1 # SPDX-License-Identifier: GPL-2.0
3 # For a description of the syntax of this configuration file,
4 # see Documentation/kbuild/kconfig-language.txt.
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.
18 tristate "Character LCD core support" if COMPILE_TEST
23 tristate "HD44780 Character LCD support"
24 depends on GPIOLIB || COMPILE_TEST
27 Enable support for Character LCDs using a HD44780 controller.
28 The LCD is accessible through the /dev/lcd char device (10, 156).
29 This code can either be compiled as a module, or linked into the
30 kernel and started at boot.
31 If you don't understand what all this is about, say N.
34 tristate "KS0108 LCD Controller"
38 If you have a LCD controlled by one or more KS0108
39 controllers, say Y. You will need also another more specific
42 Depends on Parallel Port support. If you say Y at
43 parport, you will be able to compile this as a module (M)
44 and built-in as well (Y).
46 To compile this as a module, choose M here:
47 the module will be called ks0108.
52 hex "Parallel port where the LCD is connected"
56 The address of the parallel port where the LCD is connected.
58 The first standard parallel port address is 0x378.
59 The second standard parallel port address is 0x278.
60 The third standard parallel port address is 0x3BC.
62 You can specify a different address if you need.
64 If you don't know what I'm talking about, load the parport module,
65 and execute "dmesg" or "cat /proc/ioports". You can see there how
66 many parallel ports are present and which address each one has.
68 Usually you only need to use 0x378.
70 If you compile this as a module, you can still override this
71 using the module parameters.
74 int "Delay between each control writing (microseconds)"
78 Amount of time the ks0108 should wait between each control write
81 If your LCD seems to miss random writings, increment this.
83 If you don't know what I'm talking about, ignore it.
85 If you compile this as a module, you can still override this
86 value using the module parameters.
89 tristate "CFAG12864B LCD"
93 select FB_SYS_FILLRECT
94 select FB_SYS_COPYAREA
95 select FB_SYS_IMAGEBLIT
99 If you have a Crystalfontz 128x64 2-color LCD, cfag12864b Series,
100 say Y. You also need the ks0108 LCD Controller driver.
102 For help about how to wire your LCD to the parallel port,
103 check Documentation/auxdisplay/cfag12864b
105 Depends on the x86 arch and the framebuffer support.
107 The LCD framebuffer driver can be attached to a console.
108 It will work fine. However, you can't attach it to the fbdev driver
111 To compile this as a module, choose M here:
112 the modules will be called cfag12864b and cfag12864bfb.
116 config CFAG12864B_RATE
117 int "Refresh rate (hertz)"
118 depends on CFAG12864B
121 Refresh rate of the LCD.
123 As the LCD is not memory mapped, the driver has to make the work by
124 software. This means you should be careful setting this value higher.
125 If your CPUs are really slow or you feel the system is slowed down,
128 Be careful modifying this value to a very high value:
129 You can freeze the computer, or the LCD maybe can't draw as fast as you
132 If you don't know what I'm talking about, ignore it.
134 If you compile this as a module, you can still override this
135 value using the module parameters.
138 tristate "Imagination Technologies ASCII LCD Display"
140 default y if MIPS_MALTA || MIPS_SEAD3
143 Enable this to support the simple ASCII LCD displays found on
144 development boards such as the MIPS Boston, MIPS Malta & MIPS SEAD3
145 from Imagination Technologies.
148 tristate "Holtek Ht16K33 LED controller with keyscan"
149 depends on FB && OF && I2C && INPUT
151 select FB_SYS_FILLRECT
152 select FB_SYS_COPYAREA
153 select FB_SYS_IMAGEBLIT
154 select INPUT_MATRIXKMAP
157 Say yes here to add support for Holtek HT16K33, RAM mapping 16*8
158 LED controller driver with keyscan.
163 bool "ARM Ltd. Character LCD Driver"
164 depends on PLAT_VERSATILE
166 This is a driver for the character LCD found on the ARM Ltd.
167 Versatile and RealView Platform Baseboards. It doesn't do
168 very much more than display the text "ARM Linux" on the first
169 line and the Linux version on the second line, but that's
173 tristate "Parallel port LCD/Keypad Panel support"
177 Say Y here if you have an HD44780 or KS-0074 LCD connected to your
178 parallel port. This driver also features 4 and 6-key keypads. The LCD
179 is accessible through the /dev/lcd char device (10, 156), and the
180 keypad through /dev/keypad (10, 185). This code can either be
181 compiled as a module, or linked into the kernel and started at boot.
