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/moduleparam.h>
29 #include <linux/string.h>
30 #include <sound/core.h>
31 #include <sound/timer.h>
32 #include <sound/control.h>
33 #include <sound/info.h>
34 #include <sound/minors.h>
35 #include <sound/initval.h>
36 #include <linux/kmod.h>
38 #include <linux/kerneld.h>
41 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
42 #define DEFAULT_TIMER_LIMIT 3
43 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
44 #define DEFAULT_TIMER_LIMIT 2
46 #define DEFAULT_TIMER_LIMIT 1
49 static int timer_limit = DEFAULT_TIMER_LIMIT;
50 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>");
51 MODULE_DESCRIPTION("ALSA timer interface");
52 MODULE_LICENSE("GPL");
53 module_param(timer_limit, int, 0444);
54 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
57 snd_timer_instance_t *timeri;
58 int tread; /* enhanced read with timestamps and events */
60 unsigned long overrun;
65 snd_timer_read_t *queue;
66 snd_timer_tread_t *tqueue;
68 unsigned long last_resolution;
70 struct timespec tstamp; /* trigger tstamp */
71 wait_queue_head_t qchange_sleep;
72 struct fasync_struct *fasync;
73 struct semaphore tread_sem;
77 static LIST_HEAD(snd_timer_list);
79 /* list of slave instances */
80 static LIST_HEAD(snd_timer_slave_list);
82 /* lock for slave active lists */
83 static DEFINE_SPINLOCK(slave_active_lock);
85 static DECLARE_MUTEX(register_mutex);
87 static int snd_timer_free(snd_timer_t *timer);
88 static int snd_timer_dev_free(snd_device_t *device);
89 static int snd_timer_dev_register(snd_device_t *device);
90 static int snd_timer_dev_unregister(snd_device_t *device);
92 static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left);
95 * create a timer instance with the given owner string.
96 * when timer is not NULL, increments the module counter
98 static snd_timer_instance_t *snd_timer_instance_new(char *owner, snd_timer_t *timer)
100 snd_timer_instance_t *timeri;
101 timeri = kcalloc(1, sizeof(*timeri), GFP_KERNEL);
104 timeri->owner = kstrdup(owner, GFP_KERNEL);
105 if (! timeri->owner) {
109 INIT_LIST_HEAD(&timeri->open_list);
110 INIT_LIST_HEAD(&timeri->active_list);
111 INIT_LIST_HEAD(&timeri->ack_list);
112 INIT_LIST_HEAD(&timeri->slave_list_head);
113 INIT_LIST_HEAD(&timeri->slave_active_head);
115 timeri->timer = timer;
116 if (timer && timer->card && !try_module_get(timer->card->module)) {
117 kfree(timeri->owner);
126 * find a timer instance from the given timer id
128 static snd_timer_t *snd_timer_find(snd_timer_id_t *tid)
130 snd_timer_t *timer = NULL;
133 list_for_each(p, &snd_timer_list) {
134 timer = (snd_timer_t *)list_entry(p, snd_timer_t, 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)
154 static void snd_timer_request(snd_timer_id_t *tid)
156 if (! current->fs->root)
158 switch (tid->dev_class) {
159 case SNDRV_TIMER_CLASS_GLOBAL:
160 if (tid->device < timer_limit)
161 request_module("snd-timer-%i", tid->device);
163 case SNDRV_TIMER_CLASS_CARD:
164 case SNDRV_TIMER_CLASS_PCM:
165 if (tid->card < snd_ecards_limit)
166 request_module("snd-card-%i", tid->card);
176 * look for a master instance matching with the slave id of the given slave.
177 * when found, relink the open_link of the slave.
179 * call this with register_mutex down.
181 static void snd_timer_check_slave(snd_timer_instance_t *slave)
184 snd_timer_instance_t *master;
185 struct list_head *p, *q;
187 /* FIXME: it's really dumb to look up all entries.. */
188 list_for_each(p, &snd_timer_list) {
189 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
190 list_for_each(q, &timer->open_list_head) {
191 master = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list);
192 if (slave->slave_class == master->slave_class &&
193 slave->slave_id == master->slave_id) {
194 list_del(&slave->open_list);
195 list_add_tail(&slave->open_list, &master->slave_list_head);
196 spin_lock_irq(&slave_active_lock);
197 slave->master = master;
198 slave->timer = master->timer;
199 spin_unlock_irq(&slave_active_lock);
207 * look for slave instances matching with the slave id of the given master.
208 * when found, relink the open_link of slaves.
210 * call this with register_mutex down.
212 static void snd_timer_check_master(snd_timer_instance_t *master)
214 snd_timer_instance_t *slave;
215 struct list_head *p, *n;
217 /* check all pending slaves */
218 list_for_each_safe(p, n, &snd_timer_slave_list) {
219 slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
220 if (slave->slave_class == master->slave_class &&
221 slave->slave_id == master->slave_id) {
223 list_add_tail(p, &master->slave_list_head);
224 spin_lock_irq(&slave_active_lock);
225 slave->master = master;
226 slave->timer = master->timer;
227 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
228 list_add_tail(&slave->active_list, &master->slave_active_head);
229 spin_unlock_irq(&slave_active_lock);
235 * open a timer instance
236 * when opening a master, the slave id must be here given.
