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Merge branch 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-eoan-kernel.git] / sound / core / timer.c
1 /*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <linux/device.h>
28 #include <linux/module.h>
29 #include <linux/string.h>
30 #include <linux/sched/signal.h>
31 #include <sound/core.h>
32 #include <sound/timer.h>
33 #include <sound/control.h>
34 #include <sound/info.h>
35 #include <sound/minors.h>
36 #include <sound/initval.h>
37 #include <linux/kmod.h>
38
39 /* internal flags */
40 #define SNDRV_TIMER_IFLG_PAUSED 0x00010000
41
42 #if IS_ENABLED(CONFIG_SND_HRTIMER)
43 #define DEFAULT_TIMER_LIMIT 4
44 #else
45 #define DEFAULT_TIMER_LIMIT 1
46 #endif
47
48 static int timer_limit = DEFAULT_TIMER_LIMIT;
49 static int timer_tstamp_monotonic = 1;
50 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
51 MODULE_DESCRIPTION("ALSA timer interface");
52 MODULE_LICENSE("GPL");
53 module_param(timer_limit, int, 0444);
54 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
55 module_param(timer_tstamp_monotonic, int, 0444);
56 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
57
58 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
59 MODULE_ALIAS("devname:snd/timer");
60
61 struct snd_timer_user {
62 struct snd_timer_instance *timeri;
63 int tread; /* enhanced read with timestamps and events */
64 unsigned long ticks;
65 unsigned long overrun;
66 int qhead;
67 int qtail;
68 int qused;
69 int queue_size;
70 bool disconnected;
71 struct snd_timer_read *queue;
72 struct snd_timer_tread *tqueue;
73 spinlock_t qlock;
74 unsigned long last_resolution;
75 unsigned int filter;
76 struct timespec tstamp; /* trigger tstamp */
77 wait_queue_head_t qchange_sleep;
78 struct fasync_struct *fasync;
79 struct mutex ioctl_lock;
80 };
81
82 /* list of timers */
83 static LIST_HEAD(snd_timer_list);
84
85 /* list of slave instances */
86 static LIST_HEAD(snd_timer_slave_list);
87
88 /* lock for slave active lists */
89 static DEFINE_SPINLOCK(slave_active_lock);
90
91 static DEFINE_MUTEX(register_mutex);
92
93 static int snd_timer_free(struct snd_timer *timer);
94 static int snd_timer_dev_free(struct snd_device *device);
95 static int snd_timer_dev_register(struct snd_device *device);
96 static int snd_timer_dev_disconnect(struct snd_device *device);
97
98 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
99
100 /*
101 * create a timer instance with the given owner string.
102 * when timer is not NULL, increments the module counter
103 */
104 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
105 struct snd_timer *timer)
106 {
107 struct snd_timer_instance *timeri;
108 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
109 if (timeri == NULL)
110 return NULL;
111 timeri->owner = kstrdup(owner, GFP_KERNEL);
112 if (! timeri->owner) {
113 kfree(timeri);
114 return NULL;
115 }
116 INIT_LIST_HEAD(&timeri->open_list);
117 INIT_LIST_HEAD(&timeri->active_list);
118 INIT_LIST_HEAD(&timeri->ack_list);
119 INIT_LIST_HEAD(&timeri->slave_list_head);
120 INIT_LIST_HEAD(&timeri->slave_active_head);
121
122 timeri->timer = timer;
123 if (timer && !try_module_get(timer->module)) {
124 kfree(timeri->owner);
125 kfree(timeri);
126 return NULL;
127 }
128
129 return timeri;
130 }
131
132 /*
133 * find a timer instance from the given timer id
134 */
135 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
136 {
137 struct snd_timer *timer = NULL;
138
139 list_for_each_entry(timer, &snd_timer_list, device_list) {
140 if (timer->tmr_class != tid->dev_class)
141 continue;
142 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
143 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
144 (timer->card == NULL ||
145 timer->card->number != tid->card))
146 continue;
147 if (timer->tmr_device != tid->device)
148 continue;
149 if (timer->tmr_subdevice != tid->subdevice)
150 continue;
151 return timer;
152 }
153 return NULL;
154 }
155
156 #ifdef CONFIG_MODULES
157
158 static void snd_timer_request(struct snd_timer_id *tid)
159 {
160 switch (tid->dev_class) {
161 case SNDRV_TIMER_CLASS_GLOBAL:
162 if (tid->device < timer_limit)
163 request_module("snd-timer-%i", tid->device);
164 break;
165 case SNDRV_TIMER_CLASS_CARD:
166 case SNDRV_TIMER_CLASS_PCM:
167 if (tid->card < snd_ecards_limit)
168 request_module("snd-card-%i", tid->card);
169 break;
170 default:
171 break;
172 }
173 }
174
175 #endif
176
177 /*
178 * look for a master instance matching with the slave id of the given slave.
179 * when found, relink the open_link of the slave.
180 *
181 * call this with register_mutex down.
182 */
183 static int snd_timer_check_slave(struct snd_timer_instance *slave)
184 {
185 struct snd_timer *timer;
186 struct snd_timer_instance *master;
187
188 /* FIXME: it's really dumb to look up all entries.. */
189 list_for_each_entry(timer, &snd_timer_list, device_list) {
190 list_for_each_entry(master, &timer->open_list_head, open_list) {
191 if (slave->slave_class == master->slave_class &&
192 slave->slave_id == master->slave_id) {
193 if (master->timer->num_instances >=
194 master->timer->max_instances)
195 return -EBUSY;
196 list_move_tail(&slave->open_list,
197 &master->slave_list_head);
198 master->timer->num_instances++;
199 spin_lock_irq(&slave_active_lock);
200 slave->master = master;
201 slave->timer = master->timer;
202 spin_unlock_irq(&slave_active_lock);
203 return 0;
204 }
205 }
206 }
207 return 0;
208 }
209
210 /*
211 * look for slave instances matching with the slave id of the given master.
212 * when found, relink the open_link of slaves.
213 *
214 * call this with register_mutex down.
215 */
216 static int snd_timer_check_master(struct snd_timer_instance *master)
217 {
218 struct snd_timer_instance *slave, *tmp;
219
220 /* check all pending slaves */
221 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
222 if (slave->slave_class == master->slave_class &&
223 slave->slave_id == master->slave_id) {
224 if (master->timer->num_instances >=
225 master->timer->max_instances)
226 return -EBUSY;
227 list_move_tail(&slave->open_list, &master->slave_list_head);
228 master->timer->num_instances++;
229 spin_lock_irq(&slave_active_lock);
230 spin_lock(&master->timer->lock);
231 slave->master = master;
232 slave->timer = master->timer;
233 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
234 list_add_tail(&slave->active_list,
235 &master->slave_active_head);
236 spin_unlock(&master->timer->lock);
237 spin_unlock_irq(&slave_active_lock);
238 }
239 }
240 return 0;
241 }
242
243 static int snd_timer_close_locked(struct snd_timer_instance *timeri);
244
245 /*
246 * open a timer instance
247 * when opening a master, the slave id must be here given.
