2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <linux/moduleparam.h>
28 #include <linux/string.h>
29 #include <sound/core.h>
30 #include <sound/timer.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33 #include <sound/minors.h>
34 #include <sound/initval.h>
35 #include <linux/kmod.h>
37 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
38 #define DEFAULT_TIMER_LIMIT 3
39 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
40 #define DEFAULT_TIMER_LIMIT 2
42 #define DEFAULT_TIMER_LIMIT 1
45 static int timer_limit
= DEFAULT_TIMER_LIMIT
;
46 static int timer_tstamp_monotonic
= 1;
47 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
48 MODULE_DESCRIPTION("ALSA timer interface");
49 MODULE_LICENSE("GPL");
50 module_param(timer_limit
, int, 0444);
51 MODULE_PARM_DESC(timer_limit
, "Maximum global timers in system.");
52 module_param(timer_tstamp_monotonic
, int, 0444);
53 MODULE_PARM_DESC(timer_tstamp_monotonic
, "Use posix monotonic clock source for timestamps (default).");
55 struct snd_timer_user
{
56 struct snd_timer_instance
*timeri
;
57 int tread
; /* enhanced read with timestamps and events */
59 unsigned long overrun
;
64 struct snd_timer_read
*queue
;
65 struct snd_timer_tread
*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 mutex 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 DEFINE_MUTEX(register_mutex
);
86 static int snd_timer_free(struct snd_timer
*timer
);
87 static int snd_timer_dev_free(struct snd_device
*device
);
88 static int snd_timer_dev_register(struct snd_device
*device
);
89 static int snd_timer_dev_disconnect(struct snd_device
*device
);
91 static void snd_timer_reschedule(struct snd_timer
* 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 struct snd_timer_instance
*snd_timer_instance_new(char *owner
,
98 struct snd_timer
*timer
)
100 struct snd_timer_instance
*timeri
;
101 timeri
= kzalloc(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
&& !try_module_get(timer
->module
)) {
117 kfree(timeri
->owner
);
126 * find a timer instance from the given timer id
128 static struct snd_timer
*snd_timer_find(struct snd_timer_id
*tid
)
130 struct snd_timer
*timer
= NULL
;
132 list_for_each_entry(timer
, &snd_timer_list
, device_list
) {
133 if (timer
->tmr_class
!= tid
->dev_class
)
135 if ((timer
->tmr_class
== SNDRV_TIMER_CLASS_CARD
||
136 timer
->tmr_class
== SNDRV_TIMER_CLASS_PCM
) &&
137 (timer
->card
== NULL
||
138 timer
->card
->number
!= tid
->card
))
140 if (timer
->tmr_device
!= tid
->device
)
142 if (timer
->tmr_subdevice
!= tid
->subdevice
)
149 #ifdef CONFIG_MODULES
151 static void snd_timer_request(struct snd_timer_id
*tid
)
153 switch (tid
->dev_class
) {
154 case SNDRV_TIMER_CLASS_GLOBAL
:
155 if (tid
->device
< timer_limit
)
156 request_module("snd-timer-%i", tid
->device
);
158 case SNDRV_TIMER_CLASS_CARD
:
159 case SNDRV_TIMER_CLASS_PCM
:
160 if (tid
->card
< snd_ecards_limit
)
161 request_module("snd-card-%i", tid
->card
);
171 * look for a master instance matching with the slave id of the given slave.
172 * when found, relink the open_link of the slave.
174 * call this with register_mutex down.
176 static void snd_timer_check_slave(struct snd_timer_instance
*slave
)
178 struct snd_timer
*timer
;
179 struct snd_timer_instance
*master
;
181 /* FIXME: it's really dumb to look up all entries.. */
182 list_for_each_entry(timer
, &snd_timer_list
, device_list
) {
183 list_for_each_entry(master
, &timer
->open_list_head
, open_list
) {
184 if (slave
->slave_class
== master
->slave_class
&&
185 slave
->slave_id
== master
->slave_id
) {
186 list_del(&slave
->open_list
);
187 list_add_tail(&slave
->open_list
,
188 &master
->slave_list_head
);
189 spin_lock_irq(&slave_active_lock
);
190 slave
->master
= master
;
191 slave
->timer
= master
->timer
;
192 spin_unlock_irq(&slave_active_lock
);
200 * look for slave instances matching with the slave id of the given master.
201 * when found, relink the open_link of slaves.
203 * call this with register_mutex down.
205 static void snd_timer_check_master(struct snd_timer_instance
*master
)
207 struct snd_timer_instance
*slave
, *tmp
;
209 /* check all pending slaves */
210 list_for_each_entry_safe(slave
, tmp
, &snd_timer_slave_list
, open_list
) {
211 if (slave
->slave_class
== master
->slave_class
&&
212 slave
->slave_id
== master
->slave_id
) {
213 list_move_tail(&slave
->open_list
, &master
->slave_list_head
);
214 spin_lock_irq(&slave_active_lock
);
215 slave
->master
= master
;
216 slave
->timer
= master
->timer
;
217 if (slave
->flags
& SNDRV_TIMER_IFLG_RUNNING
)
218 list_add_tail(&slave
->active_list
,
219 &master
->slave_active_head
);
220 spin_unlock_irq(&slave_active_lock
);
226 * open a timer instance
227 * when opening a master, the slave id must be here given.
229 int snd_timer_open(struct snd_timer_instance
**ti
,
230 char *owner
, struct snd_timer_id
*tid
,
231 unsigned int slave_id
)
233 struct snd_timer
*timer
;
234 struct snd_timer_instance
*timeri
= NULL
;
236 if (tid
->dev_class
== SNDRV_TIMER_CLASS_SLAVE
) {
237 /* open a slave instance */
238 if (tid
->dev_sclass
<= SNDRV_TIMER_SCLASS_NONE
||
239 tid
->dev_sclass
> SNDRV_TIMER_SCLASS_OSS_SEQUENCER
) {
240 snd_printd("invalid slave class %i\n", tid
->dev_sclass
);
243 mutex_lock(®ister_mutex
);
244 timeri
= snd_timer_instance_new(owner
, NULL
);
246 mutex_unlock(®ister_mutex
);
249 timeri
->slave_class
= tid
->dev_sclass
;
250 timeri
->slave_id
= tid
->device
;
251 timeri
->flags
|= SNDRV_TIMER_IFLG_SLAVE
;
252 list_add_tail(&timeri
->open_list
, &snd_timer_slave_list
);
253 snd_timer_check_slave(timeri
);
254 mutex_unlock(®ister_mutex
);
259 /* open a master instance */
260 mutex_lock(®ister_mutex
);
261 timer
= snd_timer_find(tid
);
262 #ifdef CONFIG_MODULES
264 mutex_unlock(®ister_mutex
);
265 snd_timer_request(tid
);
266 mutex_lock(®ister_mutex
);
267 timer
= snd_timer_find(tid
);
271 mutex_unlock(®ister_mutex
);
274 if (!list_empty(&timer
->open_list_head
)) {
275 timeri
= list_entry(timer
->open_list_head
.next
,
276 struct snd_timer_instance
, open_list
);
277 if (timeri
->flags
& SNDRV_TIMER_IFLG_EXCLUSIVE
