base.h 5.8 KB
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/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/notifier.h>
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/**
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 * struct subsys_private - structure to hold the private to the driver core portions of the bus_type/class structure.
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 *
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 * @subsys - the struct kset that defines this subsystem
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 * @devices_kset - the subsystem's 'devices' directory
 * @interfaces - list of subsystem interfaces associated
 * @mutex - protect the devices, and interfaces lists.
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 *
 * @drivers_kset - the list of drivers associated
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 * @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
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 *                 on this bus.
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 * @bus - pointer back to the struct bus_type that this structure is associated
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 *        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.
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 *
 * This structure is the one that is the actual kobject allowing struct
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 * bus_type/class to be statically allocated safely.  Nothing outside of the
 * driver core should ever touch these fields.
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 */
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struct subsys_private {
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	struct kset subsys;
	struct kset *devices_kset;
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	struct list_head interfaces;
	struct mutex mutex;
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	struct kset *drivers_kset;
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	struct klist klist_devices;
	struct klist klist_drivers;
	struct blocking_notifier_head bus_notifier;
	unsigned int drivers_autoprobe:1;
	struct bus_type *bus;
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	struct kset glue_dirs;
	struct class *class;
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};
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#define to_subsys_private(obj) container_of(obj, struct subsys_private, subsys.kobj)
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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)
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/**
 * struct device_private - structure to hold the private to the driver core portions of the device structure.
 *
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 * @klist_children - klist containing all children of this device
 * @knode_parent - node in sibling list
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 * @knode_driver - node in driver list
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 * @knode_bus - node in bus list
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 * @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.
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 * @device - pointer back to the struct device that this structure is
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 * associated with.
 *
 * Nothing outside of the driver core should ever touch these fields.
 */
struct device_private {
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	struct klist klist_children;
	struct klist_node knode_parent;
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	struct klist_node knode_driver;
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	struct klist_node knode_bus;
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	struct list_head deferred_probe;
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	struct device *device;
};
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#define to_device_private_parent(obj)	\
	container_of(obj, struct device_private, knode_parent)
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#define to_device_private_driver(obj)	\
	container_of(obj, struct device_private, knode_driver)
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#define to_device_private_bus(obj)	\
	container_of(obj, struct device_private, knode_bus)
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/* initialisation functions */
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extern int devices_init(void);
extern int buses_init(void);
extern int classes_init(void);
extern int firmware_init(void);
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#ifdef CONFIG_SYS_HYPERVISOR
extern int hypervisor_init(void);
#else
static inline int hypervisor_init(void) { return 0; }
#endif
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extern int platform_bus_init(void);
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extern void cpu_dev_init(void);
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extern void container_dev_init(void);
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struct kobject *virtual_device_parent(struct device *dev);

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extern int bus_add_device(struct device *dev);
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extern void bus_probe_device(struct device *dev);
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extern void bus_remove_device(struct device *dev);
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extern int bus_add_driver(struct device_driver *drv);
extern void bus_remove_driver(struct device_driver *drv);
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extern void device_release_driver_internal(struct device *dev,
					   struct device_driver *drv,
					   struct device *parent);
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extern void driver_detach(struct device_driver *drv);
extern int driver_probe_device(struct device_driver *drv, struct device *dev);
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extern void driver_deferred_probe_del(struct device *dev);
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static inline int driver_match_device(struct device_driver *drv,
				      struct device *dev)
{
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	return drv->bus->match ? drv->bus->match(dev, drv) : 1;
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}
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extern bool driver_allows_async_probing(struct device_driver *drv);
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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);

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extern char *make_class_name(const char *name, struct kobject *kobj);
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extern int devres_release_all(struct device *dev);
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extern void device_block_probing(void);
extern void device_unblock_probing(void);
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/* /sys/devices directory */
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extern struct kset *devices_kset;
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extern void devices_kset_move_last(struct device *dev);
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#if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS)
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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
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#ifdef CONFIG_DEVTMPFS
extern int devtmpfs_init(void);
#else
static inline int devtmpfs_init(void) { return 0; }
#endif
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/* Device links support */
extern int device_links_read_lock(void);
extern void device_links_read_unlock(int idx);
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);
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/* device pm support */
void device_pm_move_to_tail(struct device *dev);