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Pavel Machek455fbdd2008-11-12 13:27:02 -08001Kernel driver lis3lv02d
2==================
3
4Supported chips:
5
6 * STMicroelectronics LIS3LV02DL and LIS3LV02DQ
7
8Author:
9 Yan Burman <burman.yan@gmail.com>
10 Eric Piel <eric.piel@tremplin-utc.net>
11
12
13Description
14-----------
15
Pavel Machek219beb22009-01-15 13:51:24 -080016This driver provides support for the accelerometer found in various HP
17laptops sporting the feature officially called "HP Mobile Data
18Protection System 3D" or "HP 3D DriveGuard". It detect automatically
19laptops with this sensor. Known models (for now the HP 2133, nc6420,
20nc2510, nc8510, nc84x0, nw9440 and nx9420) will have their axis
21automatically oriented on standard way (eg: you can directly play
22neverball). The accelerometer data is readable via
Pavel Machek455fbdd2008-11-12 13:27:02 -080023/sys/devices/platform/lis3lv02d.
24
25Sysfs attributes under /sys/devices/platform/lis3lv02d/:
26position - 3D position that the accelerometer reports. Format: "(x,y,z)"
Pavel Machek219beb22009-01-15 13:51:24 -080027calibrate - read: values (x, y, z) that are used as the base for input
28 class device operation.
29 write: forces the base to be recalibrated with the current
30 position.
Pavel Machek455fbdd2008-11-12 13:27:02 -080031rate - reports the sampling rate of the accelerometer device in HZ
32
33This driver also provides an absolute input class device, allowing
34the laptop to act as a pinball machine-esque joystick.
35
36Axes orientation
37----------------
38
39For better compatibility between the various laptops. The values reported by
40the accelerometer are converted into a "standard" organisation of the axes
41(aka "can play neverball out of the box"):
42 * When the laptop is horizontal the position reported is about 0 for X and Y
43and a positive value for Z
44 * If the left side is elevated, X increases (becomes positive)
Pavel Machek219beb22009-01-15 13:51:24 -080045 * If the front side (where the touchpad is) is elevated, Y decreases
46 (becomes negative)
Pavel Machek455fbdd2008-11-12 13:27:02 -080047 * If the laptop is put upside-down, Z becomes negative
48
Pavel Machek219beb22009-01-15 13:51:24 -080049If your laptop model is not recognized (cf "dmesg"), you can send an
50email to the authors to add it to the database. When reporting a new
51laptop, please include the output of "dmidecode" plus the value of
52/sys/devices/platform/lis3lv02d/position in these four cases.
Pavel Machek455fbdd2008-11-12 13:27:02 -080053