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Merge branch 'for-linus' into for-next
[linux-2.6-block.git] / sound / core / timer.c
CommitLineData
1a59d1b8 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * Timers abstract layer
c1017a4c 4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4
LT		 5 */
6
1da177e4
LT		 7#include <linux/delay.h>
8#include <linux/init.h>
1da177e4
LT		 9#include <linux/slab.h>
10#include <linux/time.h>
1a60d4c5 11#include <linux/mutex.h>
51990e82 12#include <linux/device.h>
65a77217 13#include <linux/module.h>
543537bd 14#include <linux/string.h>
174cd4b1 15#include <linux/sched/signal.h>
1da177e4
LT		 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>
1da177e4 23
9f8a7658
TI		 24/* internal flags */
25#define SNDRV_TIMER_IFLG_PAUSED 0x00010000
fe1b26c9 26#define SNDRV_TIMER_IFLG_DEAD 0x00020000
9f8a7658 27
8eeaa2f9 28#if IS_ENABLED(CONFIG_SND_HRTIMER)
109fef9e 29#define DEFAULT_TIMER_LIMIT 4
1da177e4
LT		 30#else
31#define DEFAULT_TIMER_LIMIT 1
32#endif
33
34static int timer_limit = DEFAULT_TIMER_LIMIT;
b751eef1 35static int timer_tstamp_monotonic = 1;
c1017a4c 36MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
1da177e4
LT		 37MODULE_DESCRIPTION("ALSA timer interface");
38MODULE_LICENSE("GPL");
39module_param(timer_limit, int, 0444);
40MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
b751eef1
JK		 41module_param(timer_tstamp_monotonic, int, 0444);
42MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
1da177e4 43
03cfe6f5
KS		 44MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
45MODULE_ALIAS("devname:snd/timer");
46
07094ae6
BW		 47enum timer_tread_format {
48 TREAD_FORMAT_NONE = 0,
49 TREAD_FORMAT_TIME64,
50 TREAD_FORMAT_TIME32,
51};
52
53struct snd_timer_tread32 {
54 int event;
55 s32 tstamp_sec;
56 s32 tstamp_nsec;
57 unsigned int val;
58};
59
60struct 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
53d2f744
TI		 69struct snd_timer_user {
70 struct snd_timer_instance *timeri;
6b172a85 71 int tread; /* enhanced read with timestamps and events */
1da177e4
LT		 72 unsigned long ticks;
73 unsigned long overrun;
74 int qhead;
75 int qtail;
76 int qused;
77 int queue_size;
230323da 78 bool disconnected;
53d2f744 79 struct snd_timer_read *queue;
07094ae6 80 struct snd_timer_tread64 *tqueue;
1da177e4
LT		 81 spinlock_t qlock;
82 unsigned long last_resolution;
83 unsigned int filter;
fcae40c9 84 struct timespec64 tstamp; /* trigger tstamp */
1da177e4
LT		 85 wait_queue_head_t qchange_sleep;
86 struct fasync_struct *fasync;
af368027 87 struct mutex ioctl_lock;
53d2f744 88};
1da177e4 89
a07804cc
BW		 90struct 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
102struct 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
1da177e4
LT		 114/* list of timers */
115static LIST_HEAD(snd_timer_list);
116
117/* list of slave instances */
118static LIST_HEAD(snd_timer_slave_list);
119
120/* lock for slave active lists */
121static DEFINE_SPINLOCK(slave_active_lock);
122
fdea53fe
TI		 123#define MAX_SLAVE_INSTANCES 1000
124static int num_slaves;
125
1a60d4c5 126static DEFINE_MUTEX(register_mutex);
1da177e4 127
53d2f744
TI		 128static int snd_timer_free(struct snd_timer *timer);
129static int snd_timer_dev_free(struct snd_device *device);
130static int snd_timer_dev_register(struct snd_device *device);
c461482c 131static int snd_timer_dev_disconnect(struct snd_device *device);
1da177e4 132
53d2f744 133static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
1da177e4
LT		 134
135/*
136 * create a timer instance with the given owner string.
1da177e4 137 */
6a34367e 138struct snd_timer_instance *snd_timer_instance_new(const char *owner)
1da177e4 139{
53d2f744 140 struct snd_timer_instance *timeri;
6a34367e 141
ca2c0966 142 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
1da177e4
LT		 143 if (timeri == NULL)
144 return NULL;
543537bd 145 timeri->owner = kstrdup(owner, GFP_KERNEL);
1da177e4
LT		 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
6a34367e
TI		 156 return timeri;
157}
158EXPORT_SYMBOL(snd_timer_instance_new);
159
160void snd_timer_instance_free(struct snd_timer_instance *timeri)
161{
162 if (timeri) {
163 if (timeri->private_free)
164 timeri->private_free(timeri);
1da177e4
LT		 165 kfree(timeri->owner);
166 kfree(timeri);
1da177e4 167 }
1da177e4 168}
6a34367e 169EXPORT_SYMBOL(snd_timer_instance_free);
1da177e4
LT		 170
171/*
172 * find a timer instance from the given timer id
173 */
53d2f744 174static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
1da177e4 175{
63632563 176 struct snd_timer *timer;
1da177e4 177
9244b2c3 178 list_for_each_entry(timer, &snd_timer_list, device_list) {
1da177e4
LT		 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
ee2da997 195#ifdef CONFIG_MODULES
1da177e4 196
53d2f744 197static void snd_timer_request(struct snd_timer_id *tid)
1da177e4 198{
1da177e4
LT		 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
ebfc6de2
TI		 216/* move the slave if it belongs to the master; return 1 if match */
217static 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
1da177e4
LT		 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 */
9b7d869e 244static int snd_timer_check_slave(struct snd_timer_instance *slave)
1da177e4 245{
53d2f744
TI		 246 struct snd_timer *timer;
247 struct snd_timer_instance *master;
ebfc6de2 248 int err = 0;
1da177e4
LT		 249
250 /* FIXME: it's really dumb to look up all entries.. */
9244b2c3
JB		 251 list_for_each_entry(timer, &snd_timer_list, device_list) {
252 list_for_each_entry(master, &timer->open_list_head, open_list) {
ebfc6de2
TI		 253 err = check_matching_master_slave(master, slave);
254 if (err != 0) /* match found or error */
255 goto out;
1da177e4
LT		 256 }
257 }
ebfc6de2
TI		 258 out:
259 return err < 0 ? err : 0;
1da177e4
LT		 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 */
9b7d869e 268static int snd_timer_check_master(struct snd_timer_instance *master)
1da177e4 269{
9244b2c3 270 struct snd_timer_instance *slave, *tmp;
ebfc6de2 271 int err = 0;
1da177e4
LT		 272
273 /* check all pending slaves */
9244b2c3 274 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
ebfc6de2
TI		 275 err = check_matching_master_slave(master, slave);
276 if (err < 0)
277 break;
1da177e4 278 }
ebfc6de2 279 return err < 0 ? err : 0;
1da177e4
LT		 280}
281
33bbb8a0
TI		 282static void snd_timer_close_locked(struct snd_timer_instance *timeri,
283 struct device **card_devp_to_put);
9b7d869e 284
1da177e4
LT		 285/*
286 * open a timer instance
287 * when opening a master, the slave id must be here given.
