2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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.
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.
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
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>
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
43 #define DEFAULT_TIMER_LIMIT 1
46 static int timer_limit = DEFAULT_TIMER_LIMIT;
47 static int timer_tstamp_monotonic = 1;
48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
49 MODULE_DESCRIPTION("ALSA timer interface");
50 MODULE_LICENSE("GPL");
51 module_param(timer_limit, int, 0444);
52 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
53 module_param(timer_tstamp_monotonic, int, 0444);
54 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
56 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
57 MODULE_ALIAS("devname:snd/timer");
59 struct snd_timer_user {
60 struct snd_timer_instance *timeri;
61 int tread; /* enhanced read with timestamps and events */
63 unsigned long overrun;
69 struct snd_timer_read *queue;
70 struct snd_timer_tread *tqueue;
72 unsigned long last_resolution;
74 struct timespec tstamp; /* trigger tstamp */
75 wait_queue_head_t qchange_sleep;
76 struct fasync_struct *fasync;
77 struct mutex ioctl_lock;
81 static LIST_HEAD(snd_timer_list);
83 /* list of slave instances */
84 static LIST_HEAD(snd_timer_slave_list);
86 /* lock for slave active lists */
87 static DEFINE_SPINLOCK(slave_active_lock);
89 static DEFINE_MUTEX(register_mutex);
91 static int snd_timer_free(struct snd_timer *timer);
92 static int snd_timer_dev_free(struct snd_device *device);
93 static int snd_timer_dev_register(struct snd_device *device);
94 static int snd_timer_dev_disconnect(struct snd_device *device);
96 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
99 * create a timer instance with the given owner string.
100 * when timer is not NULL, increments the module counter
102 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
103 struct snd_timer *timer)
105 struct snd_timer_instance *timeri;
106 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
109 timeri->owner = kstrdup(owner, GFP_KERNEL);
110 if (! timeri->owner) {
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);
120 timeri->timer = timer;
121 if (timer && !try_module_get(timer->module)) {
122 kfree(timeri->owner);
131 * find a timer instance from the given timer id
133 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
135 struct snd_timer *timer = NULL;
137 list_for_each_entry(timer, &snd_timer_list, device_list) {
138 if (timer->tmr_class != tid->dev_class)
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))
145 if (timer->tmr_device != tid->device)
147 if (timer->tmr_subdevice != tid->subdevice)
154 #ifdef CONFIG_MODULES
156 static void snd_timer_request(struct snd_timer_id *tid)
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);
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);
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.
179 * call this with register_mutex down.
181 static void snd_timer_check_slave(struct snd_timer_instance *slave)
183 struct snd_timer *timer;
184 struct snd_timer_instance *master;
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);
204 * look for slave instances matching with the slave id of the given master.
205 * when found, relink the open_link of slaves.
207 * call this with register_mutex down.
209 static void snd_timer_check_master(struct snd_timer_instance *master)
211 struct snd_timer_instance *slave, *tmp;
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);
232 * open a timer instance
233 * when opening a master, the slave id must be here given.
235 int snd_timer_open(struct snd_timer_instance **ti,
236 char *owner, struct snd_timer_id *tid,
237 unsigned int slave_id)
239 struct snd_timer *timer;
240 struct snd_timer_instance *timeri = NULL;
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",
250 mutex_lock(®ister_mutex);
251 timeri = snd_timer_instance_new(owner, NULL);
253 mutex_unlock(®ister_mutex);
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(®ister_mutex);
266 /* open a master instance */
267 mutex_lock(®ister_mutex);
268 timer = snd_timer_find(tid);
269 #ifdef CONFIG_MODULES
271 mutex_unlock(®ister_mutex);
272 snd_timer_request(tid);
273 mutex_lock(®ister_mutex);
274 timer = snd_timer_find(tid);
278 mutex_unlock(®ister_mutex);
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(®ister_mutex);
289 timeri = snd_timer_instance_new(owner, timer);
291 mutex_unlock(®ister_mutex);
294 /* take a card refcount for safe disconnection */
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(®ister_mutex);
308 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event);
311 * close a timer instance
313 int snd_timer_close(struct snd_timer_instance *timeri)
315 struct snd_timer *timer = NULL;
316 struct snd_timer_instance *slave, *tmp;
318 if (snd_BUG_ON(!timeri))
321 /* force to stop the timer */
322 snd_timer_stop(timeri);
324 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
325 /* wait, until the active callback is finished */
326 spin_lock_irq(&slave_active_lock);
327 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
328 spin_unlock_irq(&slave_active_lock);
330 spin_lock_irq(&slave_active_lock);
332 spin_unlock_irq(&slave_active_lock);
333 mutex_lock(®ister_mutex);
334 list_del(&timeri->open_list);
335 mutex_unlock(®ister_mutex);
337 timer = timeri->timer;
338 if (snd_BUG_ON(!timer))
340 /* wait, until the active callback is finished */
341 spin_lock_irq(&timer->lock);
342 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
343 spin_unlock_irq(&timer->lock);
345 spin_lock_irq(&timer->lock);
347 spin_unlock_irq(&timer->lock);
348 mutex_lock(®ister_mutex);
349 list_del(&timeri->open_list);
350 if (list_empty(&timer->open_list_head) &&
352 timer->hw.close(timer);
353 /* remove slave links */
354 spin_lock_irq(&slave_active_lock);
355 spin_lock(&timer->lock);
356 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
358 list_move_tail(&slave->open_list, &snd_timer_slave_list);
359 slave->master = NULL;
