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Merge branch 'for-linus' into work.lookups
[linux-2.6-block.git] / sound / core / timer.c
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1/*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/delay.h>
23#include <linux/init.h>
24#include <linux/slab.h>
25#include <linux/time.h>
26#include <linux/mutex.h>
27#include <linux/device.h>
28#include <linux/module.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
38#if IS_ENABLED(CONFIG_SND_HRTIMER)
39#define DEFAULT_TIMER_LIMIT 4
40#elif IS_ENABLED(CONFIG_SND_RTCTIMER)
41#define DEFAULT_TIMER_LIMIT 2
42#else
43#define DEFAULT_TIMER_LIMIT 1
44#endif
45
46static int timer_limit = DEFAULT_TIMER_LIMIT;
47static int timer_tstamp_monotonic = 1;
48MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
49MODULE_DESCRIPTION("ALSA timer interface");
50MODULE_LICENSE("GPL");
51module_param(timer_limit, int, 0444);
52MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
53module_param(timer_tstamp_monotonic, int, 0444);
54MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
55
56MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
57MODULE_ALIAS("devname:snd/timer");
58
59struct snd_timer_user {
60 struct snd_timer_instance *timeri;
61 int tread; /* enhanced read with timestamps and events */
62 unsigned long ticks;
63 unsigned long overrun;
64 int qhead;
65 int qtail;
66 int qused;
67 int queue_size;
68 bool disconnected;
69 struct snd_timer_read *queue;
70 struct snd_timer_tread *tqueue;
71 spinlock_t qlock;
72 unsigned long last_resolution;
73 unsigned int filter;
74 struct timespec tstamp; /* trigger tstamp */
75 wait_queue_head_t qchange_sleep;
76 struct fasync_struct *fasync;
77 struct mutex ioctl_lock;
78};
79
80/* list of timers */
81static LIST_HEAD(snd_timer_list);
82
83/* list of slave instances */
84static LIST_HEAD(snd_timer_slave_list);
85
86/* lock for slave active lists */
87static DEFINE_SPINLOCK(slave_active_lock);
88
89static DEFINE_MUTEX(register_mutex);
90
91static int snd_timer_free(struct snd_timer *timer);
92static int snd_timer_dev_free(struct snd_device *device);
93static int snd_timer_dev_register(struct snd_device *device);
94static int snd_timer_dev_disconnect(struct snd_device *device);
95
96static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
97
98/*
99 * create a timer instance with the given owner string.
100 * when timer is not NULL, increments the module counter
101 */
102static struct snd_timer_instance *snd_timer_instance_new(char *owner,
103 struct snd_timer *timer)
104{
105 struct snd_timer_instance *timeri;
106 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
107 if (timeri == NULL)
108 return NULL;
109 timeri->owner = kstrdup(owner, GFP_KERNEL);
110 if (! timeri->owner) {
111 kfree(timeri);
112 return NULL;
113 }
114 INIT_LIST_HEAD(&timeri->open_list);
115 INIT_LIST_HEAD(&timeri->active_list);
116 INIT_LIST_HEAD(&timeri->ack_list);
117 INIT_LIST_HEAD(&timeri->slave_list_head);
118 INIT_LIST_HEAD(&timeri->slave_active_head);
119
120 timeri->timer = timer;
121 if (timer && !try_module_get(timer->module)) {
122 kfree(timeri->owner);
123 kfree(timeri);
124 return NULL;
125 }
126
127 return timeri;
128}
129
130/*
131 * find a timer instance from the given timer id
132 */
133static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
134{
135 struct snd_timer *timer = NULL;
136
137 list_for_each_entry(timer, &snd_timer_list, device_list) {
138 if (timer->tmr_class != tid->dev_class)
139 continue;
140 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
141 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
142 (timer->card == NULL ||
143 timer->card->number != tid->card))
144 continue;
145 if (timer->tmr_device != tid->device)
146 continue;
147 if (timer->tmr_subdevice != tid->subdevice)
148 continue;
149 return timer;
150 }
151 return NULL;
152}
153
154#ifdef CONFIG_MODULES
155
156static void snd_timer_request(struct snd_timer_id *tid)
157{
158 switch (tid->dev_class) {
159 case SNDRV_TIMER_CLASS_GLOBAL:
160 if (tid->device < timer_limit)
161 request_module("snd-timer-%i", tid->device);
162 break;
163 case SNDRV_TIMER_CLASS_CARD:
164 case SNDRV_TIMER_CLASS_PCM:
165 if (tid->card < snd_ecards_limit)
166 request_module("snd-card-%i", tid->card);
167 break;
168 default:
169 break;
170 }
171}
172
173#endif
174
175/*
176 * look for a master instance matching with the slave id of the given slave.
177 * when found, relink the open_link of the slave.
178 *
179 * call this with register_mutex down.
180 */
181static void snd_timer_check_slave(struct snd_timer_instance *slave)
182{
183 struct snd_timer *timer;
184 struct snd_timer_instance *master;
185
186 /* FIXME: it's really dumb to look up all entries.. */
187 list_for_each_entry(timer, &snd_timer_list, device_list) {
188 list_for_each_entry(master, &timer->open_list_head, open_list) {
189 if (slave->slave_class == master->slave_class &&
190 slave->slave_id == master->slave_id) {
191 list_move_tail(&slave->open_list,
192 &master->slave_list_head);
193 spin_lock_irq(&slave_active_lock);
194 slave->master = master;
195 slave->timer = master->timer;
196 spin_unlock_irq(&slave_active_lock);
197 return;
198 }
199 }
200 }
201}
202
203/*
204 * look for slave instances matching with the slave id of the given master.
205 * when found, relink the open_link of slaves.
206 *
207 * call this with register_mutex down.
208 */
209static void snd_timer_check_master(struct snd_timer_instance *master)
210{
211 struct snd_timer_instance *slave, *tmp;
212
213 /* check all pending slaves */
214 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
215 if (slave->slave_class == master->slave_class &&
216 slave->slave_id == master->slave_id) {
217 list_move_tail(&slave->open_list, &master->slave_list_head);
218 spin_lock_irq(&slave_active_lock);
219 spin_lock(&master->timer->lock);
220 slave->master = master;
221 slave->timer = master->timer;
222 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
223 list_add_tail(&slave->active_list,
224 &master->slave_active_head);
225 spin_unlock(&master->timer->lock);
226 spin_unlock_irq(&slave_active_lock);
227 }
228 }
229}
230
231/*
232 * open a timer instance
233 * when opening a master, the slave id must be here given.