288 */
6a34367e
TI		 289int snd_timer_open(struct snd_timer_instance *timeri,
290 struct snd_timer_id *tid,
1da177e4
LT		 291 unsigned int slave_id)
292{
53d2f744 293 struct snd_timer *timer;
a3933186 294 struct device *card_dev_to_put = NULL;
9b7d869e 295 int err;
6b172a85 296
41672c0c 297 mutex_lock(&register_mutex);
1da177e4
LT		 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) {
cf74dcf3
TI		 302 pr_debug("ALSA: timer: invalid slave class %i\n",
303 tid->dev_sclass);
41672c0c
TI		 304 err = -EINVAL;
305 goto unlock;
1da177e4 306 }
fdea53fe
TI		 307 if (num_slaves >= MAX_SLAVE_INSTANCES) {
308 err = -EBUSY;
309 goto unlock;
310 }
1da177e4
LT		 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);
fdea53fe 315 num_slaves++;
9b7d869e 316 err = snd_timer_check_slave(timeri);
0c4f09ce 317 goto list_added;
1da177e4
LT		 318 }
319
320 /* open a master instance */
1da177e4 321 timer = snd_timer_find(tid);
ee2da997
JB		 322#ifdef CONFIG_MODULES
323 if (!timer) {
1a60d4c5 324 mutex_unlock(&register_mutex);
1da177e4 325 snd_timer_request(tid);
1a60d4c5 326 mutex_lock(&register_mutex);
1da177e4
LT		 327 timer = snd_timer_find(tid);
328 }
329#endif
2fd43d11 330 if (!timer) {
41672c0c
TI		 331 err = -ENODEV;
332 goto unlock;
1da177e4 333 }
2fd43d11 334 if (!list_empty(&timer->open_list_head)) {
e7af6307
TI		 335 struct snd_timer_instance *t =
336 list_entry(timer->open_list_head.next,
53d2f744 337 struct snd_timer_instance, open_list);
e7af6307 338 if (t->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
41672c0c 339 err = -EBUSY;
41672c0c 340 goto unlock;
2fd43d11
CL		 341 }
342 }
9b7d869e 343 if (timer->num_instances >= timer->max_instances) {
41672c0c
TI		 344 err = -EBUSY;
345 goto unlock;
9b7d869e 346 }
6a34367e
TI		 347 if (!try_module_get(timer->module)) {
348 err = -EBUSY;
41672c0c 349 goto unlock;
2fd43d11 350 }
230323da 351 /* take a card refcount for safe disconnection */
6a34367e 352 if (timer->card) {
230323da 353 get_device(&timer->card->card_dev);
6a34367e
TI		 354 card_dev_to_put = &timer->card->card_dev;
355 }
8ddc0563
VN		 356
357 if (list_empty(&timer->open_list_head) && timer->hw.open) {
41672c0c 358 err = timer->hw.open(timer);
8ddc0563 359 if (err) {
8ddc0563 360 module_put(timer->module);
41672c0c 361 goto unlock;
8ddc0563
VN		 362 }
363 }
364
6a34367e
TI		 365 timeri->timer = timer;
366 timeri->slave_class = tid->dev_sclass;
367 timeri->slave_id = slave_id;
368
2fd43d11 369 list_add_tail(&timeri->open_list, &timer->open_list_head);
9b7d869e
TI		 370 timer->num_instances++;
371 err = snd_timer_check_master(timeri);
0c4f09ce 372list_added:
6a34367e 373 if (err < 0)
a3933186 374 snd_timer_close_locked(timeri, &card_dev_to_put);
41672c0c
TI		 375
376 unlock:
1a60d4c5 377 mutex_unlock(&register_mutex);
a3933186 378 /* put_device() is called after unlock for avoiding deadlock */
6a34367e 379 if (err < 0 && card_dev_to_put)
a3933186 380 put_device(card_dev_to_put);
9b7d869e 381 return err;
1da177e4 382}
98856392 383EXPORT_SYMBOL(snd_timer_open);
1da177e4 384
1da177e4
LT		 385/*
386 * close a timer instance
9b7d869e 387 * call this with register_mutex down.
1da177e4 388 */
33bbb8a0
TI		 389static void snd_timer_close_locked(struct snd_timer_instance *timeri,
390 struct device **card_devp_to_put)
1da177e4 391{
fe1b26c9 392 struct snd_timer *timer = timeri->timer;
9244b2c3 393 struct snd_timer_instance *slave, *tmp;
1da177e4 394
fe1b26c9
TI		 395 if (timer) {
396 spin_lock_irq(&timer->lock);
397 timeri->flags |= SNDRV_TIMER_IFLG_DEAD;
398 spin_unlock_irq(&timer->lock);
399 }
400
6a34367e
TI		 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 }
9984d1b5 406
1da177e4
LT		 407 /* force to stop the timer */
408 snd_timer_stop(timeri);
409
9984d1b5 410 if (timer) {
9b7d869e 411 timer->num_instances--;
1da177e4
LT		 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);
9984d1b5 420
1da177e4 421 /* remove slave links */
b5a663aa
TI		 422 spin_lock_irq(&slave_active_lock);
423 spin_lock(&timer->lock);
6a34367e 424 timeri->timer = NULL;
9244b2c3
JB		 425 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
426 open_list) {
9244b2c3 427 list_move_tail(&slave->open_list, &snd_timer_slave_list);
9b7d869e 428 timer->num_instances--;
1da177e4
LT		 429 slave->master = NULL;
430 slave->timer = NULL;
b5a663aa
TI		 431 list_del_init(&slave->ack_list);
432 list_del_init(&slave->active_list);
1da177e4 433 }
b5a663aa
TI		 434 spin_unlock(&timer->lock);
435 spin_unlock_irq(&slave_active_lock);
9984d1b5
TI		 436
437 /* slave doesn't need to release timer resources below */
438 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
439 timer = NULL;
1da177e4 440 }
9984d1b5 441
9984d1b5
TI		 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)
a3933186 447 *card_devp_to_put = &timer->card->card_dev;
de24214d 448 module_put(timer->module);
9984d1b5 449 }
1da177e4 450}
9b7d869e
TI		 451
452/*
453 * close a timer instance
454 */
33bbb8a0 455void snd_timer_close(struct snd_timer_instance *timeri)
9b7d869e 456{
a3933186 457 struct device *card_dev_to_put = NULL;
9b7d869e
TI		 458
459 if (snd_BUG_ON(!timeri))
33bbb8a0 460 return;
9b7d869e
TI		 461
462 mutex_lock(&register_mutex);
33bbb8a0 463 snd_timer_close_locked(timeri, &card_dev_to_put);
9b7d869e 464 mutex_unlock(&register_mutex);
a3933186
TI		 465 /* put_device() is called after unlock for avoiding deadlock */
466 if (card_dev_to_put)
467 put_device(card_dev_to_put);
9b7d869e 468}
98856392 469EXPORT_SYMBOL(snd_timer_close);
1da177e4 470
fdcb5761
TI		 471static 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
53d2f744 479unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
1da177e4 480{
53d2f744 481 struct snd_timer * timer;
9d4d207d
TI		 482 unsigned long ret = 0;
483 unsigned long flags;
1da177e4
LT		 484
485 if (timeri == NULL)
486 return 0;
dd1f7ab8 487 timer = timeri->timer;
9d4d207d
TI		 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;
1da177e4 494}
98856392 495EXPORT_SYMBOL(snd_timer_resolution);
1da177e4 496
53d2f744 497static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
1da177e4 498{
9d4d207d 499 struct snd_timer *timer = ti->timer;
1da177e4 500 unsigned long resolution = 0;
53d2f744 501 struct snd_timer_instance *ts;
fcae40c9 502 struct timespec64 tstamp;
1da177e4 503
b751eef1 504 if (timer_tstamp_monotonic)
fcae40c9 505 ktime_get_ts64(&tstamp);
b751eef1 506 else
fcae40c9 507 ktime_get_real_ts64(&tstamp);
7eaa943c
TI		 508 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
509 event > SNDRV_TIMER_EVENT_PAUSE))
510 return;
9d4d207d
TI		 511 if (timer &&
512 (event == SNDRV_TIMER_EVENT_START ||
513 event == SNDRV_TIMER_EVENT_CONTINUE))
514 resolution = snd_timer_hw_resolution(timer);
1da177e4 515 if (ti->ccallback)
b30477d5 516 ti->ccallback(ti, event, &tstamp, resolution);
1da177e4
LT		 517 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
518 return;
1da177e4
LT		 519 if (timer == NULL)
520 return;
521 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
522 return;
9244b2c3 523 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1da177e4 524 if (ts->ccallback)
117159f0 525 ts->ccallback(ts, event + 100, &tstamp, resolution);
1da177e4
LT		 526}
527
f65e0d29
TI		 528/* start/continue a master timer */
529static int snd_timer_start1(struct snd_timer_instance *timeri,
530 bool start, unsigned long ticks)
1da177e4 531{
f65e0d29
TI		 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);
fe1b26c9
TI		 541 if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
542 result = -EINVAL;
543 goto unlock;
544 }
f65e0d29
TI		 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
5b7c757d 561 list_move_tail(&timeri->active_list, &timer->active_list_head);
