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
);
92 module_put(card
->module
);
94 snd_card_file_remove(card
, file
);
99 static void snd_ctl_empty_read_queue(struct snd_ctl_file
* ctl
)
102 struct snd_kctl_event
*cread
;
104 spin_lock_irqsave(&ctl
->read_lock
, flags
);
105 while (!list_empty(&ctl
->events
)) {
106 cread
= snd_kctl_event(ctl
->events
.next
);
107 list_del(&cread
->list
);
110 spin_unlock_irqrestore(&ctl
->read_lock
, flags
);
113 static int snd_ctl_release(struct inode
*inode
, struct file
*file
)
116 struct snd_card
*card
;
117 struct snd_ctl_file
*ctl
;
118 struct snd_kcontrol
*control
;
121 ctl
= file
->private_data
;
122 file
->private_data
= NULL
;
124 write_lock_irqsave(&card
->ctl_files_rwlock
, flags
);
125 list_del(&ctl
->list
);
126 write_unlock_irqrestore(&card
->ctl_files_rwlock
, flags
);
127 down_write(&card
->controls_rwsem
);
128 list_for_each_entry(control
, &card
->controls
, list
)
129 for (idx
= 0; idx
< control
->count
; idx
++)
130 if (control
->vd
[idx
].owner
== ctl
)
131 control
->vd
[idx
].owner
= NULL
;
132 up_write(&card
->controls_rwsem
);
133 snd_ctl_empty_read_queue(ctl
);
136 module_put(card
->module
);
137 snd_card_file_remove(card
, file
);
141 void snd_ctl_notify(struct snd_card
*card
, unsigned int mask
,
142 struct snd_ctl_elem_id
*id
)
145 struct snd_ctl_file
*ctl
;
146 struct snd_kctl_event
*ev
;
148 if (snd_BUG_ON(!card
|| !id
))
150 read_lock(&card
->ctl_files_rwlock
);
151 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
152 card
->mixer_oss_change_count
++;
154 list_for_each_entry(ctl
, &card
->ctl_files
, list
) {
155 if (!ctl
->subscribed
)
157 spin_lock_irqsave(&ctl
->read_lock
, flags
);
158 list_for_each_entry(ev
, &ctl
->events
, list
) {
159 if (ev
->id
.numid
== id
->numid
) {
164 ev
= kzalloc(sizeof(*ev
), GFP_ATOMIC
);
168 list_add_tail(&ev
->list
, &ctl
->events
);
170 snd_printk(KERN_ERR
"No memory available to allocate event\n");
173 wake_up(&ctl
->change_sleep
);
174 spin_unlock_irqrestore(&ctl
->read_lock
, flags
);
175 kill_fasync(&ctl
->fasync
, SIGIO
, POLL_IN
);
177 read_unlock(&card
->ctl_files_rwlock
);
180 EXPORT_SYMBOL(snd_ctl_notify
);
183 * snd_ctl_new - create a control instance from the template
184 * @control: the control template
185 * @access: the default control access
187 * Allocates a new struct snd_kcontrol instance and copies the given template
188 * to the new instance. It does not copy volatile data (access).
190 * Returns the pointer of the new instance, or NULL on failure.
192 static struct snd_kcontrol
*snd_ctl_new(struct snd_kcontrol
*control
,
195 struct snd_kcontrol
*kctl
;
198 if (snd_BUG_ON(!control
|| !control
->count
))
201 if (control
->count
> MAX_CONTROL_COUNT
)
204 kctl
= kzalloc(sizeof(*kctl
) + sizeof(struct snd_kcontrol_volatile
) * control
->count
, GFP_KERNEL
);
206 snd_printk(KERN_ERR
"Cannot allocate control instance\n");
210 for (idx
= 0; idx
< kctl
->count
; idx
++)
211 kctl
->vd
[idx
].access
= access
;
216 * snd_ctl_new1 - create a control instance from the template
217 * @ncontrol: the initialization record
218 * @private_data: the private data to set
220 * Allocates a new struct snd_kcontrol instance and initialize from the given
221 * template. When the access field of ncontrol is 0, it's assumed as
222 * READWRITE access. When the count field is 0, it's assumes as one.
224 * Returns the pointer of the newly generated instance, or NULL on failure.
226 struct snd_kcontrol
*snd_ctl_new1(const struct snd_kcontrol_new
*ncontrol
,
229 struct snd_kcontrol kctl
;
232 if (snd_BUG_ON(!ncontrol
|| !ncontrol
->info
))
234 memset(&kctl
, 0, sizeof(kctl
));
235 kctl
.id
.iface
= ncontrol
->iface
;
236 kctl
.id
.device
= ncontrol
->device
;
237 kctl
.id
.subdevice
= ncontrol
->subdevice
;
238 if (ncontrol
->name
) {
239 strlcpy(kctl
.id
.name
, ncontrol
->name
, sizeof(kctl
.id
.name
));
240 if (strcmp(ncontrol
->name
, kctl
.id
.name
) != 0)
241 snd_printk(KERN_WARNING
242 "Control name '%s' truncated to '%s'\n",
243 ncontrol
->name
, kctl
.id
.name
);
245 kctl
.id
.index
= ncontrol
->index
;
246 kctl
.count
= ncontrol
->count
? ncontrol
->count
: 1;
247 access
= ncontrol
->access
== 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE
:
248 (ncontrol
->access
& (SNDRV_CTL_ELEM_ACCESS_READWRITE
|
249 SNDRV_CTL_ELEM_ACCESS_VOLATILE
|
250 SNDRV_CTL_ELEM_ACCESS_INACTIVE
|
251 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE
|
252 SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND
|
253 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK
));
254 kctl
.info
= ncontrol
->info
;
255 kctl
.get
= ncontrol
->get
;
256 kctl
.put
= ncontrol
->put
;
257 kctl
.tlv
.p
= ncontrol
->tlv
.p
;
258 kctl
.private_value
= ncontrol
->private_value
;
259 kctl
.private_data
= private_data
;
260 return snd_ctl_new(&kctl
, access
);
263 EXPORT_SYMBOL(snd_ctl_new1
);
266 * snd_ctl_free_one - release the control instance
267 * @kcontrol: the control instance
269 * Releases the control instance created via snd_ctl_new()
271 * Don't call this after the control was added to the card.
