?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
staging: rtl8192u: remove redundant assignment to pointer crypt
[linux/fpc-iii.git] / sound / core / timer.c
blob5c9fbf3f43407a33aeb9dcbb338d6b98c9f18dc3
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
34 static int timer_limit = DEFAULT_TIMER_LIMIT;
35 static int timer_tstamp_monotonic = 1;
36 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
37 MODULE_DESCRIPTION("ALSA timer interface");
38 MODULE_LICENSE("GPL");
39 module_param(timer_limit, int, 0444);
40 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
41 module_param(timer_tstamp_monotonic, int, 0444);
42 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
43
44 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
45 MODULE_ALIAS("devname:snd/timer");
46
47 struct snd_timer_user {
48 struct snd_timer_instance *timeri;
49 int tread; /* enhanced read with timestamps and events */
50 unsigned long ticks;
51 unsigned long overrun;
52 int qhead;
53 int qtail;
54 int qused;
55 int queue_size;
56 bool disconnected;
57 struct snd_timer_read *queue;
58 struct snd_timer_tread *tqueue;
59 spinlock_t qlock;
60 unsigned long last_resolution;
61 unsigned int filter;
62 struct timespec tstamp; /* trigger tstamp */
63 wait_queue_head_t qchange_sleep;
64 struct fasync_struct *fasync;
65 struct mutex ioctl_lock;
66 };
67
68 /* list of timers */
69 static LIST_HEAD(snd_timer_list);
70
71 /* list of slave instances */
72 static LIST_HEAD(snd_timer_slave_list);
73
74 /* lock for slave active lists */
75 static DEFINE_SPINLOCK(slave_active_lock);
76
77 static DEFINE_MUTEX(register_mutex);
78
79 static int snd_timer_free(struct snd_timer *timer);
80 static int snd_timer_dev_free(struct snd_device *device);
81 static int snd_timer_dev_register(struct snd_device *device);
82 static int snd_timer_dev_disconnect(struct snd_device *device);
83
84 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
85
86 /*
87 * create a timer instance with the given owner string.
88 * when timer is not NULL, increments the module counter
89 */
90 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
91 struct snd_timer *timer)
92 {
93 struct snd_timer_instance *timeri;
94 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
95 if (timeri == NULL)
96 return NULL;
97 timeri->owner = kstrdup(owner, GFP_KERNEL);
98 if (! timeri->owner) {
99 kfree(timeri);
100 return NULL;
101 }
102 INIT_LIST_HEAD(&timeri->open_list);
103 INIT_LIST_HEAD(&timeri->active_list);
104 INIT_LIST_HEAD(&timeri->ack_list);
105 INIT_LIST_HEAD(&timeri->slave_list_head);
106 INIT_LIST_HEAD(&timeri->slave_active_head);
107
108 timeri->timer = timer;
109 if (timer && !try_module_get(timer->module)) {
110 kfree(timeri->owner);
111 kfree(timeri);
112 return NULL;
113 }
114
115 return timeri;
116 }
117
118 /*
119 * find a timer instance from the given timer id
120 */
121 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
122 {
123 struct snd_timer *timer = NULL;
124
125 list_for_each_entry(timer, &snd_timer_list, device_list) {
126 if (timer->tmr_class != tid->dev_class)
127 continue;
128 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
129 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
130 (timer->card == NULL ||
131 timer->card->number != tid->card))
132 continue;
133 if (timer->tmr_device != tid->device)
134 continue;
135 if (timer->tmr_subdevice != tid->subdevice)
136 continue;
137 return timer;
138 }
139 return NULL;
140 }
141
142 #ifdef CONFIG_MODULES
143
144 static void snd_timer_request(struct snd_timer_id *tid)
145 {
146 switch (tid->dev_class) {
147 case SNDRV_TIMER_CLASS_GLOBAL:
148 if (tid->device < timer_limit)
149 request_module("snd-timer-%i", tid->device);
150 break;
151 case SNDRV_TIMER_CLASS_CARD:
152 case SNDRV_TIMER_CLASS_PCM:
153 if (tid->card < snd_ecards_limit)
154 request_module("snd-card-%i", tid->card);
155 break;
156 default:
157 break;
158 }
159 }
160
161 #endif
162
163 /*
164 * look for a master instance matching with the slave id of the given slave.
165 * when found, relink the open_link of the slave.
166 *
167 * call this with register_mutex down.
168 */
169 static int snd_timer_check_slave(struct snd_timer_instance *slave)
170 {
171 struct snd_timer *timer;
172 struct snd_timer_instance *master;
173
174 /* FIXME: it's really dumb to look up all entries.. */
175 list_for_each_entry(timer, &snd_timer_list, device_list) {
176 list_for_each_entry(master, &timer->open_list_head, open_list) {
177 if (slave->slave_class == master->slave_class &&
178 slave->slave_id == master->slave_id) {
179 if (master->timer->num_instances >=
180 master->timer->max_instances)
181 return -EBUSY;
182 list_move_tail(&slave->open_list,
183 &master->slave_list_head);
184 master->timer->num_instances++;
185 spin_lock_irq(&slave_active_lock);
186 slave->master = master;
187 slave->timer = master->timer;
188 spin_unlock_irq(&slave_active_lock);
189 return 0;
190 }
191 }
192 }
193 return 0;
194 }
195
196 /*
197 * look for slave instances matching with the slave id of the given master.
198 * when found, relink the open_link of slaves.
199 *
200 * call this with register_mutex down.
201 */
202 static int snd_timer_check_master(struct snd_timer_instance *master)
203 {
204 struct snd_timer_instance *slave, *tmp;
205
206 /* check all pending slaves */
207 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
208 if (slave->slave_class == master->slave_class &&
209 slave->slave_id == master->slave_id) {
210 if (master->timer->num_instances >=
211 master->timer->max_instances)
212 return -EBUSY;
213 list_move_tail(&slave->open_list, &master->slave_list_head);
214 master->timer->num_instances++;
215 spin_lock_irq(&slave_active_lock);
216 spin_lock(&master->timer->lock);
217 slave->master = master;
218 slave->timer = master->timer;
219 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
220 list_add_tail(&slave->active_list,
221 &master->slave_active_head);
222 spin_unlock(&master->timer->lock);
223 spin_unlock_irq(&slave_active_lock);
224 }
225 }
226 return 0;
227 }
228
229 static int snd_timer_close_locked(struct snd_timer_instance *timeri);
230
231 /*
232 * open a timer instance
233 * when opening a master, the slave id must be here given.
234 */
235 int snd_timer_open(struct snd_timer_instance **ti,
236 char *owner, struct snd_timer_id *tid,
237 unsigned int slave_id)
238 {
239 struct snd_timer *timer;
240 struct snd_timer_instance *timeri = NULL;
241 int err;
242
243 mutex_lock(&register_mutex);
244 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
245 /* open a slave instance */
246 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
247 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
248 pr_debug("ALSA: timer: invalid slave class %i\n",
249 tid->dev_sclass);
250 err = -EINVAL;
251 goto unlock;
252 }
253 timeri = snd_timer_instance_new(owner, NULL);
254 if (!timeri) {
255 err = -ENOMEM;
256 goto unlock;
257 }
258 timeri->slave_class = tid->dev_sclass;
259 timeri->slave_id = tid->device;
260 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
261 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
262 err = snd_timer_check_slave(timeri);
263 if (err < 0) {
264 snd_timer_close_locked(timeri);
265 timeri = NULL;
266 }
267 goto unlock;
268 }
269
270 /* open a master instance */
271 timer = snd_timer_find(tid);
272 #ifdef CONFIG_MODULES
273 if (!timer) {
274 mutex_unlock(&register_mutex);
275 snd_timer_request(tid);
276 mutex_lock(&register_mutex);
277 timer = snd_timer_find(tid);
278 }
279 #endif
280 if (!timer) {
281 err = -ENODEV;
282 goto unlock;
283 }
284 if (!list_empty(&timer->open_list_head)) {
285 timeri = list_entry(timer->open_list_head.next,
286 struct snd_timer_instance, open_list);
287 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
288 err = -EBUSY;
289 timeri = NULL;
290 goto unlock;
291 }
292 }
293 if (timer->num_instances >= timer->max_instances) {
294 err = -EBUSY;
295 goto unlock;
296 }
297 timeri = snd_timer_instance_new(owner, timer);
298 if (!timeri) {
299 err = -ENOMEM;
300 goto unlock;
301 }
302 /* take a card refcount for safe disconnection */
303 if (timer->card)
304 get_device(&timer->card->card_dev);
305 timeri->slave_class = tid->dev_sclass;
306 timeri->slave_id = slave_id;
307
308 if (list_empty(&timer->open_list_head) && timer->hw.open) {
309 err = timer->hw.open(timer);
310 if (err) {
311 kfree(timeri->owner);
312 kfree(timeri);
313 timeri = NULL;
314
315 if (timer->card)
316 put_device(&timer->card->card_dev);
317 module_put(timer->module);
318 goto unlock;
319 }
320 }
321
322 list_add_tail(&timeri->open_list, &timer->open_list_head);
323 timer->num_instances++;
324 err = snd_timer_check_master(timeri);
325 if (err < 0) {
326 snd_timer_close_locked(timeri);
327 timeri = NULL;
328 }
329
330 unlock:
331 mutex_unlock(&register_mutex);
332 *ti = timeri;
333 return err;
334 }
335 EXPORT_SYMBOL(snd_timer_open);
336
337 /*
338 * close a timer instance
339 * call this with register_mutex down.
