HPACEL(4)

HPACEL(4) | Device Drivers 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 ⟨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).

September 7, 2011 | NetBSD 11.0