238 int snd_timer_open(snd_timer_instance_t **ti,
239 char *owner, snd_timer_id_t *tid,
240 unsigned int slave_id)
243 snd_timer_instance_t *timeri = NULL;
245 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
246 /* open a slave instance */
247 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
248 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
249 snd_printd("invalid slave class %i\n", tid->dev_sclass);
252 down(®ister_mutex);
253 timeri = snd_timer_instance_new(owner, NULL);
254 timeri->slave_class = tid->dev_sclass;
255 timeri->slave_id = tid->device;
256 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
257 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
258 snd_timer_check_slave(timeri);
264 /* open a master instance */
265 down(®ister_mutex);
266 timer = snd_timer_find(tid);
270 snd_timer_request(tid);
271 down(®ister_mutex);
272 timer = snd_timer_find(tid);
276 if (!list_empty(&timer->open_list_head)) {
277 timeri = (snd_timer_instance_t *)list_entry(timer->open_list_head.next, snd_timer_instance_t, open_list);
278 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
283 timeri = snd_timer_instance_new(owner, timer);
285 timeri->slave_class = tid->dev_sclass;
286 timeri->slave_id = slave_id;
287 if (list_empty(&timer->open_list_head) && timer->hw.open)
288 timer->hw.open(timer);
289 list_add_tail(&timeri->open_list, &timer->open_list_head);
290 snd_timer_check_master(timeri);
301 static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event);
304 * close a timer instance
306 int snd_timer_close(snd_timer_instance_t * timeri)
308 snd_timer_t *timer = NULL;
309 struct list_head *p, *n;
310 snd_timer_instance_t *slave;
312 snd_assert(timeri != NULL, return -ENXIO);
314 /* force to stop the timer */
315 snd_timer_stop(timeri);
317 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
318 /* wait, until the active callback is finished */
319 spin_lock_irq(&slave_active_lock);
320 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
321 spin_unlock_irq(&slave_active_lock);
323 spin_lock_irq(&slave_active_lock);
325 spin_unlock_irq(&slave_active_lock);
326 down(®ister_mutex);
327 list_del(&timeri->open_list);
330 timer = timeri->timer;
331 /* wait, until the active callback is finished */
332 spin_lock_irq(&timer->lock);
333 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
334 spin_unlock_irq(&timer->lock);
336 spin_lock_irq(&timer->lock);
338 spin_unlock_irq(&timer->lock);
339 down(®ister_mutex);
340 list_del(&timeri->open_list);
341 if (timer && list_empty(&timer->open_list_head) && timer->hw.close)
342 timer->hw.close(timer);
343 /* remove slave links */
344 list_for_each_safe(p, n, &timeri->slave_list_head) {
345 slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
346 spin_lock_irq(&slave_active_lock);
347 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
349 list_add_tail(p, &snd_timer_slave_list);
350 slave->master = NULL;
352 spin_unlock_irq(&slave_active_lock);
356 if (timeri->private_free)
357 timeri->private_free(timeri);
358 kfree(timeri->owner);
360 if (timer && timer->card)
361 module_put(timer->card->module);
365 unsigned long snd_timer_resolution(snd_timer_instance_t * timeri)
371 if ((timer = timeri->timer) != NULL) {
372 if (timer->hw.c_resolution)
373 return timer->hw.c_resolution(timer);
374 return timer->hw.resolution;
379 static void snd_timer_notify1(snd_timer_instance_t *ti, enum sndrv_timer_event event)
383 unsigned long resolution = 0;
384 snd_timer_instance_t *ts;
386 struct timespec tstamp;
388 snd_timestamp_now(&tstamp, 1);
389 snd_assert(event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE, return);
390 if (event == SNDRV_TIMER_EVENT_START || event == SNDRV_TIMER_EVENT_CONTINUE)
391 resolution = snd_timer_resolution(ti);
393 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
394 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
399 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
401 spin_lock_irqsave(&timer->lock, flags);
402 list_for_each(n, &ti->slave_active_head) {
403 ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
405 ts->ccallback(ti, event + 100, &tstamp, resolution);
407 spin_unlock_irqrestore(&timer->lock, flags);
410 static int snd_timer_start1(snd_timer_t *timer, snd_timer_instance_t *timeri, unsigned long sticks)
412 list_del(&timeri->active_list);
413 list_add_tail(&timeri->active_list, &timer->active_list_head);
414 if (timer->running) {
415 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
417 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
418 timeri->flags |= SNDRV_TIMER_IFLG_START;
419 return 1; /* delayed start */
421 timer->sticks = sticks;
422 timer->hw.start(timer);
425 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
430 static int snd_timer_start_slave(snd_timer_instance_t *timeri)
434 spin_lock_irqsave(&slave_active_lock, flags);
435 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
437 list_add_tail(&timeri->active_list, &timeri->master->slave_active_head);
438 spin_unlock_irqrestore(&slave_active_lock, flags);
439 return 1; /* delayed start */
443 * start the timer instance
445 int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks)
448 int result = -EINVAL;
451 if (timeri == NULL || ticks < 1)
453 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
454 result = snd_timer_start_slave(timeri);
455 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
458 timer = timeri->timer;
461 spin_lock_irqsave(&timer->lock, flags);
462 timeri->ticks = timeri->cticks = ticks;
464 result = snd_timer_start1(timer, timeri, ticks);
465 spin_unlock_irqrestore(&timer->lock, flags);
466 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
470 static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event)
475 snd_assert(timeri != NULL, return -ENXIO);
477 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
479 spin_lock_irqsave(&slave_active_lock, flags);
480 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
481 spin_unlock_irqrestore(&slave_active_lock, flags);
485 timer = timeri->timer;
488 spin_lock_irqsave(&timer->lock, flags);
489 list_del_init(&timeri->ack_list);
490 list_del_init(&timeri->active_list);
491 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
492 !(--timer->running)) {
493 timer->hw.stop(timer);
494 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
495 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
496 snd_timer_reschedule(timer, 0);
497 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
498 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
499 timer->hw.start(timer);
504 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING|SNDRV_TIMER_IFLG_START);
505 spin_unlock_irqrestore(&timer->lock, flags);
507 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
508 snd_timer_notify1(timeri, event);
513 * stop the timer instance.
