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/module.h>
25 #include <linux/device.h>
26 #include <linux/file.h>
27 #include <linux/slab.h>
28 #include <linux/time.h>
29 #include <linux/ctype.h>
31 #include <linux/completion.h>
33 #include <sound/core.h>
34 #include <sound/control.h>
35 #include <sound/info.h>
37 /* monitor files for graceful shutdown (hotplug) */
38 struct snd_monitor_file
{
40 const struct file_operations
*disconnected_f_op
;
41 struct list_head shutdown_list
; /* still need to shutdown */
42 struct list_head list
; /* link of monitor files */
45 static DEFINE_SPINLOCK(shutdown_lock
);
46 static LIST_HEAD(shutdown_files
);
48 static const struct file_operations snd_shutdown_f_ops
;
50 /* locked for registering/using */
51 static DECLARE_BITMAP(snd_cards_lock
, SNDRV_CARDS
);
52 struct snd_card
*snd_cards
[SNDRV_CARDS
];
53 EXPORT_SYMBOL(snd_cards
);
55 static DEFINE_MUTEX(snd_card_mutex
);
57 static char *slots
[SNDRV_CARDS
];
58 module_param_array(slots
, charp
, NULL
, 0444);
59 MODULE_PARM_DESC(slots
, "Module names assigned to the slots.");
61 /* return non-zero if the given index is reserved for the given
62 * module via slots option
64 static int module_slot_match(struct module
*module
, int idx
)
70 if (!module
|| !*module
->name
|| !slots
[idx
])
76 match
= 0; /* negative match */
79 /* compare module name strings
80 * hyphens are handled as equivalent with underscore
98 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
99 int (*snd_mixer_oss_notify_callback
)(struct snd_card
*card
, int free_flag
);
100 EXPORT_SYMBOL(snd_mixer_oss_notify_callback
);
103 #ifdef CONFIG_PROC_FS
104 static void snd_card_id_read(struct snd_info_entry
*entry
,
105 struct snd_info_buffer
*buffer
)
107 snd_iprintf(buffer
, "%s\n", entry
->card
->id
);
110 static inline int init_info_for_card(struct snd_card
*card
)
113 struct snd_info_entry
*entry
;
115 if ((err
= snd_info_card_register(card
)) < 0) {
116 dev_dbg(card
->dev
, "unable to create card info\n");
119 if ((entry
= snd_info_create_card_entry(card
, "id", card
->proc_root
)) == NULL
) {
120 dev_dbg(card
->dev
, "unable to create card entry\n");
123 entry
->c
.text
.read
= snd_card_id_read
;
124 if (snd_info_register(entry
) < 0) {
125 snd_info_free_entry(entry
);
128 card
->proc_id
= entry
;
131 #else /* !CONFIG_PROC_FS */
132 #define init_info_for_card(card)
135 static int check_empty_slot(struct module
*module
, int slot
)
137 return !slots
[slot
] || !*slots
[slot
];
140 /* return an empty slot number (>= 0) found in the given bitmask @mask.
141 * @mask == -1 == 0xffffffff means: take any free slot up to 32
142 * when no slot is available, return the original @mask as is.
144 static int get_slot_from_bitmask(int mask
, int (*check
)(struct module
*, int),
145 struct module
*module
)
149 for (slot
= 0; slot
< SNDRV_CARDS
; slot
++) {
150 if (slot
< 32 && !(mask
& (1U << slot
)))
152 if (!test_bit(slot
, snd_cards_lock
)) {
153 if (check(module
, slot
))
154 return slot
; /* found */
157 return mask
; /* unchanged */
160 static int snd_card_do_free(struct snd_card
*card
);
161 static const struct attribute_group
*card_dev_attr_groups
[];
163 static void release_card_device(struct device
*dev
)
165 snd_card_do_free(dev_to_snd_card(dev
));
169 * snd_card_new - create and initialize a soundcard structure
170 * @parent: the parent device object
171 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
172 * @xid: card identification (ASCII string)
173 * @module: top level module for locking
174 * @extra_size: allocate this extra size after the main soundcard structure
175 * @card_ret: the pointer to store the created card instance
177 * Creates and initializes a soundcard structure.
