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rapidio/rionet: fix deadlock on SMP
[linux/fpc-iii.git] / sound / core / timer.c
blob442e279689252de4922a43fed412763f37bd2b36
1 /*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <linux/device.h>
28 #include <linux/module.h>
29 #include <linux/string.h>
30 #include <sound/core.h>
31 #include <sound/timer.h>
32 #include <sound/control.h>
33 #include <sound/info.h>
34 #include <sound/minors.h>
35 #include <sound/initval.h>
36 #include <linux/kmod.h>
37
38 #if IS_ENABLED(CONFIG_SND_HRTIMER)
39 #define DEFAULT_TIMER_LIMIT 4
40 #elif IS_ENABLED(CONFIG_SND_RTCTIMER)
41 #define DEFAULT_TIMER_LIMIT 2
42 #else
43 #define DEFAULT_TIMER_LIMIT 1
44 #endif
45
46 static int timer_limit = DEFAULT_TIMER_LIMIT;
47 static int timer_tstamp_monotonic = 1;
48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
49 MODULE_DESCRIPTION("ALSA timer interface");
50 MODULE_LICENSE("GPL");
51 module_param(timer_limit, int, 0444);
52 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
53 module_param(timer_tstamp_monotonic, int, 0444);
54 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
55
56 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
57 MODULE_ALIAS("devname:snd/timer");
58
59 struct snd_timer_user {
60 struct snd_timer_instance *timeri;
61 int tread; /* enhanced read with timestamps and events */
62 unsigned long ticks;
63 unsigned long overrun;
64 int qhead;
65 int qtail;
66 int qused;
67 int queue_size;
68 bool disconnected;
69 struct snd_timer_read *queue;
70 struct snd_timer_tread *tqueue;
71 spinlock_t qlock;
72 unsigned long last_resolution;
73 unsigned int filter;
74 struct timespec tstamp; /* trigger tstamp */
75 wait_queue_head_t qchange_sleep;
76 struct fasync_struct *fasync;
77 struct mutex ioctl_lock;
78 };
79
80 /* list of timers */
81 static LIST_HEAD(snd_timer_list);
82
83 /* list of slave instances */
84 static LIST_HEAD(snd_timer_slave_list);
85
86 /* lock for slave active lists */
87 static DEFINE_SPINLOCK(slave_active_lock);
88
89 static DEFINE_MUTEX(register_mutex);
90
91 static int snd_timer_free(struct snd_timer *timer);
92 static int snd_timer_dev_free(struct snd_device *device);
93 static int snd_timer_dev_register(struct snd_device *device);
94 static int snd_timer_dev_disconnect(struct snd_device *device);
95
96 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
97
98 /*
99 * create a timer instance with the given owner string.
100 * when timer is not NULL, increments the module counter
101 */
102 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
103 struct snd_timer *timer)
104 {
105 struct snd_timer_instance *timeri;
106 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
107 if (timeri == NULL)
108 return NULL;
109 timeri->owner = kstrdup(owner, GFP_KERNEL);
110 if (! timeri->owner) {
111 kfree(timeri);
112 return NULL;
113 }
114 INIT_LIST_HEAD(&timeri->open_list);
115 INIT_LIST_HEAD(&timeri->active_list);
116 INIT_LIST_HEAD(&timeri->ack_list);
117 INIT_LIST_HEAD(&timeri->slave_list_head);
118 INIT_LIST_HEAD(&timeri->slave_active_head);
119
120 timeri->timer = timer;
121 if (timer && !try_module_get(timer->module)) {
122 kfree(timeri->owner);
123 kfree(timeri);
124 return NULL;
125 }
126
127 return timeri;
128 }
129
130 /*
131 * find a timer instance from the given timer id
132 */
133 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
134 {
135 struct snd_timer *timer = NULL;
136
137 list_for_each_entry(timer, &snd_timer_list, device_list) {
138 if (timer->tmr_class != tid->dev_class)
139 continue;
140 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
141 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
142 (timer->card == NULL ||
143 timer->card->number != tid->card))
144 continue;
145 if (timer->tmr_device != tid->device)
146 continue;
147 if (timer->tmr_subdevice != tid->subdevice)
148 continue;
149 return timer;
150 }
151 return NULL;
152 }
153
154 #ifdef CONFIG_MODULES
155
156 static void snd_timer_request(struct snd_timer_id *tid)
157 {
158 switch (tid->dev_class) {
159 case SNDRV_TIMER_CLASS_GLOBAL:
160 if (tid->device < timer_limit)
161 request_module("snd-timer-%i", tid->device);
162 break;
163 case SNDRV_TIMER_CLASS_CARD:
164 case SNDRV_TIMER_CLASS_PCM:
165 if (tid->card < snd_ecards_limit)
166 request_module("snd-card-%i", tid->card);
167 break;
168 default:
169 break;
170 }
171 }
172
173 #endif
174
175 /*
176 * look for a master instance matching with the slave id of the given slave.
177 * when found, relink the open_link of the slave.
178 *
179 * call this with register_mutex down.
180 */
181 static void snd_timer_check_slave(struct snd_timer_instance *slave)
182 {
183 struct snd_timer *timer;
184 struct snd_timer_instance *master;
185
186 /* FIXME: it's really dumb to look up all entries.. */
187 list_for_each_entry(timer, &snd_timer_list, device_list) {
188 list_for_each_entry(master, &timer->open_list_head, open_list) {
189 if (slave->slave_class == master->slave_class &&
190 slave->slave_id == master->slave_id) {
191 list_move_tail(&slave->open_list,
192 &master->slave_list_head);
193 spin_lock_irq(&slave_active_lock);
194 slave->master = master;
195 slave->timer = master->timer;
196 spin_unlock_irq(&slave_active_lock);
197 return;
198 }
199 }
200 }
201 }
202
203 /*
204 * look for slave instances matching with the slave id of the given master.
205 * when found, relink the open_link of slaves.
206 *
207 * call this with register_mutex down.
208 */
209 static void snd_timer_check_master(struct snd_timer_instance *master)
210 {
211 struct snd_timer_instance *slave, *tmp;
212
213 /* check all pending slaves */
214 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
215 if (slave->slave_class == master->slave_class &&
216 slave->slave_id == master->slave_id) {
217 list_move_tail(&slave->open_list, &master->slave_list_head);
218 spin_lock_irq(&slave_active_lock);
219 spin_lock(&master->timer->lock);
220 slave->master = master;
221 slave->timer = master->timer;
222 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
223 list_add_tail(&slave->active_list,
224 &master->slave_active_head);
225 spin_unlock(&master->timer->lock);
226 spin_unlock_irq(&slave_active_lock);
227 }
228 }
229 }
230
231 /*
232 * open a timer instance
233 * when opening a master, the slave id must be here given.
