2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <linux/module.h>
28 #include <linux/string.h>
29 #include <sound/core.h>
30 #include <sound/timer.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33 #include <sound/minors.h>
34 #include <sound/initval.h>
35 #include <linux/kmod.h>
37 #if defined(CONFIG_SND_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE)
38 #define DEFAULT_TIMER_LIMIT 4
39 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
40 #define DEFAULT_TIMER_LIMIT 2
42 #define DEFAULT_TIMER_LIMIT 1
45 static int timer_limit = DEFAULT_TIMER_LIMIT;
46 static int timer_tstamp_monotonic = 1;
47 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
48 MODULE_DESCRIPTION("ALSA timer interface");
49 MODULE_LICENSE("GPL");
50 module_param(timer_limit, int, 0444);
51 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
52 module_param(timer_tstamp_monotonic, int, 0444);
53 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
55 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
56 MODULE_ALIAS("devname:snd/timer");
58 struct snd_timer_user {
59 struct snd_timer_instance *timeri;
60 int tread; /* enhanced read with timestamps and events */
62 unsigned long overrun;
67 struct snd_timer_read *queue;
68 struct snd_timer_tread *tqueue;
70 unsigned long last_resolution;
72 struct timespec tstamp; /* trigger tstamp */
73 wait_queue_head_t qchange_sleep;
74 struct fasync_struct *fasync;
75 struct mutex ioctl_lock;
79 static LIST_HEAD(snd_timer_list);
81 /* list of slave instances */
82 static LIST_HEAD(snd_timer_slave_list);
84 /* lock for slave active lists */
85 static DEFINE_SPINLOCK(slave_active_lock);
87 static DEFINE_MUTEX(register_mutex);
89 static int snd_timer_free(struct snd_timer *timer);
90 static int snd_timer_dev_free(struct snd_device *device);
91 static int snd_timer_dev_register(struct snd_device *device);
92 static int snd_timer_dev_disconnect(struct snd_device *device);
94 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
97 * create a timer instance with the given owner string.
98 * when timer is not NULL, increments the module counter
100 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
101 struct snd_timer *timer)
103 struct snd_timer_instance *timeri;
104 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
107 timeri->owner = kstrdup(owner, GFP_KERNEL);
108 if (! timeri->owner) {
112 INIT_LIST_HEAD(&timeri->open_list);
113 INIT_LIST_HEAD(&timeri->active_list);
114 INIT_LIST_HEAD(&timeri->ack_list);
115 INIT_LIST_HEAD(&timeri->slave_list_head);
116 INIT_LIST_HEAD(&timeri->slave_active_head);
118 timeri->timer = timer;
119 if (timer && !try_module_get(timer->module)) {
120 kfree(timeri->owner);
129 * find a timer instance from the given timer id
131 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
133 struct snd_timer *timer = NULL;
135 list_for_each_entry(timer, &snd_timer_list, device_list) {
136 if (timer->tmr_class != tid->dev_class)
138 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
139 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
140 (timer->card == NULL ||
141 timer->card->number != tid->card))
143 if (timer->tmr_device != tid->device)
145 if (timer->tmr_subdevice != tid->subdevice)
152 #ifdef CONFIG_MODULES
154 static void snd_timer_request(struct snd_timer_id *tid)
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_move_tail(&slave->open_list,
190 &master->slave_list_head);
191 spin_lock_irq(&slave_active_lock);
192 slave->master = master;
193 slave->timer = master->timer;
194 spin_unlock_irq(&slave_active_lock);
202 * look for slave instances matching with the slave id of the given master.
203 * when found, relink the open_link of slaves.
205 * call this with register_mutex down.
207 static void snd_timer_check_master(struct snd_timer_instance *master)
209 struct snd_timer_instance *slave, *tmp;
211 /* check all pending slaves */
212 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
213 if (slave->slave_class == master->slave_class &&
214 slave->slave_id == master->slave_id) {
215 list_move_tail(&slave->open_list, &master->slave_list_head);
216 spin_lock_irq(&slave_active_lock);
217 spin_lock(&master->timer->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(&master->timer->lock);
224 spin_unlock_irq(&slave_active_lock);
230 * open a timer instance
231 * when opening a master, the slave id must be here given.
