-extern int sysfs_write_classdev_attr(unsigned char *dev, unsigned char *attrib,
- unsigned char *value, size_t len);
-extern int sysfs_read_classdev_attr(unsigned char *dev, unsigned char *attrib,
- unsigned char *value, size_t len);
+extern struct sysfs_attribute *sysfs_open_classdev_attr
+ (const unsigned char *classname, const unsigned char *dev,
+ const unsigned char *attrib);