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Linux 4.15.6
[linux/fpc-iii.git] / sound / core / timer.c
blobee09dace8bb1eefdec0c8bcc398b0c521fc536ac
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 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
431 {
432 struct snd_timer * timer;
433
434 if (timeri == NULL)
435 return 0;
436 timer = timeri->timer;
437 if (timer) {
438 if (timer->hw.c_resolution)
439 return timer->hw.c_resolution(timer);
440 return timer->hw.resolution;
441 }
442 return 0;
443 }
444 EXPORT_SYMBOL(snd_timer_resolution);
445
446 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
447 {
448 struct snd_timer *timer;
449 unsigned long resolution = 0;
450 struct snd_timer_instance *ts;
451 struct timespec tstamp;
452
453 if (timer_tstamp_monotonic)
454 ktime_get_ts(&tstamp);
455 else
456 getnstimeofday(&tstamp);
457 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
458 event > SNDRV_TIMER_EVENT_PAUSE))
459 return;
460 if (event == SNDRV_TIMER_EVENT_START ||
461 event == SNDRV_TIMER_EVENT_CONTINUE)
462 resolution = snd_timer_resolution(ti);
463 if (ti->ccallback)
464 ti->ccallback(ti, event, &tstamp, resolution);
465 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
466 return;
467 timer = ti->timer;
468 if (timer == NULL)
469 return;
470 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
471 return;
472 list_for_each_entry(ts, &ti->slave_active_head, active_list)
473 if (ts->ccallback)
474 ts->ccallback(ts, event + 100, &tstamp, resolution);
475 }
476
477 /* start/continue a master timer */
478 static int snd_timer_start1(struct snd_timer_instance *timeri,
479 bool start, unsigned long ticks)
480 {
481 struct snd_timer *timer;
482 int result;
483 unsigned long flags;
484
485 timer = timeri->timer;
486 if (!timer)
487 return -EINVAL;
488
489 spin_lock_irqsave(&timer->lock, flags);
490 if (timer->card && timer->card->shutdown) {
491 result = -ENODEV;
492 goto unlock;
493 }
494 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
495 SNDRV_TIMER_IFLG_START)) {
496 result = -EBUSY;
497 goto unlock;
498 }
499
500 if (start)
501 timeri->ticks = timeri->cticks = ticks;
502 else if (!timeri->cticks)
503 timeri->cticks = 1;
504 timeri->pticks = 0;
505
506 list_move_tail(&timeri->active_list, &timer->active_list_head);
507 if (timer->running) {
508 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
509 goto __start_now;
510 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
511 timeri->flags |= SNDRV_TIMER_IFLG_START;
512 result = 1; /* delayed start */
513 } else {
514 if (start)
515 timer->sticks = ticks;
516 timer->hw.start(timer);
517 __start_now:
518 timer->running++;
519 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
520 result = 0;
521 }
522 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
523 SNDRV_TIMER_EVENT_CONTINUE);
524 unlock:
525 spin_unlock_irqrestore(&timer->lock, flags);
526 return result;
527 }
528
529 /* start/continue a slave timer */
530 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
531 bool start)
532 {
533 unsigned long flags;
534
535 spin_lock_irqsave(&slave_active_lock, flags);
536 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
537 spin_unlock_irqrestore(&slave_active_lock, flags);
538 return -EBUSY;
539 }
540 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
541 if (timeri->master && timeri->timer) {
542 spin_lock(&timeri->timer->lock);
543 list_add_tail(&timeri->active_list,
544 &timeri->master->slave_active_head);
545 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
546 SNDRV_TIMER_EVENT_CONTINUE);
547 spin_unlock(&timeri->timer->lock);
548 }
549 spin_unlock_irqrestore(&slave_active_lock, flags);
550 return 1; /* delayed start */
551 }
552
553 /* stop/pause a master timer */
554 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
555 {
556 struct snd_timer *timer;
557 int result = 0;
558 unsigned long flags;
559
560 timer = timeri->timer;
561 if (!timer)
562 return -EINVAL;
563 spin_lock_irqsave(&timer->lock, flags);
564 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
565 SNDRV_TIMER_IFLG_START))) {
566 result = -EBUSY;
567 goto unlock;
568 }
569 list_del_init(&timeri->ack_list);
570 list_del_init(&timeri->active_list);
571 if (timer->card && timer->card->shutdown)
572 goto unlock;
573 if (stop) {
574 timeri->cticks = timeri->ticks;
575 timeri->pticks = 0;
576 }
577 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
578 !(--timer->running)) {
579 timer->hw.stop(timer);
580 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
581 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
582 snd_timer_reschedule(timer, 0);
583 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
584 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
585 timer->hw.start(timer);
586 }
587 }
588 }
589 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
590 if (stop)
591 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
592 else
593 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
594 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
595 SNDRV_TIMER_EVENT_CONTINUE);
596 unlock:
597 spin_unlock_irqrestore(&timer->lock, flags);
598 return result;
599 }
600
601 /* stop/pause a slave timer */
602 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
603 {
604 unsigned long flags;
605
606 spin_lock_irqsave(&slave_active_lock, flags);
607 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
608 spin_unlock_irqrestore(&slave_active_lock, flags);
609 return -EBUSY;
610 }
611 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
612 if (timeri->timer) {
613 spin_lock(&timeri->timer->lock);
614 list_del_init(&timeri->ack_list);
615 list_del_init(&timeri->active_list);
616 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
617 SNDRV_TIMER_EVENT_CONTINUE);
618 spin_unlock(&timeri->timer->lock);
619 }
620 spin_unlock_irqrestore(&slave_active_lock, flags);
621 return 0;
622 }
623
624 /*
625 * start the timer instance
626 */
627 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
628 {
629 if (timeri == NULL || ticks < 1)
630 return -EINVAL;
631 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
632 return snd_timer_start_slave(timeri, true);
633 else
634 return snd_timer_start1(timeri, true, ticks);
635 }
636 EXPORT_SYMBOL(snd_timer_start);
637
638 /*
639 * stop the timer instance.
640 *
641 * do not call this from the timer callback!
642 */
643 int snd_timer_stop(struct snd_timer_instance *timeri)
644 {
645 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
646 return snd_timer_stop_slave(timeri, true);
647 else
648 return snd_timer_stop1(timeri, true);
649 }
650 EXPORT_SYMBOL(snd_timer_stop);
651
652 /*
653 * start again.. the tick is kept.
