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Merge tag 'drivers-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[deliverable/linux.git] / sound / core / timer.c
1 /*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <linux/device.h>
28 #include <linux/module.h>
29 #include <linux/string.h>
30 #include <sound/core.h>
31 #include <sound/timer.h>
32 #include <sound/control.h>
33 #include <sound/info.h>
34 #include <sound/minors.h>
35 #include <sound/initval.h>
36 #include <linux/kmod.h>
37
38 #if IS_ENABLED(CONFIG_SND_HRTIMER)
39 #define DEFAULT_TIMER_LIMIT 4
40 #elif IS_ENABLED(CONFIG_SND_RTCTIMER)
41 #define DEFAULT_TIMER_LIMIT 2
42 #else
43 #define DEFAULT_TIMER_LIMIT 1
44 #endif
45
46 static int timer_limit = DEFAULT_TIMER_LIMIT;
47 static int timer_tstamp_monotonic = 1;
48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
49 MODULE_DESCRIPTION("ALSA timer interface");
50 MODULE_LICENSE("GPL");
51 module_param(timer_limit, int, 0444);
52 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
53 module_param(timer_tstamp_monotonic, int, 0444);
54 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
55
56 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
57 MODULE_ALIAS("devname:snd/timer");
58
59 struct snd_timer_user {
60 struct snd_timer_instance *timeri;
61 int tread; /* enhanced read with timestamps and events */
62 unsigned long ticks;
63 unsigned long overrun;
64 int qhead;
65 int qtail;
66 int qused;
67 int queue_size;
68 struct snd_timer_read *queue;
69 struct snd_timer_tread *tqueue;
70 spinlock_t qlock;
71 unsigned long last_resolution;
72 unsigned int filter;
73 struct timespec tstamp; /* trigger tstamp */
74 wait_queue_head_t qchange_sleep;
75 struct fasync_struct *fasync;
76 struct mutex tread_sem;
77 };
78
79 /* list of timers */
80 static LIST_HEAD(snd_timer_list);
81
82 /* list of slave instances */
83 static LIST_HEAD(snd_timer_slave_list);
84
85 /* lock for slave active lists */
86 static DEFINE_SPINLOCK(slave_active_lock);
87
88 static DEFINE_MUTEX(register_mutex);
89
90 static int snd_timer_free(struct snd_timer *timer);
91 static int snd_timer_dev_free(struct snd_device *device);
92 static int snd_timer_dev_register(struct snd_device *device);
93 static int snd_timer_dev_disconnect(struct snd_device *device);
94
95 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
96
97 /*
98 * create a timer instance with the given owner string.
99 * when timer is not NULL, increments the module counter
100 */
101 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
102 struct snd_timer *timer)
103 {
104 struct snd_timer_instance *timeri;
105 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
106 if (timeri == NULL)
107 return NULL;
108 timeri->owner = kstrdup(owner, GFP_KERNEL);
109 if (! timeri->owner) {
110 kfree(timeri);
111 return NULL;
112 }
113 INIT_LIST_HEAD(&timeri->open_list);
114 INIT_LIST_HEAD(&timeri->active_list);
115 INIT_LIST_HEAD(&timeri->ack_list);
116 INIT_LIST_HEAD(&timeri->slave_list_head);
117 INIT_LIST_HEAD(&timeri->slave_active_head);
118
119 timeri->timer = timer;
120 if (timer && !try_module_get(timer->module)) {
121 kfree(timeri->owner);
122 kfree(timeri);
123 return NULL;
124 }
125
126 return timeri;
127 }
128
129 /*
130 * find a timer instance from the given timer id
131 */
132 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
133 {
134 struct snd_timer *timer = NULL;
135
136 list_for_each_entry(timer, &snd_timer_list, device_list) {
137 if (timer->tmr_class != tid->dev_class)
138 continue;
139 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
140 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
141 (timer->card == NULL ||
142 timer->card->number != tid->card))
143 continue;
144 if (timer->tmr_device != tid->device)
145 continue;
146 if (timer->tmr_subdevice != tid->subdevice)
147 continue;
148 return timer;
149 }
150 return NULL;
151 }
152
153 #ifdef CONFIG_MODULES
154
155 static void snd_timer_request(struct snd_timer_id *tid)
156 {
157 switch (tid->dev_class) {
158 case SNDRV_TIMER_CLASS_GLOBAL:
159 if (tid->device < timer_limit)
160 request_module("snd-timer-%i", tid->device);
161 break;
162 case SNDRV_TIMER_CLASS_CARD:
163 case SNDRV_TIMER_CLASS_PCM:
164 if (tid->card < snd_ecards_limit)
165 request_module("snd-card-%i", tid->card);
166 break;
167 default:
168 break;
169 }
170 }
171
172 #endif
173
174 /*
175 * look for a master instance matching with the slave id of the given slave.
176 * when found, relink the open_link of the slave.
177 *
178 * call this with register_mutex down.
179 */
180 static void snd_timer_check_slave(struct snd_timer_instance *slave)
181 {
182 struct snd_timer *timer;
183 struct snd_timer_instance *master;
184
185 /* FIXME: it's really dumb to look up all entries.. */
186 list_for_each_entry(timer, &snd_timer_list, device_list) {
187 list_for_each_entry(master, &timer->open_list_head, open_list) {
188 if (slave->slave_class == master->slave_class &&
189 slave->slave_id == master->slave_id) {
190 list_move_tail(&slave->open_list,
191 &master->slave_list_head);
192 spin_lock_irq(&slave_active_lock);
193 slave->master = master;
194 slave->timer = master->timer;
195 spin_unlock_irq(&slave_active_lock);
196 return;
197 }
198 }
199 }
200 }
201
202 /*
203 * look for slave instances matching with the slave id of the given master.
204 * when found, relink the open_link of slaves.
205 *
206 * call this with register_mutex down.
207 */
208 static void snd_timer_check_master(struct snd_timer_instance *master)
209 {
210 struct snd_timer_instance *slave, *tmp;
211
212 /* check all pending slaves */
213 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
214 if (slave->slave_class == master->slave_class &&
215 slave->slave_id == master->slave_id) {
216 list_move_tail(&slave->open_list, &master->slave_list_head);
217 spin_lock_irq(&slave_active_lock);
218 slave->master = master;
219 slave->timer = master->timer;
220 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
221 list_add_tail(&slave->active_list,
222 &master->slave_active_head);
223 spin_unlock_irq(&slave_active_lock);
224 }
225 }
226 }
227
228 /*
229 * open a timer instance
230 * when opening a master, the slave id must be here given.
