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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <sound/core.h>
31#include <sound/timer.h>
32#include <sound/control.h>
33#include <sound/info.h>
34#include <sound/minors.h>
35#include <sound/initval.h>
36#include <linux/kmod.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Takashi Iwai8eeaa2f2014-02-10 09:48:47 +010038#if IS_ENABLED(CONFIG_SND_HRTIMER)
Clemens Ladisch109fef92010-11-18 09:53:54 +010039#define DEFAULT_TIMER_LIMIT 4
Takashi Iwai8eeaa2f2014-02-10 09:48:47 +010040#elif IS_ENABLED(CONFIG_SND_RTCTIMER)
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#define DEFAULT_TIMER_LIMIT 2
42#else
43#define DEFAULT_TIMER_LIMIT 1
44#endif
45
46static int timer_limit = DEFAULT_TIMER_LIMIT;
Jaroslav Kyselab751eef2007-12-13 10:19:42 +010047static int timer_tstamp_monotonic = 1;
Jaroslav Kyselac1017a42007-10-15 09:50:19 +020048MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
Linus Torvalds1da177e2005-04-16 15:20:36 -070049MODULE_DESCRIPTION("ALSA timer interface");
50MODULE_LICENSE("GPL");
51module_param(timer_limit, int, 0444);
52MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
Jaroslav Kyselab751eef2007-12-13 10:19:42 +010053module_param(timer_tstamp_monotonic, int, 0444);
54MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Kay Sievers03cfe6f2010-11-23 17:43:19 +010056MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
57MODULE_ALIAS("devname:snd/timer");
58
Takashi Iwai53d2f742005-11-17 13:56:05 +010059struct snd_timer_user {
60 struct snd_timer_instance *timeri;
Clemens Ladisch6b172a82005-10-12 17:20:21 +020061 int tread; /* enhanced read with timestamps and events */
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 unsigned long ticks;
63 unsigned long overrun;
64 int qhead;
65 int qtail;
66 int qused;
67 int queue_size;
Takashi Iwai53d2f742005-11-17 13:56:05 +010068 struct snd_timer_read *queue;
69 struct snd_timer_tread *tqueue;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 spinlock_t qlock;
71 unsigned long last_resolution;
72 unsigned int filter;
73 struct timespec tstamp; /* trigger tstamp */
74 wait_queue_head_t qchange_sleep;
75 struct fasync_struct *fasync;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010076 struct mutex tread_sem;
Takashi Iwai53d2f742005-11-17 13:56:05 +010077};
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79/* list of timers */
80static LIST_HEAD(snd_timer_list);
81
82/* list of slave instances */
83static LIST_HEAD(snd_timer_slave_list);
84
85/* lock for slave active lists */
86static DEFINE_SPINLOCK(slave_active_lock);
87
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010088static DEFINE_MUTEX(register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Takashi Iwai53d2f742005-11-17 13:56:05 +010090static int snd_timer_free(struct snd_timer *timer);
91static int snd_timer_dev_free(struct snd_device *device);
92static int snd_timer_dev_register(struct snd_device *device);
Takashi Iwaic4614822006-06-23 14:38:23 +020093static int snd_timer_dev_disconnect(struct snd_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Takashi Iwai53d2f742005-11-17 13:56:05 +010095static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97/*
98 * create a timer instance with the given owner string.
99 * when timer is not NULL, increments the module counter
100 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100101static struct snd_timer_instance *snd_timer_instance_new(char *owner,
102 struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100104 struct snd_timer_instance *timeri;
Takashi Iwaica2c0962005-09-09 14:20:23 +0200105 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 if (timeri == NULL)
107 return NULL;
Paulo Marques543537b2005-06-23 00:09:02 -0700108 timeri->owner = kstrdup(owner, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 if (! timeri->owner) {
110 kfree(timeri);
111 return NULL;
112 }
113 INIT_LIST_HEAD(&timeri->open_list);
114 INIT_LIST_HEAD(&timeri->active_list);
115 INIT_LIST_HEAD(&timeri->ack_list);
116 INIT_LIST_HEAD(&timeri->slave_list_head);
117 INIT_LIST_HEAD(&timeri->slave_active_head);
118
119 timeri->timer = timer;
Clemens Ladischde242142005-10-12 17:12:31 +0200120 if (timer && !try_module_get(timer->module)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 kfree(timeri->owner);
122 kfree(timeri);
123 return NULL;
124 }
125
126 return timeri;
127}
128
129/*
130 * find a timer instance from the given timer id
131 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100132static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100134 struct snd_timer *timer = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Johannes Berg9244b2c2006-10-05 16:02:22 +0200136 list_for_each_entry(timer, &snd_timer_list, device_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 if (timer->tmr_class != tid->dev_class)
138 continue;
139 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
140 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
141 (timer->card == NULL ||
142 timer->card->number != tid->card))
143 continue;
144 if (timer->tmr_device != tid->device)
145 continue;
146 if (timer->tmr_subdevice != tid->subdevice)
147 continue;
148 return timer;
149 }
150 return NULL;
151}
152
Johannes Bergee2da992008-07-09 10:28:41 +0200153#ifdef CONFIG_MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
Takashi Iwai53d2f742005-11-17 13:56:05 +0100155static void snd_timer_request(struct snd_timer_id *tid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 switch (tid->dev_class) {
158 case SNDRV_TIMER_CLASS_GLOBAL:
159 if (tid->device < timer_limit)
160 request_module("snd-timer-%i", tid->device);
161 break;
162 case SNDRV_TIMER_CLASS_CARD:
163 case SNDRV_TIMER_CLASS_PCM:
164 if (tid->card < snd_ecards_limit)
165 request_module("snd-card-%i", tid->card);
166 break;
167 default:
168 break;
169 }
170}
171
172#endif
173
174/*
175 * look for a master instance matching with the slave id of the given slave.
176 * when found, relink the open_link of the slave.
177 *
178 * call this with register_mutex down.
179 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100180static void snd_timer_check_slave(struct snd_timer_instance *slave)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100182 struct snd_timer *timer;
183 struct snd_timer_instance *master;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
185 /* FIXME: it's really dumb to look up all entries.. */
Johannes Berg9244b2c2006-10-05 16:02:22 +0200186 list_for_each_entry(timer, &snd_timer_list, device_list) {
187 list_for_each_entry(master, &timer->open_list_head, open_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 if (slave->slave_class == master->slave_class &&
189 slave->slave_id == master->slave_id) {
Nicolas Kaiser5b7c7572011-03-16 17:10:11 +0100190 list_move_tail(&slave->open_list,
191 &master->slave_list_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 spin_lock_irq(&slave_active_lock);
193 slave->master = master;
194 slave->timer = master->timer;
195 spin_unlock_irq(&slave_active_lock);
196 return;
197 }
198 }
199 }
200}
201
202/*
203 * look for slave instances matching with the slave id of the given master.
204 * when found, relink the open_link of slaves.
205 *
206 * call this with register_mutex down.
207 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100208static void snd_timer_check_master(struct snd_timer_instance *master)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
Johannes Berg9244b2c2006-10-05 16:02:22 +0200210 struct snd_timer_instance *slave, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
212 /* check all pending slaves */
Johannes Berg9244b2c2006-10-05 16:02:22 +0200213 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 if (slave->slave_class == master->slave_class &&
215 slave->slave_id == master->slave_id) {
Johannes Berg9244b2c2006-10-05 16:02:22 +0200216 list_move_tail(&slave->open_list, &master->slave_list_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 spin_lock_irq(&slave_active_lock);
218 slave->master = master;
219 slave->timer = master->timer;
220 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200221 list_add_tail(&slave->active_list,
222 &master->slave_active_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 spin_unlock_irq(&slave_active_lock);
224 }
225 }
226}
227
228/*
229 * open a timer instance
230 * when opening a master, the slave id must be here given.
