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main.c
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main.c
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/* SPDX-License-Identifier: Unlicense
*/
#include <linux/uinput.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <stdbool.h>
#include <signal.h>
#include <inttypes.h>
// TODO Impl repeating key when right thumb-stick tilted enough in any way
// TODO Impl switching between keyboard and regular mode by BTN_MODE (the PS key)
/* Analog Binarization Threshold */
#define ABT 64
/* Analog Binarization Hysteresis */
#define ABH 20
enum mapping_type {
MT_SINGLE = 0,
MT_DOUBLE = 1,
MT_SINGLE_SINGLE = 2,
MT_DOUBLE_SINGLE = 3,
MT_SINGLE_DOUBLE = 4,
MT_DOUBLE_DOUBLE = 5,
};
enum side {
SIDE_NO = 0,
SIDE_LEFT = 1,
SIDE_RIGHT = 2,
};
struct mapping {
enum side first;
uint32_t keys;
uint16_t code;
};
enum keys_mask {
KMASK_LEFT = 1 << 0,
KMASK_RIGHT = 1 << 1,
KMASK_UP = 1 << 2,
KMASK_DOWN = 1 << 3,
KMASK_WEST = 1 << 4,
KMASK_EAST = 1 << 5,
KMASK_NORTH = 1 << 6,
KMASK_SOUTH = 1 << 7,
KMASK_LT = 1 << 8,
KMASK_LB = 1 << 9,
KMASK_RT = 1 << 10,
KMASK_RB = 1 << 11,
KMASK_OPTIONS = 1 << 12,
KMASK_SHARE = 1 << 13,
KMASK_PS = 1 << 14,
KMASK_THUMBL = 1 << 15,
KMASK_THUMBR = 1 << 16,
KMASK_THUMBL_DOWN = 1 << 17,
KMASK_THUMBL_UP = 1 << 18,
KMASK_THUMBL_LEFT = 1 << 19,
KMASK_THUMBL_RIGHT = 1 << 20,
KMASK_THUMBR_DOWN = 1 << 21,
KMASK_THUMBR_UP = 1 << 22,
KMASK_THUMBR_LEFT = 1 << 23,
KMASK_THUMBR_RIGHT = 1 << 24,
KMASK_PRESSED = 1 << 29,
KMASK_SIDE_SHIFT = 30,
KMASK_CHORD_KEYS =
KMASK_RIGHT | KMASK_LEFT | KMASK_UP | KMASK_DOWN | KMASK_WEST |
KMASK_EAST | KMASK_NORTH | KMASK_SOUTH,
};
struct state {
uint32_t keys; // keys_mask
bool keyboard_mode;
};
#define MAPPINGS_NUM 105
static struct mapping g_mapping[MAPPINGS_NUM] = {
/* Right single */
{ .first = SIDE_RIGHT, .keys = KMASK_WEST, .code = KEY_BACKSPACE },
{ .first = SIDE_RIGHT, .keys = KMASK_SOUTH, .code = KEY_ENTER },
{ .first = SIDE_RIGHT, .keys = KMASK_NORTH, .code = KEY_SPACE },
{ .first = SIDE_RIGHT, .keys = KMASK_EAST, .code = KEY_ESC },
/* Left single */
{ .first = SIDE_LEFT, .keys = KMASK_DOWN, .code = KEY_COMPOSE },
{ .first = SIDE_LEFT, .keys = KMASK_LEFT, .code = KEY_TAB },
{ .first = SIDE_LEFT, .keys = KMASK_UP, .code = KEY_DELETE},
{ .first = SIDE_LEFT, .keys = KMASK_RIGHT, .code = KEY_CAPSLOCK },
/* Right single to left single */
{ .first = SIDE_RIGHT, .keys = KMASK_WEST | KMASK_LEFT, .code = KEY_H },
