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/*
* 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;
const char * device_file_name = "/dev/input/event0";
int i;
int gain = -1;
int autocenter = -1;
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 {
device_file_name = argv[i];
}
}
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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