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Merge remote-tracking branch 'ocfs2/linux-next'
[linux-2.6/next.git] / sound / core / timer.c
blob67ebf1c21c043a61dc0b51012f00778612af7b45
1 /*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <linux/moduleparam.h>
28 #include <linux/string.h>
29 #include <sound/core.h>
30 #include <sound/timer.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33 #include <sound/minors.h>
34 #include <sound/initval.h>
35 #include <linux/kmod.h>
36
37 #if defined(CONFIG_SND_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE)
38 #define DEFAULT_TIMER_LIMIT 4
39 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
40 #define DEFAULT_TIMER_LIMIT 2
41 #else
42 #define DEFAULT_TIMER_LIMIT 1
43 #endif
44
45 static int timer_limit = DEFAULT_TIMER_LIMIT;
46 static int timer_tstamp_monotonic = 1;
47 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
48 MODULE_DESCRIPTION("ALSA timer interface");
49 MODULE_LICENSE("GPL");
50 module_param(timer_limit, int, 0444);
51 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
52 module_param(timer_tstamp_monotonic, int, 0444);
53 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
54
55 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
56 MODULE_ALIAS("devname:snd/timer");
57
58 struct snd_timer_user {
59 struct snd_timer_instance *timeri;
60 int tread; /* enhanced read with timestamps and events */
61 unsigned long ticks;
62 unsigned long overrun;
63 int qhead;
64 int qtail;
65 int qused;
66 int queue_size;
67 struct snd_timer_read *queue;
68 struct snd_timer_tread *tqueue;
69 spinlock_t qlock;
70 unsigned long last_resolution;
71 unsigned int filter;
72 struct timespec tstamp; /* trigger tstamp */
73 wait_queue_head_t qchange_sleep;
74 struct fasync_struct *fasync;
75 struct mutex tread_sem;
76 };
77
78 /* list of timers */
79 static LIST_HEAD(snd_timer_list);
80
81 /* list of slave instances */
82 static LIST_HEAD(snd_timer_slave_list);
83
84 /* lock for slave active lists */
85 static DEFINE_SPINLOCK(slave_active_lock);
86
87 static DEFINE_MUTEX(register_mutex);
88
89 static int snd_timer_free(struct snd_timer *timer);
90 static int snd_timer_dev_free(struct snd_device *device);
91 static int snd_timer_dev_register(struct snd_device *device);
92 static int snd_timer_dev_disconnect(struct snd_device *device);
93
94 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
95
96 /*
97 * create a timer instance with the given owner string.
98 * when timer is not NULL, increments the module counter
99 */
100 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
101 struct snd_timer *timer)
102 {
103 struct snd_timer_instance *timeri;
104 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
105 if (timeri == NULL)
106 return NULL;
107 timeri->owner = kstrdup(owner, GFP_KERNEL);
108 if (! timeri->owner) {
109 kfree(timeri);
110 return NULL;
111 }
112 INIT_LIST_HEAD(&timeri->open_list);
113 INIT_LIST_HEAD(&timeri->active_list);
114 INIT_LIST_HEAD(&timeri->ack_list);
115 INIT_LIST_HEAD(&timeri->slave_list_head);
116 INIT_LIST_HEAD(&timeri->slave_active_head);
117
118 timeri->timer = timer;
119 if (timer && !try_module_get(timer->module)) {
120 kfree(timeri->owner);
121 kfree(timeri);
122 return NULL;
123 }
124
125 return timeri;
126 }
127
128 /*
129 * find a timer instance from the given timer id
130 */
131 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
132 {
133 struct snd_timer *timer = NULL;
134
135 list_for_each_entry(timer, &snd_timer_list, device_list) {
136 if (timer->tmr_class != tid->dev_class)
137 continue;
138 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
139 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
140 (timer->card == NULL ||
141 timer->card->number != tid->card))
142 continue;
143 if (timer->tmr_device != tid->device)
144 continue;
145 if (timer->tmr_subdevice != tid->subdevice)
146 continue;
147 return timer;
148 }
149 return NULL;
150 }
151
152 #ifdef CONFIG_MODULES
153
154 static void snd_timer_request(struct snd_timer_id *tid)
155 {
156 switch (tid->dev_class) {
157 case SNDRV_TIMER_CLASS_GLOBAL:
158 if (tid->device < timer_limit)
159 request_module("snd-timer-%i", tid->device);
160 break;
161 case SNDRV_TIMER_CLASS_CARD:
162 case SNDRV_TIMER_CLASS_PCM:
163 if (tid->card < snd_ecards_limit)
164 request_module("snd-card-%i", tid->card);
165 break;
166 default:
167 break;
168 }
169 }
170
171 #endif
172
173 /*
174 * look for a master instance matching with the slave id of the given slave.
175 * when found, relink the open_link of the slave.
176 *
177 * call this with register_mutex down.
178 */
179 static void snd_timer_check_slave(struct snd_timer_instance *slave)
180 {
181 struct snd_timer *timer;
182 struct snd_timer_instance *master;
183
184 /* FIXME: it's really dumb to look up all entries.. */
185 list_for_each_entry(timer, &snd_timer_list, device_list) {
186 list_for_each_entry(master, &timer->open_list_head, open_list) {
187 if (slave->slave_class == master->slave_class &&
188 slave->slave_id == master->slave_id) {
189 list_move_tail(&slave->open_list,
190 &master->slave_list_head);
191 spin_lock_irq(&slave_active_lock);
192 slave->master = master;
193 slave->timer = master->timer;
194 spin_unlock_irq(&slave_active_lock);
195 return;
196 }
197 }
198 }
199 }
200
201 /*
202 * look for slave instances matching with the slave id of the given master.
203 * when found, relink the open_link of slaves.
204 *
205 * call this with register_mutex down.
206 */
207 static void snd_timer_check_master(struct snd_timer_instance *master)
208 {
209 struct snd_timer_instance *slave, *tmp;
210
211 /* check all pending slaves */
212 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
213 if (slave->slave_class == master->slave_class &&
214 slave->slave_id == master->slave_id) {
215 list_move_tail(&slave->open_list, &master->slave_list_head);
216 spin_lock_irq(&slave_active_lock);
217 slave->master = master;
218 slave->timer = master->timer;
219 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
220 list_add_tail(&slave->active_list,
221 &master->slave_active_head);
222 spin_unlock_irq(&slave_active_lock);
223 }
224 }
225 }
226
227 /*
228 * open a timer instance
229 * when opening a master, the slave id must be here given.
