2 * Routines for driver control interface
3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
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.
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.
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
22 #include <sound/driver.h>
23 #include <linux/threads.h>
24 #include <linux/interrupt.h>
25 #include <linux/smp_lock.h>
26 #include <linux/slab.h>
27 #include <linux/vmalloc.h>
28 #include <linux/time.h>
29 #include <sound/core.h>
30 #include <sound/minors.h>
31 #include <sound/info.h>
32 #include <sound/control.h>
34 /* max number of user-defined controls */
35 #define MAX_USER_CONTROLS 32
37 struct snd_kctl_ioctl
{
38 struct list_head list
; /* list of all ioctls */
39 snd_kctl_ioctl_func_t fioctl
;
42 static DECLARE_RWSEM(snd_ioctl_rwsem
);
43 static LIST_HEAD(snd_control_ioctls
);
45 static LIST_HEAD(snd_control_compat_ioctls
);
48 static int snd_ctl_open(struct inode
*inode
, struct file
*file
)
51 struct snd_card
*card
;
52 struct snd_ctl_file
*ctl
;
55 card
= snd_lookup_minor_data(iminor(inode
), SNDRV_DEVICE_TYPE_CONTROL
);
60 err
= snd_card_file_add(card
, file
);
65 if (!try_module_get(card
->module
)) {
69 ctl
= kzalloc(sizeof(*ctl
), GFP_KERNEL
);
74 INIT_LIST_HEAD(&ctl
->events
);
75 init_waitqueue_head(&ctl
->change_sleep
);
76 spin_lock_init(&ctl
->read_lock
);
78 ctl
->pid
= current
->pid
;
79 file
->private_data
= ctl
;
80 write_lock_irqsave(&card
->ctl_files_rwlock
, flags
);
81 list_add_tail(&ctl
->list
, &card
->ctl_files
);
82 write_unlock_irqrestore(&card
->ctl_files_rwlock
, flags
);
86 module_put(card
->module
);
88 snd_card_file_remove(card
, file
);
93 static void snd_ctl_empty_read_queue(struct snd_ctl_file
* ctl
)
95 struct snd_kctl_event
*cread
;
97 spin_lock(&ctl
->read_lock
);
98 while (!list_empty(&ctl
->events
)) {
99 cread
= snd_kctl_event(ctl
->events
.next
);
100 list_del(&cread
->list
);
103 spin_unlock(&ctl
->read_lock
);
106 static int snd_ctl_release(struct inode
*inode
, struct file
*file
)
109 struct list_head
*list
;
110 struct snd_card
*card
;
111 struct snd_ctl_file
*ctl
;
112 struct snd_kcontrol
*control
;
115 ctl
= file
->private_data
;
116 fasync_helper(-1, file
, 0, &ctl
->fasync
);
117 file
->private_data
= NULL
;
119 write_lock_irqsave(&card
->ctl_files_rwlock
, flags
);
120 list_del(&ctl
->list
);
121 write_unlock_irqrestore(&card
->ctl_files_rwlock
, flags
);
122 down_write(&card
->controls_rwsem
);
123 list_for_each(list
, &card
->controls
) {
124 control
= snd_kcontrol(list
);
125 for (idx
= 0; idx
< control
->count
; idx
++)
126 if (control
->vd
[idx
].owner
== ctl
)
127 control
->vd
[idx
].owner
= NULL
;
129 up_write(&card
->controls_rwsem
);
130 snd_ctl_empty_read_queue(ctl
);
132 module_put(card
->module
);
133 snd_card_file_remove(card
, file
);
137 void snd_ctl_notify(struct snd_card
*card
, unsigned int mask
,
138 struct snd_ctl_elem_id
*id
)
141 struct list_head
*flist
;
142 struct snd_ctl_file
*ctl
;
143 struct snd_kctl_event
*ev
;
145 snd_assert(card
!= NULL
&& id
!= NULL
, return);
146 read_lock(&card
->ctl_files_rwlock
);
147 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
148 card
->mixer_oss_change_count
++;
150 list_for_each(flist
, &card
->ctl_files
) {
151 struct list_head
*elist
;
152 ctl
= snd_ctl_file(flist
);
153 if (!ctl
->subscribed
)
155 spin_lock_irqsave(&ctl
->read_lock
, flags
);
156 list_for_each(elist
, &ctl
->events
) {
157 ev
= snd_kctl_event(elist
);
158 if (ev
->id
.numid
== id
->numid
) {
163 ev
= kzalloc(sizeof(*ev
), GFP_ATOMIC
);
167 list_add_tail(&ev
->list
, &ctl
->events
);
169 snd_printk(KERN_ERR
"No memory available to allocate event\n");
172 wake_up(&ctl
->change_sleep
);
173 spin_unlock_irqrestore(&ctl
->read_lock
, flags
);
174 kill_fasync(&ctl
->fasync
, SIGIO
, POLL_IN
);
176 read_unlock(&card
->ctl_files_rwlock
);
180 * snd_ctl_new - create a control instance from the template
181 * @control: the control template
182 * @access: the default control access
184 * Allocates a new struct snd_kcontrol instance and copies the given template
185 * to the new instance. It does not copy volatile data (access).
187 * Returns the pointer of the new instance, or NULL on failure.