234 */
235 int snd_timer_open(struct snd_timer_instance **ti,
236 char *owner, struct snd_timer_id *tid,
237 unsigned int slave_id)
238 {
239 struct snd_timer *timer;
240 struct snd_timer_instance *timeri = NULL;
241
242 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
243 /* open a slave instance */
244 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
245 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
246 pr_debug("ALSA: timer: invalid slave class %i\n",
247 tid->dev_sclass);
248 return -EINVAL;
249 }
250 mutex_lock(&register_mutex);
251 timeri = snd_timer_instance_new(owner, NULL);
252 if (!timeri) {
253 mutex_unlock(&register_mutex);
254 return -ENOMEM;
255 }
256 timeri->slave_class = tid->dev_sclass;
257 timeri->slave_id = tid->device;
258 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
259 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
260 snd_timer_check_slave(timeri);
261 mutex_unlock(&register_mutex);
262 *ti = timeri;
263 return 0;
264 }
265
266 /* open a master instance */
267 mutex_lock(&register_mutex);
268 timer = snd_timer_find(tid);
269 #ifdef CONFIG_MODULES
270 if (!timer) {
271 mutex_unlock(&register_mutex);
272 snd_timer_request(tid);
273 mutex_lock(&register_mutex);
274 timer = snd_timer_find(tid);
275 }
276 #endif
277 if (!timer) {
278 mutex_unlock(&register_mutex);
279 return -ENODEV;
280 }
281 if (!list_empty(&timer->open_list_head)) {
282 timeri = list_entry(timer->open_list_head.next,
283 struct snd_timer_instance, open_list);
284 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
285 mutex_unlock(&register_mutex);
286 return -EBUSY;
287 }
288 }
289 timeri = snd_timer_instance_new(owner, timer);
290 if (!timeri) {
291 mutex_unlock(&register_mutex);
292 return -ENOMEM;
293 }
294 /* take a card refcount for safe disconnection */
295 if (timer->card)
296 get_device(&timer->card->card_dev);
297 timeri->slave_class = tid->dev_sclass;
298 timeri->slave_id = slave_id;
299 if (list_empty(&timer->open_list_head) && timer->hw.open)
300 timer->hw.open(timer);
301 list_add_tail(&timeri->open_list, &timer->open_list_head);
302 snd_timer_check_master(timeri);
303 mutex_unlock(&register_mutex);
304 *ti = timeri;
305 return 0;
306 }
307
308 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event);
309
310 /*
311 * close a timer instance
312 */
313 int snd_timer_close(struct snd_timer_instance *timeri)
314 {
315 struct snd_timer *timer = NULL;
316 struct snd_timer_instance *slave, *tmp;
317
318 if (snd_BUG_ON(!timeri))
319 return -ENXIO;
320
321 /* force to stop the timer */
322 snd_timer_stop(timeri);
323
324 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
325 /* wait, until the active callback is finished */
326 spin_lock_irq(&slave_active_lock);
327 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
328 spin_unlock_irq(&slave_active_lock);
329 udelay(10);
330 spin_lock_irq(&slave_active_lock);
331 }
332 spin_unlock_irq(&slave_active_lock);
333 mutex_lock(&register_mutex);
334 list_del(&timeri->open_list);
335 mutex_unlock(&register_mutex);
336 } else {
337 timer = timeri->timer;
338 if (snd_BUG_ON(!timer))
339 goto out;
340 /* wait, until the active callback is finished */
341 spin_lock_irq(&timer->lock);
342 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
343 spin_unlock_irq(&timer->lock);
344 udelay(10);
345 spin_lock_irq(&timer->lock);
346 }
347 spin_unlock_irq(&timer->lock);
348 mutex_lock(&register_mutex);
349 list_del(&timeri->open_list);
350 if (list_empty(&timer->open_list_head) &&
351 timer->hw.close)
352 timer->hw.close(timer);
353 /* remove slave links */
354 spin_lock_irq(&slave_active_lock);
355 spin_lock(&timer->lock);
356 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
357 open_list) {
358 list_move_tail(&slave->open_list, &snd_timer_slave_list);
359 slave->master = NULL;
360 slave->timer = NULL;
361 list_del_init(&slave->ack_list);
362 list_del_init(&slave->active_list);
363 }
364 spin_unlock(&timer->lock);
365 spin_unlock_irq(&slave_active_lock);
366 /* release a card refcount for safe disconnection */
367 if (timer->card)
368 put_device(&timer->card->card_dev);
369 mutex_unlock(&register_mutex);
370 }
371 out:
372 if (timeri->private_free)
373 timeri->private_free(timeri);
374 kfree(timeri->owner);
375 kfree(timeri);
376 if (timer)
377 module_put(timer->module);
378 return 0;
379 }
380
381 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
382 {
383 struct snd_timer * timer;
384
385 if (timeri == NULL)
386 return 0;
387 if ((timer = timeri->timer) != NULL) {
388 if (timer->hw.c_resolution)
389 return timer->hw.c_resolution(timer);
390 return timer->hw.resolution;
391 }
392 return 0;
393 }
394
395 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
396 {
397 struct snd_timer *timer;
398 unsigned long flags;
399 unsigned long resolution = 0;
400 struct snd_timer_instance *ts;
401 struct timespec tstamp;
402
403 if (timer_tstamp_monotonic)
404 ktime_get_ts(&tstamp);
405 else
406 getnstimeofday(&tstamp);
407 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
408 event > SNDRV_TIMER_EVENT_PAUSE))
409 return;
410 if (event == SNDRV_TIMER_EVENT_START ||
411 event == SNDRV_TIMER_EVENT_CONTINUE)
412 resolution = snd_timer_resolution(ti);
413 if (ti->ccallback)
414 ti->ccallback(ti, event, &tstamp, resolution);
415 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
416 return;
417 timer = ti->timer;
418 if (timer == NULL)
419 return;
420 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
421 return;
422 spin_lock_irqsave(&timer->lock, flags);
423 list_for_each_entry(ts, &ti->slave_active_head, active_list)
424 if (ts->ccallback)
425 ts->ccallback(ts, event + 100, &tstamp, resolution);
426 spin_unlock_irqrestore(&timer->lock, flags);
427 }
428
429 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
430 unsigned long sticks)
431 {
432 list_move_tail(&timeri->active_list, &timer->active_list_head);
433 if (timer->running) {
434 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
435 goto __start_now;
436 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
437 timeri->flags |= SNDRV_TIMER_IFLG_START;
438 return 1; /* delayed start */
439 } else {
440 timer->sticks = sticks;
441 timer->hw.start(timer);
442 __start_now:
443 timer->running++;
444 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
445 return 0;
446 }
447 }
448
449 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
450 {
451 unsigned long flags;
452
453 spin_lock_irqsave(&slave_active_lock, flags);
454 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
455 spin_unlock_irqrestore(&slave_active_lock, flags);
456 return -EBUSY;
457 }
458 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
459 if (timeri->master && timeri->timer) {
460 spin_lock(&timeri->timer->lock);
461 list_add_tail(&timeri->active_list,
462 &timeri->master->slave_active_head);
463 spin_unlock(&timeri->timer->lock);
464 }
465 spin_unlock_irqrestore(&slave_active_lock, flags);
466 return 1; /* delayed start */
467 }
468
469 /*
470 * start the timer instance
471 */
472 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
473 {
474 struct snd_timer *timer;
475 int result = -EINVAL;
476 unsigned long flags;
477
478 if (timeri == NULL || ticks < 1)
479 return -EINVAL;
480 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
481 result = snd_timer_start_slave(timeri);
482 if (result >= 0)
483 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
484 return result;
485 }
486 timer = timeri->timer;
487 if (timer == NULL)
488 return -EINVAL;
489 if (timer->card && timer->card->shutdown)
490 return -ENODEV;
491 spin_lock_irqsave(&timer->lock, flags);
492 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
493 SNDRV_TIMER_IFLG_START)) {
494 result = -EBUSY;
495 goto unlock;
496 }
497 timeri->ticks = timeri->cticks = ticks;
498 timeri->pticks = 0;
499 result = snd_timer_start1(timer, timeri, ticks);
500 unlock:
501 spin_unlock_irqrestore(&timer->lock, flags);
502 if (result >= 0)
503 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
504 return result;
505 }
506
507 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event)
508 {
509 struct snd_timer *timer;
510 unsigned long flags;
511
512 if (snd_BUG_ON(!timeri))
513 return -ENXIO;
514
515 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
516 spin_lock_irqsave(&slave_active_lock, flags);
517 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
518 spin_unlock_irqrestore(&slave_active_lock, flags);
519 return -EBUSY;
520 }
521 if (timeri->timer)
522 spin_lock(&timeri->timer->lock);
523 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
524 list_del_init(&timeri->ack_list);
525 list_del_init(&timeri->active_list);
526 if (timeri->timer)
527 spin_unlock(&timeri->timer->lock);
528 spin_unlock_irqrestore(&slave_active_lock, flags);
529 goto __end;
530 }
531 timer = timeri->timer;
532 if (!timer)
533 return -EINVAL;
534 spin_lock_irqsave(&timer->lock, flags);
535 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
536 SNDRV_TIMER_IFLG_START))) {
537 spin_unlock_irqrestore(&timer->lock, flags);
538 return -EBUSY;
539 }
540 list_del_init(&timeri->ack_list);
541 list_del_init(&timeri->active_list);
542 if (timer->card && timer->card->shutdown) {
543 spin_unlock_irqrestore(&timer->lock, flags);
544 return 0;
545 }
546 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
547 !(--timer->running)) {
548 timer->hw.stop(timer);
549 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
550 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
551 snd_timer_reschedule(timer, 0);
552 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
553 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
554 timer->hw.start(timer);
555 }
556 }
557 }
558 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
559 spin_unlock_irqrestore(&timer->lock, flags);
560 __end:
561 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
562 snd_timer_notify1(timeri, event);
563 return 0;
564 }
565
566 /*
567 * stop the timer instance.
