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 depends on HAS_IOMEM 140 default y if MIPS_MALTA || MIPS_SEAD3 141 select SYSCON 142 help 143 Enable this to support the simple ASCII LCD displays found on 144 development boards such as the MIPS Boston, MIPS Malta & MIPS SEAD3 145 from Imagination Technologies. 146 147config HT16K33 148 tristate "Holtek Ht16K33 LED controller with keyscan" 149 depends on FB && OF && I2C && INPUT 150 select FB_SYS_FOPS 151 select FB_SYS_FILLRECT 152 select FB_SYS_COPYAREA 153 select FB_SYS_IMAGEBLIT 154 select INPUT_MATRIXKMAP 155 select FB_BACKLIGHT 156 help 157 Say yes here to add support for Holtek HT16K33, RAM mapping 16*8 158 LED controller driver with keyscan. 159 160endif # AUXDISPLAY 161 162config ARM_CHARLCD 163 bool "ARM Ltd. Character LCD Driver" 164 depends on PLAT_VERSATILE 165 help 166 This is a driver for the character LCD found on the ARM Ltd. 167 Versatile and RealView Platform Baseboards. It doesn't do 168 very much more than display the text "ARM Linux" on the first 169 line and the Linux version on the second line, but that's 170 still useful. 171 172config PANEL 173 tristate "Parallel port LCD/Keypad Panel support" 174 depends on PARPORT 175 select CHARLCD 176 ---help--- 177 Say Y here if you have an HD44780 or KS-0074 LCD connected to your 178 parallel port. This driver also features 4 and 6-key keypads. The LCD 179 is accessible through the /dev/lcd char device (10, 156), and the 180 keypad through /dev/keypad (10, 185). This code can either be 181 compiled as a module, or linked into the kernel and started at boot. 182 If you don't understand what all this is about, say N. 183 184if PANEL 185 186config PANEL_PARPORT 187 int "Default parallel port number (0=LPT1)" 188 range 0 255 189 default "0" 190 ---help--- 191 This is the index of the parallel port the panel is connected to. One 192 driver instance only supports one parallel port, so if your keypad 193 and LCD are connected to two separate ports, you have to start two 194 modules with different arguments. Numbering starts with '0' for LPT1, 195 and so on. 196 197config PANEL_PROFILE 198 int "Default panel profile (0-5, 0=custom)" 199 range 0 5 200 default "5" 201 ---help--- 202 To ease configuration, the driver supports different configuration 203 profiles for past and recent wirings. These profiles can also be 204 used to define an approximative configuration, completed by a few 205 other options. Here are the profiles : 206 207 0 = custom (see further) 208 1 = 2x16 parallel LCD, old keypad 209 2 = 2x16 serial LCD (KS-0074), new keypad 210 3 = 2x16 parallel LCD (Hantronix), no keypad 211 4 = 2x16 parallel LCD (Nexcom NSA1045) with Nexcom's keypad 212 5 = 2x40 parallel LCD (old one), with old keypad 213 214 Custom configurations allow you to define how your display is 215 wired to the parallel port, and how it works. This is only intended 216 for experts. 217 218config PANEL_KEYPAD 219 depends on PANEL_PROFILE="0" 220 int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)" 221 range 0 3 222 default 0 223 ---help--- 224 This enables and configures a keypad connected to the parallel port. 225 The keys will be read from character device 10,185. Valid values are : 226 227 0 : do not enable this driver 228 1 : old 6 keys keypad 229 2 : new 6 keys keypad, as used on the server at www.ant-computing.com 230 3 : Nexcom NSA1045's 4 keys keypad 231 232 New profiles can be described in the driver source. The driver also 233 supports simultaneous keys pressed when the keypad supports them. 234 235config PANEL_LCD 236 depends on PANEL_PROFILE="0" 237 int "LCD type (0=none, 1=custom, 2=old //, 3=ks0074, 4=hantronix, 5=Nexcom)" 238 range 0 5 239 default 0 240 ---help--- 241 This enables and configures an LCD connected to the parallel port. 242 The driver includes an interpreter for escape codes starting with 243 '\e[L' which are specific to the LCD, and a few ANSI codes. The 244 driver will be registered as character device 10,156, usually 245 under the name '/dev/lcd'. There are a total of 6 supported types : 246 247 0 : do not enable the driver 248 1 : custom configuration and wiring (see further) 249 2 : 2x16 & 2x40 parallel LCD (old wiring) 250 3 : 2x16 serial LCD (KS-0074 based) 251 4 : 2x16 parallel LCD (Hantronix wiring) 252 5 : 2x16 parallel LCD (Nexcom wiring) 253 254 When type '1' is specified, other options will appear to configure 255 more precise aspects (wiring, dimensions, protocol, ...). Please note 256 that those values changed from the 2.4 driver for better consistency. 