diff --git a/core/api/test-current.txt b/core/api/test-current.txt
index 25c4652..ddf7578 100644
--- a/core/api/test-current.txt
+++ b/core/api/test-current.txt
@@ -38,6 +38,7 @@
     field public static final String READ_CELL_BROADCASTS = "android.permission.READ_CELL_BROADCASTS";
     field public static final String READ_PRIVILEGED_PHONE_STATE = "android.permission.READ_PRIVILEGED_PHONE_STATE";
     field public static final String RECORD_BACKGROUND_AUDIO = "android.permission.RECORD_BACKGROUND_AUDIO";
+    field public static final String REMAP_MODIFIER_KEYS = "android.permission.REMAP_MODIFIER_KEYS";
     field public static final String REMOVE_TASKS = "android.permission.REMOVE_TASKS";
     field public static final String REQUEST_UNIQUE_ID_ATTESTATION = "android.permission.REQUEST_UNIQUE_ID_ATTESTATION";
     field public static final String RESET_APP_ERRORS = "android.permission.RESET_APP_ERRORS";
@@ -1294,8 +1295,11 @@
 
   public final class InputManager {
     method public void addUniqueIdAssociation(@NonNull String, @NonNull String);
+    method @RequiresPermission(android.Manifest.permission.REMAP_MODIFIER_KEYS) public void clearAllModifierKeyRemappings();
     method @Nullable public String getCurrentKeyboardLayoutForInputDevice(@NonNull android.hardware.input.InputDeviceIdentifier);
     method @NonNull public java.util.List<java.lang.String> getKeyboardLayoutDescriptorsForInputDevice(@NonNull android.view.InputDevice);
+    method @NonNull @RequiresPermission(android.Manifest.permission.REMAP_MODIFIER_KEYS) public java.util.Map<java.lang.Integer,java.lang.Integer> getModifierKeyRemapping();
+    method @RequiresPermission(android.Manifest.permission.REMAP_MODIFIER_KEYS) public void remapModifierKey(int, int);
     method @RequiresPermission(android.Manifest.permission.SET_KEYBOARD_LAYOUT) public void removeKeyboardLayoutForInputDevice(@NonNull android.hardware.input.InputDeviceIdentifier, @NonNull String);
     method public void removeUniqueIdAssociation(@NonNull String);
     method @RequiresPermission(android.Manifest.permission.SET_KEYBOARD_LAYOUT) public void setCurrentKeyboardLayoutForInputDevice(@NonNull android.hardware.input.InputDeviceIdentifier, @NonNull String);
diff --git a/core/java/android/hardware/input/IInputManager.aidl b/core/java/android/hardware/input/IInputManager.aidl
index b26c0a2..eef0f42 100644
--- a/core/java/android/hardware/input/IInputManager.aidl
+++ b/core/java/android/hardware/input/IInputManager.aidl
@@ -123,6 +123,22 @@
     String[] getKeyboardLayoutListForInputDevice(in InputDeviceIdentifier identifier, int userId,
             in InputMethodInfo imeInfo, in InputMethodSubtype imeSubtype);
 
+    // Modifier key remapping APIs.
+    @EnforcePermission("REMAP_MODIFIER_KEYS")
+    @JavaPassthrough(annotation="@android.annotation.RequiresPermission(value = "
+            + "android.Manifest.permission.REMAP_MODIFIER_KEYS)")
+    void remapModifierKey(int fromKey, int toKey);
+
+    @EnforcePermission("REMAP_MODIFIER_KEYS")
+    @JavaPassthrough(annotation="@android.annotation.RequiresPermission(value = "
+            + "android.Manifest.permission.REMAP_MODIFIER_KEYS)")
+    void clearAllModifierKeyRemappings();
+
+    @EnforcePermission("REMAP_MODIFIER_KEYS")
+    @JavaPassthrough(annotation="@android.annotation.RequiresPermission(value = "
+            + "android.Manifest.permission.REMAP_MODIFIER_KEYS)")
+    Map getModifierKeyRemapping();
+
     // Registers an input devices changed listener.
     void registerInputDevicesChangedListener(IInputDevicesChangedListener listener);
 
diff --git a/core/java/android/hardware/input/InputManager.java b/core/java/android/hardware/input/InputManager.java
index cea3fa1..3735417 100644
--- a/core/java/android/hardware/input/InputManager.java
+++ b/core/java/android/hardware/input/InputManager.java
@@ -78,6 +78,7 @@
 import java.lang.annotation.RetentionPolicy;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Map;
 import java.util.Objects;
 import java.util.concurrent.Executor;
 
