diff --git a/package/base-files/files/lib/functions/caldata.sh b/package/base-files/files/lib/functions/caldata.sh
new file mode 100644
index 0000000..f0fc907
--- /dev/null
+++ b/package/base-files/files/lib/functions/caldata.sh
@@ -0,0 +1,218 @@
+# Copyright (C) 2019 OpenWrt.org
+
+. /lib/functions.sh
+. /lib/functions/system.sh
+
+caldata_dd() {
+	local source=$1
+	local target=$2
+	local count=$(($3))
+	local offset=$(($4))
+
+	dd if=$source of=$target iflag=skip_bytes,fullblock bs=$count skip=$offset count=1 2>/dev/null
+	return $?
+}
+
+caldata_die() {
+	echo "caldata: " "$*"
+	exit 1
+}
+
+caldata_extract() {
+	local part=$1
+	local offset=$(($2))
+	local count=$(($3))
+	local mtd
+
+	mtd=$(find_mtd_chardev $part)
+	[ -n "$mtd" ] || caldata_die "no mtd device found for partition $part"
+
+	caldata_dd $mtd /lib/firmware/$FIRMWARE $count $offset || \
+		caldata_die "failed to extract calibration data from $mtd"
+}
+
+caldata_extract_ubi() {
+	local part=$1
+	local offset=$(($2))
+	local count=$(($3))
+	local ubidev
+	local ubi
+
+	. /lib/upgrade/nand.sh
+
+	ubidev=$(nand_find_ubi $CI_UBIPART)
+	ubi=$(nand_find_volume $ubidev $part)
+	[ -n "$ubi" ] || caldata_die "no UBI volume found for $part"
+
+	caldata_dd /dev/$ubi /lib/firmware/$FIRMWARE $count $offset || \
+		caldata_die "failed to extract calibration data from $ubi"
+}
+
+caldata_extract_mmc() {
+	local part=$1
+	local offset=$(($2))
+	local count=$(($3))
+	local mmc_part
+
+	mmc_part=$(find_mmc_part $part)
+	[ -n "$mmc_part" ] || caldata_die "no mmc partition found for partition $part"
+
+	caldata_dd $mmc_part /lib/firmware/$FIRMWARE $count $offset || \
+		caldata_die "failed to extract calibration data from $mmc_part"
+}
+
+caldata_extract_reverse() {
+	local part=$1
+	local offset=$2
+	local count=$(($3))
+	local mtd
+	local reversed
+	local caldata
+
+	mtd=$(find_mtd_chardev "$part")
+	reversed=$(hexdump -v -s $offset -n $count -e '1/1 "%02x "' $mtd)
+
+	for byte in $reversed; do
+		caldata="\x${byte}${caldata}"
+	done
+
+	printf "%b" "$caldata" > /lib/firmware/$FIRMWARE
+}
+
+caldata_from_file() {
+	local source=$1
+	local offset=$(($2))
+	local count=$(($3))
+	local target=$4
+
+	[ -n "$target" ] || target=/lib/firmware/$FIRMWARE
+
+	caldata_dd $source $target $count $offset || \
+		caldata_die "failed to extract calibration data from $source"
+}
+
+caldata_sysfsload_from_file() {
+	local source=$1
+	local offset=$(($2))
+	local count=$(($3))
+	local target_dir="/sys/$DEVPATH"
+	local target="$target_dir/data"
+
+	[ -d "$target_dir" ] || \
+		caldata_die "no sysfs dir to write: $target"
+
+	echo 1 > "$target_dir/loading"
+	caldata_dd $source $target $count $offset
+	if [ $? != 0 ]; then
+		echo 1 > "$target_dir/loading"
+		caldata_die "failed to extract calibration data from $source"
+	else
+		echo 0 > "$target_dir/loading"
+	fi
+}
+
+caldata_valid() {
+	local expected="$1"
+	local target=$2
+
+	[ -n "$target" ] || target=/lib/firmware/$FIRMWARE
+
+	magic=$(hexdump -v -n 2 -e '1/1 "%02x"' $target)
+	[ "$magic" = "$expected" ]
+	return $?
+}
+
+caldata_patch_data() {
+	local data=$1
+	local data_count=$((${#1} / 2))
+	[ -n "$2" ] && local data_offset=$(($2))
+	[ -n "$3" ] && local chksum_offset=$(($3))
+	local target=$4
+	local fw_data
+	local fw_chksum
+
+	[ -z "$data" -o -z "$data_offset" ] && return
+
+	[ -n "$target" ] || target=/lib/firmware/$FIRMWARE
+
+	fw_data=$(hexdump -v -n $data_count -s $data_offset -e '1/1 "%02x"' $target)
+
+	if [ "$data" != "$fw_data" ]; then
+
+		if [ -n "$chksum_offset" ]; then
+			fw_chksum=$(hexdump -v -n 2 -s $chksum_offset -e '1/1 "%02x"' $target)
+			fw_chksum=$(xor $fw_chksum $(data_2xor_val $fw_data) $(data_2xor_val $data))
+
+			data_2bin $fw_chksum | \
+				dd of=$target conv=notrunc bs=1 seek=$chksum_offset count=2 || \
+				caldata_die "failed to write chksum to eeprom file"
+		fi
+
+		data_2bin $data | \
+			dd of=$target conv=notrunc bs=1 seek=$data_offset count=$data_count || \
+			caldata_die "failed to write data to eeprom file"
+	fi
+}
+
+ath9k_patch_mac() {
+	local mac=$1
+	local target=$2
+
+	caldata_patch_data "${mac//:/}" 0x2 "" "$target"
+}
+
+ath9k_patch_mac_crc() {
+	local mac=$1
+	local mac_offset=$2
+	local chksum_offset=$((mac_offset - 10))
+	local target=$4
+
+	caldata_patch_data "${mac//:/}" "$mac_offset" "$chksum_offset" "$target"
+}
+
+ath10k_patch_mac() {
+	local mac=$1
+	local target=$2
+
+	caldata_patch_data "${mac//:/}" 0x6 0x2 "$target"
+}
+
+ath11k_patch_mac() {
+	local mac=$1
+	# mac_id from 0 to 5
+	local mac_id=$2
+	local target=$3
+
+	[ -z "$mac_id" ] && return
+
+	caldata_patch_data "${mac//:/}" $(printf "0x%x" $(($mac_id * 0x6 + 0xe))) 0xa "$target"
+}
+
+ath10k_remove_regdomain() {
+	local target=$1
+
+	caldata_patch_data "0000" 0xc 0x2 "$target"
+}
+
+ath11k_remove_regdomain() {
+	local target=$1
+	local regdomain
+	local regdomain_data
+
+	regdomain=$(hexdump -v -n 2 -s 0x34 -e '1/1 "%02x"' $target)
+	caldata_patch_data "0000" 0x34 0xa "$target"
+	
+	for offset in 0x450 0x458 0x500 0x5a8; do
+		regdomain_data=$(hexdump -v -n 2 -s $offset -e '1/1 "%02x"' $target)
+
+		if [ "$regdomain" == "$regdomain_data" ]; then
+			caldata_patch_data "0000" $offset 0xa "$target"
+		fi
+	done
+}
+
+ath11k_set_macflag() {
+	local target=$1
+
+	caldata_patch_data "0100" 0x3e 0xa "$target"
+}