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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
39#define SNDRV_TIMER_IFLG_PAUSED 0x00010000
40#define SNDRV_TIMER_IFLG_DEAD 0x00020000
41
42#if IS_ENABLED(CONFIG_SND_HRTIMER)
43#define DEFAULT_TIMER_LIMIT 4
44#else
45#define DEFAULT_TIMER_LIMIT 1
46#endif
47
48static int timer_limit = DEFAULT_TIMER_LIMIT;
49static int timer_tstamp_monotonic = 1;
50MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
51MODULE_DESCRIPTION("ALSA timer interface");
52MODULE_LICENSE("GPL");
53module_param(timer_limit, int, 0444);
54MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
55module_param(timer_tstamp_monotonic, int, 0444);
56MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
57
58MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
59MODULE_ALIAS("devname:snd/timer");
60
61struct snd_timer_user {
62 struct snd_timer_instance *timeri;
63 int tread;
64 unsigned long ticks;
65 unsigned long overrun;
66 int qhead;
67 int qtail;
68 int qused;
69 int queue_size;
70 bool disconnected;
71 struct snd_timer_read *queue;
72 struct snd_timer_tread *tqueue;
73 spinlock_t qlock;
74 unsigned long last_resolution;
75 unsigned int filter;
76 struct timespec tstamp;
77 wait_queue_head_t qchange_sleep;
78 struct fasync_struct *fasync;
79 struct mutex ioctl_lock;
80};
81
82
83static LIST_HEAD(snd_timer_list);
84
85
86static LIST_HEAD(snd_timer_slave_list);
87
88
89static DEFINE_SPINLOCK(slave_active_lock);
90
91static DEFINE_MUTEX(register_mutex);
92
93static int snd_timer_free(struct snd_timer *timer);
94static int snd_timer_dev_free(struct snd_device *device);
95static int snd_timer_dev_register(struct snd_device *device);
96static int snd_timer_dev_disconnect(struct snd_device *device);
97
98static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
99
100
101
102
103
104static struct snd_timer_instance *snd_timer_instance_new(char *owner,
105 struct snd_timer *timer)
106{
107 struct snd_timer_instance *timeri;
108 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
109 if (timeri == NULL)
110 return NULL;
111 timeri->owner = kstrdup(owner, GFP_KERNEL);
112 if (! timeri->owner) {
113 kfree(timeri);
114 return NULL;
115 }
116 INIT_LIST_HEAD(&timeri->open_list);
117 INIT_LIST_HEAD(&timeri->active_list);
118 INIT_LIST_HEAD(&timeri->ack_list);
119 INIT_LIST_HEAD(&timeri->slave_list_head);
120 INIT_LIST_HEAD(&timeri->slave_active_head);
121
122 timeri->timer = timer;
123 if (timer && !try_module_get(timer->module)) {
124 kfree(timeri->owner);
125 kfree(timeri);
126 return NULL;
127 }
128
129 return timeri;
130}
131
132
133
134
135static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
136{
137 struct snd_timer *timer = NULL;
138
139 list_for_each_entry(timer, &snd_timer_list, device_list) {
140 if (timer->tmr_class != tid->dev_class)
141 continue;
142 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
143 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
144 (timer->card == NULL ||
145 timer->card->number != tid->card))
146 continue;
147 if (timer->tmr_device != tid->device)
148 continue;
149 if (timer->tmr_subdevice != tid->subdevice)
150 continue;
151 return timer;
152 }
153 return NULL;
154}
155
156#ifdef CONFIG_MODULES
157
158static void snd_timer_request(struct snd_timer_id *tid)
159{
160 switch (tid->dev_class) {
161 case SNDRV_TIMER_CLASS_GLOBAL:
162 if (tid->device < timer_limit)
163 request_module("snd-timer-%i", tid->device);
164 break;
165 case SNDRV_TIMER_CLASS_CARD:
166 case SNDRV_TIMER_CLASS_PCM:
167 if (tid->card < snd_ecards_limit)
168 request_module("snd-card-%i", tid->card);
169 break;
170 default:
171 break;
172 }
173}
174
175#endif
176
177
178
179
180
181
182
183static int snd_timer_check_slave(struct snd_timer_instance *slave)
184{
185 struct snd_timer *timer;
186 struct snd_timer_instance *master;
187
188
189 list_for_each_entry(timer, &snd_timer_list, device_list) {
190 list_for_each_entry(master, &timer->open_list_head, open_list) {
191 if (slave->slave_class == master->slave_class &&
192 slave->slave_id == master->slave_id) {
193 if (master->timer->num_instances >=
194 master->timer->max_instances)
195 return -EBUSY;
196 list_move_tail(&slave->open_list,
197 &master->slave_list_head);
198 master->timer->num_instances++;
199 spin_lock_irq(&slave_active_lock);
200 slave->master = master;
201 slave->timer = master->timer;
202 spin_unlock_irq(&slave_active_lock);
203 return 0;
204 }
205 }
206 }
207 return 0;
208}
209
210
211
212
213
214
215
216static int snd_timer_check_master(struct snd_timer_instance *master)
217{
218 struct snd_timer_instance *slave, *tmp;
219
220
221 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
222 if (slave->slave_class == master->slave_class &&
223 slave->slave_id == master->slave_id) {
224 if (master->timer->num_instances >=
225 master->timer->max_instances)
226 return -EBUSY;
227 list_move_tail(&slave->open_list, &master->slave_list_head);
228 master->timer->num_instances++;
229 spin_lock_irq(&slave_active_lock);
230 spin_lock(&master->timer->lock);
231 slave->master = master;
232 slave->timer = master->timer;
233 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
234 list_add_tail(&slave->active_list,
235 &master->slave_active_head);
236 spin_unlock(&master->timer->lock);
237 spin_unlock_irq(&slave_active_lock);
238 }
239 }
240 return 0;
241}
242
243static int snd_timer_close_locked(struct snd_timer_instance *timeri);
244
245
246
247
248
249int snd_timer_open(struct snd_timer_instance **ti,
250 char *owner, struct snd_timer_id *tid,
251 unsigned int slave_id)
252{
253 struct snd_timer *timer;
254 struct snd_timer_instance *timeri = NULL;
255 int err;
256
257 mutex_lock(®ister_mutex);
258 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
259
260 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
261 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
262 pr_debug("ALSA: timer: invalid slave class %i\n",
263 tid->dev_sclass);
264 err = -EINVAL;
265 goto unlock;
266 }
267 timeri = snd_timer_instance_new(owner, NULL);
268 if (!timeri) {
269 err = -ENOMEM;
270 goto unlock;
271 }
272 timeri->slave_class = tid->dev_sclass;
273 timeri->slave_id = tid->device;
274 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
275 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
276 err = snd_timer_check_slave(timeri);
277 if (err < 0) {
278 snd_timer_close_locked(timeri);
279 timeri = NULL;
280 }
281 goto unlock;
282 }
283
284
285 timer = snd_timer_find(tid);
286#ifdef CONFIG_MODULES
287 if (!timer) {
288 mutex_unlock(®ister_mutex);
289 snd_timer_request(tid);
290 mutex_lock(®ister_mutex);
291 timer = snd_timer_find(tid);
292 }
293#endif
294 if (!timer) {
295 err = -ENODEV;
296 goto unlock;
297 }
298 if (!list_empty(&timer->open_list_head)) {
299 timeri = list_entry(timer->open_list_head.next,
300 struct snd_timer_instance, open_list);
301 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
302 err = -EBUSY;
303 timeri = NULL;
304 goto unlock;
305 }
306 }
307 if (timer->num_instances >= timer->max_instances) {
308 err = -EBUSY;
309 goto unlock;
310 }
311 timeri = snd_timer_instance_new(owner, timer);
312 if (!timeri) {
313 err = -ENOMEM;
314 goto unlock;
315 }
316
317 if (timer->card)
318 get_device(&timer->card->card_dev);
319 timeri->slave_class = tid->dev_sclass;
320 timeri->slave_id = slave_id;
