projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
[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 #include <linux/string.h>
32
33 #include <linux/usb.h>
34
35 #include <linux/hid.h>
36 #include <linux/hiddev.h>
37 #include <linux/hid-debug.h>
38 #include <linux/hidraw.h>
39 #include "usbhid.h"
40
41 /*
42 * Version Information
43 */
44
45 #define DRIVER_DESC "USB HID core driver"
46 #define DRIVER_LICENSE "GPL"
47
48 /*
49 * Module parameters.
50 */
51
52 static unsigned int hid_mousepoll_interval;
53 module_param_named(mousepoll, hid_mousepoll_interval, uint, 0644);
54 MODULE_PARM_DESC(mousepoll, "Polling interval of mice");
55
56 static unsigned int ignoreled;
57 module_param_named(ignoreled, ignoreled, uint, 0644);
58 MODULE_PARM_DESC(ignoreled, "Autosuspend with active leds");
59
60 /* Quirks specified at module load time */
61 static char *quirks_param[MAX_USBHID_BOOT_QUIRKS];
62 module_param_array_named(quirks, quirks_param, charp, NULL, 0444);
63 MODULE_PARM_DESC(quirks, "Add/modify USB HID quirks by specifying "
64 " quirks=vendorID:productID:quirks"
65 " where vendorID, productID, and quirks are all in"
66 " 0x-prefixed hex");
67 /*
68 * Input submission and I/O error handler.
69 */
70 static DEFINE_MUTEX(hid_open_mut);
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_SUSPENDED, &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 if (rc == -ENOSPC)
93 set_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
94 } else {
95 clear_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
96 }
97 }
98 spin_unlock_irqrestore(&usbhid->lock, flags);
99 return rc;
100 }
101
102 /* I/O retry timer routine */
103 static void hid_retry_timeout(unsigned long _hid)
104 {
105 struct hid_device *hid = (struct hid_device *) _hid;
106 struct usbhid_device *usbhid = hid->driver_data;
107
108 dev_dbg(&usbhid->intf->dev, "retrying intr urb\n");
109 if (hid_start_in(hid))
110 hid_io_error(hid);
111 }
112
113 /* Workqueue routine to reset the device or clear a halt */
114 static void hid_reset(struct work_struct *work)
115 {
116 struct usbhid_device *usbhid =
117 container_of(work, struct usbhid_device, reset_work);
118 struct hid_device *hid = usbhid->hid;
119 int rc = 0;
120
121 if (test_bit(HID_CLEAR_HALT, &usbhid->iofl)) {
122 dev_dbg(&usbhid->intf->dev, "clear halt\n");
123 rc = usb_clear_halt(hid_to_usb_dev(hid), usbhid->urbin->pipe);
124 clear_bit(HID_CLEAR_HALT, &usbhid->iofl);
125 hid_start_in(hid);
126 }
127
128 else if (test_bit(HID_RESET_PENDING, &usbhid->iofl)) {
129 dev_dbg(&usbhid->intf->dev, "resetting device\n");
130 rc = usb_lock_device_for_reset(hid_to_usb_dev(hid), usbhid->intf);
131 if (rc == 0) {
132 rc = usb_reset_device(hid_to_usb_dev(hid));
133 usb_unlock_device(hid_to_usb_dev(hid));
134 }
135 clear_bit(HID_RESET_PENDING, &usbhid->iofl);
136 }
137
138 switch (rc) {
139 case 0:
140 if (!test_bit(HID_IN_RUNNING, &usbhid->iofl))
141 hid_io_error(hid);
142 break;
143 default:
144 hid_err(hid, "can't reset device, %s-%s/input%d, status %d\n",
145 hid_to_usb_dev(hid)->bus->bus_name,
146 hid_to_usb_dev(hid)->devpath,
147 usbhid->ifnum, rc);
148 /* FALLTHROUGH */
149 case -EHOSTUNREACH:
150 case -ENODEV:
151 case -EINTR:
152 break;
153 }
154 }
155
156 /* Main I/O error handler */
157 static void hid_io_error(struct hid_device *hid)
158 {
159 unsigned long flags;
160 struct usbhid_device *usbhid = hid->driver_data;
161
162 spin_lock_irqsave(&usbhid->lock, flags);
163
164 /* Stop when disconnected */
165 if (test_bit(HID_DISCONNECTED, &usbhid->iofl))
166 goto done;
167
168 /* If it has been a while since the last error, we'll assume
169 * this a brand new error and reset the retry timeout. */
170 if (time_after(jiffies, usbhid->stop_retry + HZ/2))
171 usbhid->retry_delay = 0;
172
173 /* When an error occurs, retry at increasing intervals */
174 if (usbhid->retry_delay == 0) {
175 usbhid->retry_delay = 13; /* Then 26, 52, 104, 104, ... */
176 usbhid->stop_retry = jiffies + msecs_to_jiffies(1000);
177 } else if (usbhid->retry_delay < 100)
178 usbhid->retry_delay *= 2;
179
180 if (time_after(jiffies, usbhid->stop_retry)) {
181
182 /* Retries failed, so do a port reset unless we lack bandwidth*/
183 if (test_bit(HID_NO_BANDWIDTH, &usbhid->iofl)
184 && !test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) {
185
186 schedule_work(&usbhid->reset_work);
187 goto done;
188 }
189 }
190
191 mod_timer(&usbhid->io_retry,
192 jiffies + msecs_to_jiffies(usbhid->retry_delay));
193 done:
194 spin_unlock_irqrestore(&usbhid->lock, flags);
195 }
196
197 static void usbhid_mark_busy(struct usbhid_device *usbhid)
198 {
199 struct usb_interface *intf = usbhid->intf;
200
201 usb_mark_last_busy(interface_to_usbdev(intf));
202 }
203
204 static int usbhid_restart_out_queue(struct usbhid_device *usbhid)
205 {
206 struct hid_device *hid = usb_get_intfdata(usbhid->intf);
207 int kicked;
208 int r;
209
210 if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
211 test_bit(HID_SUSPENDED, &usbhid->iofl))
212 return 0;
213
214 if ((kicked = (usbhid->outhead != usbhid->outtail))) {
215 hid_dbg(hid, "Kicking head %d tail %d", usbhid->outhead, usbhid->outtail);
216
217 /* Try to wake up from autosuspend... */
218 r = usb_autopm_get_interface_async(usbhid->intf);
219 if (r < 0)
220 return r;
221
222 /*
223 * If still suspended, don't submit. Submission will
224 * occur if/when resume drains the queue.
225 */
226 if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
227 usb_autopm_put_interface_no_suspend(usbhid->intf);
228 return r;
229 }
230
231 /* Asynchronously flush queue. */
232 set_bit(HID_OUT_RUNNING, &usbhid->iofl);
233 if (hid_submit_out(hid)) {
234 clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
235 usb_autopm_put_interface_async(usbhid->intf);
236 }
237 wake_up(&usbhid->wait);
238 }
239 return kicked;
240 }
241
242 static int usbhid_restart_ctrl_queue(struct usbhid_device *usbhid)
243 {
244 struct hid_device *hid = usb_get_intfdata(usbhid->intf);
245 int kicked;
246 int r;
247
248 WARN_ON(hid == NULL);
249 if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
250 test_bit(HID_SUSPENDED, &usbhid->iofl))
251 return 0;
252
253 if ((kicked = (usbhid->ctrlhead != usbhid->ctrltail))) {
254 hid_dbg(hid, "Kicking head %d tail %d", usbhid->ctrlhead, usbhid->ctrltail);
255
256 /* Try to wake up from autosuspend... */
257 r = usb_autopm_get_interface_async(usbhid->intf);
258 if (r < 0)
259 return r;
260
261 /*
262 * If still suspended, don't submit. Submission will
263 * occur if/when resume drains the queue.
