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 <linux/sched/signal.h>
31 #include <sound/core.h>
32 #include <sound/timer.h>
33 #include <sound/control.h>
34 #include <sound/info.h>
35 #include <sound/minors.h>
36 #include <sound/initval.h>
37 #include <linux/kmod.h>
40 #define SNDRV_TIMER_IFLG_PAUSED 0x00010000
42 #if IS_ENABLED(CONFIG_SND_HRTIMER)
43 #define DEFAULT_TIMER_LIMIT 4
45 #define DEFAULT_TIMER_LIMIT 1
48 static int timer_limit = DEFAULT_TIMER_LIMIT;
49 static int timer_tstamp_monotonic = 1;
50 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
51 MODULE_DESCRIPTION("ALSA timer interface");
52 MODULE_LICENSE("GPL");
53 module_param(timer_limit, int, 0444);
54 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
55 module_param(timer_tstamp_monotonic, int, 0444);
56 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
58 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
59 MODULE_ALIAS("devname:snd/timer");
61 struct snd_timer_user {
62 struct snd_timer_instance *timeri;
63 int tread; /* enhanced read with timestamps and events */
65 unsigned long overrun;
71 struct snd_timer_read *queue;
72 struct snd_timer_tread *tqueue;
74 unsigned long last_resolution;
76 struct timespec tstamp; /* trigger tstamp */
77 wait_queue_head_t qchange_sleep;
78 struct snd_fasync *fasync;
79 struct mutex ioctl_lock;
83 static LIST_HEAD(snd_timer_list);
85 /* list of slave instances */
86 static LIST_HEAD(snd_timer_slave_list);
88 /* lock for slave active lists */
89 static DEFINE_SPINLOCK(slave_active_lock);
91 #define MAX_SLAVE_INSTANCES 1000
92 static int num_slaves;
94 static DEFINE_MUTEX(register_mutex);
96 static int snd_timer_free(struct snd_timer *timer);
97 static int snd_timer_dev_free(struct snd_device *device);
98 static int snd_timer_dev_register(struct snd_device *device);
99 static int snd_timer_dev_disconnect(struct snd_device *device);
101 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
104 * create a timer instance with the given owner string.
105 * when timer is not NULL, increments the module counter
107 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
108 struct snd_timer *timer)
110 struct snd_timer_instance *timeri;
111 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
114 timeri->owner = kstrdup(owner, GFP_KERNEL);
115 if (! timeri->owner) {
119 INIT_LIST_HEAD(&timeri->open_list);
120 INIT_LIST_HEAD(&timeri->active_list);
121 INIT_LIST_HEAD(&timeri->ack_list);
122 INIT_LIST_HEAD(&timeri->slave_list_head);
123 INIT_LIST_HEAD(&timeri->slave_active_head);
125 timeri->timer = timer;
126 if (timer && !try_module_get(timer->module)) {
127 kfree(timeri->owner);
136 * find a timer instance from the given timer id
138 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
140 struct snd_timer *timer = NULL;
142 list_for_each_entry(timer, &snd_timer_list, device_list) {
143 if (timer->tmr_class != tid->dev_class)
145 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
146 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
147 (timer->card == NULL ||
148 timer->card->number != tid->card))
150 if (timer->tmr_device != tid->device)
152 if (timer->tmr_subdevice != tid->subdevice)
159 #ifdef CONFIG_MODULES
161 static void snd_timer_request(struct snd_timer_id *tid)
163 switch (tid->dev_class) {
164 case SNDRV_TIMER_CLASS_GLOBAL:
165 if (tid->device < timer_limit)
166 request_module("snd-timer-%i", tid->device);
168 case SNDRV_TIMER_CLASS_CARD:
169 case SNDRV_TIMER_CLASS_PCM:
170 if (tid->card < snd_ecards_limit)
171 request_module("snd-card-%i", tid->card);
181 * look for a master instance matching with the slave id of the given slave.
182 * when found, relink the open_link of the slave.
184 * call this with register_mutex down.
186 static int snd_timer_check_slave(struct snd_timer_instance *slave)
188 struct snd_timer *timer;
189 struct snd_timer_instance *master;
191 /* FIXME: it's really dumb to look up all entries.. */
192 list_for_each_entry(timer, &snd_timer_list, device_list) {
193 list_for_each_entry(master, &timer->open_list_head, open_list) {
194 if (slave->slave_class == master->slave_class &&
195 slave->slave_id == master->slave_id) {
196 if (master->timer->num_instances >=
197 master->timer->max_instances)
199 list_move_tail(&slave->open_list,
200 &master->slave_list_head);
201 master->timer->num_instances++;
202 spin_lock_irq(&slave_active_lock);
203 slave->master = master;
204 slave->timer = master->timer;
205 spin_unlock_irq(&slave_active_lock);
214 * look for slave instances matching with the slave id of the given master.
215 * when found, relink the open_link of slaves.
217 * call this with register_mutex down.
219 static int snd_timer_check_master(struct snd_timer_instance *master)
221 struct snd_timer_instance *slave, *tmp;
223 /* check all pending slaves */
224 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
225 if (slave->slave_class == master->slave_class &&
226 slave->slave_id == master->slave_id) {
227 if (master->timer->num_instances >=
228 master->timer->max_instances)
230 list_move_tail(&slave->open_list, &master->slave_list_head);
231 master->timer->num_instances++;
232 spin_lock_irq(&slave_active_lock);
233 spin_lock(&master->timer->lock);
234 slave->master = master;
235 slave->timer = master->timer;
236 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
237 list_add_tail(&slave->active_list,
238 &master->slave_active_head);
239 spin_unlock(&master->timer->lock);
240 spin_unlock_irq(&slave_active_lock);
246 static int snd_timer_close_locked(struct snd_timer_instance *timeri,
247 struct device **card_devp_to_put);
250 * open a timer instance
251 * when opening a master, the slave id must be here given.
