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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / hid / usbhid / hid-core.c
blob5bf91dbad59d4181bdf23fdeda7bd7327117933b
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
71 static void hid_io_error(struct hid_device *hid);
72 static int hid_submit_out(struct hid_device *hid);
73 static int hid_submit_ctrl(struct hid_device *hid);
74 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid);
75
76 /* Start up the input URB */
77 static int hid_start_in(struct hid_device *hid)
78 {
79 unsigned long flags;
80 int rc = 0;
81 struct usbhid_device *usbhid = hid->driver_data;
82
83 spin_lock_irqsave(&usbhid->lock, flags);
84 if (hid->open > 0 &&
85 !test_bit(HID_DISCONNECTED, &usbhid->iofl) &&
86 !test_bit(HID_REPORTED_IDLE, &usbhid->iofl) &&
87 !test_and_set_bit(HID_IN_RUNNING, &usbhid->iofl)) {
88 rc = usb_submit_urb(usbhid->urbin, GFP_ATOMIC);
89 if (rc != 0)
90 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
91 }
92 spin_unlock_irqrestore(&usbhid->lock, flags);
93 return rc;
94 }
95
96 /* I/O retry timer routine */
97 static void hid_retry_timeout(unsigned long _hid)
98 {
99 struct hid_device *hid = (struct hid_device *) _hid;
100 struct usbhid_device *usbhid = hid->driver_data;
101
102 dev_dbg(&usbhid->intf->dev, "retrying intr urb\n");
103 if (hid_start_in(hid))
104 hid_io_error(hid);
105 }
106
107 /* Workqueue routine to reset the device or clear a halt */
108 static void hid_reset(struct work_struct *work)
109 {
110 struct usbhid_device *usbhid =
111 container_of(work, struct usbhid_device, reset_work);
112 struct hid_device *hid = usbhid->hid;
113 int rc = 0;
114
115 if (test_bit(HID_CLEAR_HALT, &usbhid->iofl)) {
116 dev_dbg(&usbhid->intf->dev, "clear halt\n");
117 rc = usb_clear_halt(hid_to_usb_dev(hid), usbhid->urbin->pipe);
118 clear_bit(HID_CLEAR_HALT, &usbhid->iofl);
119 hid_start_in(hid);
120 }
121
122 else if (test_bit(HID_RESET_PENDING, &usbhid->iofl)) {
123 dev_dbg(&usbhid->intf->dev, "resetting device\n");
124 rc = usb_lock_device_for_reset(hid_to_usb_dev(hid), usbhid->intf);
125 if (rc == 0) {
126 rc = usb_reset_device(hid_to_usb_dev(hid));
127 usb_unlock_device(hid_to_usb_dev(hid));
128 }
129 clear_bit(HID_RESET_PENDING, &usbhid->iofl);
130 }
131
132 switch (rc) {
133 case 0:
134 if (!test_bit(HID_IN_RUNNING, &usbhid->iofl))
135 hid_io_error(hid);
136 break;
137 default:
138 hid_err(hid, "can't reset device, %s-%s/input%d, status %d\n",
139 hid_to_usb_dev(hid)->bus->bus_name,
140 hid_to_usb_dev(hid)->devpath,
141 usbhid->ifnum, rc);
142 /* FALLTHROUGH */
143 case -EHOSTUNREACH:
144 case -ENODEV:
145 case -EINTR:
146 break;
147 }
148 }
149
150 /* Main I/O error handler */
151 static void hid_io_error(struct hid_device *hid)
152 {
153 unsigned long flags;
154 struct usbhid_device *usbhid = hid->driver_data;
155
156 spin_lock_irqsave(&usbhid->lock, flags);
157
158 /* Stop when disconnected */
159 if (test_bit(HID_DISCONNECTED, &usbhid->iofl))
160 goto done;
161
162 /* If it has been a while since the last error, we'll assume
163 * this a brand new error and reset the retry timeout. */
164 if (time_after(jiffies, usbhid->stop_retry + HZ/2))
165 usbhid->retry_delay = 0;
166
167 /* When an error occurs, retry at increasing intervals */
168 if (usbhid->retry_delay == 0) {
169 usbhid->retry_delay = 13; /* Then 26, 52, 104, 104, ... */
170 usbhid->stop_retry = jiffies + msecs_to_jiffies(1000);
171 } else if (usbhid->retry_delay < 100)
172 usbhid->retry_delay *= 2;
173
174 if (time_after(jiffies, usbhid->stop_retry)) {
175
176 /* Retries failed, so do a port reset */
177 if (!test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) {
178 schedule_work(&usbhid->reset_work);
179 goto done;
180 }
181 }
182
183 mod_timer(&usbhid->io_retry,
184 jiffies + msecs_to_jiffies(usbhid->retry_delay));
185 done:
186 spin_unlock_irqrestore(&usbhid->lock, flags);
187 }
188
189 static void usbhid_mark_busy(struct usbhid_device *usbhid)
190 {
191 struct usb_interface *intf = usbhid->intf;
192
193 usb_mark_last_busy(interface_to_usbdev(intf));
194 }
195
196 static int usbhid_restart_out_queue(struct usbhid_device *usbhid)
197 {
198 struct hid_device *hid = usb_get_intfdata(usbhid->intf);
199 int kicked;
200 int r;
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
208 r = usb_autopm_get_interface_async(usbhid->intf);
209 if (r < 0)
210 return r;
211 /* Asynchronously flush queue. */
212 set_bit(HID_OUT_RUNNING, &usbhid->iofl);
213 if (hid_submit_out(hid)) {
214 clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
215 usb_autopm_put_interface_async(usbhid->intf);
216 }
217 wake_up(&usbhid->wait);
218 }
219 return kicked;
220 }
221
222 static int usbhid_restart_ctrl_queue(struct usbhid_device *usbhid)
223 {
224 struct hid_device *hid = usb_get_intfdata(usbhid->intf);
225 int kicked;
226 int r;
227
228 WARN_ON(hid == NULL);
229 if (!hid)
230 return 0;
231
232 if ((kicked = (usbhid->ctrlhead != usbhid->ctrltail))) {
233 dbg("Kicking head %d tail %d", usbhid->ctrlhead, usbhid->ctrltail);
234
235 r = usb_autopm_get_interface_async(usbhid->intf);
236 if (r < 0)
237 return r;
238 /* Asynchronously flush queue. */
239 set_bit(HID_CTRL_RUNNING, &usbhid->iofl);
240 if (hid_submit_ctrl(hid)) {
241 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
242 usb_autopm_put_interface_async(usbhid->intf);
243 }
244 wake_up(&usbhid->wait);
245 }
246 return kicked;
247 }
248
249 /*
250 * Input interrupt completion handler.