264 */
265 if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
266 usb_autopm_put_interface_no_suspend(usbhid->intf);
267 return r;
268 }
269
270 /* Asynchronously flush queue. */
271 set_bit(HID_CTRL_RUNNING, &usbhid->iofl);
272 if (hid_submit_ctrl(hid)) {
273 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
274 usb_autopm_put_interface_async(usbhid->intf);
275 }
276 wake_up(&usbhid->wait);
277 }
278 return kicked;
279 }
280
281 /*
282 * Input interrupt completion handler.
283 */
284
285 static void hid_irq_in(struct urb *urb)
286 {
287 struct hid_device *hid = urb->context;
288 struct usbhid_device *usbhid = hid->driver_data;
289 int status;
290
291 switch (urb->status) {
292 case 0: /* success */
293 usbhid_mark_busy(usbhid);
294 usbhid->retry_delay = 0;
295 hid_input_report(urb->context, HID_INPUT_REPORT,
296 urb->transfer_buffer,
297 urb->actual_length, 1);
298 /*
299 * autosuspend refused while keys are pressed
300 * because most keyboards don't wake up when
301 * a key is released
302 */
303 if (hid_check_keys_pressed(hid))
304 set_bit(HID_KEYS_PRESSED, &usbhid->iofl);
305 else
306 clear_bit(HID_KEYS_PRESSED, &usbhid->iofl);
307 break;
308 case -EPIPE: /* stall */
309 usbhid_mark_busy(usbhid);
310 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
311 set_bit(HID_CLEAR_HALT, &usbhid->iofl);
312 schedule_work(&usbhid->reset_work);
313 return;
314 case -ECONNRESET: /* unlink */
315 case -ENOENT:
316 case -ESHUTDOWN: /* unplug */
317 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
318 return;
319 case -EILSEQ: /* protocol error or unplug */
320 case -EPROTO: /* protocol error or unplug */
321 case -ETIME: /* protocol error or unplug */
322 case -ETIMEDOUT: /* Should never happen, but... */
323 usbhid_mark_busy(usbhid);
324 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
325 hid_io_error(hid);
326 return;
327 default: /* error */
328 hid_warn(urb->dev, "input irq status %d received\n",
329 urb->status);
330 }
331
332 status = usb_submit_urb(urb, GFP_ATOMIC);
333 if (status) {
334 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
335 if (status != -EPERM) {
336 hid_err(hid, "can't resubmit intr, %s-%s/input%d, status %d\n",
337 hid_to_usb_dev(hid)->bus->bus_name,
338 hid_to_usb_dev(hid)->devpath,
339 usbhid->ifnum, status);
340 hid_io_error(hid);
341 }
342 }
343 }
344
345 static int hid_submit_out(struct hid_device *hid)
346 {
347 struct hid_report *report;
348 char *raw_report;
349 struct usbhid_device *usbhid = hid->driver_data;
350 int r;
351
352 report = usbhid->out[usbhid->outtail].report;
353 raw_report = usbhid->out[usbhid->outtail].raw_report;
354
355 usbhid->urbout->transfer_buffer_length = ((report->size - 1) >> 3) +
356 1 + (report->id > 0);
357 usbhid->urbout->dev = hid_to_usb_dev(hid);
358 if (raw_report) {
359 memcpy(usbhid->outbuf, raw_report,
360 usbhid->urbout->transfer_buffer_length);
361 kfree(raw_report);
362 usbhid->out[usbhid->outtail].raw_report = NULL;
363 }
364
365 dbg_hid("submitting out urb\n");
366
367 r = usb_submit_urb(usbhid->urbout, GFP_ATOMIC);
368 if (r < 0) {
369 hid_err(hid, "usb_submit_urb(out) failed: %d\n", r);
370 return r;
371 }
372 usbhid->last_out = jiffies;
373 return 0;
374 }
375
376 static int hid_submit_ctrl(struct hid_device *hid)
377 {
378 struct hid_report *report;
379 unsigned char dir;
380 char *raw_report;
381 int len, r;
382 struct usbhid_device *usbhid = hid->driver_data;
383
384 report = usbhid->ctrl[usbhid->ctrltail].report;
385 raw_report = usbhid->ctrl[usbhid->ctrltail].raw_report;
386 dir = usbhid->ctrl[usbhid->ctrltail].dir;
387
388 len = ((report->size - 1) >> 3) + 1 + (report->id > 0);
389 if (dir == USB_DIR_OUT) {
390 usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);
391 usbhid->urbctrl->transfer_buffer_length = len;
392 if (raw_report) {
393 memcpy(usbhid->ctrlbuf, raw_report, len);
394 kfree(raw_report);
395 usbhid->ctrl[usbhid->ctrltail].raw_report = NULL;
396 }
397 } else {
398 int maxpacket, padlen;
399
400 usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0);
401 maxpacket = usb_maxpacket(hid_to_usb_dev(hid),
402 usbhid->urbctrl->pipe, 0);
403 if (maxpacket > 0) {
404 padlen = DIV_ROUND_UP(len, maxpacket);
405 padlen *= maxpacket;
406 if (padlen > usbhid->bufsize)
407 padlen = usbhid->bufsize;
408 } else
409 padlen = 0;
410 usbhid->urbctrl->transfer_buffer_length = padlen;
411 }
412 usbhid->urbctrl->dev = hid_to_usb_dev(hid);
413
414 usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir;
415 usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT :
416 HID_REQ_GET_REPORT;
417 usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) |
418 report->id);
419 usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum);
420 usbhid->cr->wLength = cpu_to_le16(len);
421
422 dbg_hid("submitting ctrl urb: %s wValue=0x%04x wIndex=0x%04x wLength=%u\n",
423 usbhid->cr->bRequest == HID_REQ_SET_REPORT ? "Set_Report" :
424 "Get_Report",
425 usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength);
426
427 r = usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC);
428 if (r < 0) {
429 hid_err(hid, "usb_submit_urb(ctrl) failed: %d\n", r);
430 return r;
431 }
432 usbhid->last_ctrl = jiffies;
433 return 0;
434 }
435
436 /*
437 * Output interrupt completion handler.
438 */
439
440 static void hid_irq_out(struct urb *urb)
441 {
442 struct hid_device *hid = urb->context;
443 struct usbhid_device *usbhid = hid->driver_data;
444 unsigned long flags;
445 int unplug = 0;
446
447 switch (urb->status) {
448 case 0: /* success */
449 break;
450 case -ESHUTDOWN: /* unplug */
451 unplug = 1;
452 case -EILSEQ: /* protocol error or unplug */
453 case -EPROTO: /* protocol error or unplug */
454 case -ECONNRESET: /* unlink */
455 case -ENOENT:
456 break;
457 default: /* error */
458 hid_warn(urb->dev, "output irq status %d received\n",
459 urb->status);
460 }
461
462 spin_lock_irqsave(&usbhid->lock, flags);
463
464 if (unplug) {
465 usbhid->outtail = usbhid->outhead;
466 } else {
467 usbhid->outtail = (usbhid->outtail + 1) & (HID_OUTPUT_FIFO_SIZE - 1);
468
469 if (usbhid->outhead != usbhid->outtail &&
470 hid_submit_out(hid) == 0) {
471 /* Successfully submitted next urb in queue */
472 spin_unlock_irqrestore(&usbhid->lock, flags);
473 return;
474 }
475 }
476
477 clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
478 spin_unlock_irqrestore(&usbhid->lock, flags);
479 usb_autopm_put_interface_async(usbhid->intf);
480 wake_up(&usbhid->wait);
481 }
482
483 /*
484 * Control pipe completion handler.