340 */
341 static int snd_timer_close_locked(struct snd_timer_instance *timeri)
342 {
343 struct snd_timer *timer = timeri->timer;
344 struct snd_timer_instance *slave, *tmp;
345
346 if (timer) {
347 spin_lock_irq(&timer->lock);
348 timeri->flags |= SNDRV_TIMER_IFLG_DEAD;
349 spin_unlock_irq(&timer->lock);
350 }
351
352 list_del(&timeri->open_list);
353
354 /* force to stop the timer */
355 snd_timer_stop(timeri);
356
357 if (timer) {
358 timer->num_instances--;
359 /* wait, until the active callback is finished */
360 spin_lock_irq(&timer->lock);
361 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
362 spin_unlock_irq(&timer->lock);
363 udelay(10);
364 spin_lock_irq(&timer->lock);
365 }
366 spin_unlock_irq(&timer->lock);
367
368 /* remove slave links */
369 spin_lock_irq(&slave_active_lock);
370 spin_lock(&timer->lock);
371 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
372 open_list) {
373 list_move_tail(&slave->open_list, &snd_timer_slave_list);
374 timer->num_instances--;
375 slave->master = NULL;
376 slave->timer = NULL;
377 list_del_init(&slave->ack_list);
378 list_del_init(&slave->active_list);
379 }
380 spin_unlock(&timer->lock);
381 spin_unlock_irq(&slave_active_lock);
382
383 /* slave doesn't need to release timer resources below */
384 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
385 timer = NULL;
386 }
387
388 if (timeri->private_free)
389 timeri->private_free(timeri);
390 kfree(timeri->owner);
391 kfree(timeri);
392
393 if (timer) {
394 if (list_empty(&timer->open_list_head) && timer->hw.close)
395 timer->hw.close(timer);
396 /* release a card refcount for safe disconnection */
397 if (timer->card)
398 put_device(&timer->card->card_dev);
399 module_put(timer->module);
400 }
401
402 return 0;
403 }
404
405 /*
406 * close a timer instance
407 */
408 int snd_timer_close(struct snd_timer_instance *timeri)
409 {
410 int err;
411
412 if (snd_BUG_ON(!timeri))
413 return -ENXIO;
414
415 mutex_lock(&register_mutex);
416 err = snd_timer_close_locked(timeri);
417 mutex_unlock(&register_mutex);
418 return err;
419 }
420 EXPORT_SYMBOL(snd_timer_close);
421
422 static unsigned long snd_timer_hw_resolution(struct snd_timer *timer)
423 {
424 if (timer->hw.c_resolution)
425 return timer->hw.c_resolution(timer);
426 else
427 return timer->hw.resolution;
428 }
429
430 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
431 {
432 struct snd_timer * timer;
433 unsigned long ret = 0;
434 unsigned long flags;
435
436 if (timeri == NULL)
437 return 0;
438 timer = timeri->timer;
439 if (timer) {
440 spin_lock_irqsave(&timer->lock, flags);
441 ret = snd_timer_hw_resolution(timer);
442 spin_unlock_irqrestore(&timer->lock, flags);
443 }
444 return ret;
445 }
446 EXPORT_SYMBOL(snd_timer_resolution);
447
448 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
449 {
450 struct snd_timer *timer = ti->timer;
451 unsigned long resolution = 0;
452 struct snd_timer_instance *ts;
453 struct timespec tstamp;
454
455 if (timer_tstamp_monotonic)
456 ktime_get_ts(&tstamp);
457 else
458 getnstimeofday(&tstamp);
459 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
460 event > SNDRV_TIMER_EVENT_PAUSE))
461 return;
462 if (timer &&
463 (event == SNDRV_TIMER_EVENT_START ||
464 event == SNDRV_TIMER_EVENT_CONTINUE))
465 resolution = snd_timer_hw_resolution(timer);
466 if (ti->ccallback)
467 ti->ccallback(ti, event, &tstamp, resolution);
468 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
469 return;
470 if (timer == NULL)
471 return;
472 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
473 return;
474 list_for_each_entry(ts, &ti->slave_active_head, active_list)
475 if (ts->ccallback)
476 ts->ccallback(ts, event + 100, &tstamp, resolution);
477 }
478
479 /* start/continue a master timer */
480 static int snd_timer_start1(struct snd_timer_instance *timeri,
481 bool start, unsigned long ticks)
482 {
483 struct snd_timer *timer;
484 int result;
485 unsigned long flags;
486
487 timer = timeri->timer;
488 if (!timer)
489 return -EINVAL;
490
491 spin_lock_irqsave(&timer->lock, flags);
492 if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
493 result = -EINVAL;
494 goto unlock;
495 }
496 if (timer->card && timer->card->shutdown) {
497 result = -ENODEV;
498 goto unlock;
499 }
500 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
501 SNDRV_TIMER_IFLG_START)) {
502 result = -EBUSY;
503 goto unlock;
504 }
505
506 if (start)
507 timeri->ticks = timeri->cticks = ticks;
508 else if (!timeri->cticks)
509 timeri->cticks = 1;
510 timeri->pticks = 0;
511
512 list_move_tail(&timeri->active_list, &timer->active_list_head);
513 if (timer->running) {
514 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
515 goto __start_now;
516 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
517 timeri->flags |= SNDRV_TIMER_IFLG_START;
518 result = 1; /* delayed start */
519 } else {
520 if (start)
521 timer->sticks = ticks;
522 timer->hw.start(timer);
523 __start_now:
524 timer->running++;
525 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
526 result = 0;
527 }
528 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
529 SNDRV_TIMER_EVENT_CONTINUE);
530 unlock:
531 spin_unlock_irqrestore(&timer->lock, flags);
532 return result;
533 }
534
535 /* start/continue a slave timer */
536 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
537 bool start)
538 {
539 unsigned long flags;
540 int err;
541
542 spin_lock_irqsave(&slave_active_lock, flags);
543 if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
544 err = -EINVAL;
545 goto unlock;
546 }
547 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
548 err = -EBUSY;
549 goto unlock;
550 }
551 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
552 if (timeri->master && timeri->timer) {
553 spin_lock(&timeri->timer->lock);
554 list_add_tail(&timeri->active_list,
555 &timeri->master->slave_active_head);
556 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
557 SNDRV_TIMER_EVENT_CONTINUE);
558 spin_unlock(&timeri->timer->lock);
559 }
560 err = 1; /* delayed start */
561 unlock:
562 spin_unlock_irqrestore(&slave_active_lock, flags);
563 return err;
564 }
565
566 /* stop/pause a master timer */
567 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
568 {
569 struct snd_timer *timer;
570 int result = 0;
571 unsigned long flags;
572
573 timer = timeri->timer;
574 if (!timer)
575 return -EINVAL;
576 spin_lock_irqsave(&timer->lock, flags);
577 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
578 SNDRV_TIMER_IFLG_START))) {
579 result = -EBUSY;
580 goto unlock;
581 }
582 list_del_init(&timeri->ack_list);
583 list_del_init(&timeri->active_list);
584 if (timer->card && timer->card->shutdown)
585 goto unlock;
586 if (stop) {
587 timeri->cticks = timeri->ticks;
588 timeri->pticks = 0;
589 }
590 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
591 !(--timer->running)) {
592 timer->hw.stop(timer);
593 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
594 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
595 snd_timer_reschedule(timer, 0);
596 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
597 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
598 timer->hw.start(timer);
599 }
600 }
601 }
602 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
603 if (stop)
604 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
605 else
606 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
607 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
608 SNDRV_TIMER_EVENT_PAUSE);
609 unlock:
610 spin_unlock_irqrestore(&timer->lock, flags);
611 return result;
612 }
613
614 /* stop/pause a slave timer */
615 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
616 {
617 unsigned long flags;
618
619 spin_lock_irqsave(&slave_active_lock, flags);
620 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
621 spin_unlock_irqrestore(&slave_active_lock, flags);
622 return -EBUSY;
623 }
624 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
625 if (timeri->timer) {
626 spin_lock(&timeri->timer->lock);
627 list_del_init(&timeri->ack_list);
628 list_del_init(&timeri->active_list);
629 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
630 SNDRV_TIMER_EVENT_PAUSE);
631 spin_unlock(&timeri->timer->lock);
632 }
633 spin_unlock_irqrestore(&slave_active_lock, flags);
634 return 0;
635 }
636
637 /*
638 * start the timer instance
639 */
640 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
641 {
642 if (timeri == NULL || ticks < 1)
643 return -EINVAL;
644 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
645 return snd_timer_start_slave(timeri, true);
646 else
647 return snd_timer_start1(timeri, true, ticks);
648 }
649 EXPORT_SYMBOL(snd_timer_start);
650
651 /*
652 * stop the timer instance.
