UHID(4)                   OpenBSD Programmer's Manual                  UHID(4)

NAME
     uhid - USB generic HID support

SYNOPSIS
     uhid* at uhub?

DESCRIPTION
     The uhid driver provides support for all HID (Human Interface Device) in-
     terfaces in USB devices that do not have a special driver.

     The device handles the following ioctl(2) calls:

     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.

             struct usb_ctl_report_desc {
                 int     size;
                 u_char  data[1024]; /* filled data size will vary */
             };
     USB_SET_IMMED (int)
             Sets the device in a mode where each read(2) will return the cur-
             rent value of the input report.  Normally a read(2) will only re-
             turn the data that the device reports on its interrupt pipe.
             This call may fail if the device does not support this feature.
     USB_GET_REPORT (struct usb_ctl_report)
             Get a report from the device without waiting for data on the in-
             terrupt pipe.  The report field indicates which report is re-
             quested.  It should be UHID_INPUT_REPORT, UHID_OUTPUT_REPORT, or
             UHID_FEATURE_REPORT. This call may fail if the device does not
             support this feature.

             struct usb_ctl_report {
                     int report;
                     u_char  data[1024];     /* filled data size will vary */
             };

     Use read(2) to get data from the device.  Data should be read in chunks
     of the size prescribed by the report descriptor.

     Use write(2) send data to the device.  Data should be written in chunks
     of the size prescribed by the report descriptor.

SEE ALSO
     usbhidctl(1), usb(3), usb(4)

HISTORY
     The uhid driver appeared in OpenBSD 2.6.

OpenBSD 3.0                      July 12, 1998                               1
