gpiolock —
support for multi-position keylocks attached to GPIO pins
gpiolock* at gpio? offset ? mask ?
gpiolock* at gpio?
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.
The gpiolock driver first appeared in
NetBSD 6.0.
The gpiolock driver was written by Marc
Balmer
<marc@msys.ch>.