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USB: serial: kobil_sct: add missing version error handling
[linux/fpc-iii.git] / sound / core / timer.c
blob665089c455603c0c683144c419981f8215780e85
1 /*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <linux/device.h>
28 #include <linux/module.h>
29 #include <linux/string.h>
30 #include <linux/sched/signal.h>
31 #include <sound/core.h>
32 #include <sound/timer.h>
33 #include <sound/control.h>
34 #include <sound/info.h>
35 #include <sound/minors.h>
36 #include <sound/initval.h>
37 #include <linux/kmod.h>
38
39 /* internal flags */
40 #define SNDRV_TIMER_IFLG_PAUSED 0x00010000
41
42 #if IS_ENABLED(CONFIG_SND_HRTIMER)
43 #define DEFAULT_TIMER_LIMIT 4
44 #else
45 #define DEFAULT_TIMER_LIMIT 1
46 #endif
47
48 static int timer_limit = DEFAULT_TIMER_LIMIT;
49 static int timer_tstamp_monotonic = 1;
50 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
51 MODULE_DESCRIPTION("ALSA timer interface");
52 MODULE_LICENSE("GPL");
53 module_param(timer_limit, int, 0444);
54 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
55 module_param(timer_tstamp_monotonic, int, 0444);
56 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
57
58 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
59 MODULE_ALIAS("devname:snd/timer");
60
61 struct snd_timer_user {
62 struct snd_timer_instance *timeri;
63 int tread; /* enhanced read with timestamps and events */
64 unsigned long ticks;
65 unsigned long overrun;
66 int qhead;
67 int qtail;
68 int qused;
69 int queue_size;
70 bool disconnected;
71 struct snd_timer_read *queue;
72 struct snd_timer_tread *tqueue;
73 spinlock_t qlock;
74 unsigned long last_resolution;
75 unsigned int filter;
76 struct timespec tstamp; /* trigger tstamp */
77 wait_queue_head_t qchange_sleep;
78 struct fasync_struct *fasync;
79 struct mutex ioctl_lock;
80 };
81
82 /* list of timers */
83 static LIST_HEAD(snd_timer_list);
84
85 /* list of slave instances */
86 static LIST_HEAD(snd_timer_slave_list);
87
88 /* lock for slave active lists */
89 static DEFINE_SPINLOCK(slave_active_lock);
90
91 static DEFINE_MUTEX(register_mutex);
92
93 static int snd_timer_free(struct snd_timer *timer);
94 static int snd_timer_dev_free(struct snd_device *device);
95 static int snd_timer_dev_register(struct snd_device *device);
96 static int snd_timer_dev_disconnect(struct snd_device *device);
97
98 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
99
100 /*
101 * create a timer instance with the given owner string.
102 * when timer is not NULL, increments the module counter
103 */
104 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
105 struct snd_timer *timer)
106 {
107 struct snd_timer_instance *timeri;
108 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
109 if (timeri == NULL)
110 return NULL;
111 timeri->owner = kstrdup(owner, GFP_KERNEL);
112 if (! timeri->owner) {
113 kfree(timeri);
114 return NULL;
115 }
116 INIT_LIST_HEAD(&timeri->open_list);
117 INIT_LIST_HEAD(&timeri->active_list);
118 INIT_LIST_HEAD(&timeri->ack_list);
119 INIT_LIST_HEAD(&timeri->slave_list_head);
120 INIT_LIST_HEAD(&timeri->slave_active_head);
121
122 timeri->timer = timer;
123 if (timer && !try_module_get(timer->module)) {
124 kfree(timeri->owner);
125 kfree(timeri);
126 return NULL;
127 }
128
129 return timeri;
130 }
131
132 /*
133 * find a timer instance from the given timer id
134 */
135 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
136 {
137 struct snd_timer *timer = NULL;
138
139 list_for_each_entry(timer, &snd_timer_list, device_list) {
140 if (timer->tmr_class != tid->dev_class)
141 continue;
142 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
143 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
144 (timer->card == NULL ||
145 timer->card->number != tid->card))
146 continue;
147 if (timer->tmr_device != tid->device)
148 continue;
149 if (timer->tmr_subdevice != tid->subdevice)
150 continue;
151 return timer;
152 }
153 return NULL;
154 }
155
156 #ifdef CONFIG_MODULES
157
158 static void snd_timer_request(struct snd_timer_id *tid)
159 {
160 switch (tid->dev_class) {
161 case SNDRV_TIMER_CLASS_GLOBAL:
162 if (tid->device < timer_limit)
163 request_module("snd-timer-%i", tid->device);
164 break;
165 case SNDRV_TIMER_CLASS_CARD:
166 case SNDRV_TIMER_CLASS_PCM:
167 if (tid->card < snd_ecards_limit)
168 request_module("snd-card-%i", tid->card);
169 break;
170 default:
171 break;
172 }
173 }
174
175 #endif
176
177 /*
178 * look for a master instance matching with the slave id of the given slave.
179 * when found, relink the open_link of the slave.
180 *
181 * call this with register_mutex down.
182 */
183 static int snd_timer_check_slave(struct snd_timer_instance *slave)
184 {
185 struct snd_timer *timer;
186 struct snd_timer_instance *master;
187
188 /* FIXME: it's really dumb to look up all entries.. */
189 list_for_each_entry(timer, &snd_timer_list, device_list) {
190 list_for_each_entry(master, &timer->open_list_head, open_list) {
191 if (slave->slave_class == master->slave_class &&
192 slave->slave_id == master->slave_id) {
193 if (master->timer->num_instances >=
194 master->timer->max_instances)
195 return -EBUSY;
196 list_move_tail(&slave->open_list,
197 &master->slave_list_head);
198 master->timer->num_instances++;
199 spin_lock_irq(&slave_active_lock);
200 slave->master = master;
201 slave->timer = master->timer;
202 spin_unlock_irq(&slave_active_lock);
203 return 0;
204 }
205 }
206 }
207 return 0;
208 }
209
210 /*
211 * look for slave instances matching with the slave id of the given master.
212 * when found, relink the open_link of slaves.
213 *
214 * call this with register_mutex down.
215 */
216 static int snd_timer_check_master(struct snd_timer_instance *master)
217 {
218 struct snd_timer_instance *slave, *tmp;
219
220 /* check all pending slaves */
221 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
222 if (slave->slave_class == master->slave_class &&
223 slave->slave_id == master->slave_id) {
224 if (master->timer->num_instances >=
225 master->timer->max_instances)
226 return -EBUSY;
227 list_move_tail(&slave->open_list, &master->slave_list_head);
228 master->timer->num_instances++;
229 spin_lock_irq(&slave_active_lock);
230 spin_lock(&master->timer->lock);
231 slave->master = master;
232 slave->timer = master->timer;
233 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
234 list_add_tail(&slave->active_list,
235 &master->slave_active_head);
236 spin_unlock(&master->timer->lock);
237 spin_unlock_irq(&slave_active_lock);
238 }
239 }
240 return 0;
241 }
242
243 static int snd_timer_close_locked(struct snd_timer_instance *timeri);
244
245 /*
246 * open a timer instance
247 * when opening a master, the slave id must be here given.