189 struct snd_kcontrol
*snd_ctl_new(struct snd_kcontrol
*control
, unsigned int access
)
191 struct snd_kcontrol
*kctl
;
194 snd_assert(control
!= NULL
, return NULL
);
195 snd_assert(control
->count
> 0, return NULL
);
196 kctl
= kzalloc(sizeof(*kctl
) + sizeof(struct snd_kcontrol_volatile
) * control
->count
, GFP_KERNEL
);
198 snd_printk(KERN_ERR
"Cannot allocate control instance\n");
202 for (idx
= 0; idx
< kctl
->count
; idx
++)
203 kctl
->vd
[idx
].access
= access
;
208 * snd_ctl_new1 - create a control instance from the template
209 * @ncontrol: the initialization record
210 * @private_data: the private data to set
212 * Allocates a new struct snd_kcontrol instance and initialize from the given
213 * template. When the access field of ncontrol is 0, it's assumed as
214 * READWRITE access. When the count field is 0, it's assumes as one.
216 * Returns the pointer of the newly generated instance, or NULL on failure.
218 struct snd_kcontrol
*snd_ctl_new1(const struct snd_kcontrol_new
*ncontrol
,
221 struct snd_kcontrol kctl
;
224 snd_assert(ncontrol
!= NULL
, return NULL
);
225 snd_assert(ncontrol
->info
!= NULL
, return NULL
);
226 memset(&kctl
, 0, sizeof(kctl
));
227 kctl
.id
.iface
= ncontrol
->iface
;
228 kctl
.id
.device
= ncontrol
->device
;
229 kctl
.id
.subdevice
= ncontrol
->subdevice
;
231 strlcpy(kctl
.id
.name
, ncontrol
->name
, sizeof(kctl
.id
.name
));
232 kctl
.id
.index
= ncontrol
->index
;
233 kctl
.count
= ncontrol
->count
? ncontrol
->count
: 1;
234 access
= ncontrol
->access
== 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE
:
235 (ncontrol
->access
& (SNDRV_CTL_ELEM_ACCESS_READWRITE
|SNDRV_CTL_ELEM_ACCESS_INACTIVE
|
236 SNDRV_CTL_ELEM_ACCESS_DINDIRECT
|SNDRV_CTL_ELEM_ACCESS_INDIRECT
));
237 kctl
.info
= ncontrol
->info
;
238 kctl
.get
= ncontrol
->get
;
239 kctl
.put
= ncontrol
->put
;
240 kctl
.private_value
= ncontrol
->private_value
;
241 kctl
.private_data
= private_data
;
242 return snd_ctl_new(&kctl
, access
);
246 * snd_ctl_free_one - release the control instance
247 * @kcontrol: the control instance
249 * Releases the control instance created via snd_ctl_new()
251 * Don't call this after the control was added to the card.
253 void snd_ctl_free_one(struct snd_kcontrol
*kcontrol
)
256 if (kcontrol
->private_free
)
257 kcontrol
->private_free(kcontrol
);
262 static unsigned int snd_ctl_hole_check(struct snd_card
*card
,
265 struct list_head
*list
;
266 struct snd_kcontrol
*kctl
;
268 list_for_each(list
, &card
->controls
) {
269 kctl
= snd_kcontrol(list
);
270 if ((kctl
->id
.numid
<= card
->last_numid
&&
271 kctl
->id
.numid
+ kctl
->count
> card
->last_numid
) ||
272 (kctl
->id
.numid
<= card
->last_numid
+ count
- 1 &&
273 kctl
->id
.numid
+ kctl
->count
> card
->last_numid
+ count
- 1))
274 return card
->last_numid
= kctl
->id
.numid
+ kctl
->count
- 1;
276 return card
->last_numid
;
279 static int snd_ctl_find_hole(struct snd_card
*card
, unsigned int count
)
281 unsigned int last_numid
, iter
= 100000;
283 last_numid
= card
->last_numid
;
284 while (last_numid
!= snd_ctl_hole_check(card
, count
)) {
286 /* this situation is very unlikely */
287 snd_printk(KERN_ERR
"unable to allocate new control numid\n");
290 last_numid
= card
->last_numid
;
296 * snd_ctl_add - add the control instance to the card
297 * @card: the card instance
298 * @kcontrol: the control instance to add
300 * Adds the control instance created via snd_ctl_new() or
301 * snd_ctl_new1() to the given card. Assigns also an unique
302 * numid used for fast search.
304 * Returns zero if successful, or a negative error code on failure.
306 * It frees automatically the control which cannot be added.
308 int snd_ctl_add(struct snd_card
*card
, struct snd_kcontrol
*kcontrol
)
310 struct snd_ctl_elem_id id
;
313 snd_assert(card
!= NULL
, return -EINVAL
);
316 snd_assert(kcontrol
->info
!= NULL
, return -EINVAL
);
318 down_write(&card
->controls_rwsem
);
319 if (snd_ctl_find_id(card
, &id
)) {
320 up_write(&card
->controls_rwsem
);
321 snd_ctl_free_one(kcontrol
);
322 snd_printd(KERN_ERR
"control %i:%i:%i:%s:%i is already present\n",
330 if (snd_ctl_find_hole(card
, kcontrol
->count
) < 0) {
331 up_write(&card
->controls_rwsem
);
332 snd_ctl_free_one(kcontrol
);
335 list_add_tail(&kcontrol
->list
, &card
->controls
);
336 card
->controls_count
+= kcontrol
->count
;
337 kcontrol
->id
.numid
= card
->last_numid
+ 1;
338 card
->last_numid
+= kcontrol
->count
;
339 up_write(&card
->controls_rwsem
);
340 for (idx
= 0; idx
< kcontrol
->count
; idx
++, id
.index
++, id
.numid
++)
341 snd_ctl_notify(card
, SNDRV_CTL_EVENT_MASK_ADD
, &id
);
346 * snd_ctl_remove - remove the control from the card and release it
347 * @card: the card instance
348 * @kcontrol: the control instance to remove
350 * Removes the control from the card and then releases the instance.