{ .first = SIDE_RIGHT, .keys = KMASK_WEST | KMASK_DOWN, .code = KEY_J },
{ .first = SIDE_RIGHT, .keys = KMASK_WEST | KMASK_UP, .code = KEY_K },
{ .first = SIDE_RIGHT, .keys = KMASK_WEST | KMASK_RIGHT, .code = KEY_L },
{ .first = SIDE_RIGHT, .keys = KMASK_SOUTH | KMASK_LEFT, .code = KEY_G },
{ .first = SIDE_RIGHT, .keys = KMASK_SOUTH | KMASK_DOWN, .code = KEY_B },
{ .first = SIDE_RIGHT, .keys = KMASK_SOUTH | KMASK_UP, .code = KEY_N },
{ .first = SIDE_RIGHT, .keys = KMASK_SOUTH | KMASK_RIGHT, .code = KEY_M },
{ .first = SIDE_RIGHT, .keys = KMASK_NORTH | KMASK_LEFT, .code = KEY_O },
{ .first = SIDE_RIGHT, .keys = KMASK_NORTH | KMASK_DOWN, .code = KEY_P },
{ .first = SIDE_RIGHT, .keys = KMASK_NORTH | KMASK_UP, .code = KEY_LEFTBRACE },
{ .first = SIDE_RIGHT, .keys = KMASK_NORTH | KMASK_RIGHT, .code = KEY_RIGHTBRACE },
{ .first = SIDE_RIGHT, .keys = KMASK_EAST | KMASK_LEFT, .code = KEY_COMMA },
{ .first = SIDE_RIGHT, .keys = KMASK_EAST | KMASK_DOWN, .code = KEY_DOT },
{ .first = SIDE_RIGHT, .keys = KMASK_EAST | KMASK_UP, .code = KEY_SEMICOLON },
{ .first = SIDE_RIGHT, .keys = KMASK_EAST | KMASK_RIGHT, .code = KEY_APOSTROPHE },
/* Left single to right single */
{ .first = SIDE_LEFT, .keys = KMASK_LEFT | KMASK_WEST, .code = KEY_A },
{ .first = SIDE_LEFT, .keys = KMASK_LEFT | KMASK_SOUTH, .code = KEY_S },
{ .first = SIDE_LEFT, .keys = KMASK_LEFT | KMASK_NORTH, .code = KEY_D },
{ .first = SIDE_LEFT, .keys = KMASK_LEFT | KMASK_EAST, .code = KEY_F },
{ .first = SIDE_LEFT, .keys = KMASK_UP | KMASK_WEST, .code = KEY_Q },
{ .first = SIDE_LEFT, .keys = KMASK_UP | KMASK_SOUTH, .code = KEY_W },
{ .first = SIDE_LEFT, .keys = KMASK_UP | KMASK_NORTH, .code = KEY_E },
{ .first = SIDE_LEFT, .keys = KMASK_UP | KMASK_EAST, .code = KEY_R },
{ .first = SIDE_LEFT, .keys = KMASK_DOWN | KMASK_WEST, .code = KEY_Z },
{ .first = SIDE_LEFT, .keys = KMASK_DOWN | KMASK_SOUTH, .code = KEY_X },
{ .first = SIDE_LEFT, .keys = KMASK_DOWN | KMASK_NORTH, .code = KEY_C },
{ .first = SIDE_LEFT, .keys = KMASK_DOWN | KMASK_EAST, .code = KEY_V },
{ .first = SIDE_LEFT, .keys = KMASK_RIGHT | KMASK_WEST, .code = KEY_T },
{ .first = SIDE_LEFT, .keys = KMASK_RIGHT | KMASK_SOUTH, .code = KEY_Y },
{ .first = SIDE_LEFT, .keys = KMASK_RIGHT | KMASK_NORTH, .code = KEY_U },
{ .first = SIDE_LEFT, .keys = KMASK_RIGHT | KMASK_EAST, .code = KEY_I },
/* Right double to left single */
{ .first = SIDE_RIGHT, .keys = KMASK_WEST | KMASK_SOUTH | KMASK_LEFT, .code = KEY_F5 },
{ .first = SIDE_RIGHT, .keys = KMASK_WEST | KMASK_SOUTH | KMASK_UP, .code = KEY_F6 },
