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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 int 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 if (master->timer->num_instances >=
194 master->timer->max_instances)
195 return -EBUSY;
196 list_move_tail(&slave->open_list,
197 &master->slave_list_head);
198 master->timer->num_instances++;
199 spin_lock_irq(&slave_active_lock);
200 slave->master = master;
201 slave->timer = master->timer;
202 spin_unlock_irq(&slave_active_lock);
203 return 0;
204 }
205 }
206 }
207 return 0;
208}
209
210
211
212
213
214
215
216static int snd_timer_check_master(struct snd_timer_instance *master)
217{
218 struct snd_timer_instance *slave, *tmp;
219
220
221 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
222 if (slave->slave_class == master->slave_class &&
223 slave->slave_id == master->slave_id) {
224 if (master->timer->num_instances >=
225 master->timer->max_instances)
226 return -EBUSY;
227 list_move_tail(&slave->open_list, &master->slave_list_head);
228 master->timer->num_instances++;
229 spin_lock_irq(&slave_active_lock);
230 spin_lock(&master->timer->lock);
231 slave->master = master;
232 slave->timer = master->timer;
233 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
234 list_add_tail(&slave->active_list,
235 &master->slave_active_head);
236 spin_unlock(&master->timer->lock);
237 spin_unlock_irq(&slave_active_lock);
238 }
239 }
240 return 0;
241}
242
243static int snd_timer_close_locked(struct snd_timer_instance *timeri);
244
245
246
247
248
249int snd_timer_open(struct snd_timer_instance **ti,
250 char *owner, struct snd_timer_id *tid,
251 unsigned int slave_id)
252{
253 struct snd_timer *timer;
254 struct snd_timer_instance *timeri = NULL;
255 int err;
256
257 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
258
259 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
260 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
261 pr_debug("ALSA: timer: invalid slave class %i\n",
262 tid->dev_sclass);
263 return -EINVAL;
264 }
265 mutex_lock(®ister_mutex);
266 timeri = snd_timer_instance_new(owner, NULL);
267 if (!timeri) {
268 mutex_unlock(®ister_mutex);
269 return -ENOMEM;
270 }
271 timeri->slave_class = tid->dev_sclass;
272 timeri->slave_id = tid->device;
273 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
274 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
275 err = snd_timer_check_slave(timeri);
276 if (err < 0) {
277 snd_timer_close_locked(timeri);
278 timeri = NULL;
279 }
280 mutex_unlock(®ister_mutex);
281 *ti = timeri;
282 return err;
283 }
284
285
286 mutex_lock(®ister_mutex);
287 timer = snd_timer_find(tid);
288#ifdef CONFIG_MODULES
289 if (!timer) {
290 mutex_unlock(®ister_mutex);
291 snd_timer_request(tid);
292 mutex_lock(®ister_mutex);
293 timer = snd_timer_find(tid);
294 }
295#endif
296 if (!timer) {
297 mutex_unlock(®ister_mutex);
298 return -ENODEV;
299 }
300 if (!list_empty(&timer->open_list_head)) {
301 timeri = list_entry(timer->open_list_head.next,
302 struct snd_timer_instance, open_list);
303 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
304 mutex_unlock(®ister_mutex);
305 return -EBUSY;
306 }
307 }
308 if (timer->num_instances >= timer->max_instances) {
309 mutex_unlock(®ister_mutex);
310 return -EBUSY;
311 }
312 timeri = snd_timer_instance_new(owner, timer);
313 if (!timeri) {
314 mutex_unlock(®ister_mutex);
315 return -ENOMEM;
316 }
317
318 if (timer->card)
319 get_device(&timer->card->card_dev);
320 timeri->slave_class = tid->dev_sclass;
321 timeri->slave_id = slave_id;
322
323 if (list_empty(&timer->open_list_head) && timer->hw.open) {
324 int err = timer->hw.open(timer);
325 if (err) {
326 kfree(timeri->owner);
327 kfree(timeri);
328
329 if (timer->card)
330 put_device(&timer->card->card_dev);
331 module_put(timer->module);
332 mutex_unlock(®ister_mutex);
333 return err;
334 }
335 }
336
337 list_add_tail(&timeri->open_list, &timer->open_list_head);
338 timer->num_instances++;
339 err = snd_timer_check_master(timeri);
340 if (err < 0) {
341 snd_timer_close_locked(timeri);
342 timeri = NULL;
343 }
344 mutex_unlock(®ister_mutex);
345 *ti = timeri;
346 return err;
347}
348EXPORT_SYMBOL(snd_timer_open);
349
350
351
352
353
354static int snd_timer_close_locked(struct snd_timer_instance *timeri)
355{
356 struct snd_timer *timer = NULL;
357 struct snd_timer_instance *slave, *tmp;
358
359 list_del(&timeri->open_list);
360
361
362 snd_timer_stop(timeri);
363
364 timer = timeri->timer;
365 if (timer) {
366 timer->num_instances--;
367
368 spin_lock_irq(&timer->lock);
369 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
370 spin_unlock_irq(&timer->lock);
371 udelay(10);
372 spin_lock_irq(&timer->lock);
373 }
374 spin_unlock_irq(&timer->lock);
375
376
377 spin_lock_irq(&slave_active_lock);
378 spin_lock(&timer->lock);
379 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
380 open_list) {
381 list_move_tail(&slave->open_list, &snd_timer_slave_list);
382 timer->num_instances--;
383 slave->master = NULL;
384 slave->timer = NULL;
385 list_del_init(&slave->ack_list);
386 list_del_init(&slave->active_list);
387 }
388 spin_unlock(&timer->lock);
389 spin_unlock_irq(&slave_active_lock);
390
391
392 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
393 timer = NULL;
394 }
395
396 if (timeri->private_free)
397 timeri->private_free(timeri);
398 kfree(timeri->owner);
399 kfree(timeri);
400
401 if (timer) {
402 if (list_empty(&timer->open_list_head) && timer->hw.close)
403 timer->hw.close(timer);
404
405 if (timer->card)
406 put_device(&timer->card->card_dev);
407 module_put(timer->module);
408 }
409
410 return 0;
411}
412
413
414
415
416int snd_timer_close(struct snd_timer_instance *timeri)
417{
418 int err;
419
420 if (snd_BUG_ON(!timeri))
421 return -ENXIO;
422
423 mutex_lock(®ister_mutex);
424 err = snd_timer_close_locked(timeri);
425 mutex_unlock(®ister_mutex);
426 return err;
427}
428EXPORT_SYMBOL(snd_timer_close);
429
430unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
431{
432 struct snd_timer * timer;
433
434 if (timeri == NULL)
435 return 0;
436 timer = timeri->timer;
437 if (timer) {
438 if (timer->hw.c_resolution)
439 return timer->hw.c_resolution(timer);
440 return timer->hw.resolution;
441 }
442 return 0;
443}
444EXPORT_SYMBOL(snd_timer_resolution);
445
446static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
447{
448 struct snd_timer *timer;
449 unsigned long resolution = 0;
450 struct snd_timer_instance *ts;
451 struct timespec tstamp;
452
453 if (timer_tstamp_monotonic)
454 ktime_get_ts(&tstamp);
455 else
456 getnstimeofday(&tstamp);
457 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
458 event > SNDRV_TIMER_EVENT_PAUSE))
459 return;
460 if (event == SNDRV_TIMER_EVENT_START ||
