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,
309 int keep_flag, int event);
312 * close a timer instance
314 int snd_timer_close(struct snd_timer_instance *timeri)
316 struct snd_timer *timer = NULL;
317 struct snd_timer_instance *slave, *tmp;
319 if (snd_BUG_ON(!timeri))
322 /* force to stop the timer */
323 snd_timer_stop(timeri);
325 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
326 /* wait, until the active callback is finished */
327 spin_lock_irq(&slave_active_lock);
328 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
329 spin_unlock_irq(&slave_active_lock);
331 spin_lock_irq(&slave_active_lock);
333 spin_unlock_irq(&slave_active_lock);
334 mutex_lock(®ister_mutex);
335 list_del(&timeri->open_list);
336 mutex_unlock(®ister_mutex);
338 timer = timeri->timer;
339 if (snd_BUG_ON(!timer))
341 /* wait, until the active callback is finished */
342 spin_lock_irq(&timer->lock);
343 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
344 spin_unlock_irq(&timer->lock);
346 spin_lock_irq(&timer->lock);
348 spin_unlock_irq(&timer->lock);
349 mutex_lock(®ister_mutex);
350 list_del(&timeri->open_list);
351 if (timer && list_empty(&timer->open_list_head) &&
353 timer->hw.close(timer);
354 /* remove slave links */
355 spin_lock_irq(&slave_active_lock);
356 spin_lock(&timer->lock);
357 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
359 list_move_tail(&slave->open_list, &snd_timer_slave_list);
360 slave->master = NULL;
362 list_del_init(&slave->ack_list);
363 list_del_init(&slave->active_list);
365 spin_unlock(&timer->lock);
366 spin_unlock_irq(&slave_active_lock);
367 /* release a card refcount for safe disconnection */
369 put_device(&timer->card->card_dev);
370 mutex_unlock(®ister_mutex);
373 if (timeri->private_free)
374 timeri->private_free(timeri);
375 kfree(timeri->owner);
378 module_put(timer->module);
382 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
384 struct snd_timer * timer;
388 if ((timer = timeri->timer) != NULL) {
389 if (timer->hw.c_resolution)
390 return timer->hw.c_resolution(timer);
391 return timer->hw.resolution;
396 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
398 struct snd_timer *timer;
400 unsigned long resolution = 0;
401 struct snd_timer_instance *ts;
402 struct timespec tstamp;
404 if (timer_tstamp_monotonic)
405 ktime_get_ts(&tstamp);
407 getnstimeofday(&tstamp);
408 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
409 event > SNDRV_TIMER_EVENT_PAUSE))
411 if (event == SNDRV_TIMER_EVENT_START ||
412 event == SNDRV_TIMER_EVENT_CONTINUE)
413 resolution = snd_timer_resolution(ti);
415 ti->ccallback(ti, event, &tstamp, resolution);
416 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
421 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
423 spin_lock_irqsave(&timer->lock, flags);
424 list_for_each_entry(ts, &ti->slave_active_head, active_list)
426 ts->ccallback(ti, event + 100, &tstamp, resolution);
427 spin_unlock_irqrestore(&timer->lock, flags);
430 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
431 unsigned long sticks)
433 list_move_tail(&timeri->active_list, &timer->active_list_head);
434 if (timer->running) {
435 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
437 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
438 timeri->flags |= SNDRV_TIMER_IFLG_START;
439 return 1; /* delayed start */
441 timer->sticks = sticks;
442 timer->hw.start(timer);
445 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
450 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
454 spin_lock_irqsave(&slave_active_lock, flags);
455 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
456 if (timeri->master && timeri->timer) {
457 spin_lock(&timeri->timer->lock);
458 list_add_tail(&timeri->active_list,
459 &timeri->master->slave_active_head);
460 spin_unlock(&timeri->timer->lock);
462 spin_unlock_irqrestore(&slave_active_lock, flags);
463 return 1; /* delayed start */
467 * start the timer instance
469 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
471 struct snd_timer *timer;
472 int result = -EINVAL;
475 if (timeri == NULL || ticks < 1)
477 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
478 result = snd_timer_start_slave(timeri);
479 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
482 timer = timeri->timer;
485 if (timer->card && timer->card->shutdown)
487 spin_lock_irqsave(&timer->lock, flags);
488 timeri->ticks = timeri->cticks = ticks;
490 result = snd_timer_start1(timer, timeri, ticks);
491 spin_unlock_irqrestore(&timer->lock, flags);
492 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
496 static int _snd_timer_stop(struct snd_timer_instance * timeri,
497 int keep_flag, int event)
499 struct snd_timer *timer;
502 if (snd_BUG_ON(!timeri))
505 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
507 spin_lock_irqsave(&slave_active_lock, flags);
508 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
509 list_del_init(&timeri->ack_list);
510 list_del_init(&timeri->active_list);
511 spin_unlock_irqrestore(&slave_active_lock, flags);
515 timer = timeri->timer;
518 spin_lock_irqsave(&timer->lock, flags);
519 list_del_init(&timeri->ack_list);
520 list_del_init(&timeri->active_list);
521 if (timer->card && timer->card->shutdown) {
522 spin_unlock_irqrestore(&timer->lock, flags);
525 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
526 !(--timer->running)) {
527 timer->hw.stop(timer);
528 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
529 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
530 snd_timer_reschedule(timer, 0);
531 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
532 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
533 timer->hw.start(timer);
539 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
540 spin_unlock_irqrestore(&timer->lock, flags);
542 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
543 snd_timer_notify1(timeri, event);
548 * stop the timer instance.