179 * The function allocates snd_card instance via kzalloc with the given
180 * space for the driver to use freely. The allocated struct is stored
181 * in the given card_ret pointer.
183 * Return: Zero if successful or a negative error code.
185 int snd_card_new(struct device
*parent
, int idx
, const char *xid
,
186 struct module
*module
, int extra_size
,
187 struct snd_card
**card_ret
)
189 struct snd_card
*card
;
192 if (snd_BUG_ON(!card_ret
))
198 card
= kzalloc(sizeof(*card
) + extra_size
, GFP_KERNEL
);
202 card
->private_data
= (char *)card
+ sizeof(struct snd_card
);
204 strlcpy(card
->id
, xid
, sizeof(card
->id
));
206 mutex_lock(&snd_card_mutex
);
207 if (idx
< 0) /* first check the matching module-name slot */
208 idx
= get_slot_from_bitmask(idx
, module_slot_match
, module
);
209 if (idx
< 0) /* if not matched, assign an empty slot */
210 idx
= get_slot_from_bitmask(idx
, check_empty_slot
, module
);
213 else if (idx
< snd_ecards_limit
) {
214 if (test_bit(idx
, snd_cards_lock
))
215 err
= -EBUSY
; /* invalid */
216 } else if (idx
>= SNDRV_CARDS
)
219 mutex_unlock(&snd_card_mutex
);
220 dev_err(parent
, "cannot find the slot for index %d (range 0-%i), error: %d\n",
221 idx
, snd_ecards_limit
- 1, err
);
225 set_bit(idx
, snd_cards_lock
); /* lock it */
226 if (idx
>= snd_ecards_limit
)
227 snd_ecards_limit
= idx
+ 1; /* increase the limit */
228 mutex_unlock(&snd_card_mutex
);
231 card
->module
= module
;
232 INIT_LIST_HEAD(&card
->devices
);
233 init_rwsem(&card
->controls_rwsem
);
234 rwlock_init(&card
->ctl_files_rwlock
);
235 INIT_LIST_HEAD(&card
->controls
);
236 INIT_LIST_HEAD(&card
->ctl_files
);
237 spin_lock_init(&card
->files_lock
);
238 INIT_LIST_HEAD(&card
->files_list
);
240 mutex_init(&card
->power_lock
);
241 init_waitqueue_head(&card
->power_sleep
);
244 device_initialize(&card
->card_dev
);
245 card
->card_dev
.parent
= parent
;
246 card
->card_dev
.class = sound_class
;
247 card
->card_dev
.release
= release_card_device
;
248 card
->card_dev
.groups
= card_dev_attr_groups
;
249 err
= kobject_set_name(&card
->card_dev
.kobj
, "card%d", idx
);
253 /* the control interface cannot be accessed from the user space until */
254 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
255 err
= snd_ctl_create(card
);
257 dev_err(parent
, "unable to register control minors\n");
260 err
= snd_info_card_create(card
);
262 dev_err(parent
, "unable to create card info\n");
269 snd_device_free_all(card
, SNDRV_DEV_CMD_PRE
);
271 put_device(&card
->card_dev
);
274 EXPORT_SYMBOL(snd_card_new
);
276 /* return non-zero if a card is already locked */
277 int snd_card_locked(int card
)
281 mutex_lock(&snd_card_mutex
);
282 locked
= test_bit(card
, snd_cards_lock
);
283 mutex_unlock(&snd_card_mutex
);
287 static loff_t
snd_disconnect_llseek(struct file
*file
, loff_t offset
, int orig
)
292 static ssize_t
snd_disconnect_read(struct file
*file
, char __user
*buf
,
293 size_t count
, loff_t
*offset
)
298 static ssize_t
snd_disconnect_write(struct file
*file
, const char __user
*buf
,
299 size_t count
, loff_t
*offset
)
304 static int snd_disconnect_release(struct inode
*inode
, struct file
*file
)
306 struct snd_monitor_file
*df
= NULL
, *_df
;
308 spin_lock(&shutdown_lock
);
309 list_for_each_entry(_df
, &shutdown_files
, shutdown_list
) {
310 if (_df
->file
== file
) {
312 list_del_init(&df
->shutdown_list
);
316 spin_unlock(&shutdown_lock
);
319 if ((file
->f_flags
& FASYNC
