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authorPavel Machek <pavel@ucw.cz>2009-03-31 15:24:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-01 08:59:21 -0700
commit2b872903c5d66bccdf4306a35e3e94d4da8555d3 (patch)
tree5af8d1d6831238c51d9a206042c14815a221cd52 /Documentation
parent4b19449db074eec86ae31a96d3cdca4aa7f138ab (diff)
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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/hwmon/lis3lv02d20
1 files changed, 15 insertions, 5 deletions
diff --git a/Documentation/hwmon/lis3lv02d b/Documentation/hwmon/lis3lv02d
index 287f8c902656..effe949a7282 100644
--- a/Documentation/hwmon/lis3lv02d
+++ b/Documentation/hwmon/lis3lv02d
@@ -1,11 +1,11 @@
Kernel driver lis3lv02d
-==================
+=======================
Supported chips:
* STMicroelectronics LIS3LV02DL and LIS3LV02DQ
-Author:
+Authors:
Yan Burman <burman.yan@gmail.com>
Eric Piel <eric.piel@tremplin-utc.net>
@@ -15,7 +15,7 @@ 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
+Protection System 3D" or "HP 3D DriveGuard". It detects 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
@@ -27,7 +27,7 @@ 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.
+ position.
rate - reports the sampling rate of the accelerometer device in HZ
This driver also provides an absolute input class device, allowing
@@ -48,7 +48,7 @@ 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
+ 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)
@@ -59,3 +59,13 @@ 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.
+Q&A
+---
+
+Q: How do I safely simulate freefall? I have an HP "portable
+workstation" which has about 3.5kg and a plastic case, so letting it
+fall to the ground is out of question...
+
+A: The sensor is pretty sensitive, so your hands can do it. Lift it
+into free space, follow the fall with your hands for like 10
+centimeters. That should be enough to trigger the detection.