Re: [PATCH] Input: Change BTN_TOOL_FINGER flag when hover event trigger

Hi Kt,

On Mon, May 16, 2016 at 07:27:25PM +0800, 廖崇榮 wrote:

Only ABS_DISTANCE is not enough for upper OS to distingiush hover event be
triggered from object from faraway to and close touchpad surface or from
object prepare to leave the touchpad surface. Add BTN_TOOL_FINGER flag to
help it.

                 object_from_faraway    object_inside_hover_area
object_touch_surface
BTN_TOUCH                 0                          0             1
BTN_TOOL_FINGER           0                          1              1
ABS_DISTANCE               0                           1             0

Signed-off by: Duson Lin [off-list ref]

I was wondering if we could do without modifying all the drivers that
are using input_mt_report_pointer_emulation(), by figuring out if we
should be emitting BTN_TOOL_FINGER right there:

"If device supports ABS_DISTANCE and does not support ABS_MT_DISTANCE and
ABS_DISTANCE != 0 is reported in current frame and there are no other
contacts then report BTN_TOOL_FINGER."

Thanks.

-- 
Dmitry
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