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 <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 #include <linux/kerneld.h>
40 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
41 #define DEFAULT_TIMER_LIMIT 3
42 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
43 #define DEFAULT_TIMER_LIMIT 2
45 #define DEFAULT_TIMER_LIMIT 1
48 static int timer_limit = DEFAULT_TIMER_LIMIT;
49 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>");
50 MODULE_DESCRIPTION("ALSA timer interface");
51 MODULE_LICENSE("GPL");
52 module_param(timer_limit, int, 0444);
53 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
56 snd_timer_instance_t *timeri;
57 int tread; /* enhanced read with timestamps and events */
59 unsigned long overrun;
64 snd_timer_read_t *queue;
65 snd_timer_tread_t *tqueue;
67 unsigned long last_resolution;
69 struct timespec tstamp; /* trigger tstamp */
70 wait_queue_head_t qchange_sleep;
71 struct fasync_struct *fasync;
72 struct semaphore tread_sem;
76 static LIST_HEAD(snd_timer_list);
78 /* list of slave instances */
79 static LIST_HEAD(snd_timer_slave_list);
81 /* lock for slave active lists */
82 static DEFINE_SPINLOCK(slave_active_lock);
84 static DECLARE_MUTEX(register_mutex);
86 static int snd_timer_free(snd_timer_t *timer);
87 static int snd_timer_dev_free(snd_device_t *device);
88 static int snd_timer_dev_register(snd_device_t *device);
89 static int snd_timer_dev_unregister(snd_device_t *device);
91 static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left);
94 * create a timer instance with the given owner string.
95 * when timer is not NULL, increments the module counter
97 static snd_timer_instance_t *snd_timer_instance_new(char *owner, snd_timer_t *timer)
99 snd_timer_instance_t *timeri;
100 timeri = kcalloc(1, sizeof(*timeri), GFP_KERNEL);
103 timeri->owner = snd_kmalloc_strdup(owner, GFP_KERNEL);
104 if (! timeri->owner) {
108 INIT_LIST_HEAD(&timeri->open_list);
109 INIT_LIST_HEAD(&timeri->active_list);
110 INIT_LIST_HEAD(&timeri->ack_list);
111 INIT_LIST_HEAD(&timeri->slave_list_head);
112 INIT_LIST_HEAD(&timeri->slave_active_head);
114 timeri->timer = timer;
115 if (timer && timer->card && !try_module_get(timer->card->module)) {
116 kfree(timeri->owner);
125 * find a timer instance from the given timer id
127 static snd_timer_t *snd_timer_find(snd_timer_id_t *tid)
129 snd_timer_t *timer = NULL;
132 list_for_each(p, &snd_timer_list) {
133 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
135 if (timer->tmr_class != tid->dev_class)
137 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
138 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
139 (timer->card == NULL ||
140 timer->card->number != tid->card))
142 if (timer->tmr_device != tid->device)
144 if (timer->tmr_subdevice != tid->subdevice)
153 static void snd_timer_request(snd_timer_id_t *tid)
155 if (! current->fs->root)
157 switch (tid->dev_class) {
158 case SNDRV_TIMER_CLASS_GLOBAL:
159 if (tid->device < timer_limit)
160 request_module("snd-timer-%i", tid->device);
162 case SNDRV_TIMER_CLASS_CARD:
163 case SNDRV_TIMER_CLASS_PCM:
164 if (tid->card < snd_ecards_limit)
165 request_module("snd-card-%i", tid->card);
175 * look for a master instance matching with the slave id of the given slave.
176 * when found, relink the open_link of the slave.
178 * call this with register_mutex down.
180 static void snd_timer_check_slave(snd_timer_instance_t *slave)
183 snd_timer_instance_t *master;
184 struct list_head *p, *q;
186 /* FIXME: it's really dumb to look up all entries.. */
187 list_for_each(p, &snd_timer_list) {
188 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
189 list_for_each(q, &timer->open_list_head) {
190 master = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list);
191 if (slave->slave_class == master->slave_class &&
192 slave->slave_id == master->slave_id) {
193 list_del(&slave->open_list);
194 list_add_tail(&slave->open_list, &master->slave_list_head);
195 spin_lock_irq(&slave_active_lock);
196 slave->master = master;
197 slave->timer = master->timer;
198 spin_unlock_irq(&slave_active_lock);
206 * look for slave instances matching with the slave id of the given master.
207 * when found, relink the open_link of slaves.
209 * call this with register_mutex down.
211 static void snd_timer_check_master(snd_timer_instance_t *master)
213 snd_timer_instance_t *slave;
214 struct list_head *p, *n;
216 /* check all pending slaves */
217 list_for_each_safe(p, n, &snd_timer_slave_list) {
218 slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
219 if (slave->slave_class == master->slave_class &&
220 slave->slave_id == master->slave_id) {
222 list_add_tail(p, &master->slave_list_head);
223 spin_lock_irq(&slave_active_lock);
224 slave->master = master;
225 slave->timer = master->timer;
226 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
227 list_add_tail(&slave->active_list, &master->slave_active_head);
228 spin_unlock_irq(&slave_active_lock);
234 * open a timer instance
235 * when opening a master, the slave id must be here given.
