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1/*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <linux/delay.h>
23#include <linux/init.h>
24#include <linux/slab.h>
25#include <linux/time.h>
26#include <linux/mutex.h>
27#include <linux/device.h>
28#include <linux/module.h>
29#include <linux/string.h>
30#include <sound/core.h>
31#include <sound/timer.h>
32#include <sound/control.h>
33#include <sound/info.h>
34#include <sound/minors.h>
35#include <sound/initval.h>
36#include <linux/kmod.h>
37
38#if IS_ENABLED(CONFIG_SND_HRTIMER)
39#define DEFAULT_TIMER_LIMIT 4
40#elif IS_ENABLED(CONFIG_SND_RTCTIMER)
41#define DEFAULT_TIMER_LIMIT 2
42#else
43#define DEFAULT_TIMER_LIMIT 1
44#endif
45
46static int timer_limit = DEFAULT_TIMER_LIMIT;
47static int timer_tstamp_monotonic = 1;
48MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
49MODULE_DESCRIPTION("ALSA timer interface");
50MODULE_LICENSE("GPL");
51module_param(timer_limit, int, 0444);
52MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
53module_param(timer_tstamp_monotonic, int, 0444);
54MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
55
56MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
57MODULE_ALIAS("devname:snd/timer");
58
59struct snd_timer_user {
60 struct snd_timer_instance *timeri;
61 int tread; /* enhanced read with timestamps and events */
62 unsigned long ticks;
63 unsigned long overrun;
64 int qhead;
65 int qtail;
66 int qused;
67 int queue_size;
68 bool disconnected;
69 struct snd_timer_read *queue;
70 struct snd_timer_tread *tqueue;
71 spinlock_t qlock;
72 unsigned long last_resolution;
73 unsigned int filter;
74 struct timespec tstamp; /* trigger tstamp */
75 wait_queue_head_t qchange_sleep;
76 struct fasync_struct *fasync;
77 struct mutex ioctl_lock;
78};
79
80/* list of timers */
81static LIST_HEAD(snd_timer_list);
82
83/* list of slave instances */
84static LIST_HEAD(snd_timer_slave_list);
85
86/* lock for slave active lists */
87static DEFINE_SPINLOCK(slave_active_lock);
88
89static DEFINE_MUTEX(register_mutex);
90
91static int snd_timer_free(struct snd_timer *timer);
92static int snd_timer_dev_free(struct snd_device *device);
93static int snd_timer_dev_register(struct snd_device *device);
94static int snd_timer_dev_disconnect(struct snd_device *device);
95
96static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
97
98/*
99 * create a timer instance with the given owner string.
100 * when timer is not NULL, increments the module counter
101 */
102static struct snd_timer_instance *snd_timer_instance_new(char *owner,
103 struct snd_timer *timer)
104{
105 struct snd_timer_instance *timeri;
106 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
107 if (timeri == NULL)
108 return NULL;
109 timeri->owner = kstrdup(owner, GFP_KERNEL);
110 if (! timeri->owner) {
111 kfree(timeri);
112 return NULL;
113 }
114 INIT_LIST_HEAD(&timeri->open_list);
115 INIT_LIST_HEAD(&timeri->active_list);
116 INIT_LIST_HEAD(&timeri->ack_list);
117 INIT_LIST_HEAD(&timeri->slave_list_head);
118 INIT_LIST_HEAD(&timeri->slave_active_head);
119
120 timeri->timer = timer;
121 if (timer && !try_module_get(timer->module)) {
122 kfree(timeri->owner);
123 kfree(timeri);
124 return NULL;
125 }
126
127 return timeri;
128}
129
130/*
131 * find a timer instance from the given timer id
132 */
133static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
134{
135 struct snd_timer *timer = NULL;
136
137 list_for_each_entry(timer, &snd_timer_list, device_list) {
138 if (timer->tmr_class != tid->dev_class)
139 continue;
140 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
141 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
142 (timer->card == NULL ||
143 timer->card->number != tid->card))
144 continue;
145 if (timer->tmr_device != tid->device)
146 continue;
147 if (timer->tmr_subdevice != tid->subdevice)
148 continue;
149 return timer;
150 }
151 return NULL;
152}
153
154#ifdef CONFIG_MODULES
155
156static void snd_timer_request(struct snd_timer_id *tid)
157{
158 switch (tid->dev_class) {
159 case SNDRV_TIMER_CLASS_GLOBAL:
160 if (tid->device < timer_limit)
161 request_module("snd-timer-%i", tid->device);
162 break;
163 case SNDRV_TIMER_CLASS_CARD:
164 case SNDRV_TIMER_CLASS_PCM:
165 if (tid->card < snd_ecards_limit)
166 request_module("snd-card-%i", tid->card);
167 break;
168 default:
169 break;
170 }
171}
172
173#endif
174
175/*
176 * look for a master instance matching with the slave id of the given slave.
177 * when found, relink the open_link of the slave.
178 *
179 * call this with register_mutex down.
180 */
181static void snd_timer_check_slave(struct snd_timer_instance *slave)
182{
183 struct snd_timer *timer;
184 struct snd_timer_instance *master;
185
186 /* FIXME: it's really dumb to look up all entries.. */
187 list_for_each_entry(timer, &snd_timer_list, device_list) {
188 list_for_each_entry(master, &timer->open_list_head, open_list) {
189 if (slave->slave_class == master->slave_class &&
190 slave->slave_id == master->slave_id) {
191 list_move_tail(&slave->open_list,
192 &master->slave_list_head);
193 spin_lock_irq(&slave_active_lock);
194 slave->master = master;
195 slave->timer = master->timer;
196 spin_unlock_irq(&slave_active_lock);
197 return;
198 }
199 }
200 }
201}
202
203/*
204 * look for slave instances matching with the slave id of the given master.
205 * when found, relink the open_link of slaves.
206 *
207 * call this with register_mutex down.
208 */
209static void snd_timer_check_master(struct snd_timer_instance *master)
210{
211 struct snd_timer_instance *slave, *tmp;
212
213 /* check all pending slaves */
214 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
215 if (slave->slave_class == master->slave_class &&
216 slave->slave_id == master->slave_id) {
217 list_move_tail(&slave->open_list, &master->slave_list_head);
218 spin_lock_irq(&slave_active_lock);
219 spin_lock(&master->timer->lock);
220 slave->master = master;
221 slave->timer = master->timer;
222 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
223 list_add_tail(&slave->active_list,
224 &master->slave_active_head);
225 spin_unlock(&master->timer->lock);
226 spin_unlock_irq(&slave_active_lock);
227 }
228 }
229}
230
231/*
232 * open a timer instance
233 * when opening a master, the slave id must be here given.
234 */
235int snd_timer_open(struct snd_timer_instance **ti,
236 char *owner, struct snd_timer_id *tid,
237 unsigned int slave_id)
238{
239 struct snd_timer *timer;
240 struct snd_timer_instance *timeri = NULL;
241
242 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
243 /* open a slave instance */
244 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
245 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
246 pr_debug("ALSA: timer: invalid slave class %i\n",
247 tid->dev_sclass);
248 return -EINVAL;
249 }
250 mutex_lock(®ister_mutex);
251 timeri = snd_timer_instance_new(owner, NULL);
252 if (!timeri) {
253 mutex_unlock(®ister_mutex);
254 return -ENOMEM;
255 }
256 timeri->slave_class = tid->dev_sclass;
257 timeri->slave_id = tid->device;
258 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
259 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
260 snd_timer_check_slave(timeri);
261 mutex_unlock(®ister_mutex);
262 *ti = timeri;
263 return 0;
264 }
265
266 /* open a master instance */
267 mutex_lock(®ister_mutex);
268 timer = snd_timer_find(tid);
269#ifdef CONFIG_MODULES
270 if (!timer) {
271 mutex_unlock(®ister_mutex);
272 snd_timer_request(tid);
273 mutex_lock(®ister_mutex);
274 timer = snd_timer_find(tid);
275 }
276#endif
277 if (!timer) {
278 mutex_unlock(®ister_mutex);
279 return -ENODEV;
280 }
281 if (!list_empty(&timer->open_list_head)) {
282 timeri = list_entry(timer->open_list_head.next,
283 struct snd_timer_instance, open_list);
284 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
285 mutex_unlock(®ister_mutex);
286 return -EBUSY;
287 }
288 }
289 timeri = snd_timer_instance_new(owner, timer);
290 if (!timeri) {
291 mutex_unlock(®ister_mutex);
292 return -ENOMEM;
293 }
294 /* take a card refcount for safe disconnection */
295 if (timer->card)
296 get_device(&timer->card->card_dev);
297 timeri->slave_class = tid->dev_sclass;
298 timeri->slave_id = slave_id;
299 if (list_empty(&timer->open_list_head) && timer->hw.open)
300 timer->hw.open(timer);
301 list_add_tail(&timeri->open_list, &timer->open_list_head);
302 snd_timer_check_master(timeri);
303 mutex_unlock(®ister_mutex);
304 *ti = timeri;
305 return 0;
306}
307
308/*
309 * close a timer instance
310 */
311int snd_timer_close(struct snd_timer_instance *timeri)
312{
313 struct snd_timer *timer = NULL;
314 struct snd_timer_instance *slave, *tmp;
315
316 if (snd_BUG_ON(!timeri))
317 return -ENXIO;
318
319 mutex_lock(®ister_mutex);
320 list_del(&timeri->open_list);
321
322 /* force to stop the timer */
323 snd_timer_stop(timeri);
324
325 timer = timeri->timer;
326 if (timer) {
327 /* wait, until the active callback is finished */
328 spin_lock_irq(&timer->lock);
329 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
330 spin_unlock_irq(&timer->lock);
331 udelay(10);
332 spin_lock_irq(&timer->lock);
333 }
334 spin_unlock_irq(&timer->lock);
335
336 /* remove slave links */
337 spin_lock_irq(&slave_active_lock);
338 spin_lock(&timer->lock);
339 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
340 open_list) {
341 list_move_tail(&slave->open_list, &snd_timer_slave_list);
342 slave->master = NULL;
343 slave->timer = NULL;
344 list_del_init(&slave->ack_list);
345 list_del_init(&slave->active_list);
346 }
347 spin_unlock(&timer->lock);
348 spin_unlock_irq(&slave_active_lock);
349
350 /* slave doesn't need to release timer resources below */
351 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
352 timer = NULL;
353 }
354
355 if (timeri->private_free)
356 timeri->private_free(timeri);
357 kfree(timeri->owner);
358 kfree(timeri);
359
360 if (timer) {
361 if (list_empty(&timer->open_list_head) && timer->hw.close)
362 timer->hw.close(timer);
363 /* release a card refcount for safe disconnection */
364 if (timer->card)
365 put_device(&timer->card->card_dev);
366 module_put(timer->module);
367 }
368
369 mutex_unlock(®ister_mutex);
370 return 0;
371}
372
373unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
374{
375 struct snd_timer * timer;
376
377 if (timeri == NULL)
378 return 0;
379 if ((timer = timeri->timer) != NULL) {
380 if (timer->hw.c_resolution)
381 return timer->hw.c_resolution(timer);
382 return timer->hw.resolution;
383 }
384 return 0;
385}
386
387static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
388{
389 struct snd_timer *timer;
390 unsigned long resolution = 0;
391 struct snd_timer_instance *ts;
392 struct timespec tstamp;
393
394 if (timer_tstamp_monotonic)
395 ktime_get_ts(&tstamp);
396 else
397 getnstimeofday(&tstamp);
398 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
399 event > SNDRV_TIMER_EVENT_PAUSE))
400 return;
401 if (event == SNDRV_TIMER_EVENT_START ||
402 event == SNDRV_TIMER_EVENT_CONTINUE)
403 resolution = snd_timer_resolution(ti);
404 if (ti->ccallback)
405 ti->ccallback(ti, event, &tstamp, resolution);
406 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
407 return;
408 timer = ti->timer;
409 if (timer == NULL)
410 return;
411 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
412 return;
413 list_for_each_entry(ts, &ti->slave_active_head, active_list)
414 if (ts->ccallback)
415 ts->ccallback(ts, event + 100, &tstamp, resolution);
416}
417
418/* start/continue a master timer */
419static int snd_timer_start1(struct snd_timer_instance *timeri,
420 bool start, unsigned long ticks)
421{
422 struct snd_timer *timer;
423 int result;
424 unsigned long flags;
425
426 timer = timeri->timer;
427 if (!timer)
428 return -EINVAL;
429
430 spin_lock_irqsave(&timer->lock, flags);
431 if (timer->card && timer->card->shutdown) {
432 result = -ENODEV;
433 goto unlock;
434 }
435 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
436 SNDRV_TIMER_IFLG_START)) {
437 result = -EBUSY;
438 goto unlock;
439 }
440
441 if (start)
442 timeri->ticks = timeri->cticks = ticks;
443 else if (!timeri->cticks)
444 timeri->cticks = 1;
445 timeri->pticks = 0;
446
447 list_move_tail(&timeri->active_list, &timer->active_list_head);
448 if (timer->running) {
449 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
450 goto __start_now;
451 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
452 timeri->flags |= SNDRV_TIMER_IFLG_START;
453 result = 1; /* delayed start */
454 } else {
455 if (start)
456 timer->sticks = ticks;
457 timer->hw.start(timer);
458 __start_now:
459 timer->running++;
460 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
461 result = 0;
462 }
463 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
464 SNDRV_TIMER_EVENT_CONTINUE);
465 unlock:
466 spin_unlock_irqrestore(&timer->lock, flags);
467 return result;
468}
469
470/* start/continue a slave timer */
471static int snd_timer_start_slave(struct snd_timer_instance *timeri,
472 bool start)
473{
474 unsigned long flags;
475
476 spin_lock_irqsave(&slave_active_lock, flags);
477 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
478 spin_unlock_irqrestore(&slave_active_lock, flags);
479 return -EBUSY;
480 }
481 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
482 if (timeri->master && timeri->timer) {
483 spin_lock(&timeri->timer->lock);
484 list_add_tail(&timeri->active_list,
485 &timeri->master->slave_active_head);
486 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
487 SNDRV_TIMER_EVENT_CONTINUE);
488 spin_unlock(&timeri->timer->lock);
489 }
490 spin_unlock_irqrestore(&slave_active_lock, flags);
491 return 1; /* delayed start */
492}
493
494/* stop/pause a master timer */
495static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
496{
497 struct snd_timer *timer;
498 int result = 0;
499 unsigned long flags;
500
501 timer = timeri->timer;
502 if (!timer)
503 return -EINVAL;
504 spin_lock_irqsave(&timer->lock, flags);
505 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
506 SNDRV_TIMER_IFLG_START))) {
507 result = -EBUSY;
508 goto unlock;
509 }
510 list_del_init(&timeri->ack_list);
511 list_del_init(&timeri->active_list);
512 if (timer->card && timer->card->shutdown)
513 goto unlock;
514 if (stop) {
515 timeri->cticks = timeri->ticks;
516 timeri->pticks = 0;
517 }
518 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
519 !(--timer->running)) {
520 timer->hw.stop(timer);
521 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
522 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
523 snd_timer_reschedule(timer, 0);
524 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
525 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
526 timer->hw.start(timer);
527 }
528 }
529 }
530 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
531 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
532 SNDRV_TIMER_EVENT_CONTINUE);
533 unlock:
534 spin_unlock_irqrestore(&timer->lock, flags);
535 return result;
536}
537
538/* stop/pause a slave timer */
539static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
540{
541 unsigned long flags;
542
543 spin_lock_irqsave(&slave_active_lock, flags);
544 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
545 spin_unlock_irqrestore(&slave_active_lock, flags);
546 return -EBUSY;
547 }
548 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
549 if (timeri->timer) {
550 spin_lock(&timeri->timer->lock);
551 list_del_init(&timeri->ack_list);
552 list_del_init(&timeri->active_list);
553 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
554 SNDRV_TIMER_EVENT_CONTINUE);
555 spin_unlock(&timeri->timer->lock);
556 }
557 spin_unlock_irqrestore(&slave_active_lock, flags);
558 return 0;
559}
560
561/*
562 * start the timer instance
563 */
564int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
565{
566 if (timeri == NULL || ticks < 1)
567 return -EINVAL;
568 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
569 return snd_timer_start_slave(timeri, true);
570 else
571 return snd_timer_start1(timeri, true, ticks);
572}
573
574/*
575 * stop the timer instance.
