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Merge remote-tracking branch 'regulator/fix/max77802' into regulator-linus
[mirror_ubuntu-artful-kernel.git] / sound / core / timer.c
1 /*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <linux/device.h>
28 #include <linux/module.h>
29 #include <linux/string.h>
30 #include <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 void 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 list_move_tail(&slave->open_list,
194 &master->slave_list_head);
195 spin_lock_irq(&slave_active_lock);
196 slave->master = master;
197 slave->timer = master->timer;
198 spin_unlock_irq(&slave_active_lock);
199 return;
200 }
201 }
202 }
203 }
204
205 /*
206 * look for slave instances matching with the slave id of the given master.
207 * when found, relink the open_link of slaves.
208 *
209 * call this with register_mutex down.
210 */
211 static void snd_timer_check_master(struct snd_timer_instance *master)
212 {
213 struct snd_timer_instance *slave, *tmp;
214
215 /* check all pending slaves */
216 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
217 if (slave->slave_class == master->slave_class &&
218 slave->slave_id == master->slave_id) {
219 list_move_tail(&slave->open_list, &master->slave_list_head);
220 spin_lock_irq(&slave_active_lock);
221 spin_lock(&master->timer->lock);
222 slave->master = master;
223 slave->timer = master->timer;
224 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
225 list_add_tail(&slave->active_list,
226 &master->slave_active_head);
227 spin_unlock(&master->timer->lock);
228 spin_unlock_irq(&slave_active_lock);
229 }
230 }
231 }
232
233 /*
234 * open a timer instance
235 * when opening a master, the slave id must be here given.
236 */
237 int snd_timer_open(struct snd_timer_instance **ti,
238 char *owner, struct snd_timer_id *tid,
239 unsigned int slave_id)
240 {
241 struct snd_timer *timer;
242 struct snd_timer_instance *timeri = NULL;
243
244 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
245 /* open a slave instance */
246 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
247 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
248 pr_debug("ALSA: timer: invalid slave class %i\n",
249 tid->dev_sclass);
250 return -EINVAL;
251 }
252 mutex_lock(&register_mutex);
253 timeri = snd_timer_instance_new(owner, NULL);
254 if (!timeri) {
255 mutex_unlock(&register_mutex);
256 return -ENOMEM;
257 }
258 timeri->slave_class = tid->dev_sclass;
259 timeri->slave_id = tid->device;
260 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
261 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
262 snd_timer_check_slave(timeri);
263 mutex_unlock(&register_mutex);
264 *ti = timeri;
265 return 0;
266 }
267
268 /* open a master instance */
269 mutex_lock(&register_mutex);
270 timer = snd_timer_find(tid);
271 #ifdef CONFIG_MODULES
272 if (!timer) {
273 mutex_unlock(&register_mutex);
274 snd_timer_request(tid);
275 mutex_lock(&register_mutex);
276 timer = snd_timer_find(tid);
277 }
278 #endif
279 if (!timer) {
280 mutex_unlock(&register_mutex);
281 return -ENODEV;
282 }
283 if (!list_empty(&timer->open_list_head)) {
284 timeri = list_entry(timer->open_list_head.next,
285 struct snd_timer_instance, open_list);
286 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
287 mutex_unlock(&register_mutex);
288 return -EBUSY;
289 }
290 }
291 timeri = snd_timer_instance_new(owner, timer);
292 if (!timeri) {
293 mutex_unlock(&register_mutex);
294 return -ENOMEM;
295 }
296 /* take a card refcount for safe disconnection */
297 if (timer->card)
298 get_device(&timer->card->card_dev);
299 timeri->slave_class = tid->dev_sclass;
300 timeri->slave_id = slave_id;
301
302 if (list_empty(&timer->open_list_head) && timer->hw.open) {
303 int err = timer->hw.open(timer);
304 if (err) {
305 kfree(timeri->owner);
306 kfree(timeri);
307
308 if (timer->card)
309 put_device(&timer->card->card_dev);
310 module_put(timer->module);
311 mutex_unlock(&register_mutex);
312 return err;
313 }
314 }
315
316 list_add_tail(&timeri->open_list, &timer->open_list_head);
317 snd_timer_check_master(timeri);
318 mutex_unlock(&register_mutex);
319 *ti = timeri;
320 return 0;
321 }
322
323 /*
324 * close a timer instance
325 */
326 int snd_timer_close(struct snd_timer_instance *timeri)
327 {
328 struct snd_timer *timer = NULL;
329 struct snd_timer_instance *slave, *tmp;
330
331 if (snd_BUG_ON(!timeri))
332 return -ENXIO;
333
334 mutex_lock(&register_mutex);
335 list_del(&timeri->open_list);
336
337 /* force to stop the timer */
338 snd_timer_stop(timeri);
339
340 timer = timeri->timer;
341 if (timer) {
342 /* wait, until the active callback is finished */
343 spin_lock_irq(&timer->lock);
344 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
345 spin_unlock_irq(&timer->lock);
346 udelay(10);
347 spin_lock_irq(&timer->lock);
348 }
349 spin_unlock_irq(&timer->lock);
350
351 /* remove slave links */
352 spin_lock_irq(&slave_active_lock);
353 spin_lock(&timer->lock);
354 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
355 open_list) {
356 list_move_tail(&slave->open_list, &snd_timer_slave_list);
357 slave->master = NULL;
358 slave->timer = NULL;
359 list_del_init(&slave->ack_list);
360 list_del_init(&slave->active_list);
361 }
362 spin_unlock(&timer->lock);
363 spin_unlock_irq(&slave_active_lock);
364
365 /* slave doesn't need to release timer resources below */
366 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
367 timer = NULL;
368 }
369
370 if (timeri->private_free)
371 timeri->private_free(timeri);
372 kfree(timeri->owner);
373 kfree(timeri);
374
375 if (timer) {
376 if (list_empty(&timer->open_list_head) && timer->hw.close)
377 timer->hw.close(timer);
378 /* release a card refcount for safe disconnection */
379 if (timer->card)
380 put_device(&timer->card->card_dev);
381 module_put(timer->module);
382 }
383
384 mutex_unlock(&register_mutex);
385 return 0;
386 }
387
388 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
389 {
390 struct snd_timer * timer;
391
392 if (timeri == NULL)
393 return 0;
394 if ((timer = timeri->timer) != NULL) {
395 if (timer->hw.c_resolution)
396 return timer->hw.c_resolution(timer);
397 return timer->hw.resolution;
398 }
399 return 0;
400 }
401
402 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
403 {
404 struct snd_timer *timer;
405 unsigned long resolution = 0;
406 struct snd_timer_instance *ts;
407 struct timespec tstamp;
408
409 if (timer_tstamp_monotonic)
410 ktime_get_ts(&tstamp);
411 else
412 getnstimeofday(&tstamp);
413 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
414 event > SNDRV_TIMER_EVENT_PAUSE))
415 return;
416 if (event == SNDRV_TIMER_EVENT_START ||
417 event == SNDRV_TIMER_EVENT_CONTINUE)
418 resolution = snd_timer_resolution(ti);
419 if (ti->ccallback)
420 ti->ccallback(ti, event, &tstamp, resolution);
421 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
422 return;
423 timer = ti->timer;
424 if (timer == NULL)
425 return;
426 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
427 return;
428 list_for_each_entry(ts, &ti->slave_active_head, active_list)
429 if (ts->ccallback)
430 ts->ccallback(ts, event + 100, &tstamp, resolution);
431 }
432
433 /* start/continue a master timer */
434 static int snd_timer_start1(struct snd_timer_instance *timeri,
435 bool start, unsigned long ticks)
436 {
437 struct snd_timer *timer;
438 int result;
439 unsigned long flags;
440
441 timer = timeri->timer;
442 if (!timer)
443 return -EINVAL;
444
445 spin_lock_irqsave(&timer->lock, flags);
