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>
32 #include <sound/core.h>
33 #include <sound/control.h>
34 #include <sound/info.h>
36 /* monitor files for graceful shutdown (hotplug) */
37 struct snd_monitor_file
{
39 const struct file_operations
*disconnected_f_op
;
40 struct list_head shutdown_list
; /* still need to shutdown */
41 struct list_head list
; /* link of monitor files */
44 static DEFINE_SPINLOCK(shutdown_lock
);
45 static LIST_HEAD(shutdown_files
);
47 static const struct file_operations snd_shutdown_f_ops
;
49 /* locked for registering/using */
50 static DECLARE_BITMAP(snd_cards_lock
, SNDRV_CARDS
);
51 struct snd_card
*snd_cards
[SNDRV_CARDS
];
52 EXPORT_SYMBOL(snd_cards
);
54 static DEFINE_MUTEX(snd_card_mutex
);
56 static char *slots
[SNDRV_CARDS
];
57 module_param_array(slots
, charp
, NULL
, 0444);
58 MODULE_PARM_DESC(slots
, "Module names assigned to the slots.");
60 /* return non-zero if the given index is reserved for the given
61 * module via slots option
63 static int module_slot_match(struct module
*module
, int idx
)
69 if (!module
|| !*module
->name
|| !slots
[idx
])
75 match
= 0; /* negative match */
78 /* compare module name strings
79 * hyphens are handled as equivalent with underscore
97 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
98 int (*snd_mixer_oss_notify_callback
)(struct snd_card
*card
, int free_flag
);
99 EXPORT_SYMBOL(snd_mixer_oss_notify_callback
);
102 #ifdef CONFIG_PROC_FS
103 static void snd_card_id_read(struct snd_info_entry
*entry
,
104 struct snd_info_buffer
*buffer
)
106 snd_iprintf(buffer
, "%s\n", entry
->card
->id
);
109 static inline int init_info_for_card(struct snd_card
*card
)
112 struct snd_info_entry
*entry
;
114 if ((err
= snd_info_card_register(card
)) < 0) {
115 snd_printd("unable to create card info\n");
118 if ((entry
= snd_info_create_card_entry(card
, "id", card
->proc_root
)) == NULL
) {
119 snd_printd("unable to create card entry\n");
122 entry
->c
.text
.read
= snd_card_id_read
;
123 if (snd_info_register(entry
) < 0) {
124 snd_info_free_entry(entry
);
127 card
->proc_id
= entry
;
130 #else /* !CONFIG_PROC_FS */
131 #define init_info_for_card(card)
134 static int check_empty_slot(struct module
*module
, int slot
)
136 return !slots
[slot
] || !*slots
[slot
];
139 /* return an empty slot number (>= 0) found in the given bitmask @mask.
140 * @mask == -1 == 0xffffffff means: take any free slot up to 32
141 * when no slot is available, return the original @mask as is.
143 static int get_slot_from_bitmask(int mask
, int (*check
)(struct module
*, int),
144 struct module
*module
)
148 for (slot
= 0; slot
< SNDRV_CARDS
; slot
++) {
149 if (slot
< 32 && !(mask
& (1U << slot
)))
151 if (!test_bit(slot
, snd_cards_lock
)) {
152 if (check(module
, slot
))
153 return slot
; /* found */
156 return mask
; /* unchanged */
160 * snd_card_create - create and initialize a soundcard structure
161 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
162 * @xid: card identification (ASCII string)
163 * @module: top level module for locking
164 * @extra_size: allocate this extra size after the main soundcard structure
165 * @card_ret: the pointer to store the created card instance
167 * Creates and initializes a soundcard structure.
169 * The function allocates snd_card instance via kzalloc with the given
170 * space for the driver to use freely. The allocated struct is stored
171 * in the given card_ret pointer.
173 * Return: Zero if successful or a negative error code.
