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1# SPDX-License-Identifier: GPL-2.0
2#
3# For a description of the syntax of this configuration file,
4# see Documentation/kbuild/kconfig-language.rst.
5#
6# Auxiliary display drivers configuration.
7#
8
9menuconfig AUXDISPLAY
10 bool "Auxiliary Display support"
11 help
12 Say Y here to get to see options for auxiliary display drivers.
13 This option alone does not add any kernel code.
14
15 If you say N, all options in this submenu will be skipped and disabled.
16
17if AUXDISPLAY
18
19#
20# Character LCD section
21#
22config CHARLCD
23 tristate "Character LCD core support" if COMPILE_TEST
24 help
25 This is the base system for character-based LCD displays.
26 It makes no sense to have this alone, you select your display driver
27 and if it needs the charlcd core, it will select it automatically.
28 This is some character LCD core interface that multiple drivers can
29 use.
30
31config HD44780_COMMON
32 tristate "Common functions for HD44780 (and compatibles) LCD displays" if COMPILE_TEST
33 select CHARLCD
34 help
35 This is a module with the common symbols for HD44780 (and compatibles)
36 displays. This is the code that multiple other modules use. It is not
37 useful alone. If you have some sort of HD44780 compatible display,
38 you very likely use this. It is selected automatically by selecting
39 your concrete display.
40
41config HD44780
42 tristate "HD44780 Character LCD support"
43 depends on GPIOLIB || COMPILE_TEST
44 select HD44780_COMMON
45 help
46 Enable support for Character LCDs using a HD44780 controller.
47 The LCD is accessible through the /dev/lcd char device (10, 156).
48 This code can either be compiled as a module, or linked into the
49 kernel and started at boot.
50 If you don't understand what all this is about, say N.
51
52config LCD2S
53 tristate "lcd2s 20x4 character display over I2C console"
54 depends on I2C
55 select CHARLCD
56 help
57 This is a driver that lets you use the lcd2s 20x4 character display
58 from Modtronix engineering as a console output device. The display
59 is a simple single color character display. You have to connect it
60 to an I2C bus.
61
62menuconfig PARPORT_PANEL
63 tristate "Parallel port LCD/Keypad Panel support"
64 depends on PARPORT
65 select HD44780_COMMON
66 help
67 Say Y here if you have an HD44780 or KS-0074 LCD connected to your
68 parallel port. This driver also features 4 and 6-key keypads. The LCD
69 is accessible through the /dev/lcd char device (10, 156), and the
70 keypad through /dev/keypad (10, 185). This code can either be
71 compiled as a module, or linked into the kernel and started at boot.
72 If you don't understand what all this is about, say N.
73
74if PARPORT_PANEL
75
76config PANEL_PARPORT
77 int "Default parallel port number (0=LPT1)"
78 range 0 255
79 default "0"
80 help
81 This is the index of the parallel port the panel is connected to. One
82 driver instance only supports one parallel port, so if your keypad
83 and LCD are connected to two separate ports, you have to start two
84 modules with different arguments. Numbering starts with '0' for LPT1,
85 and so on.
86
87config PANEL_PROFILE
88 int "Default panel profile (0-5, 0=custom)"
89 range 0 5
90 default "5"
91 help
92 To ease configuration, the driver supports different configuration
93 profiles for past and recent wirings. These profiles can also be
94 used to define an approximative configuration, completed by a few
95 other options. Here are the profiles :
96
97 0 = custom (see further)
98 1 = 2x16 parallel LCD, old keypad
99 2 = 2x16 serial LCD (KS-0074), new keypad
100 3 = 2x16 parallel LCD (Hantronix), no keypad
101 4 = 2x16 parallel LCD (Nexcom NSA1045) with Nexcom's keypad
102 5 = 2x40 parallel LCD (old one), with old keypad
103
104 Custom configurations allow you to define how your display is
105 wired to the parallel port, and how it works. This is only intended
106 for experts.
