# SPDX-License-Identifier: GPL-2.0
#
# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.rst.
#
# Auxiliary display drivers configuration.
#
menuconfig AUXDISPLAY
bool "Auxiliary Display support"
help
Say Y here to get to see options for auxiliary display drivers.
This option alone does not add any kernel code.
If you say N, all options in this submenu will be skipped and disabled.
if AUXDISPLAY
#
# Character LCD section
#
config CHARLCD
tristate "Character LCD core support" if COMPILE_TEST
help
This is the base system for character-based LCD displays.
It makes no sense to have this alone, you select your display driver
and if it needs the charlcd core, it will select it automatically.
This is some character LCD core interface that multiple drivers can
use.
config HD44780_COMMON
tristate "Common functions for HD44780 (and compatibles) LCD displays" if COMPILE_TEST
select CHARLCD
help
This is a module with the common symbols for HD44780 (and compatibles)
displays. This is the code that multiple other modules use. It is not
useful alone. If you have some sort of HD44780 compatible display,
you very likely use this. It is selected automatically by selecting
your concrete display.
config HD44780
tristate "HD44780 Character LCD support"
depends on GPIOLIB || COMPILE_TEST
select HD44780_COMMON
help
Enable support for Character LCDs using a HD44780 controller.
The LCD is accessible through the /dev/lcd char device (10, 156).
This code can either be compiled as a module, or linked into the
kernel and started at boot.
If you don't understand what all this is about, say N.
config LCD2S
tristate "lcd2s 20x4 character display over I2C console"
depends on I2C
select CHARLCD
help
This is a driver that lets you use the lcd2s 20x4 character display
from Modtronix engineering as a console output device. The display
is a simple single color character display. You have to connect it
to an I2C bus.
menuconfig PARPORT_PANEL
tristate "Parallel port LCD/Keypad Panel support"
depends on PARPORT
select HD44780_COMMON
help
Say Y here if you have an HD44780 or KS-0074 LCD connected to your
parallel port. This driver also features 4 and 6-key keypads. The LCD
is accessible through the /dev/lcd char device (10, 156), and the
keypad through /dev/keypad (10, 185). This code can either be
compiled as a module, or linked into the kernel and started at boot.
If you don't understand what all this is about, say N.
if PARPORT_PANEL
config PANEL_PARPORT
int "Default parallel port number (0=LPT1)"
range 0 255
default "0"
help
This is the index of the parallel port the panel is connected to. One
driver instance only supports one parallel port, so if your keypad
and LCD are connected to two separate ports, you have to start two
modules with different arguments. Numbering starts with '0' for LPT1,
and so on.
config PANEL_PROFILE
int "Default panel profile (0-5, 0=custom)"
range 0 5
default "5"
help
To ease configuration, the driver supports different configuration
profiles for past and recent wirings. These profiles can also be
used to define an approximative configuration, completed by a few
other options. Here are the profiles :
0 = custom (see further)
1 = 2x16 parallel LCD, old keypad
2 = 2x16 serial LCD (KS-0074), new keypad
3 = 2x16 parallel LCD (Hantronix), no keypad
4 = 2x16 parallel LCD (Nexcom NSA1045) with Nexcom's keypad
5 = 2x40 parallel LCD (old one), with old keypad
Custom configurations allow you to define how your display is
wired to the parallel port, and how it works. This is only intended
for experts.
config PANEL_KEYPAD
depends on PANEL_PROFILE="0"
int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)"
range 0 3
default 0
help
This enables and configures a keypad connected to the parallel port.
The keys will be read from character device 10,185. Valid values are :
0 : do not enable this driver
1 : old 6 keys keypad
2 : new 6 keys keypad, as used on the server at www.ant-computing.com
3 : Nexcom NSA1045's 4 keys keypad
New profiles can be described in the driver source. The driver also
supports simultaneous keys pressed when the keypad supports them.
config PANEL_LCD
depends on PANEL_PROFILE="0"
int "LCD type (0=none, 1=custom, 2=old //, 3=ks0074, 4=hantronix, 5=Nexcom)"
range 0 5
default 0
help
This enables and configures an LCD connected to the parallel port.