{ .first = SIDE_RIGHT, .keys = KMASK_WEST | KMASK_SOUTH | KMASK_DOWN, .code = KEY_F7 },
{ .first = SIDE_RIGHT, .keys = KMASK_WEST | KMASK_SOUTH | KMASK_RIGHT, .code = KEY_F8 },
{ .first = SIDE_RIGHT, .keys = KMASK_SOUTH | KMASK_EAST | KMASK_LEFT, .code = KEY_F9 },
{ .first = SIDE_RIGHT, .keys = KMASK_SOUTH | KMASK_EAST | KMASK_UP, .code = KEY_F10 },
{ .first = SIDE_RIGHT, .keys = KMASK_SOUTH | KMASK_EAST | KMASK_DOWN, .code = KEY_F11 },
{ .first = SIDE_RIGHT, .keys = KMASK_SOUTH | KMASK_EAST | KMASK_RIGHT, .code = KEY_F12 },
{ .first = SIDE_RIGHT, .keys = KMASK_NORTH | KMASK_WEST | KMASK_LEFT, .code = KEY_F1 },
{ .first = SIDE_RIGHT, .keys = KMASK_NORTH | KMASK_WEST | KMASK_UP, .code = KEY_F2 },
{ .first = SIDE_RIGHT, .keys = KMASK_NORTH | KMASK_WEST | KMASK_DOWN, .code = KEY_F3 },
{ .first = SIDE_RIGHT, .keys = KMASK_NORTH | KMASK_WEST | KMASK_RIGHT, .code = KEY_F4 },
{ .first = SIDE_RIGHT, .keys = KMASK_EAST | KMASK_NORTH | KMASK_LEFT, .code = KEY_HOME },
{ .first = SIDE_RIGHT, .keys = KMASK_EAST | KMASK_NORTH | KMASK_UP, .code = KEY_PAGEUP },
{ .first = SIDE_RIGHT, .keys = KMASK_EAST | KMASK_NORTH | KMASK_DOWN, .code = KEY_PAGEDOWN },
{ .first = SIDE_RIGHT, .keys = KMASK_EAST | KMASK_NORTH | KMASK_RIGHT, .code = KEY_END },
/* Left double to right single */
{ .first = SIDE_LEFT, .keys = KMASK_LEFT | KMASK_DOWN | KMASK_WEST, .code = KEY_5 },
{ .first = SIDE_LEFT, .keys = KMASK_LEFT | KMASK_DOWN | KMASK_SOUTH, .code = KEY_6 },
{ .first = SIDE_LEFT, .keys = KMASK_LEFT | KMASK_DOWN | KMASK_NORTH, .code = KEY_7 },
{ .first = SIDE_LEFT, .keys = KMASK_LEFT | KMASK_DOWN | KMASK_EAST, .code = KEY_8 },
{ .first = SIDE_LEFT, .keys = KMASK_UP | KMASK_LEFT | KMASK_WEST, .code = KEY_1 },
{ .first = SIDE_LEFT, .keys = KMASK_UP | KMASK_LEFT | KMASK_SOUTH, .code = KEY_2 },
{ .first = SIDE_LEFT, .keys = KMASK_UP | KMASK_LEFT | KMASK_NORTH, .code = KEY_3 },
{ .first = SIDE_LEFT, .keys = KMASK_UP | KMASK_LEFT | KMASK_EAST, .code = KEY_4 },
{ .first = SIDE_LEFT, .keys = KMASK_DOWN | KMASK_RIGHT | KMASK_WEST, .code = KEY_9 },
{ .first = SIDE_LEFT, .keys = KMASK_DOWN | KMASK_RIGHT | KMASK_SOUTH, .code = KEY_0 },
{ .first = SIDE_LEFT, .keys = KMASK_DOWN | KMASK_RIGHT | KMASK_NORTH, .code = KEY_MINUS },
{ .first = SIDE_LEFT, .keys = KMASK_DOWN | KMASK_RIGHT | KMASK_EAST, .code = KEY_EQUAL },
{ .first = SIDE_LEFT, .keys = KMASK_RIGHT | KMASK_UP | KMASK_WEST, .code = KEY_GRAVE },
{ .first = SIDE_LEFT, .keys = KMASK_RIGHT | KMASK_UP | KMASK_SOUTH, .code = KEY_BACKSLASH },
