linux常用头文件之--linux/device.h

在device.h文件中 又给提供了那些函数呢？

在这个头文件中包含了 bus的一些函数 和 drifver的一些函数，以及class_create()等函数

/*源代码**/

/*

* device.h - generic, centralized driver model

*

* Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>

* Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>

* Copyright (c) 2008-2009 Novell Inc.

*

* 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/lockdep.h>

#include <linux/compiler.h>

#include <linux/types.h>

#include <linux/module.h>

#include <linux/pm.h>

#include <asm/atomic.h>

#include <asm/device.h>

struct device;

struct device_private;

struct device_driver;

struct driver_private;

struct class;

struct subsys_private;

struct bus_type;

struct device_node;

struct bus_attribute {

struct attribute
attr;

ssize_t (*show)(struct bus_type *bus, char *buf);

ssize_t (*store)(struct bus_type *bus, 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 bus_type {

const char
*name;

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, struct kobj_uevent_env *env);

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);

const struct dev_pm_ops *pm;

struct subsys_private *p;

};

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 *dev, void *data));

struct device *bus_find_device(struct bus_type *bus, struct device *start,

void *data,

int (*match)(struct device *dev, void *data));

struct device *bus_find_device_by_name(struct bus_type *bus,

struct device *start,

const char *name);

int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,

void *data, int (*fn)(struct device_driver *, void *));

void bus_sort_breadthfirst(struct bus_type *bus,

int (*compare)(const struct device *a,

const struct device *b));

/*

* Bus notifiers: Get notified of addition/removal of devices

* and binding/unbinding of drivers to devices.

* In the long run, it should be a replacement for the platform

* notify hooks.

*/

struct notifier_block;

extern int bus_register_notifier(struct bus_type *bus,

struct notifier_block *nb);

extern int bus_unregister_notifier(struct bus_type *bus,

struct notifier_block *nb);

/* All 4 notifers below get called with the target struct device *

* as an argument. Note that those functions are likely to be called

* with the device lock held in the core, so be careful.

*/

#define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */

#define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */

#define BUS_NOTIFY_BIND_DRIVER 0x00000003 /* driver about to be

bound */

#define BUS_NOTIFY_BOUND_DRIVER 0x00000004 /* driver bound to device */

#define BUS_NOTIFY_UNBIND_DRIVER 0x00000005 /* driver about to be

unbound */

#define BUS_NOTIFY_UNBOUND_DRIVER 0x00000006 /* driver is unbound

from the device */

extern struct kset *bus_get_kset(struct bus_type *bus);

extern struct klist *bus_get_device_klist(struct bus_type *bus);

struct device_driver {

const char
*name;

struct bus_type
*bus;

struct module
*owner;

const char
*mod_name; /* used for built-in modules */

bool suppress_bind_attrs;
/* disables bind/unbind via sysfs */

#if defined(CONFIG_OF)

const struct of_device_id
*of_match_table;

#endif

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);

const struct attribute_group **groups;

const struct dev_pm_ops *pm;

struct driver_private *p;

};

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);

extern void wait_for_device_probe(void);

/* sysfs interface for exporting driver attributes */

struct driver_attribute {

struct attribute attr;

ssize_t (*show)(struct device_driver *driver, char *buf);

ssize_t (*store)(struct device_driver *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 *driver,

const struct driver_attribute *attr);

extern void driver_remove_file(struct device_driver *driver,

const struct driver_attribute *attr);

extern int __must_check driver_add_kobj(struct device_driver *drv,

struct kobject *kobj,

const char *fmt, ...);

extern int __must_check driver_for_each_device(struct device_driver *drv,

struct device *start,

void *data,

int (*fn)(struct device *dev,

void *));

struct device *driver_find_device(struct device_driver *drv,

struct device *start, void *data,

int (*match)(struct device *dev, void *data));

/*

* device classes

*/

struct class {

const char
*name;

struct module
*owner;

struct class_attribute
*class_attrs;

struct device_attribute
*dev_attrs;

struct bin_attribute
*dev_bin_attrs;

struct kobject
*dev_kobj;

int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);

char *(*devnode)(struct device *dev, mode_t *mode);

void (*class_release)(struct class *class);

void (*dev_release)(struct device *dev);

int (*suspend)(struct device *dev, pm_message_t state);

int (*resume)(struct device *dev);

const struct kobj_ns_type_operations *ns_type;

const void *(*namespace)(struct device *dev);

const struct dev_pm_ops *pm;

struct subsys_private *p;

