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22#include <linux/delay.h>
23#include <linux/init.h>
24#include <linux/slab.h>
25#include <linux/time.h>
26#include <linux/mutex.h>
27#include <linux/device.h>
28#include <linux/module.h>
29#include <linux/string.h>
30#include <sound/core.h>
31#include <sound/timer.h>
32#include <sound/control.h>
33#include <sound/info.h>
34#include <sound/minors.h>
35#include <sound/initval.h>
36#include <linux/kmod.h>
37
38#if IS_ENABLED(CONFIG_SND_HRTIMER)
39#define DEFAULT_TIMER_LIMIT 4
40#elif IS_ENABLED(CONFIG_SND_RTCTIMER)
41#define DEFAULT_TIMER_LIMIT 2
42#else
43#define DEFAULT_TIMER_LIMIT 1
44#endif
45
46static int timer_limit = DEFAULT_TIMER_LIMIT;
47static int timer_tstamp_monotonic = 1;
48MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
49MODULE_DESCRIPTION("ALSA timer interface");
50MODULE_LICENSE("GPL");
51module_param(timer_limit, int, 0444);
52MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
53module_param(timer_tstamp_monotonic, int, 0444);
54MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
55
56MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
57MODULE_ALIAS("devname:snd/timer");
58
59struct snd_timer_user {
60 struct snd_timer_instance *timeri;
61 int tread;
62 unsigned long ticks;
63 unsigned long overrun;
64 int qhead;
65 int qtail;
66 int qused;
67 int queue_size;
68 struct snd_timer_read *queue;
69 struct snd_timer_tread *tqueue;
70 spinlock_t qlock;
71 unsigned long last_resolution;
72 unsigned int filter;
73 struct timespec tstamp;
74 wait_queue_head_t qchange_sleep;
75 struct fasync_struct *fasync;
76 struct mutex tread_sem;
77};
78
79
80static LIST_HEAD(snd_timer_list);
81
82
83static LIST_HEAD(snd_timer_slave_list);
84
85
86static DEFINE_SPINLOCK(slave_active_lock);
87
88static DEFINE_MUTEX(register_mutex);
89
90static int snd_timer_free(struct snd_timer *timer);
91static int snd_timer_dev_free(struct snd_device *device);
92static int snd_timer_dev_register(struct snd_device *device);
93static int snd_timer_dev_disconnect(struct snd_device *device);
94
95static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
96
97
98
99
100
101static struct snd_timer_instance *snd_timer_instance_new(char *owner,
102 struct snd_timer *timer)
103{
104 struct snd_timer_instance *timeri;
105 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
106 if (timeri == NULL)
107 return NULL;
108 timeri->owner = kstrdup(owner, GFP_KERNEL);
109 if (! timeri->owner) {
110 kfree(timeri);
111 return NULL;
112 }
113 INIT_LIST_HEAD(&timeri->open_list);
114 INIT_LIST_HEAD(&timeri->active_list);
115 INIT_LIST_HEAD(&timeri->ack_list);
116 INIT_LIST_HEAD(&timeri->slave_list_head);
117 INIT_LIST_HEAD(&timeri->slave_active_head);
118
119 timeri->timer = timer;
120 if (timer && !try_module_get(timer->module)) {
121 kfree(timeri->owner);
122 kfree(timeri);
123 return NULL;
124 }
125
126 return timeri;
127}
128
129
130
131
132static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
133{
134 struct snd_timer *timer = NULL;
135
136 list_for_each_entry(timer, &snd_timer_list, device_list) {
137 if (timer->tmr_class != tid->dev_class)
138 continue;
139 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
140 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
141 (timer->card == NULL ||
142 timer->card->number != tid->card))
143 continue;
144 if (timer->tmr_device != tid->device)
145 continue;
146 if (timer->tmr_subdevice != tid->subdevice)
147 continue;
148 return timer;
149 }
150 return NULL;
151}
152
153#ifdef CONFIG_MODULES
154
155static void snd_timer_request(struct snd_timer_id *tid)
156{
157 switch (tid->dev_class) {
158 case SNDRV_TIMER_CLASS_GLOBAL:
159 if (tid->device < timer_limit)
160 request_module("snd-timer-%i", tid->device);
161 break;
162 case SNDRV_TIMER_CLASS_CARD:
163 case SNDRV_TIMER_CLASS_PCM:
164 if (tid->card < snd_ecards_limit)
165 request_module("snd-card-%i", tid->card);
166 break;
167 default:
168 break;
169 }
170}
171
172#endif
173
174
175
176
177
178
179
180static void snd_timer_check_slave(struct snd_timer_instance *slave)
181{
182 struct snd_timer *timer;
183 struct snd_timer_instance *master;
184
185
186 list_for_each_entry(timer, &snd_timer_list, device_list) {
187 list_for_each_entry(master, &timer->open_list_head, open_list) {
188 if (slave->slave_class == master->slave_class &&
189 slave->slave_id == master->slave_id) {
190 list_move_tail(&slave->open_list,
191 &master->slave_list_head);
192 spin_lock_irq(&slave_active_lock);
193 slave->master = master;
194 slave->timer = master->timer;
195 spin_unlock_irq(&slave_active_lock);
196 return;
197 }
198 }
199 }
200}
201
202
203
204
205
206
207
208static void snd_timer_check_master(struct snd_timer_instance *master)
209{
210 struct snd_timer_instance *slave, *tmp;
211
212
213 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
214 if (slave->slave_class == master->slave_class &&
215 slave->slave_id == master->slave_id) {
216 list_move_tail(&slave->open_list, &master->slave_list_head);
217 spin_lock_irq(&slave_active_lock);
218 slave->master = master;
219 slave->timer = master->timer;
220 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
221 list_add_tail(&slave->active_list,
222 &master->slave_active_head);
223 spin_unlock_irq(&slave_active_lock);
224 }
225 }
226}
227
228
229
230
231
232int snd_timer_open(struct snd_timer_instance **ti,
233 char *owner, struct snd_timer_id *tid,
234 unsigned int slave_id)
235{
236 struct snd_timer *timer;
237 struct snd_timer_instance *timeri = NULL;
238
239 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
240
241 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
242 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
243 pr_debug("ALSA: timer: invalid slave class %i\n",
244 tid->dev_sclass);
245 return -EINVAL;
246 }
247 mutex_lock(®ister_mutex);
248 timeri = snd_timer_instance_new(owner, NULL);
249 if (!timeri) {
250 mutex_unlock(®ister_mutex);