230 */
231 int snd_timer_open(struct snd_timer_instance **ti,
232 char *owner, struct snd_timer_id *tid,
233 unsigned int slave_id)
234 {
235 struct snd_timer *timer;
236 struct snd_timer_instance *timeri = NULL;
237
238 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
239 /* open a slave instance */
240 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
241 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
242 snd_printd("invalid slave class %i\n", tid->dev_sclass);
243 return -EINVAL;
244 }
245 mutex_lock(&register_mutex);
246 timeri = snd_timer_instance_new(owner, NULL);
247 if (!timeri) {
248 mutex_unlock(&register_mutex);
249 return -ENOMEM;
250 }
251 timeri->slave_class = tid->dev_sclass;
252 timeri->slave_id = tid->device;
253 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
254 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
255 snd_timer_check_slave(timeri);
256 mutex_unlock(&register_mutex);
257 *ti = timeri;
258 return 0;
259 }
260
261 /* open a master instance */
262 mutex_lock(&register_mutex);
263 timer = snd_timer_find(tid);
264 #ifdef CONFIG_MODULES
265 if (!timer) {
266 mutex_unlock(&register_mutex);
267 snd_timer_request(tid);
268 mutex_lock(&register_mutex);
269 timer = snd_timer_find(tid);
270 }
271 #endif
272 if (!timer) {
273 mutex_unlock(&register_mutex);
274 return -ENODEV;
275 }
276 if (!list_empty(&timer->open_list_head)) {
277 timeri = list_entry(timer->open_list_head.next,
278 struct snd_timer_instance, open_list);
279 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
280 mutex_unlock(&register_mutex);
281 return -EBUSY;
282 }
283 }
284 timeri = snd_timer_instance_new(owner, timer);
285 if (!timeri) {
286 mutex_unlock(&register_mutex);
287 return -ENOMEM;
288 }
289 timeri->slave_class = tid->dev_sclass;
290 timeri->slave_id = slave_id;
291 if (list_empty(&timer->open_list_head) && timer->hw.open)
292 timer->hw.open(timer);
293 list_add_tail(&timeri->open_list, &timer->open_list_head);
294 snd_timer_check_master(timeri);
295 mutex_unlock(&register_mutex);
296 *ti = timeri;
297 return 0;
298 }
299
300 static int _snd_timer_stop(struct snd_timer_instance *timeri,
301 int keep_flag, int event);
302
303 /*
304 * close a timer instance
305 */
306 int snd_timer_close(struct snd_timer_instance *timeri)
307 {
308 struct snd_timer *timer = NULL;
309 struct snd_timer_instance *slave, *tmp;
310
311 if (snd_BUG_ON(!timeri))
312 return -ENXIO;
313
314 /* force to stop the timer */
315 snd_timer_stop(timeri);
316
317 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
318 /* wait, until the active callback is finished */
319 spin_lock_irq(&slave_active_lock);
320 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
321 spin_unlock_irq(&slave_active_lock);
322 udelay(10);
323 spin_lock_irq(&slave_active_lock);
324 }
325 spin_unlock_irq(&slave_active_lock);
326 mutex_lock(&register_mutex);
327 list_del(&timeri->open_list);
328 mutex_unlock(&register_mutex);
329 } else {
330 timer = timeri->timer;
331 if (snd_BUG_ON(!timer))
332 goto out;
333 /* wait, until the active callback is finished */
334 spin_lock_irq(&timer->lock);
335 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
336 spin_unlock_irq(&timer->lock);
337 udelay(10);
338 spin_lock_irq(&timer->lock);
339 }
340 spin_unlock_irq(&timer->lock);
341 mutex_lock(&register_mutex);
342 list_del(&timeri->open_list);
343 if (timer && list_empty(&timer->open_list_head) &&
344 timer->hw.close)
345 timer->hw.close(timer);
346 /* remove slave links */
347 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
348 open_list) {
349 spin_lock_irq(&slave_active_lock);
350 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
351 list_move_tail(&slave->open_list, &snd_timer_slave_list);
352 slave->master = NULL;
353 slave->timer = NULL;
354 spin_unlock_irq(&slave_active_lock);
355 }
356 mutex_unlock(&register_mutex);
357 }
358 out:
359 if (timeri->private_free)
360 timeri->private_free(timeri);
361 kfree(timeri->owner);
362 kfree(timeri);
363 if (timer)
364 module_put(timer->module);
365 return 0;
366 }
367
368 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
369 {
370 struct snd_timer * timer;
371
372 if (timeri == NULL)
373 return 0;
374 if ((timer = timeri->timer) != NULL) {
375 if (timer->hw.c_resolution)
376 return timer->hw.c_resolution(timer);
377 return timer->hw.resolution;
378 }
379 return 0;
380 }
381
382 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
383 {
384 struct snd_timer *timer;
385 unsigned long flags;
386 unsigned long resolution = 0;
387 struct snd_timer_instance *ts;
388 struct timespec tstamp;
389
390 if (timer_tstamp_monotonic)
391 do_posix_clock_monotonic_gettime(&tstamp);
392 else
393 getnstimeofday(&tstamp);
394 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
395 event > SNDRV_TIMER_EVENT_PAUSE))
396 return;
397 if (event == SNDRV_TIMER_EVENT_START ||
398 event == SNDRV_TIMER_EVENT_CONTINUE)
399 resolution = snd_timer_resolution(ti);
400 if (ti->ccallback)
401 ti->ccallback(ti, event, &tstamp, resolution);
402 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
403 return;
404 timer = ti->timer;
405 if (timer == NULL)
406 return;
407 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
408 return;
409 spin_lock_irqsave(&timer->lock, flags);
410 list_for_each_entry(ts, &ti->slave_active_head, active_list)
411 if (ts->ccallback)
412 ts->ccallback(ti, event + 100, &tstamp, resolution);
413 spin_unlock_irqrestore(&timer->lock, flags);
414 }
415
416 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
417 unsigned long sticks)
418 {
419 list_move_tail(&timeri->active_list, &timer->active_list_head);
420 if (timer->running) {
421 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
422 goto __start_now;
423 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
424 timeri->flags |= SNDRV_TIMER_IFLG_START;
425 return 1; /* delayed start */
426 } else {
427 timer->sticks = sticks;
428 timer->hw.start(timer);
429 __start_now:
430 timer->running++;
431 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
432 return 0;
433 }
434 }
435
436 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
437 {
438 unsigned long flags;
439
440 spin_lock_irqsave(&slave_active_lock, flags);
441 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
442 if (timeri->master)
443 list_add_tail(&timeri->active_list,
444 &timeri->master->slave_active_head);
445 spin_unlock_irqrestore(&slave_active_lock, flags);
446 return 1; /* delayed start */
447 }
448
449 /*
450 * start the timer instance
451 */
452 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
453 {
454 struct snd_timer *timer;
455 int result = -EINVAL;
456 unsigned long flags;
457
458 if (timeri == NULL || ticks < 1)
459 return -EINVAL;
460 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
461 result = snd_timer_start_slave(timeri);
462 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
463 return result;
464 }
465 timer = timeri->timer;
466 if (timer == NULL)
467 return -EINVAL;
468 spin_lock_irqsave(&timer->lock, flags);
469 timeri->ticks = timeri->cticks = ticks;
470 timeri->pticks = 0;
471 result = snd_timer_start1(timer, timeri, ticks);
472 spin_unlock_irqrestore(&timer->lock, flags);
473 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
474 return result;
475 }
476
477 static int _snd_timer_stop(struct snd_timer_instance * timeri,
478 int keep_flag, int event)
479 {
480 struct snd_timer *timer;
481 unsigned long flags;
482
483 if (snd_BUG_ON(!timeri))
484 return -ENXIO;
485
486 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
487 if (!keep_flag) {
488 spin_lock_irqsave(&slave_active_lock, flags);
489 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
490 spin_unlock_irqrestore(&slave_active_lock, flags);
491 }
492 goto __end;
493 }
494 timer = timeri->timer;
495 if (!timer)
496 return -EINVAL;
497 spin_lock_irqsave(&timer->lock, flags);
498 list_del_init(&timeri->ack_list);
499 list_del_init(&timeri->active_list);
500 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
501 !(--timer->running)) {
502 timer->hw.stop(timer);
503 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
504 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
505 snd_timer_reschedule(timer, 0);
506 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
507 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
508 timer->hw.start(timer);
509 }
510 }
511 }
512 if (!keep_flag)
513 timeri->flags &=
514 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
515 spin_unlock_irqrestore(&timer->lock, flags);
516 __end:
517 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
518 snd_timer_notify1(timeri, event);
519 return 0;
520 }
521
522 /*
523 * stop the timer instance.
524 *
525 * do not call this from the timer callback!