175 int snd_card_create(int idx
, const char *xid
,
176 struct module
*module
, int extra_size
,
177 struct snd_card
**card_ret
)
179 struct snd_card
*card
;
182 if (snd_BUG_ON(!card_ret
))
188 card
= kzalloc(sizeof(*card
) + extra_size
, GFP_KERNEL
);
192 strlcpy(card
->id
, xid
, sizeof(card
->id
));
194 mutex_lock(&snd_card_mutex
);
195 if (idx
< 0) /* first check the matching module-name slot */
196 idx
= get_slot_from_bitmask(idx
, module_slot_match
, module
);
197 if (idx
< 0) /* if not matched, assign an empty slot */
198 idx
= get_slot_from_bitmask(idx
, check_empty_slot
, module
);
201 else if (idx
< snd_ecards_limit
) {
202 if (test_bit(idx
, snd_cards_lock
))
203 err
= -EBUSY
; /* invalid */
204 } else if (idx
>= SNDRV_CARDS
)
207 mutex_unlock(&snd_card_mutex
);
208 snd_printk(KERN_ERR
"cannot find the slot for index %d (range 0-%i), error: %d\n",
209 idx
, snd_ecards_limit
- 1, err
);
212 set_bit(idx
, snd_cards_lock
); /* lock it */
213 if (idx
>= snd_ecards_limit
)
214 snd_ecards_limit
= idx
+ 1; /* increase the limit */
215 mutex_unlock(&snd_card_mutex
);
217 card
->module
= module
;
218 INIT_LIST_HEAD(&card
->devices
);
219 init_rwsem(&card
->controls_rwsem
);
220 rwlock_init(&card
->ctl_files_rwlock
);
221 INIT_LIST_HEAD(&card
->controls
);
222 INIT_LIST_HEAD(&card
->ctl_files
);
223 spin_lock_init(&card
->files_lock
);
224 INIT_LIST_HEAD(&card
->files_list
);
225 init_waitqueue_head(&card
->shutdown_sleep
);
226 atomic_set(&card
->refcount
, 0);
228 mutex_init(&card
->power_lock
);
229 init_waitqueue_head(&card
->power_sleep
);
231 /* the control interface cannot be accessed from the user space until */
232 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
233 err
= snd_ctl_create(card
);
235 snd_printk(KERN_ERR
"unable to register control minors\n");
238 err
= snd_info_card_create(card
);
240 snd_printk(KERN_ERR
"unable to create card info\n");
244 card
->private_data
= (char *)card
+ sizeof(struct snd_card
);
249 snd_device_free_all(card
, SNDRV_DEV_CMD_PRE
);
254 EXPORT_SYMBOL(snd_card_create
);
256 /* return non-zero if a card is already locked */
257 int snd_card_locked(int card
)
261 mutex_lock(&snd_card_mutex
);
262 locked
= test_bit(card
, snd_cards_lock
);
263 mutex_unlock(&snd_card_mutex
);
267 static loff_t
snd_disconnect_llseek(struct file
*file
, loff_t offset
, int orig
)
272 static ssize_t
snd_disconnect_read(struct file
*file
, char __user
*buf
,
273 size_t count
, loff_t
*offset
)
278 static ssize_t
snd_disconnect_write(struct file
*file
, const char __user
*buf
,
279 size_t count
, loff_t
*offset
)
284 static int snd_disconnect_release(struct inode
*inode
, struct file
*file
)
286 struct snd_monitor_file
*df
= NULL
, *_df
;
288 spin_lock(&shutdown_lock
);
289 list_for_each_entry(_df
, &shutdown_files
, shutdown_list
) {
290 if (_df
->file
== file
) {
292 list_del_init(&df
->shutdown_list
);
296 spin_unlock(&shutdown_lock
);
299 if ((file
->f_flags
& FASYNC
) && df
->disconnected_f_op
->fasync
)
300 df
->disconnected_f_op
->fasync(-1, file
, 0);
301 return df
->disconnected_f_op
->release(inode
, file
);
304 panic("%s(%p, %p) failed!", __func__
, inode
, file
);
307 static unsigned int snd_disconnect_poll(struct file