361 list_del_init(&slave->ack_list);
362 list_del_init(&slave->active_list);
364 spin_unlock(&timer->lock);
365 spin_unlock_irq(&slave_active_lock);
366 /* release a card refcount for safe disconnection */
368 put_device(&timer->card->card_dev);
369 mutex_unlock(®ister_mutex);
372 if (timeri->private_free)
373 timeri->private_free(timeri);
374 kfree(timeri->owner);
377 module_put(timer->module);
381 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
383 struct snd_timer * timer;
387 if ((timer = timeri->timer) != NULL) {
388 if (timer->hw.c_resolution)
389 return timer->hw.c_resolution(timer);
390 return timer->hw.resolution;
395 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
397 struct snd_timer *timer;
399 unsigned long resolution = 0;
400 struct snd_timer_instance *ts;
401 struct timespec tstamp;
403 if (timer_tstamp_monotonic)
404 ktime_get_ts(&tstamp);
406 getnstimeofday(&tstamp);
407 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
408 event > SNDRV_TIMER_EVENT_PAUSE))
410 if (event == SNDRV_TIMER_EVENT_START ||
411 event == SNDRV_TIMER_EVENT_CONTINUE)
412 resolution = snd_timer_resolution(ti);
414 ti->ccallback(ti, event, &tstamp, resolution);
415 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
420 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
422 spin_lock_irqsave(&timer->lock, flags);
423 list_for_each_entry(ts, &ti->slave_active_head, active_list)
425 ts->ccallback(ti, event + 100, &tstamp, resolution);
426 spin_unlock_irqrestore(&timer->lock, flags);
429 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
430 unsigned long sticks)
432 list_move_tail(&timeri->active_list, &timer->active_list_head);
433 if (timer->running) {
434 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
436 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
437 timeri->flags |= SNDRV_TIMER_IFLG_START;
438 return 1; /* delayed start */
440 timer->sticks = sticks;
441 timer->hw.start(timer);
444 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
449 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
453 spin_lock_irqsave(&slave_active_lock, flags);
454 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
455 spin_unlock_irqrestore(&slave_active_lock, flags);
458 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
459 if (timeri->master && timeri->timer) {
460 spin_lock(&timeri->timer->lock);
461 list_add_tail(&timeri->active_list,
462 &timeri->master->slave_active_head);
463 spin_unlock(&timeri->timer->lock);
465 spin_unlock_irqrestore(&slave_active_lock, flags);
466 return 1; /* delayed start */
470 * start the timer instance
472 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
474 struct snd_timer *timer;
475 int result = -EINVAL;
478 if (timeri == NULL || ticks < 1)
480 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
481 result = snd_timer_start_slave(timeri);
483 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
486 timer = timeri->timer;
489 if (timer->card && timer->card->shutdown)
491 spin_lock_irqsave(&timer->lock, flags);
492 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
493 SNDRV_TIMER_IFLG_START)) {
497 timeri->ticks = timeri->cticks = ticks;
499 result = snd_timer_start1(timer, timeri, ticks);
501 spin_unlock_irqrestore(&timer->lock, flags);
503 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
507 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event)
509 struct snd_timer *timer;
512 if (snd_BUG_ON(!timeri))
515 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
516 spin_lock_irqsave(&slave_active_lock, flags);
517 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
518 spin_unlock_irqrestore(&slave_active_lock, flags);
521 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
522 list_del_init(&timeri->ack_list);
523 list_del_init(&timeri->active_list);
524 spin_unlock_irqrestore(&slave_active_lock, flags);
527 timer = timeri->timer;
530 spin_lock_irqsave(&timer->lock, flags);
531 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
532 SNDRV_TIMER_IFLG_START))) {
533 spin_unlock_irqrestore(&timer->lock, flags);
536 list_del_init(&timeri->ack_list);
537 list_del_init(&timeri->active_list);
538 if (timer->card && timer->card->shutdown) {
539 spin_unlock_irqrestore(&timer->lock, flags);
542 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
543 !(--timer->running)) {
544 timer->hw.stop(timer);
545 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
546 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
547 snd_timer_reschedule(timer, 0);
548 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
549 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
550 timer->hw.start(timer);
554 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
555 spin_unlock_irqrestore(&timer->lock, flags);
557 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
558 snd_timer_notify1(timeri, event);
563 * stop the timer instance.
565 * do not call this from the timer callback!
567 int snd_timer_stop(struct snd_timer_instance *timeri)
569 struct snd_timer *timer;
573 err = _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_STOP);
576 timer = timeri->timer;
579 spin_lock_irqsave(&timer->lock, flags);
580 timeri->cticks = timeri->ticks;
582 spin_unlock_irqrestore(&timer->lock, flags);
587 * start again.. the tick is kept.
589 int snd_timer_continue(struct snd_timer_instance *timeri)
591 struct snd_timer *timer;
592 int result = -EINVAL;
597 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
598 return snd_timer_start_slave(timeri);
599 timer = timeri->timer;
602 if (timer->card && timer->card->shutdown)
604 spin_lock_irqsave(&timer->lock, flags);
605 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
612 result = snd_timer_start1(timer, timeri, timer->sticks);
614 spin_unlock_irqrestore(&timer->lock, flags);
615 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
620 * pause.. remember the ticks left
622 int snd_timer_pause(struct snd_timer_instance * timeri)
624 return _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_PAUSE);
628 * reschedule the timer
630 * start pending instances and check the scheduling ticks.