233 int snd_timer_open(struct snd_timer_instance **ti,
234 char *owner, struct snd_timer_id *tid,
235 unsigned int slave_id)
237 struct snd_timer *timer;
238 struct snd_timer_instance *timeri = NULL;
240 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
241 /* open a slave instance */
242 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
243 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
244 snd_printd("invalid slave class %i\n", tid->dev_sclass);
247 mutex_lock(®ister_mutex);
248 timeri = snd_timer_instance_new(owner, NULL);
250 mutex_unlock(®ister_mutex);
253 timeri->slave_class = tid->dev_sclass;
254 timeri->slave_id = tid->device;
255 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
256 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
257 snd_timer_check_slave(timeri);
258 mutex_unlock(®ister_mutex);
263 /* open a master instance */
264 mutex_lock(®ister_mutex);
265 timer = snd_timer_find(tid);
266 #ifdef CONFIG_MODULES
268 mutex_unlock(®ister_mutex);
269 snd_timer_request(tid);
270 mutex_lock(®ister_mutex);
271 timer = snd_timer_find(tid);
275 mutex_unlock(®ister_mutex);
278 if (!list_empty(&timer->open_list_head)) {
279 timeri = list_entry(timer->open_list_head.next,
280 struct snd_timer_instance, open_list);
281 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
282 mutex_unlock(®ister_mutex);
286 timeri = snd_timer_instance_new(owner, timer);
288 mutex_unlock(®ister_mutex);
291 timeri->slave_class = tid->dev_sclass;
292 timeri->slave_id = slave_id;
293 if (list_empty(&timer->open_list_head) && timer->hw.open)
294 timer->hw.open(timer);
295 list_add_tail(&timeri->open_list, &timer->open_list_head);
296 snd_timer_check_master(timeri);
297 mutex_unlock(®ister_mutex);
302 static int _snd_timer_stop(struct snd_timer_instance *timeri,
303 int keep_flag, int event);
306 * close a timer instance
308 int snd_timer_close(struct snd_timer_instance *timeri)
310 struct snd_timer *timer = NULL;
311 struct snd_timer_instance *slave, *tmp;
313 if (snd_BUG_ON(!timeri))
316 /* force to stop the timer */
317 snd_timer_stop(timeri);
319 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
320 /* wait, until the active callback is finished */
321 spin_lock_irq(&slave_active_lock);
322 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
323 spin_unlock_irq(&slave_active_lock);
325 spin_lock_irq(&slave_active_lock);
327 spin_unlock_irq(&slave_active_lock);
328 mutex_lock(®ister_mutex);
329 list_del(&timeri->open_list);
330 mutex_unlock(®ister_mutex);
332 timer = timeri->timer;
333 if (snd_BUG_ON(!timer))
335 /* wait, until the active callback is finished */
336 spin_lock_irq(&timer->lock);
337 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
338 spin_unlock_irq(&timer->lock);
340 spin_lock_irq(&timer->lock);
342 spin_unlock_irq(&timer->lock);
343 mutex_lock(®ister_mutex);
344 list_del(&timeri->open_list);
345 if (timer && list_empty(&timer->open_list_head) &&
347 timer->hw.close(timer);
348 /* remove slave links */
349 spin_lock_irq(&slave_active_lock);
350 spin_lock(&timer->lock);
351 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
353 list_move_tail(&slave->open_list, &snd_timer_slave_list);
354 slave->master = NULL;
356 list_del_init(&slave->ack_list);
357 list_del_init(&slave->active_list);
359 spin_unlock(&timer->lock);
360 spin_unlock_irq(&slave_active_lock);
361 mutex_unlock(®ister_mutex);
364 if (timeri->private_free)
365 timeri->private_free(timeri);
366 kfree(timeri->owner);
369 module_put(timer->module);
373 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
375 struct snd_timer * timer;
379 if ((timer = timeri->timer) != NULL) {
380 if (timer->hw.c_resolution)
381 return timer->hw.c_resolution(timer);
382 return timer->hw.resolution;
387 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
389 struct snd_timer *timer;
391 unsigned long resolution = 0;
392 struct snd_timer_instance *ts;
393 struct timespec tstamp;
395 if (timer_tstamp_monotonic)
396 do_posix_clock_monotonic_gettime(&tstamp);
398 getnstimeofday(&tstamp);
399 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
400 event > SNDRV_TIMER_EVENT_PAUSE))
402 if (event == SNDRV_TIMER_EVENT_START ||
403 event == SNDRV_TIMER_EVENT_CONTINUE)
404 resolution = snd_timer_resolution(ti);
406 ti->ccallback(ti, event, &tstamp, resolution);
407 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
412 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
414 spin_lock_irqsave(&timer->lock, flags);
415 list_for_each_entry(ts, &ti->slave_active_head, active_list)
417 ts->ccallback(ts, event + 100, &tstamp, resolution);
418 spin_unlock_irqrestore(&timer->lock, flags);
421 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
422 unsigned long sticks)
424 list_move_tail(&timeri->active_list, &timer->active_list_head);
425 if (timer->running) {
426 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
428 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
429 timeri->flags |= SNDRV_TIMER_IFLG_START;
430 return 1; /* delayed start */
432 timer->sticks = sticks;
433 timer->hw.start(timer);
436 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
441 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
445 spin_lock_irqsave(&slave_active_lock, flags);
446 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
447 spin_unlock_irqrestore(&slave_active_lock, flags);
450 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
451 if (timeri->master && timeri->timer) {
452 spin_lock(&timeri->timer->lock);
453 list_add_tail(&timeri->active_list,
454 &timeri->master->slave_active_head);
455 spin_unlock(&timeri->timer->lock);
457 spin_unlock_irqrestore(&slave_active_lock, flags);
458 return 1; /* delayed start */
462 * start the timer instance
464 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
466 struct snd_timer *timer;
467 int result = -EINVAL;
470 if (timeri == NULL || ticks < 1)
472 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
473 result = snd_timer_start_slave(timeri);
475 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
478 timer = timeri->timer;
481 spin_lock_irqsave(&timer->lock, flags);
482 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
483 SNDRV_TIMER_IFLG_START)) {
487 timeri->ticks = timeri->cticks = ticks;
489 result = snd_timer_start1(timer, timeri, ticks);
491 spin_unlock_irqrestore(&timer->lock, flags);
493 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
497 static int _snd_timer_stop(struct snd_timer_instance * timeri,
498 int keep_flag, int event)
500 struct snd_timer *timer;
503 if (snd_BUG_ON(!timeri))
506 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
508 spin_lock_irqsave(&slave_active_lock, flags);
509 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
510 spin_unlock_irqrestore(&slave_active_lock, flags);
513 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
514 list_del_init(&timeri->ack_list);
515 list_del_init(&timeri->active_list);
516 spin_unlock_irqrestore(&slave_active_lock, flags);
520 timer = timeri->timer;
523 spin_lock_irqsave(&timer->lock, flags);
524 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
525 SNDRV_TIMER_IFLG_START))) {
526 spin_unlock_irqrestore(&timer->lock, flags);
529 list_del_init(&timeri->ack_list);
530 list_del_init(&timeri->active_list);
531 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
532 !(--timer->running)) {
533 timer->hw.stop(timer);
534 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
535 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
536 snd_timer_reschedule(timer, 0);
537 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
538 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
539 timer->hw.start(timer);
545 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
546 spin_unlock_irqrestore(&timer->lock, flags);
548 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
549 snd_timer_notify1(timeri, event);
554 * stop the timer instance.