@@ -253,6 +254,31 @@
     })
     public @interface SwitchState {}
 
+    /** @hide */
+    @Retention(RetentionPolicy.SOURCE)
+    @IntDef(prefix = { "REMAPPABLE_MODIFIER_KEY_" }, value = {
+            RemappableModifierKey.REMAPPABLE_MODIFIER_KEY_CTRL_LEFT,
+            RemappableModifierKey.REMAPPABLE_MODIFIER_KEY_CTRL_RIGHT,
+            RemappableModifierKey.REMAPPABLE_MODIFIER_KEY_META_LEFT,
+            RemappableModifierKey.REMAPPABLE_MODIFIER_KEY_META_RIGHT,
+            RemappableModifierKey.REMAPPABLE_MODIFIER_KEY_ALT_LEFT,
+            RemappableModifierKey.REMAPPABLE_MODIFIER_KEY_ALT_RIGHT,
+            RemappableModifierKey.REMAPPABLE_MODIFIER_KEY_SHIFT_LEFT,
+            RemappableModifierKey.REMAPPABLE_MODIFIER_KEY_SHIFT_RIGHT,
+            RemappableModifierKey.REMAPPABLE_MODIFIER_KEY_CAPS_LOCK,
+    })
+    public @interface RemappableModifierKey {
+        int REMAPPABLE_MODIFIER_KEY_CTRL_LEFT = KeyEvent.KEYCODE_CTRL_LEFT;
+        int REMAPPABLE_MODIFIER_KEY_CTRL_RIGHT = KeyEvent.KEYCODE_CTRL_RIGHT;
+        int REMAPPABLE_MODIFIER_KEY_META_LEFT = KeyEvent.KEYCODE_META_LEFT;
+        int REMAPPABLE_MODIFIER_KEY_META_RIGHT = KeyEvent.KEYCODE_META_RIGHT;
+        int REMAPPABLE_MODIFIER_KEY_ALT_LEFT = KeyEvent.KEYCODE_ALT_LEFT;
+        int REMAPPABLE_MODIFIER_KEY_ALT_RIGHT = KeyEvent.KEYCODE_ALT_RIGHT;
+        int REMAPPABLE_MODIFIER_KEY_SHIFT_LEFT = KeyEvent.KEYCODE_SHIFT_LEFT;
+        int REMAPPABLE_MODIFIER_KEY_SHIFT_RIGHT = KeyEvent.KEYCODE_SHIFT_RIGHT;
+        int REMAPPABLE_MODIFIER_KEY_CAPS_LOCK = KeyEvent.KEYCODE_CAPS_LOCK;
+    }
+
     /**
      * Switch State: Unknown.
      *
@@ -854,6 +880,60 @@
     }
 
