centos man page for struct_usb_composite_dev

STRUCT 
USB_COMPOSITE(9) 				      Kernel Mode Gadget API					   STRUCT USB_COMPOSITE(9)

NAME
       struct_usb_composite_dev - represents one composite usb gadget

SYNOPSIS
       struct usb_composite_dev {
	 struct usb_gadget * gadget;
	 struct usb_request * req;
	 struct usb_configuration * config;
       };

MEMBERS
       gadget
	   read-only, abstracts the gadget's usb peripheral controller

       req
	   used for control responses; buffer is pre-allocated

       config
	   the currently active configuration

DESCRIPTION
       One of these devices is allocated and initialized before the associated device driver's bind is called.

OPEN ISSUE
       it appears that some WUSB devices will need to be built by combining a normal (wired) gadget with a wireless one. This revision of the
       gadget framework should probably try to make sure doing that won't hurt too much.

ONE NOTION FOR HOW TO HANDLE WIRELESS USB DEVICES INVOLVES
       (a) a second gadget here, discovery mechanism TBD, but likely needing separate "register/unregister WUSB gadget" calls; (b) updates to
       usb_gadget to include flags "is it wireless", "is it wired", plus (presumably in a wrapper structure) bandgroup and PHY info; (c)
       presumably a wireless_ep wrapping a usb_ep, and reporting wireless-specific parameters like maxburst and maxsequence; (d) configurations
       that are specific to wireless links; (e) function drivers that understand wireless configs and will support wireless for (additional)
       function instances; (f) a function to support association setup (like CBAF), not necessarily requiring a wireless adapter; (g) composite
       device setup that can create one or more wireless configs, including appropriate association setup support; (h) more, TBD.

AUTHOR
       David Brownell <dbrownell@users.sourceforge.net>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   STRUCT USB_COMPOSITE(9)