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 mutex_init(&card
->user_ctl_lock
);
236 INIT_LIST_HEAD(&card
->controls
);
237 INIT_LIST_HEAD(&card
->ctl_files
);
238 spin_lock_init(&card
->files_lock
);
239 INIT_LIST_HEAD(&card
->files_list
);
241 mutex_init(&card
->power_lock
);
242 init_waitqueue_head(&card
->power_sleep
);
245 device_initialize(&card
->card_dev
);
246 card
->card_dev
.parent
= parent
;
247 card
->card_dev
.class = sound_class
;
248 card
->card_dev
.release
= release_card_device
;
249 card
->card_dev
.groups
= card_dev_attr_groups
;
250 err
= kobject_set_name(&card
->card_dev
.kobj
, "card%d", idx
);
254 /* the control interface cannot be accessed from the user space until */
255 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
256 err
= snd_ctl_create(card
);
258 dev_err(parent
, "unable to register control minors\n");
261 err
= snd_info_card_create(card
);
263 dev_err(parent
, "unable to create card info\n");
270 snd_device_free_all(card
);
272 put_device(&card
->card_dev
);
275 EXPORT_SYMBOL(snd_card_new
);
277 /* return non-zero if a card is already locked */
278 int snd_card_locked(int card
)
282 mutex_lock(&snd_card_mutex
);
283 locked
= test_bit(card
, snd_cards_lock
);
284 mutex_unlock(&snd_card_mutex
);
288 static loff_t
snd_disconnect_llseek(struct file
*file
, loff_t offset
, int orig
)
293 static ssize_t
snd_disconnect_read(struct file
*file
, char __user
*buf
,
294 size_t count
, loff_t
*offset
)
299 static ssize_t
snd_disconnect_write(struct file
*file
, const char __user
*buf
,
300 size_t count
, loff_t
*offset
)
305 static int snd_disconnect_release(struct inode
*inode
, struct file
*file
)
307 struct snd_monitor_file
*df
= NULL
, *_df
;
309 spin_lock(&shutdown_lock
);
310 list_for_each_entry(_df
, &shutdown_files
, shutdown_list
) {
311 if (_df
->file
== file
) {
313 list_del_init(&df
->shutdown_list
);
317 spin_unlock(&shutdown_lock
);
320 if ((file
->f_flags
& FASYNC
) && df
->disconnected_f_op
->fasync
)
321 df
->disconnected_f_op
->fasync(-1, file
, 0);
322 return df
->disconnected_f_op
->release(inode
, file
);
325 panic("%s(%p, %p) failed!", __func__
, inode
, file
);
328 static unsigned int snd_disconnect_poll(struct file
* file
, poll_table
* wait
)
330 return POLLERR
| POLLNVAL
;
333 static long snd_disconnect_ioctl(struct file
*file
,
334 unsigned int cmd
, unsigned long arg
)
339 static int snd_disconnect_mmap(struct file
*file
, struct vm_area_struct
*vma
)
344 static int snd_disconnect_fasync(int fd
, struct file
*file
, int on
)
349 static const struct file_operations snd_shutdown_f_ops
=
351 .owner
= THIS_MODULE
,
352 .llseek
= snd_disconnect_llseek
,
353 .read
= snd_disconnect_read
,
354 .write
= snd_disconnect_write
,
355 .release
= snd_disconnect_release
,
356 .poll
= snd_disconnect_poll
,
357 .unlocked_ioctl
= snd_disconnect_ioctl
,
359 .compat_ioctl
= snd_disconnect_ioctl
,
361 .mmap
= snd_disconnect_mmap
,
362 .fasync
= snd_disconnect_fasync
366 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
367 * @card: soundcard structure
369 * Disconnects all APIs from the file-operations (user space).
371 * Return: Zero, otherwise a negative error code.
373 * Note: The current implementation replaces all active file->f_op with special
374 * dummy file operations (they do nothing except release).
