#!/bin/sh -l
#===============================================================================
#
#  10-atheros_pre-up
#
#  Copyright (C) 2012 by Digi International Inc.
#  All rights reserved.
#
#  This program is free software; you can redistribute it and/or modify it
#  under the terms of the GNU General Public License version 2 as published by
#  the Free Software Foundation.
#
#
#  !Description: Load Atheros' wireless driver
#
#===============================================================================

set -e

[ "${IFACE}" != "wlan0" ] && exit 0

FIRMWARE_DIR="/lib/firmware/ath6k/AR6003/hw2.1.1"
RAM_DRIVE="/var/run"
MAC_FILENAME="softmac"

#
# Get the wlan MAC address from NVRAM.  Use a default
# value if the address has not been set.
#

# TODO: Hardcoded until passed to kernel command line from U-Boot.
#MAC_ADDR="$(nvram print module ethaddr2 | sed 's,ethaddr2=,,g')"
#if [ -z "${MAC_ADDR}" -o "${MAC_ADDR}" = "00:00:00:00:00:00" ]; then
	MAC_ADDR="00:04:F3:4C:B1:D3"
#fi

mac1="$(echo ${MAC_ADDR} | cut -d':' -f1)"
mac2="$(echo ${MAC_ADDR} | cut -d':' -f2)"
mac3="$(echo ${MAC_ADDR} | cut -d':' -f3)"
mac4="$(echo ${MAC_ADDR} | cut -d':' -f4)"
mac5="$(echo ${MAC_ADDR} | cut -d':' -f5)"
mac6="$(echo ${MAC_ADDR} | cut -d':' -f6)"

printf "\x${mac1}\x${mac2}\x${mac3}\x${mac4}\x${mac5}\x${mac6}" > ${RAM_DRIVE}/${MAC_FILENAME}

# We need to write the WLAN MAC address to softmac in the ath6k firmware
# directory.  However, we don't want to rewrite the file if it already exists
# and the address is the same because we don't want to wear out NAND flash.
#
# So create the file on the RAM DRIVE first and compare the two.  Only update
# the copy on NAND if the address has changed.
#
if ! cmp -s ${RAM_DRIVE}/${MAC_FILENAME} ${FIRMWARE_DIR}/${MAC_FILENAME}; then
	cp ${RAM_DRIVE}/${MAC_FILENAME} ${FIRMWARE_DIR}/${MAC_FILENAME}
fi
rm -f ${RAM_DRIVE}/${MAC_FILENAME}

# Figure out which wireless region we are in.  The US has rules for
# what channels can be used and at what power level.  We use a different set of
# rules for the other regions in the world that we sell into.  The mod_cert field
# in OTP will be set to 0x0 for the US.  Once we know the region, make sure the
# appropriate calibration file is loaded.
#
US_CODE="0x0"
REGION_CODE="$(cat /sys/kernel/ccardxmx28/mod_cert)"
if [ -z "${REGION_CODE}" -o "${US_CODE}" = "${REGION_CODE}" ]; then
	BDATA_SOURCE=Digi_6203-6233-US.bin
else
	BDATA_SOURCE=Digi_6203-6233-World.bin
fi

# We don't want to rewrite NAND every time we boot so only
# change the link if it is wrong.
BDATA_LINK="${FIRMWARE_DIR}/bdata.bin"
if [ ! -e "${BDATA_LINK}" ] || ! cmp -s "${BDATA_LINK}" "${FIRMWARE_DIR}/${BDATA_SOURCE}"; then
	ln -sf "${BDATA_SOURCE}" "${BDATA_LINK}"
fi

# ath6kl_sdio.ko
ATH6KL_PARAMS=""
[ -f "/root/wifi_test_mode" ] && { ATH6KL_PARAMS="${ATH6KL_PARAMS} testmode=1"; test_mode_str=" in test mode"; }
grep -qs ath6kl_sdio /proc/modules || \
	/sbin/modprobe -q ath6kl_sdio ${ATH6KL_PARAMS} || echo "Loading ath6kl_sdio module${test_mode_str}: [FAILED]"

# Delay required for the interface 'wlan0' to settle down before trying to configure it.
sleep 0.5