* file
, poll_table
* wait
)
309 return POLLERR
| POLLNVAL
;
312 static long snd_disconnect_ioctl(struct file
*file
,
313 unsigned int cmd
, unsigned long arg
)
318 static int snd_disconnect_mmap(struct file
*file
, struct vm_area_struct
*vma
)
323 static int snd_disconnect_fasync(int fd
, struct file
*file
, int on
)
328 static const struct file_operations snd_shutdown_f_ops
=
330 .owner
= THIS_MODULE
,
331 .llseek
= snd_disconnect_llseek
,
332 .read
= snd_disconnect_read
,
333 .write
= snd_disconnect_write
,
334 .release
= snd_disconnect_release
,
335 .poll
= snd_disconnect_poll
,
336 .unlocked_ioctl
= snd_disconnect_ioctl
,
338 .compat_ioctl
= snd_disconnect_ioctl
,
340 .mmap
= snd_disconnect_mmap
,
341 .fasync
= snd_disconnect_fasync
345 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
346 * @card: soundcard structure
348 * Disconnects all APIs from the file-operations (user space).
350 * Return: Zero, otherwise a negative error code.
352 * Note: The current implementation replaces all active file->f_op with special
353 * dummy file operations (they do nothing except release).
355 int snd_card_disconnect(struct snd_card
*card
)
357 struct snd_monitor_file
*mfile
;
363 spin_lock(&card
->files_lock
);
364 if (card
->shutdown
) {
365 spin_unlock(&card
->files_lock
);
369 spin_unlock(&card
->files_lock
);
371 /* phase 1: disable fops (user space) operations for ALSA API */
372 mutex_lock(&snd_card_mutex
);
373 snd_cards
[card
->number
] = NULL
;
374 clear_bit(card
->number
, snd_cards_lock
);
375 mutex_unlock(&snd_card_mutex
);
377 /* phase 2: replace file->f_op with special dummy operations */
379 spin_lock(&card
->files_lock
);
380 list_for_each_entry(mfile
, &card
->files_list
, list
) {
381 /* it's critical part, use endless loop */
382 /* we have no room to fail */
383 mfile
->disconnected_f_op
= mfile
->file
->f_op
;
385 spin_lock(&shutdown_lock
);
386 list_add(&mfile
->shutdown_list
, &shutdown_files
);
387 spin_unlock(&shutdown_lock
);
389 mfile
->file
->f_op
= &snd_shutdown_f_ops
;
390 fops_get(mfile
->file
->f_op
);
392 spin_unlock(&card
->files_lock
);
394 /* phase 3: notify all connected devices about disconnection */
395 /* at this point, they cannot respond to any calls except release() */
397 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
398 if (snd_mixer_oss_notify_callback
)
399 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_DISCONNECT
);
402 /* notify all devices that we are disconnected */
403 err
= snd_device_disconnect_all(card
);
405 snd_printk(KERN_ERR
"not all devices for card %i can be disconnected\n", card
->number
);
407 snd_info_card_disconnect(card
);
408 if (card
->card_dev
) {
409 device_unregister(card
->card_dev
);
410 card
->card_dev
= NULL
;
413 wake_up(&card
->power_sleep
);
418 EXPORT_SYMBOL(snd_card_disconnect
);
421 * snd_card_free - frees given soundcard structure
422 * @card: soundcard structure
424 * This function releases the soundcard structure and the all assigned
425 * devices automatically. That is, you don't have to release the devices
428 * Return: Zero. Frees all associated devices and frees the control
429 * interface associated to given soundcard.
