]>
Commit | Line | Data |
---|---|---|
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; | |
c1935b4d | 72 | struct semaphore tread_sem; |
1da177e4 LT |
73 | } snd_timer_user_t; |
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 DECLARE_MUTEX(register_mutex); | |
85 | ||
86 | static int snd_timer_free(snd_timer_t *timer); | |
87 | static int snd_timer_dev_free(snd_device_t *device); | |
88 | static int snd_timer_dev_register(snd_device_t *device); | |
89 | static int snd_timer_dev_unregister(snd_device_t *device); | |
90 | ||
91 | static void snd_timer_reschedule(snd_timer_t * 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 snd_timer_instance_t *snd_timer_instance_new(char *owner, snd_timer_t *timer) | |
98 | { | |
99 | snd_timer_instance_t *timeri; | |
100 | timeri = kcalloc(1, sizeof(*timeri), GFP_KERNEL); | |
101 | if (timeri == NULL) | |
102 | return NULL; | |
103 | timeri->owner = snd_kmalloc_strdup(owner, GFP_KERNEL); | |
104 | if (! timeri->owner) { | |
105 | kfree(timeri); | |
106 | return NULL; | |
107 | } | |
108 | INIT_LIST_HEAD(&timeri->open_list); | |
109 | INIT_LIST_HEAD(&timeri->active_list); | |
110 | INIT_LIST_HEAD(&timeri->ack_list); | |
111 | INIT_LIST_HEAD(&timeri->slave_list_head); | |
112 | INIT_LIST_HEAD(&timeri->slave_active_head); | |
113 | ||
114 | timeri->timer = timer; | |
115 | if (timer && timer->card && !try_module_get(timer->card->module)) { | |
116 | kfree(timeri->owner); | |
117 | kfree(timeri); | |
118 | return NULL; | |
119 | } | |
120 | ||
121 | return timeri; | |
122 | } | |
123 | ||
124 | /* | |
125 | * find a timer instance from the given timer id | |
126 | */ | |
127 | static snd_timer_t *snd_timer_find(snd_timer_id_t *tid) | |
128 | { | |
129 | snd_timer_t *timer = NULL; | |
130 | struct list_head *p; | |
131 | ||
132 | list_for_each(p, &snd_timer_list) { | |
133 | timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); | |
134 | ||
135 | if (timer->tmr_class != tid->dev_class) | |
136 | continue; | |
137 | if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || | |
138 | timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && | |
139 | (timer->card == NULL || | |
140 | timer->card->number != tid->card)) | |
141 | continue; | |
142 | if (timer->tmr_device != tid->device) | |
143 | continue; | |
144 | if (timer->tmr_subdevice != tid->subdevice) | |
145 | continue; | |
146 | return timer; | |
147 | } | |
148 | return NULL; | |
149 | } | |
150 | ||
151 | #ifdef CONFIG_KMOD | |
152 | ||
153 | static void snd_timer_request(snd_timer_id_t *tid) | |
154 | { | |
155 | if (! current->fs->root) | |
156 | return; | |
157 | switch (tid->dev_class) { | |
158 | case SNDRV_TIMER_CLASS_GLOBAL: | |
159 | if (tid->device < timer_limit) | |
160 | request_module("snd-timer-%i", tid->device); | |
161 | break; | |
162 | case SNDRV_TIMER_CLASS_CARD: | |
163 | case SNDRV_TIMER_CLASS_PCM: | |
164 | if (tid->card < snd_ecards_limit) | |
165 | request_module("snd-card-%i", tid->card); | |
166 | break; | |
167 | default: | |
168 | break; | |
169 | } | |
170 | } | |
171 | ||
172 | #endif | |
173 | ||
174 | /* | |
175 | * look for a master instance matching with the slave id of the given slave. | |
176 | * when found, relink the open_link of the slave. | |
177 | * | |
178 | * call this with register_mutex down. | |
179 | */ | |
180 | static void snd_timer_check_slave(snd_timer_instance_t *slave) | |
181 | { | |
182 | snd_timer_t *timer; | |
183 | snd_timer_instance_t *master; | |
184 | struct list_head *p, *q; | |
185 | ||
186 | /* FIXME: it's really dumb to look up all entries.. */ | |
187 | list_for_each(p, &snd_timer_list) { | |
188 | timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); | |
189 | list_for_each(q, &timer->open_list_head) { | |
190 | master = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list); | |
191 | if (slave->slave_class == master->slave_class && | |
192 | slave->slave_id == master->slave_id) { | |
193 | list_del(&slave->open_list); | |
194 | list_add_tail(&slave->open_list, &master->slave_list_head); | |
195 | spin_lock_irq(&slave_active_lock); | |
196 | slave->master = master; | |
197 | slave->timer = master->timer; | |
198 | spin_unlock_irq(&slave_active_lock); | |
199 | return; | |
200 | } | |
201 | } | |
202 | } | |
203 | } | |
204 | ||
205 | /* | |
206 | * look for slave instances matching with the slave id of the given master. | |
207 | * when found, relink the open_link of slaves. | |
208 | * | |
209 | * call this with register_mutex down. | |
210 | */ | |
211 | static void snd_timer_check_master(snd_timer_instance_t *master) | |
212 | { | |
213 | snd_timer_instance_t *slave; | |
214 | struct list_head *p, *n; | |
215 | ||
216 | /* check all pending slaves */ | |
217 | list_for_each_safe(p, n, &snd_timer_slave_list) { | |
218 | slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list); | |
219 | if (slave->slave_class == master->slave_class && | |
220 | slave->slave_id == master->slave_id) { | |
221 | list_del(p); | |
222 | list_add_tail(p, &master->slave_list_head); | |
223 | spin_lock_irq(&slave_active_lock); | |
224 | slave->master = master; | |
225 | slave->timer = master->timer; | |
226 | if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) | |
227 | list_add_tail(&slave->active_list, &master->slave_active_head); | |
228 | spin_unlock_irq(&slave_active_lock); | |
229 | } | |
230 | } | |
231 | } | |
232 | ||
233 | /* | |
234 | * open a timer instance | |
235 | * when opening a master, the slave id must be here given. | |
236 | */ | |
237 | int snd_timer_open(snd_timer_instance_t **ti, | |
238 | char *owner, snd_timer_id_t *tid, | |
239 | unsigned int slave_id) | |
240 | { | |
241 | snd_timer_t *timer; | |
242 | snd_timer_instance_t *timeri = NULL; | |
243 | ||
244 | if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { | |
245 | /* open a slave instance */ | |
246 | if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || | |
247 | tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { | |
248 | snd_printd("invalid slave class %i\n", tid->dev_sclass); | |
249 | return -EINVAL; | |
250 | } | |
251 | down(®ister_mutex); | |
252 | timeri = snd_timer_instance_new(owner, NULL); | |
253 | timeri->slave_class = tid->dev_sclass; | |
254 | timeri->slave_id = tid->device; | |
255 | timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; | |
256 | list_add_tail(&timeri->open_list, &snd_timer_slave_list); | |
257 | snd_timer_check_slave(timeri); | |
258 | up(®ister_mutex); | |
259 | *ti = timeri; | |
260 | return 0; | |
261 | } | |
262 | ||
263 | /* open a master instance */ | |
264 | down(®ister_mutex); | |
265 | timer = snd_timer_find(tid); | |
266 | #ifdef CONFIG_KMOD | |
267 | if (timer == NULL) { | |
268 | up(®ister_mutex); | |
269 | snd_timer_request(tid); | |
270 | down(®ister_mutex); | |
271 | timer = snd_timer_find(tid); | |
272 | } | |
273 | #endif | |
274 | if (timer) { | |
275 | if (!list_empty(&timer->open_list_head)) { | |
276 | timeri = (snd_timer_instance_t *)list_entry(timer->open_list_head.next, snd_timer_instance_t, open_list); | |
277 | if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { | |
278 | up(®ister_mutex); | |
279 | return -EBUSY; | |
280 | } | |
281 | } | |
282 | timeri = snd_timer_instance_new(owner, timer); | |
283 | if (timeri) { | |
284 | timeri->slave_class = tid->dev_sclass; | |
285 | timeri->slave_id = slave_id; | |
286 | if (list_empty(&timer->open_list_head) && timer->hw.open) | |
287 | timer->hw.open(timer); | |
288 | list_add_tail(&timeri->open_list, &timer->open_list_head); | |
289 | snd_timer_check_master(timeri); | |
290 | } | |
291 | } else { | |
292 | up(®ister_mutex); | |
293 | return -ENODEV; | |
294 | } | |
295 | up(®ister_mutex); | |
296 | *ti = timeri; | |
297 | return 0; | |
298 | } | |
299 | ||
300 | static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event); | |
301 | ||
302 | /* | |
303 | * close a timer instance | |
304 | */ | |
305 | int snd_timer_close(snd_timer_instance_t * timeri) | |
306 | { | |
307 | snd_timer_t *timer = NULL; | |
308 | struct list_head *p, *n; | |
309 | snd_timer_instance_t *slave; | |
310 | ||
