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Merge remote-tracking branch 'regmap/topic/debugfs' into regmap-next
[deliverable/linux.git] / sound / core / timer.c
1 /*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
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.
10 *
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.
15 *
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
19 *
20 */
21
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>
37
38 #if IS_ENABLED(CONFIG_SND_HRTIMER)
39 #define DEFAULT_TIMER_LIMIT 4
40 #else
41 #define DEFAULT_TIMER_LIMIT 1
42 #endif
43
44 static int timer_limit = DEFAULT_TIMER_LIMIT;
45 static int timer_tstamp_monotonic = 1;
46 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
47 MODULE_DESCRIPTION("ALSA timer interface");
48 MODULE_LICENSE("GPL");
49 module_param(timer_limit, int, 0444);
50 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
51 module_param(timer_tstamp_monotonic, int, 0444);
52 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
53
54 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
55 MODULE_ALIAS("devname:snd/timer");
56
57 struct snd_timer_user {
58 struct snd_timer_instance *timeri;
59 int tread; /* enhanced read with timestamps and events */
60 unsigned long ticks;
61 unsigned long overrun;
62 int qhead;
63 int qtail;
64 int qused;
65 int queue_size;
66 bool disconnected;
67 struct snd_timer_read *queue;
68 struct snd_timer_tread *tqueue;
69 spinlock_t qlock;
70 unsigned long last_resolution;
71 unsigned int filter;
72 struct timespec tstamp; /* trigger tstamp */
73 wait_queue_head_t qchange_sleep;
74 struct fasync_struct *fasync;
75 struct mutex ioctl_lock;
76 };
77
78 /* list of timers */
79 static LIST_HEAD(snd_timer_list);
80
81 /* list of slave instances */
82 static LIST_HEAD(snd_timer_slave_list);
83
84 /* lock for slave active lists */
85 static DEFINE_SPINLOCK(slave_active_lock);
86
87 static DEFINE_MUTEX(register_mutex);
88
89 static int snd_timer_free(struct snd_timer *timer);
90 static int snd_timer_dev_free(struct snd_device *device);
91 static int snd_timer_dev_register(struct snd_device *device);
92 static int snd_timer_dev_disconnect(struct snd_device *device);
93
94 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
95
96 /*
97 * create a timer instance with the given owner string.
98 * when timer is not NULL, increments the module counter
99 */
100 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
101 struct snd_timer *timer)
102 {
103 struct snd_timer_instance *timeri;
104 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
105 if (timeri == NULL)
106 return NULL;
107 timeri->owner = kstrdup(owner, GFP_KERNEL);
108 if (! timeri->owner) {
109 kfree(timeri);
110 return NULL;
111 }
112 INIT_LIST_HEAD(&timeri->open_list);
113 INIT_LIST_HEAD(&timeri->active_list);
114 INIT_LIST_HEAD(&timeri->ack_list);
115 INIT_LIST_HEAD(&timeri->slave_list_head);
116 INIT_LIST_HEAD(&timeri->slave_active_head);
117
118 timeri->timer = timer;
119 if (timer && !try_module_get(timer->module)) {
120 kfree(timeri->owner);
121 kfree(timeri);
122 return NULL;
123 }
124
125 return timeri;
126 }
127
128 /*
129 * find a timer instance from the given timer id
130 */
131 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
132 {
133 struct snd_timer *timer = NULL;
134
135 list_for_each_entry(timer, &snd_timer_list, device_list) {
136 if (timer->tmr_class != tid->dev_class)
137 continue;
138 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
139 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
140 (timer->card == NULL ||
141 timer->card->number != tid->card))
142 continue;
143 if (timer->tmr_device != tid->device)
144 continue;
145 if (timer->tmr_subdevice != tid->subdevice)
146 continue;
147 return timer;
148 }
149 return NULL;
150 }
151
152 #ifdef CONFIG_MODULES
153
154 static void snd_timer_request(struct snd_timer_id *tid)
155 {
156 switch (tid->dev_class) {
157 case SNDRV_TIMER_CLASS_GLOBAL:
158 if (tid->device < timer_limit)
159 request_module("snd-timer-%i", tid->device);
160 break;
161 case SNDRV_TIMER_CLASS_CARD:
162 case SNDRV_TIMER_CLASS_PCM:
163 if (tid->card < snd_ecards_limit)
164 request_module("snd-card-%i", tid->card);
165 break;
166 default:
167 break;
168 }
169 }
170
171 #endif
172
173 /*
174 * look for a master instance matching with the slave id of the given slave.
175 * when found, relink the open_link of the slave.
176 *
177 * call this with register_mutex down.
178 */
179 static void snd_timer_check_slave(struct snd_timer_instance *slave)
180 {
181 struct snd_timer *timer;
182 struct snd_timer_instance *master;
183
184 /* FIXME: it's really dumb to look up all entries.. */
185 list_for_each_entry(timer, &snd_timer_list, device_list) {
186 list_for_each_entry(master, &timer->open_list_head, open_list) {
187 if (slave->slave_class == master->slave_class &&
188 slave->slave_id == master->slave_id) {
189 list_move_tail(&slave->open_list,
190 &master->slave_list_head);
191 spin_lock_irq(&slave_active_lock);
192 slave->master = master;
193 slave->timer = master->timer;
194 spin_unlock_irq(&slave_active_lock);
195 return;
196 }
197 }
198 }
199 }
200
201 /*
202 * look for slave instances matching with the slave id of the given master.
203 * when found, relink the open_link of slaves.
204 *
205 * call this with register_mutex down.
206 */
207 static void snd_timer_check_master(struct snd_timer_instance *master)
208 {
209 struct snd_timer_instance *slave, *tmp;
210
211 /* check all pending slaves */
212 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
213 if (slave->slave_class == master->slave_class &&
214 slave->slave_id == master->slave_id) {
215 list_move_tail(&slave->open_list, &master->slave_list_head);
216 spin_lock_irq(&slave_active_lock);
217 spin_lock(&master->timer->lock);
218 slave->master = master;
219 slave->timer = master->timer;
220 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
221 list_add_tail(&slave->active_list,
222 &master->slave_active_head);
223 spin_unlock(&master->timer->lock);
224 spin_unlock_irq(&slave_active_lock);
225 }
226 }
227 }
228
229 /*
230 * open a timer instance
231 * when opening a master, the slave id must be here given.
