1 # SPDX-License-Identifier: GPL-2.0
3 # For a description of the syntax of this configuration file,
4 # see Documentation/kbuild/kconfig-language.rst.
6 # Auxiliary display drivers configuration.
10 bool "Auxiliary Display support"
12 Say Y here to get to see options for auxiliary display drivers.
13 This option alone does not add any kernel code.
15 If you say N, all options in this submenu will be skipped and disabled.
20 # Character LCD section
23 tristate "Character LCD core support" if COMPILE_TEST
25 This is the base system for character-based LCD displays.
26 It makes no sense to have this alone, you select your display driver
27 and if it needs the charlcd core, it will select it automatically.
28 This is some character LCD core interface that multiple drivers can
32 tristate "Common functions for HD44780 (and compatibles) LCD displays" if COMPILE_TEST
35 This is a module with the common symbols for HD44780 (and compatibles)
36 displays. This is the code that multiple other modules use. It is not
37 useful alone. If you have some sort of HD44780 compatible display,
38 you very likely use this. It is selected automatically by selecting
39 your concrete display.
42 tristate "HD44780 Character LCD support"
43 depends on GPIOLIB || COMPILE_TEST
46 Enable support for Character LCDs using a HD44780 controller.
47 The LCD is accessible through the /dev/lcd char device (10, 156).
48 This code can either be compiled as a module, or linked into the
49 kernel and started at boot.
50 If you don't understand what all this is about, say N.
53 tristate "lcd2s 20x4 character display over I2C console"
57 This is a driver that lets you use the lcd2s 20x4 character display
58 from Modtronix engineering as a console output device. The display
59 is a simple single color character display. You have to connect it
62 menuconfig PARPORT_PANEL
63 tristate "Parallel port LCD/Keypad Panel support"
67 Say Y here if you have an HD44780 or KS-0074 LCD connected to your
68 parallel port. This driver also features 4 and 6-key keypads. The LCD
69 is accessible through the /dev/lcd char device (10, 156), and the
70 keypad through /dev/keypad (10, 185). This code can either be
71 compiled as a module, or linked into the kernel and started at boot.
72 If you don't understand what all this is about, say N.
77 int "Default parallel port number (0=LPT1)"
81 This is the index of the parallel port the panel is connected to. One
82 driver instance only supports one parallel port, so if your keypad
83 and LCD are connected to two separate ports, you have to start two
84 modules with different arguments. Numbering starts with '0' for LPT1,
88 int "Default panel profile (0-5, 0=custom)"
92 To ease configuration, the driver supports different configuration
93 profiles for past and recent wirings. These profiles can also be
94 used to define an approximative configuration, completed by a few
95 other options. Here are the profiles :
97 0 = custom (see further)
98 1 = 2x16 parallel LCD, old keypad
99 2 = 2x16 serial LCD (KS-0074), new keypad
100 3 = 2x16 parallel LCD (Hantronix), no keypad
101 4 = 2x16 parallel LCD (Nexcom NSA1045) with Nexcom's keypad
102 5 = 2x40 parallel LCD (old one), with old keypad
104 Custom configurations allow you to define how your display is
105 wired to the parallel port, and how it works. This is only intended
109 depends on PANEL_PROFILE="0"
110 int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)"
114 This enables and configures a keypad connected to the parallel port.
115 The keys will be read from character device 10,185. Valid values are :
117 0 : do not enable this driver
118 1 : old 6 keys keypad
119 2 : new 6 keys keypad, as used on the server at www.ant-computing.com
120 3 : Nexcom NSA1045's 4 keys keypad
122 New profiles can be described in the driver source. The driver also
123 supports simultaneous keys pressed when the keypad supports them.
