Root/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_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE)
38#define DEFAULT_TIMER_LIMIT 4
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
45static int timer_limit = DEFAULT_TIMER_LIMIT;
46static int timer_tstamp_monotonic = 1;
47MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
48MODULE_DESCRIPTION("ALSA timer interface");
49MODULE_LICENSE("GPL");
50module_param(timer_limit, int, 0444);
51MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
52module_param(timer_tstamp_monotonic, int, 0444);
53MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
54
55MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
56MODULE_ALIAS("devname:snd/timer");
57
58struct snd_timer_user {
59    struct snd_timer_instance *timeri;
60    int tread; /* enhanced read with timestamps and events */
61    unsigned long ticks;
62    unsigned long overrun;
63    int qhead;
64    int qtail;
65    int qused;
66    int queue_size;
67    struct snd_timer_read *queue;
68    struct snd_timer_tread *tqueue;
69    spinlock_t qlock;
70    unsigned long last_resolution;
71    unsigned int filter;
72    struct timespec tstamp; /* trigger tstamp */
73    wait_queue_head_t qchange_sleep;
74    struct fasync_struct *fasync;
75    struct mutex tread_sem;
76};
77
78/* list of timers */
79static LIST_HEAD(snd_timer_list);
80
81/* list of slave instances */
82static LIST_HEAD(snd_timer_slave_list);
83
84/* lock for slave active lists */
85static DEFINE_SPINLOCK(slave_active_lock);
86
87static DEFINE_MUTEX(register_mutex);
88
89static int snd_timer_free(struct snd_timer *timer);
90static int snd_timer_dev_free(struct snd_device *device);
91static int snd_timer_dev_register(struct snd_device *device);
92static int snd_timer_dev_disconnect(struct snd_device *device);
93
94static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
95
96/*
97 * create a timer instance with the given owner string.
98 * when timer is not NULL, increments the module counter
99 */
100static struct snd_timer_instance *snd_timer_instance_new(char *owner,
101                             struct snd_timer *timer)
102{
103    struct snd_timer_instance *timeri;
104    timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
105    if (timeri == NULL)
106        return NULL;
107    timeri->owner = kstrdup(owner, GFP_KERNEL);
108    if (! timeri->owner) {
109        kfree(timeri);
110        return NULL;
111    }
112    INIT_LIST_HEAD(&timeri->open_list);
113    INIT_LIST_HEAD(&timeri->active_list);
114    INIT_LIST_HEAD(&timeri->ack_list);
115    INIT_LIST_HEAD(&timeri->slave_list_head);
116    INIT_LIST_HEAD(&timeri->slave_active_head);
117
118    timeri->timer = timer;
119    if (timer && !try_module_get(timer->module)) {
120        kfree(timeri->owner);
121        kfree(timeri);
122        return NULL;
123    }
124
125    return timeri;
126}
127
128/*
129 * find a timer instance from the given timer id
130 */
131static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
132{
133    struct snd_timer *timer = NULL;
134
135    list_for_each_entry(timer, &snd_timer_list, device_list) {
136        if (timer->tmr_class != tid->dev_class)
137            continue;
138        if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
139             timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
140            (timer->card == NULL ||
141             timer->card->number != tid->card))
142            continue;
143        if (timer->tmr_device != tid->device)
144            continue;
145        if (timer->tmr_subdevice != tid->subdevice)
146            continue;
147        return timer;
148    }
149    return NULL;
150}
151
152#ifdef CONFIG_MODULES
153
154static void snd_timer_request(struct snd_timer_id *tid)
155{
156    switch (tid->dev_class) {
157    case SNDRV_TIMER_CLASS_GLOBAL:
158        if (tid->device < timer_limit)
159            request_module("snd-timer-%i", tid->device);
160        break;
161    case SNDRV_TIMER_CLASS_CARD:
162    case SNDRV_TIMER_CLASS_PCM:
163        if (tid->card < snd_ecards_limit)
164            request_module("snd-card-%i", tid->card);
165        break;
166    default:
167        break;
168    }
169}
170
171#endif
172
173/*
174 * look for a master instance matching with the slave id of the given slave.
175 * when found, relink the open_link of the slave.
176 *
177 * call this with register_mutex down.
178 */
179static void snd_timer_check_slave(struct snd_timer_instance *slave)
180{
181    struct snd_timer *timer;
182    struct snd_timer_instance *master;
183
184    /* FIXME: it's really dumb to look up all entries.. */
185    list_for_each_entry(timer, &snd_timer_list, device_list) {
186        list_for_each_entry(master, &timer->open_list_head, open_list) {
187            if (slave->slave_class == master->slave_class &&
188                slave->slave_id == master->slave_id) {
189                list_move_tail(&slave->open_list,
190                           &master->slave_list_head);
191                spin_lock_irq(&slave_active_lock);
192                slave->master = master;
193                slave->timer = master->timer;
194                spin_unlock_irq(&slave_active_lock);
195                return;
196            }
197        }
198    }
199}
200
201/*
202 * look for slave instances matching with the slave id of the given master.
203 * when found, relink the open_link of slaves.
204 *
205 * call this with register_mutex down.
206 */
207static void snd_timer_check_master(struct snd_timer_instance *master)
208{
209    struct snd_timer_instance *slave, *tmp;
210
211    /* check all pending slaves */
212    list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
213        if (slave->slave_class == master->slave_class &&
214            slave->slave_id == master->slave_id) {
215            list_move_tail(&slave->open_list, &master->slave_list_head);
216            spin_lock_irq(&slave_active_lock);
217            slave->master = master;
218            slave->timer = master->timer;
219            if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
220                list_add_tail(&slave->active_list,
221                          &master->slave_active_head);
222            spin_unlock_irq(&slave_active_lock);
223        }
224    }
225}
226
227/*
228 * open a timer instance
229 * when opening a master, the slave id must be here given.
