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[SCSI] sg and st unmap_user_pages allow PageReserved
[linux-2.6.22.y-op.git] / sound / core / timer.c
blob1b90a38d10ff4a261bfc06c575e2a3f169f70224
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>
29 #include <linux/string.h>
30 #include <sound/core.h>
31 #include <sound/timer.h>
32 #include <sound/control.h>
33 #include <sound/info.h>
34 #include <sound/minors.h>
35 #include <sound/initval.h>
36 #include <linux/kmod.h>
37 #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
49 static int timer_limit = DEFAULT_TIMER_LIMIT;
50 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>");
51 MODULE_DESCRIPTION("ALSA timer interface");
52 MODULE_LICENSE("GPL");
53 module_param(timer_limit, int, 0444);
54 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
55
56 typedef 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;
73 struct semaphore tread_sem;
74 } snd_timer_user_t;
75
76 /* list of timers */
77 static LIST_HEAD(snd_timer_list);
78
79 /* list of slave instances */
80 static LIST_HEAD(snd_timer_slave_list);
81
82 /* lock for slave active lists */
83 static DEFINE_SPINLOCK(slave_active_lock);
84
85 static DECLARE_MUTEX(register_mutex);
86
87 static int snd_timer_free(snd_timer_t *timer);
88 static int snd_timer_dev_free(snd_device_t *device);
89 static int snd_timer_dev_register(snd_device_t *device);
90 static int snd_timer_dev_unregister(snd_device_t *device);
91
92 static 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 */
98 static snd_timer_instance_t *snd_timer_instance_new(char *owner,
99 snd_timer_t *timer)
100 {
101 snd_timer_instance_t *timeri;
102 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
103 if (timeri == NULL)
104 return NULL;
105 timeri->owner = kstrdup(owner, GFP_KERNEL);
106 if (! timeri->owner) {
107 kfree(timeri);
108 return NULL;
109 }
110 INIT_LIST_HEAD(&timeri->open_list);
111 INIT_LIST_HEAD(&timeri->active_list);
112 INIT_LIST_HEAD(&timeri->ack_list);
113 INIT_LIST_HEAD(&timeri->slave_list_head);
114 INIT_LIST_HEAD(&timeri->slave_active_head);
115
116 timeri->timer = timer;
117 if (timer && !try_module_get(timer->module)) {
118 kfree(timeri->owner);
119 kfree(timeri);
120 return NULL;
121 }
122
123 return timeri;
124 }
125
126 /*
127 * find a timer instance from the given timer id
128 */
129 static snd_timer_t *snd_timer_find(snd_timer_id_t *tid)
130 {
131 snd_timer_t *timer = NULL;
132 struct list_head *p;
133
134 list_for_each(p, &snd_timer_list) {
135 timer = list_entry(p, snd_timer_t, device_list);
136
137 if (timer->tmr_class != tid->dev_class)
138 continue;
139 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
140 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
141 (timer->card == NULL ||
142 timer->card->number != tid->card))
143 continue;
144 if (timer->tmr_device != tid->device)
145 continue;
146 if (timer->tmr_subdevice != tid->subdevice)
147 continue;
148 return timer;
149 }
150 return NULL;
151 }
152
153 #ifdef CONFIG_KMOD
154
155 static void snd_timer_request(snd_timer_id_t *tid)
156 {
157 if (! current->fs->root)
158 return;
159 switch (tid->dev_class) {
160 case SNDRV_TIMER_CLASS_GLOBAL:
161 if (tid->device < timer_limit)
162 request_module("snd-timer-%i", tid->device);
163 break;
164 case SNDRV_TIMER_CLASS_CARD:
165 case SNDRV_TIMER_CLASS_PCM:
166 if (tid->card < snd_ecards_limit)
167 request_module("snd-card-%i", tid->card);
168 break;
169 default:
170 break;
171 }
172 }
173
174 #endif
175
176 /*
177 * look for a master instance matching with the slave id of the given slave.
178 * when found, relink the open_link of the slave.
179 *
180 * call this with register_mutex down.
181 */
182 static void snd_timer_check_slave(snd_timer_instance_t *slave)
183 {
184 snd_timer_t *timer;
185 snd_timer_instance_t *master;
186 struct list_head *p, *q;
187
188 /* FIXME: it's really dumb to look up all entries.. */
189 list_for_each(p, &snd_timer_list) {
190 timer = list_entry(p, snd_timer_t, device_list);
191 list_for_each(q, &timer->open_list_head) {
192 master = list_entry(q, snd_timer_instance_t, open_list);
193 if (slave->slave_class == master->slave_class &&
194 slave->slave_id == master->slave_id) {
195 list_del(&slave->open_list);
196 list_add_tail(&slave->open_list,
197 &master->slave_list_head);
198 spin_lock_irq(&slave_active_lock);
199 slave->master = master;
200 slave->timer = master->timer;
201 spin_unlock_irq(&slave_active_lock);
202 return;
203 }
204 }
205 }
206 }
207
208 /*
209 * look for slave instances matching with the slave id of the given master.
210 * when found, relink the open_link of slaves.
211 *
212 * call this with register_mutex down.
213 */
214 static void snd_timer_check_master(snd_timer_instance_t *master)
215 {
216 snd_timer_instance_t *slave;
217 struct list_head *p, *n;
218
219 /* check all pending slaves */
220 list_for_each_safe(p, n, &snd_timer_slave_list) {
221 slave = list_entry(p, snd_timer_instance_t, open_list);
222 if (slave->slave_class == master->slave_class &&
223 slave->slave_id == master->slave_id) {
224 list_del(p);
225 list_add_tail(p, &master->slave_list_head);
226 spin_lock_irq(&slave_active_lock);
227 slave->master = master;
228 slave->timer = master->timer;
229 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
230 list_add_tail(&slave->active_list,
231 &master->slave_active_head);
232 spin_unlock_irq(&slave_active_lock);
233 }
234 }
235 }
236
237 /*
238 * open a timer instance
239 * when opening a master, the slave id must be here given.