248 */
249 int snd_timer_open(struct snd_timer_instance **ti,
250 char *owner, struct snd_timer_id *tid,
251 unsigned int slave_id)
252 {
253 struct snd_timer *timer;
254 struct snd_timer_instance *timeri = NULL;
255 int err;
256
257 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
258 /* open a slave instance */
259 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
260 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
261 pr_debug("ALSA: timer: invalid slave class %i\n",
262 tid->dev_sclass);
263 return -EINVAL;
264 }
265 mutex_lock(&register_mutex);
266 timeri = snd_timer_instance_new(owner, NULL);
267 if (!timeri) {
268 mutex_unlock(&register_mutex);
269 return -ENOMEM;
270 }
271 timeri->slave_class = tid->dev_sclass;
272 timeri->slave_id = tid->device;
273 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
274 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
275 err = snd_timer_check_slave(timeri);
276 if (err < 0) {
277 snd_timer_close_locked(timeri);
278 timeri = NULL;
279 }
280 mutex_unlock(&register_mutex);
281 *ti = timeri;
282 return err;
283 }
284
285 /* open a master instance */
286 mutex_lock(&register_mutex);
287 timer = snd_timer_find(tid);
288 #ifdef CONFIG_MODULES
289 if (!timer) {
290 mutex_unlock(&register_mutex);
291 snd_timer_request(tid);
292 mutex_lock(&register_mutex);
293 timer = snd_timer_find(tid);
294 }
295 #endif
296 if (!timer) {
297 mutex_unlock(&register_mutex);
298 return -ENODEV;
299 }
300 if (!list_empty(&timer->open_list_head)) {
301 timeri = list_entry(timer->open_list_head.next,
302 struct snd_timer_instance, open_list);
303 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
304 mutex_unlock(&register_mutex);
305 return -EBUSY;
306 }
307 }
308 if (timer->num_instances >= timer->max_instances) {
309 mutex_unlock(&register_mutex);
310 return -EBUSY;
311 }
312 timeri = snd_timer_instance_new(owner, timer);
313 if (!timeri) {
314 mutex_unlock(&register_mutex);
315 return -ENOMEM;
316 }
317 /* take a card refcount for safe disconnection */
318 if (timer->card)
319 get_device(&timer->card->card_dev);
320 timeri->slave_class = tid->dev_sclass;
321 timeri->slave_id = slave_id;
322
323 if (list_empty(&timer->open_list_head) && timer->hw.open) {
324 int err = timer->hw.open(timer);
325 if (err) {
326 kfree(timeri->owner);
327 kfree(timeri);
328
329 if (timer->card)
330 put_device(&timer->card->card_dev);
331 module_put(timer->module);
332 mutex_unlock(&register_mutex);
333 return err;
334 }
335 }
336
337 list_add_tail(&timeri->open_list, &timer->open_list_head);
338 timer->num_instances++;
339 err = snd_timer_check_master(timeri);
340 if (err < 0) {
341 snd_timer_close_locked(timeri);
342 timeri = NULL;
343 }
344 mutex_unlock(&register_mutex);
345 *ti = timeri;
346 return err;
347 }
348 EXPORT_SYMBOL(snd_timer_open);
349
350 /*
351 * close a timer instance
352 * call this with register_mutex down.
353 */
354 static int snd_timer_close_locked(struct snd_timer_instance *timeri)
355 {
356 struct snd_timer *timer = NULL;
357 struct snd_timer_instance *slave, *tmp;
358
359 list_del(&timeri->open_list);
360
361 /* force to stop the timer */
362 snd_timer_stop(timeri);
363
364 timer = timeri->timer;
365 if (timer) {
366 timer->num_instances--;
367 /* wait, until the active callback is finished */
368 spin_lock_irq(&timer->lock);
369 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
370 spin_unlock_irq(&timer->lock);
371 udelay(10);
372 spin_lock_irq(&timer->lock);
373 }
374 spin_unlock_irq(&timer->lock);
375
376 /* remove slave links */
377 spin_lock_irq(&slave_active_lock);
378 spin_lock(&timer->lock);
379 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
380 open_list) {
381 list_move_tail(&slave->open_list, &snd_timer_slave_list);
382 timer->num_instances--;
383 slave->master = NULL;
384 slave->timer = NULL;
385 list_del_init(&slave->ack_list);
386 list_del_init(&slave->active_list);
387 }
388 spin_unlock(&timer->lock);
389 spin_unlock_irq(&slave_active_lock);
390
391 /* slave doesn't need to release timer resources below */
392 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
393 timer = NULL;
394 }
395
396 if (timeri->private_free)
397 timeri->private_free(timeri);
398 kfree(timeri->owner);
399 kfree(timeri);
400
401 if (timer) {
402 if (list_empty(&timer->open_list_head) && timer->hw.close)
403 timer->hw.close(timer);
404 /* release a card refcount for safe disconnection */
405 if (timer->card)
406 put_device(&timer->card->card_dev);
407 module_put(timer->module);
408 }
409
410 return 0;
411 }
412
413 /*
414 * close a timer instance
415 */
416 int snd_timer_close(struct snd_timer_instance *timeri)
417 {
418 int err;
419
420 if (snd_BUG_ON(!timeri))
421 return -ENXIO;
422
423 mutex_lock(&register_mutex);
424 err = snd_timer_close_locked(timeri);
425 mutex_unlock(&register_mutex);
426 return err;
427 }
428 EXPORT_SYMBOL(snd_timer_close);
429
430 static unsigned long snd_timer_hw_resolution(struct snd_timer *timer)
431 {
432 if (timer->hw.c_resolution)
433 return timer->hw.c_resolution(timer);
434 else
435 return timer->hw.resolution;
436 }
437
438 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
439 {
440 struct snd_timer * timer;
441 unsigned long ret = 0;
442 unsigned long flags;
443
444 if (timeri == NULL)
445 return 0;
446 timer = timeri->timer;
447 if (timer) {
448 spin_lock_irqsave(&timer->lock, flags);
449 ret = snd_timer_hw_resolution(timer);
450 spin_unlock_irqrestore(&timer->lock, flags);
451 }
452 return ret;
453 }
454 EXPORT_SYMBOL(snd_timer_resolution);
455
456 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
457 {
458 struct snd_timer *timer = ti->timer;
459 unsigned long resolution = 0;
460 struct snd_timer_instance *ts;
461 struct timespec tstamp;
462
463 if (timer_tstamp_monotonic)
464 ktime_get_ts(&tstamp);
465 else
466 getnstimeofday(&tstamp);
467 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
468 event > SNDRV_TIMER_EVENT_PAUSE))
469 return;
470 if (timer &&
471 (event == SNDRV_TIMER_EVENT_START ||
472 event == SNDRV_TIMER_EVENT_CONTINUE))
473 resolution = snd_timer_hw_resolution(timer);
474 if (ti->ccallback)
475 ti->ccallback(ti, event, &tstamp, resolution);
476 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
477 return;
478 if (timer == NULL)
479 return;
480 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
481 return;
482 list_for_each_entry(ts, &ti->slave_active_head, active_list)
483 if (ts->ccallback)
484 ts->ccallback(ts, event + 100, &tstamp, resolution);
485 }
486
487 /* start/continue a master timer */
488 static int snd_timer_start1(struct snd_timer_instance *timeri,
489 bool start, unsigned long ticks)
490 {
491 struct snd_timer *timer;
492 int result;
493 unsigned long flags;
494
495 timer = timeri->timer;
496 if (!timer)
497 return -EINVAL;
498
499 spin_lock_irqsave(&timer->lock, flags);
500 if (timer->card && timer->card->shutdown) {
501 result = -ENODEV;
502 goto unlock;
503 }
504 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
505 SNDRV_TIMER_IFLG_START)) {
506 result = -EBUSY;
507 goto unlock;
508 }
509
510 if (start)
511 timeri->ticks = timeri->cticks = ticks;
512 else if (!timeri->cticks)
513 timeri->cticks = 1;
514 timeri->pticks = 0;
515
516 list_move_tail(&timeri->active_list, &timer->active_list_head);
517 if (timer->running) {
518 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
519 goto __start_now;
520 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
521 timeri->flags |= SNDRV_TIMER_IFLG_START;
522 result = 1; /* delayed start */
523 } else {
524 if (start)
525 timer->sticks = ticks;
526 timer->hw.start(timer);
527 __start_now:
528 timer->running++;
529 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
530 result = 0;
531 }
532 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
533 SNDRV_TIMER_EVENT_CONTINUE);
534 unlock:
535 spin_unlock_irqrestore(&timer->lock, flags);
536 return result;
537 }
538
539 /* start/continue a slave timer */
540 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
541 bool start)
542 {
543 unsigned long flags;
544
545 spin_lock_irqsave(&slave_active_lock, flags);
546 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
547 spin_unlock_irqrestore(&slave_active_lock, flags);
548 return -EBUSY;
549 }
550 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
551 if (timeri->master && timeri->timer) {
552 spin_lock(&timeri->timer->lock);
553 list_add_tail(&timeri->active_list,
554 &timeri->master->slave_active_head);
555 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
556 SNDRV_TIMER_EVENT_CONTINUE);
557 spin_unlock(&timeri->timer->lock);
558 }
559 spin_unlock_irqrestore(&slave_active_lock, flags);
560 return 1; /* delayed start */
561 }
562
563 /* stop/pause a master timer */
564 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
565 {
566 struct snd_timer *timer;
567 int result = 0;
568 unsigned long flags;
569
570 timer = timeri->timer;
571 if (!timer)
572 return -EINVAL;
573 spin_lock_irqsave(&timer->lock, flags);
574 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
575 SNDRV_TIMER_IFLG_START))) {
576 result = -EBUSY;
577 goto unlock;
578 }
579 list_del_init(&timeri->ack_list);
580 list_del_init(&timeri->active_list);
581 if (timer->card && timer->card->shutdown)
582 goto unlock;
583 if (stop) {
584 timeri->cticks = timeri->ticks;
585 timeri->pticks = 0;
586 }
587 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
588 !(--timer->running)) {
589 timer->hw.stop(timer);
590 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
591 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
592 snd_timer_reschedule(timer, 0);
593 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
594 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
595 timer->hw.start(timer);
596 }
597 }
598 }
599 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
600 if (stop)
601 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
602 else
603 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
604 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
605 SNDRV_TIMER_EVENT_PAUSE);
606 unlock:
607 spin_unlock_irqrestore(&timer->lock, flags);
608 return result;
609 }
610
611 /* stop/pause a slave timer */
612 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
613 {
614 unsigned long flags;
615
616 spin_lock_irqsave(&slave_active_lock, flags);
617 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
618 spin_unlock_irqrestore(&slave_active_lock, flags);
619 return -EBUSY;
620 }
621 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
622 if (timeri->timer) {
623 spin_lock(&timeri->timer->lock);
624 list_del_init(&timeri->ack_list);
625 list_del_init(&timeri->active_list);
626 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
627 SNDRV_TIMER_EVENT_PAUSE);
628 spin_unlock(&timeri->timer->lock);
629 }
630 spin_unlock_irqrestore(&slave_active_lock, flags);
631 return 0;
632 }
633
634 /*
635 * start the timer instance
636 */
637 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
638 {
639 if (timeri == NULL || ticks < 1)
640 return -EINVAL;
641 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
642 return snd_timer_start_slave(timeri, true);
643 else
644 return snd_timer_start1(timeri, true, ticks);
645 }
646 EXPORT_SYMBOL(snd_timer_start);
647
648 /*
649 * stop the timer instance.
