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uinput.c
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uinput.c
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///
/// @file uinput.c @brief linux uinput modul
///
/// Copyright (c) 2007,2009 by Lutz Sammer. All Rights Reserved.
///
/// Contributor(s):
///
/// This file is part of ALE one-hand keyboard
///
/// 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; only version 2 of the License.
///
/// 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.
///
/// $Id$
////////////////////////////////////////////////////////////////////////////
/// @defgroup uinput The uinput module.
///
/// Collection of uinput routines.
///
#include <linux/input.h>
#include <linux/uinput.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include "uinput.h"
///
/// Open uinput device
///
/// @param name name of the uinput device
///
/// @returns uinput file descriptor, -1 if failure.
///
int OpenUInput(const char *name)
{
int i;
int fd;
char buf[64];
struct uinput_user_dev device;
// open uinput device file
if ((fd = open("/dev/input/uinput", O_WRONLY)) < 0
&& (fd = open("/dev/misc/uinput", O_WRONLY)) < 0
&& (fd = open("/dev/uinput", O_WRONLY)) < 0) {
perror("open(/dev/.../uinput)");
return fd;
}
memset(&device, 0, sizeof(device));
// sets the name of our device
strncpy(device.name, name, UINPUT_MAX_NAME_SIZE);
// its bus
device.id.bustype = BUS_USB;
// and vendor id/product id/version
device.id.vendor = 0x414C;
device.id.product = 0x4F48;
device.id.version = 0x0001;
device.absmin[ABS_X] = 0;
device.absmin[ABS_Y] = 0;
device.absmax[ABS_X] = UINPUT_MAX_ABS_X;
device.absmax[ABS_Y] = UINPUT_MAX_ABS_Y;
device.absfuzz[ABS_X] = 4;
device.absfuzz[ABS_Y] = 4;
device.absflat[ABS_X] = 2;
device.absflat[ABS_Y] = 2;
// mouse emulation
//
// inform that we'll generate relative axis events
ioctl(fd, UI_SET_EVBIT, EV_REL);
ioctl(fd, UI_SET_EVBIT, EV_SYN);
ioctl(fd, UI_SET_RELBIT, REL_X);
ioctl(fd, UI_SET_RELBIT, REL_Y);
#if 1
// joystick/touchpad emulation
//
// inform that we'll generate absolute axis events
ioctl(fd, UI_SET_EVBIT, EV_ABS);
ioctl(fd, UI_SET_ABSBIT, ABS_X);
ioctl(fd, UI_SET_ABSBIT, ABS_Y);
//ioctl(fd, UI_SET_ABSBIT, ABS_PRESSURE);
ioctl(fd, UI_SET_KEYBIT, BTN_TOUCH);
#endif
// inform that we'll generate key events
ioctl(fd, UI_SET_EVBIT, EV_KEY);
// set key events we can generate (in this case, all)
for (i = 1; i < /*KEY_MAX */ 255; i++) {
ioctl(fd, UI_SET_KEYBIT, i);
}
ioctl(fd, UI_SET_KEYBIT, BTN_LEFT);
ioctl(fd, UI_SET_KEYBIT, BTN_RIGHT);
ioctl(fd, UI_SET_KEYBIT, BTN_MIDDLE);
// write down information for creating a new device
if (write(fd, &device, sizeof(struct uinput_user_dev)) < 0) {
perror("write");
close(fd);
return -1;
}
// set phys cookie
snprintf(buf, sizeof(buf), "aohkd-%04x:%04x", device.id.vendor,
device.id.product);
ioctl(fd, UI_SET_PHYS, buf);
// actually creates the device
if (ioctl(fd, UI_DEV_CREATE) < 0) {
perror("ioctl(UI_DEV_CREATE)");
close(fd);
return -1;
}
return fd;
}
///
/// Send keydown event
///
/// @param fd uinput file descriptor
/// @param code scancode
///
/// @returns -1 if failure
///
/// @see /usr/include/linux/input.h for possible scancodes.
///
int UInputKeydown(int fd, int code)
{
struct input_event event[2];
memset(&event, 0, sizeof(event));
event[0].type = EV_KEY;
event[0].code = code;
event[0].value = 1;
event[1].type = EV_SYN;
event[1].code = SYN_REPORT;
return write(fd, event, sizeof(event));
}
///
/// Send keyup event
///
/// @param fd uinput file descriptor
/// @param code scancode
///
/// @returns -1 if failure
///
/// @see /usr/include/linux/input.h for possible scancodes.
///
int UInputKeyup(int fd, int code)
{
struct input_event event[2];
memset(&event, 0, sizeof(event));
event[0].type = EV_KEY;
event[0].code = code;
// event[0].value = 0;
event[1].type = EV_SYN;
event[1].code = SYN_REPORT;
return write(fd, event, sizeof(event));
}
///
/// Send absolute x event
///
/// @param fd uinput file descriptor
/// @param x absolute x coordinate
///
/// @returns -1 if failure
///
int UInputAbsX(int fd, int x)
{
struct input_event event;
memset(&event, 0, sizeof(event));
event.type = EV_ABS;
event.code = ABS_X;
event.value = x;
return write(fd, &event, sizeof(event));
}
///
/// Send absolute y event
///
/// @param fd uinput file descriptor
/// @param y absolute y coordinate
///
/// @returns -1 if failure
///
int UInputAbsY(int fd, int y)
{
struct input_event event;
memset(&event, 0, sizeof(event));
event.type = EV_ABS;
event.code = ABS_Y;
event.value = y;
return write(fd, &event, sizeof(event));
}
///
/// Send relative x event
///
/// @param fd uinput file descriptor
/// @param x relative x coordinate
///
/// @returns -1 if failure
///
int UInputRelX(int fd, int x)
{
struct input_event event;
memset(&event, 0, sizeof(event));
event.type = EV_REL;
event.code = REL_X;
event.value = x;
return write(fd, &event, sizeof(event));
}
///
/// Send relative y event
///
/// @param fd uinput file descriptor
/// @param y relative y coordinate
///
/// @returns -1 if failure
///
int UInputRelY(int fd, int y)
{
struct input_event event;
memset(&event, 0, sizeof(event));
event.type = EV_REL;
event.code = REL_Y;
event.value = y;
return write(fd, &event, sizeof(event));
}
///
/// Send syn event
///
/// @param fd uinput file descriptor
///
/// @returns -1 if failure
///
int UInputSyn(int fd)
{
struct input_event event;
memset(&event, 0, sizeof(event));
//gettimeofday(&event.time, NULL);
event.type = EV_SYN;
event.code = SYN_REPORT;
// event.value = 0;
return write(fd, &event, sizeof(event));
}
///
/// Close UInput
///
/// @param fd uinput file descriptor
///
void CloseUInput(int fd)
{
if (ioctl(fd, UI_DEV_DESTROY) < 0) {
perror("ioctl(UI_DEV_DESTROY)");
}
}