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; //自动注册驱动主装备 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! "); return 0; } static int Myleddrv_write(void) { return 0; } static struct file_operations Myleddrv_fops = { .owner = THIS_MODULE,/* 这是1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,告知内核 Myleddrv_class = class_create(THIS_MODULE,"Myleddrv"); Myleddrv_dev = device_create(Myleddrv_class,NULL,MKDEV(major,0),"Myleddrv"); /* /dev/Myleddrv */ return 0; } static void Myleddrv_exit(void) { unregister_chrdev(major,"Myleddrv"); // 卸载 printk("Myleddrv has been unregistered! "); device_unregister(Myleddrv_dev); device_destroy(Myleddrv_class,major); } module_init(Myleddrv_init); module_exit(Myleddrv_exit); MODULE_LICENSE("GPL");