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 /* internal flags */
39 #define SNDRV_TIMER_IFLG_PAUSED 0x00010000
40
41 #if IS_ENABLED(CONFIG_SND_HRTIMER)
42 #define DEFAULT_TIMER_LIMIT 4
43 #elif IS_ENABLED(CONFIG_SND_RTCTIMER)
44 #define DEFAULT_TIMER_LIMIT 2
45 #else
46 #define DEFAULT_TIMER_LIMIT 1
47 #endif
48
49 static int timer_limit = DEFAULT_TIMER_LIMIT;
50 static int timer_tstamp_monotonic = 1;
51 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
52 MODULE_DESCRIPTION("ALSA timer interface");
53 MODULE_LICENSE("GPL");
54 module_param(timer_limit, int, 0444);
55 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
56 module_param(timer_tstamp_monotonic, int, 0444);
57 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
58
59 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
60 MODULE_ALIAS("devname:snd/timer");
61
62 struct snd_timer_user {
63 struct snd_timer_instance *timeri;
64 int tread; /* enhanced read with timestamps and events */
65 unsigned long ticks;
66 unsigned long overrun;
67 int qhead;
68 int qtail;
69 int qused;
70 int queue_size;
71 bool disconnected;
72 struct snd_timer_read *queue;
73 struct snd_timer_tread *tqueue;
74 spinlock_t qlock;
75 unsigned long last_resolution;
76 unsigned int filter;
77 struct timespec tstamp; /* trigger tstamp */
78 wait_queue_head_t qchange_sleep;
79 struct fasync_struct *fasync;
80 struct mutex ioctl_lock;
81 };
82
83 /* list of timers */
84 static LIST_HEAD(snd_timer_list);
85
86 /* list of slave instances */
87 static LIST_HEAD(snd_timer_slave_list);
88
89 /* lock for slave active lists */
90 static DEFINE_SPINLOCK(slave_active_lock);
91
92 static DEFINE_MUTEX(register_mutex);
93
94 static int snd_timer_free(struct snd_timer *timer);
95 static int snd_timer_dev_free(struct snd_device *device);
96 static int snd_timer_dev_register(struct snd_device *device);
97 static int snd_timer_dev_disconnect(struct snd_device *device);
98
99 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
100
101 /*
102 * create a timer instance with the given owner string.
103 * when timer is not NULL, increments the module counter
104 */
snd_timer_instance_new(char * owner,struct snd_timer * timer)105 static struct snd_timer_instance *snd_timer_instance_new(char *owner,
106 struct snd_timer *timer)
107 {
108 struct snd_timer_instance *timeri;
109 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
110 if (timeri == NULL)
111 return NULL;
112 timeri->owner = kstrdup(owner, GFP_KERNEL);
113 if (! timeri->owner) {
114 kfree(timeri);
115 return NULL;
116 }
117 INIT_LIST_HEAD(&timeri->open_list);
118 INIT_LIST_HEAD(&timeri->active_list);
119 INIT_LIST_HEAD(&timeri->ack_list);
120 INIT_LIST_HEAD(&timeri->slave_list_head);
121 INIT_LIST_HEAD(&timeri->slave_active_head);
122
123 timeri->timer = timer;
124 if (timer && !try_module_get(timer->module)) {
125 kfree(timeri->owner);
126 kfree(timeri);
127 return NULL;
128 }
129
130 return timeri;
131 }
132
133 /*
134 * find a timer instance from the given timer id
135 */
snd_timer_find(struct snd_timer_id * tid)136 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
137 {
138 struct snd_timer *timer = NULL;
139
140 list_for_each_entry(timer, &snd_timer_list, device_list) {
141 if (timer->tmr_class != tid->dev_class)
142 continue;
143 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
144 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
145 (timer->card == NULL ||
146 timer->card->number != tid->card))
147 continue;
148 if (timer->tmr_device != tid->device)
149 continue;
150 if (timer->tmr_subdevice != tid->subdevice)
151 continue;
152 return timer;
153 }
154 return NULL;
155 }
156
157 #ifdef CONFIG_MODULES
158
snd_timer_request(struct snd_timer_id * tid)159 static void snd_timer_request(struct snd_timer_id *tid)
160 {
161 switch (tid->dev_class) {
162 case SNDRV_TIMER_CLASS_GLOBAL:
163 if (tid->device < timer_limit)
164 request_module("snd-timer-%i", tid->device);
165 break;
166 case SNDRV_TIMER_CLASS_CARD:
167 case SNDRV_TIMER_CLASS_PCM:
168 if (tid->card < snd_ecards_limit)
169 request_module("snd-card-%i", tid->card);
170 break;
171 default:
172 break;
173 }
174 }
175
176 #endif
177
178 /*
179 * look for a master instance matching with the slave id of the given slave.
180 * when found, relink the open_link of the slave.
181 *
182 * call this with register_mutex down.
183 */
snd_timer_check_slave(struct snd_timer_instance * slave)184 static void snd_timer_check_slave(struct snd_timer_instance *slave)
185 {
186 struct snd_timer *timer;
187 struct snd_timer_instance *master;
188
189 /* FIXME: it's really dumb to look up all entries.. */
190 list_for_each_entry(timer, &snd_timer_list, device_list) {
191 list_for_each_entry(master, &timer->open_list_head, open_list) {
192 if (slave->slave_class == master->slave_class &&
193 slave->slave_id == master->slave_id) {
194 list_move_tail(&slave->open_list,
195 &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 */
snd_timer_check_master(struct snd_timer_instance * master)212 static void snd_timer_check_master(struct snd_timer_instance *master)
213 {
214 struct snd_timer_instance *slave, *tmp;
215
216 /* check all pending slaves */
217 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
218 if (slave->slave_class == master->slave_class &&
219 slave->slave_id == master->slave_id) {
220 list_move_tail(&slave->open_list, &master->slave_list_head);
221 spin_lock_irq(&slave_active_lock);
222 spin_lock(&master->timer->lock);
223 slave->master = master;
224 slave->timer = master->timer;
225 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
226 list_add_tail(&slave->active_list,
227 &master->slave_active_head);
228 spin_unlock(&master->timer->lock);
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 */
snd_timer_open(struct snd_timer_instance ** ti,char * owner,struct snd_timer_id * tid,unsigned int slave_id)238 int snd_timer_open(struct snd_timer_instance **ti,
239 char *owner, struct snd_timer_id *tid,
240 unsigned int slave_id)
241 {
242 struct snd_timer *timer;
243 struct snd_timer_instance *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 pr_debug("ALSA: timer: invalid slave class %i\n",
250 tid->dev_sclass);
251 return -EINVAL;
252 }
253 mutex_lock(®ister_mutex);
254 timeri = snd_timer_instance_new(owner, NULL);
255 if (!timeri) {
256 mutex_unlock(®ister_mutex);
257 return -ENOMEM;
258 }
259 timeri->slave_class = tid->dev_sclass;
260 timeri->slave_id = tid->device;
261 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
262 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
263 snd_timer_check_slave(timeri);
264 mutex_unlock(®ister_mutex);
265 *ti = timeri;
266 return 0;
267 }
268
269 /* open a master instance */
270 mutex_lock(®ister_mutex);
271 timer = snd_timer_find(tid);
272 #ifdef CONFIG_MODULES
273 if (!timer) {
274 mutex_unlock(®ister_mutex);
275 snd_timer_request(tid);
276 mutex_lock(®ister_mutex);
277 timer = snd_timer_find(tid);
278 }
279 #endif
280 if (!timer) {
281 mutex_unlock(®ister_mutex);
282 return -ENODEV;
283 }
284 if (!list_empty(&timer->open_list_head)) {
285 timeri = list_entry(timer->open_list_head.next,
286 struct snd_timer_instance, open_list);
287 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
288 mutex_unlock(®ister_mutex);
289 return -EBUSY;
290 }
291 }
292 timeri = snd_timer_instance_new(owner, timer);
293 if (!timeri) {
294 mutex_unlock(®ister_mutex);
295 return -ENOMEM;
296 }
297 /* take a card refcount for safe disconnection */
298 if (timer->card)
299 get_device(&timer->card->card_dev);
300 timeri->slave_class = tid->dev_sclass;
301 timeri->slave_id = slave_id;
302
303 if (list_empty(&timer->open_list_head) && timer->hw.open) {
304 int err = timer->hw.open(timer);
305 if (err) {
306 kfree(timeri->owner);
307 kfree(timeri);
308
309 if (timer->card)
310 put_device(&timer->card->card_dev);
311 module_put(timer->module);
312 mutex_unlock(®ister_mutex);
313 return err;
314 }
315 }
316
317 list_add_tail(&timeri->open_list, &timer->open_list_head);
318 snd_timer_check_master(timeri);
319 mutex_unlock(®ister_mutex);
320 *ti = timeri;
321 return 0;
322 }
323
324 /*
325 * close a timer instance
326 */
snd_timer_close(struct snd_timer_instance * timeri)327 int snd_timer_close(struct snd_timer_instance *timeri)
328 {
329 struct snd_timer *timer = NULL;
330 struct snd_timer_instance *slave, *tmp;
