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Sourcecode: alsa-driver version File versions

info.c

/*
 *  Information interface for ALSA driver
 *  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/time.h>
#include <linux/mm.h>
#include <linux/smp_lock.h>
#include <linux/string.h>
#include <sound/core.h>
#include <sound/minors.h>
#include <sound/info.h>
#include <sound/version.h>
#include <linux/proc_fs.h>
#include <linux/mutex.h>
#include <stdarg.h>

/*
 *
 */

#ifdef CONFIG_PROC_FS

int snd_info_check_reserved_words(const char *str)
{
      static char *reserved[] =
      {
            "version",
            "meminfo",
            "memdebug",
            "detect",
            "devices",
            "oss",
            "cards",
            "timers",
            "synth",
            "pcm",
            "seq",
            NULL
      };
      char **xstr = reserved;

      while (*xstr) {
            if (!strcmp(*xstr, str))
                  return 0;
            xstr++;
      }
      if (!strncmp(str, "card", 4))
            return 0;
      return 1;
}

static DEFINE_MUTEX(info_mutex);

struct snd_info_private_data {
      struct snd_info_buffer *rbuffer;
      struct snd_info_buffer *wbuffer;
      struct snd_info_entry *entry;
      void *file_private_data;
};

static int snd_info_version_init(void);
static int snd_info_version_done(void);
static void snd_info_disconnect(struct snd_info_entry *entry);


/* resize the proc r/w buffer */
static int resize_info_buffer(struct snd_info_buffer *buffer,
                        unsigned int nsize)
{
      char *nbuf;

      nsize = PAGE_ALIGN(nsize);
      nbuf = kmalloc(nsize, GFP_KERNEL);
      if (! nbuf)
            return -ENOMEM;

      memcpy(nbuf, buffer->buffer, buffer->len);
      kfree(buffer->buffer);
      buffer->buffer = nbuf;
      buffer->len = nsize;
      return 0;
}

/**
 * snd_iprintf - printf on the procfs buffer
 * @buffer: the procfs buffer
 * @fmt: the printf format
 *
 * Outputs the string on the procfs buffer just like printf().
 *
 * Returns the size of output string.
 */
int snd_iprintf(struct snd_info_buffer *buffer, char *fmt,...)
{
      va_list args;
      int len, res;
      int err = 0;

      might_sleep();
      if (buffer->stop || buffer->error)
            return 0;
      len = buffer->len - buffer->size;
      va_start(args, fmt);
      for (;;) {
            va_list ap;
            va_copy(ap, args);
            res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, ap);
            va_end(ap);
            if (res < len)
                  break;
            err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE);
            if (err < 0)
                  break;
            len = buffer->len - buffer->size;
      }
      va_end(args);

      if (err < 0)
            return err;
      buffer->curr += res;
      buffer->size += res;
      return res;
}

EXPORT_SYMBOL(snd_iprintf);

/*

 */

static struct proc_dir_entry *snd_proc_root;
struct snd_info_entry *snd_seq_root;
EXPORT_SYMBOL(snd_seq_root);

#ifdef CONFIG_SND_OSSEMUL
struct snd_info_entry *snd_oss_root;
#endif

static void snd_remove_proc_entry(struct proc_dir_entry *parent,
                          struct proc_dir_entry *de)
{
      if (de)
            remove_proc_entry(de->name, parent);
}

static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
{
      struct snd_info_private_data *data;
      struct snd_info_entry *entry;
      loff_t ret;

      data = file->private_data;
      entry = data->entry;
      lock_kernel();
      switch (entry->content) {
      case SNDRV_INFO_CONTENT_TEXT:
            switch (orig) {
            case SEEK_SET:
                  file->f_pos = offset;
                  ret = file->f_pos;
                  goto out;
            case SEEK_CUR:
                  file->f_pos += offset;
                  ret = file->f_pos;
                  goto out;
            case SEEK_END:
            default:
                  ret = -EINVAL;
                  goto out;
            }
            break;
      case SNDRV_INFO_CONTENT_DATA:
            if (entry->c.ops->llseek) {
                  ret = entry->c.ops->llseek(entry,
                                        data->file_private_data,
                                        file, offset, orig);
                  goto out;
            }
            break;
      }
      ret = -ENXIO;
out:
      unlock_kernel();
      return ret;
}

