From b55f64207ab4370943a8e78583ea5bff10a1740c Mon Sep 17 00:00:00 2001
From: Gonzalo Ruiz <Gonzalo.Ruiz@digi.com>
Date: Mon, 30 Jun 2025 11:32:54 +0200
Subject: [PATCH] kernel-module-nxp-wlan: add watch-regdomain service

Add service to automatically detect changes in the global regulatory
domain and force a PHY regulatory domain change.

This allows detecting regulatory domain changes based on beacon
information when 802.11d is enabled and instructing the wireless
driver to download the rgpower firmware file corresponding to the
selected country.

If the selected country is not one of the supported ones, Worldwide
rgpower_WW.bin file will be downloaded by default.

Run the check service every 5 seconds through a systemd timer.

https://onedigi.atlassian.net/browse/DEL-8974

Signed-off-by: Gonzalo Ruiz <Gonzalo.Ruiz@digi.com>
---
 .../watch-regdomain.service                       |  7 +++++++
 .../kernel-module-nxp-wlan/watch-regdomain.timer  | 11 +++++++++++
 .../kernel-module-nxp-wlan/watch_regdomain.sh     | 14 ++++++++++++++
 .../kernel-module-nxp-wlan_git.bbappend           | 15 +++++++++++++++
 4 files changed, 47 insertions(+)
 create mode 100644 meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan/watch-regdomain.service
 create mode 100644 meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan/watch-regdomain.timer
 create mode 100755 meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan/watch_regdomain.sh

diff --git a/meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan/watch-regdomain.service b/meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan/watch-regdomain.service
new file mode 100644
index 000000000..91916656c
--- /dev/null
+++ b/meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan/watch-regdomain.service
@@ -0,0 +1,7 @@
+[Unit]
+Description=Monitor for global regulatory domain changes
+After=network.target
+
+[Service]
+Type=oneshot
+ExecStart=/usr/sbin/watch_regdomain.sh
diff --git a/meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan/watch-regdomain.timer b/meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan/watch-regdomain.timer
new file mode 100644
index 000000000..0d67a6f3f
--- /dev/null
+++ b/meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan/watch-regdomain.timer
@@ -0,0 +1,11 @@
+[Unit]
+Description=Check regdomain every 5 seconds
+
+[Timer]
+OnBootSec=5sec
+OnUnitInactiveSec=5sec
+AccuracySec=1s
+Unit=watch-regdomain.service
+
+[Install]
+WantedBy=timers.target
diff --git a/meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan/watch_regdomain.sh b/meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan/watch_regdomain.sh
new file mode 100755
index 000000000..2724dec29
--- /dev/null
+++ b/meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan/watch_regdomain.sh
@@ -0,0 +1,14 @@
+#!/bin/sh
+
+REGDOMAIN_FILE="/var/run/regdomain"
+
+previous=$(cat "${REGDOMAIN_FILE}" 2>/dev/null)
+
+# Extract the 'global' regulatory domain
+current=$(iw reg get | grep -m1 '^country' | cut -d' ' -f2 | tr -d ':')
+
+if [ -n "${current}" ] && [ "${current}" != "${previous}" ]; then
+	echo "Global regulatory domain changed to '${current}'"
+	echo "${current}" > "${REGDOMAIN_FILE}"
+	iw reg set ${current}
+fi
diff --git a/meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan_git.bbappend b/meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan_git.bbappend
index 4c5b73ed1..c71130c87 100644
--- a/meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan_git.bbappend
+++ b/meta-digi-arm/dynamic-layers/freescale-layer/recipes-kernel/kernel-modules/kernel-module-nxp-wlan_git.bbappend
@@ -5,6 +5,9 @@ FILESEXTRAPATHS:prepend := "${THISDIR}/${BPN}:"
 SRC_URI:append = " \
     file://81-iw612-wifi.rules \
     file://load_iw612.sh \
+    file://watch_regdomain.sh \
+    file://watch-regdomain.service \
+    file://watch-regdomain.timer \
 "
 
 do_install:append () {
@@ -12,11 +15,23 @@ do_install:append () {
 	install -m 0644 ${WORKDIR}/81-iw612-wifi.rules ${D}${sysconfdir}/udev/rules.d/
 	install -d ${D}${sysconfdir}/udev/scripts
 	install -m 0777 ${WORKDIR}/load_iw612.sh ${D}${sysconfdir}/udev/scripts/
+
+	if ${@bb.utils.contains('DISTRO_FEATURES','systemd','true','false',d)}; then
+		install -d ${D}${systemd_system_unitdir}
+		install -m 0644 ${WORKDIR}/watch-regdomain.service ${D}${systemd_system_unitdir}/watch-regdomain.service
+		install -m 0644 ${WORKDIR}/watch-regdomain.timer ${D}${systemd_system_unitdir}/watch-regdomain.timer
+	fi
+
+	install -d ${D}${sbindir}
+	install -m 0755 ${WORKDIR}/watch_regdomain.sh ${D}${sbindir}/
 }
 
 FILES:${PN}:append = " \
 	${sysconfdir}/udev/rules.d \
 	${sysconfdir}/udev/scripts \
+	${sbindir}/watch_regdomain.sh \
+	${systemd_system_unitdir}/watch-regdomain.service \
+	${systemd_system_unitdir}/watch-regdomain.timer \
 "
 
 RDEPENDS:${PN}:append = " firmware-murata-nxp"