550 * do not call this from the timer callback!
552 int snd_timer_stop(struct snd_timer_instance *timeri)
554 struct snd_timer *timer;
558 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
561 timer = timeri->timer;
564 spin_lock_irqsave(&timer->lock, flags);
565 timeri->cticks = timeri->ticks;
567 spin_unlock_irqrestore(&timer->lock, flags);
572 * start again.. the tick is kept.
574 int snd_timer_continue(struct snd_timer_instance *timeri)
576 struct snd_timer *timer;
577 int result = -EINVAL;
582 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
583 return snd_timer_start_slave(timeri);
584 timer = timeri->timer;
587 if (timer->card && timer->card->shutdown)
589 spin_lock_irqsave(&timer->lock, flags);
593 result = snd_timer_start1(timer, timeri, timer->sticks);
594 spin_unlock_irqrestore(&timer->lock, flags);
595 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
600 * pause.. remember the ticks left
602 int snd_timer_pause(struct snd_timer_instance * timeri)
604 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
608 * reschedule the timer
610 * start pending instances and check the scheduling ticks.
611 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
613 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
615 struct snd_timer_instance *ti;
616 unsigned long ticks = ~0UL;
618 list_for_each_entry(ti, &timer->active_list_head, active_list) {
619 if (ti->flags & SNDRV_TIMER_IFLG_START) {
620 ti->flags &= ~SNDRV_TIMER_IFLG_START;
621 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
624 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
625 if (ticks > ti->cticks)
630 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
633 if (ticks > timer->hw.ticks)
634 ticks = timer->hw.ticks;
635 if (ticks_left != ticks)
636 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
637 timer->sticks = ticks;
644 static void snd_timer_tasklet(unsigned long arg)
646 struct snd_timer *timer = (struct snd_timer *) arg;
647 struct snd_timer_instance *ti;
649 unsigned long resolution, ticks;
652 if (timer->card && timer->card->shutdown)
655 spin_lock_irqsave(&timer->lock, flags);
656 /* now process all callbacks */
657 while (!list_empty(&timer->sack_list_head)) {
658 p = timer->sack_list_head.next; /* get first item */
659 ti = list_entry(p, struct snd_timer_instance, ack_list);
661 /* remove from ack_list and make empty */
666 resolution = ti->resolution;
668 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
669 spin_unlock(&timer->lock);
671 ti->callback(ti, resolution, ticks);
672 spin_lock(&timer->lock);
673 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
675 spin_unlock_irqrestore(&timer->lock, flags);
681 * ticks_left is usually equal to timer->sticks.
684 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
686 struct snd_timer_instance *ti, *ts, *tmp;
687 unsigned long resolution, ticks;
688 struct list_head *p, *ack_list_head;
695 if (timer->card && timer->card->shutdown)
698 spin_lock_irqsave(&timer->lock, flags);
700 /* remember the current resolution */
701 if (timer->hw.c_resolution)
702 resolution = timer->hw.c_resolution(timer);
704 resolution = timer->hw.resolution;
706 /* loop for all active instances
707 * Here we cannot use list_for_each_entry because the active_list of a
708 * processed instance is relinked to done_list_head before the callback
711 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
713 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
715 ti->pticks += ticks_left;
716 ti->resolution = resolution;
717 if (ti->cticks < ticks_left)
720 ti->cticks -= ticks_left;
721 if (ti->cticks) /* not expired */
723 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
724 ti->cticks = ti->ticks;
726 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
727 if (--timer->running)
728 list_del_init(&ti->active_list);
730 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
731 (ti->flags & SNDRV_TIMER_IFLG_FAST))
732 ack_list_head = &timer->ack_list_head;
734 ack_list_head = &timer->sack_list_head;
735 if (list_empty(&ti->ack_list))
736 list_add_tail(&ti->ack_list, ack_list_head);
737 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
738 ts->pticks = ti->pticks;
739 ts->resolution = resolution;
740 if (list_empty(&ts->ack_list))
741 list_add_tail(&ts->ack_list, ack_list_head);
744 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
745 snd_timer_reschedule(timer, timer->sticks);
746 if (timer->running) {
747 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
748 timer->hw.stop(timer);
749 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
751 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
752 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
754 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
755 timer->hw.start(timer);
758 timer->hw.stop(timer);
761 /* now process all fast callbacks */
762 while (!list_empty(&timer->ack_list_head)) {
