4fcc8549e4a646beffa1c33ab4545516c0c35a99
[linux-2.6.git] / sound / core / timer.c
1 /*
2  *  Timers abstract layer
3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
4  *
5  *
6  *   This program is free software; you can redistribute it and/or modify
7  *   it under the terms of the GNU General Public License as published by
8  *   the Free Software Foundation; either version 2 of the License, or
9  *   (at your option) any later version.
10  *
11  *   This program is distributed in the hope that it will be useful,
12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *   GNU General Public License for more details.
15  *
16  *   You should have received a copy of the GNU General Public License
17  *   along with this program; if not, write to the Free Software
18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19  *
20  */
21
22 #include <sound/driver.h>
23 #include <linux/delay.h>
24 #include <linux/init.h>
25 #include <linux/smp_lock.h>
26 #include <linux/slab.h>
27 #include <linux/time.h>
28 #include <linux/mutex.h>
29 #include <linux/moduleparam.h>
30 #include <linux/string.h>
31 #include <sound/core.h>
32 #include <sound/timer.h>
33 #include <sound/control.h>
34 #include <sound/info.h>
35 #include <sound/minors.h>
36 #include <sound/initval.h>
37 #include <linux/kmod.h>
38 #ifdef CONFIG_KERNELD
39 #include <linux/kerneld.h>
40 #endif
41
42 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
43 #define DEFAULT_TIMER_LIMIT 3
44 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
45 #define DEFAULT_TIMER_LIMIT 2
46 #else
47 #define DEFAULT_TIMER_LIMIT 1
48 #endif
49
50 static int timer_limit = DEFAULT_TIMER_LIMIT;
51 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>");
52 MODULE_DESCRIPTION("ALSA timer interface");
53 MODULE_LICENSE("GPL");
54 module_param(timer_limit, int, 0444);
55 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
56
57 struct snd_timer_user {
58         struct snd_timer_instance *timeri;
59         int tread;              /* enhanced read with timestamps and events */
60         unsigned long ticks;
61         unsigned long overrun;
62         int qhead;
63         int qtail;
64         int qused;
65         int queue_size;
66         struct snd_timer_read *queue;
67         struct snd_timer_tread *tqueue;
68         spinlock_t qlock;
69         unsigned long last_resolution;
70         unsigned int filter;
71         struct timespec tstamp;         /* trigger tstamp */
72         wait_queue_head_t qchange_sleep;
73         struct fasync_struct *fasync;
74         struct mutex tread_sem;
75 };
76
77 /* list of timers */
78 static LIST_HEAD(snd_timer_list);
79
80 /* list of slave instances */
81 static LIST_HEAD(snd_timer_slave_list);
82
83 /* lock for slave active lists */
84 static DEFINE_SPINLOCK(slave_active_lock);
85
86 static DEFINE_MUTEX(register_mutex);
87
88 static int snd_timer_free(struct snd_timer *timer);
89 static int snd_timer_dev_free(struct snd_device *device);
90 static int snd_timer_dev_register(struct snd_device *device);
91 static int snd_timer_dev_disconnect(struct snd_device *device);
92
93 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
94
95 /*
96  * create a timer instance with the given owner string.
97  * when timer is not NULL, increments the module counter
98  */
99 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
100                                                          struct snd_timer *timer)
101 {
102         struct snd_timer_instance *timeri;
103         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
104         if (timeri == NULL)
105                 return NULL;
106         timeri->owner = kstrdup(owner, GFP_KERNEL);
107         if (! timeri->owner) {
108                 kfree(timeri);
109                 return NULL;
110         }
111         INIT_LIST_HEAD(&timeri->open_list);
112         INIT_LIST_HEAD(&timeri->active_list);
113         INIT_LIST_HEAD(&timeri->ack_list);
114         INIT_LIST_HEAD(&timeri->slave_list_head);
115         INIT_LIST_HEAD(&timeri->slave_active_head);
116
117         timeri->timer = timer;
118         if (timer && !try_module_get(timer->module)) {
119                 kfree(timeri->owner);
120                 kfree(timeri);
121                 return NULL;
122         }
123
124         return timeri;
125 }
126
127 /*
128  * find a timer instance from the given timer id
129  */
130 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
131 {
132         struct snd_timer *timer = NULL;
133         struct list_head *p;
134
135         list_for_each(p, &snd_timer_list) {
136                 timer = list_entry(p, struct snd_timer, device_list);
137
138                 if (timer->tmr_class != tid->dev_class)
139                         continue;
140                 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
141                      timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
142                     (timer->card == NULL ||
143                      timer->card->number != tid->card))
144                         continue;
145                 if (timer->tmr_device != tid->device)
146                         continue;
147                 if (timer->tmr_subdevice != tid->subdevice)
148                         continue;
149                 return timer;
150         }
151         return NULL;
152 }
153
154 #ifdef CONFIG_KMOD
155
156 static void snd_timer_request(struct snd_timer_id *tid)
157 {
158         if (! current->fs->root)
159                 return;
160         switch (tid->dev_class) {
161         case SNDRV_TIMER_CLASS_GLOBAL:
162                 if (tid->device < timer_limit)
163                         request_module("snd-timer-%i", tid->device);
164                 break;
165         case SNDRV_TIMER_CLASS_CARD:
166         case SNDRV_TIMER_CLASS_PCM:
167                 if (tid->card < snd_ecards_limit)
168                         request_module("snd-card-%i", tid->card);
169                 break;
170         default:
171                 break;
172         }
173 }
174
175 #endif
176
177 /*
178  * look for a master instance matching with the slave id of the given slave.
179  * when found, relink the open_link of the slave.
180  *
181  * call this with register_mutex down.
182  */
183 static void snd_timer_check_slave(struct snd_timer_instance *slave)
184 {
185         struct snd_timer *timer;
186         struct snd_timer_instance *master;
187         struct list_head *p, *q;
188
189         /* FIXME: it's really dumb to look up all entries.. */
190         list_for_each(p, &snd_timer_list) {
191                 timer = list_entry(p, struct snd_timer, device_list);
192                 list_for_each(q, &timer->open_list_head) {
193                         master = list_entry(q, struct snd_timer_instance, open_list);
194                         if (slave->slave_class == master->slave_class &&
195                             slave->slave_id == master->slave_id) {
196                                 list_del(&slave->open_list);
197                                 list_add_tail(&slave->open_list,
198                                               &master->slave_list_head);
199                                 spin_lock_irq(&slave_active_lock);
200                                 slave->master = master;
201                                 slave->timer = master->timer;
202                                 spin_unlock_irq(&slave_active_lock);
203                                 return;
204                         }
205                 }
206         }
207 }
208
209 /*
210  * look for slave instances matching with the slave id of the given master.
211  * when found, relink the open_link of slaves.
212  *
213  * call this with register_mutex down.
214  */
215 static void snd_timer_check_master(struct snd_timer_instance *master)
216 {
217         struct snd_timer_instance *slave;
218         struct list_head *p, *n;
219
220         /* check all pending slaves */
221         list_for_each_safe(p, n, &snd_timer_slave_list) {
222                 slave = list_entry(p, struct snd_timer_instance, open_list);
223                 if (slave->slave_class == master->slave_class &&
224                     slave->slave_id == master->slave_id) {
225                         list_del(p);
226                         list_add_tail(p, &master->slave_list_head);
227                         spin_lock_irq(&slave_active_lock);
228                         slave->master = master;
229                         slave->timer = master->timer;
230                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
231                                 list_add_tail(&slave->active_list,
232                                               &master->slave_active_head);
233                         spin_unlock_irq(&slave_active_lock);
234                 }
235         }
236 }
237
238 /*
239  * open a timer instance
240  * when opening a master, the slave id must be here given.
