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 implemented 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).