273 void snd_ctl_free_one(struct snd_kcontrol
*kcontrol
)
276 if (kcontrol
->private_free
)
277 kcontrol
->private_free(kcontrol
);
282 EXPORT_SYMBOL(snd_ctl_free_one
);
284 static bool snd_ctl_remove_numid_conflict(struct snd_card
*card
,
287 struct snd_kcontrol
*kctl
;
289 list_for_each_entry(kctl
, &card
->controls
, list
) {
290 if (kctl
->id
.numid
< card
->last_numid
+ 1 + count
&&
291 kctl
->id
.numid
+ kctl
->count
> card
->last_numid
+ 1) {
292 card
->last_numid
= kctl
->id
.numid
+ kctl
->count
- 1;
299 static int snd_ctl_find_hole(struct snd_card
*card
, unsigned int count
)
301 unsigned int iter
= 100000;
303 while (snd_ctl_remove_numid_conflict(card
, count
)) {
305 /* this situation is very unlikely */
306 snd_printk(KERN_ERR
"unable to allocate new control numid\n");
314 * snd_ctl_add - add the control instance to the card
315 * @card: the card instance
316 * @kcontrol: the control instance to add
318 * Adds the control instance created via snd_ctl_new() or
319 * snd_ctl_new1() to the given card. Assigns also an unique
320 * numid used for fast search.
322 * Returns zero if successful, or a negative error code on failure.
324 * It frees automatically the control which cannot be added.
326 int snd_ctl_add(struct snd_card
*card
, struct snd_kcontrol
*kcontrol
)
328 struct snd_ctl_elem_id id
;
334 if (snd_BUG_ON(!card
|| !kcontrol
->info
))
337 down_write(&card
->controls_rwsem
);
338 if (snd_ctl_find_id(card
, &id
)) {
339 up_write(&card
->controls_rwsem
);
340 snd_printd(KERN_ERR
"control %i:%i:%i:%s:%i is already present\n",
349 if (snd_ctl_find_hole(card
, kcontrol
->count
) < 0) {
350 up_write(&card
->controls_rwsem
);
354 list_add_tail(&kcontrol
->list
, &card
->controls
);
355 card
->controls_count
+= kcontrol
->count
;
356 kcontrol
->id
.numid
= card
->last_numid
+ 1;
357 card
->last_numid
+= kcontrol
->count
;
358 up_write(&card
->controls_rwsem
);
359 for (idx
= 0; idx
< kcontrol
->count
; idx
++, id
.index
++, id
.numid
++)
360 snd_ctl_notify(card
, SNDRV_CTL_EVENT_MASK_ADD
, &id
);
364 snd_ctl_free_one(kcontrol
);
368 EXPORT_SYMBOL(snd_ctl_add
);
371 * snd_ctl_replace - replace the control instance of the card
372 * @card: the card instance
373 * @kcontrol: the control instance to replace
374 * @add_on_replace: add the control if not already added
376 * Replaces the given control. If the given control does not exist
377 * and the add_on_replace flag is set, the control is added. If the
378 * control exists, it is destroyed first.
380 * Returns zero if successful, or a negative error code on failure.
382 * It frees automatically the control which cannot be added or replaced.
384 int snd_ctl_replace(struct snd_card
*card
, struct snd_kcontrol
*kcontrol
,
387 struct snd_ctl_elem_id id
;
389 struct snd_kcontrol
*old
;
394 if (snd_BUG_ON(!card
|| !kcontrol
->info
)) {
399 down_write(&card
->controls_rwsem
);
400 old
= snd_ctl_find_id(card
, &id
);
404 up_write(&card
->controls_rwsem
);
408 ret
= snd_ctl_remove(card
, old
);
410 up_write(&card
->controls_rwsem
);
414 if (snd_ctl_find_hole(card
, kcontrol
->count
) < 0) {
415 up_write(&card
->controls_rwsem
);
419 list_add_tail(&kcontrol
->list
, &card
->controls
);
420 card
->controls_count
+= kcontrol
->count
;
421 kcontrol
->id
.numid
= card
->last_numid
+ 1;
422 card
->last_numid
+= kcontrol
->count
;
423 up_write(&card
->controls_rwsem
);
424 for (idx
= 0; idx
< kcontrol
->count
; idx
++, id
.index
++, id
.numid
++)
425 snd_ctl_notify(card
, SNDRV_CTL_EVENT_MASK_ADD
, &id
);
429 snd_ctl_free_one(kcontrol
);
432 EXPORT_SYMBOL(snd_ctl_replace
);
435 * snd_ctl_remove - remove the control from the card and release it
436 * @card: the card instance
437 * @kcontrol: the control instance to remove
439 * Removes the control from the card and then releases the instance.
440 * You don't need to call snd_ctl_free_one(). You must be in
441 * the write lock - down_write(&card->controls_rwsem).
443 * Returns 0 if successful, or a negative error code on failure.
445 int snd_ctl_remove(struct snd_card
*card
, struct snd_kcontrol
*kcontrol
)
447 struct snd_ctl_elem_id id
;
450 if (snd_BUG_ON(!card
|| !kcontrol
))
452 list_del(&kcontrol
->list
);
453 card
->controls_count
-= kcontrol
->count
;
455 for (idx
= 0; idx
< kcontrol
->count
; idx
++, id
.index
++, id
.numid
++)
456 snd_ctl_notify(card
, SNDRV_CTL_EVENT_MASK_REMOVE
, &id
);
457 snd_ctl_free_one(kcontrol
);
461 EXPORT_SYMBOL(snd_ctl_remove
);
464 * snd_ctl_remove_id - remove the control of the given id and release it
465 * @card: the card instance
466 * @id: the control id to remove
468 * Finds the control instance with the given id, removes it from the
469 * card list and releases it.
471 * Returns 0 if successful, or a negative error code on failure.
473 int snd_ctl_remove_id(struct snd_card
*card
, struct snd_ctl_elem_id
*id
)
475 struct snd_kcontrol
*kctl
;
478 down_write(&card
->controls_rwsem
);
479 kctl
= snd_ctl_find_id(card
, id
);
481 up_write(&card
->controls_rwsem
);
484 ret
= snd_ctl_remove(card
, kctl
);
485 up_write(&card
->controls_rwsem
);
489 EXPORT_SYMBOL(snd_ctl_remove_id
);
492 * snd_ctl_remove_user_ctl - remove and release the unlocked user control
493 * @file: active control handle
494 * @id: the control id to remove
496 * Finds the control instance with the given id, removes it from the
497 * card list and releases it.
499 * Returns 0 if successful, or a negative error code on failure.
