overlay.sh

#!/bin/bash

# Taken from http://elinux.org/R-Car/DT-Overlays
# Probable Author: Geert Uytterhoeven

set -e

OVERLAYS=/sys/kernel/config/device-tree/overlays
FIRMWARE=/lib/firmware

function add()
{
        if [ -e $OVERLAYS/$1 ]; then
                echo Overlay $1 already exists
                exit -1
        fi

        mkdir $OVERLAYS/$1
        echo $(basename $FIRMWARE/*$1*) > $OVERLAYS/$i/path
}

function remove()
{
        rmdir $OVERLAYS/$1
}

cmd=add

for i in $*; do
        case $i in
        add)
                cmd=add
                ;;

        rm)
                cmd=remove
                ;;

        *)
                $cmd $i
                ;;
        esac
done