Dont touch fs_struct in drivers
[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_KMOD
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_KMOD
263         if (timer == NULL) {
264                 mutex_unlock(&register_mutex);
265                 snd_timer_request(tid);
266                 mutex_lock(&register_mutex);
267                 timer = snd_timer_find(tid);
268         }
269 #endif
270         if (!timer) {
271                 mutex_unlock(&register_mutex);
272                 return -ENODEV;
273         }
274         if (!list_empty(&timer->open_list_head)) {
275                 timeri = list_entry(timer->open_list_head.next,
276                                     struct snd_timer_instance, open_list);
277                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
278                         mutex_unlock(&register_mutex);
279                         return -EBUSY;
280                 }
281         }
282         timeri = snd_timer_instance_new(owner, timer);
283         if (!timeri) {
284                 mutex_unlock(&register_mutex);
285                 return -ENOMEM;
286         }
287         timeri->slave_class = tid->dev_sclass;
288         timeri->slave_id = slave_id;
289         if (list_empty(&timer->open_list_head) && timer->hw.open)
290                 timer->hw.open(timer);
291         list_add_tail(&timeri->open_list, &timer->open_list_head);
292         snd_timer_check_master(timeri);
293         mutex_unlock(&register_mutex);
294         *ti = timeri;
295         return 0;
296 }
297
298 static int _snd_timer_stop(struct snd_timer_instance *timeri,
299                            int keep_flag, int event);
300
301 /*
302  * close a timer instance
303  */
304 int snd_timer_close(struct snd_timer_instance *timeri)
305 {
306         struct snd_timer *timer = NULL;
307         struct snd_timer_instance *slave, *tmp;
308
309         snd_assert(timeri != NULL, return -ENXIO);
310
311         /* force to stop the timer */
312         snd_timer_stop(timeri);
313
314         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
315                 /* wait, until the active callback is finished */
316                 spin_lock_irq(&slave_active_lock);
317                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
318                         spin_unlock_irq(&slave_active_lock);
319                         udelay(10);
320                         spin_lock_irq(&slave_active_lock);
321                 }
322                 spin_unlock_irq(&slave_active_lock);
323                 mutex_lock(&register_mutex);
324                 list_del(&timeri->open_list);
325                 mutex_unlock(&register_mutex);
326         } else {
327                 timer = timeri->timer;
328                 /* wait, until the active callback is finished */
329                 spin_lock_irq(&timer->lock);
330                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
331                         spin_unlock_irq(&timer->lock);
332                         udelay(10);
333                         spin_lock_irq(&timer->lock);
334                 }
335                 spin_unlock_irq(&timer->lock);
336                 mutex_lock(&register_mutex);
337                 list_del(&timeri->open_list);
338                 if (timer && list_empty(&timer->open_list_head) &&
339                     timer->hw.close)
340                         timer->hw.close(timer);
341                 /* remove slave links */
342                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
343                                          open_list) {
344                         spin_lock_irq(&slave_active_lock);
345                         _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
346                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
347                         slave->master = NULL;
348                         slave->timer = NULL;
349                         spin_unlock_irq(&slave_active_lock);
350                 }
351                 mutex_unlock(&register_mutex);
352         }
353         if (timeri->private_free)
354                 timeri->private_free(timeri);
355         kfree(timeri->owner);
356         kfree(timeri);
357         if (timer)
358                 module_put(timer->module);
359         return 0;
360 }
361
362 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
363 {
364         struct snd_timer * timer;
365
366         if (timeri == NULL)
367                 return 0;
368         if ((timer = timeri->timer) != NULL) {
369                 if (timer->hw.c_resolution)
370                         return timer->hw.c_resolution(timer);
371                 return timer->hw.resolution;
372         }
373         return 0;
374 }
375
376 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
377 {
378         struct snd_timer *timer;
379         unsigned long flags;
380         unsigned long resolution = 0;
381         struct snd_timer_instance *ts;
382         struct timespec tstamp;
383
384         if (timer_tstamp_monotonic)
385                 do_posix_clock_monotonic_gettime(&tstamp);
386         else
387                 getnstimeofday(&tstamp);
388         snd_assert(event >= SNDRV_TIMER_EVENT_START &&
389                    event <= SNDRV_TIMER_EVENT_PAUSE, return);
390         if (event == SNDRV_TIMER_EVENT_START ||
391             event == SNDRV_TIMER_EVENT_CONTINUE)
392                 resolution = snd_timer_resolution(ti);
393         if (ti->ccallback)
394                 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
395         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
396                 return;
397         timer = ti->timer;
398         if (timer == NULL)
399                 return;
400         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
401                 return;
402         spin_lock_irqsave(&timer->lock, flags);
403         list_for_each_entry(ts, &ti->slave_active_head, active_list)
404                 if (ts->ccallback)
405                         ts->ccallback(ti, event + 100, &tstamp, resolution);
406         spin_unlock_irqrestore(&timer->lock, flags);
407 }
408
409 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
410                             unsigned long sticks)
411 {
412         list_del(&timeri->active_list);
413         list_add_tail(&timeri->active_list, &timer->active_list_head);
414         if (timer->running) {
415                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
416                         goto __start_now;
417                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
418                 timeri->flags |= SNDRV_TIMER_IFLG_START;
419                 return 1;       /* delayed start */
420         } else {
421                 timer->sticks = sticks;
422                 timer->hw.start(timer);
423               __start_now:
424                 timer->running++;
425                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
426                 return 0;
427         }
428 }
429
430 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
431 {
432         unsigned long flags;
433
434         spin_lock_irqsave(&slave_active_lock, flags);
435         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
436         if (timeri->master)
437                 list_add_tail(&timeri->active_list,
438                               &timeri->master->slave_active_head);
439         spin_unlock_irqrestore(&slave_active_lock, flags);
440         return 1; /* delayed start */
441 }
442
443 /*
444  *  start the timer instance
445  */
446 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
447 {
448         struct snd_timer *timer;
449         int result = -EINVAL;
450         unsigned long flags;
451
452         if (timeri == NULL || ticks < 1)
453                 return -EINVAL;
454         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
455                 result = snd_timer_start_slave(timeri);
456                 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
457                 return result;
458         }
459         timer = timeri->timer;
460         if (timer == NULL)
461                 return -EINVAL;
462         spin_lock_irqsave(&timer->lock, flags);
463         timeri->ticks = timeri->cticks = ticks;
464         timeri->pticks = 0;
465         result = snd_timer_start1(timer, timeri, ticks);
466         spin_unlock_irqrestore(&timer->lock, flags);
467         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
468         return result;
469 }
470
471 static int _snd_timer_stop(struct snd_timer_instance * timeri,
472                            int keep_flag, int event)
473 {
474         struct snd_timer *timer;
475         unsigned long flags;
476
477         snd_assert(timeri != NULL, return -ENXIO);
478
479         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
480                 if (!keep_flag) {
481                         spin_lock_irqsave(&slave_active_lock, flags);
482                         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
483                         spin_unlock_irqrestore(&slave_active_lock, flags);
484                 }
485                 goto __end;
486         }
487         timer = timeri->timer;
488         if (!timer)
489                 return -EINVAL;
490         spin_lock_irqsave(&timer->lock, flags);
491         list_del_init(&timeri->ack_list);
492         list_del_init(&timeri->active_list);
493         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
494             !(--timer->running)) {
495                 timer->hw.stop(timer);
496                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
497                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
498                         snd_timer_reschedule(timer, 0);
499                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
500                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
501                                 timer->hw.start(timer);
502                         }
503                 }
504         }
505         if (!keep_flag)
506                 timeri->flags &=
507                         ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
508         spin_unlock_irqrestore(&timer->lock, flags);
509       __end:
510         if (event != SNDRV_TIMER_EVENT_RESOLUTION)
511                 snd_timer_notify1(timeri, event);
512         return 0;
513 }
514
515 /*
516  * stop the timer instance.
