| HPACEL(4) | Device Drivers Manual | HPACEL(4) | 
hpacel —
hpacel* at acpi?
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.
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.
hpacel device driver appeared in
  NetBSD 6.0.
hpacel driver only reports the readings from the
  accelerometer via
  sysmon_envsys(9).
| September 7, 2011 | NetBSD 10.1 |