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 IS_ENABLED(CONFIG_SND_MIXER_OSS)
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 */
159 static int snd_card_do_free(struct snd_card *card);
161 static void release_card_device(struct device *dev)
163 snd_card_do_free(dev_to_snd_card(dev));
167 * snd_card_new - create and initialize a soundcard structure
168 * @parent: the parent device object
169 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
170 * @xid: card identification (ASCII string)
171 * @module: top level module for locking
172 * @extra_size: allocate this extra size after the main soundcard structure
173 * @card_ret: the pointer to store the created card instance
175 * Creates and initializes a soundcard structure.
177 * The function allocates snd_card instance via kzalloc with the given
178 * space for the driver to use freely. The allocated struct is stored
179 * in the given card_ret pointer.
181 * Return: Zero if successful or a negative error code.
183 int snd_card_new(struct device *parent, int idx, const char *xid,
184 struct module *module, int extra_size,
185 struct snd_card **card_ret)
187 struct snd_card *card;
190 if (snd_BUG_ON(!card_ret))
196 card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
200 card->private_data = (char *)card + sizeof(struct snd_card);
202 strlcpy(card->id, xid, sizeof(card->id));
204 mutex_lock(&snd_card_mutex);
205 if (idx < 0) /* first check the matching module-name slot */
206 idx = get_slot_from_bitmask(idx, module_slot_match, module);
207 if (idx < 0) /* if not matched, assign an empty slot */
208 idx = get_slot_from_bitmask(idx, check_empty_slot, module);
211 else if (idx < snd_ecards_limit) {
212 if (test_bit(idx, snd_cards_lock))
213 err = -EBUSY; /* invalid */
214 } else if (idx >= SNDRV_CARDS)
217 mutex_unlock(&snd_card_mutex);
218 snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n",
219 idx, snd_ecards_limit - 1, err);
223 set_bit(idx, snd_cards_lock); /* lock it */
224 if (idx >= snd_ecards_limit)
225 snd_ecards_limit = idx + 1; /* increase the limit */
226 mutex_unlock(&snd_card_mutex);
229 card->module = module;
230 INIT_LIST_HEAD(&card->devices);
231 init_rwsem(&card->controls_rwsem);
232 rwlock_init(&card->ctl_files_rwlock);
233 INIT_LIST_HEAD(&card->controls);
234 INIT_LIST_HEAD(&card->ctl_files);
235 spin_lock_init(&card->files_lock);
236 INIT_LIST_HEAD(&card->files_list);
237 init_waitqueue_head(&card->shutdown_sleep);
238 atomic_set(&card->refcount, 0);
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 err = kobject_set_name(&card->card_dev.kobj, "card%d", idx);
252 /* the control interface cannot be accessed from the user space until */
253 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
254 err = snd_ctl_create(card);
256 snd_printk(KERN_ERR "unable to register control minors\n");
259 err = snd_info_card_create(card);
261 snd_printk(KERN_ERR "unable to create card info\n");
268 snd_device_free_all(card, SNDRV_DEV_CMD_PRE);
270 put_device(&card->card_dev);
273 EXPORT_SYMBOL(snd_card_new);
275 /* return non-zero if a card is already locked */
276 int snd_card_locked(int card)
280 mutex_lock(&snd_card_mutex);
281 locked = test_bit(card, snd_cards_lock);
282 mutex_unlock(&snd_card_mutex);
286 static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
291 static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
292 size_t count, loff_t *offset)
297 static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
298 size_t count, loff_t *offset)
303 static int snd_disconnect_release(struct inode *inode, struct file *file)
305 struct snd_monitor_file *df = NULL, *_df;
307 spin_lock(&shutdown_lock);
308 list_for_each_entry(_df, &shutdown_files, shutdown_list) {
309 if (_df->file == file) {
311 list_del_init(&df->shutdown_list);
315 spin_unlock(&shutdown_lock);
318 if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync)
319 df->disconnected_f_op->fasync(-1, file, 0);
320 return df->disconnected_f_op->release(inode, file);
323 panic("%s(%p, %p) failed!", __func__, inode, file);
326 static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait)
328 return POLLERR | POLLNVAL;
331 static long snd_disconnect_ioctl(struct file *file,
332 unsigned int cmd, unsigned long arg)
337 static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
342 static int snd_disconnect_fasync(int fd, struct file *file, int on)
347 static const struct file_operations snd_shutdown_f_ops =
349 .owner = THIS_MODULE,
350 .llseek = snd_disconnect_llseek,
351 .read = snd_disconnect_read,
352 .write = snd_disconnect_write,
353 .release = snd_disconnect_release,
354 .poll = snd_disconnect_poll,
355 .unlocked_ioctl = snd_disconnect_ioctl,
357 .compat_ioctl = snd_disconnect_ioctl,
359 .mmap = snd_disconnect_mmap,
360 .fasync = snd_disconnect_fasync
364 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
365 * @card: soundcard structure
367 * Disconnects all APIs from the file-operations (user space).
