Linux-libre 5.4.47-gnu
[librecmc/linux-libre.git] / sound / core / timer.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Timers abstract layer
4  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5  */
6
7 #include <linux/delay.h>
8 #include <linux/init.h>
9 #include <linux/slab.h>
10 #include <linux/time.h>
11 #include <linux/mutex.h>
12 #include <linux/device.h>
13 #include <linux/module.h>
14 #include <linux/string.h>
15 #include <linux/sched/signal.h>
16 #include <sound/core.h>
17 #include <sound/timer.h>
18 #include <sound/control.h>
19 #include <sound/info.h>
20 #include <sound/minors.h>
21 #include <sound/initval.h>
22 #include <linux/kmod.h>
23
24 /* internal flags */
25 #define SNDRV_TIMER_IFLG_PAUSED         0x00010000
26 #define SNDRV_TIMER_IFLG_DEAD           0x00020000
27
28 #if IS_ENABLED(CONFIG_SND_HRTIMER)
29 #define DEFAULT_TIMER_LIMIT 4
30 #else
31 #define DEFAULT_TIMER_LIMIT 1
32 #endif
33
34 static int timer_limit = DEFAULT_TIMER_LIMIT;
35 static int timer_tstamp_monotonic = 1;
36 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
37 MODULE_DESCRIPTION("ALSA timer interface");
38 MODULE_LICENSE("GPL");
39 module_param(timer_limit, int, 0444);
40 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
41 module_param(timer_tstamp_monotonic, int, 0444);
42 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
43
44 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
45 MODULE_ALIAS("devname:snd/timer");
46
47 struct snd_timer_user {
48         struct snd_timer_instance *timeri;
49         int tread;              /* enhanced read with timestamps and events */
50         unsigned long ticks;
51         unsigned long overrun;
52         int qhead;
53         int qtail;
54         int qused;
55         int queue_size;
56         bool disconnected;
57         struct snd_timer_read *queue;
58         struct snd_timer_tread *tqueue;
59         spinlock_t qlock;
60         unsigned long last_resolution;
61         unsigned int filter;
62         struct timespec tstamp;         /* trigger tstamp */
63         wait_queue_head_t qchange_sleep;
64         struct fasync_struct *fasync;
65         struct mutex ioctl_lock;
66 };
67
68 /* list of timers */
69 static LIST_HEAD(snd_timer_list);
70
71 /* list of slave instances */
72 static LIST_HEAD(snd_timer_slave_list);
73
74 /* lock for slave active lists */
75 static DEFINE_SPINLOCK(slave_active_lock);
76
77 #define MAX_SLAVE_INSTANCES     1000
78 static int num_slaves;
79
80 static DEFINE_MUTEX(register_mutex);
81
82 static int snd_timer_free(struct snd_timer *timer);
83 static int snd_timer_dev_free(struct snd_device *device);
84 static int snd_timer_dev_register(struct snd_device *device);
85 static int snd_timer_dev_disconnect(struct snd_device *device);
86
87 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
88
89 /*
90  * create a timer instance with the given owner string.
91  * when timer is not NULL, increments the module counter
92  */
93 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
94                                                          struct snd_timer *timer)
95 {
96         struct snd_timer_instance *timeri;
97         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
98         if (timeri == NULL)
99                 return NULL;
100         timeri->owner = kstrdup(owner, GFP_KERNEL);
101         if (! timeri->owner) {
102                 kfree(timeri);
103                 return NULL;
104         }
105         INIT_LIST_HEAD(&timeri->open_list);
106         INIT_LIST_HEAD(&timeri->active_list);
107         INIT_LIST_HEAD(&timeri->ack_list);
108         INIT_LIST_HEAD(&timeri->slave_list_head);
109         INIT_LIST_HEAD(&timeri->slave_active_head);
110
111         timeri->timer = timer;
112         if (timer && !try_module_get(timer->module)) {
113                 kfree(timeri->owner);
114                 kfree(timeri);
115                 return NULL;
116         }
117
118         return timeri;
119 }
120
121 /*
122  * find a timer instance from the given timer id
123  */
124 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
125 {
126         struct snd_timer *timer = NULL;
127
128         list_for_each_entry(timer, &snd_timer_list, device_list) {
129                 if (timer->tmr_class != tid->dev_class)
130                         continue;
131                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
132                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
133                     (timer->card == NULL ||
134                      timer->card->number != tid->card))
135                         continue;
136                 if (timer->tmr_device != tid->device)
137                         continue;
138                 if (timer->tmr_subdevice != tid->subdevice)
139                         continue;
140                 return timer;
141         }
142         return NULL;
143 }
144
145 #ifdef CONFIG_MODULES
146
147 static void snd_timer_request(struct snd_timer_id *tid)
148 {
149         switch (tid->dev_class) {
150         case SNDRV_TIMER_CLASS_GLOBAL:
151                 if (tid->device < timer_limit)
152                         request_module("snd-timer-%i", tid->device);
153                 break;
154         case SNDRV_TIMER_CLASS_CARD:
155         case SNDRV_TIMER_CLASS_PCM:
156                 if (tid->card < snd_ecards_limit)
157                         request_module("snd-card-%i", tid->card);
158                 break;
159         default:
160                 break;
161         }
162 }
163
164 #endif
165
166 /*
167  * look for a master instance matching with the slave id of the given slave.
168  * when found, relink the open_link of the slave.
169  *
170  * call this with register_mutex down.
171  */
172 static int snd_timer_check_slave(struct snd_timer_instance *slave)
173 {
174         struct snd_timer *timer;
175         struct snd_timer_instance *master;
176
177         /* FIXME: it's really dumb to look up all entries.. */
178         list_for_each_entry(timer, &snd_timer_list, device_list) {
179                 list_for_each_entry(master, &timer->open_list_head, open_list) {
180                         if (slave->slave_class == master->slave_class &&
181                             slave->slave_id == master->slave_id) {
182                                 if (master->timer->num_instances >=
183                                     master->timer->max_instances)
184                                         return -EBUSY;
185                                 list_move_tail(&slave->open_list,
186                                                &master->slave_list_head);
187                                 master->timer->num_instances++;
188                                 spin_lock_irq(&slave_active_lock);
189                                 slave->master = master;
190                                 slave->timer = master->timer;
191                                 spin_unlock_irq(&slave_active_lock);
192                                 return 0;
193                         }
194                 }
195         }
196         return 0;
197 }
198
199 /*
200  * look for slave instances matching with the slave id of the given master.
201  * when found, relink the open_link of slaves.
202  *
203  * call this with register_mutex down.
204  */
205 static int snd_timer_check_master(struct snd_timer_instance *master)
206 {
207         struct snd_timer_instance *slave, *tmp;
208
209         /* check all pending slaves */
210         list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
211                 if (slave->slave_class == master->slave_class &&
212                     slave->slave_id == master->slave_id) {
213                         if (master->timer->num_instances >=
214                             master->timer->max_instances)
215                                 return -EBUSY;
216                         list_move_tail(&slave->open_list, &master->slave_list_head);
217                         master->timer->num_instances++;
218                         spin_lock_irq(&slave_active_lock);
219                         spin_lock(&master->timer->lock);
220                         slave->master = master;
221                         slave->timer = master->timer;
222                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
223                                 list_add_tail(&slave->active_list,
224                                               &master->slave_active_head);
225                         spin_unlock(&master->timer->lock);
226                         spin_unlock_irq(&slave_active_lock);
227                 }
228         }
229         return 0;
230 }
231
232 static int snd_timer_close_locked(struct snd_timer_instance *timeri,
233                                   struct device **card_devp_to_put);
234
235 /*
236  * open a timer instance
237  * when opening a master, the slave id must be here given.
