124 lines
2.7 KiB
C
124 lines
2.7 KiB
C
/**
|
|
* Copyright 2021 Johannes Marbach
|
|
* SPDX-License-Identifier: GPL-3.0-or-later
|
|
*/
|
|
|
|
|
|
#include "uinput_device.h"
|
|
|
|
#include "../shared/log.h"
|
|
|
|
#include <linux/uinput.h>
|
|
#include <assert.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#if UINPUT_VERSION < 5
|
|
#error Buffyboard does not have support for uinput < 5
|
|
#endif
|
|
|
|
/**
|
|
* Static variables
|
|
*/
|
|
|
|
static int fd = -1;
|
|
struct input_event event;
|
|
|
|
|
|
/**
|
|
* Static prototypes
|
|
*/
|
|
|
|
/**
|
|
* Emit an event on the device.
|
|
* @param type event type
|
|
* @param code event code
|
|
* @param value event value
|
|
* @return true if emitting the event was succesful, false otherwise
|
|
*/
|
|
static bool uinput_device_emit(int type, int code, int value);
|
|
|
|
/**
|
|
* Emit a synchronisation event on the device
|
|
* @return true if emitting the event was succesful, false otherwise
|
|
*/
|
|
static bool uinput_device_synchronise();
|
|
|
|
|
|
/**
|
|
* Static functions
|
|
*/
|
|
|
|
static bool uinput_device_emit(int type, int code, int value) {
|
|
event.type = type;
|
|
event.code = code;
|
|
event.value = value;
|
|
event.input_event_sec = 0;
|
|
event.input_event_usec = 0;
|
|
|
|
if (write(fd, &event, sizeof(event)) != sizeof(event)) {
|
|
perror("Could not emit event");
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool uinput_device_synchronise() {
|
|
return uinput_device_emit(EV_SYN, SYN_REPORT, 0);
|
|
}
|
|
|
|
|
|
/**
|
|
* Public functions
|
|
*/
|
|
|
|
bool bb_uinput_device_init(const int * const keycodes, int num_keycodes) {
|
|
fd = open("/dev/uinput", O_WRONLY | O_NONBLOCK);
|
|
if (fd < 0) {
|
|
bbx_log(BBX_LOG_LEVEL_ERROR, "Could not open /dev/uinput");
|
|
return false;
|
|
}
|
|
|
|
if (ioctl(fd, UI_SET_EVBIT, EV_KEY) < 0) {
|
|
bbx_log(BBX_LOG_LEVEL_ERROR, "Could not set EVBIT for EV_KEY");
|
|
return false;
|
|
}
|
|
|
|
for (int i = 0; i < num_keycodes; ++i) {
|
|
if (ioctl(fd, UI_SET_KEYBIT, keycodes[i]) < 0) {
|
|
bbx_log(BBX_LOG_LEVEL_ERROR, "Could not set KEYBIT");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static_assert(sizeof("buffyboard") <= UINPUT_MAX_NAME_SIZE);
|
|
|
|
struct uinput_setup usetup = { 0 };
|
|
usetup.id.bustype = BUS_VIRTUAL;
|
|
strcpy(usetup.name, "buffyboard");
|
|
|
|
if (ioctl(fd, UI_DEV_SETUP, &usetup) < 0) {
|
|
bbx_log(BBX_LOG_LEVEL_ERROR, "Could not set up uinput device");
|
|
return false;
|
|
}
|
|
|
|
if (ioctl(fd, UI_DEV_CREATE) < 0) {
|
|
bbx_log(BBX_LOG_LEVEL_ERROR, "Could not create uinput device");
|
|
return false;
|
|
}
|
|
|
|
memset(&event, 0, sizeof(event));
|
|
|
|
return true;
|
|
}
|
|
|
|
bool bb_uinput_device_emit_key_down(int keycode) {
|
|
return uinput_device_emit(EV_KEY, keycode, 1) && uinput_device_synchronise();
|
|
}
|
|
|
|
bool bb_uinput_device_emit_key_up(int keycode) {
|
|
return uinput_device_emit(EV_KEY, keycode, 0) && uinput_device_synchronise();
|
|
}
|