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 <sound/driver.h>
23 #include <linux/delay.h>
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/mutex.h>
28 #include <linux/moduleparam.h>
29 #include <linux/string.h>
30 #include <sound/core.h>
31 #include <sound/timer.h>
32 #include <sound/control.h>
33 #include <sound/info.h>
34 #include <sound/minors.h>
35 #include <sound/initval.h>
36 #include <linux/kmod.h>
38 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
39 #define DEFAULT_TIMER_LIMIT 3
40 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
41 #define DEFAULT_TIMER_LIMIT 2
43 #define DEFAULT_TIMER_LIMIT 1
46 static int timer_limit = DEFAULT_TIMER_LIMIT;
47 static int timer_tstamp_monotonic = 1;
48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
49 MODULE_DESCRIPTION("ALSA timer interface");
50 MODULE_LICENSE("GPL");
51 module_param(timer_limit, int, 0444);
52 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
53 module_param(timer_tstamp_monotonic, int, 0444);
54 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
56 struct snd_timer_user {
57 struct snd_timer_instance *timeri;
58 int tread; /* enhanced read with timestamps and events */
60 unsigned long overrun;
65 struct snd_timer_read *queue;
66 struct snd_timer_tread *tqueue;
68 unsigned long last_resolution;
70 struct timespec tstamp; /* trigger tstamp */
71 wait_queue_head_t qchange_sleep;
72 struct fasync_struct *fasync;
73 struct mutex tread_sem;
77 static LIST_HEAD(snd_timer_list);
79 /* list of slave instances */
80 static LIST_HEAD(snd_timer_slave_list);
82 /* lock for slave active lists */
83 static DEFINE_SPINLOCK(slave_active_lock);
85 static DEFINE_MUTEX(register_mutex);
87 static int snd_timer_free(struct snd_timer *timer);
88 static int snd_timer_dev_free(struct snd_device *device);
89 static int snd_timer_dev_register(struct snd_device *device);
90 static int snd_timer_dev_disconnect(struct snd_device *device);
92 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
95 * create a timer instance with the given owner string.
96 * when timer is not NULL, increments the module counter
98 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
99 struct snd_timer *timer)
101 struct snd_timer_instance *timeri;
102 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
105 timeri->owner = kstrdup(owner, GFP_KERNEL);
106 if (! timeri->owner) {
110 INIT_LIST_HEAD(&timeri->open_list);
111 INIT_LIST_HEAD(&timeri->active_list);
112 INIT_LIST_HEAD(&timeri->ack_list);
113 INIT_LIST_HEAD(&timeri->slave_list_head);
114 INIT_LIST_HEAD(&timeri->slave_active_head);
116 timeri->timer = timer;
117 if (timer && !try_module_get(timer->module)) {
118 kfree(timeri->owner);
127 * find a timer instance from the given timer id
129 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
131 struct snd_timer *timer = NULL;
133 list_for_each_entry(timer, &snd_timer_list, device_list) {
134 if (timer->tmr_class != tid->dev_class)
136 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
137 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
138 (timer->card == NULL ||
139 timer->card->number != tid->card))
141 if (timer->tmr_device != tid->device)
143 if (timer->tmr_subdevice != tid->subdevice)
152 static void snd_timer_request(struct snd_timer_id *tid)
154 if (! current->fs->root)
156 switch (tid->dev_class) {
157 case SNDRV_TIMER_CLASS_GLOBAL:
158 if (tid->device < timer_limit)
159 request_module("snd-timer-%i", tid->device);
161 case SNDRV_TIMER_CLASS_CARD:
162 case SNDRV_TIMER_CLASS_PCM:
163 if (tid->card < snd_ecards_limit)
164 request_module("snd-card-%i", tid->card);
174 * look for a master instance matching with the slave id of the given slave.
175 * when found, relink the open_link of the slave.
177 * call this with register_mutex down.
179 static void snd_timer_check_slave(struct snd_timer_instance *slave)
181 struct snd_timer *timer;
182 struct snd_timer_instance *master;
184 /* FIXME: it's really dumb to look up all entries.. */
185 list_for_each_entry(timer, &snd_timer_list, device_list) {
186 list_for_each_entry(master, &timer->open_list_head, open_list) {
187 if (slave->slave_class == master->slave_class &&
188 slave->slave_id == master->slave_id) {
189 list_del(&slave->open_list);
190 list_add_tail(&slave->open_list,
191 &master->slave_list_head);
192 spin_lock_irq(&slave_active_lock);
193 slave->master = master;
194 slave->timer = master->timer;
195 spin_unlock_irq(&slave_active_lock);
203 * look for slave instances matching with the slave id of the given master.
204 * when found, relink the open_link of slaves.
206 * call this with register_mutex down.
208 static void snd_timer_check_master(struct snd_timer_instance *master)
210 struct snd_timer_instance *slave, *tmp;
212 /* check all pending slaves */
213 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
214 if (slave->slave_class == master->slave_class &&
215 slave->slave_id == master->slave_id) {
216 list_move_tail(&slave->open_list, &master->slave_list_head);
217 spin_lock_irq(&slave_active_lock);
218 slave->master = master;
219 slave->timer = master->timer;
220 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
221 list_add_tail(&slave->active_list,
222 &master->slave_active_head);
223 spin_unlock_irq(&slave_active_lock);
229 * open a timer instance
230 * when opening a master, the slave id must be here given.
