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emulator.c
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emulator.c
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#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#include <argp.h>
#include <errno.h>
#include <fcntl.h>
#include <gtk/gtk.h>
#include <linux/input.h>
#include <linux/uinput.h>
#include <signal.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "keys.h"
#define GAMEPAD_NAME "Virtual Xbox Gamepad"
char *tooltip = GAMEPAD_NAME;
char *start_icon = "applications-games-symbolic";
char pathKeyboard[256] = "???";
char xaxis = 0;
char yaxis = 0;
char rxaxis = 0;
char ryaxis = 0;
bool verbose = false;
bool paused = false;
int grab = 1;
GtkStatusIcon *icon;
static int parse_opt(int key, char *arg, struct argp_state *state) {
switch (key) {
case 'k':
if (strlen(arg) < 256) strcpy(pathKeyboard, arg);
break;
case 'v':
verbose = true;
break;
}
return 0;
}
int parse_arguments(int argc, char **argv) {
struct argp_option options[] = {{"keyboard", 'k', "PATH", 0, "The path to keyboard (should look something like /dev/input/eventX)"},
{"verbose", 'v', 0, OPTION_ARG_OPTIONAL, "Show more info"},
{0}};
struct argp argp = {options, parse_opt};
return argp_parse(&argp, argc, argv, 0, 0, 0);
}
void exitFunc(int keyboard_fd, int gamepad_fd) {
printf("\nExiting.\n");
ioctl(keyboard_fd, EVIOCGRAB, 0); // Disable exclusive access
close(keyboard_fd); // Close keyboard
close(gamepad_fd); // Close gamepad
exit(EXIT_SUCCESS);
}
void send_sync_event(int gamepad_fd, struct input_event gamepad_event) {
memset(&gamepad_event, 0, sizeof(struct input_event));
gamepad_event.type = EV_SYN;
gamepad_event.code = 0;
gamepad_event.value = 0;
if (write(gamepad_fd, &gamepad_event, sizeof(struct input_event)) < 0) {
printf("Error writing sync event\n");
}
}
// TYPE Is The event to write to the gamepad and CODE is an integer value for
// the button on the gamepad
void send_event(int gamepad_fd, struct input_event gamepad_event, int TYPE, int CODE, int VALUE) {
memset(&gamepad_event, 0, sizeof(struct input_event));
gamepad_event.type = TYPE;
gamepad_event.code = CODE;
gamepad_event.value = VALUE;
if (write(gamepad_fd, &gamepad_event, sizeof(struct input_event)) < 0) {
printf("Error writing event to gamepad!\n");
} else if (verbose) {
printf("> Gamepad: type %d code %d value %d \n", gamepad_event.type, gamepad_event.code, gamepad_event.value);
}
}
void send_event_and_sync(int gamepad_fd, struct input_event gamepad_event, int TYPE, int CODE, int VALUE) {
send_event(gamepad_fd, gamepad_event, TYPE, CODE, VALUE);
send_sync_event(gamepad_fd, gamepad_event);
}
void tray_icon_on_click(int keyboard_fd, int gamepad_fd) { exitFunc(keyboard_fd, gamepad_fd); }
static GtkStatusIcon *create_tray_icon(char *start_icon, char *tooltip) {
GtkStatusIcon *tray_icon;
tray_icon = gtk_status_icon_new_from_icon_name(start_icon);
g_signal_connect(G_OBJECT(tray_icon), "activate", G_CALLBACK(tray_icon_on_click), NULL);
gtk_status_icon_set_visible(tray_icon, TRUE);
gtk_status_icon_set_tooltip_text(tray_icon, tooltip);
return tray_icon;
}
void waitReleaseAll(int fd) {
struct input_event evt;
unsigned char key_b[KEY_MAX / 8 + 1];
int i, nothing;
while (1) {
memset(key_b, 0, sizeof(key_b));
ioctl(fd, EVIOCGKEY(sizeof(key_b)), key_b);
for (nothing = 1, i = 0; i < KEY_MAX / 8 + 1; i++) {
if (key_b[i] != 0) {
nothing = 0;
break;
}
}
if (nothing) break;
read(fd, &evt, sizeof(evt));
}
if (verbose) printf("All keys are now released\n");
}
int main(int argc, char *argv[]) {
parse_arguments(argc, argv);
gtk_init(&argc, &argv);
icon = create_tray_icon(start_icon, tooltip);
