WIFI: systemd: add suspend/resume service

For supporting suspend/resume with wifi activate,
brcmfmac MUST be unbinding before each suspend.

Signed-off-by: Christophe Priouzeau <christophe.priouzeau@st.com>

recipes-connectivity/wifi/wifi-suspend/wifi-brcmfmac-sleep.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Wifi brcmfmac sleep hook
+Before=sleep.target
+StopWhenUnneeded=yes
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=-/usr/bin/wifi_brcmfmac_driver.sh unbind
+ExecStop=-/usr/bin/wifi_brcmfmac_driver.sh bind
+
+[Install]
+WantedBy=sleep.target

recipes-connectivity/wifi/wifi-suspend/wifi_brcmfmac_driver.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+SDMMC_PATH=/sys/bus/amba/drivers/mmci-pl18x
+
+if [ -d $SDMMC_PATH ];
+then
+
+	if [ ! -d /sys/bus/sdio/drivers/brcmfmac ];
+	then
+		exit 1;
+	fi
+
+case $1 in
+bind)
+	echo "bind driver brcmfmac/sdmmc";
+	echo "bind driver brcmfmac/sdmmc" > /dev/kmsg
+	echo 58007000.sdmmc >  $SDMMC_PATH/bind
+	;;
+unbind)
+	echo "unbind driver brcmfmac/sdmmc";
+	echo "unbind driver brcmfmac/sdmmc" > /dev/kmsg
+	echo 58007000.sdmmc >  $SDMMC_PATH/unbind
+	;;
+*)
+	echo "$0 [bind|unbind]"
+	echo "Bind/Unbind wifi driver brcmfmac."
+	;;
+esac
+
+fi