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/slab.h>
26 #include <linux/time.h>
27 #include <linux/moduleparam.h>
28 #include <sound/core.h>
29 #include <sound/timer.h>
30 #include <sound/control.h>
31 #include <sound/info.h>
32 #include <sound/minors.h>
33 #include <sound/initval.h>
34 #include <linux/kmod.h>
36 #include <linux/kerneld.h>
39 #if !defined(CONFIG_SND_RTCTIMER) && !defined(CONFIG_SND_RTCTIMER_MODULE)
40 #define DEFAULT_TIMER_LIMIT 1
42 #define DEFAULT_TIMER_LIMIT 2
45 static int timer_limit = DEFAULT_TIMER_LIMIT;
46 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>");
47 MODULE_DESCRIPTION("ALSA timer interface");
48 MODULE_LICENSE("GPL");
49 MODULE_CLASSES("{sound}");
50 module_param(timer_limit, int, 0444);
51 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
54 snd_timer_instance_t *timeri;
55 int tread; /* enhanced read with timestamps and events */
57 unsigned long overrun;
62 snd_timer_read_t *queue;
63 snd_timer_tread_t *tqueue;
65 unsigned long last_resolution;
67 struct timespec tstamp; /* trigger tstamp */
68 wait_queue_head_t qchange_sleep;
69 struct fasync_struct *fasync;
73 static LIST_HEAD(snd_timer_list);
75 /* list of slave instances */
76 static LIST_HEAD(snd_timer_slave_list);
78 /* lock for slave active lists */
79 static spinlock_t slave_active_lock = SPIN_LOCK_UNLOCKED;
81 static DECLARE_MUTEX(register_mutex);
83 static int snd_timer_free(snd_timer_t *timer);
84 static int snd_timer_dev_free(snd_device_t *device);
85 static int snd_timer_dev_register(snd_device_t *device);
86 static int snd_timer_dev_unregister(snd_device_t *device);
88 static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left);
91 * create a timer instance with the given owner string.
92 * when timer is not NULL, increments the module counter
94 static snd_timer_instance_t *snd_timer_instance_new(char *owner, snd_timer_t *timer)
96 snd_timer_instance_t *timeri;
97 timeri = snd_kcalloc(sizeof(snd_timer_instance_t), GFP_KERNEL);
100 timeri->owner = snd_kmalloc_strdup(owner, GFP_KERNEL);
101 if (! timeri->owner) {
105 INIT_LIST_HEAD(&timeri->open_list);
106 INIT_LIST_HEAD(&timeri->active_list);
107 INIT_LIST_HEAD(&timeri->ack_list);
108 INIT_LIST_HEAD(&timeri->slave_list_head);
109 INIT_LIST_HEAD(&timeri->slave_active_head);
111 timeri->timer = timer;
112 if (timer && timer->card && !try_module_get(timer->card->module)) {
113 kfree(timeri->owner);
122 * find a timer instance from the given timer id
124 static snd_timer_t *snd_timer_find(snd_timer_id_t *tid)
126 snd_timer_t *timer = NULL;
129 list_for_each(p, &snd_timer_list) {
130 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
132 if (timer->tmr_class != tid->dev_class)
134 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
135 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
136 (timer->card == NULL ||
137 timer->card->number != tid->card))
139 if (timer->tmr_device != tid->device)
141 if (timer->tmr_subdevice != tid->subdevice)
150 static void snd_timer_request(snd_timer_id_t *tid)
152 if (! current->fs->root)
154 switch (tid->dev_class) {
155 case SNDRV_TIMER_CLASS_GLOBAL:
156 if (tid->device < timer_limit)
157 request_module("snd-timer-%i", tid->device);
159 case SNDRV_TIMER_CLASS_CARD:
160 case SNDRV_TIMER_CLASS_PCM:
161 if (tid->card < snd_ecards_limit)
162 request_module("snd-card-%i", tid->card);
172 * look for a master instance matching with the slave id of the given slave.
173 * when found, relink the open_link of the slave.
175 * call this with register_mutex down.
177 static void snd_timer_check_slave(snd_timer_instance_t *slave)
180 snd_timer_instance_t *master;
181 struct list_head *p, *q;
183 /* FIXME: it's really dumb to look up all entries.. */
184 list_for_each(p, &snd_timer_list) {
185 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
186 list_for_each(q, &timer->open_list_head) {
187 master = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list);
188 if (slave->slave_class == master->slave_class &&
189 slave->slave_id == master->slave_id) {
190 list_del(&slave->open_list);
191 list_add_tail(&slave->open_list, &master->slave_list_head);
192 spin_lock_irq(&slave_active_lock);
193 slave->master = master;
194 slave->timer = master->timer;
195 spin_unlock_irq(&slave_active_lock);
203 * look for slave instances matching with the slave id of the given master.
204 * when found, relink the open_link of slaves.
206 * call this with register_mutex down.
208 static void snd_timer_check_master(snd_timer_instance_t *master)
210 snd_timer_instance_t *slave;
211 struct list_head *p, *n;
213 /* check all pending slaves */
214 list_for_each_safe(p, n, &snd_timer_slave_list) {
215 slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
216 if (slave->slave_class == master->slave_class &&
217 slave->slave_id == master->slave_id) {
219 list_add_tail(p, &master->slave_list_head);
220 spin_lock_irq(&slave_active_lock);
221 slave->master = master;
222 slave->timer = master->timer;
223 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
224 list_add_tail(&slave->active_list, &master->slave_active_head);
225 spin_unlock_irq(&slave_active_lock);
231 * open a timer instance
232 * when opening a master, the slave id must be here given.
