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mm: make wait_on_page_writeback() wait for multiple pending writebacks
[linux/fpc-iii.git] / sound / core / timer.c
blob765ea66665a8c5e4b19f3763ef73f48a1ce35ba4
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Timers abstract layer
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7 #include <linux/delay.h>
8 #include <linux/init.h>
9 #include <linux/slab.h>
10 #include <linux/time.h>
11 #include <linux/mutex.h>
12 #include <linux/device.h>
13 #include <linux/module.h>
14 #include <linux/string.h>
15 #include <linux/sched/signal.h>
16 #include <sound/core.h>
17 #include <sound/timer.h>
18 #include <sound/control.h>
19 #include <sound/info.h>
20 #include <sound/minors.h>
21 #include <sound/initval.h>
22 #include <linux/kmod.h>
23
24 /* internal flags */
25 #define SNDRV_TIMER_IFLG_PAUSED 0x00010000
26 #define SNDRV_TIMER_IFLG_DEAD 0x00020000
27
28 #if IS_ENABLED(CONFIG_SND_HRTIMER)
29 #define DEFAULT_TIMER_LIMIT 4
30 #else
31 #define DEFAULT_TIMER_LIMIT 1
32 #endif
33
34 static int timer_limit = DEFAULT_TIMER_LIMIT;
35 static int timer_tstamp_monotonic = 1;
36 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
37 MODULE_DESCRIPTION("ALSA timer interface");
38 MODULE_LICENSE("GPL");
39 module_param(timer_limit, int, 0444);
40 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
41 module_param(timer_tstamp_monotonic, int, 0444);
42 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
43
44 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
45 MODULE_ALIAS("devname:snd/timer");
46
47 enum timer_tread_format {
48 TREAD_FORMAT_NONE = 0,
49 TREAD_FORMAT_TIME64,
50 TREAD_FORMAT_TIME32,
51 };
52
53 struct snd_timer_tread32 {
54 int event;
55 s32 tstamp_sec;
56 s32 tstamp_nsec;
57 unsigned int val;
58 };
59
60 struct snd_timer_tread64 {
61 int event;
62 u8 pad1[4];
63 s64 tstamp_sec;
64 s64 tstamp_nsec;
65 unsigned int val;
66 u8 pad2[4];
67 };
68
69 struct snd_timer_user {
70 struct snd_timer_instance *timeri;
71 int tread; /* enhanced read with timestamps and events */
72 unsigned long ticks;
73 unsigned long overrun;
74 int qhead;
75 int qtail;
76 int qused;
77 int queue_size;
78 bool disconnected;
79 struct snd_timer_read *queue;
80 struct snd_timer_tread64 *tqueue;
81 spinlock_t qlock;
82 unsigned long last_resolution;
83 unsigned int filter;
84 struct timespec64 tstamp; /* trigger tstamp */
85 wait_queue_head_t qchange_sleep;
86 struct fasync_struct *fasync;
87 struct mutex ioctl_lock;
88 };
89
90 struct snd_timer_status32 {
91 s32 tstamp_sec; /* Timestamp - last update */
92 s32 tstamp_nsec;
93 unsigned int resolution; /* current period resolution in ns */
94 unsigned int lost; /* counter of master tick lost */
95 unsigned int overrun; /* count of read queue overruns */
96 unsigned int queue; /* used queue size */
97 unsigned char reserved[64]; /* reserved */
98 };
99
100 #define SNDRV_TIMER_IOCTL_STATUS32 _IOR('T', 0x14, struct snd_timer_status32)
101
102 struct snd_timer_status64 {
103 s64 tstamp_sec; /* Timestamp - last update */
104 s64 tstamp_nsec;
105 unsigned int resolution; /* current period resolution in ns */
106 unsigned int lost; /* counter of master tick lost */
107 unsigned int overrun; /* count of read queue overruns */
108 unsigned int queue; /* used queue size */
109 unsigned char reserved[64]; /* reserved */
110 };
111
112 #define SNDRV_TIMER_IOCTL_STATUS64 _IOR('T', 0x14, struct snd_timer_status64)
113
114 /* list of timers */
115 static LIST_HEAD(snd_timer_list);
116
117 /* list of slave instances */
118 static LIST_HEAD(snd_timer_slave_list);
119
120 /* lock for slave active lists */
121 static DEFINE_SPINLOCK(slave_active_lock);
122
123 #define MAX_SLAVE_INSTANCES 1000
124 static int num_slaves;
125
126 static DEFINE_MUTEX(register_mutex);
127
128 static int snd_timer_free(struct snd_timer *timer);
129 static int snd_timer_dev_free(struct snd_device *device);
130 static int snd_timer_dev_register(struct snd_device *device);
131 static int snd_timer_dev_disconnect(struct snd_device *device);
132
133 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
134
135 /*
136 * create a timer instance with the given owner string.
137 */
138 struct snd_timer_instance *snd_timer_instance_new(const char *owner)
139 {
140 struct snd_timer_instance *timeri;
141
142 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
143 if (timeri == NULL)
144 return NULL;
145 timeri->owner = kstrdup(owner, GFP_KERNEL);
146 if (! timeri->owner) {
147 kfree(timeri);
148 return NULL;
149 }
150 INIT_LIST_HEAD(&timeri->open_list);
151 INIT_LIST_HEAD(&timeri->active_list);
152 INIT_LIST_HEAD(&timeri->ack_list);
153 INIT_LIST_HEAD(&timeri->slave_list_head);
154 INIT_LIST_HEAD(&timeri->slave_active_head);
155
156 return timeri;
157 }
158 EXPORT_SYMBOL(snd_timer_instance_new);
159
160 void snd_timer_instance_free(struct snd_timer_instance *timeri)
161 {
162 if (timeri) {
163 if (timeri->private_free)
164 timeri->private_free(timeri);
165 kfree(timeri->owner);
166 kfree(timeri);
167 }
168 }
169 EXPORT_SYMBOL(snd_timer_instance_free);
170
171 /*
172 * find a timer instance from the given timer id
173 */
174 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
175 {
176 struct snd_timer *timer;
177
178 list_for_each_entry(timer, &snd_timer_list, device_list) {
179 if (timer->tmr_class != tid->dev_class)
180 continue;
181 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
182 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
183 (timer->card == NULL ||
184 timer->card->number != tid->card))
185 continue;
186 if (timer->tmr_device != tid->device)
187 continue;
188 if (timer->tmr_subdevice != tid->subdevice)
189 continue;
190 return timer;
191 }
192 return NULL;
193 }
194
195 #ifdef CONFIG_MODULES
196
197 static void snd_timer_request(struct snd_timer_id *tid)
198 {
199 switch (tid->dev_class) {
200 case SNDRV_TIMER_CLASS_GLOBAL:
201 if (tid->device < timer_limit)
202 request_module("snd-timer-%i", tid->device);
203 break;
204 case SNDRV_TIMER_CLASS_CARD:
205 case SNDRV_TIMER_CLASS_PCM:
206 if (tid->card < snd_ecards_limit)
207 request_module("snd-card-%i", tid->card);
208 break;
209 default:
210 break;
211 }
212 }
213
214 #endif
215
216 /* move the slave if it belongs to the master; return 1 if match */
217 static int check_matching_master_slave(struct snd_timer_instance *master,
218 struct snd_timer_instance *slave)
219 {
220 if (slave->slave_class != master->slave_class ||
221 slave->slave_id != master->slave_id)
222 return 0;
223 if (master->timer->num_instances >= master->timer->max_instances)
224 return -EBUSY;
225 list_move_tail(&slave->open_list, &master->slave_list_head);
226 master->timer->num_instances++;
227 spin_lock_irq(&slave_active_lock);
228 spin_lock(&master->timer->lock);
229 slave->master = master;
230 slave->timer = master->timer;
231 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
232 list_add_tail(&slave->active_list, &master->slave_active_head);
233 spin_unlock(&master->timer->lock);
234 spin_unlock_irq(&slave_active_lock);
235 return 1;
236 }
237
238 /*
239 * look for a master instance matching with the slave id of the given slave.
240 * when found, relink the open_link of the slave.
241 *
242 * call this with register_mutex down.
243 */
244 static int snd_timer_check_slave(struct snd_timer_instance *slave)
245 {
246 struct snd_timer *timer;
247 struct snd_timer_instance *master;
248 int err = 0;
249
250 /* FIXME: it's really dumb to look up all entries.. */
251 list_for_each_entry(timer, &snd_timer_list, device_list) {
252 list_for_each_entry(master, &timer->open_list_head, open_list) {
253 err = check_matching_master_slave(master, slave);
254 if (err != 0) /* match found or error */
255 goto out;
256 }
257 }
258 out:
259 return err < 0 ? err : 0;
260 }
261
262 /*
263 * look for slave instances matching with the slave id of the given master.
264 * when found, relink the open_link of slaves.
265 *
266 * call this with register_mutex down.
267 */
268 static int snd_timer_check_master(struct snd_timer_instance *master)
269 {
270 struct snd_timer_instance *slave, *tmp;
271 int err = 0;
272
273 /* check all pending slaves */
274 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
275 err = check_matching_master_slave(master, slave);
276 if (err < 0)
277 break;
278 }
279 return err < 0 ? err : 0;
280 }
281
282 static void snd_timer_close_locked(struct snd_timer_instance *timeri,
283 struct device **card_devp_to_put);
284
285 /*
286 * open a timer instance
287 * when opening a master, the slave id must be here given.
