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/device.h>
28 #include <linux/module.h>
29 #include <linux/string.h>
30 #include <sound/core.h>
31 #include <sound/timer.h>
32 #include <sound/control.h>
33 #include <sound/info.h>
34 #include <sound/minors.h>
35 #include <sound/initval.h>
36 #include <linux/kmod.h>
38 #if IS_ENABLED(CONFIG_SND_HRTIMER)
39 #define DEFAULT_TIMER_LIMIT 4
40 #elif IS_ENABLED(CONFIG_SND_RTCTIMER)
41 #define DEFAULT_TIMER_LIMIT 2
43 #define DEFAULT_TIMER_LIMIT 1
46 static int timer_limit
= DEFAULT_TIMER_LIMIT
;
47 static int timer_tstamp_monotonic
= 1;
48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
49 MODULE_DESCRIPTION("ALSA timer interface");
50 MODULE_LICENSE("GPL");
51 module_param(timer_limit
, int, 0444);
52 MODULE_PARM_DESC(timer_limit
, "Maximum global timers in system.");
53 module_param(timer_tstamp_monotonic
, int, 0444);
54 MODULE_PARM_DESC(timer_tstamp_monotonic
, "Use posix monotonic clock source for timestamps (default).");
56 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR
, SNDRV_MINOR_TIMER
);
57 MODULE_ALIAS("devname:snd/timer");
59 struct snd_timer_user
{
60 struct snd_timer_instance
*timeri
;
61 int tread
; /* enhanced read with timestamps and events */
63 unsigned long overrun
;
69 struct snd_timer_read
*queue
;
70 struct snd_timer_tread
*tqueue
;
72 unsigned long last_resolution
;
74 struct timespec tstamp
; /* trigger tstamp */
75 wait_queue_head_t qchange_sleep
;
76 struct fasync_struct
*fasync
;
77 struct mutex ioctl_lock
;
81 static LIST_HEAD(snd_timer_list
);
83 /* list of slave instances */
84 static LIST_HEAD(snd_timer_slave_list
);
86 /* lock for slave active lists */
87 static DEFINE_SPINLOCK(slave_active_lock
);
89 static DEFINE_MUTEX(register_mutex
);
91 static int snd_timer_free(struct snd_timer
*timer
);
92 static int snd_timer_dev_free(struct snd_device
*device
);
93 static int snd_timer_dev_register(struct snd_device
*device
);
94 static int snd_timer_dev_disconnect(struct snd_device
*device
);
96 static void snd_timer_reschedule(struct snd_timer
* timer
, unsigned long ticks_left
);
99 * create a timer instance with the given owner string.
100 * when timer is not NULL, increments the module counter
102 static struct snd_timer_instance
*snd_timer_instance_new(char *owner
,
103 struct snd_timer
*timer
)
105 struct snd_timer_instance
*timeri
;
106 timeri
= kzalloc(sizeof(*timeri
), GFP_KERNEL
);
109 timeri
->owner
= kstrdup(owner
, GFP_KERNEL
);
110 if (! timeri
->owner
) {
114 INIT_LIST_HEAD(&timeri
->open_list
);
115 INIT_LIST_HEAD(&timeri
->active_list
);
116 INIT_LIST_HEAD(&timeri
->ack_list
);
117 INIT_LIST_HEAD(&timeri
->slave_list_head
);
118 INIT_LIST_HEAD(&timeri
->slave_active_head
);
120 timeri
->timer
= timer
;
121 if (timer
&& !try_module_get(timer
->module
)) {
122 kfree(timeri
->owner
);
131 * find a timer instance from the given timer id
133 static struct snd_timer
*snd_timer_find(struct snd_timer_id
*tid
)
135 struct snd_timer
*timer
= NULL
;
137 list_for_each_entry(timer
, &snd_timer_list
, device_list
) {
138 if (timer
->tmr_class
!= tid
->dev_class
)
140 if ((timer
->tmr_class
== SNDRV_TIMER_CLASS_CARD
||
141 timer
->tmr_class
== SNDRV_TIMER_CLASS_PCM
) &&
142 (timer
->card
== NULL
||
143 timer
->card
->number
!= tid
->card
))
145 if (timer
->tmr_device
!= tid
->device
)
147 if (timer
->tmr_subdevice
!= tid
->subdevice
)
154 #ifdef CONFIG_MODULES
156 static void snd_timer_request(struct snd_timer_id
*tid
)
158 switch (tid
->dev_class
) {
159 case SNDRV_TIMER_CLASS_GLOBAL
:
160 if (tid
->device
< timer_limit
)
161 request_module("snd-timer-%i", tid
->device
);
163 case SNDRV_TIMER_CLASS_CARD
:
164 case SNDRV_TIMER_CLASS_PCM
:
165 if (tid
->card
< snd_ecards_limit
)
166 request_module("snd-card-%i", tid
->card
);
176 * look for a master instance matching with the slave id of the given slave.
177 * when found, relink the open_link of the slave.
179 * call this with register_mutex down.
181 static void snd_timer_check_slave(struct snd_timer_instance
*slave
)
183 struct snd_timer
*timer
;
184 struct snd_timer_instance
*master
;
186 /* FIXME: it's really dumb to look up all entries.. */
187 list_for_each_entry(timer
, &snd_timer_list
, device_list
) {
188 list_for_each_entry(master
, &timer
->open_list_head
, open_list
) {
189 if (slave
->slave_class
== master
->slave_class
&&
190 slave
->slave_id
== master
->slave_id
) {
191 list_move_tail(&slave
->open_list
,
192 &master
->slave_list_head
);
193 spin_lock_irq(&slave_active_lock
);
194 slave
->master
= master
;
195 slave
->timer
= master
->timer
;
196 spin_unlock_irq(&slave_active_lock
);
204 * look for slave instances matching with the slave id of the given master.
205 * when found, relink the open_link of slaves.
207 * call this with register_mutex down.
209 static void snd_timer_check_master(struct snd_timer_instance
*master
)
211 struct snd_timer_instance
*slave
, *tmp
;
213 /* check all pending slaves */
214 list_for_each_entry_safe(slave
, tmp
, &snd_timer_slave_list
, open_list
) {
215 if (slave
->slave_class
== master
->slave_class
&&
216 slave
->slave_id
== master
->slave_id
) {
217 list_move_tail(&slave
->open_list
, &master
->slave_list_head
);
218 spin_lock_irq(&slave_active_lock
);
219 spin_lock(&master
->timer
->lock
);
220 slave
->master
= master
;
221 slave
->timer
= master
->timer
;
222 if (slave
->flags
& SNDRV_TIMER_IFLG_RUNNING
)
223 list_add_tail(&slave
->active_list
,
224 &master
->slave_active_head
);
225 spin_unlock(&master
->timer
->lock
);
226 spin_unlock_irq(&slave_active_lock
);
232 * open a timer instance
233 * when opening a master, the slave id must be here given.
