diff --git a/Android.bp b/Android.bp
index 9098afc..dace522 100644
--- a/Android.bp
+++ b/Android.bp
@@ -7,6 +7,8 @@
     "biometrics/fingerprint/2.1",
     "graphics/allocator/2.0",
     "graphics/allocator/2.0/default",
+    "graphics/composer/2.1",
+    "graphics/composer/2.1/default",
     "graphics/mapper/2.0",
     "graphics/mapper/2.0/default",
     "light/2.0",
diff --git a/graphics/composer/2.1/Android.bp b/graphics/composer/2.1/Android.bp
new file mode 100644
index 0000000..3c63a68
--- /dev/null
+++ b/graphics/composer/2.1/Android.bp
@@ -0,0 +1,55 @@
+// This file is autogenerated by hidl-gen. Do not edit manually.
+
+genrule {
+    name: "android.hardware.graphics.composer@2.1_genc++",
+    tool: "hidl-gen",
+    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.graphics.composer@2.1",
+    srcs: [
+        "types.hal",
+        "IComposer.hal",
+        "IComposerCallback.hal",
+    ],
+    out: [
+        "android/hardware/graphics/composer/2.1/types.cpp",
+        "android/hardware/graphics/composer/2.1/ComposerAll.cpp",
+        "android/hardware/graphics/composer/2.1/ComposerCallbackAll.cpp",
+    ],
+}
+
+genrule {
+    name: "android.hardware.graphics.composer@2.1_genc++_headers",
+    tool: "hidl-gen",
+    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.graphics.composer@2.1",
+    srcs: [
+        "types.hal",
+        "IComposer.hal",
+        "IComposerCallback.hal",
+    ],
+    out: [
+        "android/hardware/graphics/composer/2.1/types.h",
+        "android/hardware/graphics/composer/2.1/IComposer.h",
+        "android/hardware/graphics/composer/2.1/IHwComposer.h",
+        "android/hardware/graphics/composer/2.1/BnComposer.h",
+        "android/hardware/graphics/composer/2.1/BpComposer.h",
+        "android/hardware/graphics/composer/2.1/BsComposer.h",
+        "android/hardware/graphics/composer/2.1/IComposerCallback.h",
+        "android/hardware/graphics/composer/2.1/IHwComposerCallback.h",
+        "android/hardware/graphics/composer/2.1/BnComposerCallback.h",
+        "android/hardware/graphics/composer/2.1/BpComposerCallback.h",
+        "android/hardware/graphics/composer/2.1/BsComposerCallback.h",
+    ],
+}
+
+cc_library_shared {
+    name: "android.hardware.graphics.composer@2.1",
+    generated_sources: ["android.hardware.graphics.composer@2.1_genc++"],
+    generated_headers: ["android.hardware.graphics.composer@2.1_genc++_headers"],
+    export_generated_headers: ["android.hardware.graphics.composer@2.1_genc++_headers"],
+    shared_libs: [
+        "libhidl",
+        "libhwbinder",
+        "libutils",
+        "libcutils",
+        "android.hardware.graphics.allocator@2.0",
+    ],
+}
diff --git a/graphics/composer/2.1/IComposer.hal b/graphics/composer/2.1/IComposer.hal
new file mode 100644
index 0000000..7bfa22b
--- /dev/null
+++ b/graphics/composer/2.1/IComposer.hal
@@ -0,0 +1,1166 @@
+/*
+ * Copyright (C) 2016 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 android.hardware.graphics.composer@2.1;
+
+import android.hardware.graphics.allocator@2.0::PixelFormat;
+import IComposerCallback;
+
+interface IComposer {
+    /*
+     * Optional capabilities which may be supported by some devices. The
+     * particular set of supported capabilities for a given device may be
+     * retrieved using getCapabilities.
+     */
+    enum Capability : int32_t {
+        INVALID = 0,
+
+        /*
+         * Specifies that the device supports sideband stream layers, for
+         * which buffer content updates and other synchronization will not be
+         * provided through the usual validate/present cycle and must be
+         * handled by an external implementation-defined mechanism. Only
+         * changes to layer state (such as position, size, etc.) need to be
+         * performed through the validate/present cycle.
+         */
+        SIDEBAND_STREAM = 1,
+
+        /*
+         * Specifies that the device will apply a color transform even when
+         * either the client or the device has chosen that all layers should
+         * be composed by the client. This will prevent the client from
+         * applying the color transform during its composition step.
+         */
+        SKIP_CLIENT_COLOR_TRANSFORM = 2,
+    };
+
+    /* Display attributes queryable through getDisplayAttribute. */
+    enum Attribute : int32_t {
+        INVALID = 0,
+
+        /* Dimensions in pixels */
+        WIDTH = 1,
+        HEIGHT = 2,
+
+        /* Vsync period in nanoseconds */
+        VSYNC_PERIOD = 3,
+
+        /*
+         * Dots per thousand inches (DPI * 1000). Scaling by 1000 allows these
+         * numbers to be stored in an int32_t without losing too much
+         * precision. If the DPI for a configuration is unavailable or is
+         * considered unreliable, the device may return UNSUPPORTED instead.
+         */
+        DPI_X = 4,
+        DPI_Y = 5,
+    };
+
+    /* Display requests returned by getDisplayRequests. */
+    enum DisplayRequest : uint32_t {
+        /*
+         * Instructs the client to provide a new client target buffer, even if
+         * no layers are marked for client composition.
+         */
+        FLIP_CLIENT_TARGET = 1 << 0,
+
+        /*
+         * Instructs the client to write the result of client composition
+         * directly into the virtual display output buffer. If any of the
+         * layers are not marked as Composition::CLIENT or the given display
+         * is not a virtual display, this request has no effect.
+         */
+        WRITE_CLIENT_TARGET_TO_OUTPUT = 1 << 1,
+    };
+
+    /* Layer requests returned from getDisplayRequests. */
+    enum LayerRequest : uint32_t {
+        /*
+         * The client should clear its target with transparent pixels where
+         * this layer would be. The client may ignore this request if the
+         * layer must be blended.
+         */
+        CLEAR_CLIENT_TARGET = 1 << 0,
+    };
+
+    /* Power modes for use with setPowerMode. */
+    enum PowerMode : int32_t {
+        /* The display is fully off (blanked). */
+        OFF = 0,
+
+        /*
+         * These are optional low power modes. getDozeSupport may be called to
+         * determine whether a given display supports these modes.
+         */
+
+        /*
+         * The display is turned on and configured in a low power state that
+         * is suitable for presenting ambient information to the user,
+         * possibly with lower fidelity than ON, but with greater efficiency.
+         */
+        DOZE = 1,
+
+        /*
+         * The display is configured as in DOZE but may stop applying display
+         * updates from the client. This is effectively a hint to the device
+         * that drawing to the display has been suspended and that the the
+         * device should remain on in a low power state and continue
+         * displaying its current contents indefinitely until the power mode
+         * changes.
+         *
+         * This mode may also be used as a signal to enable hardware-based
+         * doze functionality. In this case, the device is free to take over
+         * the display and manage it autonomously to implement a low power
+         * always-on display.
+         */
+        DOZE_SUSPEND = 3,
+
+        /* The display is fully on. */
+        ON = 2,
+    };
+
+    /* Vsync values passed to setVsyncEnabled. */
+    enum Vsync : int32_t {
+        INVALID = 0,
+
+        /* Enable vsync. */
+        ENABLE = 1,
+
+        /* Disable vsync. */
+        DISABLE = 2,
+    };
+
+    /* Blend modes, settable per layer. */
+    enum BlendMode : int32_t {
+        INVALID = 0,
+
+        /* colorOut = colorSrc */
+        NONE = 1,
+
+        /* colorOut = colorSrc + colorDst * (1 - alphaSrc) */
+        PREMULTIPLIED = 2,
+
+        /* colorOut = colorSrc * alphaSrc + colorDst * (1 - alphaSrc) */
+        COVERAGE = 3,
+    };
+
+    /* Possible composition types for a given layer. */
+    enum Composition : int32_t {
+        INVALID = 0,
+
+        /*
+         * The client will composite this layer into the client target buffer
+         * (provided to the device through setClientTarget).
+         *
+         * The device must not request any composition type changes for layers
+         * of this type.
+         */
+        CLIENT = 1,
+
+        /*
+         * The device will handle the composition of this layer through a
+         * hardware overlay or other similar means.
+         *
+         * Upon validateDisplay, the device may request a change from this
+         * type to CLIENT.
+         */
+        DEVICE = 2,
+
+        /*
+         * The device will render this layer using the color set through
+         * setLayerColor. If this functionality is not supported on a layer
+         * that the client sets to SOLID_COLOR, the device must request that
+         * the composition type of that layer is changed to CLIENT upon the
+         * next call to validateDisplay.
+         *
+         * Upon validateDisplay, the device may request a change from this
+         * type to CLIENT.
+         */
+        SOLID_COLOR = 3,
+
+        /*
+         * Similar to DEVICE, but the position of this layer may also be set
+         * asynchronously through setCursorPosition. If this functionality is
+         * not supported on a layer that the client sets to CURSOR, the device
+         * must request that the composition type of that layer is changed to
+         * CLIENT upon the next call to validateDisplay.
+         *
+         * Upon validateDisplay, the device may request a change from this
+         * type to either DEVICE or CLIENT.  Changing to DEVICE will prevent
+         * the use of setCursorPosition but still permit the device to
+         * composite the layer.
+         */
+        CURSOR = 4,
+
+        /*
+         * The device will handle the composition of this layer, as well as
+         * its buffer updates and content synchronization. Only supported on
+         * devices which provide Capability::SIDEBAND_STREAM.
+         *
+         * Upon validateDisplay, the device may request a change from this
+         * type to either DEVICE or CLIENT, but it is unlikely that content
+         * will display correctly in these cases.
+         */
+        SIDEBAND = 5,
+    };
+
+    /* Display types returned by getDisplayType. */
+    enum DisplayType : int32_t {
+        INVALID = 0,
+
+        /*
+         * All physical displays, including both internal displays and
+         * hotpluggable external displays.
+         */
+        PHYSICAL = 1,
+
+        /* Virtual displays created by createVirtualDisplay. */
+        VIRTUAL = 2,
+    };
+
+    struct Rect {
+        int32_t left;
+        int32_t top;
+        int32_t right;
+        int32_t bottom;
+    };
+
+    struct FRect {
+        float left;
+        float top;
+        float right;
+        float bottom;
+    };
+
+    struct Color {
+        uint8_t r;
+        uint8_t g;
+        uint8_t b;
+        uint8_t a;
+    };
+
+    /*
+     * Provides a list of supported capabilities (as described in the
+     * definition of Capability above). This list must not change after
+     * initialization.
+     *
+     * @return capabilities is a list of supported capabilities.
+     */
+    getCapabilities() generates (vec<Capability> capabilities);
+
+    /*
+     * Retrieves implementation-defined debug information, which will be
+     * displayed during, for example, `dumpsys SurfaceFlinger`.
+     *
+     * @return debugInfo is a string of debug information.
+     */
+    dumpDebugInfo() generates (string debugInfo);
+
+    /*
+     * Provides a IComposerCallback object for the device to call.
+     *
+     * @param callback is the IComposerCallback object.
+     */
+    registerCallback(IComposerCallback callback);
+
+    /*
+     * Returns the maximum number of virtual displays supported by this device
+     * (which may be 0). The client will not attempt to create more than this
+     * many virtual displays on this device. This number must not change for
+     * the lifetime of the device.
+     */
+    getMaxVirtualDisplayCount() generates (uint32_t count);
+
+    /*
+     * Creates a new virtual display with the given width and height. The
+     * format passed into this function is the default format requested by the
+     * consumer of the virtual display output buffers.
+     *
+     * The display will be assumed to be on from the time the first frame is
+     * presented until the display is destroyed.
+     *
+     * @param width is the width in pixels.
+     * @param height is the height in pixels.
+     * @param formatHint is the default output buffer format selected by
+     *        the consumer.
+     * @return error is NONE upon success. Otherwise,
+     *         UNSUPPORTED when the width or height is too large for the
+     *                     device to be able to create a virtual display.
+     *         NO_RESOURCES when the device is unable to create a new virtual
+     *                      display at this time.
+     * @return display is the newly-created virtual display.
+     * @return format is the format of the buffer the device will produce.
