--- /dev/null
+/*
+ * Initialization routines
+ * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/file.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/ctype.h>
+#include <linux/pm.h>
+#include <linux/completion.h>
+
+#include <sound/core.h>
+#include <sound/control.h>
+#include <sound/info.h>
+
+/* monitor files for graceful shutdown (hotplug) */
+struct snd_monitor_file {
+ struct file *file;
+ const struct file_operations *disconnected_f_op;
+ struct list_head shutdown_list; /* still need to shutdown */
+ struct list_head list; /* link of monitor files */
+};
+
+static DEFINE_SPINLOCK(shutdown_lock);
+static LIST_HEAD(shutdown_files);
+
+static const struct file_operations snd_shutdown_f_ops;
+
+/* locked for registering/using */
+static DECLARE_BITMAP(snd_cards_lock, SNDRV_CARDS);
+struct snd_card *snd_cards[SNDRV_CARDS];
+EXPORT_SYMBOL(snd_cards);
+
+static DEFINE_MUTEX(snd_card_mutex);
+
+static char *slots[SNDRV_CARDS];
+module_param_array(slots, charp, NULL, 0444);
+MODULE_PARM_DESC(slots, "Module names assigned to the slots.");
+
+/* return non-zero if the given index is reserved for the given
+ * module via slots option
+ */
+static int module_slot_match(struct module *module, int idx)
+{
+ int match = 1;
+#ifdef MODULE
+ const char *s1, *s2;
+
+ if (!module || !*module->name || !slots[idx])
+ return 0;
+
+ s1 = module->name;
+ s2 = slots[idx];
+ if (*s2 == '!') {
+ match = 0; /* negative match */
+ s2++;
+ }
+ /* compare module name strings
+ * hyphens are handled as equivalent with underscore
+ */
+ for (;;) {
+ char c1 = *s1++;
+ char c2 = *s2++;
+ if (c1 == '-')
+ c1 = '_';
+ if (c2 == '-')
+ c2 = '_';
+ if (c1 != c2)
+ return !match;
+ if (!c1)
+ break;
+ }
+#endif /* MODULE */
+ return match;
+}
+
+#if IS_ENABLED(CONFIG_SND_MIXER_OSS)
+int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag);
+EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
+#endif
+
+#ifdef CONFIG_PROC_FS
+static void snd_card_id_read(struct snd_info_entry *entry,
+ struct snd_info_buffer *buffer)
+{
+ snd_iprintf(buffer, "%s\n", entry->card->id);
+}
+
+static inline int init_info_for_card(struct snd_card *card)
+{
+ int err;
+ struct snd_info_entry *entry;
+
+ if ((err = snd_info_card_register(card)) < 0) {
+ dev_dbg(card->dev, "unable to create card info\n");
+ return err;
+ }
+ if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) {
+ dev_dbg(card->dev, "unable to create card entry\n");
+ return err;
+ }
+ entry->c.text.read = snd_card_id_read;
+ if (snd_info_register(entry) < 0) {
+ snd_info_free_entry(entry);
+ entry = NULL;
+ }
+ card->proc_id = entry;
+ return 0;
+}
+#else /* !CONFIG_PROC_FS */
+#define init_info_for_card(card)
+#endif
+
+static int check_empty_slot(struct module *module, int slot)
+{
+ return !slots[slot] || !*slots[slot];
+}
+
+/* return an empty slot number (>= 0) found in the given bitmask @mask.
+ * @mask == -1 == 0xffffffff means: take any free slot up to 32
+ * when no slot is available, return the original @mask as is.
+ */
+static int get_slot_from_bitmask(int mask, int (*check)(struct module *, int),
+ struct module *module)
+{
+ int slot;
+
+ for (slot = 0; slot < SNDRV_CARDS; slot++) {
+ if (slot < 32 && !(mask & (1U << slot)))
+ continue;
+ if (!test_bit(slot, snd_cards_lock)) {
+ if (check(module, slot))
+ return slot; /* found */
+ }
+ }
+ return mask; /* unchanged */
+}
+
+/* the default release callback set in snd_device_initialize() below;
+ * this is just NOP for now, as almost all jobs are already done in
+ * dev_free callback of snd_device chain instead.
