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);
258 init_waitqueue_head(&card->remove_sleep);
260 device_initialize(&card->card_dev);
261 card->card_dev.parent = parent;
262 card->card_dev.class = sound_class;
263 card->card_dev.release = release_card_device;
264 card->card_dev.groups = card->dev_groups;
265 card->dev_groups[0] = &card_dev_attr_group;
266 err = kobject_set_name(&card->card_dev.kobj, "card%d", idx);
270 snprintf(card->irq_descr, sizeof(card->irq_descr), "%s:%s",
271 dev_driver_string(card->dev), dev_name(&card->card_dev));
273 /* the control interface cannot be accessed from the user space until */
274 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
275 err = snd_ctl_create(card);
277 dev_err(parent, "unable to register control minors\n");
280 err = snd_info_card_create(card);
282 dev_err(parent, "unable to create card info\n");
289 snd_device_free_all(card);
291 put_device(&card->card_dev);
294 EXPORT_SYMBOL(snd_card_new);
296 /* return non-zero if a card is already locked */
297 int snd_card_locked(int card)
301 mutex_lock(&snd_card_mutex);
302 locked = test_bit(card, snd_cards_lock);
303 mutex_unlock(&snd_card_mutex);
307 static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
312 static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
313 size_t count, loff_t *offset)
318 static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
319 size_t count, loff_t *offset)
324 static int snd_disconnect_release(struct inode *inode, struct file *file)
326 struct snd_monitor_file *df = NULL, *_df;
328 spin_lock(&shutdown_lock);
329 list_for_each_entry(_df, &shutdown_files, shutdown_list) {
330 if (_df->file == file) {
332 list_del_init(&df->shutdown_list);
336 spin_unlock(&shutdown_lock);
339 if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync)
340 df->disconnected_f_op->fasync(-1, file, 0);
341 return df->disconnected_f_op->release(inode, file);
344 panic("%s(%p, %p) failed!", __func__, inode, file);
347 static __poll_t snd_disconnect_poll(struct file * file, poll_table * wait)
349 return EPOLLERR | EPOLLNVAL;
352 static long snd_disconnect_ioctl(struct file *file,
353 unsigned int cmd, unsigned long arg)
358 static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
363 static int snd_disconnect_fasync(int fd, struct file *file, int on)
368 static const struct file_operations snd_shutdown_f_ops =
370 .owner = THIS_MODULE,
371 .llseek = snd_disconnect_llseek,
372 .read = snd_disconnect_read,
373 .write = snd_disconnect_write,
374 .release = snd_disconnect_release,
375 .poll = snd_disconnect_poll,
376 .unlocked_ioctl = snd_disconnect_ioctl,
378 .compat_ioctl = snd_disconnect_ioctl,
380 .mmap = snd_disconnect_mmap,
381 .fasync = snd_disconnect_fasync
385 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
386 * @card: soundcard structure
388 * Disconnects all APIs from the file-operations (user space).
390 * Return: Zero, otherwise a negative error code.
392 * Note: The current implementation replaces all active file->f_op with special
393 * dummy file operations (they do nothing except release).
395 int snd_card_disconnect(struct snd_card *card)
397 struct snd_monitor_file *mfile;
402 spin_lock(&card->files_lock);
403 if (card->shutdown) {
404 spin_unlock(&card->files_lock);
409 /* replace file->f_op with special dummy operations */
410 list_for_each_entry(mfile, &card->files_list, list) {
411 /* it's critical part, use endless loop */
412 /* we have no room to fail */
413 mfile->disconnected_f_op = mfile->file->f_op;
415 spin_lock(&shutdown_lock);
416 list_add(&mfile->shutdown_list, &shutdown_files);
417 spin_unlock(&shutdown_lock);
419 mfile->file->f_op = &snd_shutdown_f_ops;
420 fops_get(mfile->file->f_op);
422 spin_unlock(&card->files_lock);
424 /* notify all connected devices about disconnection */
425 /* at this point, they cannot respond to any calls except release() */
427 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
428 if (snd_mixer_oss_notify_callback)
429 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
432 /* notify all devices that we are disconnected */
433 snd_device_disconnect_all(card);
435 snd_info_card_disconnect(card);
436 if (card->registered) {
437 device_del(&card->card_dev);
438 card->registered = false;
441 /* disable fops (user space) operations for ALSA API */
442 mutex_lock(&snd_card_mutex);
443 snd_cards[card->number] = NULL;
444 clear_bit(card->number, snd_cards_lock);
445 mutex_unlock(&snd_card_mutex);
448 wake_up(&card->power_sleep);
452 EXPORT_SYMBOL(snd_card_disconnect);
455 * snd_card_disconnect_sync - disconnect card and wait until files get closed
456 * @card: card object to disconnect
458 * This calls snd_card_disconnect() for disconnecting all belonging components
459 * and waits until all pending files get closed.