235 int snd_timer_open(struct snd_timer_instance
**ti
,
236 char *owner
, struct snd_timer_id
*tid
,
237 unsigned int slave_id
)
239 struct snd_timer
*timer
;
240 struct snd_timer_instance
*timeri
= NULL
;
242 if (tid
->dev_class
== SNDRV_TIMER_CLASS_SLAVE
) {
243 /* open a slave instance */
244 if (tid
->dev_sclass
<= SNDRV_TIMER_SCLASS_NONE
||
245 tid
->dev_sclass
> SNDRV_TIMER_SCLASS_OSS_SEQUENCER
) {
246 pr_debug("ALSA: timer: invalid slave class %i\n",
250 mutex_lock(®ister_mutex
);
251 timeri
= snd_timer_instance_new(owner
, NULL
);
253 mutex_unlock(®ister_mutex
);
256 timeri
->slave_class
= tid
->dev_sclass
;
257 timeri
->slave_id
= tid
->device
;
258 timeri
->flags
|= SNDRV_TIMER_IFLG_SLAVE
;
259 list_add_tail(&timeri
->open_list
, &snd_timer_slave_list
);
260 snd_timer_check_slave(timeri
);
261 mutex_unlock(®ister_mutex
);
266 /* open a master instance */
267 mutex_lock(®ister_mutex
);
268 timer
= snd_timer_find(tid
);
269 #ifdef CONFIG_MODULES
271 mutex_unlock(®ister_mutex
);
272 snd_timer_request(tid
);
273 mutex_lock(®ister_mutex
);
274 timer
= snd_timer_find(tid
);
278 mutex_unlock(®ister_mutex
);
281 if (!list_empty(&timer
->open_list_head
)) {
282 timeri
= list_entry(timer
->open_list_head
.next
,
283 struct snd_timer_instance
, open_list
);
284 if (timeri
->flags
& SNDRV_TIMER_IFLG_EXCLUSIVE
) {
285 mutex_unlock(®ister_mutex
);
289 timeri
= snd_timer_instance_new(owner
, timer
);
291 mutex_unlock(®ister_mutex
);
294 /* take a card refcount for safe disconnection */
296 get_device(&timer
->card
->card_dev
);
297 timeri
->slave_class
= tid
->dev_sclass
;
298 timeri
->slave_id
= slave_id
;
299 if (list_empty(&timer
->open_list_head
) && timer
->hw
.open
)
300 timer
->hw
.open(timer
);
301 list_add_tail(&timeri
->open_list
, &timer
->open_list_head
);
302 snd_timer_check_master(timeri
);
303 mutex_unlock(®ister_mutex
);
308 static int _snd_timer_stop(struct snd_timer_instance
*timeri
, int event
);
311 * close a timer instance
313 int snd_timer_close(struct snd_timer_instance
*timeri
)
315 struct snd_timer
*timer
= NULL
;
316 struct snd_timer_instance
*slave
, *tmp
;
318 if (snd_BUG_ON(!timeri
))
321 /* force to stop the timer */
322 snd_timer_stop(timeri
);
324 if (timeri
->flags
& SNDRV_TIMER_IFLG_SLAVE
) {
325 /* wait, until the active callback is finished */
326 spin_lock_irq(&slave_active_lock
);
327 while (timeri
->flags
& SNDRV_TIMER_IFLG_CALLBACK
) {
328 spin_unlock_irq(&slave_active_lock
);
330 spin_lock_irq(&slave_active_lock
);
332 spin_unlock_irq(&slave_active_lock
);
333 mutex_lock(®ister_mutex
);
334 list_del(&timeri
->open_list
);
335 mutex_unlock(®ister_mutex
);
337 timer
= timeri
->timer
;
338 if (snd_BUG_ON(!timer
))
340 /* wait, until the active callback is finished */
341 spin_lock_irq(&timer
->lock
);
342 while (timeri
->flags
& SNDRV_TIMER_IFLG_CALLBACK
) {
343 spin_unlock_irq(&timer
->lock
);
345 spin_lock_irq(&timer
->lock
);
347 spin_unlock_irq(&timer
->lock
);
348 mutex_lock(®ister_mutex
);
349 list_del(&timeri
->open_list
);
350 if (list_empty(&timer
->open_list_head
) &&
352 timer
->hw
.close(timer
);
353 /* remove slave links */
354 spin_lock_irq(&slave_active_lock
);
355 spin_lock(&timer
->lock
);
356 list_for_each_entry_safe(slave
, tmp
, &timeri
->slave_list_head
,
358 list_move_tail(&slave
->open_list
, &snd_timer_slave_list
);
359 slave
->master
= NULL
;
361 list_del_init(&slave
->ack_list
);
362 list_del_init(&slave
->active_list
);
364 spin_unlock(&timer
->lock
);
365 spin_unlock_irq(&slave_active_lock
);
366 /* release a card refcount for safe disconnection */
368 put_device(&timer
->card
->card_dev
);
369 mutex_unlock(®ister_mutex
);
372 if (timeri
->private_free
)
373 timeri
->private_free(timeri
);
374 kfree(timeri
->owner
);
377 module_put(timer
->module
);
381 unsigned long snd_timer_resolution(struct snd_timer_instance
*timeri
)
383 struct snd_timer
* timer
;
387 if ((timer
= timeri
->timer
) != NULL
) {
388 if (timer
->hw
.c_resolution
)
389 return timer
->hw
.c_resolution(timer
);
390 return timer
->hw
.resolution
;
395 static void snd_timer_notify1(struct snd_timer_instance
*ti
, int event
)
397 struct snd_timer
*timer
;
399 unsigned long resolution
= 0;
400 struct snd_timer_instance
*ts
;
401 struct timespec tstamp
;
403 if (timer_tstamp_monotonic
)
404 ktime_get_ts(&tstamp
);
406 getnstimeofday(&tstamp
);
407 if (snd_BUG_ON(event
< SNDRV_TIMER_EVENT_START
||
408 event
> SNDRV_TIMER_EVENT_PAUSE
))
410 if (event
== SNDRV_TIMER_EVENT_START
||
411 event
== SNDRV_TIMER_EVENT_CONTINUE
)
412 resolution
= snd_timer_resolution(ti
);
414 ti
->ccallback(ti
, event
, &tstamp
, resolution
);
415 if (ti
->flags
& SNDRV_TIMER_IFLG_SLAVE
)
420 if (timer
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)
422 spin_lock_irqsave(&timer
->lock
, flags
);
423 list_for_each_entry(ts
, &ti
->slave_active_head
, active_list
)
425 ts
->ccallback(ts
, event
+ 100, &tstamp
, resolution
);
426 spin_unlock_irqrestore(&timer
->lock
, flags
);
429 static int snd_timer_start1(struct snd_timer
*timer
, struct snd_timer_instance
*timeri
,
430 unsigned long sticks
)
432 list_move_tail(&timeri
->active_list
, &timer
->active_list_head
);
433 if (timer
->running
) {
434 if (timer
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)
436 timer
->flags
|= SNDRV_TIMER_FLG_RESCHED
;
437 timeri
->flags
|= SNDRV_TIMER_IFLG_START
;
438 return 1; /* delayed start */
440 timer
->sticks
= sticks
;
441 timer
->hw
.start(timer
);
444 timeri
->flags
|= SNDRV_TIMER_IFLG_RUNNING
;
449 static int snd_timer_start_slave(struct snd_timer_instance
*timeri
)
453 spin_lock_irqsave(&slave_active_lock
, flags
);
454 if (timeri
->flags
& SNDRV_TIMER_IFLG_RUNNING
) {
455 spin_unlock_irqrestore(&slave_active_lock
, flags
);
458 timeri
->flags
|= SNDRV_TIMER_IFLG_RUNNING
;
459 if (timeri
->master
&& timeri
->timer
) {
460 spin_lock(&timeri
->timer
->lock
);
461 list_add_tail(&timeri
->active_list
,
462 &timeri
->master
->slave_active_head
);
463 spin_unlock(&timeri
->timer
->lock
);
465 spin_unlock_irqrestore(&slave_active_lock
, flags
);
466 return 1; /* delayed start */
470 * start the timer instance
472 int snd_timer_start(struct snd_timer_instance
*timeri
, unsigned int ticks
)
474 struct snd_timer
*timer
;
475 int result
= -EINVAL
;
478 if (timeri
== NULL
|| ticks
< 1)
480 if (timeri
->flags
& SNDRV_TIMER_IFLG_SLAVE
) {
481 result
= snd_timer_start_slave(timeri
);
483 snd_timer_notify1(timeri
, SNDRV_TIMER_EVENT_START
);
486 timer
= timeri
->timer
;
489 if (timer
->card
&& timer
->card
->shutdown
)
491 spin_lock_irqsave(&timer
->lock
, flags
);
492 if (timeri
->flags
& (SNDRV_TIMER_IFLG_RUNNING
|
493 SNDRV_TIMER_IFLG_START
)) {
497 timeri
->ticks
= timeri
->cticks
= ticks
;
499 result
= snd_timer_start1(timer
, timeri
, ticks
);
501 spin_unlock_irqrestore(&timer
->lock
, flags
);
503 snd_timer_notify1(timeri
, SNDRV_TIMER_EVENT_START
);
507 static int _snd_timer_stop(struct snd_timer_instance
*timeri
, int event
)
509 struct snd_timer
*timer
;
512 if (snd_BUG_ON(!timeri
))
515 if (timeri
->flags
& SNDRV_TIMER_IFLG_SLAVE
) {
516 spin_lock_irqsave(&slave_active_lock
, flags
);
517 if (!(timeri
->flags
& SNDRV_TIMER_IFLG_RUNNING
)) {
518 spin_unlock_irqrestore(&slave_active_lock
, flags
);
522 spin_lock(&timeri
->timer
->lock
);
523 timeri
->flags
&= ~SNDRV_TIMER_IFLG_RUNNING
;
524 list_del_init(&timeri
->ack_list
);
525 list_del_init(&timeri
->active_list
);
527 spin_unlock(&timeri
->timer
->lock
);
528 spin_unlock_irqrestore(&slave_active_lock
, flags
);
531 timer
= timeri
->timer
;
534 spin_lock_irqsave(&timer
->lock
, flags
);
535 if (!(timeri
->flags
& (SNDRV_TIMER_IFLG_RUNNING
|
536 SNDRV_TIMER_IFLG_START
))) {
537 spin_unlock_irqrestore(&timer
->lock
, flags
);
540 list_del_init(&timeri
->ack_list
);
541 list_del_init(&timeri
->active_list
);
542 if (timer
->card
&& timer
->card
->shutdown
) {
543 spin_unlock_irqrestore(&timer
->lock
, flags
);
546 if ((timeri
->flags
& SNDRV_TIMER_IFLG_RUNNING
) &&
547 !(--timer
->running
)) {
548 timer
->hw
.stop(timer
);
549 if (timer
->flags
& SNDRV_TIMER_FLG_RESCHED
) {
550 timer
->flags
&= ~SNDRV_TIMER_FLG_RESCHED
;
551 snd_timer_reschedule(timer
, 0);
552 if (timer
->flags
& SNDRV_TIMER_FLG_CHANGE
) {
553 timer
->flags
&= ~SNDRV_TIMER_FLG_CHANGE
;
554 timer
->hw
.start(timer
);
558 timeri
->flags
&= ~(SNDRV_TIMER_IFLG_RUNNING
| SNDRV_TIMER_IFLG_START
);
559 spin_unlock_irqrestore(&timer
->lock
, flags
);
561 if (event
!= SNDRV_TIMER_EVENT_RESOLUTION
)
562 snd_timer_notify1(timeri
, event
);
567 * stop the timer instance.
