$FreeBSD: src/sys/dev/usb/FILES,v 1.6 2003/04/14 14:04:07 ticso Exp $
$DragonFly: src/sys/bus/usb/FILES,v 1.4 2007/11/05 19:09:42 hasso Exp $

A small roadmap of the USB files:

FILES			this file
Makefile		to install .h files
TODO			just a list of things to do
dsbr100io.h		API for ufm.c
ehci.c			Host controller driver for EHCI
ehcireg.h		Hardware definitions for EHCI
ehcivar.h		API for ehci.c
files.usb		config include file
hid.c			subroutines to parse and access HID data
hid.h			API for hid.c
if_aue.c		USB Pegasus Ethernet driver
if_auereg.h		  and definitions for it
if_cue.c		USB CATC Ethernet driver
if_cuereg.h		  and definitions for it
if_kue.c		USB Kawasaki Ethernet driver
if_kuereg.h		  and definitions for it
if_upl.c		USB Prolofic host-to-host driver
ohci.c			Host controller driver for OHCI
ohcireg.h		Hardware definitions for OHCI
ohcivar.h		API for ohci.c
uaudio.c		USB audio class driver
uaudioreg.h		  and definitions for it
ufm.c			USB fm radio driver
[Merged] ugen.c		generic driver that can handle access to any USB device
uhci.c			Host controller driver for UHCI
uhcireg.h		Hardware definitions for UHCI
uhcivar.h		API for uhci.c
uhid.c			USB HID class driver
uhub.c			USB hub driver
ukbd.c			USB keyboard driver
ukbdmap.c		wscons key mapping for ukbd
ukbdvar.h		API for ukbd.c
ulpt.c			USB printer class driver
umass.c			USB mass storage driver
umodem.c		USB modem (CDC ACM) driver
ums.c			USB mouse driver
urio.c			USB Diamond Rio500 driver
usb.c			usb (bus) device driver
usb.h			general USB defines
usb_mem.c		memory allocation for DMAable memory
usb_mem.h		API for usb_mem.c
usb_port.h		compatibility defines for different OSs
usb_quirks.c		table of non-conforming USB devices and their problems
usb_quirks.h		API for usb_quirks.c
usb_subr.c		various subroutines used by USB code
usbcdc.h		USB CDC class definitions
usbdi.c			implementation of the USBDI API, which all drivers use
usbdi.h			API for usbdi.c
usbdi_util.c		utilities built on top of usbdi.h
usbdi_util.h		API for usbdi_util.c
usbdivar.h		internal defines and structures for usbdi.c
uscanner.c		minimal USB scanner driver
usbhid.h		USB HID class definitions