     /**
+     * Remaps modifier keys. Remapping a modifier key to itself will clear any previous remappings
+     * for that key.
+     *
+     * @param fromKey The modifier key getting remapped.
+     * @param toKey The modifier key that it is remapped to.
+     *
+     * @hide
+     */
+    @TestApi
+    @RequiresPermission(Manifest.permission.REMAP_MODIFIER_KEYS)
+    public void remapModifierKey(@RemappableModifierKey int fromKey,
+            @RemappableModifierKey int toKey) {
+        try {
+            mIm.remapModifierKey(fromKey, toKey);
+        } catch (RemoteException ex) {
+            throw ex.rethrowFromSystemServer();
+        }
+    }
+
+    /**
+     * Clears all existing modifier key remappings
+     *
+     * @hide
+     */
+    @TestApi
+    @RequiresPermission(Manifest.permission.REMAP_MODIFIER_KEYS)
+    public void clearAllModifierKeyRemappings() {
+        try {
+            mIm.clearAllModifierKeyRemappings();
+        } catch (RemoteException ex) {
+            throw ex.rethrowFromSystemServer();
+        }
+    }
+
+    /**
+     * Provides the current modifier key remapping
+     *
+     * @return a {fromKey, toKey} map that contains the existing modifier key remappings..
+     * {@link RemappableModifierKey}
+     *
+     * @hide
+     */
+    @TestApi
+    @NonNull
+    @RequiresPermission(Manifest.permission.REMAP_MODIFIER_KEYS)
+    public Map<Integer, Integer> getModifierKeyRemapping() {
+        try {
+            return mIm.getModifierKeyRemapping();
+        } catch (RemoteException ex) {
+            throw ex.rethrowFromSystemServer();
+        }
+    }
+
+    /**
      * Gets the TouchCalibration applied to the specified input device's coordinates.
      *
      * @param inputDeviceDescriptor The input device descriptor.
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 8da91ee..9e9b41c 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -6764,6 +6764,14 @@
          @hide -->
     <permission android:name="android.permission.HANDLE_QUERY_PACKAGE_RESTART"
                 android:protectionLevel="signature" />
+
+    <!-- Allows low-level access to re-mapping modifier keys.
+         <p>Not for use by third-party applications.
+         @hide
+         @TestApi -->
+    <permission android:name="android.permission.REMAP_MODIFIER_KEYS"
+                android:protectionLevel="signature" />
+
     <uses-permission android:name="android.permission.HANDLE_QUERY_PACKAGE_RESTART" />
 
     <!-- Allows financed device kiosk apps to perform actions on the Device Lock service
diff --git a/packages/Shell/AndroidManifest.xml b/packages/Shell/AndroidManifest.xml
index d3ba5e6..973d0de 100644
--- a/packages/Shell/AndroidManifest.xml
+++ b/packages/Shell/AndroidManifest.xml
@@ -774,6 +774,9 @@
     <!-- Permissions required for CTS test - CtsAppFgsTestCases -->
     <uses-permission android:name="android.permission.USE_EXACT_ALARM" />
 
+    <!-- Permission required for CTS test - CtsHardwareTestCases -->
+    <uses-permission android:name="android.permission.REMAP_MODIFIER_KEYS" />
+
     <!-- Permissions required for CTS test - CtsAppFgsTestCases -->
     <uses-permission android:name="android.permission.health.READ_ACTIVE_CALORIES_BURNED" />
     <uses-permission android:name="android.permission.health.READ_BASAL_BODY_TEMPERATURE" />
diff --git a/services/core/java/com/android/server/input/InputManagerService.java b/services/core/java/com/android/server/input/InputManagerService.java
index 81d782e..0da04a2 100644
--- a/services/core/java/com/android/server/input/InputManagerService.java
+++ b/services/core/java/com/android/server/input/InputManagerService.java
@@ -294,6 +294,9 @@
     // Manages Keyboard backlight
     private final KeyboardBacklightController mKeyboardBacklightController;
 
+    // Manages Keyboard modifier keys remapping
+    private final KeyRemapper mKeyRemapper;
+
     // Maximum number of milliseconds to wait for input event injection.
     private static final int INJECTION_TIMEOUT_MILLIS = 30 * 1000;
 
@@ -408,6 +411,7 @@
         mBatteryController = new BatteryController(mContext, mNative, injector.getLooper());
         mKeyboardBacklightController = new KeyboardBacklightController(mContext, mNative,
                 mDataStore, injector.getLooper());
+        mKeyRemapper = new KeyRemapper(mContext, mNative, mDataStore, injector.getLooper());
 
         mUseDevInputEventForAudioJack =
                 mContext.getResources().getBoolean(R.bool.config_useDevInputEventForAudioJack);
@@ -536,6 +540,7 @@
         mKeyboardLayoutManager.systemRunning();
         mBatteryController.systemRunning();
         mKeyboardBacklightController.systemRunning();
+        mKeyRemapper.systemRunning();
     }
 
     private void reloadDeviceAliases() {
@@ -2738,6 +2743,27 @@
         return mKeyboardLayoutManager.getKeyboardLayoutOverlay(identifier);
     }
 
