GPIOLOCK(4) |
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 supporting 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.
HISTORY
The gpiolock driver first appeared in NetBSD 6.0.
AUTHORS
The gpiolock driver was written by Marc Balmer <marc@msys.ch>.