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Linux 2.6.18.8
[linux-2.6/suspend2-2.6.18.git] / sound / core / timer.c
blob0a984e881c1089ee68ac4ca11c8ad98a82d0902e
1 /*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <sound/driver.h>
23 #include <linux/delay.h>
24 #include <linux/init.h>
25 #include <linux/smp_lock.h>
26 #include <linux/slab.h>
27 #include <linux/time.h>
28 #include <linux/mutex.h>
29 #include <linux/moduleparam.h>
30 #include <linux/string.h>
31 #include <sound/core.h>
32 #include <sound/timer.h>
33 #include <sound/control.h>
34 #include <sound/info.h>
35 #include <sound/minors.h>
36 #include <sound/initval.h>
37 #include <linux/kmod.h>
38 #ifdef CONFIG_KERNELD
39 #include <linux/kerneld.h>
40 #endif
41
42 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
43 #define DEFAULT_TIMER_LIMIT 3
44 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
45 #define DEFAULT_TIMER_LIMIT 2
46 #else
47 #define DEFAULT_TIMER_LIMIT 1
48 #endif
49
50 static int timer_limit = DEFAULT_TIMER_LIMIT;
51 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>");
52 MODULE_DESCRIPTION("ALSA timer interface");
53 MODULE_LICENSE("GPL");
54 module_param(timer_limit, int, 0444);
55 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
56
57 struct snd_timer_user {
58 struct snd_timer_instance *timeri;
59 int tread; /* enhanced read with timestamps and events */
60 unsigned long ticks;
61 unsigned long overrun;
62 int qhead;
63 int qtail;
64 int qused;
65 int queue_size;
66 struct snd_timer_read *queue;
67 struct snd_timer_tread *tqueue;
68 spinlock_t qlock;
69 unsigned long last_resolution;
70 unsigned int filter;
71 struct timespec tstamp; /* trigger tstamp */
72 wait_queue_head_t qchange_sleep;
73 struct fasync_struct *fasync;
74 struct mutex tread_sem;
75 };
76
77 /* list of timers */
78 static LIST_HEAD(snd_timer_list);
79
80 /* list of slave instances */
81 static LIST_HEAD(snd_timer_slave_list);
82
83 /* lock for slave active lists */
84 static DEFINE_SPINLOCK(slave_active_lock);
85
86 static DEFINE_MUTEX(register_mutex);
87
88 static int snd_timer_free(struct snd_timer *timer);
89 static int snd_timer_dev_free(struct snd_device *device);
90 static int snd_timer_dev_register(struct snd_device *device);
91 static int snd_timer_dev_unregister(struct snd_device *device);
92
93 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
94
95 /*
96 * create a timer instance with the given owner string.
97 * when timer is not NULL, increments the module counter
98 */
99 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
100 struct snd_timer *timer)
101 {
102 struct snd_timer_instance *timeri;
103 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
104 if (timeri == NULL)
105 return NULL;
106 timeri->owner = kstrdup(owner, GFP_KERNEL);
107 if (! timeri->owner) {
108 kfree(timeri);
109 return NULL;
110 }
111 INIT_LIST_HEAD(&timeri->open_list);
112 INIT_LIST_HEAD(&timeri->active_list);
113 INIT_LIST_HEAD(&timeri->ack_list);
114 INIT_LIST_HEAD(&timeri->slave_list_head);
115 INIT_LIST_HEAD(&timeri->slave_active_head);
116
117 timeri->timer = timer;
118 if (timer && !try_module_get(timer->module)) {
119 kfree(timeri->owner);
120 kfree(timeri);
121 return NULL;
122 }
123
124 return timeri;
125 }
126
127 /*
128 * find a timer instance from the given timer id
129 */
130 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
131 {
132 struct snd_timer *timer = NULL;
133 struct list_head *p;
134
135 list_for_each(p, &snd_timer_list) {
136 timer = list_entry(p, struct snd_timer, device_list);
137
138 if (timer->tmr_class != tid->dev_class)
139 continue;
140 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
141 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
142 (timer->card == NULL ||
143 timer->card->number != tid->card))
144 continue;
145 if (timer->tmr_device != tid->device)
146 continue;
147 if (timer->tmr_subdevice != tid->subdevice)
148 continue;
149 return timer;
150 }
151 return NULL;
152 }
153
154 #ifdef CONFIG_KMOD
155
156 static void snd_timer_request(struct snd_timer_id *tid)
157 {
158 if (! current->fs->root)
159 return;
160 switch (tid->dev_class) {
161 case SNDRV_TIMER_CLASS_GLOBAL:
162 if (tid->device < timer_limit)
163 request_module("snd-timer-%i", tid->device);
164 break;
165 case SNDRV_TIMER_CLASS_CARD:
166 case SNDRV_TIMER_CLASS_PCM:
167 if (tid->card < snd_ecards_limit)
168 request_module("snd-card-%i", tid->card);
169 break;
170 default:
171 break;
172 }
173 }
174
175 #endif
176
177 /*
178 * look for a master instance matching with the slave id of the given slave.
179 * when found, relink the open_link of the slave.
180 *
181 * call this with register_mutex down.
182 */
183 static void snd_timer_check_slave(struct snd_timer_instance *slave)
184 {
185 struct snd_timer *timer;
186 struct snd_timer_instance *master;
187 struct list_head *p, *q;
188
189 /* FIXME: it's really dumb to look up all entries.. */
190 list_for_each(p, &snd_timer_list) {
191 timer = list_entry(p, struct snd_timer, device_list);
192 list_for_each(q, &timer->open_list_head) {
193 master = list_entry(q, struct snd_timer_instance, open_list);
194 if (slave->slave_class == master->slave_class &&
195 slave->slave_id == master->slave_id) {
196 list_del(&slave->open_list);
197 list_add_tail(&slave->open_list,
198 &master->slave_list_head);
199 spin_lock_irq(&slave_active_lock);
200 slave->master = master;
201 slave->timer = master->timer;
202 spin_unlock_irq(&slave_active_lock);
203 return;
204 }
205 }
206 }
207 }
208
209 /*
210 * look for slave instances matching with the slave id of the given master.
211 * when found, relink the open_link of slaves.
212 *
213 * call this with register_mutex down.
214 */
215 static void snd_timer_check_master(struct snd_timer_instance *master)
216 {
217 struct snd_timer_instance *slave;
218 struct list_head *p, *n;
219
220 /* check all pending slaves */
221 list_for_each_safe(p, n, &snd_timer_slave_list) {
222 slave = list_entry(p, struct snd_timer_instance, open_list);
223 if (slave->slave_class == master->slave_class &&
224 slave->slave_id == master->slave_id) {
225 list_del(p);
226 list_add_tail(p, &master->slave_list_head);
227 spin_lock_irq(&slave_active_lock);
228 slave->master = master;
229 slave->timer = master->timer;
230 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
231 list_add_tail(&slave->active_list,
232 &master->slave_active_head);
233 spin_unlock_irq(&slave_active_lock);
234 }
235 }
236 }
237
238 /*
239 * open a timer instance
240 * when opening a master, the slave id must be here given.