{ .first = SIDE_LEFT, .keys = KMASK_RIGHT | KMASK_UP | KMASK_NORTH, .code = KEY_SLASH },
// { .first = SIDE_LEFT, .keys = KMASK_RIGHT | KMASK_UP | KMASK_EAST, .code = KEY_ },
/* Right double to left double */
{ .first = SIDE_RIGHT, .keys = KMASK_EAST | KMASK_NORTH | KMASK_LEFT | KMASK_DOWN, .code = KEY_INSERT },
{ .first = SIDE_RIGHT, .keys = KMASK_EAST | KMASK_NORTH | KMASK_UP | KMASK_LEFT, .code = KEY_SCROLLLOCK },
{ .first = SIDE_RIGHT, .keys = KMASK_EAST | KMASK_NORTH | KMASK_DOWN | KMASK_RIGHT, .code = KEY_PAUSE },
{ .first = SIDE_RIGHT, .keys = KMASK_EAST | KMASK_NORTH | KMASK_RIGHT | KMASK_UP, .code = KEY_SYSRQ },
/* Implicily used modifiers and other keys that must be registered via ioctl(UI_SET_EVBIT) */
{ .first = SIDE_NO, .keys = 0, .code = KEY_LEFTSHIFT },
{ .first = SIDE_NO, .keys = 0, .code = KEY_RIGHTSHIFT },
{ .first = SIDE_NO, .keys = 0, .code = KEY_LEFTALT },
{ .first = SIDE_NO, .keys = 0, .code = KEY_RIGHTALT },
{ .first = SIDE_NO, .keys = 0, .code = KEY_LEFTCTRL },
{ .first = SIDE_NO, .keys = 0, .code = KEY_RIGHTCTRL },
{ .first = SIDE_NO, .keys = 0, .code = KEY_LEFTMETA },
{ .first = SIDE_NO, .keys = 0, .code = KEY_RIGHTMETA },
{ .first = SIDE_NO, .keys = 0, .code = KEY_LEFT },
{ .first = SIDE_NO, .keys = 0, .code = KEY_RIGHT },
{ .first = SIDE_NO, .keys = 0, .code = KEY_UP },
{ .first = SIDE_NO, .keys = 0, .code = KEY_DOWN },
};
static bool g_should_stop = false;
static int g_ifd = -1;
struct state g_state = {0};
static void grab(int ifd)
{
int ret = ioctl(ifd, EVIOCGRAB, (void *)1);
int err = errno;
if (ret != 0) {
fprintf(stderr, "Grab failed: ioctl(ifd, EVIOCGRAB, 1), err=%d: %s", err, strerror(err));
exit(1);
}
}
static void ungrab(int ifd)
{
int ret = ioctl(ifd, EVIOCGRAB, (void *)0);
int err = errno;
if (ret != 0) {
fprintf(stderr, "Ungrab failed: ioctl(ifd, EVIOCGRAB, 0), err=%d: %s", err, strerror(err));
exit(1);
}
}
static void sigint_handler(int _value)
{
(void) _value;
g_should_stop = true;
printf("Received SIGINT, quitting...\n");
if (g_state.keyboard_mode) {
int ret = ioctl(g_ifd, EVIOCGRAB, (void *)0);
if (ret != 0) {
fprintf(stderr, "Ungrab failed: ");
perror("ioctl(g_ifd, EVIOCGRAB, 0)");
exit(1);
}
}
// Set default handler and re-issue the signal to unblock the read(3p) call
signal(SIGINT, SIG_DFL);
kill(0, SIGINT);
}
static void setup_output_device(int fd)
{
/*
* The ioctls below will enable the device that is about to be
* created, to pass key events, in this case the space key.
