linux-kernel - Re: [PATCH v2] Input: elants_i2c

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Date:   Thu, 9 Apr 2020 12:51:44 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Peter Hutterer <peter.hutterer@...-t.net>
Cc:     Johnny Chuang <johnny.chuang.emc@...il.com>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        Rob Schonberger <robsc@...gle.com>,
        Johnny Chuang <johnny.chuang@....com.tw>,
        James Chen <james.chen@....com.tw>,
        Jennifer Tsai <jennifer.tsai@....com.tw>,
        Paul Liang <paul.liang@....com.tw>,
        Jeff Chuang <jeff.chuang@....com.tw>
Subject: Re: [PATCH v2] Input: elants_i2c - support palm detection

On Tue, Mar 31, 2020 at 08:53:17AM +1000, Peter Hutterer wrote:
> On Mon, Mar 30, 2020 at 03:02:36PM +0800, Johnny Chuang wrote:
> > From: Johnny Chuang <johnny.chuang@....com.tw>
> > 
> > Elan define finger/palm detection on the least significant bit of byte 33.
> > The default value is 1 for all firmwares, which report as MT_TOOL_FINGER.
> > If firmware support palm detection, the bit will change to 0 and
> > report as MT_TOOL_PALM when firmware detecting palm.
> > 
> > Signed-off-by: Johnny Chuang <johnny.chuang@....com.tw>
> 
> Reviewed-by: Peter Hutterer <peter.hutterer@...-t.net>
> 
> Cheers,
>    Peter
>    
> > ---
> > Changes in v2:
> > 	- Modify MT_TOOL_MAX to MT_TOOL_PALM
> > 
> >  drivers/input/touchscreen/elants_i2c.c | 11 ++++++++++-
> >  1 file changed, 10 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
> > index 14c577c..93211fe 100644
> > --- a/drivers/input/touchscreen/elants_i2c.c
> > +++ b/drivers/input/touchscreen/elants_i2c.c
> > @@ -73,6 +73,7 @@
> >  #define FW_POS_STATE		1
> >  #define FW_POS_TOTAL		2
> >  #define FW_POS_XY		3
> > +#define FW_POS_TOOL_TYPE	33
> >  #define FW_POS_CHECKSUM		34
> >  #define FW_POS_WIDTH		35
> >  #define FW_POS_PRESSURE		45
> > @@ -842,6 +843,7 @@ static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
> >  {
> >  	struct input_dev *input = ts->input;
> >  	unsigned int n_fingers;
> > +	unsigned int tool_type;
> >  	u16 finger_state;
> >  	int i;
> >  
> > @@ -852,6 +854,12 @@ static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
> >  	dev_dbg(&ts->client->dev,
> >  		"n_fingers: %u, state: %04x\n",  n_fingers, finger_state);
> >  
> > +	/* Note: all fingers have the same tool type */
> > +	if (buf[FW_POS_TOOL_TYPE] & 0x01)
> > +		tool_type = MT_TOOL_FINGER;
> > +	else
> > +		tool_type = MT_TOOL_PALM;

I changed this to

	tool_type = buf[FW_POS_TOOL_TYPE] & BIT(0) ?
			MT_TOOL_FINGER : MT_TOOL_PALM;

to be a bit more compact, and applied.

Thanks.

-- 
Dmitry