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【转】一个2.6内核字符设备驱动hello world 注释超详细

zz from: http://hi.baidu.com/deep_pro/blog/item/b451e687101a302cc65cc390.html

一个2.6内核字符设备驱动hello world 注释超详细
2008-07-17 17:02

本例是冯国进的 《嵌入式Linux 驱动程序设计从入门到精通》的第一个例子
感觉真是好书   强烈推荐

这个驱动是在内存中分配一个256字节的空间，供用户态应用程序读写。

先是头文件 demo.h


#ifndef _DEMO_H_
#define _DEMO_H_

#include <linux/ioctl.h> /* needed for the _IOW etc stuff used later */

/********************************************************
* Macros to help debugging
********************************************************/
#undef PDEBUG             /* undef it, just in case */
#ifdef DEMO_DEBUG
#ifdef __KERNEL__
#    define PDEBUG(fmt, args...) printk( KERN_DEBUG "DEMO: " fmt, ## args)
#else//usr space
#    define PDEBUG(fmt, args...) fprintf(stderr, fmt, ## args)

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