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TOMOYO Linux Cross Reference
Linux/sound/core/timer.c

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  1 /*
  2  *  Timers abstract layer
  3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  4  *
  5  *
  6  *   This program is free software; you can redistribute it and/or modify
  7  *   it under the terms of the GNU General Public License as published by
  8  *   the Free Software Foundation; either version 2 of the License, or
  9  *   (at your option) any later version.
 10  *
 11  *   This program is distributed in the hope that it will be useful,
 12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  *   GNU General Public License for more details.
 15  *
 16  *   You should have received a copy of the GNU General Public License
 17  *   along with this program; if not, write to the Free Software
 18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 19  *
 20  */
 21 
 22 #include <linux/delay.h>
 23 #include <linux/init.h>
 24 #include <linux/slab.h>
 25 #include <linux/time.h>
 26 #include <linux/mutex.h>
 27 #include <linux/device.h>
 28 #include <linux/module.h>
 29 #include <linux/string.h>
 30 #include <sound/core.h>
 31 #include <sound/timer.h>
 32 #include <sound/control.h>
 33 #include <sound/info.h>
 34 #include <sound/minors.h>
 35 #include <sound/initval.h>
 36 #include <linux/kmod.h>
 37 
 38 #if IS_ENABLED(CONFIG_SND_HRTIMER)
 39 #define DEFAULT_TIMER_LIMIT 4
 40 #elif IS_ENABLED(CONFIG_SND_RTCTIMER)
 41 #define DEFAULT_TIMER_LIMIT 2
 42 #else
 43 #define DEFAULT_TIMER_LIMIT 1
 44 #endif
 45 
 46 static int timer_limit = DEFAULT_TIMER_LIMIT;
 47 static int timer_tstamp_monotonic = 1;
 48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
 49 MODULE_DESCRIPTION("ALSA timer interface");
 50 MODULE_LICENSE("GPL");
 51 module_param(timer_limit, int, 0444);
 52 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
 53 module_param(timer_tstamp_monotonic, int, 0444);
 54 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
 55 
 56 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
 57 MODULE_ALIAS("devname:snd/timer");
 58 
 59 struct snd_timer_user {
 60         struct snd_timer_instance *timeri;
 61         int tread;              /* enhanced read with timestamps and events */
 62         unsigned long ticks;
 63         unsigned long overrun;
 64         int qhead;
 65         int qtail;
 66         int qused;
 67         int queue_size;
 68         bool disconnected;
 69         struct snd_timer_read *queue;
 70         struct snd_timer_tread *tqueue;
 71         spinlock_t qlock;
 72         unsigned long last_resolution;
 73         unsigned int filter;
 74         struct timespec tstamp;         /* trigger tstamp */
 75         wait_queue_head_t qchange_sleep;
 76         struct fasync_struct *fasync;
 77         struct mutex ioctl_lock;
 78 };
 79 
 80 /* list of timers */
 81 static LIST_HEAD(snd_timer_list);
 82 
 83 /* list of slave instances */
 84 static LIST_HEAD(snd_timer_slave_list);
 85 
 86 /* lock for slave active lists */
 87 static DEFINE_SPINLOCK(slave_active_lock);
 88 
 89 static DEFINE_MUTEX(register_mutex);
 90 
 91 static int snd_timer_free(struct snd_timer *timer);
 92 static int snd_timer_dev_free(struct snd_device *device);
 93 static int snd_timer_dev_register(struct snd_device *device);
 94 static int snd_timer_dev_disconnect(struct snd_device *device);
 95 
 96 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
 97 
 98 /*
 99  * create a timer instance with the given owner string.
100  * when timer is not NULL, increments the module counter
101  */
102 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
103                                                          struct snd_timer *timer)
104 {
105         struct snd_timer_instance *timeri;
106         timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
107         if (timeri == NULL)
108                 return NULL;
109         timeri->owner = kstrdup(owner, GFP_KERNEL);
110         if (! timeri->owner) {
111                 kfree(timeri);
112                 return NULL;
113         }
114         INIT_LIST_HEAD(&timeri->open_list);
115         INIT_LIST_HEAD(&timeri->active_list);
116         INIT_LIST_HEAD(&timeri->ack_list);
117         INIT_LIST_HEAD(&timeri->slave_list_head);
118         INIT_LIST_HEAD(&timeri->slave_active_head);
119 
120         timeri->timer = timer;
121         if (timer && !try_module_get(timer->module)) {
122                 kfree(timeri->owner);
123                 kfree(timeri);
124                 return NULL;
125         }
126 
127         return timeri;
128 }
129 
130 /*
131  * find a timer instance from the given timer id
132  */
133 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
134 {
135         struct snd_timer *timer = NULL;
136 
137         list_for_each_entry(timer, &snd_timer_list, device_list) {
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_MODULES
155 
156 static void snd_timer_request(struct snd_timer_id *tid)
157 {
158         switch (tid->dev_class) {
159         case SNDRV_TIMER_CLASS_GLOBAL:
160                 if (tid->device < timer_limit)
161                         request_module("snd-timer-%i", tid->device);
162                 break;
163         case SNDRV_TIMER_CLASS_CARD:
164         case SNDRV_TIMER_CLASS_PCM:
165                 if (tid->card < snd_ecards_limit)
166                         request_module("snd-card-%i", tid->card);
167                 break;
168         default:
169                 break;
170         }
171 }
172 
173 #endif
174 
175 /*
176  * look for a master instance matching with the slave id of the given slave.
177  * when found, relink the open_link of the slave.
178  *
179  * call this with register_mutex down.
180  */
181 static void snd_timer_check_slave(struct snd_timer_instance *slave)
182 {
183         struct snd_timer *timer;
184         struct snd_timer_instance *master;
185 
186         /* FIXME: it's really dumb to look up all entries.. */
187         list_for_each_entry(timer, &snd_timer_list, device_list) {
188                 list_for_each_entry(master, &timer->open_list_head, open_list) {
189                         if (slave->slave_class == master->slave_class &&
190                             slave->slave_id == master->slave_id) {
191                                 list_move_tail(&slave->open_list,
192                                                &master->slave_list_head);
193                                 spin_lock_irq(&slave_active_lock);
194                                 slave->master = master;
195                                 slave->timer = master->timer;
196                                 spin_unlock_irq(&slave_active_lock);
197                                 return;
198                         }
199                 }
200         }
201 }
202 
203 /*
204  * look for slave instances matching with the slave id of the given master.
205  * when found, relink the open_link of slaves.
206  *
207  * call this with register_mutex down.
208  */
209 static void snd_timer_check_master(struct snd_timer_instance *master)
210 {
211         struct snd_timer_instance *slave, *tmp;
212 
213         /* check all pending slaves */
214         list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
215                 if (slave->slave_class == master->slave_class &&
216                     slave->slave_id == master->slave_id) {
217                         list_move_tail(&slave->open_list, &master->slave_list_head);
218                         spin_lock_irq(&slave_active_lock);
219                         spin_lock(&master->timer->lock);
220                         slave->master = master;
221                         slave->timer = master->timer;
222                         if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
223                                 list_add_tail(&slave->active_list,
224                                               &master->slave_active_head);
225                         spin_unlock(&master->timer->lock);
226                         spin_unlock_irq(&slave_active_lock);
227                 }
228         }
229 }
230 
231 /*
232  * open a timer instance
233  * when opening a master, the slave id must be here given.
