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