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)
112 struct snd_info_entry *entry;
114 entry = snd_info_create_card_entry(card, "id", card->proc_root);
116 dev_dbg(card->dev, "unable to create card entry\n");
119 entry->c.text.read = snd_card_id_read;
120 card->proc_id = entry;
122 return snd_info_card_register(card);
124 #else /* !CONFIG_SND_PROC_FS */
125 #define init_info_for_card(card)
128 static int check_empty_slot(struct module *module, int slot)
130 return !slots[slot] || !*slots[slot];
133 /* return an empty slot number (>= 0) found in the given bitmask @mask.
134 * @mask == -1 == 0xffffffff means: take any free slot up to 32
135 * when no slot is available, return the original @mask as is.
137 static int get_slot_from_bitmask(int mask, int (*check)(struct module *, int),
138 struct module *module)
142 for (slot = 0; slot < SNDRV_CARDS; slot++) {
143 if (slot < 32 && !(mask & (1U << slot)))
145 if (!test_bit(slot, snd_cards_lock)) {
146 if (check(module, slot))
147 return slot; /* found */
150 return mask; /* unchanged */
153 /* the default release callback set in snd_device_initialize() below;
154 * this is just NOP for now, as almost all jobs are already done in
155 * dev_free callback of snd_device chain instead.
157 static void default_release(struct device *dev)
162 * snd_device_initialize - Initialize struct device for sound devices
163 * @dev: device to initialize
164 * @card: card to assign, optional
166 void snd_device_initialize(struct device *dev, struct snd_card *card)
168 device_initialize(dev);
170 dev->parent = &card->card_dev;
171 dev->class = sound_class;
172 dev->release = default_release;
174 EXPORT_SYMBOL_GPL(snd_device_initialize);
176 static int snd_card_do_free(struct snd_card *card);
177 static const struct attribute_group card_dev_attr_group;
179 static void release_card_device(struct device *dev)
181 snd_card_do_free(dev_to_snd_card(dev));
185 * snd_card_new - create and initialize a soundcard structure
186 * @parent: the parent device object
187 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
188 * @xid: card identification (ASCII string)
189 * @module: top level module for locking
190 * @extra_size: allocate this extra size after the main soundcard structure
191 * @card_ret: the pointer to store the created card instance
193 * Creates and initializes a soundcard structure.
195 * The function allocates snd_card instance via kzalloc with the given
196 * space for the driver to use freely. The allocated struct is stored
197 * in the given card_ret pointer.
199 * Return: Zero if successful or a negative error code.
201 int snd_card_new(struct device *parent, int idx, const char *xid,
202 struct module *module, int extra_size,
203 struct snd_card **card_ret)
205 struct snd_card *card;
208 if (snd_BUG_ON(!card_ret))
214 card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
218 card->private_data = (char *)card + sizeof(struct snd_card);
220 strlcpy(card->id, xid, sizeof(card->id));
222 mutex_lock(&snd_card_mutex);
223 if (idx < 0) /* first check the matching module-name slot */
224 idx = get_slot_from_bitmask(idx, module_slot_match, module);
225 if (idx < 0) /* if not matched, assign an empty slot */
226 idx = get_slot_from_bitmask(idx, check_empty_slot, module);
229 else if (idx < snd_ecards_limit) {
230 if (test_bit(idx, snd_cards_lock))
231 err = -EBUSY; /* invalid */
232 } else if (idx >= SNDRV_CARDS)
235 mutex_unlock(&snd_card_mutex);
236 dev_err(parent, "cannot find the slot for index %d (range 0-%i), error: %d\n",
237 idx, snd_ecards_limit - 1, err);
241 set_bit(idx, snd_cards_lock); /* lock it */
242 if (idx >= snd_ecards_limit)
243 snd_ecards_limit = idx + 1; /* increase the limit */
