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/module.h>
28 #include <linux/string.h>
29 #include <sound/core.h>
30 #include <sound/timer.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33 #include <sound/minors.h>
34 #include <sound/initval.h>
35 #include <linux/kmod.h>
38 #define SNDRV_TIMER_IFLG_PAUSED 0x00010000
40 #if defined(CONFIG_SND_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE)
41 #define DEFAULT_TIMER_LIMIT 4
42 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
43 #define DEFAULT_TIMER_LIMIT 2
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;
70 struct snd_timer_read *queue;
71 struct snd_timer_tread *tqueue;
73 unsigned long last_resolution;
75 struct timespec tstamp; /* trigger tstamp */
76 wait_queue_head_t qchange_sleep;
77 struct fasync_struct *fasync;
78 struct mutex ioctl_lock;
82 static LIST_HEAD(snd_timer_list);
84 /* list of slave instances */
85 static LIST_HEAD(snd_timer_slave_list);
87 /* lock for slave active lists */
88 static DEFINE_SPINLOCK(slave_active_lock);
90 static DEFINE_MUTEX(register_mutex);
92 static int snd_timer_free(struct snd_timer *timer);
93 static int snd_timer_dev_free(struct snd_device *device);
94 static int snd_timer_dev_register(struct snd_device *device);
95 static int snd_timer_dev_disconnect(struct snd_device *device);
97 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
100 * create a timer instance with the given owner string.
101 * when timer is not NULL, increments the module counter
103 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
104 struct snd_timer *timer)
106 struct snd_timer_instance *timeri;
107 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
110 timeri->owner = kstrdup(owner, GFP_KERNEL);
111 if (! timeri->owner) {
115 INIT_LIST_HEAD(&timeri->open_list);
116 INIT_LIST_HEAD(&timeri->active_list);
117 INIT_LIST_HEAD(&timeri->ack_list);
118 INIT_LIST_HEAD(&timeri->slave_list_head);
119 INIT_LIST_HEAD(&timeri->slave_active_head);
121 timeri->timer = timer;
122 if (timer && !try_module_get(timer->module)) {
123 kfree(timeri->owner);
132 * find a timer instance from the given timer id
134 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
136 struct snd_timer *timer = NULL;
138 list_for_each_entry(timer, &snd_timer_list, device_list) {
139 if (timer->tmr_class != tid->dev_class)
141 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
142 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
143 (timer->card == NULL ||
144 timer->card->number != tid->card))
146 if (timer->tmr_device != tid->device)
148 if (timer->tmr_subdevice != tid->subdevice)
155 #ifdef CONFIG_MODULES
157 static void snd_timer_request(struct snd_timer_id *tid)
159 switch (tid->dev_class) {
160 case SNDRV_TIMER_CLASS_GLOBAL:
161 if (tid->device < timer_limit)
162 request_module("snd-timer-%i", tid->device);
164 case SNDRV_TIMER_CLASS_CARD:
165 case SNDRV_TIMER_CLASS_PCM:
166 if (tid->card < snd_ecards_limit)
167 request_module("snd-card-%i", tid->card);
177 * look for a master instance matching with the slave id of the given slave.
178 * when found, relink the open_link of the slave.
180 * call this with register_mutex down.
182 static void snd_timer_check_slave(struct snd_timer_instance *slave)
184 struct snd_timer *timer;
185 struct snd_timer_instance *master;
187 /* FIXME: it's really dumb to look up all entries.. */
188 list_for_each_entry(timer, &snd_timer_list, device_list) {
189 list_for_each_entry(master, &timer->open_list_head, open_list) {
190 if (slave->slave_class == master->slave_class &&
191 slave->slave_id == master->slave_id) {
192 list_move_tail(&slave->open_list,
193 &master->slave_list_head);
194 spin_lock_irq(&slave_active_lock);
195 slave->master = master;
196 slave->timer = master->timer;
197 spin_unlock_irq(&slave_active_lock);
205 * look for slave instances matching with the slave id of the given master.
206 * when found, relink the open_link of slaves.
208 * call this with register_mutex down.
210 static void snd_timer_check_master(struct snd_timer_instance *master)
212 struct snd_timer_instance *slave, *tmp;
214 /* check all pending slaves */
215 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
216 if (slave->slave_class == master->slave_class &&
217 slave->slave_id == master->slave_id) {
218 list_move_tail(&slave->open_list, &master->slave_list_head);
219 spin_lock_irq(&slave_active_lock);
220 spin_lock(&master->timer->lock);
221 slave->master = master;
222 slave->timer = master->timer;
223 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
224 list_add_tail(&slave->active_list,
225 &master->slave_active_head);
226 spin_unlock(&master->timer->lock);
227 spin_unlock_irq(&slave_active_lock);
233 * open a timer instance
234 * when opening a master, the slave id must be here given.