251 return -ENOMEM;
252 }
253 timeri->slave_class = tid->dev_sclass;
254 timeri->slave_id = tid->device;
255 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
256 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
257 snd_timer_check_slave(timeri);
258 mutex_unlock(®ister_mutex);
259 *ti = timeri;
260 return 0;
261 }
262
263
264 mutex_lock(®ister_mutex);
265 timer = snd_timer_find(tid);
266#ifdef CONFIG_MODULES
267 if (!timer) {
268 mutex_unlock(®ister_mutex);
269 snd_timer_request(tid);
270 mutex_lock(®ister_mutex);
271 timer = snd_timer_find(tid);
272 }
273#endif
274 if (!timer) {
275 mutex_unlock(®ister_mutex);
276 return -ENODEV;
277 }
278 if (!list_empty(&timer->open_list_head)) {
279 timeri = list_entry(timer->open_list_head.next,
280 struct snd_timer_instance, open_list);
281 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
282 mutex_unlock(®ister_mutex);
283 return -EBUSY;
284 }
285 }
286 timeri = snd_timer_instance_new(owner, timer);
287 if (!timeri) {
288 mutex_unlock(®ister_mutex);
289 return -ENOMEM;
290 }
291 timeri->slave_class = tid->dev_sclass;
292 timeri->slave_id = slave_id;
293 if (list_empty(&timer->open_list_head) && timer->hw.open)
294 timer->hw.open(timer);
295 list_add_tail(&timeri->open_list, &timer->open_list_head);
296 snd_timer_check_master(timeri);
297 mutex_unlock(®ister_mutex);
298 *ti = timeri;
299 return 0;
300}
301
302static int _snd_timer_stop(struct snd_timer_instance *timeri,
303 int keep_flag, int event);
304
305
306
307
308int snd_timer_close(struct snd_timer_instance *timeri)
309{
310 struct snd_timer *timer = NULL;
311 struct snd_timer_instance *slave, *tmp;
312
313 if (snd_BUG_ON(!timeri))
314 return -ENXIO;
315
316
317 snd_timer_stop(timeri);
318
319 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
320
321 spin_lock_irq(&slave_active_lock);
322 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
323 spin_unlock_irq(&slave_active_lock);
324 udelay(10);
325 spin_lock_irq(&slave_active_lock);
326 }
327 spin_unlock_irq(&slave_active_lock);
328 mutex_lock(®ister_mutex);
329 list_del(&timeri->open_list);
330 mutex_unlock(®ister_mutex);
331 } else {
332 timer = timeri->timer;
333 if (snd_BUG_ON(!timer))
334 goto out;
335
336 spin_lock_irq(&timer->lock);
337 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
338 spin_unlock_irq(&timer->lock);
339 udelay(10);
340 spin_lock_irq(&timer->lock);
341 }
342 spin_unlock_irq(&timer->lock);
343 mutex_lock(®ister_mutex);
344 list_del(&timeri->open_list);
345 if (timer && list_empty(&timer->open_list_head) &&
346 timer->hw.close)
347 timer->hw.close(timer);
348
349 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
350 open_list) {
351 spin_lock_irq(&slave_active_lock);
352 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
353 list_move_tail(&slave->open_list, &snd_timer_slave_list);
354 slave->master = NULL;
355 slave->timer = NULL;
356 spin_unlock_irq(&slave_active_lock);
357 }
358 mutex_unlock(®ister_mutex);
359 }
360 out:
361 if (timeri->private_free)
362 timeri->private_free(timeri);
363 kfree(timeri->owner);
364 kfree(timeri);
365 if (timer)
366 module_put(timer->module);
367 return 0;
368}
369
370unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
371{
372 struct snd_timer * timer;
373
374 if (timeri == NULL)
375 return 0;
376 if ((timer = timeri->timer) != NULL) {
377 if (timer->hw.c_resolution)
378 return timer->hw.c_resolution(timer);
379 return timer->hw.resolution;
380 }
381 return 0;
382}
383
384static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
385{
386 struct snd_timer *timer;
387 unsigned long flags;
388 unsigned long resolution = 0;
389 struct snd_timer_instance *ts;
390 struct timespec tstamp;
391
392 if (timer_tstamp_monotonic)
393 ktime_get_ts(&tstamp);
394 else
395 getnstimeofday(&tstamp);
396 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
397 event > SNDRV_TIMER_EVENT_PAUSE))
398 return;
399 if (event == SNDRV_TIMER_EVENT_START ||
400 event == SNDRV_TIMER_EVENT_CONTINUE)
401 resolution = snd_timer_resolution(ti);
402 if (ti->ccallback)
403 ti->ccallback(ti, event, &tstamp, resolution);
404 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
405 return;
406 timer = ti->timer;
407 if (timer == NULL)
408 return;
409 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
410 return;
411 spin_lock_irqsave(&timer->lock, flags);
412 list_for_each_entry(ts, &ti->slave_active_head, active_list)
413 if (ts->ccallback)
414 ts->ccallback(ti, event + 100, &tstamp, resolution);
415 spin_unlock_irqrestore(&timer->lock, flags);
416}
417
418static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
419 unsigned long sticks)
420{
421 list_move_tail(&timeri->active_list, &timer->active_list_head);
422 if (timer->running) {
423 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
424 goto __start_now;
425 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
426 timeri->flags |= SNDRV_TIMER_IFLG_START;
427 return 1;
428 } else {
429 timer->sticks = sticks;
430 timer->hw.start(timer);
431 __start_now:
432 timer->running++;
433 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
434 return 0;
435 }
436}
437
438static int snd_timer_start_slave(struct snd_timer_instance *timeri)
439{
440 unsigned long flags;
441
442 spin_lock_irqsave(&slave_active_lock, flags);
443 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
444 if (timeri->master)
445 list_add_tail(&timeri->active_list,
446 &timeri->master->slave_active_head);
447 spin_unlock_irqrestore(&slave_active_lock, flags);
448 return 1;
449}
450
451
452
453
454int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
455{
456 struct snd_timer *timer;
457 int result = -EINVAL;
458 unsigned long flags;
459
460 if (timeri == NULL || ticks < 1)
461 return -EINVAL;
462 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
463 result = snd_timer_start_slave(timeri);
464 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
465 return result;
466 }
