NetBSD/share/man/man4/uhid.4

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.\" $NetBSD: uhid.4,v 1.14 2002/06/12 00:24:39 wiz Exp $
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Lennart Augustsson.
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.Dd July 12, 1998
.Dt UHID 4
.Os
.Sh NAME
.Nm uhid
.Nd USB generic HID support
.Sh SYNOPSIS
.Cd "uhid* at uhidev? reportid ?"
.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_ID (int)
Get the report identifier used by this HID report.
.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
.Dv 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]; /* used data size will vary */
};
.It Dv USB_SET_REPORT (struct usb_ctl_report)
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 .
This call may fail if the device does not support this feature.
.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 FILES
.Bl -tag -width Pa
.It Pa /dev/uhid?
.El
.Sh SEE ALSO
.Xr usbhidaction 1 ,
.Xr usbhidctl 1 ,
.Xr uhidev 4 ,
.Xr usb 4
.Sh HISTORY
The
.Nm
driver
appeared in
.Nx 1.4 .