device.h: cleanup users outside of linux/include (C files)
[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/device.h>
28 #include <linux/module.h>
29 #include <linux/string.h>
30 #include <sound/core.h>
31 #include <sound/timer.h>
32 #include <sound/control.h>
33 #include <sound/info.h>
34 #include <sound/minors.h>
35 #include <sound/initval.h>
36 #include <linux/kmod.h>
37
38 #if defined(CONFIG_SND_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE)
39 #define DEFAULT_TIMER_LIMIT 4
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 static int timer_tstamp_monotonic = 1;
48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
49 MODULE_DESCRIPTION("ALSA timer interface");
50 MODULE_LICENSE("GPL");
51 module_param(timer_limit, int, 0444);
52 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
53 module_param(timer_tstamp_monotonic, int, 0444);
54 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
55
56 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
57 MODULE_ALIAS("devname:snd/timer");
58
59 struct snd_timer_user {
60         struct snd_timer_instance *timeri;
61         int tread;              /* enhanced read with timestamps and events */
62         unsigned long ticks;
63         unsigned long overrun;
64         int qhead;
65         int qtail;
66         int qused;
67         int queue_size;
68         struct snd_timer_read *queue;
69         struct snd_timer_tread *tqueue;
70         spinlock_t qlock;
71         unsigned long last_resolution;
72         unsigned int filter;
73         struct timespec tstamp;         /* trigger tstamp */
74         wait_queue_head_t qchange_sleep;
75         struct fasync_struct *fasync;
76         struct mutex tread_sem;
77 };
78
79 /* list of timers */
80 static LIST_HEAD(snd_timer_list);
81
82 /* list of slave instances */
83 static LIST_HEAD(snd_timer_slave_list);
84
85 /* lock for slave active lists */
86 static DEFINE_SPINLOCK(slave_active_lock);
87
88 static DEFINE_MUTEX(register_mutex);
89
90 static int snd_timer_free(struct snd_timer *timer);
91 static int snd_timer_dev_free(struct snd_device *device);
92 static int snd_timer_dev_register(struct snd_device *device);
93 static int snd_timer_dev_disconnect(struct snd_device *device);
94
95 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
96
97 /*
98  * create a timer instance with the given owner string.
99  * when timer is not NULL, increments the module counter
100  */
101 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
102                                                          struct snd_timer *timer)
103 {
104         struct snd_timer_instance *timeri;
105         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
106         if (timeri == NULL)
107                 return NULL;
108         timeri->owner = kstrdup(owner, GFP_KERNEL);
109         if (! timeri->owner) {
110                 kfree(timeri);
111                 return NULL;
112         }
113         INIT_LIST_HEAD(&timeri->open_list);
114         INIT_LIST_HEAD(&timeri->active_list);
115         INIT_LIST_HEAD(&timeri->ack_list);
116         INIT_LIST_HEAD(&timeri->slave_list_head);
117         INIT_LIST_HEAD(&timeri->slave_active_head);
118
119         timeri->timer = timer;
120         if (timer && !try_module_get(timer->module)) {
121                 kfree(timeri->owner);
122                 kfree(timeri);
123                 return NULL;
124         }
125
126         return timeri;
127 }
128
129 /*
130  * find a timer instance from the given timer id
131  */
132 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
133 {
134         struct snd_timer *timer = NULL;
135
136         list_for_each_entry(timer, &snd_timer_list, device_list) {
137                 if (timer->tmr_class != tid->dev_class)
138                         continue;
139                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
140                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
141                     (timer->card == NULL ||
142                      timer->card->number != tid->card))
143                         continue;
144                 if (timer->tmr_device != tid->device)
145                         continue;
146                 if (timer->tmr_subdevice != tid->subdevice)
147                         continue;
148                 return timer;
149         }
150         return NULL;
151 }
152
153 #ifdef CONFIG_MODULES
154
155 static void snd_timer_request(struct snd_timer_id *tid)
156 {
157         switch (tid->dev_class) {
158         case SNDRV_TIMER_CLASS_GLOBAL:
159                 if (tid->device < timer_limit)
160                         request_module("snd-timer-%i", tid->device);
161                 break;
162         case SNDRV_TIMER_CLASS_CARD:
163         case SNDRV_TIMER_CLASS_PCM:
164                 if (tid->card < snd_ecards_limit)
165                         request_module("snd-card-%i", tid->card);
166                 break;
167         default:
168                 break;
169         }
170 }
171
172 #endif
173
174 /*
175  * look for a master instance matching with the slave id of the given slave.
176  * when found, relink the open_link of the slave.
177  *
178  * call this with register_mutex down.
179  */
180 static void snd_timer_check_slave(struct snd_timer_instance *slave)
181 {
182         struct snd_timer *timer;
183         struct snd_timer_instance *master;
184
185         /* FIXME: it's really dumb to look up all entries.. */
186         list_for_each_entry(timer, &snd_timer_list, device_list) {
187                 list_for_each_entry(master, &timer->open_list_head, open_list) {
188                         if (slave->slave_class == master->slave_class &&
189                             slave->slave_id == master->slave_id) {
190                                 list_move_tail(&slave->open_list,
191                                                &master->slave_list_head);
192                                 spin_lock_irq(&slave_active_lock);
193                                 slave->master = master;
194                                 slave->timer = master->timer;
195                                 spin_unlock_irq(&slave_active_lock);
196                                 return;
197                         }
198                 }
199         }
200 }
201
202 /*
203  * look for slave instances matching with the slave id of the given master.
204  * when found, relink the open_link of slaves.
205  *
206  * call this with register_mutex down.
207  */
208 static void snd_timer_check_master(struct snd_timer_instance *master)
209 {
210         struct snd_timer_instance *slave, *tmp;
211
212         /* check all pending slaves */
213         list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
214                 if (slave->slave_class == master->slave_class &&
215                     slave->slave_id == master->slave_id) {
216                         list_move_tail(&slave->open_list, &master->slave_list_head);
217                         spin_lock_irq(&slave_active_lock);
218                         slave->master = master;
219                         slave->timer = master->timer;
220                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
221                                 list_add_tail(&slave->active_list,
222                                               &master->slave_active_head);
223                         spin_unlock_irq(&slave_active_lock);
224                 }
225         }
226 }
227
228 /*
229  * open a timer instance
230  * when opening a master, the slave id must be here given.
