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.\" $OpenBSD: uhid.4,v 1.2 1999/08/13 14:47:50 aaron Exp $
.\" $NetBSD: uhid.4,v 1.6 1999/05/11 21:05:09 augustss Exp $
.\"
.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Lennart Augustsson.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the NetBSD
.\" Foundation, Inc. and its contributors.
.\" 4. Neither the name of The NetBSD Foundation nor the names of its
.\" contributors may be used to endorse or promote products derived
.\" from this software without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd July 12, 1998
.Dt UHID 4
.Os
.Sh NAME
.Nm uhid
.Nd USB generic HID support
.Sh SYNOPSIS
.Cd "uhid* at uhub?"
.Pp
.Sh DESCRIPTION
The
.Nm
driver provides support for all HID (Human Interface Device) interfaces
in USB devices that do not have a special driver.
.Pp
The device handles the following
.Xr ioctl 2
calls:
.Pp
.Bl -tag -width indent -compact
.It Dv USB_GET_REPORT_DESC (struct usb_ctl_report_desc)
Get the HID report descriptor. Using
this descriptor the exact layout and meaning of data to/from
the device can be found. The report descriptor is delivered
without any processing.
.Bd -literal
struct usb_ctl_report_desc {
int size;
u_char data[1024]; /* filled data size will vary */
};
.Ed
.It Dv USB_SET_IMMED (int)
Sets the device in a mode where each
.Xr read 2
will return the current value of the input report. Normally
a
.Xr read 2
will only return the data that the device reports on its
interrupt pipe. This call may fail if the device does not support
this feature.
.It Dv USB_GET_REPORT (struct usb_ctl_report)
Get a report from the device without waiting for data on
the interrupt pipe. The
.Fa report
field indicates which report is requested. It should be
.Dv UHID_INPUT_REPORT ,
.Dv UHID_OUTPUT_REPORT ,
or
.Dv UHID_FEATURE_REPORT .
This call may fail if the device does not support
this feature.
.Bd -literal
struct usb_ctl_report {
int report;
u_char data[1024]; /* filled data size will vary */
};
.Ed
.El
.Pp
Use
.Xr read 2
to get data from the device. Data should be read in chunks of the
size prescribed by the report descriptor.
.Pp
Use
.Xr write 2
send data to the device. Data should be written in chunks of the
size prescribed by the report descriptor.
.Sh SEE ALSO
.Xr usbhidctl 1 ,
.Xr usb 3 ,
.Xr usb 4
.Sh HISTORY
The
.Nm
driver
appeared in
.Ox 2.6 .
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