126 depends on PANEL_PROFILE="0"
127 int "LCD type (0=none, 1=custom, 2=old //, 3=ks0074, 4=hantronix, 5=Nexcom)"
131 This enables and configures an LCD connected to the parallel port.
132 The driver includes an interpreter for escape codes starting with
133 '\e[L' which are specific to the LCD, and a few ANSI codes. The
134 driver will be registered as character device 10,156, usually
135 under the name '/dev/lcd'. There are a total of 6 supported types :
137 0 : do not enable the driver
138 1 : custom configuration and wiring (see further)
139 2 : 2x16 & 2x40 parallel LCD (old wiring)
140 3 : 2x16 serial LCD (KS-0074 based)
141 4 : 2x16 parallel LCD (Hantronix wiring)
142 5 : 2x16 parallel LCD (Nexcom wiring)
144 When type '1' is specified, other options will appear to configure
145 more precise aspects (wiring, dimensions, protocol, ...). Please note
146 that those values changed from the 2.4 driver for better consistency.
148 config PANEL_LCD_HEIGHT
149 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
150 int "Number of lines on the LCD (1-2)"
154 This is the number of visible character lines on the LCD in custom profile.
155 It can either be 1 or 2.
157 config PANEL_LCD_WIDTH
158 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
159 int "Number of characters per line on the LCD (1-40)"
163 This is the number of characters per line on the LCD in custom profile.
164 Common values are 16,20,24,40.
166 config PANEL_LCD_BWIDTH
167 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
168 int "Internal LCD line width (1-40, 40 by default)"
172 Most LCDs use a standard controller which supports hardware lines of 40
173 characters, although sometimes only 16, 20 or 24 of them are really wired
174 to the terminal. This results in some non-visible but addressable characters,
175 and is the case for most parallel LCDs. Other LCDs, and some serial ones,
176 however, use the same line width internally as what is visible. The KS0074
177 for example, uses 16 characters per line for 16 visible characters per line.
179 This option lets you configure the value used by your LCD in 'custom' profile.
180 If you don't know, put '40' here.
182 config PANEL_LCD_HWIDTH
183 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
184 int "Hardware LCD line width (1-64, 64 by default)"
188 Most LCDs use a single address bit to differentiate line 0 and line 1. Since
189 some of them need to be able to address 40 chars with the lower bits, they
190 often use the immediately superior power of 2, which is 64, to address the
193 If you don't know what your LCD uses, in doubt let 16 here for a 2x16, and
196 config PANEL_LCD_CHARSET
197 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
198 int "LCD character set (0=normal, 1=KS0074)"
202 Some controllers such as the KS0074 use a somewhat strange character set
203 where many symbols are at unusual places. The driver knows how to map
204 'standard' ASCII characters to the character sets used by these controllers.
207 0 : normal (untranslated) character set
208 1 : KS0074 character set
210 If you don't know, use the normal one (0).
212 config PANEL_LCD_PROTO
213 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
214 int "LCD communication mode (0=parallel 8 bits, 1=serial)"
218 This driver now supports any serial or parallel LCD wired to a parallel
219 port. But before assigning signals, the driver needs to know if it will
220 be driving a serial LCD or a parallel one. Serial LCDs only use 2 wires
221 (SDA/SCL), while parallel ones use 2 or 3 wires for the control signals
222 (E, RS, sometimes RW), and 4 or 8 for the data. Use 0 here for a 8 bits
223 parallel LCD, and 1 for a serial LCD.
225 config PANEL_LCD_PIN_E
226 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
227 int "Parallel port pin number & polarity connected to the LCD E signal (-17...17) "
231 This describes the number of the parallel port pin to which the LCD 'E'
232 signal has been connected. It can be :
234 0 : no connection (eg: connected to ground)
235 1..17 : directly connected to any of these pins on the DB25 plug
236 -1..-17 : connected to the same pin through an inverter (eg: transistor).
238 Default for the 'E' pin in custom profile is '14' (AUTOFEED).
240 config PANEL_LCD_PIN_RS
241 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
242 int "Parallel port pin number & polarity connected to the LCD RS signal (-17...17) "
246 This describes the number of the parallel port pin to which the LCD 'RS'
247 signal has been connected. It can be :
249 0 : no connection (eg: connected to ground)
250 1..17 : directly connected to any of these pins on the DB25 plug
251 -1..-17 : connected to the same pin through an inverter (eg: transistor).
