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[PATCH] fix for prune_icache()/forced final iput() races
[deliverable/linux.git] / sound / core / timer.c
CommitLineData
1da177e4
LT		 1/*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <sound/driver.h>
23#include <linux/delay.h>
24#include <linux/init.h>
25#include <linux/smp_lock.h>
26#include <linux/slab.h>
27#include <linux/time.h>
28#include <linux/moduleparam.h>
29#include <sound/core.h>
30#include <sound/timer.h>
31#include <sound/control.h>
32#include <sound/info.h>
33#include <sound/minors.h>
34#include <sound/initval.h>
35#include <linux/kmod.h>
36#ifdef CONFIG_KERNELD
37#include <linux/kerneld.h>
38#endif
39
40#if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
41#define DEFAULT_TIMER_LIMIT 3
42#elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
43#define DEFAULT_TIMER_LIMIT 2
44#else
45#define DEFAULT_TIMER_LIMIT 1
46#endif
47
48static int timer_limit = DEFAULT_TIMER_LIMIT;
49MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>");
50MODULE_DESCRIPTION("ALSA timer interface");
51MODULE_LICENSE("GPL");
52module_param(timer_limit, int, 0444);
53MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
54
55typedef struct {
56 snd_timer_instance_t *timeri;
57 int tread; /* enhanced read with timestamps and events */
58 unsigned long ticks;
59 unsigned long overrun;
60 int qhead;
61 int qtail;
62 int qused;
63 int queue_size;
64 snd_timer_read_t *queue;
65 snd_timer_tread_t *tqueue;
66 spinlock_t qlock;
67 unsigned long last_resolution;
68 unsigned int filter;
69 struct timespec tstamp; /* trigger tstamp */
70 wait_queue_head_t qchange_sleep;
71 struct fasync_struct *fasync;
c1935b4d 72 struct semaphore tread_sem;
1da177e4
LT		 73} snd_timer_user_t;
74
75/* list of timers */
76static LIST_HEAD(snd_timer_list);
77
78/* list of slave instances */
79static LIST_HEAD(snd_timer_slave_list);
80
81/* lock for slave active lists */
82static DEFINE_SPINLOCK(slave_active_lock);
83
84static DECLARE_MUTEX(register_mutex);
85
86static int snd_timer_free(snd_timer_t *timer);
87static int snd_timer_dev_free(snd_device_t *device);
88static int snd_timer_dev_register(snd_device_t *device);
89static int snd_timer_dev_unregister(snd_device_t *device);
90
91static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left);
92
93/*
94 * create a timer instance with the given owner string.
95 * when timer is not NULL, increments the module counter
96 */
97static snd_timer_instance_t *snd_timer_instance_new(char *owner, snd_timer_t *timer)
98{
99 snd_timer_instance_t *timeri;
100 timeri = kcalloc(1, sizeof(*timeri), GFP_KERNEL);
101 if (timeri == NULL)
102 return NULL;
103 timeri->owner = snd_kmalloc_strdup(owner, GFP_KERNEL);
104 if (! timeri->owner) {
105 kfree(timeri);
106 return NULL;
107 }
108 INIT_LIST_HEAD(&timeri->open_list);
109 INIT_LIST_HEAD(&timeri->active_list);
110 INIT_LIST_HEAD(&timeri->ack_list);
111 INIT_LIST_HEAD(&timeri->slave_list_head);
112 INIT_LIST_HEAD(&timeri->slave_active_head);
113
114 timeri->timer = timer;
115 if (timer && timer->card && !try_module_get(timer->card->module)) {
116 kfree(timeri->owner);
117 kfree(timeri);
118 return NULL;
119 }
120
121 return timeri;
122}
123
124/*
125 * find a timer instance from the given timer id
126 */
127static snd_timer_t *snd_timer_find(snd_timer_id_t *tid)
128{
129 snd_timer_t *timer = NULL;
130 struct list_head *p;
131
132 list_for_each(p, &snd_timer_list) {
133 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
134
135 if (timer->tmr_class != tid->dev_class)
136 continue;
137 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
138 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
139 (timer->card == NULL ||
140 timer->card->number != tid->card))
141 continue;
142 if (timer->tmr_device != tid->device)
143 continue;
144 if (timer->tmr_subdevice != tid->subdevice)
145 continue;
146 return timer;
147 }
148 return NULL;
149}
150
151#ifdef CONFIG_KMOD
152
153static void snd_timer_request(snd_timer_id_t *tid)
154{
155 if (! current->fs->root)
156 return;
157 switch (tid->dev_class) {
158 case SNDRV_TIMER_CLASS_GLOBAL:
159 if (tid->device < timer_limit)
160 request_module("snd-timer-%i", tid->device);
161 break;
162 case SNDRV_TIMER_CLASS_CARD:
163 case SNDRV_TIMER_CLASS_PCM:
164 if (tid->card < snd_ecards_limit)
165 request_module("snd-card-%i", tid->card);
166 break;
167 default:
168 break;
169 }
170}
171
172#endif
173
174/*
175 * look for a master instance matching with the slave id of the given slave.
176 * when found, relink the open_link of the slave.
177 *
178 * call this with register_mutex down.
179 */
180static void snd_timer_check_slave(snd_timer_instance_t *slave)
181{
182 snd_timer_t *timer;
183 snd_timer_instance_t *master;
184 struct list_head *p, *q;
185
186 /* FIXME: it's really dumb to look up all entries.. */
187 list_for_each(p, &snd_timer_list) {
188 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
189 list_for_each(q, &timer->open_list_head) {
190 master = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list);
191 if (slave->slave_class == master->slave_class &&
192 slave->slave_id == master->slave_id) {
193 list_del(&slave->open_list);
194 list_add_tail(&slave->open_list, &master->slave_list_head);
195 spin_lock_irq(&slave_active_lock);
196 slave->master = master;
197 slave->timer = master->timer;
198 spin_unlock_irq(&slave_active_lock);
199 return;
200 }
201 }
202 }
203}
204
205/*
206 * look for slave instances matching with the slave id of the given master.
207 * when found, relink the open_link of slaves.
208 *
209 * call this with register_mutex down.
210 */
211static void snd_timer_check_master(snd_timer_instance_t *master)
212{
213 snd_timer_instance_t *slave;
214 struct list_head *p, *n;
215
216 /* check all pending slaves */
217 list_for_each_safe(p, n, &snd_timer_slave_list) {
218 slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
219 if (slave->slave_class == master->slave_class &&
220 slave->slave_id == master->slave_id) {
221 list_del(p);
222 list_add_tail(p, &master->slave_list_head);
223 spin_lock_irq(&slave_active_lock);
224 slave->master = master;
225 slave->timer = master->timer;
226 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
227 list_add_tail(&slave->active_list, &master->slave_active_head);
228 spin_unlock_irq(&slave_active_lock);
229 }
230 }
231}
232
233/*
234 * open a timer instance
235 * when opening a master, the slave id must be here given.