237 int snd_timer_open(snd_timer_instance_t **ti,
238 char *owner, snd_timer_id_t *tid,
239 unsigned int slave_id)
242 snd_timer_instance_t *timeri = NULL;
244 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
245 /* open a slave instance */
246 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
247 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
248 snd_printd("invalid slave class %i\n", tid->dev_sclass);
251 down(®ister_mutex);
252 timeri = snd_timer_instance_new(owner, NULL);
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);
263 /* open a master instance */
264 down(®ister_mutex);
265 timer = snd_timer_find(tid);
269 snd_timer_request(tid);
270 down(®ister_mutex);
271 timer = snd_timer_find(tid);
275 if (!list_empty(&timer->open_list_head)) {
276 timeri = (snd_timer_instance_t *)list_entry(timer->open_list_head.next, snd_timer_instance_t, open_list);
277 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
282 timeri = snd_timer_instance_new(owner, timer);
284 timeri->slave_class = tid->dev_sclass;
285 timeri->slave_id = slave_id;
286 if (list_empty(&timer->open_list_head) && timer->hw.open)
287 timer->hw.open(timer);
288 list_add_tail(&timeri->open_list, &timer->open_list_head);
289 snd_timer_check_master(timeri);
300 static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event);
303 * close a timer instance
305 int snd_timer_close(snd_timer_instance_t * timeri)
307 snd_timer_t *timer = NULL;
308 struct list_head *p, *n;
309 snd_timer_instance_t *slave;
311 snd_assert(timeri != NULL, return -ENXIO);
313 /* force to stop the timer */
314 snd_timer_stop(timeri);
316 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
317 /* wait, until the active callback is finished */
318 spin_lock_irq(&slave_active_lock);
319 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
320 spin_unlock_irq(&slave_active_lock);
322 spin_lock_irq(&slave_active_lock);
324 spin_unlock_irq(&slave_active_lock);
325 down(®ister_mutex);
326 list_del(&timeri->open_list);
329 timer = timeri->timer;
330 /* wait, until the active callback is finished */
331 spin_lock_irq(&timer->lock);
332 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
333 spin_unlock_irq(&timer->lock);
335 spin_lock_irq(&timer->lock);
337 spin_unlock_irq(&timer->lock);
338 down(®ister_mutex);
339 list_del(&timeri->open_list);
340 if (timer && list_empty(&timer->open_list_head) && timer->hw.close)
341 timer->hw.close(timer);
342 /* remove slave links */
343 list_for_each_safe(p, n, &timeri->slave_list_head) {
344 slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
345 spin_lock_irq(&slave_active_lock);
346 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
348 list_add_tail(p, &snd_timer_slave_list);
349 slave->master = NULL;
351 spin_unlock_irq(&slave_active_lock);
355 if (timeri->private_free)
356 timeri->private_free(timeri);
357 kfree(timeri->owner);
359 if (timer && timer->card)
360 module_put(timer->card->module);
364 unsigned long snd_timer_resolution(snd_timer_instance_t * timeri)
370 if ((timer = timeri->timer) != NULL) {
371 if (timer->hw.c_resolution)
372 return timer->hw.c_resolution(timer);
373 return timer->hw.resolution;
378 static void snd_timer_notify1(snd_timer_instance_t *ti, enum sndrv_timer_event event)
382 unsigned long resolution = 0;
383 snd_timer_instance_t *ts;
385 struct timespec tstamp;
387 snd_timestamp_now(&tstamp, 1);
388 snd_assert(event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE, return);
389 if (event == SNDRV_TIMER_EVENT_START || event == SNDRV_TIMER_EVENT_CONTINUE)
390 resolution = snd_timer_resolution(ti);
392 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
393 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
398 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
400 spin_lock_irqsave(&timer->lock, flags);
401 list_for_each(n, &ti->slave_active_head) {
402 ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
404 ts->ccallback(ti, event + 100, &tstamp, resolution);
406 spin_unlock_irqrestore(&timer->lock, flags);
409 static int snd_timer_start1(snd_timer_t *timer, snd_timer_instance_t *timeri, unsigned long sticks)
411 list_del(&timeri->active_list);
412 list_add_tail(&timeri->active_list, &timer->active_list_head);
413 if (timer->running) {
414 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
416 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
417 timeri->flags |= SNDRV_TIMER_IFLG_START;
418 return 1; /* delayed start */
420 timer->sticks = sticks;
421 timer->hw.start(timer);
424 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
429 static int snd_timer_start_slave(snd_timer_instance_t *timeri)
433 spin_lock_irqsave(&slave_active_lock, flags);
434 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
436 list_add_tail(&timeri->active_list, &timeri->master->slave_active_head);
437 spin_unlock_irqrestore(&slave_active_lock, flags);
438 return 1; /* delayed start */
442 * start the timer instance
444 int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks)
447 int result = -EINVAL;
450 if (timeri == NULL || ticks < 1)
452 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
453 result = snd_timer_start_slave(timeri);
454 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
457 timer = timeri->timer;
460 spin_lock_irqsave(&timer->lock, flags);
461 timeri->ticks = timeri->cticks = ticks;
463 result = snd_timer_start1(timer, timeri, ticks);
464 spin_unlock_irqrestore(&timer->lock, flags);
465 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
469 static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event)
474 snd_assert(timeri != NULL, return -ENXIO);
476 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
478 spin_lock_irqsave(&slave_active_lock, flags);
479 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
480 spin_unlock_irqrestore(&slave_active_lock, flags);
484 timer = timeri->timer;
487 spin_lock_irqsave(&timer->lock, flags);
488 list_del_init(&timeri->ack_list);
489 list_del_init(&timeri->active_list);
490 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
491 !(--timer->running)) {
492 timer->hw.stop(timer);
493 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
494 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
495 snd_timer_reschedule(timer, 0);
496 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
497 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
498 timer->hw.start(timer);
503 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING|SNDRV_TIMER_IFLG_START);
504 spin_unlock_irqrestore(&timer->lock, flags);
506 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
507 snd_timer_notify1(timeri, event);
512 * stop the timer instance.
514 * do not call this from the timer callback!
