lib/filler.c

   1 /*
   2     lib/filler.c
   3     comedi library routines
   4
   5     COMEDI - Linux Control and Measurement Device Interface
   6     Copyright (C) 1997-8 David A. Schleef <ds@stm.lbl.gov>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 */
  23
  24 #include <stdio.h>
  25 #include <math.h>
  26 #include <stdlib.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <fcntl.h>
  30 #include <unistd.h>
  31 #include <sys/ioctl.h>
  32 #include <errno.h>
  33 #include <comedi.h>
  34 #include <string.h>
  35
  36 #include <libinternal.h>
  37
  38
  39 /* these functions download information from the comedi module. */
  40
  41
  42
  43 int get_subdevices(comedi_t *it)
  44 {
  45         int i,j;
  46         int ret;
  47         comedi_subdinfo *s;
  48         subdevice *r;
  49
  50         s=malloc(sizeof(comedi_subdinfo)*it->n_subdevices);
  51         ret=ioctl_subdinfo(it->fd,s);
  52         debug_int(ret);
  53
  54         r=it->subdevices=realloc(it->subdevices,
  55                 sizeof(subdevice)*it->n_subdevices);
  56         debug_ptr(r);
  57         memset(r,0,sizeof(subdevice)*it->n_subdevices);
  58
  59         for(i=0;i<it->n_subdevices;i++){
  60                 r[i].type       = s[i].type;
  61                 if(r[i].type==COMEDI_SUBD_UNUSED)continue;
  62                 r[i].n_chan     = s[i].n_chan;
  63                 r[i].subd_flags = s[i].subd_flags;
  64                 r[i].timer_type = s[i].timer_type;
  65                 r[i].len_chanlist = s[i].len_chanlist;
  66                 r[i].maxdata    = s[i].maxdata;
  67                 r[i].flags      = s[i].flags;
  68                 r[i].range_type = s[i].range_type;
  69
  70                 if(r[i].subd_flags&SDF_FLAGS){
  71                         r[i].flags_list=malloc(sizeof(*r[i].flags_list)*r[i].n_chan);
  72                         debug_ptr(r[i].flags_list);
  73                 }
  74                 if(r[i].subd_flags&SDF_MAXDATA){
  75                         r[i].maxdata_list=malloc(sizeof(*r[i].maxdata_list)*r[i].n_chan);
  76                         debug_ptr(r[i].maxdata_list);
  77                 }
  78                 if(r[i].subd_flags&SDF_RANGETYPE){
  79                         r[i].range_type_list=malloc(sizeof(*r[i].range_type_list)*r[i].n_chan);
  80                         debug_ptr(r[i].range_type_list);
  81                 }
  82                 ret=ioctl_chaninfo(it->fd,i,r[i].maxdata_list,r[i].flags_list,r[i].range_type_list);
  83                 debug_int(ret);
  84
  85                 if(r[i].subd_flags&SDF_RANGETYPE){
  86                         r[i].rangeinfo_list=malloc(sizeof(*r[i].rangeinfo_list)*r[i].n_chan);
  87                         debug_ptr(r[i].rangeinfo_list);
  88                         for(j=0;j<r[i].n_chan;j++){
  89                                 r[i].rangeinfo_list[j]=get_rangeinfo(it->fd,r[i].range_type_list[j]);
  90                         }
  91                 }else{
  92                         r[i].rangeinfo=get_rangeinfo(it->fd,r[i].range_type);
  93                 }
  94         }
  95
  96         free(s);
  97
  98         return 0;
  99 }
 100
 101 comedi_range *get_rangeinfo(int fd,unsigned int range_type)
 102 {
 103         comedi_krange *kr;
 104         comedi_range *r;
 105         int i;
 106
 107         kr=malloc(sizeof(comedi_krange)*RANGE_LENGTH(range_type));
 108         r=malloc(sizeof(comedi_range)*RANGE_LENGTH(range_type));
 109
 110         ioctl_rangeinfo(fd,range_type,kr);
 111
 112         for(i=0;i<RANGE_LENGTH(range_type);i++){
 113                 r[i].min=kr[i].min*1e-6;
 114                 r[i].max=kr[i].max*1e-6;
 115                 r[i].unit=RF_UNIT(kr[i].flags);
 116         }
 117         free(kr);
 118
 119         return r;
 120 }
 121
 122