234 */
235int snd_timer_open(struct snd_timer_instance **ti,
236 char *owner, struct snd_timer_id *tid,
237 unsigned int slave_id)
238{
239 struct snd_timer *timer;
240 struct snd_timer_instance *timeri = NULL;
241
242 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
243 /* open a slave instance */
244 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
245 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
246 pr_debug("ALSA: timer: invalid slave class %i\n",
247 tid->dev_sclass);
248 return -EINVAL;
249 }
250 mutex_lock(&register_mutex);
251 timeri = snd_timer_instance_new(owner, NULL);
252 if (!timeri) {
253 mutex_unlock(&register_mutex);
254 return -ENOMEM;
255 }
256 timeri->slave_class = tid->dev_sclass;
257 timeri->slave_id = tid->device;
258 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
259 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
260 snd_timer_check_slave(timeri);
261 mutex_unlock(&register_mutex);
262 *ti = timeri;
263 return 0;
264 }
265
266 /* open a master instance */
267 mutex_lock(&register_mutex);
268 timer = snd_timer_find(tid);
269#ifdef CONFIG_MODULES
270 if (!timer) {
271 mutex_unlock(&register_mutex);
272 snd_timer_request(tid);
273 mutex_lock(&register_mutex);
274 timer = snd_timer_find(tid);
275 }
276#endif
277 if (!timer) {
278 mutex_unlock(&register_mutex);
279 return -ENODEV;
280 }
281 if (!list_empty(&timer->open_list_head)) {
282 timeri = list_entry(timer->open_list_head.next,
283 struct snd_timer_instance, open_list);
284 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
285 mutex_unlock(&register_mutex);
286 return -EBUSY;
287 }
288 }
289 timeri = snd_timer_instance_new(owner, timer);
290 if (!timeri) {
291 mutex_unlock(&register_mutex);
292 return -ENOMEM;
293 }
294 /* take a card refcount for safe disconnection */
295 if (timer->card)
296 get_device(&timer->card->card_dev);
297 timeri->slave_class = tid->dev_sclass;
298 timeri->slave_id = slave_id;
299 if (list_empty(&timer->open_list_head) && timer->hw.open)
300 timer->hw.open(timer);
301 list_add_tail(&timeri->open_list, &timer->open_list_head);
302 snd_timer_check_master(timeri);
303 mutex_unlock(&register_mutex);
304 *ti = timeri;
305 return 0;
306}
307
308/*
309 * close a timer instance
310 */
311int snd_timer_close(struct snd_timer_instance *timeri)
312{
313 struct snd_timer *timer = NULL;
314 struct snd_timer_instance *slave, *tmp;
315
316 if (snd_BUG_ON(!timeri))
317 return -ENXIO;
318
319 mutex_lock(&register_mutex);
320 list_del(&timeri->open_list);
321
322 /* force to stop the timer */
323 snd_timer_stop(timeri);
324
325 timer = timeri->timer;
326 if (timer) {
327 /* wait, until the active callback is finished */
328 spin_lock_irq(&timer->lock);
329 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
330 spin_unlock_irq(&timer->lock);
331 udelay(10);
332 spin_lock_irq(&timer->lock);
333 }
334 spin_unlock_irq(&timer->lock);
335
336 /* remove slave links */
337 spin_lock_irq(&slave_active_lock);
338 spin_lock(&timer->lock);
339 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
340 open_list) {
341 list_move_tail(&slave->open_list, &snd_timer_slave_list);
342 slave->master = NULL;
343 slave->timer = NULL;
344 list_del_init(&slave->ack_list);
345 list_del_init(&slave->active_list);
346 }
347 spin_unlock(&timer->lock);
348 spin_unlock_irq(&slave_active_lock);
349
350 /* slave doesn't need to release timer resources below */
351 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
352 timer = NULL;
353 }
354
355 if (timeri->private_free)
356 timeri->private_free(timeri);
357 kfree(timeri->owner);
358 kfree(timeri);
359
360 if (timer) {
361 if (list_empty(&timer->open_list_head) && timer->hw.close)
362 timer->hw.close(timer);
363 /* release a card refcount for safe disconnection */
364 if (timer->card)
365 put_device(&timer->card->card_dev);
366 module_put(timer->module);
367 }
368
369 mutex_unlock(&register_mutex);
370 return 0;
371}
372
373unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
374{
375 struct snd_timer * timer;
376
377 if (timeri == NULL)
378 return 0;
379 if ((timer = timeri->timer) != NULL) {
380 if (timer->hw.c_resolution)
381 return timer->hw.c_resolution(timer);
382 return timer->hw.resolution;
383 }
384 return 0;
385}
386
387static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
388{
389 struct snd_timer *timer;
390 unsigned long resolution = 0;
391 struct snd_timer_instance *ts;
392 struct timespec tstamp;
393
394 if (timer_tstamp_monotonic)
395 ktime_get_ts(&tstamp);
396 else
397 getnstimeofday(&tstamp);
398 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
399 event > SNDRV_TIMER_EVENT_PAUSE))
400 return;
401 if (event == SNDRV_TIMER_EVENT_START ||
402 event == SNDRV_TIMER_EVENT_CONTINUE)
403 resolution = snd_timer_resolution(ti);
404 if (ti->ccallback)
405 ti->ccallback(ti, event, &tstamp, resolution);
406 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
407 return;
408 timer = ti->timer;
409 if (timer == NULL)
410 return;
411 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
412 return;
413 list_for_each_entry(ts, &ti->slave_active_head, active_list)
414 if (ts->ccallback)
415 ts->ccallback(ts, event + 100, &tstamp, resolution);
416}
417
418/* start/continue a master timer */
419static int snd_timer_start1(struct snd_timer_instance *timeri,
420 bool start, unsigned long ticks)
421{
422 struct snd_timer *timer;
423 int result;
424 unsigned long flags;
425
426 timer = timeri->timer;
427 if (!timer)
428 return -EINVAL;
429
430 spin_lock_irqsave(&timer->lock, flags);
431 if (timer->card && timer->card->shutdown) {
432 result = -ENODEV;
433 goto unlock;
434 }
435 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
436 SNDRV_TIMER_IFLG_START)) {
437 result = -EBUSY;
438 goto unlock;
439 }
440
441 if (start)
442 timeri->ticks = timeri->cticks = ticks;
443 else if (!timeri->cticks)
444 timeri->cticks = 1;
445 timeri->pticks = 0;
446
447 list_move_tail(&timeri->active_list, &timer->active_list_head);
448 if (timer->running) {
449 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
450 goto __start_now;
451 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
452 timeri->flags |= SNDRV_TIMER_IFLG_START;
453 result = 1; /* delayed start */
454 } else {
455 if (start)
456 timer->sticks = ticks;
457 timer->hw.start(timer);
458 __start_now:
459 timer->running++;
460 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
461 result = 0;
462 }
463 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
464 SNDRV_TIMER_EVENT_CONTINUE);
465 unlock:
466 spin_unlock_irqrestore(&timer->lock, flags);
467 return result;
468}
469
470/* start/continue a slave timer */
471static int snd_timer_start_slave(struct snd_timer_instance *timeri,
472 bool start)
473{
474 unsigned long flags;
475
476 spin_lock_irqsave(&slave_active_lock, flags);
477 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
478 spin_unlock_irqrestore(&slave_active_lock, flags);
479 return -EBUSY;
480 }
481 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
482 if (timeri->master && timeri->timer) {
483 spin_lock(&timeri->timer->lock);
484 list_add_tail(&timeri->active_list,
485 &timeri->master->slave_active_head);
486 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
487 SNDRV_TIMER_EVENT_CONTINUE);
488 spin_unlock(&timeri->timer->lock);
489 }
490 spin_unlock_irqrestore(&slave_active_lock, flags);
491 return 1; /* delayed start */
492}
493
494/* stop/pause a master timer */
495static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
496{
497 struct snd_timer *timer;
498 int result = 0;
499 unsigned long flags;
500
501 timer = timeri->timer;
502 if (!timer)
503 return -EINVAL;
504 spin_lock_irqsave(&timer->lock, flags);
505 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
506 SNDRV_TIMER_IFLG_START))) {
507 result = -EBUSY;
508 goto unlock;
509 }
510 list_del_init(&timeri->ack_list);
511 list_del_init(&timeri->active_list);
512 if (timer->card && timer->card->shutdown)
513 goto unlock;
514 if (stop) {
515 timeri->cticks = timeri->ticks;
516 timeri->pticks = 0;
517 }
518 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
519 !(--timer->running)) {
520 timer->hw.stop(timer);
521 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
522 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
523 snd_timer_reschedule(timer, 0);
524 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
525 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
526 timer->hw.start(timer);
527 }
528 }
529 }
530 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
531 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
532 SNDRV_TIMER_EVENT_CONTINUE);
533 unlock:
534 spin_unlock_irqrestore(&timer->lock, flags);
535 return result;
536}
537
538/* stop/pause a slave timer */
539static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
540{
541 unsigned long flags;
542
543 spin_lock_irqsave(&slave_active_lock, flags);
544 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
545 spin_unlock_irqrestore(&slave_active_lock, flags);
546 return -EBUSY;
547 }
548 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
549 if (timeri->timer) {
550 spin_lock(&timeri->timer->lock);
551 list_del_init(&timeri->ack_list);
552 list_del_init(&timeri->active_list);
553 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
554 SNDRV_TIMER_EVENT_CONTINUE);
555 spin_unlock(&timeri->timer->lock);
556 }
557 spin_unlock_irqrestore(&slave_active_lock, flags);
558 return 0;
559}
560
561/*
562 * start the timer instance
563 */
564int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
565{
566 if (timeri == NULL || ticks < 1)
567 return -EINVAL;
568 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
569 return snd_timer_start_slave(timeri, true);
570 else
571 return snd_timer_start1(timeri, true, ticks);
572}
573
574/*
575 * stop the timer instance.
