舉例說明:
jiffies : 全域性變數, 表示系統時鐘滴答, 增加1 表示 系統時鐘+1; 時間上乙個系統滴答 10ms
struct pin_desc * temp_pin_des =null;
static declare_mutex(sem_button_lock); //定義互斥鎖
static struct class *six_drvdrv_class;
static struct class_device *six_drvdrv_class_dev;
volatile unsigned long *gpfcon;
volatile unsigned long *gpfdat;
volatile unsigned long *gpgcon;
volatile unsigned long *gpgdat;
static struct timer_list button_timer; //定義乙個定時器
static declare_wait_queue_head(button_waitq);
/* 中斷事件標誌, 中斷服務程式將它置1，six_drv_drv_read將它清0 */
static volatile int ev_press = 0;
static struct fasync_struct *button_async;
struct pin_desc;
/* 鍵值: 按下時, 0x01, 0x02, 0x03, 0x04 */
/* 鍵值: 鬆開時, 0x81, 0x82, 0x83, 0x84 */
static unsigned char key_val;
struct pin_desc pins_desc[4] = ,
, ,,};
/* * 確定按鍵值
*/static irqreturn_t buttons_irq(int irq, void *dev_id)
static void buttons_timeout(unsigned long data)
else
ev_press = 1; /* 表示中斷發生了 */
wake_up_interruptible(&button_waitq); /* 喚醒休眠的程序 */
/* 非同步通知 */
kill_fasync (&button_async, sigio, poll_in);
}static int six_drv_drv_open(struct inode *inode, struct file *file)
else
//阻塞
/* 註冊中斷 */
request_irq(irq_eint0, buttons_irq, irqt_bothedge, "s2", &pins_desc[0]);
request_irq(irq_eint2, buttons_irq, irqt_bothedge, "s3", &pins_desc[1]);
request_irq(irq_eint11, buttons_irq, irqt_bothedge, "s4", &pins_desc[2]);
request_irq(irq_eint19, buttons_irq, irqt_bothedge, "s5", &pins_desc[3]);
return 0;
}ssize_t six_drv_drv_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
}else
/* 如果有按鍵動作, 返回鍵值 */
copy_to_user(buf, &key_val, 1);
ev_press = 0;
return 1;
}int six_drv_drv_close(struct inode *inode, struct file *file)
static unsigned six_drv_drv_poll(struct file *file, poll_table *wait)
static int six_drv_drv_fasync (int fd, struct file *filp, int on)
static struct file_operations sencod_drv_fops = ;
int major;
static int six_drv_drv_init(void)
static void six_drv_drv_exit(void)
module_init(six_drv_drv_init);
module_exit(six_drv_drv_exit);
module_license("gpl");
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