#!/bin/bash
#
# Copyright 2017 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

set -o errexit

if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root (use sudo)" 1>&2
   exit 1
fi

set -e

sed -i \
  -e "s/^dtparam=audio=on/#\0/" \
  -e "s/^#\(dtparam=i2s=on\)/\1/" \
  /boot/config.txt
grep -q "dtoverlay=i2s-mmap" /boot/config.txt || \
  echo "dtoverlay=i2s-mmap" >> /boot/config.txt
grep -q "dtoverlay=googlevoicehat-soundcard" /boot/config.txt || \
  echo "dtoverlay=googlevoicehat-soundcard" >> /boot/config.txt
grep -q "dtparam=i2s=on" /boot/config.txt || \
  echo "dtparam=i2s=on" >> /boot/config.txt
