device.h

xen 3.2.2 源码

/*
 * device.h - generic, centralized driver model
 *
 * Copyright (c) 2001-2003 Patrick Mochel <[e-mail]>
 *
 * This file is released under the GPLv2
 *
 * See Documentation/driver-model/ for more information.
 */

#ifndef _DEVICE_H_
#define _DEVICE_H_

#include <linux/ioport.h>
#include <linux/kobject.h>
#include <linux/klist.h>
#include <linux/list.h>
#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <asm/semaphore.h>
#include <asm/atomic.h>

#define DEVICE_NAME_SIZE	50
#define DEVICE_NAME_HALF	__stringify(20)	/* Less than half to accommodate slop */
#define DEVICE_ID_SIZE		32
#define BUS_ID_SIZE		KOBJ_NAME_LEN


struct device;
struct device_driver;
struct class;
struct class_device;

struct bus_type {
	const char		* name;

	struct subsystem	subsys;
	struct kset		drivers;
	struct kset		devices;
	struct klist		klist_devices;
	struct klist		klist_drivers;

	struct bus_attribute	* bus_attrs;
	struct device_attribute	* dev_attrs;
	struct driver_attribute	* drv_attrs;

	int		(*match)(struct device * dev, struct device_driver * drv);
	int		(*uevent)(struct device *dev, char **envp,
				  int num_envp, char *buffer, int buffer_size);
	int		(*probe)(struct device * dev);
	int		(*remove)(struct device * dev);
	void		(*shutdown)(struct device * dev);

	int (*suspend)(struct device * dev, pm_message_t state);
	int (*suspend_late)(struct device * dev, pm_message_t state);
	int (*resume_early)(struct device * dev);
	int (*resume)(struct device * dev);
};

extern int __must_check bus_register(struct bus_type * bus);
extern void bus_unregister(struct bus_type * bus);

extern int __must_check bus_rescan_devices(struct bus_type * bus);

/* iterator helpers for buses */

int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
		     int (*fn)(struct device *, void *));
struct device * bus_find_device(struct bus_type *bus, struct device *start,
				void *data, int (*match)(struct device *, void *));

int __must_check bus_for_each_drv(struct bus_type *bus,
		struct device_driver *start, void *data,
		int (*fn)(struct device_driver *, void *));

/* driverfs interface for exporting bus attributes */

struct bus_attribute {
#ifndef XEN
	struct attribute	attr;
#endif
	ssize_t (*show)(struct bus_type *, char * buf);
	ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
};

#define BUS_ATTR(_name,_mode,_show,_store)	\
struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store)

extern int __must_check bus_create_file(struct bus_type *,
					struct bus_attribute *);
extern void bus_remove_file(struct bus_type *, struct bus_attribute *);

struct device_driver {
	const char		* name;
	struct bus_type		* bus;

	struct completion	unloaded;
	struct kobject		kobj;
	struct klist		klist_devices;
	struct klist_node	knode_bus;

	struct module		* owner;

	int	(*probe)	(struct device * dev);
	int	(*remove)	(struct device * dev);
	void	(*shutdown)	(struct device * dev);
	int	(*suspend)	(struct device * dev, pm_message_t state);
	int	(*resume)	(struct device * dev);

	unsigned int multithread_probe:1;
};


extern int __must_check driver_register(struct device_driver * drv);
extern void driver_unregister(struct device_driver * drv);

extern struct device_driver * get_driver(struct device_driver * drv);
extern void put_driver(struct device_driver * drv);
extern struct device_driver *driver_find(const char *name, struct bus_type *bus);
extern int driver_probe_done(void);

/* driverfs interface for exporting driver attributes */

struct driver_attribute {
#ifndef XEN
	struct attribute	attr;
#endif
	ssize_t (*show)(struct device_driver *, char * buf);
	ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
};

#define DRIVER_ATTR(_name,_mode,_show,_store)	\
struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)

extern int __must_check driver_create_file(struct device_driver *,
					struct driver_attribute *);
extern void driver_remove_file(struct device_driver *, struct driver_attribute *);

extern int __must_check driver_for_each_device(struct device_driver * drv,
		struct device *start, void *data,
		int (*fn)(struct device *, void *));
struct device * driver_find_device(struct device_driver *drv,
				   struct device *start, void *data,
				   int (*match)(struct device *, void *));

/*
 * device classes
 */
struct class {
	const char		* name;
	struct module		* owner;

	struct subsystem	subsys;
	struct list_head	children;
	struct list_head	devices;
	struct list_head	interfaces;
#ifdef XEN
	spinlock_t		sem;
#else
	struct semaphore	sem;	/* locks both the children and interfaces lists */
#endif

	struct kobject		*virtual_dir;

	struct class_attribute		* class_attrs;
	struct class_device_attribute	* class_dev_attrs;
	struct device_attribute		* dev_attrs;

	int	(*uevent)(struct class_device *dev, char **envp,
			   int num_envp, char *buffer, int buffer_size);
	int	(*dev_uevent)(struct device *dev, char **envp, int num_envp,
				char *buffer, int buffer_size);

	void	(*release)(struct class_device *dev);
	void	(*class_release)(struct class *class);
	void	(*dev_release)(struct device *dev);

	int	(*suspend)(struct device *, pm_message_t state);
	int	(*resume)(struct device *);
};

extern int __must_check class_register(struct class *);
extern void class_unregister(struct class *);


struct class_attribute {
#ifndef XEN
	struct attribute	attr;
#endif
	ssize_t (*show)(struct class *, char * buf);
	ssize_t (*store)(struct class *, const char * buf, size_t count);
};

#define CLASS_ATTR(_name,_mode,_show,_store)			\
struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store) 

extern int __must_check class_create_file(struct class *,
					const struct class_attribute *);
extern void class_remove_file(struct class *, const struct class_attribute *);

struct class_device_attribute {
#ifndef XEN
	struct attribute	attr;
#endif
	ssize_t (*show)(struct class_device *, char * buf);
	ssize_t (*store)(struct class_device *, const char * buf, size_t count);
};

#define CLASS_DEVICE_ATTR(_name,_mode,_show,_store)		\
struct class_device_attribute class_device_attr_##_name = 	\
	__ATTR(_name,_mode,_show,_store)

extern int __must_check class_device_create_file(struct class_device *,
				    const struct class_device_attribute *);

/**
 * struct class_device - class devices
 * @class: pointer to the parent class for this class device.  This is required.
 * @devt: for internal use by the driver core only.
 * @node: for internal use by the driver core only.
 * @kobj: for internal use by the driver core only.
 * @devt_attr: for internal use by the driver core only.
 * @groups: optional additional groups to be created
 * @dev: if set, a symlink to the struct device is created in the sysfs
 * directory for this struct class device.
 * @class_data: pointer to whatever you want to store here for this struct
 * class_device.  Use class_get_devdata() and class_set_devdata() to get and
 * set this pointer.
 * @parent: pointer to a struct class_device that is the parent of this struct
 * class_device.  If NULL, this class_device will show up at the root of the
 * struct class in sysfs (which is probably what you want to have happen.)
 * @release: pointer to a release function for this struct class_device.  If
 * set, this will be called instead of the class specific release function.
 * Only use this if you want to override the default release function, like
 * when you are nesting class_device structures.
 * @uevent: pointer to a uevent function for this struct class_device.  If
 * set, this will be called instead of the class specific uevent function.
 * Only use this if you want to override the default uevent function, like
 * when you are nesting class_device structures.
 */
struct class_device {
	struct list_head	node;