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author | Ingo Molnar <mingo@elte.hu> | 2008-11-18 16:48:49 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-11-18 16:48:49 +0100 |
commit | 73f56c0d35e6427081a4eabd620d8b8d8a35bd09 (patch) | |
tree | 9fe1a2577baea03f3a6ec4a5e79f3ff26c4ee0ae /Documentation/hwmon/lis3lv02d | |
parent | 0af40a4b1050c050e62eb1dc30b82d5ab22bf221 (diff) | |
parent | 8501c45cc32c311ae755a2d5ac8c4a5f04908d42 (diff) |
Merge branch 'iommu-fixes-2.6.28' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux-2.6-iommu into x86/urgent
Diffstat (limited to 'Documentation/hwmon/lis3lv02d')
-rw-r--r-- | Documentation/hwmon/lis3lv02d | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/Documentation/hwmon/lis3lv02d b/Documentation/hwmon/lis3lv02d new file mode 100644 index 00000000000..65dfb0c0fd6 --- /dev/null +++ b/Documentation/hwmon/lis3lv02d @@ -0,0 +1,49 @@ +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. + |