+extern struct sysfs_class *sysfs_open_class(const unsigned char *name);
+extern struct sysfs_class_device *sysfs_get_class_device
+ (struct sysfs_class *class, unsigned char *name);
+extern struct sysfs_class_device *sysfs_open_class_device_by_name
+ (const unsigned char *class, const unsigned char *name);
+extern struct dlist *sysfs_get_classdev_attributes
+ (struct sysfs_class_device *cdev);
+extern struct sysfs_attribute *sysfs_get_classdev_attr
+ (struct sysfs_class_device *clsdev, const unsigned char *name);
+extern struct sysfs_attribute *sysfs_open_classdev_attr
+ (const unsigned char *classname, const unsigned char *dev,
+ const unsigned char *attrib);