# 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 [31mCONFIG_AUXDISPLAY[0m
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 [31mCONFIG_AUXDISPLAY[0m
config [31mCONFIG_HD44780[0m
tristate "HD44780 Character LCD support"
depends on [31mCONFIG_GPIOLIB[0m || [31mCONFIG_COMPILE_TEST[0m
select [31mCONFIG_CHARLCD[0m
---help---
Enable support for Character LCDs using a [31mCONFIG_HD44780[0m 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 [31mCONFIG_KS0108[0m
tristate "KS0108 LCD Controller"
depends on [31mCONFIG_PARPORT_PC[0m
default n
---help---
If you have a LCD controlled by one or more [31mCONFIG_KS0108[0m
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 ([31mCONFIG_M[0m)
and built-in as well (Y).
To compile this as a module, choose [31mCONFIG_M[0m here:
the module will be called ks0108.
If unsure, say N.
config [31mCONFIG_KS0108_PORT[0m
hex "Parallel port where the LCD is connected"
depends on [31mCONFIG_KS0108[0m
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 [31mCONFIG_KS0108_DELAY[0m
int "Delay between each control writing (microseconds)"
depends on [31mCONFIG_KS0108[0m
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 [31mCONFIG_CFAG12864B[0m
tristate "CFAG12864B LCD"
depends on [31mCONFIG_X86[0m
depends on [31mCONFIG_FB[0m
depends on [31mCONFIG_KS0108[0m
select [31mCONFIG_FB_SYS_FILLRECT[0m
select [31mCONFIG_FB_SYS_COPYAREA[0m
select [31mCONFIG_FB_SYS_IMAGEBLIT[0m
select [31mCONFIG_FB_SYS_FOPS[0m
default n
---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 [31mCONFIG_M[0m here:
the modules will be called cfag12864b and cfag12864bfb.
If unsure, say N.
config [31mCONFIG_CFAG12864B_RATE[0m
int "Refresh rate (hertz)"
depends on [31mCONFIG_CFAG12864B[0m
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.
config [31mCONFIG_IMG_ASCII_LCD[0m
tristate "Imagination Technologies ASCII LCD Display"
depends on [31mCONFIG_HAS_IOMEM[0m
default y if [31mCONFIG_MIPS_MALTA[0m
select [31mCONFIG_MFD_SYSCON[0m
help
Enable this to support the simple ASCII LCD displays found on
development boards such as the [31mCONFIG_MIPS[0m Boston, [31mCONFIG_MIPS[0m Malta & [31mCONFIG_MIPS[0m SEAD3
from Imagination Technologies.
config [31mCONFIG_HT16K33[0m
tristate "Holtek Ht16K33 LED controller with keyscan"
depends on [31mCONFIG_FB[0m && [31mCONFIG_OF[0m && [31mCONFIG_I2C[0m && [31mCONFIG_INPUT[0m
select [31mCONFIG_FB_SYS_FOPS[0m
select [31mCONFIG_FB_SYS_FILLRECT[0m
select [31mCONFIG_FB_SYS_COPYAREA[0m
select [31mCONFIG_FB_SYS_IMAGEBLIT[0m
select [31mCONFIG_INPUT_MATRIXKMAP[0m
select [31mCONFIG_FB_BACKLIGHT[0m
help
Say yes here to add support for Holtek [31mCONFIG_HT16K33[0m, RAM mapping 16*8
LED controller driver with keyscan.
config [31mCONFIG_ARM_CHARLCD[0m
bool "ARM Ltd. Character LCD Driver"
depends on [31mCONFIG_PLAT_VERSATILE[0m
help
This is a driver for the character LCD found on the [31mCONFIG_ARM[0m 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.
