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