257 258config PANEL_LCD_HEIGHT 259 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 260 int "Number of lines on the LCD (1-2)" 261 range 1 2 262 default 2 263 ---help--- 264 This is the number of visible character lines on the LCD in custom profile. 265 It can either be 1 or 2. 266 267config PANEL_LCD_WIDTH 268 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 269 int "Number of characters per line on the LCD (1-40)" 270 range 1 40 271 default 40 272 ---help--- 273 This is the number of characters per line on the LCD in custom profile. 274 Common values are 16,20,24,40. 275 276config PANEL_LCD_BWIDTH 277 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 278 int "Internal LCD line width (1-40, 40 by default)" 279 range 1 40 280 default 40 281 ---help--- 282 Most LCDs use a standard controller which supports hardware lines of 40 283 characters, although sometimes only 16, 20 or 24 of them are really wired 284 to the terminal. This results in some non-visible but addressable characters, 285 and is the case for most parallel LCDs. Other LCDs, and some serial ones, 286 however, use the same line width internally as what is visible. The KS0074 287 for example, uses 16 characters per line for 16 visible characters per line. 288 289 This option lets you configure the value used by your LCD in 'custom' profile. 290 If you don't know, put '40' here. 291 292config PANEL_LCD_HWIDTH 293 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 294 int "Hardware LCD line width (1-64, 64 by default)" 295 range 1 64 296 default 64 297 ---help--- 298 Most LCDs use a single address bit to differentiate line 0 and line 1. Since 299 some of them need to be able to address 40 chars with the lower bits, they 300 often use the immediately superior power of 2, which is 64, to address the 301 next line. 302 303 If you don't know what your LCD uses, in doubt let 16 here for a 2x16, and 304 64 here for a 2x40. 305 306config PANEL_LCD_CHARSET 307 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 308 int "LCD character set (0=normal, 1=KS0074)" 309 range 0 1 310 default 0 311 ---help--- 312 Some controllers such as the KS0074 use a somewhat strange character set 313 where many symbols are at unusual places. The driver knows how to map 314 'standard' ASCII characters to the character sets used by these controllers. 315 Valid values are : 316 317 0 : normal (untranslated) character set 318 1 : KS0074 character set 319 320 If you don't know, use the normal one (0). 321 322config PANEL_LCD_PROTO 323 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 324 int "LCD communication mode (0=parallel 8 bits, 1=serial)" 325 range 0 1 326 default 0 327 ---help--- 328 This driver now supports any serial or parallel LCD wired to a parallel 329 port. But before assigning signals, the driver needs to know if it will 330 be driving a serial LCD or a parallel one. Serial LCDs only use 2 wires 331 (SDA/SCL), while parallel ones use 2 or 3 wires for the control signals 332 (E, RS, sometimes RW), and 4 or 8 for the data. Use 0 here for a 8 bits 333 parallel LCD, and 1 for a serial LCD. 334 335config PANEL_LCD_PIN_E 336 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0" 337 int "Parallel port pin number & polarity connected to the LCD E signal (-17...17) " 338 range -17 17 339 default 14 340 ---help--- 341 This describes the number of the parallel port pin to which the LCD 'E' 342 signal has been connected. It can be : 343 344 0 : no connection (eg: connected to ground) 345 1..17 : directly connected to any of these pins on the DB25 plug 346 -1..-17 : connected to the same pin through an inverter (eg: transistor). 347 348 Default for the 'E' pin in custom profile is '14' (AUTOFEED). 