515 * do not call this from the timer callback!
517 int snd_timer_stop(snd_timer_instance_t * timeri)
523 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
526 timer = timeri->timer;
527 spin_lock_irqsave(&timer->lock, flags);
528 timeri->cticks = timeri->ticks;
530 spin_unlock_irqrestore(&timer->lock, flags);
535 * start again.. the tick is kept.
537 int snd_timer_continue(snd_timer_instance_t * timeri)
540 int result = -EINVAL;
545 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
546 return snd_timer_start_slave(timeri);
547 timer = timeri->timer;
550 spin_lock_irqsave(&timer->lock, flags);
554 result = snd_timer_start1(timer, timeri, timer->sticks);
555 spin_unlock_irqrestore(&timer->lock, flags);
556 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
561 * pause.. remember the ticks left
563 int snd_timer_pause(snd_timer_instance_t * timeri)
565 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
569 * reschedule the timer
571 * start pending instances and check the scheduling ticks.
572 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
574 static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left)
576 snd_timer_instance_t *ti;
577 unsigned long ticks = ~0UL;
580 list_for_each(p, &timer->active_list_head) {
581 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
582 if (ti->flags & SNDRV_TIMER_IFLG_START) {
583 ti->flags &= ~SNDRV_TIMER_IFLG_START;
584 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
587 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
588 if (ticks > ti->cticks)
593 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
596 if (ticks > timer->hw.ticks)
597 ticks = timer->hw.ticks;
598 if (ticks_left != ticks)
599 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
600 timer->sticks = ticks;
607 static void snd_timer_tasklet(unsigned long arg)
609 snd_timer_t *timer = (snd_timer_t *) arg;
610 snd_timer_instance_t *ti;
612 unsigned long resolution, ticks;
614 spin_lock(&timer->lock);
615 /* now process all callbacks */
616 while (!list_empty(&timer->sack_list_head)) {
617 p = timer->sack_list_head.next; /* get first item */
618 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
620 /* remove from ack_list and make empty */
625 resolution = ti->resolution;
627 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
628 spin_unlock(&timer->lock);
630 ti->callback(ti, resolution, ticks);
631 spin_lock(&timer->lock);
632 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
634 spin_unlock(&timer->lock);
640 * ticks_left is usually equal to timer->sticks.
643 void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left)
645 snd_timer_instance_t *ti, *ts;
646 unsigned long resolution, ticks;
647 struct list_head *p, *q, *n;
653 spin_lock(&timer->lock);
655 /* remember the current resolution */
656 if (timer->hw.c_resolution)
657 resolution = timer->hw.c_resolution(timer);
659 resolution = timer->hw.resolution;
661 /* loop for all active instances
662 * here we cannot use list_for_each because the active_list of a processed
663 * instance is relinked to done_list_head before callback is called.
665 list_for_each_safe(p, n, &timer->active_list_head) {
666 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
667 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
669 ti->pticks += ticks_left;
670 ti->resolution = resolution;
671 if (ti->cticks < ticks_left)
674 ti->cticks -= ticks_left;
675 if (ti->cticks) /* not expired */
677 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
678 ti->cticks = ti->ticks;
680 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
681 if (--timer->running)
684 if (list_empty(&ti->ack_list)) {
685 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
686 (ti->flags & SNDRV_TIMER_IFLG_FAST)) {
687 list_add_tail(&ti->ack_list, &timer->ack_list_head);
689 list_add_tail(&ti->ack_list, &timer->sack_list_head);
692 list_for_each(q, &ti->slave_active_head) {
693 ts = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, active_list);
694 ts->pticks = ti->pticks;
695 ts->resolution = resolution;
696 if (list_empty(&ts->ack_list)) {
697 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
698 (ti->flags & SNDRV_TIMER_IFLG_FAST)) {
699 list_add_tail(&ts->ack_list, &timer->ack_list_head);
701 list_add_tail(&ts->ack_list, &timer->sack_list_head);
706 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
707 snd_timer_reschedule(timer, ticks_left);
708 if (timer->running) {
709 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
710 timer->hw.stop(timer);
711 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
713 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
714 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
716 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
717 timer->hw.start(timer);
720 timer->hw.stop(timer);
723 /* now process all fast callbacks */
724 while (!list_empty(&timer->ack_list_head)) {
725 p = timer->ack_list_head.next; /* get first item */
726 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
728 /* remove from ack_list and make empty */
734 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
735 spin_unlock(&timer->lock);
737 ti->callback(ti, resolution, ticks);
738 spin_lock(&timer->lock);
739 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
742 /* do we have any slow callbacks? */
743 use_tasklet = !list_empty(&timer->sack_list_head);
744 spin_unlock(&timer->lock);
747 tasklet_hi_schedule(&timer->task_queue);
754 int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t ** rtimer)
