2 * Initialization routines
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/init.h>
23 #include <linux/sched.h>
24 #include <linux/file.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/ctype.h>
30 #include <sound/core.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
34 static DEFINE_SPINLOCK(shutdown_lock
);
35 static LIST_HEAD(shutdown_files
);
37 static const struct file_operations snd_shutdown_f_ops
;
39 static unsigned int snd_cards_lock
; /* locked for registering/using */
40 struct snd_card
*snd_cards
[SNDRV_CARDS
];
41 EXPORT_SYMBOL(snd_cards
);
43 static DEFINE_MUTEX(snd_card_mutex
);
45 static char *slots
[SNDRV_CARDS
];
46 module_param_array(slots
, charp
, NULL
, 0444);
47 MODULE_PARM_DESC(slots
, "Module names assigned to the slots.");
49 /* return non-zero if the given index is reserved for the given
50 * module via slots option
52 static int module_slot_match(struct module
*module
, int idx
)
58 if (!module
|| !module
->name
|| !slots
[idx
])
64 match
= 0; /* negative match */
67 /* compare module name strings
68 * hyphens are handled as equivalent with underscore
86 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
87 int (*snd_mixer_oss_notify_callback
)(struct snd_card
*card
, int free_flag
);
88 EXPORT_SYMBOL(snd_mixer_oss_notify_callback
);
92 static void snd_card_id_read(struct snd_info_entry
*entry
,
93 struct snd_info_buffer
*buffer
)
95 snd_iprintf(buffer
, "%s\n", entry
->card
->id
);
98 static inline int init_info_for_card(struct snd_card
*card
)
101 struct snd_info_entry
*entry
;
103 if ((err
= snd_info_card_register(card
)) < 0) {
104 snd_printd("unable to create card info\n");
107 if ((entry
= snd_info_create_card_entry(card
, "id", card
->proc_root
)) == NULL
) {
108 snd_printd("unable to create card entry\n");
111 entry
->c
.text
.read
= snd_card_id_read
;
112 if (snd_info_register(entry
) < 0) {
113 snd_info_free_entry(entry
);
116 card
->proc_id
= entry
;
119 #else /* !CONFIG_PROC_FS */
120 #define init_info_for_card(card)
124 * snd_card_create - create and initialize a soundcard structure
125 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
126 * @xid: card identification (ASCII string)
127 * @module: top level module for locking
128 * @extra_size: allocate this extra size after the main soundcard structure
129 * @card_ret: the pointer to store the created card instance
131 * Creates and initializes a soundcard structure.
133 * The function allocates snd_card instance via kzalloc with the given
134 * space for the driver to use freely. The allocated struct is stored
135 * in the given card_ret pointer.
137 * Returns zero if successful or a negative error code.
139 int snd_card_create(int idx
, const char *xid
,
140 struct module
*module
, int extra_size
,
141 struct snd_card
**card_ret
)
143 struct snd_card
*card
;
146 if (snd_BUG_ON(!card_ret
))
152 card
= kzalloc(sizeof(*card
) + extra_size
, GFP_KERNEL
);
156 if (!snd_info_check_reserved_words(xid
)) {
158 "given id string '%s' is reserved.\n", xid
);
162 strlcpy(card
->id
, xid
, sizeof(card
->id
));
165 mutex_lock(&snd_card_mutex
);
167 for (idx2
= 0; idx2
< SNDRV_CARDS
; idx2
++)
168 /* idx == -1 == 0xffff means: take any free slot */
169 if (~snd_cards_lock
& idx
& 1<<idx2
) {
170 if (module_slot_match(module
, idx2
)) {
177 for (idx2
= 0; idx2
< SNDRV_CARDS
; idx2
++)
178 /* idx == -1 == 0xffff means: take any free slot */
179 if (~snd_cards_lock
& idx
& 1<<idx2
