驱动 实现三盏灯开关

#ifndef __H__
#define __H__
#define LED_MODERE 0X50006000
#define LED_MODERF 0X50007000
#define LED_ODRE   0X50006014
#define LED_ODRF   0X50007014
#define LED_RCC   0X50000A28
 
#endif

#include<stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<unistd.h>
#include<stdlib.h>
#include<string.h>
#include "head.h"
int main(int argc, const char *argv[])
{
	char buf[128]="";
	int fd=open("/dev/mychrdev",O_RDWR);
	if(fd<0)
	{
		printf("设备文件打开失败\n");
		exit(-1);
	}
	while(1)
	{
	printf("请开灯关灯（0/1）\n");
	fgets(buf,sizeof(buf),stdin);
	buf[strlen(buf)-1]='\0';	
	write(fd,buf,sizeof(buf));
	memset(buf,0,sizeof(buf));
	read(fd,buf,sizeof(buf));
	}
	close(fd);
	return 0;
}

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/compiler.h>
#include <linux/io.h>
#include "head.h"
unsigned int major;
char kbuf[128]="";
unsigned int *vir_modere;
unsigned int *vir_moderf;
unsigned int *vir_rcc;
unsigned int *vir_odre;
unsigned int *vir_odrf;
int mycdev_open(struct inode *inode,struct file *file)
{
	printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
	return 0;
}
ssize_t mycdev_read(struct file *file,char *ubuf,size_t size,loff_t *lof)
{
	int ret;
	ret=copy_to_user(ubuf,kbuf,size);
	if(ret)
	{
		printk("copy_from_user err\n");
		return -EIO;
	}
	printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
	return 0;
}
ssize_t mycdev_write(struct file *file,const char *ubuf,size_t size,loff_t *lof)
{
	int ret;
	ret=copy_from_user(kbuf,ubuf,size);
	if(ret)
	{
		printk("copy_from_user err\n");
		return -EIO;	
	}
	if(kbuf[0]=='1')
	{
		//开灯
		//led1
		(*vir_odre) |= (0x1<<10);
		//led2
		(*vir_odrf) |= (0x1<<10);
		//led3
		(*vir_odre) |= (0x1<<8);
		printk("开灯-->%d\n",*kbuf);
	}
	else if(kbuf[0]=='0')
	{
		//关灯
		//led1
		(*vir_odre) &= (~(0x1<<10));
		//led2
		(*vir_odrf) &= (~(0x1<<10));
		//led3
		(*vir_odre) &= (~(0x1<<8));
		printk("关灯-->%d\n",*kbuf);
	}
 
	printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
	return 0;
}
int mycdev_close(struct inode *inode,struct file *file)
{
	printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
	return 0;
}
 
struct file_operations fops = {
	.open=mycdev_open,
	.read=mycdev_read,
	.write=mycdev_write,
	.release=mycdev_close,
};
 
static int __init mycdev_init(void)
{
	major = register_chrdev(0,"mychrdev",&fops);
	if(major < 0)
	{
		printk("字符设备驱动注册失败\n");
		return major;
	}
	printk("字符设备驱动注册成功%d\n",major);
	//进行映射
	vir_rcc=ioremap(LED_RCC,4);
	if(vir_rcc==NULL)
	{
		printk("物理映射失败%d\n",__LINE__);
	}
	vir_modere=ioremap(LED_MODERE,4);
	if(vir_rcc==NULL)
	{
		printk("物理映射失败%d\n",__LINE__);
	}
	vir_moderf=ioremap(LED_MODERF,4);
	if(vir_rcc==NULL)
	{
		printk("物理映射失败%d\n",__LINE__);
	}
	vir_odre=ioremap(LED_ODRE,4);
	if(vir_rcc==NULL)
	{
		printk("物理映射失败%d\n",__LINE__);
	}
	vir_odrf=ioremap(LED_ODRF,4);
	if(vir_rcc==NULL)
	{
		printk("物理映射失败%d\n",__LINE__);
	}
 
 
	//rcc使能
	(*vir_rcc) |= (0x1<<4);
	(*vir_rcc) |= (0x1<<5);
	// moder设置输出模式
	//led1，PE10
	(*vir_modere) &= (~(0x3<<20));
	(*vir_modere) |= (0x1<<20);
	//led2，PF10
	(*vir_moderf) &= (~(0x3<<20));
	(*vir_moderf) |= (0x1<<20);
	//led3，PE8
	(*vir_modere) &= (~(0x3<<16));
	(*vir_modere) |= (0x1<<16);
	//设置默认为关灯
	(*vir_odre) &= (~(0x1<<10));
	(*vir_odrf) &= (~(0x1<<10));
	(*vir_odre) &= (~(0x1<<8));
	return 0;
 
}
static void __exit mycdev_exit(void)
{ 
	unregister_chrdev(major,"mychrdev");
	iounmap(vir_rcc);
	iounmap(vir_modere);
	iounmap(vir_moderf);
	iounmap(vir_odre);
	iounmap(vir_odrf);
}
 
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");