1da177e4
LT		 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;
f65e0d29 567 result = 1; /* delayed start */
1da177e4 568 } else {
f65e0d29
TI		 569 if (start)
570 timer->sticks = ticks;
1da177e4
LT		 571 timer->hw.start(timer);
572 __start_now:
573 timer->running++;
574 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
f65e0d29 575 result = 0;
1da177e4 576 }
f65e0d29
TI		 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;
1da177e4
LT		 582}
583
f65e0d29
TI		 584/* start/continue a slave timer */
585static int snd_timer_start_slave(struct snd_timer_instance *timeri,
586 bool start)
1da177e4
LT		 587{
588 unsigned long flags;
fe1b26c9 589 int err;
1da177e4
LT		 590
591 spin_lock_irqsave(&slave_active_lock, flags);
fe1b26c9
TI		 592 if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
593 err = -EINVAL;
594 goto unlock;
595 }
f784beb7 596 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
fe1b26c9
TI		 597 err = -EBUSY;
598 goto unlock;
f784beb7 599 }
1da177e4 600 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
b5a663aa
TI		 601 if (timeri->master && timeri->timer) {
602 spin_lock(&timeri->timer->lock);
6b172a85
CL		 603 list_add_tail(&timeri->active_list,
604 &timeri->master->slave_active_head);
f65e0d29
TI		 605 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
606 SNDRV_TIMER_EVENT_CONTINUE);
b5a663aa
TI		 607 spin_unlock(&timeri->timer->lock);
608 }
fe1b26c9
TI		 609 err = 1; /* delayed start */
610 unlock:
1da177e4 611 spin_unlock_irqrestore(&slave_active_lock, flags);
fe1b26c9 612 return err;
1da177e4
LT		 613}
614
f65e0d29
TI		 615/* stop/pause a master timer */
616static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
1da177e4 617{
53d2f744 618 struct snd_timer *timer;
f65e0d29 619 int result = 0;
1da177e4
LT		 620 unsigned long flags;
621
1da177e4
LT		 622 timer = timeri->timer;
623 if (!timer)
624 return -EINVAL;
625 spin_lock_irqsave(&timer->lock, flags);
f784beb7
TI		 626 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
627 SNDRV_TIMER_IFLG_START))) {
f65e0d29
TI		 628 result = -EBUSY;
629 goto unlock;
f784beb7 630 }
1da177e4
LT		 631 list_del_init(&timeri->ack_list);
632 list_del_init(&timeri->active_list);
f65e0d29
TI		 633 if (timer->card && timer->card->shutdown)
634 goto unlock;
635 if (stop) {
636 timeri->cticks = timeri->ticks;
637 timeri->pticks = 0;
230323da 638 }
1da177e4
LT		 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 }
c3b16813 651 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
9f8a7658
TI		 652 if (stop)
653 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
654 else
655 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
f65e0d29 656 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
3ae18097 657 SNDRV_TIMER_EVENT_PAUSE);
f65e0d29 658 unlock:
1da177e4 659 spin_unlock_irqrestore(&timer->lock, flags);
f65e0d29
TI		 660 return result;
661}
662
663/* stop/pause a slave timer */
664static 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 :
3ae18097 679 SNDRV_TIMER_EVENT_PAUSE);
f65e0d29
TI		 680 spin_unlock(&timeri->timer->lock);
681 }
682 spin_unlock_irqrestore(&slave_active_lock, flags);
1da177e4
LT		 683 return 0;
684}
685
f65e0d29
TI		 686/*
687 * start the timer instance
688 */
689int 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}
98856392 698EXPORT_SYMBOL(snd_timer_start);
f65e0d29 699
1da177e4
LT		 700/*
701 * stop the timer instance.
702 *
703 * do not call this from the timer callback!
704 */
53d2f744 705int snd_timer_stop(struct snd_timer_instance *timeri)
1da177e4 706{
f65e0d29
TI		 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);
1da177e4 711}
98856392 712EXPORT_SYMBOL(snd_timer_stop);
1da177e4
LT		 713
714/*
715 * start again.. the tick is kept.
716 */
53d2f744 717int snd_timer_continue(struct snd_timer_instance *timeri)
1da177e4 718{
9f8a7658
TI		 719 /* timer can continue only after pause */
720 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
721 return -EINVAL;
722
1da177e4 723 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
f65e0d29
TI		 724 return snd_timer_start_slave(timeri, false);
725 else
726 return snd_timer_start1(timeri, false, 0);
1da177e4 727}
98856392 728EXPORT_SYMBOL(snd_timer_continue);
1da177e4
LT		 729
730/*
731 * pause.. remember the ticks left
732 */
53d2f744 733int snd_timer_pause(struct snd_timer_instance * timeri)
1da177e4 734{
f65e0d29
TI		 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);
1da177e4 739}
98856392 740EXPORT_SYMBOL(snd_timer_pause);
1da177e4
LT		 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 */
53d2f744 748static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
1da177e4 749{
53d2f744 750 struct snd_timer_instance *ti;
1da177e4 751 unsigned long ticks = ~0UL;
1da177e4 752
9244b2c3 753 list_for_each_entry(ti, &timer->active_list_head, active_list) {
1da177e4
LT		 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
8748b850
TI		 775/* call callbacks in timer ack list */
776static void snd_timer_process_callbacks(struct snd_timer *timer,
777 struct list_head *head)
1da177e4 778{
53d2f744 779 struct snd_timer_instance *ti;
1da177e4 780 unsigned long resolution, ticks;
230323da 781
8748b850
TI		 782 while (!list_empty(head)) {
783 ti = list_first_entry(head, struct snd_timer_instance,
784 ack_list);
1da177e4 785
df55531b
TI		 786 /* remove from ack_list and make empty */
787 list_del_init(&ti->ack_list);
788
fe1b26c9
TI		 789 if (!(ti->flags & SNDRV_TIMER_IFLG_DEAD)) {
790 ticks = ti->pticks;
791 ti->pticks = 0;
792 resolution = ti->resolution;
df55531b 793 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
fe1b26c9
TI		 794 spin_unlock(&timer->lock);
795 if (ti->callback)
796 ti->callback(ti, resolution, ticks);
797 spin_lock(&timer->lock);
df55531b 798 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
fe1b26c9 799 }
1da177e4 800 }
8748b850
TI		 801}
802
7bb4a8a2
TI		 803/* clear pending instances from ack list */
804static 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
1da177e4
LT		 815/*
816 * timer tasklet
817 *
818 */
d1a58aae 819static void snd_timer_tasklet(struct tasklet_struct *t)
1da177e4 820{
d1a58aae 821 struct snd_timer *timer = from_tasklet(timer, t, task_queue);
2999ff5b 822 unsigned long flags;
1da177e4 823
7bb4a8a2
TI		 824 if (timer->card && timer->card->shutdown) {
825 snd_timer_clear_callbacks(timer, &timer->sack_list_head);
230323da 826 return;
7bb4a8a2 827 }
230323da 828
2999ff5b 829 spin_lock_irqsave(&timer->lock, flags);
8748b850 830 snd_timer_process_callbacks(timer, &timer->sack_list_head);
2999ff5b 831 spin_unlock_irqrestore(&timer->lock, flags);
1da177e4
LT		 832}
833
834/*
835 * timer interrupt
836 *
837 * ticks_left is usually equal to timer->sticks.
838 *
839 */
53d2f744 840void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
1da177e4 841{
9244b2c3 842 struct snd_timer_instance *ti, *ts, *tmp;
8748b850
TI		 843 unsigned long resolution;
844 struct list_head *ack_list_head;
b32425ac 845 unsigned long flags;
1da177e4
LT		 846 int use_tasklet = 0;
847
848 if (timer == NULL)
849 return;
850
7bb4a8a2
TI		 851 if (timer->card && timer->card->shutdown) {
852 snd_timer_clear_callbacks(timer, &timer->ack_list_head);
230323da 853 return;
7bb4a8a2 854 }
230323da 855
b32425ac 856 spin_lock_irqsave(&timer->lock, flags);
1da177e4
LT		 857
858 /* remember the current resolution */
fdcb5761 859 resolution = snd_timer_hw_resolution(timer);
1da177e4
LT		 860
861 /* loop for all active instances
9244b2c3 862 * Here we cannot use list_for_each_entry because the active_list of a
6b172a85
CL		 863 * processed instance is relinked to done_list_head before the callback
864 * is called.