+     */
+    createVirtualDisplay(uint32_t width,
+                         uint32_t height,
+                         PixelFormat formatHint)
+              generates (Error error,
+                         Display display,
+                         PixelFormat format);
+
+    /*
+     * Destroys a virtual display. After this call all resources consumed by
+     * this display may be freed by the device and any operations performed on
+     * this display should fail.
+     *
+     * @param display is the virtual display to destroy.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_PARAMETER when the display handle which was passed in does
+     *                       not refer to a virtual display.
+     */
+    destroyVirtualDisplay(Display display) generates (Error error);
+
+    /*
+     * Accepts the changes required by the device from the previous
+     * validateDisplay call (which may be queried using
+     * getChangedCompositionTypes) and revalidates the display. This function
+     * is equivalent to requesting the changed types from
+     * getChangedCompositionTypes, setting those types on the corresponding
+     * layers, and then calling validateDisplay again.
+     *
+     * After this call it must be valid to present this display. Calling this
+     * after validateDisplay returns 0 changes must succeed with NONE, but
+     * should have no other effect.
+     *
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         NOT_VALIDATED when validateDisplay has not been called.
+     */
+    acceptDisplayChanges(Display display) generates (Error error);
+
+    /*
+     * Creates a new layer on the given display.
+     *
+     * @param display is the display on which to create the layer.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         NO_RESOURCES when the device was unable to create a layer this
+     *                      time.
+     * @return layer is the handle of the new layer.
+     */
+    createLayer(Display display) generates (Error error, Layer layer);
+
+    /*
+     * Destroys the given layer.
+     *
+     * @param display is the display on which the layer was created.
+     * @param layer is the layer to destroy.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_LAYER when an invalid layer handle was passed in.
+     */
+    destroyLayer(Display display, Layer layer) generates (Error error);
+
+    /*
+     * Retrieves which display configuration is currently active.
+     *
+     * If no display configuration is currently active, this function must
+     * return BAD_CONFIG. It is the responsibility of the client to call
+     * setActiveConfig with a valid configuration before attempting to present
+     * anything on the display.
+     *
+     * @param display is the display to which the active config is queried.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_CONFIG when no configuration is currently active.
+     * @return config is the currently active display configuration.
+     */
+    getActiveConfig(Display display) generates (Error error, Config config);
+
+    /*
+     * Retrieves the layers for which the device requires a different
+     * composition type than had been set prior to the last call to
+     * validateDisplay. The client will either update its state with these
+     * types and call acceptDisplayChanges, or will set new types and attempt
+     * to validate the display again.
+     *
+     * The number of changed layers must be the same as the value returned in
+     * numTypes from the last call to validateDisplay.
+     *
+     * @param display is the display to query.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         NOT_VALIDATED when validateDisplay has not been called.
+     * @return layers is an array of layer handles.
+     * @return types is an array of composition types, each corresponding to
+     *         an element of layers.
+     */
+    getChangedCompositionTypes(Display display)
+                    generates (Error error,
+                               vec<Layer> layers,
+                               vec<Composition> types);
+
+    /*
+     * Returns whether a client target with the given properties can be
+     * handled by the device.
+     *
+     * This function must return true for a client target with width and
+     * height equal to the active display configuration dimensions,
+     * PixelFormat::RGBA_8888, and Dataspace::UNKNOWN. It is not required to
+     * return true for any other configuration.
+     *
+     * @param display is the display to query.
+     * @param width is the client target width in pixels.
+     * @param height is the client target height in pixels.
+     * @param format is the client target format.
+     * @param dataspace is the client target dataspace, as described in
+     *        setLayerDataspace.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         UNSUPPORTED when the given configuration is not supported.
+     */
+    getClientTargetSupport(Display display,
+                           uint32_t width,
+                           uint32_t height,
+                           PixelFormat format,
+                           Dataspace dataspace)
+                generates (Error error);
+
+    /*
+     * Returns the color modes supported on this display.
+     *
+     * All devices must support at least ColorMode::NATIVE.
+     *
+     * @param display is the display to query.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     * @return modes is an array of color modes.
+     */
+    getColorModes(Display display)
+       generates (Error error,
+                  vec<ColorMode> modes);
+
+    /*
+     * Returns a display attribute value for a particular display
+     * configuration.
+     *
+     * @param display is the display to query.
+     * @param config is the display configuration for which to return
+     *        attribute values.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_CONFIG when config does not name a valid configuration for
+     *                    this display.
+     *         BAD_PARAMETER when attribute is unrecognized.
+     *         UNSUPPORTED when attribute cannot be queried for the config.
+     * @return value is the value of the attribute.
+     */
+    getDisplayAttribute(Display display,
+                        Config config,
+                        Attribute attribute)
+             generates (Error error,
+                        int32_t value);
+
+    /*
+     * Returns handles for all of the valid display configurations on this
+     * display.
+     *
+     * @param display is the display to query.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     * @return configs is an array of configuration handles.
+     */
+    getDisplayConfigs(Display display)
+           generates (Error error,
+                      vec<Config> configs);
+
+    /*
+     * Returns a human-readable version of the display's name.
+     *
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     * @return name is the name of the display.
+     */
+    getDisplayName(Display display) generates (Error error, string name);
+
+    /*
+     * Returns the display requests and the layer requests required for the
+     * last validated configuration.
+     *
+     * Display requests provide information about how the client should handle
+     * the client target. Layer requests provide information about how the
+     * client should handle an individual layer.
+     *
+     * The number of layer requests must be equal to the value returned in
+     * numRequests from the last call to validateDisplay.
+     *
+     * @param display is the display to query.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         NOT_VALIDATED when validateDisplay has not been called.
+     * @return displayRequestMask is the display requests for the current
+     *         validated state.
+     * @return layers is an array of layers which all have at least one
+     *         request.
+     * @return layerRequestMasks is the requests corresponding to each element
+     *         of layers.
+     */
+    getDisplayRequests(Display display)
+            generates (Error error,
+                       uint32_t displayRequestMask,
+                       vec<Layer> layers,
+                       vec<uint32_t> layerRequestMasks);
+
+    /*
+     * Returns whether the given display is a physical or virtual display.
+     *
+     * @param display is the display to query.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     * @return type is the type of the display.
+     */
+    getDisplayType(Display display) generates (Error error, DisplayType type);
+
+    /*
+     * Returns whether the given display supports PowerMode::DOZE and
+     * PowerMode::DOZE_SUSPEND. DOZE_SUSPEND may not provide any benefit over
+     * DOZE (see the definition of PowerMode for more information), but if
+     * both DOZE and DOZE_SUSPEND are no different from PowerMode::ON, the
+     * device should not claim support.
+     *
+     * @param display is the display to query.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     * @return support is true only when the display supports doze modes.
+     */
+    getDozeSupport(Display display) generates (Error error, bool support);
+
+    /*
+     * Returns the high dynamic range (HDR) capabilities of the given display,
+     * which are invariant with regard to the active configuration.
+     *
+     * Displays which are not HDR-capable must return no types.
+     *
+     * @param display is the display to query.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     * @return types is an array of HDR types, may have 0 elements if the
+     *         display is not HDR-capable.
+     * @return maxLuminance is the desired content maximum luminance for this
+     *         display in cd/m^2.
+     * @return maxAverageLuminance - the desired content maximum frame-average
+     *         luminance for this display in cd/m^2.
+     * @return minLuminance is the desired content minimum luminance for this
+     *         display in cd/m^2.
+     */
+    getHdrCapabilities(Display display)
+            generates (Error error,
+                       vec<Hdr> types,
+                       float maxLuminance,
+                       float maxAverageLuminance,
+                       float minLuminance);
+
+    /*
+     * Retrieves the release fences for device layers on this display which
+     * will receive new buffer contents this frame.
+     *
+     * A release fence is a file descriptor referring to a sync fence object
+     * which will be signaled after the device has finished reading from the
+     * buffer presented in the prior frame. This indicates that it is safe to
+     * start writing to the buffer again. If a given layer's fence is not
+     * returned from this function, it will be assumed that the buffer
+     * presented on the previous frame is ready to be written.
+     *
+     * The fences returned by this function should be unique for each layer
+     * (even if they point to the same underlying sync object).
+     *
+     * @param display is the display to query.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     * @return layers is an array of layer handles.
+     * @return fences is handle that contains an array of sync fence file
+     *         descriptors as described above, each corresponding to an
+     *         element of layers.
+     */
+    getReleaseFences(Display display)
+          generates (Error error,
+                     vec<Layer> layers,
+                     handle releaseFences);
+
+    /*
+     * Presents the current display contents on the screen (or in the case of
+     * virtual displays, into the output buffer).
+     *
+     * Prior to calling this function, the display must be successfully
+     * validated with validateDisplay. Note that setLayerBuffer and
+     * setLayerSurfaceDamage specifically do not count as layer state, so if
+     * there are no other changes to the layer state (or to the buffer's
+     * properties as described in setLayerBuffer), then it is safe to call
+     * this function without first validating the display.
+     *
+     * If this call succeeds, presentFence will be populated with a file
+     * descriptor referring to a present sync fence object. For physical
+     * displays, this fence will be signaled at the vsync when the result of
+     * composition of this frame starts to appear (for video-mode panels) or
+     * starts to transfer to panel memory (for command-mode panels). For
+     * virtual displays, this fence will be signaled when writes to the output
+     * buffer have completed and it is safe to read from it.
+     *
+     * @param display is the display to present.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         NO_RESOURCES when no valid output buffer has been set for a
+     *                      virtual display.
+     *         NOT_VALIDATED when validateDisplay has not successfully been
+     *                       called for this display.
+     * @return presentFence is a sync fence file descriptor as described
+     *         above.
+     */
+    presentDisplay(Display display)
+        generates (Error error,
+                   handle presentFence);
+
+    /*
+     * Sets the active configuration for this display. Upon returning, the
+     * given display configuration should be active and remain so until either
+     * this function is called again or the display is disconnected.
+     *
+     * @param display is the display to which the active config is set.
+     * @param config is the new display configuration.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_CONFIG when the configuration handle passed in is not valid
+     *                    for this display.
+     */
+    setActiveConfig(Display display, Config config) generates (Error error);
+
+    /*
+     * Sets the buffer handle which will receive the output of client
+     * composition.  Layers marked as Composition::CLIENT will be composited
+     * into this buffer prior to the call to presentDisplay, and layers not
+     * marked as Composition::CLIENT should be composited with this buffer by
+     * the device.
+     *
+     * The buffer handle provided may be empty if no layers are being
+     * composited by the client. This must not result in an error (unless an
+     * invalid display handle is also provided).
+     *
+     * Also provides a file descriptor referring to an acquire sync fence
+     * object, which will be signaled when it is safe to read from the client
+     * target buffer.  If it is already safe to read from this buffer, an
+     * empty handle may be passed instead.
+     *
+     * For more about dataspaces, see setLayerDataspace.
+     *
+     * The damage parameter describes a surface damage region as defined in
+     * the description of setLayerSurfaceDamage.
+     *
+     * Will be called before presentDisplay if any of the layers are marked as
+     * Composition::CLIENT. If no layers are so marked, then it is not
+     * necessary to call this function. It is not necessary to call
+     * validateDisplay after changing the target through this function.
+     *
+     * @param display is the display to which the client target is set.
+     * @param target is the new target buffer.
+     * @param acquireFence is a sync fence file descriptor as described above.
+     * @param dataspace is the dataspace of the buffer, as described in
+     *        setLayerDataspace.
+     * @param damage is the surface damage region.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_PARAMETER when the new target handle was invalid.
+     */
+    setClientTarget(Display display,
+                    handle target,
+                    handle acquireFence,
+                    Dataspace dataspace,
+                    vec<Rect> damage)
+         generates (Error error);
+
+    /*
+     * Sets the color mode of the given display.
+     *
+     * Upon returning from this function, the color mode change must have
+     * fully taken effect.
+     *
+     * All devices must support at least ColorMode::NATIVE, and displays are
+     * assumed to be in this mode upon hotplug.
+     *
+     * @param display is the display to which the color mode is set.
+     * @param mode is the mode to set to.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_PARAMETER when mode is not a valid color mode.
+     *         UNSUPPORTED when mode is not supported on this display.
+     */
+    setColorMode(Display display, ColorMode mode) generates (Error error);
+
+    /*
+     * Sets a color transform which will be applied after composition.
