2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@suse.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/smp_lock.h>
26 #include <linux/slab.h>
27 #include <linux/time.h>
28 #include <linux/mutex.h>
29 #include <linux/moduleparam.h>
30 #include <linux/string.h>
31 #include <sound/core.h>
32 #include <sound/timer.h>
33 #include <sound/control.h>
34 #include <sound/info.h>
35 #include <sound/minors.h>
36 #include <sound/initval.h>
37 #include <linux/kmod.h>
39 #include <linux/kerneld.h>
42 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
43 #define DEFAULT_TIMER_LIMIT 3
44 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
45 #define DEFAULT_TIMER_LIMIT 2
47 #define DEFAULT_TIMER_LIMIT 1
50 static int timer_limit = DEFAULT_TIMER_LIMIT;
51 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>");
52 MODULE_DESCRIPTION("ALSA timer interface");
53 MODULE_LICENSE("GPL");
54 module_param(timer_limit, int, 0444);
55 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
57 struct snd_timer_user {
58 struct snd_timer_instance *timeri;
59 int tread; /* enhanced read with timestamps and events */
61 unsigned long overrun;
66 struct snd_timer_read *queue;
67 struct snd_timer_tread *tqueue;
69 unsigned long last_resolution;
71 struct timespec tstamp; /* trigger tstamp */
72 wait_queue_head_t qchange_sleep;
73 struct fasync_struct *fasync;
74 struct mutex tread_sem;
78 static LIST_HEAD(snd_timer_list);
80 /* list of slave instances */
81 static LIST_HEAD(snd_timer_slave_list);
83 /* lock for slave active lists */
84 static DEFINE_SPINLOCK(slave_active_lock);
86 static DEFINE_MUTEX(register_mutex);
88 static int snd_timer_free(struct snd_timer *timer);
89 static int snd_timer_dev_free(struct snd_device *device);
90 static int snd_timer_dev_register(struct snd_device *device);
91 static int snd_timer_dev_unregister(struct snd_device *device);
93 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
96 * create a timer instance with the given owner string.
97 * when timer is not NULL, increments the module counter
99 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
100 struct snd_timer *timer)
102 struct snd_timer_instance *timeri;
103 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
106 timeri->owner = kstrdup(owner, GFP_KERNEL);
107 if (! timeri->owner) {
111 INIT_LIST_HEAD(&timeri->open_list);
112 INIT_LIST_HEAD(&timeri->active_list);
113 INIT_LIST_HEAD(&timeri->ack_list);
114 INIT_LIST_HEAD(&timeri->slave_list_head);
115 INIT_LIST_HEAD(&timeri->slave_active_head);
117 timeri->timer = timer;
118 if (timer && !try_module_get(timer->module)) {
119 kfree(timeri->owner);
128 * find a timer instance from the given timer id
130 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
132 struct snd_timer *timer = NULL;
135 list_for_each(p, &snd_timer_list) {
136 timer = list_entry(p, struct snd_timer, device_list);
138 if (timer->tmr_class != tid->dev_class)
140 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
141 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
142 (timer->card == NULL ||
143 timer->card->number != tid->card))
145 if (timer->tmr_device != tid->device)
147 if (timer->tmr_subdevice != tid->subdevice)
156 static void snd_timer_request(struct snd_timer_id *tid)
158 if (! current->fs->root)
160 switch (tid->dev_class) {
161 case SNDRV_TIMER_CLASS_GLOBAL:
162 if (tid->device < timer_limit)
163 request_module("snd-timer-%i", tid->device);
165 case SNDRV_TIMER_CLASS_CARD:
166 case SNDRV_TIMER_CLASS_PCM:
167 if (tid->card < snd_ecards_limit)
168 request_module("snd-card-%i", tid->card);
178 * look for a master instance matching with the slave id of the given slave.
179 * when found, relink the open_link of the slave.
181 * call this with register_mutex down.
183 static void snd_timer_check_slave(struct snd_timer_instance *slave)
185 struct snd_timer *timer;
186 struct snd_timer_instance *master;
187 struct list_head *p, *q;
189 /* FIXME: it's really dumb to look up all entries.. */
190 list_for_each(p, &snd_timer_list) {
191 timer = list_entry(p, struct snd_timer, device_list);
192 list_for_each(q, &timer->open_list_head) {
193 master = list_entry(q, struct snd_timer_instance, open_list);
194 if (slave->slave_class == master->slave_class &&
195 slave->slave_id == master->slave_id) {
196 list_del(&slave->open_list);
197 list_add_tail(&slave->open_list,
198 &master->slave_list_head);
199 spin_lock_irq(&slave_active_lock);
200 slave->master = master;
201 slave->timer = master->timer;
202 spin_unlock_irq(&slave_active_lock);
210 * look for slave instances matching with the slave id of the given master.
211 * when found, relink the open_link of slaves.
213 * call this with register_mutex down.
215 static void snd_timer_check_master(struct snd_timer_instance *master)
217 struct snd_timer_instance *slave;
218 struct list_head *p, *n;
220 /* check all pending slaves */
221 list_for_each_safe(p, n, &snd_timer_slave_list) {
222 slave = list_entry(p, struct snd_timer_instance, open_list);
223 if (slave->slave_class == master->slave_class &&
224 slave->slave_id == master->slave_id) {
226 list_add_tail(p, &master->slave_list_head);
227 spin_lock_irq(&slave_active_lock);
228 slave->master = master;
229 slave->timer = master->timer;
230 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
231 list_add_tail(&slave->active_list,
232 &master->slave_active_head);
233 spin_unlock_irq(&slave_active_lock);
239 * open a timer instance
240 * when opening a master, the slave id must be here given.
