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 <linux/sched/signal.h>
31 #include <sound/core.h>
32 #include <sound/timer.h>
33 #include <sound/control.h>
34 #include <sound/info.h>
35 #include <sound/minors.h>
36 #include <sound/initval.h>
37 #include <linux/kmod.h>
40 #define SNDRV_TIMER_IFLG_PAUSED 0x00010000
42 #if IS_ENABLED(CONFIG_SND_HRTIMER)
43 #define DEFAULT_TIMER_LIMIT 4
45 #define DEFAULT_TIMER_LIMIT 1
48 static int timer_limit
= DEFAULT_TIMER_LIMIT
;
49 static int timer_tstamp_monotonic
= 1;
50 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
51 MODULE_DESCRIPTION("ALSA timer interface");
52 MODULE_LICENSE("GPL");
53 module_param(timer_limit
, int, 0444);
54 MODULE_PARM_DESC(timer_limit
, "Maximum global timers in system.");
55 module_param(timer_tstamp_monotonic
, int, 0444);
56 MODULE_PARM_DESC(timer_tstamp_monotonic
, "Use posix monotonic clock source for timestamps (default).");
58 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR
, SNDRV_MINOR_TIMER
);
59 MODULE_ALIAS("devname:snd/timer");
61 struct snd_timer_user
{
62 struct snd_timer_instance
*timeri
;
63 int tread
; /* enhanced read with timestamps and events */
65 unsigned long overrun
;
71 struct snd_timer_read
*queue
;
72 struct snd_timer_tread
*tqueue
;
74 unsigned long last_resolution
;
76 struct timespec tstamp
; /* trigger tstamp */
77 wait_queue_head_t qchange_sleep
;
78 struct fasync_struct
*fasync
;
79 struct mutex ioctl_lock
;
83 static LIST_HEAD(snd_timer_list
);
85 /* list of slave instances */
86 static LIST_HEAD(snd_timer_slave_list
);
88 /* lock for slave active lists */
89 static DEFINE_SPINLOCK(slave_active_lock
);
91 static DEFINE_MUTEX(register_mutex
);
93 static int snd_timer_free(struct snd_timer
*timer
);
94 static int snd_timer_dev_free(struct snd_device
*device
);
95 static int snd_timer_dev_register(struct snd_device
*device
);
96 static int snd_timer_dev_disconnect(struct snd_device
*device
);
98 static void snd_timer_reschedule(struct snd_timer
* timer
, unsigned long ticks_left
);
101 * create a timer instance with the given owner string.
102 * when timer is not NULL, increments the module counter
104 static struct snd_timer_instance
*snd_timer_instance_new(char *owner
,
105 struct snd_timer
*timer
)
107 struct snd_timer_instance
*timeri
;
108 timeri
= kzalloc(sizeof(*timeri
), GFP_KERNEL
);
111 timeri
->owner
= kstrdup(owner
, GFP_KERNEL
);
112 if (! timeri
->owner
) {
116 INIT_LIST_HEAD(&timeri
->open_list
);
117 INIT_LIST_HEAD(&timeri
->active_list
);
118 INIT_LIST_HEAD(&timeri
->ack_list
);
119 INIT_LIST_HEAD(&timeri
->slave_list_head
);
120 INIT_LIST_HEAD(&timeri
->slave_active_head
);
122 timeri
->timer
= timer
;
123 if (timer
&& !try_module_get(timer
->module
)) {
124 kfree(timeri
->owner
);
133 * find a timer instance from the given timer id
135 static struct snd_timer
*snd_timer_find(struct snd_timer_id
*tid
)
137 struct snd_timer
*timer
= NULL
;
139 list_for_each_entry(timer
, &snd_timer_list
, device_list
) {
140 if (timer
->tmr_class
!= tid
->dev_class
)
142 if ((timer
->tmr_class
== SNDRV_TIMER_CLASS_CARD
||
143 timer
->tmr_class
== SNDRV_TIMER_CLASS_PCM
) &&
144 (timer
->card
== NULL
||
145 timer
->card
->number
!= tid
->card
))
147 if (timer
->tmr_device
!= tid
->device
)
149 if (timer
->tmr_subdevice
!= tid
->subdevice
)
156 #ifdef CONFIG_MODULES
158 static void snd_timer_request(struct snd_timer_id
*tid
)
160 switch (tid
->dev_class
) {
161 case SNDRV_TIMER_CLASS_GLOBAL
:
162 if (tid
->device
< timer_limit
)
163 request_module("snd-timer-%i", tid
->device
);
165 case SNDRV_TIMER_CLASS_CARD
:
166 case SNDRV_TIMER_CLASS_PCM
:
167 if (tid
->card
< snd_ecards_limit
)
168 request_module("snd-card-%i", tid
->card
);
178 * look for a master instance matching with the slave id of the given slave.
179 * when found, relink the open_link of the slave.
181 * call this with register_mutex down.
183 static void snd_timer_check_slave(struct snd_timer_instance
*slave
)
185 struct snd_timer
*timer
;
186 struct snd_timer_instance
*master
;
188 /* FIXME: it's really dumb to look up all entries.. */
189 list_for_each_entry(timer
, &snd_timer_list
, device_list
) {
190 list_for_each_entry(master
, &timer
->open_list_head
, open_list
) {
191 if (slave
->slave_class
== master
->slave_class
&&
192 slave
->slave_id
== master
->slave_id
) {
193 list_move_tail(&slave
->open_list
,
194 &master
->slave_list_head
);
195 spin_lock_irq(&slave_active_lock
);
196 slave
->master
= master
;
197 slave
->timer
= master
->timer
;
198 spin_unlock_irq(&slave_active_lock
);
206 * look for slave instances matching with the slave id of the given master.
207 * when found, relink the open_link of slaves.
209 * call this with register_mutex down.
211 static void snd_timer_check_master(struct snd_timer_instance
*master
)
213 struct snd_timer_instance
*slave
, *tmp
;
215 /* check all pending slaves */
216 list_for_each_entry_safe(slave
, tmp
, &snd_timer_slave_list
, open_list
) {
217 if (slave
->slave_class
== master
->slave_class
&&
218 slave
->slave_id
== master
->slave_id
) {
219 list_move_tail(&slave
->open_list
, &master
->slave_list_head
);
220 spin_lock_irq(&slave_active_lock
);
221 spin_lock(&master
->timer
->lock
);
222 slave
->master
= master
;
223 slave
->timer
= master
->timer
;
224 if (slave
->flags
& SNDRV_TIMER_IFLG_RUNNING
)
225 list_add_tail(&slave
->active_list
,
226 &master
->slave_active_head
);
227 spin_unlock(&master
->timer
->lock
);
228 spin_unlock_irq(&slave_active_lock
);
234 * open a timer instance
235 * when opening a master, the slave id must be here given.