568 *
569 * do not call this from the timer callback!
570 */
571 int snd_timer_stop(struct snd_timer_instance *timeri)
572 {
573 struct snd_timer *timer;
574 unsigned long flags;
575 int err;
576
577 err = _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_STOP);
578 if (err < 0)
579 return err;
580 timer = timeri->timer;
581 if (!timer)
582 return -EINVAL;
583 spin_lock_irqsave(&timer->lock, flags);
584 timeri->cticks = timeri->ticks;
585 timeri->pticks = 0;
586 spin_unlock_irqrestore(&timer->lock, flags);
587 return 0;
588 }
589
590 /*
591 * start again.. the tick is kept.
592 */
593 int snd_timer_continue(struct snd_timer_instance *timeri)
594 {
595 struct snd_timer *timer;
596 int result = -EINVAL;
597 unsigned long flags;
598
599 if (timeri == NULL)
600 return result;
601 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
602 return snd_timer_start_slave(timeri);
603 timer = timeri->timer;
604 if (! timer)
605 return -EINVAL;
606 if (timer->card && timer->card->shutdown)
607 return -ENODEV;
608 spin_lock_irqsave(&timer->lock, flags);
609 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
610 result = -EBUSY;
611 goto unlock;
612 }
613 if (!timeri->cticks)
614 timeri->cticks = 1;
615 timeri->pticks = 0;
616 result = snd_timer_start1(timer, timeri, timer->sticks);
617 unlock:
618 spin_unlock_irqrestore(&timer->lock, flags);
619 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
620 return result;
621 }
622
623 /*
624 * pause.. remember the ticks left
625 */
626 int snd_timer_pause(struct snd_timer_instance * timeri)
627 {
628 return _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_PAUSE);
629 }
630
631 /*
632 * reschedule the timer
633 *
634 * start pending instances and check the scheduling ticks.
635 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
636 */
637 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
638 {
639 struct snd_timer_instance *ti;
640 unsigned long ticks = ~0UL;
641
642 list_for_each_entry(ti, &timer->active_list_head, active_list) {
643 if (ti->flags & SNDRV_TIMER_IFLG_START) {
644 ti->flags &= ~SNDRV_TIMER_IFLG_START;
645 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
646 timer->running++;
647 }
648 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
649 if (ticks > ti->cticks)
650 ticks = ti->cticks;
651 }
652 }
653 if (ticks == ~0UL) {
654 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
655 return;
656 }
657 if (ticks > timer->hw.ticks)
658 ticks = timer->hw.ticks;
659 if (ticks_left != ticks)
660 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
661 timer->sticks = ticks;
662 }
663
664 /*
665 * timer tasklet
666 *
667 */
668 static void snd_timer_tasklet(unsigned long arg)
669 {
670 struct snd_timer *timer = (struct snd_timer *) arg;
671 struct snd_timer_instance *ti;
672 struct list_head *p;
673 unsigned long resolution, ticks;
674 unsigned long flags;
675
676 if (timer->card && timer->card->shutdown)
677 return;
678
679 spin_lock_irqsave(&timer->lock, flags);
680 /* now process all callbacks */
681 while (!list_empty(&timer->sack_list_head)) {
682 p = timer->sack_list_head.next; /* get first item */
683 ti = list_entry(p, struct snd_timer_instance, ack_list);
684
685 /* remove from ack_list and make empty */
686 list_del_init(p);
687
688 ticks = ti->pticks;
689 ti->pticks = 0;
690 resolution = ti->resolution;
691
692 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
693 spin_unlock(&timer->lock);
694 if (ti->callback)
695 ti->callback(ti, resolution, ticks);
696 spin_lock(&timer->lock);
697 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
698 }
699 spin_unlock_irqrestore(&timer->lock, flags);
700 }
701
702 /*
703 * timer interrupt
704 *
705 * ticks_left is usually equal to timer->sticks.
706 *
707 */
708 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
709 {
710 struct snd_timer_instance *ti, *ts, *tmp;
711 unsigned long resolution, ticks;
712 struct list_head *p, *ack_list_head;
713 unsigned long flags;
714 int use_tasklet = 0;
715
716 if (timer == NULL)
717 return;
718
719 if (timer->card && timer->card->shutdown)
720 return;
721
722 spin_lock_irqsave(&timer->lock, flags);
723
724 /* remember the current resolution */
725 if (timer->hw.c_resolution)
726 resolution = timer->hw.c_resolution(timer);
727 else
728 resolution = timer->hw.resolution;
729
730 /* loop for all active instances
731 * Here we cannot use list_for_each_entry because the active_list of a
732 * processed instance is relinked to done_list_head before the callback
733 * is called.
734 */
735 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
736 active_list) {
737 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
738 continue;
739 ti->pticks += ticks_left;
740 ti->resolution = resolution;
741 if (ti->cticks < ticks_left)
742 ti->cticks = 0;
743 else
744 ti->cticks -= ticks_left;
745 if (ti->cticks) /* not expired */
746 continue;
747 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
748 ti->cticks = ti->ticks;
749 } else {
750 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
751 --timer->running;
752 list_del_init(&ti->active_list);
753 }
754 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
755 (ti->flags & SNDRV_TIMER_IFLG_FAST))
756 ack_list_head = &timer->ack_list_head;
757 else
758 ack_list_head = &timer->sack_list_head;
759 if (list_empty(&ti->ack_list))
760 list_add_tail(&ti->ack_list, ack_list_head);
761 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
762 ts->pticks = ti->pticks;
763 ts->resolution = resolution;
764 if (list_empty(&ts->ack_list))
765 list_add_tail(&ts->ack_list, ack_list_head);
766 }
767 }
768 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
769 snd_timer_reschedule(timer, timer->sticks);
770 if (timer->running) {
771 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
772 timer->hw.stop(timer);
773 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
774 }
775 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
776 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
777 /* restart timer */
778 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
779 timer->hw.start(timer);
780 }
781 } else {
782 timer->hw.stop(timer);
783 }
784
785 /* now process all fast callbacks */
786 while (!list_empty(&timer->ack_list_head)) {
787 p = timer->ack_list_head.next; /* get first item */
788 ti = list_entry(p, struct snd_timer_instance, ack_list);
789
790 /* remove from ack_list and make empty */
791 list_del_init(p);
792
793 ticks = ti->pticks;
794 ti->pticks = 0;
795
796 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
797 spin_unlock(&timer->lock);
798 if (ti->callback)
799 ti->callback(ti, resolution, ticks);
800 spin_lock(&timer->lock);
801 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
802 }
803
804 /* do we have any slow callbacks? */
805 use_tasklet = !list_empty(&timer->sack_list_head);
806 spin_unlock_irqrestore(&timer->lock, flags);
807
808 if (use_tasklet)
809 tasklet_schedule(&timer->task_queue);
810 }
811
812 /*
813
814 */
815
816 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
817 struct snd_timer **rtimer)
818 {
819 struct snd_timer *timer;
820 int err;
821 static struct snd_device_ops ops = {
