linux-kernel - RE: [PATCH] Input: elants_i2c - Report resolution information for touch major

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Date:   Fri, 6 Mar 2020 15:46:55 +0800
From:   "Johnny.Chuang" <johnny.chuang@....com.tw>
To:     "'Peter Hutterer'" <peter.hutterer@...-t.net>,
        "'Johnny Chuang'" <johnny.chuang.emc@...il.com>
Cc:     "'Dmitry Torokhov'" <dmitry.torokhov@...il.com>,
        "'Benjamin Tissoires'" <benjamin.tissoires@...hat.com>,
        <linux-kernel@...r.kernel.org>, <linux-input@...r.kernel.org>,
        "'Jennifer Tsai'" <jennifer.tsai@....com.tw>,
        "'James Chen'" <james.chen@....com.tw>,
        "'Paul Liang'" <paul.liang@....com.tw>,
        "'Jeff Chuang'" <jeff.chuang@....com.tw>
Subject: RE: [PATCH] Input: elants_i2c - Report resolution information for touch major

> > > -----Original Message-----
> > > From: Peter Hutterer [mailto:peter.hutterer@...-t.net]
> > > Sent: Friday, February 28, 2020 6:36 AM
> > > To: Johnny Chuang
> > > Cc: Dmitry Torokhov; Benjamin Tissoires;
> > > linux-kernel@...r.kernel.org; linux-input@...r.kernel.org; Johnny
> > > Chuang; Jennifer Tsai; James Chen; Paul Liang; Jeff Chuang
> > > Subject: Re: [PATCH] Input: elants_i2c - Report resolution
> > > information for touch major
> > >
> > > On Thu, Feb 27, 2020 at 09:13:20AM +0800, Johnny Chuang wrote:
> > > > From: Johnny Chuang <johnny.chuang@....com.tw>
> > > >
> > > > This patch supports reporting resolution for ABS_MT_TOUCH_MAJOR
> > event.
> > > > This information is needed in showing pressure/width radius.
> > > >
> > > > Signed-off-by: Johnny Chuang <johnny.chuang@....com.tw>
> > > > ---
> > > >  drivers/input/touchscreen/elants_i2c.c | 1 +
> > > >  1 file changed, 1 insertion(+)
> > > >
> > > > diff --git a/drivers/input/touchscreen/elants_i2c.c
> > > b/drivers/input/touchscreen/elants_i2c.c
> > > > index 4911799..14c577c 100644
> > > > --- a/drivers/input/touchscreen/elants_i2c.c
> > > > +++ b/drivers/input/touchscreen/elants_i2c.c
> > > > @@ -1309,6 +1309,7 @@ static int elants_i2c_probe(struct
> > > > i2c_client
> > > *client,
> > > >  	input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0,
0);
> > > >  	input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res);
> > > >  	input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
> > > > +	input_abs_set_res(ts->input, ABS_MT_TOUCH_MAJOR, 1);
> > >
> > > official resolution for absinfo is "units per mm", so a value of 3
> > > would mean 3mm, is that correct?
> >
> > Correct.
> > This resolution (1 unit/mm) is for all elan I2C touchscreen devices,
> > including the touchscreen devices in the future.
> > This information is from our firmware members.
> 
> Hi Peter / Benjamin,
> Could you help to review and approve this patch?
> 

Hi Peter / Benjamin,
HP project Mordin mass production on 2020/3/10. ODM needs to upgrade new
image with this patch to verify.
Because ODM can not get the image link from Google, already delay verify
schedule.
Please help to review and approve this patch ASAP. Thank you very much.

> >
> > >
> > > Not that it matters too much, since touch major is already all over
> > > the place and needs userspace overrides for every device but it'd be
> > > nice to at least make this useful out of the box on one device class.
> > >
> > > Reviewed-by: Peter Hutterer <peter.hutterer@...-t.net>
> > >
> > > otherwise
> > >
> > > Cheers,
> > >    Peter
> > >
> > > >
> > > >  	error = input_register_device(ts->input);
> > > >  	if (error) {
> > > > --
> > > > 2.7.4
> > > >