third_party/sudden_motion_sensor/sudden_motion_sensor_mac.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4 //
   5 // This file is based on the SMSLib library.
   6 //
   7 // SMSLib Sudden Motion Sensor Access Library
   8 // Copyright (c) 2010 Suitable Systems
   9 // All rights reserved.
  10 //
  11 // Developed by: Daniel Griscom
  12 //               Suitable Systems
  13 //               http://www.suitable.com
  14 //
  15 // Permission is hereby granted, free of charge, to any person obtaining a
  16 // copy of this software and associated documentation files (the
  17 // "Software"), to deal with the Software without restriction, including
  18 // without limitation the rights to use, copy, modify, merge, publish,
  19 // distribute, sublicense, and/or sell copies of the Software, and to
  20 // permit persons to whom the Software is furnished to do so, subject to
  21 // the following conditions:
  22 //
  23 // - Redistributions of source code must retain the above copyright notice,
  24 // this list of conditions and the following disclaimers.
  25 //
  26 // - Redistributions in binary form must reproduce the above copyright
  27 // notice, this list of conditions and the following disclaimers in the
  28 // documentation and/or other materials provided with the distribution.
  29 //
  30 // - Neither the names of Suitable Systems nor the names of its
  31 // contributors may be used to endorse or promote products derived from
  32 // this Software without specific prior written permission.
  33 //
  34 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  35 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  36 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  37 // IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR
  38 // ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  39 // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  40 // SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE SOFTWARE.
  41 //
  42 // For more information about SMSLib, see
  43 //    <http://www.suitable.com/tools/smslib.html>
  44 // or contact
  45 //    Daniel Griscom
  46 //    Suitable Systems
  47 //    1 Centre Street, Suite 204
  48 //    Wakefield, MA 01880
  49 //    (781) 665-0053
  50
  51 #ifndef SUDDEN_MOTION_SENSOR_H_
  52 #define SUDDEN_MOTION_SENSOR_H_
  53 #pragma once
  54
  55 #include <vector>
  56
  57 #include <IOKit/IOKitLib.h>
  58
  59 // Provides an easy-to-use interface to retrieve data
  60 // from the MacBook family accelerometer.
  61 class SuddenMotionSensor {
  62  public:
  63   static SuddenMotionSensor* Create();
  64   bool ReadSensorValues(float axes[3]);
  65   ~SuddenMotionSensor();
  66
  67  private:
  68   SuddenMotionSensor();
  69   bool Init();
  70
  71   // Extend the sign of an integer of size bytes to a 32-bit one.
  72   static int ExtendSign(int value, size_t size);
  73
  74   struct GenericMacbookSensor;
  75   struct SensorDescriptor;
  76   struct AxisData;
  77
  78   // Generic sensor data and list of supported sensors.
  79   static const GenericMacbookSensor kGenericSensor;
  80   static const SensorDescriptor kSupportedSensors[];
  81
  82   // Local sensor if supported, else NULL.
  83   const SensorDescriptor* sensor_;
  84
  85   // IOKit connection to the local sensor.
  86   io_connect_t io_connection_;
  87
  88   // Input memory used for sensor I/O.
  89   std::vector<char> input_record_;
  90
  91   // Output memory used for sensor I/O.
  92   std::vector<char> output_record_;
  93 };
  94
  95 #endif  // SUDDEN_MOTION_SENSOR_H_