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ALSA: timer: Harden slave timer list handling
[deliverable/linux.git] / sound / core / timer.c
1 /*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <linux/device.h>
28 #include <linux/module.h>
29 #include <linux/string.h>
30 #include <sound/core.h>
31 #include <sound/timer.h>
32 #include <sound/control.h>
33 #include <sound/info.h>
34 #include <sound/minors.h>
35 #include <sound/initval.h>
36 #include <linux/kmod.h>
37
38 #if IS_ENABLED(CONFIG_SND_HRTIMER)
39 #define DEFAULT_TIMER_LIMIT 4
40 #elif IS_ENABLED(CONFIG_SND_RTCTIMER)
41 #define DEFAULT_TIMER_LIMIT 2
42 #else
43 #define DEFAULT_TIMER_LIMIT 1
44 #endif
45
46 static int timer_limit = DEFAULT_TIMER_LIMIT;
47 static int timer_tstamp_monotonic = 1;
48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
49 MODULE_DESCRIPTION("ALSA timer interface");
50 MODULE_LICENSE("GPL");
51 module_param(timer_limit, int, 0444);
52 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
53 module_param(timer_tstamp_monotonic, int, 0444);
54 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
55
56 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
57 MODULE_ALIAS("devname:snd/timer");
58
59 struct snd_timer_user {
60 struct snd_timer_instance *timeri;
61 int tread; /* enhanced read with timestamps and events */
62 unsigned long ticks;
63 unsigned long overrun;
64 int qhead;
65 int qtail;
66 int qused;
67 int queue_size;
68 struct snd_timer_read *queue;
69 struct snd_timer_tread *tqueue;
70 spinlock_t qlock;
71 unsigned long last_resolution;
72 unsigned int filter;
73 struct timespec tstamp; /* trigger tstamp */
74 wait_queue_head_t qchange_sleep;
75 struct fasync_struct *fasync;
76 struct mutex ioctl_lock;
77 };
78
79 /* list of timers */
80 static LIST_HEAD(snd_timer_list);
81
82 /* list of slave instances */
83 static LIST_HEAD(snd_timer_slave_list);
84
85 /* lock for slave active lists */
86 static DEFINE_SPINLOCK(slave_active_lock);
87
88 static DEFINE_MUTEX(register_mutex);
89
90 static int snd_timer_free(struct snd_timer *timer);
91 static int snd_timer_dev_free(struct snd_device *device);
92 static int snd_timer_dev_register(struct snd_device *device);
93 static int snd_timer_dev_disconnect(struct snd_device *device);
94
95 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
96
97 /*
98 * create a timer instance with the given owner string.
99 * when timer is not NULL, increments the module counter
100 */
101 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
102 struct snd_timer *timer)
103 {
104 struct snd_timer_instance *timeri;
105 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
106 if (timeri == NULL)
107 return NULL;
108 timeri->owner = kstrdup(owner, GFP_KERNEL);
109 if (! timeri->owner) {
110 kfree(timeri);
111 return NULL;
112 }
113 INIT_LIST_HEAD(&timeri->open_list);
114 INIT_LIST_HEAD(&timeri->active_list);
115 INIT_LIST_HEAD(&timeri->ack_list);
116 INIT_LIST_HEAD(&timeri->slave_list_head);
117 INIT_LIST_HEAD(&timeri->slave_active_head);
118
119 timeri->timer = timer;
120 if (timer && !try_module_get(timer->module)) {
121 kfree(timeri->owner);
122 kfree(timeri);
123 return NULL;
124 }
125
126 return timeri;
127 }
128
129 /*
130 * find a timer instance from the given timer id
131 */
132 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
133 {
134 struct snd_timer *timer = NULL;
135
136 list_for_each_entry(timer, &snd_timer_list, device_list) {
137 if (timer->tmr_class != tid->dev_class)
138 continue;
139 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
140 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
141 (timer->card == NULL ||
142 timer->card->number != tid->card))
143 continue;
144 if (timer->tmr_device != tid->device)
145 continue;
146 if (timer->tmr_subdevice != tid->subdevice)
147 continue;
148 return timer;
149 }
150 return NULL;
151 }
152
153 #ifdef CONFIG_MODULES
154
155 static void snd_timer_request(struct snd_timer_id *tid)
156 {
157 switch (tid->dev_class) {
158 case SNDRV_TIMER_CLASS_GLOBAL:
159 if (tid->device < timer_limit)
160 request_module("snd-timer-%i", tid->device);
161 break;
162 case SNDRV_TIMER_CLASS_CARD:
163 case SNDRV_TIMER_CLASS_PCM:
164 if (tid->card < snd_ecards_limit)
165 request_module("snd-card-%i", tid->card);
166 break;
167 default:
168 break;
169 }
170 }
171
172 #endif
173
174 /*
175 * look for a master instance matching with the slave id of the given slave.
176 * when found, relink the open_link of the slave.
177 *
178 * call this with register_mutex down.
179 */
180 static void snd_timer_check_slave(struct snd_timer_instance *slave)
181 {
182 struct snd_timer *timer;
183 struct snd_timer_instance *master;
184
185 /* FIXME: it's really dumb to look up all entries.. */
186 list_for_each_entry(timer, &snd_timer_list, device_list) {
187 list_for_each_entry(master, &timer->open_list_head, open_list) {
188 if (slave->slave_class == master->slave_class &&
189 slave->slave_id == master->slave_id) {
190 list_move_tail(&slave->open_list,
191 &master->slave_list_head);
192 spin_lock_irq(&slave_active_lock);
193 slave->master = master;
194 slave->timer = master->timer;
195 spin_unlock_irq(&slave_active_lock);
196 return;
197 }
198 }
199 }
200 }
201
202 /*
203 * look for slave instances matching with the slave id of the given master.
204 * when found, relink the open_link of slaves.
205 *
206 * call this with register_mutex down.
207 */
208 static void snd_timer_check_master(struct snd_timer_instance *master)
209 {
210 struct snd_timer_instance *slave, *tmp;
211
212 /* check all pending slaves */
213 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
214 if (slave->slave_class == master->slave_class &&
215 slave->slave_id == master->slave_id) {
216 list_move_tail(&slave->open_list, &master->slave_list_head);
217 spin_lock_irq(&slave_active_lock);
218 spin_lock(&master->timer->lock);
219 slave->master = master;
220 slave->timer = master->timer;
221 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
222 list_add_tail(&slave->active_list,
223 &master->slave_active_head);
224 spin_unlock(&master->timer->lock);
225 spin_unlock_irq(&slave_active_lock);
226 }
227 }
228 }
229
230 /*
231 * open a timer instance
232 * when opening a master, the slave id must be here given.