251 */
252
253 static void hid_irq_in(struct urb *urb)
254 {
255 struct hid_device *hid = urb->context;
256 struct usbhid_device *usbhid = hid->driver_data;
257 int status;
258
259 switch (urb->status) {
260 case 0: /* success */
261 usbhid_mark_busy(usbhid);
262 usbhid->retry_delay = 0;
263 hid_input_report(urb->context, HID_INPUT_REPORT,
264 urb->transfer_buffer,
265 urb->actual_length, 1);
266 /*
267 * autosuspend refused while keys are pressed
268 * because most keyboards don't wake up when
269 * a key is released
270 */
271 if (hid_check_keys_pressed(hid))
272 set_bit(HID_KEYS_PRESSED, &usbhid->iofl);
273 else
274 clear_bit(HID_KEYS_PRESSED, &usbhid->iofl);
275 break;
276 case -EPIPE: /* stall */
277 usbhid_mark_busy(usbhid);
278 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
279 set_bit(HID_CLEAR_HALT, &usbhid->iofl);
280 schedule_work(&usbhid->reset_work);
281 return;
282 case -ECONNRESET: /* unlink */
283 case -ENOENT:
284 case -ESHUTDOWN: /* unplug */
285 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
286 return;
287 case -EILSEQ: /* protocol error or unplug */
288 case -EPROTO: /* protocol error or unplug */
289 case -ETIME: /* protocol error or unplug */
290 case -ETIMEDOUT: /* Should never happen, but... */
291 usbhid_mark_busy(usbhid);
292 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
293 hid_io_error(hid);
294 return;
295 default: /* error */
296 hid_warn(urb->dev, "input irq status %d received\n",
297 urb->status);
298 }
299
300 status = usb_submit_urb(urb, GFP_ATOMIC);
301 if (status) {
302 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
303 if (status != -EPERM) {
304 hid_err(hid, "can't resubmit intr, %s-%s/input%d, status %d\n",
305 hid_to_usb_dev(hid)->bus->bus_name,
306 hid_to_usb_dev(hid)->devpath,
307 usbhid->ifnum, status);
308 hid_io_error(hid);
309 }
310 }
311 }
312
313 static int hid_submit_out(struct hid_device *hid)
314 {
315 struct hid_report *report;
316 char *raw_report;
317 struct usbhid_device *usbhid = hid->driver_data;
318 int r;
319
320 report = usbhid->out[usbhid->outtail].report;
321 raw_report = usbhid->out[usbhid->outtail].raw_report;
322
323 usbhid->urbout->transfer_buffer_length = ((report->size - 1) >> 3) +
324 1 + (report->id > 0);
325 usbhid->urbout->dev = hid_to_usb_dev(hid);
326 memcpy(usbhid->outbuf, raw_report,
327 usbhid->urbout->transfer_buffer_length);
328 kfree(raw_report);
329
330 dbg_hid("submitting out urb\n");
331
332 r = usb_submit_urb(usbhid->urbout, GFP_ATOMIC);
333 if (r < 0) {
334 hid_err(hid, "usb_submit_urb(out) failed: %d\n", r);
335 return r;
336 }
337 usbhid->last_out = jiffies;
338 return 0;
339 }
340
341 static int hid_submit_ctrl(struct hid_device *hid)
342 {
343 struct hid_report *report;
344 unsigned char dir;
345 char *raw_report;
346 int len, r;
347 struct usbhid_device *usbhid = hid->driver_data;
348
349 report = usbhid->ctrl[usbhid->ctrltail].report;
350 raw_report = usbhid->ctrl[usbhid->ctrltail].raw_report;
351 dir = usbhid->ctrl[usbhid->ctrltail].dir;
352
353 len = ((report->size - 1) >> 3) + 1 + (report->id > 0);
354 if (dir == USB_DIR_OUT) {
355 usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);
356 usbhid->urbctrl->transfer_buffer_length = len;
357 memcpy(usbhid->ctrlbuf, raw_report, len);
358 kfree(raw_report);
359 } else {
360 int maxpacket, padlen;
361
362 usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0);
363 maxpacket = usb_maxpacket(hid_to_usb_dev(hid),
364 usbhid->urbctrl->pipe, 0);
365 if (maxpacket > 0) {
366 padlen = DIV_ROUND_UP(len, maxpacket);
367 padlen *= maxpacket;
368 if (padlen > usbhid->bufsize)
369 padlen = usbhid->bufsize;
370 } else
371 padlen = 0;
372 usbhid->urbctrl->transfer_buffer_length = padlen;
373 }
374 usbhid->urbctrl->dev = hid_to_usb_dev(hid);
375
376 usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir;
377 usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT :
378 HID_REQ_GET_REPORT;
379 usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) |
380 report->id);
381 usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum);
382 usbhid->cr->wLength = cpu_to_le16(len);
383
384 dbg_hid("submitting ctrl urb: %s wValue=0x%04x wIndex=0x%04x wLength=%u\n",
385 usbhid->cr->bRequest == HID_REQ_SET_REPORT ? "Set_Report" :
386 "Get_Report",
387 usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength);
388
389 r = usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC);
390 if (r < 0) {
391 hid_err(hid, "usb_submit_urb(ctrl) failed: %d\n", r);
392 return r;
393 }
394 usbhid->last_ctrl = jiffies;
395 return 0;
396 }
397
398 /*
399 * Output interrupt completion handler.
400 */
401
402 static void hid_irq_out(struct urb *urb)
403 {
404 struct hid_device *hid = urb->context;
405 struct usbhid_device *usbhid = hid->driver_data;
406 unsigned long flags;
407 int unplug = 0;
408
409 switch (urb->status) {
410 case 0: /* success */
411 break;
412 case -ESHUTDOWN: /* unplug */
413 unplug = 1;
414 case -EILSEQ: /* protocol error or unplug */
415 case -EPROTO: /* protocol error or unplug */
416 case -ECONNRESET: /* unlink */
417 case -ENOENT:
418 break;
419 default: /* error */
420 hid_warn(urb->dev, "output irq status %d received\n",
421 urb->status);
422 }
423
424 spin_lock_irqsave(&usbhid->lock, flags);
425
426 if (unplug)
427 usbhid->outtail = usbhid->outhead;
428 else
429 usbhid->outtail = (usbhid->outtail + 1) & (HID_OUTPUT_FIFO_SIZE - 1);
430
431 if (usbhid->outhead != usbhid->outtail && !hid_submit_out(hid)) {
432 /* Successfully submitted next urb in queue */
433 spin_unlock_irqrestore(&usbhid->lock, flags);
434 return;
435 }
436
437 clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
438 spin_unlock_irqrestore(&usbhid->lock, flags);
439 usb_autopm_put_interface_async(usbhid->intf);
440 wake_up(&usbhid->wait);
441 }
442
443 /*
444 * Control pipe completion handler.