248 */
249 int snd_timer_open(struct snd_timer_instance **ti,
250 char *owner, struct snd_timer_id *tid,
251 unsigned int slave_id)
252 {
253 struct snd_timer *timer;
254 struct snd_timer_instance *timeri = NULL;
255 int err;
256
257 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
258 /* open a slave instance */
259 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
260 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
261 pr_debug("ALSA: timer: invalid slave class %i\n",
262 tid->dev_sclass);
263 return -EINVAL;
264 }
265 mutex_lock(&register_mutex);
266 timeri = snd_timer_instance_new(owner, NULL);
267 if (!timeri) {
268 mutex_unlock(&register_mutex);
269 return -ENOMEM;
270 }
271 timeri->slave_class = tid->dev_sclass;
272 timeri->slave_id = tid->device;
273 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
274 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
275 err = snd_timer_check_slave(timeri);
276 if (err < 0) {
277 snd_timer_close_locked(timeri);
278 timeri = NULL;
279 }
280 mutex_unlock(&register_mutex);
281 *ti = timeri;
282 return err;
283 }
284
285 /* open a master instance */
286 mutex_lock(&register_mutex);
287 timer = snd_timer_find(tid);
288 #ifdef CONFIG_MODULES
289 if (!timer) {
290 mutex_unlock(&register_mutex);
291 snd_timer_request(tid);
292 mutex_lock(&register_mutex);
293 timer = snd_timer_find(tid);
294 }
295 #endif
296 if (!timer) {
297 mutex_unlock(&register_mutex);
298 return -ENODEV;
299 }
300 if (!list_empty(&timer->open_list_head)) {
301 timeri = list_entry(timer->open_list_head.next,
302 struct snd_timer_instance, open_list);
303 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
304 mutex_unlock(&register_mutex);
305 return -EBUSY;
306 }
307 }
308 if (timer->num_instances >= timer->max_instances) {
309 mutex_unlock(&register_mutex);
310 return -EBUSY;
311 }
312 timeri = snd_timer_instance_new(owner, timer);
313 if (!timeri) {
314 mutex_unlock(&register_mutex);
315 return -ENOMEM;
316 }
317 /* take a card refcount for safe disconnection */
318 if (timer->card)
319 get_device(&timer->card->card_dev);
320 timeri->slave_class = tid->dev_sclass;
321 timeri->slave_id = slave_id;
322
323 if (list_empty(&timer->open_list_head) && timer->hw.open) {
324 int err = timer->hw.open(timer);
325 if (err) {
326 kfree(timeri->owner);
327 kfree(timeri);
328
329 if (timer->card)
330 put_device(&timer->card->card_dev);
331 module_put(timer->module);
332 mutex_unlock(&register_mutex);
333 return err;
334 }
335 }
336
337 list_add_tail(&timeri->open_list, &timer->open_list_head);
338 timer->num_instances++;
339 err = snd_timer_check_master(timeri);
340 if (err < 0) {
341 snd_timer_close_locked(timeri);
342 timeri = NULL;
343 }
344 mutex_unlock(&register_mutex);
345 *ti = timeri;
346 return err;
347 }
348 EXPORT_SYMBOL(snd_timer_open);
349
350 /*
351 * close a timer instance
352 * call this with register_mutex down.
353 */
354 static int snd_timer_close_locked(struct snd_timer_instance *timeri)
355 {
356 struct snd_timer *timer = NULL;
357 struct snd_timer_instance *slave, *tmp;
358
359 list_del(&timeri->open_list);
360
361 /* force to stop the timer */
362 snd_timer_stop(timeri);
363
364 timer = timeri->timer;
365 if (timer) {
366 timer->num_instances--;
367 /* wait, until the active callback is finished */
368 spin_lock_irq(&timer->lock);
369 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
370 spin_unlock_irq(&timer->lock);
371 udelay(10);
372 spin_lock_irq(&timer->lock);
373 }
374 spin_unlock_irq(&timer->lock);
375
376 /* remove slave links */
377 spin_lock_irq(&slave_active_lock);
378 spin_lock(&timer->lock);
379 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
380 open_list) {
381 list_move_tail(&slave->open_list, &snd_timer_slave_list);
382 timer->num_instances--;
383 slave->master = NULL;
384 slave->timer = NULL;
385 list_del_init(&slave->ack_list);
386 list_del_init(&slave->active_list);
387 }
388 spin_unlock(&timer->lock);
389 spin_unlock_irq(&slave_active_lock);
390
391 /* slave doesn't need to release timer resources below */
392 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
393 timer = NULL;
394 }
395
396 if (timeri->private_free)
397 timeri->private_free(timeri);
398 kfree(timeri->owner);
399 kfree(timeri);
400
401 if (timer) {
402 if (list_empty(&timer->open_list_head) && timer->hw.close)
403 timer->hw.close(timer);
404 /* release a card refcount for safe disconnection */
405 if (timer->card)
406 put_device(&timer->card->card_dev);
407 module_put(timer->module);
408 }
409
410 return 0;
411 }
412
413 /*
414 * close a timer instance
415 */
416 int snd_timer_close(struct snd_timer_instance *timeri)
417 {
418 int err;
419
420 if (snd_BUG_ON(!timeri))
421 return -ENXIO;
422
423 mutex_lock(&register_mutex);
424 err = snd_timer_close_locked(timeri);
425 mutex_unlock(&register_mutex);
426 return err;
427 }
428 EXPORT_SYMBOL(snd_timer_close);
429
430 static unsigned long snd_timer_hw_resolution(struct snd_timer *timer)
431 {
432 if (timer->hw.c_resolution)
433 return timer->hw.c_resolution(timer);
434 else
435 return timer->hw.resolution;
436 }
437
438 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
439 {
440 struct snd_timer * timer;
441 unsigned long ret = 0;
442 unsigned long flags;
443
444 if (timeri == NULL)
445 return 0;
446 timer = timeri->timer;
447 if (timer) {
448 spin_lock_irqsave(&timer->lock, flags);
449 ret = snd_timer_hw_resolution(timer);
450 spin_unlock_irqrestore(&timer->lock, flags);
451 }
452 return ret;
453 }
454 EXPORT_SYMBOL(snd_timer_resolution);
455
456 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
457 {
458 struct snd_timer *timer = ti->timer;
459 unsigned long resolution = 0;
460 struct snd_timer_instance *ts;
461 struct timespec tstamp;
462
463 if (timer_tstamp_monotonic)
464 ktime_get_ts(&tstamp);
465 else
466 getnstimeofday(&tstamp);
467 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
468 event > SNDRV_TIMER_EVENT_PAUSE))
469 return;
470 if (timer &&
471 (event == SNDRV_TIMER_EVENT_START ||
472 event == SNDRV_TIMER_EVENT_CONTINUE))
473 resolution = snd_timer_hw_resolution(timer);
474 if (ti->ccallback)
475 ti->ccallback(ti, event, &tstamp, resolution);
476 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
477 return;
478 if (timer == NULL)
479 return;
480 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
481 return;
482 list_for_each_entry(ts, &ti->slave_active_head, active_list)
483 if (ts->ccallback)
484 ts->ccallback(ts, event + 100, &tstamp, resolution);
485 }
486
487 /* start/continue a master timer */
488 static int snd_timer_start1(struct snd_timer_instance *timeri,
489 bool start, unsigned long ticks)
490 {
491 struct snd_timer *timer;
492 int result;
493 unsigned long flags;
494
495 timer = timeri->timer;
496 if (!timer)
497 return -EINVAL;
498
499 spin_lock_irqsave(&timer->lock, flags);
500 if (timer->card && timer->card->shutdown) {
501 result = -ENODEV;
502 goto unlock;
503 }
504 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
505 SNDRV_TIMER_IFLG_START)) {
506 result = -EBUSY;
507 goto unlock;
508 }
509
510 if (start)
511 timeri->ticks = timeri->cticks = ticks;
512 else if (!timeri->cticks)
513 timeri->cticks = 1;
514 timeri->pticks = 0;
515
516 list_move_tail(&timeri->active_list, &timer->active_list_head);
517 if (timer->running) {
518 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
519 goto __start_now;
520 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
521 timeri->flags |= SNDRV_TIMER_IFLG_START;
522 result = 1; /* delayed start */
523 } else {
524 if (start)
525 timer->sticks = ticks;
526 timer->hw.start(timer);
527 __start_now:
528 timer->running++;
529 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
530 result = 0;
531 }
532 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
533 SNDRV_TIMER_EVENT_CONTINUE);
534 unlock:
535 spin_unlock_irqrestore(&timer->lock, flags);
536 return result;
537 }
538
539 /* start/continue a slave timer */
540 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
541 bool start)
542 {
543 unsigned long flags;
544
545 spin_lock_irqsave(&slave_active_lock, flags);
546 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
547 spin_unlock_irqrestore(&slave_active_lock, flags);
548 return -EBUSY;
549 }
550 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
551 if (timeri->master && timeri->timer) {
552 spin_lock(&timeri->timer->lock);
553 list_add_tail(&timeri->active_list,
554 &timeri->master->slave_active_head);
555 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
556 SNDRV_TIMER_EVENT_CONTINUE);
557 spin_unlock(&timeri->timer->lock);
558 }
559 spin_unlock_irqrestore(&slave_active_lock, flags);
560 return 1; /* delayed start */
561 }
562
563 /* stop/pause a master timer */
564 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
565 {
566 struct snd_timer *timer;
567 int result = 0;
568 unsigned long flags;
569
570 timer = timeri->timer;
571 if (!timer)
572 return -EINVAL;
573 spin_lock_irqsave(&timer->lock, flags);
574 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
575 SNDRV_TIMER_IFLG_START))) {
576 result = -EBUSY;
577 goto unlock;
578 }
579 list_del_init(&timeri->ack_list);
580 list_del_init(&timeri->active_list);
581 if (timer->card && timer->card->shutdown)
582 goto unlock;
583 if (stop) {
584 timeri->cticks = timeri->ticks;
585 timeri->pticks = 0;
586 }
587 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
588 !(--timer->running)) {
589 timer->hw.stop(timer);
590 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
591 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
592 snd_timer_reschedule(timer, 0);
593 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
594 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
595 timer->hw.start(timer);
596 }
597 }
598 }
599 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
600 if (stop)
601 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
602 else
603 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
604 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
605 SNDRV_TIMER_EVENT_PAUSE);
606 unlock:
607 spin_unlock_irqrestore(&timer->lock, flags);
608 return result;
609 }
610
611 /* stop/pause a slave timer */
612 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
613 {
614 unsigned long flags;
615
616 spin_lock_irqsave(&slave_active_lock, flags);
617 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
618 spin_unlock_irqrestore(&slave_active_lock, flags);
619 return -EBUSY;
620 }
621 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
622 if (timeri->timer) {
623 spin_lock(&timeri->timer->lock);
624 list_del_init(&timeri->ack_list);
625 list_del_init(&timeri->active_list);
626 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
627 SNDRV_TIMER_EVENT_PAUSE);
628 spin_unlock(&timeri->timer->lock);
629 }
630 spin_unlock_irqrestore(&slave_active_lock, flags);
631 return 0;
632 }
633
634 /*
635 * start the timer instance
636 */
637 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
638 {
639 if (timeri == NULL || ticks < 1)
640 return -EINVAL;
641 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
642 return snd_timer_start_slave(timeri, true);
643 else
644 return snd_timer_start1(timeri, true, ticks);
645 }
646 EXPORT_SYMBOL(snd_timer_start);
647
648 /*
649 * stop the timer instance.