331
332 if (snd_BUG_ON(!timeri))
333 return -ENXIO;
334
335 /* force to stop the timer */
336 snd_timer_stop(timeri);
337
338 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
339 /* wait, until the active callback is finished */
340 spin_lock_irq(&slave_active_lock);
341 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
342 spin_unlock_irq(&slave_active_lock);
343 udelay(10);
344 spin_lock_irq(&slave_active_lock);
345 }
346 spin_unlock_irq(&slave_active_lock);
347 mutex_lock(®ister_mutex);
348 list_del(&timeri->open_list);
349 mutex_unlock(®ister_mutex);
350 } else {
351 timer = timeri->timer;
352 if (snd_BUG_ON(!timer))
353 goto out;
354 /* wait, until the active callback is finished */
355 spin_lock_irq(&timer->lock);
356 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
357 spin_unlock_irq(&timer->lock);
358 udelay(10);
359 spin_lock_irq(&timer->lock);
360 }
361 spin_unlock_irq(&timer->lock);
362 mutex_lock(®ister_mutex);
363 list_del(&timeri->open_list);
364 if (list_empty(&timer->open_list_head) &&
365 timer->hw.close)
366 timer->hw.close(timer);
367 /* remove slave links */
368 spin_lock_irq(&slave_active_lock);
369 spin_lock(&timer->lock);
370 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
371 open_list) {
372 list_move_tail(&slave->open_list, &snd_timer_slave_list);
373 slave->master = NULL;
374 slave->timer = NULL;
375 list_del_init(&slave->ack_list);
376 list_del_init(&slave->active_list);
377 }
378 spin_unlock(&timer->lock);
379 spin_unlock_irq(&slave_active_lock);
380 /* release a card refcount for safe disconnection */
381 if (timer->card)
382 put_device(&timer->card->card_dev);
383 mutex_unlock(®ister_mutex);
384 }
385 out:
386 if (timeri->private_free)
387 timeri->private_free(timeri);
388 kfree(timeri->owner);
389 kfree(timeri);
390 if (timer)
391 module_put(timer->module);
392 return 0;
393 }
394
snd_timer_resolution(struct snd_timer_instance * timeri)395 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
396 {
397 struct snd_timer * timer;
398
399 if (timeri == NULL)
400 return 0;
401 if ((timer = timeri->timer) != NULL) {
402 if (timer->hw.c_resolution)
403 return timer->hw.c_resolution(timer);
404 return timer->hw.resolution;
405 }
406 return 0;
407 }
408
snd_timer_notify1(struct snd_timer_instance * ti,int event)409 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
410 {
411 struct snd_timer *timer;
412 unsigned long resolution = 0;
413 struct snd_timer_instance *ts;
414 struct timespec tstamp;
415
416 if (timer_tstamp_monotonic)
417 ktime_get_ts(&tstamp);
418 else
419 getnstimeofday(&tstamp);
420 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
421 event > SNDRV_TIMER_EVENT_PAUSE))
422 return;
423 if (event == SNDRV_TIMER_EVENT_START ||
424 event == SNDRV_TIMER_EVENT_CONTINUE)
425 resolution = snd_timer_resolution(ti);
426 if (ti->ccallback)
427 ti->ccallback(ti, event, &tstamp, resolution);
428 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
429 return;
430 timer = ti->timer;
431 if (timer == NULL)
432 return;
433 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
434 return;
435 list_for_each_entry(ts, &ti->slave_active_head, active_list)
436 if (ts->ccallback)
437 ts->ccallback(ts, event + 100, &tstamp, resolution);
438 }
439
440 /* start/continue a master timer */
snd_timer_start1(struct snd_timer_instance * timeri,bool start,unsigned long ticks)441 static int snd_timer_start1(struct snd_timer_instance *timeri,
442 bool start, unsigned long ticks)
443 {
444 struct snd_timer *timer;
445 int result;
446 unsigned long flags;
447
448 timer = timeri->timer;
449 if (!timer)
450 return -EINVAL;
451
452 spin_lock_irqsave(&timer->lock, flags);
453 if (timer->card && timer->card->shutdown) {
454 result = -ENODEV;
455 goto unlock;
456 }
457 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
458 SNDRV_TIMER_IFLG_START)) {
459 result = -EBUSY;
460 goto unlock;
461 }
462
463 if (start)
464 timeri->ticks = timeri->cticks = ticks;
465 else if (!timeri->cticks)
466 timeri->cticks = 1;
467 timeri->pticks = 0;
468
469 list_move_tail(&timeri->active_list, &timer->active_list_head);
470 if (timer->running) {
471 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
472 goto __start_now;
473 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
474 timeri->flags |= SNDRV_TIMER_IFLG_START;
475 result = 1; /* delayed start */
476 } else {
477 if (start)
478 timer->sticks = ticks;
479 timer->hw.start(timer);
480 __start_now:
481 timer->running++;
482 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
483 result = 0;
484 }
485 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
486 SNDRV_TIMER_EVENT_CONTINUE);
487 unlock:
488 spin_unlock_irqrestore(&timer->lock, flags);
489 return result;
490 }
491
492 /* start/continue a slave timer */
snd_timer_start_slave(struct snd_timer_instance * timeri,bool start)493 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
494 bool start)
495 {
496 unsigned long flags;
497
498 spin_lock_irqsave(&slave_active_lock, flags);
499 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
500 spin_unlock_irqrestore(&slave_active_lock, flags);
501 return -EBUSY;
502 }
503 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
504 if (timeri->master && timeri->timer) {
505 spin_lock(&timeri->timer->lock);
506 list_add_tail(&timeri->active_list,
507 &timeri->master->slave_active_head);
508 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
509 SNDRV_TIMER_EVENT_CONTINUE);
510 spin_unlock(&timeri->timer->lock);
511 }
512 spin_unlock_irqrestore(&slave_active_lock, flags);
513 return 1; /* delayed start */
514 }
515
516 /* stop/pause a master timer */
snd_timer_stop1(struct snd_timer_instance * timeri,bool stop)517 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
518 {
519 struct snd_timer *timer;
520 int result = 0;
521 unsigned long flags;
522
523 timer = timeri->timer;
524 if (!timer)
525 return -EINVAL;
526 spin_lock_irqsave(&timer->lock, flags);
527 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
528 SNDRV_TIMER_IFLG_START))) {
529 result = -EBUSY;
530 goto unlock;
531 }
532 list_del_init(&timeri->ack_list);
533 list_del_init(&timeri->active_list);
534 if (timer->card && timer->card->shutdown)
535 goto unlock;
536 if (stop) {
537 timeri->cticks = timeri->ticks;
538 timeri->pticks = 0;
539 }
540 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
541 !(--timer->running)) {
542 timer->hw.stop(timer);
543 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
544 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
545 snd_timer_reschedule(timer, 0);
546 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
547 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
548 timer->hw.start(timer);
549 }
550 }
551 }
552 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
553 if (stop)
554 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
555 else
556 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
557 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
558 SNDRV_TIMER_EVENT_CONTINUE);
559 unlock:
560 spin_unlock_irqrestore(&timer->lock, flags);
561 return result;
562 }
563
564 /* stop/pause a slave timer */
snd_timer_stop_slave(struct snd_timer_instance * timeri,bool stop)565 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
566 {
567 unsigned long flags;
568
569 spin_lock_irqsave(&slave_active_lock, flags);
570 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
571 spin_unlock_irqrestore(&slave_active_lock, flags);
572 return -EBUSY;
573 }
574 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
575 if (timeri->timer) {
576 spin_lock(&timeri->timer->lock);
577 list_del_init(&timeri->ack_list);
578 list_del_init(&timeri->active_list);
579 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
580 SNDRV_TIMER_EVENT_CONTINUE);
581 spin_unlock(&timeri->timer->lock);
582 }
583 spin_unlock_irqrestore(&slave_active_lock, flags);
584 return 0;
585 }
586
587 /*
588 * start the timer instance
589 */
snd_timer_start(struct snd_timer_instance * timeri,unsigned int ticks)590 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
591 {
592 if (timeri == NULL || ticks < 1)
593 return -EINVAL;
594 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
595 return snd_timer_start_slave(timeri, true);
596 else
597 return snd_timer_start1(timeri, true, ticks);
598 }
599
600 /*
601 * stop the timer instance.