650 *
651 * do not call this from the timer callback!
652 */
653 int snd_timer_stop(struct snd_timer_instance *timeri)
654 {
655 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
656 return snd_timer_stop_slave(timeri, true);
657 else
658 return snd_timer_stop1(timeri, true);
659 }
660 EXPORT_SYMBOL(snd_timer_stop);
661
662 /*
663 * start again.. the tick is kept.
664 */
665 int snd_timer_continue(struct snd_timer_instance *timeri)
666 {
667 /* timer can continue only after pause */
668 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
669 return -EINVAL;
670
671 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
672 return snd_timer_start_slave(timeri, false);
673 else
674 return snd_timer_start1(timeri, false, 0);
675 }
676 EXPORT_SYMBOL(snd_timer_continue);
677
678 /*
679 * pause.. remember the ticks left
680 */
681 int snd_timer_pause(struct snd_timer_instance * timeri)
682 {
683 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
684 return snd_timer_stop_slave(timeri, false);
685 else
686 return snd_timer_stop1(timeri, false);
687 }
688 EXPORT_SYMBOL(snd_timer_pause);
689
690 /*
691 * reschedule the timer
692 *
693 * start pending instances and check the scheduling ticks.
694 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
695 */
696 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
697 {
698 struct snd_timer_instance *ti;
699 unsigned long ticks = ~0UL;
700
701 list_for_each_entry(ti, &timer->active_list_head, active_list) {
702 if (ti->flags & SNDRV_TIMER_IFLG_START) {
703 ti->flags &= ~SNDRV_TIMER_IFLG_START;
704 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
705 timer->running++;
706 }
707 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
708 if (ticks > ti->cticks)
709 ticks = ti->cticks;
710 }
711 }
712 if (ticks == ~0UL) {
713 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
714 return;
715 }
716 if (ticks > timer->hw.ticks)
717 ticks = timer->hw.ticks;
718 if (ticks_left != ticks)
719 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
720 timer->sticks = ticks;
721 }
722
723 /*
724 * timer tasklet
725 *
726 */
727 static void snd_timer_tasklet(unsigned long arg)
728 {
729 struct snd_timer *timer = (struct snd_timer *) arg;
730 struct snd_timer_instance *ti;
731 struct list_head *p;
732 unsigned long resolution, ticks;
733 unsigned long flags;
734
735 if (timer->card && timer->card->shutdown)
736 return;
737
738 spin_lock_irqsave(&timer->lock, flags);
739 /* now process all callbacks */
740 while (!list_empty(&timer->sack_list_head)) {
741 p = timer->sack_list_head.next; /* get first item */
742 ti = list_entry(p, struct snd_timer_instance, ack_list);
743
744 /* remove from ack_list and make empty */
745 list_del_init(p);
746
747 ticks = ti->pticks;
748 ti->pticks = 0;
749 resolution = ti->resolution;
750
751 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
752 spin_unlock(&timer->lock);
753 if (ti->callback)
754 ti->callback(ti, resolution, ticks);
755 spin_lock(&timer->lock);
756 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
757 }
758 spin_unlock_irqrestore(&timer->lock, flags);
759 }
760
761 /*
762 * timer interrupt
763 *
764 * ticks_left is usually equal to timer->sticks.
765 *
766 */
767 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
768 {
769 struct snd_timer_instance *ti, *ts, *tmp;
770 unsigned long resolution, ticks;
771 struct list_head *p, *ack_list_head;
772 unsigned long flags;
773 int use_tasklet = 0;
774
775 if (timer == NULL)
776 return;
777
778 if (timer->card && timer->card->shutdown)
779 return;
780
781 spin_lock_irqsave(&timer->lock, flags);
782
783 /* remember the current resolution */
784 resolution = snd_timer_hw_resolution(timer);
785
786 /* loop for all active instances
787 * Here we cannot use list_for_each_entry because the active_list of a
788 * processed instance is relinked to done_list_head before the callback
789 * is called.
790 */
791 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
792 active_list) {
793 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
794 continue;
795 ti->pticks += ticks_left;
796 ti->resolution = resolution;
797 if (ti->cticks < ticks_left)
798 ti->cticks = 0;
799 else
800 ti->cticks -= ticks_left;
801 if (ti->cticks) /* not expired */
802 continue;
803 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
804 ti->cticks = ti->ticks;
805 } else {
806 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
807 --timer->running;
808 list_del_init(&ti->active_list);
809 }
810 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
811 (ti->flags & SNDRV_TIMER_IFLG_FAST))
812 ack_list_head = &timer->ack_list_head;
813 else
814 ack_list_head = &timer->sack_list_head;
815 if (list_empty(&ti->ack_list))
816 list_add_tail(&ti->ack_list, ack_list_head);
817 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
818 ts->pticks = ti->pticks;
819 ts->resolution = resolution;
820 if (list_empty(&ts->ack_list))
821 list_add_tail(&ts->ack_list, ack_list_head);
822 }
823 }
824 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
825 snd_timer_reschedule(timer, timer->sticks);
826 if (timer->running) {
827 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
828 timer->hw.stop(timer);
829 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
830 }
831 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
832 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
833 /* restart timer */
834 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
835 timer->hw.start(timer);
836 }
837 } else {
838 timer->hw.stop(timer);
839 }
840
841 /* now process all fast callbacks */
842 while (!list_empty(&timer->ack_list_head)) {
843 p = timer->ack_list_head.next; /* get first item */
844 ti = list_entry(p, struct snd_timer_instance, ack_list);
845
846 /* remove from ack_list and make empty */
847 list_del_init(p);
848
849 ticks = ti->pticks;
850 ti->pticks = 0;
851
852 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
853 spin_unlock(&timer->lock);
854 if (ti->callback)
855 ti->callback(ti, resolution, ticks);
856 spin_lock(&timer->lock);
857 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
858 }
859
860 /* do we have any slow callbacks? */
861 use_tasklet = !list_empty(&timer->sack_list_head);
862 spin_unlock_irqrestore(&timer->lock, flags);
863
864 if (use_tasklet)
865 tasklet_schedule(&timer->task_queue);
866 }
867 EXPORT_SYMBOL(snd_timer_interrupt);
868
869 /*
870
871 */
872
873 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
874 struct snd_timer **rtimer)
875 {
876 struct snd_timer *timer;
877 int err;
878 static struct snd_device_ops ops = {
879 .dev_free = snd_timer_dev_free,
880 .dev_register = snd_timer_dev_register,
881 .dev_disconnect = snd_timer_dev_disconnect,
882 };
883
884 if (snd_BUG_ON(!tid))
885 return -EINVAL;
886 if (tid->dev_class == SNDRV_TIMER_CLASS_CARD ||
887 tid->dev_class == SNDRV_TIMER_CLASS_PCM) {
888 if (WARN_ON(!card))
889 return -EINVAL;
890 }
891 if (rtimer)
892 *rtimer = NULL;
893 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
894 if (!timer)
895 return -ENOMEM;
896 timer->tmr_class = tid->dev_class;
897 timer->card = card;
898 timer->tmr_device = tid->device;
899 timer->tmr_subdevice = tid->subdevice;
900 if (id)
901 strlcpy(timer->id, id, sizeof(timer->id));
902 timer->sticks = 1;
