Linux USB HID Device

USB Descriptor

1. Device Descriptor
2. Configuration Descriptor
3. Interface Descriptor -> HID Descriptor -> Report and Physical Descriptor
4. Endpoint Descriptor

Report Descriptor

1. Data format

   Usage Page
   Usage
   Collection
   ...
   End Collection
   

2. Report type
   Input report: For standard defined data.
   Output report: Not suggest to use, some old OS systems do not support this report type.
   Feature report: For self-defined data.