556 * do not call this from the timer callback!
558 int snd_timer_stop(struct snd_timer_instance *timeri)
560 struct snd_timer *timer;
564 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
567 timer = timeri->timer;
570 spin_lock_irqsave(&timer->lock, flags);
571 timeri->cticks = timeri->ticks;
573 spin_unlock_irqrestore(&timer->lock, flags);
578 * start again.. the tick is kept.
580 int snd_timer_continue(struct snd_timer_instance *timeri)
582 struct snd_timer *timer;
583 int result = -EINVAL;
588 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
589 return snd_timer_start_slave(timeri);
590 timer = timeri->timer;
593 spin_lock_irqsave(&timer->lock, flags);
594 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
601 result = snd_timer_start1(timer, timeri, timer->sticks);
603 spin_unlock_irqrestore(&timer->lock, flags);
604 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
609 * pause.. remember the ticks left
611 int snd_timer_pause(struct snd_timer_instance * timeri)
613 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
617 * reschedule the timer
619 * start pending instances and check the scheduling ticks.
620 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
622 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
624 struct snd_timer_instance *ti;
625 unsigned long ticks = ~0UL;
627 list_for_each_entry(ti, &timer->active_list_head, active_list) {
628 if (ti->flags & SNDRV_TIMER_IFLG_START) {
629 ti->flags &= ~SNDRV_TIMER_IFLG_START;
630 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
633 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
634 if (ticks > ti->cticks)
639 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
642 if (ticks > timer->hw.ticks)
643 ticks = timer->hw.ticks;
644 if (ticks_left != ticks)
645 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
646 timer->sticks = ticks;
653 static void snd_timer_tasklet(unsigned long arg)
655 struct snd_timer *timer = (struct snd_timer *) arg;
656 struct snd_timer_instance *ti;
658 unsigned long resolution, ticks;
661 spin_lock_irqsave(&timer->lock, flags);
662 /* now process all callbacks */
663 while (!list_empty(&timer->sack_list_head)) {
664 p = timer->sack_list_head.next; /* get first item */
665 ti = list_entry(p, struct snd_timer_instance, ack_list);
667 /* remove from ack_list and make empty */
672 resolution = ti->resolution;
674 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
675 spin_unlock(&timer->lock);
677 ti->callback(ti, resolution, ticks);
678 spin_lock(&timer->lock);
679 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
681 spin_unlock_irqrestore(&timer->lock, flags);
687 * ticks_left is usually equal to timer->sticks.
690 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
692 struct snd_timer_instance *ti, *ts, *tmp;
693 unsigned long resolution, ticks;
694 struct list_head *p, *ack_list_head;
701 spin_lock_irqsave(&timer->lock, flags);
703 /* remember the current resolution */
704 if (timer->hw.c_resolution)
705 resolution = timer->hw.c_resolution(timer);
707 resolution = timer->hw.resolution;
709 /* loop for all active instances
710 * Here we cannot use list_for_each_entry because the active_list of a
711 * processed instance is relinked to done_list_head before the callback
714 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
716 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
718 ti->pticks += ticks_left;
719 ti->resolution = resolution;
720 if (ti->cticks < ticks_left)
723 ti->cticks -= ticks_left;
724 if (ti->cticks) /* not expired */
726 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
727 ti->cticks = ti->ticks;
729 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
731 list_del_init(&ti->active_list);
733 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
734 (ti->flags & SNDRV_TIMER_IFLG_FAST))
735 ack_list_head = &timer->ack_list_head;
737 ack_list_head = &timer->sack_list_head;
738 if (list_empty(&ti->ack_list))
739 list_add_tail(&ti->ack_list, ack_list_head);
740 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
741 ts->pticks = ti->pticks;
742 ts->resolution = resolution;
743 if (list_empty(&ts->ack_list))
744 list_add_tail(&ts->ack_list, ack_list_head);
747 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
748 snd_timer_reschedule(timer, timer->sticks);
749 if (timer->running) {
750 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
751 timer->hw.stop(timer);
752 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
754 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
755 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
757 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
758 timer->hw.start(timer);
761 timer->hw.stop(timer);
764 /* now process all fast callbacks */
765 while (!list_empty(&timer->ack_list_head)) {
766 p = timer->ack_list_head.next; /* get first item */
767 ti = list_entry(p, struct snd_timer_instance, ack_list);
769 /* remove from ack_list and make empty */
775 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
776 spin_unlock(&timer->lock);
778 ti->callback(ti, resolution, ticks);
779 spin_lock(&timer->lock);
780 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
783 /* do we have any slow callbacks? */
784 use_tasklet = !list_empty(&timer->sack_list_head);
785 spin_unlock_irqrestore(&timer->lock, flags);
788 tasklet_schedule(&timer->task_queue);
795 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
796 struct snd_timer **rtimer)
798 struct snd_timer *timer;
800 static struct snd_device_ops ops = {
801 .dev_free = snd_timer_dev_free,