461 event == SNDRV_TIMER_EVENT_CONTINUE)
462 resolution = snd_timer_resolution(ti);
463 if (ti->ccallback)
464 ti->ccallback(ti, event, &tstamp, resolution);
465 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
466 return;
467 timer = ti->timer;
468 if (timer == NULL)
469 return;
470 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
471 return;
472 list_for_each_entry(ts, &ti->slave_active_head, active_list)
473 if (ts->ccallback)
474 ts->ccallback(ts, event + 100, &tstamp, resolution);
475}
476
477
478static int snd_timer_start1(struct snd_timer_instance *timeri,
479 bool start, unsigned long ticks)
480{
481 struct snd_timer *timer;
482 int result;
483 unsigned long flags;
484
485 timer = timeri->timer;
486 if (!timer)
487 return -EINVAL;
488
489 spin_lock_irqsave(&timer->lock, flags);
490 if (timer->card && timer->card->shutdown) {
491 result = -ENODEV;
492 goto unlock;
493 }
494 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
495 SNDRV_TIMER_IFLG_START)) {
496 result = -EBUSY;
497 goto unlock;
498 }
499
500 if (start)
501 timeri->ticks = timeri->cticks = ticks;
502 else if (!timeri->cticks)
503 timeri->cticks = 1;
504 timeri->pticks = 0;
505
506 list_move_tail(&timeri->active_list, &timer->active_list_head);
507 if (timer->running) {
508 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
509 goto __start_now;
510 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
511 timeri->flags |= SNDRV_TIMER_IFLG_START;
512 result = 1;
513 } else {
514 if (start)
515 timer->sticks = ticks;
516 timer->hw.start(timer);
517 __start_now:
518 timer->running++;
519 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
520 result = 0;
521 }
522 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
523 SNDRV_TIMER_EVENT_CONTINUE);
524 unlock:
525 spin_unlock_irqrestore(&timer->lock, flags);
526 return result;
527}
528
529
530static int snd_timer_start_slave(struct snd_timer_instance *timeri,
531 bool start)
532{
533 unsigned long flags;
534
535 spin_lock_irqsave(&slave_active_lock, flags);
536 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
537 spin_unlock_irqrestore(&slave_active_lock, flags);
538 return -EBUSY;
539 }
540 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
541 if (timeri->master && timeri->timer) {
542 spin_lock(&timeri->timer->lock);
543 list_add_tail(&timeri->active_list,
544 &timeri->master->slave_active_head);
545 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
546 SNDRV_TIMER_EVENT_CONTINUE);
547 spin_unlock(&timeri->timer->lock);
548 }
549 spin_unlock_irqrestore(&slave_active_lock, flags);
550 return 1;
551}
552
553
554static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
555{
556 struct snd_timer *timer;
557 int result = 0;
558 unsigned long flags;
559
560 timer = timeri->timer;
561 if (!timer)
562 return -EINVAL;
563 spin_lock_irqsave(&timer->lock, flags);
564 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
565 SNDRV_TIMER_IFLG_START))) {
566 result = -EBUSY;
567 goto unlock;
568 }
569 list_del_init(&timeri->ack_list);
570 list_del_init(&timeri->active_list);
571 if (timer->card && timer->card->shutdown)
572 goto unlock;
573 if (stop) {
574 timeri->cticks = timeri->ticks;
575 timeri->pticks = 0;
576 }
577 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
578 !(--timer->running)) {
579 timer->hw.stop(timer);
580 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
581 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
582 snd_timer_reschedule(timer, 0);
583 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
584 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
585 timer->hw.start(timer);
586 }
587 }
588 }
589 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
590 if (stop)
591 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
592 else
593 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
594 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
595 SNDRV_TIMER_EVENT_CONTINUE);
596 unlock:
597 spin_unlock_irqrestore(&timer->lock, flags);
598 return result;
599}
600
601
602static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
603{
604 unsigned long flags;
605
606 spin_lock_irqsave(&slave_active_lock, flags);
607 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
608 spin_unlock_irqrestore(&slave_active_lock, flags);
609 return -EBUSY;
610 }
611 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
612 if (timeri->timer) {
613 spin_lock(&timeri->timer->lock);
614 list_del_init(&timeri->ack_list);
615 list_del_init(&timeri->active_list);
616 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
617 SNDRV_TIMER_EVENT_CONTINUE);
618 spin_unlock(&timeri->timer->lock);
619 }
620 spin_unlock_irqrestore(&slave_active_lock, flags);
621 return 0;
622}
623
624
625
626
627int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
628{
629 if (timeri == NULL || ticks < 1)
630 return -EINVAL;
631 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
632 return snd_timer_start_slave(timeri, true);
633 else
634 return snd_timer_start1(timeri, true, ticks);
635}
636EXPORT_SYMBOL(snd_timer_start);
637
638
639
640
641
642
643int snd_timer_stop(struct snd_timer_instance *timeri)
644{
645 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
646 return snd_timer_stop_slave(timeri, true);
647 else
648 return snd_timer_stop1(timeri, true);
649}
650EXPORT_SYMBOL(snd_timer_stop);
651
652
653
654
655int snd_timer_continue(struct snd_timer_instance *timeri)
656{
657
658 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
659 return -EINVAL;
660
661 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
662 return snd_timer_start_slave(timeri, false);
663 else
664 return snd_timer_start1(timeri, false, 0);
665}
666EXPORT_SYMBOL(snd_timer_continue);
667
668
669
670
671int snd_timer_pause(struct snd_timer_instance * timeri)
672{
673 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
674 return snd_timer_stop_slave(timeri, false);
675 else
676 return snd_timer_stop1(timeri, false);
677}
678EXPORT_SYMBOL(snd_timer_pause);
679
680
681
682
683
684
685
686static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
687{
688 struct snd_timer_instance *ti;
689 unsigned long ticks = ~0UL;
690
691 list_for_each_entry(ti, &timer->active_list_head, active_list) {
692 if (ti->flags & SNDRV_TIMER_IFLG_START) {
693 ti->flags &= ~SNDRV_TIMER_IFLG_START;
694 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
695 timer->running++;
696 }
697 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
698 if (ticks > ti->cticks)
699 ticks = ti->cticks;
700 }
701 }
702 if (ticks == ~0UL) {
703 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
704 return;
705 }
706 if (ticks > timer->hw.ticks)
707 ticks = timer->hw.ticks;
708 if (ticks_left != ticks)
