linux-kernel - Re: [PATCH v5 2/2] Input: cros-ec-keyb - Expose function row physical map to userspace

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Date:   Thu, 14 Jan 2021 18:32:31 -0800
From:   Philip Chen <philipchen@...omium.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Douglas Anderson <dianders@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>,
        Lee Jones <lee.jones@...aro.org>,
        Rajat Jain <rajatja@...gle.com>, linux-input@...r.kernel.org
Subject: Re: [PATCH v5 2/2] Input: cros-ec-keyb - Expose function row physical
 map to userspace

On Wed, Jan 13, 2021 at 5:36 PM Stephen Boyd <swboyd@...omium.org> wrote:
>
> Quoting Philip Chen (2021-01-13 17:25:13)
> > diff --git a/drivers/input/keyboard/cros_ec_keyb.c b/drivers/input/keyboard/cros_ec_keyb.c
> > index b379ed7628781..273e3c9ba0b03 100644
> > --- a/drivers/input/keyboard/cros_ec_keyb.c
> > +++ b/drivers/input/keyboard/cros_ec_keyb.c
> > @@ -578,6 +590,19 @@ static int cros_ec_keyb_register_matrix(struct cros_ec_keyb *ckdev)
> >         ckdev->idev = idev;
> >         cros_ec_keyb_compute_valid_keys(ckdev);
> >
> > +       of_property_for_each_u32(dev->of_node, "function-row-physmap",
> > +                                prop, p, key_pos) {
> > +               if (i >= MAX_NUM_TOP_ROW_KEYS) {
> > +                       dev_err(dev, "Only support up to %d top row keys.\n",
>
> dev_warn? And drop the period please as we don't add them in the kernel
> usually.
Done.
>
> > +                               MAX_NUM_TOP_ROW_KEYS);
> > +                       break;
> > +               }
> > +               ckdev->function_row_physmap[i] = MATRIX_SCAN_CODE(
>
> Maybe grow some more local variables, like for function_row_physmap so
> this can fit on one line?
Done. Please take a look at v6.
>
>                 row = KEY_ROW(key_pos);
>                 col = KEY_COL(key_pos);
>                 map[i] = MATRIX_SCAN_CODE(row, col, ckdev->row_shift);
>
> > +                       KEY_ROW(key_pos), KEY_COL(key_pos), ckdev->row_shift);
> > +               i++;
>
> We could remove this and just increment num_function_row_keys instead.
> Then that condition check may be a little longer but probably still ok.
Done. Please take a look at v6.
>
>
> > +       }
> > +       ckdev->num_function_row_keys = i;
> > +
> >         err = input_register_device(ckdev->idev);
> >         if (err) {
> >                 dev_err(dev, "cannot register input device\n");