231 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100232int snd_timer_open(struct snd_timer_instance **ti,
233 char *owner, struct snd_timer_id *tid,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 unsigned int slave_id)
235{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100236 struct snd_timer *timer;
237 struct snd_timer_instance *timeri = NULL;
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200238
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
240 /* open a slave instance */
241 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
242 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
Takashi Iwaicf74dcf2014-02-04 18:22:39 +0100243 pr_debug("ALSA: timer: invalid slave class %i\n",
244 tid->dev_sclass);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 return -EINVAL;
246 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100247 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 timeri = snd_timer_instance_new(owner, NULL);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200249 if (!timeri) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100250 mutex_unlock(&register_mutex);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200251 return -ENOMEM;
252 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 timeri->slave_class = tid->dev_sclass;
254 timeri->slave_id = tid->device;
255 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
256 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
257 snd_timer_check_slave(timeri);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100258 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 *ti = timeri;
260 return 0;
261 }
262
263 /* open a master instance */
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100264 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 timer = snd_timer_find(tid);
Johannes Bergee2da992008-07-09 10:28:41 +0200266#ifdef CONFIG_MODULES
267 if (!timer) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100268 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 snd_timer_request(tid);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100270 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 timer = snd_timer_find(tid);
272 }
273#endif
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200274 if (!timer) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100275 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 return -ENODEV;
277 }
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200278 if (!list_empty(&timer->open_list_head)) {
279 timeri = list_entry(timer->open_list_head.next,
Takashi Iwai53d2f742005-11-17 13:56:05 +0100280 struct snd_timer_instance, open_list);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200281 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100282 mutex_unlock(&register_mutex);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200283 return -EBUSY;
284 }
285 }
286 timeri = snd_timer_instance_new(owner, timer);
287 if (!timeri) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100288 mutex_unlock(&register_mutex);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200289 return -ENOMEM;
290 }
291 timeri->slave_class = tid->dev_sclass;
292 timeri->slave_id = slave_id;
293 if (list_empty(&timer->open_list_head) && timer->hw.open)
294 timer->hw.open(timer);
295 list_add_tail(&timeri->open_list, &timer->open_list_head);
296 snd_timer_check_master(timeri);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100297 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 *ti = timeri;
299 return 0;
300}
301
Takashi Iwai53d2f742005-11-17 13:56:05 +0100302static int _snd_timer_stop(struct snd_timer_instance *timeri,
303 int keep_flag, int event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
305/*
306 * close a timer instance
307 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100308int snd_timer_close(struct snd_timer_instance *timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100310 struct snd_timer *timer = NULL;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200311 struct snd_timer_instance *slave, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
Takashi Iwai00728892008-08-14 07:51:57 +0200313 if (snd_BUG_ON(!timeri))
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200314 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
316 /* force to stop the timer */
317 snd_timer_stop(timeri);
318
319 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
320 /* wait, until the active callback is finished */
321 spin_lock_irq(&slave_active_lock);
322 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
323 spin_unlock_irq(&slave_active_lock);
324 udelay(10);
325 spin_lock_irq(&slave_active_lock);
326 }
327 spin_unlock_irq(&slave_active_lock);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100328 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 list_del(&timeri->open_list);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100330 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 } else {
332 timer = timeri->timer;
Takashi Iwai94094c82011-08-08 12:28:22 +0200333 if (snd_BUG_ON(!timer))
334 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 /* wait, until the active callback is finished */
336 spin_lock_irq(&timer->lock);
337 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
338 spin_unlock_irq(&timer->lock);
339 udelay(10);
340 spin_lock_irq(&timer->lock);
341 }
342 spin_unlock_irq(&timer->lock);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100343 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 list_del(&timeri->open_list);
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200345 if (timer && list_empty(&timer->open_list_head) &&
346 timer->hw.close)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 timer->hw.close(timer);
348 /* remove slave links */
Johannes Berg9244b2c2006-10-05 16:02:22 +0200349 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
350 open_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 spin_lock_irq(&slave_active_lock);
352 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200353 list_move_tail(&slave->open_list, &snd_timer_slave_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 slave->master = NULL;
355 slave->timer = NULL;
356 spin_unlock_irq(&slave_active_lock);
357 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100358 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 }
Takashi Iwai94094c82011-08-08 12:28:22 +0200360 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 if (timeri->private_free)
362 timeri->private_free(timeri);
363 kfree(timeri->owner);
364 kfree(timeri);
Clemens Ladischde242142005-10-12 17:12:31 +0200365 if (timer)
366 module_put(timer->module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 return 0;
368}
369
Takashi Iwai53d2f742005-11-17 13:56:05 +0100370unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100372 struct snd_timer * timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
374 if (timeri == NULL)
375 return 0;
376 if ((timer = timeri->timer) != NULL) {
377 if (timer->hw.c_resolution)
378 return timer->hw.c_resolution(timer);
379 return timer->hw.resolution;
380 }
381 return 0;
382}
383
Takashi Iwai53d2f742005-11-17 13:56:05 +0100384static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100386 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 unsigned long flags;
388 unsigned long resolution = 0;
Takashi Iwai53d2f742005-11-17 13:56:05 +0100389 struct snd_timer_instance *ts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 struct timespec tstamp;
391
Jaroslav Kyselab751eef2007-12-13 10:19:42 +0100392 if (timer_tstamp_monotonic)
Thomas Gleixner26204e02014-06-11 23:59:14 +0000393 ktime_get_ts(&tstamp);
Jaroslav Kyselab751eef2007-12-13 10:19:42 +0100394 else
395 getnstimeofday(&tstamp);
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200396 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
397 event > SNDRV_TIMER_EVENT_PAUSE))
398 return;
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200399 if (event == SNDRV_TIMER_EVENT_START ||
400 event == SNDRV_TIMER_EVENT_CONTINUE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 resolution = snd_timer_resolution(ti);
402 if (ti->ccallback)
Jaroslav Kyselab30477d2010-03-03 11:05:55 +0100403 ti->ccallback(ti, event, &tstamp, resolution);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
405 return;
406 timer = ti->timer;
407 if (timer == NULL)
408 return;
409 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
410 return;
411 spin_lock_irqsave(&timer->lock, flags);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200412 list_for_each_entry(ts, &ti->slave_active_head, active_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 if (ts->ccallback)
414 ts->ccallback(ti, event + 100, &tstamp, resolution);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 spin_unlock_irqrestore(&timer->lock, flags);
416}
417
Takashi Iwai53d2f742005-11-17 13:56:05 +0100418static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200419 unsigned long sticks)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420{
Nicolas Kaiser5b7c7572011-03-16 17:10:11 +0100421 list_move_tail(&timeri->active_list, &timer->active_list_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 if (timer->running) {
423 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
424 goto __start_now;
425 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
426 timeri->flags |= SNDRV_TIMER_IFLG_START;
427 return 1; /* delayed start */
428 } else {
429 timer->sticks = sticks;
430 timer->hw.start(timer);
431 __start_now:
432 timer->running++;
433 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
434 return 0;
435 }
436}
437
Takashi Iwai53d2f742005-11-17 13:56:05 +0100438static int snd_timer_start_slave(struct snd_timer_instance *timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439{
440 unsigned long flags;
441
442 spin_lock_irqsave(&slave_active_lock, flags);
443 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
444 if (timeri->master)
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200445 list_add_tail(&timeri->active_list,
446 &timeri->master->slave_active_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 spin_unlock_irqrestore(&slave_active_lock, flags);
448 return 1; /* delayed start */
449}
450
451/*
452 * start the timer instance
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200453 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100454int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100456 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 int result = -EINVAL;
458 unsigned long flags;
459
460 if (timeri == NULL || ticks < 1)
461 return -EINVAL;
462 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
463 result = snd_timer_start_slave(timeri);
464 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
465 return result;
466 }
467 timer = timeri->timer;
468 if (timer == NULL)
469 return -EINVAL;
470 spin_lock_irqsave(&timer->lock, flags);
471 timeri->ticks = timeri->cticks = ticks;
472 timeri->pticks = 0;
473 result = snd_timer_start1(timer, timeri, ticks);
474 spin_unlock_irqrestore(&timer->lock, flags);
475 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
476 return result;
477}
478
Takashi Iwai53d2f742005-11-17 13:56:05 +0100479static int _snd_timer_stop(struct snd_timer_instance * timeri,
480 int keep_flag, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100482 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 unsigned long flags;
484
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200485 if (snd_BUG_ON(!timeri))
486 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
488 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
489 if (!keep_flag) {
490 spin_lock_irqsave(&slave_active_lock, flags);
491 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
492 spin_unlock_irqrestore(&slave_active_lock, flags);
493 }
494 goto __end;
495 }
496 timer = timeri->timer;
497 if (!timer)
498 return -EINVAL;
499 spin_lock_irqsave(&timer->lock, flags);
500 list_del_init(&timeri->ack_list);
501 list_del_init(&timeri->active_list);
502 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
503 !(--timer->running)) {
504 timer->hw.stop(timer);
505 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
506 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
507 snd_timer_reschedule(timer, 0);
508 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
509 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
510 timer->hw.start(timer);
511 }
512 }
513 }
514 if (!keep_flag)
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200515 timeri->flags &=
516 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 spin_unlock_irqrestore(&timer->lock, flags);
518 __end:
519 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
520 snd_timer_notify1(timeri, event);
521 return 0;
522}
523
524/*
525 * stop the timer instance.
