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input: mt: Add hovering distance axis

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Touch devices capable of hovering, i.e., fingers detected a
distance from the surface, are not supported by the current
input MT protocol. This patch adds ABS_MT_DISTANCE, which may
be used to indicate the distance between the contact and the
surface.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
This commit is contained in:
Henrik Rydberg 2010-12-06 10:05:43 +01:00
parent c5f4dec1ce
commit e42a98b520
2 changed files with 10 additions and 2 deletions
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3
include/linux/input.h
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@ -733,11 +733,12 @@ struct input_keymap_entry {
#define ABS_MT_BLOB_ID 0x38 /* Group a set of packets as a blob */
#define ABS_MT_TRACKING_ID 0x39 /* Unique ID of initiated contact */
#define ABS_MT_PRESSURE 0x3a /* Pressure on contact area */
#define ABS_MT_DISTANCE 0x3b /* Contact hover distance */
#ifdef __KERNEL__
/* Implementation details, userspace should not care about these */
#define ABS_MT_FIRST ABS_MT_TOUCH_MAJOR
#define ABS_MT_LAST ABS_MT_PRESSURE
#define ABS_MT_LAST ABS_MT_DISTANCE
#endif
#define ABS_MAX 0x3f