232 */
233 int snd_timer_open(struct snd_timer_instance **ti,
234 char *owner, struct snd_timer_id *tid,
235 unsigned int slave_id)
236 {
237 struct snd_timer *timer;
238 struct snd_timer_instance *timeri = NULL;
239
240 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
241 /* open a slave instance */
242 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
243 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
244 pr_debug("ALSA: timer: invalid slave class %i\n",
245 tid->dev_sclass);
246 return -EINVAL;
247 }
248 mutex_lock(&register_mutex);
249 timeri = snd_timer_instance_new(owner, NULL);
250 if (!timeri) {
251 mutex_unlock(&register_mutex);
252 return -ENOMEM;
253 }
254 timeri->slave_class = tid->dev_sclass;
255 timeri->slave_id = tid->device;
256 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
257 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
258 snd_timer_check_slave(timeri);
259 mutex_unlock(&register_mutex);
260 *ti = timeri;
261 return 0;
262 }
263
264 /* open a master instance */
265 mutex_lock(&register_mutex);
266 timer = snd_timer_find(tid);
267 #ifdef CONFIG_MODULES
268 if (!timer) {
269 mutex_unlock(&register_mutex);
270 snd_timer_request(tid);
271 mutex_lock(&register_mutex);
272 timer = snd_timer_find(tid);
273 }
274 #endif
275 if (!timer) {
276 mutex_unlock(&register_mutex);
277 return -ENODEV;
278 }
279 if (!list_empty(&timer->open_list_head)) {
280 timeri = list_entry(timer->open_list_head.next,
281 struct snd_timer_instance, open_list);
282 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
283 mutex_unlock(&register_mutex);
284 return -EBUSY;
285 }
286 }
287 timeri = snd_timer_instance_new(owner, timer);
288 if (!timeri) {
289 mutex_unlock(&register_mutex);
290 return -ENOMEM;
291 }
292 /* take a card refcount for safe disconnection */
293 if (timer->card)
294 get_device(&timer->card->card_dev);
295 timeri->slave_class = tid->dev_sclass;
296 timeri->slave_id = slave_id;
297 if (list_empty(&timer->open_list_head) && timer->hw.open)
298 timer->hw.open(timer);
299 list_add_tail(&timeri->open_list, &timer->open_list_head);
300 snd_timer_check_master(timeri);
301 mutex_unlock(&register_mutex);
302 *ti = timeri;
303 return 0;
304 }
305
306 /*
307 * close a timer instance
308 */
309 int snd_timer_close(struct snd_timer_instance *timeri)
310 {
311 struct snd_timer *timer = NULL;
312 struct snd_timer_instance *slave, *tmp;
313
314 if (snd_BUG_ON(!timeri))
315 return -ENXIO;
316
317 mutex_lock(&register_mutex);
318 list_del(&timeri->open_list);
319
320 /* force to stop the timer */
321 snd_timer_stop(timeri);
322
323 timer = timeri->timer;
324 if (timer) {
325 /* wait, until the active callback is finished */
326 spin_lock_irq(&timer->lock);
327 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
328 spin_unlock_irq(&timer->lock);
329 udelay(10);
330 spin_lock_irq(&timer->lock);
331 }
332 spin_unlock_irq(&timer->lock);
333
334 /* remove slave links */
335 spin_lock_irq(&slave_active_lock);
336 spin_lock(&timer->lock);
337 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
338 open_list) {
339 list_move_tail(&slave->open_list, &snd_timer_slave_list);
340 slave->master = NULL;
341 slave->timer = NULL;
342 list_del_init(&slave->ack_list);
343 list_del_init(&slave->active_list);
344 }
345 spin_unlock(&timer->lock);
346 spin_unlock_irq(&slave_active_lock);
347
348 /* slave doesn't need to release timer resources below */
349 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
350 timer = NULL;
351 }
352
353 if (timeri->private_free)
354 timeri->private_free(timeri);
355 kfree(timeri->owner);
356 kfree(timeri);
357
358 if (timer) {
359 if (list_empty(&timer->open_list_head) && timer->hw.close)
360 timer->hw.close(timer);
361 /* release a card refcount for safe disconnection */
362 if (timer->card)
363 put_device(&timer->card->card_dev);
364 module_put(timer->module);
365 }
366
367 mutex_unlock(&register_mutex);
368 return 0;
369 }
370
371 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
372 {
373 struct snd_timer * timer;
374
375 if (timeri == NULL)
376 return 0;
377 if ((timer = timeri->timer) != NULL) {
378 if (timer->hw.c_resolution)
379 return timer->hw.c_resolution(timer);
380 return timer->hw.resolution;
381 }
382 return 0;
383 }
384
385 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
386 {
387 struct snd_timer *timer;
388 unsigned long resolution = 0;
389 struct snd_timer_instance *ts;
390 struct timespec tstamp;
391
392 if (timer_tstamp_monotonic)
393 ktime_get_ts(&tstamp);
394 else
395 getnstimeofday(&tstamp);
396 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
397 event > SNDRV_TIMER_EVENT_PAUSE))
398 return;
399 if (event == SNDRV_TIMER_EVENT_START ||
400 event == SNDRV_TIMER_EVENT_CONTINUE)
401 resolution = snd_timer_resolution(ti);
402 if (ti->ccallback)
403 ti->ccallback(ti, event, &tstamp, resolution);
404 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
405 return;
406 timer = ti->timer;
407 if (timer == NULL)
408 return;
409 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
410 return;
411 list_for_each_entry(ts, &ti->slave_active_head, active_list)
412 if (ts->ccallback)
413 ts->ccallback(ts, event + 100, &tstamp, resolution);
414 }
415
416 /* start/continue a master timer */
417 static int snd_timer_start1(struct snd_timer_instance *timeri,
418 bool start, unsigned long ticks)
419 {
420 struct snd_timer *timer;
421 int result;
422 unsigned long flags;
423
424 timer = timeri->timer;
425 if (!timer)
426 return -EINVAL;
427
428 spin_lock_irqsave(&timer->lock, flags);
429 if (timer->card && timer->card->shutdown) {
430 result = -ENODEV;
431 goto unlock;
432 }
433 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
434 SNDRV_TIMER_IFLG_START)) {
435 result = -EBUSY;
436 goto unlock;
437 }
438
439 if (start)
440 timeri->ticks = timeri->cticks = ticks;
441 else if (!timeri->cticks)
442 timeri->cticks = 1;
443 timeri->pticks = 0;
444
445 list_move_tail(&timeri->active_list, &timer->active_list_head);
446 if (timer->running) {
447 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
448 goto __start_now;
449 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
450 timeri->flags |= SNDRV_TIMER_IFLG_START;
451 result = 1; /* delayed start */
452 } else {
453 if (start)
454 timer->sticks = ticks;
455 timer->hw.start(timer);
456 __start_now:
457 timer->running++;
458 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
459 result = 0;
460 }
461 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
462 SNDRV_TIMER_EVENT_CONTINUE);
463 unlock:
464 spin_unlock_irqrestore(&timer->lock, flags);
465 return result;
466 }
467
468 /* start/continue a slave timer */
469 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
470 bool start)
471 {
472 unsigned long flags;
473
474 spin_lock_irqsave(&slave_active_lock, flags);
475 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
476 spin_unlock_irqrestore(&slave_active_lock, flags);
477 return -EBUSY;
478 }
479 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
480 if (timeri->master && timeri->timer) {
481 spin_lock(&timeri->timer->lock);
482 list_add_tail(&timeri->active_list,
483 &timeri->master->slave_active_head);
484 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
485 SNDRV_TIMER_EVENT_CONTINUE);
486 spin_unlock(&timeri->timer->lock);
487 }
488 spin_unlock_irqrestore(&slave_active_lock, flags);
489 return 1; /* delayed start */
490 }
491
492 /* stop/pause a master timer */
493 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
494 {
495 struct snd_timer *timer;
496 int result = 0;
497 unsigned long flags;
498
499 timer = timeri->timer;
500 if (!timer)
501 return -EINVAL;
502 spin_lock_irqsave(&timer->lock, flags);
503 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
504 SNDRV_TIMER_IFLG_START))) {
505 result = -EBUSY;
506 goto unlock;
507 }
508 list_del_init(&timeri->ack_list);
509 list_del_init(&timeri->active_list);
510 if (timer->card && timer->card->shutdown)
511 goto unlock;
512 if (stop) {
513 timeri->cticks = timeri->ticks;
514 timeri->pticks = 0;
515 }
516 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
517 !(--timer->running)) {
518 timer->hw.stop(timer);
519 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
520 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
521 snd_timer_reschedule(timer, 0);
522 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
523 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
524 timer->hw.start(timer);
525 }
526 }
527 }
528 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
529 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
530 SNDRV_TIMER_EVENT_CONTINUE);
531 unlock:
532 spin_unlock_irqrestore(&timer->lock, flags);
533 return result;
534 }
535
536 /* stop/pause a slave timer */
537 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
538 {
539 unsigned long flags;
540
541 spin_lock_irqsave(&slave_active_lock, flags);
542 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
543 spin_unlock_irqrestore(&slave_active_lock, flags);
544 return -EBUSY;
545 }
546 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
547 if (timeri->timer) {
548 spin_lock(&timeri->timer->lock);
549 list_del_init(&timeri->ack_list);
550 list_del_init(&timeri->active_list);
551 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
552 SNDRV_TIMER_EVENT_CONTINUE);
553 spin_unlock(&timeri->timer->lock);
554 }
555 spin_unlock_irqrestore(&slave_active_lock, flags);
556 return 0;
557 }
558
559 /*
560 * start the timer instance
561 */
562 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
563 {
564 if (timeri == NULL || ticks < 1)
565 return -EINVAL;
566 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
567 return snd_timer_start_slave(timeri, true);
568 else
569 return snd_timer_start1(timeri, true, ticks);
570 }
571
572 /*
573 * stop the timer instance.
