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Merge tag 'v3.10.97' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.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 defined(CONFIG_SND_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE)
39 #define DEFAULT_TIMER_LIMIT 4
40 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
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 struct snd_timer_read *queue;
69 struct snd_timer_tread *tqueue;
70 spinlock_t qlock;
71 unsigned long last_resolution;
72 unsigned int filter;
73 struct timespec tstamp; /* trigger tstamp */
74 wait_queue_head_t qchange_sleep;
75 struct fasync_struct *fasync;
76 struct mutex ioctl_lock;
77 };
78
79 /* list of timers */
80 static LIST_HEAD(snd_timer_list);
81
82 /* list of slave instances */
83 static LIST_HEAD(snd_timer_slave_list);
84
85 /* lock for slave active lists */
86 static DEFINE_SPINLOCK(slave_active_lock);
87
88 static DEFINE_MUTEX(register_mutex);
89
90 static int snd_timer_free(struct snd_timer *timer);
91 static int snd_timer_dev_free(struct snd_device *device);
92 static int snd_timer_dev_register(struct snd_device *device);
93 static int snd_timer_dev_disconnect(struct snd_device *device);
94
95 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
96
97 /*
98 * create a timer instance with the given owner string.
99 * when timer is not NULL, increments the module counter
100 */
101 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
102 struct snd_timer *timer)
103 {
104 struct snd_timer_instance *timeri;
105 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
106 if (timeri == NULL)
107 return NULL;
108 timeri->owner = kstrdup(owner, GFP_KERNEL);
109 if (! timeri->owner) {
110 kfree(timeri);
111 return NULL;
112 }
113 INIT_LIST_HEAD(&timeri->open_list);
114 INIT_LIST_HEAD(&timeri->active_list);
115 INIT_LIST_HEAD(&timeri->ack_list);
116 INIT_LIST_HEAD(&timeri->slave_list_head);
117 INIT_LIST_HEAD(&timeri->slave_active_head);
118
119 timeri->timer = timer;
120 if (timer && !try_module_get(timer->module)) {
121 kfree(timeri->owner);
122 kfree(timeri);
123 return NULL;
124 }
125
126 return timeri;
127 }
128
129 /*
130 * find a timer instance from the given timer id
131 */
132 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
133 {
134 struct snd_timer *timer = NULL;
135
136 list_for_each_entry(timer, &snd_timer_list, device_list) {
137 if (timer->tmr_class != tid->dev_class)
138 continue;
139 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
140 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
141 (timer->card == NULL ||
142 timer->card->number != tid->card))
143 continue;
144 if (timer->tmr_device != tid->device)
145 continue;
146 if (timer->tmr_subdevice != tid->subdevice)
147 continue;
148 return timer;
149 }
150 return NULL;
151 }
152
153 #ifdef CONFIG_MODULES
154
155 static void snd_timer_request(struct snd_timer_id *tid)
156 {
157 switch (tid->dev_class) {
158 case SNDRV_TIMER_CLASS_GLOBAL:
159 if (tid->device < timer_limit)
160 request_module("snd-timer-%i", tid->device);
161 break;
162 case SNDRV_TIMER_CLASS_CARD:
163 case SNDRV_TIMER_CLASS_PCM:
164 if (tid->card < snd_ecards_limit)
165 request_module("snd-card-%i", tid->card);
166 break;
167 default:
168 break;
169 }
170 }
171
172 #endif
173
174 /*
175 * look for a master instance matching with the slave id of the given slave.
176 * when found, relink the open_link of the slave.
177 *
178 * call this with register_mutex down.
179 */
180 static void snd_timer_check_slave(struct snd_timer_instance *slave)
181 {
182 struct snd_timer *timer;
183 struct snd_timer_instance *master;
184
185 /* FIXME: it's really dumb to look up all entries.. */
186 list_for_each_entry(timer, &snd_timer_list, device_list) {
187 list_for_each_entry(master, &timer->open_list_head, open_list) {
188 if (slave->slave_class == master->slave_class &&
189 slave->slave_id == master->slave_id) {
190 list_move_tail(&slave->open_list,
191 &master->slave_list_head);
192 spin_lock_irq(&slave_active_lock);
193 slave->master = master;
194 slave->timer = master->timer;
195 spin_unlock_irq(&slave_active_lock);
196 return;
197 }
198 }
199 }
200 }
201
202 /*
203 * look for slave instances matching with the slave id of the given master.
204 * when found, relink the open_link of slaves.
205 *
206 * call this with register_mutex down.
207 */
208 static void snd_timer_check_master(struct snd_timer_instance *master)
209 {
210 struct snd_timer_instance *slave, *tmp;
211
212 /* check all pending slaves */
213 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
214 if (slave->slave_class == master->slave_class &&
215 slave->slave_id == master->slave_id) {
216 list_move_tail(&slave->open_list, &master->slave_list_head);
217 spin_lock_irq(&slave_active_lock);
218 spin_lock(&master->timer->lock);
219 slave->master = master;
220 slave->timer = master->timer;
221 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
222 list_add_tail(&slave->active_list,
223 &master->slave_active_head);
224 spin_unlock(&master->timer->lock);
225 spin_unlock_irq(&slave_active_lock);
226 }
227 }
228 }
229
230 /*
231 * open a timer instance
232 * when opening a master, the slave id must be here given.