244 mutex_unlock(&snd_card_mutex);
247 card->module = module;
248 INIT_LIST_HEAD(&card->devices);
249 init_rwsem(&card->controls_rwsem);
250 rwlock_init(&card->ctl_files_rwlock);
251 INIT_LIST_HEAD(&card->controls);
252 INIT_LIST_HEAD(&card->ctl_files);
253 spin_lock_init(&card->files_lock);
254 INIT_LIST_HEAD(&card->files_list);
256 init_waitqueue_head(&card->power_sleep);
259 device_initialize(&card->card_dev);
260 card->card_dev.parent = parent;
261 card->card_dev.class = sound_class;
262 card->card_dev.release = release_card_device;
263 card->card_dev.groups = card->dev_groups;
264 card->dev_groups[0] = &card_dev_attr_group;
265 err = kobject_set_name(&card->card_dev.kobj, "card%d", idx);
269 snprintf(card->irq_descr, sizeof(card->irq_descr), "%s:%s",
270 dev_driver_string(card->dev), dev_name(&card->card_dev));
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);
408 /* replace file->f_op with special dummy operations */
409 list_for_each_entry(mfile, &card->files_list, list) {
410 /* it's critical part, use endless loop */
411 /* we have no room to fail */
412 mfile->disconnected_f_op = mfile->file->f_op;
414 spin_lock(&shutdown_lock);
415 list_add(&mfile->shutdown_list, &shutdown_files);
416 spin_unlock(&shutdown_lock);
418 mfile->file->f_op = &snd_shutdown_f_ops;
419 fops_get(mfile->file->f_op);
421 spin_unlock(&card->files_lock);
423 /* notify all connected devices about disconnection */
424 /* at this point, they cannot respond to any calls except release() */
426 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
427 if (snd_mixer_oss_notify_callback)
428 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
431 /* notify all devices that we are disconnected */
432 snd_device_disconnect_all(card);
434 snd_info_card_disconnect(card);
435 if (card->registered) {
436 device_del(&card->card_dev);
437 card->registered = false;
440 /* disable fops (user space) operations for ALSA API */
441 mutex_lock(&snd_card_mutex);
442 snd_cards[card->number] = NULL;
443 clear_bit(card->number, snd_cards_lock);
444 mutex_unlock(&snd_card_mutex);
447 wake_up(&card->power_sleep);
451 EXPORT_SYMBOL(snd_card_disconnect);
453 static int snd_card_do_free(struct snd_card *card)
455 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
456 if (snd_mixer_oss_notify_callback)
457 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
459 snd_device_free_all(card);
460 if (card->private_free)
461 card->private_free(card);
462 snd_info_free_entry(card->proc_id);
463 if (snd_info_card_free(card) < 0) {
464 dev_warn(card->dev, "unable to free card info\n");
465 /* Not fatal error */
467 if (card->release_completion)
468 complete(card->release_completion);
474 * snd_card_free_when_closed - Disconnect the card, free it later eventually
475 * @card: soundcard structure
477 * Unlike snd_card_free(), this function doesn't try to release the card
478 * resource immediately, but tries to disconnect at first. When the card
479 * is still in use, the function returns before freeing the resources.
480 * The card resources will be freed when the refcount gets to zero.
482 int snd_card_free_when_closed(struct snd_card *card)
484 int ret = snd_card_disconnect(card);
487 put_device(&card->card_dev);
490 EXPORT_SYMBOL(snd_card_free_when_closed);
493 * snd_card_free - frees given soundcard structure
494 * @card: soundcard structure
496 * This function releases the soundcard structure and the all assigned
497 * devices automatically. That is, you don't have to release the devices
500 * This function waits until the all resources are properly released.
502 * Return: Zero. Frees all associated devices and frees the control
503 * interface associated to given soundcard.
