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1da177e4 LT |
1 | /* |
2 | * Timers abstract layer | |
3 | * Copyright (c) by Jaroslav Kysela <perex@suse.cz> | |
4 | * | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <sound/driver.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/smp_lock.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/time.h> | |
28 | #include <linux/moduleparam.h> | |
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 | #ifdef CONFIG_KERNELD | |
37 | #include <linux/kerneld.h> | |
38 | #endif | |
39 | ||
40 | #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE) | |
41 | #define DEFAULT_TIMER_LIMIT 3 | |
42 | #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE) | |
43 | #define DEFAULT_TIMER_LIMIT 2 | |
44 | #else | |
45 | #define DEFAULT_TIMER_LIMIT 1 | |
46 | #endif | |
47 | ||
48 | static int timer_limit = DEFAULT_TIMER_LIMIT; | |
49 | MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>"); | |
50 | MODULE_DESCRIPTION("ALSA timer interface"); | |
51 | MODULE_LICENSE("GPL"); | |
52 | module_param(timer_limit, int, 0444); | |
53 | MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); | |
54 | ||
55 | typedef struct { | |
56 | snd_timer_instance_t *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 | snd_timer_read_t *queue; | |
65 | snd_timer_tread_t *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 | } snd_timer_user_t; | |
73 | ||
74 | /* list of timers */ | |
75 | static LIST_HEAD(snd_timer_list); | |
76 | ||
77 | /* list of slave instances */ | |
78 | static LIST_HEAD(snd_timer_slave_list); | |
79 | ||
80 | /* lock for slave active lists */ | |
81 | static DEFINE_SPINLOCK(slave_active_lock); | |
82 | ||
83 | static DECLARE_MUTEX(register_mutex); | |
84 | ||
85 | static int snd_timer_free(snd_timer_t *timer); | |
86 | static int snd_timer_dev_free(snd_device_t *device); | |
87 | static int snd_timer_dev_register(snd_device_t *device); | |
88 | static int snd_timer_dev_unregister(snd_device_t *device); | |
89 | ||
90 | static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left); | |
91 | ||
92 | /* | |
93 | * create a timer instance with the given owner string. | |
94 | * when timer is not NULL, increments the module counter | |
95 | */ | |
96 | static snd_timer_instance_t *snd_timer_instance_new(char *owner, snd_timer_t *timer) | |
97 | { | |
98 | snd_timer_instance_t *timeri; | |
99 | timeri = kcalloc(1, sizeof(*timeri), GFP_KERNEL); | |
100 | if (timeri == NULL) | |
101 | return NULL; | |
102 | timeri->owner = snd_kmalloc_strdup(owner, GFP_KERNEL); | |
103 | if (! timeri->owner) { | |
104 | kfree(timeri); | |
105 | return NULL; | |
106 | } | |
107 | INIT_LIST_HEAD(&timeri->open_list); | |
108 | INIT_LIST_HEAD(&timeri->active_list); | |
109 | INIT_LIST_HEAD(&timeri->ack_list); | |
110 | INIT_LIST_HEAD(&timeri->slave_list_head); | |
111 | INIT_LIST_HEAD(&timeri->slave_active_head); | |
112 | ||
113 | timeri->timer = timer; | |
114 | if (timer && timer->card && !try_module_get(timer->card->module)) { | |
115 | kfree(timeri->owner); | |
116 | kfree(timeri); | |
117 | return NULL; | |
118 | } | |
119 | ||
120 | return timeri; | |
121 | } | |
122 | ||
123 | /* | |
124 | * find a timer instance from the given timer id | |
125 | */ | |
126 | static snd_timer_t *snd_timer_find(snd_timer_id_t *tid) | |
127 | { | |
128 | snd_timer_t *timer = NULL; | |
129 | struct list_head *p; | |
130 | ||
131 | list_for_each(p, &snd_timer_list) { | |
132 | timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); | |
133 | ||
134 | if (timer->tmr_class != tid->dev_class) | |
135 | continue; | |
136 | if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || | |
137 | timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && | |
138 | (timer->card == NULL || | |
139 | timer->card->number != tid->card)) | |
140 | continue; | |
141 | if (timer->tmr_device != tid->device) | |
142 | continue; | |
143 | if (timer->tmr_subdevice != tid->subdevice) | |
144 | continue; | |
145 | return timer; | |
146 | } | |
147 | return NULL; | |
148 | } | |
149 | ||
150 | #ifdef CONFIG_KMOD | |
151 | ||
152 | static void snd_timer_request(snd_timer_id_t *tid) | |
153 | { | |
154 | if (! current->fs->root) | |
155 | return; | |
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(snd_timer_instance_t *slave) | |
180 | { | |
181 | snd_timer_t *timer; | |
182 | snd_timer_instance_t *master; | |
183 | struct list_head *p, *q; | |
184 | ||
185 | /* FIXME: it's really dumb to look up all entries.. */ | |
186 | list_for_each(p, &snd_timer_list) { | |
187 | timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); | |
188 | list_for_each(q, &timer->open_list_head) { | |
189 | master = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list); | |
190 | if (slave->slave_class == master->slave_class && | |
191 | slave->slave_id == master->slave_id) { | |
192 | list_del(&slave->open_list); | |
193 | list_add_tail(&slave->open_list, &master->slave_list_head); | |
194 | spin_lock_irq(&slave_active_lock); | |
195 | slave->master = master; | |
196 | slave->timer = master->timer; | |
197 | spin_unlock_irq(&slave_active_lock); | |
198 | return; | |
199 | } | |
200 | } | |
201 | } | |
202 | } | |
203 | ||
204 | /* | |
205 | * look for slave instances matching with the slave id of the given master. | |
206 | * when found, relink the open_link of slaves. | |
207 | * | |
208 | * call this with register_mutex down. | |
209 | */ | |
210 | static void snd_timer_check_master(snd_timer_instance_t *master) | |
211 | { | |
212 | snd_timer_instance_t *slave; | |
213 | struct list_head *p, *n; | |
214 | ||
215 | /* check all pending slaves */ | |
216 | list_for_each_safe(p, n, &snd_timer_slave_list) { | |
217 | slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list); | |
218 | if (slave->slave_class == master->slave_class && | |
219 | slave->slave_id == master->slave_id) { | |
220 | list_del(p); | |
221 | list_add_tail(p, &master->slave_list_head); | |
222 | spin_lock_irq(&slave_active_lock); | |
223 | slave->master = master; | |
224 | slave->timer = master->timer; | |
225 | if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) | |
226 | list_add_tail(&slave->active_list, &master->slave_active_head); | |
227 | spin_unlock_irq(&slave_active_lock); | |
228 | } | |
229 | } | |
230 | } | |
231 | ||
232 | /* | |
233 | * open a timer instance | |
234 | * when opening a master, the slave id must be here given. | |
235 | */ | |
236 | int snd_timer_open(snd_timer_instance_t **ti, | |
237 | char *owner, snd_timer_id_t *tid, | |
238 | unsigned int slave_id) | |
239 | { | |
240 | snd_timer_t *timer; | |
241 | snd_timer_instance_t *timeri = NULL; | |
242 | ||
243 | if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { | |
244 | /* open a slave instance */ | |
245 | if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || | |
246 | tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { | |
247 | snd_printd("invalid slave class %i\n", tid->dev_sclass); | |
248 | return -EINVAL; | |
249 | } | |
250 | down(®ister_mutex); | |
251 | timeri = snd_timer_instance_new(owner, NULL); | |
252 | timeri->slave_class = tid->dev_sclass; | |
253 | timeri->slave_id = tid->device; | |
254 | timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; | |
255 | list_add_tail(&timeri->open_list, &snd_timer_slave_list); | |
256 | snd_timer_check_slave(timeri); | |
257 | up(®ister_mutex); | |
258 | *ti = timeri; | |
259 | return 0; | |
260 | } | |
261 | ||
262 | /* open a master instance */ | |
263 | down(®ister_mutex); | |
264 | timer = snd_timer_find(tid); | |
265 | #ifdef CONFIG_KMOD | |
266 | if (timer == NULL) { | |
267 | up(®ister_mutex); | |
268 | snd_timer_request(tid); | |
269 | down(®ister_mutex); | |
270 | timer = snd_timer_find(tid); | |
271 | } | |
272 | #endif | |
273 | if (timer) { | |
274 | if (!list_empty(&timer->open_list_head)) { | |
275 | timeri = (snd_timer_instance_t *)list_entry(timer->open_list_head.next, snd_timer_instance_t, open_list); | |
276 | if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { | |
277 | up(®ister_mutex); | |
278 | return -EBUSY; | |
279 | } | |
280 | } | |
281 | timeri = snd_timer_instance_new(owner, timer); | |
282 | if (timeri) { | |
283 | timeri->slave_class = tid->dev_sclass; | |
284 | timeri->slave_id = slave_id; | |
285 | if (list_empty(&timer->open_list_head) && timer->hw.open) | |
286 | timer->hw.open(timer); | |
287 | list_add_tail(&timeri->open_list, &timer->open_list_head); | |
288 | snd_timer_check_master(timeri); | |
289 | } | |
290 | } else { | |
291 | up(®ister_mutex); | |
292 | return -ENODEV; | |
293 | } | |
294 | up(®ister_mutex); | |
295 | *ti = timeri; | |
296 | return 0; | |
297 | } | |
298 | ||
299 | static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event); | |
300 | ||
301 | /* | |
302 | * close a timer instance | |
303 | */ | |
304 | int snd_timer_close(snd_timer_instance_t * timeri) | |
305 | { | |
306 | snd_timer_t *timer = NULL; | |
307 | struct list_head *p, *n; | |
308 | snd_timer_instance_t *slave; | |
309 | ||
310 | snd_assert(timeri != NULL, 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 | down(®ister_mutex); | |
325 | list_del(&timeri->open_list); | |
326 | up(®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 | down(®ister_mutex); | |
338 | list_del(&timeri->open_list); | |
339 | if (timer && list_empty(&timer->open_list_head) && timer->hw.close) | |
340 | timer->hw.close(timer); | |
341 | /* remove slave links */ | |
342 | list_for_each_safe(p, n, &timeri->slave_list_head) { | |
343 | slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list); | |
344 | spin_lock_irq(&slave_active_lock); | |
345 | _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); | |
346 | list_del(p); | |
347 | list_add_tail(p, &snd_timer_slave_list); | |
348 | slave->master = NULL; | |
349 | slave->timer = NULL; | |
350 | spin_unlock_irq(&slave_active_lock); | |
351 | } | |
352 | up(®ister_mutex); | |
353 | } | |
354 | if (timeri->private_free) | |
355 | timeri->private_free(timeri); | |
356 | kfree(timeri->owner); | |
357 | kfree(timeri); | |
358 | if (timer && timer->card) | |
359 | module_put(timer->card->module); | |
360 | return 0; | |
361 | } | |
362 | ||
363 | unsigned long snd_timer_resolution(snd_timer_instance_t * timeri) | |
364 | { | |
365 | snd_timer_t * 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(snd_timer_instance_t *ti, enum sndrv_timer_event event) | |
378 | { | |
379 | snd_timer_t *timer; | |
380 | unsigned long flags; | |
381 | unsigned long resolution = 0; | |
382 | snd_timer_instance_t *ts; | |
383 | struct list_head *n; | |
384 | struct timespec tstamp; | |
385 | ||
386 | snd_timestamp_now(&tstamp, 1); | |
387 | snd_assert(event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE, return); | |
388 | if (event == SNDRV_TIMER_EVENT_START || event == SNDRV_TIMER_EVENT_CONTINUE) | |
389 | resolution = snd_timer_resolution(ti); | |
390 | if (ti->ccallback) | |
391 | ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution); | |
392 | if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) | |
393 | return; | |
394 | timer = ti->timer; | |
395 | if (timer == NULL) | |
396 | return; | |
397 | if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) | |
398 | return; | |
399 | spin_lock_irqsave(&timer->lock, flags); | |
400 | list_for_each(n, &ti->slave_active_head) { | |
401 | ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list); | |
402 | if (ts->ccallback) | |
403 | ts->ccallback(ti, event + 100, &tstamp, resolution); | |
404 | } | |
405 | spin_unlock_irqrestore(&timer->lock, flags); | |
406 | } | |
407 | ||
408 | static int snd_timer_start1(snd_timer_t *timer, snd_timer_instance_t *timeri, unsigned long sticks) | |
409 | { | |
410 | list_del(&timeri->active_list); | |
411 | list_add_tail(&timeri->active_list, &timer->active_list_head); | |
412 | if (timer->running) { | |
413 | if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) | |
414 | goto __start_now; | |
415 | timer->flags |= SNDRV_TIMER_FLG_RESCHED; | |
416 | timeri->flags |= SNDRV_TIMER_IFLG_START; | |
417 | return 1; /* delayed start */ | |
418 | } else { | |
419 | timer->sticks = sticks; | |
420 | timer->hw.start(timer); | |
421 | __start_now: | |
422 | timer->running++; | |
423 | timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; | |
424 | return 0; | |
425 | } | |
426 | } | |
427 | ||
428 | static int snd_timer_start_slave(snd_timer_instance_t *timeri) | |
429 | { | |
430 | unsigned long flags; | |
431 | ||
432 | spin_lock_irqsave(&slave_active_lock, flags); | |
433 | timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; | |
434 | if (timeri->master) | |
435 | list_add_tail(&timeri->active_list, &timeri->master->slave_active_head); | |
436 | spin_unlock_irqrestore(&slave_active_lock, flags); | |
437 | return 1; /* delayed start */ | |
438 | } | |
439 | ||
440 | /* | |
441 | * start the timer instance | |
442 | */ | |
443 | int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks) | |
444 | { | |
445 | snd_timer_t *timer; | |
446 | int result = -EINVAL; | |
447 | unsigned long flags; | |
448 | ||
449 | if (timeri == NULL || ticks < 1) | |
450 | return -EINVAL; | |
451 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { | |
452 | result = snd_timer_start_slave(timeri); | |
453 | snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); | |
454 | return result; | |
455 | } | |
456 | timer = timeri->timer; | |
457 | if (timer == NULL) | |
458 | return -EINVAL; | |
459 | spin_lock_irqsave(&timer->lock, flags); | |
460 | timeri->ticks = timeri->cticks = ticks; | |
461 | timeri->pticks = 0; | |
462 | result = snd_timer_start1(timer, timeri, ticks); | |
463 | spin_unlock_irqrestore(&timer->lock, flags); | |
464 | snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); | |
465 | return result; | |
466 | } | |
467 | ||
468 | static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event) | |
469 | { | |
470 | snd_timer_t *timer; | |
471 | unsigned long flags; | |
472 | ||
473 | snd_assert(timeri != NULL, return -ENXIO); | |
474 | ||
475 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { | |
476 | if (!keep_flag) { | |
477 | spin_lock_irqsave(&slave_active_lock, flags); | |
478 | timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; | |
479 | spin_unlock_irqrestore(&slave_active_lock, flags); | |
480 | } | |
481 | goto __end; | |
482 | } | |
483 | timer = timeri->timer; | |
484 | if (!timer) | |
485 | return -EINVAL; | |
486 | spin_lock_irqsave(&timer->lock, flags); | |
487 | list_del_init(&timeri->ack_list); | |
488 | list_del_init(&timeri->active_list); | |
489 | if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && | |
490 | !(--timer->running)) { | |
491 | timer->hw.stop(timer); | |
492 | if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { | |
493 | timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; | |
494 | snd_timer_reschedule(timer, 0); | |
495 | if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { | |
496 | timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; | |
497 | timer->hw.start(timer); | |
498 | } | |
499 | } | |
500 | } | |
501 | if (!keep_flag) | |
502 | timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING|SNDRV_TIMER_IFLG_START); | |
503 | spin_unlock_irqrestore(&timer->lock, flags); | |
504 | __end: | |
505 | if (event != SNDRV_TIMER_EVENT_RESOLUTION) | |
506 | snd_timer_notify1(timeri, event); | |
507 | return 0; | |
508 | } | |
509 | ||
510 | /* | |
511 | * stop the timer instance. | |
512 | * | |
513 | * do not call this from the timer callback! | |
514 | */ | |
515 | int snd_timer_stop(snd_timer_instance_t * timeri) | |
516 | { | |
517 | snd_timer_t *timer; | |
518 | unsigned long flags; | |
519 | int err; | |
520 | ||
521 | err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); | |
522 | if (err < 0) | |
523 | return err; | |
524 | timer = timeri->timer; | |
525 | spin_lock_irqsave(&timer->lock, flags); | |
526 | timeri->cticks = timeri->ticks; | |
527 | timeri->pticks = 0; | |
528 | spin_unlock_irqrestore(&timer->lock, flags); | |
