From 35b33f0413c9f6a263549d63b2b068d74543d876 Mon Sep 17 00:00:00 2001
From: Jo-Philipp Wich <jo@mein.io>
Date: Wed, 8 Jun 2016 10:14:27 +0200
Subject: [PATCH] base-files: maintain LED config state

Record the state of any hardware LED configured through UCI and use that
information to revert the state when applying updated settings while
maintaining default behaviour of system LEDs.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
---
 package/base-files/files/etc/init.d/led | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/package/base-files/files/etc/init.d/led b/package/base-files/files/etc/init.d/led
index a6be788a5e..1d10f723d0 100755
--- a/package/base-files/files/etc/init.d/led
+++ b/package/base-files/files/etc/init.d/led
@@ -37,6 +37,12 @@ load_led() {
 	[ -e /sys/class/leds/${sysfs}/brightness ] && {
 		echo "setting up led ${name}"
 
+		printf "%s %s %d\n" \
+			"$sysfs" \
+			"$(sed -ne 's/^.*\[\(.*\)\].*$/\1/p' /sys/class/leds/${sysfs}/trigger)" \
+			"$(cat /sys/class/leds/${sysfs}/brightness)" \
+				>> /var/run/led.state
+
 		[ "$default" = 0 ] &&
 			echo 0 >/sys/class/leds/${sysfs}/brightness
 
@@ -103,11 +109,17 @@ load_led() {
 
 start() {
 	[ -e /sys/class/leds/ ] && {
-		local led
-		for led in /sys/class/leds/*; do
-			[ -e "$led/trigger" ] && echo "none" > "$led/trigger"
-			[ -e "$led/brightness" ] && echo "0" > "$led/brightness"
-		done
+		[ -s /var/run/led.state ] && {
+			local led trigger brightness
+			while read led trigger brightness; do
+				[ -e "/sys/class/leds/$led/trigger" ] && \
+					echo "$trigger" > "/sys/class/leds/$led/trigger"
+
+				[ -e "/sys/class/leds/$led/brightness" ] && \
+					echo "$brightness" > "/sys/class/leds/$led/brightness"
+			done < /var/run/led.state
+			rm /var/run/led.state
+		}
 
 		config_load system
 		config_foreach load_led led