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[ALSA] dynamic minors (1/6): store device type in struct snd_minor
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / sound / core / timer.c
bloba7bcb04263cba2fd3c79d1dc5dc47b215205b72c
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 struct snd_timer_user {
57 struct snd_timer_instance *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 struct snd_timer_read *queue;
66 struct snd_timer_tread *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 };
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(struct snd_timer *timer);
88 static int snd_timer_dev_free(struct snd_device *device);
89 static int snd_timer_dev_register(struct snd_device *device);
90 static int snd_timer_dev_unregister(struct snd_device *device);
91
92 static void snd_timer_reschedule(struct snd_timer * 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 struct snd_timer_instance *snd_timer_instance_new(char *owner,
99 struct snd_timer *timer)
100 {
101 struct snd_timer_instance *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 struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
130 {
131 struct snd_timer *timer = NULL;
132 struct list_head *p;
133
134 list_for_each(p, &snd_timer_list) {
135 timer = list_entry(p, struct snd_timer, 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(struct snd_timer_id *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(struct snd_timer_instance *slave)
183 {
184 struct snd_timer *timer;
185 struct snd_timer_instance *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, struct snd_timer, device_list);
191 list_for_each(q, &timer->open_list_head) {
192 master = list_entry(q, struct snd_timer_instance, 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(struct snd_timer_instance *master)
215 {
216 struct snd_timer_instance *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, struct snd_timer_instance, 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(struct snd_timer_instance **ti,
242 char *owner, struct snd_timer_id *tid,
243 unsigned int slave_id)
244 {
245 struct snd_timer *timer;
246 struct snd_timer_instance *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 struct snd_timer_instance, 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(struct snd_timer_instance *timeri,
311 int keep_flag, int event);
312
313 /*
314 * close a timer instance
315 */
316 int snd_timer_close(struct snd_timer_instance *timeri)
317 {
318 struct snd_timer *timer = NULL;
319 struct list_head *p, *n;
320 struct snd_timer_instance *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, struct snd_timer_instance, 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(struct snd_timer_instance *timeri)
377 {
378 struct snd_timer * 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(struct snd_timer_instance *ti, int event)
391 {
392 struct snd_timer *timer;
393 unsigned long flags;
394 unsigned long resolution = 0;
395 struct snd_timer_instance *ts;
396 struct list_head *n;
397 struct timespec tstamp;
398
399 getnstimeofday(&tstamp);
400 snd_assert(event >= SNDRV_TIMER_EVENT_START &&
401 event <= SNDRV_TIMER_EVENT_PAUSE, return);
402 if (event == SNDRV_TIMER_EVENT_START ||
403 event == SNDRV_TIMER_EVENT_CONTINUE)
404 resolution = snd_timer_resolution(ti);
405 if (ti->ccallback)
406 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
407 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
408 return;
409 timer = ti->timer;
410 if (timer == NULL)
411 return;
412 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
413 return;
414 spin_lock_irqsave(&timer->lock, flags);
415 list_for_each(n, &ti->slave_active_head) {
416 ts = list_entry(n, struct snd_timer_instance, active_list);
417 if (ts->ccallback)
418 ts->ccallback(ti, event + 100, &tstamp, resolution);
419 }
420 spin_unlock_irqrestore(&timer->lock, flags);
421 }
422
423 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
424 unsigned long sticks)
425 {
426 list_del(&timeri->active_list);
427 list_add_tail(&timeri->active_list, &timer->active_list_head);
428 if (timer->running) {
429 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
430 goto __start_now;
431 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
432 timeri->flags |= SNDRV_TIMER_IFLG_START;
433 return 1; /* delayed start */
434 } else {
435 timer->sticks = sticks;
436 timer->hw.start(timer);
437 __start_now:
438 timer->running++;
439 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
440 return 0;
441 }
442 }
443
444 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
445 {
446 unsigned long flags;
447
448 spin_lock_irqsave(&slave_active_lock, flags);
449 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
450 if (timeri->master)
451 list_add_tail(&timeri->active_list,
452 &timeri->master->slave_active_head);
453 spin_unlock_irqrestore(&slave_active_lock, flags);
454 return 1; /* delayed start */
455 }
456
457 /*
458 * start the timer instance
459 */
460 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
461 {
462 struct snd_timer *timer;
463 int result = -EINVAL;
464 unsigned long flags;
465
466 if (timeri == NULL || ticks < 1)
467 return -EINVAL;
468 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
469 result = snd_timer_start_slave(timeri);
470 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
471 return result;
472 }
473 timer = timeri->timer;
474 if (timer == NULL)
475 return -EINVAL;
476 spin_lock_irqsave(&timer->lock, flags);
477 timeri->ticks = timeri->cticks = ticks;
478 timeri->pticks = 0;
479 result = snd_timer_start1(timer, timeri, ticks);
480 spin_unlock_irqrestore(&timer->lock, flags);
481 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
482 return result;
483 }
484
485 static int _snd_timer_stop(struct snd_timer_instance * timeri,
486 int keep_flag, int event)
487 {
488 struct snd_timer *timer;
489 unsigned long flags;
490
491 snd_assert(timeri != NULL, return -ENXIO);
492
493 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
494 if (!keep_flag) {
495 spin_lock_irqsave(&slave_active_lock, flags);
496 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
497 spin_unlock_irqrestore(&slave_active_lock, flags);
498 }
499 goto __end;
500 }
501 timer = timeri->timer;
502 if (!timer)
503 return -EINVAL;
504 spin_lock_irqsave(&timer->lock, flags);
505 list_del_init(&timeri->ack_list);
506 list_del_init(&timeri->active_list);
507 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
508 !(--timer->running)) {
509 timer->hw.stop(timer);
510 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
511 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
512 snd_timer_reschedule(timer, 0);
513 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
514 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
515 timer->hw.start(timer);
516 }
517 }
518 }
519 if (!keep_flag)
520 timeri->flags &=
521 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
522 spin_unlock_irqrestore(&timer->lock, flags);
523 __end:
524 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
525 snd_timer_notify1(timeri, event);
526 return 0;
527 }
528
529 /*
530 * stop the timer instance.
531 *
532 * do not call this from the timer callback!