460 * It assures that all accesses from user-space finished so that the driver
461 * can release its resources gracefully.
463 void snd_card_disconnect_sync(struct snd_card *card)
467 err = snd_card_disconnect(card);
470 "snd_card_disconnect error (%d), skipping sync\n",
475 spin_lock_irq(&card->files_lock);
476 wait_event_lock_irq(card->remove_sleep,
477 list_empty(&card->files_list),
479 spin_unlock_irq(&card->files_lock);
481 EXPORT_SYMBOL_GPL(snd_card_disconnect_sync);
483 static int snd_card_do_free(struct snd_card *card)
485 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
486 if (snd_mixer_oss_notify_callback)
487 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
489 snd_device_free_all(card);
490 if (card->private_free)
491 card->private_free(card);
492 snd_info_free_entry(card->proc_id);
493 if (snd_info_card_free(card) < 0) {
494 dev_warn(card->dev, "unable to free card info\n");
495 /* Not fatal error */
497 if (card->release_completion)
498 complete(card->release_completion);
504 * snd_card_free_when_closed - Disconnect the card, free it later eventually
505 * @card: soundcard structure
507 * Unlike snd_card_free(), this function doesn't try to release the card
508 * resource immediately, but tries to disconnect at first. When the card
509 * is still in use, the function returns before freeing the resources.
510 * The card resources will be freed when the refcount gets to zero.
512 int snd_card_free_when_closed(struct snd_card *card)
514 int ret = snd_card_disconnect(card);
517 put_device(&card->card_dev);
520 EXPORT_SYMBOL(snd_card_free_when_closed);
523 * snd_card_free - frees given soundcard structure
524 * @card: soundcard structure
526 * This function releases the soundcard structure and the all assigned
527 * devices automatically. That is, you don't have to release the devices
530 * This function waits until the all resources are properly released.
532 * Return: Zero. Frees all associated devices and frees the control
533 * interface associated to given soundcard.
535 int snd_card_free(struct snd_card *card)
537 struct completion released;
540 init_completion(&released);
541 card->release_completion = &released;
542 ret = snd_card_free_when_closed(card);
545 /* wait, until all devices are ready for the free operation */
546 wait_for_completion(&released);
549 EXPORT_SYMBOL(snd_card_free);
551 /* retrieve the last word of shortname or longname */
552 static const char *retrieve_id_from_card_name(const char *name)
554 const char *spos = name;
557 if (isspace(*name) && isalnum(name[1]))
564 /* return true if the given id string doesn't conflict any other card ids */
565 static bool card_id_ok(struct snd_card *card, const char *id)
568 if (!snd_info_check_reserved_words(id))
570 for (i = 0; i < snd_ecards_limit; i++) {
571 if (snd_cards[i] && snd_cards[i] != card &&
572 !strcmp(snd_cards[i]->id, id))
578 /* copy to card->id only with valid letters from nid */
579 static void copy_valid_id_string(struct snd_card *card, const char *src,
584 while (*nid && !isalnum(*nid))
587 *id++ = isalpha(*src) ? *src : 'D';
588 while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
596 /* Set card->id from the given string
597 * If the string conflicts with other ids, add a suffix to make it unique.
599 static void snd_card_set_id_no_lock(struct snd_card *card, const char *src,
603 bool is_default = false;
606 copy_valid_id_string(card, src, nid);
610 /* use "Default" for obviously invalid strings
611 * ("card" conflicts with proc directories)
613 if (!*id || !strncmp(id, "card", 4)) {
614 strcpy(id, "Default");
619 for (loops = 0; loops < SNDRV_CARDS; loops++) {
621 char sfxstr[5]; /* "_012" */
624 if (card_id_ok(card, id))
627 /* Add _XYZ suffix */
628 sprintf(sfxstr, "_%X", loops + 1);
629 sfxlen = strlen(sfxstr);
630 if (len + sfxlen >= sizeof(card->id))
631 spos = id + sizeof(card->id) - sfxlen - 1;
634 strcpy(spos, sfxstr);
636 /* fallback to the default id */
642 dev_err(card->dev, "unable to set card id (%s)\n", id);
643 if (card->proc_root->name)
644 strlcpy(card->id, card->proc_root->name, sizeof(card->id));
648 * snd_card_set_id - set card identification name
649 * @card: soundcard structure
650 * @nid: new identification string
652 * This function sets the card identification and checks for name
655 void snd_card_set_id(struct snd_card *card, const char *nid)
657 /* check if user specified own card->id */
658 if (card->id[0] != '\0')
660 mutex_lock(&snd_card_mutex);
661 snd_card_set_id_no_lock(card, nid, nid);
662 mutex_unlock(&snd_card_mutex);
664 EXPORT_SYMBOL(snd_card_set_id);
667 card_id_show_attr(struct device *dev,
668 struct device_attribute *attr, char *buf)
670 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
671 return scnprintf(buf, PAGE_SIZE, "%s\n", card->id);
675 card_id_store_attr(struct device *dev, struct device_attribute *attr,
676 const char *buf, size_t count)
678 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
679 char buf1[sizeof(card->id)];
680 size_t copy = count > sizeof(card->id) - 1 ?
