linux-kernel - Re: [PATCH 1/3] auxdisplay: Make charlcd.[ch] more general

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Message-ID: <CANiq72=uXWpEWHixM+wwyxZfzQ41WYvQsoV8B3+JLRharDjC0w@mail.gmail.com>
Date:   Wed, 16 Oct 2019 18:53:20 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Lars Poeschel <poeschel@...onage.de>
Cc:     Willy Tarreau <willy@...roxy.com>,
        Ksenija Stanojevic <ksenija.stanojevic@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH 1/3] auxdisplay: Make charlcd.[ch] more general

On Wed, Oct 16, 2019 at 10:24 AM Lars Poeschel <poeschel@...onage.de> wrote:
>
> charlcd.c contains lots of hd44780 hardware specific stuff. It is nearly
> impossible to reuse the interface for other character based displays.
> The current users of charlcd are the hd44780 and the panel drivers.
> This does factor out the hd44780 specific stuff out of charlcd into a
> new module called hd44780_common.
> charlcd gets rid of the hd44780 specfics and more generally useable.
> The hd44780 and panel drivers are modified to use the new
> hd44780_common.
> This is tested on a hd44780 connected through the gpios of a pcf8574.
>
> Signed-off-by: Lars Poeschel <poeschel@...onage.de>
> ---
>  drivers/auxdisplay/Kconfig          |  16 +
>  drivers/auxdisplay/Makefile         |   1 +
>  drivers/auxdisplay/charlcd.c        | 591 ++++++++--------------------
>  drivers/auxdisplay/charlcd.h        | 109 ++++-
>  drivers/auxdisplay/hd44780.c        | 121 ++++--
>  drivers/auxdisplay/hd44780_common.c | 370 +++++++++++++++++
>  drivers/auxdisplay/hd44780_common.h |  32 ++
>  drivers/auxdisplay/panel.c          | 178 ++++-----
>  8 files changed, 851 insertions(+), 567 deletions(-)

Thanks Lars, CC'ing Geert since he wrote a large portion of this, as
well as Andy.

>From a cursory look (sorry, not doing it inline since it is a pain to
edit in this UI given the size...):
  * panel.c doesn't compile since lcd_backlight's return type did not
get updated, which makes me uneasy. I am not sure why you changed the
return type anyway, since callers ignore it and callees always return
0.
  * Declared and then immediately defined hd44780_common in the header...?
  * Some things (e.g. the addition of enums like charlcd_onoff) seem
like could have been done other patches (since they are not really
related to the reorganization).
  * From checkpatch.pl: DOS line endings and trailing whitespace

I am not capable of testing this, so extra testing by anyone who has
the different hardware affected around is very welcome.

Cheers,
Miguel