311 | snd_assert(timeri != NULL, return -ENXIO); | |
312 | ||
313 | /* force to stop the timer */ | |
314 | snd_timer_stop(timeri); | |
315 | ||
316 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { | |
317 | /* wait, until the active callback is finished */ | |
318 | spin_lock_irq(&slave_active_lock); | |
319 | while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { | |
320 | spin_unlock_irq(&slave_active_lock); | |
321 | udelay(10); | |
322 | spin_lock_irq(&slave_active_lock); | |
323 | } | |
324 | spin_unlock_irq(&slave_active_lock); | |
325 | down(®ister_mutex); | |
326 | list_del(&timeri->open_list); | |
327 | up(®ister_mutex); | |
328 | } else { | |
329 | timer = timeri->timer; | |
330 | /* wait, until the active callback is finished */ | |
331 | spin_lock_irq(&timer->lock); | |
332 | while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { | |
333 | spin_unlock_irq(&timer->lock); | |
334 | udelay(10); | |
335 | spin_lock_irq(&timer->lock); | |
336 | } | |
337 | spin_unlock_irq(&timer->lock); | |
338 | down(®ister_mutex); | |
339 | list_del(&timeri->open_list); | |
340 | if (timer && list_empty(&timer->open_list_head) && timer->hw.close) | |
341 | timer->hw.close(timer); | |
342 | /* remove slave links */ | |
343 | list_for_each_safe(p, n, &timeri->slave_list_head) { | |
344 | slave = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list); | |
345 | spin_lock_irq(&slave_active_lock); | |
346 | _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); | |
347 | list_del(p); | |
348 | list_add_tail(p, &snd_timer_slave_list); | |
349 | slave->master = NULL; | |
350 | slave->timer = NULL; | |
351 | spin_unlock_irq(&slave_active_lock); | |
352 | } | |
353 | up(®ister_mutex); | |
354 | } | |
355 | if (timeri->private_free) | |
356 | timeri->private_free(timeri); | |
357 | kfree(timeri->owner); | |
358 | kfree(timeri); | |
359 | if (timer && timer->card) | |
360 | module_put(timer->card->module); | |
361 | return 0; | |
362 | } | |
363 | ||
364 | unsigned long snd_timer_resolution(snd_timer_instance_t * timeri) | |
365 | { | |
366 | snd_timer_t * timer; | |
367 | ||
368 | if (timeri == NULL) | |
369 | return 0; | |
370 | if ((timer = timeri->timer) != NULL) { | |
371 | if (timer->hw.c_resolution) | |
372 | return timer->hw.c_resolution(timer); | |
373 | return timer->hw.resolution; | |
374 | } | |
375 | return 0; | |
376 | } | |
377 | ||
378 | static void snd_timer_notify1(snd_timer_instance_t *ti, enum sndrv_timer_event event) | |
379 | { | |
380 | snd_timer_t *timer; | |
381 | unsigned long flags; | |
382 | unsigned long resolution = 0; | |
383 | snd_timer_instance_t *ts; | |
384 | struct list_head *n; | |
385 | struct timespec tstamp; | |
386 | ||
387 | snd_timestamp_now(&tstamp, 1); | |
388 | snd_assert(event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE, return); | |
389 | if (event == SNDRV_TIMER_EVENT_START || event == SNDRV_TIMER_EVENT_CONTINUE) | |
390 | resolution = snd_timer_resolution(ti); | |
391 | if (ti->ccallback) | |
392 | ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution); | |
393 | if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) | |
394 | return; | |
395 | timer = ti->timer; | |
396 | if (timer == NULL) | |
397 | return; | |
398 | if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) | |
399 | return; | |
400 | spin_lock_irqsave(&timer->lock, flags); | |
401 | list_for_each(n, &ti->slave_active_head) { | |
402 | ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list); | |
403 | if (ts->ccallback) | |
404 | ts->ccallback(ti, event + 100, &tstamp, resolution); | |
405 | } | |
406 | spin_unlock_irqrestore(&timer->lock, flags); | |
407 | } | |
408 | ||
409 | static int snd_timer_start1(snd_timer_t *timer, snd_timer_instance_t *timeri, unsigned long sticks) | |
410 | { | |
411 | list_del(&timeri->active_list); | |
412 | list_add_tail(&timeri->active_list, &timer->active_list_head); | |
413 | if (timer->running) { | |
414 | if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) | |
415 | goto __start_now; | |
416 | timer->flags |= SNDRV_TIMER_FLG_RESCHED; | |
417 | timeri->flags |= SNDRV_TIMER_IFLG_START; | |
418 | return 1; /* delayed start */ | |
419 | } else { | |
420 | timer->sticks = sticks; | |
421 | timer->hw.start(timer); | |
422 | __start_now: | |
423 | timer->running++; | |
424 | timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; | |
425 | return 0; | |
426 | } | |
427 | } | |
428 | ||
429 | static int snd_timer_start_slave(snd_timer_instance_t *timeri) | |
430 | { | |
431 | unsigned long flags; | |
432 | ||
433 | spin_lock_irqsave(&slave_active_lock, flags); | |
434 | timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; | |
435 | if (timeri->master) | |
436 | list_add_tail(&timeri->active_list, &timeri->master->slave_active_head); | |
437 | spin_unlock_irqrestore(&slave_active_lock, flags); | |
438 | return 1; /* delayed start */ | |
439 | } | |
440 | ||
441 | /* | |
442 | * start the timer instance | |
443 | */ | |
444 | int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks) | |
445 | { | |
446 | snd_timer_t *timer; | |
447 | int result = -EINVAL; | |
448 | unsigned long flags; | |
449 | ||
450 | if (timeri == NULL || ticks < 1) | |
451 | return -EINVAL; | |
452 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { | |
453 | result = snd_timer_start_slave(timeri); | |
454 | snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); | |
455 | return result; | |
456 | } | |
457 | timer = timeri->timer; | |
458 | if (timer == NULL) | |
459 | return -EINVAL; | |
460 | spin_lock_irqsave(&timer->lock, flags); | |
461 | timeri->ticks = timeri->cticks = ticks; | |
462 | timeri->pticks = 0; | |
463 | result = snd_timer_start1(timer, timeri, ticks); | |
464 | spin_unlock_irqrestore(&timer->lock, flags); | |
465 | snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); | |
466 | return result; | |
467 | } | |
468 | ||
469 | static int _snd_timer_stop(snd_timer_instance_t * timeri, int keep_flag, enum sndrv_timer_event event) | |
470 | { | |
471 | snd_timer_t *timer; | |
472 | unsigned long flags; | |
473 | ||
474 | snd_assert(timeri != NULL, return -ENXIO); | |
475 | ||
476 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { | |
477 | if (!keep_flag) { | |
478 | spin_lock_irqsave(&slave_active_lock, flags); | |
479 | timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; | |
480 | spin_unlock_irqrestore(&slave_active_lock, flags); | |
481 | } | |
482 | goto __end; | |
483 | } | |
484 | timer = timeri->timer; | |
485 | if (!timer) | |
486 | return -EINVAL; | |
487 | spin_lock_irqsave(&timer->lock, flags); | |
488 | list_del_init(&timeri->ack_list); | |
489 | list_del_init(&timeri->active_list); | |
490 | if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && | |
491 | !(--timer->running)) { | |
492 | timer->hw.stop(timer); | |
493 | if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { | |
494 | timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; | |
495 | snd_timer_reschedule(timer, 0); | |
496 | if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { | |
497 | timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; | |
498 | timer->hw.start(timer); | |
499 | } | |
500 | } | |
501 | } | |
502 | if (!keep_flag) | |
503 | timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING|SNDRV_TIMER_IFLG_START); | |
504 | spin_unlock_irqrestore(&timer->lock, flags); | |
505 | __end: | |
506 | if (event != SNDRV_TIMER_EVENT_RESOLUTION) | |
507 | snd_timer_notify1(timeri, event); | |
508 | return 0; | |
509 | } | |
510 | ||
511 | /* | |
512 | * stop the timer instance. | |
513 | * | |
514 | * do not call this from the timer callback! | |
515 | */ | |
516 | int snd_timer_stop(snd_timer_instance_t * timeri) | |
517 | { | |
518 | snd_timer_t *timer; | |
519 | unsigned long flags; | |
520 | int err; | |
521 | ||
522 | err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); | |
523 | if (err < 0) | |
524 | return err; | |
525 | timer = timeri->timer; | |
526 | spin_lock_irqsave(&timer->lock, flags); | |
527 | timeri->cticks = timeri->ticks; | |
528 | timeri->pticks = 0; | |
