projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
ARM: dts: orion5x: fix the missing mtd flash on linkstation lswtgl
[deliverable/linux.git] / sound / core / timer.c
1 /*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <linux/device.h>
28 #include <linux/module.h>
29 #include <linux/string.h>
30 #include <sound/core.h>
31 #include <sound/timer.h>
32 #include <sound/control.h>
33 #include <sound/info.h>
34 #include <sound/minors.h>
35 #include <sound/initval.h>
36 #include <linux/kmod.h>
37
38 #if IS_ENABLED(CONFIG_SND_HRTIMER)
39 #define DEFAULT_TIMER_LIMIT 4
40 #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 static int snd_timer_dev_disconnect(struct snd_device *device)
903 {
904 struct snd_timer *timer = device->device_data;
905 struct snd_timer_instance *ti;
906
907 mutex_lock(&register_mutex);
908 list_del_init(&timer->device_list);
909 /* wake up pending sleepers */
910 list_for_each_entry(ti, &timer->open_list_head, open_list) {
911 if (ti->disconnect)
912 ti->disconnect(ti);
913 }
914 mutex_unlock(&register_mutex);
915 return 0;
916 }
917
918 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
919 {
920 unsigned long flags;
921 unsigned long resolution = 0;
922 struct snd_timer_instance *ti, *ts;
923
924 if (timer->card && timer->card->shutdown)
925 return;
926 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
927 return;
928 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
929 event > SNDRV_TIMER_EVENT_MRESUME))
930 return;
931 spin_lock_irqsave(&timer->lock, flags);
932 if (event == SNDRV_TIMER_EVENT_MSTART ||
933 event == SNDRV_TIMER_EVENT_MCONTINUE ||
934 event == SNDRV_TIMER_EVENT_MRESUME) {
935 if (timer->hw.c_resolution)
936 resolution = timer->hw.c_resolution(timer);
937 else
938 resolution = timer->hw.resolution;
939 }
940 list_for_each_entry(ti, &timer->active_list_head, active_list) {
941 if (ti->ccallback)
942 ti->ccallback(ti, event, tstamp, resolution);
943 list_for_each_entry(ts, &ti->slave_active_head, active_list)
944 if (ts->ccallback)
945 ts->ccallback(ts, event, tstamp, resolution);
946 }
947 spin_unlock_irqrestore(&timer->lock, flags);
948 }
949
950 /*
951 * exported functions for global timers
952 */
953 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
954 {
955 struct snd_timer_id tid;
956
957 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
958 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
959 tid.card = -1;
960 tid.device = device;
961 tid.subdevice = 0;
962 return snd_timer_new(NULL, id, &tid, rtimer);
963 }
964
965 int snd_timer_global_free(struct snd_timer *timer)
966 {
967 return snd_timer_free(timer);
968 }
969
970 int snd_timer_global_register(struct snd_timer *timer)
971 {
972 struct snd_device dev;
973
974 memset(&dev, 0, sizeof(dev));
975 dev.device_data = timer;
976 return snd_timer_dev_register(&dev);
977 }
978
979 /*
980 * System timer
981 */
982
983 struct snd_timer_system_private {
984 struct timer_list tlist;
985 unsigned long last_expires;
986 unsigned long last_jiffies;
987 unsigned long correction;
988 };
989
990 static void snd_timer_s_function(unsigned long data)
991 {
992 struct snd_timer *timer = (struct snd_timer *)data;
993 struct snd_timer_system_private *priv = timer->private_data;
994 unsigned long jiff = jiffies;
995 if (time_after(jiff, priv->last_expires))
996 priv->correction += (long)jiff - (long)priv->last_expires;
997 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
998 }
999
1000 static int snd_timer_s_start(struct snd_timer * timer)
1001 {
1002 struct snd_timer_system_private *priv;
1003 unsigned long njiff;
1004
1005 priv = (struct snd_timer_system_private *) timer->private_data;
1006 njiff = (priv->last_jiffies = jiffies);
1007 if (priv->correction > timer->sticks - 1) {
1008 priv->correction -= timer->sticks - 1;
1009 njiff++;
1010 } else {
1011 njiff += timer->sticks - priv->correction;
1012 priv->correction = 0;
1013 }
1014 priv->last_expires = priv->tlist.expires = njiff;
1015 add_timer(&priv->tlist);
1016 return 0;
1017 }
1018
1019 static int snd_timer_s_stop(struct snd_timer * timer)
1020 {
1021 struct snd_timer_system_private *priv;
1022 unsigned long jiff;
1023