763 p = timer->ack_list_head.next; /* get first item */
764 ti = list_entry(p, struct snd_timer_instance, ack_list);
766 /* remove from ack_list and make empty */
772 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
773 spin_unlock(&timer->lock);
775 ti->callback(ti, resolution, ticks);
776 spin_lock(&timer->lock);
777 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
780 /* do we have any slow callbacks? */
781 use_tasklet = !list_empty(&timer->sack_list_head);
782 spin_unlock_irqrestore(&timer->lock, flags);
785 tasklet_schedule(&timer->task_queue);
792 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
793 struct snd_timer **rtimer)
795 struct snd_timer *timer;
797 static struct snd_device_ops ops = {
798 .dev_free = snd_timer_dev_free,
799 .dev_register = snd_timer_dev_register,
800 .dev_disconnect = snd_timer_dev_disconnect,
803 if (snd_BUG_ON(!tid))
807 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
810 timer->tmr_class = tid->dev_class;
812 timer->tmr_device = tid->device;
813 timer->tmr_subdevice = tid->subdevice;
815 strlcpy(timer->id, id, sizeof(timer->id));
816 INIT_LIST_HEAD(&timer->device_list);
817 INIT_LIST_HEAD(&timer->open_list_head);
818 INIT_LIST_HEAD(&timer->active_list_head);
819 INIT_LIST_HEAD(&timer->ack_list_head);
820 INIT_LIST_HEAD(&timer->sack_list_head);
821 spin_lock_init(&timer->lock);
822 tasklet_init(&timer->task_queue, snd_timer_tasklet,
823 (unsigned long)timer);
825 timer->module = card->module;
826 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
828 snd_timer_free(timer);
837 static int snd_timer_free(struct snd_timer *timer)
842 mutex_lock(®ister_mutex);
843 if (! list_empty(&timer->open_list_head)) {
844 struct list_head *p, *n;
845 struct snd_timer_instance *ti;
846 pr_warn("ALSA: timer %p is busy?\n", timer);
847 list_for_each_safe(p, n, &timer->open_list_head) {
849 ti = list_entry(p, struct snd_timer_instance, open_list);
853 list_del(&timer->device_list);
854 mutex_unlock(®ister_mutex);
856 if (timer->private_free)
857 timer->private_free(timer);
862 static int snd_timer_dev_free(struct snd_device *device)
864 struct snd_timer *timer = device->device_data;
865 return snd_timer_free(timer);
868 static int snd_timer_dev_register(struct snd_device *dev)
870 struct snd_timer *timer = dev->device_data;
871 struct snd_timer *timer1;
873 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
875 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
876 !timer->hw.resolution && timer->hw.c_resolution == NULL)
879 mutex_lock(®ister_mutex);
880 list_for_each_entry(timer1, &snd_timer_list, device_list) {
881 if (timer1->tmr_class > timer->tmr_class)
883 if (timer1->tmr_class < timer->tmr_class)
885 if (timer1->card && timer->card) {
886 if (timer1->card->number > timer->card->number)
888 if (timer1->card->number < timer->card->number)
891 if (timer1->tmr_device > timer->tmr_device)
893 if (timer1->tmr_device < timer->tmr_device)
895 if (timer1->tmr_subdevice > timer->tmr_subdevice)
897 if (timer1->tmr_subdevice < timer->tmr_subdevice)
900 mutex_unlock(®ister_mutex);
903 list_add_tail(&timer->device_list, &timer1->device_list);
904 mutex_unlock(®ister_mutex);
908 /* just for reference in snd_timer_dev_disconnect() below */
909 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
910 int event, struct timespec *tstamp,
911 unsigned long resolution);
913 static int snd_timer_dev_disconnect(struct snd_device *device)
915 struct snd_timer *timer = device->device_data;
916 struct snd_timer_instance *ti;
918 mutex_lock(®ister_mutex);
919 list_del_init(&timer->device_list);
920 /* wake up pending sleepers */
921 list_for_each_entry(ti, &timer->open_list_head, open_list) {
922 /* FIXME: better to have a ti.disconnect() op */
923 if (ti->ccallback == snd_timer_user_ccallback) {
924 struct snd_timer_user *tu = ti->callback_data;
926 tu->disconnected = true;
927 wake_up(&tu->qchange_sleep);
930 mutex_unlock(®ister_mutex);
934 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
937 unsigned long resolution = 0;
938 struct snd_timer_instance *ti, *ts;
940 if (timer->card && timer->card->shutdown)
942 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
944 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
945 event > SNDRV_TIMER_EVENT_MRESUME))
947 spin_lock_irqsave(&timer->lock, flags);
948 if (event == SNDRV_TIMER_EVENT_MSTART ||
949 event == SNDRV_TIMER_EVENT_MCONTINUE ||
950 event == SNDRV_TIMER_EVENT_MRESUME) {
951 if (timer->hw.c_resolution)
952 resolution = timer->hw.c_resolution(timer);
954 resolution = timer->hw.resolution;
956 list_for_each_entry(ti, &timer->active_list_head, active_list) {
958 ti->ccallback(ti, event, tstamp, resolution);
959 list_for_each_entry(ts, &ti->slave_active_head, active_list)
961 ts->ccallback(ts, event, tstamp, resolution);
963 spin_unlock_irqrestore(&timer->lock, flags);
967 * exported functions for global timers
