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[ALSA] timer: fix timer instance memory allocation checks
[deliverable/linux.git] / sound / core / timer.c
CommitLineData
1da177e4
LT		 1/*
2 * Timers abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <sound/driver.h>
23#include <linux/delay.h>
24#include <linux/init.h>
25#include <linux/smp_lock.h>
26#include <linux/slab.h>
27#include <linux/time.h>
28#include <linux/moduleparam.h>
543537bd 29#include <linux/string.h>
1da177e4
LT		 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#ifdef CONFIG_KERNELD
38#include <linux/kerneld.h>
39#endif
40
41#if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
42#define DEFAULT_TIMER_LIMIT 3
43#elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
44#define DEFAULT_TIMER_LIMIT 2
45#else
46#define DEFAULT_TIMER_LIMIT 1
47#endif
48
49static int timer_limit = DEFAULT_TIMER_LIMIT;
50MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>");
51MODULE_DESCRIPTION("ALSA timer interface");
52MODULE_LICENSE("GPL");
53module_param(timer_limit, int, 0444);
54MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
55
56typedef struct {
57 snd_timer_instance_t *timeri;
58 int tread; /* enhanced read with timestamps and events */
59 unsigned long ticks;
60 unsigned long overrun;
61 int qhead;
62 int qtail;
63 int qused;
64 int queue_size;
65 snd_timer_read_t *queue;
66 snd_timer_tread_t *tqueue;
67 spinlock_t qlock;
68 unsigned long last_resolution;
69 unsigned int filter;
70 struct timespec tstamp; /* trigger tstamp */
71 wait_queue_head_t qchange_sleep;
72 struct fasync_struct *fasync;
c1935b4d 73 struct semaphore tread_sem;
1da177e4
LT		 74} snd_timer_user_t;
75
76/* list of timers */
77static LIST_HEAD(snd_timer_list);
78
79/* list of slave instances */
80static LIST_HEAD(snd_timer_slave_list);
81
82/* lock for slave active lists */
83static DEFINE_SPINLOCK(slave_active_lock);
84
85static DECLARE_MUTEX(register_mutex);
86
87static int snd_timer_free(snd_timer_t *timer);
88static int snd_timer_dev_free(snd_device_t *device);
89static int snd_timer_dev_register(snd_device_t *device);
90static int snd_timer_dev_unregister(snd_device_t *device);
91
92static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left);
93
94/*
95 * create a timer instance with the given owner string.
96 * when timer is not NULL, increments the module counter
97 */
98static snd_timer_instance_t *snd_timer_instance_new(char *owner, snd_timer_t *timer)
99{
100 snd_timer_instance_t *timeri;
ca2c0966 101 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
1da177e4
LT		 102 if (timeri == NULL)
103 return NULL;
543537bd 104 timeri->owner = kstrdup(owner, GFP_KERNEL);
1da177e4
LT		 105 if (! timeri->owner) {
106 kfree(timeri);
107 return NULL;
108 }
109 INIT_LIST_HEAD(&timeri->open_list);
110 INIT_LIST_HEAD(&timeri->active_list);
111 INIT_LIST_HEAD(&timeri->ack_list);
112 INIT_LIST_HEAD(&timeri->slave_list_head);
113 INIT_LIST_HEAD(&timeri->slave_active_head);
114
115 timeri->timer = timer;
116 if (timer && timer->card && !try_module_get(timer->card->module)) {
117 kfree(timeri->owner);
118 kfree(timeri);
119 return NULL;
120 }
121
122 return timeri;
123}
124
125/*
126 * find a timer instance from the given timer id
127 */
128static snd_timer_t *snd_timer_find(snd_timer_id_t *tid)
129{
130 snd_timer_t *timer = NULL;
131 struct list_head *p;
132
133 list_for_each(p, &snd_timer_list) {
134 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
135
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_KMOD
153
154static void snd_timer_request(snd_timer_id_t *tid)
155{
156 if (! current->fs->root)
157 return;
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 */
181static void snd_timer_check_slave(snd_timer_instance_t *slave)
182{
183 snd_timer_t *timer;
184 snd_timer_instance_t *master;
185 struct list_head *p, *q;
186
187 /* FIXME: it's really dumb to look up all entries.. */
188 list_for_each(p, &snd_timer_list) {
189 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
190 list_for_each(q, &timer->open_list_head) {
191 master = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list);
192 if (slave->slave_class == master->slave_class &&
193 slave->slave_id == master->slave_id) {
194 list_del(&slave->open_list);
195 list_add_tail(&slave->open_list, &master->slave_list_head);
196 spin_lock_irq(&slave_active_lock);
197 slave->master = master;
198 slave->timer = master->timer;
199 spin_unlock_irq(&slave_active_lock);
200 return;
201 }
202 }
203 }
204}
205
206/*
207 * look for slave instances matching with the slave id of the given master.
208 * when found, relink the open_link of slaves.
209 *
210 * call this with register_mutex down.
211 */
212static void snd_timer_check_master(snd_timer_instance_t *master)
213{
214 snd_timer_instance_t *slave;
215 struct list_head *p, *n;
216
217 /* check all pending slaves */
218 list_for_each_safe(p, n, &snd_timer_slave_list) {
219 slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
220 if (slave->slave_class == master->slave_class &&
221 slave->slave_id == master->slave_id) {
222 list_del(p);
223 list_add_tail(p, &master->slave_list_head);
224 spin_lock_irq(&slave_active_lock);
225 slave->master = master;
226 slave->timer = master->timer;
227 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
228 list_add_tail(&slave->active_list, &master->slave_active_head);
229 spin_unlock_irq(&slave_active_lock);
230 }
231 }
232}
233
234/*
235 * open a timer instance
236 * when opening a master, the slave id must be here given.