445 */
446
447 static void hid_ctrl(struct urb *urb)
448 {
449 struct hid_device *hid = urb->context;
450 struct usbhid_device *usbhid = hid->driver_data;
451 int unplug = 0, status = urb->status;
452
453 spin_lock(&usbhid->lock);
454
455 switch (status) {
456 case 0: /* success */
457 if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_IN)
458 hid_input_report(urb->context,
459 usbhid->ctrl[usbhid->ctrltail].report->type,
460 urb->transfer_buffer, urb->actual_length, 0);
461 break;
462 case -ESHUTDOWN: /* unplug */
463 unplug = 1;
464 case -EILSEQ: /* protocol error or unplug */
465 case -EPROTO: /* protocol error or unplug */
466 case -ECONNRESET: /* unlink */
467 case -ENOENT:
468 case -EPIPE: /* report not available */
469 break;
470 default: /* error */
471 hid_warn(urb->dev, "ctrl urb status %d received\n", status);
472 }
473
474 if (unplug)
475 usbhid->ctrltail = usbhid->ctrlhead;
476 else
477 usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1);
478
479 if (usbhid->ctrlhead != usbhid->ctrltail && !hid_submit_ctrl(hid)) {
480 /* Successfully submitted next urb in queue */
481 spin_unlock(&usbhid->lock);
482 return;
483 }
484
485 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
486 spin_unlock(&usbhid->lock);
487 usb_autopm_put_interface_async(usbhid->intf);
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 /* Try to awake from autosuspend... */
517 if (usb_autopm_get_interface_async(usbhid->intf) < 0)
518 return;
519
520 /*
521 * But if still suspended, leave urb enqueued, don't submit.
522 * Submission will occur if/when resume() drains the queue.
523 */
524 if (test_bit(HID_REPORTED_IDLE, &usbhid->iofl))
525 return;
526
527 if (!test_and_set_bit(HID_OUT_RUNNING, &usbhid->iofl)) {
528 if (hid_submit_out(hid)) {
529 clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
530 usb_autopm_put_interface_async(usbhid->intf);
531 }
532 wake_up(&usbhid->wait);
533 } else {
534 /*
535 * the queue is known to run
536 * but an earlier request may be stuck
537 * we may need to time out
538 * no race because this is called under
539 * spinlock
540 */
541 if (time_after(jiffies, usbhid->last_out + HZ * 5))
542 usb_unlink_urb(usbhid->urbout);
543 }
544 return;
545 }
546
547 if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) {
548 hid_warn(hid, "control queue full\n");
549 return;
550 }
551
552 if (dir == USB_DIR_OUT) {
553 usbhid->ctrl[usbhid->ctrlhead].raw_report = kmalloc(len, GFP_ATOMIC);
554 if (!usbhid->ctrl[usbhid->ctrlhead].raw_report) {
555 hid_warn(hid, "control queueing failed\n");
556 return;
557 }
558 hid_output_report(report, usbhid->ctrl[usbhid->ctrlhead].raw_report);
559 }
560 usbhid->ctrl[usbhid->ctrlhead].report = report;
561 usbhid->ctrl[usbhid->ctrlhead].dir = dir;
562 usbhid->ctrlhead = head;
563
564 /* Try to awake from autosuspend... */
565 if (usb_autopm_get_interface_async(usbhid->intf) < 0)
566 return;
567
568 /*
569 * If already suspended, leave urb enqueued, but don't submit.
570 * Submission will occur if/when resume() drains the queue.
571 */
572 if (test_bit(HID_REPORTED_IDLE, &usbhid->iofl))
573 return;
574
575 if (!test_and_set_bit(HID_CTRL_RUNNING, &usbhid->iofl)) {
576 if (hid_submit_ctrl(hid)) {
577 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
578 usb_autopm_put_interface_async(usbhid->intf);
579 }
580 wake_up(&usbhid->wait);
581 } else {
582 /*
583 * the queue is known to run
584 * but an earlier request may be stuck
585 * we may need to time out
586 * no race because this is called under
587 * spinlock
588 */
589 if (time_after(jiffies, usbhid->last_ctrl + HZ * 5))
590 usb_unlink_urb(usbhid->urbctrl);
591 }
592 }
593
594 void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
595 {
596 struct usbhid_device *usbhid = hid->driver_data;
597 unsigned long flags;
598
599 spin_lock_irqsave(&usbhid->lock, flags);
600 __usbhid_submit_report(hid, report, dir);
601 spin_unlock_irqrestore(&usbhid->lock, flags);
602 }
603 EXPORT_SYMBOL_GPL(usbhid_submit_report);
604
605 /* Workqueue routine to send requests to change LEDs */
606 static void hid_led(struct work_struct *work)
607 {
608 struct usbhid_device *usbhid =
609 container_of(work, struct usbhid_device, led_work);
610 struct hid_device *hid = usbhid->hid;
611 struct hid_field *field;
612 unsigned long flags;
613
614 field = hidinput_get_led_field(hid);
615 if (!field) {
616 hid_warn(hid, "LED event field not found\n");
617 return;
618 }
619
620 spin_lock_irqsave(&usbhid->lock, flags);
621 if (!test_bit(HID_DISCONNECTED, &usbhid->iofl)) {
622 usbhid->ledcount = hidinput_count_leds(hid);
623 hid_dbg(usbhid->hid, "New ledcount = %u\n", usbhid->ledcount);
624 __usbhid_submit_report(hid, field->report, USB_DIR_OUT);
625 }
626 spin_unlock_irqrestore(&usbhid->lock, flags);
627 }
628
629 static int usb_hidinput_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
630 {
631 struct hid_device *hid = input_get_drvdata(dev);
632 struct usbhid_device *usbhid = hid->driver_data;
633 struct hid_field *field;
634 unsigned long flags;
635 int offset;
636
637 if (type == EV_FF)
638 return input_ff_event(dev, type, code, value);
639
640 if (type != EV_LED)
641 return -1;
642
643 if ((offset = hidinput_find_field(hid, type, code, &field)) == -1) {
644 hid_warn(dev, "event field not found\n");
645 return -1;
646 }
647
648 spin_lock_irqsave(&usbhid->lock, flags);
649 hid_set_field(field, offset, value);
650 spin_unlock_irqrestore(&usbhid->lock, flags);
651
652 /*
653 * Defer performing requested LED action.
