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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Timers abstract layer
Jaroslav Kyselac1017a42007-10-15 09:50:19 +02003 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/delay.h>
23#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/slab.h>
25#include <linux/time.h>
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010026#include <linux/mutex.h>
Paul Gortmaker51990e82012-01-22 11:23:42 -050027#include <linux/device.h>
Paul Gortmaker65a77212011-07-15 13:13:37 -040028#include <linux/module.h>
Paulo Marques543537b2005-06-23 00:09:02 -070029#include <linux/string.h>
Ingo Molnar174cd4b2017-02-02 19:15:33 +010030#include <linux/sched/signal.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <sound/core.h>
32#include <sound/timer.h>
33#include <sound/control.h>
34#include <sound/info.h>
35#include <sound/minors.h>
36#include <sound/initval.h>
37#include <linux/kmod.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Takashi Iwai9f8a7652016-09-07 15:45:31 +020039/* internal flags */
40#define SNDRV_TIMER_IFLG_PAUSED 0x00010000
41
Takashi Iwai8eeaa2f2014-02-10 09:48:47 +010042#if IS_ENABLED(CONFIG_SND_HRTIMER)
Clemens Ladisch109fef92010-11-18 09:53:54 +010043#define DEFAULT_TIMER_LIMIT 4
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#else
45#define DEFAULT_TIMER_LIMIT 1
46#endif
47
48static int timer_limit = DEFAULT_TIMER_LIMIT;
Jaroslav Kyselab751eef2007-12-13 10:19:42 +010049static int timer_tstamp_monotonic = 1;
Jaroslav Kyselac1017a42007-10-15 09:50:19 +020050MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
Linus Torvalds1da177e2005-04-16 15:20:36 -070051MODULE_DESCRIPTION("ALSA timer interface");
52MODULE_LICENSE("GPL");
53module_param(timer_limit, int, 0444);
54MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
Jaroslav Kyselab751eef2007-12-13 10:19:42 +010055module_param(timer_tstamp_monotonic, int, 0444);
56MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Kay Sievers03cfe6f2010-11-23 17:43:19 +010058MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
59MODULE_ALIAS("devname:snd/timer");
60
Takashi Iwai53d2f742005-11-17 13:56:05 +010061struct snd_timer_user {
62 struct snd_timer_instance *timeri;
Clemens Ladisch6b172a82005-10-12 17:20:21 +020063 int tread; /* enhanced read with timestamps and events */
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 unsigned long ticks;
65 unsigned long overrun;
66 int qhead;
67 int qtail;
68 int qused;
69 int queue_size;
Takashi Iwai230323d2016-01-21 17:19:31 +010070 bool disconnected;
Takashi Iwai53d2f742005-11-17 13:56:05 +010071 struct snd_timer_read *queue;
72 struct snd_timer_tread *tqueue;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 spinlock_t qlock;
74 unsigned long last_resolution;
75 unsigned int filter;
76 struct timespec tstamp; /* trigger tstamp */
77 wait_queue_head_t qchange_sleep;
78 struct fasync_struct *fasync;
Takashi Iwaiaf368022016-01-13 17:48:01 +010079 struct mutex ioctl_lock;
Takashi Iwai53d2f742005-11-17 13:56:05 +010080};
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82/* list of timers */
83static LIST_HEAD(snd_timer_list);
84
85/* list of slave instances */
86static LIST_HEAD(snd_timer_slave_list);
87
88/* lock for slave active lists */
89static DEFINE_SPINLOCK(slave_active_lock);
90
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010091static DEFINE_MUTEX(register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Takashi Iwai53d2f742005-11-17 13:56:05 +010093static int snd_timer_free(struct snd_timer *timer);
94static int snd_timer_dev_free(struct snd_device *device);
95static int snd_timer_dev_register(struct snd_device *device);
Takashi Iwaic4614822006-06-23 14:38:23 +020096static int snd_timer_dev_disconnect(struct snd_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Takashi Iwai53d2f742005-11-17 13:56:05 +010098static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100/*
101 * create a timer instance with the given owner string.
102 * when timer is not NULL, increments the module counter
103 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100104static struct snd_timer_instance *snd_timer_instance_new(char *owner,
105 struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100107 struct snd_timer_instance *timeri;
Takashi Iwaica2c0962005-09-09 14:20:23 +0200108 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 if (timeri == NULL)
110 return NULL;
Paulo Marques543537b2005-06-23 00:09:02 -0700111 timeri->owner = kstrdup(owner, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 if (! timeri->owner) {
113 kfree(timeri);
114 return NULL;
115 }
116 INIT_LIST_HEAD(&timeri->open_list);
117 INIT_LIST_HEAD(&timeri->active_list);
118 INIT_LIST_HEAD(&timeri->ack_list);
119 INIT_LIST_HEAD(&timeri->slave_list_head);
120 INIT_LIST_HEAD(&timeri->slave_active_head);
121
122 timeri->timer = timer;
Clemens Ladischde242142005-10-12 17:12:31 +0200123 if (timer && !try_module_get(timer->module)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 kfree(timeri->owner);
125 kfree(timeri);
126 return NULL;
127 }
128
129 return timeri;
130}
131
132/*
133 * find a timer instance from the given timer id
134 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100135static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100137 struct snd_timer *timer = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Johannes Berg9244b2c2006-10-05 16:02:22 +0200139 list_for_each_entry(timer, &snd_timer_list, device_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 if (timer->tmr_class != tid->dev_class)
141 continue;
142 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
143 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
144 (timer->card == NULL ||
145 timer->card->number != tid->card))
146 continue;
147 if (timer->tmr_device != tid->device)
148 continue;
149 if (timer->tmr_subdevice != tid->subdevice)
150 continue;
151 return timer;
152 }
153 return NULL;
154}
155
Johannes Bergee2da992008-07-09 10:28:41 +0200156#ifdef CONFIG_MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Takashi Iwai53d2f742005-11-17 13:56:05 +0100158static void snd_timer_request(struct snd_timer_id *tid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 switch (tid->dev_class) {
161 case SNDRV_TIMER_CLASS_GLOBAL:
162 if (tid->device < timer_limit)
163 request_module("snd-timer-%i", tid->device);
164 break;
165 case SNDRV_TIMER_CLASS_CARD:
166 case SNDRV_TIMER_CLASS_PCM:
167 if (tid->card < snd_ecards_limit)
168 request_module("snd-card-%i", tid->card);
169 break;
170 default:
171 break;
172 }
173}
174
175#endif
176
177/*
178 * look for a master instance matching with the slave id of the given slave.
179 * when found, relink the open_link of the slave.
180 *
181 * call this with register_mutex down.
182 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100183static void snd_timer_check_slave(struct snd_timer_instance *slave)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100185 struct snd_timer *timer;
186 struct snd_timer_instance *master;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
188 /* FIXME: it's really dumb to look up all entries.. */
Johannes Berg9244b2c2006-10-05 16:02:22 +0200189 list_for_each_entry(timer, &snd_timer_list, device_list) {
190 list_for_each_entry(master, &timer->open_list_head, open_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 if (slave->slave_class == master->slave_class &&
192 slave->slave_id == master->slave_id) {
Nicolas Kaiser5b7c7572011-03-16 17:10:11 +0100193 list_move_tail(&slave->open_list,
194 &master->slave_list_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 spin_lock_irq(&slave_active_lock);
196 slave->master = master;
197 slave->timer = master->timer;
198 spin_unlock_irq(&slave_active_lock);
199 return;
200 }
201 }
202 }
203}
204
205/*
206 * look for slave instances matching with the slave id of the given master.
207 * when found, relink the open_link of slaves.
208 *
209 * call this with register_mutex down.
210 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100211static void snd_timer_check_master(struct snd_timer_instance *master)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212{
Johannes Berg9244b2c2006-10-05 16:02:22 +0200213 struct snd_timer_instance *slave, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
215 /* check all pending slaves */
Johannes Berg9244b2c2006-10-05 16:02:22 +0200216 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 if (slave->slave_class == master->slave_class &&
218 slave->slave_id == master->slave_id) {
Johannes Berg9244b2c2006-10-05 16:02:22 +0200219 list_move_tail(&slave->open_list, &master->slave_list_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 spin_lock_irq(&slave_active_lock);
Takashi Iwaib5a663a2016-01-14 16:30:58 +0100221 spin_lock(&master->timer->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 slave->master = master;
223 slave->timer = master->timer;
224 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200225 list_add_tail(&slave->active_list,
226 &master->slave_active_head);
Takashi Iwaib5a663a2016-01-14 16:30:58 +0100227 spin_unlock(&master->timer->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 spin_unlock_irq(&slave_active_lock);
229 }
230 }
231}
232
233/*
234 * open a timer instance
235 * when opening a master, the slave id must be here given.
