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_SND_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 int init_info_for_card(struct snd_card
*card
)
113 struct snd_info_entry
*entry
;
115 entry
= snd_info_create_card_entry(card
, "id", card
->proc_root
);
117 dev_dbg(card
->dev
, "unable to create card entry\n");
120 entry
->c
.text
.read
= snd_card_id_read
;
121 card
->proc_id
= entry
;
123 return snd_info_card_register(card
);
125 #else /* !CONFIG_SND_PROC_FS */
126 #define init_info_for_card(card)
129 static int check_empty_slot(struct module
*module
, int slot
)
131 return !slots
[slot
] || !*slots
[slot
];
134 /* return an empty slot number (>= 0) found in the given bitmask @mask.
135 * @mask == -1 == 0xffffffff means: take any free slot up to 32
136 * when no slot is available, return the original @mask as is.
138 static int get_slot_from_bitmask(int mask
, int (*check
)(struct module
*, int),
139 struct module
*module
)
143 for (slot
= 0; slot
< SNDRV_CARDS
; slot
++) {
144 if (slot
< 32 && !(mask
& (1U << slot
)))
146 if (!test_bit(slot
, snd_cards_lock
)) {
147 if (check(module
, slot
))
148 return slot
; /* found */
151 return mask
; /* unchanged */
154 /* the default release callback set in snd_device_initialize() below;
155 * this is just NOP for now, as almost all jobs are already done in
156 * dev_free callback of snd_device chain instead.
158 static void default_release(struct device
*dev
)
163 * snd_device_initialize - Initialize struct device for sound devices
164 * @dev: device to initialize
165 * @card: card to assign, optional
167 void snd_device_initialize(struct device
*dev
, struct snd_card
*card
)
169 device_initialize(dev
);
171 dev
->parent
= &card
->card_dev
;
172 dev
->class = sound_class
;
173 dev
->release
= default_release
;
175 EXPORT_SYMBOL_GPL(snd_device_initialize
);
177 static int snd_card_do_free(struct snd_card
*card
);
178 static const struct attribute_group card_dev_attr_group
;
180 static void release_card_device(struct device
*dev
)
182 snd_card_do_free(dev_to_snd_card(dev
));
186 * snd_card_new - create and initialize a soundcard structure
187 * @parent: the parent device object
188 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
189 * @xid: card identification (ASCII string)
190 * @module: top level module for locking
191 * @extra_size: allocate this extra size after the main soundcard structure
192 * @card_ret: the pointer to store the created card instance
194 * Creates and initializes a soundcard structure.
196 * The function allocates snd_card instance via kzalloc with the given
197 * space for the driver to use freely. The allocated struct is stored
198 * in the given card_ret pointer.
200 * Return: Zero if successful or a negative error code.
202 int snd_card_new(struct device
*parent
, int idx
, const char *xid
,
203 struct module
*module
, int extra_size
,
204 struct snd_card
**card_ret
)
206 struct snd_card
*card
;
209 if (snd_BUG_ON(!card_ret
))
215 card
= kzalloc(sizeof(*card
) + extra_size
, GFP_KERNEL
);
219 card
->private_data
= (char *)card
+ sizeof(struct snd_card
);
221 strlcpy(card
->id
, xid
, sizeof(card
->id
));
223 mutex_lock(&snd_card_mutex
);
224 if (idx
< 0) /* first check the matching module-name slot */
225 idx
= get_slot_from_bitmask(idx
, module_slot_match
, module
);
226 if (idx
< 0) /* if not matched, assign an empty slot */
227 idx
= get_slot_from_bitmask(idx
, check_empty_slot
, module
);
230 else if (idx
< snd_ecards_limit
) {
231 if (test_bit(idx
, snd_cards_lock
))
232 err
= -EBUSY
; /* invalid */
233 } else if (idx
>= SNDRV_CARDS
)
236 mutex_unlock(&snd_card_mutex
);
237 dev_err(parent
, "cannot find the slot for index %d (range 0-%i), error: %d\n",
