sdm845-common: Add support for display modes and HBM

Change-Id: Ic93612e6ffeb0103778bd05bfd1c2921e433cd9f

lineagehw/org/lineageos/hardware/DisplayModeControl.java

@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2015 The CyanogenMod Project
+ * Copyright (C) 2018 The LineageOS 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.lineageos.hardware;
+
+import android.util.Log;
+
+import lineageos.hardware.DisplayMode;
+import org.lineageos.internal.util.FileUtils;
+
+import java.util.HashMap;
+
+/*
+ * Display Modes API
+ *
+ * A device may implement a list of preset display modes for different
+ * viewing intents, such as movies, photos, or extra vibrance. These
+ * modes may have multiple components such as gamma correction, white
+ * point adjustment, etc, but are activated by a single control point.
+ *
+ * This API provides support for enumerating and selecting the
+ * modes supported by the hardware.
+ */
+
+public class DisplayModeControl {
+    private static final String MODE_PATH =
+            "/sys/devices/platform/soc/ae00000.qcom,mdss_mdp/main_display/display_mode";
+    private static final String DEFAULT_PATH = "/data/system/default_display_mode";
+
+    private static final HashMap<String, DisplayMode> MODE_MAP = new HashMap<>();
+    static {
+        MODE_MAP.put("default", new DisplayMode(0, "Standard"));
+        MODE_MAP.put("srgb", new DisplayMode(1, "sRGB"));
+        MODE_MAP.put("dci-p3", new DisplayMode(2, "DCI P3"));
+        MODE_MAP.put("adaption", new DisplayMode(3, "Adaptive"));
+
+        String storedDefaultMode = FileUtils.readOneLine(DEFAULT_PATH);
+        if (storedDefaultMode != null) {
+            FileUtils.writeLine(MODE_PATH, storedDefaultMode);
+        }
+    }
+
+    /*
+     * All HAF classes should export this boolean.
+     * Real implementations must, of course, return true
+     */
+    public static boolean isSupported() {
+        return FileUtils.isFileWritable(MODE_PATH);
+    }
+
+    /*
+     * Get the list of available modes. A mode has an integer
+     * identifier and a string name.
+     *
+     * It is the responsibility of the upper layers to
+     * map the name to a human-readable format or perform translation.
+     */
+    public static DisplayMode[] getAvailableModes() {
+        return MODE_MAP.values().toArray(new DisplayMode[MODE_MAP.size()]);
+    }
+
+    /*
+     * Get the name of the currently selected mode. This can return
+     * null if no mode is selected.
+     */
+    public static DisplayMode getCurrentMode() {
+        return MODE_MAP.get(FileUtils.readOneLine(MODE_PATH));
+    }
+
+    /*
+     * Selects a mode from the list of available modes by it's
+     * string identifier. Returns true on success, false for
+     * failure. It is up to the implementation to determine
+     * if this mode is valid.
+     */
+    public static boolean setMode(DisplayMode mode, boolean makeDefault) {
+        for (HashMap.Entry<String, DisplayMode> entry : MODE_MAP.entrySet()) {
+            if (entry.getValue().id == mode.id) {
+                if (FileUtils.writeLine(MODE_PATH, entry.getKey()) && makeDefault) {
+                    FileUtils.writeLine(DEFAULT_PATH, entry.getKey());
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
+    /*
+     * Gets the preferred default mode for this device by it's
+     * string identifier. Can return null if there is no default.
+     */
+    public static DisplayMode getDefaultMode() {
+        String storedDefaultMode = FileUtils.readOneLine(DEFAULT_PATH);
+        return MODE_MAP.get(storedDefaultMode != null ? storedDefaultMode : "default");
+    }
+}