The driver includes an interpreter for escape codes starting with
'\e[L' which are specific to the LCD, and a few ANSI codes. The
driver will be registered as character device 10,156, usually
under the name '/dev/lcd'. There are a total of 6 supported types :
0 : do not enable the driver
1 : custom configuration and wiring (see further)
2 : 2x16 & 2x40 parallel LCD (old wiring)
3 : 2x16 serial LCD (KS-0074 based)
4 : 2x16 parallel LCD (Hantronix wiring)
5 : 2x16 parallel LCD (Nexcom wiring)
When type '1' is specified, other options will appear to configure
more precise aspects (wiring, dimensions, protocol, ...). Please note
that those values changed from the 2.4 driver for better consistency.
config PANEL_LCD_HEIGHT
depends on PANEL_PROFILE="0" && PANEL_LCD="1"
int "Number of lines on the LCD (1-2)"
range 1 2
default 2
help
This is the number of visible character lines on the LCD in custom profile.
It can either be 1 or 2.
config PANEL_LCD_WIDTH
depends on PANEL_PROFILE="0" && PANEL_LCD="1"
int "Number of characters per line on the LCD (1-40)"
range 1 40
default 40
help
This is the number of characters per line on the LCD in custom profile.
Common values are 16,20,24,40.
config PANEL_LCD_BWIDTH
depends on PANEL_PROFILE="0" && PANEL_LCD="1"
int "Internal LCD line width (1-40, 40 by default)"
range 1 40
default 40
help
Most LCDs use a standard controller which supports hardware lines of 40
characters, although sometimes only 16, 20 or 24 of them are really wired
to the terminal. This results in some non-visible but addressable characters,
and is the case for most parallel LCDs. Other LCDs, and some serial ones,
however, use the same line width internally as what is visible. The KS0074
for example, uses 16 characters per line for 16 visible characters per line.
This option lets you configure the value used by your LCD in 'custom' profile.
If you don't know, put '40' here.
config PANEL_LCD_HWIDTH
depends on PANEL_PROFILE="0" && PANEL_LCD="1"
int "Hardware LCD line width (1-64, 64 by default)"
range 1 64
default 64
help
Most LCDs use a single address bit to differentiate line 0 and line 1. Since
some of them need to be able to address 40 chars with the lower bits, they
often use the immediately superior power of 2, which is 64, to address the
next line.
If you don't know what your LCD uses, in doubt let 16 here for a 2x16, and
64 here for a 2x40.
config PANEL_LCD_CHARSET
depends on PANEL_PROFILE="0" && PANEL_LCD="1"
int "LCD character set (0=normal, 1=KS0074)"
range 0 1
default 0
help
Some controllers such as the KS0074 use a somewhat strange character set
where many symbols are at unusual places. The driver knows how to map
'standard' ASCII characters to the character sets used by these controllers.
Valid values are :
0 : normal (untranslated) character set
1 : KS0074 character set
If you don't know, use the normal one (0).
config PANEL_LCD_PROTO
depends on PANEL_PROFILE="0" && PANEL_LCD="1"
int "LCD communication mode (0=parallel 8 bits, 1=serial)"
range 0 1
default 0
help
This driver now supports any serial or parallel LCD wired to a parallel
port. But before assigning signals, the driver needs to know if it will
be driving a serial LCD or a parallel one. Serial LCDs only use 2 wires
(SDA/SCL), while parallel ones use 2 or 3 wires for the control signals
(E, RS, sometimes RW), and 4 or 8 for the data. Use 0 here for a 8 bits
parallel LCD, and 1 for a serial LCD.
config PANEL_LCD_PIN_E
depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
int "Parallel port pin number & polarity connected to the LCD E signal (-17...17) "
range -17 17
default 14
help
This describes the number of the parallel port pin to which the LCD 'E'
signal has been connected. It can be :
0 : no connection (eg: connected to ground)
1..17 : directly connected to any of these pins on the DB25 plug
-1..-17 : connected to the same pin through an inverter (eg: transistor).
Default for the 'E' pin in custom profile is '14' (AUTOFEED).
config PANEL_LCD_PIN_RS
depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
int "Parallel port pin number & polarity connected to the LCD RS signal (-17...17) "
range -17 17
default 17
help
This describes the number of the parallel port pin to which the LCD 'RS'
signal has been connected. It can be :
0 : no connection (eg: connected to ground)
1..17 : directly connected to any of these pins on the DB25 plug
-1..-17 : connected to the same pin through an inverter (eg: transistor).