529 | spin_unlock_irqrestore(&timer->lock, flags); | |
530 | return 0; | |
531 | } | |
532 | ||
533 | /* | |
534 | * start again.. the tick is kept. | |
535 | */ | |
536 | int snd_timer_continue(snd_timer_instance_t * timeri) | |
537 | { | |
538 | snd_timer_t *timer; | |
539 | int result = -EINVAL; | |
540 | unsigned long flags; | |
541 | ||
542 | if (timeri == NULL) | |
543 | return result; | |
544 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) | |
545 | return snd_timer_start_slave(timeri); | |
546 | timer = timeri->timer; | |
547 | if (! timer) | |
548 | return -EINVAL; | |
549 | spin_lock_irqsave(&timer->lock, flags); | |
550 | if (!timeri->cticks) | |
551 | timeri->cticks = 1; | |
552 | timeri->pticks = 0; | |
553 | result = snd_timer_start1(timer, timeri, timer->sticks); | |
554 | spin_unlock_irqrestore(&timer->lock, flags); | |
555 | snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); | |
556 | return result; | |
557 | } | |
558 | ||
559 | /* | |
560 | * pause.. remember the ticks left | |
561 | */ | |
562 | int snd_timer_pause(snd_timer_instance_t * timeri) | |
563 | { | |
564 | return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); | |
565 | } | |
566 | ||
567 | /* | |
568 | * reschedule the timer | |
569 | * | |
570 | * start pending instances and check the scheduling ticks. | |
571 | * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. | |
572 | */ | |
573 | static void snd_timer_reschedule(snd_timer_t * timer, unsigned long ticks_left) | |
574 | { | |
575 | snd_timer_instance_t *ti; | |
576 | unsigned long ticks = ~0UL; | |
577 | struct list_head *p; | |
578 | ||
579 | list_for_each(p, &timer->active_list_head) { | |
580 | ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list); | |
581 | if (ti->flags & SNDRV_TIMER_IFLG_START) { | |
582 | ti->flags &= ~SNDRV_TIMER_IFLG_START; | |
583 | ti->flags |= SNDRV_TIMER_IFLG_RUNNING; | |
584 | timer->running++; | |
585 | } | |
586 | if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { | |
587 | if (ticks > ti->cticks) | |
588 | ticks = ti->cticks; | |
589 | } | |
590 | } | |
591 | if (ticks == ~0UL) { | |
592 | timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; | |
593 | return; | |
594 | } | |
595 | if (ticks > timer->hw.ticks) | |
596 | ticks = timer->hw.ticks; | |
597 | if (ticks_left != ticks) | |
598 | timer->flags |= SNDRV_TIMER_FLG_CHANGE; | |
599 | timer->sticks = ticks; | |
600 | } | |
601 | ||
602 | /* | |
603 | * timer tasklet | |
604 | * | |
605 | */ | |
606 | static void snd_timer_tasklet(unsigned long arg) | |
607 | { | |
608 | snd_timer_t *timer = (snd_timer_t *) arg; | |
609 | snd_timer_instance_t *ti; | |
610 | struct list_head *p; | |
611 | unsigned long resolution, ticks; | |
612 | ||
613 | spin_lock(&timer->lock); | |
614 | /* now process all callbacks */ | |
615 | while (!list_empty(&timer->sack_list_head)) { | |
616 | p = timer->sack_list_head.next; /* get first item */ | |
617 | ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, ack_list); | |
618 | ||
619 | /* remove from ack_list and make empty */ | |
620 | list_del_init(p); | |
621 | ||
622 | ticks = ti->pticks; | |
623 | ti->pticks = 0; | |
624 | resolution = ti->resolution; | |
625 | ||
626 | ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; | |
627 | spin_unlock(&timer->lock); | |
628 | if (ti->callback) | |
629 | ti->callback(ti, resolution, ticks); | |
630 | spin_lock(&timer->lock); | |
631 | ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; | |
632 | } | |
633 | spin_unlock(&timer->lock); | |
634 | } | |
635 | ||
636 | /* | |
637 | * timer interrupt | |
638 | * | |
639 | * ticks_left is usually equal to timer->sticks. | |
640 | * | |
641 | */ | |
642 | void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left) | |
643 | { | |
644 | snd_timer_instance_t *ti, *ts; | |
645 | unsigned long resolution, ticks; | |
646 | struct list_head *p, *q, *n; | |
647 | int use_tasklet = 0; | |
648 | ||
649 | if (timer == NULL) | |
650 | return; | |
651 | ||
652 | spin_lock(&timer->lock); | |
653 | ||
654 | /* remember the current resolution */ | |
655 | if (timer->hw.c_resolution) | |
656 | resolution = timer->hw.c_resolution(timer); | |
657 | else | |
658 | resolution = timer->hw.resolution; | |
659 | ||
660 | /* loop for all active instances | |
661 | * here we cannot use list_for_each because the active_list of a processed | |
662 | * instance is relinked to done_list_head before callback is called. | |
663 | */ | |
664 | list_for_each_safe(p, n, &timer->active_list_head) { | |
665 | ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list); | |
666 | if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) | |
667 | continue; | |
668 | ti->pticks += ticks_left; | |
669 | ti->resolution = resolution; | |
670 | if (ti->cticks < ticks_left) | |
671 | ti->cticks = 0; | |
672 | else | |
673 | ti->cticks -= ticks_left; | |
674 | if (ti->cticks) /* not expired */ | |
675 | continue; | |
676 | if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { | |
677 | ti->cticks = ti->ticks; | |
678 | } else { | |
679 | ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; | |
680 | if (--timer->running) | |
681 | list_del(p); | |
682 | } | |
683 | if (list_empty(&ti->ack_list)) { | |
684 | if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || | |
685 | (ti->flags & SNDRV_TIMER_IFLG_FAST)) { | |
686 | list_add_tail(&ti->ack_list, &timer->ack_list_head); | |
687 | } else { | |
688 | list_add_tail(&ti->ack_list, &timer->sack_list_head); | |
689 | } | |
690 | } | |
691 | list_for_each(q, &ti->slave_active_head) { | |
692 | ts = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, active_list); | |
693 | ts->pticks = ti->pticks; | |
694 | ts->resolution = resolution; | |
695 | if (list_empty(&ts->ack_list)) { | |
696 | if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || | |
697 | (ti->flags & SNDRV_TIMER_IFLG_FAST)) { | |
698 | list_add_tail(&ts->ack_list, &timer->ack_list_head); | |
699 | } else { | |
700 | list_add_tail(&ts->ack_list, &timer->sack_list_head); | |
701 | } | |
702 | } | |
703 | } | |
704 | } | |
705 | if (timer->flags & SNDRV_TIMER_FLG_RESCHED) | |
706 | snd_timer_reschedule(timer, ticks_left); | |
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 = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, 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(&timer->lock); | |
744 | ||
745 | if (use_tasklet) | |
746 | tasklet_hi_schedule(&timer->task_queue); | |
747 | } | |
748 | ||
749 | /* | |
750 | ||
751 | */ | |
752 | ||
753 | int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t ** rtimer) | |
754 | { | |
755 | snd_timer_t *timer; | |
756 | int err; | |
757 | static snd_device_ops_t ops = { | |
758 | .dev_free = snd_timer_dev_free, | |
759 | .dev_register = snd_timer_dev_register, | |
760 | .dev_unregister = snd_timer_dev_unregister | |
761 | }; | |
762 | ||
763 | snd_assert(tid != NULL, return -EINVAL); | |
764 | snd_assert(rtimer != NULL, return -EINVAL); | |
765 | *rtimer = NULL; | |
766 | timer = kcalloc(1, sizeof(*timer), GFP_KERNEL); | |
767 | if (timer == NULL) | |
768 | return -ENOMEM; | |
769 | timer->tmr_class = tid->dev_class; | |
770 | timer->card = card; | |
771 | timer->tmr_device = tid->device; | |
772 | timer->tmr_subdevice = tid->subdevice; | |
773 | if (id) | |
774 | strlcpy(timer->id, id, sizeof(timer->id)); | |
775 | INIT_LIST_HEAD(&timer->device_list); | |
776 | INIT_LIST_HEAD(&timer->open_list_head); | |
777 | INIT_LIST_HEAD(&timer->active_list_head); | |
778 | INIT_LIST_HEAD(&timer->ack_list_head); | |
779 | INIT_LIST_HEAD(&timer->sack_list_head); | |
780 | spin_lock_init(&timer->lock); | |
781 | tasklet_init(&timer->task_queue, snd_timer_tasklet, (unsigned long)timer); | |
782 | if (card != NULL) { | |
783 | if ((err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops)) < 0) { | |
784 | snd_timer_free(timer); | |
785 | return err; | |
786 | } | |
787 | } | |
788 | *rtimer = timer; | |
789 | return 0; | |
790 | } | |
791 | ||
792 | static int snd_timer_free(snd_timer_t *timer) | |
793 | { | |
794 | snd_assert(timer != NULL, return -ENXIO); | |
795 | if (timer->private_free) | |