529 | return 0; | |
530 | } | |
531 | ||
532 | /* | |
533 | * start again.. the tick is kept. | |
534 | */ | |
535 | int snd_timer_continue(snd_timer_instance_t * timeri) | |
536 | { | |
537 | snd_timer_t *timer; | |
538 | int result = -EINVAL; | |
539 | unsigned long flags; | |
540 | ||
541 | if (timeri == NULL) | |
542 | return result; | |
543 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) | |
544 | return snd_timer_start_slave(timeri); | |
545 | timer = timeri->timer; | |
546 | if (! timer) | |
547 | return -EINVAL; | |
548 | spin_lock_irqsave(&timer->lock, flags); | |
549 | if (!timeri->cticks) | |
550 | timeri->cticks = 1; | |
551 | timeri->pticks = 0; | |
552 | result = snd_timer_start1(timer, timeri, timer->sticks); | |
553 | spin_unlock_irqrestore(&timer->lock, flags); | |
554 | snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); | |
555 | return result; | |
556 | } | |
557 | ||
558 | /* | |
559 | * pause.. remember the ticks left | |
560 | */ | |
561 | int snd_timer_pause(snd_timer_instance_t * timeri) | |
562 | { | |
563 | return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); | |
564 | } | |
565 | ||
566 | /* | |
567 | * reschedule the timer | |
568 | * | |
569 | * start pending instances and check the scheduling ticks. | |
570 | * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. | |
571 | */ | |
572 | static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left) | |
573 | { | |
574 | snd_timer_instance_t *ti; | |
575 | unsigned long ticks = ~0UL; | |
576 | struct list_head *p; | |
577 | ||
578 | list_for_each(p, &timer->active_list_head) { | |
579 | ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list); | |
580 | if (ti->flags & SNDRV_TIMER_IFLG_START) { | |
581 | ti->flags &= ~SNDRV_TIMER_IFLG_START; | |
582 | ti->flags |= SNDRV_TIMER_IFLG_RUNNING; | |
583 | timer->running++; | |
584 | } | |
585 | if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { | |
586 | if (ticks > ti->cticks) | |
587 | ticks = ti->cticks; | |
588 | } | |
589 | } | |
590 | if (ticks == ~0UL) { | |
591 | timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; | |
592 | return; | |
593 | } | |
594 | if (ticks > timer->hw.ticks) | |
595 | ticks = timer->hw.ticks; | |
596 | if (ticks_left != ticks) | |
597 | timer->flags |= SNDRV_TIMER_FLG_CHANGE; | |
598 | timer->sticks = ticks; | |
599 | } | |
600 | ||
601 | /* | |
602 | * timer tasklet | |
603 | * | |
604 | */ | |
605 | static void snd_timer_tasklet(unsigned long arg) | |
606 | { | |
607 | snd_timer_t *timer = (snd_timer_t *) arg; | |
608 | snd_timer_instance_t *ti; | |
609 | struct list_head *p; | |
610 | unsigned long resolution, ticks; | |
611 | ||
612 | spin_lock(&timer->lock); | |
613 | /* now process all callbacks */ | |
614 | while (!list_empty(&timer->sack_list_head)) { | |
615 | p = timer->sack_list_head.next; /* get first item */ | |
616 | ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list); | |
617 | ||
618 | /* remove from ack_list and make empty */ | |
619 | list_del_init(p); | |
620 | ||
621 | ticks = ti->pticks; | |
622 | ti->pticks = 0; | |
623 | resolution = ti->resolution; | |
624 | ||
625 | ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; | |
626 | spin_unlock(&timer->lock); | |
627 | if (ti->callback) | |
628 | ti->callback(ti, resolution, ticks); | |
629 | spin_lock(&timer->lock); | |
630 | ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; | |
631 | } | |
632 | spin_unlock(&timer->lock); | |
633 | } | |
634 | ||
635 | /* | |
636 | * timer interrupt | |
637 | * | |
638 | * ticks_left is usually equal to timer->sticks. | |
639 | * | |
640 | */ | |
641 | void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left) | |
642 | { | |
643 | snd_timer_instance_t *ti, *ts; | |
644 | unsigned long resolution, ticks; | |
645 | struct list_head *p, *q, *n; | |
646 | int use_tasklet = 0; | |
647 | ||
648 | if (timer == NULL) | |
649 | return; | |
650 | ||
651 | spin_lock(&timer->lock); | |
652 | ||
653 | /* remember the current resolution */ | |
654 | if (timer->hw.c_resolution) | |
655 | resolution = timer->hw.c_resolution(timer); | |
656 | else | |
657 | resolution = timer->hw.resolution; | |
658 | ||
659 | /* loop for all active instances | |
660 | * here we cannot use list_for_each because the active_list of a processed | |
661 | * instance is relinked to done_list_head before callback is called. | |
662 | */ | |
663 | list_for_each_safe(p, n, &timer->active_list_head) { | |
664 | ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list); | |
665 | if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) | |
666 | continue; | |
667 | ti->pticks += ticks_left; | |
668 | ti->resolution = resolution; | |
669 | if (ti->cticks < ticks_left) | |
670 | ti->cticks = 0; | |
671 | else | |
672 | ti->cticks -= ticks_left; | |
673 | if (ti->cticks) /* not expired */ | |
674 | continue; | |
675 | if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { | |
676 | ti->cticks = ti->ticks; | |
677 | } else { | |
678 | ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; | |
679 | if (--timer->running) | |
680 | list_del(p); | |
681 | } | |
682 | if (list_empty(&ti->ack_list)) { | |
683 | if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || | |
684 | (ti->flags & SNDRV_TIMER_IFLG_FAST)) { | |
685 | list_add_tail(&ti->ack_list, &timer->ack_list_head); | |
686 | } else { | |
687 | list_add_tail(&ti->ack_list, &timer->sack_list_head); | |
688 | } | |
689 | } | |
690 | list_for_each(q, &ti->slave_active_head) { | |
691 | ts = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, active_list); | |
692 | ts->pticks = ti->pticks; | |
693 | ts->resolution = resolution; | |
694 | if (list_empty(&ts->ack_list)) { | |
695 | if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || | |
696 | (ti->flags & SNDRV_TIMER_IFLG_FAST)) { | |
697 | list_add_tail(&ts->ack_list, &timer->ack_list_head); | |
698 | } else { | |
699 | list_add_tail(&ts->ack_list, &timer->sack_list_head); | |
700 | } | |
701 | } | |
702 | } | |
703 | } | |
704 | if (timer->flags & SNDRV_TIMER_FLG_RESCHED) | |
705 | snd_timer_reschedule(timer, ticks_left); | |
706 | if (timer->running) { | |
707 | if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { | |
708 | timer->hw.stop(timer); | |
709 | timer->flags |= SNDRV_TIMER_FLG_CHANGE; | |
710 | } | |
711 | if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || | |
712 | (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { | |
713 | /* restart timer */ | |
714 | timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; | |
715 | timer->hw.start(timer); | |
716 | } | |
717 | } else { | |
718 | timer->hw.stop(timer); | |
719 | } | |
720 | ||
721 | /* now process all fast callbacks */ | |
722 | while (!list_empty(&timer->ack_list_head)) { | |
723 | p = timer->ack_list_head.next; /* get first item */ | |
724 | ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list); | |
725 | ||
726 | /* remove from ack_list and make empty */ | |
727 | list_del_init(p); | |
728 | ||
729 | ticks = ti->pticks; | |
730 | ti->pticks = 0; | |
731 | ||
732 | ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; | |
733 | spin_unlock(&timer->lock); | |
734 | if (ti->callback) | |
735 | ti->callback(ti, resolution, ticks); | |
736 | spin_lock(&timer->lock); | |
737 | ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; | |
738 | } | |
739 | ||
740 | /* do we have any slow callbacks? */ | |
741 | use_tasklet = !list_empty(&timer->sack_list_head); | |
742 | spin_unlock(&timer->lock); | |
743 | ||
744 | if (use_tasklet) | |
745 | tasklet_hi_schedule(&timer->task_queue); | |
746 | } | |
747 | ||
748 | /* | |
749 | ||
750 | */ | |
751 | ||
752 | int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t ** rtimer) | |
753 | { | |
754 | snd_timer_t *timer; | |
755 | int err; | |
756 | static snd_device_ops_t ops = { | |
757 | .dev_free = snd_timer_dev_free, | |
758 | .dev_register = snd_timer_dev_register, | |
759 | .dev_unregister = snd_timer_dev_unregister | |
760 | }; | |
761 | ||