369 * Return: Zero, otherwise a negative error code.
371 * Note: The current implementation replaces all active file->f_op with special
372 * dummy file operations (they do nothing except release).
374 int snd_card_disconnect(struct snd_card *card)
376 struct snd_monitor_file *mfile;
382 spin_lock(&card->files_lock);
383 if (card->shutdown) {
384 spin_unlock(&card->files_lock);
388 spin_unlock(&card->files_lock);
390 /* phase 1: disable fops (user space) operations for ALSA API */
391 mutex_lock(&snd_card_mutex);
392 snd_cards[card->number] = NULL;
393 clear_bit(card->number, snd_cards_lock);
394 mutex_unlock(&snd_card_mutex);
396 /* phase 2: replace file->f_op with special dummy operations */
398 spin_lock(&card->files_lock);
399 list_for_each_entry(mfile, &card->files_list, list) {
400 /* it's critical part, use endless loop */
401 /* we have no room to fail */
402 mfile->disconnected_f_op = mfile->file->f_op;
404 spin_lock(&shutdown_lock);
405 list_add(&mfile->shutdown_list, &shutdown_files);
406 spin_unlock(&shutdown_lock);
408 mfile->file->f_op = &snd_shutdown_f_ops;
409 fops_get(mfile->file->f_op);
411 spin_unlock(&card->files_lock);
413 /* phase 3: notify all connected devices about disconnection */
414 /* at this point, they cannot respond to any calls except release() */
416 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
417 if (snd_mixer_oss_notify_callback)
418 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
421 /* notify all devices that we are disconnected */
422 err = snd_device_disconnect_all(card);
424 snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number);
426 snd_info_card_disconnect(card);
427 if (card->registered) {
428 device_del(&card->card_dev);
429 card->registered = false;
432 wake_up(&card->power_sleep);
437 EXPORT_SYMBOL(snd_card_disconnect);
440 * snd_card_free - frees given soundcard structure
441 * @card: soundcard structure
443 * This function releases the soundcard structure and the all assigned
444 * devices automatically. That is, you don't have to release the devices
447 * Return: Zero. Frees all associated devices and frees the control
448 * interface associated to given soundcard.
450 static int snd_card_do_free(struct snd_card *card)
452 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
453 if (snd_mixer_oss_notify_callback)
454 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
456 if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) {
457 snd_printk(KERN_ERR "unable to free all devices (pre)\n");
458 /* Fatal, but this situation should never occur */
460 if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) {
461 snd_printk(KERN_ERR "unable to free all devices (normal)\n");
462 /* Fatal, but this situation should never occur */
464 if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) {
465 snd_printk(KERN_ERR "unable to free all devices (post)\n");
466 /* Fatal, but this situation should never occur */
468 if (card->private_free)
469 card->private_free(card);
470 snd_info_free_entry(card->proc_id);
471 if (snd_info_card_free(card) < 0) {
472 snd_printk(KERN_WARNING "unable to free card info\n");
473 /* Not fatal error */
480 * snd_card_unref - release the reference counter
481 * @card: the card instance
483 * Decrements the reference counter. When it reaches to zero, wake up
484 * the sleeper and call the destructor if needed.
