = hid->driver_data;
1259
1260 spin_lock_irq(&usbhid->lock);
1261 set_bit(HID_RESET_PENDING, &usbhid->iofl);
1262 spin_unlock_irq(&usbhid->lock);
1263 cancel_work_sync(&usbhid->restart_work);
1264 hid_cease_io(usbhid);
1265
1266 return 0;
1267 }
1268
1269 /* Same routine used for post_reset and reset_resume */
1270 static int hid_post_reset(struct usb_interface *intf)
1271 {
1272 struct usb_device *dev = interface_to_usbdev (intf);
1273 struct hid_device *hid = usb_get_intfdata(intf);
1274 struct usbhid_device *usbhid = hid->driver_data;
1275 int status;
1276
1277 spin_lock_irq(&usbhid->lock);
1278 clear_bit(HID_RESET_PENDING, &usbhid->iofl);
1279 spin_unlock_irq(&usbhid->lock);
1280 hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0);
1281 status = hid_start_in(hid);
1282 if (status < 0)
1283 hid_io_error(hid);
1284 usbhid_restart_queues(usbhid);
1285
1286 return 0;
1287 }
1288
1289 int usbhid_get_power(struct hid_device *hid)
1290 {
1291 struct usbhid_device *usbhid = hid->driver_data;
1292
1293 return usb_autopm_get_interface(usbhid->intf);
1294 }
1295
1296 void usbhid_put_power(struct hid_device *hid)
1297 {
1298 struct usbhid_device *usbhid = hid->driver_data;
1299
1300 usb_autopm_put_interface(usbhid->intf);
1301 }
1302
1303
1304 #ifdef CONFIG_PM
1305 static int hid_suspend(struct usb_interface *intf, pm_message_t message)
1306 {
1307 struct hid_device *hid = usb_get_intfdata(intf);
1308 struct usbhid_device *usbhid = hid->driver_data;
1309 int status;
1310
1311 if (message.event & PM_EVENT_AUTO) {
1312 spin_lock_irq(&usbhid->lock); /* Sync with error handler */
1313 if (!test_bit(HID_RESET_PENDING, &usbhid->iofl)
1314 && !test_bit(HID_CLEAR_HALT, &usbhid->iofl)
1315 && !test_bit(HID_OUT_RUNNING, &usbhid->iofl)
1316 && !test_bit(HID_CTRL_RUNNING, &usbhid->iofl)
1317 && !test_bit(HID_KEYS_PRESSED, &usbhid->iofl)
1318 && (!usbhid->ledcount || ignoreled))
1319 {
1320 set_bit(HID_REPORTED_IDLE, &usbhid->iofl);
1321 spin_unlock_irq(&usbhid->lock);
1322 if (hid->driver && hid->driver->suspend) {
1323 status = hid->driver->suspend(hid, message);
1324 if (status < 0)
1325 return status;
1326 }
1327 } else {
1328 usbhid_mark_busy(usbhid);
1329 spin_unlock_irq(&usbhid->lock);
1330 return -EBUSY;
1331 }
1332
1333 } else {
1334 if (hid->driver && hid->driver->suspend) {
1335 status = hid->driver->suspend(hid, message);
1336 if (status < 0)
1337 return status;
1338 }
1339 spin_lock_irq(&usbhid->lock);
1340 set_bit(HID_REPORTED_IDLE, &usbhid->iofl);
1341 spin_unlock_irq(&usbhid->lock);
1342 if (usbhid_wait_io(hid) < 0)
1343 return -EIO;
1344 }
1345
1346 if (!ignoreled && (message.event & PM_EVENT_AUTO)) {
1347 spin_lock_irq(&usbhid->lock);
1348 if (test_bit(HID_LED_ON, &usbhid->iofl)) {
1349 spin_unlock_irq(&usbhid->lock);
1350 usbhid_mark_busy(usbhid);
1351 return -EBUSY;
1352 }
1353 spin_unlock_irq(&usbhid->lock);
1354 }
1355
1356 hid_cancel_delayed_stuff(usbhid);
1357 hid_cease_io(usbhid);
1358
1359 if ((message.event & PM_EVENT_AUTO) &&
1360 test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) {
1361 /* lost race against keypresses */
1362 status = hid_start_in(hid);
1363 if (status < 0)
1364 hid_io_error(hid);
1365 usbhid_mark_busy(usbhid);
1366 return -EBUSY;
1367 }
1368 dev_dbg(&intf->dev, "suspend\n");
1369 return 0;
1370 }
1371
1372 static int hid_resume(struct usb_interface *intf)
1373 {
1374 struct hid_device *hid = usb_get_intfdata (intf);
1375 struct usbhid_device *usbhid = hid->driver_data;
1376 int status;
1377
1378 if (!test_bit(HID_STARTED, &usbhid->iofl))