569 * do not call this from the timer callback!
571 int snd_timer_stop(struct snd_timer_instance
*timeri
)
573 struct snd_timer
*timer
;
577 err
= _snd_timer_stop(timeri
, SNDRV_TIMER_EVENT_STOP
);
580 timer
= timeri
->timer
;
583 spin_lock_irqsave(&timer
->lock
, flags
);
584 timeri
->cticks
= timeri
->ticks
;
586 spin_unlock_irqrestore(&timer
->lock
, flags
);
591 * start again.. the tick is kept.
593 int snd_timer_continue(struct snd_timer_instance
*timeri
)
595 struct snd_timer
*timer
;
596 int result
= -EINVAL
;
601 if (timeri
->flags
& SNDRV_TIMER_IFLG_SLAVE
)
602 return snd_timer_start_slave(timeri
);
603 timer
= timeri
->timer
;
606 if (timer
->card
&& timer
->card
->shutdown
)
608 spin_lock_irqsave(&timer
->lock
, flags
);
609 if (timeri
->flags
& SNDRV_TIMER_IFLG_RUNNING
) {
616 result
= snd_timer_start1(timer
, timeri
, timer
->sticks
);
618 spin_unlock_irqrestore(&timer
->lock
, flags
);
619 snd_timer_notify1(timeri
, SNDRV_TIMER_EVENT_CONTINUE
);
624 * pause.. remember the ticks left
626 int snd_timer_pause(struct snd_timer_instance
* timeri
)
628 return _snd_timer_stop(timeri
, SNDRV_TIMER_EVENT_PAUSE
);
632 * reschedule the timer
634 * start pending instances and check the scheduling ticks.
635 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
637 static void snd_timer_reschedule(struct snd_timer
* timer
, unsigned long ticks_left
)
639 struct snd_timer_instance
*ti
;
640 unsigned long ticks
= ~0UL;
642 list_for_each_entry(ti
, &timer
->active_list_head
, active_list
) {
643 if (ti
->flags
& SNDRV_TIMER_IFLG_START
) {
644 ti
->flags
&= ~SNDRV_TIMER_IFLG_START
;
645 ti
->flags
|= SNDRV_TIMER_IFLG_RUNNING
;
648 if (ti
->flags
& SNDRV_TIMER_IFLG_RUNNING
) {
649 if (ticks
> ti
->cticks
)
654 timer
->flags
&= ~SNDRV_TIMER_FLG_RESCHED
;
657 if (ticks
> timer
->hw
.ticks
)
658 ticks
= timer
->hw
.ticks
;
659 if (ticks_left
!= ticks
)
660 timer
->flags
|= SNDRV_TIMER_FLG_CHANGE
;
661 timer
->sticks
= ticks
;
668 static void snd_timer_tasklet(unsigned long arg
)
670 struct snd_timer
*timer
= (struct snd_timer
*) arg
;
671 struct snd_timer_instance
*ti
;
673 unsigned long resolution
, ticks
;
676 if (timer
->card
&& timer
->card
->shutdown
)
679 spin_lock_irqsave(&timer
->lock
, flags
);
680 /* now process all callbacks */
681 while (!list_empty(&timer
->sack_list_head
)) {
682 p
= timer
->sack_list_head
.next
; /* get first item */
683 ti
= list_entry(p
, struct snd_timer_instance
, ack_list
);
685 /* remove from ack_list and make empty */
690 resolution
= ti
->resolution
;
692 ti
->flags
|= SNDRV_TIMER_IFLG_CALLBACK
;
693 spin_unlock(&timer
->lock
);
695 ti
->callback(ti
, resolution
, ticks
);
696 spin_lock(&timer
->lock
);
697 ti
->flags
&= ~SNDRV_TIMER_IFLG_CALLBACK
;
699 spin_unlock_irqrestore(&timer
->lock
, flags
);
705 * ticks_left is usually equal to timer->sticks.
708 void snd_timer_interrupt(struct snd_timer
* timer
, unsigned long ticks_left
)
710 struct snd_timer_instance
*ti
, *ts
, *tmp
;
711 unsigned long resolution
, ticks
;
712 struct list_head
*p
, *ack_list_head
;
719 if (timer
->card
&& timer
->card
->shutdown
)
722 spin_lock_irqsave(&timer
->lock
, flags
);
724 /* remember the current resolution */
725 if (timer
->hw
.c_resolution
)
726 resolution
= timer
->hw
.c_resolution(timer
);
728 resolution
= timer
->hw
.resolution
;
730 /* loop for all active instances
731 * Here we cannot use list_for_each_entry because the active_list of a
732 * processed instance is relinked to done_list_head before the callback
735 list_for_each_entry_safe(ti
, tmp
, &timer
->active_list_head
,
737 if (!(ti
->flags
& SNDRV_TIMER_IFLG_RUNNING
))
739 ti
->pticks
+= ticks_left
;
740 ti
->resolution
= resolution
;
741 if (ti
->cticks
< ticks_left
)
744 ti
->cticks
-= ticks_left
;
745 if (ti
->cticks
) /* not expired */
747 if (ti
->flags
& SNDRV_TIMER_IFLG_AUTO
) {
748 ti
->cticks
= ti
->ticks
;
750 ti
->flags
&= ~SNDRV_TIMER_IFLG_RUNNING
;
752 list_del_init(&ti
->active_list
);
754 if ((timer
->hw
.flags
& SNDRV_TIMER_HW_TASKLET
) ||
755 (ti
->flags
& SNDRV_TIMER_IFLG_FAST
))
756 ack_list_head
= &timer
->ack_list_head
;
758 ack_list_head
= &timer
->sack_list_head
;
759 if (list_empty(&ti
->ack_list
))
760 list_add_tail(&ti
->ack_list
, ack_list_head
);
761 list_for_each_entry(ts
, &ti
->slave_active_head
, active_list
) {
762 ts
->pticks
= ti
->pticks
;
763 ts
->resolution
= resolution
;
764 if (list_empty(&ts
->ack_list
))
765 list_add_tail(&ts
->ack_list
, ack_list_head
);
768 if (timer
->flags
& SNDRV_TIMER_FLG_RESCHED
)
769 snd_timer_reschedule(timer
, timer
->sticks
);
770 if (timer
->running
) {
771 if (timer
->hw
.flags
& SNDRV_TIMER_HW_STOP
) {
772 timer
->hw
.stop(timer
);
773 timer
->flags
|= SNDRV_TIMER_FLG_CHANGE
;
775 if (!(timer
->hw
.flags
& SNDRV_TIMER_HW_AUTO
) ||
776 (timer
->flags
& SNDRV_TIMER_FLG_CHANGE
)) {
778 timer
->flags
&= ~SNDRV_TIMER_FLG_CHANGE
;
779 timer
->hw
.start(timer
);
782 timer
->hw
.stop(timer
);
785 /* now process all fast callbacks */
786 while (!list_empty(&timer
->ack_list_head
)) {
787 p
= timer
->ack_list_head
.next
; /* get first item */
788 ti
= list_entry(p
, struct snd_timer_instance
, ack_list
);
790 /* remove from ack_list and make empty */
796 ti
->flags
|= SNDRV_TIMER_IFLG_CALLBACK
;
797 spin_unlock(&timer
->lock
);
799 ti
->callback(ti
, resolution
, ticks
);
800 spin_lock(&timer
->lock
);
801 ti
->flags
&= ~SNDRV_TIMER_IFLG_CALLBACK
;
804 /* do we have any slow callbacks? */
805 use_tasklet
= !list_empty(&timer
->sack_list_head
);
806 spin_unlock_irqrestore(&timer
->lock
, flags
);
809 tasklet_schedule(&timer
->task_queue
);
816 int snd_timer_new(struct snd_card
*card
, char *id
, struct snd_timer_id
*tid
,
817 struct snd_timer
**rtimer
)
819 struct snd_timer
*timer
;
821 static struct snd_device_ops ops
= {
822 .dev_free
= snd_timer_dev_free
,
823 .dev_register
= snd_timer_dev_register
,
824 .dev_disconnect
= snd_timer_dev_disconnect
,
827 if (snd_BUG_ON(!tid
))
831 timer
= kzalloc(sizeof(*timer
), GFP_KERNEL
);