233 */
234 int snd_timer_open(struct snd_timer_instance **ti,
235 char *owner, struct snd_timer_id *tid,
236 unsigned int slave_id)
237 {
238 struct snd_timer *timer;
239 struct snd_timer_instance *timeri = NULL;
240
241 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
242 /* open a slave instance */
243 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
244 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
245 snd_printd("invalid slave class %i\n", 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 timeri->slave_class = tid->dev_sclass;
293 timeri->slave_id = slave_id;
294 if (list_empty(&timer->open_list_head) && timer->hw.open)
295 timer->hw.open(timer);
296 list_add_tail(&timeri->open_list, &timer->open_list_head);
297 snd_timer_check_master(timeri);
298 mutex_unlock(&register_mutex);
299 *ti = timeri;
300 return 0;
301 }
302
303 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event);
304
305 /*
306 * close a timer instance
307 */
308 int snd_timer_close(struct snd_timer_instance *timeri)
309 {
310 struct snd_timer *timer = NULL;
311 struct snd_timer_instance *slave, *tmp;
312
313 if (snd_BUG_ON(!timeri))
314 return -ENXIO;
315
316 /* force to stop the timer */
317 snd_timer_stop(timeri);
318
319 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
320 /* wait, until the active callback is finished */
321 spin_lock_irq(&slave_active_lock);
322 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
323 spin_unlock_irq(&slave_active_lock);
324 udelay(10);
325 spin_lock_irq(&slave_active_lock);
326 }
327 spin_unlock_irq(&slave_active_lock);
328 mutex_lock(&register_mutex);
329 list_del(&timeri->open_list);
330 mutex_unlock(&register_mutex);
331 } else {
332 timer = timeri->timer;
333 if (snd_BUG_ON(!timer))
334 goto out;
335 /* wait, until the active callback is finished */
336 spin_lock_irq(&timer->lock);
337 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
338 spin_unlock_irq(&timer->lock);
339 udelay(10);
340 spin_lock_irq(&timer->lock);
341 }
342 spin_unlock_irq(&timer->lock);
343 mutex_lock(&register_mutex);
344 list_del(&timeri->open_list);
345 if (list_empty(&timer->open_list_head) &&
346 timer->hw.close)
347 timer->hw.close(timer);
348 /* remove slave links */
349 spin_lock_irq(&slave_active_lock);
350 spin_lock(&timer->lock);
351 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
352 open_list) {
353 list_move_tail(&slave->open_list, &snd_timer_slave_list);
354 slave->master = NULL;
355 slave->timer = NULL;
356 list_del_init(&slave->ack_list);
357 list_del_init(&slave->active_list);
358 }
359 spin_unlock(&timer->lock);
360 spin_unlock_irq(&slave_active_lock);
361 mutex_unlock(&register_mutex);
362 }
363 out:
364 if (timeri->private_free)
365 timeri->private_free(timeri);
366 kfree(timeri->owner);
367 kfree(timeri);
368 if (timer)
369 module_put(timer->module);
370 return 0;
371 }
372
373 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
374 {
375 struct snd_timer * timer;
376
377 if (timeri == NULL)
378 return 0;
379 if ((timer = timeri->timer) != NULL) {
380 if (timer->hw.c_resolution)
381 return timer->hw.c_resolution(timer);
382 return timer->hw.resolution;
383 }
384 return 0;
385 }
386
387 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
388 {
389 struct snd_timer *timer;
390 unsigned long flags;
391 unsigned long resolution = 0;
392 struct snd_timer_instance *ts;
393 struct timespec tstamp;
394
395 if (timer_tstamp_monotonic)
396 do_posix_clock_monotonic_gettime(&tstamp);
397 else
398 getnstimeofday(&tstamp);
399 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
400 event > SNDRV_TIMER_EVENT_PAUSE))
401 return;
402 if (event == SNDRV_TIMER_EVENT_START ||
403 event == SNDRV_TIMER_EVENT_CONTINUE)
404 resolution = snd_timer_resolution(ti);
405 if (ti->ccallback)
406 ti->ccallback(ti, event, &tstamp, resolution);
407 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
408 return;
409 timer = ti->timer;
410 if (timer == NULL)
411 return;
412 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
413 return;
414 spin_lock_irqsave(&timer->lock, flags);
415 list_for_each_entry(ts, &ti->slave_active_head, active_list)
416 if (ts->ccallback)
417 ts->ccallback(ts, event + 100, &tstamp, resolution);
418 spin_unlock_irqrestore(&timer->lock, flags);
419 }
420
421 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
422 unsigned long sticks)
423 {
424 list_move_tail(&timeri->active_list, &timer->active_list_head);
425 if (timer->running) {
426 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
427 goto __start_now;
428 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
429 timeri->flags |= SNDRV_TIMER_IFLG_START;
430 return 1; /* delayed start */
431 } else {
432 timer->sticks = sticks;
433 timer->hw.start(timer);
434 __start_now:
435 timer->running++;
436 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
437 return 0;
438 }
439 }
440
441 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
442 {
443 unsigned long flags;
444
445 spin_lock_irqsave(&slave_active_lock, flags);
446 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
447 spin_unlock_irqrestore(&slave_active_lock, flags);
448 return -EBUSY;
449 }
450 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
451 if (timeri->master && timeri->timer) {
452 spin_lock(&timeri->timer->lock);
453 list_add_tail(&timeri->active_list,
454 &timeri->master->slave_active_head);
455 spin_unlock(&timeri->timer->lock);
456 }
457 spin_unlock_irqrestore(&slave_active_lock, flags);
458 return 1; /* delayed start */
459 }
460
461 /*
462 * start the timer instance
463 */
464 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
465 {
466 struct snd_timer *timer;
467 int result = -EINVAL;
468 unsigned long flags;
469
470 if (timeri == NULL || ticks < 1)
471 return -EINVAL;
472 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
473 result = snd_timer_start_slave(timeri);
474 if (result >= 0)
475 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
476 return result;
477 }
478 timer = timeri->timer;
479 if (timer == NULL)
480 return -EINVAL;
481 spin_lock_irqsave(&timer->lock, flags);
482 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
483 SNDRV_TIMER_IFLG_START)) {
484 result = -EBUSY;
485 goto unlock;
486 }
487 timeri->ticks = timeri->cticks = ticks;
488 timeri->pticks = 0;
489 result = snd_timer_start1(timer, timeri, ticks);
490 unlock:
491 spin_unlock_irqrestore(&timer->lock, flags);
492 if (result >= 0)
493 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
494 return result;
495 }
496
497 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event)
498 {
499 struct snd_timer *timer;
500 unsigned long flags;
501
502 if (snd_BUG_ON(!timeri))
503 return -ENXIO;
504
505 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
506 spin_lock_irqsave(&slave_active_lock, flags);
507 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
508 spin_unlock_irqrestore(&slave_active_lock, flags);
509 return -EBUSY;
510 }
511 if (timeri->timer)
512 spin_lock(&timeri->timer->lock);
513 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
514 list_del_init(&timeri->ack_list);
515 list_del_init(&timeri->active_list);
516 if (timeri->timer)
517 spin_unlock(&timeri->timer->lock);
518 spin_unlock_irqrestore(&slave_active_lock, flags);
519 goto __end;
520 }
521 timer = timeri->timer;
522 if (!timer)
523 return -EINVAL;
524 spin_lock_irqsave(&timer->lock, flags);
525 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
526 SNDRV_TIMER_IFLG_START))) {
527 spin_unlock_irqrestore(&timer->lock, flags);
528 return -EBUSY;
529 }
530 list_del_init(&timeri->ack_list);
531 list_del_init(&timeri->active_list);
532 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
533 !(--timer->running)) {
534 timer->hw.stop(timer);
535 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
536 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
537 snd_timer_reschedule(timer, 0);
538 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
539 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
540 timer->hw.start(timer);
541 }
542 }
543 }
544 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
545 spin_unlock_irqrestore(&timer->lock, flags);
546 __end:
547 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
548 snd_timer_notify1(timeri, event);
549 return 0;
550 }
551
552 /*
553 * stop the timer instance.
554 *
555 * do not call this from the timer callback!
556 */
557 int snd_timer_stop(struct snd_timer_instance *timeri)
558 {
559 struct snd_timer *timer;
560 unsigned long flags;
561 int err;
562
563 err = _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_STOP);
564 if (err < 0)
565 return err;
566 timer = timeri->timer;
567 if (!timer)
568 return -EINVAL;
569 spin_lock_irqsave(&timer->lock, flags);
570 timeri->cticks = timeri->ticks;
571 timeri->pticks = 0;
572 spin_unlock_irqrestore(&timer->lock, flags);
573 return 0;
574 }
575
576 /*
577 * start again.. the tick is kept.
578 */
579 int snd_timer_continue(struct snd_timer_instance *timeri)
580 {
581 struct snd_timer *timer;
582 int result = -EINVAL;
583 unsigned long flags;
584
585 if (timeri == NULL)
586 return result;
587 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
588 return snd_timer_start_slave(timeri);
589 timer = timeri->timer;
590 if (! timer)
591 return -EINVAL;
592 spin_lock_irqsave(&timer->lock, flags);
593 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
594 result = -EBUSY;
595 goto unlock;
596 }
597 if (!timeri->cticks)
598 timeri->cticks = 1;
599 timeri->pticks = 0;
600 result = snd_timer_start1(timer, timeri, timer->sticks);
601 unlock:
602 spin_unlock_irqrestore(&timer->lock, flags);
603 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
604 return result;
605 }
606
607 /*
608 * pause.. remember the ticks left
609 */
610 int snd_timer_pause(struct snd_timer_instance * timeri)
611 {
612 return _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_PAUSE);
613 }
614
615 /*
616 * reschedule the timer
617 *
618 * start pending instances and check the scheduling ticks.