288 */
289 int snd_timer_open(struct snd_timer_instance *timeri,
290 struct snd_timer_id *tid,
291 unsigned int slave_id)
292 {
293 struct snd_timer *timer;
294 struct device *card_dev_to_put = NULL;
295 int err;
296
297 mutex_lock(&register_mutex);
298 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
299 /* open a slave instance */
300 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
301 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
302 pr_debug("ALSA: timer: invalid slave class %i\n",
303 tid->dev_sclass);
304 err = -EINVAL;
305 goto unlock;
306 }
307 if (num_slaves >= MAX_SLAVE_INSTANCES) {
308 err = -EBUSY;
309 goto unlock;
310 }
311 timeri->slave_class = tid->dev_sclass;
312 timeri->slave_id = tid->device;
313 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
314 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
315 num_slaves++;
316 err = snd_timer_check_slave(timeri);
317 goto list_added;
318 }
319
320 /* open a master instance */
321 timer = snd_timer_find(tid);
322 #ifdef CONFIG_MODULES
323 if (!timer) {
324 mutex_unlock(&register_mutex);
325 snd_timer_request(tid);
326 mutex_lock(&register_mutex);
327 timer = snd_timer_find(tid);
328 }
329 #endif
330 if (!timer) {
331 err = -ENODEV;
332 goto unlock;
333 }
334 if (!list_empty(&timer->open_list_head)) {
335 struct snd_timer_instance *t =
336 list_entry(timer->open_list_head.next,
337 struct snd_timer_instance, open_list);
338 if (t->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
339 err = -EBUSY;
340 goto unlock;
341 }
342 }
343 if (timer->num_instances >= timer->max_instances) {
344 err = -EBUSY;
345 goto unlock;
346 }
347 if (!try_module_get(timer->module)) {
348 err = -EBUSY;
349 goto unlock;
350 }
351 /* take a card refcount for safe disconnection */
352 if (timer->card) {
353 get_device(&timer->card->card_dev);
354 card_dev_to_put = &timer->card->card_dev;
355 }
356
357 if (list_empty(&timer->open_list_head) && timer->hw.open) {
358 err = timer->hw.open(timer);
359 if (err) {
360 module_put(timer->module);
361 goto unlock;
362 }
363 }
364
365 timeri->timer = timer;
366 timeri->slave_class = tid->dev_sclass;
367 timeri->slave_id = slave_id;
368
369 list_add_tail(&timeri->open_list, &timer->open_list_head);
370 timer->num_instances++;
371 err = snd_timer_check_master(timeri);
372 list_added:
373 if (err < 0)
374 snd_timer_close_locked(timeri, &card_dev_to_put);
375
376 unlock:
377 mutex_unlock(&register_mutex);
378 /* put_device() is called after unlock for avoiding deadlock */
379 if (err < 0 && card_dev_to_put)
380 put_device(card_dev_to_put);
381 return err;
382 }
383 EXPORT_SYMBOL(snd_timer_open);
384
385 /*
386 * close a timer instance
387 * call this with register_mutex down.
388 */
389 static void snd_timer_close_locked(struct snd_timer_instance *timeri,
390 struct device **card_devp_to_put)
391 {
392 struct snd_timer *timer = timeri->timer;
393 struct snd_timer_instance *slave, *tmp;
394
395 if (timer) {
396 spin_lock_irq(&timer->lock);
397 timeri->flags |= SNDRV_TIMER_IFLG_DEAD;
398 spin_unlock_irq(&timer->lock);
399 }
400
401 if (!list_empty(&timeri->open_list)) {
402 list_del_init(&timeri->open_list);
403 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
404 num_slaves--;
405 }
406
407 /* force to stop the timer */
408 snd_timer_stop(timeri);
409
410 if (timer) {
411 timer->num_instances--;
412 /* wait, until the active callback is finished */
413 spin_lock_irq(&timer->lock);
414 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
415 spin_unlock_irq(&timer->lock);
416 udelay(10);
417 spin_lock_irq(&timer->lock);
418 }
419 spin_unlock_irq(&timer->lock);
420
421 /* remove slave links */
422 spin_lock_irq(&slave_active_lock);
423 spin_lock(&timer->lock);
424 timeri->timer = NULL;
425 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
426 open_list) {
427 list_move_tail(&slave->open_list, &snd_timer_slave_list);
428 timer->num_instances--;
429 slave->master = NULL;
430 slave->timer = NULL;
431 list_del_init(&slave->ack_list);
432 list_del_init(&slave->active_list);
433 }
434 spin_unlock(&timer->lock);
435 spin_unlock_irq(&slave_active_lock);
436
437 /* slave doesn't need to release timer resources below */
438 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
439 timer = NULL;
440 }
441
442 if (timer) {
443 if (list_empty(&timer->open_list_head) && timer->hw.close)
444 timer->hw.close(timer);
445 /* release a card refcount for safe disconnection */
446 if (timer->card)
447 *card_devp_to_put = &timer->card->card_dev;
448 module_put(timer->module);
449 }
450 }
451
452 /*
453 * close a timer instance
454 */
455 void snd_timer_close(struct snd_timer_instance *timeri)
456 {
457 struct device *card_dev_to_put = NULL;
458
459 if (snd_BUG_ON(!timeri))
460 return;
461
462 mutex_lock(&register_mutex);
463 snd_timer_close_locked(timeri, &card_dev_to_put);
464 mutex_unlock(&register_mutex);
465 /* put_device() is called after unlock for avoiding deadlock */
466 if (card_dev_to_put)
467 put_device(card_dev_to_put);
468 }
469 EXPORT_SYMBOL(snd_timer_close);
470
471 static unsigned long snd_timer_hw_resolution(struct snd_timer *timer)
472 {
473 if (timer->hw.c_resolution)
474 return timer->hw.c_resolution(timer);
475 else
476 return timer->hw.resolution;
477 }
478
479 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
480 {
481 struct snd_timer * timer;
482 unsigned long ret = 0;
483 unsigned long flags;
484
485 if (timeri == NULL)
486 return 0;
487 timer = timeri->timer;
488 if (timer) {
489 spin_lock_irqsave(&timer->lock, flags);
490 ret = snd_timer_hw_resolution(timer);
491 spin_unlock_irqrestore(&timer->lock, flags);
492 }
493 return ret;
494 }
495 EXPORT_SYMBOL(snd_timer_resolution);
496
497 static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
498 {
499 struct snd_timer *timer = ti->timer;
500 unsigned long resolution = 0;
501 struct snd_timer_instance *ts;
502 struct timespec64 tstamp;
503
504 if (timer_tstamp_monotonic)
505 ktime_get_ts64(&tstamp);
506 else
507 ktime_get_real_ts64(&tstamp);
508 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
509 event > SNDRV_TIMER_EVENT_PAUSE))
510 return;
511 if (timer &&
512 (event == SNDRV_TIMER_EVENT_START ||
513 event == SNDRV_TIMER_EVENT_CONTINUE))
514 resolution = snd_timer_hw_resolution(timer);
515 if (ti->ccallback)
516 ti->ccallback(ti, event, &tstamp, resolution);
517 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
518 return;
519 if (timer == NULL)
520 return;
521 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
522 return;
523 list_for_each_entry(ts, &ti->slave_active_head, active_list)
524 if (ts->ccallback)
525 ts->ccallback(ts, event + 100, &tstamp, resolution);
526 }
527
528 /* start/continue a master timer */
529 static int snd_timer_start1(struct snd_timer_instance *timeri,
530 bool start, unsigned long ticks)
531 {
532 struct snd_timer *timer;
533 int result;
534 unsigned long flags;
535
536 timer = timeri->timer;
537 if (!timer)
538 return -EINVAL;
539
540 spin_lock_irqsave(&timer->lock, flags);
541 if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
542 result = -EINVAL;
543 goto unlock;
544 }
545 if (timer->card && timer->card->shutdown) {
546 result = -ENODEV;
547 goto unlock;
548 }
549 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
550 SNDRV_TIMER_IFLG_START)) {
551 result = -EBUSY;
552 goto unlock;
553 }
554
555 if (start)
556 timeri->ticks = timeri->cticks = ticks;
557 else if (!timeri->cticks)
558 timeri->cticks = 1;
559 timeri->pticks = 0;
560
561 list_move_tail(&timeri->active_list, &timer->active_list_head);
562 if (timer->running) {
563 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
564 goto __start_now;
565 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
566 timeri->flags |= SNDRV_TIMER_IFLG_START;
567 result = 1; /* delayed start */
568 } else {
569 if (start)
570 timer->sticks = ticks;
571 timer->hw.start(timer);
572 __start_now:
573 timer->running++;
574 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
575 result = 0;
576 }
577 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
578 SNDRV_TIMER_EVENT_CONTINUE);
579 unlock:
580 spin_unlock_irqrestore(&timer->lock, flags);
581 return result;
582 }
583
584 /* start/continue a slave timer */
585 static int snd_timer_start_slave(struct snd_timer_instance *timeri,
586 bool start)
587 {
588 unsigned long flags;
589 int err;
590
591 spin_lock_irqsave(&slave_active_lock, flags);
592 if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
593 err = -EINVAL;
594 goto unlock;
595 }
596 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
597 err = -EBUSY;
598 goto unlock;
599 }
600 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
601 if (timeri->master && timeri->timer) {
602 spin_lock(&timeri->timer->lock);
603 list_add_tail(&timeri->active_list,
604 &timeri->master->slave_active_head);
605 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
606 SNDRV_TIMER_EVENT_CONTINUE);
607 spin_unlock(&timeri->timer->lock);
608 }
609 err = 1; /* delayed start */
610 unlock:
611 spin_unlock_irqrestore(&slave_active_lock, flags);
612 return err;
613 }
614
615 /* stop/pause a master timer */
616 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
617 {
618 struct snd_timer *timer;
619 int result = 0;
620 unsigned long flags;
621
622 timer = timeri->timer;
623 if (!timer)
624 return -EINVAL;
625 spin_lock_irqsave(&timer->lock, flags);
626 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
627 SNDRV_TIMER_IFLG_START))) {
628 result = -EBUSY;
629 goto unlock;
630 }
631 list_del_init(&timeri->ack_list);
632 list_del_init(&timeri->active_list);
633 if (timer->card && timer->card->shutdown)
634 goto unlock;
635 if (stop) {
636 timeri->cticks = timeri->ticks;
637 timeri->pticks = 0;
638 }
639 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
640 !(--timer->running)) {
641 timer->hw.stop(timer);
642 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
643 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
644 snd_timer_reschedule(timer, 0);
645 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
646 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
647 timer->hw.start(timer);
648 }
649 }
650 }
651 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
652 if (stop)
653 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
654 else
655 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
656 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
657 SNDRV_TIMER_EVENT_PAUSE);
658 unlock:
659 spin_unlock_irqrestore(&timer->lock, flags);
660 return result;
661 }
662
663 /* stop/pause a slave timer */
664 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
665 {
666 unsigned long flags;
667
668 spin_lock_irqsave(&slave_active_lock, flags);
669 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
670 spin_unlock_irqrestore(&slave_active_lock, flags);
671 return -EBUSY;
672 }
673 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
674 if (timeri->timer) {
675 spin_lock(&timeri->timer->lock);
676 list_del_init(&timeri->ack_list);
677 list_del_init(&timeri->active_list);
678 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
679 SNDRV_TIMER_EVENT_PAUSE);
680 spin_unlock(&timeri->timer->lock);
681 }
682 spin_unlock_irqrestore(&slave_active_lock, flags);
683 return 0;
684 }
685
686 /*
687 * start the timer instance
688 */
689 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
690 {
691 if (timeri == NULL || ticks < 1)
692 return -EINVAL;
693 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
694 return snd_timer_start_slave(timeri, true);
695 else
696 return snd_timer_start1(timeri, true, ticks);
697 }
698 EXPORT_SYMBOL(snd_timer_start);
699
700 /*
701 * stop the timer instance.
