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 17if AUXDISPLAY 18 19config HD44780 20 tristate "HD44780 Character LCD support" 21 depends on GPIOLIB || COMPILE_TEST 22 select CHARLCD 23 ---help--- 24 Enable support for Character LCDs using a HD44780 controller. 25 The LCD is accessible through the /dev/lcd char device (10, 156). 26 This code can either be compiled as a module, or linked into the 27 kernel and started at boot. 28 If you don't understand what all this is about, say N. 29 30config KS0108 31 tristate "KS0108 LCD Controller" 32 depends on PARPORT_PC 33 default n 34 ---help--- 35 If you have a LCD controlled by one or more KS0108 36 controllers, say Y. You will need also another more specific 37 driver for your LCD. 38 39 Depends on Parallel Port support. If you say Y at 40 parport, you will be able to compile this as a module (M) 41 and built-in as well (Y). 42 43 To compile this as a module, choose M here: 44 the module will be called ks0108. 45 46 If unsure, say N. 47 48config KS0108_PORT 49 hex "Parallel port where the LCD is connected" 50 depends on KS0108 51 default 0x378 52 ---help--- 53 The address of the parallel port where the LCD is connected. 54 55 The first standard parallel port address is 0x378. 56 The second standard parallel port address is 0x278. 57 The third standard parallel port address is 0x3BC. 58 59 You can specify a different address if you need. 60 61 If you don't know what I'm talking about, load the parport module, 62 and execute "dmesg" or "cat /proc/ioports". You can see there how 63 many parallel ports are present and which address each one has. 64 65 Usually you only need to use 0x378. 66 67 If you compile this as a module, you can still override this 68 using the module parameters. 69 70config KS0108_DELAY 71 int "Delay between each control writing (microseconds)" 72 depends on KS0108 73 default "2" 74 ---help--- 75 Amount of time the ks0108 should wait between each control write 76 to the parallel port. 77 78 If your LCD seems to miss random writings, increment this. 79 80 If you don't know what I'm talking about, ignore it. 81 82 If you compile this as a module, you can still override this 83 value using the module parameters. 84 85config CFAG12864B 86 tristate "CFAG12864B LCD" 87 depends on X86 88 depends on FB 89 depends on KS0108 90 select FB_SYS_FILLRECT 91 select FB_SYS_COPYAREA 92 select FB_SYS_IMAGEBLIT 93 select FB_SYS_FOPS 94 default n 95 ---help--- 96 If you have a Crystalfontz 128x64 2-color LCD, cfag12864b Series, 97 say Y. You also need the ks0108 LCD Controller driver. 98 99 For help about how to wire your LCD to the parallel port, 100 check Documentation/auxdisplay/cfag12864b 101 102 Depends on the x86 arch and the framebuffer support. 103 104 The LCD framebuffer driver can be attached to a console. 105 It will work fine. However, you can't attach it to the fbdev driver 106 of the xorg server. 107 108 To compile this as a module, choose M here: 109 the modules will be called cfag12864b and cfag12864bfb. 110 111 If unsure, say N. 112 113config CFAG12864B_RATE 114 int "Refresh rate (hertz)" 115 depends on CFAG12864B 116 default "20" 117 ---help--- 118 Refresh rate of the LCD. 119 120 As the LCD is not memory mapped, the driver has to make the work by 121 software. This means you should be careful setting this value higher. 122 If your CPUs are really slow or you feel the system is slowed down, 123 decrease the value. 124 125 Be careful modifying this value to a very high value: 126 You can freeze the computer, or the LCD maybe can't draw as fast as you 127 are requesting. 128 129 If you don't know what I'm talking about, ignore it. 130 131 If you compile this as a module, you can still override this 132 value using the module parameters. 133 134config IMG_ASCII_LCD 135 tristate "Imagination Technologies ASCII LCD Display" 136 depends on HAS_IOMEM 137 default y if MIPS_MALTA 138 select MFD_SYSCON 139 help 140 Enable this to support the simple ASCII LCD displays found on 141 development boards such as the MIPS Boston, MIPS Malta & MIPS SEAD3 142 from Imagination Technologies. 