822 .dev_free = snd_timer_dev_free,
823 .dev_register = snd_timer_dev_register,
824 .dev_disconnect = snd_timer_dev_disconnect,
825 };
826
827 if (snd_BUG_ON(!tid))
828 return -EINVAL;
829 if (rtimer)
830 *rtimer = NULL;
831 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
832 if (timer == NULL) {
833 pr_err("ALSA: timer: cannot allocate\n");
834 return -ENOMEM;
835 }
836 timer->tmr_class = tid->dev_class;
837 timer->card = card;
838 timer->tmr_device = tid->device;
839 timer->tmr_subdevice = tid->subdevice;
840 if (id)
841 strlcpy(timer->id, id, sizeof(timer->id));
842 INIT_LIST_HEAD(&timer->device_list);
843 INIT_LIST_HEAD(&timer->open_list_head);
844 INIT_LIST_HEAD(&timer->active_list_head);
845 INIT_LIST_HEAD(&timer->ack_list_head);
846 INIT_LIST_HEAD(&timer->sack_list_head);
847 spin_lock_init(&timer->lock);
848 tasklet_init(&timer->task_queue, snd_timer_tasklet,
849 (unsigned long)timer);
850 if (card != NULL) {
851 timer->module = card->module;
852 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
853 if (err < 0) {
854 snd_timer_free(timer);
855 return err;
856 }
857 }
858 if (rtimer)
859 *rtimer = timer;
860 return 0;
861 }
862
863 static int snd_timer_free(struct snd_timer *timer)
864 {
865 if (!timer)
866 return 0;
867
868 mutex_lock(&register_mutex);
869 if (! list_empty(&timer->open_list_head)) {
870 struct list_head *p, *n;
871 struct snd_timer_instance *ti;
872 pr_warn("ALSA: timer %p is busy?\n", timer);
873 list_for_each_safe(p, n, &timer->open_list_head) {
874 list_del_init(p);
875 ti = list_entry(p, struct snd_timer_instance, open_list);
876 ti->timer = NULL;
877 }
878 }
879 list_del(&timer->device_list);
880 mutex_unlock(&register_mutex);
881
882 if (timer->private_free)
883 timer->private_free(timer);
884 kfree(timer);
885 return 0;
886 }
887
888 static int snd_timer_dev_free(struct snd_device *device)
889 {
890 struct snd_timer *timer = device->device_data;
891 return snd_timer_free(timer);
892 }
893
894 static int snd_timer_dev_register(struct snd_device *dev)
895 {
896 struct snd_timer *timer = dev->device_data;
897 struct snd_timer *timer1;
898
899 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
900 return -ENXIO;
901 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
902 !timer->hw.resolution && timer->hw.c_resolution == NULL)
903 return -EINVAL;
904
905 mutex_lock(&register_mutex);
906 list_for_each_entry(timer1, &snd_timer_list, device_list) {
907 if (timer1->tmr_class > timer->tmr_class)
908 break;
909 if (timer1->tmr_class < timer->tmr_class)
910 continue;
911 if (timer1->card && timer->card) {
912 if (timer1->card->number > timer->card->number)
913 break;
914 if (timer1->card->number < timer->card->number)
915 continue;
916 }
917 if (timer1->tmr_device > timer->tmr_device)
918 break;
919 if (timer1->tmr_device < timer->tmr_device)
920 continue;
921 if (timer1->tmr_subdevice > timer->tmr_subdevice)
922 break;
923 if (timer1->tmr_subdevice < timer->tmr_subdevice)
924 continue;
925 /* conflicts.. */
926 mutex_unlock(&register_mutex);
927 return -EBUSY;
928 }
929 list_add_tail(&timer->device_list, &timer1->device_list);
930 mutex_unlock(&register_mutex);
931 return 0;
932 }
933
934 /* just for reference in snd_timer_dev_disconnect() below */
935 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
936 int event, struct timespec *tstamp,
937 unsigned long resolution);
938
939 static int snd_timer_dev_disconnect(struct snd_device *device)
940 {
941 struct snd_timer *timer = device->device_data;
942 struct snd_timer_instance *ti;
943
944 mutex_lock(&register_mutex);
945 list_del_init(&timer->device_list);
946 /* wake up pending sleepers */
947 list_for_each_entry(ti, &timer->open_list_head, open_list) {
948 /* FIXME: better to have a ti.disconnect() op */
949 if (ti->ccallback == snd_timer_user_ccallback) {
950 struct snd_timer_user *tu = ti->callback_data;
951
952 tu->disconnected = true;
953 wake_up(&tu->qchange_sleep);
954 }
955 }
956 mutex_unlock(&register_mutex);
957 return 0;
958 }
959
960 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
961 {
962 unsigned long flags;
963 unsigned long resolution = 0;
964 struct snd_timer_instance *ti, *ts;
965
966 if (timer->card && timer->card->shutdown)
967 return;
968 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
969 return;
970 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
971 event > SNDRV_TIMER_EVENT_MRESUME))
972 return;
973 spin_lock_irqsave(&timer->lock, flags);
974 if (event == SNDRV_TIMER_EVENT_MSTART ||
975 event == SNDRV_TIMER_EVENT_MCONTINUE ||
976 event == SNDRV_TIMER_EVENT_MRESUME) {
977 if (timer->hw.c_resolution)
978 resolution = timer->hw.c_resolution(timer);
979 else
980 resolution = timer->hw.resolution;
981 }
982 list_for_each_entry(ti, &timer->active_list_head, active_list) {
983 if (ti->ccallback)
984 ti->ccallback(ti, event, tstamp, resolution);
985 list_for_each_entry(ts, &ti->slave_active_head, active_list)
986 if (ts->ccallback)
987 ts->ccallback(ts, event, tstamp, resolution);
988 }
989 spin_unlock_irqrestore(&timer->lock, flags);
990 }
991
992 /*
993 * exported functions for global timers
994 */
995 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
996 {
997 struct snd_timer_id tid;
998
999 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1000 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1001 tid.card = -1;
1002 tid.device = device;
1003 tid.subdevice = 0;
1004 return snd_timer_new(NULL, id, &tid, rtimer);
1005 }
1006
1007 int snd_timer_global_free(struct snd_timer *timer)
1008 {
1009 return snd_timer_free(timer);
1010 }
1011
1012 int snd_timer_global_register(struct snd_timer *timer)
1013 {
1014 struct snd_device dev;
1015
1016 memset(&dev, 0, sizeof(dev));
1017 dev.device_data = timer;
1018 return snd_timer_dev_register(&dev);
1019 }
1020
1021 /*
1022 * System timer
1023 */
1024
1025 struct snd_timer_system_private {
1026 struct timer_list tlist;
1027 unsigned long last_expires;
1028 unsigned long last_jiffies;
1029 unsigned long correction;
1030 };
1031
1032 static void snd_timer_s_function(unsigned long data)
1033 {
1034 struct snd_timer *timer = (struct snd_timer *)data;
1035 struct snd_timer_system_private *priv = timer->private_data;
1036 unsigned long jiff = jiffies;
1037 if (time_after(jiff, priv->last_expires))
1038 priv->correction += (long)jiff - (long)priv->last_expires;
1039 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1040 }
1041
1042 static int snd_timer_s_start(struct snd_timer * timer)
1043 {
1044 struct snd_timer_system_private *priv;
1045 unsigned long njiff;
1046
1047 priv = (struct snd_timer_system_private *) timer->private_data;
1048 njiff = (priv->last_jiffies = jiffies);
1049 if (priv->correction > timer->sticks - 1) {
1050 priv->correction -= timer->sticks - 1;
1051 njiff++;
1052 } else {
1053 njiff += timer->sticks - priv->correction;
1054 priv->correction = 0;
1055 }
1056 priv->last_expires = priv->tlist.expires = njiff;
1057 add_timer(&priv->tlist);
1058 return 0;
1059 }
1060
1061 static int snd_timer_s_stop(struct snd_timer * timer)
1062 {
1063 struct snd_timer_system_private *priv;
1064 unsigned long jiff;
1065
1066 priv = (struct snd_timer_system_private *) timer->private_data;