526 *
527 * do not call this from the timer callback!
528 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100529int snd_timer_stop(struct snd_timer_instance *timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100531 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 unsigned long flags;
533 int err;
534
535 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
536 if (err < 0)
537 return err;
538 timer = timeri->timer;
Takashi Iwai0584ffa2011-08-08 12:24:46 +0200539 if (!timer)
540 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 spin_lock_irqsave(&timer->lock, flags);
542 timeri->cticks = timeri->ticks;
543 timeri->pticks = 0;
544 spin_unlock_irqrestore(&timer->lock, flags);
545 return 0;
546}
547
548/*
549 * start again.. the tick is kept.
550 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100551int snd_timer_continue(struct snd_timer_instance *timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100553 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 int result = -EINVAL;
555 unsigned long flags;
556
557 if (timeri == NULL)
558 return result;
559 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
560 return snd_timer_start_slave(timeri);
561 timer = timeri->timer;
562 if (! timer)
563 return -EINVAL;
564 spin_lock_irqsave(&timer->lock, flags);
565 if (!timeri->cticks)
566 timeri->cticks = 1;
567 timeri->pticks = 0;
568 result = snd_timer_start1(timer, timeri, timer->sticks);
569 spin_unlock_irqrestore(&timer->lock, flags);
570 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
571 return result;
572}
573
574/*
575 * pause.. remember the ticks left
576 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100577int snd_timer_pause(struct snd_timer_instance * timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578{
579 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
580}
581
582/*
583 * reschedule the timer
584 *
585 * start pending instances and check the scheduling ticks.
586 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
587 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100588static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100590 struct snd_timer_instance *ti;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 unsigned long ticks = ~0UL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
Johannes Berg9244b2c2006-10-05 16:02:22 +0200593 list_for_each_entry(ti, &timer->active_list_head, active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 if (ti->flags & SNDRV_TIMER_IFLG_START) {
595 ti->flags &= ~SNDRV_TIMER_IFLG_START;
596 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
597 timer->running++;
598 }
599 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
600 if (ticks > ti->cticks)
601 ticks = ti->cticks;
602 }
603 }
604 if (ticks == ~0UL) {
605 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
606 return;
607 }
608 if (ticks > timer->hw.ticks)
609 ticks = timer->hw.ticks;
610 if (ticks_left != ticks)
611 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
612 timer->sticks = ticks;
613}
614
615/*
616 * timer tasklet
617 *
618 */
619static void snd_timer_tasklet(unsigned long arg)
620{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100621 struct snd_timer *timer = (struct snd_timer *) arg;
622 struct snd_timer_instance *ti;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 struct list_head *p;
624 unsigned long resolution, ticks;
Takashi Iwai2999ff52006-07-05 17:16:58 +0200625 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
Takashi Iwai2999ff52006-07-05 17:16:58 +0200627 spin_lock_irqsave(&timer->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 /* now process all callbacks */
629 while (!list_empty(&timer->sack_list_head)) {
630 p = timer->sack_list_head.next; /* get first item */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100631 ti = list_entry(p, struct snd_timer_instance, ack_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
633 /* remove from ack_list and make empty */
634 list_del_init(p);
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200635
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 ticks = ti->pticks;
637 ti->pticks = 0;
638 resolution = ti->resolution;
639
640 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
641 spin_unlock(&timer->lock);
642 if (ti->callback)
643 ti->callback(ti, resolution, ticks);
644 spin_lock(&timer->lock);
645 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
646 }
Takashi Iwai2999ff52006-07-05 17:16:58 +0200647 spin_unlock_irqrestore(&timer->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648}
649
650/*
651 * timer interrupt
652 *
653 * ticks_left is usually equal to timer->sticks.
654 *
655 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100656void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657{
Johannes Berg9244b2c2006-10-05 16:02:22 +0200658 struct snd_timer_instance *ti, *ts, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 unsigned long resolution, ticks;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200660 struct list_head *p, *ack_list_head;
Takashi Iwaib32425a2005-11-18 18:52:14 +0100661 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 int use_tasklet = 0;
663
664 if (timer == NULL)
665 return;
666
Takashi Iwaib32425a2005-11-18 18:52:14 +0100667 spin_lock_irqsave(&timer->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
669 /* remember the current resolution */
670 if (timer->hw.c_resolution)
671 resolution = timer->hw.c_resolution(timer);
672 else
673 resolution = timer->hw.resolution;
674
675 /* loop for all active instances
Johannes Berg9244b2c2006-10-05 16:02:22 +0200676 * Here we cannot use list_for_each_entry because the active_list of a
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200677 * processed instance is relinked to done_list_head before the callback
678 * is called.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 */
Johannes Berg9244b2c2006-10-05 16:02:22 +0200680 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
681 active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
683 continue;
684 ti->pticks += ticks_left;
685 ti->resolution = resolution;
686 if (ti->cticks < ticks_left)
687 ti->cticks = 0;
688 else
689 ti->cticks -= ticks_left;
690 if (ti->cticks) /* not expired */
691 continue;
692 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
693 ti->cticks = ti->ticks;
694 } else {
695 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
696 if (--timer->running)
Johannes Berg9244b2c2006-10-05 16:02:22 +0200697 list_del(&ti->active_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 }
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200699 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
700 (ti->flags & SNDRV_TIMER_IFLG_FAST))
701 ack_list_head = &timer->ack_list_head;
702 else
703 ack_list_head = &timer->sack_list_head;
704 if (list_empty(&ti->ack_list))
705 list_add_tail(&ti->ack_list, ack_list_head);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200706 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 ts->pticks = ti->pticks;
708 ts->resolution = resolution;
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200709 if (list_empty(&ts->ack_list))
710 list_add_tail(&ts->ack_list, ack_list_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 }
712 }
713 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
Clemens Ladischcd93fe42006-07-17 16:53:57 +0200714 snd_timer_reschedule(timer, timer->sticks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 if (timer->running) {
716 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
717 timer->hw.stop(timer);
718 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
719 }
720 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
721 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
722 /* restart timer */
723 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
724 timer->hw.start(timer);
725 }
726 } else {
727 timer->hw.stop(timer);
728 }
729
730 /* now process all fast callbacks */
731 while (!list_empty(&timer->ack_list_head)) {
732 p = timer->ack_list_head.next; /* get first item */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100733 ti = list_entry(p, struct snd_timer_instance, ack_list);
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200734
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 /* remove from ack_list and make empty */
736 list_del_init(p);
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200737
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 ticks = ti->pticks;
739 ti->pticks = 0;
740
741 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
742 spin_unlock(&timer->lock);
743 if (ti->callback)
744 ti->callback(ti, resolution, ticks);
745 spin_lock(&timer->lock);
746 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
747 }
748
749 /* do we have any slow callbacks? */
750 use_tasklet = !list_empty(&timer->sack_list_head);
Takashi Iwaib32425a2005-11-18 18:52:14 +0100751 spin_unlock_irqrestore(&timer->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752
753 if (use_tasklet)
Takashi Iwai1f041282008-12-18 12:17:55 +0100754 tasklet_schedule(&timer->task_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755}
756
757/*
758
759 */
760
Takashi Iwai53d2f742005-11-17 13:56:05 +0100761int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
762 struct snd_timer **rtimer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100764 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 int err;
Takashi Iwai53d2f742005-11-17 13:56:05 +0100766 static struct snd_device_ops ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 .dev_free = snd_timer_dev_free,
768 .dev_register = snd_timer_dev_register,
Takashi Iwaic4614822006-06-23 14:38:23 +0200769 .dev_disconnect = snd_timer_dev_disconnect,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 };
771
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200772 if (snd_BUG_ON(!tid))
773 return -EINVAL;
774 if (rtimer)
775 *rtimer = NULL;
Takashi Iwaica2c0962005-09-09 14:20:23 +0200776 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100777 if (timer == NULL) {