602 *
603 * do not call this from the timer callback!
604 */
snd_timer_stop(struct snd_timer_instance * timeri)605 int snd_timer_stop(struct snd_timer_instance *timeri)
606 {
607 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
608 return snd_timer_stop_slave(timeri, true);
609 else
610 return snd_timer_stop1(timeri, true);
611 }
612
613 /*
614 * start again.. the tick is kept.
615 */
snd_timer_continue(struct snd_timer_instance * timeri)616 int snd_timer_continue(struct snd_timer_instance *timeri)
617 {
618 /* timer can continue only after pause */
619 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
620 return -EINVAL;
621
622 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
623 return snd_timer_start_slave(timeri, false);
624 else
625 return snd_timer_start1(timeri, false, 0);
626 }
627
628 /*
629 * pause.. remember the ticks left
630 */
snd_timer_pause(struct snd_timer_instance * timeri)631 int snd_timer_pause(struct snd_timer_instance * timeri)
632 {
633 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
634 return snd_timer_stop_slave(timeri, false);
635 else
636 return snd_timer_stop1(timeri, false);
637 }
638
639 /*
640 * reschedule the timer
641 *
642 * start pending instances and check the scheduling ticks.
643 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
644 */
snd_timer_reschedule(struct snd_timer * timer,unsigned long ticks_left)645 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
646 {
647 struct snd_timer_instance *ti;
648 unsigned long ticks = ~0UL;
649
650 list_for_each_entry(ti, &timer->active_list_head, active_list) {
651 if (ti->flags & SNDRV_TIMER_IFLG_START) {
652 ti->flags &= ~SNDRV_TIMER_IFLG_START;
653 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
654 timer->running++;
655 }
656 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
657 if (ticks > ti->cticks)
658 ticks = ti->cticks;
659 }
660 }
661 if (ticks == ~0UL) {
662 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
663 return;
664 }
665 if (ticks > timer->hw.ticks)
666 ticks = timer->hw.ticks;
667 if (ticks_left != ticks)
668 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
669 timer->sticks = ticks;
670 }
671
672 /*
673 * timer tasklet
674 *
675 */
snd_timer_tasklet(unsigned long arg)676 static void snd_timer_tasklet(unsigned long arg)
677 {
678 struct snd_timer *timer = (struct snd_timer *) arg;
679 struct snd_timer_instance *ti;
680 struct list_head *p;
681 unsigned long resolution, ticks;
682 unsigned long flags;
683
684 if (timer->card && timer->card->shutdown)
685 return;
686
687 spin_lock_irqsave(&timer->lock, flags);
688 /* now process all callbacks */
689 while (!list_empty(&timer->sack_list_head)) {
690 p = timer->sack_list_head.next; /* get first item */
691 ti = list_entry(p, struct snd_timer_instance, ack_list);
692
693 /* remove from ack_list and make empty */
694 list_del_init(p);
695
696 ticks = ti->pticks;
697 ti->pticks = 0;
698 resolution = ti->resolution;
699
700 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
701 spin_unlock(&timer->lock);
702 if (ti->callback)
703 ti->callback(ti, resolution, ticks);
704 spin_lock(&timer->lock);
705 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
706 }
707 spin_unlock_irqrestore(&timer->lock, flags);
708 }
709
710 /*
711 * timer interrupt
712 *
713 * ticks_left is usually equal to timer->sticks.
714 *
715 */
snd_timer_interrupt(struct snd_timer * timer,unsigned long ticks_left)716 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
717 {
718 struct snd_timer_instance *ti, *ts, *tmp;
719 unsigned long resolution, ticks;
720 struct list_head *p, *ack_list_head;
721 unsigned long flags;
722 int use_tasklet = 0;
723
724 if (timer == NULL)
725 return;
726
727 if (timer->card && timer->card->shutdown)
728 return;
729
730 spin_lock_irqsave(&timer->lock, flags);
731
732 /* remember the current resolution */
733 if (timer->hw.c_resolution)
734 resolution = timer->hw.c_resolution(timer);
735 else
736 resolution = timer->hw.resolution;
737
738 /* loop for all active instances
739 * Here we cannot use list_for_each_entry because the active_list of a
740 * processed instance is relinked to done_list_head before the callback
741 * is called.
742 */
743 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
744 active_list) {
745 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
746 continue;
747 ti->pticks += ticks_left;
748 ti->resolution = resolution;
749 if (ti->cticks < ticks_left)
750 ti->cticks = 0;
751 else
752 ti->cticks -= ticks_left;
753 if (ti->cticks) /* not expired */
754 continue;
755 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
756 ti->cticks = ti->ticks;
757 } else {
758 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
759 --timer->running;
760 list_del_init(&ti->active_list);
761 }
762 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
763 (ti->flags & SNDRV_TIMER_IFLG_FAST))
764 ack_list_head = &timer->ack_list_head;
765 else
766 ack_list_head = &timer->sack_list_head;
767 if (list_empty(&ti->ack_list))
768 list_add_tail(&ti->ack_list, ack_list_head);
769 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
770 ts->pticks = ti->pticks;
771 ts->resolution = resolution;
772 if (list_empty(&ts->ack_list))
773 list_add_tail(&ts->ack_list, ack_list_head);
774 }
775 }
776 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
777 snd_timer_reschedule(timer, timer->sticks);
778 if (timer->running) {
779 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
780 timer->hw.stop(timer);
781 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
782 }
783 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
784 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
785 /* restart timer */
786 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
787 timer->hw.start(timer);
788 }
789 } else {
790 timer->hw.stop(timer);
791 }
792
793 /* now process all fast callbacks */
794 while (!list_empty(&timer->ack_list_head)) {
795 p = timer->ack_list_head.next; /* get first item */
796 ti = list_entry(p, struct snd_timer_instance, ack_list);
797
798 /* remove from ack_list and make empty */
799 list_del_init(p);
800
801 ticks = ti->pticks;
802 ti->pticks = 0;
803
804 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
805 spin_unlock(&timer->lock);
806 if (ti->callback)
807 ti->callback(ti, resolution, ticks);
808 spin_lock(&timer->lock);
809 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
810 }
811
812 /* do we have any slow callbacks? */
813 use_tasklet = !list_empty(&timer->sack_list_head);
814 spin_unlock_irqrestore(&timer->lock, flags);
815
816 if (use_tasklet)
817 tasklet_schedule(&timer->task_queue);
818 }
819
820 /*
821
822 */
823
snd_timer_new(struct snd_card * card,char * id,struct snd_timer_id * tid,struct snd_timer ** rtimer)824 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
825 struct snd_timer **rtimer)
826 {
827 struct snd_timer *timer;
828 int err;
829 static struct snd_device_ops ops = {
830 .dev_free = snd_timer_dev_free,
831 .dev_register = snd_timer_dev_register,
832 .dev_disconnect = snd_timer_dev_disconnect,
833 };
834
835 if (snd_BUG_ON(!tid))
836 return -EINVAL;
837 if (rtimer)
838 *rtimer = NULL;
839 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
840 if (timer == NULL) {
841 pr_err("ALSA: timer: cannot allocate\n");
842 return -ENOMEM;
843 }
844 timer->tmr_class = tid->dev_class;
845 timer->card = card;
846 timer->tmr_device = tid->device;
847 timer->tmr_subdevice = tid->subdevice;
848 if (id)
849 strlcpy(timer->id, id, sizeof(timer->id));
850 timer->sticks = 1;
851 INIT_LIST_HEAD(&timer->device_list);
852 INIT_LIST_HEAD(&timer->open_list_head);