) && df
->disconnected_f_op
->fasync
)
320 df
->disconnected_f_op
->fasync(-1, file
, 0);
321 return df
->disconnected_f_op
->release(inode
, file
);
324 panic("%s(%p, %p) failed!", __func__
, inode
, file
);
327 static unsigned int snd_disconnect_poll(struct file
* file
, poll_table
* wait
)
329 return POLLERR
| POLLNVAL
;
332 static long snd_disconnect_ioctl(struct file
*file
,
333 unsigned int cmd
, unsigned long arg
)
338 static int snd_disconnect_mmap(struct file
*file
, struct vm_area_struct
*vma
)
343 static int snd_disconnect_fasync(int fd
, struct file
*file
, int on
)
348 static const struct file_operations snd_shutdown_f_ops
=
350 .owner
= THIS_MODULE
,
351 .llseek
= snd_disconnect_llseek
,
352 .read
= snd_disconnect_read
,
353 .write
= snd_disconnect_write
,
354 .release
= snd_disconnect_release
,
355 .poll
= snd_disconnect_poll
,
356 .unlocked_ioctl
= snd_disconnect_ioctl
,
358 .compat_ioctl
= snd_disconnect_ioctl
,
360 .mmap
= snd_disconnect_mmap
,
361 .fasync
= snd_disconnect_fasync
365 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
366 * @card: soundcard structure
368 * Disconnects all APIs from the file-operations (user space).
370 * Return: Zero, otherwise a negative error code.
372 * Note: The current implementation replaces all active file->f_op with special
373 * dummy file operations (they do nothing except release).
375 int snd_card_disconnect(struct snd_card
*card
)
377 struct snd_monitor_file
*mfile
;
383 spin_lock(&card
->files_lock
);
384 if (card
->shutdown
) {
385 spin_unlock(&card
->files_lock
);
389 spin_unlock(&card
->files_lock
);
391 /* phase 1: disable fops (user space) operations for ALSA API */
392 mutex_lock(&snd_card_mutex
);
393 snd_cards
[card
->number
] = NULL
;
394 clear_bit(card
->number
, snd_cards_lock
);
395 mutex_unlock(&snd_card_mutex
);
397 /* phase 2: replace file->f_op with special dummy operations */
399 spin_lock(&card
->files_lock
);
400 list_for_each_entry(mfile
, &card
->files_list
, list
) {
401 /* it's critical part, use endless loop */
402 /* we have no room to fail */
403 mfile
->disconnected_f_op
= mfile
->file
->f_op
;
405 spin_lock(&shutdown_lock
);
406 list_add(&mfile
->shutdown_list
, &shutdown_files
);
407 spin_unlock(&shutdown_lock
);
409 mfile
->file
->f_op
= &snd_shutdown_f_ops
;
410 fops_get(mfile
->file
->f_op
);
412 spin_unlock(&card
->files_lock
);
414 /* phase 3: notify all connected devices about disconnection */
415 /* at this point, they cannot respond to any calls except release() */
417 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
418 if (snd_mixer_oss_notify_callback
)
419 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_DISCONNECT
);
422 /* notify all devices that we are disconnected */
423 err
= snd_device_disconnect_all(card
);
425 dev_err(card
->dev
, "not all devices for card %i can be disconnected\n", card
->number
);
427 snd_info_card_disconnect(card
);
428 if (card
->registered
) {
429 device_del(&card
->card_dev
);
430 card
->registered
= false;
433 wake_up(&card
->power_sleep
);
438 EXPORT_SYMBOL(snd_card_disconnect
);
441 * snd_card_free - frees given soundcard structure
442 * @card: soundcard structure
444 * This function releases the soundcard structure and the all assigned
445 * devices automatically. That is, you don't have to release the devices
448 * Return: Zero. Frees all associated devices and frees the control
449 * interface associated to given soundcard.
