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Merge tag 'pci-v4.5-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
[deliverable/linux.git] / sound / core / timer.c
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)
833 return -ENOMEM;
834 timer->tmr_class = tid->dev_class;
835 timer->card = card;
836 timer->tmr_device = tid->device;
837 timer->tmr_subdevice = tid->subdevice;
838 if (id)
839 strlcpy(timer->id, id, sizeof(timer->id));
840 INIT_LIST_HEAD(&timer->device_list);
841 INIT_LIST_HEAD(&timer->open_list_head);
842 INIT_LIST_HEAD(&timer->active_list_head);
843 INIT_LIST_HEAD(&timer->ack_list_head);
844 INIT_LIST_HEAD(&timer->sack_list_head);
845 spin_lock_init(&timer->lock);
846 tasklet_init(&timer->task_queue, snd_timer_tasklet,
847 (unsigned long)timer);
848 if (card != NULL) {
849 timer->module = card->module;
850 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
851 if (err < 0) {
852 snd_timer_free(timer);
853 return err;
854 }
855 }
856 if (rtimer)
857 *rtimer = timer;
858 return 0;
859 }
860
861 static int snd_timer_free(struct snd_timer *timer)
862 {
863 if (!timer)
864 return 0;
865
866 mutex_lock(&register_mutex);
867 if (! list_empty(&timer->open_list_head)) {
868 struct list_head *p, *n;
869 struct snd_timer_instance *ti;
870 pr_warn("ALSA: timer %p is busy?\n", timer);
871 list_for_each_safe(p, n, &timer->open_list_head) {
872 list_del_init(p);
873 ti = list_entry(p, struct snd_timer_instance, open_list);
874 ti->timer = NULL;
875 }
876 }
877 list_del(&timer->device_list);
878 mutex_unlock(&register_mutex);
879
880 if (timer->private_free)
881 timer->private_free(timer);
882 kfree(timer);
883 return 0;
884 }
885
886 static int snd_timer_dev_free(struct snd_device *device)
887 {
888 struct snd_timer *timer = device->device_data;
889 return snd_timer_free(timer);
890 }
891
892 static int snd_timer_dev_register(struct snd_device *dev)
893 {
894 struct snd_timer *timer = dev->device_data;
895 struct snd_timer *timer1;
896
897 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
898 return -ENXIO;
899 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
900 !timer->hw.resolution && timer->hw.c_resolution == NULL)
901 return -EINVAL;
902
903 mutex_lock(&register_mutex);
904 list_for_each_entry(timer1, &snd_timer_list, device_list) {
905 if (timer1->tmr_class > timer->tmr_class)
906 break;
907 if (timer1->tmr_class < timer->tmr_class)
908 continue;
909 if (timer1->card && timer->card) {
910 if (timer1->card->number > timer->card->number)
911 break;
912 if (timer1->card->number < timer->card->number)
913 continue;
914 }
915 if (timer1->tmr_device > timer->tmr_device)
916 break;
917 if (timer1->tmr_device < timer->tmr_device)
918 continue;
919 if (timer1->tmr_subdevice > timer->tmr_subdevice)
920 break;
921 if (timer1->tmr_subdevice < timer->tmr_subdevice)
922 continue;
923 /* conflicts.. */
924 mutex_unlock(&register_mutex);
925 return -EBUSY;
926 }
927 list_add_tail(&timer->device_list, &timer1->device_list);
928 mutex_unlock(&register_mutex);
929 return 0;
930 }
931
932 static int snd_timer_dev_disconnect(struct snd_device *device)
933 {
934 struct snd_timer *timer = device->device_data;
935 struct snd_timer_instance *ti;
936
937 mutex_lock(&register_mutex);
938 list_del_init(&timer->device_list);
939 /* wake up pending sleepers */
940 list_for_each_entry(ti, &timer->open_list_head, open_list) {
941 if (ti->disconnect)
942 ti->disconnect(ti);
943 }
944 mutex_unlock(&register_mutex);
945 return 0;
946 }
947
948 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
949 {
950 unsigned long flags;
951 unsigned long resolution = 0;
952 struct snd_timer_instance *ti, *ts;
953
954 if (timer->card && timer->card->shutdown)
955 return;
956 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
957 return;
958 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
959 event > SNDRV_TIMER_EVENT_MRESUME))
960 return;
961 spin_lock_irqsave(&timer->lock, flags);
962 if (event == SNDRV_TIMER_EVENT_MSTART ||
963 event == SNDRV_TIMER_EVENT_MCONTINUE ||
964 event == SNDRV_TIMER_EVENT_MRESUME) {
965 if (timer->hw.c_resolution)
966 resolution = timer->hw.c_resolution(timer);
967 else
968 resolution = timer->hw.resolution;
969 }
970 list_for_each_entry(ti, &timer->active_list_head, active_list) {
971 if (ti->ccallback)
972 ti->ccallback(ti, event, tstamp, resolution);
973 list_for_each_entry(ts, &ti->slave_active_head, active_list)
974 if (ts->ccallback)
975 ts->ccallback(ts, event, tstamp, resolution);
976 }
977 spin_unlock_irqrestore(&timer->lock, flags);