709 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
710 timer->sticks = ticks;
711}
712
713
714
715
716
717static void snd_timer_tasklet(unsigned long arg)
718{
719 struct snd_timer *timer = (struct snd_timer *) arg;
720 struct snd_timer_instance *ti;
721 struct list_head *p;
722 unsigned long resolution, ticks;
723 unsigned long flags;
724
725 if (timer->card && timer->card->shutdown)
726 return;
727
728 spin_lock_irqsave(&timer->lock, flags);
729
730 while (!list_empty(&timer->sack_list_head)) {
731 p = timer->sack_list_head.next;
732 ti = list_entry(p, struct snd_timer_instance, ack_list);
733
734
735 list_del_init(p);
736
737 ticks = ti->pticks;
738 ti->pticks = 0;
739 resolution = ti->resolution;
740
741 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
742 spin_unlock(&timer->lock);
743 if (ti->callback)
744 ti->callback(ti, resolution, ticks);
745 spin_lock(&timer->lock);
746 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
747 }
748 spin_unlock_irqrestore(&timer->lock, flags);
749}
750
751
752
753
754
755
756
757void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
758{
759 struct snd_timer_instance *ti, *ts, *tmp;
760 unsigned long resolution, ticks;
761 struct list_head *p, *ack_list_head;
762 unsigned long flags;
763 int use_tasklet = 0;
764
765 if (timer == NULL)
766 return;
767
768 if (timer->card && timer->card->shutdown)
769 return;
770
771 spin_lock_irqsave(&timer->lock, flags);
772
773
774 if (timer->hw.c_resolution)
775 resolution = timer->hw.c_resolution(timer);
776 else
777 resolution = timer->hw.resolution;
778
779
780
781
782
783
784 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
785 active_list) {
786 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
787 continue;
788 ti->pticks += ticks_left;
789 ti->resolution = resolution;
790 if (ti->cticks < ticks_left)
791 ti->cticks = 0;
792 else
793 ti->cticks -= ticks_left;
794 if (ti->cticks)
795 continue;
796 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
797 ti->cticks = ti->ticks;
798 } else {
799 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
800 --timer->running;
801 list_del_init(&ti->active_list);
802 }
803 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
804 (ti->flags & SNDRV_TIMER_IFLG_FAST))
805 ack_list_head = &timer->ack_list_head;
806 else
807 ack_list_head = &timer->sack_list_head;
808 if (list_empty(&ti->ack_list))
809 list_add_tail(&ti->ack_list, ack_list_head);
810 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
811 ts->pticks = ti->pticks;
812 ts->resolution = resolution;
813 if (list_empty(&ts->ack_list))
814 list_add_tail(&ts->ack_list, ack_list_head);
815 }
816 }
817 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
818 snd_timer_reschedule(timer, timer->sticks);
819 if (timer->running) {
820 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
821 timer->hw.stop(timer);
822 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
823 }
824 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
825 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
826
827 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
828 timer->hw.start(timer);
829 }
830 } else {
831 timer->hw.stop(timer);
832 }
833
834
835 while (!list_empty(&timer->ack_list_head)) {
836 p = timer->ack_list_head.next;
837 ti = list_entry(p, struct snd_timer_instance, ack_list);
838
839
840 list_del_init(p);
841
842 ticks = ti->pticks;
843 ti->pticks = 0;
844
845 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
846 spin_unlock(&timer->lock);
847 if (ti->callback)
848 ti->callback(ti, resolution, ticks);
849 spin_lock(&timer->lock);
850 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
851 }
852
853
854 use_tasklet = !list_empty(&timer->sack_list_head);
855 spin_unlock_irqrestore(&timer->lock, flags);
856
857 if (use_tasklet)
858 tasklet_schedule(&timer->task_queue);
859}
860EXPORT_SYMBOL(snd_timer_interrupt);
861
862
863
864
865
866int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
867 struct snd_timer **rtimer)
868{
869 struct snd_timer *timer;
870 int err;
871 static struct snd_device_ops ops = {
872 .dev_free = snd_timer_dev_free,
873 .dev_register = snd_timer_dev_register,
874 .dev_disconnect = snd_timer_dev_disconnect,
875 };
876
877 if (snd_BUG_ON(!tid))
878 return -EINVAL;
879 if (rtimer)
880 *rtimer = NULL;
881 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
882 if (!timer)
883 return -ENOMEM;
884 timer->tmr_class = tid->dev_class;
885 timer->card = card;
886 timer->tmr_device = tid->device;
887 timer->tmr_subdevice = tid->subdevice;
888 if (id)
889 strlcpy(timer->id, id, sizeof(timer->id));
890 timer->sticks = 1;
891 INIT_LIST_HEAD(&timer->device_list);
892 INIT_LIST_HEAD(&timer->open_list_head);
893 INIT_LIST_HEAD(&timer->active_list_head);
894 INIT_LIST_HEAD(&timer->ack_list_head);
895 INIT_LIST_HEAD(&timer->sack_list_head);
896 spin_lock_init(&timer->lock);
897 tasklet_init(&timer->task_queue, snd_timer_tasklet,
898 (unsigned long)timer);
899 timer->max_instances = 1000;
900 if (card != NULL) {
901 timer->module = card->module;
902 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
903 if (err < 0) {
904 snd_timer_free(timer);
905 return err;
906 }
907 }
908 if (rtimer)
909 *rtimer = timer;
910 return 0;
911}
912EXPORT_SYMBOL(snd_timer_new);
913
914static int snd_timer_free(struct snd_timer *timer)
915{
916 if (!timer)
917 return 0;
918
919 mutex_lock(®ister_mutex);
920 if (! list_empty(&timer->open_list_head)) {
921 struct list_head *p, *n;
922 struct snd_timer_instance *ti;
923 pr_warn("ALSA: timer %p is busy?\n", timer);
924 list_for_each_safe(p, n, &timer->open_list_head) {
925 list_del_init(p);
926 ti = list_entry(p, struct snd_timer_instance, open_list);
927 ti->timer = NULL;
928 }
929 }
930 list_del(&timer->device_list);
931 mutex_unlock(®ister_mutex);
932
933 if (timer->private_free)
934 timer->private_free(timer);
935 kfree(timer);
936 return 0;
937}
938
939static int snd_timer_dev_free(struct snd_device *device)
940{
941 struct snd_timer *timer = device->device_data;
942 return snd_timer_free(timer);
943}
944
945static int snd_timer_dev_register(struct snd_device *dev)
946{
947 struct snd_timer *timer = dev->device_data;
948 struct snd_timer *timer1;
949
950 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
951 return -ENXIO;
952 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
953 !timer->hw.resolution && timer->hw.c_resolution == NULL)
954 return -EINVAL;
955
956 mutex_lock(®ister_mutex);
957 list_for_each_entry(timer1, &snd_timer_list, device_list) {
958 if (timer1->tmr_class > timer->tmr_class)
959 break;
960 if (timer1->tmr_class < timer->tmr_class)
961 continue;
962 if (timer1->card && timer->card) {
963 if (timer1->card->number > timer->card->number)
