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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Timers abstract layer
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7#include <linux/delay.h>
8#include <linux/init.h>
9#include <linux/slab.h>
10#include <linux/time.h>
11#include <linux/mutex.h>
12#include <linux/device.h>
13#include <linux/module.h>
14#include <linux/string.h>
15#include <linux/sched/signal.h>
16#include <sound/core.h>
17#include <sound/timer.h>
18#include <sound/control.h>
19#include <sound/info.h>
20#include <sound/minors.h>
21#include <sound/initval.h>
22#include <linux/kmod.h>
23
24/* internal flags */
25#define SNDRV_TIMER_IFLG_PAUSED 0x00010000
26#define SNDRV_TIMER_IFLG_DEAD 0x00020000
27
28#if IS_ENABLED(CONFIG_SND_HRTIMER)
29#define DEFAULT_TIMER_LIMIT 4
30#else
31#define DEFAULT_TIMER_LIMIT 1
32#endif
33
34static int timer_limit = DEFAULT_TIMER_LIMIT;
35static int timer_tstamp_monotonic = 1;
36MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
37MODULE_DESCRIPTION("ALSA timer interface");
38MODULE_LICENSE("GPL");
39module_param(timer_limit, int, 0444);
40MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
41module_param(timer_tstamp_monotonic, int, 0444);
42MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
43
44MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
45MODULE_ALIAS("devname:snd/timer");
46
47struct snd_timer_user {
48 struct snd_timer_instance *timeri;
49 int tread; /* enhanced read with timestamps and events */
50 unsigned long ticks;
51 unsigned long overrun;
52 int qhead;
53 int qtail;
54 int qused;
55 int queue_size;
56 bool disconnected;
57 struct snd_timer_read *queue;
58 struct snd_timer_tread *tqueue;
59 spinlock_t qlock;
60 unsigned long last_resolution;
61 unsigned int filter;
62 struct timespec tstamp; /* trigger tstamp */
63 wait_queue_head_t qchange_sleep;
64 struct fasync_struct *fasync;
65 struct mutex ioctl_lock;
66};
67
68/* list of timers */
69static LIST_HEAD(snd_timer_list);
70
71/* list of slave instances */
72static LIST_HEAD(snd_timer_slave_list);
73
74/* lock for slave active lists */
75static DEFINE_SPINLOCK(slave_active_lock);
76
77static DEFINE_MUTEX(register_mutex);
78
79static int snd_timer_free(struct snd_timer *timer);
80static int snd_timer_dev_free(struct snd_device *device);
81static int snd_timer_dev_register(struct snd_device *device);
82static int snd_timer_dev_disconnect(struct snd_device *device);
83
84static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
85
86/*
87 * create a timer instance with the given owner string.
88 * when timer is not NULL, increments the module counter
89 */
90static struct snd_timer_instance *snd_timer_instance_new(char *owner,
91 struct snd_timer *timer)
92{
93 struct snd_timer_instance *timeri;
94 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
95 if (timeri == NULL)
96 return NULL;
97 timeri->owner = kstrdup(owner, GFP_KERNEL);
98 if (! timeri->owner) {
99 kfree(timeri);
100 return NULL;
101 }
102 INIT_LIST_HEAD(&timeri->open_list);
103 INIT_LIST_HEAD(&timeri->active_list);
104 INIT_LIST_HEAD(&timeri->ack_list);
105 INIT_LIST_HEAD(&timeri->slave_list_head);
106 INIT_LIST_HEAD(&timeri->slave_active_head);
107
108 timeri->timer = timer;
109 if (timer && !try_module_get(timer->module)) {
110 kfree(timeri->owner);
111 kfree(timeri);
112 return NULL;
113 }
114
115 return timeri;
116}
117
118/*
119 * find a timer instance from the given timer id
120 */
121static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
122{
123 struct snd_timer *timer = NULL;
124
125 list_for_each_entry(timer, &snd_timer_list, device_list) {
126 if (timer->tmr_class != tid->dev_class)
127 continue;
128 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
129 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
130 (timer->card == NULL ||
131 timer->card->number != tid->card))
132 continue;
133 if (timer->tmr_device != tid->device)
134 continue;
135 if (timer->tmr_subdevice != tid->subdevice)
136 continue;
137 return timer;
138 }
139 return NULL;
140}
141
142#ifdef CONFIG_MODULES
143
144static void snd_timer_request(struct snd_timer_id *tid)
145{
146 switch (tid->dev_class) {
147 case SNDRV_TIMER_CLASS_GLOBAL:
148 if (tid->device < timer_limit)
149 request_module("snd-timer-%i", tid->device);
150 break;
151 case SNDRV_TIMER_CLASS_CARD:
152 case SNDRV_TIMER_CLASS_PCM:
153 if (tid->card < snd_ecards_limit)
154 request_module("snd-card-%i", tid->card);
155 break;
156 default:
157 break;
158 }
159}
160
161#endif
162
163/*
164 * look for a master instance matching with the slave id of the given slave.
165 * when found, relink the open_link of the slave.
166 *
167 * call this with register_mutex down.
168 */
169static int snd_timer_check_slave(struct snd_timer_instance *slave)
170{
171 struct snd_timer *timer;
172 struct snd_timer_instance *master;
173
174 /* FIXME: it's really dumb to look up all entries.. */
175 list_for_each_entry(timer, &snd_timer_list, device_list) {
176 list_for_each_entry(master, &timer->open_list_head, open_list) {
177 if (slave->slave_class == master->slave_class &&
178 slave->slave_id == master->slave_id) {
179 if (master->timer->num_instances >=
180 master->timer->max_instances)
181 return -EBUSY;
182 list_move_tail(&slave->open_list,
183 &master->slave_list_head);
184 master->timer->num_instances++;
185 spin_lock_irq(&slave_active_lock);
186 slave->master = master;
187 slave->timer = master->timer;
188 spin_unlock_irq(&slave_active_lock);
189 return 0;
190 }
191 }
192 }
193 return 0;
194}
195
196/*
197 * look for slave instances matching with the slave id of the given master.
198 * when found, relink the open_link of slaves.
199 *
200 * call this with register_mutex down.
201 */
202static int snd_timer_check_master(struct snd_timer_instance *master)
203{
204 struct snd_timer_instance *slave, *tmp;
205
206 /* check all pending slaves */
207 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
208 if (slave->slave_class == master->slave_class &&
209 slave->slave_id == master->slave_id) {
210 if (master->timer->num_instances >=
211 master->timer->max_instances)
212 return -EBUSY;
213 list_move_tail(&slave->open_list, &master->slave_list_head);
214 master->timer->num_instances++;
215 spin_lock_irq(&slave_active_lock);
216 spin_lock(&master->timer->lock);
217 slave->master = master;
218 slave->timer = master->timer;
219 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
220 list_add_tail(&slave->active_list,
221 &master->slave_active_head);
222 spin_unlock(&master->timer->lock);
223 spin_unlock_irq(&slave_active_lock);
224 }
225 }
226 return 0;
227}
228
229static int snd_timer_close_locked(struct snd_timer_instance *timeri,
230 struct device **card_devp_to_put);
231
232/*
233 * open a timer instance
234 * when opening a master, the slave id must be here given.
235 */
236int snd_timer_open(struct snd_timer_instance **ti,
237 char *owner, struct snd_timer_id *tid,
238 unsigned int slave_id)
239{
240 struct snd_timer *timer;
241 struct snd_timer_instance *timeri = NULL;
242 struct device *card_dev_to_put = NULL;
243 int err;
244
245 mutex_lock(®ister_mutex);
246 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
247 /* open a slave instance */
248 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
249 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
250 pr_debug("ALSA: timer: invalid slave class %i\n",
251 tid->dev_sclass);
252 err = -EINVAL;
253 goto unlock;
254 }
255 timeri = snd_timer_instance_new(owner, NULL);
256 if (!timeri) {
257 err = -ENOMEM;
258 goto unlock;
259 }
260 timeri->slave_class = tid->dev_sclass;
261 timeri->slave_id = tid->device;
262 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
263 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
264 err = snd_timer_check_slave(timeri);
265 if (err < 0) {
266 snd_timer_close_locked(timeri, &card_dev_to_put);
267 timeri = NULL;
268 }
269 goto unlock;
270 }
271
272 /* open a master instance */
273 timer = snd_timer_find(tid);
274#ifdef CONFIG_MODULES
275 if (!timer) {
276 mutex_unlock(®ister_mutex);
277 snd_timer_request(tid);
278 mutex_lock(®ister_mutex);
279 timer = snd_timer_find(tid);
280 }
281#endif
282 if (!timer) {
283 err = -ENODEV;
284 goto unlock;
285 }
286 if (!list_empty(&timer->open_list_head)) {
287 struct snd_timer_instance *t =
288 list_entry(timer->open_list_head.next,
289 struct snd_timer_instance, open_list);
290 if (t->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
291 err = -EBUSY;
292 goto unlock;
293 }
294 }
295 if (timer->num_instances >= timer->max_instances) {
296 err = -EBUSY;
297 goto unlock;
298 }
299 timeri = snd_timer_instance_new(owner, timer);
300 if (!timeri) {
301 err = -ENOMEM;
302 goto unlock;
303 }
304 /* take a card refcount for safe disconnection */
305 if (timer->card)
306 get_device(&timer->card->card_dev);
307 timeri->slave_class = tid->dev_sclass;
308 timeri->slave_id = slave_id;
309
310 if (list_empty(&timer->open_list_head) && timer->hw.open) {
311 err = timer->hw.open(timer);
312 if (err) {
313 kfree(timeri->owner);
314 kfree(timeri);
315 timeri = NULL;
316
317 if (timer->card)
318 card_dev_to_put = &timer->card->card_dev;
319 module_put(timer->module);
320 goto unlock;
321 }
322 }
323
324 list_add_tail(&timeri->open_list, &timer->open_list_head);
325 timer->num_instances++;
326 err = snd_timer_check_master(timeri);
327 if (err < 0) {
328 snd_timer_close_locked(timeri, &card_dev_to_put);
329 timeri = NULL;
330 }
331
332 unlock:
333 mutex_unlock(®ister_mutex);
334 /* put_device() is called after unlock for avoiding deadlock */
335 if (card_dev_to_put)
336 put_device(card_dev_to_put);
337 *ti = timeri;
338 return err;
339}
340EXPORT_SYMBOL(snd_timer_open);
341
342/*
343 * close a timer instance
344 * call this with register_mutex down.
345 */
346static int snd_timer_close_locked(struct snd_timer_instance *timeri,
347 struct device **card_devp_to_put)
348{
349 struct snd_timer *timer = timeri->timer;
350 struct snd_timer_instance *slave, *tmp;
351
352 if (timer) {
353 spin_lock_irq(&timer->lock);
354 timeri->flags |= SNDRV_TIMER_IFLG_DEAD;
355 spin_unlock_irq(&timer->lock);
356 }
357
358 list_del(&timeri->open_list);
359
360 /* force to stop the timer */
361 snd_timer_stop(timeri);
362
363 if (timer) {
364 timer->num_instances--;
365 /* wait, until the active callback is finished */
366 spin_lock_irq(&timer->lock);
367 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
368 spin_unlock_irq(&timer->lock);
369 udelay(10);
370 spin_lock_irq(&timer->lock);
371 }
372 spin_unlock_irq(&timer->lock);
373
374 /* remove slave links */
375 spin_lock_irq(&slave_active_lock);
376 spin_lock(&timer->lock);
377 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
378 open_list) {
379 list_move_tail(&slave->open_list, &snd_timer_slave_list);
380 timer->num_instances--;
381 slave->master = NULL;
382 slave->timer = NULL;
383 list_del_init(&slave->ack_list);
384 list_del_init(&slave->active_list);
385 }
386 spin_unlock(&timer->lock);
387 spin_unlock_irq(&slave_active_lock);
388
389 /* slave doesn't need to release timer resources below */
390 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
391 timer = NULL;
392 }
393
394 if (timeri->private_free)
395 timeri->private_free(timeri);
396 kfree(timeri->owner);
397 kfree(timeri);
398
399 if (timer) {
400 if (list_empty(&timer->open_list_head) && timer->hw.close)
401 timer->hw.close(timer);
402 /* release a card refcount for safe disconnection */
403 if (timer->card)
404 *card_devp_to_put = &timer->card->card_dev;
405 module_put(timer->module);
406 }
407
408 return 0;
409}
410
411/*
412 * close a timer instance
413 */
414int snd_timer_close(struct snd_timer_instance *timeri)
415{
416 struct device *card_dev_to_put = NULL;
417 int err;
418
419 if (snd_BUG_ON(!timeri))
420 return -ENXIO;
421
422 mutex_lock(®ister_mutex);
423 err = snd_timer_close_locked(timeri, &card_dev_to_put);
424 mutex_unlock(®ister_mutex);
425 /* put_device() is called after unlock for avoiding deadlock */
426 if (card_dev_to_put)
427 put_device(card_dev_to_put);
428 return err;
429}
430EXPORT_SYMBOL(snd_timer_close);
431
432static unsigned long snd_timer_hw_resolution(struct snd_timer *timer)
433{
434 if (timer->hw.c_resolution)
435 return timer->hw.c_resolution(timer);
436 else
437 return timer->hw.resolution;
438}
439
440unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
441{
442 struct snd_timer * timer;
443 unsigned long ret = 0;
444 unsigned long flags;
445
446 if (timeri == NULL)
447 return 0;
448 timer = timeri->timer;
449 if (timer) {
450 spin_lock_irqsave(&timer->lock, flags);
451 ret = snd_timer_hw_resolution(timer);
452 spin_unlock_irqrestore(&timer->lock, flags);
453 }
454 return ret;
455}
456EXPORT_SYMBOL(snd_timer_resolution);
457
458static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
459{
460 struct snd_timer *timer = ti->timer;
461 unsigned long resolution = 0;
462 struct snd_timer_instance *ts;
463 struct timespec tstamp;
464
465 if (timer_tstamp_monotonic)
466 ktime_get_ts(&tstamp);
467 else
468 getnstimeofday(&tstamp);
469 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
470 event > SNDRV_TIMER_EVENT_PAUSE))
471 return;
472 if (timer &&
473 (event == SNDRV_TIMER_EVENT_START ||
474 event == SNDRV_TIMER_EVENT_CONTINUE))
475 resolution = snd_timer_hw_resolution(timer);
476 if (ti->ccallback)
477 ti->ccallback(ti, event, &tstamp, resolution);
478 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
479 return;
480 if (timer == NULL)
481 return;
482 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
483 return;
484 list_for_each_entry(ts, &ti->slave_active_head, active_list)
485 if (ts->ccallback)
486 ts->ccallback(ts, event + 100, &tstamp, resolution);
487}
488
489/* start/continue a master timer */
490static int snd_timer_start1(struct snd_timer_instance *timeri,
491 bool start, unsigned long ticks)
492{
493 struct snd_timer *timer;
494 int result;
495 unsigned long flags;
496
497 timer = timeri->timer;
498 if (!timer)
499 return -EINVAL;
500
501 spin_lock_irqsave(&timer->lock, flags);
502 if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
503 result = -EINVAL;
504 goto unlock;
505 }
506 if (timer->card && timer->card->shutdown) {
507 result = -ENODEV;
508 goto unlock;
509 }
510 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
511 SNDRV_TIMER_IFLG_START)) {
512 result = -EBUSY;
513 goto unlock;
514 }
515
516 if (start)
517 timeri->ticks = timeri->cticks = ticks;
518 else if (!timeri->cticks)
519 timeri->cticks = 1;
520 timeri->pticks = 0;
521
522 list_move_tail(&timeri->active_list, &timer->active_list_head);
523 if (timer->running) {
524 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
525 goto __start_now;
526 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
527 timeri->flags |= SNDRV_TIMER_IFLG_START;
528 result = 1; /* delayed start */
529 } else {
530 if (start)
531 timer->sticks = ticks;
532 timer->hw.start(timer);
533 __start_now:
534 timer->running++;
535 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
536 result = 0;
537 }
538 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
539 SNDRV_TIMER_EVENT_CONTINUE);
540 unlock:
541 spin_unlock_irqrestore(&timer->lock, flags);
542 return result;
543}
544
545/* start/continue a slave timer */
546static int snd_timer_start_slave(struct snd_timer_instance *timeri,
547 bool start)
548{
549 unsigned long flags;
550 int err;
551
552 spin_lock_irqsave(&slave_active_lock, flags);
553 if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
554 err = -EINVAL;
555 goto unlock;
556 }
557 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
558 err = -EBUSY;
559 goto unlock;
560 }
561 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
562 if (timeri->master && timeri->timer) {
563 spin_lock(&timeri->timer->lock);
564 list_add_tail(&timeri->active_list,
565 &timeri->master->slave_active_head);
566 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
567 SNDRV_TIMER_EVENT_CONTINUE);
568 spin_unlock(&timeri->timer->lock);
569 }
570 err = 1; /* delayed start */
571 unlock:
572 spin_unlock_irqrestore(&slave_active_lock, flags);
573 return err;
574}
575
576/* stop/pause a master timer */
577static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
578{
579 struct snd_timer *timer;
580 int result = 0;
581 unsigned long flags;
582
583 timer = timeri->timer;
584 if (!timer)
585 return -EINVAL;
586 spin_lock_irqsave(&timer->lock, flags);
587 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
588 SNDRV_TIMER_IFLG_START))) {
589 result = -EBUSY;
590 goto unlock;
591 }
592 list_del_init(&timeri->ack_list);
593 list_del_init(&timeri->active_list);
594 if (timer->card && timer->card->shutdown)
595 goto unlock;
596 if (stop) {
597 timeri->cticks = timeri->ticks;
598 timeri->pticks = 0;
599 }
600 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
601 !(--timer->running)) {
602 timer->hw.stop(timer);
603 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
604 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
605 snd_timer_reschedule(timer, 0);
606 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
607 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
608 timer->hw.start(timer);
609 }
610 }
611 }
612 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
613 if (stop)
614 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
615 else
616 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
617 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
618 SNDRV_TIMER_EVENT_PAUSE);
619 unlock:
620 spin_unlock_irqrestore(&timer->lock, flags);
621 return result;
622}
623
624/* stop/pause a slave timer */
625static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
626{
627 unsigned long flags;
628
629 spin_lock_irqsave(&slave_active_lock, flags);
630 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
631 spin_unlock_irqrestore(&slave_active_lock, flags);
632 return -EBUSY;
633 }
634 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
635 if (timeri->timer) {
636 spin_lock(&timeri->timer->lock);
637 list_del_init(&timeri->ack_list);
638 list_del_init(&timeri->active_list);
639 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
640 SNDRV_TIMER_EVENT_PAUSE);
641 spin_unlock(&timeri->timer->lock);
642 }
643 spin_unlock_irqrestore(&slave_active_lock, flags);
644 return 0;
645}
646
647/*
648 * start the timer instance
649 */
650int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
651{
652 if (timeri == NULL || ticks < 1)
653 return -EINVAL;
654 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
655 return snd_timer_start_slave(timeri, true);
656 else
657 return snd_timer_start1(timeri, true, ticks);
658}
659EXPORT_SYMBOL(snd_timer_start);
660
661/*
662 * stop the timer instance.