834 timer
->tmr_class
= tid
->dev_class
;
836 timer
->tmr_device
= tid
->device
;
837 timer
->tmr_subdevice
= tid
->subdevice
;
839 strlcpy(timer
->id
, id
, sizeof(timer
->id
));
840 INIT_LIST_HEAD(&timer
->device_list
);
841 INIT_LIST_HEAD(&timer
->open_list_head
);
842 INIT_LIST_HEAD(&timer
->active_list_head
);
843 INIT_LIST_HEAD(&timer
->ack_list_head
);
844 INIT_LIST_HEAD(&timer
->sack_list_head
);
845 spin_lock_init(&timer
->lock
);
846 tasklet_init(&timer
->task_queue
, snd_timer_tasklet
,
847 (unsigned long)timer
);
849 timer
->module
= card
->module
;
850 err
= snd_device_new(card
, SNDRV_DEV_TIMER
, timer
, &ops
);
852 snd_timer_free(timer
);
861 static int snd_timer_free(struct snd_timer
*timer
)
866 mutex_lock(®ister_mutex
);
867 if (! list_empty(&timer
->open_list_head
)) {
868 struct list_head
*p
, *n
;
869 struct snd_timer_instance
*ti
;
870 pr_warn("ALSA: timer %p is busy?\n", timer
);
871 list_for_each_safe(p
, n
, &timer
->open_list_head
) {
873 ti
= list_entry(p
, struct snd_timer_instance
, open_list
);
877 list_del(&timer
->device_list
);
878 mutex_unlock(®ister_mutex
);
880 if (timer
->private_free
)
881 timer
->private_free(timer
);
886 static int snd_timer_dev_free(struct snd_device
*device
)
888 struct snd_timer
*timer
= device
->device_data
;
889 return snd_timer_free(timer
);
892 static int snd_timer_dev_register(struct snd_device
*dev
)
894 struct snd_timer
*timer
= dev
->device_data
;
895 struct snd_timer
*timer1
;
897 if (snd_BUG_ON(!timer
|| !timer
->hw
.start
|| !timer
->hw
.stop
))
899 if (!(timer
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
) &&
900 !timer
->hw
.resolution
&& timer
->hw
.c_resolution
== NULL
)
903 mutex_lock(®ister_mutex
);
904 list_for_each_entry(timer1
, &snd_timer_list
, device_list
) {
905 if (timer1
->tmr_class
> timer
->tmr_class
)
907 if (timer1
->tmr_class
< timer
->tmr_class
)
909 if (timer1
->card
&& timer
->card
) {
910 if (timer1
->card
->number
> timer
->card
->number
)
912 if (timer1
->card
->number
< timer
->card
->number
)
915 if (timer1
->tmr_device
> timer
->tmr_device
)
917 if (timer1
->tmr_device
< timer
->tmr_device
)
919 if (timer1
->tmr_subdevice
> timer
->tmr_subdevice
)
921 if (timer1
->tmr_subdevice
< timer
->tmr_subdevice
)
924 mutex_unlock(®ister_mutex
);
927 list_add_tail(&timer
->device_list
, &timer1
->device_list
);
928 mutex_unlock(®ister_mutex
);
932 /* just for reference in snd_timer_dev_disconnect() below */
933 static void snd_timer_user_ccallback(struct snd_timer_instance
*timeri
,
934 int event
, struct timespec
*tstamp
,
935 unsigned long resolution
);
937 static int snd_timer_dev_disconnect(struct snd_device
*device
)
939 struct snd_timer
*timer
= device
->device_data
;
940 struct snd_timer_instance
*ti
;
942 mutex_lock(®ister_mutex
);
943 list_del_init(&timer
->device_list
);
944 /* wake up pending sleepers */
945 list_for_each_entry(ti
, &timer
->open_list_head
, open_list
) {
946 /* FIXME: better to have a ti.disconnect() op */
947 if (ti
->ccallback
== snd_timer_user_ccallback
) {
948 struct snd_timer_user
*tu
= ti
->callback_data
;
950 tu
->disconnected
= true;
951 wake_up(&tu
->qchange_sleep
);
954 mutex_unlock(®ister_mutex
);
958 void snd_timer_notify(struct snd_timer
*timer
, int event
, struct timespec
*tstamp
)
961 unsigned long resolution
= 0;
962 struct snd_timer_instance
*ti
, *ts
;
964 if (timer
->card
&& timer
->card
->shutdown
)
966 if (! (timer
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
))
968 if (snd_BUG_ON(event
< SNDRV_TIMER_EVENT_MSTART
||
969 event
> SNDRV_TIMER_EVENT_MRESUME
))
971 spin_lock_irqsave(&timer
->lock
, flags
);
972 if (event
== SNDRV_TIMER_EVENT_MSTART
||
973 event
== SNDRV_TIMER_EVENT_MCONTINUE
||
974 event
== SNDRV_TIMER_EVENT_MRESUME
) {
975 if (timer
->hw
.c_resolution
)
976 resolution
= timer
->hw
.c_resolution(timer
);
978 resolution
= timer
->hw
.resolution
;
980 list_for_each_entry(ti
, &timer
->active_list_head
, active_list
) {
982 ti
->ccallback(ti
, event
, tstamp
, resolution
);
983 list_for_each_entry(ts
, &ti
->slave_active_head
, active_list
)
985 ts
->ccallback(ts
, event
, tstamp
, resolution
);
987 spin_unlock_irqrestore(&timer
->lock
, flags
);
991 * exported functions for global timers
993 int snd_timer_global_new(char *id
, int device
, struct snd_timer
**rtimer
)
995 struct snd_timer_id tid
;
997 tid
.dev_class
= SNDRV_TIMER_CLASS_GLOBAL
;
998 tid
.dev_sclass
= SNDRV_TIMER_SCLASS_NONE
;
1000 tid
.device
= device
;
1002 return snd_timer_new(NULL
, id
, &tid
, rtimer
);
1005 int snd_timer_global_free(struct snd_timer
*timer
)
1007 return snd_timer_free(timer
);
1010 int snd_timer_global_register(struct snd_timer
*timer
)
1012 struct snd_device dev
;
1014 memset(&dev
, 0, sizeof(dev
));
1015 dev
.device_data
= timer
;
1016 return snd_timer_dev_register(&dev
);
1023 struct snd_timer_system_private
{
1024 struct timer_list tlist
;
1025 unsigned long last_expires
;
1026 unsigned long last_jiffies
;
1027 unsigned long correction
;
1030 static void snd_timer_s_function(unsigned long data
)
1032 struct snd_timer
*timer
= (struct snd_timer
*)data
;
1033 struct snd_timer_system_private
*priv
= timer
->private_data
;
1034 unsigned long jiff
= jiffies
;
1035 if (time_after(jiff
, priv
->last_expires
))
1036 priv
->correction
+= (long)jiff
- (long)priv
->last_expires
;
1037 snd_timer_interrupt(timer
, (long)jiff
- (long)priv
->last_jiffies
);
1040 static int snd_timer_s_start(struct snd_timer
* timer
)
1042 struct snd_timer_system_private
*priv
;
1043 unsigned long njiff
;
1045 priv
= (struct snd_timer_system_private
*) timer
->private_data
;
1046 njiff
= (priv
->last_jiffies
= jiffies
);
1047 if (priv
->correction
> timer
->sticks
- 1) {
1048 priv
->correction
-= timer
->sticks
- 1;
1051 njiff
+= timer
->sticks
- priv
->correction
;
1052 priv
->correction
= 0;
1054 priv
->last_expires
= njiff
;
1055 mod_timer(&priv
->tlist
, njiff
);
1059 static int snd_timer_s_stop(struct snd_timer
* timer
)
1061 struct snd_timer_system_private
