linux-kernel - Re: [PATCH 03/12] Input: synaptics - fix minimum reported ABS_TOOL

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Date:	Wed, 29 Jun 2011 08:28:26 -0500
From:	Chris Bagwell <chris@...bagwell.com>
To:	djkurtz@...omium.org
Cc:	dmitry.torokhov@...il.com, rydberg@...omail.se,
	chase.douglas@...onical.com, rubini@...l.unipv.it,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	derek.foreman@...labora.co.uk, daniel.stone@...labora.co.uk,
	olofj@...omium.org
Subject: Re: [PATCH 03/12] Input: synaptics - fix minimum reported ABS_TOOL_WIDTH

On Wed, Jun 29, 2011 at 12:07 AM,  <djkurtz@...omium.org> wrote:
> From: Daniel Kurtz <djkurtz@...omium.org>
>
> Synaptics touchpads report a 'w' value in each data report.
> For touchpads that support palm detection, when there is a single finger
> on the pad, the 'w' value reports its width in the range 4 to 15.
> Thus, the minimum valid width is 4.

FYI: I had debated on this as well.  When driver was first modified to
report min/max width, the min width of zero was chosen because when
not touching the pad a value of zero is forced by driver to user.  So
the range is 0, 4-15.

>
> Note: Other values of 'w' are used to report special conditions:
>  w=0: 2 fingers are on the pad
>  w=1: 3 or more fingers are on the pad
>  w=2: the packet contains "Advanced Gesture Mode" data.
>
> Signed-off-by: Daniel Kurtz <djkurtz@...omium.org>
> ---
>  drivers/input/mouse/synaptics.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
> index f6d0c04..a4b7801 100644
> --- a/drivers/input/mouse/synaptics.c
> +++ b/drivers/input/mouse/synaptics.c
> @@ -706,7 +706,7 @@ static void set_input_params(struct input_dev *dev, struct synaptics_data *priv)
>        }
>
>        if (SYN_CAP_PALMDETECT(priv->capabilities))
> -               input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0);
> +               input_set_abs_params(dev, ABS_TOOL_WIDTH, 4, 15, 0, 0);
>
>        __set_bit(EV_KEY, dev->evbit);
>        __set_bit(BTN_TOUCH, dev->keybit);
> --
> 1.7.3.1
>
> --
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