*/
ioctl(fd, UI_SET_EVBIT, EV_KEY);
for (ssize_t i = 0; i < MAPPINGS_NUM; i++) {
if (-1 == ioctl(fd, UI_SET_KEYBIT, g_mapping[i].code)) {
fprintf(
stderr,
"ioctl(%d, UI_SET_KEYBIT, %u) = -1, errno=%d: ",
fd,
g_mapping[i].code,
errno);
perror("");
}
}
struct uinput_setup usetup;
memset(&usetup, 0, sizeof(usetup));
usetup.id.bustype = BUS_USB;
usetup.id.vendor = 0x1234; /* sample vendor */
usetup.id.product = 0x5678; /* sample product */
strcpy(usetup.name, "Example device");
ioctl(fd, UI_DEV_SETUP, &usetup);
ioctl(fd, UI_DEV_CREATE);
}
static void emit(int fd, int type, int code, int val, struct timeval timestamp)
{
struct input_event ie = {
.type = type,
.code = code,
.value = val,
.time = timestamp,
};
write(fd, &ie, sizeof(ie));
}
static void emulate_key_press(int ofd, int code, struct timeval timestamp)
{
emit(ofd, EV_KEY, code, 1, timestamp);
emit(ofd, EV_SYN, SYN_REPORT, 0, timestamp);
printf("-> EV_KEY, code=%u, value=%d\n", code, 1);
}
static void emulate_key_release(int ofd, int code, struct timeval timestamp)
{
emit(ofd, EV_KEY, code, 0, timestamp);
emit(ofd, EV_SYN, SYN_REPORT, 0, timestamp);
printf("-> EV_KEY, code=%u, value=%d\n", code, 0);
}
static void emulate_key(int ofd, int code, struct timeval timestamp)
{
emulate_key_press(ofd, code, timestamp);
emulate_key_release(ofd, code, timestamp);
}
static enum side which_side_key(struct input_event ev)
{
if (ev.type == EV_KEY) {
switch (ev.code) {
case BTN_SOUTH:
case BTN_EAST:
case BTN_WEST:
case BTN_NORTH:
return SIDE_RIGHT;
};
} else if (ev.type == EV_ABS) {
/*
* d-pad is EV_ABS
* left-right: code ABS_HAT0X, left=-1, right=1
* down-up: code ABS_HAT0Y, up=-1, down=1
*/
if (ev.code == ABS_HAT0X || ev.code == ABS_HAT0Y)
return SIDE_LEFT;
}
return SIDE_NO;
}
static enum side which_side_state(struct state state)
{
return (state.keys >> KMASK_SIDE_SHIFT) & 3;
}
static struct state release_all(int ofd, struct state state, struct timeval timestamp)
{
if (state.keys & KMASK_LT) {
emulate_key_release(ofd, KEY_LEFTCTRL, timestamp);
}
if (state.keys & KMASK_RT) {
emulate_key_release(ofd, KEY_LEFTSHIFT, timestamp);
}
if (state.keys & KMASK_LB) {
emulate_key_release(ofd, KEY_LEFTMETA, timestamp);
}
if (state.keys & KMASK_RB) {
emulate_key_release(ofd, KEY_LEFTALT, timestamp);
}
if (state.keys & KMASK_THUMBL_LEFT)
emulate_key_release(ofd, KEY_LEFT, timestamp);
else if (state.keys & KMASK_THUMBL_RIGHT)
emulate_key_release(ofd, KEY_RIGHT, timestamp);
if (state.keys & KMASK_THUMBL_UP)
emulate_key_release(ofd, KEY_UP, timestamp);
else if (state.keys & KMASK_THUMBL_DOWN)
emulate_key_release(ofd, KEY_DOWN, timestamp);
state.keys = 0;
return state;
}