431 static int snd_card_do_free(struct snd_card
*card
)
433 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
434 if (snd_mixer_oss_notify_callback
)
435 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_FREE
);
437 if (snd_device_free_all(card
, SNDRV_DEV_CMD_PRE
) < 0) {
438 snd_printk(KERN_ERR
"unable to free all devices (pre)\n");
439 /* Fatal, but this situation should never occur */
441 if (snd_device_free_all(card
, SNDRV_DEV_CMD_NORMAL
) < 0) {
442 snd_printk(KERN_ERR
"unable to free all devices (normal)\n");
443 /* Fatal, but this situation should never occur */
445 if (snd_device_free_all(card
, SNDRV_DEV_CMD_POST
) < 0) {
446 snd_printk(KERN_ERR
"unable to free all devices (post)\n");
447 /* Fatal, but this situation should never occur */
449 if (card
->private_free
)
450 card
->private_free(card
);
451 snd_info_free_entry(card
->proc_id
);
452 if (snd_info_card_free(card
) < 0) {
453 snd_printk(KERN_WARNING
"unable to free card info\n");
454 /* Not fatal error */
461 * snd_card_unref - release the reference counter
462 * @card: the card instance
464 * Decrements the reference counter. When it reaches to zero, wake up
465 * the sleeper and call the destructor if needed.
467 void snd_card_unref(struct snd_card
*card
)
469 if (atomic_dec_and_test(&card
->refcount
)) {
470 wake_up(&card
->shutdown_sleep
);
471 if (card
->free_on_last_close
)
472 snd_card_do_free(card
);
475 EXPORT_SYMBOL(snd_card_unref
);
477 int snd_card_free_when_closed(struct snd_card
*card
)
481 atomic_inc(&card
->refcount
);
482 ret
= snd_card_disconnect(card
);
484 atomic_dec(&card
->refcount
);
488 card
->free_on_last_close
= 1;
489 if (atomic_dec_and_test(&card
->refcount
))
490 snd_card_do_free(card
);
494 EXPORT_SYMBOL(snd_card_free_when_closed
);
496 int snd_card_free(struct snd_card
*card
)
498 int ret
= snd_card_disconnect(card
);
502 /* wait, until all devices are ready for the free operation */
503 wait_event(card
->shutdown_sleep
, !atomic_read(&card
->refcount
));
504 snd_card_do_free(card
);
508 EXPORT_SYMBOL(snd_card_free
);
510 /* retrieve the last word of shortname or longname */
511 static const char *retrieve_id_from_card_name(const char *name
)
513 const char *spos
= name
;
516 if (isspace(*name
) && isalnum(name
[1]))
523 /* return true if the given id string doesn't conflict any other card ids */
524 static bool card_id_ok(struct snd_card
*card
, const char *id
)
527 if (!snd_info_check_reserved_words(id
))
529 for (i
= 0; i
< snd_ecards_limit
; i
++) {
530 if (snd_cards
[i
] && snd_cards
[i
] != card
&&
531 !strcmp(snd_cards
[i
]->id
, id
))
537 /* copy to card->id only with valid letters from nid */
538 static void copy_valid_id_string(struct snd_card
*card
, const char *src
,
543 while (*nid
&& !isalnum(*nid
))
546 *id
++ = isalpha(*src
) ? *src
: 'D';
547 while (*nid
&& (size_t)(id
- card
->id
) < sizeof(card
->id
) - 1) {
555 /* Set card->id from the given string
556 * If the string conflicts with other ids, add a suffix to make it unique.
