linux-stable.git/drivers/auxdisplay, branch v5.16.2

auxdisplay: charlcd: checking for pointer reference before dereferencing

2021-11-24T10:46:52+00:00

Check if the pointer lcd->ops->init_display exists before dereferencing it.
If a driver called charlcd_init() without defining the ops, this would
return segmentation fault, as happened to me when implementing a charlcd
driver.  Checking the pointer before dereferencing protects from
segmentation fault.

Signed-off-by: Luiz Sampaio 
Signed-off-by: Miguel Ojeda

auxdisplay: charlcd: fixing coding style issue

2021-11-24T10:46:42+00:00

Removing 'int' from 'unsigned long int' declaration, which is unnecessary.

Signed-off-by: Luiz Sampaio 
Signed-off-by: Miguel Ojeda

auxdisplay: cfag12864bfb: code indent should use tabs where possible

2021-10-21T22:13:16+00:00

Resolves the checkpatch error.

Signed-off-by: Huiquan Deng 
[reworded and avoid moving the line]
Signed-off-by: Miguel Ojeda

auxdisplay: ht16k33: remove superfluous header files

2021-10-21T22:07:29+00:00

ht16k33.c doesn't use any macro or function declared in
linux/slab.h. Thus, these files can be removed from ht16k33.c
safely without affecting the compilation.

Signed-off-by: Mianhan Liu 
Acked-by: Robin van der Gracht 
[reworded]
Signed-off-by: Miguel Ojeda

auxdisplay: ks0108: remove superfluous header files

2021-10-21T22:04:43+00:00

ks0108.c doesn't use any macro or function declared in
linux/fs.h, linux/io.h and linux/uaccess.h. Thus,
these files can be removed from ks0108.c safely without
affecting the compilation.

Signed-off-by: Mianhan Liu 
[reworded]
Signed-off-by: Miguel Ojeda

auxdisplay: cfag12864bfb: remove superfluous header files

2021-10-21T22:03:49+00:00

cfag12864bfb.c doesn't use any macro or function declared in
linux/delay.h, linux/string.h and linux/uaccess.h. Thus,
these files can be removed from cfag12864bfb.c safely without
affecting the compilation.

Signed-off-by: Mianhan Liu 
[reworded]
Signed-off-by: Miguel Ojeda

auxdisplay: ht16k33: Make use of device properties

2021-10-21T21:36:30+00:00

The device property API allows drivers to gather device resources from
different sources, such as ACPI, and lift the dependency on Device Tree.
Convert the driver to unleash the power of the device property API.

Suggested-by: Marek Behún 
Signed-off-by: Geert Uytterhoeven 
Reviewed-by: Andy Shevchenko 
Acked-by: Robin van der Gracht 
Signed-off-by: Miguel Ojeda

auxdisplay: ht16k33: Add LED support

2021-10-21T21:36:30+00:00

Instantiate a single LED based on the "led" subnode in DT.
This allows the user to control display brightness and blinking (backed
by hardware support) through the LED class API and triggers, and exposes
the display color.  The LED will be named
"auxdisplay::".

When running in dot-matrix mode and if no "led" subnode is found, the
driver falls back to the traditional backlight mode, to preserve
backwards compatibility.

Signed-off-by: Geert Uytterhoeven 
Reviewed-by: Marek Behún 
Reviewed-by: Robin van der Gracht 
Signed-off-by: Miguel Ojeda

auxdisplay: ht16k33: Add support for segment displays

2021-10-21T21:36:30+00:00

The Holtek HT16K33 LED controller is not only used for driving
dot-matrix displays, but also for driving segment displays.

Add support for 4-digit 7-segment and quad 14-segment alphanumeric
displays, like the Adafruit 7-segment and 14-segment display backpack
and FeatherWing expansion boards.  Use the character line display core
support to display a message, which will be scrolled if it doesn't fit.

Signed-off-by: Geert Uytterhoeven 
Acked-by: Robin van der Gracht 
Signed-off-by: Miguel Ojeda

auxdisplay: ht16k33: Extract frame buffer probing

2021-10-21T21:36:30+00:00

Extract all frame buffer (including backlight) probing into
ht16k33_fbdev_probe().

Call ht16k33_fbdev_probe() after ht16k33_keypad_probe(), as the latter
does not need any manual cleanup in the probe error path.

Signed-off-by: Geert Uytterhoeven 
Reviewed-by: Robin van der Gracht 
Signed-off-by: Miguel Ojeda