busybox: add suspend-actions script for the ccimx8x and ccimx6ul

This script behaves the same way as our custom standby script, with a few
modifications, for example:

 * instead of using initscripts to stop/start daemons, it uses systemctl calls
 * save variables that are needed when resuming in /tmp, because the script is
executed twice instead of once (when suspending and when resuming)
 * remove the locking/unlocking of the critical section and the actual state
change, since that is handled by systemd-suspend now

Also, add a different standby script for when systemd is enabled. Said script
acts as a wrapper for systemd's suspend mechanism.

https://jira.digi.com/browse/DEL-6415

Signed-off-by: Gabriel Valcazar <gabriel.valcazar@digi.com>

meta-digi-dey/recipes-core/busybox/busybox-1.29.2/ccimx6ul/standby-actions

@@ -0,0 +1,63 @@
+#!/bin/sh
+#===============================================================================
+#
+#  standby-actions
+#
+#  Copyright (C) 2019 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: manage interfaces before suspending and after resuming from
+#                suspend
+#
+#===============================================================================
+
+if [ "${1}" == "pre" ]; then
+	# Stop NetworkManager before suspend
+	systemctl stop NetworkManager
+
+	# Suspend wireless interfaces
+	if [ -d "/proc/device-tree/wireless" ]; then
+		for i in $(sed -ne 's,^\(wlan[0-9]\)=.*,\1,g;T;p' /var/run/ifstate | sort -r); do
+			ifdown "${i}" && RESUME_IFACES="${RESUME_IFACES:+${RESUME_IFACES} }${i}"
+		done
+
+		echo ${RESUME_IFACES} > /tmp/suspend_wlan_ifaces
+		grep -qs '^wlan' /proc/modules && rmmod wlan
+	fi
+
+	# Suspend bluetooth interface
+	if [ -d "/proc/device-tree/bluetooth" ]; then
+		hciconfig hci0 2>&1 | grep -qs UP && touch /tmp/up_bt_on_resume
+		systemctl stop bluetooth
+		systemctl stop bluetooth-init
+	fi
+elif [ "${1}" == "post" ]; then
+	# Resume wireless interfaces
+	if [ -d "/proc/device-tree/wireless" ]; then
+		# Trigger wireless module loading event, and wait until the interface exists
+		udevadm trigger --action=add --attr-match="modalias=sdio:c00v0271d050A"
+		timeout -t 5 sh -c "while [ ! -d /sys/class/net/wlan0 ]; do sleep .2; done" 2>/dev/null
+
+		# Bring up the interfaces that were brought down on suspend
+		for i in $(cat /tmp/suspend_wlan_ifaces | tr ' ' '\n' | sort); do
+			grep -qs "^${i}" /var/run/ifstate || ifup "${i}"
+		done
+		rm -f /tmp/suspend_wlan_ifaces
+	fi
+
+	# Resume NetworkManager after suspend
+	systemctl start NetworkManager
+
+	# Resume bluetooth interface
+	if [ -d "/proc/device-tree/bluetooth" ]; then
+		if [ -e "/tmp/up_bt_on_resume" ]; then
+			systemctl start bluetooth
+			rm -f /tmp/up_bt_on_resume
+		fi
+	fi
+fi

meta-digi-dey/recipes-core/busybox/busybox-1.29.2/ccimx8x/standby-actions

@@ -0,0 +1,63 @@
+#!/bin/sh
+#===============================================================================
+#
+#  standby-actions
+#
+#  Copyright (C) 2019 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: manage interfaces before suspending and after resuming from
+#                suspend
+#
+#===============================================================================
+
+if [ "${1}" == "pre" ]; then
+	# Stop NetworkManager before suspend
+	systemctl stop NetworkManager
+
+	# Suspend wireless interfaces
+	if [ -d "/proc/device-tree/wireless" ]; then
+		for i in $(sed -ne 's,^\(wlan[0-9]\)=.*,\1,g;T;p' /var/run/ifstate | sort -r); do
+			ifdown "${i}" && RESUME_IFACES="${RESUME_IFACES:+${RESUME_IFACES} }${i}"
+		done
+
+		echo ${RESUME_IFACES} > /tmp/suspend_wlan_ifaces
+		grep -qs '^wlan' /proc/modules && rmmod wlan
+	fi
+
+	# Suspend bluetooth interface
+	if [ -d "/proc/device-tree/bluetooth" ]; then
+		hciconfig hci0 2>&1 | grep -qs UP && touch /tmp/up_bt_on_resume
+		systemctl stop bluetooth
+		systemctl stop bluetooth-init
+	fi
+elif [ "${1}" == "post" ]; then
+	# Resume wireless interfaces
+	if [ -d "/proc/device-tree/wireless" ]; then
+		# Trigger wireless module loading event, and wait until the interface exists
+		udevadm trigger --action=add --attr-match="modalias=pci:v0000168Cd0000003Esv*sd*bc*sc*i*"
+		timeout -t 5 sh -c "while [ ! -d /sys/class/net/wlan0 ]; do sleep .2; done" 2>/dev/null
+
+		# Bring up the interfaces that were brought down on suspend
+		for i in $(cat /tmp/suspend_wlan_ifaces | tr ' ' '\n' | sort); do
+			grep -qs "^${i}" /var/run/ifstate || ifup "${i}"
+		done
+		rm -f /tmp/suspend_wlan_ifaces
+	fi
+
+	# Resume NetworkManager after suspend
+	systemctl start NetworkManager
+
+	# Resume bluetooth interface
+	if [ -d "/proc/device-tree/bluetooth" ]; then
+		if [ -e "/tmp/up_bt_on_resume" ]; then
+			systemctl start bluetooth
+			rm -f /tmp/up_bt_on_resume
+		fi
+	fi
+fi

meta-digi-dey/recipes-core/busybox/busybox-1.29.2/standby-systemd

@@ -0,0 +1,19 @@
+#!/bin/sh
+#===============================================================================
+#
+#  standby
+#
+#  Copyright (C) 2019 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: suspend system to RAM
+#
+#===============================================================================
+
+# Go to suspend using systemd's default suspend method
+systemctl suspend

meta-digi-dey/recipes-core/busybox/busybox_1.29.2.bbappend

@@ -3,6 +3,8 @@
 FILESEXTRAPATHS_prepend := "${THISDIR}/${BP}:"
 
 SRC_URI += "file://standby \
+            file://standby-actions \
+            file://standby-systemd \
             file://busybox-ntpd \
             file://index.html \
             file://digi-logo.png \
@@ -13,9 +15,13 @@ SRC_URI += "file://standby \
             file://bridgeifupdown \
            "
 
+HAS_SYSTEMD = "${@bb.utils.contains('DISTRO_FEATURES', 'systemd', 'true', 'false', d)}"
+
 # hwclock bootscript init parameters
 INITSCRIPT_PARAMS_${PN}-hwclock = "start 20 S . stop 20 0 6 ."
 
+FILES_${PN}_append = " ${systemd_unitdir}/system-sleep/"
+
 # NTPD package
 PACKAGES =+ "${PN}-ntpd"
 FILES_${PN}-ntpd = "${sysconfdir}/init.d/busybox-ntpd"
@@ -43,8 +49,17 @@ do_install_append() {
 		install -m 0644 ${WORKDIR}/index.html ${D}/srv/www/
 		install -m 0644 ${WORKDIR}/digi-logo.png ${D}/srv/www/
 	fi
-	# Install 'standby' script
+	# Install one standby script or another depending on having systemd or not
-	install -m 0755 ${WORKDIR}/standby ${D}${base_bindir}
+	if ${HAS_SYSTEMD}; then
+		# Install systemd version of 'standby' script
+		install -m 0755 ${WORKDIR}/standby-systemd ${D}${base_bindir}/standby
+		# Install systemd 'standby-actions' hook
+		install -d ${D}${systemd_unitdir}/system-sleep/
+		install -m 0755 ${WORKDIR}/standby-actions ${D}${systemd_unitdir}/system-sleep/
+	else
+		# Install 'standby' script
+		install -m 0755 ${WORKDIR}/standby ${D}${base_bindir}
+	fi
 	# Create a symlink called suspend to maintain backward compatibility
 	ln -s standby ${D}${base_bindir}/suspend
 	if grep "CONFIG_ACPID=y" ${WORKDIR}/defconfig; then