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 "Common functions for HD44780 (and compatibles) LCD displays" if COMPILE_TEST
32 This is a module with the common symbols for HD44780 (and compatibles)
33 displays. This is the code that multiple other modules use. It is not
34 useful alone. If you have some sort of HD44780 compatible display,
35 you very likely use this. It is selected automatically by selecting
36 your concrete display.
39 tristate "HD44780 Character LCD support"
40 depends on GPIOLIB || COMPILE_TEST
43 Enable support for Character LCDs using a HD44780 controller.
44 The LCD is accessible through the /dev/lcd char device (10, 156).
45 This code can either be compiled as a module, or linked into the
46 kernel and started at boot.
47 If you don't understand what all this is about, say N.
50 tristate "KS0108 LCD Controller"
54 If you have a LCD controlled by one or more KS0108
55 controllers, say Y. You will need also another more specific
58 Depends on Parallel Port support. If you say Y at
59 parport, you will be able to compile this as a module (M)
60 and built-in as well (Y).
62 To compile this as a module, choose M here:
63 the module will be called ks0108.
68 hex "Parallel port where the LCD is connected"
72 The address of the parallel port where the LCD is connected.
74 The first standard parallel port address is 0x378.
75 The second standard parallel port address is 0x278.
76 The third standard parallel port address is 0x3BC.
78 You can specify a different address if you need.
80 If you don't know what I'm talking about, load the parport module,
81 and execute "dmesg" or "cat /proc/ioports". You can see there how
82 many parallel ports are present and which address each one has.
84 Usually you only need to use 0x378.
86 If you compile this as a module, you can still override this
87 using the module parameters.
90 int "Delay between each control writing (microseconds)"
94 Amount of time the ks0108 should wait between each control write
97 If your LCD seems to miss random writings, increment this.
99 If you don't know what I'm talking about, ignore it.
101 If you compile this as a module, you can still override this
102 value using the module parameters.
105 tristate "CFAG12864B LCD"
109 select FB_SYS_FILLRECT
110 select FB_SYS_COPYAREA
111 select FB_SYS_IMAGEBLIT
115 If you have a Crystalfontz 128x64 2-color LCD, cfag12864b Series,
116 say Y. You also need the ks0108 LCD Controller driver.
118 For help about how to wire your LCD to the parallel port,
119 check Documentation/admin-guide/auxdisplay/cfag12864b.rst
121 Depends on the x86 arch and the framebuffer support.
123 The LCD framebuffer driver can be attached to a console.
124 It will work fine. However, you can't attach it to the fbdev driver
127 To compile this as a module, choose M here:
128 the modules will be called cfag12864b and cfag12864bfb.
132 config CFAG12864B_RATE
133 int "Refresh rate (hertz)"
134 depends on CFAG12864B
137 Refresh rate of the LCD.
139 As the LCD is not memory mapped, the driver has to make the work by
140 software. This means you should be careful setting this value higher.
141 If your CPUs are really slow or you feel the system is slowed down,
144 Be careful modifying this value to a very high value:
145 You can freeze the computer, or the LCD maybe can't draw as fast as you
148 If you don't know what I'm talking about, ignore it.
150 If you compile this as a module, you can still override this
151 value using the module parameters.
154 tristate "Imagination Technologies ASCII LCD Display"
156 default y if MIPS_MALTA
159 Enable this to support the simple ASCII LCD displays found on
160 development boards such as the MIPS Boston, MIPS Malta & MIPS SEAD3
161 from Imagination Technologies.
164 tristate "Holtek Ht16K33 LED controller with keyscan"
165 depends on FB && OF && I2C && INPUT
167 select FB_SYS_FILLRECT
168 select FB_SYS_COPYAREA
169 select FB_SYS_IMAGEBLIT
170 select INPUT_MATRIXKMAP
173 Say yes here to add support for Holtek HT16K33, RAM mapping 16*8
174 LED controller driver with keyscan.
177 tristate "lcd2s 20x4 character display over I2C console"
181 This is a driver that lets you use the lcd2s 20x4 character display
182 from Modtronix engineering as a console output device. The display
183 is a simple single color character display. You have to connect it
187 bool "ARM Ltd. Character LCD Driver"
188 depends on PLAT_VERSATILE
190 This is a driver for the character LCD found on the ARM Ltd.
191 Versatile and RealView Platform Baseboards. It doesn't do
192 very much more than display the text "ARM Linux" on the first
193 line and the Linux version on the second line, but that's
196 menuconfig PARPORT_PANEL
197 tristate "Parallel port LCD/Keypad Panel support"
199 select HD44780_COMMON
201 Say Y here if you have an HD44780 or KS-0074 LCD connected to your
202 parallel port. This driver also features 4 and 6-key keypads. The LCD
203 is accessible through the /dev/lcd char device (10, 156), and the
204 keypad through /dev/keypad (10, 185). This code can either be
205 compiled as a module, or linked into the kernel and started at boot.
