linux-kernel - Re: [Letux-kernel] [PATCH v3 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation

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Date:   Fri, 30 Sep 2016 18:23:14 +0200
From:   Christ van Willegen <cvwillegen@...il.com>
To:     Discussions about the Letux Kernel <letux-kernel@...nphoenux.org>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Michael Welling <mwelling@...e.org>,
        Mika Penttilä <mika.penttila@...tfour.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Igor Grinberg <grinberg@...pulab.co.il>,
        Sebastian Reichel <sre@...nel.org>,
        "Andrew F. Davis" <afd@...com>, devicetree@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [Letux-kernel] [PATCH v3 1/8] drivers:input:tsc2007: add new
 common binding names, pre-calibration, flipping and rotation

Hi,

I saw this earlier, but didn't think it important to mention, but:


On Fri, Sep 23, 2016 at 2:41 PM, H. Nikolaus Schaller <hns@...delico.com> wrote:

> diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c
> index 5d0cd51..9a11509 100644
> --- a/drivers/input/touchscreen/tsc2007.c
> +++ b/drivers/input/touchscreen/tsc2007.c

> +                       /* scale ADC values to desired output range */
> +                       sx = (ts->prop.max_x * (tc.x - ts->min_x))
> +                               / (ts->max_x - ts->min_x);
> +                       sy = (ts->prop.max_y * (tc.y - ts->min_y))
> +                               / (ts->max_y - ts->min_y);
> +                       rt = (input->absinfo[ABS_PRESSURE].maximum * rt) /
> +                               ts->max_rt;

If ts->max_rt is zero, or ts->max_x == ts->min_x, or ts->max_y ==
ts->min_y, these yield a division by zero error.

Ofcourse, this is under control of the DT-maintainer(s) of the device
(if I'm not mistaking), but throwing an error on DT parse if (one of)
these condition(s) is met yields better info to the DT-maintainer than
a /0 error...

If you (or others) agree, could you add this to the patch?

Regards,

Christ van Willegen