242 int snd_timer_open(struct snd_timer_instance **ti,
243 char *owner, struct snd_timer_id *tid,
244 unsigned int slave_id)
246 struct snd_timer *timer;
247 struct snd_timer_instance *timeri = NULL;
249 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
250 /* open a slave instance */
251 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
252 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
253 snd_printd("invalid slave class %i\n", tid->dev_sclass);
256 mutex_lock(®ister_mutex);
257 timeri = snd_timer_instance_new(owner, NULL);
259 mutex_unlock(®ister_mutex);
262 timeri->slave_class = tid->dev_sclass;
263 timeri->slave_id = tid->device;
264 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
265 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
266 snd_timer_check_slave(timeri);
267 mutex_unlock(®ister_mutex);
272 /* open a master instance */
273 mutex_lock(®ister_mutex);
274 timer = snd_timer_find(tid);
277 mutex_unlock(®ister_mutex);
278 snd_timer_request(tid);
279 mutex_lock(®ister_mutex);
280 timer = snd_timer_find(tid);
284 mutex_unlock(®ister_mutex);
287 if (!list_empty(&timer->open_list_head)) {
288 timeri = list_entry(timer->open_list_head.next,
289 struct snd_timer_instance, open_list);
290 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
291 mutex_unlock(®ister_mutex);
295 timeri = snd_timer_instance_new(owner, timer);
297 mutex_unlock(®ister_mutex);
300 timeri->slave_class = tid->dev_sclass;
301 timeri->slave_id = slave_id;
302 if (list_empty(&timer->open_list_head) && timer->hw.open)
303 timer->hw.open(timer);
304 list_add_tail(&timeri->open_list, &timer->open_list_head);
305 snd_timer_check_master(timeri);
306 mutex_unlock(®ister_mutex);
311 static int _snd_timer_stop(struct snd_timer_instance *timeri,
312 int keep_flag, int event);
315 * close a timer instance
317 int snd_timer_close(struct snd_timer_instance *timeri)
319 struct snd_timer *timer = NULL;
320 struct list_head *p, *n;
321 struct snd_timer_instance *slave;
323 snd_assert(timeri != NULL, return -ENXIO);
325 /* force to stop the timer */
326 snd_timer_stop(timeri);
328 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
329 /* wait, until the active callback is finished */
330 spin_lock_irq(&slave_active_lock);
331 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
332 spin_unlock_irq(&slave_active_lock);
334 spin_lock_irq(&slave_active_lock);
336 spin_unlock_irq(&slave_active_lock);
337 mutex_lock(®ister_mutex);
338 list_del(&timeri->open_list);
339 mutex_unlock(®ister_mutex);
341 timer = timeri->timer;
342 /* wait, until the active callback is finished */
343 spin_lock_irq(&timer->lock);
344 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
345 spin_unlock_irq(&timer->lock);
347 spin_lock_irq(&timer->lock);
349 spin_unlock_irq(&timer->lock);
350 mutex_lock(®ister_mutex);
351 list_del(&timeri->open_list);
352 if (timer && list_empty(&timer->open_list_head) &&
354 timer->hw.close(timer);
355 /* remove slave links */
356 list_for_each_safe(p, n, &timeri->slave_list_head) {
357 slave = list_entry(p, struct snd_timer_instance, open_list);
358 spin_lock_irq(&slave_active_lock);
359 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
361 list_add_tail(p, &snd_timer_slave_list);
362 slave->master = NULL;
364 spin_unlock_irq(&slave_active_lock);
366 mutex_unlock(®ister_mutex);
368 if (timeri->private_free)
369 timeri->private_free(timeri);
370 kfree(timeri->owner);
373 module_put(timer->module);
377 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
379 struct snd_timer * timer;
383 if ((timer = timeri->timer) != NULL) {
384 if (timer->hw.c_resolution)
385 return timer->hw.c_resolution(timer);
386 return timer->hw.resolution;
391 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
393 struct snd_timer *timer;
395 unsigned long resolution = 0;
396 struct snd_timer_instance *ts;
398 struct timespec tstamp;
400 getnstimeofday(&tstamp);
401 snd_assert(event >= SNDRV_TIMER_EVENT_START &&
402 event <= SNDRV_TIMER_EVENT_PAUSE, return);
403 if (event == SNDRV_TIMER_EVENT_START ||
404 event == SNDRV_TIMER_EVENT_CONTINUE)
405 resolution = snd_timer_resolution(ti);
407 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
408 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
413 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
415 spin_lock_irqsave(&timer->lock, flags);
416 list_for_each(n, &ti->slave_active_head) {
417 ts = list_entry(n, struct snd_timer_instance, active_list);
419 ts->ccallback(ti, event + 100, &tstamp, resolution);
421 spin_unlock_irqrestore(&timer->lock, flags);
424 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
425 unsigned long sticks)
427 list_del(&timeri->active_list);
428 list_add_tail(&timeri->active_list, &timer->active_list_head);
429 if (timer->running) {
430 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
432 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
433 timeri->flags |= SNDRV_TIMER_IFLG_START;
434 return 1; /* delayed start */
436 timer->sticks = sticks;
437 timer->hw.start(timer);
440 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
445 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
449 spin_lock_irqsave(&slave_active_lock, flags);
450 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
452 list_add_tail(&timeri->active_list,
453 &timeri->master->slave_active_head);
454 spin_unlock_irqrestore(&slave_active_lock, flags);
455 return 1; /* delayed start */
459 * start the timer instance
461 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
463 struct snd_timer *timer;
464 int result = -EINVAL;
467 if (timeri == NULL || ticks < 1)
469 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
470 result = snd_timer_start_slave(timeri);
471 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
474 timer = timeri->timer;
477 spin_lock_irqsave(&timer->lock, flags);
478 timeri->ticks = timeri->cticks = ticks;
480 result = snd_timer_start1(timer, timeri, ticks);
481 spin_unlock_irqrestore(&timer->lock, flags);
482 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
486 static int _snd_timer_stop(struct snd_timer_instance * timeri,
487 int keep_flag, int event)
489 struct snd_timer *timer;
492 snd_assert(timeri != NULL, return -ENXIO);
494 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
496 spin_lock_irqsave(&slave_active_lock, flags);
497 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
498 spin_unlock_irqrestore(&slave_active_lock, flags);
502 timer = timeri->timer;
505 spin_lock_irqsave(&timer->lock, flags);
506 list_del_init(&timeri->ack_list);
507 list_del_init(&timeri->active_list);
508 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
509 !(--timer->running)) {
510 timer->hw.stop(timer);
511 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
512 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
513 snd_timer_reschedule(timer, 0);
514 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
515 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
516 timer->hw.start(timer);
522 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
523 spin_unlock_irqrestore(&timer->lock, flags);
525 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
526 snd_timer_notify1(timeri, event);
531 * stop the timer instance.