240 */
241 int snd_timer_open(snd_timer_instance_t **ti,
242 char *owner, snd_timer_id_t *tid,
243 unsigned int slave_id)
244 {
245 snd_timer_t *timer;
246 snd_timer_instance_t *timeri = NULL;
247
248 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
249 /* open a slave instance */
250 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
251 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
252 snd_printd("invalid slave class %i\n", tid->dev_sclass);
253 return -EINVAL;
254 }
255 down(&register_mutex);
256 timeri = snd_timer_instance_new(owner, NULL);
257 if (!timeri) {
258 up(&register_mutex);
259 return -ENOMEM;
260 }
261 timeri->slave_class = tid->dev_sclass;
262 timeri->slave_id = tid->device;
263 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
264 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
265 snd_timer_check_slave(timeri);
266 up(&register_mutex);
267 *ti = timeri;
268 return 0;
269 }
270
271 /* open a master instance */
272 down(&register_mutex);
273 timer = snd_timer_find(tid);
274 #ifdef CONFIG_KMOD
275 if (timer == NULL) {
276 up(&register_mutex);
277 snd_timer_request(tid);
278 down(&register_mutex);
279 timer = snd_timer_find(tid);
280 }
281 #endif
282 if (!timer) {
283 up(&register_mutex);
284 return -ENODEV;
285 }
286 if (!list_empty(&timer->open_list_head)) {
287 timeri = list_entry(timer->open_list_head.next,
288 snd_timer_instance_t, open_list);
289 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
290 up(&register_mutex);
291 return -EBUSY;
292 }
293 }
294 timeri = snd_timer_instance_new(owner, timer);
295 if (!timeri) {
296 up(&register_mutex);
297 return -ENOMEM;
298 }
299 timeri->slave_class = tid->dev_sclass;
300 timeri->slave_id = slave_id;
301 if (list_empty(&timer->open_list_head) && timer->hw.open)
302 timer->hw.open(timer);
303 list_add_tail(&timeri->open_list, &timer->open_list_head);
304 snd_timer_check_master(timeri);
305 up(&register_mutex);
306 *ti = timeri;
307 return 0;
308 }
309
310 static int _snd_timer_stop(snd_timer_instance_t * timeri,
311 int keep_flag, enum sndrv_timer_event event);
312
313 /*
314 * close a timer instance
315 */
316 int snd_timer_close(snd_timer_instance_t * timeri)
317 {
318 snd_timer_t *timer = NULL;
319 struct list_head *p, *n;
320 snd_timer_instance_t *slave;
321
322 snd_assert(timeri != NULL, return -ENXIO);
323
324 /* force to stop the timer */
325 snd_timer_stop(timeri);
326
327 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
328 /* wait, until the active callback is finished */
329 spin_lock_irq(&slave_active_lock);
330 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
331 spin_unlock_irq(&slave_active_lock);
332 udelay(10);
333 spin_lock_irq(&slave_active_lock);
334 }
335 spin_unlock_irq(&slave_active_lock);
336 down(&register_mutex);
337 list_del(&timeri->open_list);
338 up(&register_mutex);
339 } else {
340 timer = timeri->timer;
341 /* wait, until the active callback is finished */
342 spin_lock_irq(&timer->lock);
343 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
344 spin_unlock_irq(&timer->lock);
345 udelay(10);
346 spin_lock_irq(&timer->lock);
347 }
348 spin_unlock_irq(&timer->lock);
349 down(&register_mutex);
350 list_del(&timeri->open_list);
351 if (timer && list_empty(&timer->open_list_head) &&
352 timer->hw.close)
353 timer->hw.close(timer);
354 /* remove slave links */
355 list_for_each_safe(p, n, &timeri->slave_list_head) {
356 slave = list_entry(p, snd_timer_instance_t, open_list);
357 spin_lock_irq(&slave_active_lock);
358 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
359 list_del(p);
360 list_add_tail(p, &snd_timer_slave_list);
361 slave->master = NULL;
362 slave->timer = NULL;
363 spin_unlock_irq(&slave_active_lock);
364 }
365 up(&register_mutex);
366 }
367 if (timeri->private_free)
368 timeri->private_free(timeri);
369 kfree(timeri->owner);
370 kfree(timeri);
371 if (timer)
372 module_put(timer->module);
373 return 0;
374 }
375
376 unsigned long snd_timer_resolution(snd_timer_instance_t * timeri)
377 {
378 snd_timer_t * timer;
379
380 if (timeri == NULL)
381 return 0;
382 if ((timer = timeri->timer) != NULL) {
383 if (timer->hw.c_resolution)
384 return timer->hw.c_resolution(timer);
385 return timer->hw.resolution;
386 }
387 return 0;
388 }
389
390 static void snd_timer_notify1(snd_timer_instance_t *ti,
391 enum sndrv_timer_event event)
392 {
393 snd_timer_t *timer;
394 unsigned long flags;
395 unsigned long resolution = 0;
396 snd_timer_instance_t *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, snd_timer_instance_t, 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(snd_timer_t *timer, snd_timer_instance_t *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(snd_timer_instance_t *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(snd_timer_instance_t * timeri, unsigned int ticks)
462 {
463 snd_timer_t *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(snd_timer_instance_t * timeri,
487 int keep_flag, enum sndrv_timer_event event)
488 {
489 snd_timer_t *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(snd_timer_instance_t * timeri)
536 {
537 snd_timer_t *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(snd_timer_instance_t * timeri)
556 {
557 snd_timer_t *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(snd_timer_instance_t * 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(snd_timer_t * timer, unsigned long ticks_left)
593 {
594 snd_timer_instance_t *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, snd_timer_instance_t, 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 snd_timer_t *timer = (snd_timer_t *) arg;
628 snd_timer_instance_t *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, snd_timer_instance_t, 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(snd_timer_t * timer, unsigned long ticks_left)
662 {
663 snd_timer_instance_t *ti, *ts;
664 unsigned long resolution, ticks;
665 struct list_head *p, *q, *n, *ack_list_head;
666 int use_tasklet = 0;
667
668 if (timer == NULL)
669 return;
670
671 spin_lock(&timer->lock);
672
673 /* remember the current resolution */
674 if (timer->hw.c_resolution)
675 resolution = timer->hw.c_resolution(timer);
676 else
677 resolution = timer->hw.resolution;
678
679 /* loop for all active instances
680 * Here we cannot use list_for_each because the active_list of a
681 * processed instance is relinked to done_list_head before the callback
682 * is called.