654 * This is more likely gather all LED changes into a single URB.
655 */
656 schedule_work(&usbhid->led_work);
657
658 return 0;
659 }
660
661 int usbhid_wait_io(struct hid_device *hid)
662 {
663 struct usbhid_device *usbhid = hid->driver_data;
664
665 if (!wait_event_timeout(usbhid->wait,
666 (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl) &&
667 !test_bit(HID_OUT_RUNNING, &usbhid->iofl)),
668 10*HZ)) {
669 dbg_hid("timeout waiting for ctrl or out queue to clear\n");
670 return -1;
671 }
672
673 return 0;
674 }
675 EXPORT_SYMBOL_GPL(usbhid_wait_io);
676
677 static int hid_set_idle(struct usb_device *dev, int ifnum, int report, int idle)
678 {
679 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
680 HID_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE, (idle << 8) | report,
681 ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT);
682 }
683
684 static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
685 unsigned char type, void *buf, int size)
686 {
687 int result, retries = 4;
688
689 memset(buf, 0, size);
690
691 do {
692 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
693 USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
694 (type << 8), ifnum, buf, size, USB_CTRL_GET_TIMEOUT);
695 retries--;
696 } while (result < size && retries);
697 return result;
698 }
699
700 int usbhid_open(struct hid_device *hid)
701 {
702 struct usbhid_device *usbhid = hid->driver_data;
703 int res;
704
705 mutex_lock(&hid_open_mut);
706 if (!hid->open++) {
707 res = usb_autopm_get_interface(usbhid->intf);
708 /* the device must be awake to reliably request remote wakeup */
709 if (res < 0) {
710 hid->open--;
711 mutex_unlock(&hid_open_mut);
712 return -EIO;
713 }
714 usbhid->intf->needs_remote_wakeup = 1;
715 if (hid_start_in(hid))
716 hid_io_error(hid);
717
718 usb_autopm_put_interface(usbhid->intf);
719 }
720 mutex_unlock(&hid_open_mut);
721 return 0;
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 int err, ret;
755
756 list_for_each_entry(report, &hid->report_enum[HID_INPUT_REPORT].report_list, list)
757 usbhid_submit_report(hid, report, USB_DIR_IN);
758
759 list_for_each_entry(report, &hid->report_enum[HID_FEATURE_REPORT].report_list, list)
760 usbhid_submit_report(hid, report, USB_DIR_IN);
761
762 err = 0;
763 ret = usbhid_wait_io(hid);
764 while (ret) {
765 err |= ret;
766 if (test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
767 usb_kill_urb(usbhid->urbctrl);
768 if (test_bit(HID_OUT_RUNNING, &usbhid->iofl))
769 usb_kill_urb(usbhid->urbout);
770 ret = usbhid_wait_io(hid);
771 }
772
773 if (err)
774 hid_warn(hid, "timeout initializing reports\n");
775 }
776
777 /*
778 * Reset LEDs which BIOS might have left on. For now, just NumLock (0x01).
779 */
780 static int hid_find_field_early(struct hid_device *hid, unsigned int page,
781 unsigned int hid_code, struct hid_field **pfield)
782 {
783 struct hid_report *report;
784 struct hid_field *field;
785 struct hid_usage *usage;
786 int i, j;
787
788 list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) {
789 for (i = 0; i < report->maxfield; i++) {
790 field = report->field[i];
791 for (j = 0; j < field->maxusage; j++) {
792 usage = &field->usage[j];
793 if ((usage->hid & HID_USAGE_PAGE) == page &&
794 (usage->hid & 0xFFFF) == hid_code) {
795 *pfield = field;
796 return j;
797 }
798 }
799 }
800 }
801 return -1;
802 }
803
804 void usbhid_set_leds(struct hid_device *hid)
805 {
806 struct hid_field *field;
807 int offset;
808
809 if ((offset = hid_find_field_early(hid, HID_UP_LED, 0x01, &field)) != -1) {
810 hid_set_field(field, offset, 0);
811 usbhid_submit_report(hid, field->report, USB_DIR_OUT);
812 }
813 }
814 EXPORT_SYMBOL_GPL(usbhid_set_leds);
815
816 /*
817 * Traverse the supplied list of reports and find the longest
818 */
819 static void hid_find_max_report(struct hid_device *hid, unsigned int type,
820 unsigned int *max)
821 {
822 struct hid_report *report;
823 unsigned int size;
824
825 list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
826 size = ((report->size - 1) >> 3) + 1 + hid->report_enum[type].numbered;
827 if (*max < size)
828 *max = size;
829 }
830 }
831
832 static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid)
833 {
834 struct usbhid_device *usbhid = hid->driver_data;
835
836 usbhid->inbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
837 &usbhid->inbuf_dma);
838 usbhid->outbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
839 &usbhid->outbuf_dma);
840 usbhid->cr = kmalloc(sizeof(*usbhid->cr), GFP_KERNEL);
841 usbhid->ctrlbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
842 &usbhid->ctrlbuf_dma);
843 if (!usbhid->inbuf || !usbhid->outbuf || !usbhid->cr ||
844 !usbhid->ctrlbuf)
845 return -1;
846
847 return 0;
848 }
849
850 static int usbhid_get_raw_report(struct hid_device *hid,
851 unsigned char report_number, __u8 *buf, size_t count,
852 unsigned char report_type)
853 {
854 struct usbhid_device *usbhid = hid->driver_data;
855 struct usb_device *dev = hid_to_usb_dev(hid);
856 struct usb_interface *intf = usbhid->intf;
857 struct usb_host_interface *interface = intf->cur_altsetting;
858 int skipped_report_id = 0;
859 int ret;
860
861 /* Byte 0 is the report number. Report data starts at byte 1.*/
862 buf[0] = report_number;
