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@aecsocket
aecsocket committed Jun 30, 2024
1 parent d4bc940 commit c7f7d3f
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2 changes: 1 addition & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -48,7 +48,7 @@ This tool must be run as `sudo`, since it needs to read raw mouse inputs from yo

This tool uses `evdev`'s grab functionality, which allows a process to temporarily lock a device's
inputs so that only that process can consume them, and other processes do not read the events.
**This may cause some issues!**
**This may cause some issues with other processes which also grab!**

### Packages

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87 changes: 62 additions & 25 deletions src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@ use evdev_rs::{
Device, DeviceWrapper, GrabMode, ReadFlag, UInputDevice, UninitDevice,
};

use log::info;
use log::{debug, info, warn};
use util::{emit, enable_abs, enable_key, sync, Abs};

/// Simulate a trackpad with your physical mouse
Expand All @@ -26,6 +26,15 @@ struct Args {
/// Source device file to read mouse inputs from (e.g. `/dev/input/event1`)
#[arg(short, long)]
source: PathBuf,
/// `uinput` key code which activates swiping mode
///
/// When this is pressed, the swiping mode is activated. When this is
/// released, the swiping mode is deactivated.
///
/// Use `wev` to test which button on your mouse you want to use for
/// activation. For the MX Master 3S, the value is `277`.
#[arg(short, long, default_value_t = 277)]
trigger_key: u32,
/// Number of fingers to simulate a swipe with
#[arg(short, long, default_value_t = 3)]
fingers: u8,
Expand All @@ -38,17 +47,29 @@ struct Args {
/// device.
#[arg(short, long, default_value_t = 12)]
resolution: u16,
/// Disables grabbing the mouse cursor in `evdev` when swiping
///
/// If grabbing is disabled, the mouse cursor will move with the virtual
/// trackpad when swiping, but may resolve issues with other processes
/// which also attempt to grab the mouse.
#[arg(long)]
no_grab: bool,
}

fn main() -> Result<()> {
init_logging();

let Args {
source,
trigger_key,
fingers,
resolution,
no_grab,
} = Args::parse();

let trigger_key =
evdev_rs::enums::int_to_ev_key(trigger_key).ok_or(anyhow!("invalid trigger key code"))?;

let (fingers, btn_tool): (i32, _) = match fingers {
2 => (2, BTN_TOOL_DOUBLETAP),
3 => (3, BTN_TOOL_TRIPLETAP),
Expand All @@ -64,13 +85,20 @@ fn main() -> Result<()> {
let mut source = open_device(source).with_context(|| "failed to open source device")?;
let sink =
create_virtual_trackpad(resolution).with_context(|| "failed to create virtual trackpad")?;
info!(
"Created virtual trackpad (devnode = {:?}, syspath = {:?})",
sink.devnode(),
sink.syspath()
);

simulate_trackpad(&mut source, &sink, Config { fingers, btn_tool })?;
info!("Created virtual trackpad");
info!(" devnode = {:?}", sink.devnode());
info!(" syspath = {:?}", sink.syspath());

simulate_trackpad(
&mut source,
&sink,
Config {
fingers,
trigger_key,
btn_tool,
grab: !no_grab,
},
)?;

Ok(())
}
Expand Down Expand Up @@ -172,7 +200,7 @@ fn create_virtual_trackpad(resolution: u16) -> Result<UInputDevice> {
# Properties:
# Property type 0 (INPUT_PROP_POINTER)
# Property type 2 (INPUT_PROP_BUTTONPAD)
*/
*/

let dev = UninitDevice::new().ok_or(anyhow!("failed to create virtual device"))?;
dev.set_name("fukomaster virtual trackpad");
Expand Down Expand Up @@ -223,7 +251,9 @@ fn create_virtual_trackpad(resolution: u16) -> Result<UInputDevice> {
#[derive(Debug, Clone, Copy)]
struct Config {
fingers: i32,
trigger_key: EV_KEY,
btn_tool: EV_KEY,
grab: bool,
}