758 static snd_device_ops_t ops = {
759 .dev_free = snd_timer_dev_free,
760 .dev_register = snd_timer_dev_register,
761 .dev_unregister = snd_timer_dev_unregister
764 snd_assert(tid != NULL, return -EINVAL);
765 snd_assert(rtimer != NULL, return -EINVAL);
767 timer = kcalloc(1, sizeof(*timer), GFP_KERNEL);
770 timer->tmr_class = tid->dev_class;
772 timer->tmr_device = tid->device;
773 timer->tmr_subdevice = tid->subdevice;
775 strlcpy(timer->id, id, sizeof(timer->id));
776 INIT_LIST_HEAD(&timer->device_list);
777 INIT_LIST_HEAD(&timer->open_list_head);
778 INIT_LIST_HEAD(&timer->active_list_head);
779 INIT_LIST_HEAD(&timer->ack_list_head);
780 INIT_LIST_HEAD(&timer->sack_list_head);
781 spin_lock_init(&timer->lock);
782 tasklet_init(&timer->task_queue, snd_timer_tasklet, (unsigned long)timer);
784 if ((err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops)) < 0) {
785 snd_timer_free(timer);
793 static int snd_timer_free(snd_timer_t *timer)
795 snd_assert(timer != NULL, return -ENXIO);
796 if (timer->private_free)
797 timer->private_free(timer);
802 int snd_timer_dev_free(snd_device_t *device)
804 snd_timer_t *timer = device->device_data;
805 return snd_timer_free(timer);
808 int snd_timer_dev_register(snd_device_t *dev)
810 snd_timer_t *timer = dev->device_data;
814 snd_assert(timer != NULL && timer->hw.start != NULL && timer->hw.stop != NULL, return -ENXIO);
815 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
816 !timer->hw.resolution && timer->hw.c_resolution == NULL)
819 down(®ister_mutex);
820 list_for_each(p, &snd_timer_list) {
821 timer1 = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
822 if (timer1->tmr_class > timer->tmr_class)
824 if (timer1->tmr_class < timer->tmr_class)
826 if (timer1->card && timer->card) {
827 if (timer1->card->number > timer->card->number)
829 if (timer1->card->number < timer->card->number)
832 if (timer1->tmr_device > timer->tmr_device)
834 if (timer1->tmr_device < timer->tmr_device)
836 if (timer1->tmr_subdevice > timer->tmr_subdevice)
838 if (timer1->tmr_subdevice < timer->tmr_subdevice)
844 list_add_tail(&timer->device_list, p);
849 static int snd_timer_unregister(snd_timer_t *timer)
851 struct list_head *p, *n;
852 snd_timer_instance_t *ti;
854 snd_assert(timer != NULL, return -ENXIO);
855 down(®ister_mutex);
856 if (! list_empty(&timer->open_list_head)) {
857 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer);
858 list_for_each_safe(p, n, &timer->open_list_head) {
860 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
864 list_del(&timer->device_list);
866 return snd_timer_free(timer);
869 static int snd_timer_dev_unregister(snd_device_t *device)
871 snd_timer_t *timer = device->device_data;
872 return snd_timer_unregister(timer);
875 void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, struct timespec *tstamp)
878 unsigned long resolution = 0;
879 snd_timer_instance_t *ti, *ts;
880 struct list_head *p, *n;
882 snd_runtime_check(timer->hw.flags & SNDRV_TIMER_HW_SLAVE, return);
883 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && event <= SNDRV_TIMER_EVENT_MPAUSE, return);
884 spin_lock_irqsave(&timer->lock, flags);
885 if (event == SNDRV_TIMER_EVENT_MSTART || event == SNDRV_TIMER_EVENT_MCONTINUE) {
886 if (timer->hw.c_resolution)
887 resolution = timer->hw.c_resolution(timer);
889 resolution = timer->hw.resolution;
891 list_for_each(p, &timer->active_list_head) {
892 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
894 ti->ccallback(ti, event, tstamp, resolution);
895 list_for_each(n, &ti->slave_active_head) {
896 ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
898 ts->ccallback(ts, event, tstamp, resolution);
901 spin_unlock_irqrestore(&timer->lock, flags);
905 * exported functions for global timers
907 int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer)
911 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
912 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
916 return snd_timer_new(NULL, id, &tid, rtimer);
919 int snd_timer_global_free(snd_timer_t *timer)
921 return snd_timer_free(timer);
924 int snd_timer_global_register(snd_timer_t *timer)
928 memset(&dev, 0, sizeof(dev));
929 dev.device_data = timer;
930 return snd_timer_dev_register(&dev);
933 int snd_timer_global_unregister(snd_timer_t *timer)
935 return snd_timer_unregister(timer);
942 struct snd_timer_system_private {
943 struct timer_list tlist;
944 struct timer * timer;
945 unsigned long last_expires;
946 unsigned long last_jiffies;
947 unsigned long correction;
950 static void snd_timer_s_function(unsigned long data)
952 snd_timer_t *timer = (snd_timer_t *)data;
953 struct snd_timer_system_private *priv = timer->private_data;
954 unsigned long jiff = jiffies;
955 if (time_after(jiff, priv->last_expires))
956 priv->correction = (long)jiff - (long)priv->last_expires;
957 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
960 static int snd_timer_s_start(snd_timer_t * timer)
962 struct snd_timer_system_private *priv;
965 priv = (struct snd_timer_system_private *) timer->private_data;
966 njiff = (priv->last_jiffies = jiffies);
967 if (priv->correction > timer->sticks - 1) {
968 priv->correction -= timer->sticks - 1;
971 njiff += timer->sticks - priv->correction;
972 priv->correction -= timer->sticks;
974 priv->last_expires = priv->tlist.expires = njiff;
975 add_timer(&priv->tlist);
979 static int snd_timer_s_stop(snd_timer_t * timer)
981 struct snd_timer_system_private *priv;
984 priv = (struct snd_timer_system_private *) timer->private_data;
985 del_timer(&priv->tlist);
