udev-hid-bpf - Man Page

udev-hid-bpf [--help|--version] <command> [args]

udev-hid-bpf is a loader and general utility tool for HID eBPF programs. Typically it is invoked by udev to load and unload HID eBPF programs that match a given device but it provides commands to ease development of new eBPF programs and install specific eBPF programs that are not installed by default.

--help

Print help and exit

--verbose

Enable verbose output for the given command

--version

Print version and exit

add [--bpfdir /path/to/directory] device [/path/to/program.bpf.o]

Invoked by udev when a device is added. This command loads all matching HID eBPF programs for this device or if a program is given just that one program.  The list of matching eBPF programs is stored in the udev hwdb.

The set of directories to search for eBPF programs is built-in but can be adjusted with the --bpfdir option.

The device must be specified as a syspath.

remove device

Invoked by udev when a device is remove. This command removes all HID eBPF programs for this device.

The device must be specified as a syspath.

list-bpf-programs [--bpfdir /path/to/directory]

List available HID eBPF programs in the (built-in) default lookup directories or the given directory.

list-devices

List available HID devices.

inspect path/to/program.bpf.o

Inspect the given eBPF program.

install [options] path/to/program.bpf.o

Install the given eBPF program into /etc/udev-hid-bpf with a corresponding udev rule in /etc/udev/rules.d. This command should be used for testing a single eBPF program or where a full install of udev-hid-bpf is not suitable.

The following options are available for the --install command:

--dry-run

Do everything except actually creating directories and installing target files

--install-exe

Also install the udev-hid-bpf executable in $prefix/bin. If the executable already exists at that path this option does nothing.

--force

Overwrite existing files with the same name

--prefix /usr/local

Install into the given prefix. Defaults to the built-in prefix.

udev-hid-bpf's online documentation https://libevdev.pages.freedesktop.org/udev-hid-bpf/

huion-switcher(1).