576 *
577 * do not call this from the timer callback!
578 */
579int snd_timer_stop(struct snd_timer_instance *timeri)
580{
581 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
582 return snd_timer_stop_slave(timeri, true);
583 else
584 return snd_timer_stop1(timeri, true);
585}
586
587/*
588 * start again.. the tick is kept.
589 */
590int snd_timer_continue(struct snd_timer_instance *timeri)
591{
592 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
593 return snd_timer_start_slave(timeri, false);
594 else
595 return snd_timer_start1(timeri, false, 0);
596}
597
598/*
599 * pause.. remember the ticks left
600 */
601int snd_timer_pause(struct snd_timer_instance * timeri)
602{
603 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
604 return snd_timer_stop_slave(timeri, false);
605 else
606 return snd_timer_stop1(timeri, false);
607}
608
609/*
610 * reschedule the timer
611 *
612 * start pending instances and check the scheduling ticks.
613 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
614 */
615static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
616{
617 struct snd_timer_instance *ti;
618 unsigned long ticks = ~0UL;
619
620 list_for_each_entry(ti, &timer->active_list_head, active_list) {
621 if (ti->flags & SNDRV_TIMER_IFLG_START) {
622 ti->flags &= ~SNDRV_TIMER_IFLG_START;
623 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
624 timer->running++;
625 }
626 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
627 if (ticks > ti->cticks)
628 ticks = ti->cticks;
629 }
630 }
631 if (ticks == ~0UL) {
632 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
633 return;
634 }
635 if (ticks > timer->hw.ticks)
636 ticks = timer->hw.ticks;
637 if (ticks_left != ticks)
638 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
639 timer->sticks = ticks;
640}
641
642/*
643 * timer tasklet
644 *
645 */
646static void snd_timer_tasklet(unsigned long arg)
647{
648 struct snd_timer *timer = (struct snd_timer *) arg;
649 struct snd_timer_instance *ti;
650 struct list_head *p;
651 unsigned long resolution, ticks;
652 unsigned long flags;
653
654 if (timer->card && timer->card->shutdown)
655 return;
656
657 spin_lock_irqsave(&timer->lock, flags);
658 /* now process all callbacks */
659 while (!list_empty(&timer->sack_list_head)) {
660 p = timer->sack_list_head.next; /* get first item */
661 ti = list_entry(p, struct snd_timer_instance, ack_list);
662
663 /* remove from ack_list and make empty */
664 list_del_init(p);
665
666 ticks = ti->pticks;
667 ti->pticks = 0;
668 resolution = ti->resolution;
669
670 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
671 spin_unlock(&timer->lock);
672 if (ti->callback)
673 ti->callback(ti, resolution, ticks);
674 spin_lock(&timer->lock);
675 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
676 }
677 spin_unlock_irqrestore(&timer->lock, flags);
678}
679
680/*
681 * timer interrupt
682 *
683 * ticks_left is usually equal to timer->sticks.
684 *
685 */
686void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
687{
688 struct snd_timer_instance *ti, *ts, *tmp;
689 unsigned long resolution, ticks;
690 struct list_head *p, *ack_list_head;
691 unsigned long flags;
692 int use_tasklet = 0;
693
694 if (timer == NULL)
695 return;
696
697 if (timer->card && timer->card->shutdown)
698 return;
699
700 spin_lock_irqsave(&timer->lock, flags);
701
702 /* remember the current resolution */
703 if (timer->hw.c_resolution)
704 resolution = timer->hw.c_resolution(timer);
705 else
706 resolution = timer->hw.resolution;
707
708 /* loop for all active instances
709 * Here we cannot use list_for_each_entry because the active_list of a
710 * processed instance is relinked to done_list_head before the callback
711 * is called.
712 */
713 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
714 active_list) {
715 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
716 continue;
717 ti->pticks += ticks_left;
718 ti->resolution = resolution;
719 if (ti->cticks < ticks_left)
720 ti->cticks = 0;
721 else
722 ti->cticks -= ticks_left;
723 if (ti->cticks) /* not expired */
724 continue;
725 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
726 ti->cticks = ti->ticks;
727 } else {
728 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
729 --timer->running;
730 list_del_init(&ti->active_list);
731 }
732 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
733 (ti->flags & SNDRV_TIMER_IFLG_FAST))
734 ack_list_head = &timer->ack_list_head;
735 else
736 ack_list_head = &timer->sack_list_head;
737 if (list_empty(&ti->ack_list))
738 list_add_tail(&ti->ack_list, ack_list_head);
739 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
740 ts->pticks = ti->pticks;
741 ts->resolution = resolution;
742 if (list_empty(&ts->ack_list))
743 list_add_tail(&ts->ack_list, ack_list_head);
744 }
745 }
746 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
747 snd_timer_reschedule(timer, timer->sticks);
748 if (timer->running) {
749 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
750 timer->hw.stop(timer);
751 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
752 }
753 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
754 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
755 /* restart timer */
756 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
757 timer->hw.start(timer);
758 }
759 } else {
760 timer->hw.stop(timer);
761 }
762
763 /* now process all fast callbacks */
764 while (!list_empty(&timer->ack_list_head)) {
765 p = timer->ack_list_head.next; /* get first item */
766 ti = list_entry(p, struct snd_timer_instance, ack_list);
767
768 /* remove from ack_list and make empty */
769 list_del_init(p);
770
771 ticks = ti->pticks;
772 ti->pticks = 0;
773
774 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
775 spin_unlock(&timer->lock);
776 if (ti->callback)
777 ti->callback(ti, resolution, ticks);
778 spin_lock(&timer->lock);
779 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
780 }
781
782 /* do we have any slow callbacks? */
783 use_tasklet = !list_empty(&timer->sack_list_head);
784 spin_unlock_irqrestore(&timer->lock, flags);
785
786 if (use_tasklet)
787 tasklet_schedule(&timer->task_queue);
788}
789
790/*
791
792 */
793
794int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
795 struct snd_timer **rtimer)
796{
797 struct snd_timer *timer;
798 int err;
799 static struct snd_device_ops ops = {
800 .dev_free = snd_timer_dev_free,
801 .dev_register = snd_timer_dev_register,
802 .dev_disconnect = snd_timer_dev_disconnect,
803 };
804
805 if (snd_BUG_ON(!tid))
806 return -EINVAL;
807 if (rtimer)
808 *rtimer = NULL;
809 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
810 if (!timer)
811 return -ENOMEM;
812 timer->tmr_class = tid->dev_class;
813 timer->card = card;
814 timer->tmr_device = tid->device;
815 timer->tmr_subdevice = tid->subdevice;
816 if (id)
817 strlcpy(timer->id, id, sizeof(timer->id));
818 INIT_LIST_HEAD(&timer->device_list);
819 INIT_LIST_HEAD(&timer->open_list_head);
820 INIT_LIST_HEAD(&timer->active_list_head);
821 INIT_LIST_HEAD(&timer->ack_list_head);
822 INIT_LIST_HEAD(&timer->sack_list_head);
