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 tristate "Character LCD core support" if COMPILE_TEST
22 This is the base system for character-based LCD displays.
23 It makes no sense to have this alone, you select your display driver
24 and if it needs the charlcd core, it will select it automatically.
25 This is some character LCD core interface that multiple drivers can
29 tristate "Character line display core support" if COMPILE_TEST
31 This is the core support for single-line character displays, to be
32 selected by drivers that use it.
35 tristate "Common functions for HD44780 (and compatibles) LCD displays" if COMPILE_TEST
38 This is a module with the common symbols for HD44780 (and compatibles)
39 displays. This is the code that multiple other modules use. It is not
40 useful alone. If you have some sort of HD44780 compatible display,
41 you very likely use this. It is selected automatically by selecting
42 your concrete display.
45 tristate "HD44780 Character LCD support"
46 depends on GPIOLIB || COMPILE_TEST
49 Enable support for Character LCDs using a HD44780 controller.
50 The LCD is accessible through the /dev/lcd char device (10, 156).
51 This code can either be compiled as a module, or linked into the
52 kernel and started at boot.
53 If you don't understand what all this is about, say N.
56 tristate "KS0108 LCD Controller"
60 If you have a LCD controlled by one or more KS0108
61 controllers, say Y. You will need also another more specific
64 Depends on Parallel Port support. If you say Y at
65 parport, you will be able to compile this as a module (M)
66 and built-in as well (Y).
68 To compile this as a module, choose M here:
69 the module will be called ks0108.
74 hex "Parallel port where the LCD is connected"
78 The address of the parallel port where the LCD is connected.
80 The first standard parallel port address is 0x378.
81 The second standard parallel port address is 0x278.
82 The third standard parallel port address is 0x3BC.
84 You can specify a different address if you need.
86 If you don't know what I'm talking about, load the parport module,
87 and execute "dmesg" or "cat /proc/ioports". You can see there how
88 many parallel ports are present and which address each one has.
90 Usually you only need to use 0x378.
92 If you compile this as a module, you can still override this
93 using the module parameters.
96 int "Delay between each control writing (microseconds)"
100 Amount of time the ks0108 should wait between each control write
101 to the parallel port.
103 If your LCD seems to miss random writings, increment this.
105 If you don't know what I'm talking about, ignore it.
107 If you compile this as a module, you can still override this
108 value using the module parameters.
111 tristate "CFAG12864B LCD"
115 select FB_SYSMEM_HELPERS
118 If you have a Crystalfontz 128x64 2-color LCD, cfag12864b Series,
119 say Y. You also need the ks0108 LCD Controller driver.
121 For help about how to wire your LCD to the parallel port,
122 check Documentation/admin-guide/auxdisplay/cfag12864b.rst
124 Depends on the x86 arch and the framebuffer support.
126 The LCD framebuffer driver can be attached to a console.
127 It will work fine. However, you can't attach it to the fbdev driver
130 To compile this as a module, choose M here:
131 the modules will be called cfag12864b and cfag12864bfb.
135 config CFAG12864B_RATE
136 int "Refresh rate (hertz)"
137 depends on CFAG12864B
140 Refresh rate of the LCD.
142 As the LCD is not memory mapped, the driver has to make the work by
143 software. This means you should be careful setting this value higher.
144 If your CPUs are really slow or you feel the system is slowed down,
147 Be careful modifying this value to a very high value:
148 You can freeze the computer, or the LCD maybe can't draw as fast as you
151 If you don't know what I'm talking about, ignore it.
153 If you compile this as a module, you can still override this
154 value using the module parameters.
157 tristate "Imagination Technologies ASCII LCD Display"
159 default y if MIPS_MALTA
163 Enable this to support the simple ASCII LCD displays found on
164 development boards such as the MIPS Boston, MIPS Malta & MIPS SEAD3
165 from Imagination Technologies.
168 tristate "Holtek Ht16K33 LED controller with keyscan"
169 depends on FB && I2C && INPUT
170 select FB_SYSMEM_HELPERS
171 select INPUT_MATRIXKMAP
177 Say yes here to add support for Holtek HT16K33, RAM mapping 16*8
178 LED controller driver with keyscan.
181 tristate "Maxim MAX6958/6959 7-segment LED controller"
186 If you say yes here you get support for the following Maxim chips
187 (I2C 7-segment LED display controller):
189 - MAX6959 (input support)
191 This driver can also be built as a module. If so, the module
192 will be called max6959.
195 tristate "lcd2s 20x4 character display over I2C console"
199 This is a driver that lets you use the lcd2s 20x4 character display
200 from Modtronix engineering as a console output device. The display
201 is a simple single color character display. You have to connect it
205 bool "ARM Ltd. Character LCD Driver"
206 depends on PLAT_VERSATILE
208 This is a driver for the character LCD found on the ARM Ltd.
209 Versatile and RealView Platform Baseboards. It doesn't do
210 very much more than display the text "ARM Linux" on the first
211 line and the Linux version on the second line, but that's
215 tristate "Generic 7-segment LED display"
216 depends on GPIOLIB || COMPILE_TEST
219 This driver supports a generic 7-segment LED display made up
220 of GPIO pins connected to the individual segments.