446 if (timer->card && timer->card->shutdown) {
447 result = -ENODEV;
448 goto unlock;
449 }
450 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
451 SNDRV_TIMER_IFLG_START)) {
452 result = -EBUSY;
453 goto unlock;
454 }
455
456 if (start)
457 timeri->ticks = timeri->cticks = ticks;
458 else if (!timeri->cticks)
459 timeri->cticks = 1;
460 timeri->pticks = 0;
461
462 list_move_tail(&timeri->active_list, &timer->active_list_head);
463 if (timer->running) {
464 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
465 goto __start_now;
466 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
467 timeri->flags |= SNDRV_TIMER_IFLG_START;
468 result = 1; /* delayed start */
469 } else {
470 if (start)
471 timer->sticks = ticks;
472 timer->hw.start(timer);
473 __start_now:
474 timer->running++;
475 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
476 result = 0;
477 }
478 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
479 SNDRV_TIMER_EVENT_CONTINUE);
480 unlock:
481 spin_unlock_irqrestore(&timer->lock, flags);
482 return result;
483 }
484
485 /* start/continue a slave timer */
486 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
487 bool start)
488 {
489 unsigned long flags;
490
491 spin_lock_irqsave(&slave_active_lock, flags);
492 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
493 spin_unlock_irqrestore(&slave_active_lock, flags);
494 return -EBUSY;
495 }
496 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
497 if (timeri->master && timeri->timer) {
498 spin_lock(&timeri->timer->lock);
499 list_add_tail(&timeri->active_list,
500 &timeri->master->slave_active_head);
501 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
502 SNDRV_TIMER_EVENT_CONTINUE);
503 spin_unlock(&timeri->timer->lock);
504 }
505 spin_unlock_irqrestore(&slave_active_lock, flags);
506 return 1; /* delayed start */
507 }
508
509 /* stop/pause a master timer */
510 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
511 {
512 struct snd_timer *timer;
513 int result = 0;
514 unsigned long flags;
515
516 timer = timeri->timer;
517 if (!timer)
518 return -EINVAL;
519 spin_lock_irqsave(&timer->lock, flags);
520 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
521 SNDRV_TIMER_IFLG_START))) {
522 result = -EBUSY;
523 goto unlock;
524 }
525 list_del_init(&timeri->ack_list);
526 list_del_init(&timeri->active_list);
527 if (timer->card && timer->card->shutdown)
528 goto unlock;
529 if (stop) {
530 timeri->cticks = timeri->ticks;
531 timeri->pticks = 0;
532 }
533 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
534 !(--timer->running)) {
535 timer->hw.stop(timer);
536 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
537 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
538 snd_timer_reschedule(timer, 0);
539 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
540 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
541 timer->hw.start(timer);
542 }
543 }
544 }
545 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
546 if (stop)
547 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
548 else
549 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
550 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
551 SNDRV_TIMER_EVENT_CONTINUE);
552 unlock:
553 spin_unlock_irqrestore(&timer->lock, flags);
554 return result;
555 }
556
557 /* stop/pause a slave timer */
558 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
559 {
560 unsigned long flags;
561
562 spin_lock_irqsave(&slave_active_lock, flags);
563 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
564 spin_unlock_irqrestore(&slave_active_lock, flags);
565 return -EBUSY;
566 }
567 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
568 if (timeri->timer) {
569 spin_lock(&timeri->timer->lock);
570 list_del_init(&timeri->ack_list);
571 list_del_init(&timeri->active_list);
572 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
573 SNDRV_TIMER_EVENT_CONTINUE);
574 spin_unlock(&timeri->timer->lock);
575 }
576 spin_unlock_irqrestore(&slave_active_lock, flags);
577 return 0;
578 }
579
580 /*
581 * start the timer instance
582 */
583 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
584 {
585 if (timeri == NULL || ticks < 1)
586 return -EINVAL;
587 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
588 return snd_timer_start_slave(timeri, true);
589 else
590 return snd_timer_start1(timeri, true, ticks);
591 }
592
593 /*
594 * stop the timer instance.
595 *
596 * do not call this from the timer callback!
597 */
598 int snd_timer_stop(struct snd_timer_instance *timeri)
599 {
600 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
601 return snd_timer_stop_slave(timeri, true);
602 else
603 return snd_timer_stop1(timeri, true);
604 }
605
606 /*
607 * start again.. the tick is kept.
608 */
609 int snd_timer_continue(struct snd_timer_instance *timeri)
610 {
611 /* timer can continue only after pause */
612 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
613 return -EINVAL;
614
615 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
616 return snd_timer_start_slave(timeri, false);
617 else
618 return snd_timer_start1(timeri, false, 0);
619 }
620
621 /*
622 * pause.. remember the ticks left
623 */
624 int snd_timer_pause(struct snd_timer_instance * timeri)
625 {
626 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
627 return snd_timer_stop_slave(timeri, false);
628 else
629 return snd_timer_stop1(timeri, false);
630 }
631
632 /*
633 * reschedule the timer
634 *
635 * start pending instances and check the scheduling ticks.
636 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
637 */
638 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
639 {
640 struct snd_timer_instance *ti;
641 unsigned long ticks = ~0UL;
642
643 list_for_each_entry(ti, &timer->active_list_head, active_list) {
644 if (ti->flags & SNDRV_TIMER_IFLG_START) {
645 ti->flags &= ~SNDRV_TIMER_IFLG_START;
646 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
647 timer->running++;
648 }
649 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
650 if (ticks > ti->cticks)
651 ticks = ti->cticks;
652 }
653 }
654 if (ticks == ~0UL) {
655 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
656 return;
657 }
658 if (ticks > timer->hw.ticks)
659 ticks = timer->hw.ticks;
660 if (ticks_left != ticks)
661 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
662 timer->sticks = ticks;
663 }
664
665 /*
666 * timer tasklet
667 *
668 */
669 static void snd_timer_tasklet(unsigned long arg)
670 {
671 struct snd_timer *timer = (struct snd_timer *) arg;
672 struct snd_timer_instance *ti;
673 struct list_head *p;
674 unsigned long resolution, ticks;
675 unsigned long flags;
676
677 if (timer->card && timer->card->shutdown)
678 return;
679
680 spin_lock_irqsave(&timer->lock, flags);
681 /* now process all callbacks */
682 while (!list_empty(&timer->sack_list_head)) {
683 p = timer->sack_list_head.next; /* get first item */
684 ti = list_entry(p, struct snd_timer_instance, ack_list);
685
686 /* remove from ack_list and make empty */
687 list_del_init(p);
688
689 ticks = ti->pticks;
690 ti->pticks = 0;
691 resolution = ti->resolution;
692
693 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
694 spin_unlock(&timer->lock);
695 if (ti->callback)
696 ti->callback(ti, resolution, ticks);
697 spin_lock(&timer->lock);
698 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
699 }
700 spin_unlock_irqrestore(&timer->lock, flags);
701 }
702
703 /*
704 * timer interrupt
705 *
706 * ticks_left is usually equal to timer->sticks.
