Introduction to Universal Serial Bus function support.

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+.\"	$OpenBSD: usbf.4,v 1.1 2006/11/26 22:49:24 uwe Exp $
+.\"
+.\" Uwe Stuehler, 2006. Public Domain.
+.\"
+.Dd August 9, 2006
+.Dt USBF 4
+.Os
+.Sh NAME
+.Nm usbf
+.Nd introduction to Universal Serial Bus function support
+.Sh SYNOPSIS
+.\" XXX SYNOPSIS should be similar to usb.4
+.Cd "usbf* at pxaudc?"
+.Sh DESCRIPTION
+.Ox
+provides machine-independent bus support and drivers for Universal Serial
+Bus
+.Pq Tn USB
+functions, making it possible in principle for machines running
+.Ox
+to act as
+.Tn USB
+device to a
+.Tn USB
+host.
+.Pp
+The
+.Ox
+.Nm
+driver has three layers: the controller, the logical device, and the
+function layer.
+The controller attaches to a physical bus.
+The logical device attaches to the controller and the function attaches
+to the logical device.
+.Pp
+Function drivers implement the characteristics of a particular
+.Tn USB
+device class that the
+.Tn USB
+host will see when the device is connected to the bus.
+.Pp
+.\" See
+.\" .Xr usbf 9
+.\" for a description of the kernel programming interfaces for
+.\" .Tn USB
+.\" function support.
+.Sh SUPPORTED FUNCTIONS
+.Ox
+includes the following machine-independent
+.Tn USB
+function drivers, sorted by device type and driver name:
+.Ss Communication devices
+.Bl -tag -width 12n -offset ind -compact
+.It Xr cdcef 4
+Communication Device Class Ethernet Emulation Model
+.Tn USB
+network adapter.
+.El
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr pxaudc 4 ,
+.Xr usbf 9
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 4.1 .
+.\" .Sh AUTHORS
+.\" .An -nosplit
+.\" The
+.\" .Nm
+.\" driver was written by
+.\" .An Uwe Stuehler Aq uwe@openbsd.org .