619 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
620 */
621 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
622 {
623 struct snd_timer_instance *ti;
624 unsigned long ticks = ~0UL;
625
626 list_for_each_entry(ti, &timer->active_list_head, active_list) {
627 if (ti->flags & SNDRV_TIMER_IFLG_START) {
628 ti->flags &= ~SNDRV_TIMER_IFLG_START;
629 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
630 timer->running++;
631 }
632 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
633 if (ticks > ti->cticks)
634 ticks = ti->cticks;
635 }
636 }
637 if (ticks == ~0UL) {
638 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
639 return;
640 }
641 if (ticks > timer->hw.ticks)
642 ticks = timer->hw.ticks;
643 if (ticks_left != ticks)
644 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
645 timer->sticks = ticks;
646 }
647
648 /*
649 * timer tasklet
650 *
651 */
652 static void snd_timer_tasklet(unsigned long arg)
653 {
654 struct snd_timer *timer = (struct snd_timer *) arg;
655 struct snd_timer_instance *ti;
656 struct list_head *p;
657 unsigned long resolution, ticks;
658 unsigned long flags;
659
660 spin_lock_irqsave(&timer->lock, flags);
661 /* now process all callbacks */
662 while (!list_empty(&timer->sack_list_head)) {
663 p = timer->sack_list_head.next; /* get first item */
664 ti = list_entry(p, struct snd_timer_instance, ack_list);
665
666 /* remove from ack_list and make empty */
667 list_del_init(p);
668
669 ticks = ti->pticks;
670 ti->pticks = 0;
671 resolution = ti->resolution;
672
673 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
674 spin_unlock(&timer->lock);
675 if (ti->callback)
676 ti->callback(ti, resolution, ticks);
677 spin_lock(&timer->lock);
678 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
679 }
680 spin_unlock_irqrestore(&timer->lock, flags);
681 }
682
683 /*
684 * timer interrupt
685 *
686 * ticks_left is usually equal to timer->sticks.
687 *
688 */
689 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
690 {
691 struct snd_timer_instance *ti, *ts, *tmp;
692 unsigned long resolution, ticks;
693 struct list_head *p, *ack_list_head;
694 unsigned long flags;
695 int use_tasklet = 0;
696
697 if (timer == NULL)
698 return;
699
700 spin_lock_irqsave(&timer->lock, flags);
701
702 /* remember the current resolution */
703 if (timer->hw.c_resolution)
704 resolution = timer->hw.c_resolution(timer);
705 else
706 resolution = timer->hw.resolution;
707
708 /* loop for all active instances
709 * Here we cannot use list_for_each_entry because the active_list of a
710 * processed instance is relinked to done_list_head before the callback
711 * is called.
712 */
713 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
714 active_list) {
715 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
716 continue;
717 ti->pticks += ticks_left;
718 ti->resolution = resolution;
719 if (ti->cticks < ticks_left)
720 ti->cticks = 0;
721 else
722 ti->cticks -= ticks_left;
723 if (ti->cticks) /* not expired */
724 continue;
725 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
726 ti->cticks = ti->ticks;
727 } else {
728 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
729 --timer->running;
730 list_del_init(&ti->active_list);
731 }
732 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
733 (ti->flags & SNDRV_TIMER_IFLG_FAST))
734 ack_list_head = &timer->ack_list_head;
735 else
736 ack_list_head = &timer->sack_list_head;
737 if (list_empty(&ti->ack_list))
738 list_add_tail(&ti->ack_list, ack_list_head);
739 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
740 ts->pticks = ti->pticks;
741 ts->resolution = resolution;
742 if (list_empty(&ts->ack_list))
743 list_add_tail(&ts->ack_list, ack_list_head);
744 }
745 }
746 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
747 snd_timer_reschedule(timer, timer->sticks);
748 if (timer->running) {
749 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
750 timer->hw.stop(timer);
751 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
752 }
753 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
754 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
755 /* restart timer */
756 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
757 timer->hw.start(timer);
758 }
759 } else {
760 timer->hw.stop(timer);
761 }
762
763 /* now process all fast callbacks */
764 while (!list_empty(&timer->ack_list_head)) {
765 p = timer->ack_list_head.next; /* get first item */
766 ti = list_entry(p, struct snd_timer_instance, ack_list);
767
768 /* remove from ack_list and make empty */
769 list_del_init(p);
770
771 ticks = ti->pticks;
772 ti->pticks = 0;
773
774 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
775 spin_unlock(&timer->lock);
776 if (ti->callback)
777 ti->callback(ti, resolution, ticks);
778 spin_lock(&timer->lock);
779 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
780 }
781
782 /* do we have any slow callbacks? */
783 use_tasklet = !list_empty(&timer->sack_list_head);
784 spin_unlock_irqrestore(&timer->lock, flags);
785
786 if (use_tasklet)
787 tasklet_schedule(&timer->task_queue);
788 }
789
790 /*
791
792 */
793
794 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
795 struct snd_timer **rtimer)
796 {
797 struct snd_timer *timer;
798 int err;
799 static struct snd_device_ops ops = {
800 .dev_free = snd_timer_dev_free,
801 .dev_register = snd_timer_dev_register,
802 .dev_disconnect = snd_timer_dev_disconnect,
803 };
804
805 if (snd_BUG_ON(!tid))
806 return -EINVAL;
807 if (rtimer)
808 *rtimer = NULL;
809 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
810 if (timer == NULL) {
811 snd_printk(KERN_ERR "timer: cannot allocate\n");
812 return -ENOMEM;
813 }
814 timer->tmr_class = tid->dev_class;
815 timer->card = card;
816 timer->tmr_device = tid->device;
817 timer->tmr_subdevice = tid->subdevice;
818 if (id)
819 strlcpy(timer->id, id, sizeof(timer->id));
820 INIT_LIST_HEAD(&timer->device_list);
821 INIT_LIST_HEAD(&timer->open_list_head);
822 INIT_LIST_HEAD(&timer->active_list_head);
823 INIT_LIST_HEAD(&timer->ack_list_head);
824 INIT_LIST_HEAD(&timer->sack_list_head);
825 spin_lock_init(&timer->lock);
826 tasklet_init(&timer->task_queue, snd_timer_tasklet,
827 (unsigned long)timer);
828 if (card != NULL) {
829 timer->module = card->module;
830 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
831 if (err < 0) {
832 snd_timer_free(timer);
833 return err;
834 }
835 }
836 if (rtimer)
837 *rtimer = timer;
838 return 0;
839 }
840
841 static int snd_timer_free(struct snd_timer *timer)
842 {
843 if (!timer)
844 return 0;
845
846 mutex_lock(&register_mutex);
847 if (! list_empty(&timer->open_list_head)) {
848 struct list_head *p, *n;
849 struct snd_timer_instance *ti;
850 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
