Added adb commands to set and reset brightness.

adb shell cmd display set-brightness BRIGHTNESS command sets the
screen brightness programatically.
adb shell cmd display reset-brightness resets the brightness
configuration to the default configuration.

Test: run "adb shell cmd display set-brightness <number>" and watch
      the magic happen.

Test: run "adb shell cmd jobscheduler run -f
      com.google.android.apps.turbo 104" to push a new configuration,
      then run "adb shell cmd display reset-brightness-configuration"
      to reset it. If it's not noticable enough, you can manually
      edit /data/system/display-manager-state.xml: for example, set
      nits="0.0" for all the <brightness-point />s in the
      <brightness-curve /> to make it as dark as posible.

Fixes: 77574628

Change-Id: I37e19c1e662370e60c9f616a3710780f16418620

2 files changed, 119 insertions, 1 deletions

diff --git a/services/core/java/com/android/server/display/DisplayManagerService.java b/services/core/java/com/android/server/display/DisplayManagerService.java
index c7ae1f4f5e50..93e0bd5b45c5 100644
--- a/services/core/java/com/android/server/display/DisplayManagerService.java
+++ b/services/core/java/com/android/server/display/DisplayManagerService.java
@@ -61,12 +61,15 @@ import android.os.Message;
 import android.os.PowerManager;
 import android.os.Process;
 import android.os.RemoteException;
+import android.os.ResultReceiver;
 import android.os.ServiceManager;
+import android.os.ShellCallback;
 import android.os.SystemClock;
 import android.os.SystemProperties;
 import android.os.Trace;
 import android.os.UserHandle;
 import android.os.UserManager;
+import android.provider.Settings;
 import android.text.TextUtils;
 import android.util.IntArray;
 import android.util.Slog;
@@ -1030,7 +1033,7 @@ public final class DisplayManagerService extends SystemService {
     }
 
     private void setBrightnessConfigurationForUserInternal(
-            @NonNull BrightnessConfiguration c, @UserIdInt int userId,
+            @Nullable BrightnessConfiguration c, @UserIdInt int userId,
             @Nullable String packageName) {
         final int userSerial = getUserManager().getUserSerialNumber(userId);
         synchronized (mSyncRoot) {
@@ -1983,6 +1986,29 @@ public final class DisplayManagerService extends SystemService {
             }
         }
 
+        @Override // Binder call
+        public void onShellCommand(FileDescriptor in, FileDescriptor out,
+                FileDescriptor err, String[] args, ShellCallback callback,
+                ResultReceiver resultReceiver) {
+            final long token = Binder.clearCallingIdentity();
+            try {
+                DisplayManagerShellCommand command = new DisplayManagerShellCommand(this);
+                command.exec(this, in, out, err, args, callback, resultReceiver);
+            } finally {
+                Binder.restoreCallingIdentity(token);
+            }
+        }
+
+        void setBrightness(int brightness) {
+            Settings.System.putIntForUser(mContext.getContentResolver(),
+                    Settings.System.SCREEN_BRIGHTNESS, brightness, UserHandle.USER_CURRENT);
+        }
+
+        void resetBrightnessConfiguration() {
+            setBrightnessConfigurationForUserInternal(null, mContext.getUserId(),
+                    mContext.getPackageName());
+        }
+
         private boolean validatePackageName(int uid, String packageName) {
             if (packageName != null) {
                 String[] packageNames = mContext.getPackageManager().getPackagesForUid(uid);
diff --git a/services/core/java/com/android/server/display/DisplayManagerShellCommand.java b/services/core/java/com/android/server/display/DisplayManagerShellCommand.java
new file mode 100644
index 000000000000..27cad1eece09
--- /dev/null
+++ b/services/core/java/com/android/server/display/DisplayManagerShellCommand.java
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2018 The Android Open Source 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 com.android.server.display;
+
+import android.content.Intent;
+import android.os.RemoteException;
+import android.os.ResultReceiver;
+import android.os.ShellCallback;
+import android.os.ShellCommand;
+import android.util.Slog;
+
+import java.io.PrintWriter;
+import java.lang.NumberFormatException;
+
+class DisplayManagerShellCommand extends ShellCommand {
+    private static final String TAG = "DisplayManagerShellCommand";
+
+    private final DisplayManagerService.BinderService mService;
+
+    DisplayManagerShellCommand(DisplayManagerService.BinderService service) {
+        mService = service;
+    }
+
+    @Override
+    public int onCommand(String cmd) {
+        if (cmd == null) {
+            return handleDefaultCommands(cmd);
+        }
+        final PrintWriter pw = getOutPrintWriter();
+        switch(cmd) {
+            case "set-brightness":
+                return setBrightness();
+            case "reset-brightness-configuration":
+                return resetBrightnessConfiguration();
+            default:
+                return handleDefaultCommands(cmd);
+        }
+    }
+
+    @Override
+    public void onHelp() {
+        final PrintWriter pw = getOutPrintWriter();
+        pw.println("Display manager commands:");
+        pw.println("  help");
+        pw.println("    Print this help text.");
+        pw.println();
+        pw.println("  set-brightness BRIGHTNESS");
+        pw.println("    Sets the current brightness to BRIGHTNESS (a number between 0 and 1).");
+        pw.println("  reset-brightness-configuration");
+        pw.println("    Reset the brightness to its default configuration.");
+        pw.println();
+        Intent.printIntentArgsHelp(pw , "");
+    }
+
+    private int setBrightness() {
+        String brightnessText = getNextArg();
+        if (brightnessText == null) {
+            getErrPrintWriter().println("Error: no brightness specified");
+            return 1;
+        }
+        float brightness = -1;
+        try {
+            brightness = Float.parseFloat(brightnessText);
+        } catch (NumberFormatException e) {
+        }
+        if (brightness < 0 || brightness > 1) {
+            getErrPrintWriter().println("Error: brightness should be a number between 0 and 1");
+            return 1;
+        }
+        mService.setBrightness((int) brightness * 255);
+        return 0;
+    }
+
+    private int resetBrightnessConfiguration() {
+        mService.resetBrightnessConfiguration();
+        return 0;
+    }
+}