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_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 inline int init_info_for_card(struct snd_card *card)
113 struct snd_info_entry *entry;
115 if ((err = snd_info_card_register(card)) < 0) {
116 dev_dbg(card->dev, "unable to create card info\n");
119 if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) {
120 dev_dbg(card->dev, "unable to create card entry\n");
123 entry->c.text.read = snd_card_id_read;
124 if (snd_info_register(entry) < 0) {
125 snd_info_free_entry(entry);
128 card->proc_id = entry;
131 #else /* !CONFIG_PROC_FS */
132 #define init_info_for_card(card)
135 static int check_empty_slot(struct module *module, int slot)
137 return !slots[slot] || !*slots[slot];
140 /* return an empty slot number (>= 0) found in the given bitmask @mask.
141 * @mask == -1 == 0xffffffff means: take any free slot up to 32
142 * when no slot is available, return the original @mask as is.
144 static int get_slot_from_bitmask(int mask, int (*check)(struct module *, int),
145 struct module *module)
149 for (slot = 0; slot < SNDRV_CARDS; slot++) {
150 if (slot < 32 && !(mask & (1U << slot)))
152 if (!test_bit(slot, snd_cards_lock)) {
153 if (check(module, slot))
154 return slot; /* found */
157 return mask; /* unchanged */
160 /* the default release callback set in snd_device_initialize() below;
161 * this is just NOP for now, as almost all jobs are already done in
162 * dev_free callback of snd_device chain instead.
164 static void default_release(struct device *dev)
169 * snd_device_initialize - Initialize struct device for sound devices
170 * @dev: device to initialize
171 * @card: card to assign, optional
173 void snd_device_initialize(struct device *dev, struct snd_card *card)
175 device_initialize(dev);
177 dev->parent = &card->card_dev;
178 dev->class = sound_class;
179 dev->release = default_release;
181 EXPORT_SYMBOL_GPL(snd_device_initialize);
183 static int snd_card_do_free(struct snd_card *card);
184 static const struct attribute_group card_dev_attr_group;
186 static void release_card_device(struct device *dev)
188 snd_card_do_free(dev_to_snd_card(dev));
192 * snd_card_new - create and initialize a soundcard structure
193 * @parent: the parent device object
194 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
195 * @xid: card identification (ASCII string)
196 * @module: top level module for locking
197 * @extra_size: allocate this extra size after the main soundcard structure
198 * @card_ret: the pointer to store the created card instance
200 * Creates and initializes a soundcard structure.
202 * The function allocates snd_card instance via kzalloc with the given
203 * space for the driver to use freely. The allocated struct is stored
204 * in the given card_ret pointer.
206 * Return: Zero if successful or a negative error code.
208 int snd_card_new(struct device *parent, int idx, const char *xid,
209 struct module *module, int extra_size,
210 struct snd_card **card_ret)
212 struct snd_card *card;
215 if (snd_BUG_ON(!card_ret))
221 card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
225 card->private_data = (char *)card + sizeof(struct snd_card);
227 strlcpy(card->id, xid, sizeof(card->id));
229 mutex_lock(&snd_card_mutex);
230 if (idx < 0) /* first check the matching module-name slot */
231 idx = get_slot_from_bitmask(idx, module_slot_match, module);
232 if (idx < 0) /* if not matched, assign an empty slot */
233 idx = get_slot_from_bitmask(idx, check_empty_slot, module);
236 else if (idx < snd_ecards_limit) {
237 if (test_bit(idx, snd_cards_lock))
238 err = -EBUSY; /* invalid */
