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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/moduleparam.h>
Paulo Marques543537b2005-06-23 00:09:02 -070028#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <sound/core.h>
30#include <sound/timer.h>
31#include <sound/control.h>
32#include <sound/info.h>
33#include <sound/minors.h>
34#include <sound/initval.h>
35#include <linux/kmod.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Clemens Ladisch109fef92010-11-18 09:53:54 +010037#if defined(CONFIG_SND_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE)
38#define DEFAULT_TIMER_LIMIT 4
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE)
40#define DEFAULT_TIMER_LIMIT 2
41#else
42#define DEFAULT_TIMER_LIMIT 1
43#endif
44
45static int timer_limit = DEFAULT_TIMER_LIMIT;
Jaroslav Kyselab751eef2007-12-13 10:19:42 +010046static int timer_tstamp_monotonic = 1;
Jaroslav Kyselac1017a42007-10-15 09:50:19 +020047MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
Linus Torvalds1da177e2005-04-16 15:20:36 -070048MODULE_DESCRIPTION("ALSA timer interface");
49MODULE_LICENSE("GPL");
50module_param(timer_limit, int, 0444);
51MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
Jaroslav Kyselab751eef2007-12-13 10:19:42 +010052module_param(timer_tstamp_monotonic, int, 0444);
53MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Kay Sievers03cfe6f2010-11-23 17:43:19 +010055MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER);
56MODULE_ALIAS("devname:snd/timer");
57
Takashi Iwai53d2f742005-11-17 13:56:05 +010058struct snd_timer_user {
59 struct snd_timer_instance *timeri;
Clemens Ladisch6b172a82005-10-12 17:20:21 +020060 int tread; /* enhanced read with timestamps and events */
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 unsigned long ticks;
62 unsigned long overrun;
63 int qhead;
64 int qtail;
65 int qused;
66 int queue_size;
Takashi Iwai53d2f742005-11-17 13:56:05 +010067 struct snd_timer_read *queue;
68 struct snd_timer_tread *tqueue;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 spinlock_t qlock;
70 unsigned long last_resolution;
71 unsigned int filter;
72 struct timespec tstamp; /* trigger tstamp */
73 wait_queue_head_t qchange_sleep;
74 struct fasync_struct *fasync;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010075 struct mutex tread_sem;
Takashi Iwai53d2f742005-11-17 13:56:05 +010076};
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78/* list of timers */
79static LIST_HEAD(snd_timer_list);
80
81/* list of slave instances */
82static LIST_HEAD(snd_timer_slave_list);
83
84/* lock for slave active lists */
85static DEFINE_SPINLOCK(slave_active_lock);
86
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010087static DEFINE_MUTEX(register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Takashi Iwai53d2f742005-11-17 13:56:05 +010089static int snd_timer_free(struct snd_timer *timer);
90static int snd_timer_dev_free(struct snd_device *device);
91static int snd_timer_dev_register(struct snd_device *device);
Takashi Iwaic4614822006-06-23 14:38:23 +020092static int snd_timer_dev_disconnect(struct snd_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Takashi Iwai53d2f742005-11-17 13:56:05 +010094static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96/*
97 * create a timer instance with the given owner string.
98 * when timer is not NULL, increments the module counter
99 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100100static struct snd_timer_instance *snd_timer_instance_new(char *owner,
101 struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100103 struct snd_timer_instance *timeri;
Takashi Iwaica2c0962005-09-09 14:20:23 +0200104 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 if (timeri == NULL)
106 return NULL;
Paulo Marques543537b2005-06-23 00:09:02 -0700107 timeri->owner = kstrdup(owner, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 if (! timeri->owner) {
109 kfree(timeri);
110 return NULL;
111 }
112 INIT_LIST_HEAD(&timeri->open_list);
113 INIT_LIST_HEAD(&timeri->active_list);
114 INIT_LIST_HEAD(&timeri->ack_list);
115 INIT_LIST_HEAD(&timeri->slave_list_head);
116 INIT_LIST_HEAD(&timeri->slave_active_head);
117
118 timeri->timer = timer;
Clemens Ladischde242142005-10-12 17:12:31 +0200119 if (timer && !try_module_get(timer->module)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 kfree(timeri->owner);
121 kfree(timeri);
122 return NULL;
123 }
124
125 return timeri;
126}
127
128/*
129 * find a timer instance from the given timer id
130 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100131static struct snd_timer *snd_timer_find(struct snd_timer_id *tid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100133 struct snd_timer *timer = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Johannes Berg9244b2c2006-10-05 16:02:22 +0200135 list_for_each_entry(timer, &snd_timer_list, device_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 if (timer->tmr_class != tid->dev_class)
137 continue;
138 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD ||
139 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) &&
140 (timer->card == NULL ||
141 timer->card->number != tid->card))
142 continue;
143 if (timer->tmr_device != tid->device)
144 continue;
145 if (timer->tmr_subdevice != tid->subdevice)
146 continue;
147 return timer;
148 }
149 return NULL;
150}
151
Johannes Bergee2da992008-07-09 10:28:41 +0200152#ifdef CONFIG_MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Takashi Iwai53d2f742005-11-17 13:56:05 +0100154static void snd_timer_request(struct snd_timer_id *tid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 switch (tid->dev_class) {
157 case SNDRV_TIMER_CLASS_GLOBAL:
158 if (tid->device < timer_limit)
159 request_module("snd-timer-%i", tid->device);
160 break;
161 case SNDRV_TIMER_CLASS_CARD:
162 case SNDRV_TIMER_CLASS_PCM:
163 if (tid->card < snd_ecards_limit)
164 request_module("snd-card-%i", tid->card);
165 break;
166 default:
167 break;
168 }
169}
170
171#endif
172
173/*
174 * look for a master instance matching with the slave id of the given slave.
175 * when found, relink the open_link of the slave.
176 *
177 * call this with register_mutex down.
178 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100179static void snd_timer_check_slave(struct snd_timer_instance *slave)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100181 struct snd_timer *timer;
182 struct snd_timer_instance *master;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
184 /* FIXME: it's really dumb to look up all entries.. */
Johannes Berg9244b2c2006-10-05 16:02:22 +0200185 list_for_each_entry(timer, &snd_timer_list, device_list) {
186 list_for_each_entry(master, &timer->open_list_head, open_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 if (slave->slave_class == master->slave_class &&
188 slave->slave_id == master->slave_id) {
Nicolas Kaiser5b7c7572011-03-16 17:10:11 +0100189 list_move_tail(&slave->open_list,
190 &master->slave_list_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 spin_lock_irq(&slave_active_lock);
192 slave->master = master;
193 slave->timer = master->timer;
194 spin_unlock_irq(&slave_active_lock);
195 return;
196 }
197 }
198 }
199}
200
201/*
202 * look for slave instances matching with the slave id of the given master.
203 * when found, relink the open_link of slaves.
204 *
205 * call this with register_mutex down.
206 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100207static void snd_timer_check_master(struct snd_timer_instance *master)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
Johannes Berg9244b2c2006-10-05 16:02:22 +0200209 struct snd_timer_instance *slave, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
211 /* check all pending slaves */
Johannes Berg9244b2c2006-10-05 16:02:22 +0200212 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 if (slave->slave_class == master->slave_class &&
214 slave->slave_id == master->slave_id) {
Johannes Berg9244b2c2006-10-05 16:02:22 +0200215 list_move_tail(&slave->open_list, &master->slave_list_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 spin_lock_irq(&slave_active_lock);
217 slave->master = master;
218 slave->timer = master->timer;
219 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200220 list_add_tail(&slave->active_list,
221 &master->slave_active_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 spin_unlock_irq(&slave_active_lock);
223 }
224 }
225}
226
227/*
228 * open a timer instance
229 * when opening a master, the slave id must be here given.