321
322 if (list_empty(&timer->open_list_head) && timer->hw.open) {
323 err = timer->hw.open(timer);
324 if (err) {
325 kfree(timeri->owner);
326 kfree(timeri);
327 timeri = NULL;
328
329 if (timer->card)
330 put_device(&timer->card->card_dev);
331 module_put(timer->module);
332 goto unlock;
333 }
334 }
335
336 list_add_tail(&timeri->open_list, &timer->open_list_head);
337 timer->num_instances++;
338 err = snd_timer_check_master(timeri);
339 if (err < 0) {
340 snd_timer_close_locked(timeri);
341 timeri = NULL;
342 }
343
344 unlock:
345 mutex_unlock(®ister_mutex);
346 *ti = timeri;
347 return err;
348}
349EXPORT_SYMBOL(snd_timer_open);
350
351
352
353
354
355static int snd_timer_close_locked(struct snd_timer_instance *timeri)
356{
357 struct snd_timer *timer = timeri->timer;
358 struct snd_timer_instance *slave, *tmp;
359
360 if (timer) {
361 spin_lock_irq(&timer->lock);
362 timeri->flags |= SNDRV_TIMER_IFLG_DEAD;
363 spin_unlock_irq(&timer->lock);
364 }
365
366 list_del(&timeri->open_list);
367
368
369 snd_timer_stop(timeri);
370
371 if (timer) {
372 timer->num_instances--;
373
374 spin_lock_irq(&timer->lock);
375 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
376 spin_unlock_irq(&timer->lock);
377 udelay(10);
378 spin_lock_irq(&timer->lock);
379 }
380 spin_unlock_irq(&timer->lock);
381
382
383 spin_lock_irq(&slave_active_lock);
384 spin_lock(&timer->lock);
385 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
386 open_list) {
387 list_move_tail(&slave->open_list, &snd_timer_slave_list);
388 timer->num_instances--;
389 slave->master = NULL;
390 slave->timer = NULL;
391 list_del_init(&slave->ack_list);
392 list_del_init(&slave->active_list);
393 }
394 spin_unlock(&timer->lock);
395 spin_unlock_irq(&slave_active_lock);
396
397
398 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
399 timer = NULL;
400 }
401
402 if (timeri->private_free)
403 timeri->private_free(timeri);
404 kfree(timeri->owner);
405 kfree(timeri);
406
407 if (timer) {
408 if (list_empty(&timer->open_list_head) && timer->hw.close)
409 timer->hw.close(timer);
410
411 if (timer->card)
412 put_device(&timer->card->card_dev);
413 module_put(timer->module);
414 }
415
416 return 0;
417}
418
419
420
421
422int snd_timer_close(struct snd_timer_instance *timeri)
423{
424 int err;
425
426 if (snd_BUG_ON(!timeri))
427 return -ENXIO;
428
429 mutex_lock(®ister_mutex);
430 err = snd_timer_close_locked(timeri);
431 mutex_unlock(®ister_mutex);
432 return err;
433}
434EXPORT_SYMBOL(snd_timer_close);
435
436static unsigned long snd_timer_hw_resolution(struct snd_timer *timer)
437{
438 if (timer->hw.c_resolution)
439 return timer->hw.c_resolution(timer);
440 else
441 return timer->hw.resolution;
442}
443
444unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
445{
446 struct snd_timer * timer;
447 unsigned long ret = 0;
448 unsigned long flags;
449
450 if (timeri == NULL)
451 return 0;
452 timer = timeri->timer;
453 if (timer) {
454 spin_lock_irqsave(&timer->lock, flags);
455 ret = snd_timer_hw_resolution(timer);
456 spin_unlock_irqrestore(&timer->lock, flags);
457 }
458 return ret;
459}
460EXPORT_SYMBOL(snd_timer_resolution);
461
462static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
463{
464 struct snd_timer *timer = ti->timer;
465 unsigned long resolution = 0;
466 struct snd_timer_instance *ts;
467 struct timespec tstamp;
468
469 if (timer_tstamp_monotonic)
470 ktime_get_ts(&tstamp);
471 else
472 getnstimeofday(&tstamp);
473 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
474 event > SNDRV_TIMER_EVENT_PAUSE))
475 return;
476 if (timer &&
477 (event == SNDRV_TIMER_EVENT_START ||
478 event == SNDRV_TIMER_EVENT_CONTINUE))
479 resolution = snd_timer_hw_resolution(timer);
480 if (ti->ccallback)
481 ti->ccallback(ti, event, &tstamp, resolution);
482 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
483 return;
484 if (timer == NULL)
485 return;
486 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
487 return;
488 list_for_each_entry(ts, &ti->slave_active_head, active_list)
489 if (ts->ccallback)
490 ts->ccallback(ts, event + 100, &tstamp, resolution);
491}
492
493
494static int snd_timer_start1(struct snd_timer_instance *timeri,
495 bool start, unsigned long ticks)
496{
497 struct snd_timer *timer;
498 int result;
499 unsigned long flags;
500
501 timer = timeri->timer;
502 if (!timer)
503 return -EINVAL;
504
505 spin_lock_irqsave(&timer->lock, flags);
506 if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
507 result = -EINVAL;
508 goto unlock;
509 }
510 if (timer->card && timer->card->shutdown) {
511 result = -ENODEV;
512 goto unlock;
513 }
514 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
515 SNDRV_TIMER_IFLG_START)) {
516 result = -EBUSY;
517 goto unlock;
518 }
519
520 if (start)
521 timeri->ticks = timeri->cticks = ticks;
522 else if (!timeri->cticks)
523 timeri->cticks = 1;
524 timeri->pticks = 0;
525
526 list_move_tail(&timeri->active_list, &timer->active_list_head);
527 if (timer->running) {
528 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
529 goto __start_now;
530 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
531 timeri->flags |= SNDRV_TIMER_IFLG_START;
532 result = 1;
533 } else {
534 if (start)
535 timer->sticks = ticks;
536 timer->hw.start(timer);
537 __start_now:
538 timer->running++;
539 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
540 result = 0;
541 }
542 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
543 SNDRV_TIMER_EVENT_CONTINUE);
544 unlock:
545 spin_unlock_irqrestore(&timer->lock, flags);
546 return result;
547}
548
549
550static int snd_timer_start_slave(struct snd_timer_instance *timeri,
551 bool start)
552{
553 unsigned long flags;
554 int err;
555
556 spin_lock_irqsave(&slave_active_lock, flags);
557 if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
558 err = -EINVAL;
559 goto unlock;
560 }
561 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
562 err = -EBUSY;
563 goto unlock;
564 }
565 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
566 if (timeri->master && timeri->timer) {
567 spin_lock(&timeri->timer->lock);
568 list_add_tail(&timeri->active_list,
569 &timeri->master->slave_active_head);
570 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
571 SNDRV_TIMER_EVENT_CONTINUE);
572 spin_unlock(&timeri->timer->lock);
573 }
574 err = 1;
575 unlock:
576 spin_unlock_irqrestore(&slave_active_lock, flags);
577 return err;
578}
579
580
581static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
582{
583 struct snd_timer *timer;
584 int result = 0;
585 unsigned long flags;
586
587 timer = timeri->timer;
588 if (!timer)
589 return -EINVAL;
590 spin_lock_irqsave(&timer->lock, flags);
591 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
592 SNDRV_TIMER_IFLG_START))) {
593 result = -EBUSY;
594 goto unlock;
595 }
596 list_del_init(&timeri->ack_list);
597 list_del_init(&timeri->active_list);
598 if (timer->card && timer->card->shutdown)
599 goto unlock;
600 if (stop) {
601 timeri->cticks = timeri->ticks;
602 timeri->pticks = 0;
603 }
604 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
605 !(--timer->running)) {
606 timer->hw.stop(timer);
607 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
608 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
609 snd_timer_reschedule(timer, 0);
