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decnet: Convert to use flowidn where applicable.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / sound / core / timer.c
blobed016329e911e9ab77d95b3abb7e2a44693363df
1 /*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <linux/moduleparam.h>
28 #include <linux/string.h>
29 #include <sound/core.h>
30 #include <sound/timer.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33 #include <sound/minors.h>
34 #include <sound/initval.h>
35 #include <linux/kmod.h>
36
37 #if defined(CONFIG_SND_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE)
38 #define DEFAULT_TIMER_LIMIT 4
39 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
40 #define DEFAULT_TIMER_LIMIT 2
41 #else
42 #define DEFAULT_TIMER_LIMIT 1
43 #endif
44
45 static int timer_limit = DEFAULT_TIMER_LIMIT;
46 static int timer_tstamp_monotonic = 1;
47 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
48 MODULE_DESCRIPTION("ALSA timer interface");
49 MODULE_LICENSE("GPL");
50 module_param(timer_limit, int, 0444);
51 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
52 module_param(timer_tstamp_monotonic, int, 0444);
53 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
54
55 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
56 MODULE_ALIAS("devname:snd/timer");
57
58 struct snd_timer_user {
59 struct snd_timer_instance *timeri;
60 int tread; /* enhanced read with timestamps and events */
61 unsigned long ticks;
62 unsigned long overrun;
63 int qhead;
64 int qtail;
65 int qused;
66 int queue_size;
67 struct snd_timer_read *queue;
68 struct snd_timer_tread *tqueue;
69 spinlock_t qlock;
70 unsigned long last_resolution;
71 unsigned int filter;
72 struct timespec tstamp; /* trigger tstamp */
73 wait_queue_head_t qchange_sleep;
74 struct fasync_struct *fasync;
75 struct mutex tread_sem;
76 };
77
78 /* list of timers */
79 static LIST_HEAD(snd_timer_list);
80
81 /* list of slave instances */
82 static LIST_HEAD(snd_timer_slave_list);
83
84 /* lock for slave active lists */
85 static DEFINE_SPINLOCK(slave_active_lock);
86
87 static DEFINE_MUTEX(register_mutex);
88
89 static int snd_timer_free(struct snd_timer *timer);
90 static int snd_timer_dev_free(struct snd_device *device);
91 static int snd_timer_dev_register(struct snd_device *device);
92 static int snd_timer_dev_disconnect(struct snd_device *device);
93
94 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
95
96 /*
97 * create a timer instance with the given owner string.
98 * when timer is not NULL, increments the module counter
99 */
100 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
101 struct snd_timer *timer)
102 {
103 struct snd_timer_instance *timeri;
104 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
105 if (timeri == NULL)
106 return NULL;
107 timeri->owner = kstrdup(owner, GFP_KERNEL);
108 if (! timeri->owner) {
109 kfree(timeri);
110 return NULL;
111 }
112 INIT_LIST_HEAD(&timeri->open_list);
113 INIT_LIST_HEAD(&timeri->active_list);
114 INIT_LIST_HEAD(&timeri->ack_list);
115 INIT_LIST_HEAD(&timeri->slave_list_head);
116 INIT_LIST_HEAD(&timeri->slave_active_head);
117
118 timeri->timer = timer;
119 if (timer && !try_module_get(timer->module)) {
120 kfree(timeri->owner);
121 kfree(timeri);
122 return NULL;
123 }
124
125 return timeri;
126 }
127
128 /*
129 * find a timer instance from the given timer id
130 */
131 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
132 {
133 struct snd_timer *timer = NULL;
134
135 list_for_each_entry(timer, &snd_timer_list, device_list) {
136 if (timer->tmr_class != tid->dev_class)
137 continue;
138 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
139 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
140 (timer->card == NULL ||
141 timer->card->number != tid->card))
142 continue;
143 if (timer->tmr_device != tid->device)
144 continue;
145 if (timer->tmr_subdevice != tid->subdevice)
146 continue;
147 return timer;
148 }
149 return NULL;
150 }
151
152 #ifdef CONFIG_MODULES
153
154 static void snd_timer_request(struct snd_timer_id *tid)
155 {
156 switch (tid->dev_class) {
157 case SNDRV_TIMER_CLASS_GLOBAL:
158 if (tid->device < timer_limit)
159 request_module("snd-timer-%i", tid->device);
160 break;
161 case SNDRV_TIMER_CLASS_CARD:
162 case SNDRV_TIMER_CLASS_PCM:
163 if (tid->card < snd_ecards_limit)
164 request_module("snd-card-%i", tid->card);
165 break;
166 default:
167 break;
168 }
169 }
170
171 #endif
172
173 /*
174 * look for a master instance matching with the slave id of the given slave.
175 * when found, relink the open_link of the slave.
176 *
177 * call this with register_mutex down.
178 */
179 static void snd_timer_check_slave(struct snd_timer_instance *slave)
180 {
181 struct snd_timer *timer;
182 struct snd_timer_instance *master;
183
184 /* FIXME: it's really dumb to look up all entries.. */
185 list_for_each_entry(timer, &snd_timer_list, device_list) {
186 list_for_each_entry(master, &timer->open_list_head, open_list) {
187 if (slave->slave_class == master->slave_class &&
188 slave->slave_id == master->slave_id) {
189 list_del(&slave->open_list);
190 list_add_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 /* wait, until the active callback is finished */
333 spin_lock_irq(&timer->lock);
334 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
335 spin_unlock_irq(&timer->lock);
336 udelay(10);
337 spin_lock_irq(&timer->lock);
338 }
339 spin_unlock_irq(&timer->lock);
340 mutex_lock(&register_mutex);
341 list_del(&timeri->open_list);
342 if (timer && list_empty(&timer->open_list_head) &&
343 timer->hw.close)
344 timer->hw.close(timer);
345 /* remove slave links */
346 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
347 open_list) {
348 spin_lock_irq(&slave_active_lock);
349 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
350 list_move_tail(&slave->open_list, &snd_timer_slave_list);
351 slave->master = NULL;
352 slave->timer = NULL;
353 spin_unlock_irq(&slave_active_lock);
354 }
355 mutex_unlock(&register_mutex);
356 }
357 if (timeri->private_free)
358 timeri->private_free(timeri);
359 kfree(timeri->owner);
360 kfree(timeri);
361 if (timer)
362 module_put(timer->module);
363 return 0;
364 }
365
366 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
367 {
368 struct snd_timer * timer;
369
370 if (timeri == NULL)
371 return 0;
372 if ((timer = timeri->timer) != NULL) {
373 if (timer->hw.c_resolution)
374 return timer->hw.c_resolution(timer);
375 return timer->hw.resolution;
376 }
377 return 0;
378 }
379
380 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
381 {
382 struct snd_timer *timer;
383 unsigned long flags;
384 unsigned long resolution = 0;
385 struct snd_timer_instance *ts;
386 struct timespec tstamp;
387
388 if (timer_tstamp_monotonic)
389 do_posix_clock_monotonic_gettime(&tstamp);
390 else
391 getnstimeofday(&tstamp);
392 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
393 event > SNDRV_TIMER_EVENT_PAUSE))
394 return;
395 if (event == SNDRV_TIMER_EVENT_START ||
396 event == SNDRV_TIMER_EVENT_CONTINUE)
397 resolution = snd_timer_resolution(ti);
398 if (ti->ccallback)
399 ti->ccallback(ti, event, &tstamp, resolution);
