ALSA: take tu->qlock with irqs disabled
[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 <linux/delay.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <linux/moduleparam.h>
28 #include <linux/string.h>
29 #include <sound/core.h>
30 #include <sound/timer.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33 #include <sound/minors.h>
34 #include <sound/initval.h>
35 #include <linux/kmod.h>
36
37 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
38 #define DEFAULT_TIMER_LIMIT 3
39 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
40 #define DEFAULT_TIMER_LIMIT 2
41 #else
42 #define DEFAULT_TIMER_LIMIT 1
43 #endif
44
45 static int timer_limit = DEFAULT_TIMER_LIMIT;
46 static int timer_tstamp_monotonic = 1;
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 module_param(timer_tstamp_monotonic, int, 0444);
53 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
54
55 struct snd_timer_user {
56         struct snd_timer_instance *timeri;
57         int tread;              /* enhanced read with timestamps and events */
58         unsigned long ticks;
59         unsigned long overrun;
60         int qhead;
61         int qtail;
62         int qused;
63         int queue_size;
64         struct snd_timer_read *queue;
65         struct snd_timer_tread *tqueue;
66         spinlock_t qlock;
67         unsigned long last_resolution;
68         unsigned int filter;
69         struct timespec tstamp;         /* trigger tstamp */
70         wait_queue_head_t qchange_sleep;
71         struct fasync_struct *fasync;
72         struct mutex tread_sem;
73 };
74
75 /* list of timers */
76 static LIST_HEAD(snd_timer_list);
77
78 /* list of slave instances */
79 static LIST_HEAD(snd_timer_slave_list);
80
81 /* lock for slave active lists */
82 static DEFINE_SPINLOCK(slave_active_lock);
83
84 static DEFINE_MUTEX(register_mutex);
85
86 static int snd_timer_free(struct snd_timer *timer);
87 static int snd_timer_dev_free(struct snd_device *device);
88 static int snd_timer_dev_register(struct snd_device *device);
89 static int snd_timer_dev_disconnect(struct snd_device *device);
90
91 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
92
93 /*
94  * create a timer instance with the given owner string.
95  * when timer is not NULL, increments the module counter
96  */
97 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
98                                                          struct snd_timer *timer)
99 {
100         struct snd_timer_instance *timeri;
101         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
102         if (timeri == NULL)
103                 return NULL;
104         timeri->owner = kstrdup(owner, GFP_KERNEL);
105         if (! timeri->owner) {
106                 kfree(timeri);
107                 return NULL;
108         }
109         INIT_LIST_HEAD(&timeri->open_list);
110         INIT_LIST_HEAD(&timeri->active_list);
111         INIT_LIST_HEAD(&timeri->ack_list);
112         INIT_LIST_HEAD(&timeri->slave_list_head);
113         INIT_LIST_HEAD(&timeri->slave_active_head);
114
115         timeri->timer = timer;
116         if (timer && !try_module_get(timer->module)) {
117                 kfree(timeri->owner);
118                 kfree(timeri);
119                 return NULL;
120         }
121
122         return timeri;
123 }
124
125 /*
126  * find a timer instance from the given timer id
127  */
128 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
129 {
130         struct snd_timer *timer = NULL;
131
132         list_for_each_entry(timer, &snd_timer_list, device_list) {
133                 if (timer->tmr_class != tid->dev_class)
134                         continue;
135                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
136                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
137                     (timer->card == NULL ||
138                      timer->card->number != tid->card))
139                         continue;
140                 if (timer->tmr_device != tid->device)
141                         continue;
142                 if (timer->tmr_subdevice != tid->subdevice)
143                         continue;
144                 return timer;
145         }
146         return NULL;
147 }
148
149 #ifdef CONFIG_MODULES
150
151 static void snd_timer_request(struct snd_timer_id *tid)
152 {
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_MODULES
263         if (!timer) {
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         if (snd_BUG_ON(!timeri))
310                 return -ENXIO;
311
312         /* force to stop the timer */
313         snd_timer_stop(timeri);
314
315         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
316                 /* wait, until the active callback is finished */
317                 spin_lock_irq(&slave_active_lock);
318                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
319                         spin_unlock_irq(&slave_active_lock);
320                         udelay(10);
321                         spin_lock_irq(&slave_active_lock);
322                 }
323                 spin_unlock_irq(&slave_active_lock);
324                 mutex_lock(&register_mutex);
325                 list_del(&timeri->open_list);
326                 mutex_unlock(&register_mutex);
327         } else {
328                 timer = timeri->timer;
329                 /* wait, until the active callback is finished */
330                 spin_lock_irq(&timer->lock);
331                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
332                         spin_unlock_irq(&timer->lock);
333                         udelay(10);
334                         spin_lock_irq(&timer->lock);
335                 }
336                 spin_unlock_irq(&timer->lock);
337                 mutex_lock(&register_mutex);
338                 list_del(&timeri->open_list);
339                 if (timer && list_empty(&timer->open_list_head) &&
340                     timer->hw.close)
341                         timer->hw.close(timer);
342                 /* remove slave links */
343                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
344                                          open_list) {
345                         spin_lock_irq(&slave_active_lock);
346                         _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
347                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
348                         slave->master = NULL;
349                         slave->timer = NULL;
350                         spin_unlock_irq(&slave_active_lock);
351                 }
352                 mutex_unlock(&register_mutex);
353         }
354         if (timeri->private_free)
355                 timeri->private_free(timeri);
356         kfree(timeri->owner);
357         kfree(timeri);
358         if (timer)
359                 module_put(timer->module);
360         return 0;
361 }
362
363 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
364 {
365         struct snd_timer * timer;
366
367         if (timeri == NULL)
368                 return 0;
369         if ((timer = timeri->timer) != NULL) {
370                 if (timer->hw.c_resolution)
371                         return timer->hw.c_resolution(timer);
372                 return timer->hw.resolution;
373         }
374         return 0;
375 }
376
377 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
378 {
379         struct snd_timer *timer;
380         unsigned long flags;
381         unsigned long resolution = 0;
382         struct snd_timer_instance *ts;
383         struct timespec tstamp;
384
385         if (timer_tstamp_monotonic)
386                 do_posix_clock_monotonic_gettime(&tstamp);
387         else
388                 getnstimeofday(&tstamp);
389         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
390                        event > SNDRV_TIMER_EVENT_PAUSE))
391                 return;
392         if (event == SNDRV_TIMER_EVENT_START ||
393             event == SNDRV_TIMER_EVENT_CONTINUE)
394                 resolution = snd_timer_resolution(ti);
395         if (ti->ccallback)
396                 ti->ccallback(ti, event, &tstamp, resolution);
397         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
398                 return;
399         timer = ti->timer;
400         if (timer == NULL)
401                 return;
402         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
403                 return;
404         spin_lock_irqsave(&timer->lock, flags);
405         list_for_each_entry(ts, &ti->slave_active_head, active_list)
406                 if (ts->ccallback)
407                         ts->ccallback(ti, event + 100, &tstamp, resolution);
408         spin_unlock_irqrestore(&timer->lock, flags);
409 }
410
411 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
412                             unsigned long sticks)
413 {
414         list_del(&timeri->active_list);
415         list_add_tail(&timeri->active_list, &timer->active_list_head);
416         if (timer->running) {
417                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
418                         goto __start_now;