654 */
655 int snd_timer_continue(struct snd_timer_instance *timeri)
656 {
657 /* timer can continue only after pause */
658 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
659 return -EINVAL;
660
661 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
662 return snd_timer_start_slave(timeri, false);
663 else
664 return snd_timer_start1(timeri, false, 0);
665 }
666 EXPORT_SYMBOL(snd_timer_continue);
667
668 /*
669 * pause.. remember the ticks left
670 */
671 int snd_timer_pause(struct snd_timer_instance * timeri)
672 {
673 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
674 return snd_timer_stop_slave(timeri, false);
675 else
676 return snd_timer_stop1(timeri, false);
677 }
678 EXPORT_SYMBOL(snd_timer_pause);
679
680 /*
681 * reschedule the timer
682 *
683 * start pending instances and check the scheduling ticks.
684 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
685 */
686 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
687 {
688 struct snd_timer_instance *ti;
689 unsigned long ticks = ~0UL;
690
691 list_for_each_entry(ti, &timer->active_list_head, active_list) {
692 if (ti->flags & SNDRV_TIMER_IFLG_START) {
693 ti->flags &= ~SNDRV_TIMER_IFLG_START;
694 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
695 timer->running++;
696 }
697 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
698 if (ticks > ti->cticks)
699 ticks = ti->cticks;
700 }
701 }
702 if (ticks == ~0UL) {
703 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
704 return;
705 }
706 if (ticks > timer->hw.ticks)
707 ticks = timer->hw.ticks;
708 if (ticks_left != ticks)
709 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
710 timer->sticks = ticks;
711 }
712
713 /*
714 * timer tasklet
715 *
716 */
717 static void snd_timer_tasklet(unsigned long arg)
718 {
719 struct snd_timer *timer = (struct snd_timer *) arg;
720 struct snd_timer_instance *ti;
721 struct list_head *p;
722 unsigned long resolution, ticks;
723 unsigned long flags;
724
725 if (timer->card && timer->card->shutdown)
726 return;
727
728 spin_lock_irqsave(&timer->lock, flags);
729 /* now process all callbacks */
730 while (!list_empty(&timer->sack_list_head)) {
731 p = timer->sack_list_head.next; /* get first item */
732 ti = list_entry(p, struct snd_timer_instance, ack_list);
733
734 /* remove from ack_list and make empty */
735 list_del_init(p);
736
737 ticks = ti->pticks;
738 ti->pticks = 0;
739 resolution = ti->resolution;
740
741 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
742 spin_unlock(&timer->lock);
743 if (ti->callback)
744 ti->callback(ti, resolution, ticks);
745 spin_lock(&timer->lock);
746 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
747 }
748 spin_unlock_irqrestore(&timer->lock, flags);
749 }
750
751 /*
752 * timer interrupt
753 *
754 * ticks_left is usually equal to timer->sticks.
755 *
756 */
757 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
758 {
759 struct snd_timer_instance *ti, *ts, *tmp;
760 unsigned long resolution, ticks;
761 struct list_head *p, *ack_list_head;
762 unsigned long flags;
763 int use_tasklet = 0;
764
765 if (timer == NULL)
766 return;
767
768 if (timer->card && timer->card->shutdown)
769 return;
770
771 spin_lock_irqsave(&timer->lock, flags);
772
773 /* remember the current resolution */
774 if (timer->hw.c_resolution)
775 resolution = timer->hw.c_resolution(timer);
776 else
777 resolution = timer->hw.resolution;
778
779 /* loop for all active instances
780 * Here we cannot use list_for_each_entry because the active_list of a
781 * processed instance is relinked to done_list_head before the callback
782 * is called.
783 */
784 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
785 active_list) {
786 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
787 continue;
788 ti->pticks += ticks_left;
789 ti->resolution = resolution;
790 if (ti->cticks < ticks_left)
791 ti->cticks = 0;
792 else
793 ti->cticks -= ticks_left;
794 if (ti->cticks) /* not expired */
795 continue;
796 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
797 ti->cticks = ti->ticks;
798 } else {
799 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
800 --timer->running;
801 list_del_init(&ti->active_list);
802 }
803 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
804 (ti->flags & SNDRV_TIMER_IFLG_FAST))
805 ack_list_head = &timer->ack_list_head;
806 else
807 ack_list_head = &timer->sack_list_head;
808 if (list_empty(&ti->ack_list))
809 list_add_tail(&ti->ack_list, ack_list_head);
810 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
811 ts->pticks = ti->pticks;
812 ts->resolution = resolution;
813 if (list_empty(&ts->ack_list))
814 list_add_tail(&ts->ack_list, ack_list_head);
815 }
816 }
817 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
818 snd_timer_reschedule(timer, timer->sticks);
819 if (timer->running) {
820 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
821 timer->hw.stop(timer);
822 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
823 }
824 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
825 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
826 /* restart timer */
827 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
828 timer->hw.start(timer);
829 }
830 } else {
831 timer->hw.stop(timer);
832 }
833
834 /* now process all fast callbacks */
835 while (!list_empty(&timer->ack_list_head)) {
836 p = timer->ack_list_head.next; /* get first item */
837 ti = list_entry(p, struct snd_timer_instance, ack_list);
838
839 /* remove from ack_list and make empty */
840 list_del_init(p);
841
842 ticks = ti->pticks;
843 ti->pticks = 0;
844
845 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
846 spin_unlock(&timer->lock);
847 if (ti->callback)
848 ti->callback(ti, resolution, ticks);
849 spin_lock(&timer->lock);
850 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
851 }
852
853 /* do we have any slow callbacks? */
854 use_tasklet = !list_empty(&timer->sack_list_head);
855 spin_unlock_irqrestore(&timer->lock, flags);
856
857 if (use_tasklet)
858 tasklet_schedule(&timer->task_queue);
859 }
860 EXPORT_SYMBOL(snd_timer_interrupt);
861
862 /*
863
864 */
865
866 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