683 */
684 list_for_each_safe(p, n, &timer->active_list_head) {
685 ti = list_entry(p, snd_timer_instance_t, active_list);
686 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
687 continue;
688 ti->pticks += ticks_left;
689 ti->resolution = resolution;
690 if (ti->cticks < ticks_left)
691 ti->cticks = 0;
692 else
693 ti->cticks -= ticks_left;
694 if (ti->cticks) /* not expired */
695 continue;
696 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
697 ti->cticks = ti->ticks;
698 } else {
699 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
700 if (--timer->running)
701 list_del(p);
702 }
703 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
704 (ti->flags & SNDRV_TIMER_IFLG_FAST))
705 ack_list_head = &timer->ack_list_head;
706 else
707 ack_list_head = &timer->sack_list_head;
708 if (list_empty(&ti->ack_list))
709 list_add_tail(&ti->ack_list, ack_list_head);
710 list_for_each(q, &ti->slave_active_head) {
711 ts = list_entry(q, snd_timer_instance_t, active_list);
712 ts->pticks = ti->pticks;
713 ts->resolution = resolution;
714 if (list_empty(&ts->ack_list))
715 list_add_tail(&ts->ack_list, ack_list_head);
716 }
717 }
718 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
719 snd_timer_reschedule(timer, ticks_left);
720 if (timer->running) {
721 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
722 timer->hw.stop(timer);
723 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
724 }
725 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
726 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
727 /* restart timer */
728 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
729 timer->hw.start(timer);
730 }
731 } else {
732 timer->hw.stop(timer);
733 }
734
735 /* now process all fast callbacks */
736 while (!list_empty(&timer->ack_list_head)) {
737 p = timer->ack_list_head.next; /* get first item */
738 ti = list_entry(p, snd_timer_instance_t, ack_list);
739
740 /* remove from ack_list and make empty */
741 list_del_init(p);
742
743 ticks = ti->pticks;
744 ti->pticks = 0;
745
746 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
747 spin_unlock(&timer->lock);
748 if (ti->callback)
749 ti->callback(ti, resolution, ticks);
750 spin_lock(&timer->lock);
751 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
752 }
753
754 /* do we have any slow callbacks? */
755 use_tasklet = !list_empty(&timer->sack_list_head);
756 spin_unlock(&timer->lock);
757
758 if (use_tasklet)
759 tasklet_hi_schedule(&timer->task_queue);
760 }
761
762 /*
763
764 */
765
766 int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid,
767 snd_timer_t **rtimer)
768 {
769 snd_timer_t *timer;
770 int err;
771 static snd_device_ops_t ops = {
772 .dev_free = snd_timer_dev_free,
773 .dev_register = snd_timer_dev_register,
774 .dev_unregister = snd_timer_dev_unregister
775 };
776
777 snd_assert(tid != NULL, return -EINVAL);
778 snd_assert(rtimer != NULL, return -EINVAL);
779 *rtimer = NULL;
780 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
781 if (timer == NULL)
782 return -ENOMEM;
783 timer->tmr_class = tid->dev_class;
784 timer->card = card;
785 timer->tmr_device = tid->device;
786 timer->tmr_subdevice = tid->subdevice;
787 if (id)
788 strlcpy(timer->id, id, sizeof(timer->id));
789 INIT_LIST_HEAD(&timer->device_list);
790 INIT_LIST_HEAD(&timer->open_list_head);
791 INIT_LIST_HEAD(&timer->active_list_head);
792 INIT_LIST_HEAD(&timer->ack_list_head);
793 INIT_LIST_HEAD(&timer->sack_list_head);
794 spin_lock_init(&timer->lock);
795 tasklet_init(&timer->task_queue, snd_timer_tasklet,
796 (unsigned long)timer);
797 if (card != NULL) {
798 timer->module = card->module;
799 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
800 if (err < 0) {
801 snd_timer_free(timer);
802 return err;
803 }
804 }
805 *rtimer = timer;
806 return 0;
807 }
808
809 static int snd_timer_free(snd_timer_t *timer)
810 {
811 snd_assert(timer != NULL, return -ENXIO);
812 if (timer->private_free)
813 timer->private_free(timer);
814 kfree(timer);
815 return 0;
816 }
817
818 static int snd_timer_dev_free(snd_device_t *device)
819 {
820 snd_timer_t *timer = device->device_data;
821 return snd_timer_free(timer);
822 }
823
824 static int snd_timer_dev_register(snd_device_t *dev)
825 {
826 snd_timer_t *timer = dev->device_data;
827 snd_timer_t *timer1;
828 struct list_head *p;
829
830 snd_assert(timer != NULL && timer->hw.start != NULL &&
831 timer->hw.stop != NULL, return -ENXIO);
832 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
833 !timer->hw.resolution && timer->hw.c_resolution == NULL)
834 return -EINVAL;
835
836 down(&register_mutex);
837 list_for_each(p, &snd_timer_list) {
838 timer1 = list_entry(p, snd_timer_t, device_list);
839 if (timer1->tmr_class > timer->tmr_class)
840 break;
841 if (timer1->tmr_class < timer->tmr_class)
842 continue;
843 if (timer1->card && timer->card) {
844 if (timer1->card->number > timer->card->number)
845 break;
846 if (timer1->card->number < timer->card->number)
847 continue;
848 }
849 if (timer1->tmr_device > timer->tmr_device)
850 break;
851 if (timer1->tmr_device < timer->tmr_device)
852 continue;
853 if (timer1->tmr_subdevice > timer->tmr_subdevice)
854 break;
855 if (timer1->tmr_subdevice < timer->tmr_subdevice)
856 continue;
857 /* conflicts.. */
858 up(&register_mutex);
859 return -EBUSY;
860 }
861 list_add_tail(&timer->device_list, p);
862 up(&register_mutex);
863 return 0;
864 }
865
866 static int snd_timer_unregister(snd_timer_t *timer)
867 {
868 struct list_head *p, *n;
869 snd_timer_instance_t *ti;
870
871 snd_assert(timer != NULL, return -ENXIO);
872 down(&register_mutex);
873 if (! list_empty(&timer->open_list_head)) {
874 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer);
875 list_for_each_safe(p, n, &timer->open_list_head) {
876 list_del_init(p);
877 ti = list_entry(p, snd_timer_instance_t, open_list);
878 ti->timer = NULL;
879 }
880 }
881 list_del(&timer->device_list);
882 up(&register_mutex);
883 return snd_timer_free(timer);
884 }
885
886 static int snd_timer_dev_unregister(snd_device_t *device)
887 {
888 snd_timer_t *timer = device->device_data;
889 return snd_timer_unregister(timer);
890 }
891
892 void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event,
893 struct timespec *tstamp)
894 {
895 unsigned long flags;