230 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100231int snd_timer_open(struct snd_timer_instance **ti,
232 char *owner, struct snd_timer_id *tid,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 unsigned int slave_id)
234{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100235 struct snd_timer *timer;
236 struct snd_timer_instance *timeri = NULL;
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200237
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) {
239 /* open a slave instance */
240 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE ||
241 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) {
242 snd_printd("invalid slave class %i\n", tid->dev_sclass);
243 return -EINVAL;
244 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100245 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 timeri = snd_timer_instance_new(owner, NULL);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200247 if (!timeri) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100248 mutex_unlock(&register_mutex);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200249 return -ENOMEM;
250 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 timeri->slave_class = tid->dev_sclass;
252 timeri->slave_id = tid->device;
253 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE;
254 list_add_tail(&timeri->open_list, &snd_timer_slave_list);
255 snd_timer_check_slave(timeri);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100256 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 *ti = timeri;
258 return 0;
259 }
260
261 /* open a master instance */
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100262 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 timer = snd_timer_find(tid);
Johannes Bergee2da992008-07-09 10:28:41 +0200264#ifdef CONFIG_MODULES
265 if (!timer) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100266 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 snd_timer_request(tid);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100268 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 timer = snd_timer_find(tid);
270 }
271#endif
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200272 if (!timer) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100273 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 return -ENODEV;
275 }
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200276 if (!list_empty(&timer->open_list_head)) {
277 timeri = list_entry(timer->open_list_head.next,
Takashi Iwai53d2f742005-11-17 13:56:05 +0100278 struct snd_timer_instance, open_list);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200279 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100280 mutex_unlock(&register_mutex);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200281 return -EBUSY;
282 }
283 }
284 timeri = snd_timer_instance_new(owner, timer);
285 if (!timeri) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100286 mutex_unlock(&register_mutex);
Clemens Ladisch2fd43d12005-10-12 17:10:35 +0200287 return -ENOMEM;
288 }
289 timeri->slave_class = tid->dev_sclass;
290 timeri->slave_id = slave_id;
291 if (list_empty(&timer->open_list_head) && timer->hw.open)
292 timer->hw.open(timer);
293 list_add_tail(&timeri->open_list, &timer->open_list_head);
294 snd_timer_check_master(timeri);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100295 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 *ti = timeri;
297 return 0;
298}
299
Takashi Iwai53d2f742005-11-17 13:56:05 +0100300static int _snd_timer_stop(struct snd_timer_instance *timeri,
301 int keep_flag, int event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
303/*
304 * close a timer instance
305 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100306int snd_timer_close(struct snd_timer_instance *timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100308 struct snd_timer *timer = NULL;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200309 struct snd_timer_instance *slave, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Takashi Iwai00728892008-08-14 07:51:57 +0200311 if (snd_BUG_ON(!timeri))
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200312 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
314 /* force to stop the timer */
315 snd_timer_stop(timeri);
316
317 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
318 /* wait, until the active callback is finished */
319 spin_lock_irq(&slave_active_lock);
320 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
321 spin_unlock_irq(&slave_active_lock);
322 udelay(10);
323 spin_lock_irq(&slave_active_lock);
324 }
325 spin_unlock_irq(&slave_active_lock);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100326 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 list_del(&timeri->open_list);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100328 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 } else {
330 timer = timeri->timer;
Takashi Iwai94094c82011-08-08 12:28:22 +0200331 if (snd_BUG_ON(!timer))
332 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 /* wait, until the active callback is finished */
334 spin_lock_irq(&timer->lock);
335 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
336 spin_unlock_irq(&timer->lock);
337 udelay(10);
338 spin_lock_irq(&timer->lock);
339 }
340 spin_unlock_irq(&timer->lock);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100341 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 list_del(&timeri->open_list);
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200343 if (timer && list_empty(&timer->open_list_head) &&
344 timer->hw.close)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 timer->hw.close(timer);
346 /* remove slave links */
Johannes Berg9244b2c2006-10-05 16:02:22 +0200347 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
348 open_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 spin_lock_irq(&slave_active_lock);
350 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200351 list_move_tail(&slave->open_list, &snd_timer_slave_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 slave->master = NULL;
353 slave->timer = NULL;
354 spin_unlock_irq(&slave_active_lock);
355 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100356 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 }
Takashi Iwai94094c82011-08-08 12:28:22 +0200358 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 if (timeri->private_free)
360 timeri->private_free(timeri);
361 kfree(timeri->owner);
362 kfree(timeri);
Clemens Ladischde242142005-10-12 17:12:31 +0200363 if (timer)
364 module_put(timer->module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 return 0;
366}
367
Takashi Iwai53d2f742005-11-17 13:56:05 +0100368unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100370 struct snd_timer * timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
372 if (timeri == NULL)
373 return 0;
374 if ((timer = timeri->timer) != NULL) {
375 if (timer->hw.c_resolution)
376 return timer->hw.c_resolution(timer);
377 return timer->hw.resolution;
378 }
379 return 0;
380}
381
Takashi Iwai53d2f742005-11-17 13:56:05 +0100382static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100384 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 unsigned long flags;
386 unsigned long resolution = 0;
Takashi Iwai53d2f742005-11-17 13:56:05 +0100387 struct snd_timer_instance *ts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 struct timespec tstamp;
389
Jaroslav Kyselab751eef2007-12-13 10:19:42 +0100390 if (timer_tstamp_monotonic)
391 do_posix_clock_monotonic_gettime(&tstamp);
392 else
393 getnstimeofday(&tstamp);
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200394 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START ||
395 event > SNDRV_TIMER_EVENT_PAUSE))
396 return;
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200397 if (event == SNDRV_TIMER_EVENT_START ||
398 event == SNDRV_TIMER_EVENT_CONTINUE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 resolution = snd_timer_resolution(ti);
400 if (ti->ccallback)
Jaroslav Kyselab30477d2010-03-03 11:05:55 +0100401 ti->ccallback(ti, event, &tstamp, resolution);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE)
403 return;
404 timer = ti->timer;
405 if (timer == NULL)
406 return;
407 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
408 return;
409 spin_lock_irqsave(&timer->lock, flags);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200410 list_for_each_entry(ts, &ti->slave_active_head, active_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 if (ts->ccallback)
412 ts->ccallback(ti, event + 100, &tstamp, resolution);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 spin_unlock_irqrestore(&timer->lock, flags);
414}
415
Takashi Iwai53d2f742005-11-17 13:56:05 +0100416static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri,
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200417 unsigned long sticks)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418{
Nicolas Kaiser5b7c7572011-03-16 17:10:11 +0100419 list_move_tail(&timeri->active_list, &timer->active_list_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 if (timer->running) {
421 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
422 goto __start_now;
423 timer->flags |= SNDRV_TIMER_FLG_RESCHED;
424 timeri->flags |= SNDRV_TIMER_IFLG_START;
425 return 1; /* delayed start */
426 } else {
427 timer->sticks = sticks;
428 timer->hw.start(timer);
429 __start_now:
430 timer->running++;
431 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
432 return 0;
433 }
434}
435
Takashi Iwai53d2f742005-11-17 13:56:05 +0100436static int snd_timer_start_slave(struct snd_timer_instance *timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437{
438 unsigned long flags;
439
440 spin_lock_irqsave(&slave_active_lock, flags);
441 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
442 if (timeri->master)
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200443 list_add_tail(&timeri->active_list,
444 &timeri->master->slave_active_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 spin_unlock_irqrestore(&slave_active_lock, flags);
446 return 1; /* delayed start */
447}
448
449/*
450 * start the timer instance
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200451 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100452int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100454 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 int result = -EINVAL;
456 unsigned long flags;
457
458 if (timeri == NULL || ticks < 1)
459 return -EINVAL;
460 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
461 result = snd_timer_start_slave(timeri);
462 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
463 return result;
464 }
465 timer = timeri->timer;
466 if (timer == NULL)
467 return -EINVAL;
468 spin_lock_irqsave(&timer->lock, flags);
469 timeri->ticks = timeri->cticks = ticks;
470 timeri->pticks = 0;
471 result = snd_timer_start1(timer, timeri, ticks);
472 spin_unlock_irqrestore(&timer->lock, flags);
473 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START);
474 return result;
475}
476
Takashi Iwai53d2f742005-11-17 13:56:05 +0100477static int _snd_timer_stop(struct snd_timer_instance * timeri,
478 int keep_flag, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100480 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 unsigned long flags;
482
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200483 if (snd_BUG_ON(!timeri))
484 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) {
487 if (!keep_flag) {
488 spin_lock_irqsave(&slave_active_lock, flags);
489 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
490 spin_unlock_irqrestore(&slave_active_lock, flags);
491 }
492 goto __end;
493 }
494 timer = timeri->timer;
495 if (!timer)
496 return -EINVAL;
497 spin_lock_irqsave(&timer->lock, flags);
498 list_del_init(&timeri->ack_list);
499 list_del_init(&timeri->active_list);
500 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) &&
501 !(--timer->running)) {
502 timer->hw.stop(timer);
503 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) {
504 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
505 snd_timer_reschedule(timer, 0);
506 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) {
507 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
508 timer->hw.start(timer);
509 }
510 }
511 }
512 if (!keep_flag)
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200513 timeri->flags &=
514 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 spin_unlock_irqrestore(&timer->lock, flags);
516 __end:
517 if (event != SNDRV_TIMER_EVENT_RESOLUTION)
518 snd_timer_notify1(timeri, event);
519 return 0;
520}
521
522/*
523 * stop the timer instance.