964 break;
965 if (timer1->card->number < timer->card->number)
966 continue;
967 }
968 if (timer1->tmr_device > timer->tmr_device)
969 break;
970 if (timer1->tmr_device < timer->tmr_device)
971 continue;
972 if (timer1->tmr_subdevice > timer->tmr_subdevice)
973 break;
974 if (timer1->tmr_subdevice < timer->tmr_subdevice)
975 continue;
976
977 mutex_unlock(®ister_mutex);
978 return -EBUSY;
979 }
980 list_add_tail(&timer->device_list, &timer1->device_list);
981 mutex_unlock(®ister_mutex);
982 return 0;
983}
984
985static int snd_timer_dev_disconnect(struct snd_device *device)
986{
987 struct snd_timer *timer = device->device_data;
988 struct snd_timer_instance *ti;
989
990 mutex_lock(®ister_mutex);
991 list_del_init(&timer->device_list);
992
993 list_for_each_entry(ti, &timer->open_list_head, open_list) {
994 if (ti->disconnect)
995 ti->disconnect(ti);
996 }
997 mutex_unlock(®ister_mutex);
998 return 0;
999}
1000
1001void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
1002{
1003 unsigned long flags;
1004 unsigned long resolution = 0;
1005 struct snd_timer_instance *ti, *ts;
1006
1007 if (timer->card && timer->card->shutdown)
1008 return;
1009 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
1010 return;
1011 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
1012 event > SNDRV_TIMER_EVENT_MRESUME))
1013 return;
1014 spin_lock_irqsave(&timer->lock, flags);
1015 if (event == SNDRV_TIMER_EVENT_MSTART ||
1016 event == SNDRV_TIMER_EVENT_MCONTINUE ||
1017 event == SNDRV_TIMER_EVENT_MRESUME) {
1018 if (timer->hw.c_resolution)
1019 resolution = timer->hw.c_resolution(timer);
1020 else
1021 resolution = timer->hw.resolution;
1022 }
1023 list_for_each_entry(ti, &timer->active_list_head, active_list) {
1024 if (ti->ccallback)
1025 ti->ccallback(ti, event, tstamp, resolution);
1026 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1027 if (ts->ccallback)
1028 ts->ccallback(ts, event, tstamp, resolution);
1029 }
1030 spin_unlock_irqrestore(&timer->lock, flags);
1031}
1032EXPORT_SYMBOL(snd_timer_notify);
1033
1034
1035
1036
1037int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1038{
1039 struct snd_timer_id tid;
1040
1041 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1042 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1043 tid.card = -1;
1044 tid.device = device;
1045 tid.subdevice = 0;
1046 return snd_timer_new(NULL, id, &tid, rtimer);
1047}
1048EXPORT_SYMBOL(snd_timer_global_new);
1049
1050int snd_timer_global_free(struct snd_timer *timer)
1051{
1052 return snd_timer_free(timer);
1053}
1054EXPORT_SYMBOL(snd_timer_global_free);
1055
1056int snd_timer_global_register(struct snd_timer *timer)
1057{
1058 struct snd_device dev;
1059
1060 memset(&dev, 0, sizeof(dev));
1061 dev.device_data = timer;
1062 return snd_timer_dev_register(&dev);
1063}
1064EXPORT_SYMBOL(snd_timer_global_register);
1065
1066
1067
1068
1069
1070struct snd_timer_system_private {
1071 struct timer_list tlist;
1072 unsigned long last_expires;
1073 unsigned long last_jiffies;
1074 unsigned long correction;
1075};
1076
1077static void snd_timer_s_function(unsigned long data)
1078{
1079 struct snd_timer *timer = (struct snd_timer *)data;
1080 struct snd_timer_system_private *priv = timer->private_data;
1081 unsigned long jiff = jiffies;
1082 if (time_after(jiff, priv->last_expires))
1083 priv->correction += (long)jiff - (long)priv->last_expires;
1084 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1085}
1086
1087static int snd_timer_s_start(struct snd_timer * timer)
1088{
1089 struct snd_timer_system_private *priv;
1090 unsigned long njiff;
1091
1092 priv = (struct snd_timer_system_private *) timer->private_data;
1093 njiff = (priv->last_jiffies = jiffies);
1094 if (priv->correction > timer->sticks - 1) {
1095 priv->correction -= timer->sticks - 1;
1096 njiff++;
1097 } else {
1098 njiff += timer->sticks - priv->correction;
1099 priv->correction = 0;
1100 }
1101 priv->last_expires = njiff;
1102 mod_timer(&priv->tlist, njiff);
1103 return 0;
1104}
1105
1106static int snd_timer_s_stop(struct snd_timer * timer)
1107{
1108 struct snd_timer_system_private *priv;
1109 unsigned long jiff;
1110
1111 priv = (struct snd_timer_system_private *) timer->private_data;
1112 del_timer(&priv->tlist);
1113 jiff = jiffies;
1114 if (time_before(jiff, priv->last_expires))
1115 timer->sticks = priv->last_expires - jiff;
1116 else
1117 timer->sticks = 1;
1118 priv->correction = 0;
1119 return 0;
1120}
1121
1122static int snd_timer_s_close(struct snd_timer *timer)
1123{
1124 struct snd_timer_system_private *priv;
1125
1126 priv = (struct snd_timer_system_private *)timer->private_data;
1127 del_timer_sync(&priv->tlist);
1128 return 0;
1129}
1130
1131static struct snd_timer_hardware snd_timer_system =
1132{
1133 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1134 .resolution = 1000000000L / HZ,
1135 .ticks = 10000000L,
1136 .close = snd_timer_s_close,
1137 .start = snd_timer_s_start,
1138 .stop = snd_timer_s_stop
1139};
1140
1141static void snd_timer_free_system(struct snd_timer *timer)
1142{
1143 kfree(timer->private_data);
1144}
1145
1146static int snd_timer_register_system(void)
1147{
1148 struct snd_timer *timer;
1149 struct snd_timer_system_private *priv;
1150 int err;
1151
1152 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1153 if (err < 0)
1154 return err;
1155 strcpy(timer->name, "system timer");
1156 timer->hw = snd_timer_system;
1157 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1158 if (priv == NULL) {
1159 snd_timer_free(timer);
1160 return -ENOMEM;
1161 }
1162 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1163 timer->private_data = priv;
1164 timer->private_free = snd_timer_free_system;
1165 return snd_timer_global_register(timer);
1166}
1167
1168#ifdef CONFIG_SND_PROC_FS
1169
1170
1171
1172
1173static void snd_timer_proc_read(struct snd_info_entry *entry,
1174 struct snd_info_buffer *buffer)
1175{
1176 struct snd_timer *timer;
1177 struct snd_timer_instance *ti;
1178
1179 mutex_lock(®ister_mutex);
1180 list_for_each_entry(timer, &snd_timer_list, device_list) {
1181 if (timer->card && timer->card->shutdown)
1182 continue;
1183 switch (timer->tmr_class) {
1184 case SNDRV_TIMER_CLASS_GLOBAL:
1185 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1186 break;
1187 case SNDRV_TIMER_CLASS_CARD:
1188 snd_iprintf(buffer, "C%i-%i: ",
1189 timer->card->number, timer->tmr_device);
1190 break;
1191 case SNDRV_TIMER_CLASS_PCM:
1192 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1193 timer->tmr_device, timer->tmr_subdevice);
1194 break;
1195 default:
1196 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1197 timer->card ? timer->card->number : -1,
1198 timer->tmr_device, timer->tmr_subdevice);
1199 }