241  */
242 int snd_timer_open(struct snd_timer_instance **ti,
243                    char *owner, struct snd_timer_id *tid,
244                    unsigned int slave_id)
245 {
246         struct snd_timer *timer;
247         struct snd_timer_instance *timeri = NULL;
248
249         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
250                 /* open a slave instance */
251                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
252                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
253                         snd_printd("invalid slave class %i\n", tid->dev_sclass);
254                         return -EINVAL;
255                 }
256                 mutex_lock(&register_mutex);
257                 timeri = snd_timer_instance_new(owner, NULL);
258                 if (!timeri) {
259                         mutex_unlock(&register_mutex);
260                         return -ENOMEM;
261                 }
262                 timeri->slave_class = tid->dev_sclass;
263                 timeri->slave_id = tid->device;
264                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
265                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
266                 snd_timer_check_slave(timeri);
267                 mutex_unlock(&register_mutex);
268                 *ti = timeri;
269                 return 0;
270         }
271
272         /* open a master instance */
273         mutex_lock(&register_mutex);
274         timer = snd_timer_find(tid);
275 #ifdef CONFIG_KMOD
276         if (timer == NULL) {
277                 mutex_unlock(&register_mutex);
278                 snd_timer_request(tid);
279                 mutex_lock(&register_mutex);
280                 timer = snd_timer_find(tid);
281         }
282 #endif
283         if (!timer) {
284                 mutex_unlock(&register_mutex);
285                 return -ENODEV;
286         }
287         if (!list_empty(&timer->open_list_head)) {
288                 timeri = list_entry(timer->open_list_head.next,
289                                     struct snd_timer_instance, open_list);
290                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
291                         mutex_unlock(&register_mutex);
292                         return -EBUSY;
293                 }
294         }
295         timeri = snd_timer_instance_new(owner, timer);
296         if (!timeri) {
297                 mutex_unlock(&register_mutex);
298                 return -ENOMEM;
299         }
300         timeri->slave_class = tid->dev_sclass;
301         timeri->slave_id = slave_id;
302         if (list_empty(&timer->open_list_head) && timer->hw.open)
303                 timer->hw.open(timer);
304         list_add_tail(&timeri->open_list, &timer->open_list_head);
305         snd_timer_check_master(timeri);
306         mutex_unlock(&register_mutex);
307         *ti = timeri;
308         return 0;
309 }
310
311 static int _snd_timer_stop(struct snd_timer_instance *timeri,
312                            int keep_flag, int event);
313
314 /*
315  * close a timer instance
316  */
317 int snd_timer_close(struct snd_timer_instance *timeri)
318 {
319         struct snd_timer *timer = NULL;
320         struct list_head *p, *n;
321         struct snd_timer_instance *slave;
322
323         snd_assert(timeri != NULL, return -ENXIO);
324
325         /* force to stop the timer */
326         snd_timer_stop(timeri);
327
328         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
329                 /* wait, until the active callback is finished */
330                 spin_lock_irq(&slave_active_lock);
331                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
332                         spin_unlock_irq(&slave_active_lock);
333                         udelay(10);
334                         spin_lock_irq(&slave_active_lock);
335                 }
336                 spin_unlock_irq(&slave_active_lock);
337                 mutex_lock(&register_mutex);
338                 list_del(&timeri->open_list);
339                 mutex_unlock(&register_mutex);
340         } else {
341                 timer = timeri->timer;
342                 /* wait, until the active callback is finished */
343                 spin_lock_irq(&timer->lock);
344                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
345                         spin_unlock_irq(&timer->lock);
346                         udelay(10);
347                         spin_lock_irq(&timer->lock);
348                 }
349                 spin_unlock_irq(&timer->lock);
350                 mutex_lock(&register_mutex);
351                 list_del(&timeri->open_list);
352                 if (timer && list_empty(&timer->open_list_head) &&
353                     timer->hw.close)
354                         timer->hw.close(timer);
355                 /* remove slave links */
356                 list_for_each_safe(p, n, &timeri->slave_list_head) {
357                         slave = list_entry(p, struct snd_timer_instance, open_list);
358                         spin_lock_irq(&slave_active_lock);
359                         _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
360                         list_del(p);
361                         list_add_tail(p, &snd_timer_slave_list);
362                         slave->master = NULL;
363                         slave->timer = NULL;
364                         spin_unlock_irq(&slave_active_lock);
365                 }
366                 mutex_unlock(&register_mutex);
367         }
368         if (timeri->private_free)
369                 timeri->private_free(timeri);
370         kfree(timeri->owner);
371         kfree(timeri);
372         if (timer)
373                 module_put(timer->module);
374         return 0;
375 }
376
377 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
378 {
379         struct snd_timer * timer;
380
381         if (timeri == NULL)
382                 return 0;
383         if ((timer = timeri->timer) != NULL) {
384                 if (timer->hw.c_resolution)
385                         return timer->hw.c_resolution(timer);
386                 return timer->hw.resolution;
387         }
388         return 0;
389 }
390
391 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
392 {
393         struct snd_timer *timer;
394         unsigned long flags;
395         unsigned long resolution = 0;
396         struct snd_timer_instance *ts;
397         struct list_head *n;
398         struct timespec tstamp;
399
400         getnstimeofday(&tstamp);
401         snd_assert(event >= SNDRV_TIMER_EVENT_START &&
402                    event <= SNDRV_TIMER_EVENT_PAUSE, return);
403         if (event == SNDRV_TIMER_EVENT_START ||
404             event == SNDRV_TIMER_EVENT_CONTINUE)
405                 resolution = snd_timer_resolution(ti);
406         if (ti->ccallback)
407                 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
408         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
409                 return;
410         timer = ti->timer;
411         if (timer == NULL)
412                 return;
413         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
414                 return;
415         spin_lock_irqsave(&timer->lock, flags);
416         list_for_each(n, &ti->slave_active_head) {
417                 ts = list_entry(n, struct snd_timer_instance, active_list);
418                 if (ts->ccallback)
419                         ts->ccallback(ti, event + 100, &tstamp, resolution);
420         }
421         spin_unlock_irqrestore(&timer->lock, flags);
422 }
423
424 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
425                             unsigned long sticks)
426 {
427         list_del(&timeri->active_list);
428         list_add_tail(&timeri->active_list, &timer->active_list_head);
429         if (timer->running) {
430                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
431                         goto __start_now;
432                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
433                 timeri->flags |= SNDRV_TIMER_IFLG_START;
434                 return 1;       /* delayed start */
435         } else {
436                 timer->sticks = sticks;
437                 timer->hw.start(timer);
438               __start_now:
439                 timer->running++;
440                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
441                 return 0;
442         }
443 }
444
445 static int snd_timer_start_slave(struct snd_timer_instance *timeri)
446 {
447         unsigned long flags;
448
449         spin_lock_irqsave(&slave_active_lock, flags);
450         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
451         if (timeri->master)
452                 list_add_tail(&timeri->active_list,
453                               &timeri->master->slave_active_head);
454         spin_unlock_irqrestore(&slave_active_lock, flags);
455         return 1; /* delayed start */
456 }
457
458 /*
459  *  start the timer instance
460  */
461 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
462 {
463         struct snd_timer *timer;
464         int result = -EINVAL;
465         unsigned long flags;
466
467         if (timeri == NULL || ticks < 1)
468                 return -EINVAL;
469         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
470                 result = snd_timer_start_slave(timeri);
471                 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
472                 return result;
473         }
474         timer = timeri->timer;
475         if (timer == NULL)
476                 return -EINVAL;
477         spin_lock_irqsave(&timer->lock, flags);
478         timeri->ticks = timeri->cticks = ticks;
479         timeri->pticks = 0;
480         result = snd_timer_start1(timer, timeri, ticks);
481         spin_unlock_irqrestore(&timer->lock, flags);
482         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
483         return result;
484 }
485
486 static int _snd_timer_stop(struct snd_timer_instance * timeri,
487                            int keep_flag, int event)
488 {
489         struct snd_timer *timer;
490         unsigned long flags;
491
492         snd_assert(timeri != NULL, return -ENXIO);
493
494         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
495                 if (!keep_flag) {
496                         spin_lock_irqsave(&slave_active_lock, flags);
497                         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
498                         spin_unlock_irqrestore(&slave_active_lock, flags);
499                 }
500                 goto __end;
501         }
502         timer = timeri->timer;
503         if (!timer)
504                 return -EINVAL;
505         spin_lock_irqsave(&timer->lock, flags);
506         list_del_init(&timeri->ack_list);
507         list_del_init(&timeri->active_list);
508         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
509             !(--timer->running)) {
510                 timer->hw.stop(timer);
511                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
512                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
513                         snd_timer_reschedule(timer, 0);
514                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
515                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
516                                 timer->hw.start(timer);
517                         }
518                 }
519         }
520         if (!keep_flag)
521                 timeri->flags &=
522                         ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
523         spin_unlock_irqrestore(&timer->lock, flags);
524       __end:
525         if (event != SNDRV_TIMER_EVENT_RESOLUTION)
526                 snd_timer_notify1(timeri, event);
527         return 0;
528 }
529
530 /*
531  * stop the timer instance.