486 void snd_card_unref(struct snd_card *card)
488 if (atomic_dec_and_test(&card->refcount)) {
489 wake_up(&card->shutdown_sleep);
490 if (card->free_on_last_close)
491 put_device(&card->card_dev);
494 EXPORT_SYMBOL(snd_card_unref);
496 int snd_card_free_when_closed(struct snd_card *card)
500 atomic_inc(&card->refcount);
501 ret = snd_card_disconnect(card);
503 atomic_dec(&card->refcount);
507 card->free_on_last_close = 1;
508 if (atomic_dec_and_test(&card->refcount))
509 put_device(&card->card_dev);
513 EXPORT_SYMBOL(snd_card_free_when_closed);
515 int snd_card_free(struct snd_card *card)
517 int ret = snd_card_disconnect(card);
521 /* wait, until all devices are ready for the free operation */
522 wait_event(card->shutdown_sleep, !atomic_read(&card->refcount));
523 put_device(&card->card_dev);
527 EXPORT_SYMBOL(snd_card_free);
529 /* retrieve the last word of shortname or longname */
530 static const char *retrieve_id_from_card_name(const char *name)
532 const char *spos = name;
535 if (isspace(*name) && isalnum(name[1]))
542 /* return true if the given id string doesn't conflict any other card ids */
543 static bool card_id_ok(struct snd_card *card, const char *id)
546 if (!snd_info_check_reserved_words(id))
548 for (i = 0; i < snd_ecards_limit; i++) {
549 if (snd_cards[i] && snd_cards[i] != card &&
550 !strcmp(snd_cards[i]->id, id))
556 /* copy to card->id only with valid letters from nid */
557 static void copy_valid_id_string(struct snd_card *card, const char *src,
562 while (*nid && !isalnum(*nid))
565 *id++ = isalpha(*src) ? *src : 'D';
566 while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
574 /* Set card->id from the given string
575 * If the string conflicts with other ids, add a suffix to make it unique.
577 static void snd_card_set_id_no_lock(struct snd_card *card, const char *src,
581 bool is_default = false;
584 copy_valid_id_string(card, src, nid);
588 /* use "Default" for obviously invalid strings
589 * ("card" conflicts with proc directories)
591 if (!*id || !strncmp(id, "card", 4)) {
592 strcpy(id, "Default");
597 for (loops = 0; loops < SNDRV_CARDS; loops++) {
599 char sfxstr[5]; /* "_012" */
602 if (card_id_ok(card, id))
605 /* Add _XYZ suffix */
606 sprintf(sfxstr, "_%X", loops + 1);
607 sfxlen = strlen(sfxstr);
608 if (len + sfxlen >= sizeof(card->id))
609 spos = id + sizeof(card->id) - sfxlen - 1;
612 strcpy(spos, sfxstr);
614 /* fallback to the default id */
620 snd_printk(KERN_ERR "unable to set card id (%s)\n", id);
621 if (card->proc_root->name)
622 strlcpy(card->id, card->proc_root->name, sizeof(card->id));
626 * snd_card_set_id - set card identification name
627 * @card: soundcard structure
628 * @nid: new identification string
630 * This function sets the card identification and checks for name
633 void snd_card_set_id(struct snd_card *card, const char *nid)
635 /* check if user specified own card->id */
636 if (card->id[0] != '\0')
638 mutex_lock(&snd_card_mutex);
639 snd_card_set_id_no_lock(card, nid, nid);
640 mutex_unlock(&snd_card_mutex);
642 EXPORT_SYMBOL(snd_card_set_id);
645 card_id_show_attr(struct device *dev,
646 struct device_attribute *attr, char *buf)
648 struct snd_card *card = dev_get_drvdata(dev);
649 return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)");
653 card_id_store_attr(struct device *dev, struct device_attribute *attr,
654 const char *buf, size_t count)
656 struct snd_card *card = dev_get_drvdata(dev);
657 char buf1[sizeof(card->id)];
658 size_t copy = count > sizeof(card->id) - 1 ?