501 static int snd_ctl_remove_user_ctl(struct snd_ctl_file
* file
,
502 struct snd_ctl_elem_id
*id
)
504 struct snd_card
*card
= file
->card
;
505 struct snd_kcontrol
*kctl
;
508 down_write(&card
->controls_rwsem
);
509 kctl
= snd_ctl_find_id(card
, id
);
514 if (!(kctl
->vd
[0].access
& SNDRV_CTL_ELEM_ACCESS_USER
)) {
518 for (idx
= 0; idx
< kctl
->count
; idx
++)
519 if (kctl
->vd
[idx
].owner
!= NULL
&& kctl
->vd
[idx
].owner
!= file
) {
523 ret
= snd_ctl_remove(card
, kctl
);
526 card
->user_ctl_count
--;
528 up_write(&card
->controls_rwsem
);
533 * snd_ctl_activate_id - activate/inactivate the control of the given id
534 * @card: the card instance
535 * @id: the control id to activate/inactivate
536 * @active: non-zero to activate
538 * Finds the control instance with the given id, and activate or
539 * inactivate the control together with notification, if changed.
541 * Returns 0 if unchanged, 1 if changed, or a negative error code on failure.
543 int snd_ctl_activate_id(struct snd_card
*card
, struct snd_ctl_elem_id
*id
,
546 struct snd_kcontrol
*kctl
;
547 struct snd_kcontrol_volatile
*vd
;
548 unsigned int index_offset
;
551 down_write(&card
->controls_rwsem
);
552 kctl
= snd_ctl_find_id(card
, id
);
557 index_offset
= snd_ctl_get_ioff(kctl
, &kctl
->id
);
558 vd
= &kctl
->vd
[index_offset
];
561 if (!(vd
->access
& SNDRV_CTL_ELEM_ACCESS_INACTIVE
))
563 vd
->access
&= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE
;
565 if (vd
->access
& SNDRV_CTL_ELEM_ACCESS_INACTIVE
)
567 vd
->access
|= SNDRV_CTL_ELEM_ACCESS_INACTIVE
;
571 up_write(&card
->controls_rwsem
);
573 snd_ctl_notify(card
, SNDRV_CTL_EVENT_MASK_INFO
, id
);
576 EXPORT_SYMBOL_GPL(snd_ctl_activate_id
);
579 * snd_ctl_rename_id - replace the id of a control on the card
580 * @card: the card instance
581 * @src_id: the old id
582 * @dst_id: the new id
584 * Finds the control with the old id from the card, and replaces the
585 * id with the new one.
587 * Returns zero if successful, or a negative error code on failure.
589 int snd_ctl_rename_id(struct snd_card
*card
, struct snd_ctl_elem_id
*src_id
,
590 struct snd_ctl_elem_id
*dst_id
)
592 struct snd_kcontrol
*kctl
;
594 down_write(&card
->controls_rwsem
);
595 kctl
= snd_ctl_find_id(card
, src_id
);
597 up_write(&card
->controls_rwsem
);
601 kctl
->id
.numid
= card
->last_numid
+ 1;
602 card
->last_numid
+= kctl
->count
;
603 up_write(&card
->controls_rwsem
);
607 EXPORT_SYMBOL(snd_ctl_rename_id
);
610 * snd_ctl_find_numid - find the control instance with the given number-id
611 * @card: the card instance
612 * @numid: the number-id to search
614 * Finds the control instance with the given number-id from the card.
616 * Returns the pointer of the instance if found, or NULL if not.
618 * The caller must down card->controls_rwsem before calling this function
619 * (if the race condition can happen).
621 struct snd_kcontrol
*snd_ctl_find_numid(struct snd_card
*card
, unsigned int numid
)
623 struct snd_kcontrol
*kctl
;
625 if (snd_BUG_ON(!card
|| !numid
))
627 list_for_each_entry(kctl
, &card
->controls
, list
) {
628 if (kctl
->id
.numid
<= numid
&& kctl
->id
.numid
+ kctl
->count
> numid
)
634 EXPORT_SYMBOL(snd_ctl_find_numid
);
637 * snd_ctl_find_id - find the control instance with the given id
638 * @card: the card instance
639 * @id: the id to search
641 * Finds the control instance with the given id from the card.
643 * Returns the pointer of the instance if found, or NULL if not.
645 * The caller must down card->controls_rwsem before calling this function
646 * (if the race condition can happen).
648 struct snd_kcontrol
*snd_ctl_find_id(struct snd_card
*card
,
649 struct snd_ctl_elem_id
*id
)
651 struct snd_kcontrol
*kctl
;
653 if (snd_BUG_ON(!card
|| !id
))
656 return snd_ctl_find_numid(card
, id
->numid
);
657 list_for_each_entry(kctl
, &card
->controls
, list
) {
658 if (kctl
->id
.iface
!= id
->iface
)
660 if (kctl
->id
.device
!= id
->device
)
662 if (kctl
->id
.subdevice
!= id
->subdevice
)
664 if (strncmp(kctl
->id
.name
, id
->name
, sizeof(kctl
->id
.name
)))
666 if (kctl
->id
.index
> id
->index
)
668 if (kctl
->id
.index
+ kctl
->count
<= id
->index
)
675 EXPORT_SYMBOL(snd_ctl_find_id
);
677 static int snd_ctl_card_info(struct snd_card
*card
, struct snd_ctl_file
* ctl
,
678 unsigned int cmd
, void __user
*arg
)
680 struct snd_ctl_card_info
*info
;
682 info
= kzalloc(sizeof(*info
), GFP_KERNEL
);
685 down_read(&snd_ioctl_rwsem
);
686 info
->card
= card
->number
;
687 strlcpy(info
->id
, card
->id
, sizeof(info
->id
));
688 strlcpy(info
->driver
, card
->driver
, sizeof(info
->driver
));
689 strlcpy(info
->name
, card
->shortname
, sizeof(info
->name
));
690 strlcpy(info
->longname
, card
->longname
, sizeof(info
->longname
));
691 strlcpy(info
->mixername
, card
