在linux下用三种不同的方式注册一个字符设备，侧地搞清楚字符设备的注册方式。本源代码是以按键驱动完整程序为例写的，里面还包含了测试程序，所有内容全部测试通过-Under the linux in three different ways to register a character device, character device side to clear the registration of way. Is a key driver source code example to wri