Input: define INPUT_PROP_ACCELEROMETER behavior

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]> Acked-by: Jiri Kosina <[email protected]> Reviewed-by: Bastien Nocera <[email protected]> Signed-off-by: Dmitry Torokhov <[email protected]>
cbmeeks · Mar 31, 2015 · 3309677 · 3309677
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commit 3309677
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diff --git 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.