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