236 */
237int snd_timer_open(snd_timer_instance_t **ti,
238 char *owner, snd_timer_id_t *tid,
239 unsigned int slave_id)
240{
241 snd_timer_t *timer;
242 snd_timer_instance_t *timeri = NULL;
243
244 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
245 /* open a slave instance */
246 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
247 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
248 snd_printd("invalid slave class %i\n", tid->dev_sclass);
249 return -EINVAL;
250 }
251 down(&register_mutex);
252 timeri = snd_timer_instance_new(owner, NULL);
253 timeri->slave_class = tid->dev_sclass;
254 timeri->slave_id = tid->device;
255 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
256 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
257 snd_timer_check_slave(timeri);
258 up(&register_mutex);
259 *ti = timeri;
260 return 0;
261 }
262
263 /* open a master instance */
264 down(&register_mutex);
265 timer = snd_timer_find(tid);
266#ifdef CONFIG_KMOD
267 if (timer == NULL) {
268 up(&register_mutex);
269 snd_timer_request(tid);
270 down(&register_mutex);
271 timer = snd_timer_find(tid);
272 }
273#endif
274 if (timer) {
275 if (!list_empty(&timer->open_list_head)) {
276 timeri = (snd_timer_instance_t *)list_entry(timer->open_list_head.next, snd_timer_instance_t, open_list);
277 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
278 up(&register_mutex);
279 return -EBUSY;
280 }
281 }
282 timeri = snd_timer_instance_new(owner, timer);
283 if (timeri) {
284 timeri->slave_class = tid->dev_sclass;
285 timeri->slave_id = slave_id;
286 if (list_empty(&timer->open_list_head) && timer->hw.open)
287 timer->hw.open(timer);
288 list_add_tail(&timeri->open_list, &timer->open_list_head);
289 snd_timer_check_master(timeri);
290 }
291 } else {
292 up(&register_mutex);
293 return -ENODEV;
294 }
295 up(&register_mutex);
296 *ti = timeri;
297 return 0;
298}
299
300static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event);
301
302/*
303 * close a timer instance
304 */
305int snd_timer_close(snd_timer_instance_t * timeri)
306{
307 snd_timer_t *timer = NULL;
308 struct list_head *p, *n;
309 snd_timer_instance_t *slave;
310
311 snd_assert(timeri != NULL, return -ENXIO);
312
313 /* force to stop the timer */
314 snd_timer_stop(timeri);
315
316 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
317 /* wait, until the active callback is finished */
318 spin_lock_irq(&slave_active_lock);
319 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
320 spin_unlock_irq(&slave_active_lock);
321 udelay(10);
322 spin_lock_irq(&slave_active_lock);
323 }
324 spin_unlock_irq(&slave_active_lock);
325 down(&register_mutex);
326 list_del(&timeri->open_list);
327 up(&register_mutex);
328 } else {
329 timer = timeri->timer;
330 /* wait, until the active callback is finished */
331 spin_lock_irq(&timer->lock);
332 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
333 spin_unlock_irq(&timer->lock);
334 udelay(10);
335 spin_lock_irq(&timer->lock);
336 }
337 spin_unlock_irq(&timer->lock);
338 down(&register_mutex);
339 list_del(&timeri->open_list);
340 if (timer && list_empty(&timer->open_list_head) && timer->hw.close)
341 timer->hw.close(timer);
342 /* remove slave links */
343 list_for_each_safe(p, n, &timeri->slave_list_head) {
344 slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
345 spin_lock_irq(&slave_active_lock);
346 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
347 list_del(p);
348 list_add_tail(p, &snd_timer_slave_list);
349 slave->master = NULL;
350 slave->timer = NULL;
351 spin_unlock_irq(&slave_active_lock);
352 }
353 up(&register_mutex);
354 }
355 if (timeri->private_free)
356 timeri->private_free(timeri);
357 kfree(timeri->owner);
358 kfree(timeri);
359 if (timer && timer->card)
360 module_put(timer->card->module);
361 return 0;
362}
363
364unsigned long snd_timer_resolution(snd_timer_instance_t * timeri)
365{
366 snd_timer_t * timer;
367
368 if (timeri == NULL)
369 return 0;
370 if ((timer = timeri->timer) != NULL) {
371 if (timer->hw.c_resolution)
372 return timer->hw.c_resolution(timer);
373 return timer->hw.resolution;
374 }
375 return 0;
376}
377
378static void snd_timer_notify1(snd_timer_instance_t *ti, enum sndrv_timer_event event)
379{
380 snd_timer_t *timer;
381 unsigned long flags;
382 unsigned long resolution = 0;
383 snd_timer_instance_t *ts;
384 struct list_head *n;
385 struct timespec tstamp;
386
387 snd_timestamp_now(&tstamp, 1);
388 snd_assert(event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE, return);
389 if (event == SNDRV_TIMER_EVENT_START || event == SNDRV_TIMER_EVENT_CONTINUE)
390 resolution = snd_timer_resolution(ti);
391 if (ti->ccallback)
392 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
393 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
394 return;
395 timer = ti->timer;
396 if (timer == NULL)
397 return;
398 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
399 return;
400 spin_lock_irqsave(&timer->lock, flags);
401 list_for_each(n, &ti->slave_active_head) {
402 ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
403 if (ts->ccallback)
404 ts->ccallback(ti, event + 100, &tstamp, resolution);
405 }
406 spin_unlock_irqrestore(&timer->lock, flags);
407}
408
409static int snd_timer_start1(snd_timer_t *timer, snd_timer_instance_t *timeri, unsigned long sticks)
410{
411 list_del(&timeri->active_list);
412 list_add_tail(&timeri->active_list, &timer->active_list_head);
413 if (timer->running) {
414 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
415 goto __start_now;
416 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
417 timeri->flags |= SNDRV_TIMER_IFLG_START;
418 return 1; /* delayed start */
419 } else {
420 timer->sticks = sticks;
421 timer->hw.start(timer);
422 __start_now:
423 timer->running++;
424 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
425 return 0;
426 }
427}
428
429static int snd_timer_start_slave(snd_timer_instance_t *timeri)
430{
431 unsigned long flags;
432
433 spin_lock_irqsave(&slave_active_lock, flags);
434 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
435 if (timeri->master)
436 list_add_tail(&timeri->active_list, &timeri->master->slave_active_head);
437 spin_unlock_irqrestore(&slave_active_lock, flags);
438 return 1; /* delayed start */
439}
440
441/*
442 * start the timer instance
443 */
444int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks)
445{
446 snd_timer_t *timer;
447 int result = -EINVAL;
448 unsigned long flags;
449
450 if (timeri == NULL || ticks < 1)
451 return -EINVAL;
452 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
453 result = snd_timer_start_slave(timeri);
454 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
455 return result;
456 }
457 timer = timeri->timer;
458 if (timer == NULL)
459 return -EINVAL;
460 spin_lock_irqsave(&timer->lock, flags);
461 timeri->ticks = timeri->cticks = ticks;
462 timeri->pticks = 0;
463 result = snd_timer_start1(timer, timeri, ticks);
464 spin_unlock_irqrestore(&timer->lock, flags);
465 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
466 return result;
467}
468
469static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event)
470{
471 snd_timer_t *timer;
472 unsigned long flags;
473
474 snd_assert(timeri != NULL, return -ENXIO);
475
476 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
477 if (!keep_flag) {
478 spin_lock_irqsave(&slave_active_lock, flags);
479 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
480 spin_unlock_irqrestore(&slave_active_lock, flags);
481 }
482 goto __end;
483 }
484 timer = timeri->timer;
485 if (!timer)
486 return -EINVAL;
487 spin_lock_irqsave(&timer->lock, flags);
488 list_del_init(&timeri->ack_list);
489 list_del_init(&timeri->active_list);
490 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
491 !(--timer->running)) {
492 timer->hw.stop(timer);
493 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
494 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
495 snd_timer_reschedule(timer, 0);
496 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
497 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
498 timer->hw.start(timer);
499 }
500 }
501 }
502 if (!keep_flag)
503 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING|SNDRV_TIMER_IFLG_START);
504 spin_unlock_irqrestore(&timer->lock, flags);
505 __end:
506 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
507 snd_timer_notify1(timeri, event);
508 return 0;
509}
510
511/*
512 * stop the timer instance.
513 *
514 * do not call this from the timer callback!
