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Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / sound / core / timer.c
blob67520b3c0042d6f08178a8ed9c9d4fdfb5f25289
1 /*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <sound/driver.h>
23 #include <linux/delay.h>
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/mutex.h>
28 #include <linux/moduleparam.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_HPET) || defined(CONFIG_SND_HPET_MODULE)
39 #define DEFAULT_TIMER_LIMIT 3
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 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.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
53 struct snd_timer_user {
54 struct snd_timer_instance *timeri;
55 int tread; /* enhanced read with timestamps and events */
56 unsigned long ticks;
57 unsigned long overrun;
58 int qhead;
59 int qtail;
60 int qused;
61 int queue_size;
62 struct snd_timer_read *queue;
63 struct snd_timer_tread *tqueue;
64 spinlock_t qlock;
65 unsigned long last_resolution;
66 unsigned int filter;
67 struct timespec tstamp; /* trigger tstamp */
68 wait_queue_head_t qchange_sleep;
69 struct fasync_struct *fasync;
70 struct mutex tread_sem;
71 };
72
73 /* list of timers */
74 static LIST_HEAD(snd_timer_list);
75
76 /* list of slave instances */
77 static LIST_HEAD(snd_timer_slave_list);
78
79 /* lock for slave active lists */
80 static DEFINE_SPINLOCK(slave_active_lock);
81
82 static DEFINE_MUTEX(register_mutex);
83
84 static int snd_timer_free(struct snd_timer *timer);
85 static int snd_timer_dev_free(struct snd_device *device);
86 static int snd_timer_dev_register(struct snd_device *device);
87 static int snd_timer_dev_disconnect(struct snd_device *device);
88
89 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
90
91 /*
92 * create a timer instance with the given owner string.
93 * when timer is not NULL, increments the module counter
94 */
95 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
96 struct snd_timer *timer)
97 {
98 struct snd_timer_instance *timeri;
99 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
100 if (timeri == NULL)
101 return NULL;
102 timeri->owner = kstrdup(owner, GFP_KERNEL);
103 if (! timeri->owner) {
104 kfree(timeri);
105 return NULL;
106 }
107 INIT_LIST_HEAD(&timeri->open_list);
108 INIT_LIST_HEAD(&timeri->active_list);
109 INIT_LIST_HEAD(&timeri->ack_list);
110 INIT_LIST_HEAD(&timeri->slave_list_head);
111 INIT_LIST_HEAD(&timeri->slave_active_head);
112
113 timeri->timer = timer;
114 if (timer && !try_module_get(timer->module)) {
115 kfree(timeri->owner);
116 kfree(timeri);
117 return NULL;
118 }
119
120 return timeri;
121 }
122
123 /*
124 * find a timer instance from the given timer id
125 */
126 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
127 {
128 struct snd_timer *timer = NULL;
129
130 list_for_each_entry(timer, &snd_timer_list, device_list) {
131 if (timer->tmr_class != tid->dev_class)
132 continue;
133 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
134 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
135 (timer->card == NULL ||
136 timer->card->number != tid->card))
137 continue;
138 if (timer->tmr_device != tid->device)
139 continue;
140 if (timer->tmr_subdevice != tid->subdevice)
141 continue;
142 return timer;
143 }
144 return NULL;
145 }
146
147 #ifdef CONFIG_KMOD
148
149 static void snd_timer_request(struct snd_timer_id *tid)
150 {
151 if (! current->fs->root)
152 return;
153 switch (tid->dev_class) {
154 case SNDRV_TIMER_CLASS_GLOBAL:
155 if (tid->device < timer_limit)
156 request_module("snd-timer-%i", tid->device);
157 break;
158 case SNDRV_TIMER_CLASS_CARD:
159 case SNDRV_TIMER_CLASS_PCM:
160 if (tid->card < snd_ecards_limit)
161 request_module("snd-card-%i", tid->card);
162 break;
163 default:
164 break;
165 }
166 }
167
168 #endif
169
170 /*
171 * look for a master instance matching with the slave id of the given slave.
172 * when found, relink the open_link of the slave.
173 *
174 * call this with register_mutex down.
175 */
176 static void snd_timer_check_slave(struct snd_timer_instance *slave)
177 {
178 struct snd_timer *timer;
179 struct snd_timer_instance *master;
180
181 /* FIXME: it's really dumb to look up all entries.. */
182 list_for_each_entry(timer, &snd_timer_list, device_list) {
183 list_for_each_entry(master, &timer->open_list_head, open_list) {
184 if (slave->slave_class == master->slave_class &&
185 slave->slave_id == master->slave_id) {
186 list_del(&slave->open_list);
187 list_add_tail(&slave->open_list,
188 &master->slave_list_head);
189 spin_lock_irq(&slave_active_lock);
190 slave->master = master;
191 slave->timer = master->timer;
192 spin_unlock_irq(&slave_active_lock);
193 return;
194 }
195 }
196 }
197 }
198
199 /*
200 * look for slave instances matching with the slave id of the given master.
201 * when found, relink the open_link of slaves.
202 *
203 * call this with register_mutex down.
204 */
205 static void snd_timer_check_master(struct snd_timer_instance *master)
206 {
207 struct snd_timer_instance *slave, *tmp;
208
209 /* check all pending slaves */
210 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
211 if (slave->slave_class == master->slave_class &&
212 slave->slave_id == master->slave_id) {
213 list_move_tail(&slave->open_list, &master->slave_list_head);
214 spin_lock_irq(&slave_active_lock);
215 slave->master = master;
216 slave->timer = master->timer;
217 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
218 list_add_tail(&slave->active_list,
219 &master->slave_active_head);
220 spin_unlock_irq(&slave_active_lock);
221 }
222 }
223 }
224
225 /*
226 * open a timer instance
227 * when opening a master, the slave id must be here given.
