2 * Routines for driver control interface
3 * Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/threads.h>
23 #include <linux/interrupt.h>
24 #include <linux/module.h>
25 #include <linux/slab.h>
26 #include <linux/vmalloc.h>
27 #include <linux/time.h>
28 #include <sound/core.h>
29 #include <sound/minors.h>
30 #include <sound/info.h>
31 #include <sound/control.h>
33 /* max number of user-defined controls */
34 #define MAX_USER_CONTROLS 32
35 #define MAX_CONTROL_COUNT 1028
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 err
= nonseekable_open(inode
, file
);
59 card
= snd_lookup_minor_data(iminor(inode
), SNDRV_DEVICE_TYPE_CONTROL
);
64 err
= snd_card_file_add(card
, file
);
69 if (!try_module_get(card
->module
)) {
73 ctl
= kzalloc(sizeof(*ctl
), GFP_KERNEL
);
78 INIT_LIST_HEAD(&ctl
->events
);
79 init_waitqueue_head(&ctl
->change_sleep
);
80 spin_lock_init(&ctl
->read_lock
);
82 ctl
->prefer_pcm_subdevice
= -1;
83 ctl
->prefer_rawmidi_subdevice
= -1;
84 ctl
->pid
= get_pid(task_pid(current
));
85 file
->private_data
= ctl
;
86 write_lock_irqsave(&card
->ctl_files_rwlock
, flags
);
87 list_add_tail(&ctl
->list
, &card
->ctl_files
);
88 write_unlock_irqrestore(&card
->ctl_files_rwlock
, flags
);
93 module_put(card
->module
);
95 snd_card_file_remove(card
, file
);
102 static void snd_ctl_empty_read_queue(struct snd_ctl_file
* ctl
)
105 struct snd_kctl_event
*cread
;
107 spin_lock_irqsave(&ctl
->read_lock
, flags
);
108 while (!list_empty(&ctl
->events
)) {
109 cread
= snd_kctl_event(ctl
->events
.next
);
110 list_del(&cread
->list
);
113 spin_unlock_irqrestore(&ctl
->read_lock
, flags
);
116 static int snd_ctl_release(struct inode
*inode
, struct file
*file
)
119 struct snd_card
*card
;
120 struct snd_ctl_file
*ctl
;
121 struct snd_kcontrol
*control
;
124 ctl
= file
->private_data
;
125 file
->private_data
= NULL
;
127 write_lock_irqsave(&card
->ctl_files_rwlock
, flags
);
128 list_del(&ctl
->list
);
129 write_unlock_irqrestore(&card
->ctl_files_rwlock
, flags
);
130 down_write(&card
->controls_rwsem
);
131 list_for_each_entry(control
, &card
->controls
, list
)
132 for (idx
= 0; idx
< control
->count
; idx
++)
133 if (control
->vd
[idx
].owner
== ctl
)
134 control
->vd
[idx
].owner
= NULL
;
135 up_write(&card
->controls_rwsem
);
136 snd_ctl_empty_read_queue(ctl
);
139 module_put(card
->module
);
140 snd_card_file_remove(card
, file
);
144 void snd_ctl_notify(struct snd_card
*card
, unsigned int mask
,
145 struct snd_ctl_elem_id
*id
)
148 struct snd_ctl_file
*ctl
;
149 struct snd_kctl_event
*ev
;
151 if (snd_BUG_ON(!card
|| !id
))
153 read_lock(&card
->ctl_files_rwlock
);
154 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
155 card
->mixer_oss_change_count
++;
157 list_for_each_entry(ctl
, &card
->ctl_files
, list
) {
158 if (!ctl
->subscribed
)
160 spin_lock_irqsave(&ctl
->read_lock
, flags
);
161 list_for_each_entry(ev
, &ctl
->events
, list
) {
162 if (ev
->id
.numid
== id
->numid
) {
167 ev
= kzalloc(sizeof(*ev
), GFP_ATOMIC
);
171 list_add_tail(&ev
->list
, &ctl
->events
);
173 snd_printk(KERN_ERR
"No memory available to allocate event\n");
176 wake_up(&ctl
->change_sleep
);
177 spin_unlock_irqrestore(&ctl
->read_lock
, flags
);
178 kill_fasync(&ctl
->fasync
, SIGIO
, POLL_IN
);
180 read_unlock(&card
->ctl_files_rwlock
);
183 EXPORT_SYMBOL(snd_ctl_notify
);
186 * snd_ctl_new - create a control instance from the template
187 * @control: the control template
188 * @access: the default control access
190 * Allocates a new struct snd_kcontrol instance and copies the given template
191 * to the new instance. It does not copy volatile data (access).
193 * Return: The pointer of the new instance, or %NULL on failure.
195 static struct snd_kcontrol
*snd_ctl_new(struct snd_kcontrol
*control
,
198 struct snd_kcontrol
*kctl
;
201 if (snd_BUG_ON(!control
|| !control
->count
))
204 if (control
->count
> MAX_CONTROL_COUNT
)
207 kctl
= kzalloc(sizeof(*kctl
) + sizeof(struct snd_kcontrol_volatile
) * control
->count
, GFP_KERNEL
);
209 snd_printk(KERN_ERR
"Cannot allocate control instance\n");
213 for (idx
= 0; idx
< kctl
->count
; idx
++)
214 kctl
->vd
[idx
].access
= access
;
219 * snd_ctl_new1 - create a control instance from the template
220 * @ncontrol: the initialization record
221 * @private_data: the private data to set
223 * Allocates a new struct snd_kcontrol instance and initialize from the given
224 * template. When the access field of ncontrol is 0, it's assumed as
225 * READWRITE access. When the count field is 0, it's assumes as one.
227 * Return: The pointer of the newly generated instance, or %NULL on failure.
229 struct snd_kcontrol
*snd_ctl_new1(const struct snd_kcontrol_new
*ncontrol
,
232 struct snd_kcontrol kctl
;
235 if (snd_BUG_ON(!ncontrol
|| !ncontrol
->info
))
237 memset(&kctl
, 0, sizeof(kctl
));
238 kctl
.id
.iface
= ncontrol
->iface
;
239 kctl
.id
.device
= ncontrol
->device
;
240 kctl
.id
.subdevice
= ncontrol
->subdevice
;
241 if (ncontrol
->name
) {
242 strlcpy(kctl
.id
.name
, ncontrol
->name
, sizeof(kctl
.id
.name
));
243 if (strcmp(ncontrol
->name
, kctl
.id
.name
) != 0)
244 snd_printk(KERN_WARNING
245 "Control name '%s' truncated to '%s'\n",
246 ncontrol
->name
, kctl
.id
.name
);
248 kctl
.id
.index
= ncontrol
->index
;
249 kctl
.count
= ncontrol
->count
? ncontrol
->count
: 1;
250 access
= ncontrol
->access
== 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE
:
251 (ncontrol
->access
& (SNDRV_CTL_ELEM_ACCESS_READWRITE
|
252 SNDRV_CTL_ELEM_ACCESS_VOLATILE
|
253 SNDRV_CTL_ELEM_ACCESS_INACTIVE
|
254 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE
|
255 SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND
|
256 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK
));
257 kctl
.info
= ncontrol
->info
;
258 kctl
.get
= ncontrol
->get
;
259 kctl
.put
= ncontrol
->put
;
260 kctl
.tlv
.p
= ncontrol
->tlv
.p
;
261 kctl
.private_value
= ncontrol
->private_value
;
262 kctl
.private_data
= private_data
;
263 return snd_ctl_new(&kctl
, access
);
266 EXPORT_SYMBOL(snd_ctl_new1
);
269 * snd_ctl_free_one - release the control instance
270 * @kcontrol: the control instance
272 * Releases the control instance created via snd_ctl_new()
274 * Don't call this after the control was added to the card.
