| HPACEL(4) | 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.
 
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).