228 */
229 int snd_timer_open(struct snd_timer_instance **ti,
230 char *owner, struct snd_timer_id *tid,
231 unsigned int slave_id)
232 {
233 struct snd_timer *timer;
234 struct snd_timer_instance *timeri = NULL;
235
236 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
237 /* open a slave instance */
238 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
239 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
240 snd_printd("invalid slave class %i\n", tid->dev_sclass);
241 return -EINVAL;
242 }
243 mutex_lock(&register_mutex);
244 timeri = snd_timer_instance_new(owner, NULL);
245 if (!timeri) {
246 mutex_unlock(&register_mutex);
247 return -ENOMEM;
248 }
249 timeri->slave_class = tid->dev_sclass;
250 timeri->slave_id = tid->device;
251 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
252 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
253 snd_timer_check_slave(timeri);
254 mutex_unlock(&register_mutex);
255 *ti = timeri;
256 return 0;
257 }
258
259 /* open a master instance */
260 mutex_lock(&register_mutex);
261 timer = snd_timer_find(tid);
262 #ifdef CONFIG_KMOD
263 if (timer == NULL) {
264 mutex_unlock(&register_mutex);
265 snd_timer_request(tid);
266 mutex_lock(&register_mutex);
267 timer = snd_timer_find(tid);
268 }
269 #endif
270 if (!timer) {
271 mutex_unlock(&register_mutex);
272 return -ENODEV;
273 }
274 if (!list_empty(&timer->open_list_head)) {
275 timeri = list_entry(timer->open_list_head.next,
276 struct snd_timer_instance, open_list);
277 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
278 mutex_unlock(&register_mutex);
279 return -EBUSY;
280 }
281 }
282 timeri = snd_timer_instance_new(owner, timer);
283 if (!timeri) {
284 mutex_unlock(&register_mutex);
285 return -ENOMEM;
286 }
287 timeri->slave_class = tid->dev_sclass;
288 timeri->slave_id = slave_id;
289 if (list_empty(&timer->open_list_head) && timer->hw.open)
290 timer->hw.open(timer);
291 list_add_tail(&timeri->open_list, &timer->open_list_head);
292 snd_timer_check_master(timeri);
293 mutex_unlock(&register_mutex);
294 *ti = timeri;
295 return 0;
296 }
297
298 static int _snd_timer_stop(struct snd_timer_instance *timeri,
299 int keep_flag, int event);
300
301 /*
302 * close a timer instance
303 */
304 int snd_timer_close(struct snd_timer_instance *timeri)
305 {
306 struct snd_timer *timer = NULL;
307 struct snd_timer_instance *slave, *tmp;
308
309 snd_assert(timeri != NULL, return -ENXIO);
310
311 /* force to stop the timer */
312 snd_timer_stop(timeri);
313
314 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
315 /* wait, until the active callback is finished */
316 spin_lock_irq(&slave_active_lock);
317 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
318 spin_unlock_irq(&slave_active_lock);
319 udelay(10);
320 spin_lock_irq(&slave_active_lock);
321 }
322 spin_unlock_irq(&slave_active_lock);
323 mutex_lock(&register_mutex);
324 list_del(&timeri->open_list);
325 mutex_unlock(&register_mutex);
326 } else {
327 timer = timeri->timer;
328 /* wait, until the active callback is finished */
329 spin_lock_irq(&timer->lock);
330 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
331 spin_unlock_irq(&timer->lock);
332 udelay(10);
333 spin_lock_irq(&timer->lock);
334 }
335 spin_unlock_irq(&timer->lock);
336 mutex_lock(&register_mutex);
337 list_del(&timeri->open_list);
338 if (timer && list_empty(&timer->open_list_head) &&
339 timer->hw.close)
340 timer->hw.close(timer);
341 /* remove slave links */
342 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
343 open_list) {
344 spin_lock_irq(&slave_active_lock);
345 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
346 list_move_tail(&slave->open_list, &snd_timer_slave_list);
347 slave->master = NULL;
348 slave->timer = NULL;
349 spin_unlock_irq(&slave_active_lock);
350 }
351 mutex_unlock(&register_mutex);
352 }
353 if (timeri->private_free)
354 timeri->private_free(timeri);
355 kfree(timeri->owner);
356 kfree(timeri);
357 if (timer)
358 module_put(timer->module);
359 return 0;
360 }
361
362 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
363 {
364 struct snd_timer * timer;
365
366 if (timeri == NULL)
367 return 0;
368 if ((timer = timeri->timer) != NULL) {
369 if (timer->hw.c_resolution)
370 return timer->hw.c_resolution(timer);
371 return timer->hw.resolution;
372 }
373 return 0;
374 }
375
376 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
377 {
378 struct snd_timer *timer;
379 unsigned long flags;
380 unsigned long resolution = 0;
381 struct snd_timer_instance *ts;
382 struct timespec tstamp;
383
384 getnstimeofday(&tstamp);
385 snd_assert(event >= SNDRV_TIMER_EVENT_START &&
386 event <= SNDRV_TIMER_EVENT_PAUSE, return);
387 if (event == SNDRV_TIMER_EVENT_START ||
388 event == SNDRV_TIMER_EVENT_CONTINUE)
389 resolution = snd_timer_resolution(ti);
390 if (ti->ccallback)
391 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
392 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
393 return;
394 timer = ti->timer;
395 if (timer == NULL)
396 return;
397 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
398 return;
399 spin_lock_irqsave(&timer->lock, flags);
400 list_for_each_entry(ts, &ti->slave_active_head, active_list)
401 if (ts->ccallback)
402 ts->ccallback(ti, event + 100, &tstamp, resolution);
403 spin_unlock_irqrestore(&timer->lock, flags);
404 }
405
406 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
407 unsigned long sticks)
408 {
409 list_del(&timeri->active_list);
410 list_add_tail(&timeri->active_list, &timer->active_list_head);
411 if (timer->running) {
412 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
413 goto __start_now;
414 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
415 timeri->flags |= SNDRV_TIMER_IFLG_START;
416 return 1; /* delayed start */
417 } else {
418 timer->sticks = sticks;
419 timer->hw.start(timer);
420 __start_now:
421 timer->running++;
422 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
423 return 0;
424 }
425 }
426
427 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
428 {
429 unsigned long flags;
430
431 spin_lock_irqsave(&slave_active_lock, flags);
432 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
433 if (timeri->master)
434 list_add_tail(&timeri->active_list,
435 &timeri->master->slave_active_head);
436 spin_unlock_irqrestore(&slave_active_lock, flags);
437 return 1; /* delayed start */
438 }
439
440 /*
441 * start the timer instance
442 */
443 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
444 {
445 struct snd_timer *timer;
446 int result = -EINVAL;
447 unsigned long flags;
448
449 if (timeri == NULL || ticks < 1)
450 return -EINVAL;
451 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
452 result = snd_timer_start_slave(timeri);
453 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
454 return result;
455 }
456 timer = timeri->timer;
457 if (timer == NULL)
458 return -EINVAL;
459 spin_lock_irqsave(&timer->lock, flags);
460 timeri->ticks = timeri->cticks = ticks;
461 timeri->pticks = 0;
462 result = snd_timer_start1(timer, timeri, ticks);
463 spin_unlock_irqrestore(&timer->lock, flags);
464 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
465 return result;
466 }
467
468 static int _snd_timer_stop(struct snd_timer_instance * timeri,
469 int keep_flag, int event)
470 {
471 struct snd_timer *timer;
472 unsigned long flags;
473
474 snd_assert(timeri != NULL, return -ENXIO);
475
476 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
477 if (!keep_flag) {
478 spin_lock_irqsave(&slave_active_lock, flags);
479 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
480 spin_unlock_irqrestore(&slave_active_lock, flags);
481 }
482 goto __end;
483 }
484 timer = timeri->timer;
485 if (!timer)
486 return -EINVAL;
487 spin_lock_irqsave(&timer->lock, flags);
488 list_del_init(&timeri->ack_list);
489 list_del_init(&timeri->active_list);
490 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
491 !(--timer->running)) {
492 timer->hw.stop(timer);
493 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
494 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
495 snd_timer_reschedule(timer, 0);
496 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
497 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
498 timer->hw.start(timer);
499 }
500 }
501 }
502 if (!keep_flag)
503 timeri->flags &=
504 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
505 spin_unlock_irqrestore(&timer->lock, flags);
506 __end:
507 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
508 snd_timer_notify1(timeri, event);
509 return 0;
510 }
511
512 /*
513 * stop the timer instance.
514 *
515 * do not call this from the timer callback!
516 */
517 int snd_timer_stop(struct snd_timer_instance *timeri)
518 {
519 struct snd_timer *timer;
520 unsigned long flags;
521 int err;
522
523 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
524 if (err < 0)
525 return err;
526 timer = timeri->timer;
527 spin_lock_irqsave(&timer->lock, flags);
528 timeri->cticks = timeri->ticks;
529 timeri->pticks = 0;
530 spin_unlock_irqrestore(&timer->lock, flags);
531 return 0;
532 }
533
534 /*
535 * start again.. the tick is kept.
