netbsd man page for gpiolock

GPIOLOCK(4)						   BSD Kernel Interfaces Manual 					       GPIOLOCK(4)

NAME
     gpiolock -- support for multi-position keylocks attached to GPIO pins

SYNOPSIS
     gpiolock* at gpio? offset ? mask ?
     gpiolock* at gpio?

DESCRIPTION
     The gpiolock driver allows connecting of multi-position keylocks over GPIO pins.  The keylock driver registers with an in-kernel keylock sup-
     porting system and provides kauth(9) support through an experimental security model.  The keylock state can be queried using the hw.keylock
     sysctl variables.	Only locks with 2-4 positions are currently supported.	The pin number is specified in the kernel configuration with the
     offset locator.  The mask locator denotes the pins used for the lock (minimum 2, maximum 4 pins are used).  The offset and mask can also be
     specified when gpiolock is attached at runtime using the GPIOATTACH ioctl(2) on the gpio(4) device.

SEE ALSO
     gpio(4), intro(4)

HISTORY
     The gpiolock driver first appeared in NetBSD 6.0.

AUTHORS
     The gpiolock driver was written by Marc Balmer <marc@msys.ch>.

BSD
								  August 21, 2009							       BSD