驱动中的ioctl方法和open、close、read、write方法一样，都是可以操作底层硬件的，对硬件的读写操作一般可以通过read、write方法来完成。-Driving the ioctl methods and the open, close, read, write, method, can be operation of the underlying hardware, the hardware of the general method can read, write, read