237 */
238int snd_timer_open(snd_timer_instance_t **ti,
239 char *owner, snd_timer_id_t *tid,
240 unsigned int slave_id)
241{
242 snd_timer_t *timer;
243 snd_timer_instance_t *timeri = NULL;
244
245 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
246 /* open a slave instance */
247 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
248 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
249 snd_printd("invalid slave class %i\n", tid->dev_sclass);
250 return -EINVAL;
251 }
252 down(&register_mutex);
253 timeri = snd_timer_instance_new(owner, NULL);
2fd43d11
CL		 254 if (!timeri) {
255 up(&register_mutex);
256 return -ENOMEM;
257 }
1da177e4
LT		 258 timeri->slave_class = tid->dev_sclass;
259 timeri->slave_id = tid->device;
260 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
261 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
262 snd_timer_check_slave(timeri);
263 up(&register_mutex);
264 *ti = timeri;
265 return 0;
266 }
267
268 /* open a master instance */
269 down(&register_mutex);
270 timer = snd_timer_find(tid);
271#ifdef CONFIG_KMOD
272 if (timer == NULL) {
273 up(&register_mutex);
274 snd_timer_request(tid);
275 down(&register_mutex);
276 timer = snd_timer_find(tid);
277 }
278#endif
2fd43d11 279 if (!timer) {
1da177e4
LT		 280 up(&register_mutex);
281 return -ENODEV;
282 }
2fd43d11
CL		 283 if (!list_empty(&timer->open_list_head)) {
284 timeri = list_entry(timer->open_list_head.next,
285 snd_timer_instance_t, open_list);
286 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
287 up(&register_mutex);
288 return -EBUSY;
289 }
290 }
291 timeri = snd_timer_instance_new(owner, timer);
292 if (!timeri) {
293 up(&register_mutex);
294 return -ENOMEM;
295 }
296 timeri->slave_class = tid->dev_sclass;
297 timeri->slave_id = slave_id;
298 if (list_empty(&timer->open_list_head) && timer->hw.open)
299 timer->hw.open(timer);
300 list_add_tail(&timeri->open_list, &timer->open_list_head);
301 snd_timer_check_master(timeri);
1da177e4
LT		 302 up(&register_mutex);
303 *ti = timeri;
304 return 0;
305}
306
307static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event);
308
309/*
310 * close a timer instance
311 */
312int snd_timer_close(snd_timer_instance_t * timeri)
313{
314 snd_timer_t *timer = NULL;
315 struct list_head *p, *n;
316 snd_timer_instance_t *slave;
317
318 snd_assert(timeri != NULL, return -ENXIO);
319
320 /* force to stop the timer */
321 snd_timer_stop(timeri);
322
323 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
324 /* wait, until the active callback is finished */
325 spin_lock_irq(&slave_active_lock);
326 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
327 spin_unlock_irq(&slave_active_lock);
328 udelay(10);
329 spin_lock_irq(&slave_active_lock);
330 }
331 spin_unlock_irq(&slave_active_lock);
332 down(&register_mutex);
333 list_del(&timeri->open_list);
334 up(&register_mutex);
335 } else {
336 timer = timeri->timer;
337 /* wait, until the active callback is finished */
338 spin_lock_irq(&timer->lock);
339 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
340 spin_unlock_irq(&timer->lock);
341 udelay(10);
342 spin_lock_irq(&timer->lock);
343 }
344 spin_unlock_irq(&timer->lock);
345 down(&register_mutex);
346 list_del(&timeri->open_list);
347 if (timer && list_empty(&timer->open_list_head) && timer->hw.close)
348 timer->hw.close(timer);
349 /* remove slave links */
350 list_for_each_safe(p, n, &timeri->slave_list_head) {
351 slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
352 spin_lock_irq(&slave_active_lock);
353 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
354 list_del(p);
355 list_add_tail(p, &snd_timer_slave_list);
356 slave->master = NULL;
357 slave->timer = NULL;
358 spin_unlock_irq(&slave_active_lock);
359 }
360 up(&register_mutex);
361 }
362 if (timeri->private_free)
363 timeri->private_free(timeri);
364 kfree(timeri->owner);
365 kfree(timeri);
366 if (timer && timer->card)
367 module_put(timer->card->module);
368 return 0;
369}
370
371unsigned long snd_timer_resolution(snd_timer_instance_t * timeri)
372{
373 snd_timer_t * timer;
374
375 if (timeri == NULL)
376 return 0;
377 if ((timer = timeri->timer) != NULL) {
378 if (timer->hw.c_resolution)
379 return timer->hw.c_resolution(timer);
380 return timer->hw.resolution;
381 }
382 return 0;
383}
384
385static void snd_timer_notify1(snd_timer_instance_t *ti, enum sndrv_timer_event event)
386{
387 snd_timer_t *timer;
388 unsigned long flags;
389 unsigned long resolution = 0;
390 snd_timer_instance_t *ts;
391 struct list_head *n;
392 struct timespec tstamp;
393
07799e75 394 getnstimeofday(&tstamp);
1da177e4
LT		 395 snd_assert(event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE, return);
396 if (event == SNDRV_TIMER_EVENT_START || event == SNDRV_TIMER_EVENT_CONTINUE)
397 resolution = snd_timer_resolution(ti);
398 if (ti->ccallback)
399 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution);
400 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
401 return;
402 timer = ti->timer;
403 if (timer == NULL)
404 return;
405 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
406 return;
407 spin_lock_irqsave(&timer->lock, flags);
408 list_for_each(n, &ti->slave_active_head) {
409 ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
410 if (ts->ccallback)
411 ts->ccallback(ti, event + 100, &tstamp, resolution);
412 }
413 spin_unlock_irqrestore(&timer->lock, flags);
414}
415
416static int snd_timer_start1(snd_timer_t *timer, snd_timer_instance_t *timeri, unsigned long sticks)
417{
418 list_del(&timeri->active_list);
419 list_add_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(snd_timer_instance_t *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, &timeri->master->slave_active_head);
444 spin_unlock_irqrestore(&slave_active_lock, flags);
445 return 1; /* delayed start */
446}
447
448/*
449 * start the timer instance
450 */
451int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks)
452{
453 snd_timer_t *timer;
454 int result = -EINVAL;
455 unsigned long flags;
456
457 if (timeri == NULL || ticks < 1)
458 return -EINVAL;
459 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
460 result = snd_timer_start_slave(timeri);
461 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
462 return result;
463 }
464 timer = timeri->timer;
465 if (timer == NULL)
466 return -EINVAL;
467 spin_lock_irqsave(&timer->lock, flags);
468 timeri->ticks = timeri->cticks = ticks;
469 timeri->pticks = 0;
470 result = snd_timer_start1(timer, timeri, ticks);
471 spin_unlock_irqrestore(&timer->lock, flags);
472 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
473 return result;
474}
475
476static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event)
477{
478 snd_timer_t *timer;
479 unsigned long flags;
480
481 snd_assert(timeri != NULL, return -ENXIO);
482
483 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
484 if (!keep_flag) {
485 spin_lock_irqsave(&slave_active_lock, flags);
486 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
487 spin_unlock_irqrestore(&slave_active_lock, flags);
488 }
489 goto __end;
490 }
491 timer = timeri->timer;
492 if (!timer)
493 return -EINVAL;
494 spin_lock_irqsave(&timer->lock, flags);
495 list_del_init(&timeri->ack_list);
496 list_del_init(&timeri->active_list);
497 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
498 !(--timer->running)) {
499 timer->hw.stop(timer);
500 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
501 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
502 snd_timer_reschedule(timer, 0);
503 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
504 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
505 timer->hw.start(timer);
506 }
507 }
508 }
509 if (!keep_flag)
510 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING|SNDRV_TIMER_IFLG_START);
511 spin_unlock_irqrestore(&timer->lock, flags);
512 __end:
513 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
514 snd_timer_notify1(timeri, event);
515 return 0;
516}
517
518/*
519 * stop the timer instance.
520 *
521 * do not call this from the timer callback!
522 */
523int snd_timer_stop(snd_timer_instance_t * timeri)
524{
525 snd_timer_t *timer;
526 unsigned long flags;
527 int err;
528
529 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
530 if (err < 0)
531 return err;
532 timer = timeri->timer;
533 spin_lock_irqsave(&timer->lock, flags);
534 timeri->cticks = timeri->ticks;
535 timeri->pticks = 0;
536 spin_unlock_irqrestore(&timer->lock, flags);
537 return 0;
538}
539
540/*
541 * start again.. the tick is kept.
542 */
543int snd_timer_continue(snd_timer_instance_t * timeri)
544{
545 snd_timer_t *timer;
546 int result = -EINVAL;
547 unsigned long flags;
548
549 if (timeri == NULL)
550 return result;
551 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
552 return snd_timer_start_slave(timeri);
553 timer = timeri->timer;
554 if (! timer)
555 return -EINVAL;
556 spin_lock_irqsave(&timer->lock, flags);
557 if (!timeri->cticks)
558 timeri->cticks = 1;
559 timeri->pticks = 0;
560 result = snd_timer_start1(timer, timeri, timer->sticks);
561 spin_unlock_irqrestore(&timer->lock, flags);
562 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
563 return result;
564}
565
566/*
567 * pause.. remember the ticks left
568 */
569int snd_timer_pause(snd_timer_instance_t * timeri)
570{
571 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
572}
573
574/*
575 * reschedule the timer
576 *
577 * start pending instances and check the scheduling ticks.
