linux内核下点亮led(未使用中断版本)

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;