+ */
+static void default_release(struct device *dev)
+{
+}
+
+/**
+ * snd_device_initialize - Initialize struct device for sound devices
+ * @dev: device to initialize
+ * @card: card to assign, optional
+ */
+void snd_device_initialize(struct device *dev, struct snd_card *card)
+{
+ device_initialize(dev);
+ if (card)
+ dev->parent = &card->card_dev;
+ dev->class = sound_class;
+ dev->release = default_release;
+}
+EXPORT_SYMBOL_GPL(snd_device_initialize);
+
+static int snd_card_do_free(struct snd_card *card);
+static const struct attribute_group card_dev_attr_group;
+
+static void release_card_device(struct device *dev)
+{
+ snd_card_do_free(dev_to_snd_card(dev));
+}
+
+/**
+ * snd_card_new - create and initialize a soundcard structure
+ * @parent: the parent device object
+ * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
+ * @xid: card identification (ASCII string)
+ * @module: top level module for locking
+ * @extra_size: allocate this extra size after the main soundcard structure
+ * @card_ret: the pointer to store the created card instance
+ *
+ * Creates and initializes a soundcard structure.
+ *
+ * The function allocates snd_card instance via kzalloc with the given
+ * space for the driver to use freely. The allocated struct is stored
+ * in the given card_ret pointer.
+ *
+ * Return: Zero if successful or a negative error code.
+ */
+int snd_card_new(struct device *parent, int idx, const char *xid,
+ struct module *module, int extra_size,
+ struct snd_card **card_ret)
+{
+ struct snd_card *card;
+ int err;
+
+ if (snd_BUG_ON(!card_ret))
+ return -EINVAL;
+ *card_ret = NULL;
+
+ if (extra_size < 0)
+ extra_size = 0;
+ card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
+ if (!card)
+ return -ENOMEM;
+ if (extra_size > 0)
+ card->private_data = (char *)card + sizeof(struct snd_card);
+ if (xid)
+ strlcpy(card->id, xid, sizeof(card->id));
+ err = 0;
+ mutex_lock(&snd_card_mutex);
+ if (idx < 0) /* first check the matching module-name slot */
+ idx = get_slot_from_bitmask(idx, module_slot_match, module);
+ if (idx < 0) /* if not matched, assign an empty slot */
+ idx = get_slot_from_bitmask(idx, check_empty_slot, module);
+ if (idx < 0)
+ err = -ENODEV;
+ else if (idx < snd_ecards_limit) {
+ if (test_bit(idx, snd_cards_lock))
+ err = -EBUSY; /* invalid */
+ } else if (idx >= SNDRV_CARDS)
+ err = -ENODEV;
+ if (err < 0) {
+ mutex_unlock(&snd_card_mutex);
+ dev_err(parent, "cannot find the slot for index %d (range 0-%i), error: %d\n",
+ idx, snd_ecards_limit - 1, err);
+ kfree(card);
+ return err;
+ }
+ set_bit(idx, snd_cards_lock); /* lock it */
+ if (idx >= snd_ecards_limit)
+ snd_ecards_limit = idx + 1; /* increase the limit */
+ mutex_unlock(&snd_card_mutex);
+ card->dev = parent;
+ card->number = idx;
+ card->module = module;
+ INIT_LIST_HEAD(&card->devices);
+ init_rwsem(&card->controls_rwsem);
+ rwlock_init(&card->ctl_files_rwlock);
+ mutex_init(&card->user_ctl_lock);
+ INIT_LIST_HEAD(&card->controls);
+ INIT_LIST_HEAD(&card->ctl_files);
+ spin_lock_init(&card->files_lock);
+ INIT_LIST_HEAD(&card->files_list);
+#ifdef CONFIG_PM
+ mutex_init(&card->power_lock);
+ init_waitqueue_head(&card->power_sleep);
+#endif
+
