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_SYS_FILLRECT
116 select FB_SYS_COPYAREA
117 select FB_SYS_IMAGEBLIT
121 If you have a Crystalfontz 128x64 2-color LCD, cfag12864b Series,
122 say Y. You also need the ks0108 LCD Controller driver.
124 For help about how to wire your LCD to the parallel port,
125 check Documentation/admin-guide/auxdisplay/cfag12864b.rst
127 Depends on the x86 arch and the framebuffer support.
129 The LCD framebuffer driver can be attached to a console.
130 It will work fine. However, you can't attach it to the fbdev driver
133 To compile this as a module, choose M here:
134 the modules will be called cfag12864b and cfag12864bfb.
138 config CFAG12864B_RATE
139 int "Refresh rate (hertz)"
140 depends on CFAG12864B
143 Refresh rate of the LCD.
145 As the LCD is not memory mapped, the driver has to make the work by
146 software. This means you should be careful setting this value higher.
147 If your CPUs are really slow or you feel the system is slowed down,
150 Be careful modifying this value to a very high value:
151 You can freeze the computer, or the LCD maybe can't draw as fast as you
154 If you don't know what I'm talking about, ignore it.
156 If you compile this as a module, you can still override this
157 value using the module parameters.
160 tristate "Imagination Technologies ASCII LCD Display"
162 default y if MIPS_MALTA
166 Enable this to support the simple ASCII LCD displays found on
167 development boards such as the MIPS Boston, MIPS Malta & MIPS SEAD3
168 from Imagination Technologies.
171 tristate "Holtek Ht16K33 LED controller with keyscan"
172 depends on FB && I2C && INPUT
174 select FB_SYS_FILLRECT
175 select FB_SYS_COPYAREA
176 select FB_SYS_IMAGEBLIT
177 select INPUT_MATRIXKMAP
183 Say yes here to add support for Holtek HT16K33, RAM mapping 16*8
184 LED controller driver with keyscan.
187 tristate "lcd2s 20x4 character display over I2C console"
191 This is a driver that lets you use the lcd2s 20x4 character display
192 from Modtronix engineering as a console output device. The display
193 is a simple single color character display. You have to connect it
197 bool "ARM Ltd. Character LCD Driver"
198 depends on PLAT_VERSATILE
200 This is a driver for the character LCD found on the ARM Ltd.
201 Versatile and RealView Platform Baseboards. It doesn't do
202 very much more than display the text "ARM Linux" on the first
203 line and the Linux version on the second line, but that's
206 menuconfig PARPORT_PANEL
207 tristate "Parallel port LCD/Keypad Panel support"
209 select HD44780_COMMON
211 Say Y here if you have an HD44780 or KS-0074 LCD connected to your
212 parallel port. This driver also features 4 and 6-key keypads. The LCD
213 is accessible through the /dev/lcd char device (10, 156), and the
214 keypad through /dev/keypad (10, 185). This code can either be
215 compiled as a module, or linked into the kernel and started at boot.
216 If you don't understand what all this is about, say N.
221 int "Default parallel port number (0=LPT1)"
225 This is the index of the parallel port the panel is connected to. One
226 driver instance only supports one parallel port, so if your keypad
227 and LCD are connected to two separate ports, you have to start two
228 modules with different arguments. Numbering starts with '0' for LPT1,
232 int "Default panel profile (0-5, 0=custom)"
236 To ease configuration, the driver supports different configuration
237 profiles for past and recent wirings. These profiles can also be
238 used to define an approximative configuration, completed by a few
239 other options. Here are the profiles :
241 0 = custom (see further)
242 1 = 2x16 parallel LCD, old keypad
243 2 = 2x16 serial LCD (KS-0074), new keypad
244 3 = 2x16 parallel LCD (Hantronix), no keypad
245 4 = 2x16 parallel LCD (Nexcom NSA1045) with Nexcom's keypad
246 5 = 2x40 parallel LCD (old one), with old keypad
248 Custom configurations allow you to define how your display is
249 wired to the parallel port, and how it works. This is only intended
253 depends on PANEL_PROFILE="0"
254 int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)"
258 This enables and configures a keypad connected to the parallel port.
259 The keys will be read from character device 10,185. Valid values are :
261 0 : do not enable this driver
262 1 : old 6 keys keypad
263 2 : new 6 keys keypad, as used on the server at www.ant-computing.com
264 3 : Nexcom NSA1045's 4 keys keypad
266 New profiles can be described in the driver source. The driver also
267 supports simultaneous keys pressed when the keypad supports them.