222 This driver can also be built as a module. If so, the module
223 will be called seg-led-gpio.
225 menuconfig PARPORT_PANEL
226 tristate "Parallel port LCD/Keypad Panel support"
228 select HD44780_COMMON
230 Say Y here if you have an HD44780 or KS-0074 LCD connected to your
231 parallel port. This driver also features 4 and 6-key keypads. The LCD
232 is accessible through the /dev/lcd char device (10, 156), and the
233 keypad through /dev/keypad (10, 185). This code can either be
234 compiled as a module, or linked into the kernel and started at boot.
235 If you don't understand what all this is about, say N.
240 int "Default parallel port number (0=LPT1)"
244 This is the index of the parallel port the panel is connected to. One
245 driver instance only supports one parallel port, so if your keypad
246 and LCD are connected to two separate ports, you have to start two
247 modules with different arguments. Numbering starts with '0' for LPT1,
251 int "Default panel profile (0-5, 0=custom)"
255 To ease configuration, the driver supports different configuration
256 profiles for past and recent wirings. These profiles can also be
257 used to define an approximative configuration, completed by a few
258 other options. Here are the profiles :
260 0 = custom (see further)
261 1 = 2x16 parallel LCD, old keypad
262 2 = 2x16 serial LCD (KS-0074), new keypad
263 3 = 2x16 parallel LCD (Hantronix), no keypad
264 4 = 2x16 parallel LCD (Nexcom NSA1045) with Nexcom's keypad
265 5 = 2x40 parallel LCD (old one), with old keypad
267 Custom configurations allow you to define how your display is
268 wired to the parallel port, and how it works. This is only intended
272 depends on PANEL_PROFILE="0"
273 int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)"
277 This enables and configures a keypad connected to the parallel port.
278 The keys will be read from character device 10,185. Valid values are :
280 0 : do not enable this driver
281 1 : old 6 keys keypad
282 2 : new 6 keys keypad, as used on the server at www.ant-computing.com
283 3 : Nexcom NSA1045's 4 keys keypad
285 New profiles can be described in the driver source. The driver also
286 supports simultaneous keys pressed when the keypad supports them.
289 depends on PANEL_PROFILE="0"
290 int "LCD type (0=none, 1=custom, 2=old //, 3=ks0074, 4=hantronix, 5=Nexcom)"
294 This enables and configures an LCD connected to the parallel port.
295 The driver includes an interpreter for escape codes starting with
296 '\e[L' which are specific to the LCD, and a few ANSI codes. The
297 driver will be registered as character device 10,156, usually
298 under the name '/dev/lcd'. There are a total of 6 supported types :
300 0 : do not enable the driver
301 1 : custom configuration and wiring (see further)
302 2 : 2x16 & 2x40 parallel LCD (old wiring)
303 3 : 2x16 serial LCD (KS-0074 based)
304 4 : 2x16 parallel LCD (Hantronix wiring)
305 5 : 2x16 parallel LCD (Nexcom wiring)
307 When type '1' is specified, other options will appear to configure
308 more precise aspects (wiring, dimensions, protocol, ...). Please note
309 that those values changed from the 2.4 driver for better consistency.
311 config PANEL_LCD_HEIGHT
312 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
313 int "Number of lines on the LCD (1-2)"
317 This is the number of visible character lines on the LCD in custom profile.
318 It can either be 1 or 2.
320 config PANEL_LCD_WIDTH
321 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
322 int "Number of characters per line on the LCD (1-40)"
326 This is the number of characters per line on the LCD in custom profile.
327 Common values are 16,20,24,40.
329 config PANEL_LCD_BWIDTH
330 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
331 int "Internal LCD line width (1-40, 40 by default)"
335 Most LCDs use a standard controller which supports hardware lines of 40
336 characters, although sometimes only 16, 20 or 24 of them are really wired
337 to the terminal. This results in some non-visible but addressable characters,
338 and is the case for most parallel LCDs. Other LCDs, and some serial ones,
339 however, use the same line width internally as what is visible. The KS0074
340 for example, uses 16 characters per line for 16 visible characters per line.
342 This option lets you configure the value used by your LCD in 'custom' profile.
343 If you don't know, put '40' here.
345 config PANEL_LCD_HWIDTH
346 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
347 int "Hardware LCD line width (1-64, 64 by default)"
351 Most LCDs use a single address bit to differentiate line 0 and line 1. Since
352 some of them need to be able to address 40 chars with the lower bits, they
353 often use the immediately superior power of 2, which is 64, to address the
356 If you don't know what your LCD uses, in doubt let 16 here for a 2x16, and
359 config PANEL_LCD_CHARSET
360 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
361 int "LCD character set (0=normal, 1=KS0074)"
365 Some controllers such as the KS0074 use a somewhat strange character set
366 where many symbols are at unusual places. The driver knows how to map
367 'standard' ASCII characters to the character sets used by these controllers.
