Inject tablet/pen events into a dedicated uinput device

src/event_reader.rs

@@ -52,6 +52,7 @@ pub struct EventReader {
 impl EventReader {
     pub fn new(
         config: Vec<Config>,
+        virt_dev: Arc<Mutex<VirtualDevices>>,
         stream: Arc<Mutex<EventStream>>,
         modifiers: Arc<Mutex<Vec<Event>>>,
         modifier_was_activated: Arc<Mutex<bool>>,
@@ -72,7 +73,6 @@ impl EventReader {
                 .unwrap()
                 .clone(),
         ));
-        let virt_dev = Arc::new(Mutex::new(VirtualDevices::new()));
         let lstick_function = config
             .iter()
             .find(|&x| x.associations == Associations::default())
@@ -264,6 +264,11 @@ impl EventReader {
         ) = ((0, 0), (0, 0), (0, 0), (0, 0), 0);
         let switcher: Key = self.settings.layout_switcher;
         let mut stream = self.stream.lock().await;
+        let mut pen_events: Vec<InputEvent> = Vec::new();
+        let is_tablet: bool =
+            stream.device().properties().contains(evdev::PropType::POINTER)
+            && stream.device().supported_keys()
+            .unwrap_or(&evdev::AttributeSet::new()).contains(evdev::Key::BTN_TOOL_PEN);
         let mut max_abs_wheel = 0;
         if let Ok(abs_state) = stream.device().get_abs_state() {
             for state in abs_state {
@@ -277,9 +282,18 @@ impl EventReader {
                 event.event_type(),
                 RelativeAxisType(event.code()),
                 AbsoluteAxisType(event.code()),
+                is_tablet,
             ) {
-                (EventType::KEY, _, _) => match Key(event.code()) {
+                (EventType::KEY, _, _, _) => match Key(event.code()) {
                     Key::BTN_TL2 | Key::BTN_TR2 => {}
+                    Key::BTN_TOOL_PEN
+                    | Key::BTN_TOOL_RUBBER
+                    | Key::BTN_TOOL_BRUSH
+                    | Key::BTN_TOOL_PENCIL
+                    | Key::BTN_TOOL_AIRBRUSH
+                    | Key::BTN_TOOL_MOUSE
+                    | Key::BTN_TOOL_LENS
+                    if is_tablet => pen_events.push(event),
                     key if key == switcher && event.value() == 1 => {
                         self.change_active_layout().await
                     }
@@ -297,6 +311,7 @@ impl EventReader {
                     EventType::RELATIVE,
                     RelativeAxisType::REL_WHEEL | RelativeAxisType::REL_WHEEL_HI_RES,
                     _,
+                    _,
                 ) => match event.value() {
                     -1 => {
                         self.convert_event(event, Event::Axis(Axis::SCROLL_WHEEL_DOWN), 1, true)
@@ -308,7 +323,35 @@ impl EventReader {
                     }
                     _ => {}
                 },
-                (_, _, AbsoluteAxisType::ABS_HAT0X) => {
+                (EventType::ABSOLUTE, _, AbsoluteAxisType::ABS_WHEEL, _) => {
+                    let value = event.value();
+                    if value != 0 && abs_wheel_position != 0 {
+                        let gap = value - abs_wheel_position;
+                        if gap < -max_abs_wheel / 2 {
+                            self.convert_event(event, Event::Axis(Axis::ABS_WHEEL_CW), 1, true)
+                                .await;
+                        } else if gap > max_abs_wheel / 2 {
+                            self.convert_event(event, Event::Axis(Axis::ABS_WHEEL_CCW), 1, true)
+                                .await;
+                        } else if value > abs_wheel_position {
+                            self.convert_event(event, Event::Axis(Axis::ABS_WHEEL_CW), 1, true)
+                                .await;
+                        } else if value < abs_wheel_position {
+                            self.convert_event(event, Event::Axis(Axis::ABS_WHEEL_CCW), 1, true)
+                                .await;
+                        }
+                    }
+                    abs_wheel_position = value;
+                }
+                (EventType::ABSOLUTE, _, AbsoluteAxisType::ABS_MISC, false) => {
+                    if event.value() == 0 {
+                        abs_wheel_position = 0
+                    }
+                }
+                (EventType::ABSOLUTE, _, _, true) => {
+                    pen_events.push(event)
+                }
+                (_, _, AbsoluteAxisType::ABS_HAT0X, _) => {
                     match event.value() {
                         -1 => {
                             self.convert_event(event, Event::Axis(Axis::BTN_DPAD_LEFT), 1, false)
@@ -347,7 +390,7 @@ impl EventReader {
                         _ => {}
                     };
                 }
-                (_, _, AbsoluteAxisType::ABS_HAT0Y) => {
+                (_, _, AbsoluteAxisType::ABS_HAT0Y, _) => {
                     match event.value() {
                         -1 => {
                             self.convert_event(event, Event::Axis(Axis::BTN_DPAD_UP), 1, false)
@@ -386,7 +429,12 @@ impl EventReader {
                         _ => {}
                     };
                 }
-                (EventType::ABSOLUTE, _, AbsoluteAxisType::ABS_X | AbsoluteAxisType::ABS_Y) => {