558 static void snd_card_set_id_no_lock(struct snd_card
*card
, const char *src
,
562 bool is_default
= false;
565 copy_valid_id_string(card
, src
, nid
);
569 /* use "Default" for obviously invalid strings
570 * ("card" conflicts with proc directories)
572 if (!*id
|| !strncmp(id
, "card", 4)) {
573 strcpy(id
, "Default");
578 for (loops
= 0; loops
< SNDRV_CARDS
; loops
++) {
580 char sfxstr
[5]; /* "_012" */
583 if (card_id_ok(card
, id
))
586 /* Add _XYZ suffix */
587 sprintf(sfxstr
, "_%X", loops
+ 1);
588 sfxlen
= strlen(sfxstr
);
589 if (len
+ sfxlen
>= sizeof(card
->id
))
590 spos
= id
+ sizeof(card
->id
) - sfxlen
- 1;
593 strcpy(spos
, sfxstr
);
595 /* fallback to the default id */
601 snd_printk(KERN_ERR
"unable to set card id (%s)\n", id
);
602 if (card
->proc_root
->name
)
603 strlcpy(card
->id
, card
->proc_root
->name
, sizeof(card
->id
));
607 * snd_card_set_id - set card identification name
608 * @card: soundcard structure
609 * @nid: new identification string
611 * This function sets the card identification and checks for name
614 void snd_card_set_id(struct snd_card
*card
, const char *nid
)
616 /* check if user specified own card->id */
617 if (card
->id
[0] != '\0')
619 mutex_lock(&snd_card_mutex
);
620 snd_card_set_id_no_lock(card
, nid
, nid
);
621 mutex_unlock(&snd_card_mutex
);
623 EXPORT_SYMBOL(snd_card_set_id
);
626 card_id_show_attr(struct device
*dev
,
627 struct device_attribute
*attr
, char *buf
)
629 struct snd_card
*card
= dev_get_drvdata(dev
);
630 return snprintf(buf
, PAGE_SIZE
, "%s\n", card
? card
->id
: "(null)");
634 card_id_store_attr(struct device
*dev
, struct device_attribute
*attr
,
635 const char *buf
, size_t count
)
637 struct snd_card
*card
= dev_get_drvdata(dev
);
638 char buf1
[sizeof(card
->id
)];
639 size_t copy
= count
> sizeof(card
->id
) - 1 ?
640 sizeof(card
->id
) - 1 : count
;
644 for (idx
= 0; idx
< copy
; idx
++) {
646 if (!isalnum(c
) && c
!= '_' && c
!= '-')
649 memcpy(buf1
, buf
, copy
);
651 mutex_lock(&snd_card_mutex
);
652 if (!card_id_ok(NULL
, buf1
)) {
653 mutex_unlock(&snd_card_mutex
);
656 strcpy(card
->id
, buf1
);
657 snd_info_card_id_change(card
);
658 mutex_unlock(&snd_card_mutex
);
663 static struct device_attribute card_id_attrs
=
664 __ATTR(id
, S_IRUGO
| S_IWUSR
, card_id_show_attr
, card_id_store_attr
);
667 card_number_show_attr(struct device
*dev
,
668 struct device_attribute
*attr
, char *buf
)
670 struct snd_card
*card
= dev_get_drvdata(dev
);
671 return snprintf(buf
, PAGE_SIZE
, "%i\n", card
? card
->number
: -1);
674 static struct device_attribute card_number_attrs
=
675 __ATTR(number
, S_IRUGO
, card_number_show_attr
, NULL
);
678 * snd_card_register - register the soundcard
679 * @card: soundcard structure
681 * This function registers all the devices assigned to the soundcard.
682 * Until calling this, the ALSA control interface is blocked from the
683 * external accesses. Thus, you should call this function at the end
684 * of the initialization of the card.
686 * Return: Zero otherwise a negative error code if the registration failed.
