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

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Message-ID: <CA+jURctrQcKsGwxZriX8bD3AQr-yh_J_Z7kkP+6HtD72Gt5DUw@mail.gmail.com>
Date:   Thu, 27 Aug 2020 10:56:20 -0700
From:   Harry Cutts <hcutts@...omium.org>
To:     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>,
        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 - 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.

>
> 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