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 static struct snd_card *snd_cards[SNDRV_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 static int check_empty_slot(struct module *module, int slot)
104 return !slots[slot] || !*slots[slot];
107 /* return an empty slot number (>= 0) found in the given bitmask @mask.
108 * @mask == -1 == 0xffffffff means: take any free slot up to 32
109 * when no slot is available, return the original @mask as is.
111 static int get_slot_from_bitmask(int mask, int (*check)(struct module *, int),
112 struct module *module)
116 for (slot = 0; slot < SNDRV_CARDS; slot++) {
117 if (slot < 32 && !(mask & (1U << slot)))
119 if (!test_bit(slot, snd_cards_lock)) {
120 if (check(module, slot))
121 return slot; /* found */
124 return mask; /* unchanged */
127 /* the default release callback set in snd_device_initialize() below;
128 * this is just NOP for now, as almost all jobs are already done in
129 * dev_free callback of snd_device chain instead.
131 static void default_release(struct device *dev)
136 * snd_device_initialize - Initialize struct device for sound devices
137 * @dev: device to initialize
138 * @card: card to assign, optional
140 void snd_device_initialize(struct device *dev, struct snd_card *card)
142 device_initialize(dev);
144 dev->parent = &card->card_dev;
145 dev->class = sound_class;
146 dev->release = default_release;
148 EXPORT_SYMBOL_GPL(snd_device_initialize);
150 static int snd_card_do_free(struct snd_card *card);
151 static const struct attribute_group card_dev_attr_group;
153 static void release_card_device(struct device *dev)
155 snd_card_do_free(dev_to_snd_card(dev));
159 * snd_card_new - create and initialize a soundcard structure
160 * @parent: the parent device object
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_new(struct device *parent, 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 card->private_data = (char *)card + sizeof(struct snd_card);
194 strlcpy(card->id, xid, sizeof(card->id));
196 mutex_lock(&snd_card_mutex);
197 if (idx < 0) /* first check the matching module-name slot */
198 idx = get_slot_from_bitmask(idx, module_slot_match, module);
199 if (idx < 0) /* if not matched, assign an empty slot */
200 idx = get_slot_from_bitmask(idx, check_empty_slot, module);
203 else if (idx < snd_ecards_limit) {
204 if (test_bit(idx, snd_cards_lock))
205 err = -EBUSY; /* invalid */
206 } else if (idx >= SNDRV_CARDS)
209 mutex_unlock(&snd_card_mutex);
210 dev_err(parent, "cannot find the slot for index %d (range 0-%i), error: %d\n",
211 idx, snd_ecards_limit - 1, err);
215 set_bit(idx, snd_cards_lock); /* lock it */
216 if (idx >= snd_ecards_limit)
217 snd_ecards_limit = idx + 1; /* increase the limit */
218 mutex_unlock(&snd_card_mutex);
221 card->module = module;
222 INIT_LIST_HEAD(&card->devices);
223 init_rwsem(&card->controls_rwsem);
224 rwlock_init(&card->ctl_files_rwlock);
225 INIT_LIST_HEAD(&card->controls);
226 INIT_LIST_HEAD(&card->ctl_files);
227 spin_lock_init(&card->files_lock);
228 INIT_LIST_HEAD(&card->files_list);
230 init_waitqueue_head(&card->power_sleep);
232 init_waitqueue_head(&card->remove_sleep);
234 device_initialize(&card->card_dev);
235 card->card_dev.parent = parent;
236 card->card_dev.class = sound_class;
237 card->card_dev.release = release_card_device;
238 card->card_dev.groups = card->dev_groups;
239 card->dev_groups[0] = &card_dev_attr_group;
240 err = kobject_set_name(&card->card_dev.kobj, "card%d", idx);
244 snprintf(card->irq_descr, sizeof(card->irq_descr), "%s:%s",
245 dev_driver_string(card->dev), dev_name(&card->card_dev));
247 /* the control interface cannot be accessed from the user space until */
248 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
249 err = snd_ctl_create(card);
251 dev_err(parent, "unable to register control minors\n");
254 err = snd_info_card_create(card);
256 dev_err(parent, "unable to create card info\n");
263 snd_device_free_all(card);
265 put_device(&card->card_dev);
268 EXPORT_SYMBOL(snd_card_new);
271 * snd_card_ref - Get the card object from the index
272 * @idx: the card index
274 * Returns a card object corresponding to the given index or NULL if not found.
275 * Release the object via snd_card_unref().