236 int snd_timer_open(struct snd_timer_instance **ti,
237 char *owner, struct snd_timer_id *tid,
238 unsigned int slave_id)
240 struct snd_timer *timer;
241 struct snd_timer_instance *timeri = NULL;
243 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
244 /* open a slave instance */
245 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
246 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
247 snd_printd("invalid slave class %i\n", tid->dev_sclass);
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 timeri->slave_class = tid->dev_sclass;
295 timeri->slave_id = slave_id;
297 if (list_empty(&timer->open_list_head) && timer->hw.open) {
298 int err = timer->hw.open(timer);
300 kfree(timeri->owner);
303 module_put(timer->module);
304 mutex_unlock(®ister_mutex);
309 list_add_tail(&timeri->open_list, &timer->open_list_head);
310 snd_timer_check_master(timeri);
311 mutex_unlock(®ister_mutex);
316 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event);
319 * close a timer instance
321 int snd_timer_close(struct snd_timer_instance *timeri)
323 struct snd_timer *timer = NULL;
324 struct snd_timer_instance *slave, *tmp;
326 if (snd_BUG_ON(!timeri))
329 /* force to stop the timer */
330 snd_timer_stop(timeri);
332 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
333 /* wait, until the active callback is finished */
334 spin_lock_irq(&slave_active_lock);
335 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
336 spin_unlock_irq(&slave_active_lock);
338 spin_lock_irq(&slave_active_lock);
340 spin_unlock_irq(&slave_active_lock);
341 mutex_lock(®ister_mutex);
342 list_del(&timeri->open_list);
343 mutex_unlock(®ister_mutex);
345 timer = timeri->timer;
346 if (snd_BUG_ON(!timer))
348 /* wait, until the active callback is finished */
349 spin_lock_irq(&timer->lock);
350 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
351 spin_unlock_irq(&timer->lock);
353 spin_lock_irq(&timer->lock);
355 spin_unlock_irq(&timer->lock);
356 mutex_lock(®ister_mutex);
357 list_del(&timeri->open_list);
358 if (list_empty(&timer->open_list_head) &&
360 timer->hw.close(timer);
361 /* remove slave links */
362 spin_lock_irq(&slave_active_lock);
363 spin_lock(&timer->lock);
364 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
366 list_move_tail(&slave->open_list, &snd_timer_slave_list);
367 slave->master = NULL;
369 list_del_init(&slave->ack_list);
370 list_del_init(&slave->active_list);
372 spin_unlock(&timer->lock);
373 spin_unlock_irq(&slave_active_lock);
374 mutex_unlock(®ister_mutex);
377 if (timeri->private_free)
378 timeri->private_free(timeri);
379 kfree(timeri->owner);
382 module_put(timer->module);
386 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
388 struct snd_timer * timer;
392 if ((timer = timeri->timer) != NULL) {
393 if (timer->hw.c_resolution)
394 return timer->hw.c_resolution(timer);
395 return timer->hw.resolution;
400 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
402 struct snd_timer *timer;
404 unsigned long resolution = 0;
405 struct snd_timer_instance *ts;
406 struct timespec tstamp;
408 if (timer_tstamp_monotonic)
409 do_posix_clock_monotonic_gettime(&tstamp);
411 getnstimeofday(&tstamp);
412 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
413 event > SNDRV_TIMER_EVENT_PAUSE))
415 if (event == SNDRV_TIMER_EVENT_START ||
416 event == SNDRV_TIMER_EVENT_CONTINUE)
417 resolution = snd_timer_resolution(ti);
419 ti->ccallback(ti, event, &tstamp, resolution);
420 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
425 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
427 spin_lock_irqsave(&timer->lock, flags);
428 list_for_each_entry(ts, &ti->slave_active_head, active_list)
430 ts->ccallback(ts, event + 100, &tstamp, resolution);
431 spin_unlock_irqrestore(&timer->lock, flags);
434 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
435 unsigned long sticks)
437 list_move_tail(&timeri->active_list, &timer->active_list_head);
438 if (timer->running) {
439 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
441 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
442 timeri->flags |= SNDRV_TIMER_IFLG_START;
443 return 1; /* delayed start */
445 timer->sticks = sticks;
446 timer->hw.start(timer);
449 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
454 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
458 spin_lock_irqsave(&slave_active_lock, flags);
459 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
460 spin_unlock_irqrestore(&slave_active_lock, flags);
463 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
464 if (timeri->master && timeri->timer) {
465 spin_lock(&timeri->timer->lock);
466 list_add_tail(&timeri->active_list,
467 &timeri->master->slave_active_head);
468 spin_unlock(&timeri->timer->lock);
470 spin_unlock_irqrestore(&slave_active_lock, flags);
471 return 1; /* delayed start */
475 * start the timer instance
477 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
479 struct snd_timer *timer;
480 int result = -EINVAL;
483 if (timeri == NULL || ticks < 1)
485 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
486 result = snd_timer_start_slave(timeri);
488 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
491 timer = timeri->timer;
494 spin_lock_irqsave(&timer->lock, flags);
495 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
496 SNDRV_TIMER_IFLG_START)) {
500 timeri->ticks = timeri->cticks = ticks;
502 result = snd_timer_start1(timer, timeri, ticks);
504 spin_unlock_irqrestore(&timer->lock, flags);
506 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
510 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event)
512 struct snd_timer *timer;
515 if (snd_BUG_ON(!timeri))
518 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
519 spin_lock_irqsave(&slave_active_lock, flags);
520 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
521 spin_unlock_irqrestore(&slave_active_lock, flags);
525 spin_lock(&timeri->timer->lock);
526 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
527 list_del_init(&timeri->ack_list);
528 list_del_init(&timeri->active_list);
530 spin_unlock(&timeri->timer->lock);
531 spin_unlock_irqrestore(&slave_active_lock, flags);
534 timer = timeri->timer;
537 spin_lock_irqsave(&timer->lock, flags);
538 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
539 SNDRV_TIMER_IFLG_START))) {
540 spin_unlock_irqrestore(&timer->lock, flags);
543 list_del_init(&timeri->ack_list);
544 list_del_init(&timeri->active_list);
545 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
546 !(--timer->running)) {
547 timer->hw.stop(timer);
548 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
549 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
550 snd_timer_reschedule(timer, 0);
551 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
552 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
553 timer->hw.start(timer);
557 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
558 if (event == SNDRV_TIMER_EVENT_STOP)
559 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
561 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
562 spin_unlock_irqrestore(&timer->lock, flags);
564 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
565 snd_timer_notify1(timeri, event);
570 * stop the timer instance.
572 * do not call this from the timer callback!