653 *
654 * do not call this from the timer callback!
655 */
656 int snd_timer_stop(struct snd_timer_instance *timeri)
657 {
658 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
659 return snd_timer_stop_slave(timeri, true);
660 else
661 return snd_timer_stop1(timeri, true);
662 }
663 EXPORT_SYMBOL(snd_timer_stop);
664
665 /*
666 * start again.. the tick is kept.
667 */
668 int snd_timer_continue(struct snd_timer_instance *timeri)
669 {
670 /* timer can continue only after pause */
671 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
672 return -EINVAL;
673
674 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
675 return snd_timer_start_slave(timeri, false);
676 else
677 return snd_timer_start1(timeri, false, 0);
678 }
679 EXPORT_SYMBOL(snd_timer_continue);
680
681 /*
682 * pause.. remember the ticks left
683 */
684 int snd_timer_pause(struct snd_timer_instance * timeri)
685 {
686 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
687 return snd_timer_stop_slave(timeri, false);
688 else
689 return snd_timer_stop1(timeri, false);
690 }
691 EXPORT_SYMBOL(snd_timer_pause);
692
693 /*
694 * reschedule the timer
695 *
696 * start pending instances and check the scheduling ticks.
697 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
698 */
699 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
700 {
701 struct snd_timer_instance *ti;
702 unsigned long ticks = ~0UL;
703
704 list_for_each_entry(ti, &timer->active_list_head, active_list) {
705 if (ti->flags & SNDRV_TIMER_IFLG_START) {
706 ti->flags &= ~SNDRV_TIMER_IFLG_START;
707 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
708 timer->running++;
709 }
710 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
711 if (ticks > ti->cticks)
712 ticks = ti->cticks;
713 }
714 }
715 if (ticks == ~0UL) {
716 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
717 return;
718 }
719 if (ticks > timer->hw.ticks)
720 ticks = timer->hw.ticks;
721 if (ticks_left != ticks)
722 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
723 timer->sticks = ticks;
724 }
725
726 /* call callbacks in timer ack list */
727 static void snd_timer_process_callbacks(struct snd_timer *timer,
728 struct list_head *head)
729 {
730 struct snd_timer_instance *ti;
731 unsigned long resolution, ticks;
732
733 while (!list_empty(head)) {
734 ti = list_first_entry(head, struct snd_timer_instance,
735 ack_list);
736
737 /* remove from ack_list and make empty */
738 list_del_init(&ti->ack_list);
739
740 if (!(ti->flags & SNDRV_TIMER_IFLG_DEAD)) {
741 ticks = ti->pticks;
742 ti->pticks = 0;
743 resolution = ti->resolution;
744 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
745 spin_unlock(&timer->lock);
746 if (ti->callback)
747 ti->callback(ti, resolution, ticks);
748 spin_lock(&timer->lock);
749 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
750 }
751 }
752 }
753
754 /* clear pending instances from ack list */
755 static void snd_timer_clear_callbacks(struct snd_timer *timer,
756 struct list_head *head)
757 {
758 unsigned long flags;
759
760 spin_lock_irqsave(&timer->lock, flags);
761 while (!list_empty(head))
762 list_del_init(head->next);
763 spin_unlock_irqrestore(&timer->lock, flags);
764 }
765
766 /*
767 * timer tasklet
768 *
769 */
770 static void snd_timer_tasklet(unsigned long arg)
771 {
772 struct snd_timer *timer = (struct snd_timer *) arg;
773 unsigned long flags;
774
775 if (timer->card && timer->card->shutdown) {
776 snd_timer_clear_callbacks(timer, &timer->sack_list_head);
777 return;
778 }
779
780 spin_lock_irqsave(&timer->lock, flags);
781 snd_timer_process_callbacks(timer, &timer->sack_list_head);
782 spin_unlock_irqrestore(&timer->lock, flags);
783 }
784
785 /*
786 * timer interrupt
787 *
788 * ticks_left is usually equal to timer->sticks.
789 *
790 */
791 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
792 {
793 struct snd_timer_instance *ti, *ts, *tmp;
794 unsigned long resolution;
795 struct list_head *ack_list_head;
796 unsigned long flags;
797 int use_tasklet = 0;
798
799 if (timer == NULL)
800 return;
801
802 if (timer->card && timer->card->shutdown) {
803 snd_timer_clear_callbacks(timer, &timer->ack_list_head);
804 return;
805 }
806
807 spin_lock_irqsave(&timer->lock, flags);
808
809 /* remember the current resolution */
810 resolution = snd_timer_hw_resolution(timer);
811
812 /* loop for all active instances
813 * Here we cannot use list_for_each_entry because the active_list of a
814 * processed instance is relinked to done_list_head before the callback
815 * is called.