851 list_for_each_safe(p, n, &timer->open_list_head) {
852 list_del_init(p);
853 ti = list_entry(p, struct snd_timer_instance, open_list);
854 ti->timer = NULL;
855 }
856 }
857 list_del(&timer->device_list);
858 mutex_unlock(&register_mutex);
859
860 if (timer->private_free)
861 timer->private_free(timer);
862 kfree(timer);
863 return 0;
864 }
865
866 static int snd_timer_dev_free(struct snd_device *device)
867 {
868 struct snd_timer *timer = device->device_data;
869 return snd_timer_free(timer);
870 }
871
872 static int snd_timer_dev_register(struct snd_device *dev)
873 {
874 struct snd_timer *timer = dev->device_data;
875 struct snd_timer *timer1;
876
877 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
878 return -ENXIO;
879 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
880 !timer->hw.resolution && timer->hw.c_resolution == NULL)
881 return -EINVAL;
882
883 mutex_lock(&register_mutex);
884 list_for_each_entry(timer1, &snd_timer_list, device_list) {
885 if (timer1->tmr_class > timer->tmr_class)
886 break;
887 if (timer1->tmr_class < timer->tmr_class)
888 continue;
889 if (timer1->card && timer->card) {
890 if (timer1->card->number > timer->card->number)
891 break;
892 if (timer1->card->number < timer->card->number)
893 continue;
894 }
895 if (timer1->tmr_device > timer->tmr_device)
896 break;
897 if (timer1->tmr_device < timer->tmr_device)
898 continue;
899 if (timer1->tmr_subdevice > timer->tmr_subdevice)
900 break;
901 if (timer1->tmr_subdevice < timer->tmr_subdevice)
902 continue;
903 /* conflicts.. */
904 mutex_unlock(&register_mutex);
905 return -EBUSY;
906 }
907 list_add_tail(&timer->device_list, &timer1->device_list);
908 mutex_unlock(&register_mutex);
909 return 0;
910 }
911
912 static int snd_timer_dev_disconnect(struct snd_device *device)
913 {
914 struct snd_timer *timer = device->device_data;
915 mutex_lock(&register_mutex);
916 list_del_init(&timer->device_list);
917 mutex_unlock(&register_mutex);
918 return 0;
919 }
920
921 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
922 {
923 unsigned long flags;
924 unsigned long resolution = 0;
925 struct snd_timer_instance *ti, *ts;
926
927 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
928 return;
929 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
930 event > SNDRV_TIMER_EVENT_MRESUME))
931 return;
932 spin_lock_irqsave(&timer->lock, flags);
933 if (event == SNDRV_TIMER_EVENT_MSTART ||
934 event == SNDRV_TIMER_EVENT_MCONTINUE ||
935 event == SNDRV_TIMER_EVENT_MRESUME) {
936 if (timer->hw.c_resolution)
937 resolution = timer->hw.c_resolution(timer);
938 else
939 resolution = timer->hw.resolution;
940 }
941 list_for_each_entry(ti, &timer->active_list_head, active_list) {
942 if (ti->ccallback)
943 ti->ccallback(ti, event, tstamp, resolution);
944 list_for_each_entry(ts, &ti->slave_active_head, active_list)
945 if (ts->ccallback)
946 ts->ccallback(ts, event, tstamp, resolution);
947 }
948 spin_unlock_irqrestore(&timer->lock, flags);
949 }
950
951 /*
952 * exported functions for global timers
953 */
954 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
955 {
956 struct snd_timer_id tid;
957
958 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
959 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
960 tid.card = -1;
961 tid.device = device;
962 tid.subdevice = 0;
963 return snd_timer_new(NULL, id, &tid, rtimer);
964 }
965
966 int snd_timer_global_free(struct snd_timer *timer)
967 {
968 return snd_timer_free(timer);
969 }
970
971 int snd_timer_global_register(struct snd_timer *timer)
972 {
973 struct snd_device dev;
974
975 memset(&dev, 0, sizeof(dev));
976 dev.device_data = timer;
977 return snd_timer_dev_register(&dev);
978 }
979
980 /*
981 * System timer
982 */
983
984 struct snd_timer_system_private {
985 struct timer_list tlist;
986 unsigned long last_expires;
987 unsigned long last_jiffies;
988 unsigned long correction;
989 };
990
991 static void snd_timer_s_function(unsigned long data)
992 {
993 struct snd_timer *timer = (struct snd_timer *)data;
994 struct snd_timer_system_private *priv = timer->private_data;
995 unsigned long jiff = jiffies;
996 if (time_after(jiff, priv->last_expires))
997 priv->correction += (long)jiff - (long)priv->last_expires;
998 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
999 }
1000
1001 static int snd_timer_s_start(struct snd_timer * timer)
1002 {
1003 struct snd_timer_system_private *priv;
1004 unsigned long njiff;
1005
1006 priv = (struct snd_timer_system_private *) timer->private_data;
1007 njiff = (priv->last_jiffies = jiffies);
1008 if (priv->correction > timer->sticks - 1) {
1009 priv->correction -= timer->sticks - 1;
1010 njiff++;
1011 } else {
1012 njiff += timer->sticks - priv->correction;
1013 priv->correction = 0;
1014 }
1015 priv->last_expires = priv->tlist.expires = njiff;
1016 add_timer(&priv->tlist);
1017 return 0;
1018 }
1019
1020 static int snd_timer_s_stop(struct snd_timer * timer)
1021 {
1022 struct snd_timer_system_private *priv;
1023 unsigned long jiff;
1024
1025 priv = (struct snd_timer_system_private *) timer->private_data;
1026 del_timer(&priv->tlist);
1027 jiff = jiffies;
1028 if (time_before(jiff, priv->last_expires))
1029 timer->sticks = priv->last_expires - jiff;
1030 else
1031 timer->sticks = 1;
1032 priv->correction = 0;
1033 return 0;
1034 }
1035
1036 static struct snd_timer_hardware snd_timer_system =
1037 {
1038 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1039 .resolution = 1000000000L / HZ,
1040 .ticks = 10000000L,
1041 .start = snd_timer_s_start,
1042 .stop = snd_timer_s_stop
1043 };
1044
1045 static void snd_timer_free_system(struct snd_timer *timer)
1046 {
1047 kfree(timer->private_data);
1048 }
1049
1050 static int snd_timer_register_system(void)
1051 {
1052 struct snd_timer *timer;
1053 struct snd_timer_system_private *priv;
1054 int err;
1055
1056 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1057 if (err < 0)
1058 return err;
1059 strcpy(timer->name, "system timer");
1060 timer->hw = snd_timer_system;
1061 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1062 if (priv == NULL) {
1063 snd_timer_free(timer);
1064 return -ENOMEM;
1065 }
1066 init_timer(&priv->tlist);
1067 priv->tlist.function = snd_timer_s_function;
1068 priv->tlist.data = (unsigned long) timer;
1069 timer->private_data = priv;
1070 timer->private_free = snd_timer_free_system;
1071 return snd_timer_global_register(timer);
1072 }
1073
1074 #ifdef CONFIG_PROC_FS
1075 /*
1076 * Info interface
1077 */
1078
1079 static void snd_timer_proc_read(struct snd_info_entry *entry,
1080 struct snd_info_buffer *buffer)
1081 {
1082 struct snd_timer *timer;
1083 struct snd_timer_instance *ti;
1084
1085 mutex_lock(&register_mutex);
1086 list_for_each_entry(timer, &snd_timer_list, device_list) {