236 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100237int snd_timer_open(struct snd_timer_instance **ti,
238 char *owner, struct snd_timer_id *tid,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 unsigned int slave_id)
240{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100241 struct snd_timer *timer;
242 struct snd_timer_instance *timeri = NULL;
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200243
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
245 /* open a slave instance */
246 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
247 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
Takashi Iwaicf74dcf2014-02-04 18:22:39 +0100248 pr_debug("ALSA: timer: invalid slave class %i\n",
249 tid->dev_sclass);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 return -EINVAL;
251 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100252 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 timeri = snd_timer_instance_new(owner, NULL);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200254 if (!timeri) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100255 mutex_unlock(&register_mutex);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200256 return -ENOMEM;
257 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 timeri->slave_class = tid->dev_sclass;
259 timeri->slave_id = tid->device;
260 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
261 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
262 snd_timer_check_slave(timeri);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100263 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 *ti = timeri;
265 return 0;
266 }
267
268 /* open a master instance */
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100269 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 timer = snd_timer_find(tid);
Johannes Bergee2da992008-07-09 10:28:41 +0200271#ifdef CONFIG_MODULES
272 if (!timer) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100273 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 snd_timer_request(tid);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100275 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 timer = snd_timer_find(tid);
277 }
278#endif
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200279 if (!timer) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100280 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 return -ENODEV;
282 }
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200283 if (!list_empty(&timer->open_list_head)) {
284 timeri = list_entry(timer->open_list_head.next,
Takashi Iwai53d2f742005-11-17 13:56:05 +0100285 struct snd_timer_instance, open_list);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200286 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100287 mutex_unlock(&register_mutex);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200288 return -EBUSY;
289 }
290 }
291 timeri = snd_timer_instance_new(owner, timer);
292 if (!timeri) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100293 mutex_unlock(&register_mutex);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200294 return -ENOMEM;
295 }
Takashi Iwai230323d2016-01-21 17:19:31 +0100296 /* take a card refcount for safe disconnection */
297 if (timer->card)
298 get_device(&timer->card->card_dev);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200299 timeri->slave_class = tid->dev_sclass;
300 timeri->slave_id = slave_id;
Vegard Nossum8ddc0562016-08-29 00:33:51 +0200301
302 if (list_empty(&timer->open_list_head) && timer->hw.open) {
303 int err = timer->hw.open(timer);
304 if (err) {
305 kfree(timeri->owner);
306 kfree(timeri);
307
308 if (timer->card)
309 put_device(&timer->card->card_dev);
310 module_put(timer->module);
311 mutex_unlock(&register_mutex);
312 return err;
313 }
314 }
315
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200316 list_add_tail(&timeri->open_list, &timer->open_list_head);
317 snd_timer_check_master(timeri);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100318 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 *ti = timeri;
320 return 0;
321}
322
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323/*
324 * close a timer instance
325 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100326int snd_timer_close(struct snd_timer_instance *timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100328 struct snd_timer *timer = NULL;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200329 struct snd_timer_instance *slave, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
Takashi Iwai00728892008-08-14 07:51:57 +0200331 if (snd_BUG_ON(!timeri))
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200332 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Takashi Iwai9984d1b2016-02-10 11:53:30 +0100334 mutex_lock(&register_mutex);
335 list_del(&timeri->open_list);
336
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 /* force to stop the timer */
338 snd_timer_stop(timeri);
339
Takashi Iwai9984d1b2016-02-10 11:53:30 +0100340 timer = timeri->timer;
341 if (timer) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 /* wait, until the active callback is finished */
343 spin_lock_irq(&timer->lock);
344 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
345 spin_unlock_irq(&timer->lock);
346 udelay(10);
347 spin_lock_irq(&timer->lock);
348 }
349 spin_unlock_irq(&timer->lock);
Takashi Iwai9984d1b2016-02-10 11:53:30 +0100350
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 /* remove slave links */
Takashi Iwaib5a663a2016-01-14 16:30:58 +0100352 spin_lock_irq(&slave_active_lock);
353 spin_lock(&timer->lock);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200354 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
355 open_list) {
Johannes Berg9244b2c2006-10-05 16:02:22 +0200356 list_move_tail(&slave->open_list, &snd_timer_slave_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 slave->master = NULL;
358 slave->timer = NULL;
Takashi Iwaib5a663a2016-01-14 16:30:58 +0100359 list_del_init(&slave->ack_list);
360 list_del_init(&slave->active_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 }
Takashi Iwaib5a663a2016-01-14 16:30:58 +0100362 spin_unlock(&timer->lock);
363 spin_unlock_irq(&slave_active_lock);
Takashi Iwai9984d1b2016-02-10 11:53:30 +0100364
365 /* slave doesn't need to release timer resources below */
366 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
367 timer = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 }
Takashi Iwai9984d1b2016-02-10 11:53:30 +0100369
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 if (timeri->private_free)
371 timeri->private_free(timeri);
372 kfree(timeri->owner);
373 kfree(timeri);
Takashi Iwai9984d1b2016-02-10 11:53:30 +0100374
375 if (timer) {
376 if (list_empty(&timer->open_list_head) && timer->hw.close)
377 timer->hw.close(timer);
378 /* release a card refcount for safe disconnection */
379 if (timer->card)
380 put_device(&timer->card->card_dev);
Clemens Ladischde242142005-10-12 17:12:31 +0200381 module_put(timer->module);
Takashi Iwai9984d1b2016-02-10 11:53:30 +0100382 }
383
384 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 return 0;
386}
387
Takashi Iwai53d2f742005-11-17 13:56:05 +0100388unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100390 struct snd_timer * timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
392 if (timeri == NULL)
393 return 0;
394 if ((timer = timeri->timer) != NULL) {
395 if (timer->hw.c_resolution)
396 return timer->hw.c_resolution(timer);
397 return timer->hw.resolution;
398 }
399 return 0;
400}
401
Takashi Iwai53d2f742005-11-17 13:56:05 +0100402static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100404 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 unsigned long resolution = 0;
Takashi Iwai53d2f742005-11-17 13:56:05 +0100406 struct snd_timer_instance *ts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 struct timespec tstamp;
408
Jaroslav Kyselab751eef2007-12-13 10:19:42 +0100409 if (timer_tstamp_monotonic)
Thomas Gleixner26204e02014-06-11 23:59:14 +0000410 ktime_get_ts(&tstamp);
Jaroslav Kyselab751eef2007-12-13 10:19:42 +0100411 else
412 getnstimeofday(&tstamp);
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200413 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
414 event > SNDRV_TIMER_EVENT_PAUSE))
415 return;
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200416 if (event == SNDRV_TIMER_EVENT_START ||
417 event == SNDRV_TIMER_EVENT_CONTINUE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 resolution = snd_timer_resolution(ti);
419 if (ti->ccallback)
Jaroslav Kyselab30477d2010-03-03 11:05:55 +0100420 ti->ccallback(ti, event, &tstamp, resolution);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
422 return;
423 timer = ti->timer;
424 if (timer == NULL)
425 return;
426 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
427 return;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200428 list_for_each_entry(ts, &ti->slave_active_head, active_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 if (ts->ccallback)
Takashi Iwai117159f2016-02-08 17:36:25 +0100430 ts->ccallback(ts, event + 100, &tstamp, resolution);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431}
432
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100433/* start/continue a master timer */
434static int snd_timer_start1(struct snd_timer_instance *timeri,
435 bool start, unsigned long ticks)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436{
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100437 struct snd_timer *timer;
438 int result;
439 unsigned long flags;
440
441 timer = timeri->timer;
442 if (!timer)
443 return -EINVAL;
444
445 spin_lock_irqsave(&timer->lock, flags);
446 if (timer->card && timer->card->shutdown) {
447 result = -ENODEV;
448 goto unlock;
449 }
450 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
451 SNDRV_TIMER_IFLG_START)) {
452 result = -EBUSY;
453 goto unlock;
454 }
455
456 if (start)
457 timeri->ticks = timeri->cticks = ticks;
458 else if (!timeri->cticks)
459 timeri->cticks = 1;
460 timeri->pticks = 0;
461
Nicolas Kaiser5b7c7572011-03-16 17:10:11 +0100462 list_move_tail(&timeri->active_list, &timer->active_list_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 if (timer->running) {
464 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
465 goto __start_now;
466 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
467 timeri->flags |= SNDRV_TIMER_IFLG_START;
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100468 result = 1; /* delayed start */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 } else {
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100470 if (start)
471 timer->sticks = ticks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 timer->hw.start(timer);
473 __start_now:
474 timer->running++;
475 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100476 result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 }
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100478 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
479 SNDRV_TIMER_EVENT_CONTINUE);
480 unlock:
481 spin_unlock_irqrestore(&timer->lock, flags);
482 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483}
484
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100485/* start/continue a slave timer */
486static int snd_timer_start_slave(struct snd_timer_instance *timeri,
487 bool start)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488{
489 unsigned long flags;
490
491 spin_lock_irqsave(&slave_active_lock, flags);
Takashi Iwaif784beb2016-01-30 23:09:08 +0100492 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
493 spin_unlock_irqrestore(&slave_active_lock, flags);
494 return -EBUSY;
495 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
Takashi Iwaib5a663a2016-01-14 16:30:58 +0100497 if (timeri->master && timeri->timer) {
498 spin_lock(&timeri->timer->lock);
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200499 list_add_tail(&timeri->active_list,
500 &timeri->master->slave_active_head);
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100501 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
502 SNDRV_TIMER_EVENT_CONTINUE);
Takashi Iwaib5a663a2016-01-14 16:30:58 +0100503 spin_unlock(&timeri->timer->lock);
504 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 spin_unlock_irqrestore(&slave_active_lock, flags);
506 return 1; /* delayed start */
507}
508
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100509/* stop/pause a master timer */
510static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100512 struct snd_timer *timer;
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100513 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 unsigned long flags;
515
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 timer = timeri->timer;
517 if (!timer)
518 return -EINVAL;
519 spin_lock_irqsave(&timer->lock, flags);
Takashi Iwaif784beb2016-01-30 23:09:08 +0100520 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
521 SNDRV_TIMER_IFLG_START))) {
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100522 result = -EBUSY;
523 goto unlock;
Takashi Iwaif784beb2016-01-30 23:09:08 +0100524 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 list_del_init(&timeri->ack_list);
526 list_del_init(&timeri->active_list);
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100527 if (timer->card && timer->card->shutdown)
528 goto unlock;
529 if (stop) {
530 timeri->cticks = timeri->ticks;
531 timeri->pticks = 0;
Takashi Iwai230323d2016-01-21 17:19:31 +0100532 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
534 !(--timer->running)) {
535 timer->hw.stop(timer);
536 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
537 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
538 snd_timer_reschedule(timer, 0);
539 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
540 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
541 timer->hw.start(timer);
542 }
543 }
544 }
Takashi Iwaic3b16812016-01-14 17:01:46 +0100545 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
Takashi Iwai9f8a7652016-09-07 15:45:31 +0200546 if (stop)
547 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED;
548 else
549 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100550 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
551 SNDRV_TIMER_EVENT_CONTINUE);
552 unlock:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 spin_unlock_irqrestore(&timer->lock, flags);
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100554 return result;
555}
556
557/* stop/pause a slave timer */
558static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
559{
560 unsigned long flags;
561
562 spin_lock_irqsave(&slave_active_lock, flags);
563 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) {
564 spin_unlock_irqrestore(&slave_active_lock, flags);
565 return -EBUSY;
566 }
567 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
568 if (timeri->timer) {
569 spin_lock(&timeri->timer->lock);
570 list_del_init(&timeri->ack_list);
571 list_del_init(&timeri->active_list);
572 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
573 SNDRV_TIMER_EVENT_CONTINUE);
574 spin_unlock(&timeri->timer->lock);
575 }
576 spin_unlock_irqrestore(&slave_active_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 return 0;
578}
579
580/*
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100581 * start the timer instance
582 */
583int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
584{
585 if (timeri == NULL || ticks < 1)
586 return -EINVAL;
587 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
588 return snd_timer_start_slave(timeri, true);
589 else
590 return snd_timer_start1(timeri, true, ticks);
591}
592
593/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 * stop the timer instance.