*priv
;
1064 priv
= (struct snd_timer_system_private
*) timer
->private_data
;
1065 del_timer(&priv
->tlist
);
1067 if (time_before(jiff
, priv
->last_expires
))
1068 timer
->sticks
= priv
->last_expires
- jiff
;
1071 priv
->correction
= 0;
1075 static struct snd_timer_hardware snd_timer_system
=
1077 .flags
= SNDRV_TIMER_HW_FIRST
| SNDRV_TIMER_HW_TASKLET
,
1078 .resolution
= 1000000000L / HZ
,
1080 .start
= snd_timer_s_start
,
1081 .stop
= snd_timer_s_stop
1084 static void snd_timer_free_system(struct snd_timer
*timer
)
1086 kfree(timer
->private_data
);
1089 static int snd_timer_register_system(void)
1091 struct snd_timer
*timer
;
1092 struct snd_timer_system_private
*priv
;
1095 err
= snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM
, &timer
);
1098 strcpy(timer
->name
, "system timer");
1099 timer
->hw
= snd_timer_system
;
1100 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
1102 snd_timer_free(timer
);
1105 setup_timer(&priv
->tlist
, snd_timer_s_function
, (unsigned long) timer
);
1106 timer
->private_data
= priv
;
1107 timer
->private_free
= snd_timer_free_system
;
1108 return snd_timer_global_register(timer
);
1111 #ifdef CONFIG_SND_PROC_FS
1116 static void snd_timer_proc_read(struct snd_info_entry
*entry
,
1117 struct snd_info_buffer
*buffer
)
1119 struct snd_timer
*timer
;
1120 struct snd_timer_instance
*ti
;
1122 mutex_lock(®ister_mutex
);
1123 list_for_each_entry(timer
, &snd_timer_list
, device_list
) {
1124 if (timer
->card
&& timer
->card
->shutdown
)
1126 switch (timer
->tmr_class
) {
1127 case SNDRV_TIMER_CLASS_GLOBAL
:
1128 snd_iprintf(buffer
, "G%i: ", timer
->tmr_device
);
1130 case SNDRV_TIMER_CLASS_CARD
:
1131 snd_iprintf(buffer
, "C%i-%i: ",
1132 timer
->card
->number
, timer
->tmr_device
);
1134 case SNDRV_TIMER_CLASS_PCM
:
1135 snd_iprintf(buffer
, "P%i-%i-%i: ", timer
->card
->number
,
1136 timer
->tmr_device
, timer
->tmr_subdevice
);
1139 snd_iprintf(buffer
, "?%i-%i-%i-%i: ", timer
->tmr_class
,
1140 timer
->card
? timer
->card
->number
: -1,
1141 timer
->tmr_device
, timer
->tmr_subdevice
);
1143 snd_iprintf(buffer
, "%s :", timer
->name
);
1144 if (timer
->hw
.resolution
)
1145 snd_iprintf(buffer
, " %lu.%03luus (%lu ticks)",
1146 timer
->hw
.resolution
/ 1000,
1147 timer
->hw
.resolution
% 1000,
1149 if (timer
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)
1150 snd_iprintf(buffer
, " SLAVE");
1151 snd_iprintf(buffer
, "\n");
1152 list_for_each_entry(ti
, &timer
->open_list_head
, open_list
)
1153 snd_iprintf(buffer
, " Client %s : %s\n",
1154 ti
->owner
? ti
->owner
: "unknown",
1155 ti
->flags
& (SNDRV_TIMER_IFLG_START
|
1156 SNDRV_TIMER_IFLG_RUNNING
)
1157 ? "running" : "stopped");
1159 mutex_unlock(®ister_mutex
);
1162 static struct snd_info_entry
*snd_timer_proc_entry
;
1164 static void __init
snd_timer_proc_init(void)
1166 struct snd_info_entry
*entry
;
1168 entry
= snd_info_create_module_entry(THIS_MODULE
, "timers", NULL
);
1169 if (entry
!= NULL
) {
1170 entry
->c
.text
.read
= snd_timer_proc_read
;
1171 if (snd_info_register(entry
) < 0) {
1172 snd_info_free_entry(entry
);
1176 snd_timer_proc_entry
= entry
;
1179 static void __exit
snd_timer_proc_done(void)
1181 snd_info_free_entry(snd_timer_proc_entry
);
1183 #else /* !CONFIG_SND_PROC_FS */
1184 #define snd_timer_proc_init()
1185 #define snd_timer_proc_done()
1189 * USER SPACE interface
1192 static void snd_timer_user_interrupt(struct snd_timer_instance
*timeri
,
1193 unsigned long resolution
,
1194 unsigned long ticks
)
1196 struct snd_timer_user
*tu
= timeri
->callback_data
;
1197 struct snd_timer_read
*r
;
1200 spin_lock(&tu
->qlock
);
1201 if (tu
->qused
> 0) {
1202 prev
= tu
->qtail
== 0 ? tu
->queue_size
- 1 : tu
->qtail
- 1;
1203 r
= &tu
->queue
[prev
];
1204 if (r
->resolution
== resolution
) {
1209 if (tu
->qused
>= tu
->queue_size
) {
1212 r
= &tu
->queue
[tu
->qtail
++];
1213 tu
->qtail
%= tu
->queue_size
;
1214 r
->resolution
= resolution
;
1219 spin_unlock(&tu
->qlock
);
1220 kill_fasync(&tu
->fasync
, SIGIO
, POLL_IN
);
1221 wake_up(&tu
->qchange_sleep
);
1224 static void snd_timer_user_append_to_tqueue(struct snd_timer_user
*tu
,
1225 struct snd_timer_tread
*tread
)
1227 if (tu
->qused
>= tu
->queue_size
) {
1230 memcpy(&tu
->tqueue
[tu
->qtail
++], tread
, sizeof(*tread
));
1231 tu
->qtail
%= tu
->queue_size
;
1236 static void snd_timer_user_ccallback(struct snd_timer_instance
*timeri
,
1238 struct timespec
*tstamp
,
1239 unsigned long resolution
)
1241 struct snd_timer_user
*tu
= timeri
->callback_data
;
1242 struct snd_timer_tread r1
;
1243 unsigned long flags
;
1245 if (event
>= SNDRV_TIMER_EVENT_START
&&
1246 event
<= SNDRV_TIMER_EVENT_PAUSE
)
1247 tu
->tstamp
= *tstamp
;
1248 if ((tu
->filter
& (1 << event
)) == 0 || !tu
->tread
)
1251 r1
.tstamp
= *tstamp
;
1252 r1
.val
= resolution
;
1253 spin_lock_irqsave(&tu
->qlock
, flags
);
1254 snd_timer_user_append_to_tqueue(tu
, &r1
);
1255 spin_unlock_irqrestore(&tu
->qlock
, flags
);
1256 kill_fasync(&tu
->fasync
, SIGIO
, POLL_IN
);
1257 wake_up(&tu
->qchange_sleep
);
1260 static void snd_timer_user_tinterrupt(struct snd_timer_instance
*timeri
,
1261 unsigned long resolution
,
1262 unsigned long ticks
)
1264 struct snd_timer_user
*tu
= timeri
->callback_data
;
1265 struct snd_timer_tread
*r
, r1
;
1266 struct timespec tstamp
;
1267 int prev
, append
= 0;
1269 memset(&tstamp
, 0, sizeof(tstamp
));
1270 spin_lock(&tu
->qlock
);
1271 if ((tu
->filter
& ((1 << SNDRV_TIMER_EVENT_RESOLUTION
) |
1272 (1 << SNDRV_TIMER_EVENT_TICK
))) == 0) {
1273 spin_unlock(&tu
->qlock
);
1276 if (tu
->last_resolution
!= resolution
|| ticks
> 0) {
1277 if (timer_tstamp_monotonic
)
1278 ktime_get_ts(&tstamp
);
1280 getnstimeofday(&tstamp
);
1282 if ((tu
->filter
& (1 << SNDRV_TIMER_EVENT_RESOLUTION
)) &&
1283 tu
->last_resolution
!= resolution
) {
1284 r1
.event
= SNDRV_TIMER_EVENT_RESOLUTION
;
1286 r1
.val
= resolution
;
1287 snd_timer_user_append_to_tqueue(tu
, &r1
);
1288 tu
->last_resolution
= resolution
;
1291 if ((tu