239 } else if (idx >= SNDRV_CARDS)
242 mutex_unlock(&snd_card_mutex);
243 dev_err(parent, "cannot find the slot for index %d (range 0-%i), error: %d\n",
244 idx, snd_ecards_limit - 1, err);
248 set_bit(idx, snd_cards_lock); /* lock it */
249 if (idx >= snd_ecards_limit)
250 snd_ecards_limit = idx + 1; /* increase the limit */
251 mutex_unlock(&snd_card_mutex);
254 card->module = module;
255 INIT_LIST_HEAD(&card->devices);
256 init_rwsem(&card->controls_rwsem);
257 rwlock_init(&card->ctl_files_rwlock);
258 mutex_init(&card->user_ctl_lock);
259 INIT_LIST_HEAD(&card->controls);
260 INIT_LIST_HEAD(&card->ctl_files);
261 spin_lock_init(&card->files_lock);
262 INIT_LIST_HEAD(&card->files_list);
264 mutex_init(&card->power_lock);
265 init_waitqueue_head(&card->power_sleep);
268 device_initialize(&card->card_dev);
269 card->card_dev.parent = parent;
270 card->card_dev.class = sound_class;
271 card->card_dev.release = release_card_device;
272 card->card_dev.groups = card->dev_groups;
273 card->dev_groups[0] = &card_dev_attr_group;
274 err = kobject_set_name(&card->card_dev.kobj, "card%d", idx);
278 /* the control interface cannot be accessed from the user space until */
279 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
280 err = snd_ctl_create(card);
282 dev_err(parent, "unable to register control minors\n");
285 err = snd_info_card_create(card);
287 dev_err(parent, "unable to create card info\n");
294 snd_device_free_all(card);
296 put_device(&card->card_dev);
299 EXPORT_SYMBOL(snd_card_new);
301 /* return non-zero if a card is already locked */
302 int snd_card_locked(int card)
306 mutex_lock(&snd_card_mutex);
307 locked = test_bit(card, snd_cards_lock);
308 mutex_unlock(&snd_card_mutex);
312 static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
317 static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
318 size_t count, loff_t *offset)
323 static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
324 size_t count, loff_t *offset)
329 static int snd_disconnect_release(struct inode *inode, struct file *file)
331 struct snd_monitor_file *df = NULL, *_df;
333 spin_lock(&shutdown_lock);
334 list_for_each_entry(_df, &shutdown_files, shutdown_list) {
335 if (_df->file == file) {
337 list_del_init(&df->shutdown_list);
341 spin_unlock(&shutdown_lock);
344 if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync)
345 df->disconnected_f_op->fasync(-1, file, 0);
346 return df->disconnected_f_op->release(inode, file);
349 panic("%s(%p, %p) failed!", __func__, inode, file);
352 static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait)
354 return POLLERR | POLLNVAL;
357 static long snd_disconnect_ioctl(struct file *file,
358 unsigned int cmd, unsigned long arg)
363 static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
368 static int snd_disconnect_fasync(int fd, struct file *file, int on)
373 static const struct file_operations snd_shutdown_f_ops =
375 .owner = THIS_MODULE,
376 .llseek = snd_disconnect_llseek,
377 .read = snd_disconnect_read,
378 .write = snd_disconnect_write,
379 .release = snd_disconnect_release,
380 .poll = snd_disconnect_poll,
381 .unlocked_ioctl = snd_disconnect_ioctl,
383 .compat_ioctl = snd_disconnect_ioctl,
385 .mmap = snd_disconnect_mmap,
386 .fasync = snd_disconnect_fasync
390 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
391 * @card: soundcard structure
393 * Disconnects all APIs from the file-operations (user space).
395 * Return: Zero, otherwise a negative error code.
397 * Note: The current implementation replaces all active file->f_op with special
398 * dummy file operations (they do nothing except release).