467 timer = timeri->timer;
468 if (timer == NULL)
469 return -EINVAL;
470 spin_lock_irqsave(&timer->lock, flags);
471 timeri->ticks = timeri->cticks = ticks;
472 timeri->pticks = 0;
473 result = snd_timer_start1(timer, timeri, ticks);
474 spin_unlock_irqrestore(&timer->lock, flags);
475 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
476 return result;
477}
478
479static int _snd_timer_stop(struct snd_timer_instance * timeri,
480 int keep_flag, int event)
481{
482 struct snd_timer *timer;
483 unsigned long flags;
484
485 if (snd_BUG_ON(!timeri))
486 return -ENXIO;
487
488 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
489 if (!keep_flag) {
490 spin_lock_irqsave(&slave_active_lock, flags);
491 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
492 spin_unlock_irqrestore(&slave_active_lock, flags);
493 }
494 goto __end;
495 }
496 timer = timeri->timer;
497 if (!timer)
498 return -EINVAL;
499 spin_lock_irqsave(&timer->lock, flags);
500 list_del_init(&timeri->ack_list);
501 list_del_init(&timeri->active_list);
502 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
503 !(--timer->running)) {
504 timer->hw.stop(timer);
505 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
506 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
507 snd_timer_reschedule(timer, 0);
508 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
509 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
510 timer->hw.start(timer);
511 }
512 }
513 }
514 if (!keep_flag)
515 timeri->flags &=
516 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
517 spin_unlock_irqrestore(&timer->lock, flags);
518 __end:
519 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
520 snd_timer_notify1(timeri, event);
521 return 0;
522}
523
524
525
526
527
528
529int snd_timer_stop(struct snd_timer_instance *timeri)
530{
531 struct snd_timer *timer;
532 unsigned long flags;
533 int err;
534
535 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
536 if (err < 0)
537 return err;
538 timer = timeri->timer;
539 if (!timer)
540 return -EINVAL;
541 spin_lock_irqsave(&timer->lock, flags);
542 timeri->cticks = timeri->ticks;
543 timeri->pticks = 0;
544 spin_unlock_irqrestore(&timer->lock, flags);
545 return 0;
546}
547
548
549
550
551int snd_timer_continue(struct snd_timer_instance *timeri)
552{
553 struct snd_timer *timer;
554 int result = -EINVAL;
555 unsigned long flags;
556
557 if (timeri == NULL)
558 return result;
559 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
560 return snd_timer_start_slave(timeri);
561 timer = timeri->timer;
562 if (! timer)
563 return -EINVAL;
564 spin_lock_irqsave(&timer->lock, flags);
565 if (!timeri->cticks)
566 timeri->cticks = 1;
567 timeri->pticks = 0;
568 result = snd_timer_start1(timer, timeri, timer->sticks);
569 spin_unlock_irqrestore(&timer->lock, flags);
570 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
571 return result;
572}
573
574
575
576
577int snd_timer_pause(struct snd_timer_instance * timeri)
578{
579 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
580}
581
582
583
584
585
586
587
588static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
589{
590 struct snd_timer_instance *ti;
591 unsigned long ticks = ~0UL;
592
593 list_for_each_entry(ti, &timer->active_list_head, active_list) {
594 if (ti->flags & SNDRV_TIMER_IFLG_START) {
595 ti->flags &= ~SNDRV_TIMER_IFLG_START;
596 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
597 timer->running++;
598 }
599 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
600 if (ticks > ti->cticks)
601 ticks = ti->cticks;
602 }
603 }
604 if (ticks == ~0UL) {
605 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
606 return;
607 }
608 if (ticks > timer->hw.ticks)
609 ticks = timer->hw.ticks;
610 if (ticks_left != ticks)
611 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
612 timer->sticks = ticks;
613}
614
615
616
617
618
619static void snd_timer_tasklet(unsigned long arg)
620{
621 struct snd_timer *timer = (struct snd_timer *) arg;
622 struct snd_timer_instance *ti;
623 struct list_head *p;
624 unsigned long resolution, ticks;
625 unsigned long flags;
626
627 spin_lock_irqsave(&timer->lock, flags);
628
629 while (!list_empty(&timer->sack_list_head)) {
630 p = timer->sack_list_head.next;
631 ti = list_entry(p, struct snd_timer_instance, ack_list);
632
633
634 list_del_init(p);
635
636 ticks = ti->pticks;
637 ti->pticks = 0;
638 resolution = ti->resolution;
639
640 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
641 spin_unlock(&timer->lock);
642 if (ti->callback)
643 ti->callback(ti, resolution, ticks);
644 spin_lock(&timer->lock);
645 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
646 }
647 spin_unlock_irqrestore(&timer->lock, flags);
648}
649
650
651
652
653
654
655
656void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
657{
658 struct snd_timer_instance *ti, *ts, *tmp;
659 unsigned long resolution, ticks;
660 struct list_head *p, *ack_list_head;
661 unsigned long flags;
662 int use_tasklet = 0;
663
664 if (timer == NULL)
665 return;
666
667 spin_lock_irqsave(&timer->lock, flags);
668
669
670 if (timer->hw.c_resolution)
671 resolution = timer->hw.c_resolution(timer);
672 else
673 resolution = timer->hw.resolution;
674
675
676
677
678
679
680 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
681 active_list) {
682 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
683 continue;
684 ti->pticks += ticks_left;
685 ti->resolution = resolution;
686 if (ti->cticks < ticks_left)
687 ti->cticks = 0;
688 else
689 ti->cticks -= ticks_left;
690 if (ti->cticks)
691 continue;
692 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
693 ti->cticks = ti->ticks;
694 } else {
695 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
696 if (--timer->running)
697 list_del(&ti->active_list);
698 }
699 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
700 (ti->flags & SNDRV_TIMER_IFLG_FAST))
701 ack_list_head = &timer->ack_list_head;