419                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
420                 timeri->flags |= SNDRV_TIMER_IFLG_START;
421                 return 1;       /* delayed start */
422         } else {
423                 timer->sticks = sticks;
424                 timer->hw.start(timer);
425               __start_now:
426                 timer->running++;
427                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
428                 return 0;
429         }
430 }
431
432 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
433 {
434         unsigned long flags;
435
436         spin_lock_irqsave(&slave_active_lock, flags);
437         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
438         if (timeri->master)
439                 list_add_tail(&timeri->active_list,
440                               &timeri->master->slave_active_head);
441         spin_unlock_irqrestore(&slave_active_lock, flags);
442         return 1; /* delayed start */
443 }
444
445 /*
446  *  start the timer instance
447  */
448 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
449 {
450         struct snd_timer *timer;
451         int result = -EINVAL;
452         unsigned long flags;
453
454         if (timeri == NULL || ticks < 1)
455                 return -EINVAL;
456         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
457                 result = snd_timer_start_slave(timeri);
458                 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
459                 return result;
460         }
461         timer = timeri->timer;
462         if (timer == NULL)
463                 return -EINVAL;
464         spin_lock_irqsave(&timer->lock, flags);
465         timeri->ticks = timeri->cticks = ticks;
466         timeri->pticks = 0;
467         result = snd_timer_start1(timer, timeri, ticks);
468         spin_unlock_irqrestore(&timer->lock, flags);
469         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
470         return result;
471 }
472
473 static int _snd_timer_stop(struct snd_timer_instance * timeri,
474                            int keep_flag, int event)
475 {
476         struct snd_timer *timer;
477         unsigned long flags;
478
479         if (snd_BUG_ON(!timeri))
480                 return -ENXIO;
481
482         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
483                 if (!keep_flag) {
484                         spin_lock_irqsave(&slave_active_lock, flags);
485                         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
486                         spin_unlock_irqrestore(&slave_active_lock, flags);
487                 }
488                 goto __end;
489         }
490         timer = timeri->timer;
491         if (!timer)
492                 return -EINVAL;
493         spin_lock_irqsave(&timer->lock, flags);
494         list_del_init(&timeri->ack_list);
495         list_del_init(&timeri->active_list);
496         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
497             !(--timer->running)) {
498                 timer->hw.stop(timer);
499                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
500                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
501                         snd_timer_reschedule(timer, 0);
502                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
503                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
504                                 timer->hw.start(timer);
505                         }
506                 }
507         }
508         if (!keep_flag)
509                 timeri->flags &=
510                         ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
511         spin_unlock_irqrestore(&timer->lock, flags);
512       __end:
513         if (event != SNDRV_TIMER_EVENT_RESOLUTION)
514                 snd_timer_notify1(timeri, event);
515         return 0;
516 }
517
518 /*
519  * stop the timer instance.
520  *
521  * do not call this from the timer callback!
522  */
523 int snd_timer_stop(struct snd_timer_instance *timeri)
524 {
525         struct snd_timer *timer;
526         unsigned long flags;
527         int err;
528
529         err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
530         if (err < 0)
531                 return err;
532         timer = timeri->timer;
533         spin_lock_irqsave(&timer->lock, flags);
534         timeri->cticks = timeri->ticks;
535         timeri->pticks = 0;
536         spin_unlock_irqrestore(&timer->lock, flags);
537         return 0;
538 }
539
540 /*
541  * start again..  the tick is kept.
542  */
543 int snd_timer_continue(struct snd_timer_instance *timeri)
544 {
545         struct snd_timer *timer;
546         int result = -EINVAL;
547         unsigned long flags;
548
549         if (timeri == NULL)
550                 return result;
551         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
552                 return snd_timer_start_slave(timeri);
553         timer = timeri->timer;
554         if (! timer)
555                 return -EINVAL;
556         spin_lock_irqsave(&timer->lock, flags);
557         if (!timeri->cticks)
558                 timeri->cticks = 1;
559         timeri->pticks = 0;
560         result = snd_timer_start1(timer, timeri, timer->sticks);
561         spin_unlock_irqrestore(&timer->lock, flags);
562         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
563         return result;
564 }
565
566 /*
567  * pause.. remember the ticks left
568  */
569 int snd_timer_pause(struct snd_timer_instance * timeri)
570 {
571         return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
572 }
573
574 /*
575  * reschedule the timer
576  *
577  * start pending instances and check the scheduling ticks.
578  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
579  */
580 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
581 {
582         struct snd_timer_instance *ti;
583         unsigned long ticks = ~0UL;
584
585         list_for_each_entry(ti, &timer->active_list_head, active_list) {
586                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
587                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
588                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
589                         timer->running++;
590                 }
591                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
592                         if (ticks > ti->cticks)
593                                 ticks = ti->cticks;
594                 }
595         }
596         if (ticks == ~0UL) {
597                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
598                 return;
599         }
600         if (ticks > timer->hw.ticks)
601                 ticks = timer->hw.ticks;
602         if (ticks_left != ticks)
603                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
604         timer->sticks = ticks;
605 }
606
607 /*
608  * timer tasklet
609  *
610  */
611 static void snd_timer_tasklet(unsigned long arg)
612 {
613         struct snd_timer *timer = (struct snd_timer *) arg;
614         struct snd_timer_instance *ti;
615         struct list_head *p;
616         unsigned long resolution, ticks;
617         unsigned long flags;
618
619         spin_lock_irqsave(&timer->lock, flags);
620         /* now process all callbacks */
621         while (!list_empty(&timer->sack_list_head)) {
622                 p = timer->sack_list_head.next;         /* get first item */
623                 ti = list_entry(p, struct snd_timer_instance, ack_list);
624
625                 /* remove from ack_list and make empty */
626                 list_del_init(p);
627
628                 ticks = ti->pticks;
629                 ti->pticks = 0;
630                 resolution = ti->resolution;
631
632                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
633                 spin_unlock(&timer->lock);
634                 if (ti->callback)
635                         ti->callback(ti, resolution, ticks);
636                 spin_lock(&timer->lock);
637                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
638         }
639         spin_unlock_irqrestore(&timer->lock, flags);
640 }
641
642 /*
643  * timer interrupt
644  *
645  * ticks_left is usually equal to timer->sticks.
646  *
647  */
648 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
649 {
650         struct snd_timer_instance *ti, *ts, *tmp;
651         unsigned long resolution, ticks;
652         struct list_head *p, *ack_list_head;
653         unsigned long flags;
654         int use_tasklet = 0;
655
656         if (timer == NULL)
657                 return;
658
659         spin_lock_irqsave(&timer->lock, flags);
660
661         /* remember the current resolution */
662         if (timer->hw.c_resolution)
663                 resolution = timer->hw.c_resolution(timer);
664         else
665                 resolution = timer->hw.resolution;
666
667         /* loop for all active instances
668          * Here we cannot use list_for_each_entry because the active_list of a
669          * processed instance is relinked to done_list_head before the callback
670          * is called.
