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UHID(4)               DragonFly Kernel Interfaces Manual               UHID(4)


NAME

     uhid -- USB generic HID support


SYNOPSIS

     To compile this driver into the kernel, place the following line in your
     kernel configuration file:

           device uhid

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):

           uhid_load="YES"


DESCRIPTION

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

     The device handles the following ioctl(2) calls:

     USB_GET_REPORT_ID (int)
             Get the report identifier used by this HID report.

     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     ucrd_size;
                 u_char  ucrd_data[1024];    /* filled data size will vary */
             };

     USB_SET_IMMED (int)
             Sets the device in a mode where each read(2) will return the
             current value of the input report.  Normally a 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.

     USB_GET_REPORT (struct usb_ctl_report)
             Get a report from the device without waiting for data on the
             interrupt pipe.  The report field indicates which report is
             requested.  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 ucr_report;
                     u_char  ucr_data[1024]; /* used data size will vary */
             };

     USB_SET_REPORT (struct usb_ctl_report)
             Set a report in the device.  The report field indicates which
             report is to be set.  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.

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


FILES

     /dev/uhid?


SEE ALSO

     usbhidctl(1), usb(4)


HISTORY

     The uhid driver appeared in NetBSD 1.4.  This manual page was adopted
     from NetBSD by Tom Rhodes <trhodes@FreeBSD.org> in April 2002.

DragonFly 3.7                   March 14, 2014                   DragonFly 3.7

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