1024 priv = (struct snd_timer_system_private *) timer->private_data;
1025 del_timer(&priv->tlist);
1026 jiff = jiffies;
1027 if (time_before(jiff, priv->last_expires))
1028 timer->sticks = priv->last_expires - jiff;
1029 else
1030 timer->sticks = 1;
1031 priv->correction = 0;
1032 return 0;
1033 }
1034
1035 static struct snd_timer_hardware snd_timer_system =
1036 {
1037 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1038 .resolution = 1000000000L / HZ,
1039 .ticks = 10000000L,
1040 .start = snd_timer_s_start,
1041 .stop = snd_timer_s_stop
1042 };
1043
1044 static void snd_timer_free_system(struct snd_timer *timer)
1045 {
1046 kfree(timer->private_data);
1047 }
1048
1049 static int snd_timer_register_system(void)
1050 {
1051 struct snd_timer *timer;
1052 struct snd_timer_system_private *priv;
1053 int err;
1054
1055 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1056 if (err < 0)
1057 return err;
1058 strcpy(timer->name, "system timer");
1059 timer->hw = snd_timer_system;
1060 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1061 if (priv == NULL) {
1062 snd_timer_free(timer);
1063 return -ENOMEM;
1064 }
1065 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1066 timer->private_data = priv;
1067 timer->private_free = snd_timer_free_system;
1068 return snd_timer_global_register(timer);
1069 }
1070
1071 #ifdef CONFIG_SND_PROC_FS
1072 /*
1073 * Info interface
1074 */
1075
1076 static void snd_timer_proc_read(struct snd_info_entry *entry,
1077 struct snd_info_buffer *buffer)
1078 {
1079 struct snd_timer *timer;
1080 struct snd_timer_instance *ti;
1081
1082 mutex_lock(&register_mutex);
1083 list_for_each_entry(timer, &snd_timer_list, device_list) {
1084 if (timer->card && timer->card->shutdown)
1085 continue;
1086 switch (timer->tmr_class) {
1087 case SNDRV_TIMER_CLASS_GLOBAL:
1088 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1089 break;
1090 case SNDRV_TIMER_CLASS_CARD:
1091 snd_iprintf(buffer, "C%i-%i: ",
1092 timer->card->number, timer->tmr_device);
1093 break;
1094 case SNDRV_TIMER_CLASS_PCM:
1095 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1096 timer->tmr_device, timer->tmr_subdevice);
1097 break;
1098 default:
1099 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1100 timer->card ? timer->card->number : -1,
1101 timer->tmr_device, timer->tmr_subdevice);
1102 }
1103 snd_iprintf(buffer, "%s :", timer->name);
1104 if (timer->hw.resolution)
1105 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1106 timer->hw.resolution / 1000,
1107 timer->hw.resolution % 1000,
1108 timer->hw.ticks);
1109 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1110 snd_iprintf(buffer, " SLAVE");
1111 snd_iprintf(buffer, "\n");
1112 list_for_each_entry(ti, &timer->open_list_head, open_list)
1113 snd_iprintf(buffer, " Client %s : %s\n",
1114 ti->owner ? ti->owner : "unknown",
1115 ti->flags & (SNDRV_TIMER_IFLG_START |
1116 SNDRV_TIMER_IFLG_RUNNING)
1117 ? "running" : "stopped");
1118 }
1119 mutex_unlock(&register_mutex);
1120 }
1121
1122 static struct snd_info_entry *snd_timer_proc_entry;
1123
1124 static void __init snd_timer_proc_init(void)
1125 {
1126 struct snd_info_entry *entry;
1127
1128 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1129 if (entry != NULL) {
1130 entry->c.text.read = snd_timer_proc_read;
1131 if (snd_info_register(entry) < 0) {
1132 snd_info_free_entry(entry);
1133 entry = NULL;
1134 }
1135 }
1136 snd_timer_proc_entry = entry;
1137 }
1138
1139 static void __exit snd_timer_proc_done(void)
1140 {
1141 snd_info_free_entry(snd_timer_proc_entry);
1142 }
1143 #else /* !CONFIG_SND_PROC_FS */
1144 #define snd_timer_proc_init()
1145 #define snd_timer_proc_done()
1146 #endif
1147
1148 /*
1149 * USER SPACE interface
1150 */
1151
1152 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1153 unsigned long resolution,
1154 unsigned long ticks)
1155 {
1156 struct snd_timer_user *tu = timeri->callback_data;
1157 struct snd_timer_read *r;
1158 int prev;
1159
1160 spin_lock(&tu->qlock);
1161 if (tu->qused > 0) {
1162 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1163 r = &tu->queue[prev];
1164 if (r->resolution == resolution) {
1165 r->ticks += ticks;
1166 goto __wake;
1167 }
1168 }
1169 if (tu->qused >= tu->queue_size) {