233 */
234 int snd_timer_open(struct snd_timer_instance **ti,
235 char *owner, struct snd_timer_id *tid,
236 unsigned int slave_id)
237 {
238 struct snd_timer *timer;
239 struct snd_timer_instance *timeri = NULL;
240
241 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
242 /* open a slave instance */
243 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
244 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
245 pr_debug("ALSA: timer: invalid slave class %i\n",
246 tid->dev_sclass);
247 return -EINVAL;
248 }
249 mutex_lock(&register_mutex);
250 timeri = snd_timer_instance_new(owner, NULL);
251 if (!timeri) {
252 mutex_unlock(&register_mutex);
253 return -ENOMEM;
254 }
255 timeri->slave_class = tid->dev_sclass;
256 timeri->slave_id = tid->device;
257 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
258 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
259 snd_timer_check_slave(timeri);
260 mutex_unlock(&register_mutex);
261 *ti = timeri;
262 return 0;
263 }
264
265 /* open a master instance */
266 mutex_lock(&register_mutex);
267 timer = snd_timer_find(tid);
268 #ifdef CONFIG_MODULES
269 if (!timer) {
270 mutex_unlock(&register_mutex);
271 snd_timer_request(tid);
272 mutex_lock(&register_mutex);
273 timer = snd_timer_find(tid);
274 }
275 #endif
276 if (!timer) {
277 mutex_unlock(&register_mutex);
278 return -ENODEV;
279 }
280 if (!list_empty(&timer->open_list_head)) {
281 timeri = list_entry(timer->open_list_head.next,
282 struct snd_timer_instance, open_list);
283 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
284 mutex_unlock(&register_mutex);
285 return -EBUSY;
286 }
287 }
288 timeri = snd_timer_instance_new(owner, timer);
289 if (!timeri) {
290 mutex_unlock(&register_mutex);
291 return -ENOMEM;
292 }
293 timeri->slave_class = tid->dev_sclass;
294 timeri->slave_id = slave_id;
295 if (list_empty(&timer->open_list_head) && timer->hw.open)
296 timer->hw.open(timer);
297 list_add_tail(&timeri->open_list, &timer->open_list_head);
298 snd_timer_check_master(timeri);
299 mutex_unlock(&register_mutex);
300 *ti = timeri;
301 return 0;
302 }
303
304 static int _snd_timer_stop(struct snd_timer_instance *timeri,
305 int keep_flag, int event);
306
307 /*
308 * close a timer instance
309 */
310 int snd_timer_close(struct snd_timer_instance *timeri)
311 {
312 struct snd_timer *timer = NULL;
313 struct snd_timer_instance *slave, *tmp;
314
315 if (snd_BUG_ON(!timeri))
316 return -ENXIO;
317
318 /* force to stop the timer */
319 snd_timer_stop(timeri);
320
321 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
322 /* wait, until the active callback is finished */
323 spin_lock_irq(&slave_active_lock);
324 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
325 spin_unlock_irq(&slave_active_lock);
326 udelay(10);
327 spin_lock_irq(&slave_active_lock);
328 }
329 spin_unlock_irq(&slave_active_lock);
330 mutex_lock(&register_mutex);
331 list_del(&timeri->open_list);
332 mutex_unlock(&register_mutex);
333 } else {
334 timer = timeri->timer;
335 if (snd_BUG_ON(!timer))
336 goto out;
337 /* wait, until the active callback is finished */
338 spin_lock_irq(&timer->lock);
339 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
340 spin_unlock_irq(&timer->lock);
341 udelay(10);
342 spin_lock_irq(&timer->lock);
343 }
344 spin_unlock_irq(&timer->lock);
345 mutex_lock(&register_mutex);
346 list_del(&timeri->open_list);
347 if (timer && list_empty(&timer->open_list_head) &&
348 timer->hw.close)
349 timer->hw.close(timer);
350 /* remove slave links */
351 spin_lock_irq(&slave_active_lock);
352 spin_lock(&timer->lock);
353 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
354 open_list) {
355 list_move_tail(&slave->open_list, &snd_timer_slave_list);
356 slave->master = NULL;
357 slave->timer = NULL;
358 list_del_init(&slave->ack_list);
359 list_del_init(&slave->active_list);
360 }
361 spin_unlock(&timer->lock);
362 spin_unlock_irq(&slave_active_lock);
363 mutex_unlock(&register_mutex);
364 }
365 out:
366 if (timeri->private_free)
367 timeri->private_free(timeri);
368 kfree(timeri->owner);
369 kfree(timeri);
370 if (timer)
371 module_put(timer->module);
372 return 0;
373 }
374
375 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
376 {
377 struct snd_timer * timer;
378
379 if (timeri == NULL)
380 return 0;
381 if ((timer = timeri->timer) != NULL) {
382 if (timer->hw.c_resolution)
383 return timer->hw.c_resolution(timer);
384 return timer->hw.resolution;
385 }
386 return 0;
387 }
388
389 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
390 {
391 struct snd_timer *timer;
392 unsigned long flags;
393 unsigned long resolution = 0;
394 struct snd_timer_instance *ts;
395 struct timespec tstamp;
396
397 if (timer_tstamp_monotonic)
398 ktime_get_ts(&tstamp);
399 else
400 getnstimeofday(&tstamp);
401 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
402 event > SNDRV_TIMER_EVENT_PAUSE))
403 return;
404 if (event == SNDRV_TIMER_EVENT_START ||
405 event == SNDRV_TIMER_EVENT_CONTINUE)
406 resolution = snd_timer_resolution(ti);
407 if (ti->ccallback)
408 ti->ccallback(ti, event, &tstamp, resolution);
409 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
410 return;
411 timer = ti->timer;
412 if (timer == NULL)
413 return;
414 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
415 return;
416 spin_lock_irqsave(&timer->lock, flags);
417 list_for_each_entry(ts, &ti->slave_active_head, active_list)
418 if (ts->ccallback)
419 ts->ccallback(ti, event + 100, &tstamp, resolution);
420 spin_unlock_irqrestore(&timer->lock, flags);
421 }
422
423 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
424 unsigned long sticks)
425 {
426 list_move_tail(&timeri->active_list, &timer->active_list_head);
427 if (timer->running) {
428 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
429 goto __start_now;
430 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
431 timeri->flags |= SNDRV_TIMER_IFLG_START;
432 return 1; /* delayed start */
433 } else {
434 timer->sticks = sticks;
435 timer->hw.start(timer);
436 __start_now:
437 timer->running++;
438 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
439 return 0;
440 }
441 }
442
443 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
444 {
445 unsigned long flags;
446
447 spin_lock_irqsave(&slave_active_lock, flags);
448 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
449 if (timeri->master && timeri->timer) {
450 spin_lock(&timeri->timer->lock);
451 list_add_tail(&timeri->active_list,
452 &timeri->master->slave_active_head);
453 spin_unlock(&timeri->timer->lock);
454 }
455 spin_unlock_irqrestore(&slave_active_lock, flags);
456 return 1; /* delayed start */
457 }
458
459 /*
460 * start the timer instance
461 */
462 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
463 {
464 struct snd_timer *timer;
465 int result = -EINVAL;
466 unsigned long flags;
467
468 if (timeri == NULL || ticks < 1)
469 return -EINVAL;
470 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
471 result = snd_timer_start_slave(timeri);
472 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
473 return result;
474 }
475 timer = timeri->timer;
476 if (timer == NULL)
477 return -EINVAL;
478 spin_lock_irqsave(&timer->lock, flags);
479 timeri->ticks = timeri->cticks = ticks;
480 timeri->pticks = 0;
481 result = snd_timer_start1(timer, timeri, ticks);
482 spin_unlock_irqrestore(&timer->lock, flags);
483 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
484 return result;
485 }
486
487 static int _snd_timer_stop(struct snd_timer_instance * timeri,
488 int keep_flag, int event)
489 {
490 struct snd_timer *timer;
491 unsigned long flags;
492
493 if (snd_BUG_ON(!timeri))
494 return -ENXIO;
495
496 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
497 if (!keep_flag) {
498 spin_lock_irqsave(&slave_active_lock, flags);
499 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
500 list_del_init(&timeri->ack_list);
501 list_del_init(&timeri->active_list);
502 spin_unlock_irqrestore(&slave_active_lock, flags);
503 }
504 goto __end;
505 }
506 timer = timeri->timer;
507 if (!timer)
508 return -EINVAL;
509 spin_lock_irqsave(&timer->lock, flags);
510 list_del_init(&timeri->ack_list);
511 list_del_init(&timeri->active_list);
512 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
513 !(--timer->running)) {
514 timer->hw.stop(timer);
515 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
516 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
517 snd_timer_reschedule(timer, 0);
518 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
519 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
520 timer->hw.start(timer);
521 }
522 }
523 }
524 if (!keep_flag)
525 timeri->flags &=
526 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
527 spin_unlock_irqrestore(&timer->lock, flags);
528 __end:
529 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
530 snd_timer_notify1(timeri, event);
531 return 0;
532 }
533
534 /*
535 * stop the timer instance.