595 *
596 * do not call this from the timer callback!
597 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100598int snd_timer_stop(struct snd_timer_instance *timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599{
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100600 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
601 return snd_timer_stop_slave(timeri, true);
602 else
603 return snd_timer_stop1(timeri, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604}
605
606/*
607 * start again.. the tick is kept.
608 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100609int snd_timer_continue(struct snd_timer_instance *timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610{
Takashi Iwai9f8a7652016-09-07 15:45:31 +0200611 /* timer can continue only after pause */
612 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
613 return -EINVAL;
614
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100616 return snd_timer_start_slave(timeri, false);
617 else
618 return snd_timer_start1(timeri, false, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619}
620
621/*
622 * pause.. remember the ticks left
623 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100624int snd_timer_pause(struct snd_timer_instance * timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625{
Takashi Iwaif65e0d22016-02-10 12:47:03 +0100626 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
627 return snd_timer_stop_slave(timeri, false);
628 else
629 return snd_timer_stop1(timeri, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630}
631
632/*
633 * reschedule the timer
634 *
635 * start pending instances and check the scheduling ticks.
636 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
637 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100638static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100640 struct snd_timer_instance *ti;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 unsigned long ticks = ~0UL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
Johannes Berg9244b2c2006-10-05 16:02:22 +0200643 list_for_each_entry(ti, &timer->active_list_head, active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 if (ti->flags & SNDRV_TIMER_IFLG_START) {
645 ti->flags &= ~SNDRV_TIMER_IFLG_START;
646 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
647 timer->running++;
648 }
649 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
650 if (ticks > ti->cticks)
651 ticks = ti->cticks;
652 }
653 }
654 if (ticks == ~0UL) {
655 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
656 return;
657 }
658 if (ticks > timer->hw.ticks)
659 ticks = timer->hw.ticks;
660 if (ticks_left != ticks)
661 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
662 timer->sticks = ticks;
663}
664
665/*
666 * timer tasklet
667 *
668 */
669static void snd_timer_tasklet(unsigned long arg)
670{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100671 struct snd_timer *timer = (struct snd_timer *) arg;
672 struct snd_timer_instance *ti;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 struct list_head *p;
674 unsigned long resolution, ticks;
Takashi Iwai2999ff52006-07-05 17:16:58 +0200675 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
Takashi Iwai230323d2016-01-21 17:19:31 +0100677 if (timer->card && timer->card->shutdown)
678 return;
679
Takashi Iwai2999ff52006-07-05 17:16:58 +0200680 spin_lock_irqsave(&timer->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 /* now process all callbacks */
682 while (!list_empty(&timer->sack_list_head)) {
683 p = timer->sack_list_head.next; /* get first item */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100684 ti = list_entry(p, struct snd_timer_instance, ack_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
686 /* remove from ack_list and make empty */
687 list_del_init(p);
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200688
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 ticks = ti->pticks;
690 ti->pticks = 0;
691 resolution = ti->resolution;
692
693 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
694 spin_unlock(&timer->lock);
695 if (ti->callback)
696 ti->callback(ti, resolution, ticks);
697 spin_lock(&timer->lock);
698 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
699 }
Takashi Iwai2999ff52006-07-05 17:16:58 +0200700 spin_unlock_irqrestore(&timer->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701}
702
703/*
704 * timer interrupt
705 *
706 * ticks_left is usually equal to timer->sticks.
707 *
708 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100709void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710{
Johannes Berg9244b2c2006-10-05 16:02:22 +0200711 struct snd_timer_instance *ti, *ts, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 unsigned long resolution, ticks;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200713 struct list_head *p, *ack_list_head;
Takashi Iwaib32425a2005-11-18 18:52:14 +0100714 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 int use_tasklet = 0;
716
717 if (timer == NULL)
718 return;
719
Takashi Iwai230323d2016-01-21 17:19:31 +0100720 if (timer->card && timer->card->shutdown)
721 return;
722
Takashi Iwaib32425a2005-11-18 18:52:14 +0100723 spin_lock_irqsave(&timer->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724
725 /* remember the current resolution */
726 if (timer->hw.c_resolution)
727 resolution = timer->hw.c_resolution(timer);
728 else
729 resolution = timer->hw.resolution;
730
731 /* loop for all active instances
Johannes Berg9244b2c2006-10-05 16:02:22 +0200732 * Here we cannot use list_for_each_entry because the active_list of a
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200733 * processed instance is relinked to done_list_head before the callback
734 * is called.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 */
Johannes Berg9244b2c2006-10-05 16:02:22 +0200736 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
737 active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
739 continue;
740 ti->pticks += ticks_left;
741 ti->resolution = resolution;
742 if (ti->cticks < ticks_left)
743 ti->cticks = 0;
744 else
745 ti->cticks -= ticks_left;
746 if (ti->cticks) /* not expired */
747 continue;
748 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
749 ti->cticks = ti->ticks;
750 } else {
751 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
Takashi Iwai094fd3b2016-02-04 17:06:13 +0100752 --timer->running;
753 list_del_init(&ti->active_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 }
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200755 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
756 (ti->flags & SNDRV_TIMER_IFLG_FAST))
757 ack_list_head = &timer->ack_list_head;
758 else
759 ack_list_head = &timer->sack_list_head;
760 if (list_empty(&ti->ack_list))
761 list_add_tail(&ti->ack_list, ack_list_head);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200762 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 ts->pticks = ti->pticks;
764 ts->resolution = resolution;
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200765 if (list_empty(&ts->ack_list))
766 list_add_tail(&ts->ack_list, ack_list_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 }
768 }
769 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
Clemens Ladischcd93fe42006-07-17 16:53:57 +0200770 snd_timer_reschedule(timer, timer->sticks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 if (timer->running) {
772 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
773 timer->hw.stop(timer);
774 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
775 }
776 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
777 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
778 /* restart timer */
779 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
780 timer->hw.start(timer);
781 }
782 } else {
783 timer->hw.stop(timer);
784 }
785
786 /* now process all fast callbacks */
787 while (!list_empty(&timer->ack_list_head)) {
788 p = timer->ack_list_head.next; /* get first item */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100789 ti = list_entry(p, struct snd_timer_instance, ack_list);
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200790
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 /* remove from ack_list and make empty */
792 list_del_init(p);
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200793
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 ticks = ti->pticks;
795 ti->pticks = 0;
796
797 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
798 spin_unlock(&timer->lock);
799 if (ti->callback)
800 ti->callback(ti, resolution, ticks);
801 spin_lock(&timer->lock);
802 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
803 }
804
805 /* do we have any slow callbacks? */
806 use_tasklet = !list_empty(&timer->sack_list_head);
Takashi Iwaib32425a2005-11-18 18:52:14 +0100807 spin_unlock_irqrestore(&timer->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808
809 if (use_tasklet)
Takashi Iwai1f041282008-12-18 12:17:55 +0100810 tasklet_schedule(&timer->task_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811}
812
813/*
814
815 */
816
Takashi Iwai53d2f742005-11-17 13:56:05 +0100817int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
818 struct snd_timer **rtimer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100820 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 int err;
Takashi Iwai53d2f742005-11-17 13:56:05 +0100822 static struct snd_device_ops ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 .dev_free = snd_timer_dev_free,
824 .dev_register = snd_timer_dev_register,
Takashi Iwaic4614822006-06-23 14:38:23 +0200825 .dev_disconnect = snd_timer_dev_disconnect,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 };
827
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200828 if (snd_BUG_ON(!tid))
829 return -EINVAL;
830 if (rtimer)
831 *rtimer = NULL;
Takashi Iwaica2c0962005-09-09 14:20:23 +0200832 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
Takashi Iwaiec0e9932015-03-10 15:42:14 +0100833 if (!timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 return -ENOMEM;
835 timer->tmr_class = tid->dev_class;
836 timer->card = card;
837 timer->tmr_device = tid->device;
838 timer->tmr_subdevice = tid->subdevice;
839 if (id)
840 strlcpy(timer->id, id, sizeof(timer->id));
Vegard Nossum6b760bb2016-08-29 00:33:50 +0200841 timer->sticks = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 INIT_LIST_HEAD(&timer->device_list);
843 INIT_LIST_HEAD(&timer->open_list_head);
844 INIT_LIST_HEAD(&timer->active_list_head);
845 INIT_LIST_HEAD(&timer->ack_list_head);
846 INIT_LIST_HEAD(&timer->sack_list_head);
847 spin_lock_init(&timer->lock);
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200848 tasklet_init(&timer->task_queue, snd_timer_tasklet,
849 (unsigned long)timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 if (card != NULL) {
