Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Timers abstract layer | |
c1017a4c | 4 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
5 | */ |
6 | ||
1da177e4 LT |
7 | #include <linux/delay.h> |
8 | #include <linux/init.h> | |
1da177e4 LT |
9 | #include <linux/slab.h> |
10 | #include <linux/time.h> | |
1a60d4c5 | 11 | #include <linux/mutex.h> |
51990e82 | 12 | #include <linux/device.h> |
65a77217 | 13 | #include <linux/module.h> |
543537bd | 14 | #include <linux/string.h> |
174cd4b1 | 15 | #include <linux/sched/signal.h> |
1da177e4 LT |
16 | #include <sound/core.h> |
17 | #include <sound/timer.h> | |
18 | #include <sound/control.h> | |
19 | #include <sound/info.h> | |
20 | #include <sound/minors.h> | |
21 | #include <sound/initval.h> | |
22 | #include <linux/kmod.h> | |
1da177e4 | 23 | |
9f8a7658 TI |
24 | /* internal flags */ |
25 | #define SNDRV_TIMER_IFLG_PAUSED 0x00010000 | |
fe1b26c9 | 26 | #define SNDRV_TIMER_IFLG_DEAD 0x00020000 |
9f8a7658 | 27 | |
8eeaa2f9 | 28 | #if IS_ENABLED(CONFIG_SND_HRTIMER) |
109fef9e | 29 | #define DEFAULT_TIMER_LIMIT 4 |
1da177e4 LT |
30 | #else |
31 | #define DEFAULT_TIMER_LIMIT 1 | |
32 | #endif | |
33 | ||
34 | static int timer_limit = DEFAULT_TIMER_LIMIT; | |
b751eef1 | 35 | static int timer_tstamp_monotonic = 1; |
c1017a4c | 36 | MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); |
1da177e4 LT |
37 | MODULE_DESCRIPTION("ALSA timer interface"); |
38 | MODULE_LICENSE("GPL"); | |
39 | module_param(timer_limit, int, 0444); | |
40 | MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); | |
b751eef1 JK |
41 | module_param(timer_tstamp_monotonic, int, 0444); |
42 | MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); | |
1da177e4 | 43 | |
03cfe6f5 KS |
44 | MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); |
45 | MODULE_ALIAS("devname:snd/timer"); | |
46 | ||
53d2f744 TI |
47 | struct snd_timer_user { |
48 | struct snd_timer_instance *timeri; | |
6b172a85 | 49 | int tread; /* enhanced read with timestamps and events */ |
1da177e4 LT |
50 | unsigned long ticks; |
51 | unsigned long overrun; | |
52 | int qhead; | |
53 | int qtail; | |
54 | int qused; | |
55 | int queue_size; | |
230323da | 56 | bool disconnected; |
53d2f744 TI |
57 | struct snd_timer_read *queue; |
58 | struct snd_timer_tread *tqueue; | |
1da177e4 LT |
59 | spinlock_t qlock; |
60 | unsigned long last_resolution; | |
61 | unsigned int filter; | |
62 | struct timespec tstamp; /* trigger tstamp */ | |
63 | wait_queue_head_t qchange_sleep; | |
64 | struct fasync_struct *fasync; | |
af368027 | 65 | struct mutex ioctl_lock; |
53d2f744 | 66 | }; |
1da177e4 LT |
67 | |
68 | /* list of timers */ | |
69 | static LIST_HEAD(snd_timer_list); | |
70 | ||
71 | /* list of slave instances */ | |
72 | static LIST_HEAD(snd_timer_slave_list); | |
73 | ||
74 | /* lock for slave active lists */ | |
75 | static DEFINE_SPINLOCK(slave_active_lock); | |
76 | ||
fdea53fe TI |
77 | #define MAX_SLAVE_INSTANCES 1000 |
78 | static int num_slaves; | |
79 | ||
1a60d4c5 | 80 | static DEFINE_MUTEX(register_mutex); |
1da177e4 | 81 | |
53d2f744 TI |
82 | static int snd_timer_free(struct snd_timer *timer); |
83 | static int snd_timer_dev_free(struct snd_device *device); | |
84 | static int snd_timer_dev_register(struct snd_device *device); | |
c461482c | 85 | static int snd_timer_dev_disconnect(struct snd_device *device); |
1da177e4 | 86 | |
53d2f744 | 87 | static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); |
1da177e4 LT |
88 | |
89 | /* | |
90 | * create a timer instance with the given owner string. | |
91 | * when timer is not NULL, increments the module counter | |
92 | */ | |
53d2f744 TI |
93 | static struct snd_timer_instance *snd_timer_instance_new(char *owner, |
94 | struct snd_timer *timer) | |
1da177e4 | 95 | { |
53d2f744 | 96 | struct snd_timer_instance *timeri; |
ca2c0966 | 97 | timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); |
1da177e4 LT |
98 | if (timeri == NULL) |
99 | return NULL; | |
543537bd | 100 | timeri->owner = kstrdup(owner, GFP_KERNEL); |
1da177e4 LT |
101 | if (! timeri->owner) { |
102 | kfree(timeri); | |
103 | return NULL; | |
104 | } | |
105 | INIT_LIST_HEAD(&timeri->open_list); | |
106 | INIT_LIST_HEAD(&timeri->active_list); | |
107 | INIT_LIST_HEAD(&timeri->ack_list); | |
108 | INIT_LIST_HEAD(&timeri->slave_list_head); | |
109 | INIT_LIST_HEAD(&timeri->slave_active_head); | |
110 | ||
111 | timeri->timer = timer; | |
de24214d | 112 | if (timer && !try_module_get(timer->module)) { |
1da177e4 LT |
113 | kfree(timeri->owner); |
114 | kfree(timeri); | |
115 | return NULL; | |
116 | } | |
117 | ||
118 | return timeri; | |
119 | } | |
120 | ||
121 | /* | |
122 | * find a timer instance from the given timer id | |
123 | */ | |
53d2f744 | 124 | static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) |
1da177e4 | 125 | { |
53d2f744 | 126 | struct snd_timer *timer = NULL; |
1da177e4 | 127 | |
9244b2c3 | 128 | list_for_each_entry(timer, &snd_timer_list, device_list) { |
1da177e4 LT |
129 | if (timer->tmr_class != tid->dev_class) |
130 | continue; | |
131 | if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || | |
132 | timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && | |
133 | (timer->card == NULL || | |
134 | timer->card->number != tid->card)) | |
135 | continue; | |
136 | if (timer->tmr_device != tid->device) | |
137 | continue; | |
138 | if (timer->tmr_subdevice != tid->subdevice) | |
139 | continue; | |
140 | return timer; | |
141 | } | |
142 | return NULL; | |
143 | } | |
144 | ||
ee2da997 | 145 | #ifdef CONFIG_MODULES |
1da177e4 | 146 | |
53d2f744 | 147 | static void snd_timer_request(struct snd_timer_id *tid) |
1da177e4 | 148 | { |
1da177e4 LT |
149 | switch (tid->dev_class) { |
150 | case SNDRV_TIMER_CLASS_GLOBAL: | |
151 | if (tid->device < timer_limit) | |
152 | request_module("snd-timer-%i", tid->device); | |
153 | break; | |
154 | case SNDRV_TIMER_CLASS_CARD: | |
155 | case SNDRV_TIMER_CLASS_PCM: | |
156 | if (tid->card < snd_ecards_limit) | |
157 | request_module("snd-card-%i", tid->card); | |
158 | break; | |
159 | default: | |
160 | break; | |
161 | } | |
162 | } | |
163 | ||
164 | #endif | |
165 | ||
ebfc6de2 TI |
166 | /* move the slave if it belongs to the master; return 1 if match */ |
167 | static int check_matching_master_slave(struct snd_timer_instance *master, | |
168 | struct snd_timer_instance *slave) | |
169 | { | |
170 | if (slave->slave_class != master->slave_class || | |
171 | slave->slave_id != master->slave_id) | |
172 | return 0; | |
173 | if (master->timer->num_instances >= master->timer->max_instances) | |
174 | return -EBUSY; | |
175 | list_move_tail(&slave->open_list, &master->slave_list_head); | |
176 | master->timer->num_instances++; | |
177 | spin_lock_irq(&slave_active_lock); | |
178 | spin_lock(&master->timer->lock); | |
179 | slave->master = master; | |
180 | slave->timer = master->timer; | |
181 | if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) | |
182 | list_add_tail(&slave->active_list, &master->slave_active_head); | |
183 | spin_unlock(&master->timer->lock); | |
184 | spin_unlock_irq(&slave_active_lock); | |
185 | return 1; | |
186 | } | |
187 | ||
1da177e4 LT |
188 | /* |
189 | * look for a master instance matching with the slave id of the given slave. | |
190 | * when found, relink the open_link of the slave. | |
191 | * | |
192 | * call this with register_mutex down. | |
193 | */ | |
9b7d869e | 194 | static int snd_timer_check_slave(struct snd_timer_instance *slave) |
1da177e4 | 195 | { |
53d2f744 TI |
196 | struct snd_timer *timer; |
197 | struct snd_timer_instance *master; | |
ebfc6de2 | 198 | int err = 0; |
1da177e4 LT |
199 | |
200 | /* FIXME: it's really dumb to look up all entries.. */ | |
9244b2c3 JB |
201 | list_for_each_entry(timer, &snd_timer_list, device_list) { |
202 | list_for_each_entry(master, &timer->open_list_head, open_list) { | |
ebfc6de2 TI |
203 | err = check_matching_master_slave(master, slave); |
204 | if (err != 0) /* match found or error */ | |
205 | goto out; | |
1da177e4 LT |
206 | } |
207 | } | |
ebfc6de2 TI |
208 | out: |
209 | return err < 0 ? err : 0; | |
1da177e4 LT |
210 | } |
211 | ||
212 | /* | |
213 | * look for slave instances matching with the slave id of the given master. | |
214 | * when found, relink the open_link of slaves. | |
215 | * | |
216 | * call this with register_mutex down. | |
217 | */ | |
9b7d869e | 218 | static int snd_timer_check_master(struct snd_timer_instance *master) |
1da177e4 | 219 | { |
9244b2c3 | 220 | struct snd_timer_instance *slave, *tmp; |
ebfc6de2 | 221 | int err = 0; |
1da177e4 LT |
222 | |
223 | /* check all pending slaves */ | |
9244b2c3 | 224 | list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { |
ebfc6de2 TI |
225 | err = check_matching_master_slave(master, slave); |
226 | if (err < 0) | |
227 | break; | |
1da177e4 | 228 | } |
ebfc6de2 | 229 | return err < 0 ? err : 0; |
1da177e4 LT |
230 | } |
231 | ||
33bbb8a0 TI |
232 | static void snd_timer_close_locked(struct snd_timer_instance *timeri, |
233 | struct device **card_devp_to_put); | |
9b7d869e | 234 | |
1da177e4 LT |
235 | /* |
236 | * open a timer instance | |
237 | * when opening a master, the slave id must be here given. | |
238 | */ | |
53d2f744 TI |
239 | int snd_timer_open(struct snd_timer_instance **ti, |
240 | char *owner, struct snd_timer_id *tid, | |
1da177e4 LT |
241 | unsigned int slave_id) |
242 | { | |
53d2f744 TI |
243 | struct snd_timer *timer; |
244 | struct snd_timer_instance *timeri = NULL; | |
a3933186 | 245 | struct device *card_dev_to_put = NULL; |
9b7d869e | 246 | int err; |
6b172a85 | 247 | |
41672c0c | 248 | mutex_lock(®ister_mutex); |
1da177e4 LT |
249 | if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { |
250 | /* open a slave instance */ | |
251 | if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || | |
252 | tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { | |
cf74dcf3 TI |
253 | pr_debug("ALSA: timer: invalid slave class %i\n", |
254 | tid->dev_sclass); | |
41672c0c TI |
255 | err = -EINVAL; |
256 | goto unlock; | |
1da177e4 | 257 | } |
fdea53fe TI |
258 | if (num_slaves >= MAX_SLAVE_INSTANCES) { |
259 | err = -EBUSY; | |
260 | goto unlock; | |
261 | } | |
1da177e4 | 262 | timeri = snd_timer_instance_new(owner, NULL); |
2fd43d11 | 263 | if (!timeri) { |
41672c0c TI |
264 | err = -ENOMEM; |
265 | goto unlock; | |
2fd43d11 | 266 | } |
1da177e4 LT |
267 | timeri->slave_class = tid->dev_sclass; |
268 | timeri->slave_id = tid->device; | |
269 | timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; | |
270 | list_add_tail(&timeri->open_list, &snd_timer_slave_list); | |
fdea53fe | 271 | num_slaves++; |