515 */
516int snd_timer_stop(snd_timer_instance_t * timeri)
517{
518 snd_timer_t *timer;
519 unsigned long flags;
520 int err;
521
522 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
523 if (err < 0)
524 return err;
525 timer = timeri->timer;
526 spin_lock_irqsave(&timer->lock, flags);
527 timeri->cticks = timeri->ticks;
528 timeri->pticks = 0;
529 spin_unlock_irqrestore(&timer->lock, flags);
530 return 0;
531}
532
533/*
534 * start again.. the tick is kept.
535 */
536int snd_timer_continue(snd_timer_instance_t * timeri)
537{
538 snd_timer_t *timer;
539 int result = -EINVAL;
540 unsigned long flags;
541
542 if (timeri == NULL)
543 return result;
544 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
545 return snd_timer_start_slave(timeri);
546 timer = timeri->timer;
547 if (! timer)
548 return -EINVAL;
549 spin_lock_irqsave(&timer->lock, flags);
550 if (!timeri->cticks)
551 timeri->cticks = 1;
552 timeri->pticks = 0;
553 result = snd_timer_start1(timer, timeri, timer->sticks);
554 spin_unlock_irqrestore(&timer->lock, flags);
555 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
556 return result;
557}
558
559/*
560 * pause.. remember the ticks left
561 */
562int snd_timer_pause(snd_timer_instance_t * timeri)
563{
564 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
565}
566
567/*
568 * reschedule the timer
569 *
570 * start pending instances and check the scheduling ticks.
571 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
572 */
573static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left)
574{
575 snd_timer_instance_t *ti;
576 unsigned long ticks = ~0UL;
577 struct list_head *p;
578
579 list_for_each(p, &timer->active_list_head) {
580 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
581 if (ti->flags & SNDRV_TIMER_IFLG_START) {
582 ti->flags &= ~SNDRV_TIMER_IFLG_START;
583 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
584 timer->running++;
585 }
586 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
587 if (ticks > ti->cticks)
588 ticks = ti->cticks;
589 }
590 }
591 if (ticks == ~0UL) {
592 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
593 return;
594 }
595 if (ticks > timer->hw.ticks)
596 ticks = timer->hw.ticks;
597 if (ticks_left != ticks)
598 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
599 timer->sticks = ticks;
600}
601
602/*
603 * timer tasklet
604 *
605 */
606static void snd_timer_tasklet(unsigned long arg)
607{
608 snd_timer_t *timer = (snd_timer_t *) arg;
609 snd_timer_instance_t *ti;
610 struct list_head *p;
611 unsigned long resolution, ticks;
612
613 spin_lock(&timer->lock);
614 /* now process all callbacks */
615 while (!list_empty(&timer->sack_list_head)) {
616 p = timer->sack_list_head.next; /* get first item */
617 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
618
619 /* remove from ack_list and make empty */
620 list_del_init(p);
621
622 ticks = ti->pticks;
623 ti->pticks = 0;
624 resolution = ti->resolution;
625
626 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
627 spin_unlock(&timer->lock);
628 if (ti->callback)
629 ti->callback(ti, resolution, ticks);
630 spin_lock(&timer->lock);
631 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
632 }
633 spin_unlock(&timer->lock);
634}
635
636/*
637 * timer interrupt
638 *
639 * ticks_left is usually equal to timer->sticks.
640 *
641 */
642void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left)
643{
644 snd_timer_instance_t *ti, *ts;
645 unsigned long resolution, ticks;
646 struct list_head *p, *q, *n;
647 int use_tasklet = 0;
648
649 if (timer == NULL)
650 return;
651
652 spin_lock(&timer->lock);
653
654 /* remember the current resolution */
655 if (timer->hw.c_resolution)
656 resolution = timer->hw.c_resolution(timer);
657 else
658 resolution = timer->hw.resolution;
659
660 /* loop for all active instances
661 * here we cannot use list_for_each because the active_list of a processed
662 * instance is relinked to done_list_head before callback is called.
663 */
664 list_for_each_safe(p, n, &timer->active_list_head) {
665 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
666 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
667 continue;
668 ti->pticks += ticks_left;
669 ti->resolution = resolution;
670 if (ti->cticks < ticks_left)
671 ti->cticks = 0;
672 else
673 ti->cticks -= ticks_left;
674 if (ti->cticks) /* not expired */
675 continue;
676 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
677 ti->cticks = ti->ticks;
678 } else {
679 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
680 if (--timer->running)
681 list_del(p);
682 }
683 if (list_empty(&ti->ack_list)) {
684 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
685 (ti->flags & SNDRV_TIMER_IFLG_FAST)) {
686 list_add_tail(&ti->ack_list, &timer->ack_list_head);
687 } else {
688 list_add_tail(&ti->ack_list, &timer->sack_list_head);
689 }
690 }
691 list_for_each(q, &ti->slave_active_head) {
692 ts = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, active_list);
693 ts->pticks = ti->pticks;
694 ts->resolution = resolution;
695 if (list_empty(&ts->ack_list)) {
696 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
697 (ti->flags & SNDRV_TIMER_IFLG_FAST)) {
698 list_add_tail(&ts->ack_list, &timer->ack_list_head);
699 } else {
700 list_add_tail(&ts->ack_list, &timer->sack_list_head);
701 }
702 }
703 }
704 }
705 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
706 snd_timer_reschedule(timer, ticks_left);
707 if (timer->running) {
708 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
709 timer->hw.stop(timer);
710 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
711 }
712 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
713 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
714 /* restart timer */
715 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
716 timer->hw.start(timer);
717 }
718 } else {
719 timer->hw.stop(timer);
720 }
721
722 /* now process all fast callbacks */
723 while (!list_empty(&timer->ack_list_head)) {
724 p = timer->ack_list_head.next; /* get first item */
725 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
726
727 /* remove from ack_list and make empty */
728 list_del_init(p);
729
730 ticks = ti->pticks;
731 ti->pticks = 0;
732
733 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
734 spin_unlock(&timer->lock);
735 if (ti->callback)
736 ti->callback(ti, resolution, ticks);
737 spin_lock(&timer->lock);
738 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
739 }
740
741 /* do we have any slow callbacks? */
742 use_tasklet = !list_empty(&timer->sack_list_head);
743 spin_unlock(&timer->lock);
744
745 if (use_tasklet)
746 tasklet_hi_schedule(&timer->task_queue);
747}
748
749/*
750
751 */
752
753int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t ** rtimer)
754{
755 snd_timer_t *timer;
756 int err;
757 static snd_device_ops_t ops = {
758 .dev_free = snd_timer_dev_free,
759 .dev_register = snd_timer_dev_register,
760 .dev_unregister = snd_timer_dev_unregister