867 struct snd_timer **rtimer)
868 {
869 struct snd_timer *timer;
870 int err;
871 static struct snd_device_ops ops = {
872 .dev_free = snd_timer_dev_free,
873 .dev_register = snd_timer_dev_register,
874 .dev_disconnect = snd_timer_dev_disconnect,
875 };
876
877 if (snd_BUG_ON(!tid))
878 return -EINVAL;
879 if (rtimer)
880 *rtimer = NULL;
881 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
882 if (!timer)
883 return -ENOMEM;
884 timer->tmr_class = tid->dev_class;
885 timer->card = card;
886 timer->tmr_device = tid->device;
887 timer->tmr_subdevice = tid->subdevice;
888 if (id)
889 strlcpy(timer->id, id, sizeof(timer->id));
890 timer->sticks = 1;
891 INIT_LIST_HEAD(&timer->device_list);
892 INIT_LIST_HEAD(&timer->open_list_head);
893 INIT_LIST_HEAD(&timer->active_list_head);
894 INIT_LIST_HEAD(&timer->ack_list_head);
895 INIT_LIST_HEAD(&timer->sack_list_head);
896 spin_lock_init(&timer->lock);
897 tasklet_init(&timer->task_queue, snd_timer_tasklet,
898 (unsigned long)timer);
899 timer->max_instances = 1000; /* default limit per timer */
900 if (card != NULL) {
901 timer->module = card->module;
902 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
903 if (err < 0) {
904 snd_timer_free(timer);
905 return err;
906 }
907 }
908 if (rtimer)
909 *rtimer = timer;
910 return 0;
911 }
912 EXPORT_SYMBOL(snd_timer_new);
913
914 static int snd_timer_free(struct snd_timer *timer)
915 {
916 if (!timer)
917 return 0;
918
919 mutex_lock(&register_mutex);
920 if (! list_empty(&timer->open_list_head)) {
921 struct list_head *p, *n;
922 struct snd_timer_instance *ti;
923 pr_warn("ALSA: timer %p is busy?\n", timer);
924 list_for_each_safe(p, n, &timer->open_list_head) {
925 list_del_init(p);
926 ti = list_entry(p, struct snd_timer_instance, open_list);
927 ti->timer = NULL;
928 }
929 }
930 list_del(&timer->device_list);
931 mutex_unlock(&register_mutex);
932
933 if (timer->private_free)
934 timer->private_free(timer);
935 kfree(timer);
936 return 0;
937 }
938
939 static int snd_timer_dev_free(struct snd_device *device)
940 {
941 struct snd_timer *timer = device->device_data;
942 return snd_timer_free(timer);
943 }
944
945 static int snd_timer_dev_register(struct snd_device *dev)
946 {
947 struct snd_timer *timer = dev->device_data;
948 struct snd_timer *timer1;
949
950 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
951 return -ENXIO;
952 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
953 !timer->hw.resolution && timer->hw.c_resolution == NULL)
954 return -EINVAL;
955
956 mutex_lock(&register_mutex);
957 list_for_each_entry(timer1, &snd_timer_list, device_list) {
958 if (timer1->tmr_class > timer->tmr_class)
959 break;
960 if (timer1->tmr_class < timer->tmr_class)
961 continue;
962 if (timer1->card && timer->card) {
963 if (timer1->card->number > timer->card->number)
964 break;
965 if (timer1->card->number < timer->card->number)
966 continue;
967 }
968 if (timer1->tmr_device > timer->tmr_device)
969 break;
970 if (timer1->tmr_device < timer->tmr_device)
971 continue;
972 if (timer1->tmr_subdevice > timer->tmr_subdevice)
973 break;
974 if (timer1->tmr_subdevice < timer->tmr_subdevice)
975 continue;
976 /* conflicts.. */
977 mutex_unlock(&register_mutex);
978 return -EBUSY;
979 }
980 list_add_tail(&timer->device_list, &timer1->device_list);
981 mutex_unlock(&register_mutex);
982 return 0;
983 }
984
985 static int snd_timer_dev_disconnect(struct snd_device *device)
986 {
987 struct snd_timer *timer = device->device_data;
988 struct snd_timer_instance *ti;
989
990 mutex_lock(&register_mutex);
991 list_del_init(&timer->device_list);
992 /* wake up pending sleepers */
993 list_for_each_entry(ti, &timer->open_list_head, open_list) {
994 if (ti->disconnect)
995 ti->disconnect(ti);
996 }
997 mutex_unlock(&register_mutex);
998 return 0;
999 }
1000
1001 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
1002 {
1003 unsigned long flags;
1004 unsigned long resolution = 0;
1005 struct snd_timer_instance *ti, *ts;
1006
1007 if (timer->card && timer->card->shutdown)
1008 return;
1009 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
1010 return;
1011 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
1012 event > SNDRV_TIMER_EVENT_MRESUME))
1013 return;
1014 spin_lock_irqsave(&timer->lock, flags);
1015 if (event == SNDRV_TIMER_EVENT_MSTART ||
1016 event == SNDRV_TIMER_EVENT_MCONTINUE ||
1017 event == SNDRV_TIMER_EVENT_MRESUME) {
1018 if (timer->hw.c_resolution)
1019 resolution = timer->hw.c_resolution(timer);
1020 else
1021 resolution = timer->hw.resolution;
1022 }
1023 list_for_each_entry(ti, &timer->active_list_head, active_list) {
1024 if (ti->ccallback)
1025 ti->ccallback(ti, event, tstamp, resolution);
1026 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1027 if (ts->ccallback)
1028 ts->ccallback(ts, event, tstamp, resolution);
1029 }
1030 spin_unlock_irqrestore(&timer->lock, flags);
1031 }
1032 EXPORT_SYMBOL(snd_timer_notify);
1033
1034 /*
1035 * exported functions for global timers
1036 */
1037 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1038 {
1039 struct snd_timer_id tid;
1040
1041 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1042 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1043 tid.card = -1;
1044 tid.device = device;
1045 tid.subdevice = 0;
1046 return snd_timer_new(NULL, id, &tid, rtimer);
1047 }
1048 EXPORT_SYMBOL(snd_timer_global_new);
1049
1050 int snd_timer_global_free(struct snd_timer *timer)
1051 {
1052 return snd_timer_free(timer);
1053 }
1054 EXPORT_SYMBOL(snd_timer_global_free);
1055
1056 int snd_timer_global_register(struct snd_timer *timer)
1057 {
1058 struct snd_device dev;
1059
1060 memset(&dev, 0, sizeof(dev));
1061 dev.device_data = timer;
1062 return snd_timer_dev_register(&dev);
1063 }
1064 EXPORT_SYMBOL(snd_timer_global_register);
1065
1066 /*
1067 * System timer
1068 */
1069
1070 struct snd_timer_system_private {
1071 struct timer_list tlist;
1072 struct snd_timer *snd_timer;
1073 unsigned long last_expires;
1074 unsigned long last_jiffies;
1075 unsigned long correction;
1076 };
1077
1078 static void snd_timer_s_function(struct timer_list *t)
1079 {
1080 struct snd_timer_system_private *priv = from_timer(priv, t,