631 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
633 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
635 struct snd_timer_instance *ti;
636 unsigned long ticks = ~0UL;
638 list_for_each_entry(ti, &timer->active_list_head, active_list) {
639 if (ti->flags & SNDRV_TIMER_IFLG_START) {
640 ti->flags &= ~SNDRV_TIMER_IFLG_START;
641 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
644 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
645 if (ticks > ti->cticks)
650 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
653 if (ticks > timer->hw.ticks)
654 ticks = timer->hw.ticks;
655 if (ticks_left != ticks)
656 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
657 timer->sticks = ticks;
664 static void snd_timer_tasklet(unsigned long arg)
666 struct snd_timer *timer = (struct snd_timer *) arg;
667 struct snd_timer_instance *ti;
669 unsigned long resolution, ticks;
672 if (timer->card && timer->card->shutdown)
675 spin_lock_irqsave(&timer->lock, flags);
676 /* now process all callbacks */
677 while (!list_empty(&timer->sack_list_head)) {
678 p = timer->sack_list_head.next; /* get first item */
679 ti = list_entry(p, struct snd_timer_instance, ack_list);
681 /* remove from ack_list and make empty */
686 resolution = ti->resolution;
688 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
689 spin_unlock(&timer->lock);
691 ti->callback(ti, resolution, ticks);
692 spin_lock(&timer->lock);
693 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
695 spin_unlock_irqrestore(&timer->lock, flags);
701 * ticks_left is usually equal to timer->sticks.
704 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
706 struct snd_timer_instance *ti, *ts, *tmp;
707 unsigned long resolution, ticks;
708 struct list_head *p, *ack_list_head;
715 if (timer->card && timer->card->shutdown)
718 spin_lock_irqsave(&timer->lock, flags);
720 /* remember the current resolution */
721 if (timer->hw.c_resolution)
722 resolution = timer->hw.c_resolution(timer);
724 resolution = timer->hw.resolution;
726 /* loop for all active instances
727 * Here we cannot use list_for_each_entry because the active_list of a
728 * processed instance is relinked to done_list_head before the callback
731 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
733 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
735 ti->pticks += ticks_left;
736 ti->resolution = resolution;
737 if (ti->cticks < ticks_left)
740 ti->cticks -= ticks_left;
741 if (ti->cticks) /* not expired */
743 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
744 ti->cticks = ti->ticks;
746 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
748 list_del_init(&ti->active_list);
750 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
751 (ti->flags & SNDRV_TIMER_IFLG_FAST))
752 ack_list_head = &timer->ack_list_head;
754 ack_list_head = &timer->sack_list_head;
755 if (list_empty(&ti->ack_list))
756 list_add_tail(&ti->ack_list, ack_list_head);
757 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
758 ts->pticks = ti->pticks;
759 ts->resolution = resolution;
760 if (list_empty(&ts->ack_list))
761 list_add_tail(&ts->ack_list, ack_list_head);
764 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
765 snd_timer_reschedule(timer, timer->sticks);
766 if (timer->running) {
767 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
768 timer->hw.stop(timer);
769 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
771 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
772 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
774 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
775 timer->hw.start(timer);
778 timer->hw.stop(timer);
781 /* now process all fast callbacks */
782 while (!list_empty(&timer->ack_list_head)) {
783 p = timer->ack_list_head.next; /* get first item */
784 ti = list_entry(p, struct snd_timer_instance, ack_list);
786 /* remove from ack_list and make empty */
792 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
793 spin_unlock(&timer->lock);
795 ti->callback(ti, resolution, ticks);
796 spin_lock(&timer->lock);
797 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
800 /* do we have any slow callbacks? */
801 use_tasklet = !list_empty(&timer->sack_list_head);
802 spin_unlock_irqrestore(&timer->lock, flags);
805 tasklet_schedule(&timer->task_queue);
812 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
813 struct snd_timer **rtimer)
815 struct snd_timer *timer;
817 static struct snd_device_ops ops = {
818 .dev_free = snd_timer_dev_free,
819 .dev_register = snd_timer_dev_register,
820 .dev_disconnect = snd_timer_dev_disconnect,
823 if (snd_BUG_ON(!tid))
827 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
830 timer->tmr_class = tid->dev_class;
832 timer->tmr_device = tid->device;
833 timer->tmr_subdevice = tid->subdevice;
835 strlcpy(timer->id, id, sizeof(timer->id));
836 INIT_LIST_HEAD(&timer->device_list);
837 INIT_LIST_HEAD(&timer->open_list_head);
838 INIT_LIST_HEAD(&timer->active_list_head);
839 INIT_LIST_HEAD(&timer->ack_list_head);
840 INIT_LIST_HEAD(&timer->sack_list_head);
841 spin_lock_init(&timer->lock);
842 tasklet_init(&timer->task_queue, snd_timer_tasklet,
843 (unsigned long)timer);
845 timer->module = card->module;
846 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
848 snd_timer_free(timer);
857 static int snd_timer_free(struct snd_timer *timer)
862 mutex_lock(®ister_mutex);
863 if (! list_empty(&timer->open_list_head)) {
864 struct list_head *p, *n;
865 struct snd_timer_instance *ti;
866 pr_warn("ALSA: timer %p is busy?\n", timer);