517  *
518  * do not call this from the timer callback!
519  */
520 int snd_timer_stop(struct snd_timer_instance *timeri)
521 {
522         struct snd_timer *timer;
523         unsigned long flags;
524         int err;
525
526         err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
527         if (err < 0)
528                 return err;
529         timer = timeri->timer;
530         spin_lock_irqsave(&timer->lock, flags);
531         timeri->cticks = timeri->ticks;
532         timeri->pticks = 0;
533         spin_unlock_irqrestore(&timer->lock, flags);
534         return 0;
535 }
536
537 /*
538  * start again..  the tick is kept.
539  */
540 int snd_timer_continue(struct snd_timer_instance *timeri)
541 {
542         struct snd_timer *timer;
543         int result = -EINVAL;
544         unsigned long flags;
545
546         if (timeri == NULL)
547                 return result;
548         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
549                 return snd_timer_start_slave(timeri);
550         timer = timeri->timer;
551         if (! timer)
552                 return -EINVAL;
553         spin_lock_irqsave(&timer->lock, flags);
554         if (!timeri->cticks)
555                 timeri->cticks = 1;
556         timeri->pticks = 0;
557         result = snd_timer_start1(timer, timeri, timer->sticks);
558         spin_unlock_irqrestore(&timer->lock, flags);
559         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
560         return result;
561 }
562
563 /*
564  * pause.. remember the ticks left
565  */
566 int snd_timer_pause(struct snd_timer_instance * timeri)
567 {
568         return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
569 }
570
571 /*
572  * reschedule the timer
573  *
574  * start pending instances and check the scheduling ticks.
575  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
576  */
577 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
578 {
579         struct snd_timer_instance *ti;
580         unsigned long ticks = ~0UL;
581
582         list_for_each_entry(ti, &timer->active_list_head, active_list) {
583                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
584                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
585                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
586                         timer->running++;
587                 }
588                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
589                         if (ticks > ti->cticks)
590                                 ticks = ti->cticks;
591                 }
592         }
593         if (ticks == ~0UL) {
594                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
595                 return;
596         }
597         if (ticks > timer->hw.ticks)
598                 ticks = timer->hw.ticks;
599         if (ticks_left != ticks)
600                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
601         timer->sticks = ticks;
602 }
603
604 /*
605  * timer tasklet
606  *
607  */
608 static void snd_timer_tasklet(unsigned long arg)
609 {
610         struct snd_timer *timer = (struct snd_timer *) arg;
611         struct snd_timer_instance *ti;
612         struct list_head *p;
613         unsigned long resolution, ticks;
614         unsigned long flags;
615
616         spin_lock_irqsave(&timer->lock, flags);
617         /* now process all callbacks */
618         while (!list_empty(&timer->sack_list_head)) {
619                 p = timer->sack_list_head.next;         /* get first item */
620                 ti = list_entry(p, struct snd_timer_instance, ack_list);
621
622                 /* remove from ack_list and make empty */
623                 list_del_init(p);
624
625                 ticks = ti->pticks;
626                 ti->pticks = 0;
627                 resolution = ti->resolution;
628
629                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
630                 spin_unlock(&timer->lock);
631                 if (ti->callback)
632                         ti->callback(ti, resolution, ticks);
633                 spin_lock(&timer->lock);
634                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
635         }
636         spin_unlock_irqrestore(&timer->lock, flags);
637 }
638
639 /*
640  * timer interrupt
641  *
642  * ticks_left is usually equal to timer->sticks.
643  *
644  */
645 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
646 {
647         struct snd_timer_instance *ti, *ts, *tmp;
648         unsigned long resolution, ticks;
649         struct list_head *p, *ack_list_head;
650         unsigned long flags;
651         int use_tasklet = 0;
652
653         if (timer == NULL)
654                 return;
655
656         spin_lock_irqsave(&timer->lock, flags);
657
658         /* remember the current resolution */
659         if (timer->hw.c_resolution)
660                 resolution = timer->hw.c_resolution(timer);
661         else
662                 resolution = timer->hw.resolution;
663
664         /* loop for all active instances
665          * Here we cannot use list_for_each_entry because the active_list of a
666          * processed instance is relinked to done_list_head before the callback
667          * is called.