526 */
527 int snd_timer_stop(struct snd_timer_instance *timeri)
528 {
529 struct snd_timer *timer;
530 unsigned long flags;
531 int err;
532
533 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
534 if (err < 0)
535 return err;
536 timer = timeri->timer;
537 if (!timer)
538 return -EINVAL;
539 spin_lock_irqsave(&timer->lock, flags);
540 timeri->cticks = timeri->ticks;
541 timeri->pticks = 0;
542 spin_unlock_irqrestore(&timer->lock, flags);
543 return 0;
544 }
545
546 /*
547 * start again.. the tick is kept.
548 */
549 int snd_timer_continue(struct snd_timer_instance *timeri)
550 {
551 struct snd_timer *timer;
552 int result = -EINVAL;
553 unsigned long flags;
554
555 if (timeri == NULL)
556 return result;
557 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
558 return snd_timer_start_slave(timeri);
559 timer = timeri->timer;
560 if (! timer)
561 return -EINVAL;
562 spin_lock_irqsave(&timer->lock, flags);
563 if (!timeri->cticks)
564 timeri->cticks = 1;
565 timeri->pticks = 0;
566 result = snd_timer_start1(timer, timeri, timer->sticks);
567 spin_unlock_irqrestore(&timer->lock, flags);
568 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
569 return result;
570 }
571
572 /*
573 * pause.. remember the ticks left
574 */
575 int snd_timer_pause(struct snd_timer_instance * timeri)
576 {
577 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
578 }
579
580 /*
581 * reschedule the timer
582 *
583 * start pending instances and check the scheduling ticks.
584 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
585 */
586 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
587 {
588 struct snd_timer_instance *ti;
589 unsigned long ticks = ~0UL;
590
591 list_for_each_entry(ti, &timer->active_list_head, active_list) {
592 if (ti->flags & SNDRV_TIMER_IFLG_START) {
593 ti->flags &= ~SNDRV_TIMER_IFLG_START;
594 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
595 timer->running++;
596 }
597 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
598 if (ticks > ti->cticks)
599 ticks = ti->cticks;
600 }
601 }
602 if (ticks == ~0UL) {
603 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
604 return;
605 }
606 if (ticks > timer->hw.ticks)
607 ticks = timer->hw.ticks;
608 if (ticks_left != ticks)
609 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
610 timer->sticks = ticks;
611 }
612
613 /*
614 * timer tasklet
615 *
616 */
617 static void snd_timer_tasklet(unsigned long arg)
618 {
619 struct snd_timer *timer = (struct snd_timer *) arg;
620 struct snd_timer_instance *ti;
621 struct list_head *p;
622 unsigned long resolution, ticks;
623 unsigned long flags;
624
625 spin_lock_irqsave(&timer->lock, flags);
626 /* now process all callbacks */
627 while (!list_empty(&timer->sack_list_head)) {
628 p = timer->sack_list_head.next; /* get first item */
629 ti = list_entry(p, struct snd_timer_instance, ack_list);
630
631 /* remove from ack_list and make empty */
632 list_del_init(p);
633
634 ticks = ti->pticks;
635 ti->pticks = 0;
636 resolution = ti->resolution;
637
638 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
639 spin_unlock(&timer->lock);
640 if (ti->callback)
641 ti->callback(ti, resolution, ticks);
642 spin_lock(&timer->lock);
643 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
644 }
645 spin_unlock_irqrestore(&timer->lock, flags);
646 }
647
648 /*
649 * timer interrupt
650 *
651 * ticks_left is usually equal to timer->sticks.
652 *
653 */
654 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
655 {
656 struct snd_timer_instance *ti, *ts, *tmp;
657 unsigned long resolution, ticks;
658 struct list_head *p, *ack_list_head;
659 unsigned long flags;
660 int use_tasklet = 0;
661
662 if (timer == NULL)
663 return;
664
665 spin_lock_irqsave(&timer->lock, flags);
666
667 /* remember the current resolution */
668 if (timer->hw.c_resolution)
669 resolution = timer->hw.c_resolution(timer);
670 else
671 resolution = timer->hw.resolution;
672
673 /* loop for all active instances
674 * Here we cannot use list_for_each_entry because the active_list of a
675 * processed instance is relinked to done_list_head before the callback
676 * is called.
677 */
678 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
679 active_list) {
680 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
681 continue;
682 ti->pticks += ticks_left;
683 ti->resolution = resolution;
684 if (ti->cticks < ticks_left)
685 ti->cticks = 0;
686 else
687 ti->cticks -= ticks_left;
688 if (ti->cticks) /* not expired */
689 continue;
690 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
691 ti->cticks = ti->ticks;
692 } else {
693 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
694 if (--timer->running)
695 list_del(&ti->active_list);
696 }
697 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
698 (ti->flags & SNDRV_TIMER_IFLG_FAST))
699 ack_list_head = &timer->ack_list_head;
700 else
701 ack_list_head = &timer->sack_list_head;
702 if (list_empty(&ti->ack_list))
703 list_add_tail(&ti->ack_list, ack_list_head);
704 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
705 ts->pticks = ti->pticks;
706 ts->resolution = resolution;
707 if (list_empty(&ts->ack_list))
708 list_add_tail(&ts->ack_list, ack_list_head);
709 }
710 }
711 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
712 snd_timer_reschedule(timer, timer->sticks);
713 if (timer->running) {
714 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
715 timer->hw.stop(timer);
716 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
717 }
718 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
719 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
720 /* restart timer */
721 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
722 timer->hw.start(timer);
723 }
724 } else {
725 timer->hw.stop(timer);
726 }
727
728 /* now process all fast callbacks */
729 while (!list_empty(&timer->ack_list_head)) {
730 p = timer->ack_list_head.next; /* get first item */
731 ti = list_entry(p, struct snd_timer_instance, ack_list);
732
733 /* remove from ack_list and make empty */
734 list_del_init(p);
735
736 ticks = ti->pticks;
737 ti->pticks = 0;
738
739 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
740 spin_unlock(&timer->lock);
741 if (ti->callback)
742 ti->callback(ti, resolution, ticks);
743 spin_lock(&timer->lock);
744 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
745 }
746
747 /* do we have any slow callbacks? */
748 use_tasklet = !list_empty(&timer->sack_list_head);
749 spin_unlock_irqrestore(&timer->lock, flags);
750
751 if (use_tasklet)
752 tasklet_schedule(&timer->task_queue);
753 }
754
755 /*
756
757 */
758
759 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
760 struct snd_timer **rtimer)
761 {
762 struct snd_timer *timer;
763 int err;
764 static struct snd_device_ops ops = {
765 .dev_free = snd_timer_dev_free,
766 .dev_register = snd_timer_dev_register,
767 .dev_disconnect = snd_timer_dev_disconnect,
768 };
769
770 if (snd_BUG_ON(!tid))
