projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[ALSA] Changed Jaroslav Kysela's e-mail from perex@suse.cz to perex@perex.cz
[linux-2.6-block.git] / sound / core / timer.c
CommitLineData
1da177e4
LT		 1/*
2 * Timers abstract layer
c1017a4c 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4
LT		 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>
1da177e4
LT		 25#include <linux/slab.h>
26#include <linux/time.h>
1a60d4c5 27#include <linux/mutex.h>
1da177e4 28#include <linux/moduleparam.h>
543537bd 29#include <linux/string.h>
1da177e4
LT		 30#include <sound/core.h>
31#include <sound/timer.h>
32#include <sound/control.h>
33#include <sound/info.h>
34#include <sound/minors.h>
35#include <sound/initval.h>
36#include <linux/kmod.h>
1da177e4
LT		 37
38#if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE)
39#define DEFAULT_TIMER_LIMIT 3
40#elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
41#define DEFAULT_TIMER_LIMIT 2
42#else
43#define DEFAULT_TIMER_LIMIT 1
44#endif
45
46static int timer_limit = DEFAULT_TIMER_LIMIT;
c1017a4c 47MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
1da177e4
LT		 48MODULE_DESCRIPTION("ALSA timer interface");
49MODULE_LICENSE("GPL");
50module_param(timer_limit, int, 0444);
51MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
52
53d2f744
TI		 53struct snd_timer_user {
54 struct snd_timer_instance *timeri;
6b172a85 55 int tread; /* enhanced read with timestamps and events */
1da177e4
LT		 56 unsigned long ticks;
57 unsigned long overrun;
58 int qhead;
59 int qtail;
60 int qused;
61 int queue_size;
53d2f744
TI		 62 struct snd_timer_read *queue;
63 struct snd_timer_tread *tqueue;
1da177e4
LT		 64 spinlock_t qlock;
65 unsigned long last_resolution;
66 unsigned int filter;
67 struct timespec tstamp; /* trigger tstamp */
68 wait_queue_head_t qchange_sleep;
69 struct fasync_struct *fasync;
1a60d4c5 70 struct mutex tread_sem;
53d2f744 71};
1da177e4
LT		 72
73/* list of timers */
74static LIST_HEAD(snd_timer_list);
75
76/* list of slave instances */
77static LIST_HEAD(snd_timer_slave_list);
78
79/* lock for slave active lists */
80static DEFINE_SPINLOCK(slave_active_lock);
81
1a60d4c5 82static DEFINE_MUTEX(register_mutex);
1da177e4 83
53d2f744
TI		 84static int snd_timer_free(struct snd_timer *timer);
85static int snd_timer_dev_free(struct snd_device *device);
86static int snd_timer_dev_register(struct snd_device *device);
c461482c 87static int snd_timer_dev_disconnect(struct snd_device *device);
1da177e4 88
53d2f744 89static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
1da177e4
LT		 90
91/*
92 * create a timer instance with the given owner string.
93 * when timer is not NULL, increments the module counter
94 */
53d2f744
TI		 95static struct snd_timer_instance *snd_timer_instance_new(char *owner,
96 struct snd_timer *timer)
1da177e4 97{
53d2f744 98 struct snd_timer_instance *timeri;
ca2c0966 99 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
1da177e4
LT		 100 if (timeri == NULL)
101 return NULL;
543537bd 102 timeri->owner = kstrdup(owner, GFP_KERNEL);
1da177e4
LT		 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;
de24214d 114 if (timer && !try_module_get(timer->module)) {
1da177e4
LT		 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 */
53d2f744 126static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
1da177e4 127{
53d2f744 128 struct snd_timer *timer = NULL;
1da177e4 129
9244b2c3 130 list_for_each_entry(timer, &snd_timer_list, device_list) {
1da177e4
LT		 131 if (timer->tmr_class != tid->dev_class)
132 continue;
133 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
134 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
135 (timer->card == NULL ||
136 timer->card->number != tid->card))
137 continue;
138 if (timer->tmr_device != tid->device)
139 continue;
140 if (timer->tmr_subdevice != tid->subdevice)
141 continue;
142 return timer;
143 }
144 return NULL;
145}
146
147#ifdef CONFIG_KMOD
148
53d2f744 149static void snd_timer_request(struct snd_timer_id *tid)
1da177e4
LT		 150{
151 if (! current->fs->root)
152 return;
153 switch (tid->dev_class) {
154 case SNDRV_TIMER_CLASS_GLOBAL:
155 if (tid->device < timer_limit)
156 request_module("snd-timer-%i", tid->device);
157 break;
158 case SNDRV_TIMER_CLASS_CARD:
159 case SNDRV_TIMER_CLASS_PCM:
160 if (tid->card < snd_ecards_limit)
161 request_module("snd-card-%i", tid->card);
162 break;
163 default:
164 break;
165 }
166}
167
168#endif
169
170/*
171 * look for a master instance matching with the slave id of the given slave.
172 * when found, relink the open_link of the slave.
173 *
174 * call this with register_mutex down.
175 */
53d2f744 176static void snd_timer_check_slave(struct snd_timer_instance *slave)
1da177e4 177{
53d2f744
TI		 178 struct snd_timer *timer;
179 struct snd_timer_instance *master;
1da177e4
LT		 180
181 /* FIXME: it's really dumb to look up all entries.. */
9244b2c3
JB		 182 list_for_each_entry(timer, &snd_timer_list, device_list) {
183 list_for_each_entry(master, &timer->open_list_head, open_list) {
1da177e4
LT		 184 if (slave->slave_class == master->slave_class &&
185 slave->slave_id == master->slave_id) {
186 list_del(&slave->open_list);
6b172a85
CL		 187 list_add_tail(&slave->open_list,
188 &master->slave_list_head);
1da177e4
LT		 189 spin_lock_irq(&slave_active_lock);
190 slave->master = master;
191 slave->timer = master->timer;
192 spin_unlock_irq(&slave_active_lock);
193 return;
194 }
195 }
196 }
197}
198
199/*
200 * look for slave instances matching with the slave id of the given master.
201 * when found, relink the open_link of slaves.
202 *
203 * call this with register_mutex down.
204 */
53d2f744 205static void snd_timer_check_master(struct snd_timer_instance *master)
1da177e4 206{
9244b2c3 207 struct snd_timer_instance *slave, *tmp;
1da177e4
LT		 208
209 /* check all pending slaves */
9244b2c3 210 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
1da177e4
LT		 211 if (slave->slave_class == master->slave_class &&
212 slave->slave_id == master->slave_id) {
9244b2c3 213 list_move_tail(&slave->open_list, &master->slave_list_head);
1da177e4
LT		 214 spin_lock_irq(&slave_active_lock);
215 slave->master = master;
216 slave->timer = master->timer;
217 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
6b172a85
CL		 218 list_add_tail(&slave->active_list,
219 &master->slave_active_head);
1da177e4
LT		 220 spin_unlock_irq(&slave_active_lock);
221 }
222 }
223}
224
225/*
226 * open a timer instance
227 * when opening a master, the slave id must be here given.
