自动注册设备udev方法

#include<linux/module.h>
#include<linux/init.h>
#include<linux/types.h>
#include<asm/io.h>
#include<linux/sched.h>
#include<linux/string.h>
#include<linux/major.h>
#include<linux/device.h>
#include<linux/cdev.h>

MODULE_AUTHOR("AW");
MODULE_LICENSE("GPL");

unsigned int addr;

int major=251;
struct class *myclass;
static int hello_init(void)
{

    printk("<1>class create!");
    myclass=class_create(THIS_MODULE,"my_deriver2");

    if(IS_ERR(myclass))
    {
              printk("failed to creat class\n ");
              return -1;
    }

    device_create(myclass,NULL,MKDEV(major,0),NULL,"my_device_deriver%d",5);
    printk("<1>after device_create register!");
    return 0;
}

static void hello_exit(void)
{
    device_destroy(myclass, MKDEV(major, 0));
    printk(KERN_DEBUG "Good-bye, kernel!\n");
}

module_init(hello_init);
module_exit(hello_exit);

Makefile:

obj-m:=hello1.o
KERNELDIR:=/lib/modules/$(shell uname -r)/build
PWD:=$(shell pwd)
modules:
    $(MAKE) -C $(KERNELDIR) M=$(PWD) ARCH=i386 CROSS_COMPILE=

clean:
    rm  *.o *mod.o *.order *.mod.c  *symvers -f