823 spin_lock_init(&timer->lock);
824 tasklet_init(&timer->task_queue, snd_timer_tasklet,
825 (unsigned long)timer);
826 if (card != NULL) {
827 timer->module = card->module;
828 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
829 if (err < 0) {
830 snd_timer_free(timer);
831 return err;
832 }
833 }
834 if (rtimer)
835 *rtimer = timer;
836 return 0;
837}
838
839static int snd_timer_free(struct snd_timer *timer)
840{
841 if (!timer)
842 return 0;
843
844 mutex_lock(&register_mutex);
845 if (! list_empty(&timer->open_list_head)) {
846 struct list_head *p, *n;
847 struct snd_timer_instance *ti;
848 pr_warn("ALSA: timer %p is busy?\n", timer);
849 list_for_each_safe(p, n, &timer->open_list_head) {
850 list_del_init(p);
851 ti = list_entry(p, struct snd_timer_instance, open_list);
852 ti->timer = NULL;
853 }
854 }
855 list_del(&timer->device_list);
856 mutex_unlock(&register_mutex);
857
858 if (timer->private_free)
859 timer->private_free(timer);
860 kfree(timer);
861 return 0;
862}
863
864static int snd_timer_dev_free(struct snd_device *device)
865{
866 struct snd_timer *timer = device->device_data;
867 return snd_timer_free(timer);
868}
869
870static int snd_timer_dev_register(struct snd_device *dev)
871{
872 struct snd_timer *timer = dev->device_data;
873 struct snd_timer *timer1;
874
875 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
876 return -ENXIO;
877 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
878 !timer->hw.resolution && timer->hw.c_resolution == NULL)
879 return -EINVAL;
880
881 mutex_lock(&register_mutex);
882 list_for_each_entry(timer1, &snd_timer_list, device_list) {
883 if (timer1->tmr_class > timer->tmr_class)
884 break;
885 if (timer1->tmr_class < timer->tmr_class)
886 continue;
887 if (timer1->card && timer->card) {
888 if (timer1->card->number > timer->card->number)
889 break;
890 if (timer1->card->number < timer->card->number)
891 continue;
892 }
893 if (timer1->tmr_device > timer->tmr_device)
894 break;
895 if (timer1->tmr_device < timer->tmr_device)
896 continue;
897 if (timer1->tmr_subdevice > timer->tmr_subdevice)
898 break;
899 if (timer1->tmr_subdevice < timer->tmr_subdevice)
900 continue;
901 /* conflicts.. */
902 mutex_unlock(&register_mutex);
903 return -EBUSY;
904 }
905 list_add_tail(&timer->device_list, &timer1->device_list);
906 mutex_unlock(&register_mutex);
907 return 0;
908}
909
910static int snd_timer_dev_disconnect(struct snd_device *device)
911{
912 struct snd_timer *timer = device->device_data;
913 struct snd_timer_instance *ti;
914
915 mutex_lock(&register_mutex);
916 list_del_init(&timer->device_list);
917 /* wake up pending sleepers */
918 list_for_each_entry(ti, &timer->open_list_head, open_list) {
919 if (ti->disconnect)
920 ti->disconnect(ti);
921 }
922 mutex_unlock(&register_mutex);
923 return 0;
924}
925
926void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
927{
928 unsigned long flags;
929 unsigned long resolution = 0;
930 struct snd_timer_instance *ti, *ts;
931
932 if (timer->card && timer->card->shutdown)
933 return;
934 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
935 return;
936 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
937 event > SNDRV_TIMER_EVENT_MRESUME))
938 return;
939 spin_lock_irqsave(&timer->lock, flags);
940 if (event == SNDRV_TIMER_EVENT_MSTART ||
941 event == SNDRV_TIMER_EVENT_MCONTINUE ||
942 event == SNDRV_TIMER_EVENT_MRESUME) {
943 if (timer->hw.c_resolution)
944 resolution = timer->hw.c_resolution(timer);
945 else
946 resolution = timer->hw.resolution;
947 }
948 list_for_each_entry(ti, &timer->active_list_head, active_list) {
949 if (ti->ccallback)
950 ti->ccallback(ti, event, tstamp, resolution);
951 list_for_each_entry(ts, &ti->slave_active_head, active_list)
952 if (ts->ccallback)
953 ts->ccallback(ts, event, tstamp, resolution);
954 }
955 spin_unlock_irqrestore(&timer->lock, flags);
956}
957
958/*
959 * exported functions for global timers
960 */
961int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
962{
963 struct snd_timer_id tid;
964
965 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
966 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
967 tid.card = -1;
968 tid.device = device;
969 tid.subdevice = 0;
970 return snd_timer_new(NULL, id, &tid, rtimer);
971}
972
973int snd_timer_global_free(struct snd_timer *timer)
974{
975 return snd_timer_free(timer);
976}
977
978int snd_timer_global_register(struct snd_timer *timer)
979{
980 struct snd_device dev;
981
982 memset(&dev, 0, sizeof(dev));
983 dev.device_data = timer;
984 return snd_timer_dev_register(&dev);
985}
986
987/*
988 * System timer
989 */
990
991struct snd_timer_system_private {
992 struct timer_list tlist;
993 unsigned long last_expires;
994 unsigned long last_jiffies;
995 unsigned long correction;
996};
997
998static void snd_timer_s_function(unsigned long data)
999{
1000 struct snd_timer *timer = (struct snd_timer *)data;
1001 struct snd_timer_system_private *priv = timer->private_data;
1002 unsigned long jiff = jiffies;
1003 if (time_after(jiff, priv->last_expires))
1004 priv->correction += (long)jiff - (long)priv->last_expires;
1005 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1006}
1007
1008static int snd_timer_s_start(struct snd_timer * timer)
1009{
1010 struct snd_timer_system_private *priv;
1011 unsigned long njiff;
1012
1013 priv = (struct snd_timer_system_private *) timer->private_data;
1014 njiff = (priv->last_jiffies = jiffies);
1015 if (priv->correction > timer->sticks - 1) {
1016 priv->correction -= timer->sticks - 1;
1017 njiff++;
1018 } else {
1019 njiff += timer->sticks - priv->correction;
1020 priv->correction = 0;
1021 }
1022 priv->last_expires = njiff;
1023 mod_timer(&priv->tlist, njiff);
1024 return 0;
1025}
1026
1027static int snd_timer_s_stop(struct snd_timer * timer)
1028{
1029 struct snd_timer_system_private *priv;
1030 unsigned long jiff;
1031
1032 priv = (struct snd_timer_system_private *) timer->private_data;
1033 del_timer(&priv->tlist);
1034 jiff = jiffies;
1035 if (time_before(jiff, priv->last_expires))
1036 timer->sticks = priv->last_expires - jiff;
1037 else
1038 timer->sticks = 1;
1039 priv->correction = 0;
1040 return 0;
1041}
1042
1043static int snd_timer_s_close(struct snd_timer *timer)
1044{
1045 struct snd_timer_system_private *priv;
1046
1047 priv = (struct snd_timer_system_private *)timer->private_data;
1048 del_timer_sync(&priv->tlist);
1049 return 0;
1050}
1051
1052static struct snd_timer_hardware snd_timer_system =
1053{
1054 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1055 .resolution = 1000000000L / HZ,
1056 .ticks = 10000000L,
1057 .close = snd_timer_s_close,
1058 .start = snd_timer_s_start,
1059 .stop = snd_timer_s_stop
1060};
1061
1062static void snd_timer_free_system(struct snd_timer *timer)
1063{
1064 kfree(timer->private_data);
1065}
1066
1067static int snd_timer_register_system(void)
1068{
1069 struct snd_timer *timer;
1070 struct snd_timer_system_private *priv;
1071 int err;
1072
1073 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1074 if (err < 0)
1075 return err;
1076 strcpy(timer->name, "system timer");