533 * do not call this from the timer callback!
535 int snd_timer_stop(struct snd_timer_instance *timeri)
537 struct snd_timer *timer;
541 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
544 timer = timeri->timer;
545 spin_lock_irqsave(&timer->lock, flags);
546 timeri->cticks = timeri->ticks;
548 spin_unlock_irqrestore(&timer->lock, flags);
553 * start again.. the tick is kept.
555 int snd_timer_continue(struct snd_timer_instance *timeri)
557 struct snd_timer *timer;
558 int result = -EINVAL;
563 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
564 return snd_timer_start_slave(timeri);
565 timer = timeri->timer;
568 spin_lock_irqsave(&timer->lock, flags);
572 result = snd_timer_start1(timer, timeri, timer->sticks);
573 spin_unlock_irqrestore(&timer->lock, flags);
574 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
579 * pause.. remember the ticks left
581 int snd_timer_pause(struct snd_timer_instance * timeri)
583 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
587 * reschedule the timer
589 * start pending instances and check the scheduling ticks.
590 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
592 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
594 struct snd_timer_instance *ti;
595 unsigned long ticks = ~0UL;
598 list_for_each(p, &timer->active_list_head) {
599 ti = list_entry(p, struct snd_timer_instance, active_list);
600 if (ti->flags & SNDRV_TIMER_IFLG_START) {
601 ti->flags &= ~SNDRV_TIMER_IFLG_START;
602 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
605 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
606 if (ticks > ti->cticks)
611 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
614 if (ticks > timer->hw.ticks)
615 ticks = timer->hw.ticks;
616 if (ticks_left != ticks)
617 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
618 timer->sticks = ticks;
625 static void snd_timer_tasklet(unsigned long arg)
627 struct snd_timer *timer = (struct snd_timer *) arg;
628 struct snd_timer_instance *ti;
630 unsigned long resolution, ticks;
633 spin_lock_irqsave(&timer->lock, flags);
634 /* now process all callbacks */
635 while (!list_empty(&timer->sack_list_head)) {
636 p = timer->sack_list_head.next; /* get first item */
637 ti = list_entry(p, struct snd_timer_instance, ack_list);
639 /* remove from ack_list and make empty */
644 resolution = ti->resolution;
646 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
647 spin_unlock(&timer->lock);
649 ti->callback(ti, resolution, ticks);
650 spin_lock(&timer->lock);
651 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
653 spin_unlock_irqrestore(&timer->lock, flags);
659 * ticks_left is usually equal to timer->sticks.
662 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
664 struct snd_timer_instance *ti, *ts;
665 unsigned long resolution, ticks;
666 struct list_head *p, *q, *n, *ack_list_head;
673 spin_lock_irqsave(&timer->lock, flags);
675 /* remember the current resolution */
676 if (timer->hw.c_resolution)
677 resolution = timer->hw.c_resolution(timer);
679 resolution = timer->hw.resolution;
681 /* loop for all active instances
682 * Here we cannot use list_for_each because the active_list of a
683 * processed instance is relinked to done_list_head before the callback
686 list_for_each_safe(p, n, &timer->active_list_head) {
687 ti = list_entry(p, struct snd_timer_instance, active_list);
688 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
690 ti->pticks += ticks_left;
691 ti->resolution = resolution;
692 if (ti->cticks < ticks_left)
695 ti->cticks -= ticks_left;
696 if (ti->cticks) /* not expired */
698 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
699 ti->cticks = ti->ticks;
701 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
702 if (--timer->running)
705 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
706 (ti->flags & SNDRV_TIMER_IFLG_FAST))
707 ack_list_head = &timer->ack_list_head;
709 ack_list_head = &timer->sack_list_head;
710 if (list_empty(&ti->ack_list))
711 list_add_tail(&ti->ack_list, ack_list_head);
712 list_for_each(q, &ti->slave_active_head) {
713 ts = list_entry(q, struct snd_timer_instance, active_list);
714 ts->pticks = ti->pticks;
715 ts->resolution = resolution;
716 if (list_empty(&ts->ack_list))
717 list_add_tail(&ts->ack_list, ack_list_head);
720 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
721 snd_timer_reschedule(timer, ticks_left);
722 if (timer->running) {
723 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
724 timer->hw.stop(timer);
725 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
727 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
728 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
730 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
731 timer->hw.start(timer);
734 timer->hw.stop(timer);
737 /* now process all fast callbacks */
738 while (!list_empty(&timer->ack_list_head)) {
739 p = timer->ack_list_head.next; /* get first item */
740 ti = list_entry(p, struct snd_timer_instance, ack_list);
742 /* remove from ack_list and make empty */
748 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
749 spin_unlock(&timer->lock);
751 ti->callback(ti, resolution, ticks);
752 spin_lock(&timer->lock);
753 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
756 /* do we have any slow callbacks? */
757 use_tasklet = !list_empty(&timer->sack_list_head);
758 spin_unlock_irqrestore(&timer->lock, flags);
761 tasklet_hi_schedule(&timer->task_queue);
768 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
769 struct snd_timer **rtimer)
771 struct snd_timer *timer;
773 static struct snd_device_ops ops = {
774 .dev_free = snd_timer_dev_free,
775 .dev_register = snd_timer_dev_register,
