ODROID-U3 UPS2

ups2.sh

#!/bin/sh
MODEL=$(cat /proc/cpuinfo | grep ^Hardware | awk -F " " '{print $3}')
SYSFS_GPIO_DIR="/sys/class/gpio"

retval=""

gpio_export()
{
        [ -e "$SYSFS_GPIO_DIR/gpio$1" ] && return 0
        echo $1 > "$SYSFS_GPIO_DIR/export"
}

gpio_getvalue()
{
        echo in > "$SYSFS_GPIO_DIR/gpio$1/direction"
        val=`cat "$SYSFS_GPIO_DIR/gpio$1/value"`
        retval=$val
}

gpio_setvalue()
{
        echo out > "$SYSFS_GPIO_DIR/gpio$1/direction"
        echo $2 > "$SYSFS_GPIO_DIR/gpio$1/value"
}

if test $MODEL = "ODROIDC"
then
        AC_OK_GPIO=88
        BAT_OK_GPIO=116
        LATCH_GPIO=115
        gpio_export $LATCH_GPIO 
        gpio_setvalue $LATCH_GPIO 1
elif test $MODEL = "ODROID-C2"
then
        AC_OK_GPIO=247
        BAT_OK_GPIO=239
        LATCH_GPIO=225
        gpio_export $LATCH_GPIO 
        gpio_setvalue $LATCH_GPIO 1
else 
        AC_OK_GPIO=199
        BAT_OK_GPIO=200
fi

gpio_export $AC_OK_GPIO
gpio_export $BAT_OK_GPIO
gpio_getvalue $AC_OK_GPIO
if [ $retval -eq  1 ]
then
        echo "DC Input Okay"
else
        echo "Power is shutdown or AC Adaptor is disconnected"
        gpio_getvalue $BAT_OK_GPIO
        echo $retval
        if [ $retval -eq 0 ]
        then
                echo "battery is lower than 3.7V"
                /sbin/shutdown -P 1
        else
                echo "battery is good"
        fi
fi

*/2 * * * * /root/ups2.sh