771 return -EINVAL;
772 if (rtimer)
773 *rtimer = NULL;
774 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
775 if (timer == NULL) {
776 snd_printk(KERN_ERR "timer: cannot allocate\n");
777 return -ENOMEM;
778 }
779 timer->tmr_class = tid->dev_class;
780 timer->card = card;
781 timer->tmr_device = tid->device;
782 timer->tmr_subdevice = tid->subdevice;
783 if (id)
784 strlcpy(timer->id, id, sizeof(timer->id));
785 INIT_LIST_HEAD(&timer->device_list);
786 INIT_LIST_HEAD(&timer->open_list_head);
787 INIT_LIST_HEAD(&timer->active_list_head);
788 INIT_LIST_HEAD(&timer->ack_list_head);
789 INIT_LIST_HEAD(&timer->sack_list_head);
790 spin_lock_init(&timer->lock);
791 tasklet_init(&timer->task_queue, snd_timer_tasklet,
792 (unsigned long)timer);
793 if (card != NULL) {
794 timer->module = card->module;
795 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
796 if (err < 0) {
797 snd_timer_free(timer);
798 return err;
799 }
800 }
801 if (rtimer)
802 *rtimer = timer;
803 return 0;
804 }
805
806 static int snd_timer_free(struct snd_timer *timer)
807 {
808 if (!timer)
809 return 0;
810
811 mutex_lock(&register_mutex);
812 if (! list_empty(&timer->open_list_head)) {
813 struct list_head *p, *n;
814 struct snd_timer_instance *ti;
815 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
816 list_for_each_safe(p, n, &timer->open_list_head) {
817 list_del_init(p);
818 ti = list_entry(p, struct snd_timer_instance, open_list);
819 ti->timer = NULL;
820 }
821 }
822 list_del(&timer->device_list);
823 mutex_unlock(&register_mutex);
824
825 if (timer->private_free)
826 timer->private_free(timer);
827 kfree(timer);
828 return 0;
829 }
830
831 static int snd_timer_dev_free(struct snd_device *device)
832 {
833 struct snd_timer *timer = device->device_data;
834 return snd_timer_free(timer);
835 }
836
837 static int snd_timer_dev_register(struct snd_device *dev)
838 {
839 struct snd_timer *timer = dev->device_data;
840 struct snd_timer *timer1;
841
842 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
843 return -ENXIO;
844 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
845 !timer->hw.resolution && timer->hw.c_resolution == NULL)
846 return -EINVAL;
847
848 mutex_lock(&register_mutex);
849 list_for_each_entry(timer1, &snd_timer_list, device_list) {
850 if (timer1->tmr_class > timer->tmr_class)
851 break;
852 if (timer1->tmr_class < timer->tmr_class)
853 continue;
854 if (timer1->card && timer->card) {
855 if (timer1->card->number > timer->card->number)
856 break;
857 if (timer1->card->number < timer->card->number)
858 continue;
859 }
860 if (timer1->tmr_device > timer->tmr_device)
861 break;
862 if (timer1->tmr_device < timer->tmr_device)
863 continue;
864 if (timer1->tmr_subdevice > timer->tmr_subdevice)
865 break;
866 if (timer1->tmr_subdevice < timer->tmr_subdevice)
867 continue;
868 /* conflicts.. */
869 mutex_unlock(&register_mutex);
870 return -EBUSY;
871 }
872 list_add_tail(&timer->device_list, &timer1->device_list);
873 mutex_unlock(&register_mutex);
874 return 0;
875 }
876
877 static int snd_timer_dev_disconnect(struct snd_device *device)
878 {
879 struct snd_timer *timer = device->device_data;
880 mutex_lock(&register_mutex);
881 list_del_init(&timer->device_list);
882 mutex_unlock(&register_mutex);
883 return 0;
884 }
885
886 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
887 {
888 unsigned long flags;
889 unsigned long resolution = 0;
890 struct snd_timer_instance *ti, *ts;
891
892 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
893 return;
894 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
895 event > SNDRV_TIMER_EVENT_MRESUME))
896 return;
897 spin_lock_irqsave(&timer->lock, flags);
898 if (event == SNDRV_TIMER_EVENT_MSTART ||
899 event == SNDRV_TIMER_EVENT_MCONTINUE ||
900 event == SNDRV_TIMER_EVENT_MRESUME) {
901 if (timer->hw.c_resolution)
902 resolution = timer->hw.c_resolution(timer);
903 else
904 resolution = timer->hw.resolution;
905 }
906 list_for_each_entry(ti, &timer->active_list_head, active_list) {
907 if (ti->ccallback)
908 ti->ccallback(ti, event, tstamp, resolution);
909 list_for_each_entry(ts, &ti->slave_active_head, active_list)
910 if (ts->ccallback)
911 ts->ccallback(ts, event, tstamp, resolution);
912 }
913 spin_unlock_irqrestore(&timer->lock, flags);
914 }
915
916 /*
917 * exported functions for global timers
918 */
919 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
920 {
921 struct snd_timer_id tid;
922
923 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
924 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
925 tid.card = -1;
926 tid.device = device;
927 tid.subdevice = 0;
928 return snd_timer_new(NULL, id, &tid, rtimer);
929 }
930
931 int snd_timer_global_free(struct snd_timer *timer)
932 {
933 return snd_timer_free(timer);
934 }
935
936 int snd_timer_global_register(struct snd_timer *timer)
937 {
938 struct snd_device dev;
939
940 memset(&dev, 0, sizeof(dev));
941 dev.device_data = timer;
942 return snd_timer_dev_register(&dev);
943 }
944
945 /*
946 * System timer
947 */
948
949 struct snd_timer_system_private {
950 struct timer_list tlist;
951 unsigned long last_expires;
952 unsigned long last_jiffies;
953 unsigned long correction;
954 };
955
956 static void snd_timer_s_function(unsigned long data)
957 {
958 struct snd_timer *timer = (struct snd_timer *)data;
959 struct snd_timer_system_private *priv = timer->private_data;
960 unsigned long jiff = jiffies;
961 if (time_after(jiff, priv->last_expires))
962 priv->correction += (long)jiff - (long)priv->last_expires;
963 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
964 }
965
966 static int snd_timer_s_start(struct snd_timer * timer)
967 {
968 struct snd_timer_system_private *priv;
969 unsigned long njiff;
970
971 priv = (struct snd_timer_system_private *) timer->private_data;
972 njiff = (priv->last_jiffies = jiffies);
973 if (priv->correction > timer->sticks - 1) {
974 priv->correction -= timer->sticks - 1;
975 njiff++;
976 } else {
977 njiff += timer->sticks - priv->correction;
978 priv->correction = 0;
979 }
980 priv->last_expires = priv->tlist.expires = njiff;
981 add_timer(&priv->tlist);
982 return 0;
983 }
984
985 static int snd_timer_s_stop(struct snd_timer * timer)
986 {
987 struct snd_timer_system_private *priv;
988 unsigned long jiff;
989
990 priv = (struct snd_timer_system_private *) timer->private_data;
991 del_timer(&priv->tlist);
992 jiff = jiffies;
993 if (time_before(jiff, priv->last_expires))
994 timer->sticks = priv->last_expires - jiff;
995 else
996 timer->sticks = 1;
997 priv->correction = 0;
998 return 0;
999 }
1000
1001 static struct snd_timer_hardware snd_timer_system =
1002 {
1003 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1004 .resolution = 1000000000L / HZ,
1005 .ticks = 10000000L,
1006 .start = snd_timer_s_start,
1007 .stop = snd_timer_s_stop
1008 };
1009
1010 static void snd_timer_free_system(struct snd_timer *timer)
1011 {
1012 kfree(timer->private_data);
1013 }
1014