234 int snd_timer_open(snd_timer_instance_t **ti,
235 char *owner, snd_timer_id_t *tid,
236 unsigned int slave_id)
239 snd_timer_instance_t *timeri = NULL;
241 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
242 /* open a slave instance */
243 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
244 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
245 snd_printd("invalid slave class %i\n", tid->dev_sclass);
248 down(®ister_mutex);
249 timeri = snd_timer_instance_new(owner, NULL);
250 timeri->slave_class = tid->dev_sclass;
251 timeri->slave_id = tid->device;
252 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
253 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
254 snd_timer_check_slave(timeri);
260 /* open a master instance */
261 down(®ister_mutex);
262 timer = snd_timer_find(tid);
266 snd_timer_request(tid);
267 down(®ister_mutex);
268 timer = snd_timer_find(tid);
272 if (!list_empty(&timer->open_list_head)) {
273 timeri = (snd_timer_instance_t *)list_entry(timer->open_list_head.next, snd_timer_instance_t, open_list);
274 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
279 timeri = snd_timer_instance_new(owner, timer);
281 timeri->slave_class = tid->dev_sclass;
282 timeri->slave_id = slave_id;
283 if (list_empty(&timer->open_list_head) && timer->hw.open)
284 timer->hw.open(timer);
285 list_add_tail(&timeri->open_list, &timer->open_list_head);
286 snd_timer_check_master(timeri);
297 static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event);
300 * close a timer instance
302 int snd_timer_close(snd_timer_instance_t * timeri)
304 snd_timer_t *timer = NULL;
305 struct list_head *p, *n;
306 snd_timer_instance_t *slave;
308 snd_assert(timeri != NULL, return -ENXIO);
310 /* force to stop the timer */
311 snd_timer_stop(timeri);
313 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
314 /* wait, until the active callback is finished */
315 spin_lock_irq(&slave_active_lock);
316 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
317 spin_unlock_irq(&slave_active_lock);
319 spin_lock_irq(&slave_active_lock);
321 spin_unlock_irq(&slave_active_lock);
322 down(®ister_mutex);
323 list_del(&timeri->open_list);
326 timer = timeri->timer;
327 /* wait, until the active callback is finished */
328 spin_lock_irq(&timer->lock);
329 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
330 spin_unlock_irq(&timer->lock);
332 spin_lock_irq(&timer->lock);
334 spin_unlock_irq(&timer->lock);
335 down(®ister_mutex);
336 list_del(&timeri->open_list);
337 if (timer && list_empty(&timer->open_list_head) && timer->hw.close)
338 timer->hw.close(timer);
339 /* remove slave links */
340 list_for_each_safe(p, n, &timeri->slave_list_head) {
341 slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
342 spin_lock_irq(&slave_active_lock);
343 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
345 list_add_tail(p, &snd_timer_slave_list);
346 slave->master = NULL;
348 spin_unlock_irq(&slave_active_lock);
352 if (timeri->private_free)
353 timeri->private_free(timeri);
355 kfree(timeri->owner);
357 if (timer && timer->card)
358 module_put(timer->card->module);
362 unsigned long snd_timer_resolution(snd_timer_instance_t * timeri)
368 if ((timer = timeri->timer) != NULL) {
369 if (timer->hw.c_resolution)
370 return timer->hw.c_resolution(timer);
371 return timer->hw.resolution;
376 static void snd_timer_notify1(snd_timer_instance_t *ti, enum sndrv_timer_event event)
380 unsigned long resolution = 0;
381 snd_timer_instance_t *ts;
383 struct timespec tstamp;
385 snd_timestamp_now(&tstamp, 1);
386 snd_assert(event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE, return);
387 if (event == SNDRV_TIMER_EVENT_START || event == SNDRV_TIMER_EVENT_CONTINUE)
388 resolution = snd_timer_resolution(ti);
390 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
391 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
396 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
398 spin_lock_irqsave(&timer->lock, flags);
399 list_for_each(n, &ti->slave_active_head) {
400 ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
402 ts->ccallback(ti, event + 100, &tstamp, resolution);
404 spin_unlock_irqrestore(&timer->lock, flags);
407 static int snd_timer_start1(snd_timer_t *timer, snd_timer_instance_t *timeri, unsigned long sticks)
409 list_del(&timeri->active_list);
410 list_add_tail(&timeri->active_list, &timer->active_list_head);
411 if (timer->running) {
412 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
414 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
415 timeri->flags |= SNDRV_TIMER_IFLG_START;
416 return 1; /* delayed start */
418 timer->sticks = sticks;
419 timer->hw.start(timer);
422 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
427 static int snd_timer_start_slave(snd_timer_instance_t *timeri)
431 spin_lock_irqsave(&slave_active_lock, flags);
432 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
434 list_add_tail(&timeri->active_list, &timeri->master->slave_active_head);
435 spin_unlock_irqrestore(&slave_active_lock, flags);
436 return 1; /* delayed start */
440 * start the timer instance
442 int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks)
445 int result = -EINVAL;
448 if (timeri == NULL || ticks < 1)
450 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
451 result = snd_timer_start_slave(timeri);
452 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
455 timer = timeri->timer;
458 spin_lock_irqsave(&timer->lock, flags);
459 timeri->ticks = timeri->cticks = ticks;
461 result = snd_timer_start1(timer, timeri, ticks);
462 spin_unlock_irqrestore(&timer->lock, flags);
463 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
467 static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event)
472 snd_assert(timeri != NULL, return -ENXIO);
474 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
476 spin_lock_irqsave(&slave_active_lock, flags);
477 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
478 spin_unlock_irqrestore(&slave_active_lock, flags);
482 timer = timeri->timer;
485 spin_lock_irqsave(&timer->lock, flags);
486 list_del_init(&timeri->ack_list);
487 list_del_init(&timeri->active_list);
488 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
489 !(--timer->running)) {
490 timer->hw.stop(timer);
491 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
492 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
493 snd_timer_reschedule(timer, 0);
494 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
495 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
496 timer->hw.start(timer);
501 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING|SNDRV_TIMER_IFLG_START);
502 spin_unlock_irqrestore(&timer->lock, flags);
504 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
505 snd_timer_notify1(timeri, event);
510 * stop the timer instance.
