# HID Gadget Emulation in Rust

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Rust crate for interfacing with Linux HID Gadget devices (/dev/hidgX).

Since all functionality is dependent on Linux function calls, this crate only compiles for Linux systems.

## Crates

- [hidg-core](https://crates.io/crates/hidg-core) - core abstractions and low level interface (not for end users)
- **[hidg](https://crates.io/crates/hidg)** - std interface which supports synchronous operation only
- [tokio-hidg](https://crates.io/crates/tokio-hidg) - async interface for [tokio](https://tokio.rs/) runtime
- [async-hidg](https://crates.io/crates/async-hidg) - async interface for other runtimes

## Features

- *fromstr* - implements [core::str::FromStr] implementation for some types
- *display* - implements [std::fmt::Display] implementation for some types
- *phf* - use [phf](https://crates.io/crates/phf) in [core::str::FromStr] trait implementations
- *serde* - enables [serde](https://crates.io/crates/serde) support for some types
- *keyboard* - enables keyboard class support
- *mouse* - enables mouse class support

## Usage examples

Keyboard input simulation:

```rust,no_run
use hidg::{Class, Device, Keyboard, Key, Led, StateChange};

fn main() -> std::io::Result<()> {
    let mut device = Device::<Keyboard>::open(0)?; // open device

    // Create input report
    let mut input = Keyboard.input();

    // Press left ctrl modifier
    input.press_key(Key::LeftCtrl);

    // Press key 'A'
    input.press_key(Key::A);

    // Send input report
    device.input(&input)?;

    // Get pressed keys
    println!("Keys: {:?}", input.pressed().collect::<Vec<Key>>());

    // Release left ctrl modifier
    input.release_key(Key::LeftCtrl);

    // Release key 'A'
    input.release_key(Key::A);

    // Send input report
    device.input(&input)?;

    // Create output report
    let mut output = Keyboard.output();

    // Receive output report
    device.output(&mut output)?;

    // Print lit LEDs
    println!("LEDs: {:?}", output.lit().collect::<Vec<Led>>());

    Ok(())
}
```

Mouse input simulation:

```rust,no_run
use hidg::{Button, Class, Device, Mouse, StateChange, ValueChange};

fn main() -> std::io::Result<()> {
    let mut device = Device::<Mouse>::open("hidg0")?; // open device

    // Create input report
    let mut input = Mouse.input();

    // Press primary button
    input.press_button(Button::Primary);

    // Update pointer coordinates
    input.change_pointer((150, 50), false);

    // Send input report
    device.input(&input)?;

    // Move pointer relatively
    input.change_pointer((70, -30), true);

    // Get pressed buttons
    println!("Buttons: {:?}", input.pressed().collect::<Vec<Button>>());

    // Release primary button
    input.release_button(Button::Primary);

    // Send input report
    device.input(&input)?;

    Ok(())
}
```