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1 | /* |
2 | * Timers abstract layer |
3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
4 | * |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation; either version 2 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | * |
20 | */ |
21 | |
22 | #include <linux/delay.h> |
23 | #include <linux/init.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/time.h> |
26 | #include <linux/mutex.h> |
27 | #include <linux/moduleparam.h> |
28 | #include <linux/string.h> |
29 | #include <sound/core.h> |
30 | #include <sound/timer.h> |
31 | #include <sound/control.h> |
32 | #include <sound/info.h> |
33 | #include <sound/minors.h> |
34 | #include <sound/initval.h> |
35 | #include <linux/kmod.h> |
36 | |
37 | #if defined(CONFIG_SND_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE) |
38 | #define DEFAULT_TIMER_LIMIT 4 |
39 | #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE) |
40 | #define DEFAULT_TIMER_LIMIT 2 |
41 | #else |
42 | #define DEFAULT_TIMER_LIMIT 1 |
43 | #endif |
44 | |
45 | static int timer_limit = DEFAULT_TIMER_LIMIT; |
46 | static int timer_tstamp_monotonic = 1; |
47 | MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); |
48 | MODULE_DESCRIPTION("ALSA timer interface"); |
49 | MODULE_LICENSE("GPL"); |
50 | module_param(timer_limit, int, 0444); |
51 | MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); |
52 | module_param(timer_tstamp_monotonic, int, 0444); |
53 | MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); |
54 | |
55 | MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); |
56 | MODULE_ALIAS("devname:snd/timer"); |
57 | |
58 | struct snd_timer_user { |
59 | struct snd_timer_instance *timeri; |
60 | int tread; /* enhanced read with timestamps and events */ |
61 | unsigned long ticks; |
62 | unsigned long overrun; |
63 | int qhead; |
64 | int qtail; |
65 | int qused; |
66 | int queue_size; |
67 | struct snd_timer_read *queue; |
68 | struct snd_timer_tread *tqueue; |
69 | spinlock_t qlock; |
70 | unsigned long last_resolution; |
71 | unsigned int filter; |
72 | struct timespec tstamp; /* trigger tstamp */ |
73 | wait_queue_head_t qchange_sleep; |
74 | struct fasync_struct *fasync; |
75 | struct mutex tread_sem; |
76 | }; |
77 | |
78 | /* list of timers */ |
79 | static LIST_HEAD(snd_timer_list); |
80 | |
81 | /* list of slave instances */ |
82 | static LIST_HEAD(snd_timer_slave_list); |
83 | |
84 | /* lock for slave active lists */ |
85 | static DEFINE_SPINLOCK(slave_active_lock); |
86 | |
87 | static DEFINE_MUTEX(register_mutex); |
88 | |
89 | static int snd_timer_free(struct snd_timer *timer); |
90 | static int snd_timer_dev_free(struct snd_device *device); |
91 | static int snd_timer_dev_register(struct snd_device *device); |
92 | static int snd_timer_dev_disconnect(struct snd_device *device); |
93 | |
94 | static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); |
95 | |
96 | /* |
97 | * create a timer instance with the given owner string. |
98 | * when timer is not NULL, increments the module counter |
99 | */ |
100 | static struct snd_timer_instance *snd_timer_instance_new(char *owner, |
101 | struct snd_timer *timer) |
102 | { |
103 | struct snd_timer_instance *timeri; |
104 | timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); |
105 | if (timeri == NULL) |
106 | return NULL; |
107 | timeri->owner = kstrdup(owner, GFP_KERNEL); |
108 | if (! timeri->owner) { |
109 | kfree(timeri); |
110 | return NULL; |
111 | } |
112 | INIT_LIST_HEAD(&timeri->open_list); |
113 | INIT_LIST_HEAD(&timeri->active_list); |
114 | INIT_LIST_HEAD(&timeri->ack_list); |
115 | INIT_LIST_HEAD(&timeri->slave_list_head); |
116 | INIT_LIST_HEAD(&timeri->slave_active_head); |
117 | |
118 | timeri->timer = timer; |
119 | if (timer && !try_module_get(timer->module)) { |
120 | kfree(timeri->owner); |
121 | kfree(timeri); |
122 | return NULL; |
123 | } |
124 | |
125 | return timeri; |
126 | } |
127 | |
128 | /* |
129 | * find a timer instance from the given timer id |
130 | */ |
131 | static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) |
132 | { |
133 | struct snd_timer *timer = NULL; |
134 | |
135 | list_for_each_entry(timer, &snd_timer_list, device_list) { |
136 | if (timer->tmr_class != tid->dev_class) |
137 | continue; |
138 | if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || |
139 | timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && |
140 | (timer->card == NULL || |
141 | timer->card->number != tid->card)) |
142 | continue; |
143 | if (timer->tmr_device != tid->device) |
144 | continue; |
145 | if (timer->tmr_subdevice != tid->subdevice) |
146 | continue; |
147 | return timer; |
148 | } |
149 | return NULL; |
150 | } |
151 | |
152 | #ifdef CONFIG_MODULES |
153 | |
154 | static void snd_timer_request(struct snd_timer_id *tid) |
155 | { |
156 | switch (tid->dev_class) { |
157 | case SNDRV_TIMER_CLASS_GLOBAL: |
158 | if (tid->device < timer_limit) |
159 | request_module("snd-timer-%i", tid->device); |
160 | break; |
161 | case SNDRV_TIMER_CLASS_CARD: |
162 | case SNDRV_TIMER_CLASS_PCM: |
163 | if (tid->card < snd_ecards_limit) |
164 | request_module("snd-card-%i", tid->card); |
165 | break; |
166 | default: |
167 | break; |
168 | } |
169 | } |
170 | |
171 | #endif |
172 | |
173 | /* |
174 | * look for a master instance matching with the slave id of the given slave. |
175 | * when found, relink the open_link of the slave. |
176 | * |
177 | * call this with register_mutex down. |
178 | */ |
179 | static void snd_timer_check_slave(struct snd_timer_instance *slave) |
180 | { |
181 | struct snd_timer *timer; |
182 | struct snd_timer_instance *master; |
183 | |
184 | /* FIXME: it's really dumb to look up all entries.. */ |
185 | list_for_each_entry(timer, &snd_timer_list, device_list) { |
186 | list_for_each_entry(master, &timer->open_list_head, open_list) { |
187 | if (slave->slave_class == master->slave_class && |
188 | slave->slave_id == master->slave_id) { |
189 | list_move_tail(&slave->open_list, |
190 | &master->slave_list_head); |
191 | spin_lock_irq(&slave_active_lock); |
192 | slave->master = master; |
193 | slave->timer = master->timer; |
194 | spin_unlock_irq(&slave_active_lock); |
195 | return; |
196 | } |
197 | } |
198 | } |
199 | } |
200 | |
201 | /* |
202 | * look for slave instances matching with the slave id of the given master. |
203 | * when found, relink the open_link of slaves. |
204 | * |
205 | * call this with register_mutex down. |
206 | */ |
207 | static void snd_timer_check_master(struct snd_timer_instance *master) |
208 | { |
209 | struct snd_timer_instance *slave, *tmp; |
210 | |
211 | /* check all pending slaves */ |
212 | list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { |
213 | if (slave->slave_class == master->slave_class && |
214 | slave->slave_id == master->slave_id) { |
215 | list_move_tail(&slave->open_list, &master->slave_list_head); |
216 | spin_lock_irq(&slave_active_lock); |
217 | slave->master = master; |
218 | slave->timer = master->timer; |
219 | if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) |
220 | list_add_tail(&slave->active_list, |
221 | &master->slave_active_head); |
222 | spin_unlock_irq(&slave_active_lock); |
223 | } |
224 | } |
225 | } |
226 | |
227 | /* |
228 | * open a timer instance |
229 | * when opening a master, the slave id must be here given. |
230 | */ |
231 | int snd_timer_open(struct snd_timer_instance **ti, |
232 | char *owner, struct snd_timer_id *tid, |
233 | unsigned int slave_id) |
234 | { |
235 | struct snd_timer *timer; |
236 | struct snd_timer_instance *timeri = NULL; |
237 | |
238 | if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { |
239 | /* open a slave instance */ |
240 | if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || |
241 | tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { |
242 | snd_printd("invalid slave class %i\n", tid->dev_sclass); |
243 | return -EINVAL; |
244 | } |
245 | mutex_lock(®ister_mutex); |
246 | timeri = snd_timer_instance_new(owner, NULL); |
247 | if (!timeri) { |
248 | mutex_unlock(®ister_mutex); |
249 | return -ENOMEM; |
250 | } |
