LCOV - code coverage report
Current view: directory - dom/system/unix - nsDeviceMotionSystem.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 87 0 0.0 %
Date: 2012-06-02 Functions: 6 0 0.0 %

       1                 : /* ***** BEGIN LICENSE BLOCK *****
       2                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       3                 :  *
       4                 :  * The contents of this file are subject to the Mozilla Public License Version
       5                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       6                 :  * the License. You may obtain a copy of the License at
       7                 :  * http://www.mozilla.org/MPL/
       8                 :  *
       9                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      10                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      11                 :  * for the specific language governing rights and limitations under the
      12                 :  * License.
      13                 :  *
      14                 :  * The Original Code is mozilla.org code.
      15                 :  *
      16                 :  * The Initial Developer of the Original Code is
      17                 :  * Mozilla Corporation.
      18                 :  * Portions created by the Initial Developer are Copyright (C) 2009
      19                 :  * the Initial Developer. All Rights Reserved.
      20                 :  *
      21                 :  * Contributor(s):
      22                 :  *   Michael Ventnor <m.ventnor@gmail.com>
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : #include <unistd.h>
      39                 : 
      40                 : #include "mozilla/Util.h"
      41                 : 
      42                 : #include "nsDeviceMotionSystem.h"
      43                 : #include "nsIServiceManager.h"
      44                 : 
      45                 : using namespace mozilla;
      46                 : 
      47                 : typedef struct {
      48                 :   const char* mPosition;
      49                 :   const char* mCalibrate;
      50                 :   nsAccelerometerSystemDriver mToken;
      51                 : } AccelerometerData;
      52                 : 
      53                 : static const AccelerometerData gAccelerometers[] = {
      54                 :   // MacBook
      55                 :   {"/sys/devices/platform/applesmc.768/position",
      56                 :    "/sys/devices/platform/applesmc.768/calibrate",
      57                 :    eAppleSensor},
      58                 :   // Thinkpad
      59                 :   {"/sys/devices/platform/hdaps/position",
      60                 :    "/sys/devices/platform/hdaps/calibrate",
      61                 :    eIBMSensor},
      62                 :   // Maemo Fremantle
      63                 :   {"/sys/class/i2c-adapter/i2c-3/3-001d/coord",
      64                 :    NULL,
      65                 :    eMaemoSensor},
      66                 :   // HP Pavilion dv7
      67                 :   {"/sys/devices/platform/lis3lv02d/position",
      68                 :    "/sys/devices/platform/lis3lv02d/calibrate",
      69                 :    eHPdv7Sensor},
      70                 : };
      71                 : 
      72               0 : nsDeviceMotionSystem::nsDeviceMotionSystem() :
      73                 :   mPositionFile(NULL),
      74                 :   mCalibrateFile(NULL),
      75               0 :   mType(eNoSensor)
      76                 : {
      77               0 : }
      78                 : 
      79               0 : nsDeviceMotionSystem::~nsDeviceMotionSystem()
      80                 : {
      81               0 : }
      82                 : 
      83                 : void
      84               0 : nsDeviceMotionSystem::UpdateHandler(nsITimer *aTimer, void *aClosure)
      85                 : {
      86               0 :   nsDeviceMotionSystem *self = reinterpret_cast<nsDeviceMotionSystem *>(aClosure);
      87               0 :   if (!self) {
      88               0 :     NS_ERROR("no self");
      89               0 :     return;
      90                 :   }
      91                 : 
      92                 :   float xf, yf, zf;
      93                 : 
      94               0 :   switch (self->mType) {
      95                 :     case eAppleSensor:
      96                 :     {
      97                 :       int x, y, z, calibrate_x, calibrate_y;
      98               0 :       fflush(self->mCalibrateFile);
      99               0 :       rewind(self->mCalibrateFile);
     100                 : 
     101               0 :       fflush(self->mPositionFile);
     102               0 :       rewind(self->mPositionFile);
     103                 : 
     104               0 :       if (fscanf(self->mCalibrateFile, "(%d, %d)", &calibrate_x, &calibrate_y) <= 0)
     105               0 :         return;
     106                 : 
     107               0 :       if (fscanf(self->mPositionFile, "(%d, %d, %d)", &x, &y, &z) <= 0)
     108               0 :         return;
     109                 : 
     110                 :       // In applesmc:
     111                 :       // - the x calibration value is negated
     112                 :       // - a negative z actually means a correct-way-up computer
     113                 :       // - dividing by 255 gives us the intended value of -1 to 1
     114               0 :       xf = ((float)(x + calibrate_x)) / 255.0;
     115               0 :       yf = ((float)(y - calibrate_y)) / 255.0;
     116               0 :       zf = ((float)z) / -255.0;
     117               0 :       break;
     118                 :     }
     119                 :     case eIBMSensor:
     120                 :     {
     121                 :       int x, y, calibrate_x, calibrate_y;
     122               0 :       fflush(self->mCalibrateFile);
     123               0 :       rewind(self->mCalibrateFile);
     124                 : 
     125               0 :       fflush(self->mPositionFile);
     126               0 :       rewind(self->mPositionFile);
     127                 : 
     128               0 :       if (fscanf(self->mCalibrateFile, "(%d, %d)", &calibrate_x, &calibrate_y) <= 0)
     129               0 :         return;
     130                 : 
     131               0 :       if (fscanf(self->mPositionFile, "(%d, %d)", &x, &y) <= 0)