512 * do not call this from the timer callback!
514 int snd_timer_stop(snd_timer_instance_t * timeri)
520 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
523 timer = timeri->timer;
524 spin_lock_irqsave(&timer->lock, flags);
525 timeri->cticks = timeri->ticks;
527 spin_unlock_irqrestore(&timer->lock, flags);
532 * start again.. the tick is kept.
534 int snd_timer_continue(snd_timer_instance_t * timeri)
537 int result = -EINVAL;
542 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
543 return snd_timer_start_slave(timeri);
544 timer = timeri->timer;
547 spin_lock_irqsave(&timer->lock, flags);
551 result = snd_timer_start1(timer, timeri, timer->sticks);
552 spin_unlock_irqrestore(&timer->lock, flags);
553 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
558 * pause.. remember the ticks left
560 int snd_timer_pause(snd_timer_instance_t * timeri)
562 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
566 * reschedule the timer
568 * start pending instances and check the scheduling ticks.
569 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
571 static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left)
573 snd_timer_instance_t *ti;
574 unsigned long ticks = ~0UL;
577 list_for_each(p, &timer->active_list_head) {
578 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
579 if (ti->flags & SNDRV_TIMER_IFLG_START) {
580 ti->flags &= ~SNDRV_TIMER_IFLG_START;
581 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
584 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
585 if (ticks > ti->cticks)
590 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
593 if (ticks > timer->hw.ticks)
594 ticks = timer->hw.ticks;
595 if (ticks_left != ticks)
596 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
597 timer->sticks = ticks;
604 static void snd_timer_tasklet(unsigned long arg)
606 snd_timer_t *timer = (snd_timer_t *) arg;
607 snd_timer_instance_t *ti;
609 unsigned long resolution, ticks;
611 spin_lock(&timer->lock);
612 /* now process all callbacks */
613 while (!list_empty(&timer->sack_list_head)) {
614 p = timer->sack_list_head.next; /* get first item */
615 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
617 /* remove from ack_list and make empty */
622 resolution = ti->resolution;
624 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
625 spin_unlock(&timer->lock);
627 ti->callback(ti, resolution, ticks);
628 spin_lock(&timer->lock);
629 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
631 spin_unlock(&timer->lock);
637 * ticks_left is usually equal to timer->sticks.
640 void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left)
642 snd_timer_instance_t *ti, *ts;
643 unsigned long resolution, ticks;
644 struct list_head *p, *q, *n;
650 spin_lock(&timer->lock);
652 /* remember the current resolution */
653 if (timer->hw.c_resolution)
654 resolution = timer->hw.c_resolution(timer);
656 resolution = timer->hw.resolution;
658 /* loop for all active instances
659 * here we cannot use list_for_each because the active_list of a processed
660 * instance is relinked to done_list_head before callback is called.
662 list_for_each_safe(p, n, &timer->active_list_head) {
663 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
664 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
666 ti->pticks += ticks_left;
667 ti->resolution = resolution;
668 if (ti->cticks < ticks_left)
671 ti->cticks -= ticks_left;
672 if (ti->cticks) /* not expired */
674 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
675 ti->cticks = ti->ticks;
677 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
678 if (--timer->running)
681 if (list_empty(&ti->ack_list)) {
682 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
683 (ti->flags & SNDRV_TIMER_IFLG_FAST)) {
684 list_add_tail(&ti->ack_list, &timer->ack_list_head);
686 list_add_tail(&ti->ack_list, &timer->sack_list_head);
689 list_for_each(q, &ti->slave_active_head) {
690 ts = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, active_list);
691 ts->pticks = ti->pticks;
692 ts->resolution = resolution;
693 if (list_empty(&ts->ack_list)) {
694 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
695 (ti->flags & SNDRV_TIMER_IFLG_FAST)) {
696 list_add_tail(&ts->ack_list, &timer->ack_list_head);
698 list_add_tail(&ts->ack_list, &timer->sack_list_head);
703 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
704 snd_timer_reschedule(timer, ticks_left);
705 if (timer->running) {
706 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
707 timer->hw.stop(timer);
708 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
710 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
711 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
713 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
714 timer->hw.start(timer);
717 timer->hw.stop(timer);
720 /* now process all fast callbacks */
721 while (!list_empty(&timer->ack_list_head)) {
722 p = timer->ack_list_head.next; /* get first item */
723 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
725 /* remove from ack_list and make empty */
731 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
732 spin_unlock(&timer->lock);
734 ti->callback(ti, resolution, ticks);
735 spin_lock(&timer->lock);
736 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
739 /* do we have any slow callbacks? */