796 | timer->private_free(timer); | |
797 | kfree(timer); | |
798 | return 0; | |
799 | } | |
800 | ||
801 | int snd_timer_dev_free(snd_device_t *device) | |
802 | { | |
803 | snd_timer_t *timer = device->device_data; | |
804 | return snd_timer_free(timer); | |
805 | } | |
806 | ||
807 | int snd_timer_dev_register(snd_device_t *dev) | |
808 | { | |
809 | snd_timer_t *timer = dev->device_data; | |
810 | snd_timer_t *timer1; | |
811 | struct list_head *p; | |
812 | ||
813 | snd_assert(timer != NULL && timer->hw.start != NULL && timer->hw.stop != NULL, return -ENXIO); | |
814 | if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && | |
815 | !timer->hw.resolution && timer->hw.c_resolution == NULL) | |
816 | return -EINVAL; | |
817 | ||
818 | down(®ister_mutex); | |
819 | list_for_each(p, &snd_timer_list) { | |
820 | timer1 = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); | |
821 | if (timer1->tmr_class > timer->tmr_class) | |
822 | break; | |
823 | if (timer1->tmr_class < timer->tmr_class) | |
824 | continue; | |
825 | if (timer1->card && timer->card) { | |
826 | if (timer1->card->number > timer->card->number) | |
827 | break; | |
828 | if (timer1->card->number < timer->card->number) | |
829 | continue; | |
830 | } | |
831 | if (timer1->tmr_device > timer->tmr_device) | |
832 | break; | |
833 | if (timer1->tmr_device < timer->tmr_device) | |
834 | continue; | |
835 | if (timer1->tmr_subdevice > timer->tmr_subdevice) | |
836 | break; | |
837 | if (timer1->tmr_subdevice < timer->tmr_subdevice) | |
838 | continue; | |
839 | /* conflicts.. */ | |
840 | up(®ister_mutex); | |
841 | return -EBUSY; | |
842 | } | |
843 | list_add_tail(&timer->device_list, p); | |
844 | up(®ister_mutex); | |
845 | return 0; | |
846 | } | |
847 | ||
123992f7 | 848 | static int snd_timer_unregister(snd_timer_t *timer) |
1da177e4 LT |
849 | { |
850 | struct list_head *p, *n; | |
851 | snd_timer_instance_t *ti; | |
852 | ||
853 | snd_assert(timer != NULL, return -ENXIO); | |
854 | down(®ister_mutex); | |
855 | if (! list_empty(&timer->open_list_head)) { | |
856 | snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer); | |
857 | list_for_each_safe(p, n, &timer->open_list_head) { | |
858 | list_del_init(p); | |
859 | ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, open_list); | |
860 | ti->timer = NULL; | |
861 | } | |
862 | } | |
863 | list_del(&timer->device_list); | |
864 | up(®ister_mutex); | |
865 | return snd_timer_free(timer); | |
866 | } | |
867 | ||
868 | static int snd_timer_dev_unregister(snd_device_t *device) | |
869 | { | |
870 | snd_timer_t *timer = device->device_data; | |
871 | return snd_timer_unregister(timer); | |
872 | } | |
873 | ||
874 | void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, struct timespec *tstamp) | |
875 | { | |
876 | unsigned long flags; | |
877 | unsigned long resolution = 0; | |
878 | snd_timer_instance_t *ti, *ts; | |
879 | struct list_head *p, *n; | |
880 | ||
881 | snd_runtime_check(timer->hw.flags & SNDRV_TIMER_HW_SLAVE, return); | |
882 | snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && event <= SNDRV_TIMER_EVENT_MPAUSE, return); | |
883 | spin_lock_irqsave(&timer->lock, flags); | |
884 | if (event == SNDRV_TIMER_EVENT_MSTART || event == SNDRV_TIMER_EVENT_MCONTINUE) { | |
885 | if (timer->hw.c_resolution) | |
886 | resolution = timer->hw.c_resolution(timer); | |
887 | else | |
888 | resolution = timer->hw.resolution; | |
889 | } | |
890 | list_for_each(p, &timer->active_list_head) { | |
891 | ti = (snd_timer_instance_t *)list_entry(p, snd_timer_instance_t, active_list); | |
892 | if (ti->ccallback) | |
893 | ti->ccallback(ti, event, tstamp, resolution); | |
894 | list_for_each(n, &ti->slave_active_head) { | |
895 | ts = (snd_timer_instance_t *)list_entry(n, snd_timer_instance_t, active_list); | |
896 | if (ts->ccallback) | |
897 | ts->ccallback(ts, event, tstamp, resolution); | |
898 | } | |
899 | } | |
900 | spin_unlock_irqrestore(&timer->lock, flags); | |
901 | } | |
902 | ||
903 | /* | |
904 | * exported functions for global timers | |
905 | */ | |
906 | int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer) | |
907 | { | |
908 | snd_timer_id_t tid; | |
909 | ||
910 | tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; | |
911 | tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; | |
912 | tid.card = -1; | |
913 | tid.device = device; | |
914 | tid.subdevice = 0; | |
915 | return snd_timer_new(NULL, id, &tid, rtimer); | |
916 | } | |
917 | ||
918 | int snd_timer_global_free(snd_timer_t *timer) | |
919 | { | |
920 | return snd_timer_free(timer); | |
921 | } | |
922 | ||
923 | int snd_timer_global_register(snd_timer_t *timer) | |
924 | { | |
925 | snd_device_t dev; | |
926 | ||
927 | memset(&dev, 0, sizeof(dev)); | |
928 | dev.device_data = timer; | |
929 | return snd_timer_dev_register(&dev); | |
930 | } | |
931 | ||
932 | int snd_timer_global_unregister(snd_timer_t *timer) | |
933 | { | |
934 | return snd_timer_unregister(timer); | |
935 | } | |
936 | ||
937 | /* | |
938 | * System timer | |
939 | */ | |
940 | ||
941 | struct snd_timer_system_private { | |
942 | struct timer_list tlist; | |
943 | struct timer * timer; | |
944 | unsigned long last_expires; | |
945 | unsigned long last_jiffies; | |
946 | unsigned long correction; | |
947 | }; | |
948 | ||
1da177e4 LT |
949 | static void snd_timer_s_function(unsigned long data) |
950 | { | |
951 | snd_timer_t *timer = (snd_timer_t *)data; | |
952 | struct snd_timer_system_private *priv = timer->private_data; | |
953 | unsigned long jiff = jiffies; | |
954 | if (time_after(jiff, priv->last_expires)) | |
955 | priv->correction = (long)jiff - (long)priv->last_expires; | |
956 | snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); | |
957 | } | |
958 | ||
959 | static int snd_timer_s_start(snd_timer_t * timer) | |
960 | { | |
961 | struct snd_timer_system_private *priv; | |
962 | unsigned long njiff; | |
963 | ||
964 | priv = (struct snd_timer_system_private *) timer->private_data; | |
965 | njiff = (priv->last_jiffies = jiffies); | |
966 | if (priv->correction > timer->sticks - 1) { | |
967 | priv->correction -= timer->sticks - 1; | |
968 | njiff++; | |
969 | } else { | |
970 | njiff += timer->sticks - priv->correction; | |
971 | priv->correction -= timer->sticks; | |
972 | } | |
973 | priv->last_expires = priv->tlist.expires = njiff; | |
974 | add_timer(&priv->tlist); | |
975 | return 0; | |
976 | } | |
977 | ||
978 | static int snd_timer_s_stop(snd_timer_t * timer) | |
979 | { | |
980 | struct snd_timer_system_private *priv; | |
981 | unsigned long jiff; | |
982 | ||
983 | priv = (struct snd_timer_system_private *) timer->private_data; | |
984 | del_timer(&priv->tlist); | |
985 | jiff = jiffies; | |
986 | if (time_before(jiff, priv->last_expires)) | |
987 | timer->sticks = priv->last_expires - jiff; | |
988 | else | |
989 | timer->sticks = 1; | |
990 | return 0; | |
991 | } | |
992 | ||
993 | static struct _snd_timer_hardware snd_timer_system = | |
994 | { | |
995 | .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, | |
996 | .resolution = 1000000000L / HZ, | |
997 | .ticks = 10000000L, | |
998 | .start = snd_timer_s_start, | |
999 | .stop = snd_timer_s_stop | |
1000 | }; | |
1001 | ||
1002 | static void snd_timer_free_system(snd_timer_t *timer) | |
1003 | { | |
1004 | kfree(timer->private_data); | |
1005 | } | |
1006 | ||
1007 | static int snd_timer_register_system(void) | |
1008 | { | |
1009 | snd_timer_t *timer; | |
1010 | struct snd_timer_system_private *priv; | |
1011 | int err; | |
1012 | ||
1013 | if ((err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer)) < 0) | |
1014 | return err; | |
1015 | strcpy(timer->name, "system timer"); | |
1016 | timer->hw = snd_timer_system; | |
1017 | priv = kcalloc(1, sizeof(*priv), GFP_KERNEL); | |
1018 | if (priv == NULL) { | |
1019 | snd_timer_free(timer); | |
1020 | return -ENOMEM; | |
1021 | } | |
1022 | init_timer(&priv->tlist); | |
1023 | priv->tlist.function = snd_timer_s_function; | |
1024 | priv->tlist.data = (unsigned long) timer; | |
1025 | timer->private_data = priv; | |