232 int snd_timer_open(struct snd_timer_instance **ti,
233 char *owner, struct snd_timer_id *tid,
234 unsigned int slave_id)
236 struct snd_timer *timer;
237 struct snd_timer_instance *timeri = NULL;
239 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
240 /* open a slave instance */
241 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
242 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
243 snd_printd("invalid slave class %i\n", tid->dev_sclass);
246 mutex_lock(®ister_mutex);
247 timeri = snd_timer_instance_new(owner, NULL);
249 mutex_unlock(®ister_mutex);
252 timeri->slave_class = tid->dev_sclass;
253 timeri->slave_id = tid->device;
254 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
255 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
256 snd_timer_check_slave(timeri);
257 mutex_unlock(®ister_mutex);
262 /* open a master instance */
263 mutex_lock(®ister_mutex);
264 timer = snd_timer_find(tid);
267 mutex_unlock(®ister_mutex);
268 snd_timer_request(tid);
269 mutex_lock(®ister_mutex);
270 timer = snd_timer_find(tid);
274 mutex_unlock(®ister_mutex);
277 if (!list_empty(&timer->open_list_head)) {
278 timeri = list_entry(timer->open_list_head.next,
279 struct snd_timer_instance, open_list);
280 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
281 mutex_unlock(®ister_mutex);
285 timeri = snd_timer_instance_new(owner, timer);
287 mutex_unlock(®ister_mutex);
290 timeri->slave_class = tid->dev_sclass;
291 timeri->slave_id = slave_id;
292 if (list_empty(&timer->open_list_head) && timer->hw.open)
293 timer->hw.open(timer);
294 list_add_tail(&timeri->open_list, &timer->open_list_head);
295 snd_timer_check_master(timeri);
296 mutex_unlock(®ister_mutex);
301 static int _snd_timer_stop(struct snd_timer_instance *timeri,
302 int keep_flag, int event);
305 * close a timer instance
307 int snd_timer_close(struct snd_timer_instance *timeri)
309 struct snd_timer *timer = NULL;
310 struct snd_timer_instance *slave, *tmp;
312 snd_assert(timeri != NULL, return -ENXIO);
314 /* force to stop the timer */
315 snd_timer_stop(timeri);
317 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
318 /* wait, until the active callback is finished */
319 spin_lock_irq(&slave_active_lock);
320 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
321 spin_unlock_irq(&slave_active_lock);
323 spin_lock_irq(&slave_active_lock);
325 spin_unlock_irq(&slave_active_lock);
326 mutex_lock(®ister_mutex);
327 list_del(&timeri->open_list);
328 mutex_unlock(®ister_mutex);
330 timer = timeri->timer;
331 /* wait, until the active callback is finished */
332 spin_lock_irq(&timer->lock);
333 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
334 spin_unlock_irq(&timer->lock);
336 spin_lock_irq(&timer->lock);
338 spin_unlock_irq(&timer->lock);
339 mutex_lock(®ister_mutex);
340 list_del(&timeri->open_list);
341 if (timer && list_empty(&timer->open_list_head) &&
343 timer->hw.close(timer);
344 /* remove slave links */
345 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
347 spin_lock_irq(&slave_active_lock);
348 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
349 list_move_tail(&slave->open_list, &snd_timer_slave_list);
350 slave->master = NULL;
352 spin_unlock_irq(&slave_active_lock);
354 mutex_unlock(®ister_mutex);
356 if (timeri->private_free)
357 timeri->private_free(timeri);
358 kfree(timeri->owner);
361 module_put(timer->module);
365 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
367 struct snd_timer * timer;
371 if ((timer = timeri->timer) != NULL) {
372 if (timer->hw.c_resolution)
373 return timer->hw.c_resolution(timer);
374 return timer->hw.resolution;
379 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
381 struct snd_timer *timer;
383 unsigned long resolution = 0;
384 struct snd_timer_instance *ts;
385 struct timespec tstamp;
387 if (timer_tstamp_monotonic)
388 do_posix_clock_monotonic_gettime(&tstamp);
390 getnstimeofday(&tstamp);
391 snd_assert(event >= SNDRV_TIMER_EVENT_START &&
392 event <= SNDRV_TIMER_EVENT_PAUSE, return);
393 if (event == SNDRV_TIMER_EVENT_START ||
394 event == SNDRV_TIMER_EVENT_CONTINUE)
395 resolution = snd_timer_resolution(ti);
397 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
398 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
403 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
405 spin_lock_irqsave(&timer->lock, flags);
406 list_for_each_entry(ts, &ti->slave_active_head, active_list)
408 ts->ccallback(ti, event + 100, &tstamp, resolution);
409 spin_unlock_irqrestore(&timer->lock, flags);
412 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
413 unsigned long sticks)
415 list_del(&timeri->active_list);
416 list_add_tail(&timeri->active_list, &timer->active_list_head);
417 if (timer->running) {
418 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
420 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
421 timeri->flags |= SNDRV_TIMER_IFLG_START;
422 return 1; /* delayed start */
424 timer->sticks = sticks;
425 timer->hw.start(timer);
428 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
433 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
437 spin_lock_irqsave(&slave_active_lock, flags);
438 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
440 list_add_tail(&timeri->active_list,
441 &timeri->master->slave_active_head);
442 spin_unlock_irqrestore(&slave_active_lock, flags);
443 return 1; /* delayed start */
447 * start the timer instance
449 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
451 struct snd_timer *timer;
452 int result = -EINVAL;
455 if (timeri == NULL || ticks < 1)
457 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
458 result = snd_timer_start_slave(timeri);
459 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
462 timer = timeri->timer;
465 spin_lock_irqsave(&timer->lock, flags);
466 timeri->ticks = timeri->cticks = ticks;
468 result = snd_timer_start1(timer, timeri, ticks);
469 spin_unlock_irqrestore(&timer->lock, flags);
470 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
474 static int _snd_timer_stop(struct snd_timer_instance * timeri,
475 int keep_flag, int event)
477 struct snd_timer *timer;
480 snd_assert(timeri != NULL, return -ENXIO);
482 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
484 spin_lock_irqsave(&slave_active_lock, flags);
485 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
486 spin_unlock_irqrestore(&slave_active_lock, flags);
490 timer = timeri->timer;
493 spin_lock_irqsave(&timer->lock, flags);
494 list_del_init(&timeri->ack_list);
495 list_del_init(&timeri->active_list);
496 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
497 !(--timer->running)) {
498 timer->hw.stop(timer);
499 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
500 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
501 snd_timer_reschedule(timer, 0);
502 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
503 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
504 timer->hw.start(timer);
510 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
511 spin_unlock_irqrestore(&timer->lock, flags);
513 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
514 snd_timer_notify1(timeri, event);
519 * stop the timer instance.