234  */
235 int snd_timer_open(struct snd_timer_instance **ti,
236                    char *owner, struct snd_timer_id *tid,
237                    unsigned int slave_id)
238 {
239         struct snd_timer *timer;
240         struct snd_timer_instance *timeri = NULL;
241 
242         if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
243                 /* open a slave instance */
244                 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
245                     tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
246                         pr_debug("ALSA: timer: invalid slave class %i\n",
247                                  tid->dev_sclass);
248                         return -EINVAL;
249                 }
250                 mutex_lock(&register_mutex);
251                 timeri = snd_timer_instance_new(owner, NULL);
252                 if (!timeri) {
253                         mutex_unlock(&register_mutex);
254                         return -ENOMEM;
255                 }
256                 timeri->slave_class = tid->dev_sclass;
257                 timeri->slave_id = tid->device;
258                 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
259                 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
260                 snd_timer_check_slave(timeri);
261                 mutex_unlock(&register_mutex);
262                 *ti = timeri;
263                 return 0;
264         }
265 
266         /* open a master instance */
267         mutex_lock(&register_mutex);
268         timer = snd_timer_find(tid);
269 #ifdef CONFIG_MODULES
270         if (!timer) {
271                 mutex_unlock(&register_mutex);
272                 snd_timer_request(tid);
273                 mutex_lock(&register_mutex);
274                 timer = snd_timer_find(tid);
275         }
276 #endif
277         if (!timer) {
278                 mutex_unlock(&register_mutex);
279                 return -ENODEV;
280         }
281         if (!list_empty(&timer->open_list_head)) {
282                 timeri = list_entry(timer->open_list_head.next,
283                                     struct snd_timer_instance, open_list);
284                 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
285                         mutex_unlock(&register_mutex);
286                         return -EBUSY;
287                 }
288         }
289         timeri = snd_timer_instance_new(owner, timer);
290         if (!timeri) {
291                 mutex_unlock(&register_mutex);
292                 return -ENOMEM;
293         }
294         /* take a card refcount for safe disconnection */
295         if (timer->card)
296                 get_device(&timer->card->card_dev);
297         timeri->slave_class = tid->dev_sclass;
298         timeri->slave_id = slave_id;
299         if (list_empty(&timer->open_list_head) && timer->hw.open)
300                 timer->hw.open(timer);
301         list_add_tail(&timeri->open_list, &timer->open_list_head);
302         snd_timer_check_master(timeri);
303         mutex_unlock(&register_mutex);
304         *ti = timeri;
305         return 0;
306 }
307 
308 /*
309  * close a timer instance
310  */
311 int snd_timer_close(struct snd_timer_instance *timeri)
312 {
313         struct snd_timer *timer = NULL;
314         struct snd_timer_instance *slave, *tmp;
315 
316         if (snd_BUG_ON(!timeri))
317                 return -ENXIO;
318 
319         mutex_lock(&register_mutex);
320         list_del(&timeri->open_list);
321 
322         /* force to stop the timer */
323         snd_timer_stop(timeri);
324 
325         timer = timeri->timer;
326         if (timer) {
327                 /* wait, until the active callback is finished */
328                 spin_lock_irq(&timer->lock);
329                 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
330                         spin_unlock_irq(&timer->lock);
331                         udelay(10);
332                         spin_lock_irq(&timer->lock);
333                 }
334                 spin_unlock_irq(&timer->lock);
335 
336                 /* remove slave links */
337                 spin_lock_irq(&slave_active_lock);
338                 spin_lock(&timer->lock);
339                 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
340                                          open_list) {
341                         list_move_tail(&slave->open_list, &snd_timer_slave_list);
342                         slave->master = NULL;
343                         slave->timer = NULL;
344                         list_del_init(&slave->ack_list);
345                         list_del_init(&slave->active_list);
346                 }
347                 spin_unlock(&timer->lock);
348                 spin_unlock_irq(&slave_active_lock);
349 
350                 /* slave doesn't need to release timer resources below */
351                 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
352                         timer = NULL;
353         }
354 
355         if (timeri->private_free)
356                 timeri->private_free(timeri);
357         kfree(timeri->owner);
358         kfree(timeri);
359 
360         if (timer) {
361                 if (list_empty(&timer->open_list_head) && timer->hw.close)
362                         timer->hw.close(timer);
363                 /* release a card refcount for safe disconnection */
364                 if (timer->card)
365                         put_device(&timer->card->card_dev);
366                 module_put(timer->module);
367         }
368 
369         mutex_unlock(&register_mutex);
370         return 0;
371 }
372 
373 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
374 {
375         struct snd_timer * timer;
376 
377         if (timeri == NULL)
378                 return 0;
379         if ((timer = timeri->timer) != NULL) {
380                 if (timer->hw.c_resolution)
381                         return timer->hw.c_resolution(timer);
382                 return timer->hw.resolution;
383         }
384         return 0;
385 }
386 
387 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
388 {
389         struct snd_timer *timer;
390         unsigned long resolution = 0;
391         struct snd_timer_instance *ts;
392         struct timespec tstamp;
393 
394         if (timer_tstamp_monotonic)
395                 ktime_get_ts(&tstamp);
396         else
397                 getnstimeofday(&tstamp);
398         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
399                        event > SNDRV_TIMER_EVENT_PAUSE))
400                 return;
401         if (event == SNDRV_TIMER_EVENT_START ||
402             event == SNDRV_TIMER_EVENT_CONTINUE)
403                 resolution = snd_timer_resolution(ti);
404         if (ti->ccallback)
405                 ti->ccallback(ti, event, &tstamp, resolution);
406         if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
407                 return;
408         timer = ti->timer;
409         if (timer == NULL)
410                 return;
411         if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
412                 return;
413         list_for_each_entry(ts, &ti->slave_active_head, active_list)
414                 if (ts->ccallback)
415                         ts->ccallback(ts, event + 100, &tstamp, resolution);
416 }
417 
418 /* start/continue a master timer */
419 static int snd_timer_start1(struct snd_timer_instance *timeri,
420                             bool start, unsigned long ticks)
421 {
422         struct snd_timer *timer;
423         int result;
424         unsigned long flags;
425 
426         timer = timeri->timer;
427         if (!timer)
428                 return -EINVAL;
429 
430         spin_lock_irqsave(&timer->lock, flags);
431         if (timer->card && timer->card->shutdown) {
432                 result = -ENODEV;
433                 goto unlock;
434         }
435         if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
436                              SNDRV_TIMER_IFLG_START)) {
437                 result = -EBUSY;
438                 goto unlock;
439         }
440 
441         if (start)
442                 timeri->ticks = timeri->cticks = ticks;
443         else if (!timeri->cticks)
444                 timeri->cticks = 1;
445         timeri->pticks = 0;
446 
447         list_move_tail(&timeri->active_list, &timer->active_list_head);
448         if (timer->running) {
449                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
450                         goto __start_now;
451                 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
452                 timeri->flags |= SNDRV_TIMER_IFLG_START;
453                 result = 1; /* delayed start */
454         } else {
455                 if (start)
456                         timer->sticks = ticks;
457                 timer->hw.start(timer);
458               __start_now:
459                 timer->running++;
460                 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
461                 result = 0;
462         }
463         snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
464                           SNDRV_TIMER_EVENT_CONTINUE);
465  unlock:
466         spin_unlock_irqrestore(&timer->lock, flags);
467         return result;
468 }
469 
470 /* start/continue a slave timer */
471 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
472                                  bool start)
473 {
474         unsigned long flags;
475 
476         spin_lock_irqsave(&slave_active_lock, flags);
477         if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
478                 spin_unlock_irqrestore(&slave_active_lock, flags);
479                 return -EBUSY;
480         }
481         timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
482         if (timeri->master && timeri->timer) {
483                 spin_lock(&timeri->timer->lock);
484                 list_add_tail(&timeri->active_list,
485                               &timeri->master->slave_active_head);
486                 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
487                                   SNDRV_TIMER_EVENT_CONTINUE);
488                 spin_unlock(&timeri->timer->lock);
489         }
490         spin_unlock_irqrestore(&slave_active_lock, flags);
491         return 1; /* delayed start */
492 }
493 
494 /* stop/pause a master timer */
495 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
496 {
497         struct snd_timer *timer;
498         int result = 0;
499         unsigned long flags;
500 
501         timer = timeri->timer;
502         if (!timer)
503                 return -EINVAL;
504         spin_lock_irqsave(&timer->lock, flags);
505         if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
506                                SNDRV_TIMER_IFLG_START))) {
507                 result = -EBUSY;
508                 goto unlock;
509         }
510         list_del_init(&timeri->ack_list);
511         list_del_init(&timeri->active_list);
512         if (timer->card && timer->card->shutdown)
513                 goto unlock;
514         if (stop) {
515                 timeri->cticks = timeri->ticks;
516                 timeri->pticks = 0;
517         }
518         if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
519             !(--timer->running)) {
520                 timer->hw.stop(timer);
521                 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
522                         timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
523                         snd_timer_reschedule(timer, 0);
524                         if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
525                                 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
526                                 timer->hw.start(timer);
527                         }
528                 }
529         }
530         timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
531         snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
532                           SNDRV_TIMER_EVENT_CONTINUE);
533  unlock:
534         spin_unlock_irqrestore(&timer->lock, flags);
535         return result;
536 }
537 
538 /* stop/pause a slave timer */
539 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
540 {
541         unsigned long flags;
542 
543         spin_lock_irqsave(&slave_active_lock, flags);
544         if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
545                 spin_unlock_irqrestore(&slave_active_lock, flags);
546                 return -EBUSY;
547         }
548         timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
549         if (timeri->timer) {
550                 spin_lock(&timeri->timer->lock);
551                 list_del_init(&timeri->ack_list);
552                 list_del_init(&timeri->active_list);
553                 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
554                                   SNDRV_TIMER_EVENT_CONTINUE);
555                 spin_unlock(&timeri->timer->lock);
556         }
557         spin_unlock_irqrestore(&slave_active_lock, flags);
558         return 0;
559 }
560 
561 /*
562  *  start the timer instance
563  */
564 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
565 {
566         if (timeri == NULL || ticks < 1)
567                 return -EINVAL;
568         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
569                 return snd_timer_start_slave(timeri, true);
570         else
571                 return snd_timer_start1(timeri, true, ticks);
572 }
573 
574 /*
575  * stop the timer instance.
