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+.\" $NetBSD: gpio.conf.5,v 1.3 2022/04/30 13:48:09 brad Exp $
+.\"
+.\" Copyright (c) 2009 Marc Balmer <marc@msys.ch>
+.\" All rights reserved.
+.\"
+.\" 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 ``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 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.
+.\"
+.Dd August 1, 2009
+.Dt GPIO.CONF 5
+.Os
+.Sh NAME
+.Nm gpio.conf
+.Nd GPIO config file
+.Sh DESCRIPTION
+The
+.Nm
+file is read by the
+.Pa gpio
+rc.d script during system start-up and shutdown,
+and is intended for configuring GPIO pins.
+.Ss FILE FORMAT
+Lines starting with a hash
+.Pq Sq #
+and empty lines are ignored.
+If a line starts with
+.Sq \&! ,
+the rest of line will get evaluated as shell script fragment.
+All other lines are passed to
+.Xr gpioctl 8 .
+.Sh FILES
+.Bl -tag -width XXetcXgpioXconfXX
+.It Pa /etc/gpio.conf
+The
+.Nm
+configuration file resides in
+.Pa /etc .
+.It Pa /etc/rc.d/gpio
+.Xr rc.d 8
+script that parses
+.Nm .
+.El
+.Sh EXAMPLES
+In this example, if the
+.Pa /etc/gpio.conf
+config file is present pin 1 of
+.Pa /dev/gpio0
+is set as output and named "error_led".
+.Bd -literal -offset indent
+# Program pin 1 of /dev/gpio0 as output and name it "error_led"
+gpio0 1 set out error_led
+.Ed
+.Sh SEE ALSO
+.Xr gpioctl 8 ,
+.Xr rc 8