650 *
651 * do not call this from the timer callback!
652 */
653 int snd_timer_stop(struct snd_timer_instance *timeri)
654 {
655 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
656 return snd_timer_stop_slave(timeri, true);
657 else
658 return snd_timer_stop1(timeri, true);
659 }
660 EXPORT_SYMBOL(snd_timer_stop);
661
662 /*
663 * start again.. the tick is kept.
664 */
665 int snd_timer_continue(struct snd_timer_instance *timeri)
666 {
667 /* timer can continue only after pause */
668 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
669 return -EINVAL;
670
671 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
672 return snd_timer_start_slave(timeri, false);
673 else
674 return snd_timer_start1(timeri, false, 0);
675 }
676 EXPORT_SYMBOL(snd_timer_continue);
677
678 /*
679 * pause.. remember the ticks left
680 */
681 int snd_timer_pause(struct snd_timer_instance * timeri)
682 {
683 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
684 return snd_timer_stop_slave(timeri, false);
685 else
686 return snd_timer_stop1(timeri, false);
687 }
688 EXPORT_SYMBOL(snd_timer_pause);
689
690 /*
691 * reschedule the timer
692 *
693 * start pending instances and check the scheduling ticks.
694 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
695 */
696 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
697 {
698 struct snd_timer_instance *ti;
699 unsigned long ticks = ~0UL;
700
701 list_for_each_entry(ti, &timer->active_list_head, active_list) {
702 if (ti->flags & SNDRV_TIMER_IFLG_START) {
703 ti->flags &= ~SNDRV_TIMER_IFLG_START;
704 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
705 timer->running++;
706 }
707 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
708 if (ticks > ti->cticks)
709 ticks = ti->cticks;
710 }
711 }
712 if (ticks == ~0UL) {
713 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
714 return;
715 }
716 if (ticks > timer->hw.ticks)
717 ticks = timer->hw.ticks;
718 if (ticks_left != ticks)
719 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
720 timer->sticks = ticks;
721 }
722
723 /*
724 * timer tasklet
725 *
726 */
727 static void snd_timer_tasklet(unsigned long arg)
728 {
729 struct snd_timer *timer = (struct snd_timer *) arg;
730 struct snd_timer_instance *ti;
731 struct list_head *p;
732 unsigned long resolution, ticks;
733 unsigned long flags;
734
735 if (timer->card && timer->card->shutdown)
736 return;
737
738 spin_lock_irqsave(&timer->lock, flags);
739 /* now process all callbacks */
740 while (!list_empty(&timer->sack_list_head)) {
741 p = timer->sack_list_head.next; /* get first item */
742 ti = list_entry(p, struct snd_timer_instance, ack_list);
743
744 /* remove from ack_list and make empty */
745 list_del_init(p);
746
747 ticks = ti->pticks;
748 ti->pticks = 0;
749 resolution = ti->resolution;
750
751 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
752 spin_unlock(&timer->lock);
753 if (ti->callback)
754 ti->callback(ti, resolution, ticks);
755 spin_lock(&timer->lock);
756 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
757 }
758 spin_unlock_irqrestore(&timer->lock, flags);
759 }
760
761 /*
762 * timer interrupt
763 *
764 * ticks_left is usually equal to timer->sticks.
765 *
766 */
767 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
768 {
769 struct snd_timer_instance *ti, *ts, *tmp;
770 unsigned long resolution, ticks;
771 struct list_head *p, *ack_list_head;
772 unsigned long flags;
773 int use_tasklet = 0;
774
775 if (timer == NULL)
776 return;
777
778 if (timer->card && timer->card->shutdown)
779 return;
780
781 spin_lock_irqsave(&timer->lock, flags);
782
783 /* remember the current resolution */
784 resolution = snd_timer_hw_resolution(timer);
785
786 /* loop for all active instances
787 * Here we cannot use list_for_each_entry because the active_list of a
788 * processed instance is relinked to done_list_head before the callback
789 * is called.
