[PATCH 00/25] Make charlcd device independent

From: poeschel
Date: Thu Oct 29 2020 - 06:01:01 EST


From: Lars Poeschel <poeschel@xxxxxxxxxxx>

This tries to make charlcd device independent. At the moment hd44780
device specific code is contained deep in charlcd. This moves this out
into a hd44780_common module, where the two hd44780 drivers we have at
the moment (hd44780 and panel) can use this from. The goal is that at
the end other drivers can use the charlcd interface.
I add one such driver for a modtronix lcd displau with the last patch.
I submitted this already some time ago, where the wish was so split
this into smaller chunks what I try to do with this patchset.

This is v5 of the patchset. I address a few review comments with this.
I fixed some typos, but more importantly Miguel spotted that I reverted
commit 3f03b6498 ("auxdisplay: charlcd: Reuse hex_to_bin() instead of
custom code") during rebasing. This is corrected now.

As a note to patch 23:
This might slightly change behaviour.
On hd44780 displays with one or two lines the previous implementation
did still write characters to the buffer of the display even if they are
currently not visible. The shift_display command could be used so set
the "viewing window" to a new position in the buffer and then you could
see the characters previously written.
This described behaviour does not work for hd44780 displays with more
than two display lines. There simply is not enough buffer.
So the behaviour was a bit inconsistens across different displays.
The new behaviour is to stop writing character at the end of a visible
line, even if there would be room in the buffer. This allows us to have
an easy implementation, that should behave equal on all supported
displays. This is not hd44780 hardware dependent anymore.

Link: https://lore.kernel.org/lkml/20191016082430.5955-1-poeschel@xxxxxxxxxxx/
Link: https://lore.kernel.org/lkml/CANiq72kS-u_Xd_m+2CQVh-JCncPf1XNXrXAZ=4z+mze8fwv2kw@xxxxxxxxxxxxxx/

Changes in v5:
- patch 1: Fix a commit message typo: of -> on
- patch 2: Remove some unnecessary newlines
- patch 8: Fix some typos
- patch 14: Fix commit message typo: it's -> its
- patch 15: this patch is squashed together from the former individual
hd44780_common_ function patches
- patch 16: combined two cleanup patches
- patch 17: I did previously undo commit 3f03b6498 which was a mistake.
This is now corrected.
- patch 24: Picked up Robs Reviewed-by
- patch 25: use hex_to_bin like in commit 3f03b6498 but for the lcd2s.c
file

Changes in v4:
- modtronix -> Modtronix in new lcd2s driver
- Kconfig: remove "default n" in new lcd2s driver

Changes in v3:
- Fix some typos in Kconfig stuff
- Fix kernel test robot reported error: Missed EXPORT_SYMBOL_GPL
- new patch to reduce display timeout
- better patch description to why not move cursor beyond end of a line
- Fixed make dt_binding_doc errors

Changes in v2:
- split whole patch into many smaller chunks
- device tree doc in yaml

Lars Poeschel (25):
auxdisplay: Use an enum for charlcd backlight on/off ops
auxdisplay: Introduce hd44780_common.[ch]
auxdisplay: Move hwidth and bwidth to struct hd44780_common
auxdisplay: Move ifwidth to struct hd44780_common
auxdisplay: Move write_data pointer to hd44780_common
auxdisplay: Move write_cmd pointers to hd44780 drivers
auxdisplay: Move addr out of charlcd_priv
auxdisplay: hd44780_common_print
auxdisplay: provide hd44780_common_gotoxy
auxdisplay: add home to charlcd_ops
auxdisplay: Move clear_display to hd44780_common
auxdisplay: make charlcd_backlight visible to hd44780_common
auxdisplay: Make use of enum for backlight on / off
auxdisplay: Move init_display to hd44780_common
auxdisplay: implement various hd44780_common_ functions
auxdisplay: cleanup unnecessary hd44780 code in charlcd
auxdisplay: Move char redefine code to hd44780_common
auxdisplay: Call charlcd_backlight in place
auxdisplay: hd44780_common: Reduce clear_display timeout
auxdisplay: hd44780: Remove clear_fast
auxdisplay: charlcd: replace last device specific stuff
auxdisplay: Change gotoxy calling interface
auxdisplay: charlcd: Do not print chars at end of line
auxdisplay: lcd2s DT binding doc
auxdisplay: add a driver for lcd2s character display

.../bindings/auxdisplay/modtronix,lcd2s.yaml | 58 +++
.../devicetree/bindings/vendor-prefixes.yaml | 2 +
drivers/auxdisplay/Kconfig | 30 ++
drivers/auxdisplay/Makefile | 2 +
drivers/auxdisplay/charlcd.c | 412 +++++-------------
drivers/auxdisplay/charlcd.h | 86 +++-
drivers/auxdisplay/hd44780.c | 120 +++--
drivers/auxdisplay/hd44780_common.c | 361 +++++++++++++++
drivers/auxdisplay/hd44780_common.h | 33 ++
drivers/auxdisplay/lcd2s.c | 403 +++++++++++++++++
drivers/auxdisplay/panel.c | 180 ++++----
11 files changed, 1237 insertions(+), 450 deletions(-)
create mode 100644 Documentation/devicetree/bindings/auxdisplay/modtronix,lcd2s.yaml
create mode 100644 drivers/auxdisplay/hd44780_common.c
create mode 100644 drivers/auxdisplay/hd44780_common.h
create mode 100644 drivers/auxdisplay/lcd2s.c

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2.28.0