400 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
401 return;
402 timer = ti->timer;
403 if (timer == NULL)
404 return;
405 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
406 return;
407 spin_lock_irqsave(&timer->lock, flags);
408 list_for_each_entry(ts, &ti->slave_active_head, active_list)
409 if (ts->ccallback)
410 ts->ccallback(ti, event + 100, &tstamp, resolution);
411 spin_unlock_irqrestore(&timer->lock, flags);
412 }
413
414 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
415 unsigned long sticks)
416 {
417 list_del(&timeri->active_list);
418 list_add_tail(&timeri->active_list, &timer->active_list_head);
419 if (timer->running) {
420 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
421 goto __start_now;
422 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
423 timeri->flags |= SNDRV_TIMER_IFLG_START;
424 return 1; /* delayed start */
425 } else {
426 timer->sticks = sticks;
427 timer->hw.start(timer);
428 __start_now:
429 timer->running++;
430 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
431 return 0;
432 }
433 }
434
435 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
436 {
437 unsigned long flags;
438
439 spin_lock_irqsave(&slave_active_lock, flags);
440 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
441 if (timeri->master)
442 list_add_tail(&timeri->active_list,
443 &timeri->master->slave_active_head);
444 spin_unlock_irqrestore(&slave_active_lock, flags);
445 return 1; /* delayed start */
446 }
447
448 /*
449 * start the timer instance
450 */
451 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
452 {
453 struct snd_timer *timer;
454 int result = -EINVAL;
455 unsigned long flags;
456
457 if (timeri == NULL || ticks < 1)
458 return -EINVAL;
459 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
460 result = snd_timer_start_slave(timeri);
461 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
462 return result;
463 }
464 timer = timeri->timer;
465 if (timer == NULL)
466 return -EINVAL;
467 spin_lock_irqsave(&timer->lock, flags);
468 timeri->ticks = timeri->cticks = ticks;
469 timeri->pticks = 0;
470 result = snd_timer_start1(timer, timeri, ticks);
471 spin_unlock_irqrestore(&timer->lock, flags);
472 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
473 return result;
474 }
475
476 static int _snd_timer_stop(struct snd_timer_instance * timeri,
477 int keep_flag, int event)
478 {
479 struct snd_timer *timer;
480 unsigned long flags;
481
482 if (snd_BUG_ON(!timeri))
483 return -ENXIO;
484
485 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
486 if (!keep_flag) {
487 spin_lock_irqsave(&slave_active_lock, flags);
488 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
489 spin_unlock_irqrestore(&slave_active_lock, flags);
490 }
491 goto __end;
492 }
493 timer = timeri->timer;
494 if (!timer)
495 return -EINVAL;
496 spin_lock_irqsave(&timer->lock, flags);
497 list_del_init(&timeri->ack_list);
498 list_del_init(&timeri->active_list);
499 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
500 !(--timer->running)) {
501 timer->hw.stop(timer);
502 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
503 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
504 snd_timer_reschedule(timer, 0);
505 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
506 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
507 timer->hw.start(timer);
508 }
509 }
510 }
511 if (!keep_flag)
512 timeri->flags &=
513 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
514 spin_unlock_irqrestore(&timer->lock, flags);
515 __end:
516 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
517 snd_timer_notify1(timeri, event);
518 return 0;
519 }
520
521 /*
522 * stop the timer instance.
523 *
524 * do not call this from the timer callback!
525 */
526 int snd_timer_stop(struct snd_timer_instance *timeri)
527 {
528 struct snd_timer *timer;
529 unsigned long flags;
530 int err;
531
532 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
533 if (err < 0)
534 return err;
535 timer = timeri->timer;
536 spin_lock_irqsave(&timer->lock, flags);
537 timeri->cticks = timeri->ticks;
538 timeri->pticks = 0;
539 spin_unlock_irqrestore(&timer->lock, flags);
540 return 0;
541 }
542
543 /*
544 * start again.. the tick is kept.
545 */
546 int snd_timer_continue(struct snd_timer_instance *timeri)
547 {
548 struct snd_timer *timer;
549 int result = -EINVAL;
550 unsigned long flags;
551
552 if (timeri == NULL)
553 return result;
554 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
555 return snd_timer_start_slave(timeri);
556 timer = timeri->timer;
557 if (! timer)
558 return -EINVAL;
559 spin_lock_irqsave(&timer->lock, flags);
560 if (!timeri->cticks)
561 timeri->cticks = 1;
562 timeri->pticks = 0;
563 result = snd_timer_start1(timer, timeri, timer->sticks);
564 spin_unlock_irqrestore(&timer->lock, flags);
565 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
566 return result;
567 }
568
569 /*
570 * pause.. remember the ticks left
571 */
572 int snd_timer_pause(struct snd_timer_instance * timeri)
573 {
574 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
575 }
576
577 /*
578 * reschedule the timer
579 *
580 * start pending instances and check the scheduling ticks.
581 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
582 */
583 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
584 {
585 struct snd_timer_instance *ti;
586 unsigned long ticks = ~0UL;
587
588 list_for_each_entry(ti, &timer->active_list_head, active_list) {
589 if (ti->flags & SNDRV_TIMER_IFLG_START) {
590 ti->flags &= ~SNDRV_TIMER_IFLG_START;
591 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
592 timer->running++;
593 }
594 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
595 if (ticks > ti->cticks)
596 ticks = ti->cticks;
597 }
598 }
599 if (ticks == ~0UL) {
600 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
601 return;
602 }
603 if (ticks > timer->hw.ticks)
604 ticks = timer->hw.ticks;
605 if (ticks_left != ticks)
606 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
607 timer->sticks = ticks;
608 }
609
610 /*
611 * timer tasklet
612 *
613 */
614 static void snd_timer_tasklet(unsigned long arg)
615 {
616 struct snd_timer *timer = (struct snd_timer *) arg;
617 struct snd_timer_instance *ti;
618 struct list_head *p;
619 unsigned long resolution, ticks;
620 unsigned long flags;
621
622 spin_lock_irqsave(&timer->lock, flags);
623 /* now process all callbacks */
624 while (!list_empty(&timer->sack_list_head)) {
625 p = timer->sack_list_head.next; /* get first item */
626 ti = list_entry(p, struct snd_timer_instance, ack_list);
627
628 /* remove from ack_list and make empty */
629 list_del_init(p);
630
631 ticks = ti->pticks;
632 ti->pticks = 0;
633 resolution = ti->resolution;
634
635 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
636 spin_unlock(&timer->lock);
637 if (ti->callback)
638 ti->callback(ti, resolution, ticks);
639 spin_lock(&timer->lock);
640 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
641 }
642 spin_unlock_irqrestore(&timer->lock, flags);
643 }
644
645 /*
646 * timer interrupt
647 *
648 * ticks_left is usually equal to timer->sticks.