853 INIT_LIST_HEAD(&timer->active_list_head);
854 INIT_LIST_HEAD(&timer->ack_list_head);
855 INIT_LIST_HEAD(&timer->sack_list_head);
856 spin_lock_init(&timer->lock);
857 tasklet_init(&timer->task_queue, snd_timer_tasklet,
858 (unsigned long)timer);
859 if (card != NULL) {
860 timer->module = card->module;
861 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
862 if (err < 0) {
863 snd_timer_free(timer);
864 return err;
865 }
866 }
867 if (rtimer)
868 *rtimer = timer;
869 return 0;
870 }
871
snd_timer_free(struct snd_timer * timer)872 static int snd_timer_free(struct snd_timer *timer)
873 {
874 if (!timer)
875 return 0;
876
877 mutex_lock(®ister_mutex);
878 if (! list_empty(&timer->open_list_head)) {
879 struct list_head *p, *n;
880 struct snd_timer_instance *ti;
881 pr_warn("ALSA: timer %p is busy?\n", timer);
882 list_for_each_safe(p, n, &timer->open_list_head) {
883 list_del_init(p);
884 ti = list_entry(p, struct snd_timer_instance, open_list);
885 ti->timer = NULL;
886 }
887 }
888 list_del(&timer->device_list);
889 mutex_unlock(®ister_mutex);
890
891 if (timer->private_free)
892 timer->private_free(timer);
893 kfree(timer);
894 return 0;
895 }
896
snd_timer_dev_free(struct snd_device * device)897 static int snd_timer_dev_free(struct snd_device *device)
898 {
899 struct snd_timer *timer = device->device_data;
900 return snd_timer_free(timer);
901 }
902
snd_timer_dev_register(struct snd_device * dev)903 static int snd_timer_dev_register(struct snd_device *dev)
904 {
905 struct snd_timer *timer = dev->device_data;
906 struct snd_timer *timer1;
907
908 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
909 return -ENXIO;
910 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
911 !timer->hw.resolution && timer->hw.c_resolution == NULL)
912 return -EINVAL;
913
914 mutex_lock(®ister_mutex);
915 list_for_each_entry(timer1, &snd_timer_list, device_list) {
916 if (timer1->tmr_class > timer->tmr_class)
917 break;
918 if (timer1->tmr_class < timer->tmr_class)
919 continue;
920 if (timer1->card && timer->card) {
921 if (timer1->card->number > timer->card->number)
922 break;
923 if (timer1->card->number < timer->card->number)
924 continue;
925 }
926 if (timer1->tmr_device > timer->tmr_device)
927 break;
928 if (timer1->tmr_device < timer->tmr_device)
929 continue;
930 if (timer1->tmr_subdevice > timer->tmr_subdevice)
931 break;
932 if (timer1->tmr_subdevice < timer->tmr_subdevice)
933 continue;
934 /* conflicts.. */
935 mutex_unlock(®ister_mutex);
936 return -EBUSY;
937 }
938 list_add_tail(&timer->device_list, &timer1->device_list);
939 mutex_unlock(®ister_mutex);
940 return 0;
941 }
942
943 /* just for reference in snd_timer_dev_disconnect() below */
944 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
945 int event, struct timespec *tstamp,
946 unsigned long resolution);
947
snd_timer_dev_disconnect(struct snd_device * device)948 static int snd_timer_dev_disconnect(struct snd_device *device)
949 {
950 struct snd_timer *timer = device->device_data;
951 struct snd_timer_instance *ti;
952
953 mutex_lock(®ister_mutex);
954 list_del_init(&timer->device_list);
955 /* wake up pending sleepers */
956 list_for_each_entry(ti, &timer->open_list_head, open_list) {
957 /* FIXME: better to have a ti.disconnect() op */
958 if (ti->ccallback == snd_timer_user_ccallback) {
959 struct snd_timer_user *tu = ti->callback_data;
960
961 tu->disconnected = true;
962 wake_up(&tu->qchange_sleep);
963 }
964 }
965 mutex_unlock(®ister_mutex);
966 return 0;
967 }
968
snd_timer_notify(struct snd_timer * timer,int event,struct timespec * tstamp)969 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
970 {
971 unsigned long flags;
972 unsigned long resolution = 0;
973 struct snd_timer_instance *ti, *ts;
974
975 if (timer->card && timer->card->shutdown)
976 return;
977 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
978 return;
979 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
980 event > SNDRV_TIMER_EVENT_MRESUME))
981 return;
982 spin_lock_irqsave(&timer->lock, flags);
983 if (event == SNDRV_TIMER_EVENT_MSTART ||
984 event == SNDRV_TIMER_EVENT_MCONTINUE ||
985 event == SNDRV_TIMER_EVENT_MRESUME) {
986 if (timer->hw.c_resolution)
987 resolution = timer->hw.c_resolution(timer);
988 else
989 resolution = timer->hw.resolution;
990 }
991 list_for_each_entry(ti, &timer->active_list_head, active_list) {
992 if (ti->ccallback)
993 ti->ccallback(ti, event, tstamp, resolution);
994 list_for_each_entry(ts, &ti->slave_active_head, active_list)
995 if (ts->ccallback)
996 ts->ccallback(ts, event, tstamp, resolution);
997 }
998 spin_unlock_irqrestore(&timer->lock, flags);
999 }
1000
1001 /*
1002 * exported functions for global timers
1003 */
snd_timer_global_new(char * id,int device,struct snd_timer ** rtimer)1004 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1005 {
1006 struct snd_timer_id tid;
1007
1008 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1009 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1010 tid.card = -1;
1011 tid.device = device;
1012 tid.subdevice = 0;
1013 return snd_timer_new(NULL, id, &tid, rtimer);
1014 }
1015
snd_timer_global_free(struct snd_timer * timer)1016 int snd_timer_global_free(struct snd_timer *timer)
1017 {
1018 return snd_timer_free(timer);
1019 }
1020
snd_timer_global_register(struct snd_timer * timer)1021 int snd_timer_global_register(struct snd_timer *timer)
1022 {
1023 struct snd_device dev;
1024
1025 memset(&dev, 0, sizeof(dev));
1026 dev.device_data = timer;
1027 return snd_timer_dev_register(&dev);
1028 }
1029
1030 /*
1031 * System timer
1032 */
1033
1034 struct snd_timer_system_private {
1035 struct timer_list tlist;
1036 unsigned long last_expires;
1037 unsigned long last_jiffies;
1038 unsigned long correction;
1039 };
1040
snd_timer_s_function(unsigned long data)1041 static void snd_timer_s_function(unsigned long data)
1042 {
1043 struct snd_timer *timer = (struct snd_timer *)data;
1044 struct snd_timer_system_private *priv = timer->private_data;
1045 unsigned long jiff = jiffies;
1046 if (time_after(jiff, priv->last_expires))
1047 priv->correction += (long)jiff - (long)priv->last_expires;
1048 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1049 }
1050
snd_timer_s_start(struct snd_timer * timer)1051 static int snd_timer_s_start(struct snd_timer * timer)
1052 {
1053 struct snd_timer_system_private *priv;
1054 unsigned long njiff;
1055
1056 priv = (struct snd_timer_system_private *) timer->private_data;
1057 njiff = (priv->last_jiffies = jiffies);
1058 if (priv->correction > timer->sticks - 1) {
1059 priv->correction -= timer->sticks - 1;
1060 njiff++;
1061 } else {
1062 njiff += timer->sticks - priv->correction;
1063 priv->correction = 0;
1064 }
1065 priv->last_expires = njiff;
1066 mod_timer(&priv->tlist, njiff);
1067 return 0;
1068 }
1069
snd_timer_s_stop(struct snd_timer * timer)1070 static int snd_timer_s_stop(struct snd_timer * timer)
1071 {
1072 struct snd_timer_system_private *priv;
1073 unsigned long jiff;
1074
1075 priv = (struct snd_timer_system_private *) timer->private_data;
1076 del_timer(&priv->tlist);
1077 jiff = jiffies;
1078 if (time_before(jiff, priv->last_expires))
1079 timer->sticks = priv->last_expires - jiff;
1080 else
1081 timer->sticks = 1;
1082 priv->correction = 0;
1083 return 0;
1084 }
1085
1086 static struct snd_timer_hardware snd_timer_system =
1087 {
1088 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1089 .resolution = 1000000000L / HZ,
1090 .ticks = 10000000L,
1091 .start = snd_timer_s_start,
1092 .stop = snd_timer_s_stop
1093 };
1094
snd_timer_free_system(struct snd_timer * timer)1095 static void snd_timer_free_system(struct snd_timer *timer)
