1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
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 <linux/sched/signal.h>
31#include <sound/core.h>
32#include <sound/timer.h>
33#include <sound/control.h>
34#include <sound/info.h>
35#include <sound/minors.h>
36#include <sound/initval.h>
37#include <linux/kmod.h>
38
39
40#define SNDRV_TIMER_IFLG_PAUSED 0x00010000
41
42#if IS_ENABLED(CONFIG_SND_HRTIMER)
43#define DEFAULT_TIMER_LIMIT 4
44#else
45#define DEFAULT_TIMER_LIMIT 1
46#endif
47
48static int timer_limit = DEFAULT_TIMER_LIMIT;
49static int timer_tstamp_monotonic = 1;
50MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
51MODULE_DESCRIPTION("ALSA timer interface");
52MODULE_LICENSE("GPL");
53module_param(timer_limit, int, 0444);
54MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
55module_param(timer_tstamp_monotonic, int, 0444);
56MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
57
58MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
59MODULE_ALIAS("devname:snd/timer");
60
61struct snd_timer_user {
62 struct snd_timer_instance *timeri;
63 int tread;
64 unsigned long ticks;
65 unsigned long overrun;
66 int qhead;
67 int qtail;
68 int qused;
69 int queue_size;
70 bool disconnected;
71 struct snd_timer_read *queue;
72 struct snd_timer_tread *tqueue;
73 spinlock_t qlock;
74 unsigned long last_resolution;
75 unsigned int filter;
76 struct timespec tstamp;
77 wait_queue_head_t qchange_sleep;
78 struct fasync_struct *fasync;
79 struct mutex ioctl_lock;
80};
81
82
83static LIST_HEAD(snd_timer_list);
84
85
86static LIST_HEAD(snd_timer_slave_list);
87
88
89static DEFINE_SPINLOCK(slave_active_lock);
90
91static DEFINE_MUTEX(register_mutex);
92
93static int snd_timer_free(struct snd_timer *timer);
94static int snd_timer_dev_free(struct snd_device *device);
95static int snd_timer_dev_register(struct snd_device *device);
96static int snd_timer_dev_disconnect(struct snd_device *device);
97
98static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
99
100
101
102
103
104static struct snd_timer_instance *snd_timer_instance_new(char *owner,
105 struct snd_timer *timer)
106{
107 struct snd_timer_instance *timeri;
108 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
109 if (timeri == NULL)
110 return NULL;
111 timeri->owner = kstrdup(owner, GFP_KERNEL);
112 if (! timeri->owner) {
113 kfree(timeri);
114 return NULL;
115 }
116 INIT_LIST_HEAD(&timeri->open_list);
117 INIT_LIST_HEAD(&timeri->active_list);
118 INIT_LIST_HEAD(&timeri->ack_list);
119 INIT_LIST_HEAD(&timeri->slave_list_head);
120 INIT_LIST_HEAD(&timeri->slave_active_head);
121
122 timeri->timer = timer;
123 if (timer && !try_module_get(timer->module)) {
124 kfree(timeri->owner);
125 kfree(timeri);
126 return NULL;
127 }
128
129 return timeri;
130}
131
132
133
134
135static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
136{
137 struct snd_timer *timer = NULL;
138
139 list_for_each_entry(timer, &snd_timer_list, device_list) {
140 if (timer->tmr_class != tid->dev_class)
141 continue;
142 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
143 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
144 (timer->card == NULL ||
145 timer->card->number != tid->card))
146 continue;
147 if (timer->tmr_device != tid->device)
148 continue;
149 if (timer->tmr_subdevice != tid->subdevice)
150 continue;
151 return timer;
152 }
153 return NULL;
154}
155
156#ifdef CONFIG_MODULES
157
158static void snd_timer_request(struct snd_timer_id *tid)
159{
160 switch (tid->dev_class) {
161 case SNDRV_TIMER_CLASS_GLOBAL:
162 if (tid->device < timer_limit)
163 request_module("snd-timer-%i", tid->device);
164 break;
165 case SNDRV_TIMER_CLASS_CARD:
166 case SNDRV_TIMER_CLASS_PCM:
167 if (tid->card < snd_ecards_limit)
168 request_module("snd-card-%i", tid->card);
169 break;
170 default:
171 break;
172 }
173}
174
175#endif
176
177
178
179
180
181
182
183static void snd_timer_check_slave(struct snd_timer_instance *slave)
184{
185 struct snd_timer *timer;
186 struct snd_timer_instance *master;
187
188
189 list_for_each_entry(timer, &snd_timer_list, device_list) {
190 list_for_each_entry(master, &timer->open_list_head, open_list) {
191 if (slave->slave_class == master->slave_class &&
192 slave->slave_id == master->slave_id) {
193 list_move_tail(&slave->open_list,
194 &master->slave_list_head);
195 spin_lock_irq(&slave_active_lock);
196 slave->master = master;
197 slave->timer = master->timer;
198 spin_unlock_irq(&slave_active_lock);
199 return;
200 }
201 }
202 }
203}
204
205
206
207
208
209
210
211static void snd_timer_check_master(struct snd_timer_instance *master)
212{
213 struct snd_timer_instance *slave, *tmp;
214
215
216 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
217 if (slave->slave_class == master->slave_class &&
218 slave->slave_id == master->slave_id) {
219 list_move_tail(&slave->open_list, &master->slave_list_head);
220 spin_lock_irq(&slave_active_lock);
221 spin_lock(&master->timer->lock);
222 slave->master = master;
223 slave->timer = master->timer;
224 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
225 list_add_tail(&slave->active_list,
226 &master->slave_active_head);
227 spin_unlock(&master->timer->lock);
228 spin_unlock_irq(&slave_active_lock);
229 }
230 }
231}
232
233
234
235
236
237int snd_timer_open(struct snd_timer_instance **ti,
238 char *owner, struct snd_timer_id *tid,
239 unsigned int slave_id)
240{
241 struct snd_timer *timer;
242 struct snd_timer_instance *timeri = NULL;
243
244 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
245
246 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
247 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
248 pr_debug("ALSA: timer: invalid slave class %i\n",
249 tid->dev_sclass);
250 return -EINVAL;
251 }
252 mutex_lock(®ister_mutex);
253 timeri = snd_timer_instance_new(owner, NULL);
254 if (!timeri) {
255 mutex_unlock(®ister_mutex);
256 return -ENOMEM;
257 }
258 timeri->slave_class = tid->dev_sclass;
259 timeri->slave_id = tid->device;
260 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
261 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
262 snd_timer_check_slave(timeri);
263 mutex_unlock(®ister_mutex);
264 *ti = timeri;
265 return 0;
266 }
267
268
269 mutex_lock(®ister_mutex);
270 timer = snd_timer_find(tid);
271#ifdef CONFIG_MODULES
272 if (!timer) {
273 mutex_unlock(®ister_mutex);
274 snd_timer_request(tid);
275 mutex_lock(®ister_mutex);
276 timer = snd_timer_find(tid);
277 }
278#endif
279 if (!timer) {
280 mutex_unlock(®ister_mutex);
281 return -ENODEV;
282 }
283 if (!list_empty(&timer->open_list_head)) {
284 timeri = list_entry(timer->open_list_head.next,
285 struct snd_timer_instance, open_list);
286 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
287 mutex_unlock(®ister_mutex);
288 return -EBUSY;
289 }
290 }
291 timeri = snd_timer_instance_new(owner, timer);
292 if (!timeri) {
293 mutex_unlock(®ister_mutex);
294 return -ENOMEM;
295 }
296
297 if (timer->card)
298 get_device(&timer->card->card_dev);
299 timeri->slave_class = tid->dev_sclass;
300 timeri->slave_id = slave_id;
301
302 if (list_empty(&timer->open_list_head) && timer->hw.open) {