Clemens Ladischde242142005-10-12 17:12:31 +0200851 timer->module = card->module;
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200852 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
853 if (err < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 snd_timer_free(timer);
855 return err;
856 }
857 }
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200858 if (rtimer)
859 *rtimer = timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 return 0;
861}
862
Takashi Iwai53d2f742005-11-17 13:56:05 +0100863static int snd_timer_free(struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864{
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200865 if (!timer)
866 return 0;
Takashi Iwaic4614822006-06-23 14:38:23 +0200867
868 mutex_lock(&register_mutex);
869 if (! list_empty(&timer->open_list_head)) {
870 struct list_head *p, *n;
871 struct snd_timer_instance *ti;
Takashi Iwaicf74dcf2014-02-04 18:22:39 +0100872 pr_warn("ALSA: timer %p is busy?\n", timer);
Takashi Iwaic4614822006-06-23 14:38:23 +0200873 list_for_each_safe(p, n, &timer->open_list_head) {
874 list_del_init(p);
875 ti = list_entry(p, struct snd_timer_instance, open_list);
876 ti->timer = NULL;
877 }
878 }
879 list_del(&timer->device_list);
880 mutex_unlock(&register_mutex);
881
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 if (timer->private_free)
883 timer->private_free(timer);
884 kfree(timer);
885 return 0;
886}
887
Takashi Iwai53d2f742005-11-17 13:56:05 +0100888static int snd_timer_dev_free(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100890 struct snd_timer *timer = device->device_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 return snd_timer_free(timer);
892}
893
Takashi Iwai53d2f742005-11-17 13:56:05 +0100894static int snd_timer_dev_register(struct snd_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100896 struct snd_timer *timer = dev->device_data;
897 struct snd_timer *timer1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200899 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
900 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
902 !timer->hw.resolution && timer->hw.c_resolution == NULL)
903 return -EINVAL;
904
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100905 mutex_lock(&register_mutex);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200906 list_for_each_entry(timer1, &snd_timer_list, device_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 if (timer1->tmr_class > timer->tmr_class)
908 break;
909 if (timer1->tmr_class < timer->tmr_class)
910 continue;
911 if (timer1->card && timer->card) {
912 if (timer1->card->number > timer->card->number)
913 break;
914 if (timer1->card->number < timer->card->number)
915 continue;
916 }
917 if (timer1->tmr_device > timer->tmr_device)
918 break;
919 if (timer1->tmr_device < timer->tmr_device)
920 continue;
921 if (timer1->tmr_subdevice > timer->tmr_subdevice)
922 break;
923 if (timer1->tmr_subdevice < timer->tmr_subdevice)
924 continue;
925 /* conflicts.. */
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100926 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 return -EBUSY;
928 }
Johannes Berg9244b2c2006-10-05 16:02:22 +0200929 list_add_tail(&timer->device_list, &timer1->device_list);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100930 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 return 0;
932}
933
Takashi Iwaic4614822006-06-23 14:38:23 +0200934static int snd_timer_dev_disconnect(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100936 struct snd_timer *timer = device->device_data;
Takashi Iwai230323d2016-01-21 17:19:31 +0100937 struct snd_timer_instance *ti;
938
Takashi Iwaic4614822006-06-23 14:38:23 +0200939 mutex_lock(&register_mutex);
940 list_del_init(&timer->device_list);
Takashi Iwai230323d2016-01-21 17:19:31 +0100941 /* wake up pending sleepers */
942 list_for_each_entry(ti, &timer->open_list_head, open_list) {
Takashi Iwai40ed9442016-01-21 17:43:08 +0100943 if (ti->disconnect)
944 ti->disconnect(ti);
Takashi Iwai230323d2016-01-21 17:19:31 +0100945 }
Takashi Iwaic4614822006-06-23 14:38:23 +0200946 mutex_unlock(&register_mutex);
947 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948}
949
Takashi Iwai53d2f742005-11-17 13:56:05 +0100950void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951{
952 unsigned long flags;
953 unsigned long resolution = 0;
Takashi Iwai53d2f742005-11-17 13:56:05 +0100954 struct snd_timer_instance *ti, *ts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
Takashi Iwai230323d2016-01-21 17:19:31 +0100956 if (timer->card && timer->card->shutdown)
957 return;
Takashi Iwai7c22f1a2005-10-10 11:46:31 +0200958 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
959 return;
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200960 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
961 event > SNDRV_TIMER_EVENT_MRESUME))
962 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 spin_lock_irqsave(&timer->lock, flags);
Jaroslav Kyselaa501dfa2005-08-16 11:09:05 +0200964 if (event == SNDRV_TIMER_EVENT_MSTART ||
965 event == SNDRV_TIMER_EVENT_MCONTINUE ||
966 event == SNDRV_TIMER_EVENT_MRESUME) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 if (timer->hw.c_resolution)
968 resolution = timer->hw.c_resolution(timer);
969 else
970 resolution = timer->hw.resolution;
971 }
Johannes Berg9244b2c2006-10-05 16:02:22 +0200972 list_for_each_entry(ti, &timer->active_list_head, active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 if (ti->ccallback)
974 ti->ccallback(ti, event, tstamp, resolution);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200975 list_for_each_entry(ts, &ti->slave_active_head, active_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 if (ts->ccallback)
977 ts->ccallback(ts, event, tstamp, resolution);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 }
979 spin_unlock_irqrestore(&timer->lock, flags);
980}
981
982/*
983 * exported functions for global timers
984 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100985int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100987 struct snd_timer_id tid;
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200988
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
990 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
991 tid.card = -1;
992 tid.device = device;
993 tid.subdevice = 0;
994 return snd_timer_new(NULL, id, &tid, rtimer);
995}
996
Takashi Iwai53d2f742005-11-17 13:56:05 +0100997int snd_timer_global_free(struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998{
999 return snd_timer_free(timer);
1000}
1001
Takashi Iwai53d2f742005-11-17 13:56:05 +01001002int snd_timer_global_register(struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001004 struct snd_device dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005
1006 memset(&dev, 0, sizeof(dev));
1007 dev.device_data = timer;
1008 return snd_timer_dev_register(&dev);
1009}
1010
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001011/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 * System timer
1013 */
1014
1015struct snd_timer_system_private {
1016 struct timer_list tlist;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 unsigned long last_expires;
1018 unsigned long last_jiffies;
1019 unsigned long correction;
1020};
1021
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022static void snd_timer_s_function(unsigned long data)
1023{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001024 struct snd_timer *timer = (struct snd_timer *)data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 struct snd_timer_system_private *priv = timer->private_data;
1026 unsigned long jiff = jiffies;
1027 if (time_after(jiff, priv->last_expires))
Clemens Ladisch6ed5eff2006-07-17 16:51:37 +02001028 priv->correction += (long)jiff - (long)priv->last_expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
1030}
1031
Takashi Iwai53d2f742005-11-17 13:56:05 +01001032static int snd_timer_s_start(struct snd_timer * timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033{
1034 struct snd_timer_system_private *priv;
1035 unsigned long njiff;
1036
1037 priv = (struct snd_timer_system_private *) timer->private_data;
1038 njiff = (priv->last_jiffies = jiffies);
1039 if (priv->correction > timer->sticks - 1) {
1040 priv->correction -= timer->sticks - 1;
1041 njiff++;
1042 } else {
1043 njiff += timer->sticks - priv->correction;
Clemens Ladisch17f48ec2006-07-17 16:50:56 +02001044 priv->correction = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 }
Takashi Iwai4a070832016-04-01 12:28:16 +02001046 priv->last_expires = njiff;
1047 mod_timer(&priv->tlist, njiff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 return 0;
1049}
1050
Takashi Iwai53d2f742005-11-17 13:56:05 +01001051static int snd_timer_s_stop(struct snd_timer * timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052{
1053 struct snd_timer_system_private *priv;
1054 unsigned long jiff;
1055
1056 priv = (struct snd_timer_system_private *) timer->private_data;
1057 del_timer(&priv->tlist);
1058 jiff = jiffies;
1059 if (time_before(jiff, priv->last_expires))
1060 timer->sticks = priv->last_expires - jiff;
1061 else
1062 timer->sticks = 1;
Clemens Ladischde2696d2006-07-17 16:52:09 +02001063 priv->correction = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 return 0;
1065}
1066
Takashi Iwaif1463572016-02-02 14:14:10 +01001067static int snd_timer_s_close(struct snd_timer *timer)
1068{
1069 struct snd_timer_system_private *priv;
1070
1071 priv = (struct snd_timer_system_private *)timer->private_data;
1072 del_timer_sync(&priv->tlist);
1073 return 0;
1074}
1075
Takashi Iwai53d2f742005-11-17 13:56:05 +01001076static struct snd_timer_hardware snd_timer_system =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077{
1078 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1079 .resolution = 1000000000L / HZ,
1080 .ticks = 10000000L,
Takashi Iwaif1463572016-02-02 14:14:10 +01001081 .close = snd_timer_s_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 .start = snd_timer_s_start,
1083 .stop = snd_timer_s_stop
1084};
1085
Takashi Iwai53d2f742005-11-17 13:56:05 +01001086static void snd_timer_free_system(struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087{
1088 kfree(timer->private_data);
1089}
1090
1091static int snd_timer_register_system(void)
1092{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001093 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 struct snd_timer_system_private *priv;
1095 int err;
1096
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001097 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1098 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 return err;
1100 strcpy(timer->name, "system timer");
1101 timer->hw = snd_timer_system;
Takashi Iwaica2c0962005-09-09 14:20:23 +02001102 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 if (priv == NULL) {