228 */
53d2f744
TI		 229int snd_timer_open(struct snd_timer_instance **ti,
230 char *owner, struct snd_timer_id *tid,
1da177e4
LT		 231 unsigned int slave_id)
232{
53d2f744
TI		 233 struct snd_timer *timer;
234 struct snd_timer_instance *timeri = NULL;
6b172a85 235
1da177e4
LT		 236 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
237 /* open a slave instance */
238 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
239 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
240 snd_printd("invalid slave class %i\n", tid->dev_sclass);
241 return -EINVAL;
242 }
1a60d4c5 243 mutex_lock(&register_mutex);
1da177e4 244 timeri = snd_timer_instance_new(owner, NULL);
2fd43d11 245 if (!timeri) {
1a60d4c5 246 mutex_unlock(&register_mutex);
2fd43d11
CL		 247 return -ENOMEM;
248 }
1da177e4
LT		 249 timeri->slave_class = tid->dev_sclass;
250 timeri->slave_id = tid->device;
251 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
252 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
253 snd_timer_check_slave(timeri);
1a60d4c5 254 mutex_unlock(&register_mutex);
1da177e4
LT		 255 *ti = timeri;
256 return 0;
257 }
258
259 /* open a master instance */
1a60d4c5 260 mutex_lock(&register_mutex);
1da177e4
LT		 261 timer = snd_timer_find(tid);
262#ifdef CONFIG_KMOD
263 if (timer == NULL) {
1a60d4c5 264 mutex_unlock(&register_mutex);
1da177e4 265 snd_timer_request(tid);
1a60d4c5 266 mutex_lock(&register_mutex);
1da177e4
LT		 267 timer = snd_timer_find(tid);
268 }
269#endif
2fd43d11 270 if (!timer) {
1a60d4c5 271 mutex_unlock(&register_mutex);
1da177e4
LT		 272 return -ENODEV;
273 }
2fd43d11
CL		 274 if (!list_empty(&timer->open_list_head)) {
275 timeri = list_entry(timer->open_list_head.next,
53d2f744 276 struct snd_timer_instance, open_list);
2fd43d11 277 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
1a60d4c5 278 mutex_unlock(&register_mutex);
2fd43d11
CL		 279 return -EBUSY;
280 }
281 }
282 timeri = snd_timer_instance_new(owner, timer);
283 if (!timeri) {
1a60d4c5 284 mutex_unlock(&register_mutex);
2fd43d11
CL		 285 return -ENOMEM;
286 }
287 timeri->slave_class = tid->dev_sclass;
288 timeri->slave_id = slave_id;
289 if (list_empty(&timer->open_list_head) && timer->hw.open)
290 timer->hw.open(timer);
291 list_add_tail(&timeri->open_list, &timer->open_list_head);
292 snd_timer_check_master(timeri);
1a60d4c5 293 mutex_unlock(&register_mutex);
1da177e4
LT		 294 *ti = timeri;
295 return 0;
296}
297
53d2f744
TI		 298static int _snd_timer_stop(struct snd_timer_instance *timeri,
299 int keep_flag, int event);
1da177e4
LT		 300
301/*
302 * close a timer instance
303 */
53d2f744 304int snd_timer_close(struct snd_timer_instance *timeri)
1da177e4 305{
53d2f744 306 struct snd_timer *timer = NULL;
9244b2c3 307 struct snd_timer_instance *slave, *tmp;
1da177e4
LT		 308
309 snd_assert(timeri != NULL, return -ENXIO);
310
311 /* force to stop the timer */
312 snd_timer_stop(timeri);
313
314 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
315 /* wait, until the active callback is finished */
316 spin_lock_irq(&slave_active_lock);
317 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
318 spin_unlock_irq(&slave_active_lock);
319 udelay(10);
320 spin_lock_irq(&slave_active_lock);
321 }
322 spin_unlock_irq(&slave_active_lock);
1a60d4c5 323 mutex_lock(&register_mutex);
1da177e4 324 list_del(&timeri->open_list);
1a60d4c5 325 mutex_unlock(&register_mutex);
1da177e4
LT		 326 } else {
327 timer = timeri->timer;
328 /* wait, until the active callback is finished */
329 spin_lock_irq(&timer->lock);
330 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
331 spin_unlock_irq(&timer->lock);
332 udelay(10);
333 spin_lock_irq(&timer->lock);
334 }
335 spin_unlock_irq(&timer->lock);
1a60d4c5 336 mutex_lock(&register_mutex);
1da177e4 337 list_del(&timeri->open_list);
6b172a85
CL		 338 if (timer && list_empty(&timer->open_list_head) &&
339 timer->hw.close)
1da177e4
LT		 340 timer->hw.close(timer);
341 /* remove slave links */
9244b2c3
JB		 342 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
343 open_list) {
1da177e4
LT		 344 spin_lock_irq(&slave_active_lock);
345 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
9244b2c3 346 list_move_tail(&slave->open_list, &snd_timer_slave_list);
1da177e4
LT		 347 slave->master = NULL;
348 slave->timer = NULL;
349 spin_unlock_irq(&slave_active_lock);
350 }
1a60d4c5 351 mutex_unlock(&register_mutex);
1da177e4
LT		 352 }
353 if (timeri->private_free)
354 timeri->private_free(timeri);
355 kfree(timeri->owner);
356 kfree(timeri);
de24214d
CL		 357 if (timer)
358 module_put(timer->module);
1da177e4
LT		 359 return 0;
360}
361
53d2f744 362unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
1da177e4 363{
53d2f744 364 struct snd_timer * timer;
1da177e4
LT		 365
366 if (timeri == NULL)
367 return 0;
368 if ((timer = timeri->timer) != NULL) {
369 if (timer->hw.c_resolution)
370 return timer->hw.c_resolution(timer);
371 return timer->hw.resolution;
372 }
373 return 0;
374}
375
53d2f744 376static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
1da177e4 377{
53d2f744 378 struct snd_timer *timer;
1da177e4
LT		 379 unsigned long flags;
380 unsigned long resolution = 0;
53d2f744 381 struct snd_timer_instance *ts;
1da177e4
LT		 382 struct timespec tstamp;
383
07799e75 384 getnstimeofday(&tstamp);
6b172a85
CL		 385 snd_assert(event >= SNDRV_TIMER_EVENT_START &&
386 event <= SNDRV_TIMER_EVENT_PAUSE, return);
387 if (event == SNDRV_TIMER_EVENT_START ||
388 event == SNDRV_TIMER_EVENT_CONTINUE)
1da177e4
LT		 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);
9244b2c3 400 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1da177e4
LT		 401 if (ts->ccallback)
402 ts->ccallback(ti, event + 100, &tstamp, resolution);
1da177e4
LT		 403 spin_unlock_irqrestore(&timer->lock, flags);
404}
405
53d2f744 406static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
6b172a85 407 unsigned long sticks)
1da177e4
LT		 408{
409 list_del(&timeri->active_list);
410 list_add_tail(&timeri->active_list, &timer->active_list_head);
411 if (timer->running) {
412 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
413 goto __start_now;
414 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
415 timeri->flags |= SNDRV_TIMER_IFLG_START;
416 return 1; /* delayed start */
417 } else {
418 timer->sticks = sticks;
419 timer->hw.start(timer);
420 __start_now:
421 timer->running++;
422 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
423 return 0;
424 }
425}
426
53d2f744 427static int snd_timer_start_slave(struct snd_timer_instance *timeri)
1da177e4
LT		 428{
429 unsigned long flags;
430
431 spin_lock_irqsave(&slave_active_lock, flags);
432 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
433 if (timeri->master)
6b172a85
CL		 434 list_add_tail(&timeri->active_list,
435 &timeri->master->slave_active_head);
1da177e4
LT		 436 spin_unlock_irqrestore(&slave_active_lock, flags);
437 return 1; /* delayed start */
438}
439
440/*
441 * start the timer instance
6b172a85 442 */
53d2f744 443int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
1da177e4 444{
53d2f744 445 struct snd_timer *timer;
1da177e4
LT		 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
53d2f744
TI		 468static int _snd_timer_stop(struct snd_timer_instance * timeri,
469 int keep_flag, int event)
1da177e4 470{
53d2f744 471 struct snd_timer *timer;
1da177e4
LT		 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)
6b172a85
CL		 503 timeri->flags &=
504 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
1da177e4
LT		 505 spin_unlock_irqrestore(&timer->lock, flags);
506 __end:
507 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
508 snd_timer_notify1(timeri, event);
509 return 0;
510}
511
512/*
513 * stop the timer instance.
514 *
515 * do not call this from the timer callback!
516 */
53d2f744 517int snd_timer_stop(struct snd_timer_instance *timeri)
1da177e4 518{
53d2f744 519 struct snd_timer *timer;
1da177e4
LT		 520 unsigned long flags;
521 int err;
522
523 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
524 if (err < 0)
525 return err;
526 timer = timeri->timer;
527 spin_lock_irqsave(&timer->lock, flags);
528 timeri->cticks = timeri->ticks;
529 timeri->pticks = 0;
530 spin_unlock_irqrestore(&timer->lock, flags);
531 return 0;
532}
533
534/*
535 * start again.. the tick is kept.
536 */
53d2f744 537int snd_timer_continue(struct snd_timer_instance *timeri)
1da177e4 538{
53d2f744 539 struct snd_timer *timer;
1da177e4
LT		 540 int result = -EINVAL;
541 unsigned long flags;
542
543 if (timeri == NULL)
544 return result;
545 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
546 return snd_timer_start_slave(timeri);
547 timer = timeri->timer;
548 if (! timer)
549 return -EINVAL;
550 spin_lock_irqsave(&timer->lock, flags);
551 if (!timeri->cticks)
552 timeri->cticks = 1;
553 timeri->pticks = 0;
554 result = snd_timer_start1(timer, timeri, timer->sticks);
555 spin_unlock_irqrestore(&timer->lock, flags);
556 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
557 return result;
558}
559
560/*
561 * pause.. remember the ticks left
562 */
53d2f744 563int snd_timer_pause(struct snd_timer_instance * timeri)
1da177e4
LT		 564{
565 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
566}
567
568/*
569 * reschedule the timer
570 *
571 * start pending instances and check the scheduling ticks.