238 idx
, snd_ecards_limit
- 1, err
);
242 set_bit(idx
, snd_cards_lock
); /* lock it */
243 if (idx
>= snd_ecards_limit
)
244 snd_ecards_limit
= idx
+ 1; /* increase the limit */
245 mutex_unlock(&snd_card_mutex
);
248 card
->module
= module
;
249 INIT_LIST_HEAD(&card
->devices
);
250 init_rwsem(&card
->controls_rwsem
);
251 rwlock_init(&card
->ctl_files_rwlock
);
252 mutex_init(&card
->user_ctl_lock
);
253 INIT_LIST_HEAD(&card
->controls
);
254 INIT_LIST_HEAD(&card
->ctl_files
);
255 spin_lock_init(&card
->files_lock
);
256 INIT_LIST_HEAD(&card
->files_list
);
258 mutex_init(&card
->power_lock
);
259 init_waitqueue_head(&card
->power_sleep
);
262 device_initialize(&card
->card_dev
);
263 card
->card_dev
.parent
= parent
;
264 card
->card_dev
.class = sound_class
;
265 card
->card_dev
.release
= release_card_device
;
266 card
->card_dev
.groups
= card
->dev_groups
;
267 card
->dev_groups
[0] = &card_dev_attr_group
;
268 err
= kobject_set_name(&card
->card_dev
.kobj
, "card%d", idx
);
272 /* the control interface cannot be accessed from the user space until */
273 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
274 err
= snd_ctl_create(card
);
276 dev_err(parent
, "unable to register control minors\n");
279 err
= snd_info_card_create(card
);
281 dev_err(parent
, "unable to create card info\n");
288 snd_device_free_all(card
);
290 put_device(&card
->card_dev
);
293 EXPORT_SYMBOL(snd_card_new
);
295 /* return non-zero if a card is already locked */
296 int snd_card_locked(int card
)
300 mutex_lock(&snd_card_mutex
);
301 locked
= test_bit(card
, snd_cards_lock
);
302 mutex_unlock(&snd_card_mutex
);
306 static loff_t
snd_disconnect_llseek(struct file
*file
, loff_t offset
, int orig
)
311 static ssize_t
snd_disconnect_read(struct file
*file
, char __user
*buf
,
312 size_t count
, loff_t
*offset
)
317 static ssize_t
snd_disconnect_write(struct file
*file
, const char __user
*buf
,
318 size_t count
, loff_t
*offset
)
323 static int snd_disconnect_release(struct inode
*inode
, struct file
*file
)
325 struct snd_monitor_file
*df
= NULL
, *_df
;
327 spin_lock(&shutdown_lock
);
328 list_for_each_entry(_df
, &shutdown_files
, shutdown_list
) {
329 if (_df
->file
== file
) {
331 list_del_init(&df
->shutdown_list
);
335 spin_unlock(&shutdown_lock
);
338 if ((file
->f_flags
& FASYNC
) && df
->disconnected_f_op
->fasync
)
339 df
->disconnected_f_op
->fasync(-1, file
, 0);
340 return df
->disconnected_f_op
->release(inode
, file
);
343 panic("%s(%p, %p) failed!", __func__
, inode
, file
);
346 static unsigned int snd_disconnect_poll(struct file
* file
, poll_table
* wait
)
348 return POLLERR
| POLLNVAL
;
351 static long snd_disconnect_ioctl(struct file
*file
,
352 unsigned int cmd
, unsigned long arg
)
357 static int snd_disconnect_mmap(struct file
*file
, struct vm_area_struct
*vma
)
362 static int snd_disconnect_fasync(int fd
, struct file
*file
, int on
)
367 static const struct file_operations snd_shutdown_f_ops
=
369 .owner
= THIS_MODULE
,
370 .llseek
= snd_disconnect_llseek
,
371 .read
= snd_disconnect_read
,
372 .write
= snd_disconnect_write
,
373 .release
= snd_disconnect_release
,
374 .poll
= snd_disconnect_poll
,
375 .unlocked_ioctl
= snd_disconnect_ioctl
,
377 .compat_ioctl
= snd_disconnect_ioctl
,
379 .mmap
= snd_disconnect_mmap
,
380 .fasync
= snd_disconnect_fasync
384 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
385 * @card: soundcard structure
387 * Disconnects all APIs from the file-operations (user space).
389 * Return: Zero, otherwise a negative error code.
391 * Note: The current implementation replaces all active file->f_op with special
392 * dummy file operations (they do nothing except release).