668          */
669         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
670                                  active_list) {
671                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
672                         continue;
673                 ti->pticks += ticks_left;
674                 ti->resolution = resolution;
675                 if (ti->cticks < ticks_left)
676                         ti->cticks = 0;
677                 else
678                         ti->cticks -= ticks_left;
679                 if (ti->cticks) /* not expired */
680                         continue;
681                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
682                         ti->cticks = ti->ticks;
683                 } else {
684                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
685                         if (--timer->running)
686                                 list_del(&ti->active_list);
687                 }
688                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
689                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
690                         ack_list_head = &timer->ack_list_head;
691                 else
692                         ack_list_head = &timer->sack_list_head;
693                 if (list_empty(&ti->ack_list))
694                         list_add_tail(&ti->ack_list, ack_list_head);
695                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
696                         ts->pticks = ti->pticks;
697                         ts->resolution = resolution;
698                         if (list_empty(&ts->ack_list))
699                                 list_add_tail(&ts->ack_list, ack_list_head);
700                 }
701         }
702         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
703                 snd_timer_reschedule(timer, timer->sticks);
704         if (timer->running) {
705                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
706                         timer->hw.stop(timer);
707                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
708                 }
709                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
710                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
711                         /* restart timer */
712                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
713                         timer->hw.start(timer);
714                 }
715         } else {
716                 timer->hw.stop(timer);
717         }
718
719         /* now process all fast callbacks */
720         while (!list_empty(&timer->ack_list_head)) {
721                 p = timer->ack_list_head.next;          /* get first item */
722                 ti = list_entry(p, struct snd_timer_instance, ack_list);
723
724                 /* remove from ack_list and make empty */
725                 list_del_init(p);
726
727                 ticks = ti->pticks;
728                 ti->pticks = 0;
729
730                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
731                 spin_unlock(&timer->lock);
732                 if (ti->callback)
733                         ti->callback(ti, resolution, ticks);
734                 spin_lock(&timer->lock);
735                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
736         }
737
738         /* do we have any slow callbacks? */
739         use_tasklet = !list_empty(&timer->sack_list_head);
740         spin_unlock_irqrestore(&timer->lock, flags);
741
742         if (use_tasklet)
743                 tasklet_hi_schedule(&timer->task_queue);
744 }
745
746 /*
747
748  */
749
750 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
751                   struct snd_timer **rtimer)
752 {
753         struct snd_timer *timer;
754         int err;
755         static struct snd_device_ops ops = {
756                 .dev_free = snd_timer_dev_free,
757                 .dev_register = snd_timer_dev_register,
758                 .dev_disconnect = snd_timer_dev_disconnect,
759         };
760
761         snd_assert(tid != NULL, return -EINVAL);
762         snd_assert(rtimer != NULL, return -EINVAL);
763         *rtimer = NULL;
764         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
765         if (timer == NULL) {
766                 snd_printk(KERN_ERR "timer: cannot allocate\n");
767                 return -ENOMEM;
768         }
769         timer->tmr_class = tid->dev_class;
770         timer->card = card;
771         timer->tmr_device = tid->device;
772         timer->tmr_subdevice = tid->subdevice;
773         if (id)
774                 strlcpy(timer->id, id, sizeof(timer->id));
775         INIT_LIST_HEAD(&timer->device_list);
776         INIT_LIST_HEAD(&timer->open_list_head);
777         INIT_LIST_HEAD(&timer->active_list_head);
778         INIT_LIST_HEAD(&timer->ack_list_head);
779         INIT_LIST_HEAD(&timer->sack_list_head);
780         spin_lock_init(&timer->lock);
781         tasklet_init(&timer->task_queue, snd_timer_tasklet,
782                      (unsigned long)timer);
783         if (card != NULL) {
784                 timer->module = card->module;
785                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
786                 if (err < 0) {
787                         snd_timer_free(timer);
788                         return err;
789                 }
790         }
791         *rtimer = timer;
792         return 0;
793 }
794
795 static int snd_timer_free(struct snd_timer *timer)
796 {
797         snd_assert(timer != NULL, return -ENXIO);
798
799         mutex_lock(&register_mutex);
800         if (! list_empty(&timer->open_list_head)) {
801                 struct list_head *p, *n;
802                 struct snd_timer_instance *ti;
803                 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
804                 list_for_each_safe(p, n, &timer->open_list_head) {
805                         list_del_init(p);
806                         ti = list_entry(p, struct snd_timer_instance, open_list);
807                         ti->timer = NULL;
808                 }
809         }
810         list_del(&timer->device_list);
811         mutex_unlock(&register_mutex);
812
813         if (timer->private_free)
814                 timer->private_free(timer);
815         kfree(timer);
816         return 0;
817 }
818
819 static int snd_timer_dev_free(struct snd_device *device)
820 {
821         struct snd_timer *timer = device->device_data;
822         return snd_timer_free(timer);
823 }
824
825 static int snd_timer_dev_register(struct snd_device *dev)
826 {
827         struct snd_timer *timer = dev->device_data;
828         struct snd_timer *timer1;
829
830         snd_assert(timer != NULL && timer->hw.start != NULL &&
831                    timer->hw.stop != NULL, return -ENXIO);
832         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
833             !timer->hw.resolution && timer->hw.c_resolution == NULL)
834                 return -EINVAL;
835
836         mutex_lock(&register_mutex);
837         list_for_each_entry(timer1, &snd_timer_list, device_list) {
838                 if (timer1->tmr_class > timer->tmr_class)
839                         break;
840                 if (timer1->tmr_class < timer->tmr_class)
841                         continue;
842                 if (timer1->card && timer->card) {
843                         if (timer1->card->number > timer->card->number)
844                                 break;
845                         if (timer1->card->number < timer->card->number)
846                                 continue;
847                 }
848                 if (timer1->tmr_device > timer->tmr_device)
849                         break;
850                 if (timer1->tmr_device < timer->tmr_device)
851                         continue;
852                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
