uinput-mapper/map.c
2012-12-03 22:33:35 +01:00

216 lines
4.9 KiB
C

/*
* Status:
*
* - Can map keys from some keyboard to keys on a joystick.
*
* Does not:
* - Show up as a joystick device?
* - Emulate multiple joysticks
* - Have a nice mapping file format / datastructures YET.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <linux/input.h>
#include <linux/uinput.h>
#define INPUT_PATH "/dev/input/by-path/platform-i8042-serio-0-event-kbd"
/*#define INPUT_PATH "/dev/input/by-path/platform-i8042-serio-0-event-kbd"*/
#define UINPUT_PATH "/dev/uinput"
/* Reverse mapping, for later use */
static const struct _key_to_str {
char *name;
int num;
} key_map[] = {
#define DEF_KEY(NAME) \
{#NAME,NAME},
#include "def_keys.h"
{NULL, -1}
};
static int get_key_num(char* name)
{
int i = 0;
while (key_map[i].name) {
if (!strcmp(key_map[i].name, name))
return key_map[i].num;
i++;
}
return -1;
}
/* TODO:
* - Use atexit() to free joysticks
* - Add file parsing / reading
* - Add proper datastructures to keep track
*/
int main(int argc, char** argv) {
int i, nowrite;
int in, uin; /* fds */
struct input_event e, je;
struct uinput_user_dev uidev;
/*
* KEY_LEFT -> ABS_HAT0X
* KEY_RIGHT -> ABS_HAT0X
* KEY_UP -> ABS_HAT0Y
* KEY_DOWN -> ABS_HAT0Y
*
* KEY_LEFTCTRL -> BTN_0
* KEY_LEFTALT -> BTN_1
* KEY_SPACE -> BTN_2
*
* KEY_1 -> BTN_3
*/
int abskeyevs[] = {
ABS_HAT0X,
ABS_HAT0Y,
0
};
int evkeys[] = {
BTN_JOYSTICK,
BTN_0,
BTN_1,
BTN_2,
BTN_3,
0
};
/* Open input and uinput */
in = open(INPUT_PATH, O_RDONLY);
if(in < 0) {
perror("open in");
return 1;
}
uin = open(UINPUT_PATH, O_WRONLY | O_NONBLOCK);
if (uin < 0) {
perror("open uin");
return 2;
}
/* Register device opts */
if (ioctl(uin, UI_SET_EVBIT, EV_ABS) < 0) {
perror("ioctl EV_ABS");
return 1;
}
if (ioctl(uin, UI_SET_EVBIT, EV_KEY) < 0) {
perror("ioctl EV_KEY");
return 1;
}
/* Every ``button'' needs to be registered */
i = 0;
while(abskeyevs[i] != 0) {
if (ioctl(uin, UI_SET_ABSBIT, abskeyevs[i]) < 0) {
perror("ioctl dynamic");
return 1;
}
i++;
}
i = 0;
while(evkeys[i] != 0) {
if (ioctl(uin, UI_SET_KEYBIT, evkeys[i]) < 0) {
perror("ioctl dynamic 2");
return 1;
}
i++;
}
/* Allocate device info */
memset(&uidev, '\0', sizeof(struct uinput_user_dev));
snprintf(uidev.name, UINPUT_MAX_NAME_SIZE, "key2joy:1");
uidev.id.bustype = BUS_USB;
uidev.id.vendor = 0x42;
uidev.id.product = 0xbebe;
uidev.id.version = 1;
if (write(uin, &uidev, sizeof(uidev)) < 0) {
perror("write");
return -1;
}
if (ioctl(uin, UI_DEV_CREATE)) {
perror("ioctl create");
return 1;
}
/* Do it! */
while (1) {
if (read(in, &e, sizeof(struct input_event))) {
printf("Event: (Type: %d, Code: %d, Value %d)\n", e.type, e.code, e.value);
}
memset(&je, '\0', sizeof(struct input_event));
nowrite = 0;
if (e.type == EV_KEY) {
switch(e.code) {
case KEY_UP:
je.type = EV_ABS; je.code = ABS_HAT0Y; je.value = -e.value; break;
case KEY_DOWN:
je.type = EV_ABS; je.code = ABS_HAT0Y; je.value = e.value; break;
case KEY_LEFT:
je.type = EV_ABS; je.code = ABS_HAT0X; je.value = -e.value; break;
case KEY_RIGHT:
je.type = EV_ABS; je.code = ABS_HAT0X; je.value = e.value; break;
case KEY_LEFTCTRL:
je.type = EV_KEY; je.code = BTN_0; je.value = e.value; break;
case KEY_LEFTALT:
je.type = EV_KEY; je.code = BTN_1; je.value = e.value; break;
case KEY_SPACE:
je.type = EV_KEY; je.code = BTN_2; je.value = e.value; break;
case KEY_1:
je.type = EV_KEY; je.code = BTN_3; je.value = e.value; break;
default:
nowrite = 1;
}
if (nowrite == 0) {
if(write(uin, &je, sizeof(struct input_event)) < 0) {
perror("EV_ABS Write event");
return -1;
}
}
}
/* Synchronisation events */
if (e.type == EV_SYN) {
memset(&je, '\0', sizeof(struct input_event));
printf("SYN event\n");
je.type = EV_SYN;
je.code = 0;
je.value = 0;
if (write(uin, &je, sizeof(struct input_event)) < 0) {
perror("SYN write event");
return -1;
}
}
}
}