230 */
231int snd_timer_open(struct snd_timer_instance **ti,
232           char *owner, struct snd_timer_id *tid,
233           unsigned int slave_id)
234{
235    struct snd_timer *timer;
236    struct snd_timer_instance *timeri = NULL;
237
238    if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
239        /* open a slave instance */
240        if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
241            tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
242            snd_printd("invalid slave class %i\n", tid->dev_sclass);
243            return -EINVAL;
244        }
245        mutex_lock(&register_mutex);
246        timeri = snd_timer_instance_new(owner, NULL);
247        if (!timeri) {
248            mutex_unlock(&register_mutex);
249            return -ENOMEM;
250        }
251        timeri->slave_class = tid->dev_sclass;
252        timeri->slave_id = tid->device;
253        timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
254        list_add_tail(&timeri->open_list, &snd_timer_slave_list);
255        snd_timer_check_slave(timeri);
256        mutex_unlock(&register_mutex);
257        *ti = timeri;
258        return 0;
259    }
260
261    /* open a master instance */
262    mutex_lock(&register_mutex);
263    timer = snd_timer_find(tid);
264#ifdef CONFIG_MODULES
265    if (!timer) {
266        mutex_unlock(&register_mutex);
267        snd_timer_request(tid);
268        mutex_lock(&register_mutex);
269        timer = snd_timer_find(tid);
270    }
271#endif
272    if (!timer) {
273        mutex_unlock(&register_mutex);
274        return -ENODEV;
275    }
276    if (!list_empty(&timer->open_list_head)) {
277        timeri = list_entry(timer->open_list_head.next,
278                    struct snd_timer_instance, open_list);
279        if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
280            mutex_unlock(&register_mutex);
281            return -EBUSY;
282        }
283    }
284    timeri = snd_timer_instance_new(owner, timer);
285    if (!timeri) {
286        mutex_unlock(&register_mutex);
287        return -ENOMEM;
288    }
289    timeri->slave_class = tid->dev_sclass;
290    timeri->slave_id = slave_id;
291    if (list_empty(&timer->open_list_head) && timer->hw.open)
292        timer->hw.open(timer);
293    list_add_tail(&timeri->open_list, &timer->open_list_head);
294    snd_timer_check_master(timeri);
295    mutex_unlock(&register_mutex);
296    *ti = timeri;
297    return 0;
298}
299
300static int _snd_timer_stop(struct snd_timer_instance *timeri,
301               int keep_flag, int event);
302
303/*
304 * close a timer instance
305 */
306int snd_timer_close(struct snd_timer_instance *timeri)
307{
308    struct snd_timer *timer = NULL;
309    struct snd_timer_instance *slave, *tmp;
310
311    if (snd_BUG_ON(!timeri))
312        return -ENXIO;
313
314    /* force to stop the timer */
315    snd_timer_stop(timeri);
316
317    if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
318        /* wait, until the active callback is finished */
319        spin_lock_irq(&slave_active_lock);
320        while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
321            spin_unlock_irq(&slave_active_lock);
322            udelay(10);
323            spin_lock_irq(&slave_active_lock);
324        }
325        spin_unlock_irq(&slave_active_lock);
326        mutex_lock(&register_mutex);
327        list_del(&timeri->open_list);
328        mutex_unlock(&register_mutex);
329    } else {
330        timer = timeri->timer;
331        if (snd_BUG_ON(!timer))
332            goto out;
333        /* wait, until the active callback is finished */
334        spin_lock_irq(&timer->lock);
335        while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
336            spin_unlock_irq(&timer->lock);
337            udelay(10);
338            spin_lock_irq(&timer->lock);
339        }
340        spin_unlock_irq(&timer->lock);
341        mutex_lock(&register_mutex);
342        list_del(&timeri->open_list);
343        if (timer && list_empty(&timer->open_list_head) &&
344            timer->hw.close)
345            timer->hw.close(timer);
346        /* remove slave links */
347        list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
348                     open_list) {
349            spin_lock_irq(&slave_active_lock);
350            _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
351            list_move_tail(&slave->open_list, &snd_timer_slave_list);
352            slave->master = NULL;
353            slave->timer = NULL;
354            spin_unlock_irq(&slave_active_lock);
355        }
356        mutex_unlock(&register_mutex);
357    }
358 out:
359    if (timeri->private_free)
360        timeri->private_free(timeri);
361    kfree(timeri->owner);
362    kfree(timeri);
363    if (timer)
364        module_put(timer->module);
365    return 0;
366}
367
368unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
369{
370    struct snd_timer * timer;
371
372    if (timeri == NULL)
373        return 0;
374    if ((timer = timeri->timer) != NULL) {
375        if (timer->hw.c_resolution)
376            return timer->hw.c_resolution(timer);
377        return timer->hw.resolution;
378    }
379    return 0;
380}
381
382static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
383{
384    struct snd_timer *timer;
385    unsigned long flags;
386    unsigned long resolution = 0;
387    struct snd_timer_instance *ts;
388    struct timespec tstamp;
389
390    if (timer_tstamp_monotonic)
391        do_posix_clock_monotonic_gettime(&tstamp);
392    else
393        getnstimeofday(&tstamp);
394    if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
395               event > SNDRV_TIMER_EVENT_PAUSE))
396        return;
397    if (event == SNDRV_TIMER_EVENT_START ||
398        event == SNDRV_TIMER_EVENT_CONTINUE)
399        resolution = snd_timer_resolution(ti);
400    if (ti->ccallback)
401        ti->ccallback(ti, event, &tstamp, resolution);
402    if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
403        return;
404    timer = ti->timer;
405    if (timer == NULL)
406        return;
407    if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
408        return;
409    spin_lock_irqsave(&timer->lock, flags);
410    list_for_each_entry(ts, &ti->slave_active_head, active_list)
411        if (ts->ccallback)
412            ts->ccallback(ti, event + 100, &tstamp, resolution);
413    spin_unlock_irqrestore(&timer->lock, flags);
414}
415
416static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
417                unsigned long sticks)
418{
419    list_move_tail(&timeri->active_list, &timer->active_list_head);
420    if (timer->running) {
421        if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
422            goto __start_now;
423        timer->flags |= SNDRV_TIMER_FLG_RESCHED;
424        timeri->flags |= SNDRV_TIMER_IFLG_START;
425        return 1; /* delayed start */
426    } else {
427        timer->sticks = sticks;
428        timer->hw.start(timer);
429          __start_now:
430        timer->running++;
431        timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
432        return 0;
433    }
434}
435
436static int snd_timer_start_slave(struct snd_timer_instance *timeri)
437{
438    unsigned long flags;
439
440    spin_lock_irqsave(&slave_active_lock, flags);
441    timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
442    if (timeri->master)
443        list_add_tail(&timeri->active_list,
444                  &timeri->master->slave_active_head);
445    spin_unlock_irqrestore(&slave_active_lock, flags);
446    return 1; /* delayed start */
447}
448
449/*
450 * start the timer instance
451 */
452int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
453{
454    struct snd_timer *timer;
455    int result = -EINVAL;
456    unsigned long flags;
457
458    if (timeri == NULL || ticks < 1)
459        return -EINVAL;
460    if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
461        result = snd_timer_start_slave(timeri);
462        snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
463        return result;
464    }
465    timer = timeri->timer;
466    if (timer == NULL)
467        return -EINVAL;
468    spin_lock_irqsave(&timer->lock, flags);
469    timeri->ticks = timeri->cticks = ticks;
470    timeri->pticks = 0;
471    result = snd_timer_start1(timer, timeri, ticks);
472    spin_unlock_irqrestore(&timer->lock, flags);
473    snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
474    return result;
475}
476
477static int _snd_timer_stop(struct snd_timer_instance * timeri,
478               int keep_flag, int event)
479{
480    struct snd_timer *timer;
481    unsigned long flags;
482
483    if (snd_BUG_ON(!timeri))
484        return -ENXIO;
485
486    if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
487        if (!keep_flag) {
488            spin_lock_irqsave(&slave_active_lock, flags);
489            timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
490            spin_unlock_irqrestore(&slave_active_lock, flags);
491        }
492        goto __end;
493    }
494    timer = timeri->timer;
495    if (!timer)
496        return -EINVAL;
497    spin_lock_irqsave(&timer->lock, flags);
498    list_del_init(&timeri->ack_list);
499    list_del_init(&timeri->active_list);
500    if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
501        !(--timer->running)) {
502        timer->hw.stop(timer);
503        if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
504            timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
505            snd_timer_reschedule(timer, 0);
506            if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
507                timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
508                timer->hw.start(timer);
509            }
510        }
511    }
512    if (!keep_flag)
513        timeri->flags &=
514            ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
515    spin_unlock_irqrestore(&timer->lock, flags);
516      __end:
517    if (event != SNDRV_TIMER_EVENT_RESOLUTION)
518        snd_timer_notify1(timeri, event);
519    return 0;
520}
521
522/*
523 * stop the timer instance.
524 *
525 * do not call this from the timer callback!
526 */
527int snd_timer_stop(struct snd_timer_instance *timeri)
528{
529    struct snd_timer *timer;
530    unsigned long flags;
531    int err;
532
533    err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
534    if (err < 0)
535        return err;
536    timer = timeri->timer;
537    if (!timer)
538        return -EINVAL;
539    spin_lock_irqsave(&timer->lock, flags);
540    timeri->cticks = timeri->ticks;
541    timeri->pticks = 0;
542    spin_unlock_irqrestore(&timer->lock, flags);
543    return 0;
544}
545
546/*
547 * start again.. the tick is kept.