536 */
537 int snd_timer_continue(struct snd_timer_instance *timeri)
538 {
539 struct snd_timer *timer;
540 int result = -EINVAL;
541 unsigned long flags;
542
543 if (timeri == NULL)
544 return result;
545 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
546 return snd_timer_start_slave(timeri);
547 timer = timeri->timer;
548 if (! timer)
549 return -EINVAL;
550 spin_lock_irqsave(&timer->lock, flags);
551 if (!timeri->cticks)
552 timeri->cticks = 1;
553 timeri->pticks = 0;
554 result = snd_timer_start1(timer, timeri, timer->sticks);
555 spin_unlock_irqrestore(&timer->lock, flags);
556 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
557 return result;
558 }
559
560 /*
561 * pause.. remember the ticks left
562 */
563 int snd_timer_pause(struct snd_timer_instance * timeri)
564 {
565 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
566 }
567
568 /*
569 * reschedule the timer
570 *
571 * start pending instances and check the scheduling ticks.
572 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
573 */
574 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
575 {
576 struct snd_timer_instance *ti;
577 unsigned long ticks = ~0UL;
578
579 list_for_each_entry(ti, &timer->active_list_head, active_list) {
580 if (ti->flags & SNDRV_TIMER_IFLG_START) {
581 ti->flags &= ~SNDRV_TIMER_IFLG_START;
582 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
583 timer->running++;
584 }
585 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
586 if (ticks > ti->cticks)
587 ticks = ti->cticks;
588 }
589 }
590 if (ticks == ~0UL) {
591 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
592 return;
593 }
594 if (ticks > timer->hw.ticks)
595 ticks = timer->hw.ticks;
596 if (ticks_left != ticks)
597 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
598 timer->sticks = ticks;
599 }
600
601 /*
602 * timer tasklet
603 *
604 */
605 static void snd_timer_tasklet(unsigned long arg)
606 {
607 struct snd_timer *timer = (struct snd_timer *) arg;
608 struct snd_timer_instance *ti;
609 struct list_head *p;
610 unsigned long resolution, ticks;
611 unsigned long flags;
612
613 spin_lock_irqsave(&timer->lock, flags);
614 /* now process all callbacks */
615 while (!list_empty(&timer->sack_list_head)) {
616 p = timer->sack_list_head.next; /* get first item */
617 ti = list_entry(p, struct snd_timer_instance, ack_list);
618
619 /* remove from ack_list and make empty */
620 list_del_init(p);
621
622 ticks = ti->pticks;
623 ti->pticks = 0;
624 resolution = ti->resolution;
625
626 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
627 spin_unlock(&timer->lock);
628 if (ti->callback)
629 ti->callback(ti, resolution, ticks);
630 spin_lock(&timer->lock);
631 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
632 }
633 spin_unlock_irqrestore(&timer->lock, flags);
634 }
635
636 /*
637 * timer interrupt
638 *
639 * ticks_left is usually equal to timer->sticks.
640 *
641 */
642 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
643 {
644 struct snd_timer_instance *ti, *ts, *tmp;
645 unsigned long resolution, ticks;
646 struct list_head *p, *ack_list_head;
647 unsigned long flags;
648 int use_tasklet = 0;
649
650 if (timer == NULL)
651 return;
652
653 spin_lock_irqsave(&timer->lock, flags);
654
655 /* remember the current resolution */
656 if (timer->hw.c_resolution)
657 resolution = timer->hw.c_resolution(timer);
658 else
659 resolution = timer->hw.resolution;
660
661 /* loop for all active instances
662 * Here we cannot use list_for_each_entry because the active_list of a
663 * processed instance is relinked to done_list_head before the callback
664 * is called.
665 */
666 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
667 active_list) {
668 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
669 continue;
670 ti->pticks += ticks_left;
671 ti->resolution = resolution;
672 if (ti->cticks < ticks_left)
673 ti->cticks = 0;
674 else
675 ti->cticks -= ticks_left;
676 if (ti->cticks) /* not expired */
677 continue;
678 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
679 ti->cticks = ti->ticks;
680 } else {
681 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
682 if (--timer->running)
683 list_del(&ti->active_list);
684 }
685 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
686 (ti->flags & SNDRV_TIMER_IFLG_FAST))
687 ack_list_head = &timer->ack_list_head;
688 else
689 ack_list_head = &timer->sack_list_head;
690 if (list_empty(&ti->ack_list))
691 list_add_tail(&ti->ack_list, ack_list_head);
692 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
693 ts->pticks = ti->pticks;
694 ts->resolution = resolution;
695 if (list_empty(&ts->ack_list))
696 list_add_tail(&ts->ack_list, ack_list_head);
697 }
698 }
699 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
700 snd_timer_reschedule(timer, timer->sticks);
701 if (timer->running) {
702 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
703 timer->hw.stop(timer);
704 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
705 }
706 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
707 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
708 /* restart timer */
709 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
710 timer->hw.start(timer);
711 }
712 } else {
713 timer->hw.stop(timer);
714 }
715
716 /* now process all fast callbacks */
717 while (!list_empty(&timer->ack_list_head)) {
718 p = timer->ack_list_head.next; /* get first item */
719 ti = list_entry(p, struct snd_timer_instance, ack_list);
720
721 /* remove from ack_list and make empty */
722 list_del_init(p);
723
724 ticks = ti->pticks;
725 ti->pticks = 0;
726
727 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
728 spin_unlock(&timer->lock);
729 if (ti->callback)
730 ti->callback(ti, resolution, ticks);
731 spin_lock(&timer->lock);
732 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
733 }
734
735 /* do we have any slow callbacks? */
736 use_tasklet = !list_empty(&timer->sack_list_head);
737 spin_unlock_irqrestore(&timer->lock, flags);
738
739 if (use_tasklet)
740 tasklet_hi_schedule(&timer->task_queue);
741 }
742
743 /*
744
745 */
746
747 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
748 struct snd_timer **rtimer)
749 {
750 struct snd_timer *timer;
751 int err;
752 static struct snd_device_ops ops = {
753 .dev_free = snd_timer_dev_free,
754 .dev_register = snd_timer_dev_register,
755 .dev_disconnect = snd_timer_dev_disconnect,
756 };
757
758 snd_assert(tid != NULL, return -EINVAL);
759 snd_assert(rtimer != NULL, return -EINVAL);
760 *rtimer = NULL;
761 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
762 if (timer == NULL) {
763 snd_printk(KERN_ERR "timer: cannot allocate\n");
764 return -ENOMEM;
765 }
766 timer->tmr_class = tid->dev_class;
767 timer->card = card;
768 timer->tmr_device = tid->device;
769 timer->tmr_subdevice = tid->subdevice;
770 if (id)
771 strlcpy(timer->id, id, sizeof(timer->id));