978 }
979
980 /*
981 * exported functions for global timers
982 */
983 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
984 {
985 struct snd_timer_id tid;
986
987 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
988 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
989 tid.card = -1;
990 tid.device = device;
991 tid.subdevice = 0;
992 return snd_timer_new(NULL, id, &tid, rtimer);
993 }
994
995 int snd_timer_global_free(struct snd_timer *timer)
996 {
997 return snd_timer_free(timer);
998 }
999
1000 int snd_timer_global_register(struct snd_timer *timer)
1001 {
1002 struct snd_device dev;
1003
1004 memset(&dev, 0, sizeof(dev));
1005 dev.device_data = timer;
1006 return snd_timer_dev_register(&dev);
1007 }
1008
1009 /*
1010 * System timer
1011 */
1012
1013 struct snd_timer_system_private {
1014 struct timer_list tlist;
1015 unsigned long last_expires;
1016 unsigned long last_jiffies;
1017 unsigned long correction;
1018 };
1019
1020 static void snd_timer_s_function(unsigned long data)
1021 {
1022 struct snd_timer *timer = (struct snd_timer *)data;
1023 struct snd_timer_system_private *priv = timer->private_data;
1024 unsigned long jiff = jiffies;
1025 if (time_after(jiff, priv->last_expires))
1026 priv->correction += (long)jiff - (long)priv->last_expires;
1027 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1028 }
1029
1030 static int snd_timer_s_start(struct snd_timer * timer)
1031 {
1032 struct snd_timer_system_private *priv;
1033 unsigned long njiff;
1034
1035 priv = (struct snd_timer_system_private *) timer->private_data;
1036 njiff = (priv->last_jiffies = jiffies);
1037 if (priv->correction > timer->sticks - 1) {
1038 priv->correction -= timer->sticks - 1;
1039 njiff++;
1040 } else {
1041 njiff += timer->sticks - priv->correction;
1042 priv->correction = 0;
1043 }
1044 priv->last_expires = priv->tlist.expires = njiff;
1045 add_timer(&priv->tlist);
1046 return 0;
1047 }
1048
1049 static int snd_timer_s_stop(struct snd_timer * timer)
1050 {
1051 struct snd_timer_system_private *priv;
1052 unsigned long jiff;
1053
1054 priv = (struct snd_timer_system_private *) timer->private_data;
1055 del_timer(&priv->tlist);
1056 jiff = jiffies;
1057 if (time_before(jiff, priv->last_expires))
1058 timer->sticks = priv->last_expires - jiff;
1059 else
1060 timer->sticks = 1;
1061 priv->correction = 0;
1062 return 0;
1063 }
1064
1065 static int snd_timer_s_close(struct snd_timer *timer)
1066 {
1067 struct snd_timer_system_private *priv;
1068
1069 priv = (struct snd_timer_system_private *)timer->private_data;
1070 del_timer_sync(&priv->tlist);
1071 return 0;
1072 }
1073
1074 static struct snd_timer_hardware snd_timer_system =
1075 {
1076 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1077 .resolution = 1000000000L / HZ,
1078 .ticks = 10000000L,
1079 .close = snd_timer_s_close,
1080 .start = snd_timer_s_start,
1081 .stop = snd_timer_s_stop
1082 };
1083
1084 static void snd_timer_free_system(struct snd_timer *timer)
1085 {
1086 kfree(timer->private_data);
1087 }
1088
1089 static int snd_timer_register_system(void)
1090 {
1091 struct snd_timer *timer;
1092 struct snd_timer_system_private *priv;
1093 int err;
1094
1095 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1096 if (err < 0)
1097 return err;
1098 strcpy(timer->name, "system timer");
1099 timer->hw = snd_timer_system;
1100 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1101 if (priv == NULL) {
1102 snd_timer_free(timer);
1103 return -ENOMEM;
1104 }
1105 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1106 timer->private_data = priv;
1107 timer->private_free = snd_timer_free_system;
1108 return snd_timer_global_register(timer);
1109 }
1110
1111 #ifdef CONFIG_SND_PROC_FS
1112 /*
1113 * Info interface
1114 */
1115
1116 static void snd_timer_proc_read(struct snd_info_entry *entry,
1117 struct snd_info_buffer *buffer)
1118 {
1119 struct snd_timer *timer;
1120 struct snd_timer_instance *ti;
1121
1122 mutex_lock(&register_mutex);
1123 list_for_each_entry(timer, &snd_timer_list, device_list) {
1124 if (timer->card && timer->card->shutdown)
1125 continue;
1126 switch (timer->tmr_class) {
1127 case SNDRV_TIMER_CLASS_GLOBAL:
1128 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1129 break;
1130 case SNDRV_TIMER_CLASS_CARD:
1131 snd_iprintf(buffer, "C%i-%i: ",
1132 timer->card->number, timer->tmr_device);
1133 break;
1134 case SNDRV_TIMER_CLASS_PCM:
1135 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1136 timer->tmr_device, timer->tmr_subdevice);
1137 break;