681 sizeof(card->id) - 1 : count;
685 for (idx = 0; idx < copy; idx++) {
687 if (!isalnum(c) && c != '_' && c != '-')
690 memcpy(buf1, buf, copy);
692 mutex_lock(&snd_card_mutex);
693 if (!card_id_ok(NULL, buf1)) {
694 mutex_unlock(&snd_card_mutex);
697 strcpy(card->id, buf1);
698 snd_info_card_id_change(card);
699 mutex_unlock(&snd_card_mutex);
704 static DEVICE_ATTR(id, 0644, card_id_show_attr, card_id_store_attr);
707 card_number_show_attr(struct device *dev,
708 struct device_attribute *attr, char *buf)
710 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
711 return scnprintf(buf, PAGE_SIZE, "%i\n", card->number);
714 static DEVICE_ATTR(number, 0444, card_number_show_attr, NULL);
716 static struct attribute *card_dev_attrs[] = {
718 &dev_attr_number.attr,
722 static const struct attribute_group card_dev_attr_group = {
723 .attrs = card_dev_attrs,
727 * snd_card_add_dev_attr - Append a new sysfs attribute group to card
728 * @card: card instance
729 * @group: attribute group to append
731 int snd_card_add_dev_attr(struct snd_card *card,
732 const struct attribute_group *group)
736 /* loop for (arraysize-1) here to keep NULL at the last entry */
737 for (i = 0; i < ARRAY_SIZE(card->dev_groups) - 1; i++) {
738 if (!card->dev_groups[i]) {
739 card->dev_groups[i] = group;
744 dev_err(card->dev, "Too many groups assigned\n");
747 EXPORT_SYMBOL_GPL(snd_card_add_dev_attr);
750 * snd_card_register - register the soundcard
751 * @card: soundcard structure
753 * This function registers all the devices assigned to the soundcard.
754 * Until calling this, the ALSA control interface is blocked from the
755 * external accesses. Thus, you should call this function at the end
756 * of the initialization of the card.
758 * Return: Zero otherwise a negative error code if the registration failed.
760 int snd_card_register(struct snd_card *card)
764 if (snd_BUG_ON(!card))
767 if (!card->registered) {
768 err = device_add(&card->card_dev);
771 card->registered = true;
774 if ((err = snd_device_register_all(card)) < 0)
776 mutex_lock(&snd_card_mutex);
777 if (snd_cards[card->number]) {
778 /* already registered */
779 mutex_unlock(&snd_card_mutex);
780 return snd_info_card_register(card); /* register pending info */
783 /* make a unique id name from the given string */
784 char tmpid[sizeof(card->id)];
785 memcpy(tmpid, card->id, sizeof(card->id));
786 snd_card_set_id_no_lock(card, tmpid, tmpid);
788 /* create an id from either shortname or longname */
790 src = *card->shortname ? card->shortname : card->longname;
791 snd_card_set_id_no_lock(card, src,
792 retrieve_id_from_card_name(src));
794 snd_cards[card->number] = card;
795 mutex_unlock(&snd_card_mutex);
796 init_info_for_card(card);
797 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
798 if (snd_mixer_oss_notify_callback)
799 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
803 EXPORT_SYMBOL(snd_card_register);
805 #ifdef CONFIG_SND_PROC_FS
806 static void snd_card_info_read(struct snd_info_entry *entry,
807 struct snd_info_buffer *buffer)
810 struct snd_card *card;
812 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
813 mutex_lock(&snd_card_mutex);
814 if ((card = snd_cards[idx]) != NULL) {
816 snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
821 snd_iprintf(buffer, " %s\n",
824 mutex_unlock(&snd_card_mutex);
827 snd_iprintf(buffer, "--- no soundcards ---\n");
830 #ifdef CONFIG_SND_OSSEMUL
831 void snd_card_info_read_oss(struct snd_info_buffer *buffer)
834 struct snd_card *card;
836 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
837 mutex_lock(&snd_card_mutex);
838 if ((card = snd_cards[idx]) != NULL) {
840 snd_iprintf(buffer, "%s\n", card->longname);
842 mutex_unlock(&snd_card_mutex);
845 snd_iprintf(buffer, "--- no soundcards ---\n");
852 static void snd_card_module_info_read(struct snd_info_entry *entry,
853 struct snd_info_buffer *buffer)
856 struct snd_card *card;
858 for (idx = 0; idx < SNDRV_CARDS; idx++) {
859 mutex_lock(&snd_card_mutex);
860 if ((card = snd_cards[idx]) != NULL)
861 snd_iprintf(buffer, "%2i %s\n",
862 idx, card->module->name);
863 mutex_unlock(&snd_card_mutex);
868 int __init snd_card_info_init(void)
870 struct snd_info_entry *entry;
872 entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
875 entry->c.text.read = snd_card_info_read;
876 if (snd_info_register(entry) < 0)
877 return -ENOMEM; /* freed in error path */
880 entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
883 entry->c.text.read = snd_card_module_info_read;
884 if (snd_info_register(entry) < 0)
885 return -ENOMEM; /* freed in error path */
890 #endif /* CONFIG_SND_PROC_FS */
893 * snd_component_add - add a component string
894 * @card: soundcard structure
895 * @component: the component id string
897 * This function adds the component id string to the supported list.
898 * The component can be referred from the alsa-lib.
900 * Return: Zero otherwise a negative error code.
903 int snd_component_add(struct snd_card *card, const char *component)
906 int len = strlen(component);
908 ptr = strstr(card->components, component);
910 if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */
913 if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
917 if (card->components[0] != '\0')
918 strcat(card->components, " ");
919 strcat(card->components, component);
922 EXPORT_SYMBOL(snd_component_add);
925 * snd_card_file_add - add the file to the file list of the card
926 * @card: soundcard structure
927 * @file: file pointer
929 * This function adds the file to the file linked-list of the card.
930 * This linked-list is used to keep tracking the connection state,
931 * and to avoid the release of busy resources by hotplug.
933 * Return: zero or a negative error code.
935 int snd_card_file_add(struct snd_card *card, struct file *file)
937 struct snd_monitor_file *mfile;
939 mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
943 mfile->disconnected_f_op = NULL;
944 INIT_LIST_HEAD(&mfile->shutdown_list);
945 spin_lock(&card->files_lock);
946 if (card->shutdown) {
947 spin_unlock(&card->files_lock);
951 list_add(&mfile->list, &card->files_list);
952 get_device(&card->card_dev);
953 spin_unlock(&card->files_lock);
956 EXPORT_SYMBOL(snd_card_file_add);
959 * snd_card_file_remove - remove the file from the file list
960 * @card: soundcard structure
961 * @file: file pointer
963 * This function removes the file formerly added to the card via
964 * snd_card_file_add() function.
965 * If all files are removed and snd_card_free_when_closed() was
966 * called beforehand, it processes the pending release of
969 * Return: Zero or a negative error code.
971 int snd_card_file_remove(struct snd_card *card, struct file *file)
973 struct snd_monitor_file *mfile, *found = NULL;
975 spin_lock(&card->files_lock);
976 list_for_each_entry(mfile, &card->files_list, list) {
977 if (mfile->file == file) {
978 list_del(&mfile->list);
979 spin_lock(&shutdown_lock);
980 list_del(&mfile->shutdown_list);
981 spin_unlock(&shutdown_lock);
982 if (mfile->disconnected_f_op)
983 fops_put(mfile->disconnected_f_op);
988 if (list_empty(&card->files_list))
989 wake_up_all(&card->remove_sleep);
990 spin_unlock(&card->files_lock);
992 dev_err(card->dev, "card file remove problem (%p)\n", file);
996 put_device(&card->card_dev);
999 EXPORT_SYMBOL(snd_card_file_remove);
1003 * snd_power_wait - wait until the power-state is changed.
1004 * @card: soundcard structure
1005 * @power_state: expected power state
1007 * Waits until the power-state is changed.
1009 * Return: Zero if successful, or a negative error code.
1011 int snd_power_wait(struct snd_card *card, unsigned int power_state)
1013 wait_queue_entry_t wait;
1017 if (snd_power_get_state(card) == power_state)
1019 init_waitqueue_entry(&wait, current);
1020 add_wait_queue(&card->power_sleep, &wait);
1022 if (card->shutdown) {
1026 if (snd_power_get_state(card) == power_state)
1028 set_current_state(TASK_UNINTERRUPTIBLE);
1029 schedule_timeout(30 * HZ);
1031 remove_wait_queue(&card->power_sleep, &wait);
1034 EXPORT_SYMBOL(snd_power_wait);
1035 #endif /* CONFIG_PM */