struct_usb_composite_dev

Langue: en

Autres versions - même langue

Version: October 2010 (fedora - 01/12/10)

Section: 9 (Appels noyau Linux)

Sommaire

NAME

struct_usb_composite_dev - represents one composite usb gadget

SYNOPSIS

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

MEMBERS

gadget

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

req

used for control responses; buffer is pre-allocated

bufsiz

size of buffer pre-allocated in req

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 lqregister/unregister WUSB gadgetrq calls; (b) updates to usb_gadget to include flags lqis it wirelessrq, lqis it wiredrq, 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.