533 */
534 int snd_timer_stop(struct snd_timer_instance *timeri)
535 {
536 struct snd_timer *timer;
537 unsigned long flags;
538 int err;
539
540 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
541 if (err < 0)
542 return err;
543 timer = timeri->timer;
544 spin_lock_irqsave(&timer->lock, flags);
545 timeri->cticks = timeri->ticks;
546 timeri->pticks = 0;
547 spin_unlock_irqrestore(&timer->lock, flags);
548 return 0;
549 }
550
551 /*
552 * start again.. the tick is kept.
553 */
554 int snd_timer_continue(struct snd_timer_instance *timeri)
555 {
556 struct snd_timer *timer;
557 int result = -EINVAL;
558 unsigned long flags;
559
560 if (timeri == NULL)
561 return result;
562 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
563 return snd_timer_start_slave(timeri);
564 timer = timeri->timer;
565 if (! timer)
566 return -EINVAL;
567 spin_lock_irqsave(&timer->lock, flags);
568 if (!timeri->cticks)
569 timeri->cticks = 1;
570 timeri->pticks = 0;
571 result = snd_timer_start1(timer, timeri, timer->sticks);
572 spin_unlock_irqrestore(&timer->lock, flags);
573 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
574 return result;
575 }
576
577 /*
578 * pause.. remember the ticks left
579 */
580 int snd_timer_pause(struct snd_timer_instance * timeri)
581 {
582 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
583 }
584
585 /*
586 * reschedule the timer
587 *
588 * start pending instances and check the scheduling ticks.
589 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
590 */
591 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
592 {
593 struct snd_timer_instance *ti;
594 unsigned long ticks = ~0UL;
595 struct list_head *p;
596
597 list_for_each(p, &timer->active_list_head) {
598 ti = list_entry(p, struct snd_timer_instance, active_list);
599 if (ti->flags & SNDRV_TIMER_IFLG_START) {
600 ti->flags &= ~SNDRV_TIMER_IFLG_START;
601 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
602 timer->running++;
603 }
604 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
605 if (ticks > ti->cticks)
606 ticks = ti->cticks;
607 }
608 }
609 if (ticks == ~0UL) {
610 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
611 return;
612 }
613 if (ticks > timer->hw.ticks)
614 ticks = timer->hw.ticks;
615 if (ticks_left != ticks)
616 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
617 timer->sticks = ticks;
618 }
619
620 /*
621 * timer tasklet
622 *
623 */
624 static void snd_timer_tasklet(unsigned long arg)
625 {
626 struct snd_timer *timer = (struct snd_timer *) arg;
627 struct snd_timer_instance *ti;
628 struct list_head *p;
629 unsigned long resolution, ticks;
630
631 spin_lock(&timer->lock);
632 /* now process all callbacks */
633 while (!list_empty(&timer->sack_list_head)) {
634 p = timer->sack_list_head.next; /* get first item */
635 ti = list_entry(p, struct snd_timer_instance, ack_list);
636
637 /* remove from ack_list and make empty */
638 list_del_init(p);
639
640 ticks = ti->pticks;
641 ti->pticks = 0;
642 resolution = ti->resolution;
643
644 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
645 spin_unlock(&timer->lock);
646 if (ti->callback)
647 ti->callback(ti, resolution, ticks);
648 spin_lock(&timer->lock);
649 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
650 }
651 spin_unlock(&timer->lock);
652 }
653
654 /*
655 * timer interrupt
656 *
657 * ticks_left is usually equal to timer->sticks.
658 *
659 */
660 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
661 {
662 struct snd_timer_instance *ti, *ts;
663 unsigned long resolution, ticks;
664 struct list_head *p, *q, *n, *ack_list_head;
665 unsigned long flags;
666 int use_tasklet = 0;
667
668 if (timer == NULL)
669 return;
670
671 spin_lock_irqsave(&timer->lock, flags);
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, struct snd_timer_instance, 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, struct snd_timer_instance, 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, struct snd_timer_instance, 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_irqrestore(&timer->lock, flags);
757
758 if (use_tasklet)
759 tasklet_hi_schedule(&timer->task_queue);
760 }
761
762 /*
763
764 */
765
766 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
767 struct snd_timer **rtimer)
768 {
769 struct snd_timer *timer;
770 int err;
771 static struct snd_device_ops 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 snd_printk(KERN_ERR "timer: cannot allocate\n");
783 return -ENOMEM;
784 }
785 timer->tmr_class = tid->dev_class;
786 timer->card = card;
787 timer->tmr_device = tid->device;
788 timer->tmr_subdevice = tid->subdevice;
789 if (id)
790 strlcpy(timer->id, id, sizeof(timer->id));
791 INIT_LIST_HEAD(&timer->device_list);
792 INIT_LIST_HEAD(&timer->open_list_head);
793 INIT_LIST_HEAD(&timer->active_list_head);
794 INIT_LIST_HEAD(&timer->ack_list_head);
795 INIT_LIST_HEAD(&timer->sack_list_head);
796 spin_lock_init(&timer->lock);
797 tasklet_init(&timer->task_queue, snd_timer_tasklet,
798 (unsigned long)timer);
799 if (card != NULL) {
800 timer->module = card->module;
801 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
802 if (err < 0) {
803 snd_timer_free(timer);
804 return err;
805 }
806 }
807 *rtimer = timer;
808 return 0;
809 }
810
811 static int snd_timer_free(struct snd_timer *timer)
812 {
813 snd_assert(timer != NULL, return -ENXIO);
814 if (timer->private_free)
815 timer->private_free(timer);
816 kfree(timer);
817 return 0;
818 }
819
820 static int snd_timer_dev_free(struct snd_device *device)
821 {
822 struct snd_timer *timer = device->device_data;
823 return snd_timer_free(timer);
824 }
825