707 *
708 */
709 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
710 {
711 struct snd_timer_instance *ti, *ts, *tmp;
712 unsigned long resolution, ticks;
713 struct list_head *p, *ack_list_head;
714 unsigned long flags;
715 int use_tasklet = 0;
716
717 if (timer == NULL)
718 return;
719
720 if (timer->card && timer->card->shutdown)
721 return;
722
723 spin_lock_irqsave(&timer->lock, flags);
724
725 /* remember the current resolution */
726 if (timer->hw.c_resolution)
727 resolution = timer->hw.c_resolution(timer);
728 else
729 resolution = timer->hw.resolution;
730
731 /* loop for all active instances
732 * Here we cannot use list_for_each_entry because the active_list of a
733 * processed instance is relinked to done_list_head before the callback
734 * is called.
735 */
736 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
737 active_list) {
738 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
739 continue;
740 ti->pticks += ticks_left;
741 ti->resolution = resolution;
742 if (ti->cticks < ticks_left)
743 ti->cticks = 0;
744 else
745 ti->cticks -= ticks_left;
746 if (ti->cticks) /* not expired */
747 continue;
748 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
749 ti->cticks = ti->ticks;
750 } else {
751 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
752 --timer->running;
753 list_del_init(&ti->active_list);
754 }
755 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
756 (ti->flags & SNDRV_TIMER_IFLG_FAST))
757 ack_list_head = &timer->ack_list_head;
758 else
759 ack_list_head = &timer->sack_list_head;
760 if (list_empty(&ti->ack_list))
761 list_add_tail(&ti->ack_list, ack_list_head);
762 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
763 ts->pticks = ti->pticks;
764 ts->resolution = resolution;
765 if (list_empty(&ts->ack_list))
766 list_add_tail(&ts->ack_list, ack_list_head);
767 }
768 }
769 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
770 snd_timer_reschedule(timer, timer->sticks);
771 if (timer->running) {
772 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
773 timer->hw.stop(timer);
774 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
775 }
776 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
777 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
778 /* restart timer */
779 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
780 timer->hw.start(timer);
781 }
782 } else {
783 timer->hw.stop(timer);
784 }
785
786 /* now process all fast callbacks */
787 while (!list_empty(&timer->ack_list_head)) {
788 p = timer->ack_list_head.next; /* get first item */
789 ti = list_entry(p, struct snd_timer_instance, ack_list);
790
791 /* remove from ack_list and make empty */
792 list_del_init(p);
793
794 ticks = ti->pticks;
795 ti->pticks = 0;
796
797 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
798 spin_unlock(&timer->lock);
799 if (ti->callback)
800 ti->callback(ti, resolution, ticks);
801 spin_lock(&timer->lock);
802 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
803 }
804
805 /* do we have any slow callbacks? */
806 use_tasklet = !list_empty(&timer->sack_list_head);
807 spin_unlock_irqrestore(&timer->lock, flags);
808
809 if (use_tasklet)
810 tasklet_schedule(&timer->task_queue);
811 }
812
813 /*
814
815 */
816
817 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
818 struct snd_timer **rtimer)
819 {
820 struct snd_timer *timer;
821 int err;
822 static struct snd_device_ops ops = {
823 .dev_free = snd_timer_dev_free,
824 .dev_register = snd_timer_dev_register,
825 .dev_disconnect = snd_timer_dev_disconnect,
826 };
827
828 if (snd_BUG_ON(!tid))
829 return -EINVAL;
830 if (rtimer)
831 *rtimer = NULL;
832 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
833 if (!timer)
834 return -ENOMEM;
835 timer->tmr_class = tid->dev_class;
836 timer->card = card;
837 timer->tmr_device = tid->device;
838 timer->tmr_subdevice = tid->subdevice;
839 if (id)
840 strlcpy(timer->id, id, sizeof(timer->id));
841 timer->sticks = 1;
842 INIT_LIST_HEAD(&timer->device_list);
843 INIT_LIST_HEAD(&timer->open_list_head);
844 INIT_LIST_HEAD(&timer->active_list_head);
845 INIT_LIST_HEAD(&timer->ack_list_head);
846 INIT_LIST_HEAD(&timer->sack_list_head);
847 spin_lock_init(&timer->lock);
848 tasklet_init(&timer->task_queue, snd_timer_tasklet,
849 (unsigned long)timer);
850 if (card != NULL) {
851 timer->module = card->module;
852 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
853 if (err < 0) {
854 snd_timer_free(timer);
855 return err;
856 }
857 }
858 if (rtimer)
859 *rtimer = timer;
860 return 0;
861 }
862
863 static int snd_timer_free(struct snd_timer *timer)
864 {
865 if (!timer)
866 return 0;
867
868 mutex_lock(&register_mutex);
869 if (! list_empty(&timer->open_list_head)) {
870 struct list_head *p, *n;
871 struct snd_timer_instance *ti;
872 pr_warn("ALSA: timer %p is busy?\n", timer);
873 list_for_each_safe(p, n, &timer->open_list_head) {
874 list_del_init(p);
875 ti = list_entry(p, struct snd_timer_instance, open_list);
876 ti->timer = NULL;
877 }
878 }
879 list_del(&timer->device_list);
880 mutex_unlock(&register_mutex);
881
882 if (timer->private_free)
883 timer->private_free(timer);
884 kfree(timer);
885 return 0;
886 }
887
888 static int snd_timer_dev_free(struct snd_device *device)
889 {
890 struct snd_timer *timer = device->device_data;
891 return snd_timer_free(timer);
892 }
893
894 static int snd_timer_dev_register(struct snd_device *dev)
895 {
896 struct snd_timer *timer = dev->device_data;
897 struct snd_timer *timer1;
898
899 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
900 return -ENXIO;
901 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
902 !timer->hw.resolution && timer->hw.c_resolution == NULL)
903 return -EINVAL;
904
905 mutex_lock(&register_mutex);
906 list_for_each_entry(timer1, &snd_timer_list, device_list) {
907 if (timer1->tmr_class > timer->tmr_class)
908 break;
909 if (timer1->tmr_class < timer->tmr_class)
910 continue;
911 if (timer1->card && timer->card) {
912 if (timer1->card->number > timer->card->number)
913 break;
914 if (timer1->card->number < timer->card->number)
915 continue;
916 }
917 if (timer1->tmr_device > timer->tmr_device)
918 break;
919 if (timer1->tmr_device < timer->tmr_device)
920 continue;
921 if (timer1->tmr_subdevice > timer->tmr_subdevice)
922 break;
923 if (timer1->tmr_subdevice < timer->tmr_subdevice)
924 continue;
925 /* conflicts.. */
926 mutex_unlock(&register_mutex);
927 return -EBUSY;
928 }
929 list_add_tail(&timer->device_list, &timer1->device_list);
930 mutex_unlock(&register_mutex);
931 return 0;
932 }
933
934 static int snd_timer_dev_disconnect(struct snd_device *device)
935 {
936 struct snd_timer *timer = device->device_data;
937 struct snd_timer_instance *ti;
938
939 mutex_lock(&register_mutex);