394 int snd_card_disconnect(struct snd_card
*card
)
396 struct snd_monitor_file
*mfile
;
401 spin_lock(&card
->files_lock
);
402 if (card
->shutdown
) {
403 spin_unlock(&card
->files_lock
);
407 spin_unlock(&card
->files_lock
);
409 /* phase 1: disable fops (user space) operations for ALSA API */
410 mutex_lock(&snd_card_mutex
);
411 snd_cards
[card
->number
] = NULL
;
412 clear_bit(card
->number
, snd_cards_lock
);
413 mutex_unlock(&snd_card_mutex
);
415 /* phase 2: replace file->f_op with special dummy operations */
417 spin_lock(&card
->files_lock
);
418 list_for_each_entry(mfile
, &card
->files_list
, list
) {
419 /* it's critical part, use endless loop */
420 /* we have no room to fail */
421 mfile
->disconnected_f_op
= mfile
->file
->f_op
;
423 spin_lock(&shutdown_lock
);
424 list_add(&mfile
->shutdown_list
, &shutdown_files
);
425 spin_unlock(&shutdown_lock
);
427 mfile
->file
->f_op
= &snd_shutdown_f_ops
;
428 fops_get(mfile
->file
->f_op
);
430 spin_unlock(&card
->files_lock
);
432 /* phase 3: notify all connected devices about disconnection */
433 /* at this point, they cannot respond to any calls except release() */
435 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
436 if (snd_mixer_oss_notify_callback
)
437 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_DISCONNECT
);
440 /* notify all devices that we are disconnected */
441 snd_device_disconnect_all(card
);
443 snd_info_card_disconnect(card
);
444 if (card
->registered
) {
445 device_del(&card
->card_dev
);
446 card
->registered
= false;
449 wake_up(&card
->power_sleep
);
454 EXPORT_SYMBOL(snd_card_disconnect
);
456 static int snd_card_do_free(struct snd_card
*card
)
458 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
459 if (snd_mixer_oss_notify_callback
)
460 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_FREE
);
462 snd_device_free_all(card
);
463 if (card
->private_free
)
464 card
->private_free(card
);
465 snd_info_free_entry(card
->proc_id
);
466 if (snd_info_card_free(card
) < 0) {
467 dev_warn(card
->dev
, "unable to free card info\n");
468 /* Not fatal error */
470 if (card
->release_completion
)
471 complete(card
->release_completion
);
477 * snd_card_free_when_closed - Disconnect the card, free it later eventually
478 * @card: soundcard structure
480 * Unlike snd_card_free(), this function doesn't try to release the card
481 * resource immediately, but tries to disconnect at first. When the card
482 * is still in use, the function returns before freeing the resources.
483 * The card resources will be freed when the refcount gets to zero.
485 int snd_card_free_when_closed(struct snd_card
*card
)
487 int ret
= snd_card_disconnect(card
);
490 put_device(&card
->card_dev
);
493 EXPORT_SYMBOL(snd_card_free_when_closed
);
496 * snd_card_free - frees given soundcard structure
497 * @card: soundcard structure
499 * This function releases the soundcard structure and the all assigned
500 * devices automatically. That is, you don't have to release the devices
503 * This function waits until the all resources are properly released.
505 * Return: Zero. Frees all associated devices and frees the control
506 * interface associated to given soundcard.
508 int snd_card_free(struct snd_card
*card
)
510 struct completion released
;
513 init_completion(&released
);
514 card
->release_completion
= &released
;
515 ret
= snd_card_free_when_closed(card
);
518 /* wait, until all devices are ready for the free operation */
519 wait_for_completion(&released
);
522 EXPORT_SYMBOL(snd_card_free
);
524 /* retrieve the last word of shortname or longname */
525 static const char *retrieve_id_from_card_name(const char *name
)
527 const char *spos
= name
;
530 if (isspace(*name
) && isalnum(name
[1]))
537 /* return true if the given id string doesn't conflict any other card ids */
538 static bool card_id_ok(struct snd_card
*card
, const char *id
)
541 if (!snd_info_check_reserved_words(id
))
543 for (i
= 0; i
< snd_ecards_limit
; i
++) {
544 if (snd_cards
[i
] && snd_cards
[i
] != card
&&
545 !strcmp(snd_cards
[i
]->id
, id
))
551 /* copy to card->id only with valid letters from nid */
552 static void copy_valid_id_string(struct snd_card
*card
, const char *src
,
557 while (*nid
&& !isalnum(*nid
))
560 *id
++ = isalpha(*src
) ? *src
: 'D';
561 while (*nid
&& (size_t)(id
- card
->id
) < sizeof(card
->id
) - 1) {
569 /* Set card->id from the given string
570 * If the string conflicts with other ids, add a suffix to make it unique.