740 use_tasklet = !list_empty(&timer->sack_list_head);
741 spin_unlock(&timer->lock);
744 tasklet_hi_schedule(&timer->task_queue);
751 int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t ** rtimer)
755 static snd_device_ops_t ops = {
756 .dev_free = snd_timer_dev_free,
757 .dev_register = snd_timer_dev_register,
758 .dev_unregister = snd_timer_dev_unregister
761 snd_assert(tid != NULL, return -EINVAL);
762 snd_assert(rtimer != NULL, return -EINVAL);
764 timer = snd_magic_kcalloc(snd_timer_t, 0, GFP_KERNEL);
767 timer->tmr_class = tid->dev_class;
769 timer->tmr_device = tid->device;
770 timer->tmr_subdevice = tid->subdevice;
772 strlcpy(timer->id, id, sizeof(timer->id));
773 INIT_LIST_HEAD(&timer->device_list);
774 INIT_LIST_HEAD(&timer->open_list_head);
775 INIT_LIST_HEAD(&timer->active_list_head);
776 INIT_LIST_HEAD(&timer->ack_list_head);
777 INIT_LIST_HEAD(&timer->sack_list_head);
778 spin_lock_init(&timer->lock);
779 tasklet_init(&timer->task_queue, snd_timer_tasklet, (unsigned long)timer);
781 if ((err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops)) < 0) {
782 snd_timer_free(timer);
790 static int snd_timer_free(snd_timer_t *timer)
792 snd_assert(timer != NULL, return -ENXIO);
793 if (timer->private_free)
794 timer->private_free(timer);
795 snd_magic_kfree(timer);
799 int snd_timer_dev_free(snd_device_t *device)
801 snd_timer_t *timer = snd_magic_cast(snd_timer_t, device->device_data, return -ENXIO);
802 return snd_timer_free(timer);
805 int snd_timer_dev_register(snd_device_t *dev)
807 snd_timer_t *timer = snd_magic_cast(snd_timer_t, dev->device_data, return -ENXIO);
811 snd_assert(timer != NULL && timer->hw.start != NULL && timer->hw.stop != NULL, return -ENXIO);
812 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
813 !timer->hw.resolution && timer->hw.c_resolution == NULL)
816 down(®ister_mutex);
817 list_for_each(p, &snd_timer_list) {
818 timer1 = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
819 if (timer1->tmr_class > timer->tmr_class)
821 if (timer1->tmr_class < timer->tmr_class)
823 if (timer1->card && timer->card) {
824 if (timer1->card->number > timer->card->number)
826 if (timer1->card->number < timer->card->number)
829 if (timer1->tmr_device > timer->tmr_device)
831 if (timer1->tmr_device < timer->tmr_device)
833 if (timer1->tmr_subdevice > timer->tmr_subdevice)
835 if (timer1->tmr_subdevice < timer->tmr_subdevice)
841 list_add_tail(&timer->device_list, p);
846 int snd_timer_unregister(snd_timer_t *timer)
848 struct list_head *p, *n;
849 snd_timer_instance_t *ti;
851 snd_assert(timer != NULL, return -ENXIO);
852 down(®ister_mutex);
853 if (! list_empty(&timer->open_list_head)) {
854 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer);
855 list_for_each_safe(p, n, &timer->open_list_head) {
857 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
861 list_del(&timer->device_list);
863 return snd_timer_free(timer);
866 static int snd_timer_dev_unregister(snd_device_t *device)
868 snd_timer_t *timer = snd_magic_cast(snd_timer_t, device->device_data, return -ENXIO);
869 return snd_timer_unregister(timer);
872 void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, struct timespec *tstamp)
875 unsigned long resolution = 0;
876 snd_timer_instance_t *ti, *ts;
877 struct list_head *p, *n;
879 snd_runtime_check(timer->hw.flags & SNDRV_TIMER_HW_SLAVE, return);
880 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && event <= SNDRV_TIMER_EVENT_MPAUSE, return);
881 spin_lock_irqsave(&timer->lock, flags);
882 if (event == SNDRV_TIMER_EVENT_MSTART || event == SNDRV_TIMER_EVENT_MCONTINUE) {
883 if (timer->hw.c_resolution)
884 resolution = timer->hw.c_resolution(timer);
886 resolution = timer->hw.resolution;
888 list_for_each(p, &timer->active_list_head) {
889 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
891 ti->ccallback(ti, event, tstamp, resolution);
892 list_for_each(n, &ti->slave_active_head) {
893 ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
895 ts->ccallback(ts, event, tstamp, resolution);
898 spin_unlock_irqrestore(&timer->lock, flags);
902 * exported functions for global timers
904 int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer)
908 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
909 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
913 return snd_timer_new(NULL, id, &tid, rtimer);
916 int snd_timer_global_free(snd_timer_t *timer)
918 return snd_timer_free(timer);
921 int snd_timer_global_register(snd_timer_t *timer)
925 memset(&dev, 0, sizeof(dev));
926 dev.device_data = timer;
927 return snd_timer_dev_register(&dev);
930 int snd_timer_global_unregister(snd_timer_t *timer)
932 return snd_timer_unregister(timer);
939 struct snd_timer_system_private {
940 struct timer_list tlist;
941 struct timer * timer;
942 unsigned long last_expires;
943 unsigned long last_jiffies;
944 unsigned long correction;
947 unsigned int snd_timer_system_resolution(void)
949 return 1000000000L / HZ;
952 static void snd_timer_s_function(unsigned long data)
954 snd_timer_t *timer = (snd_timer_t *)data;
955 struct snd_timer_system_private *priv = timer->private_data;
956 unsigned long jiff = jiffies;
957 if (time_after(jiff, priv->last_expires))
958 priv->correction = (long)jiff - (long)priv->last_expires;
