#!/bin/sh

# xor multiple hex values of the same length
xor() {
	local val
	local ret="0x$1"
	local retlen=${#1}

	shift
	while [ -n "$1" ]; do
		val="0x$1"
		ret=$((ret ^ val))
		shift
	done

	printf "%0${retlen}x" "$ret"
}

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

ath10kcal_from_file() {
	local source=$1
	local offset=$2
	local count=$3

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

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 bs=1 skip=$offset count=$count 2>/dev/null || \
		ath10kcal_die "failed to extract calibration data from $mtd"
}

ath10kcal_patch_mac_crc() {
	local mac=$1
	local mac_offset=6
	local chksum_offset=2
	local xor_mac
	local xor_fw_mac
	local xor_fw_chksum

	[ -z "$mac" ] && return

	xor_fw_mac=$(hexdump -v -n 6 -s $mac_offset -e '/1 "%02x"' /lib/firmware/$FIRMWARE)
	xor_fw_mac="${xor_fw_mac:0:4} ${xor_fw_mac:4:4} ${xor_fw_mac:8:4}"

	macaddr_2bin $mac | dd of=/lib/firmware/$FIRMWARE conv=notrunc bs=1 seek=6 count=6

	xor_mac=${mac//:/}
	xor_mac="${xor_mac:0:4} ${xor_mac:4:4} ${xor_mac:8:4}"

	xor_fw_chksum=$(hexdump -v -n 2 -s $chksum_offset -e '/1 "%02x"' /lib/firmware/$FIRMWARE)
	xor_fw_chksum=$(xor $xor_fw_chksum $xor_fw_mac $xor_mac)

	printf "%b" "\x${xor_fw_chksum:0:2}\x${xor_fw_chksum:2:2}" | \
		dd of=/lib/firmware/$FIRMWARE conv=notrunc bs=1 seek=$chksum_offset count=2
}

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

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

board=$(board_name)

case "$FIRMWARE" in
"ath10k/pre-cal-pci-0000:01:00.0.bin")
	case $board in
	buffalo,wxr-2533dhp)
		ath10kcal_extract "ART" 4096 12064
		ath10kcal_patch_mac_crc $(mtd_get_mac_binary ART 30)
		;;
	linksys,ea8500)
		ath10kcal_extract "art" 4096 12064
		ath10kcal_patch_mac_crc $(macaddr_add $(mtd_get_mac_ascii devinfo hw_mac_addr) +1)
		;;
	nec,wg2600hp)
		ath10kcal_extract "ART" 4096 12064
		ath10kcal_patch_mac_crc $(macaddr_add $(mtd_get_mac_binary PRODUCTDATA 12) +1)
		;;
	netgear,d7800 |\
	netgear,r7500v2 |\
	netgear,r7800)
		ath10kcal_extract "art" 4096 12064
		ath10kcal_patch_mac_crc $(macaddr_add $(mtd_get_mac_binary art 6) +1)
		;;
	tplink,c2600)
		ath10kcal_extract "radio" 4096 12064
		ath10kcal_patch_mac_crc $(macaddr_add $(mtd_get_mac_binary default-mac 8) -1)
		;;
	tplink,vr2600v)
		ath10kcal_extract "ART" 4096 12064
		ath10kcal_patch_mac_crc $(macaddr_add $(mtd_get_mac_binary default-mac 0) -1)
		;;
	zyxel,nbg6817)
		ath10kcal_extract "0:ART" 4096 12064
		ath10kcal_patch_mac_crc $(macaddr_add $(mtd_get_mac_ascii 0:APPSBLENV ethaddr) +1)
		;;
	esac
	;;
"ath10k/pre-cal-pci-0001:01:00.0.bin")
	case $board in
	buffalo,wxr-2533dhp)
		ath10kcal_extract "ART" 20480 12064
		ath10kcal_patch_mac_crc $(mtd_get_mac_binary ART 24)
		;;
	linksys,ea8500)
		ath10kcal_extract "art" 20480 12064
		ath10kcal_patch_mac_crc $(macaddr_add $(mtd_get_mac_ascii devinfo hw_mac_addr) +2)
		;;
	nec,wg2600hp)
		ath10kcal_extract "ART" 20480 12064
		ath10kcal_patch_mac_crc $(mtd_get_mac_binary PRODUCTDATA 12)
		;;
	netgear,d7800 |\
	netgear,r7500v2 |\
	netgear,r7800)
		ath10kcal_extract "art" 20480 12064
		ath10kcal_patch_mac_crc $(macaddr_add $(mtd_get_mac_binary art 6) +2)
		;;
	tplink,c2600)
		ath10kcal_extract "radio" 20480 12064
		ath10kcal_patch_mac_crc $(mtd_get_mac_binary default-mac 8)
		;;
	tplink,vr2600v)
		ath10kcal_extract "ART" 20480 12064
		ath10kcal_patch_mac_crc $(mtd_get_mac_binary default-mac 0)
		;;
	zyxel,nbg6817)
		ath10kcal_extract "0:ART" 20480 12064
		ath10kcal_patch_mac_crc $(mtd_get_mac_ascii 0:APPSBLENV ethaddr)
		;;
	esac
	;;
*)
	exit 1
	;;
esac