#!/bin/bash

#/*

# * Copyright (C) 2013-2016 Intel Corporation

# *

# * This program is free software; you can redistribute it and/or modify

# * it under the terms of the GNU General Public License as published by

# * the Free Software Foundation; either version 2 of the License, or

# * (at your option) any later version.

# *

# * This program is distributed in the hope that it will be useful,

# * but WITHOUT ANY WARRANTY; without even the implied warranty of

# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# * GNU General Public License for more details.

# *

# */

#set -x

subdevice_number=0

get_subdevice=0

#make sure the HDMI monitor is connected and active ########

# To get HDMI audio device number

card_number=$(aplay -l | grep "HDMI 0" | cut -b 6)

if [ "$card_number" = "" ]; then

	echo "Can not get Display audio card."

	#failed to get Display audio card.

	exit 1

fi

audio_card_dir="/proc/asound/card$card_number/"

cd $audio_card_dir

for file in `ls`

	do

		#To get the ELD information according to the connented monitor with HDMI

		if [[ $file == eld* ]]; then

			let subdevice_number+=1

			cat $file | grep connection_type | grep HDMI > /dev/null

			if [ $? = 0 ]; then

				get_subdevice=1

				break

			fi

		fi

	done

#failed to get the subdevice number of HDMI audio.

if [ $get_subdevice == 0 ]; then

	exit 77

fi

#the subdevice number of HDMI audio is 3.

if [ $subdevice_number == 1 ]; then

	exit 3

#the subdevice number of HDMI audio is 7.

elif [ $subdevice_number == 2 ]; then

	exit 7

#the subdevice number of HDMI audio is 8.

elif [ $subdevice_number == 3 ]; then

	exit 8

#default: failed to get the subdevice number of HDMI audio.

else

	exit 77

fi