649 *
650 */
651 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
652 {
653 struct snd_timer_instance *ti, *ts, *tmp;
654 unsigned long resolution, ticks;
655 struct list_head *p, *ack_list_head;
656 unsigned long flags;
657 int use_tasklet = 0;
658
659 if (timer == NULL)
660 return;
661
662 spin_lock_irqsave(&timer->lock, flags);
663
664 /* remember the current resolution */
665 if (timer->hw.c_resolution)
666 resolution = timer->hw.c_resolution(timer);
667 else
668 resolution = timer->hw.resolution;
669
670 /* loop for all active instances
671 * Here we cannot use list_for_each_entry because the active_list of a
672 * processed instance is relinked to done_list_head before the callback
673 * is called.
674 */
675 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
676 active_list) {
677 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
678 continue;
679 ti->pticks += ticks_left;
680 ti->resolution = resolution;
681 if (ti->cticks < ticks_left)
682 ti->cticks = 0;
683 else
684 ti->cticks -= ticks_left;
685 if (ti->cticks) /* not expired */
686 continue;
687 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
688 ti->cticks = ti->ticks;
689 } else {
690 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
691 if (--timer->running)
692 list_del(&ti->active_list);
693 }
694 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
695 (ti->flags & SNDRV_TIMER_IFLG_FAST))
696 ack_list_head = &timer->ack_list_head;
697 else
698 ack_list_head = &timer->sack_list_head;
699 if (list_empty(&ti->ack_list))
700 list_add_tail(&ti->ack_list, ack_list_head);
701 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
702 ts->pticks = ti->pticks;
703 ts->resolution = resolution;
704 if (list_empty(&ts->ack_list))
705 list_add_tail(&ts->ack_list, ack_list_head);
706 }
707 }
708 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
709 snd_timer_reschedule(timer, timer->sticks);
710 if (timer->running) {
711 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
712 timer->hw.stop(timer);
713 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
714 }
715 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
716 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
717 /* restart timer */
718 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
719 timer->hw.start(timer);
720 }
721 } else {
722 timer->hw.stop(timer);
723 }
724
725 /* now process all fast callbacks */
726 while (!list_empty(&timer->ack_list_head)) {
727 p = timer->ack_list_head.next; /* get first item */
728 ti = list_entry(p, struct snd_timer_instance, ack_list);
729
730 /* remove from ack_list and make empty */
731 list_del_init(p);
732
733 ticks = ti->pticks;
734 ti->pticks = 0;
735
736 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
737 spin_unlock(&timer->lock);
738 if (ti->callback)
739 ti->callback(ti, resolution, ticks);
740 spin_lock(&timer->lock);
741 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
742 }
743
744 /* do we have any slow callbacks? */
745 use_tasklet = !list_empty(&timer->sack_list_head);
746 spin_unlock_irqrestore(&timer->lock, flags);
747
748 if (use_tasklet)
749 tasklet_schedule(&timer->task_queue);
750 }
751
752 /*
753
754 */
755
756 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
757 struct snd_timer **rtimer)
758 {
759 struct snd_timer *timer;
760 int err;
761 static struct snd_device_ops ops = {
762 .dev_free = snd_timer_dev_free,
763 .dev_register = snd_timer_dev_register,
764 .dev_disconnect = snd_timer_dev_disconnect,
765 };
766
767 if (snd_BUG_ON(!tid))
768 return -EINVAL;
769 if (rtimer)
770 *rtimer = NULL;
771 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
772 if (timer == NULL) {
773 snd_printk(KERN_ERR "timer: cannot allocate\n");
774 return -ENOMEM;
775 }
776 timer->tmr_class = tid->dev_class;
777 timer->card = card;
778 timer->tmr_device = tid->device;
779 timer->tmr_subdevice = tid->subdevice;
780 if (id)
781 strlcpy(timer->id, id, sizeof(timer->id));
782 INIT_LIST_HEAD(&timer->device_list);
783 INIT_LIST_HEAD(&timer->open_list_head);
784 INIT_LIST_HEAD(&timer->active_list_head);
785 INIT_LIST_HEAD(&timer->ack_list_head);
786 INIT_LIST_HEAD(&timer->sack_list_head);
787 spin_lock_init(&timer->lock);
788 tasklet_init(&timer->task_queue, snd_timer_tasklet,
789 (unsigned long)timer);
790 if (card != NULL) {
791 timer->module = card->module;
792 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
793 if (err < 0) {
794 snd_timer_free(timer);
795 return err;
796 }
797 }
798 if (rtimer)
799 *rtimer = timer;
800 return 0;
801 }
802
803 static int snd_timer_free(struct snd_timer *timer)
804 {
805 if (!timer)
806 return 0;
807
808 mutex_lock(&register_mutex);
809 if (! list_empty(&timer->open_list_head)) {
810 struct list_head *p, *n;
811 struct snd_timer_instance *ti;
812 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
813 list_for_each_safe(p, n, &timer->open_list_head) {
814 list_del_init(p);
815 ti = list_entry(p, struct snd_timer_instance, open_list);
816 ti->timer = NULL;
817 }
818 }
819 list_del(&timer->device_list);
820 mutex_unlock(&register_mutex);
821
822 if (timer->private_free)
823 timer->private_free(timer);
824 kfree(timer);
825 return 0;
826 }
827
828 static int snd_timer_dev_free(struct snd_device *device)
829 {
830 struct snd_timer *timer = device->device_data;
831 return snd_timer_free(timer);
832 }
833
834 static int snd_timer_dev_register(struct snd_device *dev)
835 {
836 struct snd_timer *timer = dev->device_data;
837 struct snd_timer *timer1;
838
839 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
840 return -ENXIO;
841 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
842 !timer->hw.resolution && timer->hw.c_resolution == NULL)
843 return -EINVAL;
844
845 mutex_lock(&register_mutex);
846 list_for_each_entry(timer1, &snd_timer_list, device_list) {
847 if (timer1->tmr_class > timer->tmr_class)
848 break;
849 if (timer1->tmr_class < timer->tmr_class)
850 continue;
851 if (timer1->card && timer->card) {
852 if (timer1->card->number > timer->card->number)
853 break;
854 if (timer1->card->number < timer->card->number)
855 continue;
856 }
857 if (timer1->tmr_device > timer->tmr_device)
858 break;
859 if (timer1->tmr_device < timer->tmr_device)
860 continue;
861 if (timer1->tmr_subdevice > timer->tmr_subdevice)
862 break;
863 if (timer1->tmr_subdevice < timer->tmr_subdevice)
864 continue;
865 /* conflicts.. */
