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