->mixername
, sizeof(info
->mixername
));
692 strlcpy(info
->components
, card
->components
, sizeof(info
->components
));
693 up_read(&snd_ioctl_rwsem
);
694 if (copy_to_user(arg
, info
, sizeof(struct snd_ctl_card_info
))) {
702 static int snd_ctl_elem_list(struct snd_card
*card
,
703 struct snd_ctl_elem_list __user
*_list
)
705 struct list_head
*plist
;
706 struct snd_ctl_elem_list list
;
707 struct snd_kcontrol
*kctl
;
708 struct snd_ctl_elem_id
*dst
, *id
;
709 unsigned int offset
, space
, jidx
;
711 if (copy_from_user(&list
, _list
, sizeof(list
)))
713 offset
= list
.offset
;
715 /* try limit maximum space */
719 /* allocate temporary buffer for atomic operation */
720 dst
= vmalloc(space
* sizeof(struct snd_ctl_elem_id
));
723 down_read(&card
->controls_rwsem
);
724 list
.count
= card
->controls_count
;
725 plist
= card
->controls
.next
;
726 while (plist
!= &card
->controls
) {
729 kctl
= snd_kcontrol(plist
);
730 if (offset
< kctl
->count
)
732 offset
-= kctl
->count
;
737 while (space
> 0 && plist
!= &card
->controls
) {
738 kctl
= snd_kcontrol(plist
);
739 for (jidx
= offset
; space
> 0 && jidx
< kctl
->count
; jidx
++) {
740 snd_ctl_build_ioff(id
, kctl
, jidx
);
748 up_read(&card
->controls_rwsem
);
750 copy_to_user(list
.pids
, dst
,
751 list
.used
* sizeof(struct snd_ctl_elem_id
))) {
757 down_read(&card
->controls_rwsem
);
758 list
.count
= card
->controls_count
;
759 up_read(&card
->controls_rwsem
);
761 if (copy_to_user(_list
, &list
, sizeof(list
)))
766 static int snd_ctl_elem_info(struct snd_ctl_file
*ctl
,
767 struct snd_ctl_elem_info
*info
)
769 struct snd_card
*card
= ctl
->card
;
770 struct snd_kcontrol
*kctl
;
771 struct snd_kcontrol_volatile
*vd
;
772 unsigned int index_offset
;
775 down_read(&card
->controls_rwsem
);
776 kctl
= snd_ctl_find_id(card
, &info
->id
);
778 up_read(&card
->controls_rwsem
);
781 #ifdef CONFIG_SND_DEBUG
784 result
= kctl
->info(kctl
, info
);
786 snd_BUG_ON(info
->access
);
787 index_offset
= snd_ctl_get_ioff(kctl
, &info
->id
);
788 vd
= &kctl
->vd
[index_offset
];
789 snd_ctl_build_ioff(&info
->id
, kctl
, index_offset
);
790 info
->access
= vd
->access
;
792 info
->access
|= SNDRV_CTL_ELEM_ACCESS_LOCK
;
793 if (vd
->owner
== ctl
)
794 info
->access
|= SNDRV_CTL_ELEM_ACCESS_OWNER
;
795 info
->owner
= pid_vnr(vd
->owner
->pid
);
800 up_read(&card
->controls_rwsem
);
804 static int snd_ctl_elem_info_user(struct snd_ctl_file
*ctl
,
805 struct snd_ctl_elem_info __user
*_info
)
807 struct snd_ctl_elem_info info
;
810 if (copy_from_user(&info
, _info
, sizeof(info
)))
812 snd_power_lock(ctl
->card
);
813 result
= snd_power_wait(ctl
->card
, SNDRV_CTL_POWER_D0
);
815 result
= snd_ctl_elem_info(ctl
, &info
);
816 snd_power_unlock(ctl
->card
);
818 if (copy_to_user(_info
, &info
, sizeof(info
)))
823 static int snd_ctl_elem_read(struct snd_card
*card
,
824 struct snd_ctl_elem_value
*control
)
826 struct snd_kcontrol
*kctl
;
827 struct snd_kcontrol_volatile
*vd
;
828 unsigned int index_offset
;
831 down_read(&card
->controls_rwsem
);
832 kctl
= snd_ctl_find_id(card
, &control
->id
);
836 index_offset
= snd_ctl_get_ioff(kctl
, &control
->id
);
837 vd
= &kctl
->vd
[index_offset
];
838 if ((vd
->access
& SNDRV_CTL_ELEM_ACCESS_READ
) &&
840 snd_ctl_build_ioff(&control
->id
, kctl
, index_offset
);
841 result
= kctl
->get(kctl
, control
);
845 up_read(&card
->controls_rwsem
);
849 static int snd_ctl_elem_read_user(struct snd_card
*card
,
850 struct snd_ctl_elem_value __user
*_control
)
852 struct snd_ctl_elem_value
*control
;
855 control
= memdup_user(_control
, sizeof(*control
));
857 return PTR_ERR(control
);
859 snd_power_lock(card
);
860 result
= snd_power_wait(card
, SNDRV_CTL_POWER_D0
);
862 result
= snd_ctl_elem_read(card
, control
);
863 snd_power_unlock(card
);
865 if (copy_to_user(_control
, control
, sizeof(*control
)))
871 static int snd_ctl_elem_write(struct snd_card
*card
, struct snd_ctl_file
*file
,
872 struct snd_ctl_elem_value
*control
)
874 struct snd_kcontrol
*kctl
;
875 struct snd_kcontrol_volatile
*vd
;
876 unsigned int index_offset
;
879 down_read(&card
->controls_rwsem
);
880 kctl
= snd_ctl_find_id(card
, &control
->id
);
884 index_offset
= snd_ctl_get_ioff(kctl
, &control
->id
);
885 vd
= &kctl
->vd
[index_offset
];
886 if (!(vd
->access
& SNDRV_CTL_ELEM_ACCESS_WRITE
) ||
888 (file
&& vd
->owner
&& vd
->owner
!= file
)) {
891 snd_ctl_build_ioff(&control
->id
, kctl
, index_offset
);
892 result
= kctl
->put(kctl
, control
);
895 up_read(&card
->controls_rwsem
);
896 snd_ctl_notify(card
, SNDRV_CTL_EVENT_MASK_VALUE
,
901 up_read(&card
->controls_rwsem
);
905 static int snd_ctl_elem_write_user(struct snd_ctl_file
*file
,
906 struct snd_ctl_elem_value __user
*_control
)
908 struct snd_ctl_elem_value
*control
;
909 struct snd_card
*card
;