572 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
573 */
53d2f744 574static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
1da177e4 575{
53d2f744 576 struct snd_timer_instance *ti;
1da177e4 577 unsigned long ticks = ~0UL;
1da177e4 578
9244b2c3 579 list_for_each_entry(ti, &timer->active_list_head, active_list) {
1da177e4
LT		 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 */
605static void snd_timer_tasklet(unsigned long arg)
606{
53d2f744
TI		 607 struct snd_timer *timer = (struct snd_timer *) arg;
608 struct snd_timer_instance *ti;
1da177e4
LT		 609 struct list_head *p;
610 unsigned long resolution, ticks;
2999ff5b 611 unsigned long flags;
1da177e4 612
2999ff5b 613 spin_lock_irqsave(&timer->lock, flags);
1da177e4
LT		 614 /* now process all callbacks */
615 while (!list_empty(&timer->sack_list_head)) {
616 p = timer->sack_list_head.next; /* get first item */
53d2f744 617 ti = list_entry(p, struct snd_timer_instance, ack_list);
1da177e4
LT		 618
619 /* remove from ack_list and make empty */
620 list_del_init(p);
6b172a85 621
1da177e4
LT		 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 }
2999ff5b 633 spin_unlock_irqrestore(&timer->lock, flags);
1da177e4
LT		 634}
635
636/*
637 * timer interrupt
638 *
639 * ticks_left is usually equal to timer->sticks.
640 *
641 */
53d2f744 642void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
1da177e4 643{
9244b2c3 644 struct snd_timer_instance *ti, *ts, *tmp;
1da177e4 645 unsigned long resolution, ticks;
9244b2c3 646 struct list_head *p, *ack_list_head;
b32425ac 647 unsigned long flags;
1da177e4
LT		 648 int use_tasklet = 0;
649
650 if (timer == NULL)
651 return;
652
b32425ac 653 spin_lock_irqsave(&timer->lock, flags);
1da177e4
LT		 654
655 /* remember the current resolution */
656 if (timer->hw.c_resolution)
657 resolution = timer->hw.c_resolution(timer);
658 else
659 resolution = timer->hw.resolution;
660
661 /* loop for all active instances
9244b2c3 662 * Here we cannot use list_for_each_entry because the active_list of a
6b172a85
CL		 663 * processed instance is relinked to done_list_head before the callback
664 * is called.
1da177e4 665 */
9244b2c3
JB		 666 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
667 active_list) {
1da177e4
LT		 668 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
669 continue;
670 ti->pticks += ticks_left;
671 ti->resolution = resolution;
672 if (ti->cticks < ticks_left)
673 ti->cticks = 0;
674 else
675 ti->cticks -= ticks_left;
676 if (ti->cticks) /* not expired */
677 continue;
678 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
679 ti->cticks = ti->ticks;
680 } else {
681 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
682 if (--timer->running)
9244b2c3 683 list_del(&ti->active_list);
1da177e4 684 }
6b172a85
CL		 685 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
686 (ti->flags & SNDRV_TIMER_IFLG_FAST))
687 ack_list_head = &timer->ack_list_head;
688 else
689 ack_list_head = &timer->sack_list_head;
690 if (list_empty(&ti->ack_list))
691 list_add_tail(&ti->ack_list, ack_list_head);
9244b2c3 692 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
1da177e4
LT		 693 ts->pticks = ti->pticks;
694 ts->resolution = resolution;
6b172a85
CL		 695 if (list_empty(&ts->ack_list))
696 list_add_tail(&ts->ack_list, ack_list_head);
1da177e4
LT		 697 }
698 }
699 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
cd93fe47 700 snd_timer_reschedule(timer, timer->sticks);
1da177e4
LT		 701 if (timer->running) {
702 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
703 timer->hw.stop(timer);
704 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
705 }
706 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
707 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
708 /* restart timer */
709 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
710 timer->hw.start(timer);
711 }
712 } else {
713 timer->hw.stop(timer);
714 }
715
716 /* now process all fast callbacks */
717 while (!list_empty(&timer->ack_list_head)) {
718 p = timer->ack_list_head.next; /* get first item */
53d2f744 719 ti = list_entry(p, struct snd_timer_instance, ack_list);
6b172a85 720
1da177e4
LT		 721 /* remove from ack_list and make empty */
722 list_del_init(p);
6b172a85 723
1da177e4
LT		 724 ticks = ti->pticks;
725 ti->pticks = 0;
726
727 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
728 spin_unlock(&timer->lock);
729 if (ti->callback)
730 ti->callback(ti, resolution, ticks);
731 spin_lock(&timer->lock);
732 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
733 }
734
735 /* do we have any slow callbacks? */
736 use_tasklet = !list_empty(&timer->sack_list_head);
b32425ac 737 spin_unlock_irqrestore(&timer->lock, flags);
1da177e4
LT		 738
739 if (use_tasklet)
740 tasklet_hi_schedule(&timer->task_queue);
741}
742
743/*
744
745 */
746
53d2f744
TI		 747int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
748 struct snd_timer **rtimer)
1da177e4 749{
53d2f744 750 struct snd_timer *timer;
1da177e4 751 int err;
53d2f744 752 static struct snd_device_ops ops = {
1da177e4
LT		 753 .dev_free = snd_timer_dev_free,
754 .dev_register = snd_timer_dev_register,
c461482c 755 .dev_disconnect = snd_timer_dev_disconnect,
1da177e4
LT		 756 };
757
758 snd_assert(tid != NULL, return -EINVAL);
759 snd_assert(rtimer != NULL, return -EINVAL);
760 *rtimer = NULL;
ca2c0966 761 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
73e77ba0
TI		 762 if (timer == NULL) {
763 snd_printk(KERN_ERR "timer: cannot allocate\n");
1da177e4 764 return -ENOMEM;
73e77ba0 765 }
1da177e4
LT		 766 timer->tmr_class = tid->dev_class;
767 timer->card = card;
768 timer->tmr_device = tid->device;
769 timer->tmr_subdevice = tid->subdevice;
770 if (id)
771 strlcpy(timer->id, id, sizeof(timer->id));
772 INIT_LIST_HEAD(&timer->device_list);
773 INIT_LIST_HEAD(&timer->open_list_head);
774 INIT_LIST_HEAD(&timer->active_list_head);
775 INIT_LIST_HEAD(&timer->ack_list_head);
776 INIT_LIST_HEAD(&timer->sack_list_head);
777 spin_lock_init(&timer->lock);
6b172a85
CL		 778 tasklet_init(&timer->task_queue, snd_timer_tasklet,
779 (unsigned long)timer);
1da177e4 780 if (card != NULL) {
de24214d 781 timer->module = card->module;
6b172a85
CL		 782 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
783 if (err < 0) {
1da177e4
LT		 784 snd_timer_free(timer);
785 return err;
786 }
787 }
788 *rtimer = timer;
789 return 0;
790}
791
53d2f744 792static int snd_timer_free(struct snd_timer *timer)
1da177e4
LT		 793{
794 snd_assert(timer != NULL, return -ENXIO);
c461482c
TI		 795
796 mutex_lock(&register_mutex);
797 if (! list_empty(&timer->open_list_head)) {
798 struct list_head *p, *n;
799 struct snd_timer_instance *ti;
800 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
801 list_for_each_safe(p, n, &timer->open_list_head) {
802 list_del_init(p);
803 ti = list_entry(p, struct snd_timer_instance, open_list);
804 ti->timer = NULL;
805 }
806 }
807 list_del(&timer->device_list);
808 mutex_unlock(&register_mutex);
809
1da177e4
LT		 810 if (timer->private_free)
811 timer->private_free(timer);
812 kfree(timer);
813 return 0;
814}
815
53d2f744 816static int snd_timer_dev_free(struct snd_device *device)
1da177e4 817{
53d2f744 818 struct snd_timer *timer = device->device_data;
1da177e4
LT		 819 return snd_timer_free(timer);
820}
821
53d2f744 822static int snd_timer_dev_register(struct snd_device *dev)
1da177e4 823{