351 * You don't need to call snd_ctl_free_one(). You must be in
352 * the write lock - down_write(&card->controls_rwsem).
354 * Returns 0 if successful, or a negative error code on failure.
356 int snd_ctl_remove(struct snd_card
*card
, struct snd_kcontrol
*kcontrol
)
358 struct snd_ctl_elem_id id
;
361 snd_assert(card
!= NULL
&& kcontrol
!= NULL
, return -EINVAL
);
362 list_del(&kcontrol
->list
);
363 card
->controls_count
-= kcontrol
->count
;
365 for (idx
= 0; idx
< kcontrol
->count
; idx
++, id
.index
++, id
.numid
++)
366 snd_ctl_notify(card
, SNDRV_CTL_EVENT_MASK_REMOVE
, &id
);
367 snd_ctl_free_one(kcontrol
);
372 * snd_ctl_remove_id - remove the control of the given id and release it
373 * @card: the card instance
374 * @id: the control id to remove
376 * Finds the control instance with the given id, removes it from the
377 * card list and releases it.
379 * Returns 0 if successful, or a negative error code on failure.
381 int snd_ctl_remove_id(struct snd_card
*card
, struct snd_ctl_elem_id
*id
)
383 struct snd_kcontrol
*kctl
;
386 down_write(&card
->controls_rwsem
);
387 kctl
= snd_ctl_find_id(card
, id
);
389 up_write(&card
->controls_rwsem
);
392 ret
= snd_ctl_remove(card
, kctl
);
393 up_write(&card
->controls_rwsem
);
398 * snd_ctl_remove_unlocked_id - remove the unlocked control of the given id and release it
399 * @file: active control handle
400 * @id: the control id to remove
402 * Finds the control instance with the given id, removes it from the
403 * card list and releases it.
405 * Returns 0 if successful, or a negative error code on failure.
407 static int snd_ctl_remove_unlocked_id(struct snd_ctl_file
* file
,
408 struct snd_ctl_elem_id
*id
)
410 struct snd_card
*card
= file
->card
;
411 struct snd_kcontrol
*kctl
;
414 down_write(&card
->controls_rwsem
);
415 kctl
= snd_ctl_find_id(card
, id
);
417 up_write(&card
->controls_rwsem
);
420 for (idx
= 0; idx
< kctl
->count
; idx
++)
421 if (kctl
->vd
[idx
].owner
!= NULL
&& kctl
->vd
[idx
].owner
!= file
) {
422 up_write(&card
->controls_rwsem
);
425 ret
= snd_ctl_remove(card
, kctl
);
426 up_write(&card
->controls_rwsem
);
431 * snd_ctl_rename_id - replace the id of a control on the card
432 * @card: the card instance
433 * @src_id: the old id
434 * @dst_id: the new id
436 * Finds the control with the old id from the card, and replaces the
437 * id with the new one.
439 * Returns zero if successful, or a negative error code on failure.
441 int snd_ctl_rename_id(struct snd_card
*card
, struct snd_ctl_elem_id
*src_id
,
442 struct snd_ctl_elem_id
*dst_id
)
444 struct snd_kcontrol
*kctl
;
446 down_write(&card
->controls_rwsem
);
447 kctl
= snd_ctl_find_id(card
, src_id
);
449 up_write(&card
->controls_rwsem
);
453 kctl
->id
.numid
= card
->last_numid
+ 1;
454 card
->last_numid
+= kctl
->count
;
455 up_write(&card
->controls_rwsem
);
460 * snd_ctl_find_numid - find the control instance with the given number-id
461 * @card: the card instance
462 * @numid: the number-id to search
464 * Finds the control instance with the given number-id from the card.
466 * Returns the pointer of the instance if found, or NULL if not.
468 * The caller must down card->controls_rwsem before calling this function
469 * (if the race condition can happen).
471 struct snd_kcontrol
*snd_ctl_find_numid(struct snd_card
*card
, unsigned int numid
)
473 struct list_head
*list
;
474 struct snd_kcontrol
*kctl
;
476 snd_assert(card
!= NULL
&& numid
!= 0, return NULL
);
477 list_for_each(list
, &card
->controls
) {
478 kctl
= snd_kcontrol(list
);
479 if (kctl
->id
.numid
<= numid
&& kctl
->id
.numid
+ kctl
->count
> numid
)
486 * snd_ctl_find_id - find the control instance with the given id
487 * @card: the card instance
488 * @id: the id to search
490 * Finds the control instance with the given id from the card.
492 * Returns the pointer of the instance if found, or NULL if not.
494 * The caller must down card->controls_rwsem before calling this function
495 * (if the race condition can happen).
