backlight: add support for manual brightness

BoardConfig.mk

@@ -37,6 +37,9 @@ BOARD_BLUETOOTH_BDROID_BUILDCFG_INCLUDE_DIR := $(DEVICE_PATH)/bluetooth
 USE_CUSTOM_AUDIO_POLICY := 1
 USE_XML_AUDIO_POLICY_CONF := 1
 
+# Lights
+TARGET_SPECIFIC_HEADER_PATH := $(DEVICE_PATH)/include
+
 # Radio
 BOARD_HAVE_QCOM_FM := true
 

include/samsung_lights.h

@@ -0,0 +1,14 @@
+#ifndef SAMSUNG_LIGHTS_H
+#define SAMSUNG_LIGHTS_H
+
+/*
+ * Board specific nodes
+ *
+ * rubenslte exposes the panel backlight through the mdss_fb LED class
+ * device. There is no touchkey backlight or notification LED on this
+ * device.
+ */
+#define PANEL_BRIGHTNESS_NODE "/sys/class/leds/lcd-backlight/brightness"
+#define PANEL_MAX_BRIGHTNESS_NODE "/sys/class/leds/lcd-backlight/max_brightness"
+
+#endif  // SAMSUNG_LIGHTS_H

lineage_rubenslte.mk

@@ -21,6 +21,10 @@ PRODUCT_PACKAGES += fstab.qcom init.target.rc
 # Vibrator
 PRODUCT_PACKAGES += android.hardware.vibrator@1.0-impl
 
+# Lights
+PRODUCT_PACKAGES += \
+    android.hardware.light@2.0-service.samsung
+
 # Overlays
 DEVICE_PACKAGE_OVERLAYS += $(LOCAL_PATH)/overlay-lineage
 

manifest.xml

@@ -1,4 +1,13 @@
 <manifest version="1.0" type="device">
+    <hal format="hidl">
+        <name>android.hardware.light</name>
+        <transport>hwbinder</transport>
+        <version>2.0</version>
+        <interface>
+            <name>ILight</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
     <hal format="hidl">
         <name>android.hardware.vibrator</name>
         <transport arch="32">passthrough</transport>