505 int snd_card_free(struct snd_card *card)
507 struct completion released;
510 init_completion(&released);
511 card->release_completion = &released;
512 ret = snd_card_free_when_closed(card);
515 /* wait, until all devices are ready for the free operation */
516 wait_for_completion(&released);
519 EXPORT_SYMBOL(snd_card_free);
521 /* retrieve the last word of shortname or longname */
522 static const char *retrieve_id_from_card_name(const char *name)
524 const char *spos = name;
527 if (isspace(*name) && isalnum(name[1]))
534 /* return true if the given id string doesn't conflict any other card ids */
535 static bool card_id_ok(struct snd_card *card, const char *id)
538 if (!snd_info_check_reserved_words(id))
540 for (i = 0; i < snd_ecards_limit; i++) {
541 if (snd_cards[i] && snd_cards[i] != card &&
542 !strcmp(snd_cards[i]->id, id))
548 /* copy to card->id only with valid letters from nid */
549 static void copy_valid_id_string(struct snd_card *card, const char *src,
554 while (*nid && !isalnum(*nid))
557 *id++ = isalpha(*src) ? *src : 'D';
558 while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
566 /* Set card->id from the given string
567 * If the string conflicts with other ids, add a suffix to make it unique.
569 static void snd_card_set_id_no_lock(struct snd_card *card, const char *src,
573 bool is_default = false;
576 copy_valid_id_string(card, src, nid);
580 /* use "Default" for obviously invalid strings
581 * ("card" conflicts with proc directories)
583 if (!*id || !strncmp(id, "card", 4)) {
584 strcpy(id, "Default");
589 for (loops = 0; loops < SNDRV_CARDS; loops++) {
591 char sfxstr[5]; /* "_012" */
594 if (card_id_ok(card, id))
597 /* Add _XYZ suffix */
598 sprintf(sfxstr, "_%X", loops + 1);
599 sfxlen = strlen(sfxstr);
600 if (len + sfxlen >= sizeof(card->id))
601 spos = id + sizeof(card->id) - sfxlen - 1;
604 strcpy(spos, sfxstr);
606 /* fallback to the default id */
612 dev_err(card->dev, "unable to set card id (%s)\n", id);
613 if (card->proc_root->name)
614 strlcpy(card->id, card->proc_root->name, sizeof(card->id));
618 * snd_card_set_id - set card identification name
619 * @card: soundcard structure
620 * @nid: new identification string
622 * This function sets the card identification and checks for name
625 void snd_card_set_id(struct snd_card *card, const char *nid)
627 /* check if user specified own card->id */
628 if (card->id[0] != '\0')
630 mutex_lock(&snd_card_mutex);
631 snd_card_set_id_no_lock(card, nid, nid);
632 mutex_unlock(&snd_card_mutex);
634 EXPORT_SYMBOL(snd_card_set_id);
637 card_id_show_attr(struct device *dev,
638 struct device_attribute *attr, char *buf)
640 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
641 return snprintf(buf, PAGE_SIZE, "%s\n", card->id);
645 card_id_store_attr(struct device *dev, struct device_attribute *attr,
646 const char *buf, size_t count)
648 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
649 char buf1[sizeof(card->id)];
650 size_t copy = count > sizeof(card->id) - 1 ?