969 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
971 struct snd_timer_id tid;
973 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
974 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
978 return snd_timer_new(NULL, id, &tid, rtimer);
981 int snd_timer_global_free(struct snd_timer *timer)
983 return snd_timer_free(timer);
986 int snd_timer_global_register(struct snd_timer *timer)
988 struct snd_device dev;
990 memset(&dev, 0, sizeof(dev));
991 dev.device_data = timer;
992 return snd_timer_dev_register(&dev);
999 struct snd_timer_system_private {
1000 struct timer_list tlist;
1001 unsigned long last_expires;
1002 unsigned long last_jiffies;
1003 unsigned long correction;
1006 static void snd_timer_s_function(unsigned long data)
1008 struct snd_timer *timer = (struct snd_timer *)data;
1009 struct snd_timer_system_private *priv = timer->private_data;
1010 unsigned long jiff = jiffies;
1011 if (time_after(jiff, priv->last_expires))
1012 priv->correction += (long)jiff - (long)priv->last_expires;
1013 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1016 static int snd_timer_s_start(struct snd_timer * timer)
1018 struct snd_timer_system_private *priv;
1019 unsigned long njiff;
1021 priv = (struct snd_timer_system_private *) timer->private_data;
1022 njiff = (priv->last_jiffies = jiffies);
1023 if (priv->correction > timer->sticks - 1) {
1024 priv->correction -= timer->sticks - 1;
1027 njiff += timer->sticks - priv->correction;
1028 priv->correction = 0;
1030 priv->last_expires = priv->tlist.expires = njiff;
1031 add_timer(&priv->tlist);
1035 static int snd_timer_s_stop(struct snd_timer * timer)
1037 struct snd_timer_system_private *priv;
1040 priv = (struct snd_timer_system_private *) timer->private_data;
1041 del_timer(&priv->tlist);
1043 if (time_before(jiff, priv->last_expires))
1044 timer->sticks = priv->last_expires - jiff;
1047 priv->correction = 0;
1051 static struct snd_timer_hardware snd_timer_system =
1053 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1054 .resolution = 1000000000L / HZ,
1056 .start = snd_timer_s_start,
1057 .stop = snd_timer_s_stop
1060 static void snd_timer_free_system(struct snd_timer *timer)
1062 kfree(timer->private_data);
1065 static int snd_timer_register_system(void)
1067 struct snd_timer *timer;
1068 struct snd_timer_system_private *priv;
1071 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1074 strcpy(timer->name, "system timer");
1075 timer->hw = snd_timer_system;
1076 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1078 snd_timer_free(timer);
1081 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1082 timer->private_data = priv;
1083 timer->private_free = snd_timer_free_system;
1084 return snd_timer_global_register(timer);
1087 #ifdef CONFIG_SND_PROC_FS
1092 static void snd_timer_proc_read(struct snd_info_entry *entry,
1093 struct snd_info_buffer *buffer)
1095 struct snd_timer *timer;
1096 struct snd_timer_instance *ti;
1098 mutex_lock(®ister_mutex);
1099 list_for_each_entry(timer, &snd_timer_list, device_list) {
1100 if (timer->card && timer->card->shutdown)
1102 switch (timer->tmr_class) {
1103 case SNDRV_TIMER_CLASS_GLOBAL:
1104 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1106 case SNDRV_TIMER_CLASS_CARD:
1107 snd_iprintf(buffer, "C%i-%i: ",
1108 timer->card->number, timer->tmr_device);
1110 case SNDRV_TIMER_CLASS_PCM:
1111 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1112 timer->tmr_device, timer->tmr_subdevice);
1115 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1116 timer->card ? timer->card->number : -1,
1117 timer->tmr_device, timer->tmr_subdevice);
1119 snd_iprintf(buffer, "%s :", timer->name);
1120 if (timer->hw.resolution)
1121 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1122 timer->hw.resolution / 1000,
1123 timer->hw.resolution % 1000,
1125 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1126 snd_iprintf(buffer, " SLAVE");
1127 snd_iprintf(buffer, "\n");
1128 list_for_each_entry(ti, &timer->open_list_head, open_list)
1129 snd_iprintf(buffer, " Client %s : %s\n",
1130 ti->owner ? ti->owner : "unknown",
1131 ti->flags & (SNDRV_TIMER_IFLG_START |
1132 SNDRV_TIMER_IFLG_RUNNING)
1133 ? "running" : "stopped");
1135 mutex_unlock(®ister_mutex);
1138 static struct snd_info_entry *snd_timer_proc_entry;
1140 static void __init snd_timer_proc_init(void)
1142 struct snd_info_entry *entry;
1144 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1145 if (entry != NULL) {
1146 entry->c.text.read = snd_timer_proc_read;
1147 if (snd_info_register(entry) < 0) {
1148 snd_info_free_entry(entry);
1152 snd_timer_proc_entry = entry;
1155 static void __exit snd_timer_proc_done(void)
1157 snd_info_free_entry(snd_timer_proc_entry);
1159 #else /* !CONFIG_SND_PROC_FS */
1160 #define snd_timer_proc_init()
1161 #define snd_timer_proc_done()
1165 * USER SPACE interface