+ device_initialize(&card->card_dev);
+ card->card_dev.parent = parent;
+ card->card_dev.class = sound_class;
+ card->card_dev.release = release_card_device;
+ card->card_dev.groups = card->dev_groups;
+ card->dev_groups[0] = &card_dev_attr_group;
+ err = kobject_set_name(&card->card_dev.kobj, "card%d", idx);
+ if (err < 0)
+ goto __error;
+
+ /* the control interface cannot be accessed from the user space until */
+ /* snd_cards_bitmask and snd_cards are set with snd_card_register */
+ err = snd_ctl_create(card);
+ if (err < 0) {
+ dev_err(parent, "unable to register control minors\n");
+ goto __error;
+ }
+ err = snd_info_card_create(card);
+ if (err < 0) {
+ dev_err(parent, "unable to create card info\n");
+ goto __error_ctl;
+ }
+ *card_ret = card;
+ return 0;
+
+ __error_ctl:
+ snd_device_free_all(card);
+ __error:
+ put_device(&card->card_dev);
+ return err;
+}
+EXPORT_SYMBOL(snd_card_new);
+
+/* return non-zero if a card is already locked */
+int snd_card_locked(int card)
+{
+ int locked;
+
+ mutex_lock(&snd_card_mutex);
+ locked = test_bit(card, snd_cards_lock);
+ mutex_unlock(&snd_card_mutex);
+ return locked;
+}
+
+static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
+{
+ return -ENODEV;
+}
+
+static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
+ size_t count, loff_t *offset)
+{
+ return -ENODEV;
+}
+
+static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *offset)
+{
+ return -ENODEV;
+}
+
+static int snd_disconnect_release(struct inode *inode, struct file *file)
+{
+ struct snd_monitor_file *df = NULL, *_df;
+
+ spin_lock(&shutdown_lock);
+ list_for_each_entry(_df, &shutdown_files, shutdown_list) {
+ if (_df->file == file) {
+ df = _df;
+ list_del_init(&df->shutdown_list);
+ break;
+ }
+ }
+ spin_unlock(&shutdown_lock);
+
+ if (likely(df)) {
+ if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync)
+ df->disconnected_f_op->fasync(-1, file, 0);
+ return df->disconnected_f_op->release(inode, file);
+ }
+
+ panic("%s(%p, %p) failed!", __func__, inode, file);
+}
+
+static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait)
+{
+ return POLLERR | POLLNVAL;
+}
+
+static long snd_disconnect_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ return -ENODEV;
+}
+
+static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ return -ENODEV;
+}
+
+static int snd_disconnect_fasync(int fd, struct file *file, int on)
+{
+ return -ENODEV;
+}
+
+static const struct file_operations snd_shutdown_f_ops =
+{
+ .owner = THIS_MODULE,
+ .llseek = snd_disconnect_llseek,
+ .read = snd_disconnect_read,
+ .write = snd_disconnect_write,
+ .release = snd_disconnect_release,
+ .poll = snd_disconnect_poll,
+ .unlocked_ioctl = snd_disconnect_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = snd_disconnect_ioctl,
+#endif
+ .mmap = snd_disconnect_mmap,
+ .fasync = snd_disconnect_fasync
+};
+
+/**
+ * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
+ * @card: soundcard structure
+ *
+ * Disconnects all APIs from the file-operations (user space).
+ *
+ * Return: Zero, otherwise a negative error code.
+ *
+ * Note: The current implementation replaces all active file->f_op with special
+ * dummy file operations (they do nothing except release).