702 *
703 * do not call this from the timer callback!
704 */
705 int snd_timer_stop(struct snd_timer_instance *timeri)
706 {
707 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
708 return snd_timer_stop_slave(timeri, true);
709 else
710 return snd_timer_stop1(timeri, true);
711 }
712 EXPORT_SYMBOL(snd_timer_stop);
713
714 /*
715 * start again.. the tick is kept.
716 */
717 int snd_timer_continue(struct snd_timer_instance *timeri)
718 {
719 /* timer can continue only after pause */
720 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
721 return -EINVAL;
722
723 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
724 return snd_timer_start_slave(timeri, false);
725 else
726 return snd_timer_start1(timeri, false, 0);
727 }
728 EXPORT_SYMBOL(snd_timer_continue);
729
730 /*
731 * pause.. remember the ticks left
732 */
733 int snd_timer_pause(struct snd_timer_instance * timeri)
734 {
735 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
736 return snd_timer_stop_slave(timeri, false);
737 else
738 return snd_timer_stop1(timeri, false);
739 }
740 EXPORT_SYMBOL(snd_timer_pause);
741
742 /*
743 * reschedule the timer
744 *
745 * start pending instances and check the scheduling ticks.
746 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
747 */
748 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
749 {
750 struct snd_timer_instance *ti;
751 unsigned long ticks = ~0UL;
752
753 list_for_each_entry(ti, &timer->active_list_head, active_list) {
754 if (ti->flags & SNDRV_TIMER_IFLG_START) {
755 ti->flags &= ~SNDRV_TIMER_IFLG_START;
756 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
757 timer->running++;
758 }
759 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
760 if (ticks > ti->cticks)
761 ticks = ti->cticks;
762 }
763 }
764 if (ticks == ~0UL) {
765 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
766 return;
767 }
768 if (ticks > timer->hw.ticks)
769 ticks = timer->hw.ticks;
770 if (ticks_left != ticks)
771 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
772 timer->sticks = ticks;
773 }
774
775 /* call callbacks in timer ack list */
776 static void snd_timer_process_callbacks(struct snd_timer *timer,
777 struct list_head *head)
778 {
779 struct snd_timer_instance *ti;
780 unsigned long resolution, ticks;
781
782 while (!list_empty(head)) {
783 ti = list_first_entry(head, struct snd_timer_instance,
784 ack_list);
785
786 /* remove from ack_list and make empty */
787 list_del_init(&ti->ack_list);
788
789 if (!(ti->flags & SNDRV_TIMER_IFLG_DEAD)) {
790 ticks = ti->pticks;
791 ti->pticks = 0;
792 resolution = ti->resolution;
793 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
794 spin_unlock(&timer->lock);
795 if (ti->callback)
796 ti->callback(ti, resolution, ticks);
797 spin_lock(&timer->lock);
798 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
799 }
800 }
801 }
802
803 /* clear pending instances from ack list */
804 static void snd_timer_clear_callbacks(struct snd_timer *timer,
805 struct list_head *head)
806 {
807 unsigned long flags;
808
809 spin_lock_irqsave(&timer->lock, flags);
810 while (!list_empty(head))
811 list_del_init(head->next);
812 spin_unlock_irqrestore(&timer->lock, flags);
813 }
814
815 /*
816 * timer work
817 *
818 */
819 static void snd_timer_work(struct work_struct *work)
820 {
821 struct snd_timer *timer = container_of(work, struct snd_timer, task_work);
822 unsigned long flags;
823
824 if (timer->card && timer->card->shutdown) {
825 snd_timer_clear_callbacks(timer, &timer->sack_list_head);
826 return;
827 }
828
829 spin_lock_irqsave(&timer->lock, flags);
830 snd_timer_process_callbacks(timer, &timer->sack_list_head);
831 spin_unlock_irqrestore(&timer->lock, flags);
832 }
833
834 /*
835 * timer interrupt
836 *
837 * ticks_left is usually equal to timer->sticks.
838 *
839 */
840 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
841 {
842 struct snd_timer_instance *ti, *ts, *tmp;
843 unsigned long resolution;
844 struct list_head *ack_list_head;
845 unsigned long flags;
846 bool use_work = false;
847
848 if (timer == NULL)
849 return;
850
851 if (timer->card && timer->card->shutdown) {
852 snd_timer_clear_callbacks(timer, &timer->ack_list_head);
853 return;
854 }
855
856 spin_lock_irqsave(&timer->lock, flags);
857
858 /* remember the current resolution */
859 resolution = snd_timer_hw_resolution(timer);
860
861 /* loop for all active instances
862 * Here we cannot use list_for_each_entry because the active_list of a
863 * processed instance is relinked to done_list_head before the callback
864 * is called.
