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Merge tag 'v3.10.89' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.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 defined(CONFIG_SND_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE)
39 #define DEFAULT_TIMER_LIMIT 4
40 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
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 ioctl_lock;
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 snd_printd("invalid slave class %i\n", tid->dev_sclass);
244 return -EINVAL;
245 }
246 mutex_lock(&register_mutex);
247 timeri = snd_timer_instance_new(owner, NULL);
248 if (!timeri) {
249 mutex_unlock(&register_mutex);
250 return -ENOMEM;
251 }
252 timeri->slave_class = tid->dev_sclass;
253 timeri->slave_id = tid->device;
254 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
255 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
256 snd_timer_check_slave(timeri);
257 mutex_unlock(&register_mutex);
258 *ti = timeri;
259 return 0;
260 }
261
262 /* open a master instance */
263 mutex_lock(&register_mutex);
264 timer = snd_timer_find(tid);
265 #ifdef CONFIG_MODULES
266 if (!timer) {
267 mutex_unlock(&register_mutex);
268 snd_timer_request(tid);
269 mutex_lock(&register_mutex);
270 timer = snd_timer_find(tid);
271 }
272 #endif
273 if (!timer) {
274 mutex_unlock(&register_mutex);
275 return -ENODEV;
276 }
277 if (!list_empty(&timer->open_list_head)) {
278 timeri = list_entry(timer->open_list_head.next,
279 struct snd_timer_instance, open_list);
280 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
281 mutex_unlock(&register_mutex);
282 return -EBUSY;
283 }
284 }
285 timeri = snd_timer_instance_new(owner, timer);
286 if (!timeri) {
287 mutex_unlock(&register_mutex);
288 return -ENOMEM;
289 }
290 timeri->slave_class = tid->dev_sclass;
291 timeri->slave_id = slave_id;
292 if (list_empty(&timer->open_list_head) && timer->hw.open)
293 timer->hw.open(timer);
294 list_add_tail(&timeri->open_list, &timer->open_list_head);
295 snd_timer_check_master(timeri);
296 mutex_unlock(&register_mutex);
297 *ti = timeri;
298 return 0;
299 }
300
301 static int _snd_timer_stop(struct snd_timer_instance *timeri,
302 int keep_flag, int event);
303
304 /*
305 * close a timer instance
306 */
307 int snd_timer_close(struct snd_timer_instance *timeri)
308 {
309 struct snd_timer *timer = NULL;
310 struct snd_timer_instance *slave, *tmp;
311
312 if (snd_BUG_ON(!timeri))
313 return -ENXIO;
314
315 /* force to stop the timer */
316 snd_timer_stop(timeri);
317
318 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
319 /* wait, until the active callback is finished */
320 spin_lock_irq(&slave_active_lock);
321 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
322 spin_unlock_irq(&slave_active_lock);
323 udelay(10);
324 spin_lock_irq(&slave_active_lock);
325 }
326 spin_unlock_irq(&slave_active_lock);
327 mutex_lock(&register_mutex);
328 list_del(&timeri->open_list);
329 mutex_unlock(&register_mutex);
330 } else {
331 timer = timeri->timer;
332 if (snd_BUG_ON(!timer))
333 goto out;
334 /* wait, until the active callback is finished */
335 spin_lock_irq(&timer->lock);
336 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
337 spin_unlock_irq(&timer->lock);
338 udelay(10);
339 spin_lock_irq(&timer->lock);
340 }
341 spin_unlock_irq(&timer->lock);
342 mutex_lock(&register_mutex);
343 list_del(&timeri->open_list);
344 if (timer && list_empty(&timer->open_list_head) &&
345 timer->hw.close)
346 timer->hw.close(timer);
347 /* remove slave links */
348 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
349 open_list) {
350 spin_lock_irq(&slave_active_lock);
351 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
352 list_move_tail(&slave->open_list, &snd_timer_slave_list);
353 slave->master = NULL;
354 slave->timer = NULL;
355 spin_unlock_irq(&slave_active_lock);
356 }
357 mutex_unlock(&register_mutex);
358 }
359 out:
360 if (timeri->private_free)
361 timeri->private_free(timeri);
362 kfree(timeri->owner);
363 kfree(timeri);
364 if (timer)
365 module_put(timer->module);
366 return 0;
367 }
368
369 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
370 {
371 struct snd_timer * timer;
372
373 if (timeri == NULL)
374 return 0;
375 if ((timer = timeri->timer) != NULL) {
376 if (timer->hw.c_resolution)
377 return timer->hw.c_resolution(timer);
378 return timer->hw.resolution;
379 }
380 return 0;
381 }
382
383 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
384 {
385 struct snd_timer *timer;
386 unsigned long flags;
387 unsigned long resolution = 0;
388 struct snd_timer_instance *ts;
389 struct timespec tstamp;
390
391 if (timer_tstamp_monotonic)
392 do_posix_clock_monotonic_gettime(&tstamp);
393 else
394 getnstimeofday(&tstamp);
395 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
396 event > SNDRV_TIMER_EVENT_PAUSE))
397 return;
398 if (event == SNDRV_TIMER_EVENT_START ||
399 event == SNDRV_TIMER_EVENT_CONTINUE)
400 resolution = snd_timer_resolution(ti);
401 if (ti->ccallback)
402 ti->ccallback(ti, event, &tstamp, resolution);
403 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
404 return;
405 timer = ti->timer;
406 if (timer == NULL)
407 return;
408 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
409 return;
410 spin_lock_irqsave(&timer->lock, flags);
411 list_for_each_entry(ts, &ti->slave_active_head, active_list)
412 if (ts->ccallback)
413 ts->ccallback(ti, event + 100, &tstamp, resolution);
414 spin_unlock_irqrestore(&timer->lock, flags);
415 }
416
417 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
418 unsigned long sticks)
419 {
420 list_move_tail(&timeri->active_list, &timer->active_list_head);
421 if (timer->running) {
422 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
423 goto __start_now;
424 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
425 timeri->flags |= SNDRV_TIMER_IFLG_START;
426 return 1; /* delayed start */
427 } else {
428 timer->sticks = sticks;
429 timer->hw.start(timer);
430 __start_now:
431 timer->running++;
432 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
433 return 0;
434 }
435 }
436
437 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
438 {
439 unsigned long flags;
440
441 spin_lock_irqsave(&slave_active_lock, flags);
442 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
443 if (timeri->master)
444 list_add_tail(&timeri->active_list,
445 &timeri->master->slave_active_head);
446 spin_unlock_irqrestore(&slave_active_lock, flags);
447 return 1; /* delayed start */
448 }
449
450 /*
451 * start the timer instance
452 */
453 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
454 {
455 struct snd_timer *timer;
456 int result = -EINVAL;
457 unsigned long flags;
458
459 if (timeri == NULL || ticks < 1)
460 return -EINVAL;
461 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
462 result = snd_timer_start_slave(timeri);
463 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
464 return result;
465 }
466 timer = timeri->timer;
467 if (timer == NULL)
468 return -EINVAL;
469 spin_lock_irqsave(&timer->lock, flags);
470 timeri->ticks = timeri->cticks = ticks;
471 timeri->pticks = 0;
472 result = snd_timer_start1(timer, timeri, ticks);
473 spin_unlock_irqrestore(&timer->lock, flags);
474 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
475 return result;
476 }
477
478 static int _snd_timer_stop(struct snd_timer_instance * timeri,
479 int keep_flag, int event)
480 {
481 struct snd_timer *timer;
482 unsigned long flags;
483
484 if (snd_BUG_ON(!timeri))
485 return -ENXIO;
486
487 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
488 if (!keep_flag) {
489 spin_lock_irqsave(&slave_active_lock, flags);
490 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
491 spin_unlock_irqrestore(&slave_active_lock, flags);
492 }
493 goto __end;
494 }
495 timer = timeri->timer;
496 if (!timer)
497 return -EINVAL;
498 spin_lock_irqsave(&timer->lock, flags);
499 list_del_init(&timeri->ack_list);
500 list_del_init(&timeri->active_list);
501 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
502 !(--timer->running)) {
503 timer->hw.stop(timer);
504 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
505 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
506 snd_timer_reschedule(timer, 0);
507 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
508 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
509 timer->hw.start(timer);
510 }
511 }
512 }
513 if (!keep_flag)
514 timeri->flags &=
515 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
516 spin_unlock_irqrestore(&timer->lock, flags);
517 __end:
518 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
519 snd_timer_notify1(timeri, event);
520 return 0;
521 }
522
523 /*
524 * stop the timer instance.