853                         break;
854                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
855                         continue;
856                 /* conflicts.. */
857                 mutex_unlock(&register_mutex);
858                 return -EBUSY;
859         }
860         list_add_tail(&timer->device_list, &timer1->device_list);
861         mutex_unlock(&register_mutex);
862         return 0;
863 }
864
865 static int snd_timer_dev_disconnect(struct snd_device *device)
866 {
867         struct snd_timer *timer = device->device_data;
868         mutex_lock(&register_mutex);
869         list_del_init(&timer->device_list);
870         mutex_unlock(&register_mutex);
871         return 0;
872 }
873
874 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
875 {
876         unsigned long flags;
877         unsigned long resolution = 0;
878         struct snd_timer_instance *ti, *ts;
879
880         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
881                 return;
882         snd_assert(event >= SNDRV_TIMER_EVENT_MSTART &&
883                    event <= SNDRV_TIMER_EVENT_MRESUME, return);
884         spin_lock_irqsave(&timer->lock, flags);
885         if (event == SNDRV_TIMER_EVENT_MSTART ||
886             event == SNDRV_TIMER_EVENT_MCONTINUE ||
887             event == SNDRV_TIMER_EVENT_MRESUME) {
888                 if (timer->hw.c_resolution)
889                         resolution = timer->hw.c_resolution(timer);
890                 else
891                         resolution = timer->hw.resolution;
892         }
893         list_for_each_entry(ti, &timer->active_list_head, active_list) {
894                 if (ti->ccallback)
895                         ti->ccallback(ti, event, tstamp, resolution);
896                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
897                         if (ts->ccallback)
898                                 ts->ccallback(ts, event, tstamp, resolution);
899         }
900         spin_unlock_irqrestore(&timer->lock, flags);
901 }
902
903 /*
904  * exported functions for global timers
905  */
906 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
907 {
908         struct snd_timer_id tid;
909
910         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
911         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
912         tid.card = -1;
913         tid.device = device;
914         tid.subdevice = 0;
915         return snd_timer_new(NULL, id, &tid, rtimer);
916 }
917
918 int snd_timer_global_free(struct snd_timer *timer)
919 {
920         return snd_timer_free(timer);
921 }
922
923 int snd_timer_global_register(struct snd_timer *timer)
924 {
925         struct snd_device dev;
926
927         memset(&dev, 0, sizeof(dev));
928         dev.device_data = timer;
929         return snd_timer_dev_register(&dev);
930 }
931
932 /*
933  *  System timer
934  */
935
936 struct snd_timer_system_private {
937         struct timer_list tlist;
938         unsigned long last_expires;
939         unsigned long last_jiffies;
940         unsigned long correction;
941 };
942
943 static void snd_timer_s_function(unsigned long data)
944 {
945         struct snd_timer *timer = (struct snd_timer *)data;
946         struct snd_timer_system_private *priv = timer->private_data;
947         unsigned long jiff = jiffies;
948         if (time_after(jiff, priv->last_expires))
949                 priv->correction += (long)jiff - (long)priv->last_expires;
950         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
951 }
952
953 static int snd_timer_s_start(struct snd_timer * timer)
954 {
955         struct snd_timer_system_private *priv;
956         unsigned long njiff;
957
958         priv = (struct snd_timer_system_private *) timer->private_data;
959         njiff = (priv->last_jiffies = jiffies);
960         if (priv->correction > timer->sticks - 1) {
961                 priv->correction -= timer->sticks - 1;
962                 njiff++;
963         } else {
964                 njiff += timer->sticks - priv->correction;
965                 priv->correction = 0;
966         }
967         priv->last_expires = priv->tlist.expires = njiff;
968         add_timer(&priv->tlist);
969         return 0;
970 }
971
972 static int snd_timer_s_stop(struct snd_timer * timer)
973 {
974         struct snd_timer_system_private *priv;
975         unsigned long jiff;
976
977         priv = (struct snd_timer_system_private *) timer->private_data;
978         del_timer(&priv->tlist);
979         jiff = jiffies;
980         if (time_before(jiff, priv->last_expires))
981                 timer->sticks = priv->last_expires - jiff;
982         else
983                 timer->sticks = 1;
984         priv->correction = 0;
985         return 0;
986 }
987
988 static struct snd_timer_hardware snd_timer_system =
989 {
990         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
991         .resolution =   1000000000L / HZ,
992         .ticks =        10000000L,
993         .start =        snd_timer_s_start,
994         .stop =         snd_timer_s_stop
995 };
996
997 static void snd_timer_free_system(struct snd_timer *timer)
998 {
999         kfree(timer->private_data);
1000 }
1001
1002 static int snd_timer_register_system(void)
1003 {
1004         struct snd_timer *timer;
1005         struct snd_timer_system_private *priv;
1006         int err;
1007
1008         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1009         if (err < 0)
1010                 return err;
1011         strcpy(timer->name, "system timer");
1012         timer->hw = snd_timer_system;
1013         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1014         if (priv == NULL) {
1015                 snd_timer_free(timer);
1016                 return -ENOMEM;
1017         }
1018         init_timer(&priv->tlist);
1019         priv->tlist.function = snd_timer_s_function;
1020         priv->tlist.data = (unsigned long) timer;
1021         timer->private_data = priv;
1022         timer->private_free = snd_timer_free_system;
1023         return snd_timer_global_register(timer);
1024 }
1025
1026 #ifdef CONFIG_PROC_FS
1027 /*
1028  *  Info interface
1029  */
1030
1031 static void snd_timer_proc_read(struct snd_info_entry *entry,
1032                                 struct snd_info_buffer *buffer)
1033 {
1034         struct snd_timer *timer;
1035         struct snd_timer_instance *ti;
1036
1037         mutex_lock(&register_mutex);
1038         list_for_each_entry(timer, &snd_timer_list, device_list) {
1039                 switch (timer->tmr_class) {
1040                 case SNDRV_TIMER_CLASS_GLOBAL:
1041                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1042                         break;
1043                 case SNDRV_TIMER_CLASS_CARD:
1044                         snd_iprintf(buffer, "C%i-%i: ",
1045                                     timer->card->number, timer->tmr_device);
1046                         break;
1047                 case SNDRV_TIMER_CLASS_PCM:
1048                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1049                                     timer->tmr_device, timer->tmr_subdevice);
1050                         break;
1051                 default:
1052                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1053                                     timer->card ? timer->card->number : -1,
1054                                     timer->tmr_device, timer->tmr_subdevice);
1055                 }
1056                 snd_iprintf(buffer, "%s :", timer->name);
1057                 if (timer->hw.resolution)
1058                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1059                                     timer->hw.resolution / 1000,
1060                                     timer->hw.resolution % 1000,
1061                                     timer->hw.ticks);