532  *
533  * do not call this from the timer callback!
534  */
535 int snd_timer_stop(struct snd_timer_instance *timeri)
536 {
537         struct snd_timer *timer;
538         unsigned long flags;
539         int err;
540
541         err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
542         if (err < 0)
543                 return err;
544         timer = timeri->timer;
545         spin_lock_irqsave(&timer->lock, flags);
546         timeri->cticks = timeri->ticks;
547         timeri->pticks = 0;
548         spin_unlock_irqrestore(&timer->lock, flags);
549         return 0;
550 }
551
552 /*
553  * start again..  the tick is kept.
554  */
555 int snd_timer_continue(struct snd_timer_instance *timeri)
556 {
557         struct snd_timer *timer;
558         int result = -EINVAL;
559         unsigned long flags;
560
561         if (timeri == NULL)
562                 return result;
563         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
564                 return snd_timer_start_slave(timeri);
565         timer = timeri->timer;
566         if (! timer)
567                 return -EINVAL;
568         spin_lock_irqsave(&timer->lock, flags);
569         if (!timeri->cticks)
570                 timeri->cticks = 1;
571         timeri->pticks = 0;
572         result = snd_timer_start1(timer, timeri, timer->sticks);
573         spin_unlock_irqrestore(&timer->lock, flags);
574         snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
575         return result;
576 }
577
578 /*
579  * pause.. remember the ticks left
580  */
581 int snd_timer_pause(struct snd_timer_instance * timeri)
582 {
583         return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
584 }
585
586 /*
587  * reschedule the timer
588  *
589  * start pending instances and check the scheduling ticks.
590  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
591  */
592 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
593 {
594         struct snd_timer_instance *ti;
595         unsigned long ticks = ~0UL;
596         struct list_head *p;
597
598         list_for_each(p, &timer->active_list_head) {
599                 ti = list_entry(p, struct snd_timer_instance, active_list);
600                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
601                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
602                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
603                         timer->running++;
604                 }
605                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
606                         if (ticks > ti->cticks)
607                                 ticks = ti->cticks;
608                 }
609         }
610         if (ticks == ~0UL) {
611                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
612                 return;
613         }
614         if (ticks > timer->hw.ticks)
615                 ticks = timer->hw.ticks;
616         if (ticks_left != ticks)
617                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
618         timer->sticks = ticks;
619 }
620
621 /*
622  * timer tasklet
623  *
624  */
625 static void snd_timer_tasklet(unsigned long arg)
626 {
627         struct snd_timer *timer = (struct snd_timer *) arg;
628         struct snd_timer_instance *ti;
629         struct list_head *p;
630         unsigned long resolution, ticks;
631         unsigned long flags;
632
633         spin_lock_irqsave(&timer->lock, flags);
634         /* now process all callbacks */
635         while (!list_empty(&timer->sack_list_head)) {
636                 p = timer->sack_list_head.next;         /* get first item */
637                 ti = list_entry(p, struct snd_timer_instance, ack_list);
638
639                 /* remove from ack_list and make empty */
640                 list_del_init(p);
641
642                 ticks = ti->pticks;
643                 ti->pticks = 0;
644                 resolution = ti->resolution;
645
646                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
647                 spin_unlock(&timer->lock);
648                 if (ti->callback)
649                         ti->callback(ti, resolution, ticks);
650                 spin_lock(&timer->lock);
651                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
652         }
653         spin_unlock_irqrestore(&timer->lock, flags);
654 }
655
656 /*
657  * timer interrupt
658  *
659  * ticks_left is usually equal to timer->sticks.
660  *
661  */
662 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
663 {
664         struct snd_timer_instance *ti, *ts;
665         unsigned long resolution, ticks;
666         struct list_head *p, *q, *n, *ack_list_head;
667         unsigned long flags;
668         int use_tasklet = 0;
669
670         if (timer == NULL)
671                 return;
672
673         spin_lock_irqsave(&timer->lock, flags);
674
675         /* remember the current resolution */
676         if (timer->hw.c_resolution)
677                 resolution = timer->hw.c_resolution(timer);
678         else
679                 resolution = timer->hw.resolution;
680
681         /* loop for all active instances
682          * Here we cannot use list_for_each because the active_list of a
683          * processed instance is relinked to done_list_head before the callback
684          * is called.