790 */
791 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
792 active_list) {
793 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
794 continue;
795 ti->pticks += ticks_left;
796 ti->resolution = resolution;
797 if (ti->cticks < ticks_left)
798 ti->cticks = 0;
799 else
800 ti->cticks -= ticks_left;
801 if (ti->cticks) /* not expired */
802 continue;
803 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
804 ti->cticks = ti->ticks;
805 } else {
806 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
807 --timer->running;
808 list_del_init(&ti->active_list);
809 }
810 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
811 (ti->flags & SNDRV_TIMER_IFLG_FAST))
812 ack_list_head = &timer->ack_list_head;
813 else
814 ack_list_head = &timer->sack_list_head;
815 if (list_empty(&ti->ack_list))
816 list_add_tail(&ti->ack_list, ack_list_head);
817 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
818 ts->pticks = ti->pticks;
819 ts->resolution = resolution;
820 if (list_empty(&ts->ack_list))
821 list_add_tail(&ts->ack_list, ack_list_head);
822 }
823 }
824 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
825 snd_timer_reschedule(timer, timer->sticks);
826 if (timer->running) {
827 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
828 timer->hw.stop(timer);
829 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
830 }
831 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
832 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
833 /* restart timer */
834 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
835 timer->hw.start(timer);
836 }
837 } else {
838 timer->hw.stop(timer);
839 }
840
841 /* now process all fast callbacks */
842 while (!list_empty(&timer->ack_list_head)) {
843 p = timer->ack_list_head.next; /* get first item */
844 ti = list_entry(p, struct snd_timer_instance, ack_list);
845
846 /* remove from ack_list and make empty */
847 list_del_init(p);
848
849 ticks = ti->pticks;
850 ti->pticks = 0;
851
852 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
853 spin_unlock(&timer->lock);
854 if (ti->callback)
855 ti->callback(ti, resolution, ticks);
856 spin_lock(&timer->lock);
857 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
858 }
859
860 /* do we have any slow callbacks? */
861 use_tasklet = !list_empty(&timer->sack_list_head);
862 spin_unlock_irqrestore(&timer->lock, flags);
863
864 if (use_tasklet)
865 tasklet_schedule(&timer->task_queue);
866 }
867 EXPORT_SYMBOL(snd_timer_interrupt);
868
869 /*
870
871 */
872
873 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
874 struct snd_timer **rtimer)
875 {
876 struct snd_timer *timer;
877 int err;
878 static struct snd_device_ops ops = {
879 .dev_free = snd_timer_dev_free,
880 .dev_register = snd_timer_dev_register,
881 .dev_disconnect = snd_timer_dev_disconnect,
882 };
883
884 if (snd_BUG_ON(!tid))
885 return -EINVAL;
886 if (rtimer)
887 *rtimer = NULL;
888 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
889 if (!timer)
890 return -ENOMEM;
891 timer->tmr_class = tid->dev_class;
892 timer->card = card;
893 timer->tmr_device = tid->device;
894 timer->tmr_subdevice = tid->subdevice;
895 if (id)
896 strlcpy(timer->id, id, sizeof(timer->id));
897 timer->sticks = 1;
898 INIT_LIST_HEAD(&timer->device_list);
899 INIT_LIST_HEAD(&timer->open_list_head);
900 INIT_LIST_HEAD(&timer->active_list_head);
901 INIT_LIST_HEAD(&timer->ack_list_head);
902 INIT_LIST_HEAD(&timer->sack_list_head);
903 spin_lock_init(&timer->lock);
904 tasklet_init(&timer->task_queue, snd_timer_tasklet,
905 (unsigned long)timer);
906 timer->max_instances = 1000; /* default limit per timer */
907 if (card != NULL) {
908 timer->module = card->module;
909 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
910 if (err < 0) {
911 snd_timer_free(timer);
912 return err;
913 }
914 }
915 if (rtimer)
916 *rtimer = timer;
917 return 0;
918 }
919 EXPORT_SYMBOL(snd_timer_new);
920
921 static int snd_timer_free(struct snd_timer *timer)
922 {
923 if (!timer)
924 return 0;
925
926 mutex_lock(&register_mutex);
927 if (! list_empty(&timer->open_list_head)) {
928 struct list_head *p, *n;
929 struct snd_timer_instance *ti;
930 pr_warn("ALSA: timer %p is busy?\n", timer);
931 list_for_each_safe(p, n, &timer->open_list_head) {
932 list_del_init(p);
933 ti = list_entry(p, struct snd_timer_instance, open_list);
934 ti->timer = NULL;
935 }
936 }
937 list_del(&timer->device_list);
938 mutex_unlock(&register_mutex);
939
940 if (timer->private_free)
941 timer->private_free(timer);
942 kfree(timer);
943 return 0;
944 }
945
946 static int snd_timer_dev_free(struct snd_device *device)
947 {
948 struct snd_timer *timer = device->device_data;
949 return snd_timer_free(timer);
950 }
951
952 static int snd_timer_dev_register(struct snd_device *dev)
953 {
954 struct snd_timer *timer = dev->device_data;
955 struct snd_timer *timer1;
956
957 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
958 return -ENXIO;
959 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
960 !timer->hw.resolution && timer->hw.c_resolution == NULL)
961 return -EINVAL;
962
963 mutex_lock(&register_mutex);
964 list_for_each_entry(timer1, &snd_timer_list, device_list) {
965 if (timer1->tmr_class > timer->tmr_class)
966 break;
967 if (timer1->tmr_class < timer->tmr_class)
968 continue;
969 if (timer1->card && timer->card) {
970 if (timer1->card->number > timer->card->number)
971 break;
972 if (timer1->card->number < timer->card->number)
973 continue;
974 }
975 if (timer1->tmr_device > timer->tmr_device)
976 break;
977 if (timer1->tmr_device < timer->tmr_device)
978 continue;
979 if (timer1->tmr_subdevice > timer->tmr_subdevice)
980 break;
981 if (timer1->tmr_subdevice < timer->tmr_subdevice)
982 continue;
983 /* conflicts.. */
984 mutex_unlock(&register_mutex);
985 return -EBUSY;
986 }
987 list_add_tail(&timer->device_list, &timer1->device_list);
988 mutex_unlock(&register_mutex);
989 return 0;
990 }
991
992 static int snd_timer_dev_disconnect(struct snd_device *device)
993 {
994 struct snd_timer *timer = device->device_data;
995 struct snd_timer_instance *ti;
996
997 mutex_lock(&register_mutex);
998 list_del_init(&timer->device_list);
999 /* wake up pending sleepers */
1000 list_for_each_entry(ti, &timer->open_list_head, open_list) {
1001 if (ti->disconnect)
1002 ti->disconnect(ti);
1003 }
1004 mutex_unlock(&register_mutex);
1005 return 0;
1006 }
1007
1008 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
1009 {
1010 unsigned long flags;
1011 unsigned long resolution = 0;
1012 struct snd_timer_instance *ti, *ts;
1013
1014 if (timer->card && timer->card->shutdown)
1015 return;
1016 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
1017 return;
1018 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
1019 event > SNDRV_TIMER_EVENT_MRESUME))
1020 return;
1021 spin_lock_irqsave(&timer->lock, flags);
1022 if (event == SNDRV_TIMER_EVENT_MSTART ||
1023 event == SNDRV_TIMER_EVENT_MCONTINUE ||
1024 event == SNDRV_TIMER_EVENT_MRESUME)
1025 resolution = snd_timer_hw_resolution(timer);
1026 list_for_each_entry(ti, &timer->active_list_head, active_list) {
1027 if (ti->ccallback)
1028 ti->ccallback(ti, event, tstamp, resolution);
1029 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1030 if (ts->ccallback)
1031 ts->ccallback(ts, event, tstamp, resolution);
1032 }
1033 spin_unlock_irqrestore(&timer->lock, flags);
1034 }
1035 EXPORT_SYMBOL(snd_timer_notify);
1036
1037 /*
1038 * exported functions for global timers
1039 */
1040 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1041 {
1042 struct snd_timer_id tid;
1043
1044 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1045 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1046 tid.card = -1;
1047 tid.device = device;
1048 tid.subdevice = 0;
1049 return snd_timer_new(NULL, id, &tid, rtimer);
1050 }
1051 EXPORT_SYMBOL(snd_timer_global_new);
1052
1053 int snd_timer_global_free(struct snd_timer *timer)
