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GPIOLOCK(4)                  Device Drivers Manual                 GPIOLOCK(4)

     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.

     gpio(4), intro(4)

     The gpiolock driver first appeared in NetBSD 6.0.

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

NetBSD 8.0                      August 21, 2009                     NetBSD 8.0