536 *
537 * do not call this from the timer callback!
538 */
539 int snd_timer_stop(struct snd_timer_instance *timeri)
540 {
541 struct snd_timer *timer;
542 unsigned long flags;
543 int err;
544
545 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
546 if (err < 0)
547 return err;
548 timer = timeri->timer;
549 if (!timer)
550 return -EINVAL;
551 spin_lock_irqsave(&timer->lock, flags);
552 timeri->cticks = timeri->ticks;
553 timeri->pticks = 0;
554 spin_unlock_irqrestore(&timer->lock, flags);
555 return 0;
556 }
557
558 /*
559 * start again.. the tick is kept.
560 */
561 int snd_timer_continue(struct snd_timer_instance *timeri)
562 {
563 struct snd_timer *timer;
564 int result = -EINVAL;
565 unsigned long flags;
566
567 if (timeri == NULL)
568 return result;
569 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
570 return snd_timer_start_slave(timeri);
571 timer = timeri->timer;
572 if (! timer)
573 return -EINVAL;
574 spin_lock_irqsave(&timer->lock, flags);
575 if (!timeri->cticks)
576 timeri->cticks = 1;
577 timeri->pticks = 0;
578 result = snd_timer_start1(timer, timeri, timer->sticks);
579 spin_unlock_irqrestore(&timer->lock, flags);
580 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
581 return result;
582 }
583
584 /*
585 * pause.. remember the ticks left
586 */
587 int snd_timer_pause(struct snd_timer_instance * timeri)
588 {
589 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
590 }
591
592 /*
593 * reschedule the timer
594 *
595 * start pending instances and check the scheduling ticks.
596 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
597 */
598 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
599 {
600 struct snd_timer_instance *ti;
601 unsigned long ticks = ~0UL;
602
603 list_for_each_entry(ti, &timer->active_list_head, active_list) {
604 if (ti->flags & SNDRV_TIMER_IFLG_START) {
605 ti->flags &= ~SNDRV_TIMER_IFLG_START;
606 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
607 timer->running++;
608 }
609 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
610 if (ticks > ti->cticks)
611 ticks = ti->cticks;
612 }
613 }
614 if (ticks == ~0UL) {
615 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
616 return;
617 }
618 if (ticks > timer->hw.ticks)
619 ticks = timer->hw.ticks;
620 if (ticks_left != ticks)
621 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
622 timer->sticks = ticks;
623 }
624
625 /*
626 * timer tasklet
627 *
628 */
629 static void snd_timer_tasklet(unsigned long arg)
630 {
631 struct snd_timer *timer = (struct snd_timer *) arg;
632 struct snd_timer_instance *ti;
633 struct list_head *p;
634 unsigned long resolution, ticks;
635 unsigned long flags;
636
637 spin_lock_irqsave(&timer->lock, flags);
638 /* now process all callbacks */
639 while (!list_empty(&timer->sack_list_head)) {
640 p = timer->sack_list_head.next; /* get first item */
641 ti = list_entry(p, struct snd_timer_instance, ack_list);
642
643 /* remove from ack_list and make empty */
644 list_del_init(p);
645
646 ticks = ti->pticks;
647 ti->pticks = 0;
648 resolution = ti->resolution;
649
650 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
651 spin_unlock(&timer->lock);
652 if (ti->callback)
653 ti->callback(ti, resolution, ticks);
654 spin_lock(&timer->lock);
655 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
656 }
657 spin_unlock_irqrestore(&timer->lock, flags);
658 }
659
660 /*
661 * timer interrupt
662 *
663 * ticks_left is usually equal to timer->sticks.
664 *
665 */
666 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
667 {
668 struct snd_timer_instance *ti, *ts, *tmp;
669 unsigned long resolution, ticks;
670 struct list_head *p, *ack_list_head;
671 unsigned long flags;
672 int use_tasklet = 0;
673
674 if (timer == NULL)
675 return;
676
677 spin_lock_irqsave(&timer->lock, flags);
678
679 /* remember the current resolution */
680 if (timer->hw.c_resolution)
681 resolution = timer->hw.c_resolution(timer);
682 else
683 resolution = timer->hw.resolution;
684
685 /* loop for all active instances
686 * Here we cannot use list_for_each_entry because the active_list of a
687 * processed instance is relinked to done_list_head before the callback
688 * is called.
689 */
690 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
691 active_list) {
692 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
693 continue;
694 ti->pticks += ticks_left;
695 ti->resolution = resolution;
696 if (ti->cticks < ticks_left)
697 ti->cticks = 0;
698 else
699 ti->cticks -= ticks_left;
700 if (ti->cticks) /* not expired */
701 continue;
702 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
703 ti->cticks = ti->ticks;
704 } else {
705 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
706 if (--timer->running)
707 list_del_init(&ti->active_list);
708 }
709 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
710 (ti->flags & SNDRV_TIMER_IFLG_FAST))
711 ack_list_head = &timer->ack_list_head;
712 else
713 ack_list_head = &timer->sack_list_head;
714 if (list_empty(&ti->ack_list))
715 list_add_tail(&ti->ack_list, ack_list_head);
716 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
717 ts->pticks = ti->pticks;
718 ts->resolution = resolution;
719 if (list_empty(&ts->ack_list))
720 list_add_tail(&ts->ack_list, ack_list_head);
721 }
722 }
723 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
724 snd_timer_reschedule(timer, timer->sticks);
725 if (timer->running) {
726 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
727 timer->hw.stop(timer);
728 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
729 }
730 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
731 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
732 /* restart timer */
733 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
734 timer->hw.start(timer);
735 }
736 } else {
737 timer->hw.stop(timer);
738 }
739
740 /* now process all fast callbacks */
741 while (!list_empty(&timer->ack_list_head)) {
742 p = timer->ack_list_head.next; /* get first item */
743 ti = list_entry(p, struct snd_timer_instance, ack_list);
744
745 /* remove from ack_list and make empty */
746 list_del_init(p);
747
748 ticks = ti->pticks;
749 ti->pticks = 0;
750
751 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
752 spin_unlock(&timer->lock);
753 if (ti->callback)
754 ti->callback(ti, resolution, ticks);
755 spin_lock(&timer->lock);
756 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
757 }
758
759 /* do we have any slow callbacks? */
760 use_tasklet = !list_empty(&timer->sack_list_head);
761 spin_unlock_irqrestore(&timer->lock, flags);
762
763 if (use_tasklet)
764 tasklet_schedule(&timer->task_queue);
765 }
766
767 /*
768
769 */
770
771 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
772 struct snd_timer **rtimer)
773 {
774 struct snd_timer *timer;
775 int err;
776 static struct snd_device_ops ops = {
777 .dev_free = snd_timer_dev_free,
778 .dev_register = snd_timer_dev_register,
779 .dev_disconnect = snd_timer_dev_disconnect,
780 };
781
782 if (snd_BUG_ON(!tid))
783 return -EINVAL;
784 if (rtimer)
