Adding MacBook Pro accelerometer support.

chrome/browser/device_orientation/accelerometer_mac.h

+// Copyright (c) 2010 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.

[Steve Block, 2012/03/19 14:33:36]

We should probably move this third-party code to
third_party/sudden_motion_sensor, so we can provide a LICENSE file and include
the text in about:credits. See
http://www.chromium.org/developers/adding-3rd-party-libraries.

+//
+// - 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 CHROME_BROWSER_DEVICE_ORIENTATION_ACCELEROMETER_MAC_H_
+#define CHROME_BROWSER_DEVICE_ORIENTATION_ACCELEROMETER_MAC_H_
+#pragma once
+
+#include <vector>
+
+#include <IOKit/IOKitLib.h>
+
+#include "chrome/browser/device_orientation/data_fetcher.h"
+
+namespace device_orientation {
+
+// Provides an easy-to-use interface to retrieve data
+// from the MacBook family accelerometer.
+class AccelerometerMac : public DataFetcher {
+ public:
+  static DataFetcher* Create();
+
+  // Implement DataFetcher.
+  virtual bool GetOrientation(Orientation* orientation);
+
+  virtual ~AccelerometerMac();
+
+ private:
+  AccelerometerMac();
+  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 SensorDescriptor;
+  struct AxisData;
+
+  // List of supported sensors.
+  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_;
+};
+
+}  // namespace device_orientation
+
+#endif  // CHROME_BROWSER_DEVICE_ORIENTATION_ACCELEROMETER_MAC_H_