uhid(4) - NetBSD Manual Pages

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UHID(4)                 NetBSD Kernel Interfaces Manual                UHID(4)


NAME

     uhid -- USB generic HID support


SYNOPSIS

     uhid* at uhidev? reportid ? flags N


DESCRIPTION

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

     Normally the uhid driver is used when no other HID driver attaches to a
     device.  If ``flags 1'' is specified, the uhid driver will instead attach
     with a very high priority and always be used.  Together with the vendor
     and product locators on the uhidev(4) driver this can be used to force
     the uhid driver to be used for a certain device.

     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 cur-
             rent 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.

     USB_GET_DEVICEINFO (struct usb_device_info)
             Get an information summary for the device.  This call will not
             issue any USB transactions.

     USB_GET_STRING_DESC (struct usb_string_desc)
             Get a string descriptor for the given language id and string
             index.

             struct usb_string_desc {
                     int     usd_string_index;
                     int     usd_language_id;
                     usb_string_descriptor_t usd_desc;
             };

     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.


FILES

     /dev/uhid?


SEE ALSO

     usbhidaction(1), usbhidctl(1), uhidev(4), usb(4)


HISTORY

     The uhid driver appeared in NetBSD 1.4.  Support for the
     USB_GET_DEVICEINFO and USB_GET_STRING_DESC ioctls appeared in NetBSD 2.0.

NetBSD 5.1                     November 22, 2005                    NetBSD 5.1