linux-kernel - Re: [PATCH] Input - elantech: force a resolution of 31 u/mm

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Date:	Tue, 14 Jul 2015 19:59:47 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	Peter Hutterer <peter.hutterer@...-t.net>
Cc:	"open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	Duson Lin <dusonlin@....com.tw>
Subject: Re: [PATCH] Input - elantech: force a resolution of 31 u/mm

Hi

On Fri, Jul 10, 2015 at 2:32 AM, Peter Hutterer
<peter.hutterer@...-t.net> wrote:
> All Elantech touchpads pre-v4 with dynamic resolution queries have a fixed
> resolution of 800dpi -> 31.49 units/mm. Set this statically, so userspace does
> not have to guess.
>
> Cc: Duson Lin <dusonlin@....com.tw>
> Signed-off-by: Peter Hutterer <peter.hutterer@...-t.net>
> ---
>  drivers/input/mouse/elantech.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)

I think this is much nicer than having to work around this in
user-space. Much appreciated!

Reviewed-by: David Herrmann <dh.herrmann@...il.com>

Thanks
David

> diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
> index ce3d400..22b9ca9 100644
> --- a/drivers/input/mouse/elantech.c
> +++ b/drivers/input/mouse/elantech.c
> @@ -1167,7 +1167,7 @@ static int elantech_set_input_params(struct psmouse *psmouse)
>         struct input_dev *dev = psmouse->dev;
>         struct elantech_data *etd = psmouse->private;
>         unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0;
> -       unsigned int x_res = 0, y_res = 0;
> +       unsigned int x_res = 31, y_res = 31;
>
>         if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width))
>                 return -1;
> @@ -1232,8 +1232,6 @@ static int elantech_set_input_params(struct psmouse *psmouse)
>                 /* For X to recognize me as touchpad. */
>                 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
>                 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
> -               input_abs_set_res(dev, ABS_X, x_res);
> -               input_abs_set_res(dev, ABS_Y, y_res);
>                 /*
>                  * range of pressure and width is the same as v2,
>                  * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
> @@ -1246,8 +1244,6 @@ static int elantech_set_input_params(struct psmouse *psmouse)
>                 input_mt_init_slots(dev, ETP_MAX_FINGERS, 0);
>                 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
>                 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
> -               input_abs_set_res(dev, ABS_MT_POSITION_X, x_res);
> -               input_abs_set_res(dev, ABS_MT_POSITION_Y, y_res);
>                 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
>                                      ETP_PMAX_V2, 0, 0);
>                 /*
> @@ -1259,6 +1255,13 @@ static int elantech_set_input_params(struct psmouse *psmouse)
>                 break;
>         }
>
> +       input_abs_set_res(dev, ABS_X, x_res);
> +       input_abs_set_res(dev, ABS_Y, y_res);
> +       if (etd->hw_version > 1) {
> +               input_abs_set_res(dev, ABS_MT_POSITION_X, x_res);
> +               input_abs_set_res(dev, ABS_MT_POSITION_Y, y_res);
> +       }
> +
>         etd->y_max = y_max;
>         etd->width = width;
>
> --
> 2.4.3
>
> --
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