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- 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.
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