1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
.\" $OpenBSD: uhid.4,v 1.20 2021/09/15 04:59:26 anton Exp $
.\" $NetBSD: uhid.4,v 1.13 2001/12/29 14:41:59 augustss Exp $
.\"
.\" Copyright (c) 1999, 2001 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.
.\"
.\" 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 $Mdocdate: September 15 2021 $
.Dt UHID 4
.Os
.Sh NAME
.Nm uhid
.Nd USB generic HID support
.Sh SYNOPSIS
.Cd "uhid* at uhidev?"
.Pp
.In dev/usb/usb.h
.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:
.Bl -tag -width indent
.It Dv USB_GET_DEVICEINFO Fa struct usb_device_info *devinfo
Get summarized information about the device.
.It Dv USB_GET_REPORT_ID Fa int *repid
Get the report identifier used by this HID report.
.It Dv USB_GET_REPORT_DESC Fa struct usb_ctl_report_desc *repdesc
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 ucrd_size;
u_char ucrd_data[1024]; /* filled data size will vary */
};
.Ed
.It Dv USB_GET_REPORT Fa struct usb_ctl_report *rep
Get a report from the device without waiting for data on
the interrupt pipe.
The
.Fa ucr_report
field indicates which report is requested.
It should be
.Dv UHID_INPUT_REPORT ,
.Dv UHID_OUTPUT_REPORT ,
or
.Dv UHID_FEATURE_REPORT .
.Bd -literal
struct usb_ctl_report {
int ucr_report;
u_char ucr_data[1024]; /* filled data size will vary */
};
.Ed
.It Dv USB_SET_REPORT Fa struct usb_ctl_report *rep
Set a report in the device.
The
.Dv report
field indicates which report is to be set.
It should be
.Dv UHID_INPUT_REPORT ,
.Dv UHID_OUTPUT_REPORT ,
or
.Dv UHID_FEATURE_REPORT .
.El
.Pp
The generic ioctls
.Dv FIONBIO
and
.Dv FIOASYNC
are supported by
.Nm .
.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
to send data to the device.
Equivalent to issuing an
.Xr ioctl 2
.Dv USB_SET_REPORT
request with the report set to
.Dv UHID_OUTPUT_REPORT .
Data should be written in chunks of the size prescribed by the report
descriptor.
.Sh FILES
.Bl -tag -width /dev/tun* -compact
.It Pa /dev/uhid*
.El
.Sh ERRORS
If
.Xr ioctl 2
fails,
.Xr errno 2
is set to one of the following:
.Bl -tag -width Er
.It Bq Er EIO
The device could not fulfill a
.Dv USB_GET_REPORT
or
.Dv USB_SET_REPORT
request.
.It Bq Er EINVAL
The report specified by the
.Fa ucr_report
field in a
.Dv USB_GET_REPORT
or
.Dv USB_SET_REPORT
request was invalid.
.It Bq Er ENOTTY
Unrecognized command.
.El
.Pp
If
.Xr read 2
fails,
.Xr errno 2
is set to one of the following:
.Bl -tag -width Er
.It Bq Er EIO
The device has already been detached.
.It Bq Er EWOULDBLOCK
Non-blocking I/O was selected and no data were available.
.El
.Pp
If
.Xr write 2
fails,
.Xr errno 2
is set to one of the following:
.Bl -tag -width Er
.It Bq Er EIO
The device has already been detached or the same device does not have a
corresponding output report.
.It Bq Er EMSGSIZE
The size of the supplied data exceeds the size of the output report.
.El
.Sh SEE ALSO
.Xr usbhidctl 1 ,
.Xr usbhid 3 ,
.Xr intro 4 ,
.Xr uhidev 4 ,
.Xr usb 4
.Sh HISTORY
The
.Nm
driver
appeared in
.Ox 2.6 .
|