521 * do not call this from the timer callback!
523 int snd_timer_stop(struct snd_timer_instance *timeri)
525 struct snd_timer *timer;
529 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
532 timer = timeri->timer;
533 spin_lock_irqsave(&timer->lock, flags);
534 timeri->cticks = timeri->ticks;
536 spin_unlock_irqrestore(&timer->lock, flags);
541 * start again.. the tick is kept.
543 int snd_timer_continue(struct snd_timer_instance *timeri)
545 struct snd_timer *timer;
546 int result = -EINVAL;
551 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
552 return snd_timer_start_slave(timeri);
553 timer = timeri->timer;
556 spin_lock_irqsave(&timer->lock, flags);
560 result = snd_timer_start1(timer, timeri, timer->sticks);
561 spin_unlock_irqrestore(&timer->lock, flags);
562 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
567 * pause.. remember the ticks left
569 int snd_timer_pause(struct snd_timer_instance * timeri)
571 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
575 * reschedule the timer
577 * start pending instances and check the scheduling ticks.
578 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
580 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
582 struct snd_timer_instance *ti;
583 unsigned long ticks = ~0UL;
585 list_for_each_entry(ti, &timer->active_list_head, active_list) {
586 if (ti->flags & SNDRV_TIMER_IFLG_START) {
587 ti->flags &= ~SNDRV_TIMER_IFLG_START;
588 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
591 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
592 if (ticks > ti->cticks)
597 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
600 if (ticks > timer->hw.ticks)
601 ticks = timer->hw.ticks;
602 if (ticks_left != ticks)
603 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
604 timer->sticks = ticks;
611 static void snd_timer_tasklet(unsigned long arg)
613 struct snd_timer *timer = (struct snd_timer *) arg;
614 struct snd_timer_instance *ti;
616 unsigned long resolution, ticks;
619 spin_lock_irqsave(&timer->lock, flags);
620 /* now process all callbacks */
621 while (!list_empty(&timer->sack_list_head)) {
622 p = timer->sack_list_head.next; /* get first item */
623 ti = list_entry(p, struct snd_timer_instance, ack_list);
625 /* remove from ack_list and make empty */
630 resolution = ti->resolution;
632 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
633 spin_unlock(&timer->lock);
635 ti->callback(ti, resolution, ticks);
636 spin_lock(&timer->lock);
637 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
639 spin_unlock_irqrestore(&timer->lock, flags);
645 * ticks_left is usually equal to timer->sticks.
648 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
650 struct snd_timer_instance *ti, *ts, *tmp;
651 unsigned long resolution, ticks;
652 struct list_head *p, *ack_list_head;
659 spin_lock_irqsave(&timer->lock, flags);
661 /* remember the current resolution */
662 if (timer->hw.c_resolution)
663 resolution = timer->hw.c_resolution(timer);
665 resolution = timer->hw.resolution;
667 /* loop for all active instances
668 * Here we cannot use list_for_each_entry because the active_list of a
669 * processed instance is relinked to done_list_head before the callback
672 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
674 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
676 ti->pticks += ticks_left;
677 ti->resolution = resolution;
678 if (ti->cticks < ticks_left)
681 ti->cticks -= ticks_left;
682 if (ti->cticks) /* not expired */
684 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
685 ti->cticks = ti->ticks;
687 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
688 if (--timer->running)
689 list_del(&ti->active_list);
691 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
692 (ti->flags & SNDRV_TIMER_IFLG_FAST))
693 ack_list_head = &timer->ack_list_head;
695 ack_list_head = &timer->sack_list_head;
696 if (list_empty(&ti->ack_list))
697 list_add_tail(&ti->ack_list, ack_list_head);
698 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
699 ts->pticks = ti->pticks;
700 ts->resolution = resolution;
701 if (list_empty(&ts->ack_list))
702 list_add_tail(&ts->ack_list, ack_list_head);
705 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
706 snd_timer_reschedule(timer, timer->sticks);
707 if (timer->running) {
708 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
709 timer->hw.stop(timer);
710 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
712 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
713 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
715 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
716 timer->hw.start(timer);
719 timer->hw.stop(timer);
722 /* now process all fast callbacks */
723 while (!list_empty(&timer->ack_list_head)) {
724 p = timer->ack_list_head.next; /* get first item */
725 ti = list_entry(p, struct snd_timer_instance, ack_list);
727 /* remove from ack_list and make empty */
733 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
734 spin_unlock(&timer->lock);
736 ti->callback(ti, resolution, ticks);
737 spin_lock(&timer->lock);
738 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
741 /* do we have any slow callbacks? */
742 use_tasklet = !list_empty(&timer->sack_list_head);
743 spin_unlock_irqrestore(&timer->lock, flags);
746 tasklet_hi_schedule(&timer->task_queue);
753 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
754 struct snd_timer **rtimer)
756 struct snd_timer *timer;
758 static struct snd_device_ops ops = {
759 .dev_free = snd_timer_dev_free,