251 | timeri->slave_class = tid->dev_sclass; |
252 | timeri->slave_id = tid->device; |
253 | timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; |
254 | list_add_tail(&timeri->open_list, &snd_timer_slave_list); |
255 | snd_timer_check_slave(timeri); |
256 | mutex_unlock(®ister_mutex); |
257 | *ti = timeri; |
258 | return 0; |
259 | } |
260 | |
261 | /* open a master instance */ |
262 | mutex_lock(®ister_mutex); |
263 | timer = snd_timer_find(tid); |
264 | #ifdef CONFIG_MODULES |
265 | if (!timer) { |
266 | mutex_unlock(®ister_mutex); |
267 | snd_timer_request(tid); |
268 | mutex_lock(®ister_mutex); |
269 | timer = snd_timer_find(tid); |
270 | } |
271 | #endif |
272 | if (!timer) { |
273 | mutex_unlock(®ister_mutex); |
274 | return -ENODEV; |
275 | } |
276 | if (!list_empty(&timer->open_list_head)) { |
277 | timeri = list_entry(timer->open_list_head.next, |
278 | struct snd_timer_instance, open_list); |
279 | if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { |
280 | mutex_unlock(®ister_mutex); |
281 | return -EBUSY; |
282 | } |
283 | } |
284 | timeri = snd_timer_instance_new(owner, timer); |
285 | if (!timeri) { |
286 | mutex_unlock(®ister_mutex); |
287 | return -ENOMEM; |
288 | } |
289 | timeri->slave_class = tid->dev_sclass; |
290 | timeri->slave_id = slave_id; |
291 | if (list_empty(&timer->open_list_head) && timer->hw.open) |
292 | timer->hw.open(timer); |
293 | list_add_tail(&timeri->open_list, &timer->open_list_head); |
294 | snd_timer_check_master(timeri); |
295 | mutex_unlock(®ister_mutex); |
296 | *ti = timeri; |
297 | return 0; |
298 | } |
299 | |
300 | static int _snd_timer_stop(struct snd_timer_instance *timeri, |
301 | int keep_flag, int event); |
302 | |
303 | /* |
304 | * close a timer instance |
305 | */ |
306 | int snd_timer_close(struct snd_timer_instance *timeri) |
307 | { |
308 | struct snd_timer *timer = NULL; |
309 | struct snd_timer_instance *slave, *tmp; |
310 | |
311 | if (snd_BUG_ON(!timeri)) |
312 | return -ENXIO; |
313 | |
314 | /* force to stop the timer */ |
315 | snd_timer_stop(timeri); |
316 | |
317 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { |
318 | /* wait, until the active callback is finished */ |
319 | spin_lock_irq(&slave_active_lock); |
320 | while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { |
321 | spin_unlock_irq(&slave_active_lock); |
322 | udelay(10); |
323 | spin_lock_irq(&slave_active_lock); |
324 | } |
325 | spin_unlock_irq(&slave_active_lock); |
326 | mutex_lock(®ister_mutex); |
327 | list_del(&timeri->open_list); |
328 | mutex_unlock(®ister_mutex); |
329 | } else { |
330 | timer = timeri->timer; |
331 | if (snd_BUG_ON(!timer)) |
332 | goto out; |
333 | /* wait, until the active callback is finished */ |
334 | spin_lock_irq(&timer->lock); |
335 | while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { |
336 | spin_unlock_irq(&timer->lock); |
337 | udelay(10); |
338 | spin_lock_irq(&timer->lock); |
339 | } |
340 | spin_unlock_irq(&timer->lock); |
341 | mutex_lock(®ister_mutex); |
342 | list_del(&timeri->open_list); |
343 | if (timer && list_empty(&timer->open_list_head) && |
344 | timer->hw.close) |
345 | timer->hw.close(timer); |
346 | /* remove slave links */ |
347 | list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, |
348 | open_list) { |
349 | spin_lock_irq(&slave_active_lock); |
350 | _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); |
351 | list_move_tail(&slave->open_list, &snd_timer_slave_list); |
352 | slave->master = NULL; |
353 | slave->timer = NULL; |
354 | spin_unlock_irq(&slave_active_lock); |
355 | } |
356 | mutex_unlock(®ister_mutex); |
357 | } |
358 | out: |
359 | if (timeri->private_free) |
360 | timeri->private_free(timeri); |
361 | kfree(timeri->owner); |
362 | kfree(timeri); |
363 | if (timer) |
364 | module_put(timer->module); |
365 | return 0; |
366 | } |
367 | |
368 | unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) |
369 | { |
370 | struct snd_timer * timer; |
371 | |
372 | if (timeri == NULL) |
373 | return 0; |
374 | if ((timer = timeri->timer) != NULL) { |
375 | if (timer->hw.c_resolution) |
376 | return timer->hw.c_resolution(timer); |
377 | return timer->hw.resolution; |
378 | } |
379 | return 0; |
380 | } |
381 | |
382 | static void snd_timer_notify1(struct snd_timer_instance *ti, int event) |
383 | { |
384 | struct snd_timer *timer; |
385 | unsigned long flags; |
386 | unsigned long resolution = 0; |
387 | struct snd_timer_instance *ts; |
388 | struct timespec tstamp; |
389 | |
390 | if (timer_tstamp_monotonic) |
391 | do_posix_clock_monotonic_gettime(&tstamp); |
392 | else |
393 | getnstimeofday(&tstamp); |
394 | if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || |
395 | event > SNDRV_TIMER_EVENT_PAUSE)) |
396 | return; |
397 | if (event == SNDRV_TIMER_EVENT_START || |
398 | event == SNDRV_TIMER_EVENT_CONTINUE) |
399 | resolution = snd_timer_resolution(ti); |
400 | if (ti->ccallback) |
401 | ti->ccallback(ti, event, &tstamp, resolution); |
402 | if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) |
403 | return; |
404 | timer = ti->timer; |
405 | if (timer == NULL) |
406 | return; |
407 | if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) |
408 | return; |
409 | spin_lock_irqsave(&timer->lock, flags); |
410 | list_for_each_entry(ts, &ti->slave_active_head, active_list) |
411 | if (ts->ccallback) |
412 | ts->ccallback(ti, event + 100, &tstamp, resolution); |
413 | spin_unlock_irqrestore(&timer->lock, flags); |
414 | } |
415 | |
416 | static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, |
417 | unsigned long sticks) |
418 | { |
419 | list_move_tail(&timeri->active_list, &timer->active_list_head); |
420 | if (timer->running) { |
421 | if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) |
422 | goto __start_now; |
423 | timer->flags |= SNDRV_TIMER_FLG_RESCHED; |
424 | timeri->flags |= SNDRV_TIMER_IFLG_START; |
425 | return 1; /* delayed start */ |
426 | } else { |
427 | timer->sticks = sticks; |
428 | timer->hw.start(timer); |
429 | __start_now: |
430 | timer->running++; |
431 | timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; |
432 | return 0; |
433 | } |
434 | } |
435 | |
436 | static int snd_timer_start_slave(struct snd_timer_instance *timeri) |
437 | { |
438 | unsigned long flags; |
439 | |
440 | spin_lock_irqsave(&slave_active_lock, flags); |
441 | timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; |
442 | if (timeri->master) |
443 | list_add_tail(&timeri->active_list, |
444 | &timeri->master->slave_active_head); |
445 | spin_unlock_irqrestore(&slave_active_lock, flags); |
446 | return 1; /* delayed start */ |
447 | } |
448 | |
449 | /* |
450 | * start the timer instance |
451 | */ |
452 | int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) |
453 | { |
454 | struct snd_timer *timer; |
455 | int result = -EINVAL; |
456 | unsigned long flags; |
457 | |
458 | if (timeri == NULL || ticks < 1) |
459 | return -EINVAL; |
460 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { |
461 | result = snd_timer_start_slave(timeri); |
462 | snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); |
463 | return result; |
464 | } |
465 | timer = timeri->timer; |
466 | if (timer == NULL) |
467 | return -EINVAL; |
468 | spin_lock_irqsave(&timer->lock, flags); |
469 | timeri->ticks = timeri->cticks = ticks; |
470 | timeri->pticks = 0; |
471 | result = snd_timer_start1(timer, timeri, ticks); |
472 | spin_unlock_irqrestore(&timer->lock, flags); |
473 | snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); |
474 | return result; |
475 | } |
476 | |
477 | static int _snd_timer_stop(struct snd_timer_instance * timeri, |
478 | int keep_flag, int event) |
479 | { |
480 | struct snd_timer *timer; |
481 | unsigned long flags; |
482 | |
483 | if (snd_BUG_ON(!timeri)) |
484 | return -ENXIO; |
485 | |
486 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { |
487 | if (!keep_flag) { |
488 | spin_lock_irqsave(&slave_active_lock, flags); |
489 | timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; |
490 | spin_unlock_irqrestore(&slave_active_lock, flags); |
491 | } |
492 | goto __end; |
493 | } |