761 };
762
763 snd_assert(tid != NULL, return -EINVAL);
764 snd_assert(rtimer != NULL, return -EINVAL);
765 *rtimer = NULL;
766 timer = kcalloc(1, sizeof(*timer), GFP_KERNEL);
767 if (timer == NULL)
768 return -ENOMEM;
769 timer->tmr_class = tid->dev_class;
770 timer->card = card;
771 timer->tmr_device = tid->device;
772 timer->tmr_subdevice = tid->subdevice;
773 if (id)
774 strlcpy(timer->id, id, sizeof(timer->id));
775 INIT_LIST_HEAD(&timer->device_list);
776 INIT_LIST_HEAD(&timer->open_list_head);
777 INIT_LIST_HEAD(&timer->active_list_head);
778 INIT_LIST_HEAD(&timer->ack_list_head);
779 INIT_LIST_HEAD(&timer->sack_list_head);
780 spin_lock_init(&timer->lock);
781 tasklet_init(&timer->task_queue, snd_timer_tasklet, (unsigned long)timer);
782 if (card != NULL) {
783 if ((err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops)) < 0) {
784 snd_timer_free(timer);
785 return err;
786 }
787 }
788 *rtimer = timer;
789 return 0;
790}
791
792static int snd_timer_free(snd_timer_t *timer)
793{
794 snd_assert(timer != NULL, return -ENXIO);
795 if (timer->private_free)
796 timer->private_free(timer);
797 kfree(timer);
798 return 0;
799}
800
801int snd_timer_dev_free(snd_device_t *device)
802{
803 snd_timer_t *timer = device->device_data;
804 return snd_timer_free(timer);
805}
806
807int snd_timer_dev_register(snd_device_t *dev)
808{
809 snd_timer_t *timer = dev->device_data;
810 snd_timer_t *timer1;
811 struct list_head *p;
812
813 snd_assert(timer != NULL && timer->hw.start != NULL && timer->hw.stop != NULL, return -ENXIO);
814 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
815 !timer->hw.resolution && timer->hw.c_resolution == NULL)
816 return -EINVAL;
817
818 down(&register_mutex);
819 list_for_each(p, &snd_timer_list) {
820 timer1 = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
821 if (timer1->tmr_class > timer->tmr_class)
822 break;
823 if (timer1->tmr_class < timer->tmr_class)
824 continue;
825 if (timer1->card && timer->card) {
826 if (timer1->card->number > timer->card->number)
827 break;
828 if (timer1->card->number < timer->card->number)
829 continue;
830 }
831 if (timer1->tmr_device > timer->tmr_device)
832 break;
833 if (timer1->tmr_device < timer->tmr_device)
834 continue;
835 if (timer1->tmr_subdevice > timer->tmr_subdevice)
836 break;
837 if (timer1->tmr_subdevice < timer->tmr_subdevice)
838 continue;
839 /* conflicts.. */
840 up(&register_mutex);
841 return -EBUSY;
842 }
843 list_add_tail(&timer->device_list, p);
844 up(&register_mutex);
845 return 0;
846}
847
123992f7 848static int snd_timer_unregister(snd_timer_t *timer)
1da177e4
LT		 849{
850 struct list_head *p, *n;
851 snd_timer_instance_t *ti;
852
853 snd_assert(timer != NULL, return -ENXIO);
854 down(&register_mutex);
855 if (! list_empty(&timer->open_list_head)) {
856 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer);
857 list_for_each_safe(p, n, &timer->open_list_head) {
858 list_del_init(p);
859 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
860 ti->timer = NULL;
861 }
862 }
863 list_del(&timer->device_list);
864 up(&register_mutex);
865 return snd_timer_free(timer);
866}
867
868static int snd_timer_dev_unregister(snd_device_t *device)
869{
870 snd_timer_t *timer = device->device_data;
871 return snd_timer_unregister(timer);
872}
873
874void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, struct timespec *tstamp)
875{
876 unsigned long flags;
877 unsigned long resolution = 0;
878 snd_timer_instance_t *ti, *ts;
879 struct list_head *p, *n;
880
881 snd_runtime_check(timer->hw.flags & SNDRV_TIMER_HW_SLAVE, return);
882 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && event <= SNDRV_TIMER_EVENT_MPAUSE, return);
883 spin_lock_irqsave(&timer->lock, flags);
884 if (event == SNDRV_TIMER_EVENT_MSTART || event == SNDRV_TIMER_EVENT_MCONTINUE) {
885 if (timer->hw.c_resolution)
886 resolution = timer->hw.c_resolution(timer);
887 else
888 resolution = timer->hw.resolution;
889 }
890 list_for_each(p, &timer->active_list_head) {
891 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
892 if (ti->ccallback)
893 ti->ccallback(ti, event, tstamp, resolution);
894 list_for_each(n, &ti->slave_active_head) {
895 ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
896 if (ts->ccallback)
897 ts->ccallback(ts, event, tstamp, resolution);
898 }
899 }
900 spin_unlock_irqrestore(&timer->lock, flags);
901}
902
903/*
904 * exported functions for global timers
905 */
906int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer)
907{
908 snd_timer_id_t tid;
909
910 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
911 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
912 tid.card = -1;
913 tid.device = device;
914 tid.subdevice = 0;
915 return snd_timer_new(NULL, id, &tid, rtimer);
916}
917
918int snd_timer_global_free(snd_timer_t *timer)
919{
920 return snd_timer_free(timer);
921}
922
923int snd_timer_global_register(snd_timer_t *timer)
924{
925 snd_device_t dev;
926
927 memset(&dev, 0, sizeof(dev));
928 dev.device_data = timer;
929 return snd_timer_dev_register(&dev);
930}
931
932int snd_timer_global_unregister(snd_timer_t *timer)
933{
934 return snd_timer_unregister(timer);
935}
936
937/*
938 * System timer
939 */
940
941struct snd_timer_system_private {
942 struct timer_list tlist;
943 struct timer * timer;
944 unsigned long last_expires;
945 unsigned long last_jiffies;
946 unsigned long correction;
947};
948
1da177e4
LT		 949static void snd_timer_s_function(unsigned long data)
950{
951 snd_timer_t *timer = (snd_timer_t *)data;
952 struct snd_timer_system_private *priv = timer->private_data;
953 unsigned long jiff = jiffies;
954 if (time_after(jiff, priv->last_expires))
955 priv->correction = (long)jiff - (long)priv->last_expires;
956 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
957}
958
959static int snd_timer_s_start(snd_timer_t * timer)
960{
961 struct snd_timer_system_private *priv;
962 unsigned long njiff;
963
964 priv = (struct snd_timer_system_private *) timer->private_data;
965 njiff = (priv->last_jiffies = jiffies);
966 if (priv->correction > timer->sticks - 1) {
967 priv->correction -= timer->sticks - 1;
968 njiff++;
969 } else {
970 njiff += timer->sticks - priv->correction;
971 priv->correction -= timer->sticks;
972 }
973 priv->last_expires = priv->tlist.expires = njiff;
974 add_timer(&priv->tlist);
975 return 0;
976}
977
978static int snd_timer_s_stop(snd_timer_t * timer)
979{
980 struct snd_timer_system_private *priv;
981 unsigned long jiff;
982
983 priv = (struct snd_timer_system_private *) timer->private_data;
984 del_timer(&priv->tlist);
985 jiff = jiffies;
986 if (time_before(jiff, priv->last_expires))
987 timer->sticks = priv->last_expires - jiff;
988 else
989 timer->sticks = 1;
990 return 0;
991}
992
993static struct _snd_timer_hardware snd_timer_system =
994{
995 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
996 .resolution = 1000000000L / HZ,
997 .ticks = 10000000L,
998 .start = snd_timer_s_start,
999 .stop = snd_timer_s_stop
