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diff --git a/services/inputflinger/include/VibrationElement.h b/services/inputflinger/include/VibrationElement.h
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+++ b/services/inputflinger/include/VibrationElement.h
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+/*
+ * Copyright (C) 2020 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 _VIBRATION_ELEMENT_H
+#define _VIBRATION_ELEMENT_H
+
+#include <array>
+#include <chrono>
+#include <cstdint>
+#include <string>
+#include <vector>
+
+namespace android {
+
+// evdev FF_RUMBLE effect only supports two channels of vibration.
+constexpr size_t CHANNEL_SIZE = 2;
+/*
+ * Describes a rumble effect
+ */
+struct VibrationElement {
+    std::chrono::milliseconds duration;
+    // Channel amplitude range 0-255.
+    std::vector<std::pair<int32_t /*vibratorId*/, uint8_t /*amplitude*/>> channels;
+
+    explicit VibrationElement(size_t channelNum);
+
+    VibrationElement(const VibrationElement& other);
+
+    bool operator==(const VibrationElement& other) const;
+
+    bool operator!=(const VibrationElement& other) const;
+
+    void addChannel(int32_t vibratorId, uint8_t amplitude);
+
+    const std::string toString() const;
+
+    uint16_t getMagnitude(int32_t vibratorId) const;
+
+    bool isOn() const;
+};
+
+/*
+ * Describes a sequence of rumble effect
+ */
+struct VibrationSequence {
+    // Pattern of vibration elements
+    std::vector<VibrationElement> pattern;
+
+    explicit VibrationSequence(size_t length);
+
+    void operator=(const VibrationSequence& other);
+
+    bool operator==(const VibrationSequence& other) const;
+
+    void addElement(VibrationElement element);
+
+    const std::string toString() const;
+};
+
+} // namespace android
+
+#endif // _VIBRATION_ELEMENT_H