376 int snd_card_disconnect(struct snd_card
*card
)
378 struct snd_monitor_file
*mfile
;
384 spin_lock(&card
->files_lock
);
385 if (card
->shutdown
) {
386 spin_unlock(&card
->files_lock
);
390 spin_unlock(&card
->files_lock
);
392 /* phase 1: disable fops (user space) operations for ALSA API */
393 mutex_lock(&snd_card_mutex
);
394 snd_cards
[card
->number
] = NULL
;
395 clear_bit(card
->number
, snd_cards_lock
);
396 mutex_unlock(&snd_card_mutex
);
398 /* phase 2: replace file->f_op with special dummy operations */
400 spin_lock(&card
->files_lock
);
401 list_for_each_entry(mfile
, &card
->files_list
, list
) {
402 /* it's critical part, use endless loop */
403 /* we have no room to fail */
404 mfile
->disconnected_f_op
= mfile
->file
->f_op
;
406 spin_lock(&shutdown_lock
);
407 list_add(&mfile
->shutdown_list
, &shutdown_files
);
408 spin_unlock(&shutdown_lock
);
410 mfile
->file
->f_op
= &snd_shutdown_f_ops
;
411 fops_get(mfile
->file
->f_op
);
413 spin_unlock(&card
->files_lock
);
415 /* phase 3: notify all connected devices about disconnection */
416 /* at this point, they cannot respond to any calls except release() */
418 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
419 if (snd_mixer_oss_notify_callback
)
420 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_DISCONNECT
);
423 /* notify all devices that we are disconnected */
424 err
= snd_device_disconnect_all(card
);
426 dev_err(card
->dev
, "not all devices for card %i can be disconnected\n", card
->number
);
428 snd_info_card_disconnect(card
);
429 if (card
->registered
) {
430 device_del(&card
->card_dev
);
431 card
->registered
= false;
434 wake_up(&card
->power_sleep
);
439 EXPORT_SYMBOL(snd_card_disconnect
);
441 static int snd_card_do_free(struct snd_card
*card
)
443 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
444 if (snd_mixer_oss_notify_callback
)
445 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_FREE
);
447 snd_device_free_all(card
);
448 if (card
->private_free
)
449 card
->private_free(card
);
450 snd_info_free_entry(card
->proc_id
);
451 if (snd_info_card_free(card
) < 0) {
452 dev_warn(card
->dev
, "unable to free card info\n");
453 /* Not fatal error */
455 if (card
->release_completion
)
456 complete(card
->release_completion
);
462 * snd_card_free_when_closed - Disconnect the card, free it later eventually
463 * @card: soundcard structure
465 * Unlike snd_card_free(), this function doesn't try to release the card
466 * resource immediately, but tries to disconnect at first. When the card
467 * is still in use, the function returns before freeing the resources.
468 * The card resources will be freed when the refcount gets to zero.
470 int snd_card_free_when_closed(struct snd_card
*card
)
472 int ret
= snd_card_disconnect(card
);
475 put_device(&card
->card_dev
);
478 EXPORT_SYMBOL(snd_card_free_when_closed
);
481 * snd_card_free - frees given soundcard structure
482 * @card: soundcard structure
484 * This function releases the soundcard structure and the all assigned
485 * devices automatically. That is, you don't have to release the devices
488 * This function waits until the all resources are properly released.
490 * Return: Zero. Frees all associated devices and frees the control
491 * interface associated to given soundcard.
493 int snd_card_free(struct snd_card
*card
)
495 struct completion released
;
498 init_completion(&released
);
499 card
->release_completion
= &released
;
500 ret
= snd_card_free_when_closed(card
);
503 /* wait, until all devices are ready for the free operation */
504 wait_for_completion(&released
);
507 EXPORT_SYMBOL(snd_card_free
);
509 /* retrieve the last word of shortname or longname */
510 static const char *retrieve_id_from_card_name(const char *name
)
512 const char *spos
= name
;
515 if (isspace(*name
) && isalnum(name
[1]))
522 /* return true if the given id string doesn't conflict any other card ids */
523 static bool card_id_ok(struct snd_card
*card
, const char *id
)
526 if (!snd_info_check_reserved_words(id
))
528 for (i
= 0; i
< snd_ecards_limit
; i
++) {
529 if (snd_cards
[i
] && snd_cards
[i
] != card
&&
530 !strcmp(snd_cards
[i
]->id
, id
))
536 /* copy to card->id only with valid letters from nid */
537 static void copy_valid_id_string(struct snd_card
*card
, const char *src
,
542 while (*nid
&& !isalnum(*nid
))
545 *id
++ = isalpha(*src
) ? *src
: 'D';
546 while (*nid
&& (size_t)(id
- card
->id
) < sizeof(card
->id
) - 1) {
554 /* Set card->id from the given string
555 * If the string conflicts with other ids, add a suffix to make it unique.