524 *
525 * do not call this from the timer callback!
526 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100527int snd_timer_stop(struct snd_timer_instance *timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100529 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 unsigned long flags;
531 int err;
532
533 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP);
534 if (err < 0)
535 return err;
536 timer = timeri->timer;
Takashi Iwai0584ffa2011-08-08 12:24:46 +0200537 if (!timer)
538 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 spin_lock_irqsave(&timer->lock, flags);
540 timeri->cticks = timeri->ticks;
541 timeri->pticks = 0;
542 spin_unlock_irqrestore(&timer->lock, flags);
543 return 0;
544}
545
546/*
547 * start again.. the tick is kept.
548 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100549int snd_timer_continue(struct snd_timer_instance *timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100551 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 int result = -EINVAL;
553 unsigned long flags;
554
555 if (timeri == NULL)
556 return result;
557 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
558 return snd_timer_start_slave(timeri);
559 timer = timeri->timer;
560 if (! timer)
561 return -EINVAL;
562 spin_lock_irqsave(&timer->lock, flags);
563 if (!timeri->cticks)
564 timeri->cticks = 1;
565 timeri->pticks = 0;
566 result = snd_timer_start1(timer, timeri, timer->sticks);
567 spin_unlock_irqrestore(&timer->lock, flags);
568 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE);
569 return result;
570}
571
572/*
573 * pause.. remember the ticks left
574 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100575int snd_timer_pause(struct snd_timer_instance * timeri)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576{
577 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE);
578}
579
580/*
581 * reschedule the timer
582 *
583 * start pending instances and check the scheduling ticks.
584 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer.
585 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100586static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100588 struct snd_timer_instance *ti;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 unsigned long ticks = ~0UL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590
Johannes Berg9244b2c2006-10-05 16:02:22 +0200591 list_for_each_entry(ti, &timer->active_list_head, active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 if (ti->flags & SNDRV_TIMER_IFLG_START) {
593 ti->flags &= ~SNDRV_TIMER_IFLG_START;
594 ti->flags |= SNDRV_TIMER_IFLG_RUNNING;
595 timer->running++;
596 }
597 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) {
598 if (ticks > ti->cticks)
599 ticks = ti->cticks;
600 }
601 }
602 if (ticks == ~0UL) {
603 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED;
604 return;
605 }
606 if (ticks > timer->hw.ticks)
607 ticks = timer->hw.ticks;
608 if (ticks_left != ticks)
609 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
610 timer->sticks = ticks;
611}
612
613/*
614 * timer tasklet
615 *
616 */
617static void snd_timer_tasklet(unsigned long arg)
618{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100619 struct snd_timer *timer = (struct snd_timer *) arg;
620 struct snd_timer_instance *ti;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 struct list_head *p;
622 unsigned long resolution, ticks;
Takashi Iwai2999ff52006-07-05 17:16:58 +0200623 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
Takashi Iwai2999ff52006-07-05 17:16:58 +0200625 spin_lock_irqsave(&timer->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 /* now process all callbacks */
627 while (!list_empty(&timer->sack_list_head)) {
628 p = timer->sack_list_head.next; /* get first item */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100629 ti = list_entry(p, struct snd_timer_instance, ack_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
631 /* remove from ack_list and make empty */
632 list_del_init(p);
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200633
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 ticks = ti->pticks;
635 ti->pticks = 0;
636 resolution = ti->resolution;
637
638 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
639 spin_unlock(&timer->lock);
640 if (ti->callback)
641 ti->callback(ti, resolution, ticks);
642 spin_lock(&timer->lock);
643 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
644 }
Takashi Iwai2999ff52006-07-05 17:16:58 +0200645 spin_unlock_irqrestore(&timer->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646}
647
648/*
649 * timer interrupt
650 *
651 * ticks_left is usually equal to timer->sticks.
652 *
653 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100654void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655{
Johannes Berg9244b2c2006-10-05 16:02:22 +0200656 struct snd_timer_instance *ti, *ts, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 unsigned long resolution, ticks;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200658 struct list_head *p, *ack_list_head;
Takashi Iwaib32425a2005-11-18 18:52:14 +0100659 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 int use_tasklet = 0;
661
662 if (timer == NULL)
663 return;
664
Takashi Iwaib32425a2005-11-18 18:52:14 +0100665 spin_lock_irqsave(&timer->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666
667 /* remember the current resolution */
668 if (timer->hw.c_resolution)
669 resolution = timer->hw.c_resolution(timer);
670 else
671 resolution = timer->hw.resolution;
672
673 /* loop for all active instances
Johannes Berg9244b2c2006-10-05 16:02:22 +0200674 * Here we cannot use list_for_each_entry because the active_list of a
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200675 * processed instance is relinked to done_list_head before the callback
676 * is called.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 */
Johannes Berg9244b2c2006-10-05 16:02:22 +0200678 list_for_each_entry_safe(ti, tmp, &timer->active_list_head,
679 active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING))
681 continue;
682 ti->pticks += ticks_left;
683 ti->resolution = resolution;
684 if (ti->cticks < ticks_left)
685 ti->cticks = 0;
686 else
687 ti->cticks -= ticks_left;
688 if (ti->cticks) /* not expired */
689 continue;
690 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) {
691 ti->cticks = ti->ticks;
692 } else {
693 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
694 if (--timer->running)
Johannes Berg9244b2c2006-10-05 16:02:22 +0200695 list_del(&ti->active_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 }
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200697 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) ||
698 (ti->flags & SNDRV_TIMER_IFLG_FAST))
699 ack_list_head = &timer->ack_list_head;
700 else
701 ack_list_head = &timer->sack_list_head;
702 if (list_empty(&ti->ack_list))
703 list_add_tail(&ti->ack_list, ack_list_head);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200704 list_for_each_entry(ts, &ti->slave_active_head, active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 ts->pticks = ti->pticks;
706 ts->resolution = resolution;
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200707 if (list_empty(&ts->ack_list))
708 list_add_tail(&ts->ack_list, ack_list_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 }
710 }
711 if (timer->flags & SNDRV_TIMER_FLG_RESCHED)
Clemens Ladischcd93fe42006-07-17 16:53:57 +0200712 snd_timer_reschedule(timer, timer->sticks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 if (timer->running) {
714 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) {
715 timer->hw.stop(timer);
716 timer->flags |= SNDRV_TIMER_FLG_CHANGE;
717 }
718 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) ||
719 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) {
720 /* restart timer */
721 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE;
722 timer->hw.start(timer);
723 }
724 } else {
725 timer->hw.stop(timer);
726 }
727
728 /* now process all fast callbacks */
729 while (!list_empty(&timer->ack_list_head)) {
730 p = timer->ack_list_head.next; /* get first item */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100731 ti = list_entry(p, struct snd_timer_instance, ack_list);
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200732
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 /* remove from ack_list and make empty */
734 list_del_init(p);
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200735
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 ticks = ti->pticks;
737 ti->pticks = 0;
738
739 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
740 spin_unlock(&timer->lock);
741 if (ti->callback)
742 ti->callback(ti, resolution, ticks);
743 spin_lock(&timer->lock);
744 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
745 }
746
747 /* do we have any slow callbacks? */
748 use_tasklet = !list_empty(&timer->sack_list_head);
Takashi Iwaib32425a2005-11-18 18:52:14 +0100749 spin_unlock_irqrestore(&timer->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750
751 if (use_tasklet)
Takashi Iwai1f041282008-12-18 12:17:55 +0100752 tasklet_schedule(&timer->task_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753}
754
755/*
756
757 */
758
Takashi Iwai53d2f742005-11-17 13:56:05 +0100759int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
760 struct snd_timer **rtimer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100762 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 int err;
Takashi Iwai53d2f742005-11-17 13:56:05 +0100764 static struct snd_device_ops ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 .dev_free = snd_timer_dev_free,
766 .dev_register = snd_timer_dev_register,
Takashi Iwaic4614822006-06-23 14:38:23 +0200767 .dev_disconnect = snd_timer_dev_disconnect,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 };
