一步一步学习Linux驱动之自动创建设备节点

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <asm/uaccess.h>
#include <asm/irq.h>
#include <asm/io.h>

#include <linux/poll.h>
#include <linux/device.h>


static struct class  *Myleddrv_class;   //自动注册驱动主设备
static struct device *Myleddrv_dev;

volatile unsigned long *gpbcon = NULL; //控制寄存器
volatile unsigned long *gpbdat = NULL; //数据寄存器

static int Myleddrv_open(void)
{
	printk("Hello Linux World!\n");
	return 0;
}

static int Myleddrv_write(void)
{
	return 0;
}

static struct file_operations Myleddrv_fops = {
    .owner  =   THIS_MODULE,    /* 这是一个宏，推向编译模块时自动创建的__this_module变量 */
    .open   =   Myleddrv_open,     
	.write	=	Myleddrv_write,	   
};

static int major; //全局变量

static int Myleddrv_init(void)
{
	major = register_chrdev(0, "Myleddrv", &Myleddrv_fops); // 注册, 告诉内核

	Myleddrv_class = class_create(THIS_MODULE, "Myleddrv");

	Myleddrv_dev = device_create(Myleddrv_class, NULL, MKDEV(major, 0), NULL, "Myleddrv"); /* /dev/Myleddrv */

	return 0;
}


static void Myleddrv_exit(void)
{
	unregister_chrdev(major, "Myleddrv"); // 卸载
	printk("Myleddrv has been unregistered!\n");
	device_unregister(Myleddrv_dev);
	device_destroy(Myleddrv_class,major);	
}

module_init(Myleddrv_init);
module_exit(Myleddrv_exit);

MODULE_LICENSE("GPL");