576  *
577  * do not call this from the timer callback!
578  */
579 int snd_timer_stop(struct snd_timer_instance *timeri)
580 {
581         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
582                 return snd_timer_stop_slave(timeri, true);
583         else
584                 return snd_timer_stop1(timeri, true);
585 }
586 
587 /*
588  * start again..  the tick is kept.
589  */
590 int snd_timer_continue(struct snd_timer_instance *timeri)
591 {
592         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
593                 return snd_timer_start_slave(timeri, false);
594         else
595                 return snd_timer_start1(timeri, false, 0);
596 }
597 
598 /*
599  * pause.. remember the ticks left
600  */
601 int snd_timer_pause(struct snd_timer_instance * timeri)
602 {
603         if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
604                 return snd_timer_stop_slave(timeri, false);
605         else
606                 return snd_timer_stop1(timeri, false);
607 }
608 
609 /*
610  * reschedule the timer
611  *
612  * start pending instances and check the scheduling ticks.
613  * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
614  */
615 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
616 {
617         struct snd_timer_instance *ti;
618         unsigned long ticks = ~0UL;
619 
620         list_for_each_entry(ti, &timer->active_list_head, active_list) {
621                 if (ti->flags & SNDRV_TIMER_IFLG_START) {
622                         ti->flags &= ~SNDRV_TIMER_IFLG_START;
623                         ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
624                         timer->running++;
625                 }
626                 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
627                         if (ticks > ti->cticks)
628                                 ticks = ti->cticks;
629                 }
630         }
631         if (ticks == ~0UL) {
632                 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
633                 return;
634         }
635         if (ticks > timer->hw.ticks)
636                 ticks = timer->hw.ticks;
637         if (ticks_left != ticks)
638                 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
639         timer->sticks = ticks;
640 }
641 
642 /*
643  * timer tasklet
644  *
645  */
646 static void snd_timer_tasklet(unsigned long arg)
647 {
648         struct snd_timer *timer = (struct snd_timer *) arg;
649         struct snd_timer_instance *ti;
650         struct list_head *p;
651         unsigned long resolution, ticks;
652         unsigned long flags;
653 
654         if (timer->card && timer->card->shutdown)
655                 return;
656 
657         spin_lock_irqsave(&timer->lock, flags);
658         /* now process all callbacks */
659         while (!list_empty(&timer->sack_list_head)) {
660                 p = timer->sack_list_head.next;         /* get first item */
661                 ti = list_entry(p, struct snd_timer_instance, ack_list);
662 
663                 /* remove from ack_list and make empty */
664                 list_del_init(p);
665 
666                 ticks = ti->pticks;
667                 ti->pticks = 0;
668                 resolution = ti->resolution;
669 
670                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
671                 spin_unlock(&timer->lock);
672                 if (ti->callback)
673                         ti->callback(ti, resolution, ticks);
674                 spin_lock(&timer->lock);
675                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
676         }
677         spin_unlock_irqrestore(&timer->lock, flags);
678 }
679 
680 /*
681  * timer interrupt
682  *
683  * ticks_left is usually equal to timer->sticks.
684  *
685  */
686 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
687 {
688         struct snd_timer_instance *ti, *ts, *tmp;
689         unsigned long resolution, ticks;
690         struct list_head *p, *ack_list_head;
691         unsigned long flags;
692         int use_tasklet = 0;
693 
694         if (timer == NULL)
695                 return;
696 
697         if (timer->card && timer->card->shutdown)
698                 return;
699 
700         spin_lock_irqsave(&timer->lock, flags);
701 
702         /* remember the current resolution */
703         if (timer->hw.c_resolution)
704                 resolution = timer->hw.c_resolution(timer);
705         else
706                 resolution = timer->hw.resolution;
707 
708         /* loop for all active instances
709          * Here we cannot use list_for_each_entry because the active_list of a
710          * processed instance is relinked to done_list_head before the callback
711          * is called.
712          */
713         list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
714                                  active_list) {
715                 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
716                         continue;
717                 ti->pticks += ticks_left;
718                 ti->resolution = resolution;
719                 if (ti->cticks < ticks_left)
720                         ti->cticks = 0;
721                 else
722                         ti->cticks -= ticks_left;
723                 if (ti->cticks) /* not expired */
724                         continue;
725                 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
726                         ti->cticks = ti->ticks;
727                 } else {
728                         ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
729                         --timer->running;
730                         list_del_init(&ti->active_list);
731                 }
732                 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
733                     (ti->flags & SNDRV_TIMER_IFLG_FAST))
734                         ack_list_head = &timer->ack_list_head;
735                 else
736                         ack_list_head = &timer->sack_list_head;
737                 if (list_empty(&ti->ack_list))
738                         list_add_tail(&ti->ack_list, ack_list_head);
739                 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
740                         ts->pticks = ti->pticks;
741                         ts->resolution = resolution;
742                         if (list_empty(&ts->ack_list))
743                                 list_add_tail(&ts->ack_list, ack_list_head);
744                 }
745         }
746         if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
747                 snd_timer_reschedule(timer, timer->sticks);
748         if (timer->running) {
749                 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
750                         timer->hw.stop(timer);
751                         timer->flags |= SNDRV_TIMER_FLG_CHANGE;
752                 }
753                 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
754                     (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
755                         /* restart timer */
756                         timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
757                         timer->hw.start(timer);
758                 }
759         } else {
760                 timer->hw.stop(timer);
761         }
762 
763         /* now process all fast callbacks */
764         while (!list_empty(&timer->ack_list_head)) {
765                 p = timer->ack_list_head.next;          /* get first item */
766                 ti = list_entry(p, struct snd_timer_instance, ack_list);
767 
768                 /* remove from ack_list and make empty */
769                 list_del_init(p);
770 
771                 ticks = ti->pticks;
772                 ti->pticks = 0;
773 
774                 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
775                 spin_unlock(&timer->lock);
776                 if (ti->callback)
777                         ti->callback(ti, resolution, ticks);
778                 spin_lock(&timer->lock);
779                 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
780         }
781 
782         /* do we have any slow callbacks? */
783         use_tasklet = !list_empty(&timer->sack_list_head);
784         spin_unlock_irqrestore(&timer->lock, flags);
785 
786         if (use_tasklet)
787                 tasklet_schedule(&timer->task_queue);
788 }
789 
790 /*
791 
792  */
793 
794 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
795                   struct snd_timer **rtimer)
796 {
797         struct snd_timer *timer;
798         int err;
799         static struct snd_device_ops ops = {
800                 .dev_free = snd_timer_dev_free,
801                 .dev_register = snd_timer_dev_register,
802                 .dev_disconnect = snd_timer_dev_disconnect,
803         };
804 
805         if (snd_BUG_ON(!tid))
806                 return -EINVAL;
807         if (rtimer)
808                 *rtimer = NULL;
809         timer = kzalloc(sizeof(*timer), GFP_KERNEL);
810         if (!timer)
811                 return -ENOMEM;
812         timer->tmr_class = tid->dev_class;
813         timer->card = card;
814         timer->tmr_device = tid->device;
815         timer->tmr_subdevice = tid->subdevice;
816         if (id)
817                 strlcpy(timer->id, id, sizeof(timer->id));
818         INIT_LIST_HEAD(&timer->device_list);
819         INIT_LIST_HEAD(&timer->open_list_head);
820         INIT_LIST_HEAD(&timer->active_list_head);
821         INIT_LIST_HEAD(&timer->ack_list_head);
822         INIT_LIST_HEAD(&timer->sack_list_head);
823         spin_lock_init(&timer->lock);
824         tasklet_init(&timer->task_queue, snd_timer_tasklet,
825                      (unsigned long)timer);
826         if (card != NULL) {
827                 timer->module = card->module;
828                 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
829                 if (err < 0) {
830                         snd_timer_free(timer);