785 *rtimer = NULL;
786 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
787 if (!timer)
788 return -ENOMEM;
789 timer->tmr_class = tid->dev_class;
790 timer->card = card;
791 timer->tmr_device = tid->device;
792 timer->tmr_subdevice = tid->subdevice;
793 if (id)
794 strlcpy(timer->id, id, sizeof(timer->id));
795 INIT_LIST_HEAD(&timer->device_list);
796 INIT_LIST_HEAD(&timer->open_list_head);
797 INIT_LIST_HEAD(&timer->active_list_head);
798 INIT_LIST_HEAD(&timer->ack_list_head);
799 INIT_LIST_HEAD(&timer->sack_list_head);
800 spin_lock_init(&timer->lock);
801 tasklet_init(&timer->task_queue, snd_timer_tasklet,
802 (unsigned long)timer);
803 if (card != NULL) {
804 timer->module = card->module;
805 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
806 if (err < 0) {
807 snd_timer_free(timer);
808 return err;
809 }
810 }
811 if (rtimer)
812 *rtimer = timer;
813 return 0;
814 }
815
816 static int snd_timer_free(struct snd_timer *timer)
817 {
818 if (!timer)
819 return 0;
820
821 mutex_lock(&register_mutex);
822 if (! list_empty(&timer->open_list_head)) {
823 struct list_head *p, *n;
824 struct snd_timer_instance *ti;
825 pr_warn("ALSA: timer %p is busy?\n", timer);
826 list_for_each_safe(p, n, &timer->open_list_head) {
827 list_del_init(p);
828 ti = list_entry(p, struct snd_timer_instance, open_list);
829 ti->timer = NULL;
830 }
831 }
832 list_del(&timer->device_list);
833 mutex_unlock(&register_mutex);
834
835 if (timer->private_free)
836 timer->private_free(timer);
837 kfree(timer);
838 return 0;
839 }
840
841 static int snd_timer_dev_free(struct snd_device *device)
842 {
843 struct snd_timer *timer = device->device_data;
844 return snd_timer_free(timer);
845 }
846
847 static int snd_timer_dev_register(struct snd_device *dev)
848 {
849 struct snd_timer *timer = dev->device_data;
850 struct snd_timer *timer1;
851
852 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
853 return -ENXIO;
854 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
855 !timer->hw.resolution && timer->hw.c_resolution == NULL)
856 return -EINVAL;
857
858 mutex_lock(&register_mutex);
859 list_for_each_entry(timer1, &snd_timer_list, device_list) {
860 if (timer1->tmr_class > timer->tmr_class)
861 break;
862 if (timer1->tmr_class < timer->tmr_class)
863 continue;
864 if (timer1->card && timer->card) {
865 if (timer1->card->number > timer->card->number)
866 break;
867 if (timer1->card->number < timer->card->number)
868 continue;
869 }
870 if (timer1->tmr_device > timer->tmr_device)
871 break;
872 if (timer1->tmr_device < timer->tmr_device)
873 continue;
874 if (timer1->tmr_subdevice > timer->tmr_subdevice)
875 break;
876 if (timer1->tmr_subdevice < timer->tmr_subdevice)
877 continue;
878 /* conflicts.. */
879 mutex_unlock(&register_mutex);
880 return -EBUSY;
881 }
882 list_add_tail(&timer->device_list, &timer1->device_list);
883 mutex_unlock(&register_mutex);
884 return 0;
885 }
886
887 static int snd_timer_dev_disconnect(struct snd_device *device)
888 {
889 struct snd_timer *timer = device->device_data;
890 mutex_lock(&register_mutex);
891 list_del_init(&timer->device_list);
892 mutex_unlock(&register_mutex);
893 return 0;
894 }
895
896 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
897 {
898 unsigned long flags;
899 unsigned long resolution = 0;
900 struct snd_timer_instance *ti, *ts;
901
902 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
903 return;
904 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
905 event > SNDRV_TIMER_EVENT_MRESUME))
906 return;
907 spin_lock_irqsave(&timer->lock, flags);
908 if (event == SNDRV_TIMER_EVENT_MSTART ||
909 event == SNDRV_TIMER_EVENT_MCONTINUE ||
910 event == SNDRV_TIMER_EVENT_MRESUME) {
911 if (timer->hw.c_resolution)
912 resolution = timer->hw.c_resolution(timer);
913 else
914 resolution = timer->hw.resolution;
915 }
916 list_for_each_entry(ti, &timer->active_list_head, active_list) {
917 if (ti->ccallback)
918 ti->ccallback(ti, event, tstamp, resolution);
919 list_for_each_entry(ts, &ti->slave_active_head, active_list)
920 if (ts->ccallback)
921 ts->ccallback(ts, event, tstamp, resolution);
922 }
923 spin_unlock_irqrestore(&timer->lock, flags);
924 }
925
926 /*
927 * exported functions for global timers
928 */
929 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
930 {
931 struct snd_timer_id tid;
932
933 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
934 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
935 tid.card = -1;
936 tid.device = device;
937 tid.subdevice = 0;
938 return snd_timer_new(NULL, id, &tid, rtimer);
939 }
940
941 int snd_timer_global_free(struct snd_timer *timer)
942 {
943 return snd_timer_free(timer);
944 }
945
946 int snd_timer_global_register(struct snd_timer *timer)
947 {
948 struct snd_device dev;
949
950 memset(&dev, 0, sizeof(dev));
951 dev.device_data = timer;
952 return snd_timer_dev_register(&dev);
953 }
954
955 /*
956 * System timer
957 */
958
959 struct snd_timer_system_private {
960 struct timer_list tlist;
961 unsigned long last_expires;
962 unsigned long last_jiffies;
963 unsigned long correction;
964 };
965
966 static void snd_timer_s_function(unsigned long data)
967 {
968 struct snd_timer *timer = (struct snd_timer *)data;
969 struct snd_timer_system_private *priv = timer->private_data;
970 unsigned long jiff = jiffies;
971 if (time_after(jiff, priv->last_expires))
972 priv->correction += (long)jiff - (long)priv->last_expires;
973 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
974 }
975
976 static int snd_timer_s_start(struct snd_timer * timer)
977 {
978 struct snd_timer_system_private *priv;
979 unsigned long njiff;
980
981 priv = (struct snd_timer_system_private *) timer->private_data;
982 njiff = (priv->last_jiffies = jiffies);
983 if (priv->correction > timer->sticks - 1) {
984 priv->correction -= timer->sticks - 1;
985 njiff++;
986 } else {
987 njiff += timer->sticks - priv->correction;
988 priv->correction = 0;
989 }
990 priv->last_expires = priv->tlist.expires = njiff;
991 add_timer(&priv->tlist);
992 return 0;
993 }
994
995 static int snd_timer_s_stop(struct snd_timer * timer)
996 {
997 struct snd_timer_system_private *priv;
998 unsigned long jiff;
999
1000 priv = (struct snd_timer_system_private *) timer->private_data;
1001 del_timer(&priv->tlist);
1002 jiff = jiffies;
1003 if (time_before(jiff, priv->last_expires))
1004 timer->sticks = priv->last_expires - jiff;
1005 else
1006 timer->sticks = 1;
1007 priv->correction = 0;
1008 return 0;
1009 }
1010
1011 static struct snd_timer_hardware snd_timer_system =
1012 {
1013 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1014 .resolution = 1000000000L / HZ,
1015 .ticks = 10000000L,
1016 .start = snd_timer_s_start,
1017 .stop = snd_timer_s_stop
1018 };
1019
1020 static void snd_timer_free_system(struct snd_timer *timer)
1021 {
1022 kfree(timer->private_data);
1023 }
1024
1025 static int snd_timer_register_system(void)
1026 {
1027 struct snd_timer *timer;
1028 struct snd_timer_system_private *priv;
1029 int err;
1030