762 | snd_assert(tid != NULL, return -EINVAL); | |
763 | snd_assert(rtimer != NULL, return -EINVAL); | |
764 | *rtimer = NULL; | |
765 | timer = kcalloc(1, sizeof(*timer), GFP_KERNEL); | |
766 | if (timer == NULL) | |
767 | return -ENOMEM; | |
768 | timer->tmr_class = tid->dev_class; | |
769 | timer->card = card; | |
770 | timer->tmr_device = tid->device; | |
771 | timer->tmr_subdevice = tid->subdevice; | |
772 | if (id) | |
773 | strlcpy(timer->id, id, sizeof(timer->id)); | |
774 | INIT_LIST_HEAD(&timer->device_list); | |
775 | INIT_LIST_HEAD(&timer->open_list_head); | |
776 | INIT_LIST_HEAD(&timer->active_list_head); | |
777 | INIT_LIST_HEAD(&timer->ack_list_head); | |
778 | INIT_LIST_HEAD(&timer->sack_list_head); | |
779 | spin_lock_init(&timer->lock); | |
780 | tasklet_init(&timer->task_queue, snd_timer_tasklet, (unsigned long)timer); | |
781 | if (card != NULL) { | |
782 | if ((err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops)) < 0) { | |
783 | snd_timer_free(timer); | |
784 | return err; | |
785 | } | |
786 | } | |
787 | *rtimer = timer; | |
788 | return 0; | |
789 | } | |
790 | ||
791 | static int snd_timer_free(snd_timer_t *timer) | |
792 | { | |
793 | snd_assert(timer != NULL, return -ENXIO); | |
794 | if (timer->private_free) | |
795 | timer->private_free(timer); | |
796 | kfree(timer); | |
797 | return 0; | |
798 | } | |
799 | ||
800 | int snd_timer_dev_free(snd_device_t *device) | |
801 | { | |
802 | snd_timer_t *timer = device->device_data; | |
803 | return snd_timer_free(timer); | |
804 | } | |
805 | ||
806 | int snd_timer_dev_register(snd_device_t *dev) | |
807 | { | |
808 | snd_timer_t *timer = dev->device_data; | |
809 | snd_timer_t *timer1; | |
810 | struct list_head *p; | |
811 | ||
812 | snd_assert(timer != NULL && timer->hw.start != NULL && timer->hw.stop != NULL, return -ENXIO); | |
813 | if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && | |
814 | !timer->hw.resolution && timer->hw.c_resolution == NULL) | |
815 | return -EINVAL; | |
816 | ||
817 | down(®ister_mutex); | |
818 | list_for_each(p, &snd_timer_list) { | |
819 | timer1 = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); | |
820 | if (timer1->tmr_class > timer->tmr_class) | |
821 | break; | |
822 | if (timer1->tmr_class < timer->tmr_class) | |
823 | continue; | |
824 | if (timer1->card && timer->card) { | |
825 | if (timer1->card->number > timer->card->number) | |
826 | break; | |
827 | if (timer1->card->number < timer->card->number) | |
828 | continue; | |
829 | } | |
830 | if (timer1->tmr_device > timer->tmr_device) | |
831 | break; | |
832 | if (timer1->tmr_device < timer->tmr_device) | |
833 | continue; | |
834 | if (timer1->tmr_subdevice > timer->tmr_subdevice) | |
835 | break; | |
836 | if (timer1->tmr_subdevice < timer->tmr_subdevice) | |
837 | continue; | |
838 | /* conflicts.. */ | |
839 | up(®ister_mutex); | |
840 | return -EBUSY; | |
841 | } | |
842 | list_add_tail(&timer->device_list, p); | |
843 | up(®ister_mutex); | |
844 | return 0; | |
845 | } | |
846 | ||
847 | int snd_timer_unregister(snd_timer_t *timer) | |
848 | { | |
849 | struct list_head *p, *n; | |
850 | snd_timer_instance_t *ti; | |
851 | ||
852 | snd_assert(timer != NULL, return -ENXIO); | |
853 | down(®ister_mutex); | |
854 | if (! list_empty(&timer->open_list_head)) { | |
855 | snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer); | |
856 | list_for_each_safe(p, n, &timer->open_list_head) { | |
857 | list_del_init(p); | |
858 | ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list); | |
859 | ti->timer = NULL; | |
860 | } | |
861 | } | |
862 | list_del(&timer->device_list); | |
863 | up(®ister_mutex); | |
864 | return snd_timer_free(timer); | |
865 | } | |
866 | ||
867 | static int snd_timer_dev_unregister(snd_device_t *device) | |
868 | { | |
869 | snd_timer_t *timer = device->device_data; | |
870 | return snd_timer_unregister(timer); | |
871 | } | |
872 | ||
873 | void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, struct timespec *tstamp) | |
874 | { | |
875 | unsigned long flags; | |
876 | unsigned long resolution = 0; | |
877 | snd_timer_instance_t *ti, *ts; | |
878 | struct list_head *p, *n; | |
879 | ||
880 | snd_runtime_check(timer->hw.flags & SNDRV_TIMER_HW_SLAVE, return); | |
881 | snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && event <= SNDRV_TIMER_EVENT_MPAUSE, return); | |
882 | spin_lock_irqsave(&timer->lock, flags); | |
883 | if (event == SNDRV_TIMER_EVENT_MSTART || event == SNDRV_TIMER_EVENT_MCONTINUE) { | |
884 | if (timer->hw.c_resolution) | |
885 | resolution = timer->hw.c_resolution(timer); | |
886 | else | |
887 | resolution = timer->hw.resolution; | |
888 | } | |
889 | list_for_each(p, &timer->active_list_head) { | |
890 | ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list); | |
891 | if (ti->ccallback) | |
892 | ti->ccallback(ti, event, tstamp, resolution); | |
893 | list_for_each(n, &ti->slave_active_head) { | |
894 | ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list); | |
895 | if (ts->ccallback) | |
896 | ts->ccallback(ts, event, tstamp, resolution); | |
897 | } | |
898 | } | |
899 | spin_unlock_irqrestore(&timer->lock, flags); | |
900 | } | |
901 | ||
902 | /* | |
903 | * exported functions for global timers | |
904 | */ | |
905 | int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer) | |
906 | { | |
907 | snd_timer_id_t tid; | |
908 | ||
909 | tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; | |
910 | tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; | |
911 | tid.card = -1; | |
912 | tid.device = device; | |
913 | tid.subdevice = 0; | |
914 | return snd_timer_new(NULL, id, &tid, rtimer); | |
915 | } | |
916 | ||
917 | int snd_timer_global_free(snd_timer_t *timer) | |
918 | { | |
919 | return snd_timer_free(timer); | |
920 | } | |
921 | ||
922 | int snd_timer_global_register(snd_timer_t *timer) | |
923 | { | |
924 | snd_device_t dev; | |
925 | ||
926 | memset(&dev, 0, sizeof(dev)); | |
927 | dev.device_data = timer; | |
928 | return snd_timer_dev_register(&dev); | |
929 | } | |
930 | ||
931 | int snd_timer_global_unregister(snd_timer_t *timer) | |
932 | { | |
933 | return snd_timer_unregister(timer); | |
934 | } | |
935 | ||
936 | /* | |
937 | * System timer | |
938 | */ | |
939 | ||
940 | struct snd_timer_system_private { | |
941 | struct timer_list tlist; | |
942 | struct timer * timer; | |
943 | unsigned long last_expires; | |
944 | unsigned long last_jiffies; | |
945 | unsigned long correction; | |
946 | }; | |
947 | ||
948 | unsigned int snd_timer_system_resolution(void) | |
949 | { | |
950 | return 1000000000L / HZ; | |
951 | } | |
952 | ||
953 | static void snd_timer_s_function(unsigned long data) | |
954 | { | |
955 | snd_timer_t *timer = (snd_timer_t *)data; | |
956 | struct snd_timer_system_private *priv = timer->private_data; | |
957 | unsigned long jiff = jiffies; | |
958 | if (time_after(jiff, priv->last_expires)) | |
959 | priv->correction = (long)jiff - (long)priv->last_expires; | |
960 | snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); | |
961 | } | |
962 | ||
963 | static int snd_timer_s_start(snd_timer_t * timer) | |
964 | { | |
965 | struct snd_timer_system_private *priv; | |
966 | unsigned long njiff; | |
967 | ||
968 | priv = (struct snd_timer_system_private *) timer->private_data; | |
969 | njiff = (priv->last_jiffies = jiffies); | |
970 | if (priv->correction > timer->sticks - 1) { | |
971 | priv->correction -= timer->sticks - 1; | |
972 | njiff++; | |
973 | } else { | |
974 | njiff += timer->sticks - priv->correction; | |
975 | priv->correction -= timer->sticks; | |
976 | } | |
977 | priv->last_expires = priv->tlist.expires = njiff; | |
978 | add_timer(&priv->tlist); | |
979 | return 0; | |
980 | } | |
981 | ||
982 | static int snd_timer_s_stop(snd_timer_t * timer) | |
983 | { | |
984 | struct snd_timer_system_private *priv; | |
985 | unsigned long jiff; | |
986 | ||
987 | priv = (struct snd_timer_system_private *) timer->private_data; | |
988 | del_timer(&priv->tlist); | |
989 | jiff = jiffies; | |