451 static int snd_card_do_free(struct snd_card
*card
)
453 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
454 if (snd_mixer_oss_notify_callback
)
455 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_FREE
);
457 if (snd_device_free_all(card
, SNDRV_DEV_CMD_PRE
) < 0) {
458 dev_err(card
->dev
, "unable to free all devices (pre)\n");
459 /* Fatal, but this situation should never occur */
461 if (snd_device_free_all(card
, SNDRV_DEV_CMD_NORMAL
) < 0) {
462 dev_err(card
->dev
, "unable to free all devices (normal)\n");
463 /* Fatal, but this situation should never occur */
465 if (snd_device_free_all(card
, SNDRV_DEV_CMD_POST
) < 0) {
466 dev_err(card
->dev
, "unable to free all devices (post)\n");
467 /* Fatal, but this situation should never occur */
469 if (card
->private_free
)
470 card
->private_free(card
);
471 snd_info_free_entry(card
->proc_id
);
472 if (snd_info_card_free(card
) < 0) {
473 dev_warn(card
->dev
, "unable to free card info\n");
474 /* Not fatal error */
476 if (card
->release_completion
)
477 complete(card
->release_completion
);
482 int snd_card_free_when_closed(struct snd_card
*card
)
484 int ret
= snd_card_disconnect(card
);
487 put_device(&card
->card_dev
);
490 EXPORT_SYMBOL(snd_card_free_when_closed
);
492 int snd_card_free(struct snd_card
*card
)
494 struct completion released
;
497 init_completion(&released
);
498 card
->release_completion
= &released
;
499 ret
= snd_card_free_when_closed(card
);
502 /* wait, until all devices are ready for the free operation */
503 wait_for_completion(&released
);
506 EXPORT_SYMBOL(snd_card_free
);
508 /* retrieve the last word of shortname or longname */
509 static const char *retrieve_id_from_card_name(const char *name
)
511 const char *spos
= name
;
514 if (isspace(*name
) && isalnum(name
[1]))
521 /* return true if the given id string doesn't conflict any other card ids */
522 static bool card_id_ok(struct snd_card
*card
, const char *id
)
525 if (!snd_info_check_reserved_words(id
))
527 for (i
= 0; i
< snd_ecards_limit
; i
++) {
528 if (snd_cards
[i
] && snd_cards
[i
] != card
&&
529 !strcmp(snd_cards
[i
]->id
, id
))
535 /* copy to card->id only with valid letters from nid */
536 static void copy_valid_id_string(struct snd_card
*card
, const char *src
,
541 while (*nid
&& !isalnum(*nid
))
544 *id
++ = isalpha(*src
) ? *src
: 'D';
545 while (*nid
&& (size_t)(id
- card
->id
) < sizeof(card
->id
) - 1) {
553 /* Set card->id from the given string
554 * If the string conflicts with other ids, add a suffix to make it unique.