760 .dev_register = snd_timer_dev_register,
761 .dev_disconnect = snd_timer_dev_disconnect,
764 snd_assert(tid != NULL, return -EINVAL);
765 snd_assert(rtimer != NULL, return -EINVAL);
767 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
769 snd_printk(KERN_ERR "timer: cannot allocate\n");
772 timer->tmr_class = tid->dev_class;
774 timer->tmr_device = tid->device;
775 timer->tmr_subdevice = tid->subdevice;
777 strlcpy(timer->id, id, sizeof(timer->id));
778 INIT_LIST_HEAD(&timer->device_list);
779 INIT_LIST_HEAD(&timer->open_list_head);
780 INIT_LIST_HEAD(&timer->active_list_head);
781 INIT_LIST_HEAD(&timer->ack_list_head);
782 INIT_LIST_HEAD(&timer->sack_list_head);
783 spin_lock_init(&timer->lock);
784 tasklet_init(&timer->task_queue, snd_timer_tasklet,
785 (unsigned long)timer);
787 timer->module = card->module;
788 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
790 snd_timer_free(timer);
798 static int snd_timer_free(struct snd_timer *timer)
800 snd_assert(timer != NULL, return -ENXIO);
802 mutex_lock(®ister_mutex);
803 if (! list_empty(&timer->open_list_head)) {
804 struct list_head *p, *n;
805 struct snd_timer_instance *ti;
806 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
807 list_for_each_safe(p, n, &timer->open_list_head) {
809 ti = list_entry(p, struct snd_timer_instance, open_list);
813 list_del(&timer->device_list);
814 mutex_unlock(®ister_mutex);
816 if (timer->private_free)
817 timer->private_free(timer);
822 static int snd_timer_dev_free(struct snd_device *device)
824 struct snd_timer *timer = device->device_data;
825 return snd_timer_free(timer);
828 static int snd_timer_dev_register(struct snd_device *dev)
830 struct snd_timer *timer = dev->device_data;
831 struct snd_timer *timer1;
833 snd_assert(timer != NULL && timer->hw.start != NULL &&
834 timer->hw.stop != NULL, return -ENXIO);
835 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
836 !timer->hw.resolution && timer->hw.c_resolution == NULL)
839 mutex_lock(®ister_mutex);
840 list_for_each_entry(timer1, &snd_timer_list, device_list) {
841 if (timer1->tmr_class > timer->tmr_class)
843 if (timer1->tmr_class < timer->tmr_class)
845 if (timer1->card && timer->card) {
846 if (timer1->card->number > timer->card->number)
848 if (timer1->card->number < timer->card->number)
851 if (timer1->tmr_device > timer->tmr_device)
853 if (timer1->tmr_device < timer->tmr_device)
855 if (timer1->tmr_subdevice > timer->tmr_subdevice)
857 if (timer1->tmr_subdevice < timer->tmr_subdevice)
860 mutex_unlock(®ister_mutex);
863 list_add_tail(&timer->device_list, &timer1->device_list);
864 mutex_unlock(®ister_mutex);
868 static int snd_timer_dev_disconnect(struct snd_device *device)
870 struct snd_timer *timer = device->device_data;
871 mutex_lock(®ister_mutex);
872 list_del_init(&timer->device_list);
873 mutex_unlock(®ister_mutex);
877 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
880 unsigned long resolution = 0;
881 struct snd_timer_instance *ti, *ts;
883 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
885 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART &&
886 event <= SNDRV_TIMER_EVENT_MRESUME, return);
887 spin_lock_irqsave(&timer->lock, flags);
888 if (event == SNDRV_TIMER_EVENT_MSTART ||
889 event == SNDRV_TIMER_EVENT_MCONTINUE ||
890 event == SNDRV_TIMER_EVENT_MRESUME) {
891 if (timer->hw.c_resolution)
892 resolution = timer->hw.c_resolution(timer);
894 resolution = timer->hw.resolution;
896 list_for_each_entry(ti, &timer->active_list_head, active_list) {
898 ti->ccallback(ti, event, tstamp, resolution);
899 list_for_each_entry(ts, &ti->slave_active_head, active_list)
901 ts->ccallback(ts, event, tstamp, resolution);
903 spin_unlock_irqrestore(&timer->lock, flags);
907 * exported functions for global timers
909 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
911 struct snd_timer_id tid;
913 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
914 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
918 return snd_timer_new(NULL, id, &tid, rtimer);
921 int snd_timer_global_free(struct snd_timer *timer)
923 return snd_timer_free(timer);
926 int snd_timer_global_register(struct snd_timer *timer)
928 struct snd_device dev;
930 memset(&dev, 0, sizeof(dev));
931 dev.device_data = timer;
932 return snd_timer_dev_register(&dev);
939 struct snd_timer_system_private {
940 struct timer_list tlist;
941 unsigned long last_expires;
942 unsigned long last_jiffies;
943 unsigned long correction;
946 static void snd_timer_s_function(unsigned long data)
948 struct snd_timer *timer = (struct snd_timer *)data;
949 struct snd_timer_system_private *priv = timer->private_data;
950 unsigned long jiff = jiffies;
951 if (time_after(jiff, priv->last_expires))
952 priv->correction += (long)jiff - (long)priv->last_expires;
953 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
956 static int snd_timer_s_start(struct snd_timer * timer)
958 struct snd_timer_system_private *priv;
961 priv = (struct snd_timer_system_private *) timer->private_data;
962 njiff = (priv->last_jiffies = jiffies);
963 if (priv->correction > timer->sticks - 1) {
964 priv->correction -= timer->sticks - 1;
967 njiff += timer->sticks - priv->correction;
968 priv->correction = 0;
970 priv->last_expires = priv->tlist.expires = njiff;
971 add_timer(&priv->tlist);
975 static int snd_timer_s_stop(struct snd_timer * timer)
977 struct snd_timer_system_private *priv;
980 priv = (struct snd_timer_system_private *) timer->private_data;
981 del_timer(&priv->tlist);
983 if (time_before(jiff, priv->last_expires))
