path: root/usr.bin/usbhidctl/usbhidctl.1

.\" $OpenBSD: usbhidctl.1,v 1.16 2022/03/31 17:27:28 naddy Exp $
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by David Sainty <David.Sainty@dtsp.co.nz>
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.Dd $Mdocdate: March 31 2022 $
.Dt USBHIDCTL 1
.Os
.Sh NAME
.Nm usbhidctl
.Nd manipulate USB HID devices
.Sh SYNOPSIS
.Nm
.Fl f Ar device
.Op Fl t Ar table
.Op Fl alv
.Nm
.Fl f Ar device
.Op Fl t Ar table
.Op Fl v
.Fl r
.Nm
.Fl f Ar device
.Op Fl t Ar table
.Op Fl lnv
.Ar name ...
.Nm
.Fl f Ar device
.Op Fl t Ar table
.Fl w Ar name Ns = Ns Ar value ...
.Nm
.Fl f Ar device
.Fl R
.Sh DESCRIPTION
.Nm
can be used to output or modify the state of a USB HID (Human Interface Device).
If a list of items is present on the command line, then
.Nm
prints the current value of those items for the specified device.
If the
.Fl w
flag is specified,
.Nm
attempts to set the specified items to the given values.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl a
Show all items and their current values.
This option fails if the device does not support the GET_REPORT command.
This is the default, if no parameters other than
.Fl f
are given to
.Nm .
.It Fl f Ar device
Specify a path name for the device to operate on.
If
.Ar device
is numeric, it is taken to be the USB HID device number.
If it is a relative path, it is taken to be the name of the device under
.Pa /dev .
An absolute path is taken to be the literal device pathname.
.It Fl l
Loop and dump the device data every time it changes.
Only 'input' items are displayed in this mode.
.It Fl n
Suppress printing of the item name when querying specific items.
Only output the current value.
.It Fl R
Dump the raw USB HID report descriptor data as hexadecimal bytes.
.It Fl r
Dump the USB HID report descriptor.
.It Fl t Ar table
Specify a path name for the HID usage table file.
.It Fl v
Be verbose.
Repeating this option increases verbosity.
.It Fl w
Change item values.
Only 'output' and 'feature' kinds can be set with this option.
.El
.Sh SYNTAX
.Nm
parses the names of items specified on the command line against the human
interface items reported by the USB device.
Each human interface item is mapped from its native form to a human readable
name, using the HID usage table file.
Command line items are compared with the generated item names,
and the USB HID device is operated on when a match is found.
.Pp
Each human interface item is named by the
.Qq page
it appears in, the
.Qq usage
within that page, and the list of
.Qq collections
containing the item.
Each collection in turn is also identified by page, and
the usage within that page.
.Pp
On the
.Nm
command line the page name is separated from the usage name with the character
.Sq Cm \&: .
The collections are separated by the character
.Sq Cm \&. .
.Pp
As an alternative notation in items on the command line, the native numeric
value for the page name or usage can be used instead of the full human
readable page name or usage name.
Numeric values can be specified in decimal, octal or hexadecimal.
.Sh FILES
.Bl -tag -width "/usr/share/misc/usb_hid_usages"
.It Pa /usr/share/misc/usb_hid_usages
The default HID usage table.
.El
.Sh EXAMPLES
On a standard USB mouse the item
.Pp
.Dl Generic_Desktop:Mouse.Generic_Desktop:Pointer.Button:Button_2
.Pp
reflects the current status of button 2.
The
.Qq button 2
item is encapsulated within two collections, the
.Qq Mouse
collection in the
.Qq Generic Desktop
page, and the
.Qq Pointer
collection in the
.Qq Generic Desktop
page.
The item itself is the usage
.Qq Button_2
in the
.Qq Button
page.
.Pp
An item can generally be named by omitting one or more of the page names.
For example the
.Qq button 2
item would usually just be referred to on the command line as:
.Pp
.Dl $ usbhidctl -f /dev/wsmouse0 Mouse.Pointer.Button_2
.Pp
Items can also be named by referring to parts of the item name with the
numeric representation of the native HID usage identifiers.
This is most useful when items are missing from the HID usage table.
The page identifier for the
.Qq Generic Desktop
page is 1, and the usage identifier for the usage
.Qq Button_2
is 2, so the following can be used to refer to the
.Qq button 2
item:
.Pp
.Dl $ usbhidctl -f /dev/wsmouse0 1:Mouse.1:Pointer.Button:2
.Pp
Devices with human interface outputs can be manipulated with the
.Fl w
option.
For example, some USB mice have a Light Emitting Diode under software
control as usage 2 under page 0xffff, in the
.Qq Mouse
collection.
The following can be used to switch this LED off:
.Pp
.Dl $ usbhidctl -f /dev/wsmouse0 -w Mouse.0xffff:2=0
.Sh SEE ALSO
.Xr usbhidaction 1 ,
.Xr usbhid 3 ,
.Xr uhid 4 ,
.Xr usb 4
.Sh HISTORY
The
.Nm
command first appeared in
.Ox 3.0 .
.Sh AUTHORS
.An David Sainty Aq Mt David.Sainty@dtsp.co.nz
.Sh BUGS
Some USB HID devices report multiple items with exactly the same usage
identifiers.
The current naming scheme does not provide the means to specify
which of a set of identically named items you are referring to.