576 *
577 * do not call this from the timer callback!
578 */
579int snd_timer_stop(struct snd_timer_instance *timeri)
580{
581 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
582 return snd_timer_stop_slave(timeri, true);
583 else
584 return snd_timer_stop1(timeri, true);
585}
586
587/*
588 * start again.. the tick is kept.
589 */
590int snd_timer_continue(struct snd_timer_instance *timeri)
591{
592 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
593 return snd_timer_start_slave(timeri, false);
594 else
595 return snd_timer_start1(timeri, false, 0);
596}
597
598/*
599 * pause.. remember the ticks left
600 */
601int snd_timer_pause(struct snd_timer_instance * timeri)
602{
603 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
604 return snd_timer_stop_slave(timeri, false);
605 else
606 return snd_timer_stop1(timeri, false);
607}
608
609/*
610 * reschedule the timer
611 *
612 * start pending instances and check the scheduling ticks.
613 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
614 */
615static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
616{
617 struct snd_timer_instance *ti;
618 unsigned long ticks = ~0UL;
619
620 list_for_each_entry(ti, &timer->active_list_head, active_list) {
621 if (ti->flags & SNDRV_TIMER_IFLG_START) {
622 ti->flags &= ~SNDRV_TIMER_IFLG_START;
623 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
624 timer->running++;
625 }
626 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
627 if (ticks > ti->cticks)
628 ticks = ti->cticks;
629 }
630 }
631 if (ticks == ~0UL) {
632 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
633 return;
634 }
635 if (ticks > timer->hw.ticks)
636 ticks = timer->hw.ticks;
637 if (ticks_left != ticks)
638 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
639 timer->sticks = ticks;
640}
641
642/*
643 * timer tasklet
644 *
645 */
646static void snd_timer_tasklet(unsigned long arg)
647{
648 struct snd_timer *timer = (struct snd_timer *) arg;
649 struct snd_timer_instance *ti;
650 struct list_head *p;
651 unsigned long resolution, ticks;
652 unsigned long flags;
653
654 if (timer->card && timer->card->shutdown)
655 return;
656
657 spin_lock_irqsave(&timer->lock, flags);
658 /* now process all callbacks */
659 while (!list_empty(&timer->sack_list_head)) {
660 p = timer->sack_list_head.next; /* get first item */
661 ti = list_entry(p, struct snd_timer_instance, ack_list);
662
663 /* remove from ack_list and make empty */
664 list_del_init(p);
665
666 ticks = ti->pticks;
667 ti->pticks = 0;
668 resolution = ti->resolution;
669
670 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
671 spin_unlock(&timer->lock);
672 if (ti->callback)
673 ti->callback(ti, resolution, ticks);
674 spin_lock(&timer->lock);
675 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
676 }
677 spin_unlock_irqrestore(&timer->lock, flags);
678}
679
680/*
681 * timer interrupt
682 *
683 * ticks_left is usually equal to timer->sticks.
684 *
685 */
686void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
687{
688 struct snd_timer_instance *ti, *ts, *tmp;
689 unsigned long resolution, ticks;
690 struct list_head *p, *ack_list_head;
691 unsigned long flags;
692 int use_tasklet = 0;
693
694 if (timer == NULL)
695 return;
696
697 if (timer->card && timer->card->shutdown)
698 return;
699
700 spin_lock_irqsave(&timer->lock, flags);
701
702 /* remember the current resolution */
703 if (timer->hw.c_resolution)
704 resolution = timer->hw.c_resolution(timer);
705 else
706 resolution = timer->hw.resolution;
707
708 /* loop for all active instances
709 * Here we cannot use list_for_each_entry because the active_list of a
710 * processed instance is relinked to done_list_head before the callback
711 * is called.
712 */
713 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
714 active_list) {
715 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
716 continue;
717 ti->pticks += ticks_left;
718 ti->resolution = resolution;
719 if (ti->cticks < ticks_left)
720 ti->cticks = 0;
721 else
722 ti->cticks -= ticks_left;
723 if (ti->cticks) /* not expired */
724 continue;
725 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
726 ti->cticks = ti->ticks;
727 } else {
728 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
729 --timer->running;
730 list_del_init(&ti->active_list);
731 }
732 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
733 (ti->flags & SNDRV_TIMER_IFLG_FAST))
734 ack_list_head = &timer->ack_list_head;
735 else
736 ack_list_head = &timer->sack_list_head;
737 if (list_empty(&ti->ack_list))
738 list_add_tail(&ti->ack_list, ack_list_head);
739 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
740 ts->pticks = ti->pticks;
741 ts->resolution = resolution;
742 if (list_empty(&ts->ack_list))
743 list_add_tail(&ts->ack_list, ack_list_head);
744 }
745 }
746 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
747 snd_timer_reschedule(timer, timer->sticks);
748 if (timer->running) {
749 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
750 timer->hw.stop(timer);
751 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
752 }
753 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
754 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
755 /* restart timer */
756 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
757 timer->hw.start(timer);
758 }
759 } else {
760 timer->hw.stop(timer);
761 }
762
763 /* now process all fast callbacks */
764 while (!list_empty(&timer->ack_list_head)) {
765 p = timer->ack_list_head.next; /* get first item */
766 ti = list_entry(p, struct snd_timer_instance, ack_list);
767
768 /* remove from ack_list and make empty */
769 list_del_init(p);
770
771 ticks = ti->pticks;
772 ti->pticks = 0;
773
774 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
775 spin_unlock(&timer->lock);
776 if (ti->callback)
777 ti->callback(ti, resolution, ticks);
778 spin_lock(&timer->lock);
779 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
780 }
781
782 /* do we have any slow callbacks? */
783 use_tasklet = !list_empty(&timer->sack_list_head);
784 spin_unlock_irqrestore(&timer->lock, flags);
785
786 if (use_tasklet)
787 tasklet_schedule(&timer->task_queue);
788}
789
790/*
791
792 */
793
794int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
795 struct snd_timer **rtimer)
796{
797 struct snd_timer *timer;
798 int err;
799 static struct snd_device_ops ops = {
800 .dev_free = snd_timer_dev_free,
801 .dev_register = snd_timer_dev_register,
802 .dev_disconnect = snd_timer_dev_disconnect,
803 };
804
805 if (snd_BUG_ON(!tid))
806 return -EINVAL;
807 if (rtimer)
808 *rtimer = NULL;
809 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
810 if (!timer)
811 return -ENOMEM;
812 timer->tmr_class = tid->dev_class;
813 timer->card = card;
814 timer->tmr_device = tid->device;
815 timer->tmr_subdevice = tid->subdevice;
816 if (id)
817 strlcpy(timer->id, id, sizeof(timer->id));
818 INIT_LIST_HEAD(&timer->device_list);
819 INIT_LIST_HEAD(&timer->open_list_head);
820 INIT_LIST_HEAD(&timer->active_list_head);
821 INIT_LIST_HEAD(&timer->ack_list_head);
822 INIT_LIST_HEAD(&timer->sack_list_head);
823 spin_lock_init(&timer->lock);
824 tasklet_init(&timer->task_queue, snd_timer_tasklet,
825 (unsigned long)timer);
826 if (card != NULL) {
827 timer->module = card->module;
828 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
829 if (err < 0) {
830 snd_timer_free(timer);
831 return err;
832 }
833 }
834 if (rtimer)
835 *rtimer = timer;
836 return 0;
837}
838
839static int snd_timer_free(struct snd_timer *timer)
840{
841 if (!timer)
842 return 0;
843
844 mutex_lock(®ister_mutex);
845 if (! list_empty(&timer->open_list_head)) {
846 struct list_head *p, *n;
847 struct snd_timer_instance *ti;
848 pr_warn("ALSA: timer %p is busy?\n", timer);
849 list_for_each_safe(p, n, &timer->open_list_head) {
850 list_del_init(p);
851 ti = list_entry(p, struct snd_timer_instance, open_list);
852 ti->timer = NULL;
853 }
854 }
855 list_del(&timer->device_list);
856 mutex_unlock(®ister_mutex);
857
858 if (timer->private_free)
859 timer->private_free(timer);
860 kfree(timer);
861 return 0;
862}
863
864static int snd_timer_dev_free(struct snd_device *device)
865{
866 struct snd_timer *timer = device->device_data;
867 return snd_timer_free(timer);
868}
869
870static int snd_timer_dev_register(struct snd_device *dev)
871{
872 struct snd_timer *timer = dev->device_data;
873 struct snd_timer *timer1;
874
875 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
876 return -ENXIO;
877 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
878 !timer->hw.resolution && timer->hw.c_resolution == NULL)
879 return -EINVAL;
880
881 mutex_lock(®ister_mutex);
882 list_for_each_entry(timer1, &snd_timer_list, device_list) {
883 if (timer1->tmr_class > timer->tmr_class)
884 break;
885 if (timer1->tmr_class < timer->tmr_class)
886 continue;
887 if (timer1->card && timer->card) {
888 if (timer1->card->number > timer->card->number)
889 break;
890 if (timer1->card->number < timer->card->number)
891 continue;
892 }
893 if (timer1->tmr_device > timer->tmr_device)
894 break;
895 if (timer1->tmr_device < timer->tmr_device)
896 continue;
897 if (timer1->tmr_subdevice > timer->tmr_subdevice)
898 break;
899 if (timer1->tmr_subdevice < timer->tmr_subdevice)
900 continue;
901 /* conflicts.. */
902 mutex_unlock(®ister_mutex);
903 return -EBUSY;
904 }
905 list_add_tail(&timer->device_list, &timer1->device_list);
906 mutex_unlock(®ister_mutex);
907 return 0;
908}
909
910static int snd_timer_dev_disconnect(struct snd_device *device)
911{
912 struct snd_timer *timer = device->device_data;
913 struct snd_timer_instance *ti;
914
915 mutex_lock(®ister_mutex);
916 list_del_init(&timer->device_list);
917 /* wake up pending sleepers */
918 list_for_each_entry(ti, &timer->open_list_head, open_list) {
919 if (ti->disconnect)
920 ti->disconnect(ti);
921 }
922 mutex_unlock(®ister_mutex);
923 return 0;
924}
925
926void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
927{
928 unsigned long flags;
929 unsigned long resolution = 0;
930 struct snd_timer_instance *ti, *ts;
931
932 if (timer->card && timer->card->shutdown)
933 return;
934 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
935 return;
936 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
937 event > SNDRV_TIMER_EVENT_MRESUME))
938 return;
939 spin_lock_irqsave(&timer->lock, flags);
940 if (event == SNDRV_TIMER_EVENT_MSTART ||
941 event == SNDRV_TIMER_EVENT_MCONTINUE ||
942 event == SNDRV_TIMER_EVENT_MRESUME) {
943 if (timer->hw.c_resolution)
944 resolution = timer->hw.c_resolution(timer);
945 else
946 resolution = timer->hw.resolution;
947 }
948 list_for_each_entry(ti, &timer->active_list_head, active_list) {
949 if (ti->ccallback)
950 ti->ccallback(ti, event, tstamp, resolution);
951 list_for_each_entry(ts, &ti->slave_active_head, active_list)
952 if (ts->ccallback)
953 ts->ccallback(ts, event, tstamp, resolution);
954 }
955 spin_unlock_irqrestore(&timer->lock, flags);
956}
957
958/*
959 * exported functions for global timers
960 */
961int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
962{
963 struct snd_timer_id tid;
964
965 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
966 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
967 tid.card = -1;
968 tid.device = device;
969 tid.subdevice = 0;
970 return snd_timer_new(NULL, id, &tid, rtimer);
971}
972
973int snd_timer_global_free(struct snd_timer *timer)
974{
975 return snd_timer_free(timer);
976}
977
978int snd_timer_global_register(struct snd_timer *timer)
979{
980 struct snd_device dev;
981
982 memset(&dev, 0, sizeof(dev));
983 dev.device_data = timer;
984 return snd_timer_dev_register(&dev);
985}
986
987/*
988 * System timer
989 */
990
991struct snd_timer_system_private {
992 struct timer_list tlist;
993 unsigned long last_expires;
994 unsigned long last_jiffies;
995 unsigned long correction;
996};
997
998static void snd_timer_s_function(unsigned long data)
999{
1000 struct snd_timer *timer = (struct snd_timer *)data;
1001 struct snd_timer_system_private *priv = timer->private_data;
1002 unsigned long jiff = jiffies;
1003 if (time_after(jiff, priv->last_expires))
1004 priv->correction += (long)jiff - (long)priv->last_expires;
1005 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1006}
1007
1008static int snd_timer_s_start(struct snd_timer * timer)
1009{
1010 struct snd_timer_system_private *priv;
1011 unsigned long njiff;
1012
1013 priv = (struct snd_timer_system_private *) timer->private_data;
1014 njiff = (priv->last_jiffies = jiffies);
1015 if (priv->correction > timer->sticks - 1) {
1016 priv->correction -= timer->sticks - 1;
1017 njiff++;
1018 } else {
1019 njiff += timer->sticks - priv->correction;
1020 priv->correction = 0;
1021 }
1022 priv->last_expires = njiff;
1023 mod_timer(&priv->tlist, njiff);
1024 return 0;
1025}
1026
1027static int snd_timer_s_stop(struct snd_timer * timer)
1028{
1029 struct snd_timer_system_private *priv;
1030 unsigned long jiff;
1031
1032 priv = (struct snd_timer_system_private *) timer->private_data;
1033 del_timer(&priv->tlist);
1034 jiff = jiffies;
1035 if (time_before(jiff, priv->last_expires))
1036 timer->sticks = priv->last_expires - jiff;
1037 else
1038 timer->sticks = 1;
1039 priv->correction = 0;
1040 return 0;
1041}
1042
1043static int snd_timer_s_close(struct snd_timer *timer)
1044{
1045 struct snd_timer_system_private *priv;
1046
1047 priv = (struct snd_timer_system_private *)timer->private_data;
1048 del_timer_sync(&priv->tlist);
1049 return 0;
1050}
1051
1052static struct snd_timer_hardware snd_timer_system =
1053{
1054 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1055 .resolution = 1000000000L / HZ,
1056 .ticks = 10000000L,
1057 .close = snd_timer_s_close,
1058 .start = snd_timer_s_start,
1059 .stop = snd_timer_s_stop
1060};
1061
1062static void snd_timer_free_system(struct snd_timer *timer)
1063{
1064 kfree(timer->private_data);
1065}
1066
1067static int snd_timer_register_system(void)
1068{
1069 struct snd_timer *timer;
1070 struct snd_timer_system_private *priv;
1071 int err;
1072
1073 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1074 if (err < 0)
1075 return err;
1076 strcpy(timer->name, "system timer");
1077 timer->hw = snd_timer_system;
1078 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1079 if (priv == NULL) {
1080 snd_timer_free(timer);
1081 return -ENOMEM;
1082 }
1083 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1084 timer->private_data = priv;
1085 timer->private_free = snd_timer_free_system;
1086 return snd_timer_global_register(timer);
1087}
1088
1089#ifdef CONFIG_SND_PROC_FS
1090/*
1091 * Info interface
1092 */
1093
1094static void snd_timer_proc_read(struct snd_info_entry *entry,
1095 struct snd_info_buffer *buffer)
1096{
1097 struct snd_timer *timer;
1098 struct snd_timer_instance *ti;
1099
1100 mutex_lock(®ister_mutex);
1101 list_for_each_entry(timer, &snd_timer_list, device_list) {
1102 if (timer->card && timer->card->shutdown)
1103 continue;
1104 switch (timer->tmr_class) {
1105 case SNDRV_TIMER_CLASS_GLOBAL:
1106 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1107 break;
1108 case SNDRV_TIMER_CLASS_CARD:
1109 snd_iprintf(buffer, "C%i-%i: ",
1110 timer->card->number, timer->tmr_device);
1111 break;
1112 case SNDRV_TIMER_CLASS_PCM:
1113 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1114 timer->tmr_device, timer->tmr_subdevice);
1115 break;
1116 default:
1117 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1118 timer->card ? timer->card->number : -1,
1119 timer->tmr_device, timer->tmr_subdevice);
1120 }
1121 snd_iprintf(buffer, "%s :", timer->name);
1122 if (timer->hw.resolution)
1123 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1124 timer->hw.resolution / 1000,
1125 timer->hw.resolution % 1000,
1126 timer->hw.ticks);
1127 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1128 snd_iprintf(buffer, " SLAVE");
1129 snd_iprintf(buffer, "\n");
1130 list_for_each_entry(ti, &timer->open_list_head, open_list)
1131 snd_iprintf(buffer, " Client %s : %s\n",
1132 ti->owner ? ti->owner : "unknown",
1133 ti->flags & (SNDRV_TIMER_IFLG_START |
1134 SNDRV_TIMER_IFLG_RUNNING)
1135 ? "running" : "stopped");
1136 }
1137 mutex_unlock(®ister_mutex);
1138}
1139
1140static struct snd_info_entry *snd_timer_proc_entry;
1141
1142static void __init snd_timer_proc_init(void)
1143{
1144 struct snd_info_entry *entry;
1145
1146 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1147 if (entry != NULL) {
1148 entry->c.text.read = snd_timer_proc_read;
1149 if (snd_info_register(entry) < 0) {
1150 snd_info_free_entry(entry);
1151 entry = NULL;
1152 }
1153 }
1154 snd_timer_proc_entry = entry;
1155}
1156
1157static void __exit snd_timer_proc_done(void)
1158{
1159 snd_info_free_entry(snd_timer_proc_entry);
1160}
1161#else /* !CONFIG_SND_PROC_FS */
1162#define snd_timer_proc_init()
1163#define snd_timer_proc_done()
1164#endif
1165
1166/*
1167 * USER SPACE interface
1168 */
1169
1170static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1171 unsigned long resolution,
1172 unsigned long ticks)
1173{
1174 struct snd_timer_user *tu = timeri->callback_data;
1175 struct snd_timer_read *r;
1176 int prev;
1177
1178 spin_lock(&tu->qlock);
1179 if (tu->qused > 0) {
1180 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1181 r = &tu->queue[prev];
1182 if (r->resolution == resolution) {
1183 r->ticks += ticks;
1184 goto __wake;
1185 }
1186 }
1187 if (tu->qused >= tu->queue_size) {
1188 tu->overrun++;
1189 } else {
1190 r = &tu->queue[tu->qtail++];
1191 tu->qtail %= tu->queue_size;
1192 r->resolution = resolution;
1193 r->ticks = ticks;
1194 tu->qused++;
1195 }
1196 __wake:
1197 spin_unlock(&tu->qlock);
1198 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1199 wake_up(&tu->qchange_sleep);
1200}
1201
1202static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1203 struct snd_timer_tread *tread)
1204{
1205 if (tu->qused >= tu->queue_size) {
1206 tu->overrun++;
1207 } else {
1208 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1209 tu->qtail %= tu->queue_size;
1210 tu->qused++;
1211 }
1212}
1213
1214static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1215 int event,
1216 struct timespec *tstamp,
1217 unsigned long resolution)
1218{
1219 struct snd_timer_user *tu = timeri->callback_data;
1220 struct snd_timer_tread r1;
1221 unsigned long flags;
1222
1223 if (event >= SNDRV_TIMER_EVENT_START &&
1224 event <= SNDRV_TIMER_EVENT_PAUSE)
1225 tu->tstamp = *tstamp;
1226 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1227 return;
1228 r1.event = event;
1229 r1.tstamp = *tstamp;
1230 r1.val = resolution;
1231 spin_lock_irqsave(&tu->qlock, flags);
1232 snd_timer_user_append_to_tqueue(tu, &r1);
1233 spin_unlock_irqrestore(&tu->qlock, flags);
1234 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1235 wake_up(&tu->qchange_sleep);
1236}
1237
1238static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1239{
1240 struct snd_timer_user *tu = timeri->callback_data;
1241
1242 tu->disconnected = true;
1243 wake_up(&tu->qchange_sleep);
1244}
1245
1246static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1247 unsigned long resolution,
1248 unsigned long ticks)
1249{
1250 struct snd_timer_user *tu = timeri->callback_data;
1251 struct snd_timer_tread *r, r1;
1252 struct timespec tstamp;
1253 int prev, append = 0;
1254
1255 memset(&tstamp, 0, sizeof(tstamp));
1256 spin_lock(&tu->qlock);
1257 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1258 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1259 spin_unlock(&tu->qlock);
1260 return;
1261 }
1262 if (tu->last_resolution != resolution || ticks > 0) {
1263 if (timer_tstamp_monotonic)
1264 ktime_get_ts(&tstamp);
1265 else
1266 getnstimeofday(&tstamp);
1267 }
1268 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1269 tu->last_resolution != resolution) {
1270 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1271 r1.tstamp = tstamp;
1272 r1.val = resolution;
1273 snd_timer_user_append_to_tqueue(tu, &r1);
1274 tu->last_resolution = resolution;
1275 append++;
1276 }
1277 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1278 goto __wake;
1279 if (ticks == 0)
1280 goto __wake;
1281 if (tu->qused > 0) {
1282 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1283 r = &tu->tqueue[prev];
1284 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1285 r->tstamp = tstamp;
1286 r->val += ticks;
1287 append++;
1288 goto __wake;
1289 }
1290 }
1291 r1.event = SNDRV_TIMER_EVENT_TICK;
1292 r1.tstamp = tstamp;
1293 r1.val = ticks;
1294 snd_timer_user_append_to_tqueue(tu, &r1);
1295 append++;
1296 __wake:
1297 spin_unlock(&tu->qlock);
1298 if (append == 0)
1299 return;
1300 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1301 wake_up(&tu->qchange_sleep);
1302}
1303
1304static int snd_timer_user_open(struct inode *inode, struct file *file)
1305{
1306 struct snd_timer_user *tu;
1307 int err;
1308
1309 err = nonseekable_open(inode, file);
1310 if (err < 0)
1311 return err;
1312
1313 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1314 if (tu == NULL)
1315 return -ENOMEM;
1316 spin_lock_init(&tu->qlock);
1317 init_waitqueue_head(&tu->qchange_sleep);
1318 mutex_init(&tu->ioctl_lock);
1319 tu->ticks = 1;
1320 tu->queue_size = 128;
1321 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1322 GFP_KERNEL);
1323 if (tu->queue == NULL) {
1324 kfree(tu);
1325 return -ENOMEM;
1326 }
1327 file->private_data = tu;
1328 return 0;
1329}
1330
1331static int snd_timer_user_release(struct inode *inode, struct file *file)
1332{
1333 struct snd_timer_user *tu;
1334
1335 if (file->private_data) {
1336 tu = file->private_data;
1337 file->private_data = NULL;
1338 mutex_lock(&tu->ioctl_lock);
1339 if (tu->timeri)
1340 snd_timer_close(tu->timeri);
1341 mutex_unlock(&tu->ioctl_lock);
1342 kfree(tu->queue);
1343 kfree(tu->tqueue);
1344 kfree(tu);
1345 }
1346 return 0;
1347}
1348
1349static void snd_timer_user_zero_id(struct snd_timer_id *id)
1350{
1351 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1352 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1353 id->card = -1;
1354 id->device = -1;
1355 id->subdevice = -1;
1356}
1357
1358static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1359{
1360 id->dev_class = timer->tmr_class;
1361 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1362 id->card = timer->card ? timer->card->number : -1;
1363 id->device = timer->tmr_device;
1364 id->subdevice = timer->tmr_subdevice;
1365}
1366
1367static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1368{
1369 struct snd_timer_id id;
1370 struct snd_timer *timer;
1371 struct list_head *p;
1372
1373 if (copy_from_user(&id, _tid, sizeof(id)))
1374 return -EFAULT;
1375 mutex_lock(®ister_mutex);
1376 if (id.dev_class < 0) { /* first item */
1377 if (list_empty(&snd_timer_list))
1378 snd_timer_user_zero_id(&id);
1379 else {
1380 timer = list_entry(snd_timer_list.next,
1381 struct snd_timer, device_list);
1382 snd_timer_user_copy_id(&id, timer);
1383 }
1384 } else {
1385 switch (id.dev_class) {
1386 case SNDRV_TIMER_CLASS_GLOBAL:
1387 id.device = id.device < 0 ? 0 : id.device + 1;
1388 list_for_each(p, &snd_timer_list) {
1389 timer = list_entry(p, struct snd_timer, device_list);
1390 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1391 snd_timer_user_copy_id(&id, timer);
1392 break;
1393 }
1394 if (timer->tmr_device >= id.device) {
1395 snd_timer_user_copy_id(&id, timer);
1396 break;
1397 }
1398 }
1399 if (p == &snd_timer_list)
1400 snd_timer_user_zero_id(&id);
1401 break;
1402 case SNDRV_TIMER_CLASS_CARD:
1403 case SNDRV_TIMER_CLASS_PCM:
1404 if (id.card < 0) {
1405 id.card = 0;
1406 } else {
1407 if (id.card < 0) {
1408 id.card = 0;
1409 } else {
1410 if (id.device < 0) {
1411 id.device = 0;
1412 } else {
1413 if (id.subdevice < 0) {
1414 id.subdevice = 0;
1415 } else {
1416 id.subdevice++;
1417 }
1418 }
1419 }
1420 }
1421 list_for_each(p, &snd_timer_list) {
1422 timer = list_entry(p, struct snd_timer, device_list);
1423 if (timer->tmr_class > id.dev_class) {
1424 snd_timer_user_copy_id(&id, timer);
1425 break;
1426 }
1427 if (timer->tmr_class < id.dev_class)
1428 continue;
1429 if (timer->card->number > id.card) {
1430 snd_timer_user_copy_id(&id, timer);
1431 break;
1432 }
1433 if (timer->card->number < id.card)
1434 continue;
1435 if (timer->tmr_device > id.device) {
1436 snd_timer_user_copy_id(&id, timer);
1437 break;
1438 }
1439 if (timer->tmr_device < id.device)
1440 continue;
1441 if (timer->tmr_subdevice > id.subdevice) {
1442 snd_timer_user_copy_id(&id, timer);
1443 break;
1444 }
1445 if (timer->tmr_subdevice < id.subdevice)
1446 continue;
1447 snd_timer_user_copy_id(&id, timer);
1448 break;
1449 }
1450 if (p == &snd_timer_list)
1451 snd_timer_user_zero_id(&id);
1452 break;
1453 default:
1454 snd_timer_user_zero_id(&id);
1455 }
1456 }
1457 mutex_unlock(®ister_mutex);
1458 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1459 return -EFAULT;
1460 return 0;
1461}
1462
1463static int snd_timer_user_ginfo(struct file *file,
1464 struct snd_timer_ginfo __user *_ginfo)
1465{
1466 struct snd_timer_ginfo *ginfo;
1467 struct snd_timer_id tid;
1468 struct snd_timer *t;
1469 struct list_head *p;
1470 int err = 0;
1471
1472 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1473 if (IS_ERR(ginfo))
1474 return PTR_ERR(ginfo);
1475
1476 tid = ginfo->tid;
1477 memset(ginfo, 0, sizeof(*ginfo));
1478 ginfo->tid = tid;
1479 mutex_lock(®ister_mutex);
1480 t = snd_timer_find(&tid);
1481 if (t != NULL) {
1482 ginfo->card = t->card ? t->card->number : -1;
1483 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1484 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1485 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1486 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1487 ginfo->resolution = t->hw.resolution;
1488 if (t->hw.resolution_min > 0) {
1489 ginfo->resolution_min = t->hw.resolution_min;
1490 ginfo->resolution_max = t->hw.resolution_max;
1491 }
1492 list_for_each(p, &t->open_list_head) {
1493 ginfo->clients++;
1494 }
1495 } else {
1496 err = -ENODEV;
1497 }
1498 mutex_unlock(®ister_mutex);
1499 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1500 err = -EFAULT;
1501 kfree(ginfo);
1502 return err;
1503}
1504
1505static int timer_set_gparams(struct snd_timer_gparams *gparams)
1506{
1507 struct snd_timer *t;
1508 int err;
1509
1510 mutex_lock(®ister_mutex);
1511 t = snd_timer_find(&gparams->tid);
1512 if (!t) {
1513 err = -ENODEV;
1514 goto _error;
1515 }
1516 if (!list_empty(&t->open_list_head)) {
1517 err = -EBUSY;
1518 goto _error;
1519 }
1520 if (!t->hw.set_period) {
1521 err = -ENOSYS;
1522 goto _error;
1523 }
1524 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1525_error:
1526 mutex_unlock(®ister_mutex);
1527 return err;
1528}
1529
1530static int snd_timer_user_gparams(struct file *file,
1531 struct snd_timer_gparams __user *_gparams)
1532{
1533 struct snd_timer_gparams gparams;
1534
1535 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1536 return -EFAULT;
1537 return timer_set_gparams(&gparams);
1538}
1539
1540static int snd_timer_user_gstatus(struct file *file,
1541 struct snd_timer_gstatus __user *_gstatus)
1542{
1543 struct snd_timer_gstatus gstatus;
1544 struct snd_timer_id tid;
1545 struct snd_timer *t;
1546 int err = 0;
1547
1548 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1549 return -EFAULT;
1550 tid = gstatus.tid;
1551 memset(&gstatus, 0, sizeof(gstatus));
1552 gstatus.tid = tid;
1553 mutex_lock(®ister_mutex);
1554 t = snd_timer_find(&tid);
1555 if (t != NULL) {
1556 if (t->hw.c_resolution)
1557 gstatus.resolution = t->hw.c_resolution(t);
1558 else
1559 gstatus.resolution = t->hw.resolution;
1560 if (t->hw.precise_resolution) {
1561 t->hw.precise_resolution(t, &gstatus.resolution_num,
1562 &gstatus.resolution_den);
1563 } else {
1564 gstatus.resolution_num = gstatus.resolution;
1565 gstatus.resolution_den = 1000000000uL;
1566 }
1567 } else {
1568 err = -ENODEV;
1569 }
1570 mutex_unlock(®ister_mutex);
1571 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1572 err = -EFAULT;
1573 return err;
1574}
1575
1576static int snd_timer_user_tselect(struct file *file,
1577 struct snd_timer_select __user *_tselect)
1578{
1579 struct snd_timer_user *tu;
1580 struct snd_timer_select tselect;
1581 char str[32];
1582 int err = 0;
1583
1584 tu = file->private_data;
1585 if (tu->timeri) {
1586 snd_timer_close(tu->timeri);
1587 tu->timeri = NULL;
1588 }
1589 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1590 err = -EFAULT;
1591 goto __err;
1592 }
1593 sprintf(str, "application %i", current->pid);
1594 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1595 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1596 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1597 if (err < 0)
1598 goto __err;
1599
1600 kfree(tu->queue);
1601 tu->queue = NULL;
1602 kfree(tu->tqueue);
1603 tu->tqueue = NULL;
1604 if (tu->tread) {
1605 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1606 GFP_KERNEL);
1607 if (tu->tqueue == NULL)
1608 err = -ENOMEM;
1609 } else {
1610 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1611 GFP_KERNEL);
1612 if (tu->queue == NULL)
1613 err = -ENOMEM;
1614 }
1615
1616 if (err < 0) {
1617 snd_timer_close(tu->timeri);
1618 tu->timeri = NULL;
1619 } else {
1620 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1621 tu->timeri->callback = tu->tread
1622 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1623 tu->timeri->ccallback = snd_timer_user_ccallback;
1624 tu->timeri->callback_data = (void *)tu;
1625 tu->timeri->disconnect = snd_timer_user_disconnect;
1626 }
1627
1628 __err:
1629 return err;
1630}
1631
1632static int snd_timer_user_info(struct file *file,
1633 struct snd_timer_info __user *_info)
1634{
1635 struct snd_timer_user *tu;
1636 struct snd_timer_info *info;
1637 struct snd_timer *t;
1638 int err = 0;
1639
1640 tu = file->private_data;
1641 if (!tu->timeri)
1642 return -EBADFD;
1643 t = tu->timeri->timer;
1644 if (!t)
1645 return -EBADFD;
1646
1647 info = kzalloc(sizeof(*info), GFP_KERNEL);
1648 if (! info)
1649 return -ENOMEM;
1650 info->card = t->card ? t->card->number : -1;