1054 {
1055 return snd_timer_free(timer);
1056 }
1057 EXPORT_SYMBOL(snd_timer_global_free);
1058
1059 int snd_timer_global_register(struct snd_timer *timer)
1060 {
1061 struct snd_device dev;
1062
1063 memset(&dev, 0, sizeof(dev));
1064 dev.device_data = timer;
1065 return snd_timer_dev_register(&dev);
1066 }
1067 EXPORT_SYMBOL(snd_timer_global_register);
1068
1069 /*
1070 * System timer
1071 */
1072
1073 struct snd_timer_system_private {
1074 struct timer_list tlist;
1075 struct snd_timer *snd_timer;
1076 unsigned long last_expires;
1077 unsigned long last_jiffies;
1078 unsigned long correction;
1079 };
1080
1081 static void snd_timer_s_function(struct timer_list *t)
1082 {
1083 struct snd_timer_system_private *priv = from_timer(priv, t,
1084 tlist);
1085 struct snd_timer *timer = priv->snd_timer;
1086 unsigned long jiff = jiffies;
1087 if (time_after(jiff, priv->last_expires))
1088 priv->correction += (long)jiff - (long)priv->last_expires;
1089 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1090 }
1091
1092 static int snd_timer_s_start(struct snd_timer * timer)
1093 {
1094 struct snd_timer_system_private *priv;
1095 unsigned long njiff;
1096
1097 priv = (struct snd_timer_system_private *) timer->private_data;
1098 njiff = (priv->last_jiffies = jiffies);
1099 if (priv->correction > timer->sticks - 1) {
1100 priv->correction -= timer->sticks - 1;
1101 njiff++;
1102 } else {
1103 njiff += timer->sticks - priv->correction;
1104 priv->correction = 0;
1105 }
1106 priv->last_expires = njiff;
1107 mod_timer(&priv->tlist, njiff);
1108 return 0;
1109 }
1110
1111 static int snd_timer_s_stop(struct snd_timer * timer)
1112 {
1113 struct snd_timer_system_private *priv;
1114 unsigned long jiff;
1115
1116 priv = (struct snd_timer_system_private *) timer->private_data;
1117 del_timer(&priv->tlist);
1118 jiff = jiffies;
1119 if (time_before(jiff, priv->last_expires))
1120 timer->sticks = priv->last_expires - jiff;
1121 else
1122 timer->sticks = 1;
1123 priv->correction = 0;
1124 return 0;
1125 }
1126
1127 static int snd_timer_s_close(struct snd_timer *timer)
1128 {
1129 struct snd_timer_system_private *priv;
1130
1131 priv = (struct snd_timer_system_private *)timer->private_data;
1132 del_timer_sync(&priv->tlist);
1133 return 0;
1134 }
1135
1136 static struct snd_timer_hardware snd_timer_system =
1137 {
1138 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1139 .resolution = 1000000000L / HZ,
1140 .ticks = 10000000L,
1141 .close = snd_timer_s_close,
1142 .start = snd_timer_s_start,
1143 .stop = snd_timer_s_stop
1144 };
1145
1146 static void snd_timer_free_system(struct snd_timer *timer)
1147 {
1148 kfree(timer->private_data);
1149 }
1150
1151 static int snd_timer_register_system(void)
1152 {
1153 struct snd_timer *timer;
1154 struct snd_timer_system_private *priv;
1155 int err;
1156
1157 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1158 if (err < 0)
1159 return err;
1160 strcpy(timer->name, "system timer");
1161 timer->hw = snd_timer_system;
1162 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1163 if (priv == NULL) {
1164 snd_timer_free(timer);
1165 return -ENOMEM;
1166 }
1167 priv->snd_timer = timer;
1168 timer_setup(&priv->tlist, snd_timer_s_function, 0);
1169 timer->private_data = priv;
1170 timer->private_free = snd_timer_free_system;
1171 return snd_timer_global_register(timer);
1172 }
1173
1174 #ifdef CONFIG_SND_PROC_FS
1175 /*
1176 * Info interface
1177 */
1178
1179 static void snd_timer_proc_read(struct snd_info_entry *entry,
1180 struct snd_info_buffer *buffer)
1181 {
1182 struct snd_timer *timer;
1183 struct snd_timer_instance *ti;
1184
1185 mutex_lock(&register_mutex);
1186 list_for_each_entry(timer, &snd_timer_list, device_list) {
1187 if (timer->card && timer->card->shutdown)
1188 continue;
1189 switch (timer->tmr_class) {
1190 case SNDRV_TIMER_CLASS_GLOBAL:
1191 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1192 break;
1193 case SNDRV_TIMER_CLASS_CARD:
1194 snd_iprintf(buffer, "C%i-%i: ",
1195 timer->card->number, timer->tmr_device);
1196 break;
1197 case SNDRV_TIMER_CLASS_PCM:
1198 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1199 timer->tmr_device, timer->tmr_subdevice);
1200 break;
1201 default:
1202 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1203 timer->card ? timer->card->number : -1,
1204 timer->tmr_device, timer->tmr_subdevice);
1205 }
1206 snd_iprintf(buffer, "%s :", timer->name);
1207 if (timer->hw.resolution)
1208 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1209 timer->hw.resolution / 1000,
1210 timer->hw.resolution % 1000,
1211 timer->hw.ticks);
1212 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1213 snd_iprintf(buffer, " SLAVE");
1214 snd_iprintf(buffer, "\n");
1215 list_for_each_entry(ti, &timer->open_list_head, open_list)
1216 snd_iprintf(buffer, " Client %s : %s\n",
1217 ti->owner ? ti->owner : "unknown",
1218 ti->flags & (SNDRV_TIMER_IFLG_START |
1219 SNDRV_TIMER_IFLG_RUNNING)
1220 ? "running" : "stopped");
1221 }
1222 mutex_unlock(&register_mutex);
1223 }
1224
1225 static struct snd_info_entry *snd_timer_proc_entry;
1226
1227 static void __init snd_timer_proc_init(void)
1228 {
1229 struct snd_info_entry *entry;
1230
1231 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1232 if (entry != NULL) {
1233 entry->c.text.read = snd_timer_proc_read;
1234 if (snd_info_register(entry) < 0) {
1235 snd_info_free_entry(entry);
1236 entry = NULL;
1237 }
1238 }
1239 snd_timer_proc_entry = entry;
1240 }
1241
1242 static void __exit snd_timer_proc_done(void)
1243 {
1244 snd_info_free_entry(snd_timer_proc_entry);
1245 }
1246 #else /* !CONFIG_SND_PROC_FS */
1247 #define snd_timer_proc_init()
1248 #define snd_timer_proc_done()
1249 #endif
1250
1251 /*
1252 * USER SPACE interface
1253 */
1254
1255 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1256 unsigned long resolution,
1257 unsigned long ticks)
1258 {
1259 struct snd_timer_user *tu = timeri->callback_data;
1260 struct snd_timer_read *r;
1261 int prev;
1262
1263 spin_lock(&tu->qlock);
1264 if (tu->qused > 0) {
1265 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1266 r = &tu->queue[prev];
1267 if (r->resolution == resolution) {
1268 r->ticks += ticks;
1269 goto __wake;
1270 }
1271 }
1272 if (tu->qused >= tu->queue_size) {
1273 tu->overrun++;
1274 } else {
1275 r = &tu->queue[tu->qtail++];
1276 tu->qtail %= tu->queue_size;
1277 r->resolution = resolution;
1278 r->ticks = ticks;
1279 tu->qused++;
1280 }
1281 __wake:
1282 spin_unlock(&tu->qlock);
1283 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1284 wake_up(&tu->qchange_sleep);
1285 }
1286
1287 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1288 struct snd_timer_tread *tread)
1289 {
1290 if (tu->qused >= tu->queue_size) {
1291 tu->overrun++;
1292 } else {
1293 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1294 tu->qtail %= tu->queue_size;
1295 tu->qused++;
1296 }
1297 }
1298
1299 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1300 int event,
1301 struct timespec *tstamp,
1302 unsigned long resolution)
1303 {
1304 struct snd_timer_user *tu = timeri->callback_data;
1305 struct snd_timer_tread r1;
1306 unsigned long flags;
1307
1308 if (event >= SNDRV_TIMER_EVENT_START &&
1309 event <= SNDRV_TIMER_EVENT_PAUSE)
1310 tu->tstamp = *tstamp;
1311 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1312 return;
1313 memset(&r1, 0, sizeof(r1));
1314 r1.event = event;
1315 r1.tstamp = *tstamp;
1316 r1.val = resolution;
1317 spin_lock_irqsave(&tu->qlock, flags);
1318 snd_timer_user_append_to_tqueue(tu, &r1);
1319 spin_unlock_irqrestore(&tu->qlock, flags);
1320 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1321 wake_up(&tu->qchange_sleep);
1322 }
1323
1324 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1325 {
1326 struct snd_timer_user *tu = timeri->callback_data;
1327
1328 tu->disconnected = true;
1329 wake_up(&tu->qchange_sleep);
1330 }
1331