1096 {
1097 kfree(timer->private_data);
1098 }
1099
snd_timer_register_system(void)1100 static int snd_timer_register_system(void)
1101 {
1102 struct snd_timer *timer;
1103 struct snd_timer_system_private *priv;
1104 int err;
1105
1106 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1107 if (err < 0)
1108 return err;
1109 strcpy(timer->name, "system timer");
1110 timer->hw = snd_timer_system;
1111 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1112 if (priv == NULL) {
1113 snd_timer_free(timer);
1114 return -ENOMEM;
1115 }
1116 init_timer(&priv->tlist);
1117 priv->tlist.function = snd_timer_s_function;
1118 priv->tlist.data = (unsigned long) timer;
1119 timer->private_data = priv;
1120 timer->private_free = snd_timer_free_system;
1121 return snd_timer_global_register(timer);
1122 }
1123
1124 #ifdef CONFIG_PROC_FS
1125 /*
1126 * Info interface
1127 */
1128
snd_timer_proc_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)1129 static void snd_timer_proc_read(struct snd_info_entry *entry,
1130 struct snd_info_buffer *buffer)
1131 {
1132 struct snd_timer *timer;
1133 struct snd_timer_instance *ti;
1134
1135 mutex_lock(®ister_mutex);
1136 list_for_each_entry(timer, &snd_timer_list, device_list) {
1137 if (timer->card && timer->card->shutdown)
1138 continue;
1139 switch (timer->tmr_class) {
1140 case SNDRV_TIMER_CLASS_GLOBAL:
1141 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1142 break;
1143 case SNDRV_TIMER_CLASS_CARD:
1144 snd_iprintf(buffer, "C%i-%i: ",
1145 timer->card->number, timer->tmr_device);
1146 break;
1147 case SNDRV_TIMER_CLASS_PCM:
1148 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1149 timer->tmr_device, timer->tmr_subdevice);
1150 break;
1151 default:
1152 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1153 timer->card ? timer->card->number : -1,
1154 timer->tmr_device, timer->tmr_subdevice);
1155 }
1156 snd_iprintf(buffer, "%s :", timer->name);
1157 if (timer->hw.resolution)
1158 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1159 timer->hw.resolution / 1000,
1160 timer->hw.resolution % 1000,
1161 timer->hw.ticks);
1162 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1163 snd_iprintf(buffer, " SLAVE");
1164 snd_iprintf(buffer, "\n");
1165 list_for_each_entry(ti, &timer->open_list_head, open_list)
1166 snd_iprintf(buffer, " Client %s : %s\n",
1167 ti->owner ? ti->owner : "unknown",
1168 ti->flags & (SNDRV_TIMER_IFLG_START |
1169 SNDRV_TIMER_IFLG_RUNNING)
1170 ? "running" : "stopped");
1171 }
1172 mutex_unlock(®ister_mutex);
1173 }
1174
1175 static struct snd_info_entry *snd_timer_proc_entry;
1176
snd_timer_proc_init(void)1177 static void __init snd_timer_proc_init(void)
1178 {
1179 struct snd_info_entry *entry;
1180
1181 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1182 if (entry != NULL) {
1183 entry->c.text.read = snd_timer_proc_read;
1184 if (snd_info_register(entry) < 0) {
1185 snd_info_free_entry(entry);
1186 entry = NULL;
1187 }
1188 }
1189 snd_timer_proc_entry = entry;
1190 }
1191
snd_timer_proc_done(void)1192 static void __exit snd_timer_proc_done(void)
1193 {
1194 snd_info_free_entry(snd_timer_proc_entry);
1195 }
1196 #else /* !CONFIG_PROC_FS */
1197 #define snd_timer_proc_init()
1198 #define snd_timer_proc_done()
1199 #endif
1200
1201 /*
1202 * USER SPACE interface
1203 */
1204
snd_timer_user_interrupt(struct snd_timer_instance * timeri,unsigned long resolution,unsigned long ticks)1205 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1206 unsigned long resolution,
1207 unsigned long ticks)
1208 {
1209 struct snd_timer_user *tu = timeri->callback_data;
1210 struct snd_timer_read *r;
1211 int prev;
1212
1213 spin_lock(&tu->qlock);
1214 if (tu->qused > 0) {
1215 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1216 r = &tu->queue[prev];
1217 if (r->resolution == resolution) {
1218 r->ticks += ticks;
1219 goto __wake;
1220 }
1221 }
1222 if (tu->qused >= tu->queue_size) {
1223 tu->overrun++;
1224 } else {
1225 r = &tu->queue[tu->qtail++];
1226 tu->qtail %= tu->queue_size;
1227 r->resolution = resolution;
1228 r->ticks = ticks;
1229 tu->qused++;
1230 }
1231 __wake:
1232 spin_unlock(&tu->qlock);
1233 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1234 wake_up(&tu->qchange_sleep);
1235 }
1236
snd_timer_user_append_to_tqueue(struct snd_timer_user * tu,struct snd_timer_tread * tread)1237 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1238 struct snd_timer_tread *tread)
1239 {
1240 if (tu->qused >= tu->queue_size) {
1241 tu->overrun++;
1242 } else {
1243 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1244 tu->qtail %= tu->queue_size;
1245 tu->qused++;
1246 }
1247 }
1248
snd_timer_user_ccallback(struct snd_timer_instance * timeri,int event,struct timespec * tstamp,unsigned long resolution)1249 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1250 int event,
1251 struct timespec *tstamp,
1252 unsigned long resolution)
1253 {
1254 struct snd_timer_user *tu = timeri->callback_data;
1255 struct snd_timer_tread r1;
1256 unsigned long flags;
1257
1258 if (event >= SNDRV_TIMER_EVENT_START &&
1259 event <= SNDRV_TIMER_EVENT_PAUSE)
1260 tu->tstamp = *tstamp;
1261 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1262 return;
1263 memset(&r1, 0, sizeof(r1));
1264 r1.event = event;
1265 r1.tstamp = *tstamp;
1266 r1.val = resolution;
1267 spin_lock_irqsave(&tu->qlock, flags);
1268 snd_timer_user_append_to_tqueue(tu, &r1);
1269 spin_unlock_irqrestore(&tu->qlock, flags);
1270 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1271 wake_up(&tu->qchange_sleep);
1272 }
1273
snd_timer_user_tinterrupt(struct snd_timer_instance * timeri,unsigned long resolution,unsigned long ticks)1274 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1275 unsigned long resolution,
1276 unsigned long ticks)
1277 {
1278 struct snd_timer_user *tu = timeri->callback_data;
1279 struct snd_timer_tread *r, r1;
1280 struct timespec tstamp;
1281 int prev, append = 0;
1282
1283 memset(&tstamp, 0, sizeof(tstamp));
1284 spin_lock(&tu->qlock);
1285 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1286 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1287 spin_unlock(&tu->qlock);
1288 return;
1289 }
1290 if (tu->last_resolution != resolution || ticks > 0) {
1291 if (timer_tstamp_monotonic)
1292 ktime_get_ts(&tstamp);
1293 else
1294 getnstimeofday(&tstamp);
1295 }
1296 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1297 tu->last_resolution != resolution) {
1298 memset(&r1, 0, sizeof(r1));
1299 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1300 r1.tstamp = tstamp;
1301 r1.val = resolution;
1302 snd_timer_user_append_to_tqueue(tu, &r1);
1303 tu->last_resolution = resolution;
1304 append++;
1305 }
1306 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1307 goto __wake;
1308 if (ticks == 0)
1309 goto __wake;
1310 if (tu->qused > 0) {
1311 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1312 r = &tu->tqueue[prev];
1313 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1314 r->tstamp = tstamp;
1315 r->val += ticks;
1316 append++;
1317 goto __wake;
1318 }
1319 }
1320 r1.event = SNDRV_TIMER_EVENT_TICK;
1321 r1.tstamp = tstamp;
1322 r1.val = ticks;
1323 snd_timer_user_append_to_tqueue(tu, &r1);
1324 append++;
1325 __wake:
1326 spin_unlock(&tu->qlock);
1327 if (append == 0)
1328 return;
1329 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1330 wake_up(&tu->qchange_sleep);
1331 }
1332
snd_timer_user_open(struct inode * inode,struct file * file)1333 static int snd_timer_user_open(struct inode *inode, struct file *file)
1334 {
1335 struct snd_timer_user *tu;
1336 int err;
1337
1338 err = nonseekable_open(inode, file);
