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NetBSD 6.1.5 - man page for gpiolock (netbsd section 4)

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GPIOLOCK(4)			   BSD Kernel Interfaces 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 key-
     lock driver registers with an in-kernel keylock supporting system and provides kauth(9) sup-
     port 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 loca-
     tor 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>.

BSD					 August 21, 2009				      BSD
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