556 static void snd_card_set_id_no_lock(struct snd_card
*card
, const char *src
,
560 bool is_default
= false;
563 copy_valid_id_string(card
, src
, nid
);
567 /* use "Default" for obviously invalid strings
568 * ("card" conflicts with proc directories)
570 if (!*id
|| !strncmp(id
, "card", 4)) {
571 strcpy(id
, "Default");
576 for (loops
= 0; loops
< SNDRV_CARDS
; loops
++) {
578 char sfxstr
[5]; /* "_012" */
581 if (card_id_ok(card
, id
))
584 /* Add _XYZ suffix */
585 sprintf(sfxstr
, "_%X", loops
+ 1);
586 sfxlen
= strlen(sfxstr
);
587 if (len
+ sfxlen
>= sizeof(card
->id
))
588 spos
= id
+ sizeof(card
->id
) - sfxlen
- 1;
591 strcpy(spos
, sfxstr
);
593 /* fallback to the default id */
599 dev_err(card
->dev
, "unable to set card id (%s)\n", id
);
600 if (card
->proc_root
->name
)
601 strlcpy(card
->id
, card
->proc_root
->name
, sizeof(card
->id
));
605 * snd_card_set_id - set card identification name
606 * @card: soundcard structure
607 * @nid: new identification string
609 * This function sets the card identification and checks for name
612 void snd_card_set_id(struct snd_card
*card
, const char *nid
)
614 /* check if user specified own card->id */
615 if (card
->id
[0] != '\0')
617 mutex_lock(&snd_card_mutex
);
618 snd_card_set_id_no_lock(card
, nid
, nid
);
619 mutex_unlock(&snd_card_mutex
);
621 EXPORT_SYMBOL(snd_card_set_id
);
624 card_id_show_attr(struct device
*dev
,
625 struct device_attribute
*attr
, char *buf
)
627 struct snd_card
*card
= container_of(dev
, struct snd_card
, card_dev
);
628 return snprintf(buf
, PAGE_SIZE
, "%s\n", card
->id
);
632 card_id_store_attr(struct device
*dev
, struct device_attribute
*attr
,
633 const char *buf
, size_t count
)
635 struct snd_card
*card
= container_of(dev
, struct snd_card
, card_dev
);
636 char buf1
[sizeof(card
->id
)];
637 size_t copy
= count
> sizeof(card
->id
) - 1 ?
638 sizeof(card
->id
) - 1 : count
;
642 for (idx
= 0; idx
< copy
; idx
++) {
644 if (!isalnum(c
) && c
!= '_' && c
!= '-')
647 memcpy(buf1
, buf
, copy
);
649 mutex_lock(&snd_card_mutex
);
650 if (!card_id_ok(NULL
, buf1
)) {
651 mutex_unlock(&snd_card_mutex
);
654 strcpy(card
->id
, buf1
);
655 snd_info_card_id_change(card
);
656 mutex_unlock(&snd_card_mutex
);
661 static DEVICE_ATTR(id
, S_IRUGO
| S_IWUSR
, card_id_show_attr
, card_id_store_attr
);
664 card_number_show_attr(struct device
*dev
,
665 struct device_attribute
*attr
, char *buf
)
667 struct snd_card
*card
= container_of(dev
, struct snd_card
, card_dev
);
668 return snprintf(buf
, PAGE_SIZE
, "%i\n", card
->number
);
671 static DEVICE_ATTR(number
, S_IRUGO
, card_number_show_attr
, NULL
);
673 static struct attribute
*card_dev_attrs
[] = {
675 &dev_attr_number
.attr
,
679 static struct attribute_group card_dev_attr_group
= {
680 .attrs
= card_dev_attrs
,
683 static const struct attribute_group
*card_dev_attr_groups
[] = {
684 &card_dev_attr_group
,
689 * snd_card_register - register the soundcard
690 * @card: soundcard structure
692 * This function registers all the devices assigned to the soundcard.
693 * Until calling this, the ALSA control interface is blocked from the
694 * external accesses. Thus, you should call this function at the end
695 * of the initialization of the card.
697 * Return: Zero otherwise a negative error code if the registration failed.