688 int snd_card_register(struct snd_card
*card
)
692 if (snd_BUG_ON(!card
))
695 if (!card
->card_dev
) {
696 card
->card_dev
= device_create(sound_class
, card
->dev
,
698 "card%i", card
->number
);
699 if (IS_ERR(card
->card_dev
))
700 card
->card_dev
= NULL
;
703 if ((err
= snd_device_register_all(card
)) < 0)
705 mutex_lock(&snd_card_mutex
);
706 if (snd_cards
[card
->number
]) {
707 /* already registered */
708 mutex_unlock(&snd_card_mutex
);
712 /* make a unique id name from the given string */
713 char tmpid
[sizeof(card
->id
)];
714 memcpy(tmpid
, card
->id
, sizeof(card
->id
));
715 snd_card_set_id_no_lock(card
, tmpid
, tmpid
);
717 /* create an id from either shortname or longname */
719 src
= *card
->shortname
? card
->shortname
: card
->longname
;
720 snd_card_set_id_no_lock(card
, src
,
721 retrieve_id_from_card_name(src
));
723 snd_cards
[card
->number
] = card
;
724 mutex_unlock(&snd_card_mutex
);
725 init_info_for_card(card
);
726 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
727 if (snd_mixer_oss_notify_callback
)
728 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_REGISTER
);
730 if (card
->card_dev
) {
731 err
= device_create_file(card
->card_dev
, &card_id_attrs
);
734 err
= device_create_file(card
->card_dev
, &card_number_attrs
);
742 EXPORT_SYMBOL(snd_card_register
);
744 #ifdef CONFIG_PROC_FS
745 static struct snd_info_entry
*snd_card_info_entry
;
747 static void snd_card_info_read(struct snd_info_entry
*entry
,
748 struct snd_info_buffer
*buffer
)
751 struct snd_card
*card
;
753 for (idx
= count
= 0; idx
< SNDRV_CARDS
; idx
++) {
754 mutex_lock(&snd_card_mutex
);
755 if ((card
= snd_cards
[idx
]) != NULL
) {
757 snd_iprintf(buffer
, "%2i [%-15s]: %s - %s\n",
762 snd_iprintf(buffer
, " %s\n",
765 mutex_unlock(&snd_card_mutex
);
768 snd_iprintf(buffer
, "--- no soundcards ---\n");
771 #ifdef CONFIG_SND_OSSEMUL
773 void snd_card_info_read_oss(struct snd_info_buffer
*buffer
)
776 struct snd_card
*card
;
778 for (idx
= count
= 0; idx
< SNDRV_CARDS
; idx
++) {
779 mutex_lock(&snd_card_mutex
);
780 if ((card
= snd_cards
[idx
]) != NULL
) {
782 snd_iprintf(buffer
, "%s\n", card
->longname
);
784 mutex_unlock(&snd_card_mutex
);
787 snd_iprintf(buffer
, "--- no soundcards ---\n");
794 static struct snd_info_entry
*snd_card_module_info_entry
;
795 static void snd_card_module_info_read(struct snd_info_entry
*entry
,
796 struct snd_info_buffer
*buffer
)
799 struct snd_card
*card
;
801 for (idx
= 0; idx
< SNDRV_CARDS
; idx
++) {
802 mutex_lock(&snd_card_mutex
);
803 if ((card
= snd_cards
[idx
]) != NULL
)
804 snd_iprintf(buffer
, "%2i %s\n",
805 idx
, card
->module
->name
);
806 mutex_unlock(&snd_card_mutex
);
811 int __init
snd_card_info_init(void)
813 struct snd_info_entry
*entry
;
815 entry
= snd_info_create_module_entry(THIS_MODULE
, "cards", NULL
);
818 entry
->c
.text
.read
= snd_card_info_read
;
819 if (snd_info_register(entry
) < 0) {
820 snd_info_free_entry(entry
);
823 snd_card_info_entry
= entry
;
826 entry
= snd_info_create_module_entry(THIS_MODULE
, "modules", NULL
);
828 entry
->c
.text
.read
= snd_card_module_info_read
;
829 if (snd_info_register(entry
) < 0)
830 snd_info_free_entry(entry
);
832 snd_card_module_info_entry
= entry
;
839 int __exit
snd_card_info_done(void)
841 snd_info_free_entry(snd_card_info_entry
);
843 snd_info_free_entry(snd_card_module_info_entry
);
848 #endif /* CONFIG_PROC_FS */
851 * snd_component_add - add a component string
852 * @card: soundcard structure
853 * @component: the component id string
855 * This function adds the component id string to the supported list.