831                         return err;
832                 }
833         }
834         if (rtimer)
835                 *rtimer = timer;
836         return 0;
837 }
838 
839 static int snd_timer_free(struct snd_timer *timer)
840 {
841         if (!timer)
842                 return 0;
843 
844         mutex_lock(&register_mutex);
845         if (! list_empty(&timer->open_list_head)) {
846                 struct list_head *p, *n;
847                 struct snd_timer_instance *ti;
848                 pr_warn("ALSA: timer %p is busy?\n", timer);
849                 list_for_each_safe(p, n, &timer->open_list_head) {
850                         list_del_init(p);
851                         ti = list_entry(p, struct snd_timer_instance, open_list);
852                         ti->timer = NULL;
853                 }
854         }
855         list_del(&timer->device_list);
856         mutex_unlock(&register_mutex);
857 
858         if (timer->private_free)
859                 timer->private_free(timer);
860         kfree(timer);
861         return 0;
862 }
863 
864 static int snd_timer_dev_free(struct snd_device *device)
865 {
866         struct snd_timer *timer = device->device_data;
867         return snd_timer_free(timer);
868 }
869 
870 static int snd_timer_dev_register(struct snd_device *dev)
871 {
872         struct snd_timer *timer = dev->device_data;
873         struct snd_timer *timer1;
874 
875         if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
876                 return -ENXIO;
877         if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
878             !timer->hw.resolution && timer->hw.c_resolution == NULL)
879                 return -EINVAL;
880 
881         mutex_lock(&register_mutex);
882         list_for_each_entry(timer1, &snd_timer_list, device_list) {
883                 if (timer1->tmr_class > timer->tmr_class)
884                         break;
885                 if (timer1->tmr_class < timer->tmr_class)
886                         continue;
887                 if (timer1->card && timer->card) {
888                         if (timer1->card->number > timer->card->number)
889                                 break;
890                         if (timer1->card->number < timer->card->number)
891                                 continue;
892                 }
893                 if (timer1->tmr_device > timer->tmr_device)
894                         break;
895                 if (timer1->tmr_device < timer->tmr_device)
896                         continue;
897                 if (timer1->tmr_subdevice > timer->tmr_subdevice)
898                         break;
899                 if (timer1->tmr_subdevice < timer->tmr_subdevice)
900                         continue;
901                 /* conflicts.. */
902                 mutex_unlock(&register_mutex);
903                 return -EBUSY;
904         }
905         list_add_tail(&timer->device_list, &timer1->device_list);
906         mutex_unlock(&register_mutex);
907         return 0;
908 }
909 
910 static int snd_timer_dev_disconnect(struct snd_device *device)
911 {
912         struct snd_timer *timer = device->device_data;
913         struct snd_timer_instance *ti;
914 
915         mutex_lock(&register_mutex);
916         list_del_init(&timer->device_list);
917         /* wake up pending sleepers */
918         list_for_each_entry(ti, &timer->open_list_head, open_list) {
919                 if (ti->disconnect)
920                         ti->disconnect(ti);
921         }
922         mutex_unlock(&register_mutex);
923         return 0;
924 }
925 
926 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
927 {
928         unsigned long flags;
929         unsigned long resolution = 0;
930         struct snd_timer_instance *ti, *ts;
931 
932         if (timer->card && timer->card->shutdown)
933                 return;
934         if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
935                 return;
936         if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
937                        event > SNDRV_TIMER_EVENT_MRESUME))
938                 return;
939         spin_lock_irqsave(&timer->lock, flags);
940         if (event == SNDRV_TIMER_EVENT_MSTART ||
941             event == SNDRV_TIMER_EVENT_MCONTINUE ||
942             event == SNDRV_TIMER_EVENT_MRESUME) {
943                 if (timer->hw.c_resolution)
944                         resolution = timer->hw.c_resolution(timer);
945                 else
946                         resolution = timer->hw.resolution;
947         }
948         list_for_each_entry(ti, &timer->active_list_head, active_list) {
949                 if (ti->ccallback)
950                         ti->ccallback(ti, event, tstamp, resolution);
951                 list_for_each_entry(ts, &ti->slave_active_head, active_list)
952                         if (ts->ccallback)
953                                 ts->ccallback(ts, event, tstamp, resolution);
954         }
955         spin_unlock_irqrestore(&timer->lock, flags);
956 }
957 
958 /*
959  * exported functions for global timers
960  */
961 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
962 {
963         struct snd_timer_id tid;
964 
965         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
966         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
967         tid.card = -1;
968         tid.device = device;
969         tid.subdevice = 0;
970         return snd_timer_new(NULL, id, &tid, rtimer);
971 }
972 
973 int snd_timer_global_free(struct snd_timer *timer)
974 {
975         return snd_timer_free(timer);
976 }
977 
978 int snd_timer_global_register(struct snd_timer *timer)
979 {
980         struct snd_device dev;
981 
982         memset(&dev, 0, sizeof(dev));
983         dev.device_data = timer;
984         return snd_timer_dev_register(&dev);
985 }
986 
987 /*
988  *  System timer
989  */
990 
991 struct snd_timer_system_private {
992         struct timer_list tlist;
993         unsigned long last_expires;
994         unsigned long last_jiffies;
995         unsigned long correction;
996 };
997 
998 static void snd_timer_s_function(unsigned long data)
999 {
1000         struct snd_timer *timer = (struct snd_timer *)data;
1001         struct snd_timer_system_private *priv = timer->private_data;
1002         unsigned long jiff = jiffies;
1003         if (time_after(jiff, priv->last_expires))
1004                 priv->correction += (long)jiff - (long)priv->last_expires;
1005         snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1006 }
1007 
1008 static int snd_timer_s_start(struct snd_timer * timer)
1009 {
1010         struct snd_timer_system_private *priv;
1011         unsigned long njiff;
1012 
1013         priv = (struct snd_timer_system_private *) timer->private_data;
1014         njiff = (priv->last_jiffies = jiffies);
1015         if (priv->correction > timer->sticks - 1) {
1016                 priv->correction -= timer->sticks - 1;
1017                 njiff++;
1018         } else {
1019                 njiff += timer->sticks - priv->correction;
1020                 priv->correction = 0;
1021         }
1022         priv->last_expires = njiff;
1023         mod_timer(&priv->tlist, njiff);
1024         return 0;
1025 }
1026 
1027 static int snd_timer_s_stop(struct snd_timer * timer)
1028 {
1029         struct snd_timer_system_private *priv;
1030         unsigned long jiff;
1031 
1032         priv = (struct snd_timer_system_private *) timer->private_data;
1033         del_timer(&priv->tlist);
1034         jiff = jiffies;
1035         if (time_before(jiff, priv->last_expires))
1036                 timer->sticks = priv->last_expires - jiff;
1037         else
1038                 timer->sticks = 1;
1039         priv->correction = 0;
1040         return 0;
1041 }
1042 
1043 static int snd_timer_s_close(struct snd_timer *timer)
1044 {
1045         struct snd_timer_system_private *priv;
1046 
1047         priv = (struct snd_timer_system_private *)timer->private_data;
1048         del_timer_sync(&priv->tlist);
1049         return 0;
1050 }
1051 
1052 static struct snd_timer_hardware snd_timer_system =
1053 {
1054         .flags =        SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1055         .resolution =   1000000000L / HZ,
1056         .ticks =        10000000L,
1057         .close =        snd_timer_s_close,
1058         .start =        snd_timer_s_start,
1059         .stop =         snd_timer_s_stop
1060 };
1061 
1062 static void snd_timer_free_system(struct snd_timer *timer)
1063 {
1064         kfree(timer->private_data);
1065 }
1066 
1067 static int snd_timer_register_system(void)
1068 {
1069         struct snd_timer *timer;
1070         struct snd_timer_system_private *priv;
1071         int err;
1072 
1073         err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1074         if (err < 0)
1075                 return err;
1076         strcpy(timer->name, "system timer");
1077         timer->hw = snd_timer_system;
1078         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1079         if (priv == NULL) {
1080                 snd_timer_free(timer);
1081                 return -ENOMEM;
1082         }
1083         setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
1084         timer->private_data = priv;
1085         timer->private_free = snd_timer_free_system;
1086         return snd_timer_global_register(timer);
1087 }
1088 
1089 #ifdef CONFIG_SND_PROC_FS
1090 /*
1091  *  Info interface
1092  */
1093 
1094 static void snd_timer_proc_read(struct snd_info_entry *entry,
1095                                 struct snd_info_buffer *buffer)
1096 {
1097         struct snd_timer *timer;
1098         struct snd_timer_instance *ti;
1099 
1100         mutex_lock(&register_mutex);
1101         list_for_each_entry(timer, &snd_timer_list, device_list) {
1102                 if (timer->card && timer->card->shutdown)
1103                         continue;
1104                 switch (timer->tmr_class) {
1105                 case SNDRV_TIMER_CLASS_GLOBAL:
1106                         snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1107                         break;
1108                 case SNDRV_TIMER_CLASS_CARD:
1109                         snd_iprintf(buffer, "C%i-%i: ",
1110                                     timer->card->number, timer->tmr_device);
1111                         break;
1112                 case SNDRV_TIMER_CLASS_PCM:
1113                         snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1114                                     timer->tmr_device, timer->tmr_subdevice);
1115                         break;
1116                 default:
1117                         snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1118                                     timer->card ? timer->card->number : -1,
1119                                     timer->tmr_device, timer->tmr_subdevice);
1120                 }
1121                 snd_iprintf(buffer, "%s :", timer->name);
1122                 if (timer->hw.resolution)
1123                         snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1124                                     timer->hw.resolution / 1000,
1125                                     timer->hw.resolution % 1000,
1126                                     timer->hw.ticks);
1127                 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1128                         snd_iprintf(buffer, " SLAVE");
1129                 snd_iprintf(buffer, "\n");
1130                 list_for_each_entry(ti, &timer->open_list_head, open_list)
1131                         snd_iprintf(buffer, "  Client %s : %s\n",
1132                                     ti->owner ? ti->owner : "unknown",
1133                                     ti->flags & (SNDRV_TIMER_IFLG_START |
1134                                                  SNDRV_TIMER_IFLG_RUNNING)
1135                                     ? "running" : "stopped");
1136         }
1137         mutex_unlock(&register_mutex);
1138 }
1139 
1140 static struct snd_info_entry *snd_timer_proc_entry;
1141 
1142 static void __init snd_timer_proc_init(void)
1143 {
1144         struct snd_info_entry *entry;
1145 
1146         entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1147         if (entry != NULL) {
1148                 entry->c.text.read = snd_timer_proc_read;
1149                 if (snd_info_register(entry) < 0) {
1150                         snd_info_free_entry(entry);
1151                         entry = NULL;
1152                 }
1153         }
1154         snd_timer_proc_entry = entry;
1155 }
1156 
1157 static void __exit snd_timer_proc_done(void)
1158 {
1159         snd_info_free_entry(snd_timer_proc_entry);
1160 }
1161 #else /* !CONFIG_SND_PROC_FS */
1162 #define snd_timer_proc_init()
1163 #define snd_timer_proc_done()
1164 #endif
1165 
1166 /*
1167  *  USER SPACE interface
1168  */
1169 
1170 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1171                                      unsigned long resolution,
1172                                      unsigned long ticks)
1173 {
1174         struct snd_timer_user *tu = timeri->callback_data;
1175         struct snd_timer_read *r;
1176         int prev;
1177 
1178         spin_lock(&tu->qlock);
1179         if (tu->qused > 0) {
1180                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1181                 r = &tu->queue[prev];
1182                 if (r->resolution == resolution) {
1183                         r->ticks += ticks;
1184                         goto __wake;
1185                 }
1186         }
1187         if (tu->qused >= tu->queue_size) {
1188                 tu->overrun++;
1189         } else {
1190                 r = &tu->queue[tu->qtail++];
1191                 tu->qtail %= tu->queue_size;
1192                 r->resolution = resolution;
1193                 r->ticks = ticks;
1194                 tu->qused++;
1195         }
1196       __wake:
1197         spin_unlock(&tu->qlock);
1198         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1199         wake_up(&tu->qchange_sleep);
1200 }
1201 
1202 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1203                                             struct snd_timer_tread *tread)
1204 {
1205         if (tu->qused >= tu->queue_size) {
1206                 tu->overrun++;
1207         } else {
1208                 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1209                 tu->qtail %= tu->queue_size;
1210                 tu->qused++;
1211         }
1212 }
1213 
1214 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1215                                      int event,
1216                                      struct timespec *tstamp,
1217                                      unsigned long resolution)
1218 {
1219         struct snd_timer_user *tu = timeri->callback_data;
1220         struct snd_timer_tread r1;
1221         unsigned long flags;
1222 
1223         if (event >= SNDRV_TIMER_EVENT_START &&
1224             event <= SNDRV_TIMER_EVENT_PAUSE)
1225                 tu->tstamp = *tstamp;
1226         if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1227                 return;
1228         memset(&r1, 0, sizeof(r1));
1229         r1.event = event;
1230         r1.tstamp = *tstamp;
1231         r1.val = resolution;
1232         spin_lock_irqsave(&tu->qlock, flags);
1233         snd_timer_user_append_to_tqueue(tu, &r1);
1234         spin_unlock_irqrestore(&tu->qlock, flags);
1235         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1236         wake_up(&tu->qchange_sleep);
1237 }
1238 
1239 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1240 {
1241         struct snd_timer_user *tu = timeri->callback_data;
1242 
1243         tu->disconnected = true;
1244         wake_up(&tu->qchange_sleep);
1245 }
1246 
1247 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1248                                       unsigned long resolution,
1249                                       unsigned long ticks)
1250 {
1251         struct snd_timer_user *tu = timeri->callback_data;
1252         struct snd_timer_tread *r, r1;
1253         struct timespec tstamp;
1254         int prev, append = 0;
1255 
1256         memset(&tstamp, 0, sizeof(tstamp));
1257         spin_lock(&tu->qlock);
1258         if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1259                            (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1260                 spin_unlock(&tu->qlock);
1261                 return;
1262         }
1263         if (tu->last_resolution != resolution || ticks > 0) {
1264                 if (timer_tstamp_monotonic)
1265                         ktime_get_ts(&tstamp);
1266                 else
1267                         getnstimeofday(&tstamp);
1268         }
1269         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1270             tu->last_resolution != resolution) {
1271                 memset(&r1, 0, sizeof(r1));
1272                 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1273                 r1.tstamp = tstamp;
1274                 r1.val = resolution;
1275                 snd_timer_user_append_to_tqueue(tu, &r1);
1276                 tu->last_resolution = resolution;
1277                 append++;
1278         }
1279         if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1280                 goto __wake;
1281         if (ticks == 0)
1282                 goto __wake;
1283         if (tu->qused > 0) {
1284                 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1285                 r = &tu->tqueue[prev];
1286                 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1287                         r->tstamp = tstamp;
1288                         r->val += ticks;
1289                         append++;
1290                         goto __wake;
1291                 }
1292         }
1293         r1.event = SNDRV_TIMER_EVENT_TICK;
1294         r1.tstamp = tstamp;
1295         r1.val = ticks;
1296         snd_timer_user_append_to_tqueue(tu, &r1);
1297         append++;
1298       __wake:
1299         spin_unlock(&tu->qlock);
1300         if (append == 0)
1301                 return;
1302         kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1303         wake_up(&tu->qchange_sleep);
1304 }
1305 
1306 static int snd_timer_user_open(struct inode *inode, struct file *file)
1307 {
1308         struct snd_timer_user *tu;
1309         int err;
1310 
1311         err = nonseekable_open(inode, file);
1312         if (err < 0)
1313                 return err;
1314 
1315         tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1316         if (tu == NULL)
1317                 return -ENOMEM;
1318         spin_lock_init(&tu->qlock);
1319         init_waitqueue_head(&tu->qchange_sleep);
1320         mutex_init(&tu->ioctl_lock);
1321         tu->ticks = 1;
1322         tu->queue_size = 128;
1323         tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1324                             GFP_KERNEL);
1325         if (tu->queue == NULL) {
1326                 kfree(tu);
1327                 return -ENOMEM;
1328         }
1329         file->private_data = tu;
1330         return 0;
1331 }
1332 
1333 static int snd_timer_user_release(struct inode *inode, struct file *file)
1334 {
1335         struct snd_timer_user *tu;
1336 
1337         if (file->private_data) {
1338                 tu = file->private_data;
1339                 file->private_data = NULL;
1340                 mutex_lock(&tu->ioctl_lock);
1341                 if (tu->timeri)
1342                         snd_timer_close(tu->timeri);
1343                 mutex_unlock(&tu->ioctl_lock);
1344                 kfree(tu->queue);
1345                 kfree(tu->tqueue);
1346                 kfree(tu);
1347         }
1348         return 0;
1349 }
1350 
1351 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1352 {
1353         id->dev_class = SNDRV_TIMER_CLASS_NONE;
1354         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1355         id->card = -1;