182 If you don't understand what all this is about, say N.
187 int "Default parallel port number (0=LPT1)"
191 This is the index of the parallel port the panel is connected to. One
192 driver instance only supports one parallel port, so if your keypad
193 and LCD are connected to two separate ports, you have to start two
194 modules with different arguments. Numbering starts with '0' for LPT1,
198 int "Default panel profile (0-5, 0=custom)"
202 To ease configuration, the driver supports different configuration
203 profiles for past and recent wirings. These profiles can also be
204 used to define an approximative configuration, completed by a few
205 other options. Here are the profiles :
207 0 = custom (see further)
208 1 = 2x16 parallel LCD, old keypad
209 2 = 2x16 serial LCD (KS-0074), new keypad
210 3 = 2x16 parallel LCD (Hantronix), no keypad
211 4 = 2x16 parallel LCD (Nexcom NSA1045) with Nexcom's keypad
212 5 = 2x40 parallel LCD (old one), with old keypad
214 Custom configurations allow you to define how your display is
215 wired to the parallel port, and how it works. This is only intended
219 depends on PANEL_PROFILE="0"
220 int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)"
224 This enables and configures a keypad connected to the parallel port.
225 The keys will be read from character device 10,185. Valid values are :
227 0 : do not enable this driver
228 1 : old 6 keys keypad
229 2 : new 6 keys keypad, as used on the server at www.ant-computing.com
230 3 : Nexcom NSA1045's 4 keys keypad
232 New profiles can be described in the driver source. The driver also
233 supports simultaneous keys pressed when the keypad supports them.
236 depends on PANEL_PROFILE="0"
237 int "LCD type (0=none, 1=custom, 2=old //, 3=ks0074, 4=hantronix, 5=Nexcom)"
241 This enables and configures an LCD connected to the parallel port.
242 The driver includes an interpreter for escape codes starting with
243 '\e[L' which are specific to the LCD, and a few ANSI codes. The
244 driver will be registered as character device 10,156, usually
245 under the name '/dev/lcd'. There are a total of 6 supported types :
247 0 : do not enable the driver
248 1 : custom configuration and wiring (see further)
249 2 : 2x16 & 2x40 parallel LCD (old wiring)
250 3 : 2x16 serial LCD (KS-0074 based)
251 4 : 2x16 parallel LCD (Hantronix wiring)
252 5 : 2x16 parallel LCD (Nexcom wiring)
254 When type '1' is specified, other options will appear to configure
255 more precise aspects (wiring, dimensions, protocol, ...). Please note
256 that those values changed from the 2.4 driver for better consistency.
258 config PANEL_LCD_HEIGHT
259 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
260 int "Number of lines on the LCD (1-2)"
264 This is the number of visible character lines on the LCD in custom profile.
265 It can either be 1 or 2.
267 config PANEL_LCD_WIDTH
268 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
269 int "Number of characters per line on the LCD (1-40)"
273 This is the number of characters per line on the LCD in custom profile.
274 Common values are 16,20,24,40.
276 config PANEL_LCD_BWIDTH
277 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
278 int "Internal LCD line width (1-40, 40 by default)"
282 Most LCDs use a standard controller which supports hardware lines of 40
283 characters, although sometimes only 16, 20 or 24 of them are really wired
284 to the terminal. This results in some non-visible but addressable characters,
285 and is the case for most parallel LCDs. Other LCDs, and some serial ones,
286 however, use the same line width internally as what is visible. The KS0074
287 for example, uses 16 characters per line for 16 visible characters per line.
289 This option lets you configure the value used by your LCD in 'custom' profile.
290 If you don't know, put '40' here.
292 config PANEL_LCD_HWIDTH
293 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
294 int "Hardware LCD line width (1-64, 64 by default)"
298 Most LCDs use a single address bit to differentiate line 0 and line 1. Since
299 some of them need to be able to address 40 chars with the lower bits, they
300 often use the immediately superior power of 2, which is 64, to address the
303 If you don't know what your LCD uses, in doubt let 16 here for a 2x16, and
306 config PANEL_LCD_CHARSET
307 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
308 int "LCD character set (0=normal, 1=KS0074)"
312 Some controllers such as the KS0074 use a somewhat strange character set
313 where many symbols are at unusual places. The driver knows how to map
314 'standard' ASCII characters to the character sets used by these controllers.
