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ULED(4) Device Drivers Manual ULED(4)

NAME

uled —
USB LED driver

SYNOPSIS

To compile this driver into the kernel, place the following lines into your kernel configuration file:
device uled
device usb

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

uled_load="YES"

DESCRIPTION

The uled driver provides support for the Dream Cheeky WebMail Notifier device.

Subsequently, the /dev/uled0 device can be used by userland applications.

IOCTLS

The following ioctl(2) commands can be performed on /dev/uled0, which are defined in <dev/usb/uled_ioctl.h>:
The command returns LED colors with values for RGB. This ioctl(2) takes the following structure: 
struct uled_color {
	uint8_t	red;
	uint8_t	green;
	uint8_t	blue;
};
The command sets LED colors with values for RGB. It uses the same structure as above.

FILES

/dev/uled0
blocking device node

SEE ALSO

ohci(4), uhci(4), usb(4)

AUTHORS

The uled driver was written by Kevin Lo <kevlo@FreeBSD.org>.
September 5, 2014 Linux 4.9.0-9-amd64