HPACEL(4) FreeBSD 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 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 <
[email protected]>
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).
FreeBSD 14.1-RELEASE-p8 September 7, 2011 FreeBSD 14.1-RELEASE-p8