1356         id->device = -1;
1357         id->subdevice = -1;
1358 }
1359 
1360 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1361 {
1362         id->dev_class = timer->tmr_class;
1363         id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1364         id->card = timer->card ? timer->card->number : -1;
1365         id->device = timer->tmr_device;
1366         id->subdevice = timer->tmr_subdevice;
1367 }
1368 
1369 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1370 {
1371         struct snd_timer_id id;
1372         struct snd_timer *timer;
1373         struct list_head *p;
1374 
1375         if (copy_from_user(&id, _tid, sizeof(id)))
1376                 return -EFAULT;
1377         mutex_lock(&register_mutex);
1378         if (id.dev_class < 0) {         /* first item */
1379                 if (list_empty(&snd_timer_list))
1380                         snd_timer_user_zero_id(&id);
1381                 else {
1382                         timer = list_entry(snd_timer_list.next,
1383                                            struct snd_timer, device_list);
1384                         snd_timer_user_copy_id(&id, timer);
1385                 }
1386         } else {
1387                 switch (id.dev_class) {
1388                 case SNDRV_TIMER_CLASS_GLOBAL:
1389                         id.device = id.device < 0 ? 0 : id.device + 1;
1390                         list_for_each(p, &snd_timer_list) {
1391                                 timer = list_entry(p, struct snd_timer, device_list);
1392                                 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1393                                         snd_timer_user_copy_id(&id, timer);
1394                                         break;
1395                                 }
1396                                 if (timer->tmr_device >= id.device) {
1397                                         snd_timer_user_copy_id(&id, timer);
1398                                         break;
1399                                 }
1400                         }
1401                         if (p == &snd_timer_list)
1402                                 snd_timer_user_zero_id(&id);
1403                         break;
1404                 case SNDRV_TIMER_CLASS_CARD:
1405                 case SNDRV_TIMER_CLASS_PCM:
1406                         if (id.card < 0) {
1407                                 id.card = 0;
1408                         } else {
1409                                 if (id.card < 0) {
1410                                         id.card = 0;
1411                                 } else {
1412                                         if (id.device < 0) {
1413                                                 id.device = 0;
1414                                         } else {
1415                                                 if (id.subdevice < 0) {
1416                                                         id.subdevice = 0;
1417                                                 } else {
1418                                                         id.subdevice++;
1419                                                 }
1420                                         }
1421                                 }
1422                         }
1423                         list_for_each(p, &snd_timer_list) {
1424                                 timer = list_entry(p, struct snd_timer, device_list);
1425                                 if (timer->tmr_class > id.dev_class) {
1426                                         snd_timer_user_copy_id(&id, timer);
1427                                         break;
1428                                 }
1429                                 if (timer->tmr_class < id.dev_class)
1430                                         continue;
1431                                 if (timer->card->number > id.card) {
1432                                         snd_timer_user_copy_id(&id, timer);
1433                                         break;
1434                                 }
1435                                 if (timer->card->number < id.card)
1436                                         continue;
1437                                 if (timer->tmr_device > id.device) {
1438                                         snd_timer_user_copy_id(&id, timer);
1439                                         break;
1440                                 }
1441                                 if (timer->tmr_device < id.device)
1442                                         continue;
1443                                 if (timer->tmr_subdevice > id.subdevice) {
1444                                         snd_timer_user_copy_id(&id, timer);
1445                                         break;
1446                                 }
1447                                 if (timer->tmr_subdevice < id.subdevice)
1448                                         continue;
1449                                 snd_timer_user_copy_id(&id, timer);
1450                                 break;
1451                         }
1452                         if (p == &snd_timer_list)
1453                                 snd_timer_user_zero_id(&id);
1454                         break;
1455                 default:
1456                         snd_timer_user_zero_id(&id);
1457                 }
1458         }
1459         mutex_unlock(&register_mutex);
1460         if (copy_to_user(_tid, &id, sizeof(*_tid)))
1461                 return -EFAULT;
1462         return 0;
1463 }
1464 
1465 static int snd_timer_user_ginfo(struct file *file,
1466                                 struct snd_timer_ginfo __user *_ginfo)
1467 {
1468         struct snd_timer_ginfo *ginfo;
1469         struct snd_timer_id tid;
1470         struct snd_timer *t;
1471         struct list_head *p;
1472         int err = 0;
1473 
1474         ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1475         if (IS_ERR(ginfo))
1476                 return PTR_ERR(ginfo);
1477 
1478         tid = ginfo->tid;
1479         memset(ginfo, 0, sizeof(*ginfo));
1480         ginfo->tid = tid;
1481         mutex_lock(&register_mutex);
1482         t = snd_timer_find(&tid);
1483         if (t != NULL) {
1484                 ginfo->card = t->card ? t->card->number : -1;
1485                 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1486                         ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1487                 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1488                 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1489                 ginfo->resolution = t->hw.resolution;
1490                 if (t->hw.resolution_min > 0) {
1491                         ginfo->resolution_min = t->hw.resolution_min;
1492                         ginfo->resolution_max = t->hw.resolution_max;
1493                 }
1494                 list_for_each(p, &t->open_list_head) {
1495                         ginfo->clients++;
1496                 }
1497         } else {
1498                 err = -ENODEV;
1499         }
1500         mutex_unlock(&register_mutex);
1501         if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1502                 err = -EFAULT;
1503         kfree(ginfo);
1504         return err;
1505 }
1506 
1507 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1508 {
1509         struct snd_timer *t;
1510         int err;
1511 
1512         mutex_lock(&register_mutex);
1513         t = snd_timer_find(&gparams->tid);
1514         if (!t) {
1515                 err = -ENODEV;
1516                 goto _error;
1517         }
1518         if (!list_empty(&t->open_list_head)) {
1519                 err = -EBUSY;
1520                 goto _error;
1521         }
1522         if (!t->hw.set_period) {
1523                 err = -ENOSYS;
1524                 goto _error;
1525         }
1526         err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1527 _error:
1528         mutex_unlock(&register_mutex);
1529         return err;
1530 }
1531 
1532 static int snd_timer_user_gparams(struct file *file,
1533                                   struct snd_timer_gparams __user *_gparams)
1534 {
1535         struct snd_timer_gparams gparams;
1536 
1537         if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1538                 return -EFAULT;
1539         return timer_set_gparams(&gparams);
1540 }
1541 
1542 static int snd_timer_user_gstatus(struct file *file,
1543                                   struct snd_timer_gstatus __user *_gstatus)
1544 {
1545         struct snd_timer_gstatus gstatus;
1546         struct snd_timer_id tid;
1547         struct snd_timer *t;
1548         int err = 0;
1549 
1550         if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1551                 return -EFAULT;
1552         tid = gstatus.tid;
1553         memset(&gstatus, 0, sizeof(gstatus));
1554         gstatus.tid = tid;
1555         mutex_lock(&register_mutex);
1556         t = snd_timer_find(&tid);
1557         if (t != NULL) {
1558                 if (t->hw.c_resolution)
1559                         gstatus.resolution = t->hw.c_resolution(t);
1560                 else
1561                         gstatus.resolution = t->hw.resolution;
1562                 if (t->hw.precise_resolution) {
1563                         t->hw.precise_resolution(t, &gstatus.resolution_num,
1564                                                  &gstatus.resolution_den);
1565                 } else {
1566                         gstatus.resolution_num = gstatus.resolution;
1567                         gstatus.resolution_den = 1000000000uL;
1568                 }
1569         } else {
1570                 err = -ENODEV;
1571         }
1572         mutex_unlock(&register_mutex);
1573         if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1574                 err = -EFAULT;
1575         return err;
1576 }
1577 
1578 static int snd_timer_user_tselect(struct file *file,
1579                                   struct snd_timer_select __user *_tselect)