866 mutex_unlock(&register_mutex);
867 return -EBUSY;
868 }
869 list_add_tail(&timer->device_list, &timer1->device_list);
870 mutex_unlock(&register_mutex);
871 return 0;
872 }
873
874 static int snd_timer_dev_disconnect(struct snd_device *device)
875 {
876 struct snd_timer *timer = device->device_data;
877 mutex_lock(&register_mutex);
878 list_del_init(&timer->device_list);
879 mutex_unlock(&register_mutex);
880 return 0;
881 }
882
883 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
884 {
885 unsigned long flags;
886 unsigned long resolution = 0;
887 struct snd_timer_instance *ti, *ts;
888
889 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
890 return;
891 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
892 event > SNDRV_TIMER_EVENT_MRESUME))
893 return;
894 spin_lock_irqsave(&timer->lock, flags);
895 if (event == SNDRV_TIMER_EVENT_MSTART ||
896 event == SNDRV_TIMER_EVENT_MCONTINUE ||
897 event == SNDRV_TIMER_EVENT_MRESUME) {
898 if (timer->hw.c_resolution)
899 resolution = timer->hw.c_resolution(timer);
900 else
901 resolution = timer->hw.resolution;
902 }
903 list_for_each_entry(ti, &timer->active_list_head, active_list) {
904 if (ti->ccallback)
905 ti->ccallback(ti, event, tstamp, resolution);
906 list_for_each_entry(ts, &ti->slave_active_head, active_list)
907 if (ts->ccallback)
908 ts->ccallback(ts, event, tstamp, resolution);
909 }
910 spin_unlock_irqrestore(&timer->lock, flags);
911 }
912
913 /*
914 * exported functions for global timers
915 */
916 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
917 {
918 struct snd_timer_id tid;
919
920 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
921 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
922 tid.card = -1;
923 tid.device = device;
924 tid.subdevice = 0;
925 return snd_timer_new(NULL, id, &tid, rtimer);
926 }
927
928 int snd_timer_global_free(struct snd_timer *timer)
929 {
930 return snd_timer_free(timer);
931 }
932
933 int snd_timer_global_register(struct snd_timer *timer)
934 {
935 struct snd_device dev;
936
937 memset(&dev, 0, sizeof(dev));
938 dev.device_data = timer;
939 return snd_timer_dev_register(&dev);
940 }
941
942 /*
943 * System timer
944 */
945
946 struct snd_timer_system_private {
947 struct timer_list tlist;
948 unsigned long last_expires;
949 unsigned long last_jiffies;
950 unsigned long correction;
951 };
952
953 static void snd_timer_s_function(unsigned long data)
954 {
955 struct snd_timer *timer = (struct snd_timer *)data;
956 struct snd_timer_system_private *priv = timer->private_data;
957 unsigned long jiff = jiffies;
958 if (time_after(jiff, priv->last_expires))
959 priv->correction += (long)jiff - (long)priv->last_expires;
960 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
961 }
962
963 static int snd_timer_s_start(struct snd_timer * timer)
964 {
965 struct snd_timer_system_private *priv;
966 unsigned long njiff;
967
968 priv = (struct snd_timer_system_private *) timer->private_data;
969 njiff = (priv->last_jiffies = jiffies);
970 if (priv->correction > timer->sticks - 1) {
971 priv->correction -= timer->sticks - 1;
972 njiff++;
973 } else {
974 njiff += timer->sticks - priv->correction;
975 priv->correction = 0;
976 }
977 priv->last_expires = priv->tlist.expires = njiff;
978 add_timer(&priv->tlist);
979 return 0;
980 }
981
982 static int snd_timer_s_stop(struct snd_timer * timer)
983 {
984 struct snd_timer_system_private *priv;
985 unsigned long jiff;
986
987 priv = (struct snd_timer_system_private *) timer->private_data;
988 del_timer(&priv->tlist);
989 jiff = jiffies;
990 if (time_before(jiff, priv->last_expires))
991 timer->sticks = priv->last_expires - jiff;
992 else
993 timer->sticks = 1;
994 priv->correction = 0;
995 return 0;
996 }
997
998 static struct snd_timer_hardware snd_timer_system =
999 {
1000 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1001 .resolution = 1000000000L / HZ,
1002 .ticks = 10000000L,
1003 .start = snd_timer_s_start,
1004 .stop = snd_timer_s_stop
1005 };
1006
1007 static void snd_timer_free_system(struct snd_timer *timer)
1008 {
1009 kfree(timer->private_data);
1010 }
1011
1012 static int snd_timer_register_system(void)
1013 {
1014 struct snd_timer *timer;
1015 struct snd_timer_system_private *priv;
1016 int err;
1017
1018 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1019 if (err < 0)
1020 return err;
1021 strcpy(timer->name, "system timer");
1022 timer->hw = snd_timer_system;
1023 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1024 if (priv == NULL) {
1025 snd_timer_free(timer);
1026 return -ENOMEM;
1027 }
1028 init_timer(&priv->tlist);
1029 priv->tlist.function = snd_timer_s_function;
1030 priv->tlist.data = (unsigned long) timer;
1031 timer->private_data = priv;
1032 timer->private_free = snd_timer_free_system;
1033 return snd_timer_global_register(timer);
1034 }
1035
1036 #ifdef CONFIG_PROC_FS
1037 /*
1038 * Info interface
1039 */
1040
1041 static void snd_timer_proc_read(struct snd_info_entry *entry,
1042 struct snd_info_buffer *buffer)
1043 {
1044 struct snd_timer *timer;
1045 struct snd_timer_instance *ti;
1046
1047 mutex_lock(&register_mutex);
1048 list_for_each_entry(timer, &snd_timer_list, device_list) {
1049 switch (timer->tmr_class) {
1050 case SNDRV_TIMER_CLASS_GLOBAL:
1051 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1052 break;
1053 case SNDRV_TIMER_CLASS_CARD:
1054 snd_iprintf(buffer, "C%i-%i: ",
1055 timer->card->number, timer->tmr_device);
1056 break;
1057 case SNDRV_TIMER_CLASS_PCM:
1058 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1059 timer->tmr_device, timer->tmr_subdevice);
1060 break;
1061 default:
1062 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1063 timer->card ? timer->card->number : -1,
1064 timer->tmr_device, timer->tmr_subdevice);
1065 }
1066 snd_iprintf(buffer, "%s :", timer->name);
1067 if (timer->hw.resolution)
1068 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1069 timer->hw.resolution / 1000,
1070 timer->hw.resolution % 1000,
1071 timer->hw.ticks);
1072 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1073 snd_iprintf(buffer, " SLAVE");
1074 snd_iprintf(buffer, "\n");
1075 list_for_each_entry(ti, &timer->open_list_head, open_list)
1076 snd_iprintf(buffer, " Client %s : %s\n",
1077 ti->owner ? ti->owner : "unknown",
1078 ti->flags & (SNDRV_TIMER_IFLG_START |
1079 SNDRV_TIMER_IFLG_RUNNING)
1080 ? "running" : "stopped");
1081 }