253 Default for the 'RS' pin in custom profile is '17' (SELECT IN).
255 config PANEL_LCD_PIN_RW
256 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
257 int "Parallel port pin number & polarity connected to the LCD RW signal (-17...17) "
261 This describes the number of the parallel port pin to which the LCD 'RW'
262 signal has been connected. It can be :
264 0 : no connection (eg: connected to ground)
265 1..17 : directly connected to any of these pins on the DB25 plug
266 -1..-17 : connected to the same pin through an inverter (eg: transistor).
268 Default for the 'RW' pin in custom profile is '16' (INIT).
270 config PANEL_LCD_PIN_SCL
271 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
272 int "Parallel port pin number & polarity connected to the LCD SCL signal (-17...17) "
276 This describes the number of the parallel port pin to which the serial
277 LCD 'SCL' signal has been connected. It can be :
279 0 : no connection (eg: connected to ground)
280 1..17 : directly connected to any of these pins on the DB25 plug
281 -1..-17 : connected to the same pin through an inverter (eg: transistor).
283 Default for the 'SCL' pin in custom profile is '1' (STROBE).
285 config PANEL_LCD_PIN_SDA
286 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
287 int "Parallel port pin number & polarity connected to the LCD SDA signal (-17...17) "
291 This describes the number of the parallel port pin to which the serial
292 LCD 'SDA' signal has been connected. It can be :
294 0 : no connection (eg: connected to ground)
295 1..17 : directly connected to any of these pins on the DB25 plug
296 -1..-17 : connected to the same pin through an inverter (eg: transistor).
298 Default for the 'SDA' pin in custom profile is '2' (D0).
300 config PANEL_LCD_PIN_BL
301 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
302 int "Parallel port pin number & polarity connected to the LCD backlight signal (-17...17) "
306 This describes the number of the parallel port pin to which the LCD 'BL' signal
307 has been connected. It can be :
309 0 : no connection (eg: connected to ground)
310 1..17 : directly connected to any of these pins on the DB25 plug
311 -1..-17 : connected to the same pin through an inverter (eg: transistor).
313 Default for the 'BL' pin in custom profile is '0' (uncontrolled).
315 endif # PARPORT_PANEL
317 config PANEL_CHANGE_MESSAGE
318 bool "Change LCD initialization message ?"
319 depends on CHARLCD || LINEDISP
321 This allows you to replace the boot message indicating the kernel version
322 and the driver version with a custom message. This is useful on appliances
323 where a simple 'Starting system' message can be enough to stop a customer
326 If you say 'Y' here, you'll be able to choose a message yourself. Otherwise,
327 say 'N' and keep the default message with the version.
329 config PANEL_BOOT_MESSAGE
330 depends on PANEL_CHANGE_MESSAGE="y"
331 string "New initialization message"
334 This allows you to replace the boot message indicating the kernel version
335 and the driver version with a custom message. This is useful on appliances
336 where a simple 'Starting system' message can be enough to stop a customer
339 An empty message will only clear the display at driver init time. Any other
340 printf()-formatted message is valid with newline and escape codes.
343 prompt "Backlight initial state"
344 default CHARLCD_BL_FLASH
346 Select the initial backlight state on boot or module load.
348 Previously, there was no option for this: the backlight flashed
349 briefly on init. Now you can also turn it off/on.
351 config CHARLCD_BL_OFF
354 Backlight is initially turned off
359 Backlight is initially turned on
361 config CHARLCD_BL_FLASH
364 Backlight is flashed briefly on init
369 # Samsung KS0108 LCD controller section
372 tristate "KS0108 LCD Controller"
373 depends on PARPORT_PC
375 If you have a LCD controlled by one or more KS0108
376 controllers, say Y. You will need also another more specific
379 Depends on Parallel Port support. If you say Y at
380 parport, you will be able to compile this as a module (M)
381 and built-in as well (Y).