990 | if (time_before(jiff, priv->last_expires)) | |
991 | timer->sticks = priv->last_expires - jiff; | |
992 | else | |
993 | timer->sticks = 1; | |
994 | return 0; | |
995 | } | |
996 | ||
997 | static struct _snd_timer_hardware snd_timer_system = | |
998 | { | |
999 | .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, | |
1000 | .resolution = 1000000000L / HZ, | |
1001 | .ticks = 10000000L, | |
1002 | .start = snd_timer_s_start, | |
1003 | .stop = snd_timer_s_stop | |
1004 | }; | |
1005 | ||
1006 | static void snd_timer_free_system(snd_timer_t *timer) | |
1007 | { | |
1008 | kfree(timer->private_data); | |
1009 | } | |
1010 | ||
1011 | static int snd_timer_register_system(void) | |
1012 | { | |
1013 | snd_timer_t *timer; | |
1014 | struct snd_timer_system_private *priv; | |
1015 | int err; | |
1016 | ||
1017 | if ((err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer)) < 0) | |
1018 | return err; | |
1019 | strcpy(timer->name, "system timer"); | |
1020 | timer->hw = snd_timer_system; | |
1021 | priv = kcalloc(1, sizeof(*priv), GFP_KERNEL); | |
1022 | if (priv == NULL) { | |
1023 | snd_timer_free(timer); | |
1024 | return -ENOMEM; | |
1025 | } | |
1026 | init_timer(&priv->tlist); | |
1027 | priv->tlist.function = snd_timer_s_function; | |
1028 | priv->tlist.data = (unsigned long) timer; | |
1029 | timer->private_data = priv; | |
1030 | timer->private_free = snd_timer_free_system; | |
1031 | return snd_timer_global_register(timer); | |
1032 | } | |
1033 | ||
1034 | /* | |
1035 | * Info interface | |
1036 | */ | |
1037 | ||
1038 | static void snd_timer_proc_read(snd_info_entry_t *entry, | |
1039 | snd_info_buffer_t * buffer) | |
1040 | { | |
1041 | unsigned long flags; | |
1042 | snd_timer_t *timer; | |
1043 | snd_timer_instance_t *ti; | |
1044 | struct list_head *p, *q; | |
1045 | ||
1046 | down(®ister_mutex); | |
1047 | list_for_each(p, &snd_timer_list) { | |
1048 | timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); | |
1049 | switch (timer->tmr_class) { | |
1050 | case SNDRV_TIMER_CLASS_GLOBAL: | |
1051 | snd_iprintf(buffer, "G%i: ", timer->tmr_device); | |
1052 | break; | |
1053 | case SNDRV_TIMER_CLASS_CARD: | |
1054 | snd_iprintf(buffer, "C%i-%i: ", timer->card->number, timer->tmr_device); | |
1055 | break; | |
1056 | case SNDRV_TIMER_CLASS_PCM: | |
1057 | snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, timer->tmr_device, timer->tmr_subdevice); | |
1058 | break; | |
1059 | default: | |
1060 | snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, timer->card ? timer->card->number : -1, timer->tmr_device, timer->tmr_subdevice); | |
1061 | } | |
1062 | snd_iprintf(buffer, "%s :", timer->name); | |
1063 | if (timer->hw.resolution) | |
1064 | snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", timer->hw.resolution / 1000, timer->hw.resolution % 1000, timer->hw.ticks); | |
1065 | if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) | |
1066 | snd_iprintf(buffer, " SLAVE"); | |
1067 | snd_iprintf(buffer, "\n"); | |
1068 | spin_lock_irqsave(&timer->lock, flags); | |
1069 | list_for_each(q, &timer->open_list_head) { | |
1070 | ti = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list); | |
1071 | snd_iprintf(buffer, " Client %s : %s : lost interrupts %li\n", | |
1072 | ti->owner ? ti->owner : "unknown", | |
1073 | ti->flags & (SNDRV_TIMER_IFLG_START|SNDRV_TIMER_IFLG_RUNNING) ? "running" : "stopped", | |
1074 | ti->lost); | |
1075 | } | |
1076 | spin_unlock_irqrestore(&timer->lock, flags); | |
1077 | } | |
1078 | up(®ister_mutex); | |
1079 | } | |
1080 | ||
1081 | /* | |
1082 | * USER SPACE interface | |
1083 | */ | |
1084 | ||
1085 | static void snd_timer_user_interrupt(snd_timer_instance_t *timeri, | |
1086 | unsigned long resolution, | |
1087 | unsigned long ticks) | |
1088 | { | |
1089 | snd_timer_user_t *tu = timeri->callback_data; | |
1090 | snd_timer_read_t *r; | |
1091 | int prev; | |
1092 | ||
1093 | spin_lock(&tu->qlock); | |
1094 | if (tu->qused > 0) { | |
1095 | prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; | |
1096 | r = &tu->queue[prev]; | |
1097 | if (r->resolution == resolution) { | |
1098 | r->ticks += ticks; | |
1099 | goto __wake; | |
1100 | } | |
1101 | } | |
1102 | if (tu->qused >= tu->queue_size) { | |
1103 | tu->overrun++; | |
1104 | } else { | |
1105 | r = &tu->queue[tu->qtail++]; | |
1106 | tu->qtail %= tu->queue_size; | |
1107 | r->resolution = resolution; | |
1108 | r->ticks = ticks; | |
1109 | tu->qused++; | |
1110 | } | |
1111 | __wake: | |
1112 | spin_unlock(&tu->qlock); | |
1113 | kill_fasync(&tu->fasync, SIGIO, POLL_IN); | |
1114 | wake_up(&tu->qchange_sleep); | |
1115 | } | |
1116 | ||
1117 | static void snd_timer_user_append_to_tqueue(snd_timer_user_t *tu, snd_timer_tread_t *tread) | |
1118 | { | |
1119 | if (tu->qused >= tu->queue_size) { | |
1120 | tu->overrun++; | |
1121 | } else { | |
1122 | memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); | |
1123 | tu->qtail %= tu->queue_size; | |
1124 | tu->qused++; | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | static void snd_timer_user_ccallback(snd_timer_instance_t *timeri, | |
1129 | enum sndrv_timer_event event, | |
1130 | struct timespec *tstamp, | |
1131 | unsigned long resolution) | |
1132 | { | |
1133 | snd_timer_user_t *tu = timeri->callback_data; | |
1134 | snd_timer_tread_t r1; | |
1135 | ||
1136 | if (event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE) | |
1137 | tu->tstamp = *tstamp; | |
1138 | if ((tu->filter & (1 << event)) == 0 || !tu->tread) | |
1139 | return; | |
1140 | r1.event = event; | |
1141 | r1.tstamp = *tstamp; | |
1142 | r1.val = resolution; | |
1143 | spin_lock(&tu->qlock); | |
1144 | snd_timer_user_append_to_tqueue(tu, &r1); | |
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_tinterrupt(snd_timer_instance_t *timeri, | |
1151 | unsigned long resolution, | |
1152 | unsigned long ticks) | |
1153 | { | |
1154 | snd_timer_user_t *tu = timeri->callback_data; | |
1155 | snd_timer_tread_t *r, r1; | |
1156 | struct timespec tstamp; | |
1157 | int prev, append = 0; | |
1158 | ||
1159 | snd_timestamp_zero(&tstamp); | |
1160 | spin_lock(&tu->qlock); | |
1161 | if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION)|(1 << SNDRV_TIMER_EVENT_TICK))) == 0) { | |
1162 | spin_unlock(&tu->qlock); | |
1163 | return; | |
1164 | } | |
1165 | if (tu->last_resolution != resolution || ticks > 0) | |
1166 | snd_timestamp_now(&tstamp, 1); | |
1167 | if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && tu->last_resolution != resolution) { | |
1168 | r1.event = SNDRV_TIMER_EVENT_RESOLUTION; | |
1169 | r1.tstamp = tstamp; | |
1170 | r1.val = resolution; | |
1171 | snd_timer_user_append_to_tqueue(tu, &r1); | |
1172 | tu->last_resolution = resolution; | |
1173 | append++; | |
1174 | } | |
1175 | if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) | |
1176 | goto __wake; | |
1177 | if (ticks == 0) | |
1178 | goto __wake; | |
1179 | if (tu->qused > 0) { | |
1180 | prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; | |
1181 | r = &tu->tqueue[prev]; | |
1182 | if (r->event == SNDRV_TIMER_EVENT_TICK) { | |
1183 | r->tstamp = tstamp; | |
1184 | r->val += ticks; | |
1185 | append++; | |
1186 | goto __wake; | |
1187 | } | |
1188 | } | |
1189 | r1.event = SNDRV_TIMER_EVENT_TICK; | |
1190 | r1.tstamp = tstamp; | |
1191 | r1.val = ticks; | |
1192 | snd_timer_user_append_to_tqueue(tu, &r1); | |
1193 | append++; | |
1194 | __wake: | |
1195 | spin_unlock(&tu->qlock); | |
1196 | if (append == 0) | |
1197 | return; | |
1198 | kill_fasync(&tu->fasync, SIGIO, POLL_IN); | |
1199 | wake_up(&tu->qchange_sleep); | |
1200 | } | |
1201 | ||
1202 | static int snd_timer_user_open(struct inode *inode, struct file *file) | |
1203 | { | |
1204 | snd_timer_user_t *tu; | |
1205 | ||
1206 | tu = kcalloc(1, sizeof(*tu), GFP_KERNEL); | |
1207 | if (tu == NULL) | |
1208 | return -ENOMEM; | |
1209 | spin_lock_init(&tu->qlock); | |
1210 | init_waitqueue_head(&tu->qchange_sleep); | |
1211 | tu->ticks = 1; | |
1212 | tu->queue_size = 128; | |