107
108config PANEL_KEYPAD
109 depends on PANEL_PROFILE="0"
110 int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)"
111 range 0 3
112 default 0
113 help
114 This enables and configures a keypad connected to the parallel port.
115 The keys will be read from character device 10,185. Valid values are :
116
117 0 : do not enable this driver
118 1 : old 6 keys keypad
119 2 : new 6 keys keypad, as used on the server at www.ant-computing.com
120 3 : Nexcom NSA1045's 4 keys keypad
121
122 New profiles can be described in the driver source. The driver also
123 supports simultaneous keys pressed when the keypad supports them.
124
125config PANEL_LCD
126 depends on PANEL_PROFILE="0"
127 int "LCD type (0=none, 1=custom, 2=old //, 3=ks0074, 4=hantronix, 5=Nexcom)"
128 range 0 5
129 default 0
130 help
131 This enables and configures an LCD connected to the parallel port.
132 The driver includes an interpreter for escape codes starting with
133 '\e[L' which are specific to the LCD, and a few ANSI codes. The
134 driver will be registered as character device 10,156, usually
135 under the name '/dev/lcd'. There are a total of 6 supported types :
136
137 0 : do not enable the driver
138 1 : custom configuration and wiring (see further)
139 2 : 2x16 & 2x40 parallel LCD (old wiring)
140 3 : 2x16 serial LCD (KS-0074 based)
141 4 : 2x16 parallel LCD (Hantronix wiring)
142 5 : 2x16 parallel LCD (Nexcom wiring)
143
144 When type '1' is specified, other options will appear to configure
145 more precise aspects (wiring, dimensions, protocol, ...). Please note
146 that those values changed from the 2.4 driver for better consistency.
147
148config PANEL_LCD_HEIGHT
149 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
150 int "Number of lines on the LCD (1-2)"
151 range 1 2
152 default 2
153 help
154 This is the number of visible character lines on the LCD in custom profile.
155 It can either be 1 or 2.
156
157config PANEL_LCD_WIDTH
158 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
159 int "Number of characters per line on the LCD (1-40)"
160 range 1 40
161 default 40
162 help
163 This is the number of characters per line on the LCD in custom profile.
164 Common values are 16,20,24,40.
165
166config PANEL_LCD_BWIDTH
167 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
168 int "Internal LCD line width (1-40, 40 by default)"
169 range 1 40
170 default 40
171 help
172 Most LCDs use a standard controller which supports hardware lines of 40
173 characters, although sometimes only 16, 20 or 24 of them are really wired
174 to the terminal. This results in some non-visible but addressable characters,
175 and is the case for most parallel LCDs. Other LCDs, and some serial ones,
176 however, use the same line width internally as what is visible. The KS0074
177 for example, uses 16 characters per line for 16 visible characters per line.
178
179 This option lets you configure the value used by your LCD in 'custom' profile.
180 If you don't know, put '40' here.
181
182config PANEL_LCD_HWIDTH
183 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
184 int "Hardware LCD line width (1-64, 64 by default)"
185 range 1 64
186 default 64
187 help
188 Most LCDs use a single address bit to differentiate line 0 and line 1. Since
189 some of them need to be able to address 40 chars with the lower bits, they
190 often use the immediately superior power of 2, which is 64, to address the
191 next line.
192
193 If you don't know what your LCD uses, in doubt let 16 here for a 2x16, and
194 64 here for a 2x40.
195
196config PANEL_LCD_CHARSET
197 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
198 int "LCD character set (0=normal, 1=KS0074)"
199 range 0 1
200 default 0
201 help
202 Some controllers such as the KS0074 use a somewhat strange character set
203 where many symbols are at unusual places. The driver knows how to map
204 'standard' ASCII characters to the character sets used by these controllers.