1031 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1032 if (err < 0)
1033 return err;
1034 strcpy(timer->name, "system timer");
1035 timer->hw = snd_timer_system;
1036 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1037 if (priv == NULL) {
1038 snd_timer_free(timer);
1039 return -ENOMEM;
1040 }
1041 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1042 timer->private_data = priv;
1043 timer->private_free = snd_timer_free_system;
1044 return snd_timer_global_register(timer);
1045 }
1046
1047 #ifdef CONFIG_SND_PROC_FS
1048 /*
1049 * Info interface
1050 */
1051
1052 static void snd_timer_proc_read(struct snd_info_entry *entry,
1053 struct snd_info_buffer *buffer)
1054 {
1055 struct snd_timer *timer;
1056 struct snd_timer_instance *ti;
1057
1058 mutex_lock(&register_mutex);
1059 list_for_each_entry(timer, &snd_timer_list, device_list) {
1060 switch (timer->tmr_class) {
1061 case SNDRV_TIMER_CLASS_GLOBAL:
1062 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1063 break;
1064 case SNDRV_TIMER_CLASS_CARD:
1065 snd_iprintf(buffer, "C%i-%i: ",
1066 timer->card->number, timer->tmr_device);
1067 break;
1068 case SNDRV_TIMER_CLASS_PCM:
1069 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1070 timer->tmr_device, timer->tmr_subdevice);
1071 break;
1072 default:
1073 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1074 timer->card ? timer->card->number : -1,
1075 timer->tmr_device, timer->tmr_subdevice);
1076 }
1077 snd_iprintf(buffer, "%s :", timer->name);
1078 if (timer->hw.resolution)
1079 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1080 timer->hw.resolution / 1000,
1081 timer->hw.resolution % 1000,
1082 timer->hw.ticks);
1083 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1084 snd_iprintf(buffer, " SLAVE");
1085 snd_iprintf(buffer, "\n");
1086 list_for_each_entry(ti, &timer->open_list_head, open_list)
1087 snd_iprintf(buffer, " Client %s : %s\n",
1088 ti->owner ? ti->owner : "unknown",
1089 ti->flags & (SNDRV_TIMER_IFLG_START |
1090 SNDRV_TIMER_IFLG_RUNNING)
1091 ? "running" : "stopped");
1092 }
1093 mutex_unlock(&register_mutex);
1094 }
1095
1096 static struct snd_info_entry *snd_timer_proc_entry;
1097
1098 static void __init snd_timer_proc_init(void)
1099 {
1100 struct snd_info_entry *entry;
1101
1102 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1103 if (entry != NULL) {
1104 entry->c.text.read = snd_timer_proc_read;
1105 if (snd_info_register(entry) < 0) {
1106 snd_info_free_entry(entry);
1107 entry = NULL;
1108 }
1109 }
1110 snd_timer_proc_entry = entry;
1111 }
1112
1113 static void __exit snd_timer_proc_done(void)
1114 {
1115 snd_info_free_entry(snd_timer_proc_entry);
1116 }
1117 #else /* !CONFIG_SND_PROC_FS */
1118 #define snd_timer_proc_init()
1119 #define snd_timer_proc_done()
1120 #endif
1121
1122 /*
1123 * USER SPACE interface
1124 */
1125
1126 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1127 unsigned long resolution,
1128 unsigned long ticks)
1129 {
1130 struct snd_timer_user *tu = timeri->callback_data;
1131 struct snd_timer_read *r;
1132 int prev;
1133
1134 spin_lock(&tu->qlock);
1135 if (tu->qused > 0) {
1136 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1137 r = &tu->queue[prev];
1138 if (r->resolution == resolution) {
1139 r->ticks += ticks;
1140 goto __wake;
1141 }
1142 }
1143 if (tu->qused >= tu->queue_size) {
1144 tu->overrun++;
1145 } else {
1146 r = &tu->queue[tu->qtail++];
1147 tu->qtail %= tu->queue_size;
1148 r->resolution = resolution;
1149 r->ticks = ticks;
1150 tu->qused++;
1151 }
1152 __wake:
1153 spin_unlock(&tu->qlock);
1154 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1155 wake_up(&tu->qchange_sleep);
1156 }
1157
1158 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1159 struct snd_timer_tread *tread)
1160 {
1161 if (tu->qused >= tu->queue_size) {
1162 tu->overrun++;
1163 } else {
1164 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1165 tu->qtail %= tu->queue_size;
1166 tu->qused++;
1167 }
1168 }
1169
1170 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1171 int event,
1172 struct timespec *tstamp,
1173 unsigned long resolution)
1174 {
1175 struct snd_timer_user *tu = timeri->callback_data;
1176 struct snd_timer_tread r1;
1177 unsigned long flags;
1178
1179 if (event >= SNDRV_TIMER_EVENT_START &&
1180 event <= SNDRV_TIMER_EVENT_PAUSE)
1181 tu->tstamp = *tstamp;
1182 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1183 return;
1184 r1.event = event;
1185 r1.tstamp = *tstamp;
1186 r1.val = resolution;
1187 spin_lock_irqsave(&tu->qlock, flags);
1188 snd_timer_user_append_to_tqueue(tu, &r1);
1189 spin_unlock_irqrestore(&tu->qlock, flags);
1190 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1191 wake_up(&tu->qchange_sleep);
1192 }
1193
1194 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1195 unsigned long resolution,
1196 unsigned long ticks)
1197 {
1198 struct snd_timer_user *tu = timeri->callback_data;
1199 struct snd_timer_tread *r, r1;
1200 struct timespec tstamp;
1201 int prev, append = 0;
1202
1203 memset(&tstamp, 0, sizeof(tstamp));
1204 spin_lock(&tu->qlock);
1205 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1206 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1207 spin_unlock(&tu->qlock);
1208 return;
1209 }
1210 if (tu->last_resolution != resolution || ticks > 0) {
1211 if (timer_tstamp_monotonic)
1212 ktime_get_ts(&tstamp);
1213 else
1214 getnstimeofday(&tstamp);
1215 }
1216 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1217 tu->last_resolution != resolution) {
1218 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1219 r1.tstamp = tstamp;
1220 r1.val = resolution;
1221 snd_timer_user_append_to_tqueue(tu, &r1);
1222 tu->last_resolution = resolution;
1223 append++;
1224 }
1225 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1226 goto __wake;
1227 if (ticks == 0)
1228 goto __wake;
1229 if (tu->qused > 0) {
1230 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1231 r = &tu->tqueue[prev];
1232 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1233 r->tstamp = tstamp;
1234 r->val += ticks;
1235 append++;
1236 goto __wake;
1237 }
1238 }
1239 r1.event = SNDRV_TIMER_EVENT_TICK;
1240 r1.tstamp = tstamp;
1241 r1.val = ticks;
1242 snd_timer_user_append_to_tqueue(tu, &r1);
1243 append++;
1244 __wake:
1245 spin_unlock(&tu->qlock);
1246 if (append == 0)
1247 return;
1248 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1249 wake_up(&tu->qchange_sleep);
1250 }
1251
1252 static int snd_timer_user_open(struct inode *inode, struct file *file)
1253 {
1254 struct snd_timer_user *tu;
1255 int err;
1256
1257 err = nonseekable_open(inode, file);
1258 if (err < 0)
1259 return err;
1260
1261 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1262 if (tu == NULL)
1263 return -ENOMEM;
1264 spin_lock_init(&tu->qlock);
1265 init_waitqueue_head(&tu->qchange_sleep);
1266 mutex_init(&tu->ioctl_lock);
1267 tu->ticks = 1;
1268 tu->queue_size = 128;
1269 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1270 GFP_KERNEL);
1271 if (tu->queue == NULL) {
1272 kfree(tu);
1273 return -ENOMEM;