685          */
686         list_for_each_safe(p, n, &timer->active_list_head) {
687                 ti = list_entry(p, struct snd_timer_instance, active_list);
688                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
689                         continue;
690                 ti->pticks += ticks_left;
691                 ti->resolution = resolution;
692                 if (ti->cticks < ticks_left)
693                         ti->cticks = 0;
694                 else
695                         ti->cticks -= ticks_left;
696                 if (ti->cticks) /* not expired */
697                         continue;
698                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
699                         ti->cticks = ti->ticks;
700                 } else {
701                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
702                         if (--timer->running)
703                                 list_del(p);
704                 }
705                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
706                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
707                         ack_list_head = &timer->ack_list_head;
708                 else
709                         ack_list_head = &timer->sack_list_head;
710                 if (list_empty(&ti->ack_list))
711                         list_add_tail(&ti->ack_list, ack_list_head);
712                 list_for_each(q, &ti->slave_active_head) {
713                         ts = list_entry(q, struct snd_timer_instance, active_list);
714                         ts->pticks = ti->pticks;
715                         ts->resolution = resolution;
716                         if (list_empty(&ts->ack_list))
717                                 list_add_tail(&ts->ack_list, ack_list_head);
718                 }
719         }
720         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
721                 snd_timer_reschedule(timer, ticks_left);
722         if (timer->running) {
723                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
724                         timer->hw.stop(timer);
725                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
726                 }
727                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
728                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
729                         /* restart timer */
730                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
731                         timer->hw.start(timer);
732                 }
733         } else {
734                 timer->hw.stop(timer);
735         }
736
737         /* now process all fast callbacks */
738         while (!list_empty(&timer->ack_list_head)) {
739                 p = timer->ack_list_head.next;          /* get first item */
740                 ti = list_entry(p, struct snd_timer_instance, ack_list);
741
742                 /* remove from ack_list and make empty */
743                 list_del_init(p);
744
745                 ticks = ti->pticks;
746                 ti->pticks = 0;
747
748                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
749                 spin_unlock(&timer->lock);
750                 if (ti->callback)
751                         ti->callback(ti, resolution, ticks);
752                 spin_lock(&timer->lock);
753                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
754         }
755
756         /* do we have any slow callbacks? */
757         use_tasklet = !list_empty(&timer->sack_list_head);
758         spin_unlock_irqrestore(&timer->lock, flags);
759
760         if (use_tasklet)
761                 tasklet_hi_schedule(&timer->task_queue);
762 }
763
764 /*
765
766  */
767
768 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
769                   struct snd_timer **rtimer)
770 {
771         struct snd_timer *timer;
772         int err;
773         static struct snd_device_ops ops = {
774                 .dev_free = snd_timer_dev_free,
775                 .dev_register = snd_timer_dev_register,
776                 .dev_disconnect = snd_timer_dev_disconnect,
777         };
778
779         snd_assert(tid != NULL, return -EINVAL);
780         snd_assert(rtimer != NULL, return -EINVAL);
781         *rtimer = NULL;
782         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
783         if (timer == NULL) {
784                 snd_printk(KERN_ERR "timer: cannot allocate\n");
785                 return -ENOMEM;
786         }
787         timer->tmr_class = tid->dev_class;
788         timer->card = card;
789         timer->tmr_device = tid->device;
790         timer->tmr_subdevice = tid->subdevice;
791         if (id)
792                 strlcpy(timer->id, id, sizeof(timer->id));
793         INIT_LIST_HEAD(&timer->device_list);
794         INIT_LIST_HEAD(&timer->open_list_head);
795         INIT_LIST_HEAD(&timer->active_list_head);
796         INIT_LIST_HEAD(&timer->ack_list_head);
797         INIT_LIST_HEAD(&timer->sack_list_head);
798         spin_lock_init(&timer->lock);
799         tasklet_init(&timer->task_queue, snd_timer_tasklet,
800                      (unsigned long)timer);
801         if (card != NULL) {
802                 timer->module = card->module;
803                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
804                 if (err < 0) {
805                         snd_timer_free(timer);
806                         return err;
807                 }
808         }
809         *rtimer = timer;
810         return 0;
811 }
812
813 static int snd_timer_free(struct snd_timer *timer)
814 {
815         snd_assert(timer != NULL, return -ENXIO);
816
817         mutex_lock(&register_mutex);
818         if (! list_empty(&timer->open_list_head)) {
819                 struct list_head *p, *n;
820                 struct snd_timer_instance *ti;
821                 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
822                 list_for_each_safe(p, n, &timer->open_list_head) {
823                         list_del_init(p);
824                         ti = list_entry(p, struct snd_timer_instance, open_list);
825                         ti->timer = NULL;
826                 }
827         }
828         list_del(&timer->device_list);
829         mutex_unlock(&register_mutex);
830
831         if (timer->private_free)
832                 timer->private_free(timer);
833         kfree(timer);
834         return 0;
835 }
836
837 static int snd_timer_dev_free(struct snd_device *device)
838 {
839         struct snd_timer *timer = device->device_data;
840         return snd_timer_free(timer);
841 }
842
843 static int snd_timer_dev_register(struct snd_device *dev)
844 {
845         struct snd_timer *timer = dev->device_data;
846         struct snd_timer *timer1;
847         struct list_head *p;
848
849         snd_assert(timer != NULL && timer->hw.start != NULL &&
850                    timer->hw.stop != NULL, return -ENXIO);
851         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
852             !timer->hw.resolution && timer->hw.c_resolution == NULL)
853                 return -EINVAL;
854
855         mutex_lock(&register_mutex);
856         list_for_each(p, &snd_timer_list) {
857                 timer1 = list_entry(p, struct snd_timer, device_list);
858                 if (timer1->tmr_class > timer->tmr_class)
859                         break;
860                 if (timer1->tmr_class < timer->tmr_class)
861                         continue;
862                 if (timer1->card && timer->card) {
863                         if (timer1->card->number > timer->card->number)
864                                 break;
865                         if (timer1->card->number < timer->card->number)
866                                 continue;
867                 }
868                 if (timer1->tmr_device > timer->tmr_device)
869                         break;
870                 if (timer1->tmr_device < timer->tmr_device)
871                         continue;
872                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
873                         break;
874                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
875                         continue;
876                 /* conflicts.. */
877                 mutex_unlock(&register_mutex);
878                 return -EBUSY;
879         }
880         list_add_tail(&timer->device_list, p);
881         mutex_unlock(&register_mutex);
882         return 0;
883 }
884
885 static int snd_timer_dev_disconnect(struct snd_device *device)
886 {
887         struct snd_timer *timer = device->device_data;
888         mutex_lock(&register_mutex);
889         list_del_init(&timer->device_list);
890         mutex_unlock(&register_mutex);
891         return 0;
892 }
893
894 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
895 {
896         unsigned long flags;
897         unsigned long resolution = 0;
898         struct snd_timer_instance *ti, *ts;
899         struct list_head *p, *n;
900
901         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
902                 return;
903         snd_assert(event >= SNDRV_TIMER_EVENT_MSTART &&
904                    event <= SNDRV_TIMER_EVENT_MRESUME, return);
905         spin_lock_irqsave(&timer->lock, flags);
906         if (event == SNDRV_TIMER_EVENT_MSTART ||
907             event == SNDRV_TIMER_EVENT_MCONTINUE ||
908             event == SNDRV_TIMER_EVENT_MRESUME) {
909                 if (timer->hw.c_resolution)
910                         resolution = timer->hw.c_resolution(timer);
911                 else
912                         resolution = timer->hw.resolution;
913         }
914         list_for_each(p, &timer->active_list_head) {
915                 ti = list_entry(p, struct snd_timer_instance, active_list);
916                 if (ti->ccallback)
917                         ti->ccallback(ti, event, tstamp, resolution);
918                 list_for_each(n, &ti->slave_active_head) {
919                         ts = list_entry(n, struct snd_timer_instance, active_list);