) {
180 if (!slots
[idx2
] || !*slots
[idx2
]) {
188 else if (idx
< snd_ecards_limit
) {
189 if (snd_cards_lock
& (1 << idx
))
190 err
= -EBUSY
; /* invalid */
191 } else if (idx
>= SNDRV_CARDS
)
194 mutex_unlock(&snd_card_mutex
);
195 snd_printk(KERN_ERR
"cannot find the slot for index %d (range 0-%i), error: %d\n",
196 idx
, snd_ecards_limit
- 1, err
);
199 snd_cards_lock
|= 1 << idx
; /* lock it */
200 if (idx
>= snd_ecards_limit
)
201 snd_ecards_limit
= idx
+ 1; /* increase the limit */
202 mutex_unlock(&snd_card_mutex
);
204 card
->module
= module
;
205 INIT_LIST_HEAD(&card
->devices
);
206 init_rwsem(&card
->controls_rwsem
);
207 rwlock_init(&card
->ctl_files_rwlock
);
208 INIT_LIST_HEAD(&card
->controls
);
209 INIT_LIST_HEAD(&card
->ctl_files
);
210 spin_lock_init(&card
->files_lock
);
211 init_waitqueue_head(&card
->shutdown_sleep
);
213 mutex_init(&card
->power_lock
);
214 init_waitqueue_head(&card
->power_sleep
);
216 /* the control interface cannot be accessed from the user space until */
217 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
218 err
= snd_ctl_create(card
);
220 snd_printk(KERN_ERR
"unable to register control minors\n");
223 err
= snd_info_card_create(card
);
225 snd_printk(KERN_ERR
"unable to create card info\n");
229 card
->private_data
= (char *)card
+ sizeof(struct snd_card
);
234 snd_device_free_all(card
, SNDRV_DEV_CMD_PRE
);
239 EXPORT_SYMBOL(snd_card_create
);
241 /* return non-zero if a card is already locked */
242 int snd_card_locked(int card
)
246 mutex_lock(&snd_card_mutex
);
247 locked
= snd_cards_lock
& (1 << card
);
248 mutex_unlock(&snd_card_mutex
);
252 static loff_t
snd_disconnect_llseek(struct file
*file
, loff_t offset
, int orig
)
257 static ssize_t
snd_disconnect_read(struct file
*file
, char __user
*buf
,
258 size_t count
, loff_t
*offset
)
263 static ssize_t
snd_disconnect_write(struct file
*file
, const char __user
*buf
,
264 size_t count
, loff_t
*offset
)
269 static int snd_disconnect_release(struct inode
*inode
, struct file
*file
)
271 struct snd_monitor_file
*df
= NULL
, *_df
;
273 spin_lock(&shutdown_lock
);
274 list_for_each_entry(_df
, &shutdown_files
, shutdown_list
) {
275 if (_df
->file
== file
) {
280 spin_unlock(&shutdown_lock
);
283 if ((file
->f_flags
& FASYNC
) && df
->disconnected_f_op
->fasync
)
284 df
->disconnected_f_op
->fasync(-1, file
, 0);
285 return df
->disconnected_f_op
->release(inode
, file
);
288 panic("%s(%p, %p) failed!", __func__
, inode
, file
);
291 static unsigned int snd_disconnect_poll(struct file
* file
, poll_table
* wait
)
293 return POLLERR
| POLLNVAL
;
296 static long snd_disconnect_ioctl(struct file
*file
,
297 unsigned int cmd
, unsigned long arg
)
302 static int snd_disconnect_mmap(struct file
*file
, struct vm_area_struct
*vma
)
307 static int snd_disconnect_fasync(int fd
, struct file
*file
, int on
)
312 static const struct file_operations snd_shutdown_f_ops
=
314 .owner
= THIS_MODULE
,
315 .llseek
= snd_disconnect_llseek
,
316 .read
= snd_disconnect_read
,
317 .write
= snd_disconnect_write
,
318 .release
= snd_disconnect_release
,
319 .poll
= snd_disconnect_poll
,
320 .unlocked_ioctl
= snd_disconnect_ioctl
,
322 .compat_ioctl
= snd_disconnect_ioctl
,
324 .mmap
= snd_disconnect_mmap
,
325 .fasync
= snd_disconnect_fasync
329 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
330 * @card: soundcard structure
332 * Disconnects all APIs from the file-operations (user space).