231  */
232 int snd_timer_open(struct snd_timer_instance **ti,
233                    char *owner, struct snd_timer_id *tid,
234                    unsigned int slave_id)
235 {
236         struct snd_timer *timer;
237         struct snd_timer_instance *timeri = NULL;
238
239         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
240                 /* open a slave instance */
241                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
242                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
243                         snd_printd("invalid slave class %i\n", tid->dev_sclass);
244                         return -EINVAL;
245                 }
246                 mutex_lock(&register_mutex);
247                 timeri = snd_timer_instance_new(owner, NULL);
248                 if (!timeri) {
249                         mutex_unlock(&register_mutex);
250                         return -ENOMEM;
251                 }
252                 timeri->slave_class = tid->dev_sclass;
253                 timeri->slave_id = tid->device;
254                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
255                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
256                 snd_timer_check_slave(timeri);
257                 mutex_unlock(&register_mutex);
258                 *ti = timeri;
259                 return 0;
260         }
261
262         /* open a master instance */
263         mutex_lock(&register_mutex);
264         timer = snd_timer_find(tid);
265 #ifdef CONFIG_MODULES
266         if (!timer) {
267                 mutex_unlock(&register_mutex);
268                 snd_timer_request(tid);
269                 mutex_lock(&register_mutex);
270                 timer = snd_timer_find(tid);
271         }
272 #endif
273         if (!timer) {
274                 mutex_unlock(&register_mutex);
275                 return -ENODEV;
276         }
277         if (!list_empty(&timer->open_list_head)) {
278                 timeri = list_entry(timer->open_list_head.next,
279                                     struct snd_timer_instance, open_list);
280                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
281                         mutex_unlock(&register_mutex);
282                         return -EBUSY;
283                 }
284         }
285         timeri = snd_timer_instance_new(owner, timer);
286         if (!timeri) {
287                 mutex_unlock(&register_mutex);
288                 return -ENOMEM;
289         }
290         timeri->slave_class = tid->dev_sclass;
291         timeri->slave_id = slave_id;
292         if (list_empty(&timer->open_list_head) && timer->hw.open)
293                 timer->hw.open(timer);
294         list_add_tail(&timeri->open_list, &timer->open_list_head);
295         snd_timer_check_master(timeri);
296         mutex_unlock(&register_mutex);
297         *ti = timeri;
298         return 0;
299 }
300
301 static int _snd_timer_stop(struct snd_timer_instance *timeri,
302                            int keep_flag, int event);
303
304 /*
305  * close a timer instance
306  */
307 int snd_timer_close(struct snd_timer_instance *timeri)
308 {
309         struct snd_timer *timer = NULL;
310         struct snd_timer_instance *slave, *tmp;
311
312         if (snd_BUG_ON(!timeri))
313                 return -ENXIO;
314
315         /* force to stop the timer */
316         snd_timer_stop(timeri);
317
318         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
319                 /* wait, until the active callback is finished */
320                 spin_lock_irq(&slave_active_lock);
321                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
322                         spin_unlock_irq(&slave_active_lock);
323                         udelay(10);
324                         spin_lock_irq(&slave_active_lock);
325                 }
326                 spin_unlock_irq(&slave_active_lock);
327                 mutex_lock(&register_mutex);
328                 list_del(&timeri->open_list);
329                 mutex_unlock(&register_mutex);
330         } else {
331                 timer = timeri->timer;
332                 if (snd_BUG_ON(!timer))
333                         goto out;
334                 /* wait, until the active callback is finished */
335                 spin_lock_irq(&timer->lock);
336                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
337                         spin_unlock_irq(&timer->lock);
338                         udelay(10);
339                         spin_lock_irq(&timer->lock);
340                 }
341                 spin_unlock_irq(&timer->lock);
342                 mutex_lock(&register_mutex);
343                 list_del(&timeri->open_list);
344                 if (timer && list_empty(&timer->open_list_head) &&
345                     timer->hw.close)
346                         timer->hw.close(timer);
347                 /* remove slave links */
348                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
349                                          open_list) {
350                         spin_lock_irq(&slave_active_lock);
351                         _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
352                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
353                         slave->master = NULL;
354                         slave->timer = NULL;
355                         spin_unlock_irq(&slave_active_lock);
356                 }
357                 mutex_unlock(&register_mutex);
358         }
359  out:
360         if (timeri->private_free)
361                 timeri->private_free(timeri);
362         kfree(timeri->owner);
363         kfree(timeri);
364         if (timer)
365                 module_put(timer->module);
366         return 0;
367 }
368
369 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
370 {
371         struct snd_timer * timer;
372
373         if (timeri == NULL)
374                 return 0;
375         if ((timer = timeri->timer) != NULL) {
376                 if (timer->hw.c_resolution)
377                         return timer->hw.c_resolution(timer);
378                 return timer->hw.resolution;
379         }
380         return 0;
381 }
382
383 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
384 {
385         struct snd_timer *timer;
386         unsigned long flags;
387         unsigned long resolution = 0;
388         struct snd_timer_instance *ts;
389         struct timespec tstamp;
390
391         if (timer_tstamp_monotonic)
392                 do_posix_clock_monotonic_gettime(&tstamp);
393         else
394                 getnstimeofday(&tstamp);
395         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
396                        event > SNDRV_TIMER_EVENT_PAUSE))
397                 return;
398         if (event == SNDRV_TIMER_EVENT_START ||
399             event == SNDRV_TIMER_EVENT_CONTINUE)
400                 resolution = snd_timer_resolution(ti);
401         if (ti->ccallback)
402                 ti->ccallback(ti, event, &tstamp, resolution);
403         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
404                 return;
405         timer = ti->timer;
406         if (timer == NULL)
407                 return;
408         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
409                 return;
410         spin_lock_irqsave(&timer->lock, flags);
411         list_for_each_entry(ts, &ti->slave_active_head, active_list)
412                 if (ts->ccallback)
413                         ts->ccallback(ti, event + 100, &tstamp, resolution);
414         spin_unlock_irqrestore(&timer->lock, flags);
415 }
416
417 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
418                             unsigned long sticks)
419 {
420         list_move_tail(&timeri->active_list, &timer->active_list_head);
421         if (timer->running) {
422                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
423                         goto __start_now;
424                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
425                 timeri->flags |= SNDRV_TIMER_IFLG_START;
426                 return 1;       /* delayed start */
427         } else {
428                 timer->sticks = sticks;
429                 timer->hw.start(timer);
430               __start_now:
431                 timer->running++;
432                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
433                 return 0;
434         }
435 }
436
437 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
438 {
439         unsigned long flags;
440
441         spin_lock_irqsave(&slave_active_lock, flags);
442         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
443         if (timeri->master)
444                 list_add_tail(&timeri->active_list,
445                               &timeri->master->slave_active_head);
446         spin_unlock_irqrestore(&slave_active_lock, flags);
447         return 1; /* delayed start */
448 }
449
450 /*
451  *  start the timer instance
452  */
453 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
454 {
455         struct snd_timer *timer;
456         int result = -EINVAL;
457         unsigned long flags;
458
459         if (timeri == NULL || ticks < 1)
460                 return -EINVAL;
461         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
462                 result = snd_timer_start_slave(timeri);
463                 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
464                 return result;
465         }
466         timer = timeri->timer;
467         if (timer == NULL)
468                 return -EINVAL;
469         spin_lock_irqsave(&timer->lock, flags);
470         timeri->ticks = timeri->cticks = ticks;
471         timeri->pticks = 0;
472         result = snd_timer_start1(timer, timeri, ticks);
473         spin_unlock_irqrestore(&timer->lock, flags);
474         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
475         return result;
476 }
477
478 static int _snd_timer_stop(struct snd_timer_instance * timeri,
479                            int keep_flag, int event)
480 {
481         struct snd_timer *timer;
482         unsigned long flags;
483
484         if (snd_BUG_ON(!timeri))
485                 return -ENXIO;
486
487         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
488                 if (!keep_flag) {
489                         spin_lock_irqsave(&slave_active_lock, flags);
490                         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
491                         spin_unlock_irqrestore(&slave_active_lock, flags);
492                 }
493                 goto __end;
494         }
495         timer = timeri->timer;
496         if (!timer)
497                 return -EINVAL;
498         spin_lock_irqsave(&timer->lock, flags);
499         list_del_init(&timeri->ack_list);
500         list_del_init(&timeri->active_list);
501         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
502             !(--timer->running)) {
503                 timer->hw.stop(timer);
504                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
505                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
506                         snd_timer_reschedule(timer, 0);
507                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
508                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
509                                 timer->hw.start(timer);
510                         }
511                 }
512         }
513         if (!keep_flag)
514                 timeri->flags &=
515                         ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
516         spin_unlock_irqrestore(&timer->lock, flags);
517       __end:
518         if (event != SNDRV_TIMER_EVENT_RESOLUTION)
519                 snd_timer_notify1(timeri, event);
520         return 0;
521 }
522
523 /*
524  * stop the timer instance.
