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/* SPDX-License-Identifier: GPL-2.0 */
* Copyright (c) 2001-2003 Patrick Mochel <>
* Copyright (c) 2004-2009 Greg Kroah-Hartman <>
* Copyright (c) 2008-2012 Novell Inc.
* Copyright (c) 2012-2019 Greg Kroah-Hartman <>
* Copyright (c) 2012-2019 Linux Foundation
* Core driver model functions and structures that should not be
* shared outside of the drivers/base/ directory.
#include <linux/notifier.h>
* struct subsys_private - structure to hold the private to the driver core portions of the bus_type/class structure.
* @subsys - the struct kset that defines this subsystem
* @devices_kset - the subsystem's 'devices' directory
* @interfaces - list of subsystem interfaces associated
* @mutex - protect the devices, and interfaces lists.
* @drivers_kset - the list of drivers associated
* @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.
* @glue_dirs - "glue" directory to put in-between the parent device to
* avoid namespace conflicts
* @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
* bus_type/class to be statically allocated safely. Nothing outside of the
* driver core should ever touch these fields.
struct subsys_private {
struct kset subsys;
struct kset *devices_kset;
struct list_head interfaces;
struct mutex mutex;
struct kset *drivers_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 kset glue_dirs;
struct class *class;
#define to_subsys_private(obj) container_of(obj, struct subsys_private, subsys.kobj)
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 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
* @knode_class - node in class list
* @deferred_probe - entry in deferred_probe_list which is used to retry the
* binding of drivers which were unable to get all the resources needed by
* the device; typically because it depends on another driver getting
* probed first.
* @async_driver - pointer to device driver awaiting probe via async_probe
* @device - pointer back to the struct device that this structure is
* associated with.
* @dead - This device is currently either in the process of or has been
* removed from the system. Any asynchronous events scheduled for this
* device should exit without taking any action.
* 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;
struct klist_node knode_class;
struct list_head deferred_probe;
struct device_driver *async_driver;
struct device *device;
u8 dead:1;
#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)
#define to_device_private_class(obj) \
container_of(obj, struct device_private, knode_class)
/* initialisation functions */
extern int devices_init(void);
extern int buses_init(void);
extern int classes_init(void);
extern int firmware_init(void);
extern int hypervisor_init(void);
static inline int hypervisor_init(void) { return 0; }
extern int platform_bus_init(void);
extern void cpu_dev_init(void);
extern void container_dev_init(void);
struct kobject *virtual_device_parent(struct device *dev);
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 device_release_driver_internal(struct device *dev,
struct device_driver *drv,
struct device *parent);
extern void driver_detach(struct device_driver *drv);
extern int driver_probe_device(struct device_driver *drv, struct device *dev);
extern void driver_deferred_probe_del(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 bool driver_allows_async_probing(struct device_driver *drv);
extern int driver_add_groups(struct device_driver *drv,
const struct attribute_group **groups);
extern void driver_remove_groups(struct device_driver *drv,
const struct attribute_group **groups);
int device_driver_attach(struct device_driver *drv, struct device *dev);
void device_driver_detach(struct device *dev);
extern char *make_class_name(const char *name, struct kobject *kobj);
extern int devres_release_all(struct device *dev);
extern void device_block_probing(void);
extern void device_unblock_probing(void);
extern void driver_deferred_probe_force_trigger(void);
/* /sys/devices directory */
extern struct kset *devices_kset;
extern void devices_kset_move_last(struct device *dev);
#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);
static inline void module_add_driver(struct module *mod,
struct device_driver *drv) { }
static inline void module_remove_driver(struct device_driver *drv) { }
extern int devtmpfs_init(void);
static inline int devtmpfs_init(void) { return 0; }
/* Device links support */
extern int device_links_read_lock(void);
extern void device_links_read_unlock(int idx);
extern int device_links_read_lock_held(void);
extern int device_links_check_suppliers(struct device *dev);
extern void device_links_driver_bound(struct device *dev);
extern void device_links_driver_cleanup(struct device *dev);
extern void device_links_no_driver(struct device *dev);
extern bool device_links_busy(struct device *dev);
extern void device_links_unbind_consumers(struct device *dev);
/* device pm support */
void device_pm_move_to_tail(struct device *dev);
int devtmpfs_create_node(struct device *dev);
int devtmpfs_delete_node(struct device *dev);
static inline int devtmpfs_create_node(struct device *dev) { return 0; }
static inline int devtmpfs_delete_node(struct device *dev) { return 0; }