fn simulate_trackpad(source: &mut Device, sink: &UInputDevice, config: Config) -> Result<()> {
Expand All @@ -232,7 +262,12 @@ fn simulate_trackpad(source: &mut Device, sink: &UInputDevice, config: Config) -
Swiping { x: i32, y: i32 },
}

let Config { fingers, btn_tool } = config;
let Config {
fingers,
trigger_key,
btn_tool,
grab,
} = config;
let mut state = State::Normal;

loop {
Expand All @@ -241,9 +276,7 @@ fn simulate_trackpad(source: &mut Device, sink: &UInputDevice, config: Config) -
.with_context(|| "failed to read next event from source device")?;

match (&mut state, input.event_code, input.value) {
// BTN_FORWARD on MX Master 3S
// TODO configurable
(State::Normal, EventCode::EV_KEY(EV_KEY::BTN_FORWARD), 1) => {
(State::Normal, EventCode::EV_KEY(key), 1) if key == trigger_key => {
// start swipe
/*
E: 0.000001 0003 0039 8661 # EV_ABS / ABS_MT_TRACKING_ID 8661
Expand All @@ -263,11 +296,14 @@ fn simulate_trackpad(source: &mut Device, sink: &UInputDevice, config: Config) -
E: 0.000001 0003 0001 0665 # EV_ABS / ABS_Y 665
E: 0.000001 0004 0005 0000 # EV_MSC / MSC_TIMESTAMP 0
E: 0.000001 0000 0000 0000 # ------------ SYN_REPORT (0) ---------- +0ms
*/
*/

source
.grab(GrabMode::Grab)
.with_context(|| "failed to grab source device")?;
if grab {
if source.grab(GrabMode::Grab).is_err() {
warn!("Failed to grab source device, will not start swiping for now");
continue;
}
}

for finger in 0..fingers {
emit(&sink, ABS_MT_SLOT, finger)?;
Expand All @@ -280,13 +316,12 @@ fn simulate_trackpad(source: &mut Device, sink: &UInputDevice, config: Config) -
emit(&sink, btn_tool, 1)?;
sync(&sink)?;

info!("Started swiping");
debug!("Started swiping");
state = State::Swiping { x: 0, y: 0 };
}
(State::Normal, _, _) => {}

// TODO configurable
(State::Swiping { .. }, EventCode::EV_KEY(EV_KEY::BTN_FORWARD), 0) => {
(State::Swiping { .. }, EventCode::EV_KEY(key), 0) if key == trigger_key => {
// stop swipe
/*
E: 2.992985 0000 0000 0000 # ------------ SYN_REPORT (0) ---------- +7ms
Expand All @@ -304,7 +339,7 @@ fn simulate_trackpad(source: &mut Device, sink: &UInputDevice, config: Config) -
E: 3.007174 0001 0145 0000 # EV_KEY / BTN_TOOL_FINGER 0
E: 3.007174 0004 0005 2948400 # EV_MSC / MSC_TIMESTAMP 2948400
E: 3.007174 0000 0000 0000 # ------------ SYN_REPORT (0) ---------- +7ms
*/
*/

for finger in 0..fingers {
emit(&sink, ABS_MT_SLOT, finger)?;
Expand All @@ -314,11 +349,13 @@ fn simulate_trackpad(source: &mut Device, sink: &UInputDevice, config: Config) -
emit(&sink, btn_tool, 0)?;
sync(&sink)?;

source
.grab(GrabMode::Ungrab)
.with_context(|| "failed to ungrab source device")?;
if grab {
if source.grab(GrabMode::Ungrab).is_err() {
warn!("Failed to ungrab source device, will stop swiping as a failsafe");
}
}

info!("Stopped swiping");
debug!("Stopped swiping");
state = State::Normal;
}
(State::Swiping { mut x, y }, EventCode::EV_REL(REL_X), dx) => {
Expand Down

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