940 list_del_init(&timer->device_list);
941 /* wake up pending sleepers */
942 list_for_each_entry(ti, &timer->open_list_head, open_list) {
943 if (ti->disconnect)
944 ti->disconnect(ti);
945 }
946 mutex_unlock(&register_mutex);
947 return 0;
948 }
949
950 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
951 {
952 unsigned long flags;
953 unsigned long resolution = 0;
954 struct snd_timer_instance *ti, *ts;
955
956 if (timer->card && timer->card->shutdown)
957 return;
958 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
959 return;
960 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
961 event > SNDRV_TIMER_EVENT_MRESUME))
962 return;
963 spin_lock_irqsave(&timer->lock, flags);
964 if (event == SNDRV_TIMER_EVENT_MSTART ||
965 event == SNDRV_TIMER_EVENT_MCONTINUE ||
966 event == SNDRV_TIMER_EVENT_MRESUME) {
967 if (timer->hw.c_resolution)
968 resolution = timer->hw.c_resolution(timer);
969 else
970 resolution = timer->hw.resolution;
971 }
972 list_for_each_entry(ti, &timer->active_list_head, active_list) {
973 if (ti->ccallback)
974 ti->ccallback(ti, event, tstamp, resolution);
975 list_for_each_entry(ts, &ti->slave_active_head, active_list)
976 if (ts->ccallback)
977 ts->ccallback(ts, event, tstamp, resolution);
978 }
979 spin_unlock_irqrestore(&timer->lock, flags);
980 }
981
982 /*
983 * exported functions for global timers
984 */
985 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
986 {
987 struct snd_timer_id tid;
988
989 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
990 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
991 tid.card = -1;
992 tid.device = device;
993 tid.subdevice = 0;
994 return snd_timer_new(NULL, id, &tid, rtimer);
995 }
996
997 int snd_timer_global_free(struct snd_timer *timer)
998 {
999 return snd_timer_free(timer);
1000 }
1001
1002 int snd_timer_global_register(struct snd_timer *timer)
1003 {
1004 struct snd_device dev;
1005
1006 memset(&dev, 0, sizeof(dev));
1007 dev.device_data = timer;
1008 return snd_timer_dev_register(&dev);
1009 }
1010
1011 /*
1012 * System timer
1013 */
1014
1015 struct snd_timer_system_private {
1016 struct timer_list tlist;
1017 unsigned long last_expires;
1018 unsigned long last_jiffies;
1019 unsigned long correction;
1020 };
1021
1022 static void snd_timer_s_function(unsigned long data)
1023 {
1024 struct snd_timer *timer = (struct snd_timer *)data;
1025 struct snd_timer_system_private *priv = timer->private_data;
1026 unsigned long jiff = jiffies;
1027 if (time_after(jiff, priv->last_expires))
1028 priv->correction += (long)jiff - (long)priv->last_expires;
1029 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1030 }
1031
1032 static int snd_timer_s_start(struct snd_timer * timer)
1033 {
1034 struct snd_timer_system_private *priv;
1035 unsigned long njiff;
1036
1037 priv = (struct snd_timer_system_private *) timer->private_data;
1038 njiff = (priv->last_jiffies = jiffies);
1039 if (priv->correction > timer->sticks - 1) {
1040 priv->correction -= timer->sticks - 1;
1041 njiff++;
1042 } else {
1043 njiff += timer->sticks - priv->correction;
1044 priv->correction = 0;
1045 }
1046 priv->last_expires = njiff;
1047 mod_timer(&priv->tlist, njiff);
1048 return 0;
1049 }
1050
1051 static int snd_timer_s_stop(struct snd_timer * timer)
1052 {
1053 struct snd_timer_system_private *priv;
1054 unsigned long jiff;
1055
1056 priv = (struct snd_timer_system_private *) timer->private_data;
1057 del_timer(&priv->tlist);
1058 jiff = jiffies;
1059 if (time_before(jiff, priv->last_expires))
1060 timer->sticks = priv->last_expires - jiff;
1061 else
1062 timer->sticks = 1;
1063 priv->correction = 0;
1064 return 0;
1065 }
1066
1067 static int snd_timer_s_close(struct snd_timer *timer)
1068 {
1069 struct snd_timer_system_private *priv;
1070
1071 priv = (struct snd_timer_system_private *)timer->private_data;
1072 del_timer_sync(&priv->tlist);
1073 return 0;
1074 }
1075
1076 static struct snd_timer_hardware snd_timer_system =
1077 {
1078 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1079 .resolution = 1000000000L / HZ,
1080 .ticks = 10000000L,
1081 .close = snd_timer_s_close,
1082 .start = snd_timer_s_start,
1083 .stop = snd_timer_s_stop
1084 };
1085
1086 static void snd_timer_free_system(struct snd_timer *timer)
1087 {
1088 kfree(timer->private_data);
1089 }
1090
1091 static int snd_timer_register_system(void)
1092 {
1093 struct snd_timer *timer;
1094 struct snd_timer_system_private *priv;
1095 int err;
1096
1097 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1098 if (err < 0)
1099 return err;
1100 strcpy(timer->name, "system timer");
1101 timer->hw = snd_timer_system;
1102 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1103 if (priv == NULL) {
1104 snd_timer_free(timer);
1105 return -ENOMEM;
1106 }
1107 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1108 timer->private_data = priv;
1109 timer->private_free = snd_timer_free_system;
1110 return snd_timer_global_register(timer);
1111 }
1112
1113 #ifdef CONFIG_SND_PROC_FS
1114 /*
1115 * Info interface
1116 */
1117
1118 static void snd_timer_proc_read(struct snd_info_entry *entry,
1119 struct snd_info_buffer *buffer)
1120 {
1121 struct snd_timer *timer;
1122 struct snd_timer_instance *ti;
1123
1124 mutex_lock(&register_mutex);
1125 list_for_each_entry(timer, &snd_timer_list, device_list) {
1126 if (timer->card && timer->card->shutdown)
1127 continue;
1128 switch (timer->tmr_class) {
1129 case SNDRV_TIMER_CLASS_GLOBAL:
1130 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1131 break;
1132 case SNDRV_TIMER_CLASS_CARD:
1133 snd_iprintf(buffer, "C%i-%i: ",
1134 timer->card->number, timer->tmr_device);
1135 break;
1136 case SNDRV_TIMER_CLASS_PCM:
1137 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1138 timer->tmr_device, timer->tmr_subdevice);
1139 break;
1140 default:
1141 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1142 timer->card ? timer->card->number : -1,
1143 timer->tmr_device, timer->tmr_subdevice);
1144 }
1145 snd_iprintf(buffer, "%s :", timer->name);
1146 if (timer->hw.resolution)
1147 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1148 timer->hw.resolution / 1000,
1149 timer->hw.resolution % 1000,
1150 timer->hw.ticks);
1151 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1152 snd_iprintf(buffer, " SLAVE");
1153 snd_iprintf(buffer, "\n");
1154 list_for_each_entry(ti, &timer->open_list_head, open_list)
1155 snd_iprintf(buffer, " Client %s : %s\n",
1156 ti->owner ? ti->owner : "unknown",
1157 ti->flags & (SNDRV_TIMER_IFLG_START |
1158 SNDRV_TIMER_IFLG_RUNNING)
1159 ? "running" : "stopped");
1160 }
1161 mutex_unlock(&register_mutex);
1162 }
1163
1164 static struct snd_info_entry *snd_timer_proc_entry;
1165
1166 static void __init snd_timer_proc_init(void)