920                         if (ts->ccallback)
921                                 ts->ccallback(ts, event, tstamp, resolution);
922                 }
923         }
924         spin_unlock_irqrestore(&timer->lock, flags);
925 }
926
927 /*
928  * exported functions for global timers
929  */
930 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
931 {
932         struct snd_timer_id tid;
933
934         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
935         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
936         tid.card = -1;
937         tid.device = device;
938         tid.subdevice = 0;
939         return snd_timer_new(NULL, id, &tid, rtimer);
940 }
941
942 int snd_timer_global_free(struct snd_timer *timer)
943 {
944         return snd_timer_free(timer);
945 }
946
947 int snd_timer_global_register(struct snd_timer *timer)
948 {
949         struct snd_device dev;
950
951         memset(&dev, 0, sizeof(dev));
952         dev.device_data = timer;
953         return snd_timer_dev_register(&dev);
954 }
955
956 /*
957  *  System timer
958  */
959
960 struct snd_timer_system_private {
961         struct timer_list tlist;
962         struct timer * timer;
963         unsigned long last_expires;
964         unsigned long last_jiffies;
965         unsigned long correction;
966 };
967
968 static void snd_timer_s_function(unsigned long data)
969 {
970         struct snd_timer *timer = (struct snd_timer *)data;
971         struct snd_timer_system_private *priv = timer->private_data;
972         unsigned long jiff = jiffies;
973         if (time_after(jiff, priv->last_expires))
974                 priv->correction += (long)jiff - (long)priv->last_expires;
975         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
976 }
977
978 static int snd_timer_s_start(struct snd_timer * timer)
979 {
980         struct snd_timer_system_private *priv;
981         unsigned long njiff;
982
983         priv = (struct snd_timer_system_private *) timer->private_data;
984         njiff = (priv->last_jiffies = jiffies);
985         if (priv->correction > timer->sticks - 1) {
986                 priv->correction -= timer->sticks - 1;
987                 njiff++;
988         } else {
989                 njiff += timer->sticks - priv->correction;
990                 priv->correction = 0;
991         }
992         priv->last_expires = priv->tlist.expires = njiff;
993         add_timer(&priv->tlist);
994         return 0;
995 }
996
997 static int snd_timer_s_stop(struct snd_timer * timer)
998 {
999         struct snd_timer_system_private *priv;
1000         unsigned long jiff;
1001
1002         priv = (struct snd_timer_system_private *) timer->private_data;
1003         del_timer(&priv->tlist);
1004         jiff = jiffies;
1005         if (time_before(jiff, priv->last_expires))
1006                 timer->sticks = priv->last_expires - jiff;
1007         else
1008                 timer->sticks = 1;
1009         priv->correction = 0;
1010         return 0;
1011 }
1012
1013 static struct snd_timer_hardware snd_timer_system =
1014 {
1015         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1016         .resolution =   1000000000L / HZ,
1017         .ticks =        10000000L,
1018         .start =        snd_timer_s_start,
1019         .stop =         snd_timer_s_stop
1020 };
1021
1022 static void snd_timer_free_system(struct snd_timer *timer)
1023 {
1024         kfree(timer->private_data);
1025 }
1026
1027 static int snd_timer_register_system(void)
1028 {
1029         struct snd_timer *timer;
1030         struct snd_timer_system_private *priv;
1031         int err;
1032
1033         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1034         if (err < 0)
1035                 return err;
1036         strcpy(timer->name, "system timer");
1037         timer->hw = snd_timer_system;
1038         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1039         if (priv == NULL) {
1040                 snd_timer_free(timer);
1041                 return -ENOMEM;
1042         }
1043         init_timer(&priv->tlist);
1044         priv->tlist.function = snd_timer_s_function;
1045         priv->tlist.data = (unsigned long) timer;
1046         timer->private_data = priv;
1047         timer->private_free = snd_timer_free_system;
1048         return snd_timer_global_register(timer);
1049 }
1050
1051 #ifdef CONFIG_PROC_FS
1052 /*
1053  *  Info interface
1054  */
1055
1056 static void snd_timer_proc_read(struct snd_info_entry *entry,
1057                                 struct snd_info_buffer *buffer)
1058 {
1059         struct snd_timer *timer;
1060         struct snd_timer_instance *ti;
1061         struct list_head *p, *q;
1062
1063         mutex_lock(&register_mutex);
1064         list_for_each(p, &snd_timer_list) {
1065                 timer = list_entry(p, struct snd_timer, device_list);
1066                 switch (timer->tmr_class) {
1067                 case SNDRV_TIMER_CLASS_GLOBAL:
1068                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1069                         break;
1070                 case SNDRV_TIMER_CLASS_CARD:
1071                         snd_iprintf(buffer, "C%i-%i: ",
1072                                     timer->card->number, timer->tmr_device);
1073                         break;
1074                 case SNDRV_TIMER_CLASS_PCM:
1075                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1076                                     timer->tmr_device, timer->tmr_subdevice);
1077                         break;
1078                 default:
1079                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1080                                     timer->card ? timer->card->number : -1,
1081                                     timer->tmr_device, timer->tmr_subdevice);
1082                 }
1083                 snd_iprintf(buffer, "%s :", timer->name);
1084                 if (timer->hw.resolution)
1085                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1086                                     timer->hw.resolution / 1000,
1087                                     timer->hw.resolution % 1000,
1088                                     timer->hw.ticks);
1089                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1090                         snd_iprintf(buffer, " SLAVE");
1091                 snd_iprintf(buffer, "\n");
1092                 list_for_each(q, &timer->open_list_head) {
1093                         ti = list_entry(q, struct snd_timer_instance, open_list);
1094                         snd_iprintf(buffer, "  Client %s : %s\n",
1095                                     ti->owner ? ti->owner : "unknown",
1096                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1097                                                  SNDRV_TIMER_IFLG_RUNNING)
1098                                     ? "running" : "stopped");
1099                 }
1100         }
1101         mutex_unlock(&register_mutex);
1102 }
1103
1104 static struct snd_info_entry *snd_timer_proc_entry;
1105
1106 static void __init snd_timer_proc_init(void)
1107 {
1108         struct snd_info_entry *entry;
1109
1110         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1111         if (entry != NULL) {
1112                 entry->c.text.read = snd_timer_proc_read;
1113                 if (snd_info_register(entry) < 0) {
1114                         snd_info_free_entry(entry);
1115                         entry = NULL;
1116                 }
1117         }
1118         snd_timer_proc_entry = entry;
1119 }
1120
1121 static void __exit snd_timer_proc_done(void)
1122 {
1123         snd_info_free_entry(snd_timer_proc_entry);
1124 }
1125 #else /* !CONFIG_PROC_FS */
1126 #define snd_timer_proc_init()
1127 #define snd_timer_proc_done()
1128 #endif
1129
1130 /*
1131  *  USER SPACE interface
1132  */
1133
1134 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1135                                      unsigned long resolution,
1136                                      unsigned long ticks)
1137 {
1138         struct snd_timer_user *tu = timeri->callback_data;
1139         struct snd_timer_read *r;
1140         int prev;
1141
1142         spin_lock(&tu->qlock);
1143         if (tu->qused > 0) {
1144                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1145                 r = &tu->queue[prev];
1146                 if (r->resolution == resolution) {
1147                         r->ticks += ticks;
1148                         goto __wake;
1149                 }
1150         }
1151         if (tu->qused >= tu->queue_size) {
1152                 tu->overrun++;
1153         } else {
1154                 r = &tu->queue[tu->qtail++];
1155                 tu->qtail %= tu->queue_size;
1156                 r->resolution = resolution;
1157                 r->ticks = ticks;
1158                 tu->qused++;
1159         }
1160       __wake:
1161         spin_unlock(&tu->qlock);
1162         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1163         wake_up(&tu->qchange_sleep);
1164 }
1165
1166 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1167                                             struct snd_timer_tread *tread)
1168 {
1169         if (tu->qused >= tu->queue_size) {
1170                 tu->overrun++;
1171         } else {
1172                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1173                 tu->qtail %= tu->queue_size;
1174                 tu->qused++;
1175         }
1176 }
1177
1178 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1179                                      int event,
1180                                      struct timespec *tstamp,
1181                                      unsigned long resolution)
1182 {
1183         struct snd_timer_user *tu = timeri->callback_data;
1184         struct snd_timer_tread r1;
1185
1186         if (event >= SNDRV_TIMER_EVENT_START &&
1187             event <= SNDRV_TIMER_EVENT_PAUSE)
1188                 tu->tstamp = *tstamp;
1189         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1190                 return;