1104 snd_timer_free(timer);
1105 return -ENOMEM;
1106 }
Takashi Iwaif169c102015-01-19 11:26:25 +01001107 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 timer->private_data = priv;
1109 timer->private_free = snd_timer_free_system;
1110 return snd_timer_global_register(timer);
1111}
1112
Jie Yangcd6a6502015-05-27 19:45:45 +08001113#ifdef CONFIG_SND_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114/*
1115 * Info interface
1116 */
1117
Takashi Iwai53d2f742005-11-17 13:56:05 +01001118static void snd_timer_proc_read(struct snd_info_entry *entry,
1119 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001121 struct snd_timer *timer;
1122 struct snd_timer_instance *ti;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001124 mutex_lock(&register_mutex);
Johannes Berg9244b2c2006-10-05 16:02:22 +02001125 list_for_each_entry(timer, &snd_timer_list, device_list) {
Takashi Iwai230323d2016-01-21 17:19:31 +01001126 if (timer->card && timer->card->shutdown)
1127 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 switch (timer->tmr_class) {
1129 case SNDRV_TIMER_CLASS_GLOBAL:
1130 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1131 break;
1132 case SNDRV_TIMER_CLASS_CARD:
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001133 snd_iprintf(buffer, "C%i-%i: ",
1134 timer->card->number, timer->tmr_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 break;
1136 case SNDRV_TIMER_CLASS_PCM:
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001137 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1138 timer->tmr_device, timer->tmr_subdevice);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 break;
1140 default:
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001141 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1142 timer->card ? timer->card->number : -1,
1143 timer->tmr_device, timer->tmr_subdevice);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 }
1145 snd_iprintf(buffer, "%s :", timer->name);
1146 if (timer->hw.resolution)
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001147 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1148 timer->hw.resolution / 1000,
1149 timer->hw.resolution % 1000,
1150 timer->hw.ticks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1152 snd_iprintf(buffer, " SLAVE");
1153 snd_iprintf(buffer, "\n");
Johannes Berg9244b2c2006-10-05 16:02:22 +02001154 list_for_each_entry(ti, &timer->open_list_head, open_list)
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001155 snd_iprintf(buffer, " Client %s : %s\n",
1156 ti->owner ? ti->owner : "unknown",
1157 ti->flags & (SNDRV_TIMER_IFLG_START |
1158 SNDRV_TIMER_IFLG_RUNNING)
1159 ? "running" : "stopped");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001161 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162}
1163
Takashi Iwai6581f4e2006-05-17 17:14:51 +02001164static struct snd_info_entry *snd_timer_proc_entry;
Takashi Iwaie28563c2005-12-01 10:42:42 +01001165
1166static void __init snd_timer_proc_init(void)
1167{
1168 struct snd_info_entry *entry;
1169
1170 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1171 if (entry != NULL) {
Takashi Iwaie28563c2005-12-01 10:42:42 +01001172 entry->c.text.read = snd_timer_proc_read;
1173 if (snd_info_register(entry) < 0) {
1174 snd_info_free_entry(entry);
1175 entry = NULL;
1176 }
1177 }
1178 snd_timer_proc_entry = entry;
1179}
1180
1181static void __exit snd_timer_proc_done(void)
1182{
Takashi Iwai746d4a02006-06-23 14:37:59 +02001183 snd_info_free_entry(snd_timer_proc_entry);
Takashi Iwaie28563c2005-12-01 10:42:42 +01001184}
Jie Yangcd6a6502015-05-27 19:45:45 +08001185#else /* !CONFIG_SND_PROC_FS */
Takashi Iwaie28563c2005-12-01 10:42:42 +01001186#define snd_timer_proc_init()
1187#define snd_timer_proc_done()
1188#endif
1189
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190/*
1191 * USER SPACE interface
1192 */
1193
Takashi Iwai53d2f742005-11-17 13:56:05 +01001194static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 unsigned long resolution,
1196 unsigned long ticks)
1197{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001198 struct snd_timer_user *tu = timeri->callback_data;
1199 struct snd_timer_read *r;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 int prev;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001201
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 spin_lock(&tu->qlock);
1203 if (tu->qused > 0) {
1204 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1205 r = &tu->queue[prev];
1206 if (r->resolution == resolution) {
1207 r->ticks += ticks;
1208 goto __wake;
1209 }
1210 }
1211 if (tu->qused >= tu->queue_size) {
1212 tu->overrun++;
1213 } else {
1214 r = &tu->queue[tu->qtail++];
1215 tu->qtail %= tu->queue_size;
1216 r->resolution = resolution;
1217 r->ticks = ticks;
1218 tu->qused++;
1219 }
1220 __wake:
1221 spin_unlock(&tu->qlock);
1222 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1223 wake_up(&tu->qchange_sleep);
1224}
1225
Takashi Iwai53d2f742005-11-17 13:56:05 +01001226static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1227 struct snd_timer_tread *tread)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228{
1229 if (tu->qused >= tu->queue_size) {
1230 tu->overrun++;
1231 } else {
1232 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1233 tu->qtail %= tu->queue_size;
1234 tu->qused++;
1235 }
1236}
1237
Takashi Iwai53d2f742005-11-17 13:56:05 +01001238static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1239 int event,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 struct timespec *tstamp,
1241 unsigned long resolution)
1242{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001243 struct snd_timer_user *tu = timeri->callback_data;
1244 struct snd_timer_tread r1;
Dan Carpenterbfe70782010-04-28 10:29:14 +02001245 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001247 if (event >= SNDRV_TIMER_EVENT_START &&
1248 event <= SNDRV_TIMER_EVENT_PAUSE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 tu->tstamp = *tstamp;
1250 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1251 return;
Kangjie Lu9a47e9c2016-05-03 16:44:20 -04001252 memset(&r1, 0, sizeof(r1));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 r1.event = event;
1254 r1.tstamp = *tstamp;
1255 r1.val = resolution;
Dan Carpenterbfe70782010-04-28 10:29:14 +02001256 spin_lock_irqsave(&tu->qlock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257 snd_timer_user_append_to_tqueue(tu, &r1);
Dan Carpenterbfe70782010-04-28 10:29:14 +02001258 spin_unlock_irqrestore(&tu->qlock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1260 wake_up(&tu->qchange_sleep);
1261}
1262
Takashi Iwai40ed9442016-01-21 17:43:08 +01001263static void snd_timer_user_disconnect(struct snd_timer_instance *timeri)
1264{
1265 struct snd_timer_user *tu = timeri->callback_data;
1266
1267 tu->disconnected = true;
1268 wake_up(&tu->qchange_sleep);
1269}
1270
Takashi Iwai53d2f742005-11-17 13:56:05 +01001271static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 unsigned long resolution,
1273 unsigned long ticks)
1274{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001275 struct snd_timer_user *tu = timeri->callback_data;
1276 struct snd_timer_tread *r, r1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 struct timespec tstamp;
1278 int prev, append = 0;
1279
Takashi Iwai07799e72005-10-10 11:49:49 +02001280 memset(&tstamp, 0, sizeof(tstamp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 spin_lock(&tu->qlock);
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001282 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1283 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 spin_unlock(&tu->qlock);
1285 return;
1286 }
Jaroslav Kyselab751eef2007-12-13 10:19:42 +01001287 if (tu->last_resolution != resolution || ticks > 0) {
1288 if (timer_tstamp_monotonic)
Thomas Gleixner26204e02014-06-11 23:59:14 +00001289 ktime_get_ts(&tstamp);
Jaroslav Kyselab751eef2007-12-13 10:19:42 +01001290 else
1291 getnstimeofday(&tstamp);
1292 }
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001293 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1294 tu->last_resolution != resolution) {
Kangjie Lue4ec8cc2016-05-03 16:44:32 -04001295 memset(&r1, 0, sizeof(r1));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1297 r1.tstamp = tstamp;
1298 r1.val = resolution;
1299 snd_timer_user_append_to_tqueue(tu, &r1);
1300 tu->last_resolution = resolution;
1301 append++;
1302 }
1303 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1304 goto __wake;
1305 if (ticks == 0)
1306 goto __wake;
1307 if (tu->qused > 0) {
1308 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1309 r = &tu->tqueue[prev];
1310 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1311 r->tstamp = tstamp;
1312 r->val += ticks;
1313 append++;
1314 goto __wake;
1315 }
1316 }
1317 r1.event = SNDRV_TIMER_EVENT_TICK;
1318 r1.tstamp = tstamp;
1319 r1.val = ticks;
1320 snd_timer_user_append_to_tqueue(tu, &r1);
1321 append++;
1322 __wake:
1323 spin_unlock(&tu->qlock);
1324 if (append == 0)
1325 return;
1326 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1327 wake_up(&tu->qchange_sleep);
1328}
1329
1330static int snd_timer_user_open(struct inode *inode, struct file *file)
1331{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001332 struct snd_timer_user *tu;
Takashi Iwai02f48652010-04-13 11:49:04 +02001333 int err;
1334
1335 err = nonseekable_open(inode, file);
1336 if (err < 0)
1337 return err;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001338
Takashi Iwaica2c0962005-09-09 14:20:23 +02001339 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 if (tu == NULL)
1341 return -ENOMEM;
1342 spin_lock_init(&tu->qlock);
1343 init_waitqueue_head(&tu->qchange_sleep);
Takashi Iwaiaf368022016-01-13 17:48:01 +01001344 mutex_init(&tu->ioctl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 tu->ticks = 1;
1346 tu->queue_size = 128;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001347 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001348 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 if (tu->queue == NULL) {
1350 kfree(tu);
1351 return -ENOMEM;
1352 }
1353 file->private_data = tu;
1354 return 0;
1355}
1356
1357static int snd_timer_user_release(struct inode *inode, struct file *file)
1358{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001359 struct snd_timer_user *tu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360
1361 if (file->private_data) {
1362 tu = file->private_data;
1363 file->private_data = NULL;
Takashi Iwaiaf368022016-01-13 17:48:01 +01001364 mutex_lock(&tu->ioctl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 if (tu->timeri)
1366 snd_timer_close(tu->timeri);
Takashi Iwaiaf368022016-01-13 17:48:01 +01001367 mutex_unlock(&tu->ioctl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 kfree(tu->queue);