578 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
579 */
580static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left)
581{
582 snd_timer_instance_t *ti;
583 unsigned long ticks = ~0UL;
584 struct list_head *p;
585
586 list_for_each(p, &timer->active_list_head) {
587 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
588 if (ti->flags & SNDRV_TIMER_IFLG_START) {
589 ti->flags &= ~SNDRV_TIMER_IFLG_START;
590 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
591 timer->running++;
592 }
593 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
594 if (ticks > ti->cticks)
595 ticks = ti->cticks;
596 }
597 }
598 if (ticks == ~0UL) {
599 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
600 return;
601 }
602 if (ticks > timer->hw.ticks)
603 ticks = timer->hw.ticks;
604 if (ticks_left != ticks)
605 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
606 timer->sticks = ticks;
607}
608
609/*
610 * timer tasklet
611 *
612 */
613static void snd_timer_tasklet(unsigned long arg)
614{
615 snd_timer_t *timer = (snd_timer_t *) arg;
616 snd_timer_instance_t *ti;
617 struct list_head *p;
618 unsigned long resolution, ticks;
619
620 spin_lock(&timer->lock);
621 /* now process all callbacks */
622 while (!list_empty(&timer->sack_list_head)) {
623 p = timer->sack_list_head.next; /* get first item */
624 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
625
626 /* remove from ack_list and make empty */
627 list_del_init(p);
628
629 ticks = ti->pticks;
630 ti->pticks = 0;
631 resolution = ti->resolution;
632
633 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
634 spin_unlock(&timer->lock);
635 if (ti->callback)
636 ti->callback(ti, resolution, ticks);
637 spin_lock(&timer->lock);
638 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
639 }
640 spin_unlock(&timer->lock);
641}
642
643/*
644 * timer interrupt
645 *
646 * ticks_left is usually equal to timer->sticks.
647 *
648 */
649void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left)
650{
651 snd_timer_instance_t *ti, *ts;
652 unsigned long resolution, ticks;
653 struct list_head *p, *q, *n;
654 int use_tasklet = 0;
655
656 if (timer == NULL)
657 return;
658
659 spin_lock(&timer->lock);
660
661 /* remember the current resolution */
662 if (timer->hw.c_resolution)
663 resolution = timer->hw.c_resolution(timer);
664 else
665 resolution = timer->hw.resolution;
666
667 /* loop for all active instances
668 * here we cannot use list_for_each because the active_list of a processed
669 * instance is relinked to done_list_head before callback is called.
670 */
671 list_for_each_safe(p, n, &timer->active_list_head) {
672 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
673 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
674 continue;
675 ti->pticks += ticks_left;
676 ti->resolution = resolution;
677 if (ti->cticks < ticks_left)
678 ti->cticks = 0;
679 else
680 ti->cticks -= ticks_left;
681 if (ti->cticks) /* not expired */
682 continue;
683 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
684 ti->cticks = ti->ticks;
685 } else {
686 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
687 if (--timer->running)
688 list_del(p);
689 }
690 if (list_empty(&ti->ack_list)) {
691 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
692 (ti->flags & SNDRV_TIMER_IFLG_FAST)) {
693 list_add_tail(&ti->ack_list, &timer->ack_list_head);
694 } else {
695 list_add_tail(&ti->ack_list, &timer->sack_list_head);
696 }
697 }
698 list_for_each(q, &ti->slave_active_head) {
699 ts = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, active_list);
700 ts->pticks = ti->pticks;
701 ts->resolution = resolution;
702 if (list_empty(&ts->ack_list)) {
703 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
704 (ti->flags & SNDRV_TIMER_IFLG_FAST)) {
705 list_add_tail(&ts->ack_list, &timer->ack_list_head);
706 } else {
707 list_add_tail(&ts->ack_list, &timer->sack_list_head);
708 }
709 }
710 }
711 }
712 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
713 snd_timer_reschedule(timer, ticks_left);
714 if (timer->running) {
715 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
716 timer->hw.stop(timer);
717 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
718 }
719 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
720 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
721 /* restart timer */
722 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
723 timer->hw.start(timer);
724 }
725 } else {
726 timer->hw.stop(timer);
727 }
728
729 /* now process all fast callbacks */
730 while (!list_empty(&timer->ack_list_head)) {
731 p = timer->ack_list_head.next; /* get first item */
732 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list);
733
734 /* remove from ack_list and make empty */
735 list_del_init(p);
736
737 ticks = ti->pticks;
738 ti->pticks = 0;
739
740 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
741 spin_unlock(&timer->lock);
742 if (ti->callback)
743 ti->callback(ti, resolution, ticks);
744 spin_lock(&timer->lock);
745 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
746 }
747
748 /* do we have any slow callbacks? */
749 use_tasklet = !list_empty(&timer->sack_list_head);
750 spin_unlock(&timer->lock);
751
752 if (use_tasklet)
753 tasklet_hi_schedule(&timer->task_queue);
754}
755
756/*
757
758 */
759
760int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t ** rtimer)
761{
762 snd_timer_t *timer;
763 int err;
764 static snd_device_ops_t ops = {
765 .dev_free = snd_timer_dev_free,
766 .dev_register = snd_timer_dev_register,
767 .dev_unregister = snd_timer_dev_unregister
768 };
769
770 snd_assert(tid != NULL, return -EINVAL);
771 snd_assert(rtimer != NULL, return -EINVAL);
772 *rtimer = NULL;
ca2c0966 773 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
1da177e4
LT		 774 if (timer == NULL)
775 return -ENOMEM;
776 timer->tmr_class = tid->dev_class;
777 timer->card = card;
778 timer->tmr_device = tid->device;
779 timer->tmr_subdevice = tid->subdevice;
780 if (id)
781 strlcpy(timer->id, id, sizeof(timer->id));
782 INIT_LIST_HEAD(&timer->device_list);
783 INIT_LIST_HEAD(&timer->open_list_head);
784 INIT_LIST_HEAD(&timer->active_list_head);
785 INIT_LIST_HEAD(&timer->ack_list_head);
786 INIT_LIST_HEAD(&timer->sack_list_head);
787 spin_lock_init(&timer->lock);
788 tasklet_init(&timer->task_queue, snd_timer_tasklet, (unsigned long)timer);
789 if (card != NULL) {
790 if ((err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops)) < 0) {
791 snd_timer_free(timer);
792 return err;
793 }
794 }
795 *rtimer = timer;
796 return 0;
797}
798
799static int snd_timer_free(snd_timer_t *timer)
800{
801 snd_assert(timer != NULL, return -ENXIO);
802 if (timer->private_free)
803 timer->private_free(timer);
804 kfree(timer);
805 return 0;
806}
807
a53fc188 808static int snd_timer_dev_free(snd_device_t *device)
1da177e4
LT		 809{