912 control
= memdup_user(_control
, sizeof(*control
));
914 return PTR_ERR(control
);
917 snd_power_lock(card
);
918 result
= snd_power_wait(card
, SNDRV_CTL_POWER_D0
);
920 result
= snd_ctl_elem_write(card
, file
, control
);
921 snd_power_unlock(card
);
923 if (copy_to_user(_control
, control
, sizeof(*control
)))
929 static int snd_ctl_elem_lock(struct snd_ctl_file
*file
,
930 struct snd_ctl_elem_id __user
*_id
)
932 struct snd_card
*card
= file
->card
;
933 struct snd_ctl_elem_id id
;
934 struct snd_kcontrol
*kctl
;
935 struct snd_kcontrol_volatile
*vd
;
938 if (copy_from_user(&id
, _id
, sizeof(id
)))
940 down_write(&card
->controls_rwsem
);
941 kctl
= snd_ctl_find_id(card
, &id
);
945 vd
= &kctl
->vd
[snd_ctl_get_ioff(kctl
, &id
)];
946 if (vd
->owner
!= NULL
)
953 up_write(&card
->controls_rwsem
);
957 static int snd_ctl_elem_unlock(struct snd_ctl_file
*file
,
958 struct snd_ctl_elem_id __user
*_id
)
960 struct snd_card
*card
= file
->card
;
961 struct snd_ctl_elem_id id
;
962 struct snd_kcontrol
*kctl
;
963 struct snd_kcontrol_volatile
*vd
;
966 if (copy_from_user(&id
, _id
, sizeof(id
)))
968 down_write(&card
->controls_rwsem
);
969 kctl
= snd_ctl_find_id(card
, &id
);
973 vd
= &kctl
->vd
[snd_ctl_get_ioff(kctl
, &id
)];
974 if (vd
->owner
== NULL
)
976 else if (vd
->owner
!= file
)
983 up_write(&card
->controls_rwsem
);
987 struct user_element
{
988 struct snd_ctl_elem_info info
;
989 void *elem_data
; /* element data */
990 unsigned long elem_data_size
; /* size of element data in bytes */
991 void *tlv_data
; /* TLV data */
992 unsigned long tlv_data_size
; /* TLV data size */
993 void *priv_data
; /* private data (like strings for enumerated type) */
996 static int snd_ctl_elem_user_info(struct snd_kcontrol
*kcontrol
,
997 struct snd_ctl_elem_info
*uinfo
)
999 struct user_element
*ue
= kcontrol
->private_data
;
1005 static int snd_ctl_elem_user_enum_info(struct snd_kcontrol
*kcontrol
,
1006 struct snd_ctl_elem_info
*uinfo
)
1008 struct user_element
*ue
= kcontrol
->private_data
;
1012 item
= uinfo
->value
.enumerated
.item
;
1016 item
= min(item
, uinfo
->value
.enumerated
.items
- 1);
1017 uinfo
->value
.enumerated
.item
= item
;
1019 names
= ue
->priv_data
;
1020 for (; item
> 0; --item
)
1021 names
+= strlen(names
) + 1;
1022 strcpy(uinfo
->value
.enumerated
.name
, names
);
1027 static int snd_ctl_elem_user_get(struct snd_kcontrol
*kcontrol
,
1028 struct snd_ctl_elem_value
*ucontrol
)
1030 struct user_element
*ue
= kcontrol
->private_data
;
1032 memcpy(&ucontrol
->value
, ue
->elem_data
, ue
->elem_data_size
);
1036 static int snd_ctl_elem_user_put(struct snd_kcontrol
*kcontrol
,
1037 struct snd_ctl_elem_value
*ucontrol
)
1040 struct user_element
*ue
= kcontrol
->private_data
;
1042 change
= memcmp(&ucontrol
->value
, ue
->elem_data
, ue
->elem_data_size
) != 0;
1044 memcpy(ue
->elem_data
, &ucontrol
->value
, ue
->elem_data_size
);
1048 static int snd_ctl_elem_user_tlv(struct snd_kcontrol
*kcontrol
,
1051 unsigned int __user
*tlv
)
1053 struct user_element
*ue
= kcontrol
->private_data
;
1058 if (size
> 1024 * 128) /* sane value */
1061 new_data
= memdup_user(tlv
, size
);
1062 if (IS_ERR(new_data
))
1063 return PTR_ERR(new_data
);
1064 change
= ue
->tlv_data_size
!= size
;
1066 change
= memcmp(ue
->tlv_data
, new_data
, size
);
1067 kfree(ue
->tlv_data
);
1068 ue
->tlv_data
= new_data
;
1069 ue
->tlv_data_size
= size
;
1071 if (! ue
->tlv_data_size
|| ! ue
->tlv_data
)
1073 if (size
< ue
->tlv_data_size
)
1075 if (copy_to_user(tlv
, ue
->tlv_data
, ue
->tlv_data_size
))
1081 static int snd_ctl_elem_init_enum_names(struct user_element
*ue
)
1084 size_t buf_len
, name_len
;
1086 const uintptr_t user_ptrval
= ue
->info
.value
.enumerated
.names_ptr
;
1088 if (ue
->info
.value
.enumerated
.names_length
> 64 * 1024)
1091 names
= memdup_user((const void __user
*)user_ptrval
,
1092 ue
->info
.value
.enumerated
.names_length
);
1094 return PTR_ERR(names
);
1096 /* check that there are enough valid names */
1097 buf_len
= ue
->info
.value
.enumerated
.names_length
;
1099 for (i
= 0; i
< ue
->info
.value
.enumerated
.items
; ++i
) {
1100 name_len
= strnlen(p
, buf_len
);
1101 if (name_len
== 0 || name_len
>= 64 || name_len
== buf_len
) {
1106 buf_len
-= name_len
+ 1;
1109 ue
->priv_data
= names
;
1110 ue
->info
.value
.enumerated
.names_ptr
= 0;
1115 static void snd_ctl_elem_user_free(struct snd_kcontrol
*kcontrol
)
1117 struct user_element
*ue
= kcontrol
->private_data
;
1119 kfree(ue
->tlv_data
);
1120 kfree(ue
->priv_data
);
1124 static int snd_ctl_elem_add(struct snd_ctl_file
*file
,
1125 struct snd_ctl_elem_info
*info
, int replace
)
1127 struct snd_card
*card
= file
->card
;
1128 struct snd_kcontrol kctl
, *_kctl
;
1129 unsigned int access
;
1131 struct user_element
*ue
;
1134 if (!replace
