lvgl-demo: add support to initialize LVGL demo at boot

This commit adds a systemd service and a sysvinit script to initialize the LVGL
demo automatically on boot.

Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>

meta-digi-dey/recipes-graphics/lvgl/files/lvgl-demo-init

@@ -0,0 +1,133 @@
+#!/bin/sh
+#===============================================================================
+#
+#  Copyright (C) 2024 by Digi International Inc.
+#  All rights reserved.
+#
+#  This program is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU General Public License version 2 as published by
+#  the Free Software Foundation.
+#
+#
+#  !Description: Initialize LVGL demo
+#
+#===============================================================================
+
+readonly DEMO_NAME="lvgl_demo"
+readonly DEMO_PATH="/usr/bin/${DEMO_NAME}"
+readonly DEMO_TITLE="LVGL Demo Application"
+readonly DEMO_DISPLAY="##DEMO_DISPLAY##"
+readonly DEMO_ENV="##DEMO_ENV##"
+readonly PID_FILE="/run/${DEMO_NAME}.pid"
+
+log() {
+	if type "systemd-cat" >/dev/null 2>/dev/null; then
+		systemd-cat -p "${1}" -t "${DEMO_NAME}" printf "%s" "${2}"
+	fi
+	logger -p "${1}" -t "${DEMO_NAME}" "${2}"
+}
+
+get_demo_pid() {
+	local pid="$(pgrep -f ${DEMO_PATH})"
+
+	[ -n "${pid}" ] && { echo "${pid}"; return 0; }
+
+	return 1
+}
+
+check_is_running() {
+	local pid
+
+	if [ -s "${PID_FILE}" ]; then
+		pid="$(cat ${PID_FILE})"
+	else
+		pid="$(get_demo_pid)"
+		echo "${pid}" > ${PID_FILE}
+	fi
+
+	if [ "${pid}" ]; then
+		kill -0 "${pid}" >/dev/null 2>&1 && return 0
+	fi
+
+	rm -f "${PID_FILE}"
+
+	return 1
+}
+
+wait_for_wayland() {
+	local count=20
+	local wayland_socket="/run/user/0/${DEMO_DISPLAY}"
+
+	while [ ! -S "${wayland_socket}" ]; do
+		sleep 1
+		count=$((count-1))
+		if [ "${count}" = 0 ]; then
+			return 1
+		fi
+	done
+	sleep 1
+	return 0
+}
+
+stop() {
+	check_is_running || return
+
+	local pid="$(cat ${PID_FILE})"
+	kill -TERM "${pid}" >/dev/null 2>&1
+
+	local STOP_TIMEOUT="5"
+	for i in $(seq ${STOP_TIMEOUT}); do
+		check_is_running || { log info "stopped"; break; }
+		if [ "${i}" -eq ${STOP_TIMEOUT} ]; then
+			log warning "stop: ${DEMO_NAME} did not stop gracefully"
+			kill -KILL "${pid}" >/dev/null 2>&1
+		fi
+		sleep 1
+	done
+}
+
+start() {
+	check_is_running && { log warning "start: ${DEMO_NAME} ALREADY running"; exit 0; }
+
+	if [ -d "/usr/share/wayland" ]; then
+		wait_for_wayland
+	else
+		# Disable the cursor when displaying at full screen on fbdev
+		echo "0" > /sys/class/graphics/fbcon/cursor_blink
+	fi
+
+	# Launch demo
+	env ${DEMO_ENV} ${DEMO_PATH} >/dev/null 2>&1 &
+
+	if [ $? -eq 0 ]; then
+		echo $! > ${PID_FILE}
+		log info "$(cat ${PID_FILE})"
+		log info "started"
+	fi
+}
+
+case "$1" in
+	start)
+		echo -n "Starting ${DEMO_TITLE}: "
+		start
+		echo "done."
+		;;
+	stop)
+		stop
+		echo -n "Stopping ${DEMO_TITLE}: "
+		if [ -n "`/bin/pidof ${DEMO_PATH}`" ] ; then
+			echo "FAIL"
+		else
+			echo "OK"
+		fi
+		;;
+	restart)
+		stop
+		sleep 1
+		start
+		;;
+	*)
+		echo "Usage: $0 {start|stop|restart}"
+		exit 1
+		;;
+esac

meta-digi-dey/recipes-graphics/lvgl/files/lvgl-demo-init.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=LVGL Demo Application
+
+# Make sure we are started after graphic service is available
+After=##WESTON_SERVICE##
+Requires=##WESTON_SERVICE##
+
+[Service]
+Type=forking
+PIDFile=/run/lvgl_demo.pid
+ExecStart=/etc/lvgl-demo-init start
+ExecStop=/etc/lvgl-demo-init stop
+
+[Install]
+WantedBy=multi-user.target

meta-digi-dey/recipes-graphics/lvgl/lvgl-demo_8.3.0.bb

@@ -9,6 +9,8 @@ SRCBRANCH ?= "dey/master"
 
