Introduction - If you have any usage issues, please Google them yourself
LINUX device drivers third edition of the supporting source Device Driver is the most popular explanation is " driven by the actions of hardware. The drive deal directly with the underlying hardware, the read and write devices work in accordance with the specific hardware register, complete the device polling, interrupt handling, DMA communication, physical memory to virtual memory mapping, and ultimately allow communication device can send and receive data , so that the display device can display text and pictures, log file and data storage equipment.