497 struct snd_kcontrol
*snd_ctl_find_id(struct snd_card
*card
,
498 struct snd_ctl_elem_id
*id
)
500 struct list_head
*list
;
501 struct snd_kcontrol
*kctl
;
503 snd_assert(card
!= NULL
&& id
!= NULL
, return NULL
);
505 return snd_ctl_find_numid(card
, id
->numid
);
506 list_for_each(list
, &card
->controls
) {
507 kctl
= snd_kcontrol(list
);
508 if (kctl
->id
.iface
!= id
->iface
)
510 if (kctl
->id
.device
!= id
->device
)
512 if (kctl
->id
.subdevice
!= id
->subdevice
)
514 if (strncmp(kctl
->id
.name
, id
->name
, sizeof(kctl
->id
.name
)))
516 if (kctl
->id
.index
> id
->index
)
518 if (kctl
->id
.index
+ kctl
->count
<= id
->index
)
525 static int snd_ctl_card_info(struct snd_card
*card
, struct snd_ctl_file
* ctl
,
526 unsigned int cmd
, void __user
*arg
)
528 struct snd_ctl_card_info
*info
;
530 info
= kzalloc(sizeof(*info
), GFP_KERNEL
);
533 down_read(&snd_ioctl_rwsem
);
534 info
->card
= card
->number
;
535 strlcpy(info
->id
, card
->id
, sizeof(info
->id
));
536 strlcpy(info
->driver
, card
->driver
, sizeof(info
->driver
));
537 strlcpy(info
->name
, card
->shortname
, sizeof(info
->name
));
538 strlcpy(info
->longname
, card
->longname
, sizeof(info
->longname
));
539 strlcpy(info
->mixername
, card
->mixername
, sizeof(info
->mixername
));
540 strlcpy(info
->components
, card
->components
, sizeof(info
->components
));
541 up_read(&snd_ioctl_rwsem
);
542 if (copy_to_user(arg
, info
, sizeof(struct snd_ctl_card_info
))) {
550 static int snd_ctl_elem_list(struct snd_card
*card
,
551 struct snd_ctl_elem_list __user
*_list
)
553 struct list_head
*plist
;
554 struct snd_ctl_elem_list list
;
555 struct snd_kcontrol
*kctl
;
556 struct snd_ctl_elem_id
*dst
, *id
;
557 unsigned int offset
, space
, first
, jidx
;
559 if (copy_from_user(&list
, _list
, sizeof(list
)))
561 offset
= list
.offset
;
564 /* try limit maximum space */
568 /* allocate temporary buffer for atomic operation */
569 dst
= vmalloc(space
* sizeof(struct snd_ctl_elem_id
));
572 down_read(&card
->controls_rwsem
);
573 list
.count
= card
->controls_count
;
574 plist
= card
->controls
.next
;
575 while (plist
!= &card
->controls
) {
578 kctl
= snd_kcontrol(plist
);
579 if (offset
< kctl
->count
)
581 offset
-= kctl
->count
;
586 while (space
> 0 && plist
!= &card
->controls
) {
587 kctl
= snd_kcontrol(plist
);
588 for (jidx
= offset
; space
> 0 && jidx
< kctl
->count
; jidx
++) {
589 snd_ctl_build_ioff(id
, kctl
, jidx
);
597 up_read(&card
->controls_rwsem
);
599 copy_to_user(list
.pids
, dst
,
600 list
.used
* sizeof(struct snd_ctl_elem_id
))) {
606 down_read(&card
->controls_rwsem
);
607 list
.count
= card
->controls_count
;
608 up_read(&card
->controls_rwsem
);
610 if (copy_to_user(_list
, &list
, sizeof(list
)))
615 static int snd_ctl_elem_info(struct snd_ctl_file
*ctl
,
616 struct snd_ctl_elem_info
*info
)
618 struct snd_card
*card
= ctl
->card
;
619 struct snd_kcontrol
*kctl
;
620 struct snd_kcontrol_volatile
*vd
;
621 unsigned int index_offset
;
624 down_read(&card
->controls_rwsem
);
625 kctl
= snd_ctl_find_id(card
, &info
->id
);
627 up_read(&card
->controls_rwsem
);
630 #ifdef CONFIG_SND_DEBUG
633 result
= kctl
->info(kctl
, info
);
635 snd_assert(info
->access
== 0, );
636 index_offset
= snd_ctl_get_ioff(kctl
, &info
->id
);
637 vd
= &kctl
->vd
[index_offset
];
638 snd_ctl_build_ioff(&info
->id
, kctl
, index_offset
);
639 info
->access
= vd
->access
;
641 info
->access
|= SNDRV_CTL_ELEM_ACCESS_LOCK
;
642 if (vd
->owner
== ctl
)
643 info
->access
|= SNDRV_CTL_ELEM_ACCESS_OWNER
;
644 info
->owner
= vd
->owner_pid
;
649 up_read(&card
->controls_rwsem
);
653 static int snd_ctl_elem_info_user(struct snd_ctl_file
*ctl
,
654 struct snd_ctl_elem_info __user
*_info
)
656 struct snd_ctl_elem_info info
;
659 if (copy_from_user(&info
, _info
, sizeof(info
)))
661 snd_power_lock(ctl
->card
);
662 result
= snd_power_wait(ctl
->card
, SNDRV_CTL_POWER_D0
, NULL
);
664 result
= snd_ctl_elem_info(ctl
, &info
);
665 snd_power_unlock(ctl
->card
);
667 if (copy_to_user(_info