1138 default:
1139 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1140 timer->card ? timer->card->number : -1,
1141 timer->tmr_device, timer->tmr_subdevice);
1142 }
1143 snd_iprintf(buffer, "%s :", timer->name);
1144 if (timer->hw.resolution)
1145 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1146 timer->hw.resolution / 1000,
1147 timer->hw.resolution % 1000,
1148 timer->hw.ticks);
1149 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1150 snd_iprintf(buffer, " SLAVE");
1151 snd_iprintf(buffer, "\n");
1152 list_for_each_entry(ti, &timer->open_list_head, open_list)
1153 snd_iprintf(buffer, " Client %s : %s\n",
1154 ti->owner ? ti->owner : "unknown",
1155 ti->flags & (SNDRV_TIMER_IFLG_START |
1156 SNDRV_TIMER_IFLG_RUNNING)
1157 ? "running" : "stopped");
1158 }
1159 mutex_unlock(&register_mutex);
1160 }
1161
1162 static struct snd_info_entry *snd_timer_proc_entry;
1163
1164 static void __init snd_timer_proc_init(void)
1165 {
1166 struct snd_info_entry *entry;
1167
1168 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1169 if (entry != NULL) {
1170 entry->c.text.read = snd_timer_proc_read;
1171 if (snd_info_register(entry) < 0) {
1172 snd_info_free_entry(entry);
1173 entry = NULL;
1174 }
1175 }
1176 snd_timer_proc_entry = entry;
1177 }
1178
1179 static void __exit snd_timer_proc_done(void)
1180 {
1181 snd_info_free_entry(snd_timer_proc_entry);
1182 }
1183 #else /* !CONFIG_SND_PROC_FS */
1184 #define snd_timer_proc_init()
1185 #define snd_timer_proc_done()
1186 #endif
1187
1188 /*
1189 * USER SPACE interface
1190 */
1191
1192 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1193 unsigned long resolution,
1194 unsigned long ticks)
1195 {
1196 struct snd_timer_user *tu = timeri->callback_data;
1197 struct snd_timer_read *r;
1198 int prev;
1199
1200 spin_lock(&tu->qlock);
1201 if (tu->qused > 0) {
1202 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1203 r = &tu->queue[prev];
1204 if (r->resolution == resolution) {
1205 r->ticks += ticks;
1206 goto __wake;
1207 }
1208 }
1209 if (tu->qused >= tu->queue_size) {
1210 tu->overrun++;
1211 } else {
1212 r = &tu->queue[tu->qtail++];
1213 tu->qtail %= tu->queue_size;
1214 r->resolution = resolution;
1215 r->ticks = ticks;
1216 tu->qused++;
1217 }
1218 __wake:
1219 spin_unlock(&tu->qlock);
1220 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1221 wake_up(&tu->qchange_sleep);
1222 }
1223
1224 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1225 struct snd_timer_tread *tread)
1226 {
1227 if (tu->qused >= tu->queue_size) {
1228 tu->overrun++;
1229 } else {
1230 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1231 tu->qtail %= tu->queue_size;
1232 tu->qused++;
1233 }
1234 }
1235
1236 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1237 int event,
1238 struct timespec *tstamp,
1239 unsigned long resolution)
1240 {
1241 struct snd_timer_user *tu = timeri->callback_data;
1242 struct snd_timer_tread r1;
1243 unsigned long flags;
1244
1245 if (event >= SNDRV_TIMER_EVENT_START &&
1246 event <= SNDRV_TIMER_EVENT_PAUSE)
1247 tu->tstamp = *tstamp;
1248 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1249 return;
1250 r1.event = event;
1251 r1.tstamp = *tstamp;
1252 r1.val = resolution;
1253 spin_lock_irqsave(&tu->qlock, flags);
1254 snd_timer_user_append_to_tqueue(tu, &r1);
1255 spin_unlock_irqrestore(&tu->qlock, flags);
1256 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1257 wake_up(&tu->qchange_sleep);
1258 }
1259
1260 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1261 {
1262 struct snd_timer_user *tu = timeri->callback_data;
1263
1264 tu->disconnected = true;
1265 wake_up(&tu->qchange_sleep);
1266 }
1267
1268 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1269 unsigned long resolution,
1270 unsigned long ticks)
1271 {
1272 struct snd_timer_user *tu = timeri->callback_data;
1273 struct snd_timer_tread *r, r1;
1274 struct timespec tstamp;
1275 int prev, append = 0;
1276
1277 memset(&tstamp, 0, sizeof(tstamp));
1278 spin_lock(&tu->qlock);
1279 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1280 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1281 spin_unlock(&tu->qlock);
1282 return;
1283 }
1284 if (tu->last_resolution != resolution || ticks > 0) {
1285 if (timer_tstamp_monotonic)
1286 ktime_get_ts(&tstamp);
1287 else
1288 getnstimeofday(&tstamp);
1289 }
1290 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1291 tu->last_resolution != resolution) {
1292 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1293 r1.tstamp = tstamp;
1294 r1.val = resolution;