984 timer->sticks = priv->last_expires - jiff;
987 priv->correction = 0;
991 static struct snd_timer_hardware snd_timer_system =
993 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
994 .resolution = 1000000000L / HZ,
996 .start = snd_timer_s_start,
997 .stop = snd_timer_s_stop
1000 static void snd_timer_free_system(struct snd_timer *timer)
1002 kfree(timer->private_data);
1005 static int snd_timer_register_system(void)
1007 struct snd_timer *timer;
1008 struct snd_timer_system_private *priv;
1011 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1014 strcpy(timer->name, "system timer");
1015 timer->hw = snd_timer_system;
1016 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1018 snd_timer_free(timer);
1021 init_timer(&priv->tlist);
1022 priv->tlist.function = snd_timer_s_function;
1023 priv->tlist.data = (unsigned long) timer;
1024 timer->private_data = priv;
1025 timer->private_free = snd_timer_free_system;
1026 return snd_timer_global_register(timer);
1029 #ifdef CONFIG_PROC_FS
1034 static void snd_timer_proc_read(struct snd_info_entry *entry,
1035 struct snd_info_buffer *buffer)
1037 struct snd_timer *timer;
1038 struct snd_timer_instance *ti;
1040 mutex_lock(®ister_mutex);
1041 list_for_each_entry(timer, &snd_timer_list, device_list) {
1042 switch (timer->tmr_class) {
1043 case SNDRV_TIMER_CLASS_GLOBAL:
1044 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1046 case SNDRV_TIMER_CLASS_CARD:
1047 snd_iprintf(buffer, "C%i-%i: ",
1048 timer->card->number, timer->tmr_device);
1050 case SNDRV_TIMER_CLASS_PCM:
1051 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1052 timer->tmr_device, timer->tmr_subdevice);
1055 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1056 timer->card ? timer->card->number : -1,
1057 timer->tmr_device, timer->tmr_subdevice);
1059 snd_iprintf(buffer, "%s :", timer->name);
1060 if (timer->hw.resolution)
1061 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1062 timer->hw.resolution / 1000,
1063 timer->hw.resolution % 1000,
1065 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1066 snd_iprintf(buffer, " SLAVE");
1067 snd_iprintf(buffer, "\n");
1068 list_for_each_entry(ti, &timer->open_list_head, open_list)
1069 snd_iprintf(buffer, " Client %s : %s\n",
1070 ti->owner ? ti->owner : "unknown",
1071 ti->flags & (SNDRV_TIMER_IFLG_START |
1072 SNDRV_TIMER_IFLG_RUNNING)
1073 ? "running" : "stopped");
1075 mutex_unlock(®ister_mutex);
1078 static struct snd_info_entry *snd_timer_proc_entry;
1080 static void __init snd_timer_proc_init(void)
1082 struct snd_info_entry *entry;
1084 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1085 if (entry != NULL) {
1086 entry->c.text.read = snd_timer_proc_read;
1087 if (snd_info_register(entry) < 0) {
1088 snd_info_free_entry(entry);
1092 snd_timer_proc_entry = entry;
1095 static void __exit snd_timer_proc_done(void)
1097 snd_info_free_entry(snd_timer_proc_entry);
1099 #else /* !CONFIG_PROC_FS */
1100 #define snd_timer_proc_init()
1101 #define snd_timer_proc_done()
1105 * USER SPACE interface
1108 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1109 unsigned long resolution,
1110 unsigned long ticks)
1112 struct snd_timer_user *tu = timeri->callback_data;
1113 struct snd_timer_read *r;
1116 spin_lock(&tu->qlock);
1117 if (tu->qused > 0) {
1118 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1119 r = &tu->queue[prev];
1120 if (r->resolution == resolution) {
1125 if (tu->qused >= tu->queue_size) {
1128 r = &tu->queue[tu->qtail++];
1129 tu->qtail %= tu->queue_size;
1130 r->resolution = resolution;
1135 spin_unlock(&tu->qlock);
1136 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1137 wake_up(&tu->qchange_sleep);
1140 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1141 struct snd_timer_tread *tread)
1143 if (tu->qused >= tu->queue_size) {
1146 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1147 tu->qtail %= tu->queue_size;
1152 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1154 struct timespec *tstamp,
1155 unsigned long resolution)
1157 struct snd_timer_user *tu = timeri->callback_data;
1158 struct snd_timer_tread r1;
1160 if (event >= SNDRV_TIMER_EVENT_START &&
1161 event <= SNDRV_TIMER_EVENT_PAUSE)
1162 tu->tstamp = *tstamp;
1163 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1166 r1.tstamp = *tstamp;
1167 r1.val = resolution;
1168 spin_lock(&tu->qlock);
1169 snd_timer_user_append_to_tqueue(tu, &r1);
1170 spin_unlock(&tu->qlock);
1171 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1172 wake_up(&tu->qchange_sleep);
1175 static void snd_timer_user_tinterrupt(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_tread *r, r1;
1181 struct timespec tstamp;
1182 int prev, append = 0;
1184 memset(&tstamp, 0, sizeof(tstamp));
1185 spin_lock(&tu->qlock);
1186 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1187 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1188 spin_unlock(&tu->qlock);
1191 if (tu->last_resolution != resolution || ticks > 0) {
1192 if (timer_tstamp_monotonic)
1193 do_posix_clock_monotonic_gettime(&tstamp);
1195 getnstimeofday(&tstamp);
1197 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1198 tu->last_resolution != resolution) {
1199 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1201 r1.val = resolution;
1202 snd_timer_user_append_to_tqueue(tu, &r1);
1203 tu->last_resolution = resolution;
1206 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1210 if (tu->qused > 0) {
1211 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1212 r = &tu->tqueue[prev];
