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.txt. 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 17config CHARLCD 18 tristate "Character LCD core support" if COMPILE_TEST 19 20if AUXDISPLAY 21 22config HD44780 23 tristate "HD44780 Character LCD support" 24 depends on GPIOLIB || COMPILE_TEST 25 select CHARLCD 26 ---help--- 27 Enable support for Character LCDs using a HD44780 controller. 28 The LCD is accessible through the /dev/lcd char device (10, 156). 29 This code can either be compiled as a module, or linked into the 30 kernel and started at boot. 31 If you don't understand what all this is about, say N. 32 33config KS0108 34 tristate "KS0108 LCD Controller" 35 depends on PARPORT_PC 36 default n 37 ---help--- 38 If you have a LCD controlled by one or more KS0108 39 controllers, say Y. You will need also another more specific 40 driver for your LCD. 41 42 Depends on Parallel Port support. If you say Y at 43 parport, you will be able to compile this as a module (M) 44 and built-in as well (Y). 45 46 To compile this as a module, choose M here: 47 the module will be called ks0108. 48 49 If unsure, say N. 50 51config KS0108_PORT 52 hex "Parallel port where the LCD is connected" 53 depends on KS0108 54 default 0x378 55 ---help--- 56 The address of the parallel port where the LCD is connected. 57 58 The first standard parallel port address is 0x378. 59 The second standard parallel port address is 0x278. 60 The third standard parallel port address is 0x3BC. 61 62 You can specify a different address if you need. 63 64 If you don't know what I'm talking about, load the parport module, 65 and execute "dmesg" or "cat /proc/ioports". You can see there how 66 many parallel ports are present and which address each one has. 67 68 Usually you only need to use 0x378. 69 70 If you compile this as a module, you can still override this 71 using the module parameters. 72 73config KS0108_DELAY 74 int "Delay between each control writing (microseconds)" 75 depends on KS0108 76 default "2" 77 ---help--- 78 Amount of time the ks0108 should wait between each control write 79 to the parallel port. 80 81 If your LCD seems to miss random writings, increment this. 82 83 If you don't know what I'm talking about, ignore it. 84 85 If you compile this as a module, you can still override this 86 value using the module parameters. 87 88config CFAG12864B 89 tristate "CFAG12864B LCD" 90 depends on X86 91 depends on FB 92 depends on KS0108 93 select FB_SYS_FILLRECT 94 select FB_SYS_COPYAREA 95 select FB_SYS_IMAGEBLIT 96 select FB_SYS_FOPS 97 default n 98 ---help--- 99 If you have a Crystalfontz 128x64 2-color LCD, cfag12864b Series, 100 say Y. You also need the ks0108 LCD Controller driver. 101 102 For help about how to wire your LCD to the parallel port, 103 check Documentation/auxdisplay/cfag12864b 104 105 Depends on the x86 arch and the framebuffer support. 106 107 The LCD framebuffer driver can be attached to a console. 108 It will work fine. However, you can't attach it to the fbdev driver 109 of the xorg server. 110 111 To compile this as a module, choose M here: 112 the modules will be called cfag12864b and cfag12864bfb. 113 114 If unsure, say N. 115 116config CFAG12864B_RATE 117 int "Refresh rate (hertz)" 118 depends on CFAG12864B 119 default "20" 120 ---help--- 121 Refresh rate of the LCD. 122 123 As the LCD is not memory mapped, the driver has to make the work by 124 software. This means you should be careful setting this value higher. 125 If your CPUs are really slow or you feel the system is slowed down, 126 decrease the value. 127 128 Be careful modifying this value to a very high value: 129 You can freeze the computer, or the LCD maybe can't draw as fast as you 130 are requesting. 131 132 If you don't know what I'm talking about, ignore it. 133 134 If you compile this as a module, you can still override this 135 value using the module parameters. 136 137config IMG_ASCII_LCD 138 tristate "Imagination Technologies ASCII LCD Display" 139 default y if MIPS_MALTA || MIPS_SEAD3 140 select SYSCON 141 help 142 Enable this to support the simple ASCII LCD displays found on 143 development boards such as the MIPS Boston, MIPS Malta & MIPS SEAD3 144 from Imagination Technologies. 