1081 tlist);
1082 struct snd_timer *timer = priv->snd_timer;
1083 unsigned long jiff = jiffies;
1084 if (time_after(jiff, priv->last_expires))
1085 priv->correction += (long)jiff - (long)priv->last_expires;
1086 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1087 }
1088
1089 static int snd_timer_s_start(struct snd_timer * timer)
1090 {
1091 struct snd_timer_system_private *priv;
1092 unsigned long njiff;
1093
1094 priv = (struct snd_timer_system_private *) timer->private_data;
1095 njiff = (priv->last_jiffies = jiffies);
1096 if (priv->correction > timer->sticks - 1) {
1097 priv->correction -= timer->sticks - 1;
1098 njiff++;
1099 } else {
1100 njiff += timer->sticks - priv->correction;
1101 priv->correction = 0;
1102 }
1103 priv->last_expires = njiff;
1104 mod_timer(&priv->tlist, njiff);
1105 return 0;
1106 }
1107
1108 static int snd_timer_s_stop(struct snd_timer * timer)
1109 {
1110 struct snd_timer_system_private *priv;
1111 unsigned long jiff;
1112
1113 priv = (struct snd_timer_system_private *) timer->private_data;
1114 del_timer(&priv->tlist);
1115 jiff = jiffies;
1116 if (time_before(jiff, priv->last_expires))
1117 timer->sticks = priv->last_expires - jiff;
1118 else
1119 timer->sticks = 1;
1120 priv->correction = 0;
1121 return 0;
1122 }
1123
1124 static int snd_timer_s_close(struct snd_timer *timer)
1125 {
1126 struct snd_timer_system_private *priv;
1127
1128 priv = (struct snd_timer_system_private *)timer->private_data;
1129 del_timer_sync(&priv->tlist);
1130 return 0;
1131 }
1132
1133 static struct snd_timer_hardware snd_timer_system =
1134 {
1135 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1136 .resolution = 1000000000L / HZ,
1137 .ticks = 10000000L,
1138 .close = snd_timer_s_close,
1139 .start = snd_timer_s_start,
1140 .stop = snd_timer_s_stop
1141 };
1142
1143 static void snd_timer_free_system(struct snd_timer *timer)
1144 {
1145 kfree(timer->private_data);
1146 }
1147
1148 static int snd_timer_register_system(void)
1149 {
1150 struct snd_timer *timer;
1151 struct snd_timer_system_private *priv;
1152 int err;
1153
1154 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1155 if (err < 0)
1156 return err;
1157 strcpy(timer->name, "system timer");
1158 timer->hw = snd_timer_system;
1159 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1160 if (priv == NULL) {
1161 snd_timer_free(timer);
1162 return -ENOMEM;
1163 }
1164 priv->snd_timer = timer;
1165 timer_setup(&priv->tlist, snd_timer_s_function, 0);
1166 timer->private_data = priv;
1167 timer->private_free = snd_timer_free_system;
1168 return snd_timer_global_register(timer);
1169 }
1170
1171 #ifdef CONFIG_SND_PROC_FS
1172 /*
1173 * Info interface
1174 */
1175
1176 static void snd_timer_proc_read(struct snd_info_entry *entry,
1177 struct snd_info_buffer *buffer)
1178 {
1179 struct snd_timer *timer;
1180 struct snd_timer_instance *ti;
1181
1182 mutex_lock(&register_mutex);
1183 list_for_each_entry(timer, &snd_timer_list, device_list) {
1184 if (timer->card && timer->card->shutdown)
1185 continue;
1186 switch (timer->tmr_class) {
1187 case SNDRV_TIMER_CLASS_GLOBAL:
1188 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1189 break;
1190 case SNDRV_TIMER_CLASS_CARD:
1191 snd_iprintf(buffer, "C%i-%i: ",
1192 timer->card->number, timer->tmr_device);
1193 break;
1194 case SNDRV_TIMER_CLASS_PCM:
1195 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1196 timer->tmr_device, timer->tmr_subdevice);
1197 break;
1198 default:
1199 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1200 timer->card ? timer->card->number : -1,
1201 timer->tmr_device, timer->tmr_subdevice);
1202 }
1203 snd_iprintf(buffer, "%s :", timer->name);
1204 if (timer->hw.resolution)
1205 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1206 timer->hw.resolution / 1000,
1207 timer->hw.resolution % 1000,
1208 timer->hw.ticks);
1209 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1210 snd_iprintf(buffer, " SLAVE");
1211 snd_iprintf(buffer, "\n");
1212 list_for_each_entry(ti, &timer->open_list_head, open_list)
1213 snd_iprintf(buffer, " Client %s : %s\n",
1214 ti->owner ? ti->owner : "unknown",
1215 ti->flags & (SNDRV_TIMER_IFLG_START |
1216 SNDRV_TIMER_IFLG_RUNNING)
1217 ? "running" : "stopped");
1218 }
1219 mutex_unlock(&register_mutex);
1220 }
1221
1222 static struct snd_info_entry *snd_timer_proc_entry;
1223
1224 static void __init snd_timer_proc_init(void)
1225 {
1226 struct snd_info_entry *entry;
1227
1228 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1229 if (entry != NULL) {
1230 entry->c.text.read = snd_timer_proc_read;
1231 if (snd_info_register(entry) < 0) {
1232 snd_info_free_entry(entry);
1233 entry = NULL;
1234 }
1235 }
1236 snd_timer_proc_entry = entry;
1237 }
1238
1239 static void __exit snd_timer_proc_done(void)
1240 {
1241 snd_info_free_entry(snd_timer_proc_entry);
1242 }
1243 #else /* !CONFIG_SND_PROC_FS */
1244 #define snd_timer_proc_init()
1245 #define snd_timer_proc_done()
1246 #endif
1247
1248 /*
1249 * USER SPACE interface
1250 */
1251
1252 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1253 unsigned long resolution,
1254 unsigned long ticks)
1255 {
1256 struct snd_timer_user *tu = timeri->callback_data;
1257 struct snd_timer_read *r;
1258 int prev;
1259
1260 spin_lock(&tu->qlock);
1261 if (tu->qused > 0) {
1262 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1263 r = &tu->queue[prev];
1264 if (r->resolution == resolution) {
1265 r->ticks += ticks;
1266 goto __wake;
1267 }
1268 }
1269 if (tu->qused >= tu->queue_size) {
1270 tu->overrun++;
1271 } else {
1272 r = &tu->queue[tu->qtail++];
1273 tu->qtail %= tu->queue_size;
1274 r->resolution = resolution;
1275 r->ticks = ticks;
1276 tu->qused++;
1277 }
1278 __wake:
1279 spin_unlock(&tu->qlock);
1280 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1281 wake_up(&tu->qchange_sleep);
1282 }
1283
1284 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1285 struct snd_timer_tread *tread)
1286 {
1287 if (tu->qused >= tu->queue_size) {
1288 tu->overrun++;
1289 } else {
1290 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1291 tu->qtail %= tu->queue_size;
1292 tu->qused++;
1293 }
1294 }
1295