1082 mutex_unlock(&register_mutex);
1083 }
1084
1085 static struct snd_info_entry *snd_timer_proc_entry;
1086
1087 static void __init snd_timer_proc_init(void)
1088 {
1089 struct snd_info_entry *entry;
1090
1091 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1092 if (entry != NULL) {
1093 entry->c.text.read = snd_timer_proc_read;
1094 if (snd_info_register(entry) < 0) {
1095 snd_info_free_entry(entry);
1096 entry = NULL;
1097 }
1098 }
1099 snd_timer_proc_entry = entry;
1100 }
1101
1102 static void __exit snd_timer_proc_done(void)
1103 {
1104 snd_info_free_entry(snd_timer_proc_entry);
1105 }
1106 #else /* !CONFIG_PROC_FS */
1107 #define snd_timer_proc_init()
1108 #define snd_timer_proc_done()
1109 #endif
1110
1111 /*
1112 * USER SPACE interface
1113 */
1114
1115 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1116 unsigned long resolution,
1117 unsigned long ticks)
1118 {
1119 struct snd_timer_user *tu = timeri->callback_data;
1120 struct snd_timer_read *r;
1121 int prev;
1122
1123 spin_lock(&tu->qlock);
1124 if (tu->qused > 0) {
1125 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1126 r = &tu->queue[prev];
1127 if (r->resolution == resolution) {
1128 r->ticks += ticks;
1129 goto __wake;
1130 }
1131 }
1132 if (tu->qused >= tu->queue_size) {
1133 tu->overrun++;
1134 } else {
1135 r = &tu->queue[tu->qtail++];
1136 tu->qtail %= tu->queue_size;
1137 r->resolution = resolution;
1138 r->ticks = ticks;
1139 tu->qused++;
1140 }
1141 __wake:
1142 spin_unlock(&tu->qlock);
1143 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1144 wake_up(&tu->qchange_sleep);
1145 }
1146
1147 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1148 struct snd_timer_tread *tread)
1149 {
1150 if (tu->qused >= tu->queue_size) {
1151 tu->overrun++;
1152 } else {
1153 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1154 tu->qtail %= tu->queue_size;
1155 tu->qused++;
1156 }
1157 }
1158
1159 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1160 int event,
1161 struct timespec *tstamp,
1162 unsigned long resolution)
1163 {
1164 struct snd_timer_user *tu = timeri->callback_data;
1165 struct snd_timer_tread r1;
1166 unsigned long flags;
1167
1168 if (event >= SNDRV_TIMER_EVENT_START &&
1169 event <= SNDRV_TIMER_EVENT_PAUSE)
1170 tu->tstamp = *tstamp;
1171 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1172 return;
1173 r1.event = event;
1174 r1.tstamp = *tstamp;
1175 r1.val = resolution;
1176 spin_lock_irqsave(&tu->qlock, flags);
1177 snd_timer_user_append_to_tqueue(tu, &r1);
1178 spin_unlock_irqrestore(&tu->qlock, flags);
1179 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1180 wake_up(&tu->qchange_sleep);
1181 }
1182
1183 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1184 unsigned long resolution,
1185 unsigned long ticks)
1186 {
1187 struct snd_timer_user *tu = timeri->callback_data;
1188 struct snd_timer_tread *r, r1;
1189 struct timespec tstamp;
1190 int prev, append = 0;
1191
1192 memset(&tstamp, 0, sizeof(tstamp));
1193 spin_lock(&tu->qlock);
1194 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1195 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1196 spin_unlock(&tu->qlock);
1197 return;
1198 }
1199 if (tu->last_resolution != resolution || ticks > 0) {
1200 if (timer_tstamp_monotonic)
1201 do_posix_clock_monotonic_gettime(&tstamp);
1202 else
1203 getnstimeofday(&tstamp);
1204 }
1205 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1206 tu->last_resolution != resolution) {
1207 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1208 r1.tstamp = tstamp;
1209 r1.val = resolution;
1210 snd_timer_user_append_to_tqueue(tu, &r1);
1211 tu->last_resolution = resolution;
1212 append++;
1213 }
1214 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1215 goto __wake;
1216 if (ticks == 0)
1217 goto __wake;
1218 if (tu->qused > 0) {
1219 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1220 r = &tu->tqueue[prev];
1221 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1222 r->tstamp = tstamp;
1223 r->val += ticks;
1224 append++;
1225 goto __wake;
1226 }
1227 }
1228 r1.event = SNDRV_TIMER_EVENT_TICK;
1229 r1.tstamp = tstamp;
1230 r1.val = ticks;
1231 snd_timer_user_append_to_tqueue(tu, &r1);
1232 append++;
1233 __wake:
1234 spin_unlock(&tu->qlock);
1235 if (append == 0)
1236 return;
1237 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1238 wake_up(&tu->qchange_sleep);
1239 }
1240
1241 static int snd_timer_user_open(struct inode *inode, struct file *file)
1242 {
1243 struct snd_timer_user *tu;
1244 int err;
1245
1246 err = nonseekable_open(inode, file);
1247 if (err < 0)
1248 return err;
1249
1250 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1251 if (tu == NULL)
1252 return -ENOMEM;
1253 spin_lock_init(&tu->qlock);
1254 init_waitqueue_head(&tu->qchange_sleep);
1255 mutex_init(&tu->tread_sem);
1256 tu->ticks = 1;
1257 tu->queue_size = 128;
1258 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1259 GFP_KERNEL);
1260 if (tu->queue == NULL) {
1261 kfree(tu);
1262 return -ENOMEM;
1263 }
1264 file->private_data = tu;
1265 return 0;
1266 }
1267
1268 static int snd_timer_user_release(struct inode *inode, struct file *file)
1269 {
1270 struct snd_timer_user *tu;
1271
1272 if (file->private_data) {
1273 tu = file->private_data;
1274 file->private_data = NULL;
1275 if (tu->timeri)
1276 snd_timer_close(tu->timeri);
1277 kfree(tu->queue);
1278 kfree(tu->tqueue);
1279 kfree(tu);
1280 }
1281 return 0;
1282 }
1283
1284 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1285 {
1286 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1287 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1288 id->card = -1;
1289 id->device = -1;
1290 id->subdevice = -1;
1291 }
1292
1293 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1294 {
1295 id->dev_class = timer->tmr_class;
1296 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1297 id->card = timer->card ? timer->card->number : -1;
1298 id->device = timer->tmr_device;
1299 id->subdevice = timer->tmr_subdevice;
1300 }
1301
1302 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1303 {
1304 struct snd_timer_id id;
1305 struct snd_timer *timer;
1306 struct list_head *p;
1307
1308 if (copy_from_user(&id, _tid, sizeof(id)))
1309 return -EFAULT;
1310 mutex_lock(&register_mutex);
1311 if (id.dev_class < 0) { /* first item */
1312 if (list_empty(&snd_timer_list))
1313 snd_timer_user_zero_id(&id);
1314 else {