663 *
664 * do not call this from the timer callback!
665 */
666int snd_timer_stop(struct snd_timer_instance *timeri)
667{
668 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
669 return snd_timer_stop_slave(timeri, true);
670 else
671 return snd_timer_stop1(timeri, true);
672}
673EXPORT_SYMBOL(snd_timer_stop);
674
675/*
676 * start again.. the tick is kept.
677 */
678int snd_timer_continue(struct snd_timer_instance *timeri)
679{
680 /* timer can continue only after pause */
681 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
682 return -EINVAL;
683
684 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
685 return snd_timer_start_slave(timeri, false);
686 else
687 return snd_timer_start1(timeri, false, 0);
688}
689EXPORT_SYMBOL(snd_timer_continue);
690
691/*
692 * pause.. remember the ticks left
693 */
694int snd_timer_pause(struct snd_timer_instance * timeri)
695{
696 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
697 return snd_timer_stop_slave(timeri, false);
698 else
699 return snd_timer_stop1(timeri, false);
700}
701EXPORT_SYMBOL(snd_timer_pause);
702
703/*
704 * reschedule the timer
705 *
706 * start pending instances and check the scheduling ticks.
707 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
708 */
709static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
710{
711 struct snd_timer_instance *ti;
712 unsigned long ticks = ~0UL;
713
714 list_for_each_entry(ti, &timer->active_list_head, active_list) {
715 if (ti->flags & SNDRV_TIMER_IFLG_START) {
716 ti->flags &= ~SNDRV_TIMER_IFLG_START;
717 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
718 timer->running++;
719 }
720 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
721 if (ticks > ti->cticks)
722 ticks = ti->cticks;
723 }
724 }
725 if (ticks == ~0UL) {
726 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
727 return;
728 }
729 if (ticks > timer->hw.ticks)
730 ticks = timer->hw.ticks;
731 if (ticks_left != ticks)
732 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
733 timer->sticks = ticks;
734}
735
736/* call callbacks in timer ack list */
737static void snd_timer_process_callbacks(struct snd_timer *timer,
738 struct list_head *head)
739{
740 struct snd_timer_instance *ti;
741 unsigned long resolution, ticks;
742
743 while (!list_empty(head)) {
744 ti = list_first_entry(head, struct snd_timer_instance,
745 ack_list);
746
747 /* remove from ack_list and make empty */
748 list_del_init(&ti->ack_list);
749
750 if (!(ti->flags & SNDRV_TIMER_IFLG_DEAD)) {
751 ticks = ti->pticks;
752 ti->pticks = 0;
753 resolution = ti->resolution;
754 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
755 spin_unlock(&timer->lock);
756 if (ti->callback)
757 ti->callback(ti, resolution, ticks);
758 spin_lock(&timer->lock);
759 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
760 }
761 }
762}
763
764/* clear pending instances from ack list */
765static void snd_timer_clear_callbacks(struct snd_timer *timer,
766 struct list_head *head)
767{
768 unsigned long flags;
769
770 spin_lock_irqsave(&timer->lock, flags);
771 while (!list_empty(head))
772 list_del_init(head->next);
773 spin_unlock_irqrestore(&timer->lock, flags);
774}
775
776/*
777 * timer tasklet
778 *
779 */
780static void snd_timer_tasklet(unsigned long arg)
781{
782 struct snd_timer *timer = (struct snd_timer *) arg;
783 unsigned long flags;
784
785 if (timer->card && timer->card->shutdown) {
786 snd_timer_clear_callbacks(timer, &timer->sack_list_head);
787 return;
788 }
789
790 spin_lock_irqsave(&timer->lock, flags);
791 snd_timer_process_callbacks(timer, &timer->sack_list_head);
792 spin_unlock_irqrestore(&timer->lock, flags);
793}
794
795/*
796 * timer interrupt
797 *
798 * ticks_left is usually equal to timer->sticks.
799 *
800 */
801void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
802{
803 struct snd_timer_instance *ti, *ts, *tmp;
804 unsigned long resolution;
805 struct list_head *ack_list_head;
806 unsigned long flags;
807 int use_tasklet = 0;
808
809 if (timer == NULL)
810 return;
811
812 if (timer->card && timer->card->shutdown) {
813 snd_timer_clear_callbacks(timer, &timer->ack_list_head);
814 return;
815 }
816
817 spin_lock_irqsave(&timer->lock, flags);
818
819 /* remember the current resolution */
820 resolution = snd_timer_hw_resolution(timer);
821
822 /* loop for all active instances
823 * Here we cannot use list_for_each_entry because the active_list of a
824 * processed instance is relinked to done_list_head before the callback
825 * is called.
826 */
827 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
828 active_list) {
829 if (ti->flags & SNDRV_TIMER_IFLG_DEAD)
830 continue;
831 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
832 continue;
833 ti->pticks += ticks_left;
834 ti->resolution = resolution;
835 if (ti->cticks < ticks_left)
836 ti->cticks = 0;
837 else
838 ti->cticks -= ticks_left;
839 if (ti->cticks) /* not expired */
840 continue;
841 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
842 ti->cticks = ti->ticks;
843 } else {
844 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
845 --timer->running;
846 list_del_init(&ti->active_list);
847 }
848 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
849 (ti->flags & SNDRV_TIMER_IFLG_FAST))
850 ack_list_head = &timer->ack_list_head;
851 else
852 ack_list_head = &timer->sack_list_head;
853 if (list_empty(&ti->ack_list))
854 list_add_tail(&ti->ack_list, ack_list_head);
855 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
856 ts->pticks = ti->pticks;
857 ts->resolution = resolution;
858 if (list_empty(&ts->ack_list))
859 list_add_tail(&ts->ack_list, ack_list_head);
860 }
861 }
862 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
863 snd_timer_reschedule(timer, timer->sticks);
864 if (timer->running) {
865 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
866 timer->hw.stop(timer);
867 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
868 }
869 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
870 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
871 /* restart timer */
872 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
873 timer->hw.start(timer);
874 }
875 } else {
876 timer->hw.stop(timer);
877 }
878
879 /* now process all fast callbacks */
880 snd_timer_process_callbacks(timer, &timer->ack_list_head);
881
882 /* do we have any slow callbacks? */
883 use_tasklet = !list_empty(&timer->sack_list_head);
884 spin_unlock_irqrestore(&timer->lock, flags);
885
886 if (use_tasklet)
887 tasklet_schedule(&timer->task_queue);
888}
889EXPORT_SYMBOL(snd_timer_interrupt);
890
891/*
892
893 */
894
895int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
896 struct snd_timer **rtimer)
897{
898 struct snd_timer *timer;
899 int err;
900 static struct snd_device_ops ops = {
901 .dev_free = snd_timer_dev_free,
902 .dev_register = snd_timer_dev_register,
903 .dev_disconnect = snd_timer_dev_disconnect,
904 };
905
906 if (snd_BUG_ON(!tid))
907 return -EINVAL;
908 if (tid->dev_class == SNDRV_TIMER_CLASS_CARD ||
909 tid->dev_class == SNDRV_TIMER_CLASS_PCM) {
910 if (WARN_ON(!card))
911 return -EINVAL;
912 }
913 if (rtimer)
914 *rtimer = NULL;
915 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
916 if (!timer)
917 return -ENOMEM;
918 timer->tmr_class = tid->dev_class;
919 timer->card = card;
920 timer->tmr_device = tid->device;
921 timer->tmr_subdevice = tid->subdevice;
922 if (id)
923 strlcpy(timer->id, id, sizeof(timer->id));
924 timer->sticks = 1;
925 INIT_LIST_HEAD(&timer->device_list);
926 INIT_LIST_HEAD(&timer->open_list_head);
927 INIT_LIST_HEAD(&timer->active_list_head);
928 INIT_LIST_HEAD(&timer->ack_list_head);
929 INIT_LIST_HEAD(&timer->sack_list_head);
930 spin_lock_init(&timer->lock);
931 tasklet_init(&timer->task_queue, snd_timer_tasklet,
932 (unsigned long)timer);
933 timer->max_instances = 1000; /* default limit per timer */
934 if (card != NULL) {
935 timer->module = card->module;
936 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
937 if (err < 0) {
938 snd_timer_free(timer);
939 return err;
940 }
941 }
942 if (rtimer)
943 *rtimer = timer;
944 return 0;
945}
946EXPORT_SYMBOL(snd_timer_new);
947
948static int snd_timer_free(struct snd_timer *timer)
949{
950 if (!timer)
951 return 0;
952
953 mutex_lock(®ister_mutex);
954 if (! list_empty(&timer->open_list_head)) {
955 struct list_head *p, *n;
956 struct snd_timer_instance *ti;
957 pr_warn("ALSA: timer %p is busy?\n", timer);
958 list_for_each_safe(p, n, &timer->open_list_head) {
959 list_del_init(p);
960 ti = list_entry(p, struct snd_timer_instance, open_list);
961 ti->timer = NULL;
962 }
963 }
964 list_del(&timer->device_list);
965 mutex_unlock(®ister_mutex);
966
967 if (timer->private_free)
968 timer->private_free(timer);
969 kfree(timer);
970 return 0;
971}
972
973static int snd_timer_dev_free(struct snd_device *device)
974{
975 struct snd_timer *timer = device->device_data;
976 return snd_timer_free(timer);
977}
978
979static int snd_timer_dev_register(struct snd_device *dev)
980{
981 struct snd_timer *timer = dev->device_data;
982 struct snd_timer *timer1;
983
984 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
985 return -ENXIO;
986 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
987 !timer->hw.resolution && timer->hw.c_resolution == NULL)
988 return -EINVAL;
989
990 mutex_lock(®ister_mutex);
991 list_for_each_entry(timer1, &snd_timer_list, device_list) {
992 if (timer1->tmr_class > timer->tmr_class)
993 break;
994 if (timer1->tmr_class < timer->tmr_class)
995 continue;
996 if (timer1->card && timer->card) {
997 if (timer1->card->number > timer->card->number)
998 break;
999 if (timer1->card->number < timer->card->number)
1000 continue;
1001 }
1002 if (timer1->tmr_device > timer->tmr_device)
1003 break;
1004 if (timer1->tmr_device < timer->tmr_device)
1005 continue;
1006 if (timer1->tmr_subdevice > timer->tmr_subdevice)
1007 break;
1008 if (timer1->tmr_subdevice < timer->tmr_subdevice)
1009 continue;
1010 /* conflicts.. */
1011 mutex_unlock(®ister_mutex);
1012 return -EBUSY;
1013 }
1014 list_add_tail(&timer->device_list, &timer1->device_list);
1015 mutex_unlock(®ister_mutex);
1016 return 0;
1017}
1018
1019static int snd_timer_dev_disconnect(struct snd_device *device)
1020{
1021 struct snd_timer *timer = device->device_data;
1022 struct snd_timer_instance *ti;
1023
1024 mutex_lock(®ister_mutex);
1025 list_del_init(&timer->device_list);
1026 /* wake up pending sleepers */
1027 list_for_each_entry(ti, &timer->open_list_head, open_list) {
1028 if (ti->disconnect)
1029 ti->disconnect(ti);
1030 }
1031 mutex_unlock(®ister_mutex);
1032 return 0;
1033}
1034
1035void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
1036{
1037 unsigned long flags;
1038 unsigned long resolution = 0;
1039 struct snd_timer_instance *ti, *ts;
1040
1041 if (timer->card && timer->card->shutdown)
1042 return;
1043 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
1044 return;
1045 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
1046 event > SNDRV_TIMER_EVENT_MRESUME))
1047 return;
1048 spin_lock_irqsave(&timer->lock, flags);
1049 if (event == SNDRV_TIMER_EVENT_MSTART ||
1050 event == SNDRV_TIMER_EVENT_MCONTINUE ||
1051 event == SNDRV_TIMER_EVENT_MRESUME)
1052 resolution = snd_timer_hw_resolution(timer);
1053 list_for_each_entry(ti, &timer->active_list_head, active_list) {
1054 if (ti->ccallback)
1055 ti->ccallback(ti, event, tstamp, resolution);
1056 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1057 if (ts->ccallback)
1058 ts->ccallback(ts, event, tstamp, resolution);
1059 }
1060 spin_unlock_irqrestore(&timer->lock, flags);
1061}
1062EXPORT_SYMBOL(snd_timer_notify);
1063
1064/*
1065 * exported functions for global timers
1066 */
1067int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1068{
1069 struct snd_timer_id tid;
1070
1071 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1072 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1073 tid.card = -1;
1074 tid.device = device;
1075 tid.subdevice = 0;
1076 return snd_timer_new(NULL, id, &tid, rtimer);
1077}
1078EXPORT_SYMBOL(snd_timer_global_new);
1079
1080int snd_timer_global_free(struct snd_timer *timer)
1081{
1082 return snd_timer_free(timer);
1083}
1084EXPORT_SYMBOL(snd_timer_global_free);
1085
1086int snd_timer_global_register(struct snd_timer *timer)
1087{
1088 struct snd_device dev;
1089
1090 memset(&dev, 0, sizeof(dev));
1091 dev.device_data = timer;
1092 return snd_timer_dev_register(&dev);
1093}
1094EXPORT_SYMBOL(snd_timer_global_register);
1095
1096/*
1097 * System timer
1098 */
1099
1100struct snd_timer_system_private {
1101 struct timer_list tlist;
1102 struct snd_timer *snd_timer;
1103 unsigned long last_expires;
1104 unsigned long last_jiffies;
1105 unsigned long correction;
1106};
1107
1108static void snd_timer_s_function(struct timer_list *t)
1109{
1110 struct snd_timer_system_private *priv = from_timer(priv, t,
1111 tlist);
1112 struct snd_timer *timer = priv->snd_timer;
1113 unsigned long jiff = jiffies;
1114 if (time_after(jiff, priv->last_expires))
1115 priv->correction += (long)jiff - (long)priv->last_expires;
1116 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1117}
1118
1119static int snd_timer_s_start(struct snd_timer * timer)
1120{
1121 struct snd_timer_system_private *priv;
1122 unsigned long njiff;
1123
1124 priv = (struct snd_timer_system_private *) timer->private_data;
1125 njiff = (priv->last_jiffies = jiffies);
1126 if (priv->correction > timer->sticks - 1) {
1127 priv->correction -= timer->sticks - 1;
1128 njiff++;
1129 } else {
1130 njiff += timer->sticks - priv->correction;
1131 priv->correction = 0;
1132 }
1133 priv->last_expires = njiff;
1134 mod_timer(&priv->tlist, njiff);
1135 return 0;
1136}
1137
1138static int snd_timer_s_stop(struct snd_timer * timer)
1139{
1140 struct snd_timer_system_private *priv;
1141 unsigned long jiff;
1142
1143 priv = (struct snd_timer_system_private *) timer->private_data;
1144 del_timer(&priv->tlist);
1145 jiff = jiffies;
1146 if (time_before(jiff, priv->last_expires))
1147 timer->sticks = priv->last_expires - jiff;
1148 else
1149 timer->sticks = 1;
1150 priv->correction = 0;
1151 return 0;
1152}
1153
1154static int snd_timer_s_close(struct snd_timer *timer)
1155{
1156 struct snd_timer_system_private *priv;
1157
1158 priv = (struct snd_timer_system_private *)timer->private_data;
1159 del_timer_sync(&priv->tlist);
1160 return 0;
1161}
1162
1163static struct snd_timer_hardware snd_timer_system =
1164{
1165 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1166 .resolution = 1000000000L / HZ,
1167 .ticks = 10000000L,
1168 .close = snd_timer_s_close,
1169 .start = snd_timer_s_start,