865 */
866 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
867 active_list) {
868 if (ti->flags & SNDRV_TIMER_IFLG_DEAD)
869 continue;
870 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
871 continue;
872 ti->pticks += ticks_left;
873 ti->resolution = resolution;
874 if (ti->cticks < ticks_left)
875 ti->cticks = 0;
876 else
877 ti->cticks -= ticks_left;
878 if (ti->cticks) /* not expired */
879 continue;
880 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
881 ti->cticks = ti->ticks;
882 } else {
883 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
884 --timer->running;
885 list_del_init(&ti->active_list);
886 }
887 if ((timer->hw.flags & SNDRV_TIMER_HW_WORK) ||
888 (ti->flags & SNDRV_TIMER_IFLG_FAST))
889 ack_list_head = &timer->ack_list_head;
890 else
891 ack_list_head = &timer->sack_list_head;
892 if (list_empty(&ti->ack_list))
893 list_add_tail(&ti->ack_list, ack_list_head);
894 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
895 ts->pticks = ti->pticks;
896 ts->resolution = resolution;
897 if (list_empty(&ts->ack_list))
898 list_add_tail(&ts->ack_list, ack_list_head);
899 }
900 }
901 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
902 snd_timer_reschedule(timer, timer->sticks);
903 if (timer->running) {
904 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
905 timer->hw.stop(timer);
906 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
907 }
908 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
909 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
910 /* restart timer */
911 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
912 timer->hw.start(timer);
913 }
914 } else {
915 timer->hw.stop(timer);
916 }
917
918 /* now process all fast callbacks */
919 snd_timer_process_callbacks(timer, &timer->ack_list_head);
920
921 /* do we have any slow callbacks? */
922 use_work = !list_empty(&timer->sack_list_head);
923 spin_unlock_irqrestore(&timer->lock, flags);
924
925 if (use_work)
926 queue_work(system_highpri_wq, &timer->task_work);
927 }
928 EXPORT_SYMBOL(snd_timer_interrupt);
929
930 /*
931
932 */
933
934 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
935 struct snd_timer **rtimer)
936 {
937 struct snd_timer *timer;
938 int err;
939 static const struct snd_device_ops ops = {
940 .dev_free = snd_timer_dev_free,
941 .dev_register = snd_timer_dev_register,
942 .dev_disconnect = snd_timer_dev_disconnect,
943 };
944
945 if (snd_BUG_ON(!tid))
946 return -EINVAL;
947 if (tid->dev_class == SNDRV_TIMER_CLASS_CARD ||
948 tid->dev_class == SNDRV_TIMER_CLASS_PCM) {
949 if (WARN_ON(!card))
950 return -EINVAL;
951 }
952 if (rtimer)
953 *rtimer = NULL;
954 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
955 if (!timer)
956 return -ENOMEM;
957 timer->tmr_class = tid->dev_class;
958 timer->card = card;
959 timer->tmr_device = tid->device;
960 timer->tmr_subdevice = tid->subdevice;
961 if (id)
962 strlcpy(timer->id, id, sizeof(timer->id));
963 timer->sticks = 1;
964 INIT_LIST_HEAD(&timer->device_list);
965 INIT_LIST_HEAD(&timer->open_list_head);
966 INIT_LIST_HEAD(&timer->active_list_head);
967 INIT_LIST_HEAD(&timer->ack_list_head);
968 INIT_LIST_HEAD(&timer->sack_list_head);
969 spin_lock_init(&timer->lock);
970 INIT_WORK(&timer->task_work, snd_timer_work);
971 timer->max_instances = 1000; /* default limit per timer */
972 if (card != NULL) {
973 timer->module = card->module;
974 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
975 if (err < 0) {
976 snd_timer_free(timer);
977 return err;
978 }
979 }
980 if (rtimer)
981 *rtimer = timer;
982 return 0;
983 }
984 EXPORT_SYMBOL(snd_timer_new);
985
986 static int snd_timer_free(struct snd_timer *timer)
987 {
988 if (!timer)
989 return 0;
990
991 mutex_lock(&register_mutex);
992 if (! list_empty(&timer->open_list_head)) {
993 struct list_head *p, *n;
994 struct snd_timer_instance *ti;
995 pr_warn("ALSA: timer %p is busy?\n", timer);
996 list_for_each_safe(p, n, &timer->open_list_head) {
997 list_del_init(p);
998 ti = list_entry(p, struct snd_timer_instance, open_list);
999 ti->timer = NULL;
1000 }
1001 }
1002 list_del(&timer->device_list);
1003 mutex_unlock(&register_mutex);
1004
1005 if (timer->private_free)
1006 timer->private_free(timer);
1007 kfree(timer);
1008 return 0;
1009 }
1010
1011 static int snd_timer_dev_free(struct snd_device *device)
1012 {
1013 struct snd_timer *timer = device->device_data;
1014 return snd_timer_free(timer);
1015 }
1016
1017 static int snd_timer_dev_register(struct snd_device *dev)
1018 {
1019 struct snd_timer *timer = dev->device_data;
1020 struct snd_timer *timer1;
1021
1022 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
1023 return -ENXIO;
1024 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
1025 !timer->hw.resolution && timer->hw.c_resolution == NULL)
1026 return -EINVAL;
1027
1028 mutex_lock(&register_mutex);
1029 list_for_each_entry(timer1, &snd_timer_list, device_list) {
1030 if (timer1->tmr_class > timer->tmr_class)
1031 break;
1032 if (timer1->tmr_class < timer->tmr_class)
1033 continue;
1034 if (timer1->card && timer->card) {
1035 if (timer1->card->number > timer->card->number)
1036 break;
1037 if (timer1->card->number < timer->card->number)
1038 continue;
1039 }
1040 if (timer1->tmr_device > timer->tmr_device)
1041 break;
1042 if (timer1->tmr_device < timer->tmr_device)
1043 continue;
1044 if (timer1->tmr_subdevice > timer->tmr_subdevice)
1045 break;
1046 if (timer1->tmr_subdevice < timer->tmr_subdevice)
1047 continue;
1048 /* conflicts.. */
1049 mutex_unlock(&register_mutex);
1050 return -EBUSY;
1051 }
1052 list_add_tail(&timer->device_list, &timer1->device_list);
1053 mutex_unlock(&register_mutex);
1054 return 0;
1055 }
1056
1057 static int snd_timer_dev_disconnect(struct snd_device *device)
1058 {
1059 struct snd_timer *timer = device->device_data;
1060 struct snd_timer_instance *ti;
1061
1062 mutex_lock(&register_mutex);
1063 list_del_init(&timer->device_list);
1064 /* wake up pending sleepers */
1065 list_for_each_entry(ti, &timer->open_list_head, open_list) {
1066 if (ti->disconnect)
1067 ti->disconnect(ti);
1068 }
1069 mutex_unlock(&register_mutex);
1070 return 0;
1071 }
1072
1073 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tstamp)
1074 {
1075 unsigned long flags;
1076 unsigned long resolution = 0;
1077 struct snd_timer_instance *ti, *ts;
1078
1079 if (timer->card && timer->card->shutdown)
1080 return;
1081 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
1082 return;
1083 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
1084 event > SNDRV_TIMER_EVENT_MRESUME))
1085 return;
1086 spin_lock_irqsave(&timer->lock, flags);
1087 if (event == SNDRV_TIMER_EVENT_MSTART ||
1088 event == SNDRV_TIMER_EVENT_MCONTINUE ||
1089 event == SNDRV_TIMER_EVENT_MRESUME)
1090 resolution = snd_timer_hw_resolution(timer);
1091 list_for_each_entry(ti, &timer->active_list_head, active_list) {
1092 if (ti->ccallback)
1093 ti->ccallback(ti, event, tstamp, resolution);
1094 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1095 if (ts->ccallback)
1096 ts->ccallback(ts, event, tstamp, resolution);
1097 }
1098 spin_unlock_irqrestore(&timer->lock, flags);
1099 }
1100 EXPORT_SYMBOL(snd_timer_notify);
1101
1102 /*
1103 * exported functions for global timers
1104 */
1105 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1106 {
1107 struct snd_timer_id tid;
1108
1109 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
1110 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1111 tid.card = -1;
1112 tid.device = device;
1113 tid.subdevice = 0;
1114 return snd_timer_new(NULL, id, &tid, rtimer);
1115 }
1116 EXPORT_SYMBOL(snd_timer_global_new);
1117
1118 int snd_timer_global_free(struct snd_timer *timer)
1119 {
1120 return snd_timer_free(timer);
1121 }
1122 EXPORT_SYMBOL(snd_timer_global_free);
1123
1124 int snd_timer_global_register(struct snd_timer *timer)
1125 {
1126 struct snd_device dev;
1127
1128 memset(&dev, 0, sizeof(dev));
1129 dev.device_data = timer;
1130 return snd_timer_dev_register(&dev);
1131 }
1132 EXPORT_SYMBOL(snd_timer_global_register);
1133
1134 /*
1135 * System timer
1136 */
1137
1138 struct snd_timer_system_private {
1139 struct timer_list tlist;
1140 struct snd_timer *snd_timer;
1141 unsigned long last_expires;
1142 unsigned long last_jiffies;
1143 unsigned long correction;
1144 };
1145
1146 static void snd_timer_s_function(struct timer_list *t)
1147 {
1148 struct snd_timer_system_private *priv = from_timer(priv, t,
1149 tlist);
