#!/bin/bash

# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (C) 2020-present Shanti Gilbert (https://github.com/shantigilbert)
# Copyright (C) 2023 JELOS (https://github.com/JustEnoughLinuxOS)

. /etc/profile

if [[ ${AUDIO_MANAGEMENT} == "UCM" ]]; then
    /usr/bin/volume restore
    exit 0
fi

# Sync with the REAL jack state at startup. The kernel keeps the switch
# state in the input device (EV_SW/SW_HEADPHONE_INSERT), so query it via
# evtest --query (exit 10 = bit set) instead of trusting a saved setting
# or the legacy /sys/class/gpio number, which mainline kernels don't
# even expose. On these boards the switch is inverted: value 0 means
# headphones inserted (see HP_ON below), so bit set = speakers.
# Fallback order: input switch, legacy gpio node when it exists, speakers.
JACK_STATE="speakers"
if [ -n "${DEVICE_HEADPHONE_DEV}" ] && [ -e "${DEVICE_HEADPHONE_DEV}" ]; then
  evtest --query "${DEVICE_HEADPHONE_DEV}" EV_SW SW_HEADPHONE_INSERT
  [ $? -eq 0 ] && JACK_STATE="headphone"
elif [ -n "${DEVICE_JACK}" ] && [ -e "/sys/class/gpio/gpio${DEVICE_JACK}/value" ]; then
  [ "$(cat /sys/class/gpio/gpio${DEVICE_JACK}/value)" = "0" ] && JACK_STATE="headphone"
fi
set_setting "audio.device" "${JACK_STATE}"

### Set the default audio path, needed for some devices
if [ -z "${DEVICE_PLAYBACK_PATH}" ]
then
  DEVICE_PLAYBACK_PATH="Playback Path"
fi

# An explicit request wins; "auto" (or nothing) follows the jack state
# detected above, so a reboot with headphones plugged starts on HP.
case "${2:-${JACK_STATE}}" in
    "headphone")
        amixer -c 0 -M cset "name=${DEVICE_PLAYBACK_PATH}" "${DEVICE_PLAYBACK_PATH_HP}"
    ;;
    "auto"|"speakers"|*)
        amixer -c 0 -M cset "name=${DEVICE_PLAYBACK_PATH}" "${DEVICE_PLAYBACK_PATH_SPK}"
    ;;
esac

/usr/bin/volume $(get_setting "audio.volume")

# Headphone sensing
DEVICE="${DEVICE_HEADPHONE_DEV}"

# No jack input device on this board: nothing to watch, the initial
# path set above is all there is (evtest on an empty path would just
# die and burn a service restart cycle).
if [ -z "${DEVICE}" ] || [ ! -e "${DEVICE}" ]; then
    exit 0
fi

HP_ON='*(SW_HEADPHONE_INSERT), value 0*'
HP_OFF='*(SW_HEADPHONE_INSERT), value 1*'

evtest "${DEVICE}" | while read line; do
    case $line in
	(${HP_ON})
	amixer -c 0 cset "name=${DEVICE_PLAYBACK_PATH}" "${DEVICE_PLAYBACK_PATH_HP}"
	set_setting "audio.device" "headphone"
	;;
	(${HP_OFF})
	amixer -c 0 cset "name=${DEVICE_PLAYBACK_PATH}" "${DEVICE_PLAYBACK_PATH_SPK}"
	set_setting "audio.device" "speakers"
	;;
    esac
done