distribution/packages/sysutils/system-utils/sources/devices/RK3399/hdmi_sense

#!/bin/bash

# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (C) 2023-present BrooksyTech (https://github.com/brooksytech)

. /etc/profile

# Set export GPIO for HDMI
if [ ! -d "/sys/class/gpio/gpio${DEVICE_HDMI_GPIO}" ]; then
  echo ${DEVICE_HDMI_GPIO} > /sys/class/gpio/export
  echo in > /sys/class/gpio/gpio${DEVICE_HDMI_GPIO}/direction
fi

# Pull GPIO for Speaker / Headphone plugged
if [ -d "/sys/class/gpio/gpio${DEVICE_JACK}" ]; then
  HP_GPIO=$(cat /sys/class/gpio/gpio${DEVICE_JACK}/value)
fi

# Check HDMI plugged / unplugged, set audio output, restart Emulation Station
HDMI_VALUE=$(cat /sys/class/gpio/gpio${DEVICE_HDMI_GPIO}/value)
while true
do
    HDMI_NEW_VALUE=$(cat /sys/class/gpio/gpio${DEVICE_HDMI_GPIO}/value)

    if test "${HDMI_VALUE}" != "${HDMI_NEW_VALUE}"
    then
      case ${HDMI_NEW_VALUE} in
        "0") #HDMI plugged
          sed -i 's/pcm "hw:0,0"/pcm "hw:1,0"/' /storage/.config/asound.conf
        ;;
        "1") #HDMI unpluagged
          sed -i 's/pcm "hw:1,0"/pcm "hw:0,0"/' /storage/.config/asound.conf
            case ${HP_GPIO} in
              "1")
                amixer cset name='Speaker Switch' ${DEVICE_PLAYBACK_PATH_HP}
                amixer set 'Headphone' '67%'
                amixer set 'Playback Polarity' Normal
                set_setting "audio.device" "headphone"
              ;;
              *)
                amixer cset name='Speaker Switch' ${DEVICE_PLAYBACK_PATH_SPK}
                amixer set 'Headphone' '100%'
                amixer set 'Playback Polarity' 'R Invert'
                set_setting "audio.device" "speakers"
              ;;
            esac
        ;;
      esac
      systemctl restart weston

      HDMI_VALUE=${HDMI_NEW_VALUE}
    fi
    sleep 5
done