143 144config HT16K33 145 tristate "Holtek Ht16K33 LED controller with keyscan" 146 depends on FB && OF && I2C && INPUT 147 select FB_SYS_FOPS 148 select FB_SYS_FILLRECT 149 select FB_SYS_COPYAREA 150 select FB_SYS_IMAGEBLIT 151 select INPUT_MATRIXKMAP 152 select FB_BACKLIGHT 153 help 154 Say yes here to add support for Holtek HT16K33, RAM mapping 16*8 155 LED controller driver with keyscan. 156 157config ARM_CHARLCD 158 bool "ARM Ltd. Character LCD Driver" 159 depends on PLAT_VERSATILE 160 help 161 This is a driver for the character LCD found on the ARM Ltd. 162 Versatile and RealView Platform Baseboards. It doesn't do 163 very much more than display the text "ARM Linux" on the first 164 line and the Linux version on the second line, but that's 165 still useful. 166 167endif # AUXDISPLAY 168 169menuconfig PANEL 170 tristate "Parallel port LCD/Keypad Panel support" 171 depends on PARPORT 172 select CHARLCD 173 ---help--- 174 Say Y here if you have an HD44780 or KS-0074 LCD connected to your 175 parallel port. This driver also features 4 and 6-key keypads. The LCD 176 is accessible through the /dev/lcd char device (10, 156), and the 177 keypad through /dev/keypad (10, 185). This code can either be 178 compiled as a module, or linked into the kernel and started at boot. 179 If you don't understand what all this is about, say N. 180 181if PANEL 182 183config PANEL_PARPORT 184 int "Default parallel port number (0=LPT1)" 185 range 0 255 186 default "0" 187 ---help--- 188 This is the index of the parallel port the panel is connected to. One 189 driver instance only supports one parallel port, so if your keypad 190 and LCD are connected to two separate ports, you have to start two 191 modules with different arguments. Numbering starts with '0' for LPT1, 192 and so on. 193 194config PANEL_PROFILE 195 int "Default panel profile (0-5, 0=custom)" 196 range 0 5 197 default "5" 198 ---help--- 199 To ease configuration, the driver supports different configuration 200 profiles for past and recent wirings. These profiles can also be 201 used to define an approximative configuration, completed by a few 202 other options. Here are the profiles : 203 204 0 = custom (see further) 205 1 = 2x16 parallel LCD, old keypad 206 2 = 2x16 serial LCD (KS-0074), new keypad 207 3 = 2x16 parallel LCD (Hantronix), no keypad 208 4 = 2x16 parallel LCD (Nexcom NSA1045) with Nexcom's keypad 209 5 = 2x40 parallel LCD (old one), with old keypad 210 211 Custom configurations allow you to define how your display is 212 wired to the parallel port, and how it works. This is only intended 213 for experts. 214 215config PANEL_KEYPAD 216 depends on PANEL_PROFILE="0" 217 int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)" 218 range 0 3 219 default 0 220 ---help--- 221 This enables and configures a keypad connected to the parallel port. 222 The keys will be read from character device 10,185. Valid values are : 223 224 0 : do not enable this driver 225 1 : old 6 keys keypad 226 2 : new 6 keys keypad, as used on the server at www.ant-computing.com 227 3 : Nexcom NSA1045's 4 keys keypad 228 229 New profiles can be described in the driver source. The driver also 230 supports simultaneous keys pressed when the keypad supports them. 231 232config PANEL_LCD 233 depends on PANEL_PROFILE="0" 234 int "LCD type (0=none, 1=custom, 2=old //, 3=ks0074, 4=hantronix, 5=Nexcom)" 235 range 0 5 236 default 0 237 ---help--- 238 This enables and configures an LCD connected to the parallel port. 239 The driver includes an interpreter for escape codes starting with 240 '\e[L' which are specific to the LCD, and a few ANSI codes. The 241 driver will be registered as character device 10,156, usually 242 under the name '/dev/lcd'. There are a total of 6 supported types : 243 244 0 : do not enable the driver 245 1 : custom configuration and wiring (see further) 246 2 : 2x16 & 2x40 parallel LCD (old wiring) 247 3 : 2x16 serial LCD (KS-0074 based) 248 4 : 2x16 parallel LCD (Hantronix wiring) 249 5 : 2x16 parallel LCD (Nexcom wiring) 250 251 When type '1' is specified, other options will appear to configure 252 more precise aspects (wiring, dimensions, protocol, ...). Please note 253 that those values changed from the 2.4 driver for better consistency. 