+    @EnforcePermission(Manifest.permission.REMAP_MODIFIER_KEYS)
+    @Override // Binder call
+    public void remapModifierKey(int fromKey, int toKey) {
+        super.remapModifierKey_enforcePermission();
+        mKeyRemapper.remapKey(fromKey, toKey);
+    }
+
+    @EnforcePermission(Manifest.permission.REMAP_MODIFIER_KEYS)
+    @Override // Binder call
+    public void clearAllModifierKeyRemappings() {
+        super.clearAllModifierKeyRemappings_enforcePermission();
+        mKeyRemapper.clearAllKeyRemappings();
+    }
+
+    @EnforcePermission(Manifest.permission.REMAP_MODIFIER_KEYS)
+    @Override // Binder call
+    public Map<Integer, Integer> getModifierKeyRemapping() {
+        super.getModifierKeyRemapping_enforcePermission();
+        return mKeyRemapper.getKeyRemapping();
+    }
+
     // Native callback.
     @SuppressWarnings("unused")
     private String getDeviceAlias(String uniqueId) {
diff --git a/services/core/java/com/android/server/input/KeyRemapper.java b/services/core/java/com/android/server/input/KeyRemapper.java
new file mode 100644
index 0000000..950e094
--- /dev/null
+++ b/services/core/java/com/android/server/input/KeyRemapper.java
@@ -0,0 +1,161 @@
+/*
+ * Copyright (C) 2022 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.input;
+
+import android.content.Context;
+import android.hardware.input.InputManager;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.Message;
+import android.view.InputDevice;
+
+import com.android.internal.annotations.GuardedBy;
+
+import java.util.Map;
+import java.util.Objects;
+
+/**
+ * A component of {@link InputManagerService} responsible for managing key remappings.
+ *
+ * @hide
+ */
+final class KeyRemapper implements InputManager.InputDeviceListener {
+
+    private static final int MSG_UPDATE_EXISTING_DEVICES = 1;
+    private static final int MSG_REMAP_KEY = 2;
+    private static final int MSG_CLEAR_ALL_REMAPPING = 3;
+
+    private final Context mContext;
+    private final NativeInputManagerService mNative;
+    // The PersistentDataStore should be locked before use.
+    @GuardedBy("mDataStore")
+    private final PersistentDataStore mDataStore;
+    private final Handler mHandler;
+
+    KeyRemapper(Context context, NativeInputManagerService nativeService,
+            PersistentDataStore dataStore, Looper looper) {
+        mContext = context;
+        mNative = nativeService;
+        mDataStore = dataStore;
+        mHandler = new Handler(looper, this::handleMessage);
+    }
+
+    public void systemRunning() {
+        InputManager inputManager = Objects.requireNonNull(
+                mContext.getSystemService(InputManager.class));
+        inputManager.registerInputDeviceListener(this, mHandler);
+
+        Message msg = Message.obtain(mHandler, MSG_UPDATE_EXISTING_DEVICES,
+                inputManager.getInputDeviceIds());
+        mHandler.sendMessage(msg);
+    }
+
+    public void remapKey(int fromKey, int toKey) {
+        Message msg = Message.obtain(mHandler, MSG_REMAP_KEY, fromKey, toKey);
+        mHandler.sendMessage(msg);
+    }
+
+    public void clearAllKeyRemappings() {
+        Message msg = Message.obtain(mHandler, MSG_CLEAR_ALL_REMAPPING);
+        mHandler.sendMessage(msg);
+    }
+
+    public Map<Integer, Integer> getKeyRemapping() {
+        synchronized (mDataStore) {
