linux-kernel - RE: [PATCH v2] Input: elants_i2c - Report resolution of ABS_MT_TOUCH

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Date:   Fri, 28 Aug 2020 09:44:58 +0800
From:   "Johnny.Chuang" <johnny.chuang@....com.tw>
To:     "'Harry Cutts'" <hcutts@...omium.org>,
        "'Johnny Chuang'" <johnny.chuang.emc@...il.com>
Cc:     "'Dmitry Torokhov'" <dmitry.torokhov@...il.com>,
        "'Benjamin Tissoires'" <benjamin.tissoires@...hat.com>,
        "'Peter Hutterer'" <peter.hutterer@...-t.net>,
        "'lkml'" <linux-kernel@...r.kernel.org>,
        "'linux-input'" <linux-input@...r.kernel.org>,
        "'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 - Report resolution of ABS_MT_TOUCH_MAJOR by FW information.

> On Wed, 26 Aug 2020 at 18:44, Johnny Chuang
> <johnny.chuang.emc@...il.com> wrote:
> >
> > This patch adds a new behavior to report touch major resolution based
> > on information provided by firmware.
> >
> > In initial process, driver acquires touch information from touch ic.
> > This information contains of one flag about reporting resolution of
> > ABS_MT_TOUCH_MAJOR is needed, or not.
> > Touch driver will report touch major resolution after geting this flag.
> 
> I think this paragraph needs updating now that the firmware's reporting the
> actual resolution instead of a flag.

Thanks Harry, I will update patch v3 for this.

> 
> >
> > Signed-off-by: Johnny Chuang <johnny.chuang.emc@...il.com>
> > ---
> > Changes in v2:
> >   - register real resolution instead of true/false.
> > ---
> >  drivers/input/touchscreen/elants_i2c.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/drivers/input/touchscreen/elants_i2c.c
> > b/drivers/input/touchscreen/elants_i2c.c
> > index b0bd5bb..dc7f4a5 100644
> > --- a/drivers/input/touchscreen/elants_i2c.c
> > +++ b/drivers/input/touchscreen/elants_i2c.c
> > @@ -151,6 +151,7 @@ struct elants_data {
> >
> >         bool wake_irq_enabled;
> >         bool keep_power_in_suspend;
> > +       u8 report_major_resolution;
> >
> >         /* Must be last to be used for DMA operations */
> >         u8 buf[MAX_PACKET_SIZE] ____cacheline_aligned; @@ -459,6
> > +460,9 @@ static int elants_i2c_query_ts_info(struct elants_data *ts)
> >         rows = resp[2] + resp[6] + resp[10];
> >         cols = resp[3] + resp[7] + resp[11];
> >
> > +       /* Decide if report resolution of ABS_MT_TOUCH_MAJOR */
> > +       ts->report_major_resolution = resp[16];
> > +
> >         /* Process mm_to_pixel information */
> >         error = elants_i2c_execute_command(client,
> >                                            get_osr_cmd,
> > sizeof(get_osr_cmd), @@ -1325,6 +1329,8 @@ static int
> elants_i2c_probe(struct i2c_client *client,
> >                              0, MT_TOOL_PALM, 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);
> > +       if (ts->report_major_resolution > 0)
> > +               input_abs_set_res(ts->input, ABS_MT_TOUCH_MAJOR,
> > + ts->report_major_resolution);
> >
> >         touchscreen_parse_properties(ts->input, true, &ts->prop);
> >
> > --
> > 2.7.4
> >
> 
> Harry Cutts
> Chrome OS Touch/Input team

--
Johnny