231 */
232 int snd_timer_open(struct snd_timer_instance **ti,
233 char *owner, struct snd_timer_id *tid,
234 unsigned int slave_id)
235 {
236 struct snd_timer *timer;
237 struct snd_timer_instance *timeri = NULL;
238
239 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
240 /* open a slave instance */
241 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
242 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
243 pr_debug("ALSA: timer: invalid slave class %i\n",
244 tid->dev_sclass);
245 return -EINVAL;
246 }
247 mutex_lock(&register_mutex);
248 timeri = snd_timer_instance_new(owner, NULL);
249 if (!timeri) {
250 mutex_unlock(&register_mutex);
251 return -ENOMEM;
252 }
253 timeri->slave_class = tid->dev_sclass;
254 timeri->slave_id = tid->device;
255 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
256 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
257 snd_timer_check_slave(timeri);
258 mutex_unlock(&register_mutex);
259 *ti = timeri;
260 return 0;
261 }
262
263 /* open a master instance */
264 mutex_lock(&register_mutex);
265 timer = snd_timer_find(tid);
266 #ifdef CONFIG_MODULES
267 if (!timer) {
268 mutex_unlock(&register_mutex);
269 snd_timer_request(tid);
270 mutex_lock(&register_mutex);
271 timer = snd_timer_find(tid);
272 }
273 #endif
274 if (!timer) {
275 mutex_unlock(&register_mutex);
276 return -ENODEV;
277 }
278 if (!list_empty(&timer->open_list_head)) {
279 timeri = list_entry(timer->open_list_head.next,
280 struct snd_timer_instance, open_list);
281 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
282 mutex_unlock(&register_mutex);
283 return -EBUSY;
284 }
285 }
286 timeri = snd_timer_instance_new(owner, timer);
287 if (!timeri) {
288 mutex_unlock(&register_mutex);
289 return -ENOMEM;
290 }
291 timeri->slave_class = tid->dev_sclass;
292 timeri->slave_id = slave_id;
293 if (list_empty(&timer->open_list_head) && timer->hw.open)
294 timer->hw.open(timer);
295 list_add_tail(&timeri->open_list, &timer->open_list_head);
296 snd_timer_check_master(timeri);
297 mutex_unlock(&register_mutex);
298 *ti = timeri;
299 return 0;
300 }
301
302 static int _snd_timer_stop(struct snd_timer_instance *timeri,
303 int keep_flag, int event);
304
305 /*
306 * close a timer instance
307 */
308 int snd_timer_close(struct snd_timer_instance *timeri)
309 {
310 struct snd_timer *timer = NULL;
311 struct snd_timer_instance *slave, *tmp;
312
313 if (snd_BUG_ON(!timeri))
314 return -ENXIO;
315
316 /* force to stop the timer */
317 snd_timer_stop(timeri);
318
319 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
320 /* wait, until the active callback is finished */
321 spin_lock_irq(&slave_active_lock);
322 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
323 spin_unlock_irq(&slave_active_lock);
324 udelay(10);
325 spin_lock_irq(&slave_active_lock);
326 }
327 spin_unlock_irq(&slave_active_lock);
328 mutex_lock(&register_mutex);
329 list_del(&timeri->open_list);
330 mutex_unlock(&register_mutex);
331 } else {
332 timer = timeri->timer;
333 if (snd_BUG_ON(!timer))
334 goto out;
335 /* wait, until the active callback is finished */
336 spin_lock_irq(&timer->lock);
337 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
338 spin_unlock_irq(&timer->lock);
339 udelay(10);
340 spin_lock_irq(&timer->lock);
341 }
342 spin_unlock_irq(&timer->lock);
343 mutex_lock(&register_mutex);
344 list_del(&timeri->open_list);
345 if (timer && list_empty(&timer->open_list_head) &&
346 timer->hw.close)
347 timer->hw.close(timer);
348 /* remove slave links */
349 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
350 open_list) {
351 spin_lock_irq(&slave_active_lock);
352 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
353 list_move_tail(&slave->open_list, &snd_timer_slave_list);
354 slave->master = NULL;
355 slave->timer = NULL;
356 spin_unlock_irq(&slave_active_lock);
357 }
358 mutex_unlock(&register_mutex);
359 }
360 out:
361 if (timeri->private_free)
362 timeri->private_free(timeri);
363 kfree(timeri->owner);
364 kfree(timeri);
365 if (timer)
366 module_put(timer->module);
367 return 0;
368 }
369
370 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
371 {
372 struct snd_timer * timer;
373
374 if (timeri == NULL)
375 return 0;
376 if ((timer = timeri->timer) != NULL) {
377 if (timer->hw.c_resolution)
378 return timer->hw.c_resolution(timer);
379 return timer->hw.resolution;
380 }
381 return 0;
382 }
383
384 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
385 {
386 struct snd_timer *timer;
387 unsigned long flags;
388 unsigned long resolution = 0;
389 struct snd_timer_instance *ts;
390 struct timespec tstamp;
391
392 if (timer_tstamp_monotonic)
393 do_posix_clock_monotonic_gettime(&tstamp);
394 else
395 getnstimeofday(&tstamp);
396 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
397 event > SNDRV_TIMER_EVENT_PAUSE))
398 return;
399 if (event == SNDRV_TIMER_EVENT_START ||
400 event == SNDRV_TIMER_EVENT_CONTINUE)
401 resolution = snd_timer_resolution(ti);
402 if (ti->ccallback)
403 ti->ccallback(ti, event, &tstamp, resolution);
404 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
405 return;
406 timer = ti->timer;
407 if (timer == NULL)
408 return;
409 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
410 return;
411 spin_lock_irqsave(&timer->lock, flags);
412 list_for_each_entry(ts, &ti->slave_active_head, active_list)
413 if (ts->ccallback)
414 ts->ccallback(ti, event + 100, &tstamp, resolution);
415 spin_unlock_irqrestore(&timer->lock, flags);
416 }
417
418 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
419 unsigned long sticks)
420 {
421 list_move_tail(&timeri->active_list, &timer->active_list_head);
422 if (timer->running) {
423 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
424 goto __start_now;
425 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
426 timeri->flags |= SNDRV_TIMER_IFLG_START;
427 return 1; /* delayed start */
428 } else {
429 timer->sticks = sticks;
430 timer->hw.start(timer);
431 __start_now:
432 timer->running++;
433 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
434 return 0;
435 }
436 }
437
438 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
439 {
440 unsigned long flags;
441
442 spin_lock_irqsave(&slave_active_lock, flags);
443 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
444 if (timeri->master)
445 list_add_tail(&timeri->active_list,
446 &timeri->master->slave_active_head);
447 spin_unlock_irqrestore(&slave_active_lock, flags);
448 return 1; /* delayed start */
449 }
450
451 /*
452 * start the timer instance
453 */
454 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
455 {
456 struct snd_timer *timer;
457 int result = -EINVAL;
458 unsigned long flags;
459
460 if (timeri == NULL || ticks < 1)
461 return -EINVAL;
462 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
463 result = snd_timer_start_slave(timeri);
464 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
465 return result;
466 }
467 timer = timeri->timer;
468 if (timer == NULL)
469 return -EINVAL;
470 spin_lock_irqsave(&timer->lock, flags);
471 timeri->ticks = timeri->cticks = ticks;
472 timeri->pticks = 0;
473 result = snd_timer_start1(timer, timeri, ticks);
474 spin_unlock_irqrestore(&timer->lock, flags);
475 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
476 return result;
477 }
478
479 static int _snd_timer_stop(struct snd_timer_instance * timeri,
480 int keep_flag, int event)
481 {
482 struct snd_timer *timer;
483 unsigned long flags;
484
485 if (snd_BUG_ON(!timeri))
486 return -ENXIO;
487
488 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
489 if (!keep_flag) {
490 spin_lock_irqsave(&slave_active_lock, flags);
491 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
492 spin_unlock_irqrestore(&slave_active_lock, flags);
493 }
494 goto __end;
495 }
496 timer = timeri->timer;
497 if (!timer)
498 return -EINVAL;
499 spin_lock_irqsave(&timer->lock, flags);
500 list_del_init(&timeri->ack_list);
501 list_del_init(&timeri->active_list);
502 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
503 !(--timer->running)) {
504 timer->hw.stop(timer);
505 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
506 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
507 snd_timer_reschedule(timer, 0);
508 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
509 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
510 timer->hw.start(timer);
511 }
512 }
513 }
514 if (!keep_flag)
515 timeri->flags &=
516 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
517 spin_unlock_irqrestore(&timer->lock, flags);
518 __end:
519 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
520 snd_timer_notify1(timeri, event);
521 return 0;
522 }
523
524 /*
525 * stop the timer instance.