574 *
575 * do not call this from the timer callback!
576 */
577 int snd_timer_stop(struct snd_timer_instance *timeri)
578 {
579 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
580 return snd_timer_stop_slave(timeri, true);
581 else
582 return snd_timer_stop1(timeri, true);
583 }
584
585 /*
586 * start again.. the tick is kept.
587 */
588 int snd_timer_continue(struct snd_timer_instance *timeri)
589 {
590 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
591 return snd_timer_start_slave(timeri, false);
592 else
593 return snd_timer_start1(timeri, false, 0);
594 }
595
596 /*
597 * pause.. remember the ticks left
598 */
599 int snd_timer_pause(struct snd_timer_instance * timeri)
600 {
601 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
602 return snd_timer_stop_slave(timeri, false);
603 else
604 return snd_timer_stop1(timeri, false);
605 }
606
607 /*
608 * reschedule the timer
609 *
610 * start pending instances and check the scheduling ticks.
611 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
612 */
613 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
614 {
615 struct snd_timer_instance *ti;
616 unsigned long ticks = ~0UL;
617
618 list_for_each_entry(ti, &timer->active_list_head, active_list) {
619 if (ti->flags & SNDRV_TIMER_IFLG_START) {
620 ti->flags &= ~SNDRV_TIMER_IFLG_START;
621 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
622 timer->running++;
623 }
624 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
625 if (ticks > ti->cticks)
626 ticks = ti->cticks;
627 }
628 }
629 if (ticks == ~0UL) {
630 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
631 return;
632 }
633 if (ticks > timer->hw.ticks)
634 ticks = timer->hw.ticks;
635 if (ticks_left != ticks)
636 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
637 timer->sticks = ticks;
638 }
639
640 /*
641 * timer tasklet
642 *
643 */
644 static void snd_timer_tasklet(unsigned long arg)
645 {
646 struct snd_timer *timer = (struct snd_timer *) arg;
647 struct snd_timer_instance *ti;
648 struct list_head *p;
649 unsigned long resolution, ticks;
650 unsigned long flags;
651
652 if (timer->card && timer->card->shutdown)
653 return;
654
655 spin_lock_irqsave(&timer->lock, flags);
656 /* now process all callbacks */
657 while (!list_empty(&timer->sack_list_head)) {
658 p = timer->sack_list_head.next; /* get first item */
659 ti = list_entry(p, struct snd_timer_instance, ack_list);
660
661 /* remove from ack_list and make empty */
662 list_del_init(p);
663
664 ticks = ti->pticks;
665 ti->pticks = 0;
666 resolution = ti->resolution;
667
668 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
669 spin_unlock(&timer->lock);
670 if (ti->callback)
671 ti->callback(ti, resolution, ticks);
672 spin_lock(&timer->lock);
673 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
674 }
675 spin_unlock_irqrestore(&timer->lock, flags);
676 }
677
678 /*
679 * timer interrupt
680 *
681 * ticks_left is usually equal to timer->sticks.
682 *
683 */
684 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
685 {
686 struct snd_timer_instance *ti, *ts, *tmp;
687 unsigned long resolution, ticks;
688 struct list_head *p, *ack_list_head;
689 unsigned long flags;
690 int use_tasklet = 0;
691
692 if (timer == NULL)
693 return;
694
695 if (timer->card && timer->card->shutdown)
696 return;
697
698 spin_lock_irqsave(&timer->lock, flags);
699
700 /* remember the current resolution */
701 if (timer->hw.c_resolution)
702 resolution = timer->hw.c_resolution(timer);
703 else
704 resolution = timer->hw.resolution;
705
706 /* loop for all active instances
707 * Here we cannot use list_for_each_entry because the active_list of a
708 * processed instance is relinked to done_list_head before the callback
709 * is called.
710 */
711 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
712 active_list) {
713 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
714 continue;
715 ti->pticks += ticks_left;
716 ti->resolution = resolution;
717 if (ti->cticks < ticks_left)
718 ti->cticks = 0;
719 else
720 ti->cticks -= ticks_left;
721 if (ti->cticks) /* not expired */
722 continue;
723 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
724 ti->cticks = ti->ticks;
725 } else {
726 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
727 --timer->running;
728 list_del_init(&ti->active_list);
729 }
730 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
731 (ti->flags & SNDRV_TIMER_IFLG_FAST))
732 ack_list_head = &timer->ack_list_head;
733 else
734 ack_list_head = &timer->sack_list_head;
735 if (list_empty(&ti->ack_list))
736 list_add_tail(&ti->ack_list, ack_list_head);
737 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
738 ts->pticks = ti->pticks;
739 ts->resolution = resolution;
740 if (list_empty(&ts->ack_list))
741 list_add_tail(&ts->ack_list, ack_list_head);
742 }
743 }
744 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
745 snd_timer_reschedule(timer, timer->sticks);
746 if (timer->running) {
747 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
748 timer->hw.stop(timer);
749 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
750 }
751 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
752 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
753 /* restart timer */
754 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
755 timer->hw.start(timer);
756 }
757 } else {
758 timer->hw.stop(timer);
759 }
760
761 /* now process all fast callbacks */
762 while (!list_empty(&timer->ack_list_head)) {
763 p = timer->ack_list_head.next; /* get first item */
764 ti = list_entry(p, struct snd_timer_instance, ack_list);
765
766 /* remove from ack_list and make empty */
767 list_del_init(p);
768
769 ticks = ti->pticks;
770 ti->pticks = 0;
771
772 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
773 spin_unlock(&timer->lock);
774 if (ti->callback)
775 ti->callback(ti, resolution, ticks);
776 spin_lock(&timer->lock);
777 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
778 }
779
780 /* do we have any slow callbacks? */
781 use_tasklet = !list_empty(&timer->sack_list_head);
782 spin_unlock_irqrestore(&timer->lock, flags);
783
784 if (use_tasklet)
785 tasklet_schedule(&timer->task_queue);
786 }
787
788 /*
789
790 */
791
792 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
793 struct snd_timer **rtimer)
794 {
795 struct snd_timer *timer;
796 int err;
797 static struct snd_device_ops ops = {
798 .dev_free = snd_timer_dev_free,
799 .dev_register = snd_timer_dev_register,
800 .dev_disconnect = snd_timer_dev_disconnect,
801 };
802
803 if (snd_BUG_ON(!tid))
804 return -EINVAL;
805 if (rtimer)
806 *rtimer = NULL;
807 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
808 if (!timer)
809 return -ENOMEM;
810 timer->tmr_class = tid->dev_class;
811 timer->card = card;
812 timer->tmr_device = tid->device;
813 timer->tmr_subdevice = tid->subdevice;
814 if (id)
815 strlcpy(timer->id, id, sizeof(timer->id));
816 INIT_LIST_HEAD(&timer->device_list);
817 INIT_LIST_HEAD(&timer->open_list_head);
818 INIT_LIST_HEAD(&timer->active_list_head);
819 INIT_LIST_HEAD(&timer->ack_list_head);
820 INIT_LIST_HEAD(&timer->sack_list_head);
821 spin_lock_init(&timer->lock);