1200 snd_iprintf(buffer, "%s :", timer->name);
1201 if (timer->hw.resolution)
1202 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1203 timer->hw.resolution / 1000,
1204 timer->hw.resolution % 1000,
1205 timer->hw.ticks);
1206 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1207 snd_iprintf(buffer, " SLAVE");
1208 snd_iprintf(buffer, "\n");
1209 list_for_each_entry(ti, &timer->open_list_head, open_list)
1210 snd_iprintf(buffer, " Client %s : %s\n",
1211 ti->owner ? ti->owner : "unknown",
1212 ti->flags & (SNDRV_TIMER_IFLG_START |
1213 SNDRV_TIMER_IFLG_RUNNING)
1214 ? "running" : "stopped");
1215 }
1216 mutex_unlock(®ister_mutex);
1217}
1218
1219static struct snd_info_entry *snd_timer_proc_entry;
1220
1221static void __init snd_timer_proc_init(void)
1222{
1223 struct snd_info_entry *entry;
1224
1225 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1226 if (entry != NULL) {
1227 entry->c.text.read = snd_timer_proc_read;
1228 if (snd_info_register(entry) < 0) {
1229 snd_info_free_entry(entry);
1230 entry = NULL;
1231 }
1232 }
1233 snd_timer_proc_entry = entry;
1234}
1235
1236static void __exit snd_timer_proc_done(void)
1237{
1238 snd_info_free_entry(snd_timer_proc_entry);
1239}
1240#else
1241#define snd_timer_proc_init()
1242#define snd_timer_proc_done()
1243#endif
1244
1245
1246
1247
1248
1249static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1250 unsigned long resolution,
1251 unsigned long ticks)
1252{
1253 struct snd_timer_user *tu = timeri->callback_data;
1254 struct snd_timer_read *r;
1255 int prev;
1256
1257 spin_lock(&tu->qlock);
1258 if (tu->qused > 0) {
1259 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1260 r = &tu->queue[prev];
1261 if (r->resolution == resolution) {
1262 r->ticks += ticks;
1263 goto __wake;
1264 }
1265 }
1266 if (tu->qused >= tu->queue_size) {
1267 tu->overrun++;
1268 } else {
1269 r = &tu->queue[tu->qtail++];
1270 tu->qtail %= tu->queue_size;
1271 r->resolution = resolution;
1272 r->ticks = ticks;
1273 tu->qused++;
1274 }
1275 __wake:
1276 spin_unlock(&tu->qlock);
1277 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1278 wake_up(&tu->qchange_sleep);
1279}
1280
1281static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1282 struct snd_timer_tread *tread)
1283{
1284 if (tu->qused >= tu->queue_size) {
1285 tu->overrun++;
1286 } else {
1287 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1288 tu->qtail %= tu->queue_size;
1289 tu->qused++;
1290 }
1291}
1292
1293static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1294 int event,
1295 struct timespec *tstamp,
1296 unsigned long resolution)
1297{
1298 struct snd_timer_user *tu = timeri->callback_data;
1299 struct snd_timer_tread r1;
1300 unsigned long flags;
1301
1302 if (event >= SNDRV_TIMER_EVENT_START &&
1303 event <= SNDRV_TIMER_EVENT_PAUSE)
1304 tu->tstamp = *tstamp;
1305 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1306 return;
1307 memset(&r1, 0, sizeof(r1));
1308 r1.event = event;
1309 r1.tstamp = *tstamp;
1310 r1.val = resolution;
1311 spin_lock_irqsave(&tu->qlock, flags);
1312 snd_timer_user_append_to_tqueue(tu, &r1);
1313 spin_unlock_irqrestore(&tu->qlock, flags);
1314 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1315 wake_up(&tu->qchange_sleep);
1316}
1317
1318static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1319{
1320 struct snd_timer_user *tu = timeri->callback_data;
1321
1322 tu->disconnected = true;
1323 wake_up(&tu->qchange_sleep);
1324}
1325
1326static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1327 unsigned long resolution,
1328 unsigned long ticks)
1329{
1330 struct snd_timer_user *tu = timeri->callback_data;
1331 struct snd_timer_tread *r, r1;
1332 struct timespec tstamp;
1333 int prev, append = 0;
1334
1335 memset(&r1, 0, sizeof(r1));
1336 memset(&tstamp, 0, sizeof(tstamp));
1337 spin_lock(&tu->qlock);
1338 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1339 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1340 spin_unlock(&tu->qlock);
1341 return;
1342 }
1343 if (tu->last_resolution != resolution || ticks > 0) {
1344 if (timer_tstamp_monotonic)
1345 ktime_get_ts(&tstamp);
1346 else
1347 getnstimeofday(&tstamp);
1348 }
1349 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1350 tu->last_resolution != resolution) {
1351 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1352 r1.tstamp = tstamp;
1353 r1.val = resolution;
1354 snd_timer_user_append_to_tqueue(tu, &r1);
1355 tu->last_resolution = resolution;
1356 append++;
1357 }
1358 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1359 goto __wake;
1360 if (ticks == 0)
1361 goto __wake;
1362 if (tu->qused > 0) {
1363 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1364 r = &tu->tqueue[prev];
1365 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1366 r->tstamp = tstamp;
1367 r->val += ticks;
1368 append++;
1369 goto __wake;
1370 }
1371 }
1372 r1.event = SNDRV_TIMER_EVENT_TICK;
1373 r1.tstamp = tstamp;
1374 r1.val = ticks;
1375 snd_timer_user_append_to_tqueue(tu, &r1);
1376 append++;
1377 __wake:
1378 spin_unlock(&tu->qlock);
1379 if (append == 0)
1380 return;
1381 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1382 wake_up(&tu->qchange_sleep);
1383}
1384
1385static int realloc_user_queue(struct snd_timer_user *tu, int size)
1386{
1387 struct snd_timer_read *queue = NULL;
1388 struct snd_timer_tread *tqueue = NULL;
1389
1390 if (tu->tread) {
1391 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1392 if (!tqueue)
1393 return -ENOMEM;
1394 } else {
1395 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1396 if (!queue)
1397 return -ENOMEM;
1398 }
1399
1400 spin_lock_irq(&tu->qlock);
1401 kfree(tu->queue);
1402 kfree(tu->tqueue);
1403 tu->queue_size = size;
1404 tu->queue = queue;
1405 tu->tqueue = tqueue;
1406 tu->qhead = tu->qtail = tu->qused = 0;
1407 spin_unlock_irq(&tu->qlock);
1408
1409 return 0;
1410}
1411
1412static int snd_timer_user_open(struct inode *inode, struct file *file)
1413{
1414 struct snd_timer_user *tu;
1415 int err;
1416
1417 err = nonseekable_open(inode, file);
1418 if (err < 0)
1419 return err;
1420
1421 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1422 if (tu == NULL)
1423 return -ENOMEM;
1424 spin_lock_init(&tu->qlock);
1425 init_waitqueue_head(&tu->qchange_sleep);
1426 mutex_init(&tu->ioctl_lock);
1427 tu->ticks = 1;
1428 if (realloc_user_queue(tu, 128) < 0) {
1429 kfree(tu);
1430 return -ENOMEM;
1431 }
1432 file->private_data = tu;
1433 return 0;
1434}
1435
1436static int snd_timer_user_release(struct inode *inode, struct file *file)
1437{
1438 struct snd_timer_user *tu;
1439
1440 if (file->private_data) {
1441 tu = file->private_data;
1442 file->private_data = NULL;
1443 mutex_lock(&tu->ioctl_lock);
1444 if (tu->timeri)
