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+/*
+ * Copyright (C) 2010 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_GRAVITY_SENSOR_H
+#define ANDROID_GRAVITY_SENSOR_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <gui/Sensor.h>
+
+#include "SensorDevice.h"
+#include "SensorInterface.h"
+#include "SecondOrderLowPassFilter.h"
+
+// ---------------------------------------------------------------------------
+namespace android {
+// ---------------------------------------------------------------------------
+
+class GravitySensor : public SensorInterface {
+ SensorDevice& mSensorDevice;
+ Sensor mAccelerometer;
+ bool mEnabled;
+ double mAccTime;
+
+ SecondOrderLowPassFilter mLowPass;
+ BiquadFilter mX, mY, mZ;
+
+public:
+ GravitySensor(sensor_t const* list, size_t count);
+ virtual bool process(sensors_event_t* outEvent,
+ const sensors_event_t& event);
+ virtual bool isEnabled() const;
+ virtual status_t activate(void* ident, bool enabled);
+ virtual status_t setDelay(void* ident, int handle, int64_t ns);
+ virtual Sensor getSensor() const;
+ virtual bool isVirtual() const { return true; }
+};
+
+// ---------------------------------------------------------------------------
+}; // namespace android
+
+#endif // ANDROID_GRAVITY_SENSOR_H