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1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */2/*3 * Copyright (c) 2005 Henk Vergonet <Henk.Vergonet@gmail.com>4 */5 6#ifndef MAP_TO_7SEGMENT_H7#define MAP_TO_7SEGMENT_H8 9/* This file provides translation primitives and tables for the conversion10 * of (ASCII) characters to a 7-segments notation.11 *12 * The 7 segment's wikipedia notation below is used as standard.13 * See: https://en.wikipedia.org/wiki/Seven_segment_display14 *15 * Notation: +-a-+16 * f b17 * +-g-+18 * e c19 * +-d-+20 *21 * Usage:22 *23 * Register a map variable, and fill it with a character set:24 * static SEG7_DEFAULT_MAP(map_seg7);25 *26 *27 * Then use for conversion:28 * seg7 = map_to_seg7(&map_seg7, some_char);29 * ...30 *31 * In device drivers it is recommended, if required, to make the char map32 * accessible via the sysfs interface using the following scheme:33 *34 * static ssize_t map_seg7_show(struct device *dev,35 * struct device_attribute *attr, char *buf)36 * {37 * memcpy(buf, &map_seg7, sizeof(map_seg7));38 * return sizeof(map_seg7);39 * }40 * static ssize_t map_seg7_store(struct device *dev,41 * struct device_attribute *attr, const char *buf,42 * size_t cnt)43 * {44 * if(cnt != sizeof(map_seg7))45 * return -EINVAL;46 * memcpy(&map_seg7, buf, cnt);47 * return cnt;48 * }49 * static DEVICE_ATTR_RW(map_seg7);50 *51 * History:52 * 2005-05-31 RFC linux-kernel@vger.kernel.org53 */54#include <linux/errno.h>55 56 57#define BIT_SEG7_A 058#define BIT_SEG7_B 159#define BIT_SEG7_C 260#define BIT_SEG7_D 361#define BIT_SEG7_E 462#define BIT_SEG7_F 563#define BIT_SEG7_G 664#define BIT_SEG7_RESERVED 765 66struct seg7_conversion_map {67 unsigned char table[128];68};69 70static __inline__ int map_to_seg7(struct seg7_conversion_map *map, int c)71{72 return c >= 0 && c < sizeof(map->table) ? map->table[c] : -EINVAL;73}74 75#define SEG7_CONVERSION_MAP(_name, _map) \76 struct seg7_conversion_map _name = { .table = { _map } }77 78/*79 * It is recommended to use a facility that allows user space to redefine80 * custom character sets for LCD devices. Please use a sysfs interface81 * as described above.82 */83#define MAP_TO_SEG7_SYSFS_FILE "map_seg7"84 85/*******************************************************************************86 * ASCII conversion table87 ******************************************************************************/88 89#define _SEG7(l,a,b,c,d,e,f,g) \90 ( a<<BIT_SEG7_A | b<<BIT_SEG7_B | c<<BIT_SEG7_C | d<<BIT_SEG7_D | \91 