, &info
, sizeof(info
)))
672 int snd_ctl_elem_read(struct snd_card
*card
, struct snd_ctl_elem_value
*control
)
674 struct snd_kcontrol
*kctl
;
675 struct snd_kcontrol_volatile
*vd
;
676 unsigned int index_offset
;
677 int result
, indirect
;
679 down_read(&card
->controls_rwsem
);
680 kctl
= snd_ctl_find_id(card
, &control
->id
);
684 index_offset
= snd_ctl_get_ioff(kctl
, &control
->id
);
685 vd
= &kctl
->vd
[index_offset
];
686 indirect
= vd
->access
& SNDRV_CTL_ELEM_ACCESS_INDIRECT
? 1 : 0;
687 if (control
->indirect
!= indirect
) {
690 if ((vd
->access
& SNDRV_CTL_ELEM_ACCESS_READ
) && kctl
->get
!= NULL
) {
691 snd_ctl_build_ioff(&control
->id
, kctl
, index_offset
);
692 result
= kctl
->get(kctl
, control
);
698 up_read(&card
->controls_rwsem
);
702 static int snd_ctl_elem_read_user(struct snd_card
*card
,
703 struct snd_ctl_elem_value __user
*_control
)
705 struct snd_ctl_elem_value
*control
;
708 control
= kmalloc(sizeof(*control
), GFP_KERNEL
);
711 if (copy_from_user(control
, _control
, sizeof(*control
))) {
715 snd_power_lock(card
);
716 result
= snd_power_wait(card
, SNDRV_CTL_POWER_D0
, NULL
);
718 result
= snd_ctl_elem_read(card
, control
);
719 snd_power_unlock(card
);
721 if (copy_to_user(_control
, control
, sizeof(*control
)))
727 int snd_ctl_elem_write(struct snd_card
*card
, struct snd_ctl_file
*file
,
728 struct snd_ctl_elem_value
*control
)
730 struct snd_kcontrol
*kctl
;
731 struct snd_kcontrol_volatile
*vd
;
732 unsigned int index_offset
;
733 int result
, indirect
;
735 down_read(&card
->controls_rwsem
);
736 kctl
= snd_ctl_find_id(card
, &control
->id
);
740 index_offset
= snd_ctl_get_ioff(kctl
, &control
->id
);
741 vd
= &kctl
->vd
[index_offset
];
742 indirect
= vd
->access
& SNDRV_CTL_ELEM_ACCESS_INDIRECT
? 1 : 0;
743 if (control
->indirect
!= indirect
) {
746 if (!(vd
->access
& SNDRV_CTL_ELEM_ACCESS_WRITE
) ||
748 (file
&& vd
->owner
!= NULL
&& vd
->owner
!= file
)) {
751 snd_ctl_build_ioff(&control
->id
, kctl
, index_offset
);
752 result
= kctl
->put(kctl
, control
);
755 up_read(&card
->controls_rwsem
);
756 snd_ctl_notify(card
, SNDRV_CTL_EVENT_MASK_VALUE
, &control
->id
);
761 up_read(&card
->controls_rwsem
);
765 static int snd_ctl_elem_write_user(struct snd_ctl_file
*file
,
766 struct snd_ctl_elem_value __user
*_control
)
768 struct snd_ctl_elem_value
*control
;
769 struct snd_card
*card
;
772 control
= kmalloc(sizeof(*control
), GFP_KERNEL
);
775 if (copy_from_user(control
, _control
, sizeof(*control
))) {
780 snd_power_lock(card
);
781 result
= snd_power_wait(card
, SNDRV_CTL_POWER_D0
, NULL
);
783 result
= snd_ctl_elem_write(card
, file
, control
);
784 snd_power_unlock(card
);
786 if (copy_to_user(_control
, control
, sizeof(*control
)))
792 static int snd_ctl_elem_lock(struct snd_ctl_file
*file
,
793 struct snd_ctl_elem_id __user
*_id
)
795 struct snd_card
*card
= file
->card
;
796 struct snd_ctl_elem_id id
;
797 struct snd_kcontrol
*kctl
;
798 struct snd_kcontrol_volatile
*vd
;
801 if (copy_from_user(&id
, _id
, sizeof(id
)))
803 down_write(&card
->controls_rwsem
);
804 kctl
= snd_ctl_find_id(card
, &id
);
808 vd
= &kctl
->vd
[snd_ctl_get_ioff(kctl
, &id
)];
809 if (vd
->owner
!= NULL
)
813 vd
->owner_pid
= current
->pid
;
817 up_write(&card
->controls_rwsem
);
821 static int snd_ctl_elem_unlock(struct snd_ctl_file
*file
,
822 struct snd_ctl_elem_id __user
*_id
)
824 struct snd_card
*card
= file
->card
;
825 struct snd_ctl_elem_id id
;
826 struct snd_kcontrol
*kctl
;
827 struct snd_kcontrol_volatile
*vd
;
830 if (copy_from_user(&id
, _id
, sizeof(id
)))
832 down_write(&card
->controls_rwsem
);
833 kctl
= snd_ctl_find_id(card
, &id
);
837 vd
= &kctl
->vd
[snd_ctl_get_ioff(kctl
, &id
)];
838 if (vd
->owner
== NULL
)
840 else if (vd
->owner
!= file
)
848 up_write(&card
->controls_rwsem
);
852 struct user_element
{
853 struct snd_ctl_elem_info info
;
854 void *elem_data
; /* element data */
855 unsigned long elem_data_size
; /* size of element data in bytes */
856 void *priv_data