1651 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1652 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1653 strlcpy(info->id, t->id, sizeof(info->id));
1654 strlcpy(info->name, t->name, sizeof(info->name));
1655 info->resolution = t->hw.resolution;
1656 if (copy_to_user(_info, info, sizeof(*_info)))
1657 err = -EFAULT;
1658 kfree(info);
1659 return err;
1660}
1661
1662static int snd_timer_user_params(struct file *file,
1663 struct snd_timer_params __user *_params)
1664{
1665 struct snd_timer_user *tu;
1666 struct snd_timer_params params;
1667 struct snd_timer *t;
1668 struct snd_timer_read *tr;
1669 struct snd_timer_tread *ttr;
1670 int err;
1671
1672 tu = file->private_data;
1673 if (!tu->timeri)
1674 return -EBADFD;
1675 t = tu->timeri->timer;
1676 if (!t)
1677 return -EBADFD;
1678 if (copy_from_user(¶ms, _params, sizeof(params)))
1679 return -EFAULT;
1680 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1681 err = -EINVAL;
1682 goto _end;
1683 }
1684 if (params.queue_size > 0 &&
1685 (params.queue_size < 32 || params.queue_size > 1024)) {
1686 err = -EINVAL;
1687 goto _end;
1688 }
1689 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1690 (1<<SNDRV_TIMER_EVENT_TICK)|
1691 (1<<SNDRV_TIMER_EVENT_START)|
1692 (1<<SNDRV_TIMER_EVENT_STOP)|
1693 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1694 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1695 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1696 (1<<SNDRV_TIMER_EVENT_RESUME)|
1697 (1<<SNDRV_TIMER_EVENT_MSTART)|
1698 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1699 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1700 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1701 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1702 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1703 err = -EINVAL;
1704 goto _end;
1705 }
1706 snd_timer_stop(tu->timeri);
1707 spin_lock_irq(&t->lock);
1708 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1709 SNDRV_TIMER_IFLG_EXCLUSIVE|
1710 SNDRV_TIMER_IFLG_EARLY_EVENT);
1711 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1712 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1713 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1714 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1715 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1716 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1717 spin_unlock_irq(&t->lock);
1718 if (params.queue_size > 0 &&
1719 (unsigned int)tu->queue_size != params.queue_size) {
1720 if (tu->tread) {
1721 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1722 GFP_KERNEL);
1723 if (ttr) {
1724 kfree(tu->tqueue);
1725 tu->queue_size = params.queue_size;
1726 tu->tqueue = ttr;
1727 }
1728 } else {
1729 tr = kmalloc(params.queue_size * sizeof(*tr),
1730 GFP_KERNEL);
1731 if (tr) {
1732 kfree(tu->queue);
1733 tu->queue_size = params.queue_size;
1734 tu->queue = tr;
1735 }
1736 }
1737 }
1738 tu->qhead = tu->qtail = tu->qused = 0;
1739 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1740 if (tu->tread) {
1741 struct snd_timer_tread tread;
1742 tread.event = SNDRV_TIMER_EVENT_EARLY;
1743 tread.tstamp.tv_sec = 0;
1744 tread.tstamp.tv_nsec = 0;
1745 tread.val = 0;
1746 snd_timer_user_append_to_tqueue(tu, &tread);
1747 } else {
1748 struct snd_timer_read *r = &tu->queue[0];
1749 r->resolution = 0;
1750 r->ticks = 0;
1751 tu->qused++;
1752 tu->qtail++;
1753 }
1754 }
1755 tu->filter = params.filter;
1756 tu->ticks = params.ticks;
1757 err = 0;
1758 _end:
1759 if (copy_to_user(_params, ¶ms, sizeof(params)))
1760 return -EFAULT;
1761 return err;
1762}
1763
1764static int snd_timer_user_status(struct file *file,
1765 struct snd_timer_status __user *_status)
1766{
1767 struct snd_timer_user *tu;
1768 struct snd_timer_status status;
1769
1770 tu = file->private_data;
1771 if (!tu->timeri)
1772 return -EBADFD;
1773 memset(&status, 0, sizeof(status));
1774 status.tstamp = tu->tstamp;
1775 status.resolution = snd_timer_resolution(tu->timeri);
1776 status.lost = tu->timeri->lost;
1777 status.overrun = tu->overrun;
1778 spin_lock_irq(&tu->qlock);
1779 status.queue = tu->qused;
1780 spin_unlock_irq(&tu->qlock);
1781 if (copy_to_user(_status, &status, sizeof(status)))
1782 return -EFAULT;
1783 return 0;
1784}
1785
1786static int snd_timer_user_start(struct file *file)
1787{
1788 int err;
1789 struct snd_timer_user *tu;
1790
1791 tu = file->private_data;
1792 if (!tu->timeri)
1793 return -EBADFD;
1794 snd_timer_stop(tu->timeri);
1795 tu->timeri->lost = 0;
1796 tu->last_resolution = 0;
1797 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1798}
1799
1800static int snd_timer_user_stop(struct file *file)
1801{
1802 int err;
1803 struct snd_timer_user *tu;
1804
1805 tu = file->private_data;
1806 if (!tu->timeri)
1807 return -EBADFD;
1808 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1809}
1810
1811static int snd_timer_user_continue(struct file *file)
1812{
1813 int err;
1814 struct snd_timer_user *tu;
1815
1816 tu = file->private_data;
1817 if (!tu->timeri)
1818 return -EBADFD;
1819 tu->timeri->lost = 0;
1820 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1821}
1822
1823static int snd_timer_user_pause(struct file *file)
1824{
1825 int err;
1826 struct snd_timer_user *tu;
1827
1828 tu = file->private_data;
1829 if (!tu->timeri)
1830 return -EBADFD;
1831 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1832}
1833
1834enum {
1835 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1836 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1837 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1838 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1839};
1840
1841static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1842 unsigned long arg)
1843{
1844 struct snd_timer_user *tu;
1845 void __user *argp = (void __user *)arg;
1846 int __user *p = argp;
1847
1848 tu = file->private_data;
1849 switch (cmd) {
1850 case SNDRV_TIMER_IOCTL_PVERSION:
1851 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1852 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1853 return snd_timer_user_next_device(argp);
1854 case SNDRV_TIMER_IOCTL_TREAD:
1855 {
1856 int xarg;
1857
1858 if (tu->timeri) /* too late */
1859 return -EBUSY;
1860 if (get_user(xarg, p))
1861 return -EFAULT;
1862 tu->tread = xarg ? 1 : 0;
1863 return 0;
1864 }
1865 case SNDRV_TIMER_IOCTL_GINFO:
1866 return snd_timer_user_ginfo(file, argp);
1867 case SNDRV_TIMER_IOCTL_GPARAMS:
1868 return snd_timer_user_gparams(file, argp);
1869 case SNDRV_TIMER_IOCTL_GSTATUS:
1870 return snd_timer_user_gstatus(file, argp);
1871 case SNDRV_TIMER_IOCTL_SELECT:
1872 return snd_timer_user_tselect(file, argp);
1873 case SNDRV_TIMER_IOCTL_INFO:
1874 return snd_timer_user_info(file, argp);
1875 case SNDRV_TIMER_IOCTL_PARAMS:
1876 return snd_timer_user_params(file, argp);
1877 case SNDRV_TIMER_IOCTL_STATUS:
1878 return snd_timer_user_status(file, argp);
1879 case SNDRV_TIMER_IOCTL_START:
1880 case SNDRV_TIMER_IOCTL_START_OLD:
1881 return snd_timer_user_start(file);
1882 case SNDRV_TIMER_IOCTL_STOP:
1883 case SNDRV_TIMER_IOCTL_STOP_OLD:
1884 return snd_timer_user_stop(file);
1885 case SNDRV_TIMER_IOCTL_CONTINUE:
1886 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1887 return snd_timer_user_continue(file);
1888 case SNDRV_TIMER_IOCTL_PAUSE:
1889 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1890 return snd_timer_user_pause(file);
1891 }
1892 return -ENOTTY;
1893}
1894
1895static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1896 unsigned long arg)
1897{
1898 struct snd_timer_user *tu = file->private_data;
1899 long ret;
1900
1901 mutex_lock(&tu->ioctl_lock);
1902 ret = __snd_timer_user_ioctl(file, cmd, arg);
1903 mutex_unlock(&tu->ioctl_lock);
1904 return ret;
1905}
1906
1907static int snd_timer_user_fasync(int fd, struct file * file, int on)
1908{
1909 struct snd_timer_user *tu;
1910
1911 tu = file->private_data;
1912 return fasync_helper(fd, file, on, &tu->fasync);
1913}
1914
1915static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1916 size_t count, loff_t *offset)
1917{
1918 struct snd_timer_user *tu;
1919 long result = 0, unit;
1920 int qhead;
1921 int err = 0;
1922
1923 tu = file->private_data;
1924 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1925 spin_lock_irq(&tu->qlock);
1926 while ((long)count - result >= unit) {
1927 while (!tu->qused) {
1928 wait_queue_t wait;
1929
1930 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1931 err = -EAGAIN;
1932 goto _error;
1933 }
1934
1935 set_current_state(TASK_INTERRUPTIBLE);
1936 init_waitqueue_entry(&wait, current);
1937 add_wait_queue(&tu->qchange_sleep, &wait);
1938
1939 spin_unlock_irq(&tu->qlock);
1940 schedule();
1941 spin_lock_irq(&tu->qlock);
1942
1943 remove_wait_queue(&tu->qchange_sleep, &wait);
1944
1945 if (tu->disconnected) {
1946 err = -ENODEV;
1947 goto _error;
1948 }
1949 if (signal_pending(current)) {
1950 err = -ERESTARTSYS;
1951 goto _error;
1952 }
1953 }
1954
1955 qhead = tu->qhead++;
1956 tu->qhead %= tu->queue_size;
1957 spin_unlock_irq(&tu->qlock);
1958
1959 if (tu->tread) {
1960 if (copy_to_user(buffer, &tu->tqueue[qhead],
1961 sizeof(struct snd_timer_tread)))
1962 err = -EFAULT;
1963 } else {
1964 if (copy_to_user(buffer, &tu->queue[qhead],
1965 sizeof(struct snd_timer_read)))
1966 err = -EFAULT;
1967 }
1968
1969 spin_lock_irq(&tu->qlock);
1970 tu->qused--;
1971 if (err < 0)
1972 goto _error;
1973 result += unit;
1974 buffer += unit;
1975 }
1976 _error:
1977 spin_unlock_irq(&tu->qlock);
1978 return result > 0 ? result : err;
1979}
1980
1981static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1982{
1983 unsigned int mask;
1984 struct snd_timer_user *tu;
1985
1986 tu = file->private_data;
1987
1988 poll_wait(file, &tu->qchange_sleep, wait);
1989
1990 mask = 0;
1991 if (tu->qused)
1992 mask |= POLLIN | POLLRDNORM;
1993 if (tu->disconnected)
1994 mask |= POLLERR;
1995
1996 return mask;
1997}
1998
1999#ifdef CONFIG_COMPAT
2000#include "timer_compat.c"
2001#else
2002#define snd_timer_user_ioctl_compat NULL
2003#endif
2004
2005static const struct file_operations snd_timer_f_ops =
2006{
2007 .owner = THIS_MODULE,
2008 .read = snd_timer_user_read,
2009 .open = snd_timer_user_open,
2010 .release = snd_timer_user_release,
2011 .llseek = no_llseek,
2012 .poll = snd_timer_user_poll,
2013 .unlocked_ioctl = snd_timer_user_ioctl,
2014 .compat_ioctl = snd_timer_user_ioctl_compat,
2015 .fasync = snd_timer_user_fasync,
2016};
2017
2018/* unregister the system timer */
2019static void snd_timer_free_all(void)
2020{
2021 struct snd_timer *timer, *n;
2022
2023 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2024 snd_timer_free(timer);
2025}
2026
2027static struct device timer_dev;
2028
2029/*
2030 * ENTRY functions
2031 */
2032
2033static int __init alsa_timer_init(void)
2034{
2035 int err;
2036
2037 snd_device_initialize(&timer_dev, NULL);
2038 dev_set_name(&timer_dev, "timer");
2039
2040#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2041 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2042 "system timer");
2043#endif
2044
2045 err = snd_timer_register_system();
2046 if (err < 0) {
2047 pr_err("ALSA: unable to register system timer (%i)\n", err);
2048 put_device(&timer_dev);
2049 return err;
2050 }
2051
2052 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2053 &snd_timer_f_ops, NULL, &timer_dev);
2054 if (err < 0) {
2055 pr_err("ALSA: unable to register timer device (%i)\n", err);
2056 snd_timer_free_all();
2057 put_device(&timer_dev);
2058 return err;
2059 }
2060
2061 snd_timer_proc_init();
2062 return 0;
2063}
2064
2065static void __exit alsa_timer_exit(void)
2066{
2067 snd_unregister_device(&timer_dev);
2068 snd_timer_free_all();
2069 put_device(&timer_dev);
2070 snd_timer_proc_done();
2071#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2072 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2073#endif
2074}
2075
2076module_init(alsa_timer_init)
2077module_exit(alsa_timer_exit)
2078
2079EXPORT_SYMBOL(snd_timer_open);
2080EXPORT_SYMBOL(snd_timer_close);
2081EXPORT_SYMBOL(snd_timer_resolution);
2082EXPORT_SYMBOL(snd_timer_start);
2083EXPORT_SYMBOL(snd_timer_stop);
2084EXPORT_SYMBOL(snd_timer_continue);
2085EXPORT_SYMBOL(snd_timer_pause);
2086EXPORT_SYMBOL(snd_timer_new);
2087EXPORT_SYMBOL(snd_timer_notify);
2088EXPORT_SYMBOL(snd_timer_global_new);
2089EXPORT_SYMBOL(snd_timer_global_free);
2090EXPORT_SYMBOL(snd_timer_global_register);
2091EXPORT_SYMBOL(snd_timer_interrupt);
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
47enum timer_tread_format {
48 TREAD_FORMAT_NONE = 0,
49 TREAD_FORMAT_TIME64,
50 TREAD_FORMAT_TIME32,
51};
52
53struct snd_timer_tread32 {
54 int event;
55 s32 tstamp_sec;
56 s32 tstamp_nsec;
57 unsigned int val;
58};
59
60struct snd_timer_tread64 {
61 int event;
62 u8 pad1[4];
63 s64 tstamp_sec;
64 s64 tstamp_nsec;
65 unsigned int val;
66 u8 pad2[4];
67};
68
69struct snd_timer_user {
70 struct snd_timer_instance *timeri;
71 int tread; /* enhanced read with timestamps and events */
72 unsigned long ticks;
73 unsigned long overrun;
74 int qhead;
75 int qtail;
76 int qused;
77 int queue_size;
78 bool disconnected;
79 struct snd_timer_read *queue;
80 struct snd_timer_tread64 *tqueue;
81 spinlock_t qlock;
82 unsigned long last_resolution;
83 unsigned int filter;
84 struct timespec64 tstamp; /* trigger tstamp */
85 wait_queue_head_t qchange_sleep;
86 struct snd_fasync *fasync;
87 struct mutex ioctl_lock;
88};
89
90struct snd_timer_status32 {
91 s32 tstamp_sec; /* Timestamp - last update */
92 s32 tstamp_nsec;
93 unsigned int resolution; /* current period resolution in ns */
94 unsigned int lost; /* counter of master tick lost */
95 unsigned int overrun; /* count of read queue overruns */
96 unsigned int queue; /* used queue size */
97 unsigned char reserved[64]; /* reserved */
98};
99
100#define SNDRV_TIMER_IOCTL_STATUS32 _IOR('T', 0x14, struct snd_timer_status32)
101
102struct snd_timer_status64 {
103 s64 tstamp_sec; /* Timestamp - last update */
104 s64 tstamp_nsec;
105 unsigned int resolution; /* current period resolution in ns */
106 unsigned int lost; /* counter of master tick lost */
107 unsigned int overrun; /* count of read queue overruns */
108 unsigned int queue; /* used queue size */
109 unsigned char reserved[64]; /* reserved */
110};
111
112#define SNDRV_TIMER_IOCTL_STATUS64 _IOR('T', 0x14, struct snd_timer_status64)
113
114/* list of timers */
115static LIST_HEAD(snd_timer_list);
116
117/* list of slave instances */
118static LIST_HEAD(snd_timer_slave_list);
119
120/* lock for slave active lists */
121static DEFINE_SPINLOCK(slave_active_lock);
122
123#define MAX_SLAVE_INSTANCES 1000
124static int num_slaves;
125
126static DEFINE_MUTEX(register_mutex);
127
128static int snd_timer_free(struct snd_timer *timer);
129static int snd_timer_dev_free(struct snd_device *device);
130static int snd_timer_dev_register(struct snd_device *device);
131static int snd_timer_dev_disconnect(struct snd_device *device);
132
133static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
134
135/*
136 * create a timer instance with the given owner string.