1067 del_timer(&priv->tlist);
1068 jiff = jiffies;
1069 if (time_before(jiff, priv->last_expires))
1070 timer->sticks = priv->last_expires - jiff;
1071 else
1072 timer->sticks = 1;
1073 priv->correction = 0;
1074 return 0;
1075 }
1076
1077 static struct snd_timer_hardware snd_timer_system =
1078 {
1079 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1080 .resolution = 1000000000L / HZ,
1081 .ticks = 10000000L,
1082 .start = snd_timer_s_start,
1083 .stop = snd_timer_s_stop
1084 };
1085
1086 static void snd_timer_free_system(struct snd_timer *timer)
1087 {
1088 kfree(timer->private_data);
1089 }
1090
1091 static int snd_timer_register_system(void)
1092 {
1093 struct snd_timer *timer;
1094 struct snd_timer_system_private *priv;
1095 int err;
1096
1097 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1098 if (err < 0)
1099 return err;
1100 strcpy(timer->name, "system timer");
1101 timer->hw = snd_timer_system;
1102 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1103 if (priv == NULL) {
1104 snd_timer_free(timer);
1105 return -ENOMEM;
1106 }
1107 init_timer(&priv->tlist);
1108 priv->tlist.function = snd_timer_s_function;
1109 priv->tlist.data = (unsigned long) timer;
1110 timer->private_data = priv;
1111 timer->private_free = snd_timer_free_system;
1112 return snd_timer_global_register(timer);
1113 }
1114
1115 #ifdef CONFIG_PROC_FS
1116 /*
1117 * Info interface
1118 */
1119
1120 static void snd_timer_proc_read(struct snd_info_entry *entry,
1121 struct snd_info_buffer *buffer)
1122 {
1123 struct snd_timer *timer;
1124 struct snd_timer_instance *ti;
1125
1126 mutex_lock(&register_mutex);
1127 list_for_each_entry(timer, &snd_timer_list, device_list) {
1128 if (timer->card && timer->card->shutdown)
1129 continue;
1130 switch (timer->tmr_class) {
1131 case SNDRV_TIMER_CLASS_GLOBAL:
1132 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1133 break;
1134 case SNDRV_TIMER_CLASS_CARD:
1135 snd_iprintf(buffer, "C%i-%i: ",
1136 timer->card->number, timer->tmr_device);
1137 break;
1138 case SNDRV_TIMER_CLASS_PCM:
1139 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1140 timer->tmr_device, timer->tmr_subdevice);
1141 break;
1142 default:
1143 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1144 timer->card ? timer->card->number : -1,
1145 timer->tmr_device, timer->tmr_subdevice);
1146 }
1147 snd_iprintf(buffer, "%s :", timer->name);
1148 if (timer->hw.resolution)
1149 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1150 timer->hw.resolution / 1000,
1151 timer->hw.resolution % 1000,
1152 timer->hw.ticks);
1153 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1154 snd_iprintf(buffer, " SLAVE");
1155 snd_iprintf(buffer, "\n");
1156 list_for_each_entry(ti, &timer->open_list_head, open_list)
1157 snd_iprintf(buffer, " Client %s : %s\n",
1158 ti->owner ? ti->owner : "unknown",
1159 ti->flags & (SNDRV_TIMER_IFLG_START |
1160 SNDRV_TIMER_IFLG_RUNNING)
1161 ? "running" : "stopped");
1162 }
1163 mutex_unlock(&register_mutex);
1164 }
1165
1166 static struct snd_info_entry *snd_timer_proc_entry;
1167
1168 static void __init snd_timer_proc_init(void)
1169 {
1170 struct snd_info_entry *entry;
1171
1172 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1173 if (entry != NULL) {
1174 entry->c.text.read = snd_timer_proc_read;
1175 if (snd_info_register(entry) < 0) {
1176 snd_info_free_entry(entry);
1177 entry = NULL;
1178 }
1179 }
1180 snd_timer_proc_entry = entry;
1181 }
1182
1183 static void __exit snd_timer_proc_done(void)
1184 {
1185 snd_info_free_entry(snd_timer_proc_entry);
1186 }
1187 #else /* !CONFIG_PROC_FS */
1188 #define snd_timer_proc_init()
1189 #define snd_timer_proc_done()
1190 #endif
1191
1192 /*
1193 * USER SPACE interface
1194 */
1195
1196 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1197 unsigned long resolution,
1198 unsigned long ticks)
1199 {
1200 struct snd_timer_user *tu = timeri->callback_data;
1201 struct snd_timer_read *r;
1202 int prev;
1203
1204 spin_lock(&tu->qlock);
1205 if (tu->qused > 0) {
1206 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1207 r = &tu->queue[prev];
1208 if (r->resolution == resolution) {
1209 r->ticks += ticks;
1210 goto __wake;
1211 }
1212 }
1213 if (tu->qused >= tu->queue_size) {
1214 tu->overrun++;
1215 } else {
1216 r = &tu->queue[tu->qtail++];
1217 tu->qtail %= tu->queue_size;
1218 r->resolution = resolution;
1219 r->ticks = ticks;
1220 tu->qused++;
1221 }
1222 __wake:
1223 spin_unlock(&tu->qlock);
1224 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1225 wake_up(&tu->qchange_sleep);
1226 }
1227
1228 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1229 struct snd_timer_tread *tread)
1230 {
1231 if (tu->qused >= tu->queue_size) {
1232 tu->overrun++;
1233 } else {
1234 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1235 tu->qtail %= tu->queue_size;
1236 tu->qused++;
1237 }
1238 }
1239
1240 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1241 int event,
1242 struct timespec *tstamp,
1243 unsigned long resolution)
1244 {
1245 struct snd_timer_user *tu = timeri->callback_data;
1246 struct snd_timer_tread r1;
1247 unsigned long flags;
1248
1249 if (event >= SNDRV_TIMER_EVENT_START &&
1250 event <= SNDRV_TIMER_EVENT_PAUSE)
1251 tu->tstamp = *tstamp;
1252 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1253 return;
1254 r1.event = event;
1255 r1.tstamp = *tstamp;
1256 r1.val = resolution;
1257 spin_lock_irqsave(&tu->qlock, flags);
1258 snd_timer_user_append_to_tqueue(tu, &r1);
1259 spin_unlock_irqrestore(&tu->qlock, flags);
1260 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1261 wake_up(&tu->qchange_sleep);
1262 }
1263
1264 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1265 unsigned long resolution,
1266 unsigned long ticks)
1267 {
1268 struct snd_timer_user *tu = timeri->callback_data;
1269 struct snd_timer_tread *r, r1;
1270 struct timespec tstamp;
1271 int prev, append = 0;
1272
1273 memset(&tstamp, 0, sizeof(tstamp));
1274 spin_lock(&tu->qlock);
1275 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1276 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1277 spin_unlock(&tu->qlock);
1278 return;
1279 }
1280 if (tu->last_resolution != resolution || ticks > 0) {
1281 if (timer_tstamp_monotonic)
1282 ktime_get_ts(&tstamp);
1283 else
1284 getnstimeofday(&tstamp);
1285 }
1286 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1287 tu->last_resolution != resolution) {
1288 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1289 r1.tstamp = tstamp;
1290 r1.val = resolution;
1291 snd_timer_user_append_to_tqueue(tu, &r1);
1292 tu->last_resolution = resolution;
1293 append++;
1294 }
1295 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1296 goto __wake;
1297 if (ticks == 0)
1298 goto __wake;
1299 if (tu->qused > 0) {
1300 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1301 r = &tu->tqueue[prev];
1302 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1303 r->tstamp = tstamp;
1304 r->val += ticks;
1305 append++;
1306 goto __wake;
1307 }
1308 }
1309 r1.event = SNDRV_TIMER_EVENT_TICK;
1310 r1.tstamp = tstamp;
1311 r1.val = ticks;
1312 snd_timer_user_append_to_tqueue(tu, &r1);
1313 append++;
1314 __wake:
1315 spin_unlock(&tu->qlock);