822 tasklet_init(&timer->task_queue, snd_timer_tasklet,
823 (unsigned long)timer);
824 if (card != NULL) {
825 timer->module = card->module;
826 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
827 if (err < 0) {
828 snd_timer_free(timer);
829 return err;
830 }
831 }
832 if (rtimer)
833 *rtimer = timer;
834 return 0;
835 }
836
837 static int snd_timer_free(struct snd_timer *timer)
838 {
839 if (!timer)
840 return 0;
841
842 mutex_lock(&register_mutex);
843 if (! list_empty(&timer->open_list_head)) {
844 struct list_head *p, *n;
845 struct snd_timer_instance *ti;
846 pr_warn("ALSA: timer %p is busy?\n", timer);
847 list_for_each_safe(p, n, &timer->open_list_head) {
848 list_del_init(p);
849 ti = list_entry(p, struct snd_timer_instance, open_list);
850 ti->timer = NULL;
851 }
852 }
853 list_del(&timer->device_list);
854 mutex_unlock(&register_mutex);
855
856 if (timer->private_free)
857 timer->private_free(timer);
858 kfree(timer);
859 return 0;
860 }
861
862 static int snd_timer_dev_free(struct snd_device *device)
863 {
864 struct snd_timer *timer = device->device_data;
865 return snd_timer_free(timer);
866 }
867
868 static int snd_timer_dev_register(struct snd_device *dev)
869 {
870 struct snd_timer *timer = dev->device_data;
871 struct snd_timer *timer1;
872
873 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
874 return -ENXIO;
875 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
876 !timer->hw.resolution && timer->hw.c_resolution == NULL)
877 return -EINVAL;
878
879 mutex_lock(&register_mutex);
880 list_for_each_entry(timer1, &snd_timer_list, device_list) {
881 if (timer1->tmr_class > timer->tmr_class)
882 break;
883 if (timer1->tmr_class < timer->tmr_class)
884 continue;
885 if (timer1->card && timer->card) {
886 if (timer1->card->number > timer->card->number)
887 break;
888 if (timer1->card->number < timer->card->number)
889 continue;
890 }
891 if (timer1->tmr_device > timer->tmr_device)
892 break;
893 if (timer1->tmr_device < timer->tmr_device)
894 continue;
895 if (timer1->tmr_subdevice > timer->tmr_subdevice)
896 break;
897 if (timer1->tmr_subdevice < timer->tmr_subdevice)
898 continue;
899 /* conflicts.. */
900 mutex_unlock(&register_mutex);
901 return -EBUSY;
902 }
903 list_add_tail(&timer->device_list, &timer1->device_list);
904 mutex_unlock(&register_mutex);
905 return 0;
906 }
907
908 static int snd_timer_dev_disconnect(struct snd_device *device)
909 {
910 struct snd_timer *timer = device->device_data;
911 struct snd_timer_instance *ti;
912
913 mutex_lock(&register_mutex);
914 list_del_init(&timer->device_list);
915 /* wake up pending sleepers */
916 list_for_each_entry(ti, &timer->open_list_head, open_list) {
917 if (ti->disconnect)
918 ti->disconnect(ti);
919 }
920 mutex_unlock(&register_mutex);
921 return 0;
922 }
923
924 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
925 {
926 unsigned long flags;
927 unsigned long resolution = 0;
928 struct snd_timer_instance *ti, *ts;
929
930 if (timer->card && timer->card->shutdown)
931 return;
932 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
933 return;
934 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
935 event > SNDRV_TIMER_EVENT_MRESUME))
936 return;
937 spin_lock_irqsave(&timer->lock, flags);
938 if (event == SNDRV_TIMER_EVENT_MSTART ||
939 event == SNDRV_TIMER_EVENT_MCONTINUE ||
940 event == SNDRV_TIMER_EVENT_MRESUME) {
941 if (timer->hw.c_resolution)
942 resolution = timer->hw.c_resolution(timer);
943 else
944 resolution = timer->hw.resolution;
945 }
946 list_for_each_entry(ti, &timer->active_list_head, active_list) {
947 if (ti->ccallback)
948 ti->ccallback(ti, event, tstamp, resolution);
949 list_for_each_entry(ts, &ti->slave_active_head, active_list)
950 if (ts->ccallback)
951 ts->ccallback(ts, event, tstamp, resolution);
952 }
953 spin_unlock_irqrestore(&timer->lock, flags);
954 }
955
956 /*
957 * exported functions for global timers
958 */
959 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
960 {
961 struct snd_timer_id tid;
962
963 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
964 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
965 tid.card = -1;
966 tid.device = device;
967 tid.subdevice = 0;
968 return snd_timer_new(NULL, id, &tid, rtimer);
969 }
970
971 int snd_timer_global_free(struct snd_timer *timer)
972 {
973 return snd_timer_free(timer);
974 }
975
976 int snd_timer_global_register(struct snd_timer *timer)
977 {
978 struct snd_device dev;
979
980 memset(&dev, 0, sizeof(dev));
981 dev.device_data = timer;
982 return snd_timer_dev_register(&dev);
983 }
984
985 /*
986 * System timer
987 */
988
989 struct snd_timer_system_private {
990 struct timer_list tlist;
991 unsigned long last_expires;
992 unsigned long last_jiffies;
993 unsigned long correction;
994 };
995
996 static void snd_timer_s_function(unsigned long data)
997 {
998 struct snd_timer *timer = (struct snd_timer *)data;
999 struct snd_timer_system_private *priv = timer->private_data;
1000 unsigned long jiff = jiffies;
1001 if (time_after(jiff, priv->last_expires))
1002 priv->correction += (long)jiff - (long)priv->last_expires;
1003 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1004 }
1005
1006 static int snd_timer_s_start(struct snd_timer * timer)
1007 {
1008 struct snd_timer_system_private *priv;
1009 unsigned long njiff;
1010
1011 priv = (struct snd_timer_system_private *) timer->private_data;
1012 njiff = (priv->last_jiffies = jiffies);
1013 if (priv->correction > timer->sticks - 1) {
1014 priv->correction -= timer->sticks - 1;
1015 njiff++;
1016 } else {
1017 njiff += timer->sticks - priv->correction;
1018 priv->correction = 0;
1019 }
1020 priv->last_expires = njiff;
1021 mod_timer(&priv->tlist, njiff);
1022 return 0;
1023 }
1024
1025 static int snd_timer_s_stop(struct snd_timer * timer)
1026 {
1027 struct snd_timer_system_private *priv;
1028 unsigned long jiff;
1029
1030 priv = (struct snd_timer_system_private *) timer->private_data;
1031 del_timer(&priv->tlist);
1032 jiff = jiffies;
1033 if (time_before(jiff, priv->last_expires))
1034 timer->sticks = priv->last_expires - jiff;
1035 else
1036 timer->sticks = 1;
1037 priv->correction = 0;
1038 return 0;
1039 }
1040
1041 static int snd_timer_s_close(struct snd_timer *timer)
1042 {
1043 struct snd_timer_system_private *priv;
1044
1045 priv = (struct snd_timer_system_private *)timer->private_data;
1046 del_timer_sync(&priv->tlist);
1047 return 0;
1048 }
1049
1050 static struct snd_timer_hardware snd_timer_system =
1051 {
1052 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1053 .resolution = 1000000000L / HZ,
1054 .ticks = 10000000L,
1055 .close = snd_timer_s_close,
1056 .start = snd_timer_s_start,
1057 .stop = snd_timer_s_stop
1058 };
1059
1060 static void snd_timer_free_system(struct snd_timer *timer)
1061 {
1062 kfree(timer->private_data);
1063 }
1064
1065 static int snd_timer_register_system(void)
1066 {
1067 struct snd_timer *timer;
1068 struct snd_timer_system_private *priv;
1069 int err;
1070
1071 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1072 if (err < 0)
1073 return err;
1074 strcpy(timer->name, "system timer");
1075 timer->hw = snd_timer_system;