896 unsigned long resolution = 0;
897 snd_timer_instance_t *ti, *ts;
898 struct list_head *p, *n;
899
900 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
901 return;
902 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART &&
903 event <= SNDRV_TIMER_EVENT_MRESUME, return);
904 spin_lock_irqsave(&timer->lock, flags);
905 if (event == SNDRV_TIMER_EVENT_MSTART ||
906 event == SNDRV_TIMER_EVENT_MCONTINUE ||
907 event == SNDRV_TIMER_EVENT_MRESUME) {
908 if (timer->hw.c_resolution)
909 resolution = timer->hw.c_resolution(timer);
910 else
911 resolution = timer->hw.resolution;
912 }
913 list_for_each(p, &timer->active_list_head) {
914 ti = list_entry(p, snd_timer_instance_t, active_list);
915 if (ti->ccallback)
916 ti->ccallback(ti, event, tstamp, resolution);
917 list_for_each(n, &ti->slave_active_head) {
918 ts = list_entry(n, snd_timer_instance_t, active_list);
919 if (ts->ccallback)
920 ts->ccallback(ts, event, tstamp, resolution);
921 }
922 }
923 spin_unlock_irqrestore(&timer->lock, flags);
924 }
925
926 /*
927 * exported functions for global timers
928 */
929 int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer)
930 {
931 snd_timer_id_t tid;
932
933 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
934 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
935 tid.card = -1;
936 tid.device = device;
937 tid.subdevice = 0;
938 return snd_timer_new(NULL, id, &tid, rtimer);
939 }
940
941 int snd_timer_global_free(snd_timer_t *timer)
942 {
943 return snd_timer_free(timer);
944 }
945
946 int snd_timer_global_register(snd_timer_t *timer)
947 {
948 snd_device_t dev;
949
950 memset(&dev, 0, sizeof(dev));
951 dev.device_data = timer;
952 return snd_timer_dev_register(&dev);
953 }
954
955 int snd_timer_global_unregister(snd_timer_t *timer)
956 {
957 return snd_timer_unregister(timer);
958 }
959
960 /*
961 * System timer
962 */
963
964 struct snd_timer_system_private {
965 struct timer_list tlist;
966 struct timer * timer;
967 unsigned long last_expires;
968 unsigned long last_jiffies;
969 unsigned long correction;
970 };
971
972 static void snd_timer_s_function(unsigned long data)
973 {
974 snd_timer_t *timer = (snd_timer_t *)data;
975 struct snd_timer_system_private *priv = timer->private_data;
976 unsigned long jiff = jiffies;
977 if (time_after(jiff, priv->last_expires))
978 priv->correction = (long)jiff - (long)priv->last_expires;
979 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
980 }
981
982 static int snd_timer_s_start(snd_timer_t * timer)
983 {
984 struct snd_timer_system_private *priv;
985 unsigned long njiff;
986
987 priv = (struct snd_timer_system_private *) timer->private_data;
988 njiff = (priv->last_jiffies = jiffies);
989 if (priv->correction > timer->sticks - 1) {
990 priv->correction -= timer->sticks - 1;
991 njiff++;
992 } else {
993 njiff += timer->sticks - priv->correction;
994 priv->correction -= timer->sticks;
995 }
996 priv->last_expires = priv->tlist.expires = njiff;
997 add_timer(&priv->tlist);
998 return 0;
999 }
1000
1001 static int snd_timer_s_stop(snd_timer_t * timer)
1002 {
1003 struct snd_timer_system_private *priv;
1004 unsigned long jiff;
1005
1006 priv = (struct snd_timer_system_private *) timer->private_data;
1007 del_timer(&priv->tlist);
1008 jiff = jiffies;
1009 if (time_before(jiff, priv->last_expires))
1010 timer->sticks = priv->last_expires - jiff;
1011 else
1012 timer->sticks = 1;
1013 return 0;
1014 }
1015
1016 static struct _snd_timer_hardware snd_timer_system =
1017 {
1018 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1019 .resolution = 1000000000L / HZ,
1020 .ticks = 10000000L,
1021 .start = snd_timer_s_start,
1022 .stop = snd_timer_s_stop
1023 };
1024
1025 static void snd_timer_free_system(snd_timer_t *timer)
1026 {
1027 kfree(timer->private_data);
1028 }
1029
1030 static int snd_timer_register_system(void)
1031 {
1032 snd_timer_t *timer;
1033 struct snd_timer_system_private *priv;
1034 int err;
1035
1036 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1037 if (err < 0)
1038 return err;
1039 strcpy(timer->name, "system timer");
1040 timer->hw = snd_timer_system;
1041 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1042 if (priv == NULL) {
1043 snd_timer_free(timer);
1044 return -ENOMEM;
1045 }
1046 init_timer(&priv->tlist);
1047 priv->tlist.function = snd_timer_s_function;
1048 priv->tlist.data = (unsigned long) timer;
1049 timer->private_data = priv;
1050 timer->private_free = snd_timer_free_system;
1051 return snd_timer_global_register(timer);
1052 }
1053
1054 /*
1055 * Info interface
1056 */
1057
1058 static void snd_timer_proc_read(snd_info_entry_t *entry,
1059 snd_info_buffer_t * buffer)
1060 {
1061 unsigned long flags;
1062 snd_timer_t *timer;
1063 snd_timer_instance_t *ti;
1064 struct list_head *p, *q;
1065
1066 down(&register_mutex);
1067 list_for_each(p, &snd_timer_list) {
1068 timer = list_entry(p, snd_timer_t, device_list);
1069 switch (timer->tmr_class) {
1070 case SNDRV_TIMER_CLASS_GLOBAL:
1071 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1072 break;
1073 case SNDRV_TIMER_CLASS_CARD:
1074 snd_iprintf(buffer, "C%i-%i: ",
1075 timer->card->number, timer->tmr_device);
1076 break;
1077 case SNDRV_TIMER_CLASS_PCM:
1078 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1079 timer->tmr_device, timer->tmr_subdevice);
1080 break;
1081 default:
1082 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1083 timer->card ? timer->card->number : -1,
1084 timer->tmr_device, timer->tmr_subdevice);
1085 }
1086 snd_iprintf(buffer, "%s :", timer->name);
1087 if (timer->hw.resolution)
1088 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1089 timer->hw.resolution / 1000,
1090 timer->hw.resolution % 1000,
1091 timer->hw.ticks);
1092 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1093 snd_iprintf(buffer, " SLAVE");
1094 snd_iprintf(buffer, "\n");
1095 spin_lock_irqsave(&timer->lock, flags);
1096 list_for_each(q, &timer->open_list_head) {
1097 ti = list_entry(q, snd_timer_instance_t, open_list);
1098 snd_iprintf(buffer, " Client %s : %s\n",
1099 ti->owner ? ti->owner : "unknown",
1100 ti->flags & (SNDRV_TIMER_IFLG_START |
1101 SNDRV_TIMER_IFLG_RUNNING)
1102 ? "running" : "stopped");
1103 }
1104 spin_unlock_irqrestore(&timer->lock, flags);
1105 }
1106 up(&register_mutex);
1107 }
1108
1109 /*
