liblights: Allow devices to override node paths

* Update the copyrights while we're at it.

Change-Id: Ie1bbf1f5150428a47baf6615f32d703d578efb82

liblights/Android.mk

@@ -1,4 +1,4 @@
-# Copyright (C) 2015 The CyanogenMod Project
+# Copyright (C) 2015-2016 The CyanogenMod Project
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -12,16 +12,20 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-LOCAL_PATH:= $(call my-dir)
-
 ifneq ($(TARGET_PROVIDES_LIBLIGHT),true)
 
+LOCAL_PATH := $(call my-dir)
+
 include $(CLEAR_VARS)
 
+LOCAL_SRC_FILES := lights.c
+
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
+
+LOCAL_SHARED_LIBRARIES := liblog
+
 LOCAL_MODULE := lights.$(TARGET_BOOTLOADER_BOARD_NAME)
 LOCAL_MODULE_RELATIVE_PATH := hw
-LOCAL_SHARED_LIBRARIES := liblog
-LOCAL_SRC_FILES := lights.c
 LOCAL_MODULE_TAGS := optional
 
 include $(BUILD_SHARED_LIBRARY)

liblights/include/samsung_lights.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2016 The CyanogenMod Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SAMSUNG_LIGHTS_H
+#define SAMSUNG_LIGHTS_H
+
+/*
+ * Board specific nodes
+ *
+ * If your kernel exposes these controls in another place, you can either
+ * symlink to the locations given here, or override this header in your
+ * device tree.
+ */
+#define PANEL_BRIGHTNESS_NODE "/sys/class/backlight/panel/brightness"
+#define BUTTON_BRIGHTNESS_NODE "/sys/class/sec/sec_touchkey/brightness"
+#define LED_BLINK_NODE "/sys/class/sec/led/led_blink"
+
+#endif // SAMSUNG_LIGHTS_H

liblights/lights.c

@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2013 The Android Open Source Project
- * Copyright (C) 2015 The CyanogenMod Project
+ * Copyright (C) 2015-2016 The CyanogenMod Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -31,9 +31,7 @@
 
 #include <hardware/lights.h>
 
-#define PANEL_FILE "/sys/class/backlight/panel/brightness"
+#include "samsung_lights.h"
-#define BUTTON_FILE "/sys/class/sec/sec_touchkey/brightness"
-#define LED_BLINK "/sys/class/sec/led/led_blink"
 
 #define COLOR_MASK 0x00ffffff
 
@@ -116,7 +114,7 @@ static int set_light_backlight(struct light_device_t *dev __unused,
     int brightness = rgb_to_brightness(state);
 
     pthread_mutex_lock(&g_lock);
-    err = write_int(PANEL_FILE, brightness);
+    err = write_int(PANEL_BRIGHTNESS_NODE, brightness);
 
     pthread_mutex_unlock(&g_lock);
     return err;
@@ -130,7 +128,7 @@ static int set_light_buttons(struct light_device_t* dev __unused,
 
     pthread_mutex_lock(&g_lock);
 
-    err = write_int(BUTTON_FILE, on ? 1 : 0);
+    err = write_int(BUTTON_BRIGHTNESS_NODE, on ? 1 : 0);
 
     pthread_mutex_unlock(&g_lock);
 
@@ -179,7 +177,7 @@ static int write_leds(const struct led_config *led)
     blink[count+1] = '\0';
 
     pthread_mutex_lock(&g_lock);
-    err = write_str(LED_BLINK, blink);
+    err = write_str(LED_BLINK_NODE, blink);
     pthread_mutex_unlock(&g_lock);
 
     return err;