Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
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.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.
p 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 .