&& card
->user_ctl_count
>= MAX_USER_CONTROLS
)
1136 if (info
->count
< 1)
1138 access
= info
->access
== 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE
:
1139 (info
->access
& (SNDRV_CTL_ELEM_ACCESS_READWRITE
|
1140 SNDRV_CTL_ELEM_ACCESS_INACTIVE
|
1141 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE
));
1143 memset(&kctl
, 0, sizeof(kctl
));
1144 down_write(&card
->controls_rwsem
);
1145 _kctl
= snd_ctl_find_id(card
, &info
->id
);
1149 err
= snd_ctl_remove(card
, _kctl
);
1156 up_write(&card
->controls_rwsem
);
1159 memcpy(&kctl
.id
, &info
->id
, sizeof(info
->id
));
1160 kctl
.count
= info
->owner
? info
->owner
: 1;
1161 access
|= SNDRV_CTL_ELEM_ACCESS_USER
;
1162 if (info
->type
== SNDRV_CTL_ELEM_TYPE_ENUMERATED
)
1163 kctl
.info
= snd_ctl_elem_user_enum_info
;
1165 kctl
.info
= snd_ctl_elem_user_info
;
1166 if (access
& SNDRV_CTL_ELEM_ACCESS_READ
)
1167 kctl
.get
= snd_ctl_elem_user_get
;
1168 if (access
& SNDRV_CTL_ELEM_ACCESS_WRITE
)
1169 kctl
.put
= snd_ctl_elem_user_put
;
1170 if (access
& SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE
) {
1171 kctl
.tlv
.c
= snd_ctl_elem_user_tlv
;
1172 access
|= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK
;
1174 switch (info
->type
) {
1175 case SNDRV_CTL_ELEM_TYPE_BOOLEAN
:
1176 case SNDRV_CTL_ELEM_TYPE_INTEGER
:
1177 private_size
= sizeof(long);
1178 if (info
->count
> 128)
1181 case SNDRV_CTL_ELEM_TYPE_INTEGER64
:
1182 private_size
= sizeof(long long);
1183 if (info
->count
> 64)
1186 case SNDRV_CTL_ELEM_TYPE_ENUMERATED
:
1187 private_size
= sizeof(unsigned int);
1188 if (info
->count
> 128 || info
->value
.enumerated
.items
== 0)
1191 case SNDRV_CTL_ELEM_TYPE_BYTES
:
1192 private_size
= sizeof(unsigned char);
1193 if (info
->count
> 512)
1196 case SNDRV_CTL_ELEM_TYPE_IEC958
:
1197 private_size
= sizeof(struct snd_aes_iec958
);
1198 if (info
->count
!= 1)
1204 private_size
*= info
->count
;
1205 ue
= kzalloc(sizeof(struct user_element
) + private_size
, GFP_KERNEL
);
1209 ue
->info
.access
= 0;
1210 ue
->elem_data
= (char *)ue
+ sizeof(*ue
);
1211 ue
->elem_data_size
= private_size
;
1212 if (ue
->info
.type
== SNDRV_CTL_ELEM_TYPE_ENUMERATED
) {
1213 err
= snd_ctl_elem_init_enum_names(ue
);
1219 kctl
.private_free
= snd_ctl_elem_user_free
;
1220 _kctl
= snd_ctl_new(&kctl
, access
);
1221 if (_kctl
== NULL
) {
1222 kfree(ue
->priv_data
);
1226 _kctl
->private_data
= ue
;
1227 for (idx
= 0; idx
< _kctl
->count
; idx
++)
1228 _kctl
->vd
[idx
].owner
= file
;
1229 err
= snd_ctl_add(card
, _kctl
);
1233 down_write(&card
->controls_rwsem
);
1234 card
->user_ctl_count
++;
1235 up_write(&card
->controls_rwsem
);
1240 static int snd_ctl_elem_add_user(struct snd_ctl_file
*file
,
1241 struct snd_ctl_elem_info __user
*_info
, int replace
)
1243 struct snd_ctl_elem_info info
;
1244 if (copy_from_user(&info
, _info
, sizeof(info
)))
1246 return snd_ctl_elem_add(file
, &info
, replace
);
1249 static int snd_ctl_elem_remove(struct snd_ctl_file
*file
,
1250 struct snd_ctl_elem_id __user
*_id
)
1252 struct snd_ctl_elem_id id
;
1254 if (copy_from_user(&id
, _id
, sizeof(id
)))
1256 return snd_ctl_remove_user_ctl(file
, &id
);
1259 static int snd_ctl_subscribe_events(struct snd_ctl_file
*file
, int __user
*ptr
)
1262 if (get_user(subscribe
, ptr
))
1264 if (subscribe
< 0) {
1265 subscribe
= file
->subscribed
;
1266 if (put_user(subscribe
, ptr
))
1271 file
->subscribed
= 1;
1273 } else if (file
->subscribed
) {
1274 snd_ctl_empty_read_queue(file
);
1275 file
->subscribed
= 0;
1280 static int snd_ctl_tlv_ioctl(struct snd_ctl_file
*file
,
1281 struct snd_ctl_tlv __user
*_tlv
,
1284 struct snd_card
*card
= file
->card
;
1285 struct snd_ctl_tlv tlv
;
1286 struct snd_kcontrol
*kctl
;
1287 struct snd_kcontrol_volatile
*vd
;
1291 if (copy_from_user(&tlv
, _tlv
, sizeof(tlv
)))
1293 if (tlv
.length
< sizeof(unsigned int) * 2)
1295 down_read(&card
->controls_rwsem
);
1296 kctl
= snd_ctl_find_numid(card
, tlv
.numid
);
1301 if (kctl
->tlv
.p
== NULL
) {
1305 vd
= &kctl
->vd
[tlv
.numid
- kctl
->id
.numid
];
1306 if ((op_flag
== 0 && (vd
->access
& SNDRV_CTL_ELEM_ACCESS_TLV_READ
) == 0) ||
1307 (op_flag
> 0 && (vd
->access
& SNDRV_CTL_ELEM_ACCESS_TLV_WRITE
) == 0) ||
1308 (op_flag
< 0 && (vd
->access
& SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND
) == 0)) {
1312 if (vd
->access
& SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK
) {
1313 if (vd
->owner
!= NULL
&& vd
->owner
!= file
) {
1317 err
= kctl
->tlv
.c(kctl
, op_flag
, tlv
.length
, _tlv
->tlv
);
1319 up_read(&card
->controls_rwsem
);
1320 snd_ctl_notify(card
, SNDRV_CTL_EVENT_MASK_TLV
, &kctl
->id
);
1328 len
= kctl
->tlv
.p
[1] + 2 * sizeof(unsigned int);
1329 if (tlv
.length
< len
) {
1333 if (copy_to_user(_tlv
->tlv
, kctl
->tlv
.p
, len
))
1337 up_read(&card
->controls_rwsem
