3 functions for setting calibration
5 Copyright (C) 2003 Frank Mori Hess <fmhess@users.sourceforge.net
7 This library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation, version 2.1
12 This library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with this library; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
28 #include <comedilib.h>
29 #include <libinternal.h>
31 static int check_cal_file( comedi_t *dev, struct calibration_file_contents *parsed_file )
33 if( strcmp( comedi_get_driver_name( dev ), parsed_file->driver_name ) )
35 COMEDILIB_DEBUG( 3, "driver name does not match '%s' from calibration file\n",
36 parsed_file->driver_name );
40 if( strcmp( comedi_get_board_name( dev ), parsed_file->board_name ) )
42 COMEDILIB_DEBUG( 3, "board name does not match '%s' from calibration file\n",
43 parsed_file->board_name );
50 static inline int valid_channel( struct calibration_file_contents *parsed_file,
51 unsigned int cal_index, unsigned int channel )
55 num_channels = parsed_file->calibrations[ cal_index ].num_channels;
56 if( num_channels == 0 ) return 1;
57 for( i = 0; i < num_channels; i++ )
59 if( parsed_file->calibrations[ cal_index ].channels[ i ] == channel )
66 static inline int valid_range( struct calibration_file_contents *parsed_file,
67 unsigned int cal_index, unsigned int range )
71 num_ranges = parsed_file->calibrations[ cal_index ].num_ranges;
72 if( num_ranges == 0 ) return 1;
73 for( i = 0; i < num_ranges; i++ )
75 if( parsed_file->calibrations[ cal_index ].ranges[ i ] == range )
82 static inline int valid_aref( struct calibration_file_contents *parsed_file,
83 unsigned int cal_index, unsigned int aref )
87 num_arefs = parsed_file->calibrations[ cal_index ].num_arefs;
88 if( num_arefs == 0 ) return 1;
89 for( i = 0; i < num_arefs; i++ )
91 if( parsed_file->calibrations[ cal_index ].arefs[ i ] == aref )
98 static int find_calibration( struct calibration_file_contents *parsed_file,
99 unsigned int subdev, unsigned int channel, unsigned int range, unsigned int aref )
103 num_cals = parsed_file->num_calibrations;
105 for( i = 0; i < num_cals; i++ )
107 if( parsed_file->calibrations[ i ].subdevice != subdev ) continue;
108 if( valid_range( parsed_file, i, range ) == 0 ) continue;
109 if( valid_channel( parsed_file, i, channel ) == 0 ) continue;
110 if( valid_aref( parsed_file, i, aref ) == 0 ) continue;
115 COMEDILIB_DEBUG( 3, "failed to find matching calibration\n" );
122 static int set_calibration( comedi_t *dev, struct calibration_file_contents *parsed_file,
123 unsigned int cal_index )
125 int i, retval, num_caldacs;
127 num_caldacs = parsed_file->calibrations[ cal_index ].num_caldacs;
128 COMEDILIB_DEBUG( 4, "num_caldacs %i\n", num_caldacs );
130 for( i = 0; i < num_caldacs; i++ )
132 struct caldac_setting caldac;
134 caldac = parsed_file->calibrations[ cal_index ].caldacs[ i ];
135 COMEDILIB_DEBUG( 4, "subdev %i, ch %i, val %i\n", caldac.subdevice,
136 caldac.channel,caldac.value);
137 retval = comedi_data_write( dev, caldac.subdevice, caldac.channel,
138 0, 0, caldac.value );
139 if( retval < 0 ) return retval;
145 EXPORT_SYMBOL(comedi_apply_calibration,0.7.20);
146 int comedi_apply_calibration( comedi_t *dev, unsigned int subdev, unsigned int channel,
147 unsigned int range, unsigned int aref, const char *cal_file_path )
149 struct stat file_stats;
150 char file_path[ 1024 ];
154 struct calibration_file_contents *parsed_file;
158 strncpy( file_path, cal_file_path, sizeof( file_path ) );
161 if( fstat( comedi_fileno( dev ), &file_stats ) < 0 )
163 COMEDILIB_DEBUG( 3, "failed to get file stats of comedi device file\n" );
167 snprintf( file_path, sizeof( file_path ), "/etc/comedi/calibrations/%s_0x%lx",
168 comedi_get_board_name( dev ),
169 ( unsigned long ) file_stats.st_ino );
172 cal_file = fopen( file_path, "r" );
173 if( cal_file == NULL )
175 COMEDILIB_DEBUG( 3, "failed to open file\n" );
179 parsed_file = parse_calibration_file( cal_file );
180 if( parsed_file == NULL )
182 COMEDILIB_DEBUG( 3, "failed to parse calibration file\n" );
188 retval = check_cal_file( dev, parsed_file );
191 cleanup_calibration_parse( parsed_file );
195 cal_index = find_calibration( parsed_file, subdev, channel, range, aref );
198 cleanup_calibration_parse( parsed_file );
202 retval = set_calibration( dev, parsed_file, cal_index );
205 cleanup_calibration_parse( parsed_file );