1315 timer = list_entry(snd_timer_list.next,
1316 struct snd_timer, device_list);
1317 snd_timer_user_copy_id(&id, timer);
1318 }
1319 } else {
1320 switch (id.dev_class) {
1321 case SNDRV_TIMER_CLASS_GLOBAL:
1322 id.device = id.device < 0 ? 0 : id.device + 1;
1323 list_for_each(p, &snd_timer_list) {
1324 timer = list_entry(p, struct snd_timer, device_list);
1325 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1326 snd_timer_user_copy_id(&id, timer);
1327 break;
1328 }
1329 if (timer->tmr_device >= id.device) {
1330 snd_timer_user_copy_id(&id, timer);
1331 break;
1332 }
1333 }
1334 if (p == &snd_timer_list)
1335 snd_timer_user_zero_id(&id);
1336 break;
1337 case SNDRV_TIMER_CLASS_CARD:
1338 case SNDRV_TIMER_CLASS_PCM:
1339 if (id.card < 0) {
1340 id.card = 0;
1341 } else {
1342 if (id.card < 0) {
1343 id.card = 0;
1344 } else {
1345 if (id.device < 0) {
1346 id.device = 0;
1347 } else {
1348 if (id.subdevice < 0) {
1349 id.subdevice = 0;
1350 } else {
1351 id.subdevice++;
1352 }
1353 }
1354 }
1355 }
1356 list_for_each(p, &snd_timer_list) {
1357 timer = list_entry(p, struct snd_timer, device_list);
1358 if (timer->tmr_class > id.dev_class) {
1359 snd_timer_user_copy_id(&id, timer);
1360 break;
1361 }
1362 if (timer->tmr_class < id.dev_class)
1363 continue;
1364 if (timer->card->number > id.card) {
1365 snd_timer_user_copy_id(&id, timer);
1366 break;
1367 }
1368 if (timer->card->number < id.card)
1369 continue;
1370 if (timer->tmr_device > id.device) {
1371 snd_timer_user_copy_id(&id, timer);
1372 break;
1373 }
1374 if (timer->tmr_device < id.device)
1375 continue;
1376 if (timer->tmr_subdevice > id.subdevice) {
1377 snd_timer_user_copy_id(&id, timer);
1378 break;
1379 }
1380 if (timer->tmr_subdevice < id.subdevice)
1381 continue;
1382 snd_timer_user_copy_id(&id, timer);
1383 break;
1384 }
1385 if (p == &snd_timer_list)
1386 snd_timer_user_zero_id(&id);
1387 break;
1388 default:
1389 snd_timer_user_zero_id(&id);
1390 }
1391 }
1392 mutex_unlock(&register_mutex);
1393 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1394 return -EFAULT;
1395 return 0;
1396 }
1397
1398 static int snd_timer_user_ginfo(struct file *file,
1399 struct snd_timer_ginfo __user *_ginfo)
1400 {
1401 struct snd_timer_ginfo *ginfo;
1402 struct snd_timer_id tid;
1403 struct snd_timer *t;
1404 struct list_head *p;
1405 int err = 0;
1406
1407 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1408 if (IS_ERR(ginfo))
1409 return PTR_ERR(ginfo);
1410
1411 tid = ginfo->tid;
1412 memset(ginfo, 0, sizeof(*ginfo));
1413 ginfo->tid = tid;
1414 mutex_lock(&register_mutex);
1415 t = snd_timer_find(&tid);
1416 if (t != NULL) {
1417 ginfo->card = t->card ? t->card->number : -1;
1418 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1419 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1420 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1421 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1422 ginfo->resolution = t->hw.resolution;
1423 if (t->hw.resolution_min > 0) {
1424 ginfo->resolution_min = t->hw.resolution_min;
1425 ginfo->resolution_max = t->hw.resolution_max;
1426 }
1427 list_for_each(p, &t->open_list_head) {
1428 ginfo->clients++;
1429 }
1430 } else {
1431 err = -ENODEV;
1432 }
1433 mutex_unlock(&register_mutex);
1434 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1435 err = -EFAULT;
1436 kfree(ginfo);
1437 return err;
1438 }
1439
1440 static int snd_timer_user_gparams(struct file *file,
1441 struct snd_timer_gparams __user *_gparams)
1442 {
1443 struct snd_timer_gparams gparams;
1444 struct snd_timer *t;
1445 int err;
1446
1447 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1448 return -EFAULT;
1449 mutex_lock(&register_mutex);
1450 t = snd_timer_find(&gparams.tid);
1451 if (!t) {
1452 err = -ENODEV;
1453 goto _error;
1454 }
1455 if (!list_empty(&t->open_list_head)) {
1456 err = -EBUSY;
1457 goto _error;
1458 }
1459 if (!t->hw.set_period) {
1460 err = -ENOSYS;
1461 goto _error;
1462 }
1463 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1464 _error:
1465 mutex_unlock(&register_mutex);
1466 return err;
1467 }
1468
1469 static int snd_timer_user_gstatus(struct file *file,
1470 struct snd_timer_gstatus __user *_gstatus)
1471 {
1472 struct snd_timer_gstatus gstatus;
1473 struct snd_timer_id tid;
1474 struct snd_timer *t;
1475 int err = 0;
1476
1477 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1478 return -EFAULT;
1479 tid = gstatus.tid;
1480 memset(&gstatus, 0, sizeof(gstatus));
1481 gstatus.tid = tid;
1482 mutex_lock(&register_mutex);
1483 t = snd_timer_find(&tid);
1484 if (t != NULL) {
1485 if (t->hw.c_resolution)
1486 gstatus.resolution = t->hw.c_resolution(t);
1487 else
1488 gstatus.resolution = t->hw.resolution;
1489 if (t->hw.precise_resolution) {
1490 t->hw.precise_resolution(t, &gstatus.resolution_num,
1491 &gstatus.resolution_den);
1492 } else {
1493 gstatus.resolution_num = gstatus.resolution;
1494 gstatus.resolution_den = 1000000000uL;
1495 }
1496 } else {
1497 err = -ENODEV;
1498 }
1499 mutex_unlock(&register_mutex);
1500 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1501 err = -EFAULT;
1502 return err;
1503 }
1504
1505 static int snd_timer_user_tselect(struct file *file,
1506 struct snd_timer_select __user *_tselect)
1507 {
1508 struct snd_timer_user *tu;
1509 struct snd_timer_select tselect;
1510 char str[32];
1511 int err = 0;
1512
1513 tu = file->private_data;
1514 mutex_lock(&tu->tread_sem);
1515 if (tu->timeri) {
1516 snd_timer_close(tu->timeri);
1517 tu->timeri = NULL;
1518 }
1519 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1520 err = -EFAULT;
1521 goto __err;
1522 }
1523 sprintf(str, "application %i", current->pid);
1524 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1525 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1526 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1527 if (err < 0)
1528 goto __err;
1529
1530 kfree(tu->queue);
1531 tu->queue = NULL;
1532 kfree(tu->tqueue);
1533 tu->tqueue = NULL;
1534 if (tu->tread) {
1535 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1536 GFP_KERNEL);
1537 if (tu->tqueue == NULL)
1538 err = -ENOMEM;
1539 } else {
1540 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1541 GFP_KERNEL);
1542 if (tu->queue == NULL)
1543 err = -ENOMEM;
1544 }
1545
1546 if (err < 0) {
1547 snd_timer_close(tu->timeri);
1548 tu->timeri = NULL;
1549 } else {