1170 tu->overrun++;
1171 } else {
1172 r = &tu->queue[tu->qtail++];
1173 tu->qtail %= tu->queue_size;
1174 r->resolution = resolution;
1175 r->ticks = ticks;
1176 tu->qused++;
1177 }
1178 __wake:
1179 spin_unlock(&tu->qlock);
1180 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1181 wake_up(&tu->qchange_sleep);
1182 }
1183
1184 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1185 struct snd_timer_tread *tread)
1186 {
1187 if (tu->qused >= tu->queue_size) {
1188 tu->overrun++;
1189 } else {
1190 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1191 tu->qtail %= tu->queue_size;
1192 tu->qused++;
1193 }
1194 }
1195
1196 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1197 int event,
1198 struct timespec *tstamp,
1199 unsigned long resolution)
1200 {
1201 struct snd_timer_user *tu = timeri->callback_data;
1202 struct snd_timer_tread r1;
1203 unsigned long flags;
1204
1205 if (event >= SNDRV_TIMER_EVENT_START &&
1206 event <= SNDRV_TIMER_EVENT_PAUSE)
1207 tu->tstamp = *tstamp;
1208 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1209 return;
1210 r1.event = event;
1211 r1.tstamp = *tstamp;
1212 r1.val = resolution;
1213 spin_lock_irqsave(&tu->qlock, flags);
1214 snd_timer_user_append_to_tqueue(tu, &r1);
1215 spin_unlock_irqrestore(&tu->qlock, flags);
1216 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1217 wake_up(&tu->qchange_sleep);
1218 }
1219
1220 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1221 {
1222 struct snd_timer_user *tu = timeri->callback_data;
1223
1224 tu->disconnected = true;
1225 wake_up(&tu->qchange_sleep);
1226 }
1227
1228 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1229 unsigned long resolution,
1230 unsigned long ticks)
1231 {
1232 struct snd_timer_user *tu = timeri->callback_data;
1233 struct snd_timer_tread *r, r1;
1234 struct timespec tstamp;
1235 int prev, append = 0;
1236
1237 memset(&tstamp, 0, sizeof(tstamp));
1238 spin_lock(&tu->qlock);
1239 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1240 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1241 spin_unlock(&tu->qlock);
1242 return;
1243 }
1244 if (tu->last_resolution != resolution || ticks > 0) {
1245 if (timer_tstamp_monotonic)
1246 ktime_get_ts(&tstamp);
1247 else
1248 getnstimeofday(&tstamp);
1249 }
1250 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1251 tu->last_resolution != resolution) {
1252 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1253 r1.tstamp = tstamp;
1254 r1.val = resolution;
1255 snd_timer_user_append_to_tqueue(tu, &r1);
1256 tu->last_resolution = resolution;
1257 append++;
1258 }
1259 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1260 goto __wake;
1261 if (ticks == 0)
1262 goto __wake;
1263 if (tu->qused > 0) {
1264 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1265 r = &tu->tqueue[prev];
1266 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1267 r->tstamp = tstamp;
1268 r->val += ticks;
1269 append++;
1270 goto __wake;
1271 }
1272 }
1273 r1.event = SNDRV_TIMER_EVENT_TICK;
1274 r1.tstamp = tstamp;
1275 r1.val = ticks;
1276 snd_timer_user_append_to_tqueue(tu, &r1);
1277 append++;
1278 __wake:
1279 spin_unlock(&tu->qlock);
1280 if (append == 0)
1281 return;
1282 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1283 wake_up(&tu->qchange_sleep);
1284 }
1285
1286 static int snd_timer_user_open(struct inode *inode, struct file *file)
1287 {
1288 struct snd_timer_user *tu;
1289 int err;
1290
1291 err = nonseekable_open(inode, file);
1292 if (err < 0)
1293 return err;
1294
1295 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1296 if (tu == NULL)
1297 return -ENOMEM;
1298 spin_lock_init(&tu->qlock);
1299 init_waitqueue_head(&tu->qchange_sleep);
1300 mutex_init(&tu->ioctl_lock);
1301 tu->ticks = 1;
1302 tu->queue_size = 128;
1303 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1304 GFP_KERNEL);
1305 if (tu->queue == NULL) {
1306 kfree(tu);
1307 return -ENOMEM;
1308 }
1309 file->private_data = tu;
1310 return 0;
1311 }
1312
1313 static int snd_timer_user_release(struct inode *inode, struct file *file)
1314 {
1315 struct snd_timer_user *tu;
1316
1317 if (file->private_data) {
1318 tu = file->private_data;
1319 file->private_data = NULL;