static struct state keypress(struct state state, struct input_event ev, int ofd)
{
if (state.keyboard_mode == false) {
if (ev.type == EV_KEY && ev.code == BTN_MODE) {
state.keyboard_mode = true;
grab(g_ifd);
printf("Keyboard mode on\n");
}
return state;
}
printf("<- %s, code=%u, value=%d\n", ev.type == EV_KEY ? "EV_KEY" : "EV_ABS", ev.code, ev.value);
if (which_side_state(state) == SIDE_NO) {
const enum side side = which_side_key(ev);
printf("first = %s\n", side == SIDE_LEFT ? "left" : side == SIDE_RIGHT ? "right" : "no");
state.keys |= ((uint32_t)side & 3) << KMASK_SIDE_SHIFT;
}
if (ev.type == EV_KEY) {
switch (ev.code) {
case BTN_SOUTH:
state.keys |= KMASK_SOUTH;
state.keys |= KMASK_PRESSED;
break;
case BTN_EAST:
state.keys |= KMASK_EAST;
state.keys |= KMASK_PRESSED;
break;
case BTN_WEST:
state.keys |= KMASK_WEST;
state.keys |= KMASK_PRESSED;
break;
case BTN_NORTH:
state.keys |= KMASK_NORTH;
state.keys |= KMASK_PRESSED;
break;
case BTN_TL2:
// Control
if (state.keyboard_mode) {
state.keys |= KMASK_LT;
emulate_key_press(ofd, KEY_LEFTCTRL, ev.time);
}
break;
case BTN_TR2:
// Shift
if (state.keyboard_mode) {
state.keys |= KMASK_RT;
emulate_key_press(ofd, KEY_LEFTSHIFT, ev.time);
}
break;
case BTN_TL:
// Super
if (state.keyboard_mode) {
state.keys |= KMASK_LB;
emulate_key_press(ofd, KEY_LEFTMETA, ev.time);
}
break;
case BTN_TR:
// Alt
if (state.keyboard_mode) {
state.keys |= KMASK_RB;
emulate_key_press(ofd, KEY_LEFTALT, ev.time);
}
break;
case BTN_SELECT:
state.keys |= KMASK_SHARE;
break;
case BTN_START:
state.keys |= KMASK_OPTIONS;
break;
case BTN_MODE:
state.keyboard_mode = false;
state = release_all(ofd, state, ev.time);
ungrab(g_ifd);
printf("Keyboard mode off\n");
break;
};
} else if (state.keyboard_mode && ev.type == EV_ABS) {
/*
* d-pad is EV_ABS
* left-right: code ABS_HAT0X, left=-1, right=1
* down-up: code ABS_HAT0Y, up=-1, down=1
*/
if (ev.code == ABS_HAT0X) {
if (ev.value == -1) {
state.keys |= KMASK_LEFT;
state.keys |= KMASK_PRESSED;
} else if (ev.value == 1) {
state.keys |= KMASK_RIGHT;
state.keys |= KMASK_PRESSED;
}
} else if (ev.code == ABS_HAT0Y) {
if (ev.value == -1) {
state.keys |= KMASK_UP;
state.keys |= KMASK_PRESSED;
} else if (ev.value == 1) {
state.keys |= KMASK_DOWN;
state.keys |= KMASK_PRESSED;
}
} else if (ev.code == ABS_X) {
if (ev.value == -1) {
emulate_key_press(ofd, KEY_LEFT, ev.time);
state.keys |= KMASK_THUMBL_LEFT;
} else if (ev.value == 1) {
emulate_key_press(ofd, KEY_RIGHT, ev.time);
state.keys |= KMASK_THUMBL_RIGHT;
}
} else if (ev.code == ABS_Y) {
if (ev.value == -1) {
emulate_key_press(ofd, KEY_UP, ev.time);
state.keys |= KMASK_THUMBL_UP;
} else if (ev.value == 1) {