494 | timer = timeri->timer; |
495 | if (!timer) |
496 | return -EINVAL; |
497 | spin_lock_irqsave(&timer->lock, flags); |
498 | list_del_init(&timeri->ack_list); |
499 | list_del_init(&timeri->active_list); |
500 | if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && |
501 | !(--timer->running)) { |
502 | timer->hw.stop(timer); |
503 | if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { |
504 | timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; |
505 | snd_timer_reschedule(timer, 0); |
506 | if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { |
507 | timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; |
508 | timer->hw.start(timer); |
509 | } |
510 | } |
511 | } |
512 | if (!keep_flag) |
513 | timeri->flags &= |
514 | ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); |
515 | spin_unlock_irqrestore(&timer->lock, flags); |
516 | __end: |
517 | if (event != SNDRV_TIMER_EVENT_RESOLUTION) |
518 | snd_timer_notify1(timeri, event); |
519 | return 0; |
520 | } |
521 | |
522 | /* |
523 | * stop the timer instance. |
524 | * |
525 | * do not call this from the timer callback! |
526 | */ |
527 | int snd_timer_stop(struct snd_timer_instance *timeri) |
528 | { |
529 | struct snd_timer *timer; |
530 | unsigned long flags; |
531 | int err; |
532 | |
533 | err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); |
534 | if (err < 0) |
535 | return err; |
536 | timer = timeri->timer; |
537 | if (!timer) |
538 | return -EINVAL; |
539 | spin_lock_irqsave(&timer->lock, flags); |
540 | timeri->cticks = timeri->ticks; |
541 | timeri->pticks = 0; |
542 | spin_unlock_irqrestore(&timer->lock, flags); |
543 | return 0; |
544 | } |
545 | |
546 | /* |
547 | * start again.. the tick is kept. |
548 | */ |
549 | int snd_timer_continue(struct snd_timer_instance *timeri) |
550 | { |
551 | struct snd_timer *timer; |
552 | int result = -EINVAL; |
553 | unsigned long flags; |
554 | |
555 | if (timeri == NULL) |
556 | return result; |
557 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) |
558 | return snd_timer_start_slave(timeri); |
559 | timer = timeri->timer; |
560 | if (! timer) |
561 | return -EINVAL; |
562 | spin_lock_irqsave(&timer->lock, flags); |
563 | if (!timeri->cticks) |
564 | timeri->cticks = 1; |
565 | timeri->pticks = 0; |
566 | result = snd_timer_start1(timer, timeri, timer->sticks); |
567 | spin_unlock_irqrestore(&timer->lock, flags); |
568 | snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); |
569 | return result; |
570 | } |
571 | |
572 | /* |
573 | * pause.. remember the ticks left |
574 | */ |
575 | int snd_timer_pause(struct snd_timer_instance * timeri) |
576 | { |
577 | return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); |
578 | } |
579 | |
580 | /* |
581 | * reschedule the timer |
582 | * |
583 | * start pending instances and check the scheduling ticks. |
584 | * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. |
585 | */ |
586 | static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) |
587 | { |
588 | struct snd_timer_instance *ti; |
589 | unsigned long ticks = ~0UL; |
590 | |
591 | list_for_each_entry(ti, &timer->active_list_head, active_list) { |
592 | if (ti->flags & SNDRV_TIMER_IFLG_START) { |
593 | ti->flags &= ~SNDRV_TIMER_IFLG_START; |
594 | ti->flags |= SNDRV_TIMER_IFLG_RUNNING; |
595 | timer->running++; |
596 | } |
597 | if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { |
598 | if (ticks > ti->cticks) |
599 | ticks = ti->cticks; |
600 | } |
601 | } |
602 | if (ticks == ~0UL) { |
603 | timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; |
604 | return; |
605 | } |
606 | if (ticks > timer->hw.ticks) |
607 | ticks = timer->hw.ticks; |
608 | if (ticks_left != ticks) |
609 | timer->flags |= SNDRV_TIMER_FLG_CHANGE; |
610 | timer->sticks = ticks; |
611 | } |
612 | |
613 | /* |
614 | * timer tasklet |
615 | * |
616 | */ |
617 | static void snd_timer_tasklet(unsigned long arg) |
618 | { |
619 | struct snd_timer *timer = (struct snd_timer *) arg; |
620 | struct snd_timer_instance *ti; |
621 | struct list_head *p; |
622 | unsigned long resolution, ticks; |
623 | unsigned long flags; |
624 | |
625 | spin_lock_irqsave(&timer->lock, flags); |
626 | /* now process all callbacks */ |
627 | while (!list_empty(&timer->sack_list_head)) { |
628 | p = timer->sack_list_head.next; /* get first item */ |
629 | ti = list_entry(p, struct snd_timer_instance, ack_list); |
630 | |
631 | /* remove from ack_list and make empty */ |
632 | list_del_init(p); |
633 | |
634 | ticks = ti->pticks; |
635 | ti->pticks = 0; |
636 | resolution = ti->resolution; |
637 | |
638 | ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; |
639 | spin_unlock(&timer->lock); |
640 | if (ti->callback) |
641 | ti->callback(ti, resolution, ticks); |
642 | spin_lock(&timer->lock); |
643 | ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; |
644 | } |
645 | spin_unlock_irqrestore(&timer->lock, flags); |
646 | } |
647 | |
648 | /* |
649 | * timer interrupt |
650 | * |
651 | * ticks_left is usually equal to timer->sticks. |
652 | * |
653 | */ |
654 | void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) |
655 | { |
656 | struct snd_timer_instance *ti, *ts, *tmp; |
657 | unsigned long resolution, ticks; |
658 | struct list_head *p, *ack_list_head; |
659 | unsigned long flags; |
660 | int use_tasklet = 0; |
661 | |
662 | if (timer == NULL) |
663 | return; |
664 | |
665 | spin_lock_irqsave(&timer->lock, flags); |
666 | |
667 | /* remember the current resolution */ |
668 | if (timer->hw.c_resolution) |
669 | resolution = timer->hw.c_resolution(timer); |
670 | else |
671 | resolution = timer->hw.resolution; |
672 | |
673 | /* loop for all active instances |
674 | * Here we cannot use list_for_each_entry because the active_list of a |
675 | * processed instance is relinked to done_list_head before the callback |
676 | * is called. |
677 | */ |
678 | list_for_each_entry_safe(ti, tmp, &timer->active_list_head, |
679 | active_list) { |
680 | if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) |
681 | continue; |
682 | ti->pticks += ticks_left; |
683 | ti->resolution = resolution; |
684 | if (ti->cticks < ticks_left) |
685 | ti->cticks = 0; |
686 | else |
687 | ti->cticks -= ticks_left; |
688 | if (ti->cticks) /* not expired */ |
689 | continue; |
690 | if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { |
691 | ti->cticks = ti->ticks; |
692 | } else { |
693 | ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; |
694 | if (--timer->running) |
695 | list_del(&ti->active_list); |
696 | } |
697 | if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || |
698 | (ti->flags & SNDRV_TIMER_IFLG_FAST)) |
699 | ack_list_head = &timer->ack_list_head; |
700 | else |
701 | ack_list_head = &timer->sack_list_head; |
702 | if (list_empty(&ti->ack_list)) |
703 | list_add_tail(&ti->ack_list, ack_list_head); |
704 | list_for_each_entry(ts, &ti->slave_active_head, active_list) { |
705 | ts->pticks = ti->pticks; |
706 | ts->resolution = resolution; |
707 | if (list_empty(&ts->ack_list)) |
708 | list_add_tail(&ts->ack_list, ack_list_head); |
709 | } |
710 | } |
711 | if (timer->flags & SNDRV_TIMER_FLG_RESCHED) |
712 | snd_timer_reschedule(timer, timer->sticks); |
713 | if (timer->running) { |
714 | if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { |
715 | timer->hw.stop(timer); |
716 | timer->flags |= SNDRV_TIMER_FLG_CHANGE; |
717 | } |
718 | if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || |
719 | (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { |
720 | /* restart timer */ |
721 | timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; |
722 | timer->hw.start(timer); |
723 | } |
724 | } else { |
725 | timer->hw.stop(timer); |
726 | } |
727 | |
728 | /* now process all fast callbacks */ |
729 | while (!list_empty(&timer->ack_list_head)) { |
730 | p = timer->ack_list_head.next; /* get first item */ |
731 | ti = list_entry(p, struct snd_timer_instance, ack_list); |
732 | |
733 | /* remove from ack_list and make empty */ |
734 | list_del_init(p); |
735 | |
736 | ticks = ti->pticks; |
737 | ti->pticks = 0; |
738 | |
739 | ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; |