1320 mutex_lock(&tu->ioctl_lock);
1321 if (tu->timeri)
1322 snd_timer_close(tu->timeri);
1323 mutex_unlock(&tu->ioctl_lock);
1324 kfree(tu->queue);
1325 kfree(tu->tqueue);
1326 kfree(tu);
1327 }
1328 return 0;
1329 }
1330
1331 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1332 {
1333 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1334 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1335 id->card = -1;
1336 id->device = -1;
1337 id->subdevice = -1;
1338 }
1339
1340 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1341 {
1342 id->dev_class = timer->tmr_class;
1343 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1344 id->card = timer->card ? timer->card->number : -1;
1345 id->device = timer->tmr_device;
1346 id->subdevice = timer->tmr_subdevice;
1347 }
1348
1349 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1350 {
1351 struct snd_timer_id id;
1352 struct snd_timer *timer;
1353 struct list_head *p;
1354
1355 if (copy_from_user(&id, _tid, sizeof(id)))
1356 return -EFAULT;
1357 mutex_lock(&register_mutex);
1358 if (id.dev_class < 0) { /* first item */
1359 if (list_empty(&snd_timer_list))
1360 snd_timer_user_zero_id(&id);
1361 else {
1362 timer = list_entry(snd_timer_list.next,
1363 struct snd_timer, device_list);
1364 snd_timer_user_copy_id(&id, timer);
1365 }
1366 } else {
1367 switch (id.dev_class) {
1368 case SNDRV_TIMER_CLASS_GLOBAL:
1369 id.device = id.device < 0 ? 0 : id.device + 1;
1370 list_for_each(p, &snd_timer_list) {
1371 timer = list_entry(p, struct snd_timer, device_list);
1372 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1373 snd_timer_user_copy_id(&id, timer);
1374 break;
1375 }
1376 if (timer->tmr_device >= id.device) {
1377 snd_timer_user_copy_id(&id, timer);
1378 break;
1379 }
1380 }
1381 if (p == &snd_timer_list)
1382 snd_timer_user_zero_id(&id);
1383 break;
1384 case SNDRV_TIMER_CLASS_CARD:
1385 case SNDRV_TIMER_CLASS_PCM:
1386 if (id.card < 0) {
1387 id.card = 0;
1388 } else {
1389 if (id.card < 0) {
1390 id.card = 0;
1391 } else {
1392 if (id.device < 0) {
1393 id.device = 0;
1394 } else {
1395 if (id.subdevice < 0) {
1396 id.subdevice = 0;
1397 } else {
1398 id.subdevice++;
1399 }
1400 }
1401 }
1402 }
1403 list_for_each(p, &snd_timer_list) {
1404 timer = list_entry(p, struct snd_timer, device_list);
1405 if (timer->tmr_class > id.dev_class) {
1406 snd_timer_user_copy_id(&id, timer);
1407 break;
1408 }
1409 if (timer->tmr_class < id.dev_class)
1410 continue;
1411 if (timer->card->number > id.card) {
1412 snd_timer_user_copy_id(&id, timer);
1413 break;
1414 }
1415 if (timer->card->number < id.card)
1416 continue;
1417 if (timer->tmr_device > id.device) {
1418 snd_timer_user_copy_id(&id, timer);
1419 break;
1420 }
1421 if (timer->tmr_device < id.device)
1422 continue;
1423 if (timer->tmr_subdevice > id.subdevice) {
1424 snd_timer_user_copy_id(&id, timer);
1425 break;
1426 }
1427 if (timer->tmr_subdevice < id.subdevice)
1428 continue;
1429 snd_timer_user_copy_id(&id, timer);
1430 break;
1431 }
1432 if (p == &snd_timer_list)
1433 snd_timer_user_zero_id(&id);
1434 break;
1435 default:
1436 snd_timer_user_zero_id(&id);
1437 }
1438 }
1439 mutex_unlock(&register_mutex);
1440 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1441 return -EFAULT;
1442 return 0;
1443 }
1444
1445 static int snd_timer_user_ginfo(struct file *file,
1446 struct snd_timer_ginfo __user *_ginfo)
1447 {
1448 struct snd_timer_ginfo *ginfo;
1449 struct snd_timer_id tid;
1450 struct snd_timer *t;
1451 struct list_head *p;
1452 int err = 0;
1453
1454 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1455 if (IS_ERR(ginfo))
1456 return PTR_ERR(ginfo);
1457
1458 tid = ginfo->tid;
1459 memset(ginfo, 0, sizeof(*ginfo));
1460 ginfo->tid = tid;
1461 mutex_lock(&register_mutex);
1462 t = snd_timer_find(&tid);
1463 if (t != NULL) {
1464 ginfo->card = t->card ? t->card->number : -1;
1465 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1466 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1467 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1468 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1469 ginfo->resolution = t->hw.resolution;
1470 if (t->hw.resolution_min > 0) {