651 sizeof(card->id) - 1 : count;
655 for (idx = 0; idx < copy; idx++) {
657 if (!isalnum(c) && c != '_' && c != '-')
660 memcpy(buf1, buf, copy);
662 mutex_lock(&snd_card_mutex);
663 if (!card_id_ok(NULL, buf1)) {
664 mutex_unlock(&snd_card_mutex);
667 strcpy(card->id, buf1);
668 snd_info_card_id_change(card);
669 mutex_unlock(&snd_card_mutex);
674 static DEVICE_ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr);
677 card_number_show_attr(struct device *dev,
678 struct device_attribute *attr, char *buf)
680 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
681 return snprintf(buf, PAGE_SIZE, "%i\n", card->number);
684 static DEVICE_ATTR(number, S_IRUGO, card_number_show_attr, NULL);
686 static struct attribute *card_dev_attrs[] = {
688 &dev_attr_number.attr,
692 static const struct attribute_group card_dev_attr_group = {
693 .attrs = card_dev_attrs,
697 * snd_card_add_dev_attr - Append a new sysfs attribute group to card
698 * @card: card instance
699 * @group: attribute group to append
701 int snd_card_add_dev_attr(struct snd_card *card,
702 const struct attribute_group *group)
706 /* loop for (arraysize-1) here to keep NULL at the last entry */
707 for (i = 0; i < ARRAY_SIZE(card->dev_groups) - 1; i++) {
708 if (!card->dev_groups[i]) {
709 card->dev_groups[i] = group;
714 dev_err(card->dev, "Too many groups assigned\n");
717 EXPORT_SYMBOL_GPL(snd_card_add_dev_attr);
720 * snd_card_register - register the soundcard
721 * @card: soundcard structure
723 * This function registers all the devices assigned to the soundcard.
724 * Until calling this, the ALSA control interface is blocked from the
725 * external accesses. Thus, you should call this function at the end
726 * of the initialization of the card.
728 * Return: Zero otherwise a negative error code if the registration failed.
730 int snd_card_register(struct snd_card *card)
734 if (snd_BUG_ON(!card))
737 if (!card->registered) {
738 err = device_add(&card->card_dev);
741 card->registered = true;
744 if ((err = snd_device_register_all(card)) < 0)
746 mutex_lock(&snd_card_mutex);
747 if (snd_cards[card->number]) {
748 /* already registered */
749 mutex_unlock(&snd_card_mutex);
750 return snd_info_card_register(card); /* register pending info */
753 /* make a unique id name from the given string */
754 char tmpid[sizeof(card->id)];
755 memcpy(tmpid, card->id, sizeof(card->id));
756 snd_card_set_id_no_lock(card, tmpid, tmpid);
758 /* create an id from either shortname or longname */
760 src = *card->shortname ? card->shortname : card->longname;
761 snd_card_set_id_no_lock(card, src,
762 retrieve_id_from_card_name(src));
764 snd_cards[card->number] = card;
765 mutex_unlock(&snd_card_mutex);
766 init_info_for_card(card);
767 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
768 if (snd_mixer_oss_notify_callback)
769 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
773 EXPORT_SYMBOL(snd_card_register);
775 #ifdef CONFIG_SND_PROC_FS
776 static void snd_card_info_read(struct snd_info_entry *entry,
777 struct snd_info_buffer *buffer)
780 struct snd_card *card;
782 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
783 mutex_lock(&snd_card_mutex);
784 if ((card = snd_cards[idx]) != NULL) {
786 snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
791 snd_iprintf(buffer, " %s\n",
794 mutex_unlock(&snd_card_mutex);
797 snd_iprintf(buffer, "--- no soundcards ---\n");
800 #ifdef CONFIG_SND_OSSEMUL
801 void snd_card_info_read_oss(struct snd_info_buffer *buffer)
804 struct snd_card *card;
806 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
807 mutex_lock(&snd_card_mutex);
808 if ((card = snd_cards[idx]) != NULL) {
810 snd_iprintf(buffer, "%s\n", card->longname);
812 mutex_unlock(&snd_card_mutex);
815 snd_iprintf(buffer, "--- no soundcards ---\n");
822 static void snd_card_module_info_read(struct snd_info_entry *entry,
823 struct snd_info_buffer *buffer)
826 struct snd_card *card;
828 for (idx = 0; idx < SNDRV_CARDS; idx++) {
829 mutex_lock(&snd_card_mutex);
830 if ((card = snd_cards[idx]) != NULL)
831 snd_iprintf(buffer, "%2i %s\n",
832 idx, card->module->name);
833 mutex_unlock(&snd_card_mutex);
838 int __init snd_card_info_init(void)
840 struct snd_info_entry *entry;
842 entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
845 entry->c.text.read = snd_card_info_read;
846 if (snd_info_register(entry) < 0)
847 return -ENOMEM; /* freed in error path */
850 entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
853 entry->c.text.read = snd_card_module_info_read;
854 if (snd_info_register(entry) < 0)
855 return -ENOMEM; /* freed in error path */
860 #endif /* CONFIG_SND_PROC_FS */
863 * snd_component_add - add a component string
864 * @card: soundcard structure
865 * @component: the component id string
867 * This function adds the component id string to the supported list.