+     *
+     * If hint is not ColorTransform::ARBITRARY, then the device may use the
+     * hint to apply the desired color transform instead of using the color
+     * matrix directly.
+     *
+     * If the device is not capable of either using the hint or the matrix to
+     * apply the desired color transform, it should force all layers to client
+     * composition during validateDisplay.
+     *
+     * If Capability::SKIP_CLIENT_COLOR_TRANSFORM is present, then the client
+     * will never apply the color transform during client composition, even if
+     * all layers are being composed by the client.
+     *
+     * The matrix provided is an affine color transformation of the following
+     * form:
+     *
+     * |r.r r.g r.b 0|
+     * |g.r g.g g.b 0|
+     * |b.r b.g b.b 0|
+     * |Tr  Tg  Tb  1|
+     *
+     * This matrix will be provided in row-major form:
+     *
+     * {r.r, r.g, r.b, 0, g.r, ...}.
+     *
+     * Given a matrix of this form and an input color [R_in, G_in, B_in], the
+     * output color [R_out, G_out, B_out] will be:
+     *
+     * R_out = R_in * r.r + G_in * g.r + B_in * b.r + Tr
+     * G_out = R_in * r.g + G_in * g.g + B_in * b.g + Tg
+     * B_out = R_in * r.b + G_in * g.b + B_in * b.b + Tb
+     *
+     * @param display is the display to which the color transform is set.
+     * @param matrix is a 4x4 transform matrix (16 floats) as described above.
+     * @param hint is a hint value which may be used instead of the given
+     *        matrix unless it is ColorTransform::ARBITRARY.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_PARAMETER when hint is not a valid color transform hint.
+     */
+    setColorTransform(Display display,
+                      vec<float> matrix,
+                      ColorTransform hint)
+           generates (Error error);
+
+    /*
+     * Sets the output buffer for a virtual display. That is, the buffer to
+     * which the composition result will be written.
+     *
+     * Also provides a file descriptor referring to a release sync fence
+     * object, which will be signaled when it is safe to write to the output
+     * buffer. If it is already safe to write to the output buffer, an empty
+     * handle may be passed instead.
+     *
+     * Must be called at least once before presentDisplay, but does not have
+     * any interaction with layer state or display validation.
+     *
+     * @param display is the virtual display to which the output buffer is
+     *        set.
+     * @param buffer is the new output buffer.
+     * @param releaseFence is a sync fence file descriptor as described above.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_PARAMETER when the new output buffer handle was invalid.
+     *         UNSUPPORTED when display does not refer to a virtual display.
+     */
+    setOutputBuffer(Display display,
+                    handle buffer,
+                    handle releaseFence)
+         generates (Error error);
+
+    /*
+     * Sets the power mode of the given display. The transition must be
+     * complete when this function returns. It is valid to call this function
+     * multiple times with the same power mode.
+     *
+     * All displays must support PowerMode::ON and PowerMode::OFF.  Whether a
+     * display supports PowerMode::DOZE or PowerMode::DOZE_SUSPEND may be
+     * queried using getDozeSupport.
+     *
+     * @param display is the display to which the power mode is set.
+     * @param mode is the new power mode.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_PARAMETER when mode was not a valid power mode.
+     *         UNSUPPORTED when mode is not supported on this display.
+     */
+    setPowerMode(Display display, PowerMode mode) generates (Error error);
+
+    /*
+     * Enables or disables the vsync signal for the given display. Virtual
+     * displays never generate vsync callbacks, and any attempt to enable
+     * vsync for a virtual display though this function must succeed and have
+     * no other effect.
+     *
+     * @param display is the display to which the vsync mode is set.
+     * @param enabled indicates whether to enable or disable vsync
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_PARAMETER when enabled was an invalid value.
+     */
+    setVsyncEnabled(Display display, Vsync enabled) generates (Error error);
+
+    /*
+     * Instructs the device to inspect all of the layer state and determine if
+     * there are any composition type changes necessary before presenting the
+     * display. Permitted changes are described in the definition of
+     * Composition above.
+     *
+     * Also returns the number of layer requests required by the given layer
+     * configuration.
+     *
+     * @param display is the display to validate.
+     * @return error is NONE or HAS_CHANGES upon success.
+     *         NONE when no changes are necessary and it is safe to present
+     *              the display using the current layer state.
+     *         HAS_CHANGES when composition type changes are needed.
+     *         Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     * @return numTypes is the number of composition type changes required by
+     *         the device; if greater than 0, the client must either set and
+     *         validate new types, or call acceptDisplayChanges to accept the
+     *         changes returned by getChangedCompositionTypes. It must be the
+     *         same as the number of changes returned by
+     *         getChangedCompositionTypes (see the declaration of that
+     *         function for more information).
+     * @return numRequests is the number of layer requests required by this
+     *         layer configuration. It must be equal to the number of layer
+     *         requests returned by getDisplayRequests (see the declaration of
+     *         that function for more information).
+     */
+    validateDisplay(Display display)
+         generates (Error error,
+                    uint32_t numTypes,
+                    uint32_t numRequests);
+
+    /*
+     * Layer Functions
+     *
+     * These are functions which operate on layers, but which do not modify
+     * state that must be validated before use. See also 'Layer State
+     * Functions' below.
+     */
+
+    /*
+     * Asynchonously sets the position of a cursor layer.
+     *
+     * Prior to validateDisplay, a layer may be marked as Composition::CURSOR.
+     * If validation succeeds (i.e., the device does not request a composition
+     * change for that layer), then once a buffer has been set for the layer
+     * and it has been presented, its position may be set by this function at
+     * any time between presentDisplay and any subsequent validateDisplay
+     * calls for this display.
+     *
+     * Once validateDisplay is called, this function will not be called again
+     * until the validate/present sequence is completed.
+     *
+     * May be called from any thread so long as it is not interleaved with the
+     * validate/present sequence as described above.
+     *
+     * @param display is the display on which the layer was created.
+     * @param layer is the layer to which the position is set.
+     * @param x is the new x coordinate (in pixels from the left of the
+     *        screen).
+     * @param y is the new y coordinate (in pixels from the top of the
+     *        screen).
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_LAYER when the layer is invalid or is not currently marked
+     *                   as Composition::CURSOR.
+     *         NOT_VALIDATED when the device is currently in the middle of the
+     *                       validate/present sequence.
+     */
+    setCursorPosition(Display display,
+                      Layer layer,
+                      int32_t x,
+                      int32_t y)
+           generates (Error error);
+
+    /*
+     * Sets the buffer handle to be displayed for this layer. If the buffer
+     * properties set at allocation time (width, height, format, and usage)
+     * have not changed since the previous frame, it is not necessary to call
+     * validateDisplay before calling presentDisplay unless new state needs to
+     * be validated in the interim.
+     *
+     * Also provides a file descriptor referring to an acquire sync fence
+     * object, which will be signaled when it is safe to read from the given
+     * buffer. If it is already safe to read from the buffer, an empty handle
+     * may be passed instead.
+     *
+     * This function must return NONE and have no other effect if called for a
+     * layer with a composition type of Composition::SOLID_COLOR (because it
+     * has no buffer) or Composition::SIDEBAND or Composition::CLIENT (because
+     * synchronization and buffer updates for these layers are handled
+     * elsewhere).
+     *
+     * @param display is the display on which the layer was created.
+     * @param layer is the layer to which the buffer is set.
+     * @param buffer is the buffer handle to set.
+     * @param acquireFence is a sync fence file descriptor as described above.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_LAYER when an invalid layer handle was passed in.
+     *         BAD_PARAMETER when the buffer handle passed in was invalid.
+     */
+    setLayerBuffer(Display display,
+                   Layer layer,
+                   handle buffer,
+                   handle acquireFence)
+        generates (Error error);
+
+    /*
+     * Provides the region of the source buffer which has been modified since
+     * the last frame. This region does not need to be validated before
+     * calling presentDisplay.
+     *
+     * Once set through this function, the damage region remains the same
+     * until a subsequent call to this function.
+     *
+     * If damage is non-empty, then it may be assumed that any portion of the
+     * source buffer not covered by one of the rects has not been modified
+     * this frame. If damage is empty, then the whole source buffer must be
+     * treated as if it has been modified.
+     *
+     * If the layer's contents are not modified relative to the prior frame,
+     * damage will contain exactly one empty rect([0, 0, 0, 0]).
+     *
+     * The damage rects are relative to the pre-transformed buffer, and their
+     * origin is the top-left corner. They will not exceed the dimensions of
+     * the latched buffer.
+     *
+     * @param display is the display on which the layer was created.
+     * @param layer is the layer to which the damage region is set.
+     * @param damage is the new surface damage region.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_LAYER when an invalid layer handle was passed in.
+     */
+    setLayerSurfaceDamage(Display display,
+                          Layer layer,
+                          vec<Rect> damage)
+               generates (Error error);
+
+    /*
+     * Layer State Functions
+     *
+     * These functions modify the state of a given layer. They do not take
+     * effect until the display configuration is successfully validated with
+     * validateDisplay and the display contents are presented with
+     * presentDisplay.
+     */
+
+    /*
+     * Sets the blend mode of the given layer.
+     *
+     * @param display is the display on which the layer was created.
+     * @param layer is the layer to which the blend mode is set.
+     * @param mode is the new blend mode.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_LAYER when an invalid layer handle was passed in.
+     *         BAD_PARAMETER when an invalid blend mode was passed in.
+     */
+    setLayerBlendMode(Display display,
+                      Layer layer,
+                      BlendMode mode)
+           generates (Error error);
+
+    /*
+     * Sets the color of the given layer. If the composition type of the layer
+     * is not Composition::SOLID_COLOR, this call must succeed and have no
+     * other effect.
+     *
+     * @param display is the display on which the layer was created.
+     * @param layer is the layer to which the blend mode is set.
+     * @param color is the new color.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_LAYER when an invalid layer handle was passed in.
+     */
+    setLayerColor(Display display,
+                  Layer layer,
+                  Color color)
+       generates (Error error);
+
+    /*
+     * Sets the desired composition type of the given layer. During
+     * validateDisplay, the device may request changes to the composition
+     * types of any of the layers as described in the definition of
+     * Composition above.
+     *
+     * @param display is the display on which the layer was created.
+     * @param layer is the layer to which the blend mode is set.
+     * @param type is the new composition type.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_LAYER when an invalid layer handle was passed in.
+     *         BAD_PARAMETER when an invalid composition type was passed in.
+     *         UNSUPPORTED when a valid composition type was passed in, but it
+     *                     is not supported by this device.
+     */
+    setLayerCompositionType(Display display,
+                            Layer layer,
+                            Composition type)
+                 generates (Error error);
+
+    /*
+     * Sets the dataspace that the current buffer on this layer is in.
+     *
+     * The dataspace provides more information about how to interpret the
+     * buffer contents, such as the encoding standard and color transform.
+     *
+     * See the values of Dataspace for more information.
+     *
+     * @param display is the display on which the layer was created.
+     * @param layer is the layer to which the dataspace is set.
+     * @param dataspace is the new dataspace.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_LAYER when an invalid layer handle was passed in.
+     */
+    setLayerDataspace(Display display,
+                      Layer layer,
+                      Dataspace dataspace)
+           generates (Error error);
+
+    /*
+     * Sets the display frame (the portion of the display covered by a layer)
+     * of the given layer. This frame will not exceed the display dimensions.
+     *
+     * @param display is the display on which the layer was created.
+     * @param layer is the layer to which the frame is set.
+     * @param frame is the new display frame.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_LAYER when an invalid layer handle was passed in.
+     */
+    setLayerDisplayFrame(Display display,
+                         Layer layer,
+                         Rect frame)
+              generates (Error error);
+
+    /*
+     * Sets an alpha value (a floating point value in the range [0.0, 1.0])
+     * which will be applied to the whole layer. It can be conceptualized as a
+     * preprocessing step which applies the following function:
+     *   if (blendMode == BlendMode::PREMULTIPLIED)
+     *       out.rgb = in.rgb * planeAlpha
+     *   out.a = in.a * planeAlpha
+     *
+     * If the device does not support this operation on a layer which is
+     * marked Composition::DEVICE, it must request a composition type change
+     * to Composition::CLIENT upon the next validateDisplay call.
+     *
+     * @param display is the display on which the layer was created.
+     * @param layer is the layer to which the plane alpha is set.
+     * @param alpha is the plane alpha value to apply.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_LAYER when an invalid layer handle was passed in.