548 */
549int snd_timer_continue(struct snd_timer_instance *timeri)
550{
551    struct snd_timer *timer;
552    int result = -EINVAL;
553    unsigned long flags;
554
555    if (timeri == NULL)
556        return result;
557    if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
558        return snd_timer_start_slave(timeri);
559    timer = timeri->timer;
560    if (! timer)
561        return -EINVAL;
562    spin_lock_irqsave(&timer->lock, flags);
563    if (!timeri->cticks)
564        timeri->cticks = 1;
565    timeri->pticks = 0;
566    result = snd_timer_start1(timer, timeri, timer->sticks);
567    spin_unlock_irqrestore(&timer->lock, flags);
568    snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
569    return result;
570}
571
572/*
573 * pause.. remember the ticks left
574 */
575int snd_timer_pause(struct snd_timer_instance * timeri)
576{
577    return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
578}
579
580/*
581 * reschedule the timer
582 *
583 * start pending instances and check the scheduling ticks.
584 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
585 */
586static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
587{
588    struct snd_timer_instance *ti;
589    unsigned long ticks = ~0UL;
590
591    list_for_each_entry(ti, &timer->active_list_head, active_list) {
592        if (ti->flags & SNDRV_TIMER_IFLG_START) {
593            ti->flags &= ~SNDRV_TIMER_IFLG_START;
594            ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
595            timer->running++;
596        }
597        if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
598            if (ticks > ti->cticks)
599                ticks = ti->cticks;
600        }
601    }
602    if (ticks == ~0UL) {
603        timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
604        return;
605    }
606    if (ticks > timer->hw.ticks)
607        ticks = timer->hw.ticks;
608    if (ticks_left != ticks)
609        timer->flags |= SNDRV_TIMER_FLG_CHANGE;
610    timer->sticks = ticks;
611}
612
613/*
614 * timer tasklet
615 *
616 */
617static void snd_timer_tasklet(unsigned long arg)
618{
619    struct snd_timer *timer = (struct snd_timer *) arg;
620    struct snd_timer_instance *ti;
621    struct list_head *p;
622    unsigned long resolution, ticks;
623    unsigned long flags;
624
625    spin_lock_irqsave(&timer->lock, flags);
626    /* now process all callbacks */
627    while (!list_empty(&timer->sack_list_head)) {
628        p = timer->sack_list_head.next; /* get first item */
629        ti = list_entry(p, struct snd_timer_instance, ack_list);
630
631        /* remove from ack_list and make empty */
632        list_del_init(p);
633
634        ticks = ti->pticks;
635        ti->pticks = 0;
636        resolution = ti->resolution;
637
638        ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
639        spin_unlock(&timer->lock);
640        if (ti->callback)
641            ti->callback(ti, resolution, ticks);
642        spin_lock(&timer->lock);
643        ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
644    }
645    spin_unlock_irqrestore(&timer->lock, flags);
646}
647
648/*
649 * timer interrupt
650 *
651 * ticks_left is usually equal to timer->sticks.
652 *
653 */
654void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
655{
656    struct snd_timer_instance *ti, *ts, *tmp;
657    unsigned long resolution, ticks;
658    struct list_head *p, *ack_list_head;
659    unsigned long flags;
660    int use_tasklet = 0;
661
662    if (timer == NULL)
663        return;
664
665    spin_lock_irqsave(&timer->lock, flags);
666
667    /* remember the current resolution */
668    if (timer->hw.c_resolution)
669        resolution = timer->hw.c_resolution(timer);
670    else
671        resolution = timer->hw.resolution;
672
673    /* loop for all active instances
674     * Here we cannot use list_for_each_entry because the active_list of a
675     * processed instance is relinked to done_list_head before the callback
676     * is called.
677     */
678    list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
679                 active_list) {
680        if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
681            continue;
682        ti->pticks += ticks_left;
683        ti->resolution = resolution;
684        if (ti->cticks < ticks_left)
685            ti->cticks = 0;
686        else
687            ti->cticks -= ticks_left;
688        if (ti->cticks) /* not expired */
689            continue;
690        if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
691            ti->cticks = ti->ticks;
692        } else {
693            ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
694            if (--timer->running)
695                list_del(&ti->active_list);
696        }
697        if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
698            (ti->flags & SNDRV_TIMER_IFLG_FAST))
699            ack_list_head = &timer->ack_list_head;
700        else
701            ack_list_head = &timer->sack_list_head;
702        if (list_empty(&ti->ack_list))
703            list_add_tail(&ti->ack_list, ack_list_head);
704        list_for_each_entry(ts, &ti->slave_active_head, active_list) {
705            ts->pticks = ti->pticks;
706            ts->resolution = resolution;
707            if (list_empty(&ts->ack_list))
708                list_add_tail(&ts->ack_list, ack_list_head);
709        }
710    }
711    if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
712        snd_timer_reschedule(timer, timer->sticks);
713    if (timer->running) {
714        if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
715            timer->hw.stop(timer);
716            timer->flags |= SNDRV_TIMER_FLG_CHANGE;
717        }
718        if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
719            (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
720            /* restart timer */
721            timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
722            timer->hw.start(timer);
723        }
724    } else {
725        timer->hw.stop(timer);
726    }
727
728    /* now process all fast callbacks */
729    while (!list_empty(&timer->ack_list_head)) {
730        p = timer->ack_list_head.next; /* get first item */
731        ti = list_entry(p, struct snd_timer_instance, ack_list);
732
733        /* remove from ack_list and make empty */
734        list_del_init(p);
735
736        ticks = ti->pticks;
737        ti->pticks = 0;
738
739        ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
740        spin_unlock(&timer->lock);
741        if (ti->callback)
742            ti->callback(ti, resolution, ticks);
743        spin_lock(&timer->lock);
744        ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
745    }
746
747    /* do we have any slow callbacks? */
748    use_tasklet = !list_empty(&timer->sack_list_head);
749    spin_unlock_irqrestore(&timer->lock, flags);
750
751    if (use_tasklet)
752        tasklet_schedule(&timer->task_queue);
753}
754
755/*
756
757 */
758
759int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
760          struct snd_timer **rtimer)
761{
762    struct snd_timer *timer;
763    int err;
764    static struct snd_device_ops ops = {
765        .dev_free = snd_timer_dev_free,
766        .dev_register = snd_timer_dev_register,
767        .dev_disconnect = snd_timer_dev_disconnect,
768    };
769
770    if (snd_BUG_ON(!tid))
771        return -EINVAL;
772    if (rtimer)
773        *rtimer = NULL;
774    timer = kzalloc(sizeof(*timer), GFP_KERNEL);
775    if (timer == NULL) {
776        snd_printk(KERN_ERR "timer: cannot allocate\n");
777        return -ENOMEM;
778    }
779    timer->tmr_class = tid->dev_class;
780    timer->card = card;
781    timer->tmr_device = tid->device;
782    timer->tmr_subdevice = tid->subdevice;
783    if (id)
784        strlcpy(timer->id, id, sizeof(timer->id));
785    INIT_LIST_HEAD(&timer->device_list);
786    INIT_LIST_HEAD(&timer->open_list_head);
787    INIT_LIST_HEAD(&timer->active_list_head);
788    INIT_LIST_HEAD(&timer->ack_list_head);
789    INIT_LIST_HEAD(&timer->sack_list_head);