987 if (time_before(jiff, priv->last_expires))
988 timer->sticks = priv->last_expires - jiff;
994 static struct _snd_timer_hardware snd_timer_system =
996 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
997 .resolution = 1000000000L / HZ,
999 .start = snd_timer_s_start,
1000 .stop = snd_timer_s_stop
1003 static void snd_timer_free_system(snd_timer_t *timer)
1005 kfree(timer->private_data);
1008 static int snd_timer_register_system(void)
1011 struct snd_timer_system_private *priv;
1014 if ((err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer)) < 0)
1016 strcpy(timer->name, "system timer");
1017 timer->hw = snd_timer_system;
1018 priv = kcalloc(1, sizeof(*priv), GFP_KERNEL);
1020 snd_timer_free(timer);
1023 init_timer(&priv->tlist);
1024 priv->tlist.function = snd_timer_s_function;
1025 priv->tlist.data = (unsigned long) timer;
1026 timer->private_data = priv;
1027 timer->private_free = snd_timer_free_system;
1028 return snd_timer_global_register(timer);
1035 static void snd_timer_proc_read(snd_info_entry_t *entry,
1036 snd_info_buffer_t * buffer)
1038 unsigned long flags;
1040 snd_timer_instance_t *ti;
1041 struct list_head *p, *q;
1043 down(®ister_mutex);
1044 list_for_each(p, &snd_timer_list) {
1045 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1046 switch (timer->tmr_class) {
1047 case SNDRV_TIMER_CLASS_GLOBAL:
1048 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1050 case SNDRV_TIMER_CLASS_CARD:
1051 snd_iprintf(buffer, "C%i-%i: ", timer->card->number, timer->tmr_device);
1053 case SNDRV_TIMER_CLASS_PCM:
1054 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, timer->tmr_device, timer->tmr_subdevice);
1057 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, timer->card ? timer->card->number : -1, timer->tmr_device, timer->tmr_subdevice);
1059 snd_iprintf(buffer, "%s :", timer->name);
1060 if (timer->hw.resolution)
1061 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", timer->hw.resolution / 1000, timer->hw.resolution % 1000, timer->hw.ticks);
1062 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1063 snd_iprintf(buffer, " SLAVE");
1064 snd_iprintf(buffer, "\n");
1065 spin_lock_irqsave(&timer->lock, flags);
1066 list_for_each(q, &timer->open_list_head) {
1067 ti = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list);
1068 snd_iprintf(buffer, " Client %s : %s : lost interrupts %li\n",
1069 ti->owner ? ti->owner : "unknown",
1070 ti->flags & (SNDRV_TIMER_IFLG_START|SNDRV_TIMER_IFLG_RUNNING) ? "running" : "stopped",
1073 spin_unlock_irqrestore(&timer->lock, flags);
1075 up(®ister_mutex);
1079 * USER SPACE interface
1082 static void snd_timer_user_interrupt(snd_timer_instance_t *timeri,
1083 unsigned long resolution,
1084 unsigned long ticks)
1086 snd_timer_user_t *tu = timeri->callback_data;
1087 snd_timer_read_t *r;
1090 spin_lock(&tu->qlock);
1091 if (tu->qused > 0) {
1092 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1093 r = &tu->queue[prev];
1094 if (r->resolution == resolution) {
1099 if (tu->qused >= tu->queue_size) {
1102 r = &tu->queue[tu->qtail++];
1103 tu->qtail %= tu->queue_size;
1104 r->resolution = resolution;
1109 spin_unlock(&tu->qlock);
1110 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1111 wake_up(&tu->qchange_sleep);
1114 static void snd_timer_user_append_to_tqueue(snd_timer_user_t *tu, snd_timer_tread_t *tread)
1116 if (tu->qused >= tu->queue_size) {
1119 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1120 tu->qtail %= tu->queue_size;
1125 static void snd_timer_user_ccallback(snd_timer_instance_t *timeri,
1126 enum sndrv_timer_event event,
1127 struct timespec *tstamp,
1128 unsigned long resolution)
1130 snd_timer_user_t *tu = timeri->callback_data;
1131 snd_timer_tread_t r1;
1133 if (event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE)
1134 tu->tstamp = *tstamp;
1135 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1138 r1.tstamp = *tstamp;
1139 r1.val = resolution;
1140 spin_lock(&tu->qlock);
1141 snd_timer_user_append_to_tqueue(tu, &r1);
1142 spin_unlock(&tu->qlock);
1143 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1144 wake_up(&tu->qchange_sleep);
1147 static void snd_timer_user_tinterrupt(snd_timer_instance_t *timeri,
1148 unsigned long resolution,
1149 unsigned long ticks)
1151 snd_timer_user_t *tu = timeri->callback_data;
1152 snd_timer_tread_t *r, r1;
1153 struct timespec tstamp;
1154 int prev, append = 0;
1156 snd_timestamp_zero(&tstamp);
1157 spin_lock(&tu->qlock);
1158 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION)|(1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1159 spin_unlock(&tu->qlock);
1162 if (tu->last_resolution != resolution || ticks > 0)
1163 snd_timestamp_now(&tstamp, 1);
1164 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && tu->last_resolution != resolution) {
1165 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1167 r1.val = resolution;
1168 snd_timer_user_append_to_tqueue(tu, &r1);
1169 tu->last_resolution = resolution;
1172 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1176 if (tu->qused > 0) {
1177 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1178 r = &tu->tqueue[prev];
1179 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1186 r1.event = SNDRV_TIMER_EVENT_TICK;
1189 snd_timer_user_append_to_tqueue(tu, &r1);
1192 spin_unlock(&tu->qlock);
1195 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1196 wake_up(&tu->qchange_sleep);
1199 static int snd_timer_user_open(struct inode *inode, struct file *file)
1201 snd_timer_user_t *tu;