+            return mDataStore.getKeyRemapping();
+        }
+    }
+
+    private void addKeyRemapping(int fromKey, int toKey) {
+        InputManager inputManager = Objects.requireNonNull(
+                mContext.getSystemService(InputManager.class));
+        for (int deviceId : inputManager.getInputDeviceIds()) {
+            InputDevice inputDevice = inputManager.getInputDevice(deviceId);
+            if (inputDevice != null && !inputDevice.isVirtual() && inputDevice.isFullKeyboard()) {
+                mNative.addKeyRemapping(deviceId, fromKey, toKey);
+            }
+        }
+    }
+
+    private void remapKeyInternal(int fromKey, int toKey) {
+        addKeyRemapping(fromKey, toKey);
+        synchronized (mDataStore) {
+            try {
+                if (fromKey == toKey) {
+                    mDataStore.clearMappedKey(fromKey);
+                } else {
+                    mDataStore.remapKey(fromKey, toKey);
+                }
+            } finally {
+                mDataStore.saveIfNeeded();
+            }
+        }
+    }
+
+    private void clearAllRemappingsInternal() {
+        synchronized (mDataStore) {
+            try {
+                Map<Integer, Integer> keyRemapping = mDataStore.getKeyRemapping();
+                for (int fromKey : keyRemapping.keySet()) {
+                    mDataStore.clearMappedKey(fromKey);
+
+                    // Remapping to itself will clear the remapping on native side
+                    addKeyRemapping(fromKey, fromKey);
+                }
+            } finally {
+                mDataStore.saveIfNeeded();
+            }
+        }
+    }
+
+    @Override
+    public void onInputDeviceAdded(int deviceId) {
+        InputManager inputManager = Objects.requireNonNull(
+                mContext.getSystemService(InputManager.class));
+        InputDevice inputDevice = inputManager.getInputDevice(deviceId);
+        if (inputDevice != null && !inputDevice.isVirtual() && inputDevice.isFullKeyboard()) {
+            Map<Integer, Integer> remapping = getKeyRemapping();
+            remapping.forEach(
+                    (fromKey, toKey) -> mNative.addKeyRemapping(deviceId, fromKey, toKey));
+        }
+    }
+
+    @Override
+    public void onInputDeviceRemoved(int deviceId) {
+    }
+
+    @Override
+    public void onInputDeviceChanged(int deviceId) {
+    }
+
+    private boolean handleMessage(Message msg) {
+        switch (msg.what) {
+            case MSG_UPDATE_EXISTING_DEVICES:
+                for (int deviceId : (int[]) msg.obj) {
+                    onInputDeviceAdded(deviceId);
+                }
+                return true;
+            case MSG_REMAP_KEY:
+                remapKeyInternal(msg.arg1, msg.arg2);
+                return true;
+            case MSG_CLEAR_ALL_REMAPPING:
+                clearAllRemappingsInternal();
+                return true;
+        }
+        return false;
+    }
+}
diff --git a/services/core/java/com/android/server/input/NativeInputManagerService.java b/services/core/java/com/android/server/input/NativeInputManagerService.java
index cfa7fb1..8781c6e 100644
--- a/services/core/java/com/android/server/input/NativeInputManagerService.java
+++ b/services/core/java/com/android/server/input/NativeInputManagerService.java
@@ -47,6 +47,8 @@
 
