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/*****************************************************************************
* motion.c: laptop built-in motion sensors
*****************************************************************************
* Copyright (C) 2006 - 2012 the VideoLAN team
* $Id$
*
* Author: Sam Hocevar <sam@zoy.org>
* Jérôme Decoodt <djc@videolan.org> (unimotion integration)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <math.h>
#include <unistd.h>
#include <vlc_common.h>
#ifdef __APPLE__
# include "TargetConditionals.h"
# if !TARGET_OS_IPHONE
# define HAVE_MACOS_UNIMOTION
# endif
#endif
#ifdef HAVE_MACOS_UNIMOTION
# include "unimotion.h"
#endif
#include "motionlib.h"
struct motion_sensors_t
{
enum { HDAPS_SENSOR, AMS_SENSOR, APPLESMC_SENSOR,
UNIMOTION_SENSOR } sensor;
#ifdef HAVE_MACOS_UNIMOTION
enum sms_hardware unimotion_hw;
#endif
int i_calibrate;
int p_oldx[16];
int i;
int i_sum;
};
motion_sensors_t *motion_create( vlc_object_t *obj )
{
FILE *f;
int i_x = 0, i_y = 0;
motion_sensors_t *motion = malloc( sizeof( motion_sensors_t ) );
if( unlikely( motion == NULL ) )
{
return NULL;
}
if( access( "/sys/devices/platform/hdaps/position", R_OK ) == 0
&& ( f = fopen( "/sys/devices/platform/hdaps/calibrate", "re" ) ) )
{
/* IBM HDAPS support */
motion->i_calibrate = fscanf( f, "(%d,%d)", &i_x, &i_y ) == 2 ? i_x: 0;
fclose( f );
motion->sensor = HDAPS_SENSOR;
msg_Dbg( obj, "HDAPS motion detection correctly loaded" );
}
else if( access( "/sys/devices/ams/x", R_OK ) == 0 )
{
/* Apple Motion Sensor support */
motion->sensor = AMS_SENSOR;
msg_Dbg( obj, "AMS motion detection correctly loaded" );
}
else if( access( "/sys/devices/platform/applesmc.768/position", R_OK ) == 0
&& ( f = fopen( "/sys/devices/platform/applesmc.768/calibrate", "re" ) ) )
{
/* Apple SMC (newer macbooks) */
/* Should be factorised with HDAPS */
motion->i_calibrate = fscanf( f, "(%d,%d)", &i_x, &i_y ) == 2 ? i_x: 0;
fclose( f );
motion->sensor = APPLESMC_SENSOR;
msg_Dbg( obj, "Apple SMC motion detection correctly loaded" );
}
#ifdef HAVE_MACOS_UNIMOTION
else if( (motion->unimotion_hw = detect_sms()) )
{
motion->sensor = UNIMOTION_SENSOR;
msg_Dbg( obj, "UniMotion motion detection correctly loaded" );
}
#endif
else
{
/* No motion sensor support */
msg_Err( obj, "No motion sensor available" );
free( motion );
return NULL;
}
memset( motion->p_oldx, 0, sizeof( motion->p_oldx ) );
motion->i = 0;
motion->i_sum = 0;
return motion;
}
void motion_destroy( motion_sensors_t *motion )
{
free( motion );
}
/*****************************************************************************
* GetOrientation: get laptop orientation, range -1800 / +1800
*****************************************************************************/
static int GetOrientation( motion_sensors_t *motion )
{
FILE *f;
int i_x = 0, i_y = 0, i_z = 0;
int i_ret;
switch( motion->sensor )
{
case HDAPS_SENSOR:
f = fopen( "/sys/devices/platform/hdaps/position", "re" );
if( !f )
{
return 0;
}
i_ret = fscanf( f, "(%d,%d)", &i_x, &i_y );
fclose( f );
if( i_ret < 2 )
return 0;
else
return ( i_x - motion->i_calibrate ) * 10;
case AMS_SENSOR:
f = fopen( "/sys/devices/ams/x", "re" );
if( !f )
{
return 0;
}
i_ret = fscanf( f, "%d", &i_x);
fclose( f );
if( i_ret < 1 )
return 0;
else
return - i_x * 30; /* FIXME: arbitrary */
case APPLESMC_SENSOR:
f = fopen( "/sys/devices/platform/applesmc.768/position", "re" );
if( !f )
{
return 0;
}
i_ret = fscanf( f, "(%d,%d,%d)", &i_x, &i_y, &i_z );
fclose( f );
if( i_ret < 3 )
return 0;
else
return ( i_x - motion->i_calibrate ) * 10;
#ifdef HAVE_MACOS_UNIMOTION
case UNIMOTION_SENSOR:
if( read_sms_raw( motion->unimotion_hw, &i_x, &i_y, &i_z ) )
{
double d_norm = sqrt( i_x*i_x+i_z*i_z );
if( d_norm < 100 )
return 0;
double d_x = i_x / d_norm;
if( i_z > 0 )
return -asin(d_x)*3600/3.141;
else
return 3600 + asin(d_x)*3600/3.141;
}
else
return 0;
#endif
default:
vlc_assert_unreachable();
}
}
/*****************************************************************************
* motion_get_angle: get averaged laptop orientation, range -1800 / +1800
*****************************************************************************/
int motion_get_angle( motion_sensors_t *motion )
{
const int filter_length = ARRAY_SIZE( motion->p_oldx );
int i_x = GetOrientation( motion );
motion->i_sum += i_x - motion->p_oldx[motion->i];
motion->p_oldx[motion->i] = i_x;
motion->i = ( motion->i + 1 ) % filter_length;
i_x = motion->i_sum / filter_length;
return i_x;
}
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