790    spin_lock_init(&timer->lock);
791    tasklet_init(&timer->task_queue, snd_timer_tasklet,
792             (unsigned long)timer);
793    if (card != NULL) {
794        timer->module = card->module;
795        err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
796        if (err < 0) {
797            snd_timer_free(timer);
798            return err;
799        }
800    }
801    if (rtimer)
802        *rtimer = timer;
803    return 0;
804}
805
806static int snd_timer_free(struct snd_timer *timer)
807{
808    if (!timer)
809        return 0;
810
811    mutex_lock(&register_mutex);
812    if (! list_empty(&timer->open_list_head)) {
813        struct list_head *p, *n;
814        struct snd_timer_instance *ti;
815        snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
816        list_for_each_safe(p, n, &timer->open_list_head) {
817            list_del_init(p);
818            ti = list_entry(p, struct snd_timer_instance, open_list);
819            ti->timer = NULL;
820        }
821    }
822    list_del(&timer->device_list);
823    mutex_unlock(&register_mutex);
824
825    if (timer->private_free)
826        timer->private_free(timer);
827    kfree(timer);
828    return 0;
829}
830
831static int snd_timer_dev_free(struct snd_device *device)
832{
833    struct snd_timer *timer = device->device_data;
834    return snd_timer_free(timer);
835}
836
837static int snd_timer_dev_register(struct snd_device *dev)
838{
839    struct snd_timer *timer = dev->device_data;
840    struct snd_timer *timer1;
841
842    if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
843        return -ENXIO;
844    if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
845        !timer->hw.resolution && timer->hw.c_resolution == NULL)
846            return -EINVAL;
847
848    mutex_lock(&register_mutex);
849    list_for_each_entry(timer1, &snd_timer_list, device_list) {
850        if (timer1->tmr_class > timer->tmr_class)
851            break;
852        if (timer1->tmr_class < timer->tmr_class)
853            continue;
854        if (timer1->card && timer->card) {
855            if (timer1->card->number > timer->card->number)
856                break;
857            if (timer1->card->number < timer->card->number)
858                continue;
859        }
860        if (timer1->tmr_device > timer->tmr_device)
861            break;
862        if (timer1->tmr_device < timer->tmr_device)
863            continue;
864        if (timer1->tmr_subdevice > timer->tmr_subdevice)
865            break;
866        if (timer1->tmr_subdevice < timer->tmr_subdevice)
867            continue;
868        /* conflicts.. */
869        mutex_unlock(&register_mutex);
870        return -EBUSY;
871    }
872    list_add_tail(&timer->device_list, &timer1->device_list);
873    mutex_unlock(&register_mutex);
874    return 0;
875}
876
877static int snd_timer_dev_disconnect(struct snd_device *device)
878{
879    struct snd_timer *timer = device->device_data;
880    mutex_lock(&register_mutex);
881    list_del_init(&timer->device_list);
882    mutex_unlock(&register_mutex);
883    return 0;
884}
885
886void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
887{
888    unsigned long flags;
889    unsigned long resolution = 0;
890    struct snd_timer_instance *ti, *ts;
891
892    if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
893        return;
894    if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
895               event > SNDRV_TIMER_EVENT_MRESUME))
896        return;
897    spin_lock_irqsave(&timer->lock, flags);
898    if (event == SNDRV_TIMER_EVENT_MSTART ||
899        event == SNDRV_TIMER_EVENT_MCONTINUE ||
900        event == SNDRV_TIMER_EVENT_MRESUME) {
901        if (timer->hw.c_resolution)
902            resolution = timer->hw.c_resolution(timer);
903        else
904            resolution = timer->hw.resolution;
905    }
906    list_for_each_entry(ti, &timer->active_list_head, active_list) {
907        if (ti->ccallback)
908            ti->ccallback(ti, event, tstamp, resolution);
909        list_for_each_entry(ts, &ti->slave_active_head, active_list)
910            if (ts->ccallback)
911                ts->ccallback(ts, event, tstamp, resolution);
912    }
913    spin_unlock_irqrestore(&timer->lock, flags);
914}
915
916/*
917 * exported functions for global timers
918 */
919int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
920{
921    struct snd_timer_id tid;
922
923    tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
924    tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
925    tid.card = -1;
926    tid.device = device;
927    tid.subdevice = 0;
928    return snd_timer_new(NULL, id, &tid, rtimer);
929}
930
931int snd_timer_global_free(struct snd_timer *timer)
932{
933    return snd_timer_free(timer);
934}
935
936int snd_timer_global_register(struct snd_timer *timer)
937{
938    struct snd_device dev;
939
940    memset(&dev, 0, sizeof(dev));
941    dev.device_data = timer;
942    return snd_timer_dev_register(&dev);
943}
944
945/*
946 * System timer
947 */
948
949struct snd_timer_system_private {
950    struct timer_list tlist;
951    unsigned long last_expires;
952    unsigned long last_jiffies;
953    unsigned long correction;
954};
955
956static void snd_timer_s_function(unsigned long data)
957{
958    struct snd_timer *timer = (struct snd_timer *)data;
959    struct snd_timer_system_private *priv = timer->private_data;
960    unsigned long jiff = jiffies;
961    if (time_after(jiff, priv->last_expires))
962        priv->correction += (long)jiff - (long)priv->last_expires;
963    snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
964}
965
966static int snd_timer_s_start(struct snd_timer * timer)
967{
968    struct snd_timer_system_private *priv;
969    unsigned long njiff;
970
971    priv = (struct snd_timer_system_private *) timer->private_data;
972    njiff = (priv->last_jiffies = jiffies);
973    if (priv->correction > timer->sticks - 1) {
974        priv->correction -= timer->sticks - 1;
975        njiff++;
976    } else {
977        njiff += timer->sticks - priv->correction;
978        priv->correction = 0;
979    }
980    priv->last_expires = priv->tlist.expires = njiff;
981    add_timer(&priv->tlist);
982    return 0;
983}
984
985static int snd_timer_s_stop(struct snd_timer * timer)
986{
987    struct snd_timer_system_private *priv;
988    unsigned long jiff;
989
990    priv = (struct snd_timer_system_private *) timer->private_data;
991    del_timer(&priv->tlist);
992    jiff = jiffies;
993    if (time_before(jiff, priv->last_expires))
994        timer->sticks = priv->last_expires - jiff;
995    else
996        timer->sticks = 1;
997    priv->correction = 0;
998    return 0;
999}
1000
1001static struct snd_timer_hardware snd_timer_system =
1002{
1003    .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1004    .resolution = 1000000000L / HZ,
1005    .ticks = 10000000L,
1006    .start = snd_timer_s_start,
1007    .stop = snd_timer_s_stop
1008};
1009
1010static void snd_timer_free_system(struct snd_timer *timer)
1011{
1012    kfree(timer->private_data);
1013}
1014
1015static int snd_timer_register_system(void)
1016{
1017    struct snd_timer *timer;
1018    struct snd_timer_system_private *priv;
1019    int err;
1020
1021    err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1022    if (err < 0)
1023        return err;
1024    strcpy(timer->name, "system timer");
1025    timer->hw = snd_timer_system;
1026    priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1027    if (priv == NULL) {
1028        snd_timer_free(timer);
1029        return -ENOMEM;
1030    }
1031    init_timer(&priv->tlist);
1032    priv->tlist.function = snd_timer_s_function;
1033    priv->tlist.data = (unsigned long) timer;
1034    timer->private_data = priv;
1035    timer->private_free = snd_timer_free_system;
1036    return snd_timer_global_register(timer);
1037}
1038
1039#ifdef CONFIG_PROC_FS
1040/*
1041 * Info interface
1042 */
1043
1044static void snd_timer_proc_read(struct snd_info_entry *entry,
1045                struct snd_info_buffer *buffer)