769
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200770 if (snd_BUG_ON(!tid))
771 return -EINVAL;
772 if (rtimer)
773 *rtimer = NULL;
Takashi Iwaica2c0962005-09-09 14:20:23 +0200774 timer = kzalloc(sizeof(*timer), GFP_KERNEL);
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100775 if (timer == NULL) {
776 snd_printk(KERN_ERR "timer: cannot allocate\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 return -ENOMEM;
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100778 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 timer->tmr_class = tid->dev_class;
780 timer->card = card;
781 timer->tmr_device = tid->device;
782 timer->tmr_subdevice = tid->subdevice;
783 if (id)
784 strlcpy(timer->id, id, sizeof(timer->id));
785 INIT_LIST_HEAD(&timer->device_list);
786 INIT_LIST_HEAD(&timer->open_list_head);
787 INIT_LIST_HEAD(&timer->active_list_head);
788 INIT_LIST_HEAD(&timer->ack_list_head);
789 INIT_LIST_HEAD(&timer->sack_list_head);
790 spin_lock_init(&timer->lock);
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200791 tasklet_init(&timer->task_queue, snd_timer_tasklet,
792 (unsigned long)timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 if (card != NULL) {
Clemens Ladischde242142005-10-12 17:12:31 +0200794 timer->module = card->module;
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200795 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops);
796 if (err < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 snd_timer_free(timer);
798 return err;
799 }
800 }
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200801 if (rtimer)
802 *rtimer = timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 return 0;
804}
805
Takashi Iwai53d2f742005-11-17 13:56:05 +0100806static int snd_timer_free(struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807{
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200808 if (!timer)
809 return 0;
Takashi Iwaic4614822006-06-23 14:38:23 +0200810
811 mutex_lock(&register_mutex);
812 if (! list_empty(&timer->open_list_head)) {
813 struct list_head *p, *n;
814 struct snd_timer_instance *ti;
815 snd_printk(KERN_WARNING "timer %p is busy?\n", timer);
816 list_for_each_safe(p, n, &timer->open_list_head) {
817 list_del_init(p);
818 ti = list_entry(p, struct snd_timer_instance, open_list);
819 ti->timer = NULL;
820 }
821 }
822 list_del(&timer->device_list);
823 mutex_unlock(&register_mutex);
824
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 if (timer->private_free)
826 timer->private_free(timer);
827 kfree(timer);
828 return 0;
829}
830
Takashi Iwai53d2f742005-11-17 13:56:05 +0100831static int snd_timer_dev_free(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100833 struct snd_timer *timer = device->device_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 return snd_timer_free(timer);
835}
836
Takashi Iwai53d2f742005-11-17 13:56:05 +0100837static int snd_timer_dev_register(struct snd_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100839 struct snd_timer *timer = dev->device_data;
840 struct snd_timer *timer1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200842 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop))
843 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) &&
845 !timer->hw.resolution && timer->hw.c_resolution == NULL)
846 return -EINVAL;
847
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100848 mutex_lock(&register_mutex);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200849 list_for_each_entry(timer1, &snd_timer_list, device_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 if (timer1->tmr_class > timer->tmr_class)
851 break;
852 if (timer1->tmr_class < timer->tmr_class)
853 continue;
854 if (timer1->card && timer->card) {
855 if (timer1->card->number > timer->card->number)
856 break;
857 if (timer1->card->number < timer->card->number)
858 continue;
859 }
860 if (timer1->tmr_device > timer->tmr_device)
861 break;
862 if (timer1->tmr_device < timer->tmr_device)
863 continue;
864 if (timer1->tmr_subdevice > timer->tmr_subdevice)
865 break;
866 if (timer1->tmr_subdevice < timer->tmr_subdevice)
867 continue;
868 /* conflicts.. */
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100869 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 return -EBUSY;
871 }
Johannes Berg9244b2c2006-10-05 16:02:22 +0200872 list_add_tail(&timer->device_list, &timer1->device_list);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100873 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 return 0;
875}
876
Takashi Iwaic4614822006-06-23 14:38:23 +0200877static int snd_timer_dev_disconnect(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100879 struct snd_timer *timer = device->device_data;
Takashi Iwaic4614822006-06-23 14:38:23 +0200880 mutex_lock(&register_mutex);
881 list_del_init(&timer->device_list);
882 mutex_unlock(&register_mutex);
883 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884}
885
Takashi Iwai53d2f742005-11-17 13:56:05 +0100886void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887{
888 unsigned long flags;
889 unsigned long resolution = 0;
Takashi Iwai53d2f742005-11-17 13:56:05 +0100890 struct snd_timer_instance *ti, *ts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891
Takashi Iwai7c22f1a2005-10-10 11:46:31 +0200892 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE))
893 return;
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200894 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
895 event > SNDRV_TIMER_EVENT_MRESUME))
896 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 spin_lock_irqsave(&timer->lock, flags);
Jaroslav Kyselaa501dfa2005-08-16 11:09:05 +0200898 if (event == SNDRV_TIMER_EVENT_MSTART ||
899 event == SNDRV_TIMER_EVENT_MCONTINUE ||
900 event == SNDRV_TIMER_EVENT_MRESUME) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 if (timer->hw.c_resolution)
902 resolution = timer->hw.c_resolution(timer);
903 else
904 resolution = timer->hw.resolution;
905 }
Johannes Berg9244b2c2006-10-05 16:02:22 +0200906 list_for_each_entry(ti, &timer->active_list_head, active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 if (ti->ccallback)
908 ti->ccallback(ti, event, tstamp, resolution);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200909 list_for_each_entry(ts, &ti->slave_active_head, active_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 if (ts->ccallback)
911 ts->ccallback(ts, event, tstamp, resolution);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 }
913 spin_unlock_irqrestore(&timer->lock, flags);
914}
915
916/*
917 * exported functions for global timers
918 */
Takashi Iwai53d2f742005-11-17 13:56:05 +0100919int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100921 struct snd_timer_id tid;
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200922
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
924 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
925 tid.card = -1;
926 tid.device = device;
927 tid.subdevice = 0;
928 return snd_timer_new(NULL, id, &tid, rtimer);
929}
930
Takashi Iwai53d2f742005-11-17 13:56:05 +0100931int snd_timer_global_free(struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932{
933 return snd_timer_free(timer);
934}
935
Takashi Iwai53d2f742005-11-17 13:56:05 +0100936int snd_timer_global_register(struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100938 struct snd_device dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939
940 memset(&dev, 0, sizeof(dev));
941 dev.device_data = timer;
942 return snd_timer_dev_register(&dev);
943}
944
Clemens Ladisch6b172a82005-10-12 17:20:21 +0200945/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 * System timer
947 */
948
949struct snd_timer_system_private {
950 struct timer_list tlist;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 unsigned long last_expires;
952 unsigned long last_jiffies;
953 unsigned long correction;
954};
955
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956static void snd_timer_s_function(unsigned long data)
957{
Takashi Iwai53d2f742005-11-17 13:56:05 +0100958 struct snd_timer *timer = (struct snd_timer *)data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 struct snd_timer_system_private *priv = timer->private_data;
960 unsigned long jiff = jiffies;
961 if (time_after(jiff, priv->last_expires))
Clemens Ladisch6ed5eff2006-07-17 16:51:37 +0200962 priv->correction += (long)jiff - (long)priv->last_expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies);
964}
965
Takashi Iwai53d2f742005-11-17 13:56:05 +0100966static int snd_timer_s_start(struct snd_timer * timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967{
968 struct snd_timer_system_private *priv;
969 unsigned long njiff;
970
971 priv = (struct snd_timer_system_private *) timer->private_data;
972 njiff = (priv->last_jiffies = jiffies);
973 if (priv->correction > timer->sticks - 1) {
974 priv->correction -= timer->sticks - 1;
975 njiff++;
976 } else {
977 njiff += timer->sticks - priv->correction;
Clemens Ladisch17f48ec2006-07-17 16:50:56 +0200978 priv->correction = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 }
980 priv->last_expires = priv->tlist.expires = njiff;
981 add_timer(&priv->tlist);
982 return 0;
983}
984
Takashi Iwai53d2f742005-11-17 13:56:05 +0100985static int snd_timer_s_stop(struct snd_timer * timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986{
987 struct snd_timer_system_private *priv;
988 unsigned long jiff;
989
990 priv = (struct snd_timer_system_private *) timer->private_data;
991 del_timer(&priv->tlist);
992 jiff = jiffies;
993 if (time_before(jiff, priv->last_expires))
994 timer->sticks = priv->last_expires - jiff;
995 else
996 timer->sticks = 1;
Clemens Ladischde2696d2006-07-17 16:52:09 +0200997 priv->correction = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 return 0;
999}
1000
