#!/bin/sh
brightness_file="$(find /sys/devices/platform/msm_ssbi.0/ -name brightness | grep -v rgb | head -n1)"
test -z "$brightness_file" && {
        echo "Can't find screen brightness file!"
        exit 1
}
echo "Screen brightness : $brightness_file"
test -w "$brightness_file" || {
        echo "Can't find write screen brightness file!"
        exit 1
}
while true ; do
        test "$(cat "$brightness_file")" -ne 255 && \
                echo 255 > "$brightness_file"
        sleep 1
done