1087 switch (timer->tmr_class) {
1088 case SNDRV_TIMER_CLASS_GLOBAL:
1089 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1090 break;
1091 case SNDRV_TIMER_CLASS_CARD:
1092 snd_iprintf(buffer, "C%i-%i: ",
1093 timer->card->number, timer->tmr_device);
1094 break;
1095 case SNDRV_TIMER_CLASS_PCM:
1096 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1097 timer->tmr_device, timer->tmr_subdevice);
1098 break;
1099 default:
1100 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1101 timer->card ? timer->card->number : -1,
1102 timer->tmr_device, timer->tmr_subdevice);
1103 }
1104 snd_iprintf(buffer, "%s :", timer->name);
1105 if (timer->hw.resolution)
1106 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1107 timer->hw.resolution / 1000,
1108 timer->hw.resolution % 1000,
1109 timer->hw.ticks);
1110 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1111 snd_iprintf(buffer, " SLAVE");
1112 snd_iprintf(buffer, "\n");
1113 list_for_each_entry(ti, &timer->open_list_head, open_list)
1114 snd_iprintf(buffer, " Client %s : %s\n",
1115 ti->owner ? ti->owner : "unknown",
1116 ti->flags & (SNDRV_TIMER_IFLG_START |
1117 SNDRV_TIMER_IFLG_RUNNING)
1118 ? "running" : "stopped");
1119 }
1120 mutex_unlock(&register_mutex);
1121 }
1122
1123 static struct snd_info_entry *snd_timer_proc_entry;
1124
1125 static void __init snd_timer_proc_init(void)
1126 {
1127 struct snd_info_entry *entry;
1128
1129 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1130 if (entry != NULL) {
1131 entry->c.text.read = snd_timer_proc_read;
1132 if (snd_info_register(entry) < 0) {
1133 snd_info_free_entry(entry);
1134 entry = NULL;
1135 }
1136 }
1137 snd_timer_proc_entry = entry;
1138 }
1139
1140 static void __exit snd_timer_proc_done(void)
1141 {
1142 snd_info_free_entry(snd_timer_proc_entry);
1143 }
1144 #else /* !CONFIG_PROC_FS */
1145 #define snd_timer_proc_init()
1146 #define snd_timer_proc_done()
1147 #endif
1148
1149 /*
1150 * USER SPACE interface
1151 */
1152
1153 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1154 unsigned long resolution,
1155 unsigned long ticks)
1156 {
1157 struct snd_timer_user *tu = timeri->callback_data;
1158 struct snd_timer_read *r;
1159 int prev;
1160
1161 spin_lock(&tu->qlock);
1162 if (tu->qused > 0) {
1163 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1164 r = &tu->queue[prev];
1165 if (r->resolution == resolution) {
1166 r->ticks += ticks;
1167 goto __wake;
1168 }
1169 }
1170 if (tu->qused >= tu->queue_size) {
1171 tu->overrun++;
1172 } else {
1173 r = &tu->queue[tu->qtail++];
1174 tu->qtail %= tu->queue_size;
1175 r->resolution = resolution;
1176 r->ticks = ticks;
1177 tu->qused++;
1178 }
1179 __wake:
1180 spin_unlock(&tu->qlock);
1181 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1182 wake_up(&tu->qchange_sleep);
1183 }
1184
1185 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1186 struct snd_timer_tread *tread)
1187 {
1188 if (tu->qused >= tu->queue_size) {
1189 tu->overrun++;
1190 } else {
1191 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1192 tu->qtail %= tu->queue_size;
1193 tu->qused++;
1194 }
1195 }
1196
1197 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1198 int event,
1199 struct timespec *tstamp,
1200 unsigned long resolution)
1201 {
1202 struct snd_timer_user *tu = timeri->callback_data;
1203 struct snd_timer_tread r1;
1204 unsigned long flags;
1205
1206 if (event >= SNDRV_TIMER_EVENT_START &&
1207 event <= SNDRV_TIMER_EVENT_PAUSE)
1208 tu->tstamp = *tstamp;
1209 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1210 return;
1211 memset(&r1, 0, sizeof(r1));
1212 r1.event = event;
1213 r1.tstamp = *tstamp;
1214 r1.val = resolution;
1215 spin_lock_irqsave(&tu->qlock, flags);
1216 snd_timer_user_append_to_tqueue(tu, &r1);
1217 spin_unlock_irqrestore(&tu->qlock, flags);
1218 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1219 wake_up(&tu->qchange_sleep);
1220 }
1221
1222 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1223 unsigned long resolution,
1224 unsigned long ticks)
1225 {
1226 struct snd_timer_user *tu = timeri->callback_data;
1227 struct snd_timer_tread *r, r1;
1228 struct timespec tstamp;
1229 int prev, append = 0;
1230
1231 memset(&tstamp, 0, sizeof(tstamp));
1232 spin_lock(&tu->qlock);
1233 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1234 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1235 spin_unlock(&tu->qlock);
1236 return;
1237 }
1238 if (tu->last_resolution != resolution || ticks > 0) {
1239 if (timer_tstamp_monotonic)
1240 do_posix_clock_monotonic_gettime(&tstamp);
1241 else
1242 getnstimeofday(&tstamp);
1243 }
1244 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1245 tu->last_resolution != resolution) {
1246 memset(&r1, 0, sizeof(r1));
1247 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1248 r1.tstamp = tstamp;
1249 r1.val = resolution;
1250 snd_timer_user_append_to_tqueue(tu, &r1);
1251 tu->last_resolution = resolution;
1252 append++;
1253 }
1254 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1255 goto __wake;
1256 if (ticks == 0)
1257 goto __wake;
1258 if (tu->qused > 0) {
1259 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1260 r = &tu->tqueue[prev];
1261 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1262 r->tstamp = tstamp;
1263 r->val += ticks;
1264 append++;
1265 goto __wake;
1266 }
1267 }
1268 r1.event = SNDRV_TIMER_EVENT_TICK;
1269 r1.tstamp = tstamp;
1270 r1.val = ticks;
1271 snd_timer_user_append_to_tqueue(tu, &r1);
1272 append++;
1273 __wake:
1274 spin_unlock(&tu->qlock);
1275 if (append == 0)
1276 return;
1277 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1278 wake_up(&tu->qchange_sleep);
1279 }
1280
1281 static int snd_timer_user_open(struct inode *inode, struct file *file)
1282 {
1283 struct snd_timer_user *tu;
1284 int err;
1285
1286 err = nonseekable_open(inode, file);
1287 if (err < 0)
1288 return err;
1289
1290 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1291 if (tu == NULL)
1292 return -ENOMEM;
1293 spin_lock_init(&tu->qlock);
1294 init_waitqueue_head(&tu->qchange_sleep);
1295 mutex_init(&tu->ioctl_lock);
1296 tu->ticks = 1;
1297 tu->queue_size = 128;
1298 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1299 GFP_KERNEL);
1300 if (tu->queue == NULL) {
1301 kfree(tu);
1302 return -ENOMEM;
1303 }
1304 file->private_data = tu;
1305 return 0;
1306 }
1307
1308 static int snd_timer_user_release(struct inode *inode, struct file *file)
1309 {
1310 struct snd_timer_user *tu;
1311
1312 if (file->private_data) {
1313 tu = file->private_data;
1314 file->private_data = NULL;
1315 mutex_lock(&tu->ioctl_lock);
1316 if (tu->timeri)
1317 snd_timer_close(tu->timeri);
1318 mutex_unlock(&tu->ioctl_lock);
1319 kfree(tu->queue);
1320 kfree(tu->tqueue);
1321 kfree(tu);