238  */
239 int snd_timer_open(struct snd_timer_instance **ti,
240                    char *owner, struct snd_timer_id *tid,
241                    unsigned int slave_id)
242 {
243         struct snd_timer *timer;
244         struct snd_timer_instance *timeri = NULL;
245         struct device *card_dev_to_put = NULL;
246         int err;
247
248         mutex_lock(&register_mutex);
249         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
250                 /* open a slave instance */
251                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
252                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
253                         pr_debug("ALSA: timer: invalid slave class %i\n",
254                                  tid->dev_sclass);
255                         err = -EINVAL;
256                         goto unlock;
257                 }
258                 if (num_slaves >= MAX_SLAVE_INSTANCES) {
259                         err = -EBUSY;
260                         goto unlock;
261                 }
262                 timeri = snd_timer_instance_new(owner, NULL);
263                 if (!timeri) {
264                         err = -ENOMEM;
265                         goto unlock;
266                 }
267                 timeri->slave_class = tid->dev_sclass;
268                 timeri->slave_id = tid->device;
269                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
270                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
271                 num_slaves++;
272                 err = snd_timer_check_slave(timeri);
273                 if (err < 0) {
274                         snd_timer_close_locked(timeri, &card_dev_to_put);
275                         timeri = NULL;
276                 }
277                 goto unlock;
278         }
279
280         /* open a master instance */
281         timer = snd_timer_find(tid);
282 #ifdef CONFIG_MODULES
283         if (!timer) {
284                 mutex_unlock(&register_mutex);
285                 snd_timer_request(tid);
286                 mutex_lock(&register_mutex);
287                 timer = snd_timer_find(tid);
288         }
289 #endif
290         if (!timer) {
291                 err = -ENODEV;
292                 goto unlock;
293         }
294         if (!list_empty(&timer->open_list_head)) {
295                 struct snd_timer_instance *t =
296                         list_entry(timer->open_list_head.next,
297                                     struct snd_timer_instance, open_list);
298                 if (t->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
299                         err = -EBUSY;
300                         goto unlock;
301                 }
302         }
303         if (timer->num_instances >= timer->max_instances) {
304                 err = -EBUSY;
305                 goto unlock;
306         }
307         timeri = snd_timer_instance_new(owner, timer);
308         if (!timeri) {
309                 err = -ENOMEM;
310                 goto unlock;
311         }
312         /* take a card refcount for safe disconnection */
313         if (timer->card)
314                 get_device(&timer->card->card_dev);
315         timeri->slave_class = tid->dev_sclass;
316         timeri->slave_id = slave_id;
317
318         if (list_empty(&timer->open_list_head) && timer->hw.open) {
319                 err = timer->hw.open(timer);
320                 if (err) {
321                         kfree(timeri->owner);
322                         kfree(timeri);
323                         timeri = NULL;
324
325                         if (timer->card)
326                                 card_dev_to_put = &timer->card->card_dev;
327                         module_put(timer->module);
328                         goto unlock;
329                 }
330         }
331
332         list_add_tail(&timeri->open_list, &timer->open_list_head);
333         timer->num_instances++;
334         err = snd_timer_check_master(timeri);
335         if (err < 0) {
336                 snd_timer_close_locked(timeri, &card_dev_to_put);
337                 timeri = NULL;
338         }
339
340  unlock:
341         mutex_unlock(&register_mutex);
342         /* put_device() is called after unlock for avoiding deadlock */
343         if (card_dev_to_put)
344                 put_device(card_dev_to_put);
345         *ti = timeri;
346         return err;
347 }
348 EXPORT_SYMBOL(snd_timer_open);
349
350 /*
351  * close a timer instance
352  * call this with register_mutex down.
353  */
354 static int snd_timer_close_locked(struct snd_timer_instance *timeri,
355                                   struct device **card_devp_to_put)
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         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
368                 num_slaves--;
369
370         /* force to stop the timer */
371         snd_timer_stop(timeri);
372
373         if (timer) {
374                 timer->num_instances--;
375                 /* wait, until the active callback is finished */
376                 spin_lock_irq(&timer->lock);
377                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
378                         spin_unlock_irq(&timer->lock);
379                         udelay(10);
380                         spin_lock_irq(&timer->lock);
381                 }
382                 spin_unlock_irq(&timer->lock);
383
384                 /* remove slave links */
385                 spin_lock_irq(&slave_active_lock);
386                 spin_lock(&timer->lock);
387                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
388                                          open_list) {
389                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
390                         timer->num_instances--;
391                         slave->master = NULL;
392                         slave->timer = NULL;
393                         list_del_init(&slave->ack_list);
394                         list_del_init(&slave->active_list);
395                 }
396                 spin_unlock(&timer->lock);
397                 spin_unlock_irq(&slave_active_lock);
398
399                 /* slave doesn't need to release timer resources below */
400                 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
401                         timer = NULL;
402         }
403
404         if (timeri->private_free)
405                 timeri->private_free(timeri);
406         kfree(timeri->owner);
407         kfree(timeri);
408
409         if (timer) {
410                 if (list_empty(&timer->open_list_head) && timer->hw.close)
411                         timer->hw.close(timer);
412                 /* release a card refcount for safe disconnection */
413                 if (timer->card)
414                         *card_devp_to_put = &timer->card->card_dev;
415                 module_put(timer->module);
416         }
417
418         return 0;
419 }
420
421 /*
422  * close a timer instance
423  */
424 int snd_timer_close(struct snd_timer_instance *timeri)
425 {
426         struct device *card_dev_to_put = NULL;
427         int err;
428
429         if (snd_BUG_ON(!timeri))
430                 return -ENXIO;
431
432         mutex_lock(&register_mutex);
433         err = snd_timer_close_locked(timeri, &card_dev_to_put);
434         mutex_unlock(&register_mutex);
435         /* put_device() is called after unlock for avoiding deadlock */
436         if (card_dev_to_put)
437                 put_device(card_dev_to_put);
438         return err;
439 }
440 EXPORT_SYMBOL(snd_timer_close);
441
442 static unsigned long snd_timer_hw_resolution(struct snd_timer *timer)
443 {
444         if (timer->hw.c_resolution)
445                 return timer->hw.c_resolution(timer);
446         else
447                 return timer->hw.resolution;
448 }
449
450 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
451 {
452         struct snd_timer * timer;
453         unsigned long ret = 0;
454         unsigned long flags;
455
456         if (timeri == NULL)
457                 return 0;
458         timer = timeri->timer;
459         if (timer) {
460                 spin_lock_irqsave(&timer->lock, flags);
461                 ret = snd_timer_hw_resolution(timer);
462                 spin_unlock_irqrestore(&timer->lock, flags);
463         }
464         return ret;
465 }
466 EXPORT_SYMBOL(snd_timer_resolution);
467
468 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
469 {
470         struct snd_timer *timer = ti->timer;
471         unsigned long resolution = 0;
472         struct snd_timer_instance *ts;
473         struct timespec tstamp;
474
475         if (timer_tstamp_monotonic)
476                 ktime_get_ts(&tstamp);
477         else
478                 getnstimeofday(&tstamp);
479         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
480                        event > SNDRV_TIMER_EVENT_PAUSE))
481                 return;
482         if (timer &&
483             (event == SNDRV_TIMER_EVENT_START ||
484              event == SNDRV_TIMER_EVENT_CONTINUE))
485                 resolution = snd_timer_hw_resolution(timer);
486         if (ti->ccallback)
487                 ti->ccallback(ti, event, &tstamp, resolution);
488         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
489                 return;
490         if (timer == NULL)
491                 return;
492         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
493                 return;
494         list_for_each_entry(ts, &ti->slave_active_head, active_list)
495                 if (ts->ccallback)
496                         ts->ccallback(ts, event + 100, &tstamp, resolution);
497 }
498
499 /* start/continue a master timer */
500 static int snd_timer_start1(struct snd_timer_instance *timeri,
501                             bool start, unsigned long ticks)
502 {
503         struct snd_timer *timer;
504         int result;
505         unsigned long flags;
506
507         timer = timeri->timer;
508         if (!timer)
509                 return -EINVAL;
510
511         spin_lock_irqsave(&timer->lock, flags);
512         if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
513                 result = -EINVAL;
514                 goto unlock;
515         }
516         if (timer->card && timer->card->shutdown) {
517                 result = -ENODEV;
518                 goto unlock;
519         }
520         if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
521                              SNDRV_TIMER_IFLG_START)) {
522                 result = -EBUSY;
523                 goto unlock;
524         }
525
526         if (start)
527                 timeri->ticks = timeri->cticks = ticks;
528         else if (!timeri->cticks)
529                 timeri->cticks = 1;
530         timeri->pticks = 0;
531
532         list_move_tail(&timeri->active_list, &timer->active_list_head);
533         if (timer->running) {
534                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
535                         goto __start_now;
536                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