1077 timer->hw = snd_timer_system;
1078 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1079 if (priv == NULL) {
1080 snd_timer_free(timer);
1081 return -ENOMEM;
1082 }
1083 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1084 timer->private_data = priv;
1085 timer->private_free = snd_timer_free_system;
1086 return snd_timer_global_register(timer);
1087}
1088
1089#ifdef CONFIG_SND_PROC_FS
1090/*
1091 * Info interface
1092 */
1093
1094static void snd_timer_proc_read(struct snd_info_entry *entry,
1095 struct snd_info_buffer *buffer)
1096{
1097 struct snd_timer *timer;
1098 struct snd_timer_instance *ti;
1099
1100 mutex_lock(&register_mutex);
1101 list_for_each_entry(timer, &snd_timer_list, device_list) {
1102 if (timer->card && timer->card->shutdown)
1103 continue;
1104 switch (timer->tmr_class) {
1105 case SNDRV_TIMER_CLASS_GLOBAL:
1106 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1107 break;
1108 case SNDRV_TIMER_CLASS_CARD:
1109 snd_iprintf(buffer, "C%i-%i: ",
1110 timer->card->number, timer->tmr_device);
1111 break;
1112 case SNDRV_TIMER_CLASS_PCM:
1113 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1114 timer->tmr_device, timer->tmr_subdevice);
1115 break;
1116 default:
1117 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1118 timer->card ? timer->card->number : -1,
1119 timer->tmr_device, timer->tmr_subdevice);
1120 }
1121 snd_iprintf(buffer, "%s :", timer->name);
1122 if (timer->hw.resolution)
1123 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1124 timer->hw.resolution / 1000,
1125 timer->hw.resolution % 1000,
1126 timer->hw.ticks);
1127 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1128 snd_iprintf(buffer, " SLAVE");
1129 snd_iprintf(buffer, "\n");
1130 list_for_each_entry(ti, &timer->open_list_head, open_list)
1131 snd_iprintf(buffer, " Client %s : %s\n",
1132 ti->owner ? ti->owner : "unknown",
1133 ti->flags & (SNDRV_TIMER_IFLG_START |
1134 SNDRV_TIMER_IFLG_RUNNING)
1135 ? "running" : "stopped");
1136 }
1137 mutex_unlock(&register_mutex);
1138}
1139
1140static struct snd_info_entry *snd_timer_proc_entry;
1141
1142static void __init snd_timer_proc_init(void)
1143{
1144 struct snd_info_entry *entry;
1145
1146 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1147 if (entry != NULL) {
1148 entry->c.text.read = snd_timer_proc_read;
1149 if (snd_info_register(entry) < 0) {
1150 snd_info_free_entry(entry);
1151 entry = NULL;
1152 }
1153 }
1154 snd_timer_proc_entry = entry;
1155}
1156
1157static void __exit snd_timer_proc_done(void)
1158{
1159 snd_info_free_entry(snd_timer_proc_entry);
1160}
1161#else /* !CONFIG_SND_PROC_FS */
1162#define snd_timer_proc_init()
1163#define snd_timer_proc_done()
1164#endif
1165
1166/*
1167 * USER SPACE interface
1168 */
1169
1170static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1171 unsigned long resolution,
1172 unsigned long ticks)
1173{
1174 struct snd_timer_user *tu = timeri->callback_data;
1175 struct snd_timer_read *r;
1176 int prev;
1177
1178 spin_lock(&tu->qlock);
1179 if (tu->qused > 0) {
1180 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1181 r = &tu->queue[prev];
1182 if (r->resolution == resolution) {
1183 r->ticks += ticks;
1184 goto __wake;
1185 }
1186 }
1187 if (tu->qused >= tu->queue_size) {
1188 tu->overrun++;
1189 } else {
1190 r = &tu->queue[tu->qtail++];
1191 tu->qtail %= tu->queue_size;
1192 r->resolution = resolution;
1193 r->ticks = ticks;
1194 tu->qused++;
1195 }
1196 __wake:
1197 spin_unlock(&tu->qlock);
1198 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1199 wake_up(&tu->qchange_sleep);
1200}
1201
1202static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1203 struct snd_timer_tread *tread)
1204{
1205 if (tu->qused >= tu->queue_size) {
1206 tu->overrun++;
1207 } else {
1208 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1209 tu->qtail %= tu->queue_size;
1210 tu->qused++;
1211 }
1212}
1213
1214static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1215 int event,
1216 struct timespec *tstamp,
1217 unsigned long resolution)
1218{
1219 struct snd_timer_user *tu = timeri->callback_data;
1220 struct snd_timer_tread r1;
1221 unsigned long flags;
1222
1223 if (event >= SNDRV_TIMER_EVENT_START &&
1224 event <= SNDRV_TIMER_EVENT_PAUSE)
1225 tu->tstamp = *tstamp;
1226 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1227 return;
1228 r1.event = event;
1229 r1.tstamp = *tstamp;
1230 r1.val = resolution;
1231 spin_lock_irqsave(&tu->qlock, flags);
1232 snd_timer_user_append_to_tqueue(tu, &r1);
1233 spin_unlock_irqrestore(&tu->qlock, flags);
1234 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1235 wake_up(&tu->qchange_sleep);
1236}
1237
1238static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1239{
1240 struct snd_timer_user *tu = timeri->callback_data;
1241
1242 tu->disconnected = true;
1243 wake_up(&tu->qchange_sleep);
1244}
1245
1246static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1247 unsigned long resolution,
1248 unsigned long ticks)
1249{
1250 struct snd_timer_user *tu = timeri->callback_data;
1251 struct snd_timer_tread *r, r1;
1252 struct timespec tstamp;
1253 int prev, append = 0;
1254
1255 memset(&tstamp, 0, sizeof(tstamp));
1256 spin_lock(&tu->qlock);
1257 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1258 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1259 spin_unlock(&tu->qlock);
1260 return;
1261 }
1262 if (tu->last_resolution != resolution || ticks > 0) {
1263 if (timer_tstamp_monotonic)
1264 ktime_get_ts(&tstamp);
1265 else
1266 getnstimeofday(&tstamp);
1267 }
1268 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1269 tu->last_resolution != resolution) {
1270 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1271 r1.tstamp = tstamp;
1272 r1.val = resolution;
1273 snd_timer_user_append_to_tqueue(tu, &r1);
1274 tu->last_resolution = resolution;
1275 append++;
1276 }
1277 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1278 goto __wake;
1279 if (ticks == 0)
1280 goto __wake;
1281 if (tu->qused > 0) {
1282 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1283 r = &tu->tqueue[prev];
1284 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1285 r->tstamp = tstamp;
1286 r->val += ticks;
1287 append++;
1288 goto __wake;
1289 }
1290 }
1291 r1.event = SNDRV_TIMER_EVENT_TICK;
1292 r1.tstamp = tstamp;
1293 r1.val = ticks;
1294 snd_timer_user_append_to_tqueue(tu, &r1);
1295 append++;
1296 __wake:
1297 spin_unlock(&tu->qlock);
1298 if (append == 0)
1299 return;
1300 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1301 wake_up(&tu->qchange_sleep);
1302}
1303
1304static int snd_timer_user_open(struct inode *inode, struct file *file)
1305{
1306 struct snd_timer_user *tu;
1307 int err;
1308
1309 err = nonseekable_open(inode, file);
1310 if (err < 0)
1311 return err;
1312
1313 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1314 if (tu == NULL)
1315 return -ENOMEM;
1316 spin_lock_init(&tu->qlock);
1317 init_waitqueue_head(&tu->qchange_sleep);
1318 mutex_init(&tu->ioctl_lock);
1319 tu->ticks = 1;
1320 tu->queue_size = 128;
1321 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1322 GFP_KERNEL);
