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 "libinternal.h"
30 static int set_calibration( comedi_t *dev, const comedi_calibration_t *parsed_file,
31 unsigned int cal_index );
33 static int check_cal_file( comedi_t *dev, const comedi_calibration_t *parsed_file )
35 if( strcmp( comedi_get_driver_name( dev ), parsed_file->driver_name ) )
37 COMEDILIB_DEBUG( 3, "driver name does not match '%s' from calibration file\n",
38 parsed_file->driver_name );
42 if( strcmp( comedi_get_board_name( dev ), parsed_file->board_name ) )
44 COMEDILIB_DEBUG( 3, "board name does not match '%s' from calibration file\n",
45 parsed_file->board_name );
52 static inline int valid_channel( const comedi_calibration_t *parsed_file,
53 unsigned int cal_index, unsigned int channel )
57 num_channels = parsed_file->settings[ cal_index ].num_channels;
58 if( num_channels == 0 ) return 1;
59 for( i = 0; i < num_channels; i++ )
61 if( parsed_file->settings[ cal_index ].channels[ i ] == channel )
68 static inline int valid_range( const comedi_calibration_t *parsed_file,
69 unsigned int cal_index, unsigned int range )
73 num_ranges = parsed_file->settings[ cal_index ].num_ranges;
74 if( num_ranges == 0 ) return 1;
75 for( i = 0; i < num_ranges; i++ )
77 if( parsed_file->settings[ cal_index ].ranges[ i ] == range )
84 static inline int valid_aref( const comedi_calibration_t *parsed_file,
85 unsigned int cal_index, unsigned int aref )
89 num_arefs = parsed_file->settings[ cal_index ].num_arefs;
90 if( num_arefs == 0 ) return 1;
91 for( i = 0; i < num_arefs; i++ )
93 if( parsed_file->settings[ cal_index ].arefs[ i ] == aref )
100 static int apply_calibration( comedi_t *dev, const comedi_calibration_t *parsed_file,
101 unsigned int subdev, unsigned int channel, unsigned int range, unsigned int aref )
103 int num_cals, i, retval;
106 num_cals = parsed_file->num_settings;
108 for( i = 0; i < num_cals; i++ )
110 if( parsed_file->settings[ i ].subdevice != subdev ) continue;
111 if( valid_range( parsed_file, i, range ) == 0 ) continue;
112 if( valid_channel( parsed_file, i, channel ) == 0 ) continue;
113 if( valid_aref( parsed_file, i, aref ) == 0 ) continue;
115 retval = set_calibration( dev, parsed_file, i );
116 if( retval < 0 ) return retval;
121 COMEDILIB_DEBUG( 3, "failed to find matching calibration\n" );
128 static int set_calibration( comedi_t *dev, const comedi_calibration_t *parsed_file,
129 unsigned int cal_index )
131 int i, retval, num_caldacs;
133 num_caldacs = parsed_file->settings[ cal_index ].num_caldacs;
134 COMEDILIB_DEBUG( 4, "num_caldacs %i\n", num_caldacs );
136 for( i = 0; i < num_caldacs; i++ )
138 comedi_caldac_t caldac;
140 caldac = parsed_file->settings[ cal_index ].caldacs[ i ];
141 COMEDILIB_DEBUG( 4, "subdev %i, ch %i, val %i\n", caldac.subdevice,
142 caldac.channel,caldac.value);
143 retval = comedi_data_write( dev, caldac.subdevice, caldac.channel,
144 0, 0, caldac.value );
145 if( retval < 0 ) return retval;
151 EXPORT_ALIAS_DEFAULT(_comedi_apply_parsed_calibration,comedi_apply_parsed_calibration,0.7.20);
152 int _comedi_apply_parsed_calibration( comedi_t *dev, unsigned int subdev, unsigned int channel,
153 unsigned int range, unsigned int aref, const comedi_calibration_t *calibration )
157 retval = check_cal_file( dev, calibration );
158 if( retval < 0 ) return retval;
160 retval = apply_calibration( dev, calibration, subdev, channel, range, aref );
164 /* munge characters in board name that will cause problems with file paths */
165 static void fixup_board_name( char *name )
167 while( ( name = strchr( name, '/' ) ) )
168 if( name ) *name = '-';
171 EXPORT_ALIAS_DEFAULT(_comedi_get_default_calibration_path,comedi_get_default_calibration_path,0.7.20);
172 char* _comedi_get_default_calibration_path( comedi_t *dev )
174 struct stat file_stats;
176 char *board_name, *temp;
179 if( fstat( comedi_fileno( dev ), &file_stats ) < 0 )
181 COMEDILIB_DEBUG( 3, "failed to get file stats of comedi device file\n" );
185 driver_name = comedi_get_driver_name( dev );
186 if( driver_name == NULL )
190 temp = comedi_get_board_name( dev );
195 board_name = strdup( temp );
197 fixup_board_name( board_name );
198 asprintf( &file_path, "/etc/comedi/calibrations/%s_%s_comedi%li",
199 driver_name, board_name, ( unsigned long ) minor( file_stats.st_rdev ) );
205 EXPORT_ALIAS_DEFAULT(_comedi_apply_calibration,comedi_apply_calibration,0.7.20);
206 int _comedi_apply_calibration( comedi_t *dev, unsigned int subdev, unsigned int channel,
207 unsigned int range, unsigned int aref, const char *cal_file_path )
209 char file_path[ 1024 ];
211 comedi_calibration_t *parsed_file;
215 strncpy( file_path, cal_file_path, sizeof( file_path ) );
220 temp = comedi_get_default_calibration_path( dev );
221 if( temp == NULL ) return -1;
222 strncpy( file_path, temp, sizeof( file_path ) );
226 parsed_file = comedi_parse_calibration_file( file_path );
227 if( parsed_file == NULL )
229 COMEDILIB_DEBUG( 3, "failed to parse calibration file\n" );
233 retval = comedi_apply_parsed_calibration( dev, subdev, channel, range, aref, parsed_file );
235 comedi_cleanup_calibration( parsed_file );