1026 | timer->private_free = snd_timer_free_system; | |
1027 | return snd_timer_global_register(timer); | |
1028 | } | |
1029 | ||
1030 | /* | |
1031 | * Info interface | |
1032 | */ | |
1033 | ||
1034 | static void snd_timer_proc_read(snd_info_entry_t *entry, | |
1035 | snd_info_buffer_t * buffer) | |
1036 | { | |
1037 | unsigned long flags; | |
1038 | snd_timer_t *timer; | |
1039 | snd_timer_instance_t *ti; | |
1040 | struct list_head *p, *q; | |
1041 | ||
1042 | down(®ister_mutex); | |
1043 | list_for_each(p, &snd_timer_list) { | |
1044 | timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); | |
1045 | switch (timer->tmr_class) { | |
1046 | case SNDRV_TIMER_CLASS_GLOBAL: | |
1047 | snd_iprintf(buffer, "G%i: ", timer->tmr_device); | |
1048 | break; | |
1049 | case SNDRV_TIMER_CLASS_CARD: | |
1050 | snd_iprintf(buffer, "C%i-%i: ", timer->card->number, timer->tmr_device); | |
1051 | break; | |
1052 | case SNDRV_TIMER_CLASS_PCM: | |
1053 | snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, timer->tmr_device, timer->tmr_subdevice); | |
1054 | break; | |
1055 | default: | |
1056 | snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, timer->card ? timer->card->number : -1, timer->tmr_device, timer->tmr_subdevice); | |
1057 | } | |
1058 | snd_iprintf(buffer, "%s :", timer->name); | |
1059 | if (timer->hw.resolution) | |
1060 | snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", timer->hw.resolution / 1000, timer->hw.resolution % 1000, timer->hw.ticks); | |
1061 | if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) | |
1062 | snd_iprintf(buffer, " SLAVE"); | |
1063 | snd_iprintf(buffer, "\n"); | |
1064 | spin_lock_irqsave(&timer->lock, flags); | |
1065 | list_for_each(q, &timer->open_list_head) { | |
1066 | ti = (snd_timer_instance_t *)list_entry(q, snd_timer_instance_t, open_list); | |
1067 | snd_iprintf(buffer, " Client %s : %s : lost interrupts %li\n", | |
1068 | ti->owner ? ti->owner : "unknown", | |
1069 | ti->flags & (SNDRV_TIMER_IFLG_START|SNDRV_TIMER_IFLG_RUNNING) ? "running" : "stopped", | |
1070 | ti->lost); | |
1071 | } | |
1072 | spin_unlock_irqrestore(&timer->lock, flags); | |
1073 | } | |
1074 | up(®ister_mutex); | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * USER SPACE interface | |
1079 | */ | |
1080 | ||
1081 | static void snd_timer_user_interrupt(snd_timer_instance_t *timeri, | |
1082 | unsigned long resolution, | |
1083 | unsigned long ticks) | |
1084 | { | |
1085 | snd_timer_user_t *tu = timeri->callback_data; | |
1086 | snd_timer_read_t *r; | |
1087 | int prev; | |
1088 | ||
1089 | spin_lock(&tu->qlock); | |
1090 | if (tu->qused > 0) { | |
1091 | prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; | |
1092 | r = &tu->queue[prev]; | |
1093 | if (r->resolution == resolution) { | |
1094 | r->ticks += ticks; | |
1095 | goto __wake; | |
1096 | } | |
1097 | } | |
1098 | if (tu->qused >= tu->queue_size) { | |
1099 | tu->overrun++; | |
1100 | } else { | |
1101 | r = &tu->queue[tu->qtail++]; | |
1102 | tu->qtail %= tu->queue_size; | |
1103 | r->resolution = resolution; | |
1104 | r->ticks = ticks; | |
1105 | tu->qused++; | |
1106 | } | |
1107 | __wake: | |
1108 | spin_unlock(&tu->qlock); | |
1109 | kill_fasync(&tu->fasync, SIGIO, POLL_IN); | |
1110 | wake_up(&tu->qchange_sleep); | |
1111 | } | |
1112 | ||
1113 | static void snd_timer_user_append_to_tqueue(snd_timer_user_t *tu, snd_timer_tread_t *tread) | |
1114 | { | |
1115 | if (tu->qused >= tu->queue_size) { | |
1116 | tu->overrun++; | |
1117 | } else { | |
1118 | memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); | |
1119 | tu->qtail %= tu->queue_size; | |
1120 | tu->qused++; | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | static void snd_timer_user_ccallback(snd_timer_instance_t *timeri, | |
1125 | enum sndrv_timer_event event, | |
1126 | struct timespec *tstamp, | |
1127 | unsigned long resolution) | |
1128 | { | |
1129 | snd_timer_user_t *tu = timeri->callback_data; | |
1130 | snd_timer_tread_t r1; | |
1131 | ||
1132 | if (event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE) | |
1133 | tu->tstamp = *tstamp; | |
1134 | if ((tu->filter & (1 << event)) == 0 || !tu->tread) | |
1135 | return; | |
1136 | r1.event = event; | |
1137 | r1.tstamp = *tstamp; | |
1138 | r1.val = resolution; | |
1139 | spin_lock(&tu->qlock); | |
1140 | snd_timer_user_append_to_tqueue(tu, &r1); | |
1141 | spin_unlock(&tu->qlock); | |
1142 | kill_fasync(&tu->fasync, SIGIO, POLL_IN); | |
1143 | wake_up(&tu->qchange_sleep); | |
1144 | } | |
1145 | ||
1146 | static void snd_timer_user_tinterrupt(snd_timer_instance_t *timeri, | |
1147 | unsigned long resolution, | |
1148 | unsigned long ticks) | |
1149 | { | |
1150 | snd_timer_user_t *tu = timeri->callback_data; | |
1151 | snd_timer_tread_t *r, r1; | |
1152 | struct timespec tstamp; | |
1153 | int prev, append = 0; | |
1154 | ||
1155 | snd_timestamp_zero(&tstamp); | |
1156 | spin_lock(&tu->qlock); | |
1157 | if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION)|(1 << SNDRV_TIMER_EVENT_TICK))) == 0) { | |
1158 | spin_unlock(&tu->qlock); | |
1159 | return; | |
1160 | } | |
1161 | if (tu->last_resolution != resolution || ticks > 0) | |
1162 | snd_timestamp_now(&tstamp, 1); | |
1163 | if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && tu->last_resolution != resolution) { | |
1164 | r1.event = SNDRV_TIMER_EVENT_RESOLUTION; | |
1165 | r1.tstamp = tstamp; | |
1166 | r1.val = resolution; | |
1167 | snd_timer_user_append_to_tqueue(tu, &r1); | |
1168 | tu->last_resolution = resolution; | |
1169 | append++; | |
1170 | } | |
1171 | if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) | |
1172 | goto __wake; | |
1173 | if (ticks == 0) | |
1174 | goto __wake; | |
1175 | if (tu->qused > 0) { | |
1176 | prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; | |
1177 | r = &tu->tqueue[prev]; | |
1178 | if (r->event == SNDRV_TIMER_EVENT_TICK) { | |
1179 | r->tstamp = tstamp; | |
1180 | r->val += ticks; | |
1181 | append++; | |
1182 | goto __wake; | |
1183 | } | |
1184 | } | |
1185 | r1.event = SNDRV_TIMER_EVENT_TICK; | |
1186 | r1.tstamp = tstamp; | |
1187 | r1.val = ticks; | |
1188 | snd_timer_user_append_to_tqueue(tu, &r1); | |
1189 | append++; | |
1190 | __wake: | |
1191 | spin_unlock(&tu->qlock); | |
1192 | if (append == 0) | |
1193 | return; | |
1194 | kill_fasync(&tu->fasync, SIGIO, POLL_IN); | |
1195 | wake_up(&tu->qchange_sleep); | |
1196 | } | |
1197 | ||
1198 | static int snd_timer_user_open(struct inode *inode, struct file *file) | |
1199 | { | |
1200 | snd_timer_user_t *tu; | |
1201 | ||
1202 | tu = kcalloc(1, sizeof(*tu), GFP_KERNEL); | |
1203 | if (tu == NULL) | |
1204 | return -ENOMEM; | |
1205 | spin_lock_init(&tu->qlock); | |
1206 | init_waitqueue_head(&tu->qchange_sleep); | |
c1935b4d | 1207 | init_MUTEX(&tu->tread_sem); |
1da177e4 LT |
1208 | tu->ticks = 1; |
1209 | tu->queue_size = 128; | |
1210 | tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL); | |
1211 | if (tu->queue == NULL) { | |
1212 | kfree(tu); | |
1213 | return -ENOMEM; | |
1214 | } | |
1215 | file->private_data = tu; | |
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | static int snd_timer_user_release(struct inode *inode, struct file *file) | |
1220 | { | |
1221 | snd_timer_user_t *tu; | |
1222 | ||
1223 | if (file->private_data) { | |
1224 | tu = file->private_data; | |
1225 | file->private_data = NULL; | |
1226 | fasync_helper(-1, file, 0, &tu->fasync); | |
1227 | if (tu->timeri) | |
1228 | snd_timer_close(tu->timeri); | |
1229 | kfree(tu->queue); | |
1230 | kfree(tu->tqueue); | |
1231 | kfree(tu); | |
1232 | } | |
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | static void snd_timer_user_zero_id(snd_timer_id_t *id) | |
1237 | { | |
1238 | id->dev_class = SNDRV_TIMER_CLASS_NONE; | |
1239 | id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; | |
1240 | id->card = -1; | |
1241 | id->device = -1; | |
1242 | id->subdevice = -1; | |
1243 | } | |
1244 | ||
1245 | static void snd_timer_user_copy_id(snd_timer_id_t *id, snd_timer_t *timer) | |
1246 | { | |
1247 | id->dev_class = timer->tmr_class; | |
1248 | id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; | |