270 depends on PANEL_PROFILE="0"
271 int "LCD type (0=none, 1=custom, 2=old //, 3=ks0074, 4=hantronix, 5=Nexcom)"
275 This enables and configures an LCD connected to the parallel port.
276 The driver includes an interpreter for escape codes starting with
277 '\e[L' which are specific to the LCD, and a few ANSI codes. The
278 driver will be registered as character device 10,156, usually
279 under the name '/dev/lcd'. There are a total of 6 supported types :
281 0 : do not enable the driver
282 1 : custom configuration and wiring (see further)
283 2 : 2x16 & 2x40 parallel LCD (old wiring)
284 3 : 2x16 serial LCD (KS-0074 based)
285 4 : 2x16 parallel LCD (Hantronix wiring)
286 5 : 2x16 parallel LCD (Nexcom wiring)
288 When type '1' is specified, other options will appear to configure
289 more precise aspects (wiring, dimensions, protocol, ...). Please note
290 that those values changed from the 2.4 driver for better consistency.
292 config PANEL_LCD_HEIGHT
293 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
294 int "Number of lines on the LCD (1-2)"
298 This is the number of visible character lines on the LCD in custom profile.
299 It can either be 1 or 2.
301 config PANEL_LCD_WIDTH
302 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
303 int "Number of characters per line on the LCD (1-40)"
307 This is the number of characters per line on the LCD in custom profile.
308 Common values are 16,20,24,40.
310 config PANEL_LCD_BWIDTH
311 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
312 int "Internal LCD line width (1-40, 40 by default)"
316 Most LCDs use a standard controller which supports hardware lines of 40
317 characters, although sometimes only 16, 20 or 24 of them are really wired
318 to the terminal. This results in some non-visible but addressable characters,
319 and is the case for most parallel LCDs. Other LCDs, and some serial ones,
320 however, use the same line width internally as what is visible. The KS0074
321 for example, uses 16 characters per line for 16 visible characters per line.
323 This option lets you configure the value used by your LCD in 'custom' profile.
324 If you don't know, put '40' here.
326 config PANEL_LCD_HWIDTH
327 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
328 int "Hardware LCD line width (1-64, 64 by default)"
332 Most LCDs use a single address bit to differentiate line 0 and line 1. Since
333 some of them need to be able to address 40 chars with the lower bits, they
334 often use the immediately superior power of 2, which is 64, to address the
337 If you don't know what your LCD uses, in doubt let 16 here for a 2x16, and
340 config PANEL_LCD_CHARSET
341 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
342 int "LCD character set (0=normal, 1=KS0074)"
346 Some controllers such as the KS0074 use a somewhat strange character set
347 where many symbols are at unusual places. The driver knows how to map
348 'standard' ASCII characters to the character sets used by these controllers.
351 0 : normal (untranslated) character set
352 1 : KS0074 character set
354 If you don't know, use the normal one (0).
356 config PANEL_LCD_PROTO
357 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
358 int "LCD communication mode (0=parallel 8 bits, 1=serial)"
362 This driver now supports any serial or parallel LCD wired to a parallel
363 port. But before assigning signals, the driver needs to know if it will
364 be driving a serial LCD or a parallel one. Serial LCDs only use 2 wires
365 (SDA/SCL), while parallel ones use 2 or 3 wires for the control signals
366 (E, RS, sometimes RW), and 4 or 8 for the data. Use 0 here for a 8 bits
367 parallel LCD, and 1 for a serial LCD.
369 config PANEL_LCD_PIN_E
370 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
371 int "Parallel port pin number & polarity connected to the LCD E signal (-17...17) "
375 This describes the number of the parallel port pin to which the LCD 'E'
376 signal has been connected. It can be :
378 0 : no connection (eg: connected to ground)
379 1..17 : directly connected to any of these pins on the DB25 plug
380 -1..-17 : connected to the same pin through an inverter (eg: transistor).