253 int snd_timer_open(struct snd_timer_instance **ti,
254 char *owner, struct snd_timer_id *tid,
255 unsigned int slave_id)
257 struct snd_timer *timer;
258 struct snd_timer_instance *timeri = NULL;
259 struct device *card_dev_to_put = NULL;
262 mutex_lock(®ister_mutex);
263 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
264 /* open a slave instance */
265 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
266 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
267 pr_debug("ALSA: timer: invalid slave class %i\n",
272 if (num_slaves >= MAX_SLAVE_INSTANCES) {
276 timeri = snd_timer_instance_new(owner, NULL);
281 timeri->slave_class = tid->dev_sclass;
282 timeri->slave_id = tid->device;
283 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
284 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
286 err = snd_timer_check_slave(timeri);
288 snd_timer_close_locked(timeri, &card_dev_to_put);
294 /* open a master instance */
295 timer = snd_timer_find(tid);
296 #ifdef CONFIG_MODULES
298 mutex_unlock(®ister_mutex);
299 snd_timer_request(tid);
300 mutex_lock(®ister_mutex);
301 timer = snd_timer_find(tid);
308 if (!list_empty(&timer->open_list_head)) {
309 struct snd_timer_instance *t =
310 list_entry(timer->open_list_head.next,
311 struct snd_timer_instance, open_list);
312 if (t->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
317 if (timer->num_instances >= timer->max_instances) {
321 timeri = snd_timer_instance_new(owner, timer);
326 /* take a card refcount for safe disconnection */
328 get_device(&timer->card->card_dev);
329 timeri->slave_class = tid->dev_sclass;
330 timeri->slave_id = slave_id;
332 if (list_empty(&timer->open_list_head) && timer->hw.open) {
333 err = timer->hw.open(timer);
335 kfree(timeri->owner);
340 card_dev_to_put = &timer->card->card_dev;
341 module_put(timer->module);
346 list_add_tail(&timeri->open_list, &timer->open_list_head);
347 timer->num_instances++;
348 err = snd_timer_check_master(timeri);
350 snd_timer_close_locked(timeri, &card_dev_to_put);
355 mutex_unlock(®ister_mutex);
356 /* put_device() is called after unlock for avoiding deadlock */
358 put_device(card_dev_to_put);
362 EXPORT_SYMBOL(snd_timer_open);
365 * close a timer instance
366 * call this with register_mutex down.
368 static int snd_timer_close_locked(struct snd_timer_instance *timeri,
369 struct device **card_devp_to_put)
371 struct snd_timer *timer = NULL;
372 struct snd_timer_instance *slave, *tmp;
374 list_del(&timeri->open_list);
375 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
378 /* force to stop the timer */
379 snd_timer_stop(timeri);
381 timer = timeri->timer;
383 timer->num_instances--;
384 /* wait, until the active callback is finished */
385 spin_lock_irq(&timer->lock);
386 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
387 spin_unlock_irq(&timer->lock);
389 spin_lock_irq(&timer->lock);
391 spin_unlock_irq(&timer->lock);
393 /* remove slave links */
394 spin_lock_irq(&slave_active_lock);
395 spin_lock(&timer->lock);
396 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
398 list_move_tail(&slave->open_list, &snd_timer_slave_list);
399 timer->num_instances--;
400 slave->master = NULL;
402 list_del_init(&slave->ack_list);
403 list_del_init(&slave->active_list);
405 spin_unlock(&timer->lock);
406 spin_unlock_irq(&slave_active_lock);
408 /* slave doesn't need to release timer resources below */
409 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
413 if (timeri->private_free)
414 timeri->private_free(timeri);
415 kfree(timeri->owner);
419 if (list_empty(&timer->open_list_head) && timer->hw.close)
420 timer->hw.close(timer);
421 /* release a card refcount for safe disconnection */
423 *card_devp_to_put = &timer->card->card_dev;
424 module_put(timer->module);
431 * close a timer instance
433 int snd_timer_close(struct snd_timer_instance *timeri)
435 struct device *card_dev_to_put = NULL;
438 if (snd_BUG_ON(!timeri))
441 mutex_lock(®ister_mutex);
442 err = snd_timer_close_locked(timeri, &card_dev_to_put);
443 mutex_unlock(®ister_mutex);
444 /* put_device() is called after unlock for avoiding deadlock */
446 put_device(card_dev_to_put);
449 EXPORT_SYMBOL(snd_timer_close);
451 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
453 struct snd_timer * timer;
457 timer = timeri->timer;
459 if (timer->hw.c_resolution)
460 return timer->hw.c_resolution(timer);
461 return timer->hw.resolution;
465 EXPORT_SYMBOL(snd_timer_resolution);
467 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
469 struct snd_timer *timer;
470 unsigned long resolution = 0;
471 struct snd_timer_instance *ts;
472 struct timespec tstamp;
474 if (timer_tstamp_monotonic)
475 ktime_get_ts(&tstamp);
477 getnstimeofday(&tstamp);
478 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
479 event > SNDRV_TIMER_EVENT_PAUSE))
481 if (event == SNDRV_TIMER_EVENT_START ||
482 event == SNDRV_TIMER_EVENT_CONTINUE)
483 resolution = snd_timer_resolution(ti);
485 ti->ccallback(ti, event, &tstamp, resolution);
486 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
491 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
493 event += 10; /* convert to SNDRV_TIMER_EVENT_MXXX */
494 list_for_each_entry(ts, &ti->slave_active_head, active_list)
496 ts->ccallback(ts, event, &tstamp, resolution);
499 /* start/continue a master timer */
500 static int snd_timer_start1(struct snd_timer_instance *timeri,
501 bool start, unsigned long ticks)
503 struct snd_timer *timer;
507 timer = timeri->timer;
511 spin_lock_irqsave(&timer->lock, flags);
512 if (timer->card && timer->card->shutdown) {
516 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
517 SNDRV_TIMER_IFLG_START)) {
523 timeri->ticks = timeri->cticks = ticks;
524 else if (!timeri->cticks)
528 list_move_tail(&timeri->active_list, &timer->active_list_head);
529 if (timer->running) {
530 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
532 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
533 timeri->flags |= SNDRV_TIMER_IFLG_START;
534 result = 1; /* delayed start */
537 timer->sticks = ticks;
538 timer->hw.start(timer);
541 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
544 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
545 SNDRV_TIMER_EVENT_CONTINUE);
547 spin_unlock_irqrestore(&timer->lock, flags);
551 /* start/continue a slave timer */
552 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
557 spin_lock_irqsave(&slave_active_lock, flags);
558 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
559 spin_unlock_irqrestore(&slave_active_lock, flags);
562 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
563 if (timeri->master && timeri->timer) {
564 spin_lock(&timeri->timer->lock);
565 list_add_tail(&timeri->active_list,
566 &timeri->master->slave_active_head);
567 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
568 SNDRV_TIMER_EVENT_CONTINUE);
569 spin_unlock(&timeri->timer->lock);
571 spin_unlock_irqrestore(&slave_active_lock, flags);
572 return 1; /* delayed start */
575 /* stop/pause a master timer */
576 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
578 struct snd_timer *timer;
582 timer = timeri->timer;
585 spin_lock_irqsave(&timer->lock, flags);
586 list_del_init(&timeri->ack_list);
587 list_del_init(&timeri->active_list);
588 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
589 SNDRV_TIMER_IFLG_START))) {
593 if (timer->card && timer->card->shutdown)
596 timeri->cticks = timeri->ticks;
599 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
600 !(--timer->running)) {
601 timer->hw.stop(timer);
602 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
603 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
604 snd_timer_reschedule(timer, 0);
605 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
606 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
607 timer->hw.start(timer);
611 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
613 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
615 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
616 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
617 SNDRV_TIMER_EVENT_PAUSE);
619 spin_unlock_irqrestore(&timer->lock, flags);
623 /* stop/pause a slave timer */
624 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
629 spin_lock_irqsave(&slave_active_lock, flags);
630 running = timeri->flags & SNDRV_TIMER_IFLG_RUNNING;
631 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
633 spin_lock(&timeri->timer->lock);
634 list_del_init(&timeri->ack_list);
635 list_del_init(&timeri->active_list);
637 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
638 SNDRV_TIMER_EVENT_PAUSE);
639 spin_unlock(&timeri->timer->lock);
641 spin_unlock_irqrestore(&slave_active_lock, flags);
642 return running ? 0 : -EBUSY;
646 * start the timer instance
648 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
650 if (timeri == NULL || ticks < 1)
652 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
653 return snd_timer_start_slave(timeri, true);
655 return snd_timer_start1(timeri, true, ticks);
657 EXPORT_SYMBOL(snd_timer_start);
660 * stop the timer instance.
