freebsd-dev/share/man/man4/uhid.4

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.Dd November 22, 2006
.Dt UHID 4
.Os
.Sh NAME
.Nm uhid
.Nd USB generic HID support
.Sh SYNOPSIS
To compile this driver into the kernel,
place the following line in your
kernel configuration file:
.Bd -ragged -offset indent
.Cd "device uhid"
.Ed
.Pp
Alternatively, to load the driver as a
module at boot time, place the following line in
.Xr loader.conf 5 :
.Bd -literal -offset indent
uhid_load="YES"
.Ed
.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     ucrd_size;
    u_char  ucrd_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 ucr_report;
	u_char	ucr_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 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.