1062                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1063                         snd_iprintf(buffer, " SLAVE");
1064                 snd_iprintf(buffer, "\n");
1065                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1066                         snd_iprintf(buffer, "  Client %s : %s\n",
1067                                     ti->owner ? ti->owner : "unknown",
1068                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1069                                                  SNDRV_TIMER_IFLG_RUNNING)
1070                                     ? "running" : "stopped");
1071         }
1072         mutex_unlock(&register_mutex);
1073 }
1074
1075 static struct snd_info_entry *snd_timer_proc_entry;
1076
1077 static void __init snd_timer_proc_init(void)
1078 {
1079         struct snd_info_entry *entry;
1080
1081         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1082         if (entry != NULL) {
1083                 entry->c.text.read = snd_timer_proc_read;
1084                 if (snd_info_register(entry) < 0) {
1085                         snd_info_free_entry(entry);
1086                         entry = NULL;
1087                 }
1088         }
1089         snd_timer_proc_entry = entry;
1090 }
1091
1092 static void __exit snd_timer_proc_done(void)
1093 {
1094         snd_info_free_entry(snd_timer_proc_entry);
1095 }
1096 #else /* !CONFIG_PROC_FS */
1097 #define snd_timer_proc_init()
1098 #define snd_timer_proc_done()
1099 #endif
1100
1101 /*
1102  *  USER SPACE interface
1103  */
1104
1105 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1106                                      unsigned long resolution,
1107                                      unsigned long ticks)
1108 {
1109         struct snd_timer_user *tu = timeri->callback_data;
1110         struct snd_timer_read *r;
1111         int prev;
1112
1113         spin_lock(&tu->qlock);
1114         if (tu->qused > 0) {
1115                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1116                 r = &tu->queue[prev];
1117                 if (r->resolution == resolution) {
1118                         r->ticks += ticks;
1119                         goto __wake;
1120                 }
1121         }
1122         if (tu->qused >= tu->queue_size) {
1123                 tu->overrun++;
1124         } else {
1125                 r = &tu->queue[tu->qtail++];
1126                 tu->qtail %= tu->queue_size;
1127                 r->resolution = resolution;
1128                 r->ticks = ticks;
1129                 tu->qused++;
1130         }
1131       __wake:
1132         spin_unlock(&tu->qlock);
1133         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1134         wake_up(&tu->qchange_sleep);
1135 }
1136
1137 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1138                                             struct snd_timer_tread *tread)
1139 {
1140         if (tu->qused >= tu->queue_size) {
1141                 tu->overrun++;
1142         } else {
1143                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1144                 tu->qtail %= tu->queue_size;
1145                 tu->qused++;
1146         }
1147 }
1148
1149 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1150                                      int event,
1151                                      struct timespec *tstamp,
1152                                      unsigned long resolution)
1153 {
1154         struct snd_timer_user *tu = timeri->callback_data;
1155         struct snd_timer_tread r1;
1156
1157         if (event >= SNDRV_TIMER_EVENT_START &&
1158             event <= SNDRV_TIMER_EVENT_PAUSE)
1159                 tu->tstamp = *tstamp;
1160         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1161                 return;
1162         r1.event = event;
1163         r1.tstamp = *tstamp;
1164         r1.val = resolution;
1165         spin_lock(&tu->qlock);
1166         snd_timer_user_append_to_tqueue(tu, &r1);
1167         spin_unlock(&tu->qlock);
1168         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1169         wake_up(&tu->qchange_sleep);
1170 }
1171
1172 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1173                                       unsigned long resolution,
1174                                       unsigned long ticks)
1175 {
1176         struct snd_timer_user *tu = timeri->callback_data;
1177         struct snd_timer_tread *r, r1;
1178         struct timespec tstamp;
1179         int prev, append = 0;
1180
1181         memset(&tstamp, 0, sizeof(tstamp));
1182         spin_lock(&tu->qlock);
1183         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1184                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1185                 spin_unlock(&tu->qlock);
1186                 return;
1187         }
1188         if (tu->last_resolution != resolution || ticks > 0) {
1189                 if (timer_tstamp_monotonic)
1190                         do_posix_clock_monotonic_gettime(&tstamp);
1191                 else
1192                         getnstimeofday(&tstamp);
1193         }
1194         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1195             tu->last_resolution != resolution) {
1196                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1197                 r1.tstamp = tstamp;
1198                 r1.val = resolution;
1199                 snd_timer_user_append_to_tqueue(tu, &r1);
1200                 tu->last_resolution = resolution;
1201                 append++;
1202         }
1203         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1204                 goto __wake;
1205         if (ticks == 0)
1206                 goto __wake;
1207         if (tu->qused > 0) {
1208                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1209                 r = &tu->tqueue[prev];
1210                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1211                         r->tstamp = tstamp;
1212                         r->val += ticks;
1213                         append++;
1214                         goto __wake;
1215                 }
1216         }
1217         r1.event = SNDRV_TIMER_EVENT_TICK;
1218         r1.tstamp = tstamp;
1219         r1.val = ticks;
1220         snd_timer_user_append_to_tqueue(tu, &r1);
1221         append++;
1222       __wake:
1223         spin_unlock(&tu->qlock);
1224         if (append == 0)
1225                 return;
1226         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1227         wake_up(&tu->qchange_sleep);
1228 }
1229
1230 static int snd_timer_user_open(struct inode *inode, struct file *file)
1231 {
1232         struct snd_timer_user *tu;
1233
1234         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1235         if (tu == NULL)
1236                 return -ENOMEM;
1237         spin_lock_init(&tu->qlock);
1238         init_waitqueue_head(&tu->qchange_sleep);
1239         mutex_init(&tu->tread_sem);
1240         tu->ticks = 1;
1241         tu->queue_size = 128;
1242         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1243                             GFP_KERNEL);
1244         if (tu->queue == NULL) {
1245                 kfree(tu);
1246                 return -ENOMEM;
1247         }
1248         file->private_data = tu;
1249         return 0;
1250 }
1251
1252 static int snd_timer_user_release(struct inode *inode, struct file *file)
1253 {
1254         struct snd_timer_user *tu;
1255
1256         if (file->private_data) {
1257                 tu = file->private_data;
1258                 file->private_data = NULL;
1259                 fasync_helper(-1, file, 0, &tu->fasync);
1260                 if (tu->timeri)
1261                         snd_timer_close(tu->timeri);
1262                 kfree(tu->queue);
1263                 kfree(tu->tqueue);
1264                 kfree(tu);
1265         }
1266         return 0;
1267 }
1268
1269 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1270 {
