#!/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 DP monitor is connected and active

# To get DisplayPort audio device number

card_number=$(aplay -l | grep "HDMI 1" | cut -b 6)

echo $card_number

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

	echo "Can not get Display audio card."

	exit 254

fi

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

cd $audio_card_dir

for file in `ls`

do

	#To get the ELD info according to the connented monitor with DisplayPort.

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

		let subdevice_number+=1

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

		if [ $? = 0 ]; then

			echo "Get the ELD information according to the connented \

monitor with DisplayPort."

			get_subdevice=1

			break

		fi

	fi

done

#failed to get the subdevice number of DisplayPort audio

if [ $get_subdevice == 0 ]; then

        exit 77

fi

#the subdevice number of DisplayPort audio is 3

if [ $subdevice_number == 1 ]; then

	exit 3

#the subdevice number of DisplayPort audio is 7.

elif [ $subdevice_number == 2 ]; then

	exit 7

#the subdevice number of DisplayPort audio is 8

elif [ $subdevice_number == 3 ]; then

	exit 8

#default: failed to get the subdevice number of DisplayPort audio

else

	exit 77

fi