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authorSamu Onkalo <samu.p.onkalo@nokia.com>2009-12-14 18:01:46 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 08:53:36 -0800
commite956e6b77054f91580deb81ba6389cc8c8ce67ef (patch)
tree943b5e68edb4e505c3957421b48e90aac8057d51 /Documentation/hwmon/lis3lv02d
parent32496c76b777752ba84b125bebfb0cc498f5602c (diff)
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lis3: update documentation to match latest changes
[akpm@linux-foundation.org: s/q/g/ (Randy)] Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com> Acked-by: Éric Piel <Eric.Piel@tremplin-utc.net> Cc: Pavel Machek <pavel@ucw.cz> Cc: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/hwmon/lis3lv02d')
-rw-r--r--Documentation/hwmon/lis3lv02d31
1 files changed, 24 insertions, 7 deletions
diff --git a/Documentation/hwmon/lis3lv02d b/Documentation/hwmon/lis3lv02d
index 21f0902..06534f2 100644
--- a/Documentation/hwmon/lis3lv02d
+++ b/Documentation/hwmon/lis3lv02d
@@ -20,18 +20,35 @@ sporting the feature officially called "HP Mobile Data Protection System 3D" or
models (full list can be found in drivers/hwmon/hp_accel.c) 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.
+/sys/devices/platform/lis3lv02d. Reported values are scaled
+to mg values (1/1000th of earth gravity).
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
+rate - read reports the sampling rate of the accelerometer device in HZ.
+ write changes sampling rate of the accelerometer device.
+ Only values which are supported by HW are accepted.
+selftest - performs selftest for the chip as specified by chip manufacturer.
This driver also provides an absolute input class device, allowing
-the laptop to act as a pinball machine-esque joystick.
+the laptop to act as a pinball machine-esque joystick. Joystick device can be
+calibrated. Joystick device can be in two different modes.
+By default output values are scaled between -32768 .. 32767. In joystick raw
+mode, joystick and sysfs position entry have the same scale. There can be
+small difference due to input system fuzziness feature.
+Events are also available as input event device.
+
+Selftest is meant only for hardware diagnostic purposes. It is not meant to be
+used during normal operations. Position data is not corrupted during selftest
+but interrupt behaviour is not guaranteed to work reliably. In test mode, the
+sensing element is internally moved little bit. Selftest measures difference
+between normal mode and test mode. Chip specifications tell the acceptance
+limit for each type of the chip. Limits are provided via platform data
+to allow adjustment of the limits without a change to the actual driver.
+Seltest returns either "OK x y z" or "FAIL x y z" where x, y and z are
+measured difference between modes. Axes are not remapped in selftest mode.
+Measurement values are provided to help HW diagnostic applications to make
+final decision.
On HP laptops, if the led infrastructure is activated, support for a led
indicating disk protection will be provided as /sys/class/leds/hp::hddprotect.