1471 ginfo->resolution_min = t->hw.resolution_min;
1472 ginfo->resolution_max = t->hw.resolution_max;
1473 }
1474 list_for_each(p, &t->open_list_head) {
1475 ginfo->clients++;
1476 }
1477 } else {
1478 err = -ENODEV;
1479 }
1480 mutex_unlock(&register_mutex);
1481 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1482 err = -EFAULT;
1483 kfree(ginfo);
1484 return err;
1485 }
1486
1487 static int snd_timer_user_gparams(struct file *file,
1488 struct snd_timer_gparams __user *_gparams)
1489 {
1490 struct snd_timer_gparams gparams;
1491 struct snd_timer *t;
1492 int err;
1493
1494 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1495 return -EFAULT;
1496 mutex_lock(&register_mutex);
1497 t = snd_timer_find(&gparams.tid);
1498 if (!t) {
1499 err = -ENODEV;
1500 goto _error;
1501 }
1502 if (!list_empty(&t->open_list_head)) {
1503 err = -EBUSY;
1504 goto _error;
1505 }
1506 if (!t->hw.set_period) {
1507 err = -ENOSYS;
1508 goto _error;
1509 }
1510 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1511 _error:
1512 mutex_unlock(&register_mutex);
1513 return err;
1514 }
1515
1516 static int snd_timer_user_gstatus(struct file *file,
1517 struct snd_timer_gstatus __user *_gstatus)
1518 {
1519 struct snd_timer_gstatus gstatus;
1520 struct snd_timer_id tid;
1521 struct snd_timer *t;
1522 int err = 0;
1523
1524 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1525 return -EFAULT;
1526 tid = gstatus.tid;
1527 memset(&gstatus, 0, sizeof(gstatus));
1528 gstatus.tid = tid;
1529 mutex_lock(&register_mutex);
1530 t = snd_timer_find(&tid);
1531 if (t != NULL) {
1532 if (t->hw.c_resolution)
1533 gstatus.resolution = t->hw.c_resolution(t);
1534 else
1535 gstatus.resolution = t->hw.resolution;
1536 if (t->hw.precise_resolution) {
1537 t->hw.precise_resolution(t, &gstatus.resolution_num,
1538 &gstatus.resolution_den);
1539 } else {
1540 gstatus.resolution_num = gstatus.resolution;
1541 gstatus.resolution_den = 1000000000uL;
1542 }
1543 } else {
1544 err = -ENODEV;
1545 }
1546 mutex_unlock(&register_mutex);
1547 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1548 err = -EFAULT;
1549 return err;
1550 }
1551
1552 static int snd_timer_user_tselect(struct file *file,
1553 struct snd_timer_select __user *_tselect)
1554 {
1555 struct snd_timer_user *tu;
1556 struct snd_timer_select tselect;
1557 char str[32];
1558 int err = 0;
1559
1560 tu = file->private_data;
1561 if (tu->timeri) {
1562 snd_timer_close(tu->timeri);
1563 tu->timeri = NULL;
1564 }
1565 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1566 err = -EFAULT;
1567 goto __err;
1568 }
1569 sprintf(str, "application %i", current->pid);
1570 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1571 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1572 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1573 if (err < 0)
1574 goto __err;
1575
1576 kfree(tu->queue);
1577 tu->queue = NULL;
1578 kfree(tu->tqueue);
1579 tu->tqueue = NULL;
1580 if (tu->tread) {
1581 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1582 GFP_KERNEL);
1583 if (tu->tqueue == NULL)
1584 err = -ENOMEM;
1585 } else {
1586 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1587 GFP_KERNEL);
1588 if (tu->queue == NULL)
1589 err = -ENOMEM;
1590 }
1591
1592 if (err < 0) {
1593 snd_timer_close(tu->timeri);
1594 tu->timeri = NULL;
1595 } else {
1596 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1597 tu->timeri->callback = tu->tread
1598 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1599 tu->timeri->ccallback = snd_timer_user_ccallback;
1600 tu->timeri->callback_data = (void *)tu;
1601 tu->timeri->disconnect = snd_timer_user_disconnect;
1602 }
1603
1604 __err:
1605 return err;
1606 }
1607
1608 static int snd_timer_user_info(struct file *file,
1609 struct snd_timer_info __user *_info)
1610 {
1611 struct snd_timer_user *tu;
1612 struct snd_timer_info *info;
1613 struct snd_timer *t;
1614 int err = 0;
1615
1616 tu = file->private_data;
1617 if (!tu->timeri)
1618 return -EBADFD;
1619 t = tu->timeri->timer;
1620 if (!t)
1621 return -EBADFD;
1622
1623 info = kzalloc(sizeof(*info), GFP_KERNEL);
1624 if (! info)
1625 return -ENOMEM;
1626 info->card = t->card ? t->card->number : -1;
