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HPACEL(4)		 BSD Kernel Interfaces Manual		     HPACEL(4)

NAME
     hpacel — HP 3D DriveGuard accelerometer

SYNOPSIS
     hpacel* at acpi?

DESCRIPTION
     The hpacel device driver supports accelerometers that are commonly avail‐
     able in Hewlett-Packard laptops.  The supported chip is LIS3LV02DL from
     STMicroelectronics, although other chips from the same family, such as
     LIS3LV02DQ, may also work, provided that the vendor has implemented suit‐
     able ACPI access methods.

     The hpacel driver reports the acceleration readings of the X-, Y-, and Z-
     axis via the envsys(4) API and the envstat(8) command.

SEE ALSO
     acpi(4), aps(4), hpqlb(4), wmihp(4)

     STMicroelectronics, LIS3LV02DL: 3-Axis - ±2g/±6g digital output low
     voltage linear accelerometer. AN2381 Application Note, Revision 1,
     http://www.st.com/stonline/products/literature/anp/12441.pdf, June, 2006.

HISTORY
     The hpacel device driver appeared in NetBSD 6.0.

AUTHORS
     Jukka Ruohonen ⟨jruohonen@iki.fi⟩

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 hpacel driver
     only reports the readings from the accelerometer via sysmon_envsys(9).

BSD			       September 7, 2011			   BSD

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