9b7d869e TI |
272 | err = snd_timer_check_slave(timeri); |
273 | if (err < 0) { | |
a3933186 | 274 | snd_timer_close_locked(timeri, &card_dev_to_put); |
9b7d869e TI |
275 | timeri = NULL; |
276 | } | |
41672c0c | 277 | goto unlock; |
1da177e4 LT |
278 | } |
279 | ||
280 | /* open a master instance */ | |
1da177e4 | 281 | timer = snd_timer_find(tid); |
ee2da997 JB |
282 | #ifdef CONFIG_MODULES |
283 | if (!timer) { | |
1a60d4c5 | 284 | mutex_unlock(®ister_mutex); |
1da177e4 | 285 | snd_timer_request(tid); |
1a60d4c5 | 286 | mutex_lock(®ister_mutex); |
1da177e4 LT |
287 | timer = snd_timer_find(tid); |
288 | } | |
289 | #endif | |
2fd43d11 | 290 | if (!timer) { |
41672c0c TI |
291 | err = -ENODEV; |
292 | goto unlock; | |
1da177e4 | 293 | } |
2fd43d11 | 294 | if (!list_empty(&timer->open_list_head)) { |
e7af6307 TI |
295 | struct snd_timer_instance *t = |
296 | list_entry(timer->open_list_head.next, | |
53d2f744 | 297 | struct snd_timer_instance, open_list); |
e7af6307 | 298 | if (t->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { |
41672c0c | 299 | err = -EBUSY; |
41672c0c | 300 | goto unlock; |
2fd43d11 CL |
301 | } |
302 | } | |
9b7d869e | 303 | if (timer->num_instances >= timer->max_instances) { |
41672c0c TI |
304 | err = -EBUSY; |
305 | goto unlock; | |
9b7d869e | 306 | } |
2fd43d11 CL |
307 | timeri = snd_timer_instance_new(owner, timer); |
308 | if (!timeri) { | |
41672c0c TI |
309 | err = -ENOMEM; |
310 | goto unlock; | |
2fd43d11 | 311 | } |
230323da TI |
312 | /* take a card refcount for safe disconnection */ |
313 | if (timer->card) | |
314 | get_device(&timer->card->card_dev); | |
2fd43d11 CL |
315 | timeri->slave_class = tid->dev_sclass; |
316 | timeri->slave_id = slave_id; | |
8ddc0563 VN |
317 | |
318 | if (list_empty(&timer->open_list_head) && timer->hw.open) { | |
41672c0c | 319 | err = timer->hw.open(timer); |
8ddc0563 VN |
320 | if (err) { |
321 | kfree(timeri->owner); | |
322 | kfree(timeri); | |
41672c0c | 323 | timeri = NULL; |
8ddc0563 VN |
324 | |
325 | if (timer->card) | |
a3933186 | 326 | card_dev_to_put = &timer->card->card_dev; |
8ddc0563 | 327 | module_put(timer->module); |
41672c0c | 328 | goto unlock; |
8ddc0563 VN |
329 | } |
330 | } | |
331 | ||
2fd43d11 | 332 | list_add_tail(&timeri->open_list, &timer->open_list_head); |
9b7d869e TI |
333 | timer->num_instances++; |
334 | err = snd_timer_check_master(timeri); | |
335 | if (err < 0) { | |
a3933186 | 336 | snd_timer_close_locked(timeri, &card_dev_to_put); |
9b7d869e TI |
337 | timeri = NULL; |
338 | } | |
41672c0c TI |
339 | |
340 | unlock: | |
1a60d4c5 | 341 | mutex_unlock(®ister_mutex); |
a3933186 TI |
342 | /* put_device() is called after unlock for avoiding deadlock */ |
343 | if (card_dev_to_put) | |
344 | put_device(card_dev_to_put); | |
1da177e4 | 345 | *ti = timeri; |
9b7d869e | 346 | return err; |
1da177e4 | 347 | } |
98856392 | 348 | EXPORT_SYMBOL(snd_timer_open); |
1da177e4 | 349 | |
1da177e4 LT |
350 | /* |
351 | * close a timer instance | |
9b7d869e | 352 | * call this with register_mutex down. |
1da177e4 | 353 | */ |
33bbb8a0 TI |
354 | static void snd_timer_close_locked(struct snd_timer_instance *timeri, |
355 | struct device **card_devp_to_put) | |
1da177e4 | 356 | { |
fe1b26c9 | 357 | struct snd_timer *timer = timeri->timer; |
9244b2c3 | 358 | struct snd_timer_instance *slave, *tmp; |
1da177e4 | 359 | |
fe1b26c9 TI |
360 | if (timer) { |
361 | spin_lock_irq(&timer->lock); | |
362 | timeri->flags |= SNDRV_TIMER_IFLG_DEAD; | |
363 | spin_unlock_irq(&timer->lock); | |
364 | } | |
365 | ||
9984d1b5 | 366 | list_del(&timeri->open_list); |
fdea53fe TI |
367 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) |
368 | num_slaves--; | |
9984d1b5 | 369 | |
1da177e4 LT |
370 | /* force to stop the timer */ |
371 | snd_timer_stop(timeri); | |
372 | ||
9984d1b5 | 373 | if (timer) { |
9b7d869e | 374 | timer->num_instances--; |
1da177e4 LT |
375 | /* wait, until the active callback is finished */ |
376 | spin_lock_irq(&timer->lock); | |
377 | while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { | |
378 | spin_unlock_irq(&timer->lock); | |
379 | udelay(10); | |
380 | spin_lock_irq(&timer->lock); | |
381 | } | |
382 | spin_unlock_irq(&timer->lock); | |
9984d1b5 | 383 | |
1da177e4 | 384 | /* remove slave links */ |
b5a663aa TI |
385 | spin_lock_irq(&slave_active_lock); |
386 | spin_lock(&timer->lock); | |
9244b2c3 JB |
387 | list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, |
388 | open_list) { | |
9244b2c3 | 389 | list_move_tail(&slave->open_list, &snd_timer_slave_list); |
9b7d869e | 390 | timer->num_instances--; |
1da177e4 LT |
391 | slave->master = NULL; |
392 | slave->timer = NULL; | |
b5a663aa TI |
393 | list_del_init(&slave->ack_list); |
394 | list_del_init(&slave->active_list); | |
1da177e4 | 395 | } |
b5a663aa TI |
396 | spin_unlock(&timer->lock); |
397 | spin_unlock_irq(&slave_active_lock); | |
9984d1b5 TI |
398 | |
399 | /* slave doesn't need to release timer resources below */ | |
400 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) | |
401 | timer = NULL; | |
1da177e4 | 402 | } |
9984d1b5 | 403 | |
1da177e4 LT |
404 | if (timeri->private_free) |
405 | timeri->private_free(timeri); | |
406 | kfree(timeri->owner); | |
407 | kfree(timeri); | |
9984d1b5 TI |
408 | |
409 | if (timer) { | |
410 | if (list_empty(&timer->open_list_head) && timer->hw.close) | |
411 | timer->hw.close(timer); | |
412 | /* release a card refcount for safe disconnection */ | |
413 | if (timer->card) | |
a3933186 | 414 | *card_devp_to_put = &timer->card->card_dev; |
de24214d | 415 | module_put(timer->module); |
9984d1b5 | 416 | } |
1da177e4 | 417 | } |
9b7d869e TI |
418 | |
419 | /* | |
420 | * close a timer instance | |
421 | */ | |
33bbb8a0 | 422 | void snd_timer_close(struct snd_timer_instance *timeri) |
9b7d869e | 423 | { |
a3933186 | 424 | struct device *card_dev_to_put = NULL; |
9b7d869e TI |
425 | |
426 | if (snd_BUG_ON(!timeri)) | |
33bbb8a0 | 427 | return; |
9b7d869e TI |
428 | |
429 | mutex_lock(®ister_mutex); | |
33bbb8a0 | 430 | snd_timer_close_locked(timeri, &card_dev_to_put); |
9b7d869e | 431 | mutex_unlock(®ister_mutex); |
a3933186 TI |
432 | /* put_device() is called after unlock for avoiding deadlock */ |
433 | if (card_dev_to_put) | |
434 | put_device(card_dev_to_put); | |
9b7d869e | 435 | } |
98856392 | 436 | EXPORT_SYMBOL(snd_timer_close); |
1da177e4 | 437 | |
fdcb5761 TI |
438 | static unsigned long snd_timer_hw_resolution(struct snd_timer *timer) |
439 | { | |
440 | if (timer->hw.c_resolution) | |
441 | return timer->hw.c_resolution(timer); | |
442 | else | |
443 | return timer->hw.resolution; | |
444 | } | |
445 | ||
53d2f744 | 446 | unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) |
1da177e4 | 447 | { |
53d2f744 | 448 | struct snd_timer * timer; |
9d4d207d TI |
449 | unsigned long ret = 0; |
450 | unsigned long flags; | |
1da177e4 LT |
451 | |
452 | if (timeri == NULL) | |
453 | return 0; | |
dd1f7ab8 | 454 | timer = timeri->timer; |
9d4d207d TI |
455 | if (timer) { |
456 | spin_lock_irqsave(&timer->lock, flags); | |
457 | ret = snd_timer_hw_resolution(timer); | |
458 | spin_unlock_irqrestore(&timer->lock, flags); | |
459 | } | |
460 | return ret; | |
1da177e4 | 461 | } |
98856392 | 462 | EXPORT_SYMBOL(snd_timer_resolution); |
1da177e4 | 463 | |
53d2f744 | 464 | static void snd_timer_notify1(struct snd_timer_instance *ti, int event) |
1da177e4 | 465 | { |
9d4d207d | 466 | struct snd_timer *timer = ti->timer; |
1da177e4 | 467 | unsigned long resolution = 0; |
53d2f744 | 468 | struct snd_timer_instance *ts; |
1da177e4 LT |
469 | struct timespec tstamp; |
470 | ||
b751eef1 | 471 | if (timer_tstamp_monotonic) |
26204e04 | 472 | ktime_get_ts(&tstamp); |
b751eef1 JK |
473 | else |
474 | getnstimeofday(&tstamp); | |
7eaa943c TI |
475 | if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || |
476 | event > SNDRV_TIMER_EVENT_PAUSE)) | |
477 | return; | |
9d4d207d TI |
478 | if (timer && |
479 | (event == SNDRV_TIMER_EVENT_START || | |
480 | event == SNDRV_TIMER_EVENT_CONTINUE)) | |
481 | resolution = snd_timer_hw_resolution(timer); | |
1da177e4 | 482 | if (ti->ccallback) |
b30477d5 | 483 | ti->ccallback(ti, event, &tstamp, resolution); |
1da177e4 LT |
484 | if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) |
485 | return; | |
1da177e4 LT |
486 | if (timer == NULL) |
487 | return; | |
488 | if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) | |
489 | return; | |
9244b2c3 | 490 | list_for_each_entry(ts, &ti->slave_active_head, active_list) |
1da177e4 | 491 | if (ts->ccallback) |
117159f0 | 492 | ts->ccallback(ts, event + 100, &tstamp, resolution); |
1da177e4 LT |
493 | } |
494 | ||
f65e0d29 TI |
495 | /* start/continue a master timer */ |
496 | static int snd_timer_start1(struct snd_timer_instance *timeri, | |
497 | bool start, unsigned long ticks) | |
1da177e4 | 498 | { |
f65e0d29 TI |
499 | struct snd_timer *timer; |
500 | int result; | |
501 | unsigned long flags; | |
502 | ||
503 | timer = timeri->timer; | |
504 | if (!timer) | |
505 | return -EINVAL; | |
506 | ||
507 | spin_lock_irqsave(&timer->lock, flags); | |
fe1b26c9 TI |
508 | if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) { |
509 | result = -EINVAL; | |
510 | goto unlock; | |
511 | } | |
f65e0d29 TI |
512 | if (timer->card && timer->card->shutdown) { |
513 | result = -ENODEV; | |
514 | goto unlock; | |
515 | } | |
516 | if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | | |
517 | SNDRV_TIMER_IFLG_START)) { | |
518 | result = -EBUSY; | |
519 | goto unlock; | |
520 | } | |
521 | ||
522 | if (start) | |
523 | timeri->ticks = timeri->cticks = ticks; | |
524 | else if (!timeri->cticks) | |
525 | timeri->cticks = 1; | |
526 | timeri->pticks = 0; | |
527 | ||
5b7c757d | 528 | list_move_tail(&timeri->active_list, &timer->active_list_head); |
1da177e4 LT |
529 | if (timer->running) { |
530 | if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) | |
531 | goto __start_now; | |
532 | timer->flags |= SNDRV_TIMER_FLG_RESCHED; | |
533 | timeri->flags |= SNDRV_TIMER_IFLG_START; | |
f65e0d29 | 534 | result = 1; /* delayed start */ |
1da177e4 | 535 | } else { |
f65e0d29 TI |
536 | if (start) |
537 | timer->sticks = ticks; | |
1da177e4 LT |
538 | timer->hw.start(timer); |
539 | __start_now: | |
540 | timer->running++; | |
541 | timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; | |
f65e0d29 | 542 | result = 0; |
1da177e4 | 543 | } |
f65e0d29 TI |
544 | snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : |
545 | SNDRV_TIMER_EVENT_CONTINUE); | |
546 | unlock: | |
547 | spin_unlock_irqrestore(&timer->lock, flags); | |
548 | return result; | |
1da177e4 LT |
549 | } |
550 | ||
f65e0d29 TI |