1110 * USER SPACE interface
1111 */
1112
1113 static void snd_timer_user_interrupt(snd_timer_instance_t *timeri,
1114 unsigned long resolution,
1115 unsigned long ticks)
1116 {
1117 snd_timer_user_t *tu = timeri->callback_data;
1118 snd_timer_read_t *r;
1119 int prev;
1120
1121 spin_lock(&tu->qlock);
1122 if (tu->qused > 0) {
1123 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1124 r = &tu->queue[prev];
1125 if (r->resolution == resolution) {
1126 r->ticks += ticks;
1127 goto __wake;
1128 }
1129 }
1130 if (tu->qused >= tu->queue_size) {
1131 tu->overrun++;
1132 } else {
1133 r = &tu->queue[tu->qtail++];
1134 tu->qtail %= tu->queue_size;
1135 r->resolution = resolution;
1136 r->ticks = ticks;
1137 tu->qused++;
1138 }
1139 __wake:
1140 spin_unlock(&tu->qlock);
1141 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1142 wake_up(&tu->qchange_sleep);
1143 }
1144
1145 static void snd_timer_user_append_to_tqueue(snd_timer_user_t *tu,
1146 snd_timer_tread_t *tread)
1147 {
1148 if (tu->qused >= tu->queue_size) {
1149 tu->overrun++;
1150 } else {
1151 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1152 tu->qtail %= tu->queue_size;
1153 tu->qused++;
1154 }
1155 }
1156
1157 static void snd_timer_user_ccallback(snd_timer_instance_t *timeri,
1158 enum sndrv_timer_event event,
1159 struct timespec *tstamp,
1160 unsigned long resolution)
1161 {
1162 snd_timer_user_t *tu = timeri->callback_data;
1163 snd_timer_tread_t r1;
1164
1165 if (event >= SNDRV_TIMER_EVENT_START &&
1166 event <= SNDRV_TIMER_EVENT_PAUSE)
1167 tu->tstamp = *tstamp;
1168 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1169 return;
1170 r1.event = event;
1171 r1.tstamp = *tstamp;
1172 r1.val = resolution;
1173 spin_lock(&tu->qlock);
1174 snd_timer_user_append_to_tqueue(tu, &r1);
1175 spin_unlock(&tu->qlock);
1176 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1177 wake_up(&tu->qchange_sleep);
1178 }
1179
1180 static void snd_timer_user_tinterrupt(snd_timer_instance_t *timeri,
1181 unsigned long resolution,
1182 unsigned long ticks)
1183 {
1184 snd_timer_user_t *tu = timeri->callback_data;
1185 snd_timer_tread_t *r, r1;
1186 struct timespec tstamp;
1187 int prev, append = 0;
1188
1189 memset(&tstamp, 0, sizeof(tstamp));
1190 spin_lock(&tu->qlock);
1191 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1192 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1193 spin_unlock(&tu->qlock);
1194 return;
1195 }
1196 if (tu->last_resolution != resolution || ticks > 0)
1197 getnstimeofday(&tstamp);
1198 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1199 tu->last_resolution != resolution) {
1200 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1201 r1.tstamp = tstamp;
1202 r1.val = resolution;
1203 snd_timer_user_append_to_tqueue(tu, &r1);
1204 tu->last_resolution = resolution;
1205 append++;
1206 }
1207 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1208 goto __wake;
1209 if (ticks == 0)
1210 goto __wake;
1211 if (tu->qused > 0) {
1212 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1213 r = &tu->tqueue[prev];
1214 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1215 r->tstamp = tstamp;
1216 r->val += ticks;
1217 append++;
1218 goto __wake;
1219 }
1220 }
1221 r1.event = SNDRV_TIMER_EVENT_TICK;
1222 r1.tstamp = tstamp;
1223 r1.val = ticks;
1224 snd_timer_user_append_to_tqueue(tu, &r1);
1225 append++;
1226 __wake:
1227 spin_unlock(&tu->qlock);
1228 if (append == 0)
1229 return;
1230 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1231 wake_up(&tu->qchange_sleep);
1232 }
1233
1234 static int snd_timer_user_open(struct inode *inode, struct file *file)
1235 {
1236 snd_timer_user_t *tu;
1237
1238 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1239 if (tu == NULL)
1240 return -ENOMEM;
1241 spin_lock_init(&tu->qlock);
1242 init_waitqueue_head(&tu->qchange_sleep);
1243 init_MUTEX(&tu->tread_sem);
1244 tu->ticks = 1;
1245 tu->queue_size = 128;
1246 tu->queue = kmalloc(tu->queue_size * sizeof(snd_timer_read_t),
1247 GFP_KERNEL);
1248 if (tu->queue == NULL) {
1249 kfree(tu);
1250 return -ENOMEM;
1251 }
1252 file->private_data = tu;
1253 return 0;
1254 }
1255
1256 static int snd_timer_user_release(struct inode *inode, struct file *file)
1257 {
1258 snd_timer_user_t *tu;
1259
1260 if (file->private_data) {
1261 tu = file->private_data;
1262 file->private_data = NULL;
1263 fasync_helper(-1, file, 0, &tu->fasync);
1264 if (tu->timeri)
1265 snd_timer_close(tu->timeri);
1266 kfree(tu->queue);
1267 kfree(tu->tqueue);
1268 kfree(tu);
1269 }
1270 return 0;
1271 }
1272
1273 static void snd_timer_user_zero_id(snd_timer_id_t *id)
1274 {
1275 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1276 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1277 id->card = -1;
1278 id->device = -1;
1279 id->subdevice = -1;
1280 }
1281
1282 static void snd_timer_user_copy_id(snd_timer_id_t *id, snd_timer_t *timer)
1283 {
1284 id->dev_class = timer->tmr_class;
1285 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1286 id->card = timer->card ? timer->card->number : -1;
1287 id->device = timer->tmr_device;
1288 id->subdevice = timer->tmr_subdevice;
1289 }
1290
1291 static int snd_timer_user_next_device(snd_timer_id_t __user *_tid)
1292 {
1293 snd_timer_id_t id;
1294 snd_timer_t *timer;
1295 struct list_head *p;
1296
1297 if (copy_from_user(&id, _tid, sizeof(id)))
1298 return -EFAULT;
1299 down(&register_mutex);
1300 if (id.dev_class < 0) { /* first item */
1301 if (list_empty(&snd_timer_list))
1302 snd_timer_user_zero_id(&id);
1303 else {
1304 timer = list_entry(snd_timer_list.next,
1305 snd_timer_t, device_list);
1306 snd_timer_user_copy_id(&id, timer);
1307 }
1308 } else {
1309 switch (id.dev_class) {
1310 case SNDRV_TIMER_CLASS_GLOBAL:
1311 id.device = id.device < 0 ? 0 : id.device + 1;
1312 list_for_each(p, &snd_timer_list) {
1313 timer = list_entry(p, snd_timer_t, device_list);
1314 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1315 snd_timer_user_copy_id(&id, timer);
1316 break;
1317 }
1318 if (timer->tmr_device >= id.device) {
1319 snd_timer_user_copy_id(&id, timer);
1320 break;
1321 }
1322 }
1323 if (p == &snd_timer_list)
1324 snd_timer_user_zero_id(&id);
1325 break;
1326 case SNDRV_TIMER_CLASS_CARD:
1327 case SNDRV_TIMER_CLASS_PCM:
1328 if (id.card < 0) {
1329 id.card = 0;
