/**
   * struct bus_type_private - structure to hold the private to the driver core portions of the bus_type structure.
   *
   * @subsys - the struct kset that defines this bus.  This is the main kobject
   * @drivers_kset - the list of drivers associated with this bus
   * @devices_kset - the list of devices associated with this bus
   * @klist_devices - the klist to iterate over the @devices_kset
   * @klist_drivers - the klist to iterate over the @drivers_kset
   * @bus_notifier - the bus notifier list for anything that cares about things
   * on this bus.
   * @bus - pointer back to the struct bus_type that this structure is associated
   * with.
   *
   * This structure is the one that is the actual kobject allowing struct
   * bus_type to be statically allocated safely.  Nothing outside of the driver
   * core should ever touch these fields.
   */
  struct bus_type_private {
  	struct kset subsys;
  	struct kset *drivers_kset;
  	struct kset *devices_kset;
  	struct klist klist_devices;
  	struct klist klist_drivers;
  	struct blocking_notifier_head bus_notifier;
  	unsigned int drivers_autoprobe:1;
  	struct bus_type *bus;
  };

  struct driver_private {
  	struct kobject kobj;
  	struct klist klist_devices;
  	struct klist_node knode_bus;
  	struct module_kobject *mkobj;
  	struct device_driver *driver;
  };
  #define to_driver(obj) container_of(obj, struct driver_private, kobj)

  
  /**
   * struct class_private - structure to hold the private to the driver core portions of the class structure.
   *

   * @class_subsys - the struct kset that defines this class.  This is the main kobject

   * @class_devices - list of devices associated with this class

   * @class_interfaces - list of class_interfaces associated with this class

   * @class_dirs - "glue" directory for virtual devices associated with this class

   * @class_mutex - mutex to protect the children, devices, and interfaces lists.

   * @class - pointer back to the struct class that this structure is associated
   * with.
   *
   * This structure is the one that is the actual kobject allowing struct
   * class to be statically allocated safely.  Nothing outside of the driver
   * core should ever touch these fields.
   */
  struct class_private {

  	struct kset class_subsys;

  	struct klist class_devices;

  	struct list_head class_interfaces;

  	struct kset class_dirs;

  	struct mutex class_mutex;

  	struct class *class;
  };

  #define to_class(obj)	\
  	container_of(obj, struct class_private, class_subsys.kobj)

  /**
   * struct device_private - structure to hold the private to the driver core portions of the device structure.
   *

   * @klist_children - klist containing all children of this device
   * @knode_parent - node in sibling list

   * @knode_driver - node in driver list

   * @knode_bus - node in bus list

   * @driver_data - private pointer for driver specific info.  Will turn into a
   * list soon.

   * @device - pointer back to the struct class that this structure is
   * associated with.
   *
   * Nothing outside of the driver core should ever touch these fields.
   */
  struct device_private {

  	struct klist klist_children;
  	struct klist_node knode_parent;

  	struct klist_node knode_driver;

  	struct klist_node knode_bus;

  	void *driver_data;

  	struct device *device;
  };

  #define to_device_private_parent(obj)	\
  	container_of(obj, struct device_private, knode_parent)

  #define to_device_private_driver(obj)	\
  	container_of(obj, struct device_private, knode_driver)

  #define to_device_private_bus(obj)	\
  	container_of(obj, struct device_private, knode_bus)

  extern int device_private_init(struct device *dev);

  /* initialisation functions */

  extern int devices_init(void);
  extern int buses_init(void);
  extern int classes_init(void);
  extern int firmware_init(void);

  #ifdef CONFIG_SYS_HYPERVISOR
  extern int hypervisor_init(void);
  #else
  static inline int hypervisor_init(void) { return 0; }
  #endif

  extern int platform_bus_init(void);
  extern int system_bus_init(void);
  extern int cpu_dev_init(void);

  extern int bus_add_device(struct device *dev);

  extern void bus_probe_device(struct device *dev);

  extern void bus_remove_device(struct device *dev);

  extern int bus_add_driver(struct device_driver *drv);
  extern void bus_remove_driver(struct device_driver *drv);

  extern void driver_detach(struct device_driver *drv);
  extern int driver_probe_device(struct device_driver *drv, struct device *dev);

  static inline int driver_match_device(struct device_driver *drv,
  				      struct device *dev)
  {

  	return drv->bus->match ? drv->bus->match(dev, drv) : 1;

  }

  extern void sysdev_shutdown(void);

  extern char *make_class_name(const char *name, struct kobject *kobj);

  extern int devres_release_all(struct device *dev);

  extern struct kset *devices_kset;

  #if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS)

  extern void module_add_driver(struct module *mod, struct device_driver *drv);
  extern void module_remove_driver(struct device_driver *drv);
  #else
  static inline void module_add_driver(struct module *mod,
  				     struct device_driver *drv) { }
  static inline void module_remove_driver(struct device_driver *drv) { }
  #endif

  
  #ifdef CONFIG_DEVTMPFS
  extern int devtmpfs_init(void);
  #else
  static inline int devtmpfs_init(void) { return 0; }
  #endif