671          */
672         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
673                                  active_list) {
674                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
675                         continue;
676                 ti->pticks += ticks_left;
677                 ti->resolution = resolution;
678                 if (ti->cticks < ticks_left)
679                         ti->cticks = 0;
680                 else
681                         ti->cticks -= ticks_left;
682                 if (ti->cticks) /* not expired */
683                         continue;
684                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
685                         ti->cticks = ti->ticks;
686                 } else {
687                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
688                         if (--timer->running)
689                                 list_del(&ti->active_list);
690                 }
691                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
692                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
693                         ack_list_head = &timer->ack_list_head;
694                 else
695                         ack_list_head = &timer->sack_list_head;
696                 if (list_empty(&ti->ack_list))
697                         list_add_tail(&ti->ack_list, ack_list_head);
698                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
699                         ts->pticks = ti->pticks;
700                         ts->resolution = resolution;
701                         if (list_empty(&ts->ack_list))
702                                 list_add_tail(&ts->ack_list, ack_list_head);
703                 }
704         }
705         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
706                 snd_timer_reschedule(timer, timer->sticks);
707         if (timer->running) {
708                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
709                         timer->hw.stop(timer);
710                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
711                 }
712                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
713                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
714                         /* restart timer */
715                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
716                         timer->hw.start(timer);
717                 }
718         } else {
719                 timer->hw.stop(timer);
720         }
721
722         /* now process all fast callbacks */
723         while (!list_empty(&timer->ack_list_head)) {
724                 p = timer->ack_list_head.next;          /* get first item */
725                 ti = list_entry(p, struct snd_timer_instance, ack_list);
726
727                 /* remove from ack_list and make empty */
728                 list_del_init(p);
729
730                 ticks = ti->pticks;
731                 ti->pticks = 0;
732
733                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
734                 spin_unlock(&timer->lock);
735                 if (ti->callback)
736                         ti->callback(ti, resolution, ticks);
737                 spin_lock(&timer->lock);
738                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
739         }
740
741         /* do we have any slow callbacks? */
742         use_tasklet = !list_empty(&timer->sack_list_head);
743         spin_unlock_irqrestore(&timer->lock, flags);
744
745         if (use_tasklet)
746                 tasklet_schedule(&timer->task_queue);
747 }
748
749 /*
750
751  */
752
753 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
754                   struct snd_timer **rtimer)
755 {
756         struct snd_timer *timer;
757         int err;
758         static struct snd_device_ops ops = {
759                 .dev_free = snd_timer_dev_free,
760                 .dev_register = snd_timer_dev_register,
761                 .dev_disconnect = snd_timer_dev_disconnect,
762         };
763
764         if (snd_BUG_ON(!tid))
765                 return -EINVAL;
766         if (rtimer)
767                 *rtimer = NULL;
768         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
769         if (timer == NULL) {
770                 snd_printk(KERN_ERR "timer: cannot allocate\n");
771                 return -ENOMEM;
772         }
773         timer->tmr_class = tid->dev_class;
774         timer->card = card;
775         timer->tmr_device = tid->device;
776         timer->tmr_subdevice = tid->subdevice;
777         if (id)
778                 strlcpy(timer->id, id, sizeof(timer->id));
779         INIT_LIST_HEAD(&timer->device_list);
780         INIT_LIST_HEAD(&timer->open_list_head);
781         INIT_LIST_HEAD(&timer->active_list_head);
782         INIT_LIST_HEAD(&timer->ack_list_head);
783         INIT_LIST_HEAD(&timer->sack_list_head);
784         spin_lock_init(&timer->lock);
785         tasklet_init(&timer->task_queue, snd_timer_tasklet,
786                      (unsigned long)timer);
787         if (card != NULL) {
788                 timer->module = card->module;
789                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
790                 if (err < 0) {
791                         snd_timer_free(timer);
792                         return err;
793                 }
794         }
795         if (rtimer)
796                 *rtimer = timer;
797         return 0;
798 }
799
800 static int snd_timer_free(struct snd_timer *timer)
801 {
802         if (!timer)
803                 return 0;
804
805         mutex_lock(&register_mutex);
806         if (! list_empty(&timer->open_list_head)) {
807                 struct list_head *p, *n;
808                 struct snd_timer_instance *ti;
809                 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
810                 list_for_each_safe(p, n, &timer->open_list_head) {
811                         list_del_init(p);
812                         ti = list_entry(p, struct snd_timer_instance, open_list);
813                         ti->timer = NULL;
814                 }
815         }
816         list_del(&timer->device_list);
817         mutex_unlock(&register_mutex);
818
819         if (timer->private_free)
820                 timer->private_free(timer);
821         kfree(timer);
822         return 0;
823 }
824
825 static int snd_timer_dev_free(struct snd_device *device)
826 {
827         struct snd_timer *timer = device->device_data;
828         return snd_timer_free(timer);
829 }
830
831 static int snd_timer_dev_register(struct snd_device *dev)
832 {
833         struct snd_timer *timer = dev->device_data;
834         struct snd_timer *timer1;
835
836         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
837                 return -ENXIO;
838         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
839             !timer->hw.resolution && timer->hw.c_resolution == NULL)
840                 return -EINVAL;
841
842         mutex_lock(&register_mutex);
843         list_for_each_entry(timer1, &snd_timer_list, device_list) {
844                 if (timer1->tmr_class > timer->tmr_class)
845                         break;
846                 if (timer1->tmr_class < timer->tmr_class)
847                         continue;
848                 if (timer1->card && timer->card) {
849                         if (timer1->card->number > timer->card->number)
850                                 break;
851                         if (timer1->card->number < timer->card->number)
852                                 continue;
853                 }
854                 if (timer1->tmr_device > timer->tmr_device)
855                         break;
856                 if (timer1->tmr_device < timer->tmr_device)
857                         continue;
858                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
859                         break;
860                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
861                         continue;
862                 /* conflicts.. */
863                 mutex_unlock(&register_mutex);
864                 return -EBUSY;
865         }
866         list_add_tail(&timer->device_list, &timer1->device_list);
867         mutex_unlock(&register_mutex);
868         return 0;
869 }
870
871 static int snd_timer_dev_disconnect(struct snd_device *device)
872 {
873         struct snd_timer *timer = device->device_data;
874         mutex_lock(&register_mutex);
875         list_del_init(&timer->device_list);
876         mutex_unlock(&register_mutex);
877         return 0;
878 }
879
880 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
881 {
882         unsigned long flags;
883         unsigned long resolution = 0;