485 */
486
487 static void hid_ctrl(struct urb *urb)
488 {
489 struct hid_device *hid = urb->context;
490 struct usbhid_device *usbhid = hid->driver_data;
491 int unplug = 0, status = urb->status;
492
493 spin_lock(&usbhid->lock);
494
495 switch (status) {
496 case 0: /* success */
497 if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_IN)
498 hid_input_report(urb->context,
499 usbhid->ctrl[usbhid->ctrltail].report->type,
500 urb->transfer_buffer, urb->actual_length, 0);
501 break;
502 case -ESHUTDOWN: /* unplug */
503 unplug = 1;
504 case -EILSEQ: /* protocol error or unplug */
505 case -EPROTO: /* protocol error or unplug */
506 case -ECONNRESET: /* unlink */
507 case -ENOENT:
508 case -EPIPE: /* report not available */
509 break;
510 default: /* error */
511 hid_warn(urb->dev, "ctrl urb status %d received\n", status);
512 }
513
514 if (unplug) {
515 usbhid->ctrltail = usbhid->ctrlhead;
516 } else {
517 usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1);
518
519 if (usbhid->ctrlhead != usbhid->ctrltail &&
520 hid_submit_ctrl(hid) == 0) {
521 /* Successfully submitted next urb in queue */
522 spin_unlock(&usbhid->lock);
523 return;
524 }
525 }
526
527 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
528 spin_unlock(&usbhid->lock);
529 usb_autopm_put_interface_async(usbhid->intf);
530 wake_up(&usbhid->wait);
531 }
532
533 static void __usbhid_submit_report(struct hid_device *hid, struct hid_report *report,
534 unsigned char dir)
535 {
536 int head;
537 struct usbhid_device *usbhid = hid->driver_data;
538
539 if (((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN) ||
540 test_bit(HID_DISCONNECTED, &usbhid->iofl))
541 return;
542
543 if (usbhid->urbout && dir == USB_DIR_OUT && report->type == HID_OUTPUT_REPORT) {
544 if ((head = (usbhid->outhead + 1) & (HID_OUTPUT_FIFO_SIZE - 1)) == usbhid->outtail) {
545 hid_warn(hid, "output queue full\n");
546 return;
547 }
548
549 usbhid->out[usbhid->outhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC);
550 if (!usbhid->out[usbhid->outhead].raw_report) {
551 hid_warn(hid, "output queueing failed\n");
552 return;
553 }
554 hid_output_report(report, usbhid->out[usbhid->outhead].raw_report);
555 usbhid->out[usbhid->outhead].report = report;
556 usbhid->outhead = head;
557
558 /* If the queue isn't running, restart it */
559 if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl)) {
560 usbhid_restart_out_queue(usbhid);
561
562 /* Otherwise see if an earlier request has timed out */
563 } else if (time_after(jiffies, usbhid->last_out + HZ * 5)) {
564
565 /* Prevent autosuspend following the unlink */
566 usb_autopm_get_interface_no_resume(usbhid->intf);
567
568 /*
569 * Prevent resubmission in case the URB completes
570 * before we can unlink it. We don't want to cancel
571 * the wrong transfer!
572 */
573 usb_block_urb(usbhid->urbout);
574
575 /* Drop lock to avoid deadlock if the callback runs */
576 spin_unlock(&usbhid->lock);
577
578 usb_unlink_urb(usbhid->urbout);
579 spin_lock(&usbhid->lock);
580 usb_unblock_urb(usbhid->urbout);
581
582 /* Unlink might have stopped the queue */
583 if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl))
584 usbhid_restart_out_queue(usbhid);
585
586 /* Now we can allow autosuspend again */
587 usb_autopm_put_interface_async(usbhid->intf);
588 }
589 return;
590 }
591
592 if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) {
593 hid_warn(hid, "control queue full\n");
594 return;
595 }
596
597 if (dir == USB_DIR_OUT) {
598 usbhid->ctrl[usbhid->ctrlhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC);
599 if (!usbhid->ctrl[usbhid->ctrlhead].raw_report) {
600 hid_warn(hid, "control queueing failed\n");
601 return;
602 }
603 hid_output_report(report, usbhid->ctrl[usbhid->ctrlhead].raw_report);
604 }
605 usbhid->ctrl[usbhid->ctrlhead].report = report;
606 usbhid->ctrl[usbhid->ctrlhead].dir = dir;
607 usbhid->ctrlhead = head;
608
609 /* If the queue isn't running, restart it */
610 if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl)) {
611 usbhid_restart_ctrl_queue(usbhid);
612
613 /* Otherwise see if an earlier request has timed out */
614 } else if (time_after(jiffies, usbhid->last_ctrl + HZ * 5)) {
615
616 /* Prevent autosuspend following the unlink */
617 usb_autopm_get_interface_no_resume(usbhid->intf);
618
619 /*
620 * Prevent resubmission in case the URB completes
621 * before we can unlink it. We don't want to cancel
622 * the wrong transfer!
