demo.h

Linux 2.6核下的字符驱动示例。以简单的代码表现Linux的驱动程序结构

//demo.h
#ifndef _DEMO_H_
#define _DEMO_H_
//设备号
#define DEMO_MAJOR 224
#define DEMO_MINOR 0
//向设备下达的命令
#define COMMAND1 1
#define COMMAND2 2
//自己定义的设备结构 
struct DEMO_dev 
{
    struct cdev cdev;    /* Char device structure        */
};

//设备操作函数申明
ssize_t DEMO_read(struct file *filp, char __user *buf, size_t count,loff_t *f_pos);
ssize_t DEMO_write(struct file *filp, const char __user *buf, size_t count,loff_t *f_pos);
int DEMO_open(struct inode *inode, struct file *filp);
int DEMO_release(struct inode *inode, struct file *filp);
int DEMO_ioctl(struct inode *inode, struct file *filp,unsigned int cmd, unsigned long arg);

#endif /* _DEMO_H_ */