303 int err = timer->hw.open(timer);
304 if (err) {
305 kfree(timeri->owner);
306 kfree(timeri);
307
308 if (timer->card)
309 put_device(&timer->card->card_dev);
310 module_put(timer->module);
311 mutex_unlock(®ister_mutex);
312 return err;
313 }
314 }
315
316 list_add_tail(&timeri->open_list, &timer->open_list_head);
317 snd_timer_check_master(timeri);
318 mutex_unlock(®ister_mutex);
319 *ti = timeri;
320 return 0;
321}
322EXPORT_SYMBOL(snd_timer_open);
323
324
325
326
327int snd_timer_close(struct snd_timer_instance *timeri)
328{
329 struct snd_timer *timer = NULL;
330 struct snd_timer_instance *slave, *tmp;
331
332 if (snd_BUG_ON(!timeri))
333 return -ENXIO;
334
335 mutex_lock(®ister_mutex);
336 list_del(&timeri->open_list);
337
338
339 snd_timer_stop(timeri);
340
341 timer = timeri->timer;
342 if (timer) {
343
344 spin_lock_irq(&timer->lock);
345 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
346 spin_unlock_irq(&timer->lock);
347 udelay(10);
348 spin_lock_irq(&timer->lock);
349 }
350 spin_unlock_irq(&timer->lock);
351
352
353 spin_lock_irq(&slave_active_lock);
354 spin_lock(&timer->lock);
355 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
356 open_list) {
357 list_move_tail(&slave->open_list, &snd_timer_slave_list);
358 slave->master = NULL;
359 slave->timer = NULL;
360 list_del_init(&slave->ack_list);
361 list_del_init(&slave->active_list);
362 }
363 spin_unlock(&timer->lock);
364 spin_unlock_irq(&slave_active_lock);
365
366
367 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
368 timer = NULL;
369 }
370
371 if (timeri->private_free)
372 timeri->private_free(timeri);
373 kfree(timeri->owner);
374 kfree(timeri);
375
376 if (timer) {
377 if (list_empty(&timer->open_list_head) && timer->hw.close)
378 timer->hw.close(timer);
379
380 if (timer->card)
381 put_device(&timer->card->card_dev);
382 module_put(timer->module);
383 }
384
385 mutex_unlock(®ister_mutex);
386 return 0;
387}
388EXPORT_SYMBOL(snd_timer_close);
389
390unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
391{
392 struct snd_timer * timer;
393
394 if (timeri == NULL)
395 return 0;
396 if ((timer = timeri->timer) != NULL) {
397 if (timer->hw.c_resolution)
398 return timer->hw.c_resolution(timer);
399 return timer->hw.resolution;
400 }
401 return 0;
402}
403EXPORT_SYMBOL(snd_timer_resolution);
404
405static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
406{
407 struct snd_timer *timer;
408 unsigned long resolution = 0;
409 struct snd_timer_instance *ts;
410 struct timespec tstamp;
411
412 if (timer_tstamp_monotonic)
413 ktime_get_ts(&tstamp);
414 else
415 getnstimeofday(&tstamp);
416 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
417 event > SNDRV_TIMER_EVENT_PAUSE))
418 return;
419 if (event == SNDRV_TIMER_EVENT_START ||
420 event == SNDRV_TIMER_EVENT_CONTINUE)
421 resolution = snd_timer_resolution(ti);
422 if (ti->ccallback)
423 ti->ccallback(ti, event, &tstamp, resolution);
424 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
425 return;
426 timer = ti->timer;
427 if (timer == NULL)
428 return;
429 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
430 return;
431 list_for_each_entry(ts, &ti->slave_active_head, active_list)
432 if (ts->ccallback)
433 ts->ccallback(ts, event + 100, &tstamp, resolution);
434}
435
436
437static int snd_timer_start1(struct snd_timer_instance *timeri,
438 bool start, unsigned long ticks)
439{
440 struct snd_timer *timer;
441 int result;
442 unsigned long flags;
443
444 timer = timeri->timer;
445 if (!timer)
446 return -EINVAL;
447
448 spin_lock_irqsave(&timer->lock, flags);
449 if (timer->card && timer->card->shutdown) {
450 result = -ENODEV;
451 goto unlock;
452 }
453 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
454 SNDRV_TIMER_IFLG_START)) {
455 result = -EBUSY;
456 goto unlock;
457 }
458
459 if (start)
460 timeri->ticks = timeri->cticks = ticks;
461 else if (!timeri->cticks)
462 timeri->cticks = 1;
463 timeri->pticks = 0;
464
465 list_move_tail(&timeri->active_list, &timer->active_list_head);
466 if (timer->running) {
467 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
468 goto __start_now;
469 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
470 timeri->flags |= SNDRV_TIMER_IFLG_START;
471 result = 1;
472 } else {
473 if (start)
474 timer->sticks = ticks;
475 timer->hw.start(timer);
476 __start_now:
477 timer->running++;
478 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
479 result = 0;
480 }
481 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
482 SNDRV_TIMER_EVENT_CONTINUE);
483 unlock:
484 spin_unlock_irqrestore(&timer->lock, flags);
485 return result;
486}
487
488
489static int snd_timer_start_slave(struct snd_timer_instance *timeri,
490 bool start)
491{
492 unsigned long flags;
493
494 spin_lock_irqsave(&slave_active_lock, flags);
495 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
496 spin_unlock_irqrestore(&slave_active_lock, flags);
497 return -EBUSY;
498 }
499 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
500 if (timeri->master && timeri->timer) {
501 spin_lock(&timeri->timer->lock);
502 list_add_tail(&timeri->active_list,
503 &timeri->master->slave_active_head);
504 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
505 SNDRV_TIMER_EVENT_CONTINUE);
506 spin_unlock(&timeri->timer->lock);
507 }
508 spin_unlock_irqrestore(&slave_active_lock, flags);
509 return 1;
510}
511
512
513static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
514{
515 struct snd_timer *timer;
516 int result = 0;
517 unsigned long flags;
518
519 timer = timeri->timer;
520 if (!timer)
521 return -EINVAL;
522 spin_lock_irqsave(&timer->lock, flags);
523 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
524 SNDRV_TIMER_IFLG_START))) {
525 result = -EBUSY;
526 goto unlock;
527 }
528 list_del_init(&timeri->ack_list);
529 list_del_init(&timeri->active_list);
530 if (timer->card && timer->card->shutdown)
531 goto unlock;
532 if (stop) {
533 timeri->cticks = timeri->ticks;
534 timeri->pticks = 0;
535 }
536 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
537 !(--timer->running)) {
538 timer->hw.stop(timer);
539 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
540 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
541 snd_timer_reschedule(timer, 0);
542 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
543 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
544 timer->hw.start(timer);
545 }
546 }
547 }
548 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
549 if (stop)
550 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
551 else
552 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
553 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
554 SNDRV_TIMER_EVENT_CONTINUE);
555 unlock:
556 spin_unlock_irqrestore(&timer->lock, flags);
557 return result;
558}
559
560
561static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
562{
563 unsigned long flags;
564
565 spin_lock_irqsave(&slave_active_lock, flags);
566 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
567 spin_unlock_irqrestore(&slave_active_lock, flags);
568 return -EBUSY;
569 }