525  *
526  * do not call this from the timer callback!
527  */
528 int snd_timer_stop(struct snd_timer_instance *timeri)
529 {
530         struct snd_timer *timer;
531         unsigned long flags;
532         int err;
533
534         err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
535         if (err < 0)
536                 return err;
537         timer = timeri->timer;
538         if (!timer)
539                 return -EINVAL;
540         spin_lock_irqsave(&timer->lock, flags);
541         timeri->cticks = timeri->ticks;
542         timeri->pticks = 0;
543         spin_unlock_irqrestore(&timer->lock, flags);
544         return 0;
545 }
546
547 /*
548  * start again..  the tick is kept.
549  */
550 int snd_timer_continue(struct snd_timer_instance *timeri)
551 {
552         struct snd_timer *timer;
553         int result = -EINVAL;
554         unsigned long flags;
555
556         if (timeri == NULL)
557                 return result;
558         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
559                 return snd_timer_start_slave(timeri);
560         timer = timeri->timer;
561         if (! timer)
562                 return -EINVAL;
563         spin_lock_irqsave(&timer->lock, flags);
564         if (!timeri->cticks)
565                 timeri->cticks = 1;
566         timeri->pticks = 0;
567         result = snd_timer_start1(timer, timeri, timer->sticks);
568         spin_unlock_irqrestore(&timer->lock, flags);
569         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
570         return result;
571 }
572
573 /*
574  * pause.. remember the ticks left
575  */
576 int snd_timer_pause(struct snd_timer_instance * timeri)
577 {
578         return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
579 }
580
581 /*
582  * reschedule the timer
583  *
584  * start pending instances and check the scheduling ticks.
585  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
586  */
587 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
588 {
589         struct snd_timer_instance *ti;
590         unsigned long ticks = ~0UL;
591
592         list_for_each_entry(ti, &timer->active_list_head, active_list) {
593                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
594                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
595                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
596                         timer->running++;
597                 }
598                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
599                         if (ticks > ti->cticks)
600                                 ticks = ti->cticks;
601                 }
602         }
603         if (ticks == ~0UL) {
604                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
605                 return;
606         }
607         if (ticks > timer->hw.ticks)
608                 ticks = timer->hw.ticks;
609         if (ticks_left != ticks)
610                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
611         timer->sticks = ticks;
612 }
613
614 /*
615  * timer tasklet
616  *
617  */
618 static void snd_timer_tasklet(unsigned long arg)
619 {
620         struct snd_timer *timer = (struct snd_timer *) arg;
621         struct snd_timer_instance *ti;
622         struct list_head *p;
623         unsigned long resolution, ticks;
624         unsigned long flags;
625
626         spin_lock_irqsave(&timer->lock, flags);
627         /* now process all callbacks */
628         while (!list_empty(&timer->sack_list_head)) {
629                 p = timer->sack_list_head.next;         /* get first item */
630                 ti = list_entry(p, struct snd_timer_instance, ack_list);
631
632                 /* remove from ack_list and make empty */
633                 list_del_init(p);
634
635                 ticks = ti->pticks;
636                 ti->pticks = 0;
637                 resolution = ti->resolution;
638
639                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
640                 spin_unlock(&timer->lock);
641                 if (ti->callback)
642                         ti->callback(ti, resolution, ticks);
643                 spin_lock(&timer->lock);
644                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
645         }
646         spin_unlock_irqrestore(&timer->lock, flags);
647 }
648
649 /*
650  * timer interrupt
651  *
652  * ticks_left is usually equal to timer->sticks.
653  *
654  */
655 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
656 {
657         struct snd_timer_instance *ti, *ts, *tmp;
658         unsigned long resolution, ticks;
659         struct list_head *p, *ack_list_head;
660         unsigned long flags;
661         int use_tasklet = 0;
662
663         if (timer == NULL)
664                 return;
665
666         spin_lock_irqsave(&timer->lock, flags);
667
668         /* remember the current resolution */
669         if (timer->hw.c_resolution)
670                 resolution = timer->hw.c_resolution(timer);
671         else
672                 resolution = timer->hw.resolution;
673
674         /* loop for all active instances
675          * Here we cannot use list_for_each_entry because the active_list of a
676          * processed instance is relinked to done_list_head before the callback
677          * is called.
678          */
679         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
680                                  active_list) {
681                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
682                         continue;
683                 ti->pticks += ticks_left;
684                 ti->resolution = resolution;
685                 if (ti->cticks < ticks_left)
686                         ti->cticks = 0;
687                 else
688                         ti->cticks -= ticks_left;
689                 if (ti->cticks) /* not expired */
690                         continue;
691                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
692                         ti->cticks = ti->ticks;
693                 } else {
694                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
695                         if (--timer->running)
696                                 list_del(&ti->active_list);
697                 }
698                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
699                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
700                         ack_list_head = &timer->ack_list_head;
701                 else
702                         ack_list_head = &timer->sack_list_head;
703                 if (list_empty(&ti->ack_list))
704                         list_add_tail(&ti->ack_list, ack_list_head);
705                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
706                         ts->pticks = ti->pticks;
707                         ts->resolution = resolution;
708                         if (list_empty(&ts->ack_list))
709                                 list_add_tail(&ts->ack_list, ack_list_head);
710                 }
711         }
712         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
713                 snd_timer_reschedule(timer, timer->sticks);
714         if (timer->running) {
715                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
716                         timer->hw.stop(timer);
717                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
718                 }
719                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
720                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
721                         /* restart timer */
722                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
723                         timer->hw.start(timer);
724                 }
725         } else {
726                 timer->hw.stop(timer);
727         }
728
729         /* now process all fast callbacks */
730         while (!list_empty(&timer->ack_list_head)) {
731                 p = timer->ack_list_head.next;          /* get first item */
732                 ti = list_entry(p, struct snd_timer_instance, ack_list);
733
734                 /* remove from ack_list and make empty */
735                 list_del_init(p);
736
737                 ticks = ti->pticks;
738                 ti->pticks = 0;
739
740                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
741                 spin_unlock(&timer->lock);
742                 if (ti->callback)
743                         ti->callback(ti, resolution, ticks);
744                 spin_lock(&timer->lock);
745                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
746         }
747
748         /* do we have any slow callbacks? */
749         use_tasklet = !list_empty(&timer->sack_list_head);
750         spin_unlock_irqrestore(&timer->lock, flags);
751
752         if (use_tasklet)
753                 tasklet_schedule(&timer->task_queue);
754 }
755
756 /*
757
758  */
759
760 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
761                   struct snd_timer **rtimer)
762 {
763         struct snd_timer *timer;
764         int err;
765         static struct snd_device_ops ops = {
766                 .dev_free = snd_timer_dev_free,
767                 .dev_register = snd_timer_dev_register,
768                 .dev_disconnect = snd_timer_dev_disconnect,
769         };
770
771         if (snd_BUG_ON(!tid))
772                 return -EINVAL;
773         if (rtimer)
774                 *rtimer = NULL;
775         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
776         if (timer == NULL) {
777                 snd_printk(KERN_ERR "timer: cannot allocate\n");