Default for the 'RS' pin in custom profile is '17' (SELECT IN).
config PANEL_LCD_PIN_RW
depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
int "Parallel port pin number & polarity connected to the LCD RW signal (-17...17) "
range -17 17
default 16
help
This describes the number of the parallel port pin to which the LCD 'RW'
signal has been connected. It can be :
0 : no connection (eg: connected to ground)
1..17 : directly connected to any of these pins on the DB25 plug
-1..-17 : connected to the same pin through an inverter (eg: transistor).
Default for the 'RW' pin in custom profile is '16' (INIT).
config PANEL_LCD_PIN_SCL
depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
int "Parallel port pin number & polarity connected to the LCD SCL signal (-17...17) "
range -17 17
default 1
help
This describes the number of the parallel port pin to which the serial
LCD 'SCL' signal has been connected. It can be :
0 : no connection (eg: connected to ground)
1..17 : directly connected to any of these pins on the DB25 plug
-1..-17 : connected to the same pin through an inverter (eg: transistor).
Default for the 'SCL' pin in custom profile is '1' (STROBE).
config PANEL_LCD_PIN_SDA
depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
int "Parallel port pin number & polarity connected to the LCD SDA signal (-17...17) "
range -17 17
default 2
help
This describes the number of the parallel port pin to which the serial
LCD 'SDA' signal has been connected. It can be :
0 : no connection (eg: connected to ground)
1..17 : directly connected to any of these pins on the DB25 plug
-1..-17 : connected to the same pin through an inverter (eg: transistor).
Default for the 'SDA' pin in custom profile is '2' (D0).
config PANEL_LCD_PIN_BL
depends on PANEL_PROFILE="0" && PANEL_LCD="1"
int "Parallel port pin number & polarity connected to the LCD backlight signal (-17...17) "
range -17 17
default 0
help
This describes the number of the parallel port pin to which the LCD 'BL' signal
has been connected. It can be :
0 : no connection (eg: connected to ground)
1..17 : directly connected to any of these pins on the DB25 plug
-1..-17 : connected to the same pin through an inverter (eg: transistor).
Default for the 'BL' pin in custom profile is '0' (uncontrolled).
endif # PARPORT_PANEL
config PANEL_CHANGE_MESSAGE
bool "Change LCD initialization message ?"
depends on CHARLCD || LINEDISP
help
This allows you to replace the boot message indicating the kernel version
and the driver version with a custom message. This is useful on appliances
where a simple 'Starting system' message can be enough to stop a customer
from worrying.
If you say 'Y' here, you'll be able to choose a message yourself. Otherwise,
say 'N' and keep the default message with the version.
config PANEL_BOOT_MESSAGE
depends on PANEL_CHANGE_MESSAGE="y"
string "New initialization message"
default ""
help
This allows you to replace the boot message indicating the kernel version
and the driver version with a custom message. This is useful on appliances
where a simple 'Starting system' message can be enough to stop a customer
from worrying.
An empty message will only clear the display at driver init time. Any other
printf()-formatted message is valid with newline and escape codes.
choice
prompt "Backlight initial state"
default CHARLCD_BL_FLASH
help
Select the initial backlight state on boot or module load.
Previously, there was no option for this: the backlight flashed
briefly on init. Now you can also turn it off/on.
config CHARLCD_BL_OFF
bool "Off"
help
Backlight is initially turned off
config CHARLCD_BL_ON
bool "On"
help
Backlight is initially turned on
config CHARLCD_BL_FLASH
bool "Flash"
help
Backlight is flashed briefly on init
endchoice
#
# Samsung KS0108 LCD controller section
#
config KS0108
tristate "KS0108 LCD Controller"
depends on PARPORT_PC
help
If you have a LCD controlled by one or more KS0108
controllers, say Y. You will need also another more specific
driver for your LCD.
Depends on Parallel Port support. If you say Y at
parport, you will be able to compile this as a module (M)
and built-in as well (Y).
To compile this as a module, choose M here:
the module will be called ks0108.
If unsure, say N.
config KS0108_PORT
hex "Parallel port where the LCD is connected"
depends on KS0108
default 0x378
help
The address of the parallel port where the LCD is connected.
The first standard parallel port address is 0x378.
