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 "HD44780 Character LCD support"
21 depends on GPIOLIB || COMPILE_TEST
24 Enable support for Character LCDs using a HD44780 controller.
25 The LCD is accessible through the /dev/lcd char device (10, 156).
26 This code can either be compiled as a module, or linked into the
27 kernel and started at boot.
28 If you don't understand what all this is about, say N.
31 tristate "KS0108 LCD Controller"
35 If you have a LCD controlled by one or more KS0108
36 controllers, say Y. You will need also another more specific
39 Depends on Parallel Port support. If you say Y at
40 parport, you will be able to compile this as a module (M)
41 and built-in as well (Y).
43 To compile this as a module, choose M here:
44 the module will be called ks0108.
49 hex "Parallel port where the LCD is connected"
53 The address of the parallel port where the LCD is connected.
55 The first standard parallel port address is 0x378.
56 The second standard parallel port address is 0x278.
57 The third standard parallel port address is 0x3BC.
59 You can specify a different address if you need.
61 If you don't know what I'm talking about, load the parport module,
62 and execute "dmesg" or "cat /proc/ioports". You can see there how
63 many parallel ports are present and which address each one has.
65 Usually you only need to use 0x378.
67 If you compile this as a module, you can still override this
68 using the module parameters.
71 int "Delay between each control writing (microseconds)"
75 Amount of time the ks0108 should wait between each control write
78 If your LCD seems to miss random writings, increment this.
80 If you don't know what I'm talking about, ignore it.
82 If you compile this as a module, you can still override this
83 value using the module parameters.
86 tristate "CFAG12864B LCD"
90 select FB_SYS_FILLRECT
91 select FB_SYS_COPYAREA
92 select FB_SYS_IMAGEBLIT
96 If you have a Crystalfontz 128x64 2-color LCD, cfag12864b Series,
97 say Y. You also need the ks0108 LCD Controller driver.
99 For help about how to wire your LCD to the parallel port,
100 check Documentation/admin-guide/auxdisplay/cfag12864b.rst
102 Depends on the x86 arch and the framebuffer support.
104 The LCD framebuffer driver can be attached to a console.
105 It will work fine. However, you can't attach it to the fbdev driver
108 To compile this as a module, choose M here:
109 the modules will be called cfag12864b and cfag12864bfb.
113 config CFAG12864B_RATE
114 int "Refresh rate (hertz)"
115 depends on CFAG12864B
118 Refresh rate of the LCD.
120 As the LCD is not memory mapped, the driver has to make the work by
121 software. This means you should be careful setting this value higher.
122 If your CPUs are really slow or you feel the system is slowed down,
125 Be careful modifying this value to a very high value:
126 You can freeze the computer, or the LCD maybe can't draw as fast as you
129 If you don't know what I'm talking about, ignore it.
131 If you compile this as a module, you can still override this
132 value using the module parameters.
135 tristate "Imagination Technologies ASCII LCD Display"
137 default y if MIPS_MALTA
140 Enable this to support the simple ASCII LCD displays found on
141 development boards such as the MIPS Boston, MIPS Malta & MIPS SEAD3
142 from Imagination Technologies.
145 tristate "Holtek Ht16K33 LED controller with keyscan"
146 depends on FB && OF && I2C && INPUT
148 select FB_SYS_FILLRECT
149 select FB_SYS_COPYAREA
150 select FB_SYS_IMAGEBLIT
151 select INPUT_MATRIXKMAP
154 Say yes here to add support for Holtek HT16K33, RAM mapping 16*8
155 LED controller driver with keyscan.
158 bool "ARM Ltd. Character LCD Driver"
159 depends on PLAT_VERSATILE
161 This is a driver for the character LCD found on the ARM Ltd.
162 Versatile and RealView Platform Baseboards. It doesn't do
163 very much more than display the text "ARM Linux" on the first
164 line and the Linux version on the second line, but that's
167 menuconfig PARPORT_PANEL
168 tristate "Parallel port LCD/Keypad Panel support"
172 Say Y here if you have an HD44780 or KS-0074 LCD connected to your
173 parallel port. This driver also features 4 and 6-key keypads. The LCD
174 is accessible through the /dev/lcd char device (10, 156), and the
175 keypad through /dev/keypad (10, 185). This code can either be
176 compiled as a module, or linked into the kernel and started at boot.