662 * do not call this from the timer callback!
664 int snd_timer_stop(struct snd_timer_instance *timeri)
666 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
667 return snd_timer_stop_slave(timeri, true);
669 return snd_timer_stop1(timeri, true);
671 EXPORT_SYMBOL(snd_timer_stop);
674 * start again.. the tick is kept.
676 int snd_timer_continue(struct snd_timer_instance *timeri)
678 /* timer can continue only after pause */
679 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
682 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
683 return snd_timer_start_slave(timeri, false);
685 return snd_timer_start1(timeri, false, 0);
687 EXPORT_SYMBOL(snd_timer_continue);
690 * pause.. remember the ticks left
692 int snd_timer_pause(struct snd_timer_instance * timeri)
694 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
695 return snd_timer_stop_slave(timeri, false);
697 return snd_timer_stop1(timeri, false);
699 EXPORT_SYMBOL(snd_timer_pause);
702 * reschedule the timer
704 * start pending instances and check the scheduling ticks.
705 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
707 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
709 struct snd_timer_instance *ti;
710 unsigned long ticks = ~0UL;
712 list_for_each_entry(ti, &timer->active_list_head, active_list) {
713 if (ti->flags & SNDRV_TIMER_IFLG_START) {
714 ti->flags &= ~SNDRV_TIMER_IFLG_START;
715 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
718 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
719 if (ticks > ti->cticks)
724 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
727 if (ticks > timer->hw.ticks)
728 ticks = timer->hw.ticks;
729 if (ticks_left != ticks)
730 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
731 timer->sticks = ticks;
738 static void snd_timer_tasklet(unsigned long arg)
740 struct snd_timer *timer = (struct snd_timer *) arg;
741 struct snd_timer_instance *ti;
743 unsigned long resolution, ticks;
746 if (timer->card && timer->card->shutdown)
749 spin_lock_irqsave(&timer->lock, flags);
750 /* now process all callbacks */
751 while (!list_empty(&timer->sack_list_head)) {
752 p = timer->sack_list_head.next; /* get first item */
753 ti = list_entry(p, struct snd_timer_instance, ack_list);
755 /* remove from ack_list and make empty */
760 resolution = ti->resolution;
762 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
763 spin_unlock(&timer->lock);
765 ti->callback(ti, resolution, ticks);
766 spin_lock(&timer->lock);
767 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
769 spin_unlock_irqrestore(&timer->lock, flags);
775 * ticks_left is usually equal to timer->sticks.
778 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
780 struct snd_timer_instance *ti, *ts, *tmp;
781 unsigned long resolution, ticks;
782 struct list_head *p, *ack_list_head;
789 if (timer->card && timer->card->shutdown)
792 spin_lock_irqsave(&timer->lock, flags);
794 /* remember the current resolution */
795 if (timer->hw.c_resolution)
796 resolution = timer->hw.c_resolution(timer);
798 resolution = timer->hw.resolution;
800 /* loop for all active instances
801 * Here we cannot use list_for_each_entry because the active_list of a
802 * processed instance is relinked to done_list_head before the callback
805 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
807 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
809 ti->pticks += ticks_left;
810 ti->resolution = resolution;
811 if (ti->cticks < ticks_left)
814 ti->cticks -= ticks_left;
815 if (ti->cticks) /* not expired */
817 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
818 ti->cticks = ti->ticks;
820 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
822 list_del_init(&ti->active_list);
824 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
825 (ti->flags & SNDRV_TIMER_IFLG_FAST))
826 ack_list_head = &timer->ack_list_head;
828 ack_list_head = &timer->sack_list_head;
829 if (list_empty(&ti->ack_list))
830 list_add_tail(&ti->ack_list, ack_list_head);
831 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
832 ts->pticks = ti->pticks;
833 ts->resolution = resolution;
834 if (list_empty(&ts->ack_list))
835 list_add_tail(&ts->ack_list, ack_list_head);
838 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
839 snd_timer_reschedule(timer, timer->sticks);
840 if (timer->running) {
841 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
842 timer->hw.stop(timer);
843 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
845 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
846 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
848 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
849 timer->hw.start(timer);
852 timer->hw.stop(timer);
855 /* now process all fast callbacks */
856 while (!list_empty(&timer->ack_list_head)) {
857 p = timer->ack_list_head.next; /* get first item */
858 ti = list_entry(p, struct snd_timer_instance, ack_list);
860 /* remove from ack_list and make empty */
866 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
867 spin_unlock(&timer->lock);
869 ti->callback(ti, resolution, ticks);
870 spin_lock(&timer->lock);
871 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
874 /* do we have any slow callbacks? */
875 use_tasklet = !list_empty(&timer->sack_list_head);
876 spin_unlock_irqrestore(&timer->lock, flags);
879 tasklet_schedule(&timer->task_queue);
881 EXPORT_SYMBOL(snd_timer_interrupt);
887 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
888 struct snd_timer **rtimer)
890 struct snd_timer *timer;
892 static struct snd_device_ops ops = {
893 .dev_free = snd_timer_dev_free,
894 .dev_register = snd_timer_dev_register,
895 .dev_disconnect = snd_timer_dev_disconnect,
898 if (snd_BUG_ON(!tid))
902 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
905 timer->tmr_class = tid->dev_class;
907 timer->tmr_device = tid->device;