1296 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1297 int event,
1298 struct timespec *tstamp,
1299 unsigned long resolution)
1300 {
1301 struct snd_timer_user *tu = timeri->callback_data;
1302 struct snd_timer_tread r1;
1303 unsigned long flags;
1304
1305 if (event >= SNDRV_TIMER_EVENT_START &&
1306 event <= SNDRV_TIMER_EVENT_PAUSE)
1307 tu->tstamp = *tstamp;
1308 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1309 return;
1310 memset(&r1, 0, sizeof(r1));
1311 r1.event = event;
1312 r1.tstamp = *tstamp;
1313 r1.val = resolution;
1314 spin_lock_irqsave(&tu->qlock, flags);
1315 snd_timer_user_append_to_tqueue(tu, &r1);
1316 spin_unlock_irqrestore(&tu->qlock, flags);
1317 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1318 wake_up(&tu->qchange_sleep);
1319 }
1320
1321 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1322 {
1323 struct snd_timer_user *tu = timeri->callback_data;
1324
1325 tu->disconnected = true;
1326 wake_up(&tu->qchange_sleep);
1327 }
1328
1329 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1330 unsigned long resolution,
1331 unsigned long ticks)
1332 {
1333 struct snd_timer_user *tu = timeri->callback_data;
1334 struct snd_timer_tread *r, r1;
1335 struct timespec tstamp;
1336 int prev, append = 0;
1337
1338 memset(&r1, 0, sizeof(r1));
1339 memset(&tstamp, 0, sizeof(tstamp));
1340 spin_lock(&tu->qlock);
1341 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1342 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1343 spin_unlock(&tu->qlock);
1344 return;
1345 }
1346 if (tu->last_resolution != resolution || ticks > 0) {
1347 if (timer_tstamp_monotonic)
1348 ktime_get_ts(&tstamp);
1349 else
1350 getnstimeofday(&tstamp);
1351 }
1352 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1353 tu->last_resolution != resolution) {
1354 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1355 r1.tstamp = tstamp;
1356 r1.val = resolution;
1357 snd_timer_user_append_to_tqueue(tu, &r1);
1358 tu->last_resolution = resolution;
1359 append++;
1360 }
1361 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1362 goto __wake;
1363 if (ticks == 0)
1364 goto __wake;
1365 if (tu->qused > 0) {
1366 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1367 r = &tu->tqueue[prev];
1368 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1369 r->tstamp = tstamp;
1370 r->val += ticks;
1371 append++;
1372 goto __wake;
1373 }
1374 }
1375 r1.event = SNDRV_TIMER_EVENT_TICK;
1376 r1.tstamp = tstamp;
1377 r1.val = ticks;
1378 snd_timer_user_append_to_tqueue(tu, &r1);
1379 append++;
1380 __wake:
1381 spin_unlock(&tu->qlock);
1382 if (append == 0)
1383 return;
1384 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1385 wake_up(&tu->qchange_sleep);
1386 }
1387
1388 static int realloc_user_queue(struct snd_timer_user *tu, int size)
1389 {
1390 struct snd_timer_read *queue = NULL;
1391 struct snd_timer_tread *tqueue = NULL;
1392
1393 if (tu->tread) {
1394 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1395 if (!tqueue)
1396 return -ENOMEM;
1397 } else {
1398 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1399 if (!queue)
1400 return -ENOMEM;
1401 }
1402
1403 spin_lock_irq(&tu->qlock);
1404 kfree(tu->queue);
1405 kfree(tu->tqueue);
1406 tu->queue_size = size;
1407 tu->queue = queue;
1408 tu->tqueue = tqueue;
1409 tu->qhead = tu->qtail = tu->qused = 0;
1410 spin_unlock_irq(&tu->qlock);
1411
1412 return 0;
1413 }
1414
1415 static int snd_timer_user_open(struct inode *inode, struct file *file)
1416 {
1417 struct snd_timer_user *tu;
1418 int err;
1419
1420 err = nonseekable_open(inode, file);
1421 if (err < 0)
1422 return err;
1423
1424 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1425 if (tu == NULL)
1426 return -ENOMEM;
1427 spin_lock_init(&tu->qlock);
1428 init_waitqueue_head(&tu->qchange_sleep);
1429 mutex_init(&tu->ioctl_lock);
1430 tu->ticks = 1;
1431 if (realloc_user_queue(tu, 128) < 0) {
1432 kfree(tu);
1433 return -ENOMEM;
1434 }
1435 file->private_data = tu;
1436 return 0;
1437 }
1438
1439 static int snd_timer_user_release(struct inode *inode, struct file *file)
1440 {
1441 struct snd_timer_user *tu;
1442
1443 if (file->private_data) {
1444 tu = file->private_data;
1445 file->private_data = NULL;
1446 mutex_lock(&tu->ioctl_lock);
1447 if (tu->timeri)
1448 snd_timer_close(tu->timeri);
1449 mutex_unlock(&tu->ioctl_lock);
1450 kfree(tu->queue);
1451 kfree(tu->tqueue);
1452 kfree(tu);
1453 }
1454 return 0;
1455 }
1456
1457 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1458 {
1459 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1460 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1461 id->card = -1;
1462 id->device = -1;
1463 id->subdevice = -1;
1464 }
1465
1466 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1467 {
1468 id->dev_class = timer->tmr_class;
1469 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1470 id->card = timer->card ? timer->card->number : -1;
1471 id->device = timer->tmr_device;
1472 id->subdevice = timer->tmr_subdevice;
1473 }
1474
1475 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1476 {
1477 struct snd_timer_id id;
1478 struct snd_timer *timer;
1479 struct list_head *p;
1480
1481 if (copy_from_user(&id, _tid, sizeof(id)))
1482 return -EFAULT;
1483 mutex_lock(&register_mutex);
1484 if (id.dev_class < 0) { /* first item */
1485 if (list_empty(&snd_timer_list))
1486 snd_timer_user_zero_id(&id);
1487 else {
1488 timer = list_entry(snd_timer_list.next,
1489 struct snd_timer, device_list);
1490 snd_timer_user_copy_id(&id, timer);
1491 }
1492 } else {
1493 switch (id.dev_class) {
1494 case SNDRV_TIMER_CLASS_GLOBAL:
1495 id.device = id.device < 0 ? 0 : id.device + 1;
1496 list_for_each(p, &snd_timer_list) {
1497 timer = list_entry(p, struct snd_timer, device_list);
1498 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1499 snd_timer_user_copy_id(&id, timer);
1500 break;
1501 }
1502 if (timer->tmr_device >= id.device) {
1503 snd_timer_user_copy_id(&id, timer);
1504 break;
1505 }
1506 }
1507 if (p == &snd_timer_list)
1508 snd_timer_user_zero_id(&id);
1509 break;
1510 case SNDRV_TIMER_CLASS_CARD:
1511 case SNDRV_TIMER_CLASS_PCM:
1512 if (id.card < 0) {
1513 id.card = 0;
1514 } else {
1515 if (id.device < 0) {