277 struct snd_card *snd_card_ref(int idx)
279 struct snd_card *card;
281 mutex_lock(&snd_card_mutex);
282 card = snd_cards[idx];
284 get_device(&card->card_dev);
285 mutex_unlock(&snd_card_mutex);
288 EXPORT_SYMBOL_GPL(snd_card_ref);
290 /* return non-zero if a card is already locked */
291 int snd_card_locked(int card)
295 mutex_lock(&snd_card_mutex);
296 locked = test_bit(card, snd_cards_lock);
297 mutex_unlock(&snd_card_mutex);
301 static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
306 static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
307 size_t count, loff_t *offset)
312 static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
313 size_t count, loff_t *offset)
318 static int snd_disconnect_release(struct inode *inode, struct file *file)
320 struct snd_monitor_file *df = NULL, *_df;
322 spin_lock(&shutdown_lock);
323 list_for_each_entry(_df, &shutdown_files, shutdown_list) {
324 if (_df->file == file) {
326 list_del_init(&df->shutdown_list);
330 spin_unlock(&shutdown_lock);
333 if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync)
334 df->disconnected_f_op->fasync(-1, file, 0);
335 return df->disconnected_f_op->release(inode, file);
338 panic("%s(%p, %p) failed!", __func__, inode, file);
341 static __poll_t snd_disconnect_poll(struct file * file, poll_table * wait)
343 return EPOLLERR | EPOLLNVAL;
346 static long snd_disconnect_ioctl(struct file *file,
347 unsigned int cmd, unsigned long arg)
352 static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
357 static int snd_disconnect_fasync(int fd, struct file *file, int on)
362 static const struct file_operations snd_shutdown_f_ops =
364 .owner = THIS_MODULE,
365 .llseek = snd_disconnect_llseek,
366 .read = snd_disconnect_read,
367 .write = snd_disconnect_write,
368 .release = snd_disconnect_release,
369 .poll = snd_disconnect_poll,
370 .unlocked_ioctl = snd_disconnect_ioctl,
372 .compat_ioctl = snd_disconnect_ioctl,
374 .mmap = snd_disconnect_mmap,
375 .fasync = snd_disconnect_fasync
379 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
380 * @card: soundcard structure
382 * Disconnects all APIs from the file-operations (user space).
384 * Return: Zero, otherwise a negative error code.
386 * Note: The current implementation replaces all active file->f_op with special
387 * dummy file operations (they do nothing except release).
389 int snd_card_disconnect(struct snd_card *card)
391 struct snd_monitor_file *mfile;
396 spin_lock(&card->files_lock);
397 if (card->shutdown) {
398 spin_unlock(&card->files_lock);
402 spin_unlock(&card->files_lock);
404 /* replace file->f_op with special dummy operations */
405 spin_lock(&card->files_lock);
406 list_for_each_entry(mfile, &card->files_list, list) {
407 /* it's critical part, use endless loop */
408 /* we have no room to fail */
409 mfile->disconnected_f_op = mfile->file->f_op;
411 spin_lock(&shutdown_lock);
412 list_add(&mfile->shutdown_list, &shutdown_files);
413 spin_unlock(&shutdown_lock);
415 mfile->file->f_op = &snd_shutdown_f_ops;
416 fops_get(mfile->file->f_op);
418 spin_unlock(&card->files_lock);
420 /* notify all connected devices about disconnection */
421 /* at this point, they cannot respond to any calls except release() */
423 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
424 if (snd_mixer_oss_notify_callback)
425 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
428 /* notify all devices that we are disconnected */
429 snd_device_disconnect_all(card);
431 snd_info_card_disconnect(card);
432 if (card->registered) {
433 device_del(&card->card_dev);
434 card->registered = false;
437 /* disable fops (user space) operations for ALSA API */
438 mutex_lock(&snd_card_mutex);
439 snd_cards[card->number] = NULL;
440 clear_bit(card->number, snd_cards_lock);
441 mutex_unlock(&snd_card_mutex);
444 wake_up(&card->power_sleep);
448 EXPORT_SYMBOL(snd_card_disconnect);
451 * snd_card_disconnect_sync - disconnect card and wait until files get closed
452 * @card: card object to disconnect
454 * This calls snd_card_disconnect() for disconnecting all belonging components
455 * and waits until all pending files get closed.
456 * It assures that all accesses from user-space finished so that the driver
457 * can release its resources gracefully.