1046{
1047    struct snd_timer *timer;
1048    struct snd_timer_instance *ti;
1049
1050    mutex_lock(&register_mutex);
1051    list_for_each_entry(timer, &snd_timer_list, device_list) {
1052        switch (timer->tmr_class) {
1053        case SNDRV_TIMER_CLASS_GLOBAL:
1054            snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1055            break;
1056        case SNDRV_TIMER_CLASS_CARD:
1057            snd_iprintf(buffer, "C%i-%i: ",
1058                    timer->card->number, timer->tmr_device);
1059            break;
1060        case SNDRV_TIMER_CLASS_PCM:
1061            snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1062                    timer->tmr_device, timer->tmr_subdevice);
1063            break;
1064        default:
1065            snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1066                    timer->card ? timer->card->number : -1,
1067                    timer->tmr_device, timer->tmr_subdevice);
1068        }
1069        snd_iprintf(buffer, "%s :", timer->name);
1070        if (timer->hw.resolution)
1071            snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1072                    timer->hw.resolution / 1000,
1073                    timer->hw.resolution % 1000,
1074                    timer->hw.ticks);
1075        if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1076            snd_iprintf(buffer, " SLAVE");
1077        snd_iprintf(buffer, "\n");
1078        list_for_each_entry(ti, &timer->open_list_head, open_list)
1079            snd_iprintf(buffer, " Client %s : %s\n",
1080                    ti->owner ? ti->owner : "unknown",
1081                    ti->flags & (SNDRV_TIMER_IFLG_START |
1082                         SNDRV_TIMER_IFLG_RUNNING)
1083                    ? "running" : "stopped");
1084    }
1085    mutex_unlock(&register_mutex);
1086}
1087
1088static struct snd_info_entry *snd_timer_proc_entry;
1089
1090static void __init snd_timer_proc_init(void)
1091{
1092    struct snd_info_entry *entry;
1093
1094    entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1095    if (entry != NULL) {
1096        entry->c.text.read = snd_timer_proc_read;
1097        if (snd_info_register(entry) < 0) {
1098            snd_info_free_entry(entry);
1099            entry = NULL;
1100        }
1101    }
1102    snd_timer_proc_entry = entry;
1103}
1104
1105static void __exit snd_timer_proc_done(void)
1106{
1107    snd_info_free_entry(snd_timer_proc_entry);
1108}
1109#else /* !CONFIG_PROC_FS */
1110#define snd_timer_proc_init()
1111#define snd_timer_proc_done()
1112#endif
1113
1114/*
1115 * USER SPACE interface
1116 */
1117
1118static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1119                     unsigned long resolution,
1120                     unsigned long ticks)
1121{
1122    struct snd_timer_user *tu = timeri->callback_data;
1123    struct snd_timer_read *r;
1124    int prev;
1125
1126    spin_lock(&tu->qlock);
1127    if (tu->qused > 0) {
1128        prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1129        r = &tu->queue[prev];
1130        if (r->resolution == resolution) {
1131            r->ticks += ticks;
1132            goto __wake;
1133        }
1134    }
1135    if (tu->qused >= tu->queue_size) {
1136        tu->overrun++;
1137    } else {
1138        r = &tu->queue[tu->qtail++];
1139        tu->qtail %= tu->queue_size;
1140        r->resolution = resolution;
1141        r->ticks = ticks;
1142        tu->qused++;
1143    }
1144      __wake:
1145    spin_unlock(&tu->qlock);
1146    kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1147    wake_up(&tu->qchange_sleep);
1148}
1149
1150static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1151                        struct snd_timer_tread *tread)
1152{
1153    if (tu->qused >= tu->queue_size) {
1154        tu->overrun++;
1155    } else {
1156        memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1157        tu->qtail %= tu->queue_size;
1158        tu->qused++;
1159    }
1160}
1161
1162static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1163                     int event,
1164                     struct timespec *tstamp,
1165                     unsigned long resolution)
1166{
1167    struct snd_timer_user *tu = timeri->callback_data;
1168    struct snd_timer_tread r1;
1169    unsigned long flags;
1170
1171    if (event >= SNDRV_TIMER_EVENT_START &&
1172        event <= SNDRV_TIMER_EVENT_PAUSE)
1173        tu->tstamp = *tstamp;
1174    if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1175        return;
1176    r1.event = event;
1177    r1.tstamp = *tstamp;
1178    r1.val = resolution;
1179    spin_lock_irqsave(&tu->qlock, flags);
1180    snd_timer_user_append_to_tqueue(tu, &r1);
1181    spin_unlock_irqrestore(&tu->qlock, flags);
1182    kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1183    wake_up(&tu->qchange_sleep);
1184}
1185
1186static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1187                      unsigned long resolution,
1188                      unsigned long ticks)
1189{
1190    struct snd_timer_user *tu = timeri->callback_data;
1191    struct snd_timer_tread *r, r1;
1192    struct timespec tstamp;
1193    int prev, append = 0;
1194
1195    memset(&tstamp, 0, sizeof(tstamp));
1196    spin_lock(&tu->qlock);
1197    if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1198               (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1199        spin_unlock(&tu->qlock);
1200        return;
1201    }
1202    if (tu->last_resolution != resolution || ticks > 0) {
1203        if (timer_tstamp_monotonic)
1204            do_posix_clock_monotonic_gettime(&tstamp);
1205        else
1206            getnstimeofday(&tstamp);
1207    }
1208    if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1209        tu->last_resolution != resolution) {
1210        r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1211        r1.tstamp = tstamp;
1212        r1.val = resolution;
1213        snd_timer_user_append_to_tqueue(tu, &r1);
1214        tu->last_resolution = resolution;
1215        append++;
1216    }
1217    if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1218        goto __wake;
1219    if (ticks == 0)
1220        goto __wake;
1221    if (tu->qused > 0) {
1222        prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1223        r = &tu->tqueue[prev];
1224        if (r->event == SNDRV_TIMER_EVENT_TICK) {
1225            r->tstamp = tstamp;
1226            r->val += ticks;
1227            append++;
1228            goto __wake;
1229        }
1230    }
1231    r1.event = SNDRV_TIMER_EVENT_TICK;
1232    r1.tstamp = tstamp;
1233    r1.val = ticks;
1234    snd_timer_user_append_to_tqueue(tu, &r1);
1235    append++;
1236      __wake:
1237    spin_unlock(&tu->qlock);
1238    if (append == 0)
1239        return;
1240    kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1241    wake_up(&tu->qchange_sleep);
1242}
1243
1244static int snd_timer_user_open(struct inode *inode, struct file *file)
1245{
1246    struct snd_timer_user *tu;
1247    int err;
1248
1249    err = nonseekable_open(inode, file);
1250    if (err < 0)
1251        return err;
1252
1253    tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1254    if (tu == NULL)
1255        return -ENOMEM;
1256    spin_lock_init(&tu->qlock);
1257    init_waitqueue_head(&tu->qchange_sleep);
1258    mutex_init(&tu->tread_sem);
1259    tu->ticks = 1;
1260    tu->queue_size = 128;
1261    tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1262                GFP_KERNEL);
1263    if (tu->queue == NULL) {
1264        kfree(tu);
1265        return -ENOMEM;
1266    }
1267    file->private_data = tu;
1268    return 0;
1269}
1270
1271static int snd_timer_user_release(struct inode *inode, struct file *file)
1272{
1273    struct snd_timer_user *tu;
1274
1275    if (file->private_data) {
1276        tu = file->private_data;
1277        file->private_data = NULL;
1278        if (tu->timeri)
1279            snd_timer_close(tu->timeri);
1280        kfree(tu->queue);
1281        kfree(tu->tqueue);