276 void snd_ctl_free_one(struct snd_kcontrol
*kcontrol
)
279 if (kcontrol
->private_free
)
280 kcontrol
->private_free(kcontrol
);
285 EXPORT_SYMBOL(snd_ctl_free_one
);
287 static bool snd_ctl_remove_numid_conflict(struct snd_card
*card
,
290 struct snd_kcontrol
*kctl
;
292 /* Make sure that the ids assigned to the control do not wrap around */
293 if (card
->last_numid
>= UINT_MAX
- count
)
294 card
->last_numid
= 0;
296 list_for_each_entry(kctl
, &card
->controls
, list
) {
297 if (kctl
->id
.numid
< card
->last_numid
+ 1 + count
&&
298 kctl
->id
.numid
+ kctl
->count
> card
->last_numid
+ 1) {
299 card
->last_numid
= kctl
->id
.numid
+ kctl
->count
- 1;
306 static int snd_ctl_find_hole(struct snd_card
*card
, unsigned int count
)
308 unsigned int iter
= 100000;
310 while (snd_ctl_remove_numid_conflict(card
, count
)) {
312 /* this situation is very unlikely */
313 snd_printk(KERN_ERR
"unable to allocate new control numid\n");
321 * snd_ctl_add - add the control instance to the card
322 * @card: the card instance
323 * @kcontrol: the control instance to add
325 * Adds the control instance created via snd_ctl_new() or
326 * snd_ctl_new1() to the given card. Assigns also an unique
327 * numid used for fast search.
329 * It frees automatically the control which cannot be added.
331 * Return: Zero if successful, or a negative error code on failure.
334 int snd_ctl_add(struct snd_card
*card
, struct snd_kcontrol
*kcontrol
)
336 struct snd_ctl_elem_id id
;
343 if (snd_BUG_ON(!card
|| !kcontrol
->info
))
346 if (id
.index
> UINT_MAX
- kcontrol
->count
)
349 down_write(&card
->controls_rwsem
);
350 if (snd_ctl_find_id(card
, &id
)) {
351 up_write(&card
->controls_rwsem
);
352 snd_printd(KERN_ERR
"control %i:%i:%i:%s:%i is already present\n",
361 if (snd_ctl_find_hole(card
, kcontrol
->count
) < 0) {
362 up_write(&card
->controls_rwsem
);
366 list_add_tail(&kcontrol
->list
, &card
->controls
);
367 card
->controls_count
+= kcontrol
->count
;
368 kcontrol
->id
.numid
= card
->last_numid
+ 1;
369 card
->last_numid
+= kcontrol
->count
;
370 count
= kcontrol
->count
;
371 up_write(&card
->controls_rwsem
);
372 for (idx
= 0; idx
< count
; idx
++, id
.index
++, id
.numid
++)
373 snd_ctl_notify(card
, SNDRV_CTL_EVENT_MASK_ADD
, &id
);
377 snd_ctl_free_one(kcontrol
);
381 EXPORT_SYMBOL(snd_ctl_add
);
384 * snd_ctl_replace - replace the control instance of the card
385 * @card: the card instance
386 * @kcontrol: the control instance to replace
387 * @add_on_replace: add the control if not already added
389 * Replaces the given control. If the given control does not exist
390 * and the add_on_replace flag is set, the control is added. If the
391 * control exists, it is destroyed first.
393 * It frees automatically the control which cannot be added or replaced.
395 * Return: Zero if successful, or a negative error code on failure.
397 int snd_ctl_replace(struct snd_card
*card
, struct snd_kcontrol
*kcontrol
,
400 struct snd_ctl_elem_id id
;
403 struct snd_kcontrol
*old
;
408 if (snd_BUG_ON(!card
|| !kcontrol
->info
)) {
413 down_write(&card
->controls_rwsem
);
414 old
= snd_ctl_find_id(card
, &id
);
418 up_write(&card
->controls_rwsem
);
422 ret
= snd_ctl_remove(card
, old
);
424 up_write(&card
->controls_rwsem
);
428 if (snd_ctl_find_hole(card
, kcontrol
->count
) < 0) {
429 up_write(&card
->controls_rwsem
);
433 list_add_tail(&kcontrol
->list
, &card
->controls
);
434 card
->controls_count
+= kcontrol
->count
;
435 kcontrol
->id
.numid
= card
->last_numid
+ 1;
436 card
->last_numid
+= kcontrol
->count
;
437 count
= kcontrol
->count
;
438 up_write(&card
->controls_rwsem
);
439 for (idx
= 0; idx
< count
; idx
++, id
.index
++, id
.numid
++)
440 snd_ctl_notify(card
, SNDRV_CTL_EVENT_MASK_ADD
, &id
);
444 snd_ctl_free_one(kcontrol
);
447 EXPORT_SYMBOL(snd_ctl_replace
);
450 * snd_ctl_remove - remove the control from the card and release it
451 * @card: the card instance
452 * @kcontrol: the control instance to remove
454 * Removes the control from the card and then releases the instance.
455 * You don't need to call snd_ctl_free_one(). You must be in
456 * the write lock - down_write(&card->controls_rwsem).
458 * Return: 0 if successful, or a negative error code on failure.
460 int snd_ctl_remove(struct snd_card
*card
, struct snd_kcontrol
*kcontrol
)
462 struct snd_ctl_elem_id id
;
465 if (snd_BUG_ON(!card
|| !kcontrol
))
467 list_del(&kcontrol
->list
);
468 card
->controls_count
-= kcontrol
->count
;
470 for (idx
= 0; idx
< kcontrol
->count
; idx
++, id
.index
++, id
.numid
++)
471 snd_ctl_notify(card
, SNDRV_CTL_EVENT_MASK_REMOVE
, &id
);
472 snd_ctl_free_one(kcontrol
);
476 EXPORT_SYMBOL(snd_ctl_remove
);
479 * snd_ctl_remove_id - remove the control of the given id and release it
480 * @card: the card instance
481 * @id: the control id to remove
483 * Finds the control instance with the given id, removes it from the
484 * card list and releases it.