816 */
817 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
818 active_list) {
819 if (ti->flags & SNDRV_TIMER_IFLG_DEAD)
820 continue;
821 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
822 continue;
823 ti->pticks += ticks_left;
824 ti->resolution = resolution;
825 if (ti->cticks < ticks_left)
826 ti->cticks = 0;
827 else
828 ti->cticks -= ticks_left;
829 if (ti->cticks) /* not expired */
830 continue;
831 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
832 ti->cticks = ti->ticks;
833 } else {
834 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
835 --timer->running;
836 list_del_init(&ti->active_list);
837 }
838 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
839 (ti->flags & SNDRV_TIMER_IFLG_FAST))
840 ack_list_head = &timer->ack_list_head;
841 else
842 ack_list_head = &timer->sack_list_head;
843 if (list_empty(&ti->ack_list))
844 list_add_tail(&ti->ack_list, ack_list_head);
845 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
846 ts->pticks = ti->pticks;
847 ts->resolution = resolution;
848 if (list_empty(&ts->ack_list))
849 list_add_tail(&ts->ack_list, ack_list_head);
850 }
851 }
852 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
853 snd_timer_reschedule(timer, timer->sticks);
854 if (timer->running) {
855 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
856 timer->hw.stop(timer);
857 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
858 }
859 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
860 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
861 /* restart timer */
862 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
863 timer->hw.start(timer);
864 }
865 } else {
866 timer->hw.stop(timer);
867 }
868
869 /* now process all fast callbacks */
870 snd_timer_process_callbacks(timer, &timer->ack_list_head);
871
872 /* do we have any slow callbacks? */
873 use_tasklet = !list_empty(&timer->sack_list_head);
874 spin_unlock_irqrestore(&timer->lock, flags);
875
876 if (use_tasklet)
877 tasklet_schedule(&timer->task_queue);
878 }
879 EXPORT_SYMBOL(snd_timer_interrupt);
880
881 /*
882
883 */
884
885 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
886 struct snd_timer **rtimer)
887 {
888 struct snd_timer *timer;
889 int err;
890 static struct snd_device_ops ops = {
891 .dev_free = snd_timer_dev_free,
892 .dev_register = snd_timer_dev_register,
893 .dev_disconnect = snd_timer_dev_disconnect,
894 };
895
896 if (snd_BUG_ON(!tid))
897 return -EINVAL;
898 if (tid->dev_class == SNDRV_TIMER_CLASS_CARD ||
899 tid->dev_class == SNDRV_TIMER_CLASS_PCM) {
900 if (WARN_ON(!card))
901 return -EINVAL;
902 }
903 if (rtimer)
904 *rtimer = NULL;
905 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
906 if (!timer)
907 return -ENOMEM;
908 timer->tmr_class = tid->dev_class;
909 timer->card = card;
910 timer->tmr_device = tid->device;
911 timer->tmr_subdevice = tid->subdevice;
912 if (id)
913 strlcpy(timer->id, id, sizeof(timer->id));
914 timer->sticks = 1;
915 INIT_LIST_HEAD(&timer->device_list);
916 INIT_LIST_HEAD(&timer->open_list_head);
917 INIT_LIST_HEAD(&timer->active_list_head);
918 INIT_LIST_HEAD(&timer->ack_list_head);
919 INIT_LIST_HEAD(&timer->sack_list_head);
920 spin_lock_init(&timer->lock);
921 tasklet_init(&timer->task_queue, snd_timer_tasklet,
922 (unsigned long)timer);
923 timer->max_instances = 1000; /* default limit per timer */
924 if (card != NULL) {
925 timer->module = card->module;
926 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
927 if (err < 0) {
928 snd_timer_free(timer);
929 return err;
930 }
931 }
932 if (rtimer)
933 *rtimer = timer;
934 return 0;
935 }
936 EXPORT_SYMBOL(snd_timer_new);
937
938 static int snd_timer_free(struct snd_timer *timer)
939 {
940 if (!timer)
941 return 0;
942
943 mutex_lock(&register_mutex);
944 if (! list_empty(&timer->open_list_head)) {
945 struct list_head *p, *n;
946 struct snd_timer_instance *ti;
947 pr_warn("ALSA: timer %p is busy?\n", timer);
948 list_for_each_safe(p, n, &timer->open_list_head) {
949 list_del_init(p);
950 ti = list_entry(p, struct snd_timer_instance, open_list);
951 ti->timer = NULL;
952 }
953 }
954 list_del(&timer->device_list);
955 mutex_unlock(&register_mutex);
956
957 if (timer->private_free)
958 timer->private_free(timer);
959 kfree(timer);
960 return 0;
961 }
962
963 static int snd_timer_dev_free(struct snd_device *device)
964 {
965 struct snd_timer *timer = device->device_data;
966 return snd_timer_free(timer);
967 }
968
969 static int snd_timer_dev_register(struct snd_device *dev)
970 {
971 struct snd_timer *timer = dev->device_data;
972 struct snd_timer *timer1;
973
974 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
975 return -ENXIO;
976 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
977 !timer->hw.resolution && timer->hw.c_resolution == NULL)
978 return -EINVAL;
979
980 mutex_lock(&register_mutex);
981 list_for_each_entry(timer1, &snd_timer_list, device_list) {
982 if (timer1->tmr_class > timer->tmr_class)
983 break;
984 if (timer1->tmr_class < timer->tmr_class)
985 continue;
986 if (timer1->card && timer->card) {
987 if (timer1->card->number > timer->card->number)
988 break;
989 if (timer1->card->number < timer->card->number)
990 continue;
991 }
992 if (timer1->tmr_device > timer->tmr_device)
993 break;
994 if (timer1->tmr_device < timer->tmr_device)
995 continue;
996 if (timer1->tmr_subdevice > timer->tmr_subdevice)
997 break;
998 if (timer1->tmr_subdevice < timer->tmr_subdevice)
999 continue;
1000 /* conflicts.. */
1001 mutex_unlock(&register_mutex);
1002 return -EBUSY;
1003 }
1004 list_add_tail(&timer->device_list, &timer1->device_list);
1005 mutex_unlock(&register_mutex);
1006 return 0;
1007 }
1008
1009 static int snd_timer_dev_disconnect(struct snd_device *device)
1010 {
1011 struct snd_timer *timer = device->device_data;
1012 struct snd_timer_instance *ti;
1013
1014 mutex_lock(&register_mutex);
1015 list_del_init(&timer->device_list);
1016 /* wake up pending sleepers */
1017 list_for_each_entry(ti, &timer->open_list_head, open_list) {
1018 if (ti->disconnect)
1019 ti->disconnect(ti);
1020 }
1021 mutex_unlock(&register_mutex);
1022 return 0;
1023 }
1024
1025 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
1026 {
1027 unsigned long flags;
1028 unsigned long resolution = 0;
1029 struct snd_timer_instance *ti, *ts;
1030
1031 if (timer->card && timer->card->shutdown)
1032 return;
1033 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
1034 return;
1035 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
1036 event > SNDRV_TIMER_EVENT_MRESUME))
1037 return;
1038 spin_lock_irqsave(&timer->lock, flags);
1039 if (event == SNDRV_TIMER_EVENT_MSTART ||
1040 event == SNDRV_TIMER_EVENT_MCONTINUE ||
1041 event == SNDRV_TIMER_EVENT_MRESUME)
1042 resolution = snd_timer_hw_resolution(timer);
1043 list_for_each_entry(ti, &timer->active_list_head, active_list) {
1044 if (ti->ccallback)
1045 ti->ccallback(ti, event, tstamp, resolution);
1046 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1047 if (ts->ccallback)
1048 ts->ccallback(ts, event, tstamp, resolution);
1049 }
1050 spin_unlock_irqrestore(&timer->lock, flags);
1051 }
1052 EXPORT_SYMBOL(snd_timer_notify);
1053
1054 /*
1055 * exported functions for global timers
1056 */
1057 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1058 {
1059 struct snd_timer_id tid;
1060
1061 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1062 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1063 tid.card = -1;
1064 tid.device = device;
1065 tid.subdevice = 0;
1066 return snd_timer_new(NULL, id, &tid, rtimer);
1067 }
1068 EXPORT_SYMBOL(snd_timer_global_new);
1069
1070 int snd_timer_global_free(struct snd_timer *timer)
1071 {
1072 return snd_timer_free(timer);
1073 }
1074 EXPORT_SYMBOL(snd_timer_global_free);
1075
1076 int snd_timer_global_register(struct snd_timer *timer)
1077 {
1078 struct snd_device dev;
1079
1080 memset(&dev, 0, sizeof(dev));