802 .dev_register = snd_timer_dev_register,
803 .dev_disconnect = snd_timer_dev_disconnect,
806 if (snd_BUG_ON(!tid))
810 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
812 snd_printk(KERN_ERR "timer: cannot allocate\n");
815 timer->tmr_class = tid->dev_class;
817 timer->tmr_device = tid->device;
818 timer->tmr_subdevice = tid->subdevice;
820 strlcpy(timer->id, id, sizeof(timer->id));
821 INIT_LIST_HEAD(&timer->device_list);
822 INIT_LIST_HEAD(&timer->open_list_head);
823 INIT_LIST_HEAD(&timer->active_list_head);
824 INIT_LIST_HEAD(&timer->ack_list_head);
825 INIT_LIST_HEAD(&timer->sack_list_head);
826 spin_lock_init(&timer->lock);
827 tasklet_init(&timer->task_queue, snd_timer_tasklet,
828 (unsigned long)timer);
830 timer->module = card->module;
831 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
833 snd_timer_free(timer);
842 static int snd_timer_free(struct snd_timer *timer)
847 mutex_lock(®ister_mutex);
848 if (! list_empty(&timer->open_list_head)) {
849 struct list_head *p, *n;
850 struct snd_timer_instance *ti;
851 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
852 list_for_each_safe(p, n, &timer->open_list_head) {
854 ti = list_entry(p, struct snd_timer_instance, open_list);
858 list_del(&timer->device_list);
859 mutex_unlock(®ister_mutex);
861 if (timer->private_free)
862 timer->private_free(timer);
867 static int snd_timer_dev_free(struct snd_device *device)
869 struct snd_timer *timer = device->device_data;
870 return snd_timer_free(timer);
873 static int snd_timer_dev_register(struct snd_device *dev)
875 struct snd_timer *timer = dev->device_data;
876 struct snd_timer *timer1;
878 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
880 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
881 !timer->hw.resolution && timer->hw.c_resolution == NULL)
884 mutex_lock(®ister_mutex);
885 list_for_each_entry(timer1, &snd_timer_list, device_list) {
886 if (timer1->tmr_class > timer->tmr_class)
888 if (timer1->tmr_class < timer->tmr_class)
890 if (timer1->card && timer->card) {
891 if (timer1->card->number > timer->card->number)
893 if (timer1->card->number < timer->card->number)
896 if (timer1->tmr_device > timer->tmr_device)
898 if (timer1->tmr_device < timer->tmr_device)
900 if (timer1->tmr_subdevice > timer->tmr_subdevice)
902 if (timer1->tmr_subdevice < timer->tmr_subdevice)
905 mutex_unlock(®ister_mutex);
908 list_add_tail(&timer->device_list, &timer1->device_list);
909 mutex_unlock(®ister_mutex);
913 static int snd_timer_dev_disconnect(struct snd_device *device)
915 struct snd_timer *timer = device->device_data;
916 mutex_lock(®ister_mutex);
917 list_del_init(&timer->device_list);
918 mutex_unlock(®ister_mutex);
922 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
925 unsigned long resolution = 0;
926 struct snd_timer_instance *ti, *ts;
928 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
930 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
931 event > SNDRV_TIMER_EVENT_MRESUME))
933 spin_lock_irqsave(&timer->lock, flags);
934 if (event == SNDRV_TIMER_EVENT_MSTART ||
935 event == SNDRV_TIMER_EVENT_MCONTINUE ||
936 event == SNDRV_TIMER_EVENT_MRESUME) {
937 if (timer->hw.c_resolution)
938 resolution = timer->hw.c_resolution(timer);
940 resolution = timer->hw.resolution;
942 list_for_each_entry(ti, &timer->active_list_head, active_list) {
944 ti->ccallback(ti, event, tstamp, resolution);
945 list_for_each_entry(ts, &ti->slave_active_head, active_list)
947 ts->ccallback(ts, event, tstamp, resolution);
949 spin_unlock_irqrestore(&timer->lock, flags);
953 * exported functions for global timers
955 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
957 struct snd_timer_id tid;
959 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
960 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
964 return snd_timer_new(NULL, id, &tid, rtimer);
967 int snd_timer_global_free(struct snd_timer *timer)
969 return snd_timer_free(timer);
972 int snd_timer_global_register(struct snd_timer *timer)
974 struct snd_device dev;
976 memset(&dev, 0, sizeof(dev));
977 dev.device_data = timer;
978 return snd_timer_dev_register(&dev);
985 struct snd_timer_system_private {
986 struct timer_list tlist;
987 unsigned long last_expires;
988 unsigned long last_jiffies;
989 unsigned long correction;
992 static void snd_timer_s_function(unsigned long data)
994 struct snd_timer *timer = (struct snd_timer *)data;
995 struct snd_timer_system_private *priv = timer->private_data;
996 unsigned long jiff = jiffies;
997 if (time_after(jiff, priv->last_expires))
998 priv->correction += (long)jiff - (long)priv->last_expires;
999 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1002 static int snd_timer_s_start(struct snd_timer * timer)
1004 struct snd_timer_system_private *priv;
1005 unsigned long njiff;
1007 priv = (struct snd_timer_system_private *) timer->private_data;
1008 njiff = (priv->last_jiffies = jiffies);
1009 if (priv->correction > timer->sticks - 1) {
1010 priv->correction -= timer->sticks - 1;
1013 njiff += timer->sticks - priv->correction;
1014 priv->correction = 0;
1016 priv->last_expires = priv->tlist.expires = njiff;
1017 add_timer(&priv->tlist);
1021 static int snd_timer_s_stop(struct snd_timer * timer)
1023 struct snd_timer_system_private *priv;
1026 priv = (struct snd_timer_system_private *) timer->private_data;
1027 del_timer(&priv->tlist);
1029 if (time_before(jiff, priv->last_expires))
1030 timer->sticks = priv->last_expires - jiff;
1033 priv->correction = 0;
1037 static struct snd_timer_hardware snd_timer_system =