1170 .stop = snd_timer_s_stop
1171};
1172
1173static void snd_timer_free_system(struct snd_timer *timer)
1174{
1175 kfree(timer->private_data);
1176}
1177
1178static int snd_timer_register_system(void)
1179{
1180 struct snd_timer *timer;
1181 struct snd_timer_system_private *priv;
1182 int err;
1183
1184 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1185 if (err < 0)
1186 return err;
1187 strcpy(timer->name, "system timer");
1188 timer->hw = snd_timer_system;
1189 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1190 if (priv == NULL) {
1191 snd_timer_free(timer);
1192 return -ENOMEM;
1193 }
1194 priv->snd_timer = timer;
1195 timer_setup(&priv->tlist, snd_timer_s_function, 0);
1196 timer->private_data = priv;
1197 timer->private_free = snd_timer_free_system;
1198 return snd_timer_global_register(timer);
1199}
1200
1201#ifdef CONFIG_SND_PROC_FS
1202/*
1203 * Info interface
1204 */
1205
1206static void snd_timer_proc_read(struct snd_info_entry *entry,
1207 struct snd_info_buffer *buffer)
1208{
1209 struct snd_timer *timer;
1210 struct snd_timer_instance *ti;
1211
1212 mutex_lock(®ister_mutex);
1213 list_for_each_entry(timer, &snd_timer_list, device_list) {
1214 if (timer->card && timer->card->shutdown)
1215 continue;
1216 switch (timer->tmr_class) {
1217 case SNDRV_TIMER_CLASS_GLOBAL:
1218 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1219 break;
1220 case SNDRV_TIMER_CLASS_CARD:
1221 snd_iprintf(buffer, "C%i-%i: ",
1222 timer->card->number, timer->tmr_device);
1223 break;
1224 case SNDRV_TIMER_CLASS_PCM:
1225 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1226 timer->tmr_device, timer->tmr_subdevice);
1227 break;
1228 default:
1229 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1230 timer->card ? timer->card->number : -1,
1231 timer->tmr_device, timer->tmr_subdevice);
1232 }
1233 snd_iprintf(buffer, "%s :", timer->name);
1234 if (timer->hw.resolution)
1235 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1236 timer->hw.resolution / 1000,
1237 timer->hw.resolution % 1000,
1238 timer->hw.ticks);
1239 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1240 snd_iprintf(buffer, " SLAVE");
1241 snd_iprintf(buffer, "\n");
1242 list_for_each_entry(ti, &timer->open_list_head, open_list)
1243 snd_iprintf(buffer, " Client %s : %s\n",
1244 ti->owner ? ti->owner : "unknown",
1245 ti->flags & (SNDRV_TIMER_IFLG_START |
1246 SNDRV_TIMER_IFLG_RUNNING)
1247 ? "running" : "stopped");
1248 }
1249 mutex_unlock(®ister_mutex);
1250}
1251
1252static struct snd_info_entry *snd_timer_proc_entry;
1253
1254static void __init snd_timer_proc_init(void)
1255{
1256 struct snd_info_entry *entry;
1257
1258 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1259 if (entry != NULL) {
1260 entry->c.text.read = snd_timer_proc_read;
1261 if (snd_info_register(entry) < 0) {
1262 snd_info_free_entry(entry);
1263 entry = NULL;
1264 }
1265 }
1266 snd_timer_proc_entry = entry;
1267}
1268
1269static void __exit snd_timer_proc_done(void)
1270{
1271 snd_info_free_entry(snd_timer_proc_entry);
1272}
1273#else /* !CONFIG_SND_PROC_FS */
1274#define snd_timer_proc_init()
1275#define snd_timer_proc_done()
1276#endif
1277
1278/*
1279 * USER SPACE interface
1280 */
1281
1282static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1283 unsigned long resolution,
1284 unsigned long ticks)
1285{
1286 struct snd_timer_user *tu = timeri->callback_data;
1287 struct snd_timer_read *r;
1288 int prev;
1289
1290 spin_lock(&tu->qlock);
1291 if (tu->qused > 0) {
1292 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1293 r = &tu->queue[prev];
1294 if (r->resolution == resolution) {
1295 r->ticks += ticks;
1296 goto __wake;
1297 }
1298 }
1299 if (tu->qused >= tu->queue_size) {
1300 tu->overrun++;
1301 } else {
1302 r = &tu->queue[tu->qtail++];
1303 tu->qtail %= tu->queue_size;
1304 r->resolution = resolution;
1305 r->ticks = ticks;
1306 tu->qused++;
1307 }
1308 __wake:
1309 spin_unlock(&tu->qlock);
1310 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1311 wake_up(&tu->qchange_sleep);
1312}
1313
1314static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1315 struct snd_timer_tread *tread)
1316{
1317 if (tu->qused >= tu->queue_size) {
1318 tu->overrun++;
1319 } else {
1320 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1321 tu->qtail %= tu->queue_size;
1322 tu->qused++;
1323 }
1324}
1325
1326static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1327 int event,
1328 struct timespec *tstamp,
1329 unsigned long resolution)
1330{
1331 struct snd_timer_user *tu = timeri->callback_data;
1332 struct snd_timer_tread r1;
1333 unsigned long flags;
1334
1335 if (event >= SNDRV_TIMER_EVENT_START &&
1336 event <= SNDRV_TIMER_EVENT_PAUSE)
1337 tu->tstamp = *tstamp;
1338 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1339 return;
1340 memset(&r1, 0, sizeof(r1));
1341 r1.event = event;
1342 r1.tstamp = *tstamp;
1343 r1.val = resolution;
1344 spin_lock_irqsave(&tu->qlock, flags);
1345 snd_timer_user_append_to_tqueue(tu, &r1);
1346 spin_unlock_irqrestore(&tu->qlock, flags);
1347 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1348 wake_up(&tu->qchange_sleep);
1349}
1350
1351static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1352{
1353 struct snd_timer_user *tu = timeri->callback_data;
1354
1355 tu->disconnected = true;
1356 wake_up(&tu->qchange_sleep);
1357}
1358
1359static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1360 unsigned long resolution,
1361 unsigned long ticks)
1362{
1363 struct snd_timer_user *tu = timeri->callback_data;
1364 struct snd_timer_tread *r, r1;
1365 struct timespec tstamp;
1366 int prev, append = 0;
1367
1368 memset(&r1, 0, sizeof(r1));
1369 memset(&tstamp, 0, sizeof(tstamp));
1370 spin_lock(&tu->qlock);
1371 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1372 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1373 spin_unlock(&tu->qlock);
1374 return;
1375 }
1376 if (tu->last_resolution != resolution || ticks > 0) {
1377 if (timer_tstamp_monotonic)
1378 ktime_get_ts(&tstamp);
1379 else
1380 getnstimeofday(&tstamp);
1381 }
1382 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1383 tu->last_resolution != resolution) {
1384 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1385 r1.tstamp = tstamp;
1386 r1.val = resolution;
1387 snd_timer_user_append_to_tqueue(tu, &r1);
1388 tu->last_resolution = resolution;
1389 append++;
1390 }
1391 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1392 goto __wake;
1393 if (ticks == 0)
1394 goto __wake;
1395 if (tu->qused > 0) {
1396 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1397 r = &tu->tqueue[prev];
1398 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1399 r->tstamp = tstamp;
1400 r->val += ticks;
1401 append++;
1402 goto __wake;
1403 }
1404 }
1405 r1.event = SNDRV_TIMER_EVENT_TICK;
1406 r1.tstamp = tstamp;
1407 r1.val = ticks;
1408 snd_timer_user_append_to_tqueue(tu, &r1);
1409 append++;
1410 __wake:
1411 spin_unlock(&tu->qlock);
1412 if (append == 0)
1413 return;
1414 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1415 wake_up(&tu->qchange_sleep);
1416}
1417
1418static int realloc_user_queue(struct snd_timer_user *tu, int size)
1419{
1420 struct snd_timer_read *queue = NULL;
1421 struct snd_timer_tread *tqueue = NULL;
1422
1423 if (tu->tread) {
1424 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1425 if (!tqueue)
1426 return -ENOMEM;
1427 } else {
1428 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1429 if (!queue)
1430 return -ENOMEM;
1431 }
1432
1433 spin_lock_irq(&tu->qlock);
1434 kfree(tu->queue);
1435 kfree(tu->tqueue);
1436 tu->queue_size = size;
1437 tu->queue = queue;
1438 tu->tqueue = tqueue;
1439 tu->qhead = tu->qtail = tu->qused = 0;
1440 spin_unlock_irq(&tu->qlock);
1441
1442 return 0;
1443}
1444
1445static int snd_timer_user_open(struct inode *inode, struct file *file)
1446{
1447 struct snd_timer_user *tu;
1448 int err;
1449
1450 err = stream_open(inode, file);
1451 if (err < 0)
1452 return err;
1453
1454 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1455 if (tu == NULL)
1456 return -ENOMEM;
1457 spin_lock_init(&tu->qlock);
1458 init_waitqueue_head(&tu->qchange_sleep);
1459 mutex_init(&tu->ioctl_lock);
1460 tu->ticks = 1;
1461 if (realloc_user_queue(tu, 128) < 0) {
1462 kfree(tu);
1463 return -ENOMEM;
1464 }
1465 file->private_data = tu;
1466 return 0;
1467}
1468
1469static int snd_timer_user_release(struct inode *inode, struct file *file)
1470{
1471 struct snd_timer_user *tu;
1472
1473 if (file->private_data) {
1474 tu = file->private_data;
1475 file->private_data = NULL;
1476 mutex_lock(&tu->ioctl_lock);
1477 if (tu->timeri)
1478 snd_timer_close(tu->timeri);
1479 mutex_unlock(&tu->ioctl_lock);
1480 kfree(tu->queue);
1481 kfree(tu->tqueue);
1482 kfree(tu);
1483 }
1484 return 0;
1485}
1486
1487static void snd_timer_user_zero_id(struct snd_timer_id *id)
1488{
1489 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1490 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1491 id->card = -1;
1492 id->device = -1;
1493 id->subdevice = -1;
1494}
1495
1496static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1497{
1498 id->dev_class = timer->tmr_class;
1499 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1500 id->card = timer->card ? timer->card->number : -1;
1501 id->device = timer->tmr_device;
1502 id->subdevice = timer->tmr_subdevice;
1503}
1504
1505static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1506{
1507 struct snd_timer_id id;
1508 struct snd_timer *timer;
1509 struct list_head *p;
1510
1511 if (copy_from_user(&id, _tid, sizeof(id)))
1512 return -EFAULT;
1513 mutex_lock(®ister_mutex);
1514 if (id.dev_class < 0) { /* first item */
1515 if (list_empty(&snd_timer_list))
1516 snd_timer_user_zero_id(&id);
1517 else {
1518 timer = list_entry(snd_timer_list.next,
1519 struct snd_timer, device_list);
1520 snd_timer_user_copy_id(&id, timer);
1521 }
1522 } else {
1523 switch (id.dev_class) {
1524 case SNDRV_TIMER_CLASS_GLOBAL:
1525 id.device = id.device < 0 ? 0 : id.device + 1;
1526 list_for_each(p, &snd_timer_list) {
1527 timer = list_entry(p, struct snd_timer, device_list);
1528 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1529 snd_timer_user_copy_id(&id, timer);
1530 break;
1531 }
1532 if (timer->tmr_device >= id.device) {
1533 snd_timer_user_copy_id(&id, timer);
1534 break;
1535 }
1536 }
1537 if (p == &snd_timer_list)
1538 snd_timer_user_zero_id(&id);
1539 break;
1540 case SNDRV_TIMER_CLASS_CARD:
1541 case SNDRV_TIMER_CLASS_PCM:
1542 if (id.card < 0) {
1543 id.card = 0;
1544 } else {
1545 if (id.device < 0) {
1546 id.device = 0;
1547 } else {
1548 if (id.subdevice < 0)
1549 id.subdevice = 0;
1550 else if (id.subdevice < INT_MAX)
1551 id.subdevice++;
1552 }
1553 }
1554 list_for_each(p, &snd_timer_list) {
1555 timer = list_entry(p, struct snd_timer, device_list);
1556 if (timer->tmr_class > id.dev_class) {
1557 snd_timer_user_copy_id(&id, timer);
1558 break;
1559 }
1560 if (timer->tmr_class < id.dev_class)
1561 continue;
1562 if (timer->card->number > id.card) {
1563 snd_timer_user_copy_id(&id, timer);
1564 break;
1565 }
1566 if (timer->card->number < id.card)
1567 continue;
1568 if (timer->tmr_device > id.device) {
1569 snd_timer_user_copy_id(&id, timer);
1570 break;
1571 }
1572 if (timer->tmr_device < id.device)
1573 continue;
1574 if (timer->tmr_subdevice > id.subdevice) {
1575 snd_timer_user_copy_id(&id, timer);
1576 break;
1577 }
1578 if (timer->tmr_subdevice < id.subdevice)
1579 continue;
1580 snd_timer_user_copy_id(&id, timer);
1581 break;
1582 }
1583 if (p == &snd_timer_list)
1584 snd_timer_user_zero_id(&id);
1585 break;
1586 default:
1587 snd_timer_user_zero_id(&id);
1588 }
1589 }
1590 mutex_unlock(®ister_mutex);
1591 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1592 return -EFAULT;
1593 return 0;
1594}
1595
1596static int snd_timer_user_ginfo(struct file *file,
1597 struct snd_timer_ginfo __user *_ginfo)
1598{
1599 struct snd_timer_ginfo *ginfo;
1600 struct snd_timer_id tid;
1601 struct snd_timer *t;
1602 struct list_head *p;
1603 int err = 0;
1604
1605 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1606 if (IS_ERR(ginfo))
1607 return PTR_ERR(ginfo);
1608
1609 tid = ginfo->tid;
1610 memset(ginfo, 0, sizeof(*ginfo));
1611 ginfo->tid = tid;
1612 mutex_lock(®ister_mutex);
1613 t = snd_timer_find(&tid);
1614 if (t != NULL) {
1615 ginfo->card = t->card ? t->card->number : -1;
1616 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1617 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1618 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1619 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1620 ginfo->resolution = t->hw.resolution;
1621 if (t->hw.resolution_min > 0) {
1622 ginfo->resolution_min = t->hw.resolution_min;
1623 ginfo->resolution_max = t->hw.resolution_max;
1624 }
1625 list_for_each(p, &t->open_list_head) {
1626 ginfo->clients++;
1627 }
1628 } else {
1629 err = -ENODEV;
1630 }
1631 mutex_unlock(®ister_mutex);
1632 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1633 err = -EFAULT;
1634 kfree(ginfo);
1635 return err;
1636}
1637
1638static int timer_set_gparams(struct snd_timer_gparams *gparams)
1639{
1640 struct snd_timer *t;
1641 int err;
1642
1643 mutex_lock(®ister_mutex);
1644 t = snd_timer_find(&gparams->tid);
1645 if (!t) {
1646 err = -ENODEV;
1647 goto _error;
1648 }
1649 if (!list_empty(&t->open_list_head)) {
1650 err = -EBUSY;
1651 goto _error;
1652 }
1653 if (!t->hw.set_period) {
1654 err = -ENOSYS;
1655 goto _error;
1656 }
1657 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1658_error:
1659 mutex_unlock(®ister_mutex);
1660 return err;
1661}
1662
1663static int snd_timer_user_gparams(struct file *file,
1664 struct snd_timer_gparams __user *_gparams)
1665{
1666 struct snd_timer_gparams gparams;
1667
1668 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1669 return -EFAULT;
1670 return timer_set_gparams(&gparams);
1671}
1672
1673static int snd_timer_user_gstatus(struct file *file,
1674 struct snd_timer_gstatus __user *_gstatus)
1675{
1676 struct snd_timer_gstatus gstatus;
1677 struct snd_timer_id tid;
1678 struct snd_timer *t;
1679 int err = 0;
1680
1681 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1682 return -EFAULT;
1683 tid = gstatus.tid;
1684 memset(&gstatus, 0, sizeof(gstatus));
1685 gstatus.tid = tid;
1686 mutex_lock(®ister_mutex);
1687 t = snd_timer_find(&tid);
1688 if (t != NULL) {
1689 spin_lock_irq(&t->lock);
1690 gstatus.resolution = snd_timer_hw_resolution(t);
1691 if (t->hw.precise_resolution) {
1692 t->hw.precise_resolution(t, &gstatus.resolution_num,
1693 &gstatus.resolution_den);
1694 } else {
1695 gstatus.resolution_num = gstatus.resolution;