1191         r1.event = event;
1192         r1.tstamp = *tstamp;
1193         r1.val = resolution;
1194         spin_lock(&tu->qlock);
1195         snd_timer_user_append_to_tqueue(tu, &r1);
1196         spin_unlock(&tu->qlock);
1197         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1198         wake_up(&tu->qchange_sleep);
1199 }
1200
1201 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1202                                       unsigned long resolution,
1203                                       unsigned long ticks)
1204 {
1205         struct snd_timer_user *tu = timeri->callback_data;
1206         struct snd_timer_tread *r, r1;
1207         struct timespec tstamp;
1208         int prev, append = 0;
1209
1210         memset(&tstamp, 0, sizeof(tstamp));
1211         spin_lock(&tu->qlock);
1212         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1213                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1214                 spin_unlock(&tu->qlock);
1215                 return;
1216         }
1217         if (tu->last_resolution != resolution || ticks > 0)
1218                 getnstimeofday(&tstamp);
1219         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1220             tu->last_resolution != resolution) {
1221                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1222                 r1.tstamp = tstamp;
1223                 r1.val = resolution;
1224                 snd_timer_user_append_to_tqueue(tu, &r1);
1225                 tu->last_resolution = resolution;
1226                 append++;
1227         }
1228         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1229                 goto __wake;
1230         if (ticks == 0)
1231                 goto __wake;
1232         if (tu->qused > 0) {
1233                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1234                 r = &tu->tqueue[prev];
1235                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1236                         r->tstamp = tstamp;
1237                         r->val += ticks;
1238                         append++;
1239                         goto __wake;
1240                 }
1241         }
1242         r1.event = SNDRV_TIMER_EVENT_TICK;
1243         r1.tstamp = tstamp;
1244         r1.val = ticks;
1245         snd_timer_user_append_to_tqueue(tu, &r1);
1246         append++;
1247       __wake:
1248         spin_unlock(&tu->qlock);
1249         if (append == 0)
1250                 return;
1251         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1252         wake_up(&tu->qchange_sleep);
1253 }
1254
1255 static int snd_timer_user_open(struct inode *inode, struct file *file)
1256 {
1257         struct snd_timer_user *tu;
1258
1259         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1260         if (tu == NULL)
1261                 return -ENOMEM;
1262         spin_lock_init(&tu->qlock);
1263         init_waitqueue_head(&tu->qchange_sleep);
1264         mutex_init(&tu->tread_sem);
1265         tu->ticks = 1;
1266         tu->queue_size = 128;
1267         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1268                             GFP_KERNEL);
1269         if (tu->queue == NULL) {
1270                 kfree(tu);
1271                 return -ENOMEM;
1272         }
1273         file->private_data = tu;
1274         return 0;
1275 }
1276
1277 static int snd_timer_user_release(struct inode *inode, struct file *file)
1278 {
1279         struct snd_timer_user *tu;
1280
1281         if (file->private_data) {
1282                 tu = file->private_data;
1283                 file->private_data = NULL;
1284                 fasync_helper(-1, file, 0, &tu->fasync);
1285                 if (tu->timeri)
1286                         snd_timer_close(tu->timeri);
1287                 kfree(tu->queue);
1288                 kfree(tu->tqueue);
1289                 kfree(tu);
1290         }
1291         return 0;
1292 }
1293
1294 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1295 {
1296         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1297         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1298         id->card = -1;
1299         id->device = -1;
1300         id->subdevice = -1;
1301 }
1302
1303 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1304 {
1305         id->dev_class = timer->tmr_class;
1306         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1307         id->card = timer->card ? timer->card->number : -1;
1308         id->device = timer->tmr_device;
1309         id->subdevice = timer->tmr_subdevice;
1310 }
1311
1312 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1313 {
1314         struct snd_timer_id id;
1315         struct snd_timer *timer;
1316         struct list_head *p;
1317
1318         if (copy_from_user(&id, _tid, sizeof(id)))
1319                 return -EFAULT;
1320         mutex_lock(&register_mutex);
1321         if (id.dev_class < 0) {         /* first item */
1322                 if (list_empty(&snd_timer_list))
1323                         snd_timer_user_zero_id(&id);
1324                 else {
1325                         timer = list_entry(snd_timer_list.next,
1326                                            struct snd_timer, device_list);
1327                         snd_timer_user_copy_id(&id, timer);
1328                 }
1329         } else {
1330                 switch (id.dev_class) {
1331                 case SNDRV_TIMER_CLASS_GLOBAL:
1332                         id.device = id.device < 0 ? 0 : id.device + 1;
1333                         list_for_each(p, &snd_timer_list) {
1334                                 timer = list_entry(p, struct snd_timer, device_list);
1335                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1336                                         snd_timer_user_copy_id(&id, timer);
1337                                         break;
1338                                 }
1339                                 if (timer->tmr_device >= id.device) {
1340                                         snd_timer_user_copy_id(&id, timer);
1341                                         break;
1342                                 }
1343                         }
1344                         if (p == &snd_timer_list)
1345                                 snd_timer_user_zero_id(&id);
1346                         break;
1347                 case SNDRV_TIMER_CLASS_CARD:
1348                 case SNDRV_TIMER_CLASS_PCM:
1349                         if (id.card < 0) {
1350                                 id.card = 0;
1351                         } else {
1352                                 if (id.card < 0) {
1353                                         id.card = 0;
1354                                 } else {
1355                                         if (id.device < 0) {
1356                                                 id.device = 0;
1357                                         } else {
1358                                                 if (id.subdevice < 0) {
1359                                                         id.subdevice = 0;
1360                                                 } else {
1361                                                         id.subdevice++;
1362                                                 }
1363                                         }
1364                                 }
1365                         }
1366                         list_for_each(p, &snd_timer_list) {
1367                                 timer = list_entry(p, struct snd_timer, device_list);
1368                                 if (timer->tmr_class > id.dev_class) {
1369                                         snd_timer_user_copy_id(&id, timer);
1370                                         break;
1371                                 }
1372                                 if (timer->tmr_class < id.dev_class)
1373                                         continue;
1374                                 if (timer->card->number > id.card) {
1375                                         snd_timer_user_copy_id(&id, timer);
1376                                         break;
1377                                 }
1378                                 if (timer->card->number < id.card)
1379                                         continue;
1380                                 if (timer->tmr_device > id.device) {
1381                                         snd_timer_user_copy_id(&id, timer);
1382                                         break;
1383                                 }
1384                                 if (timer->tmr_device < id.device)
1385                                         continue;
1386                                 if (timer->tmr_subdevice > id.subdevice) {
1387                                         snd_timer_user_copy_id(&id, timer);
1388                                         break;
1389                                 }
1390                                 if (timer->tmr_subdevice < id.subdevice)
1391                                         continue;
1392                                 snd_timer_user_copy_id(&id, timer);
1393                                 break;
1394                         }
1395                         if (p == &snd_timer_list)
1396                                 snd_timer_user_zero_id(&id);
1397                         break;
1398                 default:
1399                         snd_timer_user_zero_id(&id);
1400                 }
1401         }
1402         mutex_unlock(&register_mutex);
1403         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1404                 return -EFAULT;
1405         return 0;
1406 }
1407
1408 static int snd_timer_user_ginfo(struct file *file,
1409                                 struct snd_timer_ginfo __user *_ginfo)
1410 {
1411         struct snd_timer_ginfo *ginfo;
1412         struct snd_timer_id tid;
1413         struct snd_timer *t;
1414         struct list_head *p;
1415         int err = 0;
1416