+     */
+    setLayerPlaneAlpha(Display display,
+                       Layer layer,
+                       float alpha)
+            generates (Error error);
+
+    /*
+     * Sets the sideband stream for this layer. If the composition type of the
+     * given layer is not Composition::SIDEBAND, this call must succeed and
+     * have no other effect.
+     *
+     * @param display is the display on which the layer was created.
+     * @param layer is the layer to which the sideband stream is set.
+     * @param stream is the new sideband stream.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_LAYER when an invalid layer handle was passed in.
+     *         BAD_PARAMETER when an invalid sideband stream was passed in.
+     */
+    setLayerSidebandStream(Display display,
+                           Layer layer,
+                           handle stream)
+                generates (Error error);
+
+    /*
+     * Sets the source crop (the portion of the source buffer which will fill
+     * the display frame) of the given layer. This crop rectangle will not
+     * exceed the dimensions of the latched buffer.
+     *
+     * If the device is not capable of supporting a true float source crop
+     * (i.e., it will truncate or round the floats to integers), it should set
+     * this layer to Composition::CLIENT when crop is non-integral for the
+     * most accurate rendering.
+     *
+     * If the device cannot support float source crops, but still wants to
+     * handle the layer, it should use the following code (or similar) to
+     * convert to an integer crop:
+     *   intCrop.left = (int) ceilf(crop.left);
+     *   intCrop.top = (int) ceilf(crop.top);
+     *   intCrop.right = (int) floorf(crop.right);
+     *   intCrop.bottom = (int) floorf(crop.bottom);
+     *
+     * @param display is the display on which the layer was created.
+     * @param layer is the layer to which the source crop is set.
+     * @param crop is the new source crop.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_LAYER when an invalid layer handle was passed in.
+     */
+    setLayerSourceCrop(Display display,
+                       Layer layer,
+                       FRect crop)
+            generates (Error error);
+
+    /*
+     * Sets the transform (rotation/flip) of the given layer.
+     *
+     * @param display is the display on which the layer was created.
+     * @param layer is the layer to which the transform is set.
+     * @param transform is the new transform.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_LAYER when an invalid layer handle was passed in.
+     *         BAD_PARAMETER when an invalid transform was passed in.
+     */
+    setLayerTransform(Display display,
+                      Layer layer,
+                      Transform transform)
+           generates (Error error);
+
+    /*
+     * Specifies the portion of the layer that is visible, including portions
+     * under translucent areas of other layers. The region is in screen space,
+     * and will not exceed the dimensions of the screen.
+     *
+     * @param display is the display on which the layer was created.
+     * @param layer is the layer to which the visible region is set.
+     * @param visible is the new visible region, in screen space.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_LAYER when an invalid layer handle was passed in.
+     */
+    setLayerVisibleRegion(Display display,
+                          Layer layer,
+                          vec<Rect> visible)
+               generates (Error error);
+
+    /*
+     * Sets the desired Z order (height) of the given layer. A layer with a
+     * greater Z value occludes a layer with a lesser Z value.
+     *
+     * @param display is the display on which the layer was created.
+     * @param layer is the layer to which the Z order is set.
+     * @param z is the new Z order.
+     * @return error is NONE upon success. Otherwise,
+     *         BAD_DISPLAY when an invalid display handle was passed in.
+     *         BAD_LAYER when an invalid layer handle was passed in.
+     */
+    setLayerZOrder(Display display,
+                   Layer layer,
+                   uint32_t z)
+        generates (Error error);
+};
diff --git a/graphics/composer/2.1/IComposerCallback.hal b/graphics/composer/2.1/IComposerCallback.hal
new file mode 100644
index 0000000..a8ca168
--- /dev/null
+++ b/graphics/composer/2.1/IComposerCallback.hal
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2016 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 android.hardware.graphics.composer@2.1;
+
+interface IComposerCallback {
+    enum Connection : int32_t {
+        INVALID = 0,
+
+        /* The display has been connected */
+        CONNECTED = 1,
+        /* The display has been disconnected */
+        DISCONNECTED = 2,
+    };
+
+    /*
+     * Notifies the client that the given display has either been connected or
+     * disconnected. Every active display (even a built-in physical display)
+     * must trigger at least one hotplug notification, even if it only occurs
+     * immediately after callback registration.
+     *
+     * Displays which have been connected are assumed to be in PowerMode::OFF,
+     * and the onVsync callback should not be called for a display until vsync
+     * has been enabled with setVsyncEnabled.
+     *
+     * The client may call back into the device while the callback is in
+     * progress. The device must serialize calls to this callback such that
+     * only one thread is calling it at a time.
+     *
+     * @param display is the display that triggers the hotplug event.
+     * @param connected indicates whether the display is connected or
+     *        disconnected.
+     */
+    onHotplug(Display display, Connection connected);
+
+    /*
+     * Notifies the client to trigger a screen refresh. This forces all layer
+     * state for this display to be resent, and the display to be validated
+     * and presented, even if there have been no changes.
+
+     * This refresh will occur some time after the callback is initiated, but
+     * not necessarily before it returns.  It is safe to trigger this callback
+     * from other functions which call into the device.
+     *
+     * @param display is the display to refresh.
+     */
+    oneway onRefresh(Display display);
+
+    /*
+     * Notifies the client that a vsync event has occurred. This callback must
+     * only be triggered when vsync is enabled for this display (through
+     * setVsyncEnabled).
+     *
+     * @param display is the display which has received a vsync event
+     * @param timestamp is the CLOCK_MONOTONIC time at which the vsync event
+     *        occurred, in nanoseconds.
+     */
+    oneway onVsync(Display display, int64_t timestamp);
+};
diff --git a/graphics/composer/2.1/default/Android.bp b/graphics/composer/2.1/default/Android.bp
new file mode 100644
index 0000000..f91c9a2
--- /dev/null
+++ b/graphics/composer/2.1/default/Android.bp
@@ -0,0 +1,16 @@
+cc_library_shared {
+    name: "android.hardware.graphics.composer@2.1-impl",
+    relative_install_path: "hw",
+    srcs: ["Hwc.cpp"],
+    shared_libs: [
+        "android.hardware.graphics.allocator@2.0",
+        "android.hardware.graphics.composer@2.1",
+        "libbase",
+        "libcutils",
+        "libhardware",
+        "libhidl",
+        "libhwbinder",
+        "liblog",
+        "libutils",
+    ],
+}
diff --git a/graphics/composer/2.1/default/Hwc.cpp b/graphics/composer/2.1/default/Hwc.cpp
new file mode 100644
index 0000000..09c62f0
--- /dev/null
+++ b/graphics/composer/2.1/default/Hwc.cpp
@@ -0,0 +1,1292 @@
+/*
+ * Copyright 2016 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.
+ */
+
+#define LOG_TAG "HwcPassthrough"
+
+#include <mutex>
+#include <type_traits>
+#include <unordered_map>
+#include <unordered_set>
+#include <utility>
+#include <vector>
+
+#include <hardware/gralloc.h>
+#include <hardware/gralloc1.h>
+#include <hardware/hwcomposer2.h>
+#include <log/log.h>
+
+#include "Hwc.h"
+
+namespace android {
+namespace hardware {
+namespace graphics {
+namespace composer {
+namespace V2_1 {
+namespace implementation {
+
+using android::hardware::graphics::allocator::V2_0::PixelFormat;
+
+namespace {
+
+class HandleImporter {
+public:
+    HandleImporter() : mInitialized(false) {}
+
+    bool initialize()
+    {
+        // allow only one client
+        if (mInitialized) {
+            return false;
+        }
+
+        if (!openGralloc()) {
+            return false;
+        }
+
+        mInitialized = true;
+        return true;
+    }
+
+    void cleanup()
+    {
+        if (!mInitialized) {
+            return;
+        }
+
+        closeGralloc();
+        mInitialized = false;
+    }
+
+    // In IComposer, any buffer_handle_t is owned by the caller and we need to
+    // make a clone for hwcomposer2.  We also need to translate empty handle
+    // to nullptr.  This function does that, in-place.
+    bool importBuffer(buffer_handle_t& handle)
+    {
+        if (!handle->numFds && !handle->numInts) {
+            handle = nullptr;
+            return true;
+        }
+
+        buffer_handle_t clone = cloneBuffer(handle);
+        if (!clone) {
+            return false;
+        }
+
+        handle = clone;
+        return true;
+    }
+
+    void freeBuffer(buffer_handle_t handle)
+    {
+        if (!handle) {
+            return;
+        }
+
+        releaseBuffer(handle);
+    }
+
+    bool importFence(const native_handle_t* handle, int& fd)
+    {
+        if (handle->numFds == 0) {
+            fd = -1;
+        } else if (handle->numFds == 1) {
+            fd = dup(handle->data[0]);
+            if (fd < 0) {
+                ALOGE("failed to dup fence fd %d", handle->data[0]);
+                return false;
+            }
+        } else {
+            ALOGE("invalid fence handle with %d file descriptors",
+                    handle->numFds);
+            return false;
+        }
+
+        return true;
+    }
+
+    void closeFence(int fd)
+    {
+        if (fd >= 0) {
+            close(fd);
+        }
+    }
+
+private:
+    bool mInitialized;
+
+    // Some existing gralloc drivers do not support retaining more than once,
+    // when we are in passthrough mode.