776 .dev_unregister = snd_timer_dev_unregister
779 snd_assert(tid != NULL, return -EINVAL);
780 snd_assert(rtimer != NULL, return -EINVAL);
782 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
784 snd_printk(KERN_ERR "timer: cannot allocate\n");
787 timer->tmr_class = tid->dev_class;
789 timer->tmr_device = tid->device;
790 timer->tmr_subdevice = tid->subdevice;
792 strlcpy(timer->id, id, sizeof(timer->id));
793 INIT_LIST_HEAD(&timer->device_list);
794 INIT_LIST_HEAD(&timer->open_list_head);
795 INIT_LIST_HEAD(&timer->active_list_head);
796 INIT_LIST_HEAD(&timer->ack_list_head);
797 INIT_LIST_HEAD(&timer->sack_list_head);
798 spin_lock_init(&timer->lock);
799 tasklet_init(&timer->task_queue, snd_timer_tasklet,
800 (unsigned long)timer);
802 timer->module = card->module;
803 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
805 snd_timer_free(timer);
813 static int snd_timer_free(struct snd_timer *timer)
815 snd_assert(timer != NULL, return -ENXIO);
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;
834 snd_assert(timer != NULL && timer->hw.start != NULL &&
835 timer->hw.stop != NULL, return -ENXIO);
836 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
837 !timer->hw.resolution && timer->hw.c_resolution == NULL)
840 mutex_lock(®ister_mutex);
841 list_for_each(p, &snd_timer_list) {
842 timer1 = list_entry(p, struct snd_timer, device_list);
843 if (timer1->tmr_class > timer->tmr_class)
845 if (timer1->tmr_class < timer->tmr_class)
847 if (timer1->card && timer->card) {
848 if (timer1->card->number > timer->card->number)
850 if (timer1->card->number < timer->card->number)
853 if (timer1->tmr_device > timer->tmr_device)
855 if (timer1->tmr_device < timer->tmr_device)
857 if (timer1->tmr_subdevice > timer->tmr_subdevice)
859 if (timer1->tmr_subdevice < timer->tmr_subdevice)
862 mutex_unlock(®ister_mutex);
865 list_add_tail(&timer->device_list, p);
866 mutex_unlock(®ister_mutex);
870 static int snd_timer_unregister(struct snd_timer *timer)
872 struct list_head *p, *n;
873 struct snd_timer_instance *ti;
875 snd_assert(timer != NULL, return -ENXIO);
876 mutex_lock(®ister_mutex);
877 if (! list_empty(&timer->open_list_head)) {
878 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer);
879 list_for_each_safe(p, n, &timer->open_list_head) {
881 ti = list_entry(p, struct snd_timer_instance, open_list);
885 list_del(&timer->device_list);
886 mutex_unlock(®ister_mutex);
887 return snd_timer_free(timer);
890 static int snd_timer_dev_unregister(struct snd_device *device)
892 struct snd_timer *timer = device->device_data;
893 return snd_timer_unregister(timer);
896 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
899 unsigned long resolution = 0;
900 struct snd_timer_instance *ti, *ts;
901 struct list_head *p, *n;
903 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
905 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART &&
906 event <= SNDRV_TIMER_EVENT_MRESUME, return);
907 spin_lock_irqsave(&timer->lock, flags);
908 if (event == SNDRV_TIMER_EVENT_MSTART ||
909 event == SNDRV_TIMER_EVENT_MCONTINUE ||
910 event == SNDRV_TIMER_EVENT_MRESUME) {
911 if (timer->hw.c_resolution)
912 resolution = timer->hw.c_resolution(timer);
914 resolution = timer->hw.resolution;
916 list_for_each(p, &timer->active_list_head) {
917 ti = list_entry(p, struct snd_timer_instance, active_list);
919 ti->ccallback(ti, event, tstamp, resolution);
920 list_for_each(n, &ti->slave_active_head) {
921 ts = list_entry(n, struct snd_timer_instance, active_list);
923 ts->ccallback(ts, event, tstamp, resolution);
926 spin_unlock_irqrestore(&timer->lock, flags);
930 * exported functions for global timers
932 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
934 struct snd_timer_id tid;
936 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
937 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
941 return snd_timer_new(NULL, id, &tid, rtimer);
944 int snd_timer_global_free(struct snd_timer *timer)
946 return snd_timer_free(timer);
949 int snd_timer_global_register(struct snd_timer *timer)
951 struct snd_device dev;
953 memset(&dev, 0, sizeof(dev));
954 dev.device_data = timer;
955 return snd_timer_dev_register(&dev);
958 int snd_timer_global_unregister(struct snd_timer *timer)
960 return snd_timer_unregister(timer);
967 struct snd_timer_system_private {
968 struct timer_list tlist;
969 struct timer * timer;
970 unsigned long last_expires;
971 unsigned long last_jiffies;
972 unsigned long correction;
975 static void snd_timer_s_function(unsigned long data)
977 struct snd_timer *timer = (struct snd_timer *)data;
978 struct snd_timer_system_private *priv = timer->private_data;
979 unsigned long jiff = jiffies;
980 if (time_after(jiff, priv->last_expires))
981 priv->correction = (long)jiff - (long)priv->last_expires;
982 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
985 static int snd_timer_s_start(struct snd_timer * timer)
987 struct snd_timer_system_private *priv;
990 priv = (struct snd_timer_system_private *) timer->private_data;
991 njiff = (priv->last_jiffies = jiffies);
992 if (priv->correction > timer->sticks - 1) {
993 priv->correction -= timer->sticks - 1;
996 njiff += timer->sticks - priv->correction;
997 priv->correction -= timer->sticks;
999 priv->last_expires = priv->tlist.expires = njiff;
1000 add_timer(&priv->tlist);
1004 static int snd_timer_s_stop(struct snd_timer * timer)
1006 struct snd_timer_system_private *priv;
1009 priv = (struct snd_timer_system_private *) timer->private_data;
1010 del_timer(&priv->tlist);
1012 if (time_before(jiff, priv->last_expires))
1013 timer->sticks = priv->last_expires - jiff;
1019 static struct snd_timer_hardware snd_timer_system =