486 * Return: 0 if successful, or a negative error code on failure.
488 int snd_ctl_remove_id(struct snd_card
*card
, struct snd_ctl_elem_id
*id
)
490 struct snd_kcontrol
*kctl
;
493 down_write(&card
->controls_rwsem
);
494 kctl
= snd_ctl_find_id(card
, id
);
496 up_write(&card
->controls_rwsem
);
499 ret
= snd_ctl_remove(card
, kctl
);
500 up_write(&card
->controls_rwsem
);
504 EXPORT_SYMBOL(snd_ctl_remove_id
);
507 * snd_ctl_remove_user_ctl - remove and release the unlocked user control
508 * @file: active control handle
509 * @id: the control id to remove
511 * Finds the control instance with the given id, removes it from the
512 * card list and releases it.
514 * Return: 0 if successful, or a negative error code on failure.
516 static int snd_ctl_remove_user_ctl(struct snd_ctl_file
* file
,
517 struct snd_ctl_elem_id
*id
)
519 struct snd_card
*card
= file
->card
;
520 struct snd_kcontrol
*kctl
;
523 down_write(&card
->controls_rwsem
);
524 kctl
= snd_ctl_find_id(card
, id
);
529 if (!(kctl
->vd
[0].access
& SNDRV_CTL_ELEM_ACCESS_USER
)) {
533 for (idx
= 0; idx
< kctl
->count
; idx
++)
534 if (kctl
->vd
[idx
].owner
!= NULL
&& kctl
->vd
[idx
].owner
!= file
) {
538 ret
= snd_ctl_remove(card
, kctl
);
541 card
->user_ctl_count
--;
543 up_write(&card
->controls_rwsem
);
548 * snd_ctl_activate_id - activate/inactivate the control of the given id
549 * @card: the card instance
550 * @id: the control id to activate/inactivate
551 * @active: non-zero to activate
553 * Finds the control instance with the given id, and activate or
554 * inactivate the control together with notification, if changed.
556 * Return: 0 if unchanged, 1 if changed, or a negative error code on failure.
558 int snd_ctl_activate_id(struct snd_card
*card
, struct snd_ctl_elem_id
*id
,
561 struct snd_kcontrol
*kctl
;
562 struct snd_kcontrol_volatile
*vd
;
563 unsigned int index_offset
;
566 down_write(&card
->controls_rwsem
);
567 kctl
= snd_ctl_find_id(card
, id
);
572 index_offset
= snd_ctl_get_ioff(kctl
, &kctl
->id
);
573 vd
= &kctl
->vd
[index_offset
];
576 if (!(vd
->access
& SNDRV_CTL_ELEM_ACCESS_INACTIVE
))
578 vd
->access
&= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE
;
580 if (vd
->access
& SNDRV_CTL_ELEM_ACCESS_INACTIVE
)
582 vd
->access
|= SNDRV_CTL_ELEM_ACCESS_INACTIVE
;
586 up_write(&card
->controls_rwsem
);
588 snd_ctl_notify(card
, SNDRV_CTL_EVENT_MASK_INFO
, id
);
591 EXPORT_SYMBOL_GPL(snd_ctl_activate_id
);
594 * snd_ctl_rename_id - replace the id of a control on the card
595 * @card: the card instance
596 * @src_id: the old id
597 * @dst_id: the new id
599 * Finds the control with the old id from the card, and replaces the
600 * id with the new one.
602 * Return: Zero if successful, or a negative error code on failure.
604 int snd_ctl_rename_id(struct snd_card
*card
, struct snd_ctl_elem_id
*src_id
,
605 struct snd_ctl_elem_id
*dst_id
)
607 struct snd_kcontrol
*kctl
;
609 down_write(&card
->controls_rwsem
);
610 kctl
= snd_ctl_find_id(card
, src_id
);
612 up_write(&card
->controls_rwsem
);
616 kctl
->id
.numid
= card
->last_numid
+ 1;
617 card
->last_numid
+= kctl
->count
;
618 up_write(&card
->controls_rwsem
);
622 EXPORT_SYMBOL(snd_ctl_rename_id
);
625 * snd_ctl_find_numid - find the control instance with the given number-id
626 * @card: the card instance
627 * @numid: the number-id to search
629 * Finds the control instance with the given number-id from the card.
631 * The caller must down card->controls_rwsem before calling this function
632 * (if the race condition can happen).
634 * Return: The pointer of the instance if found, or %NULL if not.
637 struct snd_kcontrol
*snd_ctl_find_numid(struct snd_card
*card
, unsigned int numid
)
639 struct snd_kcontrol
*kctl
;
641 if (snd_BUG_ON(!card
|| !numid
))
643 list_for_each_entry(kctl
, &card
->controls
, list
) {
644 if (kctl
->id
.numid
<= numid
&& kctl
->id
.numid
+ kctl
->count
> numid
)
650 EXPORT_SYMBOL(snd_ctl_find_numid
);
653 * snd_ctl_find_id - find the control instance with the given id
654 * @card: the card instance
655 * @id: the id to search
657 * Finds the control instance with the given id from the card.
659 * The caller must down card->controls_rwsem before calling this function
660 * (if the race condition can happen).
662 * Return: The pointer of the instance if found, or %NULL if not.