237 int snd_timer_open(struct snd_timer_instance
**ti
,
238 char *owner
, struct snd_timer_id
*tid
,
239 unsigned int slave_id
)
241 struct snd_timer
*timer
;
242 struct snd_timer_instance
*timeri
= NULL
;
244 if (tid
->dev_class
== SNDRV_TIMER_CLASS_SLAVE
) {
245 /* open a slave instance */
246 if (tid
->dev_sclass
<= SNDRV_TIMER_SCLASS_NONE
||
247 tid
->dev_sclass
> SNDRV_TIMER_SCLASS_OSS_SEQUENCER
) {
248 pr_debug("ALSA: timer: invalid slave class %i\n",
252 mutex_lock(®ister_mutex
);
253 timeri
= snd_timer_instance_new(owner
, NULL
);
255 mutex_unlock(®ister_mutex
);
258 timeri
->slave_class
= tid
->dev_sclass
;
259 timeri
->slave_id
= tid
->device
;
260 timeri
->flags
|= SNDRV_TIMER_IFLG_SLAVE
;
261 list_add_tail(&timeri
->open_list
, &snd_timer_slave_list
);
262 snd_timer_check_slave(timeri
);
263 mutex_unlock(®ister_mutex
);
268 /* open a master instance */
269 mutex_lock(®ister_mutex
);
270 timer
= snd_timer_find(tid
);
271 #ifdef CONFIG_MODULES
273 mutex_unlock(®ister_mutex
);
274 snd_timer_request(tid
);
275 mutex_lock(®ister_mutex
);
276 timer
= snd_timer_find(tid
);
280 mutex_unlock(®ister_mutex
);
283 if (!list_empty(&timer
->open_list_head
)) {
284 timeri
= list_entry(timer
->open_list_head
.next
,
285 struct snd_timer_instance
, open_list
);
286 if (timeri
->flags
& SNDRV_TIMER_IFLG_EXCLUSIVE
) {
287 mutex_unlock(®ister_mutex
);
291 timeri
= snd_timer_instance_new(owner
, timer
);
293 mutex_unlock(®ister_mutex
);
296 /* take a card refcount for safe disconnection */
298 get_device(&timer
->card
->card_dev
);
299 timeri
->slave_class
= tid
->dev_sclass
;
300 timeri
->slave_id
= slave_id
;
302 if (list_empty(&timer
->open_list_head
) && timer
->hw
.open
) {
303 int err
= timer
->hw
.open(timer
);
305 kfree(timeri
->owner
);
309 put_device(&timer
->card
->card_dev
);
310 module_put(timer
->module
);
311 mutex_unlock(®ister_mutex
);
316 list_add_tail(&timeri
->open_list
, &timer
->open_list_head
);
317 snd_timer_check_master(timeri
);
318 mutex_unlock(®ister_mutex
);
324 * close a timer instance
326 int snd_timer_close(struct snd_timer_instance
*timeri
)
328 struct snd_timer
*timer
= NULL
;
329 struct snd_timer_instance
*slave
, *tmp
;
331 if (snd_BUG_ON(!timeri
))
334 mutex_lock(®ister_mutex
);
335 list_del(&timeri
->open_list
);
337 /* force to stop the timer */
338 snd_timer_stop(timeri
);
340 timer
= timeri
->timer
;
342 /* wait, until the active callback is finished */
343 spin_lock_irq(&timer
->lock
);
344 while (timeri
->flags
& SNDRV_TIMER_IFLG_CALLBACK
) {
345 spin_unlock_irq(&timer
->lock
);
347 spin_lock_irq(&timer
->lock
);
349 spin_unlock_irq(&timer
->lock
);
351 /* remove slave links */
352 spin_lock_irq(&slave_active_lock
);
353 spin_lock(&timer
->lock
);
354 list_for_each_entry_safe(slave
, tmp
, &timeri
->slave_list_head
,
356 list_move_tail(&slave
->open_list
, &snd_timer_slave_list
);
357 slave
->master
= NULL
;
359 list_del_init(&slave
->ack_list
);
360 list_del_init(&slave
->active_list
);
362 spin_unlock(&timer
->lock
);
363 spin_unlock_irq(&slave_active_lock
);
365 /* slave doesn't need to release timer resources below */
366 if (timeri
->flags
& SNDRV_TIMER_IFLG_SLAVE
)
370 if (timeri
->private_free
)
371 timeri
->private_free(timeri
);
372 kfree(timeri
->owner
);
376 if (list_empty(&timer
->open_list_head
) && timer
->hw
.close
)
377 timer
->hw
.close(timer
);
378 /* release a card refcount for safe disconnection */
380 put_device(&timer
->card
->card_dev
);
381 module_put(timer
->module
);
384 mutex_unlock(®ister_mutex
);
388 unsigned long snd_timer_resolution(struct snd_timer_instance
*timeri
)
390 struct snd_timer
* timer
;
394 if ((timer
= timeri
->timer
) != NULL
) {
395 if (timer
->hw
.c_resolution
)
396 return timer
->hw
.c_resolution(timer
);
397 return timer
->hw
.resolution
;
402 static void snd_timer_notify1(struct snd_timer_instance
*ti
, int event
)
404 struct snd_timer
*timer
;
405 unsigned long resolution
= 0;
406 struct snd_timer_instance
*ts
;
407 struct timespec tstamp
;
409 if (timer_tstamp_monotonic
)
410 ktime_get_ts(&tstamp
);
412 getnstimeofday(&tstamp
);
413 if (snd_BUG_ON(event
< SNDRV_TIMER_EVENT_START
||
414 event
> SNDRV_TIMER_EVENT_PAUSE
))
416 if (event
== SNDRV_TIMER_EVENT_START
||
417 event
== SNDRV_TIMER_EVENT_CONTINUE
)
418 resolution
= snd_timer_resolution(ti
);
420 ti
->ccallback(ti
, event
, &tstamp
, resolution
);
421 if (ti
->flags
& SNDRV_TIMER_IFLG_SLAVE
)
426 if (timer
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)
428 list_for_each_entry(ts
, &ti
->slave_active_head
, active_list
)
430 ts
->ccallback(ts
, event
+ 100, &tstamp
, resolution
);
433 /* start/continue a master timer */
434 static int snd_timer_start1(struct snd_timer_instance
*timeri
,
435 bool start
, unsigned long ticks
)
437 struct snd_timer
*timer
;
441 timer
= timeri
->timer
;
445 spin_lock_irqsave(&timer
->lock
, flags
);
446 if (timer
->card
&& timer
->card
->shutdown
) {
450 if (timeri
->flags
& (SNDRV_TIMER_IFLG_RUNNING
|
451 SNDRV_TIMER_IFLG_START
)) {
457 timeri
->ticks
= timeri
->cticks
= ticks
;
458 else if (!timeri
->cticks
)
462 list_move_tail(&timeri
->active_list
, &timer
->active_list_head
);
463 if (timer
->running
) {
464 if (timer
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)
466 timer
->flags
|= SNDRV_TIMER_FLG_RESCHED
;
467 timeri
->flags
|= SNDRV_TIMER_IFLG_START
;
468 result
= 1; /* delayed start */
471 timer
->sticks
= ticks
;
472 timer
->hw
.start(timer
);
475 timeri
->flags
|= SNDRV_TIMER_IFLG_RUNNING
;
478 snd_timer_notify1(timeri
, start
? SNDRV_TIMER_EVENT_START
:
479 SNDRV_TIMER_EVENT_CONTINUE
);
481 spin_unlock_irqrestore(&timer
->lock
, flags
);
485 /* start/continue a slave timer */
486 static int snd_timer_start_slave(struct snd_timer_instance
*timeri
,
491 spin_lock_irqsave(&slave_active_lock
, flags
);
492 if (timeri
->flags
& SNDRV_TIMER_IFLG_RUNNING
) {
493 spin_unlock_irqrestore(&slave_active_lock
, flags
);
496 timeri
->flags
|= SNDRV_TIMER_IFLG_RUNNING
;
497 if (timeri
->master
&& timeri
->timer
) {
498 spin_lock(&timeri
->timer
->lock
);
499 list_add_tail(&timeri
->active_list
,
500 &timeri
->master
->slave_active_head
);
501 snd_timer_notify1(timeri
, start
? SNDRV_TIMER_EVENT_START
:
502 SNDRV_TIMER_EVENT_CONTINUE
);
503 spin_unlock(&timeri
->timer
->lock
);
505 spin_unlock_irqrestore(&slave_active_lock
, flags
);
506 return 1; /* delayed start */
509 /* stop/pause a master timer */
510 static int snd_timer_stop1(struct snd_timer_instance
*timeri
, bool stop
)
512 struct snd_timer
*timer
;
516 timer
= timeri
->timer
;
519 spin_lock_irqsave(&timer
->lock
, flags
);
520 if (!(timeri
->flags
& (SNDRV_TIMER_IFLG_RUNNING
|
521 SNDRV_TIMER_IFLG_START
))) {
525 list_del_init(&timeri
->ack_list
);
526 list_del_init(&timeri
->active_list
);
527 if (timer
->card
&& timer
->card
->shutdown
)
530 timeri
->cticks
= timeri
->ticks
;
533 if ((timeri
->flags
& SNDRV_TIMER_IFLG_RUNNING
) &&
534 !(--timer
->running
)) {
535 timer
->hw
.stop(timer
);
536 if (timer
->flags
& SNDRV_TIMER_FLG_RESCHED
) {
537 timer
->flags
&= ~SNDRV_TIMER_FLG_RESCHED
;
538 snd_timer_reschedule(timer
, 0);
539 if (timer
->flags
& SNDRV_TIMER_FLG_CHANGE
) {
540 timer
->flags
&= ~SNDRV_TIMER_FLG_CHANGE
;
541 timer
->hw
.start(timer
);
545 timeri
->flags
&= ~(SNDRV_TIMER_IFLG_RUNNING
| SNDRV_TIMER_IFLG_START
);
547 timeri
->flags
&= ~SNDRV_TIMER_IFLG_PAUSED
;
549 timeri
->flags
|= SNDRV_TIMER_IFLG_PAUSED
;
550 snd_timer_notify1(timeri
, stop
? SNDRV_TIMER_EVENT_STOP
:
551 SNDRV_TIMER_EVENT_CONTINUE
);
553 spin_unlock_irqrestore(&timer
->lock
, flags
);
557 /* stop/pause a slave timer */
558 static int snd_timer_stop_slave(struct snd_timer_instance
*timeri
, bool stop
)
562 spin_lock_irqsave(&slave_active_lock
, flags
);
563 if (!(timeri
->flags
& SNDRV_TIMER_IFLG_RUNNING
)) {
564 spin_unlock_irqrestore(&slave_active_lock
, flags
);
567 timeri
->flags
&= ~SNDRV_TIMER_IFLG_RUNNING
;
569 spin_lock(&timeri
->timer
->lock
);
570 list_del_init(&timeri
->ack_list
);
571 list_del_init(&timeri
->active_list
);
572 snd_timer_notify1(timeri
, stop
? SNDRV_TIMER_EVENT_STOP
:
573 SNDRV_TIMER_EVENT_CONTINUE
);
574 spin_unlock(&timeri
->timer
->lock
);
576 spin_unlock_irqrestore(&slave_active_lock
, flags
);
581 * start the timer instance
583 int snd_timer_start(struct snd_timer_instance
*timeri
, unsigned int ticks
)
585 if (timeri
== NULL
|| ticks
< 1)
587 if (timeri
->flags
& SNDRV_TIMER_IFLG_SLAVE
)
588 return snd_timer_start_slave(timeri
, true);
590 return snd_timer_start1(timeri
, true, ticks
);
594 * stop the timer instance.