570 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
571 if (timeri->timer) {
572 spin_lock(&timeri->timer->lock);
573 list_del_init(&timeri->ack_list);
574 list_del_init(&timeri->active_list);
575 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
576 SNDRV_TIMER_EVENT_CONTINUE);
577 spin_unlock(&timeri->timer->lock);
578 }
579 spin_unlock_irqrestore(&slave_active_lock, flags);
580 return 0;
581}
582
583
584
585
586int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
587{
588 if (timeri == NULL || ticks < 1)
589 return -EINVAL;
590 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
591 return snd_timer_start_slave(timeri, true);
592 else
593 return snd_timer_start1(timeri, true, ticks);
594}
595EXPORT_SYMBOL(snd_timer_start);
596
597
598
599
600
601
602int snd_timer_stop(struct snd_timer_instance *timeri)
603{
604 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
605 return snd_timer_stop_slave(timeri, true);
606 else
607 return snd_timer_stop1(timeri, true);
608}
609EXPORT_SYMBOL(snd_timer_stop);
610
611
612
613
614int snd_timer_continue(struct snd_timer_instance *timeri)
615{
616
617 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
618 return -EINVAL;
619
620 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
621 return snd_timer_start_slave(timeri, false);
622 else
623 return snd_timer_start1(timeri, false, 0);
624}
625EXPORT_SYMBOL(snd_timer_continue);
626
627
628
629
630int snd_timer_pause(struct snd_timer_instance * timeri)
631{
632 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
633 return snd_timer_stop_slave(timeri, false);
634 else
635 return snd_timer_stop1(timeri, false);
636}
637EXPORT_SYMBOL(snd_timer_pause);
638
639
640
641
642
643
644
645static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
646{
647 struct snd_timer_instance *ti;
648 unsigned long ticks = ~0UL;
649
650 list_for_each_entry(ti, &timer->active_list_head, active_list) {
651 if (ti->flags & SNDRV_TIMER_IFLG_START) {
652 ti->flags &= ~SNDRV_TIMER_IFLG_START;
653 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
654 timer->running++;
655 }
656 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
657 if (ticks > ti->cticks)
658 ticks = ti->cticks;
659 }
660 }
661 if (ticks == ~0UL) {
662 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
663 return;
664 }
665 if (ticks > timer->hw.ticks)
666 ticks = timer->hw.ticks;
667 if (ticks_left != ticks)
668 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
669 timer->sticks = ticks;
670}
671
672
673
674
675
676static void snd_timer_tasklet(unsigned long arg)
677{
678 struct snd_timer *timer = (struct snd_timer *) arg;
679 struct snd_timer_instance *ti;
680 struct list_head *p;
681 unsigned long resolution, ticks;
682 unsigned long flags;
683
684 if (timer->card && timer->card->shutdown)
685 return;
686
687 spin_lock_irqsave(&timer->lock, flags);
688
689 while (!list_empty(&timer->sack_list_head)) {
690 p = timer->sack_list_head.next;
691 ti = list_entry(p, struct snd_timer_instance, ack_list);
692
693
694 list_del_init(p);
695
696 ticks = ti->pticks;
697 ti->pticks = 0;
698 resolution = ti->resolution;
699
700 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
701 spin_unlock(&timer->lock);
702 if (ti->callback)
703 ti->callback(ti, resolution, ticks);
704 spin_lock(&timer->lock);
705 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
706 }
707 spin_unlock_irqrestore(&timer->lock, flags);
708}
709
710
711
712
713
714
715
716void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
717{
718 struct snd_timer_instance *ti, *ts, *tmp;
719 unsigned long resolution, ticks;
720 struct list_head *p, *ack_list_head;
721 unsigned long flags;
722 int use_tasklet = 0;
723
724 if (timer == NULL)
725 return;
726
727 if (timer->card && timer->card->shutdown)
728 return;
729
730 spin_lock_irqsave(&timer->lock, flags);
731
732
733 if (timer->hw.c_resolution)
734 resolution = timer->hw.c_resolution(timer);
735 else
736 resolution = timer->hw.resolution;
737
738
739
740
741
742
743 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
744 active_list) {
745 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
746 continue;
747 ti->pticks += ticks_left;
748 ti->resolution = resolution;
749 if (ti->cticks < ticks_left)
750 ti->cticks = 0;
751 else
752 ti->cticks -= ticks_left;
753 if (ti->cticks)
754 continue;
755 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
756 ti->cticks = ti->ticks;
757 } else {
758 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
759 --timer->running;
760 list_del_init(&ti->active_list);
761 }
762 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
763 (ti->flags & SNDRV_TIMER_IFLG_FAST))
764 ack_list_head = &timer->ack_list_head;
765 else
766 ack_list_head = &timer->sack_list_head;
767 if (list_empty(&ti->ack_list))
768 list_add_tail(&ti->ack_list, ack_list_head);
769 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
770 ts->pticks = ti->pticks;
771 ts->resolution = resolution;
772 if (list_empty(&ts->ack_list))
773 list_add_tail(&ts->ack_list, ack_list_head);
774 }
775 }
776 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
777 snd_timer_reschedule(timer, timer->sticks);
778 if (timer->running) {
779 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
780 timer->hw.stop(timer);
781 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
782 }
783 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
784 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
785
786 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
787 timer->hw.start(timer);
788 }
789 } else {
790 timer->hw.stop(timer);
791 }
792
793
794 while (!list_empty(&timer->ack_list_head)) {
795 p = timer->ack_list_head.next;
796 ti = list_entry(p, struct snd_timer_instance, ack_list);
797
798
799 list_del_init(p);
800
801 ticks = ti->pticks;
802 ti->pticks = 0;
803
804 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
805 spin_unlock(&timer->lock);
806 if (ti->callback)
807 ti->callback(ti, resolution, ticks);
808 spin_lock(&timer->lock);
809 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
810 }
811
812
813 use_tasklet = !list_empty(&timer->sack_list_head);
814 spin_unlock_irqrestore(&timer->lock, flags);
815
816 if (use_tasklet)
817 tasklet_schedule(&timer->task_queue);
818}
819EXPORT_SYMBOL(snd_timer_interrupt);
820
821
822
823
824
825int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
826 struct snd_timer **rtimer)
827{
828 struct snd_timer *timer;
829 int err;
830 static struct snd_device_ops ops = {
831 .dev_free = snd_timer_dev_free,
832 .dev_register = snd_timer_dev_register,
833 .dev_disconnect = snd_timer_dev_disconnect,
834 };
835
836 if (snd_BUG_ON(!tid))
837 return -EINVAL;
838 if (rtimer)
839 *rtimer = NULL;
840 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
841 if (!timer)
842 return -ENOMEM;
843 timer->tmr_class = tid->dev_class;
844 timer->card = card;
845 timer->tmr_device = tid->device;
846 timer->tmr_subdevice = tid->subdevice;
847 if (id)
848 strlcpy(timer->id, id, sizeof(timer->id));
849 timer->sticks = 1;
850 INIT_LIST_HEAD(&timer->device_list);
851 INIT_LIST_HEAD(&timer->open_list_head);
