base-files/leds: add setting the LED color via uci

Add the possibility that colored LEDs can also be configured via the uci.

config led 'led1'
	option name '<name>'
	option sysfs '<path>'
	option trigger 'default-on'
	option default '1'
-->	option color_{$color} '<0-255>'

The supported names of the variable "${color}" for the selected LED can be
queried in the file with the name 'multi_index'.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

diff --git a/package/base-files/files/etc/init.d/led b/package/base-files/files/etc/init.d/led
index 4d3feddf649ba935f8ba2ade5b6a22ae6c9a3243..ea2688cab29efaf74ad8ed0c08f6e571511fb19b 100755 (executable)
--- a/package/base-files/files/etc/init.d/led
+++ b/package/base-files/files/etc/init.d/led
@@ -3,6 +3,39 @@
 
 START=96
 
+led_color_set() {
+       local cfg="$1"
+       local sysfs="$2"
+
+       local max_b
+       local colors
+       local color
+       local multi_intensity
+       local value
+       local write
+
+       [ -e /sys/class/leds/${sysfs}/multi_intensity ] || return
+       [ -e /sys/class/leds/${sysfs}/multi_index ] || return
+
+       max_b="$(cat /sys/class/leds/${sysfs}/max_brightness)"
+       colors="$(cat /sys/class/leds/${sysfs}/multi_index | tr " " "\n")"
+       multi_intensity=""
+       for color in $colors; do
+               config_get value $1 "color_${color}" "0"
+               [ "$value" -gt 0 ] && write=1
+               [ "$value" -gt "$max_b" ] && value="$max_b"
+               multi_intensity="${multi_intensity}${value} "
+       done
+
+       # Check if any color is configured
+       [ "$write" = 1 ] || return
+       # Remove last whitespace
+       multi_intensity="${multi_intensity:0:-1}"
+
+       echo "setting '${name}' led color to '${multi_intensity}'"
+       echo "${multi_intensity}" > /sys/class/leds/${sysfs}/multi_intensity
+}
+
 load_led() {
        local name
        local sysfs
@@ -68,6 +101,8 @@ load_led() {
                [ $default = 1 ] &&
                        cat /sys/class/leds/${sysfs}/max_brightness > /sys/class/leds/${sysfs}/brightness
 
+               led_color_set "$1" "$sysfs"
+
                echo $trigger > /sys/class/leds/${sysfs}/trigger 2> /dev/null
                ret="$?"
                [ $ret = 0 ] || {