525 *
526 * do not call this from the timer callback!
527 */
528 int snd_timer_stop(struct snd_timer_instance *timeri)
529 {
530 struct snd_timer *timer;
531 unsigned long flags;
532 int err;
533
534 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
535 if (err < 0)
536 return err;
537 timer = timeri->timer;
538 if (!timer)
539 return -EINVAL;
540 spin_lock_irqsave(&timer->lock, flags);
541 timeri->cticks = timeri->ticks;
542 timeri->pticks = 0;
543 spin_unlock_irqrestore(&timer->lock, flags);
544 return 0;
545 }
546
547 /*
548 * start again.. the tick is kept.
549 */
550 int snd_timer_continue(struct snd_timer_instance *timeri)
551 {
552 struct snd_timer *timer;
553 int result = -EINVAL;
554 unsigned long flags;
555
556 if (timeri == NULL)
557 return result;
558 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
559 return snd_timer_start_slave(timeri);
560 timer = timeri->timer;
561 if (! timer)
562 return -EINVAL;
563 spin_lock_irqsave(&timer->lock, flags);
564 if (!timeri->cticks)
565 timeri->cticks = 1;
566 timeri->pticks = 0;
567 result = snd_timer_start1(timer, timeri, timer->sticks);
568 spin_unlock_irqrestore(&timer->lock, flags);
569 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
570 return result;
571 }
572
573 /*
574 * pause.. remember the ticks left
575 */
576 int snd_timer_pause(struct snd_timer_instance * timeri)
577 {
578 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
579 }
580
581 /*
582 * reschedule the timer
583 *
584 * start pending instances and check the scheduling ticks.
585 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
586 */
587 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
588 {
589 struct snd_timer_instance *ti;
590 unsigned long ticks = ~0UL;
591
592 list_for_each_entry(ti, &timer->active_list_head, active_list) {
593 if (ti->flags & SNDRV_TIMER_IFLG_START) {
594 ti->flags &= ~SNDRV_TIMER_IFLG_START;
595 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
596 timer->running++;
597 }
598 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
599 if (ticks > ti->cticks)
600 ticks = ti->cticks;
601 }
602 }
603 if (ticks == ~0UL) {
604 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
605 return;
606 }
607 if (ticks > timer->hw.ticks)
608 ticks = timer->hw.ticks;
609 if (ticks_left != ticks)
610 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
611 timer->sticks = ticks;
612 }
613
614 /*
615 * timer tasklet
616 *
617 */
618 static void snd_timer_tasklet(unsigned long arg)
619 {
620 struct snd_timer *timer = (struct snd_timer *) arg;
621 struct snd_timer_instance *ti;
622 struct list_head *p;
623 unsigned long resolution, ticks;
624 unsigned long flags;
625
626 spin_lock_irqsave(&timer->lock, flags);
627 /* now process all callbacks */
628 while (!list_empty(&timer->sack_list_head)) {
629 p = timer->sack_list_head.next; /* get first item */
630 ti = list_entry(p, struct snd_timer_instance, ack_list);
631
632 /* remove from ack_list and make empty */
633 list_del_init(p);
634
635 ticks = ti->pticks;
636 ti->pticks = 0;
637 resolution = ti->resolution;
638
639 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
640 spin_unlock(&timer->lock);
641 if (ti->callback)
642 ti->callback(ti, resolution, ticks);
643 spin_lock(&timer->lock);
644 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
645 }
646 spin_unlock_irqrestore(&timer->lock, flags);
647 }
648
649 /*
650 * timer interrupt
651 *
652 * ticks_left is usually equal to timer->sticks.
653 *
654 */
655 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
656 {
657 struct snd_timer_instance *ti, *ts, *tmp;
658 unsigned long resolution, ticks;
659 struct list_head *p, *ack_list_head;
660 unsigned long flags;
661 int use_tasklet = 0;
662
663 if (timer == NULL)
664 return;
665
666 spin_lock_irqsave(&timer->lock, flags);
667
668 /* remember the current resolution */
669 if (timer->hw.c_resolution)
670 resolution = timer->hw.c_resolution(timer);
671 else
672 resolution = timer->hw.resolution;
673
674 /* loop for all active instances
675 * Here we cannot use list_for_each_entry because the active_list of a
676 * processed instance is relinked to done_list_head before the callback
677 * is called.
