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HID tools

Project description

hid-tools is a set of tools to interact with the kernel's HID subsystem.

It can be run directly from the git repository or installed via pip3 install hid-tools.


The hid-tools repository does not need to be installed, all tools and kernel tests can be run straight from the git repository, for example the following commands clone the repository and run the hid-recorder tool.

$ git clone
$ cd hid-tools
$ sudo ./hid-recorder

Where the tools need to be installed, it is recommended to use pip:

$ sudo pip3 install .

This installs all tools into the system-wide Python path. hid-tools needs root access to the /dev/hidraw nodes, an installation in the user-specific paths will not usually work without further commandline tweaking configuration. Removal of the tools works with pip as well:

$ pip3 uninstall hid-tools

Debugging tools for users


hid-recorder prints the HID Report Descriptor from a /dev/hidraw device node and any HID reports coming from that device. The output format can be used with hid-replay for debugging. When run without any arguments, the tool prints a list of available devices.

$ sudo hid-recorder


hid-replay takes the output from hid-recorder and replays it through a virtual HID device that looks exactly like the one recorded. hid-replay requires UHID support so make sure pyudev is installed.

$ sudo hid-replay recording-file.hid


hid-decode takes a HID Report Descriptor and prints a human-readable version of it. hid-decode takes binary report descriptors, strings of bytes, and other formats.

$ hid-decode /sys/class/input/event5/device/device/report_descriptor

kernel tests

The hid-tools repository contains a number of tests exercising the kernel HID subsystem. The tests are not part of the pip3 module and must be run from the git repository. The most convenient invocation of the tests is by simply calling pytest. The test suite requires UHID support so make sure pyudev is installed.

$ git clone
$ cd hid-tools

Note If your testing system is running X, please follow the steps below to let X drivers ignore uhid test devices. Otherwise, the X driver will recognize and handle the test devices, which would interfere with the kernel tests and the running session.

$ sudo cp tests/91-hid-tools-uhid-test.conf /etc/X11/xorg.conf.d/

Restart your X server End of Note

$ sudo pytest-3

See the pytest documentation for information on how to run a subset of tests.

hidtools python module

Technical limitations require that hid-tools ships with a Python module called hidtools. This module is not to be used by external applications.

The hidtools python module does not provide any API stability guarantee. It may change at any time


hid-tools is licensed under the GPLv2+.

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