) {
278 mutex_unlock(®ister_mutex
);
282 timeri
= snd_timer_instance_new(owner
, timer
);
284 mutex_unlock(®ister_mutex
);
287 timeri
->slave_class
= tid
->dev_sclass
;
288 timeri
->slave_id
= slave_id
;
289 if (list_empty(&timer
->open_list_head
) && timer
->hw
.open
)
290 timer
->hw
.open(timer
);
291 list_add_tail(&timeri
->open_list
, &timer
->open_list_head
);
292 snd_timer_check_master(timeri
);
293 mutex_unlock(®ister_mutex
);
298 static int _snd_timer_stop(struct snd_timer_instance
*timeri
,
299 int keep_flag
, int event
);
302 * close a timer instance
304 int snd_timer_close(struct snd_timer_instance
*timeri
)
306 struct snd_timer
*timer
= NULL
;
307 struct snd_timer_instance
*slave
, *tmp
;
309 if (snd_BUG_ON(!timeri
))
312 /* force to stop the timer */
313 snd_timer_stop(timeri
);
315 if (timeri
->flags
& SNDRV_TIMER_IFLG_SLAVE
) {
316 /* wait, until the active callback is finished */
317 spin_lock_irq(&slave_active_lock
);
318 while (timeri
->flags
& SNDRV_TIMER_IFLG_CALLBACK
) {
319 spin_unlock_irq(&slave_active_lock
);
321 spin_lock_irq(&slave_active_lock
);
323 spin_unlock_irq(&slave_active_lock
);
324 mutex_lock(®ister_mutex
);
325 list_del(&timeri
->open_list
);
326 mutex_unlock(®ister_mutex
);
328 timer
= timeri
->timer
;
329 /* wait, until the active callback is finished */
330 spin_lock_irq(&timer
->lock
);
331 while (timeri
->flags
& SNDRV_TIMER_IFLG_CALLBACK
) {
332 spin_unlock_irq(&timer
->lock
);
334 spin_lock_irq(&timer
->lock
);
336 spin_unlock_irq(&timer
->lock
);
337 mutex_lock(®ister_mutex
);
338 list_del(&timeri
->open_list
);
339 if (timer
&& list_empty(&timer
->open_list_head
) &&
341 timer
->hw
.close(timer
);
342 /* remove slave links */
343 list_for_each_entry_safe(slave
, tmp
, &timeri
->slave_list_head
,
345 spin_lock_irq(&slave_active_lock
);
346 _snd_timer_stop(slave
, 1, SNDRV_TIMER_EVENT_RESOLUTION
);
347 list_move_tail(&slave
->open_list
, &snd_timer_slave_list
);
348 slave
->master
= NULL
;
350 spin_unlock_irq(&slave_active_lock
);
352 mutex_unlock(®ister_mutex
);
354 if (timeri
->private_free
)
355 timeri
->private_free(timeri
);
356 kfree(timeri
->owner
);
359 module_put(timer
->module
);
363 unsigned long snd_timer_resolution(struct snd_timer_instance
*timeri
)
365 struct snd_timer
* timer
;
369 if ((timer
= timeri
->timer
) != NULL
) {
370 if (timer
->hw
.c_resolution
)
371 return timer
->hw
.c_resolution(timer
);
372 return timer
->hw
.resolution
;
377 static void snd_timer_notify1(struct snd_timer_instance
*ti
, int event
)
379 struct snd_timer
*timer
;
381 unsigned long resolution
= 0;
382 struct snd_timer_instance
*ts
;
383 struct timespec tstamp
;
385 if (timer_tstamp_monotonic
)
386 do_posix_clock_monotonic_gettime(&tstamp
);
388 getnstimeofday(&tstamp
);
389 if (snd_BUG_ON(event
< SNDRV_TIMER_EVENT_START
||
390 event
> SNDRV_TIMER_EVENT_PAUSE
))
392 if (event
== SNDRV_TIMER_EVENT_START
||
393 event
== SNDRV_TIMER_EVENT_CONTINUE
)
394 resolution
= snd_timer_resolution(ti
);
396 ti
->ccallback(ti
, SNDRV_TIMER_EVENT_START
, &tstamp
, resolution
);
397 if (ti
->flags
& SNDRV_TIMER_IFLG_SLAVE
)
402 if (timer
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)
404 spin_lock_irqsave(&timer
->lock
, flags
);
405 list_for_each_entry(ts
, &ti
->slave_active_head
, active_list
)
407 ts
->ccallback(ti
, event
+ 100, &tstamp
, resolution
);
408 spin_unlock_irqrestore(&timer
->lock
, flags
);
411 static int snd_timer_start1(struct snd_timer
*timer
, struct snd_timer_instance
*timeri
,
412 unsigned long sticks
)
414 list_del(&timeri
->active_list
);
415 list_add_tail(&timeri
->active_list
, &timer
->active_list_head
);
416 if (timer
->running
) {
417 if (timer
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)
419 timer
->flags
|= SNDRV_TIMER_FLG_RESCHED
;
420 timeri
->flags
|= SNDRV_TIMER_IFLG_START
;
421 return 1; /* delayed start */
423 timer
->sticks
= sticks
;
424 timer
->hw
.start(timer
);
427 timeri
->flags
|= SNDRV_TIMER_IFLG_RUNNING
;
432 static int snd_timer_start_slave(struct snd_timer_instance
*timeri
)
436 spin_lock_irqsave(&slave_active_lock
, flags
);
437 timeri
->flags
|= SNDRV_TIMER_IFLG_RUNNING
;
439 list_add_tail(&timeri
->active_list
,
440 &timeri
->master
->slave_active_head
);
441 spin_unlock_irqrestore(&slave_active_lock
, flags
);
442 return 1; /* delayed start */
446 * start the timer instance
448 int snd_timer_start(struct snd_timer_instance
*timeri
, unsigned int ticks
)
450 struct snd_timer
*timer
;
451 int result
= -EINVAL
;
454 if (timeri
== NULL
|| ticks
< 1)
456 if (timeri
->flags
& SNDRV_TIMER_IFLG_SLAVE
) {
457 result
= snd_timer_start_slave(timeri
);
458 snd_timer_notify1(timeri
, SNDRV_TIMER_EVENT_START
);
461 timer
= timeri
->timer
;
464 spin_lock_irqsave(&timer
->lock
, flags
);
465 timeri
->ticks
= timeri
->cticks
= ticks
;
467 result
= snd_timer_start1(timer
, timeri
, ticks
);
468 spin_unlock_irqrestore(&timer
->lock
, flags
);
469 snd_timer_notify1(timeri
, SNDRV_TIMER_EVENT_START
);
473 static int _snd_timer_stop(struct snd_timer_instance
* timeri
,
474 int keep_flag
, int event
)
476 struct snd_timer
*timer
;
479 if (snd_BUG_ON(!timeri
))
482 if (timeri
->flags
& SNDRV_TIMER_IFLG_SLAVE
) {
484 spin_lock_irqsave(&slave_active_lock
, flags
);
485 timeri
->flags
&= ~SNDRV_TIMER_IFLG_RUNNING
;
486 spin_unlock_irqrestore(&slave_active_lock
, flags
);
490 timer
= timeri
->timer
;
493 spin_lock_irqsave(&timer
->lock
, flags
);
494 list_del_init(&timeri
->ack_list
);
495 list_del_init(&timeri
->active_list
);
496 if ((timeri
->flags
& SNDRV_TIMER_IFLG_RUNNING
) &&
497 !(--timer
->running
)) {
498 timer
->hw
.stop(timer
);
499 if (timer
->flags
& SNDRV_TIMER_FLG_RESCHED
) {
500 timer
->flags
&= ~SNDRV_TIMER_FLG_RESCHED
;
501 snd_timer_reschedule(timer
, 0);
502 if (timer
->flags
& SNDRV_TIMER_FLG_CHANGE
) {
503 timer
->flags
&= ~SNDRV_TIMER_FLG_CHANGE
;
504 timer
->hw
.start(timer
);
510 ~(SNDRV_TIMER_IFLG_RUNNING
| SNDRV_TIMER_IFLG_START
);
511 spin_unlock_irqrestore(&timer
->lock
, flags
);
513 if (event
!= SNDRV_TIMER_EVENT_RESOLUTION
)
514 snd_timer_notify1(timeri
, event
);
519 * stop the timer instance.