699 int snd_card_register(struct snd_card
*card
)
703 if (snd_BUG_ON(!card
))
706 if (!card
->registered
) {
707 err
= device_add(&card
->card_dev
);
710 card
->registered
= true;
713 if ((err
= snd_device_register_all(card
)) < 0)
715 mutex_lock(&snd_card_mutex
);
716 if (snd_cards
[card
->number
]) {
717 /* already registered */
718 mutex_unlock(&snd_card_mutex
);
722 /* make a unique id name from the given string */
723 char tmpid
[sizeof(card
->id
)];
724 memcpy(tmpid
, card
->id
, sizeof(card
->id
));
725 snd_card_set_id_no_lock(card
, tmpid
, tmpid
);
727 /* create an id from either shortname or longname */
729 src
= *card
->shortname
? card
->shortname
: card
->longname
;
730 snd_card_set_id_no_lock(card
, src
,
731 retrieve_id_from_card_name(src
));
733 snd_cards
[card
->number
] = card
;
734 mutex_unlock(&snd_card_mutex
);
735 init_info_for_card(card
);
736 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
737 if (snd_mixer_oss_notify_callback
)
738 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_REGISTER
);
743 EXPORT_SYMBOL(snd_card_register
);
745 #ifdef CONFIG_PROC_FS
746 static struct snd_info_entry
*snd_card_info_entry
;
748 static void snd_card_info_read(struct snd_info_entry
*entry
,
749 struct snd_info_buffer
*buffer
)
752 struct snd_card
*card
;
754 for (idx
= count
= 0; idx
< SNDRV_CARDS
; idx
++) {
755 mutex_lock(&snd_card_mutex
);
756 if ((card
= snd_cards
[idx
]) != NULL
) {
758 snd_iprintf(buffer
, "%2i [%-15s]: %s - %s\n",
763 snd_iprintf(buffer
, " %s\n",
766 mutex_unlock(&snd_card_mutex
);
769 snd_iprintf(buffer
, "--- no soundcards ---\n");
772 #ifdef CONFIG_SND_OSSEMUL
774 void snd_card_info_read_oss(struct snd_info_buffer
*buffer
)
777 struct snd_card
*card
;
779 for (idx
= count
= 0; idx
< SNDRV_CARDS
; idx
++) {
780 mutex_lock(&snd_card_mutex
);
781 if ((card
= snd_cards
[idx
]) != NULL
) {
783 snd_iprintf(buffer
, "%s\n", card
->longname
);
785 mutex_unlock(&snd_card_mutex
);
788 snd_iprintf(buffer
, "--- no soundcards ---\n");
795 static struct snd_info_entry
*snd_card_module_info_entry
;
796 static void snd_card_module_info_read(struct snd_info_entry
*entry
,
797 struct snd_info_buffer
*buffer
)
800 struct snd_card
*card
;
802 for (idx
= 0; idx
< SNDRV_CARDS
; idx
++) {
803 mutex_lock(&snd_card_mutex
);
804 if ((card
= snd_cards
[idx
]) != NULL
)
805 snd_iprintf(buffer
, "%2i %s\n",
806 idx
, card
->module
->name
);
807 mutex_unlock(&snd_card_mutex
);
812 int __init
snd_card_info_init(void)
814 struct snd_info_entry
*entry
;
816 entry
= snd_info_create_module_entry(THIS_MODULE
, "cards", NULL
);
819 entry
->c
.text
.read
= snd_card_info_read
;
820 if (snd_info_register(entry
) < 0) {
821 snd_info_free_entry(entry
);
824 snd_card_info_entry
= entry
;
827 entry
= snd_info_create_module_entry(THIS_MODULE
, "modules", NULL
);
829 entry
->c
.text
.read
= snd_card_module_info_read
;
830 if (snd_info_register(entry
) < 0)
831 snd_info_free_entry(entry
);
833 snd_card_module_info_entry
= entry
;
840 int __exit
snd_card_info_done(void)
842 snd_info_free_entry(snd_card_info_entry
);
844 snd_info_free_entry(snd_card_module_info_entry
);
849 #endif /* CONFIG_PROC_FS */
852 * snd_component_add - add a component string
853 * @card: soundcard structure
854 * @component: the component id string
856 * This function adds the component id string to the supported list.