772 INIT_LIST_HEAD(&timer->device_list);
773 INIT_LIST_HEAD(&timer->open_list_head);
774 INIT_LIST_HEAD(&timer->active_list_head);
775 INIT_LIST_HEAD(&timer->ack_list_head);
776 INIT_LIST_HEAD(&timer->sack_list_head);
777 spin_lock_init(&timer->lock);
778 tasklet_init(&timer->task_queue, snd_timer_tasklet,
779 (unsigned long)timer);
780 if (card != NULL) {
781 timer->module = card->module;
782 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
783 if (err < 0) {
784 snd_timer_free(timer);
785 return err;
786 }
787 }
788 *rtimer = timer;
789 return 0;
790 }
791
792 static int snd_timer_free(struct snd_timer *timer)
793 {
794 snd_assert(timer != NULL, return -ENXIO);
795
796 mutex_lock(&register_mutex);
797 if (! list_empty(&timer->open_list_head)) {
798 struct list_head *p, *n;
799 struct snd_timer_instance *ti;
800 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
801 list_for_each_safe(p, n, &timer->open_list_head) {
802 list_del_init(p);
803 ti = list_entry(p, struct snd_timer_instance, open_list);
804 ti->timer = NULL;
805 }
806 }
807 list_del(&timer->device_list);
808 mutex_unlock(&register_mutex);
809
810 if (timer->private_free)
811 timer->private_free(timer);
812 kfree(timer);
813 return 0;
814 }
815
816 static int snd_timer_dev_free(struct snd_device *device)
817 {
818 struct snd_timer *timer = device->device_data;
819 return snd_timer_free(timer);
820 }
821
822 static int snd_timer_dev_register(struct snd_device *dev)
823 {
824 struct snd_timer *timer = dev->device_data;
825 struct snd_timer *timer1;
826
827 snd_assert(timer != NULL && timer->hw.start != NULL &&
828 timer->hw.stop != NULL, return -ENXIO);
829 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
830 !timer->hw.resolution && timer->hw.c_resolution == NULL)
831 return -EINVAL;
832
833 mutex_lock(&register_mutex);
834 list_for_each_entry(timer1, &snd_timer_list, device_list) {
835 if (timer1->tmr_class > timer->tmr_class)
836 break;
837 if (timer1->tmr_class < timer->tmr_class)
838 continue;
839 if (timer1->card && timer->card) {
840 if (timer1->card->number > timer->card->number)
841 break;
842 if (timer1->card->number < timer->card->number)
843 continue;
844 }
845 if (timer1->tmr_device > timer->tmr_device)
846 break;
847 if (timer1->tmr_device < timer->tmr_device)
848 continue;
849 if (timer1->tmr_subdevice > timer->tmr_subdevice)
850 break;
851 if (timer1->tmr_subdevice < timer->tmr_subdevice)
852 continue;
853 /* conflicts.. */
854 mutex_unlock(&register_mutex);
855 return -EBUSY;
856 }
857 list_add_tail(&timer->device_list, &timer1->device_list);
858 mutex_unlock(&register_mutex);
859 return 0;
860 }
861
862 static int snd_timer_dev_disconnect(struct snd_device *device)
863 {
864 struct snd_timer *timer = device->device_data;
865 mutex_lock(&register_mutex);
866 list_del_init(&timer->device_list);
867 mutex_unlock(&register_mutex);
868 return 0;
869 }
870
871 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
872 {
873 unsigned long flags;
874 unsigned long resolution = 0;
875 struct snd_timer_instance *ti, *ts;
876
877 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
878 return;
879 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART &&
880 event <= SNDRV_TIMER_EVENT_MRESUME, return);
881 spin_lock_irqsave(&timer->lock, flags);
882 if (event == SNDRV_TIMER_EVENT_MSTART ||
883 event == SNDRV_TIMER_EVENT_MCONTINUE ||
884 event == SNDRV_TIMER_EVENT_MRESUME) {
885 if (timer->hw.c_resolution)
886 resolution = timer->hw.c_resolution(timer);
887 else
888 resolution = timer->hw.resolution;
889 }
890 list_for_each_entry(ti, &timer->active_list_head, active_list) {
891 if (ti->ccallback)
892 ti->ccallback(ti, event, tstamp, resolution);
893 list_for_each_entry(ts, &ti->slave_active_head, active_list)
894 if (ts->ccallback)
895 ts->ccallback(ts, event, tstamp, resolution);
896 }
897 spin_unlock_irqrestore(&timer->lock, flags);
898 }
899
900 /*
901 * exported functions for global timers
902 */
903 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
904 {
905 struct snd_timer_id tid;
906
907 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
908 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
909 tid.card = -1;
910 tid.device = device;
911 tid.subdevice = 0;
912 return snd_timer_new(NULL, id, &tid, rtimer);
913 }
914
915 int snd_timer_global_free(struct snd_timer *timer)
916 {
917 return snd_timer_free(timer);
918 }
919
920 int snd_timer_global_register(struct snd_timer *timer)
921 {
922 struct snd_device dev;
923
924 memset(&dev, 0, sizeof(dev));
925 dev.device_data = timer;
926 return snd_timer_dev_register(&dev);
927 }
928
929 /*
930 * System timer
931 */
932
933 struct snd_timer_system_private {
934 struct timer_list tlist;
935 unsigned long last_expires;
936 unsigned long last_jiffies;
937 unsigned long correction;
938 };
939
940 static void snd_timer_s_function(unsigned long data)
941 {
942 struct snd_timer *timer = (struct snd_timer *)data;
943 struct snd_timer_system_private *priv = timer->private_data;
944 unsigned long jiff = jiffies;
945 if (time_after(jiff, priv->last_expires))
946 priv->correction += (long)jiff - (long)priv->last_expires;
947 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
948 }
949
950 static int snd_timer_s_start(struct snd_timer * timer)
951 {
952 struct snd_timer_system_private *priv;
953 unsigned long njiff;
954
955 priv = (struct snd_timer_system_private *) timer->private_data;
956 njiff = (priv->last_jiffies = jiffies);
957 if (priv->correction > timer->sticks - 1) {
958 priv->correction -= timer->sticks - 1;
959 njiff++;
960 } else {
961 njiff += timer->sticks - priv->correction;
962 priv->correction = 0;
963 }
964 priv->last_expires = priv->tlist.expires = njiff;
965 add_timer(&priv->tlist);
966 return 0;
967 }
968
969 static int snd_timer_s_stop(struct snd_timer * timer)
970 {
971 struct snd_timer_system_private *priv;
972 unsigned long jiff;
973
974 priv = (struct snd_timer_system_private *) timer->private_data;
975 del_timer(&priv->tlist);
976 jiff = jiffies;
977 if (time_before(jiff, priv->last_expires))
978 timer->sticks = priv->last_expires - jiff;
979 else
980 timer->sticks = 1;
981 priv->correction = 0;
982 return 0;
983 }
984
985 static struct snd_timer_hardware snd_timer_system =
986 {
987 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
988 .resolution = 1000000000L / HZ,
989 .ticks = 10000000L,
990 .start = snd_timer_s_start,
991 .stop = snd_timer_s_stop
992 };
993
994 static void snd_timer_free_system(struct snd_timer *timer)
995 {
996 kfree(timer->private_data);
997 }
998
999 static int snd_timer_register_system(void)
1000 {
1001 struct snd_timer *timer;
1002 struct snd_timer_system_private *priv;
1003 int err;
1004
1005 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1006 if (err < 0)
1007 return err;
1008 strcpy(timer->name, "system timer");
1009 timer->hw = snd_timer_system;