     132               0 :         return;
     133                 : 
     134               0 :       xf = ((float)(x - calibrate_x)) / 180.0;
     135               0 :       yf = ((float)(y - calibrate_y)) / 180.0;
     136               0 :       zf = 1.0f;
     137               0 :       break;
     138                 :     }
     139                 :     case eMaemoSensor:
     140                 :     {
     141                 :       int x, y, z;
     142               0 :       fflush(self->mPositionFile);
     143               0 :       rewind(self->mPositionFile);
     144                 : 
     145               0 :       if (fscanf(self->mPositionFile, "%d %d %d", &x, &y, &z) <= 0)
     146               0 :         return;
     147                 : 
     148               0 :       xf = ((float)x) / -1000.0;
     149               0 :       yf = ((float)y) / -1000.0;
     150               0 :       zf = ((float)z) / -1000.0;
     151               0 :       break;
     152                 :     }
     153                 :     case eHPdv7Sensor:
     154                 :     {
     155                 :       int x, y, z, calibrate_x, calibrate_y, calibrate_z;
     156               0 :       fflush(self->mCalibrateFile);
     157               0 :       rewind(self->mCalibrateFile);
     158                 : 
     159               0 :       fflush(self->mPositionFile);
     160               0 :       rewind(self->mPositionFile);
     161                 : 
     162               0 :       if (fscanf(self->mCalibrateFile, "(%d,%d,%d)", &calibrate_x, &calibrate_y, &calibrate_z) <= 0)
     163               0 :         return;
     164                 : 
     165               0 :       if (fscanf(self->mPositionFile, "(%d,%d,%d)", &x, &y, &z) <= 0)
     166               0 :         return;
     167                 : 
     168                 :       // Example data:
     169                 :       //
     170                 :       // Calibration (-4,0,51)
     171                 :       // flat on the table (-5,-2,50)
     172                 :       // Tilted on its left side (-60,0,-4)
     173                 :       // Tilted on its right side (51,1,-1)
     174                 :       // upside down (-2,3,-60)
     175                 :       //
     176                 :       // So assuming the calibration data shows the acceleration
     177                 :       // (1G) measured with the notebook laying flat on the table
     178                 :       // it would mean that our best bet, is to ignore the z-axis
     179                 :       // calibration...  We are still way off, but it's hard to
     180                 :       // see how to get better data without doing calibration with
     181                 :       // user intervention (like: Turn your notbook slowly around
     182                 :       // so every edge and the top and bottom points up in turn)
     183                 : 
     184               0 :       xf = ((float)(x - calibrate_x)) / 60.0;
     185               0 :       yf = ((float)(y - calibrate_y)) / 60.0;
     186               0 :       zf = ((float)(z)) / 60.0;
     187               0 :       break;
     188                 :     }
     189                 : 
     190                 :     case eNoSensor:
     191                 :     default:
     192               0 :       return;
     193                 :   }
     194                 : 
     195               0 :   self->DeviceMotionChanged(nsIDeviceMotionData::TYPE_ACCELERATION, xf, yf, zf );
     196                 : }
     197                 : 
     198               0 : void nsDeviceMotionSystem::Startup()
     199                 : {
     200                 :   // Accelerometers in Linux are used by reading a file (yay UNIX!), which is
     201                 :   // in a slightly different location depending on the driver.
     202               0 :   for (unsigned int i = 0; i < ArrayLength(gAccelerometers); i++) {
     203               0 :     if (!(mPositionFile = fopen(gAccelerometers[i].mPosition, "r")))
     204               0 :       continue;
     205                 : 
     206               0 :     mType = gAccelerometers[i].mToken;
     207               0 :     if (gAccelerometers[i].mCalibrate) {
     208               0 :       mCalibrateFile = fopen(gAccelerometers[i].mCalibrate, "r");
     209               0 :       if (!mCalibrateFile) {
     210               0 :         fclose(mPositionFile);
     211               0 :         mPositionFile = nsnull;
     212               0 :         return;
     213                 :       }
     214                 :     }
     215                 : 
     216               0 :     break;
     217                 :   }
     218                 : 
     219               0 :   if (mType == eNoSensor)
     220               0 :     return;
     221                 : 
     222               0 :   mUpdateTimer = do_CreateInstance("@mozilla.org/timer;1");
     223               0 :   if (mUpdateTimer)
     224               0 :     mUpdateTimer->InitWithFuncCallback(UpdateHandler,
     225                 :                                        this,
     226                 :                                        mUpdateInterval,
     227               0 :                                        nsITimer::TYPE_REPEATING_SLACK);
     228                 : }
     229                 : 
     230               0 : void nsDeviceMotionSystem::Shutdown()
     231                 : {
     232               0 :   if (mPositionFile) {
     233               0 :     fclose(mPositionFile);
     234               0 :     mPositionFile = nsnull;
     235                 :   }
     236                 : 
     237                 :   // Fun fact: writing to the calibrate file causes the
     238                 :   // driver to re-calibrate the accelerometer
     239               0 :   if (mCalibrateFile) {
     240               0 :     fclose(mCalibrateFile);
     241               0 :     mCalibrateFile = nsnull;
     242                 :   }
     243                 : 
     244               0 :   mType = eNoSensor;
     245                 : 
     246               0 :   if (mUpdateTimer) {
     247               0 :     mUpdateTimer->Cancel();
     248               0 :     mUpdateTimer = nsnull;
     249                 :   }
     250               0 : }
     251                 : 

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