From 9ce39213f4e21a5b080a101245ec63893e3e3a14 Mon Sep 17 00:00:00 2001
From: Michael Gernoth <michael@gernoth.net>
Date: Wed, 13 Jan 2016 23:06:07 +0100
Subject: add CMHW for ColorCalibration/LiveDisplay

This uses the color phase rotation hardware of Omap4 to set RGB
calibration values.

Change-Id: I101953fbac46235a178824f9d94470b4fe558b76
---
 .../hardware/DisplayColorCalibration.java          | 85 ++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 cmhw/org/cyanogenmod/hardware/DisplayColorCalibration.java

diff --git a/cmhw/org/cyanogenmod/hardware/DisplayColorCalibration.java b/cmhw/org/cyanogenmod/hardware/DisplayColorCalibration.java
new file mode 100644
index 0000000..bc6cc85
--- /dev/null
+++ b/cmhw/org/cyanogenmod/hardware/DisplayColorCalibration.java
@@ -0,0 +1,85 @@
+/*
+ * 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.
+ */
+
+ /*
+  * According to the OMAP color phase correction documentation,
+  * this happens:
+  *
+  * +-    -+         +-        -+   +-   -+
+  * | Rout |         | Rr Rg Rb |   | Rin |
+  * |      |    1    |          |   |     |
+  * | Gout | = --- * | Gr Gg Gb | * | Gin |
+  * |      |   256   |          |   |     |
+  * | Bout |         | Br Bg Bb |   | Bin |
+  * +-    -+         +-        -+   +-   -+
+  *
+  * So to get the unmodified color, the values for Rr, Gg and Bb should
+  * be set to 256, all others to 0. The values are 10 bit signed.
+  *
+  * This interface is exposed via sysfs and takes one line in the format:
+  * Rr Rg Rb Gr Gg Gb Br Bg Bb
+  */
+
+package org.cyanogenmod.hardware;
+
+import org.cyanogenmod.hardware.util.FileUtils;
+
+public class DisplayColorCalibration {
+    private static final String COLOR_FILE = "/sys/devices/platform/omapdss/manager0/cpr_coef";
+    private static final String COLOR_FILE_CTRL = "/sys/devices/platform/omapdss/manager0/cpr_enable";
+    private static int last_rgb[] = { 256, 256, 256 };
+
+    public static boolean isSupported() {
+        return true;
+    }
+
+    public static int getMaxValue()  {
+        return 256;
+    }
+
+    public static int getMinValue()  {
+        return 0;
+    }
+
+    public static int getDefValue() {
+        return getMaxValue();
+    }
+
+    public static String getCurColors()  {
+        return last_rgb[0] + " " + last_rgb[1] + " " + last_rgb[2];
+    }
+
+    public static boolean setColors(String colors)  {
+        String rgb[] = colors.split(" ");
+        String cpr_coefs = rgb[0] + " 0 0 0 " + rgb[1] + " 0 0 0 " + rgb[2];
+
+        if (last_rgb[0] == Integer.parseInt(rgb[0]) &&
+                last_rgb[1] == Integer.parseInt(rgb[1]) &&
+                last_rgb[2] == Integer.parseInt(rgb[2])) {
+            return true;
+        }
+
+        if (!FileUtils.writeLine(COLOR_FILE, cpr_coefs)) {
+            return false;
+        }
+
+        last_rgb[0] = Integer.parseInt(rgb[0]);
+        last_rgb[1] = Integer.parseInt(rgb[1]);
+        last_rgb[2] = Integer.parseInt(rgb[2]);
+
+        return FileUtils.writeLine(COLOR_FILE_CTRL, "1");
+    }
+}
-- 
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