emulate_key_press(ofd, KEY_DOWN, ev.time);
state.keys |= KMASK_THUMBL_DOWN;
}
} else if (ev.code == ABS_RX) {
if (ev.value == -1) {
state.keys |= KMASK_THUMBR_LEFT;
} else if (ev.value == 1) {
state.keys |= KMASK_THUMBR_RIGHT;
}
} else if (ev.code == ABS_RY) {
if (ev.value == -1) {
state.keys |= KMASK_THUMBR_UP;
} else if (ev.value == 1) {
state.keys |= KMASK_THUMBR_DOWN;
}
}
}
return state;
}
static struct state keyrelease(struct state state, struct input_event ev, int ofd)
{
if (state.keyboard_mode == false) {
return state;
}
printf("<- %s, code=%u, value=%d\n", ev.type == EV_KEY ? "EV_KEY" : "EV_ABS", ev.code, ev.value);
if (state.keys & KMASK_PRESSED) {
for (ssize_t i = 0; i < MAPPINGS_NUM; i++) {
struct mapping mapping = g_mapping[i];
if (mapping.code && mapping.first == which_side_state(state) &&
(state.keys & KMASK_CHORD_KEYS) == mapping.keys) {
emulate_key(ofd, mapping.code, ev.time);
}
}
}
if (ev.type == EV_KEY) {
switch (ev.code) {
case BTN_SOUTH:
state.keys &= ~KMASK_SOUTH;
state.keys &= ~KMASK_PRESSED;
break;
case BTN_EAST:
state.keys &= ~KMASK_EAST;
state.keys &= ~KMASK_PRESSED;
break;
case BTN_WEST:
state.keys &= ~KMASK_WEST;
state.keys &= ~KMASK_PRESSED;
break;
case BTN_NORTH:
state.keys &= ~KMASK_NORTH;
state.keys &= ~KMASK_PRESSED;
break;
case BTN_TL2:
// Control
if (state.keys & KMASK_LT) {
emulate_key_release(ofd, KEY_LEFTCTRL, ev.time);
}
state.keys &= ~KMASK_LT;
break;
case BTN_TR2:
// Shift
if (state.keys & KMASK_RT) {
emulate_key_release(ofd, KEY_LEFTSHIFT, ev.time);
}
state.keys &= ~KMASK_RT;
break;
case BTN_TL:
// Super
if (state.keys & KMASK_LB) {
emulate_key_release(ofd, KEY_LEFTMETA, ev.time);
}
state.keys &= ~KMASK_LB;
break;
case BTN_TR:
// Alt
if (state.keys & KMASK_RB) {
emulate_key_release(ofd, KEY_LEFTALT, ev.time);
}
state.keys &= ~KMASK_RB;
break;
case BTN_SELECT:
state.keys &= ~KMASK_SHARE;
break;
case BTN_START:
state.keys &= ~KMASK_OPTIONS;
break;
case BTN_MODE:
break;
};
} else if (ev.type == EV_ABS) {
/*
* d-pad is EV_ABS
* left-right: code ABS_HAT0X, left=-1, right=1
* down-up: code ABS_HAT0Y, up=-1, down=1
*/
if (ev.code == ABS_HAT0X) {
state.keys &= ~(KMASK_LEFT | KMASK_RIGHT);
/* D-pad takes part in chords too */
state.keys &= ~KMASK_PRESSED;
} else if (ev.code == ABS_HAT0Y) {
state.keys &= ~(KMASK_UP | KMASK_DOWN);
/* D-pad takes part in chords too */
state.keys &= ~KMASK_PRESSED;
} else if (ev.code == ABS_X) {
if (state.keys & KMASK_THUMBL_LEFT)
emulate_key_release(ofd, KEY_LEFT, ev.time);
else if (state.keys & KMASK_THUMBL_RIGHT)
emulate_key_release(ofd, KEY_RIGHT, ev.time);
state.keys &= ~(KMASK_THUMBL_LEFT | KMASK_THUMBL_RIGHT);
} else if (ev.code == ABS_Y) {
