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.
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/auxdisplay/cfag12864b
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
170 tristate "Parallel port LCD/Keypad Panel support"
174 Say Y here if you have an HD44780 or KS-0074 LCD connected to your
175 parallel port. This driver also features 4 and 6-key keypads. The LCD
176 is accessible through the /dev/lcd char device (10, 156), and the
177 keypad through /dev/keypad (10, 185). This code can either be
178 compiled as a module, or linked into the kernel and started at boot.
179 If you don't understand what all this is about, say N.
184 int "Default parallel port number (0=LPT1)"
188 This is the index of the parallel port the panel is connected to. One
189 driver instance only supports one parallel port, so if your keypad
190 and LCD are connected to two separate ports, you have to start two
191 modules with different arguments. Numbering starts with '0' for LPT1,
195 int "Default panel profile (0-5, 0=custom)"
199 To ease configuration, the driver supports different configuration
200 profiles for past and recent wirings. These profiles can also be
201 used to define an approximative configuration, completed by a few
202 other options. Here are the profiles :
204 0 = custom (see further)
205 1 = 2x16 parallel LCD, old keypad
206 2 = 2x16 serial LCD (KS-0074), new keypad
207 3 = 2x16 parallel LCD (Hantronix), no keypad
208 4 = 2x16 parallel LCD (Nexcom NSA1045) with Nexcom's keypad
209 5 = 2x40 parallel LCD (old one), with old keypad
211 Custom configurations allow you to define how your display is
212 wired to the parallel port, and how it works. This is only intended
216 depends on PANEL_PROFILE="0"
217 int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)"
221 This enables and configures a keypad connected to the parallel port.
222 The keys will be read from character device 10,185. Valid values are :
224 0 : do not enable this driver
225 1 : old 6 keys keypad
226 2 : new 6 keys keypad, as used on the server at www.ant-computing.com
227 3 : Nexcom NSA1045's 4 keys keypad
229 New profiles can be described in the driver source. The driver also
230 supports simultaneous keys pressed when the keypad supports them.
233 depends on PANEL_PROFILE="0"
234 int "LCD type (0=none, 1=custom, 2=old //, 3=ks0074, 4=hantronix, 5=Nexcom)"
238 This enables and configures an LCD connected to the parallel port.
239 The driver includes an interpreter for escape codes starting with
240 '\e[L' which are specific to the LCD, and a few ANSI codes. The
241 driver will be registered as character device 10,156, usually
242 under the name '/dev/lcd'. There are a total of 6 supported types :
244 0 : do not enable the driver
245 1 : custom configuration and wiring (see further)
246 2 : 2x16 & 2x40 parallel LCD (old wiring)
247 3 : 2x16 serial LCD (KS-0074 based)
248 4 : 2x16 parallel LCD (Hantronix wiring)
249 5 : 2x16 parallel LCD (Nexcom wiring)
251 When type '1' is specified, other options will appear to configure
252 more precise aspects (wiring, dimensions, protocol, ...). Please note
253 that those values changed from the 2.4 driver for better consistency.
255 config PANEL_LCD_HEIGHT
256 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
257 int "Number of lines on the LCD (1-2)"
261 This is the number of visible character lines on the LCD in custom profile.
262 It can either be 1 or 2.
264 config PANEL_LCD_WIDTH
265 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
266 int "Number of characters per line on the LCD (1-40)"
270 This is the number of characters per line on the LCD in custom profile.
271 Common values are 16,20,24,40.
273 config PANEL_LCD_BWIDTH
274 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
275 int "Internal LCD line width (1-40, 40 by default)"
279 Most LCDs use a standard controller which supports hardware lines of 40
280 characters, although sometimes only 16, 20 or 24 of them are really wired
281 to the terminal. This results in some non-visible but addressable characters,
282 and is the case for most parallel LCDs. Other LCDs, and some serial ones,
283 however, use the same line width internally as what is visible. The KS0074
284 for example, uses 16 characters per line for 16 visible characters per line.
286 This option lets you configure the value used by your LCD in 'custom' profile.
287 If you don't know, put '40' here.
289 config PANEL_LCD_HWIDTH
290 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
291 int "Hardware LCD line width (1-64, 64 by default)"
295 Most LCDs use a single address bit to differentiate line 0 and line 1. Since
296 some of them need to be able to address 40 chars with the lower bits, they
297 often use the immediately superior power of 2, which is 64, to address the
300 If you don't know what your LCD uses, in doubt let 16 here for a 2x16, and
303 config PANEL_LCD_CHARSET
304 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
305 int "LCD character set (0=normal, 1=KS0074)"
309 Some controllers such as the KS0074 use a somewhat strange character set
310 where many symbols are at unusual places. The driver knows how to map
311 'standard' ASCII characters to the character sets used by these controllers.
