/**
* struct bus_type_private - structure to hold the private to the driver core portions of the bus_type structure.
*
* @subsys - the struct kset that defines this bus. This is the main kobject
* @drivers_kset - the list of drivers associated with this bus
* @devices_kset - the list of devices associated with this bus
* @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.
*
* This structure is the one that is the actual kobject allowing struct
* bus_type to be statically allocated safely. Nothing outside of the driver
* core should ever touch these fields.
*/
struct bus_type_private {
struct kset subsys; //用来描述总线的kset。
struct kset *drivers_kset; //和bus_type相关的驱动的kset集合
struct kset *devices_kset;//和bus_type相关的设备的kset集合
struct klist klist_devices;
struct klist klist_drivers;
struct blocking_notifier_head bus_notifier;
unsigned int drivers_autoprobe:1;
struct bus_type *bus;
* struct bus_type_private - structure to hold the private to the driver core portions of the bus_type structure.
*
* @subsys - the struct kset that defines this bus. This is the main kobject
* @drivers_kset - the list of drivers associated with this bus
* @devices_kset - the list of devices associated with this bus
* @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.
*
* This structure is the one that is the actual kobject allowing struct
* bus_type to be statically allocated safely. Nothing outside of the driver
* core should ever touch these fields.
*/
struct bus_type_private {
struct kset subsys; //用来描述总线的kset。
struct kset *drivers_kset; //和bus_type相关的驱动的kset集合
struct kset *devices_kset;//和bus_type相关的设备的kset集合
struct klist klist_devices;
struct klist klist_drivers;
struct blocking_notifier_head bus_notifier;
unsigned int drivers_autoprobe:1;
struct bus_type *bus;
};
/*bus_type结构体用来描述总线。*/
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 bus_type_private *p;//这个私有指针包含了kset
};
Sysfs文件系统是一个类 似于proc文件系统的特殊文件系统,用于将系统中的设备组织成层次结构,并向用户模式程序提供详细的内核数据结构信息。