863 if (report_number == 0x0) {
864 /* Offset the return buffer by 1, so that the report ID
865 will remain in byte 0. */
866 buf++;
867 count--;
868 skipped_report_id = 1;
869 }
870 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
871 HID_REQ_GET_REPORT,
872 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
873 ((report_type + 1) << 8) | report_number,
874 interface->desc.bInterfaceNumber, buf, count,
875 USB_CTRL_SET_TIMEOUT);
876
877 /* count also the report id */
878 if (ret > 0 && skipped_report_id)
879 ret++;
880
881 return ret;
882 }
883
884 static int usbhid_output_raw_report(struct hid_device *hid, __u8 *buf, size_t count,
885 unsigned char report_type)
886 {
887 struct usbhid_device *usbhid = hid->driver_data;
888 struct usb_device *dev = hid_to_usb_dev(hid);
889 struct usb_interface *intf = usbhid->intf;
890 struct usb_host_interface *interface = intf->cur_altsetting;
891 int ret;
892
893 if (usbhid->urbout && report_type != HID_FEATURE_REPORT) {
894 int actual_length;
895 int skipped_report_id = 0;
896
897 if (buf[0] == 0x0) {
898 /* Don't send the Report ID */
899 buf++;
900 count--;
901 skipped_report_id = 1;
902 }
903 ret = usb_interrupt_msg(dev, usbhid->urbout->pipe,
904 buf, count, &actual_length,
905 USB_CTRL_SET_TIMEOUT);
906 /* return the number of bytes transferred */
907 if (ret == 0) {
908 ret = actual_length;
909 /* count also the report id */
910 if (skipped_report_id)
911 ret++;
912 }
913 } else {
914 int skipped_report_id = 0;
915 int report_id = buf[0];
916 if (buf[0] == 0x0) {
917 /* Don't send the Report ID */
918 buf++;
919 count--;
920 skipped_report_id = 1;
921 }
922 ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
923 HID_REQ_SET_REPORT,
924 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
925 ((report_type + 1) << 8) | report_id,
926 interface->desc.bInterfaceNumber, buf, count,
927 USB_CTRL_SET_TIMEOUT);
928 /* count also the report id, if this was a numbered report. */
929 if (ret > 0 && skipped_report_id)
930 ret++;
931 }
932
933 return ret;
934 }
935
936 static void usbhid_restart_queues(struct usbhid_device *usbhid)
937 {
938 if (usbhid->urbout)
939 usbhid_restart_out_queue(usbhid);
940 usbhid_restart_ctrl_queue(usbhid);
941 }
942
943 static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid)
944 {
945 struct usbhid_device *usbhid = hid->driver_data;
946
947 usb_free_coherent(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma);
948 usb_free_coherent(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma);
949 kfree(usbhid->cr);
950 usb_free_coherent(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma);
951 }
952
953 static int usbhid_parse(struct hid_device *hid)
954 {
955 struct usb_interface *intf = to_usb_interface(hid->dev.parent);
956 struct usb_host_interface *interface = intf->cur_altsetting;
957 struct usb_device *dev = interface_to_usbdev (intf);
958 struct hid_descriptor *hdesc;
959 u32 quirks = 0;
960 unsigned int rsize = 0;
961 char *rdesc;
962 int ret, n;
963
964 quirks = usbhid_lookup_quirk(le16_to_cpu(dev->descriptor.idVendor),
965 le16_to_cpu(dev->descriptor.idProduct));
966
967 if (quirks & HID_QUIRK_IGNORE)
968 return -ENODEV;
969
970 /* Many keyboards and mice don't like to be polled for reports,
971 * so we will always set the HID_QUIRK_NOGET flag for them. */
972 if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) {
973 if (interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_KEYBOARD ||
974 interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE)
975 quirks |= HID_QUIRK_NOGET;
976 }
977
978 if (usb_get_extra_descriptor(interface, HID_DT_HID, &hdesc) &&
979 (!interface->desc.bNumEndpoints ||
980 usb_get_extra_descriptor(&interface->endpoint[0], HID_DT_HID, &hdesc))) {
981 dbg_hid("class descriptor not present\n");
982 return -ENODEV;
983 }
984
985 hid->version = le16_to_cpu(hdesc->bcdHID);
986 hid->country = hdesc->bCountryCode;
987
988 for (n = 0; n < hdesc->bNumDescriptors; n++)
989 if (hdesc->desc[n].bDescriptorType == HID_DT_REPORT)
990 rsize = le16_to_cpu(hdesc->desc[n].wDescriptorLength);
991
992 if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
993 dbg_hid("weird size of report descriptor (%u)\n", rsize);
994 return -EINVAL;
995 }
996
997 if (!(rdesc = kmalloc(rsize, GFP_KERNEL))) {
998 dbg_hid("couldn't allocate rdesc memory\n");
999 return -ENOMEM;
1000 }
1001
1002 hid_set_idle(dev, interface->desc.bInterfaceNumber, 0, 0);
1003
1004 ret = hid_get_class_descriptor(dev, interface->desc.bInterfaceNumber,
1005 HID_DT_REPORT, rdesc, rsize);
1006 if (ret < 0) {
1007 dbg_hid("reading report descriptor failed\n");
1008 kfree(rdesc);
1009 goto err;
1010 }
1011
1012 ret = hid_parse_report(hid, rdesc, rsize);
1013 kfree(rdesc);
1014 if (ret) {
1015 dbg_hid("parsing report descriptor failed\n");
1016 goto err;
1017 }
1018
1019 hid->quirks |= quirks;
1020
1021 return 0;
1022 err:
1023 return ret;
1024 }
1025
1026 static int usbhid_start(struct hid_device *hid)
1027 {
1028 struct usb_interface *intf = to_usb_interface(hid->dev.parent);
1029 struct usb_host_interface *interface = intf->cur_altsetting;
1030 struct usb_device *dev = interface_to_usbdev(intf);
1031 struct usbhid_device *usbhid = hid->driver_data;
1032 unsigned int n, insize = 0;
1033 int ret;
1034