959 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
962 static int snd_timer_s_start(snd_timer_t * timer)
964 struct snd_timer_system_private *priv;
967 priv = (struct snd_timer_system_private *) timer->private_data;
968 njiff = (priv->last_jiffies = jiffies);
969 if (priv->correction > timer->sticks - 1) {
970 priv->correction -= timer->sticks - 1;
973 njiff += timer->sticks - priv->correction;
974 priv->correction -= timer->sticks;
976 priv->last_expires = priv->tlist.expires = njiff;
977 add_timer(&priv->tlist);
981 static int snd_timer_s_stop(snd_timer_t * timer)
983 struct snd_timer_system_private *priv;
986 priv = (struct snd_timer_system_private *) timer->private_data;
987 del_timer(&priv->tlist);
989 if (time_before(jiff, priv->last_expires))
990 timer->sticks = priv->last_expires - jiff;
996 static struct _snd_timer_hardware snd_timer_system =
998 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
999 .resolution = 1000000000L / HZ,
1001 .start = snd_timer_s_start,
1002 .stop = snd_timer_s_stop
1005 static void snd_timer_free_system(snd_timer_t *timer)
1007 if (timer->private_data)
1008 kfree(timer->private_data);
1011 static int snd_timer_register_system(void)
1014 struct snd_timer_system_private *priv;
1017 if ((err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer)) < 0)
1019 strcpy(timer->name, "system timer");
1020 timer->hw = snd_timer_system;
1021 priv = (struct snd_timer_system_private *) snd_kcalloc(sizeof(struct snd_timer_system_private), GFP_KERNEL);
1023 snd_timer_free(timer);
1026 init_timer(&priv->tlist);
1027 priv->tlist.function = snd_timer_s_function;
1028 priv->tlist.data = (unsigned long) timer;
1029 timer->private_data = priv;
1030 timer->private_free = snd_timer_free_system;
1031 return snd_timer_global_register(timer);
1038 static void snd_timer_proc_read(snd_info_entry_t *entry,
1039 snd_info_buffer_t * buffer)
1041 unsigned long flags;
1043 snd_timer_instance_t *ti;
1044 struct list_head *p, *q;
1046 down(®ister_mutex);
1047 list_for_each(p, &snd_timer_list) {
1048 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1049 switch (timer->tmr_class) {
1050 case SNDRV_TIMER_CLASS_GLOBAL:
1051 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1053 case SNDRV_TIMER_CLASS_CARD:
1054 snd_iprintf(buffer, "C%i-%i: ", timer->card->number, timer->tmr_device);
1056 case SNDRV_TIMER_CLASS_PCM:
1057 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, timer->tmr_device, timer->tmr_subdevice);
1060 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, timer->card ? timer->card->number : -1, timer->tmr_device, timer->tmr_subdevice);
1062 snd_iprintf(buffer, "%s :", timer->name);
1063 if (timer->hw.resolution)
1064 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", timer->hw.resolution / 1000, timer->hw.resolution % 1000, timer->hw.ticks);
1065 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1066 snd_iprintf(buffer, " SLAVE");
1067 snd_iprintf(buffer, "\n");
1068 spin_lock_irqsave(&timer->lock, flags);
1069 list_for_each(q, &timer->open_list_head) {
1070 ti = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list);
1071 snd_iprintf(buffer, " Client %s : %s : lost interrupts %li\n",
1072 ti->owner ? ti->owner : "unknown",
1073 ti->flags & (SNDRV_TIMER_IFLG_START|SNDRV_TIMER_IFLG_RUNNING) ? "running" : "stopped",
1076 spin_unlock_irqrestore(&timer->lock, flags);
1078 up(®ister_mutex);
1082 * USER SPACE interface
1085 static void snd_timer_user_interrupt(snd_timer_instance_t *timeri,
1086 unsigned long resolution,
1087 unsigned long ticks)
1089 snd_timer_user_t *tu = snd_magic_cast(snd_timer_user_t, timeri->callback_data, return);
1090 snd_timer_read_t *r;
1093 spin_lock(&tu->qlock);
1094 if (tu->qused > 0) {
1095 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1096 r = &tu->queue[prev];
1097 if (r->resolution == resolution) {
1102 if (tu->qused >= tu->queue_size) {
1105 r = &tu->queue[tu->qtail++];
1106 tu->qtail %= tu->queue_size;
1107 r->resolution = resolution;
1112 spin_unlock(&tu->qlock);
1113 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1114 wake_up(&tu->qchange_sleep);
1117 static void snd_timer_user_append_to_tqueue(snd_timer_user_t *tu, snd_timer_tread_t *tread)
1119 if (tu->qused >= tu->queue_size) {
1122 memcpy(&tu->queue[tu->qtail++], tread, sizeof(*tread));
1127 static void snd_timer_user_ccallback(snd_timer_instance_t *timeri,
1128 enum sndrv_timer_event event,
1129 struct timespec *tstamp,
1130 unsigned long resolution)
1132 snd_timer_user_t *tu = snd_magic_cast(snd_timer_user_t, timeri->callback_data, return);
1133 snd_timer_tread_t r1;
1135 if (event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE)
1136 tu->tstamp = *tstamp;
1137 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1140 r1.tstamp = *tstamp;
1141 r1.val = resolution;
1142 spin_lock(&tu->qlock);
1143 snd_timer_user_append_to_tqueue(tu, &r1);
1144 spin_unlock(&tu->qlock);
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 = snd_magic_cast(snd_timer_user_t, timeri->callback_data, return);
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 = snd_magic_kcalloc(snd_timer_user_t, 0, GFP_KERNEL);
1206 spin_lock_init(&tu->qlock);
1207 init_waitqueue_head(&tu->qchange_sleep);
1209 tu->queue_size = 128;
1210 tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1211 if (tu->queue == NULL) {