1213 | tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL); | |
1214 | if (tu->queue == NULL) { | |
1215 | kfree(tu); | |
1216 | return -ENOMEM; | |
1217 | } | |
1218 | file->private_data = tu; | |
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | static int snd_timer_user_release(struct inode *inode, struct file *file) | |
1223 | { | |
1224 | snd_timer_user_t *tu; | |
1225 | ||
1226 | if (file->private_data) { | |
1227 | tu = file->private_data; | |
1228 | file->private_data = NULL; | |
1229 | fasync_helper(-1, file, 0, &tu->fasync); | |
1230 | if (tu->timeri) | |
1231 | snd_timer_close(tu->timeri); | |
1232 | kfree(tu->queue); | |
1233 | kfree(tu->tqueue); | |
1234 | kfree(tu); | |
1235 | } | |
1236 | return 0; | |
1237 | } | |
1238 | ||
1239 | static void snd_timer_user_zero_id(snd_timer_id_t *id) | |
1240 | { | |
1241 | id->dev_class = SNDRV_TIMER_CLASS_NONE; | |
1242 | id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; | |
1243 | id->card = -1; | |
1244 | id->device = -1; | |
1245 | id->subdevice = -1; | |
1246 | } | |
1247 | ||
1248 | static void snd_timer_user_copy_id(snd_timer_id_t *id, snd_timer_t *timer) | |
1249 | { | |
1250 | id->dev_class = timer->tmr_class; | |
1251 | id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; | |
1252 | id->card = timer->card ? timer->card->number : -1; | |
1253 | id->device = timer->tmr_device; | |
1254 | id->subdevice = timer->tmr_subdevice; | |
1255 | } | |
1256 | ||
1257 | static int snd_timer_user_next_device(snd_timer_id_t __user *_tid) | |
1258 | { | |
1259 | snd_timer_id_t id; | |
1260 | snd_timer_t *timer; | |
1261 | struct list_head *p; | |
1262 | ||
1263 | if (copy_from_user(&id, _tid, sizeof(id))) | |
1264 | return -EFAULT; | |
1265 | down(®ister_mutex); | |
1266 | if (id.dev_class < 0) { /* first item */ | |
1267 | if (list_empty(&snd_timer_list)) | |
1268 | snd_timer_user_zero_id(&id); | |
1269 | else { | |
1270 | timer = (snd_timer_t *)list_entry(snd_timer_list.next, snd_timer_t, device_list); | |
1271 | snd_timer_user_copy_id(&id, timer); | |
1272 | } | |
1273 | } else { | |
1274 | switch (id.dev_class) { | |
1275 | case SNDRV_TIMER_CLASS_GLOBAL: | |
1276 | id.device = id.device < 0 ? 0 : id.device + 1; | |
1277 | list_for_each(p, &snd_timer_list) { | |
1278 | timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); | |
1279 | if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { | |
1280 | snd_timer_user_copy_id(&id, timer); | |
1281 | break; | |
1282 | } | |
1283 | if (timer->tmr_device >= id.device) { | |
1284 | snd_timer_user_copy_id(&id, timer); | |
1285 | break; | |
1286 | } | |
1287 | } | |
1288 | if (p == &snd_timer_list) | |
1289 | snd_timer_user_zero_id(&id); | |
1290 | break; | |
1291 | case SNDRV_TIMER_CLASS_CARD: | |
1292 | case SNDRV_TIMER_CLASS_PCM: | |
1293 | if (id.card < 0) { | |
1294 | id.card = 0; | |
1295 | } else { | |
1296 | if (id.card < 0) { | |
1297 | id.card = 0; | |
1298 | } else { | |
1299 | if (id.device < 0) { | |
1300 | id.device = 0; | |
1301 | } else { | |
1302 | id.subdevice = id.subdevice < 0 ? 0 : id.subdevice + 1; | |
1303 | } | |
1304 | } | |
1305 | } | |
1306 | list_for_each(p, &snd_timer_list) { | |
1307 | timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); | |
1308 | if (timer->tmr_class > id.dev_class) { | |
1309 | snd_timer_user_copy_id(&id, timer); | |
1310 | break; | |
1311 | } | |
1312 | if (timer->tmr_class < id.dev_class) | |
1313 | continue; | |
1314 | if (timer->card->number > id.card) { | |
1315 | snd_timer_user_copy_id(&id, timer); | |
1316 | break; | |
1317 | } | |
1318 | if (timer->card->number < id.card) | |
1319 | continue; | |
1320 | if (timer->tmr_device > id.device) { | |
1321 | snd_timer_user_copy_id(&id, timer); | |
1322 | break; | |
1323 | } | |
1324 | if (timer->tmr_device < id.device) | |
1325 | continue; | |
1326 | if (timer->tmr_subdevice > id.subdevice) { | |
1327 | snd_timer_user_copy_id(&id, timer); | |
1328 | break; | |
1329 | } | |
1330 | if (timer->tmr_subdevice < id.subdevice) | |
1331 | continue; | |
1332 | snd_timer_user_copy_id(&id, timer); | |
1333 | break; | |
1334 | } | |
1335 | if (p == &snd_timer_list) | |
1336 | snd_timer_user_zero_id(&id); | |
1337 | break; | |
1338 | default: | |
1339 | snd_timer_user_zero_id(&id); | |
1340 | } | |
1341 | } | |
1342 | up(®ister_mutex); | |
1343 | if (copy_to_user(_tid, &id, sizeof(*_tid))) | |
1344 | return -EFAULT; | |
1345 | return 0; | |
1346 | } | |
1347 | ||
1348 | static int snd_timer_user_ginfo(struct file *file, snd_timer_ginfo_t __user *_ginfo) | |
1349 | { | |
1350 | snd_timer_ginfo_t *ginfo; | |
1351 | snd_timer_id_t tid; | |
1352 | snd_timer_t *t; | |
1353 | struct list_head *p; | |
1354 | int err = 0; | |
1355 | ||
1356 | ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL); | |
1357 | if (! ginfo) | |
1358 | return -ENOMEM; | |
1359 | if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) { | |
1360 | kfree(ginfo); | |
1361 | return -EFAULT; | |
1362 | } | |
1363 | tid = ginfo->tid; | |
1364 | memset(ginfo, 0, sizeof(*ginfo)); | |
1365 | ginfo->tid = tid; | |
1366 | down(®ister_mutex); | |
1367 | t = snd_timer_find(&tid); | |
1368 | if (t != NULL) { | |
1369 | ginfo->card = t->card ? t->card->number : -1; | |
1370 | if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) | |
1371 | ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; | |
1372 | strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); | |
1373 | strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); | |
1374 | ginfo->resolution = t->hw.resolution; | |
1375 | if (t->hw.resolution_min > 0) { | |
1376 | ginfo->resolution_min = t->hw.resolution_min; | |
1377 | ginfo->resolution_max = t->hw.resolution_max; | |
1378 | } | |
1379 | list_for_each(p, &t->open_list_head) { | |
1380 | ginfo->clients++; | |
1381 | } | |
1382 | } else { | |
1383 | err = -ENODEV; | |
1384 | } | |
1385 | up(®ister_mutex); | |
1386 | if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) | |
1387 | err = -EFAULT; | |
1388 | kfree(ginfo); | |
1389 | return err; | |
1390 | } | |
1391 | ||
1392 | static int snd_timer_user_gparams(struct file *file, snd_timer_gparams_t __user *_gparams) | |
1393 | { | |
1394 | snd_timer_gparams_t gparams; | |
1395 | snd_timer_t *t; | |
1396 | int err; | |
1397 | ||
1398 | if (copy_from_user(&gparams, _gparams, sizeof(gparams))) | |
1399 | return -EFAULT; | |
1400 | down(®ister_mutex); | |
1401 | t = snd_timer_find(&gparams.tid); | |
1402 | if (t != NULL) { | |
1403 | if (list_empty(&t->open_list_head)) { | |
1404 | if (t->hw.set_period) | |
1405 | err = t->hw.set_period(t, gparams.period_num, gparams.period_den); | |
1406 | else | |
1407 | err = -ENOSYS; | |
1408 | } else { | |
1409 | err = -EBUSY; | |
1410 | } | |
1411 | } else { | |
1412 | err = -ENODEV; | |
1413 | } | |
1414 | up(®ister_mutex); | |
1415 | return err; | |
1416 | } | |
1417 | ||
1418 | static int snd_timer_user_gstatus(struct file *file, snd_timer_gstatus_t __user *_gstatus) | |
1419 | { | |
1420 | snd_timer_gstatus_t gstatus; | |
1421 | snd_timer_id_t tid; | |
1422 | snd_timer_t *t; | |
1423 | int err = 0; | |
1424 | ||
1425 | if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) | |
1426 | return -EFAULT; | |
1427 | tid = gstatus.tid; | |
1428 | memset(&gstatus, 0, sizeof(gstatus)); | |
1429 | gstatus.tid = tid; | |
1430 | down(®ister_mutex); | |
1431 | t = snd_timer_find(&tid); | |
1432 | if (t != NULL) { | |
1433 | if (t->hw.c_resolution) | |
1434 | gstatus.resolution = t->hw.c_resolution(t); | |
1435 | else | |
1436 | gstatus.resolution = t->hw.resolution; | |
1437 | if (t->hw.precise_resolution) { | |
1438 | t->hw.precise_resolution(t, &gstatus.resolution_num, &gstatus.resolution_den); | |
1439 | } else { | |
1440 | gstatus.resolution_num = gstatus.resolution; | |
1441 | gstatus.resolution_den = 1000000000uL; | |
1442 | } | |
1443 | } else { | |
1444 | err = -ENODEV; | |
1445 | } | |
1446 | up(®ister_mutex); | |
1447 | if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) | |
1448 | err = -EFAULT; | |