678 */
679 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
680 active_list) {
681 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
682 continue;
683 ti->pticks += ticks_left;
684 ti->resolution = resolution;
685 if (ti->cticks < ticks_left)
686 ti->cticks = 0;
687 else
688 ti->cticks -= ticks_left;
689 if (ti->cticks) /* not expired */
690 continue;
691 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
692 ti->cticks = ti->ticks;
693 } else {
694 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
695 if (--timer->running)
696 list_del(&ti->active_list);
697 }
698 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
699 (ti->flags & SNDRV_TIMER_IFLG_FAST))
700 ack_list_head = &timer->ack_list_head;
701 else
702 ack_list_head = &timer->sack_list_head;
703 if (list_empty(&ti->ack_list))
704 list_add_tail(&ti->ack_list, ack_list_head);
705 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
706 ts->pticks = ti->pticks;
707 ts->resolution = resolution;
708 if (list_empty(&ts->ack_list))
709 list_add_tail(&ts->ack_list, ack_list_head);
710 }
711 }
712 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
713 snd_timer_reschedule(timer, timer->sticks);
714 if (timer->running) {
715 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
716 timer->hw.stop(timer);
717 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
718 }
719 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
720 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
721 /* restart timer */
722 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
723 timer->hw.start(timer);
724 }
725 } else {
726 timer->hw.stop(timer);
727 }
728
729 /* now process all fast callbacks */
730 while (!list_empty(&timer->ack_list_head)) {
731 p = timer->ack_list_head.next; /* get first item */
732 ti = list_entry(p, struct snd_timer_instance, ack_list);
733
734 /* remove from ack_list and make empty */
735 list_del_init(p);
736
737 ticks = ti->pticks;
738 ti->pticks = 0;
739
740 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
741 spin_unlock(&timer->lock);
742 if (ti->callback)
743 ti->callback(ti, resolution, ticks);
744 spin_lock(&timer->lock);
745 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
746 }
747
748 /* do we have any slow callbacks? */
749 use_tasklet = !list_empty(&timer->sack_list_head);
750 spin_unlock_irqrestore(&timer->lock, flags);
751
752 if (use_tasklet)
753 tasklet_schedule(&timer->task_queue);
754 }
755
756 /*
757
758 */
759
760 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
761 struct snd_timer **rtimer)
762 {
763 struct snd_timer *timer;
764 int err;
765 static struct snd_device_ops ops = {
766 .dev_free = snd_timer_dev_free,
767 .dev_register = snd_timer_dev_register,
768 .dev_disconnect = snd_timer_dev_disconnect,
769 };
770
771 if (snd_BUG_ON(!tid))
772 return -EINVAL;
773 if (rtimer)
774 *rtimer = NULL;
775 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
776 if (timer == NULL) {
777 snd_printk(KERN_ERR "timer: cannot allocate\n");
778 return -ENOMEM;
779 }
780 timer->tmr_class = tid->dev_class;
781 timer->card = card;
782 timer->tmr_device = tid->device;
783 timer->tmr_subdevice = tid->subdevice;
784 if (id)
785 strlcpy(timer->id, id, sizeof(timer->id));
786 INIT_LIST_HEAD(&timer->device_list);
787 INIT_LIST_HEAD(&timer->open_list_head);
788 INIT_LIST_HEAD(&timer->active_list_head);
789 INIT_LIST_HEAD(&timer->ack_list_head);
790 INIT_LIST_HEAD(&timer->sack_list_head);
791 spin_lock_init(&timer->lock);
792 tasklet_init(&timer->task_queue, snd_timer_tasklet,
793 (unsigned long)timer);
794 if (card != NULL) {
795 timer->module = card->module;
796 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
797 if (err < 0) {
798 snd_timer_free(timer);
799 return err;
800 }
801 }
802 if (rtimer)
803 *rtimer = timer;
804 return 0;
805 }
806
807 static int snd_timer_free(struct snd_timer *timer)
808 {
809 if (!timer)
810 return 0;
811
812 mutex_lock(&register_mutex);
813 if (! list_empty(&timer->open_list_head)) {
814 struct list_head *p, *n;
815 struct snd_timer_instance *ti;
816 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
817 list_for_each_safe(p, n, &timer->open_list_head) {
818 list_del_init(p);
819 ti = list_entry(p, struct snd_timer_instance, open_list);
820 ti->timer = NULL;
821 }
822 }
823 list_del(&timer->device_list);
824 mutex_unlock(&register_mutex);
825
826 if (timer->private_free)
827 timer->private_free(timer);
828 kfree(timer);
829 return 0;
830 }
831
832 static int snd_timer_dev_free(struct snd_device *device)
833 {
834 struct snd_timer *timer = device->device_data;
835 return snd_timer_free(timer);
836 }
837
838 static int snd_timer_dev_register(struct snd_device *dev)
839 {
840 struct snd_timer *timer = dev->device_data;
841 struct snd_timer *timer1;
842
843 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
844 return -ENXIO;
845 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
846 !timer->hw.resolution && timer->hw.c_resolution == NULL)
847 return -EINVAL;
848
849 mutex_lock(&register_mutex);
850 list_for_each_entry(timer1, &snd_timer_list, device_list) {
851 if (timer1->tmr_class > timer->tmr_class)
852 break;
853 if (timer1->tmr_class < timer->tmr_class)
854 continue;
855 if (timer1->card && timer->card) {
856 if (timer1->card->number > timer->card->number)
857 break;
858 if (timer1->card->number < timer->card->number)
859 continue;
860 }
861 if (timer1->tmr_device > timer->tmr_device)
862 break;
863 if (timer1->tmr_device < timer->tmr_device)
864 continue;
865 if (timer1->tmr_subdevice > timer->tmr_subdevice)
866 break;
867 if (timer1->tmr_subdevice < timer->tmr_subdevice)
868 continue;
869 /* conflicts.. */
870 mutex_unlock(&register_mutex);
871 return -EBUSY;
872 }
873 list_add_tail(&timer->device_list, &timer1->device_list);
874 mutex_unlock(&register_mutex);
875 return 0;
876 }
877
878 static int snd_timer_dev_disconnect(struct snd_device *device)
879 {
880 struct snd_timer *timer = device->device_data;
881 mutex_lock(&register_mutex);
882 list_del_init(&timer->device_list);
883 mutex_unlock(&register_mutex);
884 return 0;
885 }
886
887 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