1332 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1333 unsigned long resolution,
1334 unsigned long ticks)
1335 {
1336 struct snd_timer_user *tu = timeri->callback_data;
1337 struct snd_timer_tread *r, r1;
1338 struct timespec tstamp;
1339 int prev, append = 0;
1340
1341 memset(&r1, 0, sizeof(r1));
1342 memset(&tstamp, 0, sizeof(tstamp));
1343 spin_lock(&tu->qlock);
1344 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1345 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1346 spin_unlock(&tu->qlock);
1347 return;
1348 }
1349 if (tu->last_resolution != resolution || ticks > 0) {
1350 if (timer_tstamp_monotonic)
1351 ktime_get_ts(&tstamp);
1352 else
1353 getnstimeofday(&tstamp);
1354 }
1355 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1356 tu->last_resolution != resolution) {
1357 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1358 r1.tstamp = tstamp;
1359 r1.val = resolution;
1360 snd_timer_user_append_to_tqueue(tu, &r1);
1361 tu->last_resolution = resolution;
1362 append++;
1363 }
1364 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1365 goto __wake;
1366 if (ticks == 0)
1367 goto __wake;
1368 if (tu->qused > 0) {
1369 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1370 r = &tu->tqueue[prev];
1371 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1372 r->tstamp = tstamp;
1373 r->val += ticks;
1374 append++;
1375 goto __wake;
1376 }
1377 }
1378 r1.event = SNDRV_TIMER_EVENT_TICK;
1379 r1.tstamp = tstamp;
1380 r1.val = ticks;
1381 snd_timer_user_append_to_tqueue(tu, &r1);
1382 append++;
1383 __wake:
1384 spin_unlock(&tu->qlock);
1385 if (append == 0)
1386 return;
1387 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1388 wake_up(&tu->qchange_sleep);
1389 }
1390
1391 static int realloc_user_queue(struct snd_timer_user *tu, int size)
1392 {
1393 struct snd_timer_read *queue = NULL;
1394 struct snd_timer_tread *tqueue = NULL;
1395
1396 if (tu->tread) {
1397 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1398 if (!tqueue)
1399 return -ENOMEM;
1400 } else {
1401 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1402 if (!queue)
1403 return -ENOMEM;
1404 }
1405
1406 spin_lock_irq(&tu->qlock);
1407 kfree(tu->queue);
1408 kfree(tu->tqueue);
1409 tu->queue_size = size;
1410 tu->queue = queue;
1411 tu->tqueue = tqueue;
1412 tu->qhead = tu->qtail = tu->qused = 0;
1413 spin_unlock_irq(&tu->qlock);
1414
1415 return 0;
1416 }
1417
1418 static int snd_timer_user_open(struct inode *inode, struct file *file)
1419 {
1420 struct snd_timer_user *tu;
1421 int err;
1422
1423 err = nonseekable_open(inode, file);
1424 if (err < 0)
1425 return err;
1426
1427 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1428 if (tu == NULL)
1429 return -ENOMEM;
1430 spin_lock_init(&tu->qlock);
1431 init_waitqueue_head(&tu->qchange_sleep);
1432 mutex_init(&tu->ioctl_lock);
1433 tu->ticks = 1;
1434 if (realloc_user_queue(tu, 128) < 0) {
1435 kfree(tu);
1436 return -ENOMEM;
1437 }
1438 file->private_data = tu;
1439 return 0;
1440 }
1441
1442 static int snd_timer_user_release(struct inode *inode, struct file *file)
1443 {
1444 struct snd_timer_user *tu;
1445
1446 if (file->private_data) {
1447 tu = file->private_data;
1448 file->private_data = NULL;
1449 mutex_lock(&tu->ioctl_lock);
1450 if (tu->timeri)
1451 snd_timer_close(tu->timeri);
1452 mutex_unlock(&tu->ioctl_lock);
1453 kfree(tu->queue);
1454 kfree(tu->tqueue);
1455 kfree(tu);
1456 }
1457 return 0;
1458 }
1459
1460 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1461 {
1462 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1463 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1464 id->card = -1;
1465 id->device = -1;
1466 id->subdevice = -1;
1467 }
1468
1469 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1470 {
1471 id->dev_class = timer->tmr_class;
1472 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1473 id->card = timer->card ? timer->card->number : -1;
1474 id->device = timer->tmr_device;
1475 id->subdevice = timer->tmr_subdevice;
1476 }
1477
1478 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1479 {
1480 struct snd_timer_id id;
1481 struct snd_timer *timer;
1482 struct list_head *p;
1483
1484 if (copy_from_user(&id, _tid, sizeof(id)))
1485 return -EFAULT;
1486 mutex_lock(&register_mutex);
1487 if (id.dev_class < 0) { /* first item */
1488 if (list_empty(&snd_timer_list))
1489 snd_timer_user_zero_id(&id);
1490 else {
1491 timer = list_entry(snd_timer_list.next,
1492 struct snd_timer, device_list);
1493 snd_timer_user_copy_id(&id, timer);
1494 }
1495 } else {
1496 switch (id.dev_class) {
1497 case SNDRV_TIMER_CLASS_GLOBAL:
1498 id.device = id.device < 0 ? 0 : id.device + 1;
1499 list_for_each(p, &snd_timer_list) {
1500 timer = list_entry(p, struct snd_timer, device_list);
1501 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1502 snd_timer_user_copy_id(&id, timer);
1503 break;
1504 }
1505 if (timer->tmr_device >= id.device) {
1506 snd_timer_user_copy_id(&id, timer);
1507 break;
1508 }
1509 }
1510 if (p == &snd_timer_list)
1511 snd_timer_user_zero_id(&id);
1512 break;
1513 case SNDRV_TIMER_CLASS_CARD:
1514 case SNDRV_TIMER_CLASS_PCM:
1515 if (id.card < 0) {
1516 id.card = 0;
1517 } else {
1518 if (id.device < 0) {
1519 id.device = 0;
1520 } else {
1521 if (id.subdevice < 0)
1522 id.subdevice = 0;
1523 else
1524 id.subdevice++;
1525 }
1526 }
1527 list_for_each(p, &snd_timer_list) {
1528 timer = list_entry(p, struct snd_timer, device_list);
1529 if (timer->tmr_class > id.dev_class) {
1530 snd_timer_user_copy_id(&id, timer);
1531 break;
1532 }
1533 if (timer->tmr_class < id.dev_class)
1534 continue;
1535 if (timer->card->number > id.card) {
1536 snd_timer_user_copy_id(&id, timer);
1537 break;
1538 }
1539 if (timer->card->number < id.card)
1540 continue;
1541 if (timer->tmr_device > id.device) {
1542 snd_timer_user_copy_id(&id, timer);
1543 break;
1544 }
1545 if (timer->tmr_device < id.device)
1546 continue;
1547 if (timer->tmr_subdevice > id.subdevice) {
1548 snd_timer_user_copy_id(&id, timer);
1549 break;
1550 }
1551 if (timer->tmr_subdevice < id.subdevice)
1552 continue;
1553 snd_timer_user_copy_id(&id, timer);
1554 break;
1555 }
1556 if (p == &snd_timer_list)
1557 snd_timer_user_zero_id(&id);
1558 break;
1559 default:
1560 snd_timer_user_zero_id(&id);
1561 }
1562 }
1563 mutex_unlock(&register_mutex);
1564 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1565 return -EFAULT;
1566 return 0;
1567 }
1568
1569 static int snd_timer_user_ginfo(struct file *file,
1570 struct snd_timer_ginfo __user *_ginfo)
1571 {
1572 struct snd_timer_ginfo *ginfo;
1573 struct snd_timer_id tid;
1574 struct snd_timer *t;
1575 struct list_head *p;
1576 int err = 0;
1577
1578 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1579 if (IS_ERR(ginfo))
1580 return PTR_ERR(ginfo);
1581
1582 tid = ginfo->tid;
1583 memset(ginfo, 0, sizeof(*ginfo));
1584 ginfo->tid = tid;
1585 mutex_lock(&register_mutex);
1586 t = snd_timer_find(&tid);
1587 if (t != NULL) {
1588 ginfo->card = t->card ? t->card->number : -1;
1589 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1590 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1591 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1592 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1593 ginfo->resolution = t->hw.resolution;
1594 if (t->hw.resolution_min > 0) {
1595 ginfo->resolution_min = t->hw.resolution_min;
1596 ginfo->resolution_max = t->hw.resolution_max;
1597 }
1598 list_for_each(p, &t->open_list_head) {
1599 ginfo->clients++;
1600 }
1601 } else {
1602 err = -ENODEV;
1603 }
1604 mutex_unlock(&register_mutex);
1605 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1606 err = -EFAULT;
1607 kfree(ginfo);
1608 return err;
1609 }
1610
1611 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1612 {
1613 struct snd_timer *t;
1614 int err;
1615
1616 mutex_lock(&register_mutex);
1617 t = snd_timer_find(&gparams->tid);
1618 if (!t) {
1619 err = -ENODEV;
