驱动程序：

/****************************************************************************************
*Name: keyboard.c
*Author: Ma Dongpeng
*Time: 2011-02-17 14:08:10
*Version: 1.0.0
*Description: keyborad driver for linux2.6.25
*****************************************************************************************/

#include
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#include

#define DEVICE_NAME "keyboard" // 加载模式后，执行”cat /proc/devices”命令看到的设备名称
#define KEYBOARD_MAJOR 252 // 主设备号
#define KEY_NUM 4 //按键数目
#define KEYSTATUS_DOWNX 0
#define KEYSTATUS_UP 1
#define KEY_TIMER_DELAY 15 //以ms为单位，表示延时15ms
#define KEY_TIMER_DELAY1 100
#define KEY_TIMER_DELAY2 20

static int keyboard_major=KEYBOARD_MAJOR;

struct key_irq_desc
{
int irq; //中断号
int pin; //中断引脚
int pin_setting; //设置gpio功能
int number;
char *name;
};

// 用来指定按键所用的外部中断引脚及中断触发方式, 名字
static struct key_irq_desc key_irqs [] =
{
{IRQ_EINT1, S3C2410_GPF1, S3C2410_GPF1_EINT1, 0, "KEY1"}, /* K1 */
{IRQ_EINT4, S3C2410_GPF4, S3C2410_GPF4_EINT4, 1, "KEY2"}, /* K2 */
{IRQ_EINT2, S3C2410_GPF2, S3C2410_GPF2_EINT2, 2, "KEY3"}, /* K3 */
{IRQ_EINT0, S3C2410_GPF0, S3C2410_GPF0_EINT0, 3, "KEY4"}, /* K4 */
};

struct key_dev
{
struct cdev cdev;
char key_values[KEY_NUM]; //记录键值为1表示对应的按键被按下
unsigned int key_status[KEY_NUM]; //记录按键状态
wait_queue_head_t key_waitq; //等待队列
int key_values_flag; //记录是否有任何一个按键被按下
};
struct key_dev *key_devp;

static struct timer_list key_timer[KEY_NUM]; //按键的定时器

static char __initdata info[] = "******************keyborad Driver*****************\n";
static struct class *key_class;

/******************************************************************************************
*键盘中断处理程序
*******************************************************************************************/
static irqreturn_t key_interrupt(int irq, void *dev_id)
{
struct key_irq_desc *key_irqs = (struct key_irq_desc *)dev_id;
disable_irq(key_irqs->irq); //关中断进入查询模式

key_devp->key_status[key_irqs->number]=KEYSTATUS_DOWNX;
key_timer[key_irqs->number].expires=jiffies+KEY_TIMER_DELAY;
add_timer(&key_timer[key_irqs->number]); //启动定时器

return IRQ_RETVAL(IRQ_HANDLED);
}

/******************************************************************************************
*处理键盘事件，在key_timer_handler中被调用,记录键值唤醒等待队列
*******************************************************************************************/
static void key_event(int num)
{
//printk(KERN_ALERT "num=%d\n",num);
key_devp->key_values[num]=1;
key_devp->key_values_flag=1;
wake_up_interruptible(&key_devp->key_waitq); //唤醒等待队列
}