334 * Returns zero, otherwise a negative error code.
336 * Note: The current implementation replaces all active file->f_op with special
337 * dummy file operations (they do nothing except release).
339 int snd_card_disconnect(struct snd_card
*card
)
341 struct snd_monitor_file
*mfile
;
348 spin_lock(&card
->files_lock
);
349 if (card
->shutdown
) {
350 spin_unlock(&card
->files_lock
);
354 spin_unlock(&card
->files_lock
);
356 /* phase 1: disable fops (user space) operations for ALSA API */
357 mutex_lock(&snd_card_mutex
);
358 snd_cards
[card
->number
] = NULL
;
359 snd_cards_lock
&= ~(1 << card
->number
);
360 mutex_unlock(&snd_card_mutex
);
362 /* phase 2: replace file->f_op with special dummy operations */
364 spin_lock(&card
->files_lock
);
369 /* it's critical part, use endless loop */
370 /* we have no room to fail */
371 mfile
->disconnected_f_op
= mfile
->file
->f_op
;
373 spin_lock(&shutdown_lock
);
374 list_add(&mfile
->shutdown_list
, &shutdown_files
);
375 spin_unlock(&shutdown_lock
);
377 mfile
->file
->f_op
= &snd_shutdown_f_ops
;
378 fops_get(mfile
->file
->f_op
);
382 spin_unlock(&card
->files_lock
);
384 /* phase 3: notify all connected devices about disconnection */
385 /* at this point, they cannot respond to any calls except release() */
387 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
388 if (snd_mixer_oss_notify_callback
)
389 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_DISCONNECT
);
392 /* notify all devices that we are disconnected */
393 err
= snd_device_disconnect_all(card
);
395 snd_printk(KERN_ERR
"not all devices for card %i can be disconnected\n", card
->number
);
397 snd_info_card_disconnect(card
);
398 #ifndef CONFIG_SYSFS_DEPRECATED
399 if (card
->card_dev
) {
400 device_unregister(card
->card_dev
);
401 card
->card_dev
= NULL
;
405 wake_up(&card
->power_sleep
);
410 EXPORT_SYMBOL(snd_card_disconnect
);
413 * snd_card_free - frees given soundcard structure
414 * @card: soundcard structure
416 * This function releases the soundcard structure and the all assigned
417 * devices automatically. That is, you don't have to release the devices
420 * Returns zero. Frees all associated devices and frees the control
421 * interface associated to given soundcard.
423 static int snd_card_do_free(struct snd_card
*card
)
425 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
426 if (snd_mixer_oss_notify_callback
)
427 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_FREE
);
429 if (snd_device_free_all(card
, SNDRV_DEV_CMD_PRE
) < 0) {
430 snd_printk(KERN_ERR
"unable to free all devices (pre)\n");
431 /* Fatal, but this situation should never occur */
433 if (snd_device_free_all(card
, SNDRV_DEV_CMD_NORMAL
) < 0) {
434 snd_printk(KERN_ERR
"unable to free all devices (normal)\n");
435 /* Fatal, but this situation should never occur */
437 if (snd_device_free_all(card
, SNDRV_DEV_CMD_POST
) < 0) {
438 snd_printk(KERN_ERR
"unable to free all devices (post)\n");
439 /* Fatal, but this situation should never occur */
441 if (card
->private_free
)
442 card
->private_free(card
);
443 snd_info_free_entry(card
->proc_id
);
444 if (snd_info_card_free(card
) < 0) {
445 snd_printk(KERN_WARNING
"unable to free card info\n");
446 /* Not fatal error */
452 int snd_card_free_when_closed(struct snd_card