665 struct snd_kcontrol
*snd_ctl_find_id(struct snd_card
*card
,
666 struct snd_ctl_elem_id
*id
)
668 struct snd_kcontrol
*kctl
;
670 if (snd_BUG_ON(!card
|| !id
))
673 return snd_ctl_find_numid(card
, id
->numid
);
674 list_for_each_entry(kctl
, &card
->controls
, list
) {
675 if (kctl
->id
.iface
!= id
->iface
)
677 if (kctl
->id
.device
!= id
->device
)
679 if (kctl
->id
.subdevice
!= id
->subdevice
)
681 if (strncmp(kctl
->id
.name
, id
->name
, sizeof(kctl
->id
.name
)))
683 if (kctl
->id
.index
> id
->index
)
685 if (kctl
->id
.index
+ kctl
->count
<= id
->index
)
692 EXPORT_SYMBOL(snd_ctl_find_id
);
694 static int snd_ctl_card_info(struct snd_card
*card
, struct snd_ctl_file
* ctl
,
695 unsigned int cmd
, void __user
*arg
)
697 struct snd_ctl_card_info
*info
;
699 info
= kzalloc(sizeof(*info
), GFP_KERNEL
);
702 down_read(&snd_ioctl_rwsem
);
703 info
->card
= card
->number
;
704 strlcpy(info
->id
, card
->id
, sizeof(info
->id
));
705 strlcpy(info
->driver
, card
->driver
, sizeof(info
->driver
));
706 strlcpy(info
->name
, card
->shortname
, sizeof(info
->name
));
707 strlcpy(info
->longname
, card
->longname
, sizeof(info
->longname
));
708 strlcpy(info
->mixername
, card
->mixername
, sizeof(info
->mixername
));
709 strlcpy(info
->components
, card
->components
, sizeof(info
->components
));
710 up_read(&snd_ioctl_rwsem
);
711 if (copy_to_user(arg
, info
, sizeof(struct snd_ctl_card_info
))) {
719 static int snd_ctl_elem_list(struct snd_card
*card
,
720 struct snd_ctl_elem_list __user
*_list
)
722 struct list_head
*plist
;
723 struct snd_ctl_elem_list list
;
724 struct snd_kcontrol
*kctl
;
725 struct snd_ctl_elem_id
*dst
, *id
;
726 unsigned int offset
, space
, jidx
;
728 if (copy_from_user(&list
, _list
, sizeof(list
)))
730 offset
= list
.offset
;
732 /* try limit maximum space */
736 /* allocate temporary buffer for atomic operation */
737 dst
= vmalloc(space
* sizeof(struct snd_ctl_elem_id
));
740 down_read(&card
->controls_rwsem
);
741 list
.count
= card
->controls_count
;
742 plist
= card
->controls
.next
;
743 while (plist
!= &card
->controls
) {
746 kctl
= snd_kcontrol(plist
);
747 if (offset
< kctl
->count
)
749 offset
-= kctl
->count
;
754 while (space
> 0 && plist
!= &card
->controls
) {
755 kctl
= snd_kcontrol(plist
);
756 for (jidx
= offset
; space
> 0 && jidx
< kctl
->count
; jidx
++) {
757 snd_ctl_build_ioff(id
, kctl
, jidx
);
765 up_read(&card
->controls_rwsem
);
767 copy_to_user(list
.pids
, dst
,
768 list
.used
* sizeof(struct snd_ctl_elem_id
))) {
774 down_read(&card
->controls_rwsem
);
775 list
.count
= card
->controls_count
;
776 up_read(&card
->controls_rwsem
);
778 if (copy_to_user(_list
, &list
, sizeof(list
)))
783 static int snd_ctl_elem_info(struct snd_ctl_file
*ctl
,
784 struct snd_ctl_elem_info
*info
)
786 struct snd_card
*card
= ctl
->card
;
787 struct snd_kcontrol
*kctl
;
788 struct snd_kcontrol_volatile
*vd
;
789 unsigned int index_offset
;
792 down_read(&card
->controls_rwsem
);
793 kctl
= snd_ctl_find_id(card
, &info
->id
);
795 up_read(&card
->controls_rwsem
);
798 #ifdef CONFIG_SND_DEBUG
801 result
= kctl
->info(kctl
, info
);
803 snd_BUG_ON(info
->access
);
804 index_offset
= snd_ctl_get_ioff(kctl
, &info
->id
);
805 vd
= &kctl
->vd
[index_offset
];
806 snd_ctl_build_ioff(&info
->id
, kctl
, index_offset
);
807 info
->access
= vd
->access
;
809 info
->access
|= SNDRV_CTL_ELEM_ACCESS_LOCK
;
810 if (vd
->owner
== ctl
)
811 info
->access
|= SNDRV_CTL_ELEM_ACCESS_OWNER
;
812 info
->owner
= pid_vnr(vd
->owner
->pid
);
817 up_read(&card
->controls_rwsem
);
821 static int snd_ctl_elem_info_user(struct snd_ctl_file
*ctl
,
822 struct snd_ctl_elem_info __user
*_info
)
824 struct snd_ctl_elem_info info
;
827 if (copy_from_user(&info
, _info
, sizeof(info
)))
829 snd_power_lock(ctl
->card
);
830 result
= snd_power_wait(ctl
->card
, SNDRV_CTL_POWER_D0
);
832 result
= snd_ctl_elem_info(ctl
, &info
);
833 snd_power_unlock(ctl
->card
);
835 if (copy_to_user(_info
, &info
, sizeof(info
)))
840 static int snd_ctl_elem_read(struct snd_card
*card
,
841 struct snd_ctl_elem_value
*control
)
843 struct snd_kcontrol
*kctl
;
844 struct snd_kcontrol_volatile
*vd
;
845 unsigned int index_offset
;
848 down_read(&card
->controls_rwsem
);
849 kctl
= snd_ctl_find_id(card
, &control
->id
);
853 index_offset
= snd_ctl_get_ioff(kctl
, &control
->id
);
854 vd
= &kctl
->vd
[index_offset
];
855 if ((vd
->access
& SNDRV_CTL_ELEM_ACCESS_READ
) &&
857 snd_ctl_build_ioff(&control
->id
, kctl
, index_offset
);
858 result
= kctl
->get(kctl
, control
);
862 up_read(&card
->controls_rwsem
);
866 static int snd_ctl_elem_read_user(struct snd_card
*card
,
867 struct snd_ctl_elem_value __user
*_control
)
869 struct snd_ctl_elem_value
*control
;
872 control
= memdup_user(_control
, sizeof(*control
));
874 return PTR_ERR(control
);
876 snd_power_lock(card
);
877 result
= snd_power_wait(card
, SNDRV_CTL_POWER_D0
);
879 result
= snd_ctl_elem_read(card
, control
);
880 snd_power_unlock(card
);
882 if (copy_to_user(_control
, control
, sizeof(*control