370 0 : normal (untranslated) character set
371 1 : KS0074 character set
373 If you don't know, use the normal one (0).
375 config PANEL_LCD_PROTO
376 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
377 int "LCD communication mode (0=parallel 8 bits, 1=serial)"
381 This driver now supports any serial or parallel LCD wired to a parallel
382 port. But before assigning signals, the driver needs to know if it will
383 be driving a serial LCD or a parallel one. Serial LCDs only use 2 wires
384 (SDA/SCL), while parallel ones use 2 or 3 wires for the control signals
385 (E, RS, sometimes RW), and 4 or 8 for the data. Use 0 here for a 8 bits
386 parallel LCD, and 1 for a serial LCD.
388 config PANEL_LCD_PIN_E
389 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
390 int "Parallel port pin number & polarity connected to the LCD E signal (-17...17) "
394 This describes the number of the parallel port pin to which the LCD 'E'
395 signal has been connected. It can be :
397 0 : no connection (eg: connected to ground)
398 1..17 : directly connected to any of these pins on the DB25 plug
399 -1..-17 : connected to the same pin through an inverter (eg: transistor).
401 Default for the 'E' pin in custom profile is '14' (AUTOFEED).
403 config PANEL_LCD_PIN_RS
404 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
405 int "Parallel port pin number & polarity connected to the LCD RS signal (-17...17) "
409 This describes the number of the parallel port pin to which the LCD 'RS'
410 signal has been connected. It can be :
412 0 : no connection (eg: connected to ground)
413 1..17 : directly connected to any of these pins on the DB25 plug
414 -1..-17 : connected to the same pin through an inverter (eg: transistor).
416 Default for the 'RS' pin in custom profile is '17' (SELECT IN).
418 config PANEL_LCD_PIN_RW
419 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
420 int "Parallel port pin number & polarity connected to the LCD RW signal (-17...17) "
424 This describes the number of the parallel port pin to which the LCD 'RW'
425 signal has been connected. It can be :
427 0 : no connection (eg: connected to ground)
428 1..17 : directly connected to any of these pins on the DB25 plug
429 -1..-17 : connected to the same pin through an inverter (eg: transistor).
431 Default for the 'RW' pin in custom profile is '16' (INIT).
433 config PANEL_LCD_PIN_SCL
434 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
435 int "Parallel port pin number & polarity connected to the LCD SCL signal (-17...17) "
439 This describes the number of the parallel port pin to which the serial
440 LCD 'SCL' signal has been connected. It can be :
442 0 : no connection (eg: connected to ground)
443 1..17 : directly connected to any of these pins on the DB25 plug
444 -1..-17 : connected to the same pin through an inverter (eg: transistor).
446 Default for the 'SCL' pin in custom profile is '1' (STROBE).
448 config PANEL_LCD_PIN_SDA
449 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
450 int "Parallel port pin number & polarity connected to the LCD SDA signal (-17...17) "
454 This describes the number of the parallel port pin to which the serial
455 LCD 'SDA' signal has been connected. It can be :
457 0 : no connection (eg: connected to ground)
458 1..17 : directly connected to any of these pins on the DB25 plug
459 -1..-17 : connected to the same pin through an inverter (eg: transistor).
461 Default for the 'SDA' pin in custom profile is '2' (D0).
463 config PANEL_LCD_PIN_BL
464 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
465 int "Parallel port pin number & polarity connected to the LCD backlight signal (-17...17) "
469 This describes the number of the parallel port pin to which the LCD 'BL' signal
470 has been connected. It can be :
472 0 : no connection (eg: connected to ground)
473 1..17 : directly connected to any of these pins on the DB25 plug
474 -1..-17 : connected to the same pin through an inverter (eg: transistor).
476 Default for the 'BL' pin in custom profile is '0' (uncontrolled).
478 endif # PARPORT_PANEL
480 config PANEL_CHANGE_MESSAGE
481 bool "Change LCD initialization message ?"
485 This allows you to replace the boot message indicating the kernel version
486 and the driver version with a custom message. This is useful on appliances
487 where a simple 'Starting system' message can be enough to stop a customer
490 If you say 'Y' here, you'll be able to choose a message yourself. Otherwise,
491 say 'N' and keep the default message with the version.
493 config PANEL_BOOT_MESSAGE
494 depends on PANEL_CHANGE_MESSAGE="y"
495 string "New initialization message"
498 This allows you to replace the boot message indicating the kernel version
499 and the driver version with a custom message. This is useful on appliances
500 where a simple 'Starting system' message can be enough to stop a customer
503 An empty message will only clear the display at driver init time. Any other
504 printf()-formatted message is valid with newline and escape codes.
507 prompt "Backlight initial state"
508 default CHARLCD_BL_FLASH
510 Select the initial backlight state on boot or module load.
512 Previously, there was no option for this: the backlight flashed
513 briefly on init. Now you can also turn it off/on.
515 config CHARLCD_BL_OFF
518 Backlight is initially turned off
523 Backlight is initially turned on
525 config CHARLCD_BL_FLASH
528 Backlight is flashed briefly on init
535 tristate "Parallel port LCD/Keypad Panel support (OLD OPTION)"