drivers/staging/comedi/drivers/pcm_common.c

   1 #include "../comedidev.h"
   2
   3 #include "comedi_fc.h"
   4 #include "pcm_common.h"
   5
   6 int comedi_pcm_cmdtest(struct comedi_device *dev,
   7                        struct comedi_subdevice *s, struct comedi_cmd *cmd)
   8 {
   9         int err = 0;
  10
  11         /* Step 1 : check if triggers are trivially valid */
  12
  13         err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_INT);
  14         err |= cfc_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
  15         err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_NOW);
  16         err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
  17         err |= cfc_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
  18
  19         if (err)
  20                 return 1;
  21
  22         /* Step 2a : make sure trigger sources are unique */
  23
  24         err |= cfc_check_trigger_is_unique(cmd->start_src);
  25         err |= cfc_check_trigger_is_unique(cmd->stop_src);
  26
  27         /* Step 2b : and mutually compatible */
  28
  29         if (err)
  30                 return 2;
  31
  32         /* Step 3: check if arguments are trivially valid */
  33
  34         err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
  35         err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
  36         err |= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);
  37         err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
  38
  39         switch (cmd->stop_src) {
  40         case TRIG_COUNT:
  41                 /* any count allowed */
  42                 break;
  43         case TRIG_NONE:
  44                 err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
  45                 break;
  46         default:
  47                 break;
  48         }
  49
  50         if (err)
  51                 return 3;
  52
  53         /* step 4: fix up any arguments */
  54
  55         /* if (err) return 4; */
  56
  57         return 0;
  58 }
  59 EXPORT_SYMBOL(comedi_pcm_cmdtest);
  60
  61 MODULE_AUTHOR("Comedi http://www.comedi.org");
  62 MODULE_DESCRIPTION("Comedi low-level driver");
  63 MODULE_LICENSE("GPL");