1449 | return err; | |
1450 | } | |
1451 | ||
1452 | static int snd_timer_user_tselect(struct file *file, snd_timer_select_t __user *_tselect) | |
1453 | { | |
1454 | snd_timer_user_t *tu; | |
1455 | snd_timer_select_t tselect; | |
1456 | char str[32]; | |
1457 | int err; | |
1458 | ||
1459 | tu = file->private_data; | |
1460 | if (tu->timeri) | |
1461 | snd_timer_close(tu->timeri); | |
1462 | if (copy_from_user(&tselect, _tselect, sizeof(tselect))) | |
1463 | return -EFAULT; | |
1464 | sprintf(str, "application %i", current->pid); | |
1465 | if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) | |
1466 | tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; | |
1467 | if ((err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid)) < 0) | |
1468 | return err; | |
1469 | ||
1470 | if (tu->queue) { | |
1471 | kfree(tu->queue); | |
1472 | tu->queue = NULL; | |
1473 | } | |
1474 | if (tu->tqueue) { | |
1475 | kfree(tu->tqueue); | |
1476 | tu->tqueue = NULL; | |
1477 | } | |
1478 | if (tu->tread) { | |
1479 | tu->tqueue = (snd_timer_tread_t *)kmalloc(tu->queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL); | |
1480 | if (tu->tqueue == NULL) { | |
1481 | snd_timer_close(tu->timeri); | |
1482 | return -ENOMEM; | |
1483 | } | |
1484 | } else { | |
1485 | tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL); | |
1486 | if (tu->queue == NULL) { | |
1487 | snd_timer_close(tu->timeri); | |
1488 | return -ENOMEM; | |
1489 | } | |
1490 | } | |
1491 | ||
1492 | tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; | |
1493 | tu->timeri->callback = tu->tread ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; | |
1494 | tu->timeri->ccallback = snd_timer_user_ccallback; | |
1495 | tu->timeri->callback_data = (void *)tu; | |
1496 | return 0; | |
1497 | } | |
1498 | ||
1499 | static int snd_timer_user_info(struct file *file, snd_timer_info_t __user *_info) | |
1500 | { | |
1501 | snd_timer_user_t *tu; | |
1502 | snd_timer_info_t *info; | |
1503 | snd_timer_t *t; | |
1504 | int err = 0; | |
1505 | ||
1506 | tu = file->private_data; | |
1507 | snd_assert(tu->timeri != NULL, return -ENXIO); | |
1508 | t = tu->timeri->timer; | |
1509 | snd_assert(t != NULL, return -ENXIO); | |
1510 | ||
1511 | info = kcalloc(1, sizeof(*info), GFP_KERNEL); | |
1512 | if (! info) | |
1513 | return -ENOMEM; | |
1514 | info->card = t->card ? t->card->number : -1; | |
1515 | if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) | |
1516 | info->flags |= SNDRV_TIMER_FLG_SLAVE; | |
1517 | strlcpy(info->id, t->id, sizeof(info->id)); | |
1518 | strlcpy(info->name, t->name, sizeof(info->name)); | |
1519 | info->resolution = t->hw.resolution; | |
1520 | if (copy_to_user(_info, info, sizeof(*_info))) | |
1521 | err = -EFAULT; | |
1522 | kfree(info); | |
1523 | return err; | |
1524 | } | |
1525 | ||
1526 | static int snd_timer_user_params(struct file *file, snd_timer_params_t __user *_params) | |
1527 | { | |
1528 | snd_timer_user_t *tu; | |
1529 | snd_timer_params_t params; | |
1530 | snd_timer_t *t; | |
1531 | snd_timer_read_t *tr; | |
1532 | snd_timer_tread_t *ttr; | |
1533 | int err; | |
1534 | ||
1535 | tu = file->private_data; | |
1536 | snd_assert(tu->timeri != NULL, return -ENXIO); | |
1537 | t = tu->timeri->timer; | |
1538 | snd_assert(t != NULL, return -ENXIO); | |
1539 | if (copy_from_user(¶ms, _params, sizeof(params))) | |
1540 | return -EFAULT; | |
1541 | if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { | |
1542 | err = -EINVAL; | |
1543 | goto _end; | |
1544 | } | |
1545 | if (params.queue_size > 0 && (params.queue_size < 32 || params.queue_size > 1024)) { | |
1546 | err = -EINVAL; | |
1547 | goto _end; | |
1548 | } | |
1549 | if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| | |
1550 | (1<<SNDRV_TIMER_EVENT_TICK)| | |
1551 | (1<<SNDRV_TIMER_EVENT_START)| | |
1552 | (1<<SNDRV_TIMER_EVENT_STOP)| | |
1553 | (1<<SNDRV_TIMER_EVENT_CONTINUE)| | |
1554 | (1<<SNDRV_TIMER_EVENT_PAUSE)| | |
1555 | (1<<SNDRV_TIMER_EVENT_MSTART)| | |
1556 | (1<<SNDRV_TIMER_EVENT_MSTOP)| | |
1557 | (1<<SNDRV_TIMER_EVENT_MCONTINUE)| | |
1558 | (1<<SNDRV_TIMER_EVENT_MPAUSE))) { | |
1559 | err = -EINVAL; | |
1560 | goto _end; | |
1561 | } | |
1562 | snd_timer_stop(tu->timeri); | |
1563 | spin_lock_irq(&t->lock); | |
1564 | tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| | |
1565 | SNDRV_TIMER_IFLG_EXCLUSIVE| | |
1566 | SNDRV_TIMER_IFLG_EARLY_EVENT); | |
1567 | if (params.flags & SNDRV_TIMER_PSFLG_AUTO) | |
1568 | tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; | |
1569 | if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) | |
1570 | tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; | |
1571 | if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) | |
1572 | tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; | |
1573 | spin_unlock_irq(&t->lock); | |
1574 | if (params.queue_size > 0 && (unsigned int)tu->queue_size != params.queue_size) { | |
1575 | if (tu->tread) { | |
1576 | ttr = (snd_timer_tread_t *)kmalloc(params.queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL); | |
1577 | if (ttr) { | |
1578 | kfree(tu->tqueue); | |
1579 | tu->queue_size = params.queue_size; | |
1580 | tu->tqueue = ttr; | |
1581 | } | |
1582 | } else { | |
1583 | tr = (snd_timer_read_t *)kmalloc(params.queue_size * sizeof(snd_timer_read_t), GFP_KERNEL); | |
1584 | if (tr) { | |
1585 | kfree(tu->queue); | |
1586 | tu->queue_size = params.queue_size; | |
1587 | tu->queue = tr; | |
1588 | } | |
1589 | } | |
1590 | } | |
1591 | tu->qhead = tu->qtail = tu->qused = 0; | |
1592 | if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { | |
1593 | if (tu->tread) { | |
1594 | snd_timer_tread_t tread; | |
1595 | tread.event = SNDRV_TIMER_EVENT_EARLY; | |
1596 | tread.tstamp.tv_sec = 0; | |
1597 | tread.tstamp.tv_nsec = 0; | |
1598 | tread.val = 0; | |
1599 | snd_timer_user_append_to_tqueue(tu, &tread); | |
1600 | } else { | |
1601 | snd_timer_read_t *r = &tu->queue[0]; | |
1602 | r->resolution = 0; | |
1603 | r->ticks = 0; | |
1604 | tu->qused++; | |
1605 | tu->qtail++; | |
1606 | } | |
1607 | ||
1608 | } | |
1609 | tu->filter = params.filter; | |
1610 | tu->ticks = params.ticks; | |
1611 | err = 0; | |
1612 | _end: | |
1613 | if (copy_to_user(_params, ¶ms, sizeof(params))) | |
1614 | return -EFAULT; | |
1615 | return err; | |
1616 | } | |
1617 | ||
1618 | static int snd_timer_user_status(struct file *file, snd_timer_status_t __user *_status) | |
1619 | { | |
1620 | snd_timer_user_t *tu; | |
1621 | snd_timer_status_t status; | |
1622 | ||
1623 | tu = file->private_data; | |
1624 | snd_assert(tu->timeri != NULL, return -ENXIO); | |
1625 | memset(&status, 0, sizeof(status)); | |
1626 | status.tstamp = tu->tstamp; | |
1627 | status.resolution = snd_timer_resolution(tu->timeri); | |
1628 | status.lost = tu->timeri->lost; | |
1629 | status.overrun = tu->overrun; | |
1630 | spin_lock_irq(&tu->qlock); | |
1631 | status.queue = tu->qused; | |
1632 | spin_unlock_irq(&tu->qlock); | |
1633 | if (copy_to_user(_status, &status, sizeof(status))) | |
1634 | return -EFAULT; | |
1635 | return 0; | |
1636 | } | |
1637 | ||
1638 | static int snd_timer_user_start(struct file *file) | |
1639 | { | |
1640 | int err; | |
1641 | snd_timer_user_t *tu; | |
1642 | ||
1643 | tu = file->private_data; | |
1644 | snd_assert(tu->timeri != NULL, return -ENXIO); | |
1645 | snd_timer_stop(tu->timeri); | |
1646 | tu->timeri->lost = 0; | |
1647 | tu->last_resolution = 0; | |
1648 | return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; | |
1649 | } | |
1650 | ||
1651 | static int snd_timer_user_stop(struct file *file) | |
1652 | { | |
1653 | int err; | |
1654 | snd_timer_user_t *tu; | |
1655 | ||
1656 | tu = file->private_data; | |
1657 | snd_assert(tu->timeri != NULL, return -ENXIO); | |
1658 | return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; | |
1659 | } | |
1660 | ||
1661 | static int snd_timer_user_continue(struct file *file) | |
1662 | { | |
1663 | int err; | |
1664 | snd_timer_user_t *tu; | |
1665 | ||
1666 | tu = file->private_data; | |
