ccimx93: standby: customize script support for systemd

We need to take in account if the IW612 chip (WiFi/Bt) is going to be powered
off on suspend state. In such a case, we need to unload the driver modules and
restore the expected tty speed for Bluetooth, so that functionality is restored
back on resume.

https://onedigi.atlassian.net/browse/DEL-8489

Signed-off-by: Isaac Hermida <isaac.hermida@digi.com>

meta-digi-dey/recipes-core/busybox/busybox/ccimx93/standby-actions

@@ -0,0 +1,60 @@
+#!/bin/sh
+#===============================================================================
+#
+#  standby-actions
+#
+#  Copyright (C) 2023 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
+#
+#===============================================================================
+
+SUSPEND_WLAN_IFACES="/tmp/suspend_wlan_ifaces"
+
+actions_needed() {
+	[ -d "/proc/device-tree/wireless" ] && [ ! -e "/sys/firmware/devicetree/base/soc@0/bus@42800000/mmc@428b0000/keep-power-in-suspend" ]
+}
+
+if [ "${1}" = "pre" ]; then
+	# Stop NetworkManager before suspend
+	systemctl stop NetworkManager
+
+	if actions_needed; then
+		rm -f "${SUSPEND_WLAN_IFACES}"
+		for iface in mlan0 uap0 wfd0; do
+			if grep -qs ${iface} /var/run/ifstate; then
+				ifdown ${iface} && echo ${iface} >> "${SUSPEND_WLAN_IFACES}"
+			fi
+		done
+
+		rmmod moal
+		rmmod mlan
+
+		systemctl stop bluetooth
+		systemctl stop bluetooth-init
+		stty -F /dev/ttyBt 115200
+	fi
+elif [ "${1}" = "post" ]; then
+	if actions_needed; then
+		/etc/udev/scripts/load_iw612.sh
+		sleep 0.5
+
+		while read -r iface; do
+			ifup "${iface}"
+		done < "${SUSPEND_WLAN_IFACES}"
+		rm -f "${SUSPEND_WLAN_IFACES}"
+
+		systemctl start bluetooth-init
+		systemctl start bluetooth
+	fi
+
+	# Resume NetworkManager after suspend
+	systemctl start NetworkManager
+fi