The second standard parallel port address is 0x278.
The third standard parallel port address is 0x3BC.
You can specify a different address if you need.
If you don't know what I'm talking about, load the parport module,
and execute "dmesg" or "cat /proc/ioports". You can see there how
many parallel ports are present and which address each one has.
Usually you only need to use 0x378.
If you compile this as a module, you can still override this
using the module parameters.
config KS0108_DELAY
int "Delay between each control writing (microseconds)"
depends on KS0108
default "2"
help
Amount of time the ks0108 should wait between each control write
to the parallel port.
If your LCD seems to miss random writings, increment this.
If you don't know what I'm talking about, ignore it.
If you compile this as a module, you can still override this
value using the module parameters.
config CFAG12864B
tristate "CFAG12864B LCD"
depends on X86
depends on FB
depends on KS0108
select FB_SYSMEM_HELPERS
help
If you have a Crystalfontz 128x64 2-color LCD, cfag12864b Series,
say Y. You also need the ks0108 LCD Controller driver.
For help about how to wire your LCD to the parallel port,
check Documentation/admin-guide/auxdisplay/cfag12864b.rst
Depends on the x86 arch and the framebuffer support.
The LCD framebuffer driver can be attached to a console.
It will work fine. However, you can't attach it to the fbdev driver
of the xorg server.
To compile this as a module, choose M here:
the modules will be called cfag12864b and cfag12864bfb.
If unsure, say N.
config CFAG12864B_RATE
int "Refresh rate (hertz)"
depends on CFAG12864B
default "20"
help
Refresh rate of the LCD.
As the LCD is not memory mapped, the driver has to make the work by
software. This means you should be careful setting this value higher.
If your CPUs are really slow or you feel the system is slowed down,
decrease the value.
Be careful modifying this value to a very high value:
You can freeze the computer, or the LCD maybe can't draw as fast as you
are requesting.
If you don't know what I'm talking about, ignore it.
If you compile this as a module, you can still override this
value using the module parameters.
#
# Single character line display section
#
config LINEDISP
tristate "Character line display core support" if COMPILE_TEST
help
This is the core support for single-line character displays, to be
selected by drivers that use it.
config IMG_ASCII_LCD
tristate "Imagination Technologies ASCII LCD Display"
depends on HAS_IOMEM
default y if MIPS_MALTA
select MFD_SYSCON
select LINEDISP
help
Enable this to support the simple ASCII LCD displays found on
development boards such as the MIPS Boston, MIPS Malta & MIPS SEAD3
from Imagination Technologies.
config HT16K33
tristate "Holtek Ht16K33 LED controller with keyscan"
depends on FB && I2C && INPUT
select FB_SYSMEM_HELPERS
select INPUT_MATRIXKMAP
select FB_BACKLIGHT
select NEW_LEDS
select LEDS_CLASS
select LINEDISP
help
Say yes here to add support for Holtek HT16K33, RAM mapping 16*8
LED controller driver with keyscan.
config MAX6959
tristate "Maxim MAX6958/6959 7-segment LED controller"
depends on I2C
select REGMAP_I2C
select LINEDISP
help
If you say yes here you get support for the following Maxim chips
(I2C 7-segment LED display controller):
- MAX6958
- MAX6959 (input support)
This driver can also be built as a module. If so, the module
will be called max6959.
config SEG_LED_GPIO
tristate "Generic 7-segment LED display"
depends on GPIOLIB || COMPILE_TEST
select LINEDISP
help
This driver supports a generic 7-segment LED display made up
of GPIO pins connected to the individual segments.
This driver can also be built as a module. If so, the module
will be called seg-led-gpio.
#
# Character LCD with non-conforming interface section
#
config ARM_CHARLCD
bool "ARM Ltd. Character LCD Driver"
depends on PLAT_VERSATILE
help
This is a driver for the character LCD found on the ARM Ltd.
Versatile and RealView Platform Baseboards. It doesn't do
very much more than display the text "ARM Linux" on the first
line and the Linux version on the second line, but that's
still useful.
endif # AUXDISPLAY
#
# Deprecated options
#
config PANEL
tristate "Parallel port LCD/Keypad Panel support (OLD OPTION)"
depends on PARPORT
select AUXDISPLAY
select PARPORT_PANEL
Codebase Browser
linux