1249 | id->card = timer->card ? timer->card->number : -1; | |
1250 | id->device = timer->tmr_device; | |
1251 | id->subdevice = timer->tmr_subdevice; | |
1252 | } | |
1253 | ||
1254 | static int snd_timer_user_next_device(snd_timer_id_t __user *_tid) | |
1255 | { | |
1256 | snd_timer_id_t id; | |
1257 | snd_timer_t *timer; | |
1258 | struct list_head *p; | |
1259 | ||
1260 | if (copy_from_user(&id, _tid, sizeof(id))) | |
1261 | return -EFAULT; | |
1262 | down(®ister_mutex); | |
1263 | if (id.dev_class < 0) { /* first item */ | |
1264 | if (list_empty(&snd_timer_list)) | |
1265 | snd_timer_user_zero_id(&id); | |
1266 | else { | |
1267 | timer = (snd_timer_t *)list_entry(snd_timer_list.next, snd_timer_t, device_list); | |
1268 | snd_timer_user_copy_id(&id, timer); | |
1269 | } | |
1270 | } else { | |
1271 | switch (id.dev_class) { | |
1272 | case SNDRV_TIMER_CLASS_GLOBAL: | |
1273 | id.device = id.device < 0 ? 0 : id.device + 1; | |
1274 | list_for_each(p, &snd_timer_list) { | |
1275 | timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); | |
1276 | if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { | |
1277 | snd_timer_user_copy_id(&id, timer); | |
1278 | break; | |
1279 | } | |
1280 | if (timer->tmr_device >= id.device) { | |
1281 | snd_timer_user_copy_id(&id, timer); | |
1282 | break; | |
1283 | } | |
1284 | } | |
1285 | if (p == &snd_timer_list) | |
1286 | snd_timer_user_zero_id(&id); | |
1287 | break; | |
1288 | case SNDRV_TIMER_CLASS_CARD: | |
1289 | case SNDRV_TIMER_CLASS_PCM: | |
1290 | if (id.card < 0) { | |
1291 | id.card = 0; | |
1292 | } else { | |
1293 | if (id.card < 0) { | |
1294 | id.card = 0; | |
1295 | } else { | |
1296 | if (id.device < 0) { | |
1297 | id.device = 0; | |
1298 | } else { | |
1299 | id.subdevice = id.subdevice < 0 ? 0 : id.subdevice + 1; | |
1300 | } | |
1301 | } | |
1302 | } | |
1303 | list_for_each(p, &snd_timer_list) { | |
1304 | timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); | |
1305 | if (timer->tmr_class > id.dev_class) { | |
1306 | snd_timer_user_copy_id(&id, timer); | |
1307 | break; | |
1308 | } | |
1309 | if (timer->tmr_class < id.dev_class) | |
1310 | continue; | |
1311 | if (timer->card->number > id.card) { | |
1312 | snd_timer_user_copy_id(&id, timer); | |
1313 | break; | |
1314 | } | |
1315 | if (timer->card->number < id.card) | |
1316 | continue; | |
1317 | if (timer->tmr_device > id.device) { | |
1318 | snd_timer_user_copy_id(&id, timer); | |
1319 | break; | |
1320 | } | |
1321 | if (timer->tmr_device < id.device) | |
1322 | continue; | |
1323 | if (timer->tmr_subdevice > id.subdevice) { | |
1324 | snd_timer_user_copy_id(&id, timer); | |
1325 | break; | |
1326 | } | |
1327 | if (timer->tmr_subdevice < id.subdevice) | |
1328 | continue; | |
1329 | snd_timer_user_copy_id(&id, timer); | |
1330 | break; | |
1331 | } | |
1332 | if (p == &snd_timer_list) | |
1333 | snd_timer_user_zero_id(&id); | |
1334 | break; | |
1335 | default: | |
1336 | snd_timer_user_zero_id(&id); | |
1337 | } | |
1338 | } | |
1339 | up(®ister_mutex); | |
1340 | if (copy_to_user(_tid, &id, sizeof(*_tid))) | |
1341 | return -EFAULT; | |
1342 | return 0; | |
1343 | } | |
1344 | ||
1345 | static int snd_timer_user_ginfo(struct file *file, snd_timer_ginfo_t __user *_ginfo) | |
1346 | { | |
1347 | snd_timer_ginfo_t *ginfo; | |
1348 | snd_timer_id_t tid; | |
1349 | snd_timer_t *t; | |
1350 | struct list_head *p; | |
1351 | int err = 0; | |
1352 | ||
1353 | ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL); | |
1354 | if (! ginfo) | |
1355 | return -ENOMEM; | |
1356 | if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) { | |
1357 | kfree(ginfo); | |
1358 | return -EFAULT; | |
1359 | } | |
1360 | tid = ginfo->tid; | |
1361 | memset(ginfo, 0, sizeof(*ginfo)); | |
1362 | ginfo->tid = tid; | |
1363 | down(®ister_mutex); | |
1364 | t = snd_timer_find(&tid); | |
1365 | if (t != NULL) { | |
1366 | ginfo->card = t->card ? t->card->number : -1; | |
1367 | if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) | |
1368 | ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; | |
1369 | strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); | |
1370 | strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); | |
1371 | ginfo->resolution = t->hw.resolution; | |
1372 | if (t->hw.resolution_min > 0) { | |
1373 | ginfo->resolution_min = t->hw.resolution_min; | |
1374 | ginfo->resolution_max = t->hw.resolution_max; | |
1375 | } | |
1376 | list_for_each(p, &t->open_list_head) { | |
1377 | ginfo->clients++; | |
1378 | } | |
1379 | } else { | |
1380 | err = -ENODEV; | |
1381 | } | |
1382 | up(®ister_mutex); | |
1383 | if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) | |
1384 | err = -EFAULT; | |
1385 | kfree(ginfo); | |
1386 | return err; | |
1387 | } | |
1388 | ||
1389 | static int snd_timer_user_gparams(struct file *file, snd_timer_gparams_t __user *_gparams) | |
1390 | { | |
1391 | snd_timer_gparams_t gparams; | |
1392 | snd_timer_t *t; | |
1393 | int err; | |
1394 | ||
1395 | if (copy_from_user(&gparams, _gparams, sizeof(gparams))) | |
1396 | return -EFAULT; | |
1397 | down(®ister_mutex); | |
1398 | t = snd_timer_find(&gparams.tid); | |
1399 | if (t != NULL) { | |
1400 | if (list_empty(&t->open_list_head)) { | |
1401 | if (t->hw.set_period) | |
1402 | err = t->hw.set_period(t, gparams.period_num, gparams.period_den); | |
1403 | else | |
1404 | err = -ENOSYS; | |
1405 | } else { | |
1406 | err = -EBUSY; | |
1407 | } | |
1408 | } else { | |
1409 | err = -ENODEV; | |
1410 | } | |
1411 | up(®ister_mutex); | |
1412 | return err; | |
1413 | } | |
1414 | ||
1415 | static int snd_timer_user_gstatus(struct file *file, snd_timer_gstatus_t __user *_gstatus) | |
1416 | { | |
1417 | snd_timer_gstatus_t gstatus; | |
1418 | snd_timer_id_t tid; | |
1419 | snd_timer_t *t; | |
1420 | int err = 0; | |
1421 | ||
1422 | if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) | |
1423 | return -EFAULT; | |
1424 | tid = gstatus.tid; | |
1425 | memset(&gstatus, 0, sizeof(gstatus)); | |
1426 | gstatus.tid = tid; | |
1427 | down(®ister_mutex); | |
1428 | t = snd_timer_find(&tid); | |
1429 | if (t != NULL) { | |
1430 | if (t->hw.c_resolution) | |
1431 | gstatus.resolution = t->hw.c_resolution(t); | |
1432 | else | |
1433 | gstatus.resolution = t->hw.resolution; | |
1434 | if (t->hw.precise_resolution) { | |
1435 | t->hw.precise_resolution(t, &gstatus.resolution_num, &gstatus.resolution_den); | |
1436 | } else { | |
1437 | gstatus.resolution_num = gstatus.resolution; | |
1438 | gstatus.resolution_den = 1000000000uL; | |
1439 | } | |
1440 | } else { | |
1441 | err = -ENODEV; | |
1442 | } | |
1443 | up(®ister_mutex); | |
1444 | if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) | |
1445 | err = -EFAULT; | |
1446 | return err; | |
1447 | } | |
1448 | ||
1449 | static int snd_timer_user_tselect(struct file *file, snd_timer_select_t __user *_tselect) | |
1450 | { | |
1451 | snd_timer_user_t *tu; | |
1452 | snd_timer_select_t tselect; | |
1453 | char str[32]; | |
c1935b4d | 1454 | int err = 0; |
1da177e4 LT |
1455 | |
1456 | tu = file->private_data; | |
c1935b4d JK |
1457 | down(&tu->tread_sem); |
1458 | if (tu->timeri) { | |
1da177e4 | 1459 | snd_timer_close(tu->timeri); |
c1935b4d JK |
1460 | tu->timeri = NULL; |
1461 | } | |
1462 | if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { | |
1463 | err = -EFAULT; | |
1464 | goto __err; | |
1465 | } | |
1da177e4 LT |
1466 | sprintf(str, "application %i", current->pid); |
1467 | if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) | |
1468 | tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; | |
1469 | if ((err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid)) < 0) | |
c1935b4d | 1470 | goto __err; |
1da177e4 | 1471 | |
4d572776 JJ |
1472 | kfree(tu->queue); |
1473 | tu->queue = NULL; | |
1474 | kfree(tu->tqueue); | |
1475 | tu->tqueue = NULL; | |
1da177e4 LT |
1476 | if (tu->tread) { |
1477 | tu->tqueue = (snd_timer_tread_t *)kmalloc(tu->queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL); | |
c1935b4d JK |
1478 | if (tu->tqueue == NULL) |
1479 | err = -ENOMEM; | |
1da177e4 LT |