1035 clear_bit(HID_DISCONNECTED, &usbhid->iofl);
1036
1037 usbhid->bufsize = HID_MIN_BUFFER_SIZE;
1038 hid_find_max_report(hid, HID_INPUT_REPORT, &usbhid->bufsize);
1039 hid_find_max_report(hid, HID_OUTPUT_REPORT, &usbhid->bufsize);
1040 hid_find_max_report(hid, HID_FEATURE_REPORT, &usbhid->bufsize);
1041
1042 if (usbhid->bufsize > HID_MAX_BUFFER_SIZE)
1043 usbhid->bufsize = HID_MAX_BUFFER_SIZE;
1044
1045 hid_find_max_report(hid, HID_INPUT_REPORT, &insize);
1046
1047 if (insize > HID_MAX_BUFFER_SIZE)
1048 insize = HID_MAX_BUFFER_SIZE;
1049
1050 if (hid_alloc_buffers(dev, hid)) {
1051 ret = -ENOMEM;
1052 goto fail;
1053 }
1054
1055 for (n = 0; n < interface->desc.bNumEndpoints; n++) {
1056 struct usb_endpoint_descriptor *endpoint;
1057 int pipe;
1058 int interval;
1059
1060 endpoint = &interface->endpoint[n].desc;
1061 if (!usb_endpoint_xfer_int(endpoint))
1062 continue;
1063
1064 interval = endpoint->bInterval;
1065
1066 /* Some vendors give fullspeed interval on highspeed devides */
1067 if (hid->quirks & HID_QUIRK_FULLSPEED_INTERVAL &&
1068 dev->speed == USB_SPEED_HIGH) {
1069 interval = fls(endpoint->bInterval*8);
1070 printk(KERN_INFO "%s: Fixing fullspeed to highspeed interval: %d -> %d\n",
1071 hid->name, endpoint->bInterval, interval);
1072 }
1073
1074 /* Change the polling interval of mice. */
1075 if (hid->collection->usage == HID_GD_MOUSE && hid_mousepoll_interval > 0)
1076 interval = hid_mousepoll_interval;
1077
1078 ret = -ENOMEM;
1079 if (usb_endpoint_dir_in(endpoint)) {
1080 if (usbhid->urbin)
1081 continue;
1082 if (!(usbhid->urbin = usb_alloc_urb(0, GFP_KERNEL)))
1083 goto fail;
1084 pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
1085 usb_fill_int_urb(usbhid->urbin, dev, pipe, usbhid->inbuf, insize,
1086 hid_irq_in, hid, interval);
1087 usbhid->urbin->transfer_dma = usbhid->inbuf_dma;
1088 usbhid->urbin->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1089 } else {
1090 if (usbhid->urbout)
1091 continue;
1092 if (!(usbhid->urbout = usb_alloc_urb(0, GFP_KERNEL)))
1093 goto fail;
1094 pipe = usb_sndintpipe(dev, endpoint->bEndpointAddress);
1095 usb_fill_int_urb(usbhid->urbout, dev, pipe, usbhid->outbuf, 0,
1096 hid_irq_out, hid, interval);
1097 usbhid->urbout->transfer_dma = usbhid->outbuf_dma;
1098 usbhid->urbout->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1099 }
1100 }
1101
1102 usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL);
1103 if (!usbhid->urbctrl) {
1104 ret = -ENOMEM;
1105 goto fail;
1106 }
1107
1108 usb_fill_control_urb(usbhid->urbctrl, dev, 0, (void *) usbhid->cr,
1109 usbhid->ctrlbuf, 1, hid_ctrl, hid);
1110 usbhid->urbctrl->transfer_dma = usbhid->ctrlbuf_dma;
1111 usbhid->urbctrl->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1112
1113 if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS))
1114 usbhid_init_reports(hid);
1115
1116 set_bit(HID_STARTED, &usbhid->iofl);
1117
1118 /* Some keyboards don't work until their LEDs have been set.
1119 * Since BIOSes do set the LEDs, it must be safe for any device
1120 * that supports the keyboard boot protocol.
1121 * In addition, enable remote wakeup by default for all keyboard
1122 * devices supporting the boot protocol.
1123 */
1124 if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT &&
1125 interface->desc.bInterfaceProtocol ==
1126 USB_INTERFACE_PROTOCOL_KEYBOARD) {
1127 usbhid_set_leds(hid);
1128 device_set_wakeup_enable(&dev->dev, 1);
1129 }
1130 return 0;
1131
1132 fail:
1133 usb_free_urb(usbhid->urbin);
1134 usb_free_urb(usbhid->urbout);
1135 usb_free_urb(usbhid->urbctrl);
1136 usbhid->urbin = NULL;
1137 usbhid->urbout = NULL;
1138 usbhid->urbctrl = NULL;
1139 hid_free_buffers(dev, hid);
1140 return ret;
1141 }
1142
1143 static void usbhid_stop(struct hid_device *hid)
1144 {
1145 struct usbhid_device *usbhid = hid->driver_data;
1146
1147 if (WARN_ON(!usbhid))
1148 return;
1149
1150 clear_bit(HID_STARTED, &usbhid->iofl);
1151 spin_lock_irq(&usbhid->lock); /* Sync with error and led handlers */
1152 set_bit(HID_DISCONNECTED, &usbhid->iofl);
1153 spin_unlock_irq(&usbhid->lock);
1154 usb_kill_urb(usbhid->urbin);
1155 usb_kill_urb(usbhid->urbout);
1156 usb_kill_urb(usbhid->urbctrl);
1157
1158 hid_cancel_delayed_stuff(usbhid);
1159
1160 hid->claimed = 0;
1161
1162 usb_free_urb(usbhid->urbin);
1163 usb_free_urb(usbhid->urbctrl);
1164 usb_free_urb(usbhid->urbout);
1165 usbhid->urbin = NULL; /* don't mess up next start */
1166 usbhid->urbctrl = NULL;
1167 usbhid->urbout = NULL;
1168
1169 hid_free_buffers(hid_to_usb_dev(hid), hid);
1170 }
1171
1172 static int usbhid_power(struct hid_device *hid, int lvl)
1173 {
1174 int r = 0;
1175
1176 switch (lvl) {
1177 case PM_HINT_FULLON:
1178 r = usbhid_get_power(hid);
1179 break;
1180 case PM_HINT_NORMAL:
1181 usbhid_put_power(hid);
1182 break;
1183 }
1184 return r;
1185 }
1186
1187 static struct hid_ll_driver usb_hid_driver = {
1188 .parse = usbhid_parse,
1189 .start = usbhid_start,
1190 .stop = usbhid_stop,
1191 .open = usbhid_open,
1192 .close = usbhid_close,
1193 .power = usbhid_power,
1194 .hidinput_input_event = usb_hidinput_input_event,
1195 };
1196
1197 static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *id)
1198 {
1199 struct usb_host_interface *interface = intf->cur_altsetting;
1200 struct usb_device *dev = interface_to_usbdev(intf);