254 255config PANEL_LCD_HEIGHT 256 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 257 int "Number of lines on the LCD (1-2)" 258 range 1 2 259 default 2 260 ---help--- 261 This is the number of visible character lines on the LCD in custom profile. 262 It can either be 1 or 2. 263 264config PANEL_LCD_WIDTH 265 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 266 int "Number of characters per line on the LCD (1-40)" 267 range 1 40 268 default 40 269 ---help--- 270 This is the number of characters per line on the LCD in custom profile. 271 Common values are 16,20,24,40. 272 273config PANEL_LCD_BWIDTH 274 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 275 int "Internal LCD line width (1-40, 40 by default)" 276 range 1 40 277 default 40 278 ---help--- 279 Most LCDs use a standard controller which supports hardware lines of 40 280 characters, although sometimes only 16, 20 or 24 of them are really wired 281 to the terminal. This results in some non-visible but addressable characters, 282 and is the case for most parallel LCDs. Other LCDs, and some serial ones, 283 however, use the same line width internally as what is visible. The KS0074 284 for example, uses 16 characters per line for 16 visible characters per line. 285 286 This option lets you configure the value used by your LCD in 'custom' profile. 287 If you don't know, put '40' here. 288 289config PANEL_LCD_HWIDTH 290 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 291 int "Hardware LCD line width (1-64, 64 by default)" 292 range 1 64 293 default 64 294 ---help--- 295 Most LCDs use a single address bit to differentiate line 0 and line 1. Since 296 some of them need to be able to address 40 chars with the lower bits, they 297 often use the immediately superior power of 2, which is 64, to address the 298 next line. 299 300 If you don't know what your LCD uses, in doubt let 16 here for a 2x16, and 301 64 here for a 2x40. 302 303config PANEL_LCD_CHARSET 304 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 305 int "LCD character set (0=normal, 1=KS0074)" 306 range 0 1 307 default 0 308 ---help--- 309 Some controllers such as the KS0074 use a somewhat strange character set 310 where many symbols are at unusual places. The driver knows how to map 311 'standard' ASCII characters to the character sets used by these controllers. 312 Valid values are : 313 314 0 : normal (untranslated) character set 315 1 : KS0074 character set 316 317 If you don't know, use the normal one (0). 318 319config PANEL_LCD_PROTO 320 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 321 int "LCD communication mode (0=parallel 8 bits, 1=serial)" 322 range 0 1 323 default 0 324 ---help--- 325 This driver now supports any serial or parallel LCD wired to a parallel 326 port. But before assigning signals, the driver needs to know if it will 327 be driving a serial LCD or a parallel one. Serial LCDs only use 2 wires 328 (SDA/SCL), while parallel ones use 2 or 3 wires for the control signals 329 (E, RS, sometimes RW), and 4 or 8 for the data. Use 0 here for a 8 bits 330 parallel LCD, and 1 for a serial LCD. 331 332config PANEL_LCD_PIN_E 333 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0" 334 int "Parallel port pin number & polarity connected to the LCD E signal (-17...17) " 335 range -17 17 336 default 14 337 ---help--- 338 This describes the number of the parallel port pin to which the LCD 'E' 339 signal has been connected. It can be : 340 341 0 : no connection (eg: connected to ground) 342 1..17 : directly connected to any of these pins on the DB25 plug 343 -1..-17 : connected to the same pin through an inverter (eg: transistor). 344 345 Default for the 'E' pin in custom profile is '14' (AUTOFEED). 