1322 }
1323 return 0;
1324 }
1325
1326 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1327 {
1328 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1329 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1330 id->card = -1;
1331 id->device = -1;
1332 id->subdevice = -1;
1333 }
1334
1335 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1336 {
1337 id->dev_class = timer->tmr_class;
1338 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1339 id->card = timer->card ? timer->card->number : -1;
1340 id->device = timer->tmr_device;
1341 id->subdevice = timer->tmr_subdevice;
1342 }
1343
1344 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1345 {
1346 struct snd_timer_id id;
1347 struct snd_timer *timer;
1348 struct list_head *p;
1349
1350 if (copy_from_user(&id, _tid, sizeof(id)))
1351 return -EFAULT;
1352 mutex_lock(&register_mutex);
1353 if (id.dev_class < 0) { /* first item */
1354 if (list_empty(&snd_timer_list))
1355 snd_timer_user_zero_id(&id);
1356 else {
1357 timer = list_entry(snd_timer_list.next,
1358 struct snd_timer, device_list);
1359 snd_timer_user_copy_id(&id, timer);
1360 }
1361 } else {
1362 switch (id.dev_class) {
1363 case SNDRV_TIMER_CLASS_GLOBAL:
1364 id.device = id.device < 0 ? 0 : id.device + 1;
1365 list_for_each(p, &snd_timer_list) {
1366 timer = list_entry(p, struct snd_timer, device_list);
1367 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1368 snd_timer_user_copy_id(&id, timer);
1369 break;
1370 }
1371 if (timer->tmr_device >= id.device) {
1372 snd_timer_user_copy_id(&id, timer);
1373 break;
1374 }
1375 }
1376 if (p == &snd_timer_list)
1377 snd_timer_user_zero_id(&id);
1378 break;
1379 case SNDRV_TIMER_CLASS_CARD:
1380 case SNDRV_TIMER_CLASS_PCM:
1381 if (id.card < 0) {
1382 id.card = 0;
1383 } else {
1384 if (id.card < 0) {
1385 id.card = 0;
1386 } else {
1387 if (id.device < 0) {
1388 id.device = 0;
1389 } else {
1390 if (id.subdevice < 0) {
1391 id.subdevice = 0;
1392 } else {
1393 id.subdevice++;
1394 }
1395 }
1396 }
1397 }
1398 list_for_each(p, &snd_timer_list) {
1399 timer = list_entry(p, struct snd_timer, device_list);
1400 if (timer->tmr_class > id.dev_class) {
1401 snd_timer_user_copy_id(&id, timer);
1402 break;
1403 }
1404 if (timer->tmr_class < id.dev_class)
1405 continue;
1406 if (timer->card->number > id.card) {
1407 snd_timer_user_copy_id(&id, timer);
1408 break;
1409 }
1410 if (timer->card->number < id.card)
1411 continue;
1412 if (timer->tmr_device > id.device) {
1413 snd_timer_user_copy_id(&id, timer);
1414 break;
1415 }
1416 if (timer->tmr_device < id.device)
1417 continue;
1418 if (timer->tmr_subdevice > id.subdevice) {
1419 snd_timer_user_copy_id(&id, timer);
1420 break;
1421 }
1422 if (timer->tmr_subdevice < id.subdevice)
1423 continue;
1424 snd_timer_user_copy_id(&id, timer);
1425 break;
1426 }
1427 if (p == &snd_timer_list)
1428 snd_timer_user_zero_id(&id);
1429 break;
1430 default:
1431 snd_timer_user_zero_id(&id);
1432 }
1433 }
1434 mutex_unlock(&register_mutex);
1435 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1436 return -EFAULT;
1437 return 0;
1438 }
1439
1440 static int snd_timer_user_ginfo(struct file *file,
1441 struct snd_timer_ginfo __user *_ginfo)
1442 {
1443 struct snd_timer_ginfo *ginfo;
1444 struct snd_timer_id tid;
1445 struct snd_timer *t;
1446 struct list_head *p;
1447 int err = 0;
1448
1449 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1450 if (IS_ERR(ginfo))
1451 return PTR_ERR(ginfo);
1452
1453 tid = ginfo->tid;
1454 memset(ginfo, 0, sizeof(*ginfo));
1455 ginfo->tid = tid;
1456 mutex_lock(&register_mutex);
1457 t = snd_timer_find(&tid);
1458 if (t != NULL) {
1459 ginfo->card = t->card ? t->card->number : -1;
1460 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1461 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1462 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1463 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1464 ginfo->resolution = t->hw.resolution;
1465 if (t->hw.resolution_min > 0) {
1466 ginfo->resolution_min = t->hw.resolution_min;
1467 ginfo->resolution_max = t->hw.resolution_max;
1468 }
1469 list_for_each(p, &t->open_list_head) {
1470 ginfo->clients++;
1471 }
1472 } else {
1473 err = -ENODEV;
1474 }
1475 mutex_unlock(&register_mutex);
1476 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1477 err = -EFAULT;
1478 kfree(ginfo);
1479 return err;
1480 }
1481
1482 static int snd_timer_user_gparams(struct file *file,
1483 struct snd_timer_gparams __user *_gparams)
1484 {
1485 struct snd_timer_gparams gparams;
1486 struct snd_timer *t;
1487 int err;
1488
1489 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1490 return -EFAULT;
1491 mutex_lock(&register_mutex);
1492 t = snd_timer_find(&gparams.tid);
1493 if (!t) {
1494 err = -ENODEV;
1495 goto _error;
1496 }
1497 if (!list_empty(&t->open_list_head)) {
1498 err = -EBUSY;
1499 goto _error;
1500 }
1501 if (!t->hw.set_period) {
1502 err = -ENOSYS;
1503 goto _error;
1504 }
1505 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1506 _error:
1507 mutex_unlock(&register_mutex);
1508 return err;
1509 }
1510
1511 static int snd_timer_user_gstatus(struct file *file,
1512 struct snd_timer_gstatus __user *_gstatus)
1513 {
1514 struct snd_timer_gstatus gstatus;
1515 struct snd_timer_id tid;
1516 struct snd_timer *t;
1517 int err = 0;
1518
1519 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1520 return -EFAULT;
1521 tid = gstatus.tid;
1522 memset(&gstatus, 0, sizeof(gstatus));
1523 gstatus.tid = tid;
1524 mutex_lock(&register_mutex);
1525 t = snd_timer_find(&tid);
1526 if (t != NULL) {
1527 if (t->hw.c_resolution)
1528 gstatus.resolution = t->hw.c_resolution(t);
1529 else
1530 gstatus.resolution = t->hw.resolution;
1531 if (t->hw.precise_resolution) {
1532 t->hw.precise_resolution(t, &gstatus.resolution_num,
1533 &gstatus.resolution_den);
1534 } else {
1535 gstatus.resolution_num = gstatus.resolution;
1536 gstatus.resolution_den = 1000000000uL;
1537 }
1538 } else {
1539 err = -ENODEV;
1540 }
1541 mutex_unlock(&register_mutex);
1542 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1543 err = -EFAULT;
1544 return err;
1545 }
1546
1547 static int snd_timer_user_tselect(struct file *file,
1548 struct snd_timer_select __user *_tselect)
1549 {
1550 struct snd_timer_user *tu;
1551 struct snd_timer_select tselect;
1552 char str[32];
1553 int err = 0;
1554
1555 tu = file->private_data;
1556 if (tu->timeri) {
1557 snd_timer_close(tu->timeri);
1558 tu->timeri = NULL;
1559 }
1560 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1561 err = -EFAULT;
1562 goto __err;
1563 }
1564 sprintf(str, "application %i", current->pid);
1565 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1566 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1567 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1568 if (err < 0)