sleep(1);
int rcode = 0;
char keyboard_name[256] = "Unknown";
int keyboard_fd = open(pathKeyboard, O_RDONLY | O_NONBLOCK);
if (keyboard_fd == -1) {
printf("Failed to open keyboard -> %s\n", pathKeyboard);
exit(1);
}
rcode = ioctl(keyboard_fd, EVIOCGNAME(sizeof(keyboard_name)), keyboard_name);
printf("Reading from: %s \n", keyboard_name);
printf("Getting exclusive access: ");
rcode = ioctl(keyboard_fd, EVIOCGRAB, 1);
printf("%s\n", (rcode == 0) ? "SUCCESS" : "FAILURE");
struct input_event keyboard_event;
// Now, create gamepad
int gamepad_fd = open("/dev/uinput", O_WRONLY | O_NONBLOCK);
if (gamepad_fd < 0) {
printf("Opening of input failed! \n");
return 1;
}
ioctl(gamepad_fd, UI_SET_EVBIT, EV_KEY); // setting Gamepad keys
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_A);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_B);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_X);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_Y);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_TL);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_TR);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_TL2);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_TR2);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_START);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_SELECT);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_MODE);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_THUMBL);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_THUMBR);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_DPAD_UP);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_DPAD_DOWN);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_DPAD_LEFT);
ioctl(gamepad_fd, UI_SET_KEYBIT, BTN_DPAD_RIGHT);
ioctl(gamepad_fd, UI_SET_EVBIT, EV_ABS); // setting Gamepad thumbsticks
ioctl(gamepad_fd, UI_SET_ABSBIT, ABS_X);
ioctl(gamepad_fd, UI_SET_ABSBIT, ABS_Y);
ioctl(gamepad_fd, UI_SET_ABSBIT, ABS_RX);
ioctl(gamepad_fd, UI_SET_ABSBIT, ABS_RY);
struct uinput_user_dev uidev;
memset(&uidev, 0, sizeof(uidev));
snprintf(uidev.name, UINPUT_MAX_NAME_SIZE, GAMEPAD_NAME); // Name of Gamepad
uidev.id.bustype = BUS_USB;
uidev.id.vendor = 0x45e;
uidev.id.product = 0x28e;
uidev.id.version = 0x110;
// Parameters of thumbsticks
uidev.absmax[ABS_X] = 32767;
uidev.absmin[ABS_X] = -32768;
uidev.absfuzz[ABS_X] = 0;
uidev.absflat[ABS_X] = 15;
uidev.absmax[ABS_Y] = 32767;
uidev.absmin[ABS_Y] = -32768;
uidev.absfuzz[ABS_Y] = 0;
uidev.absflat[ABS_Y] = 15;
uidev.absmax[ABS_RX] = 512;
uidev.absmin[ABS_RX] = -512;
uidev.absfuzz[ABS_RX] = 0;
uidev.absflat[ABS_RX] = 16;
uidev.absmax[ABS_RY] = 512;
uidev.absmin[ABS_RY] = -512;
uidev.absfuzz[ABS_RY] = 0;
uidev.absflat[ABS_RY] = 16;
if (write(gamepad_fd, &uidev, sizeof(uidev)) < 0) {
printf("Failed to write! \n");
return 1;
}
if (ioctl(gamepad_fd, UI_DEV_CREATE) < 0) {
printf("Failed to create gamepad! \n");
return 1;
}
sleep(0.6);
struct input_event gamepad_ev;
while (1) {
sleep(0.001);
gtk_main_iteration_do(FALSE);
if (read(keyboard_fd, &keyboard_event, sizeof(keyboard_event)) != -1) {
if (verbose) {
if (paused) printf("\n");
printf("> Keyboard: type %d code %d value %d \n", keyboard_event.type, keyboard_event.code, keyboard_event.value);
}
// Pause Gamepad Toggle (F2)
if (keyboard_event.code == KEY_F2 && keyboard_event.value == 0) {
grab = !grab;
paused = !paused;
if (paused) {
waitReleaseAll(gamepad_fd);
// Pause Icon
gtk_status_icon_set_from_icon_name(icon, "media-playback-pause-symbolic");
} else {
waitReleaseAll(keyboard_fd);
// Gamepad Icon
gtk_status_icon_set_from_icon_name(icon, "applications-games-symbolic");