551 | /* start/continue a slave timer */ |
552 | static int snd_timer_start_slave(struct snd_timer_instance *timeri, | |
553 | bool start) | |
1da177e4 LT |
554 | { |
555 | unsigned long flags; | |
fe1b26c9 | 556 | int err; |
1da177e4 LT |
557 | |
558 | spin_lock_irqsave(&slave_active_lock, flags); | |
fe1b26c9 TI |
559 | if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) { |
560 | err = -EINVAL; | |
561 | goto unlock; | |
562 | } | |
f784beb7 | 563 | if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) { |
fe1b26c9 TI |
564 | err = -EBUSY; |
565 | goto unlock; | |
f784beb7 | 566 | } |
1da177e4 | 567 | timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; |
b5a663aa TI |
568 | if (timeri->master && timeri->timer) { |
569 | spin_lock(&timeri->timer->lock); | |
6b172a85 CL |
570 | list_add_tail(&timeri->active_list, |
571 | &timeri->master->slave_active_head); | |
f65e0d29 TI |
572 | snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : |
573 | SNDRV_TIMER_EVENT_CONTINUE); | |
b5a663aa TI |
574 | spin_unlock(&timeri->timer->lock); |
575 | } | |
fe1b26c9 TI |
576 | err = 1; /* delayed start */ |
577 | unlock: | |
1da177e4 | 578 | spin_unlock_irqrestore(&slave_active_lock, flags); |
fe1b26c9 | 579 | return err; |
1da177e4 LT |
580 | } |
581 | ||
f65e0d29 TI |
582 | /* stop/pause a master timer */ |
583 | static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop) | |
1da177e4 | 584 | { |
53d2f744 | 585 | struct snd_timer *timer; |
f65e0d29 | 586 | int result = 0; |
1da177e4 LT |
587 | unsigned long flags; |
588 | ||
1da177e4 LT |
589 | timer = timeri->timer; |
590 | if (!timer) | |
591 | return -EINVAL; | |
592 | spin_lock_irqsave(&timer->lock, flags); | |
f784beb7 TI |
593 | if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | |
594 | SNDRV_TIMER_IFLG_START))) { | |
f65e0d29 TI |
595 | result = -EBUSY; |
596 | goto unlock; | |
f784beb7 | 597 | } |
1da177e4 LT |
598 | list_del_init(&timeri->ack_list); |
599 | list_del_init(&timeri->active_list); | |
f65e0d29 TI |
600 | if (timer->card && timer->card->shutdown) |
601 | goto unlock; | |
602 | if (stop) { | |
603 | timeri->cticks = timeri->ticks; | |
604 | timeri->pticks = 0; | |
230323da | 605 | } |
1da177e4 LT |
606 | if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && |
607 | !(--timer->running)) { | |
608 | timer->hw.stop(timer); | |
609 | if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { | |
610 | timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; | |
611 | snd_timer_reschedule(timer, 0); | |
612 | if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { | |
613 | timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; | |
614 | timer->hw.start(timer); | |
615 | } | |
616 | } | |
617 | } | |
c3b16813 | 618 | timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); |
9f8a7658 TI |
619 | if (stop) |
620 | timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED; | |
621 | else | |
622 | timeri->flags |= SNDRV_TIMER_IFLG_PAUSED; | |
f65e0d29 | 623 | snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP : |
3ae18097 | 624 | SNDRV_TIMER_EVENT_PAUSE); |
f65e0d29 | 625 | unlock: |
1da177e4 | 626 | spin_unlock_irqrestore(&timer->lock, flags); |
f65e0d29 TI |
627 | return result; |
628 | } | |
629 | ||
630 | /* stop/pause a slave timer */ | |
631 | static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop) | |
632 | { | |
633 | unsigned long flags; | |
634 | ||
635 | spin_lock_irqsave(&slave_active_lock, flags); | |
636 | if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) { | |
637 | spin_unlock_irqrestore(&slave_active_lock, flags); | |
638 | return -EBUSY; | |
639 | } | |
640 | timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; | |
641 | if (timeri->timer) { | |
642 | spin_lock(&timeri->timer->lock); | |
643 | list_del_init(&timeri->ack_list); | |
644 | list_del_init(&timeri->active_list); | |
645 | snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP : | |
3ae18097 | 646 | SNDRV_TIMER_EVENT_PAUSE); |
f65e0d29 TI |
647 | spin_unlock(&timeri->timer->lock); |
648 | } | |
649 | spin_unlock_irqrestore(&slave_active_lock, flags); | |
1da177e4 LT |
650 | return 0; |
651 | } | |
652 | ||
f65e0d29 TI |
653 | /* |
654 | * start the timer instance | |
655 | */ | |
656 | int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) | |
657 | { | |
658 | if (timeri == NULL || ticks < 1) | |
659 | return -EINVAL; | |
660 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) | |
661 | return snd_timer_start_slave(timeri, true); | |
662 | else | |
663 | return snd_timer_start1(timeri, true, ticks); | |
664 | } | |
98856392 | 665 | EXPORT_SYMBOL(snd_timer_start); |
f65e0d29 | 666 | |
1da177e4 LT |
667 | /* |
668 | * stop the timer instance. | |
669 | * | |
670 | * do not call this from the timer callback! | |
671 | */ | |
53d2f744 | 672 | int snd_timer_stop(struct snd_timer_instance *timeri) |
1da177e4 | 673 | { |
f65e0d29 TI |
674 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) |
675 | return snd_timer_stop_slave(timeri, true); | |
676 | else | |
677 | return snd_timer_stop1(timeri, true); | |
1da177e4 | 678 | } |
98856392 | 679 | EXPORT_SYMBOL(snd_timer_stop); |
1da177e4 LT |
680 | |
681 | /* | |
682 | * start again.. the tick is kept. | |
683 | */ | |
53d2f744 | 684 | int snd_timer_continue(struct snd_timer_instance *timeri) |
1da177e4 | 685 | { |
9f8a7658 TI |
686 | /* timer can continue only after pause */ |
687 | if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED)) | |
688 | return -EINVAL; | |
689 | ||
1da177e4 | 690 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) |
f65e0d29 TI |
691 | return snd_timer_start_slave(timeri, false); |
692 | else | |
693 | return snd_timer_start1(timeri, false, 0); | |
1da177e4 | 694 | } |
98856392 | 695 | EXPORT_SYMBOL(snd_timer_continue); |
1da177e4 LT |
696 | |
697 | /* | |
698 | * pause.. remember the ticks left | |
699 | */ | |
53d2f744 | 700 | int snd_timer_pause(struct snd_timer_instance * timeri) |
1da177e4 | 701 | { |
f65e0d29 TI |
702 | if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) |
703 | return snd_timer_stop_slave(timeri, false); | |
704 | else | |
705 | return snd_timer_stop1(timeri, false); | |
1da177e4 | 706 | } |
98856392 | 707 | EXPORT_SYMBOL(snd_timer_pause); |
1da177e4 LT |
708 | |
709 | /* | |
710 | * reschedule the timer | |
711 | * | |
712 | * start pending instances and check the scheduling ticks. | |
713 | * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. | |
714 | */ | |
53d2f744 | 715 | static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) |
1da177e4 | 716 | { |
53d2f744 | 717 | struct snd_timer_instance *ti; |
1da177e4 | 718 | unsigned long ticks = ~0UL; |
1da177e4 | 719 | |
9244b2c3 | 720 | list_for_each_entry(ti, &timer->active_list_head, active_list) { |
1da177e4 LT |
721 | if (ti->flags & SNDRV_TIMER_IFLG_START) { |
722 | ti->flags &= ~SNDRV_TIMER_IFLG_START; | |
723 | ti->flags |= SNDRV_TIMER_IFLG_RUNNING; | |
724 | timer->running++; | |
725 | } | |
726 | if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { | |
727 | if (ticks > ti->cticks) | |
728 | ticks = ti->cticks; | |
729 | } | |
730 | } | |
731 | if (ticks == ~0UL) { | |
732 | timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; | |
733 | return; | |
734 | } | |
735 | if (ticks > timer->hw.ticks) | |
736 | ticks = timer->hw.ticks; | |
737 | if (ticks_left != ticks) | |
738 | timer->flags |= SNDRV_TIMER_FLG_CHANGE; | |
739 | timer->sticks = ticks; | |
740 | } | |
741 | ||
8748b850 TI |
742 | /* call callbacks in timer ack list */ |
743 | static void snd_timer_process_callbacks(struct snd_timer *timer, | |
744 | struct list_head *head) | |
1da177e4 | 745 | { |
53d2f744 | 746 | struct snd_timer_instance *ti; |
1da177e4 | 747 | unsigned long resolution, ticks; |
230323da | 748 | |
8748b850 TI |
749 | while (!list_empty(head)) { |
750 | ti = list_first_entry(head, struct snd_timer_instance, | |
751 | ack_list); | |
1da177e4 | 752 | |
df55531b TI |
753 | /* remove from ack_list and make empty */ |
754 | list_del_init(&ti->ack_list); | |
755 | ||
fe1b26c9 TI |
756 | if (!(ti->flags & SNDRV_TIMER_IFLG_DEAD)) { |
757 | ticks = ti->pticks; | |
758 | ti->pticks = 0; | |
759 | resolution = ti->resolution; | |
df55531b | 760 | ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; |
fe1b26c9 TI |
761 | spin_unlock(&timer->lock); |
762 | if (ti->callback) | |
763 | ti->callback(ti, resolution, ticks); | |
764 | spin_lock(&timer->lock); | |
df55531b | 765 | ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; |
fe1b26c9 | 766 | } |
1da177e4 | 767 | } |
8748b850 TI |
768 | } |
769 | ||
7bb4a8a2 TI |
770 | /* clear pending instances from ack list */ |
771 | static void snd_timer_clear_callbacks(struct snd_timer *timer, | |
772 | struct list_head *head) | |
773 | { | |
774 | unsigned long flags; | |
775 | ||
776 | spin_lock_irqsave(&timer->lock, flags); | |
777 | while (!list_empty(head)) | |
778 | list_del_init(head->next); | |
779 | spin_unlock_irqrestore(&timer->lock, flags); | |
780 | } | |
781 | ||
1da177e4 LT |
782 | /* |
783 | * timer tasklet | |
784 | * | |
785 | */ | |
786 | static void snd_timer_tasklet(unsigned long arg) | |
787 | { | |
53d2f744 | 788 | struct snd_timer *timer = (struct snd_timer *) arg; |
2999ff5b | 789 | unsigned long flags; |
1da177e4 | 790 | |
7bb4a8a2 TI |
791 | if (timer->card && timer->card->shutdown) { |
792 | snd_timer_clear_callbacks(timer, &timer->sack_list_head); | |
230323da | 793 | return; |
7bb4a8a2 | 794 | } |
230323da | 795 | |
2999ff5b | 796 | spin_lock_irqsave(&timer->lock, flags); |
8748b850 | 797 | snd_timer_process_callbacks(timer, &timer->sack_list_head); |
2999ff5b | 798 | spin_unlock_irqrestore(&timer->lock, flags); |
1da177e4 LT |
799 | } |
800 | ||
801 | /* | |
802 | * timer interrupt | |
803 | * | |
804 | * ticks_left is usually equal to timer->sticks. | |
805 | * | |
806 | */ | |
53d2f744 | 807 | void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) |
1da177e4 | 808 | { |
9244b2c3 | 809 | struct snd_timer_instance *ti, *ts, *tmp; |
8748b850 TI |
810 | unsigned long resolution; |
811 | struct list_head *ack_list_head; | |
b32425ac | 812 | unsigned long flags; |
1da177e4 LT |
813 | int use_tasklet = 0; |
814 | ||
815 | if (timer == NULL) | |
816 | return; | |
817 | ||
7bb4a8a2 TI |
818 | if (timer->card && timer->card->shutdown) { |
819 | snd_timer_clear_callbacks(timer, &timer->ack_list_head); | |
230323da | 820 | return; |
7bb4a8a2 | 821 | } |
230323da | 822 | |
b32425ac | 823 | spin_lock_irqsave(&timer->lock, flags); |
1da177e4 LT |
824 | |
825 | /* remember the current resolution */ | |
fdcb5761 | 826 | resolution = snd_timer_hw_resolution(timer); |
1da177e4 LT |
827 | |
