7896b254c1
API documented in previous version of uhid(4) man page has been obsolete since May 2009 when old USB stack was replaced with USB2 implentation. Current API has the same set of ioctl calls but uses usb_gen_descriptor structure to pass data to/from kernel. MFC after: 1 week
176 lines
4.8 KiB
Groff
176 lines
4.8 KiB
Groff
.\" $NetBSD: uhid.4,v 1.13 2001/12/29 14:41:59 augustss Exp $
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.\"
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.\" Copyright (c) 1999, 2001 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Lennart Augustsson.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 1, 2018
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.Dt UHID 4
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.Os
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.Sh NAME
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.Nm uhid
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.Nd USB generic HID support
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following line in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device uhid"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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uhid_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for all HID (Human Interface Device) interfaces
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in USB devices that do not have a special driver.
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.Pp
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The device handles the following
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.Xr ioctl 2
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calls:
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.Bl -tag -width indent
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.It Dv USB_GET_REPORT_ID Pq Vt int
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Get the report identifier used by this HID report.
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.It Dv USB_GET_REPORT_DESC Pq Vt "struct usb_gen_descriptor"
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Get the HID report descriptor.
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Copies a maximum of
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.Va ugd_maxlen
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bytes of the report descriptor data into the memory
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specified by
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.Va ugd_data .
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Upon return
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.Va ugd_actlen
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is set to the number of bytes copied.
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Using
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this descriptor the exact layout and meaning of data to/from
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the device can be found.
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The report descriptor is delivered
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without any processing.
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.Bd -literal
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struct usb_gen_descriptor {
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void *ugd_data;
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uint16_t ugd_maxlen;
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uint16_t ugd_actlen;
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uint8_t ugd_report_type;
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...
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};
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.Ed
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.It Dv USB_SET_IMMED Pq Vt int
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Sets the device in a mode where each
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.Xr read 2
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will return the current value of the input report.
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Normally
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a
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.Xr read 2
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will only return the data that the device reports on its
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interrupt pipe.
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This call may fail if the device does not support
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this feature.
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.It Dv USB_GET_REPORT Pq Vt "struct usb_gen_descriptor"
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Get a report from the device without waiting for data on
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the interrupt pipe.
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Copies a maximum of
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.Va ugd_maxlen
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bytes of the report data into the memory specified by
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.Va ugd_data .
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Upon return
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.Va ugd_actlen
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is set to the number of bytes copied.
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The
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.Va ugd_report_type
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field indicates which report is requested.
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It should be
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.Dv UHID_INPUT_REPORT ,
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.Dv UHID_OUTPUT_REPORT ,
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or
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.Dv UHID_FEATURE_REPORT .
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This call may fail if the device does not support this feature.
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.It Dv USB_SET_REPORT Pq Vt "struct usb_gen_descriptor"
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Set a report in the device.
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The
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.Va ugd_report_type
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field indicates which report is to be set.
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It should be
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.Dv UHID_INPUT_REPORT ,
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.Dv UHID_OUTPUT_REPORT ,
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or
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.Dv UHID_FEATURE_REPORT .
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The value of the report is specified by the
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.Va ugd_data
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and the
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.Va ugd_maxlen
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fields.
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This call may fail if the device does not support this feature.
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.El
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.Pp
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Use
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.Xr read 2
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to get data from the device.
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Data should be read in chunks of the
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size prescribed by the report descriptor.
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.Pp
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Use
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.Xr write 2
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to send data to the device.
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Data should be written in chunks of the
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size prescribed by the report descriptor.
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.Sh SYSCTL VARIABLES
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The following variables are available as both
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.Xr sysctl 8
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variables and
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.Xr loader 8
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tunables:
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.Bl -tag -width indent
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.It Va hw.usb.uhid.debug
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Debug output level, where 0 is debugging disabled and larger values increase
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debug message verbosity.
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Default is 0.
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.Sh FILES
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.Bl -tag -width ".Pa /dev/uhid?"
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.It Pa /dev/uhid?
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.El
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.Sh SEE ALSO
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.Xr usbhidctl 1 ,
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.Xr usb 4
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.Sh HISTORY
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The
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.Nm
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driver
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appeared in
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.Nx 1.4 .
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This manual page was adopted from
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.Nx
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by
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.An Tom Rhodes Aq Mt trhodes@FreeBSD.org
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in April 2002.
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