FreeBSD-5.3/share/man/man4/uhid.4

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.\" $FreeBSD: src/share/man/man4/uhid.4,v 1.4 2004/06/24 05:09:15 imp Exp $
.\"
.Dd July 12, 1998
.Dt UHID 4
.Os
.Sh NAME
.Nm uhid
.Nd USB generic HID support
.Sh SYNOPSIS
.Cd "device uhid"
.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_REPORT_ID Pq Vt int
Get the report identifier used by this HID report.
.It Dv USB_GET_REPORT_DESC Pq Vt "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 Pq Vt 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 Pq Vt "struct usb_ctl_report"
Get a report from the device without waiting for data on
the interrupt pipe.
The
.Va 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 */
};
.Ed
.It Dv USB_SET_REPORT Pq Vt "struct usb_ctl_report"
Set a report in the device.
The
.Va 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.
.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
to 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 /dev/uhid?"
.It Pa /dev/uhid?
.El
.Sh SEE ALSO
.Xr usbhidctl 1 ,
.Xr usb 3 ,
.Xr uhidev 4 ,
.Xr usb 4
.Sh HISTORY
The
.Nm
driver
appeared in
.Nx 1.4 .
This manual page was adopted from
.Nx
by
.An Tom Rhodes Aq trhodes@FreeBSD.org
in April 2002.