+#ifdef BINDERIZED
+    bool openGralloc()
+    {
+        const hw_module_t* module;
+        int err = hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module);
+        if (err) {
+            ALOGE("failed to get gralloc module");
+            return false;
+        }
+
+        uint8_t major = (module->module_api_version >> 8) & 0xff;
+        if (major > 1) {
+            ALOGE("unknown gralloc module major version %d", major);
+            return false;
+        }
+
+        if (major == 1) {
+            err = gralloc1_open(module, &mDevice);
+            if (err) {
+                ALOGE("failed to open gralloc1 device");
+                return false;
+            }
+
+            mRetain = reinterpret_cast<GRALLOC1_PFN_RETAIN>(
+                    mDevice->getFunction(mDevice, GRALLOC1_FUNCTION_RETAIN));
+            mRelease = reinterpret_cast<GRALLOC1_PFN_RELEASE>(
+                    mDevice->getFunction(mDevice, GRALLOC1_FUNCTION_RELEASE));
+            if (!mRetain || !mRelease) {
+                ALOGE("invalid gralloc1 device");
+                gralloc1_close(mDevice);
+                return false;
+            }
+        } else {
+            mModule = reinterpret_cast<const gralloc_module_t*>(module);
+        }
+
+        return true;
+    }
+
+    void closeGralloc()
+    {
+        if (mDevice) {
+            gralloc1_close(mDevice);
+        }
+    }
+
+    buffer_handle_t cloneBuffer(buffer_handle_t handle)
+    {
+        native_handle_t* clone = native_handle_clone(handle);
+        if (!clone) {
+            ALOGE("failed to clone buffer %p", handle);
+            return nullptr;
+        }
+
+        bool err;
+        if (mDevice) {
+            err = (mRetain(mDevice, clone) != GRALLOC1_ERROR_NONE);
+        } else {
+            err = (mModule->registerBuffer(mModule, clone) != 0);
+        }
+
+        if (err) {
+            ALOGE("failed to retain/register buffer %p", clone);
+            native_handle_close(clone);
+            native_handle_delete(clone);
+            return nullptr;
+        }
+
+        return clone;
+    }
+
+    void releaseBuffer(buffer_handle_t handle)
+    {
+        if (mDevice) {
+            mRelease(mDevice, handle);
+        } else {
+            mModule->unregisterBuffer(mModule, handle);
+            native_handle_close(handle);
+            native_handle_delete(const_cast<native_handle_t*>(handle));
+        }
+    }
+
+    // gralloc1
+    gralloc1_device_t* mDevice;
+    GRALLOC1_PFN_RETAIN mRetain;
+    GRALLOC1_PFN_RELEASE mRelease;
+
+    // gralloc0
+    const gralloc_module_t* mModule;
+#else
+    bool openGralloc() { return true; }
+    void closeGralloc() {}
+    buffer_handle_t cloneBuffer(buffer_handle_t handle) { return handle; }
+    void releaseBuffer(buffer_handle_t) {}
+#endif
+};
+
+HandleImporter sHandleImporter;
+
+class BufferClone {
+public:
+    BufferClone() : mHandle(nullptr) {}
+
+    BufferClone(BufferClone&& other)
+    {
+        mHandle = other.mHandle;
+        other.mHandle = nullptr;
+    }
+
+    BufferClone(const BufferClone& other) = delete;
+    BufferClone& operator=(const BufferClone& other) = delete;
+
+    BufferClone& operator=(buffer_handle_t handle)
+    {
+        clear();
+        mHandle = handle;
+        return *this;
+    }
+
+    ~BufferClone()
+    {
+        clear();
+    }
+
+private:
+    void clear()
+    {
+        if (mHandle) {
+            sHandleImporter.freeBuffer(mHandle);
+        }
+    }
+
+    buffer_handle_t mHandle;
+};
+
+} // anonymous namespace
+
+class HwcHal : public IComposer {
+public:
+    HwcHal(const hw_module_t* module);
+    virtual ~HwcHal();
+
+    // IComposer interface
+    Return<void> getCapabilities(getCapabilities_cb hidl_cb) override;
+    Return<void> dumpDebugInfo(dumpDebugInfo_cb hidl_cb) override;
+    Return<void> registerCallback(const sp<IComposerCallback>& callback) override;
+    Return<uint32_t> getMaxVirtualDisplayCount() override;
+    Return<void> createVirtualDisplay(uint32_t width, uint32_t height,
+            PixelFormat formatHint, createVirtualDisplay_cb hidl_cb) override;
+    Return<Error> destroyVirtualDisplay(Display display) override;
+    Return<Error> acceptDisplayChanges(Display display) override;
+    Return<void> createLayer(Display display,
+            createLayer_cb hidl_cb) override;
+    Return<Error> destroyLayer(Display display, Layer layer) override;
+    Return<void> getActiveConfig(Display display,
+            getActiveConfig_cb hidl_cb) override;
+    Return<void> getChangedCompositionTypes(Display display,
+            getChangedCompositionTypes_cb hidl_cb) override;
+    Return<Error> getClientTargetSupport(Display display,
+            uint32_t width, uint32_t height,
+            PixelFormat format, Dataspace dataspace) override;
+    Return<void> getColorModes(Display display,
+            getColorModes_cb hidl_cb) override;
+    Return<void> getDisplayAttribute(Display display,
+            Config config, Attribute attribute,
+            getDisplayAttribute_cb hidl_cb) override;
+    Return<void> getDisplayConfigs(Display display,
+            getDisplayConfigs_cb hidl_cb) override;
+    Return<void> getDisplayName(Display display,
+            getDisplayName_cb hidl_cb) override;
+    Return<void> getDisplayRequests(Display display,
+            getDisplayRequests_cb hidl_cb) override;
+    Return<void> getDisplayType(Display display,
+            getDisplayType_cb hidl_cb) override;
+    Return<void> getDozeSupport(Display display,
+            getDozeSupport_cb hidl_cb) override;
+    Return<void> getHdrCapabilities(Display display,
+            getHdrCapabilities_cb hidl_cb) override;
+    Return<void> getReleaseFences(Display display,
+            getReleaseFences_cb hidl_cb) override;
+    Return<void> presentDisplay(Display display,
+            presentDisplay_cb hidl_cb) override;
+    Return<Error> setActiveConfig(Display display, Config config) override;
+    Return<Error> setClientTarget(Display display,
+            const native_handle_t* target,
+            const native_handle_t* acquireFence,
+            Dataspace dataspace, const hidl_vec<Rect>& damage) override;
+    Return<Error> setColorMode(Display display, ColorMode mode) override;
+    Return<Error> setColorTransform(Display display,
+            const hidl_vec<float>& matrix, ColorTransform hint) override;
+    Return<Error> setOutputBuffer(Display display,
+            const native_handle_t* buffer,
+            const native_handle_t* releaseFence) override;
+    Return<Error> setPowerMode(Display display, PowerMode mode) override;
+    Return<Error> setVsyncEnabled(Display display, Vsync enabled) override;
+    Return<void> validateDisplay(Display display,
+            validateDisplay_cb hidl_cb) override;
+    Return<Error> setCursorPosition(Display display,
+            Layer layer, int32_t x, int32_t y) override;
+    Return<Error> setLayerBuffer(Display display,
+            Layer layer, const native_handle_t* buffer,
+            const native_handle_t* acquireFence) override;
+    Return<Error> setLayerSurfaceDamage(Display display,
+            Layer layer, const hidl_vec<Rect>& damage) override;
+    Return<Error> setLayerBlendMode(Display display,
+            Layer layer, BlendMode mode) override;
+    Return<Error> setLayerColor(Display display,
+            Layer layer, const Color& color) override;
+    Return<Error> setLayerCompositionType(Display display,
+            Layer layer, Composition type) override;
+    Return<Error> setLayerDataspace(Display display,
+            Layer layer, Dataspace dataspace) override;
+    Return<Error> setLayerDisplayFrame(Display display,
+            Layer layer, const Rect& frame) override;
+    Return<Error> setLayerPlaneAlpha(Display display,
+            Layer layer, float alpha) override;
+    Return<Error> setLayerSidebandStream(Display display,
+            Layer layer, const native_handle_t* stream) override;
+    Return<Error> setLayerSourceCrop(Display display,
+            Layer layer, const FRect& crop) override;
+    Return<Error> setLayerTransform(Display display,
+            Layer layer, Transform transform) override;
+    Return<Error> setLayerVisibleRegion(Display display,
+            Layer layer, const hidl_vec<Rect>& visible) override;
+    Return<Error> setLayerZOrder(Display display,
+            Layer layer, uint32_t z) override;
+
+private:
+    void initCapabilities();
+
+    template<typename T>
+    void initDispatch(T& func, hwc2_function_descriptor_t desc);
+    void initDispatch();
+
+    bool hasCapability(Capability capability) const;
+
+    static void hotplugHook(hwc2_callback_data_t callbackData,
+        hwc2_display_t display, int32_t connected);
+    static void refreshHook(hwc2_callback_data_t callbackData,
+        hwc2_display_t display);
+    static void vsyncHook(hwc2_callback_data_t callbackData,
+        hwc2_display_t display, int64_t timestamp);
+
+    hwc2_device_t* mDevice;
+
+    std::unordered_set<Capability> mCapabilities;
+
+    struct {
+        HWC2_PFN_ACCEPT_DISPLAY_CHANGES acceptDisplayChanges;
+        HWC2_PFN_CREATE_LAYER createLayer;
+        HWC2_PFN_CREATE_VIRTUAL_DISPLAY createVirtualDisplay;
+        HWC2_PFN_DESTROY_LAYER destroyLayer;
+        HWC2_PFN_DESTROY_VIRTUAL_DISPLAY destroyVirtualDisplay;
+        HWC2_PFN_DUMP dump;
+        HWC2_PFN_GET_ACTIVE_CONFIG getActiveConfig;
+        HWC2_PFN_GET_CHANGED_COMPOSITION_TYPES getChangedCompositionTypes;
+        HWC2_PFN_GET_CLIENT_TARGET_SUPPORT getClientTargetSupport;
+        HWC2_PFN_GET_COLOR_MODES getColorModes;
+        HWC2_PFN_GET_DISPLAY_ATTRIBUTE getDisplayAttribute;
+        HWC2_PFN_GET_DISPLAY_CONFIGS getDisplayConfigs;
+        HWC2_PFN_GET_DISPLAY_NAME getDisplayName;
+        HWC2_PFN_GET_DISPLAY_REQUESTS getDisplayRequests;
+        HWC2_PFN_GET_DISPLAY_TYPE getDisplayType;
+        HWC2_PFN_GET_DOZE_SUPPORT getDozeSupport;
+        HWC2_PFN_GET_HDR_CAPABILITIES getHdrCapabilities;
+        HWC2_PFN_GET_MAX_VIRTUAL_DISPLAY_COUNT getMaxVirtualDisplayCount;
+        HWC2_PFN_GET_RELEASE_FENCES getReleaseFences;
+        HWC2_PFN_PRESENT_DISPLAY presentDisplay;
+        HWC2_PFN_REGISTER_CALLBACK registerCallback;
+        HWC2_PFN_SET_ACTIVE_CONFIG setActiveConfig;
+        HWC2_PFN_SET_CLIENT_TARGET setClientTarget;
+        HWC2_PFN_SET_COLOR_MODE setColorMode;
+        HWC2_PFN_SET_COLOR_TRANSFORM setColorTransform;
+        HWC2_PFN_SET_CURSOR_POSITION setCursorPosition;
+        HWC2_PFN_SET_LAYER_BLEND_MODE setLayerBlendMode;
+        HWC2_PFN_SET_LAYER_BUFFER setLayerBuffer;
+        HWC2_PFN_SET_LAYER_COLOR setLayerColor;
+        HWC2_PFN_SET_LAYER_COMPOSITION_TYPE setLayerCompositionType;
+        HWC2_PFN_SET_LAYER_DATASPACE setLayerDataspace;
+        HWC2_PFN_SET_LAYER_DISPLAY_FRAME setLayerDisplayFrame;
+        HWC2_PFN_SET_LAYER_PLANE_ALPHA setLayerPlaneAlpha;
+        HWC2_PFN_SET_LAYER_SIDEBAND_STREAM setLayerSidebandStream;
+        HWC2_PFN_SET_LAYER_SOURCE_CROP setLayerSourceCrop;
+        HWC2_PFN_SET_LAYER_SURFACE_DAMAGE setLayerSurfaceDamage;
+        HWC2_PFN_SET_LAYER_TRANSFORM setLayerTransform;
+        HWC2_PFN_SET_LAYER_VISIBLE_REGION setLayerVisibleRegion;
+        HWC2_PFN_SET_LAYER_Z_ORDER setLayerZOrder;
+        HWC2_PFN_SET_OUTPUT_BUFFER setOutputBuffer;