Takashi Iwaicf74dcf2014-02-04 18:22:39 +0100778 pr_err("ALSA: timer: cannot allocate\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 return -ENOMEM;
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100780 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 timer->tmr_class = tid->dev_class;
782 timer->card = card;
783 timer->tmr_device = tid->device;
784 timer->tmr_subdevice = tid->subdevice;
785 if (id)
786 strlcpy(timer->id, id, sizeof(timer->id));
787 INIT_LIST_HEAD(&timer->device_list);
788 INIT_LIST_HEAD(&timer->open_list_head);
789 INIT_LIST_HEAD(&timer->active_list_head);
790 INIT_LIST_HEAD(&timer->ack_list_head);
791 INIT_LIST_HEAD(&timer->sack_list_head);
792 spin_lock_init(&timer->lock);
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200793 tasklet_init(&timer->task_queue, snd_timer_tasklet,
794 (unsigned long)timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 if (card != NULL) {
Clemens Ladischde242142005-10-12 17:12:31 +0200796 timer->module = card->module;
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200797 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
798 if (err < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 snd_timer_free(timer);
800 return err;
801 }
802 }
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200803 if (rtimer)
804 *rtimer = timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 return 0;
806}
807
Takashi Iwai53d2f742005-11-17 13:56:05 +0100808static int snd_timer_free(struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809{
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200810 if (!timer)
811 return 0;
Takashi Iwaic4614822006-06-23 14:38:23 +0200812
813 mutex_lock(&register_mutex);
814 if (! list_empty(&timer->open_list_head)) {
815 struct list_head *p, *n;
816 struct snd_timer_instance *ti;
Takashi Iwaicf74dcf2014-02-04 18:22:39 +0100817 pr_warn("ALSA: timer %p is busy?\n", timer);
Takashi Iwaic4614822006-06-23 14:38:23 +0200818 list_for_each_safe(p, n, &timer->open_list_head) {
819 list_del_init(p);
820 ti = list_entry(p, struct snd_timer_instance, open_list);
821 ti->timer = NULL;
822 }
823 }
824 list_del(&timer->device_list);
825 mutex_unlock(&register_mutex);
826
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 if (timer->private_free)
828 timer->private_free(timer);
829 kfree(timer);
830 return 0;
831}
832
Takashi Iwai53d2f742005-11-17 13:56:05 +0100833static int snd_timer_dev_free(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100835 struct snd_timer *timer = device->device_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 return snd_timer_free(timer);
837}
838
Takashi Iwai53d2f742005-11-17 13:56:05 +0100839static int snd_timer_dev_register(struct snd_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100841 struct snd_timer *timer = dev->device_data;
842 struct snd_timer *timer1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200844 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
845 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
847 !timer->hw.resolution && timer->hw.c_resolution == NULL)
848 return -EINVAL;
849
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100850 mutex_lock(&register_mutex);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200851 list_for_each_entry(timer1, &snd_timer_list, device_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 if (timer1->tmr_class > timer->tmr_class)
853 break;
854 if (timer1->tmr_class < timer->tmr_class)
855 continue;
856 if (timer1->card && timer->card) {
857 if (timer1->card->number > timer->card->number)
858 break;
859 if (timer1->card->number < timer->card->number)
860 continue;
861 }
862 if (timer1->tmr_device > timer->tmr_device)
863 break;
864 if (timer1->tmr_device < timer->tmr_device)
865 continue;
866 if (timer1->tmr_subdevice > timer->tmr_subdevice)
867 break;
868 if (timer1->tmr_subdevice < timer->tmr_subdevice)
869 continue;
870 /* conflicts.. */
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100871 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 return -EBUSY;
873 }
Johannes Berg9244b2c2006-10-05 16:02:22 +0200874 list_add_tail(&timer->device_list, &timer1->device_list);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100875 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 return 0;
877}
878
Takashi Iwaic4614822006-06-23 14:38:23 +0200879static int snd_timer_dev_disconnect(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100881 struct snd_timer *timer = device->device_data;
Takashi Iwaic4614822006-06-23 14:38:23 +0200882 mutex_lock(&register_mutex);
883 list_del_init(&timer->device_list);
884 mutex_unlock(&register_mutex);
885 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886}
887
Takashi Iwai53d2f742005-11-17 13:56:05 +0100888void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889{
890 unsigned long flags;
891 unsigned long resolution = 0;
Takashi Iwai53d2f742005-11-17 13:56:05 +0100892 struct snd_timer_instance *ti, *ts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
Takashi Iwai7c22f1a2005-10-10 11:46:31 +0200894 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
895 return;
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200896 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
897 event > SNDRV_TIMER_EVENT_MRESUME))
898 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 spin_lock_irqsave(&timer->lock, flags);
Jaroslav Kyselaa501dfa2005-08-16 11:09:05 +0200900 if (event == SNDRV_TIMER_EVENT_MSTART ||
901 event == SNDRV_TIMER_EVENT_MCONTINUE ||
902 event == SNDRV_TIMER_EVENT_MRESUME) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 if (timer->hw.c_resolution)
904 resolution = timer->hw.c_resolution(timer);
905 else
906 resolution = timer->hw.resolution;
907 }
Johannes Berg9244b2c2006-10-05 16:02:22 +0200908 list_for_each_entry(ti, &timer->active_list_head, active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 if (ti->ccallback)
910 ti->ccallback(ti, event, tstamp, resolution);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200911 list_for_each_entry(ts, &ti->slave_active_head, active_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 if (ts->ccallback)
913 ts->ccallback(ts, event, tstamp, resolution);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 }
915 spin_unlock_irqrestore(&timer->lock, flags);
916}
917
918/*
919 * exported functions for global timers
920 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100921int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100923 struct snd_timer_id tid;
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200924
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
926 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
927 tid.card = -1;
928 tid.device = device;
929 tid.subdevice = 0;
930 return snd_timer_new(NULL, id, &tid, rtimer);
931}
932
Takashi Iwai53d2f742005-11-17 13:56:05 +0100933int snd_timer_global_free(struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934{
935 return snd_timer_free(timer);
936}
937
Takashi Iwai53d2f742005-11-17 13:56:05 +0100938int snd_timer_global_register(struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100940 struct snd_device dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
942 memset(&dev, 0, sizeof(dev));
943 dev.device_data = timer;
944 return snd_timer_dev_register(&dev);
945}
946
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200947/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 * System timer
949 */
950
951struct snd_timer_system_private {
952 struct timer_list tlist;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 unsigned long last_expires;
954 unsigned long last_jiffies;
955 unsigned long correction;
956};
957
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958static void snd_timer_s_function(unsigned long data)
959{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100960 struct snd_timer *timer = (struct snd_timer *)data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 struct snd_timer_system_private *priv = timer->private_data;
962 unsigned long jiff = jiffies;
963 if (time_after(jiff, priv->last_expires))
Clemens Ladisch6ed5eff2006-07-17 16:51:37 +0200964 priv->correction += (long)jiff - (long)priv->last_expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
966}
967
Takashi Iwai53d2f742005-11-17 13:56:05 +0100968static int snd_timer_s_start(struct snd_timer * timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969{
970 struct snd_timer_system_private *priv;
971 unsigned long njiff;
972
973 priv = (struct snd_timer_system_private *) timer->private_data;
974 njiff = (priv->last_jiffies = jiffies);
975 if (priv->correction > timer->sticks - 1) {
976 priv->correction -= timer->sticks - 1;
977 njiff++;
978 } else {
979 njiff += timer->sticks - priv->correction;
Clemens Ladisch17f48ec2006-07-17 16:50:56 +0200980 priv->correction = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 }
982 priv->last_expires = priv->tlist.expires = njiff;
983 add_timer(&priv->tlist);
984 return 0;
985}
986
Takashi Iwai53d2f742005-11-17 13:56:05 +0100987static int snd_timer_s_stop(struct snd_timer * timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988{
989 struct snd_timer_system_private *priv;
990 unsigned long jiff;
991
992 priv = (struct snd_timer_system_private *) timer->private_data;
993 del_timer(&priv->tlist);
994 jiff = jiffies;
995 if (time_before(jiff, priv->last_expires))
996 timer->sticks = priv->last_expires - jiff;
997 else
998 timer->sticks = 1;
Clemens Ladischde2696d2006-07-17 16:52:09 +0200999 priv->correction = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 return 0;
1001}
1002
Takashi Iwai53d2f742005-11-17 13:56:05 +01001003static struct snd_timer_hardware snd_timer_system =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004{
1005 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1006 .resolution = 1000000000L / HZ,
1007 .ticks = 10000000L,
1008 .start = snd_timer_s_start,
1009 .stop = snd_timer_s_stop
1010};
1011
Takashi Iwai53d2f742005-11-17 13:56:05 +01001012static void snd_timer_free_system(struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013{