1369 kfree(tu->tqueue);
1370 kfree(tu);
1371 }
1372 return 0;
1373}
1374
Takashi Iwai53d2f742005-11-17 13:56:05 +01001375static void snd_timer_user_zero_id(struct snd_timer_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376{
1377 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1378 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1379 id->card = -1;
1380 id->device = -1;
1381 id->subdevice = -1;
1382}
1383
Takashi Iwai53d2f742005-11-17 13:56:05 +01001384static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385{
1386 id->dev_class = timer->tmr_class;
1387 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1388 id->card = timer->card ? timer->card->number : -1;
1389 id->device = timer->tmr_device;
1390 id->subdevice = timer->tmr_subdevice;
1391}
1392
Takashi Iwai53d2f742005-11-17 13:56:05 +01001393static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001395 struct snd_timer_id id;
1396 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 struct list_head *p;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001398
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 if (copy_from_user(&id, _tid, sizeof(id)))
1400 return -EFAULT;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001401 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 if (id.dev_class < 0) { /* first item */
1403 if (list_empty(&snd_timer_list))
1404 snd_timer_user_zero_id(&id);
1405 else {
Clemens Ladisch9dfba382005-10-12 17:14:55 +02001406 timer = list_entry(snd_timer_list.next,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001407 struct snd_timer, device_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 snd_timer_user_copy_id(&id, timer);
1409 }
1410 } else {
1411 switch (id.dev_class) {
1412 case SNDRV_TIMER_CLASS_GLOBAL:
1413 id.device = id.device < 0 ? 0 : id.device + 1;
1414 list_for_each(p, &snd_timer_list) {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001415 timer = list_entry(p, struct snd_timer, device_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1417 snd_timer_user_copy_id(&id, timer);
1418 break;
1419 }
1420 if (timer->tmr_device >= id.device) {
1421 snd_timer_user_copy_id(&id, timer);
1422 break;
1423 }
1424 }
1425 if (p == &snd_timer_list)
1426 snd_timer_user_zero_id(&id);
1427 break;
1428 case SNDRV_TIMER_CLASS_CARD:
1429 case SNDRV_TIMER_CLASS_PCM:
1430 if (id.card < 0) {
1431 id.card = 0;
1432 } else {
1433 if (id.card < 0) {
1434 id.card = 0;
1435 } else {
1436 if (id.device < 0) {
1437 id.device = 0;
1438 } else {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001439 if (id.subdevice < 0) {
1440 id.subdevice = 0;
1441 } else {
1442 id.subdevice++;
1443 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 }
1445 }
1446 }
1447 list_for_each(p, &snd_timer_list) {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001448 timer = list_entry(p, struct snd_timer, device_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449 if (timer->tmr_class > id.dev_class) {
1450 snd_timer_user_copy_id(&id, timer);
1451 break;
1452 }
1453 if (timer->tmr_class < id.dev_class)
1454 continue;
1455 if (timer->card->number > id.card) {
1456 snd_timer_user_copy_id(&id, timer);
1457 break;
1458 }
1459 if (timer->card->number < id.card)
1460 continue;
1461 if (timer->tmr_device > id.device) {
1462 snd_timer_user_copy_id(&id, timer);
1463 break;
1464 }
1465 if (timer->tmr_device < id.device)
1466 continue;
1467 if (timer->tmr_subdevice > id.subdevice) {
1468 snd_timer_user_copy_id(&id, timer);
1469 break;
1470 }
1471 if (timer->tmr_subdevice < id.subdevice)
1472 continue;
1473 snd_timer_user_copy_id(&id, timer);
1474 break;
1475 }
1476 if (p == &snd_timer_list)
1477 snd_timer_user_zero_id(&id);
1478 break;
1479 default:
1480 snd_timer_user_zero_id(&id);
1481 }
1482 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001483 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1485 return -EFAULT;
1486 return 0;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001487}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001489static int snd_timer_user_ginfo(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001490 struct snd_timer_ginfo __user *_ginfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001492 struct snd_timer_ginfo *ginfo;
1493 struct snd_timer_id tid;
1494 struct snd_timer *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495 struct list_head *p;
1496 int err = 0;
1497
Li Zefanef44a1e2009-04-10 09:43:08 +08001498 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1499 if (IS_ERR(ginfo))
1500 return PTR_ERR(ginfo);
1501
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 tid = ginfo->tid;
1503 memset(ginfo, 0, sizeof(*ginfo));
1504 ginfo->tid = tid;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001505 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506 t = snd_timer_find(&tid);
1507 if (t != NULL) {
1508 ginfo->card = t->card ? t->card->number : -1;
1509 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1510 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1511 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1512 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1513 ginfo->resolution = t->hw.resolution;
1514 if (t->hw.resolution_min > 0) {
1515 ginfo->resolution_min = t->hw.resolution_min;
1516 ginfo->resolution_max = t->hw.resolution_max;
1517 }
1518 list_for_each(p, &t->open_list_head) {
1519 ginfo->clients++;
1520 }
1521 } else {
1522 err = -ENODEV;
1523 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001524 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1526 err = -EFAULT;
1527 kfree(ginfo);
1528 return err;
1529}
1530
Takashi Sakamoto91d21782016-03-23 08:03:59 +09001531static int timer_set_gparams(struct snd_timer_gparams *gparams)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001533 struct snd_timer *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 int err;
1535
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001536 mutex_lock(&register_mutex);
Takashi Sakamoto91d21782016-03-23 08:03:59 +09001537 t = snd_timer_find(&gparams->tid);
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001538 if (!t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 err = -ENODEV;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001540 goto _error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 }
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001542 if (!list_empty(&t->open_list_head)) {
1543 err = -EBUSY;
1544 goto _error;
1545 }
1546 if (!t->hw.set_period) {
1547 err = -ENOSYS;
1548 goto _error;
1549 }
Takashi Sakamoto91d21782016-03-23 08:03:59 +09001550 err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001551_error:
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001552 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553 return err;
1554}
1555
Takashi Sakamoto91d21782016-03-23 08:03:59 +09001556static int snd_timer_user_gparams(struct file *file,
1557 struct snd_timer_gparams __user *_gparams)
1558{
1559 struct snd_timer_gparams gparams;
1560
1561 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1562 return -EFAULT;
1563 return timer_set_gparams(&gparams);
1564}
1565
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001566static int snd_timer_user_gstatus(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001567 struct snd_timer_gstatus __user *_gstatus)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001569 struct snd_timer_gstatus gstatus;
1570 struct snd_timer_id tid;
1571 struct snd_timer *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572 int err = 0;
1573
1574 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1575 return -EFAULT;
1576 tid = gstatus.tid;
1577 memset(&gstatus, 0, sizeof(gstatus));
1578 gstatus.tid = tid;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001579 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580 t = snd_timer_find(&tid);
1581 if (t != NULL) {
1582 if (t->hw.c_resolution)
1583 gstatus.resolution = t->hw.c_resolution(t);
1584 else
1585 gstatus.resolution = t->hw.resolution;
1586 if (t->hw.precise_resolution) {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001587 t->hw.precise_resolution(t, &gstatus.resolution_num,
1588 &gstatus.resolution_den);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589 } else {
1590 gstatus.resolution_num = gstatus.resolution;
1591 gstatus.resolution_den = 1000000000uL;
1592 }
1593 } else {
1594 err = -ENODEV;
1595 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001596 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1598 err = -EFAULT;
1599 return err;
1600}
1601
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001602static int snd_timer_user_tselect(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001603 struct snd_timer_select __user *_tselect)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001605 struct snd_timer_user *tu;
1606 struct snd_timer_select tselect;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607 char str[32];
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001608 int err = 0;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001609
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 tu = file->private_data;
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001611 if (tu->timeri) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612 snd_timer_close(tu->timeri);
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001613 tu->timeri = NULL;
1614 }
1615 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1616 err = -EFAULT;
1617 goto __err;
1618 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619 sprintf(str, "application %i", current->pid);
1620 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1621 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001622 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1623 if (err < 0)
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001624 goto __err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625
Jesper Juhl4d572772005-05-30 17:30:32 +02001626 kfree(tu->queue);
1627 tu->queue = NULL;
1628 kfree(tu->tqueue);
1629 tu->tqueue = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 if (tu->tread) {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001631 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001632 GFP_KERNEL);
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001633 if (tu->tqueue == NULL)
1634 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635 } else {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001636 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001637 GFP_KERNEL);
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001638 if (tu->queue == NULL)
1639 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640 }
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001641
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001642 if (err < 0) {
