54 lines
3.2 KiB
Markdown
54 lines
3.2 KiB
Markdown
[![Travis][travisimg]][travisurl]
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[![AppVeyor][appveyorimg]][appveyorurl]
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[![GoDoc][docimg]][docurl]
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[travisimg]: https://travis-ci.org/karalabe/hid.svg?branch=master
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[travisurl]: https://travis-ci.org/karalabe/hid
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[appveyorimg]: https://ci.appveyor.com/api/projects/status/plroy54odykb0ch3/branch/master?svg=true
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[appveyorurl]: https://ci.appveyor.com/project/karalabe/hid
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[docimg]: https://godoc.org/github.com/karalabe/hid?status.svg
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[docurl]: https://godoc.org/github.com/karalabe/hid
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# Gopher Interface Devices (USB HID)
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The `hid` package is a cross platform library for accessing and communicating with USB Human Interface
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Devices (HID). It is an alternative package to [`gousb`](https://github.com/karalabe/gousb) for use
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cases where devices support this ligher mode of operation (e.g. input devices, hardware crypto wallets).
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The package wraps [`hidapi`](https://github.com/signal11/hidapi) for accessing OS specific USB HID APIs
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directly instead of using low level USB constructs, which might have permission issues on some platforms.
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On Linux the package also wraps [`libusb`](https://github.com/libusb/libusb). Both of these dependencies
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are vendored directly into the repository and wrapped using CGO, making the `hid` package self-contained
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and go-gettable.
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Supported platforms at the moment are Linux, macOS and Windows (exclude constraints are also specified
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for Android and iOS to allow smoother vendoring into cross platform projects).
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## Cross-compiling
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Using `go get` the embedded C library is compiled into the binary format of your host OS. Cross compiling to a different platform or architecture entails disabling CGO by default in Go, causing device enumeration `hid.Enumerate()` to yield no results.
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To cross compile a functional version of this library, you'll need to enable CGO during cross compilation via `CGO_ENABLED=1` and you'll need to install and set a cross compilation enabled C toolkit via `CC=your-cross-gcc`.
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## Acknowledgements
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Although the `hid` package is an implementation from scratch, it was heavily inspired by the existing
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[`go.hid`](https://github.com/GeertJohan/go.hid) library, which seems abandoned since 2015; is incompatible
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with Go 1.6+; and has various external dependencies. Given its inspirational roots, I thought it important
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to give credit to the author of said package too.
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Wide character support in the `hid` package is done via the [`gowchar`](https://github.com/orofarne/gowchar)
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library, unmaintained since 2013; non buildable with a modern Go release and failing `go vet` checks. As
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such, `gowchar` was also vendored in inline (copyright headers and origins preserved).
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## License
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The components of `hid` are licensed as such:
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* `hidapi` is released under the [3-clause BSD](https://github.com/signal11/hidapi/blob/master/LICENSE-bsd.txt) license.
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* `libusb` is released under the [GNU LGPL 2.1](https://github.com/libusb/libusb/blob/master/COPYING)license.
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* `go.hid` is released under the [2-clause BSD](https://github.com/GeertJohan/go.hid/blob/master/LICENSE) license.
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* `gowchar` is released under the [3-clause BSD](https://github.com/orofarne/gowchar/blob/master/LICENSE) license.
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Given the above, `hid` is licensed under GNU LGPL 2.1 or later on Linux and 3-clause BSD on other platforms.
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