1000};
1001
1002static void snd_timer_free_system(snd_timer_t *timer)
1003{
1004 kfree(timer->private_data);
1005}
1006
1007static int snd_timer_register_system(void)
1008{
1009 snd_timer_t *timer;
1010 struct snd_timer_system_private *priv;
1011 int err;
1012
1013 if ((err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer)) < 0)
1014 return err;
1015 strcpy(timer->name, "system timer");
1016 timer->hw = snd_timer_system;
1017 priv = kcalloc(1, sizeof(*priv), GFP_KERNEL);
1018 if (priv == NULL) {
1019 snd_timer_free(timer);
1020 return -ENOMEM;
1021 }
1022 init_timer(&priv->tlist);
1023 priv->tlist.function = snd_timer_s_function;
1024 priv->tlist.data = (unsigned long) timer;
1025 timer->private_data = priv;
1026 timer->private_free = snd_timer_free_system;
1027 return snd_timer_global_register(timer);
1028}
1029
1030/*
1031 * Info interface
1032 */
1033
1034static void snd_timer_proc_read(snd_info_entry_t *entry,
1035 snd_info_buffer_t * buffer)
1036{
1037 unsigned long flags;
1038 snd_timer_t *timer;
1039 snd_timer_instance_t *ti;
1040 struct list_head *p, *q;
1041
1042 down(&register_mutex);
1043 list_for_each(p, &snd_timer_list) {
1044 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1045 switch (timer->tmr_class) {
1046 case SNDRV_TIMER_CLASS_GLOBAL:
1047 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1048 break;
1049 case SNDRV_TIMER_CLASS_CARD:
1050 snd_iprintf(buffer, "C%i-%i: ", timer->card->number, timer->tmr_device);
1051 break;
1052 case SNDRV_TIMER_CLASS_PCM:
1053 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, timer->tmr_device, timer->tmr_subdevice);
1054 break;
1055 default:
1056 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, timer->card ? timer->card->number : -1, timer->tmr_device, timer->tmr_subdevice);
1057 }
1058 snd_iprintf(buffer, "%s :", timer->name);
1059 if (timer->hw.resolution)
1060 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", timer->hw.resolution / 1000, timer->hw.resolution % 1000, timer->hw.ticks);
1061 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1062 snd_iprintf(buffer, " SLAVE");
1063 snd_iprintf(buffer, "\n");
1064 spin_lock_irqsave(&timer->lock, flags);
1065 list_for_each(q, &timer->open_list_head) {
1066 ti = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list);
1067 snd_iprintf(buffer, " Client %s : %s : lost interrupts %li\n",
1068 ti->owner ? ti->owner : "unknown",
1069 ti->flags & (SNDRV_TIMER_IFLG_START|SNDRV_TIMER_IFLG_RUNNING) ? "running" : "stopped",
1070 ti->lost);
1071 }
1072 spin_unlock_irqrestore(&timer->lock, flags);
1073 }
1074 up(&register_mutex);
1075}
1076
1077/*
1078 * USER SPACE interface
1079 */
1080
1081static void snd_timer_user_interrupt(snd_timer_instance_t *timeri,
1082 unsigned long resolution,
1083 unsigned long ticks)
1084{
1085 snd_timer_user_t *tu = timeri->callback_data;
1086 snd_timer_read_t *r;
1087 int prev;
1088
1089 spin_lock(&tu->qlock);
1090 if (tu->qused > 0) {
1091 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1092 r = &tu->queue[prev];
1093 if (r->resolution == resolution) {
1094 r->ticks += ticks;
1095 goto __wake;
1096 }
1097 }
1098 if (tu->qused >= tu->queue_size) {
1099 tu->overrun++;
1100 } else {
1101 r = &tu->queue[tu->qtail++];
1102 tu->qtail %= tu->queue_size;
1103 r->resolution = resolution;
1104 r->ticks = ticks;
1105 tu->qused++;
1106 }
1107 __wake:
1108 spin_unlock(&tu->qlock);
1109 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1110 wake_up(&tu->qchange_sleep);
1111}
1112
1113static void snd_timer_user_append_to_tqueue(snd_timer_user_t *tu, snd_timer_tread_t *tread)
1114{
1115 if (tu->qused >= tu->queue_size) {
1116 tu->overrun++;
1117 } else {
1118 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1119 tu->qtail %= tu->queue_size;
1120 tu->qused++;
1121 }
1122}
1123
1124static void snd_timer_user_ccallback(snd_timer_instance_t *timeri,
1125 enum sndrv_timer_event event,
1126 struct timespec *tstamp,
1127 unsigned long resolution)
1128{
1129 snd_timer_user_t *tu = timeri->callback_data;
1130 snd_timer_tread_t r1;
1131
1132 if (event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE)
1133 tu->tstamp = *tstamp;
1134 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1135 return;
1136 r1.event = event;
1137 r1.tstamp = *tstamp;
1138 r1.val = resolution;
1139 spin_lock(&tu->qlock);
1140 snd_timer_user_append_to_tqueue(tu, &r1);
1141 spin_unlock(&tu->qlock);
1142 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1143 wake_up(&tu->qchange_sleep);
1144}
1145
1146static void snd_timer_user_tinterrupt(snd_timer_instance_t *timeri,
1147 unsigned long resolution,
1148 unsigned long ticks)
1149{
1150 snd_timer_user_t *tu = timeri->callback_data;
1151 snd_timer_tread_t *r, r1;
1152 struct timespec tstamp;
1153 int prev, append = 0;
1154
1155 snd_timestamp_zero(&tstamp);
1156 spin_lock(&tu->qlock);
1157 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION)|(1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1158 spin_unlock(&tu->qlock);
1159 return;
1160 }
1161 if (tu->last_resolution != resolution || ticks > 0)
1162 snd_timestamp_now(&tstamp, 1);
1163 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && tu->last_resolution != resolution) {
1164 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1165 r1.tstamp = tstamp;
1166 r1.val = resolution;
1167 snd_timer_user_append_to_tqueue(tu, &r1);
1168 tu->last_resolution = resolution;
1169 append++;
1170 }
1171 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1172 goto __wake;
1173 if (ticks == 0)
1174 goto __wake;
1175 if (tu->qused > 0) {
1176 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1177 r = &tu->tqueue[prev];
1178 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1179 r->tstamp = tstamp;
1180 r->val += ticks;
1181 append++;
1182 goto __wake;
1183 }
1184 }
1185 r1.event = SNDRV_TIMER_EVENT_TICK;
1186 r1.tstamp = tstamp;
1187 r1.val = ticks;
1188 snd_timer_user_append_to_tqueue(tu, &r1);
1189 append++;
1190 __wake:
1191 spin_unlock(&tu->qlock);
1192 if (append == 0)
1193 return;
1194 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1195 wake_up(&tu->qchange_sleep);
1196}
1197
1198static int snd_timer_user_open(struct inode *inode, struct file *file)
1199{
1200 snd_timer_user_t *tu;
1201
1202 tu = kcalloc(1, sizeof(*tu), GFP_KERNEL);
1203 if (tu == NULL)
1204 return -ENOMEM;
1205 spin_lock_init(&tu->qlock);
1206 init_waitqueue_head(&tu->qchange_sleep);
c1935b4d 1207 init_MUTEX(&tu->tread_sem);
1da177e4
LT		 1208 tu->ticks = 1;
1209 tu->queue_size = 128;
1210 tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1211 if (tu->queue == NULL) {
1212 kfree(tu);
1213 return -ENOMEM;
1214 }
1215 file->private_data = tu;
1216 return 0;
1217}
1218
1219static int snd_timer_user_release(struct inode *inode, struct file *file)
1220{
1221 snd_timer_user_t *tu;
1222
1223 if (file->private_data) {
1224 tu = file->private_data;
1225 file->private_data = NULL;
1226 fasync_helper(-1, file, 0, &tu->fasync);
1227 if (tu->timeri)