53d2f744
TI		 824 struct snd_timer *timer = dev->device_data;
825 struct snd_timer *timer1;
1da177e4 826
6b172a85
CL		 827 snd_assert(timer != NULL && timer->hw.start != NULL &&
828 timer->hw.stop != NULL, return -ENXIO);
1da177e4
LT		 829 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
830 !timer->hw.resolution && timer->hw.c_resolution == NULL)
831 return -EINVAL;
832
1a60d4c5 833 mutex_lock(&register_mutex);
9244b2c3 834 list_for_each_entry(timer1, &snd_timer_list, device_list) {
1da177e4
LT		 835 if (timer1->tmr_class > timer->tmr_class)
836 break;
837 if (timer1->tmr_class < timer->tmr_class)
838 continue;
839 if (timer1->card && timer->card) {
840 if (timer1->card->number > timer->card->number)
841 break;
842 if (timer1->card->number < timer->card->number)
843 continue;
844 }
845 if (timer1->tmr_device > timer->tmr_device)
846 break;
847 if (timer1->tmr_device < timer->tmr_device)
848 continue;
849 if (timer1->tmr_subdevice > timer->tmr_subdevice)
850 break;
851 if (timer1->tmr_subdevice < timer->tmr_subdevice)
852 continue;
853 /* conflicts.. */
1a60d4c5 854 mutex_unlock(&register_mutex);
1da177e4
LT		 855 return -EBUSY;
856 }
9244b2c3 857 list_add_tail(&timer->device_list, &timer1->device_list);
1a60d4c5 858 mutex_unlock(&register_mutex);
1da177e4
LT		 859 return 0;
860}
861
c461482c 862static int snd_timer_dev_disconnect(struct snd_device *device)
1da177e4 863{
c461482c 864 struct snd_timer *timer = device->device_data;
1a60d4c5 865 mutex_lock(&register_mutex);
c461482c 866 list_del_init(&timer->device_list);
1a60d4c5 867 mutex_unlock(&register_mutex);
c461482c 868 return 0;
1da177e4
LT		 869}
870
53d2f744 871void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
1da177e4
LT		 872{
873 unsigned long flags;
874 unsigned long resolution = 0;
53d2f744 875 struct snd_timer_instance *ti, *ts;
1da177e4 876
7c22f1aa
TI		 877 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
878 return;
6b172a85
CL		 879 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART &&
880 event <= SNDRV_TIMER_EVENT_MRESUME, return);
1da177e4 881 spin_lock_irqsave(&timer->lock, flags);
a501dfa3
JK		 882 if (event == SNDRV_TIMER_EVENT_MSTART ||
883 event == SNDRV_TIMER_EVENT_MCONTINUE ||
884 event == SNDRV_TIMER_EVENT_MRESUME) {
1da177e4
LT		 885 if (timer->hw.c_resolution)
886 resolution = timer->hw.c_resolution(timer);
887 else
888 resolution = timer->hw.resolution;
889 }
9244b2c3 890 list_for_each_entry(ti, &timer->active_list_head, active_list) {
1da177e4
LT		 891 if (ti->ccallback)
892 ti->ccallback(ti, event, tstamp, resolution);
9244b2c3 893 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1da177e4
LT		 894 if (ts->ccallback)
895 ts->ccallback(ts, event, tstamp, resolution);
1da177e4
LT		 896 }
897 spin_unlock_irqrestore(&timer->lock, flags);
898}
899
900/*
901 * exported functions for global timers
902 */
53d2f744 903int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1da177e4 904{
53d2f744 905 struct snd_timer_id tid;
6b172a85 906
1da177e4
LT		 907 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
908 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
909 tid.card = -1;
910 tid.device = device;
911 tid.subdevice = 0;
912 return snd_timer_new(NULL, id, &tid, rtimer);
913}
914
53d2f744 915int snd_timer_global_free(struct snd_timer *timer)
1da177e4
LT		 916{
917 return snd_timer_free(timer);
918}
919
53d2f744 920int snd_timer_global_register(struct snd_timer *timer)
1da177e4 921{
53d2f744 922 struct snd_device dev;
1da177e4
LT		 923
924 memset(&dev, 0, sizeof(dev));
925 dev.device_data = timer;
926 return snd_timer_dev_register(&dev);
927}
928
6b172a85 929/*
1da177e4
LT		 930 * System timer
931 */
932
933struct snd_timer_system_private {
934 struct timer_list tlist;
1da177e4
LT		 935 unsigned long last_expires;
936 unsigned long last_jiffies;
937 unsigned long correction;
938};
939
1da177e4
LT		 940static void snd_timer_s_function(unsigned long data)
941{
53d2f744 942 struct snd_timer *timer = (struct snd_timer *)data;
1da177e4
LT		 943 struct snd_timer_system_private *priv = timer->private_data;
944 unsigned long jiff = jiffies;
945 if (time_after(jiff, priv->last_expires))
6ed5eff0 946 priv->correction += (long)jiff - (long)priv->last_expires;
1da177e4
LT		 947 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
948}
949
53d2f744 950static int snd_timer_s_start(struct snd_timer * timer)
1da177e4
LT		 951{
952 struct snd_timer_system_private *priv;
953 unsigned long njiff;
954
955 priv = (struct snd_timer_system_private *) timer->private_data;
956 njiff = (priv->last_jiffies = jiffies);
957 if (priv->correction > timer->sticks - 1) {
958 priv->correction -= timer->sticks - 1;
959 njiff++;
960 } else {
961 njiff += timer->sticks - priv->correction;
17f48ec3 962 priv->correction = 0;
1da177e4
LT		 963 }
964 priv->last_expires = priv->tlist.expires = njiff;
965 add_timer(&priv->tlist);
966 return 0;
967}
968
53d2f744 969static int snd_timer_s_stop(struct snd_timer * timer)
1da177e4
LT		 970{
971 struct snd_timer_system_private *priv;
972 unsigned long jiff;
973
974 priv = (struct snd_timer_system_private *) timer->private_data;
975 del_timer(&priv->tlist);
976 jiff = jiffies;
977 if (time_before(jiff, priv->last_expires))
978 timer->sticks = priv->last_expires - jiff;
979 else
980 timer->sticks = 1;
de2696d8 981 priv->correction = 0;
1da177e4
LT		 982 return 0;
983}
984
53d2f744 985static struct snd_timer_hardware snd_timer_system =
1da177e4
LT		 986{
987 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
988 .resolution = 1000000000L / HZ,
989 .ticks = 10000000L,
990 .start = snd_timer_s_start,
991 .stop = snd_timer_s_stop
992};
993
53d2f744 994static void snd_timer_free_system(struct snd_timer *timer)
1da177e4
LT		 995{
996 kfree(timer->private_data);
997}
998
999static int snd_timer_register_system(void)
1000{
53d2f744 1001 struct snd_timer *timer;
1da177e4
LT		 1002 struct snd_timer_system_private *priv;
1003 int err;
1004
6b172a85
CL		 1005 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1006 if (err < 0)
1da177e4
LT		 1007 return err;
1008 strcpy(timer->name, "system timer");
1009 timer->hw = snd_timer_system;
ca2c0966 1010 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1da177e4
LT		 1011 if (priv == NULL) {
1012 snd_timer_free(timer);
1013 return -ENOMEM;
1014 }
1015 init_timer(&priv->tlist);
1016 priv->tlist.function = snd_timer_s_function;
1017 priv->tlist.data = (unsigned long) timer;
1018 timer->private_data = priv;
1019 timer->private_free = snd_timer_free_system;
1020 return snd_timer_global_register(timer);
1021}
1022
e28563cc 1023#ifdef CONFIG_PROC_FS
1da177e4
LT		 1024/*
1025 * Info interface
1026 */
1027
53d2f744
TI		 1028static void snd_timer_proc_read(struct snd_info_entry *entry,
1029 struct snd_info_buffer *buffer)
1da177e4 1030{
53d2f744
TI		 1031 struct snd_timer *timer;
1032 struct snd_timer_instance *ti;
1da177e4 1033
1a60d4c5 1034 mutex_lock(&register_mutex);
9244b2c3 1035 list_for_each_entry(timer, &snd_timer_list, device_list) {
1da177e4
LT		 1036 switch (timer->tmr_class) {
1037 case SNDRV_TIMER_CLASS_GLOBAL:
1038 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1039 break;
1040 case SNDRV_TIMER_CLASS_CARD:
6b172a85
CL		 1041 snd_iprintf(buffer, "C%i-%i: ",
1042 timer->card->number, timer->tmr_device);
1da177e4
LT		 1043 break;
1044 case SNDRV_TIMER_CLASS_PCM:
6b172a85