857 * The component can be referred from the alsa-lib.
859 * Return: Zero otherwise a negative error code.
862 int snd_component_add(struct snd_card
*card
, const char *component
)
865 int len
= strlen(component
);
867 ptr
= strstr(card
->components
, component
);
869 if (ptr
[len
] == '\0' || ptr
[len
] == ' ') /* already there */
872 if (strlen(card
->components
) + 1 + len
+ 1 > sizeof(card
->components
)) {
876 if (card
->components
[0] != '\0')
877 strcat(card
->components
, " ");
878 strcat(card
->components
, component
);
882 EXPORT_SYMBOL(snd_component_add
);
885 * snd_card_file_add - add the file to the file list of the card
886 * @card: soundcard structure
887 * @file: file pointer
889 * This function adds the file to the file linked-list of the card.
890 * This linked-list is used to keep tracking the connection state,
891 * and to avoid the release of busy resources by hotplug.
893 * Return: zero or a negative error code.
895 int snd_card_file_add(struct snd_card
*card
, struct file
*file
)
897 struct snd_monitor_file
*mfile
;
899 mfile
= kmalloc(sizeof(*mfile
), GFP_KERNEL
);
903 mfile
->disconnected_f_op
= NULL
;
904 INIT_LIST_HEAD(&mfile
->shutdown_list
);
905 spin_lock(&card
->files_lock
);
906 if (card
->shutdown
) {
907 spin_unlock(&card
->files_lock
);
911 list_add(&mfile
->list
, &card
->files_list
);
912 get_device(&card
->card_dev
);
913 spin_unlock(&card
->files_lock
);
917 EXPORT_SYMBOL(snd_card_file_add
);
920 * snd_card_file_remove - remove the file from the file list
921 * @card: soundcard structure
922 * @file: file pointer
924 * This function removes the file formerly added to the card via
925 * snd_card_file_add() function.
926 * If all files are removed and snd_card_free_when_closed() was
927 * called beforehand, it processes the pending release of
930 * Return: Zero or a negative error code.
932 int snd_card_file_remove(struct snd_card
*card
, struct file
*file
)
934 struct snd_monitor_file
*mfile
, *found
= NULL
;
936 spin_lock(&card
->files_lock
);
937 list_for_each_entry(mfile
, &card
->files_list
, list
) {
938 if (mfile
->file
== file
) {
939 list_del(&mfile
->list
);
940 spin_lock(&shutdown_lock
);
941 list_del(&mfile
->shutdown_list
);
942 spin_unlock(&shutdown_lock
);
943 if (mfile
->disconnected_f_op
)
944 fops_put(mfile
->disconnected_f_op
);
949 spin_unlock(&card
->files_lock
);
951 dev_err(card
->dev
, "card file remove problem (%p)\n", file
);
955 put_device(&card
->card_dev
);
959 EXPORT_SYMBOL(snd_card_file_remove
);
963 * snd_power_wait - wait until the power-state is changed.
964 * @card: soundcard structure
965 * @power_state: expected power state
967 * Waits until the power-state is changed.
969 * Return: Zero if successful, or a negative error code.
971 * Note: the power lock must be active before call.
973 int snd_power_wait(struct snd_card
*card
, unsigned int power_state
)
979 if (snd_power_get_state(card
) == power_state
)
981 init_waitqueue_entry(&wait
, current
);
982 add_wait_queue(&card
->power_sleep
, &wait
);
984 if (card
->shutdown
) {
988 if (snd_power_get_state(card
) == power_state
)
990 set_current_state(TASK_UNINTERRUPTIBLE
);
991 snd_power_unlock(card
);
992 schedule_timeout(30 * HZ
);
993 snd_power_lock(card
);
995 remove_wait_queue(&card
->power_sleep
, &wait
);
999 EXPORT_SYMBOL(snd_power_wait
);
1000 #endif /* CONFIG_PM */