+                (
+                    EventType::ABSOLUTE,
+                    _,
+                    AbsoluteAxisType::ABS_X | AbsoluteAxisType::ABS_Y,
+                    false
+                ) => {
                     match self.settings.lstick.function.as_str() {
                         "cursor" | "scroll" => {
                             let axis_value = self
@@ -513,7 +561,12 @@ impl EventReader {
                         _ => {}
                     }
                 }
-                (EventType::ABSOLUTE, _, AbsoluteAxisType::ABS_RX | AbsoluteAxisType::ABS_RY) => {
+                (
+                    EventType::ABSOLUTE,
+                    _,
+                    AbsoluteAxisType::ABS_RX | AbsoluteAxisType::ABS_RY,
+                    false
+                ) => {
                     match self.settings.rstick.function.as_str() {
                         "cursor" | "scroll" => {
                             let axis_value = self
@@ -644,7 +697,7 @@ impl EventReader {
                         _ => {}
                     }
                 }
-                (EventType::ABSOLUTE, _, AbsoluteAxisType::ABS_Z) => {
+                (EventType::ABSOLUTE, _, AbsoluteAxisType::ABS_Z, false) => {
                     match (event.value(), triggers_values.0) {
                         (0, 1) => {
                             self.convert_event(event, Event::Axis(Axis::BTN_TL2), 0, false)
@@ -659,7 +712,7 @@ impl EventReader {
                         _ => {}
                     }
                 }
-                (EventType::ABSOLUTE, _, AbsoluteAxisType::ABS_RZ) => {
+                (EventType::ABSOLUTE, _, AbsoluteAxisType::ABS_RZ, false) => {
                     match (event.value(), triggers_values.1) {
                         (0, 1) => {
                             self.convert_event(event, Event::Axis(Axis::BTN_TR2), 0, false)
@@ -674,31 +727,16 @@ impl EventReader {
                         _ => {}
                     }
                 }
-                (EventType::ABSOLUTE, _, AbsoluteAxisType::ABS_WHEEL) => {
+                (EventType::MISC, _, _, true) => {
-                    let value = event.value();
+                    if !stream.device().properties().contains(evdev::PropType::POINTER) {
-                    if value != 0 && abs_wheel_position != 0 {
+                        self.emit_default_event(event).await;
-                        let gap = value - abs_wheel_position;
+                    } else if evdev::MiscType(event.code()) == evdev::MiscType::MSC_SERIAL {
-                        if gap < -max_abs_wheel / 2 {
+                        pen_events.push(event);
-                            self.convert_event(event, Event::Axis(Axis::ABS_WHEEL_CW), 1, true)
+                        let mut virt_dev = self.virt_dev.lock().await;
-                                .await;
+                        virt_dev.abs.emit(&pen_events).unwrap();
-                        } else if gap > max_abs_wheel / 2 {
+                        pen_events.clear()
-                            self.convert_event(event, Event::Axis(Axis::ABS_WHEEL_CCW), 1, true)
-                                .await;
-                        } else if value > abs_wheel_position {
-                            self.convert_event(event, Event::Axis(Axis::ABS_WHEEL_CW), 1, true)
-                                .await;
-                        } else if value < abs_wheel_position {
-                            self.convert_event(event, Event::Axis(Axis::ABS_WHEEL_CCW), 1, true)
-                                .await;
                     }
                 }
-                    abs_wheel_position = value;
-                }
-                (EventType::ABSOLUTE, _, AbsoluteAxisType::ABS_MISC) => {
-                    if event.value() == 0 {
-                        abs_wheel_position = 0
-                    };
-                }
                 _ => self.emit_default_event(event).await,
             }
         }
@@ -877,6 +915,13 @@ impl EventReader {
                 EventType::RELATIVE => {
                     virt_dev.axis.emit(&[default_event]).unwrap();
                 }
+                EventType::ABSOLUTE => {
+                    virt_dev.abs.emit(&[default_event]).unwrap();
+                }
+                EventType::MISC => {
+                    let mut virt_dev = self.virt_dev.lock().await;
+                    virt_dev.abs.emit(&[default_event]).unwrap();
+                }
                 _ => {}
             }
         }
@@ -892,6 +937,14 @@ impl EventReader {
                 let mut virt_dev = self.virt_dev.lock().await;
                 virt_dev.axis.emit(&[event]).unwrap();
             }
+            EventType::ABSOLUTE => {
+                let mut virt_dev = self.virt_dev.lock().await;
+                virt_dev.abs.emit(&[event]).unwrap();
+            }
+            EventType::MISC => {
+                let mut virt_dev = self.virt_dev.lock().await;
+                virt_dev.abs.emit(&[event]).unwrap();
+            }
             _ => {}
         }
     }