1417         ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1418         if (! ginfo)
1419                 return -ENOMEM;
1420         if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1421                 kfree(ginfo);
1422                 return -EFAULT;
1423         }
1424         tid = ginfo->tid;
1425         memset(ginfo, 0, sizeof(*ginfo));
1426         ginfo->tid = tid;
1427         mutex_lock(&register_mutex);
1428         t = snd_timer_find(&tid);
1429         if (t != NULL) {
1430                 ginfo->card = t->card ? t->card->number : -1;
1431                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1432                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1433                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1434                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1435                 ginfo->resolution = t->hw.resolution;
1436                 if (t->hw.resolution_min > 0) {
1437                         ginfo->resolution_min = t->hw.resolution_min;
1438                         ginfo->resolution_max = t->hw.resolution_max;
1439                 }
1440                 list_for_each(p, &t->open_list_head) {
1441                         ginfo->clients++;
1442                 }
1443         } else {
1444                 err = -ENODEV;
1445         }
1446         mutex_unlock(&register_mutex);
1447         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1448                 err = -EFAULT;
1449         kfree(ginfo);
1450         return err;
1451 }
1452
1453 static int snd_timer_user_gparams(struct file *file,
1454                                   struct snd_timer_gparams __user *_gparams)
1455 {
1456         struct snd_timer_gparams gparams;
1457         struct snd_timer *t;
1458         int err;
1459
1460         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1461                 return -EFAULT;
1462         mutex_lock(&register_mutex);
1463         t = snd_timer_find(&gparams.tid);
1464         if (!t) {
1465                 err = -ENODEV;
1466                 goto _error;
1467         }
1468         if (!list_empty(&t->open_list_head)) {
1469                 err = -EBUSY;
1470                 goto _error;
1471         }
1472         if (!t->hw.set_period) {
1473                 err = -ENOSYS;
1474                 goto _error;
1475         }
1476         err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1477 _error:
1478         mutex_unlock(&register_mutex);
1479         return err;
1480 }
1481
1482 static int snd_timer_user_gstatus(struct file *file,
1483                                   struct snd_timer_gstatus __user *_gstatus)
1484 {
1485         struct snd_timer_gstatus gstatus;
1486         struct snd_timer_id tid;
1487         struct snd_timer *t;
1488         int err = 0;
1489
1490         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1491                 return -EFAULT;
1492         tid = gstatus.tid;
1493         memset(&gstatus, 0, sizeof(gstatus));
1494         gstatus.tid = tid;
1495         mutex_lock(&register_mutex);
1496         t = snd_timer_find(&tid);
1497         if (t != NULL) {
1498                 if (t->hw.c_resolution)
1499                         gstatus.resolution = t->hw.c_resolution(t);
1500                 else
1501                         gstatus.resolution = t->hw.resolution;
1502                 if (t->hw.precise_resolution) {
1503                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1504                                                  &gstatus.resolution_den);
1505                 } else {
1506                         gstatus.resolution_num = gstatus.resolution;
1507                         gstatus.resolution_den = 1000000000uL;
1508                 }
1509         } else {
1510                 err = -ENODEV;
1511         }
1512         mutex_unlock(&register_mutex);
1513         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1514                 err = -EFAULT;
1515         return err;
1516 }
1517
1518 static int snd_timer_user_tselect(struct file *file,
1519                                   struct snd_timer_select __user *_tselect)
1520 {
1521         struct snd_timer_user *tu;
1522         struct snd_timer_select tselect;
1523         char str[32];
1524         int err = 0;
1525
1526         tu = file->private_data;
1527         mutex_lock(&tu->tread_sem);
1528         if (tu->timeri) {
1529                 snd_timer_close(tu->timeri);
1530                 tu->timeri = NULL;
1531         }
1532         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1533                 err = -EFAULT;
1534                 goto __err;
1535         }
1536         sprintf(str, "application %i", current->pid);
1537         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1538                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1539         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1540         if (err < 0)
1541                 goto __err;
1542
1543         kfree(tu->queue);
1544         tu->queue = NULL;
1545         kfree(tu->tqueue);
1546         tu->tqueue = NULL;
1547         if (tu->tread) {
1548                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1549                                      GFP_KERNEL);
1550                 if (tu->tqueue == NULL)
1551                         err = -ENOMEM;
1552         } else {
1553                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1554                                     GFP_KERNEL);
1555                 if (tu->queue == NULL)
1556                         err = -ENOMEM;
1557         }
1558
1559         if (err < 0) {
1560                 snd_timer_close(tu->timeri);
1561                 tu->timeri = NULL;
1562         } else {
1563                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1564                 tu->timeri->callback = tu->tread
1565                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1566                 tu->timeri->ccallback = snd_timer_user_ccallback;
1567                 tu->timeri->callback_data = (void *)tu;
1568         }
1569
1570       __err:
1571         mutex_unlock(&tu->tread_sem);
1572         return err;
1573 }
1574
1575 static int snd_timer_user_info(struct file *file,
1576                                struct snd_timer_info __user *_info)
1577 {
1578         struct snd_timer_user *tu;
1579         struct snd_timer_info *info;
1580         struct snd_timer *t;
1581         int err = 0;
1582
1583         tu = file->private_data;
1584         snd_assert(tu->timeri != NULL, return -ENXIO);
1585         t = tu->timeri->timer;
1586         snd_assert(t != NULL, return -ENXIO);
1587
1588         info = kzalloc(sizeof(*info), GFP_KERNEL);
1589         if (! info)
1590                 return -ENOMEM;
1591         info->card = t->card ? t->card->number : -1;
1592         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1593                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1594         strlcpy(info->id, t->id, sizeof(info->id));
1595         strlcpy(info->name, t->name, sizeof(info->name));
1596         info->resolution = t->hw.resolution;
1597         if (copy_to_user(_info, info, sizeof(*_info)))
1598                 err = -EFAULT;
1599         kfree(info);
1600         return err;
1601 }
1602
1603 static int snd_timer_user_params(struct file *file,
1604                                  struct snd_timer_params __user *_params)
1605 {
1606         struct snd_timer_user *tu;
1607         struct snd_timer_params params;
1608         struct snd_timer *t;
1609         struct snd_timer_read *tr;
1610         struct snd_timer_tread *ttr;
1611         int err;
1612
1613         tu = file->private_data;
1614         snd_assert(tu->timeri != NULL, return -ENXIO);
1615         t = tu->timeri->timer;
1616         snd_assert(t != NULL, return -ENXIO);
1617         if (copy_from_user(&params, _params, sizeof(params)))
1618                 return -EFAULT;
1619         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1620                 err = -EINVAL;
1621                 goto _end;
1622         }
1623         if (params.queue_size > 0 &&
1624             (params.queue_size < 32 || params.queue_size > 1024)) {
1625                 err = -EINVAL;
1626                 goto _end;
1627         }
1628         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1629                               (1<<SNDRV_TIMER_EVENT_TICK)|
1630                               (1<<SNDRV_TIMER_EVENT_START)|
1631                               (1<<SNDRV_TIMER_EVENT_STOP)|
1632                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1633                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1634                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1635                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1636                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1637                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1638                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1639                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1640                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1641                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1642                 err = -EINVAL;
1643                 goto _end;
1644         }
1645         snd_timer_stop(tu->timeri);
1646         spin_lock_irq(&t->lock);
1647         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1648                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1649                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1650         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1651                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1652         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1653                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1654         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1655                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1656         spin_unlock_irq(&t->lock);