1330 } else {
1331 if (id.card < 0) {
1332 id.card = 0;
1333 } else {
1334 if (id.device < 0) {
1335 id.device = 0;
1336 } else {
1337 if (id.subdevice < 0) {
1338 id.subdevice = 0;
1339 } else {
1340 id.subdevice++;
1341 }
1342 }
1343 }
1344 }
1345 list_for_each(p, &snd_timer_list) {
1346 timer = list_entry(p, snd_timer_t, device_list);
1347 if (timer->tmr_class > id.dev_class) {
1348 snd_timer_user_copy_id(&id, timer);
1349 break;
1350 }
1351 if (timer->tmr_class < id.dev_class)
1352 continue;
1353 if (timer->card->number > id.card) {
1354 snd_timer_user_copy_id(&id, timer);
1355 break;
1356 }
1357 if (timer->card->number < id.card)
1358 continue;
1359 if (timer->tmr_device > id.device) {
1360 snd_timer_user_copy_id(&id, timer);
1361 break;
1362 }
1363 if (timer->tmr_device < id.device)
1364 continue;
1365 if (timer->tmr_subdevice > id.subdevice) {
1366 snd_timer_user_copy_id(&id, timer);
1367 break;
1368 }
1369 if (timer->tmr_subdevice < id.subdevice)
1370 continue;
1371 snd_timer_user_copy_id(&id, timer);
1372 break;
1373 }
1374 if (p == &snd_timer_list)
1375 snd_timer_user_zero_id(&id);
1376 break;
1377 default:
1378 snd_timer_user_zero_id(&id);
1379 }
1380 }
1381 up(&register_mutex);
1382 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1383 return -EFAULT;
1384 return 0;
1385 }
1386
1387 static int snd_timer_user_ginfo(struct file *file,
1388 snd_timer_ginfo_t __user *_ginfo)
1389 {
1390 snd_timer_ginfo_t *ginfo;
1391 snd_timer_id_t tid;
1392 snd_timer_t *t;
1393 struct list_head *p;
1394 int err = 0;
1395
1396 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1397 if (! ginfo)
1398 return -ENOMEM;
1399 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1400 kfree(ginfo);
1401 return -EFAULT;
1402 }
1403 tid = ginfo->tid;
1404 memset(ginfo, 0, sizeof(*ginfo));
1405 ginfo->tid = tid;
1406 down(&register_mutex);
1407 t = snd_timer_find(&tid);
1408 if (t != NULL) {
1409 ginfo->card = t->card ? t->card->number : -1;
1410 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1411 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1412 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1413 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1414 ginfo->resolution = t->hw.resolution;
1415 if (t->hw.resolution_min > 0) {
1416 ginfo->resolution_min = t->hw.resolution_min;
1417 ginfo->resolution_max = t->hw.resolution_max;
1418 }
1419 list_for_each(p, &t->open_list_head) {
1420 ginfo->clients++;
1421 }
1422 } else {
1423 err = -ENODEV;
1424 }
1425 up(&register_mutex);
1426 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1427 err = -EFAULT;
1428 kfree(ginfo);
1429 return err;
1430 }
1431
1432 static int snd_timer_user_gparams(struct file *file,
1433 snd_timer_gparams_t __user *_gparams)
1434 {
1435 snd_timer_gparams_t gparams;
1436 snd_timer_t *t;
1437 int err;
1438
1439 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1440 return -EFAULT;
1441 down(&register_mutex);
1442 t = snd_timer_find(&gparams.tid);
1443 if (!t) {
1444 err = -ENODEV;
1445 goto _error;
1446 }
1447 if (!list_empty(&t->open_list_head)) {
1448 err = -EBUSY;
1449 goto _error;
1450 }
1451 if (!t->hw.set_period) {
1452 err = -ENOSYS;
1453 goto _error;
1454 }
1455 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1456 _error:
1457 up(&register_mutex);
1458 return err;
1459 }
1460
1461 static int snd_timer_user_gstatus(struct file *file,
1462 snd_timer_gstatus_t __user *_gstatus)
1463 {
1464 snd_timer_gstatus_t gstatus;
1465 snd_timer_id_t tid;
1466 snd_timer_t *t;
1467 int err = 0;
1468
1469 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1470 return -EFAULT;
1471 tid = gstatus.tid;
1472 memset(&gstatus, 0, sizeof(gstatus));
1473 gstatus.tid = tid;
1474 down(&register_mutex);
1475 t = snd_timer_find(&tid);
1476 if (t != NULL) {
1477 if (t->hw.c_resolution)
1478 gstatus.resolution = t->hw.c_resolution(t);
1479 else
1480 gstatus.resolution = t->hw.resolution;
1481 if (t->hw.precise_resolution) {
1482 t->hw.precise_resolution(t, &gstatus.resolution_num,
1483 &gstatus.resolution_den);
1484 } else {
1485 gstatus.resolution_num = gstatus.resolution;
1486 gstatus.resolution_den = 1000000000uL;
1487 }
1488 } else {
1489 err = -ENODEV;
1490 }
1491 up(&register_mutex);
1492 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1493 err = -EFAULT;
1494 return err;
1495 }
1496
1497 static int snd_timer_user_tselect(struct file *file,
1498 snd_timer_select_t __user *_tselect)
1499 {
1500 snd_timer_user_t *tu;
1501 snd_timer_select_t tselect;
1502 char str[32];
1503 int err = 0;
1504
1505 tu = file->private_data;
1506 down(&tu->tread_sem);
1507 if (tu->timeri) {
1508 snd_timer_close(tu->timeri);
1509 tu->timeri = NULL;
1510 }
1511 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1512 err = -EFAULT;
1513 goto __err;
1514 }
1515 sprintf(str, "application %i", current->pid);
1516 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1517 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1518 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1519 if (err < 0)
1520 goto __err;
1521
1522 kfree(tu->queue);
1523 tu->queue = NULL;
1524 kfree(tu->tqueue);
1525 tu->tqueue = NULL;
1526 if (tu->tread) {
1527 tu->tqueue = kmalloc(tu->queue_size * sizeof(snd_timer_tread_t),
1528 GFP_KERNEL);
1529 if (tu->tqueue == NULL)
1530 err = -ENOMEM;
1531 } else {
1532 tu->queue = kmalloc(tu->queue_size * sizeof(snd_timer_read_t),
1533 GFP_KERNEL);
1534 if (tu->queue == NULL)
1535 err = -ENOMEM;
1536 }
1537
1538 if (err < 0) {
1539 snd_timer_close(tu->timeri);
1540 tu->timeri = NULL;
1541 } else {
1542 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1543 tu->timeri->callback = tu->tread
1544 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1545 tu->timeri->ccallback = snd_timer_user_ccallback;
1546 tu->timeri->callback_data = (void *)tu;
1547 }
1548
1549 __err:
1550 up(&tu->tread_sem);
1551 return err;
1552 }
1553
1554 static int snd_timer_user_info(struct file *file,
1555 snd_timer_info_t __user *_info)
1556 {
1557 snd_timer_user_t *tu;
1558 snd_timer_info_t *info;
1559 snd_timer_t *t;
1560 int err = 0;
1561
1562 tu = file->private_data;
1563 snd_assert(tu->timeri != NULL, return -ENXIO);
1564 t = tu->timeri->timer;
1565 snd_assert(t != NULL, return -ENXIO);
1566
1567 info = kzalloc(sizeof(*info), GFP_KERNEL);
