说明：  这个一个与具体设备无关的特殊设备的驱动程序，实际中，还可以涉及到很多内容，如ioctl、I/O端口等，此方面，我进在研究学习中！
(This has nothing to do with a special device-specific device driver, in practice, but also involves a lot of content, such as the ioctl, I/O ports and so on, this connection, I entered in the study of learning!)