#!/bin/sh

ath10kcal_die() {
	echo "ath10cal: " "$*"
	exit 1
}

ath10kcal_extract() {
	local part=$1
	local offset=$2
	local count=$3
	local mtd

	mtd=$(find_mtd_chardev $part)
	[ -n "$mtd" ] || \
		ath10kcal_die "no mtd device found for partition $part"

	dd if=$mtd of=/lib/firmware/$FIRMWARE iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
		ath10kcal_die "failed to extract calibration data from $mtd"
}

ensure_correct_art() {
	# NOTE(rytis): Hardcoded hashes for 64 KiB file, filled with zeroes (md5b0) and ones (md5b1).
	local md5b0="fcd6bcb56c1689fcef28b57c22475bad"
	local md5b1="ecb99e6ffea7be1e5419350f725da86b"
	local artdir="/dev/mtd12"
	local bindir="/usr/share/art/art_rutx.bin"
	local md5art="$(md5sum $artdir)"
	md5art="${md5art%% *}"
	local devicename="$(mnf_info -n)"
	devicename="${devicename:0:6}"

	if [ "$devicename" != "RUTX08" ] && [ "$devicename" != "RUTX09" ]; then
		if [ "$md5art" == "$md5b0" ] || [ "$md5art" == "$md5b1" ] && [ -e "$bindir" ]; then
			mtd write $bindir $artdir
		fi
	else
		if [ "$md5art" != "$md5b0" ] && [ "$md5art" != "$md5b1" ]; then
			mtd erase $artdir
		fi
	fi
}

[ -e /lib/firmware/$FIRMWARE ] && exit 0

. /lib/functions.sh
. /lib/functions/system.sh

board=$(board_name)

ensure_correct_art

case "$FIRMWARE" in
"ath10k/pre-cal-ahb-a000000.wifi.bin")
	case "$board" in
	teltonika,rutx)
		ath10kcal_extract "0:ART" 4096 12064
		;;
	esac
	;;
"ath10k/pre-cal-ahb-a800000.wifi.bin")
	case "$board" in
	teltonika,rutx)
		ath10kcal_extract "0:ART" 20480 12064
		;;
	esac
	;;
*)
	exit 1
	;;
esac