1271         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1272         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1273         id->card = -1;
1274         id->device = -1;
1275         id->subdevice = -1;
1276 }
1277
1278 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1279 {
1280         id->dev_class = timer->tmr_class;
1281         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1282         id->card = timer->card ? timer->card->number : -1;
1283         id->device = timer->tmr_device;
1284         id->subdevice = timer->tmr_subdevice;
1285 }
1286
1287 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1288 {
1289         struct snd_timer_id id;
1290         struct snd_timer *timer;
1291         struct list_head *p;
1292
1293         if (copy_from_user(&id, _tid, sizeof(id)))
1294                 return -EFAULT;
1295         mutex_lock(&register_mutex);
1296         if (id.dev_class < 0) {         /* first item */
1297                 if (list_empty(&snd_timer_list))
1298                         snd_timer_user_zero_id(&id);
1299                 else {
1300                         timer = list_entry(snd_timer_list.next,
1301                                            struct snd_timer, device_list);
1302                         snd_timer_user_copy_id(&id, timer);
1303                 }
1304         } else {
1305                 switch (id.dev_class) {
1306                 case SNDRV_TIMER_CLASS_GLOBAL:
1307                         id.device = id.device < 0 ? 0 : id.device + 1;
1308                         list_for_each(p, &snd_timer_list) {
1309                                 timer = list_entry(p, struct snd_timer, device_list);
1310                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1311                                         snd_timer_user_copy_id(&id, timer);
1312                                         break;
1313                                 }
1314                                 if (timer->tmr_device >= id.device) {
1315                                         snd_timer_user_copy_id(&id, timer);
1316                                         break;
1317                                 }
1318                         }
1319                         if (p == &snd_timer_list)
1320                                 snd_timer_user_zero_id(&id);
1321                         break;
1322                 case SNDRV_TIMER_CLASS_CARD:
1323                 case SNDRV_TIMER_CLASS_PCM:
1324                         if (id.card < 0) {
1325                                 id.card = 0;
1326                         } else {
1327                                 if (id.card < 0) {
1328                                         id.card = 0;
1329                                 } else {
1330                                         if (id.device < 0) {
1331                                                 id.device = 0;
1332                                         } else {
1333                                                 if (id.subdevice < 0) {
1334                                                         id.subdevice = 0;
1335                                                 } else {
1336                                                         id.subdevice++;
1337                                                 }
1338                                         }
1339                                 }
1340                         }
1341                         list_for_each(p, &snd_timer_list) {
1342                                 timer = list_entry(p, struct snd_timer, device_list);
1343                                 if (timer->tmr_class > id.dev_class) {
1344                                         snd_timer_user_copy_id(&id, timer);
1345                                         break;
1346                                 }
1347                                 if (timer->tmr_class < id.dev_class)
1348                                         continue;
1349                                 if (timer->card->number > id.card) {
1350                                         snd_timer_user_copy_id(&id, timer);
1351                                         break;
1352                                 }
1353                                 if (timer->card->number < id.card)
1354                                         continue;
1355                                 if (timer->tmr_device > id.device) {
1356                                         snd_timer_user_copy_id(&id, timer);
1357                                         break;
1358                                 }
1359                                 if (timer->tmr_device < id.device)
1360                                         continue;
1361                                 if (timer->tmr_subdevice > id.subdevice) {
1362                                         snd_timer_user_copy_id(&id, timer);
1363                                         break;
1364                                 }
1365                                 if (timer->tmr_subdevice < id.subdevice)
1366                                         continue;
1367                                 snd_timer_user_copy_id(&id, timer);
1368                                 break;
1369                         }
1370                         if (p == &snd_timer_list)
1371                                 snd_timer_user_zero_id(&id);
1372                         break;
1373                 default:
1374                         snd_timer_user_zero_id(&id);
1375                 }
1376         }
1377         mutex_unlock(&register_mutex);
1378         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1379                 return -EFAULT;
1380         return 0;
1381 }
1382
1383 static int snd_timer_user_ginfo(struct file *file,
1384                                 struct snd_timer_ginfo __user *_ginfo)
1385 {
1386         struct snd_timer_ginfo *ginfo;
1387         struct snd_timer_id tid;
1388         struct snd_timer *t;
1389         struct list_head *p;
1390         int err = 0;
1391
1392         ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1393         if (! ginfo)
1394                 return -ENOMEM;
1395         if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1396                 kfree(ginfo);
1397                 return -EFAULT;
1398         }
1399         tid = ginfo->tid;
1400         memset(ginfo, 0, sizeof(*ginfo));
1401         ginfo->tid = tid;
1402         mutex_lock(&register_mutex);
1403         t = snd_timer_find(&tid);
1404         if (t != NULL) {
1405                 ginfo->card = t->card ? t->card->number : -1;
1406                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1407                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1408                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1409                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1410                 ginfo->resolution = t->hw.resolution;
1411                 if (t->hw.resolution_min > 0) {
1412                         ginfo->resolution_min = t->hw.resolution_min;
1413                         ginfo->resolution_max = t->hw.resolution_max;
1414                 }
1415                 list_for_each(p, &t->open_list_head) {
1416                         ginfo->clients++;
1417                 }
1418         } else {
1419                 err = -ENODEV;
1420         }
1421         mutex_unlock(&register_mutex);
1422         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1423                 err = -EFAULT;
1424         kfree(ginfo);
1425         return err;
1426 }
1427
1428 static int snd_timer_user_gparams(struct file *file,
1429                                   struct snd_timer_gparams __user *_gparams)
1430 {
1431         struct snd_timer_gparams gparams;
1432         struct snd_timer *t;
1433         int err;
1434
1435         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1436                 return -EFAULT;
