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@CyberShadow

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Last active December 21, 2018 01:01
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uinput-filter-mouse - program to filter and rewrite uinput events
Raw
.gitignore
/uinput-filter-mouse
/config.h
Raw
config.h.sample
#define UPSTREAM_UINPUT_DEVICE "/dev/input/by-id/usb-Logitech_G700_Laser_Mouse_37ADAF750037-event-mouse"
Raw
Makefile
uinput-filter-mouse: Makefile uinput-filter-mouse.c config.h
gcc -o $@ [email protected]
config.h:
@echo "Copy and edit \`config.h.sample' to \`config.h' first."
@exit 1
install:
install uinput-filter-mouse /usr/local/bin/
install -m 644 uinput-filter-mouse.service /etc/systemd/system
Raw
uinput-filter-mouse.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <linux/input.h>
#include <linux/uinput.h>
#include "config.h"
#define die(str, args...) do { \
perror(str); \
exit(EXIT_FAILURE); \
} while(0)
int
main(int argc, char* argv[])
{
int fdo, fdi;
struct uinput_user_dev uidev;
struct input_event ev;
int i;
//if(argc != 2) die("error: specify input device");
fdo = open("/dev/uinput", O_WRONLY | O_NONBLOCK);
if(fdo < 0) die("error: open");
//fdi = open(argv[1], O_RDONLY);
fdi = open(UPSTREAM_UINPUT_DEVICE, O_RDONLY);
if(fdi < 0) die("error: open");
if(ioctl(fdi, EVIOCGRAB, 1) < 0) die("error: ioctl");
if(ioctl(fdo, UI_SET_EVBIT, EV_SYN) < 0) die("error: ioctl");
if(ioctl(fdo, UI_SET_EVBIT, EV_KEY) < 0) die("error: ioctl");
if(ioctl(fdo, UI_SET_EVBIT, EV_REL) < 0) die("error: ioctl");
if(ioctl(fdo, UI_SET_EVBIT, EV_MSC) < 0) die("error: ioctl");
for(i = 0; i < KEY_MAX; ++i)
if(ioctl(fdo, UI_SET_KEYBIT, i) < 0) die("error: ioctl");
for(i = 0; i < REL_MAX; ++i)
if(ioctl(fdo, UI_SET_RELBIT, i) < 0) die("error: ioctl");
memset(&uidev, 0, sizeof(uidev));
snprintf(uidev.name, UINPUT_MAX_NAME_SIZE, "my-uinput-filter");
uidev.id.bustype = BUS_USB;
uidev.id.vendor = 0x1;
uidev.id.product = 0x1;
uidev.id.version = 1;
if(write(fdo, &uidev, sizeof(uidev)) < 0) die("error: write");
if(ioctl(fdo, UI_DEV_CREATE) < 0) die("error: ioctl");
while(1)
{
if(read(fdi, &ev, sizeof(struct input_event)) < 0)
die("error: read");
//printf("Got event! type=%d code=%d value=%d\n", ev.type, ev.code, ev.value);
//ev.time.tv_sec = 0;
//ev.time.tv_usec = 0;
if (ev.type == EV_KEY)
{
int key = ev.code;
if (key == BTN_EXTRA || key == BTN_SIDE)
{
ev.code = KEY_LEFTMETA;
if(write(fdo, &ev, sizeof(struct input_event)) < 0)
die("error: write");
if (key == BTN_EXTRA)
ev.code = BTN_LEFT;
if (key == BTN_SIDE)
ev.code = BTN_RIGHT;
if(write(fdo, &ev, sizeof(struct input_event)) < 0)
die("error: write");
}
}
if(write(fdo, &ev, sizeof(struct input_event)) < 0)
die("error: write");
}
if(ioctl(fdo, UI_DEV_DESTROY) < 0) die("error: ioctl");
close(fdi);
close(fdo);
return 0;
}
Raw
uinput-filter-mouse.service
[Unit]
Description=uinput mouse filter
[Service]
ExecStart=/usr/local/bin/uinput-filter-mouse
Restart=always
[Install]
WantedBy=default.target
@aksel
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aksel commented Sep 15, 2017 •
edited by CyberShadow
Loading

I'm don't have a lot of experience in C, so I was wondering, can you help me out a little bit?

The button code I'm trying to map is 0x118. I have gotten it to work with binding it to KEY_LEFTMETA + BTN_LEFT.

I would also like to bind it to BTN_RIGHT when leftmeta is already pressed. However, it doesn't seem to work. Any pointers what I'm doing wrong?