740 | spin_unlock(&timer->lock); |
741 | if (ti->callback) |
742 | ti->callback(ti, resolution, ticks); |
743 | spin_lock(&timer->lock); |
744 | ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; |
745 | } |
746 | |
747 | /* do we have any slow callbacks? */ |
748 | use_tasklet = !list_empty(&timer->sack_list_head); |
749 | spin_unlock_irqrestore(&timer->lock, flags); |
750 | |
751 | if (use_tasklet) |
752 | tasklet_schedule(&timer->task_queue); |
753 | } |
754 | |
755 | /* |
756 | |
757 | */ |
758 | |
759 | int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, |
760 | struct snd_timer **rtimer) |
761 | { |
762 | struct snd_timer *timer; |
763 | int err; |
764 | static struct snd_device_ops ops = { |
765 | .dev_free = snd_timer_dev_free, |
766 | .dev_register = snd_timer_dev_register, |
767 | .dev_disconnect = snd_timer_dev_disconnect, |
768 | }; |
769 | |
770 | if (snd_BUG_ON(!tid)) |
771 | return -EINVAL; |
772 | if (rtimer) |
773 | *rtimer = NULL; |
774 | timer = kzalloc(sizeof(*timer), GFP_KERNEL); |
775 | if (timer == NULL) { |
776 | snd_printk(KERN_ERR "timer: cannot allocate\n"); |
777 | return -ENOMEM; |
778 | } |
779 | timer->tmr_class = tid->dev_class; |
780 | timer->card = card; |
781 | timer->tmr_device = tid->device; |
782 | timer->tmr_subdevice = tid->subdevice; |
783 | if (id) |
784 | strlcpy(timer->id, id, sizeof(timer->id)); |
785 | INIT_LIST_HEAD(&timer->device_list); |
786 | INIT_LIST_HEAD(&timer->open_list_head); |
787 | INIT_LIST_HEAD(&timer->active_list_head); |
788 | INIT_LIST_HEAD(&timer->ack_list_head); |
789 | INIT_LIST_HEAD(&timer->sack_list_head); |
790 | spin_lock_init(&timer->lock); |
791 | tasklet_init(&timer->task_queue, snd_timer_tasklet, |
792 | (unsigned long)timer); |
793 | if (card != NULL) { |
794 | timer->module = card->module; |
795 | err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); |
796 | if (err < 0) { |
797 | snd_timer_free(timer); |
798 | return err; |
799 | } |
800 | } |
801 | if (rtimer) |
802 | *rtimer = timer; |
803 | return 0; |
804 | } |
805 | |
806 | static int snd_timer_free(struct snd_timer *timer) |
807 | { |
808 | if (!timer) |
809 | return 0; |
810 | |
811 | mutex_lock(®ister_mutex); |
812 | if (! list_empty(&timer->open_list_head)) { |
813 | struct list_head *p, *n; |
814 | struct snd_timer_instance *ti; |
815 | snd_printk(KERN_WARNING "timer %p is busy?\n", timer); |
816 | list_for_each_safe(p, n, &timer->open_list_head) { |
817 | list_del_init(p); |
818 | ti = list_entry(p, struct snd_timer_instance, open_list); |
819 | ti->timer = NULL; |
820 | } |
821 | } |
822 | list_del(&timer->device_list); |
823 | mutex_unlock(®ister_mutex); |
824 | |
825 | if (timer->private_free) |
826 | timer->private_free(timer); |
827 | kfree(timer); |
828 | return 0; |
829 | } |
830 | |
831 | static int snd_timer_dev_free(struct snd_device *device) |
832 | { |
833 | struct snd_timer *timer = device->device_data; |
834 | return snd_timer_free(timer); |
835 | } |
836 | |
837 | static int snd_timer_dev_register(struct snd_device *dev) |
838 | { |
839 | struct snd_timer *timer = dev->device_data; |
840 | struct snd_timer *timer1; |
841 | |
842 | if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) |
843 | return -ENXIO; |
844 | if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && |
845 | !timer->hw.resolution && timer->hw.c_resolution == NULL) |
846 | return -EINVAL; |
847 | |
848 | mutex_lock(®ister_mutex); |
849 | list_for_each_entry(timer1, &snd_timer_list, device_list) { |
850 | if (timer1->tmr_class > timer->tmr_class) |
851 | break; |
852 | if (timer1->tmr_class < timer->tmr_class) |
853 | continue; |
854 | if (timer1->card && timer->card) { |
855 | if (timer1->card->number > timer->card->number) |
856 | break; |
857 | if (timer1->card->number < timer->card->number) |
858 | continue; |
859 | } |
860 | if (timer1->tmr_device > timer->tmr_device) |
861 | break; |
862 | if (timer1->tmr_device < timer->tmr_device) |
863 | continue; |
864 | if (timer1->tmr_subdevice > timer->tmr_subdevice) |
865 | break; |
866 | if (timer1->tmr_subdevice < timer->tmr_subdevice) |
867 | continue; |
868 | /* conflicts.. */ |
869 | mutex_unlock(®ister_mutex); |
870 | return -EBUSY; |
871 | } |
872 | list_add_tail(&timer->device_list, &timer1->device_list); |
873 | mutex_unlock(®ister_mutex); |
874 | return 0; |
875 | } |
876 | |
877 | static int snd_timer_dev_disconnect(struct snd_device *device) |
878 | { |
879 | struct snd_timer *timer = device->device_data; |
880 | mutex_lock(®ister_mutex); |
881 | list_del_init(&timer->device_list); |
882 | mutex_unlock(®ister_mutex); |
883 | return 0; |
884 | } |
885 | |
886 | void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) |
887 | { |
888 | unsigned long flags; |
889 | unsigned long resolution = 0; |
890 | struct snd_timer_instance *ti, *ts; |
891 | |
892 | if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) |
893 | return; |
894 | if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || |
895 | event > SNDRV_TIMER_EVENT_MRESUME)) |
896 | return; |
897 | spin_lock_irqsave(&timer->lock, flags); |
898 | if (event == SNDRV_TIMER_EVENT_MSTART || |
899 | event == SNDRV_TIMER_EVENT_MCONTINUE || |
900 | event == SNDRV_TIMER_EVENT_MRESUME) { |
901 | if (timer->hw.c_resolution) |
902 | resolution = timer->hw.c_resolution(timer); |
903 | else |
904 | resolution = timer->hw.resolution; |
905 | } |
906 | list_for_each_entry(ti, &timer->active_list_head, active_list) { |
907 | if (ti->ccallback) |
908 | ti->ccallback(ti, event, tstamp, resolution); |
909 | list_for_each_entry(ts, &ti->slave_active_head, active_list) |
910 | if (ts->ccallback) |
911 | ts->ccallback(ts, event, tstamp, resolution); |
912 | } |
913 | spin_unlock_irqrestore(&timer->lock, flags); |
914 | } |
915 | |
916 | /* |
917 | * exported functions for global timers |
918 | */ |
919 | int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) |
920 | { |
921 | struct snd_timer_id tid; |
922 | |
923 | tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; |
924 | tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; |
925 | tid.card = -1; |
926 | tid.device = device; |
927 | tid.subdevice = 0; |
928 | return snd_timer_new(NULL, id, &tid, rtimer); |
929 | } |
930 | |
931 | int snd_timer_global_free(struct snd_timer *timer) |
932 | { |
933 | return snd_timer_free(timer); |
934 | } |
935 | |
936 | int snd_timer_global_register(struct snd_timer *timer) |
937 | { |
938 | struct snd_device dev; |
939 | |
940 | memset(&dev, 0, sizeof(dev)); |
941 | dev.device_data = timer; |
942 | return snd_timer_dev_register(&dev); |
943 | } |
944 | |
945 | /* |
946 | * System timer |
947 | */ |
948 | |
949 | struct snd_timer_system_private { |
950 | struct timer_list tlist; |
951 | unsigned long last_expires; |
952 | unsigned long last_jiffies; |
953 | unsigned long correction; |
954 | }; |
955 | |
956 | static void snd_timer_s_function(unsigned long data) |
957 | { |
958 | struct snd_timer *timer = (struct snd_timer *)data; |
959 | struct snd_timer_system_private *priv = timer->private_data; |
960 | unsigned long jiff = jiffies; |
961 | if (time_after(jiff, priv->last_expires)) |
962 | priv->correction += (long)jiff - (long)priv->last_expires; |
963 | snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); |
964 | } |
965 | |
966 | static int snd_timer_s_start(struct snd_timer * timer) |
967 | { |
968 | struct snd_timer_system_private *priv; |
969 | unsigned long njiff; |
970 | |
971 | priv = (struct snd_timer_system_private *) timer->private_data; |
972 | njiff = (priv->last_jiffies = jiffies); |
973 | if (priv->correction > timer->sticks - 1) { |
974 | priv->correction -= timer->sticks - 1; |
975 | njiff++; |
976 | } else { |
977 | njiff += timer->sticks - priv->correction; |
978 | priv->correction = 0; |
979 | } |
980 | priv->last_expires = priv->tlist.expires = njiff; |
981 | add_timer(&priv->tlist); |
982 | return 0; |
983 | } |
984 | |
985 | static int snd_timer_s_stop(struct snd_timer * timer) |
986 | { |
987 | struct snd_timer_system_private *priv; |
988 | unsigned long jiff; |
989 | |