1445 snd_timer_close(tu->timeri);
1446 mutex_unlock(&tu->ioctl_lock);
1447 kfree(tu->queue);
1448 kfree(tu->tqueue);
1449 kfree(tu);
1450 }
1451 return 0;
1452}
1453
1454static void snd_timer_user_zero_id(struct snd_timer_id *id)
1455{
1456 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1457 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1458 id->card = -1;
1459 id->device = -1;
1460 id->subdevice = -1;
1461}
1462
1463static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1464{
1465 id->dev_class = timer->tmr_class;
1466 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1467 id->card = timer->card ? timer->card->number : -1;
1468 id->device = timer->tmr_device;
1469 id->subdevice = timer->tmr_subdevice;
1470}
1471
1472static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1473{
1474 struct snd_timer_id id;
1475 struct snd_timer *timer;
1476 struct list_head *p;
1477
1478 if (copy_from_user(&id, _tid, sizeof(id)))
1479 return -EFAULT;
1480 mutex_lock(®ister_mutex);
1481 if (id.dev_class < 0) {
1482 if (list_empty(&snd_timer_list))
1483 snd_timer_user_zero_id(&id);
1484 else {
1485 timer = list_entry(snd_timer_list.next,
1486 struct snd_timer, device_list);
1487 snd_timer_user_copy_id(&id, timer);
1488 }
1489 } else {
1490 switch (id.dev_class) {
1491 case SNDRV_TIMER_CLASS_GLOBAL:
1492 id.device = id.device < 0 ? 0 : id.device + 1;
1493 list_for_each(p, &snd_timer_list) {
1494 timer = list_entry(p, struct snd_timer, device_list);
1495 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1496 snd_timer_user_copy_id(&id, timer);
1497 break;
1498 }
1499 if (timer->tmr_device >= id.device) {
1500 snd_timer_user_copy_id(&id, timer);
1501 break;
1502 }
1503 }
1504 if (p == &snd_timer_list)
1505 snd_timer_user_zero_id(&id);
1506 break;
1507 case SNDRV_TIMER_CLASS_CARD:
1508 case SNDRV_TIMER_CLASS_PCM:
1509 if (id.card < 0) {
1510 id.card = 0;
1511 } else {
1512 if (id.device < 0) {
1513 id.device = 0;
1514 } else {
1515 if (id.subdevice < 0)
1516 id.subdevice = 0;
1517 else
1518 id.subdevice++;
1519 }
1520 }
1521 list_for_each(p, &snd_timer_list) {
1522 timer = list_entry(p, struct snd_timer, device_list);
1523 if (timer->tmr_class > id.dev_class) {
1524 snd_timer_user_copy_id(&id, timer);
1525 break;
1526 }
1527 if (timer->tmr_class < id.dev_class)
1528 continue;
1529 if (timer->card->number > id.card) {
1530 snd_timer_user_copy_id(&id, timer);
1531 break;
1532 }
1533 if (timer->card->number < id.card)
1534 continue;
1535 if (timer->tmr_device > id.device) {
1536 snd_timer_user_copy_id(&id, timer);
1537 break;
1538 }
1539 if (timer->tmr_device < id.device)
1540 continue;
1541 if (timer->tmr_subdevice > id.subdevice) {
1542 snd_timer_user_copy_id(&id, timer);
1543 break;
1544 }
1545 if (timer->tmr_subdevice < id.subdevice)
1546 continue;
1547 snd_timer_user_copy_id(&id, timer);
1548 break;
1549 }
1550 if (p == &snd_timer_list)
1551 snd_timer_user_zero_id(&id);
1552 break;
1553 default:
1554 snd_timer_user_zero_id(&id);
1555 }
1556 }
1557 mutex_unlock(®ister_mutex);
1558 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1559 return -EFAULT;
1560 return 0;
1561}
1562
1563static int snd_timer_user_ginfo(struct file *file,
1564 struct snd_timer_ginfo __user *_ginfo)
1565{
1566 struct snd_timer_ginfo *ginfo;
1567 struct snd_timer_id tid;
1568 struct snd_timer *t;
1569 struct list_head *p;
1570 int err = 0;
1571
1572 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1573 if (IS_ERR(ginfo))
1574 return PTR_ERR(ginfo);
1575
1576 tid = ginfo->tid;
1577 memset(ginfo, 0, sizeof(*ginfo));
1578 ginfo->tid = tid;
1579 mutex_lock(®ister_mutex);
1580 t = snd_timer_find(&tid);
1581 if (t != NULL) {
1582 ginfo->card = t->card ? t->card->number : -1;
1583 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1584 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1585 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1586 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1587 ginfo->resolution = t->hw.resolution;
1588 if (t->hw.resolution_min > 0) {
1589 ginfo->resolution_min = t->hw.resolution_min;
1590 ginfo->resolution_max = t->hw.resolution_max;
1591 }
1592 list_for_each(p, &t->open_list_head) {
1593 ginfo->clients++;
1594 }
1595 } else {
1596 err = -ENODEV;
1597 }
1598 mutex_unlock(®ister_mutex);
1599 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1600 err = -EFAULT;
1601 kfree(ginfo);
1602 return err;
1603}
1604
1605static int timer_set_gparams(struct snd_timer_gparams *gparams)
1606{
1607 struct snd_timer *t;
1608 int err;
1609
1610 mutex_lock(®ister_mutex);
1611 t = snd_timer_find(&gparams->tid);
1612 if (!t) {
1613 err = -ENODEV;
1614 goto _error;
1615 }
1616 if (!list_empty(&t->open_list_head)) {
1617 err = -EBUSY;
1618 goto _error;
1619 }
1620 if (!t->hw.set_period) {
1621 err = -ENOSYS;
1622 goto _error;
1623 }
1624 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1625_error:
1626 mutex_unlock(®ister_mutex);
1627 return err;
1628}
1629
1630static int snd_timer_user_gparams(struct file *file,
1631 struct snd_timer_gparams __user *_gparams)
1632{
1633 struct snd_timer_gparams gparams;
1634
1635 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1636 return -EFAULT;
1637 return timer_set_gparams(&gparams);
1638}
1639
1640static int snd_timer_user_gstatus(struct file *file,
1641 struct snd_timer_gstatus __user *_gstatus)
1642{
1643 struct snd_timer_gstatus gstatus;
1644 struct snd_timer_id tid;
1645 struct snd_timer *t;
1646 int err = 0;
1647
1648 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1649 return -EFAULT;
1650 tid = gstatus.tid;
1651 memset(&gstatus, 0, sizeof(gstatus));
1652 gstatus.tid = tid;
1653 mutex_lock(®ister_mutex);
1654 t = snd_timer_find(&tid);
1655 if (t != NULL) {
1656 if (t->hw.c_resolution)
1657 gstatus.resolution = t->hw.c_resolution(t);
1658 else
1659 gstatus.resolution = t->hw.resolution;
1660 if (t->hw.precise_resolution) {
1661 t->hw.precise_resolution(t, &gstatus.resolution_num,
1662 &gstatus.resolution_den);
1663 } else {
1664 gstatus.resolution_num = gstatus.resolution;
1665 gstatus.resolution_den = 1000000000uL;
1666 }
1667 } else {
1668 err = -ENODEV;
1669 }
1670 mutex_unlock(®ister_mutex);
1671 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1672 err = -EFAULT;
1673 return err;
1674}
1675
1676static int snd_timer_user_tselect(struct file *file,
1677 struct snd_timer_select __user *_tselect)
1678{
1679 struct snd_timer_user *tu;
1680 struct snd_timer_select tselect;
1681 char str[32];
1682 int err = 0;
1683
1684 tu = file->private_data;
1685 if (tu->timeri) {
1686 snd_timer_close(tu->timeri);
1687 tu->timeri = NULL;
1688 }
1689 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1690 err = -EFAULT;
1691 goto __err;
1692 }
