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UHID(4) Device Drivers Manual UHID(4)

uhid — USB generic HID support

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"

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:

(int)
Get the report identifier used by this HID report.
(struct usb_gen_descriptor)
Get the HID report descriptor. Copies a maximum of ugd_maxlen bytes of the report descriptor data into the memory specified by ugd_data. Upon return ugd_actlen is set to the number of bytes copied. 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_gen_descriptor {
	void   *ugd_data;
	uint16_t ugd_maxlen;
	uint16_t ugd_actlen;
	uint8_t	ugd_report_type;
	...
};
(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.
(struct usb_gen_descriptor)
Get a report from the device without waiting for data on the interrupt pipe. Copies a maximum of ugd_maxlen bytes of the report data into the memory specified by ugd_data. Upon return ugd_actlen is set to the number of bytes copied. The ugd_report_type 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_gen_descriptor)
Set a report in the device. The ugd_report_type field indicates which report is to be set. It should be UHID_INPUT_REPORT, UHID_OUTPUT_REPORT, or UHID_FEATURE_REPORT. The value of the report is specified by the ugd_data and the ugd_maxlen fields. 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.

The following variables are available as both sysctl(8) variables and loader(8) tunables:

hw.usb.uhid.debug
Debug output level, where 0 is debugging disabled and larger values increase debug message verbosity. Default is 0.

/dev/uhid?
 

usbhidctl(1), usb(4)

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

July 1, 2018 FreeBSD-12.0