903 INIT_LIST_HEAD(&timer->device_list);
904 INIT_LIST_HEAD(&timer->open_list_head);
905 INIT_LIST_HEAD(&timer->active_list_head);
906 INIT_LIST_HEAD(&timer->ack_list_head);
907 INIT_LIST_HEAD(&timer->sack_list_head);
908 spin_lock_init(&timer->lock);
909 tasklet_init(&timer->task_queue, snd_timer_tasklet,
910 (unsigned long)timer);
911 timer->max_instances = 1000; /* default limit per timer */
912 if (card != NULL) {
913 timer->module = card->module;
914 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
915 if (err < 0) {
916 snd_timer_free(timer);
917 return err;
918 }
919 }
920 if (rtimer)
921 *rtimer = timer;
922 return 0;
923 }
924 EXPORT_SYMBOL(snd_timer_new);
925
926 static int snd_timer_free(struct snd_timer *timer)
927 {
928 if (!timer)
929 return 0;
930
931 mutex_lock(&register_mutex);
932 if (! list_empty(&timer->open_list_head)) {
933 struct list_head *p, *n;
934 struct snd_timer_instance *ti;
935 pr_warn("ALSA: timer %p is busy?\n", timer);
936 list_for_each_safe(p, n, &timer->open_list_head) {
937 list_del_init(p);
938 ti = list_entry(p, struct snd_timer_instance, open_list);
939 ti->timer = NULL;
940 }
941 }
942 list_del(&timer->device_list);
943 mutex_unlock(&register_mutex);
944
945 if (timer->private_free)
946 timer->private_free(timer);
947 kfree(timer);
948 return 0;
949 }
950
951 static int snd_timer_dev_free(struct snd_device *device)
952 {
953 struct snd_timer *timer = device->device_data;
954 return snd_timer_free(timer);
955 }
956
957 static int snd_timer_dev_register(struct snd_device *dev)
958 {
959 struct snd_timer *timer = dev->device_data;
960 struct snd_timer *timer1;
961
962 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
963 return -ENXIO;
964 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
965 !timer->hw.resolution && timer->hw.c_resolution == NULL)
966 return -EINVAL;
967
968 mutex_lock(&register_mutex);
969 list_for_each_entry(timer1, &snd_timer_list, device_list) {
970 if (timer1->tmr_class > timer->tmr_class)
971 break;
972 if (timer1->tmr_class < timer->tmr_class)
973 continue;
974 if (timer1->card && timer->card) {
975 if (timer1->card->number > timer->card->number)
976 break;
977 if (timer1->card->number < timer->card->number)
978 continue;
979 }
980 if (timer1->tmr_device > timer->tmr_device)
981 break;
982 if (timer1->tmr_device < timer->tmr_device)
983 continue;
984 if (timer1->tmr_subdevice > timer->tmr_subdevice)
985 break;
986 if (timer1->tmr_subdevice < timer->tmr_subdevice)
987 continue;
988 /* conflicts.. */
989 mutex_unlock(&register_mutex);
990 return -EBUSY;
991 }
992 list_add_tail(&timer->device_list, &timer1->device_list);
993 mutex_unlock(&register_mutex);
994 return 0;
995 }
996
997 static int snd_timer_dev_disconnect(struct snd_device *device)
998 {
999 struct snd_timer *timer = device->device_data;
1000 struct snd_timer_instance *ti;
1001
1002 mutex_lock(&register_mutex);
1003 list_del_init(&timer->device_list);
1004 /* wake up pending sleepers */
1005 list_for_each_entry(ti, &timer->open_list_head, open_list) {
1006 if (ti->disconnect)
1007 ti->disconnect(ti);
1008 }
1009 mutex_unlock(&register_mutex);
1010 return 0;
1011 }
1012
1013 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
1014 {
1015 unsigned long flags;
1016 unsigned long resolution = 0;
1017 struct snd_timer_instance *ti, *ts;
1018
1019 if (timer->card && timer->card->shutdown)
1020 return;
1021 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
1022 return;
1023 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
1024 event > SNDRV_TIMER_EVENT_MRESUME))
1025 return;
1026 spin_lock_irqsave(&timer->lock, flags);
1027 if (event == SNDRV_TIMER_EVENT_MSTART ||
1028 event == SNDRV_TIMER_EVENT_MCONTINUE ||
1029 event == SNDRV_TIMER_EVENT_MRESUME)
1030 resolution = snd_timer_hw_resolution(timer);
1031 list_for_each_entry(ti, &timer->active_list_head, active_list) {
1032 if (ti->ccallback)
1033 ti->ccallback(ti, event, tstamp, resolution);
1034 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1035 if (ts->ccallback)
1036 ts->ccallback(ts, event, tstamp, resolution);
1037 }
1038 spin_unlock_irqrestore(&timer->lock, flags);
1039 }
1040 EXPORT_SYMBOL(snd_timer_notify);
1041
1042 /*
1043 * exported functions for global timers
1044 */
1045 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1046 {
1047 struct snd_timer_id tid;
1048
1049 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1050 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1051 tid.card = -1;
1052 tid.device = device;
1053 tid.subdevice = 0;
1054 return snd_timer_new(NULL, id, &tid, rtimer);
1055 }
1056 EXPORT_SYMBOL(snd_timer_global_new);
1057
1058 int snd_timer_global_free(struct snd_timer *timer)
1059 {
1060 return snd_timer_free(timer);
1061 }
1062 EXPORT_SYMBOL(snd_timer_global_free);
1063
1064 int snd_timer_global_register(struct snd_timer *timer)
1065 {
1066 struct snd_device dev;
1067
1068 memset(&dev, 0, sizeof(dev));
1069 dev.device_data = timer;
1070 return snd_timer_dev_register(&dev);
1071 }
1072 EXPORT_SYMBOL(snd_timer_global_register);
1073
1074 /*
1075 * System timer
1076 */
1077
1078 struct snd_timer_system_private {
1079 struct timer_list tlist;
1080 struct snd_timer *snd_timer;
1081 unsigned long last_expires;
1082 unsigned long last_jiffies;
1083 unsigned long correction;
1084 };
1085
1086 static void snd_timer_s_function(struct timer_list *t)
1087 {
1088 struct snd_timer_system_private *priv = from_timer(priv, t,
1089 tlist);
1090 struct snd_timer *timer = priv->snd_timer;
1091 unsigned long jiff = jiffies;
1092 if (time_after(jiff, priv->last_expires))
1093 priv->correction += (long)jiff - (long)priv->last_expires;
1094 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1095 }
1096
1097 static int snd_timer_s_start(struct snd_timer * timer)
1098 {
1099 struct snd_timer_system_private *priv;
1100 unsigned long njiff;
1101
1102 priv = (struct snd_timer_system_private *) timer->private_data;
1103 njiff = (priv->last_jiffies = jiffies);
1104 if (priv->correction > timer->sticks - 1) {
1105 priv->correction -= timer->sticks - 1;
1106 njiff++;
1107 } else {
1108 njiff += timer->sticks - priv->correction;
1109 priv->correction = 0;
1110 }
1111 priv->last_expires = njiff;
1112 mod_timer(&priv->tlist, njiff);
1113 return 0;
1114 }
1115
1116 static int snd_timer_s_stop(struct snd_timer * timer)
1117 {
1118 struct snd_timer_system_private *priv;
1119 unsigned long jiff;
1120
1121 priv = (struct snd_timer_system_private *) timer->private_data;
1122 del_timer(&priv->tlist);
1123 jiff = jiffies;
1124 if (time_before(jiff, priv->last_expires))
1125 timer->sticks = priv->last_expires - jiff;
1126 else
1127 timer->sticks = 1;
1128 priv->correction = 0;
1129 return 0;
1130 }
1131
1132 static int snd_timer_s_close(struct snd_timer *timer)
1133 {
1134 struct snd_timer_system_private *priv;
1135
1136 priv = (struct snd_timer_system_private *)timer->private_data;
1137 del_timer_sync(&priv->tlist);
1138 return 0;
1139 }
1140
1141 static struct snd_timer_hardware snd_timer_system =
1142 {
1143 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1144 .resolution = 1000000000L / HZ,
1145 .ticks = 10000000L,
1146 .close = snd_timer_s_close,
1147 .start = snd_timer_s_start,
1148 .stop = snd_timer_s_stop
1149 };
1150