1212 snd_magic_kfree(tu);
1215 file->private_data = tu;
1219 static int snd_timer_user_release(struct inode *inode, struct file *file)
1221 snd_timer_user_t *tu;
1223 if (file->private_data) {
1224 tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO);
1225 file->private_data = NULL;
1226 fasync_helper(-1, file, 0, &tu->fasync);
1228 snd_timer_close(tu->timeri);
1233 snd_magic_kfree(tu);
1238 static void snd_timer_user_zero_id(snd_timer_id_t *id)
1240 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1241 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1247 static void snd_timer_user_copy_id(snd_timer_id_t *id, snd_timer_t *timer)
1249 id->dev_class = timer->tmr_class;
1250 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1251 id->card = timer->card ? timer->card->number : -1;
1252 id->device = timer->tmr_device;
1253 id->subdevice = timer->tmr_subdevice;
1256 static int snd_timer_user_next_device(snd_timer_id_t __user *_tid)
1260 struct list_head *p;
1262 if (copy_from_user(&id, _tid, sizeof(id)))
1264 down(®ister_mutex);
1265 if (id.dev_class < 0) { /* first item */
1266 if (list_empty(&snd_timer_list))
1267 snd_timer_user_zero_id(&id);
1269 timer = (snd_timer_t *)list_entry(snd_timer_list.next, snd_timer_t, device_list);
1270 snd_timer_user_copy_id(&id, timer);
1273 switch (id.dev_class) {
1274 case SNDRV_TIMER_CLASS_GLOBAL:
1275 id.device = id.device < 0 ? 0 : id.device + 1;
1276 list_for_each(p, &snd_timer_list) {
1277 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1278 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1279 snd_timer_user_copy_id(&id, timer);
1282 if (timer->tmr_device >= id.device) {
1283 snd_timer_user_copy_id(&id, timer);
1287 if (p == &snd_timer_list)
1288 snd_timer_user_zero_id(&id);
1290 case SNDRV_TIMER_CLASS_CARD:
1291 case SNDRV_TIMER_CLASS_PCM:
1298 if (id.device < 0) {
1301 id.subdevice = id.subdevice < 0 ? 0 : id.subdevice + 1;
1305 list_for_each(p, &snd_timer_list) {
1306 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1307 if (timer->tmr_class > id.dev_class) {
1308 snd_timer_user_copy_id(&id, timer);
1311 if (timer->tmr_class < id.dev_class)
1313 if (timer->card->number > id.card) {
1314 snd_timer_user_copy_id(&id, timer);
1317 if (timer->card->number < id.card)
1319 if (timer->tmr_device > id.device) {
1320 snd_timer_user_copy_id(&id, timer);
1323 if (timer->tmr_device < id.device)
1325 if (timer->tmr_subdevice > id.subdevice) {
1326 snd_timer_user_copy_id(&id, timer);
1329 if (timer->tmr_subdevice < id.subdevice)
1331 snd_timer_user_copy_id(&id, timer);
1334 if (p == &snd_timer_list)
1335 snd_timer_user_zero_id(&id);
1338 snd_timer_user_zero_id(&id);
1341 up(®ister_mutex);
1342 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1347 static int snd_timer_user_ginfo(struct file *file, snd_timer_ginfo_t __user *_ginfo)
1349 snd_timer_ginfo_t ginfo;
1352 struct list_head *p;
1355 if (copy_from_user(&ginfo, _ginfo, sizeof(ginfo)))
1358 memset(&ginfo, 0, sizeof(ginfo));
1360 down(®ister_mutex);
1361 t = snd_timer_find(&tid);
1363 ginfo.card = t->card ? t->card->number : -1;
1364 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1365 ginfo.flags |= SNDRV_TIMER_FLG_SLAVE;
1366 strlcpy(ginfo.id, t->id, sizeof(ginfo.id));
1367 strlcpy(ginfo.name, t->name, sizeof(ginfo.name));
1368 ginfo.resolution = t->hw.resolution;
1369 if (t->hw.resolution_min > 0) {
1370 ginfo.resolution_min = t->hw.resolution_min;
1371 ginfo.resolution_max = t->hw.resolution_max;
1373 list_for_each(p, &t->open_list_head) {
1379 up(®ister_mutex);
1380 if (err >= 0 && copy_to_user(_ginfo, &ginfo, sizeof(ginfo)))
1385 static int snd_timer_user_gparams(struct file *file, snd_timer_gparams_t __user *_gparams)
1387 snd_timer_gparams_t gparams;
1391 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1393 down(®ister_mutex);
1394 t = snd_timer_find(&gparams.tid);
1396 if (list_empty(&t->open_list_head)) {
1397 if (t->hw.set_period)
1398 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1407 up(®ister_mutex);
1411 static int snd_timer_user_gstatus(struct file *file, snd_timer_gstatus_t __user *_gstatus)
1413 snd_timer_gstatus_t gstatus;
1418 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1421 memset(&gstatus, 0, sizeof(gstatus));
1423 down(®ister_mutex);
1424 t = snd_timer_find(&tid);
1426 if (t->hw.c_resolution)
1427 gstatus.resolution = t->hw.c_resolution(t);
1429 gstatus.resolution = t->hw.resolution;
1430 if (t->hw.precise_resolution) {
1431 t->hw.precise_resolution(t, &gstatus.resolution_num, &gstatus.resolution_den);
1433 gstatus.resolution_num = gstatus.resolution;
1434 gstatus.resolution_den = 1000000000uL;
1439 up(®ister_mutex);
1440 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1445 static int snd_timer_user_tselect(struct file *file, snd_timer_select_t __user *_tselect)
1447 snd_timer_user_t *tu;
1448 snd_timer_select_t tselect;
1452 tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO);
1454 snd_timer_close(tu->timeri);
1455 if (copy_from_user(&tselect, _tselect, sizeof(tselect)))
1457 sprintf(str, "application %i", current->pid);
1458 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1459 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1460 if ((err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid)) < 0)