241 */
242 int snd_timer_open(struct snd_timer_instance **ti,
243 char *owner, struct snd_timer_id *tid,
244 unsigned int slave_id)
245 {
246 struct snd_timer *timer;
247 struct snd_timer_instance *timeri = NULL;
248
249 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
250 /* open a slave instance */
251 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
252 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
253 snd_printd("invalid slave class %i\n", tid->dev_sclass);
254 return -EINVAL;
255 }
256 mutex_lock(&register_mutex);
257 timeri = snd_timer_instance_new(owner, NULL);
258 if (!timeri) {
259 mutex_unlock(&register_mutex);
260 return -ENOMEM;
261 }
262 timeri->slave_class = tid->dev_sclass;
263 timeri->slave_id = tid->device;
264 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
265 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
266 snd_timer_check_slave(timeri);
267 mutex_unlock(&register_mutex);
268 *ti = timeri;
269 return 0;
270 }
271
272 /* open a master instance */
273 mutex_lock(&register_mutex);
274 timer = snd_timer_find(tid);
275 #ifdef CONFIG_KMOD
276 if (timer == NULL) {
277 mutex_unlock(&register_mutex);
278 snd_timer_request(tid);
279 mutex_lock(&register_mutex);
280 timer = snd_timer_find(tid);
281 }
282 #endif
283 if (!timer) {
284 mutex_unlock(&register_mutex);
285 return -ENODEV;
286 }
287 if (!list_empty(&timer->open_list_head)) {
288 timeri = list_entry(timer->open_list_head.next,
289 struct snd_timer_instance, open_list);
290 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
291 mutex_unlock(&register_mutex);
292 return -EBUSY;
293 }
294 }
295 timeri = snd_timer_instance_new(owner, timer);
296 if (!timeri) {
297 mutex_unlock(&register_mutex);
298 return -ENOMEM;
299 }
300 timeri->slave_class = tid->dev_sclass;
301 timeri->slave_id = slave_id;
302 if (list_empty(&timer->open_list_head) && timer->hw.open)
303 timer->hw.open(timer);
304 list_add_tail(&timeri->open_list, &timer->open_list_head);
305 snd_timer_check_master(timeri);
306 mutex_unlock(&register_mutex);
307 *ti = timeri;
308 return 0;
309 }
310
311 static int _snd_timer_stop(struct snd_timer_instance *timeri,
312 int keep_flag, int event);
313
314 /*
315 * close a timer instance
316 */
317 int snd_timer_close(struct snd_timer_instance *timeri)
318 {
319 struct snd_timer *timer = NULL;
320 struct list_head *p, *n;
321 struct snd_timer_instance *slave;
322
323 snd_assert(timeri != NULL, return -ENXIO);
324
325 /* force to stop the timer */
326 snd_timer_stop(timeri);
327
328 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
329 /* wait, until the active callback is finished */
330 spin_lock_irq(&slave_active_lock);
331 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
332 spin_unlock_irq(&slave_active_lock);
333 udelay(10);
334 spin_lock_irq(&slave_active_lock);
335 }
336 spin_unlock_irq(&slave_active_lock);
337 mutex_lock(&register_mutex);
338 list_del(&timeri->open_list);
339 mutex_unlock(&register_mutex);
340 } else {
341 timer = timeri->timer;
342 /* wait, until the active callback is finished */
343 spin_lock_irq(&timer->lock);
344 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
345 spin_unlock_irq(&timer->lock);
346 udelay(10);
347 spin_lock_irq(&timer->lock);
348 }
349 spin_unlock_irq(&timer->lock);
350 mutex_lock(&register_mutex);
351 list_del(&timeri->open_list);
352 if (timer && list_empty(&timer->open_list_head) &&
353 timer->hw.close)
354 timer->hw.close(timer);
355 /* remove slave links */
356 list_for_each_safe(p, n, &timeri->slave_list_head) {
357 slave = list_entry(p, struct snd_timer_instance, open_list);
358 spin_lock_irq(&slave_active_lock);
359 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
360 list_del(p);
361 list_add_tail(p, &snd_timer_slave_list);
362 slave->master = NULL;
363 slave->timer = NULL;
364 spin_unlock_irq(&slave_active_lock);
365 }
366 mutex_unlock(&register_mutex);
367 }
368 if (timeri->private_free)
369 timeri->private_free(timeri);
370 kfree(timeri->owner);
371 kfree(timeri);
372 if (timer)
373 module_put(timer->module);
374 return 0;
375 }
376
377 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
378 {
379 struct snd_timer * timer;
380
381 if (timeri == NULL)
382 return 0;
383 if ((timer = timeri->timer) != NULL) {
384 if (timer->hw.c_resolution)
385 return timer->hw.c_resolution(timer);
386 return timer->hw.resolution;
387 }
388 return 0;
389 }
390
391 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
392 {
393 struct snd_timer *timer;
394 unsigned long flags;
395 unsigned long resolution = 0;
396 struct snd_timer_instance *ts;
397 struct list_head *n;
398 struct timespec tstamp;
399
400 getnstimeofday(&tstamp);
401 snd_assert(event >= SNDRV_TIMER_EVENT_START &&
402 event <= SNDRV_TIMER_EVENT_PAUSE, return);
403 if (event == SNDRV_TIMER_EVENT_START ||
404 event == SNDRV_TIMER_EVENT_CONTINUE)
405 resolution = snd_timer_resolution(ti);
406 if (ti->ccallback)
407 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
408 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
409 return;
410 timer = ti->timer;
411 if (timer == NULL)
412 return;
413 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
414 return;
415 spin_lock_irqsave(&timer->lock, flags);
416 list_for_each(n, &ti->slave_active_head) {
417 ts = list_entry(n, struct snd_timer_instance, active_list);
418 if (ts->ccallback)
419 ts->ccallback(ti, event + 100, &tstamp, resolution);
420 }
421 spin_unlock_irqrestore(&timer->lock, flags);
422 }
423
424 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
425 unsigned long sticks)
426 {
427 list_del(&timeri->active_list);
428 list_add_tail(&timeri->active_list, &timer->active_list_head);
429 if (timer->running) {
430 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
431 goto __start_now;
432 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
433 timeri->flags |= SNDRV_TIMER_IFLG_START;
434 return 1; /* delayed start */
435 } else {
436 timer->sticks = sticks;
437 timer->hw.start(timer);
438 __start_now:
439 timer->running++;
440 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
441 return 0;
442 }
443 }
444
445 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
446 {
447 unsigned long flags;
448
449 spin_lock_irqsave(&slave_active_lock, flags);
450 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
451 if (timeri->master)
452 list_add_tail(&timeri->active_list,
453 &timeri->master->slave_active_head);
454 spin_unlock_irqrestore(&slave_active_lock, flags);
455 return 1; /* delayed start */
456 }
457
458 /*
459 * start the timer instance
460 */
461 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
462 {
463 struct snd_timer *timer;
464 int result = -EINVAL;
465 unsigned long flags;
466
467 if (timeri == NULL || ticks < 1)
468 return -EINVAL;
469 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
470 result = snd_timer_start_slave(timeri);
471 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
472 return result;
473 }
474 timer = timeri->timer;
475 if (timer == NULL)
476 return -EINVAL;
477 spin_lock_irqsave(&timer->lock, flags);
478 timeri->ticks = timeri->cticks = ticks;
479 timeri->pticks = 0;
480 result = snd_timer_start1(timer, timeri, ticks);
481 spin_unlock_irqrestore(&timer->lock, flags);
482 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
483 return result;
484 }
485
486 static int _snd_timer_stop(struct snd_timer_instance * timeri,
487 int keep_flag, int event)
488 {
489 struct snd_timer *timer;
490 unsigned long flags;
491
492 snd_assert(timeri != NULL, return -ENXIO);
493
494 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
495 if (!keep_flag) {
496 spin_lock_irqsave(&slave_active_lock, flags);
497 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
498 spin_unlock_irqrestore(&slave_active_lock, flags);
499 }
500 goto __end;
501 }
502 timer = timeri->timer;
503 if (!timer)
504 return -EINVAL;
505 spin_lock_irqsave(&timer->lock, flags);
506 list_del_init(&timeri->ack_list);
507 list_del_init(&timeri->active_list);
508 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
509 !(--timer->running)) {
510 timer->hw.stop(timer);
511 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
512 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
513 snd_timer_reschedule(timer, 0);
514 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
515 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
516 timer->hw.start(timer);
517 }
518 }
519 }
520 if (!keep_flag)
521 timeri->flags &=
522 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
523 spin_unlock_irqrestore(&timer->lock, flags);
524 __end:
525 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
526 snd_timer_notify1(timeri, event);
527 return 0;
528 }
529
530 /*
531 * stop the timer instance.