852 INIT_LIST_HEAD(&timer->active_list_head);
853 INIT_LIST_HEAD(&timer->ack_list_head);
854 INIT_LIST_HEAD(&timer->sack_list_head);
855 spin_lock_init(&timer->lock);
856 tasklet_init(&timer->task_queue, snd_timer_tasklet,
857 (unsigned long)timer);
858 if (card != NULL) {
859 timer->module = card->module;
860 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
861 if (err < 0) {
862 snd_timer_free(timer);
863 return err;
864 }
865 }
866 if (rtimer)
867 *rtimer = timer;
868 return 0;
869}
870EXPORT_SYMBOL(snd_timer_new);
871
872static int snd_timer_free(struct snd_timer *timer)
873{
874 if (!timer)
875 return 0;
876
877 mutex_lock(®ister_mutex);
878 if (! list_empty(&timer->open_list_head)) {
879 struct list_head *p, *n;
880 struct snd_timer_instance *ti;
881 pr_warn("ALSA: timer %p is busy?\n", timer);
882 list_for_each_safe(p, n, &timer->open_list_head) {
883 list_del_init(p);
884 ti = list_entry(p, struct snd_timer_instance, open_list);
885 ti->timer = NULL;
886 }
887 }
888 list_del(&timer->device_list);
889 mutex_unlock(®ister_mutex);
890
891 if (timer->private_free)
892 timer->private_free(timer);
893 kfree(timer);
894 return 0;
895}
896
897static int snd_timer_dev_free(struct snd_device *device)
898{
899 struct snd_timer *timer = device->device_data;
900 return snd_timer_free(timer);
901}
902
903static int snd_timer_dev_register(struct snd_device *dev)
904{
905 struct snd_timer *timer = dev->device_data;
906 struct snd_timer *timer1;
907
908 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
909 return -ENXIO;
910 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
911 !timer->hw.resolution && timer->hw.c_resolution == NULL)
912 return -EINVAL;
913
914 mutex_lock(®ister_mutex);
915 list_for_each_entry(timer1, &snd_timer_list, device_list) {
916 if (timer1->tmr_class > timer->tmr_class)
917 break;
918 if (timer1->tmr_class < timer->tmr_class)
919 continue;
920 if (timer1->card && timer->card) {
921 if (timer1->card->number > timer->card->number)
922 break;
923 if (timer1->card->number < timer->card->number)
924 continue;
925 }
926 if (timer1->tmr_device > timer->tmr_device)
927 break;
928 if (timer1->tmr_device < timer->tmr_device)
929 continue;
930 if (timer1->tmr_subdevice > timer->tmr_subdevice)
931 break;
932 if (timer1->tmr_subdevice < timer->tmr_subdevice)
933 continue;
934
935 mutex_unlock(®ister_mutex);
936 return -EBUSY;
937 }
938 list_add_tail(&timer->device_list, &timer1->device_list);
939 mutex_unlock(®ister_mutex);
940 return 0;
941}
942
943static int snd_timer_dev_disconnect(struct snd_device *device)
944{
945 struct snd_timer *timer = device->device_data;
946 struct snd_timer_instance *ti;
947
948 mutex_lock(®ister_mutex);
949 list_del_init(&timer->device_list);
950
951 list_for_each_entry(ti, &timer->open_list_head, open_list) {
952 if (ti->disconnect)
953 ti->disconnect(ti);
954 }
955 mutex_unlock(®ister_mutex);
956 return 0;
957}
958
959void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
960{
961 unsigned long flags;
962 unsigned long resolution = 0;
963 struct snd_timer_instance *ti, *ts;
964
965 if (timer->card && timer->card->shutdown)
966 return;
967 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
968 return;
969 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
970 event > SNDRV_TIMER_EVENT_MRESUME))
971 return;
972 spin_lock_irqsave(&timer->lock, flags);
973 if (event == SNDRV_TIMER_EVENT_MSTART ||
974 event == SNDRV_TIMER_EVENT_MCONTINUE ||
975 event == SNDRV_TIMER_EVENT_MRESUME) {
976 if (timer->hw.c_resolution)
977 resolution = timer->hw.c_resolution(timer);
978 else
979 resolution = timer->hw.resolution;
980 }
981 list_for_each_entry(ti, &timer->active_list_head, active_list) {
982 if (ti->ccallback)
983 ti->ccallback(ti, event, tstamp, resolution);
984 list_for_each_entry(ts, &ti->slave_active_head, active_list)
985 if (ts->ccallback)
986 ts->ccallback(ts, event, tstamp, resolution);
987 }
988 spin_unlock_irqrestore(&timer->lock, flags);
989}
990EXPORT_SYMBOL(snd_timer_notify);
991
992
993
994
995int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
996{
997 struct snd_timer_id tid;
998
999 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1000 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1001 tid.card = -1;
1002 tid.device = device;
1003 tid.subdevice = 0;
1004 return snd_timer_new(NULL, id, &tid, rtimer);
1005}
1006EXPORT_SYMBOL(snd_timer_global_new);
1007
1008int snd_timer_global_free(struct snd_timer *timer)
1009{
1010 return snd_timer_free(timer);
1011}
1012EXPORT_SYMBOL(snd_timer_global_free);
1013
1014int snd_timer_global_register(struct snd_timer *timer)
1015{
1016 struct snd_device dev;
1017
1018 memset(&dev, 0, sizeof(dev));
1019 dev.device_data = timer;
1020 return snd_timer_dev_register(&dev);
1021}
1022EXPORT_SYMBOL(snd_timer_global_register);
1023
1024
1025
1026
1027
1028struct snd_timer_system_private {
1029 struct timer_list tlist;
1030 unsigned long last_expires;
1031 unsigned long last_jiffies;
1032 unsigned long correction;
1033};
1034
1035static void snd_timer_s_function(unsigned long data)
1036{
1037 struct snd_timer *timer = (struct snd_timer *)data;
1038 struct snd_timer_system_private *priv = timer->private_data;
1039 unsigned long jiff = jiffies;
1040 if (time_after(jiff, priv->last_expires))
1041 priv->correction += (long)jiff - (long)priv->last_expires;
1042 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1043}
1044
1045static int snd_timer_s_start(struct snd_timer * timer)
1046{
1047 struct snd_timer_system_private *priv;
1048 unsigned long njiff;
1049
1050 priv = (struct snd_timer_system_private *) timer->private_data;
1051 njiff = (priv->last_jiffies = jiffies);
1052 if (priv->correction > timer->sticks - 1) {
1053 priv->correction -= timer->sticks - 1;
1054 njiff++;
1055 } else {
1056 njiff += timer->sticks - priv->correction;
1057 priv->correction = 0;
1058 }
1059 priv->last_expires = njiff;
1060 mod_timer(&priv->tlist, njiff);
1061 return 0;
1062}
1063
1064static int snd_timer_s_stop(struct snd_timer * timer)
1065{
1066 struct snd_timer_system_private *priv;
1067 unsigned long jiff;
1068
1069 priv = (struct snd_timer_system_private *) timer->private_data;
1070 del_timer(&priv->tlist);
1071 jiff = jiffies;
1072 if (time_before(jiff, priv->last_expires))
1073 timer->sticks = priv->last_expires - jiff;
1074 else
1075 timer->sticks = 1;
1076 priv->correction = 0;
1077 return 0;
1078}
1079
1080static int snd_timer_s_close(struct snd_timer *timer)
1081{
1082 struct snd_timer_system_private *priv;
1083
1084 priv = (struct snd_timer_system_private *)timer->private_data;
1085 del_timer_sync(&priv->tlist);
1086 return 0;
1087}
1088
1089static struct snd_timer_hardware snd_timer_system =
1090{
1091 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1092 .resolution = 1000000000L / HZ,
1093 .ticks = 10000000L,
1094 .close = snd_timer_s_close,
1095 .start = snd_timer_s_start,
1096 .stop = snd_timer_s_stop
1097};
1098
1099static void snd_timer_free_system(struct snd_timer *timer)
1100{
1101 kfree(timer->private_data);
1102}
1103
1104static int snd_timer_register_system(void)
1105{
1106 struct snd_timer *timer;
