HPACEL(4) BSD Kernel Interfaces Manual HPACEL(4)
hpacel -- HP 3D DriveGuard accelerometer
hpacel* at acpi?
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.
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.
The hpacel device driver appeared in NetBSD 6.0.
Jukka Ruohonen <firstname.lastname@example.org>
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
BSD September 7, 2011 BSD