1316 if (append == 0)
1317 return;
1318 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1319 wake_up(&tu->qchange_sleep);
1320 }
1321
1322 static int snd_timer_user_open(struct inode *inode, struct file *file)
1323 {
1324 struct snd_timer_user *tu;
1325 int err;
1326
1327 err = nonseekable_open(inode, file);
1328 if (err < 0)
1329 return err;
1330
1331 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1332 if (tu == NULL)
1333 return -ENOMEM;
1334 spin_lock_init(&tu->qlock);
1335 init_waitqueue_head(&tu->qchange_sleep);
1336 mutex_init(&tu->ioctl_lock);
1337 tu->ticks = 1;
1338 tu->queue_size = 128;
1339 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1340 GFP_KERNEL);
1341 if (tu->queue == NULL) {
1342 kfree(tu);
1343 return -ENOMEM;
1344 }
1345 file->private_data = tu;
1346 return 0;
1347 }
1348
1349 static int snd_timer_user_release(struct inode *inode, struct file *file)
1350 {
1351 struct snd_timer_user *tu;
1352
1353 if (file->private_data) {
1354 tu = file->private_data;
1355 file->private_data = NULL;
1356 mutex_lock(&tu->ioctl_lock);
1357 if (tu->timeri)
1358 snd_timer_close(tu->timeri);
1359 mutex_unlock(&tu->ioctl_lock);
1360 kfree(tu->queue);
1361 kfree(tu->tqueue);
1362 kfree(tu);
1363 }
1364 return 0;
1365 }
1366
1367 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1368 {
1369 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1370 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1371 id->card = -1;
1372 id->device = -1;
1373 id->subdevice = -1;
1374 }
1375
1376 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1377 {
1378 id->dev_class = timer->tmr_class;
1379 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1380 id->card = timer->card ? timer->card->number : -1;
1381 id->device = timer->tmr_device;
1382 id->subdevice = timer->tmr_subdevice;
1383 }
1384
1385 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1386 {
1387 struct snd_timer_id id;
1388 struct snd_timer *timer;
1389 struct list_head *p;
1390
1391 if (copy_from_user(&id, _tid, sizeof(id)))
1392 return -EFAULT;
1393 mutex_lock(&register_mutex);
1394 if (id.dev_class < 0) { /* first item */
1395 if (list_empty(&snd_timer_list))
1396 snd_timer_user_zero_id(&id);
1397 else {
1398 timer = list_entry(snd_timer_list.next,
1399 struct snd_timer, device_list);
1400 snd_timer_user_copy_id(&id, timer);
1401 }
1402 } else {
1403 switch (id.dev_class) {
1404 case SNDRV_TIMER_CLASS_GLOBAL:
1405 id.device = id.device < 0 ? 0 : id.device + 1;
1406 list_for_each(p, &snd_timer_list) {
1407 timer = list_entry(p, struct snd_timer, device_list);
1408 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1409 snd_timer_user_copy_id(&id, timer);
1410 break;
1411 }
1412 if (timer->tmr_device >= id.device) {
1413 snd_timer_user_copy_id(&id, timer);
1414 break;
1415 }
1416 }
1417 if (p == &snd_timer_list)
1418 snd_timer_user_zero_id(&id);
1419 break;
1420 case SNDRV_TIMER_CLASS_CARD:
1421 case SNDRV_TIMER_CLASS_PCM:
1422 if (id.card < 0) {
1423 id.card = 0;
1424 } else {
1425 if (id.card < 0) {
1426 id.card = 0;
1427 } else {
1428 if (id.device < 0) {
1429 id.device = 0;
1430 } else {
1431 if (id.subdevice < 0) {
1432 id.subdevice = 0;
1433 } else {
1434 id.subdevice++;
1435 }
1436 }
1437 }
1438 }
1439 list_for_each(p, &snd_timer_list) {
1440 timer = list_entry(p, struct snd_timer, device_list);
1441 if (timer->tmr_class > id.dev_class) {
1442 snd_timer_user_copy_id(&id, timer);
1443 break;
1444 }
1445 if (timer->tmr_class < id.dev_class)
1446 continue;
1447 if (timer->card->number > id.card) {
1448 snd_timer_user_copy_id(&id, timer);
1449 break;
1450 }
1451 if (timer->card->number < id.card)
1452 continue;
1453 if (timer->tmr_device > id.device) {
1454 snd_timer_user_copy_id(&id, timer);
1455 break;
1456 }
1457 if (timer->tmr_device < id.device)
1458 continue;
1459 if (timer->tmr_subdevice > id.subdevice) {
1460 snd_timer_user_copy_id(&id, timer);
1461 break;
1462 }
1463 if (timer->tmr_subdevice < id.subdevice)
1464 continue;
1465 snd_timer_user_copy_id(&id, timer);
1466 break;
1467 }
1468 if (p == &snd_timer_list)
1469 snd_timer_user_zero_id(&id);
1470 break;
1471 default:
1472 snd_timer_user_zero_id(&id);
1473 }
1474 }
1475 mutex_unlock(&register_mutex);
1476 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1477 return -EFAULT;
1478 return 0;
1479 }
1480
1481 static int snd_timer_user_ginfo(struct file *file,
1482 struct snd_timer_ginfo __user *_ginfo)
1483 {
1484 struct snd_timer_ginfo *ginfo;
1485 struct snd_timer_id tid;
1486 struct snd_timer *t;
1487 struct list_head *p;
1488 int err = 0;
1489
1490 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1491 if (IS_ERR(ginfo))
1492 return PTR_ERR(ginfo);
1493
1494 tid = ginfo->tid;
1495 memset(ginfo, 0, sizeof(*ginfo));
1496 ginfo->tid = tid;
1497 mutex_lock(&register_mutex);
1498 t = snd_timer_find(&tid);
1499 if (t != NULL) {
1500 ginfo->card = t->card ? t->card->number : -1;
1501 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1502 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1503 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1504 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1505 ginfo->resolution = t->hw.resolution;
1506 if (t->hw.resolution_min > 0) {
1507 ginfo->resolution_min = t->hw.resolution_min;
1508 ginfo->resolution_max = t->hw.resolution_max;
1509 }
1510 list_for_each(p, &t->open_list_head) {
1511 ginfo->clients++;
1512 }
1513 } else {
1514 err = -ENODEV;
1515 }
1516 mutex_unlock(&register_mutex);
1517 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1518 err = -EFAULT;
1519 kfree(ginfo);
1520 return err;
1521 }
1522
1523 static int snd_timer_user_gparams(struct file *file,
1524 struct snd_timer_gparams __user *_gparams)
1525 {
1526 struct snd_timer_gparams gparams;
1527 struct snd_timer *t;
1528 int err;
1529
1530 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1531 return -EFAULT;
1532 mutex_lock(&register_mutex);
1533 t = snd_timer_find(&gparams.tid);
1534 if (!t) {
1535 err = -ENODEV;
1536 goto _error;
1537 }
1538 if (!list_empty(&t->open_list_head)) {
1539 err = -EBUSY;
1540 goto _error;
1541 }
1542 if (!t->hw.set_period) {
1543 err = -ENOSYS;
1544 goto _error;
1545 }
1546 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1547 _error:
1548 mutex_unlock(&register_mutex);
1549 return err;
1550 }
1551
1552 static int snd_timer_user_gstatus(struct file *file,
1553 struct snd_timer_gstatus __user *_gstatus)
1554 {
1555 struct snd_timer_gstatus gstatus;
1556 struct snd_timer_id tid;
1557 struct snd_timer *t;
1558 int err = 0;
1559
1560 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1561 return -EFAULT;
1562 tid = gstatus.tid;
1563 memset(&gstatus, 0, sizeof(gstatus));
1564 gstatus.tid = tid;
1565 mutex_lock(&register_mutex);
1566 t = snd_timer_find(&tid);
1567 if (t != NULL) {
1568 if (t->hw.c_resolution)
1569 gstatus.resolution = t->hw.c_resolution(t);
1570 else
1571 gstatus.resolution = t->hw.resolution;
1572 if (t->hw.precise_resolution) {
1573 t->hw.precise_resolution(t, &gstatus.resolution_num,
1574 &gstatus.resolution_den);
1575 } else {
1576 gstatus.resolution_num = gstatus.resolution;
1577 gstatus.resolution_den = 1000000000uL;
1578 }
