头文件：
#ifndef _LED_CONFIG_H
#define _LED_CONFIG_H
#define LED_CON 0
#define LED_ON 1
#define LED_OFF 2
#endif
内核下面的驱动模块：
#include <linux/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/cdev.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include "../led_config.h"
#include <linux/errno.h>
#define PHYS_BASE 0x56000040
#define SIZE 12
#define setbit(data,pos,len,val) do{\
data &=~((~(~0<<len))<<pos);\
data |=val<<pos;\
}while(0)
struct led_driver{
unsigned long gpecon;
unsigned long gpedat;
unsigned long gpeup;
unsigned long virt_base;
struct cdev led_dev;
unsigned long major;
unsigned long minor;
dev_t devno;
void (*conf)(struct led_driver *);
void (*on)(struct led_driver *);
void (*off)(struct led_driver *);
};
struct led_driver *md;
void con_led(struct led_driver *led)
{
unsigned long tmp;
