#!/bin/bash
# ========================================================================== #
#                                                                            #
#    KVMD - The main PiKVM daemon.                                           #
#                                                                            #
#    Copyright (C) 2018-2023  Maxim Devaev <mdevaev@gmail.com>               #
#                                                                            #
#    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 3 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.                            #
#                                                                            #
#    You should have received a copy of the GNU General Public License       #
#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
#                                                                            #
# ========================================================================== #


set -eE
set -x

# https://forums.raspberrypi.com/viewtopic.php?p=2202017

card="$1"
conn_id="$2"

test -n "$card"
test -n "$conn_id"

card_n="${card/card/}"
test -n "$card_n"

port=$(grep "^connector\[$conn_id\]:" "/sys/kernel/debug/dri/$card_n/state" | awk '{print $2}')
test -n "$port"


if [ "$port" = "HDMI-A-1" ]; then
	if systemctl is-enabled -q kvmd-pass; then
		status=$(head -n 1 "/sys/class/drm/$card-$port/status")
		if [ "$status" = "connected" ]; then
			systemctl restart kvmd-pass || true
		fi
	fi
fi