137 */
138struct snd_timer_instance *snd_timer_instance_new(const char *owner)
139{
140 struct snd_timer_instance *timeri;
141
142 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
143 if (timeri == NULL)
144 return NULL;
145 timeri->owner = kstrdup(owner, GFP_KERNEL);
146 if (! timeri->owner) {
147 kfree(timeri);
148 return NULL;
149 }
150 INIT_LIST_HEAD(&timeri->open_list);
151 INIT_LIST_HEAD(&timeri->active_list);
152 INIT_LIST_HEAD(&timeri->ack_list);
153 INIT_LIST_HEAD(&timeri->slave_list_head);
154 INIT_LIST_HEAD(&timeri->slave_active_head);
155
156 return timeri;
157}
158EXPORT_SYMBOL(snd_timer_instance_new);
159
160void snd_timer_instance_free(struct snd_timer_instance *timeri)
161{
162 if (timeri) {
163 if (timeri->private_free)
164 timeri->private_free(timeri);
165 kfree(timeri->owner);
166 kfree(timeri);
167 }
168}
169EXPORT_SYMBOL(snd_timer_instance_free);
170
171/*
172 * find a timer instance from the given timer id
173 */
174static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
175{
176 struct snd_timer *timer;
177
178 list_for_each_entry(timer, &snd_timer_list, device_list) {
179 if (timer->tmr_class != tid->dev_class)
180 continue;
181 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
182 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
183 (timer->card == NULL ||
184 timer->card->number != tid->card))
185 continue;
186 if (timer->tmr_device != tid->device)
187 continue;
188 if (timer->tmr_subdevice != tid->subdevice)
189 continue;
190 return timer;
191 }
192 return NULL;
193}
194
195#ifdef CONFIG_MODULES
196
197static void snd_timer_request(struct snd_timer_id *tid)
198{
199 switch (tid->dev_class) {
200 case SNDRV_TIMER_CLASS_GLOBAL:
201 if (tid->device < timer_limit)
202 request_module("snd-timer-%i", tid->device);
203 break;
204 case SNDRV_TIMER_CLASS_CARD:
205 case SNDRV_TIMER_CLASS_PCM:
206 if (tid->card < snd_ecards_limit)
207 request_module("snd-card-%i", tid->card);
208 break;
209 default:
210 break;
211 }
212}
213
214#endif
215
216/* move the slave if it belongs to the master; return 1 if match */
217static int check_matching_master_slave(struct snd_timer_instance *master,
218 struct snd_timer_instance *slave)
219{
220 if (slave->slave_class != master->slave_class ||
221 slave->slave_id != master->slave_id)
222 return 0;
223 if (master->timer->num_instances >= master->timer->max_instances)
224 return -EBUSY;
225 list_move_tail(&slave->open_list, &master->slave_list_head);
226 master->timer->num_instances++;
227 guard(spinlock_irq)(&slave_active_lock);
228 guard(spinlock)(&master->timer->lock);
229 slave->master = master;
230 slave->timer = master->timer;
231 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
232 list_add_tail(&slave->active_list, &master->slave_active_head);
233 return 1;
234}
235
236/*
237 * look for a master instance matching with the slave id of the given slave.
238 * when found, relink the open_link of the slave.
239 *
240 * call this with register_mutex down.
241 */
242static int snd_timer_check_slave(struct snd_timer_instance *slave)
243{
244 struct snd_timer *timer;
245 struct snd_timer_instance *master;
246 int err = 0;
247
248 /* FIXME: it's really dumb to look up all entries.. */
249 list_for_each_entry(timer, &snd_timer_list, device_list) {
250 list_for_each_entry(master, &timer->open_list_head, open_list) {
251 err = check_matching_master_slave(master, slave);
252 if (err != 0) /* match found or error */
253 goto out;
254 }
255 }
256 out:
257 return err < 0 ? err : 0;
258}
259
260/*
261 * look for slave instances matching with the slave id of the given master.
262 * when found, relink the open_link of slaves.
263 *
264 * call this with register_mutex down.
265 */
266static int snd_timer_check_master(struct snd_timer_instance *master)
267{
268 struct snd_timer_instance *slave, *tmp;
269 int err = 0;
270
271 /* check all pending slaves */
272 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
273 err = check_matching_master_slave(master, slave);
274 if (err < 0)
275 break;
276 }
277 return err < 0 ? err : 0;
278}
279
280static void snd_timer_close_locked(struct snd_timer_instance *timeri,
281 struct device **card_devp_to_put);
282
283/*
284 * open a timer instance
285 * when opening a master, the slave id must be here given.
286 */
287int snd_timer_open(struct snd_timer_instance *timeri,
288 struct snd_timer_id *tid,
289 unsigned int slave_id)
290{
291 struct snd_timer *timer;
292 struct device *card_dev_to_put = NULL;
293 int err;
294
295 mutex_lock(®ister_mutex);
296 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
297 /* open a slave instance */
298 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
299 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
300 pr_debug("ALSA: timer: invalid slave class %i\n",
301 tid->dev_sclass);
302 err = -EINVAL;
303 goto unlock;
304 }
305 if (num_slaves >= MAX_SLAVE_INSTANCES) {
306 err = -EBUSY;
307 goto unlock;
308 }
309 timeri->slave_class = tid->dev_sclass;
310 timeri->slave_id = tid->device;
311 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
312 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
313 num_slaves++;
314 err = snd_timer_check_slave(timeri);
315 goto list_added;
316 }
317
318 /* open a master instance */
319 timer = snd_timer_find(tid);
320#ifdef CONFIG_MODULES
321 if (!timer) {
322 mutex_unlock(®ister_mutex);
323 snd_timer_request(tid);
324 mutex_lock(®ister_mutex);
325 timer = snd_timer_find(tid);
326 }
327#endif
328 if (!timer) {
329 err = -ENODEV;
330 goto unlock;
331 }
332 if (!list_empty(&timer->open_list_head)) {
333 struct snd_timer_instance *t =
334 list_entry(timer->open_list_head.next,
335 struct snd_timer_instance, open_list);
336 if (t->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
337 err = -EBUSY;
338 goto unlock;
339 }
340 }
341 if (timer->num_instances >= timer->max_instances) {
342 err = -EBUSY;
343 goto unlock;
344 }
345 if (!try_module_get(timer->module)) {
346 err = -EBUSY;
347 goto unlock;
348 }
349 /* take a card refcount for safe disconnection */
350 if (timer->card) {
351 get_device(&timer->card->card_dev);
352 card_dev_to_put = &timer->card->card_dev;
353 }
354
355 if (list_empty(&timer->open_list_head) && timer->hw.open) {
356 err = timer->hw.open(timer);
357 if (err) {
358 module_put(timer->module);
359 goto unlock;
360 }
361 }
362
363 timeri->timer = timer;
364 timeri->slave_class = tid->dev_sclass;
365 timeri->slave_id = slave_id;
366
367 list_add_tail(&timeri->open_list, &timer->open_list_head);
368 timer->num_instances++;
369 err = snd_timer_check_master(timeri);
370list_added:
371 if (err < 0)
372 snd_timer_close_locked(timeri, &card_dev_to_put);
373
374 unlock:
375 mutex_unlock(®ister_mutex);
376 /* put_device() is called after unlock for avoiding deadlock */
377 if (err < 0 && card_dev_to_put)
378 put_device(card_dev_to_put);
379 return err;
380}
381EXPORT_SYMBOL(snd_timer_open);
382
383/* remove slave links, called from snd_timer_close_locked() below */
384static void remove_slave_links(struct snd_timer_instance *timeri,
385 struct snd_timer *timer)
386{
387 struct snd_timer_instance *slave, *tmp;
388
389 guard(spinlock_irq)(&slave_active_lock);
390 guard(spinlock)(&timer->lock);
391 timeri->timer = NULL;
392 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, open_list) {
393 list_move_tail(&slave->open_list, &snd_timer_slave_list);
394 timer->num_instances--;
395 slave->master = NULL;
396 slave->timer = NULL;
397 list_del_init(&slave->ack_list);
398 list_del_init(&slave->active_list);
399 }
400}
401
402/*
403 * close a timer instance
404 * call this with register_mutex down.
405 */
406static void snd_timer_close_locked(struct snd_timer_instance *timeri,
407 struct device **card_devp_to_put)
408{
409 struct snd_timer *timer = timeri->timer;
410
411 if (timer) {
412 guard(spinlock_irq)(&timer->lock);
413 timeri->flags |= SNDRV_TIMER_IFLG_DEAD;
414 }
415
416 if (!list_empty(&timeri->open_list)) {
417 list_del_init(&timeri->open_list);
418 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
419 num_slaves--;
420 }
421
422 /* force to stop the timer */
423 snd_timer_stop(timeri);
424
425 if (timer) {
426 timer->num_instances--;
427 /* wait, until the active callback is finished */
428 spin_lock_irq(&timer->lock);
429 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
430 spin_unlock_irq(&timer->lock);
431 udelay(10);
432 spin_lock_irq(&timer->lock);
433 }
434 spin_unlock_irq(&timer->lock);
435
436 remove_slave_links(timeri, timer);
437
438 /* slave doesn't need to release timer resources below */
439 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
440 timer = NULL;
441 }
442
443 if (timer) {
444 if (list_empty(&timer->open_list_head) && timer->hw.close)
445 timer->hw.close(timer);
446 /* release a card refcount for safe disconnection */
447 if (timer->card)
448 *card_devp_to_put = &timer->card->card_dev;
449 module_put(timer->module);
450 }
451}
452
453/*
454 * close a timer instance
455 */
456void snd_timer_close(struct snd_timer_instance *timeri)
457{
458 struct device *card_dev_to_put = NULL;
459
460 if (snd_BUG_ON(!timeri))
461 return;
462
463 scoped_guard(mutex, ®ister_mutex)
464 snd_timer_close_locked(timeri, &card_dev_to_put);
465 /* put_device() is called after unlock for avoiding deadlock */
466 if (card_dev_to_put)
467 put_device(card_dev_to_put);
468}
469EXPORT_SYMBOL(snd_timer_close);
470
471static unsigned long snd_timer_hw_resolution(struct snd_timer *timer)
472{
473 if (timer->hw.c_resolution)
474 return timer->hw.c_resolution(timer);
475 else
476 return timer->hw.resolution;
477}
478
479unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
480{
481 struct snd_timer * timer;
482 unsigned long ret = 0;
483
484 if (timeri == NULL)
485 return 0;
486 timer = timeri->timer;
487 if (timer) {
488 guard(spinlock_irqsave)(&timer->lock);
489 ret = snd_timer_hw_resolution(timer);
490 }
491 return ret;
492}
493EXPORT_SYMBOL(snd_timer_resolution);
494
495static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
496{
497 struct snd_timer *timer = ti->timer;
498 unsigned long resolution = 0;
499 struct snd_timer_instance *ts;
500 struct timespec64 tstamp;
501
502 if (timer_tstamp_monotonic)
503 ktime_get_ts64(&tstamp);
504 else
505 ktime_get_real_ts64(&tstamp);
506 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
507 event > SNDRV_TIMER_EVENT_PAUSE))
508 return;
509 if (timer &&
510 (event == SNDRV_TIMER_EVENT_START ||
511 event == SNDRV_TIMER_EVENT_CONTINUE))
512 resolution = snd_timer_hw_resolution(timer);
513 if (ti->ccallback)
514 ti->ccallback(ti, event, &tstamp, resolution);
515 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
516 return;
517 if (timer == NULL)
518 return;
519 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
520 return;
521 event += 10; /* convert to SNDRV_TIMER_EVENT_MXXX */
522 list_for_each_entry(ts, &ti->slave_active_head, active_list)
523 if (ts->ccallback)
524 ts->ccallback(ts, event, &tstamp, resolution);
525}
526
527/* start/continue a master timer */
528static int snd_timer_start1(struct snd_timer_instance *timeri,
529 bool start, unsigned long ticks)
530{
531 struct snd_timer *timer;
532 int result;
533
534 timer = timeri->timer;
535 if (!timer)
536 return -EINVAL;
537
538 guard(spinlock_irqsave)(&timer->lock);
539 if (timeri->flags & SNDRV_TIMER_IFLG_DEAD)
540 return -EINVAL;
541 if (timer->card && timer->card->shutdown)
542 return -ENODEV;
543 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
544 SNDRV_TIMER_IFLG_START))
545 return -EBUSY;
546
547 /* check the actual time for the start tick;
548 * bail out as error if it's way too low (< 100us)
549 */
550 if (start) {
551 if ((u64)snd_timer_hw_resolution(timer) * ticks < 100000)
552 return -EINVAL;
553 }
554
555 if (start)
556 timeri->ticks = timeri->cticks = ticks;
557 else if (!timeri->cticks)
558 timeri->cticks = 1;
559 timeri->pticks = 0;
560
561 list_move_tail(&timeri->active_list, &timer->active_list_head);
562 if (timer->running) {
563 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
564 goto __start_now;
565 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
566 timeri->flags |= SNDRV_TIMER_IFLG_START;
567 result = 1; /* delayed start */
568 } else {
569 if (start)
570 timer->sticks = ticks;
571 timer->hw.start(timer);
572 __start_now:
573 timer->running++;
574 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
575 result = 0;
576 }
577 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
578 SNDRV_TIMER_EVENT_CONTINUE);
579 return result;
580}
581
582/* start/continue a slave timer */
583static int snd_timer_start_slave(struct snd_timer_instance *timeri,
584 bool start)
585{
586 guard(spinlock_irqsave)(&slave_active_lock);
587 if (timeri->flags & SNDRV_TIMER_IFLG_DEAD)
588 return -EINVAL;
589 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING)
590 return -EBUSY;
591 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
592 if (timeri->master && timeri->timer) {
593 guard(spinlock)(&timeri->timer->lock);
594 list_add_tail(&timeri->active_list,
595 &timeri->master->slave_active_head);
596 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
597 SNDRV_TIMER_EVENT_CONTINUE);
598 }
599 return 1; /* delayed start */
600}
601
602/* stop/pause a master timer */
603static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
604{
605 struct snd_timer *timer;
606
607 timer = timeri->timer;
608 if (!timer)
609 return -EINVAL;
610 guard(spinlock_irqsave)(&timer->lock);
611 list_del_init(&timeri->ack_list);
612 list_del_init(&timeri->active_list);
613 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
614 SNDRV_TIMER_IFLG_START)))
615 return -EBUSY;
616 if (timer->card && timer->card->shutdown)
617 return 0;
618 if (stop) {
619 timeri->cticks = timeri->ticks;
620 timeri->pticks = 0;
621 }
622 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
623 !(--timer->running)) {
624 timer->hw.stop(timer);
625 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
626 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
627 snd_timer_reschedule(timer, 0);
628 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
629 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
630 timer->hw.start(timer);
631 }
632 }
633 }
634 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
635 if (stop)
636 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
637 else
638 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
639 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
640 SNDRV_TIMER_EVENT_PAUSE);
641 return 0;
642}
643
644/* stop/pause a slave timer */
645static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
646{
647 bool running;
648
649 guard(spinlock_irqsave)(&slave_active_lock);
650 running = timeri->flags & SNDRV_TIMER_IFLG_RUNNING;
651 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
652 if (timeri->timer) {
653 guard(spinlock)(&timeri->timer->lock);
654 list_del_init(&timeri->ack_list);
655 list_del_init(&timeri->active_list);
656 if (running)
657 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
658 SNDRV_TIMER_EVENT_PAUSE);
659 }
660 return running ? 0 : -EBUSY;
661}
662
663/*
664 * start the timer instance
665 */
666int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
667{
668 if (timeri == NULL || ticks < 1)
669 return -EINVAL;
670 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
671 return snd_timer_start_slave(timeri, true);
672 else
673 return snd_timer_start1(timeri, true, ticks);
674}
675EXPORT_SYMBOL(snd_timer_start);
676
677/*
678 * stop the timer instance.
679 *
680 * do not call this from the timer callback!