177 If you don't understand what all this is about, say N.
182 int "Default parallel port number (0=LPT1)"
186 This is the index of the parallel port the panel is connected to. One
187 driver instance only supports one parallel port, so if your keypad
188 and LCD are connected to two separate ports, you have to start two
189 modules with different arguments. Numbering starts with '0' for LPT1,
193 int "Default panel profile (0-5, 0=custom)"
197 To ease configuration, the driver supports different configuration
198 profiles for past and recent wirings. These profiles can also be
199 used to define an approximative configuration, completed by a few
200 other options. Here are the profiles :
202 0 = custom (see further)
203 1 = 2x16 parallel LCD, old keypad
204 2 = 2x16 serial LCD (KS-0074), new keypad
205 3 = 2x16 parallel LCD (Hantronix), no keypad
206 4 = 2x16 parallel LCD (Nexcom NSA1045) with Nexcom's keypad
207 5 = 2x40 parallel LCD (old one), with old keypad
209 Custom configurations allow you to define how your display is
210 wired to the parallel port, and how it works. This is only intended
214 depends on PANEL_PROFILE="0"
215 int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)"
219 This enables and configures a keypad connected to the parallel port.
220 The keys will be read from character device 10,185. Valid values are :
222 0 : do not enable this driver
223 1 : old 6 keys keypad
224 2 : new 6 keys keypad, as used on the server at www.ant-computing.com
225 3 : Nexcom NSA1045's 4 keys keypad
227 New profiles can be described in the driver source. The driver also
228 supports simultaneous keys pressed when the keypad supports them.
231 depends on PANEL_PROFILE="0"
232 int "LCD type (0=none, 1=custom, 2=old //, 3=ks0074, 4=hantronix, 5=Nexcom)"
236 This enables and configures an LCD connected to the parallel port.
237 The driver includes an interpreter for escape codes starting with
238 '\e[L' which are specific to the LCD, and a few ANSI codes. The
239 driver will be registered as character device 10,156, usually
240 under the name '/dev/lcd'. There are a total of 6 supported types :
242 0 : do not enable the driver
243 1 : custom configuration and wiring (see further)
244 2 : 2x16 & 2x40 parallel LCD (old wiring)
245 3 : 2x16 serial LCD (KS-0074 based)
246 4 : 2x16 parallel LCD (Hantronix wiring)
247 5 : 2x16 parallel LCD (Nexcom wiring)
249 When type '1' is specified, other options will appear to configure
250 more precise aspects (wiring, dimensions, protocol, ...). Please note
251 that those values changed from the 2.4 driver for better consistency.
253 config PANEL_LCD_HEIGHT
254 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
255 int "Number of lines on the LCD (1-2)"
259 This is the number of visible character lines on the LCD in custom profile.
260 It can either be 1 or 2.
262 config PANEL_LCD_WIDTH
263 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
264 int "Number of characters per line on the LCD (1-40)"
268 This is the number of characters per line on the LCD in custom profile.
269 Common values are 16,20,24,40.
271 config PANEL_LCD_BWIDTH
272 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
273 int "Internal LCD line width (1-40, 40 by default)"
277 Most LCDs use a standard controller which supports hardware lines of 40
278 characters, although sometimes only 16, 20 or 24 of them are really wired
279 to the terminal. This results in some non-visible but addressable characters,
280 and is the case for most parallel LCDs. Other LCDs, and some serial ones,
281 however, use the same line width internally as what is visible. The KS0074
282 for example, uses 16 characters per line for 16 visible characters per line.
284 This option lets you configure the value used by your LCD in 'custom' profile.
285 If you don't know, put '40' here.
287 config PANEL_LCD_HWIDTH
288 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
289 int "Hardware LCD line width (1-64, 64 by default)"
293 Most LCDs use a single address bit to differentiate line 0 and line 1. Since
294 some of them need to be able to address 40 chars with the lower bits, they
295 often use the immediately superior power of 2, which is 64, to address the
298 If you don't know what your LCD uses, in doubt let 16 here for a 2x16, and
301 config PANEL_LCD_CHARSET
302 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
303 int "LCD character set (0=normal, 1=KS0074)"
307 Some controllers such as the KS0074 use a somewhat strange character set
308 where many symbols are at unusual places. The driver knows how to map
309 'standard' ASCII characters to the character sets used by these controllers.
312 0 : normal (untranslated) character set
313 1 : KS0074 character set
315 If you don't know, use the normal one (0).
317 config PANEL_LCD_PROTO
318 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
319 int "LCD communication mode (0=parallel 8 bits, 1=serial)"
323 This driver now supports any serial or parallel LCD wired to a parallel
324 port. But before assigning signals, the driver needs to know if it will
325 be driving a serial LCD or a parallel one. Serial LCDs only use 2 wires
326 (SDA/SCL), while parallel ones use 2 or 3 wires for the control signals
327 (E, RS, sometimes RW), and 4 or 8 for the data. Use 0 here for a 8 bits
328 parallel LCD, and 1 for a serial LCD.