1015 static int snd_timer_register_system(void)
1016 {
1017 struct snd_timer *timer;
1018 struct snd_timer_system_private *priv;
1019 int err;
1020
1021 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1022 if (err < 0)
1023 return err;
1024 strcpy(timer->name, "system timer");
1025 timer->hw = snd_timer_system;
1026 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1027 if (priv == NULL) {
1028 snd_timer_free(timer);
1029 return -ENOMEM;
1030 }
1031 init_timer(&priv->tlist);
1032 priv->tlist.function = snd_timer_s_function;
1033 priv->tlist.data = (unsigned long) timer;
1034 timer->private_data = priv;
1035 timer->private_free = snd_timer_free_system;
1036 return snd_timer_global_register(timer);
1037 }
1038
1039 #ifdef CONFIG_PROC_FS
1040 /*
1041 * Info interface
1042 */
1043
1044 static void snd_timer_proc_read(struct snd_info_entry *entry,
1045 struct snd_info_buffer *buffer)
1046 {
1047 struct snd_timer *timer;
1048 struct snd_timer_instance *ti;
1049
1050 mutex_lock(&register_mutex);
1051 list_for_each_entry(timer, &snd_timer_list, device_list) {
1052 switch (timer->tmr_class) {
1053 case SNDRV_TIMER_CLASS_GLOBAL:
1054 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1055 break;
1056 case SNDRV_TIMER_CLASS_CARD:
1057 snd_iprintf(buffer, "C%i-%i: ",
1058 timer->card->number, timer->tmr_device);
1059 break;
1060 case SNDRV_TIMER_CLASS_PCM:
1061 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1062 timer->tmr_device, timer->tmr_subdevice);
1063 break;
1064 default:
1065 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1066 timer->card ? timer->card->number : -1,
1067 timer->tmr_device, timer->tmr_subdevice);
1068 }
1069 snd_iprintf(buffer, "%s :", timer->name);
1070 if (timer->hw.resolution)
1071 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1072 timer->hw.resolution / 1000,
1073 timer->hw.resolution % 1000,
1074 timer->hw.ticks);
1075 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1076 snd_iprintf(buffer, " SLAVE");
1077 snd_iprintf(buffer, "\n");
1078 list_for_each_entry(ti, &timer->open_list_head, open_list)
1079 snd_iprintf(buffer, " Client %s : %s\n",
1080 ti->owner ? ti->owner : "unknown",
1081 ti->flags & (SNDRV_TIMER_IFLG_START |
1082 SNDRV_TIMER_IFLG_RUNNING)
1083 ? "running" : "stopped");
1084 }
1085 mutex_unlock(&register_mutex);
1086 }
1087
1088 static struct snd_info_entry *snd_timer_proc_entry;
1089
1090 static void __init snd_timer_proc_init(void)
1091 {
1092 struct snd_info_entry *entry;
1093
1094 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1095 if (entry != NULL) {
1096 entry->c.text.read = snd_timer_proc_read;
1097 if (snd_info_register(entry) < 0) {
1098 snd_info_free_entry(entry);
1099 entry = NULL;
1100 }
1101 }
1102 snd_timer_proc_entry = entry;
1103 }
1104
1105 static void __exit snd_timer_proc_done(void)
1106 {
1107 snd_info_free_entry(snd_timer_proc_entry);
1108 }
1109 #else /* !CONFIG_PROC_FS */
1110 #define snd_timer_proc_init()
1111 #define snd_timer_proc_done()
1112 #endif
1113
1114 /*
1115 * USER SPACE interface
1116 */
1117
1118 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1119 unsigned long resolution,
1120 unsigned long ticks)
1121 {
1122 struct snd_timer_user *tu = timeri->callback_data;
1123 struct snd_timer_read *r;
1124 int prev;
1125
1126 spin_lock(&tu->qlock);
1127 if (tu->qused > 0) {
1128 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1129 r = &tu->queue[prev];
1130 if (r->resolution == resolution) {
1131 r->ticks += ticks;
1132 goto __wake;
1133 }
1134 }
1135 if (tu->qused >= tu->queue_size) {
1136 tu->overrun++;
1137 } else {
1138 r = &tu->queue[tu->qtail++];
1139 tu->qtail %= tu->queue_size;
1140 r->resolution = resolution;
1141 r->ticks = ticks;
1142 tu->qused++;
1143 }
1144 __wake:
1145 spin_unlock(&tu->qlock);
1146 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1147 wake_up(&tu->qchange_sleep);
1148 }
1149
1150 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1151 struct snd_timer_tread *tread)
1152 {
1153 if (tu->qused >= tu->queue_size) {
1154 tu->overrun++;
1155 } else {
1156 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1157 tu->qtail %= tu->queue_size;
1158 tu->qused++;
1159 }
1160 }
1161
1162 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1163 int event,
1164 struct timespec *tstamp,
1165 unsigned long resolution)
1166 {
1167 struct snd_timer_user *tu = timeri->callback_data;
1168 struct snd_timer_tread r1;
1169 unsigned long flags;
1170
1171 if (event >= SNDRV_TIMER_EVENT_START &&
1172 event <= SNDRV_TIMER_EVENT_PAUSE)
1173 tu->tstamp = *tstamp;
1174 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1175 return;
1176 r1.event = event;
1177 r1.tstamp = *tstamp;
1178 r1.val = resolution;
1179 spin_lock_irqsave(&tu->qlock, flags);
1180 snd_timer_user_append_to_tqueue(tu, &r1);
1181 spin_unlock_irqrestore(&tu->qlock, flags);
1182 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1183 wake_up(&tu->qchange_sleep);
1184 }
1185
1186 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1187 unsigned long resolution,
1188 unsigned long ticks)
1189 {
1190 struct snd_timer_user *tu = timeri->callback_data;
1191 struct snd_timer_tread *r, r1;
1192 struct timespec tstamp;
1193 int prev, append = 0;
1194
1195 memset(&tstamp, 0, sizeof(tstamp));
1196 spin_lock(&tu->qlock);
1197 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1198 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1199 spin_unlock(&tu->qlock);
1200 return;
1201 }
1202 if (tu->last_resolution != resolution || ticks > 0) {
1203 if (timer_tstamp_monotonic)
1204 do_posix_clock_monotonic_gettime(&tstamp);
1205 else
1206 getnstimeofday(&tstamp);
1207 }
1208 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1209 tu->last_resolution != resolution) {
1210 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1211 r1.tstamp = tstamp;
1212 r1.val = resolution;
1213 snd_timer_user_append_to_tqueue(tu, &r1);
1214 tu->last_resolution = resolution;
1215 append++;
1216 }
1217 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1218 goto __wake;
1219 if (ticks == 0)
1220 goto __wake;
1221 if (tu->qused > 0) {
1222 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1223 r = &tu->tqueue[prev];
1224 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1225 r->tstamp = tstamp;
1226 r->val += ticks;
1227 append++;
1228 goto __wake;
1229 }
1230 }
1231 r1.event = SNDRV_TIMER_EVENT_TICK;
1232 r1.tstamp = tstamp;
1233 r1.val = ticks;
1234 snd_timer_user_append_to_tqueue(tu, &r1);
1235 append++;
1236 __wake:
1237 spin_unlock(&tu->qlock);
1238 if (append == 0)
1239 return;
1240 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1241 wake_up(&tu->qchange_sleep);
1242 }
1243
1244 static int snd_timer_user_open(struct inode *inode, struct file *file)
1245 {
1246 struct snd_timer_user *tu;
1247 int err;
1248
1249 err = nonseekable_open(inode, file);
1250 if (err < 0)
1251 return err;
1252
1253 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1254 if (tu == NULL)