828 | /* loop for all active instances | |
9244b2c3 | 829 | * Here we cannot use list_for_each_entry because the active_list of a |
6b172a85 CL |
830 | * processed instance is relinked to done_list_head before the callback |
831 | * is called. | |
1da177e4 | 832 | */ |
9244b2c3 JB |
833 | list_for_each_entry_safe(ti, tmp, &timer->active_list_head, |
834 | active_list) { | |
fe1b26c9 TI |
835 | if (ti->flags & SNDRV_TIMER_IFLG_DEAD) |
836 | continue; | |
1da177e4 LT |
837 | if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) |
838 | continue; | |
839 | ti->pticks += ticks_left; | |
840 | ti->resolution = resolution; | |
841 | if (ti->cticks < ticks_left) | |
842 | ti->cticks = 0; | |
843 | else | |
844 | ti->cticks -= ticks_left; | |
845 | if (ti->cticks) /* not expired */ | |
846 | continue; | |
847 | if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { | |
848 | ti->cticks = ti->ticks; | |
849 | } else { | |
850 | ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; | |
094fd3be TI |
851 | --timer->running; |
852 | list_del_init(&ti->active_list); | |
1da177e4 | 853 | } |
6b172a85 CL |
854 | if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || |
855 | (ti->flags & SNDRV_TIMER_IFLG_FAST)) | |
856 | ack_list_head = &timer->ack_list_head; | |
857 | else | |
858 | ack_list_head = &timer->sack_list_head; | |
859 | if (list_empty(&ti->ack_list)) | |
860 | list_add_tail(&ti->ack_list, ack_list_head); | |
9244b2c3 | 861 | list_for_each_entry(ts, &ti->slave_active_head, active_list) { |
1da177e4 LT |
862 | ts->pticks = ti->pticks; |
863 | ts->resolution = resolution; | |
6b172a85 CL |
864 | if (list_empty(&ts->ack_list)) |
865 | list_add_tail(&ts->ack_list, ack_list_head); | |
1da177e4 LT |
866 | } |
867 | } | |
868 | if (timer->flags & SNDRV_TIMER_FLG_RESCHED) | |
cd93fe47 | 869 | snd_timer_reschedule(timer, timer->sticks); |
1da177e4 LT |
870 | if (timer->running) { |
871 | if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { | |
872 | timer->hw.stop(timer); | |
873 | timer->flags |= SNDRV_TIMER_FLG_CHANGE; | |
874 | } | |
875 | if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || | |
876 | (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { | |
877 | /* restart timer */ | |
878 | timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; | |
879 | timer->hw.start(timer); | |
880 | } | |
881 | } else { | |
882 | timer->hw.stop(timer); | |
883 | } | |
884 | ||
885 | /* now process all fast callbacks */ | |
8748b850 | 886 | snd_timer_process_callbacks(timer, &timer->ack_list_head); |
1da177e4 LT |
887 | |
888 | /* do we have any slow callbacks? */ | |
889 | use_tasklet = !list_empty(&timer->sack_list_head); | |
b32425ac | 890 | spin_unlock_irqrestore(&timer->lock, flags); |
1da177e4 LT |
891 | |
892 | if (use_tasklet) | |
1f04128a | 893 | tasklet_schedule(&timer->task_queue); |
1da177e4 | 894 | } |
98856392 | 895 | EXPORT_SYMBOL(snd_timer_interrupt); |
1da177e4 LT |
896 | |
897 | /* | |
898 | ||
899 | */ | |
900 | ||
53d2f744 TI |
901 | int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, |
902 | struct snd_timer **rtimer) | |
1da177e4 | 903 | { |
53d2f744 | 904 | struct snd_timer *timer; |
1da177e4 | 905 | int err; |
53d2f744 | 906 | static struct snd_device_ops ops = { |
1da177e4 LT |
907 | .dev_free = snd_timer_dev_free, |
908 | .dev_register = snd_timer_dev_register, | |
c461482c | 909 | .dev_disconnect = snd_timer_dev_disconnect, |
1da177e4 LT |
910 | }; |
911 | ||
7eaa943c TI |
912 | if (snd_BUG_ON(!tid)) |
913 | return -EINVAL; | |
d10ee9c5 S |
914 | if (tid->dev_class == SNDRV_TIMER_CLASS_CARD || |
915 | tid->dev_class == SNDRV_TIMER_CLASS_PCM) { | |
916 | if (WARN_ON(!card)) | |
917 | return -EINVAL; | |
918 | } | |
7eaa943c TI |
919 | if (rtimer) |
920 | *rtimer = NULL; | |
ca2c0966 | 921 | timer = kzalloc(sizeof(*timer), GFP_KERNEL); |
ec0e9937 | 922 | if (!timer) |
1da177e4 LT |
923 | return -ENOMEM; |
924 | timer->tmr_class = tid->dev_class; | |
925 | timer->card = card; | |
926 | timer->tmr_device = tid->device; | |
927 | timer->tmr_subdevice = tid->subdevice; | |
928 | if (id) | |
929 | strlcpy(timer->id, id, sizeof(timer->id)); | |
6b760bb2 | 930 | timer->sticks = 1; |
1da177e4 LT |
931 | INIT_LIST_HEAD(&timer->device_list); |
932 | INIT_LIST_HEAD(&timer->open_list_head); | |
933 | INIT_LIST_HEAD(&timer->active_list_head); | |
934 | INIT_LIST_HEAD(&timer->ack_list_head); | |
935 | INIT_LIST_HEAD(&timer->sack_list_head); | |
936 | spin_lock_init(&timer->lock); | |
6b172a85 CL |
937 | tasklet_init(&timer->task_queue, snd_timer_tasklet, |
938 | (unsigned long)timer); | |
9b7d869e | 939 | timer->max_instances = 1000; /* default limit per timer */ |
1da177e4 | 940 | if (card != NULL) { |
de24214d | 941 | timer->module = card->module; |
6b172a85 CL |
942 | err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); |
943 | if (err < 0) { | |
1da177e4 LT |
944 | snd_timer_free(timer); |
945 | return err; | |
946 | } | |
947 | } | |
7eaa943c TI |
948 | if (rtimer) |
949 | *rtimer = timer; | |
1da177e4 LT |
950 | return 0; |
951 | } | |
98856392 | 952 | EXPORT_SYMBOL(snd_timer_new); |
1da177e4 | 953 | |
53d2f744 | 954 | static int snd_timer_free(struct snd_timer *timer) |
1da177e4 | 955 | { |
7eaa943c TI |
956 | if (!timer) |
957 | return 0; | |
c461482c TI |
958 | |
959 | mutex_lock(®ister_mutex); | |
960 | if (! list_empty(&timer->open_list_head)) { | |
961 | struct list_head *p, *n; | |
962 | struct snd_timer_instance *ti; | |
cf74dcf3 | 963 | pr_warn("ALSA: timer %p is busy?\n", timer); |
c461482c TI |
964 | list_for_each_safe(p, n, &timer->open_list_head) { |
965 | list_del_init(p); | |
966 | ti = list_entry(p, struct snd_timer_instance, open_list); | |
967 | ti->timer = NULL; | |
968 | } | |
969 | } | |
970 | list_del(&timer->device_list); | |
971 | mutex_unlock(®ister_mutex); | |
972 | ||
1da177e4 LT |
973 | if (timer->private_free) |
974 | timer->private_free(timer); | |
975 | kfree(timer); | |
976 | return 0; | |
977 | } | |
978 | ||
53d2f744 | 979 | static int snd_timer_dev_free(struct snd_device *device) |
1da177e4 | 980 | { |
53d2f744 | 981 | struct snd_timer *timer = device->device_data; |
1da177e4 LT |
982 | return snd_timer_free(timer); |
983 | } | |
984 | ||
53d2f744 | 985 | static int snd_timer_dev_register(struct snd_device *dev) |
1da177e4 | 986 | { |
53d2f744 TI |
987 | struct snd_timer *timer = dev->device_data; |
988 | struct snd_timer *timer1; | |
1da177e4 | 989 | |
7eaa943c TI |
990 | if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) |
991 | return -ENXIO; | |
1da177e4 LT |
992 | if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && |
993 | !timer->hw.resolution && timer->hw.c_resolution == NULL) | |
994 | return -EINVAL; | |
995 | ||
1a60d4c5 | 996 | mutex_lock(®ister_mutex); |
9244b2c3 | 997 | list_for_each_entry(timer1, &snd_timer_list, device_list) { |
1da177e4 LT |
998 | if (timer1->tmr_class > timer->tmr_class) |
999 | break; | |
1000 | if (timer1->tmr_class < timer->tmr_class) | |
1001 | continue; | |
1002 | if (timer1->card && timer->card) { | |
1003 | if (timer1->card->number > timer->card->number) | |
1004 | break; | |
1005 | if (timer1->card->number < timer->card->number) | |
1006 | continue; | |
1007 | } | |
1008 | if (timer1->tmr_device > timer->tmr_device) | |
1009 | break; | |
1010 | if (timer1->tmr_device < timer->tmr_device) | |
1011 | continue; | |
1012 | if (timer1->tmr_subdevice > timer->tmr_subdevice) | |
1013 | break; | |
1014 | if (timer1->tmr_subdevice < timer->tmr_subdevice) | |
1015 | continue; | |
1016 | /* conflicts.. */ | |
1a60d4c5 | 1017 | mutex_unlock(®ister_mutex); |
1da177e4 LT |
1018 | return -EBUSY; |
1019 | } | |
9244b2c3 | 1020 | list_add_tail(&timer->device_list, &timer1->device_list); |
1a60d4c5 | 1021 | mutex_unlock(®ister_mutex); |
1da177e4 LT |
1022 | return 0; |
1023 | } | |
1024 | ||
c461482c | 1025 | static int snd_timer_dev_disconnect(struct snd_device *device) |
1da177e4 | 1026 | { |
c461482c | 1027 | struct snd_timer *timer = device->device_data; |
230323da TI |
1028 | struct snd_timer_instance *ti; |
1029 | ||
1a60d4c5 | 1030 | mutex_lock(®ister_mutex); |
c461482c | 1031 | list_del_init(&timer->device_list); |
230323da TI |
1032 | /* wake up pending sleepers */ |
1033 | list_for_each_entry(ti, &timer->open_list_head, open_list) { | |
40ed9444 TI |
1034 | if (ti->disconnect) |
1035 | ti->disconnect(ti); | |
230323da | 1036 | } |
1a60d4c5 | 1037 | mutex_unlock(®ister_mutex); |
c461482c | 1038 | return 0; |
1da177e4 LT |
1039 | } |
1040 | ||
53d2f744 | 1041 | void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) |
1da177e4 LT |
1042 | { |
1043 | unsigned long flags; | |
1044 | unsigned long resolution = 0; | |
53d2f744 | 1045 | struct snd_timer_instance *ti, *ts; |
1da177e4 | 1046 | |
230323da TI |
1047 | if (timer->card && timer->card->shutdown) |
1048 | return; | |
7c22f1aa TI |
1049 | if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) |
1050 | return; | |
7eaa943c TI |
1051 | if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || |
1052 | event > SNDRV_TIMER_EVENT_MRESUME)) | |
1053 | return; | |
1da177e4 | 1054 | spin_lock_irqsave(&timer->lock, flags); |
a501dfa3 JK |
1055 | if (event == SNDRV_TIMER_EVENT_MSTART || |
1056 | event == SNDRV_TIMER_EVENT_MCONTINUE || | |
fdcb5761 TI |
1057 | event == SNDRV_TIMER_EVENT_MRESUME) |
1058 | resolution = snd_timer_hw_resolution(timer); | |
9244b2c3 | 1059 | list_for_each_entry(ti, &timer->active_list_head, active_list) { |
1da177e4 LT |
1060 | if (ti->ccallback) |
1061 | ti->ccallback(ti, event, tstamp, resolution); | |
9244b2c3 | 1062 | list_for_each_entry(ts, &ti->slave_active_head, active_list) |
1da177e4 LT |
1063 | if (ts->ccallback) |
1064 | ts->ccallback(ts, event, tstamp, resolution); | |
1da177e4 LT |
1065 | } |
1066 | spin_unlock_irqrestore(&timer->lock, flags); | |
1067 | } | |
98856392 | 1068 | EXPORT_SYMBOL(snd_timer_notify); |
1da177e4 LT |
1069 | |
1070 | /* | |
1071 | * exported functions for global timers | |
1072 | */ | |
53d2f744 | 1073 | int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) |
1da177e4 | 1074 | { |
53d2f744 | 1075 | struct snd_timer_id tid; |
6b172a85 | 1076 | |
1da177e4 LT |
1077 | tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; |
1078 | tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; | |
1079 | tid.card = -1; | |
1080 | tid.device = device; | |
1081 | tid.subdevice = 0; | |
1082 | return snd_timer_new(NULL, id, &tid, rtimer); | |
1083 | } | |
98856392 | 1084 | EXPORT_SYMBOL(snd_timer_global_new); |
1da177e4 | 1085 | |
53d2f744 | 1086 | int snd_timer_global_free(struct snd_timer *timer) |
1da177e4 LT |
1087 | { |
1088 | return snd_timer_free(timer); | |
1089 | } | |