1167 {
1168 struct snd_info_entry *entry;
1169
1170 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1171 if (entry != NULL) {
1172 entry->c.text.read = snd_timer_proc_read;
1173 if (snd_info_register(entry) < 0) {
1174 snd_info_free_entry(entry);
1175 entry = NULL;
1176 }
1177 }
1178 snd_timer_proc_entry = entry;
1179 }
1180
1181 static void __exit snd_timer_proc_done(void)
1182 {
1183 snd_info_free_entry(snd_timer_proc_entry);
1184 }
1185 #else /* !CONFIG_SND_PROC_FS */
1186 #define snd_timer_proc_init()
1187 #define snd_timer_proc_done()
1188 #endif
1189
1190 /*
1191 * USER SPACE interface
1192 */
1193
1194 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1195 unsigned long resolution,
1196 unsigned long ticks)
1197 {
1198 struct snd_timer_user *tu = timeri->callback_data;
1199 struct snd_timer_read *r;
1200 int prev;
1201
1202 spin_lock(&tu->qlock);
1203 if (tu->qused > 0) {
1204 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1205 r = &tu->queue[prev];
1206 if (r->resolution == resolution) {
1207 r->ticks += ticks;
1208 goto __wake;
1209 }
1210 }
1211 if (tu->qused >= tu->queue_size) {
1212 tu->overrun++;
1213 } else {
1214 r = &tu->queue[tu->qtail++];
1215 tu->qtail %= tu->queue_size;
1216 r->resolution = resolution;
1217 r->ticks = ticks;
1218 tu->qused++;
1219 }
1220 __wake:
1221 spin_unlock(&tu->qlock);
1222 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1223 wake_up(&tu->qchange_sleep);
1224 }
1225
1226 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1227 struct snd_timer_tread *tread)
1228 {
1229 if (tu->qused >= tu->queue_size) {
1230 tu->overrun++;
1231 } else {
1232 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1233 tu->qtail %= tu->queue_size;
1234 tu->qused++;
1235 }
1236 }
1237
1238 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1239 int event,
1240 struct timespec *tstamp,
1241 unsigned long resolution)
1242 {
1243 struct snd_timer_user *tu = timeri->callback_data;
1244 struct snd_timer_tread r1;
1245 unsigned long flags;
1246
1247 if (event >= SNDRV_TIMER_EVENT_START &&
1248 event <= SNDRV_TIMER_EVENT_PAUSE)
1249 tu->tstamp = *tstamp;
1250 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1251 return;
1252 memset(&r1, 0, sizeof(r1));
1253 r1.event = event;
1254 r1.tstamp = *tstamp;
1255 r1.val = resolution;
1256 spin_lock_irqsave(&tu->qlock, flags);
1257 snd_timer_user_append_to_tqueue(tu, &r1);
1258 spin_unlock_irqrestore(&tu->qlock, flags);
1259 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1260 wake_up(&tu->qchange_sleep);
1261 }
1262
1263 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1264 {
1265 struct snd_timer_user *tu = timeri->callback_data;
1266
1267 tu->disconnected = true;
1268 wake_up(&tu->qchange_sleep);
1269 }
1270
1271 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1272 unsigned long resolution,
1273 unsigned long ticks)
1274 {
1275 struct snd_timer_user *tu = timeri->callback_data;
1276 struct snd_timer_tread *r, r1;
1277 struct timespec tstamp;
1278 int prev, append = 0;
1279
1280 memset(&r1, 0, sizeof(r1));
1281 memset(&tstamp, 0, sizeof(tstamp));
1282 spin_lock(&tu->qlock);
1283 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1284 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1285 spin_unlock(&tu->qlock);
1286 return;
1287 }
1288 if (tu->last_resolution != resolution || ticks > 0) {
1289 if (timer_tstamp_monotonic)
1290 ktime_get_ts(&tstamp);
1291 else
1292 getnstimeofday(&tstamp);
1293 }
1294 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1295 tu->last_resolution != resolution) {
1296 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1297 r1.tstamp = tstamp;
1298 r1.val = resolution;
1299 snd_timer_user_append_to_tqueue(tu, &r1);
1300 tu->last_resolution = resolution;
1301 append++;
1302 }
1303 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1304 goto __wake;
1305 if (ticks == 0)
1306 goto __wake;
1307 if (tu->qused > 0) {
1308 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1309 r = &tu->tqueue[prev];
1310 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1311 r->tstamp = tstamp;
1312 r->val += ticks;
1313 append++;
1314 goto __wake;
1315 }
1316 }
1317 r1.event = SNDRV_TIMER_EVENT_TICK;
1318 r1.tstamp = tstamp;
1319 r1.val = ticks;
1320 snd_timer_user_append_to_tqueue(tu, &r1);
1321 append++;
1322 __wake:
1323 spin_unlock(&tu->qlock);
1324 if (append == 0)
1325 return;
1326 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1327 wake_up(&tu->qchange_sleep);
1328 }
1329
1330 static int snd_timer_user_open(struct inode *inode, struct file *file)
1331 {
1332 struct snd_timer_user *tu;
1333 int err;
1334
1335 err = nonseekable_open(inode, file);
1336 if (err < 0)
1337 return err;
1338
1339 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1340 if (tu == NULL)
1341 return -ENOMEM;
1342 spin_lock_init(&tu->qlock);
1343 init_waitqueue_head(&tu->qchange_sleep);
1344 mutex_init(&tu->ioctl_lock);
1345 tu->ticks = 1;
1346 tu->queue_size = 128;
1347 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1348 GFP_KERNEL);
1349 if (tu->queue == NULL) {
1350 kfree(tu);
1351 return -ENOMEM;
1352 }
1353 file->private_data = tu;
1354 return 0;
1355 }
1356
1357 static int snd_timer_user_release(struct inode *inode, struct file *file)
1358 {
1359 struct snd_timer_user *tu;
1360
1361 if (file->private_data) {
1362 tu = file->private_data;
1363 file->private_data = NULL;
1364 mutex_lock(&tu->ioctl_lock);
1365 if (tu->timeri)
1366 snd_timer_close(tu->timeri);
1367 mutex_unlock(&tu->ioctl_lock);
1368 kfree(tu->queue);
1369 kfree(tu->tqueue);
1370 kfree(tu);
1371 }
1372 return 0;
1373 }
1374
1375 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1376 {
1377 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1378 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1379 id->card = -1;
1380 id->device = -1;
1381 id->subdevice = -1;
1382 }
1383
1384 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1385 {
1386 id->dev_class = timer->tmr_class;
1387 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1388 id->card = timer->card ? timer->card->number : -1;
1389 id->device = timer->tmr_device;
1390 id->subdevice = timer->tmr_subdevice;
1391 }
1392
1393 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1394 {
1395 struct snd_timer_id id;
1396 struct snd_timer *timer;
1397 struct list_head *p;
1398
1399 if (copy_from_user(&id, _tid, sizeof(id)))
1400 return -EFAULT;
1401 mutex_lock(&register_mutex);
1402 if (id.dev_class < 0) { /* first item */
1403 if (list_empty(&snd_timer_list))
1404 snd_timer_user_zero_id(&id);
1405 else {
1406 timer = list_entry(snd_timer_list.next,
1407 struct snd_timer, device_list);
1408 snd_timer_user_copy_id(&id, timer);
1409 }
1410 } else {
1411 switch (id.dev_class) {
1412 case SNDRV_TIMER_CLASS_GLOBAL:
1413 id.device = id.device < 0 ? 0 : id.device + 1;
1414 list_for_each(p, &snd_timer_list) {
1415 timer = list_entry(p, struct snd_timer, device_list);
1416 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1417 snd_timer_user_copy_id(&id, timer);
1418 break;
1419 }
1420 if (timer->tmr_device >= id.device) {
1421 snd_timer_user_copy_id(&id, timer);
1422 break;
1423 }
1424 }
1425 if (p == &snd_timer_list)
1426 snd_timer_user_zero_id(&id);
1427 break;
1428 case SNDRV_TIMER_CLASS_CARD:
1429 case SNDRV_TIMER_CLASS_PCM:
1430 if (id.card < 0) {
1431 id.card = 0;
1432 } else {
1433 if (id.device < 0) {
1434 id.device = 0;
1435 } else {
1436 if (id.subdevice < 0)
1437 id.subdevice = 0;
1438 else
1439 id.subdevice++;
1440 }
1441 }
1442 list_for_each(p, &snd_timer_list) {
1443 timer = list_entry(p, struct snd_timer, device_list);
1444 if (timer->tmr_class > id.dev_class) {
1445 snd_timer_user_copy_id(&id, timer);
1446 break;
1447 }
1448 if (timer->tmr_class < id.dev_class)
1449 continue;
1450 if (timer->card->number > id.card) {
1451 snd_timer_user_copy_id(&id, timer);
1452 break;
1453 }
1454 if (timer->card->number < id.card)
1455 continue;
1456 if (timer->tmr_device > id.device) {
1457 snd_timer_user_copy_id(&id, timer);
1458 break;
1459 }
1460 if (timer->tmr_device < id.device)
1461 continue;
1462 if (timer->tmr_subdevice > id.subdevice) {
1463 snd_timer_user_copy_id(&id, timer);
1464 break;
1465 }
1466 if (timer->tmr_subdevice < id.subdevice)
1467 continue;
1468 snd_timer_user_copy_id(&id, timer);
1469 break;
1470 }
1471 if (p == &snd_timer_list)
1472 snd_timer_user_zero_id(&id);
1473 break;
1474 default:
1475 snd_timer_user_zero_id(&id);
1476 }
1477 }
1478 mutex_unlock(&register_mutex);
1479 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1480 return -EFAULT;
1481 return 0;
1482 }
1483
1484 static int snd_timer_user_ginfo(struct file *file,
1485 struct snd_timer_ginfo __user *_ginfo)
1486 {
1487 struct snd_timer_ginfo *ginfo;
1488 struct snd_timer_id tid;
1489 struct snd_timer *t;
1490 struct list_head *p;
1491 int err = 0;
1492
1493 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1494 if (IS_ERR(ginfo))
1495 return PTR_ERR(ginfo);
1496
1497 tid = ginfo->tid;
1498 memset(ginfo, 0, sizeof(*ginfo));
1499 ginfo->tid = tid;
1500 mutex_lock(&register_mutex);
1501 t = snd_timer_find(&tid);
1502 if (t != NULL) {
1503 ginfo->card = t->card ? t->card->number : -1;
1504 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1505 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1506 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1507 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1508 ginfo->resolution = t->hw.resolution;
1509 if (t->hw.resolution_min > 0) {
1510 ginfo->resolution_min = t->hw.resolution_min;
1511 ginfo->resolution_max = t->hw.resolution_max;
1512 }
1513 list_for_each(p, &t->open_list_head) {
1514 ginfo->clients++;
1515 }
1516 } else {
1517 err = -ENODEV;
1518 }
1519 mutex_unlock(&register_mutex);
1520 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1521 err = -EFAULT;
1522 kfree(ginfo);
1523 return err;
1524 }
1525
1526 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1527 {
1528 struct snd_timer *t;
1529 int err;
1530
1531 mutex_lock(&register_mutex);
1532 t = snd_timer_find(&gparams->tid);
1533 if (!t) {
1534 err = -ENODEV;
1535 goto _error;
1536 }
1537 if (!list_empty(&t->open_list_head)) {
1538 err = -EBUSY;
1539 goto _error;
1540 }
1541 if (!t->hw.set_period) {
1542 err = -ENOSYS;
1543 goto _error;
1544 }
1545 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1546 _error:
1547 mutex_unlock(&register_mutex);
1548 return err;
1549 }
1550
1551 static int snd_timer_user_gparams(struct file *file,
1552 struct snd_timer_gparams __user *_gparams)
1553 {
1554 struct snd_timer_gparams gparams;
1555
1556 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1557 return -EFAULT;
1558 return timer_set_gparams(&gparams);
1559 }
1560
1561 static int snd_timer_user_gstatus(struct file *file,
1562 struct snd_timer_gstatus __user *_gstatus)
1563 {
1564 struct snd_timer_gstatus gstatus;
1565 struct snd_timer_id tid;
1566 struct snd_timer *t;
1567 int err = 0;
1568
1569 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1570 return -EFAULT;
1571 tid = gstatus.tid;
1572 memset(&gstatus, 0, sizeof(gstatus));
1573 gstatus.tid = tid;
1574 mutex_lock(&register_mutex);
1575 t = snd_timer_find(&tid);
1576 if (t != NULL) {
1577 if (t->hw.c_resolution)
1578 gstatus.resolution = t->hw.c_resolution(t);
1579 else
1580 gstatus.resolution = t->hw.resolution;
1581 if (t->hw.precise_resolution) {
1582 t->hw.precise_resolution(t, &gstatus.resolution_num,
1583 &gstatus.resolution_den);
1584 } else {
1585 gstatus.resolution_num = gstatus.resolution;
1586 gstatus.resolution_den = 1000000000uL;
1587 }
1588 } else {
1589 err = -ENODEV;
1590 }
1591 mutex_unlock(&register_mutex);
1592 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1593 err = -EFAULT;
1594 return err;
1595 }
1596
1597 static int snd_timer_user_tselect(struct file *file,
1598 struct snd_timer_select __user *_tselect)
1599 {
1600 struct snd_timer_user *tu;
1601 struct snd_timer_select tselect;
1602 char str[32];
1603 int err = 0;
1604
1605 tu = file->private_data;
1606 if (tu->timeri) {
1607 snd_timer_close(tu->timeri);
1608 tu->timeri = NULL;
1609 }
1610 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1611 err = -EFAULT;
1612 goto __err;
1613 }
1614 sprintf(str, "application %i", current->pid);
1615 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1616 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1617 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1618 if (err < 0)
1619 goto __err;
1620
1621 tu->qhead = tu->qtail = tu->qused = 0;
1622 kfree(tu->queue);
1623 tu->queue = NULL;
1624 kfree(tu->tqueue);
1625 tu->tqueue = NULL;
1626 if (tu->tread) {
1627 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1628 GFP_KERNEL);
1629 if (tu->tqueue == NULL)
1630 err = -ENOMEM;
1631 } else {
1632 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1633 GFP_KERNEL);
1634 if (tu->queue == NULL)
1635 err = -ENOMEM;
1636 }
1637
1638 if (err < 0) {
1639 snd_timer_close(tu->timeri);
1640 tu->timeri = NULL;
1641 } else {
1642 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1643 tu->timeri->callback = tu->tread
1644 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1645 tu->timeri->ccallback = snd_timer_user_ccallback;
1646 tu->timeri->callback_data = (void *)tu;
1647 tu->timeri->disconnect = snd_timer_user_disconnect;
1648 }
1649
1650 __err:
1651 return err;
1652 }
1653
1654 static int snd_timer_user_info(struct file *file,
1655 struct snd_timer_info __user *_info)
1656 {
1657 struct snd_timer_user *tu;
1658 struct snd_timer_info *info;