888 {
889 unsigned long flags;
890 unsigned long resolution = 0;
891 struct snd_timer_instance *ti, *ts;
892
893 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
894 return;
895 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
896 event > SNDRV_TIMER_EVENT_MRESUME))
897 return;
898 spin_lock_irqsave(&timer->lock, flags);
899 if (event == SNDRV_TIMER_EVENT_MSTART ||
900 event == SNDRV_TIMER_EVENT_MCONTINUE ||
901 event == SNDRV_TIMER_EVENT_MRESUME) {
902 if (timer->hw.c_resolution)
903 resolution = timer->hw.c_resolution(timer);
904 else
905 resolution = timer->hw.resolution;
906 }
907 list_for_each_entry(ti, &timer->active_list_head, active_list) {
908 if (ti->ccallback)
909 ti->ccallback(ti, event, tstamp, resolution);
910 list_for_each_entry(ts, &ti->slave_active_head, active_list)
911 if (ts->ccallback)
912 ts->ccallback(ts, event, tstamp, resolution);
913 }
914 spin_unlock_irqrestore(&timer->lock, flags);
915 }
916
917 /*
918 * exported functions for global timers
919 */
920 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
921 {
922 struct snd_timer_id tid;
923
924 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
925 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
926 tid.card = -1;
927 tid.device = device;
928 tid.subdevice = 0;
929 return snd_timer_new(NULL, id, &tid, rtimer);
930 }
931
932 int snd_timer_global_free(struct snd_timer *timer)
933 {
934 return snd_timer_free(timer);
935 }
936
937 int snd_timer_global_register(struct snd_timer *timer)
938 {
939 struct snd_device dev;
940
941 memset(&dev, 0, sizeof(dev));
942 dev.device_data = timer;
943 return snd_timer_dev_register(&dev);
944 }
945
946 /*
947 * System timer
948 */
949
950 struct snd_timer_system_private {
951 struct timer_list tlist;
952 unsigned long last_expires;
953 unsigned long last_jiffies;
954 unsigned long correction;
955 };
956
957 static void snd_timer_s_function(unsigned long data)
958 {
959 struct snd_timer *timer = (struct snd_timer *)data;
960 struct snd_timer_system_private *priv = timer->private_data;
961 unsigned long jiff = jiffies;
962 if (time_after(jiff, priv->last_expires))
963 priv->correction += (long)jiff - (long)priv->last_expires;
964 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
965 }
966
967 static int snd_timer_s_start(struct snd_timer * timer)
968 {
969 struct snd_timer_system_private *priv;
970 unsigned long njiff;
971
972 priv = (struct snd_timer_system_private *) timer->private_data;
973 njiff = (priv->last_jiffies = jiffies);
974 if (priv->correction > timer->sticks - 1) {
975 priv->correction -= timer->sticks - 1;
976 njiff++;
977 } else {
978 njiff += timer->sticks - priv->correction;
979 priv->correction = 0;
980 }
981 priv->last_expires = priv->tlist.expires = njiff;
982 add_timer(&priv->tlist);
983 return 0;
984 }
985
986 static int snd_timer_s_stop(struct snd_timer * timer)
987 {
988 struct snd_timer_system_private *priv;
989 unsigned long jiff;
990
991 priv = (struct snd_timer_system_private *) timer->private_data;
992 del_timer(&priv->tlist);
993 jiff = jiffies;
994 if (time_before(jiff, priv->last_expires))
995 timer->sticks = priv->last_expires - jiff;
996 else
997 timer->sticks = 1;
998 priv->correction = 0;
999 return 0;
1000 }
1001
1002 static struct snd_timer_hardware snd_timer_system =
1003 {
1004 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1005 .resolution = 1000000000L / HZ,
1006 .ticks = 10000000L,
1007 .start = snd_timer_s_start,
1008 .stop = snd_timer_s_stop
1009 };
1010
1011 static void snd_timer_free_system(struct snd_timer *timer)
1012 {
1013 kfree(timer->private_data);
1014 }
1015
1016 static int snd_timer_register_system(void)
1017 {
1018 struct snd_timer *timer;
1019 struct snd_timer_system_private *priv;
1020 int err;
1021
1022 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1023 if (err < 0)
1024 return err;
1025 strcpy(timer->name, "system timer");
1026 timer->hw = snd_timer_system;
1027 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1028 if (priv == NULL) {
1029 snd_timer_free(timer);
1030 return -ENOMEM;
1031 }
1032 init_timer(&priv->tlist);
1033 priv->tlist.function = snd_timer_s_function;
1034 priv->tlist.data = (unsigned long) timer;
1035 timer->private_data = priv;
1036 timer->private_free = snd_timer_free_system;
1037 return snd_timer_global_register(timer);
1038 }
1039
1040 #ifdef CONFIG_PROC_FS
1041 /*
1042 * Info interface
1043 */
1044
1045 static void snd_timer_proc_read(struct snd_info_entry *entry,
1046 struct snd_info_buffer *buffer)
1047 {
1048 struct snd_timer *timer;
1049 struct snd_timer_instance *ti;
1050
1051 mutex_lock(&register_mutex);
1052 list_for_each_entry(timer, &snd_timer_list, device_list) {
1053 switch (timer->tmr_class) {
1054 case SNDRV_TIMER_CLASS_GLOBAL:
1055 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1056 break;
1057 case SNDRV_TIMER_CLASS_CARD:
1058 snd_iprintf(buffer, "C%i-%i: ",
1059 timer->card->number, timer->tmr_device);
1060 break;
1061 case SNDRV_TIMER_CLASS_PCM:
1062 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1063 timer->tmr_device, timer->tmr_subdevice);
1064 break;
1065 default:
1066 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1067 timer->card ? timer->card->number : -1,
1068 timer->tmr_device, timer->tmr_subdevice);
1069 }
1070 snd_iprintf(buffer, "%s :", timer->name);
1071 if (timer->hw.resolution)
1072 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1073 timer->hw.resolution / 1000,
1074 timer->hw.resolution % 1000,
1075 timer->hw.ticks);
1076 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1077 snd_iprintf(buffer, " SLAVE");
1078 snd_iprintf(buffer, "\n");
1079 list_for_each_entry(ti, &timer->open_list_head, open_list)
1080 snd_iprintf(buffer, " Client %s : %s\n",
1081 ti->owner ? ti->owner : "unknown",
1082 ti->flags & (SNDRV_TIMER_IFLG_START |
1083 SNDRV_TIMER_IFLG_RUNNING)
1084 ? "running" : "stopped");
1085 }
1086 mutex_unlock(&register_mutex);
1087 }
1088
1089 static struct snd_info_entry *snd_timer_proc_entry;
1090
1091 static void __init snd_timer_proc_init(void)
1092 {
1093 struct snd_info_entry *entry;
1094