990 | priv = (struct snd_timer_system_private *) timer->private_data; |
991 | del_timer(&priv->tlist); |
992 | jiff = jiffies; |
993 | if (time_before(jiff, priv->last_expires)) |
994 | timer->sticks = priv->last_expires - jiff; |
995 | else |
996 | timer->sticks = 1; |
997 | priv->correction = 0; |
998 | return 0; |
999 | } |
1000 | |
1001 | static struct snd_timer_hardware snd_timer_system = |
1002 | { |
1003 | .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, |
1004 | .resolution = 1000000000L / HZ, |
1005 | .ticks = 10000000L, |
1006 | .start = snd_timer_s_start, |
1007 | .stop = snd_timer_s_stop |
1008 | }; |
1009 | |
1010 | static void snd_timer_free_system(struct snd_timer *timer) |
1011 | { |
1012 | kfree(timer->private_data); |
1013 | } |
1014 | |
1015 | static int snd_timer_register_system(void) |
1016 | { |
1017 | struct snd_timer *timer; |
1018 | struct snd_timer_system_private *priv; |
1019 | int err; |
1020 | |
1021 | err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); |
1022 | if (err < 0) |
1023 | return err; |
1024 | strcpy(timer->name, "system timer"); |
1025 | timer->hw = snd_timer_system; |
1026 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
1027 | if (priv == NULL) { |
1028 | snd_timer_free(timer); |
1029 | return -ENOMEM; |
1030 | } |
1031 | init_timer(&priv->tlist); |
1032 | priv->tlist.function = snd_timer_s_function; |
1033 | priv->tlist.data = (unsigned long) timer; |
1034 | timer->private_data = priv; |
1035 | timer->private_free = snd_timer_free_system; |
1036 | return snd_timer_global_register(timer); |
1037 | } |
1038 | |
1039 | #ifdef CONFIG_PROC_FS |
1040 | /* |
1041 | * Info interface |
1042 | */ |
1043 | |
1044 | static void snd_timer_proc_read(struct snd_info_entry *entry, |
1045 | struct snd_info_buffer *buffer) |
1046 | { |
1047 | struct snd_timer *timer; |
1048 | struct snd_timer_instance *ti; |
1049 | |
1050 | mutex_lock(®ister_mutex); |
1051 | list_for_each_entry(timer, &snd_timer_list, device_list) { |
1052 | switch (timer->tmr_class) { |
1053 | case SNDRV_TIMER_CLASS_GLOBAL: |
1054 | snd_iprintf(buffer, "G%i: ", timer->tmr_device); |
1055 | break; |
1056 | case SNDRV_TIMER_CLASS_CARD: |
1057 | snd_iprintf(buffer, "C%i-%i: ", |
1058 | timer->card->number, timer->tmr_device); |
1059 | break; |
1060 | case SNDRV_TIMER_CLASS_PCM: |
1061 | snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, |
1062 | timer->tmr_device, timer->tmr_subdevice); |
1063 | break; |
1064 | default: |
1065 | snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, |
1066 | timer->card ? timer->card->number : -1, |
1067 | timer->tmr_device, timer->tmr_subdevice); |
1068 | } |
1069 | snd_iprintf(buffer, "%s :", timer->name); |
1070 | if (timer->hw.resolution) |
1071 | snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", |
1072 | timer->hw.resolution / 1000, |
1073 | timer->hw.resolution % 1000, |
1074 | timer->hw.ticks); |
1075 | if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) |
1076 | snd_iprintf(buffer, " SLAVE"); |
1077 | snd_iprintf(buffer, "\n"); |
1078 | list_for_each_entry(ti, &timer->open_list_head, open_list) |
1079 | snd_iprintf(buffer, " Client %s : %s\n", |
1080 | ti->owner ? ti->owner : "unknown", |
1081 | ti->flags & (SNDRV_TIMER_IFLG_START | |
1082 | SNDRV_TIMER_IFLG_RUNNING) |
1083 | ? "running" : "stopped"); |
1084 | } |
1085 | mutex_unlock(®ister_mutex); |
1086 | } |
1087 | |
1088 | static struct snd_info_entry *snd_timer_proc_entry; |
1089 | |
1090 | static void __init snd_timer_proc_init(void) |
1091 | { |
1092 | struct snd_info_entry *entry; |
1093 | |
1094 | entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); |
1095 | if (entry != NULL) { |
1096 | entry->c.text.read = snd_timer_proc_read; |
1097 | if (snd_info_register(entry) < 0) { |
1098 | snd_info_free_entry(entry); |
1099 | entry = NULL; |
1100 | } |
1101 | } |
1102 | snd_timer_proc_entry = entry; |
1103 | } |
1104 | |
1105 | static void __exit snd_timer_proc_done(void) |
1106 | { |
1107 | snd_info_free_entry(snd_timer_proc_entry); |
1108 | } |
1109 | #else /* !CONFIG_PROC_FS */ |
1110 | #define snd_timer_proc_init() |
1111 | #define snd_timer_proc_done() |
1112 | #endif |
1113 | |
1114 | /* |
1115 | * USER SPACE interface |
1116 | */ |
1117 | |
1118 | static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, |
1119 | unsigned long resolution, |
1120 | unsigned long ticks) |
1121 | { |
1122 | struct snd_timer_user *tu = timeri->callback_data; |
1123 | struct snd_timer_read *r; |
1124 | int prev; |
1125 | |
1126 | spin_lock(&tu->qlock); |
1127 | if (tu->qused > 0) { |
1128 | prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; |
1129 | r = &tu->queue[prev]; |
1130 | if (r->resolution == resolution) { |
1131 | r->ticks += ticks; |
1132 | goto __wake; |
1133 | } |
1134 | } |
1135 | if (tu->qused >= tu->queue_size) { |
1136 | tu->overrun++; |
1137 | } else { |
1138 | r = &tu->queue[tu->qtail++]; |
1139 | tu->qtail %= tu->queue_size; |
1140 | r->resolution = resolution; |
1141 | r->ticks = ticks; |
1142 | tu->qused++; |
1143 | } |
1144 | __wake: |
1145 | spin_unlock(&tu->qlock); |
1146 | kill_fasync(&tu->fasync, SIGIO, POLL_IN); |
1147 | wake_up(&tu->qchange_sleep); |
1148 | } |
1149 | |
1150 | static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, |
1151 | struct snd_timer_tread *tread) |
1152 | { |
1153 | if (tu->qused >= tu->queue_size) { |
1154 | tu->overrun++; |
1155 | } else { |
1156 | memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); |
1157 | tu->qtail %= tu->queue_size; |
1158 | tu->qused++; |
1159 | } |
1160 | } |
1161 | |
1162 | static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, |
1163 | int event, |
1164 | struct timespec *tstamp, |
1165 | unsigned long resolution) |
1166 | { |
1167 | struct snd_timer_user *tu = timeri->callback_data; |
1168 | struct snd_timer_tread r1; |
1169 | unsigned long flags; |
1170 | |
1171 | if (event >= SNDRV_TIMER_EVENT_START && |
1172 | event <= SNDRV_TIMER_EVENT_PAUSE) |
1173 | tu->tstamp = *tstamp; |
1174 | if ((tu->filter & (1 << event)) == 0 || !tu->tread) |
1175 | return; |
1176 | r1.event = event; |
1177 | r1.tstamp = *tstamp; |
1178 | r1.val = resolution; |
1179 | spin_lock_irqsave(&tu->qlock, flags); |
1180 | snd_timer_user_append_to_tqueue(tu, &r1); |
1181 | spin_unlock_irqrestore(&tu->qlock, flags); |
1182 | kill_fasync(&tu->fasync, SIGIO, POLL_IN); |
1183 | wake_up(&tu->qchange_sleep); |
1184 | } |
1185 | |
1186 | static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, |
1187 | unsigned long resolution, |
1188 | unsigned long ticks) |
1189 | { |
1190 | struct snd_timer_user *tu = timeri->callback_data; |
1191 | struct snd_timer_tread *r, r1; |
1192 | struct timespec tstamp; |
1193 | int prev, append = 0; |
1194 | |
1195 | memset(&tstamp, 0, sizeof(tstamp)); |
1196 | spin_lock(&tu->qlock); |
1197 | if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | |
1198 | (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { |
1199 | spin_unlock(&tu->qlock); |
1200 | return; |
1201 | } |
1202 | if (tu->last_resolution != resolution || ticks > 0) { |
1203 | if (timer_tstamp_monotonic) |
1204 | do_posix_clock_monotonic_gettime(&tstamp); |
1205 | else |
1206 | getnstimeofday(&tstamp); |
1207 | } |
1208 | if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && |
1209 | tu->last_resolution != resolution) { |
1210 | r1.event = SNDRV_TIMER_EVENT_RESOLUTION; |
1211 | r1.tstamp = tstamp; |
1212 | r1.val = resolution; |
1213 | snd_timer_user_append_to_tqueue(tu, &r1); |
1214 | tu->last_resolution = resolution; |
1215 | append++; |
1216 | } |
1217 | if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) |
1218 | goto __wake; |
1219 | if (ticks == 0) |
1220 | goto __wake; |
1221 | if (tu->qused > 0) { |
1222 | prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; |
1223 | r = &tu->tqueue[prev]; |
1224 | if (r->event == SNDRV_TIMER_EVENT_TICK) { |
1225 | r->tstamp = tstamp; |
1226 | r->val += ticks; |
1227 | append++; |
1228 | goto __wake; |
1229 | } |
1230 | } |
1231 | r1.event = SNDRV_TIMER_EVENT_TICK; |
1232 | r1.tstamp = tstamp; |
1233 | r1.val = ticks; |
1234 | snd_timer_user_append_to_tqueue(tu, &r1); |