CL		 1045 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1046 timer->tmr_device, timer->tmr_subdevice);
1da177e4
LT		 1047 break;
1048 default:
6b172a85
CL		 1049 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1050 timer->card ? timer->card->number : -1,
1051 timer->tmr_device, timer->tmr_subdevice);
1da177e4
LT		 1052 }
1053 snd_iprintf(buffer, "%s :", timer->name);
1054 if (timer->hw.resolution)
6b172a85
CL		 1055 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1056 timer->hw.resolution / 1000,
1057 timer->hw.resolution % 1000,
1058 timer->hw.ticks);
1da177e4
LT		 1059 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1060 snd_iprintf(buffer, " SLAVE");
1061 snd_iprintf(buffer, "\n");
9244b2c3 1062 list_for_each_entry(ti, &timer->open_list_head, open_list)
6b172a85
CL		 1063 snd_iprintf(buffer, " Client %s : %s\n",
1064 ti->owner ? ti->owner : "unknown",
1065 ti->flags & (SNDRV_TIMER_IFLG_START |
1066 SNDRV_TIMER_IFLG_RUNNING)
1067 ? "running" : "stopped");
1da177e4 1068 }
1a60d4c5 1069 mutex_unlock(&register_mutex);
1da177e4
LT		 1070}
1071
6581f4e7 1072static struct snd_info_entry *snd_timer_proc_entry;
e28563cc
TI		 1073
1074static void __init snd_timer_proc_init(void)
1075{
1076 struct snd_info_entry *entry;
1077
1078 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1079 if (entry != NULL) {
e28563cc
TI		 1080 entry->c.text.read = snd_timer_proc_read;
1081 if (snd_info_register(entry) < 0) {
1082 snd_info_free_entry(entry);
1083 entry = NULL;
1084 }
1085 }
1086 snd_timer_proc_entry = entry;
1087}
1088
1089static void __exit snd_timer_proc_done(void)
1090{
746d4a02 1091 snd_info_free_entry(snd_timer_proc_entry);
e28563cc
TI		 1092}
1093#else /* !CONFIG_PROC_FS */
1094#define snd_timer_proc_init()
1095#define snd_timer_proc_done()
1096#endif
1097
1da177e4
LT		 1098/*
1099 * USER SPACE interface
1100 */
1101
53d2f744 1102static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1da177e4
LT		 1103 unsigned long resolution,
1104 unsigned long ticks)
1105{
53d2f744
TI		 1106 struct snd_timer_user *tu = timeri->callback_data;
1107 struct snd_timer_read *r;
1da177e4 1108 int prev;
6b172a85 1109
1da177e4
LT		 1110 spin_lock(&tu->qlock);
1111 if (tu->qused > 0) {
1112 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1113 r = &tu->queue[prev];
1114 if (r->resolution == resolution) {
1115 r->ticks += ticks;
1116 goto __wake;
1117 }
1118 }
1119 if (tu->qused >= tu->queue_size) {
1120 tu->overrun++;
1121 } else {
1122 r = &tu->queue[tu->qtail++];
1123 tu->qtail %= tu->queue_size;
1124 r->resolution = resolution;
1125 r->ticks = ticks;
1126 tu->qused++;
1127 }
1128 __wake:
1129 spin_unlock(&tu->qlock);
1130 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1131 wake_up(&tu->qchange_sleep);
1132}
1133
53d2f744
TI		 1134static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1135 struct snd_timer_tread *tread)
1da177e4
LT		 1136{
1137 if (tu->qused >= tu->queue_size) {
1138 tu->overrun++;
1139 } else {
1140 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1141 tu->qtail %= tu->queue_size;
1142 tu->qused++;
1143 }
1144}
1145
53d2f744
TI		 1146static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1147 int event,
1da177e4
LT		 1148 struct timespec *tstamp,
1149 unsigned long resolution)
1150{
53d2f744
TI		 1151 struct snd_timer_user *tu = timeri->callback_data;
1152 struct snd_timer_tread r1;
1da177e4 1153
6b172a85
CL		 1154 if (event >= SNDRV_TIMER_EVENT_START &&
1155 event <= SNDRV_TIMER_EVENT_PAUSE)
1da177e4
LT		 1156 tu->tstamp = *tstamp;
1157 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1158 return;
1159 r1.event = event;
1160 r1.tstamp = *tstamp;
1161 r1.val = resolution;
1162 spin_lock(&tu->qlock);
1163 snd_timer_user_append_to_tqueue(tu, &r1);
1164 spin_unlock(&tu->qlock);
1165 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1166 wake_up(&tu->qchange_sleep);
1167}
1168
53d2f744 1169static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1da177e4
LT		 1170 unsigned long resolution,
1171 unsigned long ticks)
1172{
53d2f744
TI		 1173 struct snd_timer_user *tu = timeri->callback_data;
1174 struct snd_timer_tread *r, r1;
1da177e4
LT		 1175 struct timespec tstamp;
1176 int prev, append = 0;
1177
07799e75 1178 memset(&tstamp, 0, sizeof(tstamp));
1da177e4 1179 spin_lock(&tu->qlock);
6b172a85
CL		 1180 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1181 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1da177e4
LT		 1182 spin_unlock(&tu->qlock);
1183 return;
1184 }
1185 if (tu->last_resolution != resolution || ticks > 0)
07799e75 1186 getnstimeofday(&tstamp);
6b172a85
CL		 1187 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1188 tu->last_resolution != resolution) {
1da177e4
LT		 1189 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1190 r1.tstamp = tstamp;
1191 r1.val = resolution;
1192 snd_timer_user_append_to_tqueue(tu, &r1);
1193 tu->last_resolution = resolution;
1194 append++;
1195 }
1196 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1197 goto __wake;
1198 if (ticks == 0)
1199 goto __wake;
1200 if (tu->qused > 0) {
1201 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1202 r = &tu->tqueue[prev];
1203 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1204 r->tstamp = tstamp;
1205 r->val += ticks;
1206 append++;
1207 goto __wake;
1208 }
1209 }
1210 r1.event = SNDRV_TIMER_EVENT_TICK;
1211 r1.tstamp = tstamp;
1212 r1.val = ticks;
1213 snd_timer_user_append_to_tqueue(tu, &r1);
1214 append++;
1215 __wake:
1216 spin_unlock(&tu->qlock);
1217 if (append == 0)
1218 return;
1219 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1220 wake_up(&tu->qchange_sleep);
1221}
1222
1223static int snd_timer_user_open(struct inode *inode, struct file *file)
1224{
53d2f744 1225 struct snd_timer_user *tu;
6b172a85 1226
ca2c0966 1227 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1da177e4
LT		 1228 if (tu == NULL)
1229 return -ENOMEM;
1230 spin_lock_init(&tu->qlock);
1231 init_waitqueue_head(&tu->qchange_sleep);
1a60d4c5 1232 mutex_init(&tu->tread_sem);
1da177e4
LT		 1233 tu->ticks = 1;
1234 tu->queue_size = 128;
53d2f744 1235 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
6b172a85 1236 GFP_KERNEL);
1da177e4
LT		 1237 if (tu->queue == NULL) {
1238 kfree(tu);
1239 return -ENOMEM;
1240 }
1241 file->private_data = tu;
1242 return 0;
1243}
1244
1245static int snd_timer_user_release(struct inode *inode, struct file *file)
1246{
53d2f744 1247 struct snd_timer_user *tu;
1da177e4
LT		 1248
1249 if (file->private_data) {
1250 tu = file->private_data;
1251 file->private_data = NULL;
1252 fasync_helper(-1, file, 0, &tu->fasync);
1253 if (tu->timeri)
1254 snd_timer_close(tu->timeri);
1255 kfree(tu->queue);
1256 kfree(tu->tqueue);
1257 kfree(tu);
1258 }
1259 return 0;
1260}
1261
53d2f744 1262static void snd_timer_user_zero_id(struct snd_timer_id *id)
1da177e4
LT		 1263{
1264 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1265 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1266 id->card = -1;
1267 id->device = -1;
1268 id->subdevice = -1;
1269}
1270
53d2f744 1271static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1da177e4
LT		 1272{
1273 id->dev_class = timer->tmr_class;
1274 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1275 id->card = timer->card ? timer->card->number : -1;
1276 id->device = timer->tmr_device;
1277 id->subdevice = timer->tmr_subdevice;
1278}