681 */
682int snd_timer_stop(struct snd_timer_instance *timeri)
683{
684 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
685 return snd_timer_stop_slave(timeri, true);
686 else
687 return snd_timer_stop1(timeri, true);
688}
689EXPORT_SYMBOL(snd_timer_stop);
690
691/*
692 * start again.. the tick is kept.
693 */
694int snd_timer_continue(struct snd_timer_instance *timeri)
695{
696 /* timer can continue only after pause */
697 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
698 return -EINVAL;
699
700 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
701 return snd_timer_start_slave(timeri, false);
702 else
703 return snd_timer_start1(timeri, false, 0);
704}
705EXPORT_SYMBOL(snd_timer_continue);
706
707/*
708 * pause.. remember the ticks left
709 */
710int snd_timer_pause(struct snd_timer_instance * timeri)
711{
712 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
713 return snd_timer_stop_slave(timeri, false);
714 else
715 return snd_timer_stop1(timeri, false);
716}
717EXPORT_SYMBOL(snd_timer_pause);
718
719/*
720 * reschedule the timer
721 *
722 * start pending instances and check the scheduling ticks.
723 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
724 */
725static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
726{
727 struct snd_timer_instance *ti;
728 unsigned long ticks = ~0UL;
729
730 list_for_each_entry(ti, &timer->active_list_head, active_list) {
731 if (ti->flags & SNDRV_TIMER_IFLG_START) {
732 ti->flags &= ~SNDRV_TIMER_IFLG_START;
733 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
734 timer->running++;
735 }
736 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
737 if (ticks > ti->cticks)
738 ticks = ti->cticks;
739 }
740 }
741 if (ticks == ~0UL) {
742 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
743 return;
744 }
745 if (ticks > timer->hw.ticks)
746 ticks = timer->hw.ticks;
747 if (ticks_left != ticks)
748 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
749 timer->sticks = ticks;
750}
751
752/* call callbacks in timer ack list */
753static void snd_timer_process_callbacks(struct snd_timer *timer,
754 struct list_head *head)
755{
756 struct snd_timer_instance *ti;
757 unsigned long resolution, ticks;
758
759 while (!list_empty(head)) {
760 ti = list_first_entry(head, struct snd_timer_instance,
761 ack_list);
762
763 /* remove from ack_list and make empty */
764 list_del_init(&ti->ack_list);
765
766 if (!(ti->flags & SNDRV_TIMER_IFLG_DEAD)) {
767 ticks = ti->pticks;
768 ti->pticks = 0;
769 resolution = ti->resolution;
770 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
771 spin_unlock(&timer->lock);
772 if (ti->callback)
773 ti->callback(ti, resolution, ticks);
774 spin_lock(&timer->lock);
775 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
776 }
777 }
778}
779
780/* clear pending instances from ack list */
781static void snd_timer_clear_callbacks(struct snd_timer *timer,
782 struct list_head *head)
783{
784 guard(spinlock_irqsave)(&timer->lock);
785 while (!list_empty(head))
786 list_del_init(head->next);
787}
788
789/*
790 * timer work
791 *
792 */
793static void snd_timer_work(struct work_struct *work)
794{
795 struct snd_timer *timer = container_of(work, struct snd_timer, task_work);
796
797 if (timer->card && timer->card->shutdown) {
798 snd_timer_clear_callbacks(timer, &timer->sack_list_head);
799 return;
800 }
801
802 guard(spinlock_irqsave)(&timer->lock);
803 snd_timer_process_callbacks(timer, &timer->sack_list_head);
804}
805
806/*
807 * timer interrupt
808 *
809 * ticks_left is usually equal to timer->sticks.
810 *
811 */
812void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
813{
814 struct snd_timer_instance *ti, *ts, *tmp;
815 unsigned long resolution;
816 struct list_head *ack_list_head;
817
818 if (timer == NULL)
819 return;
820
821 if (timer->card && timer->card->shutdown) {
822 snd_timer_clear_callbacks(timer, &timer->ack_list_head);
823 return;
824 }
825
826 guard(spinlock_irqsave)(&timer->lock);
827
828 /* remember the current resolution */
829 resolution = snd_timer_hw_resolution(timer);
830
831 /* loop for all active instances
832 * Here we cannot use list_for_each_entry because the active_list of a
833 * processed instance is relinked to done_list_head before the callback
834 * is called.
835 */
836 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
837 active_list) {
838 if (ti->flags & SNDRV_TIMER_IFLG_DEAD)
839 continue;
840 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
841 continue;
842 ti->pticks += ticks_left;
843 ti->resolution = resolution;
844 if (ti->cticks < ticks_left)
845 ti->cticks = 0;
846 else
847 ti->cticks -= ticks_left;
848 if (ti->cticks) /* not expired */
849 continue;
850 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
851 ti->cticks = ti->ticks;
852 } else {
853 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
854 --timer->running;
855 list_del_init(&ti->active_list);
856 }
857 if ((timer->hw.flags & SNDRV_TIMER_HW_WORK) ||
858 (ti->flags & SNDRV_TIMER_IFLG_FAST))
859 ack_list_head = &timer->ack_list_head;
860 else
861 ack_list_head = &timer->sack_list_head;
862 if (list_empty(&ti->ack_list))
863 list_add_tail(&ti->ack_list, ack_list_head);
864 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
865 ts->pticks = ti->pticks;
866 ts->resolution = resolution;
867 if (list_empty(&ts->ack_list))
868 list_add_tail(&ts->ack_list, ack_list_head);
869 }
870 }
871 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
872 snd_timer_reschedule(timer, timer->sticks);
873 if (timer->running) {
874 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
875 timer->hw.stop(timer);
876 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
877 }
878 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
879 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
880 /* restart timer */
881 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
882 timer->hw.start(timer);
883 }
884 } else {
885 timer->hw.stop(timer);
886 }
887
888 /* now process all fast callbacks */
889 snd_timer_process_callbacks(timer, &timer->ack_list_head);
890
891 /* do we have any slow callbacks? */
892 if (!list_empty(&timer->sack_list_head))
893 queue_work(system_highpri_wq, &timer->task_work);
894}
895EXPORT_SYMBOL(snd_timer_interrupt);
896
897/*
898
899 */
900
901int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
902 struct snd_timer **rtimer)
903{
904 struct snd_timer *timer;
905 int err;
906 static const struct snd_device_ops ops = {
907 .dev_free = snd_timer_dev_free,
908 .dev_register = snd_timer_dev_register,
909 .dev_disconnect = snd_timer_dev_disconnect,
910 };
911
912 if (snd_BUG_ON(!tid))
913 return -EINVAL;
914 if (tid->dev_class == SNDRV_TIMER_CLASS_CARD ||
915 tid->dev_class == SNDRV_TIMER_CLASS_PCM) {
916 if (WARN_ON(!card))
917 return -EINVAL;
918 }
919 if (rtimer)
920 *rtimer = NULL;
921 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
922 if (!timer)
923 return -ENOMEM;
924 timer->tmr_class = tid->dev_class;
925 timer->card = card;
926 timer->tmr_device = tid->device;
927 timer->tmr_subdevice = tid->subdevice;
928 if (id)
929 strscpy(timer->id, id, sizeof(timer->id));
930 timer->sticks = 1;
931 INIT_LIST_HEAD(&timer->device_list);
932 INIT_LIST_HEAD(&timer->open_list_head);
933 INIT_LIST_HEAD(&timer->active_list_head);
934 INIT_LIST_HEAD(&timer->ack_list_head);
935 INIT_LIST_HEAD(&timer->sack_list_head);
936 spin_lock_init(&timer->lock);
937 INIT_WORK(&timer->task_work, snd_timer_work);
938 timer->max_instances = 1000; /* default limit per timer */
939 if (card != NULL) {
940 timer->module = card->module;
941 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
942 if (err < 0) {
943 snd_timer_free(timer);
944 return err;
945 }
946 }
947 if (rtimer)
948 *rtimer = timer;
949 return 0;
950}
951EXPORT_SYMBOL(snd_timer_new);
952
953static int snd_timer_free(struct snd_timer *timer)
954{
955 if (!timer)
956 return 0;
957
958 guard(mutex)(®ister_mutex);
959 if (! list_empty(&timer->open_list_head)) {
960 struct list_head *p, *n;
961 struct snd_timer_instance *ti;
962 pr_warn("ALSA: timer %p is busy?\n", timer);
963 list_for_each_safe(p, n, &timer->open_list_head) {
964 list_del_init(p);
965 ti = list_entry(p, struct snd_timer_instance, open_list);
966 ti->timer = NULL;
967 }
968 }
969 list_del(&timer->device_list);
970
971 if (timer->private_free)
972 timer->private_free(timer);
973 kfree(timer);
974 return 0;
975}
976
977static int snd_timer_dev_free(struct snd_device *device)
978{
979 struct snd_timer *timer = device->device_data;
980 return snd_timer_free(timer);
981}
982
983static int snd_timer_dev_register(struct snd_device *dev)
984{
985 struct snd_timer *timer = dev->device_data;
986 struct snd_timer *timer1;
987
988 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
989 return -ENXIO;
990 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
991 !timer->hw.resolution && timer->hw.c_resolution == NULL)
992 return -EINVAL;
993
994 guard(mutex)(®ister_mutex);
995 list_for_each_entry(timer1, &snd_timer_list, device_list) {
996 if (timer1->tmr_class > timer->tmr_class)
997 break;
998 if (timer1->tmr_class < timer->tmr_class)
999 continue;
1000 if (timer1->card && timer->card) {
1001 if (timer1->card->number > timer->card->number)
1002 break;
1003 if (timer1->card->number < timer->card->number)
1004 continue;
1005 }
1006 if (timer1->tmr_device > timer->tmr_device)
1007 break;
1008 if (timer1->tmr_device < timer->tmr_device)
1009 continue;
1010 if (timer1->tmr_subdevice > timer->tmr_subdevice)
1011 break;
1012 if (timer1->tmr_subdevice < timer->tmr_subdevice)
1013 continue;
1014 /* conflicts.. */
1015 return -EBUSY;
1016 }
1017 list_add_tail(&timer->device_list, &timer1->device_list);
1018 return 0;
1019}
1020
1021static int snd_timer_dev_disconnect(struct snd_device *device)
1022{
1023 struct snd_timer *timer = device->device_data;
1024 struct snd_timer_instance *ti;
1025
1026 guard(mutex)(®ister_mutex);
1027 list_del_init(&timer->device_list);
1028 /* wake up pending sleepers */
1029 list_for_each_entry(ti, &timer->open_list_head, open_list) {
1030 if (ti->disconnect)
1031 ti->disconnect(ti);
1032 }
1033 return 0;
1034}
1035
1036void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tstamp)
1037{
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 guard(spinlock_irqsave)(&timer->lock);
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}
1061EXPORT_SYMBOL(snd_timer_notify);
1062
1063/*
1064 * exported functions for global timers
1065 */
1066int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1067{
1068 struct snd_timer_id tid;
1069
1070 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1071 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1072 tid.card = -1;
1073 tid.device = device;
1074 tid.subdevice = 0;
1075 return snd_timer_new(NULL, id, &tid, rtimer);
1076}
1077EXPORT_SYMBOL(snd_timer_global_new);
1078
1079int snd_timer_global_free(struct snd_timer *timer)
1080{
1081 return snd_timer_free(timer);
1082}
1083EXPORT_SYMBOL(snd_timer_global_free);
1084
1085int snd_timer_global_register(struct snd_timer *timer)
1086{
1087 struct snd_device dev;
1088
1089 memset(&dev, 0, sizeof(dev));
1090 dev.device_data = timer;
1091 return snd_timer_dev_register(&dev);
1092}
1093EXPORT_SYMBOL(snd_timer_global_register);
1094
1095/*
1096 * System timer
1097 */
1098
1099struct snd_timer_system_private {
1100 struct timer_list tlist;
1101 struct snd_timer *snd_timer;
1102 unsigned long last_expires;
1103 unsigned long last_jiffies;
1104 unsigned long correction;
1105};
1106
1107static void snd_timer_s_function(struct timer_list *t)
1108{
1109 struct snd_timer_system_private *priv = from_timer(priv, t,
1110 tlist);
1111 struct snd_timer *timer = priv->snd_timer;
1112 unsigned long jiff = jiffies;
1113 if (time_after(jiff, priv->last_expires))
1114 priv->correction += (long)jiff - (long)priv->last_expires;
1115 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1116}
1117
1118static int snd_timer_s_start(struct snd_timer * timer)
1119{
1120 struct snd_timer_system_private *priv;
1121 unsigned long njiff;
1122
1123 priv = (struct snd_timer_system_private *) timer->private_data;
1124 njiff = (priv->last_jiffies = jiffies);
1125 if (priv->correction > timer->sticks - 1) {
1126 priv->correction -= timer->sticks - 1;
1127 njiff++;
1128 } else {
1129 njiff += timer->sticks - priv->correction;
1130 priv->correction = 0;
1131 }
1132 priv->last_expires = njiff;
1133 mod_timer(&priv->tlist, njiff);
1134 return 0;
1135}
1136
1137static int snd_timer_s_stop(struct snd_timer * timer)
1138{
1139 struct snd_timer_system_private *priv;
1140 unsigned long jiff;
1141
1142 priv = (struct snd_timer_system_private *) timer->private_data;
1143 del_timer(&priv->tlist);
1144 jiff = jiffies;
1145 if (time_before(jiff, priv->last_expires))
1146 timer->sticks = priv->last_expires - jiff;
1147 else
1148 timer->sticks = 1;
1149 priv->correction = 0;
1150 return 0;
1151}
1152
1153static int snd_timer_s_close(struct snd_timer *timer)
1154{
1155 struct snd_timer_system_private *priv;
1156
1157 priv = (struct snd_timer_system_private *)timer->private_data;
1158 del_timer_sync(&priv->tlist);
1159 return 0;
1160}
1161
1162static const struct snd_timer_hardware snd_timer_system =
1163{
1164 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_WORK,
1165 .resolution = 1000000000L / HZ,
1166 .ticks = 10000000L,
1167 .close = snd_timer_s_close,
1168 .start = snd_timer_s_start,
1169 .stop = snd_timer_s_stop
1170};
1171
1172static void snd_timer_free_system(struct snd_timer *timer)
1173{
1174 kfree(timer->private_data);
1175}
1176
1177static int snd_timer_register_system(void)
1178{
1179 struct snd_timer *timer;
1180 struct snd_timer_system_private *priv;
1181 int err;
1182
1183 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1184 if (err < 0)
1185 return err;
1186 strcpy(timer->name, "system timer");
1187 timer->hw = snd_timer_system;
1188 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1189 if (priv == NULL) {
1190 snd_timer_free(timer);
1191 return -ENOMEM;
1192 }
1193 priv->snd_timer = timer;
1194 timer_setup(&priv->tlist, snd_timer_s_function, 0);
1195 timer->private_data = priv;
1196 timer->private_free = snd_timer_free_system;
1197 return snd_timer_global_register(timer);
1198}
1199
1200#ifdef CONFIG_SND_PROC_FS
1201/*
1202 * Info interface
1203 */
1204
1205static void snd_timer_proc_read(struct snd_info_entry *entry,
1206 struct snd_info_buffer *buffer)
1207{
1208 struct snd_timer *timer;