1580 {
1581         struct snd_timer_user *tu;
1582         struct snd_timer_select tselect;
1583         char str[32];
1584         int err = 0;
1585 
1586         tu = file->private_data;
1587         if (tu->timeri) {
1588                 snd_timer_close(tu->timeri);
1589                 tu->timeri = NULL;
1590         }
1591         if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1592                 err = -EFAULT;
1593                 goto __err;
1594         }
1595         sprintf(str, "application %i", current->pid);
1596         if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1597                 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1598         err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1599         if (err < 0)
1600                 goto __err;
1601 
1602         kfree(tu->queue);
1603         tu->queue = NULL;
1604         kfree(tu->tqueue);
1605         tu->tqueue = NULL;
1606         if (tu->tread) {
1607                 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1608                                      GFP_KERNEL);
1609                 if (tu->tqueue == NULL)
1610                         err = -ENOMEM;
1611         } else {
1612                 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1613                                     GFP_KERNEL);
1614                 if (tu->queue == NULL)
1615                         err = -ENOMEM;
1616         }
1617 
1618         if (err < 0) {
1619                 snd_timer_close(tu->timeri);
1620                 tu->timeri = NULL;
1621         } else {
1622                 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1623                 tu->timeri->callback = tu->tread
1624                         ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1625                 tu->timeri->ccallback = snd_timer_user_ccallback;
1626                 tu->timeri->callback_data = (void *)tu;
1627                 tu->timeri->disconnect = snd_timer_user_disconnect;
1628         }
1629 
1630       __err:
1631         return err;
1632 }
1633 
1634 static int snd_timer_user_info(struct file *file,
1635                                struct snd_timer_info __user *_info)
1636 {
1637         struct snd_timer_user *tu;
1638         struct snd_timer_info *info;
1639         struct snd_timer *t;
1640         int err = 0;
1641 
1642         tu = file->private_data;
1643         if (!tu->timeri)
1644                 return -EBADFD;
1645         t = tu->timeri->timer;
1646         if (!t)
1647                 return -EBADFD;
1648 
1649         info = kzalloc(sizeof(*info), GFP_KERNEL);
1650         if (! info)
1651                 return -ENOMEM;
1652         info->card = t->card ? t->card->number : -1;
1653         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1654                 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1655         strlcpy(info->id, t->id, sizeof(info->id));
1656         strlcpy(info->name, t->name, sizeof(info->name));
1657         info->resolution = t->hw.resolution;
1658         if (copy_to_user(_info, info, sizeof(*_info)))
1659                 err = -EFAULT;
1660         kfree(info);
1661         return err;
1662 }
1663 
1664 static int snd_timer_user_params(struct file *file,
1665                                  struct snd_timer_params __user *_params)
1666 {
1667         struct snd_timer_user *tu;
1668         struct snd_timer_params params;
1669         struct snd_timer *t;
1670         struct snd_timer_read *tr;
1671         struct snd_timer_tread *ttr;
1672         int err;
1673 
1674         tu = file->private_data;
1675         if (!tu->timeri)
1676                 return -EBADFD;
1677         t = tu->timeri->timer;
1678         if (!t)
1679                 return -EBADFD;
1680         if (copy_from_user(&params, _params, sizeof(params)))
1681                 return -EFAULT;
1682         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1683                 err = -EINVAL;
1684                 goto _end;
1685         }
1686         if (params.queue_size > 0 &&
1687             (params.queue_size < 32 || params.queue_size > 1024)) {
1688                 err = -EINVAL;
1689                 goto _end;
1690         }
1691         if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1692                               (1<<SNDRV_TIMER_EVENT_TICK)|
1693                               (1<<SNDRV_TIMER_EVENT_START)|
1694                               (1<<SNDRV_TIMER_EVENT_STOP)|
1695                               (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1696                               (1<<SNDRV_TIMER_EVENT_PAUSE)|
1697                               (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1698                               (1<<SNDRV_TIMER_EVENT_RESUME)|
1699                               (1<<SNDRV_TIMER_EVENT_MSTART)|
1700                               (1<<SNDRV_TIMER_EVENT_MSTOP)|
1701                               (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1702                               (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1703                               (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1704                               (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1705                 err = -EINVAL;
1706                 goto _end;
1707         }
1708         snd_timer_stop(tu->timeri);
1709         spin_lock_irq(&t->lock);
1710         tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1711                                SNDRV_TIMER_IFLG_EXCLUSIVE|
1712                                SNDRV_TIMER_IFLG_EARLY_EVENT);
1713         if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1714                 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1715         if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1716                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1717         if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1718                 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1719         spin_unlock_irq(&t->lock);
1720         if (params.queue_size > 0 &&
1721             (unsigned int)tu->queue_size != params.queue_size) {
1722                 if (tu->tread) {
1723                         ttr = kmalloc(params.queue_size * sizeof(*ttr),
1724                                       GFP_KERNEL);
1725                         if (ttr) {
1726                                 kfree(tu->tqueue);
1727                                 tu->queue_size = params.queue_size;
1728                                 tu->tqueue = ttr;
1729                         }
1730                 } else {
1731                         tr = kmalloc(params.queue_size * sizeof(*tr),
1732                                      GFP_KERNEL);
1733                         if (tr) {
1734                                 kfree(tu->queue);
1735                                 tu->queue_size = params.queue_size;
1736                                 tu->queue = tr;
1737                         }
1738                 }
1739         }
1740         tu->qhead = tu->qtail = tu->qused = 0;
1741         if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1742                 if (tu->tread) {
1743                         struct snd_timer_tread tread;
1744                         memset(&tread, 0, sizeof(tread));
1745                         tread.event = SNDRV_TIMER_EVENT_EARLY;
1746                         tread.tstamp.tv_sec = 0;
1747                         tread.tstamp.tv_nsec = 0;
1748                         tread.val = 0;
1749                         snd_timer_user_append_to_tqueue(tu, &tread);
1750                 } else {
1751                         struct snd_timer_read *r = &tu->queue[0];
1752                         r->resolution = 0;
1753                         r->ticks = 0;
1754                         tu->qused++;
1755                         tu->qtail++;
1756                 }
1757         }
1758         tu->filter = params.filter;
1759         tu->ticks = params.ticks;
1760         err = 0;
1761  _end:
1762         if (copy_to_user(_params, &params, sizeof(params)))
1763                 return -EFAULT;
1764         return err;
1765 }
1766 
1767 static int snd_timer_user_status(struct file *file,
1768                                  struct snd_timer_status __user *_status)
1769 {
1770         struct snd_timer_user *tu;
1771         struct snd_timer_status status;
1772 
1773         tu = file->private_data;
1774         if (!tu->timeri)
1775                 return -EBADFD;
1776         memset(&status, 0, sizeof(status));
1777         status.tstamp = tu->tstamp;
1778         status.resolution = snd_timer_resolution(tu->timeri);
1779         status.lost = tu->timeri->lost;
1780         status.overrun = tu->overrun;
1781         spin_lock_irq(&tu->qlock);
1782         status.queue = tu->qused;
1783         spin_unlock_irq(&tu->qlock);
1784         if (copy_to_user(_status, &status, sizeof(status)))
1785                 return -EFAULT;
1786         return 0;
1787 }
1788 
1789 static int snd_timer_user_start(struct file *file)
1790 {
1791         int err;
1792         struct snd_timer_user *tu;
1793 
1794         tu = file->private_data;
1795         if (!tu->timeri)
1796                 return -EBADFD;
1797         snd_timer_stop(tu->timeri);
1798         tu->timeri->lost = 0;
1799         tu->last_resolution = 0;
1800         return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1801 }
1802 
1803 static int snd_timer_user_stop(struct file *file)
1804 {
1805         int err;
1806         struct snd_timer_user *tu;
1807 
1808         tu = file->private_data;
1809         if (!tu->timeri)
1810                 return -EBADFD;
1811         return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1812 }
1813 
1814 static int snd_timer_user_continue(struct file *file)
1815 {
1816         int err;
1817         struct snd_timer_user *tu;
1818 
1819         tu = file->private_data;
