treewide: move calibration data extraction function to library

This moves the almost identical calibration data extraction
functions present multiple times in several targets to a single
library file /lib/functions/caldata.sh.

Functions are renamed with more generic names to merge different
variants that only differ in their names.

Most of the targets used find_mtd_chardev, while some used
find_mtd_part inside the extraction code. To merge them, the more
abundant version with find_mtd_chardev is used in the common code.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
[rebase on latest master; add mpc85xx]
Signed-off-by: David Bauer <mail@david-bauer.net>

1 files changed, 75 insertions, 0 deletions

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 0000000000..f2a306675f
--- /dev/null
+++ b/package/base-files/files/lib/functions/caldata.sh
@@ -0,0 +1,75 @@
+# Copyright (C) 2019 OpenWrt.org
+
+. /lib/functions.sh
+. /lib/functions/system.sh
+
+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 $part"
+
+	dd if=$mtd of=/lib/firmware/$FIRMWARE iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
+		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 $part"
+
+	dd if=/dev/$ubi of=/lib/firmware/$FIRMWARE iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
+		caldata_die "failed to extract calibration data from $ubi"
+}
+
+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 "%02x "' $mtd)
+
+	for byte in $reversed; do
+		caldata="\x${byte}${caldata}"
+	done
+
+	printf "%b" "$caldata" > /lib/firmware/$FIRMWARE
+}
+
+caldata_from_file() {
+	local source=$1
+	local offset=$(($2))
+	local count=$(($3))
+
+	dd if=$source of=/lib/firmware/$FIRMWARE iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
+		caldata_die "failed to extract calibration data from $source"
+}
+
+caldata_valid() {
+	local expected="$1"
+
+	magic=$(hexdump -v -n 2 -e '1/1 "%02x"' /lib/firmware/$FIRMWARE)
+	[[ "$magic" == "$expected" ]]
+	return $?
+}
+