1569 goto __err;
1570
1571 kfree(tu->queue);
1572 tu->queue = NULL;
1573 kfree(tu->tqueue);
1574 tu->tqueue = NULL;
1575 if (tu->tread) {
1576 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1577 GFP_KERNEL);
1578 if (tu->tqueue == NULL)
1579 err = -ENOMEM;
1580 } else {
1581 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1582 GFP_KERNEL);
1583 if (tu->queue == NULL)
1584 err = -ENOMEM;
1585 }
1586
1587 if (err < 0) {
1588 snd_timer_close(tu->timeri);
1589 tu->timeri = NULL;
1590 } else {
1591 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1592 tu->timeri->callback = tu->tread
1593 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1594 tu->timeri->ccallback = snd_timer_user_ccallback;
1595 tu->timeri->callback_data = (void *)tu;
1596 }
1597
1598 __err:
1599 return err;
1600 }
1601
1602 static int snd_timer_user_info(struct file *file,
1603 struct snd_timer_info __user *_info)
1604 {
1605 struct snd_timer_user *tu;
1606 struct snd_timer_info *info;
1607 struct snd_timer *t;
1608 int err = 0;
1609
1610 tu = file->private_data;
1611 if (!tu->timeri)
1612 return -EBADFD;
1613 t = tu->timeri->timer;
1614 if (!t)
1615 return -EBADFD;
1616
1617 info = kzalloc(sizeof(*info), GFP_KERNEL);
1618 if (! info)
1619 return -ENOMEM;
1620 info->card = t->card ? t->card->number : -1;
1621 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1622 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1623 strlcpy(info->id, t->id, sizeof(info->id));
1624 strlcpy(info->name, t->name, sizeof(info->name));
1625 info->resolution = t->hw.resolution;
1626 if (copy_to_user(_info, info, sizeof(*_info)))
1627 err = -EFAULT;
1628 kfree(info);
1629 return err;
1630 }
1631
1632 static int snd_timer_user_params(struct file *file,
1633 struct snd_timer_params __user *_params)
1634 {
1635 struct snd_timer_user *tu;
1636 struct snd_timer_params params;
1637 struct snd_timer *t;
1638 struct snd_timer_read *tr;
1639 struct snd_timer_tread *ttr;
1640 int err;
1641
1642 tu = file->private_data;
1643 if (!tu->timeri)
1644 return -EBADFD;
1645 t = tu->timeri->timer;
1646 if (!t)
1647 return -EBADFD;
1648 if (copy_from_user(&params, _params, sizeof(params)))
1649 return -EFAULT;
1650 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1651 err = -EINVAL;
1652 goto _end;
1653 }
1654 if (params.queue_size > 0 &&
1655 (params.queue_size < 32 || params.queue_size > 1024)) {
1656 err = -EINVAL;
1657 goto _end;
1658 }
1659 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1660 (1<<SNDRV_TIMER_EVENT_TICK)|
1661 (1<<SNDRV_TIMER_EVENT_START)|
1662 (1<<SNDRV_TIMER_EVENT_STOP)|
1663 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1664 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1665 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1666 (1<<SNDRV_TIMER_EVENT_RESUME)|
1667 (1<<SNDRV_TIMER_EVENT_MSTART)|
1668 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1669 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1670 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1671 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1672 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1673 err = -EINVAL;
1674 goto _end;
1675 }
1676 snd_timer_stop(tu->timeri);
1677 spin_lock_irq(&t->lock);
1678 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1679 SNDRV_TIMER_IFLG_EXCLUSIVE|
1680 SNDRV_TIMER_IFLG_EARLY_EVENT);
1681 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1682 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1683 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1684 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1685 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1686 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1687 spin_unlock_irq(&t->lock);
1688 if (params.queue_size > 0 &&
1689 (unsigned int)tu->queue_size != params.queue_size) {
1690 if (tu->tread) {
1691 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1692 GFP_KERNEL);
1693 if (ttr) {
1694 kfree(tu->tqueue);
1695 tu->queue_size = params.queue_size;
1696 tu->tqueue = ttr;
1697 }
1698 } else {
1699 tr = kmalloc(params.queue_size * sizeof(*tr),
1700 GFP_KERNEL);
1701 if (tr) {
1702 kfree(tu->queue);
1703 tu->queue_size = params.queue_size;
1704 tu->queue = tr;
1705 }
1706 }
1707 }
1708 tu->qhead = tu->qtail = tu->qused = 0;
1709 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1710 if (tu->tread) {
1711 struct snd_timer_tread tread;
1712 memset(&tread, 0, sizeof(tread));
1713 tread.event = SNDRV_TIMER_EVENT_EARLY;
1714 tread.tstamp.tv_sec = 0;
1715 tread.tstamp.tv_nsec = 0;
1716 tread.val = 0;
1717 snd_timer_user_append_to_tqueue(tu, &tread);
1718 } else {
1719 struct snd_timer_read *r = &tu->queue[0];
1720 r->resolution = 0;
1721 r->ticks = 0;
1722 tu->qused++;
1723 tu->qtail++;
1724 }
1725 }
1726 tu->filter = params.filter;
1727 tu->ticks = params.ticks;
1728 err = 0;
1729 _end:
1730 if (copy_to_user(_params, &params, sizeof(params)))
1731 return -EFAULT;
1732 return err;
1733 }
1734
1735 static int snd_timer_user_status(struct file *file,
1736 struct snd_timer_status __user *_status)
1737 {
1738 struct snd_timer_user *tu;
1739 struct snd_timer_status status;
1740
1741 tu = file->private_data;
1742 if (!tu->timeri)
1743 return -EBADFD;
1744 memset(&status, 0, sizeof(status));
1745 status.tstamp = tu->tstamp;
1746 status.resolution = snd_timer_resolution(tu->timeri);
1747 status.lost = tu->timeri->lost;
1748 status.overrun = tu->overrun;
1749 spin_lock_irq(&tu->qlock);
1750 status.queue = tu->qused;
1751 spin_unlock_irq(&tu->qlock);
1752 if (copy_to_user(_status, &status, sizeof(status)))
1753 return -EFAULT;
1754 return 0;
1755 }
1756
1757 static int snd_timer_user_start(struct file *file)
1758 {
1759 int err;
1760 struct snd_timer_user *tu;
1761
1762 tu = file->private_data;
1763 if (!tu->timeri)
1764 return -EBADFD;
1765 snd_timer_stop(tu->timeri);
1766 tu->timeri->lost = 0;
1767 tu->last_resolution = 0;
1768 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1769 }
1770
1771 static int snd_timer_user_stop(struct file *file)
1772 {
1773 int err;
1774 struct snd_timer_user *tu;
1775
1776 tu = file->private_data;
1777 if (!tu->timeri)
1778 return -EBADFD;
1779 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1780 }
1781
1782 static int snd_timer_user_continue(struct file *file)
1783 {
1784 int err;
1785 struct snd_timer_user *tu;
1786
1787 tu = file->private_data;
1788 if (!tu->timeri)
1789 return -EBADFD;
1790 tu->timeri->lost = 0;
1791 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1792 }
1793
1794 static int snd_timer_user_pause(struct file *file)
1795 {
1796 int err;
1797 struct snd_timer_user *tu;
1798
1799 tu = file->private_data;
1800 if (!tu->timeri)
1801 return -EBADFD;