1168 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1169 unsigned long resolution,
1170 unsigned long ticks)
1172 struct snd_timer_user *tu = timeri->callback_data;
1173 struct snd_timer_read *r;
1176 spin_lock(&tu->qlock);
1177 if (tu->qused > 0) {
1178 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1179 r = &tu->queue[prev];
1180 if (r->resolution == resolution) {
1185 if (tu->qused >= tu->queue_size) {
1188 r = &tu->queue[tu->qtail++];
1189 tu->qtail %= tu->queue_size;
1190 r->resolution = resolution;
1195 spin_unlock(&tu->qlock);
1196 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1197 wake_up(&tu->qchange_sleep);
1200 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1201 struct snd_timer_tread *tread)
1203 if (tu->qused >= tu->queue_size) {
1206 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1207 tu->qtail %= tu->queue_size;
1212 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1214 struct timespec *tstamp,
1215 unsigned long resolution)
1217 struct snd_timer_user *tu = timeri->callback_data;
1218 struct snd_timer_tread r1;
1219 unsigned long flags;
1221 if (event >= SNDRV_TIMER_EVENT_START &&
1222 event <= SNDRV_TIMER_EVENT_PAUSE)
1223 tu->tstamp = *tstamp;
1224 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1227 r1.tstamp = *tstamp;
1228 r1.val = resolution;
1229 spin_lock_irqsave(&tu->qlock, flags);
1230 snd_timer_user_append_to_tqueue(tu, &r1);
1231 spin_unlock_irqrestore(&tu->qlock, flags);
1232 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1233 wake_up(&tu->qchange_sleep);
1236 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1237 unsigned long resolution,
1238 unsigned long ticks)
1240 struct snd_timer_user *tu = timeri->callback_data;
1241 struct snd_timer_tread *r, r1;
1242 struct timespec tstamp;
1243 int prev, append = 0;
1245 memset(&tstamp, 0, sizeof(tstamp));
1246 spin_lock(&tu->qlock);
1247 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1248 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1249 spin_unlock(&tu->qlock);
1252 if (tu->last_resolution != resolution || ticks > 0) {
1253 if (timer_tstamp_monotonic)
1254 ktime_get_ts(&tstamp);
1256 getnstimeofday(&tstamp);
1258 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1259 tu->last_resolution != resolution) {
1260 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1262 r1.val = resolution;
1263 snd_timer_user_append_to_tqueue(tu, &r1);
1264 tu->last_resolution = resolution;
1267 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1271 if (tu->qused > 0) {
1272 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1273 r = &tu->tqueue[prev];
1274 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1281 r1.event = SNDRV_TIMER_EVENT_TICK;
1284 snd_timer_user_append_to_tqueue(tu, &r1);
1287 spin_unlock(&tu->qlock);
1290 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1291 wake_up(&tu->qchange_sleep);
1294 static int snd_timer_user_open(struct inode *inode, struct file *file)
1296 struct snd_timer_user *tu;
1299 err = nonseekable_open(inode, file);
1303 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1306 spin_lock_init(&tu->qlock);
1307 init_waitqueue_head(&tu->qchange_sleep);
1308 mutex_init(&tu->ioctl_lock);
1310 tu->queue_size = 128;
1311 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1313 if (tu->queue == NULL) {
1317 file->private_data = tu;
1321 static int snd_timer_user_release(struct inode *inode, struct file *file)
1323 struct snd_timer_user *tu;
1325 if (file->private_data) {
1326 tu = file->private_data;
1327 file->private_data = NULL;
1328 mutex_lock(&tu->ioctl_lock);
1330 snd_timer_close(tu->timeri);
1331 mutex_unlock(&tu->ioctl_lock);
1339 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1341 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1342 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1348 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1350 id->dev_class = timer->tmr_class;
1351 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1352 id->card = timer->card ? timer->card->number : -1;
1353 id->device = timer->tmr_device;
1354 id->subdevice = timer->tmr_subdevice;
1357 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1359 struct snd_timer_id id;
1360 struct snd_timer *timer;
1361 struct list_head *p;
1363 if (copy_from_user(&id, _tid, sizeof(id)))
1365 mutex_lock(®ister_mutex);
1366 if (id.dev_class < 0) { /* first item */
1367 if (list_empty(&snd_timer_list))
1368 snd_timer_user_zero_id(&id);
1370 timer = list_entry(snd_timer_list.next,
1371 struct snd_timer, device_list);
1372 snd_timer_user_copy_id(&id, timer);
1375 switch (id.dev_class) {
1376 case SNDRV_TIMER_CLASS_GLOBAL:
1377 id.device = id.device < 0 ? 0 : id.device + 1;
1378 list_for_each(p, &snd_timer_list) {
1379 timer = list_entry(p, struct snd_timer, device_list);
1380 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1381 snd_timer_user_copy_id(&id, timer);
1384 if (timer->tmr_device >= id.device) {