778                 return -ENOMEM;
779         }
780         timer->tmr_class = tid->dev_class;
781         timer->card = card;
782         timer->tmr_device = tid->device;
783         timer->tmr_subdevice = tid->subdevice;
784         if (id)
785                 strlcpy(timer->id, id, sizeof(timer->id));
786         INIT_LIST_HEAD(&timer->device_list);
787         INIT_LIST_HEAD(&timer->open_list_head);
788         INIT_LIST_HEAD(&timer->active_list_head);
789         INIT_LIST_HEAD(&timer->ack_list_head);
790         INIT_LIST_HEAD(&timer->sack_list_head);
791         spin_lock_init(&timer->lock);
792         tasklet_init(&timer->task_queue, snd_timer_tasklet,
793                      (unsigned long)timer);
794         if (card != NULL) {
795                 timer->module = card->module;
796                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
797                 if (err < 0) {
798                         snd_timer_free(timer);
799                         return err;
800                 }
801         }
802         if (rtimer)
803                 *rtimer = timer;
804         return 0;
805 }
806
807 static int snd_timer_free(struct snd_timer *timer)
808 {
809         if (!timer)
810                 return 0;
811
812         mutex_lock(&register_mutex);
813         if (! list_empty(&timer->open_list_head)) {
814                 struct list_head *p, *n;
815                 struct snd_timer_instance *ti;
816                 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
817                 list_for_each_safe(p, n, &timer->open_list_head) {
818                         list_del_init(p);
819                         ti = list_entry(p, struct snd_timer_instance, open_list);
820                         ti->timer = NULL;
821                 }
822         }
823         list_del(&timer->device_list);
824         mutex_unlock(&register_mutex);
825
826         if (timer->private_free)
827                 timer->private_free(timer);
828         kfree(timer);
829         return 0;
830 }
831
832 static int snd_timer_dev_free(struct snd_device *device)
833 {
834         struct snd_timer *timer = device->device_data;
835         return snd_timer_free(timer);
836 }
837
838 static int snd_timer_dev_register(struct snd_device *dev)
839 {
840         struct snd_timer *timer = dev->device_data;
841         struct snd_timer *timer1;
842
843         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
844                 return -ENXIO;
845         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
846             !timer->hw.resolution && timer->hw.c_resolution == NULL)
847                 return -EINVAL;
848
849         mutex_lock(&register_mutex);
850         list_for_each_entry(timer1, &snd_timer_list, device_list) {
851                 if (timer1->tmr_class > timer->tmr_class)
852                         break;
853                 if (timer1->tmr_class < timer->tmr_class)
854                         continue;
855                 if (timer1->card && timer->card) {
856                         if (timer1->card->number > timer->card->number)
857                                 break;
858                         if (timer1->card->number < timer->card->number)
859                                 continue;
860                 }
861                 if (timer1->tmr_device > timer->tmr_device)
862                         break;
863                 if (timer1->tmr_device < timer->tmr_device)
864                         continue;
865                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
866                         break;
867                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
868                         continue;
869                 /* conflicts.. */
870                 mutex_unlock(&register_mutex);
871                 return -EBUSY;
872         }
873         list_add_tail(&timer->device_list, &timer1->device_list);
874         mutex_unlock(&register_mutex);
875         return 0;
876 }
877
878 static int snd_timer_dev_disconnect(struct snd_device *device)
879 {
880         struct snd_timer *timer = device->device_data;
881         mutex_lock(&register_mutex);
882         list_del_init(&timer->device_list);
883         mutex_unlock(&register_mutex);
884         return 0;
885 }
886
887 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
888 {
889         unsigned long flags;
890         unsigned long resolution = 0;
891         struct snd_timer_instance *ti, *ts;
892
893         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
894                 return;
895         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
896                        event > SNDRV_TIMER_EVENT_MRESUME))
897                 return;
898         spin_lock_irqsave(&timer->lock, flags);
899         if (event == SNDRV_TIMER_EVENT_MSTART ||
900             event == SNDRV_TIMER_EVENT_MCONTINUE ||
901             event == SNDRV_TIMER_EVENT_MRESUME) {
902                 if (timer->hw.c_resolution)
903                         resolution = timer->hw.c_resolution(timer);
904                 else
905                         resolution = timer->hw.resolution;
906         }
907         list_for_each_entry(ti, &timer->active_list_head, active_list) {
908                 if (ti->ccallback)
909                         ti->ccallback(ti, event, tstamp, resolution);
910                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
911                         if (ts->ccallback)
912                                 ts->ccallback(ts, event, tstamp, resolution);
913         }
914         spin_unlock_irqrestore(&timer->lock, flags);
915 }
916
917 /*
918  * exported functions for global timers
919  */
920 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
921 {
922         struct snd_timer_id tid;
923
924         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
925         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
926         tid.card = -1;
927         tid.device = device;
928         tid.subdevice = 0;
929         return snd_timer_new(NULL, id, &tid, rtimer);
930 }
931
932 int snd_timer_global_free(struct snd_timer *timer)
933 {
934         return snd_timer_free(timer);
935 }
936
937 int snd_timer_global_register(struct snd_timer *timer)
938 {
939         struct snd_device dev;
940
941         memset(&dev, 0, sizeof(dev));
942         dev.device_data = timer;
943         return snd_timer_dev_register(&dev);
944 }
945
946 /*
947  *  System timer
948  */
949
950 struct snd_timer_system_private {
951         struct timer_list tlist;
952         unsigned long last_expires;
953         unsigned long last_jiffies;
954         unsigned long correction;
955 };
956
957 static void snd_timer_s_function(unsigned long data)
958 {
959         struct snd_timer *timer = (struct snd_timer *)data;
960         struct snd_timer_system_private *priv = timer->private_data;
961         unsigned long jiff = jiffies;
962         if (time_after(jiff, priv->last_expires))
963                 priv->correction += (long)jiff - (long)priv->last_expires;
964         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
965 }
966
967 static int snd_timer_s_start(struct snd_timer * timer)
968 {
969         struct snd_timer_system_private *priv;
970         unsigned long njiff;
971
972         priv = (struct snd_timer_system_private *) timer->private_data;
973         njiff = (priv->last_jiffies = jiffies);
974         if (priv->correction > timer->sticks - 1) {
975                 priv->correction -= timer->sticks - 1;
976                 njiff++;
977         } else {
978                 njiff += timer->sticks - priv->correction;
979                 priv->correction = 0;
980         }
981         priv->last_expires = priv->tlist.expires = njiff;
982         add_timer(&priv->tlist);
983         return 0;
984 }
985
986 static int snd_timer_s_stop(struct snd_timer * timer)
987 {
988         struct snd_timer_system_private *priv;
989         unsigned long jiff;
990
991         priv = (struct snd_timer_system_private *) timer->private_data;
992         del_timer(&priv->tlist);
993         jiff = jiffies;
994         if (time_before(jiff, priv->last_expires))
995                 timer->sticks = priv->last_expires - jiff;
996         else
997                 timer->sticks = 1;
998         priv->correction = 0;
999         return 0;
1000 }
1001
1002 static struct snd_timer_hardware snd_timer_system =
1003 {
1004         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1005         .resolution =   1000000000L / HZ,
1006         .ticks =        10000000L,
1007         .start =        snd_timer_s_start,
1008         .stop =         snd_timer_s_stop
1009 };
1010
1011 static void snd_timer_free_system(struct snd_timer *timer)
1012 {
1013         kfree(timer->private_data);
1014 }
1015
1016 static int snd_timer_register_system(void)
1017 {
1018         struct snd_timer *timer;
1019         struct snd_timer_system_private *priv;
1020         int err;
1021
1022         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1023         if (err < 0)
1024                 return err;
1025         strcpy(timer->name, "system timer");
1026         timer->hw = snd_timer_system;
1027         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1028         if (priv == NULL) {
1029                 snd_timer_free(timer);
1030                 return -ENOMEM;
1031         }
1032         init_timer(&priv->tlist);
1033         priv->tlist.function = snd_timer_s_function;
1034         priv->tlist.data = (unsigned long) timer;
1035         timer->private_data = priv;
1036         timer->private_free = snd_timer_free_system;
1037         return snd_timer_global_register(timer);