)))
888 static int snd_ctl_elem_write(struct snd_card
*card
, struct snd_ctl_file
*file
,
889 struct snd_ctl_elem_value
*control
)
891 struct snd_kcontrol
*kctl
;
892 struct snd_kcontrol_volatile
*vd
;
893 unsigned int index_offset
;
896 down_read(&card
->controls_rwsem
);
897 kctl
= snd_ctl_find_id(card
, &control
->id
);
901 index_offset
= snd_ctl_get_ioff(kctl
, &control
->id
);
902 vd
= &kctl
->vd
[index_offset
];
903 if (!(vd
->access
& SNDRV_CTL_ELEM_ACCESS_WRITE
) ||
905 (file
&& vd
->owner
&& vd
->owner
!= file
)) {
908 snd_ctl_build_ioff(&control
->id
, kctl
, index_offset
);
909 result
= kctl
->put(kctl
, control
);
912 struct snd_ctl_elem_id id
= control
->id
;
913 up_read(&card
->controls_rwsem
);
914 snd_ctl_notify(card
, SNDRV_CTL_EVENT_MASK_VALUE
, &id
);
918 up_read(&card
->controls_rwsem
);
922 static int snd_ctl_elem_write_user(struct snd_ctl_file
*file
,
923 struct snd_ctl_elem_value __user
*_control
)
925 struct snd_ctl_elem_value
*control
;
926 struct snd_card
*card
;
929 control
= memdup_user(_control
, sizeof(*control
));
931 return PTR_ERR(control
);
934 snd_power_lock(card
);
935 result
= snd_power_wait(card
, SNDRV_CTL_POWER_D0
);
937 result
= snd_ctl_elem_write(card
, file
, control
);
938 snd_power_unlock(card
);
940 if (copy_to_user(_control
, control
, sizeof(*control
)))
946 static int snd_ctl_elem_lock(struct snd_ctl_file
*file
,
947 struct snd_ctl_elem_id __user
*_id
)
949 struct snd_card
*card
= file
->card
;
950 struct snd_ctl_elem_id id
;
951 struct snd_kcontrol
*kctl
;
952 struct snd_kcontrol_volatile
*vd
;
955 if (copy_from_user(&id
, _id
, sizeof(id
)))
957 down_write(&card
->controls_rwsem
);
958 kctl
= snd_ctl_find_id(card
, &id
);
962 vd
= &kctl
->vd
[snd_ctl_get_ioff(kctl
, &id
)];
963 if (vd
->owner
!= NULL
)
970 up_write(&card
->controls_rwsem
);
974 static int snd_ctl_elem_unlock(struct snd_ctl_file
*file
,
975 struct snd_ctl_elem_id __user
*_id
)
977 struct snd_card
*card
= file
->card
;
978 struct snd_ctl_elem_id id
;
979 struct snd_kcontrol
*kctl
;
980 struct snd_kcontrol_volatile
*vd
;
983 if (copy_from_user(&id
, _id
, sizeof(id
)))
985 down_write(&card
->controls_rwsem
);
986 kctl
= snd_ctl_find_id(card
, &id
);
990 vd
= &kctl
->vd
[snd_ctl_get_ioff(kctl
, &id
)];
991 if (vd
->owner
== NULL
)
993 else if (vd
->owner
!= file
)
1000 up_write(&card
->controls_rwsem
);
1004 struct user_element
{
1005 struct snd_ctl_elem_info info
;
1006 struct snd_card
*card
;
1007 void *elem_data
; /* element data */
1008 unsigned long elem_data_size
; /* size of element data in bytes */
1009 void *tlv_data
; /* TLV data */
1010 unsigned long tlv_data_size
; /* TLV data size */
1011 void *priv_data
; /* private data (like strings for enumerated type) */
1014 static int snd_ctl_elem_user_info(struct snd_kcontrol
*kcontrol
,
1015 struct snd_ctl_elem_info
*uinfo
)
1017 struct user_element
*ue
= kcontrol
->private_data
;
1023 static int snd_ctl_elem_user_enum_info(struct snd_kcontrol
*kcontrol
,
1024 struct snd_ctl_elem_info
*uinfo
)
1026 struct user_element
*ue
= kcontrol
->private_data
;
1030 item
= uinfo
->value
.enumerated
.item
;
1034 item
= min(item
, uinfo
->value
.enumerated
.items
- 1);
1035 uinfo
->value
.enumerated
.item
= item
;
1037 names
= ue
->priv_data
;
1038 for (; item
> 0; --item
)
1039 names
+= strlen(names
) + 1;
1040 strcpy(uinfo
->value
.enumerated
.name
, names
);
1045 static int snd_ctl_elem_user_get(struct snd_kcontrol
*kcontrol
,
1046 struct snd_ctl_elem_value
*ucontrol
)
1048 struct user_element
*ue
= kcontrol
->private_data
;
1050 mutex_lock(&ue
->card
->user_ctl_lock
);
1051 memcpy(&ucontrol
->value
, ue
->elem_data
, ue
->elem_data_size
);
1052 mutex_unlock(&ue
->card
->user_ctl_lock
);
1056 static int snd_ctl_elem_user_put(struct snd_kcontrol
*kcontrol
,
1057 struct snd_ctl_elem_value
*ucontrol
)
1060 struct user_element
*ue
= kcontrol
->private_data
;
1062 mutex_lock(&ue
->card
->user_ctl_lock
);
1063 change
= memcmp(&ucontrol
->value
, ue
->elem_data
, ue
->elem_data_size
) != 0;
1065 memcpy(ue
->elem_data
, &ucontrol
->value
, ue
->elem_data_size
);
1066 mutex_unlock(&ue
->card
->user_ctl_lock
);
1070 static int snd_ctl_elem_user_tlv(struct snd_kcontrol
*kcontrol
,
1073 unsigned int __user
*tlv
)
1075 struct user_element
*ue
= kcontrol
->private_data
;
1080 if (size
> 1024 * 128) /* sane value */
1083 new_data
= memdup_user(tlv
, size
);
1084 if (IS_ERR(new_data
))
1085 return PTR_ERR(new_data
);
1086 mutex_lock(&ue
->card
->user_ctl_lock
);
1087 change
= ue
->tlv_data_size
!= size
;
1089 change
= memcmp(ue
->tlv_data
, new_data
, size
);
1090 kfree(ue
->tlv_data
);
1091 ue
->tlv_data
= new_data
;
1092 ue
->tlv_data_size
= size
;
1093 mutex_unlock(&ue
->card
->user_ctl_lock
);
1097 mutex_lock(&ue
->card
->user_ctl_lock
);
1098 if (!ue
->tlv_data_size
|| !ue
->tlv_data
) {
1102 if (size
< ue
->tlv_data_size
) {
1106 if (copy_to_user(tlv
, ue
->tlv_data
, ue
->tlv_data_size
))
1109 mutex_unlock(&ue
->card
->user_ctl_lock
);
1116 static int snd_ctl_elem_init_enum_names(struct user_element