908 timer->tmr_subdevice = tid->subdevice;
910 strlcpy(timer->id, id, sizeof(timer->id));
912 INIT_LIST_HEAD(&timer->device_list);
913 INIT_LIST_HEAD(&timer->open_list_head);
914 INIT_LIST_HEAD(&timer->active_list_head);
915 INIT_LIST_HEAD(&timer->ack_list_head);
916 INIT_LIST_HEAD(&timer->sack_list_head);
917 spin_lock_init(&timer->lock);
918 tasklet_init(&timer->task_queue, snd_timer_tasklet,
919 (unsigned long)timer);
920 timer->max_instances = 1000; /* default limit per timer */
922 timer->module = card->module;
923 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
925 snd_timer_free(timer);
933 EXPORT_SYMBOL(snd_timer_new);
935 static int snd_timer_free(struct snd_timer *timer)
940 mutex_lock(®ister_mutex);
941 if (! list_empty(&timer->open_list_head)) {
942 struct list_head *p, *n;
943 struct snd_timer_instance *ti;
944 pr_warn("ALSA: timer %p is busy?\n", timer);
945 list_for_each_safe(p, n, &timer->open_list_head) {
947 ti = list_entry(p, struct snd_timer_instance, open_list);
951 list_del(&timer->device_list);
952 mutex_unlock(®ister_mutex);
954 if (timer->private_free)
955 timer->private_free(timer);
960 static int snd_timer_dev_free(struct snd_device *device)
962 struct snd_timer *timer = device->device_data;
963 return snd_timer_free(timer);
966 static int snd_timer_dev_register(struct snd_device *dev)
968 struct snd_timer *timer = dev->device_data;
969 struct snd_timer *timer1;
971 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
973 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
974 !timer->hw.resolution && timer->hw.c_resolution == NULL)
977 mutex_lock(®ister_mutex);
978 list_for_each_entry(timer1, &snd_timer_list, device_list) {
979 if (timer1->tmr_class > timer->tmr_class)
981 if (timer1->tmr_class < timer->tmr_class)
983 if (timer1->card && timer->card) {
984 if (timer1->card->number > timer->card->number)
986 if (timer1->card->number < timer->card->number)
989 if (timer1->tmr_device > timer->tmr_device)
991 if (timer1->tmr_device < timer->tmr_device)
993 if (timer1->tmr_subdevice > timer->tmr_subdevice)
995 if (timer1->tmr_subdevice < timer->tmr_subdevice)
998 mutex_unlock(®ister_mutex);
1001 list_add_tail(&timer->device_list, &timer1->device_list);
1002 mutex_unlock(®ister_mutex);
1006 static int snd_timer_dev_disconnect(struct snd_device *device)
1008 struct snd_timer *timer = device->device_data;
1009 struct snd_timer_instance *ti;
1011 mutex_lock(®ister_mutex);
1012 list_del_init(&timer->device_list);
1013 /* wake up pending sleepers */
1014 list_for_each_entry(ti, &timer->open_list_head, open_list) {
1018 mutex_unlock(®ister_mutex);
1022 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
1024 unsigned long flags;
1025 unsigned long resolution = 0;
1026 struct snd_timer_instance *ti, *ts;
1028 if (timer->card && timer->card->shutdown)
1030 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
1032 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
1033 event > SNDRV_TIMER_EVENT_MRESUME))
1035 spin_lock_irqsave(&timer->lock, flags);
1036 if (event == SNDRV_TIMER_EVENT_MSTART ||
1037 event == SNDRV_TIMER_EVENT_MCONTINUE ||
1038 event == SNDRV_TIMER_EVENT_MRESUME) {
1039 if (timer->hw.c_resolution)
1040 resolution = timer->hw.c_resolution(timer);
1042 resolution = timer->hw.resolution;
1044 list_for_each_entry(ti, &timer->active_list_head, active_list) {
1046 ti->ccallback(ti, event, tstamp, resolution);
1047 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1049 ts->ccallback(ts, event, tstamp, resolution);
1051 spin_unlock_irqrestore(&timer->lock, flags);
1053 EXPORT_SYMBOL(snd_timer_notify);
1056 * exported functions for global timers
1058 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1060 struct snd_timer_id tid;
1062 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1063 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1065 tid.device = device;
1067 return snd_timer_new(NULL, id, &tid, rtimer);
1069 EXPORT_SYMBOL(snd_timer_global_new);
1071 int snd_timer_global_free(struct snd_timer *timer)
1073 return snd_timer_free(timer);
1075 EXPORT_SYMBOL(snd_timer_global_free);
1077 int snd_timer_global_register(struct snd_timer *timer)
1079 struct snd_device dev;
1081 memset(&dev, 0, sizeof(dev));
1082 dev.device_data = timer;
1083 return snd_timer_dev_register(&dev);
1085 EXPORT_SYMBOL(snd_timer_global_register);
1091 struct snd_timer_system_private {
1092 struct timer_list tlist;
1093 unsigned long last_expires;
1094 unsigned long last_jiffies;
1095 unsigned long correction;
1098 static void snd_timer_s_function(unsigned long data)
1100 struct snd_timer *timer = (struct snd_timer *)data;
1101 struct snd_timer_system_private *priv = timer->private_data;
1102 unsigned long jiff = jiffies;
1103 if (time_after(jiff, priv->last_expires))
1104 priv->correction += (long)jiff - (long)priv->last_expires;
1105 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1108 static int snd_timer_s_start(struct snd_timer * timer)
1110 struct snd_timer_system_private *priv;
1111 unsigned long njiff;
1113 priv = (struct snd_timer_system_private *) timer->private_data;
1114 njiff = (priv->last_jiffies = jiffies);
1115 if (priv->correction > timer->sticks - 1) {
1116 priv->correction -= timer->sticks - 1;
1119 njiff += timer->sticks - priv->correction;
1120 priv->correction = 0;
1122 priv->last_expires = njiff;
1123 mod_timer(&priv->tlist, njiff);
1127 static int snd_timer_s_stop(struct snd_timer * timer)
1129 struct snd_timer_system_private *priv;
1132 priv = (struct snd_timer_system_private *) timer->private_data;
1133 del_timer(&priv->tlist);
1135 if (time_before(jiff, priv->last_expires))
1136 timer->sticks = priv->last_expires - jiff;
1139 priv->correction = 0;
1143 static int snd_timer_s_close(struct snd_timer *timer)
1145 struct snd_timer_system_private *priv;
1147 priv = (struct snd_timer_system_private *)timer->private_data;