1203 tu = kcalloc(1, sizeof(*tu), GFP_KERNEL);
1206 spin_lock_init(&tu->qlock);
1207 init_waitqueue_head(&tu->qchange_sleep);
1208 init_MUTEX(&tu->tread_sem);
1210 tu->queue_size = 128;
1211 tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1212 if (tu->queue == NULL) {
1216 file->private_data = tu;
1220 static int snd_timer_user_release(struct inode *inode, struct file *file)
1222 snd_timer_user_t *tu;
1224 if (file->private_data) {
1225 tu = file->private_data;
1226 file->private_data = NULL;
1227 fasync_helper(-1, file, 0, &tu->fasync);
1229 snd_timer_close(tu->timeri);
1237 static void snd_timer_user_zero_id(snd_timer_id_t *id)
1239 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1240 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1246 static void snd_timer_user_copy_id(snd_timer_id_t *id, snd_timer_t *timer)
1248 id->dev_class = timer->tmr_class;
1249 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1250 id->card = timer->card ? timer->card->number : -1;
1251 id->device = timer->tmr_device;
1252 id->subdevice = timer->tmr_subdevice;
1255 static int snd_timer_user_next_device(snd_timer_id_t __user *_tid)
1259 struct list_head *p;
1261 if (copy_from_user(&id, _tid, sizeof(id)))
1263 down(®ister_mutex);
1264 if (id.dev_class < 0) { /* first item */
1265 if (list_empty(&snd_timer_list))
1266 snd_timer_user_zero_id(&id);
1268 timer = (snd_timer_t *)list_entry(snd_timer_list.next, snd_timer_t, device_list);
1269 snd_timer_user_copy_id(&id, timer);
1272 switch (id.dev_class) {
1273 case SNDRV_TIMER_CLASS_GLOBAL:
1274 id.device = id.device < 0 ? 0 : id.device + 1;
1275 list_for_each(p, &snd_timer_list) {
1276 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1277 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1278 snd_timer_user_copy_id(&id, timer);
1281 if (timer->tmr_device >= id.device) {
1282 snd_timer_user_copy_id(&id, timer);
1286 if (p == &snd_timer_list)
1287 snd_timer_user_zero_id(&id);
1289 case SNDRV_TIMER_CLASS_CARD:
1290 case SNDRV_TIMER_CLASS_PCM:
1297 if (id.device < 0) {
1300 id.subdevice = id.subdevice < 0 ? 0 : id.subdevice + 1;
1304 list_for_each(p, &snd_timer_list) {
1305 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1306 if (timer->tmr_class > id.dev_class) {
1307 snd_timer_user_copy_id(&id, timer);
1310 if (timer->tmr_class < id.dev_class)
1312 if (timer->card->number > id.card) {
1313 snd_timer_user_copy_id(&id, timer);
1316 if (timer->card->number < id.card)
1318 if (timer->tmr_device > id.device) {
1319 snd_timer_user_copy_id(&id, timer);
1322 if (timer->tmr_device < id.device)
1324 if (timer->tmr_subdevice > id.subdevice) {
1325 snd_timer_user_copy_id(&id, timer);
1328 if (timer->tmr_subdevice < id.subdevice)
1330 snd_timer_user_copy_id(&id, timer);
1333 if (p == &snd_timer_list)
1334 snd_timer_user_zero_id(&id);
1337 snd_timer_user_zero_id(&id);
1340 up(®ister_mutex);
1341 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1346 static int snd_timer_user_ginfo(struct file *file, snd_timer_ginfo_t __user *_ginfo)
1348 snd_timer_ginfo_t *ginfo;
1351 struct list_head *p;
1354 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1357 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1362 memset(ginfo, 0, sizeof(*ginfo));
1364 down(®ister_mutex);
1365 t = snd_timer_find(&tid);
1367 ginfo->card = t->card ? t->card->number : -1;
1368 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1369 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1370 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1371 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1372 ginfo->resolution = t->hw.resolution;
1373 if (t->hw.resolution_min > 0) {
1374 ginfo->resolution_min = t->hw.resolution_min;
1375 ginfo->resolution_max = t->hw.resolution_max;
1377 list_for_each(p, &t->open_list_head) {
1383 up(®ister_mutex);
1384 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1390 static int snd_timer_user_gparams(struct file *file, snd_timer_gparams_t __user *_gparams)
1392 snd_timer_gparams_t gparams;
1396 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1398 down(®ister_mutex);
1399 t = snd_timer_find(&gparams.tid);
1401 if (list_empty(&t->open_list_head)) {
1402 if (t->hw.set_period)
1403 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1412 up(®ister_mutex);
1416 static int snd_timer_user_gstatus(struct file *file, snd_timer_gstatus_t __user *_gstatus)
1418 snd_timer_gstatus_t gstatus;
1423 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1426 memset(&gstatus, 0, sizeof(gstatus));
1428 down(®ister_mutex);
1429 t = snd_timer_find(&tid);
1431 if (t->hw.c_resolution)
1432 gstatus.resolution = t->hw.c_resolution(t);
1434 gstatus.resolution = t->hw.resolution;
1435 if (t->hw.precise_resolution) {
1436 t->hw.precise_resolution(t, &gstatus.resolution_num, &gstatus.resolution_den);
1438 gstatus.resolution_num = gstatus.resolution;
1439 gstatus.resolution_den = 1000000000uL;
1444 up(®ister_mutex);
1445 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1450 static int snd_timer_user_tselect(struct file *file, snd_timer_select_t __user *_tselect)
1452 snd_timer_user_t *tu;
1453 snd_timer_select_t tselect;
1457 tu = file->private_data;
1458 down(&tu->tread_sem);
1460 snd_timer_close(tu->timeri);
1463 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1467 sprintf(str, "application %i", current->pid);
1468 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1469 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1470 if ((err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid)) < 0)