1014 kfree(timer->private_data);
1015}
1016
1017static int snd_timer_register_system(void)
1018{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001019 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 struct snd_timer_system_private *priv;
1021 int err;
1022
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001023 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1024 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 return err;
1026 strcpy(timer->name, "system timer");
1027 timer->hw = snd_timer_system;
Takashi Iwaica2c0962005-09-09 14:20:23 +02001028 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 if (priv == NULL) {
1030 snd_timer_free(timer);
1031 return -ENOMEM;
1032 }
1033 init_timer(&priv->tlist);
1034 priv->tlist.function = snd_timer_s_function;
1035 priv->tlist.data = (unsigned long) timer;
1036 timer->private_data = priv;
1037 timer->private_free = snd_timer_free_system;
1038 return snd_timer_global_register(timer);
1039}
1040
Takashi Iwaie28563c2005-12-01 10:42:42 +01001041#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042/*
1043 * Info interface
1044 */
1045
Takashi Iwai53d2f742005-11-17 13:56:05 +01001046static void snd_timer_proc_read(struct snd_info_entry *entry,
1047 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001049 struct snd_timer *timer;
1050 struct snd_timer_instance *ti;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001052 mutex_lock(&register_mutex);
Johannes Berg9244b2c2006-10-05 16:02:22 +02001053 list_for_each_entry(timer, &snd_timer_list, device_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 switch (timer->tmr_class) {
1055 case SNDRV_TIMER_CLASS_GLOBAL:
1056 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1057 break;
1058 case SNDRV_TIMER_CLASS_CARD:
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001059 snd_iprintf(buffer, "C%i-%i: ",
1060 timer->card->number, timer->tmr_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 break;
1062 case SNDRV_TIMER_CLASS_PCM:
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001063 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1064 timer->tmr_device, timer->tmr_subdevice);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 break;
1066 default:
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001067 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1068 timer->card ? timer->card->number : -1,
1069 timer->tmr_device, timer->tmr_subdevice);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 }
1071 snd_iprintf(buffer, "%s :", timer->name);
1072 if (timer->hw.resolution)
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001073 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1074 timer->hw.resolution / 1000,
1075 timer->hw.resolution % 1000,
1076 timer->hw.ticks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1078 snd_iprintf(buffer, " SLAVE");
1079 snd_iprintf(buffer, "\n");
Johannes Berg9244b2c2006-10-05 16:02:22 +02001080 list_for_each_entry(ti, &timer->open_list_head, open_list)
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001081 snd_iprintf(buffer, " Client %s : %s\n",
1082 ti->owner ? ti->owner : "unknown",
1083 ti->flags & (SNDRV_TIMER_IFLG_START |
1084 SNDRV_TIMER_IFLG_RUNNING)
1085 ? "running" : "stopped");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001087 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088}
1089
Takashi Iwai6581f4e2006-05-17 17:14:51 +02001090static struct snd_info_entry *snd_timer_proc_entry;
Takashi Iwaie28563c2005-12-01 10:42:42 +01001091
1092static void __init snd_timer_proc_init(void)
1093{
1094 struct snd_info_entry *entry;
1095
1096 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1097 if (entry != NULL) {
Takashi Iwaie28563c2005-12-01 10:42:42 +01001098 entry->c.text.read = snd_timer_proc_read;
1099 if (snd_info_register(entry) < 0) {
1100 snd_info_free_entry(entry);
1101 entry = NULL;
1102 }
1103 }
1104 snd_timer_proc_entry = entry;
1105}
1106
1107static void __exit snd_timer_proc_done(void)
1108{
Takashi Iwai746d4a02006-06-23 14:37:59 +02001109 snd_info_free_entry(snd_timer_proc_entry);
Takashi Iwaie28563c2005-12-01 10:42:42 +01001110}
1111#else /* !CONFIG_PROC_FS */
1112#define snd_timer_proc_init()
1113#define snd_timer_proc_done()
1114#endif
1115
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116/*
1117 * USER SPACE interface
1118 */
1119
Takashi Iwai53d2f742005-11-17 13:56:05 +01001120static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 unsigned long resolution,
1122 unsigned long ticks)
1123{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001124 struct snd_timer_user *tu = timeri->callback_data;
1125 struct snd_timer_read *r;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 int prev;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001127
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 spin_lock(&tu->qlock);
1129 if (tu->qused > 0) {
1130 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1131 r = &tu->queue[prev];
1132 if (r->resolution == resolution) {
1133 r->ticks += ticks;
1134 goto __wake;
1135 }
1136 }
1137 if (tu->qused >= tu->queue_size) {
1138 tu->overrun++;
1139 } else {
1140 r = &tu->queue[tu->qtail++];
1141 tu->qtail %= tu->queue_size;
1142 r->resolution = resolution;
1143 r->ticks = ticks;
1144 tu->qused++;
1145 }
1146 __wake:
1147 spin_unlock(&tu->qlock);
1148 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1149 wake_up(&tu->qchange_sleep);
1150}
1151
Takashi Iwai53d2f742005-11-17 13:56:05 +01001152static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1153 struct snd_timer_tread *tread)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154{
1155 if (tu->qused >= tu->queue_size) {
1156 tu->overrun++;
1157 } else {
1158 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1159 tu->qtail %= tu->queue_size;
1160 tu->qused++;
1161 }
1162}
1163
Takashi Iwai53d2f742005-11-17 13:56:05 +01001164static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1165 int event,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 struct timespec *tstamp,
1167 unsigned long resolution)
1168{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001169 struct snd_timer_user *tu = timeri->callback_data;
1170 struct snd_timer_tread r1;
Dan Carpenterbfe70782010-04-28 10:29:14 +02001171 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001173 if (event >= SNDRV_TIMER_EVENT_START &&
1174 event <= SNDRV_TIMER_EVENT_PAUSE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 tu->tstamp = *tstamp;
1176 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1177 return;
1178 r1.event = event;
1179 r1.tstamp = *tstamp;
1180 r1.val = resolution;
Dan Carpenterbfe70782010-04-28 10:29:14 +02001181 spin_lock_irqsave(&tu->qlock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 snd_timer_user_append_to_tqueue(tu, &r1);
Dan Carpenterbfe70782010-04-28 10:29:14 +02001183 spin_unlock_irqrestore(&tu->qlock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1185 wake_up(&tu->qchange_sleep);
1186}
1187
Takashi Iwai53d2f742005-11-17 13:56:05 +01001188static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 unsigned long resolution,
1190 unsigned long ticks)
1191{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001192 struct snd_timer_user *tu = timeri->callback_data;
1193 struct snd_timer_tread *r, r1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 struct timespec tstamp;
1195 int prev, append = 0;
1196
Takashi Iwai07799e72005-10-10 11:49:49 +02001197 memset(&tstamp, 0, sizeof(tstamp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 spin_lock(&tu->qlock);
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001199 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1200 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 spin_unlock(&tu->qlock);
1202 return;
1203 }
Jaroslav Kyselab751eef2007-12-13 10:19:42 +01001204 if (tu->last_resolution != resolution || ticks > 0) {
1205 if (timer_tstamp_monotonic)
Thomas Gleixner26204e02014-06-11 23:59:14 +00001206 ktime_get_ts(&tstamp);
Jaroslav Kyselab751eef2007-12-13 10:19:42 +01001207 else
1208 getnstimeofday(&tstamp);
1209 }
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001210 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1211 tu->last_resolution != resolution) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1213 r1.tstamp = tstamp;
1214 r1.val = resolution;
1215 snd_timer_user_append_to_tqueue(tu, &r1);
1216 tu->last_resolution = resolution;
1217 append++;
1218 }
1219 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1220 goto __wake;
1221 if (ticks == 0)
1222 goto __wake;
1223 if (tu->qused > 0) {
1224 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1225 r = &tu->tqueue[prev];
1226 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1227 r->tstamp = tstamp;
1228 r->val += ticks;
1229 append++;
1230 goto __wake;
1231 }
1232 }
1233 r1.event = SNDRV_TIMER_EVENT_TICK;
1234 r1.tstamp = tstamp;
1235 r1.val = ticks;
1236 snd_timer_user_append_to_tqueue(tu, &r1);
1237 append++;
1238 __wake:
1239 spin_unlock(&tu->qlock);
1240 if (append == 0)
1241 return;
1242 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1243 wake_up(&tu->qchange_sleep);
1244}
1245
1246static int snd_timer_user_open(struct inode *inode, struct file *file)
1247{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001248 struct snd_timer_user *tu;
Takashi Iwai02f48652010-04-13 11:49:04 +02001249 int err;
1250
1251 err = nonseekable_open(inode, file);
1252 if (err < 0)
1253 return err;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001254
Takashi Iwaica2c0962005-09-09 14:20:23 +02001255 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 if (tu == NULL)
1257 return -ENOMEM;
1258 spin_lock_init(&tu->qlock);
1259 init_waitqueue_head(&tu->qchange_sleep);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001260 mutex_init(&tu->tread_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 tu->ticks = 1;
1262 tu->queue_size = 128;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001263 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001264 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 if (tu->queue == NULL) {