884         struct snd_timer_instance *ti, *ts;
885
886         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
887                 return;
888         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
889                        event > SNDRV_TIMER_EVENT_MRESUME))
890                 return;
891         spin_lock_irqsave(&timer->lock, flags);
892         if (event == SNDRV_TIMER_EVENT_MSTART ||
893             event == SNDRV_TIMER_EVENT_MCONTINUE ||
894             event == SNDRV_TIMER_EVENT_MRESUME) {
895                 if (timer->hw.c_resolution)
896                         resolution = timer->hw.c_resolution(timer);
897                 else
898                         resolution = timer->hw.resolution;
899         }
900         list_for_each_entry(ti, &timer->active_list_head, active_list) {
901                 if (ti->ccallback)
902                         ti->ccallback(ti, event, tstamp, resolution);
903                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
904                         if (ts->ccallback)
905                                 ts->ccallback(ts, event, tstamp, resolution);
906         }
907         spin_unlock_irqrestore(&timer->lock, flags);
908 }
909
910 /*
911  * exported functions for global timers
912  */
913 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
914 {
915         struct snd_timer_id tid;
916
917         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
918         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
919         tid.card = -1;
920         tid.device = device;
921         tid.subdevice = 0;
922         return snd_timer_new(NULL, id, &tid, rtimer);
923 }
924
925 int snd_timer_global_free(struct snd_timer *timer)
926 {
927         return snd_timer_free(timer);
928 }
929
930 int snd_timer_global_register(struct snd_timer *timer)
931 {
932         struct snd_device dev;
933
934         memset(&dev, 0, sizeof(dev));
935         dev.device_data = timer;
936         return snd_timer_dev_register(&dev);
937 }
938
939 /*
940  *  System timer
941  */
942
943 struct snd_timer_system_private {
944         struct timer_list tlist;
945         unsigned long last_expires;
946         unsigned long last_jiffies;
947         unsigned long correction;
948 };
949
950 static void snd_timer_s_function(unsigned long data)
951 {
952         struct snd_timer *timer = (struct snd_timer *)data;
953         struct snd_timer_system_private *priv = timer->private_data;
954         unsigned long jiff = jiffies;
955         if (time_after(jiff, priv->last_expires))
956                 priv->correction += (long)jiff - (long)priv->last_expires;
957         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
958 }
959
960 static int snd_timer_s_start(struct snd_timer * timer)
961 {
962         struct snd_timer_system_private *priv;
963         unsigned long njiff;
964
965         priv = (struct snd_timer_system_private *) timer->private_data;
966         njiff = (priv->last_jiffies = jiffies);
967         if (priv->correction > timer->sticks - 1) {
968                 priv->correction -= timer->sticks - 1;
969                 njiff++;
970         } else {
971                 njiff += timer->sticks - priv->correction;
972                 priv->correction = 0;
973         }
974         priv->last_expires = priv->tlist.expires = njiff;
975         add_timer(&priv->tlist);
976         return 0;
977 }
978
979 static int snd_timer_s_stop(struct snd_timer * timer)
980 {
981         struct snd_timer_system_private *priv;
982         unsigned long jiff;
983
984         priv = (struct snd_timer_system_private *) timer->private_data;
985         del_timer(&priv->tlist);
986         jiff = jiffies;
987         if (time_before(jiff, priv->last_expires))
988                 timer->sticks = priv->last_expires - jiff;
989         else
990                 timer->sticks = 1;
991         priv->correction = 0;
992         return 0;
993 }
994
995 static struct snd_timer_hardware snd_timer_system =
996 {
997         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
998         .resolution =   1000000000L / HZ,
999         .ticks =        10000000L,
1000         .start =        snd_timer_s_start,
1001         .stop =         snd_timer_s_stop
1002 };
1003
1004 static void snd_timer_free_system(struct snd_timer *timer)
1005 {
1006         kfree(timer->private_data);
1007 }
1008
1009 static int snd_timer_register_system(void)
1010 {
1011         struct snd_timer *timer;
1012         struct snd_timer_system_private *priv;
1013         int err;
1014
1015         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1016         if (err < 0)
1017                 return err;
1018         strcpy(timer->name, "system timer");
1019         timer->hw = snd_timer_system;
1020         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1021         if (priv == NULL) {
1022                 snd_timer_free(timer);
1023                 return -ENOMEM;
1024         }
1025         init_timer(&priv->tlist);
1026         priv->tlist.function = snd_timer_s_function;
1027         priv->tlist.data = (unsigned long) timer;
1028         timer->private_data = priv;
1029         timer->private_free = snd_timer_free_system;
1030         return snd_timer_global_register(timer);
1031 }
1032
1033 #ifdef CONFIG_PROC_FS
1034 /*
1035  *  Info interface
1036  */
1037
1038 static void snd_timer_proc_read(struct snd_info_entry *entry,
1039                                 struct snd_info_buffer *buffer)
1040 {
1041         struct snd_timer *timer;
1042         struct snd_timer_instance *ti;
1043
1044         mutex_lock(&register_mutex);
1045         list_for_each_entry(timer, &snd_timer_list, device_list) {
1046                 switch (timer->tmr_class) {
1047                 case SNDRV_TIMER_CLASS_GLOBAL:
1048                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1049                         break;
1050                 case SNDRV_TIMER_CLASS_CARD:
1051                         snd_iprintf(buffer, "C%i-%i: ",
1052                                     timer->card->number, timer->tmr_device);
1053                         break;
1054                 case SNDRV_TIMER_CLASS_PCM:
1055                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1056                                     timer->tmr_device, timer->tmr_subdevice);
1057                         break;
1058                 default:
1059                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1060                                     timer->card ? timer->card->number : -1,
1061                                     timer->tmr_device, timer->tmr_subdevice);
1062                 }
1063                 snd_iprintf(buffer, "%s :", timer->name);
1064                 if (timer->hw.resolution)
1065                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1066                                     timer->hw.resolution / 1000,
1067                                     timer->hw.resolution % 1000,
1068                                     timer->hw.ticks);
1069                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1070                         snd_iprintf(buffer, " SLAVE");
1071                 snd_iprintf(buffer, "\n");
1072                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1073                         snd_iprintf(buffer, "  Client %s : %s\n",
1074                                     ti->owner ? ti->owner : "unknown",
1075                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1076                                                  SNDRV_TIMER_IFLG_RUNNING)
1077                                     ? "running" : "stopped");
1078         }
1079         mutex_unlock(&register_mutex);
1080 }
1081
1082 static struct snd_info_entry *snd_timer_proc_entry;
1083
1084 static void __init snd_timer_proc_init(void)
1085 {
1086         struct snd_info_entry *entry;
1087
1088         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1089         if (entry != NULL) {
1090                 entry->c.text.read = snd_timer_proc_read;
1091                 if (snd_info_register(entry) < 0) {
1092                         snd_info_free_entry(entry);
1093                         entry = NULL;
1094                 }
1095         }
1096         snd_timer_proc_entry = entry;
1097 }
1098
1099 static void __exit snd_timer_proc_done(void)
1100 {
1101         snd_info_free_entry(snd_timer_proc_entry);
1102 }
1103 #else /* !CONFIG_PROC_FS */
1104 #define snd_timer_proc_init()
1105 #define snd_timer_proc_done()
1106 #endif
1107
1108 /*
1109  *  USER SPACE interface
1110  */
1111
1112 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1113                                      unsigned long resolution,
1114                                      unsigned long ticks)
1115 {