572 static void snd_card_set_id_no_lock(struct snd_card
*card
, const char *src
,
576 bool is_default
= false;
579 copy_valid_id_string(card
, src
, nid
);
583 /* use "Default" for obviously invalid strings
584 * ("card" conflicts with proc directories)
586 if (!*id
|| !strncmp(id
, "card", 4)) {
587 strcpy(id
, "Default");
592 for (loops
= 0; loops
< SNDRV_CARDS
; loops
++) {
594 char sfxstr
[5]; /* "_012" */
597 if (card_id_ok(card
, id
))
600 /* Add _XYZ suffix */
601 sprintf(sfxstr
, "_%X", loops
+ 1);
602 sfxlen
= strlen(sfxstr
);
603 if (len
+ sfxlen
>= sizeof(card
->id
))
604 spos
= id
+ sizeof(card
->id
) - sfxlen
- 1;
607 strcpy(spos
, sfxstr
);
609 /* fallback to the default id */
615 dev_err(card
->dev
, "unable to set card id (%s)\n", id
);
616 if (card
->proc_root
->name
)
617 strlcpy(card
->id
, card
->proc_root
->name
, sizeof(card
->id
));
621 * snd_card_set_id - set card identification name
622 * @card: soundcard structure
623 * @nid: new identification string
625 * This function sets the card identification and checks for name
628 void snd_card_set_id(struct snd_card
*card
, const char *nid
)
630 /* check if user specified own card->id */
631 if (card
->id
[0] != '\0')
633 mutex_lock(&snd_card_mutex
);
634 snd_card_set_id_no_lock(card
, nid
, nid
);
635 mutex_unlock(&snd_card_mutex
);
637 EXPORT_SYMBOL(snd_card_set_id
);
640 card_id_show_attr(struct device
*dev
,
641 struct device_attribute
*attr
, char *buf
)
643 struct snd_card
*card
= container_of(dev
, struct snd_card
, card_dev
);
644 return snprintf(buf
, PAGE_SIZE
, "%s\n", card
->id
);
648 card_id_store_attr(struct device
*dev
, struct device_attribute
*attr
,
649 const char *buf
, size_t count
)
651 struct snd_card
*card
= container_of(dev
, struct snd_card
, card_dev
);
652 char buf1
[sizeof(card
->id
)];
653 size_t copy
= count
> sizeof(card
->id
) - 1 ?
654 sizeof(card
->id
) - 1 : count
;
658 for (idx
= 0; idx
< copy
; idx
++) {
660 if (!isalnum(c
) && c
!= '_' && c
!= '-')
663 memcpy(buf1
, buf
, copy
);
665 mutex_lock(&snd_card_mutex
);
666 if (!card_id_ok(NULL
, buf1
)) {
667 mutex_unlock(&snd_card_mutex
);
670 strcpy(card
->id
, buf1
);
671 snd_info_card_id_change(card
);
672 mutex_unlock(&snd_card_mutex
);
677 static DEVICE_ATTR(id
, S_IRUGO
| S_IWUSR
, card_id_show_attr
, card_id_store_attr
);
680 card_number_show_attr(struct device
*dev
,
681 struct device_attribute
*attr
, char *buf
)
683 struct snd_card
*card
= container_of(dev
, struct snd_card
, card_dev
);
684 return snprintf(buf
, PAGE_SIZE
, "%i\n", card
->number
);
687 static DEVICE_ATTR(number
, S_IRUGO
, card_number_show_attr
, NULL
);
689 static struct attribute
*card_dev_attrs
[] = {
691 &dev_attr_number
.attr
,
695 static const struct attribute_group card_dev_attr_group
= {
696 .attrs
= card_dev_attrs
,
700 * snd_card_add_dev_attr - Append a new sysfs attribute group to card
701 * @card: card instance
702 * @group: attribute group to append
704 int snd_card_add_dev_attr(struct snd_card
*card
,
705 const struct attribute_group
*group
)
709 /* loop for (arraysize-1) here to keep NULL at the last entry */
710 for (i
= 0; i
< ARRAY_SIZE(card
->dev_groups
) - 1; i
++) {
711 if (!card
->dev_groups
[i
]) {
712 card
->dev_groups
[i
] = group
;
717 dev_err(card
->dev
, "Too many groups assigned\n");
720 EXPORT_SYMBOL_GPL(snd_card_add_dev_attr
);
723 * snd_card_register - register the soundcard
724 * @card: soundcard structure
726 * This function registers all the devices assigned to the soundcard.
