86 lines
2.7 KiB
Groff
86 lines
2.7 KiB
Groff
.\" $NetBSD: hpacel.4,v 1.4 2011/09/07 08:54:41 jruoho Exp $
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.\"
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.\" Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Neither the name of the author nor the names of any
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd September 7, 2011
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.Dt HPACEL 4
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.Os
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.Sh NAME
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.Nm hpacel
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.Nd HP 3D DriveGuard accelerometer
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.Sh SYNOPSIS
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.Cd "hpacel* at acpi?"
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.Sh DESCRIPTION
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The
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.Nm
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device driver supports accelerometers that are
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commonly available in Hewlett-Packard laptops.
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The supported chip is
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.Dv LIS3LV02DL
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from STMicroelectronics, although other chips from the same family, such as
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.Dv LIS3LV02DQ ,
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may also work, provided that the vendor has implemented suitable
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.Dv ACPI
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access methods.
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.Pp
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The
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.Nm
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driver reports the acceleration readings of the X-, Y-, and Z-axis
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via the
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.Xr envsys 4
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.Tn API
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and the
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.Xr envstat 8
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command.
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.Sh SEE ALSO
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.Xr acpi 4 ,
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.Xr aps 4 ,
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.Xr hpqlb 4 ,
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.Xr wmihp 4
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.Rs
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.%A STMicroelectronics
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.%T "LIS3LV02DL: 3-Axis - \*(Pm\* 2g/\*(Pm\* 6g digital output \
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low voltage linear accelerometer. AN2381 Application Note"
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.%N Revision 1
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.%D June, 2006
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.%U http://www.st.com/stonline/products/literature/anp/12441.pdf
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.Re
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.Sh HISTORY
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The
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.Nm
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device driver appeared in
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.Nx 6.0 .
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.Sh AUTHORS
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.An Jukka Ruohonen
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.Aq jruohonen@iki.fi
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.Sh BUGS
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The used accelerometer chip is capable of generating wake-up,
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direction detection, and free-fall interrupts.
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In the ideal situation these could be used to evoke possible emergency action.
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However, the
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.Nm
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driver only reports the readings from the accelerometer via
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.Xr sysmon_envsys 9 .
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