Takashi Iwai53d2f742005-11-17 13:56:05 +01001001static struct snd_timer_hardware snd_timer_system =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002{
1003 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET,
1004 .resolution = 1000000000L / HZ,
1005 .ticks = 10000000L,
1006 .start = snd_timer_s_start,
1007 .stop = snd_timer_s_stop
1008};
1009
Takashi Iwai53d2f742005-11-17 13:56:05 +01001010static void snd_timer_free_system(struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011{
1012 kfree(timer->private_data);
1013}
1014
1015static int snd_timer_register_system(void)
1016{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001017 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 struct snd_timer_system_private *priv;
1019 int err;
1020
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001021 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer);
1022 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 return err;
1024 strcpy(timer->name, "system timer");
1025 timer->hw = snd_timer_system;
Takashi Iwaica2c0962005-09-09 14:20:23 +02001026 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 if (priv == NULL) {
1028 snd_timer_free(timer);
1029 return -ENOMEM;
1030 }
1031 init_timer(&priv->tlist);
1032 priv->tlist.function = snd_timer_s_function;
1033 priv->tlist.data = (unsigned long) timer;
1034 timer->private_data = priv;
1035 timer->private_free = snd_timer_free_system;
1036 return snd_timer_global_register(timer);
1037}
1038
Takashi Iwaie28563c2005-12-01 10:42:42 +01001039#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040/*
1041 * Info interface
1042 */
1043
Takashi Iwai53d2f742005-11-17 13:56:05 +01001044static void snd_timer_proc_read(struct snd_info_entry *entry,
1045 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001047 struct snd_timer *timer;
1048 struct snd_timer_instance *ti;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001050 mutex_lock(&register_mutex);
Johannes Berg9244b2c2006-10-05 16:02:22 +02001051 list_for_each_entry(timer, &snd_timer_list, device_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 switch (timer->tmr_class) {
1053 case SNDRV_TIMER_CLASS_GLOBAL:
1054 snd_iprintf(buffer, "G%i: ", timer->tmr_device);
1055 break;
1056 case SNDRV_TIMER_CLASS_CARD:
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001057 snd_iprintf(buffer, "C%i-%i: ",
1058 timer->card->number, timer->tmr_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 break;
1060 case SNDRV_TIMER_CLASS_PCM:
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001061 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number,
1062 timer->tmr_device, timer->tmr_subdevice);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 break;
1064 default:
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001065 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class,
1066 timer->card ? timer->card->number : -1,
1067 timer->tmr_device, timer->tmr_subdevice);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 }
1069 snd_iprintf(buffer, "%s :", timer->name);
1070 if (timer->hw.resolution)
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001071 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
1072 timer->hw.resolution / 1000,
1073 timer->hw.resolution % 1000,
1074 timer->hw.ticks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
1076 snd_iprintf(buffer, " SLAVE");
1077 snd_iprintf(buffer, "\n");
Johannes Berg9244b2c2006-10-05 16:02:22 +02001078 list_for_each_entry(ti, &timer->open_list_head, open_list)
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001079 snd_iprintf(buffer, " Client %s : %s\n",
1080 ti->owner ? ti->owner : "unknown",
1081 ti->flags & (SNDRV_TIMER_IFLG_START |
1082 SNDRV_TIMER_IFLG_RUNNING)
1083 ? "running" : "stopped");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001085 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086}
1087
Takashi Iwai6581f4e2006-05-17 17:14:51 +02001088static struct snd_info_entry *snd_timer_proc_entry;
Takashi Iwaie28563c2005-12-01 10:42:42 +01001089
1090static void __init snd_timer_proc_init(void)
1091{
1092 struct snd_info_entry *entry;
1093
1094 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL);
1095 if (entry != NULL) {
Takashi Iwaie28563c2005-12-01 10:42:42 +01001096 entry->c.text.read = snd_timer_proc_read;
1097 if (snd_info_register(entry) < 0) {
1098 snd_info_free_entry(entry);
1099 entry = NULL;
1100 }
1101 }
1102 snd_timer_proc_entry = entry;
1103}
1104
1105static void __exit snd_timer_proc_done(void)
1106{
Takashi Iwai746d4a02006-06-23 14:37:59 +02001107 snd_info_free_entry(snd_timer_proc_entry);
Takashi Iwaie28563c2005-12-01 10:42:42 +01001108}
1109#else /* !CONFIG_PROC_FS */
1110#define snd_timer_proc_init()
1111#define snd_timer_proc_done()
1112#endif
1113
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114/*
1115 * USER SPACE interface
1116 */
1117
Takashi Iwai53d2f742005-11-17 13:56:05 +01001118static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 unsigned long resolution,
1120 unsigned long ticks)
1121{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001122 struct snd_timer_user *tu = timeri->callback_data;
1123 struct snd_timer_read *r;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 int prev;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001125
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 spin_lock(&tu->qlock);
1127 if (tu->qused > 0) {
1128 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1129 r = &tu->queue[prev];
1130 if (r->resolution == resolution) {
1131 r->ticks += ticks;
1132 goto __wake;
1133 }
1134 }
1135 if (tu->qused >= tu->queue_size) {
1136 tu->overrun++;
1137 } else {
1138 r = &tu->queue[tu->qtail++];
1139 tu->qtail %= tu->queue_size;
1140 r->resolution = resolution;
1141 r->ticks = ticks;
1142 tu->qused++;
1143 }
1144 __wake:
1145 spin_unlock(&tu->qlock);
1146 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1147 wake_up(&tu->qchange_sleep);
1148}
1149
Takashi Iwai53d2f742005-11-17 13:56:05 +01001150static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
1151 struct snd_timer_tread *tread)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152{
1153 if (tu->qused >= tu->queue_size) {
1154 tu->overrun++;
1155 } else {
1156 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread));
1157 tu->qtail %= tu->queue_size;
1158 tu->qused++;
1159 }
1160}
1161
Takashi Iwai53d2f742005-11-17 13:56:05 +01001162static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
1163 int event,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 struct timespec *tstamp,
1165 unsigned long resolution)
1166{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001167 struct snd_timer_user *tu = timeri->callback_data;
1168 struct snd_timer_tread r1;
Dan Carpenterbfe70782010-04-28 10:29:14 +02001169 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001171 if (event >= SNDRV_TIMER_EVENT_START &&
1172 event <= SNDRV_TIMER_EVENT_PAUSE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 tu->tstamp = *tstamp;
1174 if ((tu->filter & (1 << event)) == 0 || !tu->tread)
1175 return;
1176 r1.event = event;
1177 r1.tstamp = *tstamp;
1178 r1.val = resolution;
Dan Carpenterbfe70782010-04-28 10:29:14 +02001179 spin_lock_irqsave(&tu->qlock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 snd_timer_user_append_to_tqueue(tu, &r1);
Dan Carpenterbfe70782010-04-28 10:29:14 +02001181 spin_unlock_irqrestore(&tu->qlock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1183 wake_up(&tu->qchange_sleep);
1184}
1185
Takashi Iwai53d2f742005-11-17 13:56:05 +01001186static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 unsigned long resolution,
1188 unsigned long ticks)
1189{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001190 struct snd_timer_user *tu = timeri->callback_data;
1191 struct snd_timer_tread *r, r1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 struct timespec tstamp;
1193 int prev, append = 0;
1194
Takashi Iwai07799e72005-10-10 11:49:49 +02001195 memset(&tstamp, 0, sizeof(tstamp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 spin_lock(&tu->qlock);
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001197 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
1198 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 spin_unlock(&tu->qlock);
1200 return;
1201 }
Jaroslav Kyselab751eef2007-12-13 10:19:42 +01001202 if (tu->last_resolution != resolution || ticks > 0) {
1203 if (timer_tstamp_monotonic)
1204 do_posix_clock_monotonic_gettime(&tstamp);
1205 else
1206 getnstimeofday(&tstamp);
1207 }
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001208 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
1209 tu->last_resolution != resolution) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
1211 r1.tstamp = tstamp;
1212 r1.val = resolution;
1213 snd_timer_user_append_to_tqueue(tu, &r1);
1214 tu->last_resolution = resolution;
1215 append++;
1216 }
1217 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
1218 goto __wake;
1219 if (ticks == 0)
1220 goto __wake;
1221 if (tu->qused > 0) {
1222 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
1223 r = &tu->tqueue[prev];
1224 if (r->event == SNDRV_TIMER_EVENT_TICK) {
1225 r->tstamp = tstamp;
1226 r->val += ticks;
1227 append++;
1228 goto __wake;
1229 }
1230 }
1231 r1.event = SNDRV_TIMER_EVENT_TICK;
1232 r1.tstamp = tstamp;
1233 r1.val = ticks;
1234 snd_timer_user_append_to_tqueue(tu, &r1);
1235 append++;
1236 __wake:
1237 spin_unlock(&tu->qlock);
1238 if (append == 0)
1239 return;
1240 kill_fasync(&tu->fasync, SIGIO, POLL_IN);
1241 wake_up(&tu->qchange_sleep);
1242}
1243
1244static int snd_timer_user_open(struct inode *inode, struct file *file)
1245{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001246 struct snd_timer_user *tu;
Takashi Iwai02f48652010-04-13 11:49:04 +02001247 int err;
1248
1249 err = nonseekable_open(inode, file);