867 list_for_each_safe(p, n, &timer->open_list_head) {
869 ti = list_entry(p, struct snd_timer_instance, open_list);
873 list_del(&timer->device_list);
874 mutex_unlock(®ister_mutex);
876 if (timer->private_free)
877 timer->private_free(timer);
882 static int snd_timer_dev_free(struct snd_device *device)
884 struct snd_timer *timer = device->device_data;
885 return snd_timer_free(timer);
888 static int snd_timer_dev_register(struct snd_device *dev)
890 struct snd_timer *timer = dev->device_data;
891 struct snd_timer *timer1;
893 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
895 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
896 !timer->hw.resolution && timer->hw.c_resolution == NULL)
899 mutex_lock(®ister_mutex);
900 list_for_each_entry(timer1, &snd_timer_list, device_list) {
901 if (timer1->tmr_class > timer->tmr_class)
903 if (timer1->tmr_class < timer->tmr_class)
905 if (timer1->card && timer->card) {
906 if (timer1->card->number > timer->card->number)
908 if (timer1->card->number < timer->card->number)
911 if (timer1->tmr_device > timer->tmr_device)
913 if (timer1->tmr_device < timer->tmr_device)
915 if (timer1->tmr_subdevice > timer->tmr_subdevice)
917 if (timer1->tmr_subdevice < timer->tmr_subdevice)
920 mutex_unlock(®ister_mutex);
923 list_add_tail(&timer->device_list, &timer1->device_list);
924 mutex_unlock(®ister_mutex);
928 /* just for reference in snd_timer_dev_disconnect() below */
929 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
930 int event, struct timespec *tstamp,
931 unsigned long resolution);
933 static int snd_timer_dev_disconnect(struct snd_device *device)
935 struct snd_timer *timer = device->device_data;
936 struct snd_timer_instance *ti;
938 mutex_lock(®ister_mutex);
939 list_del_init(&timer->device_list);
940 /* wake up pending sleepers */
941 list_for_each_entry(ti, &timer->open_list_head, open_list) {
942 /* FIXME: better to have a ti.disconnect() op */
943 if (ti->ccallback == snd_timer_user_ccallback) {
944 struct snd_timer_user *tu = ti->callback_data;
946 tu->disconnected = true;
947 wake_up(&tu->qchange_sleep);
950 mutex_unlock(®ister_mutex);
954 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
957 unsigned long resolution = 0;
958 struct snd_timer_instance *ti, *ts;
960 if (timer->card && timer->card->shutdown)
962 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
964 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
965 event > SNDRV_TIMER_EVENT_MRESUME))
967 spin_lock_irqsave(&timer->lock, flags);
968 if (event == SNDRV_TIMER_EVENT_MSTART ||
969 event == SNDRV_TIMER_EVENT_MCONTINUE ||
970 event == SNDRV_TIMER_EVENT_MRESUME) {
971 if (timer->hw.c_resolution)
972 resolution = timer->hw.c_resolution(timer);
974 resolution = timer->hw.resolution;
976 list_for_each_entry(ti, &timer->active_list_head, active_list) {
978 ti->ccallback(ti, event, tstamp, resolution);
979 list_for_each_entry(ts, &ti->slave_active_head, active_list)
981 ts->ccallback(ts, event, tstamp, resolution);
983 spin_unlock_irqrestore(&timer->lock, flags);
987 * exported functions for global timers
989 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
991 struct snd_timer_id tid;
993 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
994 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
998 return snd_timer_new(NULL, id, &tid, rtimer);
1001 int snd_timer_global_free(struct snd_timer *timer)
1003 return snd_timer_free(timer);
1006 int snd_timer_global_register(struct snd_timer *timer)
1008 struct snd_device dev;
1010 memset(&dev, 0, sizeof(dev));
1011 dev.device_data = timer;
1012 return snd_timer_dev_register(&dev);
1019 struct snd_timer_system_private {
1020 struct timer_list tlist;
1021 unsigned long last_expires;
1022 unsigned long last_jiffies;
1023 unsigned long correction;
1026 static void snd_timer_s_function(unsigned long data)
1028 struct snd_timer *timer = (struct snd_timer *)data;
1029 struct snd_timer_system_private *priv = timer->private_data;
1030 unsigned long jiff = jiffies;
1031 if (time_after(jiff, priv->last_expires))
1032 priv->correction += (long)jiff - (long)priv->last_expires;
1033 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1036 static int snd_timer_s_start(struct snd_timer * timer)
1038 struct snd_timer_system_private *priv;
1039 unsigned long njiff;
1041 priv = (struct snd_timer_system_private *) timer->private_data;
1042 njiff = (priv->last_jiffies = jiffies);
1043 if (priv->correction > timer->sticks - 1) {
1044 priv->correction -= timer->sticks - 1;
1047 njiff += timer->sticks - priv->correction;
1048 priv->correction = 0;
1050 priv->last_expires = priv->tlist.expires = njiff;
1051 add_timer(&priv->tlist);
1055 static int snd_timer_s_stop(struct snd_timer * timer)
1057 struct snd_timer_system_private *priv;
1060 priv = (struct snd_timer_system_private *) timer->private_data;
1061 del_timer(&priv->tlist);
1063 if (time_before(jiff, priv->last_expires))
1064 timer->sticks = priv->last_expires - jiff;
1067 priv->correction = 0;
1071 static struct snd_timer_hardware snd_timer_system =
1073 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1074 .resolution = 1000000000L / HZ,
1076 .start = snd_timer_s_start,
1077 .stop = snd_timer_s_stop
1080 static void snd_timer_free_system(struct snd_timer *timer)
1082 kfree(timer->private_data);
1085 static int snd_timer_register_system(void)
1087 struct snd_timer *timer;
1088 struct snd_timer_system_private *priv;
1091 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1094 strcpy(timer->name, "system timer");