1235 | append++; |
1236 | __wake: |
1237 | spin_unlock(&tu->qlock); |
1238 | if (append == 0) |
1239 | return; |
1240 | kill_fasync(&tu->fasync, SIGIO, POLL_IN); |
1241 | wake_up(&tu->qchange_sleep); |
1242 | } |
1243 | |
1244 | static int snd_timer_user_open(struct inode *inode, struct file *file) |
1245 | { |
1246 | struct snd_timer_user *tu; |
1247 | int err; |
1248 | |
1249 | err = nonseekable_open(inode, file); |
1250 | if (err < 0) |
1251 | return err; |
1252 | |
1253 | tu = kzalloc(sizeof(*tu), GFP_KERNEL); |
1254 | if (tu == NULL) |
1255 | return -ENOMEM; |
1256 | spin_lock_init(&tu->qlock); |
1257 | init_waitqueue_head(&tu->qchange_sleep); |
1258 | mutex_init(&tu->tread_sem); |
1259 | tu->ticks = 1; |
1260 | tu->queue_size = 128; |
1261 | tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), |
1262 | GFP_KERNEL); |
1263 | if (tu->queue == NULL) { |
1264 | kfree(tu); |
1265 | return -ENOMEM; |
1266 | } |
1267 | file->private_data = tu; |
1268 | return 0; |
1269 | } |
1270 | |
1271 | static int snd_timer_user_release(struct inode *inode, struct file *file) |
1272 | { |
1273 | struct snd_timer_user *tu; |
1274 | |
1275 | if (file->private_data) { |
1276 | tu = file->private_data; |
1277 | file->private_data = NULL; |
1278 | if (tu->timeri) |
1279 | snd_timer_close(tu->timeri); |
1280 | kfree(tu->queue); |
1281 | kfree(tu->tqueue); |
1282 | kfree(tu); |
1283 | } |
1284 | return 0; |
1285 | } |
1286 | |
1287 | static void snd_timer_user_zero_id(struct snd_timer_id *id) |
1288 | { |
1289 | id->dev_class = SNDRV_TIMER_CLASS_NONE; |
1290 | id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; |
1291 | id->card = -1; |
1292 | id->device = -1; |
1293 | id->subdevice = -1; |
1294 | } |
1295 | |
1296 | static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) |
1297 | { |
1298 | id->dev_class = timer->tmr_class; |
1299 | id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; |
1300 | id->card = timer->card ? timer->card->number : -1; |
1301 | id->device = timer->tmr_device; |
1302 | id->subdevice = timer->tmr_subdevice; |
1303 | } |
1304 | |
1305 | static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) |
1306 | { |
1307 | struct snd_timer_id id; |
1308 | struct snd_timer *timer; |
1309 | struct list_head *p; |
1310 | |
1311 | if (copy_from_user(&id, _tid, sizeof(id))) |
1312 | return -EFAULT; |
1313 | mutex_lock(®ister_mutex); |
1314 | if (id.dev_class < 0) { /* first item */ |
1315 | if (list_empty(&snd_timer_list)) |
1316 | snd_timer_user_zero_id(&id); |
1317 | else { |
1318 | timer = list_entry(snd_timer_list.next, |
1319 | struct snd_timer, device_list); |
1320 | snd_timer_user_copy_id(&id, timer); |
1321 | } |
1322 | } else { |
1323 | switch (id.dev_class) { |
1324 | case SNDRV_TIMER_CLASS_GLOBAL: |
1325 | id.device = id.device < 0 ? 0 : id.device + 1; |
1326 | list_for_each(p, &snd_timer_list) { |
1327 | timer = list_entry(p, struct snd_timer, device_list); |
1328 | if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { |
1329 | snd_timer_user_copy_id(&id, timer); |
1330 | break; |
1331 | } |
1332 | if (timer->tmr_device >= id.device) { |
1333 | snd_timer_user_copy_id(&id, timer); |
1334 | break; |
1335 | } |
1336 | } |
1337 | if (p == &snd_timer_list) |
1338 | snd_timer_user_zero_id(&id); |
1339 | break; |
1340 | case SNDRV_TIMER_CLASS_CARD: |
1341 | case SNDRV_TIMER_CLASS_PCM: |
1342 | if (id.card < 0) { |
1343 | id.card = 0; |
1344 | } else { |
1345 | if (id.card < 0) { |
1346 | id.card = 0; |
1347 | } else { |
1348 | if (id.device < 0) { |
1349 | id.device = 0; |
1350 | } else { |
1351 | if (id.subdevice < 0) { |
1352 | id.subdevice = 0; |
1353 | } else { |
1354 | id.subdevice++; |
1355 | } |
1356 | } |
1357 | } |
1358 | } |
1359 | list_for_each(p, &snd_timer_list) { |
1360 | timer = list_entry(p, struct snd_timer, device_list); |
1361 | if (timer->tmr_class > id.dev_class) { |
1362 | snd_timer_user_copy_id(&id, timer); |
1363 | break; |
1364 | } |
1365 | if (timer->tmr_class < id.dev_class) |
1366 | continue; |
1367 | if (timer->card->number > id.card) { |
1368 | snd_timer_user_copy_id(&id, timer); |
1369 | break; |
1370 | } |
1371 | if (timer->card->number < id.card) |
1372 | continue; |
1373 | if (timer->tmr_device > id.device) { |
1374 | snd_timer_user_copy_id(&id, timer); |
1375 | break; |
1376 | } |
1377 | if (timer->tmr_device < id.device) |
1378 | continue; |
1379 | if (timer->tmr_subdevice > id.subdevice) { |
1380 | snd_timer_user_copy_id(&id, timer); |
1381 | break; |
1382 | } |
1383 | if (timer->tmr_subdevice < id.subdevice) |
1384 | continue; |
1385 | snd_timer_user_copy_id(&id, timer); |
1386 | break; |
1387 | } |
1388 | if (p == &snd_timer_list) |
1389 | snd_timer_user_zero_id(&id); |
1390 | break; |
1391 | default: |
1392 | snd_timer_user_zero_id(&id); |
1393 | } |
1394 | } |
1395 | mutex_unlock(®ister_mutex); |
1396 | if (copy_to_user(_tid, &id, sizeof(*_tid))) |
1397 | return -EFAULT; |
1398 | return 0; |
1399 | } |
1400 | |
1401 | static int snd_timer_user_ginfo(struct file *file, |
1402 | struct snd_timer_ginfo __user *_ginfo) |
1403 | { |
1404 | struct snd_timer_ginfo *ginfo; |
1405 | struct snd_timer_id tid; |
1406 | struct snd_timer *t; |
1407 | struct list_head *p; |
1408 | int err = 0; |
1409 | |
1410 | ginfo = memdup_user(_ginfo, sizeof(*ginfo)); |
1411 | if (IS_ERR(ginfo)) |
1412 | return PTR_ERR(ginfo); |
1413 | |
1414 | tid = ginfo->tid; |
1415 | memset(ginfo, 0, sizeof(*ginfo)); |
1416 | ginfo->tid = tid; |
1417 | mutex_lock(®ister_mutex); |
1418 | t = snd_timer_find(&tid); |
1419 | if (t != NULL) { |
1420 | ginfo->card = t->card ? t->card->number : -1; |
1421 | if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) |
1422 | ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; |
1423 | strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); |
1424 | strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); |
1425 | ginfo->resolution = t->hw.resolution; |
1426 | if (t->hw.resolution_min > 0) { |
1427 | ginfo->resolution_min = t->hw.resolution_min; |
1428 | ginfo->resolution_max = t->hw.resolution_max; |
1429 | } |
1430 | list_for_each(p, &t->open_list_head) { |
1431 | ginfo->clients++; |
1432 | } |
1433 | } else { |
1434 | err = -ENODEV; |
1435 | } |
1436 | mutex_unlock(®ister_mutex); |
1437 | if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) |
1438 | err = -EFAULT; |
1439 | kfree(ginfo); |
1440 | return err; |
1441 | } |
1442 | |
1443 | static int snd_timer_user_gparams(struct file *file, |
1444 | struct snd_timer_gparams __user *_gparams) |
1445 | { |
1446 | struct snd_timer_gparams gparams; |
1447 | struct snd_timer *t; |
1448 | int err; |
1449 | |
1450 | if (copy_from_user(&gparams, _gparams, sizeof(gparams))) |
1451 | return -EFAULT; |
1452 | mutex_lock(®ister_mutex); |
1453 | t = snd_timer_find(&gparams.tid); |
1454 | if (!t) { |
1455 | err = -ENODEV; |
1456 | goto _error; |
1457 | } |
1458 | if (!list_empty(&t->open_list_head)) { |
1459 | err = -EBUSY; |
1460 | goto _error; |
1461 | } |
1462 | if (!t->hw.set_period) { |
1463 | err = -ENOSYS; |
1464 | goto _error; |
1465 | } |
1466 | err = t->hw.set_period(t, gparams.period_num, gparams.period_den); |
1467 | _error: |
1468 | mutex_unlock(®ister_mutex); |
1469 | return err; |
1470 | } |
1471 | |
1472 | static int snd_timer_user_gstatus(struct file *file, |
1473 | struct snd_timer_gstatus __user *_gstatus) |
1474 | { |
1475 | struct snd_timer_gstatus gstatus; |
1476 | struct snd_timer_id tid; |
1477 | struct snd_timer *t; |
1478 | int err = 0; |
1479 | |
1480 | if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) |
1481 | return -EFAULT; |
1482 | tid = gstatus.tid; |
1483 | memset(&gstatus, 0, sizeof(gstatus)); |
1484 | gstatus.tid = tid; |
1485 | mutex_lock(®ister_mutex); |
1486 | t = snd_timer_find(&tid); |
1487 | if (t != NULL) { |
1488 | if (t->hw.c_resolution) |
1489 | gstatus.resolution = t->hw.c_resolution(t); |
1490 | else |
1491 | gstatus.resolution = t->hw.resolution; |
1492 | if (t->hw.precise_resolution) { |
1493 | t->hw.precise_resolution(t, &gstatus.resolution_num, |
1494 | &gstatus.resolution_den); |
1495 | } else { |