1274 }
1275 file->private_data = tu;
1276 return 0;
1277 }
1278
1279 static int snd_timer_user_release(struct inode *inode, struct file *file)
1280 {
1281 struct snd_timer_user *tu;
1282
1283 if (file->private_data) {
1284 tu = file->private_data;
1285 file->private_data = NULL;
1286 mutex_lock(&tu->ioctl_lock);
1287 if (tu->timeri)
1288 snd_timer_close(tu->timeri);
1289 mutex_unlock(&tu->ioctl_lock);
1290 kfree(tu->queue);
1291 kfree(tu->tqueue);
1292 kfree(tu);
1293 }
1294 return 0;
1295 }
1296
1297 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1298 {
1299 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1300 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1301 id->card = -1;
1302 id->device = -1;
1303 id->subdevice = -1;
1304 }
1305
1306 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1307 {
1308 id->dev_class = timer->tmr_class;
1309 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1310 id->card = timer->card ? timer->card->number : -1;
1311 id->device = timer->tmr_device;
1312 id->subdevice = timer->tmr_subdevice;
1313 }
1314
1315 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1316 {
1317 struct snd_timer_id id;
1318 struct snd_timer *timer;
1319 struct list_head *p;
1320
1321 if (copy_from_user(&id, _tid, sizeof(id)))
1322 return -EFAULT;
1323 mutex_lock(&register_mutex);
1324 if (id.dev_class < 0) { /* first item */
1325 if (list_empty(&snd_timer_list))
1326 snd_timer_user_zero_id(&id);
1327 else {
1328 timer = list_entry(snd_timer_list.next,
1329 struct snd_timer, device_list);
1330 snd_timer_user_copy_id(&id, timer);
1331 }
1332 } else {
1333 switch (id.dev_class) {
1334 case SNDRV_TIMER_CLASS_GLOBAL:
1335 id.device = id.device < 0 ? 0 : id.device + 1;
1336 list_for_each(p, &snd_timer_list) {
1337 timer = list_entry(p, struct snd_timer, device_list);
1338 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1339 snd_timer_user_copy_id(&id, timer);
1340 break;
1341 }
1342 if (timer->tmr_device >= id.device) {
1343 snd_timer_user_copy_id(&id, timer);
1344 break;
1345 }
1346 }
1347 if (p == &snd_timer_list)
1348 snd_timer_user_zero_id(&id);
1349 break;
1350 case SNDRV_TIMER_CLASS_CARD:
1351 case SNDRV_TIMER_CLASS_PCM:
1352 if (id.card < 0) {
1353 id.card = 0;
1354 } else {
1355 if (id.card < 0) {
1356 id.card = 0;
1357 } else {
1358 if (id.device < 0) {
1359 id.device = 0;
1360 } else {
1361 if (id.subdevice < 0) {
1362 id.subdevice = 0;
1363 } else {
1364 id.subdevice++;
1365 }
1366 }
1367 }
1368 }
1369 list_for_each(p, &snd_timer_list) {
1370 timer = list_entry(p, struct snd_timer, device_list);
1371 if (timer->tmr_class > id.dev_class) {
1372 snd_timer_user_copy_id(&id, timer);
1373 break;
1374 }
1375 if (timer->tmr_class < id.dev_class)
1376 continue;
1377 if (timer->card->number > id.card) {
1378 snd_timer_user_copy_id(&id, timer);
1379 break;
1380 }
1381 if (timer->card->number < id.card)
1382 continue;
1383 if (timer->tmr_device > id.device) {
1384 snd_timer_user_copy_id(&id, timer);
1385 break;
1386 }
1387 if (timer->tmr_device < id.device)
1388 continue;
1389 if (timer->tmr_subdevice > id.subdevice) {
1390 snd_timer_user_copy_id(&id, timer);
1391 break;
1392 }
1393 if (timer->tmr_subdevice < id.subdevice)
1394 continue;
1395 snd_timer_user_copy_id(&id, timer);
1396 break;
1397 }
1398 if (p == &snd_timer_list)
1399 snd_timer_user_zero_id(&id);
1400 break;
1401 default:
1402 snd_timer_user_zero_id(&id);
1403 }
1404 }
1405 mutex_unlock(&register_mutex);
1406 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1407 return -EFAULT;
1408 return 0;
1409 }
1410
1411 static int snd_timer_user_ginfo(struct file *file,
1412 struct snd_timer_ginfo __user *_ginfo)
1413 {
1414 struct snd_timer_ginfo *ginfo;
1415 struct snd_timer_id tid;
1416 struct snd_timer *t;
1417 struct list_head *p;
1418 int err = 0;
1419
1420 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1421 if (IS_ERR(ginfo))
1422 return PTR_ERR(ginfo);
1423
1424 tid = ginfo->tid;
1425 memset(ginfo, 0, sizeof(*ginfo));
1426 ginfo->tid = tid;
1427 mutex_lock(&register_mutex);
1428 t = snd_timer_find(&tid);
1429 if (t != NULL) {
1430 ginfo->card = t->card ? t->card->number : -1;
1431 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1432 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1433 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1434 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1435 ginfo->resolution = t->hw.resolution;
1436 if (t->hw.resolution_min > 0) {
1437 ginfo->resolution_min = t->hw.resolution_min;
1438 ginfo->resolution_max = t->hw.resolution_max;
1439 }
1440 list_for_each(p, &t->open_list_head) {
1441 ginfo->clients++;
1442 }
1443 } else {
1444 err = -ENODEV;
1445 }
1446 mutex_unlock(&register_mutex);
1447 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1448 err = -EFAULT;
1449 kfree(ginfo);
1450 return err;
1451 }
1452
1453 static int snd_timer_user_gparams(struct file *file,
1454 struct snd_timer_gparams __user *_gparams)
1455 {
1456 struct snd_timer_gparams gparams;
1457 struct snd_timer *t;
1458 int err;
1459
1460 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1461 return -EFAULT;
1462 mutex_lock(&register_mutex);
1463 t = snd_timer_find(&gparams.tid);
1464 if (!t) {
1465 err = -ENODEV;
1466 goto _error;
1467 }
1468 if (!list_empty(&t->open_list_head)) {
1469 err = -EBUSY;
1470 goto _error;
1471 }
1472 if (!t->hw.set_period) {
1473 err = -ENOSYS;
1474 goto _error;
1475 }
1476 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1477 _error:
1478 mutex_unlock(&register_mutex);
1479 return err;
1480 }
1481
1482 static int snd_timer_user_gstatus(struct file *file,
1483 struct snd_timer_gstatus __user *_gstatus)
1484 {
1485 struct snd_timer_gstatus gstatus;
1486 struct snd_timer_id tid;
1487 struct snd_timer *t;
1488 int err = 0;
1489
1490 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1491 return -EFAULT;
1492 tid = gstatus.tid;
1493 memset(&gstatus, 0, sizeof(gstatus));
1494 gstatus.tid = tid;
1495 mutex_lock(&register_mutex);
1496 t = snd_timer_find(&tid);
1497 if (t != NULL) {
1498 if (t->hw.c_resolution)
1499 gstatus.resolution = t->hw.c_resolution(t);
1500 else
1501 gstatus.resolution = t->hw.resolution;
1502 if (t->hw.precise_resolution) {
1503 t->hw.precise_resolution(t, &gstatus.resolution_num,
1504 &gstatus.resolution_den);
1505 } else {
1506 gstatus.resolution_num = gstatus.resolution;
1507 gstatus.resolution_den = 1000000000uL;
1508 }
1509 } else {
1510 err = -ENODEV;
1511 }
1512 mutex_unlock(&register_mutex);
1513 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1514 err = -EFAULT;
1515 return err;
1516 }
1517
1518 static int snd_timer_user_tselect(struct file *file,
1519 struct snd_timer_select __user *_tselect)
1520 {
1521 struct snd_timer_user *tu;
1522 struct snd_timer_select tselect;
1523 char str[32];
1524 int err = 0;
1525
1526 tu = file->private_data;
1527 if (tu->timeri) {
1528 snd_timer_close(tu->timeri);
1529 tu->timeri = NULL;
1530 }
1531 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1532 err = -EFAULT;