1038 }
1039
1040 #ifdef CONFIG_PROC_FS
1041 /*
1042  *  Info interface
1043  */
1044
1045 static void snd_timer_proc_read(struct snd_info_entry *entry,
1046                                 struct snd_info_buffer *buffer)
1047 {
1048         struct snd_timer *timer;
1049         struct snd_timer_instance *ti;
1050
1051         mutex_lock(&register_mutex);
1052         list_for_each_entry(timer, &snd_timer_list, device_list) {
1053                 switch (timer->tmr_class) {
1054                 case SNDRV_TIMER_CLASS_GLOBAL:
1055                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1056                         break;
1057                 case SNDRV_TIMER_CLASS_CARD:
1058                         snd_iprintf(buffer, "C%i-%i: ",
1059                                     timer->card->number, timer->tmr_device);
1060                         break;
1061                 case SNDRV_TIMER_CLASS_PCM:
1062                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1063                                     timer->tmr_device, timer->tmr_subdevice);
1064                         break;
1065                 default:
1066                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1067                                     timer->card ? timer->card->number : -1,
1068                                     timer->tmr_device, timer->tmr_subdevice);
1069                 }
1070                 snd_iprintf(buffer, "%s :", timer->name);
1071                 if (timer->hw.resolution)
1072                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1073                                     timer->hw.resolution / 1000,
1074                                     timer->hw.resolution % 1000,
1075                                     timer->hw.ticks);
1076                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1077                         snd_iprintf(buffer, " SLAVE");
1078                 snd_iprintf(buffer, "\n");
1079                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1080                         snd_iprintf(buffer, "  Client %s : %s\n",
1081                                     ti->owner ? ti->owner : "unknown",
1082                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1083                                                  SNDRV_TIMER_IFLG_RUNNING)
1084                                     ? "running" : "stopped");
1085         }
1086         mutex_unlock(&register_mutex);
1087 }
1088
1089 static struct snd_info_entry *snd_timer_proc_entry;
1090
1091 static void __init snd_timer_proc_init(void)
1092 {
1093         struct snd_info_entry *entry;
1094
1095         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1096         if (entry != NULL) {
1097                 entry->c.text.read = snd_timer_proc_read;
1098                 if (snd_info_register(entry) < 0) {
1099                         snd_info_free_entry(entry);
1100                         entry = NULL;
1101                 }
1102         }
1103         snd_timer_proc_entry = entry;
1104 }
1105
1106 static void __exit snd_timer_proc_done(void)
1107 {
1108         snd_info_free_entry(snd_timer_proc_entry);
1109 }
1110 #else /* !CONFIG_PROC_FS */
1111 #define snd_timer_proc_init()
1112 #define snd_timer_proc_done()
1113 #endif
1114
1115 /*
1116  *  USER SPACE interface
1117  */
1118
1119 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1120                                      unsigned long resolution,
1121                                      unsigned long ticks)
1122 {
1123         struct snd_timer_user *tu = timeri->callback_data;
1124         struct snd_timer_read *r;
1125         int prev;
1126
1127         spin_lock(&tu->qlock);
1128         if (tu->qused > 0) {
1129                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1130                 r = &tu->queue[prev];
1131                 if (r->resolution == resolution) {
1132                         r->ticks += ticks;
1133                         goto __wake;
1134                 }
1135         }
1136         if (tu->qused >= tu->queue_size) {
1137                 tu->overrun++;
1138         } else {
1139                 r = &tu->queue[tu->qtail++];
1140                 tu->qtail %= tu->queue_size;
1141                 r->resolution = resolution;
1142                 r->ticks = ticks;
1143                 tu->qused++;
1144         }
1145       __wake:
1146         spin_unlock(&tu->qlock);
1147         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1148         wake_up(&tu->qchange_sleep);
1149 }
1150
1151 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1152                                             struct snd_timer_tread *tread)
1153 {
1154         if (tu->qused >= tu->queue_size) {
1155                 tu->overrun++;
1156         } else {
1157                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1158                 tu->qtail %= tu->queue_size;
1159                 tu->qused++;
1160         }
1161 }
1162
1163 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1164                                      int event,
1165                                      struct timespec *tstamp,
1166                                      unsigned long resolution)
1167 {
1168         struct snd_timer_user *tu = timeri->callback_data;
1169         struct snd_timer_tread r1;
1170         unsigned long flags;
1171
1172         if (event >= SNDRV_TIMER_EVENT_START &&
1173             event <= SNDRV_TIMER_EVENT_PAUSE)
1174                 tu->tstamp = *tstamp;
1175         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1176                 return;
1177         r1.event = event;
1178         r1.tstamp = *tstamp;
1179         r1.val = resolution;
1180         spin_lock_irqsave(&tu->qlock, flags);
1181         snd_timer_user_append_to_tqueue(tu, &r1);
1182         spin_unlock_irqrestore(&tu->qlock, flags);
1183         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1184         wake_up(&tu->qchange_sleep);
1185 }
1186
1187 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1188                                       unsigned long resolution,
1189                                       unsigned long ticks)
1190 {
1191         struct snd_timer_user *tu = timeri->callback_data;
1192         struct snd_timer_tread *r, r1;
1193         struct timespec tstamp;
1194         int prev, append = 0;
1195
1196         memset(&tstamp, 0, sizeof(tstamp));
1197         spin_lock(&tu->qlock);
1198         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1199                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1200                 spin_unlock(&tu->qlock);
1201                 return;
1202         }
1203         if (tu->last_resolution != resolution || ticks > 0) {
1204                 if (timer_tstamp_monotonic)
1205                         do_posix_clock_monotonic_gettime(&tstamp);
1206                 else
1207                         getnstimeofday(&tstamp);
1208         }
1209         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1210             tu->last_resolution != resolution) {
1211                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1212                 r1.tstamp = tstamp;
1213                 r1.val = resolution;
1214                 snd_timer_user_append_to_tqueue(tu, &r1);
1215                 tu->last_resolution = resolution;
1216                 append++;
1217         }
1218         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1219                 goto __wake;
1220         if (ticks == 0)
1221                 goto __wake;
1222         if (tu->qused > 0) {
1223                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1224                 r = &tu->tqueue[prev];
1225                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1226                         r->tstamp = tstamp;
1227                         r->val += ticks;
1228                         append++;
1229                         goto __wake;
1230                 }
1231         }
1232         r1.event = SNDRV_TIMER_EVENT_TICK;
1233         r1.tstamp = tstamp;
1234         r1.val = ticks;
1235         snd_timer_user_append_to_tqueue(tu, &r1);
1236         append++;
1237       __wake:
1238         spin_unlock(&tu->qlock);
1239         if (append == 0)
1240                 return;
1241         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1242         wake_up(&tu->qchange_sleep);
1243 }
1244
1245 static int snd_timer_user_open(struct inode *inode, struct file *file)
1246 {
1247         struct snd_timer_user *tu;
1248         int err;
1249
1250         err = nonseekable_open(inode, file);
1251         if (err < 0)
1252                 return err;
1253
1254         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1255         if (tu == NULL)
1256                 return -ENOMEM;
1257         spin_lock_init(&tu->qlock);
1258         init_waitqueue_head(&tu->qchange_sleep);
1259         mutex_init(&tu->tread_sem);
1260         tu->ticks = 1;
1261         tu->queue_size = 128;
1262         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1263                             GFP_KERNEL);
1264         if (tu->queue == NULL) {
1265                 kfree(tu);
1266                 return -ENOMEM;
1267         }
1268         file->private_data = tu;
1269         return 0;
1270 }
1271
1272 static int snd_timer_user_release(struct inode *inode, struct file *file)
1273 {
1274         struct snd_timer_user *tu;
1275
1276         if (file->private_data) {
1277                 tu = file->private_data;
1278                 file->private_data = NULL;
1279                 if (tu->timeri)