1339 if (err < 0)
1340 return err;
1341
1342 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1343 if (tu == NULL)
1344 return -ENOMEM;
1345 spin_lock_init(&tu->qlock);
1346 init_waitqueue_head(&tu->qchange_sleep);
1347 mutex_init(&tu->ioctl_lock);
1348 tu->ticks = 1;
1349 tu->queue_size = 128;
1350 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1351 GFP_KERNEL);
1352 if (tu->queue == NULL) {
1353 kfree(tu);
1354 return -ENOMEM;
1355 }
1356 file->private_data = tu;
1357 return 0;
1358 }
1359
snd_timer_user_release(struct inode * inode,struct file * file)1360 static int snd_timer_user_release(struct inode *inode, struct file *file)
1361 {
1362 struct snd_timer_user *tu;
1363
1364 if (file->private_data) {
1365 tu = file->private_data;
1366 file->private_data = NULL;
1367 mutex_lock(&tu->ioctl_lock);
1368 if (tu->timeri)
1369 snd_timer_close(tu->timeri);
1370 mutex_unlock(&tu->ioctl_lock);
1371 kfree(tu->queue);
1372 kfree(tu->tqueue);
1373 kfree(tu);
1374 }
1375 return 0;
1376 }
1377
snd_timer_user_zero_id(struct snd_timer_id * id)1378 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1379 {
1380 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1381 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1382 id->card = -1;
1383 id->device = -1;
1384 id->subdevice = -1;
1385 }
1386
snd_timer_user_copy_id(struct snd_timer_id * id,struct snd_timer * timer)1387 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1388 {
1389 id->dev_class = timer->tmr_class;
1390 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1391 id->card = timer->card ? timer->card->number : -1;
1392 id->device = timer->tmr_device;
1393 id->subdevice = timer->tmr_subdevice;
1394 }
1395
snd_timer_user_next_device(struct snd_timer_id __user * _tid)1396 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1397 {
1398 struct snd_timer_id id;
1399 struct snd_timer *timer;
1400 struct list_head *p;
1401
1402 if (copy_from_user(&id, _tid, sizeof(id)))
1403 return -EFAULT;
1404 mutex_lock(®ister_mutex);
1405 if (id.dev_class < 0) { /* first item */
1406 if (list_empty(&snd_timer_list))
1407 snd_timer_user_zero_id(&id);
1408 else {
1409 timer = list_entry(snd_timer_list.next,
1410 struct snd_timer, device_list);
1411 snd_timer_user_copy_id(&id, timer);
1412 }
1413 } else {
1414 switch (id.dev_class) {
1415 case SNDRV_TIMER_CLASS_GLOBAL:
1416 id.device = id.device < 0 ? 0 : id.device + 1;
1417 list_for_each(p, &snd_timer_list) {
1418 timer = list_entry(p, struct snd_timer, device_list);
1419 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1420 snd_timer_user_copy_id(&id, timer);
1421 break;
1422 }
1423 if (timer->tmr_device >= id.device) {
1424 snd_timer_user_copy_id(&id, timer);
1425 break;
1426 }
1427 }
1428 if (p == &snd_timer_list)
1429 snd_timer_user_zero_id(&id);
1430 break;
1431 case SNDRV_TIMER_CLASS_CARD:
1432 case SNDRV_TIMER_CLASS_PCM:
1433 if (id.card < 0) {
1434 id.card = 0;
1435 } else {
1436 if (id.card < 0) {
1437 id.card = 0;
1438 } else {
1439 if (id.device < 0) {
1440 id.device = 0;
1441 } else {
1442 if (id.subdevice < 0) {
1443 id.subdevice = 0;
1444 } else {
1445 id.subdevice++;
1446 }
1447 }
1448 }
1449 }
1450 list_for_each(p, &snd_timer_list) {
1451 timer = list_entry(p, struct snd_timer, device_list);
1452 if (timer->tmr_class > id.dev_class) {
1453 snd_timer_user_copy_id(&id, timer);
1454 break;
1455 }
1456 if (timer->tmr_class < id.dev_class)
1457 continue;
1458 if (timer->card->number > id.card) {
1459 snd_timer_user_copy_id(&id, timer);
1460 break;
1461 }
1462 if (timer->card->number < id.card)
1463 continue;
1464 if (timer->tmr_device > id.device) {
1465 snd_timer_user_copy_id(&id, timer);
1466 break;
1467 }
1468 if (timer->tmr_device < id.device)
1469 continue;
1470 if (timer->tmr_subdevice > id.subdevice) {
1471 snd_timer_user_copy_id(&id, timer);
1472 break;
1473 }
1474 if (timer->tmr_subdevice < id.subdevice)
1475 continue;
1476 snd_timer_user_copy_id(&id, timer);
1477 break;
1478 }
1479 if (p == &snd_timer_list)
1480 snd_timer_user_zero_id(&id);
1481 break;
1482 default:
1483 snd_timer_user_zero_id(&id);
1484 }
1485 }
1486 mutex_unlock(®ister_mutex);
1487 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1488 return -EFAULT;
1489 return 0;
1490 }
1491
snd_timer_user_ginfo(struct file * file,struct snd_timer_ginfo __user * _ginfo)1492 static int snd_timer_user_ginfo(struct file *file,
1493 struct snd_timer_ginfo __user *_ginfo)
1494 {
1495 struct snd_timer_ginfo *ginfo;
1496 struct snd_timer_id tid;
1497 struct snd_timer *t;
1498 struct list_head *p;
1499 int err = 0;
1500
1501 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1502 if (IS_ERR(ginfo))
1503 return PTR_ERR(ginfo);
1504
1505 tid = ginfo->tid;
1506 memset(ginfo, 0, sizeof(*ginfo));
1507 ginfo->tid = tid;
1508 mutex_lock(®ister_mutex);
1509 t = snd_timer_find(&tid);
1510 if (t != NULL) {
1511 ginfo->card = t->card ? t->card->number : -1;
1512 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1513 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1514 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1515 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1516 ginfo->resolution = t->hw.resolution;
1517 if (t->hw.resolution_min > 0) {
1518 ginfo->resolution_min = t->hw.resolution_min;
1519 ginfo->resolution_max = t->hw.resolution_max;
1520 }
1521 list_for_each(p, &t->open_list_head) {
1522 ginfo->clients++;
1523 }
1524 } else {
1525 err = -ENODEV;
1526 }
1527 mutex_unlock(®ister_mutex);
1528 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1529 err = -EFAULT;
1530 kfree(ginfo);
1531 return err;
1532 }
1533
snd_timer_user_gparams(struct file * file,struct snd_timer_gparams __user * _gparams)1534 static int snd_timer_user_gparams(struct file *file,
1535 struct snd_timer_gparams __user *_gparams)
1536 {
1537 struct snd_timer_gparams gparams;
1538 struct snd_timer *t;
1539 int err;
1540
1541 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1542 return -EFAULT;
1543 mutex_lock(®ister_mutex);
1544 t = snd_timer_find(&gparams.tid);
1545 if (!t) {
1546 err = -ENODEV;
1547 goto _error;
1548 }
1549 if (!list_empty(&t->open_list_head)) {
1550 err = -EBUSY;
1551 goto _error;
1552 }
1553 if (!t->hw.set_period) {
1554 err = -ENOSYS;
1555 goto _error;
1556 }
1557 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1558 _error:
1559 mutex_unlock(®ister_mutex);
1560 return err;
1561 }
1562
snd_timer_user_gstatus(struct file * file,struct snd_timer_gstatus __user * _gstatus)1563 static int snd_timer_user_gstatus(struct file *file,
1564 struct snd_timer_gstatus __user *_gstatus)
1565 {
1566 struct snd_timer_gstatus gstatus;
1567 struct snd_timer_id tid;
1568 struct snd_timer *t;
1569 int err = 0;
1570
1571 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1572 return -EFAULT;
1573 tid = gstatus.tid;
1574 memset(&gstatus, 0, sizeof(gstatus));
1575 gstatus.tid = tid;
1576 mutex_lock(®ister_mutex);
1577 t = snd_timer_find(&tid);
1578 if (t != NULL) {
1579 if (t->hw.c_resolution)
1580 gstatus.resolution = t->hw.c_resolution(t);
1581 else
1582 gstatus.resolution = t->hw.resolution;
1583 if (t->hw.precise_resolution) {
1584 t->hw.precise_resolution(t, &gstatus.resolution_num,
1585 &gstatus.resolution_den);
1586 } else {
1587 gstatus.resolution_num = gstatus.resolution;
1588 gstatus.resolution_den = 1000000000uL;
1589 }
1590 } else {
1591 err = -ENODEV;
1592 }
1593 mutex_unlock(®ister_mutex);
1594 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1595 err = -EFAULT;
1596 return err;
1597 }
1598
snd_timer_user_tselect(struct file * file,struct snd_timer_select __user * _tselect)1599 static int snd_timer_user_tselect(struct file *file,