1255 return -ENOMEM;
1256 spin_lock_init(&tu->qlock);
1257 init_waitqueue_head(&tu->qchange_sleep);
1258 mutex_init(&tu->tread_sem);
1259 tu->ticks = 1;
1260 tu->queue_size = 128;
1261 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1262 GFP_KERNEL);
1263 if (tu->queue == NULL) {
1264 kfree(tu);
1265 return -ENOMEM;
1266 }
1267 file->private_data = tu;
1268 return 0;
1269 }
1270
1271 static int snd_timer_user_release(struct inode *inode, struct file *file)
1272 {
1273 struct snd_timer_user *tu;
1274
1275 if (file->private_data) {
1276 tu = file->private_data;
1277 file->private_data = NULL;
1278 if (tu->timeri)
1279 snd_timer_close(tu->timeri);
1280 kfree(tu->queue);
1281 kfree(tu->tqueue);
1282 kfree(tu);
1283 }
1284 return 0;
1285 }
1286
1287 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1288 {
1289 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1290 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1291 id->card = -1;
1292 id->device = -1;
1293 id->subdevice = -1;
1294 }
1295
1296 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1297 {
1298 id->dev_class = timer->tmr_class;
1299 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1300 id->card = timer->card ? timer->card->number : -1;
1301 id->device = timer->tmr_device;
1302 id->subdevice = timer->tmr_subdevice;
1303 }
1304
1305 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1306 {
1307 struct snd_timer_id id;
1308 struct snd_timer *timer;
1309 struct list_head *p;
1310
1311 if (copy_from_user(&id, _tid, sizeof(id)))
1312 return -EFAULT;
1313 mutex_lock(&register_mutex);
1314 if (id.dev_class < 0) { /* first item */
1315 if (list_empty(&snd_timer_list))
1316 snd_timer_user_zero_id(&id);
1317 else {
1318 timer = list_entry(snd_timer_list.next,
1319 struct snd_timer, device_list);
1320 snd_timer_user_copy_id(&id, timer);
1321 }
1322 } else {
1323 switch (id.dev_class) {
1324 case SNDRV_TIMER_CLASS_GLOBAL:
1325 id.device = id.device < 0 ? 0 : id.device + 1;
1326 list_for_each(p, &snd_timer_list) {
1327 timer = list_entry(p, struct snd_timer, device_list);
1328 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1329 snd_timer_user_copy_id(&id, timer);
1330 break;
1331 }
1332 if (timer->tmr_device >= id.device) {
1333 snd_timer_user_copy_id(&id, timer);
1334 break;
1335 }
1336 }
1337 if (p == &snd_timer_list)
1338 snd_timer_user_zero_id(&id);
1339 break;
1340 case SNDRV_TIMER_CLASS_CARD:
1341 case SNDRV_TIMER_CLASS_PCM:
1342 if (id.card < 0) {
1343 id.card = 0;
1344 } else {
1345 if (id.card < 0) {
1346 id.card = 0;
1347 } else {
1348 if (id.device < 0) {
1349 id.device = 0;
1350 } else {
1351 if (id.subdevice < 0) {
1352 id.subdevice = 0;
1353 } else {
1354 id.subdevice++;
1355 }
1356 }
1357 }
1358 }
1359 list_for_each(p, &snd_timer_list) {
1360 timer = list_entry(p, struct snd_timer, device_list);
1361 if (timer->tmr_class > id.dev_class) {
1362 snd_timer_user_copy_id(&id, timer);
1363 break;
1364 }
1365 if (timer->tmr_class < id.dev_class)
1366 continue;
1367 if (timer->card->number > id.card) {
1368 snd_timer_user_copy_id(&id, timer);
1369 break;
1370 }
1371 if (timer->card->number < id.card)
1372 continue;
1373 if (timer->tmr_device > id.device) {
1374 snd_timer_user_copy_id(&id, timer);
1375 break;
1376 }
1377 if (timer->tmr_device < id.device)
1378 continue;
1379 if (timer->tmr_subdevice > id.subdevice) {
1380 snd_timer_user_copy_id(&id, timer);
1381 break;
1382 }
1383 if (timer->tmr_subdevice < id.subdevice)
1384 continue;
1385 snd_timer_user_copy_id(&id, timer);
1386 break;
1387 }
1388 if (p == &snd_timer_list)
1389 snd_timer_user_zero_id(&id);
1390 break;
1391 default:
1392 snd_timer_user_zero_id(&id);
1393 }
1394 }
1395 mutex_unlock(&register_mutex);
1396 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1397 return -EFAULT;
1398 return 0;
1399 }
1400
1401 static int snd_timer_user_ginfo(struct file *file,
1402 struct snd_timer_ginfo __user *_ginfo)
1403 {
1404 struct snd_timer_ginfo *ginfo;
1405 struct snd_timer_id tid;
1406 struct snd_timer *t;
1407 struct list_head *p;
1408 int err = 0;
1409
1410 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1411 if (IS_ERR(ginfo))
1412 return PTR_ERR(ginfo);
1413
1414 tid = ginfo->tid;
1415 memset(ginfo, 0, sizeof(*ginfo));
1416 ginfo->tid = tid;
1417 mutex_lock(&register_mutex);
1418 t = snd_timer_find(&tid);
1419 if (t != NULL) {
1420 ginfo->card = t->card ? t->card->number : -1;
1421 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1422 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1423 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1424 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1425 ginfo->resolution = t->hw.resolution;
1426 if (t->hw.resolution_min > 0) {
1427 ginfo->resolution_min = t->hw.resolution_min;
1428 ginfo->resolution_max = t->hw.resolution_max;
1429 }
1430 list_for_each(p, &t->open_list_head) {
1431 ginfo->clients++;
1432 }
1433 } else {
1434 err = -ENODEV;
1435 }
1436 mutex_unlock(&register_mutex);
1437 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1438 err = -EFAULT;
1439 kfree(ginfo);
1440 return err;
1441 }
1442
1443 static int snd_timer_user_gparams(struct file *file,
1444 struct snd_timer_gparams __user *_gparams)
1445 {
1446 struct snd_timer_gparams gparams;
1447 struct snd_timer *t;
1448 int err;
1449
1450 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1451 return -EFAULT;
1452 mutex_lock(&register_mutex);
1453 t = snd_timer_find(&gparams.tid);
1454 if (!t) {
1455 err = -ENODEV;
1456 goto _error;
1457 }
1458 if (!list_empty(&t->open_list_head)) {
1459 err = -EBUSY;
1460 goto _error;
1461 }
1462 if (!t->hw.set_period) {
1463 err = -ENOSYS;
1464 goto _error;
1465 }
1466 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1467 _error:
1468 mutex_unlock(&register_mutex);
1469 return err;
1470 }
1471
1472 static int snd_timer_user_gstatus(struct file *file,
1473 struct snd_timer_gstatus __user *_gstatus)
1474 {
1475 struct snd_timer_gstatus gstatus;
1476 struct snd_timer_id tid;
1477 struct snd_timer *t;
1478 int err = 0;
1479
1480 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1481 return -EFAULT;
1482 tid = gstatus.tid;
1483 memset(&gstatus, 0, sizeof(gstatus));
1484 gstatus.tid = tid;
1485 mutex_lock(&register_mutex);
1486 t = snd_timer_find(&tid);
1487 if (t != NULL) {
1488 if (t->hw.c_resolution)
1489 gstatus.resolution = t->hw.c_resolution(t);
1490 else
1491 gstatus.resolution = t->hw.resolution;
1492 if (t->hw.precise_resolution) {
1493 t->hw.precise_resolution(t, &gstatus.resolution_num,
1494 &gstatus.resolution_den);
1495 } else {
1496 gstatus.resolution_num = gstatus.resolution;
1497 gstatus.resolution_den = 1000000000uL;
1498 }
1499 } else {
1500 err = -ENODEV;
1501 }
1502 mutex_unlock(&register_mutex);
1503 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1504 err = -EFAULT;
1505 return err;
1506 }
1507
1508 static int snd_timer_user_tselect(struct file *file,
