diff --git a/include_all/hardware/audio_amplifier.h b/include_all/hardware/audio_amplifier.h
new file mode 100644
index 0000000..4b6f634
--- /dev/null
+++ b/include_all/hardware/audio_amplifier.h
@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 2015, The CyanogenMod Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CM_AUDIO_AMPLIFIER_INTERFACE_H
+#define CM_AUDIO_AMPLIFIER_INTERFACE_H
+
+#include <stdint.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+#include <hardware/audio.h>
+#include <hardware/hardware.h>
+
+#include <system/audio.h>
+
+__BEGIN_DECLS
+
+#define AMPLIFIER_HARDWARE_MODULE_ID "audio_amplifier"
+
+#define AMPLIFIER_HARDWARE_INTERFACE "audio_amplifier_hw_if"
+
+#define AMPLIFIER_MODULE_API_VERSION_0_1 HARDWARE_MODULE_API_VERSION(0, 1)
+
+#define AMPLIFIER_DEVICE_API_VERSION_1_0 HARDWARE_DEVICE_API_VERSION(1, 0)
+#define AMPLIFIER_DEVICE_API_VERSION_2_0 HARDWARE_DEVICE_API_VERSION(2, 0)
+#define AMPLIFIER_DEVICE_API_VERSION_2_1 HARDWARE_DEVICE_API_VERSION(2, 1)
+#define AMPLIFIER_DEVICE_API_VERSION_CURRENT AMPLIFIER_DEVICE_API_VERSION_2_1
+
+struct str_parms;
+
+typedef struct amplifier_device {
+    /**
+     * Common methods of the amplifier device. This *must* be the first member
+     * of amplifier_device as users of this structure will cast a hw_device_t
+     * to amplifier_device pointer in contexts where it's known
+     * the hw_device_t references a amplifier_device.
+     */
+    struct hw_device_t common;
+
+    /**
+     * Notify amplifier device of current input devices
+     *
+     * This function should handle only input devices.
+     */
+    int (*set_input_devices)(struct amplifier_device *device, uint32_t devices);
+
+    /**
+     * Notify amplifier device of current output devices
+     *
+     * This function should handle only output devices.
+     */
+    int (*set_output_devices)(struct amplifier_device *device, uint32_t devices);
+
+    /**
+     * Notify amplifier device of output device enable/disable
+     *
+     * This function should handle only output devices.
+     */
+    int (*enable_output_devices)(struct amplifier_device *device,
+            uint32_t devices, bool enable);
+
+    /**
+     * Notify amplifier device of input device enable/disable
+     *
+     * This function should handle only input devices.
+     */
+    int (*enable_input_devices)(struct amplifier_device *device,
+            uint32_t devices, bool enable);
+
+    /**
+     * Notify amplifier device about current audio mode
+     */
+    int (*set_mode)(struct amplifier_device *device, audio_mode_t mode);
+
+    /**
+     * Notify amplifier device that an output stream has started
+     */
+    int (*output_stream_start)(struct amplifier_device *device,
+            struct audio_stream_out *stream, bool offload);
+
+    /**
+     * Notify amplifier device that an input stream has started
+     */
+    int (*input_stream_start)(struct amplifier_device *device,
+            struct audio_stream_in *stream);
+
+    /**
+     * Notify amplifier device that an output stream has stopped
+     */
+    int (*output_stream_standby)(struct amplifier_device *device,
+            struct audio_stream_out *stream);
+
+    /**
+     * Notify amplifier device that an input stream has stopped
+     */
+    int (*input_stream_standby)(struct amplifier_device *device,
+            struct audio_stream_in *stream);
+
+    /**
+     * set/get audio device parameters.
+     */
+    int (*set_parameters)(struct amplifier_device *device,
+        struct str_parms *parms);
+
+    /**
+     * set/get output stream parameters.
+     */
+    int (*out_set_parameters)(struct amplifier_device *device,
+        struct str_parms *parms);
+
+    /**
+     * set/get input stream parameters.
+     */
+    int (*in_set_parameters)(struct amplifier_device *device,
+        struct str_parms *parms);
+
+    /**
+     * set feedback
+     */
+    int (*set_feedback)(struct amplifier_device *device,
+        void *adev, uint32_t devices, bool enable);
+
+    /**
+     * Amplifier calibration
+     */
+    int (*calibrate)(void *adev);
+} amplifier_device_t;
+
+typedef struct amplifier_module {
+    /**
+     * Common methods of the amplifier module. This *must* be the first member
+     * of amplifier_module as users of this structure will cast a hw_module_t
+     * to amplifier_module pointer in contexts where it's known
+     * the hw_module_t references a amplifier_module.
+     */
+    struct hw_module_t common;
+} amplifier_module_t;
+
+/** convenience API for opening and closing a supported device */
+
+static inline int amplifier_device_open(const struct hw_module_t *module,
+        struct amplifier_device **device)
+{
+    return module->methods->open(module, AMPLIFIER_HARDWARE_INTERFACE,
+            (struct hw_device_t **) device);
+}
+
+static inline int amplifier_device_close(struct amplifier_device *device)
+{
+    return device->common.close(&device->common);
+}
+
+__END_DECLS
+
+#endif  // CM_AUDIO_AMPLIFIER_INTERFACE_H