596 * do not call this from the timer callback!
598 int snd_timer_stop(struct snd_timer_instance
*timeri
)
600 if (timeri
->flags
& SNDRV_TIMER_IFLG_SLAVE
)
601 return snd_timer_stop_slave(timeri
, true);
603 return snd_timer_stop1(timeri
, true);
607 * start again.. the tick is kept.
609 int snd_timer_continue(struct snd_timer_instance
*timeri
)
611 /* timer can continue only after pause */
612 if (!(timeri
->flags
& SNDRV_TIMER_IFLG_PAUSED
))
615 if (timeri
->flags
& SNDRV_TIMER_IFLG_SLAVE
)
616 return snd_timer_start_slave(timeri
, false);
618 return snd_timer_start1(timeri
, false, 0);
622 * pause.. remember the ticks left
624 int snd_timer_pause(struct snd_timer_instance
* timeri
)
626 if (timeri
->flags
& SNDRV_TIMER_IFLG_SLAVE
)
627 return snd_timer_stop_slave(timeri
, false);
629 return snd_timer_stop1(timeri
, false);
633 * reschedule the timer
635 * start pending instances and check the scheduling ticks.
636 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
638 static void snd_timer_reschedule(struct snd_timer
* timer
, unsigned long ticks_left
)
640 struct snd_timer_instance
*ti
;
641 unsigned long ticks
= ~0UL;
643 list_for_each_entry(ti
, &timer
->active_list_head
, active_list
) {
644 if (ti
->flags
& SNDRV_TIMER_IFLG_START
) {
645 ti
->flags
&= ~SNDRV_TIMER_IFLG_START
;
646 ti
->flags
|= SNDRV_TIMER_IFLG_RUNNING
;
649 if (ti
->flags
& SNDRV_TIMER_IFLG_RUNNING
) {
650 if (ticks
> ti
->cticks
)
655 timer
->flags
&= ~SNDRV_TIMER_FLG_RESCHED
;
658 if (ticks
> timer
->hw
.ticks
)
659 ticks
= timer
->hw
.ticks
;
660 if (ticks_left
!= ticks
)
661 timer
->flags
|= SNDRV_TIMER_FLG_CHANGE
;
662 timer
->sticks
= ticks
;
669 static void snd_timer_tasklet(unsigned long arg
)
671 struct snd_timer
*timer
= (struct snd_timer
*) arg
;
672 struct snd_timer_instance
*ti
;
674 unsigned long resolution
, ticks
;
677 if (timer
->card
&& timer
->card
->shutdown
)
680 spin_lock_irqsave(&timer
->lock
, flags
);
681 /* now process all callbacks */
682 while (!list_empty(&timer
->sack_list_head
)) {
683 p
= timer
->sack_list_head
.next
; /* get first item */
684 ti
= list_entry(p
, struct snd_timer_instance
, ack_list
);
686 /* remove from ack_list and make empty */
691 resolution
= ti
->resolution
;
693 ti
->flags
|= SNDRV_TIMER_IFLG_CALLBACK
;
694 spin_unlock(&timer
->lock
);
696 ti
->callback(ti
, resolution
, ticks
);
697 spin_lock(&timer
->lock
);
698 ti
->flags
&= ~SNDRV_TIMER_IFLG_CALLBACK
;
700 spin_unlock_irqrestore(&timer
->lock
, flags
);
706 * ticks_left is usually equal to timer->sticks.
709 void snd_timer_interrupt(struct snd_timer
* timer
, unsigned long ticks_left
)
711 struct snd_timer_instance
*ti
, *ts
, *tmp
;
712 unsigned long resolution
, ticks
;
713 struct list_head
*p
, *ack_list_head
;
720 if (timer
->card
&& timer
->card
->shutdown
)
723 spin_lock_irqsave(&timer
->lock
, flags
);
725 /* remember the current resolution */
726 if (timer
->hw
.c_resolution
)
727 resolution
= timer
->hw
.c_resolution(timer
);
729 resolution
= timer
->hw
.resolution
;
731 /* loop for all active instances
732 * Here we cannot use list_for_each_entry because the active_list of a
733 * processed instance is relinked to done_list_head before the callback
736 list_for_each_entry_safe(ti
, tmp
, &timer
->active_list_head
,
738 if (!(ti
->flags
& SNDRV_TIMER_IFLG_RUNNING
))
740 ti
->pticks
+= ticks_left
;
741 ti
->resolution
= resolution
;
742 if (ti
->cticks
< ticks_left
)
745 ti
->cticks
-= ticks_left
;
746 if (ti
->cticks
) /* not expired */
748 if (ti
->flags
& SNDRV_TIMER_IFLG_AUTO
) {
749 ti
->cticks
= ti
->ticks
;
751 ti
->flags
&= ~SNDRV_TIMER_IFLG_RUNNING
;
753 list_del_init(&ti
->active_list
);
755 if ((timer
->hw
.flags
& SNDRV_TIMER_HW_TASKLET
) ||
756 (ti
->flags
& SNDRV_TIMER_IFLG_FAST
))
757 ack_list_head
= &timer
->ack_list_head
;
759 ack_list_head
= &timer
->sack_list_head
;
760 if (list_empty(&ti
->ack_list
))
761 list_add_tail(&ti
->ack_list
, ack_list_head
);
762 list_for_each_entry(ts
, &ti
->slave_active_head
, active_list
) {
763 ts
->pticks
= ti
->pticks
;
764 ts
->resolution
= resolution
;
765 if (list_empty(&ts
->ack_list
))
766 list_add_tail(&ts
->ack_list
, ack_list_head
);
769 if (timer
->flags
& SNDRV_TIMER_FLG_RESCHED
)
770 snd_timer_reschedule(timer
, timer
->sticks
);
771 if (timer
->running
) {
772 if (timer
->hw
.flags
& SNDRV_TIMER_HW_STOP
) {
773 timer
->hw
.stop(timer
);
774 timer
->flags
|= SNDRV_TIMER_FLG_CHANGE
;
776 if (!(timer
->hw
.flags
& SNDRV_TIMER_HW_AUTO
) ||
777 (timer
->flags
& SNDRV_TIMER_FLG_CHANGE
)) {
779 timer
->flags
&= ~SNDRV_TIMER_FLG_CHANGE
;
780 timer
->hw
.start(timer
);
783 timer
->hw
.stop(timer
);
786 /* now process all fast callbacks */
787 while (!list_empty(&timer
->ack_list_head
)) {
788 p
= timer
->ack_list_head
.next
; /* get first item */
789 ti
= list_entry(p
, struct snd_timer_instance
, ack_list
);
791 /* remove from ack_list and make empty */
797 ti
->flags
|= SNDRV_TIMER_IFLG_CALLBACK
;
798 spin_unlock(&timer
->lock
);
800 ti
->callback(ti
, resolution
, ticks
);
801 spin_lock(&timer
->lock
);
802 ti
->flags
&= ~SNDRV_TIMER_IFLG_CALLBACK
;
805 /* do we have any slow callbacks? */
806 use_tasklet
= !list_empty(&timer
->sack_list_head
);
807 spin_unlock_irqrestore(&timer
->lock
, flags
);
810 tasklet_schedule(&timer
->task_queue
);
817 int snd_timer_new(struct snd_card
*card
, char *id
, struct snd_timer_id
*tid
,
818 struct snd_timer
**rtimer
)
820 struct snd_timer
*timer
;
822 static struct snd_device_ops ops
= {
823 .dev_free
= snd_timer_dev_free
,
824 .dev_register
= snd_timer_dev_register
,
825 .dev_disconnect
= snd_timer_dev_disconnect
,
828 if (snd_BUG_ON(!tid
))
832 timer
= kzalloc(sizeof(*timer
), GFP_KERNEL
);
835 timer
->tmr_class
= tid
->dev_class
;
837 timer
->tmr_device
= tid
->device
;
838 timer
->tmr_subdevice
= tid
->subdevice
;
840 strlcpy(timer
->id
, id
, sizeof(timer
->id
));
842 INIT_LIST_HEAD(&timer
->device_list
);
843 INIT_LIST_HEAD(&timer
->open_list_head
);
844 INIT_LIST_HEAD(&timer
->active_list_head
);
845 INIT_LIST_HEAD(&timer
->ack_list_head