383 To compile this as a module, choose M here:
384 the module will be called ks0108.
389 hex "Parallel port where the LCD is connected"
393 The address of the parallel port where the LCD is connected.
395 The first standard parallel port address is 0x378.
396 The second standard parallel port address is 0x278.
397 The third standard parallel port address is 0x3BC.
399 You can specify a different address if you need.
401 If you don't know what I'm talking about, load the parport module,
402 and execute "dmesg" or "cat /proc/ioports". You can see there how
403 many parallel ports are present and which address each one has.
405 Usually you only need to use 0x378.
407 If you compile this as a module, you can still override this
408 using the module parameters.
411 int "Delay between each control writing (microseconds)"
415 Amount of time the ks0108 should wait between each control write
416 to the parallel port.
418 If your LCD seems to miss random writings, increment this.
420 If you don't know what I'm talking about, ignore it.
422 If you compile this as a module, you can still override this
423 value using the module parameters.
426 tristate "CFAG12864B LCD"
430 select FB_SYSMEM_HELPERS
432 If you have a Crystalfontz 128x64 2-color LCD, cfag12864b Series,
433 say Y. You also need the ks0108 LCD Controller driver.
435 For help about how to wire your LCD to the parallel port,
436 check Documentation/admin-guide/auxdisplay/cfag12864b.rst
438 Depends on the x86 arch and the framebuffer support.
440 The LCD framebuffer driver can be attached to a console.
441 It will work fine. However, you can't attach it to the fbdev driver
444 To compile this as a module, choose M here:
445 the modules will be called cfag12864b and cfag12864bfb.
449 config CFAG12864B_RATE
450 int "Refresh rate (hertz)"
451 depends on CFAG12864B
454 Refresh rate of the LCD.
456 As the LCD is not memory mapped, the driver has to make the work by
457 software. This means you should be careful setting this value higher.
458 If your CPUs are really slow or you feel the system is slowed down,
461 Be careful modifying this value to a very high value:
462 You can freeze the computer, or the LCD maybe can't draw as fast as you
465 If you don't know what I'm talking about, ignore it.
467 If you compile this as a module, you can still override this
468 value using the module parameters.
471 # Single character line display section
474 tristate "Character line display core support" if COMPILE_TEST
476 This is the core support for single-line character displays, to be
477 selected by drivers that use it.
480 tristate "Imagination Technologies ASCII LCD Display"
482 default y if MIPS_MALTA
486 Enable this to support the simple ASCII LCD displays found on
487 development boards such as the MIPS Boston, MIPS Malta & MIPS SEAD3
488 from Imagination Technologies.
491 tristate "Holtek Ht16K33 LED controller with keyscan"
492 depends on FB && I2C && INPUT
493 select FB_SYSMEM_HELPERS
494 select INPUT_MATRIXKMAP
500 Say yes here to add support for Holtek HT16K33, RAM mapping 16*8
501 LED controller driver with keyscan.
504 tristate "Maxim MAX6958/6959 7-segment LED controller"
509 If you say yes here you get support for the following Maxim chips
510 (I2C 7-segment LED display controller):
512 - MAX6959 (input support)
514 This driver can also be built as a module. If so, the module
515 will be called max6959.
518 tristate "Generic 7-segment LED display"
519 depends on GPIOLIB || COMPILE_TEST
522 This driver supports a generic 7-segment LED display made up
523 of GPIO pins connected to the individual segments.
525 This driver can also be built as a module. If so, the module
526 will be called seg-led-gpio.
529 # Character LCD with non-conforming interface section
532 bool "ARM Ltd. Character LCD Driver"
533 depends on PLAT_VERSATILE
535 This is a driver for the character LCD found on the ARM Ltd.
536 Versatile and RealView Platform Baseboards. It doesn't do
537 very much more than display the text "ARM Linux" on the first
538 line and the Linux version on the second line, but that's
547 tristate "Parallel port LCD/Keypad Panel support (OLD OPTION)"