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/*
libsuinput - thin userspace library on top of Linux uinput kernel module
Copyright (C) 2012 Tuomas Jorma Juhani Räsänen <tuomasjjrasanen@tjjr.fi>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <linux/limits.h>
#include <libudev.h>
#include "suinput.h"
int suinput_write_event(int uinput_fd, const struct input_event *event_p)
{
ssize_t bytes;
bytes = write(uinput_fd, event_p, sizeof(struct input_event));
if (bytes != sizeof(struct input_event)) {
return -1;
}
return 0;
}
int suinput_emit(int uinput_fd, uint16_t ev_type, uint16_t ev_code,
int32_t ev_value)
{
struct input_event event;
memset(&event, 0, sizeof(event));
gettimeofday(&event.time, 0);
event.type = ev_type;
event.code = ev_code;
event.value = ev_value;
return suinput_write_event(uinput_fd, &event);
}
int suinput_syn(int uinput_fd)
{
return suinput_emit(uinput_fd, EV_SYN, SYN_REPORT, 0);
}
static char *suinput_get_uinput_path(void)
{
struct udev *udev;
struct udev_device *udev_dev;
const char *devnode;
char *retval = NULL;
int orig_errno;
if ((udev = udev_new()) == NULL) {
return NULL;
}
udev_dev = udev_device_new_from_subsystem_sysname(udev, "misc",
"uinput");
if (udev_dev == NULL) {
goto out;
}
if ((devnode = udev_device_get_devnode(udev_dev)) == NULL) {
goto out;
}
if ((retval = malloc(strlen(devnode) + 1)) == NULL) {
goto out;
}
strcpy(retval, devnode);
out:
orig_errno = errno;
udev_device_unref(udev_dev);
udev_unref(udev);
errno = orig_errno;
return retval;
}
int suinput_open(void)
{
int uinput_fd;
char *uinput_path;
if ((uinput_path = suinput_get_uinput_path()) == NULL) {
return -1;
}
uinput_fd = open(uinput_path, O_WRONLY | O_NONBLOCK);
free(uinput_path);
return uinput_fd;
}
int suinput_create(int uinput_fd, const struct uinput_user_dev *user_dev_p)
{
ssize_t bytes;
bytes = write(uinput_fd, user_dev_p, sizeof(struct uinput_user_dev));
if (bytes != sizeof(struct uinput_user_dev)) {
return -1;
}
if (ioctl(uinput_fd, UI_DEV_CREATE) == -1) {
return -1;
}
return 0;
}
int suinput_destroy(int uinput_fd)
{
if (ioctl(uinput_fd, UI_DEV_DESTROY) == -1) {
int original_errno = errno;
close(uinput_fd);
errno = original_errno;
return -1;
}
return close(uinput_fd);
}
int suinput_enable_event(int uinput_fd, uint16_t ev_type, uint16_t ev_code)
{
unsigned long io;
if (ioctl(uinput_fd, UI_SET_EVBIT, ev_type) == -1) {
return -1;
}
switch (ev_type) {
case EV_KEY:
io = UI_SET_KEYBIT;
break;
case EV_REL:
io = UI_SET_RELBIT;
break;
case EV_ABS:
io = UI_SET_ABSBIT;
break;
case EV_MSC:
io = UI_SET_MSCBIT;
break;
case EV_SW:
io = UI_SET_SWBIT;
break;
case EV_LED:
io = UI_SET_LEDBIT;
break;
case EV_SND:
io = UI_SET_SNDBIT;
break;
case EV_FF:
io = UI_SET_FFBIT;
break;
default:
errno = EINVAL;
return -1;
}
return ioctl(uinput_fd, io, ev_code);
}
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