; /* private data (like strings for enumerated type) */
857 unsigned long priv_data_size
; /* size of private data in bytes */
860 static int snd_ctl_elem_user_info(struct snd_kcontrol
*kcontrol
,
861 struct snd_ctl_elem_info
*uinfo
)
863 struct user_element
*ue
= kcontrol
->private_data
;
869 static int snd_ctl_elem_user_get(struct snd_kcontrol
*kcontrol
,
870 struct snd_ctl_elem_value
*ucontrol
)
872 struct user_element
*ue
= kcontrol
->private_data
;
874 memcpy(&ucontrol
->value
, ue
->elem_data
, ue
->elem_data_size
);
878 static int snd_ctl_elem_user_put(struct snd_kcontrol
*kcontrol
,
879 struct snd_ctl_elem_value
*ucontrol
)
882 struct user_element
*ue
= kcontrol
->private_data
;
884 change
= memcmp(&ucontrol
->value
, ue
->elem_data
, ue
->elem_data_size
) != 0;
886 memcpy(ue
->elem_data
, &ucontrol
->value
, ue
->elem_data_size
);
890 static void snd_ctl_elem_user_free(struct snd_kcontrol
*kcontrol
)
892 kfree(kcontrol
->private_data
);
895 static int snd_ctl_elem_add(struct snd_ctl_file
*file
,
896 struct snd_ctl_elem_info
*info
, int replace
)
898 struct snd_card
*card
= file
->card
;
899 struct snd_kcontrol kctl
, *_kctl
;
902 struct user_element
*ue
;
905 if (card
->user_ctl_count
>= MAX_USER_CONTROLS
)
907 if (info
->count
> 1024)
909 access
= info
->access
== 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE
:
910 (info
->access
& (SNDRV_CTL_ELEM_ACCESS_READWRITE
|
911 SNDRV_CTL_ELEM_ACCESS_INACTIVE
));
913 memset(&kctl
, 0, sizeof(kctl
));
914 down_write(&card
->controls_rwsem
);
915 _kctl
= snd_ctl_find_id(card
, &info
->id
);
919 err
= snd_ctl_remove(card
, _kctl
);
926 up_write(&card
->controls_rwsem
);
929 memcpy(&kctl
.id
, &info
->id
, sizeof(info
->id
));
930 kctl
.count
= info
->owner
? info
->owner
: 1;
931 access
|= SNDRV_CTL_ELEM_ACCESS_USER
;
932 kctl
.info
= snd_ctl_elem_user_info
;
933 if (access
& SNDRV_CTL_ELEM_ACCESS_READ
)
934 kctl
.get
= snd_ctl_elem_user_get
;
935 if (access
& SNDRV_CTL_ELEM_ACCESS_WRITE
)
936 kctl
.put
= snd_ctl_elem_user_put
;
937 switch (info
->type
) {
938 case SNDRV_CTL_ELEM_TYPE_BOOLEAN
:
939 private_size
= sizeof(char);
940 if (info
->count
> 128)
943 case SNDRV_CTL_ELEM_TYPE_INTEGER
:
944 private_size
= sizeof(long);
945 if (info
->count
> 128)
948 case SNDRV_CTL_ELEM_TYPE_INTEGER64
:
949 private_size
= sizeof(long long);
950 if (info
->count
> 64)
953 case SNDRV_CTL_ELEM_TYPE_BYTES
:
954 private_size
= sizeof(unsigned char);
955 if (info
->count
> 512)
958 case SNDRV_CTL_ELEM_TYPE_IEC958
:
959 private_size
= sizeof(struct snd_aes_iec958
);
960 if (info
->count
!= 1)
966 private_size
*= info
->count
;
967 ue
= kzalloc(sizeof(struct user_element
) + private_size
, GFP_KERNEL
);
971 ue
->elem_data
= (char *)ue
+ sizeof(*ue
);
972 ue
->elem_data_size
= private_size
;
973 kctl
.private_free
= snd_ctl_elem_user_free
;
974 _kctl
= snd_ctl_new(&kctl
, access
);
979 _kctl
->private_data
= ue
;
980 for (idx
= 0; idx
< _kctl
->count
; idx
++)
981 _kctl
->vd
[idx
].owner
= file
;
982 err
= snd_ctl_add(card
, _kctl
);
986 down_write(&card
->controls_rwsem
);
987 card
->user_ctl_count
++;
988 up_write(&card
->controls_rwsem
);
993 static int snd_ctl_elem_add_user(struct snd_ctl_file
*file
,
994 struct snd_ctl_elem_info __user
*_info
, int replace
)
996 struct snd_ctl_elem_info info
;
997 if (copy_from_user(&info
, _info
, sizeof(info
)))
999 return snd_ctl_elem_add(file
, &info
, replace
);
1002 static int snd_ctl_elem_remove(struct snd_ctl_file
*file
,
1003 struct snd_ctl_elem_id __user
*_id
)
1005 struct snd_ctl_elem_id id
;
1008 if (copy_from_user(&id
, _id
, sizeof(id
)))
1010 err
= snd_ctl_remove_unlocked_id(file
, &id
);
1012 struct snd_card
*card
= file
->card
;
1013 down_write(&card
->controls_rwsem
);
1014 card
->user_ctl_count
--;
1015 up_write(&card
->controls_rwsem
);
1020 static int snd_ctl_subscribe_events(struct snd_ctl_file
*file
, int __user
*ptr
)
1023 if (get_user(subscribe
, ptr
))
1025 if (subscribe
< 0) {
1026 subscribe
= file
->subscribed
;
1027 if (put_user(subscribe
, ptr