1282        kfree(tu);
1283    }
1284    return 0;
1285}
1286
1287static void snd_timer_user_zero_id(struct snd_timer_id *id)
1288{
1289    id->dev_class = SNDRV_TIMER_CLASS_NONE;
1290    id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1291    id->card = -1;
1292    id->device = -1;
1293    id->subdevice = -1;
1294}
1295
1296static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1297{
1298    id->dev_class = timer->tmr_class;
1299    id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1300    id->card = timer->card ? timer->card->number : -1;
1301    id->device = timer->tmr_device;
1302    id->subdevice = timer->tmr_subdevice;
1303}
1304
1305static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1306{
1307    struct snd_timer_id id;
1308    struct snd_timer *timer;
1309    struct list_head *p;
1310
1311    if (copy_from_user(&id, _tid, sizeof(id)))
1312        return -EFAULT;
1313    mutex_lock(&register_mutex);
1314    if (id.dev_class < 0) { /* first item */
1315        if (list_empty(&snd_timer_list))
1316            snd_timer_user_zero_id(&id);
1317        else {
1318            timer = list_entry(snd_timer_list.next,
1319                       struct snd_timer, device_list);
1320            snd_timer_user_copy_id(&id, timer);
1321        }
1322    } else {
1323        switch (id.dev_class) {
1324        case SNDRV_TIMER_CLASS_GLOBAL:
1325            id.device = id.device < 0 ? 0 : id.device + 1;
1326            list_for_each(p, &snd_timer_list) {
1327                timer = list_entry(p, struct snd_timer, device_list);
1328                if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1329                    snd_timer_user_copy_id(&id, timer);
1330                    break;
1331                }
1332                if (timer->tmr_device >= id.device) {
1333                    snd_timer_user_copy_id(&id, timer);
1334                    break;
1335                }
1336            }
1337            if (p == &snd_timer_list)
1338                snd_timer_user_zero_id(&id);
1339            break;
1340        case SNDRV_TIMER_CLASS_CARD:
1341        case SNDRV_TIMER_CLASS_PCM:
1342            if (id.card < 0) {
1343                id.card = 0;
1344            } else {
1345                if (id.card < 0) {
1346                    id.card = 0;
1347                } else {
1348                    if (id.device < 0) {
1349                        id.device = 0;
1350                    } else {
1351                        if (id.subdevice < 0) {
1352                            id.subdevice = 0;
1353                        } else {
1354                            id.subdevice++;
1355                        }
1356                    }
1357                }
1358            }
1359            list_for_each(p, &snd_timer_list) {
1360                timer = list_entry(p, struct snd_timer, device_list);
1361                if (timer->tmr_class > id.dev_class) {
1362                    snd_timer_user_copy_id(&id, timer);
1363                    break;
1364                }
1365                if (timer->tmr_class < id.dev_class)
1366                    continue;
1367                if (timer->card->number > id.card) {
1368                    snd_timer_user_copy_id(&id, timer);
1369                    break;
1370                }
1371                if (timer->card->number < id.card)
1372                    continue;
1373                if (timer->tmr_device > id.device) {
1374                    snd_timer_user_copy_id(&id, timer);
1375                    break;
1376                }
1377                if (timer->tmr_device < id.device)
1378                    continue;
1379                if (timer->tmr_subdevice > id.subdevice) {
1380                    snd_timer_user_copy_id(&id, timer);
1381                    break;
1382                }
1383                if (timer->tmr_subdevice < id.subdevice)
1384                    continue;
1385                snd_timer_user_copy_id(&id, timer);
1386                break;
1387            }
1388            if (p == &snd_timer_list)
1389                snd_timer_user_zero_id(&id);
1390            break;
1391        default:
1392            snd_timer_user_zero_id(&id);
1393        }
1394    }
1395    mutex_unlock(&register_mutex);
1396    if (copy_to_user(_tid, &id, sizeof(*_tid)))
1397        return -EFAULT;
1398    return 0;
1399}
1400
1401static int snd_timer_user_ginfo(struct file *file,
1402                struct snd_timer_ginfo __user *_ginfo)
1403{
1404    struct snd_timer_ginfo *ginfo;
1405    struct snd_timer_id tid;
1406    struct snd_timer *t;
1407    struct list_head *p;
1408    int err = 0;
1409
1410    ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1411    if (IS_ERR(ginfo))
1412        return PTR_ERR(ginfo);
1413
1414    tid = ginfo->tid;
1415    memset(ginfo, 0, sizeof(*ginfo));
1416    ginfo->tid = tid;
1417    mutex_lock(&register_mutex);
1418    t = snd_timer_find(&tid);
1419    if (t != NULL) {
1420        ginfo->card = t->card ? t->card->number : -1;
1421        if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1422            ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1423        strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1424        strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1425        ginfo->resolution = t->hw.resolution;
1426        if (t->hw.resolution_min > 0) {
1427            ginfo->resolution_min = t->hw.resolution_min;
1428            ginfo->resolution_max = t->hw.resolution_max;
1429        }
1430        list_for_each(p, &t->open_list_head) {
1431            ginfo->clients++;
1432        }
1433    } else {
1434        err = -ENODEV;
1435    }
1436    mutex_unlock(&register_mutex);
1437    if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1438        err = -EFAULT;
1439    kfree(ginfo);
1440    return err;
1441}
1442
1443static int snd_timer_user_gparams(struct file *file,
1444                  struct snd_timer_gparams __user *_gparams)
1445{
1446    struct snd_timer_gparams gparams;
1447    struct snd_timer *t;
1448    int err;
1449
1450    if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1451        return -EFAULT;
1452    mutex_lock(&register_mutex);
1453    t = snd_timer_find(&gparams.tid);
1454    if (!t) {
1455        err = -ENODEV;
1456        goto _error;
1457    }
1458    if (!list_empty(&t->open_list_head)) {
1459        err = -EBUSY;
1460        goto _error;
1461    }
1462    if (!t->hw.set_period) {
1463        err = -ENOSYS;
1464        goto _error;
1465    }
1466    err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1467_error:
1468    mutex_unlock(&register_mutex);
1469    return err;
1470}
1471
1472static int snd_timer_user_gstatus(struct file *file,
1473                  struct snd_timer_gstatus __user *_gstatus)
1474{
1475    struct snd_timer_gstatus gstatus;
1476    struct snd_timer_id tid;
1477    struct snd_timer *t;
1478    int err = 0;
1479
1480    if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1481        return -EFAULT;
1482    tid = gstatus.tid;
1483    memset(&gstatus, 0, sizeof(gstatus));
1484    gstatus.tid = tid;
1485    mutex_lock(&register_mutex);
1486    t = snd_timer_find(&tid);
1487    if (t != NULL) {
1488        if (t->hw.c_resolution)
1489            gstatus.resolution = t->hw.c_resolution(t);
1490        else
1491            gstatus.resolution = t->hw.resolution;
1492        if (t->hw.precise_resolution) {
1493            t->hw.precise_resolution(t, &gstatus.resolution_num,
1494                         &gstatus.resolution_den);
1495        } else {
1496            gstatus.resolution_num = gstatus.resolution;
1497            gstatus.resolution_den = 1000000000uL;
1498        }
1499    } else {
1500        err = -ENODEV;
1501    }
1502    mutex_unlock(&register_mutex);
1503    if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1504        err = -EFAULT;
1505    return err;
1506}
1507
1508static int snd_timer_user_tselect(struct file *file,
1509                  struct snd_timer_select __user *_tselect)
1510{
1511    struct snd_timer_user *tu;
1512    struct snd_timer_select tselect;