1280                         snd_timer_close(tu->timeri);
1281                 kfree(tu->queue);
1282                 kfree(tu->tqueue);
1283                 kfree(tu);
1284         }
1285         return 0;
1286 }
1287
1288 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1289 {
1290         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1291         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1292         id->card = -1;
1293         id->device = -1;
1294         id->subdevice = -1;
1295 }
1296
1297 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1298 {
1299         id->dev_class = timer->tmr_class;
1300         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1301         id->card = timer->card ? timer->card->number : -1;
1302         id->device = timer->tmr_device;
1303         id->subdevice = timer->tmr_subdevice;
1304 }
1305
1306 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1307 {
1308         struct snd_timer_id id;
1309         struct snd_timer *timer;
1310         struct list_head *p;
1311
1312         if (copy_from_user(&id, _tid, sizeof(id)))
1313                 return -EFAULT;
1314         mutex_lock(&register_mutex);
1315         if (id.dev_class < 0) {         /* first item */
1316                 if (list_empty(&snd_timer_list))
1317                         snd_timer_user_zero_id(&id);
1318                 else {
1319                         timer = list_entry(snd_timer_list.next,
1320                                            struct snd_timer, device_list);
1321                         snd_timer_user_copy_id(&id, timer);
1322                 }
1323         } else {
1324                 switch (id.dev_class) {
1325                 case SNDRV_TIMER_CLASS_GLOBAL:
1326                         id.device = id.device < 0 ? 0 : id.device + 1;
1327                         list_for_each(p, &snd_timer_list) {
1328                                 timer = list_entry(p, struct snd_timer, device_list);
1329                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1330                                         snd_timer_user_copy_id(&id, timer);
1331                                         break;
1332                                 }
1333                                 if (timer->tmr_device >= id.device) {
1334                                         snd_timer_user_copy_id(&id, timer);
1335                                         break;
1336                                 }
1337                         }
1338                         if (p == &snd_timer_list)
1339                                 snd_timer_user_zero_id(&id);
1340                         break;
1341                 case SNDRV_TIMER_CLASS_CARD:
1342                 case SNDRV_TIMER_CLASS_PCM:
1343                         if (id.card < 0) {
1344                                 id.card = 0;
1345                         } else {
1346                                 if (id.card < 0) {
1347                                         id.card = 0;
1348                                 } else {
1349                                         if (id.device < 0) {
1350                                                 id.device = 0;
1351                                         } else {
1352                                                 if (id.subdevice < 0) {
1353                                                         id.subdevice = 0;
1354                                                 } else {
1355                                                         id.subdevice++;
1356                                                 }
1357                                         }
1358                                 }
1359                         }
1360                         list_for_each(p, &snd_timer_list) {
1361                                 timer = list_entry(p, struct snd_timer, device_list);
1362                                 if (timer->tmr_class > id.dev_class) {
1363                                         snd_timer_user_copy_id(&id, timer);
1364                                         break;
1365                                 }
1366                                 if (timer->tmr_class < id.dev_class)
1367                                         continue;
1368                                 if (timer->card->number > id.card) {
1369                                         snd_timer_user_copy_id(&id, timer);
1370                                         break;
1371                                 }
1372                                 if (timer->card->number < id.card)
1373                                         continue;
1374                                 if (timer->tmr_device > id.device) {
1375                                         snd_timer_user_copy_id(&id, timer);
1376                                         break;
1377                                 }
1378                                 if (timer->tmr_device < id.device)
1379                                         continue;
1380                                 if (timer->tmr_subdevice > id.subdevice) {
1381                                         snd_timer_user_copy_id(&id, timer);
1382                                         break;
1383                                 }
1384                                 if (timer->tmr_subdevice < id.subdevice)
1385                                         continue;
1386                                 snd_timer_user_copy_id(&id, timer);
1387                                 break;
1388                         }
1389                         if (p == &snd_timer_list)
1390                                 snd_timer_user_zero_id(&id);
1391                         break;
1392                 default:
1393                         snd_timer_user_zero_id(&id);
1394                 }
1395         }
1396         mutex_unlock(&register_mutex);
1397         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1398                 return -EFAULT;
1399         return 0;
1400 }
1401
1402 static int snd_timer_user_ginfo(struct file *file,
1403                                 struct snd_timer_ginfo __user *_ginfo)
1404 {
1405         struct snd_timer_ginfo *ginfo;
1406         struct snd_timer_id tid;
1407         struct snd_timer *t;
1408         struct list_head *p;
1409         int err = 0;
1410
1411         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1412         if (IS_ERR(ginfo))
1413                 return PTR_ERR(ginfo);
1414
1415         tid = ginfo->tid;
1416         memset(ginfo, 0, sizeof(*ginfo));
1417         ginfo->tid = tid;
1418         mutex_lock(&register_mutex);
1419         t = snd_timer_find(&tid);
1420         if (t != NULL) {
1421                 ginfo->card = t->card ? t->card->number : -1;
1422                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1423                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1424                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1425                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1426                 ginfo->resolution = t->hw.resolution;
1427                 if (t->hw.resolution_min > 0) {
1428                         ginfo->resolution_min = t->hw.resolution_min;
1429                         ginfo->resolution_max = t->hw.resolution_max;
1430                 }
1431                 list_for_each(p, &t->open_list_head) {
1432                         ginfo->clients++;
1433                 }
1434         } else {
1435                 err = -ENODEV;
1436         }
1437         mutex_unlock(&register_mutex);
1438         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1439                 err = -EFAULT;
1440         kfree(ginfo);
1441         return err;
1442 }
1443
1444 static int snd_timer_user_gparams(struct file *file,
1445                                   struct snd_timer_gparams __user *_gparams)
1446 {
1447         struct snd_timer_gparams gparams;
1448         struct snd_timer *t;
1449         int err;
1450
1451         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1452                 return -EFAULT;
1453         mutex_lock(&register_mutex);
1454         t = snd_timer_find(&gparams.tid);
1455         if (!t) {
1456                 err = -ENODEV;
1457                 goto _error;
1458         }
1459         if (!list_empty(&t->open_list_head)) {
1460                 err = -EBUSY;
1461                 goto _error;
1462         }
1463         if (!t->hw.set_period) {
1464                 err = -ENOSYS;
1465                 goto _error;
1466         }
1467         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1468 _error:
1469         mutex_unlock(&register_mutex);
1470         return err;
1471 }
1472
1473 static int snd_timer_user_gstatus(struct file *file,
1474                                   struct snd_timer_gstatus __user *_gstatus)
1475 {
1476         struct snd_timer_gstatus gstatus;
1477         struct snd_timer_id tid;
1478         struct snd_timer *t;
1479         int err = 0;
1480
1481         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1482                 return -EFAULT;
1483         tid = gstatus.tid;
1484         memset(&gstatus, 0, sizeof(gstatus));
1485         gstatus.tid = tid;
1486         mutex_lock(&register_mutex);
1487         t = snd_timer_find(&tid);
1488         if (t != NULL) {
1489                 if (t->hw.c_resolution)
1490                         gstatus.resolution = t->hw.c_resolution(t);
1491                 else
1492                         gstatus.resolution = t->hw.resolution;
1493                 if (t->hw.precise_resolution) {
1494                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1495                                                  &gstatus.resolution_den);