1021 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1022 .resolution = 1000000000L / HZ,
1024 .start = snd_timer_s_start,
1025 .stop = snd_timer_s_stop
1028 static void snd_timer_free_system(struct snd_timer *timer)
1030 kfree(timer->private_data);
1033 static int snd_timer_register_system(void)
1035 struct snd_timer *timer;
1036 struct snd_timer_system_private *priv;
1039 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1042 strcpy(timer->name, "system timer");
1043 timer->hw = snd_timer_system;
1044 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1046 snd_timer_free(timer);
1049 init_timer(&priv->tlist);
1050 priv->tlist.function = snd_timer_s_function;
1051 priv->tlist.data = (unsigned long) timer;
1052 timer->private_data = priv;
1053 timer->private_free = snd_timer_free_system;
1054 return snd_timer_global_register(timer);
1057 #ifdef CONFIG_PROC_FS
1062 static void snd_timer_proc_read(struct snd_info_entry *entry,
1063 struct snd_info_buffer *buffer)
1065 unsigned long flags;
1066 struct snd_timer *timer;
1067 struct snd_timer_instance *ti;
1068 struct list_head *p, *q;
1070 mutex_lock(®ister_mutex);
1071 list_for_each(p, &snd_timer_list) {
1072 timer = list_entry(p, struct snd_timer, device_list);
1073 switch (timer->tmr_class) {
1074 case SNDRV_TIMER_CLASS_GLOBAL:
1075 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1077 case SNDRV_TIMER_CLASS_CARD:
1078 snd_iprintf(buffer, "C%i-%i: ",
1079 timer->card->number, timer->tmr_device);
1081 case SNDRV_TIMER_CLASS_PCM:
1082 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1083 timer->tmr_device, timer->tmr_subdevice);
1086 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1087 timer->card ? timer->card->number : -1,
1088 timer->tmr_device, timer->tmr_subdevice);
1090 snd_iprintf(buffer, "%s :", timer->name);
1091 if (timer->hw.resolution)
1092 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1093 timer->hw.resolution / 1000,
1094 timer->hw.resolution % 1000,
1096 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1097 snd_iprintf(buffer, " SLAVE");
1098 snd_iprintf(buffer, "\n");
1099 spin_lock_irqsave(&timer->lock, flags);
1100 list_for_each(q, &timer->open_list_head) {
1101 ti = list_entry(q, struct snd_timer_instance, open_list);
1102 snd_iprintf(buffer, " Client %s : %s\n",
1103 ti->owner ? ti->owner : "unknown",
1104 ti->flags & (SNDRV_TIMER_IFLG_START |
1105 SNDRV_TIMER_IFLG_RUNNING)
1106 ? "running" : "stopped");
1108 spin_unlock_irqrestore(&timer->lock, flags);
1110 mutex_unlock(®ister_mutex);
1113 static struct snd_info_entry *snd_timer_proc_entry = NULL;
1115 static void __init snd_timer_proc_init(void)
1117 struct snd_info_entry *entry;
1119 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1120 if (entry != NULL) {
1121 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128;
1122 entry->c.text.read = snd_timer_proc_read;
1123 if (snd_info_register(entry) < 0) {
1124 snd_info_free_entry(entry);
1128 snd_timer_proc_entry = entry;
1131 static void __exit snd_timer_proc_done(void)
1133 snd_info_unregister(snd_timer_proc_entry);
1135 #else /* !CONFIG_PROC_FS */
1136 #define snd_timer_proc_init()
1137 #define snd_timer_proc_done()
1141 * USER SPACE interface
1144 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1145 unsigned long resolution,
1146 unsigned long ticks)
1148 struct snd_timer_user *tu = timeri->callback_data;
1149 struct snd_timer_read *r;
1152 spin_lock(&tu->qlock);
1153 if (tu->qused > 0) {
1154 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1155 r = &tu->queue[prev];
1156 if (r->resolution == resolution) {
1161 if (tu->qused >= tu->queue_size) {
1164 r = &tu->queue[tu->qtail++];
1165 tu->qtail %= tu->queue_size;
1166 r->resolution = resolution;
1171 spin_unlock(&tu->qlock);
1172 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1173 wake_up(&tu->qchange_sleep);
1176 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1177 struct snd_timer_tread *tread)
1179 if (tu->qused >= tu->queue_size) {
1182 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1183 tu->qtail %= tu->queue_size;
1188 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1190 struct timespec *tstamp,
1191 unsigned long resolution)
1193 struct snd_timer_user *tu = timeri->callback_data;
1194 struct snd_timer_tread r1;
1196 if (event >= SNDRV_TIMER_EVENT_START &&
1197 event <= SNDRV_TIMER_EVENT_PAUSE)
1198 tu->tstamp = *tstamp;
1199 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1202 r1.tstamp = *tstamp;
1203 r1.val = resolution;
1204 spin_lock(&tu->qlock);
1205 snd_timer_user_append_to_tqueue(tu, &r1);
1206 spin_unlock(&tu->qlock);
1207 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1208 wake_up(&tu->qchange_sleep);
1211 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1212 unsigned long resolution,
1213 unsigned long ticks)
1215 struct snd_timer_user *tu = timeri->callback_data;
1216 struct snd_timer_tread *r, r1;
1217 struct timespec tstamp;
1218 int prev, append = 0;
1220 memset(&tstamp, 0, sizeof(tstamp));
1221 spin_lock(&tu->qlock);
1222 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1223 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1224 spin_unlock(&tu->qlock);
1227 if (tu->last_resolution != resolution || ticks > 0)
1228 getnstimeofday(&tstamp);
1229 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1230 tu->last_resolution != resolution) {
1231 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1233 r1.val = resolution;
1234 snd_timer_user_append_to_tqueue(tu, &r1);
1235 tu->last_resolution = resolution;
1238 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1242 if (tu->qused > 0) {
1243 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1244 r = &tu->tqueue[prev];