1116         struct snd_timer_user *tu = timeri->callback_data;
1117         struct snd_timer_read *r;
1118         int prev;
1119
1120         spin_lock(&tu->qlock);
1121         if (tu->qused > 0) {
1122                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1123                 r = &tu->queue[prev];
1124                 if (r->resolution == resolution) {
1125                         r->ticks += ticks;
1126                         goto __wake;
1127                 }
1128         }
1129         if (tu->qused >= tu->queue_size) {
1130                 tu->overrun++;
1131         } else {
1132                 r = &tu->queue[tu->qtail++];
1133                 tu->qtail %= tu->queue_size;
1134                 r->resolution = resolution;
1135                 r->ticks = ticks;
1136                 tu->qused++;
1137         }
1138       __wake:
1139         spin_unlock(&tu->qlock);
1140         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1141         wake_up(&tu->qchange_sleep);
1142 }
1143
1144 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1145                                             struct snd_timer_tread *tread)
1146 {
1147         if (tu->qused >= tu->queue_size) {
1148                 tu->overrun++;
1149         } else {
1150                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1151                 tu->qtail %= tu->queue_size;
1152                 tu->qused++;
1153         }
1154 }
1155
1156 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1157                                      int event,
1158                                      struct timespec *tstamp,
1159                                      unsigned long resolution)
1160 {
1161         struct snd_timer_user *tu = timeri->callback_data;
1162         struct snd_timer_tread r1;
1163         unsigned long flags;
1164
1165         if (event >= SNDRV_TIMER_EVENT_START &&
1166             event <= SNDRV_TIMER_EVENT_PAUSE)
1167                 tu->tstamp = *tstamp;
1168         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1169                 return;
1170         r1.event = event;
1171         r1.tstamp = *tstamp;
1172         r1.val = resolution;
1173         spin_lock_irqsave(&tu->qlock, flags);
1174         snd_timer_user_append_to_tqueue(tu, &r1);
1175         spin_unlock_irqrestore(&tu->qlock, flags);
1176         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1177         wake_up(&tu->qchange_sleep);
1178 }
1179
1180 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1181                                       unsigned long resolution,
1182                                       unsigned long ticks)
1183 {
1184         struct snd_timer_user *tu = timeri->callback_data;
1185         struct snd_timer_tread *r, r1;
1186         struct timespec tstamp;
1187         int prev, append = 0;
1188
1189         memset(&tstamp, 0, sizeof(tstamp));
1190         spin_lock(&tu->qlock);
1191         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1192                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1193                 spin_unlock(&tu->qlock);
1194                 return;
1195         }
1196         if (tu->last_resolution != resolution || ticks > 0) {
1197                 if (timer_tstamp_monotonic)
1198                         do_posix_clock_monotonic_gettime(&tstamp);
1199                 else
1200                         getnstimeofday(&tstamp);
1201         }
1202         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1203             tu->last_resolution != resolution) {
1204                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1205                 r1.tstamp = tstamp;
1206                 r1.val = resolution;
1207                 snd_timer_user_append_to_tqueue(tu, &r1);
1208                 tu->last_resolution = resolution;
1209                 append++;
1210         }
1211         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1212                 goto __wake;
1213         if (ticks == 0)
1214                 goto __wake;
1215         if (tu->qused > 0) {
1216                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1217                 r = &tu->tqueue[prev];
1218                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1219                         r->tstamp = tstamp;
1220                         r->val += ticks;
1221                         append++;
1222                         goto __wake;
1223                 }
1224         }
1225         r1.event = SNDRV_TIMER_EVENT_TICK;
1226         r1.tstamp = tstamp;
1227         r1.val = ticks;
1228         snd_timer_user_append_to_tqueue(tu, &r1);
1229         append++;
1230       __wake:
1231         spin_unlock(&tu->qlock);
1232         if (append == 0)
1233                 return;
1234         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1235         wake_up(&tu->qchange_sleep);
1236 }
1237
1238 static int snd_timer_user_open(struct inode *inode, struct file *file)
1239 {
1240         struct snd_timer_user *tu;
1241
1242         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1243         if (tu == NULL)
1244                 return -ENOMEM;
1245         spin_lock_init(&tu->qlock);
1246         init_waitqueue_head(&tu->qchange_sleep);
1247         mutex_init(&tu->tread_sem);
1248         tu->ticks = 1;
1249         tu->queue_size = 128;
1250         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1251                             GFP_KERNEL);
1252         if (tu->queue == NULL) {
1253                 kfree(tu);
1254                 return -ENOMEM;
1255         }
1256         file->private_data = tu;
1257         return 0;
1258 }
1259
1260 static int snd_timer_user_release(struct inode *inode, struct file *file)
1261 {
1262         struct snd_timer_user *tu;
1263
1264         if (file->private_data) {
1265                 tu = file->private_data;
1266                 file->private_data = NULL;
1267                 if (tu->timeri)
1268                         snd_timer_close(tu->timeri);
1269                 kfree(tu->queue);
1270                 kfree(tu->tqueue);
1271                 kfree(tu);
1272         }
1273         return 0;
1274 }
1275
1276 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1277 {
1278         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1279         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1280         id->card = -1;
1281         id->device = -1;
1282         id->subdevice = -1;
1283 }
1284
1285 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1286 {
1287         id->dev_class = timer->tmr_class;
1288         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1289         id->card = timer->card ? timer->card->number : -1;
1290         id->device = timer->tmr_device;
1291         id->subdevice = timer->tmr_subdevice;
1292 }
1293
1294 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1295 {
1296         struct snd_timer_id id;
1297         struct snd_timer *timer;
1298         struct list_head *p;
1299
1300         if (copy_from_user(&id, _tid, sizeof(id)))
1301                 return -EFAULT;
1302         mutex_lock(&register_mutex);
1303         if (id.dev_class < 0) {         /* first item */
1304                 if (list_empty(&snd_timer_list))
1305                         snd_timer_user_zero_id(&id);
1306                 else {
1307                         timer = list_entry(snd_timer_list.next,
1308                                            struct snd_timer, device_list);
1309                         snd_timer_user_copy_id(&id, timer);
1310                 }
1311         } else {
1312                 switch (id.dev_class) {
1313                 case SNDRV_TIMER_CLASS_GLOBAL:
1314                         id.device = id.device < 0 ? 0 : id.device + 1;
1315                         list_for_each(p, &snd_timer_list) {
1316                                 timer = list_entry(p, struct snd_timer, device_list);
1317                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1318                                         snd_timer_user_copy_id(&id, timer);
1319                                         break;
1320                                 }
1321                                 if (timer->tmr_device >= id.device) {
1322                                         snd_timer_user_copy_id(&id, timer);
1323                                         break;
1324                                 }
1325                         }
1326                         if (p == &snd_timer_list)
1327                                 snd_timer_user_zero_id(&id);
1328                         break;
1329                 case SNDRV_TIMER_CLASS_CARD:
1330                 case SNDRV_TIMER_CLASS_PCM:
1331                         if (id.card < 0) {
1332                                 id.card = 0;
