#!/bin/sh -Cefu


#
# Copyright (c) 2025  Sulev-Madis Silber <ketas@si.pri.ee>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#


set -Cefu


rtprio 0 "-$$" || :


_ppid()
{
	ps -ax -o ppid,pid | awk -v "v=$$" '$2==v{print$1}'
}


case "`sysctl -ni hw.fdt.compatible`"
in
	*allwinner*h3*)
		cd /root/tmp || exit 1
		
		
		rtprio 0 "-`_ppid`"
		;;
	*)
		cd /root/files/ws2812 || exit 1
		;;
esac


perl_script=./spi.pl

shell_script=tmp/spi.sh

custom_spi_binary=./spi


if [ "${1:-}" -a "${2:-}" -a "${3:-}" -a "${4:-}" ]
then
	device="$2"
	
	speed="$3"
	
	buffer="$4"
else
	device=spigen0.0
	
	speed=3000000
	
	buffer="`\"$perl_script\" bin | wc -c`"
fi


case "${1:-}"
in
	*local-sh*)
		"$perl_script" loop | while read line
		do
			echo -n "$line" | spi -f "$device" -A -d w -m 0 \
			-s "$speed" -c "$buffer"
		done
		;;
	*local-direct*)
		pkill -9 spi || :
		
		"$perl_script" loop,bin | "$custom_spi_binary" -f "$device" \
		-S -d w -m 0 -s "$speed" -c "$buffer"
		;;
	*remote-sh*)
		while read line
		do
			echo -n "$line" | spi -f "$device" -A -d w -m 0 \
			-s "$speed" -c "$buffer"
		done
		;;
	*remote-direct-text*)
		pkill -9 spi || :
		
		exec "$custom_spi_binary" -f "$device" -A -S -d w -m 0 \
		-s "$speed" -c "$buffer"
		;;
	*remote-direct-bin*)
		pkill -9 spi || :
		
		exec "$custom_spi_binary" -f "$device" -S -d w -m 0 \
		-s "$speed" -c "$buffer"
		;;
	*remote-perl*)
		exec "$perl_script" wrap "$device" "$speed" "$buffer"
		;;
	*run*)
		host="`cat .host`"
		
		ssh "$host" sysctl dev.aw_thermal.0.cpu
		
		ssh "$host" pkill -9 spi || :
		
		set +f
		
		scp -pr /home/ketas/files/ws2812/* "$host:tmp"
		
		cp -av /home/ketas/files/ws2812/* ~/files/ws2812
		
		set -f
		
		cp -av /home/ketas/files/ws2812/.host ~/files/ws2812
		
		chown -vvR 0:0 /root/files/ws2812
		
		./spi.sh
		;;
	*)
		host="`cat .host`"
		
		"$perl_script" loop,bin | ssh "$host" exec "$shell_script" \
		remote-direct-bin "$device" "$speed" "$buffer"
		;;
esac