1696 gstatus.resolution_den = 1000000000uL;
1697 }
1698 spin_unlock_irq(&t->lock);
1699 } else {
1700 err = -ENODEV;
1701 }
1702 mutex_unlock(®ister_mutex);
1703 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1704 err = -EFAULT;
1705 return err;
1706}
1707
1708static int snd_timer_user_tselect(struct file *file,
1709 struct snd_timer_select __user *_tselect)
1710{
1711 struct snd_timer_user *tu;
1712 struct snd_timer_select tselect;
1713 char str[32];
1714 int err = 0;
1715
1716 tu = file->private_data;
1717 if (tu->timeri) {
1718 snd_timer_close(tu->timeri);
1719 tu->timeri = NULL;
1720 }
1721 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1722 err = -EFAULT;
1723 goto __err;
1724 }
1725 sprintf(str, "application %i", current->pid);
1726 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1727 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1728 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1729 if (err < 0)
1730 goto __err;
1731
1732 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1733 tu->timeri->callback = tu->tread
1734 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1735 tu->timeri->ccallback = snd_timer_user_ccallback;
1736 tu->timeri->callback_data = (void *)tu;
1737 tu->timeri->disconnect = snd_timer_user_disconnect;
1738
1739 __err:
1740 return err;
1741}
1742
1743static int snd_timer_user_info(struct file *file,
1744 struct snd_timer_info __user *_info)
1745{
1746 struct snd_timer_user *tu;
1747 struct snd_timer_info *info;
1748 struct snd_timer *t;
1749 int err = 0;
1750
1751 tu = file->private_data;
1752 if (!tu->timeri)
1753 return -EBADFD;
1754 t = tu->timeri->timer;
1755 if (!t)
1756 return -EBADFD;
1757
1758 info = kzalloc(sizeof(*info), GFP_KERNEL);
1759 if (! info)
1760 return -ENOMEM;
1761 info->card = t->card ? t->card->number : -1;
1762 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1763 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1764 strlcpy(info->id, t->id, sizeof(info->id));
1765 strlcpy(info->name, t->name, sizeof(info->name));
1766 info->resolution = t->hw.resolution;
1767 if (copy_to_user(_info, info, sizeof(*_info)))
1768 err = -EFAULT;
1769 kfree(info);
1770 return err;
1771}
1772
1773static int snd_timer_user_params(struct file *file,
1774 struct snd_timer_params __user *_params)
1775{
1776 struct snd_timer_user *tu;
1777 struct snd_timer_params params;
1778 struct snd_timer *t;
1779 int err;
1780
1781 tu = file->private_data;
1782 if (!tu->timeri)
1783 return -EBADFD;
1784 t = tu->timeri->timer;
1785 if (!t)
1786 return -EBADFD;
1787 if (copy_from_user(¶ms, _params, sizeof(params)))
1788 return -EFAULT;
1789 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1790 u64 resolution;
1791
1792 if (params.ticks < 1) {
1793 err = -EINVAL;
1794 goto _end;
1795 }
1796
1797 /* Don't allow resolution less than 1ms */
1798 resolution = snd_timer_resolution(tu->timeri);
1799 resolution *= params.ticks;
1800 if (resolution < 1000000) {
1801 err = -EINVAL;
1802 goto _end;
1803 }
1804 }
1805 if (params.queue_size > 0 &&
1806 (params.queue_size < 32 || params.queue_size > 1024)) {
1807 err = -EINVAL;
1808 goto _end;
1809 }
1810 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1811 (1<<SNDRV_TIMER_EVENT_TICK)|
1812 (1<<SNDRV_TIMER_EVENT_START)|
1813 (1<<SNDRV_TIMER_EVENT_STOP)|
1814 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1815 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1816 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1817 (1<<SNDRV_TIMER_EVENT_RESUME)|
1818 (1<<SNDRV_TIMER_EVENT_MSTART)|
1819 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1820 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1821 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1822 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1823 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1824 err = -EINVAL;
1825 goto _end;
1826 }
1827 snd_timer_stop(tu->timeri);
1828 spin_lock_irq(&t->lock);
1829 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1830 SNDRV_TIMER_IFLG_EXCLUSIVE|
1831 SNDRV_TIMER_IFLG_EARLY_EVENT);
1832 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1833 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1834 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1835 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1836 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1837 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1838 spin_unlock_irq(&t->lock);
1839 if (params.queue_size > 0 &&
1840 (unsigned int)tu->queue_size != params.queue_size) {
1841 err = realloc_user_queue(tu, params.queue_size);
1842 if (err < 0)
1843 goto _end;
1844 }
1845 spin_lock_irq(&tu->qlock);
1846 tu->qhead = tu->qtail = tu->qused = 0;
1847 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1848 if (tu->tread) {
1849 struct snd_timer_tread tread;
1850 memset(&tread, 0, sizeof(tread));
1851 tread.event = SNDRV_TIMER_EVENT_EARLY;
1852 tread.tstamp.tv_sec = 0;
1853 tread.tstamp.tv_nsec = 0;
1854 tread.val = 0;
1855 snd_timer_user_append_to_tqueue(tu, &tread);
1856 } else {
1857 struct snd_timer_read *r = &tu->queue[0];
1858 r->resolution = 0;
1859 r->ticks = 0;
1860 tu->qused++;
1861 tu->qtail++;
1862 }
1863 }
1864 tu->filter = params.filter;
1865 tu->ticks = params.ticks;
1866 spin_unlock_irq(&tu->qlock);
1867 err = 0;
1868 _end:
1869 if (copy_to_user(_params, ¶ms, sizeof(params)))
1870 return -EFAULT;
1871 return err;
1872}
1873
1874static int snd_timer_user_status(struct file *file,
1875 struct snd_timer_status __user *_status)
1876{
1877 struct snd_timer_user *tu;
1878 struct snd_timer_status status;
1879
1880 tu = file->private_data;
1881 if (!tu->timeri)
1882 return -EBADFD;
1883 memset(&status, 0, sizeof(status));
1884 status.tstamp = tu->tstamp;
1885 status.resolution = snd_timer_resolution(tu->timeri);
1886 status.lost = tu->timeri->lost;
1887 status.overrun = tu->overrun;
1888 spin_lock_irq(&tu->qlock);
1889 status.queue = tu->qused;
1890 spin_unlock_irq(&tu->qlock);
1891 if (copy_to_user(_status, &status, sizeof(status)))
1892 return -EFAULT;
1893 return 0;
1894}
1895
1896static int snd_timer_user_start(struct file *file)
1897{
1898 int err;
1899 struct snd_timer_user *tu;
1900
1901 tu = file->private_data;
1902 if (!tu->timeri)
1903 return -EBADFD;
1904 snd_timer_stop(tu->timeri);
1905 tu->timeri->lost = 0;
1906 tu->last_resolution = 0;
1907 err = snd_timer_start(tu->timeri, tu->ticks);
1908 if (err < 0)
1909 return err;
1910 return 0;
1911}
1912
1913static int snd_timer_user_stop(struct file *file)
1914{
1915 int err;
1916 struct snd_timer_user *tu;
1917
1918 tu = file->private_data;
1919 if (!tu->timeri)
1920 return -EBADFD;
1921 err = snd_timer_stop(tu->timeri);
1922 if (err < 0)
1923 return err;
1924 return 0;
1925}
1926
1927static int snd_timer_user_continue(struct file *file)
1928{
1929 int err;
1930 struct snd_timer_user *tu;
1931
1932 tu = file->private_data;
1933 if (!tu->timeri)
1934 return -EBADFD;
1935 /* start timer instead of continue if it's not used before */
1936 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1937 return snd_timer_user_start(file);
1938 tu->timeri->lost = 0;
1939 err = snd_timer_continue(tu->timeri);
1940 if (err < 0)
1941 return err;
1942 return 0;
1943}
1944
1945static int snd_timer_user_pause(struct file *file)
1946{
1947 int err;
1948 struct snd_timer_user *tu;
1949
1950 tu = file->private_data;
1951 if (!tu->timeri)
1952 return -EBADFD;
1953 err = snd_timer_pause(tu->timeri);
1954 if (err < 0)
1955 return err;
1956 return 0;
1957}
1958
1959enum {
1960 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1961 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1962 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1963 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1964};
1965
1966static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1967 unsigned long arg)
1968{
1969 struct snd_timer_user *tu;
1970 void __user *argp = (void __user *)arg;
1971 int __user *p = argp;
1972
1973 tu = file->private_data;
1974 switch (cmd) {
1975 case SNDRV_TIMER_IOCTL_PVERSION:
1976 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1977 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1978 return snd_timer_user_next_device(argp);
1979 case SNDRV_TIMER_IOCTL_TREAD:
1980 {
1981 int xarg, old_tread;
1982
1983 if (tu->timeri) /* too late */
1984 return -EBUSY;
1985 if (get_user(xarg, p))
1986 return -EFAULT;
1987 old_tread = tu->tread;
1988 tu->tread = xarg ? 1 : 0;
1989 if (tu->tread != old_tread &&
1990 realloc_user_queue(tu, tu->queue_size) < 0) {
1991 tu->tread = old_tread;
1992 return -ENOMEM;
1993 }
1994 return 0;
1995 }
1996 case SNDRV_TIMER_IOCTL_GINFO:
1997 return snd_timer_user_ginfo(file, argp);
1998 case SNDRV_TIMER_IOCTL_GPARAMS:
1999 return snd_timer_user_gparams(file, argp);
2000 case SNDRV_TIMER_IOCTL_GSTATUS:
2001 return snd_timer_user_gstatus(file, argp);
2002 case SNDRV_TIMER_IOCTL_SELECT:
2003 return snd_timer_user_tselect(file, argp);
2004 case SNDRV_TIMER_IOCTL_INFO:
2005 return snd_timer_user_info(file, argp);
2006 case SNDRV_TIMER_IOCTL_PARAMS:
2007 return snd_timer_user_params(file, argp);
2008 case SNDRV_TIMER_IOCTL_STATUS:
2009 return snd_timer_user_status(file, argp);
2010 case SNDRV_TIMER_IOCTL_START:
2011 case SNDRV_TIMER_IOCTL_START_OLD:
2012 return snd_timer_user_start(file);
2013 case SNDRV_TIMER_IOCTL_STOP:
2014 case SNDRV_TIMER_IOCTL_STOP_OLD:
2015 return snd_timer_user_stop(file);
2016 case SNDRV_TIMER_IOCTL_CONTINUE:
2017 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
2018 return snd_timer_user_continue(file);
2019 case SNDRV_TIMER_IOCTL_PAUSE:
2020 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
2021 return snd_timer_user_pause(file);
2022 }
2023 return -ENOTTY;
2024}
2025
2026static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
2027 unsigned long arg)
2028{
2029 struct snd_timer_user *tu = file->private_data;
2030 long ret;
2031
2032 mutex_lock(&tu->ioctl_lock);
2033 ret = __snd_timer_user_ioctl(file, cmd, arg);
2034 mutex_unlock(&tu->ioctl_lock);
2035 return ret;
2036}
2037
2038static int snd_timer_user_fasync(int fd, struct file * file, int on)
2039{
2040 struct snd_timer_user *tu;
2041
2042 tu = file->private_data;
2043 return fasync_helper(fd, file, on, &tu->fasync);
2044}
2045
2046static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
2047 size_t count, loff_t *offset)
2048{
2049 struct snd_timer_user *tu;
2050 long result = 0, unit;
2051 int qhead;
2052 int err = 0;
2053
2054 tu = file->private_data;
2055 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
2056 mutex_lock(&tu->ioctl_lock);
2057 spin_lock_irq(&tu->qlock);
2058 while ((long)count - result >= unit) {
2059 while (!tu->qused) {
2060 wait_queue_entry_t wait;
2061
2062 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
2063 err = -EAGAIN;
2064 goto _error;
2065 }
2066
2067 set_current_state(TASK_INTERRUPTIBLE);
2068 init_waitqueue_entry(&wait, current);
2069 add_wait_queue(&tu->qchange_sleep, &wait);
2070
2071 spin_unlock_irq(&tu->qlock);
2072 mutex_unlock(&tu->ioctl_lock);
2073 schedule();
2074 mutex_lock(&tu->ioctl_lock);
2075 spin_lock_irq(&tu->qlock);
2076
2077 remove_wait_queue(&tu->qchange_sleep, &wait);
2078
2079 if (tu->disconnected) {
2080 err = -ENODEV;
2081 goto _error;
2082 }
2083 if (signal_pending(current)) {
2084 err = -ERESTARTSYS;
2085 goto _error;
2086 }
2087 }
2088
2089 qhead = tu->qhead++;
2090 tu->qhead %= tu->queue_size;
2091 tu->qused--;
2092 spin_unlock_irq(&tu->qlock);
2093
2094 if (tu->tread) {
2095 if (copy_to_user(buffer, &tu->tqueue[qhead],
2096 sizeof(struct snd_timer_tread)))
2097 err = -EFAULT;
2098 } else {
2099 if (copy_to_user(buffer, &tu->queue[qhead],
2100 sizeof(struct snd_timer_read)))
2101 err = -EFAULT;
2102 }
2103
2104 spin_lock_irq(&tu->qlock);
2105 if (err < 0)
2106 goto _error;
2107 result += unit;
2108 buffer += unit;
2109 }
2110 _error:
2111 spin_unlock_irq(&tu->qlock);
2112 mutex_unlock(&tu->ioctl_lock);
2113 return result > 0 ? result : err;
2114}
2115
2116static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait)
2117{
2118 __poll_t mask;
2119 struct snd_timer_user *tu;
2120
2121 tu = file->private_data;
2122
2123 poll_wait(file, &tu->qchange_sleep, wait);
2124
2125 mask = 0;
2126 spin_lock_irq(&tu->qlock);
2127 if (tu->qused)
2128 mask |= EPOLLIN | EPOLLRDNORM;
2129 if (tu->disconnected)
2130 mask |= EPOLLERR;
2131 spin_unlock_irq(&tu->qlock);
2132
2133 return mask;
2134}
2135
2136#ifdef CONFIG_COMPAT
2137#include "timer_compat.c"
2138#else
2139#define snd_timer_user_ioctl_compat NULL
2140#endif
2141
2142static const struct file_operations snd_timer_f_ops =
2143{
2144 .owner = THIS_MODULE,
2145 .read = snd_timer_user_read,
2146 .open = snd_timer_user_open,
2147 .release = snd_timer_user_release,
2148 .llseek = no_llseek,
2149 .poll = snd_timer_user_poll,
2150 .unlocked_ioctl = snd_timer_user_ioctl,
2151 .compat_ioctl = snd_timer_user_ioctl_compat,
2152 .fasync = snd_timer_user_fasync,
2153};
2154
2155/* unregister the system timer */
2156static void snd_timer_free_all(void)
2157{
2158 struct snd_timer *timer, *n;
2159
2160 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2161 snd_timer_free(timer);
2162}
2163
2164static struct device timer_dev;
2165
2166/*
2167 * ENTRY functions
2168 */
2169
2170static int __init alsa_timer_init(void)
2171{
2172 int err;
2173
2174 snd_device_initialize(&timer_dev, NULL);
2175 dev_set_name(&timer_dev, "timer");
2176
2177#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2178 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2179 "system timer");
2180#endif
2181
2182 err = snd_timer_register_system();
2183 if (err < 0) {
2184 pr_err("ALSA: unable to register system timer (%i)\n", err);
2185 goto put_timer;
2186 }
2187
2188 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2189 &snd_timer_f_ops, NULL, &timer_dev);
2190 if (err < 0) {
2191 pr_err("ALSA: unable to register timer device (%i)\n", err);
2192 snd_timer_free_all();
2193 goto put_timer;
2194 }
2195
2196 snd_timer_proc_init();
2197 return 0;
2198
2199put_timer:
2200 put_device(&timer_dev);
2201 return err;
2202}
2203
2204static void __exit alsa_timer_exit(void)
2205{
2206 snd_unregister_device(&timer_dev);
2207 snd_timer_free_all();
2208 put_device(&timer_dev);
2209 snd_timer_proc_done();
2210#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2211 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2212#endif
2213}
2214
2215module_init(alsa_timer_init)
2216module_exit(alsa_timer_exit)
1/*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <linux/delay.h>
23#include <linux/init.h>
24#include <linux/slab.h>
25#include <linux/time.h>
