hp_accel: small documentation updates
Fix english in Documentation, add "how to test" description. Signed-off-by: Pavel Machek <pavel@suse.cz> Cc: Eric Piel <eric.piel@tremplin-utc.net> Cc: Vladimir Botka <vbotka@suse.cz> Cc: <Quoc.Pham@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1,11 +1,11 @@
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Kernel driver lis3lv02d
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Kernel driver lis3lv02d
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==================
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=======================
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Supported chips:
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Supported chips:
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* STMicroelectronics LIS3LV02DL and LIS3LV02DQ
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* STMicroelectronics LIS3LV02DL and LIS3LV02DQ
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Author:
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Authors:
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Yan Burman <burman.yan@gmail.com>
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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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Eric Piel <eric.piel@tremplin-utc.net>
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@ -15,7 +15,7 @@ Description
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This driver provides support for the accelerometer found in various HP
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This driver provides support for the accelerometer found in various HP
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laptops sporting the feature officially called "HP Mobile Data
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laptops sporting the feature officially called "HP Mobile Data
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Protection System 3D" or "HP 3D DriveGuard". It detect automatically
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Protection System 3D" or "HP 3D DriveGuard". It detects automatically
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laptops with this sensor. Known models (for now the HP 2133, nc6420,
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laptops with this sensor. Known models (for now the HP 2133, nc6420,
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nc2510, nc8510, nc84x0, nw9440 and nx9420) will have their axis
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nc2510, nc8510, nc84x0, nw9440 and nx9420) will have their axis
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automatically oriented on standard way (eg: you can directly play
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automatically oriented on standard way (eg: you can directly play
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@ -27,7 +27,7 @@ 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
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calibrate - read: values (x, y, z) that are used as the base for input
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class device operation.
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class device operation.
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write: forces the base to be recalibrated with the current
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write: forces the base to be recalibrated with the current
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position.
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position.
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rate - reports the sampling rate of the accelerometer device in HZ
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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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This driver also provides an absolute input class device, allowing
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@ -48,7 +48,7 @@ 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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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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(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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* 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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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 left side is elevated, X increases (becomes positive)
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* If the front side (where the touchpad is) is elevated, Y decreases
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* If the front side (where the touchpad is) is elevated, Y decreases
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(becomes negative)
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(becomes negative)
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@ -59,3 +59,13 @@ email to the authors to add it to the database. When reporting a new
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laptop, please include the output of "dmidecode" plus the value of
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laptop, please include the output of "dmidecode" plus the value of
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/sys/devices/platform/lis3lv02d/position in these four cases.
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/sys/devices/platform/lis3lv02d/position in these four cases.
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Q&A
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---
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Q: How do I safely simulate freefall? I have an HP "portable
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workstation" which has about 3.5kg and a plastic case, so letting it
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fall to the ground is out of question...
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A: The sensor is pretty sensitive, so your hands can do it. Lift it
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into free space, follow the fall with your hands for like 10
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centimeters. That should be enough to trigger the detection.
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