1#!/bin/bash 2 3#/* 4# * Copyright (C) 2013-2016 Intel Corporation 5# * 6# * This program is free software; you can redistribute it and/or modify 7# * it under the terms of the GNU General Public License as published by 8# * the Free Software Foundation; either version 2 of the License, or 9# * (at your option) any later version. 10# * 11# * This program is distributed in the hope that it will be useful, 12# * but WITHOUT ANY WARRANTY; without even the implied warranty of 13# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14# * GNU General Public License for more details. 15# * 16# */ 17#set -x 18 19subdevice_number=0 20get_subdevice=0 21 22#make sure the HDMI monitor is connected and active ######## 23 24# To get HDMI audio device number 25card_number=$(aplay -l | grep "HDMI 0" | cut -b 6) 26if [ "$card_number" = "" ]; then 27 echo "Can not get Display audio card." 28 #failed to get Display audio card. 29 exit 1 30fi 31 32audio_card_dir="/proc/asound/card$card_number/" 33 34cd $audio_card_dir 35for file in `ls` 36 do 37 #To get the ELD information according to the connented monitor with HDMI 38 if [[ $file == eld* ]]; then 39 let subdevice_number+=1 40 cat $file | grep connection_type | grep HDMI > /dev/null 41 if [ $? = 0 ]; then 42 get_subdevice=1 43 break 44 fi 45 fi 46 done 47 48#failed to get the subdevice number of HDMI audio. 49if [ $get_subdevice == 0 ]; then 50 exit 77 51fi 52 53#the subdevice number of HDMI audio is 3. 54if [ $subdevice_number == 1 ]; then 55 exit 3 56#the subdevice number of HDMI audio is 7. 57elif [ $subdevice_number == 2 ]; then 58 exit 7 59#the subdevice number of HDMI audio is 8. 60elif [ $subdevice_number == 3 ]; then 61 exit 8 62#default: failed to get the subdevice number of HDMI audio. 63else 64 exit 77 65fi 66