1333                         } else {
1334                                 if (id.card < 0) {
1335                                         id.card = 0;
1336                                 } else {
1337                                         if (id.device < 0) {
1338                                                 id.device = 0;
1339                                         } else {
1340                                                 if (id.subdevice < 0) {
1341                                                         id.subdevice = 0;
1342                                                 } else {
1343                                                         id.subdevice++;
1344                                                 }
1345                                         }
1346                                 }
1347                         }
1348                         list_for_each(p, &snd_timer_list) {
1349                                 timer = list_entry(p, struct snd_timer, device_list);
1350                                 if (timer->tmr_class > id.dev_class) {
1351                                         snd_timer_user_copy_id(&id, timer);
1352                                         break;
1353                                 }
1354                                 if (timer->tmr_class < id.dev_class)
1355                                         continue;
1356                                 if (timer->card->number > id.card) {
1357                                         snd_timer_user_copy_id(&id, timer);
1358                                         break;
1359                                 }
1360                                 if (timer->card->number < id.card)
1361                                         continue;
1362                                 if (timer->tmr_device > id.device) {
1363                                         snd_timer_user_copy_id(&id, timer);
1364                                         break;
1365                                 }
1366                                 if (timer->tmr_device < id.device)
1367                                         continue;
1368                                 if (timer->tmr_subdevice > id.subdevice) {
1369                                         snd_timer_user_copy_id(&id, timer);
1370                                         break;
1371                                 }
1372                                 if (timer->tmr_subdevice < id.subdevice)
1373                                         continue;
1374                                 snd_timer_user_copy_id(&id, timer);
1375                                 break;
1376                         }
1377                         if (p == &snd_timer_list)
1378                                 snd_timer_user_zero_id(&id);
1379                         break;
1380                 default:
1381                         snd_timer_user_zero_id(&id);
1382                 }
1383         }
1384         mutex_unlock(&register_mutex);
1385         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1386                 return -EFAULT;
1387         return 0;
1388 }
1389
1390 static int snd_timer_user_ginfo(struct file *file,
1391                                 struct snd_timer_ginfo __user *_ginfo)
1392 {
1393         struct snd_timer_ginfo *ginfo;
1394         struct snd_timer_id tid;
1395         struct snd_timer *t;
1396         struct list_head *p;
1397         int err = 0;
1398
1399         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1400         if (IS_ERR(ginfo))
1401                 return PTR_ERR(ginfo);
1402
1403         tid = ginfo->tid;
1404         memset(ginfo, 0, sizeof(*ginfo));
1405         ginfo->tid = tid;
1406         mutex_lock(&register_mutex);
1407         t = snd_timer_find(&tid);
1408         if (t != NULL) {
1409                 ginfo->card = t->card ? t->card->number : -1;
1410                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1411                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1412                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1413                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1414                 ginfo->resolution = t->hw.resolution;
1415                 if (t->hw.resolution_min > 0) {
1416                         ginfo->resolution_min = t->hw.resolution_min;
1417                         ginfo->resolution_max = t->hw.resolution_max;
1418                 }
1419                 list_for_each(p, &t->open_list_head) {
1420                         ginfo->clients++;
1421                 }
1422         } else {
1423                 err = -ENODEV;
1424         }
1425         mutex_unlock(&register_mutex);
1426         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1427                 err = -EFAULT;
1428         kfree(ginfo);
1429         return err;
1430 }
1431
1432 static int snd_timer_user_gparams(struct file *file,
1433                                   struct snd_timer_gparams __user *_gparams)
1434 {
1435         struct snd_timer_gparams gparams;
1436         struct snd_timer *t;
1437         int err;
1438
1439         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1440                 return -EFAULT;
1441         mutex_lock(&register_mutex);
1442         t = snd_timer_find(&gparams.tid);
1443         if (!t) {
1444                 err = -ENODEV;
1445                 goto _error;
1446         }
1447         if (!list_empty(&t->open_list_head)) {
1448                 err = -EBUSY;
1449                 goto _error;
1450         }
1451         if (!t->hw.set_period) {
1452                 err = -ENOSYS;
1453                 goto _error;
1454         }
1455         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1456 _error:
1457         mutex_unlock(&register_mutex);
1458         return err;
1459 }
1460
1461 static int snd_timer_user_gstatus(struct file *file,
1462                                   struct snd_timer_gstatus __user *_gstatus)
1463 {
1464         struct snd_timer_gstatus gstatus;
1465         struct snd_timer_id tid;
1466         struct snd_timer *t;
1467         int err = 0;
1468
1469         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1470                 return -EFAULT;
1471         tid = gstatus.tid;
1472         memset(&gstatus, 0, sizeof(gstatus));
1473         gstatus.tid = tid;
1474         mutex_lock(&register_mutex);
1475         t = snd_timer_find(&tid);
1476         if (t != NULL) {
1477                 if (t->hw.c_resolution)
1478                         gstatus.resolution = t->hw.c_resolution(t);
1479                 else
1480                         gstatus.resolution = t->hw.resolution;
1481                 if (t->hw.precise_resolution) {
1482                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1483                                                  &gstatus.resolution_den);
1484                 } else {
1485                         gstatus.resolution_num = gstatus.resolution;
1486                         gstatus.resolution_den = 1000000000uL;
1487                 }
1488         } else {
1489                 err = -ENODEV;
1490         }
1491         mutex_unlock(&register_mutex);
1492         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1493                 err = -EFAULT;
1494         return err;
1495 }
1496
1497 static int snd_timer_user_tselect(struct file *file,
1498                                   struct snd_timer_select __user *_tselect)
1499 {
1500         struct snd_timer_user *tu;
1501         struct snd_timer_select tselect;
1502         char str[32];
1503         int err = 0;
1504
1505         tu = file->private_data;
1506         mutex_lock(&tu->tread_sem);
1507         if (tu->timeri) {
1508                 snd_timer_close(tu->timeri);
1509                 tu->timeri = NULL;
1510         }
1511         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1512                 err = -EFAULT;
1513                 goto __err;
1514         }
1515         sprintf(str, "application %i", current->pid);
1516         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1517                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1518         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1519         if (err < 0)
1520                 goto __err;
1521
1522         kfree(tu->queue);
1523         tu->queue = NULL;
1524         kfree(tu->tqueue);
1525         tu->tqueue = NULL;
1526         if (tu->tread) {
1527                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1528                                      GFP_KERNEL);
1529                 if (tu->tqueue == NULL)
1530                         err = -ENOMEM;
1531         } else {
1532                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1533                                     GFP_KERNEL);