1385 snd_timer_user_copy_id(&id, timer);
1389 if (p == &snd_timer_list)
1390 snd_timer_user_zero_id(&id);
1392 case SNDRV_TIMER_CLASS_CARD:
1393 case SNDRV_TIMER_CLASS_PCM:
1400 if (id.device < 0) {
1403 if (id.subdevice < 0) {
1411 list_for_each(p, &snd_timer_list) {
1412 timer = list_entry(p, struct snd_timer, device_list);
1413 if (timer->tmr_class > id.dev_class) {
1414 snd_timer_user_copy_id(&id, timer);
1417 if (timer->tmr_class < id.dev_class)
1419 if (timer->card->number > id.card) {
1420 snd_timer_user_copy_id(&id, timer);
1423 if (timer->card->number < id.card)
1425 if (timer->tmr_device > id.device) {
1426 snd_timer_user_copy_id(&id, timer);
1429 if (timer->tmr_device < id.device)
1431 if (timer->tmr_subdevice > id.subdevice) {
1432 snd_timer_user_copy_id(&id, timer);
1435 if (timer->tmr_subdevice < id.subdevice)
1437 snd_timer_user_copy_id(&id, timer);
1440 if (p == &snd_timer_list)
1441 snd_timer_user_zero_id(&id);
1444 snd_timer_user_zero_id(&id);
1447 mutex_unlock(®ister_mutex);
1448 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1453 static int snd_timer_user_ginfo(struct file *file,
1454 struct snd_timer_ginfo __user *_ginfo)
1456 struct snd_timer_ginfo *ginfo;
1457 struct snd_timer_id tid;
1458 struct snd_timer *t;
1459 struct list_head *p;
1462 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1464 return PTR_ERR(ginfo);
1467 memset(ginfo, 0, sizeof(*ginfo));
1469 mutex_lock(®ister_mutex);
1470 t = snd_timer_find(&tid);
1472 ginfo->card = t->card ? t->card->number : -1;
1473 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1474 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1475 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1476 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1477 ginfo->resolution = t->hw.resolution;
1478 if (t->hw.resolution_min > 0) {
1479 ginfo->resolution_min = t->hw.resolution_min;
1480 ginfo->resolution_max = t->hw.resolution_max;
1482 list_for_each(p, &t->open_list_head) {
1488 mutex_unlock(®ister_mutex);
1489 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1495 static int snd_timer_user_gparams(struct file *file,
1496 struct snd_timer_gparams __user *_gparams)
1498 struct snd_timer_gparams gparams;
1499 struct snd_timer *t;
1502 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1504 mutex_lock(®ister_mutex);
1505 t = snd_timer_find(&gparams.tid);
1510 if (!list_empty(&t->open_list_head)) {
1514 if (!t->hw.set_period) {
1518 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1520 mutex_unlock(®ister_mutex);
1524 static int snd_timer_user_gstatus(struct file *file,
1525 struct snd_timer_gstatus __user *_gstatus)
1527 struct snd_timer_gstatus gstatus;
1528 struct snd_timer_id tid;
1529 struct snd_timer *t;
1532 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1535 memset(&gstatus, 0, sizeof(gstatus));
1537 mutex_lock(®ister_mutex);
1538 t = snd_timer_find(&tid);
1540 if (t->hw.c_resolution)
1541 gstatus.resolution = t->hw.c_resolution(t);
1543 gstatus.resolution = t->hw.resolution;
1544 if (t->hw.precise_resolution) {
1545 t->hw.precise_resolution(t, &gstatus.resolution_num,
1546 &gstatus.resolution_den);
1548 gstatus.resolution_num = gstatus.resolution;
1549 gstatus.resolution_den = 1000000000uL;
1554 mutex_unlock(®ister_mutex);
1555 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1560 static int snd_timer_user_tselect(struct file *file,
1561 struct snd_timer_select __user *_tselect)
1563 struct snd_timer_user *tu;
1564 struct snd_timer_select tselect;
1568 tu = file->private_data;
1570 snd_timer_close(tu->timeri);
1573 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1577 sprintf(str, "application %i", current->pid);
1578 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1579 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1580 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1589 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1591 if (tu->tqueue == NULL)
1594 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1596 if (tu->queue == NULL)
1601 snd_timer_close(tu->timeri);
1604 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1605 tu->timeri->callback = tu->tread
1606 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1607 tu->timeri->ccallback = snd_timer_user_ccallback;
1608 tu->timeri->callback_data = (void *)tu;
1615 static int snd_timer_user_info(struct file *file,
1616 struct snd_timer_info __user *_info)
1618 struct snd_timer_user *tu;
1619 struct snd_timer_info *info;
1620 struct snd_timer *t;
1623 tu = file->private_data;
1626 t = tu->timeri->timer;
1630 info = kzalloc(sizeof(*info), GFP_KERNEL);
1633 info->card = t->card ? t->card->number : -1;
1634 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1635 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1636 strlcpy(info->id, t->id, sizeof(info->id));
1637 strlcpy(info->name, t->name, sizeof(info->name));