1095 timer->hw = snd_timer_system;
1096 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1098 snd_timer_free(timer);
1101 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1102 timer->private_data = priv;
1103 timer->private_free = snd_timer_free_system;
1104 return snd_timer_global_register(timer);
1107 #ifdef CONFIG_SND_PROC_FS
1112 static void snd_timer_proc_read(struct snd_info_entry *entry,
1113 struct snd_info_buffer *buffer)
1115 struct snd_timer *timer;
1116 struct snd_timer_instance *ti;
1118 mutex_lock(®ister_mutex);
1119 list_for_each_entry(timer, &snd_timer_list, device_list) {
1120 if (timer->card && timer->card->shutdown)
1122 switch (timer->tmr_class) {
1123 case SNDRV_TIMER_CLASS_GLOBAL:
1124 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1126 case SNDRV_TIMER_CLASS_CARD:
1127 snd_iprintf(buffer, "C%i-%i: ",
1128 timer->card->number, timer->tmr_device);
1130 case SNDRV_TIMER_CLASS_PCM:
1131 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1132 timer->tmr_device, timer->tmr_subdevice);
1135 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1136 timer->card ? timer->card->number : -1,
1137 timer->tmr_device, timer->tmr_subdevice);
1139 snd_iprintf(buffer, "%s :", timer->name);
1140 if (timer->hw.resolution)
1141 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1142 timer->hw.resolution / 1000,
1143 timer->hw.resolution % 1000,
1145 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1146 snd_iprintf(buffer, " SLAVE");
1147 snd_iprintf(buffer, "\n");
1148 list_for_each_entry(ti, &timer->open_list_head, open_list)
1149 snd_iprintf(buffer, " Client %s : %s\n",
1150 ti->owner ? ti->owner : "unknown",
1151 ti->flags & (SNDRV_TIMER_IFLG_START |
1152 SNDRV_TIMER_IFLG_RUNNING)
1153 ? "running" : "stopped");
1155 mutex_unlock(®ister_mutex);
1158 static struct snd_info_entry *snd_timer_proc_entry;
1160 static void __init snd_timer_proc_init(void)
1162 struct snd_info_entry *entry;
1164 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1165 if (entry != NULL) {
1166 entry->c.text.read = snd_timer_proc_read;
1167 if (snd_info_register(entry) < 0) {
1168 snd_info_free_entry(entry);
1172 snd_timer_proc_entry = entry;
1175 static void __exit snd_timer_proc_done(void)
1177 snd_info_free_entry(snd_timer_proc_entry);
1179 #else /* !CONFIG_SND_PROC_FS */
1180 #define snd_timer_proc_init()
1181 #define snd_timer_proc_done()
1185 * USER SPACE interface
1188 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1189 unsigned long resolution,
1190 unsigned long ticks)
1192 struct snd_timer_user *tu = timeri->callback_data;
1193 struct snd_timer_read *r;
1196 spin_lock(&tu->qlock);
1197 if (tu->qused > 0) {
1198 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1199 r = &tu->queue[prev];
1200 if (r->resolution == resolution) {
1205 if (tu->qused >= tu->queue_size) {
1208 r = &tu->queue[tu->qtail++];
1209 tu->qtail %= tu->queue_size;
1210 r->resolution = resolution;
1215 spin_unlock(&tu->qlock);
1216 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1217 wake_up(&tu->qchange_sleep);
1220 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1221 struct snd_timer_tread *tread)
1223 if (tu->qused >= tu->queue_size) {
1226 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1227 tu->qtail %= tu->queue_size;
1232 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1234 struct timespec *tstamp,
1235 unsigned long resolution)
1237 struct snd_timer_user *tu = timeri->callback_data;
1238 struct snd_timer_tread r1;
1239 unsigned long flags;
1241 if (event >= SNDRV_TIMER_EVENT_START &&
1242 event <= SNDRV_TIMER_EVENT_PAUSE)
1243 tu->tstamp = *tstamp;
1244 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1247 r1.tstamp = *tstamp;
1248 r1.val = resolution;
1249 spin_lock_irqsave(&tu->qlock, flags);
1250 snd_timer_user_append_to_tqueue(tu, &r1);
1251 spin_unlock_irqrestore(&tu->qlock, flags);
1252 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1253 wake_up(&tu->qchange_sleep);
1256 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1257 unsigned long resolution,
1258 unsigned long ticks)
1260 struct snd_timer_user *tu = timeri->callback_data;
1261 struct snd_timer_tread *r, r1;
1262 struct timespec tstamp;
1263 int prev, append = 0;
1265 memset(&tstamp, 0, sizeof(tstamp));
1266 spin_lock(&tu->qlock);
1267 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1268 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1269 spin_unlock(&tu->qlock);
1272 if (tu->last_resolution != resolution || ticks > 0) {
1273 if (timer_tstamp_monotonic)
1274 ktime_get_ts(&tstamp);
1276 getnstimeofday(&tstamp);
1278 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1279 tu->last_resolution != resolution) {
1280 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1282 r1.val = resolution;
1283 snd_timer_user_append_to_tqueue(tu, &r1);
1284 tu->last_resolution = resolution;
1287 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1291 if (tu->qused > 0) {
1292 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1293 r = &tu->tqueue[prev];
1294 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1301 r1.event = SNDRV_TIMER_EVENT_TICK;
1304 snd_timer_user_append_to_tqueue(tu, &r1);
1307 spin_unlock(&tu->qlock);
1310 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1311 wake_up(&tu->qchange_sleep);
1314 static int snd_timer_user_open(struct inode *inode, struct file *file)
1316 struct snd_timer_user *tu;
1319 err = nonseekable_open(inode, file);