349 350config PANEL_LCD_PIN_RS 351 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0" 352 int "Parallel port pin number & polarity connected to the LCD RS signal (-17...17) " 353 range -17 17 354 default 17 355 ---help--- 356 This describes the number of the parallel port pin to which the LCD 'RS' 357 signal has been connected. It can be : 358 359 0 : no connection (eg: connected to ground) 360 1..17 : directly connected to any of these pins on the DB25 plug 361 -1..-17 : connected to the same pin through an inverter (eg: transistor). 362 363 Default for the 'RS' pin in custom profile is '17' (SELECT IN). 364 365config PANEL_LCD_PIN_RW 366 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0" 367 int "Parallel port pin number & polarity connected to the LCD RW signal (-17...17) " 368 range -17 17 369 default 16 370 ---help--- 371 This describes the number of the parallel port pin to which the LCD 'RW' 372 signal has been connected. It can be : 373 374 0 : no connection (eg: connected to ground) 375 1..17 : directly connected to any of these pins on the DB25 plug 376 -1..-17 : connected to the same pin through an inverter (eg: transistor). 377 378 Default for the 'RW' pin in custom profile is '16' (INIT). 379 380config PANEL_LCD_PIN_SCL 381 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0" 382 int "Parallel port pin number & polarity connected to the LCD SCL signal (-17...17) " 383 range -17 17 384 default 1 385 ---help--- 386 This describes the number of the parallel port pin to which the serial 387 LCD 'SCL' signal has been connected. It can be : 388 389 0 : no connection (eg: connected to ground) 390 1..17 : directly connected to any of these pins on the DB25 plug 391 -1..-17 : connected to the same pin through an inverter (eg: transistor). 392 393 Default for the 'SCL' pin in custom profile is '1' (STROBE). 394 395config PANEL_LCD_PIN_SDA 396 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0" 397 int "Parallel port pin number & polarity connected to the LCD SDA signal (-17...17) " 398 range -17 17 399 default 2 400 ---help--- 401 This describes the number of the parallel port pin to which the serial 402 LCD 'SDA' signal has been connected. It can be : 403 404 0 : no connection (eg: connected to ground) 405 1..17 : directly connected to any of these pins on the DB25 plug 406 -1..-17 : connected to the same pin through an inverter (eg: transistor). 407 408 Default for the 'SDA' pin in custom profile is '2' (D0). 409 410config PANEL_LCD_PIN_BL 411 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 412 int "Parallel port pin number & polarity connected to the LCD backlight signal (-17...17) " 413 range -17 17 414 default 0 415 ---help--- 416 This describes the number of the parallel port pin to which the LCD 'BL' signal 417 has been connected. It can be : 418 419 0 : no connection (eg: connected to ground) 420 1..17 : directly connected to any of these pins on the DB25 plug 421 -1..-17 : connected to the same pin through an inverter (eg: transistor). 422 423 Default for the 'BL' pin in custom profile is '0' (uncontrolled). 424 425config PANEL_CHANGE_MESSAGE 426 bool "Change LCD initialization message ?" 427 default "n" 428 ---help--- 429 This allows you to replace the boot message indicating the kernel version 430 and the driver version with a custom message. This is useful on appliances 431 where a simple 'Starting system' message can be enough to stop a customer 432 from worrying. 433 434 If you say 'Y' here, you'll be able to choose a message yourself. Otherwise, 435 say 'N' and keep the default message with the version. 436 437config PANEL_BOOT_MESSAGE 438 depends on PANEL_CHANGE_MESSAGE="y" 439 string "New initialization message" 440 default "" 441 ---help--- 442 This allows you to replace the boot message indicating the kernel version 443 and the driver version with a custom message. This is useful on appliances 444 where a simple 'Starting system' message can be enough to stop a customer 445 from worrying. 446 447 An empty message will only clear the display at driver init time. Any other 448 printf()-formatted message is valid with newline and escape codes. 449 450endif # PANEL 451