1295 snd_timer_user_append_to_tqueue(tu, &r1);
1296 tu->last_resolution = resolution;
1297 append++;
1298 }
1299 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1300 goto __wake;
1301 if (ticks == 0)
1302 goto __wake;
1303 if (tu->qused > 0) {
1304 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1305 r = &tu->tqueue[prev];
1306 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1307 r->tstamp = tstamp;
1308 r->val += ticks;
1309 append++;
1310 goto __wake;
1311 }
1312 }
1313 r1.event = SNDRV_TIMER_EVENT_TICK;
1314 r1.tstamp = tstamp;
1315 r1.val = ticks;
1316 snd_timer_user_append_to_tqueue(tu, &r1);
1317 append++;
1318 __wake:
1319 spin_unlock(&tu->qlock);
1320 if (append == 0)
1321 return;
1322 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1323 wake_up(&tu->qchange_sleep);
1324 }
1325
1326 static int snd_timer_user_open(struct inode *inode, struct file *file)
1327 {
1328 struct snd_timer_user *tu;
1329 int err;
1330
1331 err = nonseekable_open(inode, file);
1332 if (err < 0)
1333 return err;
1334
1335 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1336 if (tu == NULL)
1337 return -ENOMEM;
1338 spin_lock_init(&tu->qlock);
1339 init_waitqueue_head(&tu->qchange_sleep);
1340 mutex_init(&tu->ioctl_lock);
1341 tu->ticks = 1;
1342 tu->queue_size = 128;
1343 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1344 GFP_KERNEL);
1345 if (tu->queue == NULL) {
1346 kfree(tu);
1347 return -ENOMEM;
1348 }
1349 file->private_data = tu;
1350 return 0;
1351 }
1352
1353 static int snd_timer_user_release(struct inode *inode, struct file *file)
1354 {
1355 struct snd_timer_user *tu;
1356
1357 if (file->private_data) {
1358 tu = file->private_data;
1359 file->private_data = NULL;
1360 mutex_lock(&tu->ioctl_lock);
1361 if (tu->timeri)
1362 snd_timer_close(tu->timeri);
1363 mutex_unlock(&tu->ioctl_lock);
1364 kfree(tu->queue);
1365 kfree(tu->tqueue);
1366 kfree(tu);
1367 }
1368 return 0;
1369 }
1370
1371 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1372 {
1373 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1374 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1375 id->card = -1;
1376 id->device = -1;
1377 id->subdevice = -1;
1378 }
1379
1380 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1381 {
1382 id->dev_class = timer->tmr_class;
1383 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1384 id->card = timer->card ? timer->card->number : -1;
1385 id->device = timer->tmr_device;
1386 id->subdevice = timer->tmr_subdevice;
1387 }
1388
1389 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1390 {
1391 struct snd_timer_id id;
1392 struct snd_timer *timer;
1393 struct list_head *p;
1394
1395 if (copy_from_user(&id, _tid, sizeof(id)))
1396 return -EFAULT;
1397 mutex_lock(&register_mutex);
1398 if (id.dev_class < 0) { /* first item */
1399 if (list_empty(&snd_timer_list))
1400 snd_timer_user_zero_id(&id);
1401 else {
1402 timer = list_entry(snd_timer_list.next,
1403 struct snd_timer, device_list);
1404 snd_timer_user_copy_id(&id, timer);
1405 }
1406 } else {
1407 switch (id.dev_class) {
1408 case SNDRV_TIMER_CLASS_GLOBAL:
1409 id.device = id.device < 0 ? 0 : id.device + 1;
1410 list_for_each(p, &snd_timer_list) {
1411 timer = list_entry(p, struct snd_timer, device_list);
1412 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1413 snd_timer_user_copy_id(&id, timer);
1414 break;
1415 }
1416 if (timer->tmr_device >= id.device) {
1417 snd_timer_user_copy_id(&id, timer);
1418 break;
1419 }
1420 }
1421 if (p == &snd_timer_list)
1422 snd_timer_user_zero_id(&id);
1423 break;
1424 case SNDRV_TIMER_CLASS_CARD:
1425 case SNDRV_TIMER_CLASS_PCM:
1426 if (id.card < 0) {
1427 id.card = 0;
1428 } else {
1429 if (id.card < 0) {
1430 id.card = 0;
1431 } else {
1432 if (id.device < 0) {
1433 id.device = 0;
1434 } else {
1435 if (id.subdevice < 0) {
1436 id.subdevice = 0;
1437 } else {
1438 id.subdevice++;
1439 }
1440 }
1441 }
1442 }
1443 list_for_each(p, &snd_timer_list) {
1444 timer = list_entry(p, struct snd_timer, device_list);
1445 if (timer->tmr_class > id.dev_class) {
1446 snd_timer_user_copy_id(&id, timer);
1447 break;
1448 }
1449 if (timer->tmr_class < id.dev_class)
1450 continue;
1451 if (timer->card->number > id.card) {
1452 snd_timer_user_copy_id(&id, timer);
1453 break;
1454 }
1455 if (timer->card->number < id.card)
1456 continue;
1457 if (timer->tmr_device > id.device) {
1458 snd_timer_user_copy_id(&id, timer);
1459 break;
1460 }
1461 if (timer->tmr_device < id.device)
1462 continue;
1463 if (timer->tmr_subdevice > id.subdevice) {