868 * The component can be referred from the alsa-lib.
870 * Return: Zero otherwise a negative error code.
873 int snd_component_add(struct snd_card *card, const char *component)
876 int len = strlen(component);
878 ptr = strstr(card->components, component);
880 if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */
883 if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
887 if (card->components[0] != '\0')
888 strcat(card->components, " ");
889 strcat(card->components, component);
892 EXPORT_SYMBOL(snd_component_add);
895 * snd_card_file_add - add the file to the file list of the card
896 * @card: soundcard structure
897 * @file: file pointer
899 * This function adds the file to the file linked-list of the card.
900 * This linked-list is used to keep tracking the connection state,
901 * and to avoid the release of busy resources by hotplug.
903 * Return: zero or a negative error code.
905 int snd_card_file_add(struct snd_card *card, struct file *file)
907 struct snd_monitor_file *mfile;
909 mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
913 mfile->disconnected_f_op = NULL;
914 INIT_LIST_HEAD(&mfile->shutdown_list);
915 spin_lock(&card->files_lock);
916 if (card->shutdown) {
917 spin_unlock(&card->files_lock);
921 list_add(&mfile->list, &card->files_list);
922 get_device(&card->card_dev);
923 spin_unlock(&card->files_lock);
926 EXPORT_SYMBOL(snd_card_file_add);
929 * snd_card_file_remove - remove the file from the file list
930 * @card: soundcard structure
931 * @file: file pointer
933 * This function removes the file formerly added to the card via
934 * snd_card_file_add() function.
935 * If all files are removed and snd_card_free_when_closed() was
936 * called beforehand, it processes the pending release of
939 * Return: Zero or a negative error code.
941 int snd_card_file_remove(struct snd_card *card, struct file *file)
943 struct snd_monitor_file *mfile, *found = NULL;
945 spin_lock(&card->files_lock);
946 list_for_each_entry(mfile, &card->files_list, list) {
947 if (mfile->file == file) {
948 list_del(&mfile->list);
949 spin_lock(&shutdown_lock);
950 list_del(&mfile->shutdown_list);
951 spin_unlock(&shutdown_lock);
952 if (mfile->disconnected_f_op)
953 fops_put(mfile->disconnected_f_op);
958 spin_unlock(&card->files_lock);
960 dev_err(card->dev, "card file remove problem (%p)\n", file);
964 put_device(&card->card_dev);
967 EXPORT_SYMBOL(snd_card_file_remove);
971 * snd_power_wait - wait until the power-state is changed.
972 * @card: soundcard structure
973 * @power_state: expected power state
975 * Waits until the power-state is changed.
977 * Return: Zero if successful, or a negative error code.
979 int snd_power_wait(struct snd_card *card, unsigned int power_state)
981 wait_queue_entry_t wait;
985 if (snd_power_get_state(card) == power_state)
987 init_waitqueue_entry(&wait, current);
988 add_wait_queue(&card->power_sleep, &wait);
990 if (card->shutdown) {
994 if (snd_power_get_state(card) == power_state)
996 set_current_state(TASK_UNINTERRUPTIBLE);
997 schedule_timeout(30 * HZ);
999 remove_wait_queue(&card->power_sleep, &wait);
1002 EXPORT_SYMBOL(snd_power_wait);
1003 #endif /* CONFIG_PM */