1323 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1326 spin_lock_init(&tu->qlock);
1327 init_waitqueue_head(&tu->qchange_sleep);
1328 mutex_init(&tu->ioctl_lock);
1330 tu->queue_size = 128;
1331 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1333 if (tu->queue == NULL) {
1337 file->private_data = tu;
1341 static int snd_timer_user_release(struct inode *inode, struct file *file)
1343 struct snd_timer_user *tu;
1345 if (file->private_data) {
1346 tu = file->private_data;
1347 file->private_data = NULL;
1348 mutex_lock(&tu->ioctl_lock);
1350 snd_timer_close(tu->timeri);
1351 mutex_unlock(&tu->ioctl_lock);
1359 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1361 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1362 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1368 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1370 id->dev_class = timer->tmr_class;
1371 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1372 id->card = timer->card ? timer->card->number : -1;
1373 id->device = timer->tmr_device;
1374 id->subdevice = timer->tmr_subdevice;
1377 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1379 struct snd_timer_id id;
1380 struct snd_timer *timer;
1381 struct list_head *p;
1383 if (copy_from_user(&id, _tid, sizeof(id)))
1385 mutex_lock(®ister_mutex);
1386 if (id.dev_class < 0) { /* first item */
1387 if (list_empty(&snd_timer_list))
1388 snd_timer_user_zero_id(&id);
1390 timer = list_entry(snd_timer_list.next,
1391 struct snd_timer, device_list);
1392 snd_timer_user_copy_id(&id, timer);
1395 switch (id.dev_class) {
1396 case SNDRV_TIMER_CLASS_GLOBAL:
1397 id.device = id.device < 0 ? 0 : id.device + 1;
1398 list_for_each(p, &snd_timer_list) {
1399 timer = list_entry(p, struct snd_timer, device_list);
1400 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1401 snd_timer_user_copy_id(&id, timer);
1404 if (timer->tmr_device >= id.device) {
1405 snd_timer_user_copy_id(&id, timer);
1409 if (p == &snd_timer_list)
1410 snd_timer_user_zero_id(&id);
1412 case SNDRV_TIMER_CLASS_CARD:
1413 case SNDRV_TIMER_CLASS_PCM:
1420 if (id.device < 0) {
1423 if (id.subdevice < 0) {
1431 list_for_each(p, &snd_timer_list) {
1432 timer = list_entry(p, struct snd_timer, device_list);
1433 if (timer->tmr_class > id.dev_class) {
1434 snd_timer_user_copy_id(&id, timer);
1437 if (timer->tmr_class < id.dev_class)
1439 if (timer->card->number > id.card) {
1440 snd_timer_user_copy_id(&id, timer);
1443 if (timer->card->number < id.card)
1445 if (timer->tmr_device > id.device) {
1446 snd_timer_user_copy_id(&id, timer);
1449 if (timer->tmr_device < id.device)
1451 if (timer->tmr_subdevice > id.subdevice) {
1452 snd_timer_user_copy_id(&id, timer);
1455 if (timer->tmr_subdevice < id.subdevice)
1457 snd_timer_user_copy_id(&id, timer);
1460 if (p == &snd_timer_list)
1461 snd_timer_user_zero_id(&id);
1464 snd_timer_user_zero_id(&id);
1467 mutex_unlock(®ister_mutex);
1468 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1473 static int snd_timer_user_ginfo(struct file *file,
1474 struct snd_timer_ginfo __user *_ginfo)
1476 struct snd_timer_ginfo *ginfo;
1477 struct snd_timer_id tid;
1478 struct snd_timer *t;
1479 struct list_head *p;
1482 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1484 return PTR_ERR(ginfo);
1487 memset(ginfo, 0, sizeof(*ginfo));
1489 mutex_lock(®ister_mutex);
1490 t = snd_timer_find(&tid);
1492 ginfo->card = t->card ? t->card->number : -1;
1493 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1494 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1495 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1496 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1497 ginfo->resolution = t->hw.resolution;
1498 if (t->hw.resolution_min > 0) {
1499 ginfo->resolution_min = t->hw.resolution_min;
1500 ginfo->resolution_max = t->hw.resolution_max;
1502 list_for_each(p, &t->open_list_head) {
1508 mutex_unlock(®ister_mutex);
1509 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1515 static int snd_timer_user_gparams(struct file *file,
1516 struct snd_timer_gparams __user *_gparams)
1518 struct snd_timer_gparams gparams;
1519 struct snd_timer *t;
1522 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1524 mutex_lock(®ister_mutex);
1525 t = snd_timer_find(&gparams.tid);
1530 if (!list_empty(&t->open_list_head)) {
1534 if (!t->hw.set_period) {
1538 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1540 mutex_unlock(®ister_mutex);
1544 static int snd_timer_user_gstatus(struct file *file,
1545 struct snd_timer_gstatus __user *_gstatus)
1547 struct snd_timer_gstatus gstatus;
1548 struct snd_timer_id tid;
1549 struct snd_timer *t;
1552 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1555 memset(&gstatus, 0, sizeof(gstatus));
1557 mutex_lock(®ister_mutex);
1558 t = snd_timer_find(&tid);
1560 if (t->hw.c_resolution)
1561 gstatus.resolution = t->hw.c_resolution(t);
1563 gstatus.resolution = t->hw.resolution;
1564 if (t->hw.precise_resolution) {
1565 t->hw.precise_resolution(t, &gstatus.resolution_num,
1566 &gstatus.resolution_den);
1568 gstatus.resolution_num = gstatus.resolution;
1569 gstatus.resolution_den = 1000000000uL;
1574 mutex_unlock(®ister_mutex);
1575 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1580 static int snd_timer_user_tselect(struct file *file,
1581 struct snd_timer_select __user *_tselect)
1583 struct snd_timer_user *tu;
1584 struct snd_timer_select tselect;
1588 tu = file->private_data;
1590 snd_timer_close(tu->timeri);
1593 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1597 sprintf(str, "application %i", current->pid);