521 * do not call this from the timer callback!
523 int snd_timer_stop(struct snd_timer_instance
*timeri
)
525 struct snd_timer
*timer
;
529 err
= _snd_timer_stop(timeri
, 0, SNDRV_TIMER_EVENT_STOP
);
532 timer
= timeri
->timer
;
533 spin_lock_irqsave(&timer
->lock
, flags
);
534 timeri
->cticks
= timeri
->ticks
;
536 spin_unlock_irqrestore(&timer
->lock
, flags
);
541 * start again.. the tick is kept.
543 int snd_timer_continue(struct snd_timer_instance
*timeri
)
545 struct snd_timer
*timer
;
546 int result
= -EINVAL
;
551 if (timeri
->flags
& SNDRV_TIMER_IFLG_SLAVE
)
552 return snd_timer_start_slave(timeri
);
553 timer
= timeri
->timer
;
556 spin_lock_irqsave(&timer
->lock
, flags
);
560 result
= snd_timer_start1(timer
, timeri
, timer
->sticks
);
561 spin_unlock_irqrestore(&timer
->lock
, flags
);
562 snd_timer_notify1(timeri
, SNDRV_TIMER_EVENT_CONTINUE
);
567 * pause.. remember the ticks left
569 int snd_timer_pause(struct snd_timer_instance
* timeri
)
571 return _snd_timer_stop(timeri
, 0, SNDRV_TIMER_EVENT_PAUSE
);
575 * reschedule the timer
577 * start pending instances and check the scheduling ticks.
578 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
580 static void snd_timer_reschedule(struct snd_timer
* timer
, unsigned long ticks_left
)
582 struct snd_timer_instance
*ti
;
583 unsigned long ticks
= ~0UL;
585 list_for_each_entry(ti
, &timer
->active_list_head
, active_list
) {
586 if (ti
->flags
& SNDRV_TIMER_IFLG_START
) {
587 ti
->flags
&= ~SNDRV_TIMER_IFLG_START
;
588 ti
->flags
|= SNDRV_TIMER_IFLG_RUNNING
;
591 if (ti
->flags
& SNDRV_TIMER_IFLG_RUNNING
) {
592 if (ticks
> ti
->cticks
)
597 timer
->flags
&= ~SNDRV_TIMER_FLG_RESCHED
;
600 if (ticks
> timer
->hw
.ticks
)
601 ticks
= timer
->hw
.ticks
;
602 if (ticks_left
!= ticks
)
603 timer
->flags
|= SNDRV_TIMER_FLG_CHANGE
;
604 timer
->sticks
= ticks
;
611 static void snd_timer_tasklet(unsigned long arg
)
613 struct snd_timer
*timer
= (struct snd_timer
*) arg
;
614 struct snd_timer_instance
*ti
;
616 unsigned long resolution
, ticks
;
619 spin_lock_irqsave(&timer
->lock
, flags
);
620 /* now process all callbacks */
621 while (!list_empty(&timer
->sack_list_head
)) {
622 p
= timer
->sack_list_head
.next
; /* get first item */
623 ti
= list_entry(p
, struct snd_timer_instance
, ack_list
);
625 /* remove from ack_list and make empty */
630 resolution
= ti
->resolution
;
632 ti
->flags
|= SNDRV_TIMER_IFLG_CALLBACK
;
633 spin_unlock(&timer
->lock
);
635 ti
->callback(ti
, resolution
, ticks
);
636 spin_lock(&timer
->lock
);
637 ti
->flags
&= ~SNDRV_TIMER_IFLG_CALLBACK
;
639 spin_unlock_irqrestore(&timer
->lock
, flags
);
645 * ticks_left is usually equal to timer->sticks.
648 void snd_timer_interrupt(struct snd_timer
* timer
, unsigned long ticks_left
)
650 struct snd_timer_instance
*ti
, *ts
, *tmp
;
651 unsigned long resolution
, ticks
;
652 struct list_head
*p
, *ack_list_head
;
659 spin_lock_irqsave(&timer
->lock
, flags
);
661 /* remember the current resolution */
662 if (timer
->hw
.c_resolution
)
663 resolution
= timer
->hw
.c_resolution(timer
);
665 resolution
= timer
->hw
.resolution
;
667 /* loop for all active instances
668 * Here we cannot use list_for_each_entry because the active_list of a
669 * processed instance is relinked to done_list_head before the callback
672 list_for_each_entry_safe(ti
, tmp
, &timer
->active_list_head
,
674 if (!(ti
->flags
& SNDRV_TIMER_IFLG_RUNNING
))
676 ti
->pticks
+= ticks_left
;
677 ti
->resolution
= resolution
;
678 if (ti
->cticks
< ticks_left
)
681 ti
->cticks
-= ticks_left
;
682 if (ti
->cticks
) /* not expired */
684 if (ti
->flags
& SNDRV_TIMER_IFLG_AUTO
) {
685 ti
->cticks
= ti
->ticks
;
687 ti
->flags
&= ~SNDRV_TIMER_IFLG_RUNNING
;
688 if (--timer
->running
)
689 list_del(&ti
->active_list
);
691 if ((timer
->hw
.flags
& SNDRV_TIMER_HW_TASKLET
) ||
692 (ti
->flags
& SNDRV_TIMER_IFLG_FAST
))
693 ack_list_head
= &timer
->ack_list_head
;
695 ack_list_head
= &timer
->sack_list_head
;
696 if (list_empty(&ti
->ack_list
))
697 list_add_tail(&ti
->ack_list
, ack_list_head
);
698 list_for_each_entry(ts
, &ti
->slave_active_head
, active_list
) {
699 ts
->pticks
= ti
->pticks
;
700 ts
->resolution
= resolution
;
701 if (list_empty(&ts
->ack_list
))
702 list_add_tail(&ts
->ack_list
, ack_list_head
);
705 if (timer
->flags
& SNDRV_TIMER_FLG_RESCHED
)
706 snd_timer_reschedule(timer
, timer
->sticks
);
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
= list_entry(p
, struct snd_timer_instance
, 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_irqrestore(&timer
->lock
, flags
);
746 tasklet_hi_schedule(&timer
->task_queue
);
753 int snd_timer_new(struct snd_card
*card
, char *id
, struct snd_timer_id
*tid
,
754 struct snd_timer
**rtimer
)
756 struct snd_timer
*timer
;
758 static struct snd_device_ops ops
= {
759 .dev_free
= snd_timer_dev_free
,
760 .dev_register
= snd_timer_dev_register
,
761 .dev_disconnect
= snd_timer_dev_disconnect
,
764 if (snd_BUG_ON(!tid
))
768 timer
= kzalloc(sizeof(*timer
), GFP_KERNEL
);
770 snd_printk(KERN_ERR
"timer: cannot allocate\n");
773 timer
->tmr_class
= tid
->dev_class
;
775 timer
->tmr_device
= tid
->device
;
776 timer
->tmr_subdevice
= tid
->subdevice
;
778 strlcpy(timer
->id
, id
, sizeof(timer
->id
));
779 INIT_LIST_HEAD(&timer
->device_list
);
780 INIT_LIST_HEAD(&timer
->open_list_head
);
781 INIT_LIST_HEAD(&timer
->active_list_head
);
782 INIT_LIST_HEAD(&timer
->ack_list_head
);