810 snd_timer_t *timer = device->device_data;
811 return snd_timer_free(timer);
812}
813
a53fc188 814static int snd_timer_dev_register(snd_device_t *dev)
1da177e4
LT		 815{
816 snd_timer_t *timer = dev->device_data;
817 snd_timer_t *timer1;
818 struct list_head *p;
819
820 snd_assert(timer != NULL && timer->hw.start != NULL && timer->hw.stop != NULL, return -ENXIO);
821 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
822 !timer->hw.resolution && timer->hw.c_resolution == NULL)
823 return -EINVAL;
824
825 down(&register_mutex);
826 list_for_each(p, &snd_timer_list) {
827 timer1 = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
828 if (timer1->tmr_class > timer->tmr_class)
829 break;
830 if (timer1->tmr_class < timer->tmr_class)
831 continue;
832 if (timer1->card && timer->card) {
833 if (timer1->card->number > timer->card->number)
834 break;
835 if (timer1->card->number < timer->card->number)
836 continue;
837 }
838 if (timer1->tmr_device > timer->tmr_device)
839 break;
840 if (timer1->tmr_device < timer->tmr_device)
841 continue;
842 if (timer1->tmr_subdevice > timer->tmr_subdevice)
843 break;
844 if (timer1->tmr_subdevice < timer->tmr_subdevice)
845 continue;
846 /* conflicts.. */
847 up(&register_mutex);
848 return -EBUSY;
849 }
850 list_add_tail(&timer->device_list, p);
851 up(&register_mutex);
852 return 0;
853}
854
123992f7 855static int snd_timer_unregister(snd_timer_t *timer)
1da177e4
LT		 856{
857 struct list_head *p, *n;
858 snd_timer_instance_t *ti;
859
860 snd_assert(timer != NULL, return -ENXIO);
861 down(&register_mutex);
862 if (! list_empty(&timer->open_list_head)) {
863 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer);
864 list_for_each_safe(p, n, &timer->open_list_head) {
865 list_del_init(p);
866 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list);
867 ti->timer = NULL;
868 }
869 }
870 list_del(&timer->device_list);
871 up(&register_mutex);
872 return snd_timer_free(timer);
873}
874
875static int snd_timer_dev_unregister(snd_device_t *device)
876{
877 snd_timer_t *timer = device->device_data;
878 return snd_timer_unregister(timer);
879}
880
881void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, struct timespec *tstamp)
882{
883 unsigned long flags;
884 unsigned long resolution = 0;
885 snd_timer_instance_t *ti, *ts;
886 struct list_head *p, *n;
887
7c22f1aa
TI		 888 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
889 return;
a501dfa3 890 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && event <= SNDRV_TIMER_EVENT_MRESUME, return);
1da177e4 891 spin_lock_irqsave(&timer->lock, flags);
a501dfa3
JK		 892 if (event == SNDRV_TIMER_EVENT_MSTART ||
893 event == SNDRV_TIMER_EVENT_MCONTINUE ||
894 event == SNDRV_TIMER_EVENT_MRESUME) {
1da177e4
LT		 895 if (timer->hw.c_resolution)
896 resolution = timer->hw.c_resolution(timer);
897 else
898 resolution = timer->hw.resolution;
899 }
900 list_for_each(p, &timer->active_list_head) {
901 ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list);
902 if (ti->ccallback)
903 ti->ccallback(ti, event, tstamp, resolution);
904 list_for_each(n, &ti->slave_active_head) {
905 ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list);
906 if (ts->ccallback)
907 ts->ccallback(ts, event, tstamp, resolution);
908 }
909 }
910 spin_unlock_irqrestore(&timer->lock, flags);
911}
912
913/*
914 * exported functions for global timers
915 */
916int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer)
917{
918 snd_timer_id_t tid;
919
920 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
921 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
922 tid.card = -1;
923 tid.device = device;
924 tid.subdevice = 0;
925 return snd_timer_new(NULL, id, &tid, rtimer);
926}
927
928int snd_timer_global_free(snd_timer_t *timer)
929{
930 return snd_timer_free(timer);
931}
932
933int snd_timer_global_register(snd_timer_t *timer)
934{
935 snd_device_t dev;
936
937 memset(&dev, 0, sizeof(dev));
938 dev.device_data = timer;
939 return snd_timer_dev_register(&dev);
940}
941
942int snd_timer_global_unregister(snd_timer_t *timer)
943{
944 return snd_timer_unregister(timer);
945}
946
947/*
948 * System timer
949 */
950
951struct snd_timer_system_private {
952 struct timer_list tlist;
953 struct timer * timer;
954 unsigned long last_expires;
955 unsigned long last_jiffies;
956 unsigned long correction;
957};
958
1da177e4
LT		 959static void snd_timer_s_function(unsigned long data)
960{
961 snd_timer_t *timer = (snd_timer_t *)data;
962 struct snd_timer_system_private *priv = timer->private_data;
963 unsigned long jiff = jiffies;
964 if (time_after(jiff, priv->last_expires))
965 priv->correction = (long)jiff - (long)priv->last_expires;
966 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
967}
968
969static int snd_timer_s_start(snd_timer_t * timer)
970{
971 struct snd_timer_system_private *priv;
972 unsigned long njiff;
973
974 priv = (struct snd_timer_system_private *) timer->private_data;
975 njiff = (priv->last_jiffies = jiffies);
976 if (priv->correction > timer->sticks - 1) {
977 priv->correction -= timer->sticks - 1;
978 njiff++;
979 } else {
980 njiff += timer->sticks - priv->correction;
981 priv->correction -= timer->sticks;
982 }
983 priv->last_expires = priv->tlist.expires = njiff;
984 add_timer(&priv->tlist);
985 return 0;
986}
987
988static int snd_timer_s_stop(snd_timer_t * timer)
989{
990 struct snd_timer_system_private *priv;
991 unsigned long jiff;
992
993 priv = (struct snd_timer_system_private *) timer->private_data;
994 del_timer(&priv->tlist);
995 jiff = jiffies;
996 if (time_before(jiff, priv->last_expires))
997 timer->sticks = priv->last_expires - jiff;
998 else
999 timer->sticks = 1;
1000 return 0;
1001}
1002
1003static struct _snd_timer_hardware snd_timer_system =
1004{
1005 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1006 .resolution = 1000000000L / HZ,
1007 .ticks = 10000000L,
1008 .start = snd_timer_s_start,
1009 .stop = snd_timer_s_stop
1010};
1011
1012static void snd_timer_free_system(snd_timer_t *timer)
1013{
1014 kfree(timer->private_data);
1015}
1016
1017static int snd_timer_register_system(void)
1018{
1019 snd_timer_t *timer;
1020 struct snd_timer_system_private *priv;
1021 int err;
1022
1023 if ((err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer)) < 0)
1024 return err;
1025 strcpy(timer->name, "system timer");
1026 timer->hw = snd_timer_system;
ca2c0966 1027 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1da177e4
LT		 1028 if (priv == NULL) {
1029 snd_timer_free(timer);
1030 return -ENOMEM;
1031 }
1032 init_timer(&priv->tlist);
1033 priv->tlist.function = snd_timer_s_function;
1034 priv->tlist.data = (unsigned long) timer;
1035 timer->private_data = priv;
1036 timer->private_free = snd_timer_free_system;
1037 return snd_timer_global_register(timer);
1038}
1039
1040/*
1041 * Info interface
1042 */
1043