317 0 : normal (untranslated) character set
318 1 : KS0074 character set
320 If you don't know, use the normal one (0).
322 config PANEL_LCD_PROTO
323 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
324 int "LCD communication mode (0=parallel 8 bits, 1=serial)"
328 This driver now supports any serial or parallel LCD wired to a parallel
329 port. But before assigning signals, the driver needs to know if it will
330 be driving a serial LCD or a parallel one. Serial LCDs only use 2 wires
331 (SDA/SCL), while parallel ones use 2 or 3 wires for the control signals
332 (E, RS, sometimes RW), and 4 or 8 for the data. Use 0 here for a 8 bits
333 parallel LCD, and 1 for a serial LCD.
335 config PANEL_LCD_PIN_E
336 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
337 int "Parallel port pin number & polarity connected to the LCD E signal (-17...17) "
341 This describes the number of the parallel port pin to which the LCD 'E'
342 signal has been connected. It can be :
344 0 : no connection (eg: connected to ground)
345 1..17 : directly connected to any of these pins on the DB25 plug
346 -1..-17 : connected to the same pin through an inverter (eg: transistor).
348 Default for the 'E' pin in custom profile is '14' (AUTOFEED).
350 config PANEL_LCD_PIN_RS
351 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
352 int "Parallel port pin number & polarity connected to the LCD RS signal (-17...17) "
356 This describes the number of the parallel port pin to which the LCD 'RS'
357 signal has been connected. It can be :
359 0 : no connection (eg: connected to ground)
360 1..17 : directly connected to any of these pins on the DB25 plug
361 -1..-17 : connected to the same pin through an inverter (eg: transistor).
363 Default for the 'RS' pin in custom profile is '17' (SELECT IN).
365 config PANEL_LCD_PIN_RW
366 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
367 int "Parallel port pin number & polarity connected to the LCD RW signal (-17...17) "
371 This describes the number of the parallel port pin to which the LCD 'RW'
372 signal has been connected. It can be :
374 0 : no connection (eg: connected to ground)
375 1..17 : directly connected to any of these pins on the DB25 plug
376 -1..-17 : connected to the same pin through an inverter (eg: transistor).
378 Default for the 'RW' pin in custom profile is '16' (INIT).
380 config PANEL_LCD_PIN_SCL
381 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
382 int "Parallel port pin number & polarity connected to the LCD SCL signal (-17...17) "
386 This describes the number of the parallel port pin to which the serial
387 LCD 'SCL' signal has been connected. It can be :
389 0 : no connection (eg: connected to ground)
390 1..17 : directly connected to any of these pins on the DB25 plug
391 -1..-17 : connected to the same pin through an inverter (eg: transistor).
393 Default for the 'SCL' pin in custom profile is '1' (STROBE).
395 config PANEL_LCD_PIN_SDA
396 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
397 int "Parallel port pin number & polarity connected to the LCD SDA signal (-17...17) "
401 This describes the number of the parallel port pin to which the serial
402 LCD 'SDA' signal has been connected. It can be :
404 0 : no connection (eg: connected to ground)
405 1..17 : directly connected to any of these pins on the DB25 plug
406 -1..-17 : connected to the same pin through an inverter (eg: transistor).
408 Default for the 'SDA' pin in custom profile is '2' (D0).
410 config PANEL_LCD_PIN_BL
411 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
412 int "Parallel port pin number & polarity connected to the LCD backlight signal (-17...17) "
416 This describes the number of the parallel port pin to which the LCD 'BL' signal
417 has been connected. It can be :
419 0 : no connection (eg: connected to ground)
420 1..17 : directly connected to any of these pins on the DB25 plug
421 -1..-17 : connected to the same pin through an inverter (eg: transistor).
423 Default for the 'BL' pin in custom profile is '0' (uncontrolled).
425 config PANEL_CHANGE_MESSAGE
426 bool "Change LCD initialization message ?"
429 This allows you to replace the boot message indicating the kernel version
430 and the driver version with a custom message. This is useful on appliances
431 where a simple 'Starting system' message can be enough to stop a customer
434 If you say 'Y' here, you'll be able to choose a message yourself. Otherwise,
435 say 'N' and keep the default message with the version.
437 config PANEL_BOOT_MESSAGE
438 depends on PANEL_CHANGE_MESSAGE="y"
439 string "New initialization message"
442 This allows you to replace the boot message indicating the kernel version
443 and the driver version with a custom message. This is useful on appliances
444 where a simple 'Starting system' message can be enough to stop a customer
447 An empty message will only clear the display at driver init time. Any other
448 printf()-formatted message is valid with newline and escape codes.