*card
)
455 int ret
= snd_card_disconnect(card
);
459 spin_lock(&card
->files_lock
);
460 if (card
->files
== NULL
)
463 card
->free_on_last_close
= 1;
464 spin_unlock(&card
->files_lock
);
467 snd_card_do_free(card
);
471 EXPORT_SYMBOL(snd_card_free_when_closed
);
473 int snd_card_free(struct snd_card
*card
)
475 int ret
= snd_card_disconnect(card
);
479 /* wait, until all devices are ready for the free operation */
480 wait_event(card
->shutdown_sleep
, card
->files
== NULL
);
481 snd_card_do_free(card
);
485 EXPORT_SYMBOL(snd_card_free
);
487 static void choose_default_id(struct snd_card
*card
)
489 int i
, len
, idx_flag
= 0, loops
= SNDRV_CARDS
;
492 id
= spos
= card
->shortname
;
493 while (*id
!= '\0') {
499 while (*spos
!= '\0' && !isalnum(*spos
))
502 *id
++ = isalpha(card
->shortname
[0]) ? card
->shortname
[0] : 'D';
503 while (*spos
!= '\0' && (size_t)(id
- card
->id
) < sizeof(card
->id
) - 1) {
513 strcpy(id
, "default");
517 snd_printk(KERN_ERR
"unable to choose default card id (%s)\n", id
);
518 strcpy(card
->id
, card
->proc_root
->name
);
521 if (!snd_info_check_reserved_words(id
))
523 for (i
= 0; i
< snd_ecards_limit
; i
++) {
524 if (snd_cards
[i
] && !strcmp(snd_cards
[i
]->id
, id
))
532 if (id
[len
-1] != '9')
536 } else if ((size_t)len
<= sizeof(card
->id
) - 3) {
541 if ((size_t)len
<= sizeof(card
->id
) - 2)
551 #ifndef CONFIG_SYSFS_DEPRECATED
553 card_id_show_attr(struct device
*dev
,
554 struct device_attribute
*attr
, char *buf
)
556 struct snd_card
*card
= dev_get_drvdata(dev
);
557 return snprintf(buf
, PAGE_SIZE
, "%s\n", card
? card
->id
: "(null)");
561 card_id_store_attr(struct device
*dev
, struct device_attribute
*attr
,
562 const char *buf
, size_t count
)
564 struct snd_card
*card
= dev_get_drvdata(dev
);
565 char buf1
[sizeof(card
->id
)];
566 size_t copy
= count
> sizeof(card
->id
) - 1 ?
567 sizeof(card
->id
) - 1 : count
;
571 for (idx
= 0; idx
< copy
; idx
++) {
573 if (!isalnum(c
) && c
!= '_' && c
!= '-')
576 memcpy(buf1
, buf
, copy
);
578 mutex_lock(&snd_card_mutex
);
579 if (!snd_info_check_reserved_words(buf1
)) {
581 mutex_unlock(&snd_card_mutex
);
584 for (idx
= 0; idx
< snd_ecards_limit
; idx
++) {
585 if (snd_cards
[idx
] && !strcmp(snd_cards
[idx
]->id
, buf1
))
588 strcpy(card
->id
, buf1
);
589 snd_info_card_id_change(card
);
590 mutex_unlock(&snd_card_mutex
);
595 static struct device_attribute card_id_attrs
=
596 __ATTR(id
, S_IRUGO
| S_IWUSR
, card_id_show_attr
, card_id_store_attr
);
599 card_number_show_attr(struct device
*dev
,
600 struct device_attribute
*attr
, char *buf
)
602 struct snd_card
*card
= dev_get_drvdata(dev
);
603 return snprintf(buf
, PAGE_SIZE
, "%i\n", card
? card
->number
: -1);
606 static struct device_attribute card_number_attrs
=
607 __ATTR(number
, S_IRUGO
, card_number_show_attr
, NULL
);
608 #endif /* CONFIG_SYSFS_DEPRECATED */
611 * snd_card_register - register the soundcard
612 * @card: soundcard structure
614 * This function registers all the devices assigned to the soundcard.
615 * Until calling this, the ALSA control interface is blocked from the
616 * external accesses. Thus, you should call this function at the end
617 * of the initialization of the card.
619 * Returns zero otherwise a negative error code if the registrain failed.