1107 struct snd_timer_system_private *priv;
1108 int err;
1109
1110 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1111 if (err < 0)
1112 return err;
1113 strcpy(timer->name, "system timer");
1114 timer->hw = snd_timer_system;
1115 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1116 if (priv == NULL) {
1117 snd_timer_free(timer);
1118 return -ENOMEM;
1119 }
1120 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1121 timer->private_data = priv;
1122 timer->private_free = snd_timer_free_system;
1123 return snd_timer_global_register(timer);
1124}
1125
1126#ifdef CONFIG_SND_PROC_FS
1127
1128
1129
1130
1131static void snd_timer_proc_read(struct snd_info_entry *entry,
1132 struct snd_info_buffer *buffer)
1133{
1134 struct snd_timer *timer;
1135 struct snd_timer_instance *ti;
1136
1137 mutex_lock(®ister_mutex);
1138 list_for_each_entry(timer, &snd_timer_list, device_list) {
1139 if (timer->card && timer->card->shutdown)
1140 continue;
1141 switch (timer->tmr_class) {
1142 case SNDRV_TIMER_CLASS_GLOBAL:
1143 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1144 break;
1145 case SNDRV_TIMER_CLASS_CARD:
1146 snd_iprintf(buffer, "C%i-%i: ",
1147 timer->card->number, timer->tmr_device);
1148 break;
1149 case SNDRV_TIMER_CLASS_PCM:
1150 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1151 timer->tmr_device, timer->tmr_subdevice);
1152 break;
1153 default:
1154 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1155 timer->card ? timer->card->number : -1,
1156 timer->tmr_device, timer->tmr_subdevice);
1157 }
1158 snd_iprintf(buffer, "%s :", timer->name);
1159 if (timer->hw.resolution)
1160 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1161 timer->hw.resolution / 1000,
1162 timer->hw.resolution % 1000,
1163 timer->hw.ticks);
1164 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1165 snd_iprintf(buffer, " SLAVE");
1166 snd_iprintf(buffer, "\n");
1167 list_for_each_entry(ti, &timer->open_list_head, open_list)
1168 snd_iprintf(buffer, " Client %s : %s\n",
1169 ti->owner ? ti->owner : "unknown",
1170 ti->flags & (SNDRV_TIMER_IFLG_START |
1171 SNDRV_TIMER_IFLG_RUNNING)
1172 ? "running" : "stopped");
1173 }
1174 mutex_unlock(®ister_mutex);
1175}
1176
1177static struct snd_info_entry *snd_timer_proc_entry;
1178
1179static void __init snd_timer_proc_init(void)
1180{
1181 struct snd_info_entry *entry;
1182
1183 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1184 if (entry != NULL) {
1185 entry->c.text.read = snd_timer_proc_read;
1186 if (snd_info_register(entry) < 0) {
1187 snd_info_free_entry(entry);
1188 entry = NULL;
1189 }
1190 }
1191 snd_timer_proc_entry = entry;
1192}
1193
1194static void __exit snd_timer_proc_done(void)
1195{
1196 snd_info_free_entry(snd_timer_proc_entry);
1197}
1198#else
1199#define snd_timer_proc_init()
1200#define snd_timer_proc_done()
1201#endif
1202
1203
1204
1205
1206
1207static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1208 unsigned long resolution,
1209 unsigned long ticks)
1210{
1211 struct snd_timer_user *tu = timeri->callback_data;
1212 struct snd_timer_read *r;
1213 int prev;
1214
1215 spin_lock(&tu->qlock);
1216 if (tu->qused > 0) {
1217 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1218 r = &tu->queue[prev];
1219 if (r->resolution == resolution) {
1220 r->ticks += ticks;
1221 goto __wake;
1222 }
1223 }
1224 if (tu->qused >= tu->queue_size) {
1225 tu->overrun++;
1226 } else {
1227 r = &tu->queue[tu->qtail++];
1228 tu->qtail %= tu->queue_size;
1229 r->resolution = resolution;
1230 r->ticks = ticks;
1231 tu->qused++;
1232 }
1233 __wake:
1234 spin_unlock(&tu->qlock);
1235 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1236 wake_up(&tu->qchange_sleep);
1237}
1238
1239static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1240 struct snd_timer_tread *tread)
1241{
1242 if (tu->qused >= tu->queue_size) {
1243 tu->overrun++;
1244 } else {
1245 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1246 tu->qtail %= tu->queue_size;
1247 tu->qused++;
1248 }
1249}
1250
1251static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1252 int event,
1253 struct timespec *tstamp,
1254 unsigned long resolution)
1255{
1256 struct snd_timer_user *tu = timeri->callback_data;
1257 struct snd_timer_tread r1;
1258 unsigned long flags;
1259
1260 if (event >= SNDRV_TIMER_EVENT_START &&
1261 event <= SNDRV_TIMER_EVENT_PAUSE)
1262 tu->tstamp = *tstamp;
1263 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1264 return;
1265 memset(&r1, 0, sizeof(r1));
1266 r1.event = event;
1267 r1.tstamp = *tstamp;
1268 r1.val = resolution;
1269 spin_lock_irqsave(&tu->qlock, flags);
1270 snd_timer_user_append_to_tqueue(tu, &r1);
1271 spin_unlock_irqrestore(&tu->qlock, flags);
1272 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1273 wake_up(&tu->qchange_sleep);
1274}
1275
1276static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1277{
1278 struct snd_timer_user *tu = timeri->callback_data;
1279
1280 tu->disconnected = true;
1281 wake_up(&tu->qchange_sleep);
1282}
1283
1284static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1285 unsigned long resolution,
1286 unsigned long ticks)
1287{
1288 struct snd_timer_user *tu = timeri->callback_data;
1289 struct snd_timer_tread *r, r1;
1290 struct timespec tstamp;
1291 int prev, append = 0;
1292
1293 memset(&r1, 0, sizeof(r1));
1294 memset(&tstamp, 0, sizeof(tstamp));
1295 spin_lock(&tu->qlock);
1296 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1297 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1298 spin_unlock(&tu->qlock);
1299 return;
1300 }
1301 if (tu->last_resolution != resolution || ticks > 0) {
1302 if (timer_tstamp_monotonic)
1303 ktime_get_ts(&tstamp);
1304 else
1305 getnstimeofday(&tstamp);
1306 }
1307 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1308 tu->last_resolution != resolution) {
1309 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1310 r1.tstamp = tstamp;
1311 r1.val = resolution;
1312 snd_timer_user_append_to_tqueue(tu, &r1);
1313 tu->last_resolution = resolution;
1314 append++;
1315 }
1316 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1317 goto __wake;
1318 if (ticks == 0)
1319 goto __wake;
1320 if (tu->qused > 0) {
1321 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1322 r = &tu->tqueue[prev];
1323 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1324 r->tstamp = tstamp;
1325 r->val += ticks;
1326 append++;
1327 goto __wake;
1328 }
1329 }
1330 r1.event = SNDRV_TIMER_EVENT_TICK;
1331 r1.tstamp = tstamp;
1332 r1.val = ticks;
1333 snd_timer_user_append_to_tqueue(tu, &r1);
1334 append++;
1335 __wake:
1336 spin_unlock(&tu->qlock);
1337 if (append == 0)
1338 return;
1339 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1340 wake_up(&tu->qchange_sleep);
1341}
1342
1343static int realloc_user_queue(struct snd_timer_user *tu, int size)
1344{
1345 struct snd_timer_read *queue = NULL;
1346 struct snd_timer_tread *tqueue = NULL;
1347
1348 if (tu->tread) {
1349 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1350 if (!tqueue)
1351 return -ENOMEM;
1352 } else {
1353 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1354 if (!queue)