1323 if (tu->queue == NULL) {
1324 kfree(tu);
1325 return -ENOMEM;
1326 }
1327 file->private_data = tu;
1328 return 0;
1329}
1330
1331static int snd_timer_user_release(struct inode *inode, struct file *file)
1332{
1333 struct snd_timer_user *tu;
1334
1335 if (file->private_data) {
1336 tu = file->private_data;
1337 file->private_data = NULL;
1338 mutex_lock(&tu->ioctl_lock);
1339 if (tu->timeri)
1340 snd_timer_close(tu->timeri);
1341 mutex_unlock(&tu->ioctl_lock);
1342 kfree(tu->queue);
1343 kfree(tu->tqueue);
1344 kfree(tu);
1345 }
1346 return 0;
1347}
1348
1349static void snd_timer_user_zero_id(struct snd_timer_id *id)
1350{
1351 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1352 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1353 id->card = -1;
1354 id->device = -1;
1355 id->subdevice = -1;
1356}
1357
1358static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1359{
1360 id->dev_class = timer->tmr_class;
1361 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1362 id->card = timer->card ? timer->card->number : -1;
1363 id->device = timer->tmr_device;
1364 id->subdevice = timer->tmr_subdevice;
1365}
1366
1367static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1368{
1369 struct snd_timer_id id;
1370 struct snd_timer *timer;
1371 struct list_head *p;
1372
1373 if (copy_from_user(&id, _tid, sizeof(id)))
1374 return -EFAULT;
1375 mutex_lock(&register_mutex);
1376 if (id.dev_class < 0) { /* first item */
1377 if (list_empty(&snd_timer_list))
1378 snd_timer_user_zero_id(&id);
1379 else {
1380 timer = list_entry(snd_timer_list.next,
1381 struct snd_timer, device_list);
1382 snd_timer_user_copy_id(&id, timer);
1383 }
1384 } else {
1385 switch (id.dev_class) {
1386 case SNDRV_TIMER_CLASS_GLOBAL:
1387 id.device = id.device < 0 ? 0 : id.device + 1;
1388 list_for_each(p, &snd_timer_list) {
1389 timer = list_entry(p, struct snd_timer, device_list);
1390 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1391 snd_timer_user_copy_id(&id, timer);
1392 break;
1393 }
1394 if (timer->tmr_device >= id.device) {
1395 snd_timer_user_copy_id(&id, timer);
1396 break;
1397 }
1398 }
1399 if (p == &snd_timer_list)
1400 snd_timer_user_zero_id(&id);
1401 break;
1402 case SNDRV_TIMER_CLASS_CARD:
1403 case SNDRV_TIMER_CLASS_PCM:
1404 if (id.card < 0) {
1405 id.card = 0;
1406 } else {
1407 if (id.card < 0) {
1408 id.card = 0;
1409 } else {
1410 if (id.device < 0) {
1411 id.device = 0;
1412 } else {
1413 if (id.subdevice < 0) {
1414 id.subdevice = 0;
1415 } else {
1416 id.subdevice++;
1417 }
1418 }
1419 }
1420 }
1421 list_for_each(p, &snd_timer_list) {
1422 timer = list_entry(p, struct snd_timer, device_list);
1423 if (timer->tmr_class > id.dev_class) {
1424 snd_timer_user_copy_id(&id, timer);
1425 break;
1426 }
1427 if (timer->tmr_class < id.dev_class)
1428 continue;
1429 if (timer->card->number > id.card) {
1430 snd_timer_user_copy_id(&id, timer);
1431 break;
1432 }
1433 if (timer->card->number < id.card)
1434 continue;
1435 if (timer->tmr_device > id.device) {
1436 snd_timer_user_copy_id(&id, timer);
1437 break;
1438 }
1439 if (timer->tmr_device < id.device)
1440 continue;
1441 if (timer->tmr_subdevice > id.subdevice) {
1442 snd_timer_user_copy_id(&id, timer);
1443 break;
1444 }
1445 if (timer->tmr_subdevice < id.subdevice)
1446 continue;
1447 snd_timer_user_copy_id(&id, timer);
1448 break;
1449 }
1450 if (p == &snd_timer_list)
1451 snd_timer_user_zero_id(&id);
1452 break;
1453 default:
1454 snd_timer_user_zero_id(&id);
1455 }
1456 }
1457 mutex_unlock(&register_mutex);
1458 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1459 return -EFAULT;
1460 return 0;
1461}
1462
1463static int snd_timer_user_ginfo(struct file *file,
1464 struct snd_timer_ginfo __user *_ginfo)
1465{
1466 struct snd_timer_ginfo *ginfo;
1467 struct snd_timer_id tid;
1468 struct snd_timer *t;
1469 struct list_head *p;
1470 int err = 0;
1471
1472 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1473 if (IS_ERR(ginfo))
1474 return PTR_ERR(ginfo);
1475
1476 tid = ginfo->tid;
1477 memset(ginfo, 0, sizeof(*ginfo));
1478 ginfo->tid = tid;
1479 mutex_lock(&register_mutex);
1480 t = snd_timer_find(&tid);
1481 if (t != NULL) {
1482 ginfo->card = t->card ? t->card->number : -1;
1483 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1484 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1485 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1486 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1487 ginfo->resolution = t->hw.resolution;
1488 if (t->hw.resolution_min > 0) {
1489 ginfo->resolution_min = t->hw.resolution_min;
1490 ginfo->resolution_max = t->hw.resolution_max;
1491 }
1492 list_for_each(p, &t->open_list_head) {
1493 ginfo->clients++;
1494 }
1495 } else {
1496 err = -ENODEV;
1497 }
1498 mutex_unlock(&register_mutex);
1499 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1500 err = -EFAULT;
1501 kfree(ginfo);
1502 return err;
1503}
1504
1505static int timer_set_gparams(struct snd_timer_gparams *gparams)
1506{
1507 struct snd_timer *t;
1508 int err;
1509
1510 mutex_lock(&register_mutex);
1511 t = snd_timer_find(&gparams->tid);
1512 if (!t) {
1513 err = -ENODEV;
1514 goto _error;
1515 }
1516 if (!list_empty(&t->open_list_head)) {
1517 err = -EBUSY;
1518 goto _error;
1519 }
1520 if (!t->hw.set_period) {
1521 err = -ENOSYS;
1522 goto _error;
1523 }
1524 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1525_error:
1526 mutex_unlock(&register_mutex);
1527 return err;
1528}
1529
1530static int snd_timer_user_gparams(struct file *file,
1531 struct snd_timer_gparams __user *_gparams)
1532{
1533 struct snd_timer_gparams gparams;
1534
1535 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1536 return -EFAULT;
1537 return timer_set_gparams(&gparams);
1538}
1539
1540static int snd_timer_user_gstatus(struct file *file,
1541 struct snd_timer_gstatus __user *_gstatus)
1542{
1543 struct snd_timer_gstatus gstatus;
1544 struct snd_timer_id tid;
1545 struct snd_timer *t;
1546 int err = 0;
1547
1548 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1549 return -EFAULT;
1550 tid = gstatus.tid;
1551 memset(&gstatus, 0, sizeof(gstatus));
1552 gstatus.tid = tid;
1553 mutex_lock(&register_mutex);
1554 t = snd_timer_find(&tid);
1555 if (t != NULL) {
1556 if (t->hw.c_resolution)
1557 gstatus.resolution = t->hw.c_resolution(t);
1558 else
1559 gstatus.resolution = t->hw.resolution;
1560 if (t->hw.precise_resolution) {
1561 t->hw.precise_resolution(t, &gstatus.resolution_num,
1562 &gstatus.resolution_den);
1563 } else {
1564 gstatus.resolution_num = gstatus.resolution;
1565 gstatus.resolution_den = 1000000000uL;
1566 }
1567 } else {
1568 err = -ENODEV;
1569 }
1570 mutex_unlock(&register_mutex);
1571 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1572 err = -EFAULT;
1573 return err;
1574}
1575
1576static int snd_timer_user_tselect(struct file *file,
1577 struct snd_timer_select __user *_tselect)
1578{
1579 struct snd_timer_user *tu;
1580 struct snd_timer_select tselect;
1581 char str[32];
1582 int err = 0;
1583
1584 tu = file->private_data;
1585 if (tu->timeri) {
1586 snd_timer_close(tu->timeri);
1587 tu->timeri = NULL;