526 *
527 * do not call this from the timer callback!
528 */
529 int snd_timer_stop(struct snd_timer_instance *timeri)
530 {
531 struct snd_timer *timer;
532 unsigned long flags;
533 int err;
534
535 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
536 if (err < 0)
537 return err;
538 timer = timeri->timer;
539 if (!timer)
540 return -EINVAL;
541 spin_lock_irqsave(&timer->lock, flags);
542 timeri->cticks = timeri->ticks;
543 timeri->pticks = 0;
544 spin_unlock_irqrestore(&timer->lock, flags);
545 return 0;
546 }
547
548 /*
549 * start again.. the tick is kept.
550 */
551 int snd_timer_continue(struct snd_timer_instance *timeri)
552 {
553 struct snd_timer *timer;
554 int result = -EINVAL;
555 unsigned long flags;
556
557 if (timeri == NULL)
558 return result;
559 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
560 return snd_timer_start_slave(timeri);
561 timer = timeri->timer;
562 if (! timer)
563 return -EINVAL;
564 spin_lock_irqsave(&timer->lock, flags);
565 if (!timeri->cticks)
566 timeri->cticks = 1;
567 timeri->pticks = 0;
568 result = snd_timer_start1(timer, timeri, timer->sticks);
569 spin_unlock_irqrestore(&timer->lock, flags);
570 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
571 return result;
572 }
573
574 /*
575 * pause.. remember the ticks left
576 */
577 int snd_timer_pause(struct snd_timer_instance * timeri)
578 {
579 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
580 }
581
582 /*
583 * reschedule the timer
584 *
585 * start pending instances and check the scheduling ticks.
586 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
587 */
588 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
589 {
590 struct snd_timer_instance *ti;
591 unsigned long ticks = ~0UL;
592
593 list_for_each_entry(ti, &timer->active_list_head, active_list) {
594 if (ti->flags & SNDRV_TIMER_IFLG_START) {
595 ti->flags &= ~SNDRV_TIMER_IFLG_START;
596 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
597 timer->running++;
598 }
599 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
600 if (ticks > ti->cticks)
601 ticks = ti->cticks;
602 }
603 }
604 if (ticks == ~0UL) {
605 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
606 return;
607 }
608 if (ticks > timer->hw.ticks)
609 ticks = timer->hw.ticks;
610 if (ticks_left != ticks)
611 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
612 timer->sticks = ticks;
613 }
614
615 /*
616 * timer tasklet
617 *
618 */
619 static void snd_timer_tasklet(unsigned long arg)
620 {
621 struct snd_timer *timer = (struct snd_timer *) arg;
622 struct snd_timer_instance *ti;
623 struct list_head *p;
624 unsigned long resolution, ticks;
625 unsigned long flags;
626
627 spin_lock_irqsave(&timer->lock, flags);
628 /* now process all callbacks */
629 while (!list_empty(&timer->sack_list_head)) {
630 p = timer->sack_list_head.next; /* get first item */
631 ti = list_entry(p, struct snd_timer_instance, ack_list);
632
633 /* remove from ack_list and make empty */
634 list_del_init(p);
635
636 ticks = ti->pticks;
637 ti->pticks = 0;
638 resolution = ti->resolution;
639
640 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
641 spin_unlock(&timer->lock);
642 if (ti->callback)
643 ti->callback(ti, resolution, ticks);
644 spin_lock(&timer->lock);
645 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
646 }
647 spin_unlock_irqrestore(&timer->lock, flags);
648 }
649
650 /*
651 * timer interrupt
652 *
653 * ticks_left is usually equal to timer->sticks.
654 *
655 */
656 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
657 {
658 struct snd_timer_instance *ti, *ts, *tmp;
659 unsigned long resolution, ticks;
660 struct list_head *p, *ack_list_head;
661 unsigned long flags;
662 int use_tasklet = 0;
663
664 if (timer == NULL)
665 return;
666
667 spin_lock_irqsave(&timer->lock, flags);
668
669 /* remember the current resolution */
670 if (timer->hw.c_resolution)
671 resolution = timer->hw.c_resolution(timer);
672 else
673 resolution = timer->hw.resolution;
674
675 /* loop for all active instances
676 * Here we cannot use list_for_each_entry because the active_list of a
677 * processed instance is relinked to done_list_head before the callback
678 * is called.
679 */
680 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
681 active_list) {
682 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
683 continue;
684 ti->pticks += ticks_left;
685 ti->resolution = resolution;
686 if (ti->cticks < ticks_left)
687 ti->cticks = 0;
688 else
689 ti->cticks -= ticks_left;
690 if (ti->cticks) /* not expired */
691 continue;
692 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
693 ti->cticks = ti->ticks;
694 } else {
695 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
696 if (--timer->running)
697 list_del(&ti->active_list);
698 }
699 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
700 (ti->flags & SNDRV_TIMER_IFLG_FAST))
701 ack_list_head = &timer->ack_list_head;
702 else
703 ack_list_head = &timer->sack_list_head;
704 if (list_empty(&ti->ack_list))
705 list_add_tail(&ti->ack_list, ack_list_head);
706 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
707 ts->pticks = ti->pticks;
708 ts->resolution = resolution;
709 if (list_empty(&ts->ack_list))
710 list_add_tail(&ts->ack_list, ack_list_head);
711 }
712 }
713 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
714 snd_timer_reschedule(timer, timer->sticks);
715 if (timer->running) {
716 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
717 timer->hw.stop(timer);
718 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
719 }
720 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
721 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
722 /* restart timer */
723 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
724 timer->hw.start(timer);
725 }
726 } else {
727 timer->hw.stop(timer);
728 }
729
730 /* now process all fast callbacks */
731 while (!list_empty(&timer->ack_list_head)) {
732 p = timer->ack_list_head.next; /* get first item */
733 ti = list_entry(p, struct snd_timer_instance, ack_list);
734
735 /* remove from ack_list and make empty */
736 list_del_init(p);
737
738 ticks = ti->pticks;
739 ti->pticks = 0;
740
741 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
742 spin_unlock(&timer->lock);
743 if (ti->callback)
744 ti->callback(ti, resolution, ticks);
745 spin_lock(&timer->lock);
746 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
747 }
748
749 /* do we have any slow callbacks? */
750 use_tasklet = !list_empty(&timer->sack_list_head);
751 spin_unlock_irqrestore(&timer->lock, flags);
752
753 if (use_tasklet)
754 tasklet_schedule(&timer->task_queue);
755 }
756
757 /*
758
759 */
760
761 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
762 struct snd_timer **rtimer)
763 {
764 struct snd_timer *timer;
765 int err;