98856392 | 1090 | EXPORT_SYMBOL(snd_timer_global_free); |
1da177e4 | 1091 | |
53d2f744 | 1092 | int snd_timer_global_register(struct snd_timer *timer) |
1da177e4 | 1093 | { |
53d2f744 | 1094 | struct snd_device dev; |
1da177e4 LT |
1095 | |
1096 | memset(&dev, 0, sizeof(dev)); | |
1097 | dev.device_data = timer; | |
1098 | return snd_timer_dev_register(&dev); | |
1099 | } | |
98856392 | 1100 | EXPORT_SYMBOL(snd_timer_global_register); |
1da177e4 | 1101 | |
6b172a85 | 1102 | /* |
1da177e4 LT |
1103 | * System timer |
1104 | */ | |
1105 | ||
1106 | struct snd_timer_system_private { | |
1107 | struct timer_list tlist; | |
38e9a80f | 1108 | struct snd_timer *snd_timer; |
1da177e4 LT |
1109 | unsigned long last_expires; |
1110 | unsigned long last_jiffies; | |
1111 | unsigned long correction; | |
1112 | }; | |
1113 | ||
38e9a80f | 1114 | static void snd_timer_s_function(struct timer_list *t) |
1da177e4 | 1115 | { |
38e9a80f KC |
1116 | struct snd_timer_system_private *priv = from_timer(priv, t, |
1117 | tlist); | |
1118 | struct snd_timer *timer = priv->snd_timer; | |
1da177e4 LT |
1119 | unsigned long jiff = jiffies; |
1120 | if (time_after(jiff, priv->last_expires)) | |
6ed5eff0 | 1121 | priv->correction += (long)jiff - (long)priv->last_expires; |
1da177e4 LT |
1122 | snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); |
1123 | } | |
1124 | ||
53d2f744 | 1125 | static int snd_timer_s_start(struct snd_timer * timer) |
1da177e4 LT |
1126 | { |
1127 | struct snd_timer_system_private *priv; | |
1128 | unsigned long njiff; | |
1129 | ||
1130 | priv = (struct snd_timer_system_private *) timer->private_data; | |
1131 | njiff = (priv->last_jiffies = jiffies); | |
1132 | if (priv->correction > timer->sticks - 1) { | |
1133 | priv->correction -= timer->sticks - 1; | |
1134 | njiff++; | |
1135 | } else { | |
1136 | njiff += timer->sticks - priv->correction; | |
17f48ec3 | 1137 | priv->correction = 0; |
1da177e4 | 1138 | } |
4a07083e TI |
1139 | priv->last_expires = njiff; |
1140 | mod_timer(&priv->tlist, njiff); | |
1da177e4 LT |
1141 | return 0; |
1142 | } | |
1143 | ||
53d2f744 | 1144 | static int snd_timer_s_stop(struct snd_timer * timer) |
1da177e4 LT |
1145 | { |
1146 | struct snd_timer_system_private *priv; | |
1147 | unsigned long jiff; | |
1148 | ||
1149 | priv = (struct snd_timer_system_private *) timer->private_data; | |
1150 | del_timer(&priv->tlist); | |
1151 | jiff = jiffies; | |
1152 | if (time_before(jiff, priv->last_expires)) | |
1153 | timer->sticks = priv->last_expires - jiff; | |
1154 | else | |
1155 | timer->sticks = 1; | |
de2696d8 | 1156 | priv->correction = 0; |
1da177e4 LT |
1157 | return 0; |
1158 | } | |
1159 | ||
f146357f TI |
1160 | static int snd_timer_s_close(struct snd_timer *timer) |
1161 | { | |
1162 | struct snd_timer_system_private *priv; | |
1163 | ||
1164 | priv = (struct snd_timer_system_private *)timer->private_data; | |
1165 | del_timer_sync(&priv->tlist); | |
1166 | return 0; | |
1167 | } | |
1168 | ||
53d2f744 | 1169 | static struct snd_timer_hardware snd_timer_system = |
1da177e4 LT |
1170 | { |
1171 | .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, | |
1172 | .resolution = 1000000000L / HZ, | |
1173 | .ticks = 10000000L, | |
f146357f | 1174 | .close = snd_timer_s_close, |
1da177e4 LT |
1175 | .start = snd_timer_s_start, |
1176 | .stop = snd_timer_s_stop | |
1177 | }; | |
1178 | ||
53d2f744 | 1179 | static void snd_timer_free_system(struct snd_timer *timer) |
1da177e4 LT |
1180 | { |
1181 | kfree(timer->private_data); | |
1182 | } | |
1183 | ||
1184 | static int snd_timer_register_system(void) | |
1185 | { | |
53d2f744 | 1186 | struct snd_timer *timer; |
1da177e4 LT |
1187 | struct snd_timer_system_private *priv; |
1188 | int err; | |
1189 | ||
6b172a85 CL |
1190 | err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); |
1191 | if (err < 0) | |
1da177e4 LT |
1192 | return err; |
1193 | strcpy(timer->name, "system timer"); | |
1194 | timer->hw = snd_timer_system; | |
ca2c0966 | 1195 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
1da177e4 LT |
1196 | if (priv == NULL) { |
1197 | snd_timer_free(timer); | |
1198 | return -ENOMEM; | |
1199 | } | |
38e9a80f KC |
1200 | priv->snd_timer = timer; |
1201 | timer_setup(&priv->tlist, snd_timer_s_function, 0); | |
1da177e4 LT |
1202 | timer->private_data = priv; |
1203 | timer->private_free = snd_timer_free_system; | |
1204 | return snd_timer_global_register(timer); | |
1205 | } | |
1206 | ||
cd6a6503 | 1207 | #ifdef CONFIG_SND_PROC_FS |
1da177e4 LT |
1208 | /* |
1209 | * Info interface | |
1210 | */ | |
1211 | ||
53d2f744 TI |
1212 | static void snd_timer_proc_read(struct snd_info_entry *entry, |
1213 | struct snd_info_buffer *buffer) | |
1da177e4 | 1214 | { |
53d2f744 TI |
1215 | struct snd_timer *timer; |
1216 | struct snd_timer_instance *ti; | |
1da177e4 | 1217 | |
1a60d4c5 | 1218 | mutex_lock(®ister_mutex); |
9244b2c3 | 1219 | list_for_each_entry(timer, &snd_timer_list, device_list) { |
230323da TI |
1220 | if (timer->card && timer->card->shutdown) |
1221 | continue; | |
1da177e4 LT |
1222 | switch (timer->tmr_class) { |
1223 | case SNDRV_TIMER_CLASS_GLOBAL: | |
1224 | snd_iprintf(buffer, "G%i: ", timer->tmr_device); | |
1225 | break; | |
1226 | case SNDRV_TIMER_CLASS_CARD: | |
6b172a85 CL |
1227 | snd_iprintf(buffer, "C%i-%i: ", |
1228 | timer->card->number, timer->tmr_device); | |
1da177e4 LT |
1229 | break; |
1230 | case SNDRV_TIMER_CLASS_PCM: | |
6b172a85 CL |
1231 | snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, |
1232 | timer->tmr_device, timer->tmr_subdevice); | |
1da177e4 LT |
1233 | break; |
1234 | default: | |
6b172a85 CL |
1235 | snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, |
1236 | timer->card ? timer->card->number : -1, | |
1237 | timer->tmr_device, timer->tmr_subdevice); | |
1da177e4 LT |
1238 | } |
1239 | snd_iprintf(buffer, "%s :", timer->name); | |
1240 | if (timer->hw.resolution) | |
6b172a85 CL |
1241 | snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", |
1242 | timer->hw.resolution / 1000, | |
1243 | timer->hw.resolution % 1000, | |
1244 | timer->hw.ticks); | |
1da177e4 LT |
1245 | if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) |
1246 | snd_iprintf(buffer, " SLAVE"); | |
1247 | snd_iprintf(buffer, "\n"); | |
9244b2c3 | 1248 | list_for_each_entry(ti, &timer->open_list_head, open_list) |
6b172a85 CL |
1249 | snd_iprintf(buffer, " Client %s : %s\n", |
1250 | ti->owner ? ti->owner : "unknown", | |
1251 | ti->flags & (SNDRV_TIMER_IFLG_START | | |
1252 | SNDRV_TIMER_IFLG_RUNNING) | |
1253 | ? "running" : "stopped"); | |
1da177e4 | 1254 | } |
1a60d4c5 | 1255 | mutex_unlock(®ister_mutex); |
1da177e4 LT |
1256 | } |
1257 | ||
6581f4e7 | 1258 | static struct snd_info_entry *snd_timer_proc_entry; |
e28563cc TI |
1259 | |
1260 | static void __init snd_timer_proc_init(void) | |
1261 | { | |
1262 | struct snd_info_entry *entry; | |
1263 | ||
1264 | entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); | |
1265 | if (entry != NULL) { | |
e28563cc TI |
1266 | entry->c.text.read = snd_timer_proc_read; |
1267 | if (snd_info_register(entry) < 0) { | |
1268 | snd_info_free_entry(entry); | |
1269 | entry = NULL; | |
1270 | } | |
1271 | } | |
1272 | snd_timer_proc_entry = entry; | |
1273 | } | |
1274 | ||
1275 | static void __exit snd_timer_proc_done(void) | |
1276 | { | |
746d4a02 | 1277 | snd_info_free_entry(snd_timer_proc_entry); |
e28563cc | 1278 | } |
cd6a6503 | 1279 | #else /* !CONFIG_SND_PROC_FS */ |
e28563cc TI |
1280 | #define snd_timer_proc_init() |
1281 | #define snd_timer_proc_done() | |
1282 | #endif | |
1283 | ||
1da177e4 LT |
1284 | /* |
1285 | * USER SPACE interface | |
1286 | */ | |
1287 | ||
53d2f744 | 1288 | static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, |
1da177e4 LT |
1289 | unsigned long resolution, |
1290 | unsigned long ticks) | |
1291 | { | |
53d2f744 TI |
1292 | struct snd_timer_user *tu = timeri->callback_data; |
1293 | struct snd_timer_read *r; | |
1da177e4 | 1294 | int prev; |
6b172a85 | 1295 | |
1da177e4 LT |
1296 | spin_lock(&tu->qlock); |
1297 | if (tu->qused > 0) { | |
1298 | prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; | |
1299 | r = &tu->queue[prev]; | |
1300 | if (r->resolution == resolution) { | |
1301 | r->ticks += ticks; | |
1302 | goto __wake; | |
1303 | } | |
1304 | } | |
1305 | if (tu->qused >= tu->queue_size) { | |
1306 | tu->overrun++; | |
1307 | } else { | |
1308 | r = &tu->queue[tu->qtail++]; | |
1309 | tu->qtail %= tu->queue_size; | |
1310 | r->resolution = resolution; | |
1311 | r->ticks = ticks; | |
1312 | tu->qused++; | |
1313 | } | |
1314 | __wake: | |
1315 | spin_unlock(&tu->qlock); | |
1316 | kill_fasync(&tu->fasync, SIGIO, POLL_IN); | |
1317 | wake_up(&tu->qchange_sleep); | |
1318 | } | |
1319 | ||
53d2f744 TI |
1320 | static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, |
1321 | struct snd_timer_tread *tread) | |
1da177e4 LT |
1322 | { |
1323 | if (tu->qused >= tu->queue_size) { | |
1324 | tu->overrun++; | |
1325 | } else { | |
1326 | memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); | |
1327 | tu->qtail %= tu->queue_size; | |
1328 | tu->qused++; | |
1329 | } | |
1330 | } | |
1331 | ||
53d2f744 TI |
1332 | static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, |
1333 | int event, | |
1da177e4 LT |
1334 | struct timespec *tstamp, |
1335 | unsigned long resolution) | |
1336 | { | |
53d2f744 TI |
1337 | struct snd_timer_user *tu = timeri->callback_data; |
1338 | struct snd_timer_tread r1; | |
bfe70783 | 1339 | unsigned long flags; |
1da177e4 | 1340 | |
6b172a85 CL |
1341 | if (event >= SNDRV_TIMER_EVENT_START && |
1342 | event <= SNDRV_TIMER_EVENT_PAUSE) | |
1da177e4 LT |
1343 | tu->tstamp = *tstamp; |
1344 | if ((tu->filter & (1 << event)) == 0 || !tu->tread) | |
1345 | return; | |
9a47e9cf | 1346 | memset(&r1, 0, sizeof(r1)); |
1da177e4 LT |
1347 | r1.event = event; |
1348 | r1.tstamp = *tstamp; | |
1349 | r1.val = resolution; | |
bfe70783 | 1350 | spin_lock_irqsave(&tu->qlock, flags); |
1da177e4 | 1351 | snd_timer_user_append_to_tqueue(tu, &r1); |
bfe70783 | 1352 | spin_unlock_irqrestore(&tu->qlock, flags); |
1da177e4 LT |
1353 | kill_fasync(&tu->fasync, SIGIO, POLL_IN); |
1354 | wake_up(&tu->qchange_sleep); | |
1355 | } | |
1356 | ||
40ed9444 TI |
1357 | static void snd_timer_user_disconnect(struct snd_timer_instance *timeri) |
1358 | { | |
1359 | struct snd_timer_user *tu = timeri->callback_data; | |
1360 | ||
1361 | tu->disconnected = true; | |
1362 | wake_up(&tu->qchange_sleep); | |
1363 | } | |
1364 | ||
53d2f744 | 1365 | static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, |
1da177e4 LT |
1366 | unsigned long resolution, |