1081 dev.device_data = timer;
1082 return snd_timer_dev_register(&dev);
1083 }
1084 EXPORT_SYMBOL(snd_timer_global_register);
1085
1086 /*
1087 * System timer
1088 */
1089
1090 struct snd_timer_system_private {
1091 struct timer_list tlist;
1092 struct snd_timer *snd_timer;
1093 unsigned long last_expires;
1094 unsigned long last_jiffies;
1095 unsigned long correction;
1096 };
1097
1098 static void snd_timer_s_function(struct timer_list *t)
1099 {
1100 struct snd_timer_system_private *priv = from_timer(priv, t,
1101 tlist);
1102 struct snd_timer *timer = priv->snd_timer;
1103 unsigned long jiff = jiffies;
1104 if (time_after(jiff, priv->last_expires))
1105 priv->correction += (long)jiff - (long)priv->last_expires;
1106 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1107 }
1108
1109 static int snd_timer_s_start(struct snd_timer * timer)
1110 {
1111 struct snd_timer_system_private *priv;
1112 unsigned long njiff;
1113
1114 priv = (struct snd_timer_system_private *) timer->private_data;
1115 njiff = (priv->last_jiffies = jiffies);
1116 if (priv->correction > timer->sticks - 1) {
1117 priv->correction -= timer->sticks - 1;
1118 njiff++;
1119 } else {
1120 njiff += timer->sticks - priv->correction;
1121 priv->correction = 0;
1122 }
1123 priv->last_expires = njiff;
1124 mod_timer(&priv->tlist, njiff);
1125 return 0;
1126 }
1127
1128 static int snd_timer_s_stop(struct snd_timer * timer)
1129 {
1130 struct snd_timer_system_private *priv;
1131 unsigned long jiff;
1132
1133 priv = (struct snd_timer_system_private *) timer->private_data;
1134 del_timer(&priv->tlist);
1135 jiff = jiffies;
1136 if (time_before(jiff, priv->last_expires))
1137 timer->sticks = priv->last_expires - jiff;
1138 else
1139 timer->sticks = 1;
1140 priv->correction = 0;
1141 return 0;
1142 }
1143
1144 static int snd_timer_s_close(struct snd_timer *timer)
1145 {
1146 struct snd_timer_system_private *priv;
1147
1148 priv = (struct snd_timer_system_private *)timer->private_data;
1149 del_timer_sync(&priv->tlist);
1150 return 0;
1151 }
1152
1153 static struct snd_timer_hardware snd_timer_system =
1154 {
1155 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1156 .resolution = 1000000000L / HZ,
1157 .ticks = 10000000L,
1158 .close = snd_timer_s_close,
1159 .start = snd_timer_s_start,
1160 .stop = snd_timer_s_stop
1161 };
1162
1163 static void snd_timer_free_system(struct snd_timer *timer)
1164 {
1165 kfree(timer->private_data);
1166 }
1167
1168 static int snd_timer_register_system(void)
1169 {
1170 struct snd_timer *timer;
1171 struct snd_timer_system_private *priv;
1172 int err;
1173
1174 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1175 if (err < 0)
1176 return err;
1177 strcpy(timer->name, "system timer");
1178 timer->hw = snd_timer_system;
1179 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1180 if (priv == NULL) {
1181 snd_timer_free(timer);
1182 return -ENOMEM;
1183 }
1184 priv->snd_timer = timer;
1185 timer_setup(&priv->tlist, snd_timer_s_function, 0);
1186 timer->private_data = priv;
1187 timer->private_free = snd_timer_free_system;
1188 return snd_timer_global_register(timer);
1189 }
1190
1191 #ifdef CONFIG_SND_PROC_FS
1192 /*
1193 * Info interface
1194 */
1195
1196 static void snd_timer_proc_read(struct snd_info_entry *entry,
1197 struct snd_info_buffer *buffer)
1198 {
1199 struct snd_timer *timer;
1200 struct snd_timer_instance *ti;
1201
1202 mutex_lock(&register_mutex);
1203 list_for_each_entry(timer, &snd_timer_list, device_list) {
1204 if (timer->card && timer->card->shutdown)
1205 continue;
1206 switch (timer->tmr_class) {
1207 case SNDRV_TIMER_CLASS_GLOBAL:
1208 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1209 break;
1210 case SNDRV_TIMER_CLASS_CARD:
1211 snd_iprintf(buffer, "C%i-%i: ",
1212 timer->card->number, timer->tmr_device);
1213 break;
1214 case SNDRV_TIMER_CLASS_PCM:
1215 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1216 timer->tmr_device, timer->tmr_subdevice);
1217 break;
1218 default:
1219 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1220 timer->card ? timer->card->number : -1,
1221 timer->tmr_device, timer->tmr_subdevice);
1222 }
1223 snd_iprintf(buffer, "%s :", timer->name);
1224 if (timer->hw.resolution)
1225 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1226 timer->hw.resolution / 1000,
1227 timer->hw.resolution % 1000,
1228 timer->hw.ticks);
1229 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1230 snd_iprintf(buffer, " SLAVE");
1231 snd_iprintf(buffer, "\n");
1232 list_for_each_entry(ti, &timer->open_list_head, open_list)
1233 snd_iprintf(buffer, " Client %s : %s\n",
1234 ti->owner ? ti->owner : "unknown",
1235 ti->flags & (SNDRV_TIMER_IFLG_START |
1236 SNDRV_TIMER_IFLG_RUNNING)
1237 ? "running" : "stopped");
1238 }
1239 mutex_unlock(&register_mutex);
1240 }
1241
1242 static struct snd_info_entry *snd_timer_proc_entry;
1243
1244 static void __init snd_timer_proc_init(void)
1245 {
1246 struct snd_info_entry *entry;
1247
1248 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1249 if (entry != NULL) {
1250 entry->c.text.read = snd_timer_proc_read;
1251 if (snd_info_register(entry) < 0) {
1252 snd_info_free_entry(entry);
1253 entry = NULL;
1254 }
1255 }
1256 snd_timer_proc_entry = entry;
1257 }
1258
1259 static void __exit snd_timer_proc_done(void)
1260 {
1261 snd_info_free_entry(snd_timer_proc_entry);
1262 }
1263 #else /* !CONFIG_SND_PROC_FS */
1264 #define snd_timer_proc_init()
1265 #define snd_timer_proc_done()
1266 #endif
1267
1268 /*
1269 * USER SPACE interface
1270 */
1271
1272 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1273 unsigned long resolution,
1274 unsigned long ticks)
1275 {
1276 struct snd_timer_user *tu = timeri->callback_data;
1277 struct snd_timer_read *r;
1278 int prev;
1279
1280 spin_lock(&tu->qlock);
1281 if (tu->qused > 0) {
1282 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1283 r = &tu->queue[prev];
1284 if (r->resolution == resolution) {
1285 r->ticks += ticks;
1286 goto __wake;
1287 }
1288 }
1289 if (tu->qused >= tu->queue_size) {
1290 tu->overrun++;
1291 } else {
1292 r = &tu->queue[tu->qtail++];
1293 tu->qtail %= tu->queue_size;
1294 r->resolution = resolution;
1295 r->ticks = ticks;
1296 tu->qused++;
1297 }
1298 __wake:
1299 spin_unlock(&tu->qlock);
1300 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1301 wake_up(&tu->qchange_sleep);
1302 }
1303
1304 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1305 struct snd_timer_tread *tread)
1306 {
1307 if (tu->qused >= tu->queue_size) {
1308 tu->overrun++;
1309 } else {
1310 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1311 tu->qtail %= tu->queue_size;
1312 tu->qused++;
1313 }
1314 }
1315
1316 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1317 int event,
1318 struct timespec *tstamp,
1319 unsigned long resolution)
1320 {
1321 struct snd_timer_user *tu = timeri->callback_data;
1322 struct snd_timer_tread r1;
1323 unsigned long flags;
1324
1325 if (event >= SNDRV_TIMER_EVENT_START &&
1326 event <= SNDRV_TIMER_EVENT_PAUSE)
1327 tu->tstamp = *tstamp;
1328 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1329 return;
1330 memset(&r1, 0, sizeof(r1));
1331 r1.event = event;
1332 r1.tstamp = *tstamp;
1333 r1.val = resolution;
1334 spin_lock_irqsave(&tu->qlock, flags);
1335 snd_timer_user_append_to_tqueue(tu, &r1);
1336 spin_unlock_irqrestore(&tu->qlock, flags);
1337 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1338 wake_up(&tu->qchange_sleep);
1339 }
1340
1341 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1342 {
1343 struct snd_timer_user *tu = timeri->callback_data;
1344
1345 tu->disconnected = true;
1346 wake_up(&tu->qchange_sleep);
1347 }
1348
1349 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1350 unsigned long resolution,
1351 unsigned long ticks)
1352 {
1353 struct snd_timer_user *tu = timeri->callback_data;
1354 struct snd_timer_tread *r, r1;
1355 struct timespec tstamp;