826 static int snd_timer_dev_register(struct snd_device *dev)
827 {
828 struct snd_timer *timer = dev->device_data;
829 struct snd_timer *timer1;
830 struct list_head *p;
831
832 snd_assert(timer != NULL && timer->hw.start != NULL &&
833 timer->hw.stop != NULL, return -ENXIO);
834 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
835 !timer->hw.resolution && timer->hw.c_resolution == NULL)
836 return -EINVAL;
837
838 down(&register_mutex);
839 list_for_each(p, &snd_timer_list) {
840 timer1 = list_entry(p, struct snd_timer, device_list);
841 if (timer1->tmr_class > timer->tmr_class)
842 break;
843 if (timer1->tmr_class < timer->tmr_class)
844 continue;
845 if (timer1->card && timer->card) {
846 if (timer1->card->number > timer->card->number)
847 break;
848 if (timer1->card->number < timer->card->number)
849 continue;
850 }
851 if (timer1->tmr_device > timer->tmr_device)
852 break;
853 if (timer1->tmr_device < timer->tmr_device)
854 continue;
855 if (timer1->tmr_subdevice > timer->tmr_subdevice)
856 break;
857 if (timer1->tmr_subdevice < timer->tmr_subdevice)
858 continue;
859 /* conflicts.. */
860 up(&register_mutex);
861 return -EBUSY;
862 }
863 list_add_tail(&timer->device_list, p);
864 up(&register_mutex);
865 return 0;
866 }
867
868 static int snd_timer_unregister(struct snd_timer *timer)
869 {
870 struct list_head *p, *n;
871 struct snd_timer_instance *ti;
872
873 snd_assert(timer != NULL, return -ENXIO);
874 down(&register_mutex);
875 if (! list_empty(&timer->open_list_head)) {
876 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer);
877 list_for_each_safe(p, n, &timer->open_list_head) {
878 list_del_init(p);
879 ti = list_entry(p, struct snd_timer_instance, open_list);
880 ti->timer = NULL;
881 }
882 }
883 list_del(&timer->device_list);
884 up(&register_mutex);
885 return snd_timer_free(timer);
886 }
887
888 static int snd_timer_dev_unregister(struct snd_device *device)
889 {
890 struct snd_timer *timer = device->device_data;
891 return snd_timer_unregister(timer);
892 }
893
894 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
895 {
896 unsigned long flags;
897 unsigned long resolution = 0;
898 struct snd_timer_instance *ti, *ts;
899 struct list_head *p, *n;
900
901 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
902 return;
903 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART &&
904 event <= SNDRV_TIMER_EVENT_MRESUME, return);
905 spin_lock_irqsave(&timer->lock, flags);
906 if (event == SNDRV_TIMER_EVENT_MSTART ||
907 event == SNDRV_TIMER_EVENT_MCONTINUE ||
908 event == SNDRV_TIMER_EVENT_MRESUME) {
909 if (timer->hw.c_resolution)
910 resolution = timer->hw.c_resolution(timer);
911 else
912 resolution = timer->hw.resolution;
913 }
914 list_for_each(p, &timer->active_list_head) {
915 ti = list_entry(p, struct snd_timer_instance, active_list);
916 if (ti->ccallback)
917 ti->ccallback(ti, event, tstamp, resolution);
918 list_for_each(n, &ti->slave_active_head) {
919 ts = list_entry(n, struct snd_timer_instance, active_list);
920 if (ts->ccallback)
921 ts->ccallback(ts, event, tstamp, resolution);
922 }
923 }
924 spin_unlock_irqrestore(&timer->lock, flags);
925 }
926
927 /*
928 * exported functions for global timers
929 */
930 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
931 {
932 struct snd_timer_id tid;
933
934 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
935 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
936 tid.card = -1;
937 tid.device = device;
938 tid.subdevice = 0;
939 return snd_timer_new(NULL, id, &tid, rtimer);
940 }
941
942 int snd_timer_global_free(struct snd_timer *timer)
943 {
944 return snd_timer_free(timer);
945 }
946
947 int snd_timer_global_register(struct snd_timer *timer)
948 {
949 struct snd_device dev;
950
951 memset(&dev, 0, sizeof(dev));
952 dev.device_data = timer;
953 return snd_timer_dev_register(&dev);
954 }
955
956 int snd_timer_global_unregister(struct snd_timer *timer)
957 {
958 return snd_timer_unregister(timer);
959 }
960
961 /*
962 * System timer
963 */
964
965 struct snd_timer_system_private {
966 struct timer_list tlist;
967 struct timer * timer;
968 unsigned long last_expires;
969 unsigned long last_jiffies;
970 unsigned long correction;
971 };
972
973 static void snd_timer_s_function(unsigned long data)
974 {
975 struct snd_timer *timer = (struct snd_timer *)data;
976 struct snd_timer_system_private *priv = timer->private_data;
977 unsigned long jiff = jiffies;
978 if (time_after(jiff, priv->last_expires))
979 priv->correction = (long)jiff - (long)priv->last_expires;
980 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
981 }
982
983 static int snd_timer_s_start(struct snd_timer * timer)
984 {
985 struct snd_timer_system_private *priv;
986 unsigned long njiff;
987
988 priv = (struct snd_timer_system_private *) timer->private_data;
989 njiff = (priv->last_jiffies = jiffies);
990 if (priv->correction > timer->sticks - 1) {
991 priv->correction -= timer->sticks - 1;
992 njiff++;
993 } else {
994 njiff += timer->sticks - priv->correction;
995 priv->correction -= timer->sticks;
996 }
997 priv->last_expires = priv->tlist.expires = njiff;
998 add_timer(&priv->tlist);
999 return 0;
1000 }
1001
1002 static int snd_timer_s_stop(struct snd_timer * timer)
1003 {
1004 struct snd_timer_system_private *priv;
1005 unsigned long jiff;
1006
1007 priv = (struct snd_timer_system_private *) timer->private_data;
1008 del_timer(&priv->tlist);
1009 jiff = jiffies;
1010 if (time_before(jiff, priv->last_expires))
1011 timer->sticks = priv->last_expires - jiff;
1012 else
1013 timer->sticks = 1;
1014 return 0;
1015 }
1016
1017 static struct snd_timer_hardware snd_timer_system =
