#!/bin/bash
# Copyright 2013
# Charles Steinkuehler <charles@steinkuehler.net>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

dtbo_err () {
	echo "Error loading device tree overlay file: $DTBO" >&2
	exit 1
}

pin_err () {
	echo "Error exporting pin:$PIN" >&2
	exit 1
}

dir_err () {
	echo "Error setting direction:$DIR on pin:$PIN" >&2
	exit 1
}

SLOTS=/sys/devices/bone_capemgr.*/slots

# Make sure required device tree overlay(s) are loaded
for DTBO in cape-universal cape-bone-iio ; do

	if grep -q $DTBO $SLOTS ; then
		echo $DTBO overlay found
	else
		echo Loading $DTBO overlay
		sudo -A su -c "echo $DTBO > $SLOTS" || dtbo_err
		sleep 1
	fi
done;

if [ ! -r /sys/devices/ocp.*/helper.*/AIN0 ] ; then
	echo Analog input files not found in /sys/devices/ocp.*/helper.* >&2
	exit 1;
fi

if [ ! -r /sys/class/uio/uio0 ] ; then
	echo PRU control files not found in /sys/class/uio/uio0 >&2
	exit 1;
fi