*ue
)
1119 size_t buf_len
, name_len
;
1121 const uintptr_t user_ptrval
= ue
->info
.value
.enumerated
.names_ptr
;
1123 if (ue
->info
.value
.enumerated
.names_length
> 64 * 1024)
1126 names
= memdup_user((const void __user
*)user_ptrval
,
1127 ue
->info
.value
.enumerated
.names_length
);
1129 return PTR_ERR(names
);
1131 /* check that there are enough valid names */
1132 buf_len
= ue
->info
.value
.enumerated
.names_length
;
1134 for (i
= 0; i
< ue
->info
.value
.enumerated
.items
; ++i
) {
1135 name_len
= strnlen(p
, buf_len
);
1136 if (name_len
== 0 || name_len
>= 64 || name_len
== buf_len
) {
1141 buf_len
-= name_len
+ 1;
1144 ue
->priv_data
= names
;
1145 ue
->info
.value
.enumerated
.names_ptr
= 0;
1150 static void snd_ctl_elem_user_free(struct snd_kcontrol
*kcontrol
)
1152 struct user_element
*ue
= kcontrol
->private_data
;
1154 kfree(ue
->tlv_data
);
1155 kfree(ue
->priv_data
);
1159 static int snd_ctl_elem_add(struct snd_ctl_file
*file
,
1160 struct snd_ctl_elem_info
*info
, int replace
)
1162 struct snd_card
*card
= file
->card
;
1163 struct snd_kcontrol kctl
, *_kctl
;
1164 unsigned int access
;
1166 struct user_element
*ue
;
1169 if (info
->count
< 1)
1171 if (!*info
->id
.name
)
1173 if (strnlen(info
->id
.name
, sizeof(info
->id
.name
)) >= sizeof(info
->id
.name
))
1175 access
= info
->access
== 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE
:
1176 (info
->access
& (SNDRV_CTL_ELEM_ACCESS_READWRITE
|
1177 SNDRV_CTL_ELEM_ACCESS_INACTIVE
|
1178 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE
));
1180 memset(&kctl
, 0, sizeof(kctl
));
1183 err
= snd_ctl_remove_user_ctl(file
, &info
->id
);
1188 if (card
->user_ctl_count
>= MAX_USER_CONTROLS
)
1191 memcpy(&kctl
.id
, &info
->id
, sizeof(info
->id
));
1192 kctl
.count
= info
->owner
? info
->owner
: 1;
1193 access
|= SNDRV_CTL_ELEM_ACCESS_USER
;
1194 if (info
->type
== SNDRV_CTL_ELEM_TYPE_ENUMERATED
)
1195 kctl
.info
= snd_ctl_elem_user_enum_info
;
1197 kctl
.info
= snd_ctl_elem_user_info
;
1198 if (access
& SNDRV_CTL_ELEM_ACCESS_READ
)
1199 kctl
.get
= snd_ctl_elem_user_get
;
1200 if (access
& SNDRV_CTL_ELEM_ACCESS_WRITE
)
1201 kctl
.put
= snd_ctl_elem_user_put
;
1202 if (access
& SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE
) {
1203 kctl
.tlv
.c
= snd_ctl_elem_user_tlv
;
1204 access
|= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK
;
1206 switch (info
->type
) {
1207 case SNDRV_CTL_ELEM_TYPE_BOOLEAN
:
1208 case SNDRV_CTL_ELEM_TYPE_INTEGER
:
1209 private_size
= sizeof(long);
1210 if (info
->count
> 128)
1213 case SNDRV_CTL_ELEM_TYPE_INTEGER64
:
1214 private_size
= sizeof(long long);
1215 if (info
->count
> 64)
1218 case SNDRV_CTL_ELEM_TYPE_ENUMERATED
:
1219 private_size
= sizeof(unsigned int);
1220 if (info
->count
> 128 || info
->value
.enumerated
.items
== 0)
1223 case SNDRV_CTL_ELEM_TYPE_BYTES
:
1224 private_size
= sizeof(unsigned char);
1225 if (info
->count
> 512)
1228 case SNDRV_CTL_ELEM_TYPE_IEC958
:
1229 private_size
= sizeof(struct snd_aes_iec958
);
1230 if (info
->count
!= 1)
1236 private_size
*= info
->count
;
1237 ue
= kzalloc(sizeof(struct user_element
) + private_size
, GFP_KERNEL
);
1242 ue
->info
.access
= 0;
1243 ue
->elem_data
= (char *)ue
+ sizeof(*ue
);
1244 ue
->elem_data_size
= private_size
;
1245 if (ue
->info
.type
== SNDRV_CTL_ELEM_TYPE_ENUMERATED
) {
1246 err
= snd_ctl_elem_init_enum_names(ue
);
1252 kctl
.private_free
= snd_ctl_elem_user_free
;
1253 _kctl
= snd_ctl_new(&kctl
, access
);
1254 if (_kctl
== NULL
) {
1255 kfree(ue
->priv_data
);
1259 _kctl
->private_data
= ue
;
1260 for (idx
= 0; idx
< _kctl
->count
; idx
++)
1261 _kctl
->vd
[idx
].owner
= file
;
1262 err
= snd_ctl_add(card
, _kctl
);
1266 down_write(&card
->controls_rwsem
);
1267 card
->user_ctl_count
++;
1268 up_write(&card
->controls_rwsem
);
1273 static int snd_ctl_elem_add_user(struct snd_ctl_file
*file
,
1274 struct snd_ctl_elem_info __user
*_info
, int replace
)
1276 struct snd_ctl_elem_info info
;
1277 if (copy_from_user(&info
, _info
, sizeof(info
)))
1279 return snd_ctl_elem_add(file
, &info
, replace
);
1282 static int snd_ctl_elem_remove(struct snd_ctl_file
*file
,
1283 struct snd_ctl_elem_id __user
*_id
)
1285 struct snd_ctl_elem_id id
;
1287 if (copy_from_user(&id
, _id
, sizeof(id
)))
1289 return snd_ctl_remove_user_ctl(file
, &id
);
1292 static int snd_ctl_subscribe_events(struct snd_ctl_file
*file
, int __user
*ptr
)
1295 if (get_user(subscribe
, ptr
))
1297 if (subscribe
< 0) {
1298 subscribe
= file
->subscribed
;
1299 if (put_user(subscribe
, ptr
))
1304 file
->subscribed
= 1;
1306 } else if (file
->subscribed
) {
1307 snd_ctl_empty_read_queue(file
);
1308 file
->subscribed
= 0;
1313 static int snd_ctl_tlv_ioctl(struct snd_ctl_file
*file
,
1314 struct snd_ctl_tlv __user
*_tlv
,
1317 struct snd_card
*card
= file
->card
;
1318 struct snd_ctl_tlv tlv
;
1319 struct snd_kcontrol
*kctl
;
1320 struct snd_kcontrol_volatile
*vd
;
1324 if (copy_from_user(&tlv
, _tlv
, sizeof(tlv
)))
1326 if (tlv
.length
< sizeof(unsigned int) * 2)
1328 down_read(&card
