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SubjectRe: [PATCH 1/3] auxdisplay: Make charlcd.[ch] more general
On Wed, Oct 16, 2019 at 10:24 AM Lars Poeschel <> 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 <>
> ---
> 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
* 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 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.


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