1568 if (! info)
1569 return -ENOMEM;
1570 info->card = t->card ? t->card->number : -1;
1571 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1572 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1573 strlcpy(info->id, t->id, sizeof(info->id));
1574 strlcpy(info->name, t->name, sizeof(info->name));
1575 info->resolution = t->hw.resolution;
1576 if (copy_to_user(_info, info, sizeof(*_info)))
1577 err = -EFAULT;
1578 kfree(info);
1579 return err;
1580 }
1581
1582 static int snd_timer_user_params(struct file *file,
1583 snd_timer_params_t __user *_params)
1584 {
1585 snd_timer_user_t *tu;
1586 snd_timer_params_t params;
1587 snd_timer_t *t;
1588 snd_timer_read_t *tr;
1589 snd_timer_tread_t *ttr;
1590 int err;
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 if (copy_from_user(&params, _params, sizeof(params)))
1597 return -EFAULT;
1598 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1599 err = -EINVAL;
1600 goto _end;
1601 }
1602 if (params.queue_size > 0 &&
1603 (params.queue_size < 32 || params.queue_size > 1024)) {
1604 err = -EINVAL;
1605 goto _end;
1606 }
1607 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1608 (1<<SNDRV_TIMER_EVENT_TICK)|
1609 (1<<SNDRV_TIMER_EVENT_START)|
1610 (1<<SNDRV_TIMER_EVENT_STOP)|
1611 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1612 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1613 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1614 (1<<SNDRV_TIMER_EVENT_RESUME)|
1615 (1<<SNDRV_TIMER_EVENT_MSTART)|
1616 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1617 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1618 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1619 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1620 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1621 err = -EINVAL;
1622 goto _end;
1623 }
1624 snd_timer_stop(tu->timeri);
1625 spin_lock_irq(&t->lock);
1626 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1627 SNDRV_TIMER_IFLG_EXCLUSIVE|
1628 SNDRV_TIMER_IFLG_EARLY_EVENT);
1629 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1630 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1631 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1632 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1633 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1634 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1635 spin_unlock_irq(&t->lock);
1636 if (params.queue_size > 0 &&
1637 (unsigned int)tu->queue_size != params.queue_size) {
1638 if (tu->tread) {
1639 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1640 GFP_KERNEL);
1641 if (ttr) {
1642 kfree(tu->tqueue);
1643 tu->queue_size = params.queue_size;
1644 tu->tqueue = ttr;
1645 }
1646 } else {
1647 tr = kmalloc(params.queue_size * sizeof(*tr),
1648 GFP_KERNEL);
1649 if (tr) {
1650 kfree(tu->queue);
1651 tu->queue_size = params.queue_size;
1652 tu->queue = tr;
1653 }
1654 }
1655 }
1656 tu->qhead = tu->qtail = tu->qused = 0;
1657 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1658 if (tu->tread) {
1659 snd_timer_tread_t tread;
1660 tread.event = SNDRV_TIMER_EVENT_EARLY;
1661 tread.tstamp.tv_sec = 0;
1662 tread.tstamp.tv_nsec = 0;
1663 tread.val = 0;
1664 snd_timer_user_append_to_tqueue(tu, &tread);
1665 } else {
1666 snd_timer_read_t *r = &tu->queue[0];
1667 r->resolution = 0;
1668 r->ticks = 0;
1669 tu->qused++;
1670 tu->qtail++;
1671 }
1672 }
1673 tu->filter = params.filter;
1674 tu->ticks = params.ticks;
1675 err = 0;
1676 _end:
1677 if (copy_to_user(_params, &params, sizeof(params)))
1678 return -EFAULT;
1679 return err;
1680 }
1681
1682 static int snd_timer_user_status(struct file *file,
1683 snd_timer_status_t __user *_status)
1684 {
1685 snd_timer_user_t *tu;
1686 snd_timer_status_t status;
1687
1688 tu = file->private_data;
1689 snd_assert(tu->timeri != NULL, return -ENXIO);
1690 memset(&status, 0, sizeof(status));
1691 status.tstamp = tu->tstamp;
1692 status.resolution = snd_timer_resolution(tu->timeri);
1693 status.lost = tu->timeri->lost;
1694 status.overrun = tu->overrun;
1695 spin_lock_irq(&tu->qlock);
1696 status.queue = tu->qused;
1697 spin_unlock_irq(&tu->qlock);
1698 if (copy_to_user(_status, &status, sizeof(status)))
1699 return -EFAULT;
1700 return 0;
1701 }
1702
1703 static int snd_timer_user_start(struct file *file)
1704 {
1705 int err;
1706 snd_timer_user_t *tu;
1707
1708 tu = file->private_data;
1709 snd_assert(tu->timeri != NULL, return -ENXIO);
1710 snd_timer_stop(tu->timeri);
1711 tu->timeri->lost = 0;
1712 tu->last_resolution = 0;
1713 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1714 }
1715
1716 static int snd_timer_user_stop(struct file *file)
1717 {
1718 int err;
1719 snd_timer_user_t *tu;
1720
1721 tu = file->private_data;
1722 snd_assert(tu->timeri != NULL, return -ENXIO);
1723 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1724 }
1725
1726 static int snd_timer_user_continue(struct file *file)
1727 {
1728 int err;
1729 snd_timer_user_t *tu;
1730
1731 tu = file->private_data;
1732 snd_assert(tu->timeri != NULL, return -ENXIO);
1733 tu->timeri->lost = 0;
1734 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1735 }
1736
1737 static int snd_timer_user_pause(struct file *file)
1738 {
1739 int err;
1740 snd_timer_user_t *tu;
1741
1742 tu = file->private_data;
1743 snd_assert(tu->timeri != NULL, return -ENXIO);
1744 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1745 }
1746
1747 enum {
1748 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1749 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1750 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1751 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1752 };
1753
1754 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1755 unsigned long arg)
1756 {
1757 snd_timer_user_t *tu;
1758 void __user *argp = (void __user *)arg;
1759 int __user *p = argp;
1760
1761 tu = file->private_data;
1762 switch (cmd) {
1763 case SNDRV_TIMER_IOCTL_PVERSION:
1764 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1765 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1766 return snd_timer_user_next_device(argp);
1767 case SNDRV_TIMER_IOCTL_TREAD:
1768 {
1769 int xarg;
1770
1771 down(&tu->tread_sem);
1772 if (tu->timeri) { /* too late */
1773 up(&tu->tread_sem);
1774 return -EBUSY;
