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