1209 struct snd_timer_instance *ti;
1210 unsigned long resolution;
1211
1212 guard(mutex)(®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 scoped_guard(spinlock_irq, &timer->lock)
1235 resolution = snd_timer_hw_resolution(timer);
1236 if (resolution)
1237 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1238 resolution / 1000,
1239 resolution % 1000,
1240 timer->hw.ticks);
1241 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1242 snd_iprintf(buffer, " SLAVE");
1243 snd_iprintf(buffer, "\n");
1244 list_for_each_entry(ti, &timer->open_list_head, open_list)
1245 snd_iprintf(buffer, " Client %s : %s\n",
1246 ti->owner ? ti->owner : "unknown",
1247 (ti->flags & (SNDRV_TIMER_IFLG_START |
1248 SNDRV_TIMER_IFLG_RUNNING))
1249 ? "running" : "stopped");
1250 }
1251}
1252
1253static struct snd_info_entry *snd_timer_proc_entry;
1254
1255static void __init snd_timer_proc_init(void)
1256{
1257 struct snd_info_entry *entry;
1258
1259 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1260 if (entry != NULL) {
1261 entry->c.text.read = snd_timer_proc_read;
1262 if (snd_info_register(entry) < 0) {
1263 snd_info_free_entry(entry);
1264 entry = NULL;
1265 }
1266 }
1267 snd_timer_proc_entry = entry;
1268}
1269
1270static void __exit snd_timer_proc_done(void)
1271{
1272 snd_info_free_entry(snd_timer_proc_entry);
1273}
1274#else /* !CONFIG_SND_PROC_FS */
1275#define snd_timer_proc_init()
1276#define snd_timer_proc_done()
1277#endif
1278
1279/*
1280 * USER SPACE interface
1281 */
1282
1283static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1284 unsigned long resolution,
1285 unsigned long ticks)
1286{
1287 struct snd_timer_user *tu = timeri->callback_data;
1288 struct snd_timer_read *r;
1289 int prev;
1290
1291 guard(spinlock)(&tu->qlock);
1292 if (tu->qused > 0) {
1293 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1294 r = &tu->queue[prev];
1295 if (r->resolution == resolution) {
1296 r->ticks += ticks;
1297 goto __wake;
1298 }
1299 }
1300 if (tu->qused >= tu->queue_size) {
1301 tu->overrun++;
1302 } else {
1303 r = &tu->queue[tu->qtail++];
1304 tu->qtail %= tu->queue_size;
1305 r->resolution = resolution;
1306 r->ticks = ticks;
1307 tu->qused++;
1308 }
1309 __wake:
1310 snd_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_tread64 *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 timespec64 *tstamp,
1329 unsigned long resolution)
1330{
1331 struct snd_timer_user *tu = timeri->callback_data;
1332 struct snd_timer_tread64 r1;
1333
1334 if (event >= SNDRV_TIMER_EVENT_START &&
1335 event <= SNDRV_TIMER_EVENT_PAUSE)
1336 tu->tstamp = *tstamp;
1337 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1338 return;
1339 memset(&r1, 0, sizeof(r1));
1340 r1.event = event;
1341 r1.tstamp_sec = tstamp->tv_sec;
1342 r1.tstamp_nsec = tstamp->tv_nsec;
1343 r1.val = resolution;
1344 scoped_guard(spinlock_irqsave, &tu->qlock)
1345 snd_timer_user_append_to_tqueue(tu, &r1);
1346 snd_kill_fasync(tu->fasync, SIGIO, POLL_IN);
1347 wake_up(&tu->qchange_sleep);
1348}
1349
1350static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1351{
1352 struct snd_timer_user *tu = timeri->callback_data;
1353
1354 tu->disconnected = true;
1355 wake_up(&tu->qchange_sleep);
1356}
1357
1358static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1359 unsigned long resolution,
1360 unsigned long ticks)
1361{
1362 struct snd_timer_user *tu = timeri->callback_data;
1363 struct snd_timer_tread64 *r, r1;
1364 struct timespec64 tstamp;
1365 int prev, append = 0;
1366
1367 memset(&r1, 0, sizeof(r1));
1368 memset(&tstamp, 0, sizeof(tstamp));
1369 scoped_guard(spinlock, &tu->qlock) {
1370 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1371 (1 << SNDRV_TIMER_EVENT_TICK))) == 0)
1372 return;
1373 if (tu->last_resolution != resolution || ticks > 0) {
1374 if (timer_tstamp_monotonic)
1375 ktime_get_ts64(&tstamp);
1376 else
1377 ktime_get_real_ts64(&tstamp);
1378 }
1379 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1380 tu->last_resolution != resolution) {
1381 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1382 r1.tstamp_sec = tstamp.tv_sec;
1383 r1.tstamp_nsec = tstamp.tv_nsec;
1384 r1.val = resolution;
1385 snd_timer_user_append_to_tqueue(tu, &r1);
1386 tu->last_resolution = resolution;
1387 append++;
1388 }
1389 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1390 break;
1391 if (ticks == 0)
1392 break;
1393 if (tu->qused > 0) {
1394 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1395 r = &tu->tqueue[prev];
1396 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1397 r->tstamp_sec = tstamp.tv_sec;
1398 r->tstamp_nsec = tstamp.tv_nsec;
1399 r->val += ticks;
1400 append++;
1401 break;
1402 }
1403 }
1404 r1.event = SNDRV_TIMER_EVENT_TICK;
1405 r1.tstamp_sec = tstamp.tv_sec;
1406 r1.tstamp_nsec = tstamp.tv_nsec;
1407 r1.val = ticks;
1408 snd_timer_user_append_to_tqueue(tu, &r1);
1409 append++;
1410 }
1411 if (append == 0)
1412 return;
1413 snd_kill_fasync(tu->fasync, SIGIO, POLL_IN);
1414 wake_up(&tu->qchange_sleep);
1415}
1416
1417static int realloc_user_queue(struct snd_timer_user *tu, int size)
1418{
1419 struct snd_timer_read *queue = NULL;
1420 struct snd_timer_tread64 *tqueue = NULL;
1421
1422 if (tu->tread) {
1423 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1424 if (!tqueue)
1425 return -ENOMEM;
1426 } else {
1427 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1428 if (!queue)
1429 return -ENOMEM;
1430 }
1431
1432 guard(spinlock_irq)(&tu->qlock);
1433 kfree(tu->queue);
1434 kfree(tu->tqueue);
1435 tu->queue_size = size;
1436 tu->queue = queue;
1437 tu->tqueue = tqueue;
1438 tu->qhead = tu->qtail = tu->qused = 0;
1439
1440 return 0;
1441}
1442
1443static int snd_timer_user_open(struct inode *inode, struct file *file)
1444{
1445 struct snd_timer_user *tu;
1446 int err;
1447
1448 err = stream_open(inode, file);
1449 if (err < 0)
1450 return err;
1451
1452 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1453 if (tu == NULL)
1454 return -ENOMEM;
1455 spin_lock_init(&tu->qlock);
1456 init_waitqueue_head(&tu->qchange_sleep);
1457 mutex_init(&tu->ioctl_lock);
1458 tu->ticks = 1;
1459 if (realloc_user_queue(tu, 128) < 0) {
1460 kfree(tu);
1461 return -ENOMEM;
1462 }
1463 file->private_data = tu;
1464 return 0;
1465}
1466
1467static int snd_timer_user_release(struct inode *inode, struct file *file)
1468{
1469 struct snd_timer_user *tu;
1470
1471 if (file->private_data) {
1472 tu = file->private_data;
1473 file->private_data = NULL;
1474 scoped_guard(mutex, &tu->ioctl_lock) {
1475 if (tu->timeri) {
1476 snd_timer_close(tu->timeri);
1477 snd_timer_instance_free(tu->timeri);
1478 }
1479 }
1480 snd_fasync_free(tu->fasync);
1481 kfree(tu->queue);
1482 kfree(tu->tqueue);
1483 kfree(tu);
1484 }
1485 return 0;
1486}
1487
1488static void snd_timer_user_zero_id(struct snd_timer_id *id)
1489{
1490 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1491 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1492 id->card = -1;
1493 id->device = -1;
1494 id->subdevice = -1;
1495}
1496
1497static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1498{
1499 id->dev_class = timer->tmr_class;
1500 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1501 id->card = timer->card ? timer->card->number : -1;
1502 id->device = timer->tmr_device;
1503 id->subdevice = timer->tmr_subdevice;
1504}
1505
1506static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1507{
1508 struct snd_timer_id id;
1509 struct snd_timer *timer;
1510 struct list_head *p;
1511
1512 if (copy_from_user(&id, _tid, sizeof(id)))
1513 return -EFAULT;
1514 guard(mutex)(®ister_mutex);
1515 if (id.dev_class < 0) { /* first item */
1516 if (list_empty(&snd_timer_list))
1517 snd_timer_user_zero_id(&id);
1518 else {
1519 timer = list_entry(snd_timer_list.next,
1520 struct snd_timer, device_list);
1521 snd_timer_user_copy_id(&id, timer);
1522 }
1523 } else {
1524 switch (id.dev_class) {
1525 case SNDRV_TIMER_CLASS_GLOBAL:
1526 id.device = id.device < 0 ? 0 : id.device + 1;
1527 list_for_each(p, &snd_timer_list) {
1528 timer = list_entry(p, struct snd_timer, device_list);
1529 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1530 snd_timer_user_copy_id(&id, timer);
1531 break;
1532 }
1533 if (timer->tmr_device >= id.device) {
1534 snd_timer_user_copy_id(&id, timer);
1535 break;
1536 }
1537 }
1538 if (p == &snd_timer_list)
1539 snd_timer_user_zero_id(&id);
1540 break;
1541 case SNDRV_TIMER_CLASS_CARD:
1542 case SNDRV_TIMER_CLASS_PCM:
1543 if (id.card < 0) {
1544 id.card = 0;
1545 } else {
1546 if (id.device < 0) {
1547 id.device = 0;
1548 } else {
1549 if (id.subdevice < 0)
1550 id.subdevice = 0;
1551 else if (id.subdevice < INT_MAX)
1552 id.subdevice++;
1553 }
1554 }
1555 list_for_each(p, &snd_timer_list) {
1556 timer = list_entry(p, struct snd_timer, device_list);
1557 if (timer->tmr_class > id.dev_class) {
1558 snd_timer_user_copy_id(&id, timer);
1559 break;
1560 }
1561 if (timer->tmr_class < id.dev_class)
1562 continue;
1563 if (timer->card->number > id.card) {
1564 snd_timer_user_copy_id(&id, timer);
1565 break;
1566 }
1567 if (timer->card->number < id.card)
1568 continue;
1569 if (timer->tmr_device > id.device) {
1570 snd_timer_user_copy_id(&id, timer);
1571 break;
1572 }
1573 if (timer->tmr_device < id.device)
1574 continue;
1575 if (timer->tmr_subdevice > id.subdevice) {
1576 snd_timer_user_copy_id(&id, timer);
1577 break;
1578 }
1579 if (timer->tmr_subdevice < id.subdevice)
1580 continue;
1581 snd_timer_user_copy_id(&id, timer);
1582 break;
1583 }
1584 if (p == &snd_timer_list)
1585 snd_timer_user_zero_id(&id);
1586 break;
1587 default:
1588 snd_timer_user_zero_id(&id);
1589 }
1590 }
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 __free(kfree) = NULL;
1600 struct snd_timer_id tid;
1601 struct snd_timer *t;
1602 struct list_head *p;
1603
1604 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1605 if (IS_ERR(ginfo))
1606 return PTR_ERR(no_free_ptr(ginfo));
1607
1608 tid = ginfo->tid;
1609 memset(ginfo, 0, sizeof(*ginfo));
1610 ginfo->tid = tid;
1611 guard(mutex)(®ister_mutex);
1612 t = snd_timer_find(&tid);
1613 if (!t)
1614 return -ENODEV;
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 strscpy(ginfo->id, t->id, sizeof(ginfo->id));
1619 strscpy(ginfo->name, t->name, sizeof(ginfo->name));
1620 scoped_guard(spinlock_irq, &t->lock)
1621 ginfo->resolution = snd_timer_hw_resolution(t);
1622 if (t->hw.resolution_min > 0) {
1623 ginfo->resolution_min = t->hw.resolution_min;
1624 ginfo->resolution_max = t->hw.resolution_max;
1625 }
1626 list_for_each(p, &t->open_list_head) {
1627 ginfo->clients++;
1628 }
1629 if (copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1630 return -EFAULT;
1631 return 0;
1632}
1633
1634static int timer_set_gparams(struct snd_timer_gparams *gparams)
1635{
1636 struct snd_timer *t;
1637
1638 guard(mutex)(®ister_mutex);
1639 t = snd_timer_find(&gparams->tid);
1640 if (!t)
1641 return -ENODEV;
1642 if (!list_empty(&t->open_list_head))
1643 return -EBUSY;
1644 if (!t->hw.set_period)
1645 return -ENOSYS;
1646 return t->hw.set_period(t, gparams->period_num, gparams->period_den);
1647}
1648
1649static int snd_timer_user_gparams(struct file *file,
1650 struct snd_timer_gparams __user *_gparams)
1651{
1652 struct snd_timer_gparams gparams;
1653
1654 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1655 return -EFAULT;
1656 return timer_set_gparams(&gparams);
1657}
1658
1659static int snd_timer_user_gstatus(struct file *file,
1660 struct snd_timer_gstatus __user *_gstatus)
1661{
1662 struct snd_timer_gstatus gstatus;
1663 struct snd_timer_id tid;
1664 struct snd_timer *t;
1665 int err = 0;
1666
1667 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1668 return -EFAULT;
1669 tid = gstatus.tid;
1670 memset(&gstatus, 0, sizeof(gstatus));
1671 gstatus.tid = tid;
1672 guard(mutex)(®ister_mutex);
1673 t = snd_timer_find(&tid);
1674 if (t != NULL) {
1675 guard(spinlock_irq)(&t->lock);
1676 gstatus.resolution = snd_timer_hw_resolution(t);
1677 if (t->hw.precise_resolution) {
1678 t->hw.precise_resolution(t, &gstatus.resolution_num,
1679 &gstatus.resolution_den);
1680 } else {
1681 gstatus.resolution_num = gstatus.resolution;
1682 gstatus.resolution_den = 1000000000uL;
1683 }
1684 } else {
1685 err = -ENODEV;
1686 }
1687 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1688 err = -EFAULT;
1689 return err;
1690}
1691
1692static int snd_timer_user_tselect(struct file *file,
1693 struct snd_timer_select __user *_tselect)
1694{
1695 struct snd_timer_user *tu;
1696 struct snd_timer_select tselect;
1697 char str[32];
1698 int err = 0;
1699
1700 tu = file->private_data;
1701 if (tu->timeri) {
1702 snd_timer_close(tu->timeri);
1703 snd_timer_instance_free(tu->timeri);
1704 tu->timeri = NULL;
1705 }
1706 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1707 err = -EFAULT;
1708 goto __err;
1709 }
1710 sprintf(str, "application %i", current->pid);
1711 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1712 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1713 tu->timeri = snd_timer_instance_new(str);
1714 if (!tu->timeri) {
1715 err = -ENOMEM;
1716 goto __err;
1717 }
1718
1719 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1720 tu->timeri->callback = tu->tread
1721 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1722 tu->timeri->ccallback = snd_timer_user_ccallback;
1723 tu->timeri->callback_data = (void *)tu;
1724 tu->timeri->disconnect = snd_timer_user_disconnect;
1725
1726 err = snd_timer_open(tu->timeri, &tselect.id, current->pid);
1727 if (err < 0) {
1728 snd_timer_instance_free(tu->timeri);
1729 tu->timeri = NULL;
1730 }
1731
1732 __err:
1733 return err;
1734}
1735
1736static int snd_timer_user_info(struct file *file,
1737 struct snd_timer_info __user *_info)
1738{
1739 struct snd_timer_user *tu;
1740 struct snd_timer_info *info __free(kfree) = NULL;
1741 struct snd_timer *t;
1742
1743 tu = file->private_data;
1744 if (!tu->timeri)
1745 return -EBADFD;
1746 t = tu->timeri->timer;
1747 if (!t)
1748 return -EBADFD;
1749
1750 info = kzalloc(sizeof(*info), GFP_KERNEL);
1751 if (! info)
1752 return -ENOMEM;
1753 info->card = t->card ? t->card->number : -1;
1754 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1755 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1756 strscpy(info->id, t->id, sizeof(info->id));
1757 strscpy(info->name, t->name, sizeof(info->name));
1758 scoped_guard(spinlock_irq, &t->lock)
1759 info->resolution = snd_timer_hw_resolution(t);
1760 if (copy_to_user(_info, info, sizeof(*_info)))