1356 int prev, append = 0;
1357
1358 memset(&r1, 0, sizeof(r1));
1359 memset(&tstamp, 0, sizeof(tstamp));
1360 spin_lock(&tu->qlock);
1361 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1362 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1363 spin_unlock(&tu->qlock);
1364 return;
1365 }
1366 if (tu->last_resolution != resolution || ticks > 0) {
1367 if (timer_tstamp_monotonic)
1368 ktime_get_ts(&tstamp);
1369 else
1370 getnstimeofday(&tstamp);
1371 }
1372 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1373 tu->last_resolution != resolution) {
1374 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1375 r1.tstamp = tstamp;
1376 r1.val = resolution;
1377 snd_timer_user_append_to_tqueue(tu, &r1);
1378 tu->last_resolution = resolution;
1379 append++;
1380 }
1381 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1382 goto __wake;
1383 if (ticks == 0)
1384 goto __wake;
1385 if (tu->qused > 0) {
1386 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1387 r = &tu->tqueue[prev];
1388 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1389 r->tstamp = tstamp;
1390 r->val += ticks;
1391 append++;
1392 goto __wake;
1393 }
1394 }
1395 r1.event = SNDRV_TIMER_EVENT_TICK;
1396 r1.tstamp = tstamp;
1397 r1.val = ticks;
1398 snd_timer_user_append_to_tqueue(tu, &r1);
1399 append++;
1400 __wake:
1401 spin_unlock(&tu->qlock);
1402 if (append == 0)
1403 return;
1404 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1405 wake_up(&tu->qchange_sleep);
1406 }
1407
1408 static int realloc_user_queue(struct snd_timer_user *tu, int size)
1409 {
1410 struct snd_timer_read *queue = NULL;
1411 struct snd_timer_tread *tqueue = NULL;
1412
1413 if (tu->tread) {
1414 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1415 if (!tqueue)
1416 return -ENOMEM;
1417 } else {
1418 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1419 if (!queue)
1420 return -ENOMEM;
1421 }
1422
1423 spin_lock_irq(&tu->qlock);
1424 kfree(tu->queue);
1425 kfree(tu->tqueue);
1426 tu->queue_size = size;
1427 tu->queue = queue;
1428 tu->tqueue = tqueue;
1429 tu->qhead = tu->qtail = tu->qused = 0;
1430 spin_unlock_irq(&tu->qlock);
1431
1432 return 0;
1433 }
1434
1435 static int snd_timer_user_open(struct inode *inode, struct file *file)
1436 {
1437 struct snd_timer_user *tu;
1438 int err;
1439
1440 err = stream_open(inode, file);
1441 if (err < 0)
1442 return err;
1443
1444 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1445 if (tu == NULL)
1446 return -ENOMEM;
1447 spin_lock_init(&tu->qlock);
1448 init_waitqueue_head(&tu->qchange_sleep);
1449 mutex_init(&tu->ioctl_lock);
1450 tu->ticks = 1;
1451 if (realloc_user_queue(tu, 128) < 0) {
1452 kfree(tu);
1453 return -ENOMEM;
1454 }
1455 file->private_data = tu;
1456 return 0;
1457 }
1458
1459 static int snd_timer_user_release(struct inode *inode, struct file *file)
1460 {
1461 struct snd_timer_user *tu;
1462
1463 if (file->private_data) {
1464 tu = file->private_data;
1465 file->private_data = NULL;
1466 mutex_lock(&tu->ioctl_lock);
1467 if (tu->timeri)
1468 snd_timer_close(tu->timeri);
1469 mutex_unlock(&tu->ioctl_lock);
1470 kfree(tu->queue);
1471 kfree(tu->tqueue);
1472 kfree(tu);
1473 }
1474 return 0;
1475 }
1476
1477 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1478 {
1479 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1480 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1481 id->card = -1;
1482 id->device = -1;
1483 id->subdevice = -1;
1484 }
1485
1486 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1487 {
1488 id->dev_class = timer->tmr_class;
1489 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1490 id->card = timer->card ? timer->card->number : -1;
1491 id->device = timer->tmr_device;
1492 id->subdevice = timer->tmr_subdevice;
1493 }
1494
1495 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1496 {
1497 struct snd_timer_id id;
1498 struct snd_timer *timer;
1499 struct list_head *p;
1500
1501 if (copy_from_user(&id, _tid, sizeof(id)))
1502 return -EFAULT;
1503 mutex_lock(&register_mutex);
1504 if (id.dev_class < 0) { /* first item */
1505 if (list_empty(&snd_timer_list))
1506 snd_timer_user_zero_id(&id);
1507 else {
1508 timer = list_entry(snd_timer_list.next,
1509 struct snd_timer, device_list);
1510 snd_timer_user_copy_id(&id, timer);
1511 }
1512 } else {
1513 switch (id.dev_class) {
1514 case SNDRV_TIMER_CLASS_GLOBAL:
1515 id.device = id.device < 0 ? 0 : id.device + 1;
1516 list_for_each(p, &snd_timer_list) {
1517 timer = list_entry(p, struct snd_timer, device_list);
1518 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1519 snd_timer_user_copy_id(&id, timer);
1520 break;
1521 }
1522 if (timer->tmr_device >= id.device) {
1523 snd_timer_user_copy_id(&id, timer);
1524 break;
1525 }
1526 }
1527 if (p == &snd_timer_list)
1528 snd_timer_user_zero_id(&id);
1529 break;
1530 case SNDRV_TIMER_CLASS_CARD:
1531 case SNDRV_TIMER_CLASS_PCM:
1532 if (id.card < 0) {
1533 id.card = 0;
1534 } else {
1535 if (id.device < 0) {
1536 id.device = 0;
1537 } else {
1538 if (id.subdevice < 0)
1539 id.subdevice = 0;
1540 else if (id.subdevice < INT_MAX)
1541 id.subdevice++;
1542 }
1543 }
1544 list_for_each(p, &snd_timer_list) {
1545 timer = list_entry(p, struct snd_timer, device_list);
1546 if (timer->tmr_class > id.dev_class) {
1547 snd_timer_user_copy_id(&id, timer);
1548 break;
1549 }
1550 if (timer->tmr_class < id.dev_class)
1551 continue;
1552 if (timer->card->number > id.card) {
1553 snd_timer_user_copy_id(&id, timer);
1554 break;
1555 }
1556 if (timer->card->number < id.card)
1557 continue;
1558 if (timer->tmr_device > id.device) {
1559 snd_timer_user_copy_id(&id, timer);
1560 break;
1561 }
1562 if (timer->tmr_device < id.device)
1563 continue;
1564 if (timer->tmr_subdevice > id.subdevice) {
1565 snd_timer_user_copy_id(&id, timer);
1566 break;
1567 }
1568 if (timer->tmr_subdevice < id.subdevice)
1569 continue;
1570 snd_timer_user_copy_id(&id, timer);
1571 break;
1572 }
1573 if (p == &snd_timer_list)
1574 snd_timer_user_zero_id(&id);
1575 break;
1576 default:
1577 snd_timer_user_zero_id(&id);
1578 }
1579 }
1580 mutex_unlock(&register_mutex);
1581 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1582 return -EFAULT;
1583 return 0;
1584 }
1585
1586 static int snd_timer_user_ginfo(struct file *file,
1587 struct snd_timer_ginfo __user *_ginfo)
1588 {
1589 struct snd_timer_ginfo *ginfo;
1590 struct snd_timer_id tid;
1591 struct snd_timer *t;
1592 struct list_head *p;
1593 int err = 0;
1594
1595 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1596 if (IS_ERR(ginfo))
1597 return PTR_ERR(ginfo);
1598
1599 tid = ginfo->tid;
1600 memset(ginfo, 0, sizeof(*ginfo));
1601 ginfo->tid = tid;
1602 mutex_lock(&register_mutex);
1603 t = snd_timer_find(&tid);
1604 if (t != NULL) {
1605 ginfo->card = t->card ? t->card->number : -1;
1606 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1607 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1608 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1609 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1610 ginfo->resolution = t->hw.resolution;
1611 if (t->hw.resolution_min > 0) {
1612 ginfo->resolution_min = t->hw.resolution_min;
1613 ginfo->resolution_max = t->hw.resolution_max;
1614 }
1615 list_for_each(p, &t->open_list_head) {
1616 ginfo->clients++;
1617 }
1618 } else {
1619 err = -ENODEV;
1620 }
1621 mutex_unlock(&register_mutex);
1622 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1623 err = -EFAULT;
1624 kfree(ginfo);
1625 return err;
1626 }
1627
1628 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1629 {
1630 struct snd_timer *t;
1631 int err;
1632
1633 mutex_lock(&register_mutex);
1634 t = snd_timer_find(&gparams->tid);
1635 if (!t) {
1636 err = -ENODEV;
1637 goto _error;
1638 }
1639 if (!list_empty(&t->open_list_head)) {
1640 err = -EBUSY;
1641 goto _error;
1642 }
1643 if (!t->hw.set_period) {
1644 err = -ENOSYS;
1645 goto _error;