1472 tu->tqueue = (snd_timer_tread_t *)kmalloc(tu->queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
1473 if (tu->tqueue == NULL) {
1474 snd_timer_close(tu->timeri);
1478 tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1479 if (tu->queue == NULL) {
1480 snd_timer_close(tu->timeri);
1485 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1486 tu->timeri->callback = tu->tread ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1487 tu->timeri->ccallback = snd_timer_user_ccallback;
1488 tu->timeri->callback_data = (void *)tu;
1492 static int snd_timer_user_info(struct file *file, snd_timer_info_t __user *_info)
1494 snd_timer_user_t *tu;
1495 snd_timer_info_t info;
1498 tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO);
1499 snd_assert(tu->timeri != NULL, return -ENXIO);
1500 t = tu->timeri->timer;
1501 snd_assert(t != NULL, return -ENXIO);
1502 memset(&info, 0, sizeof(info));
1503 info.card = t->card ? t->card->number : -1;
1504 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1505 info.flags |= SNDRV_TIMER_FLG_SLAVE;
1506 strlcpy(info.id, t->id, sizeof(info.id));
1507 strlcpy(info.name, t->name, sizeof(info.name));
1508 info.resolution = t->hw.resolution;
1509 if (copy_to_user(_info, &info, sizeof(*_info)))
1514 static int snd_timer_user_params(struct file *file, snd_timer_params_t __user *_params)
1516 snd_timer_user_t *tu;
1517 snd_timer_params_t params;
1519 snd_timer_read_t *tr;
1520 snd_timer_tread_t *ttr;
1523 tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO);
1524 snd_assert(tu->timeri != NULL, return -ENXIO);
1525 t = tu->timeri->timer;
1526 snd_assert(t != NULL, return -ENXIO);
1527 if (copy_from_user(¶ms, _params, sizeof(params)))
1529 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1533 if (params.queue_size > 0 && (params.queue_size < 32 || params.queue_size > 1024)) {
1537 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1538 (1<<SNDRV_TIMER_EVENT_TICK)|
1539 (1<<SNDRV_TIMER_EVENT_START)|
1540 (1<<SNDRV_TIMER_EVENT_STOP)|
1541 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1542 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1543 (1<<SNDRV_TIMER_EVENT_MSTART)|
1544 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1545 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1546 (1<<SNDRV_TIMER_EVENT_MPAUSE))) {
1550 snd_timer_stop(tu->timeri);
1551 spin_lock_irq(&t->lock);
1552 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1553 SNDRV_TIMER_IFLG_EXCLUSIVE|
1554 SNDRV_TIMER_IFLG_EARLY_EVENT);
1555 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1556 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1557 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1558 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1559 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1560 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1561 spin_unlock_irq(&t->lock);
1562 if (params.queue_size > 0 && (unsigned int)tu->queue_size != params.queue_size) {
1564 ttr = (snd_timer_tread_t *)kmalloc(params.queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
1567 tu->queue_size = params.queue_size;
1571 tr = (snd_timer_read_t *)kmalloc(params.queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1574 tu->queue_size = params.queue_size;
1579 tu->qhead = tu->qtail = tu->qused = 0;
1580 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1582 snd_timer_tread_t tread;
1583 tread.event = SNDRV_TIMER_EVENT_EARLY;
1584 tread.tstamp.tv_sec = 0;
1585 tread.tstamp.tv_nsec = 0;
1587 snd_timer_user_append_to_tqueue(tu, &tread);
1589 snd_timer_read_t *r = &tu->queue[0];
1597 tu->filter = params.filter;
1598 tu->ticks = params.ticks;
1601 if (copy_to_user(_params, ¶ms, sizeof(params)))
1606 static int snd_timer_user_status(struct file *file, snd_timer_status_t __user *_status)
1608 snd_timer_user_t *tu;
1609 snd_timer_status_t status;
1611 tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO);
1612 snd_assert(tu->timeri != NULL, return -ENXIO);
1613 memset(&status, 0, sizeof(status));
1614 status.tstamp = tu->tstamp;
1615 status.resolution = snd_timer_resolution(tu->timeri);
1616 status.lost = tu->timeri->lost;
1617 status.overrun = tu->overrun;
1618 spin_lock_irq(&tu->qlock);
1619 status.queue = tu->qused;
1620 spin_unlock_irq(&tu->qlock);
1621 if (copy_to_user(_status, &status, sizeof(status)))
1626 static int snd_timer_user_start(struct file *file)
1629 snd_timer_user_t *tu;
1631 tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO);
1632 snd_assert(tu->timeri != NULL, return -ENXIO);
1633 snd_timer_stop(tu->timeri);
1634 tu->timeri->lost = 0;
1635 tu->last_resolution = 0;
1636 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1639 static int snd_timer_user_stop(struct file *file)
1642 snd_timer_user_t *tu;
1644 tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO);
1645 snd_assert(tu->timeri != NULL, return -ENXIO);
1646 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1649 static int snd_timer_user_continue(struct file *file)
1652 snd_timer_user_t *tu;
1654 tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO);
1655 snd_assert(tu->timeri != NULL, return -ENXIO);
1656 tu->timeri->lost = 0;
1657 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1660 static int snd_timer_user_ioctl(struct inode *inode, struct file *file,
1661 unsigned int cmd, unsigned long arg)