1659 struct snd_timer *t;
1660 int err = 0;
1661
1662 tu = file->private_data;
1663 if (!tu->timeri)
1664 return -EBADFD;
1665 t = tu->timeri->timer;
1666 if (!t)
1667 return -EBADFD;
1668
1669 info = kzalloc(sizeof(*info), GFP_KERNEL);
1670 if (! info)
1671 return -ENOMEM;
1672 info->card = t->card ? t->card->number : -1;
1673 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1674 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1675 strlcpy(info->id, t->id, sizeof(info->id));
1676 strlcpy(info->name, t->name, sizeof(info->name));
1677 info->resolution = t->hw.resolution;
1678 if (copy_to_user(_info, info, sizeof(*_info)))
1679 err = -EFAULT;
1680 kfree(info);
1681 return err;
1682 }
1683
1684 static int snd_timer_user_params(struct file *file,
1685 struct snd_timer_params __user *_params)
1686 {
1687 struct snd_timer_user *tu;
1688 struct snd_timer_params params;
1689 struct snd_timer *t;
1690 struct snd_timer_read *tr;
1691 struct snd_timer_tread *ttr;
1692 int err;
1693
1694 tu = file->private_data;
1695 if (!tu->timeri)
1696 return -EBADFD;
1697 t = tu->timeri->timer;
1698 if (!t)
1699 return -EBADFD;
1700 if (copy_from_user(&params, _params, sizeof(params)))
1701 return -EFAULT;
1702 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1703 u64 resolution;
1704
1705 if (params.ticks < 1) {
1706 err = -EINVAL;
1707 goto _end;
1708 }
1709
1710 /* Don't allow resolution less than 1ms */
1711 resolution = snd_timer_resolution(tu->timeri);
1712 resolution *= params.ticks;
1713 if (resolution < 1000000) {
1714 err = -EINVAL;
1715 goto _end;
1716 }
1717 }
1718 if (params.queue_size > 0 &&
1719 (params.queue_size < 32 || params.queue_size > 1024)) {
1720 err = -EINVAL;
1721 goto _end;
1722 }
1723 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1724 (1<<SNDRV_TIMER_EVENT_TICK)|
1725 (1<<SNDRV_TIMER_EVENT_START)|
1726 (1<<SNDRV_TIMER_EVENT_STOP)|
1727 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1728 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1729 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1730 (1<<SNDRV_TIMER_EVENT_RESUME)|
1731 (1<<SNDRV_TIMER_EVENT_MSTART)|
1732 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1733 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1734 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1735 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1736 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1737 err = -EINVAL;
1738 goto _end;
1739 }
1740 snd_timer_stop(tu->timeri);
1741 spin_lock_irq(&t->lock);
1742 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1743 SNDRV_TIMER_IFLG_EXCLUSIVE|
1744 SNDRV_TIMER_IFLG_EARLY_EVENT);
1745 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1746 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1747 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1748 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1749 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1750 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1751 spin_unlock_irq(&t->lock);
1752 if (params.queue_size > 0 &&
1753 (unsigned int)tu->queue_size != params.queue_size) {
1754 if (tu->tread) {
1755 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1756 GFP_KERNEL);
1757 if (ttr) {
1758 kfree(tu->tqueue);
1759 tu->queue_size = params.queue_size;
1760 tu->tqueue = ttr;
1761 }
1762 } else {
1763 tr = kmalloc(params.queue_size * sizeof(*tr),
1764 GFP_KERNEL);
1765 if (tr) {
1766 kfree(tu->queue);
1767 tu->queue_size = params.queue_size;
1768 tu->queue = tr;
1769 }
1770 }
1771 }
1772 tu->qhead = tu->qtail = tu->qused = 0;
1773 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1774 if (tu->tread) {
1775 struct snd_timer_tread tread;
1776 memset(&tread, 0, sizeof(tread));
1777 tread.event = SNDRV_TIMER_EVENT_EARLY;
1778 tread.tstamp.tv_sec = 0;
1779 tread.tstamp.tv_nsec = 0;
1780 tread.val = 0;
1781 snd_timer_user_append_to_tqueue(tu, &tread);
1782 } else {
1783 struct snd_timer_read *r = &tu->queue[0];
1784 r->resolution = 0;
1785 r->ticks = 0;
1786 tu->qused++;
1787 tu->qtail++;
1788 }
1789 }
1790 tu->filter = params.filter;
1791 tu->ticks = params.ticks;
1792 err = 0;
1793 _end:
1794 if (copy_to_user(_params, &params, sizeof(params)))
1795 return -EFAULT;
1796 return err;
1797 }
1798
1799 static int snd_timer_user_status(struct file *file,
1800 struct snd_timer_status __user *_status)
1801 {
1802 struct snd_timer_user *tu;
1803 struct snd_timer_status status;
1804
1805 tu = file->private_data;
1806 if (!tu->timeri)
1807 return -EBADFD;
1808 memset(&status, 0, sizeof(status));
1809 status.tstamp = tu->tstamp;
1810 status.resolution = snd_timer_resolution(tu->timeri);
1811 status.lost = tu->timeri->lost;
1812 status.overrun = tu->overrun;
1813 spin_lock_irq(&tu->qlock);
1814 status.queue = tu->qused;
1815 spin_unlock_irq(&tu->qlock);
1816 if (copy_to_user(_status, &status, sizeof(status)))
1817 return -EFAULT;
1818 return 0;
1819 }
1820
1821 static int snd_timer_user_start(struct file *file)
1822 {
1823 int err;
1824 struct snd_timer_user *tu;
1825
1826 tu = file->private_data;
1827 if (!tu->timeri)
1828 return -EBADFD;
1829 snd_timer_stop(tu->timeri);
1830 tu->timeri->lost = 0;
1831 tu->last_resolution = 0;
1832 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1833 }
1834
1835 static int snd_timer_user_stop(struct file *file)
1836 {
1837 int err;
1838 struct snd_timer_user *tu;
1839
1840 tu = file->private_data;
1841 if (!tu->timeri)
1842 return -EBADFD;
1843 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1844 }
1845
1846 static int snd_timer_user_continue(struct file *file)
1847 {
1848 int err;
1849 struct snd_timer_user *tu;
1850
1851 tu = file->private_data;
1852 if (!tu->timeri)
1853 return -EBADFD;
1854 /* start timer instead of continue if it's not used before */
1855 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1856 return snd_timer_user_start(file);
1857 tu->timeri->lost = 0;
1858 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1859 }
1860
1861 static int snd_timer_user_pause(struct file *file)
1862 {
1863 int err;
1864 struct snd_timer_user *tu;
1865
1866 tu = file->private_data;
1867 if (!tu->timeri)
1868 return -EBADFD;
1869 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1870 }
1871
1872 enum {
1873 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1874 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1875 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1876 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1877 };
1878
1879 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1880 unsigned long arg)
1881 {
1882 struct snd_timer_user *tu;
1883 void __user *argp = (void __user *)arg;
1884 int __user *p = argp;
1885
1886 tu = file->private_data;
1887 switch (cmd) {