400 int snd_card_disconnect(struct snd_card *card)
402 struct snd_monitor_file *mfile;
407 spin_lock(&card->files_lock);
408 if (card->shutdown) {
409 spin_unlock(&card->files_lock);
413 spin_unlock(&card->files_lock);
415 /* phase 1: disable fops (user space) operations for ALSA API */
416 mutex_lock(&snd_card_mutex);
417 snd_cards[card->number] = NULL;
418 clear_bit(card->number, snd_cards_lock);
419 mutex_unlock(&snd_card_mutex);
421 /* phase 2: replace file->f_op with special dummy operations */
423 spin_lock(&card->files_lock);
424 list_for_each_entry(mfile, &card->files_list, list) {
425 /* it's critical part, use endless loop */
426 /* we have no room to fail */
427 mfile->disconnected_f_op = mfile->file->f_op;
429 spin_lock(&shutdown_lock);
430 list_add(&mfile->shutdown_list, &shutdown_files);
431 spin_unlock(&shutdown_lock);
433 mfile->file->f_op = &snd_shutdown_f_ops;
434 fops_get(mfile->file->f_op);
436 spin_unlock(&card->files_lock);
438 /* phase 3: notify all connected devices about disconnection */
439 /* at this point, they cannot respond to any calls except release() */
441 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
442 if (snd_mixer_oss_notify_callback)
443 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
446 /* notify all devices that we are disconnected */
447 snd_device_disconnect_all(card);
449 snd_info_card_disconnect(card);
450 if (card->registered) {
451 device_del(&card->card_dev);
452 card->registered = false;
455 wake_up(&card->power_sleep);
460 EXPORT_SYMBOL(snd_card_disconnect);
462 static int snd_card_do_free(struct snd_card *card)
464 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
465 if (snd_mixer_oss_notify_callback)
466 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
468 snd_device_free_all(card);
469 if (card->private_free)
470 card->private_free(card);
471 snd_info_free_entry(card->proc_id);
472 if (snd_info_card_free(card) < 0) {
473 dev_warn(card->dev, "unable to free card info\n");
474 /* Not fatal error */
476 if (card->release_completion)
477 complete(card->release_completion);
483 * snd_card_free_when_closed - Disconnect the card, free it later eventually
484 * @card: soundcard structure
486 * Unlike snd_card_free(), this function doesn't try to release the card
487 * resource immediately, but tries to disconnect at first. When the card
488 * is still in use, the function returns before freeing the resources.
489 * The card resources will be freed when the refcount gets to zero.
491 int snd_card_free_when_closed(struct snd_card *card)
493 int ret = snd_card_disconnect(card);
496 put_device(&card->card_dev);
499 EXPORT_SYMBOL(snd_card_free_when_closed);
502 * snd_card_free - frees given soundcard structure
503 * @card: soundcard structure
505 * This function releases the soundcard structure and the all assigned
506 * devices automatically. That is, you don't have to release the devices
509 * This function waits until the all resources are properly released.
511 * Return: Zero. Frees all associated devices and frees the control
512 * interface associated to given soundcard.
514 int snd_card_free(struct snd_card *card)
516 struct completion released;
519 init_completion(&released);
520 card->release_completion = &released;
521 ret = snd_card_free_when_closed(card);
524 /* wait, until all devices are ready for the free operation */
525 wait_for_completion(&released);
528 EXPORT_SYMBOL(snd_card_free);
530 /* retrieve the last word of shortname or longname */
531 static const char *retrieve_id_from_card_name(const char *name)
533 const char *spos = name;
536 if (isspace(*name) && isalnum(name[1]))
543 /* return true if the given id string doesn't conflict any other card ids */
544 static bool card_id_ok(struct snd_card *card, const char *id)
547 if (!snd_info_check_reserved_words(id))
549 for (i = 0; i < snd_ecards_limit; i++) {
550 if (snd_cards[i] && snd_cards[i] != card &&
551 !strcmp(snd_cards[i]->id, id))
557 /* copy to card->id only with valid letters from nid */
558 static void copy_valid_id_string(struct snd_card *card, const char *src,
563 while (*nid && !isalnum(*nid))
566 *id++ = isalpha(*src) ? *src : 'D';
567 while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
575 /* Set card->id from the given string
576 * If the string conflicts with other ids, add a suffix to make it unique.
578 static void snd_card_set_id_no_lock(struct snd_card *card, const char *src,
582 bool is_default = false;
585 copy_valid_id_string(card, src, nid);
589 /* use "Default" for obviously invalid strings
590 * ("card" conflicts with proc directories)
592 if (!*id || !strncmp(id, "card", 4)) {
593 strcpy(id, "Default");
598 for (loops = 0; loops < SNDRV_CARDS; loops++) {
600 char sfxstr[5]; /* "_012" */
603 if (card_id_ok(card, id))
606 /* Add _XYZ suffix */
607 sprintf(sfxstr, "_%X", loops + 1);
608 sfxlen = strlen(sfxstr);
609 if (len + sfxlen >= sizeof(card->id))
610 spos = id + sizeof(card->id) - sfxlen - 1;
613 strcpy(spos, sfxstr);
615 /* fallback to the default id */
621 dev_err(card->dev, "unable to set card id (%s)\n", id);
622 if (card->proc_root->name)
623 strlcpy(card->id, card->proc_root->name, sizeof(card->id));
627 * snd_card_set_id - set card identification name
628 * @card: soundcard structure
629 * @nid: new identification string
631 * This function sets the card identification and checks for name
634 void snd_card_set_id(struct snd_card *card, const char *nid)
636 /* check if user specified own card->id */
637 if (card->id[0] != '\0')
639 mutex_lock(&snd_card_mutex);
640 snd_card_set_id_no_lock(card, nid, nid);
641 mutex_unlock(&snd_card_mutex);
643 EXPORT_SYMBOL(snd_card_set_id);
646 card_id_show_attr(struct device *dev,
647 struct device_attribute *attr, char *buf)
649 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
650 return snprintf(buf, PAGE_SIZE, "%s\n", card->id);
654 card_id_store_attr(struct device *dev, struct device_attribute *attr,
655 const char *buf, size_t count)
657 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
658 char buf1[sizeof(card->id)];
659 size_t copy = count > sizeof(card->id) - 1 ?
660 sizeof(card->id) - 1 : count;
664 for (idx = 0; idx < copy; idx++) {
666 if (!isalnum(c) && c != '_' && c != '-')
669 memcpy(buf1, buf, copy);
671 mutex_lock(&snd_card_mutex);
672 if (!card_id_ok(NULL, buf1)) {
673 mutex_unlock(&snd_card_mutex);
676 strcpy(card->id, buf1);
677 snd_info_card_id_change(card);
678 mutex_unlock(&snd_card_mutex);
683 static DEVICE_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 = container_of(dev, struct snd_card, card_dev);
690 return snprintf(buf, PAGE_SIZE, "%i\n", card->number);
693 static DEVICE_ATTR(number, S_IRUGO, card_number_show_attr, NULL);
695 static struct attribute *card_dev_attrs[] = {
697 &dev_attr_number.attr,
701 static const struct attribute_group card_dev_attr_group = {
702 .attrs = card_dev_attrs,
706 * snd_card_add_dev_attr - Append a new sysfs attribute group to card
707 * @card: card instance
708 * @group: attribute group to append
710 int snd_card_add_dev_attr(struct snd_card *card,
711 const struct attribute_group *group)
715 /* loop for (arraysize-1) here to keep NULL at the last entry */
716 for (i = 0; i < ARRAY_SIZE(card->dev_groups) - 1; i++) {
717 if (!card->dev_groups[i]) {
718 card->dev_groups[i] = group;
723 dev_err(card->dev, "Too many groups assigned\n");
726 EXPORT_SYMBOL_GPL(snd_card_add_dev_attr);
729 * snd_card_register - register the soundcard
730 * @card: soundcard structure
732 * This function registers all the devices assigned to the soundcard.
733 * Until calling this, the ALSA control interface is blocked from the
734 * external accesses. Thus, you should call this function at the end
735 * of the initialization of the card.
737 * Return: Zero otherwise a negative error code if the registration failed.
739 int snd_card_register(struct snd_card *card)
743 if (snd_BUG_ON(!card))
746 if (!card->registered) {
747 err = device_add(&card->card_dev);
750 card->registered = true;
753 if ((err = snd_device_register_all(card)) < 0)
755 mutex_lock(&snd_card_mutex);
756 if (snd_cards[card->number]) {
757 /* already registered */
758 mutex_unlock(&snd_card_mutex);
762 /* make a unique id name from the given string */
763 char tmpid[sizeof(card->id)];
764 memcpy(tmpid, card->id, sizeof(card->id));
765 snd_card_set_id_no_lock(card, tmpid, tmpid);
767 /* create an id from either shortname or longname */
769 src = *card->shortname ? card->shortname : card->longname;
770 snd_card_set_id_no_lock(card, src,
771 retrieve_id_from_card_name(src));
773 snd_cards[card->number] = card;
774 mutex_unlock(&snd_card_mutex);
775 init_info_for_card(card);
776 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
777 if (snd_mixer_oss_notify_callback)
778 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
783 EXPORT_SYMBOL(snd_card_register);
785 #ifdef CONFIG_PROC_FS
786 static struct snd_info_entry *snd_card_info_entry;
788 static void snd_card_info_read(struct snd_info_entry *entry,
789 struct snd_info_buffer *buffer)
792 struct snd_card *card;
794 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
795 mutex_lock(&snd_card_mutex);
796 if ((card = snd_cards[idx]) != NULL) {
798 snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
803 snd_iprintf(buffer, " %s\n",
806 mutex_unlock(&snd_card_mutex);
809 snd_iprintf(buffer, "--- no soundcards ---\n");
812 #ifdef CONFIG_SND_OSSEMUL
814 void snd_card_info_read_oss(struct snd_info_buffer *buffer)
817 struct snd_card *card;
819 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
820 mutex_lock(&snd_card_mutex);
821 if ((card = snd_cards[idx]) != NULL) {
823 snd_iprintf(buffer, "%s\n", card->longname);
825 mutex_unlock(&snd_card_mutex);
828 snd_iprintf(buffer, "--- no soundcards ---\n");
835 static struct snd_info_entry *snd_card_module_info_entry;
836 static void snd_card_module_info_read(struct snd_info_entry *entry,
837 struct snd_info_buffer *buffer)
840 struct snd_card *card;
842 for (idx = 0; idx < SNDRV_CARDS; idx++) {
843 mutex_lock(&snd_card_mutex);
844 if ((card = snd_cards[idx]) != NULL)
845 snd_iprintf(buffer, "%2i %s\n",
846 idx, card->module->name);
847 mutex_unlock(&snd_card_mutex);
852 int __init snd_card_info_init(void)
854 struct snd_info_entry *entry;
856 entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
859 entry->c.text.read = snd_card_info_read;
860 if (snd_info_register(entry) < 0) {
861 snd_info_free_entry(entry);
864 snd_card_info_entry = entry;
867 entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
869 entry->c.text.read = snd_card_module_info_read;
870 if (snd_info_register(entry) < 0)
871 snd_info_free_entry(entry);
873 snd_card_module_info_entry = entry;
880 int __exit snd_card_info_done(void)
882 snd_info_free_entry(snd_card_info_entry);
884 snd_info_free_entry(snd_card_module_info_entry);
889 #endif /* CONFIG_PROC_FS */
892 * snd_component_add - add a component string
893 * @card: soundcard structure
894 * @component: the component id string
896 * This function adds the component id string to the supported list.
897 * The component can be referred from the alsa-lib.
899 * Return: Zero otherwise a negative error code.
902 int snd_component_add(struct snd_card *card, const char *component)
905 int len = strlen(component);
907 ptr = strstr(card->components, component);
909 if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */
912 if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
916 if (card->components[0] != '\0')
917 strcat(card->components, " ");
918 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);
957 EXPORT_SYMBOL(snd_card_file_add);
960 * snd_card_file_remove - remove the file from the file list
961 * @card: soundcard structure
962 * @file: file pointer
964 * This function removes the file formerly added to the card via
965 * snd_card_file_add() function.
966 * If all files are removed and snd_card_free_when_closed() was
967 * called beforehand, it processes the pending release of
970 * Return: Zero or a negative error code.
972 int snd_card_file_remove(struct snd_card *card, struct file *file)
974 struct snd_monitor_file *mfile, *found = NULL;
976 spin_lock(&card->files_lock);
977 list_for_each_entry(mfile, &card->files_list, list) {
978 if (mfile->file == file) {
979 list_del(&mfile->list);
980 spin_lock(&shutdown_lock);
981 list_del(&mfile->shutdown_list);
982 spin_unlock(&shutdown_lock);
983 if (mfile->disconnected_f_op)
984 fops_put(mfile->disconnected_f_op);
989 spin_unlock(&card->files_lock);
991 dev_err(card->dev, "card file remove problem (%p)\n", file);
995 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 * Note: the power lock must be active before call.
1013 int snd_power_wait(struct snd_card *card, unsigned int power_state)
1019 if (snd_power_get_state(card) == power_state)
1021 init_waitqueue_entry(&wait, current);
1022 add_wait_queue(&card->power_sleep, &wait);
1024 if (card->shutdown) {
1028 if (snd_power_get_state(card) == power_state)
1030 set_current_state(TASK_UNINTERRUPTIBLE);
1031 snd_power_unlock(card);
1032 schedule_timeout(30 * HZ);
1033 snd_power_lock(card);
1035 remove_wait_queue(&card->power_sleep, &wait);
1039 EXPORT_SYMBOL(snd_power_wait);
1040 #endif /* CONFIG_PM */