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