1044static void snd_timer_proc_read(snd_info_entry_t *entry,
1045 snd_info_buffer_t * buffer)
1046{
1047 unsigned long flags;
1048 snd_timer_t *timer;
1049 snd_timer_instance_t *ti;
1050 struct list_head *p, *q;
1051
1052 down(&register_mutex);
1053 list_for_each(p, &snd_timer_list) {
1054 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1055 switch (timer->tmr_class) {
1056 case SNDRV_TIMER_CLASS_GLOBAL:
1057 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1058 break;
1059 case SNDRV_TIMER_CLASS_CARD:
1060 snd_iprintf(buffer, "C%i-%i: ", timer->card->number, timer->tmr_device);
1061 break;
1062 case SNDRV_TIMER_CLASS_PCM:
1063 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, timer->tmr_device, timer->tmr_subdevice);
1064 break;
1065 default:
1066 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, timer->card ? timer->card->number : -1, timer->tmr_device, timer->tmr_subdevice);
1067 }
1068 snd_iprintf(buffer, "%s :", timer->name);
1069 if (timer->hw.resolution)
1070 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", timer->hw.resolution / 1000, timer->hw.resolution % 1000, timer->hw.ticks);
1071 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1072 snd_iprintf(buffer, " SLAVE");
1073 snd_iprintf(buffer, "\n");
1074 spin_lock_irqsave(&timer->lock, flags);
1075 list_for_each(q, &timer->open_list_head) {
1076 ti = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list);
1077 snd_iprintf(buffer, " Client %s : %s : lost interrupts %li\n",
1078 ti->owner ? ti->owner : "unknown",
1079 ti->flags & (SNDRV_TIMER_IFLG_START|SNDRV_TIMER_IFLG_RUNNING) ? "running" : "stopped",
1080 ti->lost);
1081 }
1082 spin_unlock_irqrestore(&timer->lock, flags);
1083 }
1084 up(&register_mutex);
1085}
1086
1087/*
1088 * USER SPACE interface
1089 */
1090
1091static void snd_timer_user_interrupt(snd_timer_instance_t *timeri,
1092 unsigned long resolution,
1093 unsigned long ticks)
1094{
1095 snd_timer_user_t *tu = timeri->callback_data;
1096 snd_timer_read_t *r;
1097 int prev;
1098
1099 spin_lock(&tu->qlock);
1100 if (tu->qused > 0) {
1101 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1102 r = &tu->queue[prev];
1103 if (r->resolution == resolution) {
1104 r->ticks += ticks;
1105 goto __wake;
1106 }
1107 }
1108 if (tu->qused >= tu->queue_size) {
1109 tu->overrun++;
1110 } else {
1111 r = &tu->queue[tu->qtail++];
1112 tu->qtail %= tu->queue_size;
1113 r->resolution = resolution;
1114 r->ticks = ticks;
1115 tu->qused++;
1116 }
1117 __wake:
1118 spin_unlock(&tu->qlock);
1119 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1120 wake_up(&tu->qchange_sleep);
1121}
1122
1123static void snd_timer_user_append_to_tqueue(snd_timer_user_t *tu, snd_timer_tread_t *tread)
1124{
1125 if (tu->qused >= tu->queue_size) {
1126 tu->overrun++;
1127 } else {
1128 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1129 tu->qtail %= tu->queue_size;
1130 tu->qused++;
1131 }
1132}
1133
1134static void snd_timer_user_ccallback(snd_timer_instance_t *timeri,
1135 enum sndrv_timer_event event,
1136 struct timespec *tstamp,
1137 unsigned long resolution)
1138{
1139 snd_timer_user_t *tu = timeri->callback_data;
1140 snd_timer_tread_t r1;
1141
1142 if (event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE)
1143 tu->tstamp = *tstamp;
1144 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1145 return;
1146 r1.event = event;
1147 r1.tstamp = *tstamp;
1148 r1.val = resolution;
1149 spin_lock(&tu->qlock);
1150 snd_timer_user_append_to_tqueue(tu, &r1);
1151 spin_unlock(&tu->qlock);
1152 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1153 wake_up(&tu->qchange_sleep);
1154}
1155
1156static void snd_timer_user_tinterrupt(snd_timer_instance_t *timeri,
1157 unsigned long resolution,
1158 unsigned long ticks)
1159{
1160 snd_timer_user_t *tu = timeri->callback_data;
1161 snd_timer_tread_t *r, r1;
1162 struct timespec tstamp;
1163 int prev, append = 0;
1164
07799e75 1165 memset(&tstamp, 0, sizeof(tstamp));
1da177e4
LT		 1166 spin_lock(&tu->qlock);
1167 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION)|(1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1168 spin_unlock(&tu->qlock);
1169 return;
1170 }
1171 if (tu->last_resolution != resolution || ticks > 0)
07799e75 1172 getnstimeofday(&tstamp);
1da177e4
LT		 1173 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && tu->last_resolution != resolution) {
1174 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1175 r1.tstamp = tstamp;
1176 r1.val = resolution;
1177 snd_timer_user_append_to_tqueue(tu, &r1);
1178 tu->last_resolution = resolution;
1179 append++;
1180 }
1181 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1182 goto __wake;
1183 if (ticks == 0)
1184 goto __wake;
1185 if (tu->qused > 0) {
1186 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1187 r = &tu->tqueue[prev];
1188 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1189 r->tstamp = tstamp;
1190 r->val += ticks;
1191 append++;
1192 goto __wake;
1193 }
1194 }
1195 r1.event = SNDRV_TIMER_EVENT_TICK;
1196 r1.tstamp = tstamp;
1197 r1.val = ticks;
1198 snd_timer_user_append_to_tqueue(tu, &r1);
1199 append++;
1200 __wake:
1201 spin_unlock(&tu->qlock);
1202 if (append == 0)
1203 return;
1204 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1205 wake_up(&tu->qchange_sleep);
1206}
1207
1208static int snd_timer_user_open(struct inode *inode, struct file *file)
1209{
1210 snd_timer_user_t *tu;
1211
ca2c0966 1212 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1da177e4
LT		 1213 if (tu == NULL)
1214 return -ENOMEM;
1215 spin_lock_init(&tu->qlock);
1216 init_waitqueue_head(&tu->qchange_sleep);
c1935b4d 1217 init_MUTEX(&tu->tread_sem);
1da177e4
LT		 1218 tu->ticks = 1;
1219 tu->queue_size = 128;
1220 tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1221 if (tu->queue == NULL) {
1222 kfree(tu);
1223 return -ENOMEM;
1224 }
1225 file->private_data = tu;
1226 return 0;
1227}
1228
1229static int snd_timer_user_release(struct inode *inode, struct file *file)
1230{
1231 snd_timer_user_t *tu;
1232
1233 if (file->private_data) {
1234 tu = file->private_data;
1235 file->private_data = NULL;
1236 fasync_helper(-1, file, 0, &tu->fasync);
1237 if (tu->timeri)
1238 snd_timer_close(tu->timeri);
1239 kfree(tu->queue);
1240 kfree(tu->tqueue);
1241 kfree(tu);
1242 }
1243 return 0;
1244}
1245
1246static void snd_timer_user_zero_id(snd_timer_id_t *id)
1247{
1248 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1249 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1250 id->card = -1;
1251 id->device = -1;
1252 id->subdevice = -1;
1253}
1254
1255static void snd_timer_user_copy_id(snd_timer_id_t *id, snd_timer_t *timer)
1256{
1257 id->dev_class = timer->tmr_class;
1258 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1259 id->card = timer->card ? timer->card->number : -1;
1260 id->device = timer->tmr_device;