1245 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1252 r1.event = SNDRV_TIMER_EVENT_TICK;
1255 snd_timer_user_append_to_tqueue(tu, &r1);
1258 spin_unlock(&tu->qlock);
1261 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1262 wake_up(&tu->qchange_sleep);
1265 static int snd_timer_user_open(struct inode *inode, struct file *file)
1267 struct snd_timer_user *tu;
1269 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1272 spin_lock_init(&tu->qlock);
1273 init_waitqueue_head(&tu->qchange_sleep);
1274 mutex_init(&tu->tread_sem);
1276 tu->queue_size = 128;
1277 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1279 if (tu->queue == NULL) {
1283 file->private_data = tu;
1287 static int snd_timer_user_release(struct inode *inode, struct file *file)
1289 struct snd_timer_user *tu;
1291 if (file->private_data) {
1292 tu = file->private_data;
1293 file->private_data = NULL;
1294 fasync_helper(-1, file, 0, &tu->fasync);
1296 snd_timer_close(tu->timeri);
1304 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1306 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1307 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1313 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1315 id->dev_class = timer->tmr_class;
1316 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1317 id->card = timer->card ? timer->card->number : -1;
1318 id->device = timer->tmr_device;
1319 id->subdevice = timer->tmr_subdevice;
1322 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1324 struct snd_timer_id id;
1325 struct snd_timer *timer;
1326 struct list_head *p;
1328 if (copy_from_user(&id, _tid, sizeof(id)))
1330 mutex_lock(®ister_mutex);
1331 if (id.dev_class < 0) { /* first item */
1332 if (list_empty(&snd_timer_list))
1333 snd_timer_user_zero_id(&id);
1335 timer = list_entry(snd_timer_list.next,
1336 struct snd_timer, device_list);
1337 snd_timer_user_copy_id(&id, timer);
1340 switch (id.dev_class) {
1341 case SNDRV_TIMER_CLASS_GLOBAL:
1342 id.device = id.device < 0 ? 0 : id.device + 1;
1343 list_for_each(p, &snd_timer_list) {
1344 timer = list_entry(p, struct snd_timer, device_list);
1345 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1346 snd_timer_user_copy_id(&id, timer);
1349 if (timer->tmr_device >= id.device) {
1350 snd_timer_user_copy_id(&id, timer);
1354 if (p == &snd_timer_list)
1355 snd_timer_user_zero_id(&id);
1357 case SNDRV_TIMER_CLASS_CARD:
1358 case SNDRV_TIMER_CLASS_PCM:
1365 if (id.device < 0) {
1368 if (id.subdevice < 0) {
1376 list_for_each(p, &snd_timer_list) {
1377 timer = list_entry(p, struct snd_timer, device_list);
1378 if (timer->tmr_class > id.dev_class) {
1379 snd_timer_user_copy_id(&id, timer);
1382 if (timer->tmr_class < id.dev_class)
1384 if (timer->card->number > id.card) {
1385 snd_timer_user_copy_id(&id, timer);
1388 if (timer->card->number < id.card)
1390 if (timer->tmr_device > id.device) {
1391 snd_timer_user_copy_id(&id, timer);
1394 if (timer->tmr_device < id.device)
1396 if (timer->tmr_subdevice > id.subdevice) {
1397 snd_timer_user_copy_id(&id, timer);
1400 if (timer->tmr_subdevice < id.subdevice)
1402 snd_timer_user_copy_id(&id, timer);
1405 if (p == &snd_timer_list)
1406 snd_timer_user_zero_id(&id);
1409 snd_timer_user_zero_id(&id);
1412 mutex_unlock(®ister_mutex);
1413 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1418 static int snd_timer_user_ginfo(struct file *file,
1419 struct snd_timer_ginfo __user *_ginfo)
1421 struct snd_timer_ginfo *ginfo;
1422 struct snd_timer_id tid;
1423 struct snd_timer *t;
1424 struct list_head *p;
1427 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1430 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1435 memset(ginfo, 0, sizeof(*ginfo));
1437 mutex_lock(®ister_mutex);
1438 t = snd_timer_find(&tid);
1440 ginfo->card = t->card ? t->card->number : -1;
1441 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1442 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1443 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1444 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1445 ginfo->resolution = t->hw.resolution;
1446 if (t->hw.resolution_min > 0) {
1447 ginfo->resolution_min = t->hw.resolution_min;
1448 ginfo->resolution_max = t->hw.resolution_max;
1450 list_for_each(p, &t->open_list_head) {
1456 mutex_unlock(®ister_mutex);
1457 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1463 static int snd_timer_user_gparams(struct file *file,
1464 struct snd_timer_gparams __user *_gparams)
1466 struct snd_timer_gparams gparams;
1467 struct snd_timer *t;
1470 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1472 mutex_lock(®ister_mutex);
1473 t = snd_timer_find(&gparams.tid);
1478 if (!list_empty(&t->open_list_head)) {
1482 if (!t->hw.set_period) {
1486 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1488 mutex_unlock(®ister_mutex);
1492 static int snd_timer_user_gstatus(struct file *file,
1493 struct snd_timer_gstatus __user *_gstatus)
1495 struct snd_timer_gstatus gstatus;
1496 struct snd_timer_id tid;
1497 struct snd_timer *t;
1500 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1503 memset(&gstatus, 0, sizeof(gstatus));
1505 mutex_lock(®ister_mutex);
1506 t = snd_timer_find(&tid);
1508 if (t->hw.c_resolution)
1509 gstatus.resolution = t->hw.c_resolution(t);
1511 gstatus.resolution = t->hw.resolution;
1512 if (t->hw.precise_resolution) {
1513 t->hw.precise_resolution(t, &gstatus.resolution_num,
1514 &gstatus.resolution_den);
1516 gstatus.resolution_num = gstatus.resolution;
1517 gstatus.resolution_den = 1000000000uL;
1522 mutex_unlock(®ister_mutex);
1523 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1528 static int snd_timer_user_tselect(struct file *file,
1529 struct snd_timer_select __user *_tselect)