1151 static void snd_timer_free_system(struct snd_timer *timer)
1152 {
1153 kfree(timer->private_data);
1154 }
1155
1156 static int snd_timer_register_system(void)
1157 {
1158 struct snd_timer *timer;
1159 struct snd_timer_system_private *priv;
1160 int err;
1161
1162 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1163 if (err < 0)
1164 return err;
1165 strcpy(timer->name, "system timer");
1166 timer->hw = snd_timer_system;
1167 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1168 if (priv == NULL) {
1169 snd_timer_free(timer);
1170 return -ENOMEM;
1171 }
1172 priv->snd_timer = timer;
1173 timer_setup(&priv->tlist, snd_timer_s_function, 0);
1174 timer->private_data = priv;
1175 timer->private_free = snd_timer_free_system;
1176 return snd_timer_global_register(timer);
1177 }
1178
1179 #ifdef CONFIG_SND_PROC_FS
1180 /*
1181 * Info interface
1182 */
1183
1184 static void snd_timer_proc_read(struct snd_info_entry *entry,
1185 struct snd_info_buffer *buffer)
1186 {
1187 struct snd_timer *timer;
1188 struct snd_timer_instance *ti;
1189
1190 mutex_lock(&register_mutex);
1191 list_for_each_entry(timer, &snd_timer_list, device_list) {
1192 if (timer->card && timer->card->shutdown)
1193 continue;
1194 switch (timer->tmr_class) {
1195 case SNDRV_TIMER_CLASS_GLOBAL:
1196 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1197 break;
1198 case SNDRV_TIMER_CLASS_CARD:
1199 snd_iprintf(buffer, "C%i-%i: ",
1200 timer->card->number, timer->tmr_device);
1201 break;
1202 case SNDRV_TIMER_CLASS_PCM:
1203 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1204 timer->tmr_device, timer->tmr_subdevice);
1205 break;
1206 default:
1207 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1208 timer->card ? timer->card->number : -1,
1209 timer->tmr_device, timer->tmr_subdevice);
1210 }
1211 snd_iprintf(buffer, "%s :", timer->name);
1212 if (timer->hw.resolution)
1213 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1214 timer->hw.resolution / 1000,
1215 timer->hw.resolution % 1000,
1216 timer->hw.ticks);
1217 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1218 snd_iprintf(buffer, " SLAVE");
1219 snd_iprintf(buffer, "\n");
1220 list_for_each_entry(ti, &timer->open_list_head, open_list)
1221 snd_iprintf(buffer, " Client %s : %s\n",
1222 ti->owner ? ti->owner : "unknown",
1223 ti->flags & (SNDRV_TIMER_IFLG_START |
1224 SNDRV_TIMER_IFLG_RUNNING)
1225 ? "running" : "stopped");
1226 }
1227 mutex_unlock(&register_mutex);
1228 }
1229
1230 static struct snd_info_entry *snd_timer_proc_entry;
1231
1232 static void __init snd_timer_proc_init(void)
1233 {
1234 struct snd_info_entry *entry;
1235
1236 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1237 if (entry != NULL) {
1238 entry->c.text.read = snd_timer_proc_read;
1239 if (snd_info_register(entry) < 0) {
1240 snd_info_free_entry(entry);
1241 entry = NULL;
1242 }
1243 }
1244 snd_timer_proc_entry = entry;
1245 }
1246
1247 static void __exit snd_timer_proc_done(void)
1248 {
1249 snd_info_free_entry(snd_timer_proc_entry);
1250 }
1251 #else /* !CONFIG_SND_PROC_FS */
1252 #define snd_timer_proc_init()
1253 #define snd_timer_proc_done()
1254 #endif
1255
1256 /*
1257 * USER SPACE interface
1258 */
1259
1260 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1261 unsigned long resolution,
1262 unsigned long ticks)
1263 {
1264 struct snd_timer_user *tu = timeri->callback_data;
1265 struct snd_timer_read *r;
1266 int prev;
1267
1268 spin_lock(&tu->qlock);
1269 if (tu->qused > 0) {
1270 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1271 r = &tu->queue[prev];
1272 if (r->resolution == resolution) {
1273 r->ticks += ticks;
1274 goto __wake;
1275 }
1276 }
1277 if (tu->qused >= tu->queue_size) {
1278 tu->overrun++;
1279 } else {
1280 r = &tu->queue[tu->qtail++];
1281 tu->qtail %= tu->queue_size;
1282 r->resolution = resolution;
1283 r->ticks = ticks;
1284 tu->qused++;
1285 }
1286 __wake:
1287 spin_unlock(&tu->qlock);
1288 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1289 wake_up(&tu->qchange_sleep);
1290 }
1291
1292 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1293 struct snd_timer_tread *tread)
1294 {
1295 if (tu->qused >= tu->queue_size) {
1296 tu->overrun++;
1297 } else {
1298 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1299 tu->qtail %= tu->queue_size;
1300 tu->qused++;
1301 }
1302 }
1303
1304 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1305 int event,
1306 struct timespec *tstamp,
1307 unsigned long resolution)
1308 {
1309 struct snd_timer_user *tu = timeri->callback_data;
1310 struct snd_timer_tread r1;
1311 unsigned long flags;
1312
1313 if (event >= SNDRV_TIMER_EVENT_START &&
1314 event <= SNDRV_TIMER_EVENT_PAUSE)
1315 tu->tstamp = *tstamp;
1316 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1317 return;
1318 memset(&r1, 0, sizeof(r1));
1319 r1.event = event;
1320 r1.tstamp = *tstamp;
1321 r1.val = resolution;
1322 spin_lock_irqsave(&tu->qlock, flags);
1323 snd_timer_user_append_to_tqueue(tu, &r1);
1324 spin_unlock_irqrestore(&tu->qlock, flags);
1325 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1326 wake_up(&tu->qchange_sleep);
1327 }
1328
1329 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1330 {
1331 struct snd_timer_user *tu = timeri->callback_data;
1332
1333 tu->disconnected = true;
1334 wake_up(&tu->qchange_sleep);
1335 }
1336
1337 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1338 unsigned long resolution,
1339 unsigned long ticks)
1340 {
1341 struct snd_timer_user *tu = timeri->callback_data;
1342 struct snd_timer_tread *r, r1;
1343 struct timespec tstamp;
1344 int prev, append = 0;
1345
1346 memset(&r1, 0, sizeof(r1));
1347 memset(&tstamp, 0, sizeof(tstamp));
1348 spin_lock(&tu->qlock);
1349 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1350 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1351 spin_unlock(&tu->qlock);
1352 return;
1353 }
1354 if (tu->last_resolution != resolution || ticks > 0) {
1355 if (timer_tstamp_monotonic)
1356 ktime_get_ts(&tstamp);
1357 else
1358 getnstimeofday(&tstamp);
1359 }
1360 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1361 tu->last_resolution != resolution) {
1362 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1363 r1.tstamp = tstamp;
1364 r1.val = resolution;
1365 snd_timer_user_append_to_tqueue(tu, &r1);
1366 tu->last_resolution = resolution;
1367 append++;
1368 }
1369 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1370 goto __wake;
1371 if (ticks == 0)
1372 goto __wake;
1373 if (tu->qused > 0) {
1374 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1375 r = &tu->tqueue[prev];
1376 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1377 r->tstamp = tstamp;
1378 r->val += ticks;
1379 append++;
1380 goto __wake;
1381 }
1382 }
1383 r1.event = SNDRV_TIMER_EVENT_TICK;
1384 r1.tstamp = tstamp;
1385 r1.val = ticks;
1386 snd_timer_user_append_to_tqueue(tu, &r1);
1387 append++;
1388 __wake:
1389 spin_unlock(&tu->qlock);
1390 if (append == 0)
1391 return;
1392 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1393 wake_up(&tu->qchange_sleep);
1394 }
1395
1396 static int realloc_user_queue(struct snd_timer_user *tu, int size)
1397 {
1398 struct snd_timer_read *queue = NULL;
1399 struct snd_timer_tread *tqueue = NULL;
1400
1401 if (tu->tread) {
1402 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1403 if (!tqueue)