621 int snd_card_register(struct snd_card
*card
)
625 if (snd_BUG_ON(!card
))
627 #ifndef CONFIG_SYSFS_DEPRECATED
628 if (!card
->card_dev
) {
629 card
->card_dev
= device_create(sound_class
, card
->dev
,
631 "card%i", card
->number
);
632 if (IS_ERR(card
->card_dev
))
633 card
->card_dev
= NULL
;
636 if ((err
= snd_device_register_all(card
)) < 0)
638 mutex_lock(&snd_card_mutex
);
639 if (snd_cards
[card
->number
]) {
640 /* already registered */
641 mutex_unlock(&snd_card_mutex
);
644 if (card
->id
[0] == '\0')
645 choose_default_id(card
);
646 snd_cards
[card
->number
] = card
;
647 mutex_unlock(&snd_card_mutex
);
648 init_info_for_card(card
);
649 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
650 if (snd_mixer_oss_notify_callback
)
651 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_REGISTER
);
653 #ifndef CONFIG_SYSFS_DEPRECATED
654 if (card
->card_dev
) {
655 err
= device_create_file(card
->card_dev
, &card_id_attrs
);
658 err
= device_create_file(card
->card_dev
, &card_number_attrs
);
666 EXPORT_SYMBOL(snd_card_register
);
668 #ifdef CONFIG_PROC_FS
669 static struct snd_info_entry
*snd_card_info_entry
;
671 static void snd_card_info_read(struct snd_info_entry
*entry
,
672 struct snd_info_buffer
*buffer
)
675 struct snd_card
*card
;
677 for (idx
= count
= 0; idx
< SNDRV_CARDS
; idx
++) {
678 mutex_lock(&snd_card_mutex
);
679 if ((card
= snd_cards
[idx
]) != NULL
) {
681 snd_iprintf(buffer
, "%2i [%-15s]: %s - %s\n",
686 snd_iprintf(buffer
, " %s\n",
689 mutex_unlock(&snd_card_mutex
);
692 snd_iprintf(buffer
, "--- no soundcards ---\n");
695 #ifdef CONFIG_SND_OSSEMUL
697 void snd_card_info_read_oss(struct snd_info_buffer
*buffer
)
700 struct snd_card
*card
;
702 for (idx
= count
= 0; idx
< SNDRV_CARDS
; idx
++) {
703 mutex_lock(&snd_card_mutex
);
704 if ((card
= snd_cards
[idx
]) != NULL
) {
706 snd_iprintf(buffer
, "%s\n", card
->longname
);
708 mutex_unlock(&snd_card_mutex
);
711 snd_iprintf(buffer
, "--- no soundcards ---\n");
718 static struct snd_info_entry
*snd_card_module_info_entry
;
719 static void snd_card_module_info_read(struct snd_info_entry
*entry
,
720 struct snd_info_buffer
*buffer
)
723 struct snd_card
*card
;
725 for (idx
= 0; idx
< SNDRV_CARDS
; idx
++) {
726 mutex_lock(&snd_card_mutex
);
727 if ((card
= snd_cards
[idx
]) != NULL
)
728 snd_iprintf(buffer
, "%2i %s\n",
729 idx
, card
->module
->name
);
730 mutex_unlock(&snd_card_mutex
);
735 int __init
snd_card_info_init(void)
737 struct snd_info_entry
*entry
;
739 entry
= snd_info_create_module_entry(THIS_MODULE
, "cards", NULL
);
742 entry
->c
.text
.read
= snd_card_info_read
;
743 if (snd_info_register(entry
) < 0) {
744 snd_info_free_entry(entry
);
747 snd_card_info_entry
= entry
;
750 entry
= snd_info_create_module_entry(THIS_MODULE
, "modules", NULL
);
752 entry
->c
.text
.read
= snd_card_module_info_read
;
753 if (snd_info_register(entry
) < 0)
754 snd_info_free_entry(entry
);
756 snd_card_module_info_entry
= entry
;
763 int __exit
snd_card_info_done(void)
765 snd_info_free_entry(snd_card_info_entry
);
767 snd_info_free_entry(snd_card_module_info_entry
);
772 #endif /* CONFIG_PROC_FS */
775 * snd_component_add - add a component string
776 * @card: soundcard structure
777 * @component: the component id string
779 * This function adds the component id string to the supported list.