1da177e4 865 */
9244b2c3
JB		 866 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
867 active_list) {
fe1b26c9
TI		 868 if (ti->flags & SNDRV_TIMER_IFLG_DEAD)
869 continue;
1da177e4
LT		 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;
094fd3be
TI		 884 --timer->running;
885 list_del_init(&ti->active_list);
1da177e4 886 }
6b172a85
CL		 887 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
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);
9244b2c3 894 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
1da177e4
LT		 895 ts->pticks = ti->pticks;
896 ts->resolution = resolution;
6b172a85
CL		 897 if (list_empty(&ts->ack_list))
898 list_add_tail(&ts->ack_list, ack_list_head);
1da177e4
LT		 899 }
900 }
901 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
cd93fe47 902 snd_timer_reschedule(timer, timer->sticks);
1da177e4
LT		 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 */
8748b850 919 snd_timer_process_callbacks(timer, &timer->ack_list_head);
1da177e4
LT		 920
921 /* do we have any slow callbacks? */
922 use_tasklet = !list_empty(&timer->sack_list_head);
b32425ac 923 spin_unlock_irqrestore(&timer->lock, flags);
1da177e4
LT		 924
925 if (use_tasklet)
1f04128a 926 tasklet_schedule(&timer->task_queue);
1da177e4 927}
98856392 928EXPORT_SYMBOL(snd_timer_interrupt);
1da177e4
LT		 929
930/*
931
932 */
933
53d2f744
TI		 934int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
935 struct snd_timer **rtimer)
1da177e4 936{
53d2f744 937 struct snd_timer *timer;
1da177e4 938 int err;
f15ee210 939 static const struct snd_device_ops ops = {
1da177e4
LT		 940 .dev_free = snd_timer_dev_free,
941 .dev_register = snd_timer_dev_register,
c461482c 942 .dev_disconnect = snd_timer_dev_disconnect,
1da177e4
LT		 943 };
944
7eaa943c
TI		 945 if (snd_BUG_ON(!tid))
946 return -EINVAL;
d10ee9c5
S		 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 }
7eaa943c
TI		 952 if (rtimer)
953 *rtimer = NULL;
ca2c0966 954 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
ec0e9937 955 if (!timer)
1da177e4
LT		 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));
6b760bb2 963 timer->sticks = 1;
1da177e4
LT		 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);
d1a58aae 970 tasklet_setup(&timer->task_queue, snd_timer_tasklet);
9b7d869e 971 timer->max_instances = 1000; /* default limit per timer */
1da177e4 972 if (card != NULL) {
de24214d 973 timer->module = card->module;
6b172a85
CL		 974 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
975 if (err < 0) {
1da177e4
LT		 976 snd_timer_free(timer);
977 return err;
978 }
979 }
7eaa943c
TI		 980 if (rtimer)
981 *rtimer = timer;
1da177e4
LT		 982 return 0;
983}
98856392 984EXPORT_SYMBOL(snd_timer_new);
1da177e4 985
53d2f744 986static int snd_timer_free(struct snd_timer *timer)
1da177e4 987{
7eaa943c
TI		 988 if (!timer)
989 return 0;
c461482c
TI		 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;
cf74dcf3 995 pr_warn("ALSA: timer %p is busy?\n", timer);
c461482c
TI		 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
1da177e4
LT		 1005 if (timer->private_free)
1006 timer->private_free(timer);
1007 kfree(timer);
1008 return 0;
1009}
1010
53d2f744 1011static int snd_timer_dev_free(struct snd_device *device)
1da177e4 1012{
53d2f744 1013 struct snd_timer *timer = device->device_data;
1da177e4
LT		 1014 return snd_timer_free(timer);
1015}
1016
53d2f744 1017static int snd_timer_dev_register(struct snd_device *dev)
1da177e4 1018{
53d2f744
TI		 1019 struct snd_timer *timer = dev->device_data;
1020 struct snd_timer *timer1;
1da177e4 1021
7eaa943c
TI		 1022 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
1023 return -ENXIO;
1da177e4
LT		 1024 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
1025 !timer->hw.resolution && timer->hw.c_resolution == NULL)
1026 return -EINVAL;
1027
1a60d4c5 1028 mutex_lock(&register_mutex);
9244b2c3 1029 list_for_each_entry(timer1, &snd_timer_list, device_list) {
1da177e4
LT		 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.. */
1a60d4c5 1049 mutex_unlock(&register_mutex);
1da177e4
LT		 1050 return -EBUSY;
1051 }
9244b2c3 1052 list_add_tail(&timer->device_list, &timer1->device_list);
1a60d4c5 1053 mutex_unlock(&register_mutex);
1da177e4
LT		 1054 return 0;
1055}
1056
c461482c 1057static int snd_timer_dev_disconnect(struct snd_device *device)
1da177e4 1058{
c461482c 1059 struct snd_timer *timer = device->device_data;
230323da
TI		 1060 struct snd_timer_instance *ti;
1061
1a60d4c5 1062 mutex_lock(&register_mutex);
c461482c 1063 list_del_init(&timer->device_list);
230323da
TI		 1064 /* wake up pending sleepers */
1065 list_for_each_entry(ti, &timer->open_list_head, open_list) {
40ed9444
TI		 1066 if (ti->disconnect)
1067 ti->disconnect(ti);
230323da 1068 }
1a60d4c5 1069 mutex_unlock(&register_mutex);
c461482c 1070 return 0;
1da177e4
LT		 1071}
1072
fcae40c9 1073void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tstamp)
1da177e4
LT		 1074{
1075 unsigned long flags;
1076 unsigned long resolution = 0;
53d2f744 1077 struct snd_timer_instance *ti, *ts;
1da177e4 1078
230323da
TI		 1079 if (timer->card && timer->card->shutdown)
1080 return;
7c22f1aa
TI		 1081 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
1082 return;
7eaa943c
TI		 1083 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
1084 event > SNDRV_TIMER_EVENT_MRESUME))
1085 return;
1da177e4 1086 spin_lock_irqsave(&timer->lock, flags);
a501dfa3
JK		 1087 if (event == SNDRV_TIMER_EVENT_MSTART ||
1088 event == SNDRV_TIMER_EVENT_MCONTINUE ||
fdcb5761
TI		 1089 event == SNDRV_TIMER_EVENT_MRESUME)
1090 resolution = snd_timer_hw_resolution(timer);
9244b2c3 1091 list_for_each_entry(ti, &timer->active_list_head, active_list) {
1da177e4
LT		 1092 if (ti->ccallback)
1093 ti->ccallback(ti, event, tstamp, resolution);
9244b2c3 1094 list_for_each_entry(ts, &ti->slave_active_head, active_list)
1da177e4
LT		 1095 if (ts->ccallback)
1096 ts->ccallback(ts, event, tstamp, resolution);
1da177e4
LT		 1097 }
1098 spin_unlock_irqrestore(&timer->lock, flags);
1099}
98856392 1100EXPORT_SYMBOL(snd_timer_notify);
1da177e4
LT		 1101
1102/*
1103 * exported functions for global timers
1104 */
53d2f744 1105int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
1da177e4 1106{
53d2f744 1107 struct snd_timer_id tid;
6b172a85 1108
1da177e4
LT		 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}
98856392 1116EXPORT_SYMBOL(snd_timer_global_new);
1da177e4 1117
53d2f744 1118int snd_timer_global_free(struct snd_timer *timer)
1da177e4
LT		 1119{
1120 return snd_timer_free(timer);
1121}
98856392 1122EXPORT_SYMBOL(snd_timer_global_free);
1da177e4 1123
53d2f744 1124int snd_timer_global_register(struct snd_timer *timer)
1da177e4 1125{
53d2f744 1126 struct snd_device dev;
1da177e4
LT		 1127
1128 memset(&dev, 0, sizeof(dev));
1129 dev.device_data = timer;
1130 return snd_timer_dev_register(&dev);
1131}
98856392 1132EXPORT_SYMBOL(snd_timer_global_register);