1261 id->subdevice = timer->tmr_subdevice;
1262}
1263
1264static int snd_timer_user_next_device(snd_timer_id_t __user *_tid)
1265{
1266 snd_timer_id_t id;
1267 snd_timer_t *timer;
1268 struct list_head *p;
1269
1270 if (copy_from_user(&id, _tid, sizeof(id)))
1271 return -EFAULT;
1272 down(&register_mutex);
1273 if (id.dev_class < 0) { /* first item */
1274 if (list_empty(&snd_timer_list))
1275 snd_timer_user_zero_id(&id);
1276 else {
1277 timer = (snd_timer_t *)list_entry(snd_timer_list.next, snd_timer_t, device_list);
1278 snd_timer_user_copy_id(&id, timer);
1279 }
1280 } else {
1281 switch (id.dev_class) {
1282 case SNDRV_TIMER_CLASS_GLOBAL:
1283 id.device = id.device < 0 ? 0 : id.device + 1;
1284 list_for_each(p, &snd_timer_list) {
1285 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1286 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1287 snd_timer_user_copy_id(&id, timer);
1288 break;
1289 }
1290 if (timer->tmr_device >= id.device) {
1291 snd_timer_user_copy_id(&id, timer);
1292 break;
1293 }
1294 }
1295 if (p == &snd_timer_list)
1296 snd_timer_user_zero_id(&id);
1297 break;
1298 case SNDRV_TIMER_CLASS_CARD:
1299 case SNDRV_TIMER_CLASS_PCM:
1300 if (id.card < 0) {
1301 id.card = 0;
1302 } else {
1303 if (id.card < 0) {
1304 id.card = 0;
1305 } else {
1306 if (id.device < 0) {
1307 id.device = 0;
1308 } else {
1309 id.subdevice = id.subdevice < 0 ? 0 : id.subdevice + 1;
1310 }
1311 }
1312 }
1313 list_for_each(p, &snd_timer_list) {
1314 timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1315 if (timer->tmr_class > id.dev_class) {
1316 snd_timer_user_copy_id(&id, timer);
1317 break;
1318 }
1319 if (timer->tmr_class < id.dev_class)
1320 continue;
1321 if (timer->card->number > id.card) {
1322 snd_timer_user_copy_id(&id, timer);
1323 break;
1324 }
1325 if (timer->card->number < id.card)
1326 continue;
1327 if (timer->tmr_device > id.device) {
1328 snd_timer_user_copy_id(&id, timer);
1329 break;
1330 }
1331 if (timer->tmr_device < id.device)
1332 continue;
1333 if (timer->tmr_subdevice > id.subdevice) {
1334 snd_timer_user_copy_id(&id, timer);
1335 break;
1336 }
1337 if (timer->tmr_subdevice < id.subdevice)
1338 continue;
1339 snd_timer_user_copy_id(&id, timer);
1340 break;
1341 }
1342 if (p == &snd_timer_list)
1343 snd_timer_user_zero_id(&id);
1344 break;
1345 default:
1346 snd_timer_user_zero_id(&id);
1347 }
1348 }
1349 up(&register_mutex);
1350 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1351 return -EFAULT;
1352 return 0;
1353}
1354
1355static int snd_timer_user_ginfo(struct file *file, snd_timer_ginfo_t __user *_ginfo)
1356{
1357 snd_timer_ginfo_t *ginfo;
1358 snd_timer_id_t tid;
1359 snd_timer_t *t;
1360 struct list_head *p;
1361 int err = 0;
1362
1363 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1364 if (! ginfo)
1365 return -ENOMEM;
1366 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1367 kfree(ginfo);
1368 return -EFAULT;
1369 }
1370 tid = ginfo->tid;
1371 memset(ginfo, 0, sizeof(*ginfo));
1372 ginfo->tid = tid;
1373 down(&register_mutex);
1374 t = snd_timer_find(&tid);
1375 if (t != NULL) {
1376 ginfo->card = t->card ? t->card->number : -1;
1377 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1378 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1379 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1380 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1381 ginfo->resolution = t->hw.resolution;
1382 if (t->hw.resolution_min > 0) {
1383 ginfo->resolution_min = t->hw.resolution_min;
1384 ginfo->resolution_max = t->hw.resolution_max;
1385 }
1386 list_for_each(p, &t->open_list_head) {
1387 ginfo->clients++;
1388 }
1389 } else {
1390 err = -ENODEV;
1391 }
1392 up(&register_mutex);
1393 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1394 err = -EFAULT;
1395 kfree(ginfo);
1396 return err;
1397}
1398
1399static int snd_timer_user_gparams(struct file *file, snd_timer_gparams_t __user *_gparams)
1400{
1401 snd_timer_gparams_t gparams;
1402 snd_timer_t *t;
1403 int err;
1404
1405 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1406 return -EFAULT;
1407 down(&register_mutex);
1408 t = snd_timer_find(&gparams.tid);
1409 if (t != NULL) {
1410 if (list_empty(&t->open_list_head)) {
1411 if (t->hw.set_period)
1412 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1413 else
1414 err = -ENOSYS;
1415 } else {
1416 err = -EBUSY;
1417 }
1418 } else {
1419 err = -ENODEV;
1420 }
1421 up(&register_mutex);
1422 return err;
1423}
1424
1425static int snd_timer_user_gstatus(struct file *file, snd_timer_gstatus_t __user *_gstatus)
1426{
1427 snd_timer_gstatus_t gstatus;
1428 snd_timer_id_t tid;
1429 snd_timer_t *t;
1430 int err = 0;
1431
1432 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1433 return -EFAULT;
1434 tid = gstatus.tid;
1435 memset(&gstatus, 0, sizeof(gstatus));
1436 gstatus.tid = tid;
1437 down(&register_mutex);
1438 t = snd_timer_find(&tid);
1439 if (t != NULL) {
1440 if (t->hw.c_resolution)
1441 gstatus.resolution = t->hw.c_resolution(t);
1442 else
1443 gstatus.resolution = t->hw.resolution;
1444 if (t->hw.precise_resolution) {
1445 t->hw.precise_resolution(t, &gstatus.resolution_num, &gstatus.resolution_den);
1446 } else {
1447 gstatus.resolution_num = gstatus.resolution;
1448 gstatus.resolution_den = 1000000000uL;
1449 }
1450 } else {
1451 err = -ENODEV;
1452 }
1453 up(&register_mutex);
1454 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1455 err = -EFAULT;
1456 return err;
1457}
1458
1459static int snd_timer_user_tselect(struct file *file, snd_timer_select_t __user *_tselect)
1460{
1461 snd_timer_user_t *tu;
1462 snd_timer_select_t tselect;
1463 char str[32];
c1935b4d 1464 int err = 0;
1da177e4
LT		 1465
1466 tu = file->private_data;
c1935b4d
JK		 1467 down(&tu->tread_sem);
1468 if (tu->timeri) {
1da177e4 1469 snd_timer_close(tu->timeri);
c1935b4d
JK		 1470 tu->timeri = NULL;
1471 }
1472 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1473 err = -EFAULT;
1474 goto __err;
1475 }
1da177e4
LT		 1476 sprintf(str, "application %i", current->pid);
1477 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1478 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1479 if ((err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid)) < 0)
c1935b4d 1480 goto __err;
1da177e4 1481
4d572776
JJ		 1482 kfree(tu->queue);
1483 tu->queue = NULL;
1484 kfree(tu->tqueue);
1485 tu->tqueue = NULL;
1da177e4
LT		 1486 if (tu->tread) {
1487 tu->tqueue = (snd_timer_tread_t *)kmalloc(tu->queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
c1935b4d
JK		 1488 if (tu->tqueue == NULL)
1489 err = -ENOMEM;
1da177e4
LT		 1490 } else {
1491 tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
c1935b4d
JK		 1492 if (tu->queue == NULL)
1493 err = -ENOMEM;
1da177e4
LT		 1494 }
1495
c1935b4d
JK		 1496 if (err < 0) {
1497 snd_timer_close(tu->timeri);
1498 tu->timeri = NULL;
1499 } else {
