通过简单实例，从Linux设备驱动本身，理解Linux内核模块、Linux设备驱动的结构、Linux设备驱动中的并发控制等内容。并针对设备驱动的实例，给出了用户态的程序来访问该设备，展现设备驱动的运行情况及用户态和内核态的交互。-Linux (which is a kernel) manages the machine s hardware in a simple and efficient manner, offering the user a simple and uniform programming interface. In the same way, the kernel, and in particular its device drivers, form a bridge or interface between the end-user/programmer and the hardware. Any subroutines or functions forming part of the kernel (modules and device drivers, for example) are considered to be part of kernel space.