cmhw: Add AdaptiveBacklight support

Change-Id: I3406700fb51f3462fa3e0c7cb92344b79424f7ef

2 files changed, 80 insertions, 0 deletions

diff --git a/cmhw/org/cyanogenmod/hardware/AdaptiveBacklight.java b/cmhw/org/cyanogenmod/hardware/AdaptiveBacklight.java
new file mode 100644
index 0000000..bc2ebc3
--- /dev/null
+++ b/cmhw/org/cyanogenmod/hardware/AdaptiveBacklight.java
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2013 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.
+ */
+
+package org.cyanogenmod.hardware;
+
+import org.cyanogenmod.hardware.util.FileUtils;
+
+import android.os.SystemProperties;
+
+import java.io.File;
+
+/**
+ * Adaptive backlight support (this refers to technologies like NVIDIA SmartDimmer,
+ * QCOM CABL or Samsung CABC).
+ */
+public class AdaptiveBacklight {
+
+    private static String FILE_CABC = "/sys/devices/mdss_dsi_panel/cabc";
+
+    /**
+     * Whether device supports an adaptive backlight technology.
+     *
+     * @return boolean Supported devices must return always true
+     */
+    public static boolean isSupported() {
+        File f = new File(FILE_CABC);
+
+        if(f.exists()) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * This method return the current activation status of the adaptive backlight technology.
+     *
+     * @return boolean Must be false when adaptive backlight is not supported or not activated, or
+     * the operation failed while reading the status; true in any other case.
+     */
+    public static boolean isEnabled() {
+        if (Integer.parseInt(FileUtils.readOneLine(FILE_CABC)) == 1) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * This method allows to setup adaptive backlight technology status.
+     *
+     * @param status The new adaptive backlight status
+     * @return boolean Must be false if adaptive backlight is not supported or the operation
+     * failed; true in any other case.
+     */
+    public static boolean setEnabled(boolean status) {
+        if (status == true) {
+            return FileUtils.writeLine(FILE_CABC, "1");
+        } else {
+            return FileUtils.writeLine(FILE_CABC, "0");
+        }
+    }
+}
diff --git a/rootdir/init.qcom.rc b/rootdir/init.qcom.rc
index ec10735..9de8fee 100644
--- a/rootdir/init.qcom.rc
+++ b/rootdir/init.qcom.rc
@@ -191,6 +191,10 @@ on boot
     chmod 400 /sys/class/graphics/fb1/msm_fb_fps_level
     chmod 400 /sys/class/graphics/fb2/msm_fb_fps_level
 
+    # Adaptive backlight
+    chown system system /sys/devices/mdss_dsi_panel/cabc
+    chmod 0660 /sys/devices/mdss_dsi_panel/cabc
+
     # For bridgemgr daemon to inform the USB driver of the correct transport
     chown radio radio /sys/class/android_usb/f_rmnet_smd_sdio/transport