1627 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1628 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1629 strlcpy(info->id, t->id, sizeof(info->id));
1630 strlcpy(info->name, t->name, sizeof(info->name));
1631 info->resolution = t->hw.resolution;
1632 if (copy_to_user(_info, info, sizeof(*_info)))
1633 err = -EFAULT;
1634 kfree(info);
1635 return err;
1636 }
1637
1638 static int snd_timer_user_params(struct file *file,
1639 struct snd_timer_params __user *_params)
1640 {
1641 struct snd_timer_user *tu;
1642 struct snd_timer_params params;
1643 struct snd_timer *t;
1644 struct snd_timer_read *tr;
1645 struct snd_timer_tread *ttr;
1646 int err;
1647
1648 tu = file->private_data;
1649 if (!tu->timeri)
1650 return -EBADFD;
1651 t = tu->timeri->timer;
1652 if (!t)
1653 return -EBADFD;
1654 if (copy_from_user(&params, _params, sizeof(params)))
1655 return -EFAULT;
1656 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1657 err = -EINVAL;
1658 goto _end;
1659 }
1660 if (params.queue_size > 0 &&
1661 (params.queue_size < 32 || params.queue_size > 1024)) {
1662 err = -EINVAL;
1663 goto _end;
1664 }
1665 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1666 (1<<SNDRV_TIMER_EVENT_TICK)|
1667 (1<<SNDRV_TIMER_EVENT_START)|
1668 (1<<SNDRV_TIMER_EVENT_STOP)|
1669 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1670 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1671 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1672 (1<<SNDRV_TIMER_EVENT_RESUME)|
1673 (1<<SNDRV_TIMER_EVENT_MSTART)|
1674 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1675 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1676 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1677 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1678 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1679 err = -EINVAL;
1680 goto _end;
1681 }
1682 snd_timer_stop(tu->timeri);
1683 spin_lock_irq(&t->lock);
1684 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1685 SNDRV_TIMER_IFLG_EXCLUSIVE|
1686 SNDRV_TIMER_IFLG_EARLY_EVENT);
1687 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1688 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1689 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1690 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1691 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1692 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1693 spin_unlock_irq(&t->lock);
1694 if (params.queue_size > 0 &&
1695 (unsigned int)tu->queue_size != params.queue_size) {
1696 if (tu->tread) {
1697 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1698 GFP_KERNEL);
1699 if (ttr) {
1700 kfree(tu->tqueue);
1701 tu->queue_size = params.queue_size;
1702 tu->tqueue = ttr;
1703 }
1704 } else {
1705 tr = kmalloc(params.queue_size * sizeof(*tr),
1706 GFP_KERNEL);
1707 if (tr) {
1708 kfree(tu->queue);
1709 tu->queue_size = params.queue_size;
1710 tu->queue = tr;
1711 }
1712 }
1713 }
1714 tu->qhead = tu->qtail = tu->qused = 0;
1715 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1716 if (tu->tread) {
1717 struct snd_timer_tread tread;
1718 tread.event = SNDRV_TIMER_EVENT_EARLY;
1719 tread.tstamp.tv_sec = 0;
1720 tread.tstamp.tv_nsec = 0;
1721 tread.val = 0;
1722 snd_timer_user_append_to_tqueue(tu, &tread);
1723 } else {
1724 struct snd_timer_read *r = &tu->queue[0];
1725 r->resolution = 0;
1726 r->ticks = 0;
1727 tu->qused++;
1728 tu->qtail++;
1729 }
1730 }
1731 tu->filter = params.filter;
1732 tu->ticks = params.ticks;
1733 err = 0;
1734 _end:
1735 if (copy_to_user(_params, &params, sizeof(params)))
1736 return -EFAULT;
1737 return err;
1738 }
1739
1740 static int snd_timer_user_status(struct file *file,
1741 struct snd_timer_status __user *_status)
1742 {
1743 struct snd_timer_user *tu;
1744 struct snd_timer_status status;
1745
1746 tu = file->private_data;
1747 if (!tu->timeri)
1748 return -EBADFD;
1749 memset(&status, 0, sizeof(status));
1750 status.tstamp = tu->tstamp;
1751 status.resolution = snd_timer_resolution(tu->timeri);
1752 status.lost = tu->timeri->lost;
1753 status.overrun = tu->overrun;
1754 spin_lock_irq(&tu->qlock);
1755 status.queue = tu->qused;
1756 spin_unlock_irq(&tu->qlock);
1757 if (copy_to_user(_status, &status, sizeof(status)))