205 Valid values are :
206
207 0 : normal (untranslated) character set
208 1 : KS0074 character set
209
210 If you don't know, use the normal one (0).
211
212config PANEL_LCD_PROTO
213 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
214 int "LCD communication mode (0=parallel 8 bits, 1=serial)"
215 range 0 1
216 default 0
217 help
218 This driver now supports any serial or parallel LCD wired to a parallel
219 port. But before assigning signals, the driver needs to know if it will
220 be driving a serial LCD or a parallel one. Serial LCDs only use 2 wires
221 (SDA/SCL), while parallel ones use 2 or 3 wires for the control signals
222 (E, RS, sometimes RW), and 4 or 8 for the data. Use 0 here for a 8 bits
223 parallel LCD, and 1 for a serial LCD.
224
225config PANEL_LCD_PIN_E
226 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
227 int "Parallel port pin number & polarity connected to the LCD E signal (-17...17) "
228 range -17 17
229 default 14
230 help
231 This describes the number of the parallel port pin to which the LCD 'E'
232 signal has been connected. It can be :
233
234 0 : no connection (eg: connected to ground)
235 1..17 : directly connected to any of these pins on the DB25 plug
236 -1..-17 : connected to the same pin through an inverter (eg: transistor).
237
238 Default for the 'E' pin in custom profile is '14' (AUTOFEED).
239
240config PANEL_LCD_PIN_RS
241 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
242 int "Parallel port pin number & polarity connected to the LCD RS signal (-17...17) "
243 range -17 17
244 default 17
245 help
246 This describes the number of the parallel port pin to which the LCD 'RS'
247 signal has been connected. It can be :
248
249 0 : no connection (eg: connected to ground)
250 1..17 : directly connected to any of these pins on the DB25 plug
251 -1..-17 : connected to the same pin through an inverter (eg: transistor).
252
253 Default for the 'RS' pin in custom profile is '17' (SELECT IN).
254
255config PANEL_LCD_PIN_RW
256 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"
257 int "Parallel port pin number & polarity connected to the LCD RW signal (-17...17) "
258 range -17 17
259 default 16
260 help
261 This describes the number of the parallel port pin to which the LCD 'RW'
262 signal has been connected. It can be :
263
264 0 : no connection (eg: connected to ground)
265 1..17 : directly connected to any of these pins on the DB25 plug
266 -1..-17 : connected to the same pin through an inverter (eg: transistor).
267
268 Default for the 'RW' pin in custom profile is '16' (INIT).
269
270config PANEL_LCD_PIN_SCL
271 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
272 int "Parallel port pin number & polarity connected to the LCD SCL signal (-17...17) "
273 range -17 17
274 default 1
275 help
276 This describes the number of the parallel port pin to which the serial
277 LCD 'SCL' signal has been connected. It can be :
278
279 0 : no connection (eg: connected to ground)
280 1..17 : directly connected to any of these pins on the DB25 plug
281 -1..-17 : connected to the same pin through an inverter (eg: transistor).
282
283 Default for the 'SCL' pin in custom profile is '1' (STROBE).
284
285config PANEL_LCD_PIN_SDA
286 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"
287 int "Parallel port pin number & polarity connected to the LCD SDA signal (-17...17) "
288 range -17 17
289 default 2
290 help
291 This describes the number of the parallel port pin to which the serial
292 LCD 'SDA' signal has been connected. It can be :
293
294 0 : no connection (eg: connected to ground)
295 1..17 : directly connected to any of these pins on the DB25 plug
296 -1..-17 : connected to the same pin through an inverter (eg: transistor).
297
298 Default for the 'SDA' pin in custom profile is '2' (D0).
299
300config PANEL_LCD_PIN_BL
301 depends on PANEL_PROFILE="0" && PANEL_LCD="1"
302 int "Parallel port pin number & polarity connected to the LCD backlight signal (-17...17) "
303 range -17 17
304 default 0
305 help
306 This describes the number of the parallel port pin to which the LCD 'BL' signal
307 has been connected. It can be :
308
309 0 : no connection (eg: connected to ground)
310 1..17 : directly connected to any of these pins on the DB25 plug
311 -1..-17 : connected to the same pin through an inverter (eg: transistor).