145 146config HT16K33 147 tristate "Holtek Ht16K33 LED controller with keyscan" 148 depends on FB && OF && I2C && INPUT 149 select FB_SYS_FOPS 150 select FB_SYS_FILLRECT 151 select FB_SYS_COPYAREA 152 select FB_SYS_IMAGEBLIT 153 select INPUT_MATRIXKMAP 154 select FB_BACKLIGHT 155 help 156 Say yes here to add support for Holtek HT16K33, RAM mapping 16*8 157 LED controller driver with keyscan. 158 159endif # AUXDISPLAY 160 161config ARM_CHARLCD 162 bool "ARM Ltd. Character LCD Driver" 163 depends on PLAT_VERSATILE 164 help 165 This is a driver for the character LCD found on the ARM Ltd. 166 Versatile and RealView Platform Baseboards. It doesn't do 167 very much more than display the text "ARM Linux" on the first 168 line and the Linux version on the second line, but that's 169 still useful. 170 171config PANEL 172 tristate "Parallel port LCD/Keypad Panel support" 173 depends on PARPORT 174 select CHARLCD 175 ---help--- 176 Say Y here if you have an HD44780 or KS-0074 LCD connected to your 177 parallel port. This driver also features 4 and 6-key keypads. The LCD 178 is accessible through the /dev/lcd char device (10, 156), and the 179 keypad through /dev/keypad (10, 185). This code can either be 180 compiled as a module, or linked into the kernel and started at boot. 181 If you don't understand what all this is about, say N. 182 183if PANEL 184 185config PANEL_PARPORT 186 int "Default parallel port number (0=LPT1)" 187 range 0 255 188 default "0" 189 ---help--- 190 This is the index of the parallel port the panel is connected to. One 191 driver instance only supports one parallel port, so if your keypad 192 and LCD are connected to two separate ports, you have to start two 193 modules with different arguments. Numbering starts with '0' for LPT1, 194 and so on. 195 196config PANEL_PROFILE 197 int "Default panel profile (0-5, 0=custom)" 198 range 0 5 199 default "5" 200 ---help--- 201 To ease configuration, the driver supports different configuration 202 profiles for past and recent wirings. These profiles can also be 203 used to define an approximative configuration, completed by a few 204 other options. Here are the profiles : 205 206 0 = custom (see further) 207 1 = 2x16 parallel LCD, old keypad 208 2 = 2x16 serial LCD (KS-0074), new keypad 209 3 = 2x16 parallel LCD (Hantronix), no keypad 210 4 = 2x16 parallel LCD (Nexcom NSA1045) with Nexcom's keypad 211 5 = 2x40 parallel LCD (old one), with old keypad 212 213 Custom configurations allow you to define how your display is 214 wired to the parallel port, and how it works. This is only intended 215 for experts. 216 217config PANEL_KEYPAD 218 depends on PANEL_PROFILE="0" 219 int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)" 220 range 0 3 221 default 0 222 ---help--- 223 This enables and configures a keypad connected to the parallel port. 224 The keys will be read from character device 10,185. Valid values are : 225 226 0 : do not enable this driver 227 1 : old 6 keys keypad 228 2 : new 6 keys keypad, as used on the server at www.ant-computing.com 229 3 : Nexcom NSA1045's 4 keys keypad 230 231 New profiles can be described in the driver source. The driver also 232 supports simultaneous keys pressed when the keypad supports them. 233 234config PANEL_LCD 235 depends on PANEL_PROFILE="0" 236 int "LCD type (0=none, 1=custom, 2=old //, 3=ks0074, 4=hantronix, 5=Nexcom)" 237 range 0 5 238 default 0 239 ---help--- 240 This enables and configures an LCD connected to the parallel port. 241 The driver includes an interpreter for escape codes starting with 242 '\e[L' which are specific to the LCD, and a few ANSI codes. The 243 driver will be registered as character device 10,156, usually 244 under the name '/dev/lcd'. There are a total of 6 supported types : 245 246 0 : do not enable the driver 247 1 : custom configuration and wiring (see further) 248 2 : 2x16 & 2x40 parallel LCD (old wiring) 249 3 : 2x16 serial LCD (KS-0074 based) 250 4 : 2x16 parallel LCD (Hantronix wiring) 251 5 : 2x16 parallel LCD (Nexcom wiring) 252 253 When type '1' is specified, other options will appear to configure 254 more precise aspects (wiring, dimensions, protocol, ...). Please note 255 that those values changed from the 2.4 driver for better consistency. 