     int getSwitchState(int deviceId, int sourceMask, int sw);
 
+    void addKeyRemapping(int deviceId, int fromKeyCode, int toKeyCode);
+
     boolean hasKeys(int deviceId, int sourceMask, int[] keyCodes, boolean[] keyExists);
 
     int getKeyCodeForKeyLocation(int deviceId, int locationKeyCode);
@@ -235,6 +237,9 @@
         public native int getSwitchState(int deviceId, int sourceMask, int sw);
 
         @Override
+        public native void addKeyRemapping(int deviceId, int fromKeyCode, int toKeyCode);
+
+        @Override
         public native boolean hasKeys(int deviceId, int sourceMask, int[] keyCodes,
                 boolean[] keyExists);
 
diff --git a/services/core/java/com/android/server/input/PersistentDataStore.java b/services/core/java/com/android/server/input/PersistentDataStore.java
index 1bb10c7..375377a7 100644
--- a/services/core/java/com/android/server/input/PersistentDataStore.java
+++ b/services/core/java/com/android/server/input/PersistentDataStore.java
@@ -27,14 +27,13 @@
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.util.ArrayUtils;
 import com.android.internal.util.XmlUtils;
+import com.android.modules.utils.TypedXmlPullParser;
+import com.android.modules.utils.TypedXmlSerializer;
 
 import libcore.io.IoUtils;
 
 import org.xmlpull.v1.XmlPullParserException;
 
-import com.android.modules.utils.TypedXmlPullParser;
-import com.android.modules.utils.TypedXmlSerializer;
-
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
@@ -64,6 +63,8 @@
 final class PersistentDataStore {
     static final String TAG = "InputManager";
 
+    private static final int INVALID_VALUE = -1;
+
     // Input device state by descriptor.
     private final HashMap<String, InputDeviceState> mInputDevices =
             new HashMap<String, InputDeviceState>();
@@ -77,6 +78,9 @@
     // True if there are changes to be saved.
     private boolean mDirty;
 
+    // Storing key remapping
+    private Map<Integer, Integer> mKeyRemapping = new HashMap<>();
+
     public PersistentDataStore() {
         this(new Injector());
     }
@@ -187,6 +191,30 @@
         return state.getKeyboardBacklightBrightness(lightId);
     }
 
+    public boolean remapKey(int fromKey, int toKey) {
+        loadIfNeeded();
+        if (mKeyRemapping.getOrDefault(fromKey, INVALID_VALUE) == toKey) {
+            return false;
+        }
+        mKeyRemapping.put(fromKey, toKey);
+        setDirty();
+        return true;
+    }
+
+    public boolean clearMappedKey(int key) {
+        loadIfNeeded();
+        if (mKeyRemapping.containsKey(key)) {
+            mKeyRemapping.remove(key);
+            setDirty();
+        }
+        return true;
+    }
+
+    public Map<Integer, Integer> getKeyRemapping() {
+        loadIfNeeded();
+        return new HashMap<>(mKeyRemapping);
+    }
+
     public boolean removeUninstalledKeyboardLayouts(Set<String> availableKeyboardLayouts) {
         boolean changed = false;
         for (InputDeviceState state : mInputDevices.values()) {
@@ -229,6 +257,7 @@
     }
 
     private void clearState() {
+        mKeyRemapping.clear();
         mInputDevices.clear();
     }
 
@@ -280,7 +309,9 @@
         XmlUtils.beginDocument(parser, "input-manager-state");
         final int outerDepth = parser.getDepth();
         while (XmlUtils.nextElementWithin(parser, outerDepth)) {
-            if (parser.getName().equals("input-devices")) {
+            if (parser.getName().equals("key-remapping")) {
+                loadKeyRemappingFromXml(parser);
+            } else if (parser.getName().equals("input-devices")) {
                 loadInputDevicesFromXml(parser);
             }
         }
@@ -307,10 +338,31 @@
         }
     }
 
+    private void loadKeyRemappingFromXml(TypedXmlPullParser parser)
+            throws IOException, XmlPullParserException {
+        final int outerDepth = parser.getDepth();
+        while (XmlUtils.nextElementWithin(parser, outerDepth)) {
+            if (parser.getName().equals("remap")) {
+                int fromKey = parser.getAttributeInt(null, "from-key");
+                int toKey = parser.getAttributeInt(null, "to-key");
+                mKeyRemapping.put(fromKey, toKey);
+            }
+        }
+    }
+
     private void saveToXml(TypedXmlSerializer serializer) throws IOException {
         serializer.startDocument(null, true);
         serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
         serializer.startTag(null, "input-manager-state");
+        serializer.startTag(null, "key-remapping");
+        for (int fromKey : mKeyRemapping.keySet()) {
+            int toKey = mKeyRemapping.get(fromKey);
+            serializer.startTag(null, "remap");
+            serializer.attributeInt(null, "from-key", fromKey);
+            serializer.attributeInt(null, "to-key", toKey);
+            serializer.endTag(null, "remap");
+        }
+        serializer.endTag(null, "key-remapping");
         serializer.startTag(null, "input-devices");
         for (Map.Entry<String, InputDeviceState> entry : mInputDevices.entrySet()) {
             final String descriptor = entry.getKey();
@@ -329,7 +381,6 @@
         private static final String[] CALIBRATION_NAME = { "x_scale",
                 "x_ymix", "x_offset", "y_xmix", "y_scale", "y_offset" };
 