516 int snd_timer_stop(snd_timer_instance_t * timeri)
522 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
525 timer = timeri->timer;
526 spin_lock_irqsave(&timer->lock, flags);
527 timeri->cticks = timeri->ticks;
529 spin_unlock_irqrestore(&timer->lock, flags);
534 * start again.. the tick is kept.
536 int snd_timer_continue(snd_timer_instance_t * timeri)
539 int result = -EINVAL;
544 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
545 return snd_timer_start_slave(timeri);
546 timer = timeri->timer;
549 spin_lock_irqsave(&timer->lock, flags);
553 result = snd_timer_start1(timer, timeri, timer->sticks);
554 spin_unlock_irqrestore(&timer->lock, flags);
555 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
560 * pause.. remember the ticks left
562 int snd_timer_pause(snd_timer_instance_t * timeri)
564 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
568 * reschedule the timer
570 * start pending instances and check the scheduling ticks.
571 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
573 static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left)
575 snd_timer_instance_t *ti;
576 unsigned long ticks = ~0UL;
579 list_for_each(p, &timer->active_list_head) {
580 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
581 if (ti->flags & SNDRV_TIMER_IFLG_START) {
582 ti->flags &= ~SNDRV_TIMER_IFLG_START;
583 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
586 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
587 if (ticks > ti->cticks)
592 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
595 if (ticks > timer->hw.ticks)
596 ticks = timer->hw.ticks;
597 if (ticks_left != ticks)
598 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
599 timer->sticks = ticks;
606 static void snd_timer_tasklet(unsigned long arg)
608 snd_timer_t *timer = (snd_timer_t *) arg;
609 snd_timer_instance_t *ti;
611 unsigned long resolution, ticks;
613 spin_lock(&timer->lock);
614 /* now process all callbacks */
615 while (!list_empty(&timer->sack_list_head)) {
616 p = timer->sack_list_head.next; /* get first item */
617 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
619 /* remove from ack_list and make empty */
624 resolution = ti->resolution;
626 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
627 spin_unlock(&timer->lock);
629 ti->callback(ti, resolution, ticks);
630 spin_lock(&timer->lock);
631 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
633 spin_unlock(&timer->lock);
639 * ticks_left is usually equal to timer->sticks.
642 void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left)
644 snd_timer_instance_t *ti, *ts;
645 unsigned long resolution, ticks;
646 struct list_head *p, *q, *n;
652 spin_lock(&timer->lock);
654 /* remember the current resolution */
655 if (timer->hw.c_resolution)
656 resolution = timer->hw.c_resolution(timer);
658 resolution = timer->hw.resolution;
660 /* loop for all active instances
661 * here we cannot use list_for_each because the active_list of a processed
662 * instance is relinked to done_list_head before callback is called.
664 list_for_each_safe(p, n, &timer->active_list_head) {
665 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
666 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
668 ti->pticks += ticks_left;
669 ti->resolution = resolution;
670 if (ti->cticks < ticks_left)
673 ti->cticks -= ticks_left;
674 if (ti->cticks) /* not expired */
676 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
677 ti->cticks = ti->ticks;
679 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
680 if (--timer->running)
683 if (list_empty(&ti->ack_list)) {
684 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
685 (ti->flags & SNDRV_TIMER_IFLG_FAST)) {
686 list_add_tail(&ti->ack_list, &timer->ack_list_head);
688 list_add_tail(&ti->ack_list, &timer->sack_list_head);
691 list_for_each(q, &ti->slave_active_head) {
692 ts = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, active_list);
693 ts->pticks = ti->pticks;
694 ts->resolution = resolution;
695 if (list_empty(&ts->ack_list)) {
696 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
697 (ti->flags & SNDRV_TIMER_IFLG_FAST)) {
698 list_add_tail(&ts->ack_list, &timer->ack_list_head);
700 list_add_tail(&ts->ack_list, &timer->sack_list_head);
705 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
706 snd_timer_reschedule(timer, ticks_left);
707 if (timer->running) {
708 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
709 timer->hw.stop(timer);
710 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
712 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
713 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
715 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
716 timer->hw.start(timer);
719 timer->hw.stop(timer);
722 /* now process all fast callbacks */
723 while (!list_empty(&timer->ack_list_head)) {
724 p = timer->ack_list_head.next; /* get first item */
725 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
727 /* remove from ack_list and make empty */
733 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
734 spin_unlock(&timer->lock);
736 ti->callback(ti, resolution, ticks);
737 spin_lock(&timer->lock);
738 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
741 /* do we have any slow callbacks? */
742 use_tasklet = !list_empty(&timer->sack_list_head);
743 spin_unlock(&timer->lock);
746 tasklet_hi_schedule(&timer->task_queue);