346 347config PANEL_LCD_PIN_RS 348 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0" 349 int "Parallel port pin number & polarity connected to the LCD RS signal (-17...17) " 350 range -17 17 351 default 17 352 ---help--- 353 This describes the number of the parallel port pin to which the LCD 'RS' 354 signal has been connected. It can be : 355 356 0 : no connection (eg: connected to ground) 357 1..17 : directly connected to any of these pins on the DB25 plug 358 -1..-17 : connected to the same pin through an inverter (eg: transistor). 359 360 Default for the 'RS' pin in custom profile is '17' (SELECT IN). 361 362config PANEL_LCD_PIN_RW 363 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0" 364 int "Parallel port pin number & polarity connected to the LCD RW signal (-17...17) " 365 range -17 17 366 default 16 367 ---help--- 368 This describes the number of the parallel port pin to which the LCD 'RW' 369 signal has been connected. It can be : 370 371 0 : no connection (eg: connected to ground) 372 1..17 : directly connected to any of these pins on the DB25 plug 373 -1..-17 : connected to the same pin through an inverter (eg: transistor). 374 375 Default for the 'RW' pin in custom profile is '16' (INIT). 376 377config PANEL_LCD_PIN_SCL 378 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0" 379 int "Parallel port pin number & polarity connected to the LCD SCL signal (-17...17) " 380 range -17 17 381 default 1 382 ---help--- 383 This describes the number of the parallel port pin to which the serial 384 LCD 'SCL' signal has been connected. It can be : 385 386 0 : no connection (eg: connected to ground) 387 1..17 : directly connected to any of these pins on the DB25 plug 388 -1..-17 : connected to the same pin through an inverter (eg: transistor). 389 390 Default for the 'SCL' pin in custom profile is '1' (STROBE). 391 392config PANEL_LCD_PIN_SDA 393 depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0" 394 int "Parallel port pin number & polarity connected to the LCD SDA signal (-17...17) " 395 range -17 17 396 default 2 397 ---help--- 398 This describes the number of the parallel port pin to which the serial 399 LCD 'SDA' signal has been connected. It can be : 400 401 0 : no connection (eg: connected to ground) 402 1..17 : directly connected to any of these pins on the DB25 plug 403 -1..-17 : connected to the same pin through an inverter (eg: transistor). 404 405 Default for the 'SDA' pin in custom profile is '2' (D0). 406 407config PANEL_LCD_PIN_BL 408 depends on PANEL_PROFILE="0" && PANEL_LCD="1" 409 int "Parallel port pin number & polarity connected to the LCD backlight signal (-17...17) " 410 range -17 17 411 default 0 412 ---help--- 413 This describes the number of the parallel port pin to which the LCD 'BL' signal 414 has been connected. It can be : 415 416 0 : no connection (eg: connected to ground) 417 1..17 : directly connected to any of these pins on the DB25 plug 418 -1..-17 : connected to the same pin through an inverter (eg: transistor). 419 420 Default for the 'BL' pin in custom profile is '0' (uncontrolled). 421 422config PANEL_CHANGE_MESSAGE 423 bool "Change LCD initialization message ?" 424 default "n" 425 ---help--- 426 This allows you to replace the boot message indicating the kernel version 427 and the driver version with a custom message. This is useful on appliances 428 where a simple 'Starting system' message can be enough to stop a customer 429 from worrying. 430 431 If you say 'Y' here, you'll be able to choose a message yourself. Otherwise, 432 say 'N' and keep the default message with the version. 433 434config PANEL_BOOT_MESSAGE 435 depends on PANEL_CHANGE_MESSAGE="y" 436 string "New initialization message" 437 default "" 438 ---help--- 439 This allows you to replace the boot message indicating the kernel version 440 and the driver version with a custom message. This is useful on appliances 441 where a simple 'Starting system' message can be enough to stop a customer 442 from worrying. 443 444 An empty message will only clear the display at driver init time. Any other 445 printf()-formatted message is valid with newline and escape codes. 446 447endif # PANEL 448 449config CHARLCD 450 tristate "Character LCD core support" if COMPILE_TEST 451