1150 struct snd_timer *timer = priv->snd_timer;
1151 unsigned long jiff = jiffies;
1152 if (time_after(jiff, priv->last_expires))
1153 priv->correction += (long)jiff - (long)priv->last_expires;
1154 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1155 }
1156
1157 static int snd_timer_s_start(struct snd_timer * timer)
1158 {
1159 struct snd_timer_system_private *priv;
1160 unsigned long njiff;
1161
1162 priv = (struct snd_timer_system_private *) timer->private_data;
1163 njiff = (priv->last_jiffies = jiffies);
1164 if (priv->correction > timer->sticks - 1) {
1165 priv->correction -= timer->sticks - 1;
1166 njiff++;
1167 } else {
1168 njiff += timer->sticks - priv->correction;
1169 priv->correction = 0;
1170 }
1171 priv->last_expires = njiff;
1172 mod_timer(&priv->tlist, njiff);
1173 return 0;
1174 }
1175
1176 static int snd_timer_s_stop(struct snd_timer * timer)
1177 {
1178 struct snd_timer_system_private *priv;
1179 unsigned long jiff;
1180
1181 priv = (struct snd_timer_system_private *) timer->private_data;
1182 del_timer(&priv->tlist);
1183 jiff = jiffies;
1184 if (time_before(jiff, priv->last_expires))
1185 timer->sticks = priv->last_expires - jiff;
1186 else
1187 timer->sticks = 1;
1188 priv->correction = 0;
1189 return 0;
1190 }
1191
1192 static int snd_timer_s_close(struct snd_timer *timer)
1193 {
1194 struct snd_timer_system_private *priv;
1195
1196 priv = (struct snd_timer_system_private *)timer->private_data;
1197 del_timer_sync(&priv->tlist);
1198 return 0;
1199 }
1200
1201 static const struct snd_timer_hardware snd_timer_system =
1202 {
1203 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_WORK,
1204 .resolution = 1000000000L / HZ,
1205 .ticks = 10000000L,
1206 .close = snd_timer_s_close,
1207 .start = snd_timer_s_start,
1208 .stop = snd_timer_s_stop
1209 };
1210
1211 static void snd_timer_free_system(struct snd_timer *timer)
1212 {
1213 kfree(timer->private_data);
1214 }
1215
1216 static int snd_timer_register_system(void)
1217 {
1218 struct snd_timer *timer;
1219 struct snd_timer_system_private *priv;
1220 int err;
1221
1222 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1223 if (err < 0)
1224 return err;
1225 strcpy(timer->name, "system timer");
1226 timer->hw = snd_timer_system;
1227 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1228 if (priv == NULL) {
1229 snd_timer_free(timer);
1230 return -ENOMEM;
1231 }
1232 priv->snd_timer = timer;
1233 timer_setup(&priv->tlist, snd_timer_s_function, 0);
1234 timer->private_data = priv;
1235 timer->private_free = snd_timer_free_system;
1236 return snd_timer_global_register(timer);
1237 }
1238
1239 #ifdef CONFIG_SND_PROC_FS
1240 /*
1241 * Info interface
1242 */
1243
1244 static void snd_timer_proc_read(struct snd_info_entry *entry,
1245 struct snd_info_buffer *buffer)
1246 {
1247 struct snd_timer *timer;
1248 struct snd_timer_instance *ti;
1249
1250 mutex_lock(&register_mutex);
1251 list_for_each_entry(timer, &snd_timer_list, device_list) {
1252 if (timer->card && timer->card->shutdown)
1253 continue;
1254 switch (timer->tmr_class) {
1255 case SNDRV_TIMER_CLASS_GLOBAL:
1256 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1257 break;
1258 case SNDRV_TIMER_CLASS_CARD:
1259 snd_iprintf(buffer, "C%i-%i: ",
1260 timer->card->number, timer->tmr_device);
1261 break;
1262 case SNDRV_TIMER_CLASS_PCM:
1263 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1264 timer->tmr_device, timer->tmr_subdevice);
1265 break;
1266 default:
1267 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1268 timer->card ? timer->card->number : -1,
1269 timer->tmr_device, timer->tmr_subdevice);
1270 }
1271 snd_iprintf(buffer, "%s :", timer->name);
1272 if (timer->hw.resolution)
1273 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1274 timer->hw.resolution / 1000,
1275 timer->hw.resolution % 1000,
1276 timer->hw.ticks);
1277 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1278 snd_iprintf(buffer, " SLAVE");
1279 snd_iprintf(buffer, "\n");
1280 list_for_each_entry(ti, &timer->open_list_head, open_list)
1281 snd_iprintf(buffer, " Client %s : %s\n",
1282 ti->owner ? ti->owner : "unknown",
1283 (ti->flags & (SNDRV_TIMER_IFLG_START |
1284 SNDRV_TIMER_IFLG_RUNNING))
1285 ? "running" : "stopped");
1286 }
1287 mutex_unlock(&register_mutex);
1288 }
1289
1290 static struct snd_info_entry *snd_timer_proc_entry;
1291
1292 static void __init snd_timer_proc_init(void)
1293 {
1294 struct snd_info_entry *entry;
1295
1296 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1297 if (entry != NULL) {
1298 entry->c.text.read = snd_timer_proc_read;
1299 if (snd_info_register(entry) < 0) {
1300 snd_info_free_entry(entry);
1301 entry = NULL;
1302 }
1303 }
1304 snd_timer_proc_entry = entry;
1305 }
1306
1307 static void __exit snd_timer_proc_done(void)
1308 {
1309 snd_info_free_entry(snd_timer_proc_entry);
1310 }
1311 #else /* !CONFIG_SND_PROC_FS */
1312 #define snd_timer_proc_init()
1313 #define snd_timer_proc_done()
1314 #endif
1315
1316 /*
1317 * USER SPACE interface
1318 */
1319
1320 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1321 unsigned long resolution,
1322 unsigned long ticks)
1323 {
1324 struct snd_timer_user *tu = timeri->callback_data;
1325 struct snd_timer_read *r;
1326 int prev;
1327
1328 spin_lock(&tu->qlock);
1329 if (tu->qused > 0) {
1330 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1331 r = &tu->queue[prev];
1332 if (r->resolution == resolution) {
1333 r->ticks += ticks;
1334 goto __wake;
1335 }
1336 }
1337 if (tu->qused >= tu->queue_size) {
1338 tu->overrun++;
1339 } else {
1340 r = &tu->queue[tu->qtail++];
1341 tu->qtail %= tu->queue_size;
1342 r->resolution = resolution;
1343 r->ticks = ticks;
1344 tu->qused++;
1345 }
1346 __wake:
1347 spin_unlock(&tu->qlock);
1348 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1349 wake_up(&tu->qchange_sleep);
1350 }
1351
1352 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1353 struct snd_timer_tread64 *tread)
1354 {
1355 if (tu->qused >= tu->queue_size) {
1356 tu->overrun++;
1357 } else {
1358 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1359 tu->qtail %= tu->queue_size;
1360 tu->qused++;
1361 }
1362 }
1363
1364 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1365 int event,
1366 struct timespec64 *tstamp,
1367 unsigned long resolution)
1368 {
1369 struct snd_timer_user *tu = timeri->callback_data;
1370 struct snd_timer_tread64 r1;
1371 unsigned long flags;
1372
1373 if (event >= SNDRV_TIMER_EVENT_START &&
1374 event <= SNDRV_TIMER_EVENT_PAUSE)
1375 tu->tstamp = *tstamp;
1376 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1377 return;
1378 memset(&r1, 0, sizeof(r1));
1379 r1.event = event;
1380 r1.tstamp_sec = tstamp->tv_sec;
1381 r1.tstamp_nsec = tstamp->tv_nsec;
1382 r1.val = resolution;
1383 spin_lock_irqsave(&tu->qlock, flags);
1384 snd_timer_user_append_to_tqueue(tu, &r1);
1385 spin_unlock_irqrestore(&tu->qlock, flags);
1386 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1387 wake_up(&tu->qchange_sleep);
1388 }
1389
1390 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1391 {
1392 struct snd_timer_user *tu = timeri->callback_data;
1393
1394 tu->disconnected = true;
1395 wake_up(&tu->qchange_sleep);
1396 }
1397
1398 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1399 unsigned long resolution,
1400 unsigned long ticks)
1401 {
1402 struct snd_timer_user *tu = timeri->callback_data;
1403 struct snd_timer_tread64 *r, r1;
1404 struct timespec64 tstamp;
1405 int prev, append = 0;
1406
1407 memset(&r1, 0, sizeof(r1));
1408 memset(&tstamp, 0, sizeof(tstamp));
1409 spin_lock(&tu->qlock);
1410 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1411 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1412 spin_unlock(&tu->qlock);
1413 return;
1414 }
1415 if (tu->last_resolution != resolution || ticks > 0) {
1416 if (timer_tstamp_monotonic)
1417 ktime_get_ts64(&tstamp);
1418 else
1419 ktime_get_real_ts64(&tstamp);
1420 }
1421 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1422 tu->last_resolution != resolution) {
1423 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1424 r1.tstamp_sec = tstamp.tv_sec;
1425 r1.tstamp_nsec = tstamp.tv_nsec;
1426 r1.val = resolution;
1427 snd_timer_user_append_to_tqueue(tu, &r1);
1428 tu->last_resolution = resolution;
1429 append++;
1430 }
1431 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1432 goto __wake;
1433 if (ticks == 0)
1434 goto __wake;
1435 if (tu->qused > 0) {