382 Default for the 'E' pin in custom profile is '14' (AUTOFEED).
384 config PANEL_LCD_PIN_RS
385 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
386 int "Parallel port pin number & polarity connected to the LCD RS signal (-17...17) "
390 This describes the number of the parallel port pin to which the LCD 'RS'
391 signal has been connected. It can be :
393 0 : no connection (eg: connected to ground)
394 1..17 : directly connected to any of these pins on the DB25 plug
395 -1..-17 : connected to the same pin through an inverter (eg: transistor).
397 Default for the 'RS' pin in custom profile is '17' (SELECT IN).
399 config PANEL_LCD_PIN_RW
400 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
401 int "Parallel port pin number & polarity connected to the LCD RW signal (-17...17) "
405 This describes the number of the parallel port pin to which the LCD 'RW'
406 signal has been connected. It can be :
408 0 : no connection (eg: connected to ground)
409 1..17 : directly connected to any of these pins on the DB25 plug
410 -1..-17 : connected to the same pin through an inverter (eg: transistor).
412 Default for the 'RW' pin in custom profile is '16' (INIT).
414 config PANEL_LCD_PIN_SCL
415 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
416 int "Parallel port pin number & polarity connected to the LCD SCL signal (-17...17) "
420 This describes the number of the parallel port pin to which the serial
421 LCD 'SCL' signal has been connected. It can be :
423 0 : no connection (eg: connected to ground)
424 1..17 : directly connected to any of these pins on the DB25 plug
425 -1..-17 : connected to the same pin through an inverter (eg: transistor).
427 Default for the 'SCL' pin in custom profile is '1' (STROBE).
429 config PANEL_LCD_PIN_SDA
430 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
431 int "Parallel port pin number & polarity connected to the LCD SDA signal (-17...17) "
435 This describes the number of the parallel port pin to which the serial
436 LCD 'SDA' signal has been connected. It can be :
438 0 : no connection (eg: connected to ground)
439 1..17 : directly connected to any of these pins on the DB25 plug
440 -1..-17 : connected to the same pin through an inverter (eg: transistor).
442 Default for the 'SDA' pin in custom profile is '2' (D0).
444 config PANEL_LCD_PIN_BL
445 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
446 int "Parallel port pin number & polarity connected to the LCD backlight signal (-17...17) "
450 This describes the number of the parallel port pin to which the LCD 'BL' signal
451 has been connected. It can be :
453 0 : no connection (eg: connected to ground)
454 1..17 : directly connected to any of these pins on the DB25 plug
455 -1..-17 : connected to the same pin through an inverter (eg: transistor).
457 Default for the 'BL' pin in custom profile is '0' (uncontrolled).
459 endif # PARPORT_PANEL
461 config PANEL_CHANGE_MESSAGE
462 bool "Change LCD initialization message ?"
466 This allows you to replace the boot message indicating the kernel version
467 and the driver version with a custom message. This is useful on appliances
468 where a simple 'Starting system' message can be enough to stop a customer
471 If you say 'Y' here, you'll be able to choose a message yourself. Otherwise,
472 say 'N' and keep the default message with the version.
474 config PANEL_BOOT_MESSAGE
475 depends on PANEL_CHANGE_MESSAGE="y"
476 string "New initialization message"
479 This allows you to replace the boot message indicating the kernel version
480 and the driver version with a custom message. This is useful on appliances
481 where a simple 'Starting system' message can be enough to stop a customer
484 An empty message will only clear the display at driver init time. Any other
485 printf()-formatted message is valid with newline and escape codes.
488 prompt "Backlight initial state"
489 default CHARLCD_BL_FLASH
491 Select the initial backlight state on boot or module load.
493 Previously, there was no option for this: the backlight flashed
494 briefly on init. Now you can also turn it off/on.
496 config CHARLCD_BL_OFF
499 Backlight is initially turned off
504 Backlight is initially turned on
506 config CHARLCD_BL_FLASH
509 Backlight is flashed briefly on init
516 tristate "Parallel port LCD/Keypad Panel support (OLD OPTION)"