312
313 Default for the 'BL' pin in custom profile is '0' (uncontrolled).
314
315endif # PARPORT_PANEL
316
317config PANEL_CHANGE_MESSAGE
318 bool "Change LCD initialization message ?"
319 depends on CHARLCD || LINEDISP
320 help
321 This allows you to replace the boot message indicating the kernel version
322 and the driver version with a custom message. This is useful on appliances
323 where a simple 'Starting system' message can be enough to stop a customer
324 from worrying.
325
326 If you say 'Y' here, you'll be able to choose a message yourself. Otherwise,
327 say 'N' and keep the default message with the version.
328
329config PANEL_BOOT_MESSAGE
330 depends on PANEL_CHANGE_MESSAGE="y"
331 string "New initialization message"
332 default ""
333 help
334 This allows you to replace the boot message indicating the kernel version
335 and the driver version with a custom message. This is useful on appliances
336 where a simple 'Starting system' message can be enough to stop a customer
337 from worrying.
338
339 An empty message will only clear the display at driver init time. Any other
340 printf()-formatted message is valid with newline and escape codes.
341
342choice
343 prompt "Backlight initial state"
344 default CHARLCD_BL_FLASH
345 help
346 Select the initial backlight state on boot or module load.
347
348 Previously, there was no option for this: the backlight flashed
349 briefly on init. Now you can also turn it off/on.
350
351 config CHARLCD_BL_OFF
352 bool "Off"
353 help
354 Backlight is initially turned off
355
356 config CHARLCD_BL_ON
357 bool "On"
358 help
359 Backlight is initially turned on
360
361 config CHARLCD_BL_FLASH
362 bool "Flash"
363 help
364 Backlight is flashed briefly on init
365
366endchoice
367
368#
369# Samsung KS0108 LCD controller section
370#
371config KS0108
372 tristate "KS0108 LCD Controller"
373 depends on PARPORT_PC
374 help
375 If you have a LCD controlled by one or more KS0108
376 controllers, say Y. You will need also another more specific
377 driver for your LCD.
378
379 Depends on Parallel Port support. If you say Y at
380 parport, you will be able to compile this as a module (M)
381 and built-in as well (Y).
382
383 To compile this as a module, choose M here:
384 the module will be called ks0108.
385
386 If unsure, say N.
387
388config KS0108_PORT
389 hex "Parallel port where the LCD is connected"
390 depends on KS0108
391 default 0x378
392 help
393 The address of the parallel port where the LCD is connected.
394
395 The first standard parallel port address is 0x378.
396 The second standard parallel port address is 0x278.
397 The third standard parallel port address is 0x3BC.
398
399 You can specify a different address if you need.
400
401 If you don't know what I'm talking about, load the parport module,
402 and execute "dmesg" or "cat /proc/ioports". You can see there how
403 many parallel ports are present and which address each one has.
404
405 Usually you only need to use 0x378.
406
407 If you compile this as a module, you can still override this
408 using the module parameters.
409
410config KS0108_DELAY
411 int "Delay between each control writing (microseconds)"
412 depends on KS0108
413 default "2"
414 help
415 Amount of time the ks0108 should wait between each control write
416 to the parallel port.
417
418 If your LCD seems to miss random writings, increment this.
419
420 If you don't know what I'm talking about, ignore it.
421
422 If you compile this as a module, you can still override this
423 value using the module parameters.
424
425config CFAG12864B
426 tristate "CFAG12864B LCD"
427 depends on X86
428 depends on FB
429 depends on KS0108
430 select FB_SYSMEM_HELPERS
431 help
432 If you have a Crystalfontz 128x64 2-color LCD, cfag12864b Series,
433 say Y. You also need the ks0108 LCD Controller driver.