856 * The component can be referred from the alsa-lib.
858 * Return: Zero otherwise a negative error code.
861 int snd_component_add(struct snd_card
*card
, const char *component
)
864 int len
= strlen(component
);
866 ptr
= strstr(card
->components
, component
);
868 if (ptr
[len
] == '\0' || ptr
[len
] == ' ') /* already there */
871 if (strlen(card
->components
) + 1 + len
+ 1 > sizeof(card
->components
)) {
875 if (card
->components
[0] != '\0')
876 strcat(card
->components
, " ");
877 strcat(card
->components
, component
);
881 EXPORT_SYMBOL(snd_component_add
);
884 * snd_card_file_add - add the file to the file list of the card
885 * @card: soundcard structure
886 * @file: file pointer
888 * This function adds the file to the file linked-list of the card.
889 * This linked-list is used to keep tracking the connection state,
890 * and to avoid the release of busy resources by hotplug.
892 * Return: zero or a negative error code.
894 int snd_card_file_add(struct snd_card
*card
, struct file
*file
)
896 struct snd_monitor_file
*mfile
;
898 mfile
= kmalloc(sizeof(*mfile
), GFP_KERNEL
);
902 mfile
->disconnected_f_op
= NULL
;
903 INIT_LIST_HEAD(&mfile
->shutdown_list
);
904 spin_lock(&card
->files_lock
);
905 if (card
->shutdown
) {
906 spin_unlock(&card
->files_lock
);
910 list_add(&mfile
->list
, &card
->files_list
);
911 atomic_inc(&card
->refcount
);
912 spin_unlock(&card
->files_lock
);
916 EXPORT_SYMBOL(snd_card_file_add
);
919 * snd_card_file_remove - remove the file from the file list
920 * @card: soundcard structure
921 * @file: file pointer
923 * This function removes the file formerly added to the card via
924 * snd_card_file_add() function.
925 * If all files are removed and snd_card_free_when_closed() was
926 * called beforehand, it processes the pending release of
929 * Return: Zero or a negative error code.
931 int snd_card_file_remove(struct snd_card
*card
, struct file
*file
)
933 struct snd_monitor_file
*mfile
, *found
= NULL
;
935 spin_lock(&card
->files_lock
);
936 list_for_each_entry(mfile
, &card
->files_list
, list
) {
937 if (mfile
->file
== file
) {
938 list_del(&mfile
->list
);
939 spin_lock(&shutdown_lock
);
940 list_del(&mfile
->shutdown_list
);
941 spin_unlock(&shutdown_lock
);
942 if (mfile
->disconnected_f_op
)
943 fops_put(mfile
->disconnected_f_op
);
948 spin_unlock(&card
->files_lock
);
950 snd_printk(KERN_ERR
"ALSA card file remove problem (%p)\n", file
);
954 snd_card_unref(card
);
958 EXPORT_SYMBOL(snd_card_file_remove
);
962 * snd_power_wait - wait until the power-state is changed.
963 * @card: soundcard structure
964 * @power_state: expected power state
966 * Waits until the power-state is changed.
968 * Return: Zero if successful, or a negative error code.
970 * Note: the power lock must be active before call.
972 int snd_power_wait(struct snd_card
*card
, unsigned int power_state
)
978 if (snd_power_get_state(card
) == power_state
)
980 init_waitqueue_entry(&wait
, current
);
981 add_wait_queue(&card
->power_sleep
, &wait
);
983 if (card
->shutdown
) {
987 if (snd_power_get_state(card
) == power_state
)
989 set_current_state(TASK_UNINTERRUPTIBLE
);
990 snd_power_unlock(card
);
991 schedule_timeout(30 * HZ
);
992 snd_power_lock(card
);
994 remove_wait_queue(&card
->power_sleep
, &wait
);
998 EXPORT_SYMBOL(snd_power_wait
);
999 #endif /* CONFIG_PM */