1355 return -ENOMEM;
1356 }
1357
1358 spin_lock_irq(&tu->qlock);
1359 kfree(tu->queue);
1360 kfree(tu->tqueue);
1361 tu->queue_size = size;
1362 tu->queue = queue;
1363 tu->tqueue = tqueue;
1364 tu->qhead = tu->qtail = tu->qused = 0;
1365 spin_unlock_irq(&tu->qlock);
1366
1367 return 0;
1368}
1369
1370static int snd_timer_user_open(struct inode *inode, struct file *file)
1371{
1372 struct snd_timer_user *tu;
1373 int err;
1374
1375 err = nonseekable_open(inode, file);
1376 if (err < 0)
1377 return err;
1378
1379 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1380 if (tu == NULL)
1381 return -ENOMEM;
1382 spin_lock_init(&tu->qlock);
1383 init_waitqueue_head(&tu->qchange_sleep);
1384 mutex_init(&tu->ioctl_lock);
1385 tu->ticks = 1;
1386 if (realloc_user_queue(tu, 128) < 0) {
1387 kfree(tu);
1388 return -ENOMEM;
1389 }
1390 file->private_data = tu;
1391 return 0;
1392}
1393
1394static int snd_timer_user_release(struct inode *inode, struct file *file)
1395{
1396 struct snd_timer_user *tu;
1397
1398 if (file->private_data) {
1399 tu = file->private_data;
1400 file->private_data = NULL;
1401 mutex_lock(&tu->ioctl_lock);
1402 if (tu->timeri)
1403 snd_timer_close(tu->timeri);
1404 mutex_unlock(&tu->ioctl_lock);
1405 kfree(tu->queue);
1406 kfree(tu->tqueue);
1407 kfree(tu);
1408 }
1409 return 0;
1410}
1411
1412static void snd_timer_user_zero_id(struct snd_timer_id *id)
1413{
1414 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1415 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1416 id->card = -1;
1417 id->device = -1;
1418 id->subdevice = -1;
1419}
1420
1421static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1422{
1423 id->dev_class = timer->tmr_class;
1424 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1425 id->card = timer->card ? timer->card->number : -1;
1426 id->device = timer->tmr_device;
1427 id->subdevice = timer->tmr_subdevice;
1428}
1429
1430static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1431{
1432 struct snd_timer_id id;
1433 struct snd_timer *timer;
1434 struct list_head *p;
1435
1436 if (copy_from_user(&id, _tid, sizeof(id)))
1437 return -EFAULT;
1438 mutex_lock(®ister_mutex);
1439 if (id.dev_class < 0) {
1440 if (list_empty(&snd_timer_list))
1441 snd_timer_user_zero_id(&id);
1442 else {
1443 timer = list_entry(snd_timer_list.next,
1444 struct snd_timer, device_list);
1445 snd_timer_user_copy_id(&id, timer);
1446 }
1447 } else {
1448 switch (id.dev_class) {
1449 case SNDRV_TIMER_CLASS_GLOBAL:
1450 id.device = id.device < 0 ? 0 : id.device + 1;
1451 list_for_each(p, &snd_timer_list) {
1452 timer = list_entry(p, struct snd_timer, device_list);
1453 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1454 snd_timer_user_copy_id(&id, timer);
1455 break;
1456 }
1457 if (timer->tmr_device >= id.device) {
1458 snd_timer_user_copy_id(&id, timer);
1459 break;
1460 }
1461 }
1462 if (p == &snd_timer_list)
1463 snd_timer_user_zero_id(&id);
1464 break;
1465 case SNDRV_TIMER_CLASS_CARD:
1466 case SNDRV_TIMER_CLASS_PCM:
1467 if (id.card < 0) {
1468 id.card = 0;
1469 } else {
1470 if (id.device < 0) {
1471 id.device = 0;
1472 } else {
1473 if (id.subdevice < 0)
1474 id.subdevice = 0;
1475 else
1476 id.subdevice++;
1477 }
1478 }
1479 list_for_each(p, &snd_timer_list) {
1480 timer = list_entry(p, struct snd_timer, device_list);
1481 if (timer->tmr_class > id.dev_class) {
1482 snd_timer_user_copy_id(&id, timer);
1483 break;
1484 }
1485 if (timer->tmr_class < id.dev_class)
1486 continue;
1487 if (timer->card->number > id.card) {
1488 snd_timer_user_copy_id(&id, timer);
1489 break;
1490 }
1491 if (timer->card->number < id.card)
1492 continue;
1493 if (timer->tmr_device > id.device) {
1494 snd_timer_user_copy_id(&id, timer);
1495 break;
1496 }
1497 if (timer->tmr_device < id.device)
1498 continue;
1499 if (timer->tmr_subdevice > id.subdevice) {
1500 snd_timer_user_copy_id(&id, timer);
1501 break;
1502 }
1503 if (timer->tmr_subdevice < id.subdevice)
1504 continue;
1505 snd_timer_user_copy_id(&id, timer);
1506 break;
1507 }
1508 if (p == &snd_timer_list)
1509 snd_timer_user_zero_id(&id);
1510 break;
1511 default:
1512 snd_timer_user_zero_id(&id);
1513 }
1514 }
1515 mutex_unlock(®ister_mutex);
1516 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1517 return -EFAULT;
1518 return 0;
1519}
1520
1521static int snd_timer_user_ginfo(struct file *file,
1522 struct snd_timer_ginfo __user *_ginfo)
1523{
1524 struct snd_timer_ginfo *ginfo;
1525 struct snd_timer_id tid;
1526 struct snd_timer *t;
1527 struct list_head *p;
1528 int err = 0;
1529
1530 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1531 if (IS_ERR(ginfo))
1532 return PTR_ERR(ginfo);
1533
1534 tid = ginfo->tid;
1535 memset(ginfo, 0, sizeof(*ginfo));
1536 ginfo->tid = tid;
1537 mutex_lock(®ister_mutex);
1538 t = snd_timer_find(&tid);
1539 if (t != NULL) {
1540 ginfo->card = t->card ? t->card->number : -1;
1541 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1542 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1543 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1544 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1545 ginfo->resolution = t->hw.resolution;
1546 if (t->hw.resolution_min > 0) {
1547 ginfo->resolution_min = t->hw.resolution_min;
1548 ginfo->resolution_max = t->hw.resolution_max;
1549 }
1550 list_for_each(p, &t->open_list_head) {
1551 ginfo->clients++;
1552 }
1553 } else {
1554 err = -ENODEV;
1555 }
1556 mutex_unlock(®ister_mutex);
1557 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1558 err = -EFAULT;
1559 kfree(ginfo);
1560 return err;
1561}
1562
1563static int timer_set_gparams(struct snd_timer_gparams *gparams)
1564{
1565 struct snd_timer *t;
1566 int err;
1567
1568 mutex_lock(®ister_mutex);
1569 t = snd_timer_find(&gparams->tid);
1570 if (!t) {
1571 err = -ENODEV;
1572 goto _error;
1573 }
1574 if (!list_empty(&t->open_list_head)) {
1575 err = -EBUSY;
1576 goto _error;
1577 }
1578 if (!t->hw.set_period) {
1579 err = -ENOSYS;
1580 goto _error;
1581 }
1582 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1583_error:
1584 mutex_unlock(®ister_mutex);
1585 return err;
1586}
1587
1588static int snd_timer_user_gparams(struct file *file,
1589 struct snd_timer_gparams __user *_gparams)
1590{
1591 struct snd_timer_gparams gparams;
1592
1593 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1594 return -EFAULT;
1595 return timer_set_gparams(&gparams);
1596}
1597
1598static int snd_timer_user_gstatus(struct file *file,
1599 struct snd_timer_gstatus __user *_gstatus)
1600{
1601 struct snd_timer_gstatus gstatus;
1602 struct snd_timer_id tid;
1603 struct snd_timer *t;
1604 int err = 0;
1605
1606 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1607 return -EFAULT;
1608 tid = gstatus.tid;
1609 memset(&gstatus, 0, sizeof(gstatus));
1610 gstatus.tid = tid;
1611 mutex_lock(®ister_mutex);
1612 t = snd_timer_find(&tid);
1613 if (t != NULL) {
1614 if (t->hw.c_resolution)
1615 gstatus.resolution = t->hw.c_resolution(t);
1616 else
1617 gstatus.resolution = t->hw.resolution;
1618 if (t->hw.precise_resolution) {
1619 t->hw.precise_resolution(t, &gstatus.resolution_num,