1531 struct snd_timer_user *tu;
1532 struct snd_timer_select tselect;
1536 tu = file->private_data;
1537 mutex_lock(&tu->tread_sem);
1539 snd_timer_close(tu->timeri);
1542 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1546 sprintf(str, "application %i", current->pid);
1547 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1548 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1549 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1558 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1560 if (tu->tqueue == NULL)
1563 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1565 if (tu->queue == NULL)
1570 snd_timer_close(tu->timeri);
1573 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1574 tu->timeri->callback = tu->tread
1575 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1576 tu->timeri->ccallback = snd_timer_user_ccallback;
1577 tu->timeri->callback_data = (void *)tu;
1581 mutex_unlock(&tu->tread_sem);
1585 static int snd_timer_user_info(struct file *file,
1586 struct snd_timer_info __user *_info)
1588 struct snd_timer_user *tu;
1589 struct snd_timer_info *info;
1590 struct snd_timer *t;
1593 tu = file->private_data;
1594 snd_assert(tu->timeri != NULL, return -ENXIO);
1595 t = tu->timeri->timer;
1596 snd_assert(t != NULL, return -ENXIO);
1598 info = kzalloc(sizeof(*info), GFP_KERNEL);
1601 info->card = t->card ? t->card->number : -1;
1602 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1603 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1604 strlcpy(info->id, t->id, sizeof(info->id));
1605 strlcpy(info->name, t->name, sizeof(info->name));
1606 info->resolution = t->hw.resolution;
1607 if (copy_to_user(_info, info, sizeof(*_info)))
1613 static int snd_timer_user_params(struct file *file,
1614 struct snd_timer_params __user *_params)
1616 struct snd_timer_user *tu;
1617 struct snd_timer_params params;
1618 struct snd_timer *t;
1619 struct snd_timer_read *tr;
1620 struct snd_timer_tread *ttr;
1623 tu = file->private_data;
1624 snd_assert(tu->timeri != NULL, return -ENXIO);
1625 t = tu->timeri->timer;
1626 snd_assert(t != NULL, return -ENXIO);
1627 if (copy_from_user(¶ms, _params, sizeof(params)))
1629 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1633 if (params.queue_size > 0 &&
1634 (params.queue_size < 32 || params.queue_size > 1024)) {
1638 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1639 (1<<SNDRV_TIMER_EVENT_TICK)|
1640 (1<<SNDRV_TIMER_EVENT_START)|
1641 (1<<SNDRV_TIMER_EVENT_STOP)|
1642 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1643 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1644 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1645 (1<<SNDRV_TIMER_EVENT_RESUME)|
1646 (1<<SNDRV_TIMER_EVENT_MSTART)|
1647 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1648 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1649 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1650 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1651 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1655 snd_timer_stop(tu->timeri);
1656 spin_lock_irq(&t->lock);
1657 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1658 SNDRV_TIMER_IFLG_EXCLUSIVE|
1659 SNDRV_TIMER_IFLG_EARLY_EVENT);
1660 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1661 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1662 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1663 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1664 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1665 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1666 spin_unlock_irq(&t->lock);
1667 if (params.queue_size > 0 &&
1668 (unsigned int)tu->queue_size != params.queue_size) {
1670 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1674 tu->queue_size = params.queue_size;
1678 tr = kmalloc(params.queue_size * sizeof(*tr),
1682 tu->queue_size = params.queue_size;
1687 tu->qhead = tu->qtail = tu->qused = 0;
1688 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1690 struct snd_timer_tread tread;
1691 tread.event = SNDRV_TIMER_EVENT_EARLY;
1692 tread.tstamp.tv_sec = 0;
1693 tread.tstamp.tv_nsec = 0;
1695 snd_timer_user_append_to_tqueue(tu, &tread);
1697 struct snd_timer_read *r = &tu->queue[0];
1704 tu->filter = params.filter;
1705 tu->ticks = params.ticks;
1708 if (copy_to_user(_params, ¶ms, sizeof(params)))
1713 static int snd_timer_user_status(struct file *file,
1714 struct snd_timer_status __user *_status)
1716 struct snd_timer_user *tu;
1717 struct snd_timer_status status;
1719 tu = file->private_data;
1720 snd_assert(tu->timeri != NULL, return -ENXIO);
1721 memset(&status, 0, sizeof(status));
1722 status.tstamp = tu->tstamp;
1723 status.resolution = snd_timer_resolution(tu->timeri);
1724 status.lost = tu->timeri->lost;
1725 status.overrun = tu->overrun;
1726 spin_lock_irq(&tu->qlock);
1727 status.queue = tu->qused;
1728 spin_unlock_irq(&tu->qlock);
1729 if (copy_to_user(_status, &status, sizeof(status)))
1734 static int snd_timer_user_start(struct file *file)
1737 struct snd_timer_user *tu;
1739 tu = file->private_data;
1740 snd_assert(tu->timeri != NULL, return -ENXIO);
1741 snd_timer_stop(tu->timeri);
1742 tu->timeri->lost = 0;
1743 tu->last_resolution = 0;
1744 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1747 static int snd_timer_user_stop(struct file *file)
1750 struct snd_timer_user *tu;
1752 tu = file->private_data;
1753 snd_assert(tu->timeri != NULL, return -ENXIO);
1754 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1757 static int snd_timer_user_continue(struct file *file)
1760 struct snd_timer_user *tu;
1762 tu = file->private_data;
1763 snd_assert(tu->timeri != NULL, return -ENXIO);
1764 tu->timeri->lost = 0;