1266 kfree(tu);
1267 return -ENOMEM;
1268 }
1269 file->private_data = tu;
1270 return 0;
1271}
1272
1273static int snd_timer_user_release(struct inode *inode, struct file *file)
1274{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001275 struct snd_timer_user *tu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276
1277 if (file->private_data) {
1278 tu = file->private_data;
1279 file->private_data = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 if (tu->timeri)
1281 snd_timer_close(tu->timeri);
1282 kfree(tu->queue);
1283 kfree(tu->tqueue);
1284 kfree(tu);
1285 }
1286 return 0;
1287}
1288
Takashi Iwai53d2f742005-11-17 13:56:05 +01001289static void snd_timer_user_zero_id(struct snd_timer_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290{
1291 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1292 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1293 id->card = -1;
1294 id->device = -1;
1295 id->subdevice = -1;
1296}
1297
Takashi Iwai53d2f742005-11-17 13:56:05 +01001298static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299{
1300 id->dev_class = timer->tmr_class;
1301 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1302 id->card = timer->card ? timer->card->number : -1;
1303 id->device = timer->tmr_device;
1304 id->subdevice = timer->tmr_subdevice;
1305}
1306
Takashi Iwai53d2f742005-11-17 13:56:05 +01001307static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001309 struct snd_timer_id id;
1310 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 struct list_head *p;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001312
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313 if (copy_from_user(&id, _tid, sizeof(id)))
1314 return -EFAULT;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001315 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 if (id.dev_class < 0) { /* first item */
1317 if (list_empty(&snd_timer_list))
1318 snd_timer_user_zero_id(&id);
1319 else {
Clemens Ladisch9dfba382005-10-12 17:14:55 +02001320 timer = list_entry(snd_timer_list.next,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001321 struct snd_timer, device_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 snd_timer_user_copy_id(&id, timer);
1323 }
1324 } else {
1325 switch (id.dev_class) {
1326 case SNDRV_TIMER_CLASS_GLOBAL:
1327 id.device = id.device < 0 ? 0 : id.device + 1;
1328 list_for_each(p, &snd_timer_list) {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001329 timer = list_entry(p, struct snd_timer, device_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1331 snd_timer_user_copy_id(&id, timer);
1332 break;
1333 }
1334 if (timer->tmr_device >= id.device) {
1335 snd_timer_user_copy_id(&id, timer);
1336 break;
1337 }
1338 }
1339 if (p == &snd_timer_list)
1340 snd_timer_user_zero_id(&id);
1341 break;
1342 case SNDRV_TIMER_CLASS_CARD:
1343 case SNDRV_TIMER_CLASS_PCM:
1344 if (id.card < 0) {
1345 id.card = 0;
1346 } else {
1347 if (id.card < 0) {
1348 id.card = 0;
1349 } else {
1350 if (id.device < 0) {
1351 id.device = 0;
1352 } else {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001353 if (id.subdevice < 0) {
1354 id.subdevice = 0;
1355 } else {
1356 id.subdevice++;
1357 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 }
1359 }
1360 }
1361 list_for_each(p, &snd_timer_list) {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001362 timer = list_entry(p, struct snd_timer, device_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 if (timer->tmr_class > id.dev_class) {
1364 snd_timer_user_copy_id(&id, timer);
1365 break;
1366 }
1367 if (timer->tmr_class < id.dev_class)
1368 continue;
1369 if (timer->card->number > id.card) {
1370 snd_timer_user_copy_id(&id, timer);
1371 break;
1372 }
1373 if (timer->card->number < id.card)
1374 continue;
1375 if (timer->tmr_device > id.device) {
1376 snd_timer_user_copy_id(&id, timer);
1377 break;
1378 }
1379 if (timer->tmr_device < id.device)
1380 continue;
1381 if (timer->tmr_subdevice > id.subdevice) {
1382 snd_timer_user_copy_id(&id, timer);
1383 break;
1384 }
1385 if (timer->tmr_subdevice < id.subdevice)
1386 continue;
1387 snd_timer_user_copy_id(&id, timer);
1388 break;
1389 }
1390 if (p == &snd_timer_list)
1391 snd_timer_user_zero_id(&id);
1392 break;
1393 default:
1394 snd_timer_user_zero_id(&id);
1395 }
1396 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001397 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1399 return -EFAULT;
1400 return 0;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001401}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001403static int snd_timer_user_ginfo(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001404 struct snd_timer_ginfo __user *_ginfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001406 struct snd_timer_ginfo *ginfo;
1407 struct snd_timer_id tid;
1408 struct snd_timer *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 struct list_head *p;
1410 int err = 0;
1411
Li Zefanef44a1e2009-04-10 09:43:08 +08001412 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1413 if (IS_ERR(ginfo))
1414 return PTR_ERR(ginfo);
1415
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 tid = ginfo->tid;
1417 memset(ginfo, 0, sizeof(*ginfo));
1418 ginfo->tid = tid;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001419 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 t = snd_timer_find(&tid);
1421 if (t != NULL) {
1422 ginfo->card = t->card ? t->card->number : -1;
1423 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1424 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1425 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1426 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1427 ginfo->resolution = t->hw.resolution;
1428 if (t->hw.resolution_min > 0) {
1429 ginfo->resolution_min = t->hw.resolution_min;
1430 ginfo->resolution_max = t->hw.resolution_max;
1431 }
1432 list_for_each(p, &t->open_list_head) {
1433 ginfo->clients++;
1434 }
1435 } else {
1436 err = -ENODEV;
1437 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001438 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1440 err = -EFAULT;
1441 kfree(ginfo);
1442 return err;
1443}
1444
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001445static int snd_timer_user_gparams(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001446 struct snd_timer_gparams __user *_gparams)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001448 struct snd_timer_gparams gparams;
1449 struct snd_timer *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450 int err;
1451
1452 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1453 return -EFAULT;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001454 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455 t = snd_timer_find(&gparams.tid);
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001456 if (!t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 err = -ENODEV;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001458 goto _error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459 }
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001460 if (!list_empty(&t->open_list_head)) {
1461 err = -EBUSY;
1462 goto _error;
1463 }
1464 if (!t->hw.set_period) {
1465 err = -ENOSYS;
1466 goto _error;
1467 }
1468 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1469_error:
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001470 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 return err;
1472}
1473
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001474static int snd_timer_user_gstatus(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001475 struct snd_timer_gstatus __user *_gstatus)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001477 struct snd_timer_gstatus gstatus;
1478 struct snd_timer_id tid;
1479 struct snd_timer *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 int err = 0;
1481
1482 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1483 return -EFAULT;
1484 tid = gstatus.tid;
1485 memset(&gstatus, 0, sizeof(gstatus));
1486 gstatus.tid = tid;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001487 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 t = snd_timer_find(&tid);
1489 if (t != NULL) {
1490 if (t->hw.c_resolution)
1491 gstatus.resolution = t->hw.c_resolution(t);
1492 else
1493 gstatus.resolution = t->hw.resolution;
1494 if (t->hw.precise_resolution) {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001495 t->hw.precise_resolution(t, &gstatus.resolution_num,
1496 &gstatus.resolution_den);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497 } else {
1498 gstatus.resolution_num = gstatus.resolution;
1499 gstatus.resolution_den = 1000000000uL;
1500 }
1501 } else {
1502 err = -ENODEV;
1503 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001504 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1506 err = -EFAULT;
1507 return err;
1508}
1509
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001510static int snd_timer_user_tselect(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001511 struct snd_timer_select __user *_tselect)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001513 struct snd_timer_user *tu;
1514 struct snd_timer_select tselect;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515 char str[32];
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001516 int err = 0;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001517
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518 tu = file->private_data;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001519 mutex_lock(&tu->tread_sem);
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001520 if (tu->timeri) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 snd_timer_close(tu->timeri);
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001522 tu->timeri = NULL;
1523 }
1524 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1525 err = -EFAULT;
1526 goto __err;
1527 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528 sprintf(str, "application %i", current->pid);
