beaglebone-capes: add a powerdown script as well

The current powerdown script disables the PMIC backlight

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Signed-off-by: Denys Dmytriyenko <denys@ti.com>

recipes-ti/beagleboard/beaglebone-capes.bb

@@ -3,10 +3,13 @@ DESCRIPTION = "Userspace setup for beaglebone capes"
 LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://${COREBASE}/LICENSE;md5=3f40d7994397109285ec7b81fdeb3b58"
 
+PR = "r1"
+
 inherit allarch
 
 SRC_URI = "file://cape.service \
            file://cape.sh \
+           file://cape-stop.sh \
           "
 
 do_install() {
@@ -17,7 +20,7 @@ do_install() {
 	ln -sf ../cape.service ${D}${base_libdir}/systemd/system/basic.target.wants/
 
 	install -d ${D}${bindir}
-	install -m 0755 ${WORKDIR}/cape.sh ${D}${bindir}
+	install -m 0755 ${WORKDIR}/cape*.sh ${D}${bindir}
 }
 
 FILES_${PN} += "${base_libdir}/systemd/system"

recipes-ti/beagleboard/beaglebone-capes/cape-stop.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+for eeprom in /sys/bus/i2c/devices/3-005*/eeprom ; do
+	PARTNUMBER=$(hexdump -e '8/1 "%c"' $eeprom -s 58 -n16)
+	case $PARTNUMBER in
+		"BB-BONE-LCD3-01.")
+				echo "Turning off backlight for LCD3 cape"
+				i2cset -f -y 1 0x24 0x07 0x00;;
+		*)
+				echo "unknown cape: $PARTNUMBER";;
+	esac
+done

recipes-ti/beagleboard/beaglebone-capes/cape.service

@@ -2,7 +2,10 @@
 Description=Beaglebone cape support
 
 [Service]
+Type=oneshot
+RemainAfterExit=yes
 ExecStart=/usr/bin/cape.sh
+ExecStop=/usr/bin/cape-stop.sh
 
 [Install]
 WantedBy=basic.target