1367 | unsigned long ticks) | |
1368 | { | |
53d2f744 TI |
1369 | struct snd_timer_user *tu = timeri->callback_data; |
1370 | struct snd_timer_tread *r, r1; | |
1da177e4 LT |
1371 | struct timespec tstamp; |
1372 | int prev, append = 0; | |
1373 | ||
a8c006aa | 1374 | memset(&r1, 0, sizeof(r1)); |
07799e75 | 1375 | memset(&tstamp, 0, sizeof(tstamp)); |
1da177e4 | 1376 | spin_lock(&tu->qlock); |
6b172a85 CL |
1377 | if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | |
1378 | (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { | |
1da177e4 LT |
1379 | spin_unlock(&tu->qlock); |
1380 | return; | |
1381 | } | |
b751eef1 JK |
1382 | if (tu->last_resolution != resolution || ticks > 0) { |
1383 | if (timer_tstamp_monotonic) | |
26204e04 | 1384 | ktime_get_ts(&tstamp); |
b751eef1 JK |
1385 | else |
1386 | getnstimeofday(&tstamp); | |
1387 | } | |
6b172a85 CL |
1388 | if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && |
1389 | tu->last_resolution != resolution) { | |
1da177e4 LT |
1390 | r1.event = SNDRV_TIMER_EVENT_RESOLUTION; |
1391 | r1.tstamp = tstamp; | |
1392 | r1.val = resolution; | |
1393 | snd_timer_user_append_to_tqueue(tu, &r1); | |
1394 | tu->last_resolution = resolution; | |
1395 | append++; | |
1396 | } | |
1397 | if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) | |
1398 | goto __wake; | |
1399 | if (ticks == 0) | |
1400 | goto __wake; | |
1401 | if (tu->qused > 0) { | |
1402 | prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; | |
1403 | r = &tu->tqueue[prev]; | |
1404 | if (r->event == SNDRV_TIMER_EVENT_TICK) { | |
1405 | r->tstamp = tstamp; | |
1406 | r->val += ticks; | |
1407 | append++; | |
1408 | goto __wake; | |
1409 | } | |
1410 | } | |
1411 | r1.event = SNDRV_TIMER_EVENT_TICK; | |
1412 | r1.tstamp = tstamp; | |
1413 | r1.val = ticks; | |
1414 | snd_timer_user_append_to_tqueue(tu, &r1); | |
1415 | append++; | |
1416 | __wake: | |
1417 | spin_unlock(&tu->qlock); | |
1418 | if (append == 0) | |
1419 | return; | |
1420 | kill_fasync(&tu->fasync, SIGIO, POLL_IN); | |
1421 | wake_up(&tu->qchange_sleep); | |
1422 | } | |
1423 | ||
890e2cb5 TI |
1424 | static int realloc_user_queue(struct snd_timer_user *tu, int size) |
1425 | { | |
1426 | struct snd_timer_read *queue = NULL; | |
1427 | struct snd_timer_tread *tqueue = NULL; | |
1428 | ||
1429 | if (tu->tread) { | |
1430 | tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL); | |
1431 | if (!tqueue) | |
1432 | return -ENOMEM; | |
1433 | } else { | |
1434 | queue = kcalloc(size, sizeof(*queue), GFP_KERNEL); | |
1435 | if (!queue) | |
1436 | return -ENOMEM; | |
1437 | } | |
1438 | ||
1439 | spin_lock_irq(&tu->qlock); | |
1440 | kfree(tu->queue); | |
1441 | kfree(tu->tqueue); | |
1442 | tu->queue_size = size; | |
1443 | tu->queue = queue; | |
1444 | tu->tqueue = tqueue; | |
1445 | tu->qhead = tu->qtail = tu->qused = 0; | |
1446 | spin_unlock_irq(&tu->qlock); | |
1447 | ||
1448 | return 0; | |
1449 | } | |
1450 | ||
1da177e4 LT |
1451 | static int snd_timer_user_open(struct inode *inode, struct file *file) |
1452 | { | |
53d2f744 | 1453 | struct snd_timer_user *tu; |
02f4865f TI |
1454 | int err; |
1455 | ||
c5bf68fe | 1456 | err = stream_open(inode, file); |
02f4865f TI |
1457 | if (err < 0) |
1458 | return err; | |
6b172a85 | 1459 | |
ca2c0966 | 1460 | tu = kzalloc(sizeof(*tu), GFP_KERNEL); |
1da177e4 LT |
1461 | if (tu == NULL) |
1462 | return -ENOMEM; | |
1463 | spin_lock_init(&tu->qlock); | |
1464 | init_waitqueue_head(&tu->qchange_sleep); | |
af368027 | 1465 | mutex_init(&tu->ioctl_lock); |
1da177e4 | 1466 | tu->ticks = 1; |
890e2cb5 | 1467 | if (realloc_user_queue(tu, 128) < 0) { |
1da177e4 LT |
1468 | kfree(tu); |
1469 | return -ENOMEM; | |
1470 | } | |
1471 | file->private_data = tu; | |
1472 | return 0; | |
1473 | } | |
1474 | ||
1475 | static int snd_timer_user_release(struct inode *inode, struct file *file) | |
1476 | { | |
53d2f744 | 1477 | struct snd_timer_user *tu; |
1da177e4 LT |
1478 | |
1479 | if (file->private_data) { | |
1480 | tu = file->private_data; | |
1481 | file->private_data = NULL; | |
af368027 | 1482 | mutex_lock(&tu->ioctl_lock); |
1da177e4 LT |
1483 | if (tu->timeri) |
1484 | snd_timer_close(tu->timeri); | |
af368027 | 1485 | mutex_unlock(&tu->ioctl_lock); |
1da177e4 LT |
1486 | kfree(tu->queue); |
1487 | kfree(tu->tqueue); | |
1488 | kfree(tu); | |
1489 | } | |
1490 | return 0; | |
1491 | } | |
1492 | ||
53d2f744 | 1493 | static void snd_timer_user_zero_id(struct snd_timer_id *id) |
1da177e4 LT |
1494 | { |
1495 | id->dev_class = SNDRV_TIMER_CLASS_NONE; | |
1496 | id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; | |
1497 | id->card = -1; | |
1498 | id->device = -1; | |
1499 | id->subdevice = -1; | |
1500 | } | |
1501 | ||
53d2f744 | 1502 | static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) |
1da177e4 LT |
1503 | { |
1504 | id->dev_class = timer->tmr_class; | |
1505 | id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; | |
1506 | id->card = timer->card ? timer->card->number : -1; | |
1507 | id->device = timer->tmr_device; | |
1508 | id->subdevice = timer->tmr_subdevice; | |
1509 | } | |
1510 | ||
53d2f744 | 1511 | static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) |
1da177e4 | 1512 | { |
53d2f744 TI |
1513 | struct snd_timer_id id; |
1514 | struct snd_timer *timer; | |
1da177e4 | 1515 | struct list_head *p; |
6b172a85 | 1516 | |
1da177e4 LT |
1517 | if (copy_from_user(&id, _tid, sizeof(id))) |
1518 | return -EFAULT; | |
1a60d4c5 | 1519 | mutex_lock(®ister_mutex); |
1da177e4 LT |
1520 | if (id.dev_class < 0) { /* first item */ |
1521 | if (list_empty(&snd_timer_list)) | |
1522 | snd_timer_user_zero_id(&id); | |
1523 | else { | |
9dfba380 | 1524 | timer = list_entry(snd_timer_list.next, |
53d2f744 | 1525 | struct snd_timer, device_list); |
1da177e4 LT |
1526 | snd_timer_user_copy_id(&id, timer); |
1527 | } | |
1528 | } else { | |
1529 | switch (id.dev_class) { | |
1530 | case SNDRV_TIMER_CLASS_GLOBAL: | |
1531 | id.device = id.device < 0 ? 0 : id.device + 1; | |
1532 | list_for_each(p, &snd_timer_list) { | |
53d2f744 | 1533 | timer = list_entry(p, struct snd_timer, device_list); |
1da177e4 LT |
1534 | if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { |
1535 | snd_timer_user_copy_id(&id, timer); | |
1536 | break; | |
1537 | } | |
1538 | if (timer->tmr_device >= id.device) { | |
1539 | snd_timer_user_copy_id(&id, timer); | |
1540 | break; | |
1541 | } | |
1542 | } | |
1543 | if (p == &snd_timer_list) | |
1544 | snd_timer_user_zero_id(&id); | |
1545 | break; | |
1546 | case SNDRV_TIMER_CLASS_CARD: | |
1547 | case SNDRV_TIMER_CLASS_PCM: | |
1548 | if (id.card < 0) { | |
1549 | id.card = 0; | |
1550 | } else { | |
e8ed6820 DC |
1551 | if (id.device < 0) { |
1552 | id.device = 0; | |
1da177e4 | 1553 | } else { |
e8ed6820 DC |
1554 | if (id.subdevice < 0) |
1555 | id.subdevice = 0; | |
b41f794f | 1556 | else if (id.subdevice < INT_MAX) |
e8ed6820 | 1557 | id.subdevice++; |
1da177e4 LT |
1558 | } |
1559 | } | |
1560 | list_for_each(p, &snd_timer_list) { | |
53d2f744 | 1561 | timer = list_entry(p, struct snd_timer, device_list); |
1da177e4 LT |
1562 | if (timer->tmr_class > id.dev_class) { |
1563 | snd_timer_user_copy_id(&id, timer); | |
1564 | break; | |
1565 | } | |
1566 | if (timer->tmr_class < id.dev_class) | |
1567 | continue; | |
1568 | if (timer->card->number > id.card) { | |
1569 | snd_timer_user_copy_id(&id, timer); | |
1570 | break; | |
1571 | } | |
1572 | if (timer->card->number < id.card) | |
1573 | continue; | |
1574 | if (timer->tmr_device > id.device) { | |
1575 | snd_timer_user_copy_id(&id, timer); | |
1576 | break; | |
1577 | } | |
1578 | if (timer->tmr_device < id.device) | |
1579 | continue; | |
1580 | if (timer->tmr_subdevice > id.subdevice) { | |
1581 | snd_timer_user_copy_id(&id, timer); | |
1582 | break; | |
1583 | } | |
1584 | if (timer->tmr_subdevice < id.subdevice) | |
1585 | continue; | |
1586 | snd_timer_user_copy_id(&id, timer); | |
1587 | break; | |
1588 | } | |
1589 | if (p == &snd_timer_list) | |
1590 | snd_timer_user_zero_id(&id); | |
1591 | break; | |
1592 | default: | |
1593 | snd_timer_user_zero_id(&id); | |
1594 | } | |
1595 | } | |
1a60d4c5 | 1596 | mutex_unlock(®ister_mutex); |
1da177e4 LT |
1597 | if (copy_to_user(_tid, &id, sizeof(*_tid))) |
1598 | return -EFAULT; | |
1599 | return 0; | |
6b172a85 | 1600 | } |
1da177e4 | 1601 | |
6b172a85 | 1602 | static int snd_timer_user_ginfo(struct file *file, |
53d2f744 | 1603 | struct snd_timer_ginfo __user *_ginfo) |
1da177e4 | 1604 | { |
53d2f744 TI |
1605 | struct snd_timer_ginfo *ginfo; |
1606 | struct snd_timer_id tid; | |
1607 | struct snd_timer *t; | |
1da177e4 LT |
1608 | struct list_head *p; |
1609 | int err = 0; | |
1610 | ||
ef44a1ec LZ |
1611 | ginfo = memdup_user(_ginfo, sizeof(*ginfo)); |
1612 | if (IS_ERR(ginfo)) | |
1613 | return PTR_ERR(ginfo); | |
1614 | ||
1da177e4 LT |
1615 | tid = ginfo->tid; |
1616 | memset(ginfo, 0, sizeof(*ginfo)); | |
1617 | ginfo->tid = tid; | |
1a60d4c5 | 1618 | mutex_lock(®ister_mutex); |
1da177e4 LT |
1619 | t = snd_timer_find(&tid); |
1620 | if (t != NULL) { | |
1621 | ginfo->card = t->card ? t->card->number : -1; | |
1622 | if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) | |
1623 | ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; | |
1624 | strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); | |
1625 | strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); | |
1626 | ginfo->resolution = t->hw.resolution; | |
1627 | if (t->hw.resolution_min > 0) { | |
1628 | ginfo->resolution_min = t->hw.resolution_min; | |
1629 | ginfo->resolution_max = t->hw.resolution_max; | |
1630 | } | |
1631 | list_for_each(p, &t->open_list_head) { | |
1632 | ginfo->clients++; | |
1633 | } | |
1634 | } else { | |
1635 | err = -ENODEV; | |
1636 | } | |
1a60d4c5 | 1637 | mutex_unlock(®ister_mutex); |
1da177e4 LT |
1638 | if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) |
1639 | err = -EFAULT; | |
1640 | kfree(ginfo); | |
1641 | return err; | |
1642 | } | |
1643 | ||
91d2178e | 1644 | static int timer_set_gparams(struct snd_timer_gparams *gparams) |
1da177e4 | 1645 | { |
53d2f744 | 1646 | struct snd_timer *t; |
1da177e4 LT |
1647 | int err; |
1648 | ||
1a60d4c5 | 1649 | mutex_lock(®ister_mutex); |
91d2178e | 1650 | t = snd_timer_find(&gparams->tid); |
6b172a85 | 1651 | if (!t) { |
1da177e4 | 1652 | err = -ENODEV; |
6b172a85 CL |
1653 | goto _error; |
1654 | } | |
1655 | if (!list_empty(&t->open_list_head)) { | |
1656 | err = -EBUSY; | |
1657 | goto _error; | |
1658 | } | |
1659 | if (!t->hw.set_period) { | |
1660 | err = -ENOSYS; | |
1661 | goto _error; | |
1da177e4 | 1662 | } |
91d2178e | 1663 | err = t->hw.set_period(t, gparams->period_num, gparams->period_den); |