1010 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1011 if (priv == NULL) {
1012 snd_timer_free(timer);
1013 return -ENOMEM;
1014 }
1015 init_timer(&priv->tlist);
1016 priv->tlist.function = snd_timer_s_function;
1017 priv->tlist.data = (unsigned long) timer;
1018 timer->private_data = priv;
1019 timer->private_free = snd_timer_free_system;
1020 return snd_timer_global_register(timer);
1021 }
1022
1023 #ifdef CONFIG_PROC_FS
1024 /*
1025 * Info interface
1026 */
1027
1028 static void snd_timer_proc_read(struct snd_info_entry *entry,
1029 struct snd_info_buffer *buffer)
1030 {
1031 struct snd_timer *timer;
1032 struct snd_timer_instance *ti;
1033
1034 mutex_lock(&register_mutex);
1035 list_for_each_entry(timer, &snd_timer_list, device_list) {
1036 switch (timer->tmr_class) {
1037 case SNDRV_TIMER_CLASS_GLOBAL:
1038 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1039 break;
1040 case SNDRV_TIMER_CLASS_CARD:
1041 snd_iprintf(buffer, "C%i-%i: ",
1042 timer->card->number, timer->tmr_device);
1043 break;
1044 case SNDRV_TIMER_CLASS_PCM:
1045 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1046 timer->tmr_device, timer->tmr_subdevice);
1047 break;
1048 default:
1049 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1050 timer->card ? timer->card->number : -1,
1051 timer->tmr_device, timer->tmr_subdevice);
1052 }
1053 snd_iprintf(buffer, "%s :", timer->name);
1054 if (timer->hw.resolution)
1055 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1056 timer->hw.resolution / 1000,
1057 timer->hw.resolution % 1000,
1058 timer->hw.ticks);
1059 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1060 snd_iprintf(buffer, " SLAVE");
1061 snd_iprintf(buffer, "\n");
1062 list_for_each_entry(ti, &timer->open_list_head, open_list)
1063 snd_iprintf(buffer, " Client %s : %s\n",
1064 ti->owner ? ti->owner : "unknown",
1065 ti->flags & (SNDRV_TIMER_IFLG_START |
1066 SNDRV_TIMER_IFLG_RUNNING)
1067 ? "running" : "stopped");
1068 }
1069 mutex_unlock(&register_mutex);
1070 }
1071
1072 static struct snd_info_entry *snd_timer_proc_entry;
1073
1074 static void __init snd_timer_proc_init(void)
1075 {
1076 struct snd_info_entry *entry;
1077
1078 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1079 if (entry != NULL) {
1080 entry->c.text.read = snd_timer_proc_read;
1081 if (snd_info_register(entry) < 0) {
1082 snd_info_free_entry(entry);
1083 entry = NULL;
1084 }
1085 }
1086 snd_timer_proc_entry = entry;
1087 }
1088
1089 static void __exit snd_timer_proc_done(void)
1090 {
1091 snd_info_free_entry(snd_timer_proc_entry);
1092 }
1093 #else /* !CONFIG_PROC_FS */
1094 #define snd_timer_proc_init()
1095 #define snd_timer_proc_done()
1096 #endif
1097
1098 /*
1099 * USER SPACE interface
1100 */
1101
1102 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1103 unsigned long resolution,
1104 unsigned long ticks)
1105 {
1106 struct snd_timer_user *tu = timeri->callback_data;
1107 struct snd_timer_read *r;
1108 int prev;
1109
1110 spin_lock(&tu->qlock);
1111 if (tu->qused > 0) {
1112 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1113 r = &tu->queue[prev];
1114 if (r->resolution == resolution) {
1115 r->ticks += ticks;
1116 goto __wake;
1117 }
1118 }
1119 if (tu->qused >= tu->queue_size) {
1120 tu->overrun++;
1121 } else {
1122 r = &tu->queue[tu->qtail++];
1123 tu->qtail %= tu->queue_size;
1124 r->resolution = resolution;
1125 r->ticks = ticks;
1126 tu->qused++;
1127 }
1128 __wake:
1129 spin_unlock(&tu->qlock);
1130 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1131 wake_up(&tu->qchange_sleep);
1132 }
1133
1134 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1135 struct snd_timer_tread *tread)
1136 {
1137 if (tu->qused >= tu->queue_size) {
1138 tu->overrun++;
1139 } else {
1140 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1141 tu->qtail %= tu->queue_size;
1142 tu->qused++;
1143 }
1144 }
1145
1146 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1147 int event,
1148 struct timespec *tstamp,
1149 unsigned long resolution)
1150 {
1151 struct snd_timer_user *tu = timeri->callback_data;
1152 struct snd_timer_tread r1;
1153
1154 if (event >= SNDRV_TIMER_EVENT_START &&
1155 event <= SNDRV_TIMER_EVENT_PAUSE)
1156 tu->tstamp = *tstamp;
1157 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1158 return;
1159 r1.event = event;
1160 r1.tstamp = *tstamp;
1161 r1.val = resolution;
1162 spin_lock(&tu->qlock);
1163 snd_timer_user_append_to_tqueue(tu, &r1);
1164 spin_unlock(&tu->qlock);
1165 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1166 wake_up(&tu->qchange_sleep);
1167 }
1168
1169 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1170 unsigned long resolution,
1171 unsigned long ticks)
1172 {
1173 struct snd_timer_user *tu = timeri->callback_data;
1174 struct snd_timer_tread *r, r1;
1175 struct timespec tstamp;
1176 int prev, append = 0;
1177
1178 memset(&tstamp, 0, sizeof(tstamp));
1179 spin_lock(&tu->qlock);
1180 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1181 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1182 spin_unlock(&tu->qlock);
1183 return;
1184 }
1185 if (tu->last_resolution != resolution || ticks > 0)
1186 getnstimeofday(&tstamp);
1187 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1188 tu->last_resolution != resolution) {
1189 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1190 r1.tstamp = tstamp;
1191 r1.val = resolution;
1192 snd_timer_user_append_to_tqueue(tu, &r1);
1193 tu->last_resolution = resolution;
1194 append++;
1195 }
1196 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1197 goto __wake;
1198 if (ticks == 0)
1199 goto __wake;
1200 if (tu->qused > 0) {
1201 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1202 r = &tu->tqueue[prev];
1203 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1204 r->tstamp = tstamp;
1205 r->val += ticks;
1206 append++;
1207 goto __wake;
1208 }
1209 }
1210 r1.event = SNDRV_TIMER_EVENT_TICK;
1211 r1.tstamp = tstamp;
1212 r1.val = ticks;
1213 snd_timer_user_append_to_tqueue(tu, &r1);
1214 append++;
1215 __wake:
1216 spin_unlock(&tu->qlock);
1217 if (append == 0)
1218 return;
1219 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1220 wake_up(&tu->qchange_sleep);
1221 }
1222
1223 static int snd_timer_user_open(struct inode *inode, struct file *file)
1224 {
1225 struct snd_timer_user *tu;
1226
1227 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1228 if (tu == NULL)
1229 return -ENOMEM;
1230 spin_lock_init(&tu->qlock);
1231 init_waitqueue_head(&tu->qchange_sleep);
1232 mutex_init(&tu->tread_sem);
1233 tu->ticks = 1;
1234 tu->queue_size = 128;
1235 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1236 GFP_KERNEL);
1237 if (tu->queue == NULL) {
1238 kfree(tu);
1239 return -ENOMEM;
1240 }
1241 file->private_data = tu;
1242 return 0;
1243 }
1244
1245 static int snd_timer_user_release(struct inode *inode, struct file *file)
1246 {
1247 struct snd_timer_user *tu;
