s3c2410平台下linux四键按键驱动程序

#ifndef __KERNEL__
#define __KERNEL__
#endif
#ifndef MODULE
#define MODULE
#endif
#include<linux/config.h>
#include<linux/module.h>
#include<linux/version.h>
#include<linux/init.h>
#include<linux/kernel.h>
#include<linux/errno.h>
#include<linux/sched.h>//声明中断
#include<linux/fs.h>//声明file文件
#include<asm/system.h>/*cli(),*_flages*/
#include<linux/poll.h>
#include<linux/types.h>
#include<linux/slab.h>
#include <asm/arch/S3C2410.h>
#include <asm/hardware.h>//devf
//-------------------------------
#include <asm/io.h>/* ioremap */
#include <linux/delay.h>
#include <asm/delay.h>
//--------------------------------
#include <asm-arm/arch-s3c2410/smdk.h>
#include <linux/ioport.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
//define the interrupt No.
#define interrupt_k4   IRQ_EINT0
#define interrupt_k3   IRQ_EINT2
#define interrupt_k2   IRQ_EINT11
#define interrupt_k1   IRQ_EINT19
/*
struct IRQ_STRUCT
{
unsigned int irq_no;
void (*irq_fun)();
};
static IRQ_STRUCT irq_struct[4];
*/
//定义键盘的主设备号define the major of keypad
#define KEYPAD_MAJOR 59
#ifndef MOD_INC_USE_COUNT
#define MOD_INC_USE_COUNT
#endif
#ifndef MOD_DEC_USE_COUNT
#define MOD_DEC_USE_COUNT
#endif
#define COMMAND1 1
#define KBD_GETKEY 1
static int keyvalue;
#define DEVICE_NAME "keypad"
//setup the GPIO F ports register
#define key_rGPFCON (*(volatile unsigned long *) key_r_GPFCON)
#define key_rGPFUP (*(volatile unsigned long *) key_r_GPFUP)
#define key_rGPFDAT (*(volatile unsigned long *) key_r_GPFDAT)
//setup the GPIO G ports register
#define key_rGPGCON (*(volatile unsigned long *) key_r_GPGCON)
#define key_rGPGUP (*(volatile unsigned long *) key_r_GPGUP)
#define key_rGPGDAT (*(volatile unsigned long *) key_r_GPGDAT)
unsigned long *key_r_GPFCON, *key_r_GPFDAT,