drivers/auxdisplay/Kconfig - linux - Git at Google

 # 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
	# 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