753 int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t ** rtimer)
757 static snd_device_ops_t ops = {
758 .dev_free = snd_timer_dev_free,
759 .dev_register = snd_timer_dev_register,
760 .dev_unregister = snd_timer_dev_unregister
763 snd_assert(tid != NULL, return -EINVAL);
764 snd_assert(rtimer != NULL, return -EINVAL);
766 timer = kcalloc(1, sizeof(*timer), GFP_KERNEL);
769 timer->tmr_class = tid->dev_class;
771 timer->tmr_device = tid->device;
772 timer->tmr_subdevice = tid->subdevice;
774 strlcpy(timer->id, id, sizeof(timer->id));
775 INIT_LIST_HEAD(&timer->device_list);
776 INIT_LIST_HEAD(&timer->open_list_head);
777 INIT_LIST_HEAD(&timer->active_list_head);
778 INIT_LIST_HEAD(&timer->ack_list_head);
779 INIT_LIST_HEAD(&timer->sack_list_head);
780 spin_lock_init(&timer->lock);
781 tasklet_init(&timer->task_queue, snd_timer_tasklet, (unsigned long)timer);
783 if ((err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops)) < 0) {
784 snd_timer_free(timer);
792 static int snd_timer_free(snd_timer_t *timer)
794 snd_assert(timer != NULL, return -ENXIO);
795 if (timer->private_free)
796 timer->private_free(timer);
801 int snd_timer_dev_free(snd_device_t *device)
803 snd_timer_t *timer = device->device_data;
804 return snd_timer_free(timer);
807 int snd_timer_dev_register(snd_device_t *dev)
809 snd_timer_t *timer = dev->device_data;
813 snd_assert(timer != NULL && timer->hw.start != NULL && timer->hw.stop != NULL, return -ENXIO);
814 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
815 !timer->hw.resolution && timer->hw.c_resolution == NULL)
818 down(®ister_mutex);
819 list_for_each(p, &snd_timer_list) {
820 timer1 = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
821 if (timer1->tmr_class > timer->tmr_class)
823 if (timer1->tmr_class < timer->tmr_class)
825 if (timer1->card && timer->card) {
826 if (timer1->card->number > timer->card->number)
828 if (timer1->card->number < timer->card->number)
831 if (timer1->tmr_device > timer->tmr_device)
833 if (timer1->tmr_device < timer->tmr_device)
835 if (timer1->tmr_subdevice > timer->tmr_subdevice)
837 if (timer1->tmr_subdevice < timer->tmr_subdevice)
843 list_add_tail(&timer->device_list, p);
848 int snd_timer_unregister(snd_timer_t *timer)
850 struct list_head *p, *n;
851 snd_timer_instance_t *ti;
853 snd_assert(timer != NULL, return -ENXIO);
854 down(®ister_mutex);
855 if (! list_empty(&timer->open_list_head)) {
856 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer);
857 list_for_each_safe(p, n, &timer->open_list_head) {
859 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
863 list_del(&timer->device_list);
865 return snd_timer_free(timer);
868 static int snd_timer_dev_unregister(snd_device_t *device)
870 snd_timer_t *timer = device->device_data;
871 return snd_timer_unregister(timer);
874 void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, struct timespec *tstamp)
877 unsigned long resolution = 0;
878 snd_timer_instance_t *ti, *ts;
879 struct list_head *p, *n;
881 snd_runtime_check(timer->hw.flags & SNDRV_TIMER_HW_SLAVE, return);
882 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && event <= SNDRV_TIMER_EVENT_MPAUSE, return);
883 spin_lock_irqsave(&timer->lock, flags);
884 if (event == SNDRV_TIMER_EVENT_MSTART || event == SNDRV_TIMER_EVENT_MCONTINUE) {
885 if (timer->hw.c_resolution)
886 resolution = timer->hw.c_resolution(timer);
888 resolution = timer->hw.resolution;
890 list_for_each(p, &timer->active_list_head) {
891 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
893 ti->ccallback(ti, event, tstamp, resolution);
894 list_for_each(n, &ti->slave_active_head) {
895 ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
897 ts->ccallback(ts, event, tstamp, resolution);
900 spin_unlock_irqrestore(&timer->lock, flags);
904 * exported functions for global timers
906 int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer)
910 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
911 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
915 return snd_timer_new(NULL, id, &tid, rtimer);
918 int snd_timer_global_free(snd_timer_t *timer)
920 return snd_timer_free(timer);
923 int snd_timer_global_register(snd_timer_t *timer)
927 memset(&dev, 0, sizeof(dev));
928 dev.device_data = timer;
929 return snd_timer_dev_register(&dev);
932 int snd_timer_global_unregister(snd_timer_t *timer)
934 return snd_timer_unregister(timer);
941 struct snd_timer_system_private {
942 struct timer_list tlist;
943 struct timer * timer;
944 unsigned long last_expires;
945 unsigned long last_jiffies;
946 unsigned long correction;
949 unsigned int snd_timer_system_resolution(void)
951 return 1000000000L / HZ;
954 static void snd_timer_s_function(unsigned long data)
956 snd_timer_t *timer = (snd_timer_t *)data;
957 struct snd_timer_system_private *priv = timer->private_data;
958 unsigned long jiff = jiffies;
959 if (time_after(jiff, priv->last_expires))
960 priv->correction = (long)jiff - (long)priv->last_expires;
961 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
964 static int snd_timer_s_start(snd_timer_t * timer)
966 struct snd_timer_system_private *priv;
969 priv = (struct snd_timer_system_private *) timer->private_data;
970 njiff = (priv->last_jiffies = jiffies);
971 if (priv->correction > timer->sticks - 1) {
972 priv->correction -= timer->sticks - 1;
975 njiff += timer->sticks - priv->correction;
976 priv->correction -= timer->sticks;
978 priv->last_expires = priv->tlist.expires = njiff;