6b172a85 | 1664 | _error: |
1a60d4c5 | 1665 | mutex_unlock(®ister_mutex); |
1da177e4 LT |
1666 | return err; |
1667 | } | |
1668 | ||
91d2178e TS |
1669 | static int snd_timer_user_gparams(struct file *file, |
1670 | struct snd_timer_gparams __user *_gparams) | |
1671 | { | |
1672 | struct snd_timer_gparams gparams; | |
1673 | ||
1674 | if (copy_from_user(&gparams, _gparams, sizeof(gparams))) | |
1675 | return -EFAULT; | |
1676 | return timer_set_gparams(&gparams); | |
1677 | } | |
1678 | ||
6b172a85 | 1679 | static int snd_timer_user_gstatus(struct file *file, |
53d2f744 | 1680 | struct snd_timer_gstatus __user *_gstatus) |
1da177e4 | 1681 | { |
53d2f744 TI |
1682 | struct snd_timer_gstatus gstatus; |
1683 | struct snd_timer_id tid; | |
1684 | struct snd_timer *t; | |
1da177e4 LT |
1685 | int err = 0; |
1686 | ||
1687 | if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) | |
1688 | return -EFAULT; | |
1689 | tid = gstatus.tid; | |
1690 | memset(&gstatus, 0, sizeof(gstatus)); | |
1691 | gstatus.tid = tid; | |
1a60d4c5 | 1692 | mutex_lock(®ister_mutex); |
1da177e4 LT |
1693 | t = snd_timer_find(&tid); |
1694 | if (t != NULL) { | |
9d4d207d | 1695 | spin_lock_irq(&t->lock); |
fdcb5761 | 1696 | gstatus.resolution = snd_timer_hw_resolution(t); |
1da177e4 | 1697 | if (t->hw.precise_resolution) { |
6b172a85 CL |
1698 | t->hw.precise_resolution(t, &gstatus.resolution_num, |
1699 | &gstatus.resolution_den); | |
1da177e4 LT |
1700 | } else { |
1701 | gstatus.resolution_num = gstatus.resolution; | |
1702 | gstatus.resolution_den = 1000000000uL; | |
1703 | } | |
9d4d207d | 1704 | spin_unlock_irq(&t->lock); |
1da177e4 LT |
1705 | } else { |
1706 | err = -ENODEV; | |
1707 | } | |
1a60d4c5 | 1708 | mutex_unlock(®ister_mutex); |
1da177e4 LT |
1709 | if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) |
1710 | err = -EFAULT; | |
1711 | return err; | |
1712 | } | |
1713 | ||
6b172a85 | 1714 | static int snd_timer_user_tselect(struct file *file, |
53d2f744 | 1715 | struct snd_timer_select __user *_tselect) |
1da177e4 | 1716 | { |
53d2f744 TI |
1717 | struct snd_timer_user *tu; |
1718 | struct snd_timer_select tselect; | |
1da177e4 | 1719 | char str[32]; |
c1935b4d | 1720 | int err = 0; |
6b172a85 | 1721 | |
1da177e4 | 1722 | tu = file->private_data; |
c1935b4d | 1723 | if (tu->timeri) { |
1da177e4 | 1724 | snd_timer_close(tu->timeri); |
c1935b4d JK |
1725 | tu->timeri = NULL; |
1726 | } | |
1727 | if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { | |
1728 | err = -EFAULT; | |
1729 | goto __err; | |
1730 | } | |
1da177e4 LT |
1731 | sprintf(str, "application %i", current->pid); |
1732 | if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) | |
1733 | tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; | |
6b172a85 CL |
1734 | err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); |
1735 | if (err < 0) | |
c1935b4d | 1736 | goto __err; |
1da177e4 | 1737 | |
890e2cb5 TI |
1738 | tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; |
1739 | tu->timeri->callback = tu->tread | |
6b172a85 | 1740 | ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; |
890e2cb5 TI |
1741 | tu->timeri->ccallback = snd_timer_user_ccallback; |
1742 | tu->timeri->callback_data = (void *)tu; | |
1743 | tu->timeri->disconnect = snd_timer_user_disconnect; | |
c1935b4d JK |
1744 | |
1745 | __err: | |
c1935b4d | 1746 | return err; |
1da177e4 LT |
1747 | } |
1748 | ||
6b172a85 | 1749 | static int snd_timer_user_info(struct file *file, |
53d2f744 | 1750 | struct snd_timer_info __user *_info) |
1da177e4 | 1751 | { |
53d2f744 TI |
1752 | struct snd_timer_user *tu; |
1753 | struct snd_timer_info *info; | |
1754 | struct snd_timer *t; | |
1da177e4 LT |
1755 | int err = 0; |
1756 | ||
1757 | tu = file->private_data; | |
7c64ec34 CL |
1758 | if (!tu->timeri) |
1759 | return -EBADFD; | |
1da177e4 | 1760 | t = tu->timeri->timer; |
7c64ec34 CL |
1761 | if (!t) |
1762 | return -EBADFD; | |
1da177e4 | 1763 | |
ca2c0966 | 1764 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
1765 | if (! info) |
1766 | return -ENOMEM; | |
1767 | info->card = t->card ? t->card->number : -1; | |
1768 | if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) | |
1769 | info->flags |= SNDRV_TIMER_FLG_SLAVE; | |
1770 | strlcpy(info->id, t->id, sizeof(info->id)); | |
1771 | strlcpy(info->name, t->name, sizeof(info->name)); | |
1772 | info->resolution = t->hw.resolution; | |
1773 | if (copy_to_user(_info, info, sizeof(*_info))) | |
1774 | err = -EFAULT; | |
1775 | kfree(info); | |
1776 | return err; | |
1777 | } | |
1778 | ||
6b172a85 | 1779 | static int snd_timer_user_params(struct file *file, |
53d2f744 | 1780 | struct snd_timer_params __user *_params) |
1da177e4 | 1781 | { |
53d2f744 TI |
1782 | struct snd_timer_user *tu; |
1783 | struct snd_timer_params params; | |
1784 | struct snd_timer *t; | |
1da177e4 | 1785 | int err; |
6b172a85 | 1786 | |
1da177e4 | 1787 | tu = file->private_data; |
7c64ec34 CL |
1788 | if (!tu->timeri) |
1789 | return -EBADFD; | |
1da177e4 | 1790 | t = tu->timeri->timer; |
7c64ec34 CL |
1791 | if (!t) |
1792 | return -EBADFD; | |
1da177e4 LT |
1793 | if (copy_from_user(¶ms, _params, sizeof(params))) |
1794 | return -EFAULT; | |
71321eb3 TI |
1795 | if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) { |
1796 | u64 resolution; | |
1797 | ||
1798 | if (params.ticks < 1) { | |
1799 | err = -EINVAL; | |
1800 | goto _end; | |
1801 | } | |
1802 | ||
1803 | /* Don't allow resolution less than 1ms */ | |
1804 | resolution = snd_timer_resolution(tu->timeri); | |
1805 | resolution *= params.ticks; | |
1806 | if (resolution < 1000000) { | |
1807 | err = -EINVAL; | |
1808 | goto _end; | |
1809 | } | |
1da177e4 | 1810 | } |
6b172a85 CL |
1811 | if (params.queue_size > 0 && |
1812 | (params.queue_size < 32 || params.queue_size > 1024)) { | |
1da177e4 LT |
1813 | err = -EINVAL; |
1814 | goto _end; | |
1815 | } | |
1816 | if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| | |
1817 | (1<<SNDRV_TIMER_EVENT_TICK)| | |
1818 | (1<<SNDRV_TIMER_EVENT_START)| | |
1819 | (1<<SNDRV_TIMER_EVENT_STOP)| | |
1820 | (1<<SNDRV_TIMER_EVENT_CONTINUE)| | |
1821 | (1<<SNDRV_TIMER_EVENT_PAUSE)| | |
a501dfa3 JK |
1822 | (1<<SNDRV_TIMER_EVENT_SUSPEND)| |
1823 | (1<<SNDRV_TIMER_EVENT_RESUME)| | |
1da177e4 LT |
1824 | (1<<SNDRV_TIMER_EVENT_MSTART)| |
1825 | (1<<SNDRV_TIMER_EVENT_MSTOP)| | |
1826 | (1<<SNDRV_TIMER_EVENT_MCONTINUE)| | |
65d11d95 JK |
1827 | (1<<SNDRV_TIMER_EVENT_MPAUSE)| |
1828 | (1<<SNDRV_TIMER_EVENT_MSUSPEND)| | |
a501dfa3 | 1829 | (1<<SNDRV_TIMER_EVENT_MRESUME))) { |
1da177e4 LT |
1830 | err = -EINVAL; |
1831 | goto _end; | |
1832 | } | |
1833 | snd_timer_stop(tu->timeri); | |
1834 | spin_lock_irq(&t->lock); | |
1835 | tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| | |
1836 | SNDRV_TIMER_IFLG_EXCLUSIVE| | |
1837 | SNDRV_TIMER_IFLG_EARLY_EVENT); | |
1838 | if (params.flags & SNDRV_TIMER_PSFLG_AUTO) | |
1839 | tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; | |
1840 | if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) | |
1841 | tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; | |
1842 | if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) | |
1843 | tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; | |
1844 | spin_unlock_irq(&t->lock); | |
6b172a85 CL |
1845 | if (params.queue_size > 0 && |
1846 | (unsigned int)tu->queue_size != params.queue_size) { | |
890e2cb5 TI |
1847 | err = realloc_user_queue(tu, params.queue_size); |
1848 | if (err < 0) | |
1849 | goto _end; | |
1da177e4 | 1850 | } |
d7f910bf | 1851 | spin_lock_irq(&tu->qlock); |
1da177e4 LT |
1852 | tu->qhead = tu->qtail = tu->qused = 0; |
1853 | if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { | |
1854 | if (tu->tread) { | |
53d2f744 | 1855 | struct snd_timer_tread tread; |
cec8f96e | 1856 | memset(&tread, 0, sizeof(tread)); |
1da177e4 LT |
1857 | tread.event = SNDRV_TIMER_EVENT_EARLY; |
1858 | tread.tstamp.tv_sec = 0; | |
1859 | tread.tstamp.tv_nsec = 0; | |
1860 | tread.val = 0; | |
1861 | snd_timer_user_append_to_tqueue(tu, &tread); | |
1862 | } else { | |
53d2f744 | 1863 | struct snd_timer_read *r = &tu->queue[0]; |
1da177e4 LT |
1864 | r->resolution = 0; |
1865 | r->ticks = 0; | |
1866 | tu->qused++; | |
1867 | tu->qtail++; | |
1868 | } | |
1da177e4 LT |
1869 | } |
1870 | tu->filter = params.filter; | |
1871 | tu->ticks = params.ticks; | |
d7f910bf | 1872 | spin_unlock_irq(&tu->qlock); |
1da177e4 LT |
1873 | err = 0; |
1874 | _end: | |
1875 | if (copy_to_user(_params, ¶ms, sizeof(params))) | |
1876 | return -EFAULT; | |
1877 | return err; | |
1878 | } | |
1879 | ||
6b172a85 | 1880 | static int snd_timer_user_status(struct file *file, |
53d2f744 | 1881 | struct snd_timer_status __user *_status) |
1da177e4 | 1882 | { |
53d2f744 TI |
1883 | struct snd_timer_user *tu; |
1884 | struct snd_timer_status status; | |
6b172a85 | 1885 | |
1da177e4 | 1886 | tu = file->private_data; |
7c64ec34 CL |
1887 | if (!tu->timeri) |
1888 | return -EBADFD; | |
1da177e4 LT |
1889 | memset(&status, 0, sizeof(status)); |
1890 | status.tstamp = tu->tstamp; | |
1891 | status.resolution = snd_timer_resolution(tu->timeri); | |
1892 | status.lost = tu->timeri->lost; | |
1893 | status.overrun = tu->overrun; | |
1894 | spin_lock_irq(&tu->qlock); | |
1895 | status.queue = tu->qused; | |
1896 | spin_unlock_irq(&tu->qlock); | |
1897 | if (copy_to_user(_status, &status, sizeof(status))) | |
1898 | return -EFAULT; | |
1899 | return 0; | |
1900 | } | |
1901 | ||
1902 | static int snd_timer_user_start(struct file *file) | |
1903 | { | |
1904 | int err; | |
53d2f744 | 1905 | struct snd_timer_user *tu; |
6b172a85 | 1906 | |
1da177e4 | 1907 | tu = file->private_data; |
7c64ec34 CL |
1908 | if (!tu->timeri) |
1909 | return -EBADFD; | |
1da177e4 LT |
1910 | snd_timer_stop(tu->timeri); |
1911 | tu->timeri->lost = 0; | |
1912 | tu->last_resolution = 0; | |
5d704b0d TI |
1913 | err = snd_timer_start(tu->timeri, tu->ticks); |
1914 | if (err < 0) | |
1915 | return err; | |
1916 | return 0; | |
1da177e4 LT |
1917 | } |
1918 | ||
1919 | static int snd_timer_user_stop(struct file *file) | |
1920 | { | |
1921 | int err; | |
53d2f744 | 1922 | struct snd_timer_user *tu; |
6b172a85 | 1923 | |
1da177e4 | 1924 | tu = file->private_data; |
7c64ec34 CL |
1925 | if (!tu->timeri) |
1926 | return -EBADFD; | |
5d704b0d TI |
1927 | err = snd_timer_stop(tu->timeri); |
1928 | if (err < 0) | |
1929 | return err; | |
1930 | return 0; | |
1da177e4 LT |
1931 | } |
1932 | ||
1933 | static int snd_timer_user_continue(struct file *file) | |
1934 | { | |
1935 | int err; | |
53d2f744 | 1936 | struct snd_timer_user *tu; |
6b172a85 | 1937 | |