1775 }
1776 if (get_user(xarg, p)) {
1777 up(&tu->tread_sem);
1778 return -EFAULT;
1779 }
1780 tu->tread = xarg ? 1 : 0;
1781 up(&tu->tread_sem);
1782 return 0;
1783 }
1784 case SNDRV_TIMER_IOCTL_GINFO:
1785 return snd_timer_user_ginfo(file, argp);
1786 case SNDRV_TIMER_IOCTL_GPARAMS:
1787 return snd_timer_user_gparams(file, argp);
1788 case SNDRV_TIMER_IOCTL_GSTATUS:
1789 return snd_timer_user_gstatus(file, argp);
1790 case SNDRV_TIMER_IOCTL_SELECT:
1791 return snd_timer_user_tselect(file, argp);
1792 case SNDRV_TIMER_IOCTL_INFO:
1793 return snd_timer_user_info(file, argp);
1794 case SNDRV_TIMER_IOCTL_PARAMS:
1795 return snd_timer_user_params(file, argp);
1796 case SNDRV_TIMER_IOCTL_STATUS:
1797 return snd_timer_user_status(file, argp);
1798 case SNDRV_TIMER_IOCTL_START:
1799 case SNDRV_TIMER_IOCTL_START_OLD:
1800 return snd_timer_user_start(file);
1801 case SNDRV_TIMER_IOCTL_STOP:
1802 case SNDRV_TIMER_IOCTL_STOP_OLD:
1803 return snd_timer_user_stop(file);
1804 case SNDRV_TIMER_IOCTL_CONTINUE:
1805 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1806 return snd_timer_user_continue(file);
1807 case SNDRV_TIMER_IOCTL_PAUSE:
1808 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1809 return snd_timer_user_pause(file);
1810 }
1811 return -ENOTTY;
1812 }
1813
1814 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1815 {
1816 snd_timer_user_t *tu;
1817 int err;
1818
1819 tu = file->private_data;
1820 err = fasync_helper(fd, file, on, &tu->fasync);
1821 if (err < 0)
1822 return err;
1823 return 0;
1824 }
1825
1826 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1827 size_t count, loff_t *offset)
1828 {
1829 snd_timer_user_t *tu;
1830 long result = 0, unit;
1831 int err = 0;
1832
1833 tu = file->private_data;
1834 unit = tu->tread ? sizeof(snd_timer_tread_t) : sizeof(snd_timer_read_t);
1835 spin_lock_irq(&tu->qlock);
1836 while ((long)count - result >= unit) {
1837 while (!tu->qused) {
1838 wait_queue_t wait;
1839
1840 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1841 err = -EAGAIN;
1842 break;
1843 }
1844
1845 set_current_state(TASK_INTERRUPTIBLE);
1846 init_waitqueue_entry(&wait, current);
1847 add_wait_queue(&tu->qchange_sleep, &wait);
1848
1849 spin_unlock_irq(&tu->qlock);
1850 schedule();
1851 spin_lock_irq(&tu->qlock);
1852
1853 remove_wait_queue(&tu->qchange_sleep, &wait);
1854
1855 if (signal_pending(current)) {
1856 err = -ERESTARTSYS;
1857 break;
1858 }
1859 }
1860
1861 spin_unlock_irq(&tu->qlock);
1862 if (err < 0)
1863 goto _error;
1864
1865 if (tu->tread) {
1866 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1867 sizeof(snd_timer_tread_t))) {
1868 err = -EFAULT;
1869 goto _error;
1870 }
1871 } else {
1872 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1873 sizeof(snd_timer_read_t))) {
1874 err = -EFAULT;
1875 goto _error;
1876 }
1877 }
1878
1879 tu->qhead %= tu->queue_size;
1880
1881 result += unit;
1882 buffer += unit;
1883
1884 spin_lock_irq(&tu->qlock);
1885 tu->qused--;
1886 }
1887 spin_unlock_irq(&tu->qlock);
1888 _error:
1889 return result > 0 ? result : err;
1890 }
1891
1892 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1893 {
1894 unsigned int mask;
1895 snd_timer_user_t *tu;
1896
1897 tu = file->private_data;
1898
1899 poll_wait(file, &tu->qchange_sleep, wait);
1900
1901 mask = 0;
1902 if (tu->qused)
1903 mask |= POLLIN | POLLRDNORM;
1904
1905 return mask;
1906 }
1907
1908 #ifdef CONFIG_COMPAT
1909 #include "timer_compat.c"
1910 #else
1911 #define snd_timer_user_ioctl_compat NULL
1912 #endif
1913
1914 static struct file_operations snd_timer_f_ops =
1915 {
1916 .owner = THIS_MODULE,
1917 .read = snd_timer_user_read,
1918 .open = snd_timer_user_open,
1919 .release = snd_timer_user_release,
1920 .poll = snd_timer_user_poll,
1921 .unlocked_ioctl = snd_timer_user_ioctl,
1922 .compat_ioctl = snd_timer_user_ioctl_compat,
1923 .fasync = snd_timer_user_fasync,
1924 };
1925
1926 static snd_minor_t snd_timer_reg =
1927 {
1928 .comment = "timer",
1929 .f_ops = &snd_timer_f_ops,
1930 };
1931
1932 /*
1933 * ENTRY functions
1934 */
1935
1936 static snd_info_entry_t *snd_timer_proc_entry = NULL;
1937
1938 static int __init alsa_timer_init(void)
1939 {
1940 int err;
1941 snd_info_entry_t *entry;
1942
1943 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1944 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1945 "system timer");
1946 #endif
1947 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1948 if (entry != NULL) {
1949 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128;
1950 entry->c.text.read = snd_timer_proc_read;
1951 if (snd_info_register(entry) < 0) {
1952 snd_info_free_entry(entry);
1953 entry = NULL;
1954 }
1955 }
1956 snd_timer_proc_entry = entry;
1957 if ((err = snd_timer_register_system()) < 0)
1958 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1959 err);
1960 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER,
1961 NULL, 0, &snd_timer_reg, "timer"))<0)
1962 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1963 err);
1964 return 0;
1965 }
1966
1967 static void __exit alsa_timer_exit(void)
1968 {
1969 struct list_head *p, *n;
1970
1971 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1972 /* unregister the system timer */
1973 list_for_each_safe(p, n, &snd_timer_list) {
1974 snd_timer_t *timer = list_entry(p, snd_timer_t, device_list);
1975 snd_timer_unregister(timer);
1976 }
1977 if (snd_timer_proc_entry) {
1978 snd_info_unregister(snd_timer_proc_entry);
1979 snd_timer_proc_entry = NULL;
1980 }
1981 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1982 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1983 #endif
1984 }
1985
1986 module_init(alsa_timer_init)
1987 module_exit(alsa_timer_exit)
1988
1989 EXPORT_SYMBOL(snd_timer_open);
1990 EXPORT_SYMBOL(snd_timer_close);
1991 EXPORT_SYMBOL(snd_timer_resolution);
1992 EXPORT_SYMBOL(snd_timer_start);
1993 EXPORT_SYMBOL(snd_timer_stop);
1994 EXPORT_SYMBOL(snd_timer_continue);
1995 EXPORT_SYMBOL(snd_timer_pause);
1996 EXPORT_SYMBOL(snd_timer_new);
1997 EXPORT_SYMBOL(snd_timer_notify);
1998 EXPORT_SYMBOL(snd_timer_global_new);
1999 EXPORT_SYMBOL(snd_timer_global_free);
2000 EXPORT_SYMBOL(snd_timer_global_register);
2001 EXPORT_SYMBOL(snd_timer_global_unregister);
2002 EXPORT_SYMBOL(snd_timer_interrupt);
linux v2.6.22.y-op