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diff --git a/hal/gonk/SensorsTypes.h b/hal/gonk/SensorsTypes.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef hal_gonk_SensorsTypes_h
+#define hal_gonk_SensorsTypes_h
+
+namespace mozilla {
+namespace hal {
+
+enum SensorsDeliveryMode {
+  SENSORS_DELIVERY_MODE_BEST_EFFORT,
+  SENSORS_DELIVERY_MODE_IMMEDIATE
+};
+
+enum SensorsError {
+  SENSORS_ERROR_NONE,
+  SENSORS_ERROR_FAIL,
+  SENSORS_ERROR_NOT_READY,
+  SENSORS_ERROR_NOMEM,
+  SENSORS_ERROR_BUSY,
+  SENSORS_ERROR_DONE,
+  SENSORS_ERROR_UNSUPPORTED,
+  SENSORS_ERROR_PARM_INVALID
+};
+
+enum SensorsStatus {
+  SENSORS_STATUS_NO_CONTACT,
+  SENSORS_STATUS_UNRELIABLE,
+  SENSORS_STATUS_ACCURACY_LOW,
+  SENSORS_STATUS_ACCURACY_MEDIUM,
+  SENSORS_STATUS_ACCURACY_HIGH
+};
+
+enum SensorsTriggerMode {
+  SENSORS_TRIGGER_MODE_CONTINUOUS,
+  SENSORS_TRIGGER_MODE_ON_CHANGE,
+  SENSORS_TRIGGER_MODE_ONE_SHOT,
+  SENSORS_TRIGGER_MODE_SPECIAL
+};
+
+enum SensorsType {
+  SENSORS_TYPE_ACCELEROMETER,
+  SENSORS_TYPE_GEOMAGNETIC_FIELD,
+  SENSORS_TYPE_ORIENTATION,
+  SENSORS_TYPE_GYROSCOPE,
+  SENSORS_TYPE_LIGHT,
+  SENSORS_TYPE_PRESSURE,
+  SENSORS_TYPE_TEMPERATURE,
+  SENSORS_TYPE_PROXIMITY,
+  SENSORS_TYPE_GRAVITY,
+  SENSORS_TYPE_LINEAR_ACCELERATION,
+  SENSORS_TYPE_ROTATION_VECTOR,
+  SENSORS_TYPE_RELATIVE_HUMIDITY,
+  SENSORS_TYPE_AMBIENT_TEMPERATURE,
+  SENSORS_TYPE_MAGNETIC_FIELD_UNCALIBRATED,
+  SENSORS_TYPE_GAME_ROTATION_VECTOR,
+  SENSORS_TYPE_GYROSCOPE_UNCALIBRATED,
+  SENSORS_TYPE_SIGNIFICANT_MOTION,
+  SENSORS_TYPE_STEP_DETECTED,
+  SENSORS_TYPE_STEP_COUNTER,
+  SENSORS_TYPE_GEOMAGNETIC_ROTATION_VECTOR,
+  SENSORS_TYPE_HEART_RATE,
+  SENSORS_TYPE_TILT_DETECTOR,
+  SENSORS_TYPE_WAKE_GESTURE,
+  SENSORS_TYPE_GLANCE_GESTURE,
+  SENSORS_TYPE_PICK_UP_GESTURE,
+  SENSORS_TYPE_WRIST_TILT_GESTURE,
+  SENSORS_NUM_TYPES
+};
+
+struct SensorsEvent {
+  SensorsType mType;
+  SensorsStatus mStatus;
+  SensorsDeliveryMode mDeliveryMode;
+  int64_t mTimestamp;
+  union {
+    float mFloat[6];
+    uint64_t mUint[1];
+  } mData;
+};
+
+/**
+ * |SensorsSensor| represents a device sensor; either single or composite.
+ */
+struct SensorsSensor {
+  SensorsSensor(int32_t aId, SensorsType aType,
+                float aRange, float aResolution,
+                float aPower, int32_t aMinPeriod,
+                int32_t aMaxPeriod,
+                SensorsTriggerMode aTriggerMode,
+                SensorsDeliveryMode aDeliveryMode)
+    : mId(aId)
+    , mType(aType)
+    , mRange(aRange)
+    , mResolution(aResolution)
+    , mPower(aPower)
+    , mMinPeriod(aMinPeriod)
+    , mMaxPeriod(aMaxPeriod)
+    , mTriggerMode(aTriggerMode)
+    , mDeliveryMode(aDeliveryMode)
+  { }
+
+  int32_t mId;
+  SensorsType mType;
+  float mRange;
+  float mResolution;
+  float mPower;
+  int32_t mMinPeriod;
+  int32_t mMaxPeriod;
+  SensorsTriggerMode mTriggerMode;
+  SensorsDeliveryMode mDeliveryMode;
+};
+
+/**
+ * |SensorClass| represents the status of a specific sensor type.
+ */
+struct SensorsSensorClass {
+  SensorsSensorClass()
+    : mActivated(0)
+    , mMinValue(0)
+    , mMaxValue(0)
+  { }
+
+  void UpdateFromSensor(const SensorsSensor& aSensor)
+  {
+    mMaxValue = std::max(aSensor.mRange, mMaxValue);
+  }
+
+  uint32_t mActivated;
+  float mMinValue;
+  float mMaxValue;
+};
+
+} // namespace hal
+} // namespace mozilla
+
+#endif // hal_gonk_SensorsTypes_h