1018 {
1019 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1020 .resolution = 1000000000L / HZ,
1021 .ticks = 10000000L,
1022 .start = snd_timer_s_start,
1023 .stop = snd_timer_s_stop
1024 };
1025
1026 static void snd_timer_free_system(struct snd_timer *timer)
1027 {
1028 kfree(timer->private_data);
1029 }
1030
1031 static int snd_timer_register_system(void)
1032 {
1033 struct snd_timer *timer;
1034 struct snd_timer_system_private *priv;
1035 int err;
1036
1037 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1038 if (err < 0)
1039 return err;
1040 strcpy(timer->name, "system timer");
1041 timer->hw = snd_timer_system;
1042 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1043 if (priv == NULL) {
1044 snd_timer_free(timer);
1045 return -ENOMEM;
1046 }
1047 init_timer(&priv->tlist);
1048 priv->tlist.function = snd_timer_s_function;
1049 priv->tlist.data = (unsigned long) timer;
1050 timer->private_data = priv;
1051 timer->private_free = snd_timer_free_system;
1052 return snd_timer_global_register(timer);
1053 }
1054
1055 /*
1056 * Info interface
1057 */
1058
1059 static void snd_timer_proc_read(struct snd_info_entry *entry,
1060 struct snd_info_buffer *buffer)
1061 {
1062 unsigned long flags;
1063 struct snd_timer *timer;
1064 struct snd_timer_instance *ti;
1065 struct list_head *p, *q;
1066
1067 down(&register_mutex);
1068 list_for_each(p, &snd_timer_list) {
1069 timer = list_entry(p, struct snd_timer, device_list);
1070 switch (timer->tmr_class) {
1071 case SNDRV_TIMER_CLASS_GLOBAL:
1072 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1073 break;
1074 case SNDRV_TIMER_CLASS_CARD:
1075 snd_iprintf(buffer, "C%i-%i: ",
1076 timer->card->number, timer->tmr_device);
1077 break;
1078 case SNDRV_TIMER_CLASS_PCM:
1079 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1080 timer->tmr_device, timer->tmr_subdevice);
1081 break;
1082 default:
1083 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1084 timer->card ? timer->card->number : -1,
1085 timer->tmr_device, timer->tmr_subdevice);
1086 }
1087 snd_iprintf(buffer, "%s :", timer->name);
1088 if (timer->hw.resolution)
1089 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1090 timer->hw.resolution / 1000,
1091 timer->hw.resolution % 1000,
1092 timer->hw.ticks);
1093 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1094 snd_iprintf(buffer, " SLAVE");
1095 snd_iprintf(buffer, "\n");
1096 spin_lock_irqsave(&timer->lock, flags);
1097 list_for_each(q, &timer->open_list_head) {
1098 ti = list_entry(q, struct snd_timer_instance, open_list);
1099 snd_iprintf(buffer, " Client %s : %s\n",
1100 ti->owner ? ti->owner : "unknown",
1101 ti->flags & (SNDRV_TIMER_IFLG_START |
1102 SNDRV_TIMER_IFLG_RUNNING)
1103 ? "running" : "stopped");
1104 }
1105 spin_unlock_irqrestore(&timer->lock, flags);
1106 }
1107 up(&register_mutex);
1108 }
1109
1110 /*
1111 * USER SPACE interface
1112 */
1113
1114 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1115 unsigned long resolution,
1116 unsigned long ticks)
1117 {
1118 struct snd_timer_user *tu = timeri->callback_data;
1119 struct snd_timer_read *r;
1120 int prev;
1121
1122 spin_lock(&tu->qlock);
1123 if (tu->qused > 0) {
1124 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1125 r = &tu->queue[prev];
1126 if (r->resolution == resolution) {
1127 r->ticks += ticks;
1128 goto __wake;
1129 }
1130 }
1131 if (tu->qused >= tu->queue_size) {
1132 tu->overrun++;
1133 } else {
1134 r = &tu->queue[tu->qtail++];
1135 tu->qtail %= tu->queue_size;
1136 r->resolution = resolution;
1137 r->ticks = ticks;
1138 tu->qused++;
1139 }
1140 __wake:
1141 spin_unlock(&tu->qlock);
1142 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1143 wake_up(&tu->qchange_sleep);
1144 }
1145
1146 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1147 struct snd_timer_tread *tread)
1148 {
1149 if (tu->qused >= tu->queue_size) {
1150 tu->overrun++;
1151 } else {
1152 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1153 tu->qtail %= tu->queue_size;
1154 tu->qused++;
1155 }
1156 }
1157
1158 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1159 int event,
1160 struct timespec *tstamp,
1161 unsigned long resolution)
1162 {
1163 struct snd_timer_user *tu = timeri->callback_data;
1164 struct snd_timer_tread r1;
1165
1166 if (event >= SNDRV_TIMER_EVENT_START &&
1167 event <= SNDRV_TIMER_EVENT_PAUSE)
1168 tu->tstamp = *tstamp;
1169 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1170 return;
1171 r1.event = event;
1172 r1.tstamp = *tstamp;
1173 r1.val = resolution;
1174 spin_lock(&tu->qlock);
1175 snd_timer_user_append_to_tqueue(tu, &r1);
1176 spin_unlock(&tu->qlock);
1177 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1178 wake_up(&tu->qchange_sleep);
1179 }
1180
1181 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1182 unsigned long resolution,
1183 unsigned long ticks)
1184 {
1185 struct snd_timer_user *tu = timeri->callback_data;
1186 struct snd_timer_tread *r, r1;
1187 struct timespec tstamp;
1188 int prev, append = 0;
1189
1190 memset(&tstamp, 0, sizeof(tstamp));
1191 spin_lock(&tu->qlock);
1192 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1193 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1194 spin_unlock(&tu->qlock);
1195 return;
1196 }
1197 if (tu->last_resolution != resolution || ticks > 0)
1198 getnstimeofday(&tstamp);
1199 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1200 tu->last_resolution != resolution) {
1201 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1202 r1.tstamp = tstamp;
1203 r1.val = resolution;
1204 snd_timer_user_append_to_tqueue(tu, &r1);
1205 tu->last_resolution = resolution;
