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