1da177e4 1133
6b172a85 1134/*
1da177e4
LT		 1135 * System timer
1136 */
1137
1138struct snd_timer_system_private {
1139 struct timer_list tlist;
38e9a80f 1140 struct snd_timer *snd_timer;
1da177e4
LT		 1141 unsigned long last_expires;
1142 unsigned long last_jiffies;
1143 unsigned long correction;
1144};
1145
38e9a80f 1146static void snd_timer_s_function(struct timer_list *t)
1da177e4 1147{
38e9a80f
KC		 1148 struct snd_timer_system_private *priv = from_timer(priv, t,
1149 tlist);
1150 struct snd_timer *timer = priv->snd_timer;
1da177e4
LT		 1151 unsigned long jiff = jiffies;
1152 if (time_after(jiff, priv->last_expires))
6ed5eff0 1153 priv->correction += (long)jiff - (long)priv->last_expires;
1da177e4
LT		 1154 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1155}
1156
53d2f744 1157static int snd_timer_s_start(struct snd_timer * timer)
1da177e4
LT		 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;
17f48ec3 1169 priv->correction = 0;
1da177e4 1170 }
4a07083e
TI		 1171 priv->last_expires = njiff;
1172 mod_timer(&priv->tlist, njiff);
1da177e4
LT		 1173 return 0;
1174}
1175
53d2f744 1176static int snd_timer_s_stop(struct snd_timer * timer)
1da177e4
LT		 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;
de2696d8 1188 priv->correction = 0;
1da177e4
LT		 1189 return 0;
1190}
1191
f146357f
TI		 1192static 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
df76996a 1201static const struct snd_timer_hardware snd_timer_system =
1da177e4
LT		 1202{
1203 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1204 .resolution = 1000000000L / HZ,
1205 .ticks = 10000000L,
f146357f 1206 .close = snd_timer_s_close,
1da177e4
LT		 1207 .start = snd_timer_s_start,
1208 .stop = snd_timer_s_stop
1209};
1210
53d2f744 1211static void snd_timer_free_system(struct snd_timer *timer)
1da177e4
LT		 1212{
1213 kfree(timer->private_data);
1214}
1215
1216static int snd_timer_register_system(void)
1217{
53d2f744 1218 struct snd_timer *timer;
1da177e4
LT		 1219 struct snd_timer_system_private *priv;
1220 int err;
1221
6b172a85
CL		 1222 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1223 if (err < 0)
1da177e4
LT		 1224 return err;
1225 strcpy(timer->name, "system timer");
1226 timer->hw = snd_timer_system;
ca2c0966 1227 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1da177e4
LT		 1228 if (priv == NULL) {
1229 snd_timer_free(timer);
1230 return -ENOMEM;
1231 }
38e9a80f
KC		 1232 priv->snd_timer = timer;
1233 timer_setup(&priv->tlist, snd_timer_s_function, 0);
1da177e4
LT		 1234 timer->private_data = priv;
1235 timer->private_free = snd_timer_free_system;
1236 return snd_timer_global_register(timer);
1237}
1238
cd6a6503 1239#ifdef CONFIG_SND_PROC_FS
1da177e4
LT		 1240/*
1241 * Info interface
1242 */
1243
53d2f744
TI		 1244static void snd_timer_proc_read(struct snd_info_entry *entry,
1245 struct snd_info_buffer *buffer)
1da177e4 1246{
53d2f744
TI		 1247 struct snd_timer *timer;
1248 struct snd_timer_instance *ti;
1da177e4 1249
1a60d4c5 1250 mutex_lock(&register_mutex);
9244b2c3 1251 list_for_each_entry(timer, &snd_timer_list, device_list) {
230323da
TI		 1252 if (timer->card && timer->card->shutdown)
1253 continue;
1da177e4
LT		 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:
6b172a85
CL		 1259 snd_iprintf(buffer, "C%i-%i: ",
1260 timer->card->number, timer->tmr_device);
1da177e4
LT		 1261 break;
1262 case SNDRV_TIMER_CLASS_PCM:
6b172a85
CL		 1263 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1264 timer->tmr_device, timer->tmr_subdevice);
1da177e4
LT		 1265 break;
1266 default:
6b172a85
CL		 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);
1da177e4
LT		 1270 }
1271 snd_iprintf(buffer, "%s :", timer->name);
1272 if (timer->hw.resolution)
6b172a85
CL		 1273 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1274 timer->hw.resolution / 1000,
1275 timer->hw.resolution % 1000,
1276 timer->hw.ticks);
1da177e4
LT		 1277 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1278 snd_iprintf(buffer, " SLAVE");
1279 snd_iprintf(buffer, "\n");
9244b2c3 1280 list_for_each_entry(ti, &timer->open_list_head, open_list)
6b172a85
CL		 1281 snd_iprintf(buffer, " Client %s : %s\n",
1282 ti->owner ? ti->owner : "unknown",
3bcf8eeb
PLB		 1283 (ti->flags & (SNDRV_TIMER_IFLG_START |
1284 SNDRV_TIMER_IFLG_RUNNING))
6b172a85 1285 ? "running" : "stopped");
1da177e4 1286 }
1a60d4c5 1287 mutex_unlock(&register_mutex);
1da177e4
LT		 1288}
1289
6581f4e7 1290static struct snd_info_entry *snd_timer_proc_entry;
e28563cc
TI		 1291
1292static 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) {
e28563cc
TI		 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
1307static void __exit snd_timer_proc_done(void)
1308{
746d4a02 1309 snd_info_free_entry(snd_timer_proc_entry);
e28563cc 1310}
cd6a6503 1311#else /* !CONFIG_SND_PROC_FS */
e28563cc
TI		 1312#define snd_timer_proc_init()
1313#define snd_timer_proc_done()
1314#endif
1315
1da177e4
LT		 1316/*
1317 * USER SPACE interface
1318 */
1319
53d2f744 1320static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
1da177e4
LT		 1321 unsigned long resolution,
1322 unsigned long ticks)
1323{
53d2f744
TI		 1324 struct snd_timer_user *tu = timeri->callback_data;
1325 struct snd_timer_read *r;
1da177e4 1326 int prev;
6b172a85 1327
1da177e4
LT		 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
53d2f744 1352static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
07094ae6 1353 struct snd_timer_tread64 *tread)
1da177e4
LT		 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
53d2f744
TI		 1364static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1365 int event,
fcae40c9 1366 struct timespec64 *tstamp,
1da177e4
LT		 1367 unsigned long resolution)
1368{
53d2f744 1369 struct snd_timer_user *tu = timeri->callback_data;
07094ae6 1370 struct snd_timer_tread64 r1;
bfe70783 1371 unsigned long flags;
1da177e4 1372
6b172a85
CL		 1373 if (event >= SNDRV_TIMER_EVENT_START &&
1374 event <= SNDRV_TIMER_EVENT_PAUSE)
1da177e4
LT		 1375 tu->tstamp = *tstamp;
1376 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1377 return;
9a47e9cf 1378 memset(&r1, 0, sizeof(r1));
1da177e4 1379 r1.event = event;
07094ae6
BW		 1380 r1.tstamp_sec = tstamp->tv_sec;
1381 r1.tstamp_nsec = tstamp->tv_nsec;
1da177e4 1382 r1.val = resolution;
bfe70783 1383 spin_lock_irqsave(&tu->qlock, flags);
1da177e4 1384 snd_timer_user_append_to_tqueue(tu, &r1);
bfe70783 1385 spin_unlock_irqrestore(&tu->qlock, flags);
1da177e4
LT		 1386 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1387 wake_up(&tu->qchange_sleep);
1388}
1389
40ed9444
TI		 1390static 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
53d2f744 1398static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
1da177e4
LT		 1399 unsigned long resolution,
1400 unsigned long ticks)
1401{
53d2f744 1402 struct snd_timer_user *tu = timeri->callback_data;
07094ae6 1403 struct snd_timer_tread64 *r, r1;
fcae40c9 1404 struct timespec64 tstamp;