1206 append++;
1207 }
1208 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1209 goto __wake;
1210 if (ticks == 0)
1211 goto __wake;
1212 if (tu->qused > 0) {
1213 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1214 r = &tu->tqueue[prev];
1215 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1216 r->tstamp = tstamp;
1217 r->val += ticks;
1218 append++;
1219 goto __wake;
1220 }
1221 }
1222 r1.event = SNDRV_TIMER_EVENT_TICK;
1223 r1.tstamp = tstamp;
1224 r1.val = ticks;
1225 snd_timer_user_append_to_tqueue(tu, &r1);
1226 append++;
1227 __wake:
1228 spin_unlock(&tu->qlock);
1229 if (append == 0)
1230 return;
1231 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1232 wake_up(&tu->qchange_sleep);
1233 }
1234
1235 static int snd_timer_user_open(struct inode *inode, struct file *file)
1236 {
1237 struct snd_timer_user *tu;
1238
1239 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1240 if (tu == NULL)
1241 return -ENOMEM;
1242 spin_lock_init(&tu->qlock);
1243 init_waitqueue_head(&tu->qchange_sleep);
1244 init_MUTEX(&tu->tread_sem);
1245 tu->ticks = 1;
1246 tu->queue_size = 128;
1247 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1248 GFP_KERNEL);
1249 if (tu->queue == NULL) {
1250 kfree(tu);
1251 return -ENOMEM;
1252 }
1253 file->private_data = tu;
1254 return 0;
1255 }
1256
1257 static int snd_timer_user_release(struct inode *inode, struct file *file)
1258 {
1259 struct snd_timer_user *tu;
1260
1261 if (file->private_data) {
1262 tu = file->private_data;
1263 file->private_data = NULL;
1264 fasync_helper(-1, file, 0, &tu->fasync);
1265 if (tu->timeri)
1266 snd_timer_close(tu->timeri);
1267 kfree(tu->queue);
1268 kfree(tu->tqueue);
1269 kfree(tu);
1270 }
1271 return 0;
1272 }
1273
1274 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1275 {
1276 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1277 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1278 id->card = -1;
1279 id->device = -1;
1280 id->subdevice = -1;
1281 }
1282
1283 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1284 {
1285 id->dev_class = timer->tmr_class;
1286 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1287 id->card = timer->card ? timer->card->number : -1;
1288 id->device = timer->tmr_device;
1289 id->subdevice = timer->tmr_subdevice;
1290 }
1291
1292 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1293 {
1294 struct snd_timer_id id;
1295 struct snd_timer *timer;
1296 struct list_head *p;
1297
1298 if (copy_from_user(&id, _tid, sizeof(id)))
1299 return -EFAULT;
1300 down(&register_mutex);
1301 if (id.dev_class < 0) { /* first item */
1302 if (list_empty(&snd_timer_list))
1303 snd_timer_user_zero_id(&id);
1304 else {
1305 timer = list_entry(snd_timer_list.next,
1306 struct snd_timer, device_list);
1307 snd_timer_user_copy_id(&id, timer);
1308 }
1309 } else {
1310 switch (id.dev_class) {
1311 case SNDRV_TIMER_CLASS_GLOBAL:
1312 id.device = id.device < 0 ? 0 : id.device + 1;
1313 list_for_each(p, &snd_timer_list) {
1314 timer = list_entry(p, struct snd_timer, device_list);
1315 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1316 snd_timer_user_copy_id(&id, timer);
1317 break;
1318 }
1319 if (timer->tmr_device >= id.device) {
1320 snd_timer_user_copy_id(&id, timer);
1321 break;
1322 }
1323 }
1324 if (p == &snd_timer_list)
1325 snd_timer_user_zero_id(&id);
1326 break;
1327 case SNDRV_TIMER_CLASS_CARD:
1328 case SNDRV_TIMER_CLASS_PCM:
1329 if (id.card < 0) {
1330 id.card = 0;
1331 } else {
1332 if (id.card < 0) {
1333 id.card = 0;
1334 } else {
1335 if (id.device < 0) {
1336 id.device = 0;
1337 } else {
1338 if (id.subdevice < 0) {
1339 id.subdevice = 0;
1340 } else {
1341 id.subdevice++;
1342 }
1343 }
1344 }
1345 }
1346 list_for_each(p, &snd_timer_list) {
1347 timer = list_entry(p, struct snd_timer, device_list);
1348 if (timer->tmr_class > id.dev_class) {
1349 snd_timer_user_copy_id(&id, timer);
1350 break;
1351 }
1352 if (timer->tmr_class < id.dev_class)
1353 continue;
1354 if (timer->card->number > id.card) {
1355 snd_timer_user_copy_id(&id, timer);
1356 break;
1357 }
1358 if (timer->card->number < id.card)
1359 continue;
1360 if (timer->tmr_device > id.device) {
1361 snd_timer_user_copy_id(&id, timer);
1362 break;
1363 }
1364 if (timer->tmr_device < id.device)
1365 continue;
1366 if (timer->tmr_subdevice > id.subdevice) {
1367 snd_timer_user_copy_id(&id, timer);
1368 break;
1369 }
1370 if (timer->tmr_subdevice < id.subdevice)
1371 continue;
1372 snd_timer_user_copy_id(&id, timer);
1373 break;
1374 }
1375 if (p == &snd_timer_list)
1376 snd_timer_user_zero_id(&id);
1377 break;
1378 default:
1379 snd_timer_user_zero_id(&id);
1380 }
1381 }
1382 up(&register_mutex);
1383 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1384 return -EFAULT;
1385 return 0;
1386 }
1387
1388 static int snd_timer_user_ginfo(struct file *file,
1389 struct snd_timer_ginfo __user *_ginfo)
1390 {
1391 struct snd_timer_ginfo *ginfo;
1392 struct snd_timer_id tid;
1393 struct snd_timer *t;
1394 struct list_head *p;
1395 int err = 0;
1396
1397 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1398 if (! ginfo)
1399 return -ENOMEM;
1400 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1401 kfree(ginfo);
1402 return -EFAULT;
1403 }
1404 tid = ginfo->tid;
1405 memset(ginfo, 0, sizeof(*ginfo));
1406 ginfo->tid = tid;
1407 down(&register_mutex);
1408 t = snd_timer_find(&tid);
1409 if (t != NULL) {
1410 ginfo->card = t->card ? t->card->number : -1;
1411 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1412 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1413 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1414 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1415 ginfo->resolution = t->hw.resolution;
