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