532 *
533 * do not call this from the timer callback!
534 */
535 int snd_timer_stop(struct snd_timer_instance *timeri)
536 {
537 struct snd_timer *timer;
538 unsigned long flags;
539 int err;
540
541 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
542 if (err < 0)
543 return err;
544 timer = timeri->timer;
545 spin_lock_irqsave(&timer->lock, flags);
546 timeri->cticks = timeri->ticks;
547 timeri->pticks = 0;
548 spin_unlock_irqrestore(&timer->lock, flags);
549 return 0;
550 }
551
552 /*
553 * start again.. the tick is kept.
554 */
555 int snd_timer_continue(struct snd_timer_instance *timeri)
556 {
557 struct snd_timer *timer;
558 int result = -EINVAL;
559 unsigned long flags;
560
561 if (timeri == NULL)
562 return result;
563 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
564 return snd_timer_start_slave(timeri);
565 timer = timeri->timer;
566 if (! timer)
567 return -EINVAL;
568 spin_lock_irqsave(&timer->lock, flags);
569 if (!timeri->cticks)
570 timeri->cticks = 1;
571 timeri->pticks = 0;
572 result = snd_timer_start1(timer, timeri, timer->sticks);
573 spin_unlock_irqrestore(&timer->lock, flags);
574 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
575 return result;
576 }
577
578 /*
579 * pause.. remember the ticks left
580 */
581 int snd_timer_pause(struct snd_timer_instance * timeri)
582 {
583 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
584 }
585
586 /*
587 * reschedule the timer
588 *
589 * start pending instances and check the scheduling ticks.
590 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
591 */
592 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
593 {
594 struct snd_timer_instance *ti;
595 unsigned long ticks = ~0UL;
596 struct list_head *p;
597
598 list_for_each(p, &timer->active_list_head) {
599 ti = list_entry(p, struct snd_timer_instance, active_list);
600 if (ti->flags & SNDRV_TIMER_IFLG_START) {
601 ti->flags &= ~SNDRV_TIMER_IFLG_START;
602 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
603 timer->running++;
604 }
605 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
606 if (ticks > ti->cticks)
607 ticks = ti->cticks;
608 }
609 }
610 if (ticks == ~0UL) {
611 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
612 return;
613 }
614 if (ticks > timer->hw.ticks)
615 ticks = timer->hw.ticks;
616 if (ticks_left != ticks)
617 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
618 timer->sticks = ticks;
619 }
620
621 /*
622 * timer tasklet
623 *
624 */
625 static void snd_timer_tasklet(unsigned long arg)
626 {
627 struct snd_timer *timer = (struct snd_timer *) arg;
628 struct snd_timer_instance *ti;
629 struct list_head *p;
630 unsigned long resolution, ticks;
631 unsigned long flags;
632
633 spin_lock_irqsave(&timer->lock, flags);
634 /* now process all callbacks */
635 while (!list_empty(&timer->sack_list_head)) {
636 p = timer->sack_list_head.next; /* get first item */
637 ti = list_entry(p, struct snd_timer_instance, ack_list);
638
639 /* remove from ack_list and make empty */
640 list_del_init(p);
641
642 ticks = ti->pticks;
643 ti->pticks = 0;
644 resolution = ti->resolution;
645
646 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
647 spin_unlock(&timer->lock);
648 if (ti->callback)
649 ti->callback(ti, resolution, ticks);
650 spin_lock(&timer->lock);
651 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
652 }
653 spin_unlock_irqrestore(&timer->lock, flags);
654 }
655
656 /*
657 * timer interrupt
658 *
659 * ticks_left is usually equal to timer->sticks.
660 *
661 */
662 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
663 {
664 struct snd_timer_instance *ti, *ts;
665 unsigned long resolution, ticks;
666 struct list_head *p, *q, *n, *ack_list_head;
667 unsigned long flags;
668 int use_tasklet = 0;
669
670 if (timer == NULL)
671 return;
672
673 spin_lock_irqsave(&timer->lock, flags);
674
675 /* remember the current resolution */
676 if (timer->hw.c_resolution)
677 resolution = timer->hw.c_resolution(timer);
678 else
679 resolution = timer->hw.resolution;
680
681 /* loop for all active instances
682 * Here we cannot use list_for_each because the active_list of a
683 * processed instance is relinked to done_list_head before the callback
684 * is called.
685 */
686 list_for_each_safe(p, n, &timer->active_list_head) {
687 ti = list_entry(p, struct snd_timer_instance, active_list);
688 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
689 continue;
690 ti->pticks += ticks_left;
691 ti->resolution = resolution;
692 if (ti->cticks < ticks_left)
693 ti->cticks = 0;
694 else
695 ti->cticks -= ticks_left;
696 if (ti->cticks) /* not expired */
697 continue;
698 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
699 ti->cticks = ti->ticks;
700 } else {
701 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
702 if (--timer->running)
703 list_del(p);
704 }
705 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
706 (ti->flags & SNDRV_TIMER_IFLG_FAST))
707 ack_list_head = &timer->ack_list_head;
708 else
709 ack_list_head = &timer->sack_list_head;
710 if (list_empty(&ti->ack_list))
711 list_add_tail(&ti->ack_list, ack_list_head);
712 list_for_each(q, &ti->slave_active_head) {
713 ts = list_entry(q, struct snd_timer_instance, active_list);
714 ts->pticks = ti->pticks;
715 ts->resolution = resolution;
716 if (list_empty(&ts->ack_list))
717 list_add_tail(&ts->ack_list, ack_list_head);
718 }
719 }
720 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
721 snd_timer_reschedule(timer, ticks_left);
722 if (timer->running) {
723 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
724 timer->hw.stop(timer);
725 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
726 }
727 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
728 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
729 /* restart timer */
730 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
731 timer->hw.start(timer);
732 }
733 } else {
734 timer->hw.stop(timer);
735 }
736
737 /* now process all fast callbacks */
738 while (!list_empty(&timer->ack_list_head)) {
739 p = timer->ack_list_head.next; /* get first item */
740 ti = list_entry(p, struct snd_timer_instance, ack_list);
741
742 /* remove from ack_list and make empty */
743 list_del_init(p);
744
745 ticks = ti->pticks;
746 ti->pticks = 0;
747
748 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
749 spin_unlock(&timer->lock);
750 if (ti->callback)
751 ti->callback(ti, resolution, ticks);
752 spin_lock(&timer->lock);
753 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
754 }
755
756 /* do we have any slow callbacks? */
757 use_tasklet = !list_empty(&timer->sack_list_head);
758 spin_unlock_irqrestore(&timer->lock, flags);
759
760 if (use_tasklet)
761 tasklet_hi_schedule(&timer->task_queue);
762 }
763
764 /*
765
766 */
767
768 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
769 struct snd_timer **rtimer)
770 {
771 struct snd_timer *timer;
772 int err;
773 static struct snd_device_ops ops = {
774 .dev_free = snd_timer_dev_free,
775 .dev_register = snd_timer_dev_register,
776 .dev_unregister = snd_timer_dev_unregister
777 };
778
779 snd_assert(tid != NULL, return -EINVAL);
780 snd_assert(rtimer != NULL, return -EINVAL);
781 *rtimer = NULL;
782 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
783 if (timer == NULL) {
784 snd_printk(KERN_ERR "timer: cannot allocate\n");
785 return -ENOMEM;
786 }
787 timer->tmr_class = tid->dev_class;
788 timer->card = card;
789 timer->tmr_device = tid->device;
790 timer->tmr_subdevice = tid->subdevice;
791 if (id)
792 strlcpy(timer->id, id, sizeof(timer->id));
793 INIT_LIST_HEAD(&timer->device_list);
794 INIT_LIST_HEAD(&timer->open_list_head);
795 INIT_LIST_HEAD(&timer->active_list_head);
796 INIT_LIST_HEAD(&timer->ack_list_head);
797 INIT_LIST_HEAD(&timer->sack_list_head);
798 spin_lock_init(&timer->lock);
799 tasklet_init(&timer->task_queue, snd_timer_tasklet,
800 (unsigned long)timer);
801 if (card != NULL) {
802 timer->module = card->module;
803 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
804 if (err < 0) {
805 snd_timer_free(timer);
806 return err;
807 }
808 }
809 *rtimer = timer;
810 return 0;
811 }
812
813 static int snd_timer_free(struct snd_timer *timer)
814 {
815 snd_assert(timer != NULL, return -ENXIO);
816 if (timer->private_free)
817 timer->private_free(timer);
818 kfree(timer);
819 return 0;
820 }
821
822 static int snd_timer_dev_free(struct snd_device *device)
823 {
824 struct snd_timer *timer = device->device_data;
825 return snd_timer_free(timer);
826 }
827
828 static int snd_timer_dev_register(struct snd_device *dev)
829 {
830 struct snd_timer *timer = dev->device_data;
831 struct snd_timer *timer1;
832 struct list_head *p;
833
834 snd_assert(timer != NULL && timer->hw.start != NULL &&
835 timer->hw.stop != NULL, return -ENXIO);
836 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
837 !timer->hw.resolution && timer->hw.c_resolution == NULL)
838 return -EINVAL;
839
840 mutex_lock(&register_mutex);
841 list_for_each(p, &snd_timer_list) {
842 timer1 = list_entry(p, struct snd_timer, device_list);
843 if (timer1->tmr_class > timer->tmr_class)
844 break;
845 if (timer1->tmr_class < timer->tmr_class)
846 continue;
847 if (timer1->card && timer->card) {
848 if (timer1->card->number > timer->card->number)
849 break;
850 if (timer1->card->number < timer->card->number)
851 continue;
852 }
853 if (timer1->tmr_device > timer->tmr_device)
854 break;
855 if (timer1->tmr_device < timer->tmr_device)
856 continue;
857 if (timer1->tmr_subdevice > timer->tmr_subdevice)
858 break;
859 if (timer1->tmr_subdevice < timer->tmr_subdevice)
860 continue;
861 /* conflicts.. */
862 mutex_unlock(&register_mutex);
863 return -EBUSY;
864 }
865 list_add_tail(&timer->device_list, p);
866 mutex_unlock(&register_mutex);
867 return 0;
868 }
869
870 static int snd_timer_unregister(struct snd_timer *timer)
871 {
872 struct list_head *p, *n;
873 struct snd_timer_instance *ti;
874
875 snd_assert(timer != NULL, return -ENXIO);
876 mutex_lock(&register_mutex);
877 if (! list_empty(&timer->open_list_head)) {
878 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer);
879 list_for_each_safe(p, n, &timer->open_list_head) {
880 list_del_init(p);
881 ti = list_entry(p, struct snd_timer_instance, open_list);
882 ti->timer = NULL;
883 }
884 }
885 list_del(&timer->device_list);
886 mutex_unlock(&register_mutex);
887 return snd_timer_free(timer);
888 }
889
890 static int snd_timer_dev_unregister(struct snd_device *device)
891 {
892 struct snd_timer *timer = device->device_data;
893 return snd_timer_unregister(timer);
894 }
895
896 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
897 {
898 unsigned long flags;
899 unsigned long resolution = 0;
900 struct snd_timer_instance *ti, *ts;
901 struct list_head *p, *n;
902
903 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
904 return;
905 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART &&
906 event <= SNDRV_TIMER_EVENT_MRESUME, return);
907 spin_lock_irqsave(&timer->lock, flags);
908 if (event == SNDRV_TIMER_EVENT_MSTART ||
909 event == SNDRV_TIMER_EVENT_MCONTINUE ||
910 event == SNDRV_TIMER_EVENT_MRESUME) {
911 if (timer->hw.c_resolution)
912 resolution = timer->hw.c_resolution(timer);
913 else
914 resolution = timer->hw.resolution;
915 }
916 list_for_each(p, &timer->active_list_head) {
917 ti = list_entry(p, struct snd_timer_instance, active_list);
918 if (ti->ccallback)
919 ti->ccallback(ti, event, tstamp, resolution);
920 list_for_each(n, &ti->slave_active_head) {
921 ts = list_entry(n, struct snd_timer_instance, active_list);
922 if (ts->ccallback)
923 ts->ccallback(ts, event, tstamp, resolution);
924 }
925 }
926 spin_unlock_irqrestore(&timer->lock, flags);
927 }
928
929 /*
930 * exported functions for global timers
931 */
932 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
933 {
934 struct snd_timer_id tid;
935
936 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
937 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
938 tid.card = -1;
939 tid.device = device;
940 tid.subdevice = 0;
941 return snd_timer_new(NULL, id, &tid, rtimer);
942 }
943
944 int snd_timer_global_free(struct snd_timer *timer)
945 {
946 return snd_timer_free(timer);
947 }
948
949 int snd_timer_global_register(struct snd_timer *timer)
950 {
951 struct snd_device dev;
952
953 memset(&dev, 0, sizeof(dev));
954 dev.device_data = timer;
955 return snd_timer_dev_register(&dev);
956 }
957
958 int snd_timer_global_unregister(struct snd_timer *timer)
959 {
960 return snd_timer_unregister(timer);
961 }
962
963 /*
964 * System timer
965 */
966
967 struct snd_timer_system_private {
968 struct timer_list tlist;
969 struct timer * timer;
970 unsigned long last_expires;
971 unsigned long last_jiffies;
972 unsigned long correction;
973 };
974
975 static void snd_timer_s_function(unsigned long data)
976 {
977 struct snd_timer *timer = (struct snd_timer *)data;
978 struct snd_timer_system_private *priv = timer->private_data;
979 unsigned long jiff = jiffies;
980 if (time_after(jiff, priv->last_expires))
981 priv->correction = (long)jiff - (long)priv->last_expires;
982 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
983 }
984
985 static int snd_timer_s_start(struct snd_timer * timer)
986 {
987 struct snd_timer_system_private *priv;
988 unsigned long njiff;
989
990 priv = (struct snd_timer_system_private *) timer->private_data;
991 njiff = (priv->last_jiffies = jiffies);
992 if (priv->correction > timer->sticks - 1) {
993 priv->correction -= timer->sticks - 1;
994 njiff++;
995 } else {
996 njiff += timer->sticks - priv->correction;
997 priv->correction -= timer->sticks;
998 }
999 priv->last_expires = priv->tlist.expires = njiff;
1000 add_timer(&priv->tlist);
1001 return 0;
1002 }
1003
1004 static int snd_timer_s_stop(struct snd_timer * timer)
1005 {
1006 struct snd_timer_system_private *priv;
1007 unsigned long jiff;
1008
1009 priv = (struct snd_timer_system_private *) timer->private_data;
1010 del_timer(&priv->tlist);
1011 jiff = jiffies;
1012 if (time_before(jiff, priv->last_expires))
1013 timer->sticks = priv->last_expires - jiff;
1014 else
1015 timer->sticks = 1;
1016 return 0;
1017 }
1018
1019 static struct snd_timer_hardware snd_timer_system =
1020 {
1021 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1022 .resolution = 1000000000L / HZ,
1023 .ticks = 10000000L,
1024 .start = snd_timer_s_start,
1025 .stop = snd_timer_s_stop
1026 };
1027
1028 static void snd_timer_free_system(struct snd_timer *timer)
1029 {
1030 kfree(timer->private_data);
1031 }
1032
1033 static int snd_timer_register_system(void)
1034 {
1035 struct snd_timer *timer;
1036 struct snd_timer_system_private *priv;
1037 int err;
1038
1039 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1040 if (err < 0)
1041 return err;
1042 strcpy(timer->name, "system timer");
1043 timer->hw = snd_timer_system;
1044 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1045 if (priv == NULL) {
1046 snd_timer_free(timer);
1047 return -ENOMEM;
1048 }
1049 init_timer(&priv->tlist);
1050 priv->tlist.function = snd_timer_s_function;
1051 priv->tlist.data = (unsigned long) timer;
1052 timer->private_data = priv;
1053 timer->private_free = snd_timer_free_system;
1054 return snd_timer_global_register(timer);
1055 }
1056
1057 #ifdef CONFIG_PROC_FS
1058 /*
1059 * Info interface
1060 */
1061
1062 static void snd_timer_proc_read(struct snd_info_entry *entry,
1063 struct snd_info_buffer *buffer)
1064 {
1065 struct snd_timer *timer;
1066 struct snd_timer_instance *ti;
1067 struct list_head *p, *q;
1068
1069 mutex_lock(&register_mutex);
1070 list_for_each(p, &snd_timer_list) {
1071 timer = list_entry(p, struct snd_timer, device_list);
1072 switch (timer->tmr_class) {
1073 case SNDRV_TIMER_CLASS_GLOBAL:
1074 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1075 break;
1076 case SNDRV_TIMER_CLASS_CARD:
1077 snd_iprintf(buffer, "C%i-%i: ",
1078 timer->card->number, timer->tmr_device);
1079 break;
1080 case SNDRV_TIMER_CLASS_PCM:
1081 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1082 timer->tmr_device, timer->tmr_subdevice);
1083 break;
1084 default:
1085 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1086 timer->card ? timer->card->number : -1,
1087 timer->tmr_device, timer->tmr_subdevice);
1088 }
1089 snd_iprintf(buffer, "%s :", timer->name);
1090 if (timer->hw.resolution)
1091 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1092 timer->hw.resolution / 1000,
1093 timer->hw.resolution % 1000,
1094 timer->hw.ticks);
1095 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1096 snd_iprintf(buffer, " SLAVE");
1097 snd_iprintf(buffer, "\n");
1098 list_for_each(q, &timer->open_list_head) {
1099 ti = list_entry(q, struct snd_timer_instance, open_list);
1100 snd_iprintf(buffer, " Client %s : %s\n",
1101 ti->owner ? ti->owner : "unknown",
1102 ti->flags & (SNDRV_TIMER_IFLG_START |
1103 SNDRV_TIMER_IFLG_RUNNING)
1104 ? "running" : "stopped");
1105 }
1106 }
1107 mutex_unlock(&register_mutex);
1108 }
1109
1110 static struct snd_info_entry *snd_timer_proc_entry;
1111
1112 static void __init snd_timer_proc_init(void)
1113 {
1114 struct snd_info_entry *entry;
1115
1116 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1117 if (entry != NULL) {
1118 entry->c.text.read = snd_timer_proc_read;
1119 if (snd_info_register(entry) < 0) {
1120 snd_info_free_entry(entry);
1121 entry = NULL;
1122 }
1123 }
1124 snd_timer_proc_entry = entry;
1125 }
1126
1127 static void __exit snd_timer_proc_done(void)
1128 {
1129 snd_info_unregister(snd_timer_proc_entry);
1130 }
1131 #else /* !CONFIG_PROC_FS */
1132 #define snd_timer_proc_init()
1133 #define snd_timer_proc_done()
1134 #endif
1135
1136 /*
1137 * USER SPACE interface
1138 */
1139
1140 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1141 unsigned long resolution,
1142 unsigned long ticks)
1143 {
1144 struct snd_timer_user *tu = timeri->callback_data;
1145 struct snd_timer_read *r;
1146 int prev;
1147
1148 spin_lock(&tu->qlock);
1149 if (tu->qused > 0) {
1150 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1151 r = &tu->queue[prev];
1152 if (r->resolution == resolution) {
1153 r->ticks += ticks;
1154 goto __wake;
1155 }
1156 }
1157 if (tu->qused >= tu->queue_size) {
1158 tu->overrun++;
1159 } else {
1160 r = &tu->queue[tu->qtail++];
1161 tu->qtail %= tu->queue_size;
1162 r->resolution = resolution;
1163 r->ticks = ticks;
1164 tu->qused++;
1165 }
1166 __wake:
1167 spin_unlock(&tu->qlock);
1168 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1169 wake_up(&tu->qchange_sleep);
1170 }
1171
1172 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1173 struct snd_timer_tread *tread)
1174 {
1175 if (tu->qused >= tu->queue_size) {
1176 tu->overrun++;
1177 } else {
1178 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1179 tu->qtail %= tu->queue_size;
1180 tu->qused++;
1181 }
1182 }
1183
1184 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1185 int event,
1186 struct timespec *tstamp,
1187 unsigned long resolution)
1188 {
1189 struct snd_timer_user *tu = timeri->callback_data;
1190 struct snd_timer_tread r1;
1191
1192 if (event >= SNDRV_TIMER_EVENT_START &&
1193 event <= SNDRV_TIMER_EVENT_PAUSE)
1194 tu->tstamp = *tstamp;
1195 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1196 return;
1197 r1.event = event;
1198 r1.tstamp = *tstamp;
1199 r1.val = resolution;
1200 spin_lock(&tu->qlock);
1201 snd_timer_user_append_to_tqueue(tu, &r1);
1202 spin_unlock(&tu->qlock);
1203 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1204 wake_up(&tu->qchange_sleep);
1205 }
1206
1207 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1208 unsigned long resolution,
1209 unsigned long ticks)
1210 {
1211 struct snd_timer_user *tu = timeri->callback_data;
1212 struct snd_timer_tread *r, r1;
1213 struct timespec tstamp;
1214 int prev, append = 0;
1215
1216 memset(&tstamp, 0, sizeof(tstamp));
1217 spin_lock(&tu->qlock);
1218 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1219 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1220 spin_unlock(&tu->qlock);
1221 return;
1222 }
1223 if (tu->last_resolution != resolution || ticks > 0)
1224 getnstimeofday(&tstamp);
1225 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1226 tu->last_resolution != resolution) {
1227 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1228 r1.tstamp = tstamp;
1229 r1.val = resolution;
1230 snd_timer_user_append_to_tqueue(tu, &r1);
1231 tu->last_resolution = resolution;
1232 append++;
1233 }
1234 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1235 goto __wake;
1236 if (ticks == 0)
1237 goto __wake;
1238 if (tu->qused > 0) {
1239 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1240 r = &tu->tqueue[prev];
1241 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1242 r->tstamp = tstamp;
1243 r->val += ticks;
1244 append++;
1245 goto __wake;
1246 }
1247 }
1248 r1.event = SNDRV_TIMER_EVENT_TICK;
1249 r1.tstamp = tstamp;
1250 r1.val = ticks;
1251 snd_timer_user_append_to_tqueue(tu, &r1);
1252 append++;
1253 __wake:
1254 spin_unlock(&tu->qlock);
1255 if (append == 0)
1256 return;
1257 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1258 wake_up(&tu->qchange_sleep);
1259 }
1260
1261 static int snd_timer_user_open(struct inode *inode, struct file *file)
1262 {
1263 struct snd_timer_user *tu;
1264
1265 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1266 if (tu == NULL)
1267 return -ENOMEM;
1268 spin_lock_init(&tu->qlock);
1269 init_waitqueue_head(&tu->qchange_sleep);
1270 mutex_init(&tu->tread_sem);
1271 tu->ticks = 1;
1272 tu->queue_size = 128;
1273 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1274 GFP_KERNEL);
1275 if (tu->queue == NULL) {
1276 kfree(tu);
1277 return -ENOMEM;
1278 }
1279 file->private_data = tu;
1280 return 0;
1281 }
1282
1283 static int snd_timer_user_release(struct inode *inode, struct file *file)
1284 {
1285 struct snd_timer_user *tu;
1286
1287 if (file->private_data) {
1288 tu = file->private_data;
1289 file->private_data = NULL;
1290 fasync_helper(-1, file, 0, &tu->fasync);
1291 if (tu->timeri)
1292 snd_timer_close(tu->timeri);
1293 kfree(tu->queue);
1294 kfree(tu->tqueue);
1295 kfree(tu);
1296 }
1297 return 0;
1298 }
1299
1300 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1301 {
1302 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1303 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1304 id->card = -1;
1305 id->device = -1;
1306 id->subdevice = -1;
1307 }
1308
1309 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1310 {
1311 id->dev_class = timer->tmr_class;
1312 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1313 id->card = timer->card ? timer->card->number : -1;
1314 id->device = timer->tmr_device;
1315 id->subdevice = timer->tmr_subdevice;
1316 }
1317
1318 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1319 {
1320 struct snd_timer_id id;
1321 struct snd_timer *timer;
1322 struct list_head *p;
1323
1324 if (copy_from_user(&id, _tid, sizeof(id)))
1325 return -EFAULT;
1326 mutex_lock(&register_mutex);
1327 if (id.dev_class < 0) { /* first item */
1328 if (list_empty(&snd_timer_list))
1329 snd_timer_user_zero_id(&id);
1330 else {
1331 timer = list_entry(snd_timer_list.next,
1332 struct snd_timer, device_list);
1333 snd_timer_user_copy_id(&id, timer);
1334 }
1335 } else {
1336 switch (id.dev_class) {
1337 case SNDRV_TIMER_CLASS_GLOBAL:
1338 id.device = id.device < 0 ? 0 : id.device + 1;
1339 list_for_each(p, &snd_timer_list) {
1340 timer = list_entry(p, struct snd_timer, device_list);
1341 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1342 snd_timer_user_copy_id(&id, timer);
1343 break;
1344 }
1345 if (timer->tmr_device >= id.device) {
1346 snd_timer_user_copy_id(&id, timer);
1347 break;
1348 }
1349 }
1350 if (p == &snd_timer_list)
1351 snd_timer_user_zero_id(&id);
1352 break;
1353 case SNDRV_TIMER_CLASS_CARD:
1354 case SNDRV_TIMER_CLASS_PCM:
1355 if (id.card < 0) {
1356 id.card = 0;
1357 } else {
1358 if (id.card < 0) {
1359 id.card = 0;
1360 } else {
1361 if (id.device < 0) {
1362 id.device = 0;
1363 } else {
1364 if (id.subdevice < 0) {
1365 id.subdevice = 0;
1366 } else {
1367 id.subdevice++;
1368 }
1369 }
1370 }
1371 }
1372 list_for_each(p, &snd_timer_list) {
1373 timer = list_entry(p, struct snd_timer, device_list);
1374 if (timer->tmr_class > id.dev_class) {
1375 snd_timer_user_copy_id(&id, timer);
1376 break;
1377 }
1378 if (timer->tmr_class < id.dev_class)
1379 continue;
1380 if (timer->card->number > id.card) {
1381 snd_timer_user_copy_id(&id, timer);
1382 break;
1383 }
1384 if (timer->card->number < id.card)
1385 continue;
1386 if (timer->tmr_device > id.device) {
1387 snd_timer_user_copy_id(&id, timer);
1388 break;
1389 }
1390 if (timer->tmr_device < id.device)
1391 continue;
1392 if (timer->tmr_subdevice > id.subdevice) {
1393 snd_timer_user_copy_id(&id, timer);
1394 break;
1395 }
1396 if (timer->tmr_subdevice < id.subdevice)
1397 continue;
1398 snd_timer_user_copy_id(&id, timer);
1399 break;
1400 }
1401 if (p == &snd_timer_list)
1402 snd_timer_user_zero_id(&id);
1403 break;
1404 default:
1405 snd_timer_user_zero_id(&id);
1406 }
1407 }
1408 mutex_unlock(&register_mutex);
1409 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1410 return -EFAULT;
1411 return 0;
1412 }
1413
1414 static int snd_timer_user_ginfo(struct file *file,
1415 struct snd_timer_ginfo __user *_ginfo)
1416 {
1417 struct snd_timer_ginfo *ginfo;
1418 struct snd_timer_id tid;
1419 struct snd_timer *t;
1420 struct list_head *p;
1421 int err = 0;
1422
1423 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1424 if (! ginfo)
1425 return -ENOMEM;
1426 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1427 kfree(ginfo);
1428 return -EFAULT;
1429 }
1430 tid = ginfo->tid;
1431 memset(ginfo, 0, sizeof(*ginfo));
1432 ginfo->tid = tid;
1433 mutex_lock(&register_mutex);
1434 t = snd_timer_find(&tid);
1435 if (t != NULL) {
1436 ginfo->card = t->card ? t->card->number : -1;
1437 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1438 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1439 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1440 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1441 ginfo->resolution = t->hw.resolution;
1442 if (t->hw.resolution_min > 0) {
1443 ginfo->resolution_min = t->hw.resolution_min;
1444 ginfo->resolution_max = t->hw.resolution_max;
1445 }
1446 list_for_each(p, &t->open_list_head) {
1447 ginfo->clients++;
1448 }
1449 } else {
1450 err = -ENODEV;
1451 }
1452 mutex_unlock(&register_mutex);
1453 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1454 err = -EFAULT;
1455 kfree(ginfo);
1456 return err;
1457 }
1458
1459 static int snd_timer_user_gparams(struct file *file,
1460 struct snd_timer_gparams __user *_gparams)
1461 {
1462 struct snd_timer_gparams gparams;
1463 struct snd_timer *t;
1464 int err;
1465
1466 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1467 return -EFAULT;
1468 mutex_lock(&register_mutex);
1469 t = snd_timer_find(&gparams.tid);
1470 if (!t) {
1471 err = -ENODEV;
1472 goto _error;
1473 }
1474 if (!list_empty(&t->open_list_head)) {
1475 err = -EBUSY;
1476 goto _error;
1477 }
1478 if (!t->hw.set_period) {
1479 err = -ENOSYS;
1480 goto _error;
1481 }
1482 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1483 _error:
1484 mutex_unlock(&register_mutex);
1485 return err;
1486 }
1487
1488 static int snd_timer_user_gstatus(struct file *file,
1489 struct snd_timer_gstatus __user *_gstatus)
1490 {
1491 struct snd_timer_gstatus gstatus;
1492 struct snd_timer_id tid;
1493 struct snd_timer *t;
1494 int err = 0;
1495
1496 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1497 return -EFAULT;
1498 tid = gstatus.tid;
1499 memset(&gstatus, 0, sizeof(gstatus));
1500 gstatus.tid = tid;
1501 mutex_lock(&register_mutex);
1502 t = snd_timer_find(&tid);
1503 if (t != NULL) {
1504 if (t->hw.c_resolution)
1505 gstatus.resolution = t->hw.c_resolution(t);
1506 else
1507 gstatus.resolution = t->hw.resolution;
1508 if (t->hw.precise_resolution) {
1509 t->hw.precise_resolution(t, &gstatus.resolution_num,
1510 &gstatus.resolution_den);
1511 } else {
1512 gstatus.resolution_num = gstatus.resolution;
1513 gstatus.resolution_den = 1000000000uL;
1514 }
1515 } else {
1516 err = -ENODEV;
1517 }
1518 mutex_unlock(&register_mutex);
1519 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1520 err = -EFAULT;
1521 return err;
1522 }
1523
1524 static int snd_timer_user_tselect(struct file *file,
1525 struct snd_timer_select __user *_tselect)
1526 {
1527 struct snd_timer_user *tu;
1528 struct snd_timer_select tselect;
1529 char str[32];
1530 int err = 0;
1531
1532 tu = file->private_data;
1533 mutex_lock(&tu->tread_sem);
1534 if (tu->timeri) {
1535 snd_timer_close(tu->timeri);
1536 tu->timeri = NULL;
1537 }
1538 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1539 err = -EFAULT;
1540 goto __err;
1541 }
1542 sprintf(str, "application %i", current->pid);
1543 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1544 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1545 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1546 if (err < 0)
1547 goto __err;
1548
1549 kfree(tu->queue);
1550 tu->queue = NULL;
1551 kfree(tu->tqueue);
1552 tu->tqueue = NULL;
1553 if (tu->tread) {
1554 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1555 GFP_KERNEL);
1556 if (tu->tqueue == NULL)
1557 err = -ENOMEM;
1558 } else {
1559 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1560 GFP_KERNEL);
1561 if (tu->queue == NULL)
1562 err = -ENOMEM;
1563 }
1564
1565 if (err < 0) {
1566 snd_timer_close(tu->timeri);
1567 tu->timeri = NULL;
1568 } else {
1569 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1570 tu->timeri->callback = tu->tread
1571 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1572 tu->timeri->ccallback = snd_timer_user_ccallback;
1573 tu->timeri->callback_data = (void *)tu;
1574 }
1575
1576 __err:
1577 mutex_unlock(&tu->tread_sem);
1578 return err;
1579 }
1580
1581 static int snd_timer_user_info(struct file *file,
1582 struct snd_timer_info __user *_info)
1583 {
1584 struct snd_timer_user *tu;
1585 struct snd_timer_info *info;
1586 struct snd_timer *t;
1587 int err = 0;
1588
1589 tu = file->private_data;
1590 snd_assert(tu->timeri != NULL, return -ENXIO);
1591 t = tu->timeri->timer;
1592 snd_assert(t != NULL, return -ENXIO);
1593
1594 info = kzalloc(sizeof(*info), GFP_KERNEL);
1595 if (! info)
1596 return -ENOMEM;
1597 info->card = t->card ? t->card->number : -1;
1598 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1599 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1600 strlcpy(info->id, t->id, sizeof(info->id));
1601 strlcpy(info->name, t->name, sizeof(info->name));
1602 info->resolution = t->hw.resolution;
1603 if (copy_to_user(_info, info, sizeof(*_info)))
1604 err = -EFAULT;
1605 kfree(info);
1606 return err;
1607 }
1608
1609 static int snd_timer_user_params(struct file *file,
1610 struct snd_timer_params __user *_params)
1611 {
1612 struct snd_timer_user *tu;
1613 struct snd_timer_params params;
1614 struct snd_timer *t;
1615 struct snd_timer_read *tr;
1616 struct snd_timer_tread *ttr;
1617 int err;
1618
1619 tu = file->private_data;
1620 snd_assert(tu->timeri != NULL, return -ENXIO);
1621 t = tu->timeri->timer;
1622 snd_assert(t != NULL, return -ENXIO);
1623 if (copy_from_user(&params, _params, sizeof(params)))
1624 return -EFAULT;
1625 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1626 err = -EINVAL;
1627 goto _end;
1628 }
1629 if (params.queue_size > 0 &&
1630 (params.queue_size < 32 || params.queue_size > 1024)) {
1631 err = -EINVAL;
1632 goto _end;
1633 }
1634 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1635 (1<<SNDRV_TIMER_EVENT_TICK)|
1636 (1<<SNDRV_TIMER_EVENT_START)|
1637 (1<<SNDRV_TIMER_EVENT_STOP)|
1638 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1639 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1640 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1641 (1<<SNDRV_TIMER_EVENT_RESUME)|
1642 (1<<SNDRV_TIMER_EVENT_MSTART)|
1643 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1644 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1645 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1646 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1647 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1648 err = -EINVAL;
1649 goto _end;
1650 }
1651 snd_timer_stop(tu->timeri);
1652 spin_lock_irq(&t->lock);
1653 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1654 SNDRV_TIMER_IFLG_EXCLUSIVE|
1655 SNDRV_TIMER_IFLG_EARLY_EVENT);
1656 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1657 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1658 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1659 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1660 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1661 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1662 spin_unlock_irq(&t->lock);
1663 if (params.queue_size > 0 &&
1664 (unsigned int)tu->queue_size != params.queue_size) {
1665 if (tu->tread) {
1666 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1667 GFP_KERNEL);
1668 if (ttr) {
1669 kfree(tu->tqueue);
1670 tu->queue_size = params.queue_size;
1671 tu->tqueue = ttr;
1672 }
1673 } else {
1674 tr = kmalloc(params.queue_size * sizeof(*tr),
1675 GFP_KERNEL);
1676 if (tr) {
1677 kfree(tu->queue);
1678 tu->queue_size = params.queue_size;
1679 tu->queue = tr;
1680 }
1681 }
1682 }
1683 tu->qhead = tu->qtail = tu->qused = 0;
1684 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1685 if (tu->tread) {
1686 struct snd_timer_tread tread;
1687 tread.event = SNDRV_TIMER_EVENT_EARLY;
1688 tread.tstamp.tv_sec = 0;
1689 tread.tstamp.tv_nsec = 0;
1690 tread.val = 0;
1691 snd_timer_user_append_to_tqueue(tu, &tread);
1692 } else {
1693 struct snd_timer_read *r = &tu->queue[0];
1694 r->resolution = 0;
1695 r->ticks = 0;
1696 tu->qused++;
1697 tu->qtail++;
1698 }
1699 }
1700 tu->filter = params.filter;
1701 tu->ticks = params.ticks;
1702 err = 0;
1703 _end:
1704 if (copy_to_user(_params, &params, sizeof(params)))
1705 return -EFAULT;
1706 return err;
1707 }
1708
1709 static int snd_timer_user_status(struct file *file,
1710 struct snd_timer_status __user *_status)
1711 {
1712 struct snd_timer_user *tu;
1713 struct snd_timer_status status;
1714
1715 tu = file->private_data;
1716 snd_assert(tu->timeri != NULL, return -ENXIO);
1717 memset(&status, 0, sizeof(status));
1718 status.tstamp = tu->tstamp;
1719 status.resolution = snd_timer_resolution(tu->timeri);
1720 status.lost = tu->timeri->lost;
1721 status.overrun = tu->overrun;
1722 spin_lock_irq(&tu->qlock);
1723 status.queue = tu->qused;
1724 spin_unlock_irq(&tu->qlock);
1725 if (copy_to_user(_status, &status, sizeof(status)))
1726 return -EFAULT;
1727 return 0;
1728 }
1729
1730 static int snd_timer_user_start(struct file *file)
1731 {
1732 int err;
1733 struct snd_timer_user *tu;
1734
1735 tu = file->private_data;
1736 snd_assert(tu->timeri != NULL, return -ENXIO);
1737 snd_timer_stop(tu->timeri);
1738 tu->timeri->lost = 0;
1739 tu->last_resolution = 0;
1740 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1741 }
1742
1743 static int snd_timer_user_stop(struct file *file)
1744 {
1745 int err;
1746 struct snd_timer_user *tu;
1747
1748 tu = file->private_data;
1749 snd_assert(tu->timeri != NULL, return -ENXIO);
1750 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1751 }
1752
1753 static int snd_timer_user_continue(struct file *file)
1754 {
1755 int err;