1588 }
1589 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1590 err = -EFAULT;
1591 goto __err;
1592 }
1593 sprintf(str, "application %i", current->pid);
1594 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1595 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1596 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1597 if (err < 0)
1598 goto __err;
1599
1600 kfree(tu->queue);
1601 tu->queue = NULL;
1602 kfree(tu->tqueue);
1603 tu->tqueue = NULL;
1604 if (tu->tread) {
1605 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1606 GFP_KERNEL);
1607 if (tu->tqueue == NULL)
1608 err = -ENOMEM;
1609 } else {
1610 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1611 GFP_KERNEL);
1612 if (tu->queue == NULL)
1613 err = -ENOMEM;
1614 }
1615
1616 if (err < 0) {
1617 snd_timer_close(tu->timeri);
1618 tu->timeri = NULL;
1619 } else {
1620 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1621 tu->timeri->callback = tu->tread
1622 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1623 tu->timeri->ccallback = snd_timer_user_ccallback;
1624 tu->timeri->callback_data = (void *)tu;
1625 tu->timeri->disconnect = snd_timer_user_disconnect;
1626 }
1627
1628 __err:
1629 return err;
1630}
1631
1632static int snd_timer_user_info(struct file *file,
1633 struct snd_timer_info __user *_info)
1634{
1635 struct snd_timer_user *tu;
1636 struct snd_timer_info *info;
1637 struct snd_timer *t;
1638 int err = 0;
1639
1640 tu = file->private_data;
1641 if (!tu->timeri)
1642 return -EBADFD;
1643 t = tu->timeri->timer;
1644 if (!t)
1645 return -EBADFD;
1646
1647 info = kzalloc(sizeof(*info), GFP_KERNEL);
1648 if (! info)
1649 return -ENOMEM;
1650 info->card = t->card ? t->card->number : -1;
1651 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1652 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1653 strlcpy(info->id, t->id, sizeof(info->id));
1654 strlcpy(info->name, t->name, sizeof(info->name));
1655 info->resolution = t->hw.resolution;
1656 if (copy_to_user(_info, info, sizeof(*_info)))
1657 err = -EFAULT;
1658 kfree(info);
1659 return err;
1660}
1661
1662static int snd_timer_user_params(struct file *file,
1663 struct snd_timer_params __user *_params)
1664{
1665 struct snd_timer_user *tu;
1666 struct snd_timer_params params;
1667 struct snd_timer *t;
1668 struct snd_timer_read *tr;
1669 struct snd_timer_tread *ttr;
1670 int err;
1671
1672 tu = file->private_data;
1673 if (!tu->timeri)
1674 return -EBADFD;
1675 t = tu->timeri->timer;
1676 if (!t)
1677 return -EBADFD;
1678 if (copy_from_user(&params, _params, sizeof(params)))
1679 return -EFAULT;
1680 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1681 err = -EINVAL;
1682 goto _end;
1683 }
1684 if (params.queue_size > 0 &&
1685 (params.queue_size < 32 || params.queue_size > 1024)) {
1686 err = -EINVAL;
1687 goto _end;
1688 }
1689 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1690 (1<<SNDRV_TIMER_EVENT_TICK)|
1691 (1<<SNDRV_TIMER_EVENT_START)|
1692 (1<<SNDRV_TIMER_EVENT_STOP)|
1693 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1694 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1695 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1696 (1<<SNDRV_TIMER_EVENT_RESUME)|
1697 (1<<SNDRV_TIMER_EVENT_MSTART)|
1698 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1699 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1700 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1701 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1702 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1703 err = -EINVAL;
1704 goto _end;
1705 }
1706 snd_timer_stop(tu->timeri);
1707 spin_lock_irq(&t->lock);
1708 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1709 SNDRV_TIMER_IFLG_EXCLUSIVE|
1710 SNDRV_TIMER_IFLG_EARLY_EVENT);
1711 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1712 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1713 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1714 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1715 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1716 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1717 spin_unlock_irq(&t->lock);
1718 if (params.queue_size > 0 &&
1719 (unsigned int)tu->queue_size != params.queue_size) {
1720 if (tu->tread) {
1721 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1722 GFP_KERNEL);
1723 if (ttr) {
1724 kfree(tu->tqueue);
1725 tu->queue_size = params.queue_size;
1726 tu->tqueue = ttr;
1727 }
1728 } else {
1729 tr = kmalloc(params.queue_size * sizeof(*tr),
1730 GFP_KERNEL);
1731 if (tr) {
1732 kfree(tu->queue);
1733 tu->queue_size = params.queue_size;
1734 tu->queue = tr;
1735 }
1736 }
1737 }
1738 tu->qhead = tu->qtail = tu->qused = 0;
1739 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1740 if (tu->tread) {
1741 struct snd_timer_tread tread;
1742 tread.event = SNDRV_TIMER_EVENT_EARLY;
1743 tread.tstamp.tv_sec = 0;
1744 tread.tstamp.tv_nsec = 0;
1745 tread.val = 0;
1746 snd_timer_user_append_to_tqueue(tu, &tread);
1747 } else {
1748 struct snd_timer_read *r = &tu->queue[0];
1749 r->resolution = 0;
1750 r->ticks = 0;
1751 tu->qused++;
1752 tu->qtail++;
1753 }
1754 }
1755 tu->filter = params.filter;
1756 tu->ticks = params.ticks;
1757 err = 0;
1758 _end:
1759 if (copy_to_user(_params, &params, sizeof(params)))
1760 return -EFAULT;
1761 return err;
1762}
1763
1764static int snd_timer_user_status(struct file *file,
1765 struct snd_timer_status __user *_status)
1766{
1767 struct snd_timer_user *tu;
1768 struct snd_timer_status status;
1769
1770 tu = file->private_data;
1771 if (!tu->timeri)
1772 return -EBADFD;
1773 memset(&status, 0, sizeof(status));
1774 status.tstamp = tu->tstamp;
1775 status.resolution = snd_timer_resolution(tu->timeri);
1776 status.lost = tu->timeri->lost;
1777 status.overrun = tu->overrun;
1778 spin_lock_irq(&tu->qlock);
1779 status.queue = tu->qused;
1780 spin_unlock_irq(&tu->qlock);
1781 if (copy_to_user(_status, &status, sizeof(status)))
1782 return -EFAULT;
1783 return 0;
1784}
1785
1786static int snd_timer_user_start(struct file *file)
1787{
1788 int err;
1789 struct snd_timer_user *tu;
1790
1791 tu = file->private_data;
1792 if (!tu->timeri)
1793 return -EBADFD;
1794 snd_timer_stop(tu->timeri);
1795 tu->timeri->lost = 0;
1796 tu->last_resolution = 0;
1797 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1798}
1799
1800static int snd_timer_user_stop(struct file *file)
1801{
1802 int err;
1803 struct snd_timer_user *tu;
1804
1805 tu = file->private_data;
1806 if (!tu->timeri)
1807 return -EBADFD;
1808 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1809}
1810
1811static int snd_timer_user_continue(struct file *file)
1812{
1813 int err;
1814 struct snd_timer_user *tu;
1815
1816 tu = file->private_data;
1817 if (!tu->timeri)
1818 return -EBADFD;
1819 tu->timeri->lost = 0;
1820 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1821}
1822
1823static int snd_timer_user_pause(struct file *file)
1824{
1825 int err;
1826 struct snd_timer_user *tu;
1827
1828 tu = file->private_data;
1829 if (!tu->timeri)
1830 return -EBADFD;
1831 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1832}