1496 | gstatus.resolution_num = gstatus.resolution; |
1497 | gstatus.resolution_den = 1000000000uL; |
1498 | } |
1499 | } else { |
1500 | err = -ENODEV; |
1501 | } |
1502 | mutex_unlock(®ister_mutex); |
1503 | if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) |
1504 | err = -EFAULT; |
1505 | return err; |
1506 | } |
1507 | |
1508 | static int snd_timer_user_tselect(struct file *file, |
1509 | struct snd_timer_select __user *_tselect) |
1510 | { |
1511 | struct snd_timer_user *tu; |
1512 | struct snd_timer_select tselect; |
1513 | char str[32]; |
1514 | int err = 0; |
1515 | |
1516 | tu = file->private_data; |
1517 | mutex_lock(&tu->tread_sem); |
1518 | if (tu->timeri) { |
1519 | snd_timer_close(tu->timeri); |
1520 | tu->timeri = NULL; |
1521 | } |
1522 | if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { |
1523 | err = -EFAULT; |
1524 | goto __err; |
1525 | } |
1526 | sprintf(str, "application %i", current->pid); |
1527 | if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) |
1528 | tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; |
1529 | err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); |
1530 | if (err < 0) |
1531 | goto __err; |
1532 | |
1533 | kfree(tu->queue); |
1534 | tu->queue = NULL; |
1535 | kfree(tu->tqueue); |
1536 | tu->tqueue = NULL; |
1537 | if (tu->tread) { |
1538 | tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), |
1539 | GFP_KERNEL); |
1540 | if (tu->tqueue == NULL) |
1541 | err = -ENOMEM; |
1542 | } else { |
1543 | tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), |
1544 | GFP_KERNEL); |
1545 | if (tu->queue == NULL) |
1546 | err = -ENOMEM; |
1547 | } |
1548 | |
1549 | if (err < 0) { |
1550 | snd_timer_close(tu->timeri); |
1551 | tu->timeri = NULL; |
1552 | } else { |
1553 | tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; |
1554 | tu->timeri->callback = tu->tread |
1555 | ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; |
1556 | tu->timeri->ccallback = snd_timer_user_ccallback; |
1557 | tu->timeri->callback_data = (void *)tu; |
1558 | } |
1559 | |
1560 | __err: |
1561 | mutex_unlock(&tu->tread_sem); |
1562 | return err; |
1563 | } |
1564 | |
1565 | static int snd_timer_user_info(struct file *file, |
1566 | struct snd_timer_info __user *_info) |
1567 | { |
1568 | struct snd_timer_user *tu; |
1569 | struct snd_timer_info *info; |
1570 | struct snd_timer *t; |
1571 | int err = 0; |
1572 | |
1573 | tu = file->private_data; |
1574 | if (!tu->timeri) |
1575 | return -EBADFD; |
1576 | t = tu->timeri->timer; |
1577 | if (!t) |
1578 | return -EBADFD; |
1579 | |
1580 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1581 | if (! info) |
1582 | return -ENOMEM; |
1583 | info->card = t->card ? t->card->number : -1; |
1584 | if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) |
1585 | info->flags |= SNDRV_TIMER_FLG_SLAVE; |
1586 | strlcpy(info->id, t->id, sizeof(info->id)); |
1587 | strlcpy(info->name, t->name, sizeof(info->name)); |
1588 | info->resolution = t->hw.resolution; |
1589 | if (copy_to_user(_info, info, sizeof(*_info))) |
1590 | err = -EFAULT; |
1591 | kfree(info); |
1592 | return err; |
1593 | } |
1594 | |
1595 | static int snd_timer_user_params(struct file *file, |
1596 | struct snd_timer_params __user *_params) |
1597 | { |
1598 | struct snd_timer_user *tu; |
1599 | struct snd_timer_params params; |
1600 | struct snd_timer *t; |
1601 | struct snd_timer_read *tr; |
1602 | struct snd_timer_tread *ttr; |
1603 | int err; |
1604 | |
1605 | tu = file->private_data; |
1606 | if (!tu->timeri) |
1607 | return -EBADFD; |
1608 | t = tu->timeri->timer; |
1609 | if (!t) |
1610 | return -EBADFD; |
1611 | if (copy_from_user(¶ms, _params, sizeof(params))) |
1612 | return -EFAULT; |
1613 | if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { |
1614 | err = -EINVAL; |
1615 | goto _end; |
1616 | } |
1617 | if (params.queue_size > 0 && |
1618 | (params.queue_size < 32 || params.queue_size > 1024)) { |
1619 | err = -EINVAL; |
1620 | goto _end; |
1621 | } |
1622 | if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| |
1623 | (1<<SNDRV_TIMER_EVENT_TICK)| |
1624 | (1<<SNDRV_TIMER_EVENT_START)| |
1625 | (1<<SNDRV_TIMER_EVENT_STOP)| |
1626 | (1<<SNDRV_TIMER_EVENT_CONTINUE)| |
1627 | (1<<SNDRV_TIMER_EVENT_PAUSE)| |
1628 | (1<<SNDRV_TIMER_EVENT_SUSPEND)| |
1629 | (1<<SNDRV_TIMER_EVENT_RESUME)| |
1630 | (1<<SNDRV_TIMER_EVENT_MSTART)| |
1631 | (1<<SNDRV_TIMER_EVENT_MSTOP)| |
1632 | (1<<SNDRV_TIMER_EVENT_MCONTINUE)| |
1633 | (1<<SNDRV_TIMER_EVENT_MPAUSE)| |
1634 | (1<<SNDRV_TIMER_EVENT_MSUSPEND)| |
1635 | (1<<SNDRV_TIMER_EVENT_MRESUME))) { |
1636 | err = -EINVAL; |
1637 | goto _end; |
1638 | } |
1639 | snd_timer_stop(tu->timeri); |
1640 | spin_lock_irq(&t->lock); |
1641 | tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| |
1642 | SNDRV_TIMER_IFLG_EXCLUSIVE| |
1643 | SNDRV_TIMER_IFLG_EARLY_EVENT); |
1644 | if (params.flags & SNDRV_TIMER_PSFLG_AUTO) |
1645 | tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; |
1646 | if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) |
1647 | tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; |
1648 | if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) |
1649 | tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; |
1650 | spin_unlock_irq(&t->lock); |
1651 | if (params.queue_size > 0 && |
1652 | (unsigned int)tu->queue_size != params.queue_size) { |
1653 | if (tu->tread) { |
1654 | ttr = kmalloc(params.queue_size * sizeof(*ttr), |
1655 | GFP_KERNEL); |
1656 | if (ttr) { |
1657 | kfree(tu->tqueue); |
1658 | tu->queue_size = params.queue_size; |
1659 | tu->tqueue = ttr; |
1660 | } |
1661 | } else { |
1662 | tr = kmalloc(params.queue_size * sizeof(*tr), |
1663 | GFP_KERNEL); |
1664 | if (tr) { |
1665 | kfree(tu->queue); |
1666 | tu->queue_size = params.queue_size; |
1667 | tu->queue = tr; |
1668 | } |
1669 | } |
1670 | } |
1671 | tu->qhead = tu->qtail = tu->qused = 0; |
1672 | if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { |
1673 | if (tu->tread) { |
1674 | struct snd_timer_tread tread; |
1675 | tread.event = SNDRV_TIMER_EVENT_EARLY; |
1676 | tread.tstamp.tv_sec = 0; |
1677 | tread.tstamp.tv_nsec = 0; |
1678 | tread.val = 0; |
1679 | snd_timer_user_append_to_tqueue(tu, &tread); |
1680 | } else { |
1681 | struct snd_timer_read *r = &tu->queue[0]; |
1682 | r->resolution = 0; |
1683 | r->ticks = 0; |
1684 | tu->qused++; |
1685 | tu->qtail++; |
1686 | } |
1687 | } |
1688 | tu->filter = params.filter; |
1689 | tu->ticks = params.ticks; |
1690 | err = 0; |
1691 | _end: |
1692 | if (copy_to_user(_params, ¶ms, sizeof(params))) |
1693 | return -EFAULT; |
1694 | return err; |
1695 | } |
1696 | |
1697 | static int snd_timer_user_status(struct file *file, |
1698 | struct snd_timer_status __user *_status) |
1699 | { |
1700 | struct snd_timer_user *tu; |
1701 | struct snd_timer_status status; |
1702 | |
1703 | tu = file->private_data; |
1704 | if (!tu->timeri) |
1705 | return -EBADFD; |
1706 | memset(&status, 0, sizeof(status)); |
1707 | status.tstamp = tu->tstamp; |
1708 | status.resolution = snd_timer_resolution(tu->timeri); |
1709 | status.lost = tu->timeri->lost; |
1710 | status.overrun = tu->overrun; |
1711 | spin_lock_irq(&tu->qlock); |
1712 | status.queue = tu->qused; |
1713 | spin_unlock_irq(&tu->qlock); |
1714 | if (copy_to_user(_status, &status, sizeof(status))) |
1715 | return -EFAULT; |
1716 | return 0; |
1717 | } |
1718 | |
1719 | static int snd_timer_user_start(struct file *file) |
1720 | { |
1721 | int err; |
1722 | struct snd_timer_user *tu; |
1723 | |
1724 | tu = file->private_data; |
1725 | if (!tu->timeri) |
1726 | return -EBADFD; |
1727 | snd_timer_stop(tu->timeri); |
1728 | tu->timeri->lost = 0; |
1729 | tu->last_resolution = 0; |
1730 | return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; |
1731 | } |
1732 | |
1733 | static int snd_timer_user_stop(struct file *file) |
1734 | { |
1735 | int err; |
1736 | struct snd_timer_user *tu; |
1737 | |
1738 | tu = file->private_data; |
1739 | if (!tu->timeri) |
1740 | return -EBADFD; |
1741 | return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; |
1742 | } |
1743 | |