574 int snd_timer_stop(struct snd_timer_instance *timeri)
576 struct snd_timer *timer;
580 err = _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_STOP);
583 timer = timeri->timer;
586 spin_lock_irqsave(&timer->lock, flags);
587 timeri->cticks = timeri->ticks;
589 spin_unlock_irqrestore(&timer->lock, flags);
594 * start again.. the tick is kept.
596 int snd_timer_continue(struct snd_timer_instance *timeri)
598 struct snd_timer *timer;
599 int result = -EINVAL;
604 /* timer can continue only after pause */
605 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
608 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
609 return snd_timer_start_slave(timeri);
610 timer = timeri->timer;
613 spin_lock_irqsave(&timer->lock, flags);
614 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
621 result = snd_timer_start1(timer, timeri, timer->sticks);
623 spin_unlock_irqrestore(&timer->lock, flags);
624 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
629 * pause.. remember the ticks left
631 int snd_timer_pause(struct snd_timer_instance * timeri)
633 return _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_PAUSE);
637 * reschedule the timer
639 * start pending instances and check the scheduling ticks.
640 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
642 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
644 struct snd_timer_instance *ti;
645 unsigned long ticks = ~0UL;
647 list_for_each_entry(ti, &timer->active_list_head, active_list) {
648 if (ti->flags & SNDRV_TIMER_IFLG_START) {
649 ti->flags &= ~SNDRV_TIMER_IFLG_START;
650 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
653 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
654 if (ticks > ti->cticks)
659 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
662 if (ticks > timer->hw.ticks)
663 ticks = timer->hw.ticks;
664 if (ticks_left != ticks)
665 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
666 timer->sticks = ticks;
673 static void snd_timer_tasklet(unsigned long arg)
675 struct snd_timer *timer = (struct snd_timer *) arg;
676 struct snd_timer_instance *ti;
678 unsigned long resolution, ticks;
681 spin_lock_irqsave(&timer->lock, flags);
682 /* now process all callbacks */
683 while (!list_empty(&timer->sack_list_head)) {
684 p = timer->sack_list_head.next; /* get first item */
685 ti = list_entry(p, struct snd_timer_instance, ack_list);
687 /* remove from ack_list and make empty */
692 resolution = ti->resolution;
694 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
695 spin_unlock(&timer->lock);
697 ti->callback(ti, resolution, ticks);
698 spin_lock(&timer->lock);
699 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
701 spin_unlock_irqrestore(&timer->lock, flags);
707 * ticks_left is usually equal to timer->sticks.
710 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
712 struct snd_timer_instance *ti, *ts, *tmp;
713 unsigned long resolution, ticks;
714 struct list_head *p, *ack_list_head;
721 spin_lock_irqsave(&timer->lock, flags);
723 /* remember the current resolution */
724 if (timer->hw.c_resolution)
725 resolution = timer->hw.c_resolution(timer);
727 resolution = timer->hw.resolution;
729 /* loop for all active instances
730 * Here we cannot use list_for_each_entry because the active_list of a
731 * processed instance is relinked to done_list_head before the callback
734 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
736 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
738 ti->pticks += ticks_left;
739 ti->resolution = resolution;
740 if (ti->cticks < ticks_left)
743 ti->cticks -= ticks_left;
744 if (ti->cticks) /* not expired */
746 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
747 ti->cticks = ti->ticks;
749 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
751 list_del_init(&ti->active_list);
753 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
754 (ti->flags & SNDRV_TIMER_IFLG_FAST))
755 ack_list_head = &timer->ack_list_head;
757 ack_list_head = &timer->sack_list_head;
758 if (list_empty(&ti->ack_list))
759 list_add_tail(&ti->ack_list, ack_list_head);
760 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
761 ts->pticks = ti->pticks;
762 ts->resolution = resolution;
763 if (list_empty(&ts->ack_list))
764 list_add_tail(&ts->ack_list, ack_list_head);
767 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
768 snd_timer_reschedule(timer, timer->sticks);
769 if (timer->running) {
770 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
771 timer->hw.stop(timer);
772 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
774 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
775 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
777 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
778 timer->hw.start(timer);
781 timer->hw.stop(timer);
784 /* now process all fast callbacks */
785 while (!list_empty(&timer->ack_list_head)) {
786 p = timer->ack_list_head.next; /* get first item */
787 ti = list_entry(p, struct snd_timer_instance, ack_list);
789 /* remove from ack_list and make empty */
795 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
796 spin_unlock(&timer->lock);
798 ti->callback(ti, resolution, ticks);
799 spin_lock(&timer->lock);
800 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
803 /* do we have any slow callbacks? */
804 use_tasklet = !list_empty(&timer->sack_list_head);
805 spin_unlock_irqrestore(&timer->lock, flags);
808 tasklet_schedule(&timer->task_queue);
815 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
816 struct snd_timer **rtimer)
818 struct snd_timer *timer;
820 static struct snd_device_ops ops = {
821 .dev_free = snd_timer_dev_free,
822 .dev_register = snd_timer_dev_register,