610 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
611 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
612 timer->hw.start(timer);
613 }
614 }
615 }
616 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
617 if (stop)
618 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
619 else
620 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
621 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
622 SNDRV_TIMER_EVENT_PAUSE);
623 unlock:
624 spin_unlock_irqrestore(&timer->lock, flags);
625 return result;
626}
627
628
629static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
630{
631 unsigned long flags;
632
633 spin_lock_irqsave(&slave_active_lock, flags);
634 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
635 spin_unlock_irqrestore(&slave_active_lock, flags);
636 return -EBUSY;
637 }
638 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
639 if (timeri->timer) {
640 spin_lock(&timeri->timer->lock);
641 list_del_init(&timeri->ack_list);
642 list_del_init(&timeri->active_list);
643 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
644 SNDRV_TIMER_EVENT_PAUSE);
645 spin_unlock(&timeri->timer->lock);
646 }
647 spin_unlock_irqrestore(&slave_active_lock, flags);
648 return 0;
649}
650
651
652
653
654int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
655{
656 if (timeri == NULL || ticks < 1)
657 return -EINVAL;
658 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
659 return snd_timer_start_slave(timeri, true);
660 else
661 return snd_timer_start1(timeri, true, ticks);
662}
663EXPORT_SYMBOL(snd_timer_start);
664
665
666
667
668
669
670int snd_timer_stop(struct snd_timer_instance *timeri)
671{
672 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
673 return snd_timer_stop_slave(timeri, true);
674 else
675 return snd_timer_stop1(timeri, true);
676}
677EXPORT_SYMBOL(snd_timer_stop);
678
679
680
681
682int snd_timer_continue(struct snd_timer_instance *timeri)
683{
684
685 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
686 return -EINVAL;
687
688 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
689 return snd_timer_start_slave(timeri, false);
690 else
691 return snd_timer_start1(timeri, false, 0);
692}
693EXPORT_SYMBOL(snd_timer_continue);
694
695
696
697
698int snd_timer_pause(struct snd_timer_instance * timeri)
699{
700 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
701 return snd_timer_stop_slave(timeri, false);
702 else
703 return snd_timer_stop1(timeri, false);
704}
705EXPORT_SYMBOL(snd_timer_pause);
706
707
708
709
710
711
712
713static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
714{
715 struct snd_timer_instance *ti;
716 unsigned long ticks = ~0UL;
717
718 list_for_each_entry(ti, &timer->active_list_head, active_list) {
719 if (ti->flags & SNDRV_TIMER_IFLG_START) {
720 ti->flags &= ~SNDRV_TIMER_IFLG_START;
721 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
722 timer->running++;
723 }
724 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
725 if (ticks > ti->cticks)
726 ticks = ti->cticks;
727 }
728 }
729 if (ticks == ~0UL) {
730 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
731 return;
732 }
733 if (ticks > timer->hw.ticks)
734 ticks = timer->hw.ticks;
735 if (ticks_left != ticks)
736 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
737 timer->sticks = ticks;
738}
739
740
741static void snd_timer_process_callbacks(struct snd_timer *timer,
742 struct list_head *head)
743{
744 struct snd_timer_instance *ti;
745 unsigned long resolution, ticks;
746
747 while (!list_empty(head)) {
748 ti = list_first_entry(head, struct snd_timer_instance,
749 ack_list);
750
751
752 list_del_init(&ti->ack_list);
753
754 if (!(ti->flags & SNDRV_TIMER_IFLG_DEAD)) {
755 ticks = ti->pticks;
756 ti->pticks = 0;
757 resolution = ti->resolution;
758 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
759 spin_unlock(&timer->lock);
760 if (ti->callback)
761 ti->callback(ti, resolution, ticks);
762 spin_lock(&timer->lock);
763 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
764 }
765 }
766}
767
768
769static void snd_timer_clear_callbacks(struct snd_timer *timer,
770 struct list_head *head)
771{
772 unsigned long flags;
773
774 spin_lock_irqsave(&timer->lock, flags);
775 while (!list_empty(head))
776 list_del_init(head->next);
777 spin_unlock_irqrestore(&timer->lock, flags);
778}
779
780
781
782
783
784static void snd_timer_tasklet(unsigned long arg)
785{
786 struct snd_timer *timer = (struct snd_timer *) arg;
787 unsigned long flags;
788
789 if (timer->card && timer->card->shutdown) {
790 snd_timer_clear_callbacks(timer, &timer->sack_list_head);
791 return;
792 }
793
794 spin_lock_irqsave(&timer->lock, flags);
795 snd_timer_process_callbacks(timer, &timer->sack_list_head);
796 spin_unlock_irqrestore(&timer->lock, flags);
797}
798
799
800
801
802
803
804
805void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
806{
807 struct snd_timer_instance *ti, *ts, *tmp;
808 unsigned long resolution;
809 struct list_head *ack_list_head;
810 unsigned long flags;
811 int use_tasklet = 0;
812
813 if (timer == NULL)
814 return;
815
816 if (timer->card && timer->card->shutdown) {
817 snd_timer_clear_callbacks(timer, &timer->ack_list_head);
818 return;
819 }
820
821 spin_lock_irqsave(&timer->lock, flags);
822
823
824 resolution = snd_timer_hw_resolution(timer);
825
826
827
828
829
830
831 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
832 active_list) {
833 if (ti->flags & SNDRV_TIMER_IFLG_DEAD)
834 continue;
835 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
836 continue;
837 ti->pticks += ticks_left;
838 ti->resolution = resolution;
839 if (ti->cticks < ticks_left)
840 ti->cticks = 0;
841 else
842 ti->cticks -= ticks_left;
843 if (ti->cticks)
844 continue;
845 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
846 ti->cticks = ti->ticks;
847 } else {
848 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
849 --timer->running;
850 list_del_init(&ti->active_list);
851 }
852 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
853 (ti->flags & SNDRV_TIMER_IFLG_FAST))
854 ack_list_head = &timer->ack_list_head;
855 else
856 ack_list_head = &timer->sack_list_head;
857 if (list_empty(&ti->ack_list))
858 list_add_tail(&ti->ack_list, ack_list_head);
859 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
860 ts->pticks = ti->pticks;
861 ts->resolution = resolution;
862 if (list_empty(&ts->ack_list))
863 list_add_tail(&ts->ack_list, ack_list_head);
864 }
865 }
866 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
867 snd_timer_reschedule(timer, timer->sticks);
868 if (timer->running) {
869 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
870 timer->hw.stop(timer);
871 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
872 }
873 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
874 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
875
876 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
877 timer->hw.start(timer);
878 }
879 } else {
880 timer->hw.stop(timer);
881 }
882
883
884 snd_timer_process_callbacks(timer, &timer->ack_list_head);
885
886
887 use_tasklet = !list_empty(&timer->sack_list_head);
888 spin_unlock_irqrestore(&timer->lock, flags);
889
890 if (use_tasklet)
891 tasklet_schedule(&timer->task_queue);
892}
893EXPORT_SYMBOL(snd_timer_interrupt);
894
895
896
897
898
899int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