->controls_rwsem
);
1329 kctl
= snd_ctl_find_numid(card
, tlv
.numid
);
1334 if (kctl
->tlv
.p
== NULL
) {
1338 vd
= &kctl
->vd
[tlv
.numid
- kctl
->id
.numid
];
1339 if ((op_flag
== 0 && (vd
->access
& SNDRV_CTL_ELEM_ACCESS_TLV_READ
) == 0) ||
1340 (op_flag
> 0 && (vd
->access
& SNDRV_CTL_ELEM_ACCESS_TLV_WRITE
) == 0) ||
1341 (op_flag
< 0 && (vd
->access
& SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND
) == 0)) {
1345 if (vd
->access
& SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK
) {
1346 if (vd
->owner
!= NULL
&& vd
->owner
!= file
) {
1350 err
= kctl
->tlv
.c(kctl
, op_flag
, tlv
.length
, _tlv
->tlv
);
1352 struct snd_ctl_elem_id id
= kctl
->id
;
1353 up_read(&card
->controls_rwsem
);
1354 snd_ctl_notify(card
, SNDRV_CTL_EVENT_MASK_TLV
, &id
);
1362 len
= kctl
->tlv
.p
[1] + 2 * sizeof(unsigned int);
1363 if (tlv
.length
< len
) {
1367 if (copy_to_user(_tlv
->tlv
, kctl
->tlv
.p
, len
))
1371 up_read(&card
->controls_rwsem
);
1375 static long snd_ctl_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1377 struct snd_ctl_file
*ctl
;
1378 struct snd_card
*card
;
1379 struct snd_kctl_ioctl
*p
;
1380 void __user
*argp
= (void __user
*)arg
;
1381 int __user
*ip
= argp
;
1384 ctl
= file
->private_data
;
1386 if (snd_BUG_ON(!card
))
1389 case SNDRV_CTL_IOCTL_PVERSION
:
1390 return put_user(SNDRV_CTL_VERSION
, ip
) ? -EFAULT
: 0;
1391 case SNDRV_CTL_IOCTL_CARD_INFO
:
1392 return snd_ctl_card_info(card
, ctl
, cmd
, argp
);
1393 case SNDRV_CTL_IOCTL_ELEM_LIST
:
1394 return snd_ctl_elem_list(card
, argp
);
1395 case SNDRV_CTL_IOCTL_ELEM_INFO
:
1396 return snd_ctl_elem_info_user(ctl
, argp
);
1397 case SNDRV_CTL_IOCTL_ELEM_READ
:
1398 return snd_ctl_elem_read_user(card
, argp
);
1399 case SNDRV_CTL_IOCTL_ELEM_WRITE
:
1400 return snd_ctl_elem_write_user(ctl
, argp
);
1401 case SNDRV_CTL_IOCTL_ELEM_LOCK
:
1402 return snd_ctl_elem_lock(ctl
, argp
);
1403 case SNDRV_CTL_IOCTL_ELEM_UNLOCK
:
1404 return snd_ctl_elem_unlock(ctl
, argp
);
1405 case SNDRV_CTL_IOCTL_ELEM_ADD
:
1406 return snd_ctl_elem_add_user(ctl
, argp
, 0);
1407 case SNDRV_CTL_IOCTL_ELEM_REPLACE
:
1408 return snd_ctl_elem_add_user(ctl
, argp
, 1);
1409 case SNDRV_CTL_IOCTL_ELEM_REMOVE
:
1410 return snd_ctl_elem_remove(ctl
, argp
);
1411 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS
:
1412 return snd_ctl_subscribe_events(ctl
, ip
);
1413 case SNDRV_CTL_IOCTL_TLV_READ
:
1414 return snd_ctl_tlv_ioctl(ctl
, argp
, 0);
1415 case SNDRV_CTL_IOCTL_TLV_WRITE
:
1416 return snd_ctl_tlv_ioctl(ctl
, argp
, 1);
1417 case SNDRV_CTL_IOCTL_TLV_COMMAND
:
1418 return snd_ctl_tlv_ioctl(ctl
, argp
, -1);
1419 case SNDRV_CTL_IOCTL_POWER
:
1420 return -ENOPROTOOPT
;
1421 case SNDRV_CTL_IOCTL_POWER_STATE
:
1423 return put_user(card
->power_state
, ip
) ? -EFAULT
: 0;
1425 return put_user(SNDRV_CTL_POWER_D0
, ip
) ? -EFAULT
: 0;
1428 down_read(&snd_ioctl_rwsem
);
1429 list_for_each_entry(p
, &snd_control_ioctls
, list
) {
1430 err
= p
->fioctl(card
, ctl
, cmd
, arg
);
1431 if (err
!= -ENOIOCTLCMD
) {
1432 up_read(&snd_ioctl_rwsem
);
1436 up_read(&snd_ioctl_rwsem
);
1437 snd_printdd("unknown ioctl = 0x%x\n", cmd
);
1441 static ssize_t
snd_ctl_read(struct file
*file
, char __user
*buffer
,
1442 size_t count
, loff_t
* offset
)
1444 struct snd_ctl_file
*ctl
;
1448 ctl
= file
->private_data
;
1449 if (snd_BUG_ON(!ctl
|| !ctl
->card
))
1451 if (!ctl
->subscribed
)
1453 if (count
< sizeof(struct snd_ctl_event
))
1455 spin_lock_irq(&ctl
->read_lock
);
1456 while (count
>= sizeof(struct snd_ctl_event
)) {
1457 struct snd_ctl_event ev
;
1458 struct snd_kctl_event
*kev
;
1459 while (list_empty(&ctl
->events
)) {
1461 if ((file
->f_flags
& O_NONBLOCK
) != 0 || result
> 0) {
1465 init_waitqueue_entry(&wait
, current
);
1466 add_wait_queue(&ctl
->change_sleep
, &wait
);
1467 set_current_state(TASK_INTERRUPTIBLE
);
1468 spin_unlock_irq(&ctl
->read_lock
);
1470 remove_wait_queue(&ctl
->change_sleep
, &wait
);
1471 if (ctl
->card
->shutdown
)
1473 if (signal_pending(current
))
1474 return -ERESTARTSYS
;
1475 spin_lock_irq(&ctl
->read_lock
);
1477 kev
= snd_kctl_event(ctl
->events
.next
);
1478 ev
.type
= SNDRV_CTL_EVENT_ELEM
;
1479 ev
.data
.elem
.mask
= kev
->mask
;
1480 ev
.data
.elem
.id
= kev
->id
;
1481 list_del(&kev
->list
);
1482 spin_unlock_irq(&ctl
->read_lock
);
1484 if (copy_to_user(buffer
, &ev
, sizeof(struct snd_ctl_event
))) {
1488 spin_lock_irq(&ctl
->read_lock
);
1489 buffer
+= sizeof(struct snd_ctl_event
);
1490 count
-= sizeof(struct snd_ctl_event
);
1491 result
+= sizeof(struct snd_ctl_event
);
1494 spin_unlock_irq(&ctl
->read_lock
);
1496 return result
> 0 ? result
: err
;
1499 static unsigned int snd_ctl_poll(struct file
*file
, poll_table
* wait
)
1502 struct snd_ctl_file
*ctl
;
1504 ctl
= file
->private_data
;
1505 if (!ctl
->subscribed
)
1507 poll_wait(file
, &ctl
->change_sleep
, wait
);
1510 if (!list_empty(&ctl
->events
))
1511 mask
|= POLLIN
| POLLRDNORM
;
1517 * register the device-specific control-ioctls.
1518 * called from each device manager like pcm.c, hwdep.c, etc.