783 INIT_LIST_HEAD(&timer
->sack_list_head
);
784 spin_lock_init(&timer
->lock
);
785 tasklet_init(&timer
->task_queue
, snd_timer_tasklet
,
786 (unsigned long)timer
);
788 timer
->module
= card
->module
;
789 err
= snd_device_new(card
, SNDRV_DEV_TIMER
, timer
, &ops
);
791 snd_timer_free(timer
);
800 static int snd_timer_free(struct snd_timer
*timer
)
805 mutex_lock(®ister_mutex
);
806 if (! list_empty(&timer
->open_list_head
)) {
807 struct list_head
*p
, *n
;
808 struct snd_timer_instance
*ti
;
809 snd_printk(KERN_WARNING
"timer %p is busy?\n", timer
);
810 list_for_each_safe(p
, n
, &timer
->open_list_head
) {
812 ti
= list_entry(p
, struct snd_timer_instance
, open_list
);
816 list_del(&timer
->device_list
);
817 mutex_unlock(®ister_mutex
);
819 if (timer
->private_free
)
820 timer
->private_free(timer
);
825 static int snd_timer_dev_free(struct snd_device
*device
)
827 struct snd_timer
*timer
= device
->device_data
;
828 return snd_timer_free(timer
);
831 static int snd_timer_dev_register(struct snd_device
*dev
)
833 struct snd_timer
*timer
= dev
->device_data
;
834 struct snd_timer
*timer1
;
836 if (snd_BUG_ON(!timer
|| !timer
->hw
.start
|| !timer
->hw
.stop
))
838 if (!(timer
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
) &&
839 !timer
->hw
.resolution
&& timer
->hw
.c_resolution
== NULL
)
842 mutex_lock(®ister_mutex
);
843 list_for_each_entry(timer1
, &snd_timer_list
, device_list
) {
844 if (timer1
->tmr_class
> timer
->tmr_class
)
846 if (timer1
->tmr_class
< timer
->tmr_class
)
848 if (timer1
->card
&& timer
->card
) {
849 if (timer1
->card
->number
> timer
->card
->number
)
851 if (timer1
->card
->number
< timer
->card
->number
)
854 if (timer1
->tmr_device
> timer
->tmr_device
)
856 if (timer1
->tmr_device
< timer
->tmr_device
)
858 if (timer1
->tmr_subdevice
> timer
->tmr_subdevice
)
860 if (timer1
->tmr_subdevice
< timer
->tmr_subdevice
)
863 mutex_unlock(®ister_mutex
);
866 list_add_tail(&timer
->device_list
, &timer1
->device_list
);
867 mutex_unlock(®ister_mutex
);
871 static int snd_timer_dev_disconnect(struct snd_device
*device
)
873 struct snd_timer
*timer
= device
->device_data
;
874 mutex_lock(®ister_mutex
);
875 list_del_init(&timer
->device_list
);
876 mutex_unlock(®ister_mutex
);
880 void snd_timer_notify(struct snd_timer
*timer
, int event
, struct timespec
*tstamp
)
883 unsigned long resolution
= 0;
884 struct snd_timer_instance
*ti
, *ts
;
886 if (! (timer
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
))
888 if (snd_BUG_ON(event
< SNDRV_TIMER_EVENT_MSTART
||
889 event
> SNDRV_TIMER_EVENT_MRESUME
))
891 spin_lock_irqsave(&timer
->lock
, flags
);
892 if (event
== SNDRV_TIMER_EVENT_MSTART
||
893 event
== SNDRV_TIMER_EVENT_MCONTINUE
||
894 event
== SNDRV_TIMER_EVENT_MRESUME
) {
895 if (timer
->hw
.c_resolution
)
896 resolution
= timer
->hw
.c_resolution(timer
);
898 resolution
= timer
->hw
.resolution
;
900 list_for_each_entry(ti
, &timer
->active_list_head
, active_list
) {
902 ti
->ccallback(ti
, event
, tstamp
, resolution
);
903 list_for_each_entry(ts
, &ti
->slave_active_head
, active_list
)
905 ts
->ccallback(ts
, event
, tstamp
, resolution
);
907 spin_unlock_irqrestore(&timer
->lock
, flags
);
911 * exported functions for global timers
913 int snd_timer_global_new(char *id
, int device
, struct snd_timer
**rtimer
)
915 struct snd_timer_id tid
;
917 tid
.dev_class
= SNDRV_TIMER_CLASS_GLOBAL
;
918 tid
.dev_sclass
= SNDRV_TIMER_SCLASS_NONE
;
922 return snd_timer_new(NULL
, id
, &tid
, rtimer
);
925 int snd_timer_global_free(struct snd_timer
*timer
)
927 return snd_timer_free(timer
);
930 int snd_timer_global_register(struct snd_timer
*timer
)
932 struct snd_device dev
;
934 memset(&dev
, 0, sizeof(dev
));
935 dev
.device_data
= timer
;
936 return snd_timer_dev_register(&dev
);
943 struct snd_timer_system_private
{
944 struct timer_list tlist
;
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 struct snd_timer
*timer
= (struct snd_timer
*)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(struct snd_timer
* 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
= 0;
974 priv
->last_expires
= priv
->tlist
.expires
= njiff
;
975 add_timer(&priv
->tlist
);
979 static int snd_timer_s_stop(struct snd_timer
* 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
;
991 priv
->correction
= 0;
995 static struct snd_timer_hardware snd_timer_system
=
997 .flags
= SNDRV_TIMER_HW_FIRST
| SNDRV_TIMER_HW_TASKLET
,
998 .resolution
= 1000000000L / HZ
,
1000 .start
= snd_timer_s_start
,
1001 .stop
= snd_timer_s_stop
1004 static void snd_timer_free_system(struct snd_timer
*timer
)
1006 kfree(timer
->private_data
);
1009 static int snd_timer_register_system(void)
1011 struct snd_timer
*timer
;
1012 struct snd_timer_system_private
*priv
;
1015 err
= snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM
, &timer
);
1018 strcpy(timer
->name
, "system timer");
1019 timer
->hw
= snd_timer_system
;
1020 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
1022 snd_timer_free(timer
);
1025 init_timer(&priv
->tlist
);
1026 priv
->tlist
.function
= snd_timer_s_function
;
1027 priv
->tlist
.data
= (unsigned long) timer
;
1028 timer
->private_data
= priv
;
1029 timer
->private_free
= snd_timer_free_system
;
1030 return snd_timer_global_register(timer
);
1033 #ifdef CONFIG_PROC_FS
1038 static void snd_timer_proc_read(struct snd_info_entry
*entry
,
1039 struct snd_info_buffer
*buffer
)
1041 struct snd_timer
*timer
;
