[OpenWrt-Devel] [PATCH 4/5] ath79: add ath9k calibration data MAC addresses patching
Christian Lamparter
chunkeey at gmail.com
Fri Aug 10 17:24:48 EDT 2018
This patch copies over the MAC patching helper functions from lantiq's
target/linux/lantiq/base-files/etc/hotplug.d/firmware/12-ath9k-eeprom
file.
Not all vendors bothered to write the correct MAC addresses for the
ath9k wifi into the calibration data. And while ath9k does have some
special dt-properties to extract the addresses from a fixed position,
there are still devices that require userspace to edit or modify
the caldata.
In my case, the MAC address for the Wi-Fi device is stored in an
unsorted key-value based "nvram" database and there's an existing
userspace tool to extract the data.
Signed-off-by: Christian Lamparter <chunkeey at gmail.com>
---
.../etc/hotplug.d/firmware/10-ath9k-eeprom | 50 +++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom b/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
index e8adcf613a..08151388cc 100644
--- a/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
+++ b/target/linux/ath79/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
@@ -42,6 +42,56 @@ ath9k_eeprom_extract_reverse() {
printf "%b" "$caldata" > /lib/firmware/$FIRMWARE
}
+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"
+}
+
+ath9k_patch_fw_mac() {
+ local mac=$1
+ local mac_offset=$2
+ local chksum_offset=$3
+ local xor_mac
+ local xor_fw_mac
+ local xor_fw_chksum
+
+ [ -z "$mac" -o -z "$mac_offset" ] && return
+
+ [ -n "$chksum_offset" ] && {
+ xor_mac=${mac//:/}
+ xor_mac="${xor_mac:0:4} ${xor_mac:4:4} ${xor_mac:8:4}"
+
+ xor_fw_mac=$(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} ${xor_fw_mac:8:4}"
+
+ xor_fw_chksum=$(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
+ }
+
+ macaddr_2bin $mac | dd of=/lib/firmware/$FIRMWARE conv=notrunc bs=1 seek=$mac_offset count=6
+}
+
+ath9k_patch_fw_mac_crc() {
+ local mac=$1
+ local mac_offset=$2
+ local chksum_offset=$((mac_offset - 10))
+
+ ath9k_patch_fw_mac "${mac}" "${mac_offset}" "${chksum_offset}"
+}
+
board=$(board_name)
case "$FIRMWARE" in
--
2.18.0
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