1520 static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn
, struct list_head
*lists
)
1522 struct snd_kctl_ioctl
*pn
;
1524 pn
= kzalloc(sizeof(struct snd_kctl_ioctl
), GFP_KERNEL
);
1528 down_write(&snd_ioctl_rwsem
);
1529 list_add_tail(&pn
->list
, lists
);
1530 up_write(&snd_ioctl_rwsem
);
1534 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn
)
1536 return _snd_ctl_register_ioctl(fcn
, &snd_control_ioctls
);
1539 EXPORT_SYMBOL(snd_ctl_register_ioctl
);
1541 #ifdef CONFIG_COMPAT
1542 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn
)
1544 return _snd_ctl_register_ioctl(fcn
, &snd_control_compat_ioctls
);
1547 EXPORT_SYMBOL(snd_ctl_register_ioctl_compat
);
1551 * de-register the device-specific control-ioctls.
1553 static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn
,
1554 struct list_head
*lists
)
1556 struct snd_kctl_ioctl
*p
;
1558 if (snd_BUG_ON(!fcn
))
1560 down_write(&snd_ioctl_rwsem
);
1561 list_for_each_entry(p
, lists
, list
) {
1562 if (p
->fioctl
== fcn
) {
1564 up_write(&snd_ioctl_rwsem
);
1569 up_write(&snd_ioctl_rwsem
);
1574 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn
)
1576 return _snd_ctl_unregister_ioctl(fcn
, &snd_control_ioctls
);
1579 EXPORT_SYMBOL(snd_ctl_unregister_ioctl
);
1581 #ifdef CONFIG_COMPAT
1582 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn
)
1584 return _snd_ctl_unregister_ioctl(fcn
, &snd_control_compat_ioctls
);
1587 EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat
);
1590 static int snd_ctl_fasync(int fd
, struct file
* file
, int on
)
1592 struct snd_ctl_file
*ctl
;
1594 ctl
= file
->private_data
;
1595 return fasync_helper(fd
, file
, on
, &ctl
->fasync
);
1601 #ifdef CONFIG_COMPAT
1602 #include "control_compat.c"
1604 #define snd_ctl_ioctl_compat NULL
1611 static const struct file_operations snd_ctl_f_ops
=
1613 .owner
= THIS_MODULE
,
1614 .read
= snd_ctl_read
,
1615 .open
= snd_ctl_open
,
1616 .release
= snd_ctl_release
,
1617 .llseek
= no_llseek
,
1618 .poll
= snd_ctl_poll
,
1619 .unlocked_ioctl
= snd_ctl_ioctl
,
1620 .compat_ioctl
= snd_ctl_ioctl_compat
,
1621 .fasync
= snd_ctl_fasync
,
1625 * registration of the control device
1627 static int snd_ctl_dev_register(struct snd_device
*device
)
1629 struct snd_card
*card
= device
->device_data
;
1633 if (snd_BUG_ON(!card
))
1635 cardnum
= card
->number
;
1636 if (snd_BUG_ON(cardnum
< 0 || cardnum
>= SNDRV_CARDS
))
1638 sprintf(name
, "controlC%i", cardnum
);
1639 if ((err
= snd_register_device(SNDRV_DEVICE_TYPE_CONTROL
, card
, -1,
1640 &snd_ctl_f_ops
, card
, name
)) < 0)
1646 * disconnection of the control device
1648 static int snd_ctl_dev_disconnect(struct snd_device
*device
)
1650 struct snd_card
*card
= device
->device_data
;
1651 struct snd_ctl_file
*ctl
;
1654 if (snd_BUG_ON(!card
))
1656 cardnum
= card
->number
;
1657 if (snd_BUG_ON(cardnum
< 0 || cardnum
>= SNDRV_CARDS
))
1660 read_lock(&card
->ctl_files_rwlock
);
1661 list_for_each_entry(ctl
, &card
->ctl_files
, list
) {
1662 wake_up(&ctl
->change_sleep
);
1663 kill_fasync(&ctl
->fasync
, SIGIO
, POLL_ERR
);
1665 read_unlock(&card
->ctl_files_rwlock
);
1667 if ((err
= snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL
,
1676 static int snd_ctl_dev_free(struct snd_device
*device
)
1678 struct snd_card
*card
= device
->device_data
;
1679 struct snd_kcontrol
*control
;
1681 down_write(&card
->controls_rwsem
);
1682 while (!list_empty(&card
->controls
)) {
1683 control
= snd_kcontrol(card
->controls
.next
);
1684 snd_ctl_remove(card
, control
);
1686 up_write(&card
->controls_rwsem
);
1691 * create control core:
1692 * called from init.c
1694 int snd_ctl_create(struct snd_card
*card
)
1696 static struct snd_device_ops ops
= {
1697 .dev_free
= snd_ctl_dev_free
,
1698 .dev_register
= snd_ctl_dev_register
,
1699 .dev_disconnect
= snd_ctl_dev_disconnect
,
1702 if (snd_BUG_ON(!card
))
1704 return snd_device_new(card
, SNDRV_DEV_CONTROL
, card
, &ops
);
1708 * Frequently used control callbacks/helpers
1710 int snd_ctl_boolean_mono_info(struct snd_kcontrol
*kcontrol
,
1711 struct snd_ctl_elem_info
*uinfo
)
1713 uinfo
->type
= SNDRV_CTL_ELEM_TYPE_BOOLEAN
;
1715 uinfo
->value
.integer
.min
= 0;
1716 uinfo
->value
.integer
.max
= 1;
1720 EXPORT_SYMBOL(snd_ctl_boolean_mono_info
);
1722 int snd_ctl_boolean_stereo_info(struct snd_kcontrol
*kcontrol
,
1723 struct snd_ctl_elem_info
*uinfo
)
1725 uinfo
->type
= SNDRV_CTL_ELEM_TYPE_BOOLEAN
;
1727 uinfo
->value
.integer
.min
= 0;
1728 uinfo
->value
.integer
.max
= 1;
1732 EXPORT_SYMBOL(snd_ctl_boolean_stereo_info
);
1735 * snd_ctl_enum_info - fills the info structure for an enumerated control
1736 * @info: the structure to be filled
1737 * @channels: the number of the control's channels; often one
1738 * @items: the number of control values; also the size of @names
1739 * @names: an array containing the names of all control values
1741 * Sets all required fields in @info to their appropriate values.
1742 * If the control's accessibility is not the default (readable and writable),
1743 * the caller has to fill @info->access.
1747 int snd_ctl_enum_info(struct snd_ctl_elem_info
*info
, unsigned int channels
,
1748 unsigned int items
, const char *const names
[])
1750 info
->type
= SNDRV_CTL_ELEM_TYPE_ENUMERATED
;
1751 info
->count
= channels
;
1752 info
->value
.enumerated
.items
= items
;
1753 if (info
->value
.enumerated
.item
>= items
)
1754 info
->value
.enumerated
.item
= items
- 1;
1755 strlcpy(info
->value
.enumerated
.name
,
1756 names
[info
->value
.enumerated
.item
],
1757 sizeof(info
->value
.enumerated
.name
));
1760 EXPORT_SYMBOL(snd_ctl_enum_info
);