766 static struct snd_device_ops ops = {
767 .dev_free = snd_timer_dev_free,
768 .dev_register = snd_timer_dev_register,
769 .dev_disconnect = snd_timer_dev_disconnect,
770 };
771
772 if (snd_BUG_ON(!tid))
773 return -EINVAL;
774 if (rtimer)
775 *rtimer = NULL;
776 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
777 if (timer == NULL) {
778 pr_err("ALSA: timer: cannot allocate\n");
779 return -ENOMEM;
780 }
781 timer->tmr_class = tid->dev_class;
782 timer->card = card;
783 timer->tmr_device = tid->device;
784 timer->tmr_subdevice = tid->subdevice;
785 if (id)
786 strlcpy(timer->id, id, sizeof(timer->id));
787 INIT_LIST_HEAD(&timer->device_list);
788 INIT_LIST_HEAD(&timer->open_list_head);
789 INIT_LIST_HEAD(&timer->active_list_head);
790 INIT_LIST_HEAD(&timer->ack_list_head);
791 INIT_LIST_HEAD(&timer->sack_list_head);
792 spin_lock_init(&timer->lock);
793 tasklet_init(&timer->task_queue, snd_timer_tasklet,
794 (unsigned long)timer);
795 if (card != NULL) {
796 timer->module = card->module;
797 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
798 if (err < 0) {
799 snd_timer_free(timer);
800 return err;
801 }
802 }
803 if (rtimer)
804 *rtimer = timer;
805 return 0;
806 }
807
808 static int snd_timer_free(struct snd_timer *timer)
809 {
810 if (!timer)
811 return 0;
812
813 mutex_lock(&register_mutex);
814 if (! list_empty(&timer->open_list_head)) {
815 struct list_head *p, *n;
816 struct snd_timer_instance *ti;
817 pr_warn("ALSA: timer %p is busy?\n", timer);
818 list_for_each_safe(p, n, &timer->open_list_head) {
819 list_del_init(p);
820 ti = list_entry(p, struct snd_timer_instance, open_list);
821 ti->timer = NULL;
822 }
823 }
824 list_del(&timer->device_list);
825 mutex_unlock(&register_mutex);
826
827 if (timer->private_free)
828 timer->private_free(timer);
829 kfree(timer);
830 return 0;
831 }
832
833 static int snd_timer_dev_free(struct snd_device *device)
834 {
835 struct snd_timer *timer = device->device_data;
836 return snd_timer_free(timer);
837 }
838
839 static int snd_timer_dev_register(struct snd_device *dev)
840 {
841 struct snd_timer *timer = dev->device_data;
842 struct snd_timer *timer1;
843
844 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
845 return -ENXIO;
846 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
847 !timer->hw.resolution && timer->hw.c_resolution == NULL)
848 return -EINVAL;
849
850 mutex_lock(&register_mutex);
851 list_for_each_entry(timer1, &snd_timer_list, device_list) {
852 if (timer1->tmr_class > timer->tmr_class)
853 break;
854 if (timer1->tmr_class < timer->tmr_class)
855 continue;
856 if (timer1->card && timer->card) {
857 if (timer1->card->number > timer->card->number)
858 break;
859 if (timer1->card->number < timer->card->number)
860 continue;
861 }
862 if (timer1->tmr_device > timer->tmr_device)
863 break;
864 if (timer1->tmr_device < timer->tmr_device)
865 continue;
866 if (timer1->tmr_subdevice > timer->tmr_subdevice)
867 break;
868 if (timer1->tmr_subdevice < timer->tmr_subdevice)
869 continue;
870 /* conflicts.. */
871 mutex_unlock(&register_mutex);
872 return -EBUSY;
873 }
874 list_add_tail(&timer->device_list, &timer1->device_list);
875 mutex_unlock(&register_mutex);
876 return 0;
877 }
878
879 static int snd_timer_dev_disconnect(struct snd_device *device)
880 {
881 struct snd_timer *timer = device->device_data;
882 mutex_lock(&register_mutex);
883 list_del_init(&timer->device_list);
884 mutex_unlock(&register_mutex);
885 return 0;
886 }
887
888 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
889 {
890 unsigned long flags;
891 unsigned long resolution = 0;
892 struct snd_timer_instance *ti, *ts;
893
894 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
895 return;
896 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
897 event > SNDRV_TIMER_EVENT_MRESUME))
898 return;
899 spin_lock_irqsave(&timer->lock, flags);
900 if (event == SNDRV_TIMER_EVENT_MSTART ||
901 event == SNDRV_TIMER_EVENT_MCONTINUE ||
902 event == SNDRV_TIMER_EVENT_MRESUME) {
903 if (timer->hw.c_resolution)
904 resolution = timer->hw.c_resolution(timer);
905 else
906 resolution = timer->hw.resolution;
907 }
908 list_for_each_entry(ti, &timer->active_list_head, active_list) {
909 if (ti->ccallback)
910 ti->ccallback(ti, event, tstamp, resolution);
911 list_for_each_entry(ts, &ti->slave_active_head, active_list)
912 if (ts->ccallback)
913 ts->ccallback(ts, event, tstamp, resolution);
914 }
915 spin_unlock_irqrestore(&timer->lock, flags);
916 }
917
918 /*
919 * exported functions for global timers
920 */
921 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
922 {
923 struct snd_timer_id tid;
924
925 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
926 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
927 tid.card = -1;
928 tid.device = device;
929 tid.subdevice = 0;
930 return snd_timer_new(NULL, id, &tid, rtimer);
931 }
932
933 int snd_timer_global_free(struct snd_timer *timer)
934 {
935 return snd_timer_free(timer);
936 }
937
938 int snd_timer_global_register(struct snd_timer *timer)
939 {
940 struct snd_device dev;
941
942 memset(&dev, 0, sizeof(dev));
943 dev.device_data = timer;
944 return snd_timer_dev_register(&dev);
945 }
946
947 /*
948 * System timer
949 */
950
951 struct snd_timer_system_private {
952 struct timer_list tlist;
953 unsigned long last_expires;
954 unsigned long last_jiffies;
955 unsigned long correction;
956 };
957
958 static void snd_timer_s_function(unsigned long data)
959 {
960 struct snd_timer *timer = (struct snd_timer *)data;
961 struct snd_timer_system_private *priv = timer->private_data;
962 unsigned long jiff = jiffies;
963 if (time_after(jiff, priv->last_expires))
964 priv->correction += (long)jiff - (long)priv->last_expires;
965 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
966 }
967
968 static int snd_timer_s_start(struct snd_timer * timer)
969 {
970 struct snd_timer_system_private *priv;
971 unsigned long njiff;
972
973 priv = (struct snd_timer_system_private *) timer->private_data;
974 njiff = (priv->last_jiffies = jiffies);
975 if (priv->correction > timer->sticks - 1) {
976 priv->correction -= timer->sticks - 1;
977 njiff++;
978 } else {
979 njiff += timer->sticks - priv->correction;
980 priv->correction = 0;
981 }
982 priv->last_expires = priv->tlist.expires = njiff;
983 add_timer(&priv->tlist);
984 return 0;
985 }
986
987 static int snd_timer_s_stop(struct snd_timer * timer)
988 {
989 struct snd_timer_system_private *priv;
990 unsigned long jiff;
991
992 priv = (struct snd_timer_system_private *) timer->private_data;
993 del_timer(&priv->tlist);
994 jiff = jiffies;
995 if (time_before(jiff, priv->last_expires))
996 timer->sticks = priv->last_expires - jiff;
997 else
998 timer->sticks = 1;
999 priv->correction = 0;
1000 return 0;
1001 }
1002