1693 sprintf(str, "application %i", current->pid);
1694 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1695 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1696 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1697 if (err < 0)
1698 goto __err;
1699
1700 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1701 tu->timeri->callback = tu->tread
1702 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1703 tu->timeri->ccallback = snd_timer_user_ccallback;
1704 tu->timeri->callback_data = (void *)tu;
1705 tu->timeri->disconnect = snd_timer_user_disconnect;
1706
1707 __err:
1708 return err;
1709}
1710
1711static int snd_timer_user_info(struct file *file,
1712 struct snd_timer_info __user *_info)
1713{
1714 struct snd_timer_user *tu;
1715 struct snd_timer_info *info;
1716 struct snd_timer *t;
1717 int err = 0;
1718
1719 tu = file->private_data;
1720 if (!tu->timeri)
1721 return -EBADFD;
1722 t = tu->timeri->timer;
1723 if (!t)
1724 return -EBADFD;
1725
1726 info = kzalloc(sizeof(*info), GFP_KERNEL);
1727 if (! info)
1728 return -ENOMEM;
1729 info->card = t->card ? t->card->number : -1;
1730 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1731 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1732 strlcpy(info->id, t->id, sizeof(info->id));
1733 strlcpy(info->name, t->name, sizeof(info->name));
1734 info->resolution = t->hw.resolution;
1735 if (copy_to_user(_info, info, sizeof(*_info)))
1736 err = -EFAULT;
1737 kfree(info);
1738 return err;
1739}
1740
1741static int snd_timer_user_params(struct file *file,
1742 struct snd_timer_params __user *_params)
1743{
1744 struct snd_timer_user *tu;
1745 struct snd_timer_params params;
1746 struct snd_timer *t;
1747 int err;
1748
1749 tu = file->private_data;
1750 if (!tu->timeri)
1751 return -EBADFD;
1752 t = tu->timeri->timer;
1753 if (!t)
1754 return -EBADFD;
1755 if (copy_from_user(¶ms, _params, sizeof(params)))
1756 return -EFAULT;
1757 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1758 u64 resolution;
1759
1760 if (params.ticks < 1) {
1761 err = -EINVAL;
1762 goto _end;
1763 }
1764
1765
1766 resolution = snd_timer_resolution(tu->timeri);
1767 resolution *= params.ticks;
1768 if (resolution < 1000000) {
1769 err = -EINVAL;
1770 goto _end;
1771 }
1772 }
1773 if (params.queue_size > 0 &&
1774 (params.queue_size < 32 || params.queue_size > 1024)) {
1775 err = -EINVAL;
1776 goto _end;
1777 }
1778 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1779 (1<<SNDRV_TIMER_EVENT_TICK)|
1780 (1<<SNDRV_TIMER_EVENT_START)|
1781 (1<<SNDRV_TIMER_EVENT_STOP)|
1782 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1783 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1784 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1785 (1<<SNDRV_TIMER_EVENT_RESUME)|
1786 (1<<SNDRV_TIMER_EVENT_MSTART)|
1787 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1788 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1789 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1790 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1791 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1792 err = -EINVAL;
1793 goto _end;
1794 }
1795 snd_timer_stop(tu->timeri);
1796 spin_lock_irq(&t->lock);
1797 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1798 SNDRV_TIMER_IFLG_EXCLUSIVE|
1799 SNDRV_TIMER_IFLG_EARLY_EVENT);
1800 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1801 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1802 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1803 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1804 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1805 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1806 spin_unlock_irq(&t->lock);
1807 if (params.queue_size > 0 &&
1808 (unsigned int)tu->queue_size != params.queue_size) {
1809 err = realloc_user_queue(tu, params.queue_size);
1810 if (err < 0)
1811 goto _end;
1812 }
1813 spin_lock_irq(&tu->qlock);
1814 tu->qhead = tu->qtail = tu->qused = 0;
1815 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1816 if (tu->tread) {
1817 struct snd_timer_tread tread;
1818 memset(&tread, 0, sizeof(tread));
1819 tread.event = SNDRV_TIMER_EVENT_EARLY;
1820 tread.tstamp.tv_sec = 0;
1821 tread.tstamp.tv_nsec = 0;
1822 tread.val = 0;
1823 snd_timer_user_append_to_tqueue(tu, &tread);
1824 } else {
1825 struct snd_timer_read *r = &tu->queue[0];
1826 r->resolution = 0;
1827 r->ticks = 0;
1828 tu->qused++;
1829 tu->qtail++;
1830 }
1831 }
1832 tu->filter = params.filter;
1833 tu->ticks = params.ticks;
1834 spin_unlock_irq(&tu->qlock);
1835 err = 0;
1836 _end:
1837 if (copy_to_user(_params, ¶ms, sizeof(params)))
1838 return -EFAULT;
1839 return err;
1840}
1841
1842static int snd_timer_user_status(struct file *file,
1843 struct snd_timer_status __user *_status)
1844{
1845 struct snd_timer_user *tu;
1846 struct snd_timer_status status;
1847
1848 tu = file->private_data;
1849 if (!tu->timeri)
1850 return -EBADFD;
1851 memset(&status, 0, sizeof(status));
1852 status.tstamp = tu->tstamp;
1853 status.resolution = snd_timer_resolution(tu->timeri);
1854 status.lost = tu->timeri->lost;
1855 status.overrun = tu->overrun;
1856 spin_lock_irq(&tu->qlock);
1857 status.queue = tu->qused;
1858 spin_unlock_irq(&tu->qlock);
1859 if (copy_to_user(_status, &status, sizeof(status)))
1860 return -EFAULT;
1861 return 0;
1862}
1863
1864static int snd_timer_user_start(struct file *file)
1865{
1866 int err;
1867 struct snd_timer_user *tu;
1868
1869 tu = file->private_data;
1870 if (!tu->timeri)
1871 return -EBADFD;
1872 snd_timer_stop(tu->timeri);
1873 tu->timeri->lost = 0;
1874 tu->last_resolution = 0;
1875 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1876}
1877
1878static int snd_timer_user_stop(struct file *file)
1879{
1880 int err;
1881 struct snd_timer_user *tu;
1882
1883 tu = file->private_data;
1884 if (!tu->timeri)
1885 return -EBADFD;
1886 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1887}
1888
1889static int snd_timer_user_continue(struct file *file)
1890{
1891 int err;
1892 struct snd_timer_user *tu;
1893
1894 tu = file->private_data;
1895 if (!tu->timeri)
1896 return -EBADFD;
1897
1898 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1899 return snd_timer_user_start(file);
1900 tu->timeri->lost = 0;
1901 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1902}
1903
1904static int snd_timer_user_pause(struct file *file)
1905{
1906 int err;
1907 struct snd_timer_user *tu;
1908
1909 tu = file->private_data;
1910 if (!tu->timeri)
1911 return -EBADFD;
1912 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1913}
1914
1915enum {
1916 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1917 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1918 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1919 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1920};
