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, June, 2006, http://www.st.com/stonline/products/literature/anp/12441.pdf.

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).