Spell out what this property means to userspace. If the property is set, all
directional axes must be accelerometer axes, any other axes are left as-is.
This allows an accelerometer device to e.g. have an ABS_WHEEL.

It is not permitted to mix normal directional axes and accelerometer axes on
the same device node.

Signed-off-by: Peter Hutterer <[email protected]>
---
I think this is the most sensible definition of what to expect when this
property is set on a device.

 Documentation/input/event-codes.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/input/event-codes.txt 
b/Documentation/input/event-codes.txt
index 9d13600..1756b97 100644
--- a/Documentation/input/event-codes.txt
+++ b/Documentation/input/event-codes.txt
@@ -294,6 +294,12 @@ accordingly. This property does not affect kernel behavior.
 The kernel does not provide button emulation for such devices but treats
 them as any other INPUT_PROP_BUTTONPAD device.
 
+INPUT_PROP_ACCELEROMETER
+-------------------------
+Directional axes on this device (absolute and/or relative x, y, z) represent
+accelerometer data. All other axes retain their meaning. A device must not mix
+regular directional axes and accelerometer axes on the same event node.
+
 Guidelines:
 ==========
 The guidelines below ensure proper single-touch and multi-finger functionality.
-- 
2.3.3

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