1213 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1220 r1.event = SNDRV_TIMER_EVENT_TICK;
1223 snd_timer_user_append_to_tqueue(tu, &r1);
1226 spin_unlock(&tu->qlock);
1229 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1230 wake_up(&tu->qchange_sleep);
1233 static int snd_timer_user_open(struct inode *inode, struct file *file)
1235 struct snd_timer_user *tu;
1237 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1240 spin_lock_init(&tu->qlock);
1241 init_waitqueue_head(&tu->qchange_sleep);
1242 mutex_init(&tu->tread_sem);
1244 tu->queue_size = 128;
1245 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1247 if (tu->queue == NULL) {
1251 file->private_data = tu;
1255 static int snd_timer_user_release(struct inode *inode, struct file *file)
1257 struct snd_timer_user *tu;
1259 if (file->private_data) {
1260 tu = file->private_data;
1261 file->private_data = NULL;
1262 fasync_helper(-1, file, 0, &tu->fasync);
1264 snd_timer_close(tu->timeri);
1272 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1274 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1275 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1281 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1283 id->dev_class = timer->tmr_class;
1284 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1285 id->card = timer->card ? timer->card->number : -1;
1286 id->device = timer->tmr_device;
1287 id->subdevice = timer->tmr_subdevice;
1290 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1292 struct snd_timer_id id;
1293 struct snd_timer *timer;
1294 struct list_head *p;
1296 if (copy_from_user(&id, _tid, sizeof(id)))
1298 mutex_lock(®ister_mutex);
1299 if (id.dev_class < 0) { /* first item */
1300 if (list_empty(&snd_timer_list))
1301 snd_timer_user_zero_id(&id);
1303 timer = list_entry(snd_timer_list.next,
1304 struct snd_timer, device_list);
1305 snd_timer_user_copy_id(&id, timer);
1308 switch (id.dev_class) {
1309 case SNDRV_TIMER_CLASS_GLOBAL:
1310 id.device = id.device < 0 ? 0 : id.device + 1;
1311 list_for_each(p, &snd_timer_list) {
1312 timer = list_entry(p, struct snd_timer, device_list);
1313 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1314 snd_timer_user_copy_id(&id, timer);
1317 if (timer->tmr_device >= id.device) {
1318 snd_timer_user_copy_id(&id, timer);
1322 if (p == &snd_timer_list)
1323 snd_timer_user_zero_id(&id);
1325 case SNDRV_TIMER_CLASS_CARD:
1326 case SNDRV_TIMER_CLASS_PCM:
1333 if (id.device < 0) {
1336 if (id.subdevice < 0) {
1344 list_for_each(p, &snd_timer_list) {
1345 timer = list_entry(p, struct snd_timer, device_list);
1346 if (timer->tmr_class > id.dev_class) {
1347 snd_timer_user_copy_id(&id, timer);
1350 if (timer->tmr_class < id.dev_class)
1352 if (timer->card->number > id.card) {
1353 snd_timer_user_copy_id(&id, timer);
1356 if (timer->card->number < id.card)
1358 if (timer->tmr_device > id.device) {
1359 snd_timer_user_copy_id(&id, timer);
1362 if (timer->tmr_device < id.device)
1364 if (timer->tmr_subdevice > id.subdevice) {
1365 snd_timer_user_copy_id(&id, timer);
1368 if (timer->tmr_subdevice < id.subdevice)
1370 snd_timer_user_copy_id(&id, timer);
1373 if (p == &snd_timer_list)
1374 snd_timer_user_zero_id(&id);
1377 snd_timer_user_zero_id(&id);
1380 mutex_unlock(®ister_mutex);
1381 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1386 static int snd_timer_user_ginfo(struct file *file,
1387 struct snd_timer_ginfo __user *_ginfo)
1389 struct snd_timer_ginfo *ginfo;
1390 struct snd_timer_id tid;
1391 struct snd_timer *t;
1392 struct list_head *p;
1395 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1398 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1403 memset(ginfo, 0, sizeof(*ginfo));
1405 mutex_lock(®ister_mutex);
1406 t = snd_timer_find(&tid);
1408 ginfo->card = t->card ? t->card->number : -1;
1409 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1410 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1411 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1412 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1413 ginfo->resolution = t->hw.resolution;
1414 if (t->hw.resolution_min > 0) {
1415 ginfo->resolution_min = t->hw.resolution_min;
1416 ginfo->resolution_max = t->hw.resolution_max;
1418 list_for_each(p, &t->open_list_head) {
1424 mutex_unlock(®ister_mutex);
1425 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1431 static int snd_timer_user_gparams(struct file *file,
1432 struct snd_timer_gparams __user *_gparams)
1434 struct snd_timer_gparams gparams;
1435 struct snd_timer *t;
1438 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1440 mutex_lock(®ister_mutex);
1441 t = snd_timer_find(&gparams.tid);
1446 if (!list_empty(&t->open_list_head)) {
1450 if (!t->hw.set_period) {
1454 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1456 mutex_unlock(®ister_mutex);
1460 static int snd_timer_user_gstatus(struct file *file,
1461 struct snd_timer_gstatus __user *_gstatus)
1463 struct snd_timer_gstatus gstatus;
1464 struct snd_timer_id tid;
1465 struct snd_timer *t;
1468 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1471 memset(&gstatus, 0, sizeof(gstatus));
1473 mutex_lock(®ister_mutex);
1474 t = snd_timer_find(&tid);
1476 if (t->hw.c_resolution)
1477 gstatus.resolution = t->hw.c_resolution(t);
1479 gstatus.resolution = t->hw.resolution;
1480 if (t->hw.precise_resolution) {
1481 t->hw.precise_resolution(t, &gstatus.resolution_num,
1482 &gstatus.resolution_den);
1484 gstatus.resolution_num = gstatus.resolution;
1485 gstatus.resolution_den = 1000000000uL;