1534                 if (tu->queue == NULL)
1535                         err = -ENOMEM;
1536         }
1537
1538         if (err < 0) {
1539                 snd_timer_close(tu->timeri);
1540                 tu->timeri = NULL;
1541         } else {
1542                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1543                 tu->timeri->callback = tu->tread
1544                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1545                 tu->timeri->ccallback = snd_timer_user_ccallback;
1546                 tu->timeri->callback_data = (void *)tu;
1547         }
1548
1549       __err:
1550         mutex_unlock(&tu->tread_sem);
1551         return err;
1552 }
1553
1554 static int snd_timer_user_info(struct file *file,
1555                                struct snd_timer_info __user *_info)
1556 {
1557         struct snd_timer_user *tu;
1558         struct snd_timer_info *info;
1559         struct snd_timer *t;
1560         int err = 0;
1561
1562         tu = file->private_data;
1563         if (!tu->timeri)
1564                 return -EBADFD;
1565         t = tu->timeri->timer;
1566         if (!t)
1567                 return -EBADFD;
1568
1569         info = kzalloc(sizeof(*info), GFP_KERNEL);
1570         if (! info)
1571                 return -ENOMEM;
1572         info->card = t->card ? t->card->number : -1;
1573         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1574                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1575         strlcpy(info->id, t->id, sizeof(info->id));
1576         strlcpy(info->name, t->name, sizeof(info->name));
1577         info->resolution = t->hw.resolution;
1578         if (copy_to_user(_info, info, sizeof(*_info)))
1579                 err = -EFAULT;
1580         kfree(info);
1581         return err;
1582 }
1583
1584 static int snd_timer_user_params(struct file *file,
1585                                  struct snd_timer_params __user *_params)
1586 {
1587         struct snd_timer_user *tu;
1588         struct snd_timer_params params;
1589         struct snd_timer *t;
1590         struct snd_timer_read *tr;
1591         struct snd_timer_tread *ttr;
1592         int err;
1593
1594         tu = file->private_data;
1595         if (!tu->timeri)
1596                 return -EBADFD;
1597         t = tu->timeri->timer;
1598         if (!t)
1599                 return -EBADFD;
1600         if (copy_from_user(&params, _params, sizeof(params)))
1601                 return -EFAULT;
1602         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1603                 err = -EINVAL;
1604                 goto _end;
1605         }
1606         if (params.queue_size > 0 &&
1607             (params.queue_size < 32 || params.queue_size > 1024)) {
1608                 err = -EINVAL;
1609                 goto _end;
1610         }
1611         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1612                               (1<<SNDRV_TIMER_EVENT_TICK)|
1613                               (1<<SNDRV_TIMER_EVENT_START)|
1614                               (1<<SNDRV_TIMER_EVENT_STOP)|
1615                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1616                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1617                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1618                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1619                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1620                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1621                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1622                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1623                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1624                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1625                 err = -EINVAL;
1626                 goto _end;
1627         }
1628         snd_timer_stop(tu->timeri);
1629         spin_lock_irq(&t->lock);
1630         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1631                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1632                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1633         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1634                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1635         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1636                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1637         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1638                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1639         spin_unlock_irq(&t->lock);
1640         if (params.queue_size > 0 &&
1641             (unsigned int)tu->queue_size != params.queue_size) {
1642                 if (tu->tread) {
1643                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1644                                       GFP_KERNEL);
1645                         if (ttr) {
1646                                 kfree(tu->tqueue);
1647                                 tu->queue_size = params.queue_size;
1648                                 tu->tqueue = ttr;
1649                         }
1650                 } else {
1651                         tr = kmalloc(params.queue_size * sizeof(*tr),
1652                                      GFP_KERNEL);
1653                         if (tr) {
1654                                 kfree(tu->queue);
1655                                 tu->queue_size = params.queue_size;
1656                                 tu->queue = tr;
1657                         }
1658                 }
1659         }
1660         tu->qhead = tu->qtail = tu->qused = 0;
1661         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1662                 if (tu->tread) {
1663                         struct snd_timer_tread tread;
1664                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1665                         tread.tstamp.tv_sec = 0;
1666                         tread.tstamp.tv_nsec = 0;
1667                         tread.val = 0;
1668                         snd_timer_user_append_to_tqueue(tu, &tread);
1669                 } else {
1670                         struct snd_timer_read *r = &tu->queue[0];
1671                         r->resolution = 0;
1672                         r->ticks = 0;
1673                         tu->qused++;
1674                         tu->qtail++;
1675                 }
1676         }
1677         tu->filter = params.filter;
1678         tu->ticks = params.ticks;
1679         err = 0;
1680  _end:
1681         if (copy_to_user(_params, &params, sizeof(params)))
1682                 return -EFAULT;
1683         return err;
1684 }
1685
1686 static int snd_timer_user_status(struct file *file,
1687                                  struct snd_timer_status __user *_status)
1688 {
1689         struct snd_timer_user *tu;
1690         struct snd_timer_status status;
1691
1692         tu = file->private_data;
1693         if (!tu->timeri)
1694                 return -EBADFD;
1695         memset(&status, 0, sizeof(status));
1696         status.tstamp = tu->tstamp;
1697         status.resolution = snd_timer_resolution(tu->timeri);
1698         status.lost = tu->timeri->lost;
1699         status.overrun = tu->overrun;
1700         spin_lock_irq(&tu->qlock);
1701         status.queue = tu->qused;
1702         spin_unlock_irq(&tu->qlock);
1703         if (copy_to_user(_status, &status, sizeof(status)))
1704                 return -EFAULT;
1705         return 0;
1706 }
1707
1708 static int snd_timer_user_start(struct file *file)
1709 {
1710         int err;
1711         struct snd_timer_user *tu;
1712
1713         tu = file->private_data;
1714         if (!tu->timeri)
1715                 return -EBADFD;
1716         snd_timer_stop(tu->timeri);
1717         tu->timeri->lost = 0;
1718         tu->last_resolution = 0;
1719         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1720 }
1721
1722 static int snd_timer_user_stop(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         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1731 }
1732
1733 static int snd_timer_user_continue(struct file *file)
1734 {
1735         int err;
1736         struct snd_timer_user *tu;
1737
1738         tu = file->private_data;
1739         if (!tu->timeri)
1740                 return -EBADFD;
1741         tu->timeri->lost = 0;
1742         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1743 }
1744
1745 static int snd_timer_user_pause(struct file *file)
1746 {
1747         int err;
1748         struct snd_timer_user *tu;
1749
1750         tu = file->private_data;
1751         if (!tu->timeri)
1752                 return -EBADFD;
