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+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+.\"
+.\" Copyright (c) 2020 Andriy Gapon <avg@FreeBSD.org>
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd August 12, 2020
+.Dt CP2112 4
+.Os
+.Sh NAME
+.Nm cp2112
+.Nd driver for a USB GPIO and I2C peripheral device
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following lines in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device cp2112"
+.Cd "device usb"
+.Cd "device gpio"
+.Cd "device iicbus"
+.Ed
+.Pp
+Alternatively, to load the driver as a
+module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+cp2112_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for Silicon Labs CP2112 device.
+The device has 8 general purpose I/O pins and an I2C controller that supports
+a subset of the I2C protocol.
+.Pp
+All pins support both input and output modes.
+An output pin can be configured either for open-drain or push-pull operation.
+Pins 0, 1 and 7 support special functions: I2C transmit indication,
+I2C receive indication and clock output respectively.
+At the moment the
+.Nm
+driver does not provide a way to enable and configure the special functions.
+.Pp
+The I2C controller supports read transactions with up to 512 bytes of data,
+write transactions with up to 61 bytes of data and a write followed by
+the repeated start followed by a read transactions where the write can be
+up to 16 bytes and the read can be up to 512 bytes.
+Zero length transfers are not supported.
+The
+.Nm
+driver creates a
+.Xr gpio 4
+and
+.Xr iicbus 4
+child buses to expose the respective functions.
+.Sh SEE ALSO
+.Xr gpio 4 ,
+.Xr iicbus 4 ,
+.Xr usb 4
+.Sh HISTORY
+The
+.Nm
+driver and this manual page was written by
+.An Andriy Gapon Aq Mt avg@FreeBSD.org .

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