1404 return -ENOMEM;
1405 } else {
1406 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1407 if (!queue)
1408 return -ENOMEM;
1409 }
1410
1411 spin_lock_irq(&tu->qlock);
1412 kfree(tu->queue);
1413 kfree(tu->tqueue);
1414 tu->queue_size = size;
1415 tu->queue = queue;
1416 tu->tqueue = tqueue;
1417 tu->qhead = tu->qtail = tu->qused = 0;
1418 spin_unlock_irq(&tu->qlock);
1419
1420 return 0;
1421 }
1422
1423 static int snd_timer_user_open(struct inode *inode, struct file *file)
1424 {
1425 struct snd_timer_user *tu;
1426 int err;
1427
1428 err = nonseekable_open(inode, file);
1429 if (err < 0)
1430 return err;
1431
1432 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1433 if (tu == NULL)
1434 return -ENOMEM;
1435 spin_lock_init(&tu->qlock);
1436 init_waitqueue_head(&tu->qchange_sleep);
1437 mutex_init(&tu->ioctl_lock);
1438 tu->ticks = 1;
1439 if (realloc_user_queue(tu, 128) < 0) {
1440 kfree(tu);
1441 return -ENOMEM;
1442 }
1443 file->private_data = tu;
1444 return 0;
1445 }
1446
1447 static int snd_timer_user_release(struct inode *inode, struct file *file)
1448 {
1449 struct snd_timer_user *tu;
1450
1451 if (file->private_data) {
1452 tu = file->private_data;
1453 file->private_data = NULL;
1454 mutex_lock(&tu->ioctl_lock);
1455 if (tu->timeri)
1456 snd_timer_close(tu->timeri);
1457 mutex_unlock(&tu->ioctl_lock);
1458 kfree(tu->queue);
1459 kfree(tu->tqueue);
1460 kfree(tu);
1461 }
1462 return 0;
1463 }
1464
1465 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1466 {
1467 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1468 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1469 id->card = -1;
1470 id->device = -1;
1471 id->subdevice = -1;
1472 }
1473
1474 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1475 {
1476 id->dev_class = timer->tmr_class;
1477 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1478 id->card = timer->card ? timer->card->number : -1;
1479 id->device = timer->tmr_device;
1480 id->subdevice = timer->tmr_subdevice;
1481 }
1482
1483 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1484 {
1485 struct snd_timer_id id;
1486 struct snd_timer *timer;
1487 struct list_head *p;
1488
1489 if (copy_from_user(&id, _tid, sizeof(id)))
1490 return -EFAULT;
1491 mutex_lock(&register_mutex);
1492 if (id.dev_class < 0) { /* first item */
1493 if (list_empty(&snd_timer_list))
1494 snd_timer_user_zero_id(&id);
1495 else {
1496 timer = list_entry(snd_timer_list.next,
1497 struct snd_timer, device_list);
1498 snd_timer_user_copy_id(&id, timer);
1499 }
1500 } else {
1501 switch (id.dev_class) {
1502 case SNDRV_TIMER_CLASS_GLOBAL:
1503 id.device = id.device < 0 ? 0 : id.device + 1;
1504 list_for_each(p, &snd_timer_list) {
1505 timer = list_entry(p, struct snd_timer, device_list);
1506 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1507 snd_timer_user_copy_id(&id, timer);
1508 break;
1509 }
1510 if (timer->tmr_device >= id.device) {
1511 snd_timer_user_copy_id(&id, timer);
1512 break;
1513 }
1514 }
1515 if (p == &snd_timer_list)
1516 snd_timer_user_zero_id(&id);
1517 break;
1518 case SNDRV_TIMER_CLASS_CARD:
1519 case SNDRV_TIMER_CLASS_PCM:
1520 if (id.card < 0) {
1521 id.card = 0;
1522 } else {
1523 if (id.device < 0) {
1524 id.device = 0;
1525 } else {
1526 if (id.subdevice < 0)
1527 id.subdevice = 0;
1528 else if (id.subdevice < INT_MAX)
1529 id.subdevice++;
1530 }
1531 }
1532 list_for_each(p, &snd_timer_list) {
1533 timer = list_entry(p, struct snd_timer, device_list);
1534 if (timer->tmr_class > id.dev_class) {
1535 snd_timer_user_copy_id(&id, timer);
1536 break;
1537 }
1538 if (timer->tmr_class < id.dev_class)
1539 continue;
1540 if (timer->card->number > id.card) {
1541 snd_timer_user_copy_id(&id, timer);
1542 break;
1543 }
1544 if (timer->card->number < id.card)
1545 continue;
1546 if (timer->tmr_device > id.device) {
1547 snd_timer_user_copy_id(&id, timer);
1548 break;
1549 }
1550 if (timer->tmr_device < id.device)
1551 continue;
1552 if (timer->tmr_subdevice > id.subdevice) {
1553 snd_timer_user_copy_id(&id, timer);
1554 break;
1555 }
1556 if (timer->tmr_subdevice < id.subdevice)
1557 continue;
1558 snd_timer_user_copy_id(&id, timer);
1559 break;
1560 }
1561 if (p == &snd_timer_list)
1562 snd_timer_user_zero_id(&id);
1563 break;
1564 default:
1565 snd_timer_user_zero_id(&id);
1566 }
1567 }
1568 mutex_unlock(&register_mutex);
1569 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1570 return -EFAULT;
1571 return 0;
1572 }
1573
1574 static int snd_timer_user_ginfo(struct file *file,
1575 struct snd_timer_ginfo __user *_ginfo)
1576 {
1577 struct snd_timer_ginfo *ginfo;
1578 struct snd_timer_id tid;
1579 struct snd_timer *t;
1580 struct list_head *p;
1581 int err = 0;
1582
1583 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1584 if (IS_ERR(ginfo))
1585 return PTR_ERR(ginfo);
1586
1587 tid = ginfo->tid;
1588 memset(ginfo, 0, sizeof(*ginfo));
1589 ginfo->tid = tid;
1590 mutex_lock(&register_mutex);
1591 t = snd_timer_find(&tid);
1592 if (t != NULL) {
1593 ginfo->card = t->card ? t->card->number : -1;
1594 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1595 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1596 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1597 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1598 ginfo->resolution = t->hw.resolution;
1599 if (t->hw.resolution_min > 0) {
1600 ginfo->resolution_min = t->hw.resolution_min;
1601 ginfo->resolution_max = t->hw.resolution_max;
1602 }
1603 list_for_each(p, &t->open_list_head) {
1604 ginfo->clients++;
1605 }
1606 } else {
1607 err = -ENODEV;
1608 }
1609 mutex_unlock(&register_mutex);
1610 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1611 err = -EFAULT;
1612 kfree(ginfo);
1613 return err;
1614 }
1615
1616 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1617 {
1618 struct snd_timer *t;
1619 int err;
1620
1621 mutex_lock(&register_mutex);
1622 t = snd_timer_find(&gparams->tid);
1623 if (!t) {
1624 err = -ENODEV;
1625 goto _error;
1626 }
1627 if (!list_empty(&t->open_list_head)) {
1628 err = -EBUSY;
1629 goto _error;
1630 }
1631 if (!t->hw.set_period) {
1632 err = -ENOSYS;
1633 goto _error;
1634 }
1635 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1636 _error:
1637 mutex_unlock(&register_mutex);
1638 return err;
1639 }
1640
1641 static int snd_timer_user_gparams(struct file *file,
1642 struct snd_timer_gparams __user *_gparams)
1643 {
1644 struct snd_timer_gparams gparams;
1645
1646 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1647 return -EFAULT;
1648 return timer_set_gparams(&gparams);
1649 }
1650
1651 static int snd_timer_user_gstatus(struct file *file,
1652 struct snd_timer_gstatus __user *_gstatus)
1653 {
1654 struct snd_timer_gstatus gstatus;
1655 struct snd_timer_id tid;
1656 struct snd_timer *t;
1657 int err = 0;
1658
1659 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1660 return -EFAULT;
1661 tid = gstatus.tid;
1662 memset(&gstatus, 0, sizeof(gstatus));
1663 gstatus.tid = tid;
1664 mutex_lock(&register_mutex);
1665 t = snd_timer_find(&tid);
1666 if (t != NULL) {
1667 spin_lock_irq(&t->lock);
1668 gstatus.resolution = snd_timer_hw_resolution(t);
1669 if (t->hw.precise_resolution) {
1670 t->hw.precise_resolution(t, &gstatus.resolution_num,