1761 return -EFAULT;
1762 return 0;
1763}
1764
1765static int snd_timer_user_params(struct file *file,
1766 struct snd_timer_params __user *_params)
1767{
1768 struct snd_timer_user *tu;
1769 struct snd_timer_params params;
1770 struct snd_timer *t;
1771 int err;
1772
1773 tu = file->private_data;
1774 if (!tu->timeri)
1775 return -EBADFD;
1776 t = tu->timeri->timer;
1777 if (!t)
1778 return -EBADFD;
1779 if (copy_from_user(¶ms, _params, sizeof(params)))
1780 return -EFAULT;
1781 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1782 u64 resolution;
1783
1784 if (params.ticks < 1) {
1785 err = -EINVAL;
1786 goto _end;
1787 }
1788
1789 /* Don't allow resolution less than 1ms */
1790 resolution = snd_timer_resolution(tu->timeri);
1791 resolution *= params.ticks;
1792 if (resolution < 1000000) {
1793 err = -EINVAL;
1794 goto _end;
1795 }
1796 }
1797 if (params.queue_size > 0 &&
1798 (params.queue_size < 32 || params.queue_size > 1024)) {
1799 err = -EINVAL;
1800 goto _end;
1801 }
1802 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1803 (1<<SNDRV_TIMER_EVENT_TICK)|
1804 (1<<SNDRV_TIMER_EVENT_START)|
1805 (1<<SNDRV_TIMER_EVENT_STOP)|
1806 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1807 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1808 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1809 (1<<SNDRV_TIMER_EVENT_RESUME)|
1810 (1<<SNDRV_TIMER_EVENT_MSTART)|
1811 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1812 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1813 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1814 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1815 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1816 err = -EINVAL;
1817 goto _end;
1818 }
1819 snd_timer_stop(tu->timeri);
1820 scoped_guard(spinlock_irq, &t->lock) {
1821 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1822 SNDRV_TIMER_IFLG_EXCLUSIVE|
1823 SNDRV_TIMER_IFLG_EARLY_EVENT);
1824 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1825 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1826 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1827 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1828 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1829 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1830 }
1831 if (params.queue_size > 0 &&
1832 (unsigned int)tu->queue_size != params.queue_size) {
1833 err = realloc_user_queue(tu, params.queue_size);
1834 if (err < 0)
1835 goto _end;
1836 }
1837 scoped_guard(spinlock_irq, &tu->qlock) {
1838 tu->qhead = tu->qtail = tu->qused = 0;
1839 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1840 if (tu->tread) {
1841 struct snd_timer_tread64 tread;
1842
1843 memset(&tread, 0, sizeof(tread));
1844 tread.event = SNDRV_TIMER_EVENT_EARLY;
1845 tread.tstamp_sec = 0;
1846 tread.tstamp_nsec = 0;
1847 tread.val = 0;
1848 snd_timer_user_append_to_tqueue(tu, &tread);
1849 } else {
1850 struct snd_timer_read *r = &tu->queue[0];
1851
1852 r->resolution = 0;
1853 r->ticks = 0;
1854 tu->qused++;
1855 tu->qtail++;
1856 }
1857 }
1858 tu->filter = params.filter;
1859 tu->ticks = params.ticks;
1860 }
1861 err = 0;
1862 _end:
1863 if (copy_to_user(_params, ¶ms, sizeof(params)))
1864 return -EFAULT;
1865 return err;
1866}
1867
1868static int snd_timer_user_status32(struct file *file,
1869 struct snd_timer_status32 __user *_status)
1870 {
1871 struct snd_timer_user *tu;
1872 struct snd_timer_status32 status;
1873
1874 tu = file->private_data;
1875 if (!tu->timeri)
1876 return -EBADFD;
1877 memset(&status, 0, sizeof(status));
1878 status.tstamp_sec = tu->tstamp.tv_sec;
1879 status.tstamp_nsec = tu->tstamp.tv_nsec;
1880 status.resolution = snd_timer_resolution(tu->timeri);
1881 status.lost = tu->timeri->lost;
1882 status.overrun = tu->overrun;
1883 scoped_guard(spinlock_irq, &tu->qlock)
1884 status.queue = tu->qused;
1885 if (copy_to_user(_status, &status, sizeof(status)))
1886 return -EFAULT;
1887 return 0;
1888}
1889
1890static int snd_timer_user_status64(struct file *file,
1891 struct snd_timer_status64 __user *_status)
1892{
1893 struct snd_timer_user *tu;
1894 struct snd_timer_status64 status;
1895
1896 tu = file->private_data;
1897 if (!tu->timeri)
1898 return -EBADFD;
1899 memset(&status, 0, sizeof(status));
1900 status.tstamp_sec = tu->tstamp.tv_sec;
1901 status.tstamp_nsec = tu->tstamp.tv_nsec;
1902 status.resolution = snd_timer_resolution(tu->timeri);
1903 status.lost = tu->timeri->lost;
1904 status.overrun = tu->overrun;
1905 scoped_guard(spinlock_irq, &tu->qlock)
1906 status.queue = tu->qused;
1907 if (copy_to_user(_status, &status, sizeof(status)))
1908 return -EFAULT;
1909 return 0;
1910}
1911
1912static int snd_timer_user_start(struct file *file)
1913{
1914 int err;
1915 struct snd_timer_user *tu;
1916
1917 tu = file->private_data;
1918 if (!tu->timeri)
1919 return -EBADFD;
1920 snd_timer_stop(tu->timeri);
1921 tu->timeri->lost = 0;
1922 tu->last_resolution = 0;
1923 err = snd_timer_start(tu->timeri, tu->ticks);
1924 if (err < 0)
1925 return err;
1926 return 0;
1927}
1928
1929static int snd_timer_user_stop(struct file *file)
1930{
1931 int err;
1932 struct snd_timer_user *tu;
1933
1934 tu = file->private_data;
1935 if (!tu->timeri)
1936 return -EBADFD;
1937 err = snd_timer_stop(tu->timeri);
1938 if (err < 0)
1939 return err;
1940 return 0;
1941}
1942
1943static int snd_timer_user_continue(struct file *file)
1944{
1945 int err;
1946 struct snd_timer_user *tu;
1947
1948 tu = file->private_data;
1949 if (!tu->timeri)
1950 return -EBADFD;
1951 /* start timer instead of continue if it's not used before */
1952 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1953 return snd_timer_user_start(file);
1954 tu->timeri->lost = 0;
1955 err = snd_timer_continue(tu->timeri);
1956 if (err < 0)
1957 return err;
1958 return 0;
1959}
1960
1961static int snd_timer_user_pause(struct file *file)
1962{
1963 int err;
1964 struct snd_timer_user *tu;
1965
1966 tu = file->private_data;
1967 if (!tu->timeri)
1968 return -EBADFD;
1969 err = snd_timer_pause(tu->timeri);
1970 if (err < 0)
1971 return err;
1972 return 0;
1973}
1974
1975static int snd_timer_user_tread(void __user *argp, struct snd_timer_user *tu,
1976 unsigned int cmd, bool compat)
1977{
1978 int __user *p = argp;
1979 int xarg, old_tread;
1980
1981 if (tu->timeri) /* too late */
1982 return -EBUSY;
1983 if (get_user(xarg, p))
1984 return -EFAULT;
1985
1986 old_tread = tu->tread;
1987
1988 if (!xarg)
1989 tu->tread = TREAD_FORMAT_NONE;
1990 else if (cmd == SNDRV_TIMER_IOCTL_TREAD64 ||
1991 (IS_ENABLED(CONFIG_64BIT) && !compat))
1992 tu->tread = TREAD_FORMAT_TIME64;
1993 else
1994 tu->tread = TREAD_FORMAT_TIME32;
1995
1996 if (tu->tread != old_tread &&
1997 realloc_user_queue(tu, tu->queue_size) < 0) {
1998 tu->tread = old_tread;
1999 return -ENOMEM;
2000 }
2001
2002 return 0;
2003}
2004
2005enum {
2006 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
2007 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
2008 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
2009 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
2010};
2011
2012static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
2013 unsigned long arg, bool compat)
2014{
2015 struct snd_timer_user *tu;
2016 void __user *argp = (void __user *)arg;
2017 int __user *p = argp;
2018
2019 tu = file->private_data;
2020 switch (cmd) {
2021 case SNDRV_TIMER_IOCTL_PVERSION:
2022 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
2023 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
2024 return snd_timer_user_next_device(argp);
2025 case SNDRV_TIMER_IOCTL_TREAD_OLD:
2026 case SNDRV_TIMER_IOCTL_TREAD64:
2027 return snd_timer_user_tread(argp, tu, cmd, compat);
2028 case SNDRV_TIMER_IOCTL_GINFO:
2029 return snd_timer_user_ginfo(file, argp);
2030 case SNDRV_TIMER_IOCTL_GPARAMS:
2031 return snd_timer_user_gparams(file, argp);
2032 case SNDRV_TIMER_IOCTL_GSTATUS:
2033 return snd_timer_user_gstatus(file, argp);
2034 case SNDRV_TIMER_IOCTL_SELECT:
2035 return snd_timer_user_tselect(file, argp);
2036 case SNDRV_TIMER_IOCTL_INFO:
2037 return snd_timer_user_info(file, argp);
2038 case SNDRV_TIMER_IOCTL_PARAMS:
2039 return snd_timer_user_params(file, argp);
2040 case SNDRV_TIMER_IOCTL_STATUS32:
2041 return snd_timer_user_status32(file, argp);
2042 case SNDRV_TIMER_IOCTL_STATUS64:
2043 return snd_timer_user_status64(file, argp);
2044 case SNDRV_TIMER_IOCTL_START:
2045 case SNDRV_TIMER_IOCTL_START_OLD:
2046 return snd_timer_user_start(file);
2047 case SNDRV_TIMER_IOCTL_STOP:
2048 case SNDRV_TIMER_IOCTL_STOP_OLD:
2049 return snd_timer_user_stop(file);
2050 case SNDRV_TIMER_IOCTL_CONTINUE:
2051 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
2052 return snd_timer_user_continue(file);
2053 case SNDRV_TIMER_IOCTL_PAUSE:
2054 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
2055 return snd_timer_user_pause(file);
2056 }
2057 return -ENOTTY;
2058}
2059
2060static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
2061 unsigned long arg)
2062{
2063 struct snd_timer_user *tu = file->private_data;
2064
2065 guard(mutex)(&tu->ioctl_lock);
2066 return __snd_timer_user_ioctl(file, cmd, arg, false);
2067}
2068
2069static int snd_timer_user_fasync(int fd, struct file * file, int on)
2070{
2071 struct snd_timer_user *tu;
2072
2073 tu = file->private_data;
2074 return snd_fasync_helper(fd, file, on, &tu->fasync);
2075}
2076
2077static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
2078 size_t count, loff_t *offset)
2079{
2080 struct snd_timer_tread64 *tread;
2081 struct snd_timer_tread32 tread32;
2082 struct snd_timer_user *tu;
2083 long result = 0, unit;
2084 int qhead;
2085 int err = 0;
2086
2087 tu = file->private_data;
2088 switch (tu->tread) {
2089 case TREAD_FORMAT_TIME64:
2090 unit = sizeof(struct snd_timer_tread64);
2091 break;
2092 case TREAD_FORMAT_TIME32:
2093 unit = sizeof(struct snd_timer_tread32);
2094 break;
2095 case TREAD_FORMAT_NONE:
2096 unit = sizeof(struct snd_timer_read);
2097 break;
2098 default:
2099 WARN_ONCE(1, "Corrupt snd_timer_user\n");
2100 return -ENOTSUPP;
2101 }
2102
2103 mutex_lock(&tu->ioctl_lock);
2104 spin_lock_irq(&tu->qlock);
2105 while ((long)count - result >= unit) {
2106 while (!tu->qused) {
2107 wait_queue_entry_t wait;
2108
2109 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
2110 err = -EAGAIN;
2111 goto _error;
2112 }
2113
2114 set_current_state(TASK_INTERRUPTIBLE);
2115 init_waitqueue_entry(&wait, current);
2116 add_wait_queue(&tu->qchange_sleep, &wait);
2117
2118 spin_unlock_irq(&tu->qlock);
2119 mutex_unlock(&tu->ioctl_lock);
2120 schedule();
2121 mutex_lock(&tu->ioctl_lock);
2122 spin_lock_irq(&tu->qlock);
2123
2124 remove_wait_queue(&tu->qchange_sleep, &wait);
2125
2126 if (tu->disconnected) {
2127 err = -ENODEV;
2128 goto _error;
2129 }
2130 if (signal_pending(current)) {
2131 err = -ERESTARTSYS;
2132 goto _error;
2133 }
2134 }
2135
2136 qhead = tu->qhead++;
2137 tu->qhead %= tu->queue_size;
2138 tu->qused--;
2139 spin_unlock_irq(&tu->qlock);
2140
2141 tread = &tu->tqueue[qhead];
2142
2143 switch (tu->tread) {
2144 case TREAD_FORMAT_TIME64:
2145 if (copy_to_user(buffer, tread,
2146 sizeof(struct snd_timer_tread64)))
2147 err = -EFAULT;
2148 break;
2149 case TREAD_FORMAT_TIME32:
2150 memset(&tread32, 0, sizeof(tread32));
2151 tread32 = (struct snd_timer_tread32) {
2152 .event = tread->event,
2153 .tstamp_sec = tread->tstamp_sec,
2154 .tstamp_nsec = tread->tstamp_nsec,
2155 .val = tread->val,
2156 };
2157
2158 if (copy_to_user(buffer, &tread32, sizeof(tread32)))
2159 err = -EFAULT;
2160 break;
2161 case TREAD_FORMAT_NONE:
2162 if (copy_to_user(buffer, &tu->queue[qhead],
2163 sizeof(struct snd_timer_read)))
2164 err = -EFAULT;
2165 break;
2166 default:
2167 err = -ENOTSUPP;
2168 break;
2169 }
2170
2171 spin_lock_irq(&tu->qlock);
2172 if (err < 0)
2173 goto _error;
2174 result += unit;
2175 buffer += unit;
2176 }
2177 _error:
2178 spin_unlock_irq(&tu->qlock);
2179 mutex_unlock(&tu->ioctl_lock);
2180 return result > 0 ? result : err;
2181}
2182
2183static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait)
2184{
2185 __poll_t mask;
2186 struct snd_timer_user *tu;
2187
2188 tu = file->private_data;
2189
2190 poll_wait(file, &tu->qchange_sleep, wait);
2191
2192 mask = 0;
2193 guard(spinlock_irq)(&tu->qlock);
2194 if (tu->qused)
2195 mask |= EPOLLIN | EPOLLRDNORM;
2196 if (tu->disconnected)
2197 mask |= EPOLLERR;
2198
2199 return mask;
2200}
2201
2202#ifdef CONFIG_COMPAT
2203#include "timer_compat.c"
2204#else
2205#define snd_timer_user_ioctl_compat NULL
2206#endif
2207
2208static const struct file_operations snd_timer_f_ops =
2209{
2210 .owner = THIS_MODULE,
2211 .read = snd_timer_user_read,
2212 .open = snd_timer_user_open,
2213 .release = snd_timer_user_release,
2214 .llseek = no_llseek,
2215 .poll = snd_timer_user_poll,
2216 .unlocked_ioctl = snd_timer_user_ioctl,
2217 .compat_ioctl = snd_timer_user_ioctl_compat,
2218 .fasync = snd_timer_user_fasync,
2219};
2220
2221/* unregister the system timer */
2222static void snd_timer_free_all(void)
2223{
2224 struct snd_timer *timer, *n;
2225
2226 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2227 snd_timer_free(timer);
2228}
2229
2230static struct device *timer_dev;
2231
2232/*
2233 * ENTRY functions
2234 */
2235
2236static int __init alsa_timer_init(void)
2237{
2238 int err;
2239
2240 err = snd_device_alloc(&timer_dev, NULL);
2241 if (err < 0)
2242 return err;
2243 dev_set_name(timer_dev, "timer");
2244
2245#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2246 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2247 "system timer");
2248#endif
2249
2250 err = snd_timer_register_system();
2251 if (err < 0) {
2252 pr_err("ALSA: unable to register system timer (%i)\n", err);
2253 goto put_timer;
2254 }
2255
2256 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2257 &snd_timer_f_ops, NULL, timer_dev);
2258 if (err < 0) {
2259 pr_err("ALSA: unable to register timer device (%i)\n", err);
2260 snd_timer_free_all();
2261 goto put_timer;
2262 }
2263
2264 snd_timer_proc_init();
2265 return 0;
2266
2267put_timer:
2268 put_device(timer_dev);
2269 return err;
2270}
2271
2272static void __exit alsa_timer_exit(void)
2273{
2274 snd_unregister_device(timer_dev);
2275 snd_timer_free_all();
2276 put_device(timer_dev);
2277 snd_timer_proc_done();
2278#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2279 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2280#endif
2281}
2282
2283module_init(alsa_timer_init)
2284module_exit(alsa_timer_exit)