1379 return 0;
1380
1381 clear_bit(HID_REPORTED_IDLE, &usbhid->iofl);
1382 usbhid_mark_busy(usbhid);
1383
1384 if (test_bit(HID_CLEAR_HALT, &usbhid->iofl) ||
1385 test_bit(HID_RESET_PENDING, &usbhid->iofl))
1386 schedule_work(&usbhid->reset_work);
1387 usbhid->retry_delay = 0;
1388 status = hid_start_in(hid);
1389 if (status < 0)
1390 hid_io_error(hid);
1391 usbhid_restart_queues(usbhid);
1392
1393 if (status >= 0 && hid->driver && hid->driver->resume) {
1394 int ret = hid->driver->resume(hid);
1395 if (ret < 0)
1396 status = ret;
1397 }
1398 dev_dbg(&intf->dev, "resume status %d\n", status);
1399 return 0;
1400 }
1401
1402 static int hid_reset_resume(struct usb_interface *intf)
1403 {
1404 struct hid_device *hid = usb_get_intfdata(intf);
1405 struct usbhid_device *usbhid = hid->driver_data;
1406 int status;
1407
1408 clear_bit(HID_REPORTED_IDLE, &usbhid->iofl);
1409 status = hid_post_reset(intf);
1410 if (status >= 0 && hid->driver && hid->driver->reset_resume) {
1411 int ret = hid->driver->reset_resume(hid);
1412 if (ret < 0)
1413 status = ret;
1414 }
1415 return status;
1416 }
1417
1418 #endif /* CONFIG_PM */
1419
1420 static const struct usb_device_id hid_usb_ids[] = {
1421 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
1422 .bInterfaceClass = USB_INTERFACE_CLASS_HID },
1423 { } /* Terminating entry */
1424 };
1425
1426 MODULE_DEVICE_TABLE (usb, hid_usb_ids);
1427
1428 static struct usb_driver hid_driver = {
1429 .name = "usbhid",
1430 .probe = usbhid_probe,
1431 .disconnect = usbhid_disconnect,
1432 #ifdef CONFIG_PM
1433 .suspend = hid_suspend,
1434 .resume = hid_resume,
1435 .reset_resume = hid_reset_resume,
1436 #endif
1437 .pre_reset = hid_pre_reset,
1438 .post_reset = hid_post_reset,
1439 .id_table = hid_usb_ids,
1440 .supports_autosuspend = 1,
1441 };
1442
1443 static const struct hid_device_id hid_usb_table[] = {
1444 { HID_USB_DEVICE(HID_ANY_ID, HID_ANY_ID) },
1445 { }
1446 };
1447
1448 struct usb_interface *usbhid_find_interface(int minor)
1449 {
1450 return usb_find_interface(&hid_driver, minor);
1451 }
1452
1453 static struct hid_driver hid_usb_driver = {
1454 .name = "generic-usb",
1455 .id_table = hid_usb_table,
1456 };
1457
1458 static int __init hid_init(void)
1459 {
1460 int retval = -ENOMEM;
1461
1462 resumption_waker = create_freezeable_workqueue("usbhid_resumer");
1463 if (!resumption_waker)
1464 goto no_queue;
1465 retval = hid_register_driver(&hid_usb_driver);
1466 if (retval)
1467 goto hid_register_fail;
1468 retval = usbhid_quirks_init(quirks_param);
1469 if (retval)
1470 goto usbhid_quirks_init_fail;
1471 retval = usb_register(&hid_driver);
1472 if (retval)
1473 goto usb_register_fail;
1474 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1475
1476 return 0;
1477 usb_register_fail:
1478 usbhid_quirks_exit();
1479 usbhid_quirks_init_fail:
1480 hid_unregister_driver(&hid_usb_driver);
1481 hid_register_fail:
1482 destroy_workqueue(resumption_waker);
1483 no_queue:
1484 return retval;
1485 }
1486
1487 static void __exit hid_exit(void)
1488 {
1489 usb_deregister(&hid_driver);
1490 usbhid_quirks_exit();
1491 hid_unregister_driver(&hid_usb_driver);
1492 destroy_workqueue(resumption_waker);
1493 }
1494
1495 module_init(hid_init);
1496 module_exit(hid_exit);
1497
1498 MODULE_AUTHOR("Andreas Gal");
1499 MODULE_AUTHOR("Vojtech Pavlik");
1500 MODULE_AUTHOR("Jiri Kosina");
1501 MODULE_DESCRIPTION(DRIVER_DESC);
1502 MODULE_LICENSE(DRIVER_LICENSE);
Linux kernel - Deliverables
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