1671 &gstatus.resolution_den);
1672 } else {
1673 gstatus.resolution_num = gstatus.resolution;
1674 gstatus.resolution_den = 1000000000uL;
1675 }
1676 spin_unlock_irq(&t->lock);
1677 } else {
1678 err = -ENODEV;
1679 }
1680 mutex_unlock(&register_mutex);
1681 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1682 err = -EFAULT;
1683 return err;
1684 }
1685
1686 static int snd_timer_user_tselect(struct file *file,
1687 struct snd_timer_select __user *_tselect)
1688 {
1689 struct snd_timer_user *tu;
1690 struct snd_timer_select tselect;
1691 char str[32];
1692 int err = 0;
1693
1694 tu = file->private_data;
1695 if (tu->timeri) {
1696 snd_timer_close(tu->timeri);
1697 tu->timeri = NULL;
1698 }
1699 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1700 err = -EFAULT;
1701 goto __err;
1702 }
1703 sprintf(str, "application %i", current->pid);
1704 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1705 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1706 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1707 if (err < 0)
1708 goto __err;
1709
1710 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1711 tu->timeri->callback = tu->tread
1712 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1713 tu->timeri->ccallback = snd_timer_user_ccallback;
1714 tu->timeri->callback_data = (void *)tu;
1715 tu->timeri->disconnect = snd_timer_user_disconnect;
1716
1717 __err:
1718 return err;
1719 }
1720
1721 static int snd_timer_user_info(struct file *file,
1722 struct snd_timer_info __user *_info)
1723 {
1724 struct snd_timer_user *tu;
1725 struct snd_timer_info *info;
1726 struct snd_timer *t;
1727 int err = 0;
1728
1729 tu = file->private_data;
1730 if (!tu->timeri)
1731 return -EBADFD;
1732 t = tu->timeri->timer;
1733 if (!t)
1734 return -EBADFD;
1735
1736 info = kzalloc(sizeof(*info), GFP_KERNEL);
1737 if (! info)
1738 return -ENOMEM;
1739 info->card = t->card ? t->card->number : -1;
1740 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1741 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1742 strlcpy(info->id, t->id, sizeof(info->id));
1743 strlcpy(info->name, t->name, sizeof(info->name));
1744 info->resolution = t->hw.resolution;
1745 if (copy_to_user(_info, info, sizeof(*_info)))
1746 err = -EFAULT;
1747 kfree(info);
1748 return err;
1749 }
1750
1751 static int snd_timer_user_params(struct file *file,
1752 struct snd_timer_params __user *_params)
1753 {
1754 struct snd_timer_user *tu;
1755 struct snd_timer_params params;
1756 struct snd_timer *t;
1757 int err;
1758
1759 tu = file->private_data;
1760 if (!tu->timeri)
1761 return -EBADFD;
1762 t = tu->timeri->timer;
1763 if (!t)
1764 return -EBADFD;
1765 if (copy_from_user(&params, _params, sizeof(params)))
1766 return -EFAULT;
1767 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1768 u64 resolution;
1769
1770 if (params.ticks < 1) {
1771 err = -EINVAL;
1772 goto _end;
1773 }
1774
1775 /* Don't allow resolution less than 1ms */
1776 resolution = snd_timer_resolution(tu->timeri);
1777 resolution *= params.ticks;
1778 if (resolution < 1000000) {
1779 err = -EINVAL;
1780 goto _end;
1781 }
1782 }
1783 if (params.queue_size > 0 &&
1784 (params.queue_size < 32 || params.queue_size > 1024)) {
1785 err = -EINVAL;
1786 goto _end;
1787 }
1788 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1789 (1<<SNDRV_TIMER_EVENT_TICK)|
1790 (1<<SNDRV_TIMER_EVENT_START)|
1791 (1<<SNDRV_TIMER_EVENT_STOP)|
1792 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1793 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1794 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1795 (1<<SNDRV_TIMER_EVENT_RESUME)|
1796 (1<<SNDRV_TIMER_EVENT_MSTART)|
1797 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1798 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1799 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1800 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1801 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1802 err = -EINVAL;
1803 goto _end;
1804 }
1805 snd_timer_stop(tu->timeri);
1806 spin_lock_irq(&t->lock);
1807 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1808 SNDRV_TIMER_IFLG_EXCLUSIVE|
1809 SNDRV_TIMER_IFLG_EARLY_EVENT);
1810 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1811 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1812 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1813 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1814 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1815 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1816 spin_unlock_irq(&t->lock);
1817 if (params.queue_size > 0 &&
1818 (unsigned int)tu->queue_size != params.queue_size) {
1819 err = realloc_user_queue(tu, params.queue_size);
1820 if (err < 0)
1821 goto _end;
1822 }
1823 spin_lock_irq(&tu->qlock);
1824 tu->qhead = tu->qtail = tu->qused = 0;
1825 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1826 if (tu->tread) {
1827 struct snd_timer_tread tread;
1828 memset(&tread, 0, sizeof(tread));
1829 tread.event = SNDRV_TIMER_EVENT_EARLY;
1830 tread.tstamp.tv_sec = 0;
1831 tread.tstamp.tv_nsec = 0;
1832 tread.val = 0;
1833 snd_timer_user_append_to_tqueue(tu, &tread);
1834 } else {
1835 struct snd_timer_read *r = &tu->queue[0];
1836 r->resolution = 0;
1837 r->ticks = 0;
1838 tu->qused++;
1839 tu->qtail++;
1840 }
1841 }
1842 tu->filter = params.filter;
1843 tu->ticks = params.ticks;
1844 spin_unlock_irq(&tu->qlock);
1845 err = 0;
1846 _end:
1847 if (copy_to_user(_params, &params, sizeof(params)))
1848 return -EFAULT;
1849 return err;
1850 }
1851
1852 static int snd_timer_user_status(struct file *file,
1853 struct snd_timer_status __user *_status)
1854 {
1855 struct snd_timer_user *tu;
1856 struct snd_timer_status status;
1857
1858 tu = file->private_data;
1859 if (!tu->timeri)
1860 return -EBADFD;
1861 memset(&status, 0, sizeof(status));
1862 status.tstamp = tu->tstamp;
1863 status.resolution = snd_timer_resolution(tu->timeri);
1864 status.lost = tu->timeri->lost;
1865 status.overrun = tu->overrun;
1866 spin_lock_irq(&tu->qlock);
1867 status.queue = tu->qused;
1868 spin_unlock_irq(&tu->qlock);
1869 if (copy_to_user(_status, &status, sizeof(status)))
1870 return -EFAULT;
1871 return 0;
1872 }
1873
1874 static int snd_timer_user_start(struct file *file)
1875 {
1876 int err;
1877 struct snd_timer_user *tu;
1878
1879 tu = file->private_data;
1880 if (!tu->timeri)
1881 return -EBADFD;
1882 snd_timer_stop(tu->timeri);
1883 tu->timeri->lost = 0;
1884 tu->last_resolution = 0;
1885 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1886 }
1887
1888 static int snd_timer_user_stop(struct file *file)
1889 {
1890 int err;
1891 struct snd_timer_user *tu;
1892
1893 tu = file->private_data;
1894 if (!tu->timeri)
1895 return -EBADFD;
1896 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1897 }
1898
1899 static int snd_timer_user_continue(struct file *file)
1900 {
1901 int err;
1902 struct snd_timer_user *tu;
1903
1904 tu = file->private_data;
1905 if (!tu->timeri)
1906 return -EBADFD;
1907 /* start timer instead of continue if it's not used before */
1908 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1909 return snd_timer_user_start(file);
1910 tu->timeri->lost = 0;
1911 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1912 }
1913