659 sizeof(card->id) - 1 : count;
663 for (idx = 0; idx < copy; idx++) {
665 if (!isalnum(c) && c != '_' && c != '-')
668 memcpy(buf1, buf, copy);
670 mutex_lock(&snd_card_mutex);
671 if (!card_id_ok(NULL, buf1)) {
672 mutex_unlock(&snd_card_mutex);
675 strcpy(card->id, buf1);
676 snd_info_card_id_change(card);
677 mutex_unlock(&snd_card_mutex);
682 static struct device_attribute card_id_attrs =
683 __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr);
686 card_number_show_attr(struct device *dev,
687 struct device_attribute *attr, char *buf)
689 struct snd_card *card = dev_get_drvdata(dev);
690 return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1);
693 static struct device_attribute card_number_attrs =
694 __ATTR(number, S_IRUGO, card_number_show_attr, NULL);
697 * snd_card_register - register the soundcard
698 * @card: soundcard structure
700 * This function registers all the devices assigned to the soundcard.
701 * Until calling this, the ALSA control interface is blocked from the
702 * external accesses. Thus, you should call this function at the end
703 * of the initialization of the card.
705 * Return: Zero otherwise a negative error code if the registration failed.
707 int snd_card_register(struct snd_card *card)
711 if (snd_BUG_ON(!card))
714 if (!card->registered) {
715 err = device_add(&card->card_dev);
718 card->registered = true;
721 if ((err = snd_device_register_all(card)) < 0)
723 mutex_lock(&snd_card_mutex);
724 if (snd_cards[card->number]) {
725 /* already registered */
726 mutex_unlock(&snd_card_mutex);
730 /* make a unique id name from the given string */
731 char tmpid[sizeof(card->id)];
732 memcpy(tmpid, card->id, sizeof(card->id));
733 snd_card_set_id_no_lock(card, tmpid, tmpid);
735 /* create an id from either shortname or longname */
737 src = *card->shortname ? card->shortname : card->longname;
738 snd_card_set_id_no_lock(card, src,
739 retrieve_id_from_card_name(src));
741 snd_cards[card->number] = card;
742 mutex_unlock(&snd_card_mutex);
743 init_info_for_card(card);
744 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
745 if (snd_mixer_oss_notify_callback)
746 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
748 if (card->registered) {
749 err = device_create_file(&card->card_dev, &card_id_attrs);
752 err = device_create_file(&card->card_dev, &card_number_attrs);
760 EXPORT_SYMBOL(snd_card_register);
762 #ifdef CONFIG_PROC_FS
763 static struct snd_info_entry *snd_card_info_entry;
765 static void snd_card_info_read(struct snd_info_entry *entry,
766 struct snd_info_buffer *buffer)
769 struct snd_card *card;
771 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
772 mutex_lock(&snd_card_mutex);
773 if ((card = snd_cards[idx]) != NULL) {
775 snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
780 snd_iprintf(buffer, " %s\n",
783 mutex_unlock(&snd_card_mutex);
786 snd_iprintf(buffer, "--- no soundcards ---\n");
789 #ifdef CONFIG_SND_OSSEMUL
791 void snd_card_info_read_oss(struct snd_info_buffer *buffer)
794 struct snd_card *card;
796 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
797 mutex_lock(&snd_card_mutex);
798 if ((card = snd_cards[idx]) != NULL) {
800 snd_iprintf(buffer, "%s\n", card->longname);
802 mutex_unlock(&snd_card_mutex);
805 snd_iprintf(buffer, "--- no soundcards ---\n");
812 static struct snd_info_entry *snd_card_module_info_entry;
813 static void snd_card_module_info_read(struct snd_info_entry *entry,
814 struct snd_info_buffer *buffer)
817 struct snd_card *card;
819 for (idx = 0; idx < SNDRV_CARDS; idx++) {
820 mutex_lock(&snd_card_mutex);
821 if ((card = snd_cards[idx]) != NULL)
822 snd_iprintf(buffer, "%2i %s\n",
823 idx, card->module->name);
824 mutex_unlock(&snd_card_mutex);
829 int __init snd_card_info_init(void)
831 struct snd_info_entry *entry;
833 entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
836 entry->c.text.read = snd_card_info_read;
837 if (snd_info_register(entry) < 0) {
838 snd_info_free_entry(entry);
841 snd_card_info_entry = entry;
844 entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
846 entry->c.text.read = snd_card_module_info_read;
847 if (snd_info_register(entry) < 0)
848 snd_info_free_entry(entry);
850 snd_card_module_info_entry = entry;
857 int __exit snd_card_info_done(void)
859 snd_info_free_entry(snd_card_info_entry);
861 snd_info_free_entry(snd_card_module_info_entry);
866 #endif /* CONFIG_PROC_FS */
869 * snd_component_add - add a component string
870 * @card: soundcard structure
871 * @component: the component id string
873 * This function adds the component id string to the supported list.