702 else
703 ack_list_head = &timer->sack_list_head;
704 if (list_empty(&ti->ack_list))
705 list_add_tail(&ti->ack_list, ack_list_head);
706 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
707 ts->pticks = ti->pticks;
708 ts->resolution = resolution;
709 if (list_empty(&ts->ack_list))
710 list_add_tail(&ts->ack_list, ack_list_head);
711 }
712 }
713 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
714 snd_timer_reschedule(timer, timer->sticks);
715 if (timer->running) {
716 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
717 timer->hw.stop(timer);
718 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
719 }
720 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
721 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
722
723 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
724 timer->hw.start(timer);
725 }
726 } else {
727 timer->hw.stop(timer);
728 }
729
730
731 while (!list_empty(&timer->ack_list_head)) {
732 p = timer->ack_list_head.next;
733 ti = list_entry(p, struct snd_timer_instance, ack_list);
734
735
736 list_del_init(p);
737
738 ticks = ti->pticks;
739 ti->pticks = 0;
740
741 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
742 spin_unlock(&timer->lock);
743 if (ti->callback)
744 ti->callback(ti, resolution, ticks);
745 spin_lock(&timer->lock);
746 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
747 }
748
749
750 use_tasklet = !list_empty(&timer->sack_list_head);
751 spin_unlock_irqrestore(&timer->lock, flags);
752
753 if (use_tasklet)
754 tasklet_schedule(&timer->task_queue);
755}
756
757
758
759
760
761int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
762 struct snd_timer **rtimer)
763{
764 struct snd_timer *timer;
765 int err;
766 static struct snd_device_ops ops = {
767 .dev_free = snd_timer_dev_free,
768 .dev_register = snd_timer_dev_register,
769 .dev_disconnect = snd_timer_dev_disconnect,
770 };
771
772 if (snd_BUG_ON(!tid))
773 return -EINVAL;
774 if (rtimer)
775 *rtimer = NULL;
776 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
777 if (!timer)
778 return -ENOMEM;
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 pr_warn("ALSA: 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
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
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
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 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1032 timer->private_data = priv;
1033 timer->private_free = snd_timer_free_system;
1034 return snd_timer_global_register(timer);
1035}
1036
1037#ifdef CONFIG_PROC_FS
1038
1039
1040
1041
1042static void snd_timer_proc_read(struct snd_info_entry *entry,
1043 struct snd_info_buffer *buffer)
1044{
1045 struct snd_timer *timer;
1046 struct snd_timer_instance *ti;
1047
1048 mutex_lock(®ister_mutex);
1049 list_for_each_entry(timer, &snd_timer_list, device_list) {
1050 switch (timer->tmr_class) {
1051 case SNDRV_TIMER_CLASS_GLOBAL:
1052 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1053 break;
1054 case SNDRV_TIMER_CLASS_CARD:
1055 snd_iprintf(buffer, "C%i-%i: ",
1056 timer->card->number, timer->tmr_device);
1057 break;
1058 case SNDRV_TIMER_CLASS_PCM:
1059 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1060 timer->tmr_device, timer->tmr_subdevice);
1061 break;
1062 default:
1063 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1064 timer->card ? timer->card->number : -1,
1065 timer->tmr_device, timer->tmr_subdevice);
1066 }
1067 snd_iprintf(buffer, "%s :", timer->name);
1068 if (timer->hw.resolution)
1069 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1070 timer->hw.resolution / 1000,
1071 timer->hw.resolution % 1000,
1072 timer->hw.ticks);
1073 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1074 snd_iprintf(buffer, " SLAVE");
1075 snd_iprintf(buffer, "\n");
1076 list_for_each_entry(ti, &timer->open_list_head, open_list)
1077 snd_iprintf(buffer, " Client %s : %s\n",
1078 ti->owner ? ti->owner : "unknown",
1079 ti->flags & (SNDRV_TIMER_IFLG_START |
1080 SNDRV_TIMER_IFLG_RUNNING)
1081 ? "running" : "stopped");
1082 }
1083 mutex_unlock(®ister_mutex);
1084}
1085
1086static struct snd_info_entry *snd_timer_proc_entry;
1087
1088static void __init snd_timer_proc_init(void)
1089{
1090 struct snd_info_entry *entry;
1091
1092 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1093 if (entry != NULL) {
1094 entry->c.text.read = snd_timer_proc_read;
1095 if (snd_info_register(entry) < 0) {
1096 snd_info_free_entry(entry);
1097 entry = NULL;
1098 }
1099 }
1100 snd_timer_proc_entry = entry;
1101}
1102
1103static void __exit snd_timer_proc_done(void)
1104{
1105 snd_info_free_entry(snd_timer_proc_entry);
1106}
1107#else
1108#define snd_timer_proc_init()
1109#define snd_timer_proc_done()
1110#endif
1111
1112
1113
1114
1115
1116static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1117 unsigned long resolution,
1118 unsigned long ticks)
1119{
1120 struct snd_timer_user *tu = timeri->callback_data;
1121 struct snd_timer_read *r;
1122 int prev;
1123
1124 spin_lock(&tu->qlock);
1125 if (tu->qused > 0) {
1126 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1127 r = &tu->queue[prev];
1128 if (r->resolution == resolution) {
1129 r->ticks += ticks;
1130 goto __wake;
1131 }
1132 }
1133 if (tu->qused >= tu->queue_size) {
1134 tu->overrun++;
1135 } else {
1136 r = &tu->queue[tu->qtail++];
1137 tu->qtail %= tu->queue_size;
1138 r->resolution = resolution;
1139 r->ticks = ticks;
1140 tu->qused++;
1141 }
1142 __wake:
1143 spin_unlock(&tu->qlock);
1144 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1145 wake_up(&tu->qchange_sleep);
1146}
1147
1148static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1149 struct snd_timer_tread *tread)
1150{
1151 if (tu->qused >= tu->queue_size) {
1152 tu->overrun++;
1153 } else {
1154 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1155 tu->qtail %= tu->queue_size;
1156 tu->qused++;
1157 }
1158}
1159