206 If you don't understand what all this is about, say N.
211 int "Default parallel port number (0=LPT1)"
215 This is the index of the parallel port the panel is connected to. One
216 driver instance only supports one parallel port, so if your keypad
217 and LCD are connected to two separate ports, you have to start two
218 modules with different arguments. Numbering starts with '0' for LPT1,
222 int "Default panel profile (0-5, 0=custom)"
226 To ease configuration, the driver supports different configuration
227 profiles for past and recent wirings. These profiles can also be
228 used to define an approximative configuration, completed by a few
229 other options. Here are the profiles :
231 0 = custom (see further)
232 1 = 2x16 parallel LCD, old keypad
233 2 = 2x16 serial LCD (KS-0074), new keypad
234 3 = 2x16 parallel LCD (Hantronix), no keypad
235 4 = 2x16 parallel LCD (Nexcom NSA1045) with Nexcom's keypad
236 5 = 2x40 parallel LCD (old one), with old keypad
238 Custom configurations allow you to define how your display is
239 wired to the parallel port, and how it works. This is only intended
243 depends on PANEL_PROFILE="0"
244 int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)"
248 This enables and configures a keypad connected to the parallel port.
249 The keys will be read from character device 10,185. Valid values are :
251 0 : do not enable this driver
252 1 : old 6 keys keypad
253 2 : new 6 keys keypad, as used on the server at www.ant-computing.com
254 3 : Nexcom NSA1045's 4 keys keypad
256 New profiles can be described in the driver source. The driver also
257 supports simultaneous keys pressed when the keypad supports them.
260 depends on PANEL_PROFILE="0"
261 int "LCD type (0=none, 1=custom, 2=old //, 3=ks0074, 4=hantronix, 5=Nexcom)"
265 This enables and configures an LCD connected to the parallel port.
266 The driver includes an interpreter for escape codes starting with
267 '\e[L' which are specific to the LCD, and a few ANSI codes. The
268 driver will be registered as character device 10,156, usually
269 under the name '/dev/lcd'. There are a total of 6 supported types :
271 0 : do not enable the driver
272 1 : custom configuration and wiring (see further)
273 2 : 2x16 & 2x40 parallel LCD (old wiring)
274 3 : 2x16 serial LCD (KS-0074 based)
275 4 : 2x16 parallel LCD (Hantronix wiring)
276 5 : 2x16 parallel LCD (Nexcom wiring)
278 When type '1' is specified, other options will appear to configure
279 more precise aspects (wiring, dimensions, protocol, ...). Please note
280 that those values changed from the 2.4 driver for better consistency.
282 config PANEL_LCD_HEIGHT
283 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
284 int "Number of lines on the LCD (1-2)"
288 This is the number of visible character lines on the LCD in custom profile.
289 It can either be 1 or 2.
291 config PANEL_LCD_WIDTH
292 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
293 int "Number of characters per line on the LCD (1-40)"
297 This is the number of characters per line on the LCD in custom profile.
298 Common values are 16,20,24,40.
300 config PANEL_LCD_BWIDTH
301 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
302 int "Internal LCD line width (1-40, 40 by default)"
306 Most LCDs use a standard controller which supports hardware lines of 40
307 characters, although sometimes only 16, 20 or 24 of them are really wired
308 to the terminal. This results in some non-visible but addressable characters,
309 and is the case for most parallel LCDs. Other LCDs, and some serial ones,
310 however, use the same line width internally as what is visible. The KS0074
311 for example, uses 16 characters per line for 16 visible characters per line.
313 This option lets you configure the value used by your LCD in 'custom' profile.
314 If you don't know, put '40' here.
316 config PANEL_LCD_HWIDTH
317 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
318 int "Hardware LCD line width (1-64, 64 by default)"
322 Most LCDs use a single address bit to differentiate line 0 and line 1. Since
323 some of them need to be able to address 40 chars with the lower bits, they
324 often use the immediately superior power of 2, which is 64, to address the
327 If you don't know what your LCD uses, in doubt let 16 here for a 2x16, and
330 config PANEL_LCD_CHARSET
331 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
332 int "LCD character set (0=normal, 1=KS0074)"
336 Some controllers such as the KS0074 use a somewhat strange character set
337 where many symbols are at unusual places. The driver knows how to map
338 'standard' ASCII characters to the character sets used by these controllers.
341 0 : normal (untranslated) character set
342 1 : KS0074 character set
344 If you don't know, use the normal one (0).
346 config PANEL_LCD_PROTO
347 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
348 int "LCD communication mode (0=parallel 8 bits, 1=serial)"
352 This driver now supports any serial or parallel LCD wired to a parallel
353 port. But before assigning signals, the driver needs to know if it will
354 be driving a serial LCD or a parallel one. Serial LCDs only use 2 wires
355 (SDA/SCL), while parallel ones use 2 or 3 wires for the control signals
356 (E, RS, sometimes RW), and 4 or 8 for the data. Use 0 here for a 8 bits
357 parallel LCD, and 1 for a serial LCD.