1756 struct snd_timer_user *tu;
1757
1758 tu = file->private_data;
1759 snd_assert(tu->timeri != NULL, return -ENXIO);
1760 tu->timeri->lost = 0;
1761 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1762 }
1763
1764 static int snd_timer_user_pause(struct file *file)
1765 {
1766 int err;
1767 struct snd_timer_user *tu;
1768
1769 tu = file->private_data;
1770 snd_assert(tu->timeri != NULL, return -ENXIO);
1771 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1772 }
1773
1774 enum {
1775 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1776 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1777 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1778 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1779 };
1780
1781 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1782 unsigned long arg)
1783 {
1784 struct snd_timer_user *tu;
1785 void __user *argp = (void __user *)arg;
1786 int __user *p = argp;
1787
1788 tu = file->private_data;
1789 switch (cmd) {
1790 case SNDRV_TIMER_IOCTL_PVERSION:
1791 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1792 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1793 return snd_timer_user_next_device(argp);
1794 case SNDRV_TIMER_IOCTL_TREAD:
1795 {
1796 int xarg;
1797
1798 mutex_lock(&tu->tread_sem);
1799 if (tu->timeri) { /* too late */
1800 mutex_unlock(&tu->tread_sem);
1801 return -EBUSY;
1802 }
1803 if (get_user(xarg, p)) {
1804 mutex_unlock(&tu->tread_sem);
1805 return -EFAULT;
1806 }
1807 tu->tread = xarg ? 1 : 0;
1808 mutex_unlock(&tu->tread_sem);
1809 return 0;
1810 }
1811 case SNDRV_TIMER_IOCTL_GINFO:
1812 return snd_timer_user_ginfo(file, argp);
1813 case SNDRV_TIMER_IOCTL_GPARAMS:
1814 return snd_timer_user_gparams(file, argp);
1815 case SNDRV_TIMER_IOCTL_GSTATUS:
1816 return snd_timer_user_gstatus(file, argp);
1817 case SNDRV_TIMER_IOCTL_SELECT:
1818 return snd_timer_user_tselect(file, argp);
1819 case SNDRV_TIMER_IOCTL_INFO:
1820 return snd_timer_user_info(file, argp);
1821 case SNDRV_TIMER_IOCTL_PARAMS:
1822 return snd_timer_user_params(file, argp);
1823 case SNDRV_TIMER_IOCTL_STATUS:
1824 return snd_timer_user_status(file, argp);
1825 case SNDRV_TIMER_IOCTL_START:
1826 case SNDRV_TIMER_IOCTL_START_OLD:
1827 return snd_timer_user_start(file);
1828 case SNDRV_TIMER_IOCTL_STOP:
1829 case SNDRV_TIMER_IOCTL_STOP_OLD:
1830 return snd_timer_user_stop(file);
1831 case SNDRV_TIMER_IOCTL_CONTINUE:
1832 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1833 return snd_timer_user_continue(file);
1834 case SNDRV_TIMER_IOCTL_PAUSE:
1835 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1836 return snd_timer_user_pause(file);
1837 }
1838 return -ENOTTY;
1839 }
1840
1841 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1842 {
1843 struct snd_timer_user *tu;
1844 int err;
1845
1846 tu = file->private_data;
1847 err = fasync_helper(fd, file, on, &tu->fasync);
1848 if (err < 0)
1849 return err;
1850 return 0;
1851 }
1852
1853 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1854 size_t count, loff_t *offset)
1855 {
1856 struct snd_timer_user *tu;
1857 long result = 0, unit;
1858 int err = 0;
1859
1860 tu = file->private_data;
1861 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1862 spin_lock_irq(&tu->qlock);
1863 while ((long)count - result >= unit) {
1864 while (!tu->qused) {
1865 wait_queue_t wait;
1866
1867 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1868 err = -EAGAIN;
1869 break;
1870 }
1871
1872 set_current_state(TASK_INTERRUPTIBLE);
1873 init_waitqueue_entry(&wait, current);
1874 add_wait_queue(&tu->qchange_sleep, &wait);
1875
1876 spin_unlock_irq(&tu->qlock);
1877 schedule();
1878 spin_lock_irq(&tu->qlock);
1879
1880 remove_wait_queue(&tu->qchange_sleep, &wait);
1881
1882 if (signal_pending(current)) {
1883 err = -ERESTARTSYS;
1884 break;
1885 }
1886 }
1887
1888 spin_unlock_irq(&tu->qlock);
1889 if (err < 0)
1890 goto _error;
1891
1892 if (tu->tread) {
1893 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1894 sizeof(struct snd_timer_tread))) {
1895 err = -EFAULT;
1896 goto _error;
1897 }
1898 } else {
1899 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1900 sizeof(struct snd_timer_read))) {
1901 err = -EFAULT;
1902 goto _error;
1903 }
1904 }
1905
1906 tu->qhead %= tu->queue_size;
1907
1908 result += unit;
1909 buffer += unit;
1910
1911 spin_lock_irq(&tu->qlock);
1912 tu->qused--;
1913 }
1914 spin_unlock_irq(&tu->qlock);
1915 _error:
1916 return result > 0 ? result : err;
1917 }
1918
1919 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1920 {
1921 unsigned int mask;
1922 struct snd_timer_user *tu;
1923
1924 tu = file->private_data;
1925
1926 poll_wait(file, &tu->qchange_sleep, wait);
1927
1928 mask = 0;
1929 if (tu->qused)
1930 mask |= POLLIN | POLLRDNORM;
1931
1932 return mask;
1933 }
1934
1935 #ifdef CONFIG_COMPAT
1936 #include "timer_compat.c"
1937 #else
1938 #define snd_timer_user_ioctl_compat NULL
1939 #endif
1940
1941 static struct file_operations snd_timer_f_ops =
1942 {
1943 .owner = THIS_MODULE,
1944 .read = snd_timer_user_read,
1945 .open = snd_timer_user_open,
1946 .release = snd_timer_user_release,
1947 .poll = snd_timer_user_poll,
1948 .unlocked_ioctl = snd_timer_user_ioctl,
1949 .compat_ioctl = snd_timer_user_ioctl_compat,
1950 .fasync = snd_timer_user_fasync,
1951 };
1952
1953 /*
1954 * ENTRY functions
1955 */
1956
1957 static int __init alsa_timer_init(void)
1958 {
1959 int err;
1960
1961 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1962 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1963 "system timer");
1964 #endif
1965
1966 if ((err = snd_timer_register_system()) < 0)
1967 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1968 err);
1969 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1970 &snd_timer_f_ops, NULL, "timer")) < 0)
1971 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1972 err);
1973 snd_timer_proc_init();
1974 return 0;
1975 }
1976
1977 static void __exit alsa_timer_exit(void)
1978 {
1979 struct list_head *p, *n;
1980
1981 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1982 /* unregister the system timer */
1983 list_for_each_safe(p, n, &snd_timer_list) {
1984 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1985 snd_timer_unregister(timer);
1986 }
1987 snd_timer_proc_done();
1988 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1989 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1990 #endif
1991 }
1992
1993 module_init(alsa_timer_init)
1994 module_exit(alsa_timer_exit)
1995
1996 EXPORT_SYMBOL(snd_timer_open);
1997 EXPORT_SYMBOL(snd_timer_close);
1998 EXPORT_SYMBOL(snd_timer_resolution);
1999 EXPORT_SYMBOL(snd_timer_start);
2000 EXPORT_SYMBOL(snd_timer_stop);
2001 EXPORT_SYMBOL(snd_timer_continue);
2002 EXPORT_SYMBOL(snd_timer_pause);
2003 EXPORT_SYMBOL(snd_timer_new);
2004 EXPORT_SYMBOL(snd_timer_notify);
2005 EXPORT_SYMBOL(snd_timer_global_new);
2006 EXPORT_SYMBOL(snd_timer_global_free);
2007 EXPORT_SYMBOL(snd_timer_global_register);
2008 EXPORT_SYMBOL(snd_timer_global_unregister);
2009 EXPORT_SYMBOL(snd_timer_interrupt);
Software Suspend 2 for 2.6.18.y (mirror)