979 add_timer(&priv->tlist);
983 static int snd_timer_s_stop(snd_timer_t * timer)
985 struct snd_timer_system_private *priv;
988 priv = (struct snd_timer_system_private *) timer->private_data;
989 del_timer(&priv->tlist);
991 if (time_before(jiff, priv->last_expires))
992 timer->sticks = priv->last_expires - jiff;
998 static struct _snd_timer_hardware snd_timer_system =
1000 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1001 .resolution = 1000000000L / HZ,
1003 .start = snd_timer_s_start,
1004 .stop = snd_timer_s_stop
1007 static void snd_timer_free_system(snd_timer_t *timer)
1009 kfree(timer->private_data);
1012 static int snd_timer_register_system(void)
1015 struct snd_timer_system_private *priv;
1018 if ((err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer)) < 0)
1020 strcpy(timer->name, "system timer");
1021 timer->hw = snd_timer_system;
1022 priv = kcalloc(1, sizeof(*priv), GFP_KERNEL);
1024 snd_timer_free(timer);
1027 init_timer(&priv->tlist);
1028 priv->tlist.function = snd_timer_s_function;
1029 priv->tlist.data = (unsigned long) timer;
1030 timer->private_data = priv;
1031 timer->private_free = snd_timer_free_system;
1032 return snd_timer_global_register(timer);
1039 static void snd_timer_proc_read(snd_info_entry_t *entry,
1040 snd_info_buffer_t * buffer)
1042 unsigned long flags;
1044 snd_timer_instance_t *ti;
1045 struct list_head *p, *q;
1047 down(®ister_mutex);
1048 list_for_each(p, &snd_timer_list) {
1049 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1050 switch (timer->tmr_class) {
1051 case SNDRV_TIMER_CLASS_GLOBAL:
1052 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1054 case SNDRV_TIMER_CLASS_CARD:
1055 snd_iprintf(buffer, "C%i-%i: ", timer->card->number, timer->tmr_device);
1057 case SNDRV_TIMER_CLASS_PCM:
1058 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, timer->tmr_device, timer->tmr_subdevice);
1061 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, timer->card ? timer->card->number : -1, timer->tmr_device, timer->tmr_subdevice);
1063 snd_iprintf(buffer, "%s :", timer->name);
1064 if (timer->hw.resolution)
1065 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", timer->hw.resolution / 1000, timer->hw.resolution % 1000, timer->hw.ticks);
1066 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1067 snd_iprintf(buffer, " SLAVE");
1068 snd_iprintf(buffer, "\n");
1069 spin_lock_irqsave(&timer->lock, flags);
1070 list_for_each(q, &timer->open_list_head) {
1071 ti = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list);
1072 snd_iprintf(buffer, " Client %s : %s : lost interrupts %li\n",
1073 ti->owner ? ti->owner : "unknown",
1074 ti->flags & (SNDRV_TIMER_IFLG_START|SNDRV_TIMER_IFLG_RUNNING) ? "running" : "stopped",
1077 spin_unlock_irqrestore(&timer->lock, flags);
1079 up(®ister_mutex);
1083 * USER SPACE interface
1086 static void snd_timer_user_interrupt(snd_timer_instance_t *timeri,
1087 unsigned long resolution,
1088 unsigned long ticks)
1090 snd_timer_user_t *tu = timeri->callback_data;
1091 snd_timer_read_t *r;
1094 spin_lock(&tu->qlock);
1095 if (tu->qused > 0) {
1096 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1097 r = &tu->queue[prev];
1098 if (r->resolution == resolution) {
1103 if (tu->qused >= tu->queue_size) {
1106 r = &tu->queue[tu->qtail++];
1107 tu->qtail %= tu->queue_size;
1108 r->resolution = resolution;
1113 spin_unlock(&tu->qlock);
1114 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1115 wake_up(&tu->qchange_sleep);
1118 static void snd_timer_user_append_to_tqueue(snd_timer_user_t *tu, snd_timer_tread_t *tread)
1120 if (tu->qused >= tu->queue_size) {
1123 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1124 tu->qtail %= tu->queue_size;
1129 static void snd_timer_user_ccallback(snd_timer_instance_t *timeri,
1130 enum sndrv_timer_event event,
1131 struct timespec *tstamp,
1132 unsigned long resolution)
1134 snd_timer_user_t *tu = timeri->callback_data;
1135 snd_timer_tread_t r1;
1137 if (event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE)
1138 tu->tstamp = *tstamp;
1139 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1142 r1.tstamp = *tstamp;
1143 r1.val = resolution;
1144 spin_lock(&tu->qlock);
1145 snd_timer_user_append_to_tqueue(tu, &r1);
1146 spin_unlock(&tu->qlock);
1147 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1148 wake_up(&tu->qchange_sleep);
1151 static void snd_timer_user_tinterrupt(snd_timer_instance_t *timeri,
1152 unsigned long resolution,
1153 unsigned long ticks)
1155 snd_timer_user_t *tu = timeri->callback_data;
1156 snd_timer_tread_t *r, r1;
1157 struct timespec tstamp;
1158 int prev, append = 0;
1160 snd_timestamp_zero(&tstamp);
1161 spin_lock(&tu->qlock);
1162 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION)|(1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1163 spin_unlock(&tu->qlock);
1166 if (tu->last_resolution != resolution || ticks > 0)
1167 snd_timestamp_now(&tstamp, 1);
1168 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && tu->last_resolution != resolution) {
1169 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1171 r1.val = resolution;
1172 snd_timer_user_append_to_tqueue(tu, &r1);
1173 tu->last_resolution = resolution;
1176 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1180 if (tu->qused > 0) {
1181 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1182 r = &tu->tqueue[prev];