1490 mutex_unlock(®ister_mutex);
1491 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1496 static int snd_timer_user_tselect(struct file *file,
1497 struct snd_timer_select __user *_tselect)
1499 struct snd_timer_user *tu;
1500 struct snd_timer_select tselect;
1504 tu = file->private_data;
1505 mutex_lock(&tu->tread_sem);
1507 snd_timer_close(tu->timeri);
1510 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1514 sprintf(str, "application %i", current->pid);
1515 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1516 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1517 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1526 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1528 if (tu->tqueue == NULL)
1531 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1533 if (tu->queue == NULL)
1538 snd_timer_close(tu->timeri);
1541 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1542 tu->timeri->callback = tu->tread
1543 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1544 tu->timeri->ccallback = snd_timer_user_ccallback;
1545 tu->timeri->callback_data = (void *)tu;
1549 mutex_unlock(&tu->tread_sem);
1553 static int snd_timer_user_info(struct file *file,
1554 struct snd_timer_info __user *_info)
1556 struct snd_timer_user *tu;
1557 struct snd_timer_info *info;
1558 struct snd_timer *t;
1561 tu = file->private_data;
1564 t = tu->timeri->timer;
1568 info = kzalloc(sizeof(*info), GFP_KERNEL);
1571 info->card = t->card ? t->card->number : -1;
1572 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1573 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1574 strlcpy(info->id, t->id, sizeof(info->id));
1575 strlcpy(info->name, t->name, sizeof(info->name));
1576 info->resolution = t->hw.resolution;
1577 if (copy_to_user(_info, info, sizeof(*_info)))
1583 static int snd_timer_user_params(struct file *file,
1584 struct snd_timer_params __user *_params)
1586 struct snd_timer_user *tu;
1587 struct snd_timer_params params;
1588 struct snd_timer *t;
1589 struct snd_timer_read *tr;
1590 struct snd_timer_tread *ttr;
1593 tu = file->private_data;
1596 t = tu->timeri->timer;
1599 if (copy_from_user(¶ms, _params, sizeof(params)))
1601 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1605 if (params.queue_size > 0 &&
1606 (params.queue_size < 32 || params.queue_size > 1024)) {
1610 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1611 (1<<SNDRV_TIMER_EVENT_TICK)|
1612 (1<<SNDRV_TIMER_EVENT_START)|
1613 (1<<SNDRV_TIMER_EVENT_STOP)|
1614 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1615 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1616 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1617 (1<<SNDRV_TIMER_EVENT_RESUME)|
1618 (1<<SNDRV_TIMER_EVENT_MSTART)|
1619 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1620 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1621 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1622 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1623 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1627 snd_timer_stop(tu->timeri);
1628 spin_lock_irq(&t->lock);
1629 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1630 SNDRV_TIMER_IFLG_EXCLUSIVE|
1631 SNDRV_TIMER_IFLG_EARLY_EVENT);
1632 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1633 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1634 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1635 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1636 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1637 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1638 spin_unlock_irq(&t->lock);
1639 if (params.queue_size > 0 &&
1640 (unsigned int)tu->queue_size != params.queue_size) {
1642 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1646 tu->queue_size = params.queue_size;
1650 tr = kmalloc(params.queue_size * sizeof(*tr),
1654 tu->queue_size = params.queue_size;
1659 tu->qhead = tu->qtail = tu->qused = 0;
1660 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1662 struct snd_timer_tread tread;
1663 tread.event = SNDRV_TIMER_EVENT_EARLY;
1664 tread.tstamp.tv_sec = 0;
1665 tread.tstamp.tv_nsec = 0;
1667 snd_timer_user_append_to_tqueue(tu, &tread);
1669 struct snd_timer_read *r = &tu->queue[0];
1676 tu->filter = params.filter;
1677 tu->ticks = params.ticks;
1680 if (copy_to_user(_params, ¶ms, sizeof(params)))
1685 static int snd_timer_user_status(struct file *file,
1686 struct snd_timer_status __user *_status)
1688 struct snd_timer_user *tu;
1689 struct snd_timer_status status;
1691 tu = file->private_data;
1694 memset(&status, 0, sizeof(status));
1695 status.tstamp = tu->tstamp;
1696 status.resolution = snd_timer_resolution(tu->timeri);
1697 status.lost = tu->timeri->lost;
1698 status.overrun = tu->overrun;
1699 spin_lock_irq(&tu->qlock);
1700 status.queue = tu->qused;
1701 spin_unlock_irq(&tu->qlock);
1702 if (copy_to_user(_status, &status, sizeof(status)))
1707 static int snd_timer_user_start(struct file *file)
1710 struct snd_timer_user *tu;
1712 tu = file->private_data;
1715 snd_timer_stop(tu->timeri);
1716 tu->timeri->lost = 0;
1717 tu->last_resolution = 0;
1718 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1721 static int snd_timer_user_stop(struct file *file)
1724 struct snd_timer_user *tu;
1726 tu = file->private_data;
1729 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1732 static int snd_timer_user_continue(struct file *file)
1735 struct snd_timer_user *tu;
1737 tu = file->private_data;
1740 tu->timeri->lost = 0;