1579 } else {
1580 err = -ENODEV;
1581 }
1582 mutex_unlock(&register_mutex);
1583 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1584 err = -EFAULT;
1585 return err;
1586 }
1587
1588 static int snd_timer_user_tselect(struct file *file,
1589 struct snd_timer_select __user *_tselect)
1590 {
1591 struct snd_timer_user *tu;
1592 struct snd_timer_select tselect;
1593 char str[32];
1594 int err = 0;
1595
1596 tu = file->private_data;
1597 if (tu->timeri) {
1598 snd_timer_close(tu->timeri);
1599 tu->timeri = NULL;
1600 }
1601 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1602 err = -EFAULT;
1603 goto __err;
1604 }
1605 sprintf(str, "application %i", current->pid);
1606 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1607 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1608 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1609 if (err < 0)
1610 goto __err;
1611
1612 kfree(tu->queue);
1613 tu->queue = NULL;
1614 kfree(tu->tqueue);
1615 tu->tqueue = NULL;
1616 if (tu->tread) {
1617 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1618 GFP_KERNEL);
1619 if (tu->tqueue == NULL)
1620 err = -ENOMEM;
1621 } else {
1622 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1623 GFP_KERNEL);
1624 if (tu->queue == NULL)
1625 err = -ENOMEM;
1626 }
1627
1628 if (err < 0) {
1629 snd_timer_close(tu->timeri);
1630 tu->timeri = NULL;
1631 } else {
1632 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1633 tu->timeri->callback = tu->tread
1634 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1635 tu->timeri->ccallback = snd_timer_user_ccallback;
1636 tu->timeri->callback_data = (void *)tu;
1637 }
1638
1639 __err:
1640 return err;
1641 }
1642
1643 static int snd_timer_user_info(struct file *file,
1644 struct snd_timer_info __user *_info)
1645 {
1646 struct snd_timer_user *tu;
1647 struct snd_timer_info *info;
1648 struct snd_timer *t;
1649 int err = 0;
1650
1651 tu = file->private_data;
1652 if (!tu->timeri)
1653 return -EBADFD;
1654 t = tu->timeri->timer;
1655 if (!t)
1656 return -EBADFD;
1657
1658 info = kzalloc(sizeof(*info), GFP_KERNEL);
1659 if (! info)
1660 return -ENOMEM;
1661 info->card = t->card ? t->card->number : -1;
1662 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1663 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1664 strlcpy(info->id, t->id, sizeof(info->id));
1665 strlcpy(info->name, t->name, sizeof(info->name));
1666 info->resolution = t->hw.resolution;
1667 if (copy_to_user(_info, info, sizeof(*_info)))
1668 err = -EFAULT;
1669 kfree(info);
1670 return err;
1671 }
1672
1673 static int snd_timer_user_params(struct file *file,
1674 struct snd_timer_params __user *_params)
1675 {
1676 struct snd_timer_user *tu;
1677 struct snd_timer_params params;
1678 struct snd_timer *t;
1679 struct snd_timer_read *tr;
1680 struct snd_timer_tread *ttr;
1681 int err;
1682
1683 tu = file->private_data;
1684 if (!tu->timeri)
1685 return -EBADFD;
1686 t = tu->timeri->timer;
1687 if (!t)
1688 return -EBADFD;
1689 if (copy_from_user(&params, _params, sizeof(params)))
1690 return -EFAULT;
1691 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1692 err = -EINVAL;
1693 goto _end;
1694 }
1695 if (params.queue_size > 0 &&
1696 (params.queue_size < 32 || params.queue_size > 1024)) {
1697 err = -EINVAL;
1698 goto _end;
1699 }
1700 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1701 (1<<SNDRV_TIMER_EVENT_TICK)|
1702 (1<<SNDRV_TIMER_EVENT_START)|
1703 (1<<SNDRV_TIMER_EVENT_STOP)|
1704 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1705 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1706 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1707 (1<<SNDRV_TIMER_EVENT_RESUME)|
1708 (1<<SNDRV_TIMER_EVENT_MSTART)|
1709 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1710 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1711 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1712 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1713 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1714 err = -EINVAL;
1715 goto _end;
1716 }
1717 snd_timer_stop(tu->timeri);
1718 spin_lock_irq(&t->lock);
1719 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1720 SNDRV_TIMER_IFLG_EXCLUSIVE|
1721 SNDRV_TIMER_IFLG_EARLY_EVENT);
1722 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1723 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1724 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1725 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1726 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1727 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1728 spin_unlock_irq(&t->lock);
1729 if (params.queue_size > 0 &&
1730 (unsigned int)tu->queue_size != params.queue_size) {
1731 if (tu->tread) {
1732 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1733 GFP_KERNEL);
1734 if (ttr) {
1735 kfree(tu->tqueue);
1736 tu->queue_size = params.queue_size;
1737 tu->tqueue = ttr;
1738 }
1739 } else {
1740 tr = kmalloc(params.queue_size * sizeof(*tr),
1741 GFP_KERNEL);
1742 if (tr) {
1743 kfree(tu->queue);
1744 tu->queue_size = params.queue_size;
1745 tu->queue = tr;
1746 }
1747 }
1748 }
1749 tu->qhead = tu->qtail = tu->qused = 0;
1750 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1751 if (tu->tread) {
1752 struct snd_timer_tread tread;
1753 tread.event = SNDRV_TIMER_EVENT_EARLY;
1754 tread.tstamp.tv_sec = 0;
1755 tread.tstamp.tv_nsec = 0;
1756 tread.val = 0;
1757 snd_timer_user_append_to_tqueue(tu, &tread);
1758 } else {
1759 struct snd_timer_read *r = &tu->queue[0];
1760 r->resolution = 0;
1761 r->ticks = 0;
1762 tu->qused++;
1763 tu->qtail++;
1764 }
1765 }
1766 tu->filter = params.filter;
1767 tu->ticks = params.ticks;
1768 err = 0;
1769 _end:
1770 if (copy_to_user(_params, &params, sizeof(params)))
1771 return -EFAULT;
1772 return err;
1773 }
1774
1775 static int snd_timer_user_status(struct file *file,
1776 struct snd_timer_status __user *_status)
1777 {
1778 struct snd_timer_user *tu;
1779 struct snd_timer_status status;
1780
1781 tu = file->private_data;
1782 if (!tu->timeri)
1783 return -EBADFD;
1784 memset(&status, 0, sizeof(status));
1785 status.tstamp = tu->tstamp;
1786 status.resolution = snd_timer_resolution(tu->timeri);
1787 status.lost = tu->timeri->lost;
1788 status.overrun = tu->overrun;
1789 spin_lock_irq(&tu->qlock);
1790 status.queue = tu->qused;
1791 spin_unlock_irq(&tu->qlock);
1792 if (copy_to_user(_status, &status, sizeof(status)))
1793 return -EFAULT;
1794 return 0;
1795 }
1796
1797 static int snd_timer_user_start(struct file *file)
1798 {
1799 int err;
1800 struct snd_timer_user *tu;
1801
1802 tu = file->private_data;
1803 if (!tu->timeri)
1804 return -EBADFD;
1805 snd_timer_stop(tu->timeri);
1806 tu->timeri->lost = 0;
1807 tu->last_resolution = 0;
1808 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1809 }
1810
1811 static int snd_timer_user_stop(struct file *file)
1812 {
1813 int err;
1814 struct snd_timer_user *tu;
1815
1816 tu = file->private_data;
1817 if (!tu->timeri)
1818 return -EBADFD;
1819 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1820 }
1821
1822 static int snd_timer_user_continue(struct file *file)
1823 {
1824 int err;
1825 struct snd_timer_user *tu;
1826