1516 id.device = 0;
1517 } else {
1518 if (id.subdevice < 0)
1519 id.subdevice = 0;
1520 else
1521 id.subdevice++;
1522 }
1523 }
1524 list_for_each(p, &snd_timer_list) {
1525 timer = list_entry(p, struct snd_timer, device_list);
1526 if (timer->tmr_class > id.dev_class) {
1527 snd_timer_user_copy_id(&id, timer);
1528 break;
1529 }
1530 if (timer->tmr_class < id.dev_class)
1531 continue;
1532 if (timer->card->number > id.card) {
1533 snd_timer_user_copy_id(&id, timer);
1534 break;
1535 }
1536 if (timer->card->number < id.card)
1537 continue;
1538 if (timer->tmr_device > id.device) {
1539 snd_timer_user_copy_id(&id, timer);
1540 break;
1541 }
1542 if (timer->tmr_device < id.device)
1543 continue;
1544 if (timer->tmr_subdevice > id.subdevice) {
1545 snd_timer_user_copy_id(&id, timer);
1546 break;
1547 }
1548 if (timer->tmr_subdevice < id.subdevice)
1549 continue;
1550 snd_timer_user_copy_id(&id, timer);
1551 break;
1552 }
1553 if (p == &snd_timer_list)
1554 snd_timer_user_zero_id(&id);
1555 break;
1556 default:
1557 snd_timer_user_zero_id(&id);
1558 }
1559 }
1560 mutex_unlock(&register_mutex);
1561 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1562 return -EFAULT;
1563 return 0;
1564 }
1565
1566 static int snd_timer_user_ginfo(struct file *file,
1567 struct snd_timer_ginfo __user *_ginfo)
1568 {
1569 struct snd_timer_ginfo *ginfo;
1570 struct snd_timer_id tid;
1571 struct snd_timer *t;
1572 struct list_head *p;
1573 int err = 0;
1574
1575 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1576 if (IS_ERR(ginfo))
1577 return PTR_ERR(ginfo);
1578
1579 tid = ginfo->tid;
1580 memset(ginfo, 0, sizeof(*ginfo));
1581 ginfo->tid = tid;
1582 mutex_lock(&register_mutex);
1583 t = snd_timer_find(&tid);
1584 if (t != NULL) {
1585 ginfo->card = t->card ? t->card->number : -1;
1586 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1587 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1588 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1589 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1590 ginfo->resolution = t->hw.resolution;
1591 if (t->hw.resolution_min > 0) {
1592 ginfo->resolution_min = t->hw.resolution_min;
1593 ginfo->resolution_max = t->hw.resolution_max;
1594 }
1595 list_for_each(p, &t->open_list_head) {
1596 ginfo->clients++;
1597 }
1598 } else {
1599 err = -ENODEV;
1600 }
1601 mutex_unlock(&register_mutex);
1602 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1603 err = -EFAULT;
1604 kfree(ginfo);
1605 return err;
1606 }
1607
1608 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1609 {
1610 struct snd_timer *t;
1611 int err;
1612
1613 mutex_lock(&register_mutex);
1614 t = snd_timer_find(&gparams->tid);
1615 if (!t) {
1616 err = -ENODEV;
1617 goto _error;
1618 }
1619 if (!list_empty(&t->open_list_head)) {
1620 err = -EBUSY;
1621 goto _error;
1622 }
1623 if (!t->hw.set_period) {
1624 err = -ENOSYS;
1625 goto _error;
1626 }
1627 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1628 _error:
1629 mutex_unlock(&register_mutex);
1630 return err;
1631 }
1632
1633 static int snd_timer_user_gparams(struct file *file,
1634 struct snd_timer_gparams __user *_gparams)
1635 {
1636 struct snd_timer_gparams gparams;
1637
1638 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1639 return -EFAULT;
1640 return timer_set_gparams(&gparams);
1641 }
1642
1643 static int snd_timer_user_gstatus(struct file *file,
1644 struct snd_timer_gstatus __user *_gstatus)
1645 {
1646 struct snd_timer_gstatus gstatus;
1647 struct snd_timer_id tid;
1648 struct snd_timer *t;
1649 int err = 0;
1650
1651 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1652 return -EFAULT;
1653 tid = gstatus.tid;
1654 memset(&gstatus, 0, sizeof(gstatus));
1655 gstatus.tid = tid;
1656 mutex_lock(&register_mutex);
1657 t = snd_timer_find(&tid);
1658 if (t != NULL) {
1659 if (t->hw.c_resolution)
1660 gstatus.resolution = t->hw.c_resolution(t);
1661 else
1662 gstatus.resolution = t->hw.resolution;
1663 if (t->hw.precise_resolution) {
1664 t->hw.precise_resolution(t, &gstatus.resolution_num,
1665 &gstatus.resolution_den);
1666 } else {
1667 gstatus.resolution_num = gstatus.resolution;
1668 gstatus.resolution_den = 1000000000uL;
1669 }
1670 } else {
1671 err = -ENODEV;
1672 }
1673 mutex_unlock(&register_mutex);
1674 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1675 err = -EFAULT;
1676 return err;
1677 }
1678
1679 static int snd_timer_user_tselect(struct file *file,
1680 struct snd_timer_select __user *_tselect)
1681 {
1682 struct snd_timer_user *tu;
1683 struct snd_timer_select tselect;
1684 char str[32];
1685 int err = 0;
1686
1687 tu = file->private_data;
1688 if (tu->timeri) {
1689 snd_timer_close(tu->timeri);
1690 tu->timeri = NULL;
1691 }
1692 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1693 err = -EFAULT;
1694 goto __err;
1695 }
1696 sprintf(str, "application %i", current->pid);
1697 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1698 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1699 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1700 if (err < 0)
1701 goto __err;
1702
1703 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1704 tu->timeri->callback = tu->tread
1705 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1706 tu->timeri->ccallback = snd_timer_user_ccallback;
1707 tu->timeri->callback_data = (void *)tu;
1708 tu->timeri->disconnect = snd_timer_user_disconnect;
1709
1710 __err:
1711 return err;
1712 }
1713
1714 static int snd_timer_user_info(struct file *file,
1715 struct snd_timer_info __user *_info)
1716 {
1717 struct snd_timer_user *tu;
1718 struct snd_timer_info *info;
1719 struct snd_timer *t;
1720 int err = 0;
1721
1722 tu = file->private_data;
1723 if (!tu->timeri)
1724 return -EBADFD;
1725 t = tu->timeri->timer;
1726 if (!t)
1727 return -EBADFD;
1728
1729 info = kzalloc(sizeof(*info), GFP_KERNEL);
1730 if (! info)
1731 return -ENOMEM;
1732 info->card = t->card ? t->card->number : -1;
1733 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1734 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1735 strlcpy(info->id, t->id, sizeof(info->id));
1736 strlcpy(info->name, t->name, sizeof(info->name));
