mtd-utils: add a UBI health monitor service

The ubihealthd daemon, present in mtd-utils does random
scans of the UBI devices on a given interval. This helps
to deal with 'read disturb' problem on NAND flashes.

The service runs a ubihealthd thread for every UBI device
with a read interval of 1 hour by default.

Signed-off-by: Hector Palacios <hector.palacios@digi.com>

https://onedigi.atlassian.net/browse/DEL-9571

meta-digi-dey/recipes-devtools/mtd/mtd-utils/ubihealthd-init

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+DAEMON="/usr/sbin/ubihealthd"
+CMD="$1"
+INTERVAL="${2:-3600}"  # Optional (default to 1 hour if not specified)
+
+[ -z "$CMD" ] && usage
+
+usage() {
+	echo "Usage: $0 {start|stop|restart} [interval_sec]"
+	exit 1
+}
+
+case "$CMD" in
+	start)
+		for dev in $(ls /sys/class/ubi/ | grep -E '^ubi[0-9]+$'); do
+			PIDFILE="/run/ubihealthd-${dev}.pid"
+			echo -n "Starting UBI health monitor on ${dev} (interval ${INTERVAL} s): "
+			start-stop-daemon -S -b -x "${DAEMON}" -m -p "${PIDFILE}" -- -d /dev/"${dev}" -i "${INTERVAL}" -f
+			echo "done."
+		done
+		;;
+	stop)
+		for dev in $(ls /sys/class/ubi/ | grep -E '^ubi[0-9]+$'); do
+			PIDFILE="/run/ubihealthd-${dev}.pid"
+			start-stop-daemon -K -x "${DAEMON}" -p "${PIDFILE}"
+			rm -f "$PIDFILE"
+		done
+		;;
+	restart)
+		$0 stop
+		sleep 1
+		$0 start
+		;;
+	*)
+		usage
+		;;
+esac

meta-digi-dey/recipes-devtools/mtd/mtd-utils/ubihealthd.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=UBI health monitor
+After=ubi.mount
+ConditionDirectoryNotEmpty=/sys/class/ubi
+
+[Service]
+Type=oneshot
+ExecStart=/etc/ubihealthd-init start
+ExecStop=/etc/ubihealthd-init stop
+RemainAfterExit=true
+
+[Install]
+WantedBy=multi-user.target

meta-digi-dey/recipes-devtools/mtd/mtd-utils_git.bbappend

@@ -1,3 +1,33 @@
-# Copyright (C) 2023, Digi International Inc.
+# Copyright (C) 2023-2025, Digi International Inc.
 
 PACKAGECONFIG:append = " crypto"
+FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
+
+SRC_URI += " \
+    file://ubihealthd-init \
+    file://ubihealthd.service \
+"
+
+inherit systemd update-rc.d
+
+do_install:append:class-target() {
+	install -d ${D}${sysconfdir}/init.d/
+	install -m 0755 ${WORKDIR}/ubihealthd-init ${D}${sysconfdir}/
+	ln -sf ${sysconfdir}/ubihealthd-init ${D}${sysconfdir}/init.d/ubihealthd-init
+
+	install -d ${D}${systemd_unitdir}/system/
+	install -m 0644 ${WORKDIR}/ubihealthd.service ${D}${systemd_unitdir}/system/
+}
+
+FILES:mtd-utils-ubifs += " \
+    ${sysconfdir}/ubihealthd-init \
+    ${sysconfdir}/init.d/ubihealthd-init \
+    ${systemd_unitdir}/system/ubihealthd.service \
+"
+
+INITSCRIPT_PACKAGES += "mtd-utils-ubifs"
+INITSCRIPT_NAME:mtd-utils-ubifs = "ubihealthd-init"
+INITSCRIPT_PARAMS:mtd-utils-ubifs = "start 19 2 3 4 5 . stop 21 0 1 6 ."
+
+SYSTEMD_PACKAGES = "mtd-utils-ubifs"
+SYSTEMD_SERVICE:mtd-utils-ubifs = "ubihealthd.service"