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