1758 return -EFAULT;
1759 return 0;
1760 }
1761
1762 static int snd_timer_user_start(struct file *file)
1763 {
1764 int err;
1765 struct snd_timer_user *tu;
1766
1767 tu = file->private_data;
1768 if (!tu->timeri)
1769 return -EBADFD;
1770 snd_timer_stop(tu->timeri);
1771 tu->timeri->lost = 0;
1772 tu->last_resolution = 0;
1773 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1774 }
1775
1776 static int snd_timer_user_stop(struct file *file)
1777 {
1778 int err;
1779 struct snd_timer_user *tu;
1780
1781 tu = file->private_data;
1782 if (!tu->timeri)
1783 return -EBADFD;
1784 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1785 }
1786
1787 static int snd_timer_user_continue(struct file *file)
1788 {
1789 int err;
1790 struct snd_timer_user *tu;
1791
1792 tu = file->private_data;
1793 if (!tu->timeri)
1794 return -EBADFD;
1795 tu->timeri->lost = 0;
1796 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1797 }
1798
1799 static int snd_timer_user_pause(struct file *file)
1800 {
1801 int err;
1802 struct snd_timer_user *tu;
1803
1804 tu = file->private_data;
1805 if (!tu->timeri)
1806 return -EBADFD;
1807 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1808 }
1809
1810 enum {
1811 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1812 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1813 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1814 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1815 };
1816
1817 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1818 unsigned long arg)
1819 {
1820 struct snd_timer_user *tu;
1821 void __user *argp = (void __user *)arg;
1822 int __user *p = argp;
1823
1824 tu = file->private_data;
1825 switch (cmd) {
1826 case SNDRV_TIMER_IOCTL_PVERSION:
1827 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1828 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1829 return snd_timer_user_next_device(argp);
1830 case SNDRV_TIMER_IOCTL_TREAD:
1831 {
1832 int xarg;
1833
1834 if (tu->timeri) /* too late */
1835 return -EBUSY;
1836 if (get_user(xarg, p))
1837 return -EFAULT;
1838 tu->tread = xarg ? 1 : 0;
1839 return 0;
1840 }
1841 case SNDRV_TIMER_IOCTL_GINFO:
1842 return snd_timer_user_ginfo(file, argp);
1843 case SNDRV_TIMER_IOCTL_GPARAMS:
1844 return snd_timer_user_gparams(file, argp);
1845 case SNDRV_TIMER_IOCTL_GSTATUS:
1846 return snd_timer_user_gstatus(file, argp);
1847 case SNDRV_TIMER_IOCTL_SELECT:
1848 return snd_timer_user_tselect(file, argp);
1849 case SNDRV_TIMER_IOCTL_INFO:
1850 return snd_timer_user_info(file, argp);
1851 case SNDRV_TIMER_IOCTL_PARAMS:
1852 return snd_timer_user_params(file, argp);
1853 case SNDRV_TIMER_IOCTL_STATUS:
1854 return snd_timer_user_status(file, argp);
1855 case SNDRV_TIMER_IOCTL_START:
1856 case SNDRV_TIMER_IOCTL_START_OLD:
1857 return snd_timer_user_start(file);
1858 case SNDRV_TIMER_IOCTL_STOP:
1859 case SNDRV_TIMER_IOCTL_STOP_OLD:
1860 return snd_timer_user_stop(file);
1861 case SNDRV_TIMER_IOCTL_CONTINUE:
1862 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1863 return snd_timer_user_continue(file);
1864 case SNDRV_TIMER_IOCTL_PAUSE:
1865 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1866 return snd_timer_user_pause(file);
1867 }
1868 return -ENOTTY;
1869 }
1870
1871 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1872 unsigned long arg)
1873 {
1874 struct snd_timer_user *tu = file->private_data;
1875 long ret;
1876
1877 mutex_lock(&tu->ioctl_lock);
1878 ret = __snd_timer_user_ioctl(file, cmd, arg);
1879 mutex_unlock(&tu->ioctl_lock);
1880 return ret;
1881 }
1882
1883 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1884 {
1885 struct snd_timer_user *tu;
1886
1887 tu = file->private_data;
1888 return fasync_helper(fd, file, on, &tu->fasync);
1889 }
1890
1891 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1892 size_t count, loff_t *offset)
1893 {
1894 struct snd_timer_user *tu;
1895 long result = 0, unit;
1896 int err = 0;
1897
1898 tu = file->private_data;
1899 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1900 spin_lock_irq(&tu->qlock);
1901 while ((long)count - result >= unit) {
1902 while (!tu->qused) {
1903 wait_queue_t wait;
1904