1737 info->resolution = t->hw.resolution;
1738 if (copy_to_user(_info, info, sizeof(*_info)))
1739 err = -EFAULT;
1740 kfree(info);
1741 return err;
1742 }
1743
1744 static int snd_timer_user_params(struct file *file,
1745 struct snd_timer_params __user *_params)
1746 {
1747 struct snd_timer_user *tu;
1748 struct snd_timer_params params;
1749 struct snd_timer *t;
1750 int err;
1751
1752 tu = file->private_data;
1753 if (!tu->timeri)
1754 return -EBADFD;
1755 t = tu->timeri->timer;
1756 if (!t)
1757 return -EBADFD;
1758 if (copy_from_user(&params, _params, sizeof(params)))
1759 return -EFAULT;
1760 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1761 u64 resolution;
1762
1763 if (params.ticks < 1) {
1764 err = -EINVAL;
1765 goto _end;
1766 }
1767
1768 /* Don't allow resolution less than 1ms */
1769 resolution = snd_timer_resolution(tu->timeri);
1770 resolution *= params.ticks;
1771 if (resolution < 1000000) {
1772 err = -EINVAL;
1773 goto _end;
1774 }
1775 }
1776 if (params.queue_size > 0 &&
1777 (params.queue_size < 32 || params.queue_size > 1024)) {
1778 err = -EINVAL;
1779 goto _end;
1780 }
1781 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1782 (1<<SNDRV_TIMER_EVENT_TICK)|
1783 (1<<SNDRV_TIMER_EVENT_START)|
1784 (1<<SNDRV_TIMER_EVENT_STOP)|
1785 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1786 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1787 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1788 (1<<SNDRV_TIMER_EVENT_RESUME)|
1789 (1<<SNDRV_TIMER_EVENT_MSTART)|
1790 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1791 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1792 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1793 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1794 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1795 err = -EINVAL;
1796 goto _end;
1797 }
1798 snd_timer_stop(tu->timeri);
1799 spin_lock_irq(&t->lock);
1800 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1801 SNDRV_TIMER_IFLG_EXCLUSIVE|
1802 SNDRV_TIMER_IFLG_EARLY_EVENT);
1803 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1804 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1805 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1806 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1807 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1808 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1809 spin_unlock_irq(&t->lock);
1810 if (params.queue_size > 0 &&
1811 (unsigned int)tu->queue_size != params.queue_size) {
1812 err = realloc_user_queue(tu, params.queue_size);
1813 if (err < 0)
1814 goto _end;
1815 }
1816 spin_lock_irq(&tu->qlock);
1817 tu->qhead = tu->qtail = tu->qused = 0;
1818 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1819 if (tu->tread) {
1820 struct snd_timer_tread tread;
1821 memset(&tread, 0, sizeof(tread));
1822 tread.event = SNDRV_TIMER_EVENT_EARLY;
1823 tread.tstamp.tv_sec = 0;
1824 tread.tstamp.tv_nsec = 0;
1825 tread.val = 0;
1826 snd_timer_user_append_to_tqueue(tu, &tread);
1827 } else {
1828 struct snd_timer_read *r = &tu->queue[0];
1829 r->resolution = 0;
1830 r->ticks = 0;
1831 tu->qused++;
1832 tu->qtail++;
1833 }
1834 }
1835 tu->filter = params.filter;
1836 tu->ticks = params.ticks;
1837 spin_unlock_irq(&tu->qlock);
1838 err = 0;
1839 _end:
1840 if (copy_to_user(_params, &params, sizeof(params)))
1841 return -EFAULT;
1842 return err;
1843 }
1844
1845 static int snd_timer_user_status(struct file *file,
1846 struct snd_timer_status __user *_status)
1847 {
1848 struct snd_timer_user *tu;
1849 struct snd_timer_status status;
1850
1851 tu = file->private_data;
1852 if (!tu->timeri)
1853 return -EBADFD;
1854 memset(&status, 0, sizeof(status));
1855 status.tstamp = tu->tstamp;
1856 status.resolution = snd_timer_resolution(tu->timeri);
1857 status.lost = tu->timeri->lost;
1858 status.overrun = tu->overrun;
1859 spin_lock_irq(&tu->qlock);
1860 status.queue = tu->qused;
1861 spin_unlock_irq(&tu->qlock);
1862 if (copy_to_user(_status, &status, sizeof(status)))
1863 return -EFAULT;
1864 return 0;
1865 }
1866
1867 static int snd_timer_user_start(struct file *file)
1868 {
1869 int err;
1870 struct snd_timer_user *tu;
1871
1872 tu = file->private_data;
1873 if (!tu->timeri)
1874 return -EBADFD;
1875 snd_timer_stop(tu->timeri);
1876 tu->timeri->lost = 0;
1877 tu->last_resolution = 0;
1878 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1879 }
1880
1881 static int snd_timer_user_stop(struct file *file)
1882 {
1883 int err;
1884 struct snd_timer_user *tu;
1885
1886 tu = file->private_data;
1887 if (!tu->timeri)
1888 return -EBADFD;
1889 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1890 }
1891
1892 static int snd_timer_user_continue(struct file *file)
1893 {
1894 int err;
1895 struct snd_timer_user *tu;
1896
1897 tu = file->private_data;
1898 if (!tu->timeri)
1899 return -EBADFD;
1900 /* start timer instead of continue if it's not used before */
1901 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1902 return snd_timer_user_start(file);
1903 tu->timeri->lost = 0;
1904 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1905 }
1906
1907 static int snd_timer_user_pause(struct file *file)
1908 {
1909 int err;
1910 struct snd_timer_user *tu;
1911
1912 tu = file->private_data;
1913 if (!tu->timeri)
1914 return -EBADFD;
1915 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1916 }
1917
1918 enum {
1919 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1920 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1921 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1922 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1923 };
1924
1925 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1926 unsigned long arg)
1927 {
1928 struct snd_timer_user *tu;
1929 void __user *argp = (void __user *)arg;
1930 int __user *p = argp;
1931
1932 tu = file->private_data;
1933 switch (cmd) {
1934 case SNDRV_TIMER_IOCTL_PVERSION:
1935 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1936 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1937 return snd_timer_user_next_device(argp);
1938 case SNDRV_TIMER_IOCTL_TREAD:
1939 {
1940 int xarg, old_tread;
1941
1942 if (tu->timeri) /* too late */