1da177e4
LT		 1405 int prev, append = 0;
1406
a8c006aa 1407 memset(&r1, 0, sizeof(r1));
07799e75 1408 memset(&tstamp, 0, sizeof(tstamp));
1da177e4 1409 spin_lock(&tu->qlock);
6b172a85
CL		 1410 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1411 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
1da177e4
LT		 1412 spin_unlock(&tu->qlock);
1413 return;
1414 }
b751eef1
JK		 1415 if (tu->last_resolution != resolution || ticks > 0) {
1416 if (timer_tstamp_monotonic)
fcae40c9 1417 ktime_get_ts64(&tstamp);
b751eef1 1418 else
fcae40c9 1419 ktime_get_real_ts64(&tstamp);
b751eef1 1420 }
6b172a85
CL		 1421 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1422 tu->last_resolution != resolution) {
1da177e4 1423 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
07094ae6
BW		 1424 r1.tstamp_sec = tstamp.tv_sec;
1425 r1.tstamp_nsec = tstamp.tv_nsec;
1da177e4
LT		 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) {
07094ae6
BW		 1439 r->tstamp_sec = tstamp.tv_sec;
1440 r->tstamp_nsec = tstamp.tv_nsec;
1da177e4
LT		 1441 r->val += ticks;
1442 append++;
1443 goto __wake;
1444 }
1445 }
1446 r1.event = SNDRV_TIMER_EVENT_TICK;
07094ae6
BW		 1447 r1.tstamp_sec = tstamp.tv_sec;
1448 r1.tstamp_nsec = tstamp.tv_nsec;
1da177e4
LT		 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
890e2cb5
TI		 1460static int realloc_user_queue(struct snd_timer_user *tu, int size)
1461{
1462 struct snd_timer_read *queue = NULL;
07094ae6 1463 struct snd_timer_tread64 *tqueue = NULL;
890e2cb5
TI		 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
1da177e4
LT		 1487static int snd_timer_user_open(struct inode *inode, struct file *file)
1488{
53d2f744 1489 struct snd_timer_user *tu;
02f4865f
TI		 1490 int err;
1491
c5bf68fe 1492 err = stream_open(inode, file);
02f4865f
TI		 1493 if (err < 0)
1494 return err;
6b172a85 1495
ca2c0966 1496 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
1da177e4
LT		 1497 if (tu == NULL)
1498 return -ENOMEM;
1499 spin_lock_init(&tu->qlock);
1500 init_waitqueue_head(&tu->qchange_sleep);
af368027 1501 mutex_init(&tu->ioctl_lock);
1da177e4 1502 tu->ticks = 1;
890e2cb5 1503 if (realloc_user_queue(tu, 128) < 0) {
1da177e4
LT		 1504 kfree(tu);
1505 return -ENOMEM;
1506 }
1507 file->private_data = tu;
1508 return 0;
1509}
1510
1511static int snd_timer_user_release(struct inode *inode, struct file *file)
1512{
53d2f744 1513 struct snd_timer_user *tu;
1da177e4
LT		 1514
1515 if (file->private_data) {
1516 tu = file->private_data;
1517 file->private_data = NULL;
af368027 1518 mutex_lock(&tu->ioctl_lock);
6a34367e 1519 if (tu->timeri) {
1da177e4 1520 snd_timer_close(tu->timeri);
6a34367e
TI		 1521 snd_timer_instance_free(tu->timeri);
1522 }
af368027 1523 mutex_unlock(&tu->ioctl_lock);
1da177e4
LT		 1524 kfree(tu->queue);
1525 kfree(tu->tqueue);
1526 kfree(tu);
1527 }
1528 return 0;
1529}
1530
53d2f744 1531static void snd_timer_user_zero_id(struct snd_timer_id *id)
1da177e4
LT		 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
53d2f744 1540static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
1da177e4
LT		 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
53d2f744 1549static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
1da177e4 1550{
53d2f744
TI		 1551 struct snd_timer_id id;
1552 struct snd_timer *timer;
1da177e4 1553 struct list_head *p;
6b172a85 1554
1da177e4
LT		 1555 if (copy_from_user(&id, _tid, sizeof(id)))
1556 return -EFAULT;
1a60d4c5 1557 mutex_lock(&register_mutex);
1da177e4
LT		 1558 if (id.dev_class < 0) { /* first item */
1559 if (list_empty(&snd_timer_list))
1560 snd_timer_user_zero_id(&id);
1561 else {
9dfba380 1562 timer = list_entry(snd_timer_list.next,
53d2f744 1563 struct snd_timer, device_list);
1da177e4
LT		 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) {
53d2f744 1571 timer = list_entry(p, struct snd_timer, device_list);
1da177e4
LT		 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 {
e8ed6820
DC		 1589 if (id.device < 0) {
1590 id.device = 0;
1da177e4 1591 } else {
e8ed6820
DC		 1592 if (id.subdevice < 0)
1593 id.subdevice = 0;
b41f794f 1594 else if (id.subdevice < INT_MAX)
e8ed6820 1595 id.subdevice++;
1da177e4
LT		 1596 }
1597 }
1598 list_for_each(p, &snd_timer_list) {
53d2f744 1599 timer = list_entry(p, struct snd_timer, device_list);
1da177e4
LT		 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 }
1a60d4c5 1634 mutex_unlock(&register_mutex);
1da177e4
LT		 1635 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1636 return -EFAULT;
1637 return 0;
6b172a85 1638}
1da177e4 1639
6b172a85 1640static int snd_timer_user_ginfo(struct file *file,
53d2f744 1641 struct snd_timer_ginfo __user *_ginfo)
1da177e4 1642{
53d2f744
TI		 1643 struct snd_timer_ginfo *ginfo;
1644 struct snd_timer_id tid;
1645 struct snd_timer *t;
1da177e4
LT		 1646 struct list_head *p;
1647 int err = 0;
1648
ef44a1ec
LZ		 1649 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1650 if (IS_ERR(ginfo))
1651 return PTR_ERR(ginfo);
1652
1da177e4
LT		 1653 tid = ginfo->tid;
1654 memset(ginfo, 0, sizeof(*ginfo));
1655 ginfo->tid = tid;
1a60d4c5 1656 mutex_lock(&register_mutex);
1da177e4
LT		 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 }
1a60d4c5 1675 mutex_unlock(&register_mutex);
1da177e4
LT		 1676 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1677 err = -EFAULT;
1678 kfree(ginfo);
1679 return err;
1680}
1681
91d2178e 1682static int timer_set_gparams(struct snd_timer_gparams *gparams)
1da177e4 1683{
53d2f744 1684 struct snd_timer *t;
1da177e4
LT		 1685 int err;
1686
1a60d4c5 1687 mutex_lock(&register_mutex);
91d2178e 1688 t = snd_timer_find(&gparams->tid);
6b172a85 1689 if (!t) {
1da177e4 1690 err = -ENODEV;
6b172a85
CL		 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;
1da177e4 1700 }
91d2178e 1701 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
6b172a85 1702_error:
1a60d4c5 1703 mutex_unlock(&register_mutex);
1da177e4
LT		 1704 return err;
1705}
1706
91d2178e
TS		 1707static 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
6b172a85 1717static int snd_timer_user_gstatus(struct file *file,
53d2f744 1718 struct snd_timer_gstatus __user *_gstatus)
1da177e4 1719{
53d2f744
TI		 1720 struct snd_timer_gstatus gstatus;
1721 struct snd_timer_id tid;
1722 struct snd_timer *t;
1da177e4
LT		 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;
1a60d4c5 1730 mutex_lock(&register_mutex);
1da177e4
LT		 1731 t = snd_timer_find(&tid);
1732 if (t != NULL) {
9d4d207d 1733 spin_lock_irq(&t->lock);
fdcb5761 1734 gstatus.resolution = snd_timer_hw_resolution(t);
1da177e4 1735 if (t->hw.precise_resolution) {
6b172a85
CL		 1736 t->hw.precise_resolution(t, &gstatus.resolution_num,
1737 &gstatus.resolution_den);
1da177e4
LT		 1738 } else {
1739 gstatus.resolution_num = gstatus.resolution;
1740 gstatus.resolution_den = 1000000000uL;
1741 }
9d4d207d 1742 spin_unlock_irq(&t->lock);
1da177e4
LT		 1743 } else {
1744 err = -ENODEV;