1039 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1040 .resolution = 1000000000L / HZ,
1042 .start = snd_timer_s_start,
1043 .stop = snd_timer_s_stop
1046 static void snd_timer_free_system(struct snd_timer *timer)
1048 kfree(timer->private_data);
1051 static int snd_timer_register_system(void)
1053 struct snd_timer *timer;
1054 struct snd_timer_system_private *priv;
1057 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1060 strcpy(timer->name, "system timer");
1061 timer->hw = snd_timer_system;
1062 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1064 snd_timer_free(timer);
1067 init_timer(&priv->tlist);
1068 priv->tlist.function = snd_timer_s_function;
1069 priv->tlist.data = (unsigned long) timer;
1070 timer->private_data = priv;
1071 timer->private_free = snd_timer_free_system;
1072 return snd_timer_global_register(timer);
1075 #ifdef CONFIG_PROC_FS
1080 static void snd_timer_proc_read(struct snd_info_entry *entry,
1081 struct snd_info_buffer *buffer)
1083 struct snd_timer *timer;
1084 struct snd_timer_instance *ti;
1086 mutex_lock(®ister_mutex);
1087 list_for_each_entry(timer, &snd_timer_list, device_list) {
1088 switch (timer->tmr_class) {
1089 case SNDRV_TIMER_CLASS_GLOBAL:
1090 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1092 case SNDRV_TIMER_CLASS_CARD:
1093 snd_iprintf(buffer, "C%i-%i: ",
1094 timer->card->number, timer->tmr_device);
1096 case SNDRV_TIMER_CLASS_PCM:
1097 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1098 timer->tmr_device, timer->tmr_subdevice);
1101 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1102 timer->card ? timer->card->number : -1,
1103 timer->tmr_device, timer->tmr_subdevice);
1105 snd_iprintf(buffer, "%s :", timer->name);
1106 if (timer->hw.resolution)
1107 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1108 timer->hw.resolution / 1000,
1109 timer->hw.resolution % 1000,
1111 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1112 snd_iprintf(buffer, " SLAVE");
1113 snd_iprintf(buffer, "\n");
1114 list_for_each_entry(ti, &timer->open_list_head, open_list)
1115 snd_iprintf(buffer, " Client %s : %s\n",
1116 ti->owner ? ti->owner : "unknown",
1117 ti->flags & (SNDRV_TIMER_IFLG_START |
1118 SNDRV_TIMER_IFLG_RUNNING)
1119 ? "running" : "stopped");
1121 mutex_unlock(®ister_mutex);
1124 static struct snd_info_entry *snd_timer_proc_entry;
1126 static void __init snd_timer_proc_init(void)
1128 struct snd_info_entry *entry;
1130 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1131 if (entry != NULL) {
1132 entry->c.text.read = snd_timer_proc_read;
1133 if (snd_info_register(entry) < 0) {
1134 snd_info_free_entry(entry);
1138 snd_timer_proc_entry = entry;
1141 static void __exit snd_timer_proc_done(void)
1143 snd_info_free_entry(snd_timer_proc_entry);
1145 #else /* !CONFIG_PROC_FS */
1146 #define snd_timer_proc_init()
1147 #define snd_timer_proc_done()
1151 * USER SPACE interface
1154 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1155 unsigned long resolution,
1156 unsigned long ticks)
1158 struct snd_timer_user *tu = timeri->callback_data;
1159 struct snd_timer_read *r;
1162 spin_lock(&tu->qlock);
1163 if (tu->qused > 0) {
1164 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1165 r = &tu->queue[prev];
1166 if (r->resolution == resolution) {
1171 if (tu->qused >= tu->queue_size) {
1174 r = &tu->queue[tu->qtail++];
1175 tu->qtail %= tu->queue_size;
1176 r->resolution = resolution;
1181 spin_unlock(&tu->qlock);
1182 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1183 wake_up(&tu->qchange_sleep);
1186 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1187 struct snd_timer_tread *tread)
1189 if (tu->qused >= tu->queue_size) {
1192 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1193 tu->qtail %= tu->queue_size;
1198 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1200 struct timespec *tstamp,
1201 unsigned long resolution)
1203 struct snd_timer_user *tu = timeri->callback_data;
1204 struct snd_timer_tread r1;
1205 unsigned long flags;
1207 if (event >= SNDRV_TIMER_EVENT_START &&
1208 event <= SNDRV_TIMER_EVENT_PAUSE)
1209 tu->tstamp = *tstamp;
1210 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1213 r1.tstamp = *tstamp;
1214 r1.val = resolution;
1215 spin_lock_irqsave(&tu->qlock, flags);
1216 snd_timer_user_append_to_tqueue(tu, &r1);
1217 spin_unlock_irqrestore(&tu->qlock, flags);
1218 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1219 wake_up(&tu->qchange_sleep);
1222 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1223 unsigned long resolution,
1224 unsigned long ticks)
1226 struct snd_timer_user *tu = timeri->callback_data;
1227 struct snd_timer_tread *r, r1;
1228 struct timespec tstamp;
1229 int prev, append = 0;
1231 memset(&tstamp, 0, sizeof(tstamp));
1232 spin_lock(&tu->qlock);
1233 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1234 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1235 spin_unlock(&tu->qlock);
1238 if (tu->last_resolution != resolution || ticks > 0) {
1239 if (timer_tstamp_monotonic)
1240 do_posix_clock_monotonic_gettime(&tstamp);
1242 getnstimeofday(&tstamp);
1244 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1245 tu->last_resolution != resolution) {
1246 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1248 r1.val = resolution;
1249 snd_timer_user_append_to_tqueue(tu, &r1);
1250 tu->last_resolution = resolution;
1253 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1257 if (tu->qused > 0) {
1258 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1259 r = &tu->tqueue[prev];
