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 REGMAP_I2C 507 select LINEDISP 508 help 509 If you say yes here you get support for the following Maxim chips 510 (I2C 7-segment LED display controller): 511 - MAX6958 512 - MAX6959 (input support) 513 514 This driver can also be built as a module. If so, the module 515 will be called max6959. 516 517config SEG_LED_GPIO 518 tristate "Generic 7-segment LED display" 519 depends on GPIOLIB || COMPILE_TEST 520 select LINEDISP 521 help 522 This driver supports a generic 7-segment LED display made up 523 of GPIO pins connected to the individual segments. 524 525 This driver can also be built as a module. If so, the module 526 will be called seg-led-gpio. 527 528# 529# Character LCD with non-conforming interface section 530# 531config ARM_CHARLCD 532 bool "ARM Ltd. Character LCD Driver" 533 depends on PLAT_VERSATILE 534 help 535 This is a driver for the character LCD found on the ARM Ltd. 536 Versatile and RealView Platform Baseboards. It doesn't do 537 very much more than display the text "ARM Linux" on the first 538 line and the Linux version on the second line, but that's 539 still useful. 540 541endif # AUXDISPLAY 542 543# 544# Deprecated options 545# 546config PANEL 547 tristate "Parallel port LCD/Keypad Panel support (OLD OPTION)" 548 depends on PARPORT 549 select AUXDISPLAY 550 select PARPORT_PANEL 551