1598 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1599 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1600 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1609 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1611 if (tu->tqueue == NULL)
1614 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1616 if (tu->queue == NULL)
1621 snd_timer_close(tu->timeri);
1624 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1625 tu->timeri->callback = tu->tread
1626 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1627 tu->timeri->ccallback = snd_timer_user_ccallback;
1628 tu->timeri->callback_data = (void *)tu;
1635 static int snd_timer_user_info(struct file *file,
1636 struct snd_timer_info __user *_info)
1638 struct snd_timer_user *tu;
1639 struct snd_timer_info *info;
1640 struct snd_timer *t;
1643 tu = file->private_data;
1646 t = tu->timeri->timer;
1650 info = kzalloc(sizeof(*info), GFP_KERNEL);
1653 info->card = t->card ? t->card->number : -1;
1654 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1655 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1656 strlcpy(info->id, t->id, sizeof(info->id));
1657 strlcpy(info->name, t->name, sizeof(info->name));
1658 info->resolution = t->hw.resolution;
1659 if (copy_to_user(_info, info, sizeof(*_info)))
1665 static int snd_timer_user_params(struct file *file,
1666 struct snd_timer_params __user *_params)
1668 struct snd_timer_user *tu;
1669 struct snd_timer_params params;
1670 struct snd_timer *t;
1671 struct snd_timer_read *tr;
1672 struct snd_timer_tread *ttr;
1675 tu = file->private_data;
1678 t = tu->timeri->timer;
1681 if (copy_from_user(¶ms, _params, sizeof(params)))
1683 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1687 if (params.queue_size > 0 &&
1688 (params.queue_size < 32 || params.queue_size > 1024)) {
1692 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1693 (1<<SNDRV_TIMER_EVENT_TICK)|
1694 (1<<SNDRV_TIMER_EVENT_START)|
1695 (1<<SNDRV_TIMER_EVENT_STOP)|
1696 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1697 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1698 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1699 (1<<SNDRV_TIMER_EVENT_RESUME)|
1700 (1<<SNDRV_TIMER_EVENT_MSTART)|
1701 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1702 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1703 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1704 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1705 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1709 snd_timer_stop(tu->timeri);
1710 spin_lock_irq(&t->lock);
1711 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1712 SNDRV_TIMER_IFLG_EXCLUSIVE|
1713 SNDRV_TIMER_IFLG_EARLY_EVENT);
1714 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1715 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1716 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1717 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1718 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1719 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1720 spin_unlock_irq(&t->lock);
1721 if (params.queue_size > 0 &&
1722 (unsigned int)tu->queue_size != params.queue_size) {
1724 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1728 tu->queue_size = params.queue_size;
1732 tr = kmalloc(params.queue_size * sizeof(*tr),
1736 tu->queue_size = params.queue_size;
1741 tu->qhead = tu->qtail = tu->qused = 0;
1742 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1744 struct snd_timer_tread tread;
1745 tread.event = SNDRV_TIMER_EVENT_EARLY;
1746 tread.tstamp.tv_sec = 0;
1747 tread.tstamp.tv_nsec = 0;
1749 snd_timer_user_append_to_tqueue(tu, &tread);
1751 struct snd_timer_read *r = &tu->queue[0];
1758 tu->filter = params.filter;
1759 tu->ticks = params.ticks;
1762 if (copy_to_user(_params, ¶ms, sizeof(params)))
1767 static int snd_timer_user_status(struct file *file,
1768 struct snd_timer_status __user *_status)
1770 struct snd_timer_user *tu;
1771 struct snd_timer_status status;
1773 tu = file->private_data;
1776 memset(&status, 0, sizeof(status));
1777 status.tstamp = tu->tstamp;
1778 status.resolution = snd_timer_resolution(tu->timeri);
1779 status.lost = tu->timeri->lost;
1780 status.overrun = tu->overrun;
1781 spin_lock_irq(&tu->qlock);
1782 status.queue = tu->qused;
1783 spin_unlock_irq(&tu->qlock);
1784 if (copy_to_user(_status, &status, sizeof(status)))
1789 static int snd_timer_user_start(struct file *file)
1792 struct snd_timer_user *tu;
1794 tu = file->private_data;
1797 snd_timer_stop(tu->timeri);
1798 tu->timeri->lost = 0;
1799 tu->last_resolution = 0;
1800 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1803 static int snd_timer_user_stop(struct file *file)
1806 struct snd_timer_user *tu;
1808 tu = file->private_data;
1811 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1814 static int snd_timer_user_continue(struct file *file)
1817 struct snd_timer_user *tu;
1819 tu = file->private_data;
1822 tu->timeri->lost = 0;
1823 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1826 static int snd_timer_user_pause(struct file *file)
1829 struct snd_timer_user *tu;
1831 tu = file->private_data;
1834 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1838 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1839 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1840 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1841 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1844 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1847 struct snd_timer_user *tu;