1480 | } else { |
1481 | tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL); | |
c1935b4d JK |
1482 | if (tu->queue == NULL) |
1483 | err = -ENOMEM; | |
1da177e4 LT |
1484 | } |
1485 | ||
c1935b4d JK |
1486 | if (err < 0) { |
1487 | snd_timer_close(tu->timeri); | |
1488 | tu->timeri = NULL; | |
1489 | } else { | |
1490 | tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; | |
1491 | tu->timeri->callback = tu->tread ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; | |
1492 | tu->timeri->ccallback = snd_timer_user_ccallback; | |
1493 | tu->timeri->callback_data = (void *)tu; | |
1494 | } | |
1495 | ||
1496 | __err: | |
1497 | up(&tu->tread_sem); | |
1498 | return err; | |
1da177e4 LT |
1499 | } |
1500 | ||
1501 | static int snd_timer_user_info(struct file *file, snd_timer_info_t __user *_info) | |
1502 | { | |
1503 | snd_timer_user_t *tu; | |
1504 | snd_timer_info_t *info; | |
1505 | snd_timer_t *t; | |
1506 | int err = 0; | |
1507 | ||
1508 | tu = file->private_data; | |
1509 | snd_assert(tu->timeri != NULL, return -ENXIO); | |
1510 | t = tu->timeri->timer; | |
1511 | snd_assert(t != NULL, return -ENXIO); | |
1512 | ||
1513 | info = kcalloc(1, sizeof(*info), GFP_KERNEL); | |
1514 | if (! info) | |
1515 | return -ENOMEM; | |
1516 | info->card = t->card ? t->card->number : -1; | |
1517 | if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) | |
1518 | info->flags |= SNDRV_TIMER_FLG_SLAVE; | |
1519 | strlcpy(info->id, t->id, sizeof(info->id)); | |
1520 | strlcpy(info->name, t->name, sizeof(info->name)); | |
1521 | info->resolution = t->hw.resolution; | |
1522 | if (copy_to_user(_info, info, sizeof(*_info))) | |
1523 | err = -EFAULT; | |
1524 | kfree(info); | |
1525 | return err; | |
1526 | } | |
1527 | ||
1528 | static int snd_timer_user_params(struct file *file, snd_timer_params_t __user *_params) | |
1529 | { | |
1530 | snd_timer_user_t *tu; | |
1531 | snd_timer_params_t params; | |
1532 | snd_timer_t *t; | |
1533 | snd_timer_read_t *tr; | |
1534 | snd_timer_tread_t *ttr; | |
1535 | int err; | |
1536 | ||
1537 | tu = file->private_data; | |
1538 | snd_assert(tu->timeri != NULL, return -ENXIO); | |
1539 | t = tu->timeri->timer; | |
1540 | snd_assert(t != NULL, return -ENXIO); | |
1541 | if (copy_from_user(¶ms, _params, sizeof(params))) | |
1542 | return -EFAULT; | |
1543 | if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { | |
1544 | err = -EINVAL; | |
1545 | goto _end; | |
1546 | } | |
1547 | if (params.queue_size > 0 && (params.queue_size < 32 || params.queue_size > 1024)) { | |
1548 | err = -EINVAL; | |
1549 | goto _end; | |
1550 | } | |
1551 | if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| | |
1552 | (1<<SNDRV_TIMER_EVENT_TICK)| | |
1553 | (1<<SNDRV_TIMER_EVENT_START)| | |
1554 | (1<<SNDRV_TIMER_EVENT_STOP)| | |
1555 | (1<<SNDRV_TIMER_EVENT_CONTINUE)| | |
1556 | (1<<SNDRV_TIMER_EVENT_PAUSE)| | |
1557 | (1<<SNDRV_TIMER_EVENT_MSTART)| | |
1558 | (1<<SNDRV_TIMER_EVENT_MSTOP)| | |
1559 | (1<<SNDRV_TIMER_EVENT_MCONTINUE)| | |
1560 | (1<<SNDRV_TIMER_EVENT_MPAUSE))) { | |
1561 | err = -EINVAL; | |
1562 | goto _end; | |
1563 | } | |
1564 | snd_timer_stop(tu->timeri); | |
1565 | spin_lock_irq(&t->lock); | |
1566 | tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| | |
1567 | SNDRV_TIMER_IFLG_EXCLUSIVE| | |
1568 | SNDRV_TIMER_IFLG_EARLY_EVENT); | |
1569 | if (params.flags & SNDRV_TIMER_PSFLG_AUTO) | |
1570 | tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; | |
1571 | if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) | |
1572 | tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; | |
1573 | if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) | |
1574 | tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; | |
1575 | spin_unlock_irq(&t->lock); | |
1576 | if (params.queue_size > 0 && (unsigned int)tu->queue_size != params.queue_size) { | |
1577 | if (tu->tread) { | |
1578 | ttr = (snd_timer_tread_t *)kmalloc(params.queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL); | |
1579 | if (ttr) { | |
1580 | kfree(tu->tqueue); | |
1581 | tu->queue_size = params.queue_size; | |
1582 | tu->tqueue = ttr; | |
1583 | } | |
1584 | } else { | |
1585 | tr = (snd_timer_read_t *)kmalloc(params.queue_size * sizeof(snd_timer_read_t), GFP_KERNEL); | |
1586 | if (tr) { | |
1587 | kfree(tu->queue); | |
1588 | tu->queue_size = params.queue_size; | |
1589 | tu->queue = tr; | |
1590 | } | |
1591 | } | |
1592 | } | |
1593 | tu->qhead = tu->qtail = tu->qused = 0; | |
1594 | if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { | |
1595 | if (tu->tread) { | |
1596 | snd_timer_tread_t tread; | |
1597 | tread.event = SNDRV_TIMER_EVENT_EARLY; | |
1598 | tread.tstamp.tv_sec = 0; | |
1599 | tread.tstamp.tv_nsec = 0; | |
1600 | tread.val = 0; | |
1601 | snd_timer_user_append_to_tqueue(tu, &tread); | |
1602 | } else { | |
1603 | snd_timer_read_t *r = &tu->queue[0]; | |
1604 | r->resolution = 0; | |
1605 | r->ticks = 0; | |
1606 | tu->qused++; | |
1607 | tu->qtail++; | |
1608 | } | |
1609 | ||
1610 | } | |
1611 | tu->filter = params.filter; | |
1612 | tu->ticks = params.ticks; | |
1613 | err = 0; | |
1614 | _end: | |
1615 | if (copy_to_user(_params, ¶ms, sizeof(params))) | |
1616 | return -EFAULT; | |
1617 | return err; | |
1618 | } | |
1619 | ||
1620 | static int snd_timer_user_status(struct file *file, snd_timer_status_t __user *_status) | |
1621 | { | |
1622 | snd_timer_user_t *tu; | |
1623 | snd_timer_status_t status; | |
1624 | ||
1625 | tu = file->private_data; | |
1626 | snd_assert(tu->timeri != NULL, return -ENXIO); | |
1627 | memset(&status, 0, sizeof(status)); | |
1628 | status.tstamp = tu->tstamp; | |
1629 | status.resolution = snd_timer_resolution(tu->timeri); | |
1630 | status.lost = tu->timeri->lost; | |
1631 | status.overrun = tu->overrun; | |
1632 | spin_lock_irq(&tu->qlock); | |
1633 | status.queue = tu->qused; | |
1634 | spin_unlock_irq(&tu->qlock); | |
1635 | if (copy_to_user(_status, &status, sizeof(status))) | |
1636 | return -EFAULT; | |
1637 | return 0; | |
1638 | } | |
1639 | ||
1640 | static int snd_timer_user_start(struct file *file) | |
1641 | { | |
1642 | int err; | |
1643 | snd_timer_user_t *tu; | |
1644 | ||
1645 | tu = file->private_data; | |
1646 | snd_assert(tu->timeri != NULL, return -ENXIO); | |
1647 | snd_timer_stop(tu->timeri); | |
1648 | tu->timeri->lost = 0; | |
1649 | tu->last_resolution = 0; | |
1650 | return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; | |
1651 | } | |
1652 | ||
1653 | static int snd_timer_user_stop(struct file *file) | |
1654 | { | |
1655 | int err; | |
1656 | snd_timer_user_t *tu; | |
1657 | ||
1658 | tu = file->private_data; | |
1659 | snd_assert(tu->timeri != NULL, return -ENXIO); | |
1660 | return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; | |
1661 | } | |
1662 | ||
1663 | static int snd_timer_user_continue(struct file *file) | |
1664 | { | |
1665 | int err; | |
1666 | snd_timer_user_t *tu; | |
1667 | ||
1668 | tu = file->private_data; | |
1669 | snd_assert(tu->timeri != NULL, return -ENXIO); | |
1670 | tu->timeri->lost = 0; | |
1671 | return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; | |
1672 | } | |
1673 | ||
15790a6b TI |
1674 | static int snd_timer_user_pause(struct file *file) |
1675 | { | |
1676 | int err; | |
1677 | snd_timer_user_t *tu; | |
1678 | ||
1679 | tu = file->private_data; | |
1680 | snd_assert(tu->timeri != NULL, return -ENXIO); | |
d138b445 | 1681 | return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; |
15790a6b TI |
1682 | } |
1683 | ||
8c50b37c TI |
1684 | enum { |
1685 | SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), | |
1686 | SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), | |
1687 | SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), | |
1688 | SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), | |
1689 | }; | |
1690 | ||
1da177e4 LT |
1691 | static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1692 | { | |
1693 | snd_timer_user_t *tu; | |
1694 | void __user *argp = (void __user *)arg; | |
1695 | int __user *p = argp; | |
1696 | ||
1697 | tu = file->private_data; | |
1698 | switch (cmd) { | |