};

struct class_dev_iter {

struct klist_iter
ki;

const struct device_type
*type;

};

extern struct kobject *sysfs_dev_block_kobj;

extern struct kobject *sysfs_dev_char_kobj;

extern int __must_check __class_register(struct class *class,

struct lock_class_key *key);

extern void class_unregister(struct class *class);

/* This is a #define to keep the compiler from merging different

* instances of the __key variable */

#define class_register(class) \

({ \

static struct lock_class_key __key;
\

__class_register(class, &__key);
\

})

struct class_compat;

struct class_compat *class_compat_register(const char *name);

void class_compat_unregister(struct class_compat *cls);

int class_compat_create_link(struct class_compat *cls, struct device *dev,

struct device *device_link);

void class_compat_remove_link(struct class_compat *cls, struct device *dev,

struct device *device_link);

extern void class_dev_iter_init(struct class_dev_iter *iter,

struct class *class,

struct device *start,

const struct device_type *type);

extern struct device *class_dev_iter_next(struct class_dev_iter *iter);

extern void class_dev_iter_exit(struct class_dev_iter *iter);

extern int class_for_each_device(struct class *class, struct device *start,

void *data,

int (*fn)(struct device *dev, void *data));

extern struct device *class_find_device(struct class *class,

struct device *start, void *data,

int (*match)(struct device *, void *));

struct class_attribute {

struct attribute attr;

ssize_t (*show)(struct class *class, struct class_attribute *attr,

char *buf);

ssize_t (*store)(struct class *class, struct class_attribute *attr,

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 *class,

const struct class_attribute *attr);

extern void class_remove_file(struct class *class,

const struct class_attribute *attr);

/* Simple class attribute that is just a static string */

struct class_attribute_string {

struct class_attribute attr;

char *str;

};

/* Currently read-only only */

#define _CLASS_ATTR_STRING(_name, _mode, _str) \

{ __ATTR(_name, _mode, show_class_attr_string, NULL), _str }

#define CLASS_ATTR_STRING(_name, _mode, _str) \

struct class_attribute_string class_attr_##_name = \

_CLASS_ATTR_STRING(_name, _mode, _str)

extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,

char *buf);

struct class_interface {

struct list_head
node;

struct class
*class;

int (*add_dev)
(struct device *, struct class_interface *);

void (*remove_dev)
(struct device *, struct class_interface *);

};

extern int __must_check class_interface_register(struct class_interface *);

extern void class_interface_unregister(struct class_interface *);

extern struct class * __must_check __class_create(struct module *owner,

const char *name,

struct lock_class_key *key);

extern void class_destroy(struct class *cls);

/* This is a #define to keep the compiler from merging different

* instances of the __key variable */

#define class_create(owner, name) \

({ \

static struct lock_class_key __key;
\

__class_create(owner, name, &__key);
\

})

/*

* The type of device, "struct device" is embedded in. A class

* or bus can contain devices of different types

* like "partitions" and "disks", "mouse" and "event".

* This identifies the device type and carries type-specific

* information, equivalent to the kobj_type of a kobject.

* If "name" is specified, the uevent will contain it in

* the DEVTYPE variable.

*/

struct device_type {

const char *name;

const struct attribute_group **groups;

int (*uevent)(struct device *dev, struct kobj_uevent_env *env);

char *(*devnode)(struct device *dev, mode_t *mode);

void (*release)(struct device *dev);

const struct dev_pm_ops *pm;

};

/* interface for exporting device attributes */

struct device_attribute {

struct attribute
attr;

ssize_t (*show)(struct device *dev, struct device_attribute *attr,

char *buf);

ssize_t (*store)(struct device *dev, struct device_attribute *attr,

const char *buf, size_t count);

};

#define DEVICE_ATTR(_name, _mode, _show, _store) \

struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)

extern int __must_check device_create_file(struct device *device,

const struct device_attribute *entry);

extern void device_remove_file(struct device *dev,

const struct device_attribute *attr);

extern int __must_check device_create_bin_file(struct device *dev,

const struct bin_attribute *attr);

extern void device_remove_bin_file(struct device *dev,

const struct bin_attribute *attr);

extern int device_schedule_callback_owner(struct device *dev,

void (*func)(struct device *dev), struct module *owner);

