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Go package for the Linux evdev interface

License: MIT License

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go-evdev's Introduction

Go support for the Linux evdev interface

This is a pure Go package for the Linux evdev interface, without cgo dependencies.

The Linux evdev interface is the userspace interface to interact with input devices such as keyboard, mice, joysticks, touchscreens, rotary encoders etc.

The implementation in this package has the following features:

Query device information such as the name, the physical location, the unique ID, the vendor/product/bus/version IDs
Query supported event types, codes and device properties
Query the current status of bit-field based input types (such as keyboard, switches etc) as well as information on absolute types (ABS_X, ...) including their min/max values and current state
Grab/Ungrab/Revoke support for exclusive claiming of devices
Auto-generated const definitions and maps for types and codes from the kernel include headers

Install

go get github.com/holoplot/go-evdev

And then use it in your source code.

import "github.com/holoplot/go-evdev"

Re-generating codes.go

To re-generate codes.go from the latest kernel headers, use the following command.

go run build/gen-codes/main.go

You can optionally validate generated string mappings with go run build/gen-codes-validate/main.go

Example

See the code in cmd/evtest for an example.

MIT License

See file LICENSE for details.

go-evdev's People

Contributors

Stargazers

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Forkers

nongfah joestr indeedhat andrerenaud fixje gethiox maitredede junknet

go-evdev's Issues

Why huge maps twice: KEYToString and KEYNames?

I noticed that that there are two huge maps, which are almost identical:


var KEYToString = map[EvCode]string{
	KEY_RESERVED:   "KEY_RESERVED",
	KEY_ESC:        "KEY_ESC",
	KEY_1:          "KEY_1",
	KEY_2:          "KEY_2",
	KEY_3:          "KEY_3",
...

And

var KEYNames = map[EvCode]string{
	KEY_RESERVED:   "KEY_RESERVED",
	KEY_ESC:        "KEY_ESC",
	KEY_1:          "KEY_1",
	KEY_2:          "KEY_2",
	KEY_3:          "KEY_3",
...

Is there a reason for this, or is this just a typo?

Leaking file descriptor in Open method

The Open() method does not close the device's file descriptor if ioctlEVIOCGVERSION(d.file.Fd()) returns an error. This results in resource leaks.

// Open creates a new InputDevice from the given path. Returns an error if
// the device node could not be opened or its properties failed to read.
func Open(path string) (*InputDevice, error) {
	d := &InputDevice{}

	var err error
	d.file, err = os.OpenFile(path, os.O_RDWR, 0)
	if err != nil {
		return nil, err
	}

	d.driverVersion, err = ioctlEVIOCGVERSION(d.file.Fd())
	if err != nil {
                // ERROR d.file not closed
		return nil, fmt.Errorf("cannot get driver version: %v", err)
	}

	return d, nil
}

Feature Request - Force Feedback support

Any chances of getting force feedback support added to this repo? Specifically upload effect which is EVIOCSFF (0x80).

I am attempting to add it myself, but I am unfamiliar with IOCTL, so it isn't going great. Getting a bad address error when attempting to make the call.

func ioctlEVIOCSFF(fd uintptr, effect Effect) error {
	code := ioctlMakeCode(ioctlDirWrite, 'E', 0x80, unsafe.Sizeof(effect))
	return doIoctl(fd, code, unsafe.Pointer(&effect))
}

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