1513    char str[32];
1514    int err = 0;
1515
1516    tu = file->private_data;
1517    mutex_lock(&tu->tread_sem);
1518    if (tu->timeri) {
1519        snd_timer_close(tu->timeri);
1520        tu->timeri = NULL;
1521    }
1522    if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1523        err = -EFAULT;
1524        goto __err;
1525    }
1526    sprintf(str, "application %i", current->pid);
1527    if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1528        tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1529    err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1530    if (err < 0)
1531        goto __err;
1532
1533    kfree(tu->queue);
1534    tu->queue = NULL;
1535    kfree(tu->tqueue);
1536    tu->tqueue = NULL;
1537    if (tu->tread) {
1538        tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1539                     GFP_KERNEL);
1540        if (tu->tqueue == NULL)
1541            err = -ENOMEM;
1542    } else {
1543        tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1544                    GFP_KERNEL);
1545        if (tu->queue == NULL)
1546            err = -ENOMEM;
1547    }
1548
1549          if (err < 0) {
1550        snd_timer_close(tu->timeri);
1551              tu->timeri = NULL;
1552          } else {
1553        tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1554        tu->timeri->callback = tu->tread
1555            ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1556        tu->timeri->ccallback = snd_timer_user_ccallback;
1557        tu->timeri->callback_data = (void *)tu;
1558    }
1559
1560      __err:
1561          mutex_unlock(&tu->tread_sem);
1562    return err;
1563}
1564
1565static int snd_timer_user_info(struct file *file,
1566                   struct snd_timer_info __user *_info)
1567{
1568    struct snd_timer_user *tu;
1569    struct snd_timer_info *info;
1570    struct snd_timer *t;
1571    int err = 0;
1572
1573    tu = file->private_data;
1574    if (!tu->timeri)
1575        return -EBADFD;
1576    t = tu->timeri->timer;
1577    if (!t)
1578        return -EBADFD;
1579
1580    info = kzalloc(sizeof(*info), GFP_KERNEL);
1581    if (! info)
1582        return -ENOMEM;
1583    info->card = t->card ? t->card->number : -1;
1584    if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1585        info->flags |= SNDRV_TIMER_FLG_SLAVE;
1586    strlcpy(info->id, t->id, sizeof(info->id));
1587    strlcpy(info->name, t->name, sizeof(info->name));
1588    info->resolution = t->hw.resolution;
1589    if (copy_to_user(_info, info, sizeof(*_info)))
1590        err = -EFAULT;
1591    kfree(info);
1592    return err;
1593}
1594
1595static int snd_timer_user_params(struct file *file,
1596                 struct snd_timer_params __user *_params)
1597{
1598    struct snd_timer_user *tu;
1599    struct snd_timer_params params;
1600    struct snd_timer *t;
1601    struct snd_timer_read *tr;
1602    struct snd_timer_tread *ttr;
1603    int err;
1604
1605    tu = file->private_data;
1606    if (!tu->timeri)
1607        return -EBADFD;
1608    t = tu->timeri->timer;
1609    if (!t)
1610        return -EBADFD;
1611    if (copy_from_user(&params, _params, sizeof(params)))
1612        return -EFAULT;
1613    if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1614        err = -EINVAL;
1615        goto _end;
1616    }
1617    if (params.queue_size > 0 &&
1618        (params.queue_size < 32 || params.queue_size > 1024)) {
1619        err = -EINVAL;
1620        goto _end;
1621    }
1622    if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1623                  (1<<SNDRV_TIMER_EVENT_TICK)|
1624                  (1<<SNDRV_TIMER_EVENT_START)|
1625                  (1<<SNDRV_TIMER_EVENT_STOP)|
1626                  (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1627                  (1<<SNDRV_TIMER_EVENT_PAUSE)|
1628                  (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1629                  (1<<SNDRV_TIMER_EVENT_RESUME)|
1630                  (1<<SNDRV_TIMER_EVENT_MSTART)|
1631                  (1<<SNDRV_TIMER_EVENT_MSTOP)|
1632                  (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1633                  (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1634                  (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1635                  (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1636        err = -EINVAL;
1637        goto _end;
1638    }
1639    snd_timer_stop(tu->timeri);
1640    spin_lock_irq(&t->lock);
1641    tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1642                   SNDRV_TIMER_IFLG_EXCLUSIVE|
1643                   SNDRV_TIMER_IFLG_EARLY_EVENT);
1644    if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1645        tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1646    if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1647        tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1648    if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1649        tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1650    spin_unlock_irq(&t->lock);
1651    if (params.queue_size > 0 &&
1652        (unsigned int)tu->queue_size != params.queue_size) {
1653        if (tu->tread) {
1654            ttr = kmalloc(params.queue_size * sizeof(*ttr),
1655                      GFP_KERNEL);
1656            if (ttr) {
1657                kfree(tu->tqueue);
1658                tu->queue_size = params.queue_size;
1659                tu->tqueue = ttr;
1660            }
1661        } else {
1662            tr = kmalloc(params.queue_size * sizeof(*tr),
1663                     GFP_KERNEL);
1664            if (tr) {
1665                kfree(tu->queue);
1666                tu->queue_size = params.queue_size;
1667                tu->queue = tr;
1668            }
1669        }
1670    }
1671    tu->qhead = tu->qtail = tu->qused = 0;
1672    if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1673        if (tu->tread) {
1674            struct snd_timer_tread tread;
1675            tread.event = SNDRV_TIMER_EVENT_EARLY;
1676            tread.tstamp.tv_sec = 0;
1677            tread.tstamp.tv_nsec = 0;
1678            tread.val = 0;
1679            snd_timer_user_append_to_tqueue(tu, &tread);
1680        } else {
1681            struct snd_timer_read *r = &tu->queue[0];
1682            r->resolution = 0;
1683            r->ticks = 0;
1684            tu->qused++;
1685            tu->qtail++;
1686        }
1687    }
1688    tu->filter = params.filter;
1689    tu->ticks = params.ticks;
1690    err = 0;
1691 _end:
1692    if (copy_to_user(_params, &params, sizeof(params)))
1693        return -EFAULT;
1694    return err;
1695}
1696
1697static int snd_timer_user_status(struct file *file,
1698                 struct snd_timer_status __user *_status)
1699{
1700    struct snd_timer_user *tu;
1701    struct snd_timer_status status;
1702
1703    tu = file->private_data;
1704    if (!tu->timeri)
1705        return -EBADFD;
1706    memset(&status, 0, sizeof(status));
1707    status.tstamp = tu->tstamp;
1708    status.resolution = snd_timer_resolution(tu->timeri);
1709    status.lost = tu->timeri->lost;
1710    status.overrun = tu->overrun;
1711    spin_lock_irq(&tu->qlock);
1712    status.queue = tu->qused;
1713    spin_unlock_irq(&tu->qlock);
1714    if (copy_to_user(_status, &status, sizeof(status)))
1715        return -EFAULT;
1716    return 0;
1717}
1718
1719static int snd_timer_user_start(struct file *file)
1720{
1721    int err;
1722    struct snd_timer_user *tu;
1723
1724    tu = file->private_data;
1725    if (!tu->timeri)
1726        return -EBADFD;
1727    snd_timer_stop(tu->timeri);
1728    tu->timeri->lost = 0;
1729    tu->last_resolution = 0;
1730    return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1731}
1732
1733static int snd_timer_user_stop(struct file *file)
1734{
1735    int err;
1736    struct snd_timer_user *tu;
1737
1738    tu = file->private_data;
1739    if (!tu->timeri)
1740        return -EBADFD;
1741    return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1742}
1743