1183 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1190 r1.event = SNDRV_TIMER_EVENT_TICK;
1193 snd_timer_user_append_to_tqueue(tu, &r1);
1196 spin_unlock(&tu->qlock);
1199 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1200 wake_up(&tu->qchange_sleep);
1203 static int snd_timer_user_open(struct inode *inode, struct file *file)
1205 snd_timer_user_t *tu;
1207 tu = kcalloc(1, sizeof(*tu), GFP_KERNEL);
1210 spin_lock_init(&tu->qlock);
1211 init_waitqueue_head(&tu->qchange_sleep);
1212 init_MUTEX(&tu->tread_sem);
1214 tu->queue_size = 128;
1215 tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1216 if (tu->queue == NULL) {
1220 file->private_data = tu;
1224 static int snd_timer_user_release(struct inode *inode, struct file *file)
1226 snd_timer_user_t *tu;
1228 if (file->private_data) {
1229 tu = file->private_data;
1230 file->private_data = NULL;
1231 fasync_helper(-1, file, 0, &tu->fasync);
1233 snd_timer_close(tu->timeri);
1241 static void snd_timer_user_zero_id(snd_timer_id_t *id)
1243 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1244 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1250 static void snd_timer_user_copy_id(snd_timer_id_t *id, snd_timer_t *timer)
1252 id->dev_class = timer->tmr_class;
1253 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1254 id->card = timer->card ? timer->card->number : -1;
1255 id->device = timer->tmr_device;
1256 id->subdevice = timer->tmr_subdevice;
1259 static int snd_timer_user_next_device(snd_timer_id_t __user *_tid)
1263 struct list_head *p;
1265 if (copy_from_user(&id, _tid, sizeof(id)))
1267 down(®ister_mutex);
1268 if (id.dev_class < 0) { /* first item */
1269 if (list_empty(&snd_timer_list))
1270 snd_timer_user_zero_id(&id);
1272 timer = (snd_timer_t *)list_entry(snd_timer_list.next, snd_timer_t, device_list);
1273 snd_timer_user_copy_id(&id, timer);
1276 switch (id.dev_class) {
1277 case SNDRV_TIMER_CLASS_GLOBAL:
1278 id.device = id.device < 0 ? 0 : id.device + 1;
1279 list_for_each(p, &snd_timer_list) {
1280 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1281 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1282 snd_timer_user_copy_id(&id, timer);
1285 if (timer->tmr_device >= id.device) {
1286 snd_timer_user_copy_id(&id, timer);
1290 if (p == &snd_timer_list)
1291 snd_timer_user_zero_id(&id);
1293 case SNDRV_TIMER_CLASS_CARD:
1294 case SNDRV_TIMER_CLASS_PCM:
1301 if (id.device < 0) {
1304 id.subdevice = id.subdevice < 0 ? 0 : id.subdevice + 1;
1308 list_for_each(p, &snd_timer_list) {
1309 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1310 if (timer->tmr_class > id.dev_class) {
1311 snd_timer_user_copy_id(&id, timer);
1314 if (timer->tmr_class < id.dev_class)
1316 if (timer->card->number > id.card) {
1317 snd_timer_user_copy_id(&id, timer);
1320 if (timer->card->number < id.card)
1322 if (timer->tmr_device > id.device) {
1323 snd_timer_user_copy_id(&id, timer);
1326 if (timer->tmr_device < id.device)
1328 if (timer->tmr_subdevice > id.subdevice) {
1329 snd_timer_user_copy_id(&id, timer);
1332 if (timer->tmr_subdevice < id.subdevice)
1334 snd_timer_user_copy_id(&id, timer);
1337 if (p == &snd_timer_list)
1338 snd_timer_user_zero_id(&id);
1341 snd_timer_user_zero_id(&id);
1344 up(®ister_mutex);
1345 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1350 static int snd_timer_user_ginfo(struct file *file, snd_timer_ginfo_t __user *_ginfo)
1352 snd_timer_ginfo_t *ginfo;
1355 struct list_head *p;
1358 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1361 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1366 memset(ginfo, 0, sizeof(*ginfo));
1368 down(®ister_mutex);
1369 t = snd_timer_find(&tid);
1371 ginfo->card = t->card ? t->card->number : -1;
1372 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1373 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1374 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1375 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1376 ginfo->resolution = t->hw.resolution;
1377 if (t->hw.resolution_min > 0) {
1378 ginfo->resolution_min = t->hw.resolution_min;
1379 ginfo->resolution_max = t->hw.resolution_max;
1381 list_for_each(p, &t->open_list_head) {
1387 up(®ister_mutex);
1388 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1394 static int snd_timer_user_gparams(struct file *file, snd_timer_gparams_t __user *_gparams)
1396 snd_timer_gparams_t gparams;
1400 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1402 down(®ister_mutex);
1403 t = snd_timer_find(&gparams.tid);
1405 if (list_empty(&t->open_list_head)) {
1406 if (t->hw.set_period)
1407 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1416 up(®ister_mutex);
1420 static int snd_timer_user_gstatus(struct file *file, snd_timer_gstatus_t __user *_gstatus)
1422 snd_timer_gstatus_t gstatus;
1427 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1430 memset(&gstatus, 0, sizeof(gstatus));
1432 down(®ister_mutex);
1433 t = snd_timer_find(&tid);
1435 if (t->hw.c_resolution)
1436 gstatus.resolution = t->hw.c_resolution(t);
1438 gstatus.resolution = t->hw.resolution;
1439 if (t->hw.precise_resolution) {
1440 t->hw.precise_resolution(t, &gstatus.resolution_num, &gstatus.resolution_den);
1442 gstatus.resolution_num = gstatus.resolution;
1443 gstatus.resolution_den = 1000000000uL;
1448 up(®ister_mutex);
1449 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1454 static int snd_timer_user_tselect(struct file *file, snd_timer_select_t __user *_tselect)