26#include <linux/mutex.h>
27#include <linux/moduleparam.h>
28#include <linux/string.h>
29#include <sound/core.h>
30#include <sound/timer.h>
31#include <sound/control.h>
32#include <sound/info.h>
33#include <sound/minors.h>
34#include <sound/initval.h>
35#include <linux/kmod.h>
36
37#if defined(CONFIG_SND_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE)
38#define DEFAULT_TIMER_LIMIT 4
39#elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
40#define DEFAULT_TIMER_LIMIT 2
41#else
42#define DEFAULT_TIMER_LIMIT 1
43#endif
44
45static int timer_limit = DEFAULT_TIMER_LIMIT;
46static int timer_tstamp_monotonic = 1;
47MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
48MODULE_DESCRIPTION("ALSA timer interface");
49MODULE_LICENSE("GPL");
50module_param(timer_limit, int, 0444);
51MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
52module_param(timer_tstamp_monotonic, int, 0444);
53MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
54
55MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
56MODULE_ALIAS("devname:snd/timer");
57
58struct snd_timer_user {
59 struct snd_timer_instance *timeri;
60 int tread; /* enhanced read with timestamps and events */
61 unsigned long ticks;
62 unsigned long overrun;
63 int qhead;
64 int qtail;
65 int qused;
66 int queue_size;
67 struct snd_timer_read *queue;
68 struct snd_timer_tread *tqueue;
69 spinlock_t qlock;
70 unsigned long last_resolution;
71 unsigned int filter;
72 struct timespec tstamp; /* trigger tstamp */
73 wait_queue_head_t qchange_sleep;
74 struct fasync_struct *fasync;
75 struct mutex tread_sem;
76};
77
78/* list of timers */
79static LIST_HEAD(snd_timer_list);
80
81/* list of slave instances */
82static LIST_HEAD(snd_timer_slave_list);
83
84/* lock for slave active lists */
85static DEFINE_SPINLOCK(slave_active_lock);
86
87static DEFINE_MUTEX(register_mutex);
88
89static int snd_timer_free(struct snd_timer *timer);
90static int snd_timer_dev_free(struct snd_device *device);
91static int snd_timer_dev_register(struct snd_device *device);
92static int snd_timer_dev_disconnect(struct snd_device *device);
93
94static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
95
96/*
97 * create a timer instance with the given owner string.
98 * when timer is not NULL, increments the module counter
99 */
100static struct snd_timer_instance *snd_timer_instance_new(char *owner,
101 struct snd_timer *timer)
102{
103 struct snd_timer_instance *timeri;
104 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
105 if (timeri == NULL)
106 return NULL;
107 timeri->owner = kstrdup(owner, GFP_KERNEL);
108 if (! timeri->owner) {
109 kfree(timeri);
110 return NULL;
111 }
112 INIT_LIST_HEAD(&timeri->open_list);
113 INIT_LIST_HEAD(&timeri->active_list);
114 INIT_LIST_HEAD(&timeri->ack_list);
115 INIT_LIST_HEAD(&timeri->slave_list_head);
116 INIT_LIST_HEAD(&timeri->slave_active_head);
117
118 timeri->timer = timer;
119 if (timer && !try_module_get(timer->module)) {
120 kfree(timeri->owner);
121 kfree(timeri);
122 return NULL;
123 }
124
125 return timeri;
126}
127
128/*
129 * find a timer instance from the given timer id
130 */
131static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
132{
133 struct snd_timer *timer = NULL;
134
135 list_for_each_entry(timer, &snd_timer_list, device_list) {
136 if (timer->tmr_class != tid->dev_class)
137 continue;
138 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
139 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
140 (timer->card == NULL ||
141 timer->card->number != tid->card))
142 continue;
143 if (timer->tmr_device != tid->device)
144 continue;
145 if (timer->tmr_subdevice != tid->subdevice)
146 continue;
147 return timer;
148 }
149 return NULL;
150}
151
152#ifdef CONFIG_MODULES
153
154static void snd_timer_request(struct snd_timer_id *tid)
155{
156 switch (tid->dev_class) {
157 case SNDRV_TIMER_CLASS_GLOBAL:
158 if (tid->device < timer_limit)
159 request_module("snd-timer-%i", tid->device);
160 break;
161 case SNDRV_TIMER_CLASS_CARD:
162 case SNDRV_TIMER_CLASS_PCM:
163 if (tid->card < snd_ecards_limit)
164 request_module("snd-card-%i", tid->card);
165 break;
166 default:
167 break;
168 }
169}
170
171#endif
172
173/*
174 * look for a master instance matching with the slave id of the given slave.
175 * when found, relink the open_link of the slave.
176 *
177 * call this with register_mutex down.
178 */
179static void snd_timer_check_slave(struct snd_timer_instance *slave)
180{
181 struct snd_timer *timer;
182 struct snd_timer_instance *master;
183
184 /* FIXME: it's really dumb to look up all entries.. */
185 list_for_each_entry(timer, &snd_timer_list, device_list) {
186 list_for_each_entry(master, &timer->open_list_head, open_list) {
187 if (slave->slave_class == master->slave_class &&
188 slave->slave_id == master->slave_id) {
189 list_move_tail(&slave->open_list,
190 &master->slave_list_head);
191 spin_lock_irq(&slave_active_lock);
192 slave->master = master;
193 slave->timer = master->timer;
194 spin_unlock_irq(&slave_active_lock);
195 return;
196 }
197 }
198 }
199}
200
201/*
202 * look for slave instances matching with the slave id of the given master.
203 * when found, relink the open_link of slaves.
204 *
205 * call this with register_mutex down.
206 */
207static void snd_timer_check_master(struct snd_timer_instance *master)
208{
209 struct snd_timer_instance *slave, *tmp;
210
211 /* check all pending slaves */
212 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
213 if (slave->slave_class == master->slave_class &&
214 slave->slave_id == master->slave_id) {
215 list_move_tail(&slave->open_list, &master->slave_list_head);
216 spin_lock_irq(&slave_active_lock);
217 slave->master = master;
218 slave->timer = master->timer;
219 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
220 list_add_tail(&slave->active_list,
221 &master->slave_active_head);
222 spin_unlock_irq(&slave_active_lock);
223 }
224 }
225}
226
227/*
228 * open a timer instance
229 * when opening a master, the slave id must be here given.
230 */
231int snd_timer_open(struct snd_timer_instance **ti,
232 char *owner, struct snd_timer_id *tid,
233 unsigned int slave_id)
234{
235 struct snd_timer *timer;
236 struct snd_timer_instance *timeri = NULL;
237
238 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
239 /* open a slave instance */
240 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
241 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
242 snd_printd("invalid slave class %i\n", tid->dev_sclass);
243 return -EINVAL;
244 }
245 mutex_lock(®ister_mutex);
246 timeri = snd_timer_instance_new(owner, NULL);
247 if (!timeri) {
248 mutex_unlock(®ister_mutex);
249 return -ENOMEM;
250 }
251 timeri->slave_class = tid->dev_sclass;
252 timeri->slave_id = tid->device;
253 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
254 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
255 snd_timer_check_slave(timeri);
256 mutex_unlock(®ister_mutex);
257 *ti = timeri;
258 return 0;
259 }
260
261 /* open a master instance */
262 mutex_lock(®ister_mutex);
263 timer = snd_timer_find(tid);
264#ifdef CONFIG_MODULES
265 if (!timer) {
266 mutex_unlock(®ister_mutex);
267 snd_timer_request(tid);
268 mutex_lock(®ister_mutex);
269 timer = snd_timer_find(tid);
270 }
271#endif
272 if (!timer) {
273 mutex_unlock(®ister_mutex);
274 return -ENODEV;
275 }
276 if (!list_empty(&timer->open_list_head)) {
277 timeri = list_entry(timer->open_list_head.next,
278 struct snd_timer_instance, open_list);
279 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
280 mutex_unlock(®ister_mutex);
281 return -EBUSY;
282 }
283 }
284 timeri = snd_timer_instance_new(owner, timer);
285 if (!timeri) {
286 mutex_unlock(®ister_mutex);
287 return -ENOMEM;
288 }
289 timeri->slave_class = tid->dev_sclass;
290 timeri->slave_id = slave_id;
291 if (list_empty(&timer->open_list_head) && timer->hw.open)
292 timer->hw.open(timer);
293 list_add_tail(&timeri->open_list, &timer->open_list_head);
294 snd_timer_check_master(timeri);
295 mutex_unlock(®ister_mutex);
296 *ti = timeri;
297 return 0;
298}
299
300static int _snd_timer_stop(struct snd_timer_instance *timeri,
301 int keep_flag, int event);
302
303/*
304 * close a timer instance
305 */
306int snd_timer_close(struct snd_timer_instance *timeri)
307{
308 struct snd_timer *timer = NULL;
309 struct snd_timer_instance *slave, *tmp;
310
311 if (snd_BUG_ON(!timeri))
312 return -ENXIO;
313
314 /* force to stop the timer */
315 snd_timer_stop(timeri);
316
317 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
318 /* wait, until the active callback is finished */
319 spin_lock_irq(&slave_active_lock);
320 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
321 spin_unlock_irq(&slave_active_lock);
322 udelay(10);
323 spin_lock_irq(&slave_active_lock);
324 }
325 spin_unlock_irq(&slave_active_lock);
326 mutex_lock(®ister_mutex);
327 list_del(&timeri->open_list);
328 mutex_unlock(®ister_mutex);
329 } else {
330 timer = timeri->timer;
331 if (snd_BUG_ON(!timer))
332 goto out;
333 /* wait, until the active callback is finished */
334 spin_lock_irq(&timer->lock);
335 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
336 spin_unlock_irq(&timer->lock);
337 udelay(10);
338 spin_lock_irq(&timer->lock);
339 }
340 spin_unlock_irq(&timer->lock);
341 mutex_lock(®ister_mutex);
342 list_del(&timeri->open_list);
343 if (timer && list_empty(&timer->open_list_head) &&
344 timer->hw.close)
345 timer->hw.close(timer);
346 /* remove slave links */
347 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
348 open_list) {
349 spin_lock_irq(&slave_active_lock);
350 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
351 list_move_tail(&slave->open_list, &snd_timer_slave_list);
352 slave->master = NULL;
353 slave->timer = NULL;
354 spin_unlock_irq(&slave_active_lock);
355 }
356 mutex_unlock(®ister_mutex);
357 }
358 out:
359 if (timeri->private_free)
360 timeri->private_free(timeri);
361 kfree(timeri->owner);
362 kfree(timeri);
363 if (timer)
364 module_put(timer->module);
365 return 0;
366}
367
368unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
369{
370 struct snd_timer * timer;
371
372 if (timeri == NULL)
373 return 0;
374 if ((timer = timeri->timer) != NULL) {
375 if (timer->hw.c_resolution)
376 return timer->hw.c_resolution(timer);
377 return timer->hw.resolution;
378 }
379 return 0;
380}
381
382static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
383{
384 struct snd_timer *timer;
385 unsigned long flags;
386 unsigned long resolution = 0;
387 struct snd_timer_instance *ts;
388 struct timespec tstamp;
389
390 if (timer_tstamp_monotonic)
391 do_posix_clock_monotonic_gettime(&tstamp);
392 else
393 getnstimeofday(&tstamp);
394 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
395 event > SNDRV_TIMER_EVENT_PAUSE))
396 return;
397 if (event == SNDRV_TIMER_EVENT_START ||
398 event == SNDRV_TIMER_EVENT_CONTINUE)
399 resolution = snd_timer_resolution(ti);
400 if (ti->ccallback)
401 ti->ccallback(ti, event, &tstamp, resolution);
402 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
403 return;
404 timer = ti->timer;
405 if (timer == NULL)
406 return;
407 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
408 return;
409 spin_lock_irqsave(&timer->lock, flags);
410 list_for_each_entry(ts, &ti->slave_active_head, active_list)
411 if (ts->ccallback)
412 ts->ccallback(ti, event + 100, &tstamp, resolution);
413 spin_unlock_irqrestore(&timer->lock, flags);
414}
415
416static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
417 unsigned long sticks)
418{
419 list_move_tail(&timeri->active_list, &timer->active_list_head);
420 if (timer->running) {
421 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
422 goto __start_now;
423 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
424 timeri->flags |= SNDRV_TIMER_IFLG_START;
425 return 1; /* delayed start */
426 } else {
427 timer->sticks = sticks;
428 timer->hw.start(timer);
429 __start_now:
430 timer->running++;
431 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
432 return 0;
433 }
434}
435
436static int snd_timer_start_slave(struct snd_timer_instance *timeri)
437{
438 unsigned long flags;
439
440 spin_lock_irqsave(&slave_active_lock, flags);
441 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
442 if (timeri->master)
443 list_add_tail(&timeri->active_list,
444 &timeri->master->slave_active_head);
445 spin_unlock_irqrestore(&slave_active_lock, flags);
446 return 1; /* delayed start */
447}
448
449/*
450 * start the timer instance
451 */
452int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
453{
454 struct snd_timer *timer;
455 int result = -EINVAL;
456 unsigned long flags;
457
458 if (timeri == NULL || ticks < 1)
459 return -EINVAL;
460 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
461 result = snd_timer_start_slave(timeri);
462 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
463 return result;
464 }
465 timer = timeri->timer;
466 if (timer == NULL)
467 return -EINVAL;
468 spin_lock_irqsave(&timer->lock, flags);
469 timeri->ticks = timeri->cticks = ticks;
470 timeri->pticks = 0;
471 result = snd_timer_start1(timer, timeri, ticks);
472 spin_unlock_irqrestore(&timer->lock, flags);
473 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
474 return result;
475}
476
477static int _snd_timer_stop(struct snd_timer_instance * timeri,
478 int keep_flag, int event)
479{
480 struct snd_timer *timer;
481 unsigned long flags;
482
483 if (snd_BUG_ON(!timeri))
484 return -ENXIO;
485
486 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
487 if (!keep_flag) {
488 spin_lock_irqsave(&slave_active_lock, flags);
489 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
490 spin_unlock_irqrestore(&slave_active_lock, flags);
491 }
492 goto __end;
493 }
494 timer = timeri->timer;
495 if (!timer)
496 return -EINVAL;
497 spin_lock_irqsave(&timer->lock, flags);
498 list_del_init(&timeri->ack_list);
499 list_del_init(&timeri->active_list);
500 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
501 !(--timer->running)) {
502 timer->hw.stop(timer);
503 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
504 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
505 snd_timer_reschedule(timer, 0);
506 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
507 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
508 timer->hw.start(timer);
509 }
510 }
511 }
512 if (!keep_flag)
513 timeri->flags &=
514 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
515 spin_unlock_irqrestore(&timer->lock, flags);
516 __end:
517 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
518 snd_timer_notify1(timeri, event);
519 return 0;
520}
521
522/*
523 * stop the timer instance.