1744static int snd_timer_user_continue(struct file *file)
1745{
1746    int err;
1747    struct snd_timer_user *tu;
1748
1749    tu = file->private_data;
1750    if (!tu->timeri)
1751        return -EBADFD;
1752    tu->timeri->lost = 0;
1753    return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1754}
1755
1756static int snd_timer_user_pause(struct file *file)
1757{
1758    int err;
1759    struct snd_timer_user *tu;
1760
1761    tu = file->private_data;
1762    if (!tu->timeri)
1763        return -EBADFD;
1764    return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1765}
1766
1767enum {
1768    SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1769    SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1770    SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1771    SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1772};
1773
1774static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1775                 unsigned long arg)
1776{
1777    struct snd_timer_user *tu;
1778    void __user *argp = (void __user *)arg;
1779    int __user *p = argp;
1780
1781    tu = file->private_data;
1782    switch (cmd) {
1783    case SNDRV_TIMER_IOCTL_PVERSION:
1784        return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1785    case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1786        return snd_timer_user_next_device(argp);
1787    case SNDRV_TIMER_IOCTL_TREAD:
1788    {
1789        int xarg;
1790
1791        mutex_lock(&tu->tread_sem);
1792        if (tu->timeri) { /* too late */
1793            mutex_unlock(&tu->tread_sem);
1794            return -EBUSY;
1795        }
1796        if (get_user(xarg, p)) {
1797            mutex_unlock(&tu->tread_sem);
1798            return -EFAULT;
1799        }
1800        tu->tread = xarg ? 1 : 0;
1801        mutex_unlock(&tu->tread_sem);
1802        return 0;
1803    }
1804    case SNDRV_TIMER_IOCTL_GINFO:
1805        return snd_timer_user_ginfo(file, argp);
1806    case SNDRV_TIMER_IOCTL_GPARAMS:
1807        return snd_timer_user_gparams(file, argp);
1808    case SNDRV_TIMER_IOCTL_GSTATUS:
1809        return snd_timer_user_gstatus(file, argp);
1810    case SNDRV_TIMER_IOCTL_SELECT:
1811        return snd_timer_user_tselect(file, argp);
1812    case SNDRV_TIMER_IOCTL_INFO:
1813        return snd_timer_user_info(file, argp);
1814    case SNDRV_TIMER_IOCTL_PARAMS:
1815        return snd_timer_user_params(file, argp);
1816    case SNDRV_TIMER_IOCTL_STATUS:
1817        return snd_timer_user_status(file, argp);
1818    case SNDRV_TIMER_IOCTL_START:
1819    case SNDRV_TIMER_IOCTL_START_OLD:
1820        return snd_timer_user_start(file);
1821    case SNDRV_TIMER_IOCTL_STOP:
1822    case SNDRV_TIMER_IOCTL_STOP_OLD:
1823        return snd_timer_user_stop(file);
1824    case SNDRV_TIMER_IOCTL_CONTINUE:
1825    case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1826        return snd_timer_user_continue(file);
1827    case SNDRV_TIMER_IOCTL_PAUSE:
1828    case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1829        return snd_timer_user_pause(file);
1830    }
1831    return -ENOTTY;
1832}
1833
1834static int snd_timer_user_fasync(int fd, struct file * file, int on)
1835{
1836    struct snd_timer_user *tu;
1837
1838    tu = file->private_data;
1839    return fasync_helper(fd, file, on, &tu->fasync);
1840}
1841
1842static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1843                   size_t count, loff_t *offset)
1844{
1845    struct snd_timer_user *tu;
1846    long result = 0, unit;
1847    int err = 0;
1848
1849    tu = file->private_data;
1850    unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1851    spin_lock_irq(&tu->qlock);
1852    while ((long)count - result >= unit) {
1853        while (!tu->qused) {
1854            wait_queue_t wait;
1855
1856            if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1857                err = -EAGAIN;
1858                break;
1859            }
1860
1861            set_current_state(TASK_INTERRUPTIBLE);
1862            init_waitqueue_entry(&wait, current);
1863            add_wait_queue(&tu->qchange_sleep, &wait);
1864
1865            spin_unlock_irq(&tu->qlock);
1866            schedule();
1867            spin_lock_irq(&tu->qlock);
1868
1869            remove_wait_queue(&tu->qchange_sleep, &wait);
1870
1871            if (signal_pending(current)) {
1872                err = -ERESTARTSYS;
1873                break;
1874            }
1875        }
1876
1877        spin_unlock_irq(&tu->qlock);
1878        if (err < 0)
1879            goto _error;
1880
1881        if (tu->tread) {
1882            if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
1883                     sizeof(struct snd_timer_tread))) {
1884                err = -EFAULT;
1885                goto _error;
1886            }
1887        } else {
1888            if (copy_to_user(buffer, &tu->queue[tu->qhead++],
1889                     sizeof(struct snd_timer_read))) {
1890                err = -EFAULT;
1891                goto _error;
1892            }
1893        }
1894
1895        tu->qhead %= tu->queue_size;
1896
1897        result += unit;
1898        buffer += unit;
1899
1900        spin_lock_irq(&tu->qlock);
1901        tu->qused--;
1902    }
1903    spin_unlock_irq(&tu->qlock);
1904 _error:
1905    return result > 0 ? result : err;
1906}
1907
1908static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1909{
1910        unsigned int mask;
1911        struct snd_timer_user *tu;
1912
1913        tu = file->private_data;
1914
1915        poll_wait(file, &tu->qchange_sleep, wait);
1916
1917    mask = 0;
1918    if (tu->qused)
1919        mask |= POLLIN | POLLRDNORM;
1920
1921    return mask;
1922}
1923
1924#ifdef CONFIG_COMPAT
1925#include "timer_compat.c"
1926#else
1927#define snd_timer_user_ioctl_compat NULL
1928#endif
1929
1930static const struct file_operations snd_timer_f_ops =
1931{
1932    .owner = THIS_MODULE,
1933    .read = snd_timer_user_read,
1934    .open = snd_timer_user_open,
1935    .release = snd_timer_user_release,
1936    .llseek = no_llseek,
1937    .poll = snd_timer_user_poll,
1938    .unlocked_ioctl = snd_timer_user_ioctl,
1939    .compat_ioctl = snd_timer_user_ioctl_compat,
1940    .fasync = snd_timer_user_fasync,
1941};
1942
1943/*
1944 * ENTRY functions
1945 */
1946
1947static int __init alsa_timer_init(void)
1948{
1949    int err;
1950
1951#ifdef SNDRV_OSS_INFO_DEV_TIMERS
1952    snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1953                  "system timer");
1954#endif
1955
1956    if ((err = snd_timer_register_system()) < 0)
1957        snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1958               err);
1959    if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1960                       &snd_timer_f_ops, NULL, "timer")) < 0)
1961        snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1962               err);
1963    snd_timer_proc_init();
1964    return 0;
1965}
1966
1967static void __exit alsa_timer_exit(void)
1968{
1969    struct list_head *p, *n;
1970
1971    snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1972    /* unregister the system timer */
1973    list_for_each_safe(p, n, &snd_timer_list) {
1974        struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
1975        snd_timer_free(timer);
1976    }
1977    snd_timer_proc_done();
1978#ifdef SNDRV_OSS_INFO_DEV_TIMERS
1979    snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1980#endif
1981}
1982
1983module_init(alsa_timer_init)
1984module_exit(alsa_timer_exit)
1985
1986EXPORT_SYMBOL(snd_timer_open);
1987EXPORT_SYMBOL(snd_timer_close);
1988EXPORT_SYMBOL(snd_timer_resolution);
1989EXPORT_SYMBOL(snd_timer_start);
1990EXPORT_SYMBOL(snd_timer_stop);
1991EXPORT_SYMBOL(snd_timer_continue);
1992EXPORT_SYMBOL(snd_timer_pause);
1993EXPORT_SYMBOL(snd_timer_new);
1994EXPORT_SYMBOL(snd_timer_notify);
1995EXPORT_SYMBOL(snd_timer_global_new);
1996EXPORT_SYMBOL(snd_timer_global_free);
1997EXPORT_SYMBOL(snd_timer_global_register);
1998EXPORT_SYMBOL(snd_timer_interrupt);
1999

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