823 .dev_disconnect = snd_timer_dev_disconnect,
826 if (snd_BUG_ON(!tid))
830 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
832 snd_printk(KERN_ERR "timer: cannot allocate\n");
835 timer->tmr_class = tid->dev_class;
837 timer->tmr_device = tid->device;
838 timer->tmr_subdevice = tid->subdevice;
840 strlcpy(timer->id, id, sizeof(timer->id));
842 INIT_LIST_HEAD(&timer->device_list);
843 INIT_LIST_HEAD(&timer->open_list_head);
844 INIT_LIST_HEAD(&timer->active_list_head);
845 INIT_LIST_HEAD(&timer->ack_list_head);
846 INIT_LIST_HEAD(&timer->sack_list_head);
847 spin_lock_init(&timer->lock);
848 tasklet_init(&timer->task_queue, snd_timer_tasklet,
849 (unsigned long)timer);
851 timer->module = card->module;
852 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
854 snd_timer_free(timer);
863 static int snd_timer_free(struct snd_timer *timer)
868 mutex_lock(®ister_mutex);
869 if (! list_empty(&timer->open_list_head)) {
870 struct list_head *p, *n;
871 struct snd_timer_instance *ti;
872 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
873 list_for_each_safe(p, n, &timer->open_list_head) {
875 ti = list_entry(p, struct snd_timer_instance, open_list);
879 list_del(&timer->device_list);
880 mutex_unlock(®ister_mutex);
882 if (timer->private_free)
883 timer->private_free(timer);
888 static int snd_timer_dev_free(struct snd_device *device)
890 struct snd_timer *timer = device->device_data;
891 return snd_timer_free(timer);
894 static int snd_timer_dev_register(struct snd_device *dev)
896 struct snd_timer *timer = dev->device_data;
897 struct snd_timer *timer1;
899 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
901 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
902 !timer->hw.resolution && timer->hw.c_resolution == NULL)
905 mutex_lock(®ister_mutex);
906 list_for_each_entry(timer1, &snd_timer_list, device_list) {
907 if (timer1->tmr_class > timer->tmr_class)
909 if (timer1->tmr_class < timer->tmr_class)
911 if (timer1->card && timer->card) {
912 if (timer1->card->number > timer->card->number)
914 if (timer1->card->number < timer->card->number)
917 if (timer1->tmr_device > timer->tmr_device)
919 if (timer1->tmr_device < timer->tmr_device)
921 if (timer1->tmr_subdevice > timer->tmr_subdevice)
923 if (timer1->tmr_subdevice < timer->tmr_subdevice)
926 mutex_unlock(®ister_mutex);
929 list_add_tail(&timer->device_list, &timer1->device_list);
930 mutex_unlock(®ister_mutex);
934 static int snd_timer_dev_disconnect(struct snd_device *device)
936 struct snd_timer *timer = device->device_data;
937 mutex_lock(®ister_mutex);
938 list_del_init(&timer->device_list);
939 mutex_unlock(®ister_mutex);
943 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
946 unsigned long resolution = 0;
947 struct snd_timer_instance *ti, *ts;
949 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
951 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
952 event > SNDRV_TIMER_EVENT_MRESUME))
954 spin_lock_irqsave(&timer->lock, flags);
955 if (event == SNDRV_TIMER_EVENT_MSTART ||
956 event == SNDRV_TIMER_EVENT_MCONTINUE ||
957 event == SNDRV_TIMER_EVENT_MRESUME) {
958 if (timer->hw.c_resolution)
959 resolution = timer->hw.c_resolution(timer);
961 resolution = timer->hw.resolution;
963 list_for_each_entry(ti, &timer->active_list_head, active_list) {
965 ti->ccallback(ti, event, tstamp, resolution);
966 list_for_each_entry(ts, &ti->slave_active_head, active_list)
968 ts->ccallback(ts, event, tstamp, resolution);
970 spin_unlock_irqrestore(&timer->lock, flags);
974 * exported functions for global timers
976 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
978 struct snd_timer_id tid;
980 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
981 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
985 return snd_timer_new(NULL, id, &tid, rtimer);
988 int snd_timer_global_free(struct snd_timer *timer)
990 return snd_timer_free(timer);
993 int snd_timer_global_register(struct snd_timer *timer)
995 struct snd_device dev;
997 memset(&dev, 0, sizeof(dev));
998 dev.device_data = timer;
999 return snd_timer_dev_register(&dev);
1006 struct snd_timer_system_private {
1007 struct timer_list tlist;
1008 unsigned long last_expires;
1009 unsigned long last_jiffies;
1010 unsigned long correction;
1013 static void snd_timer_s_function(unsigned long data)
1015 struct snd_timer *timer = (struct snd_timer *)data;
1016 struct snd_timer_system_private *priv = timer->private_data;
1017 unsigned long jiff = jiffies;
1018 if (time_after(jiff, priv->last_expires))
1019 priv->correction += (long)jiff - (long)priv->last_expires;
1020 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1023 static int snd_timer_s_start(struct snd_timer * timer)
1025 struct snd_timer_system_private *priv;
1026 unsigned long njiff;
1028 priv = (struct snd_timer_system_private *) timer->private_data;
1029 njiff = (priv->last_jiffies = jiffies);
1030 if (priv->correction > timer->sticks - 1) {
1031 priv->correction -= timer->sticks - 1;
1034 njiff += timer->sticks - priv->correction;
1035 priv->correction = 0;
1037 priv->last_expires = njiff;
1038 mod_timer(&priv->tlist, njiff);
1042 static int snd_timer_s_stop(struct snd_timer * timer)
1044 struct snd_timer_system_private *priv;
1047 priv = (struct snd_timer_system_private *) timer->private_data;
1048 del_timer(&priv->tlist);
1050 if (time_before(jiff, priv->last_expires))
1051 timer->sticks = priv->last_expires - jiff;
1054 priv->correction = 0;
1058 static struct snd_timer_hardware snd_timer_system =
1060 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1061 .resolution = 1000000000L / HZ,
1063 .start = snd_timer_s_start,
1064 .stop = snd_timer_s_stop
