NAME
hpacel —
HP 3D DriveGuard
accelerometer
SYNOPSIS
hpacel* at acpi?
DESCRIPTION
Thehpacel 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).