1509 struct snd_timer_select __user *_tselect)
1510 {
1511 struct snd_timer_user *tu;
1512 struct snd_timer_select tselect;
1513 char str[32];
1514 int err = 0;
1515
1516 tu = file->private_data;
1517 mutex_lock(&tu->tread_sem);
1518 if (tu->timeri) {
1519 snd_timer_close(tu->timeri);
1520 tu->timeri = NULL;
1521 }
1522 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1523 err = -EFAULT;
1524 goto __err;
1525 }
1526 sprintf(str, "application %i", current->pid);
1527 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1528 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1529 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1530 if (err < 0)
1531 goto __err;
1532
1533 kfree(tu->queue);
1534 tu->queue = NULL;
1535 kfree(tu->tqueue);
1536 tu->tqueue = NULL;
1537 if (tu->tread) {
1538 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1539 GFP_KERNEL);
1540 if (tu->tqueue == NULL)
1541 err = -ENOMEM;
1542 } else {
1543 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1544 GFP_KERNEL);
1545 if (tu->queue == NULL)
1546 err = -ENOMEM;
1547 }
1548
1549 if (err < 0) {
1550 snd_timer_close(tu->timeri);
1551 tu->timeri = NULL;
1552 } else {
1553 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1554 tu->timeri->callback = tu->tread
1555 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1556 tu->timeri->ccallback = snd_timer_user_ccallback;
1557 tu->timeri->callback_data = (void *)tu;
1558 }
1559
1560 __err:
1561 mutex_unlock(&tu->tread_sem);
1562 return err;
1563 }
1564
1565 static int snd_timer_user_info(struct file *file,
1566 struct snd_timer_info __user *_info)
1567 {
1568 struct snd_timer_user *tu;
1569 struct snd_timer_info *info;
1570 struct snd_timer *t;
1571 int err = 0;
1572
1573 tu = file->private_data;
1574 if (!tu->timeri)
1575 return -EBADFD;
1576 t = tu->timeri->timer;
1577 if (!t)
1578 return -EBADFD;
1579
1580 info = kzalloc(sizeof(*info), GFP_KERNEL);
1581 if (! info)
1582 return -ENOMEM;
1583 info->card = t->card ? t->card->number : -1;
1584 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1585 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1586 strlcpy(info->id, t->id, sizeof(info->id));
1587 strlcpy(info->name, t->name, sizeof(info->name));
1588 info->resolution = t->hw.resolution;
1589 if (copy_to_user(_info, info, sizeof(*_info)))
1590 err = -EFAULT;
1591 kfree(info);
1592 return err;
1593 }
1594
1595 static int snd_timer_user_params(struct file *file,
1596 struct snd_timer_params __user *_params)
1597 {
1598 struct snd_timer_user *tu;
1599 struct snd_timer_params params;
1600 struct snd_timer *t;
1601 struct snd_timer_read *tr;
1602 struct snd_timer_tread *ttr;
1603 int err;
1604
1605 tu = file->private_data;
1606 if (!tu->timeri)
1607 return -EBADFD;
1608 t = tu->timeri->timer;
1609 if (!t)
1610 return -EBADFD;
1611 if (copy_from_user(&params, _params, sizeof(params)))
1612 return -EFAULT;
1613 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1614 err = -EINVAL;
1615 goto _end;
1616 }
1617 if (params.queue_size > 0 &&
1618 (params.queue_size < 32 || params.queue_size > 1024)) {
1619 err = -EINVAL;
1620 goto _end;
1621 }
1622 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1623 (1<<SNDRV_TIMER_EVENT_TICK)|
1624 (1<<SNDRV_TIMER_EVENT_START)|
1625 (1<<SNDRV_TIMER_EVENT_STOP)|
1626 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1627 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1628 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1629 (1<<SNDRV_TIMER_EVENT_RESUME)|
1630 (1<<SNDRV_TIMER_EVENT_MSTART)|
1631 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1632 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1633 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1634 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1635 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1636 err = -EINVAL;
1637 goto _end;
1638 }
1639 snd_timer_stop(tu->timeri);
1640 spin_lock_irq(&t->lock);
1641 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1642 SNDRV_TIMER_IFLG_EXCLUSIVE|
1643 SNDRV_TIMER_IFLG_EARLY_EVENT);
1644 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1645 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1646 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1647 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1648 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1649 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1650 spin_unlock_irq(&t->lock);
1651 if (params.queue_size > 0 &&
1652 (unsigned int)tu->queue_size != params.queue_size) {
1653 if (tu->tread) {
1654 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1655 GFP_KERNEL);
1656 if (ttr) {
1657 kfree(tu->tqueue);
1658 tu->queue_size = params.queue_size;
1659 tu->tqueue = ttr;
1660 }
1661 } else {
1662 tr = kmalloc(params.queue_size * sizeof(*tr),
1663 GFP_KERNEL);
1664 if (tr) {
1665 kfree(tu->queue);
1666 tu->queue_size = params.queue_size;
1667 tu->queue = tr;
1668 }
1669 }
1670 }
1671 tu->qhead = tu->qtail = tu->qused = 0;
1672 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1673 if (tu->tread) {
1674 struct snd_timer_tread tread;
1675 tread.event = SNDRV_TIMER_EVENT_EARLY;
1676 tread.tstamp.tv_sec = 0;
1677 tread.tstamp.tv_nsec = 0;
1678 tread.val = 0;
1679 snd_timer_user_append_to_tqueue(tu, &tread);
1680 } else {
1681 struct snd_timer_read *r = &tu->queue[0];
1682 r->resolution = 0;
1683 r->ticks = 0;
1684 tu->qused++;
1685 tu->qtail++;
1686 }
1687 }
1688 tu->filter = params.filter;
1689 tu->ticks = params.ticks;
1690 err = 0;
1691 _end:
1692 if (copy_to_user(_params, &params, sizeof(params)))
1693 return -EFAULT;
1694 return err;
1695 }
1696
1697 static int snd_timer_user_status(struct file *file,
1698 struct snd_timer_status __user *_status)
1699 {
1700 struct snd_timer_user *tu;
1701 struct snd_timer_status status;
1702
1703 tu = file->private_data;
1704 if (!tu->timeri)
1705 return -EBADFD;
1706 memset(&status, 0, sizeof(status));
1707 status.tstamp = tu->tstamp;
1708 status.resolution = snd_timer_resolution(tu->timeri);
1709 status.lost = tu->timeri->lost;
1710 status.overrun = tu->overrun;
1711 spin_lock_irq(&tu->qlock);
1712 status.queue = tu->qused;
1713 spin_unlock_irq(&tu->qlock);
1714 if (copy_to_user(_status, &status, sizeof(status)))
1715 return -EFAULT;
1716 return 0;
1717 }
1718
1719 static int snd_timer_user_start(struct file *file)
1720 {
1721 int err;
1722 struct snd_timer_user *tu;
1723
1724 tu = file->private_data;
1725 if (!tu->timeri)
1726 return -EBADFD;
1727 snd_timer_stop(tu->timeri);
1728 tu->timeri->lost = 0;
1729 tu->last_resolution = 0;
1730 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1731 }
1732
1733 static int snd_timer_user_stop(struct file *file)
1734 {
1735 int err;
1736 struct snd_timer_user *tu;
1737
1738 tu = file->private_data;
1739 if (!tu->timeri)
1740 return -EBADFD;
1741 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1742 }
1743
1744 static int snd_timer_user_continue(struct file *file)
1745 {
1746 int err;