-        private static final int INVALID_VALUE = -1;
         private final TouchCalibration[] mTouchCalibration = new TouchCalibration[4];
         @Nullable
         private String mCurrentKeyboardLayout;
diff --git a/services/core/jni/com_android_server_input_InputManagerService.cpp b/services/core/jni/com_android_server_input_InputManagerService.cpp
index 969056e..145e088 100644
--- a/services/core/jni/com_android_server_input_InputManagerService.cpp
+++ b/services/core/jni/com_android_server_input_InputManagerService.cpp
@@ -1578,6 +1578,12 @@
     return vec;
 }
 
+static void nativeAddKeyRemapping(JNIEnv* env, jobject nativeImplObj, jint deviceId,
+                                  jint fromKeyCode, jint toKeyCode) {
+    NativeInputManager* im = getNativeInputManager(env, nativeImplObj);
+    im->getInputManager()->getReader().addKeyRemapping(deviceId, fromKeyCode, toKeyCode);
+}
+
 static jboolean nativeHasKeys(JNIEnv* env, jobject nativeImplObj, jint deviceId, jint sourceMask,
                               jintArray keyCodes, jbooleanArray outFlags) {
     NativeInputManager* im = getNativeInputManager(env, nativeImplObj);
@@ -2360,6 +2366,7 @@
         {"getScanCodeState", "(III)I", (void*)nativeGetScanCodeState},
         {"getKeyCodeState", "(III)I", (void*)nativeGetKeyCodeState},
         {"getSwitchState", "(III)I", (void*)nativeGetSwitchState},
+        {"addKeyRemapping", "(III)V", (void*)nativeAddKeyRemapping},
         {"hasKeys", "(II[I[Z)Z", (void*)nativeHasKeys},
         {"getKeyCodeForKeyLocation", "(II)I", (void*)nativeGetKeyCodeForKeyLocation},
         {"createInputChannel", "(Ljava/lang/String;)Landroid/view/InputChannel;",
diff --git a/services/tests/servicestests/src/com/android/server/input/KeyRemapperTests.kt b/services/tests/servicestests/src/com/android/server/input/KeyRemapperTests.kt
new file mode 100644
index 0000000..c22782c
--- /dev/null
+++ b/services/tests/servicestests/src/com/android/server/input/KeyRemapperTests.kt
@@ -0,0 +1,150 @@
+/*
+ * Copyright (C) 2022 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.input
+
+import android.content.Context
+import android.content.ContextWrapper
+import android.hardware.input.IInputManager
+import android.hardware.input.InputManager
+import android.os.test.TestLooper
+import android.platform.test.annotations.Presubmit
+import android.view.InputDevice
+import android.view.KeyEvent
+import androidx.test.core.app.ApplicationProvider
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.mockito.Mock
+import org.mockito.Mockito
+import org.mockito.junit.MockitoJUnit
+import java.io.FileNotFoundException
+import java.io.FileOutputStream
+import java.io.IOException
+import java.io.InputStream
+
+private fun createKeyboard(deviceId: Int): InputDevice =
+    InputDevice.Builder()
+        .setId(deviceId)
+        .setName("Device $deviceId")
+        .setDescriptor("descriptor $deviceId")
+        .setSources(InputDevice.SOURCE_KEYBOARD)
+        .setKeyboardType(InputDevice.KEYBOARD_TYPE_ALPHABETIC)
+        .setExternal(true)
+        .build()
+
+/**
+ * Tests for {@link KeyRemapper}.
+ *
+ * Build/Install/Run:
+ * atest FrameworksServicesTests:KeyRemapperTests
+ */
+@Presubmit
+class KeyRemapperTests {
+
+    companion object {
+        const val DEVICE_ID = 1
+        val REMAPPABLE_KEYS = intArrayOf(
+            KeyEvent.KEYCODE_CTRL_LEFT, KeyEvent.KEYCODE_CTRL_RIGHT,
+            KeyEvent.KEYCODE_META_LEFT, KeyEvent.KEYCODE_META_RIGHT,
+            KeyEvent.KEYCODE_ALT_LEFT, KeyEvent.KEYCODE_ALT_RIGHT,
+            KeyEvent.KEYCODE_SHIFT_LEFT, KeyEvent.KEYCODE_SHIFT_RIGHT,
+            KeyEvent.KEYCODE_CAPS_LOCK
+        )
+    }
+
+    @get:Rule
+    val rule = MockitoJUnit.rule()!!
+
+    @Mock
+    private lateinit var iInputManager: IInputManager
+    @Mock
+    private lateinit var native: NativeInputManagerService
+    private lateinit var mKeyRemapper: KeyRemapper
+    private lateinit var context: Context
+    private lateinit var dataStore: PersistentDataStore
+    private lateinit var testLooper: TestLooper
+
+    @Before
+    fun setup() {
+        context = Mockito.spy(ContextWrapper(ApplicationProvider.getApplicationContext()))
+        dataStore = PersistentDataStore(object : PersistentDataStore.Injector() {
+            override fun openRead(): InputStream? {
+                throw FileNotFoundException()
+            }
+
+            override fun startWrite(): FileOutputStream? {
+                throw IOException()
+            }
+
+            override fun finishWrite(fos: FileOutputStream?, success: Boolean) {}
+        })
+        testLooper = TestLooper()
+        mKeyRemapper = KeyRemapper(
+            context,
+            native,
+            dataStore,
+            testLooper.looper
+        )
+        val inputManager = InputManager.resetInstance(iInputManager)
+        Mockito.`when`(context.getSystemService(Mockito.eq(Context.INPUT_SERVICE)))
+            .thenReturn(inputManager)
+        Mockito.`when`(iInputManager.inputDeviceIds).thenReturn(intArrayOf(DEVICE_ID))
+    }
+
+    @After
+    fun tearDown() {
+        InputManager.clearInstance()
+    }
+
+    @Test
+    fun testKeyRemapping() {
+        val keyboard = createKeyboard(DEVICE_ID)
+        Mockito.`when`(iInputManager.getInputDevice(DEVICE_ID)).thenReturn(keyboard)
+
+        for (i in REMAPPABLE_KEYS.indices) {
+            val fromKeyCode = REMAPPABLE_KEYS[i]
+            val toKeyCode = REMAPPABLE_KEYS[(i + 1) % REMAPPABLE_KEYS.size]
+            mKeyRemapper.remapKey(fromKeyCode, toKeyCode)
+            testLooper.dispatchNext()
+        }
+
+        val remapping = mKeyRemapper.keyRemapping
+        val expectedSize = REMAPPABLE_KEYS.size
+        assertEquals("Remapping size should be $expectedSize", expectedSize, remapping.size)
+
+        for (i in REMAPPABLE_KEYS.indices) {
+            val fromKeyCode = REMAPPABLE_KEYS[i]
+            val toKeyCode = REMAPPABLE_KEYS[(i + 1) % REMAPPABLE_KEYS.size]
+            assertEquals(
+                "Remapping should include mapping from $fromKeyCode to $toKeyCode",
+                toKeyCode,
+                remapping.getOrDefault(fromKeyCode, -1)
+            )
+        }
+
+        mKeyRemapper.clearAllKeyRemappings()
+        testLooper.dispatchNext()
+
+        assertEquals(
+            "Remapping size should be 0 after clearAllModifierKeyRemappings",
+            0,
+            mKeyRemapper.keyRemapping.size
+        )
+    }
+}
\ No newline at end of file