1.\" $NetBSD: hpacel.4,v 1.4 2011/09/07 08:54:41 jruoho Exp $ 2.\" 3.\" Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi> 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Neither the name of the author nor the names of any 12.\" contributors may be used to endorse or promote products derived 13.\" from this software without specific prior written permission. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS 16.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 17.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 19.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25.\" POSSIBILITY OF SUCH DAMAGE. 26.\" 27.Dd September 7, 2011 28.Dt HPACEL 4 29.Os 30.Sh NAME 31.Nm hpacel 32.Nd HP 3D DriveGuard accelerometer 33.Sh SYNOPSIS 34.Cd "hpacel* at acpi?" 35.Sh DESCRIPTION 36The 37.Nm 38device driver supports accelerometers that are 39commonly available in Hewlett-Packard laptops. 40The supported chip is 41.Dv LIS3LV02DL 42from STMicroelectronics, although other chips from the same family, such as 43.Dv LIS3LV02DQ , 44may also work, provided that the vendor has implemented suitable 45.Dv ACPI 46access methods. 47.Pp 48The 49.Nm 50driver reports the acceleration readings of the X-, Y-, and Z-axis 51via the 52.Xr envsys 4 53.Tn API 54and the 55.Xr envstat 8 56command. 57.Sh SEE ALSO 58.Xr acpi 4 , 59.Xr aps 4 , 60.Xr hpqlb 4 , 61.Xr wmihp 4 62.Rs 63.%A STMicroelectronics 64.%T "LIS3LV02DL: 3-Axis - \*(Pm\* 2g/\*(Pm\* 6g digital output \ 65low voltage linear accelerometer. AN2381 Application Note" 66.%N Revision 1 67.%D June, 2006 68.%U http://www.st.com/stonline/products/literature/anp/12441.pdf 69.Re 70.Sh HISTORY 71The 72.Nm 73device driver appeared in 74.Nx 6.0 . 75.Sh AUTHORS 76.An Jukka Ruohonen 77.Aq jruohonen@iki.fi 78.Sh BUGS 79The used accelerometer chip is capable of generating wake-up, 80direction detection, and free-fall interrupts. 81In the ideal situation these could be used to evoke possible emergency action. 82However, the 83.Nm 84driver only reports the readings from the accelerometer via 85.Xr sysmon_envsys 9 . 86