314 0 : normal (untranslated) character set
315 1 : KS0074 character set
317 If you don't know, use the normal one (0).
319 config PANEL_LCD_PROTO
320 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
321 int "LCD communication mode (0=parallel 8 bits, 1=serial)"
325 This driver now supports any serial or parallel LCD wired to a parallel
326 port. But before assigning signals, the driver needs to know if it will
327 be driving a serial LCD or a parallel one. Serial LCDs only use 2 wires
328 (SDA/SCL), while parallel ones use 2 or 3 wires for the control signals
329 (E, RS, sometimes RW), and 4 or 8 for the data. Use 0 here for a 8 bits
330 parallel LCD, and 1 for a serial LCD.
332 config PANEL_LCD_PIN_E
333 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
334 int "Parallel port pin number & polarity connected to the LCD E signal (-17...17) "
338 This describes the number of the parallel port pin to which the LCD 'E'
339 signal has been connected. It can be :
341 0 : no connection (eg: connected to ground)
342 1..17 : directly connected to any of these pins on the DB25 plug
343 -1..-17 : connected to the same pin through an inverter (eg: transistor).
345 Default for the 'E' pin in custom profile is '14' (AUTOFEED).
347 config PANEL_LCD_PIN_RS
348 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
349 int "Parallel port pin number & polarity connected to the LCD RS signal (-17...17) "
353 This describes the number of the parallel port pin to which the LCD 'RS'
354 signal has been connected. It can be :
356 0 : no connection (eg: connected to ground)
357 1..17 : directly connected to any of these pins on the DB25 plug
358 -1..-17 : connected to the same pin through an inverter (eg: transistor).
360 Default for the 'RS' pin in custom profile is '17' (SELECT IN).
362 config PANEL_LCD_PIN_RW
363 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
364 int "Parallel port pin number & polarity connected to the LCD RW signal (-17...17) "
368 This describes the number of the parallel port pin to which the LCD 'RW'
369 signal has been connected. It can be :
371 0 : no connection (eg: connected to ground)
372 1..17 : directly connected to any of these pins on the DB25 plug
373 -1..-17 : connected to the same pin through an inverter (eg: transistor).
375 Default for the 'RW' pin in custom profile is '16' (INIT).
377 config PANEL_LCD_PIN_SCL
378 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
379 int "Parallel port pin number & polarity connected to the LCD SCL signal (-17...17) "
383 This describes the number of the parallel port pin to which the serial
384 LCD 'SCL' signal has been connected. It can be :
386 0 : no connection (eg: connected to ground)
387 1..17 : directly connected to any of these pins on the DB25 plug
388 -1..-17 : connected to the same pin through an inverter (eg: transistor).
390 Default for the 'SCL' pin in custom profile is '1' (STROBE).
392 config PANEL_LCD_PIN_SDA
393 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
394 int "Parallel port pin number & polarity connected to the LCD SDA signal (-17...17) "
398 This describes the number of the parallel port pin to which the serial
399 LCD 'SDA' signal has been connected. It can be :
401 0 : no connection (eg: connected to ground)
402 1..17 : directly connected to any of these pins on the DB25 plug
403 -1..-17 : connected to the same pin through an inverter (eg: transistor).
405 Default for the 'SDA' pin in custom profile is '2' (D0).
407 config PANEL_LCD_PIN_BL
408 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
409 int "Parallel port pin number & polarity connected to the LCD backlight signal (-17...17) "
413 This describes the number of the parallel port pin to which the LCD 'BL' signal
414 has been connected. It can be :
416 0 : no connection (eg: connected to ground)
417 1..17 : directly connected to any of these pins on the DB25 plug
418 -1..-17 : connected to the same pin through an inverter (eg: transistor).
420 Default for the 'BL' pin in custom profile is '0' (uncontrolled).
422 config PANEL_CHANGE_MESSAGE
423 bool "Change LCD initialization message ?"
426 This allows you to replace the boot message indicating the kernel version
427 and the driver version with a custom message. This is useful on appliances
428 where a simple 'Starting system' message can be enough to stop a customer
431 If you say 'Y' here, you'll be able to choose a message yourself. Otherwise,
432 say 'N' and keep the default message with the version.
434 config PANEL_BOOT_MESSAGE
435 depends on PANEL_CHANGE_MESSAGE="y"
436 string "New initialization message"
439 This allows you to replace the boot message indicating the kernel version
440 and the driver version with a custom message. This is useful on appliances
441 where a simple 'Starting system' message can be enough to stop a customer
444 An empty message will only clear the display at driver init time. Any other
445 printf()-formatted message is valid with newline and escape codes.
450 tristate "Character LCD core support" if COMPILE_TEST