1076 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1077 if (priv == NULL) {
1078 snd_timer_free(timer);
1079 return -ENOMEM;
1080 }
1081 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1082 timer->private_data = priv;
1083 timer->private_free = snd_timer_free_system;
1084 return snd_timer_global_register(timer);
1085 }
1086
1087 #ifdef CONFIG_SND_PROC_FS
1088 /*
1089 * Info interface
1090 */
1091
1092 static void snd_timer_proc_read(struct snd_info_entry *entry,
1093 struct snd_info_buffer *buffer)
1094 {
1095 struct snd_timer *timer;
1096 struct snd_timer_instance *ti;
1097
1098 mutex_lock(&register_mutex);
1099 list_for_each_entry(timer, &snd_timer_list, device_list) {
1100 if (timer->card && timer->card->shutdown)
1101 continue;
1102 switch (timer->tmr_class) {
1103 case SNDRV_TIMER_CLASS_GLOBAL:
1104 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1105 break;
1106 case SNDRV_TIMER_CLASS_CARD:
1107 snd_iprintf(buffer, "C%i-%i: ",
1108 timer->card->number, timer->tmr_device);
1109 break;
1110 case SNDRV_TIMER_CLASS_PCM:
1111 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1112 timer->tmr_device, timer->tmr_subdevice);
1113 break;
1114 default:
1115 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1116 timer->card ? timer->card->number : -1,
1117 timer->tmr_device, timer->tmr_subdevice);
1118 }
1119 snd_iprintf(buffer, "%s :", timer->name);
1120 if (timer->hw.resolution)
1121 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1122 timer->hw.resolution / 1000,
1123 timer->hw.resolution % 1000,
1124 timer->hw.ticks);
1125 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1126 snd_iprintf(buffer, " SLAVE");
1127 snd_iprintf(buffer, "\n");
1128 list_for_each_entry(ti, &timer->open_list_head, open_list)
1129 snd_iprintf(buffer, " Client %s : %s\n",
1130 ti->owner ? ti->owner : "unknown",
1131 ti->flags & (SNDRV_TIMER_IFLG_START |
1132 SNDRV_TIMER_IFLG_RUNNING)
1133 ? "running" : "stopped");
1134 }
1135 mutex_unlock(&register_mutex);
1136 }
1137
1138 static struct snd_info_entry *snd_timer_proc_entry;
1139
1140 static void __init snd_timer_proc_init(void)
1141 {
1142 struct snd_info_entry *entry;
1143
1144 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1145 if (entry != NULL) {
1146 entry->c.text.read = snd_timer_proc_read;
1147 if (snd_info_register(entry) < 0) {
1148 snd_info_free_entry(entry);
1149 entry = NULL;
1150 }
1151 }
1152 snd_timer_proc_entry = entry;
1153 }
1154
1155 static void __exit snd_timer_proc_done(void)
1156 {
1157 snd_info_free_entry(snd_timer_proc_entry);
1158 }
1159 #else /* !CONFIG_SND_PROC_FS */
1160 #define snd_timer_proc_init()
1161 #define snd_timer_proc_done()
1162 #endif
1163
1164 /*
1165 * USER SPACE interface
1166 */
1167
1168 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1169 unsigned long resolution,
1170 unsigned long ticks)
1171 {
1172 struct snd_timer_user *tu = timeri->callback_data;
1173 struct snd_timer_read *r;
1174 int prev;
1175
1176 spin_lock(&tu->qlock);
1177 if (tu->qused > 0) {
1178 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1179 r = &tu->queue[prev];
1180 if (r->resolution == resolution) {
1181 r->ticks += ticks;
1182 goto __wake;
1183 }
1184 }
1185 if (tu->qused >= tu->queue_size) {
1186 tu->overrun++;
1187 } else {
1188 r = &tu->queue[tu->qtail++];
1189 tu->qtail %= tu->queue_size;
1190 r->resolution = resolution;
1191 r->ticks = ticks;
1192 tu->qused++;
1193 }
1194 __wake:
1195 spin_unlock(&tu->qlock);
1196 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1197 wake_up(&tu->qchange_sleep);
1198 }
1199
1200 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1201 struct snd_timer_tread *tread)
1202 {
1203 if (tu->qused >= tu->queue_size) {
1204 tu->overrun++;
1205 } else {
1206 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1207 tu->qtail %= tu->queue_size;
1208 tu->qused++;
1209 }
1210 }
1211
1212 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1213 int event,
1214 struct timespec *tstamp,
1215 unsigned long resolution)
1216 {
1217 struct snd_timer_user *tu = timeri->callback_data;
1218 struct snd_timer_tread r1;
1219 unsigned long flags;
1220
1221 if (event >= SNDRV_TIMER_EVENT_START &&
1222 event <= SNDRV_TIMER_EVENT_PAUSE)
1223 tu->tstamp = *tstamp;
1224 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1225 return;
1226 memset(&r1, 0, sizeof(r1));
1227 r1.event = event;
1228 r1.tstamp = *tstamp;
1229 r1.val = resolution;
1230 spin_lock_irqsave(&tu->qlock, flags);
1231 snd_timer_user_append_to_tqueue(tu, &r1);
1232 spin_unlock_irqrestore(&tu->qlock, flags);
1233 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1234 wake_up(&tu->qchange_sleep);
1235 }
1236
1237 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1238 {
1239 struct snd_timer_user *tu = timeri->callback_data;
1240
1241 tu->disconnected = true;
1242 wake_up(&tu->qchange_sleep);
1243 }
1244
1245 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1246 unsigned long resolution,
1247 unsigned long ticks)
1248 {
1249 struct snd_timer_user *tu = timeri->callback_data;
1250 struct snd_timer_tread *r, r1;
1251 struct timespec tstamp;
1252 int prev, append = 0;
1253
1254 memset(&tstamp, 0, sizeof(tstamp));
1255 spin_lock(&tu->qlock);
1256 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1257 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1258 spin_unlock(&tu->qlock);
1259 return;
1260 }
1261 if (tu->last_resolution != resolution || ticks > 0) {
1262 if (timer_tstamp_monotonic)
1263 ktime_get_ts(&tstamp);
1264 else
1265 getnstimeofday(&tstamp);
1266 }
1267 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1268 tu->last_resolution != resolution) {
1269 memset(&r1, 0, sizeof(r1));
1270 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1271 r1.tstamp = tstamp;
1272 r1.val = resolution;
1273 snd_timer_user_append_to_tqueue(tu, &r1);
1274 tu->last_resolution = resolution;
1275 append++;
1276 }
1277 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1278 goto __wake;
1279 if (ticks == 0)
1280 goto __wake;
1281 if (tu->qused > 0) {
1282 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1283 r = &tu->tqueue[prev];
1284 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1285 r->tstamp = tstamp;
1286 r->val += ticks;
1287 append++;
1288 goto __wake;
1289 }
1290 }
1291 r1.event = SNDRV_TIMER_EVENT_TICK;
1292 r1.tstamp = tstamp;
1293 r1.val = ticks;
1294 snd_timer_user_append_to_tqueue(tu, &r1);
1295 append++;
1296 __wake:
1297 spin_unlock(&tu->qlock);
1298 if (append == 0)
1299 return;
1300 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1301 wake_up(&tu->qchange_sleep);
1302 }
1303
1304 static int snd_timer_user_open(struct inode *inode, struct file *file)
1305 {
1306 struct snd_timer_user *tu;
1307 int err;
1308
1309 err = nonseekable_open(inode, file);
1310 if (err < 0)
1311 return err;
1312
1313 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1314 if (tu == NULL)
1315 return -ENOMEM;
1316 spin_lock_init(&tu->qlock);
1317 init_waitqueue_head(&tu->qchange_sleep);
1318 mutex_init(&tu->ioctl_lock);
1319 tu->ticks = 1;
1320 tu->queue_size = 128;
1321 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1322 GFP_KERNEL);
