hpacel(4) - NetBSD Manual Pages

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HPACEL(4)               NetBSD 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 avail-
     able 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 suit-
     able 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).

NetBSD 6.1.2                   September 7, 2011                  NetBSD 6.1.2