);
1341 static long snd_ctl_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1343 struct snd_ctl_file
*ctl
;
1344 struct snd_card
*card
;
1345 struct snd_kctl_ioctl
*p
;
1346 void __user
*argp
= (void __user
*)arg
;
1347 int __user
*ip
= argp
;
1350 ctl
= file
->private_data
;
1352 if (snd_BUG_ON(!card
))
1355 case SNDRV_CTL_IOCTL_PVERSION
:
1356 return put_user(SNDRV_CTL_VERSION
, ip
) ? -EFAULT
: 0;
1357 case SNDRV_CTL_IOCTL_CARD_INFO
:
1358 return snd_ctl_card_info(card
, ctl
, cmd
, argp
);
1359 case SNDRV_CTL_IOCTL_ELEM_LIST
:
1360 return snd_ctl_elem_list(card
, argp
);
1361 case SNDRV_CTL_IOCTL_ELEM_INFO
:
1362 return snd_ctl_elem_info_user(ctl
, argp
);
1363 case SNDRV_CTL_IOCTL_ELEM_READ
:
1364 return snd_ctl_elem_read_user(card
, argp
);
1365 case SNDRV_CTL_IOCTL_ELEM_WRITE
:
1366 return snd_ctl_elem_write_user(ctl
, argp
);
1367 case SNDRV_CTL_IOCTL_ELEM_LOCK
:
1368 return snd_ctl_elem_lock(ctl
, argp
);
1369 case SNDRV_CTL_IOCTL_ELEM_UNLOCK
:
1370 return snd_ctl_elem_unlock(ctl
, argp
);
1371 case SNDRV_CTL_IOCTL_ELEM_ADD
:
1372 return snd_ctl_elem_add_user(ctl
, argp
, 0);
1373 case SNDRV_CTL_IOCTL_ELEM_REPLACE
:
1374 return snd_ctl_elem_add_user(ctl
, argp
, 1);
1375 case SNDRV_CTL_IOCTL_ELEM_REMOVE
:
1376 return snd_ctl_elem_remove(ctl
, argp
);
1377 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS
:
1378 return snd_ctl_subscribe_events(ctl
, ip
);
1379 case SNDRV_CTL_IOCTL_TLV_READ
:
1380 return snd_ctl_tlv_ioctl(ctl
, argp
, 0);
1381 case SNDRV_CTL_IOCTL_TLV_WRITE
:
1382 return snd_ctl_tlv_ioctl(ctl
, argp
, 1);
1383 case SNDRV_CTL_IOCTL_TLV_COMMAND
:
1384 return snd_ctl_tlv_ioctl(ctl
, argp
, -1);
1385 case SNDRV_CTL_IOCTL_POWER
:
1386 return -ENOPROTOOPT
;
1387 case SNDRV_CTL_IOCTL_POWER_STATE
:
1389 return put_user(card
->power_state
, ip
) ? -EFAULT
: 0;
1391 return put_user(SNDRV_CTL_POWER_D0
, ip
) ? -EFAULT
: 0;
1394 down_read(&snd_ioctl_rwsem
);
1395 list_for_each_entry(p
, &snd_control_ioctls
, list
) {
1396 err
= p
->fioctl(card
, ctl
, cmd
, arg
);
1397 if (err
!= -ENOIOCTLCMD
) {
1398 up_read(&snd_ioctl_rwsem
);
1402 up_read(&snd_ioctl_rwsem
);
1403 snd_printdd("unknown ioctl = 0x%x\n", cmd
);
1407 static ssize_t
snd_ctl_read(struct file
*file
, char __user
*buffer
,
1408 size_t count
, loff_t
* offset
)
1410 struct snd_ctl_file
*ctl
;
1414 ctl
= file
->private_data
;
1415 if (snd_BUG_ON(!ctl
|| !ctl
->card
))
1417 if (!ctl
->subscribed
)
1419 if (count
< sizeof(struct snd_ctl_event
))
1421 spin_lock_irq(&ctl
->read_lock
);
1422 while (count
>= sizeof(struct snd_ctl_event
)) {
1423 struct snd_ctl_event ev
;
1424 struct snd_kctl_event
*kev
;
1425 while (list_empty(&ctl
->events
)) {
1427 if ((file
->f_flags
& O_NONBLOCK
) != 0 || result
> 0) {
1431 init_waitqueue_entry(&wait
, current
);
1432 add_wait_queue(&ctl
->change_sleep
, &wait
);
1433 set_current_state(TASK_INTERRUPTIBLE
);
1434 spin_unlock_irq(&ctl
->read_lock
);
1436 remove_wait_queue(&ctl
->change_sleep
, &wait
);
1437 if (signal_pending(current
))
1438 return -ERESTARTSYS
;
1439 spin_lock_irq(&ctl
->read_lock
);
1441 kev
= snd_kctl_event(ctl
->events
.next
);
1442 ev
.type
= SNDRV_CTL_EVENT_ELEM
;
1443 ev
.data
.elem
.mask
= kev
->mask
;
1444 ev
.data
.elem
.id
= kev
->id
;
1445 list_del(&kev
->list
);
1446 spin_unlock_irq(&ctl
->read_lock
);
1448 if (copy_to_user(buffer
, &ev
, sizeof(struct snd_ctl_event
))) {
1452 spin_lock_irq(&ctl
->read_lock
);
1453 buffer
+= sizeof(struct snd_ctl_event
);
1454 count
-= sizeof(struct snd_ctl_event
);
1455 result
+= sizeof(struct snd_ctl_event
);
1458 spin_unlock_irq(&ctl
->read_lock
);
1460 return result
> 0 ? result
: err
;
1463 static unsigned int snd_ctl_poll(struct file
*file
, poll_table
* wait
)
1466 struct snd_ctl_file
*ctl
;
1468 ctl
= file
->private_data
;
1469 if (!ctl
->subscribed
)
1471 poll_wait(file
, &ctl
->change_sleep
, wait
);
1474 if (!list_empty(&ctl
->events
))
1475 mask
|= POLLIN
| POLLRDNORM
;
1481 * register the device-specific control-ioctls.
1482 * called from each device manager like pcm.c, hwdep.c, etc.
1484 static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn
, struct list_head
*lists
)
1486 struct snd_kctl_ioctl
*pn
;
1488 pn
= kzalloc(sizeof(struct snd_kctl_ioctl
), GFP_KERNEL
);
1492 down_write(&snd_ioctl_rwsem
);
1493 list_add_tail(&pn
->list
, lists
);
1494 up_write(&snd_ioctl_rwsem
);
1498 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn
)
1500 return _snd_ctl_register_ioctl(fcn
, &snd_control_ioctls
);
1503 EXPORT_SYMBOL(snd_ctl_register_ioctl
);
1505 #ifdef CONFIG_COMPAT
1506 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn
)
1508 return _snd_ctl_register_ioctl(fcn
, &snd_control_compat_ioctls
);
1511 EXPORT_SYMBOL(snd_ctl_register_ioctl_compat
);
1515 * de-register the device-specific control-ioctls.