1437         mutex_lock(&register_mutex);
1438         t = snd_timer_find(&gparams.tid);
1439         if (!t) {
1440                 err = -ENODEV;
1441                 goto _error;
1442         }
1443         if (!list_empty(&t->open_list_head)) {
1444                 err = -EBUSY;
1445                 goto _error;
1446         }
1447         if (!t->hw.set_period) {
1448                 err = -ENOSYS;
1449                 goto _error;
1450         }
1451         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1452 _error:
1453         mutex_unlock(&register_mutex);
1454         return err;
1455 }
1456
1457 static int snd_timer_user_gstatus(struct file *file,
1458                                   struct snd_timer_gstatus __user *_gstatus)
1459 {
1460         struct snd_timer_gstatus gstatus;
1461         struct snd_timer_id tid;
1462         struct snd_timer *t;
1463         int err = 0;
1464
1465         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1466                 return -EFAULT;
1467         tid = gstatus.tid;
1468         memset(&gstatus, 0, sizeof(gstatus));
1469         gstatus.tid = tid;
1470         mutex_lock(&register_mutex);
1471         t = snd_timer_find(&tid);
1472         if (t != NULL) {
1473                 if (t->hw.c_resolution)
1474                         gstatus.resolution = t->hw.c_resolution(t);
1475                 else
1476                         gstatus.resolution = t->hw.resolution;
1477                 if (t->hw.precise_resolution) {
1478                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1479                                                  &gstatus.resolution_den);
1480                 } else {
1481                         gstatus.resolution_num = gstatus.resolution;
1482                         gstatus.resolution_den = 1000000000uL;
1483                 }
1484         } else {
1485                 err = -ENODEV;
1486         }
1487         mutex_unlock(&register_mutex);
1488         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1489                 err = -EFAULT;
1490         return err;
1491 }
1492
1493 static int snd_timer_user_tselect(struct file *file,
1494                                   struct snd_timer_select __user *_tselect)
1495 {
1496         struct snd_timer_user *tu;
1497         struct snd_timer_select tselect;
1498         char str[32];
1499         int err = 0;
1500
1501         tu = file->private_data;
1502         mutex_lock(&tu->tread_sem);
1503         if (tu->timeri) {
1504                 snd_timer_close(tu->timeri);
1505                 tu->timeri = NULL;
1506         }
1507         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1508                 err = -EFAULT;
1509                 goto __err;
1510         }
1511         sprintf(str, "application %i", current->pid);
1512         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1513                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1514         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1515         if (err < 0)
1516                 goto __err;
1517
1518         kfree(tu->queue);
1519         tu->queue = NULL;
1520         kfree(tu->tqueue);
1521         tu->tqueue = NULL;
1522         if (tu->tread) {
1523                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1524                                      GFP_KERNEL);
1525                 if (tu->tqueue == NULL)
1526                         err = -ENOMEM;
1527         } else {
1528                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1529                                     GFP_KERNEL);
1530                 if (tu->queue == NULL)
1531                         err = -ENOMEM;
1532         }
1533
1534         if (err < 0) {
1535                 snd_timer_close(tu->timeri);
1536                 tu->timeri = NULL;
1537         } else {
1538                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1539                 tu->timeri->callback = tu->tread
1540                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1541                 tu->timeri->ccallback = snd_timer_user_ccallback;
1542                 tu->timeri->callback_data = (void *)tu;
1543         }
1544
1545       __err:
1546         mutex_unlock(&tu->tread_sem);
1547         return err;
1548 }
1549
1550 static int snd_timer_user_info(struct file *file,
1551                                struct snd_timer_info __user *_info)
1552 {
1553         struct snd_timer_user *tu;
1554         struct snd_timer_info *info;
1555         struct snd_timer *t;
1556         int err = 0;
1557
1558         tu = file->private_data;
1559         if (!tu->timeri)
1560                 return -EBADFD;
1561         t = tu->timeri->timer;
1562         if (!t)
1563                 return -EBADFD;
1564
1565         info = kzalloc(sizeof(*info), GFP_KERNEL);
1566         if (! info)
1567                 return -ENOMEM;
1568         info->card = t->card ? t->card->number : -1;
1569         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1570                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1571         strlcpy(info->id, t->id, sizeof(info->id));
1572         strlcpy(info->name, t->name, sizeof(info->name));
1573         info->resolution = t->hw.resolution;
1574         if (copy_to_user(_info, info, sizeof(*_info)))
1575                 err = -EFAULT;
1576         kfree(info);
1577         return err;
1578 }
1579
1580 static int snd_timer_user_params(struct file *file,
1581                                  struct snd_timer_params __user *_params)
1582 {
1583         struct snd_timer_user *tu;
1584         struct snd_timer_params params;
1585         struct snd_timer *t;
1586         struct snd_timer_read *tr;
1587         struct snd_timer_tread *ttr;
1588         int err;
1589
1590         tu = file->private_data;
1591         if (!tu->timeri)
1592                 return -EBADFD;
1593         t = tu->timeri->timer;
1594         if (!t)
1595                 return -EBADFD;
1596         if (copy_from_user(&params, _params, sizeof(params)))
1597                 return -EFAULT;
1598         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1599                 err = -EINVAL;
1600                 goto _end;
1601         }
1602         if (params.queue_size > 0 &&
1603             (params.queue_size < 32 || params.queue_size > 1024)) {
1604                 err = -EINVAL;
1605                 goto _end;
1606         }
1607         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1608                               (1<<SNDRV_TIMER_EVENT_TICK)|
1609                               (1<<SNDRV_TIMER_EVENT_START)|
1610                               (1<<SNDRV_TIMER_EVENT_STOP)|
1611                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1612                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1613                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1614                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1615                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1616                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1617                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1618                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1619                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1620                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1621                 err = -EINVAL;
1622                 goto _end;
1623         }
1624         snd_timer_stop(tu->timeri);
1625         spin_lock_irq(&t->lock);