static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
                           size_t count, loff_t * offset)
{
      struct snd_info_private_data *data;
      struct snd_info_entry *entry;
      struct snd_info_buffer *buf;
      size_t size = 0;
      loff_t pos;

      data = file->private_data;
      if (snd_BUG_ON(!data))
            return -ENXIO;
      pos = *offset;
      if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
            return -EIO;
      if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
            return -EIO;
      entry = data->entry;
      switch (entry->content) {
      case SNDRV_INFO_CONTENT_TEXT:
            buf = data->rbuffer;
            if (buf == NULL)
                  return -EIO;
            if (pos >= buf->size)
                  return 0;
            size = buf->size - pos;
            size = min(count, size);
            if (copy_to_user(buffer, buf->buffer + pos, size))
                  return -EFAULT;
            break;
      case SNDRV_INFO_CONTENT_DATA:
            if (entry->c.ops->read)
                  size = entry->c.ops->read(entry,
                                      data->file_private_data,
                                      file, buffer, count, pos);
            break;
      }
      if ((ssize_t) size > 0)
            *offset = pos + size;
      return size;
}

static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer,
                            size_t count, loff_t * offset)
{
      struct snd_info_private_data *data;
      struct snd_info_entry *entry;
      struct snd_info_buffer *buf;
      ssize_t size = 0;
      loff_t pos;

      data = file->private_data;
      if (snd_BUG_ON(!data))
            return -ENXIO;
      entry = data->entry;
      pos = *offset;
      if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
            return -EIO;
      if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
            return -EIO;
      switch (entry->content) {
      case SNDRV_INFO_CONTENT_TEXT:
            buf = data->wbuffer;
            if (buf == NULL)
                  return -EIO;
            mutex_lock(&entry->access);
            if (pos + count >= buf->len) {
                  if (resize_info_buffer(buf, pos + count)) {
                        mutex_unlock(&entry->access);
                        return -ENOMEM;
                  }
            }
            if (copy_from_user(buf->buffer + pos, buffer, count)) {
                  mutex_unlock(&entry->access);
                  return -EFAULT;
            }
            buf->size = pos + count;
            mutex_unlock(&entry->access);
            size = count;
            break;
      case SNDRV_INFO_CONTENT_DATA:
            if (entry->c.ops->write)
                  size = entry->c.ops->write(entry,
                                       data->file_private_data,
                                       file, buffer, count, pos);
            break;
      }
      if ((ssize_t) size > 0)
            *offset = pos + size;
      return size;
}

static int snd_info_entry_open(struct inode *inode, struct file *file)
{
      struct snd_info_entry *entry;
      struct snd_info_private_data *data;
      struct snd_info_buffer *buffer;
      struct proc_dir_entry *p;
      int mode, err;

      mutex_lock(&info_mutex);
      p = PDE(inode);
      entry = p == NULL ? NULL : (struct snd_info_entry *)p->data;
      if (entry == NULL || ! entry->p) {
            mutex_unlock(&info_mutex);
            return -ENODEV;
      }
      if (!try_module_get(entry->module)) {
            err = -EFAULT;
            goto __error1;
      }
      mode = file->f_flags & O_ACCMODE;
      if (mode == O_RDONLY || mode == O_RDWR) {
            if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
                 entry->c.ops->read == NULL)) {
                  err = -ENODEV;
                  goto __error;
            }
      }
      if (mode == O_WRONLY || mode == O_RDWR) {
            if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
                 entry->c.ops->write == NULL)) {
                  err = -ENODEV;
                  goto __error;
            }
      }
      data = kzalloc(sizeof(*data), GFP_KERNEL);
      if (data == NULL) {
            err = -ENOMEM;
            goto __error;
      }
      data->entry = entry;
      switch (entry->content) {
      case SNDRV_INFO_CONTENT_TEXT:
            if (mode == O_RDONLY || mode == O_RDWR) {
                  buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
                  if (buffer == NULL)
                        goto __nomem;
                  data->rbuffer = buffer;
                  buffer->len = PAGE_SIZE;
                  buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
                  if (buffer->buffer == NULL)
                        goto __nomem;
            }
            if (mode == O_WRONLY || mode == O_RDWR) {
                  buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
                  if (buffer == NULL)
                        goto __nomem;
                  data->wbuffer = buffer;
                  buffer->len = PAGE_SIZE;
                  buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
                  if (buffer->buffer == NULL)
                        goto __nomem;
            }
            break;
      case SNDRV_INFO_CONTENT_DATA: /* data */
            if (entry->c.ops->open) {
                  if ((err = entry->c.ops->open(entry, mode,
                                          &data->file_private_data)) < 0) {
                        kfree(data);
                        goto __error;
                  }
            }
            break;
      }
      file->private_data = data;
      mutex_unlock(&info_mutex);
      if (entry->content == SNDRV_INFO_CONTENT_TEXT &&
          (mode == O_RDONLY || mode == O_RDWR)) {
            if (entry->c.text.read) {
                  mutex_lock(&entry->access);
                  entry->c.text.read(entry, data->rbuffer);
                  mutex_unlock(&entry->access);
            }
      }
      return 0;