1095 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1096 if (entry != NULL) {
1097 entry->c.text.read = snd_timer_proc_read;
1098 if (snd_info_register(entry) < 0) {
1099 snd_info_free_entry(entry);
1100 entry = NULL;
1101 }
1102 }
1103 snd_timer_proc_entry = entry;
1104 }
1105
1106 static void __exit snd_timer_proc_done(void)
1107 {
1108 snd_info_free_entry(snd_timer_proc_entry);
1109 }
1110 #else /* !CONFIG_PROC_FS */
1111 #define snd_timer_proc_init()
1112 #define snd_timer_proc_done()
1113 #endif
1114
1115 /*
1116 * USER SPACE interface
1117 */
1118
1119 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1120 unsigned long resolution,
1121 unsigned long ticks)
1122 {
1123 struct snd_timer_user *tu = timeri->callback_data;
1124 struct snd_timer_read *r;
1125 int prev;
1126
1127 spin_lock(&tu->qlock);
1128 if (tu->qused > 0) {
1129 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1130 r = &tu->queue[prev];
1131 if (r->resolution == resolution) {
1132 r->ticks += ticks;
1133 goto __wake;
1134 }
1135 }
1136 if (tu->qused >= tu->queue_size) {
1137 tu->overrun++;
1138 } else {
1139 r = &tu->queue[tu->qtail++];
1140 tu->qtail %= tu->queue_size;
1141 r->resolution = resolution;
1142 r->ticks = ticks;
1143 tu->qused++;
1144 }
1145 __wake:
1146 spin_unlock(&tu->qlock);
1147 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1148 wake_up(&tu->qchange_sleep);
1149 }
1150
1151 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1152 struct snd_timer_tread *tread)
1153 {
1154 if (tu->qused >= tu->queue_size) {
1155 tu->overrun++;
1156 } else {
1157 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1158 tu->qtail %= tu->queue_size;
1159 tu->qused++;
1160 }
1161 }
1162
1163 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1164 int event,
1165 struct timespec *tstamp,
1166 unsigned long resolution)
1167 {
1168 struct snd_timer_user *tu = timeri->callback_data;
1169 struct snd_timer_tread r1;
1170 unsigned long flags;
1171
1172 if (event >= SNDRV_TIMER_EVENT_START &&
1173 event <= SNDRV_TIMER_EVENT_PAUSE)
1174 tu->tstamp = *tstamp;
1175 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1176 return;
1177 memset(&r1, 0, sizeof(r1));
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 memset(&r1, 0, sizeof(r1));
1213 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1214 r1.tstamp = tstamp;
1215 r1.val = resolution;
1216 snd_timer_user_append_to_tqueue(tu, &r1);
1217 tu->last_resolution = resolution;
1218 append++;
1219 }
1220 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1221 goto __wake;
1222 if (ticks == 0)
1223 goto __wake;
1224 if (tu->qused > 0) {
1225 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1226 r = &tu->tqueue[prev];
1227 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1228 r->tstamp = tstamp;
1229 r->val += ticks;
1230 append++;
1231 goto __wake;
1232 }
1233 }
1234 r1.event = SNDRV_TIMER_EVENT_TICK;
1235 r1.tstamp = tstamp;
1236 r1.val = ticks;
1237 snd_timer_user_append_to_tqueue(tu, &r1);
1238 append++;
1239 __wake:
1240 spin_unlock(&tu->qlock);
1241 if (append == 0)
1242 return;
1243 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1244 wake_up(&tu->qchange_sleep);
1245 }
1246
1247 static int snd_timer_user_open(struct inode *inode, struct file *file)
1248 {
1249 struct snd_timer_user *tu;
1250 int err;
1251
1252 err = nonseekable_open(inode, file);
1253 if (err < 0)
1254 return err;
1255
1256 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1257 if (tu == NULL)
1258 return -ENOMEM;
1259 spin_lock_init(&tu->qlock);
1260 init_waitqueue_head(&tu->qchange_sleep);
1261 mutex_init(&tu->ioctl_lock);
1262 tu->ticks = 1;
1263 tu->queue_size = 128;
1264 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1265 GFP_KERNEL);
1266 if (tu->queue == NULL) {
1267 kfree(tu);
1268 return -ENOMEM;
1269 }
1270 file->private_data = tu;
1271 return 0;
1272 }
1273
1274 static int snd_timer_user_release(struct inode *inode, struct file *file)
1275 {
1276 struct snd_timer_user *tu;
1277
1278 if (file->private_data) {
1279 tu = file->private_data;
1280 file->private_data = NULL;
1281 mutex_lock(&tu->ioctl_lock);
1282 if (tu->timeri)
1283 snd_timer_close(tu->timeri);
1284 mutex_unlock(&tu->ioctl_lock);
1285 kfree(tu->queue);
1286 kfree(tu->tqueue);
1287 kfree(tu);
1288 }
1289 return 0;
1290 }
1291
1292 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1293 {
1294 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1295 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1296 id->card = -1;
1297 id->device = -1;
1298 id->subdevice = -1;
1299 }
1300
1301 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1302 {
1303 id->dev_class = timer->tmr_class;
1304 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1305 id->card = timer->card ? timer->card->number : -1;
1306 id->device = timer->tmr_device;
1307 id->subdevice = timer->tmr_subdevice;
1308 }
1309
1310 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1311 {
1312 struct snd_timer_id id;
1313 struct snd_timer *timer;
1314 struct list_head *p;
1315
1316 if (copy_from_user(&id, _tid, sizeof(id)))
1317 return -EFAULT;
1318 mutex_lock(&register_mutex);
1319 if (id.dev_class < 0) { /* first item */
1320 if (list_empty(&snd_timer_list))
1321 snd_timer_user_zero_id(&id);
1322 else {
1323 timer = list_entry(snd_timer_list.next,
1324 struct snd_timer, device_list);
1325 snd_timer_user_copy_id(&id, timer);
1326 }
1327 } else {
1328 switch (id.dev_class) {
1329 case SNDRV_TIMER_CLASS_GLOBAL:
1330 id.device = id.device < 0 ? 0 : id.device + 1;
1331 list_for_each(p, &snd_timer_list) {
1332 timer = list_entry(p, struct snd_timer, device_list);
1333 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1334 snd_timer_user_copy_id(&id, timer);
1335 break;
1336 }
1337 if (timer->tmr_device >= id.device) {
1338 snd_timer_user_copy_id(&id, timer);
1339 break;
1340 }
1341 }
1342 if (p == &snd_timer_list)
1343 snd_timer_user_zero_id(&id);
1344 break;
1345 case SNDRV_TIMER_CLASS_CARD:
1346 case SNDRV_TIMER_CLASS_PCM:
1347 if (id.card < 0) {
1348 id.card = 0;
1349 } else {
1350 if (id.card < 0) {
1351 id.card = 0;
1352 } else {
1353 if (id.device < 0) {
1354 id.device = 0;