623 */
624 usb_block_urb(usbhid->urbctrl);
625
626 /* Drop lock to avoid deadlock if the callback runs */
627 spin_unlock(&usbhid->lock);
628
629 usb_unlink_urb(usbhid->urbctrl);
630 spin_lock(&usbhid->lock);
631 usb_unblock_urb(usbhid->urbctrl);
632
633 /* Unlink might have stopped the queue */
634 if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
635 usbhid_restart_ctrl_queue(usbhid);
636
637 /* Now we can allow autosuspend again */
638 usb_autopm_put_interface_async(usbhid->intf);
639 }
640 }
641
642 static void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
643 {
644 struct usbhid_device *usbhid = hid->driver_data;
645 unsigned long flags;
646
647 spin_lock_irqsave(&usbhid->lock, flags);
648 __usbhid_submit_report(hid, report, dir);
649 spin_unlock_irqrestore(&usbhid->lock, flags);
650 }
651
652 static int usbhid_wait_io(struct hid_device *hid)
653 {
654 struct usbhid_device *usbhid = hid->driver_data;
655
656 if (!wait_event_timeout(usbhid->wait,
657 (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl) &&
658 !test_bit(HID_OUT_RUNNING, &usbhid->iofl)),
659 10*HZ)) {
660 dbg_hid("timeout waiting for ctrl or out queue to clear\n");
661 return -1;
662 }
663
664 return 0;
665 }
666
667 static int hid_set_idle(struct usb_device *dev, int ifnum, int report, int idle)
668 {
669 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
670 HID_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE, (idle << 8) | report,
671 ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT);
672 }
673
674 static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
675 unsigned char type, void *buf, int size)
676 {
677 int result, retries = 4;
678
679 memset(buf, 0, size);
680
681 do {
682 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
683 USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
684 (type << 8), ifnum, buf, size, USB_CTRL_GET_TIMEOUT);
685 retries--;
686 } while (result < size && retries);
687 return result;
688 }
689
690 int usbhid_open(struct hid_device *hid)
691 {
692 struct usbhid_device *usbhid = hid->driver_data;
693 int res = 0;
694
695 mutex_lock(&hid_open_mut);
696 if (!hid->open++) {
697 res = usb_autopm_get_interface(usbhid->intf);
698 /* the device must be awake to reliably request remote wakeup */
699 if (res < 0) {
700 hid->open--;
701 res = -EIO;
702 goto done;
703 }
704 usbhid->intf->needs_remote_wakeup = 1;
705 res = hid_start_in(hid);
706 if (res) {
707 if (res != -ENOSPC) {
708 hid_io_error(hid);
709 res = 0;
710 } else {
711 /* no use opening if resources are insufficient */
712 hid->open--;
713 res = -EBUSY;
714 usbhid->intf->needs_remote_wakeup = 0;
715 }
716 }
717 usb_autopm_put_interface(usbhid->intf);
718 }
719 done:
720 mutex_unlock(&hid_open_mut);
721 return res;
722 }
723
724 void usbhid_close(struct hid_device *hid)
725 {
726 struct usbhid_device *usbhid = hid->driver_data;
727
728 mutex_lock(&hid_open_mut);
729
730 /* protecting hid->open to make sure we don't restart
731 * data acquistion due to a resumption we no longer
732 * care about
733 */
734 spin_lock_irq(&usbhid->lock);
735 if (!--hid->open) {
736 spin_unlock_irq(&usbhid->lock);
737 hid_cancel_delayed_stuff(usbhid);
738 usb_kill_urb(usbhid->urbin);
739 usbhid->intf->needs_remote_wakeup = 0;
740 } else {
741 spin_unlock_irq(&usbhid->lock);
742 }
743 mutex_unlock(&hid_open_mut);
744 }
745
746 /*
747 * Initialize all reports
748 */
749
750 void usbhid_init_reports(struct hid_device *hid)
751 {
752 struct hid_report *report;
753 struct usbhid_device *usbhid = hid->driver_data;
754 struct hid_report_enum *report_enum;
755 int err, ret;
756
757 if (!(hid->quirks & HID_QUIRK_NO_INIT_INPUT_REPORTS)) {
758 report_enum = &hid->report_enum[HID_INPUT_REPORT];
759 list_for_each_entry(report, &report_enum->report_list, list)
760 usbhid_submit_report(hid, report, USB_DIR_IN);
761 }
762
763 report_enum = &hid->report_enum[HID_FEATURE_REPORT];
764 list_for_each_entry(report, &report_enum->report_list, list)
765 usbhid_submit_report(hid, report, USB_DIR_IN);
766
767 err = 0;
768 ret = usbhid_wait_io(hid);
769 while (ret) {
770 err |= ret;
771 if (test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
772 usb_kill_urb(usbhid->urbctrl);
773 if (test_bit(HID_OUT_RUNNING, &usbhid->iofl))
774 usb_kill_urb(usbhid->urbout);
775 ret = usbhid_wait_io(hid);
776 }
777
778 if (err)
779 hid_warn(hid, "timeout initializing reports\n");
780 }
781
782 /*
783 * Reset LEDs which BIOS might have left on. For now, just NumLock (0x01).
784 */
785 static int hid_find_field_early(struct hid_device *hid, unsigned int page,
786 unsigned int hid_code, struct hid_field **pfield)
787 {
788 struct hid_report *report;
789 struct hid_field *field;
790 struct hid_usage *usage;
791 int i, j;
792
793 list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) {
794 for (i = 0; i < report->maxfield; i++) {
795 field = report->field[i];
796 for (j = 0; j < field->maxusage; j++) {
797 usage = &field->usage[j];
798 if ((usage->hid & HID_USAGE_PAGE) == page &&
799 (usage->hid & 0xFFFF) == hid_code) {
800 *pfield = field;
801 return j;
802 }
803 }
804 }
805 }
806 return -1;
807 }
808
809 static void usbhid_set_leds(struct hid_device *hid)
810 {
811 struct hid_field *field;
812 int offset;
813
814 if ((offset = hid_find_field_early(hid, HID_UP_LED, 0x01, &field)) != -1) {
815 hid_set_field(field, offset, 0);
816 usbhid_submit_report(hid, field->report, USB_DIR_OUT);
817 }
818 }
819
820 /*
821 * Traverse the supplied list of reports and find the longest
822 */
823 static void hid_find_max_report(struct hid_device *hid, unsigned int type,
824 unsigned int *max)
825 {
826 struct hid_report *report;
827 unsigned int size;
828
829 list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
830 size = ((report->size - 1) >> 3) + 1 + hid->report_enum[type].numbered;
831 if (*max < size)
832 *max = size;
833 }
834 }
835
836 static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid)
837 {
838 struct usbhid_device *usbhid = hid->driver_data;
839
840 usbhid->inbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
841 &usbhid->inbuf_dma);
842 usbhid->outbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
843 &usbhid->outbuf_dma);
844 usbhid->cr = kmalloc(sizeof(*usbhid->cr), GFP_KERNEL);
845 usbhid->ctrlbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
846 &usbhid->ctrlbuf_dma);
847 if (!usbhid->inbuf || !usbhid->outbuf || !usbhid->cr ||
848 !usbhid->ctrlbuf)
849 return -1;
850
851 return 0;
852 }
853
854 static int usbhid_get_raw_report(struct hid_device *hid,
855 unsigned char report_number, __u8 *buf, size_t count,
856 unsigned char report_type)
857 {
858 struct usbhid_device *usbhid = hid->driver_data;
859 struct usb_device *dev = hid_to_usb_dev(hid);
860 struct usb_interface *intf = usbhid->intf;
861 struct usb_host_interface *interface = intf->cur_altsetting;
862 int skipped_report_id = 0;
863 int ret;
864
865 /* Byte 0 is the report number. Report data starts at byte 1.*/
866 buf[0] = report_number;
867 if (report_number == 0x0) {
868 /* Offset the return buffer by 1, so that the report ID
869 will remain in byte 0. */
870 buf++;
871 count--;
872 skipped_report_id = 1;
873 }
874 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
875 HID_REQ_GET_REPORT,
876 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
877 ((report_type + 1) << 8) | report_number,
878 interface->desc.bInterfaceNumber, buf, count,
879 USB_CTRL_SET_TIMEOUT);
880
881 /* count also the report id */
882 if (ret > 0 && skipped_report_id)
883 ret++;
884
885 return ret;
886 }
887
888 static int usbhid_set_raw_report(struct hid_device *hid, unsigned int reportnum,
889 __u8 *buf, size_t count, unsigned char rtype)
890 {
891 struct usbhid_device *usbhid = hid->driver_data;
892 struct usb_device *dev = hid_to_usb_dev(hid);
893 struct usb_interface *intf = usbhid->intf;
