/
rpi-psu_client.sh
executable file
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/
rpi-psu_client.sh
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#!/bin/sh
#
###############################################################################
# Copyright 2012-2013 Guillermo A. Amaral B. 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 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.
#
## INSTALL ####################################################################
#
# Simply run as this script as a daemon on system start.
#
# Here's an example of how you could do just that on target.
#
# su # become root
# cp rpi-psu_client.sh /usr/local/bin
# chmod 700 /usr/local/bin/rpi-psu_client.sh
# echo "null::once:/root/rpi-psu_client.sh" >> /etc/inittab
#
## UBUNTU USERS ###############################################################
#
# Since ubuntu points /bin/sh to Dash, you will need to replace the top line
# from #!/bin/sh to #!/bin/bash or trap won't work.
#
###############################################################################
cleanup()
{
echo "1" > /sys/class/gpio/gpio${RPI_READY}/value
echo ${RPI_READY} > /sys/class/gpio/unexport
echo ${RPI_SHUTDOWN} > /sys/class/gpio/unexport
}
# Pin defs
RPI_SHUTDOWN=23
RPI_READY=24
# RPI Shutdown Pin
echo ${RPI_SHUTDOWN} > /sys/class/gpio/export
echo "in" > /sys/class/gpio/gpio${RPI_SHUTDOWN}/direction
# RPI Ready Pin
echo ${RPI_READY} > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio${RPI_READY}/direction
echo "0" > /sys/class/gpio/gpio${RPI_READY}/value
# Traps
trap 'cleanup; exit' SIGHUP SIGINT SIGTERM SIGQUIT
# Wait for shutdown signal
while [ `cat /sys/class/gpio/gpio${RPI_SHUTDOWN}/value` -lt 1 ]; do
sleep 1
done
# Clean up
cleanup
# Shutdown RPI
shutdown -Ph now || poweroff