xilinx gpio in kernel 2.6

Mirek23 miroslaw.dach at psi.ch
Wed Jul 11 01:52:20 EST 2007

Hi All,

 After some time I have found the way how to deal with GPIO driver from the
user space:

First you have to mknod xgpio under /dev :
crw-rw-rw-    1 root     root      10, 185 Jun  1 13:59 /dev/xgpio

Example program below shows how to read from the GPIO channel.
To write to the channel change the call:
ioctl(fgpio,XGPIO_IN,&sGpioData); to ioctl(fgpio,XGPIO_OUT,&sGpioData);

#include <stdlib.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <fcntl.h>

#include <linux/xgpio_ioctl.h>


  int fgpio =0;
  struct xgpio_ioctl_data sGpioData;
    /* {
        __u32 device;
        __u32 mask;
        __u32 data;

  sGpioData.device=0; /* N=0,1,2,3-> GPIO DEV NR   2*N   (Lower 32 bit part
                                                   2*N+1 (Upper 32 bit part

fgpio = open ("/dev/xgpio",O_RDWR);
 if( fgpio != -1){

   ioctl(fgpio,XGPIO_IN,&sGpioData);//pointer here to  xgpio_ioctl_data
   printf("Dip Swich readout 0x%X\n",sGpioData.data);
   printf("Can not open GPIO\n");

}// end main


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