1148 del_timer_sync(&priv->tlist);
1152 static struct snd_timer_hardware snd_timer_system =
1154 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1155 .resolution = 1000000000L / HZ,
1157 .close = snd_timer_s_close,
1158 .start = snd_timer_s_start,
1159 .stop = snd_timer_s_stop
1162 static void snd_timer_free_system(struct snd_timer *timer)
1164 kfree(timer->private_data);
1167 static int snd_timer_register_system(void)
1169 struct snd_timer *timer;
1170 struct snd_timer_system_private *priv;
1173 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1176 strcpy(timer->name, "system timer");
1177 timer->hw = snd_timer_system;
1178 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1180 snd_timer_free(timer);
1183 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1184 timer->private_data = priv;
1185 timer->private_free = snd_timer_free_system;
1186 return snd_timer_global_register(timer);
1189 #ifdef CONFIG_SND_PROC_FS
1194 static void snd_timer_proc_read(struct snd_info_entry *entry,
1195 struct snd_info_buffer *buffer)
1197 struct snd_timer *timer;
1198 struct snd_timer_instance *ti;
1200 mutex_lock(®ister_mutex);
1201 list_for_each_entry(timer, &snd_timer_list, device_list) {
1202 if (timer->card && timer->card->shutdown)
1204 switch (timer->tmr_class) {
1205 case SNDRV_TIMER_CLASS_GLOBAL:
1206 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1208 case SNDRV_TIMER_CLASS_CARD:
1209 snd_iprintf(buffer, "C%i-%i: ",
1210 timer->card->number, timer->tmr_device);
1212 case SNDRV_TIMER_CLASS_PCM:
1213 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1214 timer->tmr_device, timer->tmr_subdevice);
1217 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1218 timer->card ? timer->card->number : -1,
1219 timer->tmr_device, timer->tmr_subdevice);
1221 snd_iprintf(buffer, "%s :", timer->name);
1222 if (timer->hw.resolution)
1223 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1224 timer->hw.resolution / 1000,
1225 timer->hw.resolution % 1000,
1227 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1228 snd_iprintf(buffer, " SLAVE");
1229 snd_iprintf(buffer, "\n");
1230 list_for_each_entry(ti, &timer->open_list_head, open_list)
1231 snd_iprintf(buffer, " Client %s : %s\n",
1232 ti->owner ? ti->owner : "unknown",
1233 ti->flags & (SNDRV_TIMER_IFLG_START |
1234 SNDRV_TIMER_IFLG_RUNNING)
1235 ? "running" : "stopped");
1237 mutex_unlock(®ister_mutex);
1240 static struct snd_info_entry *snd_timer_proc_entry;
1242 static void __init snd_timer_proc_init(void)
1244 struct snd_info_entry *entry;
1246 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1247 if (entry != NULL) {
1248 entry->c.text.read = snd_timer_proc_read;
1249 if (snd_info_register(entry) < 0) {
1250 snd_info_free_entry(entry);
1254 snd_timer_proc_entry = entry;
1257 static void __exit snd_timer_proc_done(void)
1259 snd_info_free_entry(snd_timer_proc_entry);
1261 #else /* !CONFIG_SND_PROC_FS */
1262 #define snd_timer_proc_init()
1263 #define snd_timer_proc_done()
1267 * USER SPACE interface
1270 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1271 unsigned long resolution,
1272 unsigned long ticks)
1274 struct snd_timer_user *tu = timeri->callback_data;
1275 struct snd_timer_read *r;
1278 spin_lock(&tu->qlock);
1279 if (tu->qused > 0) {
1280 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1281 r = &tu->queue[prev];
1282 if (r->resolution == resolution) {
1287 if (tu->qused >= tu->queue_size) {
1290 r = &tu->queue[tu->qtail++];
1291 tu->qtail %= tu->queue_size;
1292 r->resolution = resolution;
1297 spin_unlock(&tu->qlock);
1298 snd_kill_fasync(tu->fasync, SIGIO, POLL_IN);
1299 wake_up(&tu->qchange_sleep);
1302 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1303 struct snd_timer_tread *tread)
1305 if (tu->qused >= tu->queue_size) {
1308 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1309 tu->qtail %= tu->queue_size;
1314 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1316 struct timespec *tstamp,
1317 unsigned long resolution)
1319 struct snd_timer_user *tu = timeri->callback_data;
1320 struct snd_timer_tread r1;
1321 unsigned long flags;
1323 if (event >= SNDRV_TIMER_EVENT_START &&
1324 event <= SNDRV_TIMER_EVENT_PAUSE)
1325 tu->tstamp = *tstamp;
1326 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1328 memset(&r1, 0, sizeof(r1));
1330 r1.tstamp = *tstamp;
1331 r1.val = resolution;
1332 spin_lock_irqsave(&tu->qlock, flags);
1333 snd_timer_user_append_to_tqueue(tu, &r1);
1334 spin_unlock_irqrestore(&tu->qlock, flags);
1335 snd_kill_fasync(tu->fasync, SIGIO, POLL_IN);
1336 wake_up(&tu->qchange_sleep);
1339 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1341 struct snd_timer_user *tu = timeri->callback_data;
1343 tu->disconnected = true;
1344 wake_up(&tu->qchange_sleep);
1347 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1348 unsigned long resolution,
1349 unsigned long ticks)
1351 struct snd_timer_user *tu = timeri->callback_data;
1352 struct snd_timer_tread *r, r1;
1353 struct timespec tstamp;
1354 int prev, append = 0;
1356 memset(&r1, 0, sizeof(r1));
1357 memset(&tstamp, 0, sizeof(tstamp));
1358 spin_lock(&tu->qlock);
1359 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1360 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1361 spin_unlock(&tu->qlock);
1364 if (tu->last_resolution != resolution || ticks > 0) {
1365 if (timer_tstamp_monotonic)
1366 ktime_get_ts(&tstamp);
1368 getnstimeofday(&tstamp);
1370 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1371 tu->last_resolution != resolution) {
1372 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1374 r1.val = resolution;
1375 snd_timer_user_append_to_tqueue(tu, &r1);
1376 tu->last_resolution = resolution;
1379 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1383 if (tu->qused > 0) {
1384 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1385 r = &tu->tqueue[prev];