1067 static void snd_timer_free_system(struct snd_timer *timer)
1069 kfree(timer->private_data);
1072 static int snd_timer_register_system(void)
1074 struct snd_timer *timer;
1075 struct snd_timer_system_private *priv;
1078 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1081 strcpy(timer->name, "system timer");
1082 timer->hw = snd_timer_system;
1083 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1085 snd_timer_free(timer);
1088 init_timer(&priv->tlist);
1089 priv->tlist.function = snd_timer_s_function;
1090 priv->tlist.data = (unsigned long) timer;
1091 timer->private_data = priv;
1092 timer->private_free = snd_timer_free_system;
1093 return snd_timer_global_register(timer);
1096 #ifdef CONFIG_PROC_FS
1101 static void snd_timer_proc_read(struct snd_info_entry *entry,
1102 struct snd_info_buffer *buffer)
1104 struct snd_timer *timer;
1105 struct snd_timer_instance *ti;
1107 mutex_lock(®ister_mutex);
1108 list_for_each_entry(timer, &snd_timer_list, device_list) {
1109 switch (timer->tmr_class) {
1110 case SNDRV_TIMER_CLASS_GLOBAL:
1111 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1113 case SNDRV_TIMER_CLASS_CARD:
1114 snd_iprintf(buffer, "C%i-%i: ",
1115 timer->card->number, timer->tmr_device);
1117 case SNDRV_TIMER_CLASS_PCM:
1118 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1119 timer->tmr_device, timer->tmr_subdevice);
1122 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1123 timer->card ? timer->card->number : -1,
1124 timer->tmr_device, timer->tmr_subdevice);
1126 snd_iprintf(buffer, "%s :", timer->name);
1127 if (timer->hw.resolution)
1128 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1129 timer->hw.resolution / 1000,
1130 timer->hw.resolution % 1000,
1132 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1133 snd_iprintf(buffer, " SLAVE");
1134 snd_iprintf(buffer, "\n");
1135 list_for_each_entry(ti, &timer->open_list_head, open_list)
1136 snd_iprintf(buffer, " Client %s : %s\n",
1137 ti->owner ? ti->owner : "unknown",
1138 ti->flags & (SNDRV_TIMER_IFLG_START |
1139 SNDRV_TIMER_IFLG_RUNNING)
1140 ? "running" : "stopped");
1142 mutex_unlock(®ister_mutex);
1145 static struct snd_info_entry *snd_timer_proc_entry;
1147 static void __init snd_timer_proc_init(void)
1149 struct snd_info_entry *entry;
1151 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1152 if (entry != NULL) {
1153 entry->c.text.read = snd_timer_proc_read;
1154 if (snd_info_register(entry) < 0) {
1155 snd_info_free_entry(entry);
1159 snd_timer_proc_entry = entry;
1162 static void __exit snd_timer_proc_done(void)
1164 snd_info_free_entry(snd_timer_proc_entry);
1166 #else /* !CONFIG_PROC_FS */
1167 #define snd_timer_proc_init()
1168 #define snd_timer_proc_done()
1172 * USER SPACE interface
1175 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1176 unsigned long resolution,
1177 unsigned long ticks)
1179 struct snd_timer_user *tu = timeri->callback_data;
1180 struct snd_timer_read *r;
1183 spin_lock(&tu->qlock);
1184 if (tu->qused > 0) {
1185 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1186 r = &tu->queue[prev];
1187 if (r->resolution == resolution) {
1192 if (tu->qused >= tu->queue_size) {
1195 r = &tu->queue[tu->qtail++];
1196 tu->qtail %= tu->queue_size;
1197 r->resolution = resolution;
1202 spin_unlock(&tu->qlock);
1203 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1204 wake_up(&tu->qchange_sleep);
1207 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1208 struct snd_timer_tread *tread)
1210 if (tu->qused >= tu->queue_size) {
1213 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1214 tu->qtail %= tu->queue_size;
1219 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1221 struct timespec *tstamp,
1222 unsigned long resolution)
1224 struct snd_timer_user *tu = timeri->callback_data;
1225 struct snd_timer_tread r1;
1226 unsigned long flags;
1228 if (event >= SNDRV_TIMER_EVENT_START &&
1229 event <= SNDRV_TIMER_EVENT_PAUSE)
1230 tu->tstamp = *tstamp;
1231 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1233 memset(&r1, 0, sizeof(r1));
1235 r1.tstamp = *tstamp;
1236 r1.val = resolution;
1237 spin_lock_irqsave(&tu->qlock, flags);
1238 snd_timer_user_append_to_tqueue(tu, &r1);
1239 spin_unlock_irqrestore(&tu->qlock, flags);
1240 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1241 wake_up(&tu->qchange_sleep);
1244 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1245 unsigned long resolution,
1246 unsigned long ticks)
1248 struct snd_timer_user *tu = timeri->callback_data;
1249 struct snd_timer_tread *r, r1;
1250 struct timespec tstamp;
1251 int prev, append = 0;
1253 memset(&tstamp, 0, sizeof(tstamp));
1254 spin_lock(&tu->qlock);
1255 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1256 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1257 spin_unlock(&tu->qlock);
1260 if (tu->last_resolution != resolution || ticks > 0) {
1261 if (timer_tstamp_monotonic)
1262 do_posix_clock_monotonic_gettime(&tstamp);
1264 getnstimeofday(&tstamp);
1266 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1267 tu->last_resolution != resolution) {
1268 memset(&r1, 0, sizeof(r1));
1269 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1271 r1.val = resolution;
1272 snd_timer_user_append_to_tqueue(tu, &r1);
1273 tu->last_resolution = resolution;
1276 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1280 if (tu->qused > 0) {
1281 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1282 r = &tu->tqueue[prev];
1283 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1290 r1.event = SNDRV_TIMER_EVENT_TICK;
1293 snd_timer_user_append_to_tqueue(tu, &r1);
1296 spin_unlock(&tu->qlock);