if (state.keys & KMASK_THUMBL_UP)
emulate_key_release(ofd, KEY_UP, ev.time);
else if (state.keys & KMASK_THUMBL_DOWN)
emulate_key_release(ofd, KEY_DOWN, ev.time);
state.keys &= ~(KMASK_THUMBL_UP | KMASK_THUMBL_DOWN);
} else if (ev.code == ABS_RX) {
state.keys &= ~(KMASK_THUMBR_LEFT | KMASK_THUMBR_RIGHT);
} else if (ev.code == ABS_RY) {
state.keys &= ~(KMASK_THUMBR_UP | KMASK_THUMBR_DOWN);
}
}
if ((state.keys & ~(3 << KMASK_SIDE_SHIFT)) == 0) state.keys &= ~(3 << KMASK_SIDE_SHIFT);
return state;
}
int main(int argc, char *argv[])
{
if (argc < 2) {
fprintf(stderr, "Error: No input device specified\n");
exit(1);
}
const char *input_path = argv[1];
g_ifd = open(input_path, O_RDONLY);
if (g_ifd == -1) {
fprintf(stderr, "\"%s\": ", input_path);
perror("open");
exit(1);
}
int ofd = open("/dev/uinput", O_WRONLY);
if (ofd == -1) {
fprintf(stderr, "\"/dev/uinput\": ");
perror("open");
exit(1);
}
signal(SIGINT, sigint_handler);
setup_output_device(ofd);
int8_t abs_previous[ABS_CNT] = {0};
while (!g_should_stop) {
struct input_event ev;
ssize_t ret = read(g_ifd, &ev, sizeof(ev));
if (ret == -1) {
perror("read");
exit(1);
}
switch (ev.type) {
case EV_KEY:
if (ev.value == 1) {
g_state = keypress(g_state, ev, ofd);
} else if (ev.value == 0) {
g_state = keyrelease(g_state, ev, ofd);
}
break;
case EV_ABS:
/*
* d-pad is EV_ABS
* left-right: code ABS_HAT0X, left=-1, right=1
* down-up: code ABS_HAT0Y, up=-1, down=1
*/
if (ev.code == ABS_HAT0X || ev.code == ABS_HAT0Y) {
if (ev.value == 1 || ev.value == -1) {
g_state = keypress(g_state, ev, ofd);
} else if (ev.value == 0) {
g_state = keyrelease(g_state, ev, ofd);
}
} else if (ev.code == ABS_X || ev.code == ABS_Y || ev.code == ABS_RX || ev.code == ABS_RY) {
/*
* Center stick position is about 127 or 128 on any axis.
* Gonna convert these values to be consistent with d-pad
* "analog" values.
*/
if ((ev.value - INT8_MAX) > (ABT + ABH)) {
ev.value = 1;
} else if ((ev.value - INT8_MAX) < -(ABT + ABH)) {
ev.value = -1;
} else if (((ev.value - INT8_MAX) > -(ABT - ABH)) &&
((ev.value - INT8_MAX) < (ABT - ABH))) {
ev.value = 0;
} else {
break;
}
/* Some filtering with abs_previous to mitigate duplicate events */
if (abs_previous[ev.code] != ev.value) {
if (ev.value == 1 || ev.value == -1) {
if (abs_previous[ev.code] != 0) {
const int8_t value = ev.value;
ev.value = 0;
g_state = keyrelease(g_state, ev, ofd);
ev.value = value;
}
g_state = keypress(g_state, ev, ofd);
abs_previous[ev.code] = ev.value;
} else if (ev.value == 0) {
g_state = keyrelease(g_state, ev, ofd);
abs_previous[ev.code] = ev.value;
}
}
}
break;
default:
break;
}
}
ioctl(ofd, UI_DEV_DESTROY);
close(ofd);
return 0;
}