创建kobject

1、kobject介绍

kobject的全称是kernel object，即内核对象。每一个kobject都会对应系统/sys/下的一个目录。

2、相关结构体和api介绍

2.1 struct kobject

// include/linux/kobject.h

2.2 kobject_create_and_add

kobject_create_and_addkobject_createkobject_addkobject_add_varg

2.3 kobject_init_and_add

kobject_init_and_addkobject_initkobject_init_internalkobject_add_varg

2.4 kobject_put

kobject_putkref_putkref_sub

3、实验操作

#include<linux/module.h>
#include<linux/init.h>
#include<linux/kernel.h>
#include<linux/kobject.h>
#include<linux/slab.h>struct kobject *my_kobject01;
struct kobject *my_kobject02;
struct kobject *my_kobject03;
struct kobj_type mytype;/*
创建kobject的两种方法：
1、kobject_create_and_add
2、kzalloc->kobject_init_and_add
*/
static int my_kobject_init(void)
{int ret;my_kobject01 = kobject_create_and_add("my_kobject01",NULL); // /sys/my_kobject01my_kobject02 = kobject_create_and_add("my_kobject02",my_kobject01); // /sys/my_kobject01/my_kobject02my_kobject03 = kzalloc(sizeof(struct kobject),GFP_KERNEL);ret = kobject_init_and_add(my_kobject03,&mytype,NULL,"%s","my_kobject03");// /sys/my_kobject03return 0;
}static void my_kobject_exit(void)
{kobject_put(my_kobject01);kobject_put(my_kobject02);kobject_put(my_kobject03);
}module_init(my_kobject_init);
module_exit(my_kobject_exit);
MODULE_LICENSE("GPL");

//Makefile
obj-m += kobject.o
KDIR := /home/johan/share/rk3588/linux_sdk/kernel
PWD ?= $(shell pwd)
all:make -C $(KDIR) M=$(PWD) modulesclean:rm -f *.ko *.o *.mod.o *.mod.c