1456 snd_timer_user_t *tu;
1457 snd_timer_select_t tselect;
1461 tu = file->private_data;
1462 down(&tu->tread_sem);
1464 snd_timer_close(tu->timeri);
1467 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1471 sprintf(str, "application %i", current->pid);
1472 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1473 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1474 if ((err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid)) < 0)
1486 tu->tqueue = (snd_timer_tread_t *)kmalloc(tu->queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
1487 if (tu->tqueue == NULL)
1490 tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1491 if (tu->queue == NULL)
1496 snd_timer_close(tu->timeri);
1499 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1500 tu->timeri->callback = tu->tread ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1501 tu->timeri->ccallback = snd_timer_user_ccallback;
1502 tu->timeri->callback_data = (void *)tu;
1510 static int snd_timer_user_info(struct file *file, snd_timer_info_t __user *_info)
1512 snd_timer_user_t *tu;
1513 snd_timer_info_t *info;
1517 tu = file->private_data;
1518 snd_assert(tu->timeri != NULL, return -ENXIO);
1519 t = tu->timeri->timer;
1520 snd_assert(t != NULL, return -ENXIO);
1522 info = kcalloc(1, sizeof(*info), GFP_KERNEL);
1525 info->card = t->card ? t->card->number : -1;
1526 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1527 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1528 strlcpy(info->id, t->id, sizeof(info->id));
1529 strlcpy(info->name, t->name, sizeof(info->name));
1530 info->resolution = t->hw.resolution;
1531 if (copy_to_user(_info, info, sizeof(*_info)))
1537 static int snd_timer_user_params(struct file *file, snd_timer_params_t __user *_params)
1539 snd_timer_user_t *tu;
1540 snd_timer_params_t params;
1542 snd_timer_read_t *tr;
1543 snd_timer_tread_t *ttr;
1546 tu = file->private_data;
1547 snd_assert(tu->timeri != NULL, return -ENXIO);
1548 t = tu->timeri->timer;
1549 snd_assert(t != NULL, return -ENXIO);
1550 if (copy_from_user(¶ms, _params, sizeof(params)))
1552 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1556 if (params.queue_size > 0 && (params.queue_size < 32 || params.queue_size > 1024)) {
1560 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1561 (1<<SNDRV_TIMER_EVENT_TICK)|
1562 (1<<SNDRV_TIMER_EVENT_START)|
1563 (1<<SNDRV_TIMER_EVENT_STOP)|
1564 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1565 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1566 (1<<SNDRV_TIMER_EVENT_MSTART)|
1567 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1568 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1569 (1<<SNDRV_TIMER_EVENT_MPAUSE))) {
1573 snd_timer_stop(tu->timeri);
1574 spin_lock_irq(&t->lock);
1575 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1576 SNDRV_TIMER_IFLG_EXCLUSIVE|
1577 SNDRV_TIMER_IFLG_EARLY_EVENT);
1578 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1579 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1580 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1581 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1582 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1583 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1584 spin_unlock_irq(&t->lock);
1585 if (params.queue_size > 0 && (unsigned int)tu->queue_size != params.queue_size) {
1587 ttr = (snd_timer_tread_t *)kmalloc(params.queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
1590 tu->queue_size = params.queue_size;
1594 tr = (snd_timer_read_t *)kmalloc(params.queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1597 tu->queue_size = params.queue_size;
1602 tu->qhead = tu->qtail = tu->qused = 0;
1603 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1605 snd_timer_tread_t tread;
1606 tread.event = SNDRV_TIMER_EVENT_EARLY;
1607 tread.tstamp.tv_sec = 0;
1608 tread.tstamp.tv_nsec = 0;
1610 snd_timer_user_append_to_tqueue(tu, &tread);
1612 snd_timer_read_t *r = &tu->queue[0];
1620 tu->filter = params.filter;
1621 tu->ticks = params.ticks;
1624 if (copy_to_user(_params, ¶ms, sizeof(params)))
1629 static int snd_timer_user_status(struct file *file, snd_timer_status_t __user *_status)
1631 snd_timer_user_t *tu;
1632 snd_timer_status_t status;
1634 tu = file->private_data;
1635 snd_assert(tu->timeri != NULL, return -ENXIO);
1636 memset(&status, 0, sizeof(status));
1637 status.tstamp = tu->tstamp;
1638 status.resolution = snd_timer_resolution(tu->timeri);
1639 status.lost = tu->timeri->lost;
1640 status.overrun = tu->overrun;
1641 spin_lock_irq(&tu->qlock);
1642 status.queue = tu->qused;
1643 spin_unlock_irq(&tu->qlock);
1644 if (copy_to_user(_status, &status, sizeof(status)))
1649 static int snd_timer_user_start(struct file *file)
1652 snd_timer_user_t *tu;
1654 tu = file->private_data;
1655 snd_assert(tu->timeri != NULL, return -ENXIO);
1656 snd_timer_stop(tu->timeri);
1657 tu->timeri->lost = 0;
1658 tu->last_resolution = 0;
1659 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1662 static int snd_timer_user_stop(struct file *file)
1665 snd_timer_user_t *tu;
1667 tu = file->private_data;
1668 snd_assert(tu->timeri != NULL, return -ENXIO);
1669 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1672 static int snd_timer_user_continue(struct file *file)
1675 snd_timer_user_t *tu;
1677 tu = file->private_data;
1678 snd_assert(tu->timeri != NULL, return -ENXIO);
1679 tu->timeri->lost = 0;