1279
53d2f744 1280static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1da177e4 1281{
53d2f744
TI		 1282 struct snd_timer_id id;
1283 struct snd_timer *timer;
1da177e4 1284 struct list_head *p;
6b172a85 1285
1da177e4
LT		 1286 if (copy_from_user(&id, _tid, sizeof(id)))
1287 return -EFAULT;
1a60d4c5 1288 mutex_lock(&register_mutex);
1da177e4
LT		 1289 if (id.dev_class < 0) { /* first item */
1290 if (list_empty(&snd_timer_list))
1291 snd_timer_user_zero_id(&id);
1292 else {
9dfba380 1293 timer = list_entry(snd_timer_list.next,
53d2f744 1294 struct snd_timer, device_list);
1da177e4
LT		 1295 snd_timer_user_copy_id(&id, timer);
1296 }
1297 } else {
1298 switch (id.dev_class) {
1299 case SNDRV_TIMER_CLASS_GLOBAL:
1300 id.device = id.device < 0 ? 0 : id.device + 1;
1301 list_for_each(p, &snd_timer_list) {
53d2f744 1302 timer = list_entry(p, struct snd_timer, device_list);
1da177e4
LT		 1303 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1304 snd_timer_user_copy_id(&id, timer);
1305 break;
1306 }
1307 if (timer->tmr_device >= id.device) {
1308 snd_timer_user_copy_id(&id, timer);
1309 break;
1310 }
1311 }
1312 if (p == &snd_timer_list)
1313 snd_timer_user_zero_id(&id);
1314 break;
1315 case SNDRV_TIMER_CLASS_CARD:
1316 case SNDRV_TIMER_CLASS_PCM:
1317 if (id.card < 0) {
1318 id.card = 0;
1319 } else {
1320 if (id.card < 0) {
1321 id.card = 0;
1322 } else {
1323 if (id.device < 0) {
1324 id.device = 0;
1325 } else {
6b172a85
CL		 1326 if (id.subdevice < 0) {
1327 id.subdevice = 0;
1328 } else {
1329 id.subdevice++;
1330 }
1da177e4
LT		 1331 }
1332 }
1333 }
1334 list_for_each(p, &snd_timer_list) {
53d2f744 1335 timer = list_entry(p, struct snd_timer, device_list);
1da177e4
LT		 1336 if (timer->tmr_class > id.dev_class) {
1337 snd_timer_user_copy_id(&id, timer);
1338 break;
1339 }
1340 if (timer->tmr_class < id.dev_class)
1341 continue;
1342 if (timer->card->number > id.card) {
1343 snd_timer_user_copy_id(&id, timer);
1344 break;
1345 }
1346 if (timer->card->number < id.card)
1347 continue;
1348 if (timer->tmr_device > id.device) {
1349 snd_timer_user_copy_id(&id, timer);
1350 break;
1351 }
1352 if (timer->tmr_device < id.device)
1353 continue;
1354 if (timer->tmr_subdevice > id.subdevice) {
1355 snd_timer_user_copy_id(&id, timer);
1356 break;
1357 }
1358 if (timer->tmr_subdevice < id.subdevice)
1359 continue;
1360 snd_timer_user_copy_id(&id, timer);
1361 break;
1362 }
1363 if (p == &snd_timer_list)
1364 snd_timer_user_zero_id(&id);
1365 break;
1366 default:
1367 snd_timer_user_zero_id(&id);
1368 }
1369 }
1a60d4c5 1370 mutex_unlock(&register_mutex);
1da177e4
LT		 1371 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1372 return -EFAULT;
1373 return 0;
6b172a85 1374}
1da177e4 1375
6b172a85 1376static int snd_timer_user_ginfo(struct file *file,
53d2f744 1377 struct snd_timer_ginfo __user *_ginfo)
1da177e4 1378{
53d2f744
TI		 1379 struct snd_timer_ginfo *ginfo;
1380 struct snd_timer_id tid;
1381 struct snd_timer *t;
1da177e4
LT		 1382 struct list_head *p;
1383 int err = 0;
1384
1385 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL);
1386 if (! ginfo)
1387 return -ENOMEM;
1388 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) {
1389 kfree(ginfo);
1390 return -EFAULT;
1391 }
1392 tid = ginfo->tid;
1393 memset(ginfo, 0, sizeof(*ginfo));
1394 ginfo->tid = tid;
1a60d4c5 1395 mutex_lock(&register_mutex);
1da177e4
LT		 1396 t = snd_timer_find(&tid);
1397 if (t != NULL) {
1398 ginfo->card = t->card ? t->card->number : -1;
1399 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1400 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1401 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1402 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1403 ginfo->resolution = t->hw.resolution;
1404 if (t->hw.resolution_min > 0) {
1405 ginfo->resolution_min = t->hw.resolution_min;
1406 ginfo->resolution_max = t->hw.resolution_max;
1407 }
1408 list_for_each(p, &t->open_list_head) {
1409 ginfo->clients++;
1410 }
1411 } else {
1412 err = -ENODEV;
1413 }
1a60d4c5 1414 mutex_unlock(&register_mutex);
1da177e4
LT		 1415 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1416 err = -EFAULT;
1417 kfree(ginfo);
1418 return err;
1419}
1420
6b172a85 1421static int snd_timer_user_gparams(struct file *file,
53d2f744 1422 struct snd_timer_gparams __user *_gparams)
1da177e4 1423{
53d2f744
TI		 1424 struct snd_timer_gparams gparams;
1425 struct snd_timer *t;
1da177e4
LT		 1426 int err;
1427
1428 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1429 return -EFAULT;
1a60d4c5 1430 mutex_lock(&register_mutex);
1da177e4 1431 t = snd_timer_find(&gparams.tid);
6b172a85 1432 if (!t) {
1da177e4 1433 err = -ENODEV;
6b172a85
CL		 1434 goto _error;
1435 }
1436 if (!list_empty(&t->open_list_head)) {
1437 err = -EBUSY;
1438 goto _error;
1439 }
1440 if (!t->hw.set_period) {
1441 err = -ENOSYS;
1442 goto _error;
1da177e4 1443 }
6b172a85
CL		 1444 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1445_error:
1a60d4c5 1446 mutex_unlock(&register_mutex);
1da177e4
LT		 1447 return err;
1448}
1449
6b172a85 1450static int snd_timer_user_gstatus(struct file *file,
53d2f744 1451 struct snd_timer_gstatus __user *_gstatus)
1da177e4 1452{
53d2f744
TI		 1453 struct snd_timer_gstatus gstatus;
1454 struct snd_timer_id tid;
1455 struct snd_timer *t;
1da177e4
LT		 1456 int err = 0;
1457
1458 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1459 return -EFAULT;
1460 tid = gstatus.tid;
1461 memset(&gstatus, 0, sizeof(gstatus));
1462 gstatus.tid = tid;
1a60d4c5 1463 mutex_lock(&register_mutex);
1da177e4
LT		 1464 t = snd_timer_find(&tid);
1465 if (t != NULL) {
1466 if (t->hw.c_resolution)
1467 gstatus.resolution = t->hw.c_resolution(t);
1468 else
1469 gstatus.resolution = t->hw.resolution;
1470 if (t->hw.precise_resolution) {
6b172a85
CL		 1471 t->hw.precise_resolution(t, &gstatus.resolution_num,
1472 &gstatus.resolution_den);
1da177e4
LT		 1473 } else {
1474 gstatus.resolution_num = gstatus.resolution;
1475 gstatus.resolution_den = 1000000000uL;
1476 }
1477 } else {
1478 err = -ENODEV;
1479 }
1a60d4c5 1480 mutex_unlock(&register_mutex);
1da177e4
LT		 1481 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1482 err = -EFAULT;
1483 return err;
1484}
1485
6b172a85 1486static int snd_timer_user_tselect(struct file *file,
53d2f744 1487 struct snd_timer_select __user *_tselect)
1da177e4 1488{
53d2f744
TI		 1489 struct snd_timer_user *tu;
1490 struct snd_timer_select tselect;
1da177e4 1491 char str[32];
c1935b4d 1492 int err = 0;
6b172a85 1493
1da177e4 1494 tu = file->private_data;
1a60d4c5 1495 mutex_lock(&tu->tread_sem);
c1935b4d 1496 if (tu->timeri) {
1da177e4 1497 snd_timer_close(tu->timeri);
c1935b4d
JK		 1498 tu->timeri = NULL;
1499 }
1500 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1501 err = -EFAULT;
1502 goto __err;
1503 }
1da177e4
LT		 1504 sprintf(str, "application %i", current->pid);
1505 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1506 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
6b172a85
CL		 1507 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1508 if (err < 0)
c1935b4d 1509 goto __err;
1da177e4 1510
4d572776
JJ		 1511 kfree(tu->queue);
1512 tu->queue = NULL;
1513 kfree(tu->tqueue);
1514 tu->tqueue = NULL;
1da177e4 1515 if (tu->tread) {
53d2f744 1516 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
6b172a85 1517 GFP_KERNEL);