1496                 } else {
1497                         gstatus.resolution_num = gstatus.resolution;
1498                         gstatus.resolution_den = 1000000000uL;
1499                 }
1500         } else {
1501                 err = -ENODEV;
1502         }
1503         mutex_unlock(&register_mutex);
1504         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1505                 err = -EFAULT;
1506         return err;
1507 }
1508
1509 static int snd_timer_user_tselect(struct file *file,
1510                                   struct snd_timer_select __user *_tselect)
1511 {
1512         struct snd_timer_user *tu;
1513         struct snd_timer_select tselect;
1514         char str[32];
1515         int err = 0;
1516
1517         tu = file->private_data;
1518         mutex_lock(&tu->tread_sem);
1519         if (tu->timeri) {
1520                 snd_timer_close(tu->timeri);
1521                 tu->timeri = NULL;
1522         }
1523         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1524                 err = -EFAULT;
1525                 goto __err;
1526         }
1527         sprintf(str, "application %i", current->pid);
1528         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1529                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1530         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1531         if (err < 0)
1532                 goto __err;
1533
1534         kfree(tu->queue);
1535         tu->queue = NULL;
1536         kfree(tu->tqueue);
1537         tu->tqueue = NULL;
1538         if (tu->tread) {
1539                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1540                                      GFP_KERNEL);
1541                 if (tu->tqueue == NULL)
1542                         err = -ENOMEM;
1543         } else {
1544                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1545                                     GFP_KERNEL);
1546                 if (tu->queue == NULL)
1547                         err = -ENOMEM;
1548         }
1549
1550         if (err < 0) {
1551                 snd_timer_close(tu->timeri);
1552                 tu->timeri = NULL;
1553         } else {
1554                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1555                 tu->timeri->callback = tu->tread
1556                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1557                 tu->timeri->ccallback = snd_timer_user_ccallback;
1558                 tu->timeri->callback_data = (void *)tu;
1559         }
1560
1561       __err:
1562         mutex_unlock(&tu->tread_sem);
1563         return err;
1564 }
1565
1566 static int snd_timer_user_info(struct file *file,
1567                                struct snd_timer_info __user *_info)
1568 {
1569         struct snd_timer_user *tu;
1570         struct snd_timer_info *info;
1571         struct snd_timer *t;
1572         int err = 0;
1573
1574         tu = file->private_data;
1575         if (!tu->timeri)
1576                 return -EBADFD;
1577         t = tu->timeri->timer;
1578         if (!t)
1579                 return -EBADFD;
1580
1581         info = kzalloc(sizeof(*info), GFP_KERNEL);
1582         if (! info)
1583                 return -ENOMEM;
1584         info->card = t->card ? t->card->number : -1;
1585         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1586                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1587         strlcpy(info->id, t->id, sizeof(info->id));
1588         strlcpy(info->name, t->name, sizeof(info->name));
1589         info->resolution = t->hw.resolution;
1590         if (copy_to_user(_info, info, sizeof(*_info)))
1591                 err = -EFAULT;
1592         kfree(info);
1593         return err;
1594 }
1595
1596 static int snd_timer_user_params(struct file *file,
1597                                  struct snd_timer_params __user *_params)
1598 {
1599         struct snd_timer_user *tu;
1600         struct snd_timer_params params;
1601         struct snd_timer *t;
1602         struct snd_timer_read *tr;
1603         struct snd_timer_tread *ttr;
1604         int err;
1605
1606         tu = file->private_data;
1607         if (!tu->timeri)
1608                 return -EBADFD;
1609         t = tu->timeri->timer;
1610         if (!t)
1611                 return -EBADFD;
1612         if (copy_from_user(&params, _params, sizeof(params)))
1613                 return -EFAULT;
1614         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1615                 err = -EINVAL;
1616                 goto _end;
1617         }
1618         if (params.queue_size > 0 &&
1619             (params.queue_size < 32 || params.queue_size > 1024)) {
1620                 err = -EINVAL;
1621                 goto _end;
1622         }
1623         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1624                               (1<<SNDRV_TIMER_EVENT_TICK)|
1625                               (1<<SNDRV_TIMER_EVENT_START)|
1626                               (1<<SNDRV_TIMER_EVENT_STOP)|
1627                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1628                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1629                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1630                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1631                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1632                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1633                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1634                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1635                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1636                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1637                 err = -EINVAL;
1638                 goto _end;
1639         }
1640         snd_timer_stop(tu->timeri);
1641         spin_lock_irq(&t->lock);
1642         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1643                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1644                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1645         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1646                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1647         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1648                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1649         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1650                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1651         spin_unlock_irq(&t->lock);
1652         if (params.queue_size > 0 &&
1653             (unsigned int)tu->queue_size != params.queue_size) {
1654                 if (tu->tread) {
1655                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1656                                       GFP_KERNEL);
1657                         if (ttr) {
1658                                 kfree(tu->tqueue);
1659                                 tu->queue_size = params.queue_size;
1660                                 tu->tqueue = ttr;
1661                         }
1662                 } else {
1663                         tr = kmalloc(params.queue_size * sizeof(*tr),
1664                                      GFP_KERNEL);
1665                         if (tr) {
1666                                 kfree(tu->queue);
1667                                 tu->queue_size = params.queue_size;
1668                                 tu->queue = tr;
1669                         }
1670                 }
1671         }
1672         tu->qhead = tu->qtail = tu->qused = 0;
1673         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1674                 if (tu->tread) {
1675                         struct snd_timer_tread tread;
1676                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1677                         tread.tstamp.tv_sec = 0;
1678                         tread.tstamp.tv_nsec = 0;
1679                         tread.val = 0;
1680                         snd_timer_user_append_to_tqueue(tu, &tread);
1681                 } else {
1682                         struct snd_timer_read *r = &tu->queue[0];
1683                         r->resolution = 0;
1684                         r->ticks = 0;
1685                         tu->qused++;
1686                         tu->qtail++;
1687                 }
1688         }
1689         tu->filter = params.filter;
1690         tu->ticks = params.ticks;
1691         err = 0;
1692  _end:
1693         if (copy_to_user(_params, &params, sizeof(params)))
1694                 return -EFAULT;
1695         return err;
1696 }
1697
1698 static int snd_timer_user_status(struct file *file,
1699                                  struct snd_timer_status __user *_status)
1700 {
1701         struct snd_timer_user *tu;
1702         struct snd_timer_status status;
1703
1704         tu = file->private_data;
1705         if (!tu->timeri)
1706                 return -EBADFD;
1707         memset(&status, 0, sizeof(status));
1708         status.tstamp = tu->tstamp;
1709         status.resolution = snd_timer_resolution(tu->timeri);
1710         status.lost = tu->timeri->lost;
1711         status.overrun = tu->overrun;
1712         spin_lock_irq(&tu->qlock);
1713         status.queue = tu->qused;
1714         spin_unlock_irq(&tu->qlock);
1715         if (copy_to_user(_status, &status, sizeof(status)))
1716                 return -EFAULT;
1717         return 0;
1718 }
1719
1720 static int snd_timer_user_start(struct file *file)
1721 {
1722         int err;
1723         struct snd_timer_user *tu;
1724
1725         tu = file->private_data;
