fff-support: Update PoE passthrough code

This implements an upgrade safe solution for the PoE passthrough
on multiple devices. Since LEDE already provides the relevant
settings, a check whether those are in place enables both
identification of affected devices and automatic deactivation
if parameters are changed.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Tested-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Reviewed-by: Tim Niemeyer <tim@tn-x.org>

src/packages/fff/fff-config/files/etc/uci-defaults/98-configure-fff

@@ -23,3 +23,8 @@ uci -q set "simple-tc.example.limit_ingress=${traffic_in}"
 uci -q set "simple-tc.example.limit_egress=${traffic_out}"
 
 uci -q commit
+
+poe_passthrough=$(uci -q get "fff.poe_passthrough.active")
+if [ "$poe_passthrough" = "1" ] && [ -s /usr/lib/fff-support/activate_poe_passthrough.sh ] ; then
+	/usr/lib/fff-support/activate_poe_passthrough.sh
+fi

src/packages/fff/fff-support/Makefile

@@ -13,7 +13,7 @@ define Package/$(PKG_NAME)
     CATEGORY:=Freifunk
     TITLE:=Freifunk-Franken Support Scripts
     URL:=http://www.freifunk-franken.de
-    DEPENDS:=+@BUSYBOX_CONFIG_ASH
+    DEPENDS:=+@BUSYBOX_CONFIG_ASH +fff-config
 endef
 
 define Package/$(PKG_NAME)/description

src/packages/fff/fff-support/ar71xx/usr/lib/fff-support/activate_poe_passthrough.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+# This enables PoE passthrough so it is persistent through reboots,
+# but reset after firmware upgrade
+
+if uci -q get "system.poe_passthrough" > /dev/null ; then
+	uci -q set "system.poe_passthrough.value=1"
+	uci -q commit system
+	/etc/init.d/gpio_switch restart
+fi

src/packages/fff/fff-support/ar71xx/usr/lib/fff-support/disable_poe_passthrough.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+# This disables PoE passthrough permanently
+
+uci -q set "fff.poe_passthrough=fff"
+uci -q set "fff.poe_passthrough.active=0"
+uci -q commit fff
+
+if uci -q get "system.poe_passthrough" > /dev/null ; then
+	uci -q set "system.poe_passthrough.value=0"
+	uci -q commit system
+	/etc/init.d/gpio_switch restart
+fi

src/packages/fff/fff-support/ar71xx/usr/lib/fff-support/permanent_poe_passthrough.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+# This enables PoE passthrough permanently, so it is persistent
+# during firmware upgrades
+
+uci -q set "fff.poe_passthrough=fff"
+uci -q set "fff.poe_passthrough.active=1"
+uci -q commit fff
+
+/usr/lib/fff-support/activate_poe_passthrough.sh