524 *
525 * do not call this from the timer callback!
526 */
527int snd_timer_stop(struct snd_timer_instance *timeri)
528{
529 struct snd_timer *timer;
530 unsigned long flags;
531 int err;
532
533 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
534 if (err < 0)
535 return err;
536 timer = timeri->timer;
537 if (!timer)
538 return -EINVAL;
539 spin_lock_irqsave(&timer->lock, flags);
540 timeri->cticks = timeri->ticks;
541 timeri->pticks = 0;
542 spin_unlock_irqrestore(&timer->lock, flags);
543 return 0;
544}
545
546/*
547 * start again.. the tick is kept.
548 */
549int snd_timer_continue(struct snd_timer_instance *timeri)
550{
551 struct snd_timer *timer;
552 int result = -EINVAL;
553 unsigned long flags;
554
555 if (timeri == NULL)
556 return result;
557 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
558 return snd_timer_start_slave(timeri);
559 timer = timeri->timer;
560 if (! timer)
561 return -EINVAL;
562 spin_lock_irqsave(&timer->lock, flags);
563 if (!timeri->cticks)
564 timeri->cticks = 1;
565 timeri->pticks = 0;
566 result = snd_timer_start1(timer, timeri, timer->sticks);
567 spin_unlock_irqrestore(&timer->lock, flags);
568 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
569 return result;
570}
571
572/*
573 * pause.. remember the ticks left
574 */
575int snd_timer_pause(struct snd_timer_instance * timeri)
576{
577 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
578}
579
580/*
581 * reschedule the timer
582 *
583 * start pending instances and check the scheduling ticks.
584 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
585 */
586static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
587{
588 struct snd_timer_instance *ti;
589 unsigned long ticks = ~0UL;
590
591 list_for_each_entry(ti, &timer->active_list_head, active_list) {
592 if (ti->flags & SNDRV_TIMER_IFLG_START) {
593 ti->flags &= ~SNDRV_TIMER_IFLG_START;
594 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
595 timer->running++;
596 }
597 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
598 if (ticks > ti->cticks)
599 ticks = ti->cticks;
600 }
601 }
602 if (ticks == ~0UL) {
603 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
604 return;
605 }
606 if (ticks > timer->hw.ticks)
607 ticks = timer->hw.ticks;
608 if (ticks_left != ticks)
609 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
610 timer->sticks = ticks;
611}
612
613/*
614 * timer tasklet
615 *
616 */
617static void snd_timer_tasklet(unsigned long arg)
618{
619 struct snd_timer *timer = (struct snd_timer *) arg;
620 struct snd_timer_instance *ti;
621 struct list_head *p;
622 unsigned long resolution, ticks;
623 unsigned long flags;
624
625 spin_lock_irqsave(&timer->lock, flags);
626 /* now process all callbacks */
627 while (!list_empty(&timer->sack_list_head)) {
628 p = timer->sack_list_head.next; /* get first item */
629 ti = list_entry(p, struct snd_timer_instance, ack_list);
630
631 /* remove from ack_list and make empty */
632 list_del_init(p);
633
634 ticks = ti->pticks;
635 ti->pticks = 0;
636 resolution = ti->resolution;
637
638 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
639 spin_unlock(&timer->lock);
640 if (ti->callback)
641 ti->callback(ti, resolution, ticks);
642 spin_lock(&timer->lock);
643 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
644 }
645 spin_unlock_irqrestore(&timer->lock, flags);
646}
647
648/*
649 * timer interrupt
650 *
651 * ticks_left is usually equal to timer->sticks.
652 *
653 */
654void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
655{
656 struct snd_timer_instance *ti, *ts, *tmp;
657 unsigned long resolution, ticks;
658 struct list_head *p, *ack_list_head;
659 unsigned long flags;
660 int use_tasklet = 0;
661
662 if (timer == NULL)
663 return;
664
665 spin_lock_irqsave(&timer->lock, flags);
666
667 /* remember the current resolution */
668 if (timer->hw.c_resolution)
669 resolution = timer->hw.c_resolution(timer);
670 else
671 resolution = timer->hw.resolution;
672
673 /* loop for all active instances
674 * Here we cannot use list_for_each_entry because the active_list of a
675 * processed instance is relinked to done_list_head before the callback
676 * is called.
677 */
678 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
679 active_list) {
680 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
681 continue;
682 ti->pticks += ticks_left;
683 ti->resolution = resolution;
684 if (ti->cticks < ticks_left)
685 ti->cticks = 0;
686 else
687 ti->cticks -= ticks_left;
688 if (ti->cticks) /* not expired */
689 continue;
690 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
691 ti->cticks = ti->ticks;
692 } else {
693 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
694 if (--timer->running)
695 list_del(&ti->active_list);
696 }
697 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
698 (ti->flags & SNDRV_TIMER_IFLG_FAST))
699 ack_list_head = &timer->ack_list_head;
700 else
701 ack_list_head = &timer->sack_list_head;
702 if (list_empty(&ti->ack_list))
703 list_add_tail(&ti->ack_list, ack_list_head);
704 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
705 ts->pticks = ti->pticks;
706 ts->resolution = resolution;
707 if (list_empty(&ts->ack_list))
708 list_add_tail(&ts->ack_list, ack_list_head);
709 }
710 }
711 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
712 snd_timer_reschedule(timer, timer->sticks);
713 if (timer->running) {
714 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
715 timer->hw.stop(timer);
716 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
717 }
718 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
719 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
720 /* restart timer */
721 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
722 timer->hw.start(timer);
723 }
724 } else {
725 timer->hw.stop(timer);
726 }
727
728 /* now process all fast callbacks */
729 while (!list_empty(&timer->ack_list_head)) {
730 p = timer->ack_list_head.next; /* get first item */
731 ti = list_entry(p, struct snd_timer_instance, ack_list);
732
733 /* remove from ack_list and make empty */
734 list_del_init(p);
735
736 ticks = ti->pticks;
737 ti->pticks = 0;
738
739 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
740 spin_unlock(&timer->lock);
741 if (ti->callback)
742 ti->callback(ti, resolution, ticks);
743 spin_lock(&timer->lock);
744 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
745 }
746
747 /* do we have any slow callbacks? */
748 use_tasklet = !list_empty(&timer->sack_list_head);
749 spin_unlock_irqrestore(&timer->lock, flags);
750
751 if (use_tasklet)
752 tasklet_schedule(&timer->task_queue);
753}
754
755/*
756
757 */
758
759int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
760 struct snd_timer **rtimer)
761{
762 struct snd_timer *timer;
763 int err;
764 static struct snd_device_ops ops = {
765 .dev_free = snd_timer_dev_free,
766 .dev_register = snd_timer_dev_register,
767 .dev_disconnect = snd_timer_dev_disconnect,
768 };
769
770 if (snd_BUG_ON(!tid))
771 return -EINVAL;
772 if (rtimer)
773 *rtimer = NULL;
774 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
775 if (timer == NULL) {
776 snd_printk(KERN_ERR "timer: cannot allocate\n");
777 return -ENOMEM;
778 }
779 timer->tmr_class = tid->dev_class;
780 timer->card = card;
781 timer->tmr_device = tid->device;
782 timer->tmr_subdevice = tid->subdevice;
783 if (id)
784 strlcpy(timer->id, id, sizeof(timer->id));
785 INIT_LIST_HEAD(&timer->device_list);
786 INIT_LIST_HEAD(&timer->open_list_head);
787 INIT_LIST_HEAD(&timer->active_list_head);
788 INIT_LIST_HEAD(&timer->ack_list_head);
789 INIT_LIST_HEAD(&timer->sack_list_head);
790 spin_lock_init(&timer->lock);
791 tasklet_init(&timer->task_queue, snd_timer_tasklet,
792 (unsigned long)timer);
793 if (card != NULL) {
794 timer->module = card->module;
795 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
796 if (err < 0) {
797 snd_timer_free(timer);
798 return err;
799 }
800 }
801 if (rtimer)
802 *rtimer = timer;
803 return 0;
804}
805
806static int snd_timer_free(struct snd_timer *timer)
807{
808 if (!timer)
809 return 0;
810
811 mutex_lock(®ister_mutex);
812 if (! list_empty(&timer->open_list_head)) {
813 struct list_head *p, *n;
814 struct snd_timer_instance *ti;
815 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
816 list_for_each_safe(p, n, &timer->open_list_head) {
817 list_del_init(p);
818 ti = list_entry(p, struct snd_timer_instance, open_list);
819 ti->timer = NULL;
820 }
821 }
822 list_del(&timer->device_list);
823 mutex_unlock(®ister_mutex);
824
825 if (timer->private_free)
826 timer->private_free(timer);
827 kfree(timer);
828 return 0;
829}
830
831static int snd_timer_dev_free(struct snd_device *device)
832{
833 struct snd_timer *timer = device->device_data;
834 return snd_timer_free(timer);
835}
836
837static int snd_timer_dev_register(struct snd_device *dev)
838{
839 struct snd_timer *timer = dev->device_data;
840 struct snd_timer *timer1;
841
842 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
843 return -ENXIO;
844 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
845 !timer->hw.resolution && timer->hw.c_resolution == NULL)
846 return -EINVAL;
847
848 mutex_lock(®ister_mutex);
849 list_for_each_entry(timer1, &snd_timer_list, device_list) {
850 if (timer1->tmr_class > timer->tmr_class)
851 break;
852 if (timer1->tmr_class < timer->tmr_class)
853 continue;
854 if (timer1->card && timer->card) {
855 if (timer1->card->number > timer->card->number)
856 break;
857 if (timer1->card->number < timer->card->number)
858 continue;
859 }
860 if (timer1->tmr_device > timer->tmr_device)
861 break;
862 if (timer1->tmr_device < timer->tmr_device)
863 continue;
864 if (timer1->tmr_subdevice > timer->tmr_subdevice)
865 break;
866 if (timer1->tmr_subdevice < timer->tmr_subdevice)
867 continue;
868 /* conflicts.. */
869 mutex_unlock(®ister_mutex);
870 return -EBUSY;
871 }
872 list_add_tail(&timer->device_list, &timer1->device_list);
873 mutex_unlock(®ister_mutex);
874 return 0;
875}
876
877static int snd_timer_dev_disconnect(struct snd_device *device)
878{
879 struct snd_timer *timer = device->device_data;
880 mutex_lock(®ister_mutex);
881 list_del_init(&timer->device_list);
882 mutex_unlock(®ister_mutex);
883 return 0;
884}
885
886void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
887{
888 unsigned long flags;
889 unsigned long resolution = 0;
890 struct snd_timer_instance *ti, *ts;
891
892 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
893 return;
894 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
895 event > SNDRV_TIMER_EVENT_MRESUME))
896 return;
897 spin_lock_irqsave(&timer->lock, flags);
898 if (event == SNDRV_TIMER_EVENT_MSTART ||
899 event == SNDRV_TIMER_EVENT_MCONTINUE ||
900 event == SNDRV_TIMER_EVENT_MRESUME) {
901 if (timer->hw.c_resolution)
902 resolution = timer->hw.c_resolution(timer);
903 else
904 resolution = timer->hw.resolution;
905 }
906 list_for_each_entry(ti, &timer->active_list_head, active_list) {
907 if (ti->ccallback)
908 ti->ccallback(ti, event, tstamp, resolution);
909 list_for_each_entry(ts, &ti->slave_active_head, active_list)
910 if (ts->ccallback)
911 ts->ccallback(ts, event, tstamp, resolution);
912 }
913 spin_unlock_irqrestore(&timer->lock, flags);
914}
915
916/*
917 * exported functions for global timers
918 */
919int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
920{
921 struct snd_timer_id tid;
922
923 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
924 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
925 tid.card = -1;
926 tid.device = device;
927 tid.subdevice = 0;
928 return snd_timer_new(NULL, id, &tid, rtimer);
929}
930
931int snd_timer_global_free(struct snd_timer *timer)
932{
933 return snd_timer_free(timer);
934}
935
936int snd_timer_global_register(struct snd_timer *timer)
937{
938 struct snd_device dev;
939
940 memset(&dev, 0, sizeof(dev));
941 dev.device_data = timer;
942 return snd_timer_dev_register(&dev);
943}
944
945/*
946 * System timer
947 */
948
949struct snd_timer_system_private {
950 struct timer_list tlist;
951 unsigned long last_expires;
952 unsigned long last_jiffies;
953 unsigned long correction;
954};
955
956static void snd_timer_s_function(unsigned long data)
957{
958 struct snd_timer *timer = (struct snd_timer *)data;
959 struct snd_timer_system_private *priv = timer->private_data;
960 unsigned long jiff = jiffies;
961 if (time_after(jiff, priv->last_expires))
962 priv->correction += (long)jiff - (long)priv->last_expires;
963 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
964}
965
966static int snd_timer_s_start(struct snd_timer * timer)
967{
968 struct snd_timer_system_private *priv;
969 unsigned long njiff;
970
971 priv = (struct snd_timer_system_private *) timer->private_data;
972 njiff = (priv->last_jiffies = jiffies);
973 if (priv->correction > timer->sticks - 1) {
974 priv->correction -= timer->sticks - 1;
975 njiff++;
976 } else {
977 njiff += timer->sticks - priv->correction;
978 priv->correction = 0;
979 }
980 priv->last_expires = priv->tlist.expires = njiff;
981 add_timer(&priv->tlist);
982 return 0;
983}
984
985static int snd_timer_s_stop(struct snd_timer * timer)
986{
987 struct snd_timer_system_private *priv;
988 unsigned long jiff;
989
990 priv = (struct snd_timer_system_private *) timer->private_data;
991 del_timer(&priv->tlist);
992 jiff = jiffies;
993 if (time_before(jiff, priv->last_expires))
994 timer->sticks = priv->last_expires - jiff;
995 else
996 timer->sticks = 1;
997 priv->correction = 0;
998 return 0;
999}
1000
1001static struct snd_timer_hardware snd_timer_system =
1002{
1003 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1004 .resolution = 1000000000L / HZ,
1005 .ticks = 10000000L,
1006 .start = snd_timer_s_start,
1007 .stop = snd_timer_s_stop
1008};
1009
1010static void snd_timer_free_system(struct snd_timer *timer)
1011{
