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