1550 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1551 tu->timeri->callback = tu->tread
1552 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1553 tu->timeri->ccallback = snd_timer_user_ccallback;
1554 tu->timeri->callback_data = (void *)tu;
1555 }
1556
1557 __err:
1558 mutex_unlock(&tu->tread_sem);
1559 return err;
1560 }
1561
1562 static int snd_timer_user_info(struct file *file,
1563 struct snd_timer_info __user *_info)
1564 {
1565 struct snd_timer_user *tu;
1566 struct snd_timer_info *info;
1567 struct snd_timer *t;
1568 int err = 0;
1569
1570 tu = file->private_data;
1571 if (!tu->timeri)
1572 return -EBADFD;
1573 t = tu->timeri->timer;
1574 if (!t)
1575 return -EBADFD;
1576
1577 info = kzalloc(sizeof(*info), GFP_KERNEL);
1578 if (! info)
1579 return -ENOMEM;
1580 info->card = t->card ? t->card->number : -1;
1581 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1582 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1583 strlcpy(info->id, t->id, sizeof(info->id));
1584 strlcpy(info->name, t->name, sizeof(info->name));
1585 info->resolution = t->hw.resolution;
1586 if (copy_to_user(_info, info, sizeof(*_info)))
1587 err = -EFAULT;
1588 kfree(info);
1589 return err;
1590 }
1591
1592 static int snd_timer_user_params(struct file *file,
1593 struct snd_timer_params __user *_params)
1594 {
1595 struct snd_timer_user *tu;
1596 struct snd_timer_params params;
1597 struct snd_timer *t;
1598 struct snd_timer_read *tr;
1599 struct snd_timer_tread *ttr;
1600 int err;
1601
1602 tu = file->private_data;
1603 if (!tu->timeri)
1604 return -EBADFD;
1605 t = tu->timeri->timer;
1606 if (!t)
1607 return -EBADFD;
1608 if (copy_from_user(&params, _params, sizeof(params)))
1609 return -EFAULT;
1610 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1611 err = -EINVAL;
1612 goto _end;
1613 }
1614 if (params.queue_size > 0 &&
1615 (params.queue_size < 32 || params.queue_size > 1024)) {
1616 err = -EINVAL;
1617 goto _end;
1618 }
1619 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1620 (1<<SNDRV_TIMER_EVENT_TICK)|
1621 (1<<SNDRV_TIMER_EVENT_START)|
1622 (1<<SNDRV_TIMER_EVENT_STOP)|
1623 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1624 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1625 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1626 (1<<SNDRV_TIMER_EVENT_RESUME)|
1627 (1<<SNDRV_TIMER_EVENT_MSTART)|
1628 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1629 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1630 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1631 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1632 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1633 err = -EINVAL;
1634 goto _end;
1635 }
1636 snd_timer_stop(tu->timeri);
1637 spin_lock_irq(&t->lock);
1638 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1639 SNDRV_TIMER_IFLG_EXCLUSIVE|
1640 SNDRV_TIMER_IFLG_EARLY_EVENT);
1641 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1642 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1643 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1644 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1645 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1646 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1647 spin_unlock_irq(&t->lock);
1648 if (params.queue_size > 0 &&
1649 (unsigned int)tu->queue_size != params.queue_size) {
1650 if (tu->tread) {
1651 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1652 GFP_KERNEL);
1653 if (ttr) {
1654 kfree(tu->tqueue);
1655 tu->queue_size = params.queue_size;
1656 tu->tqueue = ttr;
1657 }
1658 } else {
1659 tr = kmalloc(params.queue_size * sizeof(*tr),
1660 GFP_KERNEL);
1661 if (tr) {
1662 kfree(tu->queue);
1663 tu->queue_size = params.queue_size;
1664 tu->queue = tr;
1665 }
1666 }
1667 }
1668 tu->qhead = tu->qtail = tu->qused = 0;
1669 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1670 if (tu->tread) {
1671 struct snd_timer_tread tread;
1672 tread.event = SNDRV_TIMER_EVENT_EARLY;
1673 tread.tstamp.tv_sec = 0;
1674 tread.tstamp.tv_nsec = 0;
1675 tread.val = 0;
1676 snd_timer_user_append_to_tqueue(tu, &tread);
1677 } else {
1678 struct snd_timer_read *r = &tu->queue[0];
1679 r->resolution = 0;
1680 r->ticks = 0;
1681 tu->qused++;
1682 tu->qtail++;
1683 }
1684 }
1685 tu->filter = params.filter;
1686 tu->ticks = params.ticks;
1687 err = 0;
1688 _end:
1689 if (copy_to_user(_params, &params, sizeof(params)))
1690 return -EFAULT;
1691 return err;
1692 }
1693
1694 static int snd_timer_user_status(struct file *file,
1695 struct snd_timer_status __user *_status)
1696 {
1697 struct snd_timer_user *tu;
1698 struct snd_timer_status status;
1699
1700 tu = file->private_data;
1701 if (!tu->timeri)
1702 return -EBADFD;
1703 memset(&status, 0, sizeof(status));
1704 status.tstamp = tu->tstamp;
1705 status.resolution = snd_timer_resolution(tu->timeri);
1706 status.lost = tu->timeri->lost;
1707 status.overrun = tu->overrun;
1708 spin_lock_irq(&tu->qlock);
1709 status.queue = tu->qused;
1710 spin_unlock_irq(&tu->qlock);
1711 if (copy_to_user(_status, &status, sizeof(status)))
1712 return -EFAULT;
1713 return 0;
1714 }
1715
1716 static int snd_timer_user_start(struct file *file)
1717 {
1718 int err;
1719 struct snd_timer_user *tu;
1720
1721 tu = file->private_data;
1722 if (!tu->timeri)
1723 return -EBADFD;
1724 snd_timer_stop(tu->timeri);
1725 tu->timeri->lost = 0;
1726 tu->last_resolution = 0;
1727 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1728 }
1729
1730 static int snd_timer_user_stop(struct file *file)
1731 {
1732 int err;
1733 struct snd_timer_user *tu;
1734
1735 tu = file->private_data;
1736 if (!tu->timeri)
1737 return -EBADFD;
1738 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1739 }
1740
1741 static int snd_timer_user_continue(struct file *file)
1742 {
1743 int err;
1744 struct snd_timer_user *tu;
1745
1746 tu = file->private_data;
1747 if (!tu->timeri)
1748 return -EBADFD;
1749 tu->timeri->lost = 0;
1750 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1751 }
1752
1753 static int snd_timer_user_pause(struct file *file)
1754 {
1755 int err;
1756 struct snd_timer_user *tu;
1757
1758 tu = file->private_data;
1759 if (!tu->timeri)
1760 return -EBADFD;
1761 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1762 }
1763
1764 enum {
1765 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1766 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1767 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1768 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1769 };