1228 snd_timer_close(tu->timeri);
1229 kfree(tu->queue);
1230 kfree(tu->tqueue);
1231 kfree(tu);
1232 }
1233 return 0;
1234}
1235
1236static void snd_timer_user_zero_id(snd_timer_id_t *id)
1237{
1238 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1239 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1240 id->card = -1;
1241 id->device = -1;
1242 id->subdevice = -1;
1243}
1244
1245static void snd_timer_user_copy_id(snd_timer_id_t *id, snd_timer_t *timer)
1246{
1247 id->dev_class = timer->tmr_class;
1248 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1249 id->card = timer->card ? timer->card->number : -1;
1250 id->device = timer->tmr_device;
1251 id->subdevice = timer->tmr_subdevice;
1252}
1253
1254static int snd_timer_user_next_device(snd_timer_id_t __user *_tid)
1255{
1256 snd_timer_id_t id;
1257 snd_timer_t *timer;
1258 struct list_head *p;
1259
1260 if (copy_from_user(&id, _tid, sizeof(id)))
1261 return -EFAULT;
1262 down(&register_mutex);
1263 if (id.dev_class < 0) { /* first item */
1264 if (list_empty(&snd_timer_list))
1265 snd_timer_user_zero_id(&id);
1266 else {
1267 timer = (snd_timer_t *)list_entry(snd_timer_list.next, snd_timer_t, device_list);
1268 snd_timer_user_copy_id(&id, timer);
1269 }
1270 } else {
1271 switch (id.dev_class) {
1272 case SNDRV_TIMER_CLASS_GLOBAL:
1273 id.device = id.device < 0 ? 0 : id.device + 1;
1274 list_for_each(p, &snd_timer_list) {
1275 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1276 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1277 snd_timer_user_copy_id(&id, timer);
1278 break;
1279 }
1280 if (timer->tmr_device >= id.device) {
1281 snd_timer_user_copy_id(&id, timer);
1282 break;
1283 }
1284 }
1285 if (p == &snd_timer_list)
1286 snd_timer_user_zero_id(&id);
1287 break;
1288 case SNDRV_TIMER_CLASS_CARD:
1289 case SNDRV_TIMER_CLASS_PCM:
1290 if (id.card < 0) {
1291 id.card = 0;
1292 } else {
1293 if (id.card < 0) {
1294 id.card = 0;
1295 } else {
1296 if (id.device < 0) {
1297 id.device = 0;
1298 } else {
1299 id.subdevice = id.subdevice < 0 ? 0 : id.subdevice + 1;
1300 }
1301 }
1302 }
1303 list_for_each(p, &snd_timer_list) {
1304 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1305 if (timer->tmr_class > id.dev_class) {
1306 snd_timer_user_copy_id(&id, timer);
1307 break;
1308 }
1309 if (timer->tmr_class < id.dev_class)
1310 continue;
1311 if (timer->card->number > id.card) {
1312 snd_timer_user_copy_id(&id, timer);
1313 break;
1314 }
1315 if (timer->card->number < id.card)
1316 continue;
1317 if (timer->tmr_device > id.device) {
1318 snd_timer_user_copy_id(&id, timer);
1319 break;
1320 }
1321 if (timer->tmr_device < id.device)
1322 continue;
1323 if (timer->tmr_subdevice > id.subdevice) {
1324 snd_timer_user_copy_id(&id, timer);
1325 break;
1326 }
1327 if (timer->tmr_subdevice < id.subdevice)
1328 continue;
1329 snd_timer_user_copy_id(&id, timer);
1330 break;
1331 }
1332 if (p == &snd_timer_list)
1333 snd_timer_user_zero_id(&id);
1334 break;
1335 default:
1336 snd_timer_user_zero_id(&id);
1337 }
1338 }
1339 up(&register_mutex);
1340 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1341 return -EFAULT;
1342 return 0;
1343}
1344
1345static int snd_timer_user_ginfo(struct file *file, snd_timer_ginfo_t __user *_ginfo)
1346{
1347 snd_timer_ginfo_t *ginfo;
1348 snd_timer_id_t tid;
1349 snd_timer_t *t;
1350 struct list_head *p;
1351 int err = 0;
1352
1353 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1354 if (! ginfo)
1355 return -ENOMEM;
1356 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1357 kfree(ginfo);
1358 return -EFAULT;
1359 }
1360 tid = ginfo->tid;
1361 memset(ginfo, 0, sizeof(*ginfo));
1362 ginfo->tid = tid;
1363 down(&register_mutex);
1364 t = snd_timer_find(&tid);
1365 if (t != NULL) {
1366 ginfo->card = t->card ? t->card->number : -1;
1367 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1368 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1369 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1370 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1371 ginfo->resolution = t->hw.resolution;
1372 if (t->hw.resolution_min > 0) {
1373 ginfo->resolution_min = t->hw.resolution_min;
1374 ginfo->resolution_max = t->hw.resolution_max;
1375 }
1376 list_for_each(p, &t->open_list_head) {
1377 ginfo->clients++;
1378 }
1379 } else {
1380 err = -ENODEV;
1381 }
1382 up(&register_mutex);
1383 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1384 err = -EFAULT;
1385 kfree(ginfo);
1386 return err;
1387}
1388
1389static int snd_timer_user_gparams(struct file *file, snd_timer_gparams_t __user *_gparams)
1390{
1391 snd_timer_gparams_t gparams;
1392 snd_timer_t *t;
1393 int err;
1394
1395 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1396 return -EFAULT;
1397 down(&register_mutex);
1398 t = snd_timer_find(&gparams.tid);
1399 if (t != NULL) {
1400 if (list_empty(&t->open_list_head)) {
1401 if (t->hw.set_period)
1402 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1403 else
1404 err = -ENOSYS;
1405 } else {
1406 err = -EBUSY;
1407 }
1408 } else {
1409 err = -ENODEV;
1410 }
1411 up(&register_mutex);
1412 return err;
1413}
1414
1415static int snd_timer_user_gstatus(struct file *file, snd_timer_gstatus_t __user *_gstatus)
1416{
1417 snd_timer_gstatus_t gstatus;
1418 snd_timer_id_t tid;
1419 snd_timer_t *t;
1420 int err = 0;
1421
1422 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1423 return -EFAULT;
1424 tid = gstatus.tid;
1425 memset(&gstatus, 0, sizeof(gstatus));
1426 gstatus.tid = tid;
1427 down(&register_mutex);
1428 t = snd_timer_find(&tid);
1429 if (t != NULL) {
1430 if (t->hw.c_resolution)
1431 gstatus.resolution = t->hw.c_resolution(t);
1432 else
1433 gstatus.resolution = t->hw.resolution;
1434 if (t->hw.precise_resolution) {
1435 t->hw.precise_resolution(t, &gstatus.resolution_num, &gstatus.resolution_den);
1436 } else {
1437 gstatus.resolution_num = gstatus.resolution;
1438 gstatus.resolution_den = 1000000000uL;
1439 }
1440 } else {
1441 err = -ENODEV;
1442 }
1443 up(&register_mutex);
1444 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1445 err = -EFAULT;
1446 return err;
1447}
1448
1449static int snd_timer_user_tselect(struct file *file, snd_timer_select_t __user *_tselect)
1450{
1451 snd_timer_user_t *tu;
1452 snd_timer_select_t tselect;
1453 char str[32];
c1935b4d 1454 int err = 0;
1da177e4
LT		 1455
1456 tu = file->private_data;
c1935b4d
JK		 1457 down(&tu->tread_sem);
1458 if (tu->timeri) {
1da177e4 1459 snd_timer_close(tu->timeri);
c1935b4d
JK		 1460 tu->timeri = NULL;
1461 }
1462 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1463 err = -EFAULT;
1464 goto __err;
1465 }
1da177e4
LT		 1466 sprintf(str, "application %i", current->pid);
1467 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1468 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1469 if ((err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid)) < 0)
c1935b4d 1470 goto __err;
1da177e4 1471
4d572776
JJ		 1472 kfree(tu->queue);