1753         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1754 }
1755
1756 enum {
1757         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1758         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1759         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1760         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1761 };
1762
1763 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1764                                  unsigned long arg)
1765 {
1766         struct snd_timer_user *tu;
1767         void __user *argp = (void __user *)arg;
1768         int __user *p = argp;
1769
1770         tu = file->private_data;
1771         switch (cmd) {
1772         case SNDRV_TIMER_IOCTL_PVERSION:
1773                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1774         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1775                 return snd_timer_user_next_device(argp);
1776         case SNDRV_TIMER_IOCTL_TREAD:
1777         {
1778                 int xarg;
1779
1780                 mutex_lock(&tu->tread_sem);
1781                 if (tu->timeri) {       /* too late */
1782                         mutex_unlock(&tu->tread_sem);
1783                         return -EBUSY;
1784                 }
1785                 if (get_user(xarg, p)) {
1786                         mutex_unlock(&tu->tread_sem);
1787                         return -EFAULT;
1788                 }
1789                 tu->tread = xarg ? 1 : 0;
1790                 mutex_unlock(&tu->tread_sem);
1791                 return 0;
1792         }
1793         case SNDRV_TIMER_IOCTL_GINFO:
1794                 return snd_timer_user_ginfo(file, argp);
1795         case SNDRV_TIMER_IOCTL_GPARAMS:
1796                 return snd_timer_user_gparams(file, argp);
1797         case SNDRV_TIMER_IOCTL_GSTATUS:
1798                 return snd_timer_user_gstatus(file, argp);
1799         case SNDRV_TIMER_IOCTL_SELECT:
1800                 return snd_timer_user_tselect(file, argp);
1801         case SNDRV_TIMER_IOCTL_INFO:
1802                 return snd_timer_user_info(file, argp);
1803         case SNDRV_TIMER_IOCTL_PARAMS:
1804                 return snd_timer_user_params(file, argp);
1805         case SNDRV_TIMER_IOCTL_STATUS:
1806                 return snd_timer_user_status(file, argp);
1807         case SNDRV_TIMER_IOCTL_START:
1808         case SNDRV_TIMER_IOCTL_START_OLD:
1809                 return snd_timer_user_start(file);
1810         case SNDRV_TIMER_IOCTL_STOP:
1811         case SNDRV_TIMER_IOCTL_STOP_OLD:
1812                 return snd_timer_user_stop(file);
1813         case SNDRV_TIMER_IOCTL_CONTINUE:
1814         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1815                 return snd_timer_user_continue(file);
1816         case SNDRV_TIMER_IOCTL_PAUSE:
1817         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1818                 return snd_timer_user_pause(file);
1819         }
1820         return -ENOTTY;
1821 }
1822
1823 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1824 {
1825         struct snd_timer_user *tu;
1826
1827         tu = file->private_data;
1828         return fasync_helper(fd, file, on, &tu->fasync);
1829 }
1830
1831 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1832                                    size_t count, loff_t *offset)
1833 {
1834         struct snd_timer_user *tu;
1835         long result = 0, unit;
1836         int err = 0;
1837
1838         tu = file->private_data;
1839         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1840         spin_lock_irq(&tu->qlock);
1841         while ((long)count - result >= unit) {
1842                 while (!tu->qused) {
1843                         wait_queue_t wait;
1844
1845                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1846                                 err = -EAGAIN;
1847                                 break;
1848                         }
1849
1850                         set_current_state(TASK_INTERRUPTIBLE);
1851                         init_waitqueue_entry(&wait, current);
1852                         add_wait_queue(&tu->qchange_sleep, &wait);
1853
1854                         spin_unlock_irq(&tu->qlock);
1855                         schedule();
1856                         spin_lock_irq(&tu->qlock);
1857
1858                         remove_wait_queue(&tu->qchange_sleep, &wait);
1859
1860                         if (signal_pending(current)) {
1861                                 err = -ERESTARTSYS;
1862                                 break;
1863                         }
1864                 }
1865
1866                 spin_unlock_irq(&tu->qlock);
1867                 if (err < 0)
1868                         goto _error;
1869
1870                 if (tu->tread) {
1871                         if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1872                                          sizeof(struct snd_timer_tread))) {
1873                                 err = -EFAULT;
1874                                 goto _error;
1875                         }
1876                 } else {
1877                         if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1878                                          sizeof(struct snd_timer_read))) {
1879                                 err = -EFAULT;
1880                                 goto _error;
1881                         }
1882                 }
1883
1884                 tu->qhead %= tu->queue_size;
1885
1886                 result += unit;
1887                 buffer += unit;
1888
1889                 spin_lock_irq(&tu->qlock);
1890                 tu->qused--;
1891         }
1892         spin_unlock_irq(&tu->qlock);
1893  _error:
1894         return result > 0 ? result : err;
1895 }
1896
1897 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1898 {
1899         unsigned int mask;
1900         struct snd_timer_user *tu;
1901
1902         tu = file->private_data;
1903
1904         poll_wait(file, &tu->qchange_sleep, wait);
1905
1906         mask = 0;
1907         if (tu->qused)
1908                 mask |= POLLIN | POLLRDNORM;
1909
1910         return mask;
1911 }
1912
1913 #ifdef CONFIG_COMPAT
1914 #include "timer_compat.c"
1915 #else
1916 #define snd_timer_user_ioctl_compat     NULL
1917 #endif
1918
1919 static const struct file_operations snd_timer_f_ops =
1920 {
1921         .owner =        THIS_MODULE,
1922         .read =         snd_timer_user_read,
1923         .open =         snd_timer_user_open,
1924         .release =      snd_timer_user_release,
1925         .poll =         snd_timer_user_poll,
1926         .unlocked_ioctl =       snd_timer_user_ioctl,
1927         .compat_ioctl = snd_timer_user_ioctl_compat,
1928         .fasync =       snd_timer_user_fasync,
1929 };
1930
1931 /*
1932  *  ENTRY functions
1933  */
1934
1935 static int __init alsa_timer_init(void)
1936 {
1937         int err;
1938
1939 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1940         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1941                               "system timer");
1942 #endif
1943
1944         if ((err = snd_timer_register_system()) < 0)
1945                 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1946                            err);
1947         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1948                                        &snd_timer_f_ops, NULL, "timer")) < 0)
1949                 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1950                            err);
1951         snd_timer_proc_init();
1952         return 0;
1953 }
1954
1955 static void __exit alsa_timer_exit(void)
1956 {
1957         struct list_head *p, *n;
1958
1959         snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1960         /* unregister the system timer */
1961         list_for_each_safe(p, n, &snd_timer_list) {
1962                 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1963                 snd_timer_free(timer);
1964         }
1965         snd_timer_proc_done();
1966 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1967         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1968 #endif
1969 }
1970
1971 module_init(alsa_timer_init)
1972 module_exit(alsa_timer_exit)
1973
1974 EXPORT_SYMBOL(snd_timer_open);
1975 EXPORT_SYMBOL(snd_timer_close);
1976 EXPORT_SYMBOL(snd_timer_resolution);
1977 EXPORT_SYMBOL(snd_timer_start);
1978 EXPORT_SYMBOL(snd_timer_stop);
1979 EXPORT_SYMBOL(snd_timer_continue);
1980 EXPORT_SYMBOL(snd_timer_pause);
1981 EXPORT_SYMBOL(snd_timer_new);
1982 EXPORT_SYMBOL(snd_timer_notify);
1983 EXPORT_SYMBOL(snd_timer_global_new);
1984 EXPORT_SYMBOL(snd_timer_global_free);
1985 EXPORT_SYMBOL(snd_timer_global_register);
1986 EXPORT_SYMBOL(snd_timer_interrupt);