))
1032 file
->subscribed
= 1;
1034 } else if (file
->subscribed
) {
1035 snd_ctl_empty_read_queue(file
);
1036 file
->subscribed
= 0;
1041 static long snd_ctl_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1043 struct snd_ctl_file
*ctl
;
1044 struct snd_card
*card
;
1045 struct list_head
*list
;
1046 struct snd_kctl_ioctl
*p
;
1047 void __user
*argp
= (void __user
*)arg
;
1048 int __user
*ip
= argp
;
1051 ctl
= file
->private_data
;
1053 snd_assert(card
!= NULL
, return -ENXIO
);
1055 case SNDRV_CTL_IOCTL_PVERSION
:
1056 return put_user(SNDRV_CTL_VERSION
, ip
) ? -EFAULT
: 0;
1057 case SNDRV_CTL_IOCTL_CARD_INFO
:
1058 return snd_ctl_card_info(card
, ctl
, cmd
, argp
);
1059 case SNDRV_CTL_IOCTL_ELEM_LIST
:
1060 return snd_ctl_elem_list(ctl
->card
, argp
);
1061 case SNDRV_CTL_IOCTL_ELEM_INFO
:
1062 return snd_ctl_elem_info_user(ctl
, argp
);
1063 case SNDRV_CTL_IOCTL_ELEM_READ
:
1064 return snd_ctl_elem_read_user(ctl
->card
, argp
);
1065 case SNDRV_CTL_IOCTL_ELEM_WRITE
:
1066 return snd_ctl_elem_write_user(ctl
, argp
);
1067 case SNDRV_CTL_IOCTL_ELEM_LOCK
:
1068 return snd_ctl_elem_lock(ctl
, argp
);
1069 case SNDRV_CTL_IOCTL_ELEM_UNLOCK
:
1070 return snd_ctl_elem_unlock(ctl
, argp
);
1071 case SNDRV_CTL_IOCTL_ELEM_ADD
:
1072 return snd_ctl_elem_add_user(ctl
, argp
, 0);
1073 case SNDRV_CTL_IOCTL_ELEM_REPLACE
:
1074 return snd_ctl_elem_add_user(ctl
, argp
, 1);
1075 case SNDRV_CTL_IOCTL_ELEM_REMOVE
:
1076 return snd_ctl_elem_remove(ctl
, argp
);
1077 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS
:
1078 return snd_ctl_subscribe_events(ctl
, ip
);
1079 case SNDRV_CTL_IOCTL_POWER
:
1080 return -ENOPROTOOPT
;
1081 case SNDRV_CTL_IOCTL_POWER_STATE
:
1083 return put_user(card
->power_state
, ip
) ? -EFAULT
: 0;
1085 return put_user(SNDRV_CTL_POWER_D0
, ip
) ? -EFAULT
: 0;
1088 down_read(&snd_ioctl_rwsem
);
1089 list_for_each(list
, &snd_control_ioctls
) {
1090 p
= list_entry(list
, struct snd_kctl_ioctl
, list
);
1091 err
= p
->fioctl(card
, ctl
, cmd
, arg
);
1092 if (err
!= -ENOIOCTLCMD
) {
1093 up_read(&snd_ioctl_rwsem
);
1097 up_read(&snd_ioctl_rwsem
);
1098 snd_printdd("unknown ioctl = 0x%x\n", cmd
);
1102 static ssize_t
snd_ctl_read(struct file
*file
, char __user
*buffer
,
1103 size_t count
, loff_t
* offset
)
1105 struct snd_ctl_file
*ctl
;
1109 ctl
= file
->private_data
;
1110 snd_assert(ctl
!= NULL
&& ctl
->card
!= NULL
, return -ENXIO
);
1111 if (!ctl
->subscribed
)
1113 if (count
< sizeof(struct snd_ctl_event
))
1115 spin_lock_irq(&ctl
->read_lock
);
1116 while (count
>= sizeof(struct snd_ctl_event
)) {
1117 struct snd_ctl_event ev
;
1118 struct snd_kctl_event
*kev
;
1119 while (list_empty(&ctl
->events
)) {
1121 if ((file
->f_flags
& O_NONBLOCK
) != 0 || result
> 0) {
1125 init_waitqueue_entry(&wait
, current
);
1126 add_wait_queue(&ctl
->change_sleep
, &wait
);
1127 set_current_state(TASK_INTERRUPTIBLE
);
1128 spin_unlock_irq(&ctl
->read_lock
);
1130 remove_wait_queue(&ctl
->change_sleep
, &wait
);
1131 if (signal_pending(current
))
1132 return result
> 0 ? result
: -ERESTARTSYS
;
1133 spin_lock_irq(&ctl
->read_lock
);
1135 kev
= snd_kctl_event(ctl
->events
.next
);
1136 ev
.type
= SNDRV_CTL_EVENT_ELEM
;
1137 ev
.data
.elem
.mask
= kev
->mask
;
1138 ev
.data
.elem
.id
= kev
->id
;
1139 list_del(&kev
->list
);
1140 spin_unlock_irq(&ctl
->read_lock
);
1142 if (copy_to_user(buffer
, &ev
, sizeof(struct snd_ctl_event
))) {
1146 spin_lock_irq(&ctl
->read_lock
);
1147 buffer
+= sizeof(struct snd_ctl_event
);
1148 count
-= sizeof(struct snd_ctl_event
);
1149 result
+= sizeof(struct snd_ctl_event
);
1152 spin_unlock_irq(&ctl
->read_lock
);
1154 return result
> 0 ? result
: err
;
1157 static unsigned int snd_ctl_poll(struct file
*file
, poll_table
* wait
)
1160 struct snd_ctl_file
*ctl
;
1162 ctl
= file
->private_data
;
1163 if (!ctl
->subscribed
)
1165 poll_wait(file
, &ctl
->change_sleep
, wait
);
1168 if (!list_empty(&ctl
->events
))
1169 mask
|= POLLIN
| POLLRDNORM
;
1175 * register the device-specific control-ioctls.