1260 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1267 r1.event = SNDRV_TIMER_EVENT_TICK;
1270 snd_timer_user_append_to_tqueue(tu, &r1);
1273 spin_unlock(&tu->qlock);
1276 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1277 wake_up(&tu->qchange_sleep);
1280 static int snd_timer_user_open(struct inode *inode, struct file *file)
1282 struct snd_timer_user *tu;
1285 err = nonseekable_open(inode, file);
1289 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1292 spin_lock_init(&tu->qlock);
1293 init_waitqueue_head(&tu->qchange_sleep);
1294 mutex_init(&tu->ioctl_lock);
1296 tu->queue_size = 128;
1297 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1299 if (tu->queue == NULL) {
1303 file->private_data = tu;
1307 static int snd_timer_user_release(struct inode *inode, struct file *file)
1309 struct snd_timer_user *tu;
1311 if (file->private_data) {
1312 tu = file->private_data;
1313 file->private_data = NULL;
1314 mutex_lock(&tu->ioctl_lock);
1316 snd_timer_close(tu->timeri);
1317 mutex_unlock(&tu->ioctl_lock);
1325 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1327 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1328 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1334 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1336 id->dev_class = timer->tmr_class;
1337 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1338 id->card = timer->card ? timer->card->number : -1;
1339 id->device = timer->tmr_device;
1340 id->subdevice = timer->tmr_subdevice;
1343 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1345 struct snd_timer_id id;
1346 struct snd_timer *timer;
1347 struct list_head *p;
1349 if (copy_from_user(&id, _tid, sizeof(id)))
1351 mutex_lock(®ister_mutex);
1352 if (id.dev_class < 0) { /* first item */
1353 if (list_empty(&snd_timer_list))
1354 snd_timer_user_zero_id(&id);
1356 timer = list_entry(snd_timer_list.next,
1357 struct snd_timer, device_list);
1358 snd_timer_user_copy_id(&id, timer);
1361 switch (id.dev_class) {
1362 case SNDRV_TIMER_CLASS_GLOBAL:
1363 id.device = id.device < 0 ? 0 : id.device + 1;
1364 list_for_each(p, &snd_timer_list) {
1365 timer = list_entry(p, struct snd_timer, device_list);
1366 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1367 snd_timer_user_copy_id(&id, timer);
1370 if (timer->tmr_device >= id.device) {
1371 snd_timer_user_copy_id(&id, timer);
1375 if (p == &snd_timer_list)
1376 snd_timer_user_zero_id(&id);
1378 case SNDRV_TIMER_CLASS_CARD:
1379 case SNDRV_TIMER_CLASS_PCM:
1386 if (id.device < 0) {
1389 if (id.subdevice < 0) {
1397 list_for_each(p, &snd_timer_list) {
1398 timer = list_entry(p, struct snd_timer, device_list);
1399 if (timer->tmr_class > id.dev_class) {
1400 snd_timer_user_copy_id(&id, timer);
1403 if (timer->tmr_class < id.dev_class)
1405 if (timer->card->number > id.card) {
1406 snd_timer_user_copy_id(&id, timer);
1409 if (timer->card->number < id.card)
1411 if (timer->tmr_device > id.device) {
1412 snd_timer_user_copy_id(&id, timer);
1415 if (timer->tmr_device < id.device)
1417 if (timer->tmr_subdevice > id.subdevice) {
1418 snd_timer_user_copy_id(&id, timer);
1421 if (timer->tmr_subdevice < id.subdevice)
1423 snd_timer_user_copy_id(&id, timer);
1426 if (p == &snd_timer_list)
1427 snd_timer_user_zero_id(&id);
1430 snd_timer_user_zero_id(&id);
1433 mutex_unlock(®ister_mutex);
1434 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1439 static int snd_timer_user_ginfo(struct file *file,
1440 struct snd_timer_ginfo __user *_ginfo)
1442 struct snd_timer_ginfo *ginfo;
1443 struct snd_timer_id tid;
1444 struct snd_timer *t;
1445 struct list_head *p;
1448 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1450 return PTR_ERR(ginfo);
1453 memset(ginfo, 0, sizeof(*ginfo));
1455 mutex_lock(®ister_mutex);
1456 t = snd_timer_find(&tid);
1458 ginfo->card = t->card ? t->card->number : -1;
1459 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1460 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1461 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1462 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1463 ginfo->resolution = t->hw.resolution;
1464 if (t->hw.resolution_min > 0) {
1465 ginfo->resolution_min = t->hw.resolution_min;
1466 ginfo->resolution_max = t->hw.resolution_max;
1468 list_for_each(p, &t->open_list_head) {
1474 mutex_unlock(®ister_mutex);
1475 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1481 static int snd_timer_user_gparams(struct file *file,
1482 struct snd_timer_gparams __user *_gparams)
1484 struct snd_timer_gparams gparams;
1485 struct snd_timer *t;
1488 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1490 mutex_lock(®ister_mutex);
1491 t = snd_timer_find(&gparams.tid);
1496 if (!list_empty(&t->open_list_head)) {
1500 if (!t->hw.set_period) {
1504 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1506 mutex_unlock(®ister_mutex);
1510 static int snd_timer_user_gstatus(struct file *file,
1511 struct snd_timer_gstatus __user *_gstatus)
1513 struct snd_timer_gstatus gstatus;
1514 struct snd_timer_id tid;
1515 struct snd_timer *t;
1518 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1521 memset(&gstatus, 0, sizeof(gstatus));
1523 mutex_lock(®ister_mutex);
1524 t = snd_timer_find(&tid);
1526 if (t->hw.c_resolution)
1527 gstatus.resolution = t->hw.c_resolution(t);
1529 gstatus.resolution = t->hw.resolution;
1530 if (t->hw.precise_resolution) {
1531 t->hw.precise_resolution(t, &gstatus.resolution_num,
1532 &gstatus.resolution_den);
1534 gstatus.resolution_num = gstatus.resolution;
1535 gstatus.resolution_den = 1000000000uL;