1299 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1300 wake_up(&tu->qchange_sleep);
1303 static int snd_timer_user_open(struct inode *inode, struct file *file)
1305 struct snd_timer_user *tu;
1308 err = nonseekable_open(inode, file);
1312 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1315 spin_lock_init(&tu->qlock);
1316 init_waitqueue_head(&tu->qchange_sleep);
1317 mutex_init(&tu->ioctl_lock);
1319 tu->queue_size = 128;
1320 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1322 if (tu->queue == NULL) {
1326 file->private_data = tu;
1330 static int snd_timer_user_release(struct inode *inode, struct file *file)
1332 struct snd_timer_user *tu;
1334 if (file->private_data) {
1335 tu = file->private_data;
1336 file->private_data = NULL;
1337 mutex_lock(&tu->ioctl_lock);
1339 snd_timer_close(tu->timeri);
1340 mutex_unlock(&tu->ioctl_lock);
1348 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1350 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1351 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1357 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1359 id->dev_class = timer->tmr_class;
1360 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1361 id->card = timer->card ? timer->card->number : -1;
1362 id->device = timer->tmr_device;
1363 id->subdevice = timer->tmr_subdevice;
1366 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1368 struct snd_timer_id id;
1369 struct snd_timer *timer;
1370 struct list_head *p;
1372 if (copy_from_user(&id, _tid, sizeof(id)))
1374 mutex_lock(®ister_mutex);
1375 if (id.dev_class < 0) { /* first item */
1376 if (list_empty(&snd_timer_list))
1377 snd_timer_user_zero_id(&id);
1379 timer = list_entry(snd_timer_list.next,
1380 struct snd_timer, device_list);
1381 snd_timer_user_copy_id(&id, timer);
1384 switch (id.dev_class) {
1385 case SNDRV_TIMER_CLASS_GLOBAL:
1386 id.device = id.device < 0 ? 0 : id.device + 1;
1387 list_for_each(p, &snd_timer_list) {
1388 timer = list_entry(p, struct snd_timer, device_list);
1389 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1390 snd_timer_user_copy_id(&id, timer);
1393 if (timer->tmr_device >= id.device) {
1394 snd_timer_user_copy_id(&id, timer);
1398 if (p == &snd_timer_list)
1399 snd_timer_user_zero_id(&id);
1401 case SNDRV_TIMER_CLASS_CARD:
1402 case SNDRV_TIMER_CLASS_PCM:
1409 if (id.device < 0) {
1412 if (id.subdevice < 0) {
1420 list_for_each(p, &snd_timer_list) {
1421 timer = list_entry(p, struct snd_timer, device_list);
1422 if (timer->tmr_class > id.dev_class) {
1423 snd_timer_user_copy_id(&id, timer);
1426 if (timer->tmr_class < id.dev_class)
1428 if (timer->card->number > id.card) {
1429 snd_timer_user_copy_id(&id, timer);
1432 if (timer->card->number < id.card)
1434 if (timer->tmr_device > id.device) {
1435 snd_timer_user_copy_id(&id, timer);
1438 if (timer->tmr_device < id.device)
1440 if (timer->tmr_subdevice > id.subdevice) {
1441 snd_timer_user_copy_id(&id, timer);
1444 if (timer->tmr_subdevice < id.subdevice)
1446 snd_timer_user_copy_id(&id, timer);
1449 if (p == &snd_timer_list)
1450 snd_timer_user_zero_id(&id);
1453 snd_timer_user_zero_id(&id);
1456 mutex_unlock(®ister_mutex);
1457 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1462 static int snd_timer_user_ginfo(struct file *file,
1463 struct snd_timer_ginfo __user *_ginfo)
1465 struct snd_timer_ginfo *ginfo;
1466 struct snd_timer_id tid;
1467 struct snd_timer *t;
1468 struct list_head *p;
1471 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1473 return PTR_ERR(ginfo);
1476 memset(ginfo, 0, sizeof(*ginfo));
1478 mutex_lock(®ister_mutex);
1479 t = snd_timer_find(&tid);
1481 ginfo->card = t->card ? t->card->number : -1;
1482 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1483 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1484 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1485 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1486 ginfo->resolution = t->hw.resolution;
1487 if (t->hw.resolution_min > 0) {
1488 ginfo->resolution_min = t->hw.resolution_min;
1489 ginfo->resolution_max = t->hw.resolution_max;
1491 list_for_each(p, &t->open_list_head) {
1497 mutex_unlock(®ister_mutex);
1498 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1504 static int snd_timer_user_gparams(struct file *file,
1505 struct snd_timer_gparams __user *_gparams)
1507 struct snd_timer_gparams gparams;
1508 struct snd_timer *t;
1511 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1513 mutex_lock(®ister_mutex);
1514 t = snd_timer_find(&gparams.tid);
1519 if (!list_empty(&t->open_list_head)) {
1523 if (!t->hw.set_period) {
1527 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1529 mutex_unlock(®ister_mutex);
1533 static int snd_timer_user_gstatus(struct file *file,
1534 struct snd_timer_gstatus __user *_gstatus)
1536 struct snd_timer_gstatus gstatus;
1537 struct snd_timer_id tid;
1538 struct snd_timer *t;
1541 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1544 memset(&gstatus, 0, sizeof(gstatus));
1546 mutex_lock(®ister_mutex);
1547 t = snd_timer_find(&tid);
1549 if (t->hw.c_resolution)
1550 gstatus.resolution = t->hw.c_resolution(t);
1552 gstatus.resolution = t->hw.resolution;
1553 if (t->hw.precise_resolution) {
1554 t->hw.precise_resolution(t, &gstatus.resolution_num,
1555 &gstatus.resolution_den);
1557 gstatus.resolution_num = gstatus.resolution;
1558 gstatus.resolution_den = 1000000000uL;
1563 mutex_unlock(®ister_mutex);
1564 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1569 static int snd_timer_user_tselect(struct file *file,
1570 struct snd_timer_select __user *_tselect)
1572 struct snd_timer_user *tu;
1573 struct snd_timer_select tselect;
1577 tu = file->private_data;
1579 snd_timer_close(tu->timeri);