1464 snd_timer_user_copy_id(&id, timer);
1465 break;
1466 }
1467 if (timer->tmr_subdevice < id.subdevice)
1468 continue;
1469 snd_timer_user_copy_id(&id, timer);
1470 break;
1471 }
1472 if (p == &snd_timer_list)
1473 snd_timer_user_zero_id(&id);
1474 break;
1475 default:
1476 snd_timer_user_zero_id(&id);
1477 }
1478 }
1479 mutex_unlock(&register_mutex);
1480 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1481 return -EFAULT;
1482 return 0;
1483 }
1484
1485 static int snd_timer_user_ginfo(struct file *file,
1486 struct snd_timer_ginfo __user *_ginfo)
1487 {
1488 struct snd_timer_ginfo *ginfo;
1489 struct snd_timer_id tid;
1490 struct snd_timer *t;
1491 struct list_head *p;
1492 int err = 0;
1493
1494 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1495 if (IS_ERR(ginfo))
1496 return PTR_ERR(ginfo);
1497
1498 tid = ginfo->tid;
1499 memset(ginfo, 0, sizeof(*ginfo));
1500 ginfo->tid = tid;
1501 mutex_lock(&register_mutex);
1502 t = snd_timer_find(&tid);
1503 if (t != NULL) {
1504 ginfo->card = t->card ? t->card->number : -1;
1505 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1506 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1507 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1508 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1509 ginfo->resolution = t->hw.resolution;
1510 if (t->hw.resolution_min > 0) {
1511 ginfo->resolution_min = t->hw.resolution_min;
1512 ginfo->resolution_max = t->hw.resolution_max;
1513 }
1514 list_for_each(p, &t->open_list_head) {
1515 ginfo->clients++;
1516 }
1517 } else {
1518 err = -ENODEV;
1519 }
1520 mutex_unlock(&register_mutex);
1521 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1522 err = -EFAULT;
1523 kfree(ginfo);
1524 return err;
1525 }
1526
1527 static int snd_timer_user_gparams(struct file *file,
1528 struct snd_timer_gparams __user *_gparams)
1529 {
1530 struct snd_timer_gparams gparams;
1531 struct snd_timer *t;
1532 int err;
1533
1534 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1535 return -EFAULT;
1536 mutex_lock(&register_mutex);
1537 t = snd_timer_find(&gparams.tid);
1538 if (!t) {
1539 err = -ENODEV;
1540 goto _error;
1541 }
1542 if (!list_empty(&t->open_list_head)) {
1543 err = -EBUSY;
1544 goto _error;
1545 }
1546 if (!t->hw.set_period) {
1547 err = -ENOSYS;
1548 goto _error;
1549 }
1550 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1551 _error:
1552 mutex_unlock(&register_mutex);
1553 return err;
1554 }
1555
1556 static int snd_timer_user_gstatus(struct file *file,
1557 struct snd_timer_gstatus __user *_gstatus)
1558 {
1559 struct snd_timer_gstatus gstatus;
1560 struct snd_timer_id tid;
1561 struct snd_timer *t;
1562 int err = 0;
1563
1564 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1565 return -EFAULT;
1566 tid = gstatus.tid;
1567 memset(&gstatus, 0, sizeof(gstatus));
1568 gstatus.tid = tid;
1569 mutex_lock(&register_mutex);
1570 t = snd_timer_find(&tid);
1571 if (t != NULL) {
1572 if (t->hw.c_resolution)
1573 gstatus.resolution = t->hw.c_resolution(t);
1574 else
1575 gstatus.resolution = t->hw.resolution;
1576 if (t->hw.precise_resolution) {
1577 t->hw.precise_resolution(t, &gstatus.resolution_num,
1578 &gstatus.resolution_den);
1579 } else {
1580 gstatus.resolution_num = gstatus.resolution;
1581 gstatus.resolution_den = 1000000000uL;
1582 }
1583 } else {
1584 err = -ENODEV;
1585 }
1586 mutex_unlock(&register_mutex);
1587 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1588 err = -EFAULT;
1589 return err;
1590 }
1591
1592 static int snd_timer_user_tselect(struct file *file,
1593 struct snd_timer_select __user *_tselect)
1594 {
1595 struct snd_timer_user *tu;
1596 struct snd_timer_select tselect;
1597 char str[32];
1598 int err = 0;
1599
1600 tu = file->private_data;
1601 if (tu->timeri) {
1602 snd_timer_close(tu->timeri);
1603 tu->timeri = NULL;
1604 }
1605 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1606 err = -EFAULT;
1607 goto __err;
1608 }
1609 sprintf(str, "application %i", current->pid);
1610 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1611 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1612 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1613 if (err < 0)
1614 goto __err;
1615
1616 kfree(tu->queue);
1617 tu->queue = NULL;
1618 kfree(tu->tqueue);
1619 tu->tqueue = NULL;
1620 if (tu->tread) {
1621 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1622 GFP_KERNEL);
1623 if (tu->tqueue == NULL)
1624 err = -ENOMEM;
1625 } else {
1626 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1627 GFP_KERNEL);