Here's the modified code.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <linux/input.h>
#include <linux/uinput.h>

#include "config.h"

#define die(str, args...) do { \
        perror(str); \
        exit(EXIT_FAILURE); \
    } while(0)

int
main(int argc, char* argv[])
{
    int                    fdo, fdi;
    struct uinput_user_dev uidev;
    struct input_event     ev;
    int                    i;
    int                    mod_pressed;

    //if(argc != 2) die("error: specify input device");

    fdo = open("/dev/uinput", O_WRONLY | O_NONBLOCK);
    if(fdo < 0) die("error: open");

    //fdi = open(argv[1], O_RDONLY);
    fdi = open(UPSTREAM_UINPUT_DEVICE, O_RDONLY);
    if(fdi < 0) die("error: open");

    if(ioctl(fdi, EVIOCGRAB, 1) < 0) die("error: ioctl");

    if(ioctl(fdo, UI_SET_EVBIT, EV_SYN) < 0) die("error: ioctl");
    if(ioctl(fdo, UI_SET_EVBIT, EV_KEY) < 0) die("error: ioctl");
    if(ioctl(fdo, UI_SET_EVBIT, EV_REL) < 0) die("error: ioctl");
    if(ioctl(fdo, UI_SET_EVBIT, EV_MSC) < 0) die("error: ioctl");

    for(i = 0; i < KEY_MAX; ++i)
        if(ioctl(fdo, UI_SET_KEYBIT, i) < 0) die("error: ioctl");
    for(i = 0; i < REL_MAX; ++i)
        if(ioctl(fdo, UI_SET_RELBIT, i) < 0) die("error: ioctl");

    memset(&uidev, 0, sizeof(uidev));
    snprintf(uidev.name, UINPUT_MAX_NAME_SIZE, "my-uinput-filter");
    uidev.id.bustype = BUS_USB;
    uidev.id.vendor  = 0x1;
    uidev.id.product = 0x1;
    uidev.id.version = 1;

    if(write(fdo, &uidev, sizeof(uidev)) < 0) die("error: write");
    if(ioctl(fdo, UI_DEV_CREATE) < 0) die("error: ioctl");

    mod_pressed = 0;
    while(1)
    {
        if(read(fdi, &ev, sizeof(struct input_event)) < 0)
            die("error: read");

        //printf("Got event! type=%d code=%d value=%d\n", ev.type, ev.code, ev.value);
        //ev.time.tv_sec = 0;
        //ev.time.tv_usec = 0;

        if (ev.type == EV_KEY)
        {
            if (ev.code == KEY_LEFTMETA)
            {
                mod_pressed = ev.value; // 0 if released, 1 if pressed.
            }
            
            else if (ev.code == 0x118)
            {
                if (mod_pressed)
                {
                    ev.code = BTN_RIGHT;
                }
                
                else
                {
                    ev.code = KEY_LEFTMETA;
                    if(write(fdo, &ev, sizeof(struct input_event)) < 0)
                        die("error: write");
        
                    ev.code = BTN_LEFT;
                }
            }
        }

        if(write(fdo, &ev, sizeof(struct input_event)) < 0)
            die("error: write");
    }

    if(ioctl(fdo, UI_DEV_DESTROY) < 0) die("error: ioctl");

    close(fdi);
    close(fdo);

    return 0;
}

@CyberShadow
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Author

@aksel Sorry for the late reply, I don't think I saw your message until now. I'm not quite clear on what you're trying to achieve - you want to translate key 0x118 to KEY_LEFTMETA + BTN_LEFT, but also translate KEY_LEFTMETA + 0x118 to BTN_RIGHT?

@aksel
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aksel commented Jul 16, 2018

I haven't seen your reply until now

Gist stuff doesn't trigger a notification, apparently

But yeah, that was what I wanted to do.

0x118 -> KEY_LEFTMETA + BTN_LEFT (for moving floating)
KEY_LEFTMETA + 0x118 -> KEY_LEFTMETA + BTN_RIGHT (for resizing)

I have since gotten a new mouse, that has an extra button that I have bound to resizing. But for future reference, how
would I have achieved the other thing?

@aksel
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aksel commented Jul 17, 2018

Hahaha, how to contact you... Maybe a ping @CyberShadow will work?

@CyberShadow
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Gist stuff doesn't trigger a notification, apparently

It seems to be a long-standing omission: isaacs/github#21

These's apparently a third-party service: https://giscus.co/

But for future reference, how
would I have achieved the other thing?

Your code looks correct... I don't know why it wouldn't work.

I would try debugging it with more logging in the program, and looking at what ends up in xev.

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