c1935b4d
JK		 1518 if (tu->tqueue == NULL)
1519 err = -ENOMEM;
1da177e4 1520 } else {
53d2f744 1521 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
6b172a85 1522 GFP_KERNEL);
c1935b4d
JK		 1523 if (tu->queue == NULL)
1524 err = -ENOMEM;
1da177e4 1525 }
6b172a85 1526
c1935b4d
JK		 1527 if (err < 0) {
1528 snd_timer_close(tu->timeri);
1529 tu->timeri = NULL;
1530 } else {
1531 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
6b172a85
CL		 1532 tu->timeri->callback = tu->tread
1533 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
c1935b4d
JK		 1534 tu->timeri->ccallback = snd_timer_user_ccallback;
1535 tu->timeri->callback_data = (void *)tu;
1536 }
1537
1538 __err:
1a60d4c5 1539 mutex_unlock(&tu->tread_sem);
c1935b4d 1540 return err;
1da177e4
LT		 1541}
1542
6b172a85 1543static int snd_timer_user_info(struct file *file,
53d2f744 1544 struct snd_timer_info __user *_info)
1da177e4 1545{
53d2f744
TI		 1546 struct snd_timer_user *tu;
1547 struct snd_timer_info *info;
1548 struct snd_timer *t;
1da177e4
LT		 1549 int err = 0;
1550
1551 tu = file->private_data;
7c64ec34
CL		 1552 if (!tu->timeri)
1553 return -EBADFD;
1da177e4 1554 t = tu->timeri->timer;
7c64ec34
CL		 1555 if (!t)
1556 return -EBADFD;
1da177e4 1557
ca2c0966 1558 info = kzalloc(sizeof(*info), GFP_KERNEL);
1da177e4
LT		 1559 if (! info)
1560 return -ENOMEM;
1561 info->card = t->card ? t->card->number : -1;
1562 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1563 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1564 strlcpy(info->id, t->id, sizeof(info->id));
1565 strlcpy(info->name, t->name, sizeof(info->name));
1566 info->resolution = t->hw.resolution;
1567 if (copy_to_user(_info, info, sizeof(*_info)))
1568 err = -EFAULT;
1569 kfree(info);
1570 return err;
1571}
1572
6b172a85 1573static int snd_timer_user_params(struct file *file,
53d2f744 1574 struct snd_timer_params __user *_params)
1da177e4 1575{
53d2f744
TI		 1576 struct snd_timer_user *tu;
1577 struct snd_timer_params params;
1578 struct snd_timer *t;
1579 struct snd_timer_read *tr;
1580 struct snd_timer_tread *ttr;
1da177e4 1581 int err;
6b172a85 1582
1da177e4 1583 tu = file->private_data;
7c64ec34
CL		 1584 if (!tu->timeri)
1585 return -EBADFD;
1da177e4 1586 t = tu->timeri->timer;
7c64ec34
CL		 1587 if (!t)
1588 return -EBADFD;
1da177e4
LT		 1589 if (copy_from_user(&params, _params, sizeof(params)))
1590 return -EFAULT;
1591 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1592 err = -EINVAL;
1593 goto _end;
1594 }
6b172a85
CL		 1595 if (params.queue_size > 0 &&
1596 (params.queue_size < 32 || params.queue_size > 1024)) {
1da177e4
LT		 1597 err = -EINVAL;
1598 goto _end;
1599 }
1600 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1601 (1<<SNDRV_TIMER_EVENT_TICK)|
1602 (1<<SNDRV_TIMER_EVENT_START)|
1603 (1<<SNDRV_TIMER_EVENT_STOP)|
1604 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1605 (1<<SNDRV_TIMER_EVENT_PAUSE)|
a501dfa3
JK		 1606 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1607 (1<<SNDRV_TIMER_EVENT_RESUME)|
1da177e4
LT		 1608 (1<<SNDRV_TIMER_EVENT_MSTART)|
1609 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1610 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
65d11d95
JK		 1611 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1612 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
a501dfa3 1613 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1da177e4
LT		 1614 err = -EINVAL;
1615 goto _end;
1616 }
1617 snd_timer_stop(tu->timeri);
1618 spin_lock_irq(&t->lock);
1619 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1620 SNDRV_TIMER_IFLG_EXCLUSIVE|
1621 SNDRV_TIMER_IFLG_EARLY_EVENT);
1622 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1623 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1624 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1625 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1626 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1627 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1628 spin_unlock_irq(&t->lock);
6b172a85
CL		 1629 if (params.queue_size > 0 &&
1630 (unsigned int)tu->queue_size != params.queue_size) {
1da177e4 1631 if (tu->tread) {
6b172a85
CL		 1632 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1633 GFP_KERNEL);
1da177e4
LT		 1634 if (ttr) {
1635 kfree(tu->tqueue);
1636 tu->queue_size = params.queue_size;
1637 tu->tqueue = ttr;
1638 }
1639 } else {
6b172a85
CL		 1640 tr = kmalloc(params.queue_size * sizeof(*tr),
1641 GFP_KERNEL);
1da177e4
LT		 1642 if (tr) {
1643 kfree(tu->queue);
1644 tu->queue_size = params.queue_size;
1645 tu->queue = tr;
1646 }
1647 }
1648 }
1649 tu->qhead = tu->qtail = tu->qused = 0;
1650 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1651 if (tu->tread) {
53d2f744 1652 struct snd_timer_tread tread;
1da177e4
LT		 1653 tread.event = SNDRV_TIMER_EVENT_EARLY;
1654 tread.tstamp.tv_sec = 0;
1655 tread.tstamp.tv_nsec = 0;
1656 tread.val = 0;
1657 snd_timer_user_append_to_tqueue(tu, &tread);
1658 } else {
53d2f744 1659 struct snd_timer_read *r = &tu->queue[0];
1da177e4
LT		 1660 r->resolution = 0;
1661 r->ticks = 0;
1662 tu->qused++;
1663 tu->qtail++;
1664 }
1da177e4
LT		 1665 }
1666 tu->filter = params.filter;
1667 tu->ticks = params.ticks;
1668 err = 0;
1669 _end:
1670 if (copy_to_user(_params, &params, sizeof(params)))
1671 return -EFAULT;
1672 return err;
1673}
1674
6b172a85 1675static int snd_timer_user_status(struct file *file,
53d2f744 1676 struct snd_timer_status __user *_status)
1da177e4 1677{
53d2f744
TI		 1678 struct snd_timer_user *tu;
1679 struct snd_timer_status status;
6b172a85 1680
1da177e4 1681 tu = file->private_data;
7c64ec34
CL		 1682 if (!tu->timeri)
1683 return -EBADFD;
1da177e4
LT		 1684 memset(&status, 0, sizeof(status));
1685 status.tstamp = tu->tstamp;
1686 status.resolution = snd_timer_resolution(tu->timeri);
1687 status.lost = tu->timeri->lost;
1688 status.overrun = tu->overrun;
1689 spin_lock_irq(&tu->qlock);
1690 status.queue = tu->qused;
1691 spin_unlock_irq(&tu->qlock);
1692 if (copy_to_user(_status, &status, sizeof(status)))
1693 return -EFAULT;
1694 return 0;
1695}
1696
1697static int snd_timer_user_start(struct file *file)
1698{
1699 int err;
53d2f744 1700 struct snd_timer_user *tu;
6b172a85 1701
1da177e4 1702 tu = file->private_data;
7c64ec34
CL		 1703 if (!tu->timeri)
1704 return -EBADFD;
1da177e4
LT		 1705 snd_timer_stop(tu->timeri);
1706 tu->timeri->lost = 0;
1707 tu->last_resolution = 0;
1708 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1709}
1710
1711static int snd_timer_user_stop(struct file *file)
1712{
1713 int err;
53d2f744 1714 struct snd_timer_user *tu;
6b172a85 1715
1da177e4 1716 tu = file->private_data;
7c64ec34
CL		 1717 if (!tu->timeri)
1718 return -EBADFD;
1da177e4
LT		 1719 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1720}
1721
1722static int snd_timer_user_continue(struct file *file)
1723{
1724 int err;
53d2f744 1725 struct snd_timer_user *tu;
6b172a85 1726
1da177e4 1727 tu = file->private_data;
7c64ec34
CL		 1728 if (!tu->timeri)
1729 return -EBADFD;
1da177e4
LT		 1730 tu->timeri->lost = 0;
1731 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1732}
1733
15790a6b
TI		 1734static int snd_timer_user_pause(struct file *file)
1735{
1736 int err;
53d2f744 1737 struct snd_timer_user *tu;
6b172a85 1738
15790a6b 1739 tu = file->private_data;
7c64ec34
CL		 1740 if (!tu->timeri)
1741 return -EBADFD;