1646 }
1647 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1648 _error:
1649 mutex_unlock(&register_mutex);
1650 return err;
1651 }
1652
1653 static int snd_timer_user_gparams(struct file *file,
1654 struct snd_timer_gparams __user *_gparams)
1655 {
1656 struct snd_timer_gparams gparams;
1657
1658 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1659 return -EFAULT;
1660 return timer_set_gparams(&gparams);
1661 }
1662
1663 static int snd_timer_user_gstatus(struct file *file,
1664 struct snd_timer_gstatus __user *_gstatus)
1665 {
1666 struct snd_timer_gstatus gstatus;
1667 struct snd_timer_id tid;
1668 struct snd_timer *t;
1669 int err = 0;
1670
1671 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1672 return -EFAULT;
1673 tid = gstatus.tid;
1674 memset(&gstatus, 0, sizeof(gstatus));
1675 gstatus.tid = tid;
1676 mutex_lock(&register_mutex);
1677 t = snd_timer_find(&tid);
1678 if (t != NULL) {
1679 spin_lock_irq(&t->lock);
1680 gstatus.resolution = snd_timer_hw_resolution(t);
1681 if (t->hw.precise_resolution) {
1682 t->hw.precise_resolution(t, &gstatus.resolution_num,
1683 &gstatus.resolution_den);
1684 } else {
1685 gstatus.resolution_num = gstatus.resolution;
1686 gstatus.resolution_den = 1000000000uL;
1687 }
1688 spin_unlock_irq(&t->lock);
1689 } else {
1690 err = -ENODEV;
1691 }
1692 mutex_unlock(&register_mutex);
1693 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1694 err = -EFAULT;
1695 return err;
1696 }
1697
1698 static int snd_timer_user_tselect(struct file *file,
1699 struct snd_timer_select __user *_tselect)
1700 {
1701 struct snd_timer_user *tu;
1702 struct snd_timer_select tselect;
1703 char str[32];
1704 int err = 0;
1705
1706 tu = file->private_data;
1707 if (tu->timeri) {
1708 snd_timer_close(tu->timeri);
1709 tu->timeri = NULL;
1710 }
1711 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1712 err = -EFAULT;
1713 goto __err;
1714 }
1715 sprintf(str, "application %i", current->pid);
1716 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1717 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1718 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1719 if (err < 0)
1720 goto __err;
1721
1722 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1723 tu->timeri->callback = tu->tread
1724 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1725 tu->timeri->ccallback = snd_timer_user_ccallback;
1726 tu->timeri->callback_data = (void *)tu;
1727 tu->timeri->disconnect = snd_timer_user_disconnect;
1728
1729 __err:
1730 return err;
1731 }
1732
1733 static int snd_timer_user_info(struct file *file,
1734 struct snd_timer_info __user *_info)
1735 {
1736 struct snd_timer_user *tu;
1737 struct snd_timer_info *info;
1738 struct snd_timer *t;
1739 int err = 0;
1740
1741 tu = file->private_data;
1742 if (!tu->timeri)
1743 return -EBADFD;
1744 t = tu->timeri->timer;
1745 if (!t)
1746 return -EBADFD;
1747
1748 info = kzalloc(sizeof(*info), GFP_KERNEL);
1749 if (! info)
1750 return -ENOMEM;
1751 info->card = t->card ? t->card->number : -1;
1752 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1753 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1754 strlcpy(info->id, t->id, sizeof(info->id));
1755 strlcpy(info->name, t->name, sizeof(info->name));
1756 info->resolution = t->hw.resolution;
1757 if (copy_to_user(_info, info, sizeof(*_info)))
1758 err = -EFAULT;
1759 kfree(info);
1760 return err;
1761 }
1762
1763 static int snd_timer_user_params(struct file *file,
1764 struct snd_timer_params __user *_params)
1765 {
1766 struct snd_timer_user *tu;
1767 struct snd_timer_params params;
1768 struct snd_timer *t;
1769 int err;
1770
1771 tu = file->private_data;
1772 if (!tu->timeri)
1773 return -EBADFD;
1774 t = tu->timeri->timer;
1775 if (!t)
1776 return -EBADFD;
1777 if (copy_from_user(&params, _params, sizeof(params)))
1778 return -EFAULT;
1779 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1780 u64 resolution;
1781
1782 if (params.ticks < 1) {
1783 err = -EINVAL;
1784 goto _end;
1785 }
1786
1787 /* Don't allow resolution less than 1ms */
1788 resolution = snd_timer_resolution(tu->timeri);
1789 resolution *= params.ticks;
1790 if (resolution < 1000000) {
1791 err = -EINVAL;
1792 goto _end;
1793 }
1794 }
1795 if (params.queue_size > 0 &&
1796 (params.queue_size < 32 || params.queue_size > 1024)) {
1797 err = -EINVAL;
1798 goto _end;
1799 }
1800 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1801 (1<<SNDRV_TIMER_EVENT_TICK)|
1802 (1<<SNDRV_TIMER_EVENT_START)|
1803 (1<<SNDRV_TIMER_EVENT_STOP)|
1804 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1805 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1806 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1807 (1<<SNDRV_TIMER_EVENT_RESUME)|
1808 (1<<SNDRV_TIMER_EVENT_MSTART)|
1809 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1810 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1811 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1812 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1813 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1814 err = -EINVAL;
1815 goto _end;
1816 }
1817 snd_timer_stop(tu->timeri);
1818 spin_lock_irq(&t->lock);
1819 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1820 SNDRV_TIMER_IFLG_EXCLUSIVE|
1821 SNDRV_TIMER_IFLG_EARLY_EVENT);
1822 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1823 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1824 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1825 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1826 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1827 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1828 spin_unlock_irq(&t->lock);
1829 if (params.queue_size > 0 &&
1830 (unsigned int)tu->queue_size != params.queue_size) {
1831 err = realloc_user_queue(tu, params.queue_size);
1832 if (err < 0)
1833 goto _end;
1834 }
1835 spin_lock_irq(&tu->qlock);
1836 tu->qhead = tu->qtail = tu->qused = 0;
1837 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1838 if (tu->tread) {
1839 struct snd_timer_tread tread;
1840 memset(&tread, 0, sizeof(tread));
1841 tread.event = SNDRV_TIMER_EVENT_EARLY;
1842 tread.tstamp.tv_sec = 0;
1843 tread.tstamp.tv_nsec = 0;
1844 tread.val = 0;
1845 snd_timer_user_append_to_tqueue(tu, &tread);
1846 } else {
1847 struct snd_timer_read *r = &tu->queue[0];
1848 r->resolution = 0;
1849 r->ticks = 0;
1850 tu->qused++;
1851 tu->qtail++;
1852 }
1853 }
1854 tu->filter = params.filter;
1855 tu->ticks = params.ticks;
1856 spin_unlock_irq(&tu->qlock);
1857 err = 0;
1858 _end:
1859 if (copy_to_user(_params, &params, sizeof(params)))
1860 return -EFAULT;
1861 return err;
1862 }
1863
1864 static int snd_timer_user_status(struct file *file,
1865 struct snd_timer_status __user *_status)
1866 {
1867 struct snd_timer_user *tu;
1868 struct snd_timer_status status;
1869
1870 tu = file->private_data;
1871 if (!tu->timeri)
1872 return -EBADFD;
1873 memset(&status, 0, sizeof(status));
1874 status.tstamp = tu->tstamp;
1875 status.resolution = snd_timer_resolution(tu->timeri);
1876 status.lost = tu->timeri->lost;
1877 status.overrun = tu->overrun;
1878 spin_lock_irq(&tu->qlock);
1879 status.queue = tu->qused;
1880 spin_unlock_irq(&tu->qlock);
1881 if (copy_to_user(_status, &status, sizeof(status)))
1882 return -EFAULT;
1883 return 0;
1884 }
1885
1886 static int snd_timer_user_start(struct file *file)
1887 {
1888 int err;
1889 struct snd_timer_user *tu;
1890
1891 tu = file->private_data;
1892 if (!tu->timeri)
1893 return -EBADFD;
1894 snd_timer_stop(tu->timeri);
1895 tu->timeri->lost = 0;
1896 tu->last_resolution = 0;
1897 err = snd_timer_start(tu->timeri, tu->ticks);
1898 if (err < 0)
1899 return err;
1900 return 0;
1901 }
1902
1903 static int snd_timer_user_stop(struct file *file)
1904 {
1905 int err;
1906 struct snd_timer_user *tu;
1907
1908 tu = file->private_data;
1909 if (!tu->timeri)
1910 return -EBADFD;