1250 if (err < 0)
1251 return err;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001252
Takashi Iwaica2c0962005-09-09 14:20:23 +02001253 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 if (tu == NULL)
1255 return -ENOMEM;
1256 spin_lock_init(&tu->qlock);
1257 init_waitqueue_head(&tu->qchange_sleep);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001258 mutex_init(&tu->tread_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 tu->ticks = 1;
1260 tu->queue_size = 128;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001261 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001262 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 if (tu->queue == NULL) {
1264 kfree(tu);
1265 return -ENOMEM;
1266 }
1267 file->private_data = tu;
1268 return 0;
1269}
1270
1271static int snd_timer_user_release(struct inode *inode, struct file *file)
1272{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001273 struct snd_timer_user *tu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274
1275 if (file->private_data) {
1276 tu = file->private_data;
1277 file->private_data = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 if (tu->timeri)
1279 snd_timer_close(tu->timeri);
1280 kfree(tu->queue);
1281 kfree(tu->tqueue);
1282 kfree(tu);
1283 }
1284 return 0;
1285}
1286
Takashi Iwai53d2f742005-11-17 13:56:05 +01001287static void snd_timer_user_zero_id(struct snd_timer_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288{
1289 id->dev_class = SNDRV_TIMER_CLASS_NONE;
1290 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1291 id->card = -1;
1292 id->device = -1;
1293 id->subdevice = -1;
1294}
1295
Takashi Iwai53d2f742005-11-17 13:56:05 +01001296static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297{
1298 id->dev_class = timer->tmr_class;
1299 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE;
1300 id->card = timer->card ? timer->card->number : -1;
1301 id->device = timer->tmr_device;
1302 id->subdevice = timer->tmr_subdevice;
1303}
1304
Takashi Iwai53d2f742005-11-17 13:56:05 +01001305static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001307 struct snd_timer_id id;
1308 struct snd_timer *timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 struct list_head *p;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001310
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 if (copy_from_user(&id, _tid, sizeof(id)))
1312 return -EFAULT;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001313 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 if (id.dev_class < 0) { /* first item */
1315 if (list_empty(&snd_timer_list))
1316 snd_timer_user_zero_id(&id);
1317 else {
Clemens Ladisch9dfba382005-10-12 17:14:55 +02001318 timer = list_entry(snd_timer_list.next,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001319 struct snd_timer, device_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 snd_timer_user_copy_id(&id, timer);
1321 }
1322 } else {
1323 switch (id.dev_class) {
1324 case SNDRV_TIMER_CLASS_GLOBAL:
1325 id.device = id.device < 0 ? 0 : id.device + 1;
1326 list_for_each(p, &snd_timer_list) {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001327 timer = list_entry(p, struct snd_timer, device_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
1329 snd_timer_user_copy_id(&id, timer);
1330 break;
1331 }
1332 if (timer->tmr_device >= id.device) {
1333 snd_timer_user_copy_id(&id, timer);
1334 break;
1335 }
1336 }
1337 if (p == &snd_timer_list)
1338 snd_timer_user_zero_id(&id);
1339 break;
1340 case SNDRV_TIMER_CLASS_CARD:
1341 case SNDRV_TIMER_CLASS_PCM:
1342 if (id.card < 0) {
1343 id.card = 0;
1344 } else {
1345 if (id.card < 0) {
1346 id.card = 0;
1347 } else {
1348 if (id.device < 0) {
1349 id.device = 0;
1350 } else {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001351 if (id.subdevice < 0) {
1352 id.subdevice = 0;
1353 } else {
1354 id.subdevice++;
1355 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356 }
1357 }
1358 }
1359 list_for_each(p, &snd_timer_list) {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001360 timer = list_entry(p, struct snd_timer, device_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 if (timer->tmr_class > id.dev_class) {
1362 snd_timer_user_copy_id(&id, timer);
1363 break;
1364 }
1365 if (timer->tmr_class < id.dev_class)
1366 continue;
1367 if (timer->card->number > id.card) {
1368 snd_timer_user_copy_id(&id, timer);
1369 break;
1370 }
1371 if (timer->card->number < id.card)
1372 continue;
1373 if (timer->tmr_device > id.device) {
1374 snd_timer_user_copy_id(&id, timer);
1375 break;
1376 }
1377 if (timer->tmr_device < id.device)
1378 continue;
1379 if (timer->tmr_subdevice > id.subdevice) {
1380 snd_timer_user_copy_id(&id, timer);
1381 break;
1382 }
1383 if (timer->tmr_subdevice < id.subdevice)
1384 continue;
1385 snd_timer_user_copy_id(&id, timer);
1386 break;
1387 }
1388 if (p == &snd_timer_list)
1389 snd_timer_user_zero_id(&id);
1390 break;
1391 default:
1392 snd_timer_user_zero_id(&id);
1393 }
1394 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001395 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 if (copy_to_user(_tid, &id, sizeof(*_tid)))
1397 return -EFAULT;
1398 return 0;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001399}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001401static int snd_timer_user_ginfo(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001402 struct snd_timer_ginfo __user *_ginfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001404 struct snd_timer_ginfo *ginfo;
1405 struct snd_timer_id tid;
1406 struct snd_timer *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 struct list_head *p;
1408 int err = 0;
1409
Li Zefanef44a1e2009-04-10 09:43:08 +08001410 ginfo = memdup_user(_ginfo, sizeof(*ginfo));
1411 if (IS_ERR(ginfo))
1412 return PTR_ERR(ginfo);
1413
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 tid = ginfo->tid;
1415 memset(ginfo, 0, sizeof(*ginfo));
1416 ginfo->tid = tid;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001417 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 t = snd_timer_find(&tid);
1419 if (t != NULL) {
1420 ginfo->card = t->card ? t->card->number : -1;
1421 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1422 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
1423 strlcpy(ginfo->id, t->id, sizeof(ginfo->id));
1424 strlcpy(ginfo->name, t->name, sizeof(ginfo->name));
1425 ginfo->resolution = t->hw.resolution;
1426 if (t->hw.resolution_min > 0) {
1427 ginfo->resolution_min = t->hw.resolution_min;
1428 ginfo->resolution_max = t->hw.resolution_max;
1429 }
1430 list_for_each(p, &t->open_list_head) {
1431 ginfo->clients++;
1432 }
1433 } else {
1434 err = -ENODEV;
1435 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001436 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
1438 err = -EFAULT;
1439 kfree(ginfo);
1440 return err;
1441}
1442
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001443static int snd_timer_user_gparams(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001444 struct snd_timer_gparams __user *_gparams)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001446 struct snd_timer_gparams gparams;
1447 struct snd_timer *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448 int err;
1449
1450 if (copy_from_user(&gparams, _gparams, sizeof(gparams)))
1451 return -EFAULT;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001452 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 t = snd_timer_find(&gparams.tid);
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001454 if (!t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455 err = -ENODEV;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001456 goto _error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 }
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001458 if (!list_empty(&t->open_list_head)) {
1459 err = -EBUSY;
1460 goto _error;
1461 }
1462 if (!t->hw.set_period) {
1463 err = -ENOSYS;
1464 goto _error;
1465 }
1466 err = t->hw.set_period(t, gparams.period_num, gparams.period_den);
1467_error:
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001468 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469 return err;
1470}
1471
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001472static int snd_timer_user_gstatus(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001473 struct snd_timer_gstatus __user *_gstatus)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001475 struct snd_timer_gstatus gstatus;
1476 struct snd_timer_id tid;
1477 struct snd_timer *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 int err = 0;
1479
1480 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
1481 return -EFAULT;
1482 tid = gstatus.tid;
1483 memset(&gstatus, 0, sizeof(gstatus));
1484 gstatus.tid = tid;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001485 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486 t = snd_timer_find(&tid);
1487 if (t != NULL) {
1488 if (t->hw.c_resolution)
1489 gstatus.resolution = t->hw.c_resolution(t);
1490 else
1491 gstatus.resolution = t->hw.resolution;
1492 if (t->hw.precise_resolution) {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001493 t->hw.precise_resolution(t, &gstatus.resolution_num,
1494 &gstatus.resolution_den);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495 } else {
1496 gstatus.resolution_num = gstatus.resolution;
1497 gstatus.resolution_den = 1000000000uL;
1498 }
1499 } else {
1500 err = -ENODEV;
1501 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001502 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
1504 err = -EFAULT;
1505 return err;
1506}
1507
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001508static int snd_timer_user_tselect(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001509 struct snd_timer_select __user *_tselect)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001511 struct snd_timer_user *tu;