+ */
+int snd_card_disconnect(struct snd_card *card)
+{
+ struct snd_monitor_file *mfile;
+
+ if (!card)
+ return -EINVAL;
+
+ spin_lock(&card->files_lock);
+ if (card->shutdown) {
+ spin_unlock(&card->files_lock);
+ return 0;
+ }
+ card->shutdown = 1;
+ spin_unlock(&card->files_lock);
+
+ /* phase 1: disable fops (user space) operations for ALSA API */
+ mutex_lock(&snd_card_mutex);
+ snd_cards[card->number] = NULL;
+ clear_bit(card->number, snd_cards_lock);
+ mutex_unlock(&snd_card_mutex);
+
+ /* phase 2: replace file->f_op with special dummy operations */
+
+ spin_lock(&card->files_lock);
+ list_for_each_entry(mfile, &card->files_list, list) {
+ /* it's critical part, use endless loop */
+ /* we have no room to fail */
+ mfile->disconnected_f_op = mfile->file->f_op;
+
+ spin_lock(&shutdown_lock);
+ list_add(&mfile->shutdown_list, &shutdown_files);
+ spin_unlock(&shutdown_lock);
+
+ mfile->file->f_op = &snd_shutdown_f_ops;
+ fops_get(mfile->file->f_op);
+ }
+ spin_unlock(&card->files_lock);
+
+ /* phase 3: notify all connected devices about disconnection */
+ /* at this point, they cannot respond to any calls except release() */
+
+#if IS_ENABLED(CONFIG_SND_MIXER_OSS)
+ if (snd_mixer_oss_notify_callback)
+ snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
+#endif
+
+ /* notify all devices that we are disconnected */
+ snd_device_disconnect_all(card);
+
+ snd_info_card_disconnect(card);
+ if (card->registered) {
+ device_del(&card->card_dev);
+ card->registered = false;
+ }
+#ifdef CONFIG_PM
+ wake_up(&card->power_sleep);
+#endif
+ return 0;
+}
+
+EXPORT_SYMBOL(snd_card_disconnect);
+
+static int snd_card_do_free(struct snd_card *card)
+{
+#if IS_ENABLED(CONFIG_SND_MIXER_OSS)
+ if (snd_mixer_oss_notify_callback)
+ snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
+#endif
+ snd_device_free_all(card);
+ if (card->private_free)
+ card->private_free(card);
+ snd_info_free_entry(card->proc_id);
+ if (snd_info_card_free(card) < 0) {
+ dev_warn(card->dev, "unable to free card info\n");
+ /* Not fatal error */
+ }
+ if (card->release_completion)
+ complete(card->release_completion);
+ kfree(card);
+ return 0;
+}
+
+/**
+ * snd_card_free_when_closed - Disconnect the card, free it later eventually
+ * @card: soundcard structure
+ *
+ * Unlike snd_card_free(), this function doesn't try to release the card
+ * resource immediately, but tries to disconnect at first. When the card
+ * is still in use, the function returns before freeing the resources.
+ * The card resources will be freed when the refcount gets to zero.
+ */
+int snd_card_free_when_closed(struct snd_card *card)
+{
+ int ret = snd_card_disconnect(card);
+ if (ret)
+ return ret;
+ put_device(&card->card_dev);
+ return 0;
+}
+EXPORT_SYMBOL(snd_card_free_when_closed);
+
+/**
+ * snd_card_free - frees given soundcard structure
+ * @card: soundcard structure
+ *
+ * This function releases the soundcard structure and the all assigned
+ * devices automatically. That is, you don't have to release the devices
+ * by yourself.
+ *
+ * This function waits until the all resources are properly released.
+ *
+ * Return: Zero. Frees all associated devices and frees the control
+ * interface associated to given soundcard.
+ */
+int snd_card_free(struct snd_card *card)
+{
+ struct completion released;
+ int ret;
+
+ init_completion(&released);
+ card->release_completion = &released;
+ ret = snd_card_free_when_closed(card);
+ if (ret)
+ return ret;
+ /* wait, until all devices are ready for the free operation */
+ wait_for_completion(&released);
+ return 0;
+}
+EXPORT_SYMBOL(snd_card_free);
+
+/* retrieve the last word of shortname or longname */
+static const char *retrieve_id_from_card_name(const char *name)
+{
+ const char *spos = name;
+
+ while (*name) {
+ if (isspace(*name) && isalnum(name[1]))
+ spos = name + 1;
+ name++;
+ }
+ return spos;
+}
+
+/* return true if the given id string doesn't conflict any other card ids */
+static bool card_id_ok(struct snd_card *card, const char *id)
+{
+ int i;
+ if (!snd_info_check_reserved_words(id))
+ return false;
+ for (i = 0; i < snd_ecards_limit; i++) {
+ if (snd_cards[i] && snd_cards[i] != card &&
+ !strcmp(snd_cards[i]->id, id))
+ return false;
+ }
+ return true;
+}
+
+/* copy to card->id only with valid letters from nid */
+static void copy_valid_id_string(struct snd_card *card, const char *src,
+ const char *nid)
+{
+ char *id = card->id;
+
+ while (*nid && !isalnum(*nid))
+ nid++;
+ if (isdigit(*nid))
+ *id++ = isalpha(*src) ? *src : 'D';
+ while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
+ if (isalnum(*nid))
+ *id++ = *nid;
+ nid++;
+ }
+ *id = 0;
+}
+
+/* Set card->id from the given string
+ * If the string conflicts with other ids, add a suffix to make it unique.
+ */
+static void snd_card_set_id_no_lock(struct snd_card *card, const char *src,
+ const char *nid)
+{
+ int len, loops;
+ bool is_default = false;
+ char *id;
+
+ copy_valid_id_string(card, src, nid);
+ id = card->id;
+
+ again:
+ /* use "Default" for obviously invalid strings
+ * ("card" conflicts with proc directories)
+ */
+ if (!*id || !strncmp(id, "card", 4)) {
+ strcpy(id, "Default");
+ is_default = true;
+ }
+
+ len = strlen(id);
+ for (loops = 0; loops < SNDRV_CARDS; loops++) {
+ char *spos;
+ char sfxstr[5]; /* "_012" */
+ int sfxlen;
+
+ if (card_id_ok(card, id))
+ return; /* OK */
+
+ /* Add _XYZ suffix */
+ sprintf(sfxstr, "_%X", loops + 1);
+ sfxlen = strlen(sfxstr);
+ if (len + sfxlen >= sizeof(card->id))
+ spos = id + sizeof(card->id) - sfxlen - 1;
+ else
+ spos = id + len;
+ strcpy(spos, sfxstr);
+ }
+ /* fallback to the default id */
+ if (!is_default) {
+ *id = 0;
+ goto again;
+ }
+ /* last resort... */
+ dev_err(card->dev, "unable to set card id (%s)\n", id);
+ if (card->proc_root->name)
+ strlcpy(card->id, card->proc_root->name, sizeof(card->id));
+}
+
+/**
+ * snd_card_set_id - set card identification name
+ * @card: soundcard structure
+ * @nid: new identification string
+ *
+ * This function sets the card identification and checks for name
+ * collisions.
+ */
+void snd_card_set_id(struct snd_card *card, const char *nid)
+{
+ /* check if user specified own card->id */
+ if (card->id[0] != '\0')
+ return;
+ mutex_lock(&snd_card_mutex);
+ snd_card_set_id_no_lock(card, nid, nid);
+ mutex_unlock(&snd_card_mutex);
+}
+EXPORT_SYMBOL(snd_card_set_id);
+
+static ssize_t
+card_id_show_attr(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct snd_card *card = container_of(dev, struct snd_card, card_dev);
+ return snprintf(buf, PAGE_SIZE, "%s\n", card->id);
+}
+
+static ssize_t
+card_id_store_attr(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct snd_card *card = container_of(dev, struct snd_card, card_dev);
+ char buf1[sizeof(card->id)];
+ size_t copy = count > sizeof(card->id) - 1 ?
+ sizeof(card->id) - 1 : count;
+ size_t idx;
+ int c;
+
+ for (idx = 0; idx < copy; idx++) {
+ c = buf[idx];
+ if (!isalnum(c) && c != '_' && c != '-')
+ return -EINVAL;
+ }
+ memcpy(buf1, buf, copy);
+ buf1[copy] = '\0';
+ mutex_lock(&snd_card_mutex);
+ if (!card_id_ok(NULL, buf1)) {
+ mutex_unlock(&snd_card_mutex);
+ return -EEXIST;
+ }
+ strcpy(card->id, buf1);
+ snd_info_card_id_change(card);
+ mutex_unlock(&snd_card_mutex);
+
+ return count;
+}
+
+static DEVICE_ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr);
+
+static ssize_t
+card_number_show_attr(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct snd_card *card = container_of(dev, struct snd_card, card_dev);
+ return snprintf(buf, PAGE_SIZE, "%i\n", card->number);
+}
+
+static DEVICE_ATTR(number, S_IRUGO, card_number_show_attr, NULL);
+
+static struct attribute *card_dev_attrs[] = {
+ &dev_attr_id.attr,
+ &dev_attr_number.attr,
+ NULL
+};
+
+static const struct attribute_group card_dev_attr_group = {
+ .attrs = card_dev_attrs,
+};
+
+/**
+ * snd_card_add_dev_attr - Append a new sysfs attribute group to card
+ * @card: card instance
+ * @group: attribute group to append
+ */
+int snd_card_add_dev_attr(struct snd_card *card,
+ const struct attribute_group *group)
+{
+ int i;
+
+ /* loop for (arraysize-1) here to keep NULL at the last entry */
+ for (i = 0; i < ARRAY_SIZE(card->dev_groups) - 1; i++) {
+ if (!card->dev_groups[i]) {
+ card->dev_groups[i] = group;
+ return 0;
+ }
+ }
+
+ dev_err(card->dev, "Too many groups assigned\n");
+ return -ENOSPC;
+};
+EXPORT_SYMBOL_GPL(snd_card_add_dev_attr);
+
+/**
+ * snd_card_register - register the soundcard
+ * @card: soundcard structure
+ *
+ * This function registers all the devices assigned to the soundcard.
+ * Until calling this, the ALSA control interface is blocked from the
+ * external accesses. Thus, you should call this function at the end
+ * of the initialization of the card.
+ *
+ * Return: Zero otherwise a negative error code if the registration failed.
+ */
+int snd_card_register(struct snd_card *card)
+{
+ int err;
+
+ if (snd_BUG_ON(!card))
+ return -EINVAL;
+
+ if (!card->registered) {
+ err = device_add(&card->card_dev);
+ if (err < 0)
+ return err;
+ card->registered = true;
+ }
+
+ if ((err = snd_device_register_all(card)) < 0)
+ return err;
+ mutex_lock(&snd_card_mutex);
+ if (snd_cards[card->number]) {
+ /* already registered */
+ mutex_unlock(&snd_card_mutex);
+ return 0;
+ }
+ if (*card->id) {
+ /* make a unique id name from the given string */
+ char tmpid[sizeof(card->id)];
+ memcpy(tmpid, card->id, sizeof(card->id));
+ snd_card_set_id_no_lock(card, tmpid, tmpid);
+ } else {
+ /* create an id from either shortname or longname */
+ const char *src;
+ src = *card->shortname ? card->shortname : card->longname;
+ snd_card_set_id_no_lock(card, src,
+ retrieve_id_from_card_name(src));
+ }
+ snd_cards[card->number] = card;
+ mutex_unlock(&snd_card_mutex);
+ init_info_for_card(card);
+#if IS_ENABLED(CONFIG_SND_MIXER_OSS)
+ if (snd_mixer_oss_notify_callback)
+ snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
+#endif
+ return 0;
+}
+
+EXPORT_SYMBOL(snd_card_register);
+
+#ifdef CONFIG_PROC_FS
+static struct snd_info_entry *snd_card_info_entry;
+
+static void snd_card_info_read(struct snd_info_entry *entry,
+ struct snd_info_buffer *buffer)
+{
+ int idx, count;
+ struct snd_card *card;
+
+ for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
+ mutex_lock(&snd_card_mutex);
+ if ((card = snd_cards[idx]) != NULL) {
+ count++;
+ snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
+ idx,
+ card->id,
+ card->driver,
+ card->shortname);
+ snd_iprintf(buffer, " %s\n",
+ card->longname);
+ }
+ mutex_unlock(&snd_card_mutex);
+ }
+ if (!count)
+ snd_iprintf(buffer, "--- no soundcards ---\n");
+}
+
+#ifdef CONFIG_SND_OSSEMUL
+
+void snd_card_info_read_oss(struct snd_info_buffer *buffer)
+{
+ int idx, count;
+ struct snd_card *card;
+
+ for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
+ mutex_lock(&snd_card_mutex);
+ if ((card = snd_cards[idx]) != NULL) {
+ count++;
+ snd_iprintf(buffer, "%s\n", card->longname);
+ }
+ mutex_unlock(&snd_card_mutex);
+ }
+ if (!count) {
+ snd_iprintf(buffer, "--- no soundcards ---\n");
+ }
+}
+
+#endif
+
+#ifdef MODULE
+static struct snd_info_entry *snd_card_module_info_entry;
+static void snd_card_module_info_read(struct snd_info_entry *entry,
+ struct snd_info_buffer *buffer)
+{
+ int idx;
+ struct snd_card *card;
+
+ for (idx = 0; idx < SNDRV_CARDS; idx++) {
+ mutex_lock(&snd_card_mutex);
+ if ((card = snd_cards[idx]) != NULL)
+ snd_iprintf(buffer, "%2i %s\n",
+ idx, card->module->name);
+ mutex_unlock(&snd_card_mutex);
+ }
+}
+#endif
+
+int __init snd_card_info_init(void)
+{
+ struct snd_info_entry *entry;
+
+ entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
+ if (! entry)
+ return -ENOMEM;
+ entry->c.text.read = snd_card_info_read;
+ if (snd_info_register(entry) < 0) {
+ snd_info_free_entry(entry);
+ return -ENOMEM;
+ }
+ snd_card_info_entry = entry;
+
+#ifdef MODULE
+ entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
+ if (entry) {
+ entry->c.text.read = snd_card_module_info_read;
+ if (snd_info_register(entry) < 0)
+ snd_info_free_entry(entry);
+ else
+ snd_card_module_info_entry = entry;
+ }
+#endif
+
+ return 0;
+}
+
+int __exit snd_card_info_done(void)
+{
+ snd_info_free_entry(snd_card_info_entry);
+#ifdef MODULE
+ snd_info_free_entry(snd_card_module_info_entry);
+#endif
+ return 0;
+}
+
+#endif /* CONFIG_PROC_FS */
+
+/**
+ * snd_component_add - add a component string
+ * @card: soundcard structure
+ * @component: the component id string
+ *
+ * This function adds the component id string to the supported list.
+ * The component can be referred from the alsa-lib.
+ *
+ * Return: Zero otherwise a negative error code.
+ */
+
+int snd_component_add(struct snd_card *card, const char *component)
+{
+ char *ptr;
+ int len = strlen(component);
+
+ ptr = strstr(card->components, component);
+ if (ptr != NULL) {
+ if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */
+ return 1;
+ }
+ if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
+ snd_BUG();
+ return -ENOMEM;
+ }
+ if (card->components[0] != '\0')
+ strcat(card->components, " ");
+ strcat(card->components, component);
+ return 0;
+}
+
+EXPORT_SYMBOL(snd_component_add);
+
+/**
+ * snd_card_file_add - add the file to the file list of the card
+ * @card: soundcard structure
+ * @file: file pointer
+ *
+ * This function adds the file to the file linked-list of the card.
+ * This linked-list is used to keep tracking the connection state,
+ * and to avoid the release of busy resources by hotplug.
+ *
+ * Return: zero or a negative error code.
+ */
+int snd_card_file_add(struct snd_card *card, struct file *file)
+{
+ struct snd_monitor_file *mfile;
+
+ mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
+ if (mfile == NULL)
+ return -ENOMEM;
+ mfile->file = file;
+ mfile->disconnected_f_op = NULL;
+ INIT_LIST_HEAD(&mfile->shutdown_list);
+ spin_lock(&card->files_lock);
+ if (card->shutdown) {
+ spin_unlock(&card->files_lock);
+ kfree(mfile);
+ return -ENODEV;
+ }
+ list_add(&mfile->list, &card->files_list);
+ get_device(&card->card_dev);
+ spin_unlock(&card->files_lock);
+ return 0;
+}
+
+EXPORT_SYMBOL(snd_card_file_add);
+
+/**
+ * snd_card_file_remove - remove the file from the file list
+ * @card: soundcard structure
+ * @file: file pointer
+ *
+ * This function removes the file formerly added to the card via
+ * snd_card_file_add() function.
+ * If all files are removed and snd_card_free_when_closed() was
+ * called beforehand, it processes the pending release of
+ * resources.
+ *
+ * Return: Zero or a negative error code.
+ */
+int snd_card_file_remove(struct snd_card *card, struct file *file)
+{
+ struct snd_monitor_file *mfile, *found = NULL;
+
+ spin_lock(&card->files_lock);
+ list_for_each_entry(mfile, &card->files_list, list) {
+ if (mfile->file == file) {
+ list_del(&mfile->list);
+ spin_lock(&shutdown_lock);
+ list_del(&mfile->shutdown_list);
+ spin_unlock(&shutdown_lock);
+ if (mfile->disconnected_f_op)
+ fops_put(mfile->disconnected_f_op);
+ found = mfile;
+ break;
+ }
+ }
+ spin_unlock(&card->files_lock);
+ if (!found) {
+ dev_err(card->dev, "card file remove problem (%p)\n", file);
+ return -ENOENT;
+ }
+ kfree(found);
+ put_device(&card->card_dev);
+ return 0;
+}
+
+EXPORT_SYMBOL(snd_card_file_remove);
+
+#ifdef CONFIG_PM
+/**
+ * snd_power_wait - wait until the power-state is changed.
+ * @card: soundcard structure
+ * @power_state: expected power state
+ *
+ * Waits until the power-state is changed.
+ *
+ * Return: Zero if successful, or a negative error code.
+ *
+ * Note: the power lock must be active before call.
+ */
+int snd_power_wait(struct snd_card *card, unsigned int power_state)
+{
+ wait_queue_t wait;
+ int result = 0;
+
+ /* fastpath */
+ if (snd_power_get_state(card) == power_state)
+ return 0;
+ init_waitqueue_entry(&wait, current);
+ add_wait_queue(&card->power_sleep, &wait);
+ while (1) {
+ if (card->shutdown) {
+ result = -ENODEV;
+ break;
+ }
+ if (snd_power_get_state(card) == power_state)
+ break;
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ snd_power_unlock(card);
+ schedule_timeout(30 * HZ);
+ snd_power_lock(card);
+ }
+ remove_wait_queue(&card->power_sleep, &wait);
+ return result;
+}
+
+EXPORT_SYMBOL(snd_power_wait);
+#endif /* CONFIG_PM */
Code Review / kvmfornfv.git / blobdiff