1540 mutex_unlock(®ister_mutex);
1541 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1546 static int snd_timer_user_tselect(struct file *file,
1547 struct snd_timer_select __user *_tselect)
1549 struct snd_timer_user *tu;
1550 struct snd_timer_select tselect;
1554 tu = file->private_data;
1556 snd_timer_close(tu->timeri);
1559 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1563 sprintf(str, "application %i", current->pid);
1564 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1565 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1566 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1575 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1577 if (tu->tqueue == NULL)
1580 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1582 if (tu->queue == NULL)
1587 snd_timer_close(tu->timeri);
1590 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1591 tu->timeri->callback = tu->tread
1592 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1593 tu->timeri->ccallback = snd_timer_user_ccallback;
1594 tu->timeri->callback_data = (void *)tu;
1601 static int snd_timer_user_info(struct file *file,
1602 struct snd_timer_info __user *_info)
1604 struct snd_timer_user *tu;
1605 struct snd_timer_info *info;
1606 struct snd_timer *t;
1609 tu = file->private_data;
1612 t = tu->timeri->timer;
1616 info = kzalloc(sizeof(*info), GFP_KERNEL);
1619 info->card = t->card ? t->card->number : -1;
1620 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1621 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1622 strlcpy(info->id, t->id, sizeof(info->id));
1623 strlcpy(info->name, t->name, sizeof(info->name));
1624 info->resolution = t->hw.resolution;
1625 if (copy_to_user(_info, info, sizeof(*_info)))
1631 static int snd_timer_user_params(struct file *file,
1632 struct snd_timer_params __user *_params)
1634 struct snd_timer_user *tu;
1635 struct snd_timer_params params;
1636 struct snd_timer *t;
1637 struct snd_timer_read *tr;
1638 struct snd_timer_tread *ttr;
1641 tu = file->private_data;
1644 t = tu->timeri->timer;
1647 if (copy_from_user(¶ms, _params, sizeof(params)))
1649 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1653 if (params.queue_size > 0 &&
1654 (params.queue_size < 32 || params.queue_size > 1024)) {
1658 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1659 (1<<SNDRV_TIMER_EVENT_TICK)|
1660 (1<<SNDRV_TIMER_EVENT_START)|
1661 (1<<SNDRV_TIMER_EVENT_STOP)|
1662 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1663 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1664 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1665 (1<<SNDRV_TIMER_EVENT_RESUME)|
1666 (1<<SNDRV_TIMER_EVENT_MSTART)|
1667 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1668 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1669 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1670 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1671 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1675 snd_timer_stop(tu->timeri);
1676 spin_lock_irq(&t->lock);
1677 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1678 SNDRV_TIMER_IFLG_EXCLUSIVE|
1679 SNDRV_TIMER_IFLG_EARLY_EVENT);
1680 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1681 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1682 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1683 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1684 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1685 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1686 spin_unlock_irq(&t->lock);
1687 if (params.queue_size > 0 &&
1688 (unsigned int)tu->queue_size != params.queue_size) {
1690 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1694 tu->queue_size = params.queue_size;
1698 tr = kmalloc(params.queue_size * sizeof(*tr),
1702 tu->queue_size = params.queue_size;
1707 tu->qhead = tu->qtail = tu->qused = 0;
1708 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1710 struct snd_timer_tread tread;
1711 tread.event = SNDRV_TIMER_EVENT_EARLY;
1712 tread.tstamp.tv_sec = 0;
1713 tread.tstamp.tv_nsec = 0;
1715 snd_timer_user_append_to_tqueue(tu, &tread);
1717 struct snd_timer_read *r = &tu->queue[0];
1724 tu->filter = params.filter;
1725 tu->ticks = params.ticks;
1728 if (copy_to_user(_params, ¶ms, sizeof(params)))
1733 static int snd_timer_user_status(struct file *file,
1734 struct snd_timer_status __user *_status)
1736 struct snd_timer_user *tu;
1737 struct snd_timer_status status;
1739 tu = file->private_data;
1742 memset(&status, 0, sizeof(status));
1743 status.tstamp = tu->tstamp;
1744 status.resolution = snd_timer_resolution(tu->timeri);
1745 status.lost = tu->timeri->lost;
1746 status.overrun = tu->overrun;
1747 spin_lock_irq(&tu->qlock);
1748 status.queue = tu->qused;
1749 spin_unlock_irq(&tu->qlock);
1750 if (copy_to_user(_status, &status, sizeof(status)))
1755 static int snd_timer_user_start(struct file *file)
1758 struct snd_timer_user *tu;
1760 tu = file->private_data;
1763 snd_timer_stop(tu->timeri);
1764 tu->timeri->lost = 0;
1765 tu->last_resolution = 0;
1766 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1769 static int snd_timer_user_stop(struct file *file)
1772 struct snd_timer_user *tu;
1774 tu = file->private_data;
1777 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1780 static int snd_timer_user_continue(struct file *file)
1783 struct snd_timer_user *tu;
1785 tu = file->private_data;
1788 tu->timeri->lost = 0;
1789 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1792 static int snd_timer_user_pause(struct file *file)
1795 struct snd_timer_user *tu;