1003 static struct snd_timer_hardware snd_timer_system =
1004 {
1005 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1006 .resolution = 1000000000L / HZ,
1007 .ticks = 10000000L,
1008 .start = snd_timer_s_start,
1009 .stop = snd_timer_s_stop
1010 };
1011
1012 static void snd_timer_free_system(struct snd_timer *timer)
1013 {
1014 kfree(timer->private_data);
1015 }
1016
1017 static int snd_timer_register_system(void)
1018 {
1019 struct snd_timer *timer;
1020 struct snd_timer_system_private *priv;
1021 int err;
1022
1023 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1024 if (err < 0)
1025 return err;
1026 strcpy(timer->name, "system timer");
1027 timer->hw = snd_timer_system;
1028 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1029 if (priv == NULL) {
1030 snd_timer_free(timer);
1031 return -ENOMEM;
1032 }
1033 init_timer(&priv->tlist);
1034 priv->tlist.function = snd_timer_s_function;
1035 priv->tlist.data = (unsigned long) timer;
1036 timer->private_data = priv;
1037 timer->private_free = snd_timer_free_system;
1038 return snd_timer_global_register(timer);
1039 }
1040
1041 #ifdef CONFIG_PROC_FS
1042 /*
1043 * Info interface
1044 */
1045
1046 static void snd_timer_proc_read(struct snd_info_entry *entry,
1047 struct snd_info_buffer *buffer)
1048 {
1049 struct snd_timer *timer;
1050 struct snd_timer_instance *ti;
1051
1052 mutex_lock(&register_mutex);
1053 list_for_each_entry(timer, &snd_timer_list, device_list) {
1054 switch (timer->tmr_class) {
1055 case SNDRV_TIMER_CLASS_GLOBAL:
1056 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1057 break;
1058 case SNDRV_TIMER_CLASS_CARD:
1059 snd_iprintf(buffer, "C%i-%i: ",
1060 timer->card->number, timer->tmr_device);
1061 break;
1062 case SNDRV_TIMER_CLASS_PCM:
1063 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1064 timer->tmr_device, timer->tmr_subdevice);
1065 break;
1066 default:
1067 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1068 timer->card ? timer->card->number : -1,
1069 timer->tmr_device, timer->tmr_subdevice);
1070 }
1071 snd_iprintf(buffer, "%s :", timer->name);
1072 if (timer->hw.resolution)
1073 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1074 timer->hw.resolution / 1000,
1075 timer->hw.resolution % 1000,
1076 timer->hw.ticks);
1077 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1078 snd_iprintf(buffer, " SLAVE");
1079 snd_iprintf(buffer, "\n");
1080 list_for_each_entry(ti, &timer->open_list_head, open_list)
1081 snd_iprintf(buffer, " Client %s : %s\n",
1082 ti->owner ? ti->owner : "unknown",
1083 ti->flags & (SNDRV_TIMER_IFLG_START |
1084 SNDRV_TIMER_IFLG_RUNNING)
1085 ? "running" : "stopped");
1086 }
1087 mutex_unlock(&register_mutex);
1088 }
1089
1090 static struct snd_info_entry *snd_timer_proc_entry;
1091
1092 static void __init snd_timer_proc_init(void)
1093 {
1094 struct snd_info_entry *entry;
1095
1096 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1097 if (entry != NULL) {
1098 entry->c.text.read = snd_timer_proc_read;
1099 if (snd_info_register(entry) < 0) {
1100 snd_info_free_entry(entry);
1101 entry = NULL;
1102 }
1103 }
1104 snd_timer_proc_entry = entry;
1105 }
1106
1107 static void __exit snd_timer_proc_done(void)
1108 {
1109 snd_info_free_entry(snd_timer_proc_entry);
1110 }
1111 #else /* !CONFIG_PROC_FS */
1112 #define snd_timer_proc_init()
1113 #define snd_timer_proc_done()
1114 #endif
1115
1116 /*
1117 * USER SPACE interface
1118 */
1119
1120 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1121 unsigned long resolution,
1122 unsigned long ticks)
1123 {
1124 struct snd_timer_user *tu = timeri->callback_data;
1125 struct snd_timer_read *r;
1126 int prev;
1127
1128 spin_lock(&tu->qlock);
1129 if (tu->qused > 0) {
1130 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1131 r = &tu->queue[prev];
1132 if (r->resolution == resolution) {
1133 r->ticks += ticks;
1134 goto __wake;
1135 }
1136 }
1137 if (tu->qused >= tu->queue_size) {
1138 tu->overrun++;
1139 } else {
1140 r = &tu->queue[tu->qtail++];
1141 tu->qtail %= tu->queue_size;
1142 r->resolution = resolution;
1143 r->ticks = ticks;
1144 tu->qused++;
1145 }
1146 __wake:
1147 spin_unlock(&tu->qlock);
1148 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1149 wake_up(&tu->qchange_sleep);
1150 }
1151
1152 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1153 struct snd_timer_tread *tread)
1154 {
1155 if (tu->qused >= tu->queue_size) {
1156 tu->overrun++;
1157 } else {
1158 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1159 tu->qtail %= tu->queue_size;
1160 tu->qused++;
1161 }
1162 }
1163
1164 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1165 int event,
1166 struct timespec *tstamp,
1167 unsigned long resolution)
1168 {
1169 struct snd_timer_user *tu = timeri->callback_data;
1170 struct snd_timer_tread r1;
1171 unsigned long flags;
1172
1173 if (event >= SNDRV_TIMER_EVENT_START &&
1174 event <= SNDRV_TIMER_EVENT_PAUSE)
1175 tu->tstamp = *tstamp;
1176 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1177 return;
1178 r1.event = event;
1179 r1.tstamp = *tstamp;
1180 r1.val = resolution;
1181 spin_lock_irqsave(&tu->qlock, flags);
1182 snd_timer_user_append_to_tqueue(tu, &r1);
1183 spin_unlock_irqrestore(&tu->qlock, flags);
1184 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1185 wake_up(&tu->qchange_sleep);
1186 }
1187
1188 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1189 unsigned long resolution,
1190 unsigned long ticks)
1191 {
1192 struct snd_timer_user *tu = timeri->callback_data;
1193 struct snd_timer_tread *r, r1;
1194 struct timespec tstamp;
1195 int prev, append = 0;
1196
1197 memset(&tstamp, 0, sizeof(tstamp));
1198 spin_lock(&tu->qlock);
1199 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1200 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1201 spin_unlock(&tu->qlock);
1202 return;
1203 }
1204 if (tu->last_resolution != resolution || ticks > 0) {
1205 if (timer_tstamp_monotonic)
1206 do_posix_clock_monotonic_gettime(&tstamp);
1207 else
1208 getnstimeofday(&tstamp);
1209 }
1210 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1211 tu->last_resolution != resolution) {
1212 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1213 r1.tstamp = tstamp;
1214 r1.val = resolution;
1215 snd_timer_user_append_to_tqueue(tu, &r1);
1216 tu->last_resolution = resolution;
1217 append++;
1218 }
1219 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1220 goto __wake;
1221 if (ticks == 0)
1222 goto __wake;
1223 if (tu->qused > 0) {
1224 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1225 r = &tu->tqueue[prev];
1226 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1227 r->tstamp = tstamp;
1228 r->val += ticks;
1229 append++;
1230 goto __wake;
1231 }
1232 }
1233 r1.event = SNDRV_TIMER_EVENT_TICK;
1234 r1.tstamp = tstamp;