1201 struct usbhid_device *usbhid;
1202 struct hid_device *hid;
1203 unsigned int n, has_in = 0;
1204 size_t len;
1205 int ret;
1206
1207 dbg_hid("HID probe called for ifnum %d\n",
1208 intf->altsetting->desc.bInterfaceNumber);
1209
1210 for (n = 0; n < interface->desc.bNumEndpoints; n++)
1211 if (usb_endpoint_is_int_in(&interface->endpoint[n].desc))
1212 has_in++;
1213 if (!has_in) {
1214 hid_err(intf, "couldn't find an input interrupt endpoint\n");
1215 return -ENODEV;
1216 }
1217
1218 hid = hid_allocate_device();
1219 if (IS_ERR(hid))
1220 return PTR_ERR(hid);
1221
1222 usb_set_intfdata(intf, hid);
1223 hid->ll_driver = &usb_hid_driver;
1224 hid->hid_get_raw_report = usbhid_get_raw_report;
1225 hid->hid_output_raw_report = usbhid_output_raw_report;
1226 hid->ff_init = hid_pidff_init;
1227 #ifdef CONFIG_USB_HIDDEV
1228 hid->hiddev_connect = hiddev_connect;
1229 hid->hiddev_disconnect = hiddev_disconnect;
1230 hid->hiddev_hid_event = hiddev_hid_event;
1231 hid->hiddev_report_event = hiddev_report_event;
1232 #endif
1233 hid->dev.parent = &intf->dev;
1234 hid->bus = BUS_USB;
1235 hid->vendor = le16_to_cpu(dev->descriptor.idVendor);
1236 hid->product = le16_to_cpu(dev->descriptor.idProduct);
1237 hid->name[0] = 0;
1238 hid->quirks = usbhid_lookup_quirk(hid->vendor, hid->product);
1239 if (intf->cur_altsetting->desc.bInterfaceProtocol ==
1240 USB_INTERFACE_PROTOCOL_MOUSE)
1241 hid->type = HID_TYPE_USBMOUSE;
1242 else if (intf->cur_altsetting->desc.bInterfaceProtocol == 0)
1243 hid->type = HID_TYPE_USBNONE;
1244
1245 if (dev->manufacturer)
1246 strlcpy(hid->name, dev->manufacturer, sizeof(hid->name));
1247
1248 if (dev->product) {
1249 if (dev->manufacturer)
1250 strlcat(hid->name, " ", sizeof(hid->name));
1251 strlcat(hid->name, dev->product, sizeof(hid->name));
1252 }
1253
1254 if (!strlen(hid->name))
1255 snprintf(hid->name, sizeof(hid->name), "HID %04x:%04x",
1256 le16_to_cpu(dev->descriptor.idVendor),
1257 le16_to_cpu(dev->descriptor.idProduct));
1258
1259 usb_make_path(dev, hid->phys, sizeof(hid->phys));
1260 strlcat(hid->phys, "/input", sizeof(hid->phys));
1261 len = strlen(hid->phys);
1262 if (len < sizeof(hid->phys) - 1)
1263 snprintf(hid->phys + len, sizeof(hid->phys) - len,
1264 "%d", intf->altsetting[0].desc.bInterfaceNumber);
1265
1266 if (usb_string(dev, dev->descriptor.iSerialNumber, hid->uniq, 64) <= 0)
1267 hid->uniq[0] = 0;
1268
1269 usbhid = kzalloc(sizeof(*usbhid), GFP_KERNEL);
1270 if (usbhid == NULL) {
1271 ret = -ENOMEM;
1272 goto err;
1273 }
1274
1275 hid->driver_data = usbhid;
1276 usbhid->hid = hid;
1277 usbhid->intf = intf;
1278 usbhid->ifnum = interface->desc.bInterfaceNumber;
1279
1280 init_waitqueue_head(&usbhid->wait);
1281 INIT_WORK(&usbhid->reset_work, hid_reset);
1282 setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);
1283 spin_lock_init(&usbhid->lock);
1284
1285 INIT_WORK(&usbhid->led_work, hid_led);
1286
1287 ret = hid_add_device(hid);
1288 if (ret) {
1289 if (ret != -ENODEV)
1290 hid_err(intf, "can't add hid device: %d\n", ret);
1291 goto err_free;
1292 }
1293
1294 return 0;
1295 err_free:
1296 kfree(usbhid);
1297 err:
1298 hid_destroy_device(hid);
1299 return ret;
1300 }
1301
1302 static void usbhid_disconnect(struct usb_interface *intf)
1303 {
1304 struct hid_device *hid = usb_get_intfdata(intf);
1305 struct usbhid_device *usbhid;
1306
1307 if (WARN_ON(!hid))
1308 return;
1309
1310 usbhid = hid->driver_data;
1311 hid_destroy_device(hid);
1312 kfree(usbhid);
1313 }
1314
1315 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid)
1316 {
1317 del_timer_sync(&usbhid->io_retry);
1318 cancel_work_sync(&usbhid->reset_work);
1319 cancel_work_sync(&usbhid->led_work);
1320 }
1321
1322 static void hid_cease_io(struct usbhid_device *usbhid)
1323 {
1324 del_timer_sync(&usbhid->io_retry);
1325 usb_kill_urb(usbhid->urbin);
1326 usb_kill_urb(usbhid->urbctrl);
1327 usb_kill_urb(usbhid->urbout);
1328 }
1329
1330 /* Treat USB reset pretty much the same as suspend/resume */
1331 static int hid_pre_reset(struct usb_interface *intf)
1332 {
1333 struct hid_device *hid = usb_get_intfdata(intf);
1334 struct usbhid_device *usbhid = hid->driver_data;
1335
1336 spin_lock_irq(&usbhid->lock);
1337 set_bit(HID_RESET_PENDING, &usbhid->iofl);
1338 spin_unlock_irq(&usbhid->lock);
1339 hid_cease_io(usbhid);
1340
1341 return 0;
1342 }
1343
1344 /* Same routine used for post_reset and reset_resume */
1345 static int hid_post_reset(struct usb_interface *intf)
1346 {
1347 struct usb_device *dev = interface_to_usbdev (intf);
1348 struct hid_device *hid = usb_get_intfdata(intf);
1349 struct usbhid_device *usbhid = hid->driver_data;
1350 int status;
1351
1352 spin_lock_irq(&usbhid->lock);
1353 clear_bit(HID_RESET_PENDING, &usbhid->iofl);
1354 spin_unlock_irq(&usbhid->lock);
1355 hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0);
1356 status = hid_start_in(hid);
1357 if (status < 0)
1358 hid_io_error(hid);
1359 usbhid_restart_queues(usbhid);
1360
1361 return 0;
1362 }
1363
1364 int usbhid_get_power(struct hid_device *hid)
1365 {
1366 struct usbhid_device *usbhid = hid->driver_data;
1367
1368 return usb_autopm_get_interface(usbhid->intf);
1369 }
1370
1371 void usbhid_put_power(struct hid_device *hid)
1372 {
1373 struct usbhid_device *usbhid = hid->driver_data;