1921
1922static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1923 unsigned long arg)
1924{
1925 struct snd_timer_user *tu;
1926 void __user *argp = (void __user *)arg;
1927 int __user *p = argp;
1928
1929 tu = file->private_data;
1930 switch (cmd) {
1931 case SNDRV_TIMER_IOCTL_PVERSION:
1932 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1933 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1934 return snd_timer_user_next_device(argp);
1935 case SNDRV_TIMER_IOCTL_TREAD:
1936 {
1937 int xarg, old_tread;
1938
1939 if (tu->timeri)
1940 return -EBUSY;
1941 if (get_user(xarg, p))
1942 return -EFAULT;
1943 old_tread = tu->tread;
1944 tu->tread = xarg ? 1 : 0;
1945 if (tu->tread != old_tread &&
1946 realloc_user_queue(tu, tu->queue_size) < 0) {
1947 tu->tread = old_tread;
1948 return -ENOMEM;
1949 }
1950 return 0;
1951 }
1952 case SNDRV_TIMER_IOCTL_GINFO:
1953 return snd_timer_user_ginfo(file, argp);
1954 case SNDRV_TIMER_IOCTL_GPARAMS:
1955 return snd_timer_user_gparams(file, argp);
1956 case SNDRV_TIMER_IOCTL_GSTATUS:
1957 return snd_timer_user_gstatus(file, argp);
1958 case SNDRV_TIMER_IOCTL_SELECT:
1959 return snd_timer_user_tselect(file, argp);
1960 case SNDRV_TIMER_IOCTL_INFO:
1961 return snd_timer_user_info(file, argp);
1962 case SNDRV_TIMER_IOCTL_PARAMS:
1963 return snd_timer_user_params(file, argp);
1964 case SNDRV_TIMER_IOCTL_STATUS:
1965 return snd_timer_user_status(file, argp);
1966 case SNDRV_TIMER_IOCTL_START:
1967 case SNDRV_TIMER_IOCTL_START_OLD:
1968 return snd_timer_user_start(file);
1969 case SNDRV_TIMER_IOCTL_STOP:
1970 case SNDRV_TIMER_IOCTL_STOP_OLD:
1971 return snd_timer_user_stop(file);
1972 case SNDRV_TIMER_IOCTL_CONTINUE:
1973 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1974 return snd_timer_user_continue(file);
1975 case SNDRV_TIMER_IOCTL_PAUSE:
1976 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1977 return snd_timer_user_pause(file);
1978 }
1979 return -ENOTTY;
1980}
1981
1982static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1983 unsigned long arg)
1984{
1985 struct snd_timer_user *tu = file->private_data;
1986 long ret;
1987
1988 mutex_lock(&tu->ioctl_lock);
1989 ret = __snd_timer_user_ioctl(file, cmd, arg);
1990 mutex_unlock(&tu->ioctl_lock);
1991 return ret;
1992}
1993
1994static int snd_timer_user_fasync(int fd, struct file * file, int on)
1995{
1996 struct snd_timer_user *tu;
1997
1998 tu = file->private_data;
1999 return fasync_helper(fd, file, on, &tu->fasync);
2000}
2001
2002static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
2003 size_t count, loff_t *offset)
2004{
2005 struct snd_timer_user *tu;
2006 long result = 0, unit;
2007 int qhead;
2008 int err = 0;
2009
2010 tu = file->private_data;
2011 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
2012 mutex_lock(&tu->ioctl_lock);
2013 spin_lock_irq(&tu->qlock);
2014 while ((long)count - result >= unit) {
2015 while (!tu->qused) {
2016 wait_queue_entry_t wait;
2017
2018 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
2019 err = -EAGAIN;
2020 goto _error;
2021 }
2022
2023 set_current_state(TASK_INTERRUPTIBLE);
2024 init_waitqueue_entry(&wait, current);
2025 add_wait_queue(&tu->qchange_sleep, &wait);
2026
2027 spin_unlock_irq(&tu->qlock);
2028 mutex_unlock(&tu->ioctl_lock);
2029 schedule();
2030 mutex_lock(&tu->ioctl_lock);
2031 spin_lock_irq(&tu->qlock);
2032
2033 remove_wait_queue(&tu->qchange_sleep, &wait);
2034
2035 if (tu->disconnected) {
2036 err = -ENODEV;
2037 goto _error;
2038 }
2039 if (signal_pending(current)) {
2040 err = -ERESTARTSYS;
2041 goto _error;
2042 }
2043 }
2044
2045 qhead = tu->qhead++;
2046 tu->qhead %= tu->queue_size;
2047 tu->qused--;
2048 spin_unlock_irq(&tu->qlock);
2049
2050 if (tu->tread) {
2051 if (copy_to_user(buffer, &tu->tqueue[qhead],
2052 sizeof(struct snd_timer_tread)))
2053 err = -EFAULT;
2054 } else {
2055 if (copy_to_user(buffer, &tu->queue[qhead],
2056 sizeof(struct snd_timer_read)))
2057 err = -EFAULT;
2058 }
2059
2060 spin_lock_irq(&tu->qlock);
2061 if (err < 0)
2062 goto _error;
2063 result += unit;
2064 buffer += unit;
2065 }
2066 _error:
2067 spin_unlock_irq(&tu->qlock);
2068 mutex_unlock(&tu->ioctl_lock);
2069 return result > 0 ? result : err;
2070}
2071
2072static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
2073{
2074 unsigned int mask;
2075 struct snd_timer_user *tu;
2076
2077 tu = file->private_data;
2078
2079 poll_wait(file, &tu->qchange_sleep, wait);
2080
2081 mask = 0;
2082 spin_lock_irq(&tu->qlock);
2083 if (tu->qused)
2084 mask |= POLLIN | POLLRDNORM;
2085 if (tu->disconnected)
2086 mask |= POLLERR;
2087 spin_unlock_irq(&tu->qlock);
2088
2089 return mask;
2090}
2091
2092#ifdef CONFIG_COMPAT
2093#include "timer_compat.c"
2094#else
2095#define snd_timer_user_ioctl_compat NULL
2096#endif
2097
2098static const struct file_operations snd_timer_f_ops =
2099{
2100 .owner = THIS_MODULE,
2101 .read = snd_timer_user_read,
2102 .open = snd_timer_user_open,
2103 .release = snd_timer_user_release,
2104 .llseek = no_llseek,
2105 .poll = snd_timer_user_poll,
2106 .unlocked_ioctl = snd_timer_user_ioctl,
2107 .compat_ioctl = snd_timer_user_ioctl_compat,
2108 .fasync = snd_timer_user_fasync,
2109};
2110
2111
2112static void snd_timer_free_all(void)
2113{
2114 struct snd_timer *timer, *n;
2115
2116 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2117 snd_timer_free(timer);
2118}
2119
2120static struct device timer_dev;
2121
2122
2123
2124
2125
2126static int __init alsa_timer_init(void)
2127{
2128 int err;
2129
2130 snd_device_initialize(&timer_dev, NULL);
2131 dev_set_name(&timer_dev, "timer");
2132
2133#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2134 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2135 "system timer");
2136#endif
2137
2138 err = snd_timer_register_system();
2139 if (err < 0) {
2140 pr_err("ALSA: unable to register system timer (%i)\n", err);
2141 goto put_timer;
2142 }
2143
2144 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2145 &snd_timer_f_ops, NULL, &timer_dev);
2146 if (err < 0) {
2147 pr_err("ALSA: unable to register timer device (%i)\n", err);
2148 snd_timer_free_all();
2149 goto put_timer;
2150 }
2151
2152 snd_timer_proc_init();
2153 return 0;
2154
2155put_timer:
2156 put_device(&timer_dev);
2157 return err;
2158}
2159
2160static void __exit alsa_timer_exit(void)
2161{
2162 snd_unregister_device(&timer_dev);
2163 snd_timer_free_all();
2164 put_device(&timer_dev);
2165 snd_timer_proc_done();
2166#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2167 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2168#endif
2169}
2170
2171module_init(alsa_timer_init)
2172module_exit(alsa_timer_exit)
2173