1248
1249 if (file->private_data) {
1250 tu = file->private_data;
1251 file->private_data = NULL;
1252 fasync_helper(-1, file, 0, &tu->fasync);
1253 if (tu->timeri)
1254 snd_timer_close(tu->timeri);
1255 kfree(tu->queue);
1256 kfree(tu->tqueue);
1257 kfree(tu);
1258 }
1259 return 0;
1260 }
1261
1262 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1263 {
1264 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1265 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1266 id->card = -1;
1267 id->device = -1;
1268 id->subdevice = -1;
1269 }
1270
1271 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1272 {
1273 id->dev_class = timer->tmr_class;
1274 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1275 id->card = timer->card ? timer->card->number : -1;
1276 id->device = timer->tmr_device;
1277 id->subdevice = timer->tmr_subdevice;
1278 }
1279
1280 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1281 {
1282 struct snd_timer_id id;
1283 struct snd_timer *timer;
1284 struct list_head *p;
1285
1286 if (copy_from_user(&id, _tid, sizeof(id)))
1287 return -EFAULT;
1288 mutex_lock(&register_mutex);
1289 if (id.dev_class < 0) { /* first item */
1290 if (list_empty(&snd_timer_list))
1291 snd_timer_user_zero_id(&id);
1292 else {
1293 timer = list_entry(snd_timer_list.next,
1294 struct snd_timer, device_list);
1295 snd_timer_user_copy_id(&id, timer);
1296 }
1297 } else {
1298 switch (id.dev_class) {
1299 case SNDRV_TIMER_CLASS_GLOBAL:
1300 id.device = id.device < 0 ? 0 : id.device + 1;
1301 list_for_each(p, &snd_timer_list) {
1302 timer = list_entry(p, struct snd_timer, device_list);
1303 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1304 snd_timer_user_copy_id(&id, timer);
1305 break;
1306 }
1307 if (timer->tmr_device >= id.device) {
1308 snd_timer_user_copy_id(&id, timer);
1309 break;
1310 }
1311 }
1312 if (p == &snd_timer_list)
1313 snd_timer_user_zero_id(&id);
1314 break;
1315 case SNDRV_TIMER_CLASS_CARD:
1316 case SNDRV_TIMER_CLASS_PCM:
1317 if (id.card < 0) {
1318 id.card = 0;
1319 } else {
1320 if (id.card < 0) {
1321 id.card = 0;
1322 } else {
1323 if (id.device < 0) {
1324 id.device = 0;
1325 } else {
1326 if (id.subdevice < 0) {
1327 id.subdevice = 0;
1328 } else {
1329 id.subdevice++;
1330 }
1331 }
1332 }
1333 }
1334 list_for_each(p, &snd_timer_list) {
1335 timer = list_entry(p, struct snd_timer, device_list);
1336 if (timer->tmr_class > id.dev_class) {
1337 snd_timer_user_copy_id(&id, timer);
1338 break;
1339 }
1340 if (timer->tmr_class < id.dev_class)
1341 continue;
1342 if (timer->card->number > id.card) {
1343 snd_timer_user_copy_id(&id, timer);
1344 break;
1345 }
1346 if (timer->card->number < id.card)
1347 continue;
1348 if (timer->tmr_device > id.device) {
1349 snd_timer_user_copy_id(&id, timer);
1350 break;
1351 }
1352 if (timer->tmr_device < id.device)
1353 continue;
1354 if (timer->tmr_subdevice > id.subdevice) {
1355 snd_timer_user_copy_id(&id, timer);
1356 break;
1357 }
1358 if (timer->tmr_subdevice < id.subdevice)
1359 continue;
1360 snd_timer_user_copy_id(&id, timer);
1361 break;
1362 }
1363 if (p == &snd_timer_list)
1364 snd_timer_user_zero_id(&id);
1365 break;
1366 default:
1367 snd_timer_user_zero_id(&id);
1368 }
1369 }
1370 mutex_unlock(&register_mutex);
1371 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1372 return -EFAULT;
1373 return 0;
1374 }
1375
1376 static int snd_timer_user_ginfo(struct file *file,
1377 struct snd_timer_ginfo __user *_ginfo)
1378 {
1379 struct snd_timer_ginfo *ginfo;
1380 struct snd_timer_id tid;
1381 struct snd_timer *t;
1382 struct list_head *p;
1383 int err = 0;
1384
1385 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1386 if (! ginfo)
1387 return -ENOMEM;
1388 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1389 kfree(ginfo);
1390 return -EFAULT;
1391 }
1392 tid = ginfo->tid;
1393 memset(ginfo, 0, sizeof(*ginfo));
1394 ginfo->tid = tid;
1395 mutex_lock(&register_mutex);
1396 t = snd_timer_find(&tid);
1397 if (t != NULL) {
1398 ginfo->card = t->card ? t->card->number : -1;
1399 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1400 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1401 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1402 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1403 ginfo->resolution = t->hw.resolution;
1404 if (t->hw.resolution_min > 0) {
1405 ginfo->resolution_min = t->hw.resolution_min;
1406 ginfo->resolution_max = t->hw.resolution_max;
1407 }
1408 list_for_each(p, &t->open_list_head) {
1409 ginfo->clients++;
1410 }
1411 } else {
1412 err = -ENODEV;
1413 }
1414 mutex_unlock(&register_mutex);
1415 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1416 err = -EFAULT;
1417 kfree(ginfo);
1418 return err;
1419 }
1420
1421 static int snd_timer_user_gparams(struct file *file,
1422 struct snd_timer_gparams __user *_gparams)
1423 {
1424 struct snd_timer_gparams gparams;
1425 struct snd_timer *t;
1426 int err;
1427
1428 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1429 return -EFAULT;
1430 mutex_lock(&register_mutex);
1431 t = snd_timer_find(&gparams.tid);
1432 if (!t) {
1433 err = -ENODEV;
1434 goto _error;
1435 }
1436 if (!list_empty(&t->open_list_head)) {
1437 err = -EBUSY;
1438 goto _error;
1439 }
1440 if (!t->hw.set_period) {
1441 err = -ENOSYS;
1442 goto _error;
1443 }
1444 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1445 _error:
1446 mutex_unlock(&register_mutex);
1447 return err;
1448 }
1449
1450 static int snd_timer_user_gstatus(struct file *file,
1451 struct snd_timer_gstatus __user *_gstatus)
1452 {
1453 struct snd_timer_gstatus gstatus;
1454 struct snd_timer_id tid;
1455 struct snd_timer *t;
1456 int err = 0;
1457
1458 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1459 return -EFAULT;
1460 tid = gstatus.tid;
1461 memset(&gstatus, 0, sizeof(gstatus));
1462 gstatus.tid = tid;
1463 mutex_lock(&register_mutex);
1464 t = snd_timer_find(&tid);
1465 if (t != NULL) {
1466 if (t->hw.c_resolution)
1467 gstatus.resolution = t->hw.c_resolution(t);
1468 else
1469 gstatus.resolution = t->hw.resolution;
1470 if (t->hw.precise_resolution) {
1471 t->hw.precise_resolution(t, &gstatus.resolution_num,
1472 &gstatus.resolution_den);
1473 } else {
1474 gstatus.resolution_num = gstatus.resolution;
1475 gstatus.resolution_den = 1000000000uL;
1476 }
1477 } else {
1478 err = -ENODEV;
1479 }
1480 mutex_unlock(&register_mutex);
1481 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1482 err = -EFAULT;
1483 return err;
1484 }
1485
1486 static int snd_timer_user_tselect(struct file *file,
1487 struct snd_timer_select __user *_tselect)
1488 {
1489 struct snd_timer_user *tu;
1490 struct snd_timer_select tselect;
1491 char str[32];
1492 int err = 0;
1493
1494 tu = file->private_data;
1495 mutex_lock(&tu->tread_sem);
1496 if (tu->timeri) {
1497 snd_timer_close(tu->timeri);
1498 tu->timeri = NULL;
1499 }
