Digital Input

Trying to do DIO with the parallel port. I've got comedi setup and installed 
and can do output no problem. However, when I try to do input, i always get 
one, regardless of the voltage on the line. Any ideas? Here is the test 
program I am using.



#include <stdio.h>
#include <comedilib.h>

int subdev = 0;
int chan = 0;
int range = 0;
int aref = AREF_GROUND;

int main(int argc, char *argv[])
{
comedi_t *it;
lsampl_t data;
unsigned int in;

it = comedi_open("/dev/comedi0");

comedi_dio_config(it, 0, 0, COMEDI_INPUT);

comedi_dio_read(it, 0, 0, &in);

printf("%d\n", in);

return 0;
}


Also, is the dio on the parallel port set by channel or subdevice. Can I 
have channel 0 be input, channel 1 be output,etc? 


Thanks,
Matt Kubilus