1833
1834enum {
1835 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1836 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1837 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1838 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1839};
1840
1841static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1842 unsigned long arg)
1843{
1844 struct snd_timer_user *tu;
1845 void __user *argp = (void __user *)arg;
1846 int __user *p = argp;
1847
1848 tu = file->private_data;
1849 switch (cmd) {
1850 case SNDRV_TIMER_IOCTL_PVERSION:
1851 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1852 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1853 return snd_timer_user_next_device(argp);
1854 case SNDRV_TIMER_IOCTL_TREAD:
1855 {
1856 int xarg;
1857
1858 if (tu->timeri) /* too late */
1859 return -EBUSY;
1860 if (get_user(xarg, p))
1861 return -EFAULT;
1862 tu->tread = xarg ? 1 : 0;
1863 return 0;
1864 }
1865 case SNDRV_TIMER_IOCTL_GINFO:
1866 return snd_timer_user_ginfo(file, argp);
1867 case SNDRV_TIMER_IOCTL_GPARAMS:
1868 return snd_timer_user_gparams(file, argp);
1869 case SNDRV_TIMER_IOCTL_GSTATUS:
1870 return snd_timer_user_gstatus(file, argp);
1871 case SNDRV_TIMER_IOCTL_SELECT:
1872 return snd_timer_user_tselect(file, argp);
1873 case SNDRV_TIMER_IOCTL_INFO:
1874 return snd_timer_user_info(file, argp);
1875 case SNDRV_TIMER_IOCTL_PARAMS:
1876 return snd_timer_user_params(file, argp);
1877 case SNDRV_TIMER_IOCTL_STATUS:
1878 return snd_timer_user_status(file, argp);
1879 case SNDRV_TIMER_IOCTL_START:
1880 case SNDRV_TIMER_IOCTL_START_OLD:
1881 return snd_timer_user_start(file);
1882 case SNDRV_TIMER_IOCTL_STOP:
1883 case SNDRV_TIMER_IOCTL_STOP_OLD:
1884 return snd_timer_user_stop(file);
1885 case SNDRV_TIMER_IOCTL_CONTINUE:
1886 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1887 return snd_timer_user_continue(file);
1888 case SNDRV_TIMER_IOCTL_PAUSE:
1889 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1890 return snd_timer_user_pause(file);
1891 }
1892 return -ENOTTY;
1893}
1894
1895static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1896 unsigned long arg)
1897{
1898 struct snd_timer_user *tu = file->private_data;
1899 long ret;
1900
1901 mutex_lock(&tu->ioctl_lock);
1902 ret = __snd_timer_user_ioctl(file, cmd, arg);
1903 mutex_unlock(&tu->ioctl_lock);
1904 return ret;
1905}
1906
1907static int snd_timer_user_fasync(int fd, struct file * file, int on)
1908{
1909 struct snd_timer_user *tu;
1910
1911 tu = file->private_data;
1912 return fasync_helper(fd, file, on, &tu->fasync);
1913}
1914
1915static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1916 size_t count, loff_t *offset)
1917{
1918 struct snd_timer_user *tu;
1919 long result = 0, unit;
1920 int qhead;
1921 int err = 0;
1922
1923 tu = file->private_data;
1924 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1925 spin_lock_irq(&tu->qlock);
1926 while ((long)count - result >= unit) {
1927 while (!tu->qused) {
1928 wait_queue_t wait;
1929
1930 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1931 err = -EAGAIN;
1932 goto _error;
1933 }
1934
1935 set_current_state(TASK_INTERRUPTIBLE);
1936 init_waitqueue_entry(&wait, current);
1937 add_wait_queue(&tu->qchange_sleep, &wait);
1938
1939 spin_unlock_irq(&tu->qlock);
1940 schedule();
1941 spin_lock_irq(&tu->qlock);
1942
1943 remove_wait_queue(&tu->qchange_sleep, &wait);
1944
1945 if (tu->disconnected) {
1946 err = -ENODEV;
1947 goto _error;
1948 }
1949 if (signal_pending(current)) {
1950 err = -ERESTARTSYS;
1951 goto _error;
1952 }
1953 }
1954
1955 qhead = tu->qhead++;
1956 tu->qhead %= tu->queue_size;
1957 spin_unlock_irq(&tu->qlock);
1958
1959 if (tu->tread) {
1960 if (copy_to_user(buffer, &tu->tqueue[qhead],
1961 sizeof(struct snd_timer_tread)))
1962 err = -EFAULT;
1963 } else {
1964 if (copy_to_user(buffer, &tu->queue[qhead],
1965 sizeof(struct snd_timer_read)))
1966 err = -EFAULT;
1967 }
1968
1969 spin_lock_irq(&tu->qlock);
1970 tu->qused--;
1971 if (err < 0)
1972 goto _error;
1973 result += unit;
1974 buffer += unit;
1975 }
1976 _error:
1977 spin_unlock_irq(&tu->qlock);
1978 return result > 0 ? result : err;
1979}
1980
1981static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1982{
1983 unsigned int mask;
1984 struct snd_timer_user *tu;
1985
1986 tu = file->private_data;
1987
1988 poll_wait(file, &tu->qchange_sleep, wait);
1989
1990 mask = 0;
1991 if (tu->qused)
1992 mask |= POLLIN | POLLRDNORM;
1993 if (tu->disconnected)
1994 mask |= POLLERR;
1995
1996 return mask;
1997}
1998
1999#ifdef CONFIG_COMPAT
2000#include "timer_compat.c"
2001#else
2002#define snd_timer_user_ioctl_compat NULL
2003#endif
2004
2005static const struct file_operations snd_timer_f_ops =
2006{
2007 .owner = THIS_MODULE,
2008 .read = snd_timer_user_read,
2009 .open = snd_timer_user_open,
2010 .release = snd_timer_user_release,
2011 .llseek = no_llseek,
2012 .poll = snd_timer_user_poll,
2013 .unlocked_ioctl = snd_timer_user_ioctl,
2014 .compat_ioctl = snd_timer_user_ioctl_compat,
2015 .fasync = snd_timer_user_fasync,
2016};
2017
2018/* unregister the system timer */
2019static void snd_timer_free_all(void)
2020{
2021 struct snd_timer *timer, *n;
2022
2023 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2024 snd_timer_free(timer);
2025}
2026
2027static struct device timer_dev;
2028
2029/*
2030 * ENTRY functions
2031 */
2032
2033static int __init alsa_timer_init(void)
2034{
2035 int err;
2036
2037 snd_device_initialize(&timer_dev, NULL);
2038 dev_set_name(&timer_dev, "timer");
2039
2040#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2041 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2042 "system timer");
2043#endif
2044
2045 err = snd_timer_register_system();
2046 if (err < 0) {
2047 pr_err("ALSA: unable to register system timer (%i)\n", err);
2048 put_device(&timer_dev);
2049 return err;
2050 }
2051
2052 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2053 &snd_timer_f_ops, NULL, &timer_dev);
2054 if (err < 0) {
2055 pr_err("ALSA: unable to register timer device (%i)\n", err);
2056 snd_timer_free_all();
2057 put_device(&timer_dev);
2058 return err;
2059 }
2060
2061 snd_timer_proc_init();
2062 return 0;
2063}
2064
2065static void __exit alsa_timer_exit(void)
2066{
2067 snd_unregister_device(&timer_dev);
2068 snd_timer_free_all();
2069 put_device(&timer_dev);
2070 snd_timer_proc_done();
2071#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2072 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2073#endif
2074}
2075
2076module_init(alsa_timer_init)
2077module_exit(alsa_timer_exit)
2078
2079EXPORT_SYMBOL(snd_timer_open);
2080EXPORT_SYMBOL(snd_timer_close);
2081EXPORT_SYMBOL(snd_timer_resolution);
2082EXPORT_SYMBOL(snd_timer_start);
2083EXPORT_SYMBOL(snd_timer_stop);
2084EXPORT_SYMBOL(snd_timer_continue);
2085EXPORT_SYMBOL(snd_timer_pause);
2086EXPORT_SYMBOL(snd_timer_new);
2087EXPORT_SYMBOL(snd_timer_notify);
2088EXPORT_SYMBOL(snd_timer_global_new);
2089EXPORT_SYMBOL(snd_timer_global_free);
2090EXPORT_SYMBOL(snd_timer_global_register);
2091EXPORT_SYMBOL(snd_timer_interrupt);
Linux 6.x block layer and io_uring tree(s)