ath79: add ath9k calibration data MAC addresses patching

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@gmail.com>

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 5d52af71fbc7e88a3a040f0c132c291927d68ff5..cd8f19be39253c1a968fb6cf2b22a943afacaa7e 100644 (file)
--- 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