1529 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1530 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001531 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1532 if (err < 0)
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001533 goto __err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534
Jesper Juhl4d572772005-05-30 17:30:32 +02001535 kfree(tu->queue);
1536 tu->queue = NULL;
1537 kfree(tu->tqueue);
1538 tu->tqueue = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 if (tu->tread) {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001540 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001541 GFP_KERNEL);
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001542 if (tu->tqueue == NULL)
1543 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544 } else {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001545 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001546 GFP_KERNEL);
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001547 if (tu->queue == NULL)
1548 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 }
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001550
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001551 if (err < 0) {
1552 snd_timer_close(tu->timeri);
1553 tu->timeri = NULL;
1554 } else {
1555 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001556 tu->timeri->callback = tu->tread
1557 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001558 tu->timeri->ccallback = snd_timer_user_ccallback;
1559 tu->timeri->callback_data = (void *)tu;
1560 }
1561
1562 __err:
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001563 mutex_unlock(&tu->tread_sem);
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001564 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565}
1566
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001567static int snd_timer_user_info(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001568 struct snd_timer_info __user *_info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001570 struct snd_timer_user *tu;
1571 struct snd_timer_info *info;
1572 struct snd_timer *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 int err = 0;
1574
1575 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001576 if (!tu->timeri)
1577 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578 t = tu->timeri->timer;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001579 if (!t)
1580 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581
Takashi Iwaica2c0962005-09-09 14:20:23 +02001582 info = kzalloc(sizeof(*info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583 if (! info)
1584 return -ENOMEM;
1585 info->card = t->card ? t->card->number : -1;
1586 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1587 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1588 strlcpy(info->id, t->id, sizeof(info->id));
1589 strlcpy(info->name, t->name, sizeof(info->name));
1590 info->resolution = t->hw.resolution;
1591 if (copy_to_user(_info, info, sizeof(*_info)))
1592 err = -EFAULT;
1593 kfree(info);
1594 return err;
1595}
1596
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001597static int snd_timer_user_params(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001598 struct snd_timer_params __user *_params)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001600 struct snd_timer_user *tu;
1601 struct snd_timer_params params;
1602 struct snd_timer *t;
1603 struct snd_timer_read *tr;
1604 struct snd_timer_tread *ttr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 int err;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001606
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001608 if (!tu->timeri)
1609 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 t = tu->timeri->timer;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001611 if (!t)
1612 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613 if (copy_from_user(&params, _params, sizeof(params)))
1614 return -EFAULT;
1615 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1616 err = -EINVAL;
1617 goto _end;
1618 }
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001619 if (params.queue_size > 0 &&
1620 (params.queue_size < 32 || params.queue_size > 1024)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621 err = -EINVAL;
1622 goto _end;
1623 }
1624 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1625 (1<<SNDRV_TIMER_EVENT_TICK)|
1626 (1<<SNDRV_TIMER_EVENT_START)|
1627 (1<<SNDRV_TIMER_EVENT_STOP)|
1628 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1629 (1<<SNDRV_TIMER_EVENT_PAUSE)|
Jaroslav Kyselaa501dfa2005-08-16 11:09:05 +02001630 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1631 (1<<SNDRV_TIMER_EVENT_RESUME)|
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632 (1<<SNDRV_TIMER_EVENT_MSTART)|
1633 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1634 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
Jaroslav Kysela65d11d92005-08-16 13:05:43 +02001635 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1636 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
Jaroslav Kyselaa501dfa2005-08-16 11:09:05 +02001637 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638 err = -EINVAL;
1639 goto _end;
1640 }
1641 snd_timer_stop(tu->timeri);
1642 spin_lock_irq(&t->lock);
1643 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1644 SNDRV_TIMER_IFLG_EXCLUSIVE|
1645 SNDRV_TIMER_IFLG_EARLY_EVENT);
1646 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1647 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1648 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1649 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1650 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1651 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1652 spin_unlock_irq(&t->lock);
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001653 if (params.queue_size > 0 &&
1654 (unsigned int)tu->queue_size != params.queue_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655 if (tu->tread) {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001656 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1657 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 if (ttr) {
1659 kfree(tu->tqueue);
1660 tu->queue_size = params.queue_size;
1661 tu->tqueue = ttr;
1662 }
1663 } else {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001664 tr = kmalloc(params.queue_size * sizeof(*tr),
1665 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 if (tr) {
1667 kfree(tu->queue);
1668 tu->queue_size = params.queue_size;
1669 tu->queue = tr;
1670 }
1671 }
1672 }
1673 tu->qhead = tu->qtail = tu->qused = 0;
1674 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1675 if (tu->tread) {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001676 struct snd_timer_tread tread;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677 tread.event = SNDRV_TIMER_EVENT_EARLY;
1678 tread.tstamp.tv_sec = 0;
1679 tread.tstamp.tv_nsec = 0;
1680 tread.val = 0;
1681 snd_timer_user_append_to_tqueue(tu, &tread);
1682 } else {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001683 struct snd_timer_read *r = &tu->queue[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 r->resolution = 0;
1685 r->ticks = 0;
1686 tu->qused++;
1687 tu->qtail++;
1688 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689 }
1690 tu->filter = params.filter;
1691 tu->ticks = params.ticks;
1692 err = 0;
1693 _end:
1694 if (copy_to_user(_params, &params, sizeof(params)))
1695 return -EFAULT;
1696 return err;
1697}
1698
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001699static int snd_timer_user_status(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001700 struct snd_timer_status __user *_status)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001702 struct snd_timer_user *tu;
1703 struct snd_timer_status status;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001704
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001706 if (!tu->timeri)
1707 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708 memset(&status, 0, sizeof(status));
1709 status.tstamp = tu->tstamp;
1710 status.resolution = snd_timer_resolution(tu->timeri);
1711 status.lost = tu->timeri->lost;
1712 status.overrun = tu->overrun;
1713 spin_lock_irq(&tu->qlock);
1714 status.queue = tu->qused;
1715 spin_unlock_irq(&tu->qlock);
1716 if (copy_to_user(_status, &status, sizeof(status)))
1717 return -EFAULT;
1718 return 0;
1719}
1720
1721static int snd_timer_user_start(struct file *file)
1722{
1723 int err;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001724 struct snd_timer_user *tu;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001725
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001727 if (!tu->timeri)
1728 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729 snd_timer_stop(tu->timeri);
1730 tu->timeri->lost = 0;
1731 tu->last_resolution = 0;
1732 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1733}
1734
1735static int snd_timer_user_stop(struct file *file)
1736{
1737 int err;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001738 struct snd_timer_user *tu;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001739
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001741 if (!tu->timeri)
1742 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1744}
1745
1746static int snd_timer_user_continue(struct file *file)
1747{
1748 int err;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001749 struct snd_timer_user *tu;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001750
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001752 if (!tu->timeri)
1753 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 tu->timeri->lost = 0;
1755 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1756}
1757
Takashi Iwai15790a62005-05-15 15:04:14 +02001758static int snd_timer_user_pause(struct file *file)
1759{
1760 int err;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001761 struct snd_timer_user *tu;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001762
Takashi Iwai15790a62005-05-15 15:04:14 +02001763 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001764 if (!tu->timeri)