727 * Until calling this, the ALSA control interface is blocked from the
728 * external accesses. Thus, you should call this function at the end
729 * of the initialization of the card.
731 * Return: Zero otherwise a negative error code if the registration failed.
733 int snd_card_register(struct snd_card
*card
)
737 if (snd_BUG_ON(!card
))
740 if (!card
->registered
) {
741 err
= device_add(&card
->card_dev
);
744 card
->registered
= true;
747 if ((err
= snd_device_register_all(card
)) < 0)
749 mutex_lock(&snd_card_mutex
);
750 if (snd_cards
[card
->number
]) {
751 /* already registered */
752 mutex_unlock(&snd_card_mutex
);
753 return snd_info_card_register(card
); /* register pending info */
756 /* make a unique id name from the given string */
757 char tmpid
[sizeof(card
->id
)];
758 memcpy(tmpid
, card
->id
, sizeof(card
->id
));
759 snd_card_set_id_no_lock(card
, tmpid
, tmpid
);
761 /* create an id from either shortname or longname */
763 src
= *card
->shortname
? card
->shortname
: card
->longname
;
764 snd_card_set_id_no_lock(card
, src
,
765 retrieve_id_from_card_name(src
));
767 snd_cards
[card
->number
] = card
;
768 mutex_unlock(&snd_card_mutex
);
769 init_info_for_card(card
);
770 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
771 if (snd_mixer_oss_notify_callback
)
772 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_REGISTER
);
777 EXPORT_SYMBOL(snd_card_register
);
779 #ifdef CONFIG_SND_PROC_FS
780 static void snd_card_info_read(struct snd_info_entry
*entry
,
781 struct snd_info_buffer
*buffer
)
784 struct snd_card
*card
;
786 for (idx
= count
= 0; idx
< SNDRV_CARDS
; idx
++) {
787 mutex_lock(&snd_card_mutex
);
788 if ((card
= snd_cards
[idx
]) != NULL
) {
790 snd_iprintf(buffer
, "%2i [%-15s]: %s - %s\n",
795 snd_iprintf(buffer
, " %s\n",
798 mutex_unlock(&snd_card_mutex
);
801 snd_iprintf(buffer
, "--- no soundcards ---\n");
804 #ifdef CONFIG_SND_OSSEMUL
805 void snd_card_info_read_oss(struct snd_info_buffer
*buffer
)
808 struct snd_card
*card
;
810 for (idx
= count
= 0; idx
< SNDRV_CARDS
; idx
++) {
811 mutex_lock(&snd_card_mutex
);
812 if ((card
= snd_cards
[idx
]) != NULL
) {
814 snd_iprintf(buffer
, "%s\n", card
->longname
);
816 mutex_unlock(&snd_card_mutex
);
819 snd_iprintf(buffer
, "--- no soundcards ---\n");
826 static void snd_card_module_info_read(struct snd_info_entry
*entry
,
827 struct snd_info_buffer
*buffer
)
830 struct snd_card
*card
;
832 for (idx
= 0; idx
< SNDRV_CARDS
; idx
++) {
833 mutex_lock(&snd_card_mutex
);
834 if ((card
= snd_cards
[idx
]) != NULL
)
835 snd_iprintf(buffer
, "%2i %s\n",
836 idx
, card
->module
->name
);
837 mutex_unlock(&snd_card_mutex
);
842 int __init
snd_card_info_init(void)
844 struct snd_info_entry
*entry
;
846 entry
= snd_info_create_module_entry(THIS_MODULE
, "cards", NULL
);
849 entry
->c
.text
.read
= snd_card_info_read
;
850 if (snd_info_register(entry
) < 0)
851 return -ENOMEM
; /* freed in error path */
854 entry
= snd_info_create_module_entry(THIS_MODULE
, "modules", NULL
);
857 entry
->c
.text
.read
= snd_card_module_info_read
;
858 if (snd_info_register(entry
) < 0)
859 return -ENOMEM
; /* freed in error path */
864 #endif /* CONFIG_SND_PROC_FS */
867 * snd_component_add - add a component string
868 * @card: soundcard structure
869 * @component: the component id string
871 * This function adds the component id string to the supported list.