1620 goto _error;
1621 }
1622 if (!list_empty(&t->open_list_head)) {
1623 err = -EBUSY;
1624 goto _error;
1625 }
1626 if (!t->hw.set_period) {
1627 err = -ENOSYS;
1628 goto _error;
1629 }
1630 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1631 _error:
1632 mutex_unlock(&register_mutex);
1633 return err;
1634 }
1635
1636 static int snd_timer_user_gparams(struct file *file,
1637 struct snd_timer_gparams __user *_gparams)
1638 {
1639 struct snd_timer_gparams gparams;
1640
1641 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1642 return -EFAULT;
1643 return timer_set_gparams(&gparams);
1644 }
1645
1646 static int snd_timer_user_gstatus(struct file *file,
1647 struct snd_timer_gstatus __user *_gstatus)
1648 {
1649 struct snd_timer_gstatus gstatus;
1650 struct snd_timer_id tid;
1651 struct snd_timer *t;
1652 int err = 0;
1653
1654 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1655 return -EFAULT;
1656 tid = gstatus.tid;
1657 memset(&gstatus, 0, sizeof(gstatus));
1658 gstatus.tid = tid;
1659 mutex_lock(&register_mutex);
1660 t = snd_timer_find(&tid);
1661 if (t != NULL) {
1662 spin_lock_irq(&t->lock);
1663 gstatus.resolution = snd_timer_hw_resolution(t);
1664 if (t->hw.precise_resolution) {
1665 t->hw.precise_resolution(t, &gstatus.resolution_num,
1666 &gstatus.resolution_den);
1667 } else {
1668 gstatus.resolution_num = gstatus.resolution;
1669 gstatus.resolution_den = 1000000000uL;
1670 }
1671 spin_unlock_irq(&t->lock);
1672 } else {
1673 err = -ENODEV;
1674 }
1675 mutex_unlock(&register_mutex);
1676 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1677 err = -EFAULT;
1678 return err;
1679 }
1680
1681 static int snd_timer_user_tselect(struct file *file,
1682 struct snd_timer_select __user *_tselect)
1683 {
1684 struct snd_timer_user *tu;
1685 struct snd_timer_select tselect;
1686 char str[32];
1687 int err = 0;
1688
1689 tu = file->private_data;
1690 if (tu->timeri) {
1691 snd_timer_close(tu->timeri);
1692 tu->timeri = NULL;
1693 }
1694 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1695 err = -EFAULT;
1696 goto __err;
1697 }
1698 sprintf(str, "application %i", current->pid);
1699 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1700 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1701 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1702 if (err < 0)
1703 goto __err;
1704
1705 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1706 tu->timeri->callback = tu->tread
1707 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1708 tu->timeri->ccallback = snd_timer_user_ccallback;
1709 tu->timeri->callback_data = (void *)tu;
1710 tu->timeri->disconnect = snd_timer_user_disconnect;
1711
1712 __err:
1713 return err;
1714 }
1715
1716 static int snd_timer_user_info(struct file *file,
1717 struct snd_timer_info __user *_info)
1718 {
1719 struct snd_timer_user *tu;
1720 struct snd_timer_info *info;
1721 struct snd_timer *t;
1722 int err = 0;
1723
1724 tu = file->private_data;
1725 if (!tu->timeri)
1726 return -EBADFD;
1727 t = tu->timeri->timer;
1728 if (!t)
1729 return -EBADFD;
1730
1731 info = kzalloc(sizeof(*info), GFP_KERNEL);
1732 if (! info)
1733 return -ENOMEM;
1734 info->card = t->card ? t->card->number : -1;
1735 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1736 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1737 strlcpy(info->id, t->id, sizeof(info->id));
1738 strlcpy(info->name, t->name, sizeof(info->name));
1739 info->resolution = t->hw.resolution;
1740 if (copy_to_user(_info, info, sizeof(*_info)))
1741 err = -EFAULT;
1742 kfree(info);
1743 return err;
1744 }
1745
1746 static int snd_timer_user_params(struct file *file,
1747 struct snd_timer_params __user *_params)
1748 {
1749 struct snd_timer_user *tu;
1750 struct snd_timer_params params;
1751 struct snd_timer *t;
1752 int err;
1753
1754 tu = file->private_data;
1755 if (!tu->timeri)
1756 return -EBADFD;
1757 t = tu->timeri->timer;
1758 if (!t)
1759 return -EBADFD;
1760 if (copy_from_user(&params, _params, sizeof(params)))
1761 return -EFAULT;
1762 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1763 u64 resolution;
1764
1765 if (params.ticks < 1) {
1766 err = -EINVAL;
1767 goto _end;
1768 }
1769
1770 /* Don't allow resolution less than 1ms */
1771 resolution = snd_timer_resolution(tu->timeri);
1772 resolution *= params.ticks;
1773 if (resolution < 1000000) {
1774 err = -EINVAL;
1775 goto _end;
1776 }
1777 }
1778 if (params.queue_size > 0 &&
1779 (params.queue_size < 32 || params.queue_size > 1024)) {
1780 err = -EINVAL;
1781 goto _end;
1782 }
1783 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1784 (1<<SNDRV_TIMER_EVENT_TICK)|
1785 (1<<SNDRV_TIMER_EVENT_START)|
1786 (1<<SNDRV_TIMER_EVENT_STOP)|
1787 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1788 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1789 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1790 (1<<SNDRV_TIMER_EVENT_RESUME)|
1791 (1<<SNDRV_TIMER_EVENT_MSTART)|
1792 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1793 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1794 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1795 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1796 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1797 err = -EINVAL;
1798 goto _end;
1799 }
1800 snd_timer_stop(tu->timeri);
1801 spin_lock_irq(&t->lock);
1802 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1803 SNDRV_TIMER_IFLG_EXCLUSIVE|
1804 SNDRV_TIMER_IFLG_EARLY_EVENT);
1805 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1806 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1807 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1808 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1809 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1810 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1811 spin_unlock_irq(&t->lock);
1812 if (params.queue_size > 0 &&
1813 (unsigned int)tu->queue_size != params.queue_size) {
1814 err = realloc_user_queue(tu, params.queue_size);
1815 if (err < 0)
1816 goto _end;
1817 }
1818 spin_lock_irq(&tu->qlock);
1819 tu->qhead = tu->qtail = tu->qused = 0;
1820 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1821 if (tu->tread) {
1822 struct snd_timer_tread tread;
1823 memset(&tread, 0, sizeof(tread));
1824 tread.event = SNDRV_TIMER_EVENT_EARLY;
1825 tread.tstamp.tv_sec = 0;
1826 tread.tstamp.tv_nsec = 0;
1827 tread.val = 0;
1828 snd_timer_user_append_to_tqueue(tu, &tread);
1829 } else {
1830 struct snd_timer_read *r = &tu->queue[0];
1831 r->resolution = 0;
1832 r->ticks = 0;
1833 tu->qused++;
1834 tu->qtail++;
1835 }
1836 }
1837 tu->filter = params.filter;
1838 tu->ticks = params.ticks;
1839 spin_unlock_irq(&tu->qlock);
1840 err = 0;
1841 _end:
1842 if (copy_to_user(_params, &params, sizeof(params)))
1843 return -EFAULT;
1844 return err;
1845 }
1846
1847 static int snd_timer_user_status(struct file *file,
1848 struct snd_timer_status __user *_status)
1849 {
1850 struct snd_timer_user *tu;
1851 struct snd_timer_status status;
1852
1853 tu = file->private_data;
1854 if (!tu->timeri)
1855 return -EBADFD;
1856 memset(&status, 0, sizeof(status));
1857 status.tstamp = tu->tstamp;
1858 status.resolution = snd_timer_resolution(tu->timeri);
1859 status.lost = tu->timeri->lost;
1860 status.overrun = tu->overrun;
1861 spin_lock_irq(&tu->qlock);
1862 status.queue = tu->qused;
1863 spin_unlock_irq(&tu->qlock);
1864 if (copy_to_user(_status, &status, sizeof(status)))
1865 return -EFAULT;
1866 return 0;
1867 }
1868
1869 static int snd_timer_user_start(struct file *file)
1870 {
1871 int err;
1872 struct snd_timer_user *tu;
1873
1874 tu = file->private_data;
1875 if (!tu->timeri)
1876 return -EBADFD;
1877 snd_timer_stop(tu->timeri);
1878 tu->timeri->lost = 0;
1879 tu->last_resolution = 0;
1880 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1881 }
1882
1883 static int snd_timer_user_stop(struct file *file)
1884 {
1885 int err;