1478 tu->tqueue = (snd_timer_tread_t *)kmalloc(tu->queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
1479 if (tu->tqueue == NULL)
1482 tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1483 if (tu->queue == NULL)
1488 snd_timer_close(tu->timeri);
1491 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1492 tu->timeri->callback = tu->tread ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1493 tu->timeri->ccallback = snd_timer_user_ccallback;
1494 tu->timeri->callback_data = (void *)tu;
1502 static int snd_timer_user_info(struct file *file, snd_timer_info_t __user *_info)
1504 snd_timer_user_t *tu;
1505 snd_timer_info_t *info;
1509 tu = file->private_data;
1510 snd_assert(tu->timeri != NULL, return -ENXIO);
1511 t = tu->timeri->timer;
1512 snd_assert(t != NULL, return -ENXIO);
1514 info = kcalloc(1, sizeof(*info), GFP_KERNEL);
1517 info->card = t->card ? t->card->number : -1;
1518 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1519 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1520 strlcpy(info->id, t->id, sizeof(info->id));
1521 strlcpy(info->name, t->name, sizeof(info->name));
1522 info->resolution = t->hw.resolution;
1523 if (copy_to_user(_info, info, sizeof(*_info)))
1529 static int snd_timer_user_params(struct file *file, snd_timer_params_t __user *_params)
1531 snd_timer_user_t *tu;
1532 snd_timer_params_t params;
1534 snd_timer_read_t *tr;
1535 snd_timer_tread_t *ttr;
1538 tu = file->private_data;
1539 snd_assert(tu->timeri != NULL, return -ENXIO);
1540 t = tu->timeri->timer;
1541 snd_assert(t != NULL, return -ENXIO);
1542 if (copy_from_user(¶ms, _params, sizeof(params)))
1544 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1548 if (params.queue_size > 0 && (params.queue_size < 32 || params.queue_size > 1024)) {
1552 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1553 (1<<SNDRV_TIMER_EVENT_TICK)|
1554 (1<<SNDRV_TIMER_EVENT_START)|
1555 (1<<SNDRV_TIMER_EVENT_STOP)|
1556 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1557 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1558 (1<<SNDRV_TIMER_EVENT_MSTART)|
1559 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1560 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1561 (1<<SNDRV_TIMER_EVENT_MPAUSE))) {
1565 snd_timer_stop(tu->timeri);
1566 spin_lock_irq(&t->lock);
1567 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1568 SNDRV_TIMER_IFLG_EXCLUSIVE|
1569 SNDRV_TIMER_IFLG_EARLY_EVENT);
1570 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1571 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1572 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1573 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1574 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1575 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1576 spin_unlock_irq(&t->lock);
1577 if (params.queue_size > 0 && (unsigned int)tu->queue_size != params.queue_size) {
1579 ttr = (snd_timer_tread_t *)kmalloc(params.queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
1582 tu->queue_size = params.queue_size;
1586 tr = (snd_timer_read_t *)kmalloc(params.queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1589 tu->queue_size = params.queue_size;
1594 tu->qhead = tu->qtail = tu->qused = 0;
1595 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1597 snd_timer_tread_t tread;
1598 tread.event = SNDRV_TIMER_EVENT_EARLY;
1599 tread.tstamp.tv_sec = 0;
1600 tread.tstamp.tv_nsec = 0;
1602 snd_timer_user_append_to_tqueue(tu, &tread);
1604 snd_timer_read_t *r = &tu->queue[0];
1612 tu->filter = params.filter;
1613 tu->ticks = params.ticks;
1616 if (copy_to_user(_params, ¶ms, sizeof(params)))
1621 static int snd_timer_user_status(struct file *file, snd_timer_status_t __user *_status)
1623 snd_timer_user_t *tu;
1624 snd_timer_status_t status;
1626 tu = file->private_data;
1627 snd_assert(tu->timeri != NULL, return -ENXIO);
1628 memset(&status, 0, sizeof(status));
1629 status.tstamp = tu->tstamp;
1630 status.resolution = snd_timer_resolution(tu->timeri);
1631 status.lost = tu->timeri->lost;
1632 status.overrun = tu->overrun;
1633 spin_lock_irq(&tu->qlock);
1634 status.queue = tu->qused;
1635 spin_unlock_irq(&tu->qlock);
1636 if (copy_to_user(_status, &status, sizeof(status)))
1641 static int snd_timer_user_start(struct file *file)
1644 snd_timer_user_t *tu;
1646 tu = file->private_data;
1647 snd_assert(tu->timeri != NULL, return -ENXIO);
1648 snd_timer_stop(tu->timeri);
1649 tu->timeri->lost = 0;
1650 tu->last_resolution = 0;
1651 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1654 static int snd_timer_user_stop(struct file *file)
1657 snd_timer_user_t *tu;
1659 tu = file->private_data;
1660 snd_assert(tu->timeri != NULL, return -ENXIO);
1661 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1664 static int snd_timer_user_continue(struct file *file)
1667 snd_timer_user_t *tu;
1669 tu = file->private_data;
1670 snd_assert(tu->timeri != NULL, return -ENXIO);
1671 tu->timeri->lost = 0;
1672 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1675 static int snd_timer_user_pause(struct file *file)
1678 snd_timer_user_t *tu;
1680 tu = file->private_data;
1681 snd_assert(tu->timeri != NULL, return -ENXIO);
1682 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1686 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1687 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1688 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1689 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1692 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1694 snd_timer_user_t *tu;