537                 timeri->flags |= SNDRV_TIMER_IFLG_START;
538                 result = 1; /* delayed start */
539         } else {
540                 if (start)
541                         timer->sticks = ticks;
542                 timer->hw.start(timer);
543               __start_now:
544                 timer->running++;
545                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
546                 result = 0;
547         }
548         snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
549                           SNDRV_TIMER_EVENT_CONTINUE);
550  unlock:
551         spin_unlock_irqrestore(&timer->lock, flags);
552         return result;
553 }
554
555 /* start/continue a slave timer */
556 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
557                                  bool start)
558 {
559         unsigned long flags;
560         int err;
561
562         spin_lock_irqsave(&slave_active_lock, flags);
563         if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
564                 err = -EINVAL;
565                 goto unlock;
566         }
567         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
568                 err = -EBUSY;
569                 goto unlock;
570         }
571         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
572         if (timeri->master && timeri->timer) {
573                 spin_lock(&timeri->timer->lock);
574                 list_add_tail(&timeri->active_list,
575                               &timeri->master->slave_active_head);
576                 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
577                                   SNDRV_TIMER_EVENT_CONTINUE);
578                 spin_unlock(&timeri->timer->lock);
579         }
580         err = 1; /* delayed start */
581  unlock:
582         spin_unlock_irqrestore(&slave_active_lock, flags);
583         return err;
584 }
585
586 /* stop/pause a master timer */
587 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
588 {
589         struct snd_timer *timer;
590         int result = 0;
591         unsigned long flags;
592
593         timer = timeri->timer;
594         if (!timer)
595                 return -EINVAL;
596         spin_lock_irqsave(&timer->lock, flags);
597         if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
598                                SNDRV_TIMER_IFLG_START))) {
599                 result = -EBUSY;
600                 goto unlock;
601         }
602         list_del_init(&timeri->ack_list);
603         list_del_init(&timeri->active_list);
604         if (timer->card && timer->card->shutdown)
605                 goto unlock;
606         if (stop) {
607                 timeri->cticks = timeri->ticks;
608                 timeri->pticks = 0;
609         }
610         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
611             !(--timer->running)) {
612                 timer->hw.stop(timer);
613                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
614                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
615                         snd_timer_reschedule(timer, 0);
616                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
617                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
618                                 timer->hw.start(timer);
619                         }
620                 }
621         }
622         timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
623         if (stop)
624                 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
625         else
626                 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
627         snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
628                           SNDRV_TIMER_EVENT_PAUSE);
629  unlock:
630         spin_unlock_irqrestore(&timer->lock, flags);
631         return result;
632 }
633
634 /* stop/pause a slave timer */
635 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
636 {
637         unsigned long flags;
638
639         spin_lock_irqsave(&slave_active_lock, flags);
640         if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
641                 spin_unlock_irqrestore(&slave_active_lock, flags);
642                 return -EBUSY;
643         }
644         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
645         if (timeri->timer) {
646                 spin_lock(&timeri->timer->lock);
647                 list_del_init(&timeri->ack_list);
648                 list_del_init(&timeri->active_list);
649                 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
650                                   SNDRV_TIMER_EVENT_PAUSE);
651                 spin_unlock(&timeri->timer->lock);
652         }
653         spin_unlock_irqrestore(&slave_active_lock, flags);
654         return 0;
655 }
656
657 /*
658  *  start the timer instance
659  */
660 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
661 {
662         if (timeri == NULL || ticks < 1)
663                 return -EINVAL;
664         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
665                 return snd_timer_start_slave(timeri, true);
666         else
667                 return snd_timer_start1(timeri, true, ticks);
668 }
669 EXPORT_SYMBOL(snd_timer_start);
670
671 /*
672  * stop the timer instance.
673  *
674  * do not call this from the timer callback!
675  */
676 int snd_timer_stop(struct snd_timer_instance *timeri)
677 {
678         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
679                 return snd_timer_stop_slave(timeri, true);
680         else
681                 return snd_timer_stop1(timeri, true);
682 }
683 EXPORT_SYMBOL(snd_timer_stop);
684
685 /*
686  * start again..  the tick is kept.
687  */
688 int snd_timer_continue(struct snd_timer_instance *timeri)
689 {
690         /* timer can continue only after pause */
691         if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
692                 return -EINVAL;
693
694         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
695                 return snd_timer_start_slave(timeri, false);
696         else
697                 return snd_timer_start1(timeri, false, 0);
698 }
699 EXPORT_SYMBOL(snd_timer_continue);
700
701 /*
702  * pause.. remember the ticks left
703  */
704 int snd_timer_pause(struct snd_timer_instance * timeri)
705 {
706         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
707                 return snd_timer_stop_slave(timeri, false);
708         else
709                 return snd_timer_stop1(timeri, false);
710 }
711 EXPORT_SYMBOL(snd_timer_pause);
712
713 /*
714  * reschedule the timer
715  *
716  * start pending instances and check the scheduling ticks.
717  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
718  */
719 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
720 {
721         struct snd_timer_instance *ti;
722         unsigned long ticks = ~0UL;
723
724         list_for_each_entry(ti, &timer->active_list_head, active_list) {
725                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
726                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
727                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
728                         timer->running++;
729                 }
730                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
731                         if (ticks > ti->cticks)
732                                 ticks = ti->cticks;
733                 }
734         }
735         if (ticks == ~0UL) {
736                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
737                 return;
738         }
739         if (ticks > timer->hw.ticks)
740                 ticks = timer->hw.ticks;
741         if (ticks_left != ticks)
742                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
743         timer->sticks = ticks;
744 }
745
746 /* call callbacks in timer ack list */
747 static void snd_timer_process_callbacks(struct snd_timer *timer,
748                                         struct list_head *head)
749 {
750         struct snd_timer_instance *ti;
751         unsigned long resolution, ticks;
752
753         while (!list_empty(head)) {
754                 ti = list_first_entry(head, struct snd_timer_instance,
755                                       ack_list);
756
757                 /* remove from ack_list and make empty */
758                 list_del_init(&ti->ack_list);
759
760                 if (!(ti->flags & SNDRV_TIMER_IFLG_DEAD)) {
761                         ticks = ti->pticks;
762                         ti->pticks = 0;
763                         resolution = ti->resolution;
764                         ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
765                         spin_unlock(&timer->lock);
766                         if (ti->callback)
767                                 ti->callback(ti, resolution, ticks);
768                         spin_lock(&timer->lock);
769                         ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
770                 }
771         }
772 }
773
774 /* clear pending instances from ack list */
775 static void snd_timer_clear_callbacks(struct snd_timer *timer,
776                                       struct list_head *head)
777 {
778         unsigned long flags;
779
780         spin_lock_irqsave(&timer->lock, flags);
781         while (!list_empty(head))
782                 list_del_init(head->next);
783         spin_unlock_irqrestore(&timer->lock, flags);
784 }
785
786 /*
787  * timer tasklet
788  *
789  */
790 static void snd_timer_tasklet(unsigned long arg)
791 {
792         struct snd_timer *timer = (struct snd_timer *) arg;
793         unsigned long flags;
794
795         if (timer->card && timer->card->shutdown) {
796                 snd_timer_clear_callbacks(timer, &timer->sack_list_head);
797                 return;
798         }
799
800         spin_lock_irqsave(&timer->lock, flags);
801         snd_timer_process_callbacks(timer, &timer->sack_list_head);
802         spin_unlock_irqrestore(&timer->lock, flags);
803 }
804
805 /*
806  * timer interrupt
807  *
808  * ticks_left is usually equal to timer->sticks.
809  *
810  */
811 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
812 {
813         struct snd_timer_instance *ti, *ts, *tmp;
814         unsigned long resolution;
815         struct list_head *ack_list_head;
816         unsigned long flags;
817         int use_tasklet = 0;
818
819         if (timer == NULL)
820                 return;
821
822         if (timer->card && timer->card->shutdown) {
823                 snd_timer_clear_callbacks(timer, &timer->ack_list_head);
824                 return;
825         }
826
827         spin_lock_irqsave(&timer->lock, flags);
828
829         /* remember the current resolution */
830         resolution = snd_timer_hw_resolution(timer);
831
832         /* loop for all active instances
833          * Here we cannot use list_for_each_entry because the active_list of a
834          * processed instance is relinked to done_list_head before the callback
835          * is called.
836          */
837         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
838                                  active_list) {
839                 if (ti->flags & SNDRV_TIMER_IFLG_DEAD)
840                         continue;
841                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
842                         continue;
843                 ti->pticks += ticks_left;
844                 ti->resolution = resolution;
845                 if (ti->cticks < ticks_left)
846                         ti->cticks = 0;
847                 else
848                         ti->cticks -= ticks_left;
849                 if (ti->cticks) /* not expired */
850                         continue;
851                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
852                         ti->cticks = ti->ticks;
853                 } else {
854                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
855                         --timer->running;
856                         list_del_init(&ti->active_list);
857                 }
858                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
859                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
860                         ack_list_head = &timer->ack_list_head;
861                 else
862                         ack_list_head = &timer->sack_list_head;
863                 if (list_empty(&ti->ack_list))
864                         list_add_tail(&ti->ack_list, ack_list_head);
865                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
866                         ts->pticks = ti->pticks;
867                         ts->resolution = resolution;
868                         if (list_empty(&ts->ack_list))
869                                 list_add_tail(&ts->ack_list, ack_list_head);
870                 }
871         }
872         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
873                 snd_timer_reschedule(timer, timer->sticks);
874         if (timer->running) {
875                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
876                         timer->hw.stop(timer);
877                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
878                 }
879                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
880                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
881                         /* restart timer */
882                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
883                         timer->hw.start(timer);
884                 }
885         } else {
886                 timer->hw.stop(timer);
887         }
888
889         /* now process all fast callbacks */
890         snd_timer_process_callbacks(timer, &timer->ack_list_head);
891
892         /* do we have any slow callbacks? */
893         use_tasklet = !list_empty(&timer->sack_list_head);
894         spin_unlock_irqrestore(&timer->lock, flags);
895
896         if (use_tasklet)
897                 tasklet_schedule(&timer->task_queue);
898 }
899 EXPORT_SYMBOL(snd_timer_interrupt);
900
901 /*
902
903  */
904
905 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
906                   struct snd_timer **rtimer)
907 {
908         struct snd_timer *timer;
909         int err;
910         static struct snd_device_ops ops = {
911                 .dev_free = snd_timer_dev_free,
912                 .dev_register = snd_timer_dev_register,
913                 .dev_disconnect = snd_timer_dev_disconnect,
914         };
915
916         if (snd_BUG_ON(!tid))
917                 return -EINVAL;
918         if (tid->dev_class == SNDRV_TIMER_CLASS_CARD ||
919             tid->dev_class == SNDRV_TIMER_CLASS_PCM) {
920                 if (WARN_ON(!card))
921                         return -EINVAL;
922         }
923         if (rtimer)
924                 *rtimer = NULL;
925         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
926         if (!timer)
927                 return -ENOMEM;
928         timer->tmr_class = tid->dev_class;
929         timer->card = card;
930         timer->tmr_device = tid->device;
931         timer->tmr_subdevice = tid->subdevice;
932         if (id)
933                 strlcpy(timer->id, id, sizeof(timer->id));
934         timer->sticks = 1;
935         INIT_LIST_HEAD(&timer->device_list);
936         INIT_LIST_HEAD(&timer->open_list_head);
937         INIT_LIST_HEAD(&timer->active_list_head);
938         INIT_LIST_HEAD(&timer->ack_list_head);
939         INIT_LIST_HEAD(&timer->sack_list_head);
940         spin_lock_init(&timer->lock);
941         tasklet_init(&timer->task_queue, snd_timer_tasklet,
942                      (unsigned long)timer);
943         timer->max_instances = 1000; /* default limit per timer */
944         if (card != NULL) {
945                 timer->module = card->module;
946                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
947                 if (err < 0) {
948                         snd_timer_free(timer);
949                         return err;
950                 }
951         }
952         if (rtimer)
953                 *rtimer = timer;
954         return 0;
955 }
956 EXPORT_SYMBOL(snd_timer_new);
957
958 static int snd_timer_free(struct snd_timer *timer)
959 {
960         if (!timer)
961                 return 0;
962
963         mutex_lock(&register_mutex);
964         if (! list_empty(&timer->open_list_head)) {
965                 struct list_head *p, *n;
966                 struct snd_timer_instance *ti;
967                 pr_warn("ALSA: timer %p is busy?\n", timer);
968                 list_for_each_safe(p, n, &timer->open_list_head) {
969                         list_del_init(p);
970                         ti = list_entry(p, struct snd_timer_instance, open_list);
971                         ti->timer = NULL;
972                 }
973         }
974         list_del(&timer->device_list);
975         mutex_unlock(&register_mutex);
976
977         if (timer->private_free)
978                 timer->private_free(timer);
979         kfree(timer);
980         return 0;
981 }
982
983 static int snd_timer_dev_free(struct snd_device *device)
984 {
985         struct snd_timer *timer = device->device_data;
986         return snd_timer_free(timer);
987 }
988
989 static int snd_timer_dev_register(struct snd_device *dev)
990 {
991         struct snd_timer *timer = dev->device_data;
992         struct snd_timer *timer1;
993
994         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
995                 return -ENXIO;
996         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
997             !timer->hw.resolution && timer->hw.c_resolution == NULL)
998                 return -EINVAL;
999
1000         mutex_lock(&register_mutex);
1001         list_for_each_entry(timer1, &snd_timer_list, device_list) {
1002                 if (timer1->tmr_class > timer->tmr_class)
1003                         break;
1004                 if (timer1->tmr_class < timer->tmr_class)
1005                         continue;
1006                 if (timer1->card && timer->card) {
1007                         if (timer1->card->number > timer->card->number)
1008                                 break;
1009                         if (timer1->card->number < timer->card->number)
1010                                 continue;
1011                 }
1012                 if (timer1->tmr_device > timer->tmr_device)
1013                         break;
1014                 if (timer1->tmr_device < timer->tmr_device)
1015                         continue;
1016                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
1017                         break;
1018                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
1019                         continue;
1020                 /* conflicts.. */
1021                 mutex_unlock(&register_mutex);
1022                 return -EBUSY;
1023         }
1024         list_add_tail(&timer->device_list, &timer1->device_list);
1025         mutex_unlock(&register_mutex);
1026         return 0;
1027 }
1028
1029 static int snd_timer_dev_disconnect(struct snd_device *device)
1030 {
1031         struct snd_timer *timer = device->device_data;
1032         struct snd_timer_instance *ti;
1033
1034         mutex_lock(&register_mutex);
1035         list_del_init(&timer->device_list);
1036         /* wake up pending sleepers */
1037         list_for_each_entry(ti, &timer->open_list_head, open_list) {
1038                 if (ti->disconnect)
1039                         ti->disconnect(ti);
1040         }
1041         mutex_unlock(&register_mutex);
1042         return 0;
1043 }
1044
1045 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
1046 {
1047         unsigned long flags;
1048         unsigned long resolution = 0;
1049         struct snd_timer_instance *ti, *ts;
1050
1051         if (timer->card && timer->card->shutdown)
1052                 return;
1053         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
1054                 return;
1055         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
1056                        event > SNDRV_TIMER_EVENT_MRESUME))
1057                 return;
1058         spin_lock_irqsave(&timer->lock, flags);
1059         if (event == SNDRV_TIMER_EVENT_MSTART ||
1060             event == SNDRV_TIMER_EVENT_MCONTINUE ||
1061             event == SNDRV_TIMER_EVENT_MRESUME)
1062                 resolution = snd_timer_hw_resolution(timer);
1063         list_for_each_entry(ti, &timer->active_list_head, active_list) {
1064                 if (ti->ccallback)
1065                         ti->ccallback(ti, event, tstamp, resolution);
1066                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1067                         if (ts->ccallback)
1068                                 ts->ccallback(ts, event, tstamp, resolution);
1069         }
1070         spin_unlock_irqrestore(&timer->lock, flags);
1071 }
1072 EXPORT_SYMBOL(snd_timer_notify);
1073
1074 /*
1075  * exported functions for global timers
1076  */
1077 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1078 {
1079         struct snd_timer_id tid;
1080
1081         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1082         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1083         tid.card = -1;
1084         tid.device = device;
1085         tid.subdevice = 0;
1086         return snd_timer_new(NULL, id, &tid, rtimer);
1087 }
1088 EXPORT_SYMBOL(snd_timer_global_new);
1089
1090 int snd_timer_global_free(struct snd_timer *timer)
1091 {
1092         return snd_timer_free(timer);
1093 }
1094 EXPORT_SYMBOL(snd_timer_global_free);
1095
1096 int snd_timer_global_register(struct snd_timer *timer)
1097 {
1098         struct snd_device dev;
1099
1100         memset(&dev, 0, sizeof(dev));
1101         dev.device_data = timer;
1102         return snd_timer_dev_register(&dev);
1103 }
1104 EXPORT_SYMBOL(snd_timer_global_register);
1105
1106 /*
1107  *  System timer
1108  */
1109
1110 struct snd_timer_system_private {
1111         struct timer_list tlist;
1112         struct snd_timer *snd_timer;
1113         unsigned long last_expires;
1114         unsigned long last_jiffies;
1115         unsigned long correction;
1116 };
1117
1118 static void snd_timer_s_function(struct timer_list *t)
1119 {
1120         struct snd_timer_system_private *priv = from_timer(priv, t,
1121                                                                 tlist);
1122         struct snd_timer *timer = priv->snd_timer;
1123         unsigned long jiff = jiffies;
1124         if (time_after(jiff, priv->last_expires))
1125                 priv->correction += (long)jiff - (long)priv->last_expires;
1126         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1127 }
1128
1129 static int snd_timer_s_start(struct snd_timer * timer)
1130 {
1131         struct snd_timer_system_private *priv;
1132         unsigned long njiff;
1133
1134         priv = (struct snd_timer_system_private *) timer->private_data;
1135         njiff = (priv->last_jiffies = jiffies);
1136         if (priv->correction > timer->sticks - 1) {
1137                 priv->correction -= timer->sticks - 1;
1138                 njiff++;
1139         } else {
1140                 njiff += timer->sticks - priv->correction;
1141                 priv->correction = 0;
1142         }
1143         priv->last_expires = njiff;
1144         mod_timer(&priv->tlist, njiff);
1145         return 0;
1146 }
1147
1148 static int snd_timer_s_stop(struct snd_timer * timer)
1149 {
1150         struct snd_timer_system_private *priv;
1151         unsigned long jiff;
1152
1153         priv = (struct snd_timer_system_private *) timer->private_data;
1154         del_timer(&priv->tlist);
1155         jiff = jiffies;
1156         if (time_before(jiff, priv->last_expires))
1157                 timer->sticks = priv->last_expires - jiff;
1158         else
1159                 timer->sticks = 1;
1160         priv->correction = 0;
1161         return 0;
1162 }
1163
1164 static int snd_timer_s_close(struct snd_timer *timer)
1165 {
1166         struct snd_timer_system_private *priv;
1167
1168         priv = (struct snd_timer_system_private *)timer->private_data;
1169         del_timer_sync(&priv->tlist);
1170         return 0;
1171 }
1172
1173 static struct snd_timer_hardware snd_timer_system =
1174 {
1175         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1176         .resolution =   1000000000L / HZ,
1177         .ticks =        10000000L,
1178         .close =        snd_timer_s_close,
1179         .start =        snd_timer_s_start,
1180         .stop =         snd_timer_s_stop
1181 };
1182
1183 static void snd_timer_free_system(struct snd_timer *timer)
1184 {
1185         kfree(timer->private_data);
1186 }
1187
1188 static int snd_timer_register_system(void)
1189 {
1190         struct snd_timer *timer;
1191         struct snd_timer_system_private *priv;
1192         int err;
1193
1194         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1195         if (err < 0)
1196                 return err;
1197         strcpy(timer->name, "system timer");
1198         timer->hw = snd_timer_system;
1199         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1200         if (priv == NULL) {
1201                 snd_timer_free(timer);
1202                 return -ENOMEM;
1203         }
1204         priv->snd_timer = timer;
1205         timer_setup(&priv->tlist, snd_timer_s_function, 0);
1206         timer->private_data = priv;
1207         timer->private_free = snd_timer_free_system;
1208         return snd_timer_global_register(timer);
1209 }
1210
1211 #ifdef CONFIG_SND_PROC_FS
1212 /*
1213  *  Info interface
1214  */
1215
1216 static void snd_timer_proc_read(struct snd_info_entry *entry,
1217                                 struct snd_info_buffer *buffer)
1218 {
1219         struct snd_timer *timer;
1220         struct snd_timer_instance *ti;
1221
1222         mutex_lock(&register_mutex);
1223         list_for_each_entry(timer, &snd_timer_list, device_list) {
1224                 if (timer->card && timer->card->shutdown)
1225                         continue;
1226                 switch (timer->tmr_class) {
1227                 case SNDRV_TIMER_CLASS_GLOBAL:
1228                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1229                         break;
1230                 case SNDRV_TIMER_CLASS_CARD:
1231                         snd_iprintf(buffer, "C%i-%i: ",
1232                                     timer->card->number, timer->tmr_device);
1233                         break;
1234                 case SNDRV_TIMER_CLASS_PCM:
1235                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1236                                     timer->tmr_device, timer->tmr_subdevice);
1237                         break;
1238                 default:
1239                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1240                                     timer->card ? timer->card->number : -1,
1241                                     timer->tmr_device, timer->tmr_subdevice);
1242                 }
1243                 snd_iprintf(buffer, "%s :", timer->name);
1244                 if (timer->hw.resolution)
1245                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1246                                     timer->hw.resolution / 1000,
1247                                     timer->hw.resolution % 1000,
1248                                     timer->hw.ticks);
1249                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1250                         snd_iprintf(buffer, " SLAVE");
1251                 snd_iprintf(buffer, "\n");
1252                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1253                         snd_iprintf(buffer, "  Client %s : %s\n",
1254                                     ti->owner ? ti->owner : "unknown",
1255                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1256                                                  SNDRV_TIMER_IFLG_RUNNING)
1257                                     ? "running" : "stopped");
1258         }
1259         mutex_unlock(&register_mutex);
1260 }
1261
1262 static struct snd_info_entry *snd_timer_proc_entry;
1263
1264 static void __init snd_timer_proc_init(void)
1265 {
1266         struct snd_info_entry *entry;
1267
1268         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1269         if (entry != NULL) {
1270                 entry->c.text.read = snd_timer_proc_read;
1271                 if (snd_info_register(entry) < 0) {
1272                         snd_info_free_entry(entry);
1273                         entry = NULL;
1274                 }
1275         }
1276         snd_timer_proc_entry = entry;
1277 }
1278
1279 static void __exit snd_timer_proc_done(void)
1280 {
1281         snd_info_free_entry(snd_timer_proc_entry);
1282 }
1283 #else /* !CONFIG_SND_PROC_FS */
1284 #define snd_timer_proc_init()
1285 #define snd_timer_proc_done()
1286 #endif
1287
1288 /*
1289  *  USER SPACE interface
1290  */
1291
1292 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1293                                      unsigned long resolution,
1294                                      unsigned long ticks)
1295 {
1296         struct snd_timer_user *tu = timeri->callback_data;
1297         struct snd_timer_read *r;
1298         int prev;
1299
1300         spin_lock(&tu->qlock);
1301         if (tu->qused > 0) {
1302                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1303                 r = &tu->queue[prev];
1304                 if (r->resolution == resolution) {
1305                         r->ticks += ticks;
1306                         goto __wake;
1307                 }
1308         }
1309         if (tu->qused >= tu->queue_size) {
1310                 tu->overrun++;
1311         } else {
1312                 r = &tu->queue[tu->qtail++];
1313                 tu->qtail %= tu->queue_size;
1314                 r->resolution = resolution;
1315                 r->ticks = ticks;
1316                 tu->qused++;
1317         }
1318       __wake:
1319         spin_unlock(&tu->qlock);
1320         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1321         wake_up(&tu->qchange_sleep);
1322 }
1323
1324 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1325                                             struct snd_timer_tread *tread)
1326 {
1327         if (tu->qused >= tu->queue_size) {
1328                 tu->overrun++;
1329         } else {
1330                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1331                 tu->qtail %= tu->queue_size;
1332                 tu->qused++;
1333         }
1334 }
1335
1336 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1337                                      int event,
1338                                      struct timespec *tstamp,
1339                                      unsigned long resolution)
1340 {
1341         struct snd_timer_user *tu = timeri->callback_data;
1342         struct snd_timer_tread r1;
1343         unsigned long flags;
1344
1345         if (event >= SNDRV_TIMER_EVENT_START &&
1346             event <= SNDRV_TIMER_EVENT_PAUSE)
1347                 tu->tstamp = *tstamp;
1348         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1349                 return;
1350         memset(&r1, 0, sizeof(r1));
1351         r1.event = event;
1352         r1.tstamp = *tstamp;
1353         r1.val = resolution;
1354         spin_lock_irqsave(&tu->qlock, flags);
1355         snd_timer_user_append_to_tqueue(tu, &r1);
1356         spin_unlock_irqrestore(&tu->qlock, flags);
1357         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1358         wake_up(&tu->qchange_sleep);
1359 }
1360
1361 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1362 {
1363         struct snd_timer_user *tu = timeri->callback_data;
1364
1365         tu->disconnected = true;
1366         wake_up(&tu->qchange_sleep);
1367 }
1368
1369 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1370                                       unsigned long resolution,
1371                                       unsigned long ticks)
1372 {
1373         struct snd_timer_user *tu = timeri->callback_data;
1374         struct snd_timer_tread *r, r1;
1375         struct timespec tstamp;
1376         int prev, append = 0;
1377
1378         memset(&r1, 0, sizeof(r1));
1379         memset(&tstamp, 0, sizeof(tstamp));
1380         spin_lock(&tu->qlock);
1381         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1382                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1383                 spin_unlock(&tu->qlock);
1384                 return;
1385         }
1386         if (tu->last_resolution != resolution || ticks > 0) {
1387                 if (timer_tstamp_monotonic)
1388                         ktime_get_ts(&tstamp);
1389                 else
1390                         getnstimeofday(&tstamp);
1391         }
1392         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1393             tu->last_resolution != resolution) {
1394                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1395                 r1.tstamp = tstamp;
1396                 r1.val = resolution;
1397                 snd_timer_user_append_to_tqueue(tu, &r1);
1398                 tu->last_resolution = resolution;
1399                 append++;
1400         }
1401         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1402                 goto __wake;
1403         if (ticks == 0)
1404                 goto __wake;
1405         if (tu->qused > 0) {
1406                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1407                 r = &tu->tqueue[prev];
1408                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1409                         r->tstamp = tstamp;
1410                         r->val += ticks;
1411                         append++;
1412                         goto __wake;
1413                 }
1414         }
1415         r1.event = SNDRV_TIMER_EVENT_TICK;
1416         r1.tstamp = tstamp;
1417         r1.val = ticks;
1418         snd_timer_user_append_to_tqueue(tu, &r1);
1419         append++;
1420       __wake:
1421         spin_unlock(&tu->qlock);
1422         if (append == 0)
1423                 return;
1424         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1425         wake_up(&tu->qchange_sleep);
1426 }
1427
1428 static int realloc_user_queue(struct snd_timer_user *tu, int size)
1429 {
1430         struct snd_timer_read *queue = NULL;
1431         struct snd_timer_tread *tqueue = NULL;
1432
1433         if (tu->tread) {
1434                 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1435                 if (!tqueue)
1436                         return -ENOMEM;
1437         } else {
1438                 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1439                 if (!queue)
1440                         return -ENOMEM;
1441         }
1442
1443         spin_lock_irq(&tu->qlock);
1444         kfree(tu->queue);
1445         kfree(tu->tqueue);
1446         tu->queue_size = size;
1447         tu->queue = queue;
1448         tu->tqueue = tqueue;
1449         tu->qhead = tu->qtail = tu->qused = 0;
1450         spin_unlock_irq(&tu->qlock);
1451
1452         return 0;
1453 }
1454
1455 static int snd_timer_user_open(struct inode *inode, struct file *file)
1456 {
1457         struct snd_timer_user *tu;
1458         int err;
1459
1460         err = stream_open(inode, file);
1461         if (err < 0)
1462                 return err;
1463
1464         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1465         if (tu == NULL)
1466                 return -ENOMEM;
1467         spin_lock_init(&tu->qlock);
1468         init_waitqueue_head(&tu->qchange_sleep);
1469         mutex_init(&tu->ioctl_lock);
1470         tu->ticks = 1;
1471         if (realloc_user_queue(tu, 128) < 0) {
1472                 kfree(tu);
1473                 return -ENOMEM;
1474         }
1475         file->private_data = tu;
1476         return 0;
1477 }
1478
1479 static int snd_timer_user_release(struct inode *inode, struct file *file)
1480 {
1481         struct snd_timer_user *tu;
1482
1483         if (file->private_data) {
1484                 tu = file->private_data;
1485                 file->private_data = NULL;
1486                 mutex_lock(&tu->ioctl_lock);
1487                 if (tu->timeri)
1488                         snd_timer_close(tu->timeri);
1489                 mutex_unlock(&tu->ioctl_lock);
1490                 kfree(tu->queue);
1491                 kfree(tu->tqueue);
1492                 kfree(tu);
1493         }
1494         return 0;
1495 }
1496
1497 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1498 {
1499         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1500         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1501         id->card = -1;
1502         id->device = -1;
1503         id->subdevice = -1;
1504 }
1505
1506 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1507 {
1508         id->dev_class = timer->tmr_class;
1509         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1510         id->card = timer->card ? timer->card->number : -1;
1511         id->device = timer->tmr_device;
1512         id->subdevice = timer->tmr_subdevice;
1513 }
1514
1515 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1516 {
1517         struct snd_timer_id id;
1518         struct snd_timer *timer;
1519         struct list_head *p;
1520
1521         if (copy_from_user(&id, _tid, sizeof(id)))
1522                 return -EFAULT;
1523         mutex_lock(&register_mutex);
1524         if (id.dev_class < 0) {         /* first item */
1525                 if (list_empty(&snd_timer_list))
1526                         snd_timer_user_zero_id(&id);
1527                 else {
1528                         timer = list_entry(snd_timer_list.next,
1529                                            struct snd_timer, device_list);
1530                         snd_timer_user_copy_id(&id, timer);
1531                 }
1532         } else {
1533                 switch (id.dev_class) {
1534                 case SNDRV_TIMER_CLASS_GLOBAL:
1535                         id.device = id.device < 0 ? 0 : id.device + 1;
1536                         list_for_each(p, &snd_timer_list) {
1537                                 timer = list_entry(p, struct snd_timer, device_list);
1538                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1539                                         snd_timer_user_copy_id(&id, timer);
1540                                         break;
1541                                 }
1542                                 if (timer->tmr_device >= id.device) {
1543                                         snd_timer_user_copy_id(&id, timer);
1544                                         break;
1545                                 }
1546                         }
1547                         if (p == &snd_timer_list)
1548                                 snd_timer_user_zero_id(&id);
1549                         break;
1550                 case SNDRV_TIMER_CLASS_CARD:
1551                 case SNDRV_TIMER_CLASS_PCM:
1552                         if (id.card < 0) {
1553                                 id.card = 0;
1554                         } else {
1555                                 if (id.device < 0) {
1556                                         id.device = 0;
1557                                 } else {
1558                                         if (id.subdevice < 0)
1559                                                 id.subdevice = 0;
1560                                         else if (id.subdevice < INT_MAX)
1561                                                 id.subdevice++;
1562                                 }
1563                         }
1564                         list_for_each(p, &snd_timer_list) {
1565                                 timer = list_entry(p, struct snd_timer, device_list);
1566                                 if (timer->tmr_class > id.dev_class) {
1567                                         snd_timer_user_copy_id(&id, timer);
1568                                         break;
1569                                 }
1570                                 if (timer->tmr_class < id.dev_class)
1571                                         continue;
1572                                 if (timer->card->number > id.card) {
1573                                         snd_timer_user_copy_id(&id, timer);
1574                                         break;
1575                                 }
1576                                 if (timer->card->number < id.card)
1577                                         continue;
1578                                 if (timer->tmr_device > id.device) {
1579                                         snd_timer_user_copy_id(&id, timer);
1580                                         break;
1581                                 }
1582                                 if (timer->tmr_device < id.device)
1583                                         continue;
1584                                 if (timer->tmr_subdevice > id.subdevice) {
1585                                         snd_timer_user_copy_id(&id, timer);
1586                                         break;
1587                                 }
1588                                 if (timer->tmr_subdevice < id.subdevice)
1589                                         continue;
1590                                 snd_timer_user_copy_id(&id, timer);
1591                                 break;
1592                         }
1593                         if (p == &snd_timer_list)
1594                                 snd_timer_user_zero_id(&id);
1595                         break;
1596                 default:
1597                         snd_timer_user_zero_id(&id);
1598                 }
1599         }
1600         mutex_unlock(&register_mutex);
1601         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1602                 return -EFAULT;
1603         return 0;
1604 }
1605
1606 static int snd_timer_user_ginfo(struct file *file,
1607                                 struct snd_timer_ginfo __user *_ginfo)
1608 {
1609         struct snd_timer_ginfo *ginfo;
1610         struct snd_timer_id tid;
1611         struct snd_timer *t;
1612         struct list_head *p;
1613         int err = 0;
1614
1615         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1616         if (IS_ERR(ginfo))
1617                 return PTR_ERR(ginfo);
1618
1619         tid = ginfo->tid;
1620         memset(ginfo, 0, sizeof(*ginfo));
1621         ginfo->tid = tid;
1622         mutex_lock(&register_mutex);
1623         t = snd_timer_find(&tid);
1624         if (t != NULL) {
1625                 ginfo->card = t->card ? t->card->number : -1;
1626                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1627                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1628                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1629                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1630                 ginfo->resolution = t->hw.resolution;
1631                 if (t->hw.resolution_min > 0) {
1632                         ginfo->resolution_min = t->hw.resolution_min;
1633                         ginfo->resolution_max = t->hw.resolution_max;
1634                 }
1635                 list_for_each(p, &t->open_list_head) {
1636                         ginfo->clients++;
1637                 }
1638         } else {
1639                 err = -ENODEV;
1640         }
1641         mutex_unlock(&register_mutex);
1642         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1643                 err = -EFAULT;
1644         kfree(ginfo);
1645         return err;
1646 }
1647
1648 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1649 {
1650         struct snd_timer *t;
1651         int err;
1652
1653         mutex_lock(&register_mutex);
1654         t = snd_timer_find(&gparams->tid);
1655         if (!t) {
1656                 err = -ENODEV;
1657                 goto _error;
1658         }
1659         if (!list_empty(&t->open_list_head)) {
1660                 err = -EBUSY;
1661                 goto _error;
1662         }
1663         if (!t->hw.set_period) {
1664                 err = -ENOSYS;
1665                 goto _error;
1666         }
1667         err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1668 _error:
1669         mutex_unlock(&register_mutex);
1670         return err;
1671 }
1672
1673 static int snd_timer_user_gparams(struct file *file,
1674                                   struct snd_timer_gparams __user *_gparams)
1675 {
1676         struct snd_timer_gparams gparams;
1677
1678         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1679                 return -EFAULT;
1680         return timer_set_gparams(&gparams);
1681 }
1682
1683 static int snd_timer_user_gstatus(struct file *file,
1684                                   struct snd_timer_gstatus __user *_gstatus)
1685 {
1686         struct snd_timer_gstatus gstatus;
1687         struct snd_timer_id tid;
1688         struct snd_timer *t;
1689         int err = 0;
1690
1691         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1692                 return -EFAULT;
1693         tid = gstatus.tid;
1694         memset(&gstatus, 0, sizeof(gstatus));
1695         gstatus.tid = tid;
1696         mutex_lock(&register_mutex);
1697         t = snd_timer_find(&tid);
1698         if (t != NULL) {
1699                 spin_lock_irq(&t->lock);
1700                 gstatus.resolution = snd_timer_hw_resolution(t);
1701                 if (t->hw.precise_resolution) {
1702                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1703                                                  &gstatus.resolution_den);
1704                 } else {
1705                         gstatus.resolution_num = gstatus.resolution;
1706                         gstatus.resolution_den = 1000000000uL;
1707                 }
1708                 spin_unlock_irq(&t->lock);
1709         } else {
1710                 err = -ENODEV;
1711         }
1712         mutex_unlock(&register_mutex);
1713         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1714                 err = -EFAULT;
1715         return err;
1716 }
1717
1718 static int snd_timer_user_tselect(struct file *file,
1719                                   struct snd_timer_select __user *_tselect)
1720 {
1721         struct snd_timer_user *tu;
1722         struct snd_timer_select tselect;
1723         char str[32];
1724         int err = 0;
1725
1726         tu = file->private_data;
1727         if (tu->timeri) {
1728                 snd_timer_close(tu->timeri);
1729                 tu->timeri = NULL;
1730         }
1731         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1732                 err = -EFAULT;
1733                 goto __err;
1734         }
1735         sprintf(str, "application %i", current->pid);
1736         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1737                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1738         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1739         if (err < 0)
1740                 goto __err;
1741
1742         tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1743         tu->timeri->callback = tu->tread
1744                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1745         tu->timeri->ccallback = snd_timer_user_ccallback;
1746         tu->timeri->callback_data = (void *)tu;
1747         tu->timeri->disconnect = snd_timer_user_disconnect;
1748
1749       __err:
1750         return err;
1751 }
1752
1753 static int snd_timer_user_info(struct file *file,
1754                                struct snd_timer_info __user *_info)
1755 {
1756         struct snd_timer_user *tu;
1757         struct snd_timer_info *info;
1758         struct snd_timer *t;
1759         int err = 0;
1760
1761         tu = file->private_data;
1762         if (!tu->timeri)
1763                 return -EBADFD;
1764         t = tu->timeri->timer;
1765         if (!t)
1766                 return -EBADFD;
1767
1768         info = kzalloc(sizeof(*info), GFP_KERNEL);
1769         if (! info)
1770                 return -ENOMEM;
1771         info->card = t->card ? t->card->number : -1;
1772         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1773                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1774         strlcpy(info->id, t->id, sizeof(info->id));
1775         strlcpy(info->name, t->name, sizeof(info->name));
1776         info->resolution = t->hw.resolution;
1777         if (copy_to_user(_info, info, sizeof(*_info)))
1778                 err = -EFAULT;
1779         kfree(info);
1780         return err;
1781 }
1782
1783 static int snd_timer_user_params(struct file *file,
1784                                  struct snd_timer_params __user *_params)
1785 {
1786         struct snd_timer_user *tu;
1787         struct snd_timer_params params;
1788         struct snd_timer *t;
1789         int err;
1790
1791         tu = file->private_data;
1792         if (!tu->timeri)
1793                 return -EBADFD;
1794         t = tu->timeri->timer;
1795         if (!t)
1796                 return -EBADFD;
1797         if (copy_from_user(&params, _params, sizeof(params)))
1798                 return -EFAULT;
1799         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1800                 u64 resolution;
1801
1802                 if (params.ticks < 1) {
1803                         err = -EINVAL;
1804                         goto _end;
1805                 }
1806
1807                 /* Don't allow resolution less than 1ms */
1808                 resolution = snd_timer_resolution(tu->timeri);
1809                 resolution *= params.ticks;
1810                 if (resolution < 1000000) {
1811                         err = -EINVAL;
1812                         goto _end;
1813                 }
1814         }
1815         if (params.queue_size > 0 &&
1816             (params.queue_size < 32 || params.queue_size > 1024)) {
1817                 err = -EINVAL;
1818                 goto _end;
1819         }
1820         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1821                               (1<<SNDRV_TIMER_EVENT_TICK)|
1822                               (1<<SNDRV_TIMER_EVENT_START)|
1823                               (1<<SNDRV_TIMER_EVENT_STOP)|
1824                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1825                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1826                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1827                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1828                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1829                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1830                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1831                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1832                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1833                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1834                 err = -EINVAL;
1835                 goto _end;
1836         }
1837         snd_timer_stop(tu->timeri);
1838         spin_lock_irq(&t->lock);
1839         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1840                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1841                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1842         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1843                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1844         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1845                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1846         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1847                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1848         spin_unlock_irq(&t->lock);
1849         if (params.queue_size > 0 &&
1850             (unsigned int)tu->queue_size != params.queue_size) {
1851                 err = realloc_user_queue(tu, params.queue_size);
1852                 if (err < 0)
1853                         goto _end;
1854         }
1855         spin_lock_irq(&tu->qlock);
1856         tu->qhead = tu->qtail = tu->qused = 0;
1857         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1858                 if (tu->tread) {
1859                         struct snd_timer_tread tread;
1860                         memset(&tread, 0, sizeof(tread));
1861                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1862                         tread.tstamp.tv_sec = 0;
1863                         tread.tstamp.tv_nsec = 0;
1864                         tread.val = 0;
1865                         snd_timer_user_append_to_tqueue(tu, &tread);
1866                 } else {
1867                         struct snd_timer_read *r = &tu->queue[0];
1868                         r->resolution = 0;
1869                         r->ticks = 0;
1870                         tu->qused++;
1871                         tu->qtail++;
1872                 }
1873         }
1874         tu->filter = params.filter;
1875         tu->ticks = params.ticks;
1876         spin_unlock_irq(&tu->qlock);
1877         err = 0;
1878  _end:
1879         if (copy_to_user(_params, &params, sizeof(params)))
1880                 return -EFAULT;
1881         return err;
1882 }
1883
1884 static int snd_timer_user_status(struct file *file,
1885                                  struct snd_timer_status __user *_status)
1886 {
1887         struct snd_timer_user *tu;
1888         struct snd_timer_status status;
1889
1890         tu = file->private_data;
1891         if (!tu->timeri)
1892                 return -EBADFD;
1893         memset(&status, 0, sizeof(status));
1894         status.tstamp = tu->tstamp;
1895         status.resolution = snd_timer_resolution(tu->timeri);
1896         status.lost = tu->timeri->lost;
1897         status.overrun = tu->overrun;
1898         spin_lock_irq(&tu->qlock);
1899         status.queue = tu->qused;
1900         spin_unlock_irq(&tu->qlock);
1901         if (copy_to_user(_status, &status, sizeof(status)))
1902                 return -EFAULT;
1903         return 0;
1904 }
1905
1906 static int snd_timer_user_start(struct file *file)
1907 {
1908         int err;
1909         struct snd_timer_user *tu;
1910
1911         tu = file->private_data;
1912         if (!tu->timeri)
1913                 return -EBADFD;
1914         snd_timer_stop(tu->timeri);
1915         tu->timeri->lost = 0;
1916         tu->last_resolution = 0;
1917         err = snd_timer_start(tu->timeri, tu->ticks);
1918         if (err < 0)
1919                 return err;
1920         return 0;
1921 }
1922
1923 static int snd_timer_user_stop(struct file *file)
1924 {
1925         int err;
1926         struct snd_timer_user *tu;
1927
1928         tu = file->private_data;
1929         if (!tu->timeri)
1930                 return -EBADFD;
1931         err = snd_timer_stop(tu->timeri);
1932         if (err < 0)
1933                 return err;
1934         return 0;
1935 }
1936
1937 static int snd_timer_user_continue(struct file *file)
1938 {
1939         int err;
1940         struct snd_timer_user *tu;
1941
1942         tu = file->private_data;
1943         if (!tu->timeri)
1944                 return -EBADFD;
1945         /* start timer instead of continue if it's not used before */
1946         if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1947                 return snd_timer_user_start(file);
1948         tu->timeri->lost = 0;
1949         err = snd_timer_continue(tu->timeri);
1950         if (err < 0)
1951                 return err;
1952         return 0;
1953 }
1954
1955 static int snd_timer_user_pause(struct file *file)
1956 {
1957         int err;
1958         struct snd_timer_user *tu;
1959
1960         tu = file->private_data;
1961         if (!tu->timeri)
1962                 return -EBADFD;
1963         err = snd_timer_pause(tu->timeri);
1964         if (err < 0)
1965                 return err;
1966         return 0;
1967 }
1968
1969 enum {
1970         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1971         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1972         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1973         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1974 };
1975
1976 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1977                                  unsigned long arg)
1978 {
1979         struct snd_timer_user *tu;
1980         void __user *argp = (void __user *)arg;
1981         int __user *p = argp;
1982
1983         tu = file->private_data;
1984         switch (cmd) {
1985         case SNDRV_TIMER_IOCTL_PVERSION:
1986                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1987         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1988                 return snd_timer_user_next_device(argp);
1989         case SNDRV_TIMER_IOCTL_TREAD:
1990         {
1991                 int xarg, old_tread;
1992
1993                 if (tu->timeri) /* too late */
1994                         return -EBUSY;
1995                 if (get_user(xarg, p))
1996                         return -EFAULT;
1997                 old_tread = tu->tread;
1998                 tu->tread = xarg ? 1 : 0;
1999                 if (tu->tread != old_tread &&
2000                     realloc_user_queue(tu, tu->queue_size) < 0) {
2001                         tu->tread = old_tread;
2002                         return -ENOMEM;
2003                 }
2004                 return 0;
2005         }
2006         case SNDRV_TIMER_IOCTL_GINFO:
2007                 return snd_timer_user_ginfo(file, argp);
2008         case SNDRV_TIMER_IOCTL_GPARAMS:
2009                 return snd_timer_user_gparams(file, argp);
2010         case SNDRV_TIMER_IOCTL_GSTATUS:
2011                 return snd_timer_user_gstatus(file, argp);
2012         case SNDRV_TIMER_IOCTL_SELECT:
2013                 return snd_timer_user_tselect(file, argp);
2014         case SNDRV_TIMER_IOCTL_INFO:
2015                 return snd_timer_user_info(file, argp);
2016         case SNDRV_TIMER_IOCTL_PARAMS:
2017                 return snd_timer_user_params(file, argp);
2018         case SNDRV_TIMER_IOCTL_STATUS:
2019                 return snd_timer_user_status(file, argp);
2020         case SNDRV_TIMER_IOCTL_START:
2021         case SNDRV_TIMER_IOCTL_START_OLD:
2022                 return snd_timer_user_start(file);
2023         case SNDRV_TIMER_IOCTL_STOP:
2024         case SNDRV_TIMER_IOCTL_STOP_OLD:
2025                 return snd_timer_user_stop(file);
2026         case SNDRV_TIMER_IOCTL_CONTINUE:
2027         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
2028                 return snd_timer_user_continue(file);
2029         case SNDRV_TIMER_IOCTL_PAUSE:
2030         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
2031                 return snd_timer_user_pause(file);
2032         }
2033         return -ENOTTY;
2034 }
2035
2036 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
2037                                  unsigned long arg)
2038 {
2039         struct snd_timer_user *tu = file->private_data;
2040         long ret;
2041
2042         mutex_lock(&tu->ioctl_lock);
2043         ret = __snd_timer_user_ioctl(file, cmd, arg);
2044         mutex_unlock(&tu->ioctl_lock);
2045         return ret;
2046 }
2047
2048 static int snd_timer_user_fasync(int fd, struct file * file, int on)
2049 {
2050         struct snd_timer_user *tu;
2051
2052         tu = file->private_data;
2053         return fasync_helper(fd, file, on, &tu->fasync);
2054 }
2055
2056 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
2057                                    size_t count, loff_t *offset)
2058 {
2059         struct snd_timer_user *tu;
2060         long result = 0, unit;
2061         int qhead;
2062         int err = 0;
2063
2064         tu = file->private_data;
2065         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
2066         mutex_lock(&tu->ioctl_lock);
2067         spin_lock_irq(&tu->qlock);
2068         while ((long)count - result >= unit) {
2069                 while (!tu->qused) {
2070                         wait_queue_entry_t wait;
2071
2072                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
2073                                 err = -EAGAIN;
2074                                 goto _error;
2075                         }
2076
2077                         set_current_state(TASK_INTERRUPTIBLE);
2078                         init_waitqueue_entry(&wait, current);
2079                         add_wait_queue(&tu->qchange_sleep, &wait);
2080
2081                         spin_unlock_irq(&tu->qlock);
2082                         mutex_unlock(&tu->ioctl_lock);
2083                         schedule();
2084                         mutex_lock(&tu->ioctl_lock);
2085                         spin_lock_irq(&tu->qlock);
2086
2087                         remove_wait_queue(&tu->qchange_sleep, &wait);
2088
2089                         if (tu->disconnected) {
2090                                 err = -ENODEV;
2091                                 goto _error;
2092                         }
2093                         if (signal_pending(current)) {
2094                                 err = -ERESTARTSYS;
2095                                 goto _error;
2096                         }
2097                 }
2098
2099                 qhead = tu->qhead++;
2100                 tu->qhead %= tu->queue_size;
2101                 tu->qused--;
2102                 spin_unlock_irq(&tu->qlock);
2103
2104                 if (tu->tread) {
2105                         if (copy_to_user(buffer, &tu->tqueue[qhead],
2106                                          sizeof(struct snd_timer_tread)))
2107                                 err = -EFAULT;
2108                 } else {
2109                         if (copy_to_user(buffer, &tu->queue[qhead],
2110                                          sizeof(struct snd_timer_read)))
2111                                 err = -EFAULT;
2112                 }
2113
2114                 spin_lock_irq(&tu->qlock);
2115                 if (err < 0)
2116                         goto _error;
2117                 result += unit;
2118                 buffer += unit;
2119         }
2120  _error:
2121         spin_unlock_irq(&tu->qlock);
2122         mutex_unlock(&tu->ioctl_lock);
2123         return result > 0 ? result : err;
2124 }
2125
2126 static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait)
2127 {
2128         __poll_t mask;
2129         struct snd_timer_user *tu;
2130
2131         tu = file->private_data;
2132
2133         poll_wait(file, &tu->qchange_sleep, wait);
2134
2135         mask = 0;
2136         spin_lock_irq(&tu->qlock);
2137         if (tu->qused)
2138                 mask |= EPOLLIN | EPOLLRDNORM;
2139         if (tu->disconnected)
2140                 mask |= EPOLLERR;
2141         spin_unlock_irq(&tu->qlock);
2142
2143         return mask;
2144 }
2145
2146 #ifdef CONFIG_COMPAT
2147 #include "timer_compat.c"
2148 #else
2149 #define snd_timer_user_ioctl_compat     NULL
2150 #endif
2151
2152 static const struct file_operations snd_timer_f_ops =
2153 {
2154         .owner =        THIS_MODULE,
2155         .read =         snd_timer_user_read,
2156         .open =         snd_timer_user_open,
2157         .release =      snd_timer_user_release,
2158         .llseek =       no_llseek,
2159         .poll =         snd_timer_user_poll,
2160         .unlocked_ioctl =       snd_timer_user_ioctl,
2161         .compat_ioctl = snd_timer_user_ioctl_compat,
2162         .fasync =       snd_timer_user_fasync,
2163 };
2164
2165 /* unregister the system timer */
2166 static void snd_timer_free_all(void)
2167 {
2168         struct snd_timer *timer, *n;
2169
2170         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2171                 snd_timer_free(timer);
2172 }
2173
2174 static struct device timer_dev;
2175
2176 /*
2177  *  ENTRY functions
2178  */
2179
2180 static int __init alsa_timer_init(void)
2181 {
2182         int err;
2183
2184         snd_device_initialize(&timer_dev, NULL);
2185         dev_set_name(&timer_dev, "timer");
2186
2187 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2188         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2189                               "system timer");
2190 #endif
2191
2192         err = snd_timer_register_system();
2193         if (err < 0) {
2194                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2195                 goto put_timer;
2196         }
2197
2198         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2199                                   &snd_timer_f_ops, NULL, &timer_dev);
2200         if (err < 0) {
2201                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2202                 snd_timer_free_all();
2203                 goto put_timer;
2204         }
2205
2206         snd_timer_proc_init();
2207         return 0;
2208
2209 put_timer:
2210         put_device(&timer_dev);
2211         return err;
2212 }
2213
2214 static void __exit alsa_timer_exit(void)
2215 {
2216         snd_unregister_device(&timer_dev);
2217         snd_timer_free_all();
2218         put_device(&timer_dev);
2219         snd_timer_proc_done();
2220 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2221         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2222 #endif
2223 }
2224
2225 module_init(alsa_timer_init)
2226 module_exit(alsa_timer_exit)