/* This is a macro to avoid include problems with THIS_MODULE */

#define device_schedule_callback(dev, func)
\

device_schedule_callback_owner(dev, func, THIS_MODULE)

/* device resource management */

typedef void (*dr_release_t)(struct device *dev, void *res);

typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);

#ifdef CONFIG_DEBUG_DEVRES

extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,

const char *name);

#define devres_alloc(release, size, gfp) \

__devres_alloc(release, size, gfp, #release)

#else

extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);

#endif

extern void devres_free(void *res);

extern void devres_add(struct device *dev, void *res);

extern void *devres_find(struct device *dev, dr_release_t release,

dr_match_t match, void *match_data);

extern void *devres_get(struct device *dev, void *new_res,

dr_match_t match, void *match_data);

extern void *devres_remove(struct device *dev, dr_release_t release,

dr_match_t match, void *match_data);

extern int devres_destroy(struct device *dev, dr_release_t release,

dr_match_t match, void *match_data);

/* devres group */

extern void * __must_check devres_open_group(struct device *dev, void *id,

gfp_t gfp);

extern void devres_close_group(struct device *dev, void *id);

extern void devres_remove_group(struct device *dev, void *id);

extern int devres_release_group(struct device *dev, void *id);

/* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */

extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);

extern void devm_kfree(struct device *dev, void *p);

struct device_dma_parameters {

/*

* a low level driver may set these to teach IOMMU code about

* sg limitations.

*/

unsigned int max_segment_size;

unsigned long segment_boundary_mask;

};

struct device {

struct device
*parent;

struct device_private
*p;

struct kobject kobj;

const char
*init_name; /* initial name of the device */

struct device_type
*type;

struct mutex
mutex; /* mutex to synchronize calls to

* its driver.

*/

struct bus_type
*bus; /* type of bus device is on */

struct device_driver *driver;
/* which driver has allocated this

device */

void *platform_data;
/* Platform specific data, device

core doesn't touch it */

struct dev_pm_info
power;

#ifdef CONFIG_NUMA

int numa_node;
/* NUMA node this device is close to */

#endif

u64 *dma_mask;
/* dma mask (if dma'able device) */

u64 coherent_dma_mask;/* Like dma_mask, but for

alloc_coherent mappings as

not all hardware supports

64 bit addresses for consistent

allocations such descriptors. */

struct device_dma_parameters *dma_parms;

struct list_head
dma_pools; /* dma pools (if dma'ble) */

struct dma_coherent_mem
*dma_mem; /* internal for coherent mem

override */

/* arch specific additions */

struct dev_archdata
archdata;

#ifdef CONFIG_OF

struct device_node
*of_node;

#endif

dev_t devt;
/* dev_t, creates the sysfs "dev" */

spinlock_t
devres_lock;

struct list_head
devres_head;

struct klist_node
knode_class;

struct class
*class;

const struct attribute_group **groups;
/* optional groups */

void (*release)(struct device *dev);

};

/* Get the wakeup routines, which depend on struct device */

#include <linux/pm_wakeup.h>

static inline const char *dev_name(const struct device *dev)

{

/* Use the init name until the kobject becomes available */

if (dev->init_name)

return dev->init_name;

return kobject_name(&dev->kobj);

}

extern int dev_set_name(struct device *dev, const char *name, ...)

__attribute__((format(printf, 2, 3)));

#ifdef CONFIG_NUMA

static inline int dev_to_node(struct device *dev)

{

return dev->numa_node;

}

static inline void set_dev_node(struct device *dev, int node)

{

dev->numa_node = node;

}

#else

static inline int dev_to_node(struct device *dev)

{

return -1;

}

static inline void set_dev_node(struct device *dev, int node)

{

}

#endif

static inline unsigned int dev_get_uevent_suppress(const struct device *dev)

{

return dev->kobj.uevent_suppress;

}

static inline void dev_set_uevent_suppress(struct device *dev, int val)

{

dev->kobj.uevent_suppress = val;

}

static inline int device_is_registered(struct device *dev)

{

return dev->kobj.state_in_sysfs;

}

static inline void device_enable_async_suspend(struct device *dev)

{

if (!dev->power.in_suspend)

dev->power.async_suspend = true;

}

static inline void device_disable_async_suspend(struct device *dev)

{

if (!dev->power.in_suspend)

dev->power.async_suspend = false;

}

static inline bool device_async_suspend_enabled(struct device *dev)

{

return !!dev->power.async_suspend;

}

static inline void device_lock(struct device *dev)

{

mutex_lock(&dev->mutex);

}

static inline int device_trylock(struct device *dev)

{

return mutex_trylock(&dev->mutex);

}

static inline void device_unlock(struct device *dev)

{

mutex_unlock(&dev->mutex);

}

void driver_init(void);

/*

* High level routines for use by the bus drivers

*/

extern int __must_check device_register(struct device *dev);

extern void device_unregister(struct device *dev);

extern void device_initialize(struct device *dev);

extern int __must_check device_add(struct device *dev);

extern void device_del(struct device *dev);

extern int device_for_each_child(struct device *dev, void *data,

int (*fn)(struct device *dev, void *data));

extern struct device *device_find_child(struct device *dev, void *data,

int (*match)(struct device *dev, void *data));

extern int device_rename(struct device *dev, const char *new_name);

extern int device_move(struct device *dev, struct device *new_parent,

enum dpm_order dpm_order);

extern const char *device_get_devnode(struct device *dev,

mode_t *mode, const char **tmp);

extern void *dev_get_drvdata(const struct device *dev);

extern void dev_set_drvdata(struct device *dev, void *data);

/*

* Root device objects for grouping under /sys/devices

*/

extern struct device *__root_device_register(const char *name,

struct module *owner);

static inline struct device *root_device_register(const char *name)

{

return __root_device_register(name, THIS_MODULE);

}

extern void root_device_unregister(struct device *root);

static inline void *dev_get_platdata(const struct device *dev)

{

return dev->platform_data;

}

/*

* Manual binding of a device to driver. See drivers/base/bus.c

* for information on use.

*/

extern int __must_check device_bind_driver(struct device *dev);

extern void device_release_driver(struct device *dev);

extern int __must_check device_attach(struct device *dev);

extern int __must_check driver_attach(struct device_driver *drv);

extern int __must_check device_reprobe(struct device *dev);

/*

* Easy functions for dynamically creating devices on the fly

*/

extern struct device *device_create_vargs(struct class *cls,

struct device *parent,

dev_t devt,

void *drvdata,

const char *fmt,

va_list vargs);

extern struct device *device_create(struct class *cls, struct device *parent,

dev_t devt, void *drvdata,

const char *fmt, ...)

__attribute__((format(printf, 5, 6)));

extern void device_destroy(struct class *cls, dev_t devt);

/*

* Platform "fixup" functions - allow the platform to have their say

* about devices and actions that the general device layer doesn't

* know about.

*/

/* Notify platform of device discovery */

extern int (*platform_notify)(struct device *dev);

extern int (*platform_notify_remove)(struct device *dev);

/**

* get_device - atomically increment the reference count for the device.

*

*/

extern struct device *get_device(struct device *dev);

extern void put_device(struct device *dev);

extern void wait_for_device_probe(void);

#ifdef CONFIG_DEVTMPFS

extern int devtmpfs_create_node(struct device *dev);

extern int devtmpfs_delete_node(struct device *dev);

extern int devtmpfs_mount(const char *mntdir);

#else

static inline int devtmpfs_create_node(struct device *dev) { return 0; }

static inline int devtmpfs_delete_node(struct device *dev) { return 0; }

static inline int devtmpfs_mount(const char *mountpoint) { return 0; }

#endif

/* drivers/base/power/shutdown.c */

extern void device_shutdown(void);

/* drivers/base/sys.c */

extern void sysdev_shutdown(void);

/* debugging and troubleshooting/diagnostic helpers. */

extern const char *dev_driver_string(const struct device *dev);

#ifdef CONFIG_PRINTK

extern int dev_printk(const char *level, const struct device *dev,

const char *fmt, ...)

__attribute__ ((format (printf, 3, 4)));

extern int dev_emerg(const struct device *dev, const char *fmt, ...)

__attribute__ ((format (printf, 2, 3)));

extern int dev_alert(const struct device *dev, const char *fmt, ...)

__attribute__ ((format (printf, 2, 3)));

extern int dev_crit(const struct device *dev, const char *fmt, ...)

__attribute__ ((format (printf, 2, 3)));

extern int dev_err(const struct device *dev, const char *fmt, ...)

__attribute__ ((format (printf, 2, 3)));

extern int dev_warn(const struct device *dev, const char *fmt, ...)

__attribute__ ((format (printf, 2, 3)));

extern int dev_notice(const struct device *dev, const char *fmt, ...)

__attribute__ ((format (printf, 2, 3)));

extern int _dev_info(const struct device *dev, const char *fmt, ...)

__attribute__ ((format (printf, 2, 3)));

#else

static inline int dev_printk(const char *level, const struct device *dev,

const char *fmt, ...)

__attribute__ ((format (printf, 3, 4)));

static inline int dev_printk(const char *level, const struct device *dev,

const char *fmt, ...)

{ return 0; }

static inline int dev_emerg(const struct device *dev, const char *fmt, ...)

__attribute__ ((format (printf, 2, 3)));

static inline int dev_emerg(const struct device *dev, const char *fmt, ...)

{ return 0; }

static inline int dev_crit(const struct device *dev, const char *fmt, ...)

__attribute__ ((format (printf, 2, 3)));

static inline int dev_crit(const struct device *dev, const char *fmt, ...)

{ return 0; }

static inline int dev_alert(const struct device *dev, const char *fmt, ...)

__attribute__ ((format (printf, 2, 3)));

static inline int dev_alert(const struct device *dev, const char *fmt, ...)

{ return 0; }

static inline int dev_err(const struct device *dev, const char *fmt, ...)

__attribute__ ((format (printf, 2, 3)));

static inline int dev_err(const struct device *dev, const char *fmt, ...)

{ return 0; }

static inline int dev_warn(const struct device *dev, const char *fmt, ...)

__attribute__ ((format (printf, 2, 3)));

static inline int dev_warn(const struct device *dev, const char *fmt, ...)

{ return 0; }

static inline int dev_notice(const struct device *dev, const char *fmt, ...)

__attribute__ ((format (printf, 2, 3)));

static inline int dev_notice(const struct device *dev, const char *fmt, ...)

{ return 0; }

static inline int _dev_info(const struct device *dev, const char *fmt, ...)

__attribute__ ((format (printf, 2, 3)));

static inline int _dev_info(const struct device *dev, const char *fmt, ...)

{ return 0; }

#endif

/*

* Stupid hackaround for existing uses of non-printk uses dev_info

*

* Note that the definition of dev_info below is actually _dev_info

* and a macro is used to avoid redefining dev_info

*/

#define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)

#if defined(DEBUG)

#define dev_dbg(dev, format, arg...) \

dev_printk(KERN_DEBUG, dev, format, ##arg)

#elif defined(CONFIG_DYNAMIC_DEBUG)

#define dev_dbg(dev, format, ...) \

do { \

dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \

} while (0)

#else

#define dev_dbg(dev, format, arg...) \

({ \

if (0)
\

dev_printk(KERN_DEBUG, dev, format, ##arg);
\

0; \

})

#endif

#ifdef VERBOSE_DEBUG

#define dev_vdbg dev_dbg

#else

#define dev_vdbg(dev, format, arg...) \

({ \

if (0)
\

dev_printk(KERN_DEBUG, dev, format, ##arg);
\

0; \

})

#endif

/*

* dev_WARN() acts like dev_printk(), but with the key difference

* of using a WARN/WARN_ON to get the message out, including the

* file/line information and a backtrace.

*/

#define dev_WARN(dev, format, arg...) \

WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);

/* Create alias, so I can be autoloaded. */

#define MODULE_ALIAS_CHARDEV(major,minor) \

MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))

#define MODULE_ALIAS_CHARDEV_MAJOR(major) \

MODULE_ALIAS("char-major-" __stringify(major) "-*")

#ifdef CONFIG_SYSFS_DEPRECATED

extern long sysfs_deprecated;

#else

#define sysfs_deprecated 0

#endif

#endif /* _DEVICE_H_ */