1626         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1627                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1628                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1629         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1630                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1631         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1632                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1633         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1634                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1635         spin_unlock_irq(&t->lock);
1636         if (params.queue_size > 0 &&
1637             (unsigned int)tu->queue_size != params.queue_size) {
1638                 if (tu->tread) {
1639                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1640                                       GFP_KERNEL);
1641                         if (ttr) {
1642                                 kfree(tu->tqueue);
1643                                 tu->queue_size = params.queue_size;
1644                                 tu->tqueue = ttr;
1645                         }
1646                 } else {
1647                         tr = kmalloc(params.queue_size * sizeof(*tr),
1648                                      GFP_KERNEL);
1649                         if (tr) {
1650                                 kfree(tu->queue);
1651                                 tu->queue_size = params.queue_size;
1652                                 tu->queue = tr;
1653                         }
1654                 }
1655         }
1656         tu->qhead = tu->qtail = tu->qused = 0;
1657         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1658                 if (tu->tread) {
1659                         struct snd_timer_tread tread;
1660                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1661                         tread.tstamp.tv_sec = 0;
1662                         tread.tstamp.tv_nsec = 0;
1663                         tread.val = 0;
1664                         snd_timer_user_append_to_tqueue(tu, &tread);
1665                 } else {
1666                         struct snd_timer_read *r = &tu->queue[0];
1667                         r->resolution = 0;
1668                         r->ticks = 0;
1669                         tu->qused++;
1670                         tu->qtail++;
1671                 }
1672         }
1673         tu->filter = params.filter;
1674         tu->ticks = params.ticks;
1675         err = 0;
1676  _end:
1677         if (copy_to_user(_params, &params, sizeof(params)))
1678                 return -EFAULT;
1679         return err;
1680 }
1681
1682 static int snd_timer_user_status(struct file *file,
1683                                  struct snd_timer_status __user *_status)
1684 {
1685         struct snd_timer_user *tu;
1686         struct snd_timer_status status;
1687
1688         tu = file->private_data;
1689         if (!tu->timeri)
1690                 return -EBADFD;
1691         memset(&status, 0, sizeof(status));
1692         status.tstamp = tu->tstamp;
1693         status.resolution = snd_timer_resolution(tu->timeri);
1694         status.lost = tu->timeri->lost;
1695         status.overrun = tu->overrun;
1696         spin_lock_irq(&tu->qlock);
1697         status.queue = tu->qused;
1698         spin_unlock_irq(&tu->qlock);
1699         if (copy_to_user(_status, &status, sizeof(status)))
1700                 return -EFAULT;
1701         return 0;
1702 }
1703
1704 static int snd_timer_user_start(struct file *file)
1705 {
1706         int err;
1707         struct snd_timer_user *tu;
1708
1709         tu = file->private_data;
1710         if (!tu->timeri)
1711                 return -EBADFD;
1712         snd_timer_stop(tu->timeri);
1713         tu->timeri->lost = 0;
1714         tu->last_resolution = 0;
1715         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1716 }
1717
1718 static int snd_timer_user_stop(struct file *file)
1719 {
1720         int err;
1721         struct snd_timer_user *tu;
1722
1723         tu = file->private_data;
1724         if (!tu->timeri)
1725                 return -EBADFD;
1726         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1727 }
1728
1729 static int snd_timer_user_continue(struct file *file)
1730 {
1731         int err;
1732         struct snd_timer_user *tu;
1733
1734         tu = file->private_data;
1735         if (!tu->timeri)
1736                 return -EBADFD;
1737         tu->timeri->lost = 0;
1738         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1739 }
1740
1741 static int snd_timer_user_pause(struct file *file)
1742 {
1743         int err;
1744         struct snd_timer_user *tu;
1745
1746         tu = file->private_data;
1747         if (!tu->timeri)
1748                 return -EBADFD;
1749         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1750 }
1751
1752 enum {
1753         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1754         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1755         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1756         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1757 };
1758
1759 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1760                                  unsigned long arg)
1761 {
1762         struct snd_timer_user *tu;
1763         void __user *argp = (void __user *)arg;
1764         int __user *p = argp;
1765
1766         tu = file->private_data;
1767         switch (cmd) {
1768         case SNDRV_TIMER_IOCTL_PVERSION:
1769                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1770         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1771                 return snd_timer_user_next_device(argp);
1772         case SNDRV_TIMER_IOCTL_TREAD:
1773         {
1774                 int xarg;
1775
1776                 mutex_lock(&tu->tread_sem);
1777                 if (tu->timeri) {       /* too late */
1778                         mutex_unlock(&tu->tread_sem);
1779                         return -EBUSY;
1780                 }
1781                 if (get_user(xarg, p)) {
1782                         mutex_unlock(&tu->tread_sem);
1783                         return -EFAULT;
1784                 }
1785                 tu->tread = xarg ? 1 : 0;
1786                 mutex_unlock(&tu->tread_sem);
1787                 return 0;
1788         }
1789         case SNDRV_TIMER_IOCTL_GINFO:
1790                 return snd_timer_user_ginfo(file, argp);
1791         case SNDRV_TIMER_IOCTL_GPARAMS:
1792                 return snd_timer_user_gparams(file, argp);
1793         case SNDRV_TIMER_IOCTL_GSTATUS:
1794                 return snd_timer_user_gstatus(file, argp);
1795         case SNDRV_TIMER_IOCTL_SELECT:
1796                 return snd_timer_user_tselect(file, argp);
1797         case SNDRV_TIMER_IOCTL_INFO:
1798                 return snd_timer_user_info(file, argp);
1799         case SNDRV_TIMER_IOCTL_PARAMS:
1800                 return snd_timer_user_params(file, argp);
1801         case SNDRV_TIMER_IOCTL_STATUS:
1802                 return snd_timer_user_status(file, argp);
1803         case SNDRV_TIMER_IOCTL_START:
1804         case SNDRV_TIMER_IOCTL_START_OLD:
1805                 return snd_timer_user_start(file);
1806         case SNDRV_TIMER_IOCTL_STOP:
1807         case SNDRV_TIMER_IOCTL_STOP_OLD:
1808                 return snd_timer_user_stop(file);
1809         case SNDRV_TIMER_IOCTL_CONTINUE:
1810         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1811                 return snd_timer_user_continue(file);
1812         case SNDRV_TIMER_IOCTL_PAUSE:
1813         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1814                 return snd_timer_user_pause(file);
1815         }
1816         return -ENOTTY;
1817 }
1818
1819 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1820 {
1821         struct snd_timer_user *tu;
1822         int err;
1823
1824         tu = file->private_data;
1825         err = fasync_helper(fd, file, on, &tu->fasync);
1826         if (err < 0)
1827                 return err;
1828         return 0;
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);