1436 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1437 r = &tu->tqueue[prev];
1438 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1439 r->tstamp_sec = tstamp.tv_sec;
1440 r->tstamp_nsec = tstamp.tv_nsec;
1441 r->val += ticks;
1442 append++;
1443 goto __wake;
1444 }
1445 }
1446 r1.event = SNDRV_TIMER_EVENT_TICK;
1447 r1.tstamp_sec = tstamp.tv_sec;
1448 r1.tstamp_nsec = tstamp.tv_nsec;
1449 r1.val = ticks;
1450 snd_timer_user_append_to_tqueue(tu, &r1);
1451 append++;
1452 __wake:
1453 spin_unlock(&tu->qlock);
1454 if (append == 0)
1455 return;
1456 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1457 wake_up(&tu->qchange_sleep);
1458 }
1459
1460 static int realloc_user_queue(struct snd_timer_user *tu, int size)
1461 {
1462 struct snd_timer_read *queue = NULL;
1463 struct snd_timer_tread64 *tqueue = NULL;
1464
1465 if (tu->tread) {
1466 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
1467 if (!tqueue)
1468 return -ENOMEM;
1469 } else {
1470 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
1471 if (!queue)
1472 return -ENOMEM;
1473 }
1474
1475 spin_lock_irq(&tu->qlock);
1476 kfree(tu->queue);
1477 kfree(tu->tqueue);
1478 tu->queue_size = size;
1479 tu->queue = queue;
1480 tu->tqueue = tqueue;
1481 tu->qhead = tu->qtail = tu->qused = 0;
1482 spin_unlock_irq(&tu->qlock);
1483
1484 return 0;
1485 }
1486
1487 static int snd_timer_user_open(struct inode *inode, struct file *file)
1488 {
1489 struct snd_timer_user *tu;
1490 int err;
1491
1492 err = stream_open(inode, file);
1493 if (err < 0)
1494 return err;
1495
1496 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1497 if (tu == NULL)
1498 return -ENOMEM;
1499 spin_lock_init(&tu->qlock);
1500 init_waitqueue_head(&tu->qchange_sleep);
1501 mutex_init(&tu->ioctl_lock);
1502 tu->ticks = 1;
1503 if (realloc_user_queue(tu, 128) < 0) {
1504 kfree(tu);
1505 return -ENOMEM;
1506 }
1507 file->private_data = tu;
1508 return 0;
1509 }
1510
1511 static int snd_timer_user_release(struct inode *inode, struct file *file)
1512 {
1513 struct snd_timer_user *tu;
1514
1515 if (file->private_data) {
1516 tu = file->private_data;
1517 file->private_data = NULL;
1518 mutex_lock(&tu->ioctl_lock);
1519 if (tu->timeri) {
1520 snd_timer_close(tu->timeri);
1521 snd_timer_instance_free(tu->timeri);
1522 }
1523 mutex_unlock(&tu->ioctl_lock);
1524 kfree(tu->queue);
1525 kfree(tu->tqueue);
1526 kfree(tu);
1527 }
1528 return 0;
1529 }
1530
1531 static void snd_timer_user_zero_id(struct snd_timer_id *id)
1532 {
1533 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1534 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1535 id->card = -1;
1536 id->device = -1;
1537 id->subdevice = -1;
1538 }
1539
1540 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1541 {
1542 id->dev_class = timer->tmr_class;
1543 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1544 id->card = timer->card ? timer->card->number : -1;
1545 id->device = timer->tmr_device;
1546 id->subdevice = timer->tmr_subdevice;
1547 }
1548
1549 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1550 {
1551 struct snd_timer_id id;
1552 struct snd_timer *timer;
1553 struct list_head *p;
1554
1555 if (copy_from_user(&id, _tid, sizeof(id)))
1556 return -EFAULT;
1557 mutex_lock(&register_mutex);
1558 if (id.dev_class < 0) { /* first item */
1559 if (list_empty(&snd_timer_list))
1560 snd_timer_user_zero_id(&id);
1561 else {
1562 timer = list_entry(snd_timer_list.next,
1563 struct snd_timer, device_list);
1564 snd_timer_user_copy_id(&id, timer);
1565 }
1566 } else {
1567 switch (id.dev_class) {
1568 case SNDRV_TIMER_CLASS_GLOBAL:
1569 id.device = id.device < 0 ? 0 : id.device + 1;
1570 list_for_each(p, &snd_timer_list) {
1571 timer = list_entry(p, struct snd_timer, device_list);
1572 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1573 snd_timer_user_copy_id(&id, timer);
1574 break;
1575 }
1576 if (timer->tmr_device >= id.device) {
1577 snd_timer_user_copy_id(&id, timer);
1578 break;
1579 }
1580 }
1581 if (p == &snd_timer_list)
1582 snd_timer_user_zero_id(&id);
1583 break;
1584 case SNDRV_TIMER_CLASS_CARD:
1585 case SNDRV_TIMER_CLASS_PCM:
1586 if (id.card < 0) {
1587 id.card = 0;
1588 } else {
1589 if (id.device < 0) {
1590 id.device = 0;
1591 } else {
1592 if (id.subdevice < 0)
1593 id.subdevice = 0;
1594 else if (id.subdevice < INT_MAX)
1595 id.subdevice++;
1596 }
1597 }
1598 list_for_each(p, &snd_timer_list) {
1599 timer = list_entry(p, struct snd_timer, device_list);
1600 if (timer->tmr_class > id.dev_class) {
1601 snd_timer_user_copy_id(&id, timer);
1602 break;
1603 }
1604 if (timer->tmr_class < id.dev_class)
1605 continue;
1606 if (timer->card->number > id.card) {
1607 snd_timer_user_copy_id(&id, timer);
1608 break;
1609 }
1610 if (timer->card->number < id.card)
1611 continue;
1612 if (timer->tmr_device > id.device) {
1613 snd_timer_user_copy_id(&id, timer);
1614 break;
1615 }
1616 if (timer->tmr_device < id.device)
1617 continue;
1618 if (timer->tmr_subdevice > id.subdevice) {
1619 snd_timer_user_copy_id(&id, timer);
1620 break;
1621 }
1622 if (timer->tmr_subdevice < id.subdevice)
1623 continue;
1624 snd_timer_user_copy_id(&id, timer);
1625 break;
1626 }
1627 if (p == &snd_timer_list)
1628 snd_timer_user_zero_id(&id);
1629 break;
1630 default:
1631 snd_timer_user_zero_id(&id);
1632 }
1633 }
1634 mutex_unlock(&register_mutex);
1635 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1636 return -EFAULT;
1637 return 0;
1638 }
1639
1640 static int snd_timer_user_ginfo(struct file *file,
1641 struct snd_timer_ginfo __user *_ginfo)
1642 {
1643 struct snd_timer_ginfo *ginfo;
1644 struct snd_timer_id tid;
1645 struct snd_timer *t;
1646 struct list_head *p;
1647 int err = 0;
1648
1649 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1650 if (IS_ERR(ginfo))
1651 return PTR_ERR(ginfo);
1652
1653 tid = ginfo->tid;
1654 memset(ginfo, 0, sizeof(*ginfo));
1655 ginfo->tid = tid;
1656 mutex_lock(&register_mutex);
1657 t = snd_timer_find(&tid);
1658 if (t != NULL) {
1659 ginfo->card = t->card ? t->card->number : -1;
1660 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1661 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1662 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1663 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1664 ginfo->resolution = t->hw.resolution;
1665 if (t->hw.resolution_min > 0) {
1666 ginfo->resolution_min = t->hw.resolution_min;
1667 ginfo->resolution_max = t->hw.resolution_max;
1668 }
1669 list_for_each(p, &t->open_list_head) {
1670 ginfo->clients++;
1671 }
1672 } else {
1673 err = -ENODEV;
1674 }
1675 mutex_unlock(&register_mutex);
1676 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1677 err = -EFAULT;
1678 kfree(ginfo);
1679 return err;
1680 }
1681
1682 static int timer_set_gparams(struct snd_timer_gparams *gparams)
1683 {
1684 struct snd_timer *t;
1685 int err;
1686
1687 mutex_lock(&register_mutex);
1688 t = snd_timer_find(&gparams->tid);
1689 if (!t) {
1690 err = -ENODEV;
1691 goto _error;
1692 }
1693 if (!list_empty(&t->open_list_head)) {
1694 err = -EBUSY;
1695 goto _error;
1696 }
1697 if (!t->hw.set_period) {
1698 err = -ENOSYS;
1699 goto _error;
1700 }
1701 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
1702 _error:
1703 mutex_unlock(&register_mutex);
1704 return err;
1705 }
1706
1707 static int snd_timer_user_gparams(struct file *file,
1708 struct snd_timer_gparams __user *_gparams)
1709 {
1710 struct snd_timer_gparams gparams;
1711
1712 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1713 return -EFAULT;
1714 return timer_set_gparams(&gparams);
1715 }
1716
1717 static int snd_timer_user_gstatus(struct file *file,
1718 struct snd_timer_gstatus __user *_gstatus)
1719 {
1720 struct snd_timer_gstatus gstatus;
1721 struct snd_timer_id tid;
1722 struct snd_timer *t;
1723 int err = 0;
1724
1725 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1726 return -EFAULT;
1727 tid = gstatus.tid;
1728 memset(&gstatus, 0, sizeof(gstatus));
1729 gstatus.tid = tid;
1730 mutex_lock(&register_mutex);
1731 t = snd_timer_find(&tid);
1732 if (t != NULL) {
1733 spin_lock_irq(&t->lock);
1734 gstatus.resolution = snd_timer_hw_resolution(t);
1735 if (t->hw.precise_resolution) {
1736 t->hw.precise_resolution(t, &gstatus.resolution_num,
1737 &gstatus.resolution_den);
1738 } else {
1739 gstatus.resolution_num = gstatus.resolution;
1740 gstatus.resolution_den = 1000000000uL;
1741 }
1742 spin_unlock_irq(&t->lock);
1743 } else {
1744 err = -ENODEV;
1745 }
1746 mutex_unlock(&register_mutex);