1820         if (!tu->timeri)
1821                 return -EBADFD;
1822         tu->timeri->lost = 0;
1823         return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1824 }
1825 
1826 static int snd_timer_user_pause(struct file *file)
1827 {
1828         int err;
1829         struct snd_timer_user *tu;
1830 
1831         tu = file->private_data;
1832         if (!tu->timeri)
1833                 return -EBADFD;
1834         return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1835 }
1836 
1837 enum {
1838         SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1839         SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1840         SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1841         SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1842 };
1843 
1844 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1845                                  unsigned long arg)
1846 {
1847         struct snd_timer_user *tu;
1848         void __user *argp = (void __user *)arg;
1849         int __user *p = argp;
1850 
1851         tu = file->private_data;
1852         switch (cmd) {
1853         case SNDRV_TIMER_IOCTL_PVERSION:
1854                 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1855         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1856                 return snd_timer_user_next_device(argp);
1857         case SNDRV_TIMER_IOCTL_TREAD:
1858         {
1859                 int xarg;
1860 
1861                 if (tu->timeri) /* too late */
1862                         return -EBUSY;
1863                 if (get_user(xarg, p))
1864                         return -EFAULT;
1865                 tu->tread = xarg ? 1 : 0;
1866                 return 0;
1867         }
1868         case SNDRV_TIMER_IOCTL_GINFO:
1869                 return snd_timer_user_ginfo(file, argp);
1870         case SNDRV_TIMER_IOCTL_GPARAMS:
1871                 return snd_timer_user_gparams(file, argp);
1872         case SNDRV_TIMER_IOCTL_GSTATUS:
1873                 return snd_timer_user_gstatus(file, argp);
1874         case SNDRV_TIMER_IOCTL_SELECT:
1875                 return snd_timer_user_tselect(file, argp);
1876         case SNDRV_TIMER_IOCTL_INFO:
1877                 return snd_timer_user_info(file, argp);
1878         case SNDRV_TIMER_IOCTL_PARAMS:
1879                 return snd_timer_user_params(file, argp);
1880         case SNDRV_TIMER_IOCTL_STATUS:
1881                 return snd_timer_user_status(file, argp);
1882         case SNDRV_TIMER_IOCTL_START:
1883         case SNDRV_TIMER_IOCTL_START_OLD:
1884                 return snd_timer_user_start(file);
1885         case SNDRV_TIMER_IOCTL_STOP:
1886         case SNDRV_TIMER_IOCTL_STOP_OLD:
1887                 return snd_timer_user_stop(file);
1888         case SNDRV_TIMER_IOCTL_CONTINUE:
1889         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1890                 return snd_timer_user_continue(file);
1891         case SNDRV_TIMER_IOCTL_PAUSE:
1892         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1893                 return snd_timer_user_pause(file);
1894         }
1895         return -ENOTTY;
1896 }
1897 
1898 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1899                                  unsigned long arg)
1900 {
1901         struct snd_timer_user *tu = file->private_data;
1902         long ret;
1903 
1904         mutex_lock(&tu->ioctl_lock);
1905         ret = __snd_timer_user_ioctl(file, cmd, arg);
1906         mutex_unlock(&tu->ioctl_lock);
1907         return ret;
1908 }
1909 
1910 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1911 {
1912         struct snd_timer_user *tu;
1913 
1914         tu = file->private_data;
1915         return fasync_helper(fd, file, on, &tu->fasync);
1916 }
1917 
1918 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1919                                    size_t count, loff_t *offset)
1920 {
1921         struct snd_timer_user *tu;
1922         long result = 0, unit;
1923         int qhead;
1924         int err = 0;
1925 
1926         tu = file->private_data;
1927         unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1928         spin_lock_irq(&tu->qlock);
1929         while ((long)count - result >= unit) {
1930                 while (!tu->qused) {
1931                         wait_queue_t wait;
1932 
1933                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1934                                 err = -EAGAIN;
1935                                 goto _error;
1936                         }
1937 
1938                         set_current_state(TASK_INTERRUPTIBLE);
1939                         init_waitqueue_entry(&wait, current);
1940                         add_wait_queue(&tu->qchange_sleep, &wait);
1941 
1942                         spin_unlock_irq(&tu->qlock);
1943                         schedule();
1944                         spin_lock_irq(&tu->qlock);
1945 
1946                         remove_wait_queue(&tu->qchange_sleep, &wait);
1947 
1948                         if (tu->disconnected) {
1949                                 err = -ENODEV;
1950                                 goto _error;
1951                         }
1952                         if (signal_pending(current)) {
1953                                 err = -ERESTARTSYS;
1954                                 goto _error;
1955                         }
1956                 }
1957 
1958                 qhead = tu->qhead++;
1959                 tu->qhead %= tu->queue_size;
1960                 tu->qused--;
1961                 spin_unlock_irq(&tu->qlock);
1962 
1963                 if (tu->tread) {
1964                         if (copy_to_user(buffer, &tu->tqueue[qhead],
1965                                          sizeof(struct snd_timer_tread)))
1966                                 err = -EFAULT;
1967                 } else {
1968                         if (copy_to_user(buffer, &tu->queue[qhead],
1969                                          sizeof(struct snd_timer_read)))
1970                                 err = -EFAULT;
1971                 }
1972 
1973                 spin_lock_irq(&tu->qlock);
1974                 if (err < 0)
1975                         goto _error;
1976                 result += unit;
1977                 buffer += unit;
1978         }
1979  _error:
1980         spin_unlock_irq(&tu->qlock);
1981         return result > 0 ? result : err;
1982 }
1983 
1984 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1985 {
1986         unsigned int mask;
1987         struct snd_timer_user *tu;
1988 
1989         tu = file->private_data;
1990 
1991         poll_wait(file, &tu->qchange_sleep, wait);
1992 
1993         mask = 0;
1994         if (tu->qused)
1995                 mask |= POLLIN | POLLRDNORM;
1996         if (tu->disconnected)
1997                 mask |= POLLERR;
1998 
1999         return mask;
2000 }
2001 
2002 #ifdef CONFIG_COMPAT
2003 #include "timer_compat.c"
2004 #else
2005 #define snd_timer_user_ioctl_compat     NULL
2006 #endif
2007 
2008 static const struct file_operations snd_timer_f_ops =
2009 {
2010         .owner =        THIS_MODULE,
2011         .read =         snd_timer_user_read,
2012         .open =         snd_timer_user_open,
2013         .release =      snd_timer_user_release,
2014         .llseek =       no_llseek,
2015         .poll =         snd_timer_user_poll,
2016         .unlocked_ioctl =       snd_timer_user_ioctl,
2017         .compat_ioctl = snd_timer_user_ioctl_compat,
2018         .fasync =       snd_timer_user_fasync,
2019 };
2020 
2021 /* unregister the system timer */
2022 static void snd_timer_free_all(void)
2023 {
2024         struct snd_timer *timer, *n;
2025 
2026         list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2027                 snd_timer_free(timer);
2028 }
2029 
2030 static struct device timer_dev;
2031 
2032 /*
2033  *  ENTRY functions
2034  */
2035 
2036 static int __init alsa_timer_init(void)
2037 {
2038         int err;
2039 
2040         snd_device_initialize(&timer_dev, NULL);
2041         dev_set_name(&timer_dev, "timer");
2042 
2043 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2044         snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2045                               "system timer");
2046 #endif
2047 
2048         err = snd_timer_register_system();
2049         if (err < 0) {
2050                 pr_err("ALSA: unable to register system timer (%i)\n", err);
2051                 put_device(&timer_dev);
2052                 return err;
2053         }
2054 
2055         err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2056                                   &snd_timer_f_ops, NULL, &timer_dev);
2057         if (err < 0) {
2058                 pr_err("ALSA: unable to register timer device (%i)\n", err);
2059                 snd_timer_free_all();
2060                 put_device(&timer_dev);
2061                 return err;
2062         }
2063 
2064         snd_timer_proc_init();
2065         return 0;
2066 }
2067 
2068 static void __exit alsa_timer_exit(void)
2069 {
2070         snd_unregister_device(&timer_dev);
2071         snd_timer_free_all();
2072         put_device(&timer_dev);
2073         snd_timer_proc_done();
2074 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2075         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2076 #endif
2077 }
2078 
2079 module_init(alsa_timer_init)
2080 module_exit(alsa_timer_exit)
2081 
2082 EXPORT_SYMBOL(snd_timer_open);
2083 EXPORT_SYMBOL(snd_timer_close);
2084 EXPORT_SYMBOL(snd_timer_resolution);
2085 EXPORT_SYMBOL(snd_timer_start);
2086 EXPORT_SYMBOL(snd_timer_stop);
2087 EXPORT_SYMBOL(snd_timer_continue);
2088 EXPORT_SYMBOL(snd_timer_pause);
2089 EXPORT_SYMBOL(snd_timer_new);
2090 EXPORT_SYMBOL(snd_timer_notify);
2091 EXPORT_SYMBOL(snd_timer_global_new);
2092 EXPORT_SYMBOL(snd_timer_global_free);
2093 EXPORT_SYMBOL(snd_timer_global_register);
2094 EXPORT_SYMBOL(snd_timer_interrupt);
2095 

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