1386 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1393 r1.event = SNDRV_TIMER_EVENT_TICK;
1396 snd_timer_user_append_to_tqueue(tu, &r1);
1399 spin_unlock(&tu->qlock);
1402 snd_kill_fasync(tu->fasync, SIGIO, POLL_IN);
1403 wake_up(&tu->qchange_sleep);
1406 static int realloc_user_queue(struct snd_timer_user *tu, int size)
1408 struct snd_timer_read *queue = NULL;
1409 struct snd_timer_tread *tqueue = NULL;
1412 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1416 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1421 spin_lock_irq(&tu->qlock);
1424 tu->queue_size = size;
1426 tu->tqueue = tqueue;
1427 tu->qhead = tu->qtail = tu->qused = 0;
1428 spin_unlock_irq(&tu->qlock);
1433 static int snd_timer_user_open(struct inode *inode, struct file *file)
1435 struct snd_timer_user *tu;
1438 err = nonseekable_open(inode, file);
1442 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1445 spin_lock_init(&tu->qlock);
1446 init_waitqueue_head(&tu->qchange_sleep);
1447 mutex_init(&tu->ioctl_lock);
1449 if (realloc_user_queue(tu, 128) < 0) {
1453 file->private_data = tu;
1457 static int snd_timer_user_release(struct inode *inode, struct file *file)
1459 struct snd_timer_user *tu;
1461 if (file->private_data) {
1462 tu = file->private_data;
1463 file->private_data = NULL;
1464 mutex_lock(&tu->ioctl_lock);
1466 snd_timer_close(tu->timeri);
1467 mutex_unlock(&tu->ioctl_lock);
1468 snd_fasync_free(tu->fasync);
1476 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1478 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1479 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1485 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1487 id->dev_class = timer->tmr_class;
1488 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1489 id->card = timer->card ? timer->card->number : -1;
1490 id->device = timer->tmr_device;
1491 id->subdevice = timer->tmr_subdevice;
1494 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1496 struct snd_timer_id id;
1497 struct snd_timer *timer;
1498 struct list_head *p;
1500 if (copy_from_user(&id, _tid, sizeof(id)))
1502 mutex_lock(®ister_mutex);
1503 if (id.dev_class < 0) { /* first item */
1504 if (list_empty(&snd_timer_list))
1505 snd_timer_user_zero_id(&id);
1507 timer = list_entry(snd_timer_list.next,
1508 struct snd_timer, device_list);
1509 snd_timer_user_copy_id(&id, timer);
1512 switch (id.dev_class) {
1513 case SNDRV_TIMER_CLASS_GLOBAL:
1514 id.device = id.device < 0 ? 0 : id.device + 1;
1515 list_for_each(p, &snd_timer_list) {
1516 timer = list_entry(p, struct snd_timer, device_list);
1517 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1518 snd_timer_user_copy_id(&id, timer);
1521 if (timer->tmr_device >= id.device) {
1522 snd_timer_user_copy_id(&id, timer);
1526 if (p == &snd_timer_list)
1527 snd_timer_user_zero_id(&id);
1529 case SNDRV_TIMER_CLASS_CARD:
1530 case SNDRV_TIMER_CLASS_PCM:
1534 if (id.device < 0) {
1537 if (id.subdevice < 0)
1539 else if (id.subdevice < INT_MAX)
1543 list_for_each(p, &snd_timer_list) {
1544 timer = list_entry(p, struct snd_timer, device_list);
1545 if (timer->tmr_class > id.dev_class) {
1546 snd_timer_user_copy_id(&id, timer);
1549 if (timer->tmr_class < id.dev_class)
1551 if (timer->card->number > id.card) {
1552 snd_timer_user_copy_id(&id, timer);
1555 if (timer->card->number < id.card)
1557 if (timer->tmr_device > id.device) {
1558 snd_timer_user_copy_id(&id, timer);
1561 if (timer->tmr_device < id.device)
1563 if (timer->tmr_subdevice > id.subdevice) {
1564 snd_timer_user_copy_id(&id, timer);
1567 if (timer->tmr_subdevice < id.subdevice)
1569 snd_timer_user_copy_id(&id, timer);
1572 if (p == &snd_timer_list)
1573 snd_timer_user_zero_id(&id);
1576 snd_timer_user_zero_id(&id);
1579 mutex_unlock(®ister_mutex);
1580 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1585 static int snd_timer_user_ginfo(struct file *file,
1586 struct snd_timer_ginfo __user *_ginfo)
1588 struct snd_timer_ginfo *ginfo;
1589 struct snd_timer_id tid;
1590 struct snd_timer *t;
1591 struct list_head *p;
1594 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1596 return PTR_ERR(ginfo);
1599 memset(ginfo, 0, sizeof(*ginfo));
1601 mutex_lock(®ister_mutex);
1602 t = snd_timer_find(&tid);
1604 ginfo->card = t->card ? t->card->number : -1;
1605 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1606 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1607 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1608 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1609 ginfo->resolution = t->hw.resolution;
1610 if (t->hw.resolution_min > 0) {
1611 ginfo->resolution_min = t->hw.resolution_min;
1612 ginfo->resolution_max = t->hw.resolution_max;
1614 list_for_each(p, &t->open_list_head) {
1620 mutex_unlock(®ister_mutex);
1621 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1627 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1629 struct snd_timer *t;
1632 mutex_lock(®ister_mutex);
1633 t = snd_timer_find(&gparams->tid);
1638 if (!list_empty(&t->open_list_head)) {
1642 if (!t->hw.set_period) {
1646 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1648 mutex_unlock(®ister_mutex);
1652 static int snd_timer_user_gparams(struct file *file,
1653 struct snd_timer_gparams __user *_gparams)
1655 struct snd_timer_gparams gparams;
1657 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1659 return timer_set_gparams(&gparams);
1662 static int snd_timer_user_gstatus(struct file *file,
1663 struct snd_timer_gstatus __user *_gstatus)
1665 struct snd_timer_gstatus gstatus;
1666 struct snd_timer_id tid;
1667 struct snd_timer *t;
1670 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1673 memset(&gstatus, 0, sizeof(gstatus));
1675 mutex_lock(®ister_mutex);
1676 t = snd_timer_find(&tid);
1678 if (t->hw.c_resolution)
1679 gstatus.resolution = t->hw.c_resolution(t);