1643 snd_timer_close(tu->timeri);
1644 tu->timeri = NULL;
1645 } else {
1646 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001647 tu->timeri->callback = tu->tread
1648 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001649 tu->timeri->ccallback = snd_timer_user_ccallback;
1650 tu->timeri->callback_data = (void *)tu;
Takashi Iwai40ed9442016-01-21 17:43:08 +01001651 tu->timeri->disconnect = snd_timer_user_disconnect;
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001652 }
1653
1654 __err:
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001655 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656}
1657
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001658static int snd_timer_user_info(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001659 struct snd_timer_info __user *_info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001661 struct snd_timer_user *tu;
1662 struct snd_timer_info *info;
1663 struct snd_timer *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664 int err = 0;
1665
1666 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001667 if (!tu->timeri)
1668 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 t = tu->timeri->timer;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001670 if (!t)
1671 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672
Takashi Iwaica2c0962005-09-09 14:20:23 +02001673 info = kzalloc(sizeof(*info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 if (! info)
1675 return -ENOMEM;
1676 info->card = t->card ? t->card->number : -1;
1677 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1678 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1679 strlcpy(info->id, t->id, sizeof(info->id));
1680 strlcpy(info->name, t->name, sizeof(info->name));
1681 info->resolution = t->hw.resolution;
1682 if (copy_to_user(_info, info, sizeof(*_info)))
1683 err = -EFAULT;
1684 kfree(info);
1685 return err;
1686}
1687
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001688static int snd_timer_user_params(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001689 struct snd_timer_params __user *_params)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001691 struct snd_timer_user *tu;
1692 struct snd_timer_params params;
1693 struct snd_timer *t;
1694 struct snd_timer_read *tr;
1695 struct snd_timer_tread *ttr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696 int err;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001697
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001699 if (!tu->timeri)
1700 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 t = tu->timeri->timer;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001702 if (!t)
1703 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704 if (copy_from_user(&params, _params, sizeof(params)))
1705 return -EFAULT;
Takashi Iwai71321eb2017-02-28 14:49:07 +01001706 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
1707 u64 resolution;
1708
1709 if (params.ticks < 1) {
1710 err = -EINVAL;
1711 goto _end;
1712 }
1713
1714 /* Don't allow resolution less than 1ms */
1715 resolution = snd_timer_resolution(tu->timeri);
1716 resolution *= params.ticks;
1717 if (resolution < 1000000) {
1718 err = -EINVAL;
1719 goto _end;
1720 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721 }
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001722 if (params.queue_size > 0 &&
1723 (params.queue_size < 32 || params.queue_size > 1024)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724 err = -EINVAL;
1725 goto _end;
1726 }
1727 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1728 (1<<SNDRV_TIMER_EVENT_TICK)|
1729 (1<<SNDRV_TIMER_EVENT_START)|
1730 (1<<SNDRV_TIMER_EVENT_STOP)|
1731 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1732 (1<<SNDRV_TIMER_EVENT_PAUSE)|
Jaroslav Kyselaa501dfa2005-08-16 11:09:05 +02001733 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1734 (1<<SNDRV_TIMER_EVENT_RESUME)|
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735 (1<<SNDRV_TIMER_EVENT_MSTART)|
1736 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1737 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
Jaroslav Kysela65d11d92005-08-16 13:05:43 +02001738 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1739 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
Jaroslav Kyselaa501dfa2005-08-16 11:09:05 +02001740 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741 err = -EINVAL;
1742 goto _end;
1743 }
1744 snd_timer_stop(tu->timeri);
1745 spin_lock_irq(&t->lock);
1746 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1747 SNDRV_TIMER_IFLG_EXCLUSIVE|
1748 SNDRV_TIMER_IFLG_EARLY_EVENT);
1749 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1750 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1751 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1752 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1753 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1754 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1755 spin_unlock_irq(&t->lock);
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001756 if (params.queue_size > 0 &&
1757 (unsigned int)tu->queue_size != params.queue_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758 if (tu->tread) {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001759 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1760 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761 if (ttr) {
1762 kfree(tu->tqueue);
1763 tu->queue_size = params.queue_size;
1764 tu->tqueue = ttr;
1765 }
1766 } else {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001767 tr = kmalloc(params.queue_size * sizeof(*tr),
1768 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769 if (tr) {
1770 kfree(tu->queue);
1771 tu->queue_size = params.queue_size;
1772 tu->queue = tr;
1773 }
1774 }
1775 }
1776 tu->qhead = tu->qtail = tu->qused = 0;
1777 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1778 if (tu->tread) {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001779 struct snd_timer_tread tread;
Kangjie Lucec8f962016-05-03 16:44:07 -04001780 memset(&tread, 0, sizeof(tread));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781 tread.event = SNDRV_TIMER_EVENT_EARLY;
1782 tread.tstamp.tv_sec = 0;
1783 tread.tstamp.tv_nsec = 0;
1784 tread.val = 0;
1785 snd_timer_user_append_to_tqueue(tu, &tread);
1786 } else {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001787 struct snd_timer_read *r = &tu->queue[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788 r->resolution = 0;
1789 r->ticks = 0;
1790 tu->qused++;
1791 tu->qtail++;
1792 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793 }
1794 tu->filter = params.filter;
1795 tu->ticks = params.ticks;
1796 err = 0;
1797 _end:
1798 if (copy_to_user(_params, &params, sizeof(params)))
1799 return -EFAULT;
1800 return err;
1801}
1802
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001803static int snd_timer_user_status(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001804 struct snd_timer_status __user *_status)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001806 struct snd_timer_user *tu;
1807 struct snd_timer_status status;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001808
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001810 if (!tu->timeri)
1811 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812 memset(&status, 0, sizeof(status));
1813 status.tstamp = tu->tstamp;
1814 status.resolution = snd_timer_resolution(tu->timeri);
1815 status.lost = tu->timeri->lost;
1816 status.overrun = tu->overrun;
1817 spin_lock_irq(&tu->qlock);
1818 status.queue = tu->qused;
1819 spin_unlock_irq(&tu->qlock);
1820 if (copy_to_user(_status, &status, sizeof(status)))
1821 return -EFAULT;
1822 return 0;
1823}
1824
1825static int snd_timer_user_start(struct file *file)
1826{
1827 int err;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001828 struct snd_timer_user *tu;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001829
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001831 if (!tu->timeri)
1832 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 snd_timer_stop(tu->timeri);
1834 tu->timeri->lost = 0;
1835 tu->last_resolution = 0;
1836 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1837}
1838
1839static int snd_timer_user_stop(struct file *file)
1840{
1841 int err;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001842 struct snd_timer_user *tu;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001843
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001845 if (!tu->timeri)
1846 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1848}
1849
1850static int snd_timer_user_continue(struct file *file)
1851{
1852 int err;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001853 struct snd_timer_user *tu;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001854
Linus Torvalds1da177e2005-04-16 15:20:36 -07001855 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001856 if (!tu->timeri)
1857 return -EBADFD;
Takashi Iwai9f8a7652016-09-07 15:45:31 +02001858 /* start timer instead of continue if it's not used before */
1859 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED))
1860 return snd_timer_user_start(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861 tu->timeri->lost = 0;
1862 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1863}
1864
Takashi Iwai15790a62005-05-15 15:04:14 +02001865static int snd_timer_user_pause(struct file *file)
1866{
1867 int err;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001868 struct snd_timer_user *tu;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001869
Takashi Iwai15790a62005-05-15 15:04:14 +02001870 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001871 if (!tu->timeri)
1872 return -EBADFD;
Jaroslav Kyselad138b442005-05-16 13:51:39 +02001873 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
Takashi Iwai15790a62005-05-15 15:04:14 +02001874}
1875
Takashi Iwai8c50b372005-05-15 15:43:54 +02001876enum {
1877 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1878 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1879 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1880 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1881};
1882
Takashi Iwaiaf368022016-01-13 17:48:01 +01001883static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001884 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001886 struct snd_timer_user *tu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 void __user *argp = (void __user *)arg;
1888 int __user *p = argp;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001889
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890 tu = file->private_data;
1891 switch (cmd) {
1892 case SNDRV_TIMER_IOCTL_PVERSION:
1893 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1894 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1895 return snd_timer_user_next_device(argp);
