说明：  如何编写Linux设备驱动程序 在Linux环境下设计驱动程序，思想简洁，操作方便，功能也很强大，但是支持函数少，只能依赖kernel中的函数，有些常用的操作要自己来编写，而且调试也不方便。
(How to write Linux device driver design in the Linux environment driver, thinking of simple, easy to operate, function is also very powerful, but less support function, can only rely on the kernel of the function, the operation of some commonly used to write to their own, and debug it inconvenient.)