1744 | static int snd_timer_user_continue(struct file *file) |
1745 | { |
1746 | int err; |
1747 | struct snd_timer_user *tu; |
1748 | |
1749 | tu = file->private_data; |
1750 | if (!tu->timeri) |
1751 | return -EBADFD; |
1752 | tu->timeri->lost = 0; |
1753 | return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; |
1754 | } |
1755 | |
1756 | static int snd_timer_user_pause(struct file *file) |
1757 | { |
1758 | int err; |
1759 | struct snd_timer_user *tu; |
1760 | |
1761 | tu = file->private_data; |
1762 | if (!tu->timeri) |
1763 | return -EBADFD; |
1764 | return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; |
1765 | } |
1766 | |
1767 | enum { |
1768 | SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), |
1769 | SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), |
1770 | SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), |
1771 | SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), |
1772 | }; |
1773 | |
1774 | static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, |
1775 | unsigned long arg) |
1776 | { |
1777 | struct snd_timer_user *tu; |
1778 | void __user *argp = (void __user *)arg; |
1779 | int __user *p = argp; |
1780 | |
1781 | tu = file->private_data; |
1782 | switch (cmd) { |
1783 | case SNDRV_TIMER_IOCTL_PVERSION: |
1784 | return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; |
1785 | case SNDRV_TIMER_IOCTL_NEXT_DEVICE: |
1786 | return snd_timer_user_next_device(argp); |
1787 | case SNDRV_TIMER_IOCTL_TREAD: |
1788 | { |
1789 | int xarg; |
1790 | |
1791 | mutex_lock(&tu->tread_sem); |
1792 | if (tu->timeri) { /* too late */ |
1793 | mutex_unlock(&tu->tread_sem); |
1794 | return -EBUSY; |
1795 | } |
1796 | if (get_user(xarg, p)) { |
1797 | mutex_unlock(&tu->tread_sem); |
1798 | return -EFAULT; |
1799 | } |
1800 | tu->tread = xarg ? 1 : 0; |
1801 | mutex_unlock(&tu->tread_sem); |
1802 | return 0; |
1803 | } |
1804 | case SNDRV_TIMER_IOCTL_GINFO: |
1805 | return snd_timer_user_ginfo(file, argp); |
1806 | case SNDRV_TIMER_IOCTL_GPARAMS: |
1807 | return snd_timer_user_gparams(file, argp); |
1808 | case SNDRV_TIMER_IOCTL_GSTATUS: |
1809 | return snd_timer_user_gstatus(file, argp); |
1810 | case SNDRV_TIMER_IOCTL_SELECT: |
1811 | return snd_timer_user_tselect(file, argp); |
1812 | case SNDRV_TIMER_IOCTL_INFO: |
1813 | return snd_timer_user_info(file, argp); |
1814 | case SNDRV_TIMER_IOCTL_PARAMS: |
1815 | return snd_timer_user_params(file, argp); |
1816 | case SNDRV_TIMER_IOCTL_STATUS: |
1817 | return snd_timer_user_status(file, argp); |
1818 | case SNDRV_TIMER_IOCTL_START: |
1819 | case SNDRV_TIMER_IOCTL_START_OLD: |
1820 | return snd_timer_user_start(file); |
1821 | case SNDRV_TIMER_IOCTL_STOP: |
1822 | case SNDRV_TIMER_IOCTL_STOP_OLD: |
1823 | return snd_timer_user_stop(file); |
1824 | case SNDRV_TIMER_IOCTL_CONTINUE: |
1825 | case SNDRV_TIMER_IOCTL_CONTINUE_OLD: |
1826 | return snd_timer_user_continue(file); |
1827 | case SNDRV_TIMER_IOCTL_PAUSE: |
1828 | case SNDRV_TIMER_IOCTL_PAUSE_OLD: |
1829 | return snd_timer_user_pause(file); |
1830 | } |
1831 | return -ENOTTY; |
1832 | } |
1833 | |
1834 | static int snd_timer_user_fasync(int fd, struct file * file, int on) |
1835 | { |
1836 | struct snd_timer_user *tu; |
1837 | |
1838 | tu = file->private_data; |
1839 | return fasync_helper(fd, file, on, &tu->fasync); |
1840 | } |
1841 | |
1842 | static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, |
1843 | size_t count, loff_t *offset) |
1844 | { |
1845 | struct snd_timer_user *tu; |
1846 | long result = 0, unit; |
1847 | int err = 0; |
1848 | |
1849 | tu = file->private_data; |
1850 | unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); |
1851 | spin_lock_irq(&tu->qlock); |
1852 | while ((long)count - result >= unit) { |
1853 | while (!tu->qused) { |
1854 | wait_queue_t wait; |
1855 | |
1856 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { |
1857 | err = -EAGAIN; |
1858 | break; |
1859 | } |
1860 | |
1861 | set_current_state(TASK_INTERRUPTIBLE); |
1862 | init_waitqueue_entry(&wait, current); |
1863 | add_wait_queue(&tu->qchange_sleep, &wait); |
1864 | |
1865 | spin_unlock_irq(&tu->qlock); |
1866 | schedule(); |
1867 | spin_lock_irq(&tu->qlock); |
1868 | |
1869 | remove_wait_queue(&tu->qchange_sleep, &wait); |
1870 | |
1871 | if (signal_pending(current)) { |
1872 | err = -ERESTARTSYS; |
1873 | break; |
1874 | } |
1875 | } |
1876 | |
1877 | spin_unlock_irq(&tu->qlock); |
1878 | if (err < 0) |
1879 | goto _error; |
1880 | |
1881 | if (tu->tread) { |
1882 | if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], |
1883 | sizeof(struct snd_timer_tread))) { |
1884 | err = -EFAULT; |
1885 | goto _error; |
1886 | } |
1887 | } else { |
1888 | if (copy_to_user(buffer, &tu->queue[tu->qhead++], |
1889 | sizeof(struct snd_timer_read))) { |
1890 | err = -EFAULT; |
1891 | goto _error; |
1892 | } |
1893 | } |
1894 | |
1895 | tu->qhead %= tu->queue_size; |
1896 | |
1897 | result += unit; |
1898 | buffer += unit; |
1899 | |
1900 | spin_lock_irq(&tu->qlock); |
1901 | tu->qused--; |
1902 | } |
1903 | spin_unlock_irq(&tu->qlock); |
1904 | _error: |
1905 | return result > 0 ? result : err; |
1906 | } |
1907 | |
1908 | static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) |
1909 | { |
1910 | unsigned int mask; |
1911 | struct snd_timer_user *tu; |
1912 | |
1913 | tu = file->private_data; |
1914 | |
1915 | poll_wait(file, &tu->qchange_sleep, wait); |
1916 | |
1917 | mask = 0; |
1918 | if (tu->qused) |
1919 | mask |= POLLIN | POLLRDNORM; |
1920 | |
1921 | return mask; |
1922 | } |
1923 | |
1924 | #ifdef CONFIG_COMPAT |
1925 | #include "timer_compat.c" |
1926 | #else |
1927 | #define snd_timer_user_ioctl_compat NULL |
1928 | #endif |
1929 | |
1930 | static const struct file_operations snd_timer_f_ops = |
1931 | { |
1932 | .owner = THIS_MODULE, |
1933 | .read = snd_timer_user_read, |
1934 | .open = snd_timer_user_open, |
1935 | .release = snd_timer_user_release, |
1936 | .llseek = no_llseek, |
1937 | .poll = snd_timer_user_poll, |
1938 | .unlocked_ioctl = snd_timer_user_ioctl, |
1939 | .compat_ioctl = snd_timer_user_ioctl_compat, |
1940 | .fasync = snd_timer_user_fasync, |
1941 | }; |
1942 | |
1943 | /* |
1944 | * ENTRY functions |
1945 | */ |
1946 | |
1947 | static int __init alsa_timer_init(void) |
1948 | { |
1949 | int err; |
1950 | |
1951 | #ifdef SNDRV_OSS_INFO_DEV_TIMERS |
1952 | snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, |
1953 | "system timer"); |
1954 | #endif |
1955 | |
1956 | if ((err = snd_timer_register_system()) < 0) |
1957 | snd_printk(KERN_ERR "unable to register system timer (%i)\n", |
1958 | err); |
1959 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, |
1960 | &snd_timer_f_ops, NULL, "timer")) < 0) |
1961 | snd_printk(KERN_ERR "unable to register timer device (%i)\n", |
1962 | err); |
1963 | snd_timer_proc_init(); |
1964 | return 0; |
1965 | } |
1966 | |
1967 | static void __exit alsa_timer_exit(void) |
1968 | { |
1969 | struct list_head *p, *n; |
1970 | |
1971 | snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); |
1972 | /* unregister the system timer */ |
1973 | list_for_each_safe(p, n, &snd_timer_list) { |
1974 | struct snd_timer *timer = list_entry(p, struct snd_timer, device_list); |
1975 | snd_timer_free(timer); |
1976 | } |
1977 | snd_timer_proc_done(); |
1978 | #ifdef SNDRV_OSS_INFO_DEV_TIMERS |
1979 | snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); |
1980 | #endif |
1981 | } |
1982 | |
1983 | module_init(alsa_timer_init) |
1984 | module_exit(alsa_timer_exit) |
1985 | |
1986 | EXPORT_SYMBOL(snd_timer_open); |
1987 | EXPORT_SYMBOL(snd_timer_close); |
1988 | EXPORT_SYMBOL(snd_timer_resolution); |
1989 | EXPORT_SYMBOL(snd_timer_start); |
1990 | EXPORT_SYMBOL(snd_timer_stop); |
1991 | EXPORT_SYMBOL(snd_timer_continue); |
1992 | EXPORT_SYMBOL(snd_timer_pause); |
1993 | EXPORT_SYMBOL(snd_timer_new); |
1994 | EXPORT_SYMBOL(snd_timer_notify); |
1995 | EXPORT_SYMBOL(snd_timer_global_new); |
1996 | EXPORT_SYMBOL(snd_timer_global_free); |
1997 | EXPORT_SYMBOL(snd_timer_global_register); |
1998 | EXPORT_SYMBOL(snd_timer_interrupt); |
1999 |
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