1500 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1501 tu->timeri->callback = tu->tread ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1502 tu->timeri->ccallback = snd_timer_user_ccallback;
1503 tu->timeri->callback_data = (void *)tu;
1504 }
1505
1506 __err:
1507 up(&tu->tread_sem);
1508 return err;
1da177e4
LT		 1509}
1510
1511static int snd_timer_user_info(struct file *file, snd_timer_info_t __user *_info)
1512{
1513 snd_timer_user_t *tu;
1514 snd_timer_info_t *info;
1515 snd_timer_t *t;
1516 int err = 0;
1517
1518 tu = file->private_data;
1519 snd_assert(tu->timeri != NULL, return -ENXIO);
1520 t = tu->timeri->timer;
1521 snd_assert(t != NULL, return -ENXIO);
1522
ca2c0966 1523 info = kzalloc(sizeof(*info), GFP_KERNEL);
1da177e4
LT		 1524 if (! info)
1525 return -ENOMEM;
1526 info->card = t->card ? t->card->number : -1;
1527 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1528 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1529 strlcpy(info->id, t->id, sizeof(info->id));
1530 strlcpy(info->name, t->name, sizeof(info->name));
1531 info->resolution = t->hw.resolution;
1532 if (copy_to_user(_info, info, sizeof(*_info)))
1533 err = -EFAULT;
1534 kfree(info);
1535 return err;
1536}
1537
1538static int snd_timer_user_params(struct file *file, snd_timer_params_t __user *_params)
1539{
1540 snd_timer_user_t *tu;
1541 snd_timer_params_t params;
1542 snd_timer_t *t;
1543 snd_timer_read_t *tr;
1544 snd_timer_tread_t *ttr;
1545 int err;
1546
1547 tu = file->private_data;
1548 snd_assert(tu->timeri != NULL, return -ENXIO);
1549 t = tu->timeri->timer;
1550 snd_assert(t != NULL, return -ENXIO);
1551 if (copy_from_user(&params, _params, sizeof(params)))
1552 return -EFAULT;
1553 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1554 err = -EINVAL;
1555 goto _end;
1556 }
1557 if (params.queue_size > 0 && (params.queue_size < 32 || params.queue_size > 1024)) {
1558 err = -EINVAL;
1559 goto _end;
1560 }
1561 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1562 (1<<SNDRV_TIMER_EVENT_TICK)|
1563 (1<<SNDRV_TIMER_EVENT_START)|
1564 (1<<SNDRV_TIMER_EVENT_STOP)|
1565 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1566 (1<<SNDRV_TIMER_EVENT_PAUSE)|
a501dfa3
JK		 1567 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1568 (1<<SNDRV_TIMER_EVENT_RESUME)|
1da177e4
LT		 1569 (1<<SNDRV_TIMER_EVENT_MSTART)|
1570 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1571 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
65d11d95
JK		 1572 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1573 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
a501dfa3 1574 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1da177e4
LT		 1575 err = -EINVAL;
1576 goto _end;
1577 }
1578 snd_timer_stop(tu->timeri);
1579 spin_lock_irq(&t->lock);
1580 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1581 SNDRV_TIMER_IFLG_EXCLUSIVE|
1582 SNDRV_TIMER_IFLG_EARLY_EVENT);
1583 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1584 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1585 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1586 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1587 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1588 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1589 spin_unlock_irq(&t->lock);
1590 if (params.queue_size > 0 && (unsigned int)tu->queue_size != params.queue_size) {
1591 if (tu->tread) {
1592 ttr = (snd_timer_tread_t *)kmalloc(params.queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
1593 if (ttr) {
1594 kfree(tu->tqueue);
1595 tu->queue_size = params.queue_size;
1596 tu->tqueue = ttr;
1597 }
1598 } else {
1599 tr = (snd_timer_read_t *)kmalloc(params.queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
1600 if (tr) {
1601 kfree(tu->queue);
1602 tu->queue_size = params.queue_size;
1603 tu->queue = tr;
1604 }
1605 }
1606 }
1607 tu->qhead = tu->qtail = tu->qused = 0;
1608 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1609 if (tu->tread) {
1610 snd_timer_tread_t tread;
1611 tread.event = SNDRV_TIMER_EVENT_EARLY;
1612 tread.tstamp.tv_sec = 0;
1613 tread.tstamp.tv_nsec = 0;
1614 tread.val = 0;
1615 snd_timer_user_append_to_tqueue(tu, &tread);
1616 } else {
1617 snd_timer_read_t *r = &tu->queue[0];
1618 r->resolution = 0;
1619 r->ticks = 0;
1620 tu->qused++;
1621 tu->qtail++;
1622 }
1623
1624 }
1625 tu->filter = params.filter;
1626 tu->ticks = params.ticks;
1627 err = 0;
1628 _end:
1629 if (copy_to_user(_params, &params, sizeof(params)))
1630 return -EFAULT;
1631 return err;
1632}
1633
1634static int snd_timer_user_status(struct file *file, snd_timer_status_t __user *_status)
1635{
1636 snd_timer_user_t *tu;
1637 snd_timer_status_t status;
1638
1639 tu = file->private_data;
1640 snd_assert(tu->timeri != NULL, return -ENXIO);
1641 memset(&status, 0, sizeof(status));
1642 status.tstamp = tu->tstamp;
1643 status.resolution = snd_timer_resolution(tu->timeri);
1644 status.lost = tu->timeri->lost;
1645 status.overrun = tu->overrun;
1646 spin_lock_irq(&tu->qlock);
1647 status.queue = tu->qused;
1648 spin_unlock_irq(&tu->qlock);
1649 if (copy_to_user(_status, &status, sizeof(status)))
1650 return -EFAULT;
1651 return 0;
1652}
1653
1654static int snd_timer_user_start(struct file *file)
1655{
1656 int err;
1657 snd_timer_user_t *tu;
1658
1659 tu = file->private_data;
1660 snd_assert(tu->timeri != NULL, return -ENXIO);
1661 snd_timer_stop(tu->timeri);
1662 tu->timeri->lost = 0;
1663 tu->last_resolution = 0;
1664 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1665}
1666
1667static int snd_timer_user_stop(struct file *file)
1668{
1669 int err;
1670 snd_timer_user_t *tu;
1671
1672 tu = file->private_data;
1673 snd_assert(tu->timeri != NULL, return -ENXIO);
1674 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1675}
1676
1677static int snd_timer_user_continue(struct file *file)
1678{
1679 int err;
1680 snd_timer_user_t *tu;
1681
1682 tu = file->private_data;
1683 snd_assert(tu->timeri != NULL, return -ENXIO);
1684 tu->timeri->lost = 0;
1685 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1686}
1687
15790a6b
TI		 1688static int snd_timer_user_pause(struct file *file)
1689{
1690 int err;
1691 snd_timer_user_t *tu;
1692
1693 tu = file->private_data;
1694 snd_assert(tu->timeri != NULL, return -ENXIO);
d138b445 1695 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
15790a6b
TI		 1696}
1697
8c50b37c
TI		 1698enum {
1699 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1700 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1701 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1702 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1703};
1704
1da177e4
LT		 1705static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1706{
1707 snd_timer_user_t *tu;
1708 void __user *argp = (void __user *)arg;
1709 int __user *p = argp;
1710
1711 tu = file->private_data;