894 struct usb_host_interface *interface = intf->cur_altsetting;
895 int ret, skipped_report_id = 0;
896
897 /* Byte 0 is the report number. Report data starts at byte 1.*/
898 if ((rtype == HID_OUTPUT_REPORT) &&
899 (hid->quirks & HID_QUIRK_SKIP_OUTPUT_REPORT_ID))
900 buf[0] = 0;
901 else
902 buf[0] = reportnum;
903
904 if (buf[0] == 0x0) {
905 /* Don't send the Report ID */
906 buf++;
907 count--;
908 skipped_report_id = 1;
909 }
910
911 ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
912 HID_REQ_SET_REPORT,
913 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
914 ((rtype + 1) << 8) | reportnum,
915 interface->desc.bInterfaceNumber, buf, count,
916 USB_CTRL_SET_TIMEOUT);
917 /* count also the report id, if this was a numbered report. */
918 if (ret > 0 && skipped_report_id)
919 ret++;
920
921 return ret;
922 }
923
924 static int usbhid_output_report(struct hid_device *hid, __u8 *buf, size_t count)
925 {
926 struct usbhid_device *usbhid = hid->driver_data;
927 struct usb_device *dev = hid_to_usb_dev(hid);
928 int actual_length, skipped_report_id = 0, ret;
929
930 if (!usbhid->urbout)
931 return -ENOSYS;
932
933 if (buf[0] == 0x0) {
934 /* Don't send the Report ID */
935 buf++;
936 count--;
937 skipped_report_id = 1;
938 }
939
940 ret = usb_interrupt_msg(dev, usbhid->urbout->pipe,
941 buf, count, &actual_length,
942 USB_CTRL_SET_TIMEOUT);
943 /* return the number of bytes transferred */
944 if (ret == 0) {
945 ret = actual_length;
946 /* count also the report id */
947 if (skipped_report_id)
948 ret++;
949 }
950
951 return ret;
952 }
953
954 static void usbhid_restart_queues(struct usbhid_device *usbhid)
955 {
956 if (usbhid->urbout && !test_bit(HID_OUT_RUNNING, &usbhid->iofl))
957 usbhid_restart_out_queue(usbhid);
958 if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
959 usbhid_restart_ctrl_queue(usbhid);
960 }
961
962 static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid)
963 {
964 struct usbhid_device *usbhid = hid->driver_data;
965
966 usb_free_coherent(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma);
967 usb_free_coherent(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma);
968 kfree(usbhid->cr);
969 usb_free_coherent(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma);
970 }
971
972 static int usbhid_parse(struct hid_device *hid)
973 {
974 struct usb_interface *intf = to_usb_interface(hid->dev.parent);
975 struct usb_host_interface *interface = intf->cur_altsetting;
976 struct usb_device *dev = interface_to_usbdev (intf);
977 struct hid_descriptor *hdesc;
978 u32 quirks = 0;
979 unsigned int rsize = 0;
980 char *rdesc;
981 int ret, n;
982
983 quirks = usbhid_lookup_quirk(le16_to_cpu(dev->descriptor.idVendor),
984 le16_to_cpu(dev->descriptor.idProduct));
985
986 if (quirks & HID_QUIRK_IGNORE)
987 return -ENODEV;
988
989 /* Many keyboards and mice don't like to be polled for reports,
990 * so we will always set the HID_QUIRK_NOGET flag for them. */
991 if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) {
992 if (interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_KEYBOARD ||
993 interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE)
994 quirks |= HID_QUIRK_NOGET;
995 }
996
997 if (usb_get_extra_descriptor(interface, HID_DT_HID, &hdesc) &&
998 (!interface->desc.bNumEndpoints ||
999 usb_get_extra_descriptor(&interface->endpoint[0], HID_DT_HID, &hdesc))) {
1000 dbg_hid("class descriptor not present\n");
1001 return -ENODEV;
1002 }
1003
1004 hid->version = le16_to_cpu(hdesc->bcdHID);
1005 hid->country = hdesc->bCountryCode;
1006
1007 for (n = 0; n < hdesc->bNumDescriptors; n++)
1008 if (hdesc->desc[n].bDescriptorType == HID_DT_REPORT)
1009 rsize = le16_to_cpu(hdesc->desc[n].wDescriptorLength);
1010
1011 if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
1012 dbg_hid("weird size of report descriptor (%u)\n", rsize);
1013 return -EINVAL;
1014 }
1015
1016 if (!(rdesc = kmalloc(rsize, GFP_KERNEL))) {
1017 dbg_hid("couldn't allocate rdesc memory\n");
1018 return -ENOMEM;
1019 }
1020
1021 hid_set_idle(dev, interface->desc.bInterfaceNumber, 0, 0);
1022
1023 ret = hid_get_class_descriptor(dev, interface->desc.bInterfaceNumber,
1024 HID_DT_REPORT, rdesc, rsize);
1025 if (ret < 0) {
1026 dbg_hid("reading report descriptor failed\n");
1027 kfree(rdesc);
1028 goto err;
1029 }
1030
1031 ret = hid_parse_report(hid, rdesc, rsize);
1032 kfree(rdesc);
1033 if (ret) {
1034 dbg_hid("parsing report descriptor failed\n");
1035 goto err;
1036 }
1037
1038 hid->quirks |= quirks;
1039
1040 return 0;
1041 err:
1042 return ret;
1043 }
1044
1045 static int usbhid_start(struct hid_device *hid)
1046 {
1047 struct usb_interface *intf = to_usb_interface(hid->dev.parent);
1048 struct usb_host_interface *interface = intf->cur_altsetting;
1049 struct usb_device *dev = interface_to_usbdev(intf);
1050 struct usbhid_device *usbhid = hid->driver_data;
1051 unsigned int n, insize = 0;
1052 int ret;
1053
1054 clear_bit(HID_DISCONNECTED, &usbhid->iofl);
1055
1056 usbhid->bufsize = HID_MIN_BUFFER_SIZE;
1057 hid_find_max_report(hid, HID_INPUT_REPORT, &usbhid->bufsize);
1058 hid_find_max_report(hid, HID_OUTPUT_REPORT, &usbhid->bufsize);
1059 hid_find_max_report(hid, HID_FEATURE_REPORT, &usbhid->bufsize);
1060
1061 if (usbhid->bufsize > HID_MAX_BUFFER_SIZE)
1062 usbhid->bufsize = HID_MAX_BUFFER_SIZE;
1063
1064 hid_find_max_report(hid, HID_INPUT_REPORT, &insize);
1065
1066 if (insize > HID_MAX_BUFFER_SIZE)
1067 insize = HID_MAX_BUFFER_SIZE;
1068
1069 if (hid_alloc_buffers(dev, hid)) {
1070 ret = -ENOMEM;
1071 goto fail;
1072 }
1073
1074 for (n = 0; n < interface->desc.bNumEndpoints; n++) {
1075 struct usb_endpoint_descriptor *endpoint;
1076 int pipe;
1077 int interval;
1078
1079 endpoint = &interface->endpoint[n].desc;
1080 if (!usb_endpoint_xfer_int(endpoint))
1081 continue;
1082
1083 interval = endpoint->bInterval;
1084
1085 /* Some vendors give fullspeed interval on highspeed devides */
1086 if (hid->quirks & HID_QUIRK_FULLSPEED_INTERVAL &&
1087 dev->speed == USB_SPEED_HIGH) {
1088 interval = fls(endpoint->bInterval*8);
1089 printk(KERN_INFO "%s: Fixing fullspeed to highspeed interval: %d -> %d\n",
1090 hid->name, endpoint->bInterval, interval);
1091 }
1092
1093 /* Change the polling interval of mice. */
1094 if (hid->collection->usage == HID_GD_MOUSE && hid_mousepoll_interval > 0)
1095 interval = hid_mousepoll_interval;
1096
1097 ret = -ENOMEM;
1098 if (usb_endpoint_dir_in(endpoint)) {
1099 if (usbhid->urbin)
1100 continue;
1101 if (!(usbhid->urbin = usb_alloc_urb(0, GFP_KERNEL)))
1102 goto fail;
1103 pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
1104 usb_fill_int_urb(usbhid->urbin, dev, pipe, usbhid->inbuf, insize,
1105 hid_irq_in, hid, interval);
1106 usbhid->urbin->transfer_dma = usbhid->inbuf_dma;
1107 usbhid->urbin->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1108 } else {
1109 if (usbhid->urbout)
1110 continue;
1111 if (!(usbhid->urbout = usb_alloc_urb(0, GFP_KERNEL)))
1112 goto fail;
1113 pipe = usb_sndintpipe(dev, endpoint->bEndpointAddress);
1114 usb_fill_int_urb(usbhid->urbout, dev, pipe, usbhid->outbuf, 0,
1115 hid_irq_out, hid, interval);
1116 usbhid->urbout->transfer_dma = usbhid->outbuf_dma;
1117 usbhid->urbout->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1118 }
1119 }
1120
1121 usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL);
1122 if (!usbhid->urbctrl) {
1123 ret = -ENOMEM;
1124 goto fail;
1125 }
1126
1127 usb_fill_control_urb(usbhid->urbctrl, dev, 0, (void *) usbhid->cr,
1128 usbhid->ctrlbuf, 1, hid_ctrl, hid);
1129 usbhid->urbctrl->transfer_dma = usbhid->ctrlbuf_dma;
1130 usbhid->urbctrl->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1131
1132 if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS))
1133 usbhid_init_reports(hid);
1134
1135 set_bit(HID_STARTED, &usbhid->iofl);
1136
1137 /* Some keyboards don't work until their LEDs have been set.
