HPACEL(4)               NetBSD 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).

NetBSD 7.0                     September 7, 2011                    NetBSD 7.0

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