1235 r1.val = ticks;
1236 snd_timer_user_append_to_tqueue(tu, &r1);
1237 append++;
1238 __wake:
1239 spin_unlock(&tu->qlock);
1240 if (append == 0)
1241 return;
1242 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1243 wake_up(&tu->qchange_sleep);
1244 }
1245
1246 static int snd_timer_user_open(struct inode *inode, struct file *file)
1247 {
1248 struct snd_timer_user *tu;
1249 int err;
1250
1251 err = nonseekable_open(inode, file);
1252 if (err < 0)
1253 return err;
1254
1255 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1256 if (tu == NULL)
1257 return -ENOMEM;
1258 spin_lock_init(&tu->qlock);
1259 init_waitqueue_head(&tu->qchange_sleep);
1260 mutex_init(&tu->tread_sem);
1261 tu->ticks = 1;
1262 tu->queue_size = 128;
1263 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1264 GFP_KERNEL);
1265 if (tu->queue == NULL) {
1266 kfree(tu);
1267 return -ENOMEM;
1268 }
1269 file->private_data = tu;
1270 return 0;
1271 }
1272
1273 static int snd_timer_user_release(struct inode *inode, struct file *file)
1274 {
1275 struct snd_timer_user *tu;
1276
1277 if (file->private_data) {
1278 tu = file->private_data;
1279 file->private_data = NULL;
1280 if (tu->timeri)
1281 snd_timer_close(tu->timeri);
1282 kfree(tu->queue);
1283 kfree(tu->tqueue);
1284 kfree(tu);
1285 }
1286 return 0;
1287 }
1288
1289 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1290 {
1291 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1292 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1293 id->card = -1;
1294 id->device = -1;
1295 id->subdevice = -1;
1296 }
1297
1298 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1299 {
1300 id->dev_class = timer->tmr_class;
1301 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1302 id->card = timer->card ? timer->card->number : -1;
1303 id->device = timer->tmr_device;
1304 id->subdevice = timer->tmr_subdevice;
1305 }
1306
1307 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1308 {
1309 struct snd_timer_id id;
1310 struct snd_timer *timer;
1311 struct list_head *p;
1312
1313 if (copy_from_user(&id, _tid, sizeof(id)))
1314 return -EFAULT;
1315 mutex_lock(&register_mutex);
1316 if (id.dev_class < 0) { /* first item */
1317 if (list_empty(&snd_timer_list))
1318 snd_timer_user_zero_id(&id);
1319 else {
1320 timer = list_entry(snd_timer_list.next,
1321 struct snd_timer, device_list);
1322 snd_timer_user_copy_id(&id, timer);
1323 }
1324 } else {
1325 switch (id.dev_class) {
1326 case SNDRV_TIMER_CLASS_GLOBAL:
1327 id.device = id.device < 0 ? 0 : id.device + 1;
1328 list_for_each(p, &snd_timer_list) {
1329 timer = list_entry(p, struct snd_timer, device_list);
1330 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1331 snd_timer_user_copy_id(&id, timer);
1332 break;
1333 }
1334 if (timer->tmr_device >= id.device) {
1335 snd_timer_user_copy_id(&id, timer);
1336 break;
1337 }
1338 }
1339 if (p == &snd_timer_list)
1340 snd_timer_user_zero_id(&id);
1341 break;
1342 case SNDRV_TIMER_CLASS_CARD:
1343 case SNDRV_TIMER_CLASS_PCM:
1344 if (id.card < 0) {
1345 id.card = 0;
1346 } else {
1347 if (id.card < 0) {
1348 id.card = 0;
1349 } else {
1350 if (id.device < 0) {
1351 id.device = 0;
1352 } else {
1353 if (id.subdevice < 0) {
1354 id.subdevice = 0;
1355 } else {
1356 id.subdevice++;
1357 }
1358 }
1359 }
1360 }
1361 list_for_each(p, &snd_timer_list) {
1362 timer = list_entry(p, struct snd_timer, device_list);
1363 if (timer->tmr_class > id.dev_class) {
1364 snd_timer_user_copy_id(&id, timer);
1365 break;
1366 }
1367 if (timer->tmr_class < id.dev_class)
1368 continue;
1369 if (timer->card->number > id.card) {
1370 snd_timer_user_copy_id(&id, timer);
1371 break;
1372 }
1373 if (timer->card->number < id.card)
1374 continue;
1375 if (timer->tmr_device > id.device) {
1376 snd_timer_user_copy_id(&id, timer);
1377 break;
1378 }
1379 if (timer->tmr_device < id.device)
1380 continue;
1381 if (timer->tmr_subdevice > id.subdevice) {
1382 snd_timer_user_copy_id(&id, timer);
1383 break;
1384 }
1385 if (timer->tmr_subdevice < id.subdevice)
1386 continue;
1387 snd_timer_user_copy_id(&id, timer);
1388 break;
1389 }
1390 if (p == &snd_timer_list)
1391 snd_timer_user_zero_id(&id);
1392 break;
1393 default:
1394 snd_timer_user_zero_id(&id);
1395 }
1396 }
1397 mutex_unlock(&register_mutex);
1398 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1399 return -EFAULT;
1400 return 0;
1401 }
1402
1403 static int snd_timer_user_ginfo(struct file *file,
1404 struct snd_timer_ginfo __user *_ginfo)
1405 {
1406 struct snd_timer_ginfo *ginfo;
1407 struct snd_timer_id tid;
1408 struct snd_timer *t;
1409 struct list_head *p;
1410 int err = 0;
1411
1412 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1413 if (IS_ERR(ginfo))
1414 return PTR_ERR(ginfo);
1415
1416 tid = ginfo->tid;
1417 memset(ginfo, 0, sizeof(*ginfo));
1418 ginfo->tid = tid;
1419 mutex_lock(&register_mutex);
1420 t = snd_timer_find(&tid);
1421 if (t != NULL) {
1422 ginfo->card = t->card ? t->card->number : -1;
1423 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1424 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1425 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1426 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1427 ginfo->resolution = t->hw.resolution;
1428 if (t->hw.resolution_min > 0) {
1429 ginfo->resolution_min = t->hw.resolution_min;
1430 ginfo->resolution_max = t->hw.resolution_max;
1431 }
1432 list_for_each(p, &t->open_list_head) {
1433 ginfo->clients++;
1434 }
1435 } else {
1436 err = -ENODEV;
1437 }
1438 mutex_unlock(&register_mutex);
1439 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1440 err = -EFAULT;
1441 kfree(ginfo);
1442 return err;
1443 }
1444
1445 static int snd_timer_user_gparams(struct file *file,
1446 struct snd_timer_gparams __user *_gparams)
1447 {
1448 struct snd_timer_gparams gparams;
1449 struct snd_timer *t;
1450 int err;
1451
1452 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1453 return -EFAULT;
1454 mutex_lock(&register_mutex);
1455 t = snd_timer_find(&gparams.tid);
1456 if (!t) {
1457 err = -ENODEV;
1458 goto _error;
1459 }
1460 if (!list_empty(&t->open_list_head)) {
1461 err = -EBUSY;
1462 goto _error;
1463 }
1464 if (!t->hw.set_period) {
1465 err = -ENOSYS;
1466 goto _error;
1467 }
1468 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1469 _error:
1470 mutex_unlock(&register_mutex);
1471 return err;
1472 }
1473
1474 static int snd_timer_user_gstatus(struct file *file,
1475 struct snd_timer_gstatus __user *_gstatus)
1476 {
1477 struct snd_timer_gstatus gstatus;
1478 struct snd_timer_id tid;
1479 struct snd_timer *t;
1480 int err = 0;
1481
1482 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1483 return -EFAULT;
1484 tid = gstatus.tid;
1485 memset(&gstatus, 0, sizeof(gstatus));
1486 gstatus.tid = tid;
1487 mutex_lock(&register_mutex);