1416 if (t->hw.resolution_min > 0) {
1417 ginfo->resolution_min = t->hw.resolution_min;
1418 ginfo->resolution_max = t->hw.resolution_max;
1419 }
1420 list_for_each(p, &t->open_list_head) {
1421 ginfo->clients++;
1422 }
1423 } else {
1424 err = -ENODEV;
1425 }
1426 up(&register_mutex);
1427 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1428 err = -EFAULT;
1429 kfree(ginfo);
1430 return err;
1431 }
1432
1433 static int snd_timer_user_gparams(struct file *file,
1434 struct snd_timer_gparams __user *_gparams)
1435 {
1436 struct snd_timer_gparams gparams;
1437 struct snd_timer *t;
1438 int err;
1439
1440 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1441 return -EFAULT;
1442 down(&register_mutex);
1443 t = snd_timer_find(&gparams.tid);
1444 if (!t) {
1445 err = -ENODEV;
1446 goto _error;
1447 }
1448 if (!list_empty(&t->open_list_head)) {
1449 err = -EBUSY;
1450 goto _error;
1451 }
1452 if (!t->hw.set_period) {
1453 err = -ENOSYS;
1454 goto _error;
1455 }
1456 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1457 _error:
1458 up(&register_mutex);
1459 return err;
1460 }
1461
1462 static int snd_timer_user_gstatus(struct file *file,
1463 struct snd_timer_gstatus __user *_gstatus)
1464 {
1465 struct snd_timer_gstatus gstatus;
1466 struct snd_timer_id tid;
1467 struct snd_timer *t;
1468 int err = 0;
1469
1470 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1471 return -EFAULT;
1472 tid = gstatus.tid;
1473 memset(&gstatus, 0, sizeof(gstatus));
1474 gstatus.tid = tid;
1475 down(&register_mutex);
1476 t = snd_timer_find(&tid);
1477 if (t != NULL) {
1478 if (t->hw.c_resolution)
1479 gstatus.resolution = t->hw.c_resolution(t);
1480 else
1481 gstatus.resolution = t->hw.resolution;
1482 if (t->hw.precise_resolution) {
1483 t->hw.precise_resolution(t, &gstatus.resolution_num,
1484 &gstatus.resolution_den);
1485 } else {
1486 gstatus.resolution_num = gstatus.resolution;
1487 gstatus.resolution_den = 1000000000uL;
1488 }
1489 } else {
1490 err = -ENODEV;
1491 }
1492 up(&register_mutex);
1493 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1494 err = -EFAULT;
1495 return err;
1496 }
1497
1498 static int snd_timer_user_tselect(struct file *file,
1499 struct snd_timer_select __user *_tselect)
1500 {
1501 struct snd_timer_user *tu;
1502 struct snd_timer_select tselect;
1503 char str[32];
1504 int err = 0;
1505
1506 tu = file->private_data;
1507 down(&tu->tread_sem);
1508 if (tu->timeri) {
1509 snd_timer_close(tu->timeri);
1510 tu->timeri = NULL;
1511 }
1512 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1513 err = -EFAULT;
1514 goto __err;
1515 }
1516 sprintf(str, "application %i", current->pid);
1517 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1518 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1519 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1520 if (err < 0)
1521 goto __err;
1522
1523 kfree(tu->queue);
1524 tu->queue = NULL;
1525 kfree(tu->tqueue);
1526 tu->tqueue = NULL;
1527 if (tu->tread) {
1528 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1529 GFP_KERNEL);
1530 if (tu->tqueue == NULL)
1531 err = -ENOMEM;
1532 } else {
1533 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1534 GFP_KERNEL);
1535 if (tu->queue == NULL)
1536 err = -ENOMEM;
1537 }
1538
1539 if (err < 0) {
1540 snd_timer_close(tu->timeri);
1541 tu->timeri = NULL;
1542 } else {
1543 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1544 tu->timeri->callback = tu->tread
1545 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1546 tu->timeri->ccallback = snd_timer_user_ccallback;
1547 tu->timeri->callback_data = (void *)tu;
1548 }
1549
1550 __err:
1551 up(&tu->tread_sem);
1552 return err;
1553 }
1554
1555 static int snd_timer_user_info(struct file *file,
1556 struct snd_timer_info __user *_info)
1557 {
1558 struct snd_timer_user *tu;
1559 struct snd_timer_info *info;
1560 struct snd_timer *t;
1561 int err = 0;
1562
1563 tu = file->private_data;
1564 snd_assert(tu->timeri != NULL, return -ENXIO);
1565 t = tu->timeri->timer;
1566 snd_assert(t != NULL, return -ENXIO);
1567
1568 info = kzalloc(sizeof(*info), GFP_KERNEL);
1569 if (! info)
1570 return -ENOMEM;
1571 info->card = t->card ? t->card->number : -1;
1572 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1573 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1574 strlcpy(info->id, t->id, sizeof(info->id));
1575 strlcpy(info->name, t->name, sizeof(info->name));
1576 info->resolution = t->hw.resolution;
1577 if (copy_to_user(_info, info, sizeof(*_info)))
1578 err = -EFAULT;
1579 kfree(info);
1580 return err;
1581 }
1582
1583 static int snd_timer_user_params(struct file *file,
1584 struct snd_timer_params __user *_params)
1585 {
1586 struct snd_timer_user *tu;
1587 struct snd_timer_params params;
1588 struct snd_timer *t;
1589 struct snd_timer_read *tr;
1590 struct snd_timer_tread *ttr;
1591 int err;
1592
1593 tu = file->private_data;
1594 snd_assert(tu->timeri != NULL, return -ENXIO);
1595 t = tu->timeri->timer;
1596 snd_assert(t != NULL, return -ENXIO);
1597 if (copy_from_user(&params, _params, sizeof(params)))
1598 return -EFAULT;
1599 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1600 err = -EINVAL;
1601 goto _end;
1602 }
1603 if (params.queue_size > 0 &&
1604 (params.queue_size < 32 || params.queue_size > 1024)) {
1605 err = -EINVAL;
1606 goto _end;
1607 }
1608 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1609 (1<<SNDRV_TIMER_EVENT_TICK)|
1610 (1<<SNDRV_TIMER_EVENT_START)|
1611 (1<<SNDRV_TIMER_EVENT_STOP)|