1323 if (tu->queue == NULL) {
1324 kfree(tu);
1325 return -ENOMEM;
1326 }
1327 file->private_data = tu;
1328 return 0;
1329 }
1330
1331 static int snd_timer_user_release(struct inode *inode, struct file *file)
1332 {
1333 struct snd_timer_user *tu;
1334
1335 if (file->private_data) {
1336 tu = file->private_data;
1337 file->private_data = NULL;
1338 mutex_lock(&tu->ioctl_lock);
1339 if (tu->timeri)
1340 snd_timer_close(tu->timeri);
1341 mutex_unlock(&tu->ioctl_lock);
1342 kfree(tu->queue);
1343 kfree(tu->tqueue);
1344 kfree(tu);
1345 }
1346 return 0;
1347 }
1348
1349 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1350 {
1351 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1352 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1353 id->card = -1;
1354 id->device = -1;
1355 id->subdevice = -1;
1356 }
1357
1358 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1359 {
1360 id->dev_class = timer->tmr_class;
1361 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1362 id->card = timer->card ? timer->card->number : -1;
1363 id->device = timer->tmr_device;
1364 id->subdevice = timer->tmr_subdevice;
1365 }
1366
1367 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1368 {
1369 struct snd_timer_id id;
1370 struct snd_timer *timer;
1371 struct list_head *p;
1372
1373 if (copy_from_user(&id, _tid, sizeof(id)))
1374 return -EFAULT;
1375 mutex_lock(&register_mutex);
1376 if (id.dev_class < 0) { /* first item */
1377 if (list_empty(&snd_timer_list))
1378 snd_timer_user_zero_id(&id);
1379 else {
1380 timer = list_entry(snd_timer_list.next,
1381 struct snd_timer, device_list);
1382 snd_timer_user_copy_id(&id, timer);
1383 }
1384 } else {
1385 switch (id.dev_class) {
1386 case SNDRV_TIMER_CLASS_GLOBAL:
1387 id.device = id.device < 0 ? 0 : id.device + 1;
1388 list_for_each(p, &snd_timer_list) {
1389 timer = list_entry(p, struct snd_timer, device_list);
1390 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1391 snd_timer_user_copy_id(&id, timer);
1392 break;
1393 }
1394 if (timer->tmr_device >= id.device) {
1395 snd_timer_user_copy_id(&id, timer);
1396 break;
1397 }
1398 }
1399 if (p == &snd_timer_list)
1400 snd_timer_user_zero_id(&id);
1401 break;
1402 case SNDRV_TIMER_CLASS_CARD:
1403 case SNDRV_TIMER_CLASS_PCM:
1404 if (id.card < 0) {
1405 id.card = 0;
1406 } else {
1407 if (id.card < 0) {
1408 id.card = 0;
1409 } else {
1410 if (id.device < 0) {
1411 id.device = 0;
1412 } else {
1413 if (id.subdevice < 0) {
1414 id.subdevice = 0;
1415 } else {
1416 id.subdevice++;
1417 }
1418 }
1419 }
1420 }
1421 list_for_each(p, &snd_timer_list) {
1422 timer = list_entry(p, struct snd_timer, device_list);
1423 if (timer->tmr_class > id.dev_class) {
1424 snd_timer_user_copy_id(&id, timer);
1425 break;
1426 }
1427 if (timer->tmr_class < id.dev_class)
1428 continue;
1429 if (timer->card->number > id.card) {
1430 snd_timer_user_copy_id(&id, timer);
1431 break;
1432 }
1433 if (timer->card->number < id.card)
1434 continue;
1435 if (timer->tmr_device > id.device) {
1436 snd_timer_user_copy_id(&id, timer);
1437 break;
1438 }
1439 if (timer->tmr_device < id.device)
1440 continue;
1441 if (timer->tmr_subdevice > id.subdevice) {
1442 snd_timer_user_copy_id(&id, timer);
1443 break;
1444 }
1445 if (timer->tmr_subdevice < id.subdevice)
1446 continue;
1447 snd_timer_user_copy_id(&id, timer);
1448 break;
1449 }
1450 if (p == &snd_timer_list)
1451 snd_timer_user_zero_id(&id);
1452 break;
1453 default:
1454 snd_timer_user_zero_id(&id);
1455 }
1456 }
1457 mutex_unlock(&register_mutex);
1458 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1459 return -EFAULT;
1460 return 0;
1461 }
1462
1463 static int snd_timer_user_ginfo(struct file *file,
1464 struct snd_timer_ginfo __user *_ginfo)
1465 {
1466 struct snd_timer_ginfo *ginfo;
1467 struct snd_timer_id tid;
1468 struct snd_timer *t;
1469 struct list_head *p;
1470 int err = 0;
1471
1472 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1473 if (IS_ERR(ginfo))
1474 return PTR_ERR(ginfo);
1475
1476 tid = ginfo->tid;
1477 memset(ginfo, 0, sizeof(*ginfo));
1478 ginfo->tid = tid;
1479 mutex_lock(&register_mutex);
1480 t = snd_timer_find(&tid);
1481 if (t != NULL) {
1482 ginfo->card = t->card ? t->card->number : -1;
1483 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1484 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1485 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1486 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1487 ginfo->resolution = t->hw.resolution;
1488 if (t->hw.resolution_min > 0) {
1489 ginfo->resolution_min = t->hw.resolution_min;
1490 ginfo->resolution_max = t->hw.resolution_max;
1491 }
1492 list_for_each(p, &t->open_list_head) {
1493 ginfo->clients++;
1494 }
1495 } else {
1496 err = -ENODEV;
1497 }
1498 mutex_unlock(&register_mutex);
1499 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1500 err = -EFAULT;
1501 kfree(ginfo);
1502 return err;
1503 }
1504
1505 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1506 {
1507 struct snd_timer *t;
1508 int err;
1509
1510 mutex_lock(&register_mutex);
1511 t = snd_timer_find(&gparams->tid);
1512 if (!t) {
1513 err = -ENODEV;
1514 goto _error;
1515 }
1516 if (!list_empty(&t->open_list_head)) {
1517 err = -EBUSY;
1518 goto _error;
1519 }
1520 if (!t->hw.set_period) {
1521 err = -ENOSYS;
1522 goto _error;
1523 }
1524 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1525 _error:
1526 mutex_unlock(&register_mutex);
1527 return err;
1528 }
1529
1530 static int snd_timer_user_gparams(struct file *file,
1531 struct snd_timer_gparams __user *_gparams)
1532 {
1533 struct snd_timer_gparams gparams;
1534
1535 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1536 return -EFAULT;
1537 return timer_set_gparams(&gparams);
1538 }
1539
1540 static int snd_timer_user_gstatus(struct file *file,
1541 struct snd_timer_gstatus __user *_gstatus)
1542 {
1543 struct snd_timer_gstatus gstatus;
1544 struct snd_timer_id tid;
1545 struct snd_timer *t;
1546 int err = 0;
1547
1548 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1549 return -EFAULT;
1550 tid = gstatus.tid;
1551 memset(&gstatus, 0, sizeof(gstatus));
1552 gstatus.tid = tid;
1553 mutex_lock(&register_mutex);
1554 t = snd_timer_find(&tid);
1555 if (t != NULL) {
1556 if (t->hw.c_resolution)
1557 gstatus.resolution = t->hw.c_resolution(t);
1558 else
1559 gstatus.resolution = t->hw.resolution;
1560 if (t->hw.precise_resolution) {
1561 t->hw.precise_resolution(t, &gstatus.resolution_num,
1562 &gstatus.resolution_den);
1563 } else {
1564 gstatus.resolution_num = gstatus.resolution;
1565 gstatus.resolution_den = 1000000000uL;
1566 }
1567 } else {
1568 err = -ENODEV;
1569 }
1570 mutex_unlock(&register_mutex);
1571 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1572 err = -EFAULT;
1573 return err;
1574 }
1575
1576 static int snd_timer_user_tselect(struct file *file,
1577 struct snd_timer_select __user *_tselect)
1578 {
1579 struct snd_timer_user *tu;
1580 struct snd_timer_select tselect;
1581 char str[32];
1582 int err = 0;
1583
1584 tu = file->private_data;
1585 if (tu->timeri) {
1586 snd_timer_close(tu->timeri);
1587 tu->timeri = NULL;
1588 }