);
846 INIT_LIST_HEAD(&timer
->sack_list_head
);
847 spin_lock_init(&timer
->lock
);
848 tasklet_init(&timer
->task_queue
, snd_timer_tasklet
,
849 (unsigned long)timer
);
851 timer
->module
= card
->module
;
852 err
= snd_device_new(card
, SNDRV_DEV_TIMER
, timer
, &ops
);
854 snd_timer_free(timer
);
863 static int snd_timer_free(struct snd_timer
*timer
)
868 mutex_lock(®ister_mutex
);
869 if (! list_empty(&timer
->open_list_head
)) {
870 struct list_head
*p
, *n
;
871 struct snd_timer_instance
*ti
;
872 pr_warn("ALSA: timer %p is busy?\n", timer
);
873 list_for_each_safe(p
, n
, &timer
->open_list_head
) {
875 ti
= list_entry(p
, struct snd_timer_instance
, open_list
);
879 list_del(&timer
->device_list
);
880 mutex_unlock(®ister_mutex
);
882 if (timer
->private_free
)
883 timer
->private_free(timer
);
888 static int snd_timer_dev_free(struct snd_device
*device
)
890 struct snd_timer
*timer
= device
->device_data
;
891 return snd_timer_free(timer
);
894 static int snd_timer_dev_register(struct snd_device
*dev
)
896 struct snd_timer
*timer
= dev
->device_data
;
897 struct snd_timer
*timer1
;
899 if (snd_BUG_ON(!timer
|| !timer
->hw
.start
|| !timer
->hw
.stop
))
901 if (!(timer
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
) &&
902 !timer
->hw
.resolution
&& timer
->hw
.c_resolution
== NULL
)
905 mutex_lock(®ister_mutex
);
906 list_for_each_entry(timer1
, &snd_timer_list
, device_list
) {
907 if (timer1
->tmr_class
> timer
->tmr_class
)
909 if (timer1
->tmr_class
< timer
->tmr_class
)
911 if (timer1
->card
&& timer
->card
) {
912 if (timer1
->card
->number
> timer
->card
->number
)
914 if (timer1
->card
->number
< timer
->card
->number
)
917 if (timer1
->tmr_device
> timer
->tmr_device
)
919 if (timer1
->tmr_device
< timer
->tmr_device
)
921 if (timer1
->tmr_subdevice
> timer
->tmr_subdevice
)
923 if (timer1
->tmr_subdevice
< timer
->tmr_subdevice
)
926 mutex_unlock(®ister_mutex
);
929 list_add_tail(&timer
->device_list
, &timer1
->device_list
);
930 mutex_unlock(®ister_mutex
);
934 static int snd_timer_dev_disconnect(struct snd_device
*device
)
936 struct snd_timer
*timer
= device
->device_data
;
937 struct snd_timer_instance
*ti
;
939 mutex_lock(®ister_mutex
);
940 list_del_init(&timer
->device_list
);
941 /* wake up pending sleepers */
942 list_for_each_entry(ti
, &timer
->open_list_head
, open_list
) {
946 mutex_unlock(®ister_mutex
);
950 void snd_timer_notify(struct snd_timer
*timer
, int event
, struct timespec
*tstamp
)
953 unsigned long resolution
= 0;
954 struct snd_timer_instance
*ti
, *ts
;
956 if (timer
->card
&& timer
->card
->shutdown
)
958 if (! (timer
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
))
960 if (snd_BUG_ON(event
< SNDRV_TIMER_EVENT_MSTART
||
961 event
> SNDRV_TIMER_EVENT_MRESUME
))
963 spin_lock_irqsave(&timer
->lock
, flags
);
964 if (event
== SNDRV_TIMER_EVENT_MSTART
||
965 event
== SNDRV_TIMER_EVENT_MCONTINUE
||
966 event
== SNDRV_TIMER_EVENT_MRESUME
) {
967 if (timer
->hw
.c_resolution
)
968 resolution
= timer
->hw
.c_resolution(timer
);
970 resolution
= timer
->hw
.resolution
;
972 list_for_each_entry(ti
, &timer
->active_list_head
, active_list
) {
974 ti
->ccallback(ti
, event
, tstamp
, resolution
);
975 list_for_each_entry(ts
, &ti
->slave_active_head
, active_list
)
977 ts
->ccallback(ts
, event
, tstamp
, resolution
);
979 spin_unlock_irqrestore(&timer
->lock
, flags
);
983 * exported functions for global timers
985 int snd_timer_global_new(char *id
, int device
, struct snd_timer
**rtimer
)
987 struct snd_timer_id tid
;
989 tid
.dev_class
= SNDRV_TIMER_CLASS_GLOBAL
;
990 tid
.dev_sclass
= SNDRV_TIMER_SCLASS_NONE
;
994 return snd_timer_new(NULL
, id
, &tid
, rtimer
);
997 int snd_timer_global_free(struct snd_timer
*timer
)
999 return snd_timer_free(timer
);
1002 int snd_timer_global_register(struct snd_timer
*timer
)
1004 struct snd_device dev
;
1006 memset(&dev
, 0, sizeof(dev
));
1007 dev
.device_data
= timer
;
1008 return snd_timer_dev_register(&dev
);
1015 struct snd_timer_system_private
{
1016 struct timer_list tlist
;
1017 unsigned long last_expires
;
1018 unsigned long last_jiffies
;
1019 unsigned long correction
;
1022 static void snd_timer_s_function(unsigned long data
)
1024 struct snd_timer
*timer
= (struct snd_timer
*)data
;
1025 struct snd_timer_system_private
*priv
= timer
->private_data
;
1026 unsigned long jiff
= jiffies
;
1027 if (time_after(jiff
, priv
->last_expires
))
1028 priv
->correction
+= (long)jiff
- (long)priv
->last_expires
;
1029 snd_timer_interrupt(timer
, (long)jiff
- (long)priv
->last_jiffies
);
1032 static int snd_timer_s_start(struct snd_timer
* timer
)
1034 struct snd_timer_system_private
*priv
;
1035 unsigned long njiff
;
1037 priv
= (struct snd_timer_system_private
*) timer
->private_data
;
1038 njiff
= (priv
->last_jiffies
= jiffies
);
1039 if (priv
->correction
> timer
->sticks
- 1) {
1040 priv
->correction
-= timer
->sticks
- 1;
1043 njiff
+= timer
->sticks
- priv
->correction
;
1044 priv
->correction
= 0;
1046 priv
->last_expires
= njiff
;
1047 mod_timer(&priv
->tlist
, njiff
);
1051 static int snd_timer_s_stop(struct snd_timer
* timer
)
1053 struct snd_timer_system_private
*priv
;
1056 priv
= (struct snd_timer_system_private
*) timer
->private_data
;
1057 del_timer(&priv
->tlist
);
1059 if (time_before(jiff
, priv
->last_expires
))
1060 timer
->sticks
= priv
->last_expires
- jiff
;
1063 priv
->correction
= 0;
1067 static int snd_timer_s_close(struct snd_timer
*timer
)
1069 struct snd_timer_system_private
*priv
;
1071 priv
= (struct snd_timer_system_private
*)timer
->private_data
;
1072 del_timer_sync(&priv
->tlist
);
1076 static struct snd_timer_hardware snd_timer_system
=
1078 .flags
= SNDRV_TIMER_HW_FIRST
| SNDRV_TIMER_HW_TASKLET
,
1079 .resolution
= 1000000000L / HZ
,
1081 .close
= snd_timer_s_close
,
1082 .start
= snd_timer_s_start
,
1083 .stop
= snd_timer_s_stop
1086 static void snd_timer_free_system(struct snd_timer
*timer
)
1088 kfree(timer
->private_data
);
1091 static int snd_timer_register_system(void)
1093 struct snd_timer