557 static void snd_card_set_id_no_lock(struct snd_card
*card
, const char *src
,
561 bool is_default
= false;
564 copy_valid_id_string(card
, src
, nid
);
568 /* use "Default" for obviously invalid strings
569 * ("card" conflicts with proc directories)
571 if (!*id
|| !strncmp(id
, "card", 4)) {
572 strcpy(id
, "Default");
577 for (loops
= 0; loops
< SNDRV_CARDS
; loops
++) {
579 char sfxstr
[5]; /* "_012" */
582 if (card_id_ok(card
, id
))
585 /* Add _XYZ suffix */
586 sprintf(sfxstr
, "_%X", loops
+ 1);
587 sfxlen
= strlen(sfxstr
);
588 if (len
+ sfxlen
>= sizeof(card
->id
))
589 spos
= id
+ sizeof(card
->id
) - sfxlen
- 1;
592 strcpy(spos
, sfxstr
);
594 /* fallback to the default id */
600 dev_err(card
->dev
, "unable to set card id (%s)\n", id
);
601 if (card
->proc_root
->name
)
602 strlcpy(card
->id
, card
->proc_root
->name
, sizeof(card
->id
));
606 * snd_card_set_id - set card identification name
607 * @card: soundcard structure
608 * @nid: new identification string
610 * This function sets the card identification and checks for name
613 void snd_card_set_id(struct snd_card
*card
, const char *nid
)
615 /* check if user specified own card->id */
616 if (card
->id
[0] != '\0')
618 mutex_lock(&snd_card_mutex
);
619 snd_card_set_id_no_lock(card
, nid
, nid
);
620 mutex_unlock(&snd_card_mutex
);
622 EXPORT_SYMBOL(snd_card_set_id
);
625 card_id_show_attr(struct device
*dev
,
626 struct device_attribute
*attr
, char *buf
)
628 struct snd_card
*card
= container_of(dev
, struct snd_card
, card_dev
);
629 return snprintf(buf
, PAGE_SIZE
, "%s\n", card
->id
);
633 card_id_store_attr(struct device
*dev
, struct device_attribute
*attr
,
634 const char *buf
, size_t count
)
636 struct snd_card
*card
= container_of(dev
, struct snd_card
, card_dev
);
637 char buf1
[sizeof(card
->id
)];
638 size_t copy
= count
> sizeof(card
->id
) - 1 ?
639 sizeof(card
->id
) - 1 : count
;
643 for (idx
= 0; idx
< copy
; idx
++) {
645 if (!isalnum(c
) && c
!= '_' && c
!= '-')
648 memcpy(buf1
, buf
, copy
);
650 mutex_lock(&snd_card_mutex
);
651 if (!card_id_ok(NULL
, buf1
)) {
652 mutex_unlock(&snd_card_mutex
);
655 strcpy(card
->id
, buf1
);
656 snd_info_card_id_change(card
);
657 mutex_unlock(&snd_card_mutex
);
662 static DEVICE_ATTR(id
, S_IRUGO
| S_IWUSR
, card_id_show_attr
, card_id_store_attr
);
665 card_number_show_attr(struct device
*dev
,
666 struct device_attribute
*attr
, char *buf
)
668 struct snd_card
*card
= container_of(dev
, struct snd_card
, card_dev
);
669 return snprintf(buf
, PAGE_SIZE
, "%i\n", card
->number
);
672 static DEVICE_ATTR(number
, S_IRUGO
, card_number_show_attr
, NULL
);
674 static struct attribute
*card_dev_attrs
[] = {
676 &dev_attr_number
.attr
,
680 static struct attribute_group card_dev_attr_group
= {
681 .attrs
= card_dev_attrs
,
684 static const struct attribute_group
*card_dev_attr_groups
[] = {
685 &card_dev_attr_group
,
690 * snd_card_register - register the soundcard
691 * @card: soundcard structure
693 * This function registers all the devices assigned to the soundcard.