1745 }
1a60d4c5 1746 mutex_unlock(&register_mutex);
1da177e4
LT		 1747 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1748 err = -EFAULT;
1749 return err;
1750}
1751
6b172a85 1752static int snd_timer_user_tselect(struct file *file,
53d2f744 1753 struct snd_timer_select __user *_tselect)
1da177e4 1754{
53d2f744
TI		 1755 struct snd_timer_user *tu;
1756 struct snd_timer_select tselect;
1da177e4 1757 char str[32];
c1935b4d 1758 int err = 0;
6b172a85 1759
1da177e4 1760 tu = file->private_data;
c1935b4d 1761 if (tu->timeri) {
1da177e4 1762 snd_timer_close(tu->timeri);
6a34367e 1763 snd_timer_instance_free(tu->timeri);
c1935b4d
JK		 1764 tu->timeri = NULL;
1765 }
1766 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1767 err = -EFAULT;
1768 goto __err;
1769 }
1da177e4
LT		 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;
6a34367e
TI		 1773 tu->timeri = snd_timer_instance_new(str);
1774 if (!tu->timeri) {
1775 err = -ENOMEM;
c1935b4d 1776 goto __err;
6a34367e 1777 }
1da177e4 1778
890e2cb5
TI		 1779 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
1780 tu->timeri->callback = tu->tread
6b172a85 1781 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
890e2cb5
TI		 1782 tu->timeri->ccallback = snd_timer_user_ccallback;
1783 tu->timeri->callback_data = (void *)tu;
1784 tu->timeri->disconnect = snd_timer_user_disconnect;
c1935b4d 1785
6a34367e
TI		 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
c1935b4d 1792 __err:
c1935b4d 1793 return err;
1da177e4
LT		 1794}
1795
6b172a85 1796static int snd_timer_user_info(struct file *file,
53d2f744 1797 struct snd_timer_info __user *_info)
1da177e4 1798{
53d2f744
TI		 1799 struct snd_timer_user *tu;
1800 struct snd_timer_info *info;
1801 struct snd_timer *t;
1da177e4
LT		 1802 int err = 0;
1803
1804 tu = file->private_data;
7c64ec34
CL		 1805 if (!tu->timeri)
1806 return -EBADFD;
1da177e4 1807 t = tu->timeri->timer;
7c64ec34
CL		 1808 if (!t)
1809 return -EBADFD;
1da177e4 1810
ca2c0966 1811 info = kzalloc(sizeof(*info), GFP_KERNEL);
1da177e4
LT		 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
6b172a85 1826static int snd_timer_user_params(struct file *file,
53d2f744 1827 struct snd_timer_params __user *_params)
1da177e4 1828{
53d2f744
TI		 1829 struct snd_timer_user *tu;
1830 struct snd_timer_params params;
1831 struct snd_timer *t;
1da177e4 1832 int err;
6b172a85 1833
1da177e4 1834 tu = file->private_data;
7c64ec34
CL		 1835 if (!tu->timeri)
1836 return -EBADFD;
1da177e4 1837 t = tu->timeri->timer;
7c64ec34
CL		 1838 if (!t)
1839 return -EBADFD;
1da177e4
LT		 1840 if (copy_from_user(&params, _params, sizeof(params)))
1841 return -EFAULT;
71321eb3
TI		 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 }
1da177e4 1857 }
6b172a85
CL		 1858 if (params.queue_size > 0 &&
1859 (params.queue_size < 32 || params.queue_size > 1024)) {
1da177e4
LT		 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)|
a501dfa3
JK		 1869 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1870 (1<<SNDRV_TIMER_EVENT_RESUME)|
1da177e4
LT		 1871 (1<<SNDRV_TIMER_EVENT_MSTART)|
1872 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1873 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
65d11d95
JK		 1874 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1875 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
a501dfa3 1876 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
1da177e4
LT		 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);
6b172a85
CL		 1892 if (params.queue_size > 0 &&
1893 (unsigned int)tu->queue_size != params.queue_size) {
890e2cb5
TI		 1894 err = realloc_user_queue(tu, params.queue_size);
1895 if (err < 0)
1896 goto _end;
1da177e4 1897 }
d7f910bf 1898 spin_lock_irq(&tu->qlock);
1da177e4
LT		 1899 tu->qhead = tu->qtail = tu->qused = 0;
1900 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1901 if (tu->tread) {
07094ae6 1902 struct snd_timer_tread64 tread;
cec8f96e 1903 memset(&tread, 0, sizeof(tread));
1da177e4 1904 tread.event = SNDRV_TIMER_EVENT_EARLY;
07094ae6
BW		 1905 tread.tstamp_sec = 0;
1906 tread.tstamp_nsec = 0;
1da177e4
LT		 1907 tread.val = 0;
1908 snd_timer_user_append_to_tqueue(tu, &tread);
1909 } else {
53d2f744 1910 struct snd_timer_read *r = &tu->queue[0];
1da177e4
LT		 1911 r->resolution = 0;
1912 r->ticks = 0;
1913 tu->qused++;
1914 tu->qtail++;
1915 }
1da177e4
LT		 1916 }
1917 tu->filter = params.filter;
1918 tu->ticks = params.ticks;
d7f910bf 1919 spin_unlock_irq(&tu->qlock);
1da177e4
LT		 1920 err = 0;
1921 _end:
1922 if (copy_to_user(_params, &params, sizeof(params)))
1923 return -EFAULT;
1924 return err;
1925}
1926
a07804cc
BW		 1927static 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
1950static int snd_timer_user_status64(struct file *file,
1951 struct snd_timer_status64 __user *_status)
1da177e4 1952{
53d2f744 1953 struct snd_timer_user *tu;
a07804cc 1954 struct snd_timer_status64 status;
6b172a85 1955
1da177e4 1956 tu = file->private_data;
7c64ec34
CL		 1957 if (!tu->timeri)
1958 return -EBADFD;
1da177e4 1959 memset(&status, 0, sizeof(status));
a07804cc
BW		 1960 status.tstamp_sec = tu->tstamp.tv_sec;
1961 status.tstamp_nsec = tu->tstamp.tv_nsec;
1da177e4
LT		 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
1973static int snd_timer_user_start(struct file *file)
1974{
1975 int err;
53d2f744 1976 struct snd_timer_user *tu;
6b172a85 1977
1da177e4 1978 tu = file->private_data;
7c64ec34
CL		 1979 if (!tu->timeri)
1980 return -EBADFD;
1da177e4
LT		 1981 snd_timer_stop(tu->timeri);
1982 tu->timeri->lost = 0;
1983 tu->last_resolution = 0;
5d704b0d
TI		 1984 err = snd_timer_start(tu->timeri, tu->ticks);
1985 if (err < 0)
1986 return err;
1987 return 0;
1da177e4
LT		 1988}
1989
1990static int snd_timer_user_stop(struct file *file)
1991{
1992 int err;
53d2f744 1993 struct snd_timer_user *tu;
6b172a85 1994
1da177e4 1995 tu = file->private_data;
7c64ec34
CL		 1996 if (!tu->timeri)
1997 return -EBADFD;
5d704b0d
TI		 1998 err = snd_timer_stop(tu->timeri);
1999 if (err < 0)
2000 return err;
2001 return 0;
1da177e4
LT		 2002}
2003
2004static int snd_timer_user_continue(struct file *file)
2005{
2006 int err;
53d2f744 2007 struct snd_timer_user *tu;
6b172a85 2008
1da177e4 2009 tu = file->private_data;
7c64ec34
CL		 2010 if (!tu->timeri)
2011 return -EBADFD;
9f8a7658
TI		 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);
1da177e4 2015 tu->timeri->lost = 0;
5d704b0d
TI		 2016 err = snd_timer_continue(tu->timeri);
2017 if (err < 0)
2018 return err;
2019 return 0;
1da177e4
LT		 2020}
2021
15790a6b
TI		 2022static int snd_timer_user_pause(struct file *file)
2023{
2024 int err;
53d2f744 2025 struct snd_timer_user *tu;
6b172a85 2026
15790a6b 2027 tu = file->private_data;
7c64ec34
CL		 2028 if (!tu->timeri)
2029 return -EBADFD;
5d704b0d
TI		 2030 err = snd_timer_pause(tu->timeri);
2031 if (err < 0)
2032 return err;
2033 return 0;
15790a6b
TI		 2034}
2035
07094ae6