1612 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1613 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1614 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1615 (1<<SNDRV_TIMER_EVENT_RESUME)|
1616 (1<<SNDRV_TIMER_EVENT_MSTART)|
1617 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1618 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1619 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1620 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1621 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1622 err = -EINVAL;
1623 goto _end;
1624 }
1625 snd_timer_stop(tu->timeri);
1626 spin_lock_irq(&t->lock);
1627 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1628 SNDRV_TIMER_IFLG_EXCLUSIVE|
1629 SNDRV_TIMER_IFLG_EARLY_EVENT);
1630 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1631 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1632 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1633 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1634 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1635 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1636 spin_unlock_irq(&t->lock);
1637 if (params.queue_size > 0 &&
1638 (unsigned int)tu->queue_size != params.queue_size) {
1639 if (tu->tread) {
1640 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1641 GFP_KERNEL);
1642 if (ttr) {
1643 kfree(tu->tqueue);
1644 tu->queue_size = params.queue_size;
1645 tu->tqueue = ttr;
1646 }
1647 } else {
1648 tr = kmalloc(params.queue_size * sizeof(*tr),
1649 GFP_KERNEL);
1650 if (tr) {
1651 kfree(tu->queue);
1652 tu->queue_size = params.queue_size;
1653 tu->queue = tr;
1654 }
1655 }
1656 }
1657 tu->qhead = tu->qtail = tu->qused = 0;
1658 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1659 if (tu->tread) {
1660 struct snd_timer_tread tread;
1661 tread.event = SNDRV_TIMER_EVENT_EARLY;
1662 tread.tstamp.tv_sec = 0;
1663 tread.tstamp.tv_nsec = 0;
1664 tread.val = 0;
1665 snd_timer_user_append_to_tqueue(tu, &tread);
1666 } else {
1667 struct snd_timer_read *r = &tu->queue[0];
1668 r->resolution = 0;
1669 r->ticks = 0;
1670 tu->qused++;
1671 tu->qtail++;
1672 }
1673 }
1674 tu->filter = params.filter;
1675 tu->ticks = params.ticks;
1676 err = 0;
1677 _end:
1678 if (copy_to_user(_params, &params, sizeof(params)))
1679 return -EFAULT;
1680 return err;
1681 }
1682
1683 static int snd_timer_user_status(struct file *file,
1684 struct snd_timer_status __user *_status)
1685 {
1686 struct snd_timer_user *tu;
1687 struct snd_timer_status status;
1688
1689 tu = file->private_data;
1690 snd_assert(tu->timeri != NULL, return -ENXIO);
1691 memset(&status, 0, sizeof(status));
1692 status.tstamp = tu->tstamp;
1693 status.resolution = snd_timer_resolution(tu->timeri);
1694 status.lost = tu->timeri->lost;
1695 status.overrun = tu->overrun;
1696 spin_lock_irq(&tu->qlock);
1697 status.queue = tu->qused;
1698 spin_unlock_irq(&tu->qlock);
1699 if (copy_to_user(_status, &status, sizeof(status)))
1700 return -EFAULT;
1701 return 0;
1702 }
1703
1704 static int snd_timer_user_start(struct file *file)
1705 {
1706 int err;
1707 struct snd_timer_user *tu;
1708
1709 tu = file->private_data;
1710 snd_assert(tu->timeri != NULL, return -ENXIO);
1711 snd_timer_stop(tu->timeri);
1712 tu->timeri->lost = 0;
1713 tu->last_resolution = 0;
1714 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1715 }
1716
1717 static int snd_timer_user_stop(struct file *file)
1718 {
1719 int err;
1720 struct snd_timer_user *tu;
1721
1722 tu = file->private_data;
1723 snd_assert(tu->timeri != NULL, return -ENXIO);
1724 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1725 }
1726
1727 static int snd_timer_user_continue(struct file *file)
1728 {
1729 int err;
1730 struct snd_timer_user *tu;
1731
1732 tu = file->private_data;
1733 snd_assert(tu->timeri != NULL, return -ENXIO);
1734 tu->timeri->lost = 0;
1735 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1736 }
1737
1738 static int snd_timer_user_pause(struct file *file)
1739 {
1740 int err;
1741 struct snd_timer_user *tu;
1742
1743 tu = file->private_data;
1744 snd_assert(tu->timeri != NULL, return -ENXIO);
1745 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1746 }
1747
1748 enum {
1749 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1750 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1751 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1752 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1753 };
1754
1755 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1756 unsigned long arg)
1757 {
1758 struct snd_timer_user *tu;
1759 void __user *argp = (void __user *)arg;
1760 int __user *p = argp;
1761
1762 tu = file->private_data;
1763 switch (cmd) {
1764 case SNDRV_TIMER_IOCTL_PVERSION:
1765 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1766 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1767 return snd_timer_user_next_device(argp);
1768 case SNDRV_TIMER_IOCTL_TREAD:
1769 {
1770 int xarg;
1771
1772 down(&tu->tread_sem);
1773 if (tu->timeri) { /* too late */
1774 up(&tu->tread_sem);
1775 return -EBUSY;
1776 }
1777 if (get_user(xarg, p)) {
1778 up(&tu->tread_sem);
1779 return -EFAULT;
1780 }
1781 tu->tread = xarg ? 1 : 0;
1782 up(&tu->tread_sem);
1783 return 0;
1784 }
1785 case SNDRV_TIMER_IOCTL_GINFO:
1786 return snd_timer_user_ginfo(file, argp);
1787 case SNDRV_TIMER_IOCTL_GPARAMS:
1788 return snd_timer_user_gparams(file, argp);
1789 case SNDRV_TIMER_IOCTL_GSTATUS:
1790 return snd_timer_user_gstatus(file, argp);
1791 case SNDRV_TIMER_IOCTL_SELECT:
1792 return snd_timer_user_tselect(file, argp);
1793 case SNDRV_TIMER_IOCTL_INFO:
1794 return snd_timer_user_info(file, argp);