1589 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1590 err = -EFAULT;
1591 goto __err;
1592 }
1593 sprintf(str, "application %i", current->pid);
1594 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1595 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1596 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1597 if (err < 0)
1598 goto __err;
1599
1600 kfree(tu->queue);
1601 tu->queue = NULL;
1602 kfree(tu->tqueue);
1603 tu->tqueue = NULL;
1604 if (tu->tread) {
1605 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1606 GFP_KERNEL);
1607 if (tu->tqueue == NULL)
1608 err = -ENOMEM;
1609 } else {
1610 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1611 GFP_KERNEL);
1612 if (tu->queue == NULL)
1613 err = -ENOMEM;
1614 }
1615
1616 if (err < 0) {
1617 snd_timer_close(tu->timeri);
1618 tu->timeri = NULL;
1619 } else {
1620 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1621 tu->timeri->callback = tu->tread
1622 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1623 tu->timeri->ccallback = snd_timer_user_ccallback;
1624 tu->timeri->callback_data = (void *)tu;
1625 tu->timeri->disconnect = snd_timer_user_disconnect;
1626 }
1627
1628 __err:
1629 return err;
1630 }
1631
1632 static int snd_timer_user_info(struct file *file,
1633 struct snd_timer_info __user *_info)
1634 {
1635 struct snd_timer_user *tu;
1636 struct snd_timer_info *info;
1637 struct snd_timer *t;
1638 int err = 0;
1639
1640 tu = file->private_data;
1641 if (!tu->timeri)
1642 return -EBADFD;
1643 t = tu->timeri->timer;
1644 if (!t)
1645 return -EBADFD;
1646
1647 info = kzalloc(sizeof(*info), GFP_KERNEL);
1648 if (! info)
1649 return -ENOMEM;
1650 info->card = t->card ? t->card->number : -1;
1651 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1652 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1653 strlcpy(info->id, t->id, sizeof(info->id));
1654 strlcpy(info->name, t->name, sizeof(info->name));
1655 info->resolution = t->hw.resolution;
1656 if (copy_to_user(_info, info, sizeof(*_info)))
1657 err = -EFAULT;
1658 kfree(info);
1659 return err;
1660 }
1661
1662 static int snd_timer_user_params(struct file *file,
1663 struct snd_timer_params __user *_params)
1664 {
1665 struct snd_timer_user *tu;
1666 struct snd_timer_params params;
1667 struct snd_timer *t;
1668 struct snd_timer_read *tr;
1669 struct snd_timer_tread *ttr;
1670 int err;
1671
1672 tu = file->private_data;
1673 if (!tu->timeri)
1674 return -EBADFD;
1675 t = tu->timeri->timer;
1676 if (!t)
1677 return -EBADFD;
1678 if (copy_from_user(&params, _params, sizeof(params)))
1679 return -EFAULT;
1680 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1681 err = -EINVAL;
1682 goto _end;
1683 }
1684 if (params.queue_size > 0 &&
1685 (params.queue_size < 32 || params.queue_size > 1024)) {
1686 err = -EINVAL;
1687 goto _end;
1688 }
1689 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1690 (1<<SNDRV_TIMER_EVENT_TICK)|
1691 (1<<SNDRV_TIMER_EVENT_START)|
1692 (1<<SNDRV_TIMER_EVENT_STOP)|
1693 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1694 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1695 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1696 (1<<SNDRV_TIMER_EVENT_RESUME)|
1697 (1<<SNDRV_TIMER_EVENT_MSTART)|
1698 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1699 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1700 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1701 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1702 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1703 err = -EINVAL;
1704 goto _end;
1705 }
1706 snd_timer_stop(tu->timeri);
1707 spin_lock_irq(&t->lock);
1708 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1709 SNDRV_TIMER_IFLG_EXCLUSIVE|
1710 SNDRV_TIMER_IFLG_EARLY_EVENT);
1711 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1712 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1713 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1714 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1715 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1716 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1717 spin_unlock_irq(&t->lock);
1718 if (params.queue_size > 0 &&
1719 (unsigned int)tu->queue_size != params.queue_size) {
1720 if (tu->tread) {
1721 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1722 GFP_KERNEL);
1723 if (ttr) {
1724 kfree(tu->tqueue);
1725 tu->queue_size = params.queue_size;
1726 tu->tqueue = ttr;
1727 }
1728 } else {
1729 tr = kmalloc(params.queue_size * sizeof(*tr),
1730 GFP_KERNEL);
1731 if (tr) {
1732 kfree(tu->queue);
1733 tu->queue_size = params.queue_size;
1734 tu->queue = tr;
1735 }
1736 }
1737 }
1738 tu->qhead = tu->qtail = tu->qused = 0;
1739 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1740 if (tu->tread) {
1741 struct snd_timer_tread tread;
1742 memset(&tread, 0, sizeof(tread));
1743 tread.event = SNDRV_TIMER_EVENT_EARLY;
1744 tread.tstamp.tv_sec = 0;
1745 tread.tstamp.tv_nsec = 0;
1746 tread.val = 0;
1747 snd_timer_user_append_to_tqueue(tu, &tread);
1748 } else {
1749 struct snd_timer_read *r = &tu->queue[0];
1750 r->resolution = 0;
1751 r->ticks = 0;
1752 tu->qused++;
1753 tu->qtail++;
1754 }
1755 }
1756 tu->filter = params.filter;
1757 tu->ticks = params.ticks;
1758 err = 0;
1759 _end:
1760 if (copy_to_user(_params, &params, sizeof(params)))
1761 return -EFAULT;
1762 return err;
1763 }
1764
1765 static int snd_timer_user_status(struct file *file,
1766 struct snd_timer_status __user *_status)
1767 {
1768 struct snd_timer_user *tu;
1769 struct snd_timer_status status;
1770
1771 tu = file->private_data;
1772 if (!tu->timeri)
1773 return -EBADFD;
1774 memset(&status, 0, sizeof(status));
1775 status.tstamp = tu->tstamp;
1776 status.resolution = snd_timer_resolution(tu->timeri);
1777 status.lost = tu->timeri->lost;
1778 status.overrun = tu->overrun;
1779 spin_lock_irq(&tu->qlock);
1780 status.queue = tu->qused;
1781 spin_unlock_irq(&tu->qlock);
1782 if (copy_to_user(_status, &status, sizeof(status)))
1783 return -EFAULT;
1784 return 0;
1785 }
1786
1787 static int snd_timer_user_start(struct file *file)
1788 {
1789 int err;
1790 struct snd_timer_user *tu;
1791
1792 tu = file->private_data;
1793 if (!tu->timeri)
1794 return -EBADFD;
1795 snd_timer_stop(tu->timeri);
1796 tu->timeri->lost = 0;
1797 tu->last_resolution = 0;
1798 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1799 }
1800
1801 static int snd_timer_user_stop(struct file *file)
1802 {
1803 int err;
1804 struct snd_timer_user *tu;
1805
1806 tu = file->private_data;
1807 if (!tu->timeri)
1808 return -EBADFD;
1809 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1810 }
1811
1812 static int snd_timer_user_continue(struct file *file)
1813 {
1814 int err;
1815 struct snd_timer_user *tu;
1816
1817 tu = file->private_data;
1818 if (!tu->timeri)
1819 return -EBADFD;
1820 tu->timeri->lost = 0;
1821 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1822 }
1823
1824 static int snd_timer_user_pause(struct file *file)
1825 {
1826 int err;
1827 struct snd_timer_user *tu;
1828
1829 tu = file->private_data;
1830 if (!tu->timeri)
1831 return -EBADFD;
1832 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1833 }