1770
1771 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1772 unsigned long arg)
1773 {
1774 struct snd_timer_user *tu;
1775 void __user *argp = (void __user *)arg;
1776 int __user *p = argp;
1777
1778 tu = file->private_data;
1779 switch (cmd) {
1780 case SNDRV_TIMER_IOCTL_PVERSION:
1781 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1782 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1783 return snd_timer_user_next_device(argp);
1784 case SNDRV_TIMER_IOCTL_TREAD:
1785 {
1786 int xarg;
1787
1788 mutex_lock(&tu->tread_sem);
1789 if (tu->timeri) { /* too late */
1790 mutex_unlock(&tu->tread_sem);
1791 return -EBUSY;
1792 }
1793 if (get_user(xarg, p)) {
1794 mutex_unlock(&tu->tread_sem);
1795 return -EFAULT;
1796 }
1797 tu->tread = xarg ? 1 : 0;
1798 mutex_unlock(&tu->tread_sem);
1799 return 0;
1800 }
1801 case SNDRV_TIMER_IOCTL_GINFO:
1802 return snd_timer_user_ginfo(file, argp);
1803 case SNDRV_TIMER_IOCTL_GPARAMS:
1804 return snd_timer_user_gparams(file, argp);
1805 case SNDRV_TIMER_IOCTL_GSTATUS:
1806 return snd_timer_user_gstatus(file, argp);
1807 case SNDRV_TIMER_IOCTL_SELECT:
1808 return snd_timer_user_tselect(file, argp);
1809 case SNDRV_TIMER_IOCTL_INFO:
1810 return snd_timer_user_info(file, argp);
1811 case SNDRV_TIMER_IOCTL_PARAMS:
1812 return snd_timer_user_params(file, argp);
1813 case SNDRV_TIMER_IOCTL_STATUS:
1814 return snd_timer_user_status(file, argp);
1815 case SNDRV_TIMER_IOCTL_START:
1816 case SNDRV_TIMER_IOCTL_START_OLD:
1817 return snd_timer_user_start(file);
1818 case SNDRV_TIMER_IOCTL_STOP:
1819 case SNDRV_TIMER_IOCTL_STOP_OLD:
1820 return snd_timer_user_stop(file);
1821 case SNDRV_TIMER_IOCTL_CONTINUE:
1822 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1823 return snd_timer_user_continue(file);
1824 case SNDRV_TIMER_IOCTL_PAUSE:
1825 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1826 return snd_timer_user_pause(file);
1827 }
1828 return -ENOTTY;
1829 }
1830
1831 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1832 {
1833 struct snd_timer_user *tu;
1834
1835 tu = file->private_data;
1836 return fasync_helper(fd, file, on, &tu->fasync);
1837 }
1838
1839 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1840 size_t count, loff_t *offset)
1841 {
1842 struct snd_timer_user *tu;
1843 long result = 0, unit;
1844 int err = 0;
1845
1846 tu = file->private_data;
1847 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1848 spin_lock_irq(&tu->qlock);
1849 while ((long)count - result >= unit) {
1850 while (!tu->qused) {
1851 wait_queue_t wait;
1852
1853 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1854 err = -EAGAIN;
1855 break;
1856 }
1857
1858 set_current_state(TASK_INTERRUPTIBLE);
1859 init_waitqueue_entry(&wait, current);
1860 add_wait_queue(&tu->qchange_sleep, &wait);
1861
1862 spin_unlock_irq(&tu->qlock);
1863 schedule();
1864 spin_lock_irq(&tu->qlock);
1865
1866 remove_wait_queue(&tu->qchange_sleep, &wait);
1867
1868 if (signal_pending(current)) {
1869 err = -ERESTARTSYS;
1870 break;
1871 }
1872 }
1873
1874 spin_unlock_irq(&tu->qlock);
1875 if (err < 0)
1876 goto _error;
1877
1878 if (tu->tread) {
1879 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1880 sizeof(struct snd_timer_tread))) {
1881 err = -EFAULT;
1882 goto _error;
1883 }
1884 } else {
1885 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1886 sizeof(struct snd_timer_read))) {
1887 err = -EFAULT;
1888 goto _error;
1889 }
1890 }
1891
1892 tu->qhead %= tu->queue_size;
1893
1894 result += unit;
1895 buffer += unit;
1896
1897 spin_lock_irq(&tu->qlock);
1898 tu->qused--;
1899 }
1900 spin_unlock_irq(&tu->qlock);
1901 _error:
1902 return result > 0 ? result : err;
1903 }
1904
1905 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1906 {
1907 unsigned int mask;
1908 struct snd_timer_user *tu;
1909
1910 tu = file->private_data;
1911
1912 poll_wait(file, &tu->qchange_sleep, wait);
1913
1914 mask = 0;
1915 if (tu->qused)
1916 mask |= POLLIN | POLLRDNORM;
1917
1918 return mask;
1919 }
1920
1921 #ifdef CONFIG_COMPAT
1922 #include "timer_compat.c"
1923 #else
1924 #define snd_timer_user_ioctl_compat NULL
1925 #endif
1926
1927 static const struct file_operations snd_timer_f_ops =
1928 {
1929 .owner = THIS_MODULE,
1930 .read = snd_timer_user_read,
1931 .open = snd_timer_user_open,
1932 .release = snd_timer_user_release,
1933 .llseek = no_llseek,
1934 .poll = snd_timer_user_poll,
1935 .unlocked_ioctl = snd_timer_user_ioctl,
1936 .compat_ioctl = snd_timer_user_ioctl_compat,
1937 .fasync = snd_timer_user_fasync,
1938 };
1939
1940 /*
1941 * ENTRY functions
1942 */
1943
1944 static int __init alsa_timer_init(void)
1945 {
1946 int err;
1947
1948 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1949 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1950 "system timer");
1951 #endif
1952
1953 if ((err = snd_timer_register_system()) < 0)
1954 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1955 err);
1956 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1957 &snd_timer_f_ops, NULL, "timer")) < 0)
1958 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1959 err);
1960 snd_timer_proc_init();
1961 return 0;
1962 }
1963
1964 static void __exit alsa_timer_exit(void)
1965 {
1966 struct list_head *p, *n;
1967
1968 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1969 /* unregister the system timer */
1970 list_for_each_safe(p, n, &snd_timer_list) {
1971 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1972 snd_timer_free(timer);
1973 }
1974 snd_timer_proc_done();
1975 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1976 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1977 #endif
1978 }
1979
1980 module_init(alsa_timer_init)
1981 module_exit(alsa_timer_exit)
1982
1983 EXPORT_SYMBOL(snd_timer_open);
1984 EXPORT_SYMBOL(snd_timer_close);
1985 EXPORT_SYMBOL(snd_timer_resolution);
1986 EXPORT_SYMBOL(snd_timer_start);
1987 EXPORT_SYMBOL(snd_timer_stop);
1988 EXPORT_SYMBOL(snd_timer_continue);
1989 EXPORT_SYMBOL(snd_timer_pause);
1990 EXPORT_SYMBOL(snd_timer_new);
1991 EXPORT_SYMBOL(snd_timer_notify);
1992 EXPORT_SYMBOL(snd_timer_global_new);
1993 EXPORT_SYMBOL(snd_timer_global_free);
1994 EXPORT_SYMBOL(snd_timer_global_register);
1995 EXPORT_SYMBOL(snd_timer_interrupt);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree