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[ALSA] ALSA's struct _snd_pcm_substream: Obsolete open_flag
[deliverable/linux.git] / sound / core / timer.c
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1da177e4
LT		 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/moduleparam.h>
543537bd 29#include <linux/string.h>
1da177e4
LT		 30#include <sound/core.h>
31#include <sound/timer.h>
32#include <sound/control.h>
33#include <sound/info.h>
34#include <sound/minors.h>
35#include <sound/initval.h>
36#include <linux/kmod.h>
37#ifdef CONFIG_KERNELD
38#include <linux/kerneld.h>
39#endif
40
41#if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
42#define DEFAULT_TIMER_LIMIT 3
43#elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
44#define DEFAULT_TIMER_LIMIT 2
45#else
46#define DEFAULT_TIMER_LIMIT 1
47#endif
48
49static int timer_limit = DEFAULT_TIMER_LIMIT;
50MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>");
51MODULE_DESCRIPTION("ALSA timer interface");
52MODULE_LICENSE("GPL");
53module_param(timer_limit, int, 0444);
54MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
55
56typedef struct {
57 snd_timer_instance_t *timeri;
58 int tread; /* enhanced read with timestamps and events */
59 unsigned long ticks;
60 unsigned long overrun;
61 int qhead;
62 int qtail;
63 int qused;
64 int queue_size;
65 snd_timer_read_t *queue;
66 snd_timer_tread_t *tqueue;
67 spinlock_t qlock;
68 unsigned long last_resolution;
69 unsigned int filter;
70 struct timespec tstamp; /* trigger tstamp */
71 wait_queue_head_t qchange_sleep;
72 struct fasync_struct *fasync;
c1935b4d 73 struct semaphore tread_sem;
1da177e4
LT		 74} snd_timer_user_t;
75
76/* list of timers */
77static LIST_HEAD(snd_timer_list);
78
79/* list of slave instances */
80static LIST_HEAD(snd_timer_slave_list);
81
82/* lock for slave active lists */
83static DEFINE_SPINLOCK(slave_active_lock);
84
85static DECLARE_MUTEX(register_mutex);
86
87static int snd_timer_free(snd_timer_t *timer);
88static int snd_timer_dev_free(snd_device_t *device);
89static int snd_timer_dev_register(snd_device_t *device);
90static int snd_timer_dev_unregister(snd_device_t *device);
91
92static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left);
93
94/*
95 * create a timer instance with the given owner string.
96 * when timer is not NULL, increments the module counter
97 */
98static snd_timer_instance_t *snd_timer_instance_new(char *owner, snd_timer_t *timer)
99{
100 snd_timer_instance_t *timeri;
101 timeri = kcalloc(1, sizeof(*timeri), GFP_KERNEL);
102 if (timeri == NULL)
103 return NULL;
543537bd 104 timeri->owner = kstrdup(owner, GFP_KERNEL);
1da177e4
LT		 105 if (! timeri->owner) {
106 kfree(timeri);
107 return NULL;
108 }
109 INIT_LIST_HEAD(&timeri->open_list);
110 INIT_LIST_HEAD(&timeri->active_list);
111 INIT_LIST_HEAD(&timeri->ack_list);
112 INIT_LIST_HEAD(&timeri->slave_list_head);
113 INIT_LIST_HEAD(&timeri->slave_active_head);
114
115 timeri->timer = timer;
116 if (timer && timer->card && !try_module_get(timer->card->module)) {
117 kfree(timeri->owner);
118 kfree(timeri);
119 return NULL;
120 }
121
122 return timeri;
123}
124
125/*
126 * find a timer instance from the given timer id
127 */
128static snd_timer_t *snd_timer_find(snd_timer_id_t *tid)
129{
130 snd_timer_t *timer = NULL;
131 struct list_head *p;
132
133 list_for_each(p, &snd_timer_list) {
134 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
135
136 if (timer->tmr_class != tid->dev_class)
137 continue;
138 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
139 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
140 (timer->card == NULL ||
141 timer->card->number != tid->card))
142 continue;
143 if (timer->tmr_device != tid->device)
144 continue;
145 if (timer->tmr_subdevice != tid->subdevice)
146 continue;
147 return timer;
148 }
149 return NULL;
150}
151
152#ifdef CONFIG_KMOD
153
154static void snd_timer_request(snd_timer_id_t *tid)
155{
156 if (! current->fs->root)
157 return;
158 switch (tid->dev_class) {
159 case SNDRV_TIMER_CLASS_GLOBAL:
160 if (tid->device < timer_limit)
161 request_module("snd-timer-%i", tid->device);
162 break;
163 case SNDRV_TIMER_CLASS_CARD:
164 case SNDRV_TIMER_CLASS_PCM:
165 if (tid->card < snd_ecards_limit)
166 request_module("snd-card-%i", tid->card);
167 break;
168 default:
169 break;
170 }
171}
172
173#endif
174
175/*
176 * look for a master instance matching with the slave id of the given slave.
177 * when found, relink the open_link of the slave.
178 *
179 * call this with register_mutex down.
180 */
181static void snd_timer_check_slave(snd_timer_instance_t *slave)
182{
183 snd_timer_t *timer;
184 snd_timer_instance_t *master;
185 struct list_head *p, *q;
186
187 /* FIXME: it's really dumb to look up all entries.. */
188 list_for_each(p, &snd_timer_list) {
189 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
190 list_for_each(q, &timer->open_list_head) {
191 master = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list);
192 if (slave->slave_class == master->slave_class &&
193 slave->slave_id == master->slave_id) {
194 list_del(&slave->open_list);
195 list_add_tail(&slave->open_list, &master->slave_list_head);
196 spin_lock_irq(&slave_active_lock);
197 slave->master = master;
198 slave->timer = master->timer;
199 spin_unlock_irq(&slave_active_lock);
200 return;
201 }
202 }
203 }
204}
205
206/*
207 * look for slave instances matching with the slave id of the given master.
208 * when found, relink the open_link of slaves.
209 *
210 * call this with register_mutex down.
211 */
212static void snd_timer_check_master(snd_timer_instance_t *master)
213{
214 snd_timer_instance_t *slave;
215 struct list_head *p, *n;
216
217 /* check all pending slaves */
218 list_for_each_safe(p, n, &snd_timer_slave_list) {
219 slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
220 if (slave->slave_class == master->slave_class &&
221 slave->slave_id == master->slave_id) {
222 list_del(p);
223 list_add_tail(p, &master->slave_list_head);
224 spin_lock_irq(&slave_active_lock);
225 slave->master = master;
226 slave->timer = master->timer;
227 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
228 list_add_tail(&slave->active_list, &master->slave_active_head);
229 spin_unlock_irq(&slave_active_lock);
230 }
231 }
232}
233
234/*
235 * open a timer instance
236 * when opening a master, the slave id must be here given.
237 */
238int snd_timer_open(snd_timer_instance_t **ti,
239 char *owner, snd_timer_id_t *tid,
240 unsigned int slave_id)
241{
242 snd_timer_t *timer;
243 snd_timer_instance_t *timeri = NULL;
244
245 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
246 /* open a slave instance */
247 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
248 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
249 snd_printd("invalid slave class %i\n", tid->dev_sclass);
250 return -EINVAL;
251 }
252 down(&register_mutex);
253 timeri = snd_timer_instance_new(owner, NULL);
254 timeri->slave_class = tid->dev_sclass;
255 timeri->slave_id = tid->device;
256 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
257 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
258 snd_timer_check_slave(timeri);
259 up(&register_mutex);
260 *ti = timeri;
261 return 0;
262 }
263
264 /* open a master instance */
265 down(&register_mutex);
266 timer = snd_timer_find(tid);
267#ifdef CONFIG_KMOD
268 if (timer == NULL) {
269 up(&register_mutex);
270 snd_timer_request(tid);
271 down(&register_mutex);
272 timer = snd_timer_find(tid);
273 }
274#endif
275 if (timer) {
276 if (!list_empty(&timer->open_list_head)) {
277 timeri = (snd_timer_instance_t *)list_entry(timer->open_list_head.next, snd_timer_instance_t, open_list);
278 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
279 up(&register_mutex);
280 return -EBUSY;
281 }
282 }
283 timeri = snd_timer_instance_new(owner, timer);
284 if (timeri) {
285 timeri->slave_class = tid->dev_sclass;
286 timeri->slave_id = slave_id;
287 if (list_empty(&timer->open_list_head) && timer->hw.open)
288 timer->hw.open(timer);
289 list_add_tail(&timeri->open_list, &timer->open_list_head);
290 snd_timer_check_master(timeri);
291 }
292 } else {
293 up(&register_mutex);
294 return -ENODEV;
295 }
296 up(&register_mutex);
297 *ti = timeri;
298 return 0;
299}
300
301static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event);
302
303/*
304 * close a timer instance
305 */
306int snd_timer_close(snd_timer_instance_t * timeri)
307{
308 snd_timer_t *timer = NULL;
309 struct list_head *p, *n;
310 snd_timer_instance_t *slave;
311
312 snd_assert(timeri != NULL, return -ENXIO);
313
314 /* force to stop the timer */
315 snd_timer_stop(timeri);
316
317 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
318 /* wait, until the active callback is finished */
319 spin_lock_irq(&slave_active_lock);
320 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
321 spin_unlock_irq(&slave_active_lock);
322 udelay(10);
323 spin_lock_irq(&slave_active_lock);
324 }
325 spin_unlock_irq(&slave_active_lock);
326 down(&register_mutex);
327 list_del(&timeri->open_list);
328 up(&register_mutex);
329 } else {
330 timer = timeri->timer;
331 /* wait, until the active callback is finished */
332 spin_lock_irq(&timer->lock);
333 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
334 spin_unlock_irq(&timer->lock);
335 udelay(10);
336 spin_lock_irq(&timer->lock);
337 }
338 spin_unlock_irq(&timer->lock);
339 down(&register_mutex);
340 list_del(&timeri->open_list);
341 if (timer && list_empty(&timer->open_list_head) && timer->hw.close)
342 timer->hw.close(timer);
343 /* remove slave links */
344 list_for_each_safe(p, n, &timeri->slave_list_head) {
345 slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
346 spin_lock_irq(&slave_active_lock);
347 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
348 list_del(p);
349 list_add_tail(p, &snd_timer_slave_list);
350 slave->master = NULL;
351 slave->timer = NULL;
352 spin_unlock_irq(&slave_active_lock);
353 }
354 up(&register_mutex);
355 }
356 if (timeri->private_free)
357 timeri->private_free(timeri);
358 kfree(timeri->owner);
359 kfree(timeri);
360 if (timer && timer->card)
361 module_put(timer->card->module);
362 return 0;
363}
364
365unsigned long snd_timer_resolution(snd_timer_instance_t * timeri)
366{
367 snd_timer_t * timer;
368
369 if (timeri == NULL)
370 return 0;
371 if ((timer = timeri->timer) != NULL) {
372 if (timer->hw.c_resolution)
373 return timer->hw.c_resolution(timer);
374 return timer->hw.resolution;
375 }
376 return 0;
377}
378
379static void snd_timer_notify1(snd_timer_instance_t *ti, enum sndrv_timer_event event)
380{
381 snd_timer_t *timer;
382 unsigned long flags;
383 unsigned long resolution = 0;
384 snd_timer_instance_t *ts;
385 struct list_head *n;
386 struct timespec tstamp;
387
388 snd_timestamp_now(&tstamp, 1);
389 snd_assert(event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE, return);
390 if (event == SNDRV_TIMER_EVENT_START || event == SNDRV_TIMER_EVENT_CONTINUE)
391 resolution = snd_timer_resolution(ti);
392 if (ti->ccallback)
393 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
394 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
395 return;
396 timer = ti->timer;
397 if (timer == NULL)
398 return;
399 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
400 return;
401 spin_lock_irqsave(&timer->lock, flags);
402 list_for_each(n, &ti->slave_active_head) {
403 ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
404 if (ts->ccallback)
405 ts->ccallback(ti, event + 100, &tstamp, resolution);
406 }
407 spin_unlock_irqrestore(&timer->lock, flags);
408}
409
410static int snd_timer_start1(snd_timer_t *timer, snd_timer_instance_t *timeri, unsigned long sticks)
411{
412 list_del(&timeri->active_list);
413 list_add_tail(&timeri->active_list, &timer->active_list_head);
414 if (timer->running) {
415 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
416 goto __start_now;
417 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
418 timeri->flags |= SNDRV_TIMER_IFLG_START;
419 return 1; /* delayed start */
420 } else {
421 timer->sticks = sticks;
422 timer->hw.start(timer);
423 __start_now:
424 timer->running++;
425 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
426 return 0;
427 }
428}
429
430static int snd_timer_start_slave(snd_timer_instance_t *timeri)
431{
432 unsigned long flags;
433
434 spin_lock_irqsave(&slave_active_lock, flags);
435 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
436 if (timeri->master)
437 list_add_tail(&timeri->active_list, &timeri->master->slave_active_head);
438 spin_unlock_irqrestore(&slave_active_lock, flags);
439 return 1; /* delayed start */
440}
441
442/*
443 * start the timer instance
444 */
445int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks)
446{
447 snd_timer_t *timer;
448 int result = -EINVAL;
449 unsigned long flags;
450
451 if (timeri == NULL || ticks < 1)
452 return -EINVAL;
453 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
454 result = snd_timer_start_slave(timeri);
455 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
456 return result;
457 }
458 timer = timeri->timer;
459 if (timer == NULL)
460 return -EINVAL;
461 spin_lock_irqsave(&timer->lock, flags);
462 timeri->ticks = timeri->cticks = ticks;
463 timeri->pticks = 0;
464 result = snd_timer_start1(timer, timeri, ticks);
465 spin_unlock_irqrestore(&timer->lock, flags);
466 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
467 return result;
468}
469
470static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event)
471{
472 snd_timer_t *timer;
473 unsigned long flags;
474
475 snd_assert(timeri != NULL, return -ENXIO);
476
477 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
478 if (!keep_flag) {
479 spin_lock_irqsave(&slave_active_lock, flags);
480 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
481 spin_unlock_irqrestore(&slave_active_lock, flags);
482 }
483 goto __end;
484 }
485 timer = timeri->timer;
486 if (!timer)
487 return -EINVAL;
488 spin_lock_irqsave(&timer->lock, flags);
489 list_del_init(&timeri->ack_list);
490 list_del_init(&timeri->active_list);
491 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
492 !(--timer->running)) {
493 timer->hw.stop(timer);
494 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
495 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
496 snd_timer_reschedule(timer, 0);
497 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
498 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
499 timer->hw.start(timer);
500 }
501 }
502 }
503 if (!keep_flag)
504 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING|SNDRV_TIMER_IFLG_START);
505 spin_unlock_irqrestore(&timer->lock, flags);
506 __end:
507 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
508 snd_timer_notify1(timeri, event);
509 return 0;
510}
511
512/*
513 * stop the timer instance.
514 *
515 * do not call this from the timer callback!
516 */
517int snd_timer_stop(snd_timer_instance_t * timeri)
518{
519 snd_timer_t *timer;
520 unsigned long flags;
521 int err;
522
523 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
524 if (err < 0)
525 return err;
526 timer = timeri->timer;
527 spin_lock_irqsave(&timer->lock, flags);
528 timeri->cticks = timeri->ticks;
529 timeri->pticks = 0;
530 spin_unlock_irqrestore(&timer->lock, flags);
531 return 0;
532}
533
534/*
535 * start again.. the tick is kept.
536 */
537int snd_timer_continue(snd_timer_instance_t * timeri)
538{
539 snd_timer_t *timer;
540 int result = -EINVAL;
541 unsigned long flags;
542
543 if (timeri == NULL)
544 return result;
545 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
546 return snd_timer_start_slave(timeri);
547 timer = timeri->timer;
548 if (! timer)
549 return -EINVAL;
550 spin_lock_irqsave(&timer->lock, flags);
551 if (!timeri->cticks)
552 timeri->cticks = 1;
553 timeri->pticks = 0;
554 result = snd_timer_start1(timer, timeri, timer->sticks);
555 spin_unlock_irqrestore(&timer->lock, flags);
556 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
557 return result;
558}
559
560/*
561 * pause.. remember the ticks left
562 */
563int snd_timer_pause(snd_timer_instance_t * timeri)
564{
565 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
566}
567
568/*
569 * reschedule the timer
570 *
571 * start pending instances and check the scheduling ticks.
572 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
573 */
574static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left)
575{
576 snd_timer_instance_t *ti;
577 unsigned long ticks = ~0UL;
578 struct list_head *p;
579
580 list_for_each(p, &timer->active_list_head) {
581 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
582 if (ti->flags & SNDRV_TIMER_IFLG_START) {
583 ti->flags &= ~SNDRV_TIMER_IFLG_START;
584 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
585 timer->running++;
586 }
587 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
588 if (ticks > ti->cticks)
589 ticks = ti->cticks;
590 }
591 }
592 if (ticks == ~0UL) {
593 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
594 return;
595 }
596 if (ticks > timer->hw.ticks)
597 ticks = timer->hw.ticks;
598 if (ticks_left != ticks)
599 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
600 timer->sticks = ticks;
601}
602
603/*
604 * timer tasklet
605 *
606 */
607static void snd_timer_tasklet(unsigned long arg)
608{
609 snd_timer_t *timer = (snd_timer_t *) arg;
610 snd_timer_instance_t *ti;
611 struct list_head *p;
612 unsigned long resolution, ticks;
613
614 spin_lock(&timer->lock);
615 /* now process all callbacks */
616 while (!list_empty(&timer->sack_list_head)) {
617 p = timer->sack_list_head.next; /* get first item */
618 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
619
620 /* remove from ack_list and make empty */
621 list_del_init(p);
622
623 ticks = ti->pticks;
624 ti->pticks = 0;
625 resolution = ti->resolution;
626
627 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
628 spin_unlock(&timer->lock);
629 if (ti->callback)
630 ti->callback(ti, resolution, ticks);
631 spin_lock(&timer->lock);
632 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
633 }
634 spin_unlock(&timer->lock);
635}
636
637/*
638 * timer interrupt
639 *
640 * ticks_left is usually equal to timer->sticks.
641 *
642 */
643void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left)
644{
645 snd_timer_instance_t *ti, *ts;
646 unsigned long resolution, ticks;
647 struct list_head *p, *q, *n;
648 int use_tasklet = 0;
649
650 if (timer == NULL)
651 return;
652
653 spin_lock(&timer->lock);
654
655 /* remember the current resolution */
656 if (timer->hw.c_resolution)
657 resolution = timer->hw.c_resolution(timer);
658 else
659 resolution = timer->hw.resolution;
660
661 /* loop for all active instances
662 * here we cannot use list_for_each because the active_list of a processed
663 * instance is relinked to done_list_head before callback is called.
664 */
665 list_for_each_safe(p, n, &timer->active_list_head) {
666 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
667 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
668 continue;
669 ti->pticks += ticks_left;
670 ti->resolution = resolution;
671 if (ti->cticks < ticks_left)
672 ti->cticks = 0;
673 else
674 ti->cticks -= ticks_left;
675 if (ti->cticks) /* not expired */
676 continue;
677 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
678 ti->cticks = ti->ticks;
679 } else {
680 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
681 if (--timer->running)
682 list_del(p);
683 }
684 if (list_empty(&ti->ack_list)) {
685 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
686 (ti->flags & SNDRV_TIMER_IFLG_FAST)) {
687 list_add_tail(&ti->ack_list, &timer->ack_list_head);
688 } else {
689 list_add_tail(&ti->ack_list, &timer->sack_list_head);
690 }
691 }
692 list_for_each(q, &ti->slave_active_head) {
693 ts = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, active_list);
694 ts->pticks = ti->pticks;
695 ts->resolution = resolution;
696 if (list_empty(&ts->ack_list)) {
697 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
698 (ti->flags & SNDRV_TIMER_IFLG_FAST)) {
699 list_add_tail(&ts->ack_list, &timer->ack_list_head);
700 } else {
701 list_add_tail(&ts->ack_list, &timer->sack_list_head);
702 }
703 }
704 }
705 }
706 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
707 snd_timer_reschedule(timer, ticks_left);
708 if (timer->running) {
709 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
710 timer->hw.stop(timer);
711 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
712 }
713 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
714 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
715 /* restart timer */
716 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
717 timer->hw.start(timer);
718 }
719 } else {
720 timer->hw.stop(timer);
721 }
722
723 /* now process all fast callbacks */
724 while (!list_empty(&timer->ack_list_head)) {
725 p = timer->ack_list_head.next; /* get first item */
726 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
727
728 /* remove from ack_list and make empty */
729 list_del_init(p);
730
731 ticks = ti->pticks;
732 ti->pticks = 0;
733
734 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
735 spin_unlock(&timer->lock);
736 if (ti->callback)
737 ti->callback(ti, resolution, ticks);
738 spin_lock(&timer->lock);
739 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
740 }
741
742 /* do we have any slow callbacks? */
743 use_tasklet = !list_empty(&timer->sack_list_head);
744 spin_unlock(&timer->lock);
745
746 if (use_tasklet)
747 tasklet_hi_schedule(&timer->task_queue);
748}
749
750/*
751
752 */
753
754int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t ** rtimer)
755{
756 snd_timer_t *timer;
757 int err;
758 static snd_device_ops_t ops = {
759 .dev_free = snd_timer_dev_free,
760 .dev_register = snd_timer_dev_register,
761 .dev_unregister = snd_timer_dev_unregister
762 };
763
764 snd_assert(tid != NULL, return -EINVAL);
765 snd_assert(rtimer != NULL, return -EINVAL);
766 *rtimer = NULL;
767 timer = kcalloc(1, sizeof(*timer), GFP_KERNEL);
768 if (timer == NULL)
769 return -ENOMEM;
770 timer->tmr_class = tid->dev_class;
771 timer->card = card;
772 timer->tmr_device = tid->device;
773 timer->tmr_subdevice = tid->subdevice;
774 if (id)
775 strlcpy(timer->id, id, sizeof(timer->id));
776 INIT_LIST_HEAD(&timer->device_list);
777 INIT_LIST_HEAD(&timer->open_list_head);
778 INIT_LIST_HEAD(&timer->active_list_head);
779 INIT_LIST_HEAD(&timer->ack_list_head);
780 INIT_LIST_HEAD(&timer->sack_list_head);
781 spin_lock_init(&timer->lock);
782 tasklet_init(&timer->task_queue, snd_timer_tasklet, (unsigned long)timer);
783 if (card != NULL) {
784 if ((err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops)) < 0) {
785 snd_timer_free(timer);
786 return err;
787 }
788 }
789 *rtimer = timer;
790 return 0;
791}
792
793static int snd_timer_free(snd_timer_t *timer)
794{
795 snd_assert(timer != NULL, return -ENXIO);
796 if (timer->private_free)
797 timer->private_free(timer);
798 kfree(timer);
799 return 0;
800}
801
802int snd_timer_dev_free(snd_device_t *device)
803{
804 snd_timer_t *timer = device->device_data;
805 return snd_timer_free(timer);
806}
807
808int snd_timer_dev_register(snd_device_t *dev)
809{
810 snd_timer_t *timer = dev->device_data;
811 snd_timer_t *timer1;
812 struct list_head *p;
813
814 snd_assert(timer != NULL && timer->hw.start != NULL && timer->hw.stop != NULL, return -ENXIO);
815 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
816 !timer->hw.resolution && timer->hw.c_resolution == NULL)
817 return -EINVAL;
818
819 down(&register_mutex);
820 list_for_each(p, &snd_timer_list) {
821 timer1 = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
822 if (timer1->tmr_class > timer->tmr_class)
823 break;
824 if (timer1->tmr_class < timer->tmr_class)
825 continue;
826 if (timer1->card && timer->card) {
827 if (timer1->card->number > timer->card->number)
828 break;
829 if (timer1->card->number < timer->card->number)
830 continue;
831 }
832 if (timer1->tmr_device > timer->tmr_device)
833 break;
834 if (timer1->tmr_device < timer->tmr_device)
835 continue;
836 if (timer1->tmr_subdevice > timer->tmr_subdevice)
837 break;
838 if (timer1->tmr_subdevice < timer->tmr_subdevice)
839 continue;
840 /* conflicts.. */
841 up(&register_mutex);
842 return -EBUSY;
843 }
844 list_add_tail(&timer->device_list, p);
845 up(&register_mutex);
846 return 0;
847}
848
123992f7 849static int snd_timer_unregister(snd_timer_t *timer)
1da177e4
LT		 850{
851 struct list_head *p, *n;
852 snd_timer_instance_t *ti;
853
854 snd_assert(timer != NULL, return -ENXIO);
855 down(&register_mutex);
856 if (! list_empty(&timer->open_list_head)) {
857 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer);
858 list_for_each_safe(p, n, &timer->open_list_head) {
859 list_del_init(p);
860 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
861 ti->timer = NULL;
862 }
863 }
864 list_del(&timer->device_list);
865 up(&register_mutex);
866 return snd_timer_free(timer);
867}
868
869static int snd_timer_dev_unregister(snd_device_t *device)
870{
871 snd_timer_t *timer = device->device_data;
872 return snd_timer_unregister(timer);
873}
874
875void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, struct timespec *tstamp)
876{
877 unsigned long flags;
878 unsigned long resolution = 0;
879 snd_timer_instance_t *ti, *ts;
880 struct list_head *p, *n;
881
882 snd_runtime_check(timer->hw.flags & SNDRV_TIMER_HW_SLAVE, return);
883 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && event <= SNDRV_TIMER_EVENT_MPAUSE, return);
884 spin_lock_irqsave(&timer->lock, flags);
885 if (event == SNDRV_TIMER_EVENT_MSTART || event == SNDRV_TIMER_EVENT_MCONTINUE) {
886 if (timer->hw.c_resolution)
887 resolution = timer->hw.c_resolution(timer);
888 else
889 resolution = timer->hw.resolution;
890 }
891 list_for_each(p, &timer->active_list_head) {
892 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
893 if (ti->ccallback)
894 ti->ccallback(ti, event, tstamp, resolution);
895 list_for_each(n, &ti->slave_active_head) {
896 ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
897 if (ts->ccallback)
898 ts->ccallback(ts, event, tstamp, resolution);
899 }
900 }
901 spin_unlock_irqrestore(&timer->lock, flags);
902}
903
904/*
905 * exported functions for global timers
906 */
907int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer)
908{
909 snd_timer_id_t tid;
910
911 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
912 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
913 tid.card = -1;
914 tid.device = device;
915 tid.subdevice = 0;
916 return snd_timer_new(NULL, id, &tid, rtimer);
917}
918
919int snd_timer_global_free(snd_timer_t *timer)
920{
921 return snd_timer_free(timer);
922}
923
924int snd_timer_global_register(snd_timer_t *timer)
925{
926 snd_device_t dev;
927
928 memset(&dev, 0, sizeof(dev));
929 dev.device_data = timer;
930 return snd_timer_dev_register(&dev);
931}
932
933int snd_timer_global_unregister(snd_timer_t *timer)
934{
935 return snd_timer_unregister(timer);
936}
937
938/*
939 * System timer
940 */
941
942struct snd_timer_system_private {
943 struct timer_list tlist;
944 struct timer * timer;
945 unsigned long last_expires;
946 unsigned long last_jiffies;
947 unsigned long correction;
948};
949
1da177e4
LT		 950static void snd_timer_s_function(unsigned long data)
951{
952 snd_timer_t *timer = (snd_timer_t *)data;
953 struct snd_timer_system_private *priv = timer->private_data;
954 unsigned long jiff = jiffies;
955 if (time_after(jiff, priv->last_expires))
956 priv->correction = (long)jiff - (long)priv->last_expires;
957 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
958}
959
960static int snd_timer_s_start(snd_timer_t * timer)
961{
962 struct snd_timer_system_private *priv;
963 unsigned long njiff;
964
965 priv = (struct snd_timer_system_private *) timer->private_data;
966 njiff = (priv->last_jiffies = jiffies);
967 if (priv->correction > timer->sticks - 1) {
968 priv->correction -= timer->sticks - 1;
969 njiff++;
970 } else {
971 njiff += timer->sticks - priv->correction;
972 priv->correction -= timer->sticks;
973 }
974 priv->last_expires = priv->tlist.expires = njiff;
975 add_timer(&priv->tlist);
976 return 0;
977}
978
979static int snd_timer_s_stop(snd_timer_t * timer)
980{
981 struct snd_timer_system_private *priv;
982 unsigned long jiff;
983
984 priv = (struct snd_timer_system_private *) timer->private_data;
985 del_timer(&priv->tlist);
986 jiff = jiffies;
987 if (time_before(jiff, priv->last_expires))
988 timer->sticks = priv->last_expires - jiff;
989 else
990 timer->sticks = 1;
991 return 0;
992}
993
994static struct _snd_timer_hardware snd_timer_system =
995{
996 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
997 .resolution = 1000000000L / HZ,
998 .ticks = 10000000L,
999 .start = snd_timer_s_start,
1000 .stop = snd_timer_s_stop
1001};
1002
1003static void snd_timer_free_system(snd_timer_t *timer)
1004{
1005 kfree(timer->private_data);
1006}
1007
1008static int snd_timer_register_system(void)
1009{
1010 snd_timer_t *timer;
1011 struct snd_timer_system_private *priv;
1012 int err;
1013
1014 if ((err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer)) < 0)
1015 return err;
1016 strcpy(timer->name, "system timer");
1017 timer->hw = snd_timer_system;
1018 priv = kcalloc(1, sizeof(*priv), GFP_KERNEL);
1019 if (priv == NULL) {
1020 snd_timer_free(timer);
1021 return -ENOMEM;
1022 }
1023 init_timer(&priv->tlist);
1024 priv->tlist.function = snd_timer_s_function;
1025 priv->tlist.data = (unsigned long) timer;
1026 timer->private_data = priv;
1027 timer->private_free = snd_timer_free_system;
1028 return snd_timer_global_register(timer);
1029}
1030
1031/*
1032 * Info interface
1033 */
1034
1035static void snd_timer_proc_read(snd_info_entry_t *entry,
1036 snd_info_buffer_t * buffer)
1037{
1038 unsigned long flags;
1039 snd_timer_t *timer;
1040 snd_timer_instance_t *ti;
1041 struct list_head *p, *q;
1042
1043 down(&register_mutex);
1044 list_for_each(p, &snd_timer_list) {
1045 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1046 switch (timer->tmr_class) {
1047 case SNDRV_TIMER_CLASS_GLOBAL:
1048 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1049 break;
1050 case SNDRV_TIMER_CLASS_CARD:
1051 snd_iprintf(buffer, "C%i-%i: ", timer->card->number, timer->tmr_device);
1052 break;
1053 case SNDRV_TIMER_CLASS_PCM:
1054 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, timer->tmr_device, timer->tmr_subdevice);
1055 break;
1056 default:
1057 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, timer->card ? timer->card->number : -1, timer->tmr_device, timer->tmr_subdevice);
1058 }
1059 snd_iprintf(buffer, "%s :", timer->name);
1060 if (timer->hw.resolution)
1061 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", timer->hw.resolution / 1000, timer->hw.resolution % 1000, timer->hw.ticks);
1062 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1063 snd_iprintf(buffer, " SLAVE");
1064 snd_iprintf(buffer, "\n");
1065 spin_lock_irqsave(&timer->lock, flags);
1066 list_for_each(q, &timer->open_list_head) {
1067 ti = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list);
1068 snd_iprintf(buffer, " Client %s : %s : lost interrupts %li\n",
1069 ti->owner ? ti->owner : "unknown",
1070 ti->flags & (SNDRV_TIMER_IFLG_START|SNDRV_TIMER_IFLG_RUNNING) ? "running" : "stopped",
1071 ti->lost);
1072 }
1073 spin_unlock_irqrestore(&timer->lock, flags);
1074 }
1075 up(&register_mutex);
1076}
1077
1078/*
1079 * USER SPACE interface
1080 */
1081
1082static void snd_timer_user_interrupt(snd_timer_instance_t *timeri,
1083 unsigned long resolution,
1084 unsigned long ticks)
1085{
1086 snd_timer_user_t *tu = timeri->callback_data;
1087 snd_timer_read_t *r;
1088 int prev;
1089
1090 spin_lock(&tu->qlock);
1091 if (tu->qused > 0) {
1092 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1093 r = &tu->queue[prev];
1094 if (r->resolution == resolution) {
1095 r->ticks += ticks;
1096 goto __wake;
1097 }
1098 }
1099 if (tu->qused >= tu->queue_size) {
1100 tu->overrun++;
1101 } else {
1102 r = &tu->queue[tu->qtail++];
1103 tu->qtail %= tu->queue_size;
1104 r->resolution = resolution;
1105 r->ticks = ticks;
1106 tu->qused++;
1107 }
1108 __wake:
1109 spin_unlock(&tu->qlock);
1110 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1111 wake_up(&tu->qchange_sleep);
1112}
1113
1114static void snd_timer_user_append_to_tqueue(snd_timer_user_t *tu, snd_timer_tread_t *tread)
1115{
1116 if (tu->qused >= tu->queue_size) {
1117 tu->overrun++;
1118 } else {
1119 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1120 tu->qtail %= tu->queue_size;
1121 tu->qused++;
1122 }
1123}
1124
1125static void snd_timer_user_ccallback(snd_timer_instance_t *timeri,
1126 enum sndrv_timer_event event,
1127 struct timespec *tstamp,
1128 unsigned long resolution)
1129{
1130 snd_timer_user_t *tu = timeri->callback_data;
1131 snd_timer_tread_t r1;
1132
1133 if (event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE)
1134 tu->tstamp = *tstamp;
1135 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1136 return;
1137 r1.event = event;
1138 r1.tstamp = *tstamp;
1139 r1.val = resolution;
1140 spin_lock(&tu->qlock);
1141 snd_timer_user_append_to_tqueue(tu, &r1);
1142 spin_unlock(&tu->qlock);
1143 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1144 wake_up(&tu->qchange_sleep);
1145}
1146
1147static void snd_timer_user_tinterrupt(snd_timer_instance_t *timeri,
1148 unsigned long resolution,
1149 unsigned long ticks)
1150{
1151 snd_timer_user_t *tu = timeri->callback_data;
1152 snd_timer_tread_t *r, r1;
1153 struct timespec tstamp;
1154 int prev, append = 0;
1155
1156 snd_timestamp_zero(&tstamp);
1157 spin_lock(&tu->qlock);
1158 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION)|(1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1159 spin_unlock(&tu->qlock);
1160 return;
1161 }
1162 if (tu->last_resolution != resolution || ticks > 0)
1163 snd_timestamp_now(&tstamp, 1);
1164 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && tu->last_resolution != resolution) {
1165 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1166 r1.tstamp = tstamp;
1167 r1.val = resolution;
1168 snd_timer_user_append_to_tqueue(tu, &r1);
1169 tu->last_resolution = resolution;
1170 append++;
1171 }
1172 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1173 goto __wake;
1174 if (ticks == 0)
1175 goto __wake;
1176 if (tu->qused > 0) {
1177 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1178 r = &tu->tqueue[prev];
1179 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1180 r->tstamp = tstamp;
1181 r->val += ticks;
1182 append++;
1183 goto __wake;
1184 }
1185 }
1186 r1.event = SNDRV_TIMER_EVENT_TICK;
1187 r1.tstamp = tstamp;
1188 r1.val = ticks;
1189 snd_timer_user_append_to_tqueue(tu, &r1);
1190 append++;
1191 __wake:
1192 spin_unlock(&tu->qlock);
1193 if (append == 0)
1194 return;
1195 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1196 wake_up(&tu->qchange_sleep);
1197}
1198
1199static int snd_timer_user_open(struct inode *inode, struct file *file)
1200{
1201 snd_timer_user_t *tu;
1202
1203 tu = kcalloc(1, sizeof(*tu), GFP_KERNEL);
1204 if (tu == NULL)
1205 return -ENOMEM;
1206 spin_lock_init(&tu->qlock);
1207 init_waitqueue_head(&tu->qchange_sleep);
c1935b4d 1208 init_MUTEX(&tu->tread_sem);
1da177e4
LT		 1209 tu->ticks = 1;
1210 tu->queue_size = 128;
1211 tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1212 if (tu->queue == NULL) {
1213 kfree(tu);
1214 return -ENOMEM;
1215 }
1216 file->private_data = tu;
1217 return 0;
1218}
1219
1220static int snd_timer_user_release(struct inode *inode, struct file *file)
1221{
1222 snd_timer_user_t *tu;
1223
1224 if (file->private_data) {
1225 tu = file->private_data;
1226 file->private_data = NULL;
1227 fasync_helper(-1, file, 0, &tu->fasync);
1228 if (tu->timeri)
1229 snd_timer_close(tu->timeri);
1230 kfree(tu->queue);
1231 kfree(tu->tqueue);
1232 kfree(tu);
1233 }
1234 return 0;
1235}
1236
1237static void snd_timer_user_zero_id(snd_timer_id_t *id)
1238{
1239 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1240 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1241 id->card = -1;
1242 id->device = -1;
1243 id->subdevice = -1;
1244}
1245
1246static void snd_timer_user_copy_id(snd_timer_id_t *id, snd_timer_t *timer)
1247{
1248 id->dev_class = timer->tmr_class;
1249 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1250 id->card = timer->card ? timer->card->number : -1;
1251 id->device = timer->tmr_device;
1252 id->subdevice = timer->tmr_subdevice;
1253}
1254
1255static int snd_timer_user_next_device(snd_timer_id_t __user *_tid)
1256{
1257 snd_timer_id_t id;
1258 snd_timer_t *timer;
1259 struct list_head *p;
1260
1261 if (copy_from_user(&id, _tid, sizeof(id)))
1262 return -EFAULT;
1263 down(&register_mutex);
1264 if (id.dev_class < 0) { /* first item */
1265 if (list_empty(&snd_timer_list))
1266 snd_timer_user_zero_id(&id);
1267 else {
1268 timer = (snd_timer_t *)list_entry(snd_timer_list.next, snd_timer_t, device_list);
1269 snd_timer_user_copy_id(&id, timer);
1270 }
1271 } else {
1272 switch (id.dev_class) {
1273 case SNDRV_TIMER_CLASS_GLOBAL:
1274 id.device = id.device < 0 ? 0 : id.device + 1;
1275 list_for_each(p, &snd_timer_list) {
1276 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1277 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1278 snd_timer_user_copy_id(&id, timer);
1279 break;
1280 }
1281 if (timer->tmr_device >= id.device) {
1282 snd_timer_user_copy_id(&id, timer);
1283 break;
1284 }
1285 }
1286 if (p == &snd_timer_list)
1287 snd_timer_user_zero_id(&id);
1288 break;
1289 case SNDRV_TIMER_CLASS_CARD:
1290 case SNDRV_TIMER_CLASS_PCM:
1291 if (id.card < 0) {
1292 id.card = 0;
1293 } else {
1294 if (id.card < 0) {
1295 id.card = 0;
1296 } else {
1297 if (id.device < 0) {
1298 id.device = 0;
1299 } else {
1300 id.subdevice = id.subdevice < 0 ? 0 : id.subdevice + 1;
1301 }
1302 }
1303 }
1304 list_for_each(p, &snd_timer_list) {
1305 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1306 if (timer->tmr_class > id.dev_class) {
1307 snd_timer_user_copy_id(&id, timer);
1308 break;
1309 }
1310 if (timer->tmr_class < id.dev_class)
1311 continue;
1312 if (timer->card->number > id.card) {
1313 snd_timer_user_copy_id(&id, timer);
1314 break;
1315 }
1316 if (timer->card->number < id.card)
1317 continue;
1318 if (timer->tmr_device > id.device) {
1319 snd_timer_user_copy_id(&id, timer);
1320 break;
1321 }
1322 if (timer->tmr_device < id.device)
1323 continue;
1324 if (timer->tmr_subdevice > id.subdevice) {
1325 snd_timer_user_copy_id(&id, timer);
1326 break;
1327 }
1328 if (timer->tmr_subdevice < id.subdevice)
1329 continue;
1330 snd_timer_user_copy_id(&id, timer);
1331 break;
1332 }
1333 if (p == &snd_timer_list)
1334 snd_timer_user_zero_id(&id);
1335 break;
1336 default:
1337 snd_timer_user_zero_id(&id);
1338 }
1339 }
1340 up(&register_mutex);
1341 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1342 return -EFAULT;
1343 return 0;
1344}
1345
1346static int snd_timer_user_ginfo(struct file *file, snd_timer_ginfo_t __user *_ginfo)
1347{
1348 snd_timer_ginfo_t *ginfo;
1349 snd_timer_id_t tid;
1350 snd_timer_t *t;
1351 struct list_head *p;
1352 int err = 0;
1353
1354 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1355 if (! ginfo)
1356 return -ENOMEM;
1357 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1358 kfree(ginfo);
1359 return -EFAULT;
1360 }
1361 tid = ginfo->tid;
1362 memset(ginfo, 0, sizeof(*ginfo));
1363 ginfo->tid = tid;
1364 down(&register_mutex);
1365 t = snd_timer_find(&tid);
1366 if (t != NULL) {
1367 ginfo->card = t->card ? t->card->number : -1;
1368 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1369 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1370 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1371 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1372 ginfo->resolution = t->hw.resolution;
1373 if (t->hw.resolution_min > 0) {
1374 ginfo->resolution_min = t->hw.resolution_min;
1375 ginfo->resolution_max = t->hw.resolution_max;
1376 }
1377 list_for_each(p, &t->open_list_head) {
1378 ginfo->clients++;
1379 }
1380 } else {
1381 err = -ENODEV;
1382 }
1383 up(&register_mutex);
1384 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1385 err = -EFAULT;
1386 kfree(ginfo);
1387 return err;
1388}
1389
1390static int snd_timer_user_gparams(struct file *file, snd_timer_gparams_t __user *_gparams)
1391{
1392 snd_timer_gparams_t gparams;
1393 snd_timer_t *t;
1394 int err;
1395
1396 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1397 return -EFAULT;
1398 down(&register_mutex);
1399 t = snd_timer_find(&gparams.tid);
1400 if (t != NULL) {
1401 if (list_empty(&t->open_list_head)) {
1402 if (t->hw.set_period)
1403 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1404 else
1405 err = -ENOSYS;
1406 } else {
1407 err = -EBUSY;
1408 }
1409 } else {
1410 err = -ENODEV;
1411 }
1412 up(&register_mutex);
1413 return err;
1414}
1415
1416static int snd_timer_user_gstatus(struct file *file, snd_timer_gstatus_t __user *_gstatus)
1417{
1418 snd_timer_gstatus_t gstatus;
1419 snd_timer_id_t tid;
1420 snd_timer_t *t;
1421 int err = 0;
1422
1423 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1424 return -EFAULT;
1425 tid = gstatus.tid;
1426 memset(&gstatus, 0, sizeof(gstatus));
1427 gstatus.tid = tid;
1428 down(&register_mutex);
1429 t = snd_timer_find(&tid);
1430 if (t != NULL) {
1431 if (t->hw.c_resolution)
1432 gstatus.resolution = t->hw.c_resolution(t);
1433 else
1434 gstatus.resolution = t->hw.resolution;
1435 if (t->hw.precise_resolution) {
1436 t->hw.precise_resolution(t, &gstatus.resolution_num, &gstatus.resolution_den);
1437 } else {
1438 gstatus.resolution_num = gstatus.resolution;
1439 gstatus.resolution_den = 1000000000uL;
1440 }
1441 } else {
1442 err = -ENODEV;
1443 }
1444 up(&register_mutex);
1445 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1446 err = -EFAULT;
1447 return err;
1448}
1449
1450static int snd_timer_user_tselect(struct file *file, snd_timer_select_t __user *_tselect)
1451{
1452 snd_timer_user_t *tu;
1453 snd_timer_select_t tselect;
1454 char str[32];
c1935b4d 1455 int err = 0;
1da177e4
LT		 1456
1457 tu = file->private_data;
c1935b4d
JK		 1458 down(&tu->tread_sem);
1459 if (tu->timeri) {
1da177e4 1460 snd_timer_close(tu->timeri);
c1935b4d
JK		 1461 tu->timeri = NULL;
1462 }
1463 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1464 err = -EFAULT;
1465 goto __err;
1466 }
1da177e4
LT		 1467 sprintf(str, "application %i", current->pid);
1468 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1469 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1470 if ((err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid)) < 0)
c1935b4d 1471 goto __err;
1da177e4 1472
4d572776
JJ		 1473 kfree(tu->queue);
1474 tu->queue = NULL;
1475 kfree(tu->tqueue);
1476 tu->tqueue = NULL;
1da177e4
LT		 1477 if (tu->tread) {
1478 tu->tqueue = (snd_timer_tread_t *)kmalloc(tu->queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
c1935b4d
JK		 1479 if (tu->tqueue == NULL)
1480 err = -ENOMEM;
1da177e4
LT		 1481 } else {
1482 tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
c1935b4d
JK		 1483 if (tu->queue == NULL)
1484 err = -ENOMEM;
1da177e4
LT		 1485 }
1486
c1935b4d
JK		 1487 if (err < 0) {
1488 snd_timer_close(tu->timeri);
1489 tu->timeri = NULL;
1490 } else {
1491 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1492 tu->timeri->callback = tu->tread ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1493 tu->timeri->ccallback = snd_timer_user_ccallback;
1494 tu->timeri->callback_data = (void *)tu;
1495 }
1496
1497 __err:
1498 up(&tu->tread_sem);
1499 return err;
1da177e4
LT		 1500}
1501
1502static int snd_timer_user_info(struct file *file, snd_timer_info_t __user *_info)
1503{
1504 snd_timer_user_t *tu;
1505 snd_timer_info_t *info;
1506 snd_timer_t *t;
1507 int err = 0;
1508
1509 tu = file->private_data;
1510 snd_assert(tu->timeri != NULL, return -ENXIO);
1511 t = tu->timeri->timer;
1512 snd_assert(t != NULL, return -ENXIO);
1513
1514 info = kcalloc(1, sizeof(*info), GFP_KERNEL);
1515 if (! info)
1516 return -ENOMEM;
1517 info->card = t->card ? t->card->number : -1;
1518 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1519 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1520 strlcpy(info->id, t->id, sizeof(info->id));
1521 strlcpy(info->name, t->name, sizeof(info->name));
1522 info->resolution = t->hw.resolution;
1523 if (copy_to_user(_info, info, sizeof(*_info)))
1524 err = -EFAULT;
1525 kfree(info);
1526 return err;
1527}
1528
1529static int snd_timer_user_params(struct file *file, snd_timer_params_t __user *_params)
1530{
1531 snd_timer_user_t *tu;
1532 snd_timer_params_t params;
1533 snd_timer_t *t;
1534 snd_timer_read_t *tr;
1535 snd_timer_tread_t *ttr;
1536 int err;
1537
1538 tu = file->private_data;
1539 snd_assert(tu->timeri != NULL, return -ENXIO);
1540 t = tu->timeri->timer;
1541 snd_assert(t != NULL, return -ENXIO);
1542 if (copy_from_user(&params, _params, sizeof(params)))
1543 return -EFAULT;
1544 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1545 err = -EINVAL;
1546 goto _end;
1547 }
1548 if (params.queue_size > 0 && (params.queue_size < 32 || params.queue_size > 1024)) {
1549 err = -EINVAL;
1550 goto _end;
1551 }
1552 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1553 (1<<SNDRV_TIMER_EVENT_TICK)|
1554 (1<<SNDRV_TIMER_EVENT_START)|
1555 (1<<SNDRV_TIMER_EVENT_STOP)|
1556 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1557 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1558 (1<<SNDRV_TIMER_EVENT_MSTART)|
1559 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1560 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1561 (1<<SNDRV_TIMER_EVENT_MPAUSE))) {
1562 err = -EINVAL;
1563 goto _end;
1564 }
1565 snd_timer_stop(tu->timeri);
1566 spin_lock_irq(&t->lock);
1567 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1568 SNDRV_TIMER_IFLG_EXCLUSIVE|
1569 SNDRV_TIMER_IFLG_EARLY_EVENT);
1570 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1571 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1572 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1573 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1574 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1575 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1576 spin_unlock_irq(&t->lock);
1577 if (params.queue_size > 0 && (unsigned int)tu->queue_size != params.queue_size) {
1578 if (tu->tread) {
1579 ttr = (snd_timer_tread_t *)kmalloc(params.queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
1580 if (ttr) {
1581 kfree(tu->tqueue);
1582 tu->queue_size = params.queue_size;
1583 tu->tqueue = ttr;
1584 }
1585 } else {
1586 tr = (snd_timer_read_t *)kmalloc(params.queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1587 if (tr) {
1588 kfree(tu->queue);
1589 tu->queue_size = params.queue_size;
1590 tu->queue = tr;
1591 }
1592 }
1593 }
1594 tu->qhead = tu->qtail = tu->qused = 0;
1595 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1596 if (tu->tread) {
1597 snd_timer_tread_t tread;
1598 tread.event = SNDRV_TIMER_EVENT_EARLY;
1599 tread.tstamp.tv_sec = 0;
1600 tread.tstamp.tv_nsec = 0;
1601 tread.val = 0;
1602 snd_timer_user_append_to_tqueue(tu, &tread);
1603 } else {
1604 snd_timer_read_t *r = &tu->queue[0];
1605 r->resolution = 0;
1606 r->ticks = 0;
1607 tu->qused++;
1608 tu->qtail++;
1609 }
1610
1611 }
1612 tu->filter = params.filter;
1613 tu->ticks = params.ticks;
1614 err = 0;
1615 _end:
1616 if (copy_to_user(_params, &params, sizeof(params)))
1617 return -EFAULT;
1618 return err;
1619}
1620
1621static int snd_timer_user_status(struct file *file, snd_timer_status_t __user *_status)
1622{
1623 snd_timer_user_t *tu;
1624 snd_timer_status_t status;
1625
1626 tu = file->private_data;
1627 snd_assert(tu->timeri != NULL, return -ENXIO);
1628 memset(&status, 0, sizeof(status));
1629 status.tstamp = tu->tstamp;
1630 status.resolution = snd_timer_resolution(tu->timeri);
1631 status.lost = tu->timeri->lost;
1632 status.overrun = tu->overrun;
1633 spin_lock_irq(&tu->qlock);
1634 status.queue = tu->qused;
1635 spin_unlock_irq(&tu->qlock);
1636 if (copy_to_user(_status, &status, sizeof(status)))
1637 return -EFAULT;
1638 return 0;
1639}
1640
1641static int snd_timer_user_start(struct file *file)
1642{
1643 int err;
1644 snd_timer_user_t *tu;
1645
1646 tu = file->private_data;
1647 snd_assert(tu->timeri != NULL, return -ENXIO);
1648 snd_timer_stop(tu->timeri);
1649 tu->timeri->lost = 0;
1650 tu->last_resolution = 0;
1651 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1652}
1653
1654static int snd_timer_user_stop(struct file *file)
1655{
1656 int err;
1657 snd_timer_user_t *tu;
1658
1659 tu = file->private_data;
1660 snd_assert(tu->timeri != NULL, return -ENXIO);
1661 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1662}
1663
1664static int snd_timer_user_continue(struct file *file)
1665{
1666 int err;
1667 snd_timer_user_t *tu;
1668
1669 tu = file->private_data;
1670 snd_assert(tu->timeri != NULL, return -ENXIO);
1671 tu->timeri->lost = 0;
1672 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1673}
1674
15790a6b
TI		 1675static int snd_timer_user_pause(struct file *file)
1676{
1677 int err;
1678 snd_timer_user_t *tu;
1679
1680 tu = file->private_data;
1681 snd_assert(tu->timeri != NULL, return -ENXIO);
d138b445 1682 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
15790a6b
TI		 1683}
1684
8c50b37c
TI		 1685enum {
1686 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1687 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1688 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1689 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1690};
1691
1da177e4
LT		 1692static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1693{
1694 snd_timer_user_t *tu;
1695 void __user *argp = (void __user *)arg;