359 config PANEL_LCD_PIN_E
360 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
361 int "Parallel port pin number & polarity connected to the LCD E signal (-17...17) "
365 This describes the number of the parallel port pin to which the LCD 'E'
366 signal has been connected. It can be :
368 0 : no connection (eg: connected to ground)
369 1..17 : directly connected to any of these pins on the DB25 plug
370 -1..-17 : connected to the same pin through an inverter (eg: transistor).
372 Default for the 'E' pin in custom profile is '14' (AUTOFEED).
374 config PANEL_LCD_PIN_RS
375 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
376 int "Parallel port pin number & polarity connected to the LCD RS signal (-17...17) "
380 This describes the number of the parallel port pin to which the LCD 'RS'
381 signal has been connected. It can be :
383 0 : no connection (eg: connected to ground)
384 1..17 : directly connected to any of these pins on the DB25 plug
385 -1..-17 : connected to the same pin through an inverter (eg: transistor).
387 Default for the 'RS' pin in custom profile is '17' (SELECT IN).
389 config PANEL_LCD_PIN_RW
390 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
391 int "Parallel port pin number & polarity connected to the LCD RW signal (-17...17) "
395 This describes the number of the parallel port pin to which the LCD 'RW'
396 signal has been connected. It can be :
398 0 : no connection (eg: connected to ground)
399 1..17 : directly connected to any of these pins on the DB25 plug
400 -1..-17 : connected to the same pin through an inverter (eg: transistor).
402 Default for the 'RW' pin in custom profile is '16' (INIT).
404 config PANEL_LCD_PIN_SCL
405 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
406 int "Parallel port pin number & polarity connected to the LCD SCL signal (-17...17) "
410 This describes the number of the parallel port pin to which the serial
411 LCD 'SCL' signal has been connected. It can be :
413 0 : no connection (eg: connected to ground)
414 1..17 : directly connected to any of these pins on the DB25 plug
415 -1..-17 : connected to the same pin through an inverter (eg: transistor).
417 Default for the 'SCL' pin in custom profile is '1' (STROBE).
419 config PANEL_LCD_PIN_SDA
420 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
421 int "Parallel port pin number & polarity connected to the LCD SDA signal (-17...17) "
425 This describes the number of the parallel port pin to which the serial
426 LCD 'SDA' signal has been connected. It can be :
428 0 : no connection (eg: connected to ground)
429 1..17 : directly connected to any of these pins on the DB25 plug
430 -1..-17 : connected to the same pin through an inverter (eg: transistor).
432 Default for the 'SDA' pin in custom profile is '2' (D0).
434 config PANEL_LCD_PIN_BL
435 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
436 int "Parallel port pin number & polarity connected to the LCD backlight signal (-17...17) "
440 This describes the number of the parallel port pin to which the LCD 'BL' signal
441 has been connected. It can be :
443 0 : no connection (eg: connected to ground)
444 1..17 : directly connected to any of these pins on the DB25 plug
445 -1..-17 : connected to the same pin through an inverter (eg: transistor).
447 Default for the 'BL' pin in custom profile is '0' (uncontrolled).
449 endif # PARPORT_PANEL
451 config PANEL_CHANGE_MESSAGE
452 bool "Change LCD initialization message ?"
456 This allows you to replace the boot message indicating the kernel version
457 and the driver version with a custom message. This is useful on appliances
458 where a simple 'Starting system' message can be enough to stop a customer
461 If you say 'Y' here, you'll be able to choose a message yourself. Otherwise,
462 say 'N' and keep the default message with the version.
464 config PANEL_BOOT_MESSAGE
465 depends on PANEL_CHANGE_MESSAGE="y"
466 string "New initialization message"
469 This allows you to replace the boot message indicating the kernel version
470 and the driver version with a custom message. This is useful on appliances
471 where a simple 'Starting system' message can be enough to stop a customer
474 An empty message will only clear the display at driver init time. Any other
475 printf()-formatted message is valid with newline and escape codes.
478 prompt "Backlight initial state"
479 default CHARLCD_BL_FLASH
481 Select the initial backlight state on boot or module load.
483 Previously, there was no option for this: the backlight flashed
484 briefly on init. Now you can also turn it off/on.
486 config CHARLCD_BL_OFF
489 Backlight is initially turned off
494 Backlight is initially turned on
496 config CHARLCD_BL_FLASH
499 Backlight is flashed briefly on init
506 tristate "Parallel port LCD/Keypad Panel support (OLD OPTION)"
512 tristate "Character LCD core support" if COMPILE_TEST