780 * The component can be referred from the alsa-lib.
782 * Returns zero otherwise a negative error code.
785 int snd_component_add(struct snd_card
*card
, const char *component
)
788 int len
= strlen(component
);
790 ptr
= strstr(card
->components
, component
);
792 if (ptr
[len
] == '\0' || ptr
[len
] == ' ') /* already there */
795 if (strlen(card
->components
) + 1 + len
+ 1 > sizeof(card
->components
)) {
799 if (card
->components
[0] != '\0')
800 strcat(card
->components
, " ");
801 strcat(card
->components
, component
);
805 EXPORT_SYMBOL(snd_component_add
);
808 * snd_card_file_add - add the file to the file list of the card
809 * @card: soundcard structure
810 * @file: file pointer
812 * This function adds the file to the file linked-list of the card.
813 * This linked-list is used to keep tracking the connection state,
814 * and to avoid the release of busy resources by hotplug.
816 * Returns zero or a negative error code.
818 int snd_card_file_add(struct snd_card
*card
, struct file
*file
)
820 struct snd_monitor_file
*mfile
;
822 mfile
= kmalloc(sizeof(*mfile
), GFP_KERNEL
);
826 mfile
->disconnected_f_op
= NULL
;
828 spin_lock(&card
->files_lock
);
829 if (card
->shutdown
) {
830 spin_unlock(&card
->files_lock
);
834 mfile
->next
= card
->files
;
836 spin_unlock(&card
->files_lock
);
840 EXPORT_SYMBOL(snd_card_file_add
);
843 * snd_card_file_remove - remove the file from the file list
844 * @card: soundcard structure
845 * @file: file pointer
847 * This function removes the file formerly added to the card via
848 * snd_card_file_add() function.
849 * If all files are removed and snd_card_free_when_closed() was
850 * called beforehand, it processes the pending release of
853 * Returns zero or a negative error code.
855 int snd_card_file_remove(struct snd_card
*card
, struct file
*file
)
857 struct snd_monitor_file
*mfile
, *pfile
= NULL
;
860 spin_lock(&card
->files_lock
);
863 if (mfile
->file
== file
) {
865 pfile
->next
= mfile
->next
;
867 card
->files
= mfile
->next
;
873 if (mfile
&& mfile
->disconnected_f_op
) {
874 fops_put(mfile
->disconnected_f_op
);
875 spin_lock(&shutdown_lock
);
876 list_del(&mfile
->shutdown_list
);
877 spin_unlock(&shutdown_lock
);
879 if (card
->files
== NULL
)
881 spin_unlock(&card
->files_lock
);
883 wake_up(&card
->shutdown_sleep
);
884 if (card
->free_on_last_close
)
885 snd_card_do_free(card
);
888 snd_printk(KERN_ERR
"ALSA card file remove problem (%p)\n", file
);
895 EXPORT_SYMBOL(snd_card_file_remove
);
899 * snd_power_wait - wait until the power-state is changed.
900 * @card: soundcard structure
901 * @power_state: expected power state
903 * Waits until the power-state is changed.
905 * Note: the power lock must be active before call.
907 int snd_power_wait(struct snd_card
*card
, unsigned int power_state
)
913 if (snd_power_get_state(card
) == power_state
)
915 init_waitqueue_entry(&wait
, current
);
916 add_wait_queue(&card
->power_sleep
, &wait
);
918 if (card
->shutdown
) {
922 if (snd_power_get_state(card
) == power_state
)
924 set_current_state(TASK_UNINTERRUPTIBLE
);
925 snd_power_unlock(card
);
926 schedule_timeout(30 * HZ
);
927 snd_power_lock(card
);
929 remove_wait_queue(&card
->power_sleep
, &wait
);
933 EXPORT_SYMBOL(snd_power_wait
);
934 #endif /* CONFIG_PM */