872 * The component can be referred from the alsa-lib.
874 * Return: Zero otherwise a negative error code.
877 int snd_component_add(struct snd_card
*card
, const char *component
)
880 int len
= strlen(component
);
882 ptr
= strstr(card
->components
, component
);
884 if (ptr
[len
] == '\0' || ptr
[len
] == ' ') /* already there */
887 if (strlen(card
->components
) + 1 + len
+ 1 > sizeof(card
->components
)) {
891 if (card
->components
[0] != '\0')
892 strcat(card
->components
, " ");
893 strcat(card
->components
, component
);
897 EXPORT_SYMBOL(snd_component_add
);
900 * snd_card_file_add - add the file to the file list of the card
901 * @card: soundcard structure
902 * @file: file pointer
904 * This function adds the file to the file linked-list of the card.
905 * This linked-list is used to keep tracking the connection state,
906 * and to avoid the release of busy resources by hotplug.
908 * Return: zero or a negative error code.
910 int snd_card_file_add(struct snd_card
*card
, struct file
*file
)
912 struct snd_monitor_file
*mfile
;
914 mfile
= kmalloc(sizeof(*mfile
), GFP_KERNEL
);
918 mfile
->disconnected_f_op
= NULL
;
919 INIT_LIST_HEAD(&mfile
->shutdown_list
);
920 spin_lock(&card
->files_lock
);
921 if (card
->shutdown
) {
922 spin_unlock(&card
->files_lock
);
926 list_add(&mfile
->list
, &card
->files_list
);
927 get_device(&card
->card_dev
);
928 spin_unlock(&card
->files_lock
);
932 EXPORT_SYMBOL(snd_card_file_add
);
935 * snd_card_file_remove - remove the file from the file list
936 * @card: soundcard structure
937 * @file: file pointer
939 * This function removes the file formerly added to the card via
940 * snd_card_file_add() function.
941 * If all files are removed and snd_card_free_when_closed() was
942 * called beforehand, it processes the pending release of
945 * Return: Zero or a negative error code.
947 int snd_card_file_remove(struct snd_card
*card
, struct file
*file
)
949 struct snd_monitor_file
*mfile
, *found
= NULL
;
951 spin_lock(&card
->files_lock
);
952 list_for_each_entry(mfile
, &card
->files_list
, list
) {
953 if (mfile
->file
== file
) {
954 list_del(&mfile
->list
);
955 spin_lock(&shutdown_lock
);
956 list_del(&mfile
->shutdown_list
);
957 spin_unlock(&shutdown_lock
);
958 if (mfile
->disconnected_f_op
)
959 fops_put(mfile
->disconnected_f_op
);
964 spin_unlock(&card
->files_lock
);
966 dev_err(card
->dev
, "card file remove problem (%p)\n", file
);
970 put_device(&card
->card_dev
);
974 EXPORT_SYMBOL(snd_card_file_remove
);
978 * snd_power_wait - wait until the power-state is changed.
979 * @card: soundcard structure
980 * @power_state: expected power state
982 * Waits until the power-state is changed.
984 * Return: Zero if successful, or a negative error code.
986 * Note: the power lock must be active before call.
988 int snd_power_wait(struct snd_card
*card
, unsigned int power_state
)
994 if (snd_power_get_state(card
) == power_state
)
996 init_waitqueue_entry(&wait
, current
);
997 add_wait_queue(&card
->power_sleep
, &wait
);
999 if (card
->shutdown
) {
1003 if (snd_power_get_state(card
) == power_state
)
1005 set_current_state(TASK_UNINTERRUPTIBLE
);
1006 snd_power_unlock(card
);
1007 schedule_timeout(30 * HZ
);
1008 snd_power_lock(card
);
1010 remove_wait_queue(&card
->power_sleep
, &wait
);
1014 EXPORT_SYMBOL(snd_power_wait
);
1015 #endif /* CONFIG_PM */