1765 return -EBADFD;
Jaroslav Kyselad138b442005-05-16 13:51:39 +02001766 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
Takashi Iwai15790a62005-05-15 15:04:14 +02001767}
1768
Takashi Iwai8c50b372005-05-15 15:43:54 +02001769enum {
1770 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1771 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1772 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1773 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1774};
1775
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001776static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1777 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001779 struct snd_timer_user *tu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780 void __user *argp = (void __user *)arg;
1781 int __user *p = argp;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001782
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783 tu = file->private_data;
1784 switch (cmd) {
1785 case SNDRV_TIMER_IOCTL_PVERSION:
1786 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1787 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1788 return snd_timer_user_next_device(argp);
1789 case SNDRV_TIMER_IOCTL_TREAD:
1790 {
1791 int xarg;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001792
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001793 mutex_lock(&tu->tread_sem);
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001794 if (tu->timeri) { /* too late */
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001795 mutex_unlock(&tu->tread_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796 return -EBUSY;
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001797 }
1798 if (get_user(xarg, p)) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001799 mutex_unlock(&tu->tread_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 return -EFAULT;
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001801 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802 tu->tread = xarg ? 1 : 0;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001803 mutex_unlock(&tu->tread_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 return 0;
1805 }
1806 case SNDRV_TIMER_IOCTL_GINFO:
1807 return snd_timer_user_ginfo(file, argp);
1808 case SNDRV_TIMER_IOCTL_GPARAMS:
1809 return snd_timer_user_gparams(file, argp);
1810 case SNDRV_TIMER_IOCTL_GSTATUS:
1811 return snd_timer_user_gstatus(file, argp);
1812 case SNDRV_TIMER_IOCTL_SELECT:
1813 return snd_timer_user_tselect(file, argp);
1814 case SNDRV_TIMER_IOCTL_INFO:
1815 return snd_timer_user_info(file, argp);
1816 case SNDRV_TIMER_IOCTL_PARAMS:
1817 return snd_timer_user_params(file, argp);
1818 case SNDRV_TIMER_IOCTL_STATUS:
1819 return snd_timer_user_status(file, argp);
1820 case SNDRV_TIMER_IOCTL_START:
Takashi Iwai8c50b372005-05-15 15:43:54 +02001821 case SNDRV_TIMER_IOCTL_START_OLD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 return snd_timer_user_start(file);
1823 case SNDRV_TIMER_IOCTL_STOP:
Takashi Iwai8c50b372005-05-15 15:43:54 +02001824 case SNDRV_TIMER_IOCTL_STOP_OLD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825 return snd_timer_user_stop(file);
1826 case SNDRV_TIMER_IOCTL_CONTINUE:
Takashi Iwai8c50b372005-05-15 15:43:54 +02001827 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828 return snd_timer_user_continue(file);
Takashi Iwai15790a62005-05-15 15:04:14 +02001829 case SNDRV_TIMER_IOCTL_PAUSE:
Takashi Iwai8c50b372005-05-15 15:43:54 +02001830 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
Takashi Iwai15790a62005-05-15 15:04:14 +02001831 return snd_timer_user_pause(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832 }
1833 return -ENOTTY;
1834}
1835
1836static int snd_timer_user_fasync(int fd, struct file * file, int on)
1837{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001838 struct snd_timer_user *tu;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001839
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840 tu = file->private_data;
Jonathan Corbet60aa4922009-02-01 14:52:56 -07001841 return fasync_helper(fd, file, on, &tu->fasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842}
1843
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001844static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1845 size_t count, loff_t *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001847 struct snd_timer_user *tu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848 long result = 0, unit;
1849 int err = 0;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001850
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 tu = file->private_data;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001852 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853 spin_lock_irq(&tu->qlock);
1854 while ((long)count - result >= unit) {
1855 while (!tu->qused) {
1856 wait_queue_t wait;
1857
1858 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1859 err = -EAGAIN;
1860 break;
1861 }
1862
1863 set_current_state(TASK_INTERRUPTIBLE);
1864 init_waitqueue_entry(&wait, current);
1865 add_wait_queue(&tu->qchange_sleep, &wait);
1866
1867 spin_unlock_irq(&tu->qlock);
1868 schedule();
1869 spin_lock_irq(&tu->qlock);
1870
1871 remove_wait_queue(&tu->qchange_sleep, &wait);
1872
1873 if (signal_pending(current)) {
1874 err = -ERESTARTSYS;
1875 break;
1876 }
1877 }
1878
1879 spin_unlock_irq(&tu->qlock);
1880 if (err < 0)
1881 goto _error;
1882
1883 if (tu->tread) {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001884 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
Takashi Iwai53d2f742005-11-17 13:56:05 +01001885 sizeof(struct snd_timer_tread))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001886 err = -EFAULT;
1887 goto _error;
1888 }
1889 } else {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001890 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
Takashi Iwai53d2f742005-11-17 13:56:05 +01001891 sizeof(struct snd_timer_read))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 err = -EFAULT;
1893 goto _error;
1894 }
1895 }
1896
1897 tu->qhead %= tu->queue_size;
1898
1899 result += unit;
1900 buffer += unit;
1901
1902 spin_lock_irq(&tu->qlock);
1903 tu->qused--;
1904 }
1905 spin_unlock_irq(&tu->qlock);
1906 _error:
1907 return result > 0 ? result : err;
1908}
1909
1910static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1911{
1912 unsigned int mask;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001913 struct snd_timer_user *tu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914
1915 tu = file->private_data;
1916
1917 poll_wait(file, &tu->qchange_sleep, wait);
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001918
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919 mask = 0;
1920 if (tu->qused)
1921 mask |= POLLIN | POLLRDNORM;
1922
1923 return mask;
1924}
1925
1926#ifdef CONFIG_COMPAT
1927#include "timer_compat.c"
1928#else
1929#define snd_timer_user_ioctl_compat NULL
1930#endif
1931
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001932static const struct file_operations snd_timer_f_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933{
1934 .owner = THIS_MODULE,
1935 .read = snd_timer_user_read,
1936 .open = snd_timer_user_open,
1937 .release = snd_timer_user_release,
Takashi Iwai02f48652010-04-13 11:49:04 +02001938 .llseek = no_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939 .poll = snd_timer_user_poll,
1940 .unlocked_ioctl = snd_timer_user_ioctl,
1941 .compat_ioctl = snd_timer_user_ioctl_compat,
1942 .fasync = snd_timer_user_fasync,
1943};
1944
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945/*
1946 * ENTRY functions
1947 */
1948
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949static int __init alsa_timer_init(void)
1950{
1951 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952
1953#ifdef SNDRV_OSS_INFO_DEV_TIMERS
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001954 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1955 "system timer");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956#endif
Takashi Iwaie28563c2005-12-01 10:42:42 +01001957
Linus Torvalds1da177e2005-04-16 15:20:36 -07001958 if ((err = snd_timer_register_system()) < 0)
Takashi Iwaicf74dcf2014-02-04 18:22:39 +01001959 pr_err("ALSA: unable to register system timer (%i)\n", err);
Clemens Ladischf87135f2005-11-20 14:06:59 +01001960 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1961 &snd_timer_f_ops, NULL, "timer")) < 0)
Takashi Iwaicf74dcf2014-02-04 18:22:39 +01001962 pr_err("ALSA: unable to register timer device (%i)\n", err);
Takashi Iwaie28563c2005-12-01 10:42:42 +01001963 snd_timer_proc_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001964 return 0;
1965}
1966
1967static void __exit alsa_timer_exit(void)
1968{
1969 struct list_head *p, *n;
1970
1971 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
1972 /* unregister the system timer */
1973 list_for_each_safe(p, n, &snd_timer_list) {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001974 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list);
Takashi Iwaic4614822006-06-23 14:38:23 +02001975 snd_timer_free(timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976 }
Takashi Iwaie28563c2005-12-01 10:42:42 +01001977 snd_timer_proc_done();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978#ifdef SNDRV_OSS_INFO_DEV_TIMERS
1979 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1);
1980#endif
1981}
1982
1983module_init(alsa_timer_init)
1984module_exit(alsa_timer_exit)
1985
1986EXPORT_SYMBOL(snd_timer_open);
1987EXPORT_SYMBOL(snd_timer_close);
1988EXPORT_SYMBOL(snd_timer_resolution);
1989EXPORT_SYMBOL(snd_timer_start);
1990EXPORT_SYMBOL(snd_timer_stop);
1991EXPORT_SYMBOL(snd_timer_continue);
1992EXPORT_SYMBOL(snd_timer_pause);
1993EXPORT_SYMBOL(snd_timer_new);
1994EXPORT_SYMBOL(snd_timer_notify);
1995EXPORT_SYMBOL(snd_timer_global_new);
1996EXPORT_SYMBOL(snd_timer_global_free);
1997EXPORT_SYMBOL(snd_timer_global_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998EXPORT_SYMBOL(snd_timer_interrupt);