1896 case SNDRV_TIMER_IOCTL_TREAD:
1897 {
1898 int xarg;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001899
Takashi Iwaiaf368022016-01-13 17:48:01 +01001900 if (tu->timeri) /* too late */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901 return -EBUSY;
Takashi Iwaiaf368022016-01-13 17:48:01 +01001902 if (get_user(xarg, p))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001903 return -EFAULT;
1904 tu->tread = xarg ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 return 0;
1906 }
1907 case SNDRV_TIMER_IOCTL_GINFO:
1908 return snd_timer_user_ginfo(file, argp);
1909 case SNDRV_TIMER_IOCTL_GPARAMS:
1910 return snd_timer_user_gparams(file, argp);
1911 case SNDRV_TIMER_IOCTL_GSTATUS:
1912 return snd_timer_user_gstatus(file, argp);
1913 case SNDRV_TIMER_IOCTL_SELECT:
1914 return snd_timer_user_tselect(file, argp);
1915 case SNDRV_TIMER_IOCTL_INFO:
1916 return snd_timer_user_info(file, argp);
1917 case SNDRV_TIMER_IOCTL_PARAMS:
1918 return snd_timer_user_params(file, argp);
1919 case SNDRV_TIMER_IOCTL_STATUS:
1920 return snd_timer_user_status(file, argp);
1921 case SNDRV_TIMER_IOCTL_START:
Takashi Iwai8c50b372005-05-15 15:43:54 +02001922 case SNDRV_TIMER_IOCTL_START_OLD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923 return snd_timer_user_start(file);
1924 case SNDRV_TIMER_IOCTL_STOP:
Takashi Iwai8c50b372005-05-15 15:43:54 +02001925 case SNDRV_TIMER_IOCTL_STOP_OLD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926 return snd_timer_user_stop(file);
1927 case SNDRV_TIMER_IOCTL_CONTINUE:
Takashi Iwai8c50b372005-05-15 15:43:54 +02001928 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929 return snd_timer_user_continue(file);
Takashi Iwai15790a62005-05-15 15:04:14 +02001930 case SNDRV_TIMER_IOCTL_PAUSE:
Takashi Iwai8c50b372005-05-15 15:43:54 +02001931 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
Takashi Iwai15790a62005-05-15 15:04:14 +02001932 return snd_timer_user_pause(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933 }
1934 return -ENOTTY;
1935}
1936
Takashi Iwaiaf368022016-01-13 17:48:01 +01001937static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1938 unsigned long arg)
1939{
1940 struct snd_timer_user *tu = file->private_data;
1941 long ret;
1942
1943 mutex_lock(&tu->ioctl_lock);
1944 ret = __snd_timer_user_ioctl(file, cmd, arg);
1945 mutex_unlock(&tu->ioctl_lock);
1946 return ret;
1947}
1948
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949static int snd_timer_user_fasync(int fd, struct file * file, int on)
1950{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001951 struct snd_timer_user *tu;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001952
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953 tu = file->private_data;
Jonathan Corbet60aa4922009-02-01 14:52:56 -07001954 return fasync_helper(fd, file, on, &tu->fasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001955}
1956
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001957static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1958 size_t count, loff_t *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001960 struct snd_timer_user *tu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961 long result = 0, unit;
Takashi Iwai4dff5c72016-02-08 17:26:58 +01001962 int qhead;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963 int err = 0;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001964
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965 tu = file->private_data;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001966 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 spin_lock_irq(&tu->qlock);
1968 while ((long)count - result >= unit) {
1969 while (!tu->qused) {
1970 wait_queue_t wait;
1971
1972 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1973 err = -EAGAIN;
Takashi Iwai4dff5c72016-02-08 17:26:58 +01001974 goto _error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975 }
1976
1977 set_current_state(TASK_INTERRUPTIBLE);
1978 init_waitqueue_entry(&wait, current);
1979 add_wait_queue(&tu->qchange_sleep, &wait);
1980
1981 spin_unlock_irq(&tu->qlock);
1982 schedule();
1983 spin_lock_irq(&tu->qlock);
1984
1985 remove_wait_queue(&tu->qchange_sleep, &wait);
1986
Takashi Iwai230323d2016-01-21 17:19:31 +01001987 if (tu->disconnected) {
1988 err = -ENODEV;
Takashi Iwai4dff5c72016-02-08 17:26:58 +01001989 goto _error;
Takashi Iwai230323d2016-01-21 17:19:31 +01001990 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001991 if (signal_pending(current)) {
1992 err = -ERESTARTSYS;
Takashi Iwai4dff5c72016-02-08 17:26:58 +01001993 goto _error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001994 }
1995 }
1996
Takashi Iwai4dff5c72016-02-08 17:26:58 +01001997 qhead = tu->qhead++;
1998 tu->qhead %= tu->queue_size;
Takashi Iwai3fa69932016-07-04 14:02:15 +02001999 tu->qused--;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000 spin_unlock_irq(&tu->qlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001
Vegard Nossum11749e02016-08-28 10:13:07 +02002002 mutex_lock(&tu->ioctl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003 if (tu->tread) {
Takashi Iwai4dff5c72016-02-08 17:26:58 +01002004 if (copy_to_user(buffer, &tu->tqueue[qhead],
2005 sizeof(struct snd_timer_tread)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002006 err = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007 } else {
Takashi Iwai4dff5c72016-02-08 17:26:58 +01002008 if (copy_to_user(buffer, &tu->queue[qhead],
2009 sizeof(struct snd_timer_read)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010 err = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011 }
Vegard Nossum11749e02016-08-28 10:13:07 +02002012 mutex_unlock(&tu->ioctl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014 spin_lock_irq(&tu->qlock);
Takashi Iwai4dff5c72016-02-08 17:26:58 +01002015 if (err < 0)
2016 goto _error;
2017 result += unit;
2018 buffer += unit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002019 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020 _error:
Takashi Iwai4dff5c72016-02-08 17:26:58 +01002021 spin_unlock_irq(&tu->qlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022 return result > 0 ? result : err;
2023}
2024
2025static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
2026{
2027 unsigned int mask;
Takashi Iwai53d2f742005-11-17 13:56:05 +01002028 struct snd_timer_user *tu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029
2030 tu = file->private_data;
2031
2032 poll_wait(file, &tu->qchange_sleep, wait);
Clemens Ladisch6b172a82005-10-12 17:20:21 +02002033
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034 mask = 0;
2035 if (tu->qused)
2036 mask |= POLLIN | POLLRDNORM;
Takashi Iwai230323d2016-01-21 17:19:31 +01002037 if (tu->disconnected)
2038 mask |= POLLERR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002039
2040 return mask;
2041}
2042
2043#ifdef CONFIG_COMPAT
2044#include "timer_compat.c"
2045#else
2046#define snd_timer_user_ioctl_compat NULL
2047#endif
2048
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08002049static const struct file_operations snd_timer_f_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -07002050{
2051 .owner = THIS_MODULE,
2052 .read = snd_timer_user_read,
2053 .open = snd_timer_user_open,
2054 .release = snd_timer_user_release,
Takashi Iwai02f48652010-04-13 11:49:04 +02002055 .llseek = no_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056 .poll = snd_timer_user_poll,
2057 .unlocked_ioctl = snd_timer_user_ioctl,
2058 .compat_ioctl = snd_timer_user_ioctl_compat,
2059 .fasync = snd_timer_user_fasync,
2060};
2061
Takashi Iwai7c358602015-01-29 18:09:05 +01002062/* unregister the system timer */
2063static void snd_timer_free_all(void)
2064{
2065 struct snd_timer *timer, *n;
2066
2067 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list)
2068 snd_timer_free(timer);
2069}
2070
Takashi Iwai89da0612015-01-29 18:12:26 +01002071static struct device timer_dev;
2072
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073/*
2074 * ENTRY functions
2075 */
2076
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077static int __init alsa_timer_init(void)
2078{
2079 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080
Takashi Iwai89da0612015-01-29 18:12:26 +01002081 snd_device_initialize(&timer_dev, NULL);
2082 dev_set_name(&timer_dev, "timer");
2083
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084#ifdef SNDRV_OSS_INFO_DEV_TIMERS
Clemens Ladisch6b172a82005-10-12 17:20:21 +02002085 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
2086 "system timer");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087#endif
Takashi Iwaie28563c2005-12-01 10:42:42 +01002088
Takashi Iwai7c358602015-01-29 18:09:05 +01002089 err = snd_timer_register_system();
2090 if (err < 0) {
Takashi Iwaicf74dcf2014-02-04 18:22:39 +01002091 pr_err("ALSA: unable to register system timer (%i)\n", err);
Takashi Iwai89da0612015-01-29 18:12:26 +01002092 put_device(&timer_dev);
Takashi Iwai7c358602015-01-29 18:09:05 +01002093 return err;
2094 }
2095
Takashi Iwai40a4b262015-01-30 08:34:58 +01002096 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
2097 &snd_timer_f_ops, NULL, &timer_dev);
Takashi Iwai7c358602015-01-29 18:09:05 +01002098 if (err < 0) {
Takashi Iwaicf74dcf2014-02-04 18:22:39 +01002099 pr_err("ALSA: unable to register timer device (%i)\n", err);
Takashi Iwai7c358602015-01-29 18:09:05 +01002100 snd_timer_free_all();
Takashi Iwai89da0612015-01-29 18:12:26 +01002101 put_device(&timer_dev);
Takashi Iwai7c358602015-01-29 18:09:05 +01002102 return err;
2103 }
2104
Takashi Iwaie28563c2005-12-01 10:42:42 +01002105 snd_timer_proc_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002106 return 0;
2107}
2108
2109static void __exit alsa_timer_exit(void)
2110{
Takashi Iwai40a4b262015-01-30 08:34:58 +01002111 snd_unregister_device(&timer_dev);
Takashi Iwai7c358602015-01-29 18:09:05 +01002112 snd_timer_free_all();
Takashi Iwai89da0612015-01-29 18:12:26 +01002113 put_device(&timer_dev);
Takashi Iwaie28563c2005-12-01 10:42:42 +01002114 snd_timer_proc_done();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115#ifdef SNDRV_OSS_INFO_DEV_TIMERS
2116 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
2117#endif
2118}
2119
2120module_init(alsa_timer_init)
2121module_exit(alsa_timer_exit)
2122
2123EXPORT_SYMBOL(snd_timer_open);
2124EXPORT_SYMBOL(snd_timer_close);
2125EXPORT_SYMBOL(snd_timer_resolution);
2126EXPORT_SYMBOL(snd_timer_start);
2127EXPORT_SYMBOL(snd_timer_stop);
2128EXPORT_SYMBOL(snd_timer_continue);
2129EXPORT_SYMBOL(snd_timer_pause);
2130EXPORT_SYMBOL(snd_timer_new);
2131EXPORT_SYMBOL(snd_timer_notify);
2132EXPORT_SYMBOL(snd_timer_global_new);
2133EXPORT_SYMBOL(snd_timer_global_free);
2134EXPORT_SYMBOL(snd_timer_global_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135EXPORT_SYMBOL(snd_timer_interrupt);