 SRC_URI = " \
     gitsm://github.com/digi-embedded/lv_port_linux_frame_buffer.git;branch=${SRCBRANCH};protocol=https \
+    file://lvgl-demo-init \
+    file://lvgl-demo-init.service \
 "
 SRCREV = "0a799d22a5aaf9de18aca428579945a0a9c2c270"
 
@@ -23,7 +25,7 @@ PACKAGECONFIG = "${@bb.utils.contains('DISTRO_FEATURES', 'wayland', 'wayland', '
 
 require lv-drivers.inc
 
-inherit cmake
+inherit cmake systemd update-rc.d
 
 S = "${WORKDIR}/git"
 
@@ -58,9 +60,47 @@ do_configure:prepend() {
 	    -i "${S}/lv_drv_conf.h"
 }
 
+WESTON_SERVICE ?= "weston.service"
+WESTON_SERVICE:ccmp15 ?= "weston-launch.service"
+DEMO_DISPLAY ?= "wayland-0"
+DEMO_DISPLAY:ccmp15 ?= "wayland-1"
+DEMO_ENV ?= "DISPLAY=:0.0 XDG_RUNTIME_DIR=/run/user/0 WAYLAND_DISPLAY=\${DEMO_DISPLAY}"
+DEMO_ENV:ccimx6ul ?= ""
+
 do_install:append() {
 	install -d ${D}${bindir}
 	install -m 0755 ${B}/lvgl_fb ${D}${bindir}/lvgl_demo
+
+	# Install systemd service
+	if ${@bb.utils.contains('DISTRO_FEATURES', 'systemd', 'true', 'false', d)}; then
+		# Install systemd unit files
+		install -d ${D}${systemd_unitdir}/system
+		install -m 0644 ${WORKDIR}/lvgl-demo-init.service ${D}${systemd_unitdir}/system/
+		sed -i -e "s,##WESTON_SERVICE##,${WESTON_SERVICE},g" \
+			"${D}${systemd_unitdir}/system/lvgl-demo-init.service"
+	fi
+
+	# Install wrapper bootscript to launch LVGL demo on boot
+	install -d ${D}${sysconfdir}/init.d
+	install -m 0755 ${WORKDIR}/lvgl-demo-init ${D}${sysconfdir}/lvgl-demo-init
+	sed -i -e "s@##DEMO_DISPLAY##@${DEMO_DISPLAY}@g" \
+		   -e "s@##DEMO_ENV##@${DEMO_ENV}@g" \
+		   "${D}${sysconfdir}/lvgl-demo-init"
+	ln -sf ${sysconfdir}/lvgl-demo-init ${D}${sysconfdir}/init.d/lvgl-demo-init
 }
 
+PACKAGES =+ "${PN}-init"
+FILES:${PN}-init = " \
+    ${sysconfdir}/lvgl-demo-init \
+    ${sysconfdir}/init.d/lvgl-demo-init \
+    ${systemd_unitdir}/system/lvgl-demo-init.service \
+"
+
+INITSCRIPT_PACKAGES += "${PN}-init"
+INITSCRIPT_NAME:${PN}-init = "lvgl-demo-init"
+INITSCRIPT_PARAMS:${PN}-init = "start 99 3 5 . stop 20 0 1 2 6 ."
+
+SYSTEMD_PACKAGES = "${PN}-init"
+SYSTEMD_SERVICE:${PN}-init = "lvgl-demo-init.service"
+
 COMPATIBLE_MACHINE = "(ccimx6$|ccimx6ul|ccimx8m|ccimx8x|ccimx93|ccmp15)"

meta-digi-dey/recipes-graphics/packagegroups/packagegroup-dey-lvgl.bb

@@ -8,4 +8,5 @@ inherit packagegroup
 
 RDEPENDS:${PN} += " \
     lvgl-demo \
+    lvgl-demo-init \
 "