1160static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1161 int event,
1162 struct timespec *tstamp,
1163 unsigned long resolution)
1164{
1165 struct snd_timer_user *tu = timeri->callback_data;
1166 struct snd_timer_tread r1;
1167 unsigned long flags;
1168
1169 if (event >= SNDRV_TIMER_EVENT_START &&
1170 event <= SNDRV_TIMER_EVENT_PAUSE)
1171 tu->tstamp = *tstamp;
1172 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1173 return;
1174 r1.event = event;
1175 r1.tstamp = *tstamp;
1176 r1.val = resolution;
1177 spin_lock_irqsave(&tu->qlock, flags);
1178 snd_timer_user_append_to_tqueue(tu, &r1);
1179 spin_unlock_irqrestore(&tu->qlock, flags);
1180 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1181 wake_up(&tu->qchange_sleep);
1182}
1183
1184static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1185 unsigned long resolution,
1186 unsigned long ticks)
1187{
1188 struct snd_timer_user *tu = timeri->callback_data;
1189 struct snd_timer_tread *r, r1;
1190 struct timespec tstamp;
1191 int prev, append = 0;
1192
1193 memset(&tstamp, 0, sizeof(tstamp));
1194 spin_lock(&tu->qlock);
1195 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1196 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1197 spin_unlock(&tu->qlock);
1198 return;
1199 }
1200 if (tu->last_resolution != resolution || ticks > 0) {
1201 if (timer_tstamp_monotonic)
1202 ktime_get_ts(&tstamp);
1203 else
1204 getnstimeofday(&tstamp);
1205 }
1206 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1207 tu->last_resolution != resolution) {
1208 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1209 r1.tstamp = tstamp;
1210 r1.val = resolution;
1211 snd_timer_user_append_to_tqueue(tu, &r1);
1212 tu->last_resolution = resolution;
1213 append++;
1214 }
1215 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1216 goto __wake;
1217 if (ticks == 0)
1218 goto __wake;
1219 if (tu->qused > 0) {
1220 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1221 r = &tu->tqueue[prev];
1222 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1223 r->tstamp = tstamp;
1224 r->val += ticks;
1225 append++;
1226 goto __wake;
1227 }
1228 }
1229 r1.event = SNDRV_TIMER_EVENT_TICK;
1230 r1.tstamp = tstamp;
1231 r1.val = ticks;
1232 snd_timer_user_append_to_tqueue(tu, &r1);
1233 append++;
1234 __wake:
1235 spin_unlock(&tu->qlock);
1236 if (append == 0)
1237 return;
1238 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1239 wake_up(&tu->qchange_sleep);
1240}
1241
1242static int snd_timer_user_open(struct inode *inode, struct file *file)
1243{
1244 struct snd_timer_user *tu;
1245 int err;
1246
1247 err = nonseekable_open(inode, file);
1248 if (err < 0)
1249 return err;
1250
1251 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1252 if (tu == NULL)
1253 return -ENOMEM;
1254 spin_lock_init(&tu->qlock);
1255 init_waitqueue_head(&tu->qchange_sleep);
1256 mutex_init(&tu->tread_sem);
1257 tu->ticks = 1;
1258 tu->queue_size = 128;
1259 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1260 GFP_KERNEL);
1261 if (tu->queue == NULL) {
1262 kfree(tu);
1263 return -ENOMEM;
1264 }
1265 file->private_data = tu;
1266 return 0;
1267}
1268
1269static int snd_timer_user_release(struct inode *inode, struct file *file)
1270{
1271 struct snd_timer_user *tu;
1272
1273 if (file->private_data) {
1274 tu = file->private_data;
1275 file->private_data = NULL;
1276 if (tu->timeri)
1277 snd_timer_close(tu->timeri);
1278 kfree(tu->queue);
1279 kfree(tu->tqueue);
1280 kfree(tu);
1281 }
1282 return 0;
1283}
1284
1285static void snd_timer_user_zero_id(struct snd_timer_id *id)
1286{
1287 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1288 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1289 id->card = -1;
1290 id->device = -1;
1291 id->subdevice = -1;
1292}
1293
1294static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1295{
1296 id->dev_class = timer->tmr_class;
1297 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1298 id->card = timer->card ? timer->card->number : -1;
1299 id->device = timer->tmr_device;
1300 id->subdevice = timer->tmr_subdevice;
1301}
1302
1303static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1304{
1305 struct snd_timer_id id;
1306 struct snd_timer *timer;
1307 struct list_head *p;
1308
1309 if (copy_from_user(&id, _tid, sizeof(id)))
1310 return -EFAULT;
1311 mutex_lock(®ister_mutex);
1312 if (id.dev_class < 0) {
1313 if (list_empty(&snd_timer_list))
1314 snd_timer_user_zero_id(&id);
1315 else {
1316 timer = list_entry(snd_timer_list.next,
1317 struct snd_timer, device_list);
1318 snd_timer_user_copy_id(&id, timer);
1319 }
1320 } else {
1321 switch (id.dev_class) {
1322 case SNDRV_TIMER_CLASS_GLOBAL:
1323 id.device = id.device < 0 ? 0 : id.device + 1;
1324 list_for_each(p, &snd_timer_list) {
1325 timer = list_entry(p, struct snd_timer, device_list);
1326 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1327 snd_timer_user_copy_id(&id, timer);
1328 break;
1329 }
1330 if (timer->tmr_device >= id.device) {
1331 snd_timer_user_copy_id(&id, timer);
1332 break;
1333 }
1334 }
1335 if (p == &snd_timer_list)
1336 snd_timer_user_zero_id(&id);
1337 break;
1338 case SNDRV_TIMER_CLASS_CARD:
1339 case SNDRV_TIMER_CLASS_PCM:
1340 if (id.card < 0) {
1341 id.card = 0;
1342 } else {
1343 if (id.card < 0) {
1344 id.card = 0;
1345 } else {
1346 if (id.device < 0) {
1347 id.device = 0;
1348 } else {
1349 if (id.subdevice < 0) {
1350 id.subdevice = 0;
1351 } else {
1352 id.subdevice++;
1353 }
1354 }
1355 }
1356 }
1357 list_for_each(p, &snd_timer_list) {
1358 timer = list_entry(p, struct snd_timer, device_list);
1359 if (timer->tmr_class > id.dev_class) {
1360 snd_timer_user_copy_id(&id, timer);
1361 break;
1362 }
1363 if (timer->tmr_class < id.dev_class)
1364 continue;
1365 if (timer->card->number > id.card) {
1366 snd_timer_user_copy_id(&id, timer);
1367 break;
1368 }
1369 if (timer->card->number < id.card)
1370 continue;
1371 if (timer->tmr_device > id.device) {