1848 void __user *argp = (void __user *)arg;
1849 int __user *p = argp;
1851 tu = file->private_data;
1853 case SNDRV_TIMER_IOCTL_PVERSION:
1854 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1855 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1856 return snd_timer_user_next_device(argp);
1857 case SNDRV_TIMER_IOCTL_TREAD:
1861 if (tu->timeri) /* too late */
1863 if (get_user(xarg, p))
1865 tu->tread = xarg ? 1 : 0;
1868 case SNDRV_TIMER_IOCTL_GINFO:
1869 return snd_timer_user_ginfo(file, argp);
1870 case SNDRV_TIMER_IOCTL_GPARAMS:
1871 return snd_timer_user_gparams(file, argp);
1872 case SNDRV_TIMER_IOCTL_GSTATUS:
1873 return snd_timer_user_gstatus(file, argp);
1874 case SNDRV_TIMER_IOCTL_SELECT:
1875 return snd_timer_user_tselect(file, argp);
1876 case SNDRV_TIMER_IOCTL_INFO:
1877 return snd_timer_user_info(file, argp);
1878 case SNDRV_TIMER_IOCTL_PARAMS:
1879 return snd_timer_user_params(file, argp);
1880 case SNDRV_TIMER_IOCTL_STATUS:
1881 return snd_timer_user_status(file, argp);
1882 case SNDRV_TIMER_IOCTL_START:
1883 case SNDRV_TIMER_IOCTL_START_OLD:
1884 return snd_timer_user_start(file);
1885 case SNDRV_TIMER_IOCTL_STOP:
1886 case SNDRV_TIMER_IOCTL_STOP_OLD:
1887 return snd_timer_user_stop(file);
1888 case SNDRV_TIMER_IOCTL_CONTINUE:
1889 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1890 return snd_timer_user_continue(file);
1891 case SNDRV_TIMER_IOCTL_PAUSE:
1892 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1893 return snd_timer_user_pause(file);
1898 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1901 struct snd_timer_user *tu = file->private_data;
1904 mutex_lock(&tu->ioctl_lock);
1905 ret = __snd_timer_user_ioctl(file, cmd, arg);
1906 mutex_unlock(&tu->ioctl_lock);
1910 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1912 struct snd_timer_user *tu;
1914 tu = file->private_data;
1915 return fasync_helper(fd, file, on, &tu->fasync);
1918 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1919 size_t count, loff_t *offset)
1921 struct snd_timer_user *tu;
1922 long result = 0, unit;
1926 tu = file->private_data;
1927 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1928 spin_lock_irq(&tu->qlock);
1929 while ((long)count - result >= unit) {
1930 while (!tu->qused) {
1933 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1938 set_current_state(TASK_INTERRUPTIBLE);
1939 init_waitqueue_entry(&wait, current);
1940 add_wait_queue(&tu->qchange_sleep, &wait);
1942 spin_unlock_irq(&tu->qlock);
1944 spin_lock_irq(&tu->qlock);
1946 remove_wait_queue(&tu->qchange_sleep, &wait);
1948 if (tu->disconnected) {
1952 if (signal_pending(current)) {
1958 qhead = tu->qhead++;
1959 tu->qhead %= tu->queue_size;
1960 spin_unlock_irq(&tu->qlock);
1963 if (copy_to_user(buffer, &tu->tqueue[qhead],
1964 sizeof(struct snd_timer_tread)))
1967 if (copy_to_user(buffer, &tu->queue[qhead],
1968 sizeof(struct snd_timer_read)))
1972 spin_lock_irq(&tu->qlock);
1980 spin_unlock_irq(&tu->qlock);
1981 return result > 0 ? result : err;
1984 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1987 struct snd_timer_user *tu;
1989 tu = file->private_data;
1991 poll_wait(file, &tu->qchange_sleep, wait);
1995 mask |= POLLIN | POLLRDNORM;
1996 if (tu->disconnected)
2002 #ifdef CONFIG_COMPAT
2003 #include "timer_compat.c"
2005 #define snd_timer_user_ioctl_compat NULL
2008 static const struct file_operations snd_timer_f_ops =
2010 .owner = THIS_MODULE,
2011 .read = snd_timer_user_read,
2012 .open = snd_timer_user_open,
2013 .release = snd_timer_user_release,
2014 .llseek = no_llseek,
2015 .poll = snd_timer_user_poll,
2016 .unlocked_ioctl = snd_timer_user_ioctl,
2017 .compat_ioctl = snd_timer_user_ioctl_compat,
2018 .fasync = snd_timer_user_fasync,
2021 /* unregister the system timer */
2022 static void snd_timer_free_all(void)
2024 struct snd_timer *timer, *n;
2026 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2027 snd_timer_free(timer);
2030 static struct device timer_dev;
2036 static int __init alsa_timer_init(void)
2040 snd_device_initialize(&timer_dev, NULL);
2041 dev_set_name(&timer_dev, "timer");
2043 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2044 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2048 err = snd_timer_register_system();
2050 pr_err("ALSA: unable to register system timer (%i)\n", err);
2051 put_device(&timer_dev);
2055 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2056 &snd_timer_f_ops, NULL, &timer_dev);
2058 pr_err("ALSA: unable to register timer device (%i)\n", err);
2059 snd_timer_free_all();
2060 put_device(&timer_dev);
2064 snd_timer_proc_init();
2068 static void __exit alsa_timer_exit(void)
2070 snd_unregister_device(&timer_dev);
2071 snd_timer_free_all();
2072 put_device(&timer_dev);
2073 snd_timer_proc_done();
2074 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2075 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2079 module_init(alsa_timer_init)
2080 module_exit(alsa_timer_exit)
2082 EXPORT_SYMBOL(snd_timer_open);
2083 EXPORT_SYMBOL(snd_timer_close);
2084 EXPORT_SYMBOL(snd_timer_resolution);
2085 EXPORT_SYMBOL(snd_timer_start);
2086 EXPORT_SYMBOL(snd_timer_stop);
2087 EXPORT_SYMBOL(snd_timer_continue);
2088 EXPORT_SYMBOL(snd_timer_pause);
2089 EXPORT_SYMBOL(snd_timer_new);
2090 EXPORT_SYMBOL(snd_timer_notify);
2091 EXPORT_SYMBOL(snd_timer_global_new);
2092 EXPORT_SYMBOL(snd_timer_global_free);
2093 EXPORT_SYMBOL(snd_timer_global_register);
2094 EXPORT_SYMBOL(snd_timer_interrupt);