1138 * Since BIOSes do set the LEDs, it must be safe for any device
1139 * that supports the keyboard boot protocol.
1140 * In addition, enable remote wakeup by default for all keyboard
1141 * devices supporting the boot protocol.
1142 */
1143 if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT &&
1144 interface->desc.bInterfaceProtocol ==
1145 USB_INTERFACE_PROTOCOL_KEYBOARD) {
1146 usbhid_set_leds(hid);
1147 device_set_wakeup_enable(&dev->dev, 1);
1148 }
1149 return 0;
1150
1151 fail:
1152 usb_free_urb(usbhid->urbin);
1153 usb_free_urb(usbhid->urbout);
1154 usb_free_urb(usbhid->urbctrl);
1155 usbhid->urbin = NULL;
1156 usbhid->urbout = NULL;
1157 usbhid->urbctrl = NULL;
1158 hid_free_buffers(dev, hid);
1159 return ret;
1160 }
1161
1162 static void usbhid_stop(struct hid_device *hid)
1163 {
1164 struct usbhid_device *usbhid = hid->driver_data;
1165
1166 if (WARN_ON(!usbhid))
1167 return;
1168
1169 clear_bit(HID_STARTED, &usbhid->iofl);
1170 spin_lock_irq(&usbhid->lock); /* Sync with error and led handlers */
1171 set_bit(HID_DISCONNECTED, &usbhid->iofl);
1172 spin_unlock_irq(&usbhid->lock);
1173 usb_kill_urb(usbhid->urbin);
1174 usb_kill_urb(usbhid->urbout);
1175 usb_kill_urb(usbhid->urbctrl);
1176
1177 hid_cancel_delayed_stuff(usbhid);
1178
1179 hid->claimed = 0;
1180
1181 usb_free_urb(usbhid->urbin);
1182 usb_free_urb(usbhid->urbctrl);
1183 usb_free_urb(usbhid->urbout);
1184 usbhid->urbin = NULL; /* don't mess up next start */
1185 usbhid->urbctrl = NULL;
1186 usbhid->urbout = NULL;
1187
1188 hid_free_buffers(hid_to_usb_dev(hid), hid);
1189 }
1190
1191 static int usbhid_power(struct hid_device *hid, int lvl)
1192 {
1193 int r = 0;
1194
1195 switch (lvl) {
1196 case PM_HINT_FULLON:
1197 r = usbhid_get_power(hid);
1198 break;
1199 case PM_HINT_NORMAL:
1200 usbhid_put_power(hid);
1201 break;
1202 }
1203 return r;
1204 }
1205
1206 static void usbhid_request(struct hid_device *hid, struct hid_report *rep, int reqtype)
1207 {
1208 switch (reqtype) {
1209 case HID_REQ_GET_REPORT:
1210 usbhid_submit_report(hid, rep, USB_DIR_IN);
1211 break;
1212 case HID_REQ_SET_REPORT:
1213 usbhid_submit_report(hid, rep, USB_DIR_OUT);
1214 break;
1215 }
1216 }
1217
1218 static int usbhid_raw_request(struct hid_device *hid, unsigned char reportnum,
1219 __u8 *buf, size_t len, unsigned char rtype,
1220 int reqtype)
1221 {
1222 switch (reqtype) {
1223 case HID_REQ_GET_REPORT:
1224 return usbhid_get_raw_report(hid, reportnum, buf, len, rtype);
1225 case HID_REQ_SET_REPORT:
1226 return usbhid_set_raw_report(hid, reportnum, buf, len, rtype);
1227 default:
1228 return -EIO;
1229 }
1230 }
1231
1232 static int usbhid_idle(struct hid_device *hid, int report, int idle,
1233 int reqtype)
1234 {
1235 struct usb_device *dev = hid_to_usb_dev(hid);
1236 struct usb_interface *intf = to_usb_interface(hid->dev.parent);
1237 struct usb_host_interface *interface = intf->cur_altsetting;
1238 int ifnum = interface->desc.bInterfaceNumber;
1239
1240 if (reqtype != HID_REQ_SET_IDLE)
1241 return -EINVAL;
1242
1243 return hid_set_idle(dev, ifnum, report, idle);
1244 }
1245
1246 static struct hid_ll_driver usb_hid_driver = {
1247 .parse = usbhid_parse,
1248 .start = usbhid_start,
1249 .stop = usbhid_stop,
1250 .open = usbhid_open,
1251 .close = usbhid_close,
1252 .power = usbhid_power,
1253 .request = usbhid_request,
1254 .wait = usbhid_wait_io,
1255 .raw_request = usbhid_raw_request,
1256 .output_report = usbhid_output_report,
1257 .idle = usbhid_idle,
1258 };
1259
1260 static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *id)
1261 {
1262 struct usb_host_interface *interface = intf->cur_altsetting;
1263 struct usb_device *dev = interface_to_usbdev(intf);
1264 struct usbhid_device *usbhid;
1265 struct hid_device *hid;
1266 unsigned int n, has_in = 0;
1267 size_t len;
1268 int ret;
1269
1270 dbg_hid("HID probe called for ifnum %d\n",
1271 intf->altsetting->desc.bInterfaceNumber);
1272
1273 for (n = 0; n < interface->desc.bNumEndpoints; n++)
1274 if (usb_endpoint_is_int_in(&interface->endpoint[n].desc))
1275 has_in++;
1276 if (!has_in) {
1277 hid_err(intf, "couldn't find an input interrupt endpoint\n");
1278 return -ENODEV;
1279 }
1280
1281 hid = hid_allocate_device();
1282 if (IS_ERR(hid))
1283 return PTR_ERR(hid);
1284
1285 usb_set_intfdata(intf, hid);
1286 hid->ll_driver = &usb_hid_driver;
1287 hid->ff_init = hid_pidff_init;
1288 #ifdef CONFIG_USB_HIDDEV
1289 hid->hiddev_connect = hiddev_connect;
1290 hid->hiddev_disconnect = hiddev_disconnect;
1291 hid->hiddev_hid_event = hiddev_hid_event;
1292 hid->hiddev_report_event = hiddev_report_event;
1293 #endif
1294 hid->dev.parent = &intf->dev;
1295 hid->bus = BUS_USB;
1296 hid->vendor = le16_to_cpu(dev->descriptor.idVendor);
1297 hid->product = le16_to_cpu(dev->descriptor.idProduct);
1298 hid->name[0] = 0;
1299 hid->quirks = usbhid_lookup_quirk(hid->vendor, hid->product);
1300 if (intf->cur_altsetting->desc.bInterfaceProtocol ==
1301 USB_INTERFACE_PROTOCOL_MOUSE)
1302 hid->type = HID_TYPE_USBMOUSE;
1303 else if (intf->cur_altsetting->desc.bInterfaceProtocol == 0)
1304 hid->type = HID_TYPE_USBNONE;
1305
1306 if (dev->manufacturer)
1307 strlcpy(hid->name, dev->manufacturer, sizeof(hid->name));
1308
1309 if (dev->product) {
1310 if (dev->manufacturer)
1311 strlcat(hid->name, " ", sizeof(hid->name));
1312 strlcat(hid->name, dev->product, sizeof(hid->name));
1313 }
1314
1315 if (!strlen(hid->name))
1316 snprintf(hid->name, sizeof(hid->name), "HID %04x:%04x",
1317 le16_to_cpu(dev->descriptor.idVendor),
1318 le16_to_cpu(dev->descriptor.idProduct));
1319
1320 usb_make_path(dev, hid->phys, sizeof(hid->phys));
1321 strlcat(hid->phys, "/input", sizeof(hid->phys));
1322 len = strlen(hid->phys);
1323 if (len < sizeof(hid->phys) - 1)
1324 snprintf(hid->phys + len, sizeof(hid->phys) - len,
1325 "%d", intf->altsetting[0].desc.bInterfaceNumber);
1326
1327 if (usb_string(dev, dev->descriptor.iSerialNumber, hid->uniq, 64) <= 0)
1328 hid->uniq[0] = 0;
1329
1330 usbhid = kzalloc(sizeof(*usbhid), GFP_KERNEL);
1331 if (usbhid == NULL) {
1332 ret = -ENOMEM;
1333 goto err;
1334 }
1335
1336 hid->driver_data = usbhid;
1337 usbhid->hid = hid;
1338 usbhid->intf = intf;
1339 usbhid->ifnum = interface->desc.bInterfaceNumber;
1340
1341 init_waitqueue_head(&usbhid->wait);
1342 INIT_WORK(&usbhid->reset_work, hid_reset);
1343 setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);
1344 spin_lock_init(&usbhid->lock);
1345
1346 ret = hid_add_device(hid);
1347 if (ret) {
1348 if (ret != -ENODEV)
1349 hid_err(intf, "can't add hid device: %d\n", ret);
1350 goto err_free;
1351 }
1352
1353 return 0;
1354 err_free:
1355 kfree(usbhid);
1356 err:
1357 hid_destroy_device(hid);
1358 return ret;
1359 }
1360
1361 static void usbhid_disconnect(struct usb_interface *intf)
1362 {
1363 struct hid_device *hid = usb_get_intfdata(intf);
1364 struct usbhid_device *usbhid;
1365
1366 if (WARN_ON(!hid))
1367 return;
1368
1369 usbhid = hid->driver_data;
1370 spin_lock_irq(&usbhid->lock); /* Sync with error and led handlers */
1371 set_bit(HID_DISCONNECTED, &usbhid->iofl);
1372 spin_unlock_irq(&usbhid->lock);
1373 hid_destroy_device(hid);
1374 kfree(usbhid);
1375 }
1376
1377 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid)
1378 {
1379 del_timer_sync(&usbhid->io_retry);
1380 cancel_work_sync(&usbhid->reset_work);
1381 }
1382
1383 static void hid_cease_io(struct usbhid_device *usbhid)
1384 {
1385 del_timer_sync(&usbhid->io_retry);
1386 usb_kill_urb(usbhid->urbin);
1387 usb_kill_urb(usbhid->urbctrl);
1388 usb_kill_urb(usbhid->urbout);
1389 }
1390
1391 /* Treat USB reset pretty much the same as suspend/resume */
1392 static int hid_pre_reset(struct usb_interface *intf)
1393 {
1394 struct hid_device *hid = usb_get_intfdata(intf);
1395 struct usbhid_device *usbhid = hid->driver_data;
1396
1397 spin_lock_irq(&usbhid->lock);
1398 set_bit(HID_RESET_PENDING, &usbhid->iofl);
1399 spin_unlock_irq(&usbhid->lock);
1400 hid_cease_io(usbhid);
1401
1402 return 0;
1403 }
1404
1405 /* Same routine used for post_reset and reset_resume */
1406 static int hid_post_reset(struct usb_interface *intf)
1407 {
1408 struct usb_device *dev = interface_to_usbdev (intf);
1409 struct hid_device *hid = usb_get_intfdata(intf);
1410 struct usbhid_device *usbhid = hid->driver_data;
1411 struct usb_host_interface *interface = intf->cur_altsetting;
1412 int status;
1413 char *rdesc;
1414
1415 /* Fetch and examine the HID report descriptor. If this
1416 * has changed, then rebind. Since usbcore's check of the
1417 * configuration descriptors passed, we already know that
1418 * the size of the HID report descriptor has not changed.