1042 struct snd_timer_instance
*ti
;
1044 mutex_lock(®ister_mutex
);
1045 list_for_each_entry(timer
, &snd_timer_list
, 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: ",
1052 timer
->card
->number
, timer
->tmr_device
);
1054 case SNDRV_TIMER_CLASS_PCM
:
1055 snd_iprintf(buffer
, "P%i-%i-%i: ", timer
->card
->number
,
1056 timer
->tmr_device
, timer
->tmr_subdevice
);
1059 snd_iprintf(buffer
, "?%i-%i-%i-%i: ", timer
->tmr_class
,
1060 timer
->card
? timer
->card
->number
: -1,
1061 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)",
1066 timer
->hw
.resolution
/ 1000,
1067 timer
->hw
.resolution
% 1000,
1069 if (timer
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)
1070 snd_iprintf(buffer
, " SLAVE");
1071 snd_iprintf(buffer
, "\n");
1072 list_for_each_entry(ti
, &timer
->open_list_head
, open_list
)
1073 snd_iprintf(buffer
, " Client %s : %s\n",
1074 ti
->owner
? ti
->owner
: "unknown",
1075 ti
->flags
& (SNDRV_TIMER_IFLG_START
|
1076 SNDRV_TIMER_IFLG_RUNNING
)
1077 ? "running" : "stopped");
1079 mutex_unlock(®ister_mutex
);
1082 static struct snd_info_entry
*snd_timer_proc_entry
;
1084 static void __init
snd_timer_proc_init(void)
1086 struct snd_info_entry
*entry
;
1088 entry
= snd_info_create_module_entry(THIS_MODULE
, "timers", NULL
);
1089 if (entry
!= NULL
) {
1090 entry
->c
.text
.read
= snd_timer_proc_read
;
1091 if (snd_info_register(entry
) < 0) {
1092 snd_info_free_entry(entry
);
1096 snd_timer_proc_entry
= entry
;
1099 static void __exit
snd_timer_proc_done(void)
1101 snd_info_free_entry(snd_timer_proc_entry
);
1103 #else /* !CONFIG_PROC_FS */
1104 #define snd_timer_proc_init()
1105 #define snd_timer_proc_done()
1109 * USER SPACE interface
1112 static void snd_timer_user_interrupt(struct snd_timer_instance
*timeri
,
1113 unsigned long resolution
,
1114 unsigned long ticks
)
1116 struct snd_timer_user
*tu
= timeri
->callback_data
;
1117 struct snd_timer_read
*r
;
1120 spin_lock(&tu
->qlock
);
1121 if (tu
->qused
> 0) {
1122 prev
= tu
->qtail
== 0 ? tu
->queue_size
- 1 : tu
->qtail
- 1;
1123 r
= &tu
->queue
[prev
];
1124 if (r
->resolution
== resolution
) {
1129 if (tu
->qused
>= tu
->queue_size
) {
1132 r
= &tu
->queue
[tu
->qtail
++];
1133 tu
->qtail
%= tu
->queue_size
;
1134 r
->resolution
= resolution
;
1139 spin_unlock(&tu
->qlock
);
1140 kill_fasync(&tu
->fasync
, SIGIO
, POLL_IN
);
1141 wake_up(&tu
->qchange_sleep
);
1144 static void snd_timer_user_append_to_tqueue(struct snd_timer_user
*tu
,
1145 struct snd_timer_tread
*tread
)
1147 if (tu
->qused
>= tu
->queue_size
) {
1150 memcpy(&tu
->tqueue
[tu
->qtail
++], tread
, sizeof(*tread
));
1151 tu
->qtail
%= tu
->queue_size
;
1156 static void snd_timer_user_ccallback(struct snd_timer_instance
*timeri
,
1158 struct timespec
*tstamp
,
1159 unsigned long resolution
)
1161 struct snd_timer_user
*tu
= timeri
->callback_data
;
1162 struct snd_timer_tread r1
;
1164 if (event
>= SNDRV_TIMER_EVENT_START
&&
1165 event
<= SNDRV_TIMER_EVENT_PAUSE
)
1166 tu
->tstamp
= *tstamp
;
1167 if ((tu
->filter
& (1 << event
)) == 0 || !tu
->tread
)
1170 r1
.tstamp
= *tstamp
;
1171 r1
.val
= resolution
;
1172 spin_lock(&tu
->qlock
);
1173 snd_timer_user_append_to_tqueue(tu
, &r1
);
1174 spin_unlock(&tu
->qlock
);
1175 kill_fasync(&tu
->fasync
, SIGIO
, POLL_IN
);
1176 wake_up(&tu
->qchange_sleep
);
1179 static void snd_timer_user_tinterrupt(struct snd_timer_instance
*timeri
,
1180 unsigned long resolution
,
1181 unsigned long ticks
)
1183 struct snd_timer_user
*tu
= timeri
->callback_data
;
1184 struct snd_timer_tread
*r
, r1
;
1185 struct timespec tstamp
;
1186 int prev
, append
= 0;
1188 memset(&tstamp
, 0, sizeof(tstamp
));
1189 spin_lock(&tu
->qlock
);
1190 if ((tu
->filter
& ((1 << SNDRV_TIMER_EVENT_RESOLUTION
) |
1191 (1 << SNDRV_TIMER_EVENT_TICK
))) == 0) {
1192 spin_unlock(&tu
->qlock
);
1195 if (tu
->last_resolution
!= resolution
|| ticks
> 0) {
1196 if (timer_tstamp_monotonic
)
1197 do_posix_clock_monotonic_gettime(&tstamp
);
1199 getnstimeofday(&tstamp
);
1201 if ((tu
->filter
& (1 << SNDRV_TIMER_EVENT_RESOLUTION
)) &&
1202 tu
->last_resolution
!= resolution
) {
1203 r1
.event
= SNDRV_TIMER_EVENT_RESOLUTION
;
1205 r1
.val
= resolution
;
1206 snd_timer_user_append_to_tqueue(tu
, &r1
);
1207 tu
->last_resolution
= resolution
;
1210 if ((tu
->filter
& (1 << SNDRV_TIMER_EVENT_TICK
)) == 0)
1214 if (tu
->qused
> 0) {
1215 prev
= tu
->qtail
== 0 ? tu
->queue_size
- 1 : tu
->qtail
- 1;
1216 r
= &tu
->tqueue
[prev
];
1217 if (r
->event
== SNDRV_TIMER_EVENT_TICK
) {
1224 r1
.event
= SNDRV_TIMER_EVENT_TICK
;
1227 snd_timer_user_append_to_tqueue(tu
, &r1
);
1230 spin_unlock(&tu
->qlock
);
1233 kill_fasync(&tu
->fasync
, SIGIO
, POLL_IN
);
1234 wake_up(&tu
->qchange_sleep
);
1237 static int snd_timer_user_open(struct inode
*inode
, struct file
*file
)
1239 struct snd_timer_user
*tu
;
1241 tu
= kzalloc(sizeof(*tu
), GFP_KERNEL
);
1244 spin_lock_init(&tu
->qlock
);
1245 init_waitqueue_head(&tu
->qchange_sleep
);
1246 mutex_init(&tu
->tread_sem
);
1248 tu
->queue_size
= 128;
1249 tu
->queue
= kmalloc(tu
->queue_size
* sizeof(struct snd_timer_read
),
1251 if (tu
->queue
== NULL
) {
1255 file
->private_data
= tu
;
1259 static int snd_timer_user_release(struct inode
*inode
, struct file
*file
)
1261 struct snd_timer_user
*tu
;
1263 if (file
->private_data
) {
1264 tu
= file
->private_data
;
1265 file
->private_data
= NULL
;
1267 snd_timer_close(tu
->timeri
);
1275 static void snd_timer_user_zero_id(struct snd_timer_id