1012 kfree(timer->private_data);
1013}
1014
1015static int snd_timer_register_system(void)
1016{
1017 struct snd_timer *timer;
1018 struct snd_timer_system_private *priv;
1019 int err;
1020
1021 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1022 if (err < 0)
1023 return err;
1024 strcpy(timer->name, "system timer");
1025 timer->hw = snd_timer_system;
1026 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1027 if (priv == NULL) {
1028 snd_timer_free(timer);
1029 return -ENOMEM;
1030 }
1031 init_timer(&priv->tlist);
1032 priv->tlist.function = snd_timer_s_function;
1033 priv->tlist.data = (unsigned long) timer;
1034 timer->private_data = priv;
1035 timer->private_free = snd_timer_free_system;
1036 return snd_timer_global_register(timer);
1037}
1038
1039#ifdef CONFIG_PROC_FS
1040/*
1041 * Info interface
1042 */
1043
1044static void snd_timer_proc_read(struct snd_info_entry *entry,
1045 struct snd_info_buffer *buffer)
1046{
1047 struct snd_timer *timer;
1048 struct snd_timer_instance *ti;
1049
1050 mutex_lock(®ister_mutex);
1051 list_for_each_entry(timer, &snd_timer_list, device_list) {
1052 switch (timer->tmr_class) {
1053 case SNDRV_TIMER_CLASS_GLOBAL:
1054 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1055 break;
1056 case SNDRV_TIMER_CLASS_CARD:
1057 snd_iprintf(buffer, "C%i-%i: ",
1058 timer->card->number, timer->tmr_device);
1059 break;
1060 case SNDRV_TIMER_CLASS_PCM:
1061 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1062 timer->tmr_device, timer->tmr_subdevice);
1063 break;
1064 default:
1065 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1066 timer->card ? timer->card->number : -1,
1067 timer->tmr_device, timer->tmr_subdevice);
1068 }
1069 snd_iprintf(buffer, "%s :", timer->name);
1070 if (timer->hw.resolution)
1071 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1072 timer->hw.resolution / 1000,
1073 timer->hw.resolution % 1000,
1074 timer->hw.ticks);
1075 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1076 snd_iprintf(buffer, " SLAVE");
1077 snd_iprintf(buffer, "\n");
1078 list_for_each_entry(ti, &timer->open_list_head, open_list)
1079 snd_iprintf(buffer, " Client %s : %s\n",
1080 ti->owner ? ti->owner : "unknown",
1081 ti->flags & (SNDRV_TIMER_IFLG_START |
1082 SNDRV_TIMER_IFLG_RUNNING)
1083 ? "running" : "stopped");
1084 }
1085 mutex_unlock(®ister_mutex);
1086}
1087
1088static struct snd_info_entry *snd_timer_proc_entry;
1089
1090static void __init snd_timer_proc_init(void)
1091{
1092 struct snd_info_entry *entry;
1093
1094 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1095 if (entry != NULL) {
1096 entry->c.text.read = snd_timer_proc_read;
1097 if (snd_info_register(entry) < 0) {
1098 snd_info_free_entry(entry);
1099 entry = NULL;
1100 }
1101 }
1102 snd_timer_proc_entry = entry;
1103}
1104
1105static void __exit snd_timer_proc_done(void)
1106{
1107 snd_info_free_entry(snd_timer_proc_entry);
1108}
1109#else /* !CONFIG_PROC_FS */
1110#define snd_timer_proc_init()
1111#define snd_timer_proc_done()
1112#endif
1113
1114/*
1115 * USER SPACE interface
1116 */
1117
1118static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1119 unsigned long resolution,
1120 unsigned long ticks)
1121{
1122 struct snd_timer_user *tu = timeri->callback_data;
1123 struct snd_timer_read *r;
1124 int prev;
1125
1126 spin_lock(&tu->qlock);
1127 if (tu->qused > 0) {
1128 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1129 r = &tu->queue[prev];
1130 if (r->resolution == resolution) {
1131 r->ticks += ticks;
1132 goto __wake;
1133 }
1134 }
1135 if (tu->qused >= tu->queue_size) {
1136 tu->overrun++;
1137 } else {
1138 r = &tu->queue[tu->qtail++];
1139 tu->qtail %= tu->queue_size;
1140 r->resolution = resolution;
1141 r->ticks = ticks;
1142 tu->qused++;
1143 }
1144 __wake:
1145 spin_unlock(&tu->qlock);
1146 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1147 wake_up(&tu->qchange_sleep);
1148}
1149
1150static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1151 struct snd_timer_tread *tread)
1152{
1153 if (tu->qused >= tu->queue_size) {
1154 tu->overrun++;
1155 } else {
1156 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1157 tu->qtail %= tu->queue_size;
1158 tu->qused++;
1159 }
1160}
1161
1162static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1163 int event,
1164 struct timespec *tstamp,
1165 unsigned long resolution)
1166{
1167 struct snd_timer_user *tu = timeri->callback_data;
1168 struct snd_timer_tread r1;
1169 unsigned long flags;
1170
1171 if (event >= SNDRV_TIMER_EVENT_START &&
1172 event <= SNDRV_TIMER_EVENT_PAUSE)
1173 tu->tstamp = *tstamp;
1174 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1175 return;
1176 r1.event = event;
1177 r1.tstamp = *tstamp;
1178 r1.val = resolution;
1179 spin_lock_irqsave(&tu->qlock, flags);
1180 snd_timer_user_append_to_tqueue(tu, &r1);
1181 spin_unlock_irqrestore(&tu->qlock, flags);
1182 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1183 wake_up(&tu->qchange_sleep);
1184}
1185
1186static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1187 unsigned long resolution,
1188 unsigned long ticks)
1189{
1190 struct snd_timer_user *tu = timeri->callback_data;
1191 struct snd_timer_tread *r, r1;
1192 struct timespec tstamp;
1193 int prev, append = 0;
1194
1195 memset(&tstamp, 0, sizeof(tstamp));
1196 spin_lock(&tu->qlock);
1197 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1198 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1199 spin_unlock(&tu->qlock);
1200 return;
1201 }
1202 if (tu->last_resolution != resolution || ticks > 0) {
1203 if (timer_tstamp_monotonic)
1204 do_posix_clock_monotonic_gettime(&tstamp);
1205 else
1206 getnstimeofday(&tstamp);
1207 }
1208 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1209 tu->last_resolution != resolution) {
1210 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1211 r1.tstamp = tstamp;
1212 r1.val = resolution;
1213 snd_timer_user_append_to_tqueue(tu, &r1);
1214 tu->last_resolution = resolution;
1215 append++;
1216 }
1217 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1218 goto __wake;
1219 if (ticks == 0)
1220 goto __wake;
1221 if (tu->qused > 0) {
1222 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1223 r = &tu->tqueue[prev];
1224 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1225 r->tstamp = tstamp;
1226 r->val += ticks;
1227 append++;
1228 goto __wake;
1229 }
1230 }
1231 r1.event = SNDRV_TIMER_EVENT_TICK;
1232 r1.tstamp = tstamp;
1233 r1.val = ticks;
1234 snd_timer_user_append_to_tqueue(tu, &r1);
1235 append++;
1236 __wake:
1237 spin_unlock(&tu->qlock);
1238 if (append == 0)
1239 return;
1240 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1241 wake_up(&tu->qchange_sleep);
1242}
1243
1244static int snd_timer_user_open(struct inode *inode, struct file *file)
1245{
1246 struct snd_timer_user *tu;
1247 int err;
1248
1249 err = nonseekable_open(inode, file);
1250 if (err < 0)
1251 return err;
1252
1253 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1254 if (tu == NULL)
1255 return -ENOMEM;
1256 spin_lock_init(&tu->qlock);
1257 init_waitqueue_head(&tu->qchange_sleep);
1258 mutex_init(&tu->tread_sem);
1259 tu->ticks = 1;
1260 tu->queue_size = 128;
1261 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1262 GFP_KERNEL);
1263 if (tu->queue == NULL) {
1264 kfree(tu);
1265 return -ENOMEM;
1266 }
1267 file->private_data = tu;
1268 return 0;
1269}
1270
1271static int snd_timer_user_release(struct inode *inode, struct file *file)
1272{
1273 struct snd_timer_user *tu;
1274
1275 if (file->private_data) {
1276 tu = file->private_data;
1277 file->private_data = NULL;
1278 if (tu->timeri)
1279 snd_timer_close(tu->timeri);
1280 kfree(tu->queue);
1281 kfree(tu->tqueue);
1282 kfree(tu);
1283 }
1284 return 0;
1285}
1286
1287static void snd_timer_user_zero_id(struct snd_timer_id *id)
1288{
1289 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1290 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1291 id->card = -1;
1292 id->device = -1;
1293 id->subdevice = -1;
1294}
1295
1296static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1297{
1298 id->dev_class = timer->tmr_class;
1299 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1300 id->card = timer->card ? timer->card->number : -1;
1301 id->device = timer->tmr_device;
1302 id->subdevice = timer->tmr_subdevice;
1303}
1304
1305static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1306{
1307 struct snd_timer_id id;
1308 struct snd_timer *timer;
1309 struct list_head *p;
1310
1311 if (copy_from_user(&id, _tid, sizeof(id)))
1312 return -EFAULT;
1313 mutex_lock(®ister_mutex);
1314 if (id.dev_class < 0) { /* first item */
1315 if (list_empty(&snd_timer_list))
1316 snd_timer_user_zero_id(&id);
1317 else {
1318 timer = list_entry(snd_timer_list.next,
1319 struct snd_timer, device_list);
1320 snd_timer_user_copy_id(&id, timer);
1321 }
1322 } else {
1323 switch (id.dev_class) {
1324 case SNDRV_TIMER_CLASS_GLOBAL:
1325 id.device = id.device < 0 ? 0 : id.device + 1;
1326 list_for_each(p, &snd_timer_list) {
1327 timer = list_entry(p, struct snd_timer, device_list);
1328 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1329 snd_timer_user_copy_id(&id, timer);
1330 break;
1331 }
1332 if (timer->tmr_device >= id.device) {
1333 snd_timer_user_copy_id(&id, timer);
1334 break;
1335 }
1336 }
1337 if (p == &snd_timer_list)
1338 snd_timer_user_zero_id(&id);
1339 break;
1340 case SNDRV_TIMER_CLASS_CARD:
1341 case SNDRV_TIMER_CLASS_PCM:
1342 if (id.card < 0) {
1343 id.card = 0;
1344 } else {
1345 if (id.card < 0) {
1346 id.card = 0;
1347 } else {
1348 if (id.device < 0) {
1349 id.device = 0;
1350 } else {
1351 if (id.subdevice < 0) {
1352 id.subdevice = 0;
1353 } else {
1354 id.subdevice++;
1355 }
1356 }
1357 }
1358 }
1359 list_for_each(p, &snd_timer_list) {
1360 timer = list_entry(p, struct snd_timer, device_list);
1361 if (timer->tmr_class > id.dev_class) {
1362 snd_timer_user_copy_id(&id, timer);
1363 break;
1364 }
1365 if (timer->tmr_class < id.dev_class)
1366 continue;
1367 if (timer->card->number > id.card) {
1368 snd_timer_user_copy_id(&id, timer);
1369 break;
1370 }
1371 if (timer->card->number < id.card)
1372 continue;
1373 if (timer->tmr_device > id.device) {
1374 snd_timer_user_copy_id(&id, timer);
1375 break;
1376 }
1377 if (timer->tmr_device < id.device)
1378 continue;
1379 if (timer->tmr_subdevice > id.subdevice) {
1380 snd_timer_user_copy_id(&id, timer);
1381 break;
1382 }
1383 if (timer->tmr_subdevice < id.subdevice)
1384 continue;
1385 snd_timer_user_copy_id(&id, timer);
1386 break;
1387 }
1388 if (p == &snd_timer_list)
1389 snd_timer_user_zero_id(&id);
1390 break;
1391 default:
1392 snd_timer_user_zero_id(&id);
1393 }
1394 }
1395 mutex_unlock(®ister_mutex);
1396 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1397 return -EFAULT;
1398 return 0;
1399}
1400
1401static int snd_timer_user_ginfo(struct file *file,
1402 struct snd_timer_ginfo __user *_ginfo)
1403{
1404 struct snd_timer_ginfo *ginfo;
1405 struct snd_timer_id tid;
1406 struct snd_timer *t;
1407 struct list_head *p;
1408 int err = 0;
1409
1410 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1411 if (IS_ERR(ginfo))
1412 return PTR_ERR(ginfo);
1413
1414 tid = ginfo->tid;
1415 memset(ginfo, 0, sizeof(*ginfo));
1416 ginfo->tid = tid;
1417 mutex_lock(®ister_mutex);
1418 t = snd_timer_find(&tid);
1419 if (t != NULL) {
1420 ginfo->card = t->card ? t->card->number : -1;
1421 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1422 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1423 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1424 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1425 ginfo->resolution = t->hw.resolution;
1426 if (t->hw.resolution_min > 0) {
1427 ginfo->resolution_min = t->hw.resolution_min;
1428 ginfo->resolution_max = t->hw.resolution_max;
1429 }
1430 list_for_each(p, &t->open_list_head) {
1431 ginfo->clients++;
1432 }
1433 } else {
1434 err = -ENODEV;
1435 }
1436 mutex_unlock(®ister_mutex);
1437 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1438 err = -EFAULT;
1439 kfree(ginfo);
1440 return err;
1441}
1442
1443static int snd_timer_user_gparams(struct file *file,
1444 struct snd_timer_gparams __user *_gparams)
1445{
1446 struct snd_timer_gparams gparams;
1447 struct snd_timer *t;
1448 int err;
1449
1450 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1451 return -EFAULT;
1452 mutex_lock(®ister_mutex);
1453 t = snd_timer_find(&gparams.tid);
1454 if (!t) {
1455 err = -ENODEV;
1456 goto _error;
1457 }
1458 if (!list_empty(&t->open_list_head)) {
1459 err = -EBUSY;
1460 goto _error;
1461 }
1462 if (!t->hw.set_period) {
1463 err = -ENOSYS;
1464 goto _error;
1465 }
1466 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1467_error:
1468 mutex_unlock(®ister_mutex);
1469 return err;
1470}
1471
1472static int snd_timer_user_gstatus(struct file *file,
1473 struct snd_timer_gstatus __user *_gstatus)
1474{
1475 struct snd_timer_gstatus gstatus;
1476 struct snd_timer_id tid;
1477 struct snd_timer *t;
1478 int err = 0;
1479
1480 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1481 return -EFAULT;
1482 tid = gstatus.tid;
1483 memset(&gstatus, 0, sizeof(gstatus));
1484 gstatus.tid = tid;
1485 mutex_lock(®ister_mutex);
1486 t = snd_timer_find(&tid);
1487 if (t != NULL) {
1488 if (t->hw.c_resolution)
1489 gstatus.resolution = t->hw.c_resolution(t);
1490 else
1491 gstatus.resolution = t->hw.resolution;
1492 if (t->hw.precise_resolution) {
1493 t->hw.precise_resolution(t, &gstatus.resolution_num,
1494 &gstatus.resolution_den);
1495 } else {
1496 gstatus.resolution_num = gstatus.resolution;
1497 gstatus.resolution_den = 1000000000uL;
1498 }
1499 } else {
1500 err = -ENODEV;
1501 }
1502 mutex_unlock(®ister_mutex);
1503 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1504 err = -EFAULT;
1505 return err;
1506}
1507
1508static int snd_timer_user_tselect(struct file *file,
