struct sysfs_device {
struct list_head node; /* for device cache */
+ struct sysfs_device *parent; /* already cached parent*/
char devpath[PATH_SIZE];
char subsystem[NAME_SIZE]; /* $class/$bus/"drivers" */
char kernel_name[NAME_SIZE]; /* device instance name */
extern void sysfs_device_set_values(struct sysfs_device *dev, const char *devpath, const char *subsystem);
extern struct sysfs_device *sysfs_device_get(const char *devpath);
extern struct sysfs_device *sysfs_device_get_parent(struct sysfs_device *dev);
+extern struct sysfs_device *sysfs_device_get_parent_with_subsystem(struct sysfs_device *dev, const char *subsystem);
extern char *sysfs_attr_get_value(const char *devpath, const char *attr_name);
/* udev_add.c */