1747 struct snd_timer_user *tu;
1748
1749 tu = file->private_data;
1750 if (!tu->timeri)
1751 return -EBADFD;
1752 tu->timeri->lost = 0;
1753 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1754 }
1755
1756 static int snd_timer_user_pause(struct file *file)
1757 {
1758 int err;
1759 struct snd_timer_user *tu;
1760
1761 tu = file->private_data;
1762 if (!tu->timeri)
1763 return -EBADFD;
1764 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1765 }
1766
1767 enum {
1768 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1769 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1770 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1771 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1772 };
1773
1774 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1775 unsigned long arg)
1776 {
1777 struct snd_timer_user *tu;
1778 void __user *argp = (void __user *)arg;
1779 int __user *p = argp;
1780
1781 tu = file->private_data;
1782 switch (cmd) {
1783 case SNDRV_TIMER_IOCTL_PVERSION:
1784 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1785 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1786 return snd_timer_user_next_device(argp);
1787 case SNDRV_TIMER_IOCTL_TREAD:
1788 {
1789 int xarg;
1790
1791 mutex_lock(&tu->tread_sem);
1792 if (tu->timeri) { /* too late */
1793 mutex_unlock(&tu->tread_sem);
1794 return -EBUSY;
1795 }
1796 if (get_user(xarg, p)) {
1797 mutex_unlock(&tu->tread_sem);
1798 return -EFAULT;
1799 }
1800 tu->tread = xarg ? 1 : 0;
1801 mutex_unlock(&tu->tread_sem);
1802 return 0;
1803 }
1804 case SNDRV_TIMER_IOCTL_GINFO:
1805 return snd_timer_user_ginfo(file, argp);
1806 case SNDRV_TIMER_IOCTL_GPARAMS:
1807 return snd_timer_user_gparams(file, argp);
1808 case SNDRV_TIMER_IOCTL_GSTATUS:
1809 return snd_timer_user_gstatus(file, argp);
1810 case SNDRV_TIMER_IOCTL_SELECT:
1811 return snd_timer_user_tselect(file, argp);
1812 case SNDRV_TIMER_IOCTL_INFO:
1813 return snd_timer_user_info(file, argp);
1814 case SNDRV_TIMER_IOCTL_PARAMS:
1815 return snd_timer_user_params(file, argp);
1816 case SNDRV_TIMER_IOCTL_STATUS:
1817 return snd_timer_user_status(file, argp);
1818 case SNDRV_TIMER_IOCTL_START:
1819 case SNDRV_TIMER_IOCTL_START_OLD:
1820 return snd_timer_user_start(file);
1821 case SNDRV_TIMER_IOCTL_STOP:
1822 case SNDRV_TIMER_IOCTL_STOP_OLD:
1823 return snd_timer_user_stop(file);
1824 case SNDRV_TIMER_IOCTL_CONTINUE:
1825 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1826 return snd_timer_user_continue(file);
1827 case SNDRV_TIMER_IOCTL_PAUSE:
1828 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1829 return snd_timer_user_pause(file);
1830 }
1831 return -ENOTTY;
1832 }
1833
1834 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1835 {
1836 struct snd_timer_user *tu;
1837
1838 tu = file->private_data;
1839 return fasync_helper(fd, file, on, &tu->fasync);
1840 }
1841
1842 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1843 size_t count, loff_t *offset)
1844 {
1845 struct snd_timer_user *tu;
1846 long result = 0, unit;
1847 int err = 0;
1848
1849 tu = file->private_data;
1850 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1851 spin_lock_irq(&tu->qlock);
1852 while ((long)count - result >= unit) {
1853 while (!tu->qused) {
1854 wait_queue_t wait;
1855
1856 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1857 err = -EAGAIN;
1858 break;
1859 }
1860
1861 set_current_state(TASK_INTERRUPTIBLE);
1862 init_waitqueue_entry(&wait, current);
1863 add_wait_queue(&tu->qchange_sleep, &wait);
1864
1865 spin_unlock_irq(&tu->qlock);
1866 schedule();
1867 spin_lock_irq(&tu->qlock);
1868
1869 remove_wait_queue(&tu->qchange_sleep, &wait);
1870
1871 if (signal_pending(current)) {
1872 err = -ERESTARTSYS;
1873 break;
1874 }
1875 }
1876
1877 spin_unlock_irq(&tu->qlock);
1878 if (err < 0)
1879 goto _error;
1880
1881 if (tu->tread) {
1882 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1883 sizeof(struct snd_timer_tread))) {
1884 err = -EFAULT;
1885 goto _error;
1886 }
1887 } else {
1888 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1889 sizeof(struct snd_timer_read))) {
1890 err = -EFAULT;
1891 goto _error;
1892 }
1893 }
1894
1895 tu->qhead %= tu->queue_size;
1896
1897 result += unit;
1898 buffer += unit;
1899
1900 spin_lock_irq(&tu->qlock);
1901 tu->qused--;
1902 }
1903 spin_unlock_irq(&tu->qlock);
1904 _error:
1905 return result > 0 ? result : err;
1906 }
1907
1908 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1909 {
1910 unsigned int mask;
1911 struct snd_timer_user *tu;
1912
1913 tu = file->private_data;
1914
1915 poll_wait(file, &tu->qchange_sleep, wait);
1916
1917 mask = 0;
1918 if (tu->qused)
1919 mask |= POLLIN | POLLRDNORM;
1920
1921 return mask;
1922 }
1923
1924 #ifdef CONFIG_COMPAT
1925 #include "timer_compat.c"
1926 #else
1927 #define snd_timer_user_ioctl_compat NULL
1928 #endif
1929
1930 static const struct file_operations snd_timer_f_ops =
1931 {
1932 .owner = THIS_MODULE,
1933 .read = snd_timer_user_read,
1934 .open = snd_timer_user_open,
1935 .release = snd_timer_user_release,
1936 .llseek = no_llseek,
1937 .poll = snd_timer_user_poll,
1938 .unlocked_ioctl = snd_timer_user_ioctl,
1939 .compat_ioctl = snd_timer_user_ioctl_compat,
1940 .fasync = snd_timer_user_fasync,
1941 };
1942
1943 /*
1944 * ENTRY functions
1945 */
1946
1947 static int __init alsa_timer_init(void)
1948 {
1949 int err;
1950
1951 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1952 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1953 "system timer");
1954 #endif
1955
1956 if ((err = snd_timer_register_system()) < 0)
1957 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1958 err);
1959 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1960 &snd_timer_f_ops, NULL, "timer")) < 0)
1961 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1962 err);
1963 snd_timer_proc_init();
1964 return 0;
1965 }
1966
1967 static void __exit alsa_timer_exit(void)
1968 {
1969 struct list_head *p, *n;
1970
1971 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1972 /* unregister the system timer */
1973 list_for_each_safe(p, n, &snd_timer_list) {
1974 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1975 snd_timer_free(timer);
1976 }
1977 snd_timer_proc_done();
1978 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1979 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1980 #endif
1981 }
1982
1983 module_init(alsa_timer_init)
1984 module_exit(alsa_timer_exit)
1985
1986 EXPORT_SYMBOL(snd_timer_open);
1987 EXPORT_SYMBOL(snd_timer_close);
1988 EXPORT_SYMBOL(snd_timer_resolution);
1989 EXPORT_SYMBOL(snd_timer_start);
1990 EXPORT_SYMBOL(snd_timer_stop);
1991 EXPORT_SYMBOL(snd_timer_continue);
1992 EXPORT_SYMBOL(snd_timer_pause);
1993 EXPORT_SYMBOL(snd_timer_new);
1994 EXPORT_SYMBOL(snd_timer_notify);
1995 EXPORT_SYMBOL(snd_timer_global_new);
1996 EXPORT_SYMBOL(snd_timer_global_free);
1997 EXPORT_SYMBOL(snd_timer_global_register);
1998 EXPORT_SYMBOL(snd_timer_interrupt);
linux-next