1741 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1744 static int snd_timer_user_pause(struct file *file)
1747 struct snd_timer_user *tu;
1749 tu = file->private_data;
1752 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1756 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1757 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1758 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1759 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1762 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1765 struct snd_timer_user *tu;
1766 void __user *argp = (void __user *)arg;
1767 int __user *p = argp;
1769 tu = file->private_data;
1771 case SNDRV_TIMER_IOCTL_PVERSION:
1772 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1773 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1774 return snd_timer_user_next_device(argp);
1775 case SNDRV_TIMER_IOCTL_TREAD:
1779 mutex_lock(&tu->tread_sem);
1780 if (tu->timeri) { /* too late */
1781 mutex_unlock(&tu->tread_sem);
1784 if (get_user(xarg, p)) {
1785 mutex_unlock(&tu->tread_sem);
1788 tu->tread = xarg ? 1 : 0;
1789 mutex_unlock(&tu->tread_sem);
1792 case SNDRV_TIMER_IOCTL_GINFO:
1793 return snd_timer_user_ginfo(file, argp);
1794 case SNDRV_TIMER_IOCTL_GPARAMS:
1795 return snd_timer_user_gparams(file, argp);
1796 case SNDRV_TIMER_IOCTL_GSTATUS:
1797 return snd_timer_user_gstatus(file, argp);
1798 case SNDRV_TIMER_IOCTL_SELECT:
1799 return snd_timer_user_tselect(file, argp);
1800 case SNDRV_TIMER_IOCTL_INFO:
1801 return snd_timer_user_info(file, argp);
1802 case SNDRV_TIMER_IOCTL_PARAMS:
1803 return snd_timer_user_params(file, argp);
1804 case SNDRV_TIMER_IOCTL_STATUS:
1805 return snd_timer_user_status(file, argp);
1806 case SNDRV_TIMER_IOCTL_START:
1807 case SNDRV_TIMER_IOCTL_START_OLD:
1808 return snd_timer_user_start(file);
1809 case SNDRV_TIMER_IOCTL_STOP:
1810 case SNDRV_TIMER_IOCTL_STOP_OLD:
1811 return snd_timer_user_stop(file);
1812 case SNDRV_TIMER_IOCTL_CONTINUE:
1813 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1814 return snd_timer_user_continue(file);
1815 case SNDRV_TIMER_IOCTL_PAUSE:
1816 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1817 return snd_timer_user_pause(file);
1822 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1824 struct snd_timer_user *tu;
1827 tu = file->private_data;
1828 err = fasync_helper(fd, file, on, &tu->fasync);
1834 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1835 size_t count, loff_t *offset)
1837 struct snd_timer_user *tu;
1838 long result = 0, unit;
1841 tu = file->private_data;
1842 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1843 spin_lock_irq(&tu->qlock);
1844 while ((long)count - result >= unit) {
1845 while (!tu->qused) {
1848 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1853 set_current_state(TASK_INTERRUPTIBLE);
1854 init_waitqueue_entry(&wait, current);
1855 add_wait_queue(&tu->qchange_sleep, &wait);
1857 spin_unlock_irq(&tu->qlock);
1859 spin_lock_irq(&tu->qlock);
1861 remove_wait_queue(&tu->qchange_sleep, &wait);
1863 if (signal_pending(current)) {
1869 spin_unlock_irq(&tu->qlock);
1874 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1875 sizeof(struct snd_timer_tread))) {
1880 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1881 sizeof(struct snd_timer_read))) {
1887 tu->qhead %= tu->queue_size;
1892 spin_lock_irq(&tu->qlock);
1895 spin_unlock_irq(&tu->qlock);
1897 return result > 0 ? result : err;
1900 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1903 struct snd_timer_user *tu;
1905 tu = file->private_data;
1907 poll_wait(file, &tu->qchange_sleep, wait);
1911 mask |= POLLIN | POLLRDNORM;
1916 #ifdef CONFIG_COMPAT
1917 #include "timer_compat.c"
1919 #define snd_timer_user_ioctl_compat NULL
1922 static const struct file_operations snd_timer_f_ops =
1924 .owner = THIS_MODULE,
1925 .read = snd_timer_user_read,
1926 .open = snd_timer_user_open,
1927 .release = snd_timer_user_release,
1928 .poll = snd_timer_user_poll,
1929 .unlocked_ioctl = snd_timer_user_ioctl,
1930 .compat_ioctl = snd_timer_user_ioctl_compat,
1931 .fasync = snd_timer_user_fasync,
1938 static int __init alsa_timer_init(void)
1942 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1943 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1947 if ((err = snd_timer_register_system()) < 0)
1948 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1950 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1951 &snd_timer_f_ops, NULL, "timer")) < 0)
1952 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1954 snd_timer_proc_init();
1958 static void __exit alsa_timer_exit(void)
1960 struct list_head *p, *n;
1962 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1963 /* unregister the system timer */
1964 list_for_each_safe(p, n, &snd_timer_list) {
1965 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1966 snd_timer_free(timer);
1968 snd_timer_proc_done();
1969 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1970 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1974 module_init(alsa_timer_init)
1975 module_exit(alsa_timer_exit)
1977 EXPORT_SYMBOL(snd_timer_open);
1978 EXPORT_SYMBOL(snd_timer_close);
1979 EXPORT_SYMBOL(snd_timer_resolution);
1980 EXPORT_SYMBOL(snd_timer_start);
1981 EXPORT_SYMBOL(snd_timer_stop);
1982 EXPORT_SYMBOL(snd_timer_continue);
1983 EXPORT_SYMBOL(snd_timer_pause);
1984 EXPORT_SYMBOL(snd_timer_new);
1985 EXPORT_SYMBOL(snd_timer_notify);
1986 EXPORT_SYMBOL(snd_timer_global_new);
1987 EXPORT_SYMBOL(snd_timer_global_free);
1988 EXPORT_SYMBOL(snd_timer_global_register);
1989 EXPORT_SYMBOL(snd_timer_interrupt);