694 * Until calling this, the ALSA control interface is blocked from the
695 * external accesses. Thus, you should call this function at the end
696 * of the initialization of the card.
698 * Return: Zero otherwise a negative error code if the registration failed.
700 int snd_card_register(struct snd_card
*card
)
704 if (snd_BUG_ON(!card
))
707 if (!card
->registered
) {
708 err
= device_add(&card
->card_dev
);
711 card
->registered
= true;
714 if ((err
= snd_device_register_all(card
)) < 0)
716 mutex_lock(&snd_card_mutex
);
717 if (snd_cards
[card
->number
]) {
718 /* already registered */
719 mutex_unlock(&snd_card_mutex
);
723 /* make a unique id name from the given string */
724 char tmpid
[sizeof(card
->id
)];
725 memcpy(tmpid
, card
->id
, sizeof(card
->id
));
726 snd_card_set_id_no_lock(card
, tmpid
, tmpid
);
728 /* create an id from either shortname or longname */
730 src
= *card
->shortname
? card
->shortname
: card
->longname
;
731 snd_card_set_id_no_lock(card
, src
,
732 retrieve_id_from_card_name(src
));
734 snd_cards
[card
->number
] = card
;
735 mutex_unlock(&snd_card_mutex
);
736 init_info_for_card(card
);
737 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
738 if (snd_mixer_oss_notify_callback
)
739 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_REGISTER
);
744 EXPORT_SYMBOL(snd_card_register
);
746 #ifdef CONFIG_PROC_FS
747 static struct snd_info_entry
*snd_card_info_entry
;
749 static void snd_card_info_read(struct snd_info_entry
*entry
,
750 struct snd_info_buffer
*buffer
)
753 struct snd_card
*card
;
755 for (idx
= count
= 0; idx
< SNDRV_CARDS
; idx
++) {
756 mutex_lock(&snd_card_mutex
);
757 if ((card
= snd_cards
[idx
]) != NULL
) {
759 snd_iprintf(buffer
, "%2i [%-15s]: %s - %s\n",
764 snd_iprintf(buffer
, " %s\n",
767 mutex_unlock(&snd_card_mutex
);
770 snd_iprintf(buffer
, "--- no soundcards ---\n");
773 #ifdef CONFIG_SND_OSSEMUL
775 void snd_card_info_read_oss(struct snd_info_buffer
*buffer
)
778 struct snd_card
*card
;
780 for (idx
= count
= 0; idx
< SNDRV_CARDS
; idx
++) {
781 mutex_lock(&snd_card_mutex
);
782 if ((card
= snd_cards
[idx
]) != NULL
) {
784 snd_iprintf(buffer
, "%s\n", card
->longname
);
786 mutex_unlock(&snd_card_mutex
);
789 snd_iprintf(buffer
, "--- no soundcards ---\n");
796 static struct snd_info_entry
*snd_card_module_info_entry
;
797 static void snd_card_module_info_read(struct snd_info_entry
*entry
,
798 struct snd_info_buffer
*buffer
)
801 struct snd_card
*card
;
803 for (idx
= 0; idx
< SNDRV_CARDS
; idx
++) {
804 mutex_lock(&snd_card_mutex
);
805 if ((card
= snd_cards
[idx
]) != NULL
)
806 snd_iprintf(buffer
, "%2i %s\n",
807 idx
, card
->module
->name
);
808 mutex_unlock(&snd_card_mutex
);
813 int __init
snd_card_info_init(void)
815 struct snd_info_entry
*entry
;
817 entry
= snd_info_create_module_entry(THIS_MODULE
, "cards", NULL
);
820 entry
->c
.text
.read
= snd_card_info_read
;
821 if (snd_info_register(entry
) < 0) {
822 snd_info_free_entry(entry
);
825 snd_card_info_entry
= entry
;
828 entry
= snd_info_create_module_entry(THIS_MODULE
, "modules", NULL
);
830 entry
->c
.text
.read
= snd_card_module_info_read
;
831 if (snd_info_register(entry
) < 0)
832 snd_info_free_entry(entry
);
834 snd_card_module_info_entry
= entry
;
841 int __exit
snd_card_info_done(void)
843 snd_info_free_entry(snd_card_info_entry
);
845 snd_info_free_entry(snd_card_module_info_entry
);
850 #endif /* CONFIG_PROC_FS */
853 * snd_component_add - add a component string
854 * @card: soundcard structure
855 * @component: the component id string
857 * This function adds the component id string to the supported list.