1355 } else {
1356 if (id.subdevice < 0) {
1357 id.subdevice = 0;
1358 } else {
1359 id.subdevice++;
1360 }
1361 }
1362 }
1363 }
1364 list_for_each(p, &snd_timer_list) {
1365 timer = list_entry(p, struct snd_timer, device_list);
1366 if (timer->tmr_class > id.dev_class) {
1367 snd_timer_user_copy_id(&id, timer);
1368 break;
1369 }
1370 if (timer->tmr_class < id.dev_class)
1371 continue;
1372 if (timer->card->number > id.card) {
1373 snd_timer_user_copy_id(&id, timer);
1374 break;
1375 }
1376 if (timer->card->number < id.card)
1377 continue;
1378 if (timer->tmr_device > id.device) {
1379 snd_timer_user_copy_id(&id, timer);
1380 break;
1381 }
1382 if (timer->tmr_device < id.device)
1383 continue;
1384 if (timer->tmr_subdevice > id.subdevice) {
1385 snd_timer_user_copy_id(&id, timer);
1386 break;
1387 }
1388 if (timer->tmr_subdevice < id.subdevice)
1389 continue;
1390 snd_timer_user_copy_id(&id, timer);
1391 break;
1392 }
1393 if (p == &snd_timer_list)
1394 snd_timer_user_zero_id(&id);
1395 break;
1396 default:
1397 snd_timer_user_zero_id(&id);
1398 }
1399 }
1400 mutex_unlock(&register_mutex);
1401 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1402 return -EFAULT;
1403 return 0;
1404 }
1405
1406 static int snd_timer_user_ginfo(struct file *file,
1407 struct snd_timer_ginfo __user *_ginfo)
1408 {
1409 struct snd_timer_ginfo *ginfo;
1410 struct snd_timer_id tid;
1411 struct snd_timer *t;
1412 struct list_head *p;
1413 int err = 0;
1414
1415 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1416 if (IS_ERR(ginfo))
1417 return PTR_ERR(ginfo);
1418
1419 tid = ginfo->tid;
1420 memset(ginfo, 0, sizeof(*ginfo));
1421 ginfo->tid = tid;
1422 mutex_lock(&register_mutex);
1423 t = snd_timer_find(&tid);
1424 if (t != NULL) {
1425 ginfo->card = t->card ? t->card->number : -1;
1426 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1427 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1428 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1429 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1430 ginfo->resolution = t->hw.resolution;
1431 if (t->hw.resolution_min > 0) {
1432 ginfo->resolution_min = t->hw.resolution_min;
1433 ginfo->resolution_max = t->hw.resolution_max;
1434 }
1435 list_for_each(p, &t->open_list_head) {
1436 ginfo->clients++;
1437 }
1438 } else {
1439 err = -ENODEV;
1440 }
1441 mutex_unlock(&register_mutex);
1442 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1443 err = -EFAULT;
1444 kfree(ginfo);
1445 return err;
1446 }
1447
1448 static int snd_timer_user_gparams(struct file *file,
1449 struct snd_timer_gparams __user *_gparams)
1450 {
1451 struct snd_timer_gparams gparams;
1452 struct snd_timer *t;
1453 int err;
1454
1455 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1456 return -EFAULT;
1457 mutex_lock(&register_mutex);
1458 t = snd_timer_find(&gparams.tid);
1459 if (!t) {
1460 err = -ENODEV;
1461 goto _error;
1462 }
1463 if (!list_empty(&t->open_list_head)) {
1464 err = -EBUSY;
1465 goto _error;
1466 }
1467 if (!t->hw.set_period) {
1468 err = -ENOSYS;
1469 goto _error;
1470 }
1471 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1472 _error:
1473 mutex_unlock(&register_mutex);
1474 return err;
1475 }
1476
1477 static int snd_timer_user_gstatus(struct file *file,
1478 struct snd_timer_gstatus __user *_gstatus)
1479 {
1480 struct snd_timer_gstatus gstatus;
1481 struct snd_timer_id tid;
1482 struct snd_timer *t;
1483 int err = 0;
1484
1485 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1486 return -EFAULT;
1487 tid = gstatus.tid;
1488 memset(&gstatus, 0, sizeof(gstatus));
1489 gstatus.tid = tid;
1490 mutex_lock(&register_mutex);
1491 t = snd_timer_find(&tid);
1492 if (t != NULL) {
1493 if (t->hw.c_resolution)
1494 gstatus.resolution = t->hw.c_resolution(t);
1495 else
1496 gstatus.resolution = t->hw.resolution;
1497 if (t->hw.precise_resolution) {
1498 t->hw.precise_resolution(t, &gstatus.resolution_num,
1499 &gstatus.resolution_den);
1500 } else {
1501 gstatus.resolution_num = gstatus.resolution;
1502 gstatus.resolution_den = 1000000000uL;
1503 }
1504 } else {
1505 err = -ENODEV;
1506 }
1507 mutex_unlock(&register_mutex);
1508 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1509 err = -EFAULT;
1510 return err;
1511 }
1512
1513 static int snd_timer_user_tselect(struct file *file,
1514 struct snd_timer_select __user *_tselect)
1515 {
1516 struct snd_timer_user *tu;
1517 struct snd_timer_select tselect;
1518 char str[32];
1519 int err = 0;
1520
1521 tu = file->private_data;
1522 if (tu->timeri) {
1523 snd_timer_close(tu->timeri);
1524 tu->timeri = NULL;
1525 }
1526 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1527 err = -EFAULT;
1528 goto __err;
1529 }
1530 sprintf(str, "application %i", current->pid);
1531 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1532 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1533 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1534 if (err < 0)
1535 goto __err;
1536
1537 kfree(tu->queue);
1538 tu->queue = NULL;
1539 kfree(tu->tqueue);
1540 tu->tqueue = NULL;
1541 if (tu->tread) {
1542 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1543 GFP_KERNEL);
1544 if (tu->tqueue == NULL)
1545 err = -ENOMEM;
1546 } else {
1547 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1548 GFP_KERNEL);
1549 if (tu->queue == NULL)
1550 err = -ENOMEM;
1551 }
1552
1553 if (err < 0) {
1554 snd_timer_close(tu->timeri);
1555 tu->timeri = NULL;
1556 } else {
1557 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1558 tu->timeri->callback = tu->tread
1559 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1560 tu->timeri->ccallback = snd_timer_user_ccallback;
1561 tu->timeri->callback_data = (void *)tu;
1562 }
1563
1564 __err:
1565 return err;
1566 }
1567
1568 static int snd_timer_user_info(struct file *file,
1569 struct snd_timer_info __user *_info)
1570 {
1571 struct snd_timer_user *tu;
1572 struct snd_timer_info *info;
1573 struct snd_timer *t;
1574 int err = 0;
1575
1576 tu = file->private_data;
1577 if (!tu->timeri)
1578 return -EBADFD;
1579 t = tu->timeri->timer;
1580 if (!t)
1581 return -EBADFD;
1582
