12.1.5 按键设备驱动的打开、释放函数

1  static int s3c2410_key_open(struct inode *inode, struct file *filp)
2  {
3    keydev.head = keydev.tail = 0; //清空按键动作缓冲区
4    keyEvent = keyEvent_raw; //函数指针指向按键处理函数keyEvent_raw
5    return 0;
6  }
7  
8  static int s3c2410_key_release(struct inode *inode, struct file *filp)
9  {
10   keyEvent = keyEvent_dummy; //函数指针指向空函数
11   return 0;
12 }