1657         if (params.queue_size > 0 &&
1658             (unsigned int)tu->queue_size != params.queue_size) {
1659                 if (tu->tread) {
1660                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1661                                       GFP_KERNEL);
1662                         if (ttr) {
1663                                 kfree(tu->tqueue);
1664                                 tu->queue_size = params.queue_size;
1665                                 tu->tqueue = ttr;
1666                         }
1667                 } else {
1668                         tr = kmalloc(params.queue_size * sizeof(*tr),
1669                                      GFP_KERNEL);
1670                         if (tr) {
1671                                 kfree(tu->queue);
1672                                 tu->queue_size = params.queue_size;
1673                                 tu->queue = tr;
1674                         }
1675                 }
1676         }
1677         tu->qhead = tu->qtail = tu->qused = 0;
1678         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1679                 if (tu->tread) {
1680                         struct snd_timer_tread tread;
1681                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1682                         tread.tstamp.tv_sec = 0;
1683                         tread.tstamp.tv_nsec = 0;
1684                         tread.val = 0;
1685                         snd_timer_user_append_to_tqueue(tu, &tread);
1686                 } else {
1687                         struct snd_timer_read *r = &tu->queue[0];
1688                         r->resolution = 0;
1689                         r->ticks = 0;
1690                         tu->qused++;
1691                         tu->qtail++;
1692                 }
1693         }
1694         tu->filter = params.filter;
1695         tu->ticks = params.ticks;
1696         err = 0;
1697  _end:
1698         if (copy_to_user(_params, &params, sizeof(params)))
1699                 return -EFAULT;
1700         return err;
1701 }
1702
1703 static int snd_timer_user_status(struct file *file,
1704                                  struct snd_timer_status __user *_status)
1705 {
1706         struct snd_timer_user *tu;
1707         struct snd_timer_status status;
1708
1709         tu = file->private_data;
1710         snd_assert(tu->timeri != NULL, return -ENXIO);
1711         memset(&status, 0, sizeof(status));
1712         status.tstamp = tu->tstamp;
1713         status.resolution = snd_timer_resolution(tu->timeri);
1714         status.lost = tu->timeri->lost;
1715         status.overrun = tu->overrun;
1716         spin_lock_irq(&tu->qlock);
1717         status.queue = tu->qused;
1718         spin_unlock_irq(&tu->qlock);
1719         if (copy_to_user(_status, &status, sizeof(status)))
1720                 return -EFAULT;
1721         return 0;
1722 }
1723
1724 static int snd_timer_user_start(struct file *file)
1725 {
1726         int err;
1727         struct snd_timer_user *tu;
1728
1729         tu = file->private_data;
1730         snd_assert(tu->timeri != NULL, return -ENXIO);
1731         snd_timer_stop(tu->timeri);
1732         tu->timeri->lost = 0;
1733         tu->last_resolution = 0;
1734         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1735 }
1736
1737 static int snd_timer_user_stop(struct file *file)
1738 {
1739         int err;
1740         struct snd_timer_user *tu;
1741
1742         tu = file->private_data;
1743         snd_assert(tu->timeri != NULL, return -ENXIO);
1744         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1745 }
1746
1747 static int snd_timer_user_continue(struct file *file)
1748 {
1749         int err;
1750         struct snd_timer_user *tu;
1751
1752         tu = file->private_data;
1753         snd_assert(tu->timeri != NULL, return -ENXIO);
1754         tu->timeri->lost = 0;
1755         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1756 }
1757
1758 static int snd_timer_user_pause(struct file *file)
1759 {
1760         int err;
1761         struct snd_timer_user *tu;
1762
1763         tu = file->private_data;
1764         snd_assert(tu->timeri != NULL, return -ENXIO);
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         int err;
1839
1840         tu = file->private_data;
1841         err = fasync_helper(fd, file, on, &tu->fasync);
1842         if (err < 0)
1843                 return err;
1844         return 0;
1845 }
1846
1847 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1848                                    size_t count, loff_t *offset)
1849 {
1850         struct snd_timer_user *tu;
1851         long result = 0, unit;
1852         int err = 0;
1853
1854         tu = file->private_data;
1855         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1856         spin_lock_irq(&tu->qlock);
1857         while ((long)count - result >= unit) {
1858                 while (!tu->qused) {
1859                         wait_queue_t wait;
1860
1861                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1862                                 err = -EAGAIN;
1863                                 break;
1864                         }
1865
1866                         set_current_state(TASK_INTERRUPTIBLE);
1867                         init_waitqueue_entry(&wait, current);
1868                         add_wait_queue(&tu->qchange_sleep, &wait);
1869
1870                         spin_unlock_irq(&tu->qlock);
1871                         schedule();
1872                         spin_lock_irq(&tu->qlock);
1873
1874                         remove_wait_queue(&tu->qchange_sleep, &wait);
1875
1876                         if (signal_pending(current)) {
1877                                 err = -ERESTARTSYS;
1878                                 break;
1879                         }
1880                 }
1881
1882                 spin_unlock_irq(&tu->qlock);
1883                 if (err < 0)
1884                         goto _error;
1885
1886                 if (tu->tread) {
1887                         if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1888                                          sizeof(struct snd_timer_tread))) {
1889                                 err = -EFAULT;
1890                                 goto _error;
1891                         }
1892                 } else {
1893                         if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1894                                          sizeof(struct snd_timer_read))) {
1895                                 err = -EFAULT;
1896                                 goto _error;
1897                         }
1898                 }
1899
1900                 tu->qhead %= tu->queue_size;
1901
1902                 result += unit;
1903                 buffer += unit;
1904
1905                 spin_lock_irq(&tu->qlock);
1906                 tu->qused--;
1907         }
1908         spin_unlock_irq(&tu->qlock);
1909  _error:
1910         return result > 0 ? result : err;
1911 }
1912
1913 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1914 {
1915         unsigned int mask;
1916         struct snd_timer_user *tu;
1917
1918         tu = file->private_data;
1919
1920         poll_wait(file, &tu->qchange_sleep, wait);
1921
1922         mask = 0;
1923         if (tu->qused)
1924                 mask |= POLLIN | POLLRDNORM;
1925
1926         return mask;
1927 }
1928
1929 #ifdef CONFIG_COMPAT
1930 #include "timer_compat.c"
1931 #else
1932 #define snd_timer_user_ioctl_compat     NULL
1933 #endif
1934
1935 static struct file_operations snd_timer_f_ops =
1936 {
1937         .owner =        THIS_MODULE,
1938         .read =         snd_timer_user_read,
1939         .open =         snd_timer_user_open,
1940         .release =      snd_timer_user_release,
1941         .poll =         snd_timer_user_poll,
1942         .unlocked_ioctl =       snd_timer_user_ioctl,
1943         .compat_ioctl = snd_timer_user_ioctl_compat,
1944         .fasync =       snd_timer_user_fasync,
1945 };
1946
1947 /*
1948  *  ENTRY functions
1949  */
1950
1951 static int __init alsa_timer_init(void)
1952 {
1953         int err;
1954
1955 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1956         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1957                               "system timer");
1958 #endif
1959
1960         if ((err = snd_timer_register_system()) < 0)
1961                 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1962                            err);
1963         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1964                                        &snd_timer_f_ops, NULL, "timer")) < 0)
1965                 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1966                            err);
1967         snd_timer_proc_init();
1968         return 0;
1969 }
1970
1971 static void __exit alsa_timer_exit(void)
1972 {
1973         struct list_head *p, *n;
1974
1975         snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1976         /* unregister the system timer */
1977         list_for_each_safe(p, n, &snd_timer_list) {
1978                 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1979                 snd_timer_free(timer);
1980         }
1981         snd_timer_proc_done();
1982 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
1983         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1984 #endif
1985 }
1986
1987 module_init(alsa_timer_init)
1988 module_exit(alsa_timer_exit)
1989
1990 EXPORT_SYMBOL(snd_timer_open);
1991 EXPORT_SYMBOL(snd_timer_close);
1992 EXPORT_SYMBOL(snd_timer_resolution);
1993 EXPORT_SYMBOL(snd_timer_start);
1994 EXPORT_SYMBOL(snd_timer_stop);
1995 EXPORT_SYMBOL(snd_timer_continue);
1996 EXPORT_SYMBOL(snd_timer_pause);
1997 EXPORT_SYMBOL(snd_timer_new);
1998 EXPORT_SYMBOL(snd_timer_notify);
1999 EXPORT_SYMBOL(snd_timer_global_new);
2000 EXPORT_SYMBOL(snd_timer_global_free);
2001 EXPORT_SYMBOL(snd_timer_global_register);
2002 EXPORT_SYMBOL(snd_timer_interrupt);