1911 err = snd_timer_stop(tu->timeri);
1912 if (err < 0)
1913 return err;
1914 return 0;
1915 }
1916
1917 static int snd_timer_user_continue(struct file *file)
1918 {
1919 int err;
1920 struct snd_timer_user *tu;
1921
1922 tu = file->private_data;
1923 if (!tu->timeri)
1924 return -EBADFD;
1925 /* start timer instead of continue if it's not used before */
1926 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1927 return snd_timer_user_start(file);
1928 tu->timeri->lost = 0;
1929 err = snd_timer_continue(tu->timeri);
1930 if (err < 0)
1931 return err;
1932 return 0;
1933 }
1934
1935 static int snd_timer_user_pause(struct file *file)
1936 {
1937 int err;
1938 struct snd_timer_user *tu;
1939
1940 tu = file->private_data;
1941 if (!tu->timeri)
1942 return -EBADFD;
1943 err = snd_timer_pause(tu->timeri);
1944 if (err < 0)
1945 return err;
1946 return 0;
1947 }
1948
1949 enum {
1950 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1951 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1952 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1953 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1954 };
1955
1956 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1957 unsigned long arg)
1958 {
1959 struct snd_timer_user *tu;
1960 void __user *argp = (void __user *)arg;
1961 int __user *p = argp;
1962
1963 tu = file->private_data;
1964 switch (cmd) {
1965 case SNDRV_TIMER_IOCTL_PVERSION:
1966 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1967 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1968 return snd_timer_user_next_device(argp);
1969 case SNDRV_TIMER_IOCTL_TREAD:
1970 {
1971 int xarg, old_tread;
1972
1973 if (tu->timeri) /* too late */
1974 return -EBUSY;
1975 if (get_user(xarg, p))
1976 return -EFAULT;
1977 old_tread = tu->tread;
1978 tu->tread = xarg ? 1 : 0;
1979 if (tu->tread != old_tread &&
1980 realloc_user_queue(tu, tu->queue_size) < 0) {
1981 tu->tread = old_tread;
1982 return -ENOMEM;
1983 }
1984 return 0;
1985 }
1986 case SNDRV_TIMER_IOCTL_GINFO:
1987 return snd_timer_user_ginfo(file, argp);
1988 case SNDRV_TIMER_IOCTL_GPARAMS:
1989 return snd_timer_user_gparams(file, argp);
1990 case SNDRV_TIMER_IOCTL_GSTATUS:
1991 return snd_timer_user_gstatus(file, argp);
1992 case SNDRV_TIMER_IOCTL_SELECT:
1993 return snd_timer_user_tselect(file, argp);
1994 case SNDRV_TIMER_IOCTL_INFO:
1995 return snd_timer_user_info(file, argp);
1996 case SNDRV_TIMER_IOCTL_PARAMS:
1997 return snd_timer_user_params(file, argp);
1998 case SNDRV_TIMER_IOCTL_STATUS:
1999 return snd_timer_user_status(file, argp);
2000 case SNDRV_TIMER_IOCTL_START:
2001 case SNDRV_TIMER_IOCTL_START_OLD:
2002 return snd_timer_user_start(file);
2003 case SNDRV_TIMER_IOCTL_STOP:
2004 case SNDRV_TIMER_IOCTL_STOP_OLD:
2005 return snd_timer_user_stop(file);
2006 case SNDRV_TIMER_IOCTL_CONTINUE:
2007 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
2008 return snd_timer_user_continue(file);
2009 case SNDRV_TIMER_IOCTL_PAUSE:
2010 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
2011 return snd_timer_user_pause(file);
2012 }
2013 return -ENOTTY;
2014 }
2015
2016 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
2017 unsigned long arg)
2018 {
2019 struct snd_timer_user *tu = file->private_data;
2020 long ret;
2021
2022 mutex_lock(&tu->ioctl_lock);
2023 ret = __snd_timer_user_ioctl(file, cmd, arg);
2024 mutex_unlock(&tu->ioctl_lock);
2025 return ret;
2026 }
2027
2028 static int snd_timer_user_fasync(int fd, struct file * file, int on)
2029 {
2030 struct snd_timer_user *tu;
2031
2032 tu = file->private_data;
2033 return fasync_helper(fd, file, on, &tu->fasync);
2034 }
2035
2036 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
2037 size_t count, loff_t *offset)
2038 {
2039 struct snd_timer_user *tu;
2040 long result = 0, unit;
2041 int qhead;
2042 int err = 0;
2043
2044 tu = file->private_data;
2045 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
2046 mutex_lock(&tu->ioctl_lock);
2047 spin_lock_irq(&tu->qlock);
2048 while ((long)count - result >= unit) {
2049 while (!tu->qused) {
2050 wait_queue_entry_t wait;
2051
2052 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
2053 err = -EAGAIN;
2054 goto _error;
2055 }
2056
2057 set_current_state(TASK_INTERRUPTIBLE);
2058 init_waitqueue_entry(&wait, current);
2059 add_wait_queue(&tu->qchange_sleep, &wait);
2060
2061 spin_unlock_irq(&tu->qlock);
2062 mutex_unlock(&tu->ioctl_lock);
2063 schedule();
2064 mutex_lock(&tu->ioctl_lock);
2065 spin_lock_irq(&tu->qlock);
2066
2067 remove_wait_queue(&tu->qchange_sleep, &wait);
2068
2069 if (tu->disconnected) {
2070 err = -ENODEV;
2071 goto _error;
2072 }
2073 if (signal_pending(current)) {
2074 err = -ERESTARTSYS;
2075 goto _error;
2076 }
2077 }
2078
2079 qhead = tu->qhead++;
2080 tu->qhead %= tu->queue_size;
2081 tu->qused--;
2082 spin_unlock_irq(&tu->qlock);
2083
2084 if (tu->tread) {
2085 if (copy_to_user(buffer, &tu->tqueue[qhead],
2086 sizeof(struct snd_timer_tread)))
2087 err = -EFAULT;
2088 } else {
2089 if (copy_to_user(buffer, &tu->queue[qhead],
2090 sizeof(struct snd_timer_read)))
2091 err = -EFAULT;
2092 }
2093
2094 spin_lock_irq(&tu->qlock);
2095 if (err < 0)
2096 goto _error;
2097 result += unit;
2098 buffer += unit;
2099 }
2100 _error:
2101 spin_unlock_irq(&tu->qlock);
2102 mutex_unlock(&tu->ioctl_lock);
2103 return result > 0 ? result : err;
2104 }
2105
2106 static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait)
2107 {
2108 __poll_t mask;
2109 struct snd_timer_user *tu;
2110
2111 tu = file->private_data;
2112
2113 poll_wait(file, &tu->qchange_sleep, wait);
2114
2115 mask = 0;
2116 spin_lock_irq(&tu->qlock);
2117 if (tu->qused)
2118 mask |= EPOLLIN | EPOLLRDNORM;
2119 if (tu->disconnected)
2120 mask |= EPOLLERR;
2121 spin_unlock_irq(&tu->qlock);
2122
2123 return mask;
2124 }
2125
2126 #ifdef CONFIG_COMPAT
2127 #include "timer_compat.c"
2128 #else
2129 #define snd_timer_user_ioctl_compat NULL
2130 #endif
2131
2132 static const struct file_operations snd_timer_f_ops =
2133 {
2134 .owner = THIS_MODULE,
2135 .read = snd_timer_user_read,
2136 .open = snd_timer_user_open,
2137 .release = snd_timer_user_release,
2138 .llseek = no_llseek,
2139 .poll = snd_timer_user_poll,
2140 .unlocked_ioctl = snd_timer_user_ioctl,
2141 .compat_ioctl = snd_timer_user_ioctl_compat,
2142 .fasync = snd_timer_user_fasync,
2143 };
2144
2145 /* unregister the system timer */
2146 static void snd_timer_free_all(void)
2147 {
2148 struct snd_timer *timer, *n;
2149
2150 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2151 snd_timer_free(timer);
2152 }
2153
2154 static struct device timer_dev;
2155
2156 /*
2157 * ENTRY functions
2158 */
2159
2160 static int __init alsa_timer_init(void)
2161 {
2162 int err;
2163
2164 snd_device_initialize(&timer_dev, NULL);
2165 dev_set_name(&timer_dev, "timer");
2166
2167 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2168 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2169 "system timer");
2170 #endif
2171
2172 err = snd_timer_register_system();
2173 if (err < 0) {
2174 pr_err("ALSA: unable to register system timer (%i)\n", err);
2175 goto put_timer;
2176 }
2177
2178 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2179 &snd_timer_f_ops, NULL, &timer_dev);
2180 if (err < 0) {
2181 pr_err("ALSA: unable to register timer device (%i)\n", err);
2182 snd_timer_free_all();
2183 goto put_timer;
2184 }
2185
2186 snd_timer_proc_init();
2187 return 0;
2188
2189 put_timer:
2190 put_device(&timer_dev);
2191 return err;
2192 }
2193
2194 static void __exit alsa_timer_exit(void)
2195 {
2196 snd_unregister_device(&timer_dev);
2197 snd_timer_free_all();
2198 put_device(&timer_dev);
2199 snd_timer_proc_done();
2200 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2201 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2202 #endif
2203 }
2204
2205 module_init(alsa_timer_init)
2206 module_exit(alsa_timer_exit)
Linux with added FPC-III support