1943 return -EBUSY;
1944 if (get_user(xarg, p))
1945 return -EFAULT;
1946 old_tread = tu->tread;
1947 tu->tread = xarg ? 1 : 0;
1948 if (tu->tread != old_tread &&
1949 realloc_user_queue(tu, tu->queue_size) < 0) {
1950 tu->tread = old_tread;
1951 return -ENOMEM;
1952 }
1953 return 0;
1954 }
1955 case SNDRV_TIMER_IOCTL_GINFO:
1956 return snd_timer_user_ginfo(file, argp);
1957 case SNDRV_TIMER_IOCTL_GPARAMS:
1958 return snd_timer_user_gparams(file, argp);
1959 case SNDRV_TIMER_IOCTL_GSTATUS:
1960 return snd_timer_user_gstatus(file, argp);
1961 case SNDRV_TIMER_IOCTL_SELECT:
1962 return snd_timer_user_tselect(file, argp);
1963 case SNDRV_TIMER_IOCTL_INFO:
1964 return snd_timer_user_info(file, argp);
1965 case SNDRV_TIMER_IOCTL_PARAMS:
1966 return snd_timer_user_params(file, argp);
1967 case SNDRV_TIMER_IOCTL_STATUS:
1968 return snd_timer_user_status(file, argp);
1969 case SNDRV_TIMER_IOCTL_START:
1970 case SNDRV_TIMER_IOCTL_START_OLD:
1971 return snd_timer_user_start(file);
1972 case SNDRV_TIMER_IOCTL_STOP:
1973 case SNDRV_TIMER_IOCTL_STOP_OLD:
1974 return snd_timer_user_stop(file);
1975 case SNDRV_TIMER_IOCTL_CONTINUE:
1976 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1977 return snd_timer_user_continue(file);
1978 case SNDRV_TIMER_IOCTL_PAUSE:
1979 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1980 return snd_timer_user_pause(file);
1981 }
1982 return -ENOTTY;
1983 }
1984
1985 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1986 unsigned long arg)
1987 {
1988 struct snd_timer_user *tu = file->private_data;
1989 long ret;
1990
1991 mutex_lock(&tu->ioctl_lock);
1992 ret = __snd_timer_user_ioctl(file, cmd, arg);
1993 mutex_unlock(&tu->ioctl_lock);
1994 return ret;
1995 }
1996
1997 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1998 {
1999 struct snd_timer_user *tu;
2000
2001 tu = file->private_data;
2002 return fasync_helper(fd, file, on, &tu->fasync);
2003 }
2004
2005 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
2006 size_t count, loff_t *offset)
2007 {
2008 struct snd_timer_user *tu;
2009 long result = 0, unit;
2010 int qhead;
2011 int err = 0;
2012
2013 tu = file->private_data;
2014 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
2015 mutex_lock(&tu->ioctl_lock);
2016 spin_lock_irq(&tu->qlock);
2017 while ((long)count - result >= unit) {
2018 while (!tu->qused) {
2019 wait_queue_entry_t wait;
2020
2021 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
2022 err = -EAGAIN;
2023 goto _error;
2024 }
2025
2026 set_current_state(TASK_INTERRUPTIBLE);
2027 init_waitqueue_entry(&wait, current);
2028 add_wait_queue(&tu->qchange_sleep, &wait);
2029
2030 spin_unlock_irq(&tu->qlock);
2031 mutex_unlock(&tu->ioctl_lock);
2032 schedule();
2033 mutex_lock(&tu->ioctl_lock);
2034 spin_lock_irq(&tu->qlock);
2035
2036 remove_wait_queue(&tu->qchange_sleep, &wait);
2037
2038 if (tu->disconnected) {
2039 err = -ENODEV;
2040 goto _error;
2041 }
2042 if (signal_pending(current)) {
2043 err = -ERESTARTSYS;
2044 goto _error;
2045 }
2046 }
2047
2048 qhead = tu->qhead++;
2049 tu->qhead %= tu->queue_size;
2050 tu->qused--;
2051 spin_unlock_irq(&tu->qlock);
2052
2053 if (tu->tread) {
2054 if (copy_to_user(buffer, &tu->tqueue[qhead],
2055 sizeof(struct snd_timer_tread)))
2056 err = -EFAULT;
2057 } else {
2058 if (copy_to_user(buffer, &tu->queue[qhead],
2059 sizeof(struct snd_timer_read)))
2060 err = -EFAULT;
2061 }
2062
2063 spin_lock_irq(&tu->qlock);
2064 if (err < 0)
2065 goto _error;
2066 result += unit;
2067 buffer += unit;
2068 }
2069 _error:
2070 spin_unlock_irq(&tu->qlock);
2071 mutex_unlock(&tu->ioctl_lock);
2072 return result > 0 ? result : err;
2073 }
2074
2075 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
2076 {
2077 unsigned int mask;
2078 struct snd_timer_user *tu;
2079
2080 tu = file->private_data;
2081
2082 poll_wait(file, &tu->qchange_sleep, wait);
2083
2084 mask = 0;
2085 spin_lock_irq(&tu->qlock);
2086 if (tu->qused)
2087 mask |= POLLIN | POLLRDNORM;
2088 if (tu->disconnected)
2089 mask |= POLLERR;
2090 spin_unlock_irq(&tu->qlock);
2091
2092 return mask;
2093 }
2094
2095 #ifdef CONFIG_COMPAT
2096 #include "timer_compat.c"
2097 #else
2098 #define snd_timer_user_ioctl_compat NULL
2099 #endif
2100
2101 static const struct file_operations snd_timer_f_ops =
2102 {
2103 .owner = THIS_MODULE,
2104 .read = snd_timer_user_read,
2105 .open = snd_timer_user_open,
2106 .release = snd_timer_user_release,
2107 .llseek = no_llseek,
2108 .poll = snd_timer_user_poll,
2109 .unlocked_ioctl = snd_timer_user_ioctl,
2110 .compat_ioctl = snd_timer_user_ioctl_compat,
2111 .fasync = snd_timer_user_fasync,
2112 };
2113
2114 /* unregister the system timer */
2115 static void snd_timer_free_all(void)
2116 {
2117 struct snd_timer *timer, *n;
2118
2119 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2120 snd_timer_free(timer);
2121 }
2122
2123 static struct device timer_dev;
2124
2125 /*
2126 * ENTRY functions
2127 */
2128
2129 static int __init alsa_timer_init(void)
2130 {
2131 int err;
2132
2133 snd_device_initialize(&timer_dev, NULL);
2134 dev_set_name(&timer_dev, "timer");
2135
2136 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2137 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2138 "system timer");
2139 #endif
2140
2141 err = snd_timer_register_system();
2142 if (err < 0) {
2143 pr_err("ALSA: unable to register system timer (%i)\n", err);
2144 goto put_timer;
2145 }
2146
2147 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2148 &snd_timer_f_ops, NULL, &timer_dev);
2149 if (err < 0) {
2150 pr_err("ALSA: unable to register timer device (%i)\n", err);
2151 snd_timer_free_all();
2152 goto put_timer;
2153 }
2154
2155 snd_timer_proc_init();
2156 return 0;
2157
2158 put_timer:
2159 put_device(&timer_dev);
2160 return err;
2161 }
2162
2163 static void __exit alsa_timer_exit(void)
2164 {
2165 snd_unregister_device(&timer_dev);
2166 snd_timer_free_all();
2167 put_device(&timer_dev);
2168 snd_timer_proc_done();
2169 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2170 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2171 #endif
2172 }
2173
2174 module_init(alsa_timer_init)
2175 module_exit(alsa_timer_exit)
Linux with added FPC-III support