1663 snd_timer_user_t *tu;
1664 void __user *argp = (void __user *)arg;
1665 int __user *p = argp;
1667 tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO);
1669 case SNDRV_TIMER_IOCTL_PVERSION:
1670 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1671 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1672 return snd_timer_user_next_device(argp);
1673 case SNDRV_TIMER_IOCTL_TREAD:
1677 if (tu->timeri) /* too late */
1679 if (get_user(xarg, p))
1681 tu->tread = xarg ? 1 : 0;
1684 case SNDRV_TIMER_IOCTL_GINFO:
1685 return snd_timer_user_ginfo(file, argp);
1686 case SNDRV_TIMER_IOCTL_GPARAMS:
1687 return snd_timer_user_gparams(file, argp);
1688 case SNDRV_TIMER_IOCTL_GSTATUS:
1689 return snd_timer_user_gstatus(file, argp);
1690 case SNDRV_TIMER_IOCTL_SELECT:
1691 return snd_timer_user_tselect(file, argp);
1692 case SNDRV_TIMER_IOCTL_INFO:
1693 return snd_timer_user_info(file, argp);
1694 case SNDRV_TIMER_IOCTL_PARAMS:
1695 return snd_timer_user_params(file, argp);
1696 case SNDRV_TIMER_IOCTL_STATUS:
1697 return snd_timer_user_status(file, argp);
1698 case SNDRV_TIMER_IOCTL_START:
1699 return snd_timer_user_start(file);
1700 case SNDRV_TIMER_IOCTL_STOP:
1701 return snd_timer_user_stop(file);
1702 case SNDRV_TIMER_IOCTL_CONTINUE:
1703 return snd_timer_user_continue(file);
1708 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1710 snd_timer_user_t *tu;
1713 tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO);
1714 err = fasync_helper(fd, file, on, &tu->fasync);
1720 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
1722 snd_timer_user_t *tu;
1723 long result = 0, unit;
1726 tu = snd_magic_cast(snd_timer_user_t, file->private_data, return -ENXIO);
1727 unit = tu->tread ? sizeof(snd_timer_tread_t) : sizeof(snd_timer_read_t);
1728 spin_lock_irq(&tu->qlock);
1729 while ((long)count - result >= unit) {
1730 while (!tu->qused) {
1733 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1738 set_current_state(TASK_INTERRUPTIBLE);
1739 init_waitqueue_entry(&wait, current);
1740 add_wait_queue(&tu->qchange_sleep, &wait);
1742 spin_unlock_irq(&tu->qlock);
1744 spin_lock_irq(&tu->qlock);
1746 remove_wait_queue(&tu->qchange_sleep, &wait);
1748 if (signal_pending(current)) {
1754 spin_unlock_irq(&tu->qlock);
1759 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], sizeof(snd_timer_tread_t))) {
1764 if (copy_to_user(buffer, &tu->queue[tu->qhead++], sizeof(snd_timer_read_t))) {
1770 tu->qhead %= tu->queue_size;
1775 spin_lock_irq(&tu->qlock);
1778 spin_unlock_irq(&tu->qlock);
1780 return result > 0 ? result : err;
1783 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1786 snd_timer_user_t *tu;
1788 tu = snd_magic_cast(snd_timer_user_t, file->private_data, return 0);
1790 poll_wait(file, &tu->qchange_sleep, wait);
1794 mask |= POLLIN | POLLRDNORM;
1799 static struct file_operations snd_timer_f_ops =
1801 .owner = THIS_MODULE,
1802 .read = snd_timer_user_read,
1803 .open = snd_timer_user_open,
1804 .release = snd_timer_user_release,
1805 .poll = snd_timer_user_poll,
1806 .ioctl = snd_timer_user_ioctl,
1807 .fasync = snd_timer_user_fasync,
1810 static snd_minor_t snd_timer_reg =
1813 .f_ops = &snd_timer_f_ops,
1820 static snd_info_entry_t *snd_timer_proc_entry = NULL;
1822 static int __init alsa_timer_init(void)
1825 snd_info_entry_t *entry;
1827 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1828 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, "system timer");
1830 if ((entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL)) != NULL) {
1831 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128;
1832 entry->c.text.read = snd_timer_proc_read;
1833 if (snd_info_register(entry) < 0) {
1834 snd_info_free_entry(entry);
1838 snd_timer_proc_entry = entry;
1839 if ((err = snd_timer_register_system()) < 0)
1840 snd_printk(KERN_ERR "unable to register system timer (%i)\n", err);
1841 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER,
1842 NULL, 0, &snd_timer_reg, "timer"))<0)
1843 snd_printk(KERN_ERR "unable to register timer device (%i)\n", err);
1847 static void __exit alsa_timer_exit(void)
1849 struct list_head *p, *n;
1851 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1852 /* unregister the system timer */
1853 list_for_each_safe(p, n, &snd_timer_list) {
1854 snd_timer_t *timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1855 snd_timer_unregister(timer);
1857 if (snd_timer_proc_entry) {
1858 snd_info_unregister(snd_timer_proc_entry);
1859 snd_timer_proc_entry = NULL;
1861 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1862 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1866 module_init(alsa_timer_init)
1867 module_exit(alsa_timer_exit)
1869 EXPORT_SYMBOL(snd_timer_open);
1870 EXPORT_SYMBOL(snd_timer_close);
1871 EXPORT_SYMBOL(snd_timer_resolution);
1872 EXPORT_SYMBOL(snd_timer_start);
1873 EXPORT_SYMBOL(snd_timer_stop);
1874 EXPORT_SYMBOL(snd_timer_continue);
1875 EXPORT_SYMBOL(snd_timer_pause);
1876 EXPORT_SYMBOL(snd_timer_new);
1877 EXPORT_SYMBOL(snd_timer_notify);
1878 EXPORT_SYMBOL(snd_timer_global_new);
1879 EXPORT_SYMBOL(snd_timer_global_free);
1880 EXPORT_SYMBOL(snd_timer_global_register);
1881 EXPORT_SYMBOL(snd_timer_global_unregister);
1882 EXPORT_SYMBOL(snd_timer_interrupt);
1883 EXPORT_SYMBOL(snd_timer_system_resolution);