459 void snd_card_disconnect_sync(struct snd_card *card)
463 err = snd_card_disconnect(card);
466 "snd_card_disconnect error (%d), skipping sync\n",
471 spin_lock_irq(&card->files_lock);
472 wait_event_lock_irq(card->remove_sleep,
473 list_empty(&card->files_list),
475 spin_unlock_irq(&card->files_lock);
477 EXPORT_SYMBOL_GPL(snd_card_disconnect_sync);
479 static int snd_card_do_free(struct snd_card *card)
481 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
482 if (snd_mixer_oss_notify_callback)
483 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
485 snd_device_free_all(card);
486 if (card->private_free)
487 card->private_free(card);
488 if (snd_info_card_free(card) < 0) {
489 dev_warn(card->dev, "unable to free card info\n");
490 /* Not fatal error */
492 if (card->release_completion)
493 complete(card->release_completion);
499 * snd_card_free_when_closed - Disconnect the card, free it later eventually
500 * @card: soundcard structure
502 * Unlike snd_card_free(), this function doesn't try to release the card
503 * resource immediately, but tries to disconnect at first. When the card
504 * is still in use, the function returns before freeing the resources.
505 * The card resources will be freed when the refcount gets to zero.
507 int snd_card_free_when_closed(struct snd_card *card)
509 int ret = snd_card_disconnect(card);
512 put_device(&card->card_dev);
515 EXPORT_SYMBOL(snd_card_free_when_closed);
518 * snd_card_free - frees given soundcard structure
519 * @card: soundcard structure
521 * This function releases the soundcard structure and the all assigned
522 * devices automatically. That is, you don't have to release the devices
525 * This function waits until the all resources are properly released.
527 * Return: Zero. Frees all associated devices and frees the control
528 * interface associated to given soundcard.
530 int snd_card_free(struct snd_card *card)
532 struct completion released;
535 init_completion(&released);
536 card->release_completion = &released;
537 ret = snd_card_free_when_closed(card);
540 /* wait, until all devices are ready for the free operation */
541 wait_for_completion(&released);
544 EXPORT_SYMBOL(snd_card_free);
546 /* retrieve the last word of shortname or longname */
547 static const char *retrieve_id_from_card_name(const char *name)
549 const char *spos = name;
552 if (isspace(*name) && isalnum(name[1]))
559 /* return true if the given id string doesn't conflict any other card ids */
560 static bool card_id_ok(struct snd_card *card, const char *id)
563 if (!snd_info_check_reserved_words(id))
565 for (i = 0; i < snd_ecards_limit; i++) {
566 if (snd_cards[i] && snd_cards[i] != card &&
567 !strcmp(snd_cards[i]->id, id))
573 /* copy to card->id only with valid letters from nid */
574 static void copy_valid_id_string(struct snd_card *card, const char *src,
579 while (*nid && !isalnum(*nid))
582 *id++ = isalpha(*src) ? *src : 'D';
583 while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
591 /* Set card->id from the given string
592 * If the string conflicts with other ids, add a suffix to make it unique.
594 static void snd_card_set_id_no_lock(struct snd_card *card, const char *src,
598 bool is_default = false;
601 copy_valid_id_string(card, src, nid);
605 /* use "Default" for obviously invalid strings
606 * ("card" conflicts with proc directories)
608 if (!*id || !strncmp(id, "card", 4)) {
609 strcpy(id, "Default");
614 for (loops = 0; loops < SNDRV_CARDS; loops++) {
616 char sfxstr[5]; /* "_012" */
619 if (card_id_ok(card, id))
622 /* Add _XYZ suffix */
623 sprintf(sfxstr, "_%X", loops + 1);
624 sfxlen = strlen(sfxstr);
625 if (len + sfxlen >= sizeof(card->id))
626 spos = id + sizeof(card->id) - sfxlen - 1;
629 strcpy(spos, sfxstr);
631 /* fallback to the default id */
637 dev_err(card->dev, "unable to set card id (%s)\n", id);
638 if (card->proc_root->name)
639 strlcpy(card->id, card->proc_root->name, sizeof(card->id));
643 * snd_card_set_id - set card identification name
644 * @card: soundcard structure
645 * @nid: new identification string
647 * This function sets the card identification and checks for name
650 void snd_card_set_id(struct snd_card *card, const char *nid)
652 /* check if user specified own card->id */
653 if (card->id[0] != '\0')
655 mutex_lock(&snd_card_mutex);
656 snd_card_set_id_no_lock(card, nid, nid);
657 mutex_unlock(&snd_card_mutex);
659 EXPORT_SYMBOL(snd_card_set_id);
662 card_id_show_attr(struct device *dev,
663 struct device_attribute *attr, char *buf)
665 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
666 return scnprintf(buf, PAGE_SIZE, "%s\n", card->id);
670 card_id_store_attr(struct device *dev, struct device_attribute *attr,
671 const char *buf, size_t count)
673 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
674 char buf1[sizeof(card->id)];
675 size_t copy = count > sizeof(card->id) - 1 ?