1da177e4 | 1938 | tu = file->private_data; |
7c64ec34 CL |
1939 | if (!tu->timeri) |
1940 | return -EBADFD; | |
9f8a7658 TI |
1941 | /* start timer instead of continue if it's not used before */ |
1942 | if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED)) | |
1943 | return snd_timer_user_start(file); | |
1da177e4 | 1944 | tu->timeri->lost = 0; |
5d704b0d TI |
1945 | err = snd_timer_continue(tu->timeri); |
1946 | if (err < 0) | |
1947 | return err; | |
1948 | return 0; | |
1da177e4 LT |
1949 | } |
1950 | ||
15790a6b TI |
1951 | static int snd_timer_user_pause(struct file *file) |
1952 | { | |
1953 | int err; | |
53d2f744 | 1954 | struct snd_timer_user *tu; |
6b172a85 | 1955 | |
15790a6b | 1956 | tu = file->private_data; |
7c64ec34 CL |
1957 | if (!tu->timeri) |
1958 | return -EBADFD; | |
5d704b0d TI |
1959 | err = snd_timer_pause(tu->timeri); |
1960 | if (err < 0) | |
1961 | return err; | |
1962 | return 0; | |
15790a6b TI |
1963 | } |
1964 | ||
8c50b37c TI |
1965 | enum { |
1966 | SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), | |
1967 | SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), | |
1968 | SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), | |
1969 | SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), | |
1970 | }; | |
1971 | ||
af368027 | 1972 | static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, |
6b172a85 | 1973 | unsigned long arg) |
1da177e4 | 1974 | { |
53d2f744 | 1975 | struct snd_timer_user *tu; |
1da177e4 LT |
1976 | void __user *argp = (void __user *)arg; |
1977 | int __user *p = argp; | |
6b172a85 | 1978 | |
1da177e4 LT |
1979 | tu = file->private_data; |
1980 | switch (cmd) { | |
1981 | case SNDRV_TIMER_IOCTL_PVERSION: | |
1982 | return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; | |
1983 | case SNDRV_TIMER_IOCTL_NEXT_DEVICE: | |
1984 | return snd_timer_user_next_device(argp); | |
1985 | case SNDRV_TIMER_IOCTL_TREAD: | |
1986 | { | |
890e2cb5 | 1987 | int xarg, old_tread; |
6b172a85 | 1988 | |
af368027 | 1989 | if (tu->timeri) /* too late */ |
1da177e4 | 1990 | return -EBUSY; |
af368027 | 1991 | if (get_user(xarg, p)) |
1da177e4 | 1992 | return -EFAULT; |
890e2cb5 | 1993 | old_tread = tu->tread; |
1da177e4 | 1994 | tu->tread = xarg ? 1 : 0; |
890e2cb5 TI |
1995 | if (tu->tread != old_tread && |
1996 | realloc_user_queue(tu, tu->queue_size) < 0) { | |
1997 | tu->tread = old_tread; | |
1998 | return -ENOMEM; | |
1999 | } | |
1da177e4 LT |
2000 | return 0; |
2001 | } | |
2002 | case SNDRV_TIMER_IOCTL_GINFO: | |
2003 | return snd_timer_user_ginfo(file, argp); | |
2004 | case SNDRV_TIMER_IOCTL_GPARAMS: | |
2005 | return snd_timer_user_gparams(file, argp); | |
2006 | case SNDRV_TIMER_IOCTL_GSTATUS: | |
2007 | return snd_timer_user_gstatus(file, argp); | |
2008 | case SNDRV_TIMER_IOCTL_SELECT: | |
2009 | return snd_timer_user_tselect(file, argp); | |
2010 | case SNDRV_TIMER_IOCTL_INFO: | |
2011 | return snd_timer_user_info(file, argp); | |
2012 | case SNDRV_TIMER_IOCTL_PARAMS: | |
2013 | return snd_timer_user_params(file, argp); | |
2014 | case SNDRV_TIMER_IOCTL_STATUS: | |
2015 | return snd_timer_user_status(file, argp); | |
2016 | case SNDRV_TIMER_IOCTL_START: | |
8c50b37c | 2017 | case SNDRV_TIMER_IOCTL_START_OLD: |
1da177e4 LT |
2018 | return snd_timer_user_start(file); |
2019 | case SNDRV_TIMER_IOCTL_STOP: | |
8c50b37c | 2020 | case SNDRV_TIMER_IOCTL_STOP_OLD: |
1da177e4 LT |
2021 | return snd_timer_user_stop(file); |
2022 | case SNDRV_TIMER_IOCTL_CONTINUE: | |
8c50b37c | 2023 | case SNDRV_TIMER_IOCTL_CONTINUE_OLD: |
1da177e4 | 2024 | return snd_timer_user_continue(file); |
15790a6b | 2025 | case SNDRV_TIMER_IOCTL_PAUSE: |
8c50b37c | 2026 | case SNDRV_TIMER_IOCTL_PAUSE_OLD: |
15790a6b | 2027 | return snd_timer_user_pause(file); |
1da177e4 LT |
2028 | } |
2029 | return -ENOTTY; | |
2030 | } | |
2031 | ||
af368027 TI |
2032 | static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, |
2033 | unsigned long arg) | |
2034 | { | |
2035 | struct snd_timer_user *tu = file->private_data; | |
2036 | long ret; | |
2037 | ||
2038 | mutex_lock(&tu->ioctl_lock); | |
2039 | ret = __snd_timer_user_ioctl(file, cmd, arg); | |
2040 | mutex_unlock(&tu->ioctl_lock); | |
2041 | return ret; | |
2042 | } | |
2043 | ||
1da177e4 LT |
2044 | static int snd_timer_user_fasync(int fd, struct file * file, int on) |
2045 | { | |
53d2f744 | 2046 | struct snd_timer_user *tu; |
6b172a85 | 2047 | |
1da177e4 | 2048 | tu = file->private_data; |
60aa4924 | 2049 | return fasync_helper(fd, file, on, &tu->fasync); |
1da177e4 LT |
2050 | } |
2051 | ||
6b172a85 CL |
2052 | static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, |
2053 | size_t count, loff_t *offset) | |
1da177e4 | 2054 | { |
53d2f744 | 2055 | struct snd_timer_user *tu; |
1da177e4 | 2056 | long result = 0, unit; |
4dff5c7b | 2057 | int qhead; |
1da177e4 | 2058 | int err = 0; |
6b172a85 | 2059 | |
1da177e4 | 2060 | tu = file->private_data; |
53d2f744 | 2061 | unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); |
d11662f4 | 2062 | mutex_lock(&tu->ioctl_lock); |
1da177e4 LT |
2063 | spin_lock_irq(&tu->qlock); |
2064 | while ((long)count - result >= unit) { | |
2065 | while (!tu->qused) { | |
ac6424b9 | 2066 | wait_queue_entry_t wait; |
1da177e4 LT |
2067 | |
2068 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
2069 | err = -EAGAIN; | |
4dff5c7b | 2070 | goto _error; |
1da177e4 LT |
2071 | } |
2072 | ||
2073 | set_current_state(TASK_INTERRUPTIBLE); | |
2074 | init_waitqueue_entry(&wait, current); | |
2075 | add_wait_queue(&tu->qchange_sleep, &wait); | |
2076 | ||
2077 | spin_unlock_irq(&tu->qlock); | |
d11662f4 | 2078 | mutex_unlock(&tu->ioctl_lock); |
1da177e4 | 2079 | schedule(); |
d11662f4 | 2080 | mutex_lock(&tu->ioctl_lock); |
1da177e4 LT |
2081 | spin_lock_irq(&tu->qlock); |
2082 | ||
2083 | remove_wait_queue(&tu->qchange_sleep, &wait); | |
2084 | ||
230323da TI |
2085 | if (tu->disconnected) { |
2086 | err = -ENODEV; | |
4dff5c7b | 2087 | goto _error; |
230323da | 2088 | } |
1da177e4 LT |
2089 | if (signal_pending(current)) { |
2090 | err = -ERESTARTSYS; | |
4dff5c7b | 2091 | goto _error; |
1da177e4 LT |
2092 | } |
2093 | } | |
2094 | ||
4dff5c7b TI |
2095 | qhead = tu->qhead++; |
2096 | tu->qhead %= tu->queue_size; | |
3fa6993f | 2097 | tu->qused--; |
1da177e4 | 2098 | spin_unlock_irq(&tu->qlock); |
1da177e4 LT |
2099 | |
2100 | if (tu->tread) { | |
4dff5c7b TI |
2101 | if (copy_to_user(buffer, &tu->tqueue[qhead], |
2102 | sizeof(struct snd_timer_tread))) | |
1da177e4 | 2103 | err = -EFAULT; |
1da177e4 | 2104 | } else { |
4dff5c7b TI |
2105 | if (copy_to_user(buffer, &tu->queue[qhead], |
2106 | sizeof(struct snd_timer_read))) | |
1da177e4 | 2107 | err = -EFAULT; |
1da177e4 LT |
2108 | } |
2109 | ||
1da177e4 | 2110 | spin_lock_irq(&tu->qlock); |
4dff5c7b TI |
2111 | if (err < 0) |
2112 | goto _error; | |
2113 | result += unit; | |
2114 | buffer += unit; | |
1da177e4 | 2115 | } |
1da177e4 | 2116 | _error: |
4dff5c7b | 2117 | spin_unlock_irq(&tu->qlock); |
d11662f4 | 2118 | mutex_unlock(&tu->ioctl_lock); |
1da177e4 LT |
2119 | return result > 0 ? result : err; |
2120 | } | |
2121 | ||
680ef72a | 2122 | static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait) |
1da177e4 | 2123 | { |
680ef72a | 2124 | __poll_t mask; |
53d2f744 | 2125 | struct snd_timer_user *tu; |
1da177e4 LT |
2126 | |
2127 | tu = file->private_data; | |
2128 | ||
2129 | poll_wait(file, &tu->qchange_sleep, wait); | |
6b172a85 | 2130 | |
1da177e4 | 2131 | mask = 0; |
d7f910bf | 2132 | spin_lock_irq(&tu->qlock); |
1da177e4 | 2133 | if (tu->qused) |
a9a08845 | 2134 | mask |= EPOLLIN | EPOLLRDNORM; |
230323da | 2135 | if (tu->disconnected) |
a9a08845 | 2136 | mask |= EPOLLERR; |
d7f910bf | 2137 | spin_unlock_irq(&tu->qlock); |
1da177e4 LT |
2138 | |
2139 | return mask; | |
2140 | } | |
2141 | ||
2142 | #ifdef CONFIG_COMPAT | |
2143 | #include "timer_compat.c" | |
2144 | #else | |
2145 | #define snd_timer_user_ioctl_compat NULL | |
2146 | #endif | |
2147 | ||
9c2e08c5 | 2148 | static const struct file_operations snd_timer_f_ops = |
1da177e4 LT |
2149 | { |
2150 | .owner = THIS_MODULE, | |
2151 | .read = snd_timer_user_read, | |
2152 | .open = snd_timer_user_open, | |
2153 | .release = snd_timer_user_release, | |
02f4865f | 2154 | .llseek = no_llseek, |
1da177e4 LT |
2155 | .poll = snd_timer_user_poll, |
2156 | .unlocked_ioctl = snd_timer_user_ioctl, | |
2157 | .compat_ioctl = snd_timer_user_ioctl_compat, | |
2158 | .fasync = snd_timer_user_fasync, | |
2159 | }; | |
2160 | ||
7c35860d TI |
2161 | /* unregister the system timer */ |
2162 | static void snd_timer_free_all(void) | |
2163 | { | |
2164 | struct snd_timer *timer, *n; | |
2165 | ||
2166 | list_for_each_entry_safe(timer, n, &snd_timer_list, device_list) | |
2167 | snd_timer_free(timer); | |
2168 | } | |
2169 | ||
89da061f TI |
2170 | static struct device timer_dev; |
2171 | ||
1da177e4 LT |
2172 | /* |
2173 | * ENTRY functions | |
2174 | */ | |
2175 | ||
1da177e4 LT |
2176 | static int __init alsa_timer_init(void) |
2177 | { | |
2178 | int err; | |
1da177e4 | 2179 | |
89da061f TI |
2180 | snd_device_initialize(&timer_dev, NULL); |
2181 | dev_set_name(&timer_dev, "timer"); | |
2182 | ||
1da177e4 | 2183 | #ifdef SNDRV_OSS_INFO_DEV_TIMERS |
6b172a85 CL |
2184 | snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, |
2185 | "system timer"); | |
1da177e4 | 2186 | #endif |
e28563cc | 2187 | |
7c35860d TI |
2188 | err = snd_timer_register_system(); |
2189 | if (err < 0) { | |
cf74dcf3 | 2190 | pr_err("ALSA: unable to register system timer (%i)\n", err); |
1ae0e4ce | 2191 | goto put_timer; |
7c35860d TI |
2192 | } |
2193 | ||
40a4b263 TI |
2194 | err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, |
2195 | &snd_timer_f_ops, NULL, &timer_dev); | |
7c35860d | 2196 | if (err < 0) { |
cf74dcf3 | 2197 | pr_err("ALSA: unable to register timer device (%i)\n", err); |
7c35860d | 2198 | snd_timer_free_all(); |
1ae0e4ce | 2199 | goto put_timer; |
7c35860d TI |
2200 | } |
2201 | ||
e28563cc | 2202 | snd_timer_proc_init(); |
1da177e4 | 2203 | return 0; |
1ae0e4ce ME |
2204 | |
2205 | put_timer: | |
2206 | put_device(&timer_dev); | |
2207 | return err; | |
1da177e4 LT |
2208 | } |
2209 | ||
2210 | static void __exit alsa_timer_exit(void) | |
2211 | { | |
40a4b263 | 2212 | snd_unregister_device(&timer_dev); |
7c35860d | 2213 | snd_timer_free_all(); |
89da061f | 2214 | put_device(&timer_dev); |
e28563cc | 2215 | snd_timer_proc_done(); |
1da177e4 LT |
2216 | #ifdef SNDRV_OSS_INFO_DEV_TIMERS |
2217 | snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); | |
2218 | #endif | |
2219 | } | |
2220 | ||
2221 | module_init(alsa_timer_init) | |
2222 | module_exit(alsa_timer_exit) |