1582 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1586 sprintf(str, "application %i", current->pid);
1587 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1588 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1589 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1598 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1600 if (tu->tqueue == NULL)
1603 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1605 if (tu->queue == NULL)
1610 snd_timer_close(tu->timeri);
1613 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1614 tu->timeri->callback = tu->tread
1615 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1616 tu->timeri->ccallback = snd_timer_user_ccallback;
1617 tu->timeri->callback_data = (void *)tu;
1624 static int snd_timer_user_info(struct file *file,
1625 struct snd_timer_info __user *_info)
1627 struct snd_timer_user *tu;
1628 struct snd_timer_info *info;
1629 struct snd_timer *t;
1632 tu = file->private_data;
1635 t = tu->timeri->timer;
1639 info = kzalloc(sizeof(*info), GFP_KERNEL);
1642 info->card = t->card ? t->card->number : -1;
1643 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1644 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1645 strlcpy(info->id, t->id, sizeof(info->id));
1646 strlcpy(info->name, t->name, sizeof(info->name));
1647 info->resolution = t->hw.resolution;
1648 if (copy_to_user(_info, info, sizeof(*_info)))
1654 static int snd_timer_user_params(struct file *file,
1655 struct snd_timer_params __user *_params)
1657 struct snd_timer_user *tu;
1658 struct snd_timer_params params;
1659 struct snd_timer *t;
1660 struct snd_timer_read *tr;
1661 struct snd_timer_tread *ttr;
1664 tu = file->private_data;
1667 t = tu->timeri->timer;
1670 if (copy_from_user(¶ms, _params, sizeof(params)))
1672 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1675 if (params.ticks < 1) {
1680 /* Don't allow resolution less than 1ms */
1681 resolution = snd_timer_resolution(tu->timeri);
1682 resolution *= params.ticks;
1683 if (resolution < 1000000) {
1688 if (params.queue_size > 0 &&
1689 (params.queue_size < 32 || params.queue_size > 1024)) {
1693 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1694 (1<<SNDRV_TIMER_EVENT_TICK)|
1695 (1<<SNDRV_TIMER_EVENT_START)|
1696 (1<<SNDRV_TIMER_EVENT_STOP)|
1697 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1698 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1699 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1700 (1<<SNDRV_TIMER_EVENT_RESUME)|
1701 (1<<SNDRV_TIMER_EVENT_MSTART)|
1702 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1703 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1704 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1705 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1706 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1710 snd_timer_stop(tu->timeri);
1711 spin_lock_irq(&t->lock);
1712 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1713 SNDRV_TIMER_IFLG_EXCLUSIVE|
1714 SNDRV_TIMER_IFLG_EARLY_EVENT);
1715 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1716 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1717 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1718 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1719 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1720 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1721 spin_unlock_irq(&t->lock);
1722 if (params.queue_size > 0 &&
1723 (unsigned int)tu->queue_size != params.queue_size) {
1725 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1729 tu->queue_size = params.queue_size;
1733 tr = kmalloc(params.queue_size * sizeof(*tr),
1737 tu->queue_size = params.queue_size;
1742 tu->qhead = tu->qtail = tu->qused = 0;
1743 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1745 struct snd_timer_tread tread;
1746 memset(&tread, 0, sizeof(tread));
1747 tread.event = SNDRV_TIMER_EVENT_EARLY;
1748 tread.tstamp.tv_sec = 0;
1749 tread.tstamp.tv_nsec = 0;
1751 snd_timer_user_append_to_tqueue(tu, &tread);
1753 struct snd_timer_read *r = &tu->queue[0];
1760 tu->filter = params.filter;
1761 tu->ticks = params.ticks;
1764 if (copy_to_user(_params, ¶ms, sizeof(params)))
1769 static int snd_timer_user_status(struct file *file,
1770 struct snd_timer_status __user *_status)
1772 struct snd_timer_user *tu;
1773 struct snd_timer_status status;
1775 tu = file->private_data;
1778 memset(&status, 0, sizeof(status));
1779 status.tstamp = tu->tstamp;
1780 status.resolution = snd_timer_resolution(tu->timeri);
1781 status.lost = tu->timeri->lost;
1782 status.overrun = tu->overrun;
1783 spin_lock_irq(&tu->qlock);
1784 status.queue = tu->qused;
1785 spin_unlock_irq(&tu->qlock);
1786 if (copy_to_user(_status, &status, sizeof(status)))
1791 static int snd_timer_user_start(struct file *file)
1794 struct snd_timer_user *tu;
1796 tu = file->private_data;
1799 snd_timer_stop(tu->timeri);
1800 tu->timeri->lost = 0;
1801 tu->last_resolution = 0;
1802 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1805 static int snd_timer_user_stop(struct file *file)
1808 struct snd_timer_user *tu;
1810 tu = file->private_data;
1813 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1816 static int snd_timer_user_continue(struct file *file)
1819 struct snd_timer_user *tu;
1821 tu = file->private_data;
1824 /* start timer instead of continue if it's not used before */
1825 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1826 return snd_timer_user_start(file);
1827 tu->timeri->lost = 0;
1828 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1831 static int snd_timer_user_pause(struct file *file)
1834 struct snd_timer_user *tu;
1836 tu = file->private_data;