1620 &gstatus.resolution_den);
1621 } else {
1622 gstatus.resolution_num = gstatus.resolution;
1623 gstatus.resolution_den = 1000000000uL;
1624 }
1625 } else {
1626 err = -ENODEV;
1627 }
1628 mutex_unlock(®ister_mutex);
1629 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1630 err = -EFAULT;
1631 return err;
1632}
1633
1634static int snd_timer_user_tselect(struct file *file,
1635 struct snd_timer_select __user *_tselect)
1636{
1637 struct snd_timer_user *tu;
1638 struct snd_timer_select tselect;
1639 char str[32];
1640 int err = 0;
1641
1642 tu = file->private_data;
1643 if (tu->timeri) {
1644 snd_timer_close(tu->timeri);
1645 tu->timeri = NULL;
1646 }
1647 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1648 err = -EFAULT;
1649 goto __err;
1650 }
1651 sprintf(str, "application %i", current->pid);
1652 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1653 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1654 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1655 if (err < 0)
1656 goto __err;
1657
1658 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1659 tu->timeri->callback = tu->tread
1660 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1661 tu->timeri->ccallback = snd_timer_user_ccallback;
1662 tu->timeri->callback_data = (void *)tu;
1663 tu->timeri->disconnect = snd_timer_user_disconnect;
1664
1665 __err:
1666 return err;
1667}
1668
1669static int snd_timer_user_info(struct file *file,
1670 struct snd_timer_info __user *_info)
1671{
1672 struct snd_timer_user *tu;
1673 struct snd_timer_info *info;
1674 struct snd_timer *t;
1675 int err = 0;
1676
1677 tu = file->private_data;
1678 if (!tu->timeri)
1679 return -EBADFD;
1680 t = tu->timeri->timer;
1681 if (!t)
1682 return -EBADFD;
1683
1684 info = kzalloc(sizeof(*info), GFP_KERNEL);
1685 if (! info)
1686 return -ENOMEM;
1687 info->card = t->card ? t->card->number : -1;
1688 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1689 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1690 strlcpy(info->id, t->id, sizeof(info->id));
1691 strlcpy(info->name, t->name, sizeof(info->name));
1692 info->resolution = t->hw.resolution;
1693 if (copy_to_user(_info, info, sizeof(*_info)))
1694 err = -EFAULT;
1695 kfree(info);
1696 return err;
1697}
1698
1699static int snd_timer_user_params(struct file *file,
1700 struct snd_timer_params __user *_params)
1701{
1702 struct snd_timer_user *tu;
1703 struct snd_timer_params params;
1704 struct snd_timer *t;
1705 int err;
1706
1707 tu = file->private_data;
1708 if (!tu->timeri)
1709 return -EBADFD;
1710 t = tu->timeri->timer;
1711 if (!t)
1712 return -EBADFD;
1713 if (copy_from_user(¶ms, _params, sizeof(params)))
1714 return -EFAULT;
1715 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1716 u64 resolution;
1717
1718 if (params.ticks < 1) {
1719 err = -EINVAL;
1720 goto _end;
1721 }
1722
1723
1724 resolution = snd_timer_resolution(tu->timeri);
1725 resolution *= params.ticks;
1726 if (resolution < 1000000) {
1727 err = -EINVAL;
1728 goto _end;
1729 }
1730 }
1731 if (params.queue_size > 0 &&
1732 (params.queue_size < 32 || params.queue_size > 1024)) {
1733 err = -EINVAL;
1734 goto _end;
1735 }
1736 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1737 (1<<SNDRV_TIMER_EVENT_TICK)|
1738 (1<<SNDRV_TIMER_EVENT_START)|
1739 (1<<SNDRV_TIMER_EVENT_STOP)|
1740 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1741 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1742 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1743 (1<<SNDRV_TIMER_EVENT_RESUME)|
1744 (1<<SNDRV_TIMER_EVENT_MSTART)|
1745 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1746 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1747 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1748 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1749 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1750 err = -EINVAL;
1751 goto _end;
1752 }
1753 snd_timer_stop(tu->timeri);
1754 spin_lock_irq(&t->lock);
1755 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1756 SNDRV_TIMER_IFLG_EXCLUSIVE|
1757 SNDRV_TIMER_IFLG_EARLY_EVENT);
1758 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1759 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1760 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1761 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1762 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1763 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1764 spin_unlock_irq(&t->lock);
1765 if (params.queue_size > 0 &&
1766 (unsigned int)tu->queue_size != params.queue_size) {
1767 err = realloc_user_queue(tu, params.queue_size);
1768 if (err < 0)
1769 goto _end;
1770 }
1771 spin_lock_irq(&tu->qlock);
1772 tu->qhead = tu->qtail = tu->qused = 0;
1773 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1774 if (tu->tread) {
1775 struct snd_timer_tread tread;
1776 memset(&tread, 0, sizeof(tread));
1777 tread.event = SNDRV_TIMER_EVENT_EARLY;
1778 tread.tstamp.tv_sec = 0;
1779 tread.tstamp.tv_nsec = 0;
1780 tread.val = 0;
1781 snd_timer_user_append_to_tqueue(tu, &tread);
1782 } else {
1783 struct snd_timer_read *r = &tu->queue[0];
1784 r->resolution = 0;
1785 r->ticks = 0;
1786 tu->qused++;
1787 tu->qtail++;
1788 }
1789 }
1790 tu->filter = params.filter;
1791 tu->ticks = params.ticks;
1792 spin_unlock_irq(&tu->qlock);
1793 err = 0;
1794 _end:
1795 if (copy_to_user(_params, ¶ms, sizeof(params)))
1796 return -EFAULT;
1797 return err;
1798}
1799
1800static int snd_timer_user_status(struct file *file,
1801 struct snd_timer_status __user *_status)
1802{
1803 struct snd_timer_user *tu;
1804 struct snd_timer_status status;
1805
1806 tu = file->private_data;
1807 if (!tu->timeri)
1808 return -EBADFD;
1809 memset(&status, 0, sizeof(status));
1810 status.tstamp = tu->tstamp;
1811 status.resolution = snd_timer_resolution(tu->timeri);
1812 status.lost = tu->timeri->lost;
1813 status.overrun = tu->overrun;
1814 spin_lock_irq(&tu->qlock);
1815 status.queue = tu->qused;
1816 spin_unlock_irq(&tu->qlock);
1817 if (copy_to_user(_status, &status, sizeof(status)))
1818 return -EFAULT;
1819 return 0;
1820}
1821
1822static int snd_timer_user_start(struct file *file)
1823{
1824 int err;
1825 struct snd_timer_user *tu;
1826
1827 tu = file->private_data;
1828 if (!tu->timeri)
1829 return -EBADFD;
1830 snd_timer_stop(tu->timeri);
1831 tu->timeri->lost = 0;
1832 tu->last_resolution = 0;
1833 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1834}
1835
1836static int snd_timer_user_stop(struct file *file)
1837{
1838 int err;
1839 struct snd_timer_user *tu;
1840
1841 tu = file->private_data;
1842 if (!tu->timeri)
1843 return -EBADFD;
1844 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1845}
1846
1847static int snd_timer_user_continue(struct file *file)
1848{
1849 int err;
1850 struct snd_timer_user *tu;
1851
1852 tu = file->private_data;
1853 if (!tu->timeri)
1854 return -EBADFD;
1855
1856 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1857 return snd_timer_user_start(file);
1858 tu->timeri->lost = 0;
1859 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1860}
1861