900 struct snd_timer **rtimer)
901{
902 struct snd_timer *timer;
903 int err;
904 static struct snd_device_ops ops = {
905 .dev_free = snd_timer_dev_free,
906 .dev_register = snd_timer_dev_register,
907 .dev_disconnect = snd_timer_dev_disconnect,
908 };
909
910 if (snd_BUG_ON(!tid))
911 return -EINVAL;
912 if (tid->dev_class == SNDRV_TIMER_CLASS_CARD ||
913 tid->dev_class == SNDRV_TIMER_CLASS_PCM) {
914 if (WARN_ON(!card))
915 return -EINVAL;
916 }
917 if (rtimer)
918 *rtimer = NULL;
919 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
920 if (!timer)
921 return -ENOMEM;
922 timer->tmr_class = tid->dev_class;
923 timer->card = card;
924 timer->tmr_device = tid->device;
925 timer->tmr_subdevice = tid->subdevice;
926 if (id)
927 strlcpy(timer->id, id, sizeof(timer->id));
928 timer->sticks = 1;
929 INIT_LIST_HEAD(&timer->device_list);
930 INIT_LIST_HEAD(&timer->open_list_head);
931 INIT_LIST_HEAD(&timer->active_list_head);
932 INIT_LIST_HEAD(&timer->ack_list_head);
933 INIT_LIST_HEAD(&timer->sack_list_head);
934 spin_lock_init(&timer->lock);
935 tasklet_init(&timer->task_queue, snd_timer_tasklet,
936 (unsigned long)timer);
937 timer->max_instances = 1000;
938 if (card != NULL) {
939 timer->module = card->module;
940 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
941 if (err < 0) {
942 snd_timer_free(timer);
943 return err;
944 }
945 }
946 if (rtimer)
947 *rtimer = timer;
948 return 0;
949}
950EXPORT_SYMBOL(snd_timer_new);
951
952static int snd_timer_free(struct snd_timer *timer)
953{
954 if (!timer)
955 return 0;
956
957 mutex_lock(®ister_mutex);
958 if (! list_empty(&timer->open_list_head)) {
959 struct list_head *p, *n;
960 struct snd_timer_instance *ti;
961 pr_warn("ALSA: timer %p is busy?\n", timer);
962 list_for_each_safe(p, n, &timer->open_list_head) {
963 list_del_init(p);
964 ti = list_entry(p, struct snd_timer_instance, open_list);
965 ti->timer = NULL;
966 }
967 }
968 list_del(&timer->device_list);
969 mutex_unlock(®ister_mutex);
970
971 if (timer->private_free)
972 timer->private_free(timer);
973 kfree(timer);
974 return 0;
975}
976
977static int snd_timer_dev_free(struct snd_device *device)
978{
979 struct snd_timer *timer = device->device_data;
980 return snd_timer_free(timer);
981}
982
983static int snd_timer_dev_register(struct snd_device *dev)
984{
985 struct snd_timer *timer = dev->device_data;
986 struct snd_timer *timer1;
987
988 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
989 return -ENXIO;
990 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
991 !timer->hw.resolution && timer->hw.c_resolution == NULL)
992 return -EINVAL;
993
994 mutex_lock(®ister_mutex);
995 list_for_each_entry(timer1, &snd_timer_list, device_list) {
996 if (timer1->tmr_class > timer->tmr_class)
997 break;
998 if (timer1->tmr_class < timer->tmr_class)
999 continue;
1000 if (timer1->card && timer->card) {
1001 if (timer1->card->number > timer->card->number)
1002 break;
1003 if (timer1->card->number < timer->card->number)
1004 continue;
1005 }
1006 if (timer1->tmr_device > timer->tmr_device)
1007 break;
1008 if (timer1->tmr_device < timer->tmr_device)
1009 continue;
1010 if (timer1->tmr_subdevice > timer->tmr_subdevice)
1011 break;
1012 if (timer1->tmr_subdevice < timer->tmr_subdevice)
1013 continue;
1014
1015 mutex_unlock(®ister_mutex);
1016 return -EBUSY;
1017 }
1018 list_add_tail(&timer->device_list, &timer1->device_list);
1019 mutex_unlock(®ister_mutex);
1020 return 0;
1021}
1022
1023static int snd_timer_dev_disconnect(struct snd_device *device)
1024{
1025 struct snd_timer *timer = device->device_data;
1026 struct snd_timer_instance *ti;
1027
1028 mutex_lock(®ister_mutex);
1029 list_del_init(&timer->device_list);
1030
1031 list_for_each_entry(ti, &timer->open_list_head, open_list) {
1032 if (ti->disconnect)
1033 ti->disconnect(ti);
1034 }
1035 mutex_unlock(®ister_mutex);
1036 return 0;
1037}
1038
1039void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
1040{
1041 unsigned long flags;
1042 unsigned long resolution = 0;
1043 struct snd_timer_instance *ti, *ts;
1044
1045 if (timer->card && timer->card->shutdown)
1046 return;
1047 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
1048 return;
1049 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
1050 event > SNDRV_TIMER_EVENT_MRESUME))
1051 return;
1052 spin_lock_irqsave(&timer->lock, flags);
1053 if (event == SNDRV_TIMER_EVENT_MSTART ||
1054 event == SNDRV_TIMER_EVENT_MCONTINUE ||
1055 event == SNDRV_TIMER_EVENT_MRESUME)
1056 resolution = snd_timer_hw_resolution(timer);
1057 list_for_each_entry(ti, &timer->active_list_head, active_list) {
1058 if (ti->ccallback)
1059 ti->ccallback(ti, event, tstamp, resolution);
1060 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1061 if (ts->ccallback)
1062 ts->ccallback(ts, event, tstamp, resolution);
1063 }
1064 spin_unlock_irqrestore(&timer->lock, flags);
1065}
1066EXPORT_SYMBOL(snd_timer_notify);
1067
1068
1069
1070
1071int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1072{
1073 struct snd_timer_id tid;
1074
1075 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1076 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1077 tid.card = -1;
1078 tid.device = device;
1079 tid.subdevice = 0;
1080 return snd_timer_new(NULL, id, &tid, rtimer);
1081}
1082EXPORT_SYMBOL(snd_timer_global_new);
1083
1084int snd_timer_global_free(struct snd_timer *timer)
1085{
1086 return snd_timer_free(timer);
1087}
1088EXPORT_SYMBOL(snd_timer_global_free);
1089
1090int snd_timer_global_register(struct snd_timer *timer)
1091{
1092 struct snd_device dev;
1093
1094 memset(&dev, 0, sizeof(dev));
1095 dev.device_data = timer;
1096 return snd_timer_dev_register(&dev);
1097}
1098EXPORT_SYMBOL(snd_timer_global_register);
1099
1100
1101
1102
1103
1104struct snd_timer_system_private {
1105 struct timer_list tlist;
1106 struct snd_timer *snd_timer;
1107 unsigned long last_expires;
1108 unsigned long last_jiffies;
1109 unsigned long correction;
1110};
1111
1112static void snd_timer_s_function(struct timer_list *t)
1113{
1114 struct snd_timer_system_private *priv = from_timer(priv, t,
1115 tlist);
1116 struct snd_timer *timer = priv->snd_timer;
1117 unsigned long jiff = jiffies;
1118 if (time_after(jiff, priv->last_expires))
1119 priv->correction += (long)jiff - (long)priv->last_expires;
1120 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1121}
1122
1123static int snd_timer_s_start(struct snd_timer * timer)
1124{
1125 struct snd_timer_system_private *priv;
1126 unsigned long njiff;
1127
1128 priv = (struct snd_timer_system_private *) timer->private_data;
1129 njiff = (priv->last_jiffies = jiffies);
1130 if (priv->correction > timer->sticks - 1) {
1131 priv->correction -= timer->sticks - 1;
1132 njiff++;
1133 } else {
1134 njiff += timer->sticks - priv->correction;
1135 priv->correction = 0;
1136 }
1137 priv->last_expires = njiff;
1138 mod_timer(&priv->tlist, njiff);
1139 return 0;
1140}
1141
1142static int snd_timer_s_stop(struct snd_timer * timer)
1143{
1144 struct snd_timer_system_private *priv;
1145 unsigned long jiff;
1146
1147 priv = (struct snd_timer_system_private *) timer->private_data;
1148 del_timer(&priv->tlist);
1149 jiff = jiffies;
1150 if (time_before(jiff, priv->last_expires))
1151 timer->sticks = priv->last_expires - jiff;
1152 else
1153 timer->sticks = 1;
1154 priv->correction = 0;
1155 return 0;
1156}
1157
1158static int snd_timer_s_close(struct snd_timer *timer)
1159{
1160 struct snd_timer_system_private *priv;
1161
1162 priv = (struct snd_timer_system_private *)timer->private_data;
1163 del_timer_sync(&priv->tlist);
1164 return 0;
1165}
1166
1167static struct snd_timer_hardware snd_timer_system =
1168{
1169 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1170 .resolution = 1000000000L / HZ,
1171 .ticks = 10000000L,
1172 .close = snd_timer_s_close,
1173 .start = snd_timer_s_start,
1174 .stop = snd_timer_s_stop
1175};
1176
1177static void snd_timer_free_system(struct snd_timer *timer)
1178{
1179 kfree(timer->private_data);
1180}
1181
1182static int snd_timer_register_system(void)
1183{
1184 struct snd_timer *timer;
1185 struct snd_timer_system_private *priv;
1186 int err;
1187
1188 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1189 if (err < 0)
1190 return err;
1191 strcpy(timer->name, "system timer");
1192 timer->hw = snd_timer_system;
1193 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1194 if (priv == NULL) {
1195 snd_timer_free(timer);
1196 return -ENOMEM;
1197 }
1198 priv->snd_timer = timer;
1199 timer_setup(&priv->tlist, snd_timer_s_function, 0);
1200 timer->private_data = priv;
1201 timer->private_free = snd_timer_free_system;
1202 return snd_timer_global_register(timer);
1203}
1204
1205#ifdef CONFIG_SND_PROC_FS
1206
1207
1208
1209
1210static void snd_timer_proc_read(struct snd_info_entry *entry,
1211 struct snd_info_buffer *buffer)
1212{
1213 struct snd_timer *timer;
1214 struct snd_timer_instance *ti;
1215
1216 mutex_lock(®ister_mutex);
1217 list_for_each_entry(timer, &snd_timer_list, device_list) {
1218 if (timer->card && timer->card->shutdown)
1219 continue;
1220 switch (timer->tmr_class) {
1221 case SNDRV_TIMER_CLASS_GLOBAL:
1222 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1223 break;
1224 case SNDRV_TIMER_CLASS_CARD:
1225 snd_iprintf(buffer, "C%i-%i: ",
1226 timer->card->number, timer->tmr_device);
1227 break;
1228 case SNDRV_TIMER_CLASS_PCM:
1229 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1230 timer->tmr_device, timer->tmr_subdevice);
1231 break;
1232 default:
1233 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1234 timer->card ? timer->card->number : -1,
1235 timer->tmr_device, timer->tmr_subdevice);
1236 }
1237 snd_iprintf(buffer, "%s :", timer->name);
1238 if (timer->hw.resolution)
1239 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1240 timer->hw.resolution / 1000,
1241 timer->hw.resolution % 1000,
1242 timer->hw.ticks);
1243 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1244 snd_iprintf(buffer, " SLAVE");
1245 snd_iprintf(buffer, "\n");
1246 list_for_each_entry(ti, &timer->open_list_head, open_list)
1247 snd_iprintf(buffer, " Client %s : %s\n",
1248 ti->owner ? ti->owner : "unknown",
1249 ti->flags & (SNDRV_TIMER_IFLG_START |
1250 SNDRV_TIMER_IFLG_RUNNING)
1251 ? "running" : "stopped");
1252 }
1253 mutex_unlock(®ister_mutex);
1254}
1255
1256static struct snd_info_entry *snd_timer_proc_entry;
1257
1258static void __init snd_timer_proc_init(void)
1259{
1260 struct snd_info_entry *entry;
1261
1262 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1263 if (entry != NULL) {
1264 entry->c.text.read = snd_timer_proc_read;
1265 if (snd_info_register(entry) < 0) {
1266 snd_info_free_entry(entry);
1267 entry = NULL;
1268 }
1269 }
1270 snd_timer_proc_entry = entry;
1271}
1272
1273static void __exit snd_timer_proc_done(void)
1274{
1275 snd_info_free_entry(snd_timer_proc_entry);
1276}
1277#else
1278#define snd_timer_proc_init()
1279#define snd_timer_proc_done()
1280#endif
1281
1282
1283
1284
1285
1286static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1287 unsigned long resolution,
1288 unsigned long ticks)
1289{
1290 struct snd_timer_user *tu = timeri->callback_data;
1291 struct snd_timer_read *r;
1292 int prev;
1293
1294 spin_lock(&tu->qlock);
1295 if (tu->qused > 0) {
1296 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1297 r = &tu->queue[prev];
1298 if (r->resolution == resolution) {
1299 r->ticks += ticks;
1300 goto __wake;
1301 }
1302 }
1303 if (tu->qused >= tu->queue_size) {
1304 tu->overrun++;
1305 } else {
1306 r = &tu->queue[tu->qtail++];
1307 tu->qtail %= tu->queue_size;
1308 r->resolution = resolution;
1309 r->ticks = ticks;
1310 tu->qused++;
1311 }
1312 __wake:
1313 spin_unlock(&tu->qlock);
1314 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1315 wake_up(&tu->qchange_sleep);
1316}
1317
1318static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1319 struct snd_timer_tread *tread)
1320{
1321 if (tu->qused >= tu->queue_size) {
1322 tu->overrun++;
1323 } else {
1324 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1325 tu->qtail %= tu->queue_size;
1326 tu->qused++;
1327 }
1328}
1329
1330static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1331 int event,
1332 struct timespec *tstamp,
1333 unsigned long resolution)
1334{
1335 struct snd_timer_user *tu = timeri->callback_data;
1336 struct snd_timer_tread r1;
1337 unsigned long flags;
1338
1339 if (event >= SNDRV_TIMER_EVENT_START &&
1340 event <= SNDRV_TIMER_EVENT_PAUSE)
1341 tu->tstamp = *tstamp;
1342 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1343 return;
1344 memset(&r1, 0, sizeof(r1));
1345 r1.event = event;
1346 r1.tstamp = *tstamp;
1347 r1.val = resolution;
1348 spin_lock_irqsave(&tu->qlock, flags);
1349 snd_timer_user_append_to_tqueue(tu, &r1);
1350 spin_unlock_irqrestore(&tu->qlock, flags);
1351 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1352 wake_up(&tu->qchange_sleep);
1353}
1354
1355static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1356{
1357 struct snd_timer_user *tu = timeri->callback_data;
1358
1359 tu->disconnected = true;
1360 wake_up(&tu->qchange_sleep);
1361}
1362
1363static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1364 unsigned long resolution,
1365 unsigned long ticks)
1366{
1367 struct snd_timer_user *tu = timeri->callback_data;
1368 struct snd_timer_tread *r, r1;
1369 struct timespec tstamp;
1370 int prev, append = 0;
1371
1372 memset(&r1, 0, sizeof(r1));
1373 memset(&tstamp, 0, sizeof(tstamp));
1374 spin_lock(&tu->qlock);
1375 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1376 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1377 spin_unlock(&tu->qlock);
1378 return;
1379 }
1380 if (tu->last_resolution != resolution || ticks > 0) {
1381 if (timer_tstamp_monotonic)
1382 ktime_get_ts(&tstamp);
1383 else
1384 getnstimeofday(&tstamp);
1385 }
1386 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1387 tu->last_resolution != resolution) {
1388 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1389 r1.tstamp = tstamp;
1390 r1.val = resolution;
1391 snd_timer_user_append_to_tqueue(tu, &r1);
1392 tu->last_resolution = resolution;
1393 append++;
1394 }
1395 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1396 goto __wake;
1397 if (ticks == 0)
1398 goto __wake;
1399 if (tu->qused > 0) {
1400 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1401 r = &tu->tqueue[prev];
1402 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1403 r->tstamp = tstamp;
1404 r->val += ticks;
1405 append++;
1406 goto __wake;
1407 }
1408 }
1409 r1.event = SNDRV_TIMER_EVENT_TICK;
1410 r1.tstamp = tstamp;
1411 r1.val = ticks;
1412 snd_timer_user_append_to_tqueue(tu, &r1);
1413 append++;
1414 __wake:
1415 spin_unlock(&tu->qlock);
1416 if (append == 0)
1417 return;
1418 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1419 wake_up(&tu->qchange_sleep);
1420}
1421
1422static int realloc_user_queue(struct snd_timer_user *tu, int size)
1423{
1424 struct snd_timer_read *queue = NULL;
1425 struct snd_timer_tread *tqueue = NULL;
1426
1427 if (tu->tread) {
1428 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1429 if (!tqueue)
1430 return -ENOMEM;
1431 } else {
1432 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1433 if (!queue)
1434 return -ENOMEM;
1435 }
1436
1437 spin_lock_irq(&tu->qlock);
1438 kfree(tu->queue);
1439 kfree(tu->tqueue);
1440 tu->queue_size = size;
1441 tu->queue = queue;
1442 tu->tqueue = tqueue;
1443 tu->qhead = tu->qtail = tu->qused = 0;
1444 spin_unlock_irq(&tu->qlock);
1445
1446 return 0;
1447}
1448
1449static int snd_timer_user_open(struct inode *inode, struct file *file)
1450{
1451 struct snd_timer_user *tu;
1452 int err;
1453
1454 err = nonseekable_open(inode, file);
1455 if (err < 0)
1456 return err;
1457
1458 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1459 if (tu == NULL)
1460 return -ENOMEM;
1461 spin_lock_init(&tu->qlock);
1462 init_waitqueue_head(&tu->qchange_sleep);
1463 mutex_init(&tu->ioctl_lock);
1464 tu->ticks = 1;
1465 if (realloc_user_queue(tu, 128) < 0) {
1466 kfree(tu);
1467 return -ENOMEM;
1468 }
1469 file->private_data = tu;
1470 return 0;
1471}
1472
1473static int snd_timer_user_release(struct inode *inode, struct file *file)
1474{
1475 struct snd_timer_user *tu;
1476
1477 if (file->private_data) {
1478 tu = file->private_data;
1479 file->private_data = NULL;
1480 mutex_lock(&tu->ioctl_lock);
1481 if (tu->timeri)
1482 snd_timer_close(tu->timeri);
1483 mutex_unlock(&tu->ioctl_lock);
1484 kfree(tu->queue);
1485 kfree(tu->tqueue);
1486 kfree(tu);
1487 }
1488 return 0;
1489}
1490
1491static void snd_timer_user_zero_id(struct snd_timer_id *id)
1492{
1493 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1494 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1495 id->card = -1;
1496 id->device = -1;
1497 id->subdevice = -1;
1498}
1499
1500static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1501{
1502 id->dev_class = timer->tmr_class;
1503 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1504 id->card = timer->card ? timer->card->number : -1;
1505 id->device = timer->tmr_device;
1506 id->subdevice = timer->tmr_subdevice;
1507}
1508
1509static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1510{
1511 struct snd_timer_id id;
1512 struct snd_timer *timer;
1513 struct list_head *p;
1514
1515 if (copy_from_user(&id, _tid, sizeof(id)))
1516 return -EFAULT;
1517 mutex_lock(®ister_mutex);
1518 if (id.dev_class < 0) {
1519 if (list_empty(&snd_timer_list))
1520 snd_timer_user_zero_id(&id);
1521 else {
1522 timer = list_entry(snd_timer_list.next,
1523 struct snd_timer, device_list);
1524 snd_timer_user_copy_id(&id, timer);
1525 }
1526 } else {
1527 switch (id.dev_class) {
1528 case SNDRV_TIMER_CLASS_GLOBAL:
1529 id.device = id.device < 0 ? 0 : id.device + 1;
1530 list_for_each(p, &snd_timer_list) {
1531 timer = list_entry(p, struct snd_timer, device_list);
1532 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1533 snd_timer_user_copy_id(&id, timer);
1534 break;
1535 }
1536 if (timer->tmr_device >= id.device) {
1537 snd_timer_user_copy_id(&id, timer);
1538 break;
1539 }
1540 }
1541 if (p == &snd_timer_list)
1542 snd_timer_user_zero_id(&id);
1543 break;
1544 case SNDRV_TIMER_CLASS_CARD:
1545 case SNDRV_TIMER_CLASS_PCM:
1546 if (id.card < 0) {
1547 id.card = 0;
1548 } else {
1549 if (id.device < 0) {
1550 id.device = 0;
1551 } else {
1552 if (id.subdevice < 0)
1553 id.subdevice = 0;
1554 else if (id.subdevice < INT_MAX)
1555 id.subdevice++;
1556 }
1557 }
1558 list_for_each(p, &snd_timer_list) {
1559 timer = list_entry(p, struct snd_timer, device_list);
1560 if (timer->tmr_class > id.dev_class) {
1561 snd_timer_user_copy_id(&id, timer);
1562 break;
1563 }
1564 if (timer->tmr_class < id.dev_class)
1565 continue;
1566 if (timer->card->number > id.card) {
1567 snd_timer_user_copy_id(&id, timer);
1568 break;
1569 }
1570 if (timer->card->number < id.card)
1571 continue;
1572 if (timer->tmr_device > id.device) {
1573 snd_timer_user_copy_id(&id, timer);
1574 break;
1575 }
1576 if (timer->tmr_device < id.device)
1577 continue;
1578 if (timer->tmr_subdevice > id.subdevice) {
1579 snd_timer_user_copy_id(&id, timer);
1580 break;
1581 }
1582 if (timer->tmr_subdevice < id.subdevice)
1583 continue;
1584 snd_timer_user_copy_id(&id, timer);
1585 break;
1586 }
1587 if (p == &snd_timer_list)
1588 snd_timer_user_zero_id(&id);
1589 break;
1590 default:
1591 snd_timer_user_zero_id(&id);
1592 }
1593 }
1594 mutex_unlock(®ister_mutex);
1595 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1596 return -EFAULT;
1597 return 0;
1598}
1599
1600static int snd_timer_user_ginfo(struct file *file,
1601 struct snd_timer_ginfo __user *_ginfo)
1602{
1603 struct snd_timer_ginfo *ginfo;
1604 struct snd_timer_id tid;
1605 struct snd_timer *t;
1606 struct list_head *p;
1607 int err = 0;
1608
1609 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1610 if (IS_ERR(ginfo))
1611 return PTR_ERR(ginfo);
1612
1613 tid = ginfo->tid;
1614 memset(ginfo, 0, sizeof(*ginfo));
1615 ginfo->tid = tid;
1616 mutex_lock(®ister_mutex);
1617 t = snd_timer_find(&tid);
1618 if (t != NULL) {
1619 ginfo->card = t->card ? t->card->number : -1;
1620 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1621 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1622 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1623 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1624 ginfo->resolution = t->hw.resolution;
1625 if (t->hw.resolution_min > 0) {
1626 ginfo->resolution_min = t->hw.resolution_min;
1627 ginfo->resolution_max = t->hw.resolution_max;
1628 }
1629 list_for_each(p, &t->open_list_head) {
1630 ginfo->clients++;
1631 }
1632 } else {
1633 err = -ENODEV;
1634 }
1635 mutex_unlock(®ister_mutex);
1636 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1637 err = -EFAULT;
1638 kfree(ginfo);
1639 return err;
1640}
1641
1642static int timer_set_gparams(struct snd_timer_gparams *gparams)
1643{
1644 struct snd_timer *t;
1645 int err;
1646
1647 mutex_lock(®ister_mutex);
1648 t = snd_timer_find(&gparams->tid);
1649 if (!t) {
1650 err = -ENODEV;
1651 goto _error;
1652 }
1653 if (!list_empty(&t->open_list_head)) {
1654 err = -EBUSY;
1655 goto _error;
1656 }
1657 if (!t->hw.set_period) {
1658 err = -ENOSYS;
1659 goto _error;
1660 }
1661 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1662_error:
1663 mutex_unlock(®ister_mutex);
1664 return err;
1665}
1666
1667static int snd_timer_user_gparams(struct file *file,
1668 struct snd_timer_gparams __user *_gparams)
1669{
1670 struct snd_timer_gparams gparams;
1671
1672 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1673 return -EFAULT;
1674 return timer_set_gparams(&gparams);
1675}
1676
1677static int snd_timer_user_gstatus(struct file *file,
1678 struct snd_timer_gstatus __user *_gstatus)
1679{
1680 struct snd_timer_gstatus gstatus;
1681 struct snd_timer_id tid;
1682 struct snd_timer *t;
1683 int err = 0;
1684
1685 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1686 return -EFAULT;
1687 tid = gstatus.tid;
1688 memset(&gstatus, 0, sizeof(gstatus));
1689 gstatus.tid = tid;
1690 mutex_lock(®ister_mutex);
1691 t = snd_timer_find(&tid);
1692 if (t != NULL) {
1693 spin_lock_irq(&t->lock);
1694 gstatus.resolution = snd_timer_hw_resolution(t);
1695 if (t->hw.precise_resolution) {
1696 t->hw.precise_resolution(t, &gstatus.resolution_num,
1697 &gstatus.resolution_den);
1698 } else {
1699 gstatus.resolution_num = gstatus.resolution;
1700 gstatus.resolution_den = 1000000000uL;
1701 }
1702 spin_unlock_irq(&t->lock);
1703 } else {
1704 err = -ENODEV;
1705 }
1706 mutex_unlock(®ister_mutex);
1707 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1708 err = -EFAULT;
1709 return err;
1710}
1711
1712static int snd_timer_user_tselect(struct file *file,
1713 struct snd_timer_select __user *_tselect)
1714{
1715 struct snd_timer_user *tu;
1716 struct snd_timer_select tselect;
1717 char str[32];
1718 int err = 0;
1719
1720 tu = file->private_data;
1721 if (tu->timeri) {
1722 snd_timer_close(tu->timeri);
1723 tu->timeri = NULL;
1724 }
1725 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1726 err = -EFAULT;
1727 goto __err;
1728 }
1729 sprintf(str, "application %i", current->pid);
1730 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1731 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1732 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1733 if (err < 0)
1734 goto __err;
1735
1736 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1737 tu->timeri->callback = tu->tread
1738 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1739 tu->timeri->ccallback = snd_timer_user_ccallback;
1740 tu->timeri->callback_data = (void *)tu;
1741 tu->timeri->disconnect = snd_timer_user_disconnect;
1742
1743 __err:
1744 return err;
1745}
1746
1747static int snd_timer_user_info(struct file *file,
1748 struct snd_timer_info __user *_info)
1749{
1750 struct snd_timer_user *tu;
1751 struct snd_timer_info *info;
1752 struct snd_timer *t;
1753 int err = 0;
1754
1755 tu = file->private_data;
1756 if (!tu->timeri)
1757 return -EBADFD;
1758 t = tu->timeri->timer;
1759 if (!t)
1760 return -EBADFD;
1761
1762 info = kzalloc(sizeof(*info), GFP_KERNEL);
1763 if (! info)
1764 return -ENOMEM;
1765 info->card = t->card ? t->card->number : -1;
1766 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1767 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1768 strlcpy(info->id, t->id, sizeof(info->id));
1769 strlcpy(info->name, t->name, sizeof(info->name));
1770 info->resolution = t->hw.resolution;
1771 if (copy_to_user(_info, info, sizeof(*_info)))
1772 err = -EFAULT;
1773 kfree(info);
1774 return err;
1775}
1776
1777static int snd_timer_user_params(struct file *file,
1778 struct snd_timer_params __user *_params)
1779{
1780 struct snd_timer_user *tu;
1781 struct snd_timer_params params;
1782 struct snd_timer *t;
1783 int err;
1784
1785 tu = file->private_data;
1786 if (!tu->timeri)
1787 return -EBADFD;
1788 t = tu->timeri->timer;
1789 if (!t)
1790 return -EBADFD;
1791 if (copy_from_user(¶ms, _params, sizeof(params)))
1792 return -EFAULT;
1793 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1794 u64 resolution;
1795
1796 if (params.ticks < 1) {
1797 err = -EINVAL;
1798 goto _end;
1799 }
1800
1801
1802 resolution = snd_timer_resolution(tu->timeri);
1803 resolution *= params.ticks;
1804 if (resolution < 1000000) {
1805 err = -EINVAL;
1806 goto _end;
1807 }
1808 }
1809 if (params.queue_size > 0 &&
1810 (params.queue_size < 32 || params.queue_size > 1024)) {
1811 err = -EINVAL;
1812 goto _end;
1813 }
1814 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1815 (1<<SNDRV_TIMER_EVENT_TICK)|
1816 (1<<SNDRV_TIMER_EVENT_START)|
1817 (1<<SNDRV_TIMER_EVENT_STOP)|
1818 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1819 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1820 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1821 (1<<SNDRV_TIMER_EVENT_RESUME)|
1822 (1<<SNDRV_TIMER_EVENT_MSTART)|
1823 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1824 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1825 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1826 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1827 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1828 err = -EINVAL;
1829 goto _end;
1830 }
1831 snd_timer_stop(tu->timeri);
1832 spin_lock_irq(&t->lock);
1833 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1834 SNDRV_TIMER_IFLG_EXCLUSIVE|
1835 SNDRV_TIMER_IFLG_EARLY_EVENT);
1836 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1837 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1838 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1839 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1840 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1841 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1842 spin_unlock_irq(&t->lock);
1843 if (params.queue_size > 0 &&
1844 (unsigned int)tu->queue_size != params.queue_size) {
1845 err = realloc_user_queue(tu, params.queue_size);
1846 if (err < 0)
1847 goto _end;
1848 }
1849 spin_lock_irq(&tu->qlock);
1850 tu->qhead = tu->qtail = tu->qused = 0;
1851 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1852 if (tu->tread) {
1853 struct snd_timer_tread tread;
1854 memset(&tread, 0, sizeof(tread));
1855 tread.event = SNDRV_TIMER_EVENT_EARLY;
1856 tread.tstamp.tv_sec = 0;
1857 tread.tstamp.tv_nsec = 0;
1858 tread.val = 0;
1859 snd_timer_user_append_to_tqueue(tu, &tread);
1860 } else {
1861 struct snd_timer_read *r = &tu->queue[0];
1862 r->resolution = 0;
1863 r->ticks = 0;
1864 tu->qused++;
1865 tu->qtail++;
1866 }
1867 }
1868 tu->filter = params.filter;
1869 tu->ticks = params.ticks;
1870 spin_unlock_irq(&tu->qlock);
1871 err = 0;
1872 _end:
1873 if (copy_to_user(_params, ¶ms, sizeof(params)))
1874 return -EFAULT;
1875 return err;
1876}
1877
1878static int snd_timer_user_status(struct file *file,
1879 struct snd_timer_status __user *_status)
1880{
1881 struct snd_timer_user *tu;
1882 struct snd_timer_status status;
1883
1884 tu = file->private_data;
1885 if (!tu->timeri)
1886 return -EBADFD;
1887 memset(&status, 0, sizeof(status));
1888 status.tstamp = tu->tstamp;
1889 status.resolution = snd_timer_resolution(tu->timeri);
1890 status.lost = tu->timeri->lost;
1891 status.overrun = tu->overrun;
1892 spin_lock_irq(&tu->qlock);
1893 status.queue = tu->qused;
1894 spin_unlock_irq(&tu->qlock);
1895 if (copy_to_user(_status, &status, sizeof(status)))
1896 return -EFAULT;
1897 return 0;
1898}
1899
1900static int snd_timer_user_start(struct file *file)
1901{
1902 int err;
1903 struct snd_timer_user *tu;
1904
1905 tu = file->private_data;
1906 if (!tu->timeri)
1907 return -EBADFD;
1908 snd_timer_stop(tu->timeri);
1909 tu->timeri->lost = 0;
1910 tu->last_resolution = 0;
1911 err = snd_timer_start(tu->timeri, tu->ticks);
1912 if (err < 0)
1913 return err;
1914 return 0;
1915}
1916
1917static int snd_timer_user_stop(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 err = snd_timer_stop(tu->timeri);
1926 if (err < 0)
1927 return err;
1928 return 0;
1929}
1930
1931static int snd_timer_user_continue(struct file *file)
1932{
1933 int err;
1934 struct snd_timer_user *tu;
1935
1936 tu = file->private_data;
1937 if (!tu->timeri)
1938 return -EBADFD;
1939
1940 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1941 return snd_timer_user_start(file);
1942 tu->timeri->lost = 0;
1943 err = snd_timer_continue(tu->timeri);
1944 if (err < 0)
1945 return err;
1946 return 0;
1947}
1948
1949static int snd_timer_user_pause(struct file *file)
1950{
1951 int err;
1952 struct snd_timer_user *tu;
1953
1954 tu = file->private_data;
1955 if (!tu->timeri)
1956 return -EBADFD;
1957 err = snd_timer_pause(tu->timeri);
1958 if (err < 0)
1959 return err;
1960 return 0;
1961}
1962
1963enum {
1964 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1965 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1966 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1967 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1968};
1969
1970static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1971 unsigned long arg)
1972{
1973 struct snd_timer_user *tu;
1974 void __user *argp = (void __user *)arg;
1975 int __user *p = argp;
1976
1977 tu = file->private_data;
1978 switch (cmd) {
1979 case SNDRV_TIMER_IOCTL_PVERSION:
1980 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1981 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1982 return snd_timer_user_next_device(argp);
1983 case SNDRV_TIMER_IOCTL_TREAD:
1984 {
1985 int xarg, old_tread;
1986
1987 if (tu->timeri)
1988 return -EBUSY;
1989 if (get_user(xarg, p))
1990 return -EFAULT;
1991 old_tread = tu->tread;
1992 tu->tread = xarg ? 1 : 0;
1993 if (tu->tread != old_tread &&
1994 realloc_user_queue(tu, tu->queue_size) < 0) {
1995 tu->tread = old_tread;
1996 return -ENOMEM;
1997 }
1998 return 0;
1999 }
2000 case SNDRV_TIMER_IOCTL_GINFO:
2001 return snd_timer_user_ginfo(file, argp);
2002 case SNDRV_TIMER_IOCTL_GPARAMS:
2003 return snd_timer_user_gparams(file, argp);
2004 case SNDRV_TIMER_IOCTL_GSTATUS:
2005 return snd_timer_user_gstatus(file, argp);
2006 case SNDRV_TIMER_IOCTL_SELECT:
2007 return snd_timer_user_tselect(file, argp);
2008 case SNDRV_TIMER_IOCTL_INFO:
2009 return snd_timer_user_info(file, argp);
2010 case SNDRV_TIMER_IOCTL_PARAMS:
2011 return snd_timer_user_params(file, argp);
2012 case SNDRV_TIMER_IOCTL_STATUS:
2013 return snd_timer_user_status(file, argp);
2014 case SNDRV_TIMER_IOCTL_START:
2015 case SNDRV_TIMER_IOCTL_START_OLD:
2016 return snd_timer_user_start(file);
2017 case SNDRV_TIMER_IOCTL_STOP:
2018 case SNDRV_TIMER_IOCTL_STOP_OLD:
2019 return snd_timer_user_stop(file);
2020 case SNDRV_TIMER_IOCTL_CONTINUE:
2021 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
2022 return snd_timer_user_continue(file);
2023 case SNDRV_TIMER_IOCTL_PAUSE:
2024 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
2025 return snd_timer_user_pause(file);
2026 }
2027 return -ENOTTY;
2028}
2029
2030static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
2031 unsigned long arg)
2032{
2033 struct snd_timer_user *tu = file->private_data;
2034 long ret;
2035
2036 mutex_lock(&tu->ioctl_lock);
2037 ret = __snd_timer_user_ioctl(file, cmd, arg);
2038 mutex_unlock(&tu->ioctl_lock);
2039 return ret;
2040}
2041
2042static int snd_timer_user_fasync(int fd, struct file * file, int on)
2043{
2044 struct snd_timer_user *tu;
2045
2046 tu = file->private_data;
2047 return fasync_helper(fd, file, on, &tu->fasync);
2048}
2049
2050static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
2051 size_t count, loff_t *offset)
2052{
2053 struct snd_timer_user *tu;
2054 long result = 0, unit;
2055 int qhead;
2056 int err = 0;
2057
2058 tu = file->private_data;
2059 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
2060 mutex_lock(&tu->ioctl_lock);
2061 spin_lock_irq(&tu->qlock);
2062 while ((long)count - result >= unit) {
2063 while (!tu->qused) {
2064 wait_queue_t wait;
2065
2066 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
2067 err = -EAGAIN;
2068 goto _error;
2069 }
2070
2071 set_current_state(TASK_INTERRUPTIBLE);
2072 init_waitqueue_entry(&wait, current);
2073 add_wait_queue(&tu->qchange_sleep, &wait);
2074
2075 spin_unlock_irq(&tu->qlock);
2076 mutex_unlock(&tu->ioctl_lock);
2077 schedule();
2078 mutex_lock(&tu->ioctl_lock);
2079 spin_lock_irq(&tu->qlock);
2080
2081 remove_wait_queue(&tu->qchange_sleep, &wait);
2082
2083 if (tu->disconnected) {
2084 err = -ENODEV;
2085 goto _error;
2086 }
2087 if (signal_pending(current)) {
2088 err = -ERESTARTSYS;
2089 goto _error;
2090 }
2091 }
2092
2093 qhead = tu->qhead++;
2094 tu->qhead %= tu->queue_size;
2095 tu->qused--;
2096 spin_unlock_irq(&tu->qlock);
2097
2098 if (tu->tread) {
2099 if (copy_to_user(buffer, &tu->tqueue[qhead],
2100 sizeof(struct snd_timer_tread)))
2101 err = -EFAULT;
2102 } else {
2103 if (copy_to_user(buffer, &tu->queue[qhead],
2104 sizeof(struct snd_timer_read)))
2105 err = -EFAULT;
2106 }
2107
2108 spin_lock_irq(&tu->qlock);
2109 if (err < 0)
2110 goto _error;
2111 result += unit;
2112 buffer += unit;
2113 }
2114 _error:
2115 spin_unlock_irq(&tu->qlock);
2116 mutex_unlock(&tu->ioctl_lock);
2117 return result > 0 ? result : err;
2118}
2119
2120static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
2121{
2122 unsigned int mask;
2123 struct snd_timer_user *tu;
2124
2125 tu = file->private_data;
2126
2127 poll_wait(file, &tu->qchange_sleep, wait);
2128
2129 mask = 0;
2130 spin_lock_irq(&tu->qlock);
2131 if (tu->qused)
2132 mask |= POLLIN | POLLRDNORM;
2133 if (tu->disconnected)
2134 mask |= POLLERR;
2135 spin_unlock_irq(&tu->qlock);
2136
2137 return mask;
2138}
2139
2140#ifdef CONFIG_COMPAT
2141#include "timer_compat.c"
2142#else
2143#define snd_timer_user_ioctl_compat NULL
2144#endif
2145
2146static const struct file_operations snd_timer_f_ops =
2147{
2148 .owner = THIS_MODULE,
2149 .read = snd_timer_user_read,
2150 .open = snd_timer_user_open,
2151 .release = snd_timer_user_release,
2152 .llseek = no_llseek,
2153 .poll = snd_timer_user_poll,
2154 .unlocked_ioctl = snd_timer_user_ioctl,
2155 .compat_ioctl = snd_timer_user_ioctl_compat,
2156 .fasync = snd_timer_user_fasync,
2157};
2158
2159
2160static void snd_timer_free_all(void)
2161{
2162 struct snd_timer *timer, *n;
2163
2164 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2165 snd_timer_free(timer);
2166}
2167
2168static struct device timer_dev;
2169
2170
2171
2172
2173
2174static int __init alsa_timer_init(void)
2175{
2176 int err;
2177
2178 snd_device_initialize(&timer_dev, NULL);
2179 dev_set_name(&timer_dev, "timer");
2180
2181#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2182 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2183 "system timer");
2184#endif
2185
2186 err = snd_timer_register_system();
2187 if (err < 0) {
2188 pr_err("ALSA: unable to register system timer (%i)\n", err);
2189 goto put_timer;
2190 }
2191
2192 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2193 &snd_timer_f_ops, NULL, &timer_dev);
2194 if (err < 0) {
2195 pr_err("ALSA: unable to register timer device (%i)\n", err);
2196 snd_timer_free_all();
2197 goto put_timer;
2198 }
2199
2200 snd_timer_proc_init();
2201 return 0;
2202
2203put_timer:
2204 put_device(&timer_dev);
2205 return err;
2206}
2207
2208static void __exit alsa_timer_exit(void)
2209{
2210 snd_unregister_device(&timer_dev);
2211 snd_timer_free_all();
2212 put_device(&timer_dev);
2213 snd_timer_proc_done();
2214#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2215 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2216#endif
2217}
2218
2219module_init(alsa_timer_init)
2220module_exit(alsa_timer_exit)
2221