434
435 For help about how to wire your LCD to the parallel port,
436 check Documentation/admin-guide/auxdisplay/cfag12864b.rst
437
438 Depends on the x86 arch and the framebuffer support.
439
440 The LCD framebuffer driver can be attached to a console.
441 It will work fine. However, you can't attach it to the fbdev driver
442 of the xorg server.
443
444 To compile this as a module, choose M here:
445 the modules will be called cfag12864b and cfag12864bfb.
446
447 If unsure, say N.
448
449config CFAG12864B_RATE
450 int "Refresh rate (hertz)"
451 depends on CFAG12864B
452 default "20"
453 help
454 Refresh rate of the LCD.
455
456 As the LCD is not memory mapped, the driver has to make the work by
457 software. This means you should be careful setting this value higher.
458 If your CPUs are really slow or you feel the system is slowed down,
459 decrease the value.
460
461 Be careful modifying this value to a very high value:
462 You can freeze the computer, or the LCD maybe can't draw as fast as you
463 are requesting.
464
465 If you don't know what I'm talking about, ignore it.
466
467 If you compile this as a module, you can still override this
468 value using the module parameters.
469
470#
471# Single character line display section
472#
473config LINEDISP
474 tristate "Character line display core support" if COMPILE_TEST
475 help
476 This is the core support for single-line character displays, to be
477 selected by drivers that use it.
478
479config IMG_ASCII_LCD
480 tristate "Imagination Technologies ASCII LCD Display"
481 depends on HAS_IOMEM
482 default y if MIPS_MALTA
483 select MFD_SYSCON
484 select LINEDISP
485 help
486 Enable this to support the simple ASCII LCD displays found on
487 development boards such as the MIPS Boston, MIPS Malta & MIPS SEAD3
488 from Imagination Technologies.
489
490config HT16K33
491 tristate "Holtek Ht16K33 LED controller with keyscan"
492 depends on FB && I2C && INPUT && BACKLIGHT_CLASS_DEVICE
493 select FB_SYSMEM_HELPERS
494 select INPUT_MATRIXKMAP
495 select FB_BACKLIGHT
496 select NEW_LEDS
497 select LEDS_CLASS
498 select LINEDISP
499 help
500 Say yes here to add support for Holtek HT16K33, RAM mapping 16*8
501 LED controller driver with keyscan.
502
503config MAX6959
504 tristate "Maxim MAX6958/6959 7-segment LED controller"
505 depends on I2C
506 select BITREVERSE
507 select REGMAP_I2C
508 select LINEDISP
509 help
510 If you say yes here you get support for the following Maxim chips
511 (I2C 7-segment LED display controller):
512 - MAX6958
513 - MAX6959 (input support)
514
515 This driver can also be built as a module. If so, the module
516 will be called max6959.
517
518config SEG_LED_GPIO
519 tristate "Generic 7-segment LED display"
520 depends on GPIOLIB || COMPILE_TEST
521 select LINEDISP
522 help
523 This driver supports a generic 7-segment LED display made up
524 of GPIO pins connected to the individual segments.
525
526 This driver can also be built as a module. If so, the module
527 will be called seg-led-gpio.
528
529#
530# Character LCD with non-conforming interface section
531#
532config ARM_CHARLCD
533 bool "ARM Ltd. Character LCD Driver"
534 depends on PLAT_VERSATILE
535 help
536 This is a driver for the character LCD found on the ARM Ltd.
537 Versatile and RealView Platform Baseboards. It doesn't do
538 very much more than display the text "ARM Linux" on the first
539 line and the Linux version on the second line, but that's
540 still useful.
541
542endif # AUXDISPLAY
543
544#
545# Deprecated options
546#
547config PANEL
548 tristate "Parallel port LCD/Keypad Panel support (OLD OPTION)"
549 depends on PARPORT
550 select AUXDISPLAY
551 select PARPORT_PANEL