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+.\"	$OpenBSD: gpioiic.4,v 1.1 2006/01/14 11:50:21 grange Exp $
+.\"
+.\" Copyright (c) 2006 Alexander Yurchenko <grange@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd January 14, 2006
+.Dt GPIOIIC 4
+.Os
+.Sh NAME
+.Nm gpioiic
+.Nd I2C bus bit-banging through GPIO pins
+.Sh SYNOPSIS
+.Cd "gpioiic* at gpio? offset 0 mask 0x3"
+.Cd "iic* at gpioiic?"
+.Sh DESCRIPTION
+The
+.Nm
+driver allows to bit-bang an I2C bus as a master using two GPIO pins.
+The first pin is used as a serial data (SDA) signal and the second as
+a serial clock (SCL).
+Both GPIO pins must be able to drive an output and the SDA pin must be
+also able to read an input.
+.Pp
+The pins are specified in the kernel configuration with the
+.Ar offset
+and the
+.Ar mask
+locators.
+Each bit in the
+.Ar mask
+locator defines one pin, the pin number is calculated as an addition of
+the bit position and the
+.Ar offset
+locator.
+For example,
+.Ar offset 17
+and
+.Ar mask 0x5
+defines pin numbers 17 and 19.
+.Sh SEE ALSO
+.Xr gpio 4 ,
+.Xr iic 4 ,
+.Xr intro 4 ,
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 3.9 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Alexander Yurchenko Aq grange@openbsd.org .