+        HWC2_PFN_SET_POWER_MODE setPowerMode;
+        HWC2_PFN_SET_VSYNC_ENABLED setVsyncEnabled;
+        HWC2_PFN_VALIDATE_DISPLAY validateDisplay;
+    } mDispatch;
+
+    // cloned buffers for a display
+    struct DisplayBuffers {
+        BufferClone ClientTarget;
+        BufferClone OutputBuffer;
+
+        std::unordered_map<Layer, BufferClone> LayerBuffers;
+        std::unordered_map<Layer, BufferClone> LayerSidebandStreams;
+    };
+
+    std::mutex mCallbackMutex;
+    sp<IComposerCallback> mCallback;
+
+    std::mutex mDisplayMutex;
+    std::unordered_map<Display, DisplayBuffers> mDisplays;
+};
+
+HwcHal::HwcHal(const hw_module_t* module)
+    : mDevice(nullptr), mDispatch()
+{
+    if (!sHandleImporter.initialize()) {
+        LOG_ALWAYS_FATAL("failed to initialize handle importer");
+    }
+
+    int status = hwc2_open(module, &mDevice);
+    if (status) {
+        LOG_ALWAYS_FATAL("failed to open hwcomposer2 device: %s",
+                strerror(-status));
+    }
+
+    initCapabilities();
+    initDispatch();
+}
+
+HwcHal::~HwcHal()
+{
+    hwc2_close(mDevice);
+    mDisplays.clear();
+    sHandleImporter.cleanup();
+}
+
+void HwcHal::initCapabilities()
+{
+    uint32_t count = 0;
+    mDevice->getCapabilities(mDevice, &count, nullptr);
+
+    std::vector<Capability> caps(count);
+    mDevice->getCapabilities(mDevice, &count, reinterpret_cast<
+              std::underlying_type<Capability>::type*>(caps.data()));
+    caps.resize(count);
+
+    mCapabilities.insert(caps.cbegin(), caps.cend());
+}
+
+template<typename T>
+void HwcHal::initDispatch(T& func, hwc2_function_descriptor_t desc)
+{
+    auto pfn = mDevice->getFunction(mDevice, desc);
+    if (!pfn) {
+        LOG_ALWAYS_FATAL("failed to get hwcomposer2 function %d", desc);
+    }
+
+    func = reinterpret_cast<T>(pfn);
+}
+
+void HwcHal::initDispatch()
+{
+    initDispatch(mDispatch.acceptDisplayChanges,
+            HWC2_FUNCTION_ACCEPT_DISPLAY_CHANGES);
+    initDispatch(mDispatch.createLayer, HWC2_FUNCTION_CREATE_LAYER);
+    initDispatch(mDispatch.createVirtualDisplay,
+            HWC2_FUNCTION_CREATE_VIRTUAL_DISPLAY);
+    initDispatch(mDispatch.destroyLayer, HWC2_FUNCTION_DESTROY_LAYER);
+    initDispatch(mDispatch.destroyVirtualDisplay,
+            HWC2_FUNCTION_DESTROY_VIRTUAL_DISPLAY);
+    initDispatch(mDispatch.dump, HWC2_FUNCTION_DUMP);
+    initDispatch(mDispatch.getActiveConfig, HWC2_FUNCTION_GET_ACTIVE_CONFIG);
+    initDispatch(mDispatch.getChangedCompositionTypes,
+            HWC2_FUNCTION_GET_CHANGED_COMPOSITION_TYPES);
+    initDispatch(mDispatch.getClientTargetSupport,
+            HWC2_FUNCTION_GET_CLIENT_TARGET_SUPPORT);
+    initDispatch(mDispatch.getColorModes, HWC2_FUNCTION_GET_COLOR_MODES);
+    initDispatch(mDispatch.getDisplayAttribute,
+            HWC2_FUNCTION_GET_DISPLAY_ATTRIBUTE);
+    initDispatch(mDispatch.getDisplayConfigs,
+            HWC2_FUNCTION_GET_DISPLAY_CONFIGS);
+    initDispatch(mDispatch.getDisplayName, HWC2_FUNCTION_GET_DISPLAY_NAME);
+    initDispatch(mDispatch.getDisplayRequests,
+            HWC2_FUNCTION_GET_DISPLAY_REQUESTS);
+    initDispatch(mDispatch.getDisplayType, HWC2_FUNCTION_GET_DISPLAY_TYPE);
+    initDispatch(mDispatch.getDozeSupport, HWC2_FUNCTION_GET_DOZE_SUPPORT);
+    initDispatch(mDispatch.getHdrCapabilities,
+            HWC2_FUNCTION_GET_HDR_CAPABILITIES);
+    initDispatch(mDispatch.getMaxVirtualDisplayCount,
+            HWC2_FUNCTION_GET_MAX_VIRTUAL_DISPLAY_COUNT);
+    initDispatch(mDispatch.getReleaseFences,
+            HWC2_FUNCTION_GET_RELEASE_FENCES);
+    initDispatch(mDispatch.presentDisplay, HWC2_FUNCTION_PRESENT_DISPLAY);
+    initDispatch(mDispatch.registerCallback, HWC2_FUNCTION_REGISTER_CALLBACK);
+    initDispatch(mDispatch.setActiveConfig, HWC2_FUNCTION_SET_ACTIVE_CONFIG);
+    initDispatch(mDispatch.setClientTarget, HWC2_FUNCTION_SET_CLIENT_TARGET);
+    initDispatch(mDispatch.setColorMode, HWC2_FUNCTION_SET_COLOR_MODE);
+    initDispatch(mDispatch.setColorTransform,
+            HWC2_FUNCTION_SET_COLOR_TRANSFORM);
+    initDispatch(mDispatch.setCursorPosition,
+            HWC2_FUNCTION_SET_CURSOR_POSITION);
+    initDispatch(mDispatch.setLayerBlendMode,
+            HWC2_FUNCTION_SET_LAYER_BLEND_MODE);
+    initDispatch(mDispatch.setLayerBuffer, HWC2_FUNCTION_SET_LAYER_BUFFER);
+    initDispatch(mDispatch.setLayerColor, HWC2_FUNCTION_SET_LAYER_COLOR);
+    initDispatch(mDispatch.setLayerCompositionType,
+            HWC2_FUNCTION_SET_LAYER_COMPOSITION_TYPE);
+    initDispatch(mDispatch.setLayerDataspace,
+            HWC2_FUNCTION_SET_LAYER_DATASPACE);
+    initDispatch(mDispatch.setLayerDisplayFrame,
+            HWC2_FUNCTION_SET_LAYER_DISPLAY_FRAME);
+    initDispatch(mDispatch.setLayerPlaneAlpha,
+            HWC2_FUNCTION_SET_LAYER_PLANE_ALPHA);
+
+    if (hasCapability(Capability::SIDEBAND_STREAM)) {
+        initDispatch(mDispatch.setLayerSidebandStream,
+                HWC2_FUNCTION_SET_LAYER_SIDEBAND_STREAM);
+    }
+
+    initDispatch(mDispatch.setLayerSourceCrop,
+            HWC2_FUNCTION_SET_LAYER_SOURCE_CROP);
+    initDispatch(mDispatch.setLayerSurfaceDamage,
+            HWC2_FUNCTION_SET_LAYER_SURFACE_DAMAGE);
+    initDispatch(mDispatch.setLayerTransform,
+            HWC2_FUNCTION_SET_LAYER_TRANSFORM);
+    initDispatch(mDispatch.setLayerVisibleRegion,
+            HWC2_FUNCTION_SET_LAYER_VISIBLE_REGION);
+    initDispatch(mDispatch.setLayerZOrder, HWC2_FUNCTION_SET_LAYER_Z_ORDER);
+    initDispatch(mDispatch.setOutputBuffer, HWC2_FUNCTION_SET_OUTPUT_BUFFER);
+    initDispatch(mDispatch.setPowerMode, HWC2_FUNCTION_SET_POWER_MODE);
+    initDispatch(mDispatch.setVsyncEnabled, HWC2_FUNCTION_SET_VSYNC_ENABLED);
+    initDispatch(mDispatch.validateDisplay, HWC2_FUNCTION_VALIDATE_DISPLAY);
+}
+
+bool HwcHal::hasCapability(Capability capability) const
+{
+    return (mCapabilities.count(capability) > 0);
+}
+
+Return<void> HwcHal::getCapabilities(getCapabilities_cb hidl_cb)
+{
+    std::vector<Capability> caps(
+            mCapabilities.cbegin(), mCapabilities.cend());
+
+    hidl_vec<Capability> caps_reply;
+    caps_reply.setToExternal(caps.data(), caps.size());
+    hidl_cb(caps_reply);
+
+    return Void();
+}
+
+Return<void> HwcHal::dumpDebugInfo(dumpDebugInfo_cb hidl_cb)
+{
+    uint32_t len;
+    mDispatch.dump(mDevice, &len, nullptr);
+
+    std::vector<char> buf(len + 1);
+    mDispatch.dump(mDevice, &len, buf.data());
+    buf.resize(len + 1);
+    buf[len] = '\0';
+
+    hidl_string buf_reply;
+    buf_reply.setToExternal(buf.data(), len);
+    hidl_cb(buf_reply);
+
+    return Void();
+}
+
+void HwcHal::hotplugHook(hwc2_callback_data_t callbackData,
+        hwc2_display_t display, int32_t connected)
+{
+    auto hal = reinterpret_cast<HwcHal*>(callbackData);
+
+    {
+        std::lock_guard<std::mutex> lock(hal->mDisplayMutex);
+
+        if (connected == HWC2_CONNECTION_CONNECTED) {
+            hal->mDisplays.emplace(display, DisplayBuffers());
+        } else if (connected == HWC2_CONNECTION_DISCONNECTED) {
+            hal->mDisplays.erase(display);
+        }
+    }
+
+    hal->mCallback->onHotplug(display,
+            static_cast<IComposerCallback::Connection>(connected));
+}
+
+void HwcHal::refreshHook(hwc2_callback_data_t callbackData,
+        hwc2_display_t display)
+{
+    auto hal = reinterpret_cast<HwcHal*>(callbackData);
+    hal->mCallback->onRefresh(display);
+}
+
+void HwcHal::vsyncHook(hwc2_callback_data_t callbackData,
+        hwc2_display_t display, int64_t timestamp)
+{
+    auto hal = reinterpret_cast<HwcHal*>(callbackData);
+    hal->mCallback->onVsync(display, timestamp);
+}
+
+Return<void> HwcHal::registerCallback(const sp<IComposerCallback>& callback)
+{
+    std::lock_guard<std::mutex> lock(mCallbackMutex);
+
+    mCallback = callback;
+
+    mDispatch.registerCallback(mDevice, HWC2_CALLBACK_HOTPLUG, this,
+            reinterpret_cast<hwc2_function_pointer_t>(hotplugHook));
+    mDispatch.registerCallback(mDevice, HWC2_CALLBACK_REFRESH, this,
+            reinterpret_cast<hwc2_function_pointer_t>(refreshHook));
+    mDispatch.registerCallback(mDevice, HWC2_CALLBACK_VSYNC, this,
+            reinterpret_cast<hwc2_function_pointer_t>(vsyncHook));
+
+    return Void();
+}
+
+Return<uint32_t> HwcHal::getMaxVirtualDisplayCount()
+{
+    return mDispatch.getMaxVirtualDisplayCount(mDevice);
+}
+
+Return<void> HwcHal::createVirtualDisplay(uint32_t width, uint32_t height,
+        PixelFormat formatHint, createVirtualDisplay_cb hidl_cb)
+{
+    int32_t format = static_cast<int32_t>(formatHint);
+    hwc2_display_t display;
+    auto error = mDispatch.createVirtualDisplay(mDevice, width, height,
+            &format, &display);
+    if (error == HWC2_ERROR_NONE) {
+        std::lock_guard<std::mutex> lock(mDisplayMutex);
+
+        mDisplays.emplace(display, DisplayBuffers());
+    }
+
+    hidl_cb(static_cast<Error>(error), display,
+            static_cast<PixelFormat>(format));
+
+    return Void();
+}
+
+Return<Error> HwcHal::destroyVirtualDisplay(Display display)
+{
+    auto error = mDispatch.destroyVirtualDisplay(mDevice, display);
+    if (error == HWC2_ERROR_NONE) {
+        std::lock_guard<std::mutex> lock(mDisplayMutex);
+
+        mDisplays.erase(display);
+    }
+
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::acceptDisplayChanges(Display display)
+{
+    auto error = mDispatch.acceptDisplayChanges(mDevice, display);
+    return static_cast<Error>(error);
+}
+
+Return<void> HwcHal::createLayer(Display display, createLayer_cb hidl_cb)
+{
+    hwc2_layer_t layer;
+    auto error = mDispatch.createLayer(mDevice, display, &layer);
+
+    hidl_cb(static_cast<Error>(error), layer);
+
+    return Void();
+}
+
+Return<Error> HwcHal::destroyLayer(Display display, Layer layer)
+{
+    auto error = mDispatch.destroyLayer(mDevice, display, layer);
+    return static_cast<Error>(error);
+}
+
+Return<void> HwcHal::getActiveConfig(Display display,
+        getActiveConfig_cb hidl_cb)
+{
+    hwc2_config_t config;
+    auto error = mDispatch.getActiveConfig(mDevice, display, &config);
+
+    hidl_cb(static_cast<Error>(error), config);
+
+    return Void();
+}
+
+Return<void> HwcHal::getChangedCompositionTypes(Display display,
+        getChangedCompositionTypes_cb hidl_cb)
+{
+    uint32_t count = 0;
+    auto error = mDispatch.getChangedCompositionTypes(mDevice, display,
+            &count, nullptr, nullptr);
+    if (error != HWC2_ERROR_NONE) {
+        count = 0;
+    }
+
+    std::vector<hwc2_layer_t> layers(count);
+    std::vector<Composition> types(count);
+    error = mDispatch.getChangedCompositionTypes(mDevice, display,
+            &count, layers.data(),
+            reinterpret_cast<std::underlying_type<Composition>::type*>(
+                types.data()));
+    if (error != HWC2_ERROR_NONE) {
+        count = 0;
+    }
+    layers.resize(count);
+    types.resize(count);
+
+    hidl_vec<Layer> layers_reply;
+    layers_reply.setToExternal(layers.data(), layers.size());
+
+    hidl_vec<Composition> types_reply;
+    types_reply.setToExternal(types.data(), types.size());
+
+    hidl_cb(static_cast<Error>(error), layers_reply, types_reply);
+
+    return Void();
+}
+
+Return<Error> HwcHal::getClientTargetSupport(Display display,
+        uint32_t width, uint32_t height,
+        PixelFormat format, Dataspace dataspace)
+{