874 * The component can be referred from the alsa-lib.
876 * Return: Zero otherwise a negative error code.
879 int snd_component_add(struct snd_card *card, const char *component)
882 int len = strlen(component);
884 ptr = strstr(card->components, component);
886 if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */
889 if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
893 if (card->components[0] != '\0')
894 strcat(card->components, " ");
895 strcat(card->components, component);
899 EXPORT_SYMBOL(snd_component_add);
902 * snd_card_file_add - add the file to the file list of the card
903 * @card: soundcard structure
904 * @file: file pointer
906 * This function adds the file to the file linked-list of the card.
907 * This linked-list is used to keep tracking the connection state,
908 * and to avoid the release of busy resources by hotplug.
910 * Return: zero or a negative error code.
912 int snd_card_file_add(struct snd_card *card, struct file *file)
914 struct snd_monitor_file *mfile;
916 mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
920 mfile->disconnected_f_op = NULL;
921 INIT_LIST_HEAD(&mfile->shutdown_list);
922 spin_lock(&card->files_lock);
923 if (card->shutdown) {
924 spin_unlock(&card->files_lock);
928 list_add(&mfile->list, &card->files_list);
929 atomic_inc(&card->refcount);
930 spin_unlock(&card->files_lock);
934 EXPORT_SYMBOL(snd_card_file_add);
937 * snd_card_file_remove - remove the file from the file list
938 * @card: soundcard structure
939 * @file: file pointer
941 * This function removes the file formerly added to the card via
942 * snd_card_file_add() function.
943 * If all files are removed and snd_card_free_when_closed() was
944 * called beforehand, it processes the pending release of
947 * Return: Zero or a negative error code.
949 int snd_card_file_remove(struct snd_card *card, struct file *file)
951 struct snd_monitor_file *mfile, *found = NULL;
953 spin_lock(&card->files_lock);
954 list_for_each_entry(mfile, &card->files_list, list) {
955 if (mfile->file == file) {
956 list_del(&mfile->list);
957 spin_lock(&shutdown_lock);
958 list_del(&mfile->shutdown_list);
959 spin_unlock(&shutdown_lock);
960 if (mfile->disconnected_f_op)
961 fops_put(mfile->disconnected_f_op);
966 spin_unlock(&card->files_lock);
968 snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file);
972 snd_card_unref(card);
976 EXPORT_SYMBOL(snd_card_file_remove);
980 * snd_power_wait - wait until the power-state is changed.
981 * @card: soundcard structure
982 * @power_state: expected power state
984 * Waits until the power-state is changed.
986 * Return: Zero if successful, or a negative error code.
988 * Note: the power lock must be active before call.
990 int snd_power_wait(struct snd_card *card, unsigned int power_state)
996 if (snd_power_get_state(card) == power_state)
998 init_waitqueue_entry(&wait, current);
999 add_wait_queue(&card->power_sleep, &wait);
1001 if (card->shutdown) {
1005 if (snd_power_get_state(card) == power_state)
1007 set_current_state(TASK_UNINTERRUPTIBLE);
1008 snd_power_unlock(card);
1009 schedule_timeout(30 * HZ);
1010 snd_power_lock(card);
1012 remove_wait_queue(&card->power_sleep, &wait);
1016 EXPORT_SYMBOL(snd_power_wait);
1017 #endif /* CONFIG_PM */