1628 if (tu->queue == NULL)
1629 err = -ENOMEM;
1630 }
1631
1632 if (err < 0) {
1633 snd_timer_close(tu->timeri);
1634 tu->timeri = NULL;
1635 } else {
1636 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1637 tu->timeri->callback = tu->tread
1638 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1639 tu->timeri->ccallback = snd_timer_user_ccallback;
1640 tu->timeri->callback_data = (void *)tu;
1641 tu->timeri->disconnect = snd_timer_user_disconnect;
1642 }
1643
1644 __err:
1645 return err;
1646 }
1647
1648 static int snd_timer_user_info(struct file *file,
1649 struct snd_timer_info __user *_info)
1650 {
1651 struct snd_timer_user *tu;
1652 struct snd_timer_info *info;
1653 struct snd_timer *t;
1654 int err = 0;
1655
1656 tu = file->private_data;
1657 if (!tu->timeri)
1658 return -EBADFD;
1659 t = tu->timeri->timer;
1660 if (!t)
1661 return -EBADFD;
1662
1663 info = kzalloc(sizeof(*info), GFP_KERNEL);
1664 if (! info)
1665 return -ENOMEM;
1666 info->card = t->card ? t->card->number : -1;
1667 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1668 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1669 strlcpy(info->id, t->id, sizeof(info->id));
1670 strlcpy(info->name, t->name, sizeof(info->name));
1671 info->resolution = t->hw.resolution;
1672 if (copy_to_user(_info, info, sizeof(*_info)))
1673 err = -EFAULT;
1674 kfree(info);
1675 return err;
1676 }
1677
1678 static int snd_timer_user_params(struct file *file,
1679 struct snd_timer_params __user *_params)
1680 {
1681 struct snd_timer_user *tu;
1682 struct snd_timer_params params;
1683 struct snd_timer *t;
1684 struct snd_timer_read *tr;
1685 struct snd_timer_tread *ttr;
1686 int err;
1687
1688 tu = file->private_data;
1689 if (!tu->timeri)
1690 return -EBADFD;
1691 t = tu->timeri->timer;
1692 if (!t)
1693 return -EBADFD;
1694 if (copy_from_user(&params, _params, sizeof(params)))
1695 return -EFAULT;
1696 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1697 err = -EINVAL;
1698 goto _end;
1699 }
1700 if (params.queue_size > 0 &&
1701 (params.queue_size < 32 || params.queue_size > 1024)) {
1702 err = -EINVAL;
1703 goto _end;
1704 }
1705 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1706 (1<<SNDRV_TIMER_EVENT_TICK)|
1707 (1<<SNDRV_TIMER_EVENT_START)|
1708 (1<<SNDRV_TIMER_EVENT_STOP)|
1709 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1710 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1711 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1712 (1<<SNDRV_TIMER_EVENT_RESUME)|
1713 (1<<SNDRV_TIMER_EVENT_MSTART)|
1714 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1715 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1716 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1717 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1718 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1719 err = -EINVAL;
1720 goto _end;
1721 }
1722 snd_timer_stop(tu->timeri);
1723 spin_lock_irq(&t->lock);
1724 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1725 SNDRV_TIMER_IFLG_EXCLUSIVE|
1726 SNDRV_TIMER_IFLG_EARLY_EVENT);
1727 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1728 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1729 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1730 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1731 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1732 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1733 spin_unlock_irq(&t->lock);
1734 if (params.queue_size > 0 &&
1735 (unsigned int)tu->queue_size != params.queue_size) {
1736 if (tu->tread) {
1737 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1738 GFP_KERNEL);
1739 if (ttr) {
1740 kfree(tu->tqueue);
1741 tu->queue_size = params.queue_size;
1742 tu->tqueue = ttr;
1743 }
1744 } else {
1745 tr = kmalloc(params.queue_size * sizeof(*tr),
1746 GFP_KERNEL);
1747 if (tr) {
1748 kfree(tu->queue);
1749 tu->queue_size = params.queue_size;
1750 tu->queue = tr;
1751 }
1752 }
1753 }
1754 tu->qhead = tu->qtail = tu->qused = 0;
1755 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1756 if (tu->tread) {
1757 struct snd_timer_tread tread;
1758 tread.event = SNDRV_TIMER_EVENT_EARLY;
1759 tread.tstamp.tv_sec = 0;
1760 tread.tstamp.tv_nsec = 0;
1761 tread.val = 0;
1762 snd_timer_user_append_to_tqueue(tu, &tread);
1763 } else {
1764 struct snd_timer_read *r = &tu->queue[0];
1765 r->resolution = 0;
1766 r->ticks = 0;
1767 tu->qused++;
1768 tu->qtail++;
1769 }
1770 }
1771 tu->filter = params.filter;
1772 tu->ticks = params.ticks;
1773 err = 0;
1774 _end:
1775 if (copy_to_user(_params, &params, sizeof(params)))
1776 return -EFAULT;
1777 return err;
1778 }
1779
1780 static int snd_timer_user_status(struct file *file,
1781 struct snd_timer_status __user *_status)
1782 {
1783 struct snd_timer_user *tu;
1784 struct snd_timer_status status;
1785
1786 tu = file->private_data;
1787 if (!tu->timeri)
1788 return -EBADFD;
1789 memset(&status, 0, sizeof(status));
1790 status.tstamp = tu->tstamp;
1791 status.resolution = snd_timer_resolution(tu->timeri);
1792 status.lost = tu->timeri->lost;
1793 status.overrun = tu->overrun;
1794 spin_lock_irq(&tu->qlock);
1795 status.queue = tu->qused;
1796 spin_unlock_irq(&tu->qlock);
1797 if (copy_to_user(_status, &status, sizeof(status)))
1798 return -EFAULT;
1799 return 0;
1800 }
1801
1802 static int snd_timer_user_start(struct file *file)
1803 {
1804 int err;
1805 struct snd_timer_user *tu;
1806
1807 tu = file->private_data;
1808 if (!tu->timeri)
1809 return -EBADFD;
1810 snd_timer_stop(tu->timeri);
1811 tu->timeri->lost = 0;
1812 tu->last_resolution = 0;
1813 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1814 }
1815
1816 static int snd_timer_user_stop(struct file *file)
1817 {
1818 int err;
1819 struct snd_timer_user *tu;
1820
1821 tu = file->private_data;
1822 if (!tu->timeri)
1823 return -EBADFD;
1824 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1825 }
1826
1827 static int snd_timer_user_continue(struct file *file)
1828 {
1829 int err;
1830 struct snd_timer_user *tu;
1831
1832 tu = file->private_data;
1833 if (!tu->timeri)
1834 return -EBADFD;
1835 tu->timeri->lost = 0;
1836 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1837 }
1838
1839 static int snd_timer_user_pause(struct file *file)
1840 {
1841 int err;
1842 struct snd_timer_user *tu;
1843
1844 tu = file->private_data;
1845 if (!tu->timeri)
1846 return -EBADFD;
1847 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1848 }
1849
1850 enum {
1851 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1852 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1853 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1854 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1855 };
1856
1857 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1858 unsigned long arg)
1859 {
1860 struct snd_timer_user *tu;
1861 void __user *argp = (void __user *)arg;
1862 int __user *p = argp;
1863
1864 tu = file->private_data;
1865 switch (cmd) {
1866 case SNDRV_TIMER_IOCTL_PVERSION:
1867 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1868 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1869 return snd_timer_user_next_device(argp);
1870 case SNDRV_TIMER_IOCTL_TREAD:
1871 {
1872 int xarg;
1873
1874 if (tu->timeri) /* too late */
1875 return -EBUSY;
1876 if (get_user(xarg, p))
1877 return -EFAULT;
1878 tu->tread = xarg ? 1 : 0;
1879 return 0;
1880 }
1881 case SNDRV_TIMER_IOCTL_GINFO:
1882 return snd_timer_user_ginfo(file, argp);
1883 case SNDRV_TIMER_IOCTL_GPARAMS:
1884 return snd_timer_user_gparams(file, argp);
1885 case SNDRV_TIMER_IOCTL_GSTATUS:
1886 return snd_timer_user_gstatus(file, argp);
1887 case SNDRV_TIMER_IOCTL_SELECT:
1888 return snd_timer_user_tselect(file, argp);
1889 case SNDRV_TIMER_IOCTL_INFO:
1890 return snd_timer_user_info(file, argp);
1891 case SNDRV_TIMER_IOCTL_PARAMS:
1892 return snd_timer_user_params(file, argp);
1893 case SNDRV_TIMER_IOCTL_STATUS:
1894 return snd_timer_user_status(file, argp);
1895 case SNDRV_TIMER_IOCTL_START:
1896 case SNDRV_TIMER_IOCTL_START_OLD:
1897 return snd_timer_user_start(file);
1898 case SNDRV_TIMER_IOCTL_STOP:
1899 case SNDRV_TIMER_IOCTL_STOP_OLD:
1900 return snd_timer_user_stop(file);
1901 case SNDRV_TIMER_IOCTL_CONTINUE:
1902 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1903 return snd_timer_user_continue(file);
1904 case SNDRV_TIMER_IOCTL_PAUSE:
1905 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1906 return snd_timer_user_pause(file);
1907 }
1908 return -ENOTTY;
1909 }
1910
1911 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1912 unsigned long arg)
1913 {
1914 struct snd_timer_user *tu = file->private_data;
1915 long ret;
1916
1917 mutex_lock(&tu->ioctl_lock);
1918 ret = __snd_timer_user_ioctl(file, cmd, arg);
1919 mutex_unlock(&tu->ioctl_lock);
1920 return ret;
1921 }
1922
1923 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1924 {
1925 struct snd_timer_user *tu;
1926
1927 tu = file->private_data;
1928 return fasync_helper(fd, file, on, &tu->fasync);
1929 }
1930
1931 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1932 size_t count, loff_t *offset)