676 sizeof(card->id) - 1 : count;
680 for (idx = 0; idx < copy; idx++) {
682 if (!isalnum(c) && c != '_' && c != '-')
685 memcpy(buf1, buf, copy);
687 mutex_lock(&snd_card_mutex);
688 if (!card_id_ok(NULL, buf1)) {
689 mutex_unlock(&snd_card_mutex);
692 strcpy(card->id, buf1);
693 snd_info_card_id_change(card);
694 mutex_unlock(&snd_card_mutex);
699 static DEVICE_ATTR(id, 0644, card_id_show_attr, card_id_store_attr);
702 card_number_show_attr(struct device *dev,
703 struct device_attribute *attr, char *buf)
705 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
706 return scnprintf(buf, PAGE_SIZE, "%i\n", card->number);
709 static DEVICE_ATTR(number, 0444, card_number_show_attr, NULL);
711 static struct attribute *card_dev_attrs[] = {
713 &dev_attr_number.attr,
717 static const struct attribute_group card_dev_attr_group = {
718 .attrs = card_dev_attrs,
722 * snd_card_add_dev_attr - Append a new sysfs attribute group to card
723 * @card: card instance
724 * @group: attribute group to append
726 int snd_card_add_dev_attr(struct snd_card *card,
727 const struct attribute_group *group)
731 /* loop for (arraysize-1) here to keep NULL at the last entry */
732 for (i = 0; i < ARRAY_SIZE(card->dev_groups) - 1; i++) {
733 if (!card->dev_groups[i]) {
734 card->dev_groups[i] = group;
739 dev_err(card->dev, "Too many groups assigned\n");
742 EXPORT_SYMBOL_GPL(snd_card_add_dev_attr);
745 * snd_card_register - register the soundcard
746 * @card: soundcard structure
748 * This function registers all the devices assigned to the soundcard.
749 * Until calling this, the ALSA control interface is blocked from the
750 * external accesses. Thus, you should call this function at the end
751 * of the initialization of the card.
753 * Return: Zero otherwise a negative error code if the registration failed.
755 int snd_card_register(struct snd_card *card)
759 if (snd_BUG_ON(!card))
762 if (!card->registered) {
763 err = device_add(&card->card_dev);
766 card->registered = true;
769 if ((err = snd_device_register_all(card)) < 0)
771 mutex_lock(&snd_card_mutex);
772 if (snd_cards[card->number]) {
773 /* already registered */
774 mutex_unlock(&snd_card_mutex);
775 return snd_info_card_register(card); /* register pending info */
778 /* make a unique id name from the given string */
779 char tmpid[sizeof(card->id)];
780 memcpy(tmpid, card->id, sizeof(card->id));
781 snd_card_set_id_no_lock(card, tmpid, tmpid);
783 /* create an id from either shortname or longname */
785 src = *card->shortname ? card->shortname : card->longname;
786 snd_card_set_id_no_lock(card, src,
787 retrieve_id_from_card_name(src));
789 snd_cards[card->number] = card;
790 mutex_unlock(&snd_card_mutex);
791 err = snd_info_card_register(card);
795 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
796 if (snd_mixer_oss_notify_callback)
797 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
801 EXPORT_SYMBOL(snd_card_register);
803 #ifdef CONFIG_SND_PROC_FS
804 static void snd_card_info_read(struct snd_info_entry *entry,
805 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, "%2i [%-15s]: %s - %s\n",
819 snd_iprintf(buffer, " %s\n",
822 mutex_unlock(&snd_card_mutex);
825 snd_iprintf(buffer, "--- no soundcards ---\n");
828 #ifdef CONFIG_SND_OSSEMUL
829 void snd_card_info_read_oss(struct snd_info_buffer *buffer)
832 struct snd_card *card;
834 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
835 mutex_lock(&snd_card_mutex);
836 if ((card = snd_cards[idx]) != NULL) {
838 snd_iprintf(buffer, "%s\n", card->longname);
840 mutex_unlock(&snd_card_mutex);
843 snd_iprintf(buffer, "--- no soundcards ---\n");
850 static void snd_card_module_info_read(struct snd_info_entry *entry,
851 struct snd_info_buffer *buffer)
854 struct snd_card *card;
856 for (idx = 0; idx < SNDRV_CARDS; idx++) {
857 mutex_lock(&snd_card_mutex);
858 if ((card = snd_cards[idx]) != NULL)
859 snd_iprintf(buffer, "%2i %s\n",
860 idx, card->module->name);
861 mutex_unlock(&snd_card_mutex);
866 int __init snd_card_info_init(void)
868 struct snd_info_entry *entry;
870 entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
873 entry->c.text.read = snd_card_info_read;
874 if (snd_info_register(entry) < 0)
875 return -ENOMEM; /* freed in error path */
878 entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
881 entry->c.text.read = snd_card_module_info_read;
882 if (snd_info_register(entry) < 0)
883 return -ENOMEM; /* freed in error path */
888 #endif /* CONFIG_SND_PROC_FS */
891 * snd_component_add - add a component string
892 * @card: soundcard structure
893 * @component: the component id string
895 * This function adds the component id string to the supported list.
896 * The component can be referred from the alsa-lib.
898 * Return: Zero otherwise a negative error code.
901 int snd_component_add(struct snd_card *card, const char *component)
904 int len = strlen(component);
906 ptr = strstr(card->components, component);
908 if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */
911 if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
915 if (card->components[0] != '\0')
916 strcat(card->components, " ");
917 strcat(card->components, component);
920 EXPORT_SYMBOL(snd_component_add);
923 * snd_card_file_add - add the file to the file list of the card
924 * @card: soundcard structure
925 * @file: file pointer
927 * This function adds the file to the file linked-list of the card.
928 * This linked-list is used to keep tracking the connection state,
929 * and to avoid the release of busy resources by hotplug.
931 * Return: zero or a negative error code.
933 int snd_card_file_add(struct snd_card *card, struct file *file)
935 struct snd_monitor_file *mfile;
937 mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
941 mfile->disconnected_f_op = NULL;
942 INIT_LIST_HEAD(&mfile->shutdown_list);
943 spin_lock(&card->files_lock);
944 if (card->shutdown) {
945 spin_unlock(&card->files_lock);
949 list_add(&mfile->list, &card->files_list);
950 get_device(&card->card_dev);
951 spin_unlock(&card->files_lock);
954 EXPORT_SYMBOL(snd_card_file_add);
957 * snd_card_file_remove - remove the file from the file list
958 * @card: soundcard structure
959 * @file: file pointer
961 * This function removes the file formerly added to the card via
962 * snd_card_file_add() function.
963 * If all files are removed and snd_card_free_when_closed() was
964 * called beforehand, it processes the pending release of
967 * Return: Zero or a negative error code.
969 int snd_card_file_remove(struct snd_card *card, struct file *file)
971 struct snd_monitor_file *mfile, *found = NULL;
973 spin_lock(&card->files_lock);
974 list_for_each_entry(mfile, &card->files_list, list) {
975 if (mfile->file == file) {
976 list_del(&mfile->list);
977 spin_lock(&shutdown_lock);
978 list_del(&mfile->shutdown_list);
979 spin_unlock(&shutdown_lock);
980 if (mfile->disconnected_f_op)
981 fops_put(mfile->disconnected_f_op);
986 if (list_empty(&card->files_list))
987 wake_up_all(&card->remove_sleep);
988 spin_unlock(&card->files_lock);
990 dev_err(card->dev, "card file remove problem (%p)\n", file);
994 put_device(&card->card_dev);
997 EXPORT_SYMBOL(snd_card_file_remove);
1001 * snd_power_wait - wait until the power-state is changed.
1002 * @card: soundcard structure
1003 * @power_state: expected power state
1005 * Waits until the power-state is changed.
1007 * Return: Zero if successful, or a negative error code.
1009 int snd_power_wait(struct snd_card *card, unsigned int power_state)
1011 wait_queue_entry_t wait;
1015 if (snd_power_get_state(card) == power_state)
1017 init_waitqueue_entry(&wait, current);
1018 add_wait_queue(&card->power_sleep, &wait);
1020 if (card->shutdown) {
1024 if (snd_power_get_state(card) == power_state)
1026 set_current_state(TASK_UNINTERRUPTIBLE);
1027 schedule_timeout(30 * HZ);
1029 remove_wait_queue(&card->power_sleep, &wait);
1032 EXPORT_SYMBOL(snd_power_wait);
1033 #endif /* CONFIG_PM */