*timer
;
1094 struct snd_timer_system_private
*priv
;
1097 err
= snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM
, &timer
);
1100 strcpy(timer
->name
, "system timer");
1101 timer
->hw
= snd_timer_system
;
1102 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
1104 snd_timer_free(timer
);
1107 setup_timer(&priv
->tlist
, snd_timer_s_function
, (unsigned long) timer
);
1108 timer
->private_data
= priv
;
1109 timer
->private_free
= snd_timer_free_system
;
1110 return snd_timer_global_register(timer
);
1113 #ifdef CONFIG_SND_PROC_FS
1118 static void snd_timer_proc_read(struct snd_info_entry
*entry
,
1119 struct snd_info_buffer
*buffer
)
1121 struct snd_timer
*timer
;
1122 struct snd_timer_instance
*ti
;
1124 mutex_lock(®ister_mutex
);
1125 list_for_each_entry(timer
, &snd_timer_list
, device_list
) {
1126 if (timer
->card
&& timer
->card
->shutdown
)
1128 switch (timer
->tmr_class
) {
1129 case SNDRV_TIMER_CLASS_GLOBAL
:
1130 snd_iprintf(buffer
, "G%i: ", timer
->tmr_device
);
1132 case SNDRV_TIMER_CLASS_CARD
:
1133 snd_iprintf(buffer
, "C%i-%i: ",
1134 timer
->card
->number
, timer
->tmr_device
);
1136 case SNDRV_TIMER_CLASS_PCM
:
1137 snd_iprintf(buffer
, "P%i-%i-%i: ", timer
->card
->number
,
1138 timer
->tmr_device
, timer
->tmr_subdevice
);
1141 snd_iprintf(buffer
, "?%i-%i-%i-%i: ", timer
->tmr_class
,
1142 timer
->card
? timer
->card
->number
: -1,
1143 timer
->tmr_device
, timer
->tmr_subdevice
);
1145 snd_iprintf(buffer
, "%s :", timer
->name
);
1146 if (timer
->hw
.resolution
)
1147 snd_iprintf(buffer
, " %lu.%03luus (%lu ticks)",
1148 timer
->hw
.resolution
/ 1000,
1149 timer
->hw
.resolution
% 1000,
1151 if (timer
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)
1152 snd_iprintf(buffer
, " SLAVE");
1153 snd_iprintf(buffer
, "\n");
1154 list_for_each_entry(ti
, &timer
->open_list_head
, open_list
)
1155 snd_iprintf(buffer
, " Client %s : %s\n",
1156 ti
->owner
? ti
->owner
: "unknown",
1157 ti
->flags
& (SNDRV_TIMER_IFLG_START
|
1158 SNDRV_TIMER_IFLG_RUNNING
)
1159 ? "running" : "stopped");
1161 mutex_unlock(®ister_mutex
);
1164 static struct snd_info_entry
*snd_timer_proc_entry
;
1166 static void __init
snd_timer_proc_init(void)
1168 struct snd_info_entry
*entry
;
1170 entry
= snd_info_create_module_entry(THIS_MODULE
, "timers", NULL
);
1171 if (entry
!= NULL
) {
1172 entry
->c
.text
.read
= snd_timer_proc_read
;
1173 if (snd_info_register(entry
) < 0) {
1174 snd_info_free_entry(entry
);
1178 snd_timer_proc_entry
= entry
;
1181 static void __exit
snd_timer_proc_done(void)
1183 snd_info_free_entry(snd_timer_proc_entry
);
1185 #else /* !CONFIG_SND_PROC_FS */
1186 #define snd_timer_proc_init()
1187 #define snd_timer_proc_done()
1191 * USER SPACE interface
1194 static void snd_timer_user_interrupt(struct snd_timer_instance
*timeri
,
1195 unsigned long resolution
,
1196 unsigned long ticks
)
1198 struct snd_timer_user
*tu
= timeri
->callback_data
;
1199 struct snd_timer_read
*r
;
1202 spin_lock(&tu
->qlock
);
1203 if (tu
->qused
> 0) {
1204 prev
= tu
->qtail
== 0 ? tu
->queue_size
- 1 : tu
->qtail
- 1;
1205 r
= &tu
->queue
[prev
];
1206 if (r
->resolution
== resolution
) {
1211 if (tu
->qused
>= tu
->queue_size
) {
1214 r
= &tu
->queue
[tu
->qtail
++];
1215 tu
->qtail
%= tu
->queue_size
;
1216 r
->resolution
= resolution
;
1221 spin_unlock(&tu
->qlock
);
1222 kill_fasync(&tu
->fasync
, SIGIO
, POLL_IN
);
1223 wake_up(&tu
->qchange_sleep
);
1226 static void snd_timer_user_append_to_tqueue(struct snd_timer_user
*tu
,
1227 struct snd_timer_tread
*tread
)
1229 if (tu
->qused
>= tu
->queue_size
) {
1232 memcpy(&tu
->tqueue
[tu
->qtail
++], tread
, sizeof(*tread
));
1233 tu
->qtail
%= tu
->queue_size
;
1238 static void snd_timer_user_ccallback(struct snd_timer_instance
*timeri
,
1240 struct timespec
*tstamp
,
1241 unsigned long resolution
)
1243 struct snd_timer_user
*tu
= timeri
->callback_data
;
1244 struct snd_timer_tread r1
;
1245 unsigned long flags
;
1247 if (event
>= SNDRV_TIMER_EVENT_START
&&
1248 event
<= SNDRV_TIMER_EVENT_PAUSE
)
1249 tu
->tstamp
= *tstamp
;
1250 if ((tu
->filter
& (1 << event
)) == 0 || !tu
->tread
)
1252 memset(&r1
, 0, sizeof(r1
));
1254 r1
.tstamp
= *tstamp
;
1255 r1
.val
= resolution
;
1256 spin_lock_irqsave(&tu
->qlock
, flags
);
1257 snd_timer_user_append_to_tqueue(tu
, &r1
);
1258 spin_unlock_irqrestore(&tu
->qlock
, flags
);
1259 kill_fasync(&tu
->fasync
, SIGIO
, POLL_IN
);
1260 wake_up(&tu
->qchange_sleep
);
1263 static void snd_timer_user_disconnect(struct snd_timer_instance
*timeri
)
1265 struct snd_timer_user
*tu
= timeri
->callback_data
;
1267 tu
->disconnected
= true;
1268 wake_up(&tu
->qchange_sleep
);
1271 static void snd_timer_user_tinterrupt(struct snd_timer_instance
*timeri
,
1272 unsigned long resolution
,
1273 unsigned long ticks
)
1275 struct snd_timer_user
*tu
= timeri
->callback_data
;
1276 struct snd_timer_tread
*r
, r1
;
1277 struct timespec tstamp
;
1278 int prev
, append
= 0;
1280 memset(&r1
, 0, sizeof(r1
));
1281 memset(&tstamp
, 0, sizeof(tstamp
));
1282 spin_lock(&tu
->qlock
);
1283 if ((tu
->filter
& ((1 << SNDRV_TIMER_EVENT_RESOLUTION
) |
1284 (1 << SNDRV_TIMER_EVENT_TICK
))) == 0) {
1285 spin_unlock(&tu
->qlock
);
1288 if (tu
->last_resolution
!= resolution
|| ticks
> 0) {
1289 if (timer_tstamp_monotonic
)
1290 ktime_get_ts(&tstamp
);
1292 getnstimeofday(&tstamp
);
1294 if ((tu
->filter
& (1 << SNDRV_TIMER_EVENT_RESOLUTION
)) &&
1295 tu
->last_resolution
!= resolution
) {
1296 r1
.event
= SNDRV_TIMER_EVENT_RESOLUTION
;
1298 r1
.val
= resolution
;
1299 snd_timer_user_append_to_tqueue(tu
, &r1
);
1300 tu
->last_resolution
= resolution
;
1303 if ((tu
->filter
& (1 << SNDRV_TIMER_EVENT_TICK
)) == 0)
1307 if (tu
->qused
> 0) {
1308 prev
= tu
->qtail
== 0 ? tu
->queue_size
- 1 : tu
->qtail
- 1;
1309 r
= &tu
->tqueue
[prev
];
1310 if (r
->event
== SNDRV_TIMER_EVENT_TICK
) {
1317 r1
.event
= SNDRV_TIMER_EVENT_TICK
;
1320 snd_timer_user_append_to_tqueue(tu
, &r1
);
1323 spin_unlock(&tu
->qlock
);
1326 kill_fasync(&tu
->fasync
, SIGIO
, POLL_IN
);
1327 wake_up(&tu