1583 info = kzalloc(sizeof(*info), GFP_KERNEL);
1584 if (! info)
1585 return -ENOMEM;
1586 info->card = t->card ? t->card->number : -1;
1587 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1588 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1589 strlcpy(info->id, t->id, sizeof(info->id));
1590 strlcpy(info->name, t->name, sizeof(info->name));
1591 info->resolution = t->hw.resolution;
1592 if (copy_to_user(_info, info, sizeof(*_info)))
1593 err = -EFAULT;
1594 kfree(info);
1595 return err;
1596 }
1597
1598 static int snd_timer_user_params(struct file *file,
1599 struct snd_timer_params __user *_params)
1600 {
1601 struct snd_timer_user *tu;
1602 struct snd_timer_params params;
1603 struct snd_timer *t;
1604 struct snd_timer_read *tr;
1605 struct snd_timer_tread *ttr;
1606 int err;
1607
1608 tu = file->private_data;
1609 if (!tu->timeri)
1610 return -EBADFD;
1611 t = tu->timeri->timer;
1612 if (!t)
1613 return -EBADFD;
1614 if (copy_from_user(&params, _params, sizeof(params)))
1615 return -EFAULT;
1616 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1617 err = -EINVAL;
1618 goto _end;
1619 }
1620 if (params.queue_size > 0 &&
1621 (params.queue_size < 32 || params.queue_size > 1024)) {
1622 err = -EINVAL;
1623 goto _end;
1624 }
1625 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1626 (1<<SNDRV_TIMER_EVENT_TICK)|
1627 (1<<SNDRV_TIMER_EVENT_START)|
1628 (1<<SNDRV_TIMER_EVENT_STOP)|
1629 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1630 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1631 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1632 (1<<SNDRV_TIMER_EVENT_RESUME)|
1633 (1<<SNDRV_TIMER_EVENT_MSTART)|
1634 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1635 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1636 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1637 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1638 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1639 err = -EINVAL;
1640 goto _end;
1641 }
1642 snd_timer_stop(tu->timeri);
1643 spin_lock_irq(&t->lock);
1644 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1645 SNDRV_TIMER_IFLG_EXCLUSIVE|
1646 SNDRV_TIMER_IFLG_EARLY_EVENT);
1647 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1648 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1649 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1650 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1651 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1652 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1653 spin_unlock_irq(&t->lock);
1654 if (params.queue_size > 0 &&
1655 (unsigned int)tu->queue_size != params.queue_size) {
1656 if (tu->tread) {
1657 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1658 GFP_KERNEL);
1659 if (ttr) {
1660 kfree(tu->tqueue);
1661 tu->queue_size = params.queue_size;
1662 tu->tqueue = ttr;
1663 }
1664 } else {
1665 tr = kmalloc(params.queue_size * sizeof(*tr),
1666 GFP_KERNEL);
1667 if (tr) {
1668 kfree(tu->queue);
1669 tu->queue_size = params.queue_size;
1670 tu->queue = tr;
1671 }
1672 }
1673 }
1674 tu->qhead = tu->qtail = tu->qused = 0;
1675 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1676 if (tu->tread) {
1677 struct snd_timer_tread tread;
1678 memset(&tread, 0, sizeof(tread));
1679 tread.event = SNDRV_TIMER_EVENT_EARLY;
1680 tread.tstamp.tv_sec = 0;
1681 tread.tstamp.tv_nsec = 0;
1682 tread.val = 0;
1683 snd_timer_user_append_to_tqueue(tu, &tread);
1684 } else {
1685 struct snd_timer_read *r = &tu->queue[0];
1686 r->resolution = 0;
1687 r->ticks = 0;
1688 tu->qused++;
1689 tu->qtail++;
1690 }
1691 }
1692 tu->filter = params.filter;
1693 tu->ticks = params.ticks;
1694 err = 0;
1695 _end:
1696 if (copy_to_user(_params, &params, sizeof(params)))
1697 return -EFAULT;
1698 return err;
1699 }
1700
1701 static int snd_timer_user_status(struct file *file,
1702 struct snd_timer_status __user *_status)
1703 {
1704 struct snd_timer_user *tu;
1705 struct snd_timer_status status;
1706
1707 tu = file->private_data;
1708 if (!tu->timeri)
1709 return -EBADFD;
1710 memset(&status, 0, sizeof(status));
1711 status.tstamp = tu->tstamp;
1712 status.resolution = snd_timer_resolution(tu->timeri);
1713 status.lost = tu->timeri->lost;
1714 status.overrun = tu->overrun;
1715 spin_lock_irq(&tu->qlock);
1716 status.queue = tu->qused;
1717 spin_unlock_irq(&tu->qlock);
1718 if (copy_to_user(_status, &status, sizeof(status)))
1719 return -EFAULT;
1720 return 0;
1721 }
1722
1723 static int snd_timer_user_start(struct file *file)
1724 {
1725 int err;
1726 struct snd_timer_user *tu;
1727
1728 tu = file->private_data;
1729 if (!tu->timeri)
1730 return -EBADFD;
1731 snd_timer_stop(tu->timeri);
1732 tu->timeri->lost = 0;
1733 tu->last_resolution = 0;
1734 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1735 }
1736
1737 static int snd_timer_user_stop(struct file *file)
1738 {
1739 int err;
1740 struct snd_timer_user *tu;
1741
1742 tu = file->private_data;
1743 if (!tu->timeri)
1744 return -EBADFD;
1745 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1746 }
1747
1748 static int snd_timer_user_continue(struct file *file)
1749 {
1750 int err;
1751 struct snd_timer_user *tu;
1752
1753 tu = file->private_data;
1754 if (!tu->timeri)
1755 return -EBADFD;
1756 tu->timeri->lost = 0;
1757 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1758 }
1759
1760 static int snd_timer_user_pause(struct file *file)
1761 {
1762 int err;
1763 struct snd_timer_user *tu;
1764
1765 tu = file->private_data;
1766 if (!tu->timeri)
1767 return -EBADFD;
1768 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1769 }
1770
1771 enum {
1772 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1773 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1774 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1775 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1776 };
1777
1778 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1779 unsigned long arg)
1780 {
1781 struct snd_timer_user *tu;
1782 void __user *argp = (void __user *)arg;
1783 int __user *p = argp;
1784
1785 tu = file->private_data;
1786 switch (cmd) {
1787 case SNDRV_TIMER_IOCTL_PVERSION:
1788 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1789 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1790 return snd_timer_user_next_device(argp);
1791 case SNDRV_TIMER_IOCTL_TREAD:
1792 {
1793 int xarg;
1794
1795 if (tu->timeri) /* too late */
1796 return -EBUSY;
1797 if (get_user(xarg, p))
1798 return -EFAULT;
1799 tu->tread = xarg ? 1 : 0;
1800 return 0;
1801 }
1802 case SNDRV_TIMER_IOCTL_GINFO:
1803 return snd_timer_user_ginfo(file, argp);
1804 case SNDRV_TIMER_IOCTL_GPARAMS:
1805 return snd_timer_user_gparams(file, argp);
1806 case SNDRV_TIMER_IOCTL_GSTATUS:
1807 return snd_timer_user_gstatus(file, argp);
1808 case SNDRV_TIMER_IOCTL_SELECT:
1809 return snd_timer_user_tselect(file, argp);
1810 case SNDRV_TIMER_IOCTL_INFO:
1811 return snd_timer_user_info(file, argp);
1812 case SNDRV_TIMER_IOCTL_PARAMS:
1813 return snd_timer_user_params(file, argp);
1814 case SNDRV_TIMER_IOCTL_STATUS:
1815 return snd_timer_user_status(file, argp);
1816 case SNDRV_TIMER_IOCTL_START:
1817 case SNDRV_TIMER_IOCTL_START_OLD:
1818 return snd_timer_user_start(file);
1819 case SNDRV_TIMER_IOCTL_STOP:
1820 case SNDRV_TIMER_IOCTL_STOP_OLD:
1821 return snd_timer_user_stop(file);
1822 case SNDRV_TIMER_IOCTL_CONTINUE:
1823 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1824 return snd_timer_user_continue(file);
1825 case SNDRV_TIMER_IOCTL_PAUSE:
1826 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1827 return snd_timer_user_pause(file);
1828 }
1829 return -ENOTTY;
1830 }
1831
1832 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1833 unsigned long arg)
1834 {
1835 struct snd_timer_user *tu = file->private_data;
1836 long ret;
1837
1838 mutex_lock(&tu->ioctl_lock);
1839 ret = __snd_timer_user_ioctl(file, cmd, arg);
1840 mutex_unlock(&tu->ioctl_lock);
1841 return ret;
1842 }
1843
1844 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1845 {
1846 struct snd_timer_user *tu;
1847
1848 tu = file->private_data;
1849 return fasync_helper(fd, file, on, &tu->fasync);
1850 }
1851
1852 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1853 size_t count, loff_t *offset)
1854 {
1855 struct snd_timer_user *tu;
1856 long result = 0, unit;
1857 int err = 0;
1858
1859 tu = file->private_data;
1860 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1861 spin_lock_irq(&tu->qlock);
1862 while ((long)count - result >= unit) {
1863 while (!tu->qused) {
1864 wait_queue_t wait;
1865
1866 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1867 err = -EAGAIN;
1868 break;
1869 }
1870
1871 set_current_state(TASK_INTERRUPTIBLE);
1872 init_waitqueue_entry(&wait, current);
1873 add_wait_queue(&tu->qchange_sleep, &wait);
1874
1875 spin_unlock_irq(&tu->qlock);
1876 schedule();
1877 spin_lock_irq(&tu->qlock);
1878
1879 remove_wait_queue(&tu->qchange_sleep, &wait);
1880
1881 if (signal_pending(current)) {
1882 err = -ERESTARTSYS;
1883 break;
1884 }
1885 }
1886
1887 spin_unlock_irq(&tu->qlock);
1888 if (err < 0)
1889 goto _error;
1890
1891 if (tu->tread) {
1892 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1893 sizeof(struct snd_timer_tread))) {
1894 err = -EFAULT;
1895 goto _error;
1896 }
1897 } else {
1898 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1899 sizeof(struct snd_timer_read))) {
1900 err = -EFAULT;
1901 goto _error;
1902 }
1903 }
1904
1905 tu->qhead %= tu->queue_size;
1906
1907 result += unit;
1908 buffer += unit;
1909
1910 spin_lock_irq(&tu->qlock);
1911 tu->qused--;
1912 }
1913 spin_unlock_irq(&tu->qlock);
1914 _error:
1915 return result > 0 ? result : err;
1916 }
1917
1918 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1919 {
1920 unsigned int mask;
1921 struct snd_timer_user *tu;
1922
1923 tu = file->private_data;
1924
1925 poll_wait(file, &tu->qchange_sleep, wait);
1926
1927 mask = 0;
1928 if (tu->qused)
1929 mask |= POLLIN | POLLRDNORM;
1930
1931 return mask;
1932 }
1933
1934 #ifdef CONFIG_COMPAT
1935 #include "timer_compat.c"
1936 #else
1937 #define snd_timer_user_ioctl_compat NULL
1938 #endif
1939
1940 static const struct file_operations snd_timer_f_ops =
1941 {
1942 .owner = THIS_MODULE,
1943 .read = snd_timer_user_read,
1944 .open = snd_timer_user_open,
1945 .release = snd_timer_user_release,
1946 .llseek = no_llseek,
1947 .poll = snd_timer_user_poll,
1948 .unlocked_ioctl = snd_timer_user_ioctl,
1949 .compat_ioctl = snd_timer_user_ioctl_compat,
1950 .fasync = snd_timer_user_fasync,
1951 };
1952
1953 /*
1954 * ENTRY functions
1955 */
1956
1957 static int __init alsa_timer_init(void)
1958 {
1959 int err;
1960
1961 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1962 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1963 "system timer");
1964 #endif
1965
1966 if ((err = snd_timer_register_system()) < 0)
1967 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1968 err);
1969 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1970 &snd_timer_f_ops, NULL, "timer")) < 0)
1971 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1972 err);
1973 snd_timer_proc_init();
1974 return 0;
1975 }
1976
1977 static void __exit alsa_timer_exit(void)
1978 {
1979 struct list_head *p, *n;
1980
1981 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1982 /* unregister the system timer */
1983 list_for_each_safe(p, n, &snd_timer_list) {
1984 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1985 snd_timer_free(timer);
1986 }
1987 snd_timer_proc_done();
1988 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1989 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1990 #endif
1991 }
1992
1993 module_init(alsa_timer_init)
1994 module_exit(alsa_timer_exit)
1995
1996 EXPORT_SYMBOL(snd_timer_open);
1997 EXPORT_SYMBOL(snd_timer_close);
1998 EXPORT_SYMBOL(snd_timer_resolution);
1999 EXPORT_SYMBOL(snd_timer_start);
2000 EXPORT_SYMBOL(snd_timer_stop);
2001 EXPORT_SYMBOL(snd_timer_continue);
2002 EXPORT_SYMBOL(snd_timer_pause);
2003 EXPORT_SYMBOL(snd_timer_new);
2004 EXPORT_SYMBOL(snd_timer_notify);
2005 EXPORT_SYMBOL(snd_timer_global_new);
2006 EXPORT_SYMBOL(snd_timer_global_free);
2007 EXPORT_SYMBOL(snd_timer_global_register);
2008 EXPORT_SYMBOL(snd_timer_interrupt);
kernel source for telekom puls (alcatel/mediatek)