1834
1835 enum {
1836 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1837 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1838 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1839 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1840 };
1841
1842 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1843 unsigned long arg)
1844 {
1845 struct snd_timer_user *tu;
1846 void __user *argp = (void __user *)arg;
1847 int __user *p = argp;
1848
1849 tu = file->private_data;
1850 switch (cmd) {
1851 case SNDRV_TIMER_IOCTL_PVERSION:
1852 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1853 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1854 return snd_timer_user_next_device(argp);
1855 case SNDRV_TIMER_IOCTL_TREAD:
1856 {
1857 int xarg;
1858
1859 if (tu->timeri) /* too late */
1860 return -EBUSY;
1861 if (get_user(xarg, p))
1862 return -EFAULT;
1863 tu->tread = xarg ? 1 : 0;
1864 return 0;
1865 }
1866 case SNDRV_TIMER_IOCTL_GINFO:
1867 return snd_timer_user_ginfo(file, argp);
1868 case SNDRV_TIMER_IOCTL_GPARAMS:
1869 return snd_timer_user_gparams(file, argp);
1870 case SNDRV_TIMER_IOCTL_GSTATUS:
1871 return snd_timer_user_gstatus(file, argp);
1872 case SNDRV_TIMER_IOCTL_SELECT:
1873 return snd_timer_user_tselect(file, argp);
1874 case SNDRV_TIMER_IOCTL_INFO:
1875 return snd_timer_user_info(file, argp);
1876 case SNDRV_TIMER_IOCTL_PARAMS:
1877 return snd_timer_user_params(file, argp);
1878 case SNDRV_TIMER_IOCTL_STATUS:
1879 return snd_timer_user_status(file, argp);
1880 case SNDRV_TIMER_IOCTL_START:
1881 case SNDRV_TIMER_IOCTL_START_OLD:
1882 return snd_timer_user_start(file);
1883 case SNDRV_TIMER_IOCTL_STOP:
1884 case SNDRV_TIMER_IOCTL_STOP_OLD:
1885 return snd_timer_user_stop(file);
1886 case SNDRV_TIMER_IOCTL_CONTINUE:
1887 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1888 return snd_timer_user_continue(file);
1889 case SNDRV_TIMER_IOCTL_PAUSE:
1890 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1891 return snd_timer_user_pause(file);
1892 }
1893 return -ENOTTY;
1894 }
1895
1896 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1897 unsigned long arg)
1898 {
1899 struct snd_timer_user *tu = file->private_data;
1900 long ret;
1901
1902 mutex_lock(&tu->ioctl_lock);
1903 ret = __snd_timer_user_ioctl(file, cmd, arg);
1904 mutex_unlock(&tu->ioctl_lock);
1905 return ret;
1906 }
1907
1908 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1909 {
1910 struct snd_timer_user *tu;
1911
1912 tu = file->private_data;
1913 return fasync_helper(fd, file, on, &tu->fasync);
1914 }
1915
1916 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1917 size_t count, loff_t *offset)
1918 {
1919 struct snd_timer_user *tu;
1920 long result = 0, unit;
1921 int qhead;
1922 int err = 0;
1923
1924 tu = file->private_data;
1925 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1926 spin_lock_irq(&tu->qlock);
1927 while ((long)count - result >= unit) {
1928 while (!tu->qused) {
1929 wait_queue_t wait;
1930
1931 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1932 err = -EAGAIN;
1933 goto _error;
1934 }
1935
1936 set_current_state(TASK_INTERRUPTIBLE);
1937 init_waitqueue_entry(&wait, current);
1938 add_wait_queue(&tu->qchange_sleep, &wait);
1939
1940 spin_unlock_irq(&tu->qlock);
1941 schedule();
1942 spin_lock_irq(&tu->qlock);
1943
1944 remove_wait_queue(&tu->qchange_sleep, &wait);
1945
1946 if (tu->disconnected) {
1947 err = -ENODEV;
1948 goto _error;
1949 }
1950 if (signal_pending(current)) {
1951 err = -ERESTARTSYS;
1952 goto _error;
1953 }
1954 }
1955
1956 qhead = tu->qhead++;
1957 tu->qhead %= tu->queue_size;
1958 tu->qused--;
1959 spin_unlock_irq(&tu->qlock);
1960
1961 if (tu->tread) {
1962 if (copy_to_user(buffer, &tu->tqueue[qhead],
1963 sizeof(struct snd_timer_tread)))
1964 err = -EFAULT;
1965 } else {
1966 if (copy_to_user(buffer, &tu->queue[qhead],
1967 sizeof(struct snd_timer_read)))
1968 err = -EFAULT;
1969 }
1970
1971 spin_lock_irq(&tu->qlock);
1972 if (err < 0)
1973 goto _error;
1974 result += unit;
1975 buffer += unit;
1976 }
1977 _error:
1978 spin_unlock_irq(&tu->qlock);
1979 return result > 0 ? result : err;
1980 }
1981
1982 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1983 {
1984 unsigned int mask;
1985 struct snd_timer_user *tu;
1986
1987 tu = file->private_data;
1988
1989 poll_wait(file, &tu->qchange_sleep, wait);
1990
1991 mask = 0;
1992 if (tu->qused)
1993 mask |= POLLIN | POLLRDNORM;
1994 if (tu->disconnected)
1995 mask |= POLLERR;
1996
1997 return mask;
1998 }
1999
2000 #ifdef CONFIG_COMPAT
2001 #include "timer_compat.c"
2002 #else
2003 #define snd_timer_user_ioctl_compat NULL
2004 #endif
2005
2006 static const struct file_operations snd_timer_f_ops =
2007 {
2008 .owner = THIS_MODULE,
2009 .read = snd_timer_user_read,
2010 .open = snd_timer_user_open,
2011 .release = snd_timer_user_release,
2012 .llseek = no_llseek,
2013 .poll = snd_timer_user_poll,
2014 .unlocked_ioctl = snd_timer_user_ioctl,
2015 .compat_ioctl = snd_timer_user_ioctl_compat,
2016 .fasync = snd_timer_user_fasync,
2017 };
2018
2019 /* unregister the system timer */
2020 static void snd_timer_free_all(void)
2021 {
2022 struct snd_timer *timer, *n;
2023
2024 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2025 snd_timer_free(timer);
2026 }
2027
2028 static struct device timer_dev;
2029
2030 /*
2031 * ENTRY functions
2032 */
2033
2034 static int __init alsa_timer_init(void)
2035 {
2036 int err;
2037
2038 snd_device_initialize(&timer_dev, NULL);
2039 dev_set_name(&timer_dev, "timer");
2040
2041 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2042 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2043 "system timer");
2044 #endif
2045
2046 err = snd_timer_register_system();
2047 if (err < 0) {
2048 pr_err("ALSA: unable to register system timer (%i)\n", err);
2049 put_device(&timer_dev);
2050 return err;
2051 }
2052
2053 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2054 &snd_timer_f_ops, NULL, &timer_dev);
2055 if (err < 0) {
2056 pr_err("ALSA: unable to register timer device (%i)\n", err);
2057 snd_timer_free_all();
2058 put_device(&timer_dev);
2059 return err;
2060 }
2061
2062 snd_timer_proc_init();
2063 return 0;
2064 }
2065
2066 static void __exit alsa_timer_exit(void)
2067 {
2068 snd_unregister_device(&timer_dev);
2069 snd_timer_free_all();
2070 put_device(&timer_dev);
2071 snd_timer_proc_done();
2072 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2073 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2074 #endif
2075 }
2076
2077 module_init(alsa_timer_init)
2078 module_exit(alsa_timer_exit)
2079
2080 EXPORT_SYMBOL(snd_timer_open);
2081 EXPORT_SYMBOL(snd_timer_close);
2082 EXPORT_SYMBOL(snd_timer_resolution);
2083 EXPORT_SYMBOL(snd_timer_start);
2084 EXPORT_SYMBOL(snd_timer_stop);
2085 EXPORT_SYMBOL(snd_timer_continue);
2086 EXPORT_SYMBOL(snd_timer_pause);
2087 EXPORT_SYMBOL(snd_timer_new);
2088 EXPORT_SYMBOL(snd_timer_notify);
2089 EXPORT_SYMBOL(snd_timer_global_new);
2090 EXPORT_SYMBOL(snd_timer_global_free);
2091 EXPORT_SYMBOL(snd_timer_global_register);
2092 EXPORT_SYMBOL(snd_timer_interrupt);
Linux kernel - Deliverables
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