1696 int __user *p = argp;
1697
1698 tu = file->private_data;
1699 switch (cmd) {
1700 case SNDRV_TIMER_IOCTL_PVERSION:
1701 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1702 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1703 return snd_timer_user_next_device(argp);
1704 case SNDRV_TIMER_IOCTL_TREAD:
1705 {
1706 int xarg;
1707
c1935b4d
JK		 1708 down(&tu->tread_sem);
1709 if (tu->timeri) { /* too late */
1710 up(&tu->tread_sem);
1da177e4 1711 return -EBUSY;
c1935b4d
JK		 1712 }
1713 if (get_user(xarg, p)) {
1714 up(&tu->tread_sem);
1da177e4 1715 return -EFAULT;
c1935b4d 1716 }
1da177e4 1717 tu->tread = xarg ? 1 : 0;
c1935b4d 1718 up(&tu->tread_sem);
1da177e4
LT		 1719 return 0;
1720 }
1721 case SNDRV_TIMER_IOCTL_GINFO:
1722 return snd_timer_user_ginfo(file, argp);
1723 case SNDRV_TIMER_IOCTL_GPARAMS:
1724 return snd_timer_user_gparams(file, argp);
1725 case SNDRV_TIMER_IOCTL_GSTATUS:
1726 return snd_timer_user_gstatus(file, argp);
1727 case SNDRV_TIMER_IOCTL_SELECT:
1728 return snd_timer_user_tselect(file, argp);
1729 case SNDRV_TIMER_IOCTL_INFO:
1730 return snd_timer_user_info(file, argp);
1731 case SNDRV_TIMER_IOCTL_PARAMS:
1732 return snd_timer_user_params(file, argp);
1733 case SNDRV_TIMER_IOCTL_STATUS:
1734 return snd_timer_user_status(file, argp);
1735 case SNDRV_TIMER_IOCTL_START:
8c50b37c 1736 case SNDRV_TIMER_IOCTL_START_OLD:
1da177e4
LT		 1737 return snd_timer_user_start(file);
1738 case SNDRV_TIMER_IOCTL_STOP:
8c50b37c 1739 case SNDRV_TIMER_IOCTL_STOP_OLD:
1da177e4
LT		 1740 return snd_timer_user_stop(file);
1741 case SNDRV_TIMER_IOCTL_CONTINUE:
8c50b37c 1742 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1da177e4 1743 return snd_timer_user_continue(file);
15790a6b 1744 case SNDRV_TIMER_IOCTL_PAUSE:
8c50b37c 1745 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
15790a6b 1746 return snd_timer_user_pause(file);
1da177e4
LT		 1747 }
1748 return -ENOTTY;
1749}
1750
1751static int snd_timer_user_fasync(int fd, struct file * file, int on)
1752{
1753 snd_timer_user_t *tu;
1754 int err;
1755
1756 tu = file->private_data;
1757 err = fasync_helper(fd, file, on, &tu->fasync);
1758 if (err < 0)
1759 return err;
1760 return 0;
1761}
1762
1763static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
1764{
1765 snd_timer_user_t *tu;
1766 long result = 0, unit;
1767 int err = 0;
1768
1769 tu = file->private_data;
1770 unit = tu->tread ? sizeof(snd_timer_tread_t) : sizeof(snd_timer_read_t);
1771 spin_lock_irq(&tu->qlock);
1772 while ((long)count - result >= unit) {
1773 while (!tu->qused) {
1774 wait_queue_t wait;
1775
1776 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1777 err = -EAGAIN;
1778 break;
1779 }
1780
1781 set_current_state(TASK_INTERRUPTIBLE);
1782 init_waitqueue_entry(&wait, current);
1783 add_wait_queue(&tu->qchange_sleep, &wait);
1784
1785 spin_unlock_irq(&tu->qlock);
1786 schedule();
1787 spin_lock_irq(&tu->qlock);
1788
1789 remove_wait_queue(&tu->qchange_sleep, &wait);
1790
1791 if (signal_pending(current)) {
1792 err = -ERESTARTSYS;
1793 break;
1794 }
1795 }
1796
1797 spin_unlock_irq(&tu->qlock);
1798 if (err < 0)
1799 goto _error;
1800
1801 if (tu->tread) {
1802 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], sizeof(snd_timer_tread_t))) {
1803 err = -EFAULT;
1804 goto _error;
1805 }
1806 } else {
1807 if (copy_to_user(buffer, &tu->queue[tu->qhead++], sizeof(snd_timer_read_t))) {
1808 err = -EFAULT;
1809 goto _error;
1810 }
1811 }
1812
1813 tu->qhead %= tu->queue_size;
1814
1815 result += unit;
1816 buffer += unit;
1817
1818 spin_lock_irq(&tu->qlock);
1819 tu->qused--;
1820 }
1821 spin_unlock_irq(&tu->qlock);
1822 _error:
1823 return result > 0 ? result : err;
1824}
1825
1826static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1827{
1828 unsigned int mask;
1829 snd_timer_user_t *tu;
1830
1831 tu = file->private_data;
1832
1833 poll_wait(file, &tu->qchange_sleep, wait);
1834
1835 mask = 0;
1836 if (tu->qused)
1837 mask |= POLLIN | POLLRDNORM;
1838
1839 return mask;
1840}
1841
1842#ifdef CONFIG_COMPAT
1843#include "timer_compat.c"
1844#else
1845#define snd_timer_user_ioctl_compat NULL
1846#endif
1847
1848static struct file_operations snd_timer_f_ops =
1849{
1850 .owner = THIS_MODULE,
1851 .read = snd_timer_user_read,
1852 .open = snd_timer_user_open,
1853 .release = snd_timer_user_release,
1854 .poll = snd_timer_user_poll,
1855 .unlocked_ioctl = snd_timer_user_ioctl,
1856 .compat_ioctl = snd_timer_user_ioctl_compat,
1857 .fasync = snd_timer_user_fasync,
1858};
1859
1860static snd_minor_t snd_timer_reg =
1861{
1862 .comment = "timer",
1863 .f_ops = &snd_timer_f_ops,
1864};
1865
1866/*
1867 * ENTRY functions
1868 */
1869
1870static snd_info_entry_t *snd_timer_proc_entry = NULL;
1871
1872static int __init alsa_timer_init(void)
1873{
1874 int err;
1875 snd_info_entry_t *entry;
1876
1877#ifdef SNDRV_OSS_INFO_DEV_TIMERS
1878 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, "system timer");
1879#endif
1880 if ((entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL)) != NULL) {
1881 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128;
1882 entry->c.text.read = snd_timer_proc_read;
1883 if (snd_info_register(entry) < 0) {
1884 snd_info_free_entry(entry);
1885 entry = NULL;
1886 }
1887 }
1888 snd_timer_proc_entry = entry;
1889 if ((err = snd_timer_register_system()) < 0)
1890 snd_printk(KERN_ERR "unable to register system timer (%i)\n", err);
1891 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER,
1892 NULL, 0, &snd_timer_reg, "timer"))<0)
1893 snd_printk(KERN_ERR "unable to register timer device (%i)\n", err);
1894 return 0;
1895}
1896
1897static void __exit alsa_timer_exit(void)
1898{
1899 struct list_head *p, *n;
1900
1901 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1902 /* unregister the system timer */
1903 list_for_each_safe(p, n, &snd_timer_list) {
1904 snd_timer_t *timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1905 snd_timer_unregister(timer);
1906 }
1907 if (snd_timer_proc_entry) {
1908 snd_info_unregister(snd_timer_proc_entry);
1909 snd_timer_proc_entry = NULL;
1910 }
1911#ifdef SNDRV_OSS_INFO_DEV_TIMERS
1912 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1913#endif
1914}
1915
1916module_init(alsa_timer_init)
1917module_exit(alsa_timer_exit)
1918
1919EXPORT_SYMBOL(snd_timer_open);
1920EXPORT_SYMBOL(snd_timer_close);
1921EXPORT_SYMBOL(snd_timer_resolution);
1922EXPORT_SYMBOL(snd_timer_start);
1923EXPORT_SYMBOL(snd_timer_stop);
1924EXPORT_SYMBOL(snd_timer_continue);
1925EXPORT_SYMBOL(snd_timer_pause);
1926EXPORT_SYMBOL(snd_timer_new);
1927EXPORT_SYMBOL(snd_timer_notify);
1928EXPORT_SYMBOL(snd_timer_global_new);
1929EXPORT_SYMBOL(snd_timer_global_free);
1930EXPORT_SYMBOL(snd_timer_global_register);
1931EXPORT_SYMBOL(snd_timer_global_unregister);
1932EXPORT_SYMBOL(snd_timer_interrupt);
Linux kernel - Deliverables
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