1372 snd_timer_user_copy_id(&id, timer);
1373 break;
1374 }
1375 if (timer->tmr_device < id.device)
1376 continue;
1377 if (timer->tmr_subdevice > id.subdevice) {
1378 snd_timer_user_copy_id(&id, timer);
1379 break;
1380 }
1381 if (timer->tmr_subdevice < id.subdevice)
1382 continue;
1383 snd_timer_user_copy_id(&id, timer);
1384 break;
1385 }
1386 if (p == &snd_timer_list)
1387 snd_timer_user_zero_id(&id);
1388 break;
1389 default:
1390 snd_timer_user_zero_id(&id);
1391 }
1392 }
1393 mutex_unlock(®ister_mutex);
1394 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1395 return -EFAULT;
1396 return 0;
1397}
1398
1399static int snd_timer_user_ginfo(struct file *file,
1400 struct snd_timer_ginfo __user *_ginfo)
1401{
1402 struct snd_timer_ginfo *ginfo;
1403 struct snd_timer_id tid;
1404 struct snd_timer *t;
1405 struct list_head *p;
1406 int err = 0;
1407
1408 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1409 if (IS_ERR(ginfo))
1410 return PTR_ERR(ginfo);
1411
1412 tid = ginfo->tid;
1413 memset(ginfo, 0, sizeof(*ginfo));
1414 ginfo->tid = tid;
1415 mutex_lock(®ister_mutex);
1416 t = snd_timer_find(&tid);
1417 if (t != NULL) {
1418 ginfo->card = t->card ? t->card->number : -1;
1419 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1420 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1421 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1422 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1423 ginfo->resolution = t->hw.resolution;
1424 if (t->hw.resolution_min > 0) {
1425 ginfo->resolution_min = t->hw.resolution_min;
1426 ginfo->resolution_max = t->hw.resolution_max;
1427 }
1428 list_for_each(p, &t->open_list_head) {
1429 ginfo->clients++;
1430 }
1431 } else {
1432 err = -ENODEV;
1433 }
1434 mutex_unlock(®ister_mutex);
1435 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1436 err = -EFAULT;
1437 kfree(ginfo);
1438 return err;
1439}
1440
1441static int snd_timer_user_gparams(struct file *file,
1442 struct snd_timer_gparams __user *_gparams)
1443{
1444 struct snd_timer_gparams gparams;
1445 struct snd_timer *t;
1446 int err;
1447
1448 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1449 return -EFAULT;
1450 mutex_lock(®ister_mutex);
1451 t = snd_timer_find(&gparams.tid);
1452 if (!t) {
1453 err = -ENODEV;
1454 goto _error;
1455 }
1456 if (!list_empty(&t->open_list_head)) {
1457 err = -EBUSY;
1458 goto _error;
1459 }
1460 if (!t->hw.set_period) {
1461 err = -ENOSYS;
1462 goto _error;
1463 }
1464 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1465_error:
1466 mutex_unlock(®ister_mutex);
1467 return err;
1468}
1469
1470static int snd_timer_user_gstatus(struct file *file,
1471 struct snd_timer_gstatus __user *_gstatus)
1472{
1473 struct snd_timer_gstatus gstatus;
1474 struct snd_timer_id tid;
1475 struct snd_timer *t;
1476 int err = 0;
1477
1478 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1479 return -EFAULT;
1480 tid = gstatus.tid;
1481 memset(&gstatus, 0, sizeof(gstatus));
1482 gstatus.tid = tid;
1483 mutex_lock(®ister_mutex);
1484 t = snd_timer_find(&tid);
1485 if (t != NULL) {
1486 if (t->hw.c_resolution)
1487 gstatus.resolution = t->hw.c_resolution(t);
1488 else
1489 gstatus.resolution = t->hw.resolution;
1490 if (t->hw.precise_resolution) {
1491 t->hw.precise_resolution(t, &gstatus.resolution_num,
1492 &gstatus.resolution_den);
1493 } else {
1494 gstatus.resolution_num = gstatus.resolution;
1495 gstatus.resolution_den = 1000000000uL;
1496 }
1497 } else {
1498 err = -ENODEV;
1499 }
1500 mutex_unlock(®ister_mutex);
1501 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1502 err = -EFAULT;
1503 return err;
1504}
1505
1506static int snd_timer_user_tselect(struct file *file,
1507 struct snd_timer_select __user *_tselect)
1508{
1509 struct snd_timer_user *tu;
1510 struct snd_timer_select tselect;
1511 char str[32];
1512 int err = 0;
1513
1514 tu = file->private_data;
1515 mutex_lock(&tu->tread_sem);
1516 if (tu->timeri) {
1517 snd_timer_close(tu->timeri);
1518 tu->timeri = NULL;
1519 }
1520 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1521 err = -EFAULT;
1522 goto __err;
1523 }
1524 sprintf(str, "application %i", current->pid);
1525 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1526 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1527 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1528 if (err < 0)
1529 goto __err;
1530
1531 kfree(tu->queue);
1532 tu->queue = NULL;
1533 kfree(tu->tqueue);
1534 tu->tqueue = NULL;
1535 if (tu->tread) {
1536 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1537 GFP_KERNEL);
1538 if (tu->tqueue == NULL)
1539 err = -ENOMEM;
1540 } else {
1541 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1542 GFP_KERNEL);
1543 if (tu->queue == NULL)
1544 err = -ENOMEM;
1545 }
1546
1547 if (err < 0) {
1548 snd_timer_close(tu->timeri);
1549 tu->timeri = NULL;
1550 } else {
1551 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1552 tu->timeri->callback = tu->tread
1553 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1554 tu->timeri->ccallback = snd_timer_user_ccallback;
1555 tu->timeri->callback_data = (void *)tu;
1556 }
1557
1558 __err:
1559 mutex_unlock(&tu->tread_sem);
1560 return err;
1561}
1562
1563static int snd_timer_user_info(struct file *file,
1564 struct snd_timer_info __user *_info)
1565{
1566 struct snd_timer_user *tu;
1567 struct snd_timer_info *info;
1568 struct snd_timer *t;
1569 int err = 0;
1570
1571 tu = file->private_data;
1572 if (!tu->timeri)
1573 return -EBADFD;
1574 t = tu->timeri->timer;
1575 if (!t)
1576 return -EBADFD;
1577
1578 info = kzalloc(sizeof(*info), GFP_KERNEL);
1579 if (! info)
1580 return -ENOMEM;
1581 info->card = t->card ? t->card->number : -1;
1582 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1583 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1584 strlcpy(info->id, t->id, sizeof(info->id));
1585 strlcpy(info->name, t->name, sizeof(info->name));