1827 tu = file->private_data;
1828 if (!tu->timeri)
1829 return -EBADFD;
1830 tu->timeri->lost = 0;
1831 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1832 }
1833
1834 static int snd_timer_user_pause(struct file *file)
1835 {
1836 int err;
1837 struct snd_timer_user *tu;
1838
1839 tu = file->private_data;
1840 if (!tu->timeri)
1841 return -EBADFD;
1842 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1843 }
1844
1845 enum {
1846 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1847 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1848 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1849 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1850 };
1851
1852 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1853 unsigned long arg)
1854 {
1855 struct snd_timer_user *tu;
1856 void __user *argp = (void __user *)arg;
1857 int __user *p = argp;
1858
1859 tu = file->private_data;
1860 switch (cmd) {
1861 case SNDRV_TIMER_IOCTL_PVERSION:
1862 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1863 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1864 return snd_timer_user_next_device(argp);
1865 case SNDRV_TIMER_IOCTL_TREAD:
1866 {
1867 int xarg;
1868
1869 if (tu->timeri) /* too late */
1870 return -EBUSY;
1871 if (get_user(xarg, p))
1872 return -EFAULT;
1873 tu->tread = xarg ? 1 : 0;
1874 return 0;
1875 }
1876 case SNDRV_TIMER_IOCTL_GINFO:
1877 return snd_timer_user_ginfo(file, argp);
1878 case SNDRV_TIMER_IOCTL_GPARAMS:
1879 return snd_timer_user_gparams(file, argp);
1880 case SNDRV_TIMER_IOCTL_GSTATUS:
1881 return snd_timer_user_gstatus(file, argp);
1882 case SNDRV_TIMER_IOCTL_SELECT:
1883 return snd_timer_user_tselect(file, argp);
1884 case SNDRV_TIMER_IOCTL_INFO:
1885 return snd_timer_user_info(file, argp);
1886 case SNDRV_TIMER_IOCTL_PARAMS:
1887 return snd_timer_user_params(file, argp);
1888 case SNDRV_TIMER_IOCTL_STATUS:
1889 return snd_timer_user_status(file, argp);
1890 case SNDRV_TIMER_IOCTL_START:
1891 case SNDRV_TIMER_IOCTL_START_OLD:
1892 return snd_timer_user_start(file);
1893 case SNDRV_TIMER_IOCTL_STOP:
1894 case SNDRV_TIMER_IOCTL_STOP_OLD:
1895 return snd_timer_user_stop(file);
1896 case SNDRV_TIMER_IOCTL_CONTINUE:
1897 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1898 return snd_timer_user_continue(file);
1899 case SNDRV_TIMER_IOCTL_PAUSE:
1900 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1901 return snd_timer_user_pause(file);
1902 }
1903 return -ENOTTY;
1904 }
1905
1906 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1907 unsigned long arg)
1908 {
1909 struct snd_timer_user *tu = file->private_data;
1910 long ret;
1911
1912 mutex_lock(&tu->ioctl_lock);
1913 ret = __snd_timer_user_ioctl(file, cmd, arg);
1914 mutex_unlock(&tu->ioctl_lock);
1915 return ret;
1916 }
1917
1918 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1919 {
1920 struct snd_timer_user *tu;
1921
1922 tu = file->private_data;
1923 return fasync_helper(fd, file, on, &tu->fasync);
1924 }
1925
1926 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1927 size_t count, loff_t *offset)
1928 {
1929 struct snd_timer_user *tu;
1930 long result = 0, unit;
1931 int qhead;
1932 int err = 0;
1933
1934 tu = file->private_data;
1935 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1936 spin_lock_irq(&tu->qlock);
1937 while ((long)count - result >= unit) {
1938 while (!tu->qused) {
1939 wait_queue_t wait;
1940
1941 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1942 err = -EAGAIN;
1943 goto _error;
1944 }
1945
1946 set_current_state(TASK_INTERRUPTIBLE);
1947 init_waitqueue_entry(&wait, current);
1948 add_wait_queue(&tu->qchange_sleep, &wait);
1949
1950 spin_unlock_irq(&tu->qlock);
1951 schedule();
1952 spin_lock_irq(&tu->qlock);
1953
1954 remove_wait_queue(&tu->qchange_sleep, &wait);
1955
1956 if (tu->disconnected) {
1957 err = -ENODEV;
1958 goto _error;
1959 }
1960 if (signal_pending(current)) {
1961 err = -ERESTARTSYS;
1962 goto _error;
1963 }
1964 }
1965
1966 qhead = tu->qhead++;
1967 tu->qhead %= tu->queue_size;
1968 spin_unlock_irq(&tu->qlock);
1969
1970 if (tu->tread) {
1971 if (copy_to_user(buffer, &tu->tqueue[qhead],
1972 sizeof(struct snd_timer_tread)))
1973 err = -EFAULT;
1974 } else {
1975 if (copy_to_user(buffer, &tu->queue[qhead],
1976 sizeof(struct snd_timer_read)))
1977 err = -EFAULT;
1978 }
1979
1980 spin_lock_irq(&tu->qlock);
1981 tu->qused--;
1982 if (err < 0)
1983 goto _error;
1984 result += unit;
1985 buffer += unit;
1986 }
1987 _error:
1988 spin_unlock_irq(&tu->qlock);
1989 return result > 0 ? result : err;
1990 }
1991
1992 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1993 {
1994 unsigned int mask;
1995 struct snd_timer_user *tu;
1996
1997 tu = file->private_data;
1998
1999 poll_wait(file, &tu->qchange_sleep, wait);
2000
2001 mask = 0;
2002 if (tu->qused)
2003 mask |= POLLIN | POLLRDNORM;
2004 if (tu->disconnected)
2005 mask |= POLLERR;
2006
2007 return mask;
2008 }
2009
2010 #ifdef CONFIG_COMPAT
2011 #include "timer_compat.c"
2012 #else
2013 #define snd_timer_user_ioctl_compat NULL
2014 #endif
2015
2016 static const struct file_operations snd_timer_f_ops =
2017 {
2018 .owner = THIS_MODULE,
2019 .read = snd_timer_user_read,
2020 .open = snd_timer_user_open,
2021 .release = snd_timer_user_release,
2022 .llseek = no_llseek,
2023 .poll = snd_timer_user_poll,
2024 .unlocked_ioctl = snd_timer_user_ioctl,
2025 .compat_ioctl = snd_timer_user_ioctl_compat,
2026 .fasync = snd_timer_user_fasync,
2027 };
2028
2029 /*
2030 * ENTRY functions
2031 */
2032
2033 static int __init alsa_timer_init(void)
2034 {
2035 int err;
2036
2037 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2038 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2039 "system timer");
2040 #endif
2041
2042 if ((err = snd_timer_register_system()) < 0)
2043 pr_err("ALSA: unable to register system timer (%i)\n", err);
2044 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2045 &snd_timer_f_ops, NULL, "timer")) < 0)
2046 pr_err("ALSA: unable to register timer device (%i)\n", err);
2047 snd_timer_proc_init();
2048 return 0;
2049 }
2050
2051 static void __exit alsa_timer_exit(void)
2052 {
2053 struct list_head *p, *n;
2054
2055 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
2056 /* unregister the system timer */
2057 list_for_each_safe(p, n, &snd_timer_list) {
2058 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
2059 snd_timer_free(timer);
2060 }
2061 snd_timer_proc_done();
2062 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2063 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2064 #endif
2065 }
2066
2067 module_init(alsa_timer_init)
2068 module_exit(alsa_timer_exit)
2069
2070 EXPORT_SYMBOL(snd_timer_open);
2071 EXPORT_SYMBOL(snd_timer_close);
2072 EXPORT_SYMBOL(snd_timer_resolution);
2073 EXPORT_SYMBOL(snd_timer_start);
2074 EXPORT_SYMBOL(snd_timer_stop);
2075 EXPORT_SYMBOL(snd_timer_continue);
2076 EXPORT_SYMBOL(snd_timer_pause);
2077 EXPORT_SYMBOL(snd_timer_new);
2078 EXPORT_SYMBOL(snd_timer_notify);
2079 EXPORT_SYMBOL(snd_timer_global_new);
2080 EXPORT_SYMBOL(snd_timer_global_free);
2081 EXPORT_SYMBOL(snd_timer_global_register);
2082 EXPORT_SYMBOL(snd_timer_interrupt);
Linux with added FPC-III support