1886 struct snd_timer_user *tu;
1887
1888 tu = file->private_data;
1889 if (!tu->timeri)
1890 return -EBADFD;
1891 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1892 }
1893
1894 static int snd_timer_user_continue(struct file *file)
1895 {
1896 int err;
1897 struct snd_timer_user *tu;
1898
1899 tu = file->private_data;
1900 if (!tu->timeri)
1901 return -EBADFD;
1902 /* start timer instead of continue if it's not used before */
1903 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1904 return snd_timer_user_start(file);
1905 tu->timeri->lost = 0;
1906 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1907 }
1908
1909 static int snd_timer_user_pause(struct file *file)
1910 {
1911 int err;
1912 struct snd_timer_user *tu;
1913
1914 tu = file->private_data;
1915 if (!tu->timeri)
1916 return -EBADFD;
1917 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1918 }
1919
1920 enum {
1921 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1922 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1923 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1924 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1925 };
1926
1927 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1928 unsigned long arg)
1929 {
1930 struct snd_timer_user *tu;
1931 void __user *argp = (void __user *)arg;
1932 int __user *p = argp;
1933
1934 tu = file->private_data;
1935 switch (cmd) {
1936 case SNDRV_TIMER_IOCTL_PVERSION:
1937 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1938 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1939 return snd_timer_user_next_device(argp);
1940 case SNDRV_TIMER_IOCTL_TREAD:
1941 {
1942 int xarg, old_tread;
1943
1944 if (tu->timeri) /* too late */
1945 return -EBUSY;
1946 if (get_user(xarg, p))
1947 return -EFAULT;
1948 old_tread = tu->tread;
1949 tu->tread = xarg ? 1 : 0;
1950 if (tu->tread != old_tread &&
1951 realloc_user_queue(tu, tu->queue_size) < 0) {
1952 tu->tread = old_tread;
1953 return -ENOMEM;
1954 }
1955 return 0;
1956 }
1957 case SNDRV_TIMER_IOCTL_GINFO:
1958 return snd_timer_user_ginfo(file, argp);
1959 case SNDRV_TIMER_IOCTL_GPARAMS:
1960 return snd_timer_user_gparams(file, argp);
1961 case SNDRV_TIMER_IOCTL_GSTATUS:
1962 return snd_timer_user_gstatus(file, argp);
1963 case SNDRV_TIMER_IOCTL_SELECT:
1964 return snd_timer_user_tselect(file, argp);
1965 case SNDRV_TIMER_IOCTL_INFO:
1966 return snd_timer_user_info(file, argp);
1967 case SNDRV_TIMER_IOCTL_PARAMS:
1968 return snd_timer_user_params(file, argp);
1969 case SNDRV_TIMER_IOCTL_STATUS:
1970 return snd_timer_user_status(file, argp);
1971 case SNDRV_TIMER_IOCTL_START:
1972 case SNDRV_TIMER_IOCTL_START_OLD:
1973 return snd_timer_user_start(file);
1974 case SNDRV_TIMER_IOCTL_STOP:
1975 case SNDRV_TIMER_IOCTL_STOP_OLD:
1976 return snd_timer_user_stop(file);
1977 case SNDRV_TIMER_IOCTL_CONTINUE:
1978 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1979 return snd_timer_user_continue(file);
1980 case SNDRV_TIMER_IOCTL_PAUSE:
1981 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1982 return snd_timer_user_pause(file);
1983 }
1984 return -ENOTTY;
1985 }
1986
1987 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1988 unsigned long arg)
1989 {
1990 struct snd_timer_user *tu = file->private_data;
1991 long ret;
1992
1993 mutex_lock(&tu->ioctl_lock);
1994 ret = __snd_timer_user_ioctl(file, cmd, arg);
1995 mutex_unlock(&tu->ioctl_lock);
1996 return ret;
1997 }
1998
1999 static int snd_timer_user_fasync(int fd, struct file * file, int on)
2000 {
2001 struct snd_timer_user *tu;
2002
2003 tu = file->private_data;
2004 return fasync_helper(fd, file, on, &tu->fasync);
2005 }
2006
2007 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
2008 size_t count, loff_t *offset)
2009 {
2010 struct snd_timer_user *tu;
2011 long result = 0, unit;
2012 int qhead;
2013 int err = 0;
2014
2015 tu = file->private_data;
2016 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
2017 mutex_lock(&tu->ioctl_lock);
2018 spin_lock_irq(&tu->qlock);
2019 while ((long)count - result >= unit) {
2020 while (!tu->qused) {
2021 wait_queue_entry_t wait;
2022
2023 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
2024 err = -EAGAIN;
2025 goto _error;
2026 }
2027
2028 set_current_state(TASK_INTERRUPTIBLE);
2029 init_waitqueue_entry(&wait, current);
2030 add_wait_queue(&tu->qchange_sleep, &wait);
2031
2032 spin_unlock_irq(&tu->qlock);
2033 mutex_unlock(&tu->ioctl_lock);
2034 schedule();
2035 mutex_lock(&tu->ioctl_lock);
2036 spin_lock_irq(&tu->qlock);
2037
2038 remove_wait_queue(&tu->qchange_sleep, &wait);
2039
2040 if (tu->disconnected) {
2041 err = -ENODEV;
2042 goto _error;
2043 }
2044 if (signal_pending(current)) {
2045 err = -ERESTARTSYS;
2046 goto _error;
2047 }
2048 }
2049
2050 qhead = tu->qhead++;
2051 tu->qhead %= tu->queue_size;
2052 tu->qused--;
2053 spin_unlock_irq(&tu->qlock);
2054
2055 if (tu->tread) {
2056 if (copy_to_user(buffer, &tu->tqueue[qhead],
2057 sizeof(struct snd_timer_tread)))
2058 err = -EFAULT;
2059 } else {
2060 if (copy_to_user(buffer, &tu->queue[qhead],
2061 sizeof(struct snd_timer_read)))
2062 err = -EFAULT;
2063 }
2064
2065 spin_lock_irq(&tu->qlock);
2066 if (err < 0)
2067 goto _error;
2068 result += unit;
2069 buffer += unit;
2070 }
2071 _error:
2072 spin_unlock_irq(&tu->qlock);
2073 mutex_unlock(&tu->ioctl_lock);
2074 return result > 0 ? result : err;
2075 }
2076
2077 static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait)
2078 {
2079 __poll_t mask;
2080 struct snd_timer_user *tu;
2081
2082 tu = file->private_data;
2083
2084 poll_wait(file, &tu->qchange_sleep, wait);
2085
2086 mask = 0;
2087 spin_lock_irq(&tu->qlock);
2088 if (tu->qused)
2089 mask |= EPOLLIN | EPOLLRDNORM;
2090 if (tu->disconnected)
2091 mask |= EPOLLERR;
2092 spin_unlock_irq(&tu->qlock);
2093
2094 return mask;
2095 }
2096
2097 #ifdef CONFIG_COMPAT
2098 #include "timer_compat.c"
2099 #else
2100 #define snd_timer_user_ioctl_compat NULL
2101 #endif
2102
2103 static const struct file_operations snd_timer_f_ops =
2104 {
2105 .owner = THIS_MODULE,
2106 .read = snd_timer_user_read,
2107 .open = snd_timer_user_open,
2108 .release = snd_timer_user_release,
2109 .llseek = no_llseek,
2110 .poll = snd_timer_user_poll,
2111 .unlocked_ioctl = snd_timer_user_ioctl,
2112 .compat_ioctl = snd_timer_user_ioctl_compat,
2113 .fasync = snd_timer_user_fasync,
2114 };
2115
2116 /* unregister the system timer */
2117 static void snd_timer_free_all(void)
2118 {
2119 struct snd_timer *timer, *n;
2120
2121 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2122 snd_timer_free(timer);
2123 }
2124
2125 static struct device timer_dev;
2126
2127 /*
2128 * ENTRY functions
2129 */
2130
2131 static int __init alsa_timer_init(void)
2132 {
2133 int err;
2134
2135 snd_device_initialize(&timer_dev, NULL);
2136 dev_set_name(&timer_dev, "timer");
2137
2138 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2139 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2140 "system timer");
2141 #endif
2142
2143 err = snd_timer_register_system();
2144 if (err < 0) {
2145 pr_err("ALSA: unable to register system timer (%i)\n", err);
2146 goto put_timer;
2147 }
2148
2149 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2150 &snd_timer_f_ops, NULL, &timer_dev);
2151 if (err < 0) {
2152 pr_err("ALSA: unable to register timer device (%i)\n", err);
2153 snd_timer_free_all();
2154 goto put_timer;
2155 }
2156
2157 snd_timer_proc_init();
2158 return 0;
2159
2160 put_timer:
2161 put_device(&timer_dev);
2162 return err;
2163 }
2164
2165 static void __exit alsa_timer_exit(void)
2166 {
2167 snd_unregister_device(&timer_dev);
2168 snd_timer_free_all();
2169 put_device(&timer_dev);
2170 snd_timer_proc_done();
2171 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2172 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2173 #endif
2174 }
2175
2176 module_init(alsa_timer_init)
2177 module_exit(alsa_timer_exit)
Linux with added FPC-III support