1473 tu->queue = NULL;
1474 kfree(tu->tqueue);
1475 tu->tqueue = NULL;
1da177e4
LT		 1476 if (tu->tread) {
1477 tu->tqueue = (snd_timer_tread_t *)kmalloc(tu->queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
c1935b4d
JK		 1478 if (tu->tqueue == NULL)
1479 err = -ENOMEM;
1da177e4
LT		 1480 } else {
1481 tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
c1935b4d
JK		 1482 if (tu->queue == NULL)
1483 err = -ENOMEM;
1da177e4
LT		 1484 }
1485
c1935b4d
JK		 1486 if (err < 0) {
1487 snd_timer_close(tu->timeri);
1488 tu->timeri = NULL;
1489 } else {
1490 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1491 tu->timeri->callback = tu->tread ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1492 tu->timeri->ccallback = snd_timer_user_ccallback;
1493 tu->timeri->callback_data = (void *)tu;
1494 }
1495
1496 __err:
1497 up(&tu->tread_sem);
1498 return err;
1da177e4
LT		 1499}
1500
1501static int snd_timer_user_info(struct file *file, snd_timer_info_t __user *_info)
1502{
1503 snd_timer_user_t *tu;
1504 snd_timer_info_t *info;
1505 snd_timer_t *t;
1506 int err = 0;
1507
1508 tu = file->private_data;
1509 snd_assert(tu->timeri != NULL, return -ENXIO);
1510 t = tu->timeri->timer;
1511 snd_assert(t != NULL, return -ENXIO);
1512
1513 info = kcalloc(1, sizeof(*info), GFP_KERNEL);
1514 if (! info)
1515 return -ENOMEM;
1516 info->card = t->card ? t->card->number : -1;
1517 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1518 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1519 strlcpy(info->id, t->id, sizeof(info->id));
1520 strlcpy(info->name, t->name, sizeof(info->name));
1521 info->resolution = t->hw.resolution;
1522 if (copy_to_user(_info, info, sizeof(*_info)))
1523 err = -EFAULT;
1524 kfree(info);
1525 return err;
1526}
1527
1528static int snd_timer_user_params(struct file *file, snd_timer_params_t __user *_params)
1529{
1530 snd_timer_user_t *tu;
1531 snd_timer_params_t params;
1532 snd_timer_t *t;
1533 snd_timer_read_t *tr;
1534 snd_timer_tread_t *ttr;
1535 int err;
1536
1537 tu = file->private_data;
1538 snd_assert(tu->timeri != NULL, return -ENXIO);
1539 t = tu->timeri->timer;
1540 snd_assert(t != NULL, return -ENXIO);
1541 if (copy_from_user(&params, _params, sizeof(params)))
1542 return -EFAULT;
1543 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1544 err = -EINVAL;
1545 goto _end;
1546 }
1547 if (params.queue_size > 0 && (params.queue_size < 32 || params.queue_size > 1024)) {
1548 err = -EINVAL;
1549 goto _end;
1550 }
1551 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1552 (1<<SNDRV_TIMER_EVENT_TICK)|
1553 (1<<SNDRV_TIMER_EVENT_START)|
1554 (1<<SNDRV_TIMER_EVENT_STOP)|
1555 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1556 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1557 (1<<SNDRV_TIMER_EVENT_MSTART)|
1558 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1559 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1560 (1<<SNDRV_TIMER_EVENT_MPAUSE))) {
1561 err = -EINVAL;
1562 goto _end;
1563 }
1564 snd_timer_stop(tu->timeri);
1565 spin_lock_irq(&t->lock);
1566 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1567 SNDRV_TIMER_IFLG_EXCLUSIVE|
1568 SNDRV_TIMER_IFLG_EARLY_EVENT);
1569 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1570 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1571 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1572 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1573 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1574 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1575 spin_unlock_irq(&t->lock);
1576 if (params.queue_size > 0 && (unsigned int)tu->queue_size != params.queue_size) {
1577 if (tu->tread) {
1578 ttr = (snd_timer_tread_t *)kmalloc(params.queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
1579 if (ttr) {
1580 kfree(tu->tqueue);
1581 tu->queue_size = params.queue_size;
1582 tu->tqueue = ttr;
1583 }
1584 } else {
1585 tr = (snd_timer_read_t *)kmalloc(params.queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1586 if (tr) {
1587 kfree(tu->queue);
1588 tu->queue_size = params.queue_size;
1589 tu->queue = tr;
1590 }
1591 }
1592 }
1593 tu->qhead = tu->qtail = tu->qused = 0;
1594 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1595 if (tu->tread) {
1596 snd_timer_tread_t tread;
1597 tread.event = SNDRV_TIMER_EVENT_EARLY;
1598 tread.tstamp.tv_sec = 0;
1599 tread.tstamp.tv_nsec = 0;
1600 tread.val = 0;
1601 snd_timer_user_append_to_tqueue(tu, &tread);
1602 } else {
1603 snd_timer_read_t *r = &tu->queue[0];
1604 r->resolution = 0;
1605 r->ticks = 0;
1606 tu->qused++;
1607 tu->qtail++;
1608 }
1609
1610 }
1611 tu->filter = params.filter;
1612 tu->ticks = params.ticks;
1613 err = 0;
1614 _end:
1615 if (copy_to_user(_params, &params, sizeof(params)))
1616 return -EFAULT;
1617 return err;
1618}
1619
1620static int snd_timer_user_status(struct file *file, snd_timer_status_t __user *_status)
1621{
1622 snd_timer_user_t *tu;
1623 snd_timer_status_t status;
1624
1625 tu = file->private_data;
1626 snd_assert(tu->timeri != NULL, return -ENXIO);
1627 memset(&status, 0, sizeof(status));
1628 status.tstamp = tu->tstamp;
1629 status.resolution = snd_timer_resolution(tu->timeri);
1630 status.lost = tu->timeri->lost;
1631 status.overrun = tu->overrun;
1632 spin_lock_irq(&tu->qlock);
1633 status.queue = tu->qused;
1634 spin_unlock_irq(&tu->qlock);
1635 if (copy_to_user(_status, &status, sizeof(status)))
1636 return -EFAULT;
1637 return 0;
1638}
1639
1640static int snd_timer_user_start(struct file *file)
1641{
1642 int err;
1643 snd_timer_user_t *tu;
1644
1645 tu = file->private_data;
1646 snd_assert(tu->timeri != NULL, return -ENXIO);
1647 snd_timer_stop(tu->timeri);
1648 tu->timeri->lost = 0;
1649 tu->last_resolution = 0;
1650 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1651}
1652
1653static int snd_timer_user_stop(struct file *file)
1654{
1655 int err;
1656 snd_timer_user_t *tu;
1657
1658 tu = file->private_data;
1659 snd_assert(tu->timeri != NULL, return -ENXIO);
1660 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1661}
1662
1663static int snd_timer_user_continue(struct file *file)
1664{
1665 int err;
1666 snd_timer_user_t *tu;
1667
1668 tu = file->private_data;
1669 snd_assert(tu->timeri != NULL, return -ENXIO);
1670 tu->timeri->lost = 0;
1671 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1672}
1673
15790a6b
TI		 1674static int snd_timer_user_pause(struct file *file)
1675{
1676 int err;
1677 snd_timer_user_t *tu;
1678
1679 tu = file->private_data;
1680 snd_assert(tu->timeri != NULL, return -ENXIO);
d138b445 1681 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
15790a6b
TI		 1682}
1683
8c50b37c
TI		 1684enum {
1685 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1686 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1687 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1688 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1689};
1690
1da177e4
LT		 1691static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1692{
