uinput-mapper/map.c

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/*
* Status:
*
* - Can map keys from some keyboard to keys on a joystick.
*
* Does not:
* - Have a nice mapping file format / datastructures YET.
*
*/
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
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#include <linux/input.h>
#include <linux/uinput.h>
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#include "config.h"
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#define UINPUT_PATH "/dev/uinput"
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/* 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;
}
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static int js[JOYCOUNT];
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/* TODO:
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* - Add file parsing / reading
* - Add proper datastructures to keep track
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*/
void free_js(int sig) {
int j;
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(void) sig;
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for(j = 0; j < JOYCOUNT; j++) {
printf("Freeing joystick: %d\n", j);
if (ioctl(js[j], UI_DEV_DESTROY) < 0) {
perror("Error freeing joystick");
}
close(js[j]);
}
exit(1);
}
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int main(int argc, char** argv) {
int j, nowrite;
int in; /* fds */
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struct input_event e, je;
struct uinput_user_dev uidev;
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(void)argc;
(void)argv;
(void)get_key_num;
if(signal(SIGINT, free_js)) {
printf("Atexit registration failed\n");
return 1;
}
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/* Open input and uinput */
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in = open(INPUT_PATH, O_RDONLY);
if(in < 0) {
perror("open in");
return 1;
}
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for(j = 0; j < JOYCOUNT; j++) {
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/* Memset because we are already setting the absmax/absmin */
memset(&uidev, '\0', sizeof(struct uinput_user_dev));
js[j] = open(UINPUT_PATH, O_WRONLY | O_NONBLOCK);
if (js[j] < 0) {
perror("open js[j]");
return 1;
}
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#define H_CONFIGURE_JOYSTICKS
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#include "config.h"
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/* Allocate device info */
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snprintf(uidev.name, UINPUT_MAX_NAME_SIZE, "key2joy:%d", j);
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uidev.id.bustype = BUS_USB;
uidev.id.vendor = 0x42;
uidev.id.product = 0xbebe;
uidev.id.version = 1;
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if (write(js[j], &uidev, sizeof(uidev)) < 0) {
perror("write");
return -1;
}
if (ioctl(js[j], UI_DEV_CREATE)) {
perror("ioctl create");
return 1;
}
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}
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/* Do it! */
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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);
}
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memset(&je, '\0', sizeof(struct input_event));
nowrite = 1;
j = 0;
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/* Only catch keys and ignore auto-repeat (value == 2) */
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/* TODO: Remove this EV_KEY contraint and use it in the macro */
#define H_JOYMAP
#include "config.h"
if (nowrite == 0) {
printf("Writing %d to %d\n", e.code, j);
if(write(js[j], &je, sizeof(struct input_event)) < 0) {
perror("Event write event");
return -1;
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}
}
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/* Synchronisation events */
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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(js[j], &je, sizeof(struct input_event)) < 0) {
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perror("SYN write event");
return -1;
}
}
}
}