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