1488 t = snd_timer_find(&tid);
1489 if (t != NULL) {
1490 if (t->hw.c_resolution)
1491 gstatus.resolution = t->hw.c_resolution(t);
1492 else
1493 gstatus.resolution = t->hw.resolution;
1494 if (t->hw.precise_resolution) {
1495 t->hw.precise_resolution(t, &gstatus.resolution_num,
1496 &gstatus.resolution_den);
1497 } else {
1498 gstatus.resolution_num = gstatus.resolution;
1499 gstatus.resolution_den = 1000000000uL;
1500 }
1501 } else {
1502 err = -ENODEV;
1503 }
1504 mutex_unlock(&register_mutex);
1505 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1506 err = -EFAULT;
1507 return err;
1508 }
1509
1510 static int snd_timer_user_tselect(struct file *file,
1511 struct snd_timer_select __user *_tselect)
1512 {
1513 struct snd_timer_user *tu;
1514 struct snd_timer_select tselect;
1515 char str[32];
1516 int err = 0;
1517
1518 tu = file->private_data;
1519 mutex_lock(&tu->tread_sem);
1520 if (tu->timeri) {
1521 snd_timer_close(tu->timeri);
1522 tu->timeri = NULL;
1523 }
1524 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1525 err = -EFAULT;
1526 goto __err;
1527 }
1528 sprintf(str, "application %i", current->pid);
1529 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1530 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1531 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1532 if (err < 0)
1533 goto __err;
1534
1535 kfree(tu->queue);
1536 tu->queue = NULL;
1537 kfree(tu->tqueue);
1538 tu->tqueue = NULL;
1539 if (tu->tread) {
1540 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1541 GFP_KERNEL);
1542 if (tu->tqueue == NULL)
1543 err = -ENOMEM;
1544 } else {
1545 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1546 GFP_KERNEL);
1547 if (tu->queue == NULL)
1548 err = -ENOMEM;
1549 }
1550
1551 if (err < 0) {
1552 snd_timer_close(tu->timeri);
1553 tu->timeri = NULL;
1554 } else {
1555 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1556 tu->timeri->callback = tu->tread
1557 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1558 tu->timeri->ccallback = snd_timer_user_ccallback;
1559 tu->timeri->callback_data = (void *)tu;
1560 }
1561
1562 __err:
1563 mutex_unlock(&tu->tread_sem);
1564 return err;
1565 }
1566
1567 static int snd_timer_user_info(struct file *file,
1568 struct snd_timer_info __user *_info)
1569 {
1570 struct snd_timer_user *tu;
1571 struct snd_timer_info *info;
1572 struct snd_timer *t;
1573 int err = 0;
1574
1575 tu = file->private_data;
1576 if (!tu->timeri)
1577 return -EBADFD;
1578 t = tu->timeri->timer;
1579 if (!t)
1580 return -EBADFD;
1581
1582 info = kzalloc(sizeof(*info), GFP_KERNEL);
1583 if (! info)
1584 return -ENOMEM;
1585 info->card = t->card ? t->card->number : -1;
1586 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1587 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1588 strlcpy(info->id, t->id, sizeof(info->id));
1589 strlcpy(info->name, t->name, sizeof(info->name));
1590 info->resolution = t->hw.resolution;
1591 if (copy_to_user(_info, info, sizeof(*_info)))
1592 err = -EFAULT;
1593 kfree(info);
1594 return err;
1595 }
1596
1597 static int snd_timer_user_params(struct file *file,
1598 struct snd_timer_params __user *_params)
1599 {
1600 struct snd_timer_user *tu;
1601 struct snd_timer_params params;
1602 struct snd_timer *t;
1603 struct snd_timer_read *tr;
1604 struct snd_timer_tread *ttr;
1605 int err;
1606
1607 tu = file->private_data;
1608 if (!tu->timeri)
1609 return -EBADFD;
1610 t = tu->timeri->timer;
1611 if (!t)
1612 return -EBADFD;
1613 if (copy_from_user(&params, _params, sizeof(params)))
1614 return -EFAULT;
1615 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1616 err = -EINVAL;
1617 goto _end;
1618 }
1619 if (params.queue_size > 0 &&
1620 (params.queue_size < 32 || params.queue_size > 1024)) {
1621 err = -EINVAL;
1622 goto _end;
1623 }
1624 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1625 (1<<SNDRV_TIMER_EVENT_TICK)|
1626 (1<<SNDRV_TIMER_EVENT_START)|
1627 (1<<SNDRV_TIMER_EVENT_STOP)|
1628 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1629 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1630 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1631 (1<<SNDRV_TIMER_EVENT_RESUME)|
1632 (1<<SNDRV_TIMER_EVENT_MSTART)|
1633 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1634 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1635 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1636 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1637 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1638 err = -EINVAL;
1639 goto _end;
1640 }
1641 snd_timer_stop(tu->timeri);
1642 spin_lock_irq(&t->lock);
1643 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1644 SNDRV_TIMER_IFLG_EXCLUSIVE|
1645 SNDRV_TIMER_IFLG_EARLY_EVENT);
1646 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1647 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1648 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1649 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1650 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1651 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1652 spin_unlock_irq(&t->lock);
1653 if (params.queue_size > 0 &&
1654 (unsigned int)tu->queue_size != params.queue_size) {
1655 if (tu->tread) {
1656 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1657 GFP_KERNEL);
1658 if (ttr) {
1659 kfree(tu->tqueue);
1660 tu->queue_size = params.queue_size;
1661 tu->tqueue = ttr;
1662 }
1663 } else {
1664 tr = kmalloc(params.queue_size * sizeof(*tr),
1665 GFP_KERNEL);
1666 if (tr) {
1667 kfree(tu->queue);
1668 tu->queue_size = params.queue_size;
1669 tu->queue = tr;
1670 }
1671 }
1672 }
1673 tu->qhead = tu->qtail = tu->qused = 0;
1674 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1675 if (tu->tread) {
1676 struct snd_timer_tread tread;
1677 tread.event = SNDRV_TIMER_EVENT_EARLY;
1678 tread.tstamp.tv_sec = 0;
1679 tread.tstamp.tv_nsec = 0;
1680 tread.val = 0;
1681 snd_timer_user_append_to_tqueue(tu, &tread);
1682 } else {
1683 struct snd_timer_read *r = &tu->queue[0];
1684 r->resolution = 0;
1685 r->ticks = 0;
1686 tu->qused++;
1687 tu->qtail++;
1688 }
1689 }
1690 tu->filter = params.filter;
1691 tu->ticks = params.ticks;
1692 err = 0;
1693 _end:
1694 if (copy_to_user(_params, &params, sizeof(params)))
1695 return -EFAULT;
1696 return err;
1697 }
1698
1699 static int snd_timer_user_status(struct file *file,
1700 struct snd_timer_status __user *_status)
1701 {
1702 struct snd_timer_user *tu;
1703 struct snd_timer_status status;
1704
1705 tu = file->private_data;
1706 if (!tu->timeri)
1707 return -EBADFD;
1708 memset(&status, 0, sizeof(status));
1709 status.tstamp = tu->tstamp;
1710 status.resolution = snd_timer_resolution(tu->timeri);
1711 status.lost = tu->timeri->lost;
1712 status.overrun = tu->overrun;
1713 spin_lock_irq(&tu->qlock);