1802 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1803 }
1804
1805 enum {
1806 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1807 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1808 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1809 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1810 };
1811
1812 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1813 unsigned long arg)
1814 {
1815 struct snd_timer_user *tu;
1816 void __user *argp = (void __user *)arg;
1817 int __user *p = argp;
1818
1819 tu = file->private_data;
1820 switch (cmd) {
1821 case SNDRV_TIMER_IOCTL_PVERSION:
1822 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1823 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1824 return snd_timer_user_next_device(argp);
1825 case SNDRV_TIMER_IOCTL_TREAD:
1826 {
1827 int xarg;
1828
1829 if (tu->timeri) /* too late */
1830 return -EBUSY;
1831 if (get_user(xarg, p))
1832 return -EFAULT;
1833 tu->tread = xarg ? 1 : 0;
1834 return 0;
1835 }
1836 case SNDRV_TIMER_IOCTL_GINFO:
1837 return snd_timer_user_ginfo(file, argp);
1838 case SNDRV_TIMER_IOCTL_GPARAMS:
1839 return snd_timer_user_gparams(file, argp);
1840 case SNDRV_TIMER_IOCTL_GSTATUS:
1841 return snd_timer_user_gstatus(file, argp);
1842 case SNDRV_TIMER_IOCTL_SELECT:
1843 return snd_timer_user_tselect(file, argp);
1844 case SNDRV_TIMER_IOCTL_INFO:
1845 return snd_timer_user_info(file, argp);
1846 case SNDRV_TIMER_IOCTL_PARAMS:
1847 return snd_timer_user_params(file, argp);
1848 case SNDRV_TIMER_IOCTL_STATUS:
1849 return snd_timer_user_status(file, argp);
1850 case SNDRV_TIMER_IOCTL_START:
1851 case SNDRV_TIMER_IOCTL_START_OLD:
1852 return snd_timer_user_start(file);
1853 case SNDRV_TIMER_IOCTL_STOP:
1854 case SNDRV_TIMER_IOCTL_STOP_OLD:
1855 return snd_timer_user_stop(file);
1856 case SNDRV_TIMER_IOCTL_CONTINUE:
1857 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1858 return snd_timer_user_continue(file);
1859 case SNDRV_TIMER_IOCTL_PAUSE:
1860 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1861 return snd_timer_user_pause(file);
1862 }
1863 return -ENOTTY;
1864 }
1865
1866 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1867 unsigned long arg)
1868 {
1869 struct snd_timer_user *tu = file->private_data;
1870 long ret;
1871
1872 mutex_lock(&tu->ioctl_lock);
1873 ret = __snd_timer_user_ioctl(file, cmd, arg);
1874 mutex_unlock(&tu->ioctl_lock);
1875 return ret;
1876 }
1877
1878 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1879 {
1880 struct snd_timer_user *tu;
1881
1882 tu = file->private_data;
1883 return fasync_helper(fd, file, on, &tu->fasync);
1884 }
1885
1886 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1887 size_t count, loff_t *offset)
1888 {
1889 struct snd_timer_user *tu;
1890 long result = 0, unit;
1891 int err = 0;
1892
1893 tu = file->private_data;
1894 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1895 spin_lock_irq(&tu->qlock);
1896 while ((long)count - result >= unit) {
1897 while (!tu->qused) {
1898 wait_queue_t wait;
1899
1900 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1901 err = -EAGAIN;
1902 break;
1903 }
1904
1905 set_current_state(TASK_INTERRUPTIBLE);
1906 init_waitqueue_entry(&wait, current);
1907 add_wait_queue(&tu->qchange_sleep, &wait);
1908
1909 spin_unlock_irq(&tu->qlock);
1910 schedule();
1911 spin_lock_irq(&tu->qlock);
1912
1913 remove_wait_queue(&tu->qchange_sleep, &wait);
1914
1915 if (signal_pending(current)) {
1916 err = -ERESTARTSYS;
1917 break;
1918 }
1919 }
1920
1921 spin_unlock_irq(&tu->qlock);
1922 if (err < 0)
1923 goto _error;
1924
1925 if (tu->tread) {
1926 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1927 sizeof(struct snd_timer_tread))) {
1928 err = -EFAULT;
1929 goto _error;
1930 }
1931 } else {
1932 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1933 sizeof(struct snd_timer_read))) {
1934 err = -EFAULT;
1935 goto _error;
1936 }
1937 }
1938
1939 tu->qhead %= tu->queue_size;
1940
1941 result += unit;
1942 buffer += unit;
1943
1944 spin_lock_irq(&tu->qlock);
1945 tu->qused--;
1946 }
1947 spin_unlock_irq(&tu->qlock);
1948 _error:
1949 return result > 0 ? result : err;
1950 }
1951
1952 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1953 {
1954 unsigned int mask;
1955 struct snd_timer_user *tu;
1956
1957 tu = file->private_data;
1958
1959 poll_wait(file, &tu->qchange_sleep, wait);
1960
1961 mask = 0;
1962 if (tu->qused)
1963 mask |= POLLIN | POLLRDNORM;
1964
1965 return mask;
1966 }
1967
1968 #ifdef CONFIG_COMPAT
1969 #include "timer_compat.c"
1970 #else
1971 #define snd_timer_user_ioctl_compat NULL
1972 #endif
1973
1974 static const struct file_operations snd_timer_f_ops =
1975 {
1976 .owner = THIS_MODULE,
1977 .read = snd_timer_user_read,
1978 .open = snd_timer_user_open,
1979 .release = snd_timer_user_release,
1980 .llseek = no_llseek,
1981 .poll = snd_timer_user_poll,
1982 .unlocked_ioctl = snd_timer_user_ioctl,
1983 .compat_ioctl = snd_timer_user_ioctl_compat,
1984 .fasync = snd_timer_user_fasync,
1985 };
1986
1987 /*
1988 * ENTRY functions
1989 */
1990
1991 static int __init alsa_timer_init(void)
1992 {
1993 int err;
1994
1995 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1996 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1997 "system timer");
1998 #endif
1999
2000 if ((err = snd_timer_register_system()) < 0)
2001 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
2002 err);
2003 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2004 &snd_timer_f_ops, NULL, "timer")) < 0)
2005 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
2006 err);
2007 snd_timer_proc_init();
2008 return 0;
2009 }
2010
2011 static void __exit alsa_timer_exit(void)
2012 {
2013 struct list_head *p, *n;
2014
2015 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
2016 /* unregister the system timer */
2017 list_for_each_safe(p, n, &snd_timer_list) {
2018 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
2019 snd_timer_free(timer);
2020 }
2021 snd_timer_proc_done();
2022 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2023 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2024 #endif
2025 }
2026
2027 module_init(alsa_timer_init)
2028 module_exit(alsa_timer_exit)
2029
2030 EXPORT_SYMBOL(snd_timer_open);
2031 EXPORT_SYMBOL(snd_timer_close);
2032 EXPORT_SYMBOL(snd_timer_resolution);
2033 EXPORT_SYMBOL(snd_timer_start);
2034 EXPORT_SYMBOL(snd_timer_stop);
2035 EXPORT_SYMBOL(snd_timer_continue);
2036 EXPORT_SYMBOL(snd_timer_pause);
2037 EXPORT_SYMBOL(snd_timer_new);
2038 EXPORT_SYMBOL(snd_timer_notify);
2039 EXPORT_SYMBOL(snd_timer_global_new);
2040 EXPORT_SYMBOL(snd_timer_global_free);
2041 EXPORT_SYMBOL(snd_timer_global_register);
2042 EXPORT_SYMBOL(snd_timer_interrupt);
kernel source for telekom puls (alcatel/mediatek)