1374
1375 usb_autopm_put_interface(usbhid->intf);
1376 }
1377
1378
1379 #ifdef CONFIG_PM
1380 static int hid_suspend(struct usb_interface *intf, pm_message_t message)
1381 {
1382 struct hid_device *hid = usb_get_intfdata(intf);
1383 struct usbhid_device *usbhid = hid->driver_data;
1384 int status;
1385
1386 if (PMSG_IS_AUTO(message)) {
1387 spin_lock_irq(&usbhid->lock); /* Sync with error handler */
1388 if (!test_bit(HID_RESET_PENDING, &usbhid->iofl)
1389 && !test_bit(HID_CLEAR_HALT, &usbhid->iofl)
1390 && !test_bit(HID_OUT_RUNNING, &usbhid->iofl)
1391 && !test_bit(HID_CTRL_RUNNING, &usbhid->iofl)
1392 && !test_bit(HID_KEYS_PRESSED, &usbhid->iofl)
1393 && (!usbhid->ledcount || ignoreled))
1394 {
1395 set_bit(HID_REPORTED_IDLE, &usbhid->iofl);
1396 spin_unlock_irq(&usbhid->lock);
1397 if (hid->driver && hid->driver->suspend) {
1398 status = hid->driver->suspend(hid, message);
1399 if (status < 0)
1400 return status;
1401 }
1402 } else {
1403 usbhid_mark_busy(usbhid);
1404 spin_unlock_irq(&usbhid->lock);
1405 return -EBUSY;
1406 }
1407
1408 } else {
1409 if (hid->driver && hid->driver->suspend) {
1410 status = hid->driver->suspend(hid, message);
1411 if (status < 0)
1412 return status;
1413 }
1414 spin_lock_irq(&usbhid->lock);
1415 set_bit(HID_REPORTED_IDLE, &usbhid->iofl);
1416 spin_unlock_irq(&usbhid->lock);
1417 if (usbhid_wait_io(hid) < 0)
1418 return -EIO;
1419 }
1420
1421 hid_cancel_delayed_stuff(usbhid);
1422 hid_cease_io(usbhid);
1423
1424 if (PMSG_IS_AUTO(message) && test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) {
1425 /* lost race against keypresses */
1426 status = hid_start_in(hid);
1427 if (status < 0)
1428 hid_io_error(hid);
1429 usbhid_mark_busy(usbhid);
1430 return -EBUSY;
1431 }
1432 dev_dbg(&intf->dev, "suspend\n");
1433 return 0;
1434 }
1435
1436 static int hid_resume(struct usb_interface *intf)
1437 {
1438 struct hid_device *hid = usb_get_intfdata (intf);
1439 struct usbhid_device *usbhid = hid->driver_data;
1440 int status;
1441
1442 if (!test_bit(HID_STARTED, &usbhid->iofl))
1443 return 0;
1444
1445 clear_bit(HID_REPORTED_IDLE, &usbhid->iofl);
1446 usbhid_mark_busy(usbhid);
1447
1448 if (test_bit(HID_CLEAR_HALT, &usbhid->iofl) ||
1449 test_bit(HID_RESET_PENDING, &usbhid->iofl))
1450 schedule_work(&usbhid->reset_work);
1451 usbhid->retry_delay = 0;
1452 status = hid_start_in(hid);
1453 if (status < 0)
1454 hid_io_error(hid);
1455 usbhid_restart_queues(usbhid);
1456
1457 if (status >= 0 && hid->driver && hid->driver->resume) {
1458 int ret = hid->driver->resume(hid);
1459 if (ret < 0)
1460 status = ret;
1461 }
1462 dev_dbg(&intf->dev, "resume status %d\n", status);
1463 return 0;
1464 }
1465
1466 static int hid_reset_resume(struct usb_interface *intf)
1467 {
1468 struct hid_device *hid = usb_get_intfdata(intf);
1469 struct usbhid_device *usbhid = hid->driver_data;
1470 int status;
1471
1472 clear_bit(HID_REPORTED_IDLE, &usbhid->iofl);
1473 status = hid_post_reset(intf);
1474 if (status >= 0 && hid->driver && hid->driver->reset_resume) {
1475 int ret = hid->driver->reset_resume(hid);
1476 if (ret < 0)
1477 status = ret;
1478 }
1479 return status;
1480 }
1481
1482 #endif /* CONFIG_PM */
1483
1484 static const struct usb_device_id hid_usb_ids[] = {
1485 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
1486 .bInterfaceClass = USB_INTERFACE_CLASS_HID },
1487 { } /* Terminating entry */
1488 };
1489
1490 MODULE_DEVICE_TABLE (usb, hid_usb_ids);
1491
1492 static struct usb_driver hid_driver = {
1493 .name = "usbhid",
1494 .probe = usbhid_probe,
1495 .disconnect = usbhid_disconnect,
1496 #ifdef CONFIG_PM
1497 .suspend = hid_suspend,
1498 .resume = hid_resume,
1499 .reset_resume = hid_reset_resume,
1500 #endif
1501 .pre_reset = hid_pre_reset,
1502 .post_reset = hid_post_reset,
1503 .id_table = hid_usb_ids,
1504 .supports_autosuspend = 1,
1505 };
1506
1507 static const struct hid_device_id hid_usb_table[] = {
1508 { HID_USB_DEVICE(HID_ANY_ID, HID_ANY_ID) },
1509 { }
1510 };
1511
1512 struct usb_interface *usbhid_find_interface(int minor)
1513 {
1514 return usb_find_interface(&hid_driver, minor);
1515 }
1516
1517 static struct hid_driver hid_usb_driver = {
1518 .name = "generic-usb",
1519 .id_table = hid_usb_table,
1520 };
1521
1522 static int __init hid_init(void)
1523 {
1524 int retval = -ENOMEM;
1525
1526 retval = hid_register_driver(&hid_usb_driver);
1527 if (retval)
1528 goto hid_register_fail;
1529 retval = usbhid_quirks_init(quirks_param);
1530 if (retval)
1531 goto usbhid_quirks_init_fail;
1532 retval = usb_register(&hid_driver);
1533 if (retval)
1534 goto usb_register_fail;
1535 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1536
1537 return 0;
1538 usb_register_fail:
1539 usbhid_quirks_exit();
1540 usbhid_quirks_init_fail:
1541 hid_unregister_driver(&hid_usb_driver);
1542 hid_register_fail:
1543 return retval;
1544 }
1545
1546 static void __exit hid_exit(void)
1547 {
1548 usb_deregister(&hid_driver);
1549 usbhid_quirks_exit();
1550 hid_unregister_driver(&hid_usb_driver);
1551 }
1552
1553 module_init(hid_init);
1554 module_exit(hid_exit);
1555
1556 MODULE_AUTHOR("Andreas Gal");
1557 MODULE_AUTHOR("Vojtech Pavlik");
1558 MODULE_AUTHOR("Jiri Kosina");
1559 MODULE_DESCRIPTION(DRIVER_DESC);
1560 MODULE_LICENSE(DRIVER_LICENSE);