1695 void __user *argp = (void __user *)arg;
1696 int __user *p = argp;
1698 tu = file->private_data;
1700 case SNDRV_TIMER_IOCTL_PVERSION:
1701 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1702 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1703 return snd_timer_user_next_device(argp);
1704 case SNDRV_TIMER_IOCTL_TREAD:
1708 down(&tu->tread_sem);
1709 if (tu->timeri) { /* too late */
1713 if (get_user(xarg, p)) {
1717 tu->tread = xarg ? 1 : 0;
1721 case SNDRV_TIMER_IOCTL_GINFO:
1722 return snd_timer_user_ginfo(file, argp);
1723 case SNDRV_TIMER_IOCTL_GPARAMS:
1724 return snd_timer_user_gparams(file, argp);
1725 case SNDRV_TIMER_IOCTL_GSTATUS:
1726 return snd_timer_user_gstatus(file, argp);
1727 case SNDRV_TIMER_IOCTL_SELECT:
1728 return snd_timer_user_tselect(file, argp);
1729 case SNDRV_TIMER_IOCTL_INFO:
1730 return snd_timer_user_info(file, argp);
1731 case SNDRV_TIMER_IOCTL_PARAMS:
1732 return snd_timer_user_params(file, argp);
1733 case SNDRV_TIMER_IOCTL_STATUS:
1734 return snd_timer_user_status(file, argp);
1735 case SNDRV_TIMER_IOCTL_START:
1736 case SNDRV_TIMER_IOCTL_START_OLD:
1737 return snd_timer_user_start(file);
1738 case SNDRV_TIMER_IOCTL_STOP:
1739 case SNDRV_TIMER_IOCTL_STOP_OLD:
1740 return snd_timer_user_stop(file);
1741 case SNDRV_TIMER_IOCTL_CONTINUE:
1742 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1743 return snd_timer_user_continue(file);
1744 case SNDRV_TIMER_IOCTL_PAUSE:
1745 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1746 return snd_timer_user_pause(file);
1751 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1753 snd_timer_user_t *tu;
1756 tu = file->private_data;
1757 err = fasync_helper(fd, file, on, &tu->fasync);
1763 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
1765 snd_timer_user_t *tu;
1766 long result = 0, unit;
1769 tu = file->private_data;
1770 unit = tu->tread ? sizeof(snd_timer_tread_t) : sizeof(snd_timer_read_t);
1771 spin_lock_irq(&tu->qlock);
1772 while ((long)count - result >= unit) {
1773 while (!tu->qused) {
1776 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1781 set_current_state(TASK_INTERRUPTIBLE);
1782 init_waitqueue_entry(&wait, current);
1783 add_wait_queue(&tu->qchange_sleep, &wait);
1785 spin_unlock_irq(&tu->qlock);
1787 spin_lock_irq(&tu->qlock);
1789 remove_wait_queue(&tu->qchange_sleep, &wait);
1791 if (signal_pending(current)) {
1797 spin_unlock_irq(&tu->qlock);
1802 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], sizeof(snd_timer_tread_t))) {
1807 if (copy_to_user(buffer, &tu->queue[tu->qhead++], sizeof(snd_timer_read_t))) {
1813 tu->qhead %= tu->queue_size;
1818 spin_lock_irq(&tu->qlock);
1821 spin_unlock_irq(&tu->qlock);
1823 return result > 0 ? result : err;
1826 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1829 snd_timer_user_t *tu;
1831 tu = file->private_data;
1833 poll_wait(file, &tu->qchange_sleep, wait);
1837 mask |= POLLIN | POLLRDNORM;
1842 #ifdef CONFIG_COMPAT
1843 #include "timer_compat.c"
1845 #define snd_timer_user_ioctl_compat NULL
1848 static struct file_operations snd_timer_f_ops =
1850 .owner = THIS_MODULE,
1851 .read = snd_timer_user_read,
1852 .open = snd_timer_user_open,
1853 .release = snd_timer_user_release,
1854 .poll = snd_timer_user_poll,
1855 .unlocked_ioctl = snd_timer_user_ioctl,
1856 .compat_ioctl = snd_timer_user_ioctl_compat,
1857 .fasync = snd_timer_user_fasync,
1860 static snd_minor_t snd_timer_reg =
1863 .f_ops = &snd_timer_f_ops,
1870 static snd_info_entry_t *snd_timer_proc_entry = NULL;
1872 static int __init alsa_timer_init(void)
1875 snd_info_entry_t *entry;
1877 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1878 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, "system timer");
1880 if ((entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL)) != NULL) {
1881 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128;
1882 entry->c.text.read = snd_timer_proc_read;
1883 if (snd_info_register(entry) < 0) {
1884 snd_info_free_entry(entry);
1888 snd_timer_proc_entry = entry;
1889 if ((err = snd_timer_register_system()) < 0)
1890 snd_printk(KERN_ERR "unable to register system timer (%i)\n", err);
1891 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER,
1892 NULL, 0, &snd_timer_reg, "timer"))<0)
1893 snd_printk(KERN_ERR "unable to register timer device (%i)\n", err);
1897 static void __exit alsa_timer_exit(void)
1899 struct list_head *p, *n;
1901 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1902 /* unregister the system timer */
1903 list_for_each_safe(p, n, &snd_timer_list) {
1904 snd_timer_t *timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1905 snd_timer_unregister(timer);
1907 if (snd_timer_proc_entry) {
1908 snd_info_unregister(snd_timer_proc_entry);
1909 snd_timer_proc_entry = NULL;
1911 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1912 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1916 module_init(alsa_timer_init)
1917 module_exit(alsa_timer_exit)
1919 EXPORT_SYMBOL(snd_timer_open);
1920 EXPORT_SYMBOL(snd_timer_close);
1921 EXPORT_SYMBOL(snd_timer_resolution);
1922 EXPORT_SYMBOL(snd_timer_start);
1923 EXPORT_SYMBOL(snd_timer_stop);
1924 EXPORT_SYMBOL(snd_timer_continue);
1925 EXPORT_SYMBOL(snd_timer_pause);
1926 EXPORT_SYMBOL(snd_timer_new);
1927 EXPORT_SYMBOL(snd_timer_notify);
1928 EXPORT_SYMBOL(snd_timer_global_new);
1929 EXPORT_SYMBOL(snd_timer_global_free);
1930 EXPORT_SYMBOL(snd_timer_global_register);
1931 EXPORT_SYMBOL(snd_timer_global_unregister);
1932 EXPORT_SYMBOL(snd_timer_interrupt);