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

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Date:	Mon, 16 May 2016 10:53:42 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	廖崇榮 <kt.liao@....com.tw>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	zac.hsieh@....com.tw,
	黃世鵬 經理 <phoenix@....com.tw>,
	'Charles Mooney' <charliemooney@...gle.com>,
	'Agnes Cheng' <agnescheng@...gle.com>
Subject: 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 <dusonlin@....com.tw>

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