68 lines
1.9 KiB
Groff
68 lines
1.9 KiB
Groff
.\" $NetBSD: gpiolock.4,v 1.4 2009/08/21 08:20:30 mbalmer Exp $
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.\"
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.\" Copyright (c) 2009 Marc Balmer <marc@msys.ch>
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.Dd August 21, 2009
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.Dt GPIOLOCK 4
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.Os
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.Sh NAME
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.Nm gpiolock
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.Nd support for multi-position keylocks attached to GPIO pins
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.Sh SYNOPSIS
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.Cd "gpiolock* at gpio? offset ? mask ?"
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.Cd "gpiolock* at gpio?"
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.Sh DESCRIPTION
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The
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.Nm
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driver allows connecting of multi-position keylocks over GPIO pins.
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The keylock driver registers with an in-kernel keylock supporting system
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and provides
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.Xr kauth 9
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support through an experimental security model.
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The keylock state can be queried using the hw.keylock sysctl variables.
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Only locks with 2-4 positions are currently supported.
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The pin number is specified in the kernel configuration with the
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.Ar offset
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locator.
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The
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.Ar mask
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locator denotes the pins used for the lock (minimum 2, maximum 4 pins are used).
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The
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.Ar offset
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and
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.Ar mask
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can also be specified when
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.Nm
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is attached at runtime using the
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.Dv GPIOATTACH
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.Xr ioctl 2
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on the
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.Xr gpio 4
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device.
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.Sh SEE ALSO
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.Xr gpio 4 ,
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.Xr intro 4
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Nx 6.0 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An Marc Balmer Aq marc@msys.ch .
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