1747 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1748 err = -EFAULT;
1749 return err;
1750 }
1751
1752 static int snd_timer_user_tselect(struct file *file,
1753 struct snd_timer_select __user *_tselect)
1754 {
1755 struct snd_timer_user *tu;
1756 struct snd_timer_select tselect;
1757 char str[32];
1758 int err = 0;
1759
1760 tu = file->private_data;
1761 if (tu->timeri) {
1762 snd_timer_close(tu->timeri);
1763 snd_timer_instance_free(tu->timeri);
1764 tu->timeri = NULL;
1765 }
1766 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1767 err = -EFAULT;
1768 goto __err;
1769 }
1770 sprintf(str, "application %i", current->pid);
1771 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1772 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
1773 tu->timeri = snd_timer_instance_new(str);
1774 if (!tu->timeri) {
1775 err = -ENOMEM;
1776 goto __err;
1777 }
1778
1779 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1780 tu->timeri->callback = tu->tread
1781 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
1782 tu->timeri->ccallback = snd_timer_user_ccallback;
1783 tu->timeri->callback_data = (void *)tu;
1784 tu->timeri->disconnect = snd_timer_user_disconnect;
1785
1786 err = snd_timer_open(tu->timeri, &tselect.id, current->pid);
1787 if (err < 0) {
1788 snd_timer_instance_free(tu->timeri);
1789 tu->timeri = NULL;
1790 }
1791
1792 __err:
1793 return err;
1794 }
1795
1796 static int snd_timer_user_info(struct file *file,
1797 struct snd_timer_info __user *_info)
1798 {
1799 struct snd_timer_user *tu;
1800 struct snd_timer_info *info;
1801 struct snd_timer *t;
1802 int err = 0;
1803
1804 tu = file->private_data;
1805 if (!tu->timeri)
1806 return -EBADFD;
1807 t = tu->timeri->timer;
1808 if (!t)
1809 return -EBADFD;
1810
1811 info = kzalloc(sizeof(*info), GFP_KERNEL);
1812 if (! info)
1813 return -ENOMEM;
1814 info->card = t->card ? t->card->number : -1;
1815 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1816 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1817 strlcpy(info->id, t->id, sizeof(info->id));
1818 strlcpy(info->name, t->name, sizeof(info->name));
1819 info->resolution = t->hw.resolution;
1820 if (copy_to_user(_info, info, sizeof(*_info)))
1821 err = -EFAULT;
1822 kfree(info);
1823 return err;
1824 }
1825
1826 static int snd_timer_user_params(struct file *file,
1827 struct snd_timer_params __user *_params)
1828 {
1829 struct snd_timer_user *tu;
1830 struct snd_timer_params params;
1831 struct snd_timer *t;
1832 int err;
1833
1834 tu = file->private_data;
1835 if (!tu->timeri)
1836 return -EBADFD;
1837 t = tu->timeri->timer;
1838 if (!t)
1839 return -EBADFD;
1840 if (copy_from_user(&params, _params, sizeof(params)))
1841 return -EFAULT;
1842 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1843 u64 resolution;
1844
1845 if (params.ticks < 1) {
1846 err = -EINVAL;
1847 goto _end;
1848 }
1849
1850 /* Don't allow resolution less than 1ms */
1851 resolution = snd_timer_resolution(tu->timeri);
1852 resolution *= params.ticks;
1853 if (resolution < 1000000) {
1854 err = -EINVAL;
1855 goto _end;
1856 }
1857 }
1858 if (params.queue_size > 0 &&
1859 (params.queue_size < 32 || params.queue_size > 1024)) {
1860 err = -EINVAL;
1861 goto _end;
1862 }
1863 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1864 (1<<SNDRV_TIMER_EVENT_TICK)|
1865 (1<<SNDRV_TIMER_EVENT_START)|
1866 (1<<SNDRV_TIMER_EVENT_STOP)|
1867 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1868 (1<<SNDRV_TIMER_EVENT_PAUSE)|
1869 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1870 (1<<SNDRV_TIMER_EVENT_RESUME)|
1871 (1<<SNDRV_TIMER_EVENT_MSTART)|
1872 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1873 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
1874 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1875 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
1876 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1877 err = -EINVAL;
1878 goto _end;
1879 }
1880 snd_timer_stop(tu->timeri);
1881 spin_lock_irq(&t->lock);
1882 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1883 SNDRV_TIMER_IFLG_EXCLUSIVE|
1884 SNDRV_TIMER_IFLG_EARLY_EVENT);
1885 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1886 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1887 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1888 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1889 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1890 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1891 spin_unlock_irq(&t->lock);
1892 if (params.queue_size > 0 &&
1893 (unsigned int)tu->queue_size != params.queue_size) {
1894 err = realloc_user_queue(tu, params.queue_size);
1895 if (err < 0)
1896 goto _end;
1897 }
1898 spin_lock_irq(&tu->qlock);
1899 tu->qhead = tu->qtail = tu->qused = 0;
1900 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1901 if (tu->tread) {
1902 struct snd_timer_tread64 tread;
1903 memset(&tread, 0, sizeof(tread));
1904 tread.event = SNDRV_TIMER_EVENT_EARLY;
1905 tread.tstamp_sec = 0;
1906 tread.tstamp_nsec = 0;
1907 tread.val = 0;
1908 snd_timer_user_append_to_tqueue(tu, &tread);
1909 } else {
1910 struct snd_timer_read *r = &tu->queue[0];
1911 r->resolution = 0;
1912 r->ticks = 0;
1913 tu->qused++;
1914 tu->qtail++;
1915 }
1916 }
1917 tu->filter = params.filter;
1918 tu->ticks = params.ticks;
1919 spin_unlock_irq(&tu->qlock);
1920 err = 0;
1921 _end:
1922 if (copy_to_user(_params, &params, sizeof(params)))
1923 return -EFAULT;
1924 return err;
1925 }
1926
1927 static int snd_timer_user_status32(struct file *file,
1928 struct snd_timer_status32 __user *_status)
1929 {
1930 struct snd_timer_user *tu;
1931 struct snd_timer_status32 status;
1932
1933 tu = file->private_data;
1934 if (!tu->timeri)
1935 return -EBADFD;
1936 memset(&status, 0, sizeof(status));
1937 status.tstamp_sec = tu->tstamp.tv_sec;
1938 status.tstamp_nsec = tu->tstamp.tv_nsec;
1939 status.resolution = snd_timer_resolution(tu->timeri);
1940 status.lost = tu->timeri->lost;
1941 status.overrun = tu->overrun;
1942 spin_lock_irq(&tu->qlock);
1943 status.queue = tu->qused;
1944 spin_unlock_irq(&tu->qlock);
1945 if (copy_to_user(_status, &status, sizeof(status)))
1946 return -EFAULT;
1947 return 0;
1948 }
1949
1950 static int snd_timer_user_status64(struct file *file,
1951 struct snd_timer_status64 __user *_status)
1952 {
1953 struct snd_timer_user *tu;
1954 struct snd_timer_status64 status;
1955
1956 tu = file->private_data;
1957 if (!tu->timeri)
1958 return -EBADFD;
1959 memset(&status, 0, sizeof(status));
1960 status.tstamp_sec = tu->tstamp.tv_sec;
1961 status.tstamp_nsec = tu->tstamp.tv_nsec;
1962 status.resolution = snd_timer_resolution(tu->timeri);
1963 status.lost = tu->timeri->lost;
1964 status.overrun = tu->overrun;
1965 spin_lock_irq(&tu->qlock);
1966 status.queue = tu->qused;
1967 spin_unlock_irq(&tu->qlock);
1968 if (copy_to_user(_status, &status, sizeof(status)))
1969 return -EFAULT;
1970 return 0;
1971 }
1972
1973 static int snd_timer_user_start(struct file *file)
1974 {
1975 int err;
1976 struct snd_timer_user *tu;
1977
1978 tu = file->private_data;
1979 if (!tu->timeri)
1980 return -EBADFD;
1981 snd_timer_stop(tu->timeri);
1982 tu->timeri->lost = 0;
1983 tu->last_resolution = 0;
1984 err = snd_timer_start(tu->timeri, tu->ticks);
1985 if (err < 0)
1986 return err;
1987 return 0;
1988 }
1989
1990 static int snd_timer_user_stop(struct file *file)
1991 {
1992 int err;
1993 struct snd_timer_user *tu;
1994
1995 tu = file->private_data;
1996 if (!tu->timeri)
1997 return -EBADFD;
1998 err = snd_timer_stop(tu->timeri);
1999 if (err < 0)
2000 return err;
2001 return 0;
2002 }
2003
2004 static int snd_timer_user_continue(struct file *file)
2005 {
2006 int err;
2007 struct snd_timer_user *tu;
2008
2009 tu = file->private_data;
2010 if (!tu->timeri)
2011 return -EBADFD;
2012 /* start timer instead of continue if it's not used before */
2013 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
2014 return snd_timer_user_start(file);
2015 tu->timeri->lost = 0;
2016 err = snd_timer_continue(tu->timeri);
2017 if (err < 0)
2018 return err;
2019 return 0;
2020 }
2021
2022 static int snd_timer_user_pause(struct file *file)
2023 {
2024 int err;
2025 struct snd_timer_user *tu;
2026
2027 tu = file->private_data;
2028 if (!tu->timeri)
2029 return -EBADFD;
2030 err = snd_timer_pause(tu->timeri);
2031 if (err < 0)
2032 return err;
2033 return 0;
2034 }
2035
2036 static int snd_timer_user_tread(void __user *argp, struct snd_timer_user *tu,
