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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// This file is based on the SMSLib library.
//
// SMSLib Sudden Motion Sensor Access Library
// Copyright (c) 2010 Suitable Systems
// All rights reserved.
//
// Developed by: Daniel Griscom
// Suitable Systems
// http://www.suitable.com
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal with the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// - Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimers.
//
// - Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimers in the
// documentation and/or other materials provided with the distribution.
//
// - Neither the names of Suitable Systems nor the names of its
// contributors may be used to endorse or promote products derived from
// this Software without specific prior written permission.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR
// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE SOFTWARE.
//
// For more information about SMSLib, see
// <http://www.suitable.com/tools/smslib.html>
// or contact
// Daniel Griscom
// Suitable Systems
// 1 Centre Street, Suite 204
// Wakefield, MA 01880
// (781) 665-0053
#ifndef SUDDEN_MOTION_SENSOR_H_
#define SUDDEN_MOTION_SENSOR_H_
#pragma once
#include <vector>
#include <IOKit/IOKitLib.h>
// Provides an easy-to-use interface to retrieve data
// from the MacBook family accelerometer.
class SuddenMotionSensor {
public:
static SuddenMotionSensor* Create();
bool ReadSensorValues(float axes[3]);
~SuddenMotionSensor();
private:
SuddenMotionSensor();
bool Init();
// Extend the sign of an integer of size bytes to a 32-bit one.
static int ExtendSign(int value, size_t size);
struct GenericMacbookSensor;
struct SensorDescriptor;
struct AxisData;
// Generic sensor data and list of supported sensors.
static const GenericMacbookSensor kGenericSensor;
static const SensorDescriptor kSupportedSensors[];
// Local sensor if supported, else NULL.
const SensorDescriptor* sensor_;
// IOKit connection to the local sensor.
io_connect_t io_connection_;
// Input memory used for sensor I/O.
std::vector<char> input_record_;
// Output memory used for sensor I/O.
std::vector<char> output_record_;
};
#endif // SUDDEN_MOTION_SENSOR_H_
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