256 257config PANEL_LCD_HEIGHT 258 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 259 int "Number of lines on the LCD (1-2)" 260 range 1 2 261 default 2 262 ---help--- 263 This is the number of visible character lines on the LCD in custom profile. 264 It can either be 1 or 2. 265 266config PANEL_LCD_WIDTH 267 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 268 int "Number of characters per line on the LCD (1-40)" 269 range 1 40 270 default 40 271 ---help--- 272 This is the number of characters per line on the LCD in custom profile. 273 Common values are 16,20,24,40. 274 275config PANEL_LCD_BWIDTH 276 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 277 int "Internal LCD line width (1-40, 40 by default)" 278 range 1 40 279 default 40 280 ---help--- 281 Most LCDs use a standard controller which supports hardware lines of 40 282 characters, although sometimes only 16, 20 or 24 of them are really wired 283 to the terminal. This results in some non-visible but addressable characters, 284 and is the case for most parallel LCDs. Other LCDs, and some serial ones, 285 however, use the same line width internally as what is visible. The KS0074 286 for example, uses 16 characters per line for 16 visible characters per line. 287 288 This option lets you configure the value used by your LCD in 'custom' profile. 289 If you don't know, put '40' here. 290 291config PANEL_LCD_HWIDTH 292 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 293 int "Hardware LCD line width (1-64, 64 by default)" 294 range 1 64 295 default 64 296 ---help--- 297 Most LCDs use a single address bit to differentiate line 0 and line 1. Since 298 some of them need to be able to address 40 chars with the lower bits, they 299 often use the immediately superior power of 2, which is 64, to address the 300 next line. 301 302 If you don't know what your LCD uses, in doubt let 16 here for a 2x16, and 303 64 here for a 2x40. 304 305config PANEL_LCD_CHARSET 306 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 307 int "LCD character set (0=normal, 1=KS0074)" 308 range 0 1 309 default 0 310 ---help--- 311 Some controllers such as the KS0074 use a somewhat strange character set 312 where many symbols are at unusual places. The driver knows how to map 313 'standard' ASCII characters to the character sets used by these controllers. 314 Valid values are : 315 316 0 : normal (untranslated) character set 317 1 : KS0074 character set 318 319 If you don't know, use the normal one (0). 320 321config PANEL_LCD_PROTO 322 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 323 int "LCD communication mode (0=parallel 8 bits, 1=serial)" 324 range 0 1 325 default 0 326 ---help--- 327 This driver now supports any serial or parallel LCD wired to a parallel 328 port. But before assigning signals, the driver needs to know if it will 329 be driving a serial LCD or a parallel one. Serial LCDs only use 2 wires 330 (SDA/SCL), while parallel ones use 2 or 3 wires for the control signals 331 (E, RS, sometimes RW), and 4 or 8 for the data. Use 0 here for a 8 bits 332 parallel LCD, and 1 for a serial LCD. 333 334config PANEL_LCD_PIN_E 335 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0" 336 int "Parallel port pin number & polarity connected to the LCD E signal (-17...17) " 337 range -17 17 338 default 14 339 ---help--- 340 This describes the number of the parallel port pin to which the LCD 'E' 341 signal has been connected. It can be : 342 343 0 : no connection (eg: connected to ground) 344 1..17 : directly connected to any of these pins on the DB25 plug 345 -1..-17 : connected to the same pin through an inverter (eg: transistor). 346 347 Default for the 'E' pin in custom profile is '14' (AUTOFEED). 