BW		 2036static 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
8c50b37c
TI		 2066enum {
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
af368027 2073static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
07094ae6 2074 unsigned long arg, bool compat)
1da177e4 2075{
53d2f744 2076 struct snd_timer_user *tu;
1da177e4
LT		 2077 void __user *argp = (void __user *)arg;
2078 int __user *p = argp;
6b172a85 2079
1da177e4
LT		 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);
07094ae6
BW		 2086 case SNDRV_TIMER_IOCTL_TREAD_OLD:
2087 case SNDRV_TIMER_IOCTL_TREAD64:
2088 return snd_timer_user_tread(argp, tu, cmd, compat);
1da177e4
LT		 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);
a07804cc
BW		 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);
1da177e4 2105 case SNDRV_TIMER_IOCTL_START:
8c50b37c 2106 case SNDRV_TIMER_IOCTL_START_OLD:
1da177e4
LT		 2107 return snd_timer_user_start(file);
2108 case SNDRV_TIMER_IOCTL_STOP:
8c50b37c 2109 case SNDRV_TIMER_IOCTL_STOP_OLD:
1da177e4
LT		 2110 return snd_timer_user_stop(file);
2111 case SNDRV_TIMER_IOCTL_CONTINUE:
8c50b37c 2112 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
1da177e4 2113 return snd_timer_user_continue(file);
15790a6b 2114 case SNDRV_TIMER_IOCTL_PAUSE:
8c50b37c 2115 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
15790a6b 2116 return snd_timer_user_pause(file);
1da177e4
LT		 2117 }
2118 return -ENOTTY;
2119}
2120
af368027
TI		 2121static 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);
07094ae6 2128 ret = __snd_timer_user_ioctl(file, cmd, arg, false);
af368027
TI		 2129 mutex_unlock(&tu->ioctl_lock);
2130 return ret;
2131}
2132
1da177e4
LT		 2133static int snd_timer_user_fasync(int fd, struct file * file, int on)
2134{
53d2f744 2135 struct snd_timer_user *tu;
6b172a85 2136
1da177e4 2137 tu = file->private_data;
60aa4924 2138 return fasync_helper(fd, file, on, &tu->fasync);
1da177e4
LT		 2139}
2140
6b172a85
CL		 2141static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
2142 size_t count, loff_t *offset)
1da177e4 2143{
07094ae6
BW		 2144 struct snd_timer_tread64 *tread;
2145 struct snd_timer_tread32 tread32;
53d2f744 2146 struct snd_timer_user *tu;
1da177e4 2147 long result = 0, unit;
4dff5c7b 2148 int qhead;
1da177e4 2149 int err = 0;
6b172a85 2150
1da177e4 2151 tu = file->private_data;
07094ae6
BW		 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
d11662f4 2167 mutex_lock(&tu->ioctl_lock);
1da177e4
LT		 2168 spin_lock_irq(&tu->qlock);
2169 while ((long)count - result >= unit) {
2170 while (!tu->qused) {
ac6424b9 2171 wait_queue_entry_t wait;
1da177e4
LT		 2172
2173 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
2174 err = -EAGAIN;
4dff5c7b 2175 goto _error;
1da177e4
LT		 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);
d11662f4 2183 mutex_unlock(&tu->ioctl_lock);
1da177e4 2184 schedule();
d11662f4 2185 mutex_lock(&tu->ioctl_lock);
1da177e4
LT		 2186 spin_lock_irq(&tu->qlock);
2187
2188 remove_wait_queue(&tu->qchange_sleep, &wait);
2189
230323da
TI		 2190 if (tu->disconnected) {
2191 err = -ENODEV;
4dff5c7b 2192 goto _error;
230323da 2193 }
1da177e4
LT		 2194 if (signal_pending(current)) {
2195 err = -ERESTARTSYS;
4dff5c7b 2196 goto _error;
1da177e4
LT		 2197 }
2198 }
2199
4dff5c7b
TI		 2200 qhead = tu->qhead++;
2201 tu->qhead %= tu->queue_size;
3fa6993f 2202 tu->qused--;
1da177e4 2203 spin_unlock_irq(&tu->qlock);
1da177e4 2204
07094ae6
BW		 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)))
1da177e4 2211 err = -EFAULT;
07094ae6
BW		 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,
f9993480 2218 .tstamp_nsec = tread->tstamp_nsec,
07094ae6
BW		 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:
4dff5c7b
TI		 2226 if (copy_to_user(buffer, &tu->queue[qhead],
2227 sizeof(struct snd_timer_read)))
1da177e4 2228 err = -EFAULT;
07094ae6
BW		 2229 break;
2230 default:
2231 err = -ENOTSUPP;
2232 break;
1da177e4
LT		 2233 }
2234
1da177e4 2235 spin_lock_irq(&tu->qlock);
4dff5c7b
TI		 2236 if (err < 0)
2237 goto _error;
2238 result += unit;
2239 buffer += unit;
1da177e4 2240 }
1da177e4 2241 _error:
4dff5c7b 2242 spin_unlock_irq(&tu->qlock);
d11662f4 2243 mutex_unlock(&tu->ioctl_lock);
1da177e4
LT		 2244 return result > 0 ? result : err;
2245}
2246
680ef72a 2247static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait)
1da177e4 2248{
680ef72a 2249 __poll_t mask;
53d2f744 2250 struct snd_timer_user *tu;
1da177e4
LT		 2251
2252 tu = file->private_data;
2253
2254 poll_wait(file, &tu->qchange_sleep, wait);
6b172a85 2255
1da177e4 2256 mask = 0;
d7f910bf 2257 spin_lock_irq(&tu->qlock);
1da177e4 2258 if (tu->qused)
a9a08845 2259 mask |= EPOLLIN | EPOLLRDNORM;
230323da 2260 if (tu->disconnected)
a9a08845 2261 mask |= EPOLLERR;
d7f910bf 2262 spin_unlock_irq(&tu->qlock);
1da177e4
LT		 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
9c2e08c5 2273static const struct file_operations snd_timer_f_ops =
1da177e4
LT		 2274{
2275 .owner = THIS_MODULE,
2276 .read = snd_timer_user_read,
2277 .open = snd_timer_user_open,
2278 .release = snd_timer_user_release,
02f4865f 2279 .llseek = no_llseek,
1da177e4
LT		 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
7c35860d
TI		 2286/* unregister the system timer */
2287static 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
89da061f
TI		 2295static struct device timer_dev;
2296
1da177e4
LT		 2297/*
2298 * ENTRY functions
2299 */
2300
1da177e4
LT		 2301static int __init alsa_timer_init(void)
2302{
2303 int err;
1da177e4 2304
89da061f
TI		 2305 snd_device_initialize(&timer_dev, NULL);
2306 dev_set_name(&timer_dev, "timer");
2307
1da177e4 2308#ifdef SNDRV_OSS_INFO_DEV_TIMERS
6b172a85
CL		 2309 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2310 "system timer");
1da177e4 2311#endif
e28563cc 2312
7c35860d
TI		 2313 err = snd_timer_register_system();
2314 if (err < 0) {
cf74dcf3 2315 pr_err("ALSA: unable to register system timer (%i)\n", err);
1ae0e4ce 2316 goto put_timer;
7c35860d
TI		 2317 }
2318
40a4b263
TI		 2319 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2320 &snd_timer_f_ops, NULL, &timer_dev);
7c35860d 2321 if (err < 0) {
cf74dcf3 2322 pr_err("ALSA: unable to register timer device (%i)\n", err);
7c35860d 2323 snd_timer_free_all();
1ae0e4ce 2324 goto put_timer;
7c35860d
TI		 2325 }
2326
e28563cc 2327 snd_timer_proc_init();
1da177e4 2328 return 0;
1ae0e4ce
ME		 2329
2330put_timer:
2331 put_device(&timer_dev);
2332 return err;
1da177e4
LT		 2333}
2334
2335static void __exit alsa_timer_exit(void)
2336{
40a4b263 2337 snd_unregister_device(&timer_dev);
7c35860d 2338 snd_timer_free_all();
89da061f 2339 put_device(&timer_dev);
e28563cc 2340 snd_timer_proc_done();
1da177e4
LT		 2341#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2342 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2343#endif
2344}
2345
2346module_init(alsa_timer_init)
2347module_exit(alsa_timer_exit)
Linux 6.x block layer and io_uring tree(s)