1600 struct snd_timer_select __user *_tselect)
1601 {
1602 struct snd_timer_user *tu;
1603 struct snd_timer_select tselect;
1604 char str[32];
1605 int err = 0;
1606
1607 tu = file->private_data;
1608 if (tu->timeri) {
1609 snd_timer_close(tu->timeri);
1610 tu->timeri = NULL;
1611 }
1612 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1613 err = -EFAULT;
1614 goto __err;
1615 }
1616 sprintf(str, "application %i", current->pid);
1617 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1618 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1619 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1620 if (err < 0)
1621 goto __err;
1622
1623 tu->qhead = tu->qtail = tu->qused = 0;
1624 kfree(tu->queue);
1625 tu->queue = NULL;
1626 kfree(tu->tqueue);
1627 tu->tqueue = NULL;
1628 if (tu->tread) {
1629 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
1630 GFP_KERNEL);
1631 if (tu->tqueue == NULL)
1632 err = -ENOMEM;
1633 } else {
1634 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
1635 GFP_KERNEL);
1636 if (tu->queue == NULL)
1637 err = -ENOMEM;
1638 }
1639
1640 if (err < 0) {
1641 snd_timer_close(tu->timeri);
1642 tu->timeri = NULL;
1643 } else {
1644 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1645 tu->timeri->callback = tu->tread
1646 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1647 tu->timeri->ccallback = snd_timer_user_ccallback;
1648 tu->timeri->callback_data = (void *)tu;
1649 }
1650
1651 __err:
1652 return err;
1653 }
1654
snd_timer_user_info(struct file * file,struct snd_timer_info __user * _info)1655 static int snd_timer_user_info(struct file *file,
1656 struct snd_timer_info __user *_info)
1657 {
1658 struct snd_timer_user *tu;
1659 struct snd_timer_info *info;
1660 struct snd_timer *t;
1661 int err = 0;
1662
1663 tu = file->private_data;
1664 if (!tu->timeri)
1665 return -EBADFD;
1666 t = tu->timeri->timer;
1667 if (!t)
1668 return -EBADFD;
1669
1670 info = kzalloc(sizeof(*info), GFP_KERNEL);
1671 if (! info)
1672 return -ENOMEM;
1673 info->card = t->card ? t->card->number : -1;
1674 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1675 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1676 strlcpy(info->id, t->id, sizeof(info->id));
1677 strlcpy(info->name, t->name, sizeof(info->name));
1678 info->resolution = t->hw.resolution;
1679 if (copy_to_user(_info, info, sizeof(*_info)))
1680 err = -EFAULT;
1681 kfree(info);
1682 return err;
1683 }
1684
snd_timer_user_params(struct file * file,struct snd_timer_params __user * _params)1685 static int snd_timer_user_params(struct file *file,
1686 struct snd_timer_params __user *_params)
1687 {
1688 struct snd_timer_user *tu;
1689 struct snd_timer_params params;
1690 struct snd_timer *t;
1691 struct snd_timer_read *tr;
1692 struct snd_timer_tread *ttr;
1693 int err;
1694
1695 tu = file->private_data;
1696 if (!tu->timeri)
1697 return -EBADFD;
1698 t = tu->timeri->timer;
1699 if (!t)
1700 return -EBADFD;
1701 if (copy_from_user(¶ms, _params, sizeof(params)))
1702 return -EFAULT;
1703 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1704 err = -EINVAL;
1705 goto _end;
1706 }
1707 if (params.queue_size > 0 &&
1708 (params.queue_size < 32 || params.queue_size > 1024)) {
1709 err = -EINVAL;
1710 goto _end;
1711 }
1712 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1713 (1<<SNDRV_TIMER_EVENT_TICK)|
1714 (1<<SNDRV_TIMER_EVENT_START)|
1715 (1<<SNDRV_TIMER_EVENT_STOP)|
1716 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1717 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1718 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1719 (1<<SNDRV_TIMER_EVENT_RESUME)|
1720 (1<<SNDRV_TIMER_EVENT_MSTART)|
1721 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1722 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1723 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1724 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1725 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1726 err = -EINVAL;
1727 goto _end;
1728 }
1729 snd_timer_stop(tu->timeri);
1730 spin_lock_irq(&t->lock);
1731 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1732 SNDRV_TIMER_IFLG_EXCLUSIVE|
1733 SNDRV_TIMER_IFLG_EARLY_EVENT);
1734 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1735 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1736 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1737 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1738 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1739 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1740 spin_unlock_irq(&t->lock);
1741 if (params.queue_size > 0 &&
1742 (unsigned int)tu->queue_size != params.queue_size) {
1743 if (tu->tread) {
1744 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1745 GFP_KERNEL);
1746 if (ttr) {
1747 kfree(tu->tqueue);
1748 tu->queue_size = params.queue_size;
1749 tu->tqueue = ttr;
1750 }
1751 } else {
1752 tr = kmalloc(params.queue_size * sizeof(*tr),
1753 GFP_KERNEL);
1754 if (tr) {
1755 kfree(tu->queue);
1756 tu->queue_size = params.queue_size;
1757 tu->queue = tr;
1758 }
1759 }
1760 }
1761 tu->qhead = tu->qtail = tu->qused = 0;
1762 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1763 if (tu->tread) {
1764 struct snd_timer_tread tread;
1765 memset(&tread, 0, sizeof(tread));
1766 tread.event = SNDRV_TIMER_EVENT_EARLY;
1767 tread.tstamp.tv_sec = 0;
1768 tread.tstamp.tv_nsec = 0;
1769 tread.val = 0;
1770 snd_timer_user_append_to_tqueue(tu, &tread);
1771 } else {
1772 struct snd_timer_read *r = &tu->queue[0];
1773 r->resolution = 0;
1774 r->ticks = 0;
1775 tu->qused++;
1776 tu->qtail++;
1777 }
1778 }
1779 tu->filter = params.filter;
1780 tu->ticks = params.ticks;
1781 err = 0;
1782 _end:
1783 if (copy_to_user(_params, ¶ms, sizeof(params)))
1784 return -EFAULT;
1785 return err;
1786 }
1787
snd_timer_user_status(struct file * file,struct snd_timer_status __user * _status)1788 static int snd_timer_user_status(struct file *file,
1789 struct snd_timer_status __user *_status)
1790 {
1791 struct snd_timer_user *tu;
1792 struct snd_timer_status status;
1793
1794 tu = file->private_data;
1795 if (!tu->timeri)
1796 return -EBADFD;
1797 memset(&status, 0, sizeof(status));
1798 status.tstamp = tu->tstamp;
1799 status.resolution = snd_timer_resolution(tu->timeri);
1800 status.lost = tu->timeri->lost;
1801 status.overrun = tu->overrun;
1802 spin_lock_irq(&tu->qlock);
1803 status.queue = tu->qused;
1804 spin_unlock_irq(&tu->qlock);
1805 if (copy_to_user(_status, &status, sizeof(status)))
1806 return -EFAULT;
1807 return 0;
1808 }
1809
snd_timer_user_start(struct file * file)1810 static int snd_timer_user_start(struct file *file)
1811 {
1812 int err;
1813 struct snd_timer_user *tu;
1814
1815 tu = file->private_data;
1816 if (!tu->timeri)
1817 return -EBADFD;
1818 snd_timer_stop(tu->timeri);
1819 tu->timeri->lost = 0;
1820 tu->last_resolution = 0;
1821 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1822 }
1823
snd_timer_user_stop(struct file * file)1824 static int snd_timer_user_stop(struct file *file)
1825 {
1826 int err;
1827 struct snd_timer_user *tu;
1828
1829 tu = file->private_data;
1830 if (!tu->timeri)
1831 return -EBADFD;
1832 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1833 }
1834
snd_timer_user_continue(struct file * file)1835 static int snd_timer_user_continue(struct file *file)
1836 {
1837 int err;
1838 struct snd_timer_user *tu;
1839
1840 tu = file->private_data;
1841 if (!tu->timeri)
1842 return -EBADFD;
1843 /* start timer instead of continue if it's not used before */
1844 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1845 return snd_timer_user_start(file);
1846 tu->timeri->lost = 0;