->filter
& (1 << SNDRV_TIMER_EVENT_TICK
)) == 0)
1295 if (tu
->qused
> 0) {
1296 prev
= tu
->qtail
== 0 ? tu
->queue_size
- 1 : tu
->qtail
- 1;
1297 r
= &tu
->tqueue
[prev
];
1298 if (r
->event
== SNDRV_TIMER_EVENT_TICK
) {
1305 r1
.event
= SNDRV_TIMER_EVENT_TICK
;
1308 snd_timer_user_append_to_tqueue(tu
, &r1
);
1311 spin_unlock(&tu
->qlock
);
1314 kill_fasync(&tu
->fasync
, SIGIO
, POLL_IN
);
1315 wake_up(&tu
->qchange_sleep
);
1318 static int snd_timer_user_open(struct inode
*inode
, struct file
*file
)
1320 struct snd_timer_user
*tu
;
1323 err
= nonseekable_open(inode
, file
);
1327 tu
= kzalloc(sizeof(*tu
), GFP_KERNEL
);
1330 spin_lock_init(&tu
->qlock
);
1331 init_waitqueue_head(&tu
->qchange_sleep
);
1332 mutex_init(&tu
->ioctl_lock
);
1334 tu
->queue_size
= 128;
1335 tu
->queue
= kmalloc(tu
->queue_size
* sizeof(struct snd_timer_read
),
1337 if (tu
->queue
== NULL
) {
1341 file
->private_data
= tu
;
1345 static int snd_timer_user_release(struct inode
*inode
, struct file
*file
)
1347 struct snd_timer_user
*tu
;
1349 if (file
->private_data
) {
1350 tu
= file
->private_data
;
1351 file
->private_data
= NULL
;
1352 mutex_lock(&tu
->ioctl_lock
);
1354 snd_timer_close(tu
->timeri
);
1355 mutex_unlock(&tu
->ioctl_lock
);
1363 static void snd_timer_user_zero_id(struct snd_timer_id
*id
)
1365 id
->dev_class
= SNDRV_TIMER_CLASS_NONE
;
1366 id
->dev_sclass
= SNDRV_TIMER_SCLASS_NONE
;
1372 static void snd_timer_user_copy_id(struct snd_timer_id
*id
, struct snd_timer
*timer
)
1374 id
->dev_class
= timer
->tmr_class
;
1375 id
->dev_sclass
= SNDRV_TIMER_SCLASS_NONE
;
1376 id
->card
= timer
->card
? timer
->card
->number
: -1;
1377 id
->device
= timer
->tmr_device
;
1378 id
->subdevice
= timer
->tmr_subdevice
;
1381 static int snd_timer_user_next_device(struct snd_timer_id __user
*_tid
)
1383 struct snd_timer_id id
;
1384 struct snd_timer
*timer
;
1385 struct list_head
*p
;
1387 if (copy_from_user(&id
, _tid
, sizeof(id
)))
1389 mutex_lock(®ister_mutex
);
1390 if (id
.dev_class
< 0) { /* first item */
1391 if (list_empty(&snd_timer_list
))
1392 snd_timer_user_zero_id(&id
);
1394 timer
= list_entry(snd_timer_list
.next
,
1395 struct snd_timer
, device_list
);
1396 snd_timer_user_copy_id(&id
, timer
);
1399 switch (id
.dev_class
) {
1400 case SNDRV_TIMER_CLASS_GLOBAL
:
1401 id
.device
= id
.device
< 0 ? 0 : id
.device
+ 1;
1402 list_for_each(p
, &snd_timer_list
) {
1403 timer
= list_entry(p
, struct snd_timer
, device_list
);
1404 if (timer
->tmr_class
> SNDRV_TIMER_CLASS_GLOBAL
) {
1405 snd_timer_user_copy_id(&id
, timer
);
1408 if (timer
->tmr_device
>= id
.device
) {
1409 snd_timer_user_copy_id(&id
, timer
);
1413 if (p
== &snd_timer_list
)
1414 snd_timer_user_zero_id(&id
);
1416 case SNDRV_TIMER_CLASS_CARD
:
1417 case SNDRV_TIMER_CLASS_PCM
:
1424 if (id
.device
< 0) {
1427 if (id
.subdevice
< 0) {
1435 list_for_each(p
, &snd_timer_list
) {
1436 timer
= list_entry(p
, struct snd_timer
, device_list
);
1437 if (timer
->tmr_class
> id
.dev_class
) {
1438 snd_timer_user_copy_id(&id
, timer
);
1441 if (timer
->tmr_class
< id
.dev_class
)
1443 if (timer
->card
->number
> id
.card
) {
1444 snd_timer_user_copy_id(&id
, timer
);
1447 if (timer
->card
->number
< id
.card
)
1449 if (timer
->tmr_device
> id
.device
) {
1450 snd_timer_user_copy_id(&id
, timer
);
1453 if (timer
->tmr_device
< id
.device
)
1455 if (timer
->tmr_subdevice
> id
.subdevice
) {
1456 snd_timer_user_copy_id(&id
, timer
);
1459 if (timer
->tmr_subdevice
< id
.subdevice
)
1461 snd_timer_user_copy_id(&id
, timer
);
1464 if (p
== &snd_timer_list
)
1465 snd_timer_user_zero_id(&id
);
1468 snd_timer_user_zero_id(&id
);
1471 mutex_unlock(®ister_mutex
);
1472 if (copy_to_user(_tid
, &id
, sizeof(*_tid
)))
1477 static int snd_timer_user_ginfo(struct file
*file
,
1478 struct snd_timer_ginfo __user
*_ginfo
)
1480 struct snd_timer_ginfo
*ginfo
;
1481 struct snd_timer_id tid
;
1482 struct snd_timer
*t
;
1483 struct list_head
*p
;
1486 ginfo
= memdup_user(_ginfo
, sizeof(*ginfo
));
1488 return PTR_ERR(ginfo
);
1491 memset(ginfo
, 0, sizeof(*ginfo
));
1493 mutex_lock(®ister_mutex
);
1494 t
= snd_timer_find(&tid
);
1496 ginfo
->card
= t
->card
? t
->card
->number
: -1;
1497 if (t
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)
1498 ginfo
->flags
|= SNDRV_TIMER_FLG_SLAVE
;
1499 strlcpy(ginfo
->id
, t
->id
, sizeof(ginfo
->id
));
1500 strlcpy(ginfo
->name
, t
->name
, sizeof(ginfo
->name
));
1501 ginfo
->resolution
= t
->hw
.resolution
;
1502 if (t
->hw
.resolution_min
> 0) {
1503 ginfo
->resolution_min
= t
->hw
.resolution_min
;
1504 ginfo
->resolution_max
= t
->hw
.resolution_max
;
1506 list_for_each(p
, &t
->open_list_head
) {
1512 mutex_unlock(®ister_mutex
);
1513 if (err
>= 0 && copy_to_user(_ginfo
, ginfo
, sizeof(*ginfo
)))
1519 static int snd_timer_user_gparams(struct file
*file
,
1520 struct snd_timer_gparams __user
*_gparams
)
1522 struct snd_timer_gparams gparams
;
1523 struct snd_timer
*t
;
1526 if (copy_from_user(&gparams
, _gparams
, sizeof(gparams
)))
1528 mutex_lock(®ister_mutex
);
1529 t
= snd_timer_find(&gparams
.tid
);
1534 if (!list_empty(&t
->open_list_head
)) {
1538 if (!t
->hw
.set_period
) {
1542 err
= t
->hw
.set_period(t
, gparams
.period_num
, gparams
.period_den
);
1544 mutex_unlock(®ister_mutex
);
1548 static int snd_timer_user_gstatus(struct file
*file
,
1549 struct snd_timer_gstatus __user
*_gstatus
)
1551 struct snd_timer_gstatus gstatus
;
1552 struct snd_timer_id tid
;
1553 struct snd_timer
*t
;
1556 if (copy_from_user(&gstatus
, _gstatus
, sizeof(gstatus
)))
1559 memset(&gstatus
, 0, sizeof(gstatus
));
1561 mutex_lock(®ister_mutex
);
1562 t
= snd_timer_find(&tid
);
1564 if (t
->hw
.c_resolution
)
1565 gstatus
.resolution
= t
->hw
.c_resolution(t
);
1567 gstatus
.resolution
= t
->hw
.resolution
;
1568 if (t
->hw
.precise_resolution
) {
1569 t
->hw
.precise_resolution(t
, &gstatus
.resolution_num
,
1570 &gstatus
.resolution_den
);
1572 gstatus
.resolution_num
= gstatus
.resolution
;
1573 gstatus
.resolution_den
= 1000000000uL;
1578 mutex_unlock(®ister_mutex
);
1579 if (err
>= 0 && copy_to_user(_gstatus
, &gstatus
, sizeof(gstatus
)))
1584 static int snd_timer_user_tselect(struct file
*file
,
1585 struct snd_timer_select __user
*_tselect
)
1587 struct snd_timer_user
*tu
;
1588 struct snd_timer_select tselect
;
1592 tu
= file
->private_data
;
1594 snd_timer_close(tu
->timeri
);
1597 if (copy_from_user(&tselect
, _tselect
, sizeof(tselect
))) {
1601 sprintf(str
, "application %i", current
->pid
);
1602 if (tselect
.id
.dev_class
!= SNDRV_TIMER_CLASS_SLAVE
)
1603 tselect
.id
.dev_sclass
= SNDRV_TIMER_SCLASS_APPLICATION
;
1604 err
= snd_timer_open(&tu
->timeri
, str
, &tselect
.id
, current
->pid
);
1613 tu
->tqueue
= kmalloc(tu
->queue_size
* sizeof(struct snd_timer_tread
),
1615 if (tu
->tqueue
== NULL
)
1618 tu
->queue
= kmalloc(tu
->queue_size
* sizeof(struct snd_timer_read
),
1620 if (tu
->queue
== NULL
)
1625 snd_timer_close(tu
->timeri
);
1628 tu
->timeri
->flags
|= SNDRV_TIMER_IFLG_FAST
;
1629 tu
->timeri
->callback
= tu
->tread
1630 ? snd_timer_user_tinterrupt
: snd_timer_user_interrupt
;
1631 tu
->timeri
->ccallback
= snd_timer_user_ccallback
;
1632 tu
->timeri
->callback_data
= (void *)tu
;
1639 static int snd_timer_user_info(struct file
*file
,
1640 struct snd_timer_info __user
*_info
)
1642 struct snd_timer_user
*tu
;
1643 struct snd_timer_info
*info
;
1644 struct snd_timer
*t
;
1647 tu
= file
->private_data
;
1650 t
= tu
->timeri
->timer
;
1654 info
= kzalloc(sizeof(*info
), GFP_KERNEL
);
1657 info
->card
= t
->card
? t
->card
->number
: -1;
1658 if (t
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)
1659 info
->flags
|= SNDRV_TIMER_FLG_SLAVE
;
1660 strlcpy(info
->id
, t
->id
, sizeof(info
->id
));
1661 strlcpy(info
->name
, t
->name
, sizeof(info
->name
));
1662 info
->resolution
= t
->hw
.resolution
;
1663 if (copy_to_user(_info
, info
, sizeof(*_info
)))
1669 static int snd_timer_user_params(struct file
*file
,
1670 struct snd_timer_params __user
*_params
)
1672 struct snd_timer_user
*tu
;
1673 struct snd_timer_params params
;
1674 struct snd_timer
*t
;
1675 struct snd_timer_read
*tr
;
1676 struct snd_timer_tread
*ttr
;
1679 tu
= file
->private_data
;
1682 t
= tu
->timeri
->timer
;
1685 if (copy_from_user(¶ms
, _params
, sizeof(params
)))
1687 if (!(t
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
) && params
.ticks
< 1) {
1691 if (params
.queue_size
> 0 &&
1692 (params
.queue_size
< 32 || params
.queue_size
> 1024)) {
1696 if (params
.filter
& ~((1<<SNDRV_TIMER_EVENT_RESOLUTION
)|
1697 (1<<SNDRV_TIMER_EVENT_TICK
)|
1698 (1<<SNDRV_TIMER_EVENT_START
)|
1699 (1<<SNDRV_TIMER_EVENT_STOP
)|
1700 (1<<SNDRV_TIMER_EVENT_CONTINUE
)|
1701 (1<<SNDRV_TIMER_EVENT_PAUSE
)|
1702 (1<<SNDRV_TIMER_EVENT_SUSPEND
)|
1703 (1<<SNDRV_TIMER_EVENT_RESUME
)|
1704 (1<<SNDRV_TIMER_EVENT_MSTART
)|
1705 (1<<SNDRV_TIMER_EVENT_MSTOP
)|
1706 (1<<SNDRV_TIMER_EVENT_MCONTINUE
)|
1707 (1<<SNDRV_TIMER_EVENT_MPAUSE
)|
1708 (1<<SNDRV_TIMER_EVENT_MSUSPEND
)|
1709 (1<<SNDRV_TIMER_EVENT_MRESUME
))) {
1713 snd_timer_stop(tu
->timeri
);
1714 spin_lock_irq(&t
->lock
);
1715 tu
->timeri
->flags
&= ~(SNDRV_TIMER_IFLG_AUTO
|
1716 SNDRV_TIMER_IFLG_EXCLUSIVE
|
1717 SNDRV_TIMER_IFLG_EARLY_EVENT
);
1718 if (params
.flags
& SNDRV_TIMER_PSFLG_AUTO
)
1719 tu
->timeri
->flags
|= SNDRV_TIMER_IFLG_AUTO
;
1720 if (params
.flags
& SNDRV_TIMER_PSFLG_EXCLUSIVE
)
1721 tu
->timeri
->flags
|= SNDRV_TIMER_IFLG_EXCLUSIVE
;
1722 if (params
.flags
& SNDRV_TIMER_PSFLG_EARLY_EVENT
)
1723 tu
->timeri
->flags
|= SNDRV_TIMER_IFLG_EARLY_EVENT
;
1724 spin_unlock_irq(&t
->lock
);
1725 if (params
.queue_size
> 0 &&
1726 (unsigned int)tu
->queue_size
!= params
.queue_size
) {
1728 ttr
= kmalloc(params
.queue_size
* sizeof(*ttr
),
1732 tu
->queue_size
= params
.queue_size
;
1736 tr
= kmalloc(params
.queue_size
* sizeof(*tr
),
1740 tu
->queue_size
= params
.queue_size
;
1745 tu
->qhead
= tu
->qtail
= tu
->qused
= 0;
1746 if (tu
->timeri
->flags
& SNDRV_TIMER_IFLG_EARLY_EVENT
) {
1748 struct snd_timer_tread tread
;
1749 memset(&tread
, 0, sizeof(tread
));
1750 tread
.event
= SNDRV_TIMER_EVENT_EARLY
;
1751 tread
.tstamp
.tv_sec
= 0;
1752 tread
.tstamp
.tv_nsec
= 0;
1754 snd_timer_user_append_to_tqueue(tu
, &tread
);
1756 struct snd_timer_read
*r
= &tu
->queue
[0];
1763 tu
->filter
= params
.filter
;
1764 tu
->ticks
= params
.ticks
;
1767 if (copy_to_user(_params
, ¶ms
, sizeof(params
)))
1772 static int snd_timer_user_status(struct file
*file
,
1773 struct snd_timer_status __user
*_status
)
1775 struct snd_timer_user
*tu
;
1776 struct snd_timer_status status
;
1778 tu
= file
->private_data
;
1781 memset(&status
, 0, sizeof(status
));
1782 status
.tstamp
= tu
->tstamp
;
1783 status
.resolution
= snd_timer_resolution(tu
->timeri
);
1784 status
.lost
= tu
->timeri
->lost
;
1785 status
.overrun
= tu
->overrun
;
1786 spin_lock_irq(&tu
->qlock
);
1787 status
.queue
= tu
->qused
;
1788 spin_unlock_irq(&tu
->qlock
);
1789 if (copy_to_user(_status
, &status
, sizeof(status
)))
1794 static int snd_timer_user_start(struct file
*file
)
1797 struct snd_timer_user
*tu
;
1799 tu
= file
->private_data
;
1802 snd_timer_stop(tu
->timeri
);
1803 tu
->timeri
->lost
= 0;
1804 tu
->last_resolution
= 0;
1805 return (err
= snd_timer_start(tu
->timeri
, tu
->ticks
)) < 0 ? err
: 0;
1808 static int snd_timer_user_stop(struct file
*file
)
1811 struct snd_timer_user
*tu
;
1813 tu
= file
->private_data
;
1816 return (err
= snd_timer_stop(tu
->timeri
)) < 0 ? err
: 0;
1819 static int snd_timer_user_continue(struct file
*file
)
1822 struct snd_timer_user
*tu
;
1824 tu
= file
->private_data
;
1827 tu
->timeri
->lost
= 0;
1828 return (err
= snd_timer_continue(tu
->timeri
)) < 0 ? err
: 0;
1831 static int snd_timer_user_pause(struct file
*file
)
1834 struct snd_timer_user
*tu
;
1836 tu
= file
->private_data
;
1839 return (err
= snd_timer_pause(tu
->timeri
)) < 0 ? err
: 0;
1843 SNDRV_TIMER_IOCTL_START_OLD
= _IO('T', 0x20),
1844 SNDRV_TIMER_IOCTL_STOP_OLD
= _IO('T', 0x21),
1845 SNDRV_TIMER_IOCTL_CONTINUE_OLD
= _IO('T', 0x22),
1846 SNDRV_TIMER_IOCTL_PAUSE_OLD
= _IO('T', 0x23),
1849 static long __snd_timer_user_ioctl(struct file
*file
, unsigned int cmd
,
1852 struct snd_timer_user
*tu
;
1853 void __user
*argp
= (void __user
*)arg
;
1854 int __user
*p
= argp
;
1856 tu
= file
->private_data
;
1858 case SNDRV_TIMER_IOCTL_PVERSION
:
1859 return put_user(SNDRV_TIMER_VERSION
, p
) ? -EFAULT
: 0;
1860 case SNDRV_TIMER_IOCTL_NEXT_DEVICE
:
1861 return snd_timer_user_next_device(argp
);
1862 case SNDRV_TIMER_IOCTL_TREAD
:
1866 if (tu
->timeri
) /* too late */
1868 if (get_user(xarg
, p
))
1870 tu
->tread
= xarg
? 1 : 0;
1873 case SNDRV_TIMER_IOCTL_GINFO
:
1874 return snd_timer_user_ginfo(file
, argp
);
1875 case SNDRV_TIMER_IOCTL_GPARAMS
:
1876 return snd_timer_user_gparams(file
, argp
);
1877 case SNDRV_TIMER_IOCTL_GSTATUS
:
1878 return snd_timer_user_gstatus(file
, argp
);
1879 case SNDRV_TIMER_IOCTL_SELECT
:
1880 return snd_timer_user_tselect(file
, argp
);
1881 case SNDRV_TIMER_IOCTL_INFO
:
1882 return snd_timer_user_info(file
, argp
);
1883 case SNDRV_TIMER_IOCTL_PARAMS
:
1884 return snd_timer_user_params(file
, argp
);
1885 case SNDRV_TIMER_IOCTL_STATUS
:
1886 return snd_timer_user_status(file
, argp
);
1887 case SNDRV_TIMER_IOCTL_START
:
1888 case SNDRV_TIMER_IOCTL_START_OLD
:
1889 return snd_timer_user_start(file
);
1890 case SNDRV_TIMER_IOCTL_STOP
:
1891 case SNDRV_TIMER_IOCTL_STOP_OLD
:
1892 return snd_timer_user_stop(file
);
1893 case SNDRV_TIMER_IOCTL_CONTINUE
:
1894 case SNDRV_TIMER_IOCTL_CONTINUE_OLD
:
1895 return snd_timer_user_continue(file
);
1896 case SNDRV_TIMER_IOCTL_PAUSE
:
1897 case SNDRV_TIMER_IOCTL_PAUSE_OLD
:
1898 return snd_timer_user_pause(file
);
1903 static long snd_timer_user_ioctl(struct file
*file
, unsigned int cmd
,
1906 struct snd_timer_user
*tu
= file
->private_data
;
1909 mutex_lock(&tu
->ioctl_lock
);
1910 ret
= __snd_timer_user_ioctl(file
, cmd
, arg
);
1911 mutex_unlock(&tu
->ioctl_lock
);
1915 static int snd_timer_user_fasync(int fd
, struct file
* file
, int on
)
1917 struct snd_timer_user
*tu
;
1919 tu
= file
->private_data
;
1920 return fasync_helper(fd
, file
, on
, &tu
->fasync
);
1923 static ssize_t
snd_timer_user_read(struct file
*file
, char __user
*buffer
,
1924 size_t count
, loff_t
*offset
)
1926 struct snd_timer_user
*tu
;
1927 long result
= 0, unit
;
1931 tu
= file
->private_data
;
1932 unit
= tu
->tread
? sizeof(struct snd_timer_tread
) : sizeof(struct snd_timer_read
);
1933 spin_lock_irq(&tu
->qlock
);
1934 while ((long)count
- result
>= unit
) {
1935 while (!tu
->qused
) {
1938 if ((file
->f_flags
& O_NONBLOCK
) != 0 || result
> 0) {
1943 set_current_state(TASK_INTERRUPTIBLE
);
1944 init_waitqueue_entry(&wait
, current
);
1945 add_wait_queue(&tu
->qchange_sleep
, &wait
);
1947 spin_unlock_irq(&tu
->qlock
);
1949 spin_lock_irq(&tu
->qlock
);
1951 remove_wait_queue(&tu
->qchange_sleep
, &wait
);
1953 if (tu
->disconnected
) {
1957 if (signal_pending(current
)) {
1963 qhead
= tu
->qhead
++;
1964 tu
->qhead
%= tu
->queue_size
;
1965 spin_unlock_irq(&tu
->qlock
);
1968 if (copy_to_user(buffer
, &tu
->tqueue
[qhead
],
1969 sizeof(struct snd_timer_tread
)))
1972 if (copy_to_user(buffer
, &tu
->queue
[qhead
],
1973 sizeof(struct snd_timer_read
)))
1977 spin_lock_irq(&tu
->qlock
);
1985 spin_unlock_irq(&tu
->qlock
);
1986 return result
> 0 ? result
: err
;
1989 static unsigned int snd_timer_user_poll(struct file
*file
, poll_table
* wait
)
1992 struct snd_timer_user
*tu
;
1994 tu
= file
->private_data
;
1996 poll_wait(file
, &tu
->qchange_sleep
, wait
);
2000 mask
|= POLLIN
| POLLRDNORM
;
2001 if (tu
->disconnected
)
2007 #ifdef CONFIG_COMPAT
2008 #include "timer_compat.c"
2010 #define snd_timer_user_ioctl_compat NULL
2013 static const struct file_operations snd_timer_f_ops
=
2015 .owner
= THIS_MODULE
,
2016 .read
= snd_timer_user_read
,
2017 .open
= snd_timer_user_open
,
2018 .release
= snd_timer_user_release
,
2019 .llseek
= no_llseek
,
2020 .poll
= snd_timer_user_poll
,
2021 .unlocked_ioctl
= snd_timer_user_ioctl
,
2022 .compat_ioctl
= snd_timer_user_ioctl_compat
,
2023 .fasync
= snd_timer_user_fasync
,
2026 /* unregister the system timer */
2027 static void snd_timer_free_all(void)
2029 struct snd_timer
*timer
, *n
;
2031 list_for_each_entry_safe(timer
, n
, &snd_timer_list
, device_list
)
2032 snd_timer_free(timer
);
2035 static struct device timer_dev
;
2041 static int __init
alsa_timer_init(void)
2045 snd_device_initialize(&timer_dev
, NULL
);
2046 dev_set_name(&timer_dev
, "timer");
2048 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2049 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS
, SNDRV_CARDS
- 1,
2053 err
= snd_timer_register_system();
2055 pr_err("ALSA: unable to register system timer (%i)\n", err
);
2056 put_device(&timer_dev
);
2060 err
= snd_register_device(SNDRV_DEVICE_TYPE_TIMER
, NULL
, 0,
2061 &snd_timer_f_ops
, NULL
, &timer_dev
);
2063 pr_err("ALSA: unable to register timer device (%i)\n", err
);
2064 snd_timer_free_all();
2065 put_device(&timer_dev
);
2069 snd_timer_proc_init();
2073 static void __exit
alsa_timer_exit(void)
2075 snd_unregister_device(&timer_dev
);
2076 snd_timer_free_all();
2077 put_device(&timer_dev
);
2078 snd_timer_proc_done();
2079 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2080 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS
, SNDRV_CARDS
- 1);
2084 module_init(alsa_timer_init
)
2085 module_exit(alsa_timer_exit
)
2087 EXPORT_SYMBOL(snd_timer_open
);
2088 EXPORT_SYMBOL(snd_timer_close
);
2089 EXPORT_SYMBOL(snd_timer_resolution
);
2090 EXPORT_SYMBOL(snd_timer_start
);
2091 EXPORT_SYMBOL(snd_timer_stop
);
2092 EXPORT_SYMBOL(snd_timer_continue
);
2093 EXPORT_SYMBOL(snd_timer_pause
);
2094 EXPORT_SYMBOL(snd_timer_new
);
2095 EXPORT_SYMBOL(snd_timer_notify
);
2096 EXPORT_SYMBOL(snd_timer_global_new
);
2097 EXPORT_SYMBOL(snd_timer_global_free
);
2098 EXPORT_SYMBOL(snd_timer_global_register
);
2099 EXPORT_SYMBOL(snd_timer_interrupt
);