src/udev_monitor.rs

@@ -1,6 +1,7 @@
 use crate::config::{Associations, Event};
 use crate::event_reader::EventReader;
 use crate::Config;
+use crate::virtual_devices::VirtualDevices;
 use evdev::{Device, EventStream};
 use std::{env, path::Path, process::Command, sync::Arc};
 use tokio::sync::Mutex;
@@ -138,8 +139,10 @@ pub fn launch_tasks(
                 Path::new(&event_device),
                 config_list.clone(),
             )));
+            let virt_dev = Arc::new(Mutex::new(VirtualDevices::new(device.1)));
             let reader = EventReader::new(
                 config_list.clone(),
+                virt_dev,
                 stream,
                 modifiers.clone(),
                 modifier_was_activated.clone(),
@@ -213,7 +216,7 @@ fn set_environment() -> Environment {
         }
         (Ok(session), Ok(desktop)) if session == wayland => {
             println!("Warning: unsupported compositor: {}, won't be able to change bindings according to the active window.\n\
-                    Currently supported desktops: Hyprland, Sway, Plasma/KWin, X11.\n", desktop);
+                    Currently supported desktops: Hyprland, Sway, Niri, Plasma/KWin, X11.\n", desktop);
             Server::Unsupported
         }
         (Ok(session), _) if session == x11 => {

src/virtual_devices.rs

@@ -6,10 +6,11 @@ use evdev::{
 pub struct VirtualDevices {
     pub keys: VirtualDevice,
     pub axis: VirtualDevice,
+    pub abs: VirtualDevice,
 }
 
 impl VirtualDevices {
-    pub fn new() -> Self {
+    pub fn new(device: evdev::Device) -> Self {
         let mut key_capabilities = evdev::AttributeSet::new();
         for i in 1..334 {
             key_capabilities.insert(Key(i));
@@ -18,6 +19,46 @@ impl VirtualDevices {
         for i in 0..13 {
             axis_capabilities.insert(evdev::RelativeAxisType(i));
         }
+        let mut tablet_abs_capabilities: Vec<evdev::UinputAbsSetup> = Vec::new();
+        if let Ok(absinfo) = device.get_abs_state() {
+            for (axis_type, info) in absinfo.iter().enumerate() {
+                if [0, 1, 2, 5, 6, 8, 24, 25, 26, 27].contains(&axis_type) {
+                    let new_absinfo = evdev::AbsInfo::new(
+                            info.value,
+                            info.minimum,
+                            info.maximum,
+                            info.fuzz,
+                            info.flat,
+                            info.resolution
+                    );
+                    tablet_abs_capabilities.push(
+                        evdev::UinputAbsSetup::new(
+                            evdev::AbsoluteAxisType(axis_type.try_into().unwrap()),
+                            new_absinfo
+                        )
+                    )
+                }
+            }
+        }
+        let mut tablet_capabilities = evdev::AttributeSet::new();
+        for i in 272..277 {
+            tablet_capabilities.insert(evdev::Key(i));
+        }
+        for i in 320..325 {
+            tablet_capabilities.insert(evdev::Key(i));
+        }
+        for i in 326..328 {
+            tablet_capabilities.insert(evdev::Key(i));
+        }
+        for i in 330..333 {
+            tablet_capabilities.insert(evdev::Key(i));
+        }
+        let mut tab_rel = evdev::AttributeSet::new();
+        tab_rel.insert(evdev::RelativeAxisType(8));
+        let mut tab_msc = evdev::AttributeSet::new();
+        tab_msc.insert(evdev::MiscType(0));
+        let mut pointer_prop = evdev::AttributeSet::new();
+        pointer_prop.insert(evdev::PropType::POINTER);
         let keys_builder = VirtualDeviceBuilder::new()
             .expect("Unable to create virtual device through uinput. Take a look at the Troubleshooting section for more info.")
             .name("Makima Virtual Keyboard/Mouse")
@@ -26,11 +67,24 @@ impl VirtualDevices {
             .expect("Unable to create virtual device through uinput. Take a look at the Troubleshooting section for more info.")
             .name("Makima Virtual Pointer")
             .with_relative_axes(&axis_capabilities).unwrap();
+        let mut abs_builder = VirtualDeviceBuilder::new()
+            .expect("Unable to create virtual device through uinput. Take a look at the Troubleshooting section for more info.")
+            .name("Makima Virtual Pen/Tablet")
+            .with_properties(&pointer_prop).unwrap()
+            .with_msc(&tab_msc).unwrap()
+            .with_relative_axes(&tab_rel).unwrap()
+            .with_keys(&tablet_capabilities).unwrap()
+            .input_id(device.input_id());
+        for abs_setup in tablet_abs_capabilities {
+            abs_builder = abs_builder.with_absolute_axis(&abs_setup).unwrap();
+        };
         let virtual_device_keys = keys_builder.build().unwrap();
         let virtual_device_axis = axis_builder.build().unwrap();
+        let virtual_device_abs = abs_builder.build().unwrap();
         Self {
             keys: virtual_device_keys,
             axis: virtual_device_axis,
+            abs: virtual_device_abs,
         }
     }
 }