12.1.4 按键设备驱动中断、定时器处理程序

1 static void s3c2410_eint_key(int irq, void *dev_id, struct pt_regs *reg)
2 {
3   int key = dev_id;
4   disable_irq(key_info_tab[key].irq_no); //关中断，转入查询模式
5 
6   keydev.keyStatus[key] = KEYSTATUS_DOWNX;//状态为按下
7   key_timer[key].expires == jiffies + KEY_TIMER_DELAY1;//延迟
8   add_timer(&key_timer[key]); //启动定时器
9 }

1  static void key_timer_handler(unsigned long data)
2  {
3    int key = data;
4    if (ISKEY_DOWN(key))
5    {
6      if (keydev.keyStatus[key] == KEYSTATUS_DOWNX)
7      //从中断进入
8      {
9        keydev.keyStatus[key] = KEYSTATUS_DOWN;
10       key_timer[key].expires == jiffies + KEY_TIMER_DELAY; //延迟
11       keyEvent();   //记录键值，唤醒等待队列
12       add_timer(&key_timer[key]);
13     }
14     else
15     {
16       key_timer[key].expires == jiffies + KEY_TIMER_DELAY; //延迟
17       add_timer(&key_timer[key]);
18     }
19   }
20   else       //键已抬起
21   {
22     keydev.keyStatus[key] = KEYSTATUS_UP;
23     enable_irq(key_info_tab[key].irq_no);
24   }
25 }