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/*
* Axis and button map support functions.
* Copyright © 2009 Stephen Kitt <steve@sk2.org>
*
* 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.
*/
#include <errno.h>
#include <stdint.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <linux/input.h>
#include <linux/joystick.h>
#include "axbtnmap.h"
/* The following values come from include/joystick.h in the kernel source. */
#define JSIOCSBTNMAP_LARGE _IOW('j', 0x33, __u16[KEY_MAX_LARGE - BTN_MISC + 1])
#define JSIOCSBTNMAP_SMALL _IOW('j', 0x33, __u16[KEY_MAX_SMALL - BTN_MISC + 1])
#define JSIOCGBTNMAP_LARGE _IOR('j', 0x34, __u16[KEY_MAX_LARGE - BTN_MISC + 1])
#define JSIOCGBTNMAP_SMALL _IOR('j', 0x34, __u16[KEY_MAX_SMALL - BTN_MISC + 1])
int determine_ioctl(int fd, int *ioctls, int *ioctl_used, void *argp)
{
int i, retval = 0;
/* Try each ioctl in turn. */
for (i = 0; ioctls[i]; i++) {
if ((retval = ioctl(fd, ioctls[i], argp)) >= 0) {
/* The ioctl did something. */
*ioctl_used = ioctls[i];
return retval;
} else if (errno != -EINVAL) {
/* Some other error occurred. */
return retval;
}
}
return retval;
}
int getbtnmap(int fd, uint16_t *btnmap)
{
static int jsiocgbtnmap = 0;
int ioctls[] = { JSIOCGBTNMAP, JSIOCGBTNMAP_LARGE, JSIOCGBTNMAP_SMALL, 0 };
if (jsiocgbtnmap != 0) {
/* We already know which ioctl to use. */
return ioctl(fd, jsiocgbtnmap, btnmap);
} else {
return determine_ioctl(fd, ioctls, &jsiocgbtnmap, btnmap);
}
}
int setbtnmap(int fd, uint16_t *btnmap)
{
static int jsiocsbtnmap = 0;
int ioctls[] = { JSIOCSBTNMAP, JSIOCSBTNMAP_LARGE, JSIOCSBTNMAP_SMALL, 0 };
if (jsiocsbtnmap != 0) {
/* We already know which ioctl to use. */
return ioctl(fd, jsiocsbtnmap, btnmap);
} else {
return determine_ioctl(fd, ioctls, &jsiocsbtnmap, btnmap);
}
}
int getaxmap(int fd, uint8_t *axmap)
{
return ioctl(fd, JSIOCGAXMAP, axmap);
}
int setaxmap(int fd, uint8_t *axmap)
{
return ioctl(fd, JSIOCSAXMAP, axmap);
}
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