1667 | snd_assert(tu->timeri != NULL, return -ENXIO); | |
1668 | tu->timeri->lost = 0; | |
1669 | return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; | |
1670 | } | |
1671 | ||
1672 | static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1673 | { | |
1674 | snd_timer_user_t *tu; | |
1675 | void __user *argp = (void __user *)arg; | |
1676 | int __user *p = argp; | |
1677 | ||
1678 | tu = file->private_data; | |
1679 | switch (cmd) { | |
1680 | case SNDRV_TIMER_IOCTL_PVERSION: | |
1681 | return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; | |
1682 | case SNDRV_TIMER_IOCTL_NEXT_DEVICE: | |
1683 | return snd_timer_user_next_device(argp); | |
1684 | case SNDRV_TIMER_IOCTL_TREAD: | |
1685 | { | |
1686 | int xarg; | |
1687 | ||
1688 | if (tu->timeri) /* too late */ | |
1689 | return -EBUSY; | |
1690 | if (get_user(xarg, p)) | |
1691 | return -EFAULT; | |
1692 | tu->tread = xarg ? 1 : 0; | |
1693 | return 0; | |
1694 | } | |
1695 | case SNDRV_TIMER_IOCTL_GINFO: | |
1696 | return snd_timer_user_ginfo(file, argp); | |
1697 | case SNDRV_TIMER_IOCTL_GPARAMS: | |
1698 | return snd_timer_user_gparams(file, argp); | |
1699 | case SNDRV_TIMER_IOCTL_GSTATUS: | |
1700 | return snd_timer_user_gstatus(file, argp); | |
1701 | case SNDRV_TIMER_IOCTL_SELECT: | |
1702 | return snd_timer_user_tselect(file, argp); | |
1703 | case SNDRV_TIMER_IOCTL_INFO: | |
1704 | return snd_timer_user_info(file, argp); | |
1705 | case SNDRV_TIMER_IOCTL_PARAMS: | |
1706 | return snd_timer_user_params(file, argp); | |
1707 | case SNDRV_TIMER_IOCTL_STATUS: | |
1708 | return snd_timer_user_status(file, argp); | |
1709 | case SNDRV_TIMER_IOCTL_START: | |
1710 | return snd_timer_user_start(file); | |
1711 | case SNDRV_TIMER_IOCTL_STOP: | |
1712 | return snd_timer_user_stop(file); | |
1713 | case SNDRV_TIMER_IOCTL_CONTINUE: | |
1714 | return snd_timer_user_continue(file); | |
1715 | } | |
1716 | return -ENOTTY; | |
1717 | } | |
1718 | ||
1719 | static int snd_timer_user_fasync(int fd, struct file * file, int on) | |
1720 | { | |
1721 | snd_timer_user_t *tu; | |
1722 | int err; | |
1723 | ||
1724 | tu = file->private_data; | |
1725 | err = fasync_helper(fd, file, on, &tu->fasync); | |
1726 | if (err < 0) | |
1727 | return err; | |
1728 | return 0; | |
1729 | } | |
1730 | ||
1731 | static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, size_t count, loff_t *offset) | |
1732 | { | |
1733 | snd_timer_user_t *tu; | |
1734 | long result = 0, unit; | |
1735 | int err = 0; | |
1736 | ||
1737 | tu = file->private_data; | |
1738 | unit = tu->tread ? sizeof(snd_timer_tread_t) : sizeof(snd_timer_read_t); | |
1739 | spin_lock_irq(&tu->qlock); | |
1740 | while ((long)count - result >= unit) { | |
1741 | while (!tu->qused) { | |
1742 | wait_queue_t wait; | |
1743 | ||
1744 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
1745 | err = -EAGAIN; | |
1746 | break; | |
1747 | } | |
1748 | ||
1749 | set_current_state(TASK_INTERRUPTIBLE); | |
1750 | init_waitqueue_entry(&wait, current); | |
1751 | add_wait_queue(&tu->qchange_sleep, &wait); | |
1752 | ||
1753 | spin_unlock_irq(&tu->qlock); | |
1754 | schedule(); | |
1755 | spin_lock_irq(&tu->qlock); | |
1756 | ||
1757 | remove_wait_queue(&tu->qchange_sleep, &wait); | |
1758 | ||
1759 | if (signal_pending(current)) { | |
1760 | err = -ERESTARTSYS; | |
1761 | break; | |
1762 | } | |
1763 | } | |
1764 | ||
1765 | spin_unlock_irq(&tu->qlock); | |
1766 | if (err < 0) | |
1767 | goto _error; | |
1768 | ||
1769 | if (tu->tread) { | |
1770 | if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], sizeof(snd_timer_tread_t))) { | |
1771 | err = -EFAULT; | |
1772 | goto _error; | |
1773 | } | |
1774 | } else { | |
1775 | if (copy_to_user(buffer, &tu->queue[tu->qhead++], sizeof(snd_timer_read_t))) { | |
1776 | err = -EFAULT; | |
1777 | goto _error; | |
1778 | } | |
1779 | } | |
1780 | ||
1781 | tu->qhead %= tu->queue_size; | |
1782 | ||
1783 | result += unit; | |
1784 | buffer += unit; | |
1785 | ||
1786 | spin_lock_irq(&tu->qlock); | |
1787 | tu->qused--; | |
1788 | } | |
1789 | spin_unlock_irq(&tu->qlock); | |
1790 | _error: | |
1791 | return result > 0 ? result : err; | |
1792 | } | |
1793 | ||
1794 | static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) | |
1795 | { | |
1796 | unsigned int mask; | |
1797 | snd_timer_user_t *tu; | |
1798 | ||
1799 | tu = file->private_data; | |
1800 | ||
1801 | poll_wait(file, &tu->qchange_sleep, wait); | |
1802 | ||
1803 | mask = 0; | |
1804 | if (tu->qused) | |
1805 | mask |= POLLIN | POLLRDNORM; | |
1806 | ||
1807 | return mask; | |
1808 | } | |
1809 | ||
1810 | #ifdef CONFIG_COMPAT | |
1811 | #include "timer_compat.c" | |
1812 | #else | |
1813 | #define snd_timer_user_ioctl_compat NULL | |
1814 | #endif | |
1815 | ||
1816 | static struct file_operations snd_timer_f_ops = | |
1817 | { | |
1818 | .owner = THIS_MODULE, | |
1819 | .read = snd_timer_user_read, | |
1820 | .open = snd_timer_user_open, | |
1821 | .release = snd_timer_user_release, | |
1822 | .poll = snd_timer_user_poll, | |
1823 | .unlocked_ioctl = snd_timer_user_ioctl, | |
1824 | .compat_ioctl = snd_timer_user_ioctl_compat, | |
1825 | .fasync = snd_timer_user_fasync, | |
1826 | }; | |
1827 | ||
1828 | static snd_minor_t snd_timer_reg = | |
1829 | { | |
1830 | .comment = "timer", | |
1831 | .f_ops = &snd_timer_f_ops, | |
1832 | }; | |
1833 | ||
1834 | /* | |
1835 | * ENTRY functions | |
1836 | */ | |
1837 | ||
1838 | static snd_info_entry_t *snd_timer_proc_entry = NULL; | |
1839 | ||
1840 | static int __init alsa_timer_init(void) | |
1841 | { | |
1842 | int err; | |
1843 | snd_info_entry_t *entry; | |
1844 | ||
1845 | #ifdef SNDRV_OSS_INFO_DEV_TIMERS | |
1846 | snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, "system timer"); | |
1847 | #endif | |
1848 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL)) != NULL) { | |
1849 | entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128; | |
1850 | entry->c.text.read = snd_timer_proc_read; | |
1851 | if (snd_info_register(entry) < 0) { | |
1852 | snd_info_free_entry(entry); | |
1853 | entry = NULL; | |
1854 | } | |
1855 | } | |
1856 | snd_timer_proc_entry = entry; | |
1857 | if ((err = snd_timer_register_system()) < 0) | |
1858 | snd_printk(KERN_ERR "unable to register system timer (%i)\n", err); | |
1859 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, | |
1860 | NULL, 0, &snd_timer_reg, "timer"))<0) | |
1861 | snd_printk(KERN_ERR "unable to register timer device (%i)\n", err); | |
1862 | return 0; | |
1863 | } | |
1864 | ||
1865 | static void __exit alsa_timer_exit(void) | |
1866 | { | |
1867 | struct list_head *p, *n; | |
1868 | ||
1869 | snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); | |
1870 | /* unregister the system timer */ | |
1871 | list_for_each_safe(p, n, &snd_timer_list) { | |
1872 | snd_timer_t *timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); | |
1873 | snd_timer_unregister(timer); | |
1874 | } | |
1875 | if (snd_timer_proc_entry) { | |
1876 | snd_info_unregister(snd_timer_proc_entry); | |
1877 | snd_timer_proc_entry = NULL; | |
1878 | } | |
1879 | #ifdef SNDRV_OSS_INFO_DEV_TIMERS | |
1880 | snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); | |
1881 | #endif | |
1882 | } | |
1883 | ||
1884 | module_init(alsa_timer_init) | |
1885 | module_exit(alsa_timer_exit) | |
1886 | ||
1887 | EXPORT_SYMBOL(snd_timer_open); | |
1888 | EXPORT_SYMBOL(snd_timer_close); | |
1889 | EXPORT_SYMBOL(snd_timer_resolution); | |
1890 | EXPORT_SYMBOL(snd_timer_start); | |
1891 | EXPORT_SYMBOL(snd_timer_stop); | |
1892 | EXPORT_SYMBOL(snd_timer_continue); | |
1893 | EXPORT_SYMBOL(snd_timer_pause); | |
1894 | EXPORT_SYMBOL(snd_timer_new); | |
1895 | EXPORT_SYMBOL(snd_timer_notify); | |
1896 | EXPORT_SYMBOL(snd_timer_global_new); | |
1897 | EXPORT_SYMBOL(snd_timer_global_free); | |
1898 | EXPORT_SYMBOL(snd_timer_global_register); | |
1899 | EXPORT_SYMBOL(snd_timer_global_unregister); | |
1900 | EXPORT_SYMBOL(snd_timer_interrupt); | |
1901 | EXPORT_SYMBOL(snd_timer_system_resolution); |