1517 static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn
,
1518 struct list_head
*lists
)
1520 struct snd_kctl_ioctl
*p
;
1522 if (snd_BUG_ON(!fcn
))
1524 down_write(&snd_ioctl_rwsem
);
1525 list_for_each_entry(p
, lists
, list
) {
1526 if (p
->fioctl
== fcn
) {
1528 up_write(&snd_ioctl_rwsem
);
1533 up_write(&snd_ioctl_rwsem
);
1538 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn
)
1540 return _snd_ctl_unregister_ioctl(fcn
, &snd_control_ioctls
);
1543 EXPORT_SYMBOL(snd_ctl_unregister_ioctl
);
1545 #ifdef CONFIG_COMPAT
1546 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn
)
1548 return _snd_ctl_unregister_ioctl(fcn
, &snd_control_compat_ioctls
);
1551 EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat
);
1554 static int snd_ctl_fasync(int fd
, struct file
* file
, int on
)
1556 struct snd_ctl_file
*ctl
;
1558 ctl
= file
->private_data
;
1559 return fasync_helper(fd
, file
, on
, &ctl
->fasync
);
1565 #ifdef CONFIG_COMPAT
1566 #include "control_compat.c"
1568 #define snd_ctl_ioctl_compat NULL
1575 static const struct file_operations snd_ctl_f_ops
=
1577 .owner
= THIS_MODULE
,
1578 .read
= snd_ctl_read
,
1579 .open
= snd_ctl_open
,
1580 .release
= snd_ctl_release
,
1581 .llseek
= no_llseek
,
1582 .poll
= snd_ctl_poll
,
1583 .unlocked_ioctl
= snd_ctl_ioctl
,
1584 .compat_ioctl
= snd_ctl_ioctl_compat
,
1585 .fasync
= snd_ctl_fasync
,
1589 * registration of the control device
1591 static int snd_ctl_dev_register(struct snd_device
*device
)
1593 struct snd_card
*card
= device
->device_data
;
1597 if (snd_BUG_ON(!card
))
1599 cardnum
= card
->number
;
1600 if (snd_BUG_ON(cardnum
< 0 || cardnum
>= SNDRV_CARDS
))
1602 sprintf(name
, "controlC%i", cardnum
);
1603 if ((err
= snd_register_device(SNDRV_DEVICE_TYPE_CONTROL
, card
, -1,
1604 &snd_ctl_f_ops
, card
, name
)) < 0)
1610 * disconnection of the control device
1612 static int snd_ctl_dev_disconnect(struct snd_device
*device
)
1614 struct snd_card
*card
= device
->device_data
;
1615 struct snd_ctl_file
*ctl
;
1618 if (snd_BUG_ON(!card
))
1620 cardnum
= card
->number
;
1621 if (snd_BUG_ON(cardnum
< 0 || cardnum
>= SNDRV_CARDS
))
1624 read_lock(&card
->ctl_files_rwlock
);
1625 list_for_each_entry(ctl
, &card
->ctl_files
, list
) {
1626 wake_up(&ctl
->change_sleep
);
1627 kill_fasync(&ctl
->fasync
, SIGIO
, POLL_ERR
);
1629 read_unlock(&card
->ctl_files_rwlock
);
1631 if ((err
= snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL
,
1640 static int snd_ctl_dev_free(struct snd_device
*device
)
1642 struct snd_card
*card
= device
->device_data
;
1643 struct snd_kcontrol
*control
;
1645 down_write(&card
->controls_rwsem
);
1646 while (!list_empty(&card
->controls
)) {
1647 control
= snd_kcontrol(card
->controls
.next
);
1648 snd_ctl_remove(card
, control
);
1650 up_write(&card
->controls_rwsem
);
1655 * create control core:
1656 * called from init.c
1658 int snd_ctl_create(struct snd_card
*card
)
1660 static struct snd_device_ops ops
= {
1661 .dev_free
= snd_ctl_dev_free
,
1662 .dev_register
= snd_ctl_dev_register
,
1663 .dev_disconnect
= snd_ctl_dev_disconnect
,
1666 if (snd_BUG_ON(!card
))
1668 return snd_device_new(card
, SNDRV_DEV_CONTROL
, card
, &ops
);
1672 * Frequently used control callbacks/helpers
1674 int snd_ctl_boolean_mono_info(struct snd_kcontrol
*kcontrol
,
1675 struct snd_ctl_elem_info
*uinfo
)
1677 uinfo
->type
= SNDRV_CTL_ELEM_TYPE_BOOLEAN
;
1679 uinfo
->value
.integer
.min
= 0;
1680 uinfo
->value
.integer
.max
= 1;
1684 EXPORT_SYMBOL(snd_ctl_boolean_mono_info
);
1686 int snd_ctl_boolean_stereo_info(struct snd_kcontrol
*kcontrol
,
1687 struct snd_ctl_elem_info
*uinfo
)
1689 uinfo
->type
= SNDRV_CTL_ELEM_TYPE_BOOLEAN
;
1691 uinfo
->value
.integer
.min
= 0;
1692 uinfo
->value
.integer
.max
= 1;
1696 EXPORT_SYMBOL(snd_ctl_boolean_stereo_info
);
1699 * snd_ctl_enum_info - fills the info structure for an enumerated control
1700 * @info: the structure to be filled
1701 * @channels: the number of the control's channels; often one
1702 * @items: the number of control values; also the size of @names
1703 * @names: an array containing the names of all control values
1705 * Sets all required fields in @info to their appropriate values.
1706 * If the control's accessibility is not the default (readable and writable),
1707 * the caller has to fill @info->access.
1709 int snd_ctl_enum_info(struct snd_ctl_elem_info
*info
, unsigned int channels
,
1710 unsigned int items
, const char *const names
[])
1712 info
->type
= SNDRV_CTL_ELEM_TYPE_ENUMERATED
;
1713 info
->count
= channels
;
1714 info
->value
.enumerated
.items
= items
;
1715 if (info
->value
.enumerated
.item
>= items
)
1716 info
->value
.enumerated
.item
= items
- 1;
1717 strlcpy(info
->value
.enumerated
.name
,
1718 names
[info
->value
.enumerated
.item
],
1719 sizeof(info
->value
.enumerated
.name
));
1722 EXPORT_SYMBOL(snd_ctl_enum_info
);