1533 goto __err;
1534 }
1535 sprintf(str, "application %i", current->pid);
1536 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1537 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1538 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1539 if (err < 0)
1540 goto __err;
1541
1542 kfree(tu->queue);
1543 tu->queue = NULL;
1544 kfree(tu->tqueue);
1545 tu->tqueue = NULL;
1546 if (tu->tread) {
1547 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1548 GFP_KERNEL);
1549 if (tu->tqueue == NULL)
1550 err = -ENOMEM;
1551 } else {
1552 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1553 GFP_KERNEL);
1554 if (tu->queue == NULL)
1555 err = -ENOMEM;
1556 }
1557
1558 if (err < 0) {
1559 snd_timer_close(tu->timeri);
1560 tu->timeri = NULL;
1561 } else {
1562 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1563 tu->timeri->callback = tu->tread
1564 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1565 tu->timeri->ccallback = snd_timer_user_ccallback;
1566 tu->timeri->callback_data = (void *)tu;
1567 }
1568
1569 __err:
1570 return err;
1571 }
1572
1573 static int snd_timer_user_info(struct file *file,
1574 struct snd_timer_info __user *_info)
1575 {
1576 struct snd_timer_user *tu;
1577 struct snd_timer_info *info;
1578 struct snd_timer *t;
1579 int err = 0;
1580
1581 tu = file->private_data;
1582 if (!tu->timeri)
1583 return -EBADFD;
1584 t = tu->timeri->timer;
1585 if (!t)
1586 return -EBADFD;
1587
1588 info = kzalloc(sizeof(*info), GFP_KERNEL);
1589 if (! info)
1590 return -ENOMEM;
1591 info->card = t->card ? t->card->number : -1;
1592 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1593 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1594 strlcpy(info->id, t->id, sizeof(info->id));
1595 strlcpy(info->name, t->name, sizeof(info->name));
1596 info->resolution = t->hw.resolution;
1597 if (copy_to_user(_info, info, sizeof(*_info)))
1598 err = -EFAULT;
1599 kfree(info);
1600 return err;
1601 }
1602
1603 static int snd_timer_user_params(struct file *file,
1604 struct snd_timer_params __user *_params)
1605 {
1606 struct snd_timer_user *tu;
1607 struct snd_timer_params params;
1608 struct snd_timer *t;
1609 struct snd_timer_read *tr;
1610 struct snd_timer_tread *ttr;
1611 int err;
1612
1613 tu = file->private_data;
1614 if (!tu->timeri)
1615 return -EBADFD;
1616 t = tu->timeri->timer;
1617 if (!t)
1618 return -EBADFD;
1619 if (copy_from_user(&params, _params, sizeof(params)))
1620 return -EFAULT;
1621 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1622 err = -EINVAL;
1623 goto _end;
1624 }
1625 if (params.queue_size > 0 &&
1626 (params.queue_size < 32 || params.queue_size > 1024)) {
1627 err = -EINVAL;
1628 goto _end;
1629 }
1630 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1631 (1<<SNDRV_TIMER_EVENT_TICK)|
1632 (1<<SNDRV_TIMER_EVENT_START)|
1633 (1<<SNDRV_TIMER_EVENT_STOP)|
1634 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1635 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1636 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1637 (1<<SNDRV_TIMER_EVENT_RESUME)|
1638 (1<<SNDRV_TIMER_EVENT_MSTART)|
1639 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1640 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1641 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1642 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1643 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1644 err = -EINVAL;
1645 goto _end;
1646 }
1647 snd_timer_stop(tu->timeri);
1648 spin_lock_irq(&t->lock);
1649 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1650 SNDRV_TIMER_IFLG_EXCLUSIVE|
1651 SNDRV_TIMER_IFLG_EARLY_EVENT);
1652 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1653 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1654 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1655 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1656 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1657 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1658 spin_unlock_irq(&t->lock);
1659 if (params.queue_size > 0 &&
1660 (unsigned int)tu->queue_size != params.queue_size) {
1661 if (tu->tread) {
1662 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1663 GFP_KERNEL);
1664 if (ttr) {
1665 kfree(tu->tqueue);
1666 tu->queue_size = params.queue_size;
1667 tu->tqueue = ttr;
1668 }
1669 } else {
1670 tr = kmalloc(params.queue_size * sizeof(*tr),
1671 GFP_KERNEL);
1672 if (tr) {
1673 kfree(tu->queue);
1674 tu->queue_size = params.queue_size;
1675 tu->queue = tr;
1676 }
1677 }
1678 }
1679 tu->qhead = tu->qtail = tu->qused = 0;
1680 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1681 if (tu->tread) {
1682 struct snd_timer_tread tread;
1683 tread.event = SNDRV_TIMER_EVENT_EARLY;
1684 tread.tstamp.tv_sec = 0;
1685 tread.tstamp.tv_nsec = 0;
1686 tread.val = 0;
1687 snd_timer_user_append_to_tqueue(tu, &tread);
1688 } else {
1689 struct snd_timer_read *r = &tu->queue[0];
1690 r->resolution = 0;
1691 r->ticks = 0;
1692 tu->qused++;
1693 tu->qtail++;
1694 }
1695 }
1696 tu->filter = params.filter;
1697 tu->ticks = params.ticks;
1698 err = 0;
1699 _end:
1700 if (copy_to_user(_params, &params, sizeof(params)))
1701 return -EFAULT;
1702 return err;
1703 }
1704
1705 static int snd_timer_user_status(struct file *file,
1706 struct snd_timer_status __user *_status)
1707 {
1708 struct snd_timer_user *tu;
1709 struct snd_timer_status status;
1710
1711 tu = file->private_data;
1712 if (!tu->timeri)
1713 return -EBADFD;
1714 memset(&status, 0, sizeof(status));
1715 status.tstamp = tu->tstamp;
1716 status.resolution = snd_timer_resolution(tu->timeri);
1717 status.lost = tu->timeri->lost;
1718 status.overrun = tu->overrun;
1719 spin_lock_irq(&tu->qlock);
1720 status.queue = tu->qused;
1721 spin_unlock_irq(&tu->qlock);
1722 if (copy_to_user(_status, &status, sizeof(status)))
1723 return -EFAULT;
1724 return 0;
1725 }
1726
1727 static int snd_timer_user_start(struct file *file)
1728 {
1729 int err;
1730 struct snd_timer_user *tu;
1731
1732 tu = file->private_data;
1733 if (!tu->timeri)
1734 return -EBADFD;
1735 snd_timer_stop(tu->timeri);
1736 tu->timeri->lost = 0;
1737 tu->last_resolution = 0;
1738 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1739 }
1740
1741 static int snd_timer_user_stop(struct file *file)
1742 {
1743 int err;
1744 struct snd_timer_user *tu;
1745
1746 tu = file->private_data;
1747 if (!tu->timeri)
1748 return -EBADFD;
1749 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1750 }
1751
1752 static int snd_timer_user_continue(struct file *file)
1753 {
1754 int err;
1755 struct snd_timer_user *tu;
1756
1757 tu = file->private_data;
1758 if (!tu->timeri)
1759 return -EBADFD;
1760 tu->timeri->lost = 0;
1761 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1762 }
1763
1764 static int snd_timer_user_pause(struct file *file)
1765 {
1766 int err;
1767 struct snd_timer_user *tu;
1768
1769 tu = file->private_data;
1770 if (!tu->timeri)
1771 return -EBADFD;
1772 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1773 }
1774
1775 enum {