1586 info->resolution = t->hw.resolution;
1587 if (copy_to_user(_info, info, sizeof(*_info)))
1588 err = -EFAULT;
1589 kfree(info);
1590 return err;
1591}
1592
1593static int snd_timer_user_params(struct file *file,
1594 struct snd_timer_params __user *_params)
1595{
1596 struct snd_timer_user *tu;
1597 struct snd_timer_params params;
1598 struct snd_timer *t;
1599 struct snd_timer_read *tr;
1600 struct snd_timer_tread *ttr;
1601 int err;
1602
1603 tu = file->private_data;
1604 if (!tu->timeri)
1605 return -EBADFD;
1606 t = tu->timeri->timer;
1607 if (!t)
1608 return -EBADFD;
1609 if (copy_from_user(¶ms, _params, sizeof(params)))
1610 return -EFAULT;
1611 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1612 err = -EINVAL;
1613 goto _end;
1614 }
1615 if (params.queue_size > 0 &&
1616 (params.queue_size < 32 || params.queue_size > 1024)) {
1617 err = -EINVAL;
1618 goto _end;
1619 }
1620 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1621 (1<<SNDRV_TIMER_EVENT_TICK)|
1622 (1<<SNDRV_TIMER_EVENT_START)|
1623 (1<<SNDRV_TIMER_EVENT_STOP)|
1624 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1625 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1626 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1627 (1<<SNDRV_TIMER_EVENT_RESUME)|
1628 (1<<SNDRV_TIMER_EVENT_MSTART)|
1629 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1630 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1631 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1632 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1633 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1634 err = -EINVAL;
1635 goto _end;
1636 }
1637 snd_timer_stop(tu->timeri);
1638 spin_lock_irq(&t->lock);
1639 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1640 SNDRV_TIMER_IFLG_EXCLUSIVE|
1641 SNDRV_TIMER_IFLG_EARLY_EVENT);
1642 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1643 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1644 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1645 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1646 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1647 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1648 spin_unlock_irq(&t->lock);
1649 if (params.queue_size > 0 &&
1650 (unsigned int)tu->queue_size != params.queue_size) {
1651 if (tu->tread) {
1652 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1653 GFP_KERNEL);
1654 if (ttr) {
1655 kfree(tu->tqueue);
1656 tu->queue_size = params.queue_size;
1657 tu->tqueue = ttr;
1658 }
1659 } else {
1660 tr = kmalloc(params.queue_size * sizeof(*tr),
1661 GFP_KERNEL);
1662 if (tr) {
1663 kfree(tu->queue);
1664 tu->queue_size = params.queue_size;
1665 tu->queue = tr;
1666 }
1667 }
1668 }
1669 tu->qhead = tu->qtail = tu->qused = 0;
1670 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1671 if (tu->tread) {
1672 struct snd_timer_tread tread;
1673 tread.event = SNDRV_TIMER_EVENT_EARLY;
1674 tread.tstamp.tv_sec = 0;
1675 tread.tstamp.tv_nsec = 0;
1676 tread.val = 0;
1677 snd_timer_user_append_to_tqueue(tu, &tread);
1678 } else {
1679 struct snd_timer_read *r = &tu->queue[0];
1680 r->resolution = 0;
1681 r->ticks = 0;
1682 tu->qused++;
1683 tu->qtail++;
1684 }
1685 }
1686 tu->filter = params.filter;
1687 tu->ticks = params.ticks;
1688 err = 0;
1689 _end:
1690 if (copy_to_user(_params, ¶ms, sizeof(params)))
1691 return -EFAULT;
1692 return err;
1693}
1694
1695static int snd_timer_user_status(struct file *file,
1696 struct snd_timer_status __user *_status)
1697{
1698 struct snd_timer_user *tu;
1699 struct snd_timer_status status;
1700
1701 tu = file->private_data;
1702 if (!tu->timeri)
1703 return -EBADFD;
1704 memset(&status, 0, sizeof(status));
1705 status.tstamp = tu->tstamp;
1706 status.resolution = snd_timer_resolution(tu->timeri);
1707 status.lost = tu->timeri->lost;
1708 status.overrun = tu->overrun;
1709 spin_lock_irq(&tu->qlock);
1710 status.queue = tu->qused;
1711 spin_unlock_irq(&tu->qlock);
1712 if (copy_to_user(_status, &status, sizeof(status)))
1713 return -EFAULT;
1714 return 0;
1715}
1716
1717static int snd_timer_user_start(struct file *file)
1718{
1719 int err;
1720 struct snd_timer_user *tu;
1721
1722 tu = file->private_data;
1723 if (!tu->timeri)
1724 return -EBADFD;
1725 snd_timer_stop(tu->timeri);
1726 tu->timeri->lost = 0;
1727 tu->last_resolution = 0;
1728 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1729}
1730
1731static int snd_timer_user_stop(struct file *file)
1732{
1733 int err;
1734 struct snd_timer_user *tu;
1735
1736 tu = file->private_data;
1737 if (!tu->timeri)
1738 return -EBADFD;
1739 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1740}
1741
1742static int snd_timer_user_continue(struct file *file)
1743{
1744 int err;
1745 struct snd_timer_user *tu;
1746
1747 tu = file->private_data;
1748 if (!tu->timeri)
1749 return -EBADFD;
1750 tu->timeri->lost = 0;
1751 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1752}
1753
1754static int snd_timer_user_pause(struct file *file)
1755{
1756 int err;
1757 struct snd_timer_user *tu;
1758
1759 tu = file->private_data;
1760 if (!tu->timeri)
1761 return -EBADFD;
1762 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1763}
1764
1765enum {
1766 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1767 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1768 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1769 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1770};
1771
1772static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1773 unsigned long arg)
1774{
1775 struct snd_timer_user *tu;
1776 void __user *argp = (void __user *)arg;
1777 int __user *p = argp;
1778
1779 tu = file->private_data;
1780 switch (cmd) {
1781 case SNDRV_TIMER_IOCTL_PVERSION:
1782 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1783 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1784 return snd_timer_user_next_device(argp);
1785 case SNDRV_TIMER_IOCTL_TREAD:
1786 {
1787 int xarg;