1712 switch (cmd) {
1713 case SNDRV_TIMER_IOCTL_PVERSION:
1714 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1715 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1716 return snd_timer_user_next_device(argp);
1717 case SNDRV_TIMER_IOCTL_TREAD:
1718 {
1719 int xarg;
1720
c1935b4d
JK		 1721 down(&tu->tread_sem);
1722 if (tu->timeri) { /* too late */
1723 up(&tu->tread_sem);
1da177e4 1724 return -EBUSY;
c1935b4d
JK		 1725 }
1726 if (get_user(xarg, p)) {
1727 up(&tu->tread_sem);
1da177e4 1728 return -EFAULT;
c1935b4d 1729 }
1da177e4 1730 tu->tread = xarg ? 1 : 0;
c1935b4d 1731 up(&tu->tread_sem);
1da177e4
LT		 1732 return 0;
1733 }
1734 case SNDRV_TIMER_IOCTL_GINFO:
1735 return snd_timer_user_ginfo(file, argp);
1736 case SNDRV_TIMER_IOCTL_GPARAMS:
1737 return snd_timer_user_gparams(file, argp);
1738 case SNDRV_TIMER_IOCTL_GSTATUS:
1739 return snd_timer_user_gstatus(file, argp);
1740 case SNDRV_TIMER_IOCTL_SELECT:
1741 return snd_timer_user_tselect(file, argp);
1742 case SNDRV_TIMER_IOCTL_INFO:
1743 return snd_timer_user_info(file, argp);
1744 case SNDRV_TIMER_IOCTL_PARAMS:
1745 return snd_timer_user_params(file, argp);
1746 case SNDRV_TIMER_IOCTL_STATUS:
1747 return snd_timer_user_status(file, argp);
1748 case SNDRV_TIMER_IOCTL_START:
8c50b37c 1749 case SNDRV_TIMER_IOCTL_START_OLD:
1da177e4
LT		 1750 return snd_timer_user_start(file);
1751 case SNDRV_TIMER_IOCTL_STOP:
8c50b37c 1752 case SNDRV_TIMER_IOCTL_STOP_OLD:
1da177e4
LT		 1753 return snd_timer_user_stop(file);
1754 case SNDRV_TIMER_IOCTL_CONTINUE:
8c50b37c 1755 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1da177e4 1756 return snd_timer_user_continue(file);
15790a6b 1757 case SNDRV_TIMER_IOCTL_PAUSE:
8c50b37c 1758 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
15790a6b 1759 return snd_timer_user_pause(file);
1da177e4
LT		 1760 }
1761 return -ENOTTY;
1762}
1763
1764static int snd_timer_user_fasync(int fd, struct file * file, int on)
1765{
1766 snd_timer_user_t *tu;
1767 int err;
1768
1769 tu = file->private_data;
1770 err = fasync_helper(fd, file, on, &tu->fasync);
1771 if (err < 0)
1772 return err;
1773 return 0;
1774}
1775
1776static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
1777{
1778 snd_timer_user_t *tu;
1779 long result = 0, unit;
1780 int err = 0;
1781
1782 tu = file->private_data;
1783 unit = tu->tread ? sizeof(snd_timer_tread_t) : sizeof(snd_timer_read_t);
1784 spin_lock_irq(&tu->qlock);
1785 while ((long)count - result >= unit) {
1786 while (!tu->qused) {
1787 wait_queue_t wait;
1788
1789 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1790 err = -EAGAIN;
1791 break;
1792 }
1793
1794 set_current_state(TASK_INTERRUPTIBLE);
1795 init_waitqueue_entry(&wait, current);
1796 add_wait_queue(&tu->qchange_sleep, &wait);
1797
1798 spin_unlock_irq(&tu->qlock);
1799 schedule();
1800 spin_lock_irq(&tu->qlock);
1801
1802 remove_wait_queue(&tu->qchange_sleep, &wait);
1803
1804 if (signal_pending(current)) {
1805 err = -ERESTARTSYS;
1806 break;
1807 }
1808 }
1809
1810 spin_unlock_irq(&tu->qlock);
1811 if (err < 0)
1812 goto _error;
1813
1814 if (tu->tread) {
1815 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], sizeof(snd_timer_tread_t))) {
1816 err = -EFAULT;
1817 goto _error;
1818 }
1819 } else {
1820 if (copy_to_user(buffer, &tu->queue[tu->qhead++], sizeof(snd_timer_read_t))) {
1821 err = -EFAULT;
1822 goto _error;
1823 }
1824 }
1825
1826 tu->qhead %= tu->queue_size;
1827
1828 result += unit;
1829 buffer += unit;
1830
1831 spin_lock_irq(&tu->qlock);
1832 tu->qused--;
1833 }
1834 spin_unlock_irq(&tu->qlock);
1835 _error:
1836 return result > 0 ? result : err;
1837}
1838
1839static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1840{
1841 unsigned int mask;
1842 snd_timer_user_t *tu;
1843
1844 tu = file->private_data;
1845
1846 poll_wait(file, &tu->qchange_sleep, wait);
1847
1848 mask = 0;
1849 if (tu->qused)
1850 mask |= POLLIN | POLLRDNORM;
1851
1852 return mask;
1853}
1854
1855#ifdef CONFIG_COMPAT
1856#include "timer_compat.c"
1857#else
1858#define snd_timer_user_ioctl_compat NULL
1859#endif
1860
1861static struct file_operations snd_timer_f_ops =
1862{
1863 .owner = THIS_MODULE,
1864 .read = snd_timer_user_read,
1865 .open = snd_timer_user_open,
1866 .release = snd_timer_user_release,
1867 .poll = snd_timer_user_poll,
1868 .unlocked_ioctl = snd_timer_user_ioctl,
1869 .compat_ioctl = snd_timer_user_ioctl_compat,
1870 .fasync = snd_timer_user_fasync,
1871};
1872
1873static snd_minor_t snd_timer_reg =
1874{
1875 .comment = "timer",
1876 .f_ops = &snd_timer_f_ops,
1877};
1878
1879/*
1880 * ENTRY functions
1881 */
1882
1883static snd_info_entry_t *snd_timer_proc_entry = NULL;
1884
1885static int __init alsa_timer_init(void)
1886{
1887 int err;
1888 snd_info_entry_t *entry;
1889
1890#ifdef SNDRV_OSS_INFO_DEV_TIMERS
1891 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, "system timer");
1892#endif
1893 if ((entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL)) != NULL) {
1894 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128;
1895 entry->c.text.read = snd_timer_proc_read;
1896 if (snd_info_register(entry) < 0) {
1897 snd_info_free_entry(entry);
1898 entry = NULL;
1899 }
1900 }
1901 snd_timer_proc_entry = entry;
1902 if ((err = snd_timer_register_system()) < 0)
1903 snd_printk(KERN_ERR "unable to register system timer (%i)\n", err);
1904 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER,
1905 NULL, 0, &snd_timer_reg, "timer"))<0)
1906 snd_printk(KERN_ERR "unable to register timer device (%i)\n", err);
1907 return 0;
1908}
1909
1910static void __exit alsa_timer_exit(void)
1911{
1912 struct list_head *p, *n;
1913
1914 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1915 /* unregister the system timer */
1916 list_for_each_safe(p, n, &snd_timer_list) {
1917 snd_timer_t *timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list);
1918 snd_timer_unregister(timer);
1919 }
1920 if (snd_timer_proc_entry) {
1921 snd_info_unregister(snd_timer_proc_entry);
1922 snd_timer_proc_entry = NULL;
1923 }
1924#ifdef SNDRV_OSS_INFO_DEV_TIMERS
1925 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1926#endif
1927}
1928
1929module_init(alsa_timer_init)
1930module_exit(alsa_timer_exit)
1931
1932EXPORT_SYMBOL(snd_timer_open);
1933EXPORT_SYMBOL(snd_timer_close);
1934EXPORT_SYMBOL(snd_timer_resolution);
1935EXPORT_SYMBOL(snd_timer_start);
1936EXPORT_SYMBOL(snd_timer_stop);
1937EXPORT_SYMBOL(snd_timer_continue);
1938EXPORT_SYMBOL(snd_timer_pause);
1939EXPORT_SYMBOL(snd_timer_new);
1940EXPORT_SYMBOL(snd_timer_notify);
1941EXPORT_SYMBOL(snd_timer_global_new);
1942EXPORT_SYMBOL(snd_timer_global_free);
1943EXPORT_SYMBOL(snd_timer_global_register);
1944EXPORT_SYMBOL(snd_timer_global_unregister);
1945EXPORT_SYMBOL(snd_timer_interrupt);
Linux kernel - Deliverables
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