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info.inc

#define __NO_VERSION__
#include "adriver.h"
#ifdef CONFIG_HAVE_DEPRECATED_CONFIG_H
#include <linux/autoconf.h>
#else
#include <linux/config.h>
#endif
#include <linux/version.h>
#include <linux/utsrelease.h>
#include <linux/proc_fs.h>

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 4, 0)
#include <sound/core.h>
#include <sound/info.h>
#include <sound/version.h>

static int snd_info_card_readlink(struct dentry *dentry,
                          char *buffer, int buflen)
{
        char *s = PDE(dentry->d_inode)->data;
      int len;
      
      if (s == NULL)
            return -EIO;
      len = strlen(s);
      if (len > buflen)
            len = buflen;
      if (copy_to_user(buffer, s, len))
            return -EFAULT;
      return len;
}

static struct dentry *snd_info_card_followlink(struct dentry *dentry,
                                     struct dentry *base,
                                     unsigned int follow)
{
      char *s = PDE(dentry->d_inode)->data;
      return lookup_dentry(s, base, follow);
}

static struct file_operations snd_info_card_link_operations =
{
      NULL
};

struct inode_operations snd_info_card_link_inode_operations =
{
      .default_file_ops =     &snd_info_card_link_operations,
      .readlink =       snd_info_card_readlink,
      .follow_link =          snd_info_card_followlink,
};

static struct proc_dir_entry *proc_symlink(const char *name,
                                 struct proc_dir_entry *parent,
                                 const char *dest)
{
      char *s = kstrdup(dest, GFP_KERNEL);
      struct proc_dir_entry *p;

      if (s == NULL)
            return NULL;
      p = create_proc_entry(name, S_IFLNK | S_IRUGO | S_IWUGO | S_IXUGO, parent);
      if (p == NULL) {
            kfree(s);
            return NULL;
      }
      p->data = s;
      p->ops = &snd_info_card_link_inode_operations;
      return p;
}

static void snd_info_fill_inode(struct inode *inode, int fill)
{
      if (fill)
            MOD_INC_USE_COUNT;
      else
            MOD_DEC_USE_COUNT;
}

static inline void snd_info_entry_prepare(struct proc_dir_entry *de)
{
      de->fill_inode = snd_info_fill_inode;
}

void snd_remove_proc_entry(struct proc_dir_entry *parent,
                     struct proc_dir_entry *de)
{
      if (parent && de) {
            if (S_ISLNK(de->mode) && de->data) {
                  kfree(de->data);
                  de->data = 0;
            }
            proc_unregister(parent, de->low_ino);
      }
}

#else /* LINUX_VERSION_CODE < 2.4.0 */

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

#endif

#ifdef HAVE_PROCFS_OWNER
static inline void snd_info_entry_prepare(struct proc_dir_entry *de)
{
      de->owner = THIS_MODULE;
}

/**
 * snd_create_proc_entry - create a procfs entry
 * @name: the name of the proc file
 * @mode: the file permission bits, S_Ixxx
 * @parent: the parent proc-directory entry
 *
 * Creates a new proc file entry with the given name and permission
 * on the given directory.
 *
 * Returns the pointer of new instance or NULL on failure.
 */
static struct proc_dir_entry *
      snd_create_proc_entry(const char *name, mode_t mode,
                        struct proc_dir_entry *parent)
{
      struct proc_dir_entry *p;
      p = create_proc_entry(name, mode, parent);
      if (p)
            snd_info_entry_prepare(p);
      return p;
}
static void snd_remove_proc_entry(struct proc_dir_entry *parent,
                                  struct proc_dir_entry *de)
{
        if (de)
                remove_proc_entry(de->name, parent);
}
#else
static inline struct proc_dir_entry *
      snd_create_proc_entry(const char *name, mode_t mode,
                        struct proc_dir_entry *parent)
{
      return create_proc_entry(name, mode, parent);
}
#endif /* HAVE_PROCFS_OWNER */

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