+    auto error = mDispatch.getClientTargetSupport(mDevice, display,
+            width, height, static_cast<int32_t>(format),
+            static_cast<int32_t>(dataspace));
+    return static_cast<Error>(error);
+}
+
+Return<void> HwcHal::getColorModes(Display display, getColorModes_cb hidl_cb)
+{
+    uint32_t count = 0;
+    auto error = mDispatch.getColorModes(mDevice, display, &count, nullptr);
+    if (error != HWC2_ERROR_NONE) {
+        count = 0;
+    }
+
+    std::vector<ColorMode> modes(count);
+    error = mDispatch.getColorModes(mDevice, display, &count,
+            reinterpret_cast<std::underlying_type<ColorMode>::type*>(
+                modes.data()));
+    if (error != HWC2_ERROR_NONE) {
+        count = 0;
+    }
+    modes.resize(count);
+
+    hidl_vec<ColorMode> modes_reply;
+    modes_reply.setToExternal(modes.data(), modes.size());
+    hidl_cb(static_cast<Error>(error), modes_reply);
+
+    return Void();
+}
+
+Return<void> HwcHal::getDisplayAttribute(Display display,
+        Config config, Attribute attribute,
+        getDisplayAttribute_cb hidl_cb)
+{
+    int32_t value;
+    auto error = mDispatch.getDisplayAttribute(mDevice, display, config,
+            static_cast<int32_t>(attribute), &value);
+
+    hidl_cb(static_cast<Error>(error), value);
+
+    return Void();
+}
+
+Return<void> HwcHal::getDisplayConfigs(Display display,
+        getDisplayConfigs_cb hidl_cb)
+{
+    uint32_t count = 0;
+    auto error = mDispatch.getDisplayConfigs(mDevice, display,
+            &count, nullptr);
+    if (error != HWC2_ERROR_NONE) {
+        count = 0;
+    }
+
+    std::vector<hwc2_config_t> configs(count);
+    error = mDispatch.getDisplayConfigs(mDevice, display,
+            &count, configs.data());
+    if (error != HWC2_ERROR_NONE) {
+        count = 0;
+    }
+    configs.resize(count);
+
+    hidl_vec<Config> configs_reply;
+    configs_reply.setToExternal(configs.data(), configs.size());
+    hidl_cb(static_cast<Error>(error), configs_reply);
+
+    return Void();
+}
+
+Return<void> HwcHal::getDisplayName(Display display,
+        getDisplayName_cb hidl_cb)
+{
+    uint32_t count = 0;
+    auto error = mDispatch.getDisplayName(mDevice, display, &count, nullptr);
+    if (error != HWC2_ERROR_NONE) {
+        count = 0;
+    }
+
+    std::vector<char> name(count + 1);
+    error = mDispatch.getDisplayName(mDevice, display, &count, name.data());
+    if (error != HWC2_ERROR_NONE) {
+        count = 0;
+    }
+    name.resize(count + 1);
+    name[count] = '\0';
+
+    hidl_string name_reply;
+    name_reply.setToExternal(name.data(), count);
+    hidl_cb(static_cast<Error>(error), name_reply);
+
+    return Void();
+}
+
+Return<void> HwcHal::getDisplayRequests(Display display,
+        getDisplayRequests_cb hidl_cb)
+{
+    int32_t display_reqs;
+    uint32_t count = 0;
+    auto error = mDispatch.getDisplayRequests(mDevice, display,
+            &display_reqs, &count, nullptr, nullptr);
+    if (error != HWC2_ERROR_NONE) {
+        count = 0;
+    }
+
+    std::vector<hwc2_layer_t> layers(count);
+    std::vector<int32_t> layer_reqs(count);
+    error = mDispatch.getDisplayRequests(mDevice, display,
+            &display_reqs, &count, layers.data(), layer_reqs.data());
+    if (error != HWC2_ERROR_NONE) {
+        count = 0;
+    }
+    layers.resize(count);
+    layer_reqs.resize(count);
+
+    hidl_vec<Layer> layers_reply;
+    layers_reply.setToExternal(layers.data(), layers.size());
+
+    hidl_vec<uint32_t> layer_reqs_reply;
+    layer_reqs_reply.setToExternal(
+            reinterpret_cast<uint32_t*>(layer_reqs.data()),
+            layer_reqs.size());
+
+    hidl_cb(static_cast<Error>(error), display_reqs,
+            layers_reply, layer_reqs_reply);
+
+    return Void();
+}
+
+Return<void> HwcHal::getDisplayType(Display display,
+        getDisplayType_cb hidl_cb)
+{
+    int32_t type;
+    auto error = mDispatch.getDisplayType(mDevice, display, &type);
+
+    hidl_cb(static_cast<Error>(error), static_cast<DisplayType>(type));
+
+    return Void();
+}
+
+Return<void> HwcHal::getDozeSupport(Display display,
+        getDozeSupport_cb hidl_cb)
+{
+    int32_t support;
+    auto error = mDispatch.getDozeSupport(mDevice, display, &support);
+
+    hidl_cb(static_cast<Error>(error), support);
+
+    return Void();
+}
+
+Return<void> HwcHal::getHdrCapabilities(Display display,
+        getHdrCapabilities_cb hidl_cb)
+{
+    float max_lumi, max_avg_lumi, min_lumi;
+    uint32_t count = 0;
+    auto error = mDispatch.getHdrCapabilities(mDevice, display,
+            &count, nullptr, &max_lumi, &max_avg_lumi, &min_lumi);
+    if (error != HWC2_ERROR_NONE) {
+        count = 0;
+    }
+
+    std::vector<Hdr> types(count);
+    error = mDispatch.getHdrCapabilities(mDevice, display, &count,
+            reinterpret_cast<std::underlying_type<Hdr>::type*>(types.data()),
+            &max_lumi, &max_avg_lumi, &min_lumi);
+    if (error != HWC2_ERROR_NONE) {
+        count = 0;
+    }
+    types.resize(count);
+
+    hidl_vec<Hdr> types_reply;
+    types_reply.setToExternal(types.data(), types.size());
+    hidl_cb(static_cast<Error>(error), types_reply,
+            max_lumi, max_avg_lumi, min_lumi);
+
+    return Void();
+}
+
+Return<void> HwcHal::getReleaseFences(Display display,
+        getReleaseFences_cb hidl_cb)
+{
+    uint32_t count = 0;
+    auto error = mDispatch.getReleaseFences(mDevice, display,
+            &count, nullptr, nullptr);
+    if (error != HWC2_ERROR_NONE) {
+        count = 0;
+    }
+
+    std::vector<hwc2_layer_t> layers(count);
+    std::vector<int32_t> fences(count);
+    error = mDispatch.getReleaseFences(mDevice, display,
+            &count, layers.data(), fences.data());
+    if (error != HWC2_ERROR_NONE) {
+        count = 0;
+    }
+    layers.resize(count);
+    fences.resize(count);
+
+    // filter out layers with release fence -1
+    std::vector<hwc2_layer_t> filtered_layers;
+    std::vector<int> filtered_fences;
+    for (size_t i = 0; i < layers.size(); i++) {
+        if (fences[i] >= 0) {
+            filtered_layers.push_back(layers[i]);
+            filtered_fences.push_back(fences[i]);
+        }
+    }
+
+    hidl_vec<Layer> layers_reply;
+    native_handle_t* fences_reply =
+        native_handle_create(filtered_fences.size(), 0);
+    if (fences_reply) {
+        layers_reply.setToExternal(filtered_layers.data(),
+                filtered_layers.size());
+        memcpy(fences_reply->data, filtered_fences.data(),
+                sizeof(int) * filtered_fences.size());
+
+        hidl_cb(static_cast<Error>(error), layers_reply, fences_reply);
+
+        native_handle_close(fences_reply);
+        native_handle_delete(fences_reply);
+    } else {
+        NATIVE_HANDLE_DECLARE_STORAGE(fences_storage, 0, 0);
+        fences_reply = native_handle_init(fences_storage, 0, 0);
+
+        hidl_cb(Error::NO_RESOURCES, layers_reply, fences_reply);
+
+        for (auto fence : filtered_fences) {
+            close(fence);
+        }
+    }
+
+    return Void();
+}
+
+Return<void> HwcHal::presentDisplay(Display display,
+        presentDisplay_cb hidl_cb)
+{
+    int32_t fence = -1;
+    auto error = mDispatch.presentDisplay(mDevice, display, &fence);
+
+    NATIVE_HANDLE_DECLARE_STORAGE(fence_storage, 1, 0);
+    native_handle_t* fence_reply;
+    if (fence >= 0) {
+        fence_reply = native_handle_init(fence_storage, 1, 0);
+        fence_reply->data[0] = fence;
+    } else {
+        fence_reply = native_handle_init(fence_storage, 0, 0);
+    }
+
+    hidl_cb(static_cast<Error>(error), fence_reply);
+
+    if (fence >= 0) {
+        close(fence);
+    }
+
+    return Void();
+}
+
+Return<Error> HwcHal::setActiveConfig(Display display, Config config)
+{
+    auto error = mDispatch.setActiveConfig(mDevice, display, config);
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setClientTarget(Display display,
+        const native_handle_t* target,
+        const native_handle_t* acquireFence,
+        Dataspace dataspace, const hidl_vec<Rect>& damage)
+{
+    if (!sHandleImporter.importBuffer(target)) {
+        return Error::NO_RESOURCES;
+    }
+
+    int32_t fence;
+    if (!sHandleImporter.importFence(acquireFence, fence)) {
+        sHandleImporter.freeBuffer(target);
+        return Error::NO_RESOURCES;
+    }
+
+    hwc_region_t damage_region = { damage.size(),
+        reinterpret_cast<const hwc_rect_t*>(&damage[0]) };
+
+    int32_t error = mDispatch.setClientTarget(mDevice, display,
+            target, fence, static_cast<int32_t>(dataspace),
+            damage_region);
+    if (error == HWC2_ERROR_NONE) {
+        std::lock_guard<std::mutex> lock(mDisplayMutex);
+
+        auto dpy = mDisplays.find(display);
+        dpy->second.ClientTarget = target;
+    } else {
+        sHandleImporter.freeBuffer(target);
+        sHandleImporter.closeFence(fence);
+    }
+
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setColorMode(Display display, ColorMode mode)
+{
+    auto error = mDispatch.setColorMode(mDevice, display,
+            static_cast<int32_t>(mode));
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setColorTransform(Display display,
+        const hidl_vec<float>& matrix, ColorTransform hint)
+{
+    auto error = mDispatch.setColorTransform(mDevice, display,
+            &matrix[0], static_cast<int32_t>(hint));
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setOutputBuffer(Display display,
+        const native_handle_t* buffer,
+        const native_handle_t* releaseFence)
+{
+    if (!sHandleImporter.importBuffer(buffer)) {
+        return Error::NO_RESOURCES;
+    }
+
+    int32_t fence;
+    if (!sHandleImporter.importFence(releaseFence, fence)) {
+        sHandleImporter.freeBuffer(buffer);
+        return Error::NO_RESOURCES;
+    }
+
+    int32_t error = mDispatch.setOutputBuffer(mDevice,
+            display, buffer, fence);
+    if (error == HWC2_ERROR_NONE) {
+        std::lock_guard<std::mutex> lock(mDisplayMutex);
+
+        auto dpy = mDisplays.find(display);
+        dpy->second.OutputBuffer = buffer;
+    } else {
+        sHandleImporter.freeBuffer(buffer);
+    }
+
+    // unlike in setClientTarget, fence is owned by us and is always closed
+    sHandleImporter.closeFence(fence);
+
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setPowerMode(Display display, PowerMode mode)
+{
+    auto error = mDispatch.setPowerMode(mDevice, display,
+            static_cast<int32_t>(mode));
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setVsyncEnabled(Display display,
+        Vsync enabled)
+{
+    auto error = mDispatch.setVsyncEnabled(mDevice, display,
+            static_cast<int32_t>(enabled));
+    return static_cast<Error>(error);
+}
+
+Return<void> HwcHal::validateDisplay(Display display,
+        validateDisplay_cb hidl_cb)
+{
+    uint32_t types_count = 0;
+    uint32_t reqs_count = 0;
+    auto error = mDispatch.validateDisplay(mDevice, display,
+            &types_count, &reqs_count);
+
+    hidl_cb(static_cast<Error>(error), types_count, reqs_count);
+
+    return Void();
+}
+
+Return<Error> HwcHal::setCursorPosition(Display display,
+        Layer layer, int32_t x, int32_t y)
+{
+    auto error = mDispatch.setCursorPosition(mDevice, display, layer, x, y);
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setLayerBuffer(Display display,
