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 available 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 imple-
mented suitable 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