1847 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1848 }
1849
snd_timer_user_pause(struct file * file)1850 static int snd_timer_user_pause(struct file *file)
1851 {
1852 int err;
1853 struct snd_timer_user *tu;
1854
1855 tu = file->private_data;
1856 if (!tu->timeri)
1857 return -EBADFD;
1858 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
1859 }
1860
1861 enum {
1862 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1863 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1864 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1865 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1866 };
1867
__snd_timer_user_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1868 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1869 unsigned long arg)
1870 {
1871 struct snd_timer_user *tu;
1872 void __user *argp = (void __user *)arg;
1873 int __user *p = argp;
1874
1875 tu = file->private_data;
1876 switch (cmd) {
1877 case SNDRV_TIMER_IOCTL_PVERSION:
1878 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1879 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1880 return snd_timer_user_next_device(argp);
1881 case SNDRV_TIMER_IOCTL_TREAD:
1882 {
1883 int xarg;
1884
1885 if (tu->timeri) /* too late */
1886 return -EBUSY;
1887 if (get_user(xarg, p))
1888 return -EFAULT;
1889 tu->tread = xarg ? 1 : 0;
1890 return 0;
1891 }
1892 case SNDRV_TIMER_IOCTL_GINFO:
1893 return snd_timer_user_ginfo(file, argp);
1894 case SNDRV_TIMER_IOCTL_GPARAMS:
1895 return snd_timer_user_gparams(file, argp);
1896 case SNDRV_TIMER_IOCTL_GSTATUS:
1897 return snd_timer_user_gstatus(file, argp);
1898 case SNDRV_TIMER_IOCTL_SELECT:
1899 return snd_timer_user_tselect(file, argp);
1900 case SNDRV_TIMER_IOCTL_INFO:
1901 return snd_timer_user_info(file, argp);
1902 case SNDRV_TIMER_IOCTL_PARAMS:
1903 return snd_timer_user_params(file, argp);
1904 case SNDRV_TIMER_IOCTL_STATUS:
1905 return snd_timer_user_status(file, argp);
1906 case SNDRV_TIMER_IOCTL_START:
1907 case SNDRV_TIMER_IOCTL_START_OLD:
1908 return snd_timer_user_start(file);
1909 case SNDRV_TIMER_IOCTL_STOP:
1910 case SNDRV_TIMER_IOCTL_STOP_OLD:
1911 return snd_timer_user_stop(file);
1912 case SNDRV_TIMER_IOCTL_CONTINUE:
1913 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1914 return snd_timer_user_continue(file);
1915 case SNDRV_TIMER_IOCTL_PAUSE:
1916 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
1917 return snd_timer_user_pause(file);
1918 }
1919 return -ENOTTY;
1920 }
1921
snd_timer_user_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1922 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1923 unsigned long arg)
1924 {
1925 struct snd_timer_user *tu = file->private_data;
1926 long ret;
1927
1928 mutex_lock(&tu->ioctl_lock);
1929 ret = __snd_timer_user_ioctl(file, cmd, arg);
1930 mutex_unlock(&tu->ioctl_lock);
1931 return ret;
1932 }
1933
snd_timer_user_fasync(int fd,struct file * file,int on)1934 static int snd_timer_user_fasync(int fd, struct file * file, int on)
1935 {
1936 struct snd_timer_user *tu;
1937
1938 tu = file->private_data;
1939 return fasync_helper(fd, file, on, &tu->fasync);
1940 }
1941
snd_timer_user_read(struct file * file,char __user * buffer,size_t count,loff_t * offset)1942 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1943 size_t count, loff_t *offset)
1944 {
1945 struct snd_timer_user *tu;
1946 long result = 0, unit;
1947 int qhead;
1948 int err = 0;
1949
1950 tu = file->private_data;
1951 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1952 mutex_lock(&tu->ioctl_lock);
1953 spin_lock_irq(&tu->qlock);
1954 while ((long)count - result >= unit) {
1955 while (!tu->qused) {
1956 wait_queue_t wait;
1957
1958 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1959 err = -EAGAIN;
1960 goto _error;
1961 }
1962
1963 set_current_state(TASK_INTERRUPTIBLE);
1964 init_waitqueue_entry(&wait, current);
1965 add_wait_queue(&tu->qchange_sleep, &wait);
1966
1967 spin_unlock_irq(&tu->qlock);
1968 mutex_unlock(&tu->ioctl_lock);
1969 schedule();
1970 mutex_lock(&tu->ioctl_lock);
1971 spin_lock_irq(&tu->qlock);
1972
1973 remove_wait_queue(&tu->qchange_sleep, &wait);
1974
1975 if (tu->disconnected) {
1976 err = -ENODEV;
1977 goto _error;
1978 }
1979 if (signal_pending(current)) {
1980 err = -ERESTARTSYS;
1981 goto _error;
1982 }
1983 }
1984
1985 qhead = tu->qhead++;
1986 tu->qhead %= tu->queue_size;
1987 tu->qused--;
1988 spin_unlock_irq(&tu->qlock);
1989
1990 if (tu->tread) {
1991 if (copy_to_user(buffer, &tu->tqueue[qhead],
1992 sizeof(struct snd_timer_tread)))
1993 err = -EFAULT;
1994 } else {
1995 if (copy_to_user(buffer, &tu->queue[qhead],
1996 sizeof(struct snd_timer_read)))
1997 err = -EFAULT;
1998 }
1999
2000 spin_lock_irq(&tu->qlock);
2001 if (err < 0)
2002 goto _error;
2003 result += unit;
2004 buffer += unit;
2005 }
2006 _error:
2007 spin_unlock_irq(&tu->qlock);
2008 mutex_unlock(&tu->ioctl_lock);
2009 return result > 0 ? result : err;
2010 }
2011
snd_timer_user_poll(struct file * file,poll_table * wait)2012 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
2013 {
2014 unsigned int mask;
2015 struct snd_timer_user *tu;
2016
2017 tu = file->private_data;
2018
2019 poll_wait(file, &tu->qchange_sleep, wait);
2020
2021 mask = 0;
2022 if (tu->qused)
2023 mask |= POLLIN | POLLRDNORM;
2024 if (tu->disconnected)
2025 mask |= POLLERR;
2026
2027 return mask;
2028 }
2029
2030 #ifdef CONFIG_COMPAT
2031 #include "timer_compat.c"
2032 #else
2033 #define snd_timer_user_ioctl_compat NULL
2034 #endif
2035
2036 static const struct file_operations snd_timer_f_ops =
2037 {
2038 .owner = THIS_MODULE,
2039 .read = snd_timer_user_read,
2040 .open = snd_timer_user_open,
2041 .release = snd_timer_user_release,
2042 .llseek = no_llseek,
2043 .poll = snd_timer_user_poll,
2044 .unlocked_ioctl = snd_timer_user_ioctl,
2045 .compat_ioctl = snd_timer_user_ioctl_compat,
2046 .fasync = snd_timer_user_fasync,
2047 };
2048
2049 /*
2050 * ENTRY functions
2051 */
2052
alsa_timer_init(void)2053 static int __init alsa_timer_init(void)
2054 {
2055 int err;
2056
2057 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2058 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2059 "system timer");
2060 #endif
2061
2062 if ((err = snd_timer_register_system()) < 0)
2063 pr_err("ALSA: unable to register system timer (%i)\n", err);
2064 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2065 &snd_timer_f_ops, NULL, "timer")) < 0)
2066 pr_err("ALSA: unable to register timer device (%i)\n", err);
2067 snd_timer_proc_init();
2068 return 0;
2069 }
2070
alsa_timer_exit(void)2071 static void __exit alsa_timer_exit(void)
2072 {
2073 struct list_head *p, *n;
2074
2075 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
2076 /* unregister the system timer */
2077 list_for_each_safe(p, n, &snd_timer_list) {
2078 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
2079 snd_timer_free(timer);
2080 }
2081 snd_timer_proc_done();
2082 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2083 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2084 #endif
2085 }
2086
2087 module_init(alsa_timer_init)
2088 module_exit(alsa_timer_exit)
2089
2090 EXPORT_SYMBOL(snd_timer_open);
2091 EXPORT_SYMBOL(snd_timer_close);
2092 EXPORT_SYMBOL(snd_timer_resolution);
2093 EXPORT_SYMBOL(snd_timer_start);
2094 EXPORT_SYMBOL(snd_timer_stop);
2095 EXPORT_SYMBOL(snd_timer_continue);
2096 EXPORT_SYMBOL(snd_timer_pause);
2097 EXPORT_SYMBOL(snd_timer_new);
2098 EXPORT_SYMBOL(snd_timer_notify);
2099 EXPORT_SYMBOL(snd_timer_global_new);
2100 EXPORT_SYMBOL(snd_timer_global_free);
2101 EXPORT_SYMBOL(snd_timer_global_register);
2102 EXPORT_SYMBOL(snd_timer_interrupt);
2103