858 * The component can be referred from the alsa-lib.
860 * Return: Zero otherwise a negative error code.
863 int snd_component_add(struct snd_card
*card
, const char *component
)
866 int len
= strlen(component
);
868 ptr
= strstr(card
->components
, component
);
870 if (ptr
[len
] == '\0' || ptr
[len
] == ' ') /* already there */
873 if (strlen(card
->components
) + 1 + len
+ 1 > sizeof(card
->components
)) {
877 if (card
->components
[0] != '\0')
878 strcat(card
->components
, " ");
879 strcat(card
->components
, component
);
883 EXPORT_SYMBOL(snd_component_add
);
886 * snd_card_file_add - add the file to the file list of the card
887 * @card: soundcard structure
888 * @file: file pointer
890 * This function adds the file to the file linked-list of the card.
891 * This linked-list is used to keep tracking the connection state,
892 * and to avoid the release of busy resources by hotplug.
894 * Return: zero or a negative error code.
896 int snd_card_file_add(struct snd_card
*card
, struct file
*file
)
898 struct snd_monitor_file
*mfile
;
900 mfile
= kmalloc(sizeof(*mfile
), GFP_KERNEL
);
904 mfile
->disconnected_f_op
= NULL
;
905 INIT_LIST_HEAD(&mfile
->shutdown_list
);
906 spin_lock(&card
->files_lock
);
907 if (card
->shutdown
) {
908 spin_unlock(&card
->files_lock
);
912 list_add(&mfile
->list
, &card
->files_list
);
913 get_device(&card
->card_dev
);
914 spin_unlock(&card
->files_lock
);
918 EXPORT_SYMBOL(snd_card_file_add
);
921 * snd_card_file_remove - remove the file from the file list
922 * @card: soundcard structure
923 * @file: file pointer
925 * This function removes the file formerly added to the card via
926 * snd_card_file_add() function.
927 * If all files are removed and snd_card_free_when_closed() was
928 * called beforehand, it processes the pending release of
931 * Return: Zero or a negative error code.
933 int snd_card_file_remove(struct snd_card
*card
, struct file
*file
)
935 struct snd_monitor_file
*mfile
, *found
= NULL
;
937 spin_lock(&card
->files_lock
);
938 list_for_each_entry(mfile
, &card
->files_list
, list
) {
939 if (mfile
->file
== file
) {
940 list_del(&mfile
->list
);
941 spin_lock(&shutdown_lock
);
942 list_del(&mfile
->shutdown_list
);
943 spin_unlock(&shutdown_lock
);
944 if (mfile
->disconnected_f_op
)
945 fops_put(mfile
->disconnected_f_op
);
950 spin_unlock(&card
->files_lock
);
952 dev_err(card
->dev
, "card file remove problem (%p)\n", file
);
956 put_device(&card
->card_dev
);
960 EXPORT_SYMBOL(snd_card_file_remove
);
964 * snd_power_wait - wait until the power-state is changed.
965 * @card: soundcard structure
966 * @power_state: expected power state
968 * Waits until the power-state is changed.
970 * Return: Zero if successful, or a negative error code.
972 * Note: the power lock must be active before call.
974 int snd_power_wait(struct snd_card
*card
, unsigned int power_state
)
980 if (snd_power_get_state(card
) == power_state
)
982 init_waitqueue_entry(&wait
, current
);
983 add_wait_queue(&card
->power_sleep
, &wait
);
985 if (card
->shutdown
) {
989 if (snd_power_get_state(card
) == power_state
)
991 set_current_state(TASK_UNINTERRUPTIBLE
);
992 snd_power_unlock(card
);
993 schedule_timeout(30 * HZ
);
994 snd_power_lock(card
);
996 remove_wait_queue(&card
->power_sleep
, &wait
);
1000 EXPORT_SYMBOL(snd_power_wait
);
1001 #endif /* CONFIG_PM */