348 349config PANEL_LCD_PIN_RS 350 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0" 351 int "Parallel port pin number & polarity connected to the LCD RS signal (-17...17) " 352 range -17 17 353 default 17 354 ---help--- 355 This describes the number of the parallel port pin to which the LCD 'RS' 356 signal has been connected. It can be : 357 358 0 : no connection (eg: connected to ground) 359 1..17 : directly connected to any of these pins on the DB25 plug 360 -1..-17 : connected to the same pin through an inverter (eg: transistor). 361 362 Default for the 'RS' pin in custom profile is '17' (SELECT IN). 363 364config PANEL_LCD_PIN_RW 365 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0" 366 int "Parallel port pin number & polarity connected to the LCD RW signal (-17...17) " 367 range -17 17 368 default 16 369 ---help--- 370 This describes the number of the parallel port pin to which the LCD 'RW' 371 signal has been connected. It can be : 372 373 0 : no connection (eg: connected to ground) 374 1..17 : directly connected to any of these pins on the DB25 plug 375 -1..-17 : connected to the same pin through an inverter (eg: transistor). 376 377 Default for the 'RW' pin in custom profile is '16' (INIT). 378 379config PANEL_LCD_PIN_SCL 380 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0" 381 int "Parallel port pin number & polarity connected to the LCD SCL signal (-17...17) " 382 range -17 17 383 default 1 384 ---help--- 385 This describes the number of the parallel port pin to which the serial 386 LCD 'SCL' signal has been connected. It can be : 387 388 0 : no connection (eg: connected to ground) 389 1..17 : directly connected to any of these pins on the DB25 plug 390 -1..-17 : connected to the same pin through an inverter (eg: transistor). 391 392 Default for the 'SCL' pin in custom profile is '1' (STROBE). 393 394config PANEL_LCD_PIN_SDA 395 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0" 396 int "Parallel port pin number & polarity connected to the LCD SDA signal (-17...17) " 397 range -17 17 398 default 2 399 ---help--- 400 This describes the number of the parallel port pin to which the serial 401 LCD 'SDA' signal has been connected. It can be : 402 403 0 : no connection (eg: connected to ground) 404 1..17 : directly connected to any of these pins on the DB25 plug 405 -1..-17 : connected to the same pin through an inverter (eg: transistor). 406 407 Default for the 'SDA' pin in custom profile is '2' (D0). 408 409config PANEL_LCD_PIN_BL 410 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 411 int "Parallel port pin number & polarity connected to the LCD backlight signal (-17...17) " 412 range -17 17 413 default 0 414 ---help--- 415 This describes the number of the parallel port pin to which the LCD 'BL' signal 416 has been connected. It can be : 417 418 0 : no connection (eg: connected to ground) 419 1..17 : directly connected to any of these pins on the DB25 plug 420 -1..-17 : connected to the same pin through an inverter (eg: transistor). 421 422 Default for the 'BL' pin in custom profile is '0' (uncontrolled). 423 424config PANEL_CHANGE_MESSAGE 425 bool "Change LCD initialization message ?" 426 default "n" 427 ---help--- 428 This allows you to replace the boot message indicating the kernel version 429 and the driver version with a custom message. This is useful on appliances 430 where a simple 'Starting system' message can be enough to stop a customer 431 from worrying. 432 433 If you say 'Y' here, you'll be able to choose a message yourself. Otherwise, 434 say 'N' and keep the default message with the version. 435 436config PANEL_BOOT_MESSAGE 437 depends on PANEL_CHANGE_MESSAGE="y" 438 string "New initialization message" 439 default "" 440 ---help--- 441 This allows you to replace the boot message indicating the kernel version 442 and the driver version with a custom message. This is useful on appliances 443 where a simple 'Starting system' message can be enough to stop a customer 444 from worrying. 445 446 An empty message will only clear the display at driver init time. Any other 447 printf()-formatted message is valid with newline and escape codes. 448 449endif # PANEL 450