xiaomi-elish: Generate bluetooth mac address from machine-id

Since v6.9 default mac bluetooth address of QCA6390
"00:00:00:00:5a:ad" is no longer usable. So we have to generate
a new one.

config/boards/xiaomi-elish.conf

@@ -37,6 +37,10 @@ function post_family_tweaks_bsp__xiaomi-elish_firmware() {
 	install -Dm655 $SRC/packages/bsp/usb-gadget-network/remove-usbgadget-network.sh $destination/usr/local/bin/
 	install -Dm644 $SRC/packages/bsp/usb-gadget-network/usbgadget-rndis.service $destination/usr/lib/systemd/system/
 
+	# Bluetooth MAC addr setup service
+	install -Dm655 $SRC/packages/bsp/generate-bt-mac-addr/bt-fixed-mac.sh $destination/usr/local/bin/
+	install -Dm644 $SRC/packages/bsp/generate-bt-mac-addr/bt-fixed-mac.service $destination/usr/lib/systemd/system/
+
 	# Kernel postinst script to update abl boot partition
 	install -Dm655 $SRC/packages/bsp/xiaomi-elish/zz-update-abl-kernel $destination/etc/kernel/postinst.d/
 
@@ -71,6 +75,7 @@ function post_family_tweaks__xiaomi-elish_enable_services() {
 	chroot_sdcard systemctl enable usbgadget-rndis.service
 	chroot_sdcard systemctl enable pd-mapper.service
 	chroot_sdcard systemctl enable tqftpserv.service
+	chroot_sdcard systemctl enable bt-fixed-mac.service
 	return 0
 }
 

packages/bsp/generate-bt-mac-addr/bt-fixed-mac.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=Bluetooth Fixed Mac Address
+After=bluetooth.service systemd-machine-id-commit.service
+Wants=bluetooth.service
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+SyslogIdentifier=bt-fixed-mac
+ExecStart=/usr/local/bin/bt-fixed-mac.sh
+[Install]
+WantedBy=bluetooth.target

packages/bsp/generate-bt-mac-addr/bt-fixed-mac.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+mac="$(echo $(cat /etc/machine-id; echo bluetooth)| sha256sum -)"
+bt_mac=$(echo "42:${mac:0:2}:${mac:4:2}:${mac:8:2}:${mac:12:2}:${mac:16:2}")
+echo $bt_mac
+/usr/bin/bluetoothctl mgmt.public-addr $bt_mac