*id
)
1277 id
->dev_class
= SNDRV_TIMER_CLASS_NONE
;
1278 id
->dev_sclass
= SNDRV_TIMER_SCLASS_NONE
;
1284 static void snd_timer_user_copy_id(struct snd_timer_id
*id
, struct snd_timer
*timer
)
1286 id
->dev_class
= timer
->tmr_class
;
1287 id
->dev_sclass
= SNDRV_TIMER_SCLASS_NONE
;
1288 id
->card
= timer
->card
? timer
->card
->number
: -1;
1289 id
->device
= timer
->tmr_device
;
1290 id
->subdevice
= timer
->tmr_subdevice
;
1293 static int snd_timer_user_next_device(struct snd_timer_id __user
*_tid
)
1295 struct snd_timer_id id
;
1296 struct snd_timer
*timer
;
1297 struct list_head
*p
;
1299 if (copy_from_user(&id
, _tid
, sizeof(id
)))
1301 mutex_lock(®ister_mutex
);
1302 if (id
.dev_class
< 0) { /* first item */
1303 if (list_empty(&snd_timer_list
))
1304 snd_timer_user_zero_id(&id
);
1306 timer
= list_entry(snd_timer_list
.next
,
1307 struct snd_timer
, device_list
);
1308 snd_timer_user_copy_id(&id
, timer
);
1311 switch (id
.dev_class
) {
1312 case SNDRV_TIMER_CLASS_GLOBAL
:
1313 id
.device
= id
.device
< 0 ? 0 : id
.device
+ 1;
1314 list_for_each(p
, &snd_timer_list
) {
1315 timer
= list_entry(p
, struct snd_timer
, device_list
);
1316 if (timer
->tmr_class
> SNDRV_TIMER_CLASS_GLOBAL
) {
1317 snd_timer_user_copy_id(&id
, timer
);
1320 if (timer
->tmr_device
>= id
.device
) {
1321 snd_timer_user_copy_id(&id
, timer
);
1325 if (p
== &snd_timer_list
)
1326 snd_timer_user_zero_id(&id
);
1328 case SNDRV_TIMER_CLASS_CARD
:
1329 case SNDRV_TIMER_CLASS_PCM
:
1336 if (id
.device
< 0) {
1339 if (id
.subdevice
< 0) {
1347 list_for_each(p
, &snd_timer_list
) {
1348 timer
= list_entry(p
, struct snd_timer
, device_list
);
1349 if (timer
->tmr_class
> id
.dev_class
) {
1350 snd_timer_user_copy_id(&id
, timer
);
1353 if (timer
->tmr_class
< id
.dev_class
)
1355 if (timer
->card
->number
> id
.card
) {
1356 snd_timer_user_copy_id(&id
, timer
);
1359 if (timer
->card
->number
< id
.card
)
1361 if (timer
->tmr_device
> id
.device
) {
1362 snd_timer_user_copy_id(&id
, timer
);
1365 if (timer
->tmr_device
< id
.device
)
1367 if (timer
->tmr_subdevice
> id
.subdevice
) {
1368 snd_timer_user_copy_id(&id
, timer
);
1371 if (timer
->tmr_subdevice
< id
.subdevice
)
1373 snd_timer_user_copy_id(&id
, timer
);
1376 if (p
== &snd_timer_list
)
1377 snd_timer_user_zero_id(&id
);
1380 snd_timer_user_zero_id(&id
);
1383 mutex_unlock(®ister_mutex
);
1384 if (copy_to_user(_tid
, &id
, sizeof(*_tid
)))
1389 static int snd_timer_user_ginfo(struct file
*file
,
1390 struct snd_timer_ginfo __user
*_ginfo
)
1392 struct snd_timer_ginfo
*ginfo
;
1393 struct snd_timer_id tid
;
1394 struct snd_timer
*t
;
1395 struct list_head
*p
;
1398 ginfo
= kmalloc(sizeof(*ginfo
), GFP_KERNEL
);
1401 if (copy_from_user(ginfo
, _ginfo
, sizeof(*ginfo
))) {
1406 memset(ginfo
, 0, sizeof(*ginfo
));
1408 mutex_lock(®ister_mutex
);
1409 t
= snd_timer_find(&tid
);
1411 ginfo
->card
= t
->card
? t
->card
->number
: -1;
1412 if (t
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)
1413 ginfo
->flags
|= SNDRV_TIMER_FLG_SLAVE
;
1414 strlcpy(ginfo
->id
, t
->id
, sizeof(ginfo
->id
));
1415 strlcpy(ginfo
->name
, t
->name
, sizeof(ginfo
->name
));
1416 ginfo
->resolution
= t
->hw
.resolution
;
1417 if (t
->hw
.resolution_min
> 0) {
1418 ginfo
->resolution_min
= t
->hw
.resolution_min
;
1419 ginfo
->resolution_max
= t
->hw
.resolution_max
;
1421 list_for_each(p
, &t
->open_list_head
) {
1427 mutex_unlock(®ister_mutex
);
1428 if (err
>= 0 && copy_to_user(_ginfo
, ginfo
, sizeof(*ginfo
)))
1434 static int snd_timer_user_gparams(struct file
*file
,
1435 struct snd_timer_gparams __user
*_gparams
)
1437 struct snd_timer_gparams gparams
;
1438 struct snd_timer
*t
;
1441 if (copy_from_user(&gparams
, _gparams
, sizeof(gparams
)))
1443 mutex_lock(®ister_mutex
);
1444 t
= snd_timer_find(&gparams
.tid
);
1449 if (!list_empty(&t
->open_list_head
)) {
1453 if (!t
->hw
.set_period
) {
1457 err
= t
->hw
.set_period(t
, gparams
.period_num
, gparams
.period_den
);
1459 mutex_unlock(®ister_mutex
);
1463 static int snd_timer_user_gstatus(struct file
*file
,
1464 struct snd_timer_gstatus __user
*_gstatus
)
1466 struct snd_timer_gstatus gstatus
;
1467 struct snd_timer_id tid
;
1468 struct snd_timer
*t
;
1471 if (copy_from_user(&gstatus
, _gstatus
, sizeof(gstatus
)))
1474 memset(&gstatus
, 0, sizeof(gstatus
));
1476 mutex_lock(®ister_mutex
);
1477 t
= snd_timer_find(&tid
);
1479 if (t
->hw
.c_resolution
)
1480 gstatus
.resolution
= t
->hw
.c_resolution(t
);
1482 gstatus
.resolution
= t
->hw
.resolution
;
1483 if (t
->hw
.precise_resolution
) {
1484 t
->hw
.precise_resolution(t
, &gstatus
.resolution_num
,
1485 &gstatus
.resolution_den
);
1487 gstatus
.resolution_num
= gstatus
.resolution
;
1488 gstatus
.resolution_den
= 1000000000uL;
1493 mutex_unlock(®ister_mutex
);
1494 if (err
>= 0 && copy_to_user(_gstatus
, &gstatus
, sizeof(gstatus
)))
1499 static int snd_timer_user_tselect(struct file
*file
,
1500 struct snd_timer_select __user
*_tselect
)
1502 struct snd_timer_user
*tu
;
1503 struct snd_timer_select tselect
;
1507 tu
= file
->private_data
;
1508 mutex_lock(&tu
->tread_sem
);
1510 snd_timer_close(tu
->timeri
);
1513 if (copy_from_user(&tselect
, _tselect
, sizeof(tselect
))) {
1517 sprintf(str
, "application %i", current
->pid
);
1518 if (tselect
.id
.dev_class
!= SNDRV_TIMER_CLASS_SLAVE
)
1519 tselect
.id
.dev_sclass
= SNDRV_TIMER_SCLASS_APPLICATION
;
1520 err
= snd_timer_open(&tu
->timeri
, str
, &tselect
.id
, current
->pid
);
1529 tu
->tqueue
= kmalloc(tu
->queue_size
* sizeof(struct snd_timer_tread
),
1531 if (tu
->tqueue
== NULL
)
1534 tu
->queue
= kmalloc(tu
->queue_size
* sizeof(struct snd_timer_read
),
1536 if (tu
->queue
== NULL
)
1541 snd_timer_close(tu
->timeri
);
1544 tu
->timeri
->flags
|= SNDRV_TIMER_IFLG_FAST
;
1545 tu
->timeri
->callback
= tu
->tread
1546 ? snd_timer_user_tinterrupt
: snd_timer_user_interrupt
;
1547 tu
->timeri
->ccallback
= snd_timer_user_ccallback
;
1548 tu
->timeri
->callback_data
= (void *)tu
;
1552 mutex_unlock(&tu
->tread_sem
);
1556 static int snd_timer_user_info(struct file
*file
,
1557 struct snd_timer_info __user
*_info
)
1559 struct snd_timer_user
*tu
;
1560 struct snd_timer_info
*info
;
1561 struct snd_timer
*t
;
1564 tu
= file
->private_data
;
1567 t
= tu
->timeri
->timer
;
1571 info
= kzalloc(sizeof(*info
), GFP_KERNEL
);
1574 info
->card
= t
->card
? t
->card
->number
: -1;
1575 if (t
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)
1576 info
->flags
|= SNDRV_TIMER_FLG_SLAVE
;
1577 strlcpy(info
->id
, t
->id
, sizeof(info
->id
));
1578 strlcpy(info
->name
, t
->name
, sizeof(info
->name
));
1579 info
->resolution
= t
->hw
.resolution
;
1580 if (copy_to_user(_info
, info
, sizeof(*_info
)))
1586 static int snd_timer_user_params(struct file
*file
,
1587 struct snd_timer_params __user
*_params
)
1589 struct snd_timer_user
*tu
;
1590 struct snd_timer_params params
;
1591 struct snd_timer
*t
;
1592 struct snd_timer_read
*tr
;
1593 struct snd_timer_tread
*ttr
;
1596 tu
= file
->private_data
;
1599 t
= tu
->timeri
->timer
;
1602 if (copy_from_user(¶ms
, _params
, sizeof(params
)))
1604 if (!(t
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
) && params
.ticks
< 1) {
1608 if (params
.queue_size
> 0 &&
1609 (params
.queue_size
< 32 || params
.queue_size
> 1024)) {
1613 if (params
.filter
& ~((1<<SNDRV_TIMER_EVENT_RESOLUTION
)|
1614 (1<<SNDRV_TIMER_EVENT_TICK
)|
1615 (1<<SNDRV_TIMER_EVENT_START
)|
1616 (1<<SNDRV_TIMER_EVENT_STOP
)|
1617 (1<<SNDRV_TIMER_EVENT_CONTINUE
)|
1618 (1<<SNDRV_TIMER_EVENT_PAUSE
)|
1619 (1<<SNDRV_TIMER_EVENT_SUSPEND
)|
1620 (1<<SNDRV_TIMER_EVENT_RESUME
)|
1621 (1<<SNDRV_TIMER_EVENT_MSTART
)|
1622 (1<<SNDRV_TIMER_EVENT_MSTOP
)|
1623 (1<<SNDRV_TIMER_EVENT_MCONTINUE
)|
1624 (1<<SNDRV_TIMER_EVENT_MPAUSE
)|
1625 (1<<SNDRV_TIMER_EVENT_MSUSPEND
)|
1626 (1<<SNDRV_TIMER_EVENT_MRESUME
))) {
1630 snd_timer_stop(tu
->timeri
);
1631 spin_lock_irq(&t
->lock
);
1632 tu
->timeri
->flags
&= ~(SNDRV_TIMER_IFLG_AUTO
|
1633 SNDRV_TIMER_IFLG_EXCLUSIVE
|
1634 SNDRV_TIMER_IFLG_EARLY_EVENT
);
1635 if (params
.flags
& SNDRV_TIMER_PSFLG_AUTO
)
1636 tu
->timeri
->flags
|= SNDRV_TIMER_IFLG_AUTO
;
1637 if (params
.flags
& SNDRV_TIMER_PSFLG_EXCLUSIVE
)
1638 tu
->timeri
->flags
|= SNDRV_TIMER_IFLG_EXCLUSIVE
;
1639 if (params
.flags
& SNDRV_TIMER_PSFLG_EARLY_EVENT
)
1640 tu
->timeri
->flags
|= SNDRV_TIMER_IFLG_EARLY_EVENT
;
1641 spin_unlock_irq(&t
->lock
);
1642 if (params
.queue_size
> 0 &&
1643 (unsigned int)tu
->queue_size
!= params
.queue_size
) {
1645 ttr
= kmalloc(params
.queue_size
* sizeof(*ttr
),
1649 tu
->queue_size
= params
.queue_size
;
1653 tr
= kmalloc(params
.queue_size
* sizeof(*tr
),
1657 tu
->queue_size
= params
.queue_size
;
1662 tu
->qhead
= tu
->qtail
= tu
->qused
= 0;
1663 if (tu
->timeri
->flags
& SNDRV_TIMER_IFLG_EARLY_EVENT
) {
1665 struct snd_timer_tread tread
;
1666 tread
.event
= SNDRV_TIMER_EVENT_EARLY
;
1667 tread
.tstamp
.tv_sec
= 0;
1668 tread
.tstamp
.tv_nsec
= 0;
1670 snd_timer_user_append_to_tqueue(tu
, &tread
);
1672 struct snd_timer_read
*r
= &tu
->queue
[0];
1679 tu
->filter
= params
.filter
;
1680 tu
->ticks
= params
.ticks
;
1683 if (copy_to_user(_params
, ¶ms
, sizeof(params
)))
1688 static int snd_timer_user_status(struct file
*file
,
1689 struct snd_timer_status __user
*_status
)
1691 struct snd_timer_user
*tu
;
1692 struct snd_timer_status status
;
1694 tu
= file
->private_data
;
1697 memset(&status
, 0, sizeof(status
));
1698 status
.tstamp
= tu
->tstamp
;
1699 status
.resolution
= snd_timer_resolution(tu
->timeri
);
1700 status
.lost
= tu
->timeri
->lost
;
1701 status
.overrun
= tu
->overrun
;
1702 spin_lock_irq(&tu
->qlock
);
1703 status
.queue
= tu
->qused
;
1704 spin_unlock_irq(&tu
->qlock
);
1705 if (copy_to_user(_status
, &status
, sizeof(status
)))
1710 static int snd_timer_user_start(struct file
*file
)
1713 struct snd_timer_user
*tu
;
1715 tu
= file
->private_data
;
1718 snd_timer_stop(tu
->timeri
);
1719 tu
->timeri
->lost
= 0;
1720 tu
->last_resolution
= 0;
1721 return (err
= snd_timer_start(tu
->timeri
, tu
->ticks
)) < 0 ? err
: 0;
1724 static int snd_timer_user_stop(struct file
*file
)
1727 struct snd_timer_user
*tu
;
1729 tu
= file
->private_data
;
1732 return (err
= snd_timer_stop(tu
->timeri
)) < 0 ? err
: 0;
1735 static int snd_timer_user_continue(struct file
*file
)
1738 struct snd_timer_user
*tu
;
1740 tu
= file
->private_data
;
1743 tu
->timeri
->lost
= 0;
1744 return (err
= snd_timer_continue(tu
->timeri
)) < 0 ? err
: 0;
1747 static int snd_timer_user_pause(struct file
*file
)
1750 struct snd_timer_user
*tu
;
1752 tu
= file
->private_data
;
1755 return (err
= snd_timer_pause(tu
->timeri
)) < 0 ? err
: 0;
1759 SNDRV_TIMER_IOCTL_START_OLD
= _IO('T', 0x20),
1760 SNDRV_TIMER_IOCTL_STOP_OLD
= _IO('T', 0x21),
1761 SNDRV_TIMER_IOCTL_CONTINUE_OLD
= _IO('T', 0x22),
1762 SNDRV_TIMER_IOCTL_PAUSE_OLD
= _IO('T', 0x23),
1765 static long snd_timer_user_ioctl(struct file
*file
, unsigned int cmd
,
1768 struct snd_timer_user
*tu
;
1769 void __user
*argp
= (void __user
*)arg
;
1770 int __user
*p
= argp
;
1772 tu
= file
->private_data
;
1774 case SNDRV_TIMER_IOCTL_PVERSION
:
1775 return put_user(SNDRV_TIMER_VERSION
, p
) ? -EFAULT
: 0;
1776 case SNDRV_TIMER_IOCTL_NEXT_DEVICE
:
1777 return snd_timer_user_next_device(argp
);
1778 case SNDRV_TIMER_IOCTL_TREAD
:
1782 mutex_lock(&tu
->tread_sem
);
1783 if (tu
->timeri
) { /* too late */
1784 mutex_unlock(&tu
->tread_sem
);
1787 if (get_user(xarg
, p
)) {
1788 mutex_unlock(&tu
->tread_sem
);
1791 tu
->tread
= xarg
? 1 : 0;
1792 mutex_unlock(&tu
->tread_sem
);
1795 case SNDRV_TIMER_IOCTL_GINFO
:
1796 return snd_timer_user_ginfo(file
, argp
);
1797 case SNDRV_TIMER_IOCTL_GPARAMS
:
1798 return snd_timer_user_gparams(file
, argp
);
1799 case SNDRV_TIMER_IOCTL_GSTATUS
:
1800 return snd_timer_user_gstatus(file
, argp
);
1801 case SNDRV_TIMER_IOCTL_SELECT
:
1802 return snd_timer_user_tselect(file
, argp
);
1803 case SNDRV_TIMER_IOCTL_INFO
:
1804 return snd_timer_user_info(file
, argp
);
1805 case SNDRV_TIMER_IOCTL_PARAMS
:
1806 return snd_timer_user_params(file
, argp
);
1807 case SNDRV_TIMER_IOCTL_STATUS
:
1808 return snd_timer_user_status(file
, argp
);
1809 case SNDRV_TIMER_IOCTL_START
:
1810 case SNDRV_TIMER_IOCTL_START_OLD
:
1811 return snd_timer_user_start(file
);
1812 case SNDRV_TIMER_IOCTL_STOP
:
1813 case SNDRV_TIMER_IOCTL_STOP_OLD
:
1814 return snd_timer_user_stop(file
);
1815 case SNDRV_TIMER_IOCTL_CONTINUE
:
1816 case SNDRV_TIMER_IOCTL_CONTINUE_OLD
:
1817 return snd_timer_user_continue(file
);
1818 case SNDRV_TIMER_IOCTL_PAUSE
:
1819 case SNDRV_TIMER_IOCTL_PAUSE_OLD
:
1820 return snd_timer_user_pause(file
);
1825 static int snd_timer_user_fasync(int fd
, struct file
* file
, int on
)
1827 struct snd_timer_user
*tu
;
1830 tu
= file
->private_data
;
1831 err
= fasync_helper(fd
, file
, on
, &tu
->fasync
);
1837 static ssize_t
snd_timer_user_read(struct file
*file
, char __user
*buffer
,
1838 size_t count
, loff_t
*offset
)
1840 struct snd_timer_user
*tu
;
1841 long result
= 0, unit
;
1844 tu
= file
->private_data
;
1845 unit
= tu
->tread
? sizeof(struct snd_timer_tread
) : sizeof(struct snd_timer_read
);
1846 spin_lock_irq(&tu
->qlock
);
1847 while ((long)count
- result
>= unit
) {
1848 while (!tu
->qused
) {
1851 if ((file
->f_flags
& O_NONBLOCK
) != 0 || result
> 0) {
1856 set_current_state(TASK_INTERRUPTIBLE
);
1857 init_waitqueue_entry(&wait
, current
);
1858 add_wait_queue(&tu
->qchange_sleep
, &wait
);
1860 spin_unlock_irq(&tu
->qlock
);
1862 spin_lock_irq(&tu
->qlock
);
1864 remove_wait_queue(&tu
->qchange_sleep
, &wait
);
1866 if (signal_pending(current
)) {
1872 spin_unlock_irq(&tu
->qlock
);
1877 if (copy_to_user(buffer
, &tu
->tqueue
[tu
->qhead
++],
1878 sizeof(struct snd_timer_tread
))) {
1883 if (copy_to_user(buffer
, &tu
->queue
[tu
->qhead
++],
1884 sizeof(struct snd_timer_read
))) {
1890 tu
->qhead
%= tu
->queue_size
;
1895 spin_lock_irq(&tu
->qlock
);
1898 spin_unlock_irq(&tu
->qlock
);
1900 return result
> 0 ? result
: err
;
1903 static unsigned int snd_timer_user_poll(struct file
*file
, poll_table
* wait
)
1906 struct snd_timer_user
*tu
;
1908 tu
= file
->private_data
;
1910 poll_wait(file
, &tu
->qchange_sleep
, wait
);
1914 mask
|= POLLIN
| POLLRDNORM
;
1919 #ifdef CONFIG_COMPAT
1920 #include "timer_compat.c"
1922 #define snd_timer_user_ioctl_compat NULL
1925 static const struct file_operations snd_timer_f_ops
=
1927 .owner
= THIS_MODULE
,
1928 .read
= snd_timer_user_read
,
1929 .open
= snd_timer_user_open
,
1930 .release
= snd_timer_user_release
,
1931 .poll
= snd_timer_user_poll
,
1932 .unlocked_ioctl
= snd_timer_user_ioctl
,
1933 .compat_ioctl
= snd_timer_user_ioctl_compat
,
1934 .fasync
= snd_timer_user_fasync
,
1941 static int __init
alsa_timer_init(void)
1945 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1946 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS
, SNDRV_CARDS
- 1,
1950 if ((err
= snd_timer_register_system()) < 0)
1951 snd_printk(KERN_ERR
"unable to register system timer (%i)\n",
1953 if ((err
= snd_register_device(SNDRV_DEVICE_TYPE_TIMER
, NULL
, 0,
1954 &snd_timer_f_ops
, NULL
, "timer")) < 0)
1955 snd_printk(KERN_ERR
"unable to register timer device (%i)\n",
1957 snd_timer_proc_init();
1961 static void __exit
alsa_timer_exit(void)
1963 struct list_head
*p
, *n
;
1965 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER
, NULL
, 0);
1966 /* unregister the system timer */
1967 list_for_each_safe(p
, n
, &snd_timer_list
) {
1968 struct snd_timer
*timer
= list_entry(p
, struct snd_timer
, device_list
);
1969 snd_timer_free(timer
);
1971 snd_timer_proc_done();
1972 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1973 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS
, SNDRV_CARDS
- 1);
1977 module_init(alsa_timer_init
)
1978 module_exit(alsa_timer_exit
)
1980 EXPORT_SYMBOL(snd_timer_open
);
1981 EXPORT_SYMBOL(snd_timer_close
);
1982 EXPORT_SYMBOL(snd_timer_resolution
);
1983 EXPORT_SYMBOL(snd_timer_start
);
1984 EXPORT_SYMBOL(snd_timer_stop
);
1985 EXPORT_SYMBOL(snd_timer_continue
);
1986 EXPORT_SYMBOL(snd_timer_pause
);
1987 EXPORT_SYMBOL(snd_timer_new
);
1988 EXPORT_SYMBOL(snd_timer_notify
);
1989 EXPORT_SYMBOL(snd_timer_global_new
);
1990 EXPORT_SYMBOL(snd_timer_global_free
);
1991 EXPORT_SYMBOL(snd_timer_global_register
);
1992 EXPORT_SYMBOL(snd_timer_interrupt
);