d138b445 1742 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
15790a6b
TI		 1743}
1744
8c50b37c
TI		 1745enum {
1746 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1747 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1748 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1749 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1750};
1751
6b172a85
CL		 1752static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1753 unsigned long arg)
1da177e4 1754{
53d2f744 1755 struct snd_timer_user *tu;
1da177e4
LT		 1756 void __user *argp = (void __user *)arg;
1757 int __user *p = argp;
6b172a85 1758
1da177e4
LT		 1759 tu = file->private_data;
1760 switch (cmd) {
1761 case SNDRV_TIMER_IOCTL_PVERSION:
1762 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1763 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1764 return snd_timer_user_next_device(argp);
1765 case SNDRV_TIMER_IOCTL_TREAD:
1766 {
1767 int xarg;
6b172a85 1768
1a60d4c5 1769 mutex_lock(&tu->tread_sem);
c1935b4d 1770 if (tu->timeri) { /* too late */
1a60d4c5 1771 mutex_unlock(&tu->tread_sem);
1da177e4 1772 return -EBUSY;
c1935b4d
JK		 1773 }
1774 if (get_user(xarg, p)) {
1a60d4c5 1775 mutex_unlock(&tu->tread_sem);
1da177e4 1776 return -EFAULT;
c1935b4d 1777 }
1da177e4 1778 tu->tread = xarg ? 1 : 0;
1a60d4c5 1779 mutex_unlock(&tu->tread_sem);
1da177e4
LT		 1780 return 0;
1781 }
1782 case SNDRV_TIMER_IOCTL_GINFO:
1783 return snd_timer_user_ginfo(file, argp);
1784 case SNDRV_TIMER_IOCTL_GPARAMS:
1785 return snd_timer_user_gparams(file, argp);
1786 case SNDRV_TIMER_IOCTL_GSTATUS:
1787 return snd_timer_user_gstatus(file, argp);
1788 case SNDRV_TIMER_IOCTL_SELECT:
1789 return snd_timer_user_tselect(file, argp);
1790 case SNDRV_TIMER_IOCTL_INFO:
1791 return snd_timer_user_info(file, argp);
1792 case SNDRV_TIMER_IOCTL_PARAMS:
1793 return snd_timer_user_params(file, argp);
1794 case SNDRV_TIMER_IOCTL_STATUS:
1795 return snd_timer_user_status(file, argp);
1796 case SNDRV_TIMER_IOCTL_START:
8c50b37c 1797 case SNDRV_TIMER_IOCTL_START_OLD:
1da177e4
LT		 1798 return snd_timer_user_start(file);
1799 case SNDRV_TIMER_IOCTL_STOP:
8c50b37c 1800 case SNDRV_TIMER_IOCTL_STOP_OLD:
1da177e4
LT		 1801 return snd_timer_user_stop(file);
1802 case SNDRV_TIMER_IOCTL_CONTINUE:
8c50b37c 1803 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1da177e4 1804 return snd_timer_user_continue(file);
15790a6b 1805 case SNDRV_TIMER_IOCTL_PAUSE:
8c50b37c 1806 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
15790a6b 1807 return snd_timer_user_pause(file);
1da177e4
LT		 1808 }
1809 return -ENOTTY;
1810}
1811
1812static int snd_timer_user_fasync(int fd, struct file * file, int on)
1813{
53d2f744 1814 struct snd_timer_user *tu;
1da177e4 1815 int err;
6b172a85 1816
1da177e4
LT		 1817 tu = file->private_data;
1818 err = fasync_helper(fd, file, on, &tu->fasync);
1819 if (err < 0)
1820 return err;
1821 return 0;
1822}
1823
6b172a85
CL		 1824static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1825 size_t count, loff_t *offset)
1da177e4 1826{
53d2f744 1827 struct snd_timer_user *tu;
1da177e4
LT		 1828 long result = 0, unit;
1829 int err = 0;
6b172a85 1830
1da177e4 1831 tu = file->private_data;
53d2f744 1832 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
1da177e4
LT		 1833 spin_lock_irq(&tu->qlock);
1834 while ((long)count - result >= unit) {
1835 while (!tu->qused) {
1836 wait_queue_t wait;
1837
1838 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1839 err = -EAGAIN;
1840 break;
1841 }
1842
1843 set_current_state(TASK_INTERRUPTIBLE);
1844 init_waitqueue_entry(&wait, current);
1845 add_wait_queue(&tu->qchange_sleep, &wait);
1846
1847 spin_unlock_irq(&tu->qlock);
1848 schedule();
1849 spin_lock_irq(&tu->qlock);
1850
1851 remove_wait_queue(&tu->qchange_sleep, &wait);
1852
1853 if (signal_pending(current)) {
1854 err = -ERESTARTSYS;
1855 break;
1856 }
1857 }
1858
1859 spin_unlock_irq(&tu->qlock);
1860 if (err < 0)
1861 goto _error;
1862
1863 if (tu->tread) {
6b172a85 1864 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
53d2f744 1865 sizeof(struct snd_timer_tread))) {
1da177e4
LT		 1866 err = -EFAULT;
1867 goto _error;
1868 }
1869 } else {
6b172a85 1870 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
53d2f744 1871 sizeof(struct snd_timer_read))) {
1da177e4
LT		 1872 err = -EFAULT;
1873 goto _error;
1874 }
1875 }
1876
1877 tu->qhead %= tu->queue_size;
1878
1879 result += unit;
1880 buffer += unit;
1881
1882 spin_lock_irq(&tu->qlock);
1883 tu->qused--;
1884 }
1885 spin_unlock_irq(&tu->qlock);
1886 _error:
1887 return result > 0 ? result : err;
1888}
1889
1890static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1891{
1892 unsigned int mask;
53d2f744 1893 struct snd_timer_user *tu;
1da177e4
LT		 1894
1895 tu = file->private_data;
1896
1897 poll_wait(file, &tu->qchange_sleep, wait);
6b172a85 1898
1da177e4
LT		 1899 mask = 0;
1900 if (tu->qused)
1901 mask |= POLLIN | POLLRDNORM;
1902
1903 return mask;
1904}
1905
1906#ifdef CONFIG_COMPAT
1907#include "timer_compat.c"
1908#else
1909#define snd_timer_user_ioctl_compat NULL
1910#endif
1911
9c2e08c5 1912static const struct file_operations snd_timer_f_ops =
1da177e4
LT		 1913{
1914 .owner = THIS_MODULE,
1915 .read = snd_timer_user_read,
1916 .open = snd_timer_user_open,
1917 .release = snd_timer_user_release,
1918 .poll = snd_timer_user_poll,
1919 .unlocked_ioctl = snd_timer_user_ioctl,
1920 .compat_ioctl = snd_timer_user_ioctl_compat,
1921 .fasync = snd_timer_user_fasync,
1922};
1923
1da177e4
LT		 1924/*
1925 * ENTRY functions
1926 */
1927
1da177e4
LT		 1928static int __init alsa_timer_init(void)
1929{
1930 int err;
1da177e4
LT		 1931
1932#ifdef SNDRV_OSS_INFO_DEV_TIMERS
6b172a85
CL		 1933 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1934 "system timer");
1da177e4 1935#endif
e28563cc 1936
1da177e4 1937 if ((err = snd_timer_register_system()) < 0)
6b172a85
CL		 1938 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1939 err);
f87135f5
CL		 1940 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1941 &snd_timer_f_ops, NULL, "timer")) < 0)
6b172a85
CL		 1942 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1943 err);
e28563cc 1944 snd_timer_proc_init();
1da177e4
LT		 1945 return 0;
1946}
1947
1948static void __exit alsa_timer_exit(void)
1949{
1950 struct list_head *p, *n;
1951
1952 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1953 /* unregister the system timer */
1954 list_for_each_safe(p, n, &snd_timer_list) {
53d2f744 1955 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
c461482c 1956 snd_timer_free(timer);
1da177e4 1957 }
e28563cc 1958 snd_timer_proc_done();
1da177e4
LT		 1959#ifdef SNDRV_OSS_INFO_DEV_TIMERS
1960 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1961#endif
1962}
1963
1964module_init(alsa_timer_init)
1965module_exit(alsa_timer_exit)
1966
1967EXPORT_SYMBOL(snd_timer_open);
1968EXPORT_SYMBOL(snd_timer_close);
1969EXPORT_SYMBOL(snd_timer_resolution);
1970EXPORT_SYMBOL(snd_timer_start);
1971EXPORT_SYMBOL(snd_timer_stop);
1972EXPORT_SYMBOL(snd_timer_continue);
1973EXPORT_SYMBOL(snd_timer_pause);
1974EXPORT_SYMBOL(snd_timer_new);
1975EXPORT_SYMBOL(snd_timer_notify);
1976EXPORT_SYMBOL(snd_timer_global_new);
1977EXPORT_SYMBOL(snd_timer_global_free);
1978EXPORT_SYMBOL(snd_timer_global_register);
1da177e4 1979EXPORT_SYMBOL(snd_timer_interrupt);
Linux 6.x block layer and io_uring tree(s)