USB Gadget
服务器托管网A USB Linux Gadget is a device which has a UDC (USB Device Controller) and can
be connected to a USB Host to extend it with additional functions 服务器托管网like a serial
A gadget is seen by its host as a set of configurations, each of which contains
a number of interfaces which, from the gadget’s perspective, are known as
functions, each function representing e.g. a serial connection or a SCSI disk.
Linux provides a number of functions for gadgets to use.
USB Linux Gadget是USB设备控制器作为从设备，连接到USB Host，通过 USB 来模拟其它类型的设备，比如UAC、UVC、HID设备、串口等等
CDC类
USB的CDC类是USB通信设备类 (Communication Device Class)的简称。CDC类是USB组织定义的一类专门给各种通信设备(电信通信设备和中速网络通信设备)使用的USB子类
CDC，USB Driver支持以下子类: ECM、NCM、ACM、OBEX、设备管理。
Configfs
Documentation/filesystems/configfs.rst
configfs is a ram-based filesystem that provides the converse of
sysfs’s functionality. Where sysfs is a filesystem-based view of
kernel objects, configfs is a filesystem-based manager of kernel
objects, or config_items.
Userspace-driven Kernel Object Configuration
configfs是一个基于ram的文件系统，通过对该文件系统的操作实现对内核对象的配置
Documentation/filesystems/configfs.rst
不只是USB可以通过configfs进行配置，有些子系统也可以。理论上只要实现了configfs接口的应该都行
driver/usb/gadget/configfs.c:
通过configfs_register_subsystem(&gadget_subsys);，在configfs中注册了usb gadget子系统
使用configfs配置usb gadget
作者: Shell
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论基于 DSSA 的软件架构设计与应用 软件服务器托管网架构设计的一个重要课题是如何解决软件重用问题。特定领域软件架构（Domain Specific Software Architecture，DSSA）是一种有效实现特定领域软件重服务器托管网用的手段。按照…