1788
1789 mutex_lock(&tu->tread_sem);
1790 if (tu->timeri) {
1791 mutex_unlock(&tu->tread_sem);
1792 return -EBUSY;
1793 }
1794 if (get_user(xarg, p)) {
1795 mutex_unlock(&tu->tread_sem);
1796 return -EFAULT;
1797 }
1798 tu->tread = xarg ? 1 : 0;
1799 mutex_unlock(&tu->tread_sem);
1800 return 0;
1801 }
1802 case SNDRV_TIMER_IOCTL_GINFO:
1803 return snd_timer_user_ginfo(file, argp);
1804 case SNDRV_TIMER_IOCTL_GPARAMS:
1805 return snd_timer_user_gparams(file, argp);
1806 case SNDRV_TIMER_IOCTL_GSTATUS:
1807 return snd_timer_user_gstatus(file, argp);
1808 case SNDRV_TIMER_IOCTL_SELECT:
1809 return snd_timer_user_tselect(file, argp);
1810 case SNDRV_TIMER_IOCTL_INFO:
1811 return snd_timer_user_info(file, argp);
1812 case SNDRV_TIMER_IOCTL_PARAMS:
1813 return snd_timer_user_params(file, argp);
1814 case SNDRV_TIMER_IOCTL_STATUS:
1815 return snd_timer_user_status(file, argp);
1816 case SNDRV_TIMER_IOCTL_START:
1817 case SNDRV_TIMER_IOCTL_START_OLD:
1818 return snd_timer_user_start(file);
1819 case SNDRV_TIMER_IOCTL_STOP:
1820 case SNDRV_TIMER_IOCTL_STOP_OLD:
1821 return snd_timer_user_stop(file);
1822 case SNDRV_TIMER_IOCTL_CONTINUE:
1823 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1824 return snd_timer_user_continue(file);
1825 case SNDRV_TIMER_IOCTL_PAUSE:
1826 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1827 return snd_timer_user_pause(file);
1828 }
1829 return -ENOTTY;
1830}
1831
1832static int snd_timer_user_fasync(int fd, struct file * file, int on)
1833{
1834 struct snd_timer_user *tu;
1835
1836 tu = file->private_data;
1837 return fasync_helper(fd, file, on, &tu->fasync);
1838}
1839
1840static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1841 size_t count, loff_t *offset)
1842{
1843 struct snd_timer_user *tu;
1844 long result = 0, unit;
1845 int err = 0;
1846
1847 tu = file->private_data;
1848 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1849 spin_lock_irq(&tu->qlock);
1850 while ((long)count - result >= unit) {
1851 while (!tu->qused) {
1852 wait_queue_t wait;
1853
1854 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1855 err = -EAGAIN;
1856 break;
1857 }
1858
1859 set_current_state(TASK_INTERRUPTIBLE);
1860 init_waitqueue_entry(&wait, current);
1861 add_wait_queue(&tu->qchange_sleep, &wait);
1862
1863 spin_unlock_irq(&tu->qlock);
1864 schedule();
1865 spin_lock_irq(&tu->qlock);
1866
1867 remove_wait_queue(&tu->qchange_sleep, &wait);
1868
1869 if (signal_pending(current)) {
1870 err = -ERESTARTSYS;
1871 break;
1872 }
1873 }
1874
1875 spin_unlock_irq(&tu->qlock);
1876 if (err < 0)
1877 goto _error;
1878
1879 if (tu->tread) {
1880 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1881 sizeof(struct snd_timer_tread))) {
1882 err = -EFAULT;
1883 goto _error;
1884 }
1885 } else {
1886 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1887 sizeof(struct snd_timer_read))) {
1888 err = -EFAULT;
1889 goto _error;
1890 }
1891 }
1892
1893 tu->qhead %= tu->queue_size;
1894
1895 result += unit;
1896 buffer += unit;
1897
1898 spin_lock_irq(&tu->qlock);
1899 tu->qused--;
1900 }
1901 spin_unlock_irq(&tu->qlock);
1902 _error:
1903 return result > 0 ? result : err;
1904}
1905
1906static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1907{
1908 unsigned int mask;
1909 struct snd_timer_user *tu;
1910
1911 tu = file->private_data;
1912
1913 poll_wait(file, &tu->qchange_sleep, wait);
1914
1915 mask = 0;
1916 if (tu->qused)
1917 mask |= POLLIN | POLLRDNORM;
1918
1919 return mask;
1920}
1921
1922#ifdef CONFIG_COMPAT
1923#include "timer_compat.c"
1924#else
1925#define snd_timer_user_ioctl_compat NULL
1926#endif
1927
1928static const struct file_operations snd_timer_f_ops =
1929{
1930 .owner = THIS_MODULE,
1931 .read = snd_timer_user_read,
1932 .open = snd_timer_user_open,
1933 .release = snd_timer_user_release,
1934 .llseek = no_llseek,
1935 .poll = snd_timer_user_poll,
1936 .unlocked_ioctl = snd_timer_user_ioctl,
1937 .compat_ioctl = snd_timer_user_ioctl_compat,
1938 .fasync = snd_timer_user_fasync,
1939};
1940
1941
1942static void snd_timer_free_all(void)
1943{
1944 struct snd_timer *timer, *n;
1945
1946 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
1947 snd_timer_free(timer);
1948}
1949
1950static struct device timer_dev;
1951
1952
1953
1954
1955
1956static int __init alsa_timer_init(void)
1957{
1958 int err;
1959
1960 snd_device_initialize(&timer_dev, NULL);
1961 dev_set_name(&timer_dev, "timer");
1962
1963#ifdef SNDRV_OSS_INFO_DEV_TIMERS
1964 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1965 "system timer");
1966#endif
1967
1968 err = snd_timer_register_system();
1969 if (err < 0) {
1970 pr_err("ALSA: unable to register system timer (%i)\n", err);
1971 put_device(&timer_dev);
1972 return err;
1973 }
1974
1975 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1976 &snd_timer_f_ops, NULL, &timer_dev);
1977 if (err < 0) {
1978 pr_err("ALSA: unable to register timer device (%i)\n", err);
1979 snd_timer_free_all();
1980 put_device(&timer_dev);
1981 return err;
1982 }
1983
1984 snd_timer_proc_init();
1985 return 0;
1986}
1987
1988static void __exit alsa_timer_exit(void)
1989{
1990 snd_unregister_device(&timer_dev);
1991 snd_timer_free_all();
1992 put_device(&timer_dev);
1993 snd_timer_proc_done();
1994#ifdef SNDRV_OSS_INFO_DEV_TIMERS
1995 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1996#endif
1997}
1998
1999module_init(alsa_timer_init)
2000module_exit(alsa_timer_exit)
2001
2002EXPORT_SYMBOL(snd_timer_open);
2003EXPORT_SYMBOL(snd_timer_close);
2004EXPORT_SYMBOL(snd_timer_resolution);
2005EXPORT_SYMBOL(snd_timer_start);
2006EXPORT_SYMBOL(snd_timer_stop);
2007EXPORT_SYMBOL(snd_timer_continue);
2008EXPORT_SYMBOL(snd_timer_pause);
2009EXPORT_SYMBOL(snd_timer_new);
2010EXPORT_SYMBOL(snd_timer_notify);
2011EXPORT_SYMBOL(snd_timer_global_new);
2012EXPORT_SYMBOL(snd_timer_global_free);
2013EXPORT_SYMBOL(snd_timer_global_register);
2014EXPORT_SYMBOL(snd_timer_interrupt);
2015