1419 */
1420 rdesc = kmalloc(hid->dev_rsize, GFP_KERNEL);
1421 if (!rdesc) {
1422 dbg_hid("couldn't allocate rdesc memory (post_reset)\n");
1423 return 1;
1424 }
1425 status = hid_get_class_descriptor(dev,
1426 interface->desc.bInterfaceNumber,
1427 HID_DT_REPORT, rdesc, hid->dev_rsize);
1428 if (status < 0) {
1429 dbg_hid("reading report descriptor failed (post_reset)\n");
1430 kfree(rdesc);
1431 return 1;
1432 }
1433 status = memcmp(rdesc, hid->dev_rdesc, hid->dev_rsize);
1434 kfree(rdesc);
1435 if (status != 0) {
1436 dbg_hid("report descriptor changed\n");
1437 return 1;
1438 }
1439
1440 spin_lock_irq(&usbhid->lock);
1441 clear_bit(HID_RESET_PENDING, &usbhid->iofl);
1442 spin_unlock_irq(&usbhid->lock);
1443 hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0);
1444 status = hid_start_in(hid);
1445 if (status < 0)
1446 hid_io_error(hid);
1447 usbhid_restart_queues(usbhid);
1448
1449 return 0;
1450 }
1451
1452 int usbhid_get_power(struct hid_device *hid)
1453 {
1454 struct usbhid_device *usbhid = hid->driver_data;
1455
1456 return usb_autopm_get_interface(usbhid->intf);
1457 }
1458
1459 void usbhid_put_power(struct hid_device *hid)
1460 {
1461 struct usbhid_device *usbhid = hid->driver_data;
1462
1463 usb_autopm_put_interface(usbhid->intf);
1464 }
1465
1466
1467 #ifdef CONFIG_PM
1468 static int hid_resume_common(struct hid_device *hid, bool driver_suspended)
1469 {
1470 struct usbhid_device *usbhid = hid->driver_data;
1471 int status;
1472
1473 spin_lock_irq(&usbhid->lock);
1474 clear_bit(HID_SUSPENDED, &usbhid->iofl);
1475 usbhid_mark_busy(usbhid);
1476
1477 if (test_bit(HID_CLEAR_HALT, &usbhid->iofl) ||
1478 test_bit(HID_RESET_PENDING, &usbhid->iofl))
1479 schedule_work(&usbhid->reset_work);
1480 usbhid->retry_delay = 0;
1481
1482 usbhid_restart_queues(usbhid);
1483 spin_unlock_irq(&usbhid->lock);
1484
1485 status = hid_start_in(hid);
1486 if (status < 0)
1487 hid_io_error(hid);
1488
1489 if (driver_suspended && hid->driver && hid->driver->resume)
1490 status = hid->driver->resume(hid);
1491 return status;
1492 }
1493
1494 static int hid_suspend(struct usb_interface *intf, pm_message_t message)
1495 {
1496 struct hid_device *hid = usb_get_intfdata(intf);
1497 struct usbhid_device *usbhid = hid->driver_data;
1498 int status = 0;
1499 bool driver_suspended = false;
1500 unsigned int ledcount;
1501
1502 if (PMSG_IS_AUTO(message)) {
1503 ledcount = hidinput_count_leds(hid);
1504 spin_lock_irq(&usbhid->lock); /* Sync with error handler */
1505 if (!test_bit(HID_RESET_PENDING, &usbhid->iofl)
1506 && !test_bit(HID_CLEAR_HALT, &usbhid->iofl)
1507 && !test_bit(HID_OUT_RUNNING, &usbhid->iofl)
1508 && !test_bit(HID_CTRL_RUNNING, &usbhid->iofl)
1509 && !test_bit(HID_KEYS_PRESSED, &usbhid->iofl)
1510 && (!ledcount || ignoreled))
1511 {
1512 set_bit(HID_SUSPENDED, &usbhid->iofl);
1513 spin_unlock_irq(&usbhid->lock);
1514 if (hid->driver && hid->driver->suspend) {
1515 status = hid->driver->suspend(hid, message);
1516 if (status < 0)
1517 goto failed;
1518 }
1519 driver_suspended = true;
1520 } else {
1521 usbhid_mark_busy(usbhid);
1522 spin_unlock_irq(&usbhid->lock);
1523 return -EBUSY;
1524 }
1525
1526 } else {
1527 /* TODO: resume() might need to handle suspend failure */
1528 if (hid->driver && hid->driver->suspend)
1529 status = hid->driver->suspend(hid, message);
1530 driver_suspended = true;
1531 spin_lock_irq(&usbhid->lock);
1532 set_bit(HID_SUSPENDED, &usbhid->iofl);
1533 spin_unlock_irq(&usbhid->lock);
1534 if (usbhid_wait_io(hid) < 0)
1535 status = -EIO;
1536 }
1537
1538 hid_cancel_delayed_stuff(usbhid);
1539 hid_cease_io(usbhid);
1540
1541 if (PMSG_IS_AUTO(message) && test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) {
1542 /* lost race against keypresses */
1543 status = -EBUSY;
1544 goto failed;
1545 }
1546 dev_dbg(&intf->dev, "suspend\n");
1547 return status;
1548
1549 failed:
1550 hid_resume_common(hid, driver_suspended);
1551 return status;
1552 }
1553
1554 static int hid_resume(struct usb_interface *intf)
1555 {
1556 struct hid_device *hid = usb_get_intfdata (intf);
1557 struct usbhid_device *usbhid = hid->driver_data;
1558 int status;
1559
1560 if (!test_bit(HID_STARTED, &usbhid->iofl))
1561 return 0;
1562
1563 status = hid_resume_common(hid, true);
1564 dev_dbg(&intf->dev, "resume status %d\n", status);
1565 return 0;
1566 }
1567
1568 static int hid_reset_resume(struct usb_interface *intf)
1569 {
1570 struct hid_device *hid = usb_get_intfdata(intf);
1571 struct usbhid_device *usbhid = hid->driver_data;
1572 int status;
1573
1574 clear_bit(HID_SUSPENDED, &usbhid->iofl);
1575 status = hid_post_reset(intf);
1576 if (status >= 0 && hid->driver && hid->driver->reset_resume) {
1577 int ret = hid->driver->reset_resume(hid);
1578 if (ret < 0)
1579 status = ret;
1580 }
1581 return status;
1582 }
1583
1584 #endif /* CONFIG_PM */
1585
1586 static const struct usb_device_id hid_usb_ids[] = {
1587 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
1588 .bInterfaceClass = USB_INTERFACE_CLASS_HID },
1589 { } /* Terminating entry */
1590 };
1591
1592 MODULE_DEVICE_TABLE (usb, hid_usb_ids);
1593
1594 static struct usb_driver hid_driver = {
1595 .name = "usbhid",
1596 .probe = usbhid_probe,
1597 .disconnect = usbhid_disconnect,
1598 #ifdef CONFIG_PM
1599 .suspend = hid_suspend,
1600 .resume = hid_resume,
1601 .reset_resume = hid_reset_resume,
1602 #endif
1603 .pre_reset = hid_pre_reset,
1604 .post_reset = hid_post_reset,
1605 .id_table = hid_usb_ids,
1606 .supports_autosuspend = 1,
1607 };
1608
1609 struct usb_interface *usbhid_find_interface(int minor)
1610 {
1611 return usb_find_interface(&hid_driver, minor);
1612 }
1613
1614 static int __init hid_init(void)
1615 {
1616 int retval = -ENOMEM;
1617
1618 retval = usbhid_quirks_init(quirks_param);
1619 if (retval)
1620 goto usbhid_quirks_init_fail;
1621 retval = usb_register(&hid_driver);
1622 if (retval)
1623 goto usb_register_fail;
1624 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1625
1626 return 0;
1627 usb_register_fail:
1628 usbhid_quirks_exit();
1629 usbhid_quirks_init_fail:
1630 return retval;
1631 }
1632
1633 static void __exit hid_exit(void)
1634 {
1635 usb_deregister(&hid_driver);
1636 usbhid_quirks_exit();
1637 }
1638
1639 module_init(hid_init);
1640 module_exit(hid_exit);
1641
1642 MODULE_AUTHOR("Andreas Gal");
1643 MODULE_AUTHOR("Vojtech Pavlik");
1644 MODULE_AUTHOR("Jiri Kosina");
1645 MODULE_DESCRIPTION(DRIVER_DESC);
1646 MODULE_LICENSE(DRIVER_LICENSE);
Linux kernel - Deliverables
This page took 0.089973 seconds and 6 git commands to generate.