1693 snd_timer_user_t *tu;
1694 void __user *argp = (void __user *)arg;
1695 int __user *p = argp;
1696
1697 tu = file->private_data;
1698 switch (cmd) {
1699 case SNDRV_TIMER_IOCTL_PVERSION:
1700 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1701 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1702 return snd_timer_user_next_device(argp);
1703 case SNDRV_TIMER_IOCTL_TREAD:
1704 {
1705 int xarg;
1706
c1935b4d
JK		 1707 down(&tu->tread_sem);
1708 if (tu->timeri) { /* too late */
1709 up(&tu->tread_sem);
1da177e4 1710 return -EBUSY;
c1935b4d
JK		 1711 }
1712 if (get_user(xarg, p)) {
1713 up(&tu->tread_sem);
1da177e4 1714 return -EFAULT;
c1935b4d 1715 }
1da177e4 1716 tu->tread = xarg ? 1 : 0;
c1935b4d 1717 up(&tu->tread_sem);
1da177e4
LT		 1718 return 0;
1719 }
1720 case SNDRV_TIMER_IOCTL_GINFO:
1721 return snd_timer_user_ginfo(file, argp);
1722 case SNDRV_TIMER_IOCTL_GPARAMS:
1723 return snd_timer_user_gparams(file, argp);
1724 case SNDRV_TIMER_IOCTL_GSTATUS:
1725 return snd_timer_user_gstatus(file, argp);
1726 case SNDRV_TIMER_IOCTL_SELECT:
1727 return snd_timer_user_tselect(file, argp);
1728 case SNDRV_TIMER_IOCTL_INFO:
1729 return snd_timer_user_info(file, argp);
1730 case SNDRV_TIMER_IOCTL_PARAMS:
1731 return snd_timer_user_params(file, argp);
1732 case SNDRV_TIMER_IOCTL_STATUS:
1733 return snd_timer_user_status(file, argp);
1734 case SNDRV_TIMER_IOCTL_START:
8c50b37c 1735 case SNDRV_TIMER_IOCTL_START_OLD:
1da177e4
LT		 1736 return snd_timer_user_start(file);
1737 case SNDRV_TIMER_IOCTL_STOP:
8c50b37c 1738 case SNDRV_TIMER_IOCTL_STOP_OLD:
1da177e4
LT		 1739 return snd_timer_user_stop(file);
1740 case SNDRV_TIMER_IOCTL_CONTINUE:
8c50b37c 1741 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1da177e4 1742 return snd_timer_user_continue(file);
15790a6b 1743 case SNDRV_TIMER_IOCTL_PAUSE:
8c50b37c 1744 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
15790a6b 1745 return snd_timer_user_pause(file);
1da177e4
LT		 1746 }
1747 return -ENOTTY;
1748}
1749
1750static int snd_timer_user_fasync(int fd, struct file * file, int on)
1751{
1752 snd_timer_user_t *tu;
1753 int err;
1754
1755 tu = file->private_data;
1756 err = fasync_helper(fd, file, on, &tu->fasync);
1757 if (err < 0)
1758 return err;
1759 return 0;
1760}
1761
1762static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
1763{
1764 snd_timer_user_t *tu;
1765 long result = 0, unit;
1766 int err = 0;
1767
1768 tu = file->private_data;
1769 unit = tu->tread ? sizeof(snd_timer_tread_t) : sizeof(snd_timer_read_t);
1770 spin_lock_irq(&tu->qlock);
1771 while ((long)count - result >= unit) {
1772 while (!tu->qused) {
1773 wait_queue_t wait;
1774
1775 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1776 err = -EAGAIN;
1777 break;
1778 }
1779
1780 set_current_state(TASK_INTERRUPTIBLE);
1781 init_waitqueue_entry(&wait, current);
1782 add_wait_queue(&tu->qchange_sleep, &wait);
1783
1784 spin_unlock_irq(&tu->qlock);
1785 schedule();
1786 spin_lock_irq(&tu->qlock);
1787
1788 remove_wait_queue(&tu->qchange_sleep, &wait);
1789
1790 if (signal_pending(current)) {
1791 err = -ERESTARTSYS;
1792 break;
1793 }
1794 }
1795
1796 spin_unlock_irq(&tu->qlock);
1797 if (err < 0)
1798 goto _error;
1799
1800 if (tu->tread) {
1801 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], sizeof(snd_timer_tread_t))) {
1802 err = -EFAULT;
1803 goto _error;
1804 }
1805 } else {
1806 if (copy_to_user(buffer, &tu->queue[tu->qhead++], sizeof(snd_timer_read_t))) {
1807 err = -EFAULT;
1808 goto _error;
1809 }
1810 }
1811
1812 tu->qhead %= tu->queue_size;
1813
1814 result += unit;
1815 buffer += unit;
1816
1817 spin_lock_irq(&tu->qlock);
1818 tu->qused--;
1819 }
1820 spin_unlock_irq(&tu->qlock);
1821 _error:
1822 return result > 0 ? result : err;
1823}
1824
1825static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1826{
1827 unsigned int mask;
1828 snd_timer_user_t *tu;
1829
1830 tu = file->private_data;
1831
1832 poll_wait(file, &tu->qchange_sleep, wait);
1833
1834 mask = 0;
1835 if (tu->qused)
1836 mask |= POLLIN | POLLRDNORM;
1837
1838 return mask;
1839}
1840
1841#ifdef CONFIG_COMPAT
1842#include "timer_compat.c"
1843#else
1844#define snd_timer_user_ioctl_compat NULL
1845#endif
1846
1847static struct file_operations snd_timer_f_ops =
1848{
1849 .owner = THIS_MODULE,
1850 .read = snd_timer_user_read,
1851 .open = snd_timer_user_open,
1852 .release = snd_timer_user_release,
1853 .poll = snd_timer_user_poll,
1854 .unlocked_ioctl = snd_timer_user_ioctl,
1855 .compat_ioctl = snd_timer_user_ioctl_compat,
1856 .fasync = snd_timer_user_fasync,
1857};
1858
1859static snd_minor_t snd_timer_reg =
1860{
1861 .comment = "timer",
1862 .f_ops = &snd_timer_f_ops,
1863};
1864
1865/*
1866 * ENTRY functions
1867 */
1868
1869static snd_info_entry_t *snd_timer_proc_entry = NULL;
1870
1871static int __init alsa_timer_init(void)
1872{
1873 int err;
1874 snd_info_entry_t *entry;
1875
1876#ifdef SNDRV_OSS_INFO_DEV_TIMERS
1877 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, "system timer");
1878#endif
1879 if ((entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL)) != NULL) {
1880 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128;
1881 entry->c.text.read = snd_timer_proc_read;
1882 if (snd_info_register(entry) < 0) {
1883 snd_info_free_entry(entry);
1884 entry = NULL;
1885 }
1886 }
1887 snd_timer_proc_entry = entry;
1888 if ((err = snd_timer_register_system()) < 0)
1889 snd_printk(KERN_ERR "unable to register system timer (%i)\n", err);
1890 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER,
1891 NULL, 0, &snd_timer_reg, "timer"))<0)
1892 snd_printk(KERN_ERR "unable to register timer device (%i)\n", err);
1893 return 0;
1894}
1895
1896static void __exit alsa_timer_exit(void)
1897{
1898 struct list_head *p, *n;
1899
1900 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1901 /* unregister the system timer */
1902 list_for_each_safe(p, n, &snd_timer_list) {
1903 snd_timer_t *timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1904 snd_timer_unregister(timer);
1905 }
1906 if (snd_timer_proc_entry) {
1907 snd_info_unregister(snd_timer_proc_entry);
1908 snd_timer_proc_entry = NULL;
1909 }
1910#ifdef SNDRV_OSS_INFO_DEV_TIMERS
1911 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1912#endif
1913}
1914
1915module_init(alsa_timer_init)
1916module_exit(alsa_timer_exit)
1917
1918EXPORT_SYMBOL(snd_timer_open);
1919EXPORT_SYMBOL(snd_timer_close);
1920EXPORT_SYMBOL(snd_timer_resolution);
1921EXPORT_SYMBOL(snd_timer_start);
1922EXPORT_SYMBOL(snd_timer_stop);
1923EXPORT_SYMBOL(snd_timer_continue);
1924EXPORT_SYMBOL(snd_timer_pause);
1925EXPORT_SYMBOL(snd_timer_new);
1926EXPORT_SYMBOL(snd_timer_notify);
1927EXPORT_SYMBOL(snd_timer_global_new);
1928EXPORT_SYMBOL(snd_timer_global_free);
1929EXPORT_SYMBOL(snd_timer_global_register);
1930EXPORT_SYMBOL(snd_timer_global_unregister);
1931EXPORT_SYMBOL(snd_timer_interrupt);
Linux kernel - Deliverables
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