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ffset.c

/*
 * Tests the force feedback driver
 * Copyright 2001 Johann Deneux <deneux@ifrance.com>
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 *
 * You can contact the author by email at this address:
 * Johann Deneux <deneux@ifrance.com>
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/input.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char** argv)
{
      int fd;
      char device_file_name[64];
      int i;
      int gain = -1;
      int autocenter = -1;

      strncpy(device_file_name, "/dev/input/event0", 64);

      for (i=1; i<argc; ++i) {
            if (strcmp(argv[i], "--help") == 0) {
                  printf("Usage: %s /dev/input/eventXX [-g gain] [-a autocenter_strength]\n", argv[0]);
                  printf("Sets the gain and the autocenter of a force-feedback device\n");
                  printf("Values should belong to 0 to 100\n");
                  exit(1);
            }
            else if (strcmp(argv[i], "-g") == 0) {
                  if (++i >= argc) {
                        fprintf(stderr, "Missing gain value\n");
                        exit(1);
                  }
                  gain = atoi(argv[i]);
            }
            else if (strcmp(argv[i], "-a") == 0) {
                  if (++i >= argc) {
                        fprintf(stderr, "Missing auto-center value\n");
                        exit(1);
                  }
                  autocenter = atoi(argv[i]);
            }
            else {
                  strncpy(device_file_name, argv[i], 64);
            }
      }

      if (autocenter == -1 && gain == -1) {
            exit(0);
      }

      /* Open device */
      fd = open(device_file_name, O_RDWR);
      if (fd == -1) {
            perror("Open device file");
            exit(1);
      }
      printf("Device %s opened\n", device_file_name);

      if (autocenter >= 0 && autocenter <= 100) {
            struct input_event ie;
            ie.type = EV_FF;
            ie.code = FF_AUTOCENTER;
            ie.value = 0xFFFFUL * autocenter / 100;
            if (write(fd, &ie, sizeof(ie)) == -1)
                  perror("set auto-center");
      }

      if (gain >= 0 && gain <= 100) {
            struct input_event ie;
            ie.type = EV_FF;
            ie.code = FF_GAIN;
            ie.value = 0xFFFFUL * gain / 100;
            if (write(fd, &ie, sizeof(ie)) == -1)
                  perror("set gain");
      }

      exit(0);
}

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