1512 struct snd_timer_select tselect;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513 char str[32];
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001514 int err = 0;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001515
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 tu = file->private_data;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001517 mutex_lock(&tu->tread_sem);
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001518 if (tu->timeri) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519 snd_timer_close(tu->timeri);
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001520 tu->timeri = NULL;
1521 }
1522 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
1523 err = -EFAULT;
1524 goto __err;
1525 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 sprintf(str, "application %i", current->pid);
1527 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
1528 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001529 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid);
1530 if (err < 0)
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001531 goto __err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532
Jesper Juhl4d572772005-05-30 17:30:32 +02001533 kfree(tu->queue);
1534 tu->queue = NULL;
1535 kfree(tu->tqueue);
1536 tu->tqueue = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 if (tu->tread) {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001538 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001539 GFP_KERNEL);
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001540 if (tu->tqueue == NULL)
1541 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542 } else {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001543 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001544 GFP_KERNEL);
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001545 if (tu->queue == NULL)
1546 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547 }
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001548
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001549 if (err < 0) {
1550 snd_timer_close(tu->timeri);
1551 tu->timeri = NULL;
1552 } else {
1553 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001554 tu->timeri->callback = tu->tread
1555 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001556 tu->timeri->ccallback = snd_timer_user_ccallback;
1557 tu->timeri->callback_data = (void *)tu;
1558 }
1559
1560 __err:
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001561 mutex_unlock(&tu->tread_sem);
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001562 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563}
1564
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001565static int snd_timer_user_info(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001566 struct snd_timer_info __user *_info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001568 struct snd_timer_user *tu;
1569 struct snd_timer_info *info;
1570 struct snd_timer *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571 int err = 0;
1572
1573 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001574 if (!tu->timeri)
1575 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 t = tu->timeri->timer;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001577 if (!t)
1578 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579
Takashi Iwaica2c0962005-09-09 14:20:23 +02001580 info = kzalloc(sizeof(*info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 if (! info)
1582 return -ENOMEM;
1583 info->card = t->card ? t->card->number : -1;
1584 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
1585 info->flags |= SNDRV_TIMER_FLG_SLAVE;
1586 strlcpy(info->id, t->id, sizeof(info->id));
1587 strlcpy(info->name, t->name, sizeof(info->name));
1588 info->resolution = t->hw.resolution;
1589 if (copy_to_user(_info, info, sizeof(*_info)))
1590 err = -EFAULT;
1591 kfree(info);
1592 return err;
1593}
1594
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001595static int snd_timer_user_params(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001596 struct snd_timer_params __user *_params)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001598 struct snd_timer_user *tu;
1599 struct snd_timer_params params;
1600 struct snd_timer *t;
1601 struct snd_timer_read *tr;
1602 struct snd_timer_tread *ttr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 int err;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001604
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001606 if (!tu->timeri)
1607 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608 t = tu->timeri->timer;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001609 if (!t)
1610 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611 if (copy_from_user(&params, _params, sizeof(params)))
1612 return -EFAULT;
1613 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) {
1614 err = -EINVAL;
1615 goto _end;
1616 }
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001617 if (params.queue_size > 0 &&
1618 (params.queue_size < 32 || params.queue_size > 1024)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619 err = -EINVAL;
1620 goto _end;
1621 }
1622 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)|
1623 (1<<SNDRV_TIMER_EVENT_TICK)|
1624 (1<<SNDRV_TIMER_EVENT_START)|
1625 (1<<SNDRV_TIMER_EVENT_STOP)|
1626 (1<<SNDRV_TIMER_EVENT_CONTINUE)|
1627 (1<<SNDRV_TIMER_EVENT_PAUSE)|
Jaroslav Kyselaa501dfa2005-08-16 11:09:05 +02001628 (1<<SNDRV_TIMER_EVENT_SUSPEND)|
1629 (1<<SNDRV_TIMER_EVENT_RESUME)|
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 (1<<SNDRV_TIMER_EVENT_MSTART)|
1631 (1<<SNDRV_TIMER_EVENT_MSTOP)|
1632 (1<<SNDRV_TIMER_EVENT_MCONTINUE)|
Jaroslav Kysela65d11d92005-08-16 13:05:43 +02001633 (1<<SNDRV_TIMER_EVENT_MPAUSE)|
1634 (1<<SNDRV_TIMER_EVENT_MSUSPEND)|
Jaroslav Kyselaa501dfa2005-08-16 11:09:05 +02001635 (1<<SNDRV_TIMER_EVENT_MRESUME))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636 err = -EINVAL;
1637 goto _end;
1638 }
1639 snd_timer_stop(tu->timeri);
1640 spin_lock_irq(&t->lock);
1641 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
1642 SNDRV_TIMER_IFLG_EXCLUSIVE|
1643 SNDRV_TIMER_IFLG_EARLY_EVENT);
1644 if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
1645 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
1646 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
1647 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
1648 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
1649 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
1650 spin_unlock_irq(&t->lock);
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001651 if (params.queue_size > 0 &&
1652 (unsigned int)tu->queue_size != params.queue_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653 if (tu->tread) {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001654 ttr = kmalloc(params.queue_size * sizeof(*ttr),
1655 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 if (ttr) {
1657 kfree(tu->tqueue);
1658 tu->queue_size = params.queue_size;
1659 tu->tqueue = ttr;
1660 }
1661 } else {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001662 tr = kmalloc(params.queue_size * sizeof(*tr),
1663 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664 if (tr) {
1665 kfree(tu->queue);
1666 tu->queue_size = params.queue_size;
1667 tu->queue = tr;
1668 }
1669 }
1670 }
1671 tu->qhead = tu->qtail = tu->qused = 0;
1672 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
1673 if (tu->tread) {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001674 struct snd_timer_tread tread;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675 tread.event = SNDRV_TIMER_EVENT_EARLY;
1676 tread.tstamp.tv_sec = 0;
1677 tread.tstamp.tv_nsec = 0;
1678 tread.val = 0;
1679 snd_timer_user_append_to_tqueue(tu, &tread);
1680 } else {
Takashi Iwai53d2f742005-11-17 13:56:05 +01001681 struct snd_timer_read *r = &tu->queue[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682 r->resolution = 0;
1683 r->ticks = 0;
1684 tu->qused++;
1685 tu->qtail++;
1686 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687 }
1688 tu->filter = params.filter;
1689 tu->ticks = params.ticks;
1690 err = 0;
1691 _end:
1692 if (copy_to_user(_params, &params, sizeof(params)))
1693 return -EFAULT;
1694 return err;
1695}
1696
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001697static int snd_timer_user_status(struct file *file,
Takashi Iwai53d2f742005-11-17 13:56:05 +01001698 struct snd_timer_status __user *_status)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001700 struct snd_timer_user *tu;
1701 struct snd_timer_status status;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001702
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001704 if (!tu->timeri)
1705 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706 memset(&status, 0, sizeof(status));
1707 status.tstamp = tu->tstamp;
1708 status.resolution = snd_timer_resolution(tu->timeri);
1709 status.lost = tu->timeri->lost;
1710 status.overrun = tu->overrun;
1711 spin_lock_irq(&tu->qlock);
1712 status.queue = tu->qused;
1713 spin_unlock_irq(&tu->qlock);
1714 if (copy_to_user(_status, &status, sizeof(status)))
1715 return -EFAULT;
1716 return 0;
1717}
1718
1719static int snd_timer_user_start(struct file *file)
1720{
1721 int err;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001722 struct snd_timer_user *tu;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001723
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001725 if (!tu->timeri)
1726 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727 snd_timer_stop(tu->timeri);
1728 tu->timeri->lost = 0;
1729 tu->last_resolution = 0;
1730 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0;
1731}
1732
1733static int snd_timer_user_stop(struct file *file)
1734{
