mymod.c

让大家如何在linux下编写一个自己模块

/* 开始例行公事 */
#ifndef __KERNEL__
#define __KERNEL__
#endif
#ifndef MODULE
#define MODULE
#endif
#include <linux/config.h>
#include <linux/module.h>
#ifdef CONFIG_SMP
#define __SMP__
#endif
/* 结束例行公事 */


/*头文件*/
#include <asm/uaccess.h> 	/* copy_to_user(), copy_from_user */
#include <linux/fs.h> 		/* struct file_operations, register_chrdev(), ... */
#include <linux/kernel.h> 	/* printk()在这个文件里 */
#include <linux/sched.h> 	/* 和任务调度有关 */
#include <linux/types.h> 	/* u8, u16, u32 ... */
#include <linux/mm.h> 	/* GFP_KERNEL */

#include "led/led.h"


/*函数向前声明*/
static ssize_t MyModRead(struct file *filp,char *buf,size_t count,loff_t *f_pos);
static ssize_t MyModWrite(struct file *filp,const char *buf,size_t count,loff_t *f_pos);


/*宏定义*/
#define MyModName	"mod"


/*初始化函数入口*/
struct file_operations g_MyModOps= {
	owner	: THIS_MODULE,
	read	: MyModRead,
	write	: MyModWrite,
};


/*全局的主设备号*/
static u32 g_nDevMajor;



/*函数实现*/
static ssize_t MyModRead(struct file *filp,char *buf,size_t count,loff_t *f_pos)
{
	printk("Read!\n");
	Status(1);
	return 0;
}

static ssize_t MyModWrite(struct file *filp,const char *buf,size_t count,loff_t *f_pos)
{		
	printk("Write!\n");
	Status(4);
	return count;
}



static  int init_module()
{
	int temp;
	
	g_nDevMajor=register_chrdev(253,MyModName,&g_MyModOps);
	if(g_nDevMajor< 0)	return g_nDevMajor; 
	
	init_led();
	
	printk("Init success!\n");

	return 0; 
}


static  void cleanup_module()
{
	unregister_chrdev(g_nDevMajor,MyModName);
}



MODULE_LICENSE("GPL");
MODULE_AUTHOR("[e-mail]");