->qchange_sleep
);
1330 static int snd_timer_user_open(struct inode
*inode
, struct file
*file
)
1332 struct snd_timer_user
*tu
;
1335 err
= nonseekable_open(inode
, file
);
1339 tu
= kzalloc(sizeof(*tu
), GFP_KERNEL
);
1342 spin_lock_init(&tu
->qlock
);
1343 init_waitqueue_head(&tu
->qchange_sleep
);
1344 mutex_init(&tu
->ioctl_lock
);
1346 tu
->queue_size
= 128;
1347 tu
->queue
= kmalloc(tu
->queue_size
* sizeof(struct snd_timer_read
),
1349 if (tu
->queue
== NULL
) {
1353 file
->private_data
= tu
;
1357 static int snd_timer_user_release(struct inode
*inode
, struct file
*file
)
1359 struct snd_timer_user
*tu
;
1361 if (file
->private_data
) {
1362 tu
= file
->private_data
;
1363 file
->private_data
= NULL
;
1364 mutex_lock(&tu
->ioctl_lock
);
1366 snd_timer_close(tu
->timeri
);
1367 mutex_unlock(&tu
->ioctl_lock
);
1375 static void snd_timer_user_zero_id(struct snd_timer_id
*id
)
1377 id
->dev_class
= SNDRV_TIMER_CLASS_NONE
;
1378 id
->dev_sclass
= SNDRV_TIMER_SCLASS_NONE
;
1384 static void snd_timer_user_copy_id(struct snd_timer_id
*id
, struct snd_timer
*timer
)
1386 id
->dev_class
= timer
->tmr_class
;
1387 id
->dev_sclass
= SNDRV_TIMER_SCLASS_NONE
;
1388 id
->card
= timer
->card
? timer
->card
->number
: -1;
1389 id
->device
= timer
->tmr_device
;
1390 id
->subdevice
= timer
->tmr_subdevice
;
1393 static int snd_timer_user_next_device(struct snd_timer_id __user
*_tid
)
1395 struct snd_timer_id id
;
1396 struct snd_timer
*timer
;
1397 struct list_head
*p
;
1399 if (copy_from_user(&id
, _tid
, sizeof(id
)))
1401 mutex_lock(®ister_mutex
);
1402 if (id
.dev_class
< 0) { /* first item */
1403 if (list_empty(&snd_timer_list
))
1404 snd_timer_user_zero_id(&id
);
1406 timer
= list_entry(snd_timer_list
.next
,
1407 struct snd_timer
, device_list
);
1408 snd_timer_user_copy_id(&id
, timer
);
1411 switch (id
.dev_class
) {
1412 case SNDRV_TIMER_CLASS_GLOBAL
:
1413 id
.device
= id
.device
< 0 ? 0 : id
.device
+ 1;
1414 list_for_each(p
, &snd_timer_list
) {
1415 timer
= list_entry(p
, struct snd_timer
, device_list
);
1416 if (timer
->tmr_class
> SNDRV_TIMER_CLASS_GLOBAL
) {
1417 snd_timer_user_copy_id(&id
, timer
);
1420 if (timer
->tmr_device
>= id
.device
) {
1421 snd_timer_user_copy_id(&id
, timer
);
1425 if (p
== &snd_timer_list
)
1426 snd_timer_user_zero_id(&id
);
1428 case SNDRV_TIMER_CLASS_CARD
:
1429 case SNDRV_TIMER_CLASS_PCM
:
1433 if (id
.device
< 0) {
1436 if (id
.subdevice
< 0)
1442 list_for_each(p
, &snd_timer_list
) {
1443 timer
= list_entry(p
, struct snd_timer
, device_list
);
1444 if (timer
->tmr_class
> id
.dev_class
) {
1445 snd_timer_user_copy_id(&id
, timer
);
1448 if (timer
->tmr_class
< id
.dev_class
)
1450 if (timer
->card
->number
> id
.card
) {
1451 snd_timer_user_copy_id(&id
, timer
);
1454 if (timer
->card
->number
< id
.card
)
1456 if (timer
->tmr_device
> id
.device
) {
1457 snd_timer_user_copy_id(&id
, timer
);
1460 if (timer
->tmr_device
< id
.device
)
1462 if (timer
->tmr_subdevice
> id
.subdevice
) {
1463 snd_timer_user_copy_id(&id
, timer
);
1466 if (timer
->tmr_subdevice
< id
.subdevice
)
1468 snd_timer_user_copy_id(&id
, timer
);
1471 if (p
== &snd_timer_list
)
1472 snd_timer_user_zero_id(&id
);
1475 snd_timer_user_zero_id(&id
);
1478 mutex_unlock(®ister_mutex
);
1479 if (copy_to_user(_tid
, &id
, sizeof(*_tid
)))
1484 static int snd_timer_user_ginfo(struct file
*file
,
1485 struct snd_timer_ginfo __user
*_ginfo
)
1487 struct snd_timer_ginfo
*ginfo
;
1488 struct snd_timer_id tid
;
1489 struct snd_timer
*t
;
1490 struct list_head
*p
;
1493 ginfo
= memdup_user(_ginfo
, sizeof(*ginfo
));
1495 return PTR_ERR(ginfo
);
1498 memset(ginfo
, 0, sizeof(*ginfo
));
1500 mutex_lock(®ister_mutex
);
1501 t
= snd_timer_find(&tid
);
1503 ginfo
->card
= t
->card
? t
->card
->number
: -1;
1504 if (t
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)
1505 ginfo
->flags
|= SNDRV_TIMER_FLG_SLAVE
;
1506 strlcpy(ginfo
->id
, t
->id
, sizeof(ginfo
->id
));
1507 strlcpy(ginfo
->name
, t
->name
, sizeof(ginfo
->name
));
1508 ginfo
->resolution
= t
->hw
.resolution
;
1509 if (t
->hw
.resolution_min
> 0) {
1510 ginfo
->resolution_min
= t
->hw
.resolution_min
;
1511 ginfo
->resolution_max
= t
->hw
.resolution_max
;
1513 list_for_each(p
, &t
->open_list_head
) {
1519 mutex_unlock(®ister_mutex
);
1520 if (err
>= 0 && copy_to_user(_ginfo
, ginfo
, sizeof(*ginfo
)))
1526 static int timer_set_gparams(struct snd_timer_gparams
*gparams
)
1528 struct snd_timer
*t
;
1531 mutex_lock(®ister_mutex
);
1532 t
= snd_timer_find(&gparams
->tid
);
1537 if (!list_empty(&t
->open_list_head
)) {
1541 if (!t
->hw
.set_period
) {
1545 err
= t
->hw
.set_period(t
, gparams
->period_num
, gparams
->period_den
);
1547 mutex_unlock(®ister_mutex
);
1551 static int snd_timer_user_gparams(struct file
*file
,
1552 struct snd_timer_gparams __user
*_gparams
)
1554 struct snd_timer_gparams gparams
;
1556 if (copy_from_user(&gparams
, _gparams
, sizeof(gparams
)))
1558 return timer_set_gparams(&gparams
);
1561 static int snd_timer_user_gstatus(struct file
*file
,
1562 struct snd_timer_gstatus __user
*_gstatus
)
1564 struct snd_timer_gstatus gstatus
;
1565 struct snd_timer_id tid
;
1566 struct snd_timer
*t
;
1569 if (copy_from_user(&gstatus
, _gstatus
, sizeof(gstatus
)))
1572 memset(&gstatus
, 0, sizeof(gstatus
));
1574 mutex_lock(®ister_mutex
);
1575 t
= snd_timer_find(&tid
);
1577 if (t
->hw
.c_resolution
)
1578 gstatus
.resolution
= t
->hw
.c_resolution(t
);
1580 gstatus
.resolution
= t
->hw
.resolution
;
1581 if (t
->hw
.precise_resolution
) {
1582 t
->hw
.precise_resolution(t
, &gstatus
.resolution_num
,
1583 &gstatus
.resolution_den
);
1585 gstatus
.resolution_num
= gstatus
.resolution
;
1586 gstatus
.resolution_den
= 1000000000uL;
1591 mutex_unlock(®ister_mutex
);
1592 if (err
>= 0 && copy_to_user(_gstatus
, &gstatus
, sizeof(gstatus
)))
1597 static int snd_timer_user_tselect(struct file
*file
,
1598 struct snd_timer_select __user
*_tselect
)
1600 struct snd_timer_user
*tu
;
1601 struct snd_timer_select tselect
;
1605 tu
= file
->private_data
;
1607 snd_timer_close(tu
->timeri
);
1610 if (copy_from_user(&tselect
, _tselect
, sizeof(tselect
))) {
1614 sprintf(str
, "application %i", current
->pid
);
1615 if (tselect
.id
.dev_class
!= SNDRV_TIMER_CLASS_SLAVE
)
1616 tselect
.id
.dev_sclass
= SNDRV_TIMER_SCLASS_APPLICATION
;
1617 err
= snd_timer_open(&tu
->timeri
, str
, &tselect
.id
, current
->pid
);
1626 tu
->tqueue
= kmalloc(tu
->queue_size
* sizeof(struct snd_timer_tread
),
1628 if (tu
->tqueue
== NULL
)
1631 tu
->queue
= kmalloc(tu
->queue_size
* sizeof(struct snd_timer_read
),
1633 if (tu
->queue
== NULL
)
1638 snd_timer_close(tu
->timeri
);
1641 tu
->timeri
->flags
|= SNDRV_TIMER_IFLG_FAST
;
1642 tu
->timeri
->callback
= tu
->tread
1643 ? snd_timer_user_tinterrupt
: snd_timer_user_interrupt
;
1644 tu
->timeri
->ccallback
= snd_timer_user_ccallback
;
1645 tu
->timeri
->callback_data
= (void *)tu
;
1646 tu
->timeri
->disconnect
= snd_timer_user_disconnect
;
1653 static int snd_timer_user_info(struct file
*file
,
1654 struct snd_timer_info __user
*_info
)
1656 struct snd_timer_user
*tu
;
1657 struct snd_timer_info
*info
;
1658 struct snd_timer
*t
;
1661 tu
= file
->private_data
;
1664 t
= tu
->timeri
->timer
;
1668 info
= kzalloc(sizeof(*info
), GFP_KERNEL
);
1671 info
->card
= t
->card
? t
->card
->number
: -1;
1672 if (t
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)
1673 info
->flags
|= SNDRV_TIMER_FLG_SLAVE
;
1674 strlcpy(info
->id
, t
->id
, sizeof(info
->id
));
1675 strlcpy(info
->name
, t
->name
, sizeof(info
->name
));
1676 info
->resolution
= t
->hw
.resolution
;
1677 if (copy_to_user(_info
, info
, sizeof(*_info
)))
1683 static int snd_timer_user_params(struct file
*file
,
1684 struct snd_timer_params __user
*_params
)
1686 struct snd_timer_user
*tu
;
1687 struct snd_timer_params params
;
1688 struct snd_timer
*t
;
1689 struct snd_timer_read
*tr
;
1690 struct snd_timer_tread
*ttr
;
1693 tu
= file
->private_data
;
1696 t
= tu
->timeri
->timer
;
1699 if (copy_from_user(¶ms
, _params
, sizeof(params
)))
1701 if (!(t
->hw
.flags
& SNDRV_TIMER_HW_SLAVE
)) {
1704 if (params
.ticks
< 1) {
1709 /* Don't allow resolution less than 1ms */
1710 resolution
= snd_timer_resolution(tu
->timeri
);
1711 resolution
*= params
.ticks
;
1712 if (resolution
< 1000000) {
1717 if (params
.queue_size
> 0 &&
1718 (params
.queue_size
< 32 || params
.queue_size
> 1024)) {
1722 if (params
.filter
& ~((1<<SNDRV_TIMER_EVENT_RESOLUTION
)|
1723 (1<<SNDRV_TIMER_EVENT_TICK
)|
1724 (1<<SNDRV_TIMER_EVENT_START
)|
1725 (1<<SNDRV_TIMER_EVENT_STOP
)|
1726 (1<<SNDRV_TIMER_EVENT_CONTINUE
)|
1727 (1<<SNDRV_TIMER_EVENT_PAUSE
)|
1728 (1<<SNDRV_TIMER_EVENT_SUSPEND
)|
1729 (1<<SNDRV_TIMER_EVENT_RESUME
)|
1730 (1<<SNDRV_TIMER_EVENT_MSTART
)|
1731 (1<<SNDRV_TIMER_EVENT_MSTOP
)|
1732 (1<<SNDRV_TIMER_EVENT_MCONTINUE
)|
1733 (1<<SNDRV_TIMER_EVENT_MPAUSE
)|
1734 (1<<SNDRV_TIMER_EVENT_MSUSPEND
)|
1735 (1<<SNDRV_TIMER_EVENT_MRESUME
))) {
1739 snd_timer_stop(tu
->timeri
);
1740 spin_lock_irq(&t
->lock
);
1741 tu
->timeri
->flags
&= ~(SNDRV_TIMER_IFLG_AUTO
|
1742 SNDRV_TIMER_IFLG_EXCLUSIVE
|
1743 SNDRV_TIMER_IFLG_EARLY_EVENT
);
1744 if (params
.flags
& SNDRV_TIMER_PSFLG_AUTO
)
1745 tu
->timeri
->flags
|= SNDRV_TIMER_IFLG_AUTO
;
1746 if (params
.flags
& SNDRV_TIMER_PSFLG_EXCLUSIVE
)
1747 tu
->timeri
->flags
|= SNDRV_TIMER_IFLG_EXCLUSIVE
;
1748 if (params
.flags
& SNDRV_TIMER_PSFLG_EARLY_EVENT
)
1749 tu
->timeri
->flags
|= SNDRV_TIMER_IFLG_EARLY_EVENT
;
1750 spin_unlock_irq(&t
->lock
);
1751 if (params
.queue_size
> 0 &&
1752 (unsigned int)tu
->queue_size
!= params
.queue_size
) {
1754 ttr
= kmalloc(params
.queue_size
* sizeof(*ttr
),
1758 tu
->queue_size
= params
.queue_size
;
1762 tr
= kmalloc(params
.queue_size
* sizeof(*tr
),
1766 tu
->queue_size
= params
.queue_size
;
1771 tu
->qhead
= tu
->qtail
= tu
->qused
= 0;
1772 if (tu
->timeri
->flags
& SNDRV_TIMER_IFLG_EARLY_EVENT
) {
1774 struct snd_timer_tread tread
;
1775 memset(&tread
, 0, sizeof(tread
));
1776 tread
.event
= SNDRV_TIMER_EVENT_EARLY
;
1777 tread
.tstamp
.tv_sec
= 0;
1778 tread
.tstamp
.tv_nsec
= 0;
1780 snd_timer_user_append_to_tqueue(tu
, &tread
);
1782 struct snd_timer_read
*r
= &tu
->queue
[0];
1789 tu
->filter
= params
.filter
;
1790 tu
->ticks
= params
.ticks
;
1793 if (copy_to_user(_params
, ¶ms
, sizeof(params
)))
1798 static int snd_timer_user_status(struct file
*file
,
1799 struct snd_timer_status __user
*_status
)
1801 struct snd_timer_user
*tu
;
1802 struct snd_timer_status status
;
1804 tu
= file
->private_data
;
1807 memset(&status
, 0, sizeof(status
));
1808 status
.tstamp
= tu
->tstamp
;
1809 status
.resolution
= snd_timer_resolution(tu
->timeri
);
1810 status
.lost
= tu
->timeri
->lost
;
1811 status
.overrun
= tu
->overrun
;
1812 spin_lock_irq(&tu
->qlock
);
1813 status
.queue
= tu
->qused
;
1814 spin_unlock_irq(&tu
->qlock
);
1815 if (copy_to_user(_status
, &status
, sizeof(status
)))
1820 static int snd_timer_user_start(struct file
*file
)
1823 struct snd_timer_user
*tu
;
1825 tu
= file
->private_data
;
1828 snd_timer_stop(tu
->timeri
);
1829 tu
->timeri
->lost
= 0;
1830 tu
->last_resolution
= 0;
1831 return (err
= snd_timer_start(tu
->timeri
, tu
->ticks
)) < 0 ? err
: 0;
1834 static int snd_timer_user_stop(struct file
*file
)
1837 struct snd_timer_user
*tu
;
1839 tu
= file
->private_data
;
1842 return (err
= snd_timer_stop(tu
->timeri
)) < 0 ? err
: 0;
1845 static int snd_timer_user_continue(struct file
*file
)
1848 struct snd_timer_user
*tu
;
1850 tu
= file
->private_data
;
1853 /* start timer instead of continue if it's not used before */
1854 if (!(tu
->timeri
->flags
& SNDRV_TIMER_IFLG_PAUSED
))
1855 return snd_timer_user_start(file
);
1856 tu
->timeri
->lost
= 0;
1857 return (err
= snd_timer_continue(tu
->timeri
)) < 0 ? err
: 0;
1860 static int snd_timer_user_pause(struct file
*file
)
1863 struct snd_timer_user
*tu
;
1865 tu
= file
->private_data
;
1868 return (err
= snd_timer_pause(tu
->timeri
)) < 0 ? err
: 0;
1872 SNDRV_TIMER_IOCTL_START_OLD
= _IO('T', 0x20),
1873 SNDRV_TIMER_IOCTL_STOP_OLD
= _IO('T', 0x21),
1874 SNDRV_TIMER_IOCTL_CONTINUE_OLD
= _IO('T', 0x22),
1875 SNDRV_TIMER_IOCTL_PAUSE_OLD
= _IO('T', 0x23),
1878 static long __snd_timer_user_ioctl(struct file
*file
, unsigned int cmd
,
1881 struct snd_timer_user
*tu
;
1882 void __user
*argp
= (void __user
*)arg
;
1883 int __user
*p
= argp
;
1885 tu
= file
->private_data
;
1887 case SNDRV_TIMER_IOCTL_PVERSION
:
1888 return put_user(SNDRV_TIMER_VERSION
, p
) ? -EFAULT
: 0;
1889 case SNDRV_TIMER_IOCTL_NEXT_DEVICE
:
1890 return snd_timer_user_next_device(argp
);
1891 case SNDRV_TIMER_IOCTL_TREAD
:
1895 if (tu
->timeri
) /* too late */
1897 if (get_user(xarg
, p
))
1899 tu
->tread
= xarg
? 1 : 0;
1902 case SNDRV_TIMER_IOCTL_GINFO
:
1903 return snd_timer_user_ginfo(file
, argp
);
1904 case SNDRV_TIMER_IOCTL_GPARAMS
:
1905 return snd_timer_user_gparams(file
, argp
);
1906 case SNDRV_TIMER_IOCTL_GSTATUS
:
1907 return snd_timer_user_gstatus(file
, argp
);
1908 case SNDRV_TIMER_IOCTL_SELECT
:
1909 return snd_timer_user_tselect(file
, argp
);
1910 case SNDRV_TIMER_IOCTL_INFO
:
1911 return snd_timer_user_info(file
, argp
);
1912 case SNDRV_TIMER_IOCTL_PARAMS
:
1913 return snd_timer_user_params(file
, argp
);
1914 case SNDRV_TIMER_IOCTL_STATUS
:
1915 return snd_timer_user_status(file
, argp
);
1916 case SNDRV_TIMER_IOCTL_START
:
1917 case SNDRV_TIMER_IOCTL_START_OLD
:
1918 return snd_timer_user_start(file
);
1919 case SNDRV_TIMER_IOCTL_STOP
:
1920 case SNDRV_TIMER_IOCTL_STOP_OLD
:
1921 return snd_timer_user_stop(file
);
1922 case SNDRV_TIMER_IOCTL_CONTINUE
:
1923 case SNDRV_TIMER_IOCTL_CONTINUE_OLD
:
1924 return snd_timer_user_continue(file
);
1925 case SNDRV_TIMER_IOCTL_PAUSE
:
1926 case SNDRV_TIMER_IOCTL_PAUSE_OLD
:
1927 return snd_timer_user_pause(file
);
1932 static long snd_timer_user_ioctl(struct file
*file
, unsigned int cmd
,
1935 struct snd_timer_user
*tu
= file
->private_data
;
1938 mutex_lock(&tu
->ioctl_lock
);
1939 ret
= __snd_timer_user_ioctl(file
, cmd
, arg
);
1940 mutex_unlock(&tu
->ioctl_lock
);
1944 static int snd_timer_user_fasync(int fd
, struct file
* file
, int on
)
1946 struct snd_timer_user
*tu
;
1948 tu
= file
->private_data
;
1949 return fasync_helper(fd
, file
, on
, &tu
->fasync
);
1952 static ssize_t
snd_timer_user_read(struct file
*file
, char __user
*buffer
,
1953 size_t count
, loff_t
*offset
)
1955 struct snd_timer_user
*tu
;
1956 long result
= 0, unit
;
1960 tu
= file
->private_data
;
1961 unit
= tu
->tread
? sizeof(struct snd_timer_tread
) : sizeof(struct snd_timer_read
);
1962 spin_lock_irq(&tu
->qlock
);
1963 while ((long)count
- result
>= unit
) {
1964 while (!tu
->qused
) {
1967 if ((file
->f_flags
& O_NONBLOCK
) != 0 || result
> 0) {
1972 set_current_state(TASK_INTERRUPTIBLE
);
1973 init_waitqueue_entry(&wait
, current
);
1974 add_wait_queue(&tu
->qchange_sleep
, &wait
);
1976 spin_unlock_irq(&tu
->qlock
);
1978 spin_lock_irq(&tu
->qlock
);
1980 remove_wait_queue(&tu
->qchange_sleep
, &wait
);
1982 if (tu
->disconnected
) {
1986 if (signal_pending(current
)) {
1992 qhead
= tu
->qhead
++;
1993 tu
->qhead
%= tu
->queue_size
;
1995 spin_unlock_irq(&tu
->qlock
);
1997 mutex_lock(&tu
->ioctl_lock
);
1999 if (copy_to_user(buffer
, &tu
->tqueue
[qhead
],
2000 sizeof(struct snd_timer_tread
)))
2003 if (copy_to_user(buffer
, &tu
->queue
[qhead
],
2004 sizeof(struct snd_timer_read
)))
2007 mutex_unlock(&tu
->ioctl_lock
);
2009 spin_lock_irq(&tu
->qlock
);
2016 spin_unlock_irq(&tu
->qlock
);
2017 return result
> 0 ? result
: err
;
2020 static unsigned int snd_timer_user_poll(struct file
*file
, poll_table
* wait
)
2023 struct snd_timer_user
*tu
;
2025 tu
= file
->private_data
;
2027 poll_wait(file
, &tu
->qchange_sleep
, wait
);
2031 mask
|= POLLIN
| POLLRDNORM
;
2032 if (tu
->disconnected
)
2038 #ifdef CONFIG_COMPAT
2039 #include "timer_compat.c"
2041 #define snd_timer_user_ioctl_compat NULL
2044 static const struct file_operations snd_timer_f_ops
=
2046 .owner
= THIS_MODULE
,
2047 .read
= snd_timer_user_read
,
2048 .open
= snd_timer_user_open
,
2049 .release
= snd_timer_user_release
,
2050 .llseek
= no_llseek
,
2051 .poll
= snd_timer_user_poll
,
2052 .unlocked_ioctl
= snd_timer_user_ioctl
,
2053 .compat_ioctl
= snd_timer_user_ioctl_compat
,
2054 .fasync
= snd_timer_user_fasync
,
2057 /* unregister the system timer */
2058 static void snd_timer_free_all(void)
2060 struct snd_timer
*timer
, *n
;
2062 list_for_each_entry_safe(timer
, n
, &snd_timer_list
, device_list
)
2063 snd_timer_free(timer
);
2066 static struct device timer_dev
;
2072 static int __init
alsa_timer_init(void)
2076 snd_device_initialize(&timer_dev
, NULL
);
2077 dev_set_name(&timer_dev
, "timer");
2079 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2080 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS
, SNDRV_CARDS
- 1,
2084 err
= snd_timer_register_system();
2086 pr_err("ALSA: unable to register system timer (%i)\n", err
);
2087 put_device(&timer_dev
);
2091 err
= snd_register_device(SNDRV_DEVICE_TYPE_TIMER
, NULL
, 0,
2092 &snd_timer_f_ops
, NULL
, &timer_dev
);
2094 pr_err("ALSA: unable to register timer device (%i)\n", err
);
2095 snd_timer_free_all();
2096 put_device(&timer_dev
);
2100 snd_timer_proc_init();
2104 static void __exit
alsa_timer_exit(void)
2106 snd_unregister_device(&timer_dev
);
2107 snd_timer_free_all();
2108 put_device(&timer_dev
);
2109 snd_timer_proc_done();
2110 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2111 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS
, SNDRV_CARDS
- 1);
2115 module_init(alsa_timer_init
)
2116 module_exit(alsa_timer_exit
)
2118 EXPORT_SYMBOL(snd_timer_open
);
2119 EXPORT_SYMBOL(snd_timer_close
);
2120 EXPORT_SYMBOL(snd_timer_resolution
);
2121 EXPORT_SYMBOL(snd_timer_start
);
2122 EXPORT_SYMBOL(snd_timer_stop
);
2123 EXPORT_SYMBOL(snd_timer_continue
);
2124 EXPORT_SYMBOL(snd_timer_pause
);
2125 EXPORT_SYMBOL(snd_timer_new
);
2126 EXPORT_SYMBOL(snd_timer_notify
);
2127 EXPORT_SYMBOL(snd_timer_global_new
);
2128 EXPORT_SYMBOL(snd_timer_global_free
);
2129 EXPORT_SYMBOL(snd_timer_global_register
);
2130 EXPORT_SYMBOL(snd_timer_interrupt
);