1905 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1906 err = -EAGAIN;
1907 break;
1908 }
1909
1910 set_current_state(TASK_INTERRUPTIBLE);
1911 init_waitqueue_entry(&wait, current);
1912 add_wait_queue(&tu->qchange_sleep, &wait);
1913
1914 spin_unlock_irq(&tu->qlock);
1915 schedule();
1916 spin_lock_irq(&tu->qlock);
1917
1918 remove_wait_queue(&tu->qchange_sleep, &wait);
1919
1920 if (tu->disconnected) {
1921 err = -ENODEV;
1922 break;
1923 }
1924 if (signal_pending(current)) {
1925 err = -ERESTARTSYS;
1926 break;
1927 }
1928 }
1929
1930 spin_unlock_irq(&tu->qlock);
1931 if (err < 0)
1932 goto _error;
1933
1934 if (tu->tread) {
1935 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1936 sizeof(struct snd_timer_tread))) {
1937 err = -EFAULT;
1938 goto _error;
1939 }
1940 } else {
1941 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1942 sizeof(struct snd_timer_read))) {
1943 err = -EFAULT;
1944 goto _error;
1945 }
1946 }
1947
1948 tu->qhead %= tu->queue_size;
1949
1950 result += unit;
1951 buffer += unit;
1952
1953 spin_lock_irq(&tu->qlock);
1954 tu->qused--;
1955 }
1956 spin_unlock_irq(&tu->qlock);
1957 _error:
1958 return result > 0 ? result : err;
1959 }
1960
1961 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1962 {
1963 unsigned int mask;
1964 struct snd_timer_user *tu;
1965
1966 tu = file->private_data;
1967
1968 poll_wait(file, &tu->qchange_sleep, wait);
1969
1970 mask = 0;
1971 if (tu->qused)
1972 mask |= POLLIN | POLLRDNORM;
1973 if (tu->disconnected)
1974 mask |= POLLERR;
1975
1976 return mask;
1977 }
1978
1979 #ifdef CONFIG_COMPAT
1980 #include "timer_compat.c"
1981 #else
1982 #define snd_timer_user_ioctl_compat NULL
1983 #endif
1984
1985 static const struct file_operations snd_timer_f_ops =
1986 {
1987 .owner = THIS_MODULE,
1988 .read = snd_timer_user_read,
1989 .open = snd_timer_user_open,
1990 .release = snd_timer_user_release,
1991 .llseek = no_llseek,
1992 .poll = snd_timer_user_poll,
1993 .unlocked_ioctl = snd_timer_user_ioctl,
1994 .compat_ioctl = snd_timer_user_ioctl_compat,
1995 .fasync = snd_timer_user_fasync,
1996 };
1997
1998 /* unregister the system timer */
1999 static void snd_timer_free_all(void)
2000 {
2001 struct snd_timer *timer, *n;
2002
2003 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2004 snd_timer_free(timer);
2005 }
2006
2007 static struct device timer_dev;
2008
2009 /*
2010 * ENTRY functions
2011 */
2012
2013 static int __init alsa_timer_init(void)
2014 {
2015 int err;
2016
2017 snd_device_initialize(&timer_dev, NULL);
2018 dev_set_name(&timer_dev, "timer");
2019
2020 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2021 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2022 "system timer");
2023 #endif
2024
2025 err = snd_timer_register_system();
2026 if (err < 0) {
2027 pr_err("ALSA: unable to register system timer (%i)\n", err);
2028 put_device(&timer_dev);
2029 return err;
2030 }
2031
2032 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2033 &snd_timer_f_ops, NULL, &timer_dev);
2034 if (err < 0) {
2035 pr_err("ALSA: unable to register timer device (%i)\n", err);
2036 snd_timer_free_all();
2037 put_device(&timer_dev);
2038 return err;
2039 }
2040
2041 snd_timer_proc_init();
2042 return 0;
2043 }
2044
2045 static void __exit alsa_timer_exit(void)
2046 {
2047 snd_unregister_device(&timer_dev);
2048 snd_timer_free_all();
2049 put_device(&timer_dev);
2050 snd_timer_proc_done();
2051 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2052 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2053 #endif
2054 }
2055
2056 module_init(alsa_timer_init)
2057 module_exit(alsa_timer_exit)
2058
2059 EXPORT_SYMBOL(snd_timer_open);
2060 EXPORT_SYMBOL(snd_timer_close);
2061 EXPORT_SYMBOL(snd_timer_resolution);
2062 EXPORT_SYMBOL(snd_timer_start);
2063 EXPORT_SYMBOL(snd_timer_stop);
2064 EXPORT_SYMBOL(snd_timer_continue);
2065 EXPORT_SYMBOL(snd_timer_pause);
2066 EXPORT_SYMBOL(snd_timer_new);
2067 EXPORT_SYMBOL(snd_timer_notify);
2068 EXPORT_SYMBOL(snd_timer_global_new);
2069 EXPORT_SYMBOL(snd_timer_global_free);
2070 EXPORT_SYMBOL(snd_timer_global_register);
2071 EXPORT_SYMBOL(snd_timer_interrupt);
Linux kernel - Deliverables
This page took 0.113143 seconds and 5 git commands to generate.