2037 unsigned int cmd, bool compat)
2038 {
2039 int __user *p = argp;
2040 int xarg, old_tread;
2041
2042 if (tu->timeri) /* too late */
2043 return -EBUSY;
2044 if (get_user(xarg, p))
2045 return -EFAULT;
2046
2047 old_tread = tu->tread;
2048
2049 if (!xarg)
2050 tu->tread = TREAD_FORMAT_NONE;
2051 else if (cmd == SNDRV_TIMER_IOCTL_TREAD64 ||
2052 (IS_ENABLED(CONFIG_64BIT) && !compat))
2053 tu->tread = TREAD_FORMAT_TIME64;
2054 else
2055 tu->tread = TREAD_FORMAT_TIME32;
2056
2057 if (tu->tread != old_tread &&
2058 realloc_user_queue(tu, tu->queue_size) < 0) {
2059 tu->tread = old_tread;
2060 return -ENOMEM;
2061 }
2062
2063 return 0;
2064 }
2065
2066 enum {
2067 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
2068 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
2069 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
2070 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
2071 };
2072
2073 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
2074 unsigned long arg, bool compat)
2075 {
2076 struct snd_timer_user *tu;
2077 void __user *argp = (void __user *)arg;
2078 int __user *p = argp;
2079
2080 tu = file->private_data;
2081 switch (cmd) {
2082 case SNDRV_TIMER_IOCTL_PVERSION:
2083 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
2084 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
2085 return snd_timer_user_next_device(argp);
2086 case SNDRV_TIMER_IOCTL_TREAD_OLD:
2087 case SNDRV_TIMER_IOCTL_TREAD64:
2088 return snd_timer_user_tread(argp, tu, cmd, compat);
2089 case SNDRV_TIMER_IOCTL_GINFO:
2090 return snd_timer_user_ginfo(file, argp);
2091 case SNDRV_TIMER_IOCTL_GPARAMS:
2092 return snd_timer_user_gparams(file, argp);
2093 case SNDRV_TIMER_IOCTL_GSTATUS:
2094 return snd_timer_user_gstatus(file, argp);
2095 case SNDRV_TIMER_IOCTL_SELECT:
2096 return snd_timer_user_tselect(file, argp);
2097 case SNDRV_TIMER_IOCTL_INFO:
2098 return snd_timer_user_info(file, argp);
2099 case SNDRV_TIMER_IOCTL_PARAMS:
2100 return snd_timer_user_params(file, argp);
2101 case SNDRV_TIMER_IOCTL_STATUS32:
2102 return snd_timer_user_status32(file, argp);
2103 case SNDRV_TIMER_IOCTL_STATUS64:
2104 return snd_timer_user_status64(file, argp);
2105 case SNDRV_TIMER_IOCTL_START:
2106 case SNDRV_TIMER_IOCTL_START_OLD:
2107 return snd_timer_user_start(file);
2108 case SNDRV_TIMER_IOCTL_STOP:
2109 case SNDRV_TIMER_IOCTL_STOP_OLD:
2110 return snd_timer_user_stop(file);
2111 case SNDRV_TIMER_IOCTL_CONTINUE:
2112 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
2113 return snd_timer_user_continue(file);
2114 case SNDRV_TIMER_IOCTL_PAUSE:
2115 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
2116 return snd_timer_user_pause(file);
2117 }
2118 return -ENOTTY;
2119 }
2120
2121 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
2122 unsigned long arg)
2123 {
2124 struct snd_timer_user *tu = file->private_data;
2125 long ret;
2126
2127 mutex_lock(&tu->ioctl_lock);
2128 ret = __snd_timer_user_ioctl(file, cmd, arg, false);
2129 mutex_unlock(&tu->ioctl_lock);
2130 return ret;
2131 }
2132
2133 static int snd_timer_user_fasync(int fd, struct file * file, int on)
2134 {
2135 struct snd_timer_user *tu;
2136
2137 tu = file->private_data;
2138 return fasync_helper(fd, file, on, &tu->fasync);
2139 }
2140
2141 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
2142 size_t count, loff_t *offset)
2143 {
2144 struct snd_timer_tread64 *tread;
2145 struct snd_timer_tread32 tread32;
2146 struct snd_timer_user *tu;
2147 long result = 0, unit;
2148 int qhead;
2149 int err = 0;
2150
2151 tu = file->private_data;
2152 switch (tu->tread) {
2153 case TREAD_FORMAT_TIME64:
2154 unit = sizeof(struct snd_timer_tread64);
2155 break;
2156 case TREAD_FORMAT_TIME32:
2157 unit = sizeof(struct snd_timer_tread32);
2158 break;
2159 case TREAD_FORMAT_NONE:
2160 unit = sizeof(struct snd_timer_read);
2161 break;
2162 default:
2163 WARN_ONCE(1, "Corrupt snd_timer_user\n");
2164 return -ENOTSUPP;
2165 }
2166
2167 mutex_lock(&tu->ioctl_lock);
2168 spin_lock_irq(&tu->qlock);
2169 while ((long)count - result >= unit) {
2170 while (!tu->qused) {
2171 wait_queue_entry_t wait;
2172
2173 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
2174 err = -EAGAIN;
2175 goto _error;
2176 }
2177
2178 set_current_state(TASK_INTERRUPTIBLE);
2179 init_waitqueue_entry(&wait, current);
2180 add_wait_queue(&tu->qchange_sleep, &wait);
2181
2182 spin_unlock_irq(&tu->qlock);
2183 mutex_unlock(&tu->ioctl_lock);
2184 schedule();
2185 mutex_lock(&tu->ioctl_lock);
2186 spin_lock_irq(&tu->qlock);
2187
2188 remove_wait_queue(&tu->qchange_sleep, &wait);
2189
2190 if (tu->disconnected) {
2191 err = -ENODEV;
2192 goto _error;
2193 }
2194 if (signal_pending(current)) {
2195 err = -ERESTARTSYS;
2196 goto _error;
2197 }
2198 }
2199
2200 qhead = tu->qhead++;
2201 tu->qhead %= tu->queue_size;
2202 tu->qused--;
2203 spin_unlock_irq(&tu->qlock);
2204
2205 tread = &tu->tqueue[qhead];
2206
2207 switch (tu->tread) {
2208 case TREAD_FORMAT_TIME64:
2209 if (copy_to_user(buffer, tread,
2210 sizeof(struct snd_timer_tread64)))
2211 err = -EFAULT;
2212 break;
2213 case TREAD_FORMAT_TIME32:
2214 memset(&tread32, 0, sizeof(tread32));
2215 tread32 = (struct snd_timer_tread32) {
2216 .event = tread->event,
2217 .tstamp_sec = tread->tstamp_sec,
2218 .tstamp_nsec = tread->tstamp_nsec,
2219 .val = tread->val,
2220 };
2221
2222 if (copy_to_user(buffer, &tread32, sizeof(tread32)))
2223 err = -EFAULT;
2224 break;
2225 case TREAD_FORMAT_NONE:
2226 if (copy_to_user(buffer, &tu->queue[qhead],
2227 sizeof(struct snd_timer_read)))
2228 err = -EFAULT;
2229 break;
2230 default:
2231 err = -ENOTSUPP;
2232 break;
2233 }
2234
2235 spin_lock_irq(&tu->qlock);
2236 if (err < 0)
2237 goto _error;
2238 result += unit;
2239 buffer += unit;
2240 }
2241 _error:
2242 spin_unlock_irq(&tu->qlock);
2243 mutex_unlock(&tu->ioctl_lock);
2244 return result > 0 ? result : err;
2245 }
2246
2247 static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait)
2248 {
2249 __poll_t mask;
2250 struct snd_timer_user *tu;
2251
2252 tu = file->private_data;
2253
2254 poll_wait(file, &tu->qchange_sleep, wait);
2255
2256 mask = 0;
2257 spin_lock_irq(&tu->qlock);
2258 if (tu->qused)
2259 mask |= EPOLLIN | EPOLLRDNORM;
2260 if (tu->disconnected)
2261 mask |= EPOLLERR;
2262 spin_unlock_irq(&tu->qlock);
2263
2264 return mask;
2265 }
2266
2267 #ifdef CONFIG_COMPAT
2268 #include "timer_compat.c"
2269 #else
2270 #define snd_timer_user_ioctl_compat NULL
2271 #endif
2272
2273 static const struct file_operations snd_timer_f_ops =
2274 {
2275 .owner = THIS_MODULE,
2276 .read = snd_timer_user_read,
2277 .open = snd_timer_user_open,
2278 .release = snd_timer_user_release,
2279 .llseek = no_llseek,
2280 .poll = snd_timer_user_poll,
2281 .unlocked_ioctl = snd_timer_user_ioctl,
2282 .compat_ioctl = snd_timer_user_ioctl_compat,
2283 .fasync = snd_timer_user_fasync,
2284 };
2285
2286 /* unregister the system timer */
2287 static void snd_timer_free_all(void)
2288 {
2289 struct snd_timer *timer, *n;
2290
2291 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2292 snd_timer_free(timer);
2293 }
2294
2295 static struct device timer_dev;
2296
2297 /*
2298 * ENTRY functions
2299 */
2300
2301 static int __init alsa_timer_init(void)
2302 {
2303 int err;
2304
2305 snd_device_initialize(&timer_dev, NULL);
2306 dev_set_name(&timer_dev, "timer");
2307
2308 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2309 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2310 "system timer");
2311 #endif
2312
2313 err = snd_timer_register_system();
2314 if (err < 0) {
2315 pr_err("ALSA: unable to register system timer (%i)\n", err);
2316 goto put_timer;
2317 }
2318
2319 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2320 &snd_timer_f_ops, NULL, &timer_dev);
2321 if (err < 0) {
2322 pr_err("ALSA: unable to register timer device (%i)\n", err);
2323 snd_timer_free_all();
2324 goto put_timer;
2325 }
2326
2327 snd_timer_proc_init();
2328 return 0;
2329
2330 put_timer:
2331 put_device(&timer_dev);
2332 return err;
2333 }
2334
2335 static void __exit alsa_timer_exit(void)
2336 {
2337 snd_unregister_device(&timer_dev);
2338 snd_timer_free_all();
2339 put_device(&timer_dev);
2340 snd_timer_proc_done();
2341 #ifdef SNDRV_OSS_INFO_DEV_TIMERS
2342 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2343 #endif
2344 }
2345
2346 module_init(alsa_timer_init)
2347 module_exit(alsa_timer_exit)
Linux with added FPC-III support