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[SCTP]: Prevent possible infinite recursion with multiple bundled DATA.
[linux-2.6/mini2440.git] / sound / core / timer.c
blobcdeeb639b675a3e35a532b68a90443fced7e49f7
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
632 spin_lock(&timer->lock);
633 /* now process all callbacks */
634 while (!list_empty(&timer->sack_list_head)) {
635 p = timer->sack_list_head.next; /* get first item */
636 ti = list_entry(p, struct snd_timer_instance, ack_list);
637
638 /* remove from ack_list and make empty */
639 list_del_init(p);
640
641 ticks = ti->pticks;
642 ti->pticks = 0;
643 resolution = ti->resolution;
644
645 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
646 spin_unlock(&timer->lock);
647 if (ti->callback)
648 ti->callback(ti, resolution, ticks);
649 spin_lock(&timer->lock);
650 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
651 }
652 spin_unlock(&timer->lock);
653 }
654
655 /*
656 * timer interrupt
657 *
658 * ticks_left is usually equal to timer->sticks.
659 *
660 */
661 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
662 {
663 struct snd_timer_instance *ti, *ts;
664 unsigned long resolution, ticks;
665 struct list_head *p, *q, *n, *ack_list_head;
666 unsigned long flags;
667 int use_tasklet = 0;
668
669 if (timer == NULL)
670 return;
671
672 spin_lock_irqsave(&timer->lock, flags);
673
674 /* remember the current resolution */
675 if (timer->hw.c_resolution)
676 resolution = timer->hw.c_resolution(timer);
677 else
678 resolution = timer->hw.resolution;
679
680 /* loop for all active instances
681 * Here we cannot use list_for_each because the active_list of a
682 * processed instance is relinked to done_list_head before the callback
683 * is called.
684 */
685 list_for_each_safe(p, n, &timer->active_list_head) {
686 ti = list_entry(p, struct snd_timer_instance, active_list);
687 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
688 continue;
689 ti->pticks += ticks_left;
690 ti->resolution = resolution;
691 if (ti->cticks < ticks_left)
692 ti->cticks = 0;
693 else
694 ti->cticks -= ticks_left;
695 if (ti->cticks) /* not expired */
696 continue;
697 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
698 ti->cticks = ti->ticks;
699 } else {
700 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
701 if (--timer->running)
702 list_del(p);
703 }
704 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
705 (ti->flags & SNDRV_TIMER_IFLG_FAST))
706 ack_list_head = &timer->ack_list_head;
707 else
708 ack_list_head = &timer->sack_list_head;
709 if (list_empty(&ti->ack_list))
710 list_add_tail(&ti->ack_list, ack_list_head);
711 list_for_each(q, &ti->slave_active_head) {
712 ts = list_entry(q, struct snd_timer_instance, active_list);
713 ts->pticks = ti->pticks;
714 ts->resolution = resolution;
715 if (list_empty(&ts->ack_list))
716 list_add_tail(&ts->ack_list, ack_list_head);
717 }
718 }
719 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
720 snd_timer_reschedule(timer, ticks_left);
721 if (timer->running) {
722 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
723 timer->hw.stop(timer);
724 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
725 }
726 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
727 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
728 /* restart timer */
729 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
730 timer->hw.start(timer);
731 }
732 } else {
733 timer->hw.stop(timer);
734 }
735
736 /* now process all fast callbacks */
737 while (!list_empty(&timer->ack_list_head)) {
738 p = timer->ack_list_head.next; /* get first item */
739 ti = list_entry(p, struct snd_timer_instance, ack_list);
740
741 /* remove from ack_list and make empty */
742 list_del_init(p);
743
744 ticks = ti->pticks;
745 ti->pticks = 0;
746
747 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
748 spin_unlock(&timer->lock);
749 if (ti->callback)
750 ti->callback(ti, resolution, ticks);
751 spin_lock(&timer->lock);
752 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
753 }
754
755 /* do we have any slow callbacks? */
756 use_tasklet = !list_empty(&timer->sack_list_head);
757 spin_unlock_irqrestore(&timer->lock, flags);
758
759 if (use_tasklet)
760 tasklet_hi_schedule(&timer->task_queue);
761 }
762
763 /*
764
765 */
766
767 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
768 struct snd_timer **rtimer)
769 {
770 struct snd_timer *timer;
771 int err;
772 static struct snd_device_ops ops = {
773 .dev_free = snd_timer_dev_free,
774 .dev_register = snd_timer_dev_register,
775 .dev_unregister = snd_timer_dev_unregister
776 };
777
778 snd_assert(tid != NULL, return -EINVAL);
779 snd_assert(rtimer != NULL, return -EINVAL);
780 *rtimer = NULL;
781 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
782 if (timer == NULL) {
783 snd_printk(KERN_ERR "timer: cannot allocate\n");
784 return -ENOMEM;
785 }
786 timer->tmr_class = tid->dev_class;
787 timer->card = card;
788 timer->tmr_device = tid->device;
789 timer->tmr_subdevice = tid->subdevice;
790 if (id)
791 strlcpy(timer->id, id, sizeof(timer->id));
792 INIT_LIST_HEAD(&timer->device_list);
793 INIT_LIST_HEAD(&timer->open_list_head);
794 INIT_LIST_HEAD(&timer->active_list_head);
795 INIT_LIST_HEAD(&timer->ack_list_head);
796 INIT_LIST_HEAD(&timer->sack_list_head);
797 spin_lock_init(&timer->lock);
798 tasklet_init(&timer->task_queue, snd_timer_tasklet,
799 (unsigned long)timer);
800 if (card != NULL) {
801 timer->module = card->module;
802 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
803 if (err < 0) {
804 snd_timer_free(timer);
805 return err;
806 }
807 }
808 *rtimer = timer;
809 return 0;
810 }
811
812 static int snd_timer_free(struct snd_timer *timer)
813 {
814 snd_assert(timer != NULL, return -ENXIO);
815 if (timer->private_free)
816 timer->private_free(timer);
817 kfree(timer);
818 return 0;
819 }
820
821 static int snd_timer_dev_free(struct snd_device *device)
822 {
823 struct snd_timer *timer = device->device_data;
824 return snd_timer_free(timer);
825 }
826
827 static int snd_timer_dev_register(struct snd_device *dev)
828 {
829 struct snd_timer *timer = dev->device_data;
830 struct snd_timer *timer1;
831 struct list_head *p;
832
833 snd_assert(timer != NULL && timer->hw.start != NULL &&
834 timer->hw.stop != NULL, return -ENXIO);
835 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
836 !timer->hw.resolution && timer->hw.c_resolution == NULL)
837 return -EINVAL;
838
839 mutex_lock(&register_mutex);
840 list_for_each(p, &snd_timer_list) {
841 timer1 = list_entry(p, struct snd_timer, device_list);
842 if (timer1->tmr_class > timer->tmr_class)
843 break;
844 if (timer1->tmr_class < timer->tmr_class)
845 continue;
846 if (timer1->card && timer->card) {
847 if (timer1->card->number > timer->card->number)
848 break;
849 if (timer1->card->number < timer->card->number)
850 continue;
851 }
852 if (timer1->tmr_device > timer->tmr_device)
853 break;
854 if (timer1->tmr_device < timer->tmr_device)
855 continue;
856 if (timer1->tmr_subdevice > timer->tmr_subdevice)
857 break;
858 if (timer1->tmr_subdevice < timer->tmr_subdevice)
859 continue;
860 /* conflicts.. */
861 mutex_unlock(&register_mutex);
862 return -EBUSY;
863 }
864 list_add_tail(&timer->device_list, p);
865 mutex_unlock(&register_mutex);
866 return 0;
867 }
868
869 static int snd_timer_unregister(struct snd_timer *timer)
870 {
871 struct list_head *p, *n;
872 struct snd_timer_instance *ti;
873
874 snd_assert(timer != NULL, return -ENXIO);
875 mutex_lock(&register_mutex);
876 if (! list_empty(&timer->open_list_head)) {
877 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer);
878 list_for_each_safe(p, n, &timer->open_list_head) {
879 list_del_init(p);
880 ti = list_entry(p, struct snd_timer_instance, open_list);
881 ti->timer = NULL;
882 }
883 }
884 list_del(&timer->device_list);
885 mutex_unlock(&register_mutex);
886 return snd_timer_free(timer);
887 }
888
889 static int snd_timer_dev_unregister(struct snd_device *device)
890 {
891 struct snd_timer *timer = device->device_data;
892 return snd_timer_unregister(timer);
893 }
894
895 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
896 {
897 unsigned long flags;
898 unsigned long resolution = 0;
899 struct snd_timer_instance *ti, *ts;
900 struct list_head *p, *n;
901
902 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
903 return;
904 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART &&
905 event <= SNDRV_TIMER_EVENT_MRESUME, return);
906 spin_lock_irqsave(&timer->lock, flags);
907 if (event == SNDRV_TIMER_EVENT_MSTART ||
908 event == SNDRV_TIMER_EVENT_MCONTINUE ||
909 event == SNDRV_TIMER_EVENT_MRESUME) {
910 if (timer->hw.c_resolution)
911 resolution = timer->hw.c_resolution(timer);
912 else
913 resolution = timer->hw.resolution;
914 }
915 list_for_each(p, &timer->active_list_head) {
916 ti = list_entry(p, struct snd_timer_instance, active_list);
917 if (ti->ccallback)
918 ti->ccallback(ti, event, tstamp, resolution);
919 list_for_each(n, &ti->slave_active_head) {
920 ts = list_entry(n, struct snd_timer_instance, active_list);
921 if (ts->ccallback)
922 ts->ccallback(ts, event, tstamp, resolution);
923 }
924 }
925 spin_unlock_irqrestore(&timer->lock, flags);
926 }
927
928 /*
929 * exported functions for global timers
930 */
931 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
932 {
933 struct snd_timer_id tid;
934
935 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
936 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
937 tid.card = -1;
938 tid.device = device;
939 tid.subdevice = 0;
940 return snd_timer_new(NULL, id, &tid, rtimer);
941 }
942
943 int snd_timer_global_free(struct snd_timer *timer)
944 {
945 return snd_timer_free(timer);
946 }
947
948 int snd_timer_global_register(struct snd_timer *timer)
949 {
950 struct snd_device dev;
951
952 memset(&dev, 0, sizeof(dev));
953 dev.device_data = timer;
954 return snd_timer_dev_register(&dev);
955 }
956
957 int snd_timer_global_unregister(struct snd_timer *timer)
958 {
959 return snd_timer_unregister(timer);
960 }
961
962 /*
963 * System timer
964 */
965
966 struct snd_timer_system_private {
967 struct timer_list tlist;
968 struct timer * timer;
969 unsigned long last_expires;
970 unsigned long last_jiffies;
971 unsigned long correction;
972 };
973
974 static void snd_timer_s_function(unsigned long data)
975 {
976 struct snd_timer *timer = (struct snd_timer *)data;
977 struct snd_timer_system_private *priv = timer->private_data;
978 unsigned long jiff = jiffies;
979 if (time_after(jiff, priv->last_expires))
980 priv->correction = (long)jiff - (long)priv->last_expires;
981 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
982 }
983
984 static int snd_timer_s_start(struct snd_timer * timer)
985 {
986 struct snd_timer_system_private *priv;
987 unsigned long njiff;
988
989 priv = (struct snd_timer_system_private *) timer->private_data;
990 njiff = (priv->last_jiffies = jiffies);
991 if (priv->correction > timer->sticks - 1) {
992 priv->correction -= timer->sticks - 1;
993 njiff++;
994 } else {
995 njiff += timer->sticks - priv->correction;
996 priv->correction -= timer->sticks;
997 }
998 priv->last_expires = priv->tlist.expires = njiff;
999 add_timer(&priv->tlist);
1000 return 0;
1001 }
1002
1003 static int snd_timer_s_stop(struct snd_timer * timer)
1004 {
1005 struct snd_timer_system_private *priv;
1006 unsigned long jiff;
1007
1008 priv = (struct snd_timer_system_private *) timer->private_data;
1009 del_timer(&priv->tlist);
1010 jiff = jiffies;
1011 if (time_before(jiff, priv->last_expires))
1012 timer->sticks = priv->last_expires - jiff;
1013 else
1014 timer->sticks = 1;
1015 return 0;
1016 }
1017
1018 static struct snd_timer_hardware snd_timer_system =
1019 {
1020 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1021 .resolution = 1000000000L / HZ,
1022 .ticks = 10000000L,
1023 .start = snd_timer_s_start,
1024 .stop = snd_timer_s_stop
1025 };
1026
1027 static void snd_timer_free_system(struct snd_timer *timer)
1028 {
1029 kfree(timer->private_data);
1030 }
1031
1032 static int snd_timer_register_system(void)
1033 {
1034 struct snd_timer *timer;
1035 struct snd_timer_system_private *priv;
1036 int err;
1037
1038 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1039 if (err < 0)
1040 return err;
1041 strcpy(timer->name, "system timer");
1042 timer->hw = snd_timer_system;
1043 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1044 if (priv == NULL) {
1045 snd_timer_free(timer);
1046 return -ENOMEM;
1047 }
1048 init_timer(&priv->tlist);
1049 priv->tlist.function = snd_timer_s_function;
1050 priv->tlist.data = (unsigned long) timer;
1051 timer->private_data = priv;
1052 timer->private_free = snd_timer_free_system;
1053 return snd_timer_global_register(timer);
1054 }
1055
1056 #ifdef CONFIG_PROC_FS
1057 /*
1058 * Info interface
1059 */
1060
1061 static void snd_timer_proc_read(struct snd_info_entry *entry,
1062 struct snd_info_buffer *buffer)
1063 {
1064 unsigned long flags;
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 spin_lock_irqsave(&timer->lock, flags);
1099 list_for_each(q, &timer->open_list_head) {
1100 ti = list_entry(q, struct snd_timer_instance, open_list);
1101 snd_iprintf(buffer, " Client %s : %s\n",
1102 ti->owner ? ti->owner : "unknown",
1103 ti->flags & (SNDRV_TIMER_IFLG_START |
1104 SNDRV_TIMER_IFLG_RUNNING)
1105 ? "running" : "stopped");
1106 }
1107 spin_unlock_irqrestore(&timer->lock, flags);
1108 }
1109 mutex_unlock(&register_mutex);
1110 }
1111
1112 static struct snd_info_entry *snd_timer_proc_entry = NULL;
1113
1114 static void __init snd_timer_proc_init(void)
1115 {
1116 struct snd_info_entry *entry;
1117
1118 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1119 if (entry != NULL) {
1120 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128;
1121 entry->c.text.read = snd_timer_proc_read;
1122 if (snd_info_register(entry) < 0) {
1123 snd_info_free_entry(entry);
1124 entry = NULL;
1125 }
1126 }
1127 snd_timer_proc_entry = entry;
1128 }
1129
1130 static void __exit snd_timer_proc_done(void)
1131 {
1132 snd_info_unregister(snd_timer_proc_entry);
1133 }
1134 #else /* !CONFIG_PROC_FS */
1135 #define snd_timer_proc_init()
1136 #define snd_timer_proc_done()
1137 #endif
1138
1139 /*
1140 * USER SPACE interface
1141 */
1142
1143 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1144 unsigned long resolution,
1145 unsigned long ticks)
1146 {
1147 struct snd_timer_user *tu = timeri->callback_data;
1148 struct snd_timer_read *r;
1149 int prev;
1150
1151 spin_lock(&tu->qlock);
1152 if (tu->qused > 0) {
1153 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1154 r = &tu->queue[prev];
1155 if (r->resolution == resolution) {
1156 r->ticks += ticks;
1157 goto __wake;
1158 }
1159 }
1160 if (tu->qused >= tu->queue_size) {
1161 tu->overrun++;
1162 } else {
1163 r = &tu->queue[tu->qtail++];
1164 tu->qtail %= tu->queue_size;
1165 r->resolution = resolution;
1166 r->ticks = ticks;
1167 tu->qused++;
1168 }
1169 __wake:
1170 spin_unlock(&tu->qlock);
1171 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1172 wake_up(&tu->qchange_sleep);
1173 }
1174
1175 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1176 struct snd_timer_tread *tread)
1177 {
1178 if (tu->qused >= tu->queue_size) {
1179 tu->overrun++;
1180 } else {
1181 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1182 tu->qtail %= tu->queue_size;
1183 tu->qused++;
1184 }
1185 }
1186
1187 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1188 int event,
1189 struct timespec *tstamp,
1190 unsigned long resolution)
1191 {
1192 struct snd_timer_user *tu = timeri->callback_data;
1193 struct snd_timer_tread r1;
1194
1195 if (event >= SNDRV_TIMER_EVENT_START &&
1196 event <= SNDRV_TIMER_EVENT_PAUSE)
1197 tu->tstamp = *tstamp;
1198 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1199 return;
1200 r1.event = event;
1201 r1.tstamp = *tstamp;
1202 r1.val = resolution;
1203 spin_lock(&tu->qlock);
1204 snd_timer_user_append_to_tqueue(tu, &r1);
1205 spin_unlock(&tu->qlock);
1206 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1207 wake_up(&tu->qchange_sleep);
1208 }
1209
1210 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1211 unsigned long resolution,
1212 unsigned long ticks)
1213 {
1214 struct snd_timer_user *tu = timeri->callback_data;
1215 struct snd_timer_tread *r, r1;
1216 struct timespec tstamp;
1217 int prev, append = 0;
1218
1219 memset(&tstamp, 0, sizeof(tstamp));
1220 spin_lock(&tu->qlock);
1221 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1222 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1223 spin_unlock(&tu->qlock);
1224 return;
1225 }
1226 if (tu->last_resolution != resolution || ticks > 0)
1227 getnstimeofday(&tstamp);
1228 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1229 tu->last_resolution != resolution) {
1230 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1231 r1.tstamp = tstamp;
1232 r1.val = resolution;
1233 snd_timer_user_append_to_tqueue(tu, &r1);
1234 tu->last_resolution = resolution;
1235 append++;
1236 }
1237 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1238 goto __wake;
1239 if (ticks == 0)
1240 goto __wake;
1241 if (tu->qused > 0) {
1242 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1243 r = &tu->tqueue[prev];
1244 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1245 r->tstamp = tstamp;
1246 r->val += ticks;
1247 append++;
1248 goto __wake;
1249 }
1250 }
1251 r1.event = SNDRV_TIMER_EVENT_TICK;
1252 r1.tstamp = tstamp;
1253 r1.val = ticks;
1254 snd_timer_user_append_to_tqueue(tu, &r1);
1255 append++;
1256 __wake:
1257 spin_unlock(&tu->qlock);
1258 if (append == 0)
1259 return;
1260 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1261 wake_up(&tu->qchange_sleep);
1262 }
1263
1264 static int snd_timer_user_open(struct inode *inode, struct file *file)
1265 {
1266 struct snd_timer_user *tu;
1267
1268 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1269 if (tu == NULL)
1270 return -ENOMEM;
1271 spin_lock_init(&tu->qlock);
1272 init_waitqueue_head(&tu->qchange_sleep);
1273 mutex_init(&tu->tread_sem);
1274 tu->ticks = 1;
1275 tu->queue_size = 128;
1276 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1277 GFP_KERNEL);
1278 if (tu->queue == NULL) {
1279 kfree(tu);
1280 return -ENOMEM;
1281 }
1282 file->private_data = tu;
1283 return 0;
1284 }
1285
1286 static int snd_timer_user_release(struct inode *inode, struct file *file)
1287 {
1288 struct snd_timer_user *tu;
1289
1290 if (file->private_data) {
1291 tu = file->private_data;
1292 file->private_data = NULL;
1293 fasync_helper(-1, file, 0, &tu->fasync);
1294 if (tu->timeri)
1295 snd_timer_close(tu->timeri);
1296 kfree(tu->queue);
1297 kfree(tu->tqueue);
1298 kfree(tu);
1299 }
1300 return 0;
1301 }
1302
1303 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1304 {
1305 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1306 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1307 id->card = -1;
1308 id->device = -1;
1309 id->subdevice = -1;
1310 }
1311
1312 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1313 {
1314 id->dev_class = timer->tmr_class;
1315 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1316 id->card = timer->card ? timer->card->number : -1;
1317 id->device = timer->tmr_device;
1318 id->subdevice = timer->tmr_subdevice;
1319 }
1320
1321 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1322 {
1323 struct snd_timer_id id;
1324 struct snd_timer *timer;
1325 struct list_head *p;
1326
1327 if (copy_from_user(&id, _tid, sizeof(id)))
1328 return -EFAULT;
1329 mutex_lock(&register_mutex);
1330 if (id.dev_class < 0) { /* first item */
1331 if (list_empty(&snd_timer_list))
1332 snd_timer_user_zero_id(&id);
1333 else {
1334 timer = list_entry(snd_timer_list.next,
1335 struct snd_timer, device_list);
1336 snd_timer_user_copy_id(&id, timer);
1337 }
1338 } else {
1339 switch (id.dev_class) {
1340 case SNDRV_TIMER_CLASS_GLOBAL:
1341 id.device = id.device < 0 ? 0 : id.device + 1;
1342 list_for_each(p, &snd_timer_list) {
1343 timer = list_entry(p, struct snd_timer, device_list);
1344 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1345 snd_timer_user_copy_id(&id, timer);
1346 break;
1347 }
1348 if (timer->tmr_device >= id.device) {
1349 snd_timer_user_copy_id(&id, timer);
1350 break;
1351 }
1352 }
1353 if (p == &snd_timer_list)
1354 snd_timer_user_zero_id(&id);
1355 break;
1356 case SNDRV_TIMER_CLASS_CARD:
1357 case SNDRV_TIMER_CLASS_PCM:
1358 if (id.card < 0) {
1359 id.card = 0;
1360 } else {
1361 if (id.card < 0) {
1362 id.card = 0;
1363 } else {
1364 if (id.device < 0) {
1365 id.device = 0;
1366 } else {
1367 if (id.subdevice < 0) {
1368 id.subdevice = 0;
1369 } else {
1370 id.subdevice++;
1371 }
1372 }
1373 }
1374 }
1375 list_for_each(p, &snd_timer_list) {
1376 timer = list_entry(p, struct snd_timer, device_list);
1377 if (timer->tmr_class > id.dev_class) {
1378 snd_timer_user_copy_id(&id, timer);
1379 break;
1380 }
1381 if (timer->tmr_class < id.dev_class)
1382 continue;
1383 if (timer->card->number > id.card) {
1384 snd_timer_user_copy_id(&id, timer);
1385 break;
1386 }
1387 if (timer->card->number < id.card)
1388 continue;
1389 if (timer->tmr_device > id.device) {
1390 snd_timer_user_copy_id(&id, timer);
1391 break;
1392 }
1393 if (timer->tmr_device < id.device)
1394 continue;
1395 if (timer->tmr_subdevice > id.subdevice) {
1396 snd_timer_user_copy_id(&id, timer);
1397 break;
1398 }
1399 if (timer->tmr_subdevice < id.subdevice)
1400 continue;
1401 snd_timer_user_copy_id(&id, timer);
1402 break;
1403 }
1404 if (p == &snd_timer_list)
1405 snd_timer_user_zero_id(&id);
1406 break;
1407 default:
1408 snd_timer_user_zero_id(&id);
1409 }
1410 }
1411 mutex_unlock(&register_mutex);
1412 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1413 return -EFAULT;
1414 return 0;
1415 }
1416
1417 static int snd_timer_user_ginfo(struct file *file,
1418 struct snd_timer_ginfo __user *_ginfo)
1419 {
1420 struct snd_timer_ginfo *ginfo;
1421 struct snd_timer_id tid;
1422 struct snd_timer *t;
1423 struct list_head *p;
1424 int err = 0;
1425
1426 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1427 if (! ginfo)
1428 return -ENOMEM;
1429 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1430 kfree(ginfo);
1431 return -EFAULT;
1432 }
1433 tid = ginfo->tid;
1434 memset(ginfo, 0, sizeof(*ginfo));
1435 ginfo->tid = tid;
1436 mutex_lock(&register_mutex);
1437 t = snd_timer_find(&tid);
1438 if (t != NULL) {
1439 ginfo->card = t->card ? t->card->number : -1;
1440 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1441 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1442 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1443 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1444 ginfo->resolution = t->hw.resolution;
1445 if (t->hw.resolution_min > 0) {
1446 ginfo->resolution_min = t->hw.resolution_min;
1447 ginfo->resolution_max = t->hw.resolution_max;
1448 }
1449 list_for_each(p, &t->open_list_head) {
1450 ginfo->clients++;
1451 }
1452 } else {
1453 err = -ENODEV;
1454 }
1455 mutex_unlock(&register_mutex);
1456 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1457 err = -EFAULT;
1458 kfree(ginfo);
1459 return err;
1460 }
1461
1462 static int snd_timer_user_gparams(struct file *file,
1463 struct snd_timer_gparams __user *_gparams)
1464 {
1465 struct snd_timer_gparams gparams;
1466 struct snd_timer *t;
1467 int err;
1468
1469 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1470 return -EFAULT;
1471 mutex_lock(&register_mutex);
1472 t = snd_timer_find(&gparams.tid);
1473 if (!t) {
1474 err = -ENODEV;
1475 goto _error;
1476 }
1477 if (!list_empty(&t->open_list_head)) {
1478 err = -EBUSY;
1479 goto _error;
1480 }
1481 if (!t->hw.set_period) {
1482 err = -ENOSYS;
1483 goto _error;
1484 }
1485 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1486 _error:
1487 mutex_unlock(&register_mutex);
1488 return err;
1489 }
1490
1491 static int snd_timer_user_gstatus(struct file *file,
1492 struct snd_timer_gstatus __user *_gstatus)
1493 {
1494 struct snd_timer_gstatus gstatus;
1495 struct snd_timer_id tid;
1496 struct snd_timer *t;
1497 int err = 0;
1498
1499 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1500 return -EFAULT;
1501 tid = gstatus.tid;
1502 memset(&gstatus, 0, sizeof(gstatus));
1503 gstatus.tid = tid;
1504 mutex_lock(&register_mutex);
1505 t = snd_timer_find(&tid);
1506 if (t != NULL) {
1507 if (t->hw.c_resolution)
1508 gstatus.resolution = t->hw.c_resolution(t);
1509 else
1510 gstatus.resolution = t->hw.resolution;
1511 if (t->hw.precise_resolution) {
1512 t->hw.precise_resolution(t, &gstatus.resolution_num,
1513 &gstatus.resolution_den);
1514 } else {
1515 gstatus.resolution_num = gstatus.resolution;
1516 gstatus.resolution_den = 1000000000uL;
1517 }
1518 } else {
1519 err = -ENODEV;
1520 }
1521 mutex_unlock(&register_mutex);
1522 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1523 err = -EFAULT;
1524 return err;
1525 }
1526
1527 static int snd_timer_user_tselect(struct file *file,
1528 struct snd_timer_select __user *_tselect)
1529 {
1530 struct snd_timer_user *tu;
1531 struct snd_timer_select tselect;
1532 char str[32];
1533 int err = 0;
1534
1535 tu = file->private_data;
1536 mutex_lock(&tu->tread_sem);
1537 if (tu->timeri) {
1538 snd_timer_close(tu->timeri);
1539 tu->timeri = NULL;
1540 }
1541 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1542 err = -EFAULT;
1543 goto __err;
1544 }
1545 sprintf(str, "application %i", current->pid);
1546 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1547 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1548 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1549 if (err < 0)
1550 goto __err;
1551
1552 kfree(tu->queue);
1553 tu->queue = NULL;
1554 kfree(tu->tqueue);
1555 tu->tqueue = NULL;
1556 if (tu->tread) {
1557 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1558 GFP_KERNEL);
1559 if (tu->tqueue == NULL)
1560 err = -ENOMEM;
1561 } else {
1562 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1563 GFP_KERNEL);
1564 if (tu->queue == NULL)
1565 err = -ENOMEM;
1566 }
1567
1568 if (err < 0) {
1569 snd_timer_close(tu->timeri);
1570 tu->timeri = NULL;
1571 } else {
1572 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1573 tu->timeri->callback = tu->tread
1574 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1575 tu->timeri->ccallback = snd_timer_user_ccallback;
1576 tu->timeri->callback_data = (void *)tu;
1577 }
1578
1579 __err:
1580 mutex_unlock(&tu->tread_sem);
1581 return err;
1582 }
1583
1584 static int snd_timer_user_info(struct file *file,
1585 struct snd_timer_info __user *_info)
1586 {
1587 struct snd_timer_user *tu;
1588 struct snd_timer_info *info;
1589 struct snd_timer *t;
1590 int err = 0;
1591
1592 tu = file->private_data;
1593 snd_assert(tu->timeri != NULL, return -ENXIO);
1594 t = tu->timeri->timer;
1595 snd_assert(t != NULL, return -ENXIO);
1596
1597 info = kzalloc(sizeof(*info), GFP_KERNEL);
1598 if (! info)
1599 return -ENOMEM;
1600 info->card = t->card ? t->card->number : -1;
1601 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1602 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1603 strlcpy(info->id, t->id, sizeof(info->id));
1604 strlcpy(info->name, t->name, sizeof(info->name));
1605 info->resolution = t->hw.resolution;
1606 if (copy_to_user(_info, info, sizeof(*_info)))
1607 err = -EFAULT;
1608 kfree(info);
1609 return err;
1610 }
1611
1612 static int snd_timer_user_params(struct file *file,
1613 struct snd_timer_params __user *_params)
1614 {
1615 struct snd_timer_user *tu;
1616 struct snd_timer_params params;
1617 struct snd_timer *t;
1618 struct snd_timer_read *tr;
1619 struct snd_timer_tread *ttr;
1620 int err;
1621
1622 tu = file->private_data;
1623 snd_assert(tu->timeri != NULL, return -ENXIO);
1624 t = tu->timeri->timer;
1625 snd_assert(t != NULL, return -ENXIO);
1626 if (copy_from_user(&params, _params, sizeof(params)))
1627 return -EFAULT;
1628 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1629 err = -EINVAL;
1630 goto _end;
1631 }
1632 if (params.queue_size > 0 &&
1633 (params.queue_size < 32 || params.queue_size > 1024)) {
1634 err = -EINVAL;
1635 goto _end;
1636 }
1637 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1638 (1<<SNDRV_TIMER_EVENT_TICK)|
1639 (1<<SNDRV_TIMER_EVENT_START)|
1640 (1<<SNDRV_TIMER_EVENT_STOP)|
1641 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1642 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1643 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1644 (1<<SNDRV_TIMER_EVENT_RESUME)|
1645 (1<<SNDRV_TIMER_EVENT_MSTART)|
1646 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1647 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1648 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1649 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1650 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1651 err = -EINVAL;
1652 goto _end;
1653 }
1654 snd_timer_stop(tu->timeri);
1655 spin_lock_irq(&t->lock);
1656 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1657 SNDRV_TIMER_IFLG_EXCLUSIVE|
1658 SNDRV_TIMER_IFLG_EARLY_EVENT);
1659 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1660 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1661 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1662 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1663 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1664 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1665 spin_unlock_irq(&t->lock);
1666 if (params.queue_size > 0 &&
1667 (unsigned int)tu->queue_size != params.queue_size) {
1668 if (tu->tread) {
1669 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1670 GFP_KERNEL);
1671 if (ttr) {
1672 kfree(tu->tqueue);
1673 tu->queue_size = params.queue_size;
1674 tu->tqueue = ttr;
1675 }
1676 } else {
1677 tr = kmalloc(params.queue_size * sizeof(*tr),
1678 GFP_KERNEL);
1679 if (tr) {
1680 kfree(tu->queue);
1681 tu->queue_size = params.queue_size;
1682 tu->queue = tr;
1683 }
1684 }
1685 }
1686 tu->qhead = tu->qtail = tu->qused = 0;
1687 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1688 if (tu->tread) {
1689 struct snd_timer_tread tread;
1690 tread.event = SNDRV_TIMER_EVENT_EARLY;
1691 tread.tstamp.tv_sec = 0;
1692 tread.tstamp.tv_nsec = 0;
1693 tread.val = 0;
1694 snd_timer_user_append_to_tqueue(tu, &tread);
1695 } else {
1696 struct snd_timer_read *r = &tu->queue[0];
1697 r->resolution = 0;
1698 r->ticks = 0;
1699 tu->qused++;
1700 tu->qtail++;
1701 }
1702 }
1703 tu->filter = params.filter;
1704 tu->ticks = params.ticks;
1705 err = 0;
1706 _end:
1707 if (copy_to_user(_params, &params, sizeof(params)))
1708 return -EFAULT;
1709 return err;
1710 }
1711
1712 static int snd_timer_user_status(struct file *file,
1713 struct snd_timer_status __user *_status)
1714 {
1715 struct snd_timer_user *tu;
1716 struct snd_timer_status status;
1717
1718 tu = file->private_data;
1719 snd_assert(tu->timeri != NULL, return -ENXIO);
1720 memset(&status, 0, sizeof(status));
1721 status.tstamp = tu->tstamp;
1722 status.resolution = snd_timer_resolution(tu->timeri);
1723 status.lost = tu->timeri->lost;
1724 status.overrun = tu->overrun;
1725 spin_lock_irq(&tu->qlock);
1726 status.queue = tu->qused;
1727 spin_unlock_irq(&tu->qlock);
1728 if (copy_to_user(_status, &status, sizeof(status)))
1729 return -EFAULT;
1730 return 0;
1731 }
1732
1733 static int snd_timer_user_start(struct file *file)
1734 {
1735 int err;
1736 struct snd_timer_user *tu;
1737
1738 tu = file->private_data;
1739 snd_assert(tu->timeri != NULL, return -ENXIO);
1740 snd_timer_stop(tu->timeri);
1741 tu->timeri->lost = 0;
1742 tu->last_resolution = 0;
1743 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1744 }
1745
1746 static int snd_timer_user_stop(struct file *file)
1747 {
1748 int err;
1749 struct snd_timer_user *tu;
1750
1751 tu = file->private_data;
1752 snd_assert(tu->timeri != NULL, return -ENXIO);
1753 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1754 }
1755
1756 static int snd_timer_user_continue(struct file *file)
1757 {
1758 int err;
1759 struct snd_timer_user *tu;
1760
1761 tu = file->private_data;
1762 snd_assert(tu->timeri != NULL, return -ENXIO);
1763 tu->timeri->lost = 0;
1764 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1765 }
1766
1767 static int snd_timer_user_pause(struct file *file)
1768 {
1769 int err;
1770 struct snd_timer_user *tu;
1771
1772 tu = file->private_data;
1773 snd_assert(tu->timeri != NULL, return -ENXIO);
1774 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1775 }
1776
1777 enum {
1778 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1779 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1780 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1781 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1782 };
1783
1784 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1785 unsigned long arg)
1786 {
1787 struct snd_timer_user *tu;
1788 void __user *argp = (void __user *)arg;
1789 int __user *p = argp;
1790
1791 tu = file->private_data;
1792 switch (cmd) {
1793 case SNDRV_TIMER_IOCTL_PVERSION:
1794 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1795 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1796 return snd_timer_user_next_device(argp);
1797 case SNDRV_TIMER_IOCTL_TREAD:
1798 {
1799 int xarg;
1800
1801 mutex_lock(&tu->tread_sem);
1802 if (tu->timeri) { /* too late */
1803 mutex_unlock(&tu->tread_sem);
1804 return -EBUSY;
1805 }
1806 if (get_user(xarg, p)) {
1807 mutex_unlock(&tu->tread_sem);
1808 return -EFAULT;
1809 }
1810 tu->tread = xarg ? 1 : 0;
1811 mutex_unlock(&tu->tread_sem);
1812 return 0;
1813 }
1814 case SNDRV_TIMER_IOCTL_GINFO:
1815 return snd_timer_user_ginfo(file, argp);
1816 case SNDRV_TIMER_IOCTL_GPARAMS:
1817 return snd_timer_user_gparams(file, argp);
1818 case SNDRV_TIMER_IOCTL_GSTATUS:
1819 return snd_timer_user_gstatus(file, argp);
1820 case SNDRV_TIMER_IOCTL_SELECT:
1821 return snd_timer_user_tselect(file, argp);
1822 case SNDRV_TIMER_IOCTL_INFO:
1823 return snd_timer_user_info(file, argp);
1824 case SNDRV_TIMER_IOCTL_PARAMS:
1825 return snd_timer_user_params(file, argp);
1826 case SNDRV_TIMER_IOCTL_STATUS:
1827 return snd_timer_user_status(file, argp);
1828 case SNDRV_TIMER_IOCTL_START:
1829 case SNDRV_TIMER_IOCTL_START_OLD:
1830 return snd_timer_user_start(file);
1831 case SNDRV_TIMER_IOCTL_STOP:
1832 case SNDRV_TIMER_IOCTL_STOP_OLD:
1833 return snd_timer_user_stop(file);
1834 case SNDRV_TIMER_IOCTL_CONTINUE:
1835 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1836 return snd_timer_user_continue(file);
1837 case SNDRV_TIMER_IOCTL_PAUSE:
1838 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1839 return snd_timer_user_pause(file);
1840 }
1841 return -ENOTTY;
1842 }
1843
1844 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1845 {
1846 struct snd_timer_user *tu;
1847 int err;
1848
1849 tu = file->private_data;
1850 err = fasync_helper(fd, file, on, &tu->fasync);
1851 if (err < 0)
1852 return err;
1853 return 0;
1854 }
1855
1856 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1857 size_t count, loff_t *offset)
1858 {
1859 struct snd_timer_user *tu;
1860 long result = 0, unit;
1861 int err = 0;
1862
1863 tu = file->private_data;
1864 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1865 spin_lock_irq(&tu->qlock);
1866 while ((long)count - result >= unit) {
1867 while (!tu->qused) {
1868 wait_queue_t wait;
1869
1870 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1871 err = -EAGAIN;
1872 break;
1873 }
1874
1875 set_current_state(TASK_INTERRUPTIBLE);
1876 init_waitqueue_entry(&wait, current);
1877 add_wait_queue(&tu->qchange_sleep, &wait);
1878
1879 spin_unlock_irq(&tu->qlock);
1880 schedule();
1881 spin_lock_irq(&tu->qlock);
1882
1883 remove_wait_queue(&tu->qchange_sleep, &wait);
1884
1885 if (signal_pending(current)) {
1886 err = -ERESTARTSYS;
1887 break;
1888 }
1889 }
1890
1891 spin_unlock_irq(&tu->qlock);
1892 if (err < 0)
1893 goto _error;
1894
1895 if (tu->tread) {
1896 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1897 sizeof(struct snd_timer_tread))) {
1898 err = -EFAULT;
1899 goto _error;
1900 }
1901 } else {
1902 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1903 sizeof(struct snd_timer_read))) {
1904 err = -EFAULT;
1905 goto _error;
1906 }
1907 }
1908
1909 tu->qhead %= tu->queue_size;
1910
1911 result += unit;
1912 buffer += unit;
1913
1914 spin_lock_irq(&tu->qlock);
1915 tu->qused--;
1916 }
1917 spin_unlock_irq(&tu->qlock);
1918 _error:
1919 return result > 0 ? result : err;
1920 }
1921
1922 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1923 {
1924 unsigned int mask;
1925 struct snd_timer_user *tu;
1926
1927 tu = file->private_data;
1928
1929 poll_wait(file, &tu->qchange_sleep, wait);
1930
1931 mask = 0;
1932 if (tu->qused)
1933 mask |= POLLIN | POLLRDNORM;
1934
1935 return mask;
1936 }
1937
1938 #ifdef CONFIG_COMPAT
1939 #include "timer_compat.c"
1940 #else
1941 #define snd_timer_user_ioctl_compat NULL
1942 #endif
1943
1944 static struct file_operations snd_timer_f_ops =
1945 {
1946 .owner = THIS_MODULE,
1947 .read = snd_timer_user_read,
1948 .open = snd_timer_user_open,
1949 .release = snd_timer_user_release,
1950 .poll = snd_timer_user_poll,
1951 .unlocked_ioctl = snd_timer_user_ioctl,
1952 .compat_ioctl = snd_timer_user_ioctl_compat,
1953 .fasync = snd_timer_user_fasync,
1954 };
1955
1956 /*
1957 * ENTRY functions
1958 */
1959
1960 static int __init alsa_timer_init(void)
1961 {
1962 int err;
1963
1964 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1965 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1966 "system timer");
1967 #endif
1968
1969 if ((err = snd_timer_register_system()) < 0)
1970 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1971 err);
1972 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1973 &snd_timer_f_ops, NULL, "timer")) < 0)
1974 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1975 err);
1976 snd_timer_proc_init();
1977 return 0;
1978 }
1979
1980 static void __exit alsa_timer_exit(void)
1981 {
1982 struct list_head *p, *n;
1983
1984 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1985 /* unregister the system timer */
1986 list_for_each_safe(p, n, &snd_timer_list) {
1987 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1988 snd_timer_unregister(timer);
1989 }
1990 snd_timer_proc_done();
1991 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1992 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1993 #endif
1994 }
1995
1996 module_init(alsa_timer_init)
1997 module_exit(alsa_timer_exit)
1998
1999 EXPORT_SYMBOL(snd_timer_open);
2000 EXPORT_SYMBOL(snd_timer_close);
2001 EXPORT_SYMBOL(snd_timer_resolution);
2002 EXPORT_SYMBOL(snd_timer_start);
2003 EXPORT_SYMBOL(snd_timer_stop);
2004 EXPORT_SYMBOL(snd_timer_continue);
2005 EXPORT_SYMBOL(snd_timer_pause);
2006 EXPORT_SYMBOL(snd_timer_new);
2007 EXPORT_SYMBOL(snd_timer_notify);
2008 EXPORT_SYMBOL(snd_timer_global_new);
2009 EXPORT_SYMBOL(snd_timer_global_free);
2010 EXPORT_SYMBOL(snd_timer_global_register);
2011 EXPORT_SYMBOL(snd_timer_global_unregister);
2012 EXPORT_SYMBOL(snd_timer_interrupt);
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