1726         if (!tu->timeri)
1727                 return -EBADFD;
1728         snd_timer_stop(tu->timeri);
1729         tu->timeri->lost = 0;
1730         tu->last_resolution = 0;
1731         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1732 }
1733
1734 static int snd_timer_user_stop(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_stop(tu->timeri)) < 0 ? err : 0;
1743 }
1744
1745 static int snd_timer_user_continue(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         tu->timeri->lost = 0;
1754         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1755 }
1756
1757 static int snd_timer_user_pause(struct file *file)
1758 {
1759         int err;
1760         struct snd_timer_user *tu;
1761
1762         tu = file->private_data;
1763         if (!tu->timeri)
1764                 return -EBADFD;
1765         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1766 }
1767
1768 enum {
1769         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1770         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1771         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1772         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1773 };
1774
1775 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1776                                  unsigned long arg)
1777 {
1778         struct snd_timer_user *tu;
1779         void __user *argp = (void __user *)arg;
1780         int __user *p = argp;
1781
1782         tu = file->private_data;
1783         switch (cmd) {
1784         case SNDRV_TIMER_IOCTL_PVERSION:
1785                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1786         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1787                 return snd_timer_user_next_device(argp);
1788         case SNDRV_TIMER_IOCTL_TREAD:
1789         {
1790                 int xarg;
1791
1792                 mutex_lock(&tu->tread_sem);
1793                 if (tu->timeri) {       /* too late */
1794                         mutex_unlock(&tu->tread_sem);
1795                         return -EBUSY;
1796                 }
1797                 if (get_user(xarg, p)) {
1798                         mutex_unlock(&tu->tread_sem);
1799                         return -EFAULT;
1800                 }
1801                 tu->tread = xarg ? 1 : 0;
1802                 mutex_unlock(&tu->tread_sem);
1803                 return 0;
1804         }
1805         case SNDRV_TIMER_IOCTL_GINFO:
1806                 return snd_timer_user_ginfo(file, argp);
1807         case SNDRV_TIMER_IOCTL_GPARAMS:
1808                 return snd_timer_user_gparams(file, argp);
1809         case SNDRV_TIMER_IOCTL_GSTATUS:
1810                 return snd_timer_user_gstatus(file, argp);
1811         case SNDRV_TIMER_IOCTL_SELECT:
1812                 return snd_timer_user_tselect(file, argp);
1813         case SNDRV_TIMER_IOCTL_INFO:
1814                 return snd_timer_user_info(file, argp);
1815         case SNDRV_TIMER_IOCTL_PARAMS:
1816                 return snd_timer_user_params(file, argp);
1817         case SNDRV_TIMER_IOCTL_STATUS:
1818                 return snd_timer_user_status(file, argp);
1819         case SNDRV_TIMER_IOCTL_START:
1820         case SNDRV_TIMER_IOCTL_START_OLD:
1821                 return snd_timer_user_start(file);
1822         case SNDRV_TIMER_IOCTL_STOP:
1823         case SNDRV_TIMER_IOCTL_STOP_OLD:
1824                 return snd_timer_user_stop(file);
1825         case SNDRV_TIMER_IOCTL_CONTINUE:
1826         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1827                 return snd_timer_user_continue(file);
1828         case SNDRV_TIMER_IOCTL_PAUSE:
1829         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1830                 return snd_timer_user_pause(file);
1831         }
1832         return -ENOTTY;
1833 }
1834
1835 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1836 {
1837         struct snd_timer_user *tu;
1838
1839         tu = file->private_data;
1840         return fasync_helper(fd, file, on, &tu->fasync);
1841 }
1842
1843 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1844                                    size_t count, loff_t *offset)
1845 {
1846         struct snd_timer_user *tu;
1847         long result = 0, unit;
1848         int err = 0;
1849
1850         tu = file->private_data;
1851         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1852         spin_lock_irq(&tu->qlock);
1853         while ((long)count - result >= unit) {
1854                 while (!tu->qused) {
1855                         wait_queue_t wait;
1856
1857                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1858                                 err = -EAGAIN;
1859                                 break;
1860                         }
1861
1862                         set_current_state(TASK_INTERRUPTIBLE);
1863                         init_waitqueue_entry(&wait, current);
1864                         add_wait_queue(&tu->qchange_sleep, &wait);
1865
1866                         spin_unlock_irq(&tu->qlock);
1867                         schedule();
1868                         spin_lock_irq(&tu->qlock);
1869
1870                         remove_wait_queue(&tu->qchange_sleep, &wait);
1871
1872                         if (signal_pending(current)) {
1873                                 err = -ERESTARTSYS;
1874                                 break;
1875                         }
1876                 }
1877
1878                 spin_unlock_irq(&tu->qlock);
1879                 if (err < 0)
1880                         goto _error;
1881
1882                 if (tu->tread) {
1883                         if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1884                                          sizeof(struct snd_timer_tread))) {
1885                                 err = -EFAULT;
1886                                 goto _error;
1887                         }
1888                 } else {
1889                         if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1890                                          sizeof(struct snd_timer_read))) {
1891                                 err = -EFAULT;
1892                                 goto _error;
1893                         }
1894                 }
1895
1896                 tu->qhead %= tu->queue_size;
1897
1898                 result += unit;
1899                 buffer += unit;
1900
1901                 spin_lock_irq(&tu->qlock);
1902                 tu->qused--;
1903         }
1904         spin_unlock_irq(&tu->qlock);
1905  _error:
1906         return result > 0 ? result : err;
1907 }
1908
1909 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1910 {
1911         unsigned int mask;
1912         struct snd_timer_user *tu;
1913
1914         tu = file->private_data;
1915
1916         poll_wait(file, &tu->qchange_sleep, wait);
1917
1918         mask = 0;
1919         if (tu->qused)
1920                 mask |= POLLIN | POLLRDNORM;
1921
1922         return mask;
1923 }
1924
1925 #ifdef CONFIG_COMPAT
1926 #include "timer_compat.c"
1927 #else
1928 #define snd_timer_user_ioctl_compat     NULL
1929 #endif
1930
1931 static const struct file_operations snd_timer_f_ops =
1932 {
1933         .owner =        THIS_MODULE,
1934         .read =         snd_timer_user_read,
1935         .open =         snd_timer_user_open,
1936         .release =      snd_timer_user_release,
1937         .llseek =       no_llseek,
1938         .poll =         snd_timer_user_poll,
1939         .unlocked_ioctl =       snd_timer_user_ioctl,
1940         .compat_ioctl = snd_timer_user_ioctl_compat,
1941         .fasync =       snd_timer_user_fasync,
1942 };
1943
1944 /*
1945  *  ENTRY functions
1946  */
1947
1948 static int __init alsa_timer_init(void)
1949 {
1950         int err;
1951
1952 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1953         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1954                               "system timer");
1955 #endif
1956
1957         if ((err = snd_timer_register_system()) < 0)
1958                 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1959                            err);
1960         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1961                                        &snd_timer_f_ops, NULL, "timer")) < 0)
1962                 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1963                            err);
1964         snd_timer_proc_init();
1965         return 0;
1966 }
1967
1968 static void __exit alsa_timer_exit(void)
1969 {
1970         struct list_head *p, *n;
1971
1972         snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1973         /* unregister the system timer */
1974         list_for_each_safe(p, n, &snd_timer_list) {
1975                 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1976                 snd_timer_free(timer);
1977         }
1978         snd_timer_proc_done();
1979 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1980         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1981 #endif
1982 }
1983
1984 module_init(alsa_timer_init)
1985 module_exit(alsa_timer_exit)
1986
1987 EXPORT_SYMBOL(snd_timer_open);
1988 EXPORT_SYMBOL(snd_timer_close);
1989 EXPORT_SYMBOL(snd_timer_resolution);
1990 EXPORT_SYMBOL(snd_timer_start);
1991 EXPORT_SYMBOL(snd_timer_stop);
1992 EXPORT_SYMBOL(snd_timer_continue);
1993 EXPORT_SYMBOL(snd_timer_pause);
1994 EXPORT_SYMBOL(snd_timer_new);
1995 EXPORT_SYMBOL(snd_timer_notify);
1996 EXPORT_SYMBOL(snd_timer_global_new);
1997 EXPORT_SYMBOL(snd_timer_global_free);
1998 EXPORT_SYMBOL(snd_timer_global_register);
1999 EXPORT_SYMBOL(snd_timer_interrupt);