1681 gstatus.resolution = t->hw.resolution;
1682 if (t->hw.precise_resolution) {
1683 t->hw.precise_resolution(t, &gstatus.resolution_num,
1684 &gstatus.resolution_den);
1686 gstatus.resolution_num = gstatus.resolution;
1687 gstatus.resolution_den = 1000000000uL;
1692 mutex_unlock(®ister_mutex);
1693 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1698 static int snd_timer_user_tselect(struct file *file,
1699 struct snd_timer_select __user *_tselect)
1701 struct snd_timer_user *tu;
1702 struct snd_timer_select tselect;
1706 tu = file->private_data;
1708 snd_timer_close(tu->timeri);
1711 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1715 sprintf(str, "application %i", current->pid);
1716 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1717 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1718 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1722 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1723 tu->timeri->callback = tu->tread
1724 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1725 tu->timeri->ccallback = snd_timer_user_ccallback;
1726 tu->timeri->callback_data = (void *)tu;
1727 tu->timeri->disconnect = snd_timer_user_disconnect;
1733 static int snd_timer_user_info(struct file *file,
1734 struct snd_timer_info __user *_info)
1736 struct snd_timer_user *tu;
1737 struct snd_timer_info *info;
1738 struct snd_timer *t;
1741 tu = file->private_data;
1744 t = tu->timeri->timer;
1748 info = kzalloc(sizeof(*info), GFP_KERNEL);
1751 info->card = t->card ? t->card->number : -1;
1752 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1753 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1754 strlcpy(info->id, t->id, sizeof(info->id));
1755 strlcpy(info->name, t->name, sizeof(info->name));
1756 info->resolution = t->hw.resolution;
1757 if (copy_to_user(_info, info, sizeof(*_info)))
1763 static int snd_timer_user_params(struct file *file,
1764 struct snd_timer_params __user *_params)
1766 struct snd_timer_user *tu;
1767 struct snd_timer_params params;
1768 struct snd_timer *t;
1771 tu = file->private_data;
1774 t = tu->timeri->timer;
1777 if (copy_from_user(¶ms, _params, sizeof(params)))
1779 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1782 if (params.ticks < 1) {
1787 /* Don't allow resolution less than 1ms */
1788 resolution = snd_timer_resolution(tu->timeri);
1789 resolution *= params.ticks;
1790 if (resolution < 1000000) {
1795 if (params.queue_size > 0 &&
1796 (params.queue_size < 32 || params.queue_size > 1024)) {
1800 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1801 (1<<SNDRV_TIMER_EVENT_TICK)|
1802 (1<<SNDRV_TIMER_EVENT_START)|
1803 (1<<SNDRV_TIMER_EVENT_STOP)|
1804 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1805 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1806 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1807 (1<<SNDRV_TIMER_EVENT_RESUME)|
1808 (1<<SNDRV_TIMER_EVENT_MSTART)|
1809 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1810 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1811 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1812 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1813 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1817 snd_timer_stop(tu->timeri);
1818 spin_lock_irq(&t->lock);
1819 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1820 SNDRV_TIMER_IFLG_EXCLUSIVE|
1821 SNDRV_TIMER_IFLG_EARLY_EVENT);
1822 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1823 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1824 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1825 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1826 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1827 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1828 spin_unlock_irq(&t->lock);
1829 if (params.queue_size > 0 &&
1830 (unsigned int)tu->queue_size != params.queue_size) {
1831 err = realloc_user_queue(tu, params.queue_size);
1835 spin_lock_irq(&tu->qlock);
1836 tu->qhead = tu->qtail = tu->qused = 0;
1837 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1839 struct snd_timer_tread tread;
1840 memset(&tread, 0, sizeof(tread));
1841 tread.event = SNDRV_TIMER_EVENT_EARLY;
1842 tread.tstamp.tv_sec = 0;
1843 tread.tstamp.tv_nsec = 0;
1845 snd_timer_user_append_to_tqueue(tu, &tread);
1847 struct snd_timer_read *r = &tu->queue[0];
1854 tu->filter = params.filter;
1855 tu->ticks = params.ticks;
1856 spin_unlock_irq(&tu->qlock);
1859 if (copy_to_user(_params, ¶ms, sizeof(params)))
1864 static int snd_timer_user_status(struct file *file,
1865 struct snd_timer_status __user *_status)
1867 struct snd_timer_user *tu;
1868 struct snd_timer_status status;
1870 tu = file->private_data;
1873 memset(&status, 0, sizeof(status));
1874 status.tstamp = tu->tstamp;
1875 status.resolution = snd_timer_resolution(tu->timeri);
1876 status.lost = tu->timeri->lost;
1877 status.overrun = tu->overrun;
1878 spin_lock_irq(&tu->qlock);
1879 status.queue = tu->qused;
1880 spin_unlock_irq(&tu->qlock);
1881 if (copy_to_user(_status, &status, sizeof(status)))
1886 static int snd_timer_user_start(struct file *file)
1889 struct snd_timer_user *tu;
1891 tu = file->private_data;
1894 snd_timer_stop(tu->timeri);
1895 tu->timeri->lost = 0;
1896 tu->last_resolution = 0;
1897 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1900 static int snd_timer_user_stop(struct file *file)
1903 struct snd_timer_user *tu;
1905 tu = file->private_data;
1908 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1911 static int snd_timer_user_continue(struct file *file)
1914 struct snd_timer_user *tu;
1916 tu = file->private_data;
1919 /* start timer instead of continue if it's not used before */
1920 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1921 return snd_timer_user_start(file);
1922 tu->timeri->lost = 0;