1680 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1683 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1685 snd_timer_user_t *tu;
1686 void __user *argp = (void __user *)arg;
1687 int __user *p = argp;
1689 tu = file->private_data;
1691 case SNDRV_TIMER_IOCTL_PVERSION:
1692 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1693 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1694 return snd_timer_user_next_device(argp);
1695 case SNDRV_TIMER_IOCTL_TREAD:
1699 down(&tu->tread_sem);
1700 if (tu->timeri) { /* too late */
1704 if (get_user(xarg, p)) {
1708 tu->tread = xarg ? 1 : 0;
1712 case SNDRV_TIMER_IOCTL_GINFO:
1713 return snd_timer_user_ginfo(file, argp);
1714 case SNDRV_TIMER_IOCTL_GPARAMS:
1715 return snd_timer_user_gparams(file, argp);
1716 case SNDRV_TIMER_IOCTL_GSTATUS:
1717 return snd_timer_user_gstatus(file, argp);
1718 case SNDRV_TIMER_IOCTL_SELECT:
1719 return snd_timer_user_tselect(file, argp);
1720 case SNDRV_TIMER_IOCTL_INFO:
1721 return snd_timer_user_info(file, argp);
1722 case SNDRV_TIMER_IOCTL_PARAMS:
1723 return snd_timer_user_params(file, argp);
1724 case SNDRV_TIMER_IOCTL_STATUS:
1725 return snd_timer_user_status(file, argp);
1726 case SNDRV_TIMER_IOCTL_START:
1727 return snd_timer_user_start(file);
1728 case SNDRV_TIMER_IOCTL_STOP:
1729 return snd_timer_user_stop(file);
1730 case SNDRV_TIMER_IOCTL_CONTINUE:
1731 return snd_timer_user_continue(file);
1736 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1738 snd_timer_user_t *tu;
1741 tu = file->private_data;
1742 err = fasync_helper(fd, file, on, &tu->fasync);
1748 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
1750 snd_timer_user_t *tu;
1751 long result = 0, unit;
1754 tu = file->private_data;
1755 unit = tu->tread ? sizeof(snd_timer_tread_t) : sizeof(snd_timer_read_t);
1756 spin_lock_irq(&tu->qlock);
1757 while ((long)count - result >= unit) {
1758 while (!tu->qused) {
1761 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1766 set_current_state(TASK_INTERRUPTIBLE);
1767 init_waitqueue_entry(&wait, current);
1768 add_wait_queue(&tu->qchange_sleep, &wait);
1770 spin_unlock_irq(&tu->qlock);
1772 spin_lock_irq(&tu->qlock);
1774 remove_wait_queue(&tu->qchange_sleep, &wait);
1776 if (signal_pending(current)) {
1782 spin_unlock_irq(&tu->qlock);
1787 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], sizeof(snd_timer_tread_t))) {
1792 if (copy_to_user(buffer, &tu->queue[tu->qhead++], sizeof(snd_timer_read_t))) {
1798 tu->qhead %= tu->queue_size;
1803 spin_lock_irq(&tu->qlock);
1806 spin_unlock_irq(&tu->qlock);
1808 return result > 0 ? result : err;
1811 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1814 snd_timer_user_t *tu;
1816 tu = file->private_data;
1818 poll_wait(file, &tu->qchange_sleep, wait);
1822 mask |= POLLIN | POLLRDNORM;
1827 #ifdef CONFIG_COMPAT
1828 #include "timer_compat.c"
1830 #define snd_timer_user_ioctl_compat NULL
1833 static struct file_operations snd_timer_f_ops =
1835 .owner = THIS_MODULE,
1836 .read = snd_timer_user_read,
1837 .open = snd_timer_user_open,
1838 .release = snd_timer_user_release,
1839 .poll = snd_timer_user_poll,
1840 .unlocked_ioctl = snd_timer_user_ioctl,
1841 .compat_ioctl = snd_timer_user_ioctl_compat,
1842 .fasync = snd_timer_user_fasync,
1845 static snd_minor_t snd_timer_reg =
1848 .f_ops = &snd_timer_f_ops,
1855 static snd_info_entry_t *snd_timer_proc_entry = NULL;
1857 static int __init alsa_timer_init(void)
1860 snd_info_entry_t *entry;
1862 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1863 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, "system timer");
1865 if ((entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL)) != NULL) {
1866 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128;
1867 entry->c.text.read = snd_timer_proc_read;
1868 if (snd_info_register(entry) < 0) {
1869 snd_info_free_entry(entry);
1873 snd_timer_proc_entry = entry;
1874 if ((err = snd_timer_register_system()) < 0)
1875 snd_printk(KERN_ERR "unable to register system timer (%i)\n", err);
1876 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER,
1877 NULL, 0, &snd_timer_reg, "timer"))<0)
1878 snd_printk(KERN_ERR "unable to register timer device (%i)\n", err);
1882 static void __exit alsa_timer_exit(void)
1884 struct list_head *p, *n;
1886 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1887 /* unregister the system timer */
1888 list_for_each_safe(p, n, &snd_timer_list) {
1889 snd_timer_t *timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1890 snd_timer_unregister(timer);
1892 if (snd_timer_proc_entry) {
1893 snd_info_unregister(snd_timer_proc_entry);
1894 snd_timer_proc_entry = NULL;
1896 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1897 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1901 module_init(alsa_timer_init)
1902 module_exit(alsa_timer_exit)
1904 EXPORT_SYMBOL(snd_timer_open);
1905 EXPORT_SYMBOL(snd_timer_close);
1906 EXPORT_SYMBOL(snd_timer_resolution);
1907 EXPORT_SYMBOL(snd_timer_start);
1908 EXPORT_SYMBOL(snd_timer_stop);
1909 EXPORT_SYMBOL(snd_timer_continue);
1910 EXPORT_SYMBOL(snd_timer_pause);
1911 EXPORT_SYMBOL(snd_timer_new);
1912 EXPORT_SYMBOL(snd_timer_notify);
1913 EXPORT_SYMBOL(snd_timer_global_new);
1914 EXPORT_SYMBOL(snd_timer_global_free);
1915 EXPORT_SYMBOL(snd_timer_global_register);
1916 EXPORT_SYMBOL(snd_timer_global_unregister);
1917 EXPORT_SYMBOL(snd_timer_interrupt);
1918 EXPORT_SYMBOL(snd_timer_system_resolution);