1795 case SNDRV_TIMER_IOCTL_PARAMS:
1796 return snd_timer_user_params(file, argp);
1797 case SNDRV_TIMER_IOCTL_STATUS:
1798 return snd_timer_user_status(file, argp);
1799 case SNDRV_TIMER_IOCTL_START:
1800 case SNDRV_TIMER_IOCTL_START_OLD:
1801 return snd_timer_user_start(file);
1802 case SNDRV_TIMER_IOCTL_STOP:
1803 case SNDRV_TIMER_IOCTL_STOP_OLD:
1804 return snd_timer_user_stop(file);
1805 case SNDRV_TIMER_IOCTL_CONTINUE:
1806 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1807 return snd_timer_user_continue(file);
1808 case SNDRV_TIMER_IOCTL_PAUSE:
1809 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1810 return snd_timer_user_pause(file);
1811 }
1812 return -ENOTTY;
1813 }
1814
1815 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1816 {
1817 struct snd_timer_user *tu;
1818 int err;
1819
1820 tu = file->private_data;
1821 err = fasync_helper(fd, file, on, &tu->fasync);
1822 if (err < 0)
1823 return err;
1824 return 0;
1825 }
1826
1827 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1828 size_t count, loff_t *offset)
1829 {
1830 struct snd_timer_user *tu;
1831 long result = 0, unit;
1832 int err = 0;
1833
1834 tu = file->private_data;
1835 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1836 spin_lock_irq(&tu->qlock);
1837 while ((long)count - result >= unit) {
1838 while (!tu->qused) {
1839 wait_queue_t wait;
1840
1841 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1842 err = -EAGAIN;
1843 break;
1844 }
1845
1846 set_current_state(TASK_INTERRUPTIBLE);
1847 init_waitqueue_entry(&wait, current);
1848 add_wait_queue(&tu->qchange_sleep, &wait);
1849
1850 spin_unlock_irq(&tu->qlock);
1851 schedule();
1852 spin_lock_irq(&tu->qlock);
1853
1854 remove_wait_queue(&tu->qchange_sleep, &wait);
1855
1856 if (signal_pending(current)) {
1857 err = -ERESTARTSYS;
1858 break;
1859 }
1860 }
1861
1862 spin_unlock_irq(&tu->qlock);
1863 if (err < 0)
1864 goto _error;
1865
1866 if (tu->tread) {
1867 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1868 sizeof(struct snd_timer_tread))) {
1869 err = -EFAULT;
1870 goto _error;
1871 }
1872 } else {
1873 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1874 sizeof(struct snd_timer_read))) {
1875 err = -EFAULT;
1876 goto _error;
1877 }
1878 }
1879
1880 tu->qhead %= tu->queue_size;
1881
1882 result += unit;
1883 buffer += unit;
1884
1885 spin_lock_irq(&tu->qlock);
1886 tu->qused--;
1887 }
1888 spin_unlock_irq(&tu->qlock);
1889 _error:
1890 return result > 0 ? result : err;
1891 }
1892
1893 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1894 {
1895 unsigned int mask;
1896 struct snd_timer_user *tu;
1897
1898 tu = file->private_data;
1899
1900 poll_wait(file, &tu->qchange_sleep, wait);
1901
1902 mask = 0;
1903 if (tu->qused)
1904 mask |= POLLIN | POLLRDNORM;
1905
1906 return mask;
1907 }
1908
1909 #ifdef CONFIG_COMPAT
1910 #include "timer_compat.c"
1911 #else
1912 #define snd_timer_user_ioctl_compat NULL
1913 #endif
1914
1915 static struct file_operations snd_timer_f_ops =
1916 {
1917 .owner = THIS_MODULE,
1918 .read = snd_timer_user_read,
1919 .open = snd_timer_user_open,
1920 .release = snd_timer_user_release,
1921 .poll = snd_timer_user_poll,
1922 .unlocked_ioctl = snd_timer_user_ioctl,
1923 .compat_ioctl = snd_timer_user_ioctl_compat,
1924 .fasync = snd_timer_user_fasync,
1925 };
1926
1927 /*
1928 * ENTRY functions
1929 */
1930
1931 static struct snd_info_entry *snd_timer_proc_entry = NULL;
1932
1933 static int __init alsa_timer_init(void)
1934 {
1935 int err;
1936 struct snd_info_entry *entry;
1937
1938 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1939 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1940 "system timer");
1941 #endif
1942 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1943 if (entry != NULL) {
1944 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128;
1945 entry->c.text.read = snd_timer_proc_read;
1946 if (snd_info_register(entry) < 0) {
1947 snd_info_free_entry(entry);
1948 entry = NULL;
1949 }
1950 }
1951 snd_timer_proc_entry = entry;
1952 if ((err = snd_timer_register_system()) < 0)
1953 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1954 err);
1955 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER,
1956 NULL, 0, &snd_timer_f_ops, "timer")) < 0)
1957 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1958 err);
1959 return 0;
1960 }
1961
1962 static void __exit alsa_timer_exit(void)
1963 {
1964 struct list_head *p, *n;
1965
1966 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1967 /* unregister the system timer */
1968 list_for_each_safe(p, n, &snd_timer_list) {
1969 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1970 snd_timer_unregister(timer);
1971 }
1972 if (snd_timer_proc_entry) {
1973 snd_info_unregister(snd_timer_proc_entry);
1974 snd_timer_proc_entry = NULL;
1975 }
1976 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1977 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1978 #endif
1979 }
1980
1981 module_init(alsa_timer_init)
1982 module_exit(alsa_timer_exit)
1983
1984 EXPORT_SYMBOL(snd_timer_open);
1985 EXPORT_SYMBOL(snd_timer_close);
1986 EXPORT_SYMBOL(snd_timer_resolution);
1987 EXPORT_SYMBOL(snd_timer_start);
1988 EXPORT_SYMBOL(snd_timer_stop);
1989 EXPORT_SYMBOL(snd_timer_continue);
1990 EXPORT_SYMBOL(snd_timer_pause);
1991 EXPORT_SYMBOL(snd_timer_new);
1992 EXPORT_SYMBOL(snd_timer_notify);
1993 EXPORT_SYMBOL(snd_timer_global_new);
1994 EXPORT_SYMBOL(snd_timer_global_free);
1995 EXPORT_SYMBOL(snd_timer_global_register);
1996 EXPORT_SYMBOL(snd_timer_global_unregister);
1997 EXPORT_SYMBOL(snd_timer_interrupt);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree