[ALSA] Changed Jaroslav Kysela's e-mail from perex@suse.cz to perex@perex.cz
[linux-2.6.git] / sound / core / timer.c
1 /*
2  *  Timers abstract layer
3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4  *
5  *
6  *   This program is free software; you can redistribute it and/or modify
7  *   it under the terms of the GNU General Public License as published by
8  *   the Free Software Foundation; either version 2 of the License, or
9  *   (at your option) any later version.
10  *
11  *   This program is distributed in the hope that it will be useful,
12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *   GNU General Public License for more details.
15  *
16  *   You should have received a copy of the GNU General Public License
17  *   along with this program; if not, write to the Free Software
18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19  *
20  */
21
22 #include <sound/driver.h>
23 #include <linux/delay.h>
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/mutex.h>
28 #include <linux/moduleparam.h>
29 #include <linux/string.h>
30 #include <sound/core.h>
31 #include <sound/timer.h>
32 #include <sound/control.h>
33 #include <sound/info.h>
34 #include <sound/minors.h>
35 #include <sound/initval.h>
36 #include <linux/kmod.h>
37
38 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
39 #define DEFAULT_TIMER_LIMIT 3
40 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
41 #define DEFAULT_TIMER_LIMIT 2
42 #else
43 #define DEFAULT_TIMER_LIMIT 1
44 #endif
45
46 static int timer_limit = DEFAULT_TIMER_LIMIT;
47 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
48 MODULE_DESCRIPTION("ALSA timer interface");
49 MODULE_LICENSE("GPL");
50 module_param(timer_limit, int, 0444);
51 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
52
53 struct snd_timer_user {
54         struct snd_timer_instance *timeri;
55         int tread;              /* enhanced read with timestamps and events */
56         unsigned long ticks;
57         unsigned long overrun;
58         int qhead;
59         int qtail;
60         int qused;
61         int queue_size;
62         struct snd_timer_read *queue;
63         struct snd_timer_tread *tqueue;
64         spinlock_t qlock;
65         unsigned long last_resolution;
66         unsigned int filter;
67         struct timespec tstamp;         /* trigger tstamp */
68         wait_queue_head_t qchange_sleep;
69         struct fasync_struct *fasync;
70         struct mutex tread_sem;
71 };
72
73 /* list of timers */
74 static LIST_HEAD(snd_timer_list);
75
76 /* list of slave instances */
77 static LIST_HEAD(snd_timer_slave_list);
78
79 /* lock for slave active lists */
80 static DEFINE_SPINLOCK(slave_active_lock);
81
82 static DEFINE_MUTEX(register_mutex);
83
84 static int snd_timer_free(struct snd_timer *timer);
85 static int snd_timer_dev_free(struct snd_device *device);
86 static int snd_timer_dev_register(struct snd_device *device);
87 static int snd_timer_dev_disconnect(struct snd_device *device);
88
89 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
90
91 /*
92  * create a timer instance with the given owner string.
93  * when timer is not NULL, increments the module counter
94  */
95 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
96                                                          struct snd_timer *timer)
97 {
98         struct snd_timer_instance *timeri;
99         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
100         if (timeri == NULL)
101                 return NULL;
102         timeri->owner = kstrdup(owner, GFP_KERNEL);
103         if (! timeri->owner) {
104                 kfree(timeri);
105                 return NULL;
106         }
107         INIT_LIST_HEAD(&timeri->open_list);
108         INIT_LIST_HEAD(&timeri->active_list);
109         INIT_LIST_HEAD(&timeri->ack_list);
110         INIT_LIST_HEAD(&timeri->slave_list_head);
111         INIT_LIST_HEAD(&timeri->slave_active_head);
112
113         timeri->timer = timer;
114         if (timer && !try_module_get(timer->module)) {
115                 kfree(timeri->owner);
116                 kfree(timeri);
117                 return NULL;
118         }
119
120         return timeri;
121 }
122
123 /*
124  * find a timer instance from the given timer id
125  */
126 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
127 {
128         struct snd_timer *timer = NULL;
129
130         list_for_each_entry(timer, &snd_timer_list, device_list) {
131                 if (timer->tmr_class != tid->dev_class)
132                         continue;
133                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
134                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
135                     (timer->card == NULL ||
136                      timer->card->number != tid->card))
137                         continue;
138                 if (timer->tmr_device != tid->device)
139                         continue;
140                 if (timer->tmr_subdevice != tid->subdevice)
141                         continue;
142                 return timer;
143         }
144         return NULL;
145 }
146
147 #ifdef CONFIG_KMOD
148
149 static void snd_timer_request(struct snd_timer_id *tid)
150 {
151         if (! current->fs->root)
152                 return;
153         switch (tid->dev_class) {
154         case SNDRV_TIMER_CLASS_GLOBAL:
155                 if (tid->device < timer_limit)
156                         request_module("snd-timer-%i", tid->device);
157                 break;
158         case SNDRV_TIMER_CLASS_CARD:
159         case SNDRV_TIMER_CLASS_PCM:
160                 if (tid->card < snd_ecards_limit)
161                         request_module("snd-card-%i", tid->card);
162                 break;
163         default:
164                 break;
165         }
166 }
167
168 #endif
169
170 /*
171  * look for a master instance matching with the slave id of the given slave.
172  * when found, relink the open_link of the slave.
173  *
174  * call this with register_mutex down.
175  */
176 static void snd_timer_check_slave(struct snd_timer_instance *slave)
177 {
178         struct snd_timer *timer;
179         struct snd_timer_instance *master;
180
181         /* FIXME: it's really dumb to look up all entries.. */
182         list_for_each_entry(timer, &snd_timer_list, device_list) {
183                 list_for_each_entry(master, &timer->open_list_head, open_list) {
184                         if (slave->slave_class == master->slave_class &&
185                             slave->slave_id == master->slave_id) {
186                                 list_del(&slave->open_list);
187                                 list_add_tail(&slave->open_list,
188                                               &master->slave_list_head);
189                                 spin_lock_irq(&slave_active_lock);
190                                 slave->master = master;
191                                 slave->timer = master->timer;
192                                 spin_unlock_irq(&slave_active_lock);
193                                 return;
194                         }
195                 }
196         }
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 void 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                         list_move_tail(&slave->open_list, &master->slave_list_head);
214                         spin_lock_irq(&slave_active_lock);
215                         slave->master = master;
216                         slave->timer = master->timer;
217                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
218                                 list_add_tail(&slave->active_list,
219                                               &master->slave_active_head);
220                         spin_unlock_irq(&slave_active_lock);
221                 }
222         }
223 }
224
225 /*
226  * open a timer instance
227  * when opening a master, the slave id must be here given.
228  */
229 int snd_timer_open(struct snd_timer_instance **ti,
230                    char *owner, struct snd_timer_id *tid,
231                    unsigned int slave_id)
232 {
233         struct snd_timer *timer;
234         struct snd_timer_instance *timeri = NULL;
235
236         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
237                 /* open a slave instance */
238                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
239                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
240                         snd_printd("invalid slave class %i\n", tid->dev_sclass);
241                         return -EINVAL;
242                 }
243                 mutex_lock(&register_mutex);
244                 timeri = snd_timer_instance_new(owner, NULL);
245                 if (!timeri) {
246                         mutex_unlock(&register_mutex);
247                         return -ENOMEM;
248                 }
249                 timeri->slave_class = tid->dev_sclass;
250                 timeri->slave_id = tid->device;
251                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
252                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
253                 snd_timer_check_slave(timeri);
254                 mutex_unlock(&register_mutex);
255                 *ti = timeri;
256                 return 0;
257         }
258
259         /* open a master instance */
260         mutex_lock(&register_mutex);
261         timer = snd_timer_find(tid);
262 #ifdef CONFIG_KMOD
263         if (timer == NULL) {
264                 mutex_unlock(&register_mutex);
265                 snd_timer_request(tid);
266                 mutex_lock(&register_mutex);
267                 timer = snd_timer_find(tid);
268         }
269 #endif
270         if (!timer) {
271                 mutex_unlock(&register_mutex);
272                 return -ENODEV;
273         }
274         if (!list_empty(&timer->open_list_head)) {
275                 timeri = list_entry(timer->open_list_head.next,
276                                     struct snd_timer_instance, open_list);
277                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
278                         mutex_unlock(&register_mutex);
279                         return -EBUSY;
280                 }
281         }
282         timeri = snd_timer_instance_new(owner, timer);
283         if (!timeri) {
284                 mutex_unlock(&register_mutex);
285                 return -ENOMEM;
286         }
287         timeri->slave_class = tid->dev_sclass;
288         timeri->slave_id = slave_id;
289         if (list_empty(&timer->open_list_head) && timer->hw.open)
290                 timer->hw.open(timer);
291         list_add_tail(&timeri->open_list, &timer->open_list_head);
292         snd_timer_check_master(timeri);
293         mutex_unlock(&register_mutex);
294         *ti = timeri;
295         return 0;
296 }
297
298 static int _snd_timer_stop(struct snd_timer_instance *timeri,
299                            int keep_flag, int event);
300
301 /*
302  * close a timer instance
303  */
304 int snd_timer_close(struct snd_timer_instance *timeri)
305 {
306         struct snd_timer *timer = NULL;
307         struct snd_timer_instance *slave, *tmp;
308
309         snd_assert(timeri != NULL, return -ENXIO);
310
311         /* force to stop the timer */
312         snd_timer_stop(timeri);
313
314         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
315                 /* wait, until the active callback is finished */
316                 spin_lock_irq(&slave_active_lock);
317                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
318                         spin_unlock_irq(&slave_active_lock);
319                         udelay(10);
320                         spin_lock_irq(&slave_active_lock);
321                 }
322                 spin_unlock_irq(&slave_active_lock);
323                 mutex_lock(&register_mutex);
324                 list_del(&timeri->open_list);
325                 mutex_unlock(&register_mutex);
326         } else {
327                 timer = timeri->timer;
328                 /* wait, until the active callback is finished */
329                 spin_lock_irq(&timer->lock);
330                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
331                         spin_unlock_irq(&timer->lock);
332                         udelay(10);
333                         spin_lock_irq(&timer->lock);
334                 }
335                 spin_unlock_irq(&timer->lock);
336                 mutex_lock(&register_mutex);
337                 list_del(&timeri->open_list);
338                 if (timer && list_empty(&timer->open_list_head) &&
339                     timer->hw.close)
340                         timer->hw.close(timer);
341                 /* remove slave links */
342                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
343                                          open_list) {
344                         spin_lock_irq(&slave_active_lock);
345                         _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
346                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
347                         slave->master = NULL;
348                         slave->timer = NULL;
349                         spin_unlock_irq(&slave_active_lock);
350                 }
351                 mutex_unlock(&register_mutex);
352         }
353         if (timeri->private_free)
354                 timeri->private_free(timeri);
355         kfree(timeri->owner);
356         kfree(timeri);
357         if (timer)
358                 module_put(timer->module);
359         return 0;
360 }
361
362 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
363 {
364         struct snd_timer * timer;
365
366         if (timeri == NULL)
367                 return 0;
368         if ((timer = timeri->timer) != NULL) {
369                 if (timer->hw.c_resolution)
370                         return timer->hw.c_resolution(timer);
371                 return timer->hw.resolution;
372         }
373         return 0;
374 }
375
376 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
377 {
378         struct snd_timer *timer;
379         unsigned long flags;
380         unsigned long resolution = 0;
381         struct snd_timer_instance *ts;
382         struct timespec tstamp;
383
384         getnstimeofday(&tstamp);
385         snd_assert(event >= SNDRV_TIMER_EVENT_START &&
386                    event <= SNDRV_TIMER_EVENT_PAUSE, return);
387         if (event == SNDRV_TIMER_EVENT_START ||
388             event == SNDRV_TIMER_EVENT_CONTINUE)
389                 resolution = snd_timer_resolution(ti);
390         if (ti->ccallback)
391                 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
392         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
393                 return;
394         timer = ti->timer;
395         if (timer == NULL)
396                 return;
397         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
398                 return;
399         spin_lock_irqsave(&timer->lock, flags);
400         list_for_each_entry(ts, &ti->slave_active_head, active_list)
401                 if (ts->ccallback)
402                         ts->ccallback(ti, event + 100, &tstamp, resolution);
403         spin_unlock_irqrestore(&timer->lock, flags);
404 }
405
406 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
407                             unsigned long sticks)
408 {
409         list_del(&timeri->active_list);
410         list_add_tail(&timeri->active_list, &timer->active_list_head);
411         if (timer->running) {
412                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
413                         goto __start_now;
414                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
415                 timeri->flags |= SNDRV_TIMER_IFLG_START;
416                 return 1;       /* delayed start */
417         } else {
418                 timer->sticks = sticks;
419                 timer->hw.start(timer);
420               __start_now:
421                 timer->running++;
422                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
423                 return 0;
424         }
425 }
426
427 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
428 {
429         unsigned long flags;
430
431         spin_lock_irqsave(&slave_active_lock, flags);
432         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
433         if (timeri->master)
434                 list_add_tail(&timeri->active_list,
435                               &timeri->master->slave_active_head);
436         spin_unlock_irqrestore(&slave_active_lock, flags);
437         return 1; /* delayed start */
438 }
439
440 /*
441  *  start the timer instance
442  */
443 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
444 {
445         struct snd_timer *timer;
446         int result = -EINVAL;
447         unsigned long flags;
448
449         if (timeri == NULL || ticks < 1)
450                 return -EINVAL;
451         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
452                 result = snd_timer_start_slave(timeri);
453                 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
454                 return result;
455         }
456         timer = timeri->timer;
457         if (timer == NULL)
458                 return -EINVAL;
459         spin_lock_irqsave(&timer->lock, flags);
460         timeri->ticks = timeri->cticks = ticks;
461         timeri->pticks = 0;
462         result = snd_timer_start1(timer, timeri, ticks);
463         spin_unlock_irqrestore(&timer->lock, flags);
464         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
465         return result;
466 }
467
468 static int _snd_timer_stop(struct snd_timer_instance * timeri,
469                            int keep_flag, int event)
470 {
471         struct snd_timer *timer;
472         unsigned long flags;
473
474         snd_assert(timeri != NULL, return -ENXIO);
475
476         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
477                 if (!keep_flag) {
478                         spin_lock_irqsave(&slave_active_lock, flags);
479                         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
480                         spin_unlock_irqrestore(&slave_active_lock, flags);
481                 }
482                 goto __end;
483         }
484         timer = timeri->timer;
485         if (!timer)
486                 return -EINVAL;
487         spin_lock_irqsave(&timer->lock, flags);
488         list_del_init(&timeri->ack_list);
489         list_del_init(&timeri->active_list);
490         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
491             !(--timer->running)) {
492                 timer->hw.stop(timer);
493                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
494                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
495                         snd_timer_reschedule(timer, 0);
496                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
497                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
498                                 timer->hw.start(timer);
499                         }
500                 }
501         }
502         if (!keep_flag)
503                 timeri->flags &=
504                         ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
505         spin_unlock_irqrestore(&timer->lock, flags);
506       __end:
507         if (event != SNDRV_TIMER_EVENT_RESOLUTION)
508                 snd_timer_notify1(timeri, event);
509         return 0;
510 }
511
512 /*
513  * stop the timer instance.
514  *
515  * do not call this from the timer callback!
516  */
517 int snd_timer_stop(struct snd_timer_instance *timeri)
518 {
519         struct snd_timer *timer;
520         unsigned long flags;
521         int err;
522
523         err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
524         if (err < 0)
525                 return err;
526         timer = timeri->timer;
527         spin_lock_irqsave(&timer->lock, flags);
528         timeri->cticks = timeri->ticks;
529         timeri->pticks = 0;
530         spin_unlock_irqrestore(&timer->lock, flags);
531         return 0;
532 }
533
534 /*
535  * start again..  the tick is kept.
536  */
537 int snd_timer_continue(struct snd_timer_instance *timeri)
538 {
539         struct snd_timer *timer;
540         int result = -EINVAL;
541         unsigned long flags;
542
543         if (timeri == NULL)
544                 return result;
545         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
546                 return snd_timer_start_slave(timeri);
547         timer = timeri->timer;
548         if (! timer)
549                 return -EINVAL;
550         spin_lock_irqsave(&timer->lock, flags);
551         if (!timeri->cticks)
552                 timeri->cticks = 1;
553         timeri->pticks = 0;
554         result = snd_timer_start1(timer, timeri, timer->sticks);
555         spin_unlock_irqrestore(&timer->lock, flags);
556         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
557         return result;
558 }
559
560 /*
561  * pause.. remember the ticks left
562  */
563 int snd_timer_pause(struct snd_timer_instance * timeri)
564 {
565         return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
566 }
567
568 /*
569  * reschedule the timer
570  *
571  * start pending instances and check the scheduling ticks.
572  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
573  */
574 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
575 {
576         struct snd_timer_instance *ti;
577         unsigned long ticks = ~0UL;
578
579         list_for_each_entry(ti, &timer->active_list_head, active_list) {
580                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
581                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
582                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
583                         timer->running++;
584                 }
585                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
586                         if (ticks > ti->cticks)
587                                 ticks = ti->cticks;
588                 }
589         }
590         if (ticks == ~0UL) {
591                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
592                 return;
593         }
594         if (ticks > timer->hw.ticks)
595                 ticks = timer->hw.ticks;
596         if (ticks_left != ticks)
597                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
598         timer->sticks = ticks;
599 }
600
601 /*
602  * timer tasklet
603  *
604  */
605 static void snd_timer_tasklet(unsigned long arg)
606 {
607         struct snd_timer *timer = (struct snd_timer *) arg;
608         struct snd_timer_instance *ti;
609         struct list_head *p;
610         unsigned long resolution, ticks;
611         unsigned long flags;
612
613         spin_lock_irqsave(&timer->lock, flags);
614         /* now process all callbacks */
615         while (!list_empty(&timer->sack_list_head)) {
616                 p = timer->sack_list_head.next;         /* get first item */
617                 ti = list_entry(p, struct snd_timer_instance, ack_list);
618
619                 /* remove from ack_list and make empty */
620                 list_del_init(p);
621
622                 ticks = ti->pticks;
623                 ti->pticks = 0;
624                 resolution = ti->resolution;
625
626                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
627                 spin_unlock(&timer->lock);
628                 if (ti->callback)
629                         ti->callback(ti, resolution, ticks);
630                 spin_lock(&timer->lock);
631                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
632         }
633         spin_unlock_irqrestore(&timer->lock, flags);
634 }
635
636 /*
637  * timer interrupt
638  *
639  * ticks_left is usually equal to timer->sticks.
640  *
641  */
642 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
643 {
644         struct snd_timer_instance *ti, *ts, *tmp;
645         unsigned long resolution, ticks;
646         struct list_head *p, *ack_list_head;
647         unsigned long flags;
648         int use_tasklet = 0;
649
650         if (timer == NULL)
651                 return;
652
653         spin_lock_irqsave(&timer->lock, flags);
654
655         /* remember the current resolution */
656         if (timer->hw.c_resolution)
657                 resolution = timer->hw.c_resolution(timer);
658         else
659                 resolution = timer->hw.resolution;
660
661         /* loop for all active instances
662          * Here we cannot use list_for_each_entry because the active_list of a
663          * processed instance is relinked to done_list_head before the callback
664          * is called.
665          */
666         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
667                                  active_list) {
668                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
669                         continue;
670                 ti->pticks += ticks_left;
671                 ti->resolution = resolution;
672                 if (ti->cticks < ticks_left)
673                         ti->cticks = 0;
674                 else
675                         ti->cticks -= ticks_left;
676                 if (ti->cticks) /* not expired */
677                         continue;
678                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
679                         ti->cticks = ti->ticks;
680                 } else {
681                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
682                         if (--timer->running)
683                                 list_del(&ti->active_list);
684                 }
685                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
686                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
687                         ack_list_head = &timer->ack_list_head;
688                 else
689                         ack_list_head = &timer->sack_list_head;
690                 if (list_empty(&ti->ack_list))
691                         list_add_tail(&ti->ack_list, ack_list_head);
692                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
693                         ts->pticks = ti->pticks;
694                         ts->resolution = resolution;
695                         if (list_empty(&ts->ack_list))
696                                 list_add_tail(&ts->ack_list, ack_list_head);
697                 }
698         }
699         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
700                 snd_timer_reschedule(timer, timer->sticks);
701         if (timer->running) {
702                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
703                         timer->hw.stop(timer);
704                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
705                 }
706                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
707                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
708                         /* restart timer */
709                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
710                         timer->hw.start(timer);
711                 }
712         } else {
713                 timer->hw.stop(timer);
714         }
715
716         /* now process all fast callbacks */
717         while (!list_empty(&timer->ack_list_head)) {
718                 p = timer->ack_list_head.next;          /* get first item */
719                 ti = list_entry(p, struct snd_timer_instance, ack_list);
720
721                 /* remove from ack_list and make empty */
722                 list_del_init(p);
723
724                 ticks = ti->pticks;
725                 ti->pticks = 0;
726
727                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
728                 spin_unlock(&timer->lock);
729                 if (ti->callback)
730                         ti->callback(ti, resolution, ticks);
731                 spin_lock(&timer->lock);
732                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
733         }
734
735         /* do we have any slow callbacks? */
736         use_tasklet = !list_empty(&timer->sack_list_head);
737         spin_unlock_irqrestore(&timer->lock, flags);
738
739         if (use_tasklet)
740                 tasklet_hi_schedule(&timer->task_queue);
741 }
742
743 /*
744
745  */
746
747 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
748                   struct snd_timer **rtimer)
749 {
750         struct snd_timer *timer;
751         int err;
752         static struct snd_device_ops ops = {
753                 .dev_free = snd_timer_dev_free,
754                 .dev_register = snd_timer_dev_register,
755                 .dev_disconnect = snd_timer_dev_disconnect,
756         };
757
758         snd_assert(tid != NULL, return -EINVAL);
759         snd_assert(rtimer != NULL, return -EINVAL);
760         *rtimer = NULL;
761         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
762         if (timer == NULL) {
763                 snd_printk(KERN_ERR "timer: cannot allocate\n");
764                 return -ENOMEM;
765         }
766         timer->tmr_class = tid->dev_class;
767         timer->card = card;
768         timer->tmr_device = tid->device;
769         timer->tmr_subdevice = tid->subdevice;
770         if (id)
771                 strlcpy(timer->id, id, sizeof(timer->id));
772         INIT_LIST_HEAD(&timer->device_list);
773         INIT_LIST_HEAD(&timer->open_list_head);
774         INIT_LIST_HEAD(&timer->active_list_head);
775         INIT_LIST_HEAD(&timer->ack_list_head);
776         INIT_LIST_HEAD(&timer->sack_list_head);
777         spin_lock_init(&timer->lock);
778         tasklet_init(&timer->task_queue, snd_timer_tasklet,
779                      (unsigned long)timer);
780         if (card != NULL) {
781                 timer->module = card->module;
782                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
783                 if (err < 0) {
784                         snd_timer_free(timer);
785                         return err;
786                 }
787         }
788         *rtimer = timer;
789         return 0;
790 }
791
792 static int snd_timer_free(struct snd_timer *timer)
793 {
794         snd_assert(timer != NULL, return -ENXIO);
795
796         mutex_lock(&register_mutex);
797         if (! list_empty(&timer->open_list_head)) {
798                 struct list_head *p, *n;
799                 struct snd_timer_instance *ti;
800                 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
801                 list_for_each_safe(p, n, &timer->open_list_head) {
802                         list_del_init(p);
803                         ti = list_entry(p, struct snd_timer_instance, open_list);
804                         ti->timer = NULL;
805                 }
806         }
807         list_del(&timer->device_list);
808         mutex_unlock(&register_mutex);
809
810         if (timer->private_free)
811                 timer->private_free(timer);
812         kfree(timer);
813         return 0;
814 }
815
816 static int snd_timer_dev_free(struct snd_device *device)
817 {
818         struct snd_timer *timer = device->device_data;
819         return snd_timer_free(timer);
820 }
821
822 static int snd_timer_dev_register(struct snd_device *dev)
823 {
824         struct snd_timer *timer = dev->device_data;
825         struct snd_timer *timer1;
826
827         snd_assert(timer != NULL && timer->hw.start != NULL &&
828                    timer->hw.stop != NULL, return -ENXIO);
829         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
830             !timer->hw.resolution && timer->hw.c_resolution == NULL)
831                 return -EINVAL;
832
833         mutex_lock(&register_mutex);
834         list_for_each_entry(timer1, &snd_timer_list, device_list) {
835                 if (timer1->tmr_class > timer->tmr_class)
836                         break;
837                 if (timer1->tmr_class < timer->tmr_class)
838                         continue;
839                 if (timer1->card && timer->card) {
840                         if (timer1->card->number > timer->card->number)
841                                 break;
842                         if (timer1->card->number < timer->card->number)
843                                 continue;
844                 }
845                 if (timer1->tmr_device > timer->tmr_device)
846                         break;
847                 if (timer1->tmr_device < timer->tmr_device)
848                         continue;
849                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
850                         break;
851                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
852                         continue;
853                 /* conflicts.. */
854                 mutex_unlock(&register_mutex);
855                 return -EBUSY;
856         }
857         list_add_tail(&timer->device_list, &timer1->device_list);
858         mutex_unlock(&register_mutex);
859         return 0;
860 }
861
862 static int snd_timer_dev_disconnect(struct snd_device *device)
863 {
864         struct snd_timer *timer = device->device_data;
865         mutex_lock(&register_mutex);
866         list_del_init(&timer->device_list);
867         mutex_unlock(&register_mutex);
868         return 0;
869 }
870
871 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
872 {
873         unsigned long flags;
874         unsigned long resolution = 0;
875         struct snd_timer_instance *ti, *ts;
876
877         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
878                 return;
879         snd_assert(event >= SNDRV_TIMER_EVENT_MSTART &&
880                    event <= SNDRV_TIMER_EVENT_MRESUME, return);
881         spin_lock_irqsave(&timer->lock, flags);
882         if (event == SNDRV_TIMER_EVENT_MSTART ||
883             event == SNDRV_TIMER_EVENT_MCONTINUE ||
884             event == SNDRV_TIMER_EVENT_MRESUME) {
885                 if (timer->hw.c_resolution)
886                         resolution = timer->hw.c_resolution(timer);
887                 else
888                         resolution = timer->hw.resolution;
889         }
890         list_for_each_entry(ti, &timer->active_list_head, active_list) {
891                 if (ti->ccallback)
892                         ti->ccallback(ti, event, tstamp, resolution);
893                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
894                         if (ts->ccallback)
895                                 ts->ccallback(ts, event, tstamp, resolution);
896         }
897         spin_unlock_irqrestore(&timer->lock, flags);
898 }
899
900 /*
901  * exported functions for global timers
902  */
903 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
904 {
905         struct snd_timer_id tid;
906
907         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
908         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
909         tid.card = -1;
910         tid.device = device;
911         tid.subdevice = 0;
912         return snd_timer_new(NULL, id, &tid, rtimer);
913 }
914
915 int snd_timer_global_free(struct snd_timer *timer)
916 {
917         return snd_timer_free(timer);
918 }
919
920 int snd_timer_global_register(struct snd_timer *timer)
921 {
922         struct snd_device dev;
923
924         memset(&dev, 0, sizeof(dev));
925         dev.device_data = timer;
926         return snd_timer_dev_register(&dev);
927 }
928
929 /*
930  *  System timer
931  */
932
933 struct snd_timer_system_private {
934         struct timer_list tlist;
935         unsigned long last_expires;
936         unsigned long last_jiffies;
937         unsigned long correction;
938 };
939
940 static void snd_timer_s_function(unsigned long data)
941 {
942         struct snd_timer *timer = (struct snd_timer *)data;
943         struct snd_timer_system_private *priv = timer->private_data;
944         unsigned long jiff = jiffies;
945         if (time_after(jiff, priv->last_expires))
946                 priv->correction += (long)jiff - (long)priv->last_expires;
947         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
948 }
949
950 static int snd_timer_s_start(struct snd_timer * timer)
951 {
952         struct snd_timer_system_private *priv;
953         unsigned long njiff;
954
955         priv = (struct snd_timer_system_private *) timer->private_data;
956         njiff = (priv->last_jiffies = jiffies);
957         if (priv->correction > timer->sticks - 1) {
958                 priv->correction -= timer->sticks - 1;
959                 njiff++;
960         } else {
961                 njiff += timer->sticks - priv->correction;
962                 priv->correction = 0;
963         }
964         priv->last_expires = priv->tlist.expires = njiff;
965         add_timer(&priv->tlist);
966         return 0;
967 }
968
969 static int snd_timer_s_stop(struct snd_timer * timer)
970 {
971         struct snd_timer_system_private *priv;
972         unsigned long jiff;
973
974         priv = (struct snd_timer_system_private *) timer->private_data;
975         del_timer(&priv->tlist);
976         jiff = jiffies;
977         if (time_before(jiff, priv->last_expires))
978                 timer->sticks = priv->last_expires - jiff;
979         else
980                 timer->sticks = 1;
981         priv->correction = 0;
982         return 0;
983 }
984
985 static struct snd_timer_hardware snd_timer_system =
986 {
987         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
988         .resolution =   1000000000L / HZ,
989         .ticks =        10000000L,
990         .start =        snd_timer_s_start,
991         .stop =         snd_timer_s_stop
992 };
993
994 static void snd_timer_free_system(struct snd_timer *timer)
995 {
996         kfree(timer->private_data);
997 }
998
999 static int snd_timer_register_system(void)
1000 {
1001         struct snd_timer *timer;
1002         struct snd_timer_system_private *priv;
1003         int err;
1004
1005         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1006         if (err < 0)
1007                 return err;
1008         strcpy(timer->name, "system timer");
1009         timer->hw = snd_timer_system;
1010         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1011         if (priv == NULL) {
1012                 snd_timer_free(timer);
1013                 return -ENOMEM;
1014         }
1015         init_timer(&priv->tlist);
1016         priv->tlist.function = snd_timer_s_function;
1017         priv->tlist.data = (unsigned long) timer;
1018         timer->private_data = priv;
1019         timer->private_free = snd_timer_free_system;
1020         return snd_timer_global_register(timer);
1021 }
1022
1023 #ifdef CONFIG_PROC_FS
1024 /*
1025  *  Info interface
1026  */
1027
1028 static void snd_timer_proc_read(struct snd_info_entry *entry,
1029                                 struct snd_info_buffer *buffer)
1030 {
1031         struct snd_timer *timer;
1032         struct snd_timer_instance *ti;
1033
1034         mutex_lock(&register_mutex);
1035         list_for_each_entry(timer, &snd_timer_list, device_list) {
1036                 switch (timer->tmr_class) {
1037                 case SNDRV_TIMER_CLASS_GLOBAL:
1038                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1039                         break;
1040                 case SNDRV_TIMER_CLASS_CARD:
1041                         snd_iprintf(buffer, "C%i-%i: ",
1042                                     timer->card->number, timer->tmr_device);
1043                         break;
1044                 case SNDRV_TIMER_CLASS_PCM:
1045                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1046                                     timer->tmr_device, timer->tmr_subdevice);
1047                         break;
1048                 default:
1049                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1050                                     timer->card ? timer->card->number : -1,
1051                                     timer->tmr_device, timer->tmr_subdevice);
1052                 }
1053                 snd_iprintf(buffer, "%s :", timer->name);
1054                 if (timer->hw.resolution)
1055                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1056                                     timer->hw.resolution / 1000,
1057                                     timer->hw.resolution % 1000,
1058                                     timer->hw.ticks);
1059                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1060                         snd_iprintf(buffer, " SLAVE");
1061                 snd_iprintf(buffer, "\n");
1062                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1063                         snd_iprintf(buffer, "  Client %s : %s\n",
1064                                     ti->owner ? ti->owner : "unknown",
1065                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1066                                                  SNDRV_TIMER_IFLG_RUNNING)
1067                                     ? "running" : "stopped");
1068         }
1069         mutex_unlock(&register_mutex);
1070 }
1071
1072 static struct snd_info_entry *snd_timer_proc_entry;
1073
1074 static void __init snd_timer_proc_init(void)
1075 {
1076         struct snd_info_entry *entry;
1077
1078         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1079         if (entry != NULL) {
1080                 entry->c.text.read = snd_timer_proc_read;
1081                 if (snd_info_register(entry) < 0) {
1082                         snd_info_free_entry(entry);
1083                         entry = NULL;
1084                 }
1085         }
1086         snd_timer_proc_entry = entry;
1087 }
1088
1089 static void __exit snd_timer_proc_done(void)
1090 {
1091         snd_info_free_entry(snd_timer_proc_entry);
1092 }
1093 #else /* !CONFIG_PROC_FS */
1094 #define snd_timer_proc_init()
1095 #define snd_timer_proc_done()
1096 #endif
1097
1098 /*
1099  *  USER SPACE interface
1100  */
1101
1102 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1103                                      unsigned long resolution,
1104                                      unsigned long ticks)
1105 {
1106         struct snd_timer_user *tu = timeri->callback_data;
1107         struct snd_timer_read *r;
1108         int prev;
1109
1110         spin_lock(&tu->qlock);
1111         if (tu->qused > 0) {
1112                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1113                 r = &tu->queue[prev];
1114                 if (r->resolution == resolution) {
1115                         r->ticks += ticks;
1116                         goto __wake;
1117                 }
1118         }
1119         if (tu->qused >= tu->queue_size) {
1120                 tu->overrun++;
1121         } else {
1122                 r = &tu->queue[tu->qtail++];
1123                 tu->qtail %= tu->queue_size;
1124                 r->resolution = resolution;
1125                 r->ticks = ticks;
1126                 tu->qused++;
1127         }
1128       __wake:
1129         spin_unlock(&tu->qlock);
1130         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1131         wake_up(&tu->qchange_sleep);
1132 }
1133
1134 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1135                                             struct snd_timer_tread *tread)
1136 {
1137         if (tu->qused >= tu->queue_size) {
1138                 tu->overrun++;
1139         } else {
1140                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1141                 tu->qtail %= tu->queue_size;
1142                 tu->qused++;
1143         }
1144 }
1145
1146 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1147                                      int event,
1148                                      struct timespec *tstamp,
1149                                      unsigned long resolution)
1150 {
1151         struct snd_timer_user *tu = timeri->callback_data;
1152         struct snd_timer_tread r1;
1153
1154         if (event >= SNDRV_TIMER_EVENT_START &&
1155             event <= SNDRV_TIMER_EVENT_PAUSE)
1156                 tu->tstamp = *tstamp;
1157         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1158                 return;
1159         r1.event = event;
1160         r1.tstamp = *tstamp;
1161         r1.val = resolution;
1162         spin_lock(&tu->qlock);
1163         snd_timer_user_append_to_tqueue(tu, &r1);
1164         spin_unlock(&tu->qlock);
1165         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1166         wake_up(&tu->qchange_sleep);
1167 }
1168
1169 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1170                                       unsigned long resolution,
1171                                       unsigned long ticks)
1172 {
1173         struct snd_timer_user *tu = timeri->callback_data;
1174         struct snd_timer_tread *r, r1;
1175         struct timespec tstamp;
1176         int prev, append = 0;
1177
1178         memset(&tstamp, 0, sizeof(tstamp));
1179         spin_lock(&tu->qlock);
1180         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1181                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1182                 spin_unlock(&tu->qlock);
1183                 return;
1184         }
1185         if (tu->last_resolution != resolution || ticks > 0)
1186                 getnstimeofday(&tstamp);
1187         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1188             tu->last_resolution != resolution) {
1189                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1190                 r1.tstamp = tstamp;
1191                 r1.val = resolution;
1192                 snd_timer_user_append_to_tqueue(tu, &r1);
1193                 tu->last_resolution = resolution;
1194                 append++;
1195         }
1196         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1197                 goto __wake;
1198         if (ticks == 0)
1199                 goto __wake;
1200         if (tu->qused > 0) {
1201                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1202                 r = &tu->tqueue[prev];
1203                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1204                         r->tstamp = tstamp;
1205                         r->val += ticks;
1206                         append++;
1207                         goto __wake;
1208                 }
1209         }
1210         r1.event = SNDRV_TIMER_EVENT_TICK;
1211         r1.tstamp = tstamp;
1212         r1.val = ticks;
1213         snd_timer_user_append_to_tqueue(tu, &r1);
1214         append++;
1215       __wake:
1216         spin_unlock(&tu->qlock);
1217         if (append == 0)
1218                 return;
1219         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1220         wake_up(&tu->qchange_sleep);
1221 }
1222
1223 static int snd_timer_user_open(struct inode *inode, struct file *file)
1224 {
1225         struct snd_timer_user *tu;
1226
1227         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1228         if (tu == NULL)
1229                 return -ENOMEM;
1230         spin_lock_init(&tu->qlock);
1231         init_waitqueue_head(&tu->qchange_sleep);
1232         mutex_init(&tu->tread_sem);
1233         tu->ticks = 1;
1234         tu->queue_size = 128;
1235         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1236                             GFP_KERNEL);
1237         if (tu->queue == NULL) {
1238                 kfree(tu);
1239                 return -ENOMEM;
1240         }
1241         file->private_data = tu;
1242         return 0;
1243 }
1244
1245 static int snd_timer_user_release(struct inode *inode, struct file *file)
1246 {
1247         struct snd_timer_user *tu;
1248
1249         if (file->private_data) {
1250                 tu = file->private_data;
1251                 file->private_data = NULL;
1252                 fasync_helper(-1, file, 0, &tu->fasync);
1253                 if (tu->timeri)
1254                         snd_timer_close(tu->timeri);
1255                 kfree(tu->queue);
1256                 kfree(tu->tqueue);
1257                 kfree(tu);
1258         }
1259         return 0;
1260 }
1261
1262 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1263 {
1264         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1265         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1266         id->card = -1;
1267         id->device = -1;
1268         id->subdevice = -1;
1269 }
1270
1271 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1272 {
1273         id->dev_class = timer->tmr_class;
1274         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1275         id->card = timer->card ? timer->card->number : -1;
1276         id->device = timer->tmr_device;
1277         id->subdevice = timer->tmr_subdevice;
1278 }
1279
1280 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1281 {
1282         struct snd_timer_id id;
1283         struct snd_timer *timer;
1284         struct list_head *p;
1285
1286         if (copy_from_user(&id, _tid, sizeof(id)))
1287                 return -EFAULT;
1288         mutex_lock(&register_mutex);
1289         if (id.dev_class < 0) {         /* first item */
1290                 if (list_empty(&snd_timer_list))
1291                         snd_timer_user_zero_id(&id);
1292                 else {
1293                         timer = list_entry(snd_timer_list.next,
1294                                            struct snd_timer, device_list);
1295                         snd_timer_user_copy_id(&id, timer);
1296                 }
1297         } else {
1298                 switch (id.dev_class) {
1299                 case SNDRV_TIMER_CLASS_GLOBAL:
1300                         id.device = id.device < 0 ? 0 : id.device + 1;
1301                         list_for_each(p, &snd_timer_list) {
1302                                 timer = list_entry(p, struct snd_timer, device_list);
1303                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1304                                         snd_timer_user_copy_id(&id, timer);
1305                                         break;
1306                                 }
1307                                 if (timer->tmr_device >= id.device) {
1308                                         snd_timer_user_copy_id(&id, timer);
1309                                         break;
1310                                 }
1311                         }
1312                         if (p == &snd_timer_list)
1313                                 snd_timer_user_zero_id(&id);
1314                         break;
1315                 case SNDRV_TIMER_CLASS_CARD:
1316                 case SNDRV_TIMER_CLASS_PCM:
1317                         if (id.card < 0) {
1318                                 id.card = 0;
1319                         } else {
1320                                 if (id.card < 0) {
1321                                         id.card = 0;
1322                                 } else {
1323                                         if (id.device < 0) {
1324                                                 id.device = 0;
1325                                         } else {
1326                                                 if (id.subdevice < 0) {
1327                                                         id.subdevice = 0;
1328                                                 } else {
1329                                                         id.subdevice++;
1330                                                 }
1331                                         }
1332                                 }
1333                         }
1334                         list_for_each(p, &snd_timer_list) {
1335                                 timer = list_entry(p, struct snd_timer, device_list);
1336                                 if (timer->tmr_class > id.dev_class) {
1337                                         snd_timer_user_copy_id(&id, timer);
1338                                         break;
1339                                 }
1340                                 if (timer->tmr_class < id.dev_class)
1341                                         continue;
1342                                 if (timer->card->number > id.card) {
1343                                         snd_timer_user_copy_id(&id, timer);
1344                                         break;
1345                                 }
1346                                 if (timer->card->number < id.card)
1347                                         continue;
1348                                 if (timer->tmr_device > id.device) {
1349                                         snd_timer_user_copy_id(&id, timer);
1350                                         break;
1351                                 }
1352                                 if (timer->tmr_device < id.device)
1353                                         continue;
1354                                 if (timer->tmr_subdevice > id.subdevice) {
1355                                         snd_timer_user_copy_id(&id, timer);
1356                                         break;
1357                                 }
1358                                 if (timer->tmr_subdevice < id.subdevice)
1359                                         continue;
1360                                 snd_timer_user_copy_id(&id, timer);
1361                                 break;
1362                         }
1363                         if (p == &snd_timer_list)
1364                                 snd_timer_user_zero_id(&id);
1365                         break;
1366                 default:
1367                         snd_timer_user_zero_id(&id);
1368                 }
1369         }
1370         mutex_unlock(&register_mutex);
1371         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1372                 return -EFAULT;
1373         return 0;
1374 }
1375
1376 static int snd_timer_user_ginfo(struct file *file,
1377                                 struct snd_timer_ginfo __user *_ginfo)
1378 {
1379         struct snd_timer_ginfo *ginfo;
1380         struct snd_timer_id tid;
1381         struct snd_timer *t;
1382         struct list_head *p;
1383         int err = 0;
1384
1385         ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1386         if (! ginfo)
1387                 return -ENOMEM;
1388         if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1389                 kfree(ginfo);
1390                 return -EFAULT;
1391         }
1392         tid = ginfo->tid;
1393         memset(ginfo, 0, sizeof(*ginfo));
1394         ginfo->tid = tid;
1395         mutex_lock(&register_mutex);
1396         t = snd_timer_find(&tid);
1397         if (t != NULL) {
1398                 ginfo->card = t->card ? t->card->number : -1;
1399                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1400                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1401                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1402                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1403                 ginfo->resolution = t->hw.resolution;
1404                 if (t->hw.resolution_min > 0) {
1405                         ginfo->resolution_min = t->hw.resolution_min;
1406                         ginfo->resolution_max = t->hw.resolution_max;
1407                 }
1408                 list_for_each(p, &t->open_list_head) {
1409                         ginfo->clients++;
1410                 }
1411         } else {
1412                 err = -ENODEV;
1413         }
1414         mutex_unlock(&register_mutex);
1415         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1416                 err = -EFAULT;
1417         kfree(ginfo);
1418         return err;
1419 }
1420
1421 static int snd_timer_user_gparams(struct file *file,
1422                                   struct snd_timer_gparams __user *_gparams)
1423 {
1424         struct snd_timer_gparams gparams;
1425         struct snd_timer *t;
1426         int err;
1427
1428         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1429                 return -EFAULT;
1430         mutex_lock(&register_mutex);
1431         t = snd_timer_find(&gparams.tid);
1432         if (!t) {
1433                 err = -ENODEV;
1434                 goto _error;
1435         }
1436         if (!list_empty(&t->open_list_head)) {
1437                 err = -EBUSY;
1438                 goto _error;
1439         }
1440         if (!t->hw.set_period) {
1441                 err = -ENOSYS;
1442                 goto _error;
1443         }
1444         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1445 _error:
1446         mutex_unlock(&register_mutex);
1447         return err;
1448 }
1449
1450 static int snd_timer_user_gstatus(struct file *file,
1451                                   struct snd_timer_gstatus __user *_gstatus)
1452 {
1453         struct snd_timer_gstatus gstatus;
1454         struct snd_timer_id tid;
1455         struct snd_timer *t;
1456         int err = 0;
1457
1458         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1459                 return -EFAULT;
1460         tid = gstatus.tid;
1461         memset(&gstatus, 0, sizeof(gstatus));
1462         gstatus.tid = tid;
1463         mutex_lock(&register_mutex);
1464         t = snd_timer_find(&tid);
1465         if (t != NULL) {
1466                 if (t->hw.c_resolution)
1467                         gstatus.resolution = t->hw.c_resolution(t);
1468                 else
1469                         gstatus.resolution = t->hw.resolution;
1470                 if (t->hw.precise_resolution) {
1471                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1472                                                  &gstatus.resolution_den);
1473                 } else {
1474                         gstatus.resolution_num = gstatus.resolution;
1475                         gstatus.resolution_den = 1000000000uL;
1476                 }
1477         } else {
1478                 err = -ENODEV;
1479         }
1480         mutex_unlock(&register_mutex);
1481         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1482                 err = -EFAULT;
1483         return err;
1484 }
1485
1486 static int snd_timer_user_tselect(struct file *file,
1487                                   struct snd_timer_select __user *_tselect)
1488 {
1489         struct snd_timer_user *tu;
1490         struct snd_timer_select tselect;
1491         char str[32];
1492         int err = 0;
1493
1494         tu = file->private_data;
1495         mutex_lock(&tu->tread_sem);
1496         if (tu->timeri) {
1497                 snd_timer_close(tu->timeri);
1498                 tu->timeri = NULL;
1499         }
1500         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1501                 err = -EFAULT;
1502                 goto __err;
1503         }
1504         sprintf(str, "application %i", current->pid);
1505         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1506                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1507         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1508         if (err < 0)
1509                 goto __err;
1510
1511         kfree(tu->queue);
1512         tu->queue = NULL;
1513         kfree(tu->tqueue);
1514         tu->tqueue = NULL;
1515         if (tu->tread) {
1516                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1517                                      GFP_KERNEL);
1518                 if (tu->tqueue == NULL)
1519                         err = -ENOMEM;
1520         } else {
1521                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1522                                     GFP_KERNEL);
1523                 if (tu->queue == NULL)
1524                         err = -ENOMEM;
1525         }
1526
1527         if (err < 0) {
1528                 snd_timer_close(tu->timeri);
1529                 tu->timeri = NULL;
1530         } else {
1531                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1532                 tu->timeri->callback = tu->tread
1533                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1534                 tu->timeri->ccallback = snd_timer_user_ccallback;
1535                 tu->timeri->callback_data = (void *)tu;
1536         }
1537
1538       __err:
1539         mutex_unlock(&tu->tread_sem);
1540         return err;
1541 }
1542
1543 static int snd_timer_user_info(struct file *file,
1544                                struct snd_timer_info __user *_info)
1545 {
1546         struct snd_timer_user *tu;
1547         struct snd_timer_info *info;
1548         struct snd_timer *t;
1549         int err = 0;
1550
1551         tu = file->private_data;
1552         if (!tu->timeri)
1553                 return -EBADFD;
1554         t = tu->timeri->timer;
1555         if (!t)
1556                 return -EBADFD;
1557
1558         info = kzalloc(sizeof(*info), GFP_KERNEL);
1559         if (! info)
1560                 return -ENOMEM;
1561         info->card = t->card ? t->card->number : -1;
1562         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1563                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1564         strlcpy(info->id, t->id, sizeof(info->id));
1565         strlcpy(info->name, t->name, sizeof(info->name));
1566         info->resolution = t->hw.resolution;
1567         if (copy_to_user(_info, info, sizeof(*_info)))
1568                 err = -EFAULT;
1569         kfree(info);
1570         return err;
1571 }
1572
1573 static int snd_timer_user_params(struct file *file,
1574                                  struct snd_timer_params __user *_params)
1575 {
1576         struct snd_timer_user *tu;
1577         struct snd_timer_params params;
1578         struct snd_timer *t;
1579         struct snd_timer_read *tr;
1580         struct snd_timer_tread *ttr;
1581         int err;
1582
1583         tu = file->private_data;
1584         if (!tu->timeri)
1585                 return -EBADFD;
1586         t = tu->timeri->timer;
1587         if (!t)
1588                 return -EBADFD;
1589         if (copy_from_user(&params, _params, sizeof(params)))
1590                 return -EFAULT;
1591         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1592                 err = -EINVAL;
1593                 goto _end;
1594         }
1595         if (params.queue_size > 0 &&
1596             (params.queue_size < 32 || params.queue_size > 1024)) {
1597                 err = -EINVAL;
1598                 goto _end;
1599         }
1600         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1601                               (1<<SNDRV_TIMER_EVENT_TICK)|
1602                               (1<<SNDRV_TIMER_EVENT_START)|
1603                               (1<<SNDRV_TIMER_EVENT_STOP)|
1604                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1605                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1606                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1607                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1608                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1609                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1610                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1611                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1612                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1613                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1614                 err = -EINVAL;
1615                 goto _end;
1616         }
1617         snd_timer_stop(tu->timeri);
1618         spin_lock_irq(&t->lock);
1619         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1620                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1621                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1622         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1623                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1624         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1625                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1626         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1627                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1628         spin_unlock_irq(&t->lock);
1629         if (params.queue_size > 0 &&
1630             (unsigned int)tu->queue_size != params.queue_size) {
1631                 if (tu->tread) {
1632                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1633                                       GFP_KERNEL);
1634                         if (ttr) {
1635                                 kfree(tu->tqueue);
1636                                 tu->queue_size = params.queue_size;
1637                                 tu->tqueue = ttr;
1638                         }
1639                 } else {
1640                         tr = kmalloc(params.queue_size * sizeof(*tr),
1641                                      GFP_KERNEL);
1642                         if (tr) {
1643                                 kfree(tu->queue);
1644                                 tu->queue_size = params.queue_size;
1645                                 tu->queue = tr;
1646                         }
1647                 }
1648         }
1649         tu->qhead = tu->qtail = tu->qused = 0;
1650         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1651                 if (tu->tread) {
1652                         struct snd_timer_tread tread;
1653                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1654                         tread.tstamp.tv_sec = 0;
1655                         tread.tstamp.tv_nsec = 0;
1656                         tread.val = 0;
1657                         snd_timer_user_append_to_tqueue(tu, &tread);
1658                 } else {
1659                         struct snd_timer_read *r = &tu->queue[0];
1660                         r->resolution = 0;
1661                         r->ticks = 0;
1662                         tu->qused++;
1663                         tu->qtail++;
1664                 }
1665         }
1666         tu->filter = params.filter;
1667         tu->ticks = params.ticks;
1668         err = 0;
1669  _end:
1670         if (copy_to_user(_params, &params, sizeof(params)))
1671                 return -EFAULT;
1672         return err;
1673 }
1674
1675 static int snd_timer_user_status(struct file *file,
1676                                  struct snd_timer_status __user *_status)
1677 {
1678         struct snd_timer_user *tu;
1679         struct snd_timer_status status;
1680
1681         tu = file->private_data;
1682         if (!tu->timeri)
1683                 return -EBADFD;
1684         memset(&status, 0, sizeof(status));
1685         status.tstamp = tu->tstamp;
1686         status.resolution = snd_timer_resolution(tu->timeri);
1687         status.lost = tu->timeri->lost;
1688         status.overrun = tu->overrun;
1689         spin_lock_irq(&tu->qlock);
1690         status.queue = tu->qused;
1691         spin_unlock_irq(&tu->qlock);
1692         if (copy_to_user(_status, &status, sizeof(status)))
1693                 return -EFAULT;
1694         return 0;
1695 }
1696
1697 static int snd_timer_user_start(struct file *file)
1698 {
1699         int err;
1700         struct snd_timer_user *tu;
1701
1702         tu = file->private_data;
1703         if (!tu->timeri)
1704                 return -EBADFD;
1705         snd_timer_stop(tu->timeri);
1706         tu->timeri->lost = 0;
1707         tu->last_resolution = 0;
1708         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1709 }
1710
1711 static int snd_timer_user_stop(struct file *file)
1712 {
1713         int err;
1714         struct snd_timer_user *tu;
1715
1716         tu = file->private_data;
1717         if (!tu->timeri)
1718                 return -EBADFD;
1719         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1720 }
1721
1722 static int snd_timer_user_continue(struct file *file)
1723 {
1724         int err;
1725         struct snd_timer_user *tu;
1726
1727         tu = file->private_data;
1728         if (!tu->timeri)
1729                 return -EBADFD;
1730         tu->timeri->lost = 0;
1731         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1732 }
1733
1734 static int snd_timer_user_pause(struct file *file)
1735 {
1736         int err;
1737         struct snd_timer_user *tu;
1738
1739         tu = file->private_data;
1740         if (!tu->timeri)
1741                 return -EBADFD;
1742         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1743 }
1744
1745 enum {
1746         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1747         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1748         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1749         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1750 };
1751
1752 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1753                                  unsigned long arg)
1754 {
1755         struct snd_timer_user *tu;
1756         void __user *argp = (void __user *)arg;
1757         int __user *p = argp;
1758
1759         tu = file->private_data;
1760         switch (cmd) {
1761         case SNDRV_TIMER_IOCTL_PVERSION:
1762                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1763         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1764                 return snd_timer_user_next_device(argp);
1765         case SNDRV_TIMER_IOCTL_TREAD:
1766         {
1767                 int xarg;
1768
1769                 mutex_lock(&tu->tread_sem);
1770                 if (tu->timeri) {       /* too late */
1771                         mutex_unlock(&tu->tread_sem);
1772                         return -EBUSY;
1773                 }
1774                 if (get_user(xarg, p)) {
1775                         mutex_unlock(&tu->tread_sem);
1776                         return -EFAULT;
1777                 }
1778                 tu->tread = xarg ? 1 : 0;
1779                 mutex_unlock(&tu->tread_sem);
1780                 return 0;
1781         }
1782         case SNDRV_TIMER_IOCTL_GINFO:
1783                 return snd_timer_user_ginfo(file, argp);
1784         case SNDRV_TIMER_IOCTL_GPARAMS:
1785                 return snd_timer_user_gparams(file, argp);
1786         case SNDRV_TIMER_IOCTL_GSTATUS:
1787                 return snd_timer_user_gstatus(file, argp);
1788         case SNDRV_TIMER_IOCTL_SELECT:
1789                 return snd_timer_user_tselect(file, argp);
1790         case SNDRV_TIMER_IOCTL_INFO:
1791                 return snd_timer_user_info(file, argp);
1792         case SNDRV_TIMER_IOCTL_PARAMS:
1793                 return snd_timer_user_params(file, argp);
1794         case SNDRV_TIMER_IOCTL_STATUS:
1795                 return snd_timer_user_status(file, argp);
1796         case SNDRV_TIMER_IOCTL_START:
1797         case SNDRV_TIMER_IOCTL_START_OLD:
1798                 return snd_timer_user_start(file);
1799         case SNDRV_TIMER_IOCTL_STOP:
1800         case SNDRV_TIMER_IOCTL_STOP_OLD:
1801                 return snd_timer_user_stop(file);
1802         case SNDRV_TIMER_IOCTL_CONTINUE:
1803         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1804                 return snd_timer_user_continue(file);
1805         case SNDRV_TIMER_IOCTL_PAUSE:
1806         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1807                 return snd_timer_user_pause(file);
1808         }
1809         return -ENOTTY;
1810 }
1811
1812 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1813 {
1814         struct snd_timer_user *tu;
1815         int err;
1816
1817         tu = file->private_data;
1818         err = fasync_helper(fd, file, on, &tu->fasync);
1819         if (err < 0)
1820                 return err;
1821         return 0;
1822 }
1823
1824 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1825                                    size_t count, loff_t *offset)
1826 {
1827         struct snd_timer_user *tu;
1828         long result = 0, unit;
1829         int err = 0;
1830
1831         tu = file->private_data;
1832         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1833         spin_lock_irq(&tu->qlock);
1834         while ((long)count - result >= unit) {
1835                 while (!tu->qused) {
1836                         wait_queue_t wait;
1837
1838                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1839                                 err = -EAGAIN;
1840                                 break;
1841                         }
1842
1843                         set_current_state(TASK_INTERRUPTIBLE);
1844                         init_waitqueue_entry(&wait, current);
1845                         add_wait_queue(&tu->qchange_sleep, &wait);
1846
1847                         spin_unlock_irq(&tu->qlock);
1848                         schedule();
1849                         spin_lock_irq(&tu->qlock);
1850
1851                         remove_wait_queue(&tu->qchange_sleep, &wait);
1852
1853                         if (signal_pending(current)) {
1854                                 err = -ERESTARTSYS;
1855                                 break;
1856                         }
1857                 }
1858
1859                 spin_unlock_irq(&tu->qlock);
1860                 if (err < 0)
1861                         goto _error;
1862
1863                 if (tu->tread) {
1864                         if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1865                                          sizeof(struct snd_timer_tread))) {
1866                                 err = -EFAULT;
1867                                 goto _error;
1868                         }
1869                 } else {
1870                         if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1871                                          sizeof(struct snd_timer_read))) {
1872                                 err = -EFAULT;
1873                                 goto _error;
1874                         }
1875                 }
1876
1877                 tu->qhead %= tu->queue_size;
1878
1879                 result += unit;
1880                 buffer += unit;
1881
1882                 spin_lock_irq(&tu->qlock);
1883                 tu->qused--;
1884         }
1885         spin_unlock_irq(&tu->qlock);
1886  _error:
1887         return result > 0 ? result : err;
1888 }
1889
1890 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1891 {
1892         unsigned int mask;
1893         struct snd_timer_user *tu;
1894
1895         tu = file->private_data;
1896
1897         poll_wait(file, &tu->qchange_sleep, wait);
1898
1899         mask = 0;
1900         if (tu->qused)
1901                 mask |= POLLIN | POLLRDNORM;
1902
1903         return mask;
1904 }
1905
1906 #ifdef CONFIG_COMPAT
1907 #include "timer_compat.c"
1908 #else
1909 #define snd_timer_user_ioctl_compat     NULL
1910 #endif
1911
1912 static const struct file_operations snd_timer_f_ops =
1913 {
1914         .owner =        THIS_MODULE,
1915         .read =         snd_timer_user_read,
1916         .open =         snd_timer_user_open,
1917         .release =      snd_timer_user_release,
1918         .poll =         snd_timer_user_poll,
1919         .unlocked_ioctl =       snd_timer_user_ioctl,
1920         .compat_ioctl = snd_timer_user_ioctl_compat,
1921         .fasync =       snd_timer_user_fasync,
1922 };
1923
1924 /*
1925  *  ENTRY functions
1926  */
1927
1928 static int __init alsa_timer_init(void)
1929 {
1930         int err;
1931
1932 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1933         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1934                               "system timer");
1935 #endif
1936
1937         if ((err = snd_timer_register_system()) < 0)
1938                 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1939                            err);
1940         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1941                                        &snd_timer_f_ops, NULL, "timer")) < 0)
1942                 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1943                            err);
1944         snd_timer_proc_init();
1945         return 0;
1946 }
1947
1948 static void __exit alsa_timer_exit(void)
1949 {
1950         struct list_head *p, *n;
1951
1952         snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1953         /* unregister the system timer */
1954         list_for_each_safe(p, n, &snd_timer_list) {
1955                 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1956                 snd_timer_free(timer);
1957         }
1958         snd_timer_proc_done();
1959 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1960         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1961 #endif
1962 }
1963
1964 module_init(alsa_timer_init)
1965 module_exit(alsa_timer_exit)
1966
1967 EXPORT_SYMBOL(snd_timer_open);
1968 EXPORT_SYMBOL(snd_timer_close);
1969 EXPORT_SYMBOL(snd_timer_resolution);
1970 EXPORT_SYMBOL(snd_timer_start);
1971 EXPORT_SYMBOL(snd_timer_stop);
1972 EXPORT_SYMBOL(snd_timer_continue);
1973 EXPORT_SYMBOL(snd_timer_pause);
1974 EXPORT_SYMBOL(snd_timer_new);
1975 EXPORT_SYMBOL(snd_timer_notify);
1976 EXPORT_SYMBOL(snd_timer_global_new);
1977 EXPORT_SYMBOL(snd_timer_global_free);
1978 EXPORT_SYMBOL(snd_timer_global_register);
1979 EXPORT_SYMBOL(snd_timer_interrupt);