1638 info->resolution = t->hw.resolution;
1639 if (copy_to_user(_info, info, sizeof(*_info)))
1645 static int snd_timer_user_params(struct file *file,
1646 struct snd_timer_params __user *_params)
1648 struct snd_timer_user *tu;
1649 struct snd_timer_params params;
1650 struct snd_timer *t;
1651 struct snd_timer_read *tr;
1652 struct snd_timer_tread *ttr;
1655 tu = file->private_data;
1658 t = tu->timeri->timer;
1661 if (copy_from_user(¶ms, _params, sizeof(params)))
1663 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1667 if (params.queue_size > 0 &&
1668 (params.queue_size < 32 || params.queue_size > 1024)) {
1672 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1673 (1<<SNDRV_TIMER_EVENT_TICK)|
1674 (1<<SNDRV_TIMER_EVENT_START)|
1675 (1<<SNDRV_TIMER_EVENT_STOP)|
1676 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1677 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1678 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1679 (1<<SNDRV_TIMER_EVENT_RESUME)|
1680 (1<<SNDRV_TIMER_EVENT_MSTART)|
1681 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1682 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1683 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1684 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1685 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1689 snd_timer_stop(tu->timeri);
1690 spin_lock_irq(&t->lock);
1691 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1692 SNDRV_TIMER_IFLG_EXCLUSIVE|
1693 SNDRV_TIMER_IFLG_EARLY_EVENT);
1694 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1695 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1696 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1697 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1698 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1699 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1700 spin_unlock_irq(&t->lock);
1701 if (params.queue_size > 0 &&
1702 (unsigned int)tu->queue_size != params.queue_size) {
1704 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1708 tu->queue_size = params.queue_size;
1712 tr = kmalloc(params.queue_size * sizeof(*tr),
1716 tu->queue_size = params.queue_size;
1721 tu->qhead = tu->qtail = tu->qused = 0;
1722 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1724 struct snd_timer_tread tread;
1725 tread.event = SNDRV_TIMER_EVENT_EARLY;
1726 tread.tstamp.tv_sec = 0;
1727 tread.tstamp.tv_nsec = 0;
1729 snd_timer_user_append_to_tqueue(tu, &tread);
1731 struct snd_timer_read *r = &tu->queue[0];
1738 tu->filter = params.filter;
1739 tu->ticks = params.ticks;
1742 if (copy_to_user(_params, ¶ms, sizeof(params)))
1747 static int snd_timer_user_status(struct file *file,
1748 struct snd_timer_status __user *_status)
1750 struct snd_timer_user *tu;
1751 struct snd_timer_status status;
1753 tu = file->private_data;
1756 memset(&status, 0, sizeof(status));
1757 status.tstamp = tu->tstamp;
1758 status.resolution = snd_timer_resolution(tu->timeri);
1759 status.lost = tu->timeri->lost;
1760 status.overrun = tu->overrun;
1761 spin_lock_irq(&tu->qlock);
1762 status.queue = tu->qused;
1763 spin_unlock_irq(&tu->qlock);
1764 if (copy_to_user(_status, &status, sizeof(status)))
1769 static int snd_timer_user_start(struct file *file)
1772 struct snd_timer_user *tu;
1774 tu = file->private_data;
1777 snd_timer_stop(tu->timeri);
1778 tu->timeri->lost = 0;
1779 tu->last_resolution = 0;
1780 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1783 static int snd_timer_user_stop(struct file *file)
1786 struct snd_timer_user *tu;
1788 tu = file->private_data;
1791 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1794 static int snd_timer_user_continue(struct file *file)
1797 struct snd_timer_user *tu;
1799 tu = file->private_data;
1802 tu->timeri->lost = 0;
1803 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1806 static int snd_timer_user_pause(struct file *file)
1809 struct snd_timer_user *tu;
1811 tu = file->private_data;
1814 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1818 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1819 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1820 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1821 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1824 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1827 struct snd_timer_user *tu;
1828 void __user *argp = (void __user *)arg;
1829 int __user *p = argp;
1831 tu = file->private_data;
1833 case SNDRV_TIMER_IOCTL_PVERSION:
1834 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1835 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1836 return snd_timer_user_next_device(argp);
1837 case SNDRV_TIMER_IOCTL_TREAD:
1841 if (tu->timeri) /* too late */
1843 if (get_user(xarg, p))
1845 tu->tread = xarg ? 1 : 0;
1848 case SNDRV_TIMER_IOCTL_GINFO:
1849 return snd_timer_user_ginfo(file, argp);
1850 case SNDRV_TIMER_IOCTL_GPARAMS:
1851 return snd_timer_user_gparams(file, argp);
1852 case SNDRV_TIMER_IOCTL_GSTATUS:
1853 return snd_timer_user_gstatus(file, argp);
1854 case SNDRV_TIMER_IOCTL_SELECT:
1855 return snd_timer_user_tselect(file, argp);
1856 case SNDRV_TIMER_IOCTL_INFO:
1857 return snd_timer_user_info(file, argp);
1858 case SNDRV_TIMER_IOCTL_PARAMS:
1859 return snd_timer_user_params(file, argp);
1860 case SNDRV_TIMER_IOCTL_STATUS:
1861 return snd_timer_user_status(file, argp);
1862 case SNDRV_TIMER_IOCTL_START:
1863 case SNDRV_TIMER_IOCTL_START_OLD:
1864 return snd_timer_user_start(file);
1865 case SNDRV_TIMER_IOCTL_STOP:
1866 case SNDRV_TIMER_IOCTL_STOP_OLD:
1867 return snd_timer_user_stop(file);
1868 case SNDRV_TIMER_IOCTL_CONTINUE:
1869 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1870 return snd_timer_user_continue(file);
1871 case SNDRV_TIMER_IOCTL_PAUSE:
1872 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1873 return snd_timer_user_pause(file);
1878 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1881 struct snd_timer_user *tu = file->private_data;
1884 mutex_lock(&tu->ioctl_lock);
1885 ret = __snd_timer_user_ioctl(file, cmd, arg);
1886 mutex_unlock(&tu->ioctl_lock);
1890 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1892 struct snd_timer_user *tu;
1894 tu = file->private_data;
1895 return fasync_helper(fd, file, on, &tu->fasync);
1898 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1899 size_t count, loff_t *offset)
1901 struct snd_timer_user *tu;
1902 long result = 0, unit;
1905 tu = file->private_data;
1906 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1907 spin_lock_irq(&tu->qlock);
1908 while ((long)count - result >= unit) {
1909 while (!tu->qused) {
1912 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1917 set_current_state(TASK_INTERRUPTIBLE);
1918 init_waitqueue_entry(&wait, current);
1919 add_wait_queue(&tu->qchange_sleep, &wait);
1921 spin_unlock_irq(&tu->qlock);
1923 spin_lock_irq(&tu->qlock);
1925 remove_wait_queue(&tu->qchange_sleep, &wait);
1927 if (tu->disconnected) {
1931 if (signal_pending(current)) {
1937 spin_unlock_irq(&tu->qlock);
1942 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1943 sizeof(struct snd_timer_tread))) {
1948 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1949 sizeof(struct snd_timer_read))) {
1955 tu->qhead %= tu->queue_size;
1960 spin_lock_irq(&tu->qlock);
1963 spin_unlock_irq(&tu->qlock);
1965 return result > 0 ? result : err;
1968 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1971 struct snd_timer_user *tu;
1973 tu = file->private_data;
1975 poll_wait(file, &tu->qchange_sleep, wait);
1979 mask |= POLLIN | POLLRDNORM;
1980 if (tu->disconnected)
1986 #ifdef CONFIG_COMPAT
1987 #include "timer_compat.c"
1989 #define snd_timer_user_ioctl_compat NULL
1992 static const struct file_operations snd_timer_f_ops =
1994 .owner = THIS_MODULE,
1995 .read = snd_timer_user_read,
1996 .open = snd_timer_user_open,
1997 .release = snd_timer_user_release,
1998 .llseek = no_llseek,
1999 .poll = snd_timer_user_poll,
2000 .unlocked_ioctl = snd_timer_user_ioctl,
2001 .compat_ioctl = snd_timer_user_ioctl_compat,
2002 .fasync = snd_timer_user_fasync,
2005 /* unregister the system timer */
2006 static void snd_timer_free_all(void)
2008 struct snd_timer *timer, *n;
2010 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2011 snd_timer_free(timer);
2014 static struct device timer_dev;
2020 static int __init alsa_timer_init(void)
2024 snd_device_initialize(&timer_dev, NULL);
2025 dev_set_name(&timer_dev, "timer");
2027 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2028 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2032 err = snd_timer_register_system();
2034 pr_err("ALSA: unable to register system timer (%i)\n", err);
2035 put_device(&timer_dev);
2039 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2040 &snd_timer_f_ops, NULL, &timer_dev);
2042 pr_err("ALSA: unable to register timer device (%i)\n", err);
2043 snd_timer_free_all();
2044 put_device(&timer_dev);
2048 snd_timer_proc_init();
2052 static void __exit alsa_timer_exit(void)
2054 snd_unregister_device(&timer_dev);
2055 snd_timer_free_all();
2056 put_device(&timer_dev);
2057 snd_timer_proc_done();
2058 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2059 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2063 module_init(alsa_timer_init)
2064 module_exit(alsa_timer_exit)
2066 EXPORT_SYMBOL(snd_timer_open);
2067 EXPORT_SYMBOL(snd_timer_close);
2068 EXPORT_SYMBOL(snd_timer_resolution);
2069 EXPORT_SYMBOL(snd_timer_start);
2070 EXPORT_SYMBOL(snd_timer_stop);
2071 EXPORT_SYMBOL(snd_timer_continue);
2072 EXPORT_SYMBOL(snd_timer_pause);
2073 EXPORT_SYMBOL(snd_timer_new);
2074 EXPORT_SYMBOL(snd_timer_notify);
2075 EXPORT_SYMBOL(snd_timer_global_new);
2076 EXPORT_SYMBOL(snd_timer_global_free);
2077 EXPORT_SYMBOL(snd_timer_global_register);
2078 EXPORT_SYMBOL(snd_timer_interrupt);