1500 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1501 err = -EFAULT;
1502 goto __err;
1503 }
1504 sprintf(str, "application %i", current->pid);
1505 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1506 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1507 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1508 if (err < 0)
1509 goto __err;
1510
1511 kfree(tu->queue);
1512 tu->queue = NULL;
1513 kfree(tu->tqueue);
1514 tu->tqueue = NULL;
1515 if (tu->tread) {
1516 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1517 GFP_KERNEL);
1518 if (tu->tqueue == NULL)
1519 err = -ENOMEM;
1520 } else {
1521 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1522 GFP_KERNEL);
1523 if (tu->queue == NULL)
1524 err = -ENOMEM;
1525 }
1526
1527 if (err < 0) {
1528 snd_timer_close(tu->timeri);
1529 tu->timeri = NULL;
1530 } else {
1531 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1532 tu->timeri->callback = tu->tread
1533 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1534 tu->timeri->ccallback = snd_timer_user_ccallback;
1535 tu->timeri->callback_data = (void *)tu;
1536 }
1537
1538 __err:
1539 mutex_unlock(&tu->tread_sem);
1540 return err;
1541 }
1542
1543 static int snd_timer_user_info(struct file *file,
1544 struct snd_timer_info __user *_info)
1545 {
1546 struct snd_timer_user *tu;
1547 struct snd_timer_info *info;
1548 struct snd_timer *t;
1549 int err = 0;
1550
1551 tu = file->private_data;
1552 snd_assert(tu->timeri != NULL, return -ENXIO);
1553 t = tu->timeri->timer;
1554 snd_assert(t != NULL, return -ENXIO);
1555
1556 info = kzalloc(sizeof(*info), GFP_KERNEL);
1557 if (! info)
1558 return -ENOMEM;
1559 info->card = t->card ? t->card->number : -1;
1560 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1561 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1562 strlcpy(info->id, t->id, sizeof(info->id));
1563 strlcpy(info->name, t->name, sizeof(info->name));
1564 info->resolution = t->hw.resolution;
1565 if (copy_to_user(_info, info, sizeof(*_info)))
1566 err = -EFAULT;
1567 kfree(info);
1568 return err;
1569 }
1570
1571 static int snd_timer_user_params(struct file *file,
1572 struct snd_timer_params __user *_params)
1573 {
1574 struct snd_timer_user *tu;
1575 struct snd_timer_params params;
1576 struct snd_timer *t;
1577 struct snd_timer_read *tr;
1578 struct snd_timer_tread *ttr;
1579 int err;
1580
1581 tu = file->private_data;
1582 snd_assert(tu->timeri != NULL, return -ENXIO);
1583 t = tu->timeri->timer;
1584 snd_assert(t != NULL, return -ENXIO);
1585 if (copy_from_user(&params, _params, sizeof(params)))
1586 return -EFAULT;
1587 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1588 err = -EINVAL;
1589 goto _end;
1590 }
1591 if (params.queue_size > 0 &&
1592 (params.queue_size < 32 || params.queue_size > 1024)) {
1593 err = -EINVAL;
1594 goto _end;
1595 }
1596 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1597 (1<<SNDRV_TIMER_EVENT_TICK)|
1598 (1<<SNDRV_TIMER_EVENT_START)|
1599 (1<<SNDRV_TIMER_EVENT_STOP)|
1600 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1601 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1602 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1603 (1<<SNDRV_TIMER_EVENT_RESUME)|
1604 (1<<SNDRV_TIMER_EVENT_MSTART)|
1605 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1606 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1607 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1608 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1609 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1610 err = -EINVAL;
1611 goto _end;
1612 }
1613 snd_timer_stop(tu->timeri);
1614 spin_lock_irq(&t->lock);
1615 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1616 SNDRV_TIMER_IFLG_EXCLUSIVE|
1617 SNDRV_TIMER_IFLG_EARLY_EVENT);
1618 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1619 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1620 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1621 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1622 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1623 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1624 spin_unlock_irq(&t->lock);
1625 if (params.queue_size > 0 &&
1626 (unsigned int)tu->queue_size != params.queue_size) {
1627 if (tu->tread) {
1628 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1629 GFP_KERNEL);
1630 if (ttr) {
1631 kfree(tu->tqueue);
1632 tu->queue_size = params.queue_size;
1633 tu->tqueue = ttr;
1634 }
1635 } else {
1636 tr = kmalloc(params.queue_size * sizeof(*tr),
1637 GFP_KERNEL);
1638 if (tr) {
1639 kfree(tu->queue);
1640 tu->queue_size = params.queue_size;
1641 tu->queue = tr;
1642 }
1643 }
1644 }
1645 tu->qhead = tu->qtail = tu->qused = 0;
1646 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1647 if (tu->tread) {
1648 struct snd_timer_tread tread;
1649 tread.event = SNDRV_TIMER_EVENT_EARLY;
1650 tread.tstamp.tv_sec = 0;
1651 tread.tstamp.tv_nsec = 0;
1652 tread.val = 0;
1653 snd_timer_user_append_to_tqueue(tu, &tread);
1654 } else {
1655 struct snd_timer_read *r = &tu->queue[0];
1656 r->resolution = 0;
1657 r->ticks = 0;
1658 tu->qused++;
1659 tu->qtail++;
1660 }
1661 }
1662 tu->filter = params.filter;
1663 tu->ticks = params.ticks;
1664 err = 0;
1665 _end:
1666 if (copy_to_user(_params, &params, sizeof(params)))
1667 return -EFAULT;
1668 return err;
1669 }
1670
1671 static int snd_timer_user_status(struct file *file,
1672 struct snd_timer_status __user *_status)
1673 {
1674 struct snd_timer_user *tu;
1675 struct snd_timer_status status;
1676
1677 tu = file->private_data;
1678 snd_assert(tu->timeri != NULL, return -ENXIO);
1679 memset(&status, 0, sizeof(status));
1680 status.tstamp = tu->tstamp;
1681 status.resolution = snd_timer_resolution(tu->timeri);
1682 status.lost = tu->timeri->lost;
1683 status.overrun = tu->overrun;
1684 spin_lock_irq(&tu->qlock);
1685 status.queue = tu->qused;
1686 spin_unlock_irq(&tu->qlock);
1687 if (copy_to_user(_status, &status, sizeof(status)))
1688 return -EFAULT;
1689 return 0;
1690 }
1691
1692 static int snd_timer_user_start(struct file *file)
1693 {
1694 int err;
1695 struct snd_timer_user *tu;
1696
1697 tu = file->private_data;
1698 snd_assert(tu->timeri != NULL, return -ENXIO);
1699 snd_timer_stop(tu->timeri);
1700 tu->timeri->lost = 0;
1701 tu->last_resolution = 0;
1702 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1703 }
1704
1705 static int snd_timer_user_stop(struct file *file)
1706 {
1707 int err;
1708 struct snd_timer_user *tu;
1709
1710 tu = file->private_data;
1711 snd_assert(tu->timeri != NULL, return -ENXIO);
1712 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1713 }
1714
1715 static int snd_timer_user_continue(struct file *file)
1716 {
1717 int err;
1718 struct snd_timer_user *tu;
1719
1720 tu = file->private_data;
1721 snd_assert(tu->timeri != NULL, return -ENXIO);
1722 tu->timeri->lost = 0;