+        Layer layer, const native_handle_t* buffer,
+        const native_handle_t* acquireFence)
+{
+    if (!sHandleImporter.importBuffer(buffer)) {
+        return Error::NO_RESOURCES;
+    }
+
+    int32_t fence;
+    if (!sHandleImporter.importFence(acquireFence, fence)) {
+        sHandleImporter.freeBuffer(buffer);
+        return Error::NO_RESOURCES;
+    }
+
+    int32_t error = mDispatch.setLayerBuffer(mDevice,
+            display, layer, buffer, fence);
+    if (error == HWC2_ERROR_NONE) {
+        std::lock_guard<std::mutex> lock(mDisplayMutex);
+
+        auto dpy = mDisplays.find(display);
+        dpy->second.LayerBuffers[layer] = buffer;
+    } else {
+        sHandleImporter.freeBuffer(buffer);
+        sHandleImporter.closeFence(fence);
+    }
+
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setLayerSurfaceDamage(Display display,
+        Layer layer, const hidl_vec<Rect>& damage)
+{
+    hwc_region_t damage_region = { damage.size(),
+        reinterpret_cast<const hwc_rect_t*>(&damage[0]) };
+
+    auto error = mDispatch.setLayerSurfaceDamage(mDevice, display, layer,
+            damage_region);
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setLayerBlendMode(Display display,
+        Layer layer, BlendMode mode)
+{
+    auto error = mDispatch.setLayerBlendMode(mDevice, display, layer,
+            static_cast<int32_t>(mode));
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setLayerColor(Display display,
+        Layer layer, const Color& color)
+{
+    hwc_color_t hwc_color{color.r, color.g, color.b, color.a};
+    auto error = mDispatch.setLayerColor(mDevice, display, layer, hwc_color);
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setLayerCompositionType(Display display,
+        Layer layer, Composition type)
+{
+    auto error = mDispatch.setLayerCompositionType(mDevice, display, layer,
+            static_cast<int32_t>(type));
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setLayerDataspace(Display display,
+        Layer layer, Dataspace dataspace)
+{
+    auto error = mDispatch.setLayerDataspace(mDevice, display, layer,
+            static_cast<int32_t>(dataspace));
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setLayerDisplayFrame(Display display,
+        Layer layer, const Rect& frame)
+{
+    hwc_rect_t hwc_frame{frame.left, frame.top, frame.right, frame.bottom};
+    auto error = mDispatch.setLayerDisplayFrame(mDevice, display, layer,
+            hwc_frame);
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setLayerPlaneAlpha(Display display,
+        Layer layer, float alpha)
+{
+    auto error = mDispatch.setLayerPlaneAlpha(mDevice, display, layer, alpha);
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setLayerSidebandStream(Display display,
+        Layer layer, const native_handle_t* stream)
+{
+    if (!sHandleImporter.importBuffer(stream)) {
+        return Error::NO_RESOURCES;
+    }
+
+    int32_t error = mDispatch.setLayerSidebandStream(mDevice,
+            display, layer, stream);
+    if (error == HWC2_ERROR_NONE) {
+        std::lock_guard<std::mutex> lock(mDisplayMutex);
+
+        auto dpy = mDisplays.find(display);
+        dpy->second.LayerSidebandStreams[layer] = stream;
+    } else {
+        sHandleImporter.freeBuffer(stream);
+    }
+
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setLayerSourceCrop(Display display,
+        Layer layer, const FRect& crop)
+{
+    hwc_frect_t hwc_crop{crop.left, crop.top, crop.right, crop.bottom};
+    auto error = mDispatch.setLayerSourceCrop(mDevice, display, layer,
+            hwc_crop);
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setLayerTransform(Display display,
+        Layer layer, Transform transform)
+{
+    auto error = mDispatch.setLayerTransform(mDevice, display, layer,
+            static_cast<int32_t>(transform));
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setLayerVisibleRegion(Display display,
+        Layer layer, const hidl_vec<Rect>& visible)
+{
+    hwc_region_t visible_region = { visible.size(),
+        reinterpret_cast<const hwc_rect_t*>(&visible[0]) };
+
+    auto error = mDispatch.setLayerVisibleRegion(mDevice, display, layer,
+            visible_region);
+    return static_cast<Error>(error);
+}
+
+Return<Error> HwcHal::setLayerZOrder(Display display,
+        Layer layer, uint32_t z)
+{
+    auto error = mDispatch.setLayerZOrder(mDevice, display, layer, z);
+    return static_cast<Error>(error);
+}
+
+IComposer* HIDL_FETCH_IComposer(const char*)
+{
+    const hw_module_t* module;
+    int err = hw_get_module(HWC_HARDWARE_MODULE_ID, &module);
+    if (err) {
+        ALOGE("failed to get hwcomposer module");
+        return nullptr;
+    }
+
+    return new HwcHal(module);
+}
+
+} // namespace implementation
+} // namespace V2_1
+} // namespace composer
+} // namespace graphics
+} // namespace hardware
+} // namespace android
diff --git a/graphics/composer/2.1/default/Hwc.h b/graphics/composer/2.1/default/Hwc.h
new file mode 100644
index 0000000..de69417
--- /dev/null
+++ b/graphics/composer/2.1/default/Hwc.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2016 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.
+ */
+
+#ifndef ANDROID_HARDWARE_GRAPHICS_COMPOSER_V2_1_HWC_H
+#define ANDROID_HARDWARE_GRAPHICS_COMPOSER_V2_1_HWC_H
+
+#include <android/hardware/graphics/composer/2.1/IComposer.h>
+
+namespace android {
+namespace hardware {
+namespace graphics {
+namespace composer {
+namespace V2_1 {
+namespace implementation {
+
+extern "C" IComposer* HIDL_FETCH_IComposer(const char* name);
+
+} // namespace implementation
+} // namespace V2_1
+} // namespace composer
+} // namespace graphics
+} // namespace hardware
+} // namespace android
+
+#endif  // ANDROID_HARDWARE_GRAPHICS_COMPOSER_V2_1_HWC_H
diff --git a/graphics/composer/2.1/types.hal b/graphics/composer/2.1/types.hal
new file mode 100644
index 0000000..3c591b3
--- /dev/null
+++ b/graphics/composer/2.1/types.hal
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2016 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 android.hardware.graphics.composer@2.1;
+
+/* Return codes from all functions. */
+enum Error : int32_t {
+    NONE            = 0, /* no error */
+    BAD_CONFIG      = 1, /* invalid Config */
+    BAD_DISPLAY     = 2, /* invalid Display */
+    BAD_LAYER       = 3, /* invalid Layer */
+    BAD_PARAMETER   = 4, /* invalid width, height, etc. */
+    HAS_CHANGES     = 5,
+    NO_RESOURCES    = 6, /* temporary failure due to resource contention */
+    NOT_VALIDATED   = 7, /* validateDisplay has not been called */
+    UNSUPPORTED     = 8, /* permanent failure */
+};
+
+typedef uint32_t Config;
+typedef uint64_t Display;
+typedef uint64_t Layer;
+
+/*
+ * Copied from android_transform_t
+ *
+ * TODO(olv) copy comments over and generate android_transform_t
+ */
+enum Transform : int32_t {
+    FLIP_H    = 0x1,
+    FLIP_V    = 0x2,
+    ROT_90    = 0x4,
+    ROT_180   = 0x3,
+    ROT_270   = 0x7,
+    RESERVED  = 0x8,
+};
+
+/*
+ * Copied from android_color_mode_t
+ *
+ * TODO(olv) copy comments over and generate android_color_mode_t
+ */
+enum ColorMode : int32_t {
+  NATIVE                        = 0,
+  STANDARD_BT601_625            = 1,
+  STANDARD_BT601_625_UNADJUSTED = 2,
+  STANDARD_BT601_525            = 3,
+  STANDARD_BT601_525_UNADJUSTED = 4,
+  STANDARD_BT709                = 5,
+  DCI_P3                        = 6,
+  SRGB                          = 7,
+  ADOBE_RGB                     = 8,
+};
+
+/*
+ * Copied from android_color_transform_t
+ *
+ * TODO(olv) copy comments over and generate android_color_transform_t
+ */
+enum ColorTransform : int32_t {
+    IDENTITY             = 0,
+    ARBITRARY_MATRIX     = 1,
+    VALUE_INVERSE        = 2,
+    GRAYSCALE            = 3,
+    CORRECT_PROTANOPIA   = 4,
+    CORRECT_DEUTERANOPIA = 5,
+    CORRECT_TRITANOPIA   = 6
+};
+
+/*
+ * Copied from android_dataspace_t
+ *
+ * TODO(olv) copy comments over and generate android_dataspace_t
+ */
+enum Dataspace : int32_t {
+    UNKNOWN                            = 0x0,
+    ARBITRARY                          = 0x1,
+
+    STANDARD_SHIFT                     = 16,
+    STANDARD_MASK                      = 63 << STANDARD_SHIFT,
+    STANDARD_UNSPECIFIED               = 0 << STANDARD_SHIFT,
+    STANDARD_BT709                     = 1 << STANDARD_SHIFT,
+    STANDARD_BT601_625                 = 2 << STANDARD_SHIFT,
+    STANDARD_BT601_625_UNADJUSTED      = 3 << STANDARD_SHIFT,
+    STANDARD_BT601_525                 = 4 << STANDARD_SHIFT,
+    STANDARD_BT601_525_UNADJUSTED      = 5 << STANDARD_SHIFT,
+    STANDARD_BT2020                    = 6 << STANDARD_SHIFT,
+    STANDARD_BT2020_CONSTANT_LUMINANCE = 7 << STANDARD_SHIFT,
+    STANDARD_BT470M                    = 8 << STANDARD_SHIFT,
+    STANDARD_FILM                      = 9 << STANDARD_SHIFT,
+
+    TRANSFER_SHIFT                     = 22,
+    TRANSFER_MASK                      = 31 << TRANSFER_SHIFT,
+    TRANSFER_UNSPECIFIED               = 0 << TRANSFER_SHIFT,
+    TRANSFER_LINEAR                    = 1 << TRANSFER_SHIFT,
+    TRANSFER_SRGB                      = 2 << TRANSFER_SHIFT,
+    TRANSFER_SMPTE_170M                = 3 << TRANSFER_SHIFT,
+    TRANSFER_GAMMA2_2                  = 4 << TRANSFER_SHIFT,
+    TRANSFER_GAMMA2_8                  = 5 << TRANSFER_SHIFT,
+    TRANSFER_ST2084                    = 6 << TRANSFER_SHIFT,
+    TRANSFER_HLG                       = 7 << TRANSFER_SHIFT,
+
+    RANGE_SHIFT                        = 27,
+    RANGE_MASK                         = 7 << RANGE_SHIFT,
+    RANGE_UNSPECIFIED                  = 0 << RANGE_SHIFT,
+    RANGE_FULL                         = 1 << RANGE_SHIFT,
+    RANGE_LIMITED                      = 2 << RANGE_SHIFT,
+
+    SRGB_LINEAR                        = 0x200,
+    V0_SRGB_LINEAR                     = STANDARD_BT709 |
+                                         TRANSFER_LINEAR |
+                                         RANGE_FULL,
+
+    SRGB                               = 0x201,
+    V0_SRGB                            = STANDARD_BT709 |
+                                         TRANSFER_SRGB |
+                                         RANGE_FULL,
+
+    JFIF                               = 0x101,
+    V0_JFIF                            = STANDARD_BT601_625 |
+                                         TRANSFER_SMPTE_170M |
+                                         RANGE_FULL,
+
+    BT601_625                          = 0x102,
+    V0_BT601_625                       = STANDARD_BT601_625 |
+                                         TRANSFER_SMPTE_170M |
+                                         RANGE_LIMITED,
+
+    BT601_525                          = 0x103,
+    V0_BT601_525                       = STANDARD_BT601_525 |
+                                         TRANSFER_SMPTE_170M |
+                                         RANGE_LIMITED,
+
+    BT709                              = 0x104,
+    V0_BT709                           = STANDARD_BT709 |
+                                         TRANSFER_SMPTE_170M |
+                                         RANGE_LIMITED,
+
+    DEPTH                              = 0x1000,
+};
+
+/*
+ * Copied from android_hdr_t
+ *
+ * TODO(olv) copy comments over and generate android_hdr_t
+ */
+enum Hdr : int32_t {
+    DOLBY_VISION = 1,
+    HDR10        = 2,
+    HLG          = 3,
+};