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