1765 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1768 static int snd_timer_user_pause(struct file *file)
1771 struct snd_timer_user *tu;
1773 tu = file->private_data;
1774 snd_assert(tu->timeri != NULL, return -ENXIO);
1775 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1779 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1780 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1781 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1782 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1785 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1788 struct snd_timer_user *tu;
1789 void __user *argp = (void __user *)arg;
1790 int __user *p = argp;
1792 tu = file->private_data;
1794 case SNDRV_TIMER_IOCTL_PVERSION:
1795 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1796 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1797 return snd_timer_user_next_device(argp);
1798 case SNDRV_TIMER_IOCTL_TREAD:
1802 mutex_lock(&tu->tread_sem);
1803 if (tu->timeri) { /* too late */
1804 mutex_unlock(&tu->tread_sem);
1807 if (get_user(xarg, p)) {
1808 mutex_unlock(&tu->tread_sem);
1811 tu->tread = xarg ? 1 : 0;
1812 mutex_unlock(&tu->tread_sem);
1815 case SNDRV_TIMER_IOCTL_GINFO:
1816 return snd_timer_user_ginfo(file, argp);
1817 case SNDRV_TIMER_IOCTL_GPARAMS:
1818 return snd_timer_user_gparams(file, argp);
1819 case SNDRV_TIMER_IOCTL_GSTATUS:
1820 return snd_timer_user_gstatus(file, argp);
1821 case SNDRV_TIMER_IOCTL_SELECT:
1822 return snd_timer_user_tselect(file, argp);
1823 case SNDRV_TIMER_IOCTL_INFO:
1824 return snd_timer_user_info(file, argp);
1825 case SNDRV_TIMER_IOCTL_PARAMS:
1826 return snd_timer_user_params(file, argp);
1827 case SNDRV_TIMER_IOCTL_STATUS:
1828 return snd_timer_user_status(file, argp);
1829 case SNDRV_TIMER_IOCTL_START:
1830 case SNDRV_TIMER_IOCTL_START_OLD:
1831 return snd_timer_user_start(file);
1832 case SNDRV_TIMER_IOCTL_STOP:
1833 case SNDRV_TIMER_IOCTL_STOP_OLD:
1834 return snd_timer_user_stop(file);
1835 case SNDRV_TIMER_IOCTL_CONTINUE:
1836 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1837 return snd_timer_user_continue(file);
1838 case SNDRV_TIMER_IOCTL_PAUSE:
1839 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1840 return snd_timer_user_pause(file);
1845 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1847 struct snd_timer_user *tu;
1850 tu = file->private_data;
1851 err = fasync_helper(fd, file, on, &tu->fasync);
1857 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1858 size_t count, loff_t *offset)
1860 struct snd_timer_user *tu;
1861 long result = 0, unit;
1864 tu = file->private_data;
1865 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1866 spin_lock_irq(&tu->qlock);
1867 while ((long)count - result >= unit) {
1868 while (!tu->qused) {
1871 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1876 set_current_state(TASK_INTERRUPTIBLE);
1877 init_waitqueue_entry(&wait, current);
1878 add_wait_queue(&tu->qchange_sleep, &wait);
1880 spin_unlock_irq(&tu->qlock);
1882 spin_lock_irq(&tu->qlock);
1884 remove_wait_queue(&tu->qchange_sleep, &wait);
1886 if (signal_pending(current)) {
1892 spin_unlock_irq(&tu->qlock);
1897 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1898 sizeof(struct snd_timer_tread))) {
1903 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1904 sizeof(struct snd_timer_read))) {
1910 tu->qhead %= tu->queue_size;
1915 spin_lock_irq(&tu->qlock);
1918 spin_unlock_irq(&tu->qlock);
1920 return result > 0 ? result : err;
1923 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1926 struct snd_timer_user *tu;
1928 tu = file->private_data;
1930 poll_wait(file, &tu->qchange_sleep, wait);
1934 mask |= POLLIN | POLLRDNORM;
1939 #ifdef CONFIG_COMPAT
1940 #include "timer_compat.c"
1942 #define snd_timer_user_ioctl_compat NULL
1945 static struct file_operations snd_timer_f_ops =
1947 .owner = THIS_MODULE,
1948 .read = snd_timer_user_read,
1949 .open = snd_timer_user_open,
1950 .release = snd_timer_user_release,
1951 .poll = snd_timer_user_poll,
1952 .unlocked_ioctl = snd_timer_user_ioctl,
1953 .compat_ioctl = snd_timer_user_ioctl_compat,
1954 .fasync = snd_timer_user_fasync,
1961 static int __init alsa_timer_init(void)
1965 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1966 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1970 if ((err = snd_timer_register_system()) < 0)
1971 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1973 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1974 &snd_timer_f_ops, NULL, "timer")) < 0)
1975 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1977 snd_timer_proc_init();
1981 static void __exit alsa_timer_exit(void)
1983 struct list_head *p, *n;
1985 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1986 /* unregister the system timer */
1987 list_for_each_safe(p, n, &snd_timer_list) {
1988 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1989 snd_timer_unregister(timer);
1991 snd_timer_proc_done();
1992 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1993 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1997 module_init(alsa_timer_init)
1998 module_exit(alsa_timer_exit)
2000 EXPORT_SYMBOL(snd_timer_open);
2001 EXPORT_SYMBOL(snd_timer_close);
2002 EXPORT_SYMBOL(snd_timer_resolution);
2003 EXPORT_SYMBOL(snd_timer_start);
2004 EXPORT_SYMBOL(snd_timer_stop);
2005 EXPORT_SYMBOL(snd_timer_continue);
2006 EXPORT_SYMBOL(snd_timer_pause);
2007 EXPORT_SYMBOL(snd_timer_new);
2008 EXPORT_SYMBOL(snd_timer_notify);
2009 EXPORT_SYMBOL(snd_timer_global_new);
2010 EXPORT_SYMBOL(snd_timer_global_free);
2011 EXPORT_SYMBOL(snd_timer_global_register);
2012 EXPORT_SYMBOL(snd_timer_global_unregister);
2013 EXPORT_SYMBOL(snd_timer_interrupt);