1914 static int snd_timer_user_pause(struct file *file)
1915 {
1916 int err;
1917 struct snd_timer_user *tu;
1918
1919 tu = file->private_data;
1920 if (!tu->timeri)
1921 return -EBADFD;
1922 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1923 }
1924
1925 enum {
1926 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1927 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1928 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1929 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1930 };
1931
1932 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1933 unsigned long arg)
1934 {
1935 struct snd_timer_user *tu;
1936 void __user *argp = (void __user *)arg;
1937 int __user *p = argp;
1938
1939 tu = file->private_data;
1940 switch (cmd) {
1941 case SNDRV_TIMER_IOCTL_PVERSION:
1942 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1943 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1944 return snd_timer_user_next_device(argp);
1945 case SNDRV_TIMER_IOCTL_TREAD:
1946 {
1947 int xarg, old_tread;
1948
1949 if (tu->timeri) /* too late */
1950 return -EBUSY;
1951 if (get_user(xarg, p))
1952 return -EFAULT;
1953 old_tread = tu->tread;
1954 tu->tread = xarg ? 1 : 0;
1955 if (tu->tread != old_tread &&
1956 realloc_user_queue(tu, tu->queue_size) < 0) {
1957 tu->tread = old_tread;
1958 return -ENOMEM;
1959 }
1960 return 0;
1961 }
1962 case SNDRV_TIMER_IOCTL_GINFO:
1963 return snd_timer_user_ginfo(file, argp);
1964 case SNDRV_TIMER_IOCTL_GPARAMS:
1965 return snd_timer_user_gparams(file, argp);
1966 case SNDRV_TIMER_IOCTL_GSTATUS:
1967 return snd_timer_user_gstatus(file, argp);
1968 case SNDRV_TIMER_IOCTL_SELECT:
1969 return snd_timer_user_tselect(file, argp);
1970 case SNDRV_TIMER_IOCTL_INFO:
1971 return snd_timer_user_info(file, argp);
1972 case SNDRV_TIMER_IOCTL_PARAMS:
1973 return snd_timer_user_params(file, argp);
1974 case SNDRV_TIMER_IOCTL_STATUS:
1975 return snd_timer_user_status(file, argp);
1976 case SNDRV_TIMER_IOCTL_START:
1977 case SNDRV_TIMER_IOCTL_START_OLD:
1978 return snd_timer_user_start(file);
1979 case SNDRV_TIMER_IOCTL_STOP:
1980 case SNDRV_TIMER_IOCTL_STOP_OLD:
1981 return snd_timer_user_stop(file);
1982 case SNDRV_TIMER_IOCTL_CONTINUE:
1983 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1984 return snd_timer_user_continue(file);
1985 case SNDRV_TIMER_IOCTL_PAUSE:
1986 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1987 return snd_timer_user_pause(file);
1988 }
1989 return -ENOTTY;
1990 }
1991
1992 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1993 unsigned long arg)
1994 {
1995 struct snd_timer_user *tu = file->private_data;
1996 long ret;
1997
1998 mutex_lock(&tu->ioctl_lock);
1999 ret = __snd_timer_user_ioctl(file, cmd, arg);
2000 mutex_unlock(&tu->ioctl_lock);
2001 return ret;
2002 }
2003
2004 static int snd_timer_user_fasync(int fd, struct file * file, int on)
2005 {
2006 struct snd_timer_user *tu;
2007
2008 tu = file->private_data;
2009 return fasync_helper(fd, file, on, &tu->fasync);
2010 }
2011
2012 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
2013 size_t count, loff_t *offset)
2014 {
2015 struct snd_timer_user *tu;
2016 long result = 0, unit;
2017 int qhead;
2018 int err = 0;
2019
2020 tu = file->private_data;
2021 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
2022 mutex_lock(&tu->ioctl_lock);
2023 spin_lock_irq(&tu->qlock);
2024 while ((long)count - result >= unit) {
2025 while (!tu->qused) {
2026 wait_queue_entry_t wait;
2027
2028 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
2029 err = -EAGAIN;
2030 goto _error;
2031 }
2032
2033 set_current_state(TASK_INTERRUPTIBLE);
2034 init_waitqueue_entry(&wait, current);
2035 add_wait_queue(&tu->qchange_sleep, &wait);
2036
2037 spin_unlock_irq(&tu->qlock);
2038 mutex_unlock(&tu->ioctl_lock);
2039 schedule();
2040 mutex_lock(&tu->ioctl_lock);
2041 spin_lock_irq(&tu->qlock);
2042
2043 remove_wait_queue(&tu->qchange_sleep, &wait);
2044
2045 if (tu->disconnected) {
2046 err = -ENODEV;
2047 goto _error;
2048 }
2049 if (signal_pending(current)) {
2050 err = -ERESTARTSYS;
2051 goto _error;
2052 }
2053 }
2054
2055 qhead = tu->qhead++;
2056 tu->qhead %= tu->queue_size;
2057 tu->qused--;
2058 spin_unlock_irq(&tu->qlock);
2059
2060 if (tu->tread) {
2061 if (copy_to_user(buffer, &tu->tqueue[qhead],
2062 sizeof(struct snd_timer_tread)))
2063 err = -EFAULT;
2064 } else {
2065 if (copy_to_user(buffer, &tu->queue[qhead],
2066 sizeof(struct snd_timer_read)))
2067 err = -EFAULT;
2068 }
2069
2070 spin_lock_irq(&tu->qlock);
2071 if (err < 0)
2072 goto _error;
2073 result += unit;
2074 buffer += unit;
2075 }
2076 _error:
2077 spin_unlock_irq(&tu->qlock);
2078 mutex_unlock(&tu->ioctl_lock);
2079 return result > 0 ? result : err;
2080 }
2081
2082 static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait)
2083 {
2084 __poll_t mask;
2085 struct snd_timer_user *tu;
2086
2087 tu = file->private_data;
2088
2089 poll_wait(file, &tu->qchange_sleep, wait);
2090
2091 mask = 0;
2092 spin_lock_irq(&tu->qlock);
2093 if (tu->qused)
2094 mask |= EPOLLIN | EPOLLRDNORM;
2095 if (tu->disconnected)
2096 mask |= EPOLLERR;
2097 spin_unlock_irq(&tu->qlock);
2098
2099 return mask;
2100 }
2101
2102 #ifdef CONFIG_COMPAT
2103 #include "timer_compat.c"
2104 #else
2105 #define snd_timer_user_ioctl_compat NULL
2106 #endif
2107
2108 static const struct file_operations snd_timer_f_ops =
2109 {
2110 .owner = THIS_MODULE,
2111 .read = snd_timer_user_read,
2112 .open = snd_timer_user_open,
2113 .release = snd_timer_user_release,
2114 .llseek = no_llseek,
2115 .poll = snd_timer_user_poll,
2116 .unlocked_ioctl = snd_timer_user_ioctl,
2117 .compat_ioctl = snd_timer_user_ioctl_compat,
2118 .fasync = snd_timer_user_fasync,
2119 };
2120
2121 /* unregister the system timer */
2122 static void snd_timer_free_all(void)
2123 {
2124 struct snd_timer *timer, *n;
2125
2126 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2127 snd_timer_free(timer);
2128 }
2129
2130 static struct device timer_dev;
2131
2132 /*
2133 * ENTRY functions
2134 */
2135
2136 static int __init alsa_timer_init(void)
2137 {
2138 int err;
2139
2140 snd_device_initialize(&timer_dev, NULL);
2141 dev_set_name(&timer_dev, "timer");
2142
2143 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2144 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2145 "system timer");
2146 #endif
2147
2148 err = snd_timer_register_system();
2149 if (err < 0) {
2150 pr_err("ALSA: unable to register system timer (%i)\n", err);
2151 goto put_timer;
2152 }
2153
2154 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2155 &snd_timer_f_ops, NULL, &timer_dev);
2156 if (err < 0) {
2157 pr_err("ALSA: unable to register timer device (%i)\n", err);
2158 snd_timer_free_all();
2159 goto put_timer;
2160 }
2161
2162 snd_timer_proc_init();
2163 return 0;
2164
2165 put_timer:
2166 put_device(&timer_dev);
2167 return err;
2168 }
2169
2170 static void __exit alsa_timer_exit(void)
2171 {
2172 snd_unregister_device(&timer_dev);
2173 snd_timer_free_all();
2174 put_device(&timer_dev);
2175 snd_timer_proc_done();
2176 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2177 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2178 #endif
2179 }
2180
2181 module_init(alsa_timer_init)
2182 module_exit(alsa_timer_exit)
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