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Date:	Mon, 16 May 2016 10:53:42 -0700
From:	Dmitry Torokhov <>
To:	廖崇榮 <>
	黃世鵬 經理 <>,
	'Charles Mooney' <>,
	'Agnes Cheng' <>
Subject: Re: [PATCH] Input: Change BTN_TOOL_FINGER flag when hover event

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 <>

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."



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