1933 {
1934 struct snd_timer_user *tu;
1935 long result = 0, unit;
1936 int qhead;
1937 int err = 0;
1938
1939 tu = file->private_data;
1940 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1941 spin_lock_irq(&tu->qlock);
1942 while ((long)count - result >= unit) {
1943 while (!tu->qused) {
1944 wait_queue_t wait;
1945
1946 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1947 err = -EAGAIN;
1948 goto _error;
1949 }
1950
1951 set_current_state(TASK_INTERRUPTIBLE);
1952 init_waitqueue_entry(&wait, current);
1953 add_wait_queue(&tu->qchange_sleep, &wait);
1954
1955 spin_unlock_irq(&tu->qlock);
1956 schedule();
1957 spin_lock_irq(&tu->qlock);
1958
1959 remove_wait_queue(&tu->qchange_sleep, &wait);
1960
1961 if (tu->disconnected) {
1962 err = -ENODEV;
1963 goto _error;
1964 }
1965 if (signal_pending(current)) {
1966 err = -ERESTARTSYS;
1967 goto _error;
1968 }
1969 }
1970
1971 qhead = tu->qhead++;
1972 tu->qhead %= tu->queue_size;
1973 spin_unlock_irq(&tu->qlock);
1974
1975 if (tu->tread) {
1976 if (copy_to_user(buffer, &tu->tqueue[qhead],
1977 sizeof(struct snd_timer_tread)))
1978 err = -EFAULT;
1979 } else {
1980 if (copy_to_user(buffer, &tu->queue[qhead],
1981 sizeof(struct snd_timer_read)))
1982 err = -EFAULT;
1983 }
1984
1985 spin_lock_irq(&tu->qlock);
1986 tu->qused--;
1987 if (err < 0)
1988 goto _error;
1989 result += unit;
1990 buffer += unit;
1991 }
1992 _error:
1993 spin_unlock_irq(&tu->qlock);
1994 return result > 0 ? result : err;
1995 }
1996
1997 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1998 {
1999 unsigned int mask;
2000 struct snd_timer_user *tu;
2001
2002 tu = file->private_data;
2003
2004 poll_wait(file, &tu->qchange_sleep, wait);
2005
2006 mask = 0;
2007 if (tu->qused)
2008 mask |= POLLIN | POLLRDNORM;
2009 if (tu->disconnected)
2010 mask |= POLLERR;
2011
2012 return mask;
2013 }
2014
2015 #ifdef CONFIG_COMPAT
2016 #include "timer_compat.c"
2017 #else
2018 #define snd_timer_user_ioctl_compat NULL
2019 #endif
2020
2021 static const struct file_operations snd_timer_f_ops =
2022 {
2023 .owner = THIS_MODULE,
2024 .read = snd_timer_user_read,
2025 .open = snd_timer_user_open,
2026 .release = snd_timer_user_release,
2027 .llseek = no_llseek,
2028 .poll = snd_timer_user_poll,
2029 .unlocked_ioctl = snd_timer_user_ioctl,
2030 .compat_ioctl = snd_timer_user_ioctl_compat,
2031 .fasync = snd_timer_user_fasync,
2032 };
2033
2034 /* unregister the system timer */
2035 static void snd_timer_free_all(void)
2036 {
2037 struct snd_timer *timer, *n;
2038
2039 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2040 snd_timer_free(timer);
2041 }
2042
2043 static struct device timer_dev;
2044
2045 /*
2046 * ENTRY functions
2047 */
2048
2049 static int __init alsa_timer_init(void)
2050 {
2051 int err;
2052
2053 snd_device_initialize(&timer_dev, NULL);
2054 dev_set_name(&timer_dev, "timer");
2055
2056 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2057 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2058 "system timer");
2059 #endif
2060
2061 err = snd_timer_register_system();
2062 if (err < 0) {
2063 pr_err("ALSA: unable to register system timer (%i)\n", err);
2064 put_device(&timer_dev);
2065 return err;
2066 }
2067
2068 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2069 &snd_timer_f_ops, NULL, &timer_dev);
2070 if (err < 0) {
2071 pr_err("ALSA: unable to register timer device (%i)\n", err);
2072 snd_timer_free_all();
2073 put_device(&timer_dev);
2074 return err;
2075 }
2076
2077 snd_timer_proc_init();
2078 return 0;
2079 }
2080
2081 static void __exit alsa_timer_exit(void)
2082 {
2083 snd_unregister_device(&timer_dev);
2084 snd_timer_free_all();
2085 put_device(&timer_dev);
2086 snd_timer_proc_done();
2087 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2088 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2089 #endif
2090 }
2091
2092 module_init(alsa_timer_init)
2093 module_exit(alsa_timer_exit)
2094
2095 EXPORT_SYMBOL(snd_timer_open);
2096 EXPORT_SYMBOL(snd_timer_close);
2097 EXPORT_SYMBOL(snd_timer_resolution);
2098 EXPORT_SYMBOL(snd_timer_start);
2099 EXPORT_SYMBOL(snd_timer_stop);
2100 EXPORT_SYMBOL(snd_timer_continue);
2101 EXPORT_SYMBOL(snd_timer_pause);
2102 EXPORT_SYMBOL(snd_timer_new);
2103 EXPORT_SYMBOL(snd_timer_notify);
2104 EXPORT_SYMBOL(snd_timer_global_new);
2105 EXPORT_SYMBOL(snd_timer_global_free);
2106 EXPORT_SYMBOL(snd_timer_global_register);
2107 EXPORT_SYMBOL(snd_timer_interrupt);
Linux kernel - Deliverables
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