1509 struct snd_timer_select __user *_tselect)
1510{
1511 struct snd_timer_user *tu;
1512 struct snd_timer_select tselect;
1513 char str[32];
1514 int err = 0;
1515
1516 tu = file->private_data;
1517 mutex_lock(&tu->tread_sem);
1518 if (tu->timeri) {
1519 snd_timer_close(tu->timeri);
1520 tu->timeri = NULL;
1521 }
1522 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1523 err = -EFAULT;
1524 goto __err;
1525 }
1526 sprintf(str, "application %i", current->pid);
1527 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1528 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1529 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1530 if (err < 0)
1531 goto __err;
1532
1533 kfree(tu->queue);
1534 tu->queue = NULL;
1535 kfree(tu->tqueue);
1536 tu->tqueue = NULL;
1537 if (tu->tread) {
1538 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1539 GFP_KERNEL);
1540 if (tu->tqueue == NULL)
1541 err = -ENOMEM;
1542 } else {
1543 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1544 GFP_KERNEL);
1545 if (tu->queue == NULL)
1546 err = -ENOMEM;
1547 }
1548
1549 if (err < 0) {
1550 snd_timer_close(tu->timeri);
1551 tu->timeri = NULL;
1552 } else {
1553 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1554 tu->timeri->callback = tu->tread
1555 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1556 tu->timeri->ccallback = snd_timer_user_ccallback;
1557 tu->timeri->callback_data = (void *)tu;
1558 }
1559
1560 __err:
1561 mutex_unlock(&tu->tread_sem);
1562 return err;
1563}
1564
1565static int snd_timer_user_info(struct file *file,
1566 struct snd_timer_info __user *_info)
1567{
1568 struct snd_timer_user *tu;
1569 struct snd_timer_info *info;
1570 struct snd_timer *t;
1571 int err = 0;
1572
1573 tu = file->private_data;
1574 if (!tu->timeri)
1575 return -EBADFD;
1576 t = tu->timeri->timer;
1577 if (!t)
1578 return -EBADFD;
1579
1580 info = kzalloc(sizeof(*info), GFP_KERNEL);
1581 if (! info)
1582 return -ENOMEM;
1583 info->card = t->card ? t->card->number : -1;
1584 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1585 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1586 strlcpy(info->id, t->id, sizeof(info->id));
1587 strlcpy(info->name, t->name, sizeof(info->name));
1588 info->resolution = t->hw.resolution;
1589 if (copy_to_user(_info, info, sizeof(*_info)))
1590 err = -EFAULT;
1591 kfree(info);
1592 return err;
1593}
1594
1595static int snd_timer_user_params(struct file *file,
1596 struct snd_timer_params __user *_params)
1597{
1598 struct snd_timer_user *tu;
1599 struct snd_timer_params params;
1600 struct snd_timer *t;
1601 struct snd_timer_read *tr;
1602 struct snd_timer_tread *ttr;
1603 int err;
1604
1605 tu = file->private_data;
1606 if (!tu->timeri)
1607 return -EBADFD;
1608 t = tu->timeri->timer;
1609 if (!t)
1610 return -EBADFD;
1611 if (copy_from_user(¶ms, _params, sizeof(params)))
1612 return -EFAULT;
1613 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1614 err = -EINVAL;
1615 goto _end;
1616 }
1617 if (params.queue_size > 0 &&
1618 (params.queue_size < 32 || params.queue_size > 1024)) {
1619 err = -EINVAL;
1620 goto _end;
1621 }
1622 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1623 (1<<SNDRV_TIMER_EVENT_TICK)|
1624 (1<<SNDRV_TIMER_EVENT_START)|
1625 (1<<SNDRV_TIMER_EVENT_STOP)|
1626 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1627 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1628 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1629 (1<<SNDRV_TIMER_EVENT_RESUME)|
1630 (1<<SNDRV_TIMER_EVENT_MSTART)|
1631 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1632 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1633 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1634 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1635 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1636 err = -EINVAL;
1637 goto _end;
1638 }
1639 snd_timer_stop(tu->timeri);
1640 spin_lock_irq(&t->lock);
1641 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1642 SNDRV_TIMER_IFLG_EXCLUSIVE|
1643 SNDRV_TIMER_IFLG_EARLY_EVENT);
1644 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1645 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1646 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1647 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1648 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1649 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1650 spin_unlock_irq(&t->lock);
1651 if (params.queue_size > 0 &&
1652 (unsigned int)tu->queue_size != params.queue_size) {
1653 if (tu->tread) {
1654 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1655 GFP_KERNEL);
1656 if (ttr) {
1657 kfree(tu->tqueue);
1658 tu->queue_size = params.queue_size;
1659 tu->tqueue = ttr;
1660 }
1661 } else {
1662 tr = kmalloc(params.queue_size * sizeof(*tr),
1663 GFP_KERNEL);
1664 if (tr) {
1665 kfree(tu->queue);
1666 tu->queue_size = params.queue_size;
1667 tu->queue = tr;
1668 }
1669 }
1670 }
1671 tu->qhead = tu->qtail = tu->qused = 0;
1672 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1673 if (tu->tread) {
1674 struct snd_timer_tread tread;
1675 tread.event = SNDRV_TIMER_EVENT_EARLY;
1676 tread.tstamp.tv_sec = 0;
1677 tread.tstamp.tv_nsec = 0;
1678 tread.val = 0;
1679 snd_timer_user_append_to_tqueue(tu, &tread);
1680 } else {
1681 struct snd_timer_read *r = &tu->queue[0];
1682 r->resolution = 0;
1683 r->ticks = 0;
1684 tu->qused++;
1685 tu->qtail++;
1686 }
1687 }
1688 tu->filter = params.filter;
1689 tu->ticks = params.ticks;
1690 err = 0;
1691 _end:
1692 if (copy_to_user(_params, ¶ms, sizeof(params)))
1693 return -EFAULT;
1694 return err;
1695}
1696
1697static int snd_timer_user_status(struct file *file,
1698 struct snd_timer_status __user *_status)
1699{
1700 struct snd_timer_user *tu;
1701 struct snd_timer_status status;
1702
1703 tu = file->private_data;
1704 if (!tu->timeri)
1705 return -EBADFD;
1706 memset(&status, 0, sizeof(status));
1707 status.tstamp = tu->tstamp;
1708 status.resolution = snd_timer_resolution(tu->timeri);
1709 status.lost = tu->timeri->lost;
1710 status.overrun = tu->overrun;
1711 spin_lock_irq(&tu->qlock);
1712 status.queue = tu->qused;
1713 spin_unlock_irq(&tu->qlock);
1714 if (copy_to_user(_status, &status, sizeof(status)))
1715 return -EFAULT;
1716 return 0;
1717}
1718
1719static int snd_timer_user_start(struct file *file)
1720{
1721 int err;
1722 struct snd_timer_user *tu;
1723
1724 tu = file->private_data;
1725 if (!tu->timeri)
1726 return -EBADFD;
1727 snd_timer_stop(tu->timeri);
1728 tu->timeri->lost = 0;
1729 tu->last_resolution = 0;
1730 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1731}
1732
1733static int snd_timer_user_stop(struct file *file)
1734{
1735 int err;
1736 struct snd_timer_user *tu;
1737
1738 tu = file->private_data;
1739 if (!tu->timeri)
1740 return -EBADFD;
1741 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1742}
1743
1744static int snd_timer_user_continue(struct file *file)
1745{
1746 int err;
1747 struct snd_timer_user *tu;
1748
1749 tu = file->private_data;
1750 if (!tu->timeri)
1751 return -EBADFD;
1752 tu->timeri->lost = 0;
1753 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1754}
1755
1756static int snd_timer_user_pause(struct file *file)
1757{
1758 int err;
1759 struct snd_timer_user *tu;
1760
1761 tu = file->private_data;
1762 if (!tu->timeri)
1763 return -EBADFD;
1764 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1765}
1766
1767enum {
1768 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1769 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1770 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1771 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1772};
1773
1774static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1775 unsigned long arg)
1776{
1777 struct snd_timer_user *tu;
1778 void __user *argp = (void __user *)arg;
1779 int __user *p = argp;
1780
1781 tu = file->private_data;
1782 switch (cmd) {
1783 case SNDRV_TIMER_IOCTL_PVERSION:
1784 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1785 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1786 return snd_timer_user_next_device(argp);
1787 case SNDRV_TIMER_IOCTL_TREAD:
1788 {
1789 int xarg;
1790
1791 mutex_lock(&tu->tread_sem);
1792 if (tu->timeri) { /* too late */
1793 mutex_unlock(&tu->tread_sem);
1794 return -EBUSY;
1795 }
1796 if (get_user(xarg, p)) {
1797 mutex_unlock(&tu->tread_sem);
1798 return -EFAULT;
1799 }
1800 tu->tread = xarg ? 1 : 0;
1801 mutex_unlock(&tu->tread_sem);
1802 return 0;
1803 }
1804 case SNDRV_TIMER_IOCTL_GINFO:
1805 return snd_timer_user_ginfo(file, argp);
1806 case SNDRV_TIMER_IOCTL_GPARAMS:
1807 return snd_timer_user_gparams(file, argp);
1808 case SNDRV_TIMER_IOCTL_GSTATUS:
1809 return snd_timer_user_gstatus(file, argp);
1810 case SNDRV_TIMER_IOCTL_SELECT:
1811 return snd_timer_user_tselect(file, argp);
1812 case SNDRV_TIMER_IOCTL_INFO:
1813 return snd_timer_user_info(file, argp);
1814 case SNDRV_TIMER_IOCTL_PARAMS:
1815 return snd_timer_user_params(file, argp);
1816 case SNDRV_TIMER_IOCTL_STATUS:
1817 return snd_timer_user_status(file, argp);
1818 case SNDRV_TIMER_IOCTL_START:
1819 case SNDRV_TIMER_IOCTL_START_OLD:
1820 return snd_timer_user_start(file);
1821 case SNDRV_TIMER_IOCTL_STOP:
1822 case SNDRV_TIMER_IOCTL_STOP_OLD:
1823 return snd_timer_user_stop(file);
1824 case SNDRV_TIMER_IOCTL_CONTINUE:
1825 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1826 return snd_timer_user_continue(file);
1827 case SNDRV_TIMER_IOCTL_PAUSE:
1828 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1829 return snd_timer_user_pause(file);
1830 }
1831 return -ENOTTY;
1832}
1833
1834static int snd_timer_user_fasync(int fd, struct file * file, int on)
1835{
1836 struct snd_timer_user *tu;
1837
1838 tu = file->private_data;
1839 return fasync_helper(fd, file, on, &tu->fasync);
1840}
1841
1842static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1843 size_t count, loff_t *offset)
1844{
1845 struct snd_timer_user *tu;
1846 long result = 0, unit;
1847 int err = 0;
1848
1849 tu = file->private_data;
1850 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1851 spin_lock_irq(&tu->qlock);
1852 while ((long)count - result >= unit) {
1853 while (!tu->qused) {
1854 wait_queue_t wait;
1855
1856 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1857 err = -EAGAIN;
1858 break;
1859 }
1860
1861 set_current_state(TASK_INTERRUPTIBLE);
1862 init_waitqueue_entry(&wait, current);
1863 add_wait_queue(&tu->qchange_sleep, &wait);
1864
1865 spin_unlock_irq(&tu->qlock);
1866 schedule();
1867 spin_lock_irq(&tu->qlock);
1868
1869 remove_wait_queue(&tu->qchange_sleep, &wait);
1870
1871 if (signal_pending(current)) {
1872 err = -ERESTARTSYS;
1873 break;
1874 }
1875 }
1876
1877 spin_unlock_irq(&tu->qlock);
1878 if (err < 0)
1879 goto _error;
1880
1881 if (tu->tread) {
1882 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1883 sizeof(struct snd_timer_tread))) {
1884 err = -EFAULT;
1885 goto _error;
1886 }
1887 } else {
1888 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1889 sizeof(struct snd_timer_read))) {
1890 err = -EFAULT;
1891 goto _error;
1892 }
1893 }
1894
1895 tu->qhead %= tu->queue_size;
1896
1897 result += unit;
1898 buffer += unit;
1899
1900 spin_lock_irq(&tu->qlock);
1901 tu->qused--;
1902 }
1903 spin_unlock_irq(&tu->qlock);
1904 _error:
1905 return result > 0 ? result : err;
1906}
1907
1908static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1909{
1910 unsigned int mask;
1911 struct snd_timer_user *tu;
1912
1913 tu = file->private_data;
1914
1915 poll_wait(file, &tu->qchange_sleep, wait);
1916
1917 mask = 0;
1918 if (tu->qused)
1919 mask |= POLLIN | POLLRDNORM;
1920
1921 return mask;
1922}
1923
1924#ifdef CONFIG_COMPAT
1925#include "timer_compat.c"
1926#else
1927#define snd_timer_user_ioctl_compat NULL
1928#endif
1929
1930static const struct file_operations snd_timer_f_ops =
1931{
1932 .owner = THIS_MODULE,
1933 .read = snd_timer_user_read,
1934 .open = snd_timer_user_open,
1935 .release = snd_timer_user_release,
1936 .llseek = no_llseek,
1937 .poll = snd_timer_user_poll,
1938 .unlocked_ioctl = snd_timer_user_ioctl,
1939 .compat_ioctl = snd_timer_user_ioctl_compat,
1940 .fasync = snd_timer_user_fasync,
1941};
1942
1943/*
1944 * ENTRY functions
1945 */
1946
1947static int __init alsa_timer_init(void)
1948{
1949 int err;
1950
1951#ifdef SNDRV_OSS_INFO_DEV_TIMERS
1952 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1953 "system timer");
1954#endif
1955
1956 if ((err = snd_timer_register_system()) < 0)
1957 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1958 err);
1959 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1960 &snd_timer_f_ops, NULL, "timer")) < 0)
1961 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1962 err);
1963 snd_timer_proc_init();
1964 return 0;
1965}
1966
1967static void __exit alsa_timer_exit(void)
1968{
1969 struct list_head *p, *n;
1970
1971 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1972 /* unregister the system timer */
1973 list_for_each_safe(p, n, &snd_timer_list) {
1974 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1975 snd_timer_free(timer);
1976 }
1977 snd_timer_proc_done();
1978#ifdef SNDRV_OSS_INFO_DEV_TIMERS
1979 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1980#endif
1981}
1982
1983module_init(alsa_timer_init)
1984module_exit(alsa_timer_exit)
1985
1986EXPORT_SYMBOL(snd_timer_open);
1987EXPORT_SYMBOL(snd_timer_close);
1988EXPORT_SYMBOL(snd_timer_resolution);
1989EXPORT_SYMBOL(snd_timer_start);
1990EXPORT_SYMBOL(snd_timer_stop);
1991EXPORT_SYMBOL(snd_timer_continue);
1992EXPORT_SYMBOL(snd_timer_pause);
1993EXPORT_SYMBOL(snd_timer_new);
1994EXPORT_SYMBOL(snd_timer_notify);
1995EXPORT_SYMBOL(snd_timer_global_new);
1996EXPORT_SYMBOL(snd_timer_global_free);
1997EXPORT_SYMBOL(snd_timer_global_register);
1998EXPORT_SYMBOL(snd_timer_interrupt);