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#
# Copyright (C) 2019 OpenWrt.org
#
. /lib/functions.sh
iodata_mstc_prepare_fail() {
echo "failed to check and prepare the environment, rebooting..."
umount -a
reboot -f
}
# read/write 1byte in mtd device
#
# parameters:
# $1: target mtd device ("/dev/mtdblockN")
# $2: offset of target value (decimal or hex)
# $3: value to set (decimal or hex, don't set when reading)
iodata_mstc_rw_byte() {
local mtd="$1"
local offset="$2"
local setval="$3"
local _val=$(hexdump -s $offset -n 1 -e '"%d"' $mtd)
if [ -z "$setval" ]; then
echo $_val
return 0
fi
# decimal or hex -> decimal
setval=$((setval))
[ "$_val" = "$setval" ] && return 0
setval="$(printf '%02x' $setval)"
if ! (printf "\x$setval" | dd bs=1 seek=$((offset)) conv=notrunc of=$mtd 2>/dev/null); then
return 1
fi
}
# set flag in mtd device on I-O DATA devices manufactured by MSTC
# (MitraStar Technology Corp.)
#
# parameters:
# $1: parameter name
# $2: mtd name contains target flag
# $3: offset of flag
# $4: valid flag values ("n,n,...", ex:"0,1" or "1,2")
# $5: value to set to the flag
iodata_mstc_set_flag() {
local name="$1"
local mtddev="$(find_mtd_part $2)"
local offset="$3"
local valid="$4"
local setval="$5"
if [ -z "$offset" ]; then
echo "no $name flag offset provided"
iodata_mstc_prepare_fail
fi
if [ -z "$mtddev" ]; then
echo "cannot find \"$2\" mtd partition"
iodata_mstc_prepare_fail
fi
local flag=$(iodata_mstc_rw_byte "$mtddev" "$offset")
local _tmp
for i in ${valid//,/ }; do
if [ "$flag" = "$((i))" ]; then
_tmp=$flag
break
fi
done
if [ -z "$_tmp" ]; then
echo "failed to get valid $name flag, please check the value at $offset in $mtddev"
iodata_mstc_prepare_fail
fi
echo "current: $name => $flag"
if [ "$flag" != "$((setval))" ]; then
if ! iodata_mstc_rw_byte "$mtddev" "$offset" "$setval"; then
echo "failed to set \"$name\" flag"
iodata_mstc_prepare_fail
fi
echo " --> set \"$name\" flag to $setval (valid: $valid)"
fi
}
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