1923 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1926 static int snd_timer_user_pause(struct file *file)
1929 struct snd_timer_user *tu;
1931 tu = file->private_data;
1934 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1938 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1939 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1940 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1941 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1944 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1947 struct snd_timer_user *tu;
1948 void __user *argp = (void __user *)arg;
1949 int __user *p = argp;
1951 tu = file->private_data;
1953 case SNDRV_TIMER_IOCTL_PVERSION:
1954 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1955 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1956 return snd_timer_user_next_device(argp);
1957 case SNDRV_TIMER_IOCTL_TREAD:
1959 int xarg, old_tread;
1961 if (tu->timeri) /* too late */
1963 if (get_user(xarg, p))
1965 old_tread = tu->tread;
1966 tu->tread = xarg ? 1 : 0;
1967 if (tu->tread != old_tread &&
1968 realloc_user_queue(tu, tu->queue_size) < 0) {
1969 tu->tread = old_tread;
1974 case SNDRV_TIMER_IOCTL_GINFO:
1975 return snd_timer_user_ginfo(file, argp);
1976 case SNDRV_TIMER_IOCTL_GPARAMS:
1977 return snd_timer_user_gparams(file, argp);
1978 case SNDRV_TIMER_IOCTL_GSTATUS:
1979 return snd_timer_user_gstatus(file, argp);
1980 case SNDRV_TIMER_IOCTL_SELECT:
1981 return snd_timer_user_tselect(file, argp);
1982 case SNDRV_TIMER_IOCTL_INFO:
1983 return snd_timer_user_info(file, argp);
1984 case SNDRV_TIMER_IOCTL_PARAMS:
1985 return snd_timer_user_params(file, argp);
1986 case SNDRV_TIMER_IOCTL_STATUS:
1987 return snd_timer_user_status(file, argp);
1988 case SNDRV_TIMER_IOCTL_START:
1989 case SNDRV_TIMER_IOCTL_START_OLD:
1990 return snd_timer_user_start(file);
1991 case SNDRV_TIMER_IOCTL_STOP:
1992 case SNDRV_TIMER_IOCTL_STOP_OLD:
1993 return snd_timer_user_stop(file);
1994 case SNDRV_TIMER_IOCTL_CONTINUE:
1995 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1996 return snd_timer_user_continue(file);
1997 case SNDRV_TIMER_IOCTL_PAUSE:
1998 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1999 return snd_timer_user_pause(file);
2004 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
2007 struct snd_timer_user *tu = file->private_data;
2010 mutex_lock(&tu->ioctl_lock);
2011 ret = __snd_timer_user_ioctl(file, cmd, arg);
2012 mutex_unlock(&tu->ioctl_lock);
2016 static int snd_timer_user_fasync(int fd, struct file * file, int on)
2018 struct snd_timer_user *tu;
2020 tu = file->private_data;
2021 return snd_fasync_helper(fd, file, on, &tu->fasync);
2024 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
2025 size_t count, loff_t *offset)
2027 struct snd_timer_user *tu;
2028 long result = 0, unit;
2032 tu = file->private_data;
2033 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
2034 mutex_lock(&tu->ioctl_lock);
2035 spin_lock_irq(&tu->qlock);
2036 while ((long)count - result >= unit) {
2037 while (!tu->qused) {
2038 wait_queue_entry_t wait;
2040 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
2045 set_current_state(TASK_INTERRUPTIBLE);
2046 init_waitqueue_entry(&wait, current);
2047 add_wait_queue(&tu->qchange_sleep, &wait);
2049 spin_unlock_irq(&tu->qlock);
2050 mutex_unlock(&tu->ioctl_lock);
2052 mutex_lock(&tu->ioctl_lock);
2053 spin_lock_irq(&tu->qlock);
2055 remove_wait_queue(&tu->qchange_sleep, &wait);
2057 if (tu->disconnected) {
2061 if (signal_pending(current)) {
2067 qhead = tu->qhead++;
2068 tu->qhead %= tu->queue_size;
2070 spin_unlock_irq(&tu->qlock);
2073 if (copy_to_user(buffer, &tu->tqueue[qhead],
2074 sizeof(struct snd_timer_tread)))
2077 if (copy_to_user(buffer, &tu->queue[qhead],
2078 sizeof(struct snd_timer_read)))
2082 spin_lock_irq(&tu->qlock);
2089 spin_unlock_irq(&tu->qlock);
2090 mutex_unlock(&tu->ioctl_lock);
2091 return result > 0 ? result : err;
2094 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
2097 struct snd_timer_user *tu;
2099 tu = file->private_data;
2101 poll_wait(file, &tu->qchange_sleep, wait);
2104 spin_lock_irq(&tu->qlock);
2106 mask |= POLLIN | POLLRDNORM;
2107 if (tu->disconnected)
2109 spin_unlock_irq(&tu->qlock);
2114 #ifdef CONFIG_COMPAT
2115 #include "timer_compat.c"
2117 #define snd_timer_user_ioctl_compat NULL
2120 static const struct file_operations snd_timer_f_ops =
2122 .owner = THIS_MODULE,
2123 .read = snd_timer_user_read,
2124 .open = snd_timer_user_open,
2125 .release = snd_timer_user_release,
2126 .llseek = no_llseek,
2127 .poll = snd_timer_user_poll,
2128 .unlocked_ioctl = snd_timer_user_ioctl,
2129 .compat_ioctl = snd_timer_user_ioctl_compat,
2130 .fasync = snd_timer_user_fasync,
2133 /* unregister the system timer */
2134 static void snd_timer_free_all(void)
2136 struct snd_timer *timer, *n;
2138 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2139 snd_timer_free(timer);
2142 static struct device timer_dev;
2148 static int __init alsa_timer_init(void)
2152 snd_device_initialize(&timer_dev, NULL);
2153 dev_set_name(&timer_dev, "timer");
2155 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2156 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2160 err = snd_timer_register_system();
2162 pr_err("ALSA: unable to register system timer (%i)\n", err);
2166 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2167 &snd_timer_f_ops, NULL, &timer_dev);
2169 pr_err("ALSA: unable to register timer device (%i)\n", err);
2170 snd_timer_free_all();
2174 snd_timer_proc_init();
2178 put_device(&timer_dev);
2182 static void __exit alsa_timer_exit(void)
2184 snd_unregister_device(&timer_dev);
2185 snd_timer_free_all();
2186 put_device(&timer_dev);
2187 snd_timer_proc_done();
2188 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2189 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2193 module_init(alsa_timer_init)
2194 module_exit(alsa_timer_exit)