}
ioctl(keyboard_fd, EVIOCGRAB, grab);
}
// Exit with F12 Key
if (keyboard_event.code == KEY_F12 && keyboard_event.value == 0) {
exitFunc(keyboard_fd, gamepad_fd);
break;
}
if (!paused) {
/* Face Buttons */
if (keyboard_event.value != 2) // only care about button press and not hold
{
switch (keyboard_event.code) {
case KEY_K:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_A, keyboard_event.value);
break;
case KEY_L:
case KEY_LEFTALT:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_B, keyboard_event.value);
break;
case KEY_J:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_X, keyboard_event.value);
break;
case KEY_I:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_Y, keyboard_event.value);
break;
case KEY_N:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_START, keyboard_event.value);
break;
case KEY_X:
case KEY_B:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_SELECT, keyboard_event.value);
break;
case KEY_ENTER:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_MODE, keyboard_event.value);
break;
}
}
/* Analog Sticks: Left & Right */
bool pressedOrHold = keyboard_event.value == 4 || keyboard_event.value == 1;
if (pressedOrHold) {
switch (keyboard_event.code) {
case KEY_W:
yaxis -= 1;
break;
case KEY_S:
yaxis += 1;
break;
case KEY_A:
xaxis -= 1;
break;
case KEY_D:
xaxis += 1;
break;
case KEY_1:
case KEY_8:
ryaxis -= 1;
break;
case KEY_2:
case KEY_9:
ryaxis += 1;
break;
case KEY_U:
rxaxis -= 1;
break;
case KEY_O:
rxaxis += 1;
break;
}
} else if (keyboard_event.value == 0) {
switch (keyboard_event.code) {
case KEY_W:
yaxis += 1;
break;
case KEY_S:
yaxis -= 1;
break;
case KEY_A:
xaxis += 1;
break;
case KEY_D:
xaxis -= 1;
break;
case KEY_1:
case KEY_8:
ryaxis += 1;
break;
case KEY_2:
case KEY_9:
ryaxis -= 1;
break;
case KEY_U:
rxaxis += 1;
break;
case KEY_O:
rxaxis -= 1;
break;
}
}
/* Left */
send_event_and_sync(gamepad_fd, gamepad_ev, EV_ABS, ABS_X, xaxis == 0 ? 0 : (xaxis == 1 ? 32767 : -32768));
send_event_and_sync(gamepad_fd, gamepad_ev, EV_ABS, ABS_Y, yaxis == 0 ? 0 : (yaxis == 1 ? 32767 : -32768));
/* Right */
send_event_and_sync(gamepad_fd, gamepad_ev, EV_ABS, ABS_RX, rxaxis == 0 ? 0 : (rxaxis == 1 ? 32767 : -32768));
send_event_and_sync(gamepad_fd, gamepad_ev, EV_ABS, ABS_RY, ryaxis == 0 ? 0 : (ryaxis == 1 ? 32767 : -32768));
switch (keyboard_event.code) {
/* TRIGGERS and BUMPERS */
case KEY_Q:
case KEY_R:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_TL, keyboard_event.value);
break;
case KEY_E:
case KEY_Y:
case KEY_LEFTSHIFT:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_TR, keyboard_event.value);
break;
case KEY_Z:
case KEY_4:
case KEY_SPACE:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_TL2, keyboard_event.value);
break;
case KEY_C:
case KEY_6:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_TR2, keyboard_event.value);
break;
/* L3 and R3 */
case KEY_5:
case KEY_TAB:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_THUMBL, keyboard_event.value);
break;
case KEY_V:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_THUMBR, keyboard_event.value);
break;
/* DPAD */
case KEY_T:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_DPAD_UP, keyboard_event.value);
break;
case KEY_G:
case KEY_DOT:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_DPAD_DOWN, keyboard_event.value);
break;
case KEY_F:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_DPAD_LEFT, keyboard_event.value);
break;
case KEY_H:
send_event_and_sync(gamepad_fd, gamepad_ev, EV_KEY, BTN_DPAD_RIGHT, keyboard_event.value);
break;
}
if (verbose) printf("\n");
} // paused
} // keyboard_fd
} // while
return 0;
} // main