1723 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1724 }
1725
1726 static int snd_timer_user_pause(struct file *file)
1727 {
1728 int err;
1729 struct snd_timer_user *tu;
1730
1731 tu = file->private_data;
1732 snd_assert(tu->timeri != NULL, return -ENXIO);
1733 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1734 }
1735
1736 enum {
1737 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1738 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1739 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1740 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1741 };
1742
1743 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1744 unsigned long arg)
1745 {
1746 struct snd_timer_user *tu;
1747 void __user *argp = (void __user *)arg;
1748 int __user *p = argp;
1749
1750 tu = file->private_data;
1751 switch (cmd) {
1752 case SNDRV_TIMER_IOCTL_PVERSION:
1753 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1754 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1755 return snd_timer_user_next_device(argp);
1756 case SNDRV_TIMER_IOCTL_TREAD:
1757 {
1758 int xarg;
1759
1760 mutex_lock(&tu->tread_sem);
1761 if (tu->timeri) { /* too late */
1762 mutex_unlock(&tu->tread_sem);
1763 return -EBUSY;
1764 }
1765 if (get_user(xarg, p)) {
1766 mutex_unlock(&tu->tread_sem);
1767 return -EFAULT;
1768 }
1769 tu->tread = xarg ? 1 : 0;
1770 mutex_unlock(&tu->tread_sem);
1771 return 0;
1772 }
1773 case SNDRV_TIMER_IOCTL_GINFO:
1774 return snd_timer_user_ginfo(file, argp);
1775 case SNDRV_TIMER_IOCTL_GPARAMS:
1776 return snd_timer_user_gparams(file, argp);
1777 case SNDRV_TIMER_IOCTL_GSTATUS:
1778 return snd_timer_user_gstatus(file, argp);
1779 case SNDRV_TIMER_IOCTL_SELECT:
1780 return snd_timer_user_tselect(file, argp);
1781 case SNDRV_TIMER_IOCTL_INFO:
1782 return snd_timer_user_info(file, argp);
1783 case SNDRV_TIMER_IOCTL_PARAMS:
1784 return snd_timer_user_params(file, argp);
1785 case SNDRV_TIMER_IOCTL_STATUS:
1786 return snd_timer_user_status(file, argp);
1787 case SNDRV_TIMER_IOCTL_START:
1788 case SNDRV_TIMER_IOCTL_START_OLD:
1789 return snd_timer_user_start(file);
1790 case SNDRV_TIMER_IOCTL_STOP:
1791 case SNDRV_TIMER_IOCTL_STOP_OLD:
1792 return snd_timer_user_stop(file);
1793 case SNDRV_TIMER_IOCTL_CONTINUE:
1794 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1795 return snd_timer_user_continue(file);
1796 case SNDRV_TIMER_IOCTL_PAUSE:
1797 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1798 return snd_timer_user_pause(file);
1799 }
1800 return -ENOTTY;
1801 }
1802
1803 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1804 {
1805 struct snd_timer_user *tu;
1806 int err;
1807
1808 tu = file->private_data;
1809 err = fasync_helper(fd, file, on, &tu->fasync);
1810 if (err < 0)
1811 return err;
1812 return 0;
1813 }
1814
1815 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1816 size_t count, loff_t *offset)
1817 {
1818 struct snd_timer_user *tu;
1819 long result = 0, unit;
1820 int err = 0;
1821
1822 tu = file->private_data;
1823 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1824 spin_lock_irq(&tu->qlock);
1825 while ((long)count - result >= unit) {
1826 while (!tu->qused) {
1827 wait_queue_t wait;
1828
1829 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1830 err = -EAGAIN;
1831 break;
1832 }
1833
1834 set_current_state(TASK_INTERRUPTIBLE);
1835 init_waitqueue_entry(&wait, current);
1836 add_wait_queue(&tu->qchange_sleep, &wait);
1837
1838 spin_unlock_irq(&tu->qlock);
1839 schedule();
1840 spin_lock_irq(&tu->qlock);
1841
1842 remove_wait_queue(&tu->qchange_sleep, &wait);
1843
1844 if (signal_pending(current)) {
1845 err = -ERESTARTSYS;
1846 break;
1847 }
1848 }
1849
1850 spin_unlock_irq(&tu->qlock);
1851 if (err < 0)
1852 goto _error;
1853
1854 if (tu->tread) {
1855 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1856 sizeof(struct snd_timer_tread))) {
1857 err = -EFAULT;
1858 goto _error;
1859 }
1860 } else {
1861 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1862 sizeof(struct snd_timer_read))) {
1863 err = -EFAULT;
1864 goto _error;
1865 }
1866 }
1867
1868 tu->qhead %= tu->queue_size;
1869
1870 result += unit;
1871 buffer += unit;
1872
1873 spin_lock_irq(&tu->qlock);
1874 tu->qused--;
1875 }
1876 spin_unlock_irq(&tu->qlock);
1877 _error:
1878 return result > 0 ? result : err;
1879 }
1880
1881 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1882 {
1883 unsigned int mask;
1884 struct snd_timer_user *tu;
1885
1886 tu = file->private_data;
1887
1888 poll_wait(file, &tu->qchange_sleep, wait);
1889
1890 mask = 0;
1891 if (tu->qused)
1892 mask |= POLLIN | POLLRDNORM;
1893
1894 return mask;
1895 }
1896
1897 #ifdef CONFIG_COMPAT
1898 #include "timer_compat.c"
1899 #else
1900 #define snd_timer_user_ioctl_compat NULL
1901 #endif
1902
1903 static const struct file_operations snd_timer_f_ops =
1904 {
1905 .owner = THIS_MODULE,
1906 .read = snd_timer_user_read,
1907 .open = snd_timer_user_open,
1908 .release = snd_timer_user_release,
1909 .poll = snd_timer_user_poll,
1910 .unlocked_ioctl = snd_timer_user_ioctl,
1911 .compat_ioctl = snd_timer_user_ioctl_compat,
1912 .fasync = snd_timer_user_fasync,
1913 };
1914
1915 /*
1916 * ENTRY functions
1917 */
1918
1919 static int __init alsa_timer_init(void)
1920 {
1921 int err;
1922
1923 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1924 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1925 "system timer");
1926 #endif
1927
1928 if ((err = snd_timer_register_system()) < 0)
1929 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1930 err);
1931 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1932 &snd_timer_f_ops, NULL, "timer")) < 0)
1933 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1934 err);
1935 snd_timer_proc_init();
1936 return 0;
1937 }
1938
1939 static void __exit alsa_timer_exit(void)
1940 {
1941 struct list_head *p, *n;
1942
1943 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1944 /* unregister the system timer */
1945 list_for_each_safe(p, n, &snd_timer_list) {
1946 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1947 snd_timer_free(timer);
1948 }
1949 snd_timer_proc_done();
1950 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1951 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1952 #endif
1953 }
1954
1955 module_init(alsa_timer_init)
1956 module_exit(alsa_timer_exit)
1957
1958 EXPORT_SYMBOL(snd_timer_open);
1959 EXPORT_SYMBOL(snd_timer_close);
1960 EXPORT_SYMBOL(snd_timer_resolution);
1961 EXPORT_SYMBOL(snd_timer_start);
1962 EXPORT_SYMBOL(snd_timer_stop);
1963 EXPORT_SYMBOL(snd_timer_continue);
1964 EXPORT_SYMBOL(snd_timer_pause);
1965 EXPORT_SYMBOL(snd_timer_new);
1966 EXPORT_SYMBOL(snd_timer_notify);
1967 EXPORT_SYMBOL(snd_timer_global_new);
1968 EXPORT_SYMBOL(snd_timer_global_free);
1969 EXPORT_SYMBOL(snd_timer_global_register);
1970 EXPORT_SYMBOL(snd_timer_interrupt);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree