android kernel linux系统的USB键盘驱动源码，是用USB HID协议。-android kernel linux system, the USB keyboard driver source code, with USB HID protocol.

主要是通过USB host 与HID设备进行通讯：枚举设备->找到设备的接口->连接设备->分配相应的端点->在IN端点进行读操作，在OUT端点进行写操作。详细可查看-Mainly through the USB host to communicate with HID devices: enumerate devices-> find the device interface-> Connect device-> Assign appropriate