1776 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1777 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1778 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1779 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1780 };
1781
1782 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1783 unsigned long arg)
1784 {
1785 struct snd_timer_user *tu;
1786 void __user *argp = (void __user *)arg;
1787 int __user *p = argp;
1788
1789 tu = file->private_data;
1790 switch (cmd) {
1791 case SNDRV_TIMER_IOCTL_PVERSION:
1792 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1793 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1794 return snd_timer_user_next_device(argp);
1795 case SNDRV_TIMER_IOCTL_TREAD:
1796 {
1797 int xarg;
1798
1799 if (tu->timeri) /* too late */
1800 return -EBUSY;
1801 if (get_user(xarg, p))
1802 return -EFAULT;
1803 tu->tread = xarg ? 1 : 0;
1804 return 0;
1805 }
1806 case SNDRV_TIMER_IOCTL_GINFO:
1807 return snd_timer_user_ginfo(file, argp);
1808 case SNDRV_TIMER_IOCTL_GPARAMS:
1809 return snd_timer_user_gparams(file, argp);
1810 case SNDRV_TIMER_IOCTL_GSTATUS:
1811 return snd_timer_user_gstatus(file, argp);
1812 case SNDRV_TIMER_IOCTL_SELECT:
1813 return snd_timer_user_tselect(file, argp);
1814 case SNDRV_TIMER_IOCTL_INFO:
1815 return snd_timer_user_info(file, argp);
1816 case SNDRV_TIMER_IOCTL_PARAMS:
1817 return snd_timer_user_params(file, argp);
1818 case SNDRV_TIMER_IOCTL_STATUS:
1819 return snd_timer_user_status(file, argp);
1820 case SNDRV_TIMER_IOCTL_START:
1821 case SNDRV_TIMER_IOCTL_START_OLD:
1822 return snd_timer_user_start(file);
1823 case SNDRV_TIMER_IOCTL_STOP:
1824 case SNDRV_TIMER_IOCTL_STOP_OLD:
1825 return snd_timer_user_stop(file);
1826 case SNDRV_TIMER_IOCTL_CONTINUE:
1827 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1828 return snd_timer_user_continue(file);
1829 case SNDRV_TIMER_IOCTL_PAUSE:
1830 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1831 return snd_timer_user_pause(file);
1832 }
1833 return -ENOTTY;
1834 }
1835
1836 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1837 unsigned long arg)
1838 {
1839 struct snd_timer_user *tu = file->private_data;
1840 long ret;
1841
1842 mutex_lock(&tu->ioctl_lock);
1843 ret = __snd_timer_user_ioctl(file, cmd, arg);
1844 mutex_unlock(&tu->ioctl_lock);
1845 return ret;
1846 }
1847
1848 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1849 {
1850 struct snd_timer_user *tu;
1851
1852 tu = file->private_data;
1853 return fasync_helper(fd, file, on, &tu->fasync);
1854 }
1855
1856 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1857 size_t count, loff_t *offset)
1858 {
1859 struct snd_timer_user *tu;
1860 long result = 0, unit;
1861 int err = 0;
1862
1863 tu = file->private_data;
1864 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1865 spin_lock_irq(&tu->qlock);
1866 while ((long)count - result >= unit) {
1867 while (!tu->qused) {
1868 wait_queue_t wait;
1869
1870 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1871 err = -EAGAIN;
1872 break;
1873 }
1874
1875 set_current_state(TASK_INTERRUPTIBLE);
1876 init_waitqueue_entry(&wait, current);
1877 add_wait_queue(&tu->qchange_sleep, &wait);
1878
1879 spin_unlock_irq(&tu->qlock);
1880 schedule();
1881 spin_lock_irq(&tu->qlock);
1882
1883 remove_wait_queue(&tu->qchange_sleep, &wait);
1884
1885 if (signal_pending(current)) {
1886 err = -ERESTARTSYS;
1887 break;
1888 }
1889 }
1890
1891 spin_unlock_irq(&tu->qlock);
1892 if (err < 0)
1893 goto _error;
1894
1895 if (tu->tread) {
1896 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1897 sizeof(struct snd_timer_tread))) {
1898 err = -EFAULT;
1899 goto _error;
1900 }
1901 } else {
1902 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1903 sizeof(struct snd_timer_read))) {
1904 err = -EFAULT;
1905 goto _error;
1906 }
1907 }
1908
1909 tu->qhead %= tu->queue_size;
1910
1911 result += unit;
1912 buffer += unit;
1913
1914 spin_lock_irq(&tu->qlock);
1915 tu->qused--;
1916 }
1917 spin_unlock_irq(&tu->qlock);
1918 _error:
1919 return result > 0 ? result : err;
1920 }
1921
1922 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1923 {
1924 unsigned int mask;
1925 struct snd_timer_user *tu;
1926
1927 tu = file->private_data;
1928
1929 poll_wait(file, &tu->qchange_sleep, wait);
1930
1931 mask = 0;
1932 if (tu->qused)
1933 mask |= POLLIN | POLLRDNORM;
1934
1935 return mask;
1936 }
1937
1938 #ifdef CONFIG_COMPAT
1939 #include "timer_compat.c"
1940 #else
1941 #define snd_timer_user_ioctl_compat NULL
1942 #endif
1943
1944 static const struct file_operations snd_timer_f_ops =
1945 {
1946 .owner = THIS_MODULE,
1947 .read = snd_timer_user_read,
1948 .open = snd_timer_user_open,
1949 .release = snd_timer_user_release,
1950 .llseek = no_llseek,
1951 .poll = snd_timer_user_poll,
1952 .unlocked_ioctl = snd_timer_user_ioctl,
1953 .compat_ioctl = snd_timer_user_ioctl_compat,
1954 .fasync = snd_timer_user_fasync,
1955 };
1956
1957 /* unregister the system timer */
1958 static void snd_timer_free_all(void)
1959 {
1960 struct snd_timer *timer, *n;
1961
1962 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
1963 snd_timer_free(timer);
1964 }
1965
1966 static struct device timer_dev;
1967
1968 /*
1969 * ENTRY functions
1970 */
1971
1972 static int __init alsa_timer_init(void)
1973 {
1974 int err;
1975
1976 snd_device_initialize(&timer_dev, NULL);
1977 dev_set_name(&timer_dev, "timer");
1978
1979 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1980 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1981 "system timer");
1982 #endif
1983
1984 err = snd_timer_register_system();
1985 if (err < 0) {
1986 pr_err("ALSA: unable to register system timer (%i)\n", err);
1987 put_device(&timer_dev);
1988 return err;
1989 }
1990
1991 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1992 &snd_timer_f_ops, NULL, &timer_dev);
1993 if (err < 0) {
1994 pr_err("ALSA: unable to register timer device (%i)\n", err);
1995 snd_timer_free_all();
1996 put_device(&timer_dev);
1997 return err;
1998 }
1999
2000 snd_timer_proc_init();
2001 return 0;
2002 }
2003
2004 static void __exit alsa_timer_exit(void)
2005 {
2006 snd_unregister_device(&timer_dev);
2007 snd_timer_free_all();
2008 put_device(&timer_dev);
2009 snd_timer_proc_done();
2010 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2011 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2012 #endif
2013 }
2014
2015 module_init(alsa_timer_init)
2016 module_exit(alsa_timer_exit)
2017
2018 EXPORT_SYMBOL(snd_timer_open);
2019 EXPORT_SYMBOL(snd_timer_close);
2020 EXPORT_SYMBOL(snd_timer_resolution);
2021 EXPORT_SYMBOL(snd_timer_start);
2022 EXPORT_SYMBOL(snd_timer_stop);
2023 EXPORT_SYMBOL(snd_timer_continue);
2024 EXPORT_SYMBOL(snd_timer_pause);
2025 EXPORT_SYMBOL(snd_timer_new);
2026 EXPORT_SYMBOL(snd_timer_notify);
2027 EXPORT_SYMBOL(snd_timer_global_new);
2028 EXPORT_SYMBOL(snd_timer_global_free);
2029 EXPORT_SYMBOL(snd_timer_global_register);
2030 EXPORT_SYMBOL(snd_timer_interrupt);
Linux kernel - Deliverables
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