1699 | case SNDRV_TIMER_IOCTL_PVERSION: | |
1700 | return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; | |
1701 | case SNDRV_TIMER_IOCTL_NEXT_DEVICE: | |
1702 | return snd_timer_user_next_device(argp); | |
1703 | case SNDRV_TIMER_IOCTL_TREAD: | |
1704 | { | |
1705 | int xarg; | |
1706 | ||
c1935b4d JK |
1707 | down(&tu->tread_sem); |
1708 | if (tu->timeri) { /* too late */ | |
1709 | up(&tu->tread_sem); | |
1da177e4 | 1710 | return -EBUSY; |
c1935b4d JK |
1711 | } |
1712 | if (get_user(xarg, p)) { | |
1713 | up(&tu->tread_sem); | |
1da177e4 | 1714 | return -EFAULT; |
c1935b4d | 1715 | } |
1da177e4 | 1716 | tu->tread = xarg ? 1 : 0; |
c1935b4d | 1717 | up(&tu->tread_sem); |
1da177e4 LT |
1718 | return 0; |
1719 | } | |
1720 | case SNDRV_TIMER_IOCTL_GINFO: | |
1721 | return snd_timer_user_ginfo(file, argp); | |
1722 | case SNDRV_TIMER_IOCTL_GPARAMS: | |
1723 | return snd_timer_user_gparams(file, argp); | |
1724 | case SNDRV_TIMER_IOCTL_GSTATUS: | |
1725 | return snd_timer_user_gstatus(file, argp); | |
1726 | case SNDRV_TIMER_IOCTL_SELECT: | |
1727 | return snd_timer_user_tselect(file, argp); | |
1728 | case SNDRV_TIMER_IOCTL_INFO: | |
1729 | return snd_timer_user_info(file, argp); | |
1730 | case SNDRV_TIMER_IOCTL_PARAMS: | |
1731 | return snd_timer_user_params(file, argp); | |
1732 | case SNDRV_TIMER_IOCTL_STATUS: | |
1733 | return snd_timer_user_status(file, argp); | |
1734 | case SNDRV_TIMER_IOCTL_START: | |
8c50b37c | 1735 | case SNDRV_TIMER_IOCTL_START_OLD: |
1da177e4 LT |
1736 | return snd_timer_user_start(file); |
1737 | case SNDRV_TIMER_IOCTL_STOP: | |
8c50b37c | 1738 | case SNDRV_TIMER_IOCTL_STOP_OLD: |
1da177e4 LT |
1739 | return snd_timer_user_stop(file); |
1740 | case SNDRV_TIMER_IOCTL_CONTINUE: | |
8c50b37c | 1741 | case SNDRV_TIMER_IOCTL_CONTINUE_OLD: |
1da177e4 | 1742 | return snd_timer_user_continue(file); |
15790a6b | 1743 | case SNDRV_TIMER_IOCTL_PAUSE: |
8c50b37c | 1744 | case SNDRV_TIMER_IOCTL_PAUSE_OLD: |
15790a6b | 1745 | return snd_timer_user_pause(file); |
1da177e4 LT |
1746 | } |
1747 | return -ENOTTY; | |
1748 | } | |
1749 | ||
1750 | static int snd_timer_user_fasync(int fd, struct file * file, int on) | |
1751 | { | |
1752 | snd_timer_user_t *tu; | |
1753 | int err; | |
1754 | ||
1755 | tu = file->private_data; | |
1756 | err = fasync_helper(fd, file, on, &tu->fasync); | |
1757 | if (err < 0) | |
1758 | return err; | |
1759 | return 0; | |
1760 | } | |
1761 | ||
1762 | static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, size_t count, loff_t *offset) | |
1763 | { | |
1764 | snd_timer_user_t *tu; | |
1765 | long result = 0, unit; | |
1766 | int err = 0; | |
1767 | ||
1768 | tu = file->private_data; | |
1769 | unit = tu->tread ? sizeof(snd_timer_tread_t) : sizeof(snd_timer_read_t); | |
1770 | spin_lock_irq(&tu->qlock); | |
1771 | while ((long)count - result >= unit) { | |
1772 | while (!tu->qused) { | |
1773 | wait_queue_t wait; | |
1774 | ||
1775 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
1776 | err = -EAGAIN; | |
1777 | break; | |
1778 | } | |
1779 | ||
1780 | set_current_state(TASK_INTERRUPTIBLE); | |
1781 | init_waitqueue_entry(&wait, current); | |
1782 | add_wait_queue(&tu->qchange_sleep, &wait); | |
1783 | ||
1784 | spin_unlock_irq(&tu->qlock); | |
1785 | schedule(); | |
1786 | spin_lock_irq(&tu->qlock); | |
1787 | ||
1788 | remove_wait_queue(&tu->qchange_sleep, &wait); | |
1789 | ||
1790 | if (signal_pending(current)) { | |
1791 | err = -ERESTARTSYS; | |
1792 | break; | |
1793 | } | |
1794 | } | |
1795 | ||
1796 | spin_unlock_irq(&tu->qlock); | |
1797 | if (err < 0) | |
1798 | goto _error; | |
1799 | ||
1800 | if (tu->tread) { | |
1801 | if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], sizeof(snd_timer_tread_t))) { | |
1802 | err = -EFAULT; | |
1803 | goto _error; | |
1804 | } | |
1805 | } else { | |
1806 | if (copy_to_user(buffer, &tu->queue[tu->qhead++], sizeof(snd_timer_read_t))) { | |
1807 | err = -EFAULT; | |
1808 | goto _error; | |
1809 | } | |
1810 | } | |
1811 | ||
1812 | tu->qhead %= tu->queue_size; | |
1813 | ||
1814 | result += unit; | |
1815 | buffer += unit; | |
1816 | ||
1817 | spin_lock_irq(&tu->qlock); | |
1818 | tu->qused--; | |
1819 | } | |
1820 | spin_unlock_irq(&tu->qlock); | |
1821 | _error: | |
1822 | return result > 0 ? result : err; | |
1823 | } | |
1824 | ||
1825 | static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) | |
1826 | { | |
1827 | unsigned int mask; | |
1828 | snd_timer_user_t *tu; | |
1829 | ||
1830 | tu = file->private_data; | |
1831 | ||
1832 | poll_wait(file, &tu->qchange_sleep, wait); | |
1833 | ||
1834 | mask = 0; | |
1835 | if (tu->qused) | |
1836 | mask |= POLLIN | POLLRDNORM; | |
1837 | ||
1838 | return mask; | |
1839 | } | |
1840 | ||
1841 | #ifdef CONFIG_COMPAT | |
1842 | #include "timer_compat.c" | |
1843 | #else | |
1844 | #define snd_timer_user_ioctl_compat NULL | |
1845 | #endif | |
1846 | ||
1847 | static struct file_operations snd_timer_f_ops = | |
1848 | { | |
1849 | .owner = THIS_MODULE, | |
1850 | .read = snd_timer_user_read, | |
1851 | .open = snd_timer_user_open, | |
1852 | .release = snd_timer_user_release, | |
1853 | .poll = snd_timer_user_poll, | |
1854 | .unlocked_ioctl = snd_timer_user_ioctl, | |
1855 | .compat_ioctl = snd_timer_user_ioctl_compat, | |
1856 | .fasync = snd_timer_user_fasync, | |
1857 | }; | |
1858 | ||
1859 | static snd_minor_t snd_timer_reg = | |
1860 | { | |
1861 | .comment = "timer", | |
1862 | .f_ops = &snd_timer_f_ops, | |
1863 | }; | |
1864 | ||
1865 | /* | |
1866 | * ENTRY functions | |
1867 | */ | |
1868 | ||
1869 | static snd_info_entry_t *snd_timer_proc_entry = NULL; | |
1870 | ||
1871 | static int __init alsa_timer_init(void) | |
1872 | { | |
1873 | int err; | |
1874 | snd_info_entry_t *entry; | |
1875 | ||
1876 | #ifdef SNDRV_OSS_INFO_DEV_TIMERS | |
1877 | snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, "system timer"); | |
1878 | #endif | |
1879 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL)) != NULL) { | |
1880 | entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128; | |
1881 | entry->c.text.read = snd_timer_proc_read; | |
1882 | if (snd_info_register(entry) < 0) { | |
1883 | snd_info_free_entry(entry); | |
1884 | entry = NULL; | |
1885 | } | |
1886 | } | |
1887 | snd_timer_proc_entry = entry; | |
1888 | if ((err = snd_timer_register_system()) < 0) | |
1889 | snd_printk(KERN_ERR "unable to register system timer (%i)\n", err); | |
1890 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, | |
1891 | NULL, 0, &snd_timer_reg, "timer"))<0) | |
1892 | snd_printk(KERN_ERR "unable to register timer device (%i)\n", err); | |
1893 | return 0; | |
1894 | } | |
1895 | ||
1896 | static void __exit alsa_timer_exit(void) | |
1897 | { | |
1898 | struct list_head *p, *n; | |
1899 | ||
1900 | snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); | |
1901 | /* unregister the system timer */ | |
1902 | list_for_each_safe(p, n, &snd_timer_list) { | |
1903 | snd_timer_t *timer = (snd_timer_t *)list_entry(p, snd_timer_t, device_list); | |
1904 | snd_timer_unregister(timer); | |
1905 | } | |
1906 | if (snd_timer_proc_entry) { | |
1907 | snd_info_unregister(snd_timer_proc_entry); | |
1908 | snd_timer_proc_entry = NULL; | |
1909 | } | |
1910 | #ifdef SNDRV_OSS_INFO_DEV_TIMERS | |
1911 | snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); | |
1912 | #endif | |
1913 | } | |
1914 | ||
1915 | module_init(alsa_timer_init) | |
1916 | module_exit(alsa_timer_exit) | |
1917 | ||
1918 | EXPORT_SYMBOL(snd_timer_open); | |
1919 | EXPORT_SYMBOL(snd_timer_close); | |
1920 | EXPORT_SYMBOL(snd_timer_resolution); | |
1921 | EXPORT_SYMBOL(snd_timer_start); | |
1922 | EXPORT_SYMBOL(snd_timer_stop); | |
1923 | EXPORT_SYMBOL(snd_timer_continue); | |
1924 | EXPORT_SYMBOL(snd_timer_pause); | |
1925 | EXPORT_SYMBOL(snd_timer_new); | |
1926 | EXPORT_SYMBOL(snd_timer_notify); | |
1927 | EXPORT_SYMBOL(snd_timer_global_new); | |
1928 | EXPORT_SYMBOL(snd_timer_global_free); | |
1929 | EXPORT_SYMBOL(snd_timer_global_register); | |
1930 | EXPORT_SYMBOL(snd_timer_global_unregister); | |
1931 | EXPORT_SYMBOL(snd_timer_interrupt); |