1839 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1843 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1844 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1845 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1846 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1849 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1852 struct snd_timer_user *tu;
1853 void __user *argp = (void __user *)arg;
1854 int __user *p = argp;
1856 tu = file->private_data;
1858 case SNDRV_TIMER_IOCTL_PVERSION:
1859 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1860 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1861 return snd_timer_user_next_device(argp);
1862 case SNDRV_TIMER_IOCTL_TREAD:
1866 if (tu->timeri) /* too late */
1868 if (get_user(xarg, p))
1870 tu->tread = xarg ? 1 : 0;
1873 case SNDRV_TIMER_IOCTL_GINFO:
1874 return snd_timer_user_ginfo(file, argp);
1875 case SNDRV_TIMER_IOCTL_GPARAMS:
1876 return snd_timer_user_gparams(file, argp);
1877 case SNDRV_TIMER_IOCTL_GSTATUS:
1878 return snd_timer_user_gstatus(file, argp);
1879 case SNDRV_TIMER_IOCTL_SELECT:
1880 return snd_timer_user_tselect(file, argp);
1881 case SNDRV_TIMER_IOCTL_INFO:
1882 return snd_timer_user_info(file, argp);
1883 case SNDRV_TIMER_IOCTL_PARAMS:
1884 return snd_timer_user_params(file, argp);
1885 case SNDRV_TIMER_IOCTL_STATUS:
1886 return snd_timer_user_status(file, argp);
1887 case SNDRV_TIMER_IOCTL_START:
1888 case SNDRV_TIMER_IOCTL_START_OLD:
1889 return snd_timer_user_start(file);
1890 case SNDRV_TIMER_IOCTL_STOP:
1891 case SNDRV_TIMER_IOCTL_STOP_OLD:
1892 return snd_timer_user_stop(file);
1893 case SNDRV_TIMER_IOCTL_CONTINUE:
1894 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1895 return snd_timer_user_continue(file);
1896 case SNDRV_TIMER_IOCTL_PAUSE:
1897 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1898 return snd_timer_user_pause(file);
1903 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1906 struct snd_timer_user *tu = file->private_data;
1909 mutex_lock(&tu->ioctl_lock);
1910 ret = __snd_timer_user_ioctl(file, cmd, arg);
1911 mutex_unlock(&tu->ioctl_lock);
1915 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1917 struct snd_timer_user *tu;
1919 tu = file->private_data;
1920 return fasync_helper(fd, file, on, &tu->fasync);
1923 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1924 size_t count, loff_t *offset)
1926 struct snd_timer_user *tu;
1927 long result = 0, unit;
1931 tu = file->private_data;
1932 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1933 mutex_lock(&tu->ioctl_lock);
1934 spin_lock_irq(&tu->qlock);
1935 while ((long)count - result >= unit) {
1936 while (!tu->qused) {
1939 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1944 set_current_state(TASK_INTERRUPTIBLE);
1945 init_waitqueue_entry(&wait, current);
1946 add_wait_queue(&tu->qchange_sleep, &wait);
1948 spin_unlock_irq(&tu->qlock);
1949 mutex_unlock(&tu->ioctl_lock);
1951 mutex_lock(&tu->ioctl_lock);
1952 spin_lock_irq(&tu->qlock);
1954 remove_wait_queue(&tu->qchange_sleep, &wait);
1956 if (signal_pending(current)) {
1962 qhead = tu->qhead++;
1963 tu->qhead %= tu->queue_size;
1965 spin_unlock_irq(&tu->qlock);
1968 if (copy_to_user(buffer, &tu->tqueue[qhead],
1969 sizeof(struct snd_timer_tread)))
1972 if (copy_to_user(buffer, &tu->queue[qhead],
1973 sizeof(struct snd_timer_read)))
1977 spin_lock_irq(&tu->qlock);
1984 spin_unlock_irq(&tu->qlock);
1985 mutex_unlock(&tu->ioctl_lock);
1986 return result > 0 ? result : err;
1989 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1992 struct snd_timer_user *tu;
1994 tu = file->private_data;
1996 poll_wait(file, &tu->qchange_sleep, wait);
2000 mask |= POLLIN | POLLRDNORM;
2005 #ifdef CONFIG_COMPAT
2006 #include "timer_compat.c"
2008 #define snd_timer_user_ioctl_compat NULL
2011 static const struct file_operations snd_timer_f_ops =
2013 .owner = THIS_MODULE,
2014 .read = snd_timer_user_read,
2015 .open = snd_timer_user_open,
2016 .release = snd_timer_user_release,
2017 .llseek = no_llseek,
2018 .poll = snd_timer_user_poll,
2019 .unlocked_ioctl = snd_timer_user_ioctl,
2020 .compat_ioctl = snd_timer_user_ioctl_compat,
2021 .fasync = snd_timer_user_fasync,
2028 static int __init alsa_timer_init(void)
2032 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2033 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2037 if ((err = snd_timer_register_system()) < 0)
2038 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
2040 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2041 &snd_timer_f_ops, NULL, "timer")) < 0)
2042 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
2044 snd_timer_proc_init();
2048 static void __exit alsa_timer_exit(void)
2050 struct list_head *p, *n;
2052 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
2053 /* unregister the system timer */
2054 list_for_each_safe(p, n, &snd_timer_list) {
2055 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
2056 snd_timer_free(timer);
2058 snd_timer_proc_done();
2059 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2060 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2064 module_init(alsa_timer_init)
2065 module_exit(alsa_timer_exit)
2067 EXPORT_SYMBOL(snd_timer_open);
2068 EXPORT_SYMBOL(snd_timer_close);
2069 EXPORT_SYMBOL(snd_timer_resolution);
2070 EXPORT_SYMBOL(snd_timer_start);
2071 EXPORT_SYMBOL(snd_timer_stop);
2072 EXPORT_SYMBOL(snd_timer_continue);
2073 EXPORT_SYMBOL(snd_timer_pause);
2074 EXPORT_SYMBOL(snd_timer_new);
2075 EXPORT_SYMBOL(snd_timer_notify);
2076 EXPORT_SYMBOL(snd_timer_global_new);
2077 EXPORT_SYMBOL(snd_timer_global_free);
2078 EXPORT_SYMBOL(snd_timer_global_register);
2079 EXPORT_SYMBOL(snd_timer_interrupt);