1735 int err;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001736 struct snd_timer_user *tu;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001737
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001739 if (!tu->timeri)
1740 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0;
1742}
1743
1744static int snd_timer_user_continue(struct file *file)
1745{
1746 int err;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001747 struct snd_timer_user *tu;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001748
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001750 if (!tu->timeri)
1751 return -EBADFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752 tu->timeri->lost = 0;
1753 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0;
1754}
1755
Takashi Iwai15790a62005-05-15 15:04:14 +02001756static int snd_timer_user_pause(struct file *file)
1757{
1758 int err;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001759 struct snd_timer_user *tu;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001760
Takashi Iwai15790a62005-05-15 15:04:14 +02001761 tu = file->private_data;
Clemens Ladisch7c64ec32007-07-16 11:01:30 +02001762 if (!tu->timeri)
1763 return -EBADFD;
Jaroslav Kyselad138b442005-05-16 13:51:39 +02001764 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0;
Takashi Iwai15790a62005-05-15 15:04:14 +02001765}
1766
Takashi Iwai8c50b372005-05-15 15:43:54 +02001767enum {
1768 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20),
1769 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21),
1770 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22),
1771 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
1772};
1773
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001774static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
1775 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001777 struct snd_timer_user *tu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778 void __user *argp = (void __user *)arg;
1779 int __user *p = argp;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001780
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781 tu = file->private_data;
1782 switch (cmd) {
1783 case SNDRV_TIMER_IOCTL_PVERSION:
1784 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0;
1785 case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
1786 return snd_timer_user_next_device(argp);
1787 case SNDRV_TIMER_IOCTL_TREAD:
1788 {
1789 int xarg;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001790
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001791 mutex_lock(&tu->tread_sem);
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001792 if (tu->timeri) { /* too late */
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001793 mutex_unlock(&tu->tread_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794 return -EBUSY;
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001795 }
1796 if (get_user(xarg, p)) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001797 mutex_unlock(&tu->tread_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798 return -EFAULT;
Jaroslav Kyselac1935b42005-04-04 16:44:58 +02001799 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 tu->tread = xarg ? 1 : 0;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001801 mutex_unlock(&tu->tread_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802 return 0;
1803 }
1804 case SNDRV_TIMER_IOCTL_GINFO:
1805 return snd_timer_user_ginfo(file, argp);
1806 case SNDRV_TIMER_IOCTL_GPARAMS:
1807 return snd_timer_user_gparams(file, argp);
1808 case SNDRV_TIMER_IOCTL_GSTATUS:
1809 return snd_timer_user_gstatus(file, argp);
1810 case SNDRV_TIMER_IOCTL_SELECT:
1811 return snd_timer_user_tselect(file, argp);
1812 case SNDRV_TIMER_IOCTL_INFO:
1813 return snd_timer_user_info(file, argp);
1814 case SNDRV_TIMER_IOCTL_PARAMS:
1815 return snd_timer_user_params(file, argp);
1816 case SNDRV_TIMER_IOCTL_STATUS:
1817 return snd_timer_user_status(file, argp);
1818 case SNDRV_TIMER_IOCTL_START:
Takashi Iwai8c50b372005-05-15 15:43:54 +02001819 case SNDRV_TIMER_IOCTL_START_OLD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820 return snd_timer_user_start(file);
1821 case SNDRV_TIMER_IOCTL_STOP:
Takashi Iwai8c50b372005-05-15 15:43:54 +02001822 case SNDRV_TIMER_IOCTL_STOP_OLD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823 return snd_timer_user_stop(file);
1824 case SNDRV_TIMER_IOCTL_CONTINUE:
Takashi Iwai8c50b372005-05-15 15:43:54 +02001825 case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826 return snd_timer_user_continue(file);
Takashi Iwai15790a62005-05-15 15:04:14 +02001827 case SNDRV_TIMER_IOCTL_PAUSE:
Takashi Iwai8c50b372005-05-15 15:43:54 +02001828 case SNDRV_TIMER_IOCTL_PAUSE_OLD:
Takashi Iwai15790a62005-05-15 15:04:14 +02001829 return snd_timer_user_pause(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830 }
1831 return -ENOTTY;
1832}
1833
1834static int snd_timer_user_fasync(int fd, struct file * file, int on)
1835{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001836 struct snd_timer_user *tu;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001837
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838 tu = file->private_data;
Jonathan Corbet60aa4922009-02-01 14:52:56 -07001839 return fasync_helper(fd, file, on, &tu->fasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840}
1841
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001842static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
1843 size_t count, loff_t *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844{
Takashi Iwai53d2f742005-11-17 13:56:05 +01001845 struct snd_timer_user *tu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846 long result = 0, unit;
1847 int err = 0;
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001848
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849 tu = file->private_data;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001850 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 spin_lock_irq(&tu->qlock);
1852 while ((long)count - result >= unit) {
1853 while (!tu->qused) {
1854 wait_queue_t wait;
1855
1856 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1857 err = -EAGAIN;
1858 break;
1859 }
1860
1861 set_current_state(TASK_INTERRUPTIBLE);
1862 init_waitqueue_entry(&wait, current);
1863 add_wait_queue(&tu->qchange_sleep, &wait);
1864
1865 spin_unlock_irq(&tu->qlock);
1866 schedule();
1867 spin_lock_irq(&tu->qlock);
1868
1869 remove_wait_queue(&tu->qchange_sleep, &wait);
1870
1871 if (signal_pending(current)) {
1872 err = -ERESTARTSYS;
1873 break;
1874 }
1875 }
1876
1877 spin_unlock_irq(&tu->qlock);
1878 if (err < 0)
1879 goto _error;
1880
1881 if (tu->tread) {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001882 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++],
Takashi Iwai53d2f742005-11-17 13:56:05 +01001883 sizeof(struct snd_timer_tread))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884 err = -EFAULT;
1885 goto _error;
1886 }
1887 } else {
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001888 if (copy_to_user(buffer, &tu->queue[tu->qhead++],
Takashi Iwai53d2f742005-11-17 13:56:05 +01001889 sizeof(struct snd_timer_read))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890 err = -EFAULT;
1891 goto _error;
1892 }
1893 }
1894
1895 tu->qhead %= tu->queue_size;
1896
1897 result += unit;
1898 buffer += unit;
1899
1900 spin_lock_irq(&tu->qlock);
1901 tu->qused--;
1902 }
1903 spin_unlock_irq(&tu->qlock);
1904 _error:
1905 return result > 0 ? result : err;
1906}
1907
1908static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
1909{
1910 unsigned int mask;
Takashi Iwai53d2f742005-11-17 13:56:05 +01001911 struct snd_timer_user *tu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912
1913 tu = file->private_data;
1914
1915 poll_wait(file, &tu->qchange_sleep, wait);
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001916
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917 mask = 0;
1918 if (tu->qused)
1919 mask |= POLLIN | POLLRDNORM;
1920
1921 return mask;
1922}
1923
1924#ifdef CONFIG_COMPAT
1925#include "timer_compat.c"
1926#else
1927#define snd_timer_user_ioctl_compat NULL
1928#endif
1929
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001930static const struct file_operations snd_timer_f_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931{
1932 .owner = THIS_MODULE,
1933 .read = snd_timer_user_read,
1934 .open = snd_timer_user_open,
1935 .release = snd_timer_user_release,
Takashi Iwai02f48652010-04-13 11:49:04 +02001936 .llseek = no_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937 .poll = snd_timer_user_poll,
1938 .unlocked_ioctl = snd_timer_user_ioctl,
1939 .compat_ioctl = snd_timer_user_ioctl_compat,
1940 .fasync = snd_timer_user_fasync,
1941};
1942
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943/*
1944 * ENTRY functions
1945 */
1946
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947static int __init alsa_timer_init(void)
1948{
1949 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950
1951#ifdef SNDRV_OSS_INFO_DEV_TIMERS
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001952 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1,
1953 "system timer");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954#endif
Takashi Iwaie28563c2005-12-01 10:42:42 +01001955
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956 if ((err = snd_timer_register_system()) < 0)
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001957 snd_printk(KERN_ERR "unable to register system timer (%i)\n",
1958 err);
Clemens Ladischf87135f2005-11-20 14:06:59 +01001959 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
1960 &snd_timer_f_ops, NULL, "timer")) < 0)
Clemens Ladisch6b172a82005-10-12 17:20:21 +02001961 snd_printk(KERN_ERR "unable to register timer device (%i)\n",
1962 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);