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