1176 * called from each device manager like pcm.c, hwdep.c, etc.
1178 static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn
, struct list_head
*lists
)
1180 struct snd_kctl_ioctl
*pn
;
1182 pn
= kzalloc(sizeof(struct snd_kctl_ioctl
), GFP_KERNEL
);
1186 down_write(&snd_ioctl_rwsem
);
1187 list_add_tail(&pn
->list
, lists
);
1188 up_write(&snd_ioctl_rwsem
);
1192 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn
)
1194 return _snd_ctl_register_ioctl(fcn
, &snd_control_ioctls
);
1197 #ifdef CONFIG_COMPAT
1198 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn
)
1200 return _snd_ctl_register_ioctl(fcn
, &snd_control_compat_ioctls
);
1205 * de-register the device-specific control-ioctls.
1207 static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn
,
1208 struct list_head
*lists
)
1210 struct list_head
*list
;
1211 struct snd_kctl_ioctl
*p
;
1213 snd_assert(fcn
!= NULL
, return -EINVAL
);
1214 down_write(&snd_ioctl_rwsem
);
1215 list_for_each(list
, lists
) {
1216 p
= list_entry(list
, struct snd_kctl_ioctl
, list
);
1217 if (p
->fioctl
== fcn
) {
1219 up_write(&snd_ioctl_rwsem
);
1224 up_write(&snd_ioctl_rwsem
);
1229 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn
)
1231 return _snd_ctl_unregister_ioctl(fcn
, &snd_control_ioctls
);
1234 #ifdef CONFIG_COMPAT
1235 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn
)
1237 return _snd_ctl_unregister_ioctl(fcn
, &snd_control_compat_ioctls
);
1242 static int snd_ctl_fasync(int fd
, struct file
* file
, int on
)
1244 struct snd_ctl_file
*ctl
;
1246 ctl
= file
->private_data
;
1247 err
= fasync_helper(fd
, file
, on
, &ctl
->fasync
);
1256 #ifdef CONFIG_COMPAT
1257 #include "control_compat.c"
1259 #define snd_ctl_ioctl_compat NULL
1266 static struct file_operations snd_ctl_f_ops
=
1268 .owner
= THIS_MODULE
,
1269 .read
= snd_ctl_read
,
1270 .open
= snd_ctl_open
,
1271 .release
= snd_ctl_release
,
1272 .poll
= snd_ctl_poll
,
1273 .unlocked_ioctl
= snd_ctl_ioctl
,
1274 .compat_ioctl
= snd_ctl_ioctl_compat
,
1275 .fasync
= snd_ctl_fasync
,
1279 * registration of the control device
1281 static int snd_ctl_dev_register(struct snd_device
*device
)
1283 struct snd_card
*card
= device
->device_data
;
1287 snd_assert(card
!= NULL
, return -ENXIO
);
1288 cardnum
= card
->number
;
1289 snd_assert(cardnum
>= 0 && cardnum
< SNDRV_CARDS
, return -ENXIO
);
1290 sprintf(name
, "controlC%i", cardnum
);
1291 if ((err
= snd_register_device(SNDRV_DEVICE_TYPE_CONTROL
, card
, -1,
1292 &snd_ctl_f_ops
, card
, name
)) < 0)
1298 * disconnection of the control device
1300 static int snd_ctl_dev_disconnect(struct snd_device
*device
)
1302 struct snd_card
*card
= device
->device_data
;
1303 struct list_head
*flist
;
1304 struct snd_ctl_file
*ctl
;
1306 down_read(&card
->controls_rwsem
);
1307 list_for_each(flist
, &card
->ctl_files
) {
1308 ctl
= snd_ctl_file(flist
);
1309 wake_up(&ctl
->change_sleep
);
1310 kill_fasync(&ctl
->fasync
, SIGIO
, POLL_ERR
);
1312 up_read(&card
->controls_rwsem
);
1319 static int snd_ctl_dev_free(struct snd_device
*device
)
1321 struct snd_card
*card
= device
->device_data
;
1322 struct snd_kcontrol
*control
;
1324 down_write(&card
->controls_rwsem
);
1325 while (!list_empty(&card
->controls
)) {
1326 control
= snd_kcontrol(card
->controls
.next
);
1327 snd_ctl_remove(card
, control
);
1329 up_write(&card
->controls_rwsem
);
1334 * de-registration of the control device
1336 static int snd_ctl_dev_unregister(struct snd_device
*device
)
1338 struct snd_card
*card
= device
->device_data
;
1341 snd_assert(card
!= NULL
, return -ENXIO
);
1342 cardnum
= card
->number
;
1343 snd_assert(cardnum
>= 0 && cardnum
< SNDRV_CARDS
, return -ENXIO
);
1344 if ((err
= snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL
,
1347 return snd_ctl_dev_free(device
);
1351 * create control core:
1352 * called from init.c
1354 int snd_ctl_create(struct snd_card
*card
)
1356 static struct snd_device_ops ops
= {
1357 .dev_free
= snd_ctl_dev_free
,
1358 .dev_register
= snd_ctl_dev_register
,
1359 .dev_disconnect
= snd_ctl_dev_disconnect
,
1360 .dev_unregister
= snd_ctl_dev_unregister
1363 snd_assert(card
!= NULL
, return -ENXIO
);
1364 return snd_device_new(card
, SNDRV_DEV_CONTROL
, card
, &ops
);