menuconfig [31mCONFIG_PARPORT_PANEL[0m
tristate "Parallel port LCD/Keypad Panel support"
depends on [31mCONFIG_PARPORT[0m
select [31mCONFIG_CHARLCD[0m
---help---
Say Y here if you have an [31mCONFIG_HD44780[0m 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 [31mCONFIG_PARPORT_PANEL[0m
config [31mCONFIG_PANEL_PARPORT[0m
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 [31mCONFIG_PANEL_PROFILE[0m
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 [31mCONFIG_PANEL_KEYPAD[0m
depends on [31mCONFIG_PANEL_PROFILE[0m="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 [31mCONFIG_PANEL_LCD[0m
depends on [31mCONFIG_PANEL_PROFILE[0m="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 [31mCONFIG_PANEL_LCD_HEIGHT[0m
depends on [31mCONFIG_PANEL_PROFILE[0m="0" && [31mCONFIG_PANEL_LCD[0m="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 [31mCONFIG_PANEL_LCD_WIDTH[0m
depends on [31mCONFIG_PANEL_PROFILE[0m="0" && [31mCONFIG_PANEL_LCD[0m="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 [31mCONFIG_PANEL_LCD_BWIDTH[0m
depends on [31mCONFIG_PANEL_PROFILE[0m="0" && [31mCONFIG_PANEL_LCD[0m="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 [31mCONFIG_PANEL_LCD_HWIDTH[0m
depends on [31mCONFIG_PANEL_PROFILE[0m="0" && [31mCONFIG_PANEL_LCD[0m="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 [31mCONFIG_PANEL_LCD_CHARSET[0m
depends on [31mCONFIG_PANEL_PROFILE[0m="0" && [31mCONFIG_PANEL_LCD[0m="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 [31mCONFIG_PANEL_LCD_PROTO[0m
depends on [31mCONFIG_PANEL_PROFILE[0m="0" && [31mCONFIG_PANEL_LCD[0m="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
([31mCONFIG_E[0m, 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 [31mCONFIG_PANEL_LCD_PIN_E[0m
depends on [31mCONFIG_PANEL_PROFILE[0m="0" && [31mCONFIG_PANEL_LCD[0m="1" && [31mCONFIG_PANEL_LCD_PROTO[0m="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 '[31mCONFIG_E[0m'
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 '[31mCONFIG_E[0m' pin in custom profile is '14' (AUTOFEED).
config [31mCONFIG_PANEL_LCD_PIN_RS[0m
depends on [31mCONFIG_PANEL_PROFILE[0m="0" && [31mCONFIG_PANEL_LCD[0m="1" && [31mCONFIG_PANEL_LCD_PROTO[0m="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 [31mCONFIG_PANEL_LCD_PIN_RW[0m
depends on [31mCONFIG_PANEL_PROFILE[0m="0" && [31mCONFIG_PANEL_LCD[0m="1" && [31mCONFIG_PANEL_LCD_PROTO[0m="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 [31mCONFIG_PANEL_LCD_PIN_SCL[0m
depends on [31mCONFIG_PANEL_PROFILE[0m="0" && [31mCONFIG_PANEL_LCD[0m="1" && [31mCONFIG_PANEL_LCD_PROTO[0m!="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 [31mCONFIG_PANEL_LCD_PIN_SDA[0m
depends on [31mCONFIG_PANEL_PROFILE[0m="0" && [31mCONFIG_PANEL_LCD[0m="1" && [31mCONFIG_PANEL_LCD_PROTO[0m!="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 [31mCONFIG_PANEL_LCD_PIN_BL[0m
depends on [31mCONFIG_PANEL_PROFILE[0m="0" && [31mCONFIG_PANEL_LCD[0m="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 # [31mCONFIG_PARPORT_PANEL[0m
config [31mCONFIG_PANEL_CHANGE_MESSAGE[0m
bool "Change LCD initialization message ?"
depends on [31mCONFIG_CHARLCD[0m
default "n"
---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 [31mCONFIG_PANEL_BOOT_MESSAGE[0m
depends on [31mCONFIG_PANEL_CHANGE_MESSAGE[0m="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 [31mCONFIG_CHARLCD_BL_FLASH[0m
---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 [31mCONFIG_CHARLCD_BL_OFF[0m
bool "Off"
help
Backlight is initially turned off
config [31mCONFIG_CHARLCD_BL_ON[0m
bool "On"
help
Backlight is initially turned on
config [31mCONFIG_CHARLCD_BL_FLASH[0m
bool "Flash"
help
Backlight is flashed briefly on init
endchoice
endif # [31mCONFIG_AUXDISPLAY[0m
config [31mCONFIG_PANEL[0m
tristate "Parallel port LCD/Keypad Panel support (OLD OPTION)"
depends on [31mCONFIG_PARPORT[0m
select [31mCONFIG_AUXDISPLAY[0m
select [31mCONFIG_PARPORT_PANEL[0m
config [31mCONFIG_CHARLCD[0m
tristate "Character LCD core support" if [31mCONFIG_COMPILE_TEST[0m