basic manpage for pcfadc sensor (Philips PCF8591 A/D)

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+.\"	$OpenBSD: pcfadc.4,v 1.1 2006/02/10 23:06:05 djm Exp $
+.\"
+.\" Copyright (c) 2006 Damien Miller <djm@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 February 11, 2006
+.Dt PCFADC 4
+.Os
+.Sh NAME
+.Nm pcfadc
+.Nd Philips PCF8591 I2C Analogue to Digital Converter
+.Sh SYNOPSIS
+.Cd "pcfadc* at iic?"
+.Sh DESCRIPTION
+The
+.Nm
+driver supports the PCF8591 I2C Analogue to Digital Converter, making 
+its readings available through a
+.Xr sysctl 8
+interface.
+.Pp
+The driver reads up to four A/D lines configured as temperature inputs.
+Sensor names, type and calibration information are read from OpenFirmware.
+.Sh SEE ALSO
+.Xr iic 4 ,
+.Xr intro 4 ,
+.Xr sensorsd 8 ,
+.Xr sysctl 8
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Damien Miller Aq djm@openbsd.org .