Linux设备驱动总线关系概述

struct
bus_type {

const char
*name; // 总线名

struct bus_attribute
*bus_attrs; // 总线属性

struct device_attribute
*dev_attrs;

struct driver_attribute
*drv_attrs;

int (*match)(struct device *dev, struct device_driver *drv); // 匹配方法

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;

};

struct device {

struct device
*parent; // 当前设备的父类

struct device_private
*p;

struct kobject kobj;

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

const struct device_type *type;

struct mutex
mutex;

struct bus_type
*bus; /* type of bus device is on 设备所在的总线*//

struct device_driver *driver;
/* which driver has allocated this device ，该对象中包含操作设备的的方法*/

void
*platform_data;
/* Platform specific data, device core doesn't touch it，私有平台数据，给用户使用 */

struct dev_pm_info
power;

struct dev_power_domain
*pwr_domain;

/* arch specific additions */

struct dev_archdata
archdata;

struct device_node
*of_node; /* associated device tree node */

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); //当设备的最后一个引用被删除时，调用该函数

};

const char
*name; // 驱动名字

struct bus_type
*bus; // 所属总线

struct module
*owner;

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

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

const struct of_device_id
*of_match_table;// 设备id表，表示该驱动支持哪些型号的设备

int (*probe) (struct device *dev); // 当设备和驱动匹配的时候执行的方法

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;

};