1862static int snd_timer_user_pause(struct file *file)
1863{
1864 int err;
1865 struct snd_timer_user *tu;
1866
1867 tu = file->private_data;
1868 if (!tu->timeri)
1869 return -EBADFD;
1870 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1871}
1872
1873enum {
1874 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1875 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1876 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1877 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1878};
1879
1880static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1881 unsigned long arg)
1882{
1883 struct snd_timer_user *tu;
1884 void __user *argp = (void __user *)arg;
1885 int __user *p = argp;
1886
1887 tu = file->private_data;
1888 switch (cmd) {
1889 case SNDRV_TIMER_IOCTL_PVERSION:
1890 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1891 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1892 return snd_timer_user_next_device(argp);
1893 case SNDRV_TIMER_IOCTL_TREAD:
1894 {
1895 int xarg, old_tread;
1896
1897 if (tu->timeri)
1898 return -EBUSY;
1899 if (get_user(xarg, p))
1900 return -EFAULT;
1901 old_tread = tu->tread;
1902 tu->tread = xarg ? 1 : 0;
1903 if (tu->tread != old_tread &&
1904 realloc_user_queue(tu, tu->queue_size) < 0) {
1905 tu->tread = old_tread;
1906 return -ENOMEM;
1907 }
1908 return 0;
1909 }
1910 case SNDRV_TIMER_IOCTL_GINFO:
1911 return snd_timer_user_ginfo(file, argp);
1912 case SNDRV_TIMER_IOCTL_GPARAMS:
1913 return snd_timer_user_gparams(file, argp);
1914 case SNDRV_TIMER_IOCTL_GSTATUS:
1915 return snd_timer_user_gstatus(file, argp);
1916 case SNDRV_TIMER_IOCTL_SELECT:
1917 return snd_timer_user_tselect(file, argp);
1918 case SNDRV_TIMER_IOCTL_INFO:
1919 return snd_timer_user_info(file, argp);
1920 case SNDRV_TIMER_IOCTL_PARAMS:
1921 return snd_timer_user_params(file, argp);
1922 case SNDRV_TIMER_IOCTL_STATUS:
1923 return snd_timer_user_status(file, argp);
1924 case SNDRV_TIMER_IOCTL_START:
1925 case SNDRV_TIMER_IOCTL_START_OLD:
1926 return snd_timer_user_start(file);
1927 case SNDRV_TIMER_IOCTL_STOP:
1928 case SNDRV_TIMER_IOCTL_STOP_OLD:
1929 return snd_timer_user_stop(file);
1930 case SNDRV_TIMER_IOCTL_CONTINUE:
1931 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1932 return snd_timer_user_continue(file);
1933 case SNDRV_TIMER_IOCTL_PAUSE:
1934 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1935 return snd_timer_user_pause(file);
1936 }
1937 return -ENOTTY;
1938}
1939
1940static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1941 unsigned long arg)
1942{
1943 struct snd_timer_user *tu = file->private_data;
1944 long ret;
1945
1946 mutex_lock(&tu->ioctl_lock);
1947 ret = __snd_timer_user_ioctl(file, cmd, arg);
1948 mutex_unlock(&tu->ioctl_lock);
1949 return ret;
1950}
1951
1952static int snd_timer_user_fasync(int fd, struct file * file, int on)
1953{
1954 struct snd_timer_user *tu;
1955
1956 tu = file->private_data;
1957 return fasync_helper(fd, file, on, &tu->fasync);
1958}
1959
1960static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1961 size_t count, loff_t *offset)
1962{
1963 struct snd_timer_user *tu;
1964 long result = 0, unit;
1965 int qhead;
1966 int err = 0;
1967
1968 tu = file->private_data;
1969 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1970 mutex_lock(&tu->ioctl_lock);
1971 spin_lock_irq(&tu->qlock);
1972 while ((long)count - result >= unit) {
1973 while (!tu->qused) {
1974 wait_queue_entry_t wait;
1975
1976 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1977 err = -EAGAIN;
1978 goto _error;
1979 }
1980
1981 set_current_state(TASK_INTERRUPTIBLE);
1982 init_waitqueue_entry(&wait, current);
1983 add_wait_queue(&tu->qchange_sleep, &wait);
1984
1985 spin_unlock_irq(&tu->qlock);
1986 mutex_unlock(&tu->ioctl_lock);
1987 schedule();
1988 mutex_lock(&tu->ioctl_lock);
1989 spin_lock_irq(&tu->qlock);
1990
1991 remove_wait_queue(&tu->qchange_sleep, &wait);
1992
1993 if (tu->disconnected) {
1994 err = -ENODEV;
1995 goto _error;
1996 }
1997 if (signal_pending(current)) {
1998 err = -ERESTARTSYS;
1999 goto _error;
2000 }
2001 }
2002
2003 qhead = tu->qhead++;
2004 tu->qhead %= tu->queue_size;
2005 tu->qused--;
2006 spin_unlock_irq(&tu->qlock);
2007
2008 if (tu->tread) {
2009 if (copy_to_user(buffer, &tu->tqueue[qhead],
2010 sizeof(struct snd_timer_tread)))
2011 err = -EFAULT;
2012 } else {
2013 if (copy_to_user(buffer, &tu->queue[qhead],
2014 sizeof(struct snd_timer_read)))
2015 err = -EFAULT;
2016 }
2017
2018 spin_lock_irq(&tu->qlock);
2019 if (err < 0)
2020 goto _error;
2021 result += unit;
2022 buffer += unit;
2023 }
2024 _error:
2025 spin_unlock_irq(&tu->qlock);
2026 mutex_unlock(&tu->ioctl_lock);
2027 return result > 0 ? result : err;
2028}
2029
2030static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
2031{
2032 unsigned int mask;
2033 struct snd_timer_user *tu;
2034
2035 tu = file->private_data;
2036
2037 poll_wait(file, &tu->qchange_sleep, wait);
2038
2039 mask = 0;
2040 spin_lock_irq(&tu->qlock);
2041 if (tu->qused)
2042 mask |= POLLIN | POLLRDNORM;
2043 if (tu->disconnected)
2044 mask |= POLLERR;
2045 spin_unlock_irq(&tu->qlock);
2046
2047 return mask;
2048}
2049
2050#ifdef CONFIG_COMPAT
2051#include "timer_compat.c"
2052#else
2053#define snd_timer_user_ioctl_compat NULL
2054#endif
2055
2056static const struct file_operations snd_timer_f_ops =
2057{
2058 .owner = THIS_MODULE,
2059 .read = snd_timer_user_read,
2060 .open = snd_timer_user_open,
2061 .release = snd_timer_user_release,
2062 .llseek = no_llseek,
2063 .poll = snd_timer_user_poll,
2064 .unlocked_ioctl = snd_timer_user_ioctl,
2065 .compat_ioctl = snd_timer_user_ioctl_compat,
2066 .fasync = snd_timer_user_fasync,
2067};
2068
2069
2070static void snd_timer_free_all(void)
2071{
2072 struct snd_timer *timer, *n;
2073
2074 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2075 snd_timer_free(timer);
2076}
2077
2078static struct device timer_dev;
2079
2080
2081
2082
2083
2084static int __init alsa_timer_init(void)
2085{
2086 int err;
2087
2088 snd_device_initialize(&timer_dev, NULL);
2089 dev_set_name(&timer_dev, "timer");
2090
2091#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2092 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2093 "system timer");
2094#endif
2095
2096 err = snd_timer_register_system();
2097 if (err < 0) {
2098 pr_err("ALSA: unable to register system timer (%i)\n", err);
2099 put_device(&timer_dev);
2100 return err;
2101 }
2102
2103 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2104 &snd_timer_f_ops, NULL, &timer_dev);
2105 if (err < 0) {
2106 pr_err("ALSA: unable to register timer device (%i)\n", err);
2107 snd_timer_free_all();
2108 put_device(&timer_dev);
2109 return err;
2110 }
2111
2112 snd_timer_proc_init();
2113 return 0;
2114}
2115
2116static void __exit alsa_timer_exit(void)
2117{
2118 snd_unregister_device(&timer_dev);
2119 snd_timer_free_all();
2120 put_device(&timer_dev);
2121 snd_timer_proc_done();
2122#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2123 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2124#endif
2125}
2126
2127module_init(alsa_timer_init)
2128module_exit(alsa_timer_exit)
2129
