| Kernel driver lis3lv02d |
| ================== |
| |
| Supported chips: |
| |
| * STMicroelectronics LIS3LV02DL and LIS3LV02DQ |
| |
| Author: |
| Yan Burman <burman.yan@gmail.com> |
| Eric Piel <eric.piel@tremplin-utc.net> |
| |
| |
| Description |
| ----------- |
| |
| This driver provides support for the accelerometer found in various HP laptops |
| sporting the feature officially called "HP Mobile Data Protection System 3D" or |
| "HP 3D DriveGuard". It detect automatically laptops with this sensor. Known models |
| (for now the HP 2133, nc6420, nc2510, nc8510, nc84x0, nw9440 and nx9420) will |
| have their axis automatically oriented on standard way (eg: you can directly |
| play neverball). The accelerometer data is readable via |
| /sys/devices/platform/lis3lv02d. |
| |
| Sysfs attributes under /sys/devices/platform/lis3lv02d/: |
| position - 3D position that the accelerometer reports. Format: "(x,y,z)" |
| calibrate - read: values (x, y, z) that are used as the base for input class device operation. |
| write: forces the base to be recalibrated with the current position. |
| rate - reports the sampling rate of the accelerometer device in HZ |
| |
| This driver also provides an absolute input class device, allowing |
| the laptop to act as a pinball machine-esque joystick. |
| |
| Axes orientation |
| ---------------- |
| |
| For better compatibility between the various laptops. The values reported by |
| the accelerometer are converted into a "standard" organisation of the axes |
| (aka "can play neverball out of the box"): |
| * When the laptop is horizontal the position reported is about 0 for X and Y |
| and a positive value for Z |
| * If the left side is elevated, X increases (becomes positive) |
| * If the front side (where the touchpad is) is elevated, Y decreases (becomes negative) |
| * If the laptop is put upside-down, Z becomes negative |
| |
| If your laptop model is not recognized (cf "dmesg"), you can send an email to the |
| authors to add it to the database. When reporting a new laptop, please include |
| the output of "dmidecode" plus the value of /sys/devices/platform/lis3lv02d/position |
| in these four cases. |
| |