1888 case SNDRV_TIMER_IOCTL_PVERSION:
1889 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1890 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1891 return snd_timer_user_next_device(argp);
1892 case SNDRV_TIMER_IOCTL_TREAD:
1893 {
1894 int xarg;
1895
1896 if (tu->timeri) /* too late */
1897 return -EBUSY;
1898 if (get_user(xarg, p))
1899 return -EFAULT;
1900 tu->tread = xarg ? 1 : 0;
1901 return 0;
1902 }
1903 case SNDRV_TIMER_IOCTL_GINFO:
1904 return snd_timer_user_ginfo(file, argp);
1905 case SNDRV_TIMER_IOCTL_GPARAMS:
1906 return snd_timer_user_gparams(file, argp);
1907 case SNDRV_TIMER_IOCTL_GSTATUS:
1908 return snd_timer_user_gstatus(file, argp);
1909 case SNDRV_TIMER_IOCTL_SELECT:
1910 return snd_timer_user_tselect(file, argp);
1911 case SNDRV_TIMER_IOCTL_INFO:
1912 return snd_timer_user_info(file, argp);
1913 case SNDRV_TIMER_IOCTL_PARAMS:
1914 return snd_timer_user_params(file, argp);
1915 case SNDRV_TIMER_IOCTL_STATUS:
1916 return snd_timer_user_status(file, argp);
1917 case SNDRV_TIMER_IOCTL_START:
1918 case SNDRV_TIMER_IOCTL_START_OLD:
1919 return snd_timer_user_start(file);
1920 case SNDRV_TIMER_IOCTL_STOP:
1921 case SNDRV_TIMER_IOCTL_STOP_OLD:
1922 return snd_timer_user_stop(file);
1923 case SNDRV_TIMER_IOCTL_CONTINUE:
1924 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1925 return snd_timer_user_continue(file);
1926 case SNDRV_TIMER_IOCTL_PAUSE:
1927 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1928 return snd_timer_user_pause(file);
1929 }
1930 return -ENOTTY;
1931 }
1932
1933 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1934 unsigned long arg)
1935 {
1936 struct snd_timer_user *tu = file->private_data;
1937 long ret;
1938
1939 mutex_lock(&tu->ioctl_lock);
1940 ret = __snd_timer_user_ioctl(file, cmd, arg);
1941 mutex_unlock(&tu->ioctl_lock);
1942 return ret;
1943 }
1944
1945 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1946 {
1947 struct snd_timer_user *tu;
1948
1949 tu = file->private_data;
1950 return fasync_helper(fd, file, on, &tu->fasync);
1951 }
1952
1953 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1954 size_t count, loff_t *offset)
1955 {
1956 struct snd_timer_user *tu;
1957 long result = 0, unit;
1958 int qhead;
1959 int err = 0;
1960
1961 tu = file->private_data;
1962 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1963 mutex_lock(&tu->ioctl_lock);
1964 spin_lock_irq(&tu->qlock);
1965 while ((long)count - result >= unit) {
1966 while (!tu->qused) {
1967 wait_queue_t wait;
1968
1969 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1970 err = -EAGAIN;
1971 goto _error;
1972 }
1973
1974 set_current_state(TASK_INTERRUPTIBLE);
1975 init_waitqueue_entry(&wait, current);
1976 add_wait_queue(&tu->qchange_sleep, &wait);
1977
1978 spin_unlock_irq(&tu->qlock);
1979 mutex_unlock(&tu->ioctl_lock);
1980 schedule();
1981 mutex_lock(&tu->ioctl_lock);
1982 spin_lock_irq(&tu->qlock);
1983
1984 remove_wait_queue(&tu->qchange_sleep, &wait);
1985
1986 if (tu->disconnected) {
1987 err = -ENODEV;
1988 goto _error;
1989 }
1990 if (signal_pending(current)) {
1991 err = -ERESTARTSYS;
1992 goto _error;
1993 }
1994 }
1995
1996 qhead = tu->qhead++;
1997 tu->qhead %= tu->queue_size;
1998 tu->qused--;
1999 spin_unlock_irq(&tu->qlock);
2000
2001 if (tu->tread) {
2002 if (copy_to_user(buffer, &tu->tqueue[qhead],
2003 sizeof(struct snd_timer_tread)))
2004 err = -EFAULT;
2005 } else {
2006 if (copy_to_user(buffer, &tu->queue[qhead],
2007 sizeof(struct snd_timer_read)))
2008 err = -EFAULT;
2009 }
2010
2011 spin_lock_irq(&tu->qlock);
2012 if (err < 0)
2013 goto _error;
2014 result += unit;
2015 buffer += unit;
2016 }
2017 _error:
2018 spin_unlock_irq(&tu->qlock);
2019 mutex_unlock(&tu->ioctl_lock);
2020 return result > 0 ? result : err;
2021 }
2022
2023 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
2024 {
2025 unsigned int mask;
2026 struct snd_timer_user *tu;
2027
2028 tu = file->private_data;
2029
2030 poll_wait(file, &tu->qchange_sleep, wait);
2031
2032 mask = 0;
2033 if (tu->qused)
2034 mask |= POLLIN | POLLRDNORM;
2035 if (tu->disconnected)
2036 mask |= POLLERR;
2037
2038 return mask;
2039 }
2040
2041 #ifdef CONFIG_COMPAT
2042 #include "timer_compat.c"
2043 #else
2044 #define snd_timer_user_ioctl_compat NULL
2045 #endif
2046
2047 static const struct file_operations snd_timer_f_ops =
2048 {
2049 .owner = THIS_MODULE,
2050 .read = snd_timer_user_read,
2051 .open = snd_timer_user_open,
2052 .release = snd_timer_user_release,
2053 .llseek = no_llseek,
2054 .poll = snd_timer_user_poll,
2055 .unlocked_ioctl = snd_timer_user_ioctl,
2056 .compat_ioctl = snd_timer_user_ioctl_compat,
2057 .fasync = snd_timer_user_fasync,
2058 };
2059
2060 /* unregister the system timer */
2061 static void snd_timer_free_all(void)
2062 {
2063 struct snd_timer *timer, *n;
2064
2065 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2066 snd_timer_free(timer);
2067 }
2068
2069 static struct device timer_dev;
2070
2071 /*
2072 * ENTRY functions
2073 */
2074
2075 static int __init alsa_timer_init(void)
2076 {
2077 int err;
2078
2079 snd_device_initialize(&timer_dev, NULL);
2080 dev_set_name(&timer_dev, "timer");
2081
2082 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2083 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2084 "system timer");
2085 #endif
2086
2087 err = snd_timer_register_system();
2088 if (err < 0) {
2089 pr_err("ALSA: unable to register system timer (%i)\n", err);
2090 put_device(&timer_dev);
2091 return err;
2092 }
2093
2094 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2095 &snd_timer_f_ops, NULL, &timer_dev);
2096 if (err < 0) {
2097 pr_err("ALSA: unable to register timer device (%i)\n", err);
2098 snd_timer_free_all();
2099 put_device(&timer_dev);
2100 return err;
2101 }
2102
2103 snd_timer_proc_init();
2104 return 0;
2105 }
2106
2107 static void __exit alsa_timer_exit(void)
2108 {
2109 snd_unregister_device(&timer_dev);
2110 snd_timer_free_all();
2111 put_device(&timer_dev);
2112 snd_timer_proc_done();
2113 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2114 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2115 #endif
2116 }
2117
2118 module_init(alsa_timer_init)
2119 module_exit(alsa_timer_exit)
2120
2121 EXPORT_SYMBOL(snd_timer_open);
2122 EXPORT_SYMBOL(snd_timer_close);
2123 EXPORT_SYMBOL(snd_timer_resolution);
2124 EXPORT_SYMBOL(snd_timer_start);
2125 EXPORT_SYMBOL(snd_timer_stop);
2126 EXPORT_SYMBOL(snd_timer_continue);
2127 EXPORT_SYMBOL(snd_timer_pause);
2128 EXPORT_SYMBOL(snd_timer_new);
2129 EXPORT_SYMBOL(snd_timer_notify);
2130 EXPORT_SYMBOL(snd_timer_global_new);
2131 EXPORT_SYMBOL(snd_timer_global_free);
2132 EXPORT_SYMBOL(snd_timer_global_register);
2133 EXPORT_SYMBOL(snd_timer_interrupt);
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