1797 tu = file->private_data;
1800 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1804 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1805 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1806 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1807 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1810 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1813 struct snd_timer_user *tu;
1814 void __user *argp = (void __user *)arg;
1815 int __user *p = argp;
1817 tu = file->private_data;
1819 case SNDRV_TIMER_IOCTL_PVERSION:
1820 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1821 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1822 return snd_timer_user_next_device(argp);
1823 case SNDRV_TIMER_IOCTL_TREAD:
1827 if (tu->timeri) /* too late */
1829 if (get_user(xarg, p))
1831 tu->tread = xarg ? 1 : 0;
1834 case SNDRV_TIMER_IOCTL_GINFO:
1835 return snd_timer_user_ginfo(file, argp);
1836 case SNDRV_TIMER_IOCTL_GPARAMS:
1837 return snd_timer_user_gparams(file, argp);
1838 case SNDRV_TIMER_IOCTL_GSTATUS:
1839 return snd_timer_user_gstatus(file, argp);
1840 case SNDRV_TIMER_IOCTL_SELECT:
1841 return snd_timer_user_tselect(file, argp);
1842 case SNDRV_TIMER_IOCTL_INFO:
1843 return snd_timer_user_info(file, argp);
1844 case SNDRV_TIMER_IOCTL_PARAMS:
1845 return snd_timer_user_params(file, argp);
1846 case SNDRV_TIMER_IOCTL_STATUS:
1847 return snd_timer_user_status(file, argp);
1848 case SNDRV_TIMER_IOCTL_START:
1849 case SNDRV_TIMER_IOCTL_START_OLD:
1850 return snd_timer_user_start(file);
1851 case SNDRV_TIMER_IOCTL_STOP:
1852 case SNDRV_TIMER_IOCTL_STOP_OLD:
1853 return snd_timer_user_stop(file);
1854 case SNDRV_TIMER_IOCTL_CONTINUE:
1855 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1856 return snd_timer_user_continue(file);
1857 case SNDRV_TIMER_IOCTL_PAUSE:
1858 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1859 return snd_timer_user_pause(file);
1864 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1867 struct snd_timer_user *tu = file->private_data;
1870 mutex_lock(&tu->ioctl_lock);
1871 ret = __snd_timer_user_ioctl(file, cmd, arg);
1872 mutex_unlock(&tu->ioctl_lock);
1876 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1878 struct snd_timer_user *tu;
1880 tu = file->private_data;
1881 return fasync_helper(fd, file, on, &tu->fasync);
1884 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1885 size_t count, loff_t *offset)
1887 struct snd_timer_user *tu;
1888 long result = 0, unit;
1891 tu = file->private_data;
1892 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1893 spin_lock_irq(&tu->qlock);
1894 while ((long)count - result >= unit) {
1895 while (!tu->qused) {
1898 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1903 set_current_state(TASK_INTERRUPTIBLE);
1904 init_waitqueue_entry(&wait, current);
1905 add_wait_queue(&tu->qchange_sleep, &wait);
1907 spin_unlock_irq(&tu->qlock);
1909 spin_lock_irq(&tu->qlock);
1911 remove_wait_queue(&tu->qchange_sleep, &wait);
1913 if (signal_pending(current)) {
1919 spin_unlock_irq(&tu->qlock);
1924 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1925 sizeof(struct snd_timer_tread))) {
1930 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1931 sizeof(struct snd_timer_read))) {
1937 tu->qhead %= tu->queue_size;
1942 spin_lock_irq(&tu->qlock);
1945 spin_unlock_irq(&tu->qlock);
1947 return result > 0 ? result : err;
1950 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1953 struct snd_timer_user *tu;
1955 tu = file->private_data;
1957 poll_wait(file, &tu->qchange_sleep, wait);
1961 mask |= POLLIN | POLLRDNORM;
1966 #ifdef CONFIG_COMPAT
1967 #include "timer_compat.c"
1969 #define snd_timer_user_ioctl_compat NULL
1972 static const struct file_operations snd_timer_f_ops =
1974 .owner = THIS_MODULE,
1975 .read = snd_timer_user_read,
1976 .open = snd_timer_user_open,
1977 .release = snd_timer_user_release,
1978 .llseek = no_llseek,
1979 .poll = snd_timer_user_poll,
1980 .unlocked_ioctl = snd_timer_user_ioctl,
1981 .compat_ioctl = snd_timer_user_ioctl_compat,
1982 .fasync = snd_timer_user_fasync,
1989 static int __init alsa_timer_init(void)
1993 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1994 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1998 if ((err = snd_timer_register_system()) < 0)
1999 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
2001 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2002 &snd_timer_f_ops, NULL, "timer")) < 0)
2003 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
2005 snd_timer_proc_init();
2009 static void __exit alsa_timer_exit(void)
2011 struct list_head *p, *n;
2013 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
2014 /* unregister the system timer */
2015 list_for_each_safe(p, n, &snd_timer_list) {
2016 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
2017 snd_timer_free(timer);
2019 snd_timer_proc_done();
2020 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2021 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2025 module_init(alsa_timer_init)
2026 module_exit(alsa_timer_exit)
2028 EXPORT_SYMBOL(snd_timer_open);
2029 EXPORT_SYMBOL(snd_timer_close);
2030 EXPORT_SYMBOL(snd_timer_resolution);
2031 EXPORT_SYMBOL(snd_timer_start);
2032 EXPORT_SYMBOL(snd_timer_stop);
2033 EXPORT_SYMBOL(snd_timer_continue);
2034 EXPORT_SYMBOL(snd_timer_pause);
2035 EXPORT_SYMBOL(snd_timer_new);
2036 EXPORT_SYMBOL(snd_timer_notify);
2037 EXPORT_SYMBOL(snd_timer_global_new);
2038 EXPORT_SYMBOL(snd_timer_global_free);
2039 EXPORT_SYMBOL(snd_timer_global_register);
2040 EXPORT_SYMBOL(snd_timer_interrupt);