330 config PANEL_LCD_PIN_E
331 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
332 int "Parallel port pin number & polarity connected to the LCD E signal (-17...17) "
336 This describes the number of the parallel port pin to which the LCD 'E'
337 signal has been connected. It can be :
339 0 : no connection (eg: connected to ground)
340 1..17 : directly connected to any of these pins on the DB25 plug
341 -1..-17 : connected to the same pin through an inverter (eg: transistor).
343 Default for the 'E' pin in custom profile is '14' (AUTOFEED).
345 config PANEL_LCD_PIN_RS
346 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
347 int "Parallel port pin number & polarity connected to the LCD RS signal (-17...17) "
351 This describes the number of the parallel port pin to which the LCD 'RS'
352 signal has been connected. It can be :
354 0 : no connection (eg: connected to ground)
355 1..17 : directly connected to any of these pins on the DB25 plug
356 -1..-17 : connected to the same pin through an inverter (eg: transistor).
358 Default for the 'RS' pin in custom profile is '17' (SELECT IN).
360 config PANEL_LCD_PIN_RW
361 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
362 int "Parallel port pin number & polarity connected to the LCD RW signal (-17...17) "
366 This describes the number of the parallel port pin to which the LCD 'RW'
367 signal has been connected. It can be :
369 0 : no connection (eg: connected to ground)
370 1..17 : directly connected to any of these pins on the DB25 plug
371 -1..-17 : connected to the same pin through an inverter (eg: transistor).
373 Default for the 'RW' pin in custom profile is '16' (INIT).
375 config PANEL_LCD_PIN_SCL
376 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
377 int "Parallel port pin number & polarity connected to the LCD SCL signal (-17...17) "
381 This describes the number of the parallel port pin to which the serial
382 LCD 'SCL' signal has been connected. It can be :
384 0 : no connection (eg: connected to ground)
385 1..17 : directly connected to any of these pins on the DB25 plug
386 -1..-17 : connected to the same pin through an inverter (eg: transistor).
388 Default for the 'SCL' pin in custom profile is '1' (STROBE).
390 config PANEL_LCD_PIN_SDA
391 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
392 int "Parallel port pin number & polarity connected to the LCD SDA signal (-17...17) "
396 This describes the number of the parallel port pin to which the serial
397 LCD 'SDA' signal has been connected. It can be :
399 0 : no connection (eg: connected to ground)
400 1..17 : directly connected to any of these pins on the DB25 plug
401 -1..-17 : connected to the same pin through an inverter (eg: transistor).
403 Default for the 'SDA' pin in custom profile is '2' (D0).
405 config PANEL_LCD_PIN_BL
406 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
407 int "Parallel port pin number & polarity connected to the LCD backlight signal (-17...17) "
411 This describes the number of the parallel port pin to which the LCD 'BL' signal
412 has been connected. It can be :
414 0 : no connection (eg: connected to ground)
415 1..17 : directly connected to any of these pins on the DB25 plug
416 -1..-17 : connected to the same pin through an inverter (eg: transistor).
418 Default for the 'BL' pin in custom profile is '0' (uncontrolled).
420 endif # PARPORT_PANEL
422 config PANEL_CHANGE_MESSAGE
423 bool "Change LCD initialization message ?"
427 This allows you to replace the boot message indicating the kernel version
428 and the driver version with a custom message. This is useful on appliances
429 where a simple 'Starting system' message can be enough to stop a customer
432 If you say 'Y' here, you'll be able to choose a message yourself. Otherwise,
433 say 'N' and keep the default message with the version.
435 config PANEL_BOOT_MESSAGE
436 depends on PANEL_CHANGE_MESSAGE="y"
437 string "New initialization message"
440 This allows you to replace the boot message indicating the kernel version
441 and the driver version with a custom message. This is useful on appliances
442 where a simple 'Starting system' message can be enough to stop a customer
445 An empty message will only clear the display at driver init time. Any other
446 printf()-formatted message is valid with newline and escape codes.
449 prompt "Backlight initial state"
450 default CHARLCD_BL_FLASH
452 Select the initial backlight state on boot or module load.
454 Previously, there was no option for this: the backlight flashed
455 briefly on init. Now you can also turn it off/on.
457 config CHARLCD_BL_OFF
460 Backlight is initially turned off
465 Backlight is initially turned on
467 config CHARLCD_BL_FLASH
470 Backlight is flashed briefly on init
477 tristate "Parallel port LCD/Keypad Panel support (OLD OPTION)"
483 tristate "Character LCD core support" if COMPILE_TEST