 __nomem:
      if (data->rbuffer) {
            kfree(data->rbuffer->buffer);
            kfree(data->rbuffer);
      }
      if (data->wbuffer) {
            kfree(data->wbuffer->buffer);
            kfree(data->wbuffer);
      }
      kfree(data);
      err = -ENOMEM;
      __error:
      module_put(entry->module);
      __error1:
      mutex_unlock(&info_mutex);
      return err;
}

static int snd_info_entry_release(struct inode *inode, struct file *file)
{
      struct snd_info_entry *entry;
      struct snd_info_private_data *data;
      int mode;

      mode = file->f_flags & O_ACCMODE;
      data = file->private_data;
      entry = data->entry;
      switch (entry->content) {
      case SNDRV_INFO_CONTENT_TEXT:
            if (data->rbuffer) {
                  kfree(data->rbuffer->buffer);
                  kfree(data->rbuffer);
            }
            if (data->wbuffer) {
                  if (entry->c.text.write) {
                        entry->c.text.write(entry, data->wbuffer);
                        if (data->wbuffer->error) {
                              snd_printk(KERN_WARNING "data write error to %s (%i)\n",
                                    entry->name,
                                    data->wbuffer->error);
                        }
                  }
                  kfree(data->wbuffer->buffer);
                  kfree(data->wbuffer);
            }
            break;
      case SNDRV_INFO_CONTENT_DATA:
            if (entry->c.ops->release)
                  entry->c.ops->release(entry, mode,
                                    data->file_private_data);
            break;
      }
      module_put(entry->module);
      kfree(data);
      return 0;
}

static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait)
{
      struct snd_info_private_data *data;
      struct snd_info_entry *entry;
      unsigned int mask;

      data = file->private_data;
      if (data == NULL)
            return 0;
      entry = data->entry;
      mask = 0;
      switch (entry->content) {
      case SNDRV_INFO_CONTENT_DATA:
            if (entry->c.ops->poll)
                  return entry->c.ops->poll(entry,
                                      data->file_private_data,
                                      file, wait);
            if (entry->c.ops->read)
                  mask |= POLLIN | POLLRDNORM;
            if (entry->c.ops->write)
                  mask |= POLLOUT | POLLWRNORM;
            break;
      }
      return mask;
}

static long snd_info_entry_ioctl(struct file *file, unsigned int cmd,
                        unsigned long arg)
{
      struct snd_info_private_data *data;
      struct snd_info_entry *entry;

      data = file->private_data;
      if (data == NULL)
            return 0;
      entry = data->entry;
      switch (entry->content) {
      case SNDRV_INFO_CONTENT_DATA:
            if (entry->c.ops->ioctl)
                  return entry->c.ops->ioctl(entry,
                                       data->file_private_data,
                                       file, cmd, arg);
            break;
      }
      return -ENOTTY;
}

static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
{
      struct inode *inode = file->f_path.dentry->d_inode;
      struct snd_info_private_data *data;
      struct snd_info_entry *entry;

      data = file->private_data;
      if (data == NULL)
            return 0;
      entry = data->entry;
      switch (entry->content) {
      case SNDRV_INFO_CONTENT_DATA:
            if (entry->c.ops->mmap)
                  return entry->c.ops->mmap(entry,
                                      data->file_private_data,
                                      inode, file, vma);
            break;
      }
      return -ENXIO;
}

static const struct file_operations snd_info_entry_operations =
{
      .owner =          THIS_MODULE,
      .llseek =         snd_info_entry_llseek,
      .read =                 snd_info_entry_read,
      .write =          snd_info_entry_write,
      .poll =                 snd_info_entry_poll,
      .unlocked_ioctl = snd_info_entry_ioctl,
      .mmap =                 snd_info_entry_mmap,
      .open =                 snd_info_entry_open,
      .release =        snd_info_entry_release,
};

int __init snd_info_init(void)
{
      struct proc_dir_entry *p;

      p = create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, NULL);
      if (p == NULL)
            return -ENOMEM;
      snd_proc_root = p;
#ifdef CONFIG_SND_OSSEMUL
      {
            struct snd_info_entry *entry;
            if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL)
                  return -ENOMEM;
            entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
            if (snd_info_register(entry) < 0) {
                  snd_info_free_entry(entry);
                  return -ENOMEM;
            }
            snd_oss_root = entry;
      }
#endif
#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
      {
            struct snd_info_entry *entry;
            if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL)
                  return -ENOMEM;
            entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
            if (snd_info_register(entry) < 0) {
                  snd_info_free_entry(entry);
                  return -ENOMEM;
            }
            snd_seq_root = entry;
      }
#endif
      snd_info_version_init();
      snd_minor_info_init();
      snd_minor_info_oss_init();
      snd_card_info_init();
      return 0;
}

int __exit snd_info_done(void)
{
      snd_card_info_done();
      snd_minor_info_oss_done();
      snd_minor_info_done();
      snd_info_version_done();
      if (snd_proc_root) {
#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
            snd_info_free_entry(snd_seq_root);
#endif
#ifdef CONFIG_SND_OSSEMUL
            snd_info_free_entry(snd_oss_root);
#endif
            snd_remove_proc_entry(NULL, snd_proc_root);
      }
      return 0;
}

/*

 */


/*
 * create a card proc file
 * called from init.c
 */
int snd_info_card_create(struct snd_card *card)
{
      char str[8];
      struct snd_info_entry *entry;

      if (snd_BUG_ON(!card))
            return -ENXIO;

      sprintf(str, "card%i", card->number);
      if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL)
            return -ENOMEM;
      entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
      if (snd_info_register(entry) < 0) {
            snd_info_free_entry(entry);
            return -ENOMEM;
      }
      card->proc_root = entry;
      return 0;
}

/*
 * register the card proc file
 * called from init.c
 */
int snd_info_card_register(struct snd_card *card)
{
      struct proc_dir_entry *p;

      if (snd_BUG_ON(!card))
            return -ENXIO;

      if (!strcmp(card->id, card->proc_root->name))
            return 0;

      p = proc_symlink(card->id, snd_proc_root, card->proc_root->name);
      if (p == NULL)
            return -ENOMEM;
      card->proc_root_link = p;
      return 0;
}

/*
 * called on card->id change
 */
void snd_info_card_id_change(struct snd_card *card)
{
      mutex_lock(&info_mutex);
      if (card->proc_root_link) {
            snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
            card->proc_root_link = NULL;
      }
      if (strcmp(card->id, card->proc_root->name))
            card->proc_root_link = proc_symlink(card->id,
                                        snd_proc_root,
                                        card->proc_root->name);
      mutex_unlock(&info_mutex);
}

/*
 * de-register the card proc file
 * called from init.c
 */
void snd_info_card_disconnect(struct snd_card *card)
{
      if (!card)
            return;
      mutex_lock(&info_mutex);
      if (card->proc_root_link) {
            snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
            card->proc_root_link = NULL;
      }
      if (card->proc_root)
            snd_info_disconnect(card->proc_root);
      mutex_unlock(&info_mutex);
}

/*
 * release the card proc file resources
 * called from init.c
 */
int snd_info_card_free(struct snd_card *card)
{
      if (!card)
            return 0;
      snd_info_free_entry(card->proc_root);
      card->proc_root = NULL;
      return 0;
}


/**
 * snd_info_get_line - read one line from the procfs buffer
 * @buffer: the procfs buffer
 * @line: the buffer to store
 * @len: the max. buffer size - 1
 *
 * Reads one line from the buffer and stores the string.
 *
 * Returns zero if successful, or 1 if error or EOF.
 */
int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
{
      int c = -1;

      if (len <= 0 || buffer->stop || buffer->error)
            return 1;
      while (--len > 0) {
            c = buffer->buffer[buffer->curr++];
            if (c == '\n') {
                  if (buffer->curr >= buffer->size)
                        buffer->stop = 1;
                  break;
            }
            *line++ = c;
            if (buffer->curr >= buffer->size) {
                  buffer->stop = 1;
                  break;
            }
      }
      while (c != '\n' && !buffer->stop) {
            c = buffer->buffer[buffer->curr++];
            if (buffer->curr >= buffer->size)
                  buffer->stop = 1;
      }
      *line = '\0';
      return 0;
}

EXPORT_SYMBOL(snd_info_get_line);

/**
 * snd_info_get_str - parse a string token
 * @dest: the buffer to store the string token
 * @src: the original string
 * @len: the max. length of token - 1
 *
 * Parses the original string and copy a token to the given
 * string buffer.
 *
 * Returns the updated pointer of the original string so that
 * it can be used for the next call.
 */
char *snd_info_get_str(char *dest, char *src, int len)
{
      int c;

      while (*src == ' ' || *src == '\t')
            src++;
      if (*src == '"' || *src == '\'') {
            c = *src++;
            while (--len > 0 && *src && *src != c) {
                  *dest++ = *src++;
            }
            if (*src == c)
                  src++;
      } else {
            while (--len > 0 && *src && *src != ' ' && *src != '\t') {
                  *dest++ = *src++;
            }
      }
      *dest = 0;
      while (*src == ' ' || *src == '\t')
            src++;
      return src;
}

EXPORT_SYMBOL(snd_info_get_str);

/**
 * snd_info_create_entry - create an info entry
 * @name: the proc file name
 *
 * Creates an info entry with the given file name and initializes as
 * the default state.
 *
 * Usually called from other functions such as
 * snd_info_create_card_entry().
 *
 * Returns the pointer of the new instance, or NULL on failure.
 */
static struct snd_info_entry *snd_info_create_entry(const char *name)
{
      struct snd_info_entry *entry;
      entry = kzalloc(sizeof(*entry), GFP_KERNEL);
      if (entry == NULL)
            return NULL;
      entry->name = kstrdup(name, GFP_KERNEL);
      if (entry->name == NULL) {
            kfree(entry);
            return NULL;
      }
      entry->mode = S_IFREG | S_IRUGO;
      entry->content = SNDRV_INFO_CONTENT_TEXT;
      mutex_init(&entry->access);
      INIT_LIST_HEAD(&entry->children);
      INIT_LIST_HEAD(&entry->list);
      return entry;
}

/**
 * snd_info_create_module_entry - create an info entry for the given module
 * @module: the module pointer
 * @name: the file name
 * @parent: the parent directory
 *
 * Creates a new info entry and assigns it to the given module.
 *
 * Returns the pointer of the new instance, or NULL on failure.
 */
struct snd_info_entry *snd_info_create_module_entry(struct module * module,
                                     const char *name,
                                     struct snd_info_entry *parent)
{
      struct snd_info_entry *entry = snd_info_create_entry(name);
      if (entry) {
            entry->module = module;
            entry->parent = parent;
      }
      return entry;
}

EXPORT_SYMBOL(snd_info_create_module_entry);

/**
 * snd_info_create_card_entry - create an info entry for the given card
 * @card: the card instance
 * @name: the file name
 * @parent: the parent directory
 *
 * Creates a new info entry and assigns it to the given card.
 *
 * Returns the pointer of the new instance, or NULL on failure.
 */
struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
                                   const char *name,
                                   struct snd_info_entry * parent)
{
      struct snd_info_entry *entry = snd_info_create_entry(name);
      if (entry) {
            entry->module = card->module;
            entry->card = card;
            entry->parent = parent;
      }
      return entry;
}

EXPORT_SYMBOL(snd_info_create_card_entry);

static void snd_info_disconnect(struct snd_info_entry *entry)
{
      struct list_head *p, *n;
      struct proc_dir_entry *root;

      list_for_each_safe(p, n, &entry->children) {
            snd_info_disconnect(list_entry(p, struct snd_info_entry, list));
      }

      if (! entry->p)
            return;
      list_del_init(&entry->list);
      root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
      snd_BUG_ON(!root);
      snd_remove_proc_entry(root, entry->p);
      entry->p = NULL;
}

static int snd_info_dev_free_entry(struct snd_device *device)
{
      struct snd_info_entry *entry = device->device_data;
      snd_info_free_entry(entry);
      return 0;
}

static int snd_info_dev_register_entry(struct snd_device *device)
{
      struct snd_info_entry *entry = device->device_data;
      return snd_info_register(entry);
}

/**
 * snd_card_proc_new - create an info entry for the given card
 * @card: the card instance
 * @name: the file name
 * @entryp: the pointer to store the new info entry
 *
 * Creates a new info entry and assigns it to the given card.
 * Unlike snd_info_create_card_entry(), this function registers the
 * info entry as an ALSA device component, so that it can be
 * unregistered/released without explicit call.
 * Also, you don't have to register this entry via snd_info_register(),
 * since this will be registered by snd_card_register() automatically.
 *
 * The parent is assumed as card->proc_root.
 *
 * For releasing this entry, use snd_device_free() instead of
 * snd_info_free_entry(). 
 *
 * Returns zero if successful, or a negative error code on failure.
 */
int snd_card_proc_new(struct snd_card *card, const char *name,
                  struct snd_info_entry **entryp)
{
      static struct snd_device_ops ops = {
            .dev_free = snd_info_dev_free_entry,
            .dev_register =   snd_info_dev_register_entry,
            /* disconnect is done via snd_info_card_disconnect() */
      };
      struct snd_info_entry *entry;
      int err;

      entry = snd_info_create_card_entry(card, name, card->proc_root);
      if (! entry)
            return -ENOMEM;
      if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) {
            snd_info_free_entry(entry);
            return err;
      }
      if (entryp)
            *entryp = entry;
      return 0;
}

EXPORT_SYMBOL(snd_card_proc_new);

/**
 * snd_info_free_entry - release the info entry
 * @entry: the info entry
 *
 * Releases the info entry.  Don't call this after registered.
 */
void snd_info_free_entry(struct snd_info_entry * entry)
{
      if (entry == NULL)
            return;
      if (entry->p) {
            mutex_lock(&info_mutex);
            snd_info_disconnect(entry);
            mutex_unlock(&info_mutex);
      }
      kfree(entry->name);
      if (entry->private_free)
            entry->private_free(entry);
      kfree(entry);
}

EXPORT_SYMBOL(snd_info_free_entry);

/**
 * snd_info_register - register the info entry
 * @entry: the info entry
 *
 * Registers the proc info entry.
 *
 * Returns zero if successful, or a negative error code on failure.
 */
int snd_info_register(struct snd_info_entry * entry)
{
      struct proc_dir_entry *root, *p = NULL;

      if (snd_BUG_ON(!entry))
            return -ENXIO;
      root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
      mutex_lock(&info_mutex);
      p = create_proc_entry(entry->name, entry->mode, root);
      if (!p) {
            mutex_unlock(&info_mutex);
            return -ENOMEM;
      }
      if (!S_ISDIR(entry->mode))
            p->proc_fops = &snd_info_entry_operations;
      p->size = entry->size;
      p->data = entry;
      entry->p = p;
      if (entry->parent)
            list_add_tail(&entry->list, &entry->parent->children);
      mutex_unlock(&info_mutex);
      return 0;
}

EXPORT_SYMBOL(snd_info_register);

/*

 */

static struct snd_info_entry *snd_info_version_entry;

static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
{
      snd_iprintf(buffer,
                "Advanced Linux Sound Architecture Driver Version "
                CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"
               );
}

static int __init snd_info_version_init(void)
{
      struct snd_info_entry *entry;

      entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
      if (entry == NULL)
            return -ENOMEM;
      entry->c.text.read = snd_info_version_read;
      if (snd_info_register(entry) < 0) {
            snd_info_free_entry(entry);
            return -ENOMEM;
      }
      snd_info_version_entry = entry;
      return 0;
}

static int __exit snd_info_version_done(void)
{
      snd_info_free_entry(snd_info_version_entry);
      return 0;
}

#endif /* CONFIG_PROC_FS */

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