1714 status.queue = tu->qused;
1715 spin_unlock_irq(&tu->qlock);
1716 if (copy_to_user(_status, &status, sizeof(status)))
1717 return -EFAULT;
1718 return 0;
1719 }
1720
1721 static int snd_timer_user_start(struct file *file)
1722 {
1723 int err;
1724 struct snd_timer_user *tu;
1725
1726 tu = file->private_data;
1727 if (!tu->timeri)
1728 return -EBADFD;
1729 snd_timer_stop(tu->timeri);
1730 tu->timeri->lost = 0;
1731 tu->last_resolution = 0;
1732 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1733 }
1734
1735 static int snd_timer_user_stop(struct file *file)
1736 {
1737 int err;
1738 struct snd_timer_user *tu;
1739
1740 tu = file->private_data;
1741 if (!tu->timeri)
1742 return -EBADFD;
1743 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1744 }
1745
1746 static int snd_timer_user_continue(struct file *file)
1747 {
1748 int err;
1749 struct snd_timer_user *tu;
1750
1751 tu = file->private_data;
1752 if (!tu->timeri)
1753 return -EBADFD;
1754 tu->timeri->lost = 0;
1755 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1756 }
1757
1758 static int snd_timer_user_pause(struct file *file)
1759 {
1760 int err;
1761 struct snd_timer_user *tu;
1762
1763 tu = file->private_data;
1764 if (!tu->timeri)
1765 return -EBADFD;
1766 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1767 }
1768
1769 enum {
1770 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1771 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1772 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1773 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1774 };
1775
1776 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1777 unsigned long arg)
1778 {
1779 struct snd_timer_user *tu;
1780 void __user *argp = (void __user *)arg;
1781 int __user *p = argp;
1782
1783 tu = file->private_data;
1784 switch (cmd) {
1785 case SNDRV_TIMER_IOCTL_PVERSION:
1786 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1787 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1788 return snd_timer_user_next_device(argp);
1789 case SNDRV_TIMER_IOCTL_TREAD:
1790 {
1791 int xarg;
1792
1793 mutex_lock(&tu->tread_sem);
1794 if (tu->timeri) { /* too late */
1795 mutex_unlock(&tu->tread_sem);
1796 return -EBUSY;
1797 }
1798 if (get_user(xarg, p)) {
1799 mutex_unlock(&tu->tread_sem);
1800 return -EFAULT;
1801 }
1802 tu->tread = xarg ? 1 : 0;
1803 mutex_unlock(&tu->tread_sem);
1804 return 0;
1805 }
1806 case SNDRV_TIMER_IOCTL_GINFO:
1807 return snd_timer_user_ginfo(file, argp);
1808 case SNDRV_TIMER_IOCTL_GPARAMS:
1809 return snd_timer_user_gparams(file, argp);
1810 case SNDRV_TIMER_IOCTL_GSTATUS:
1811 return snd_timer_user_gstatus(file, argp);
1812 case SNDRV_TIMER_IOCTL_SELECT:
1813 return snd_timer_user_tselect(file, argp);
1814 case SNDRV_TIMER_IOCTL_INFO:
1815 return snd_timer_user_info(file, argp);
1816 case SNDRV_TIMER_IOCTL_PARAMS:
1817 return snd_timer_user_params(file, argp);
1818 case SNDRV_TIMER_IOCTL_STATUS:
1819 return snd_timer_user_status(file, argp);
1820 case SNDRV_TIMER_IOCTL_START:
1821 case SNDRV_TIMER_IOCTL_START_OLD:
1822 return snd_timer_user_start(file);
1823 case SNDRV_TIMER_IOCTL_STOP:
1824 case SNDRV_TIMER_IOCTL_STOP_OLD:
1825 return snd_timer_user_stop(file);
1826 case SNDRV_TIMER_IOCTL_CONTINUE:
1827 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1828 return snd_timer_user_continue(file);
1829 case SNDRV_TIMER_IOCTL_PAUSE:
1830 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1831 return snd_timer_user_pause(file);
1832 }
1833 return -ENOTTY;
1834 }
1835
1836 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1837 {
1838 struct snd_timer_user *tu;
1839
1840 tu = file->private_data;
1841 return fasync_helper(fd, file, on, &tu->fasync);
1842 }
1843
1844 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1845 size_t count, loff_t *offset)
1846 {
1847 struct snd_timer_user *tu;
1848 long result = 0, unit;
1849 int err = 0;
1850
1851 tu = file->private_data;
1852 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1853 spin_lock_irq(&tu->qlock);
1854 while ((long)count - result >= unit) {
1855 while (!tu->qused) {
1856 wait_queue_t wait;
1857
1858 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1859 err = -EAGAIN;
1860 break;
1861 }
1862
1863 set_current_state(TASK_INTERRUPTIBLE);
1864 init_waitqueue_entry(&wait, current);
1865 add_wait_queue(&tu->qchange_sleep, &wait);
1866
1867 spin_unlock_irq(&tu->qlock);
1868 schedule();
1869 spin_lock_irq(&tu->qlock);
1870
1871 remove_wait_queue(&tu->qchange_sleep, &wait);
1872
1873 if (signal_pending(current)) {
1874 err = -ERESTARTSYS;
1875 break;
1876 }
1877 }
1878
1879 spin_unlock_irq(&tu->qlock);
1880 if (err < 0)
1881 goto _error;
1882
1883 if (tu->tread) {
1884 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1885 sizeof(struct snd_timer_tread))) {
1886 err = -EFAULT;
1887 goto _error;
1888 }
1889 } else {
1890 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1891 sizeof(struct snd_timer_read))) {
1892 err = -EFAULT;
1893 goto _error;
1894 }
1895 }
1896
1897 tu->qhead %= tu->queue_size;
1898
1899 result += unit;
1900 buffer += unit;
1901
1902 spin_lock_irq(&tu->qlock);
1903 tu->qused--;
1904 }
1905 spin_unlock_irq(&tu->qlock);
1906 _error:
1907 return result > 0 ? result : err;
1908 }
1909
1910 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1911 {
1912 unsigned int mask;
1913 struct snd_timer_user *tu;
1914
1915 tu = file->private_data;
1916
1917 poll_wait(file, &tu->qchange_sleep, wait);
1918
1919 mask = 0;
1920 if (tu->qused)
1921 mask |= POLLIN | POLLRDNORM;
1922
1923 return mask;
1924 }
1925
1926 #ifdef CONFIG_COMPAT
1927 #include "timer_compat.c"
1928 #else
1929 #define snd_timer_user_ioctl_compat NULL
1930 #endif
1931
1932 static const struct file_operations snd_timer_f_ops =
1933 {
1934 .owner = THIS_MODULE,
1935 .read = snd_timer_user_read,
1936 .open = snd_timer_user_open,
1937 .release = snd_timer_user_release,
1938 .llseek = no_llseek,
1939 .poll = snd_timer_user_poll,
1940 .unlocked_ioctl = snd_timer_user_ioctl,
1941 .compat_ioctl = snd_timer_user_ioctl_compat,
1942 .fasync = snd_timer_user_fasync,
1943 };
1944
1945 /*
1946 * ENTRY functions
1947 */
1948
1949 static int __init alsa_timer_init(void)
1950 {
1951 int err;
1952
1953 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1954 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1955 "system timer");
1956 #endif
1957
1958 if ((err = snd_timer_register_system()) < 0)
1959 pr_err("ALSA: unable to register system timer (%i)\n", err);
1960 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1961 &snd_timer_f_ops, NULL, "timer")) < 0)
1962 pr_err("ALSA: unable to register timer device (%i)\n", 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 kernel - Deliverables
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