e<<BIT_SEG7_E | f<<BIT_SEG7_F | g<<BIT_SEG7_G )92 93#define _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \94 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,95 96#define _MAP_33_47_ASCII_SEG7_SYMBOL \97 _SEG7('!',0,0,0,0,1,1,0), _SEG7('"',0,1,0,0,0,1,0), _SEG7('#',0,1,1,0,1,1,0),\98 _SEG7('$',1,0,1,1,0,1,1), _SEG7('%',0,0,1,0,0,1,0), _SEG7('&',1,0,1,1,1,1,1),\99 _SEG7('\'',0,0,0,0,0,1,0),_SEG7('(',1,0,0,1,1,1,0), _SEG7(')',1,1,1,1,0,0,0),\100 _SEG7('*',0,1,1,0,1,1,1), _SEG7('+',0,1,1,0,0,0,1), _SEG7(',',0,0,0,0,1,0,0),\101 _SEG7('-',0,0,0,0,0,0,1), _SEG7('.',0,0,0,0,1,0,0), _SEG7('/',0,1,0,0,1,0,1),102 103#define _MAP_48_57_ASCII_SEG7_NUMERIC \104 _SEG7('0',1,1,1,1,1,1,0), _SEG7('1',0,1,1,0,0,0,0), _SEG7('2',1,1,0,1,1,0,1),\105 _SEG7('3',1,1,1,1,0,0,1), _SEG7('4',0,1,1,0,0,1,1), _SEG7('5',1,0,1,1,0,1,1),\106 _SEG7('6',1,0,1,1,1,1,1), _SEG7('7',1,1,1,0,0,0,0), _SEG7('8',1,1,1,1,1,1,1),\107 _SEG7('9',1,1,1,1,0,1,1),108 109#define _MAP_58_64_ASCII_SEG7_SYMBOL \110 _SEG7(':',0,0,0,1,0,0,1), _SEG7(';',0,0,0,1,0,0,1), _SEG7('<',1,0,0,0,0,1,1),\111 _SEG7('=',0,0,0,1,0,0,1), _SEG7('>',1,1,0,0,0,0,1), _SEG7('?',1,1,1,0,0,1,0),\112 _SEG7('@',1,1,0,1,1,1,1),113 114#define _MAP_65_90_ASCII_SEG7_ALPHA_UPPR \115 _SEG7('A',1,1,1,0,1,1,1), _SEG7('B',1,1,1,1,1,1,1), _SEG7('C',1,0,0,1,1,1,0),\116 _SEG7('D',1,1,1,1,1,1,0), _SEG7('E',1,0,0,1,1,1,1), _SEG7('F',1,0,0,0,1,1,1),\117 _SEG7('G',1,1,1,1,0,1,1), _SEG7('H',0,1,1,0,1,1,1), _SEG7('I',0,1,1,0,0,0,0),\118 _SEG7('J',0,1,1,1,0,0,0), _SEG7('K',0,1,1,0,1,1,1), _SEG7('L',0,0,0,1,1,1,0),\119 _SEG7('M',1,1,1,0,1,1,0), _SEG7('N',1,1,1,0,1,1,0), _SEG7('O',1,1,1,1,1,1,0),\120 _SEG7('P',1,1,0,0,1,1,1), _SEG7('Q',1,1,1,1,1,1,0), _SEG7('R',1,1,1,0,1,1,1),\121 _SEG7('S',1,0,1,1,0,1,1), _SEG7('T',0,0,0,1,1,1,1), _SEG7('U',0,1,1,1,1,1,0),\122 _SEG7('V',0,1,1,1,1,1,0), _SEG7('W',0,1,1,1,1,1,1), _SEG7('X',0,1,1,0,1,1,1),\123 _SEG7('Y',0,1,1,0,0,1,1), _SEG7('Z',1,1,0,1,1,0,1),124 125#define _MAP_91_96_ASCII_SEG7_SYMBOL \126 _SEG7('[',1,0,0,1,1,1,0), _SEG7('\\',0,0,1,0,0,1,1),_SEG7(']',1,1,1,1,0,0,0),\127 _SEG7('^',1,1,0,0,0,1,0), _SEG7('_',0,0,0,1,0,0,0), _SEG7('`',0,1,0,0,0,0,0),128 129#define _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \130 _SEG7('A',1,1,1,0,1,1,1), _SEG7('b',0,0,1,1,1,1,1), _SEG7('c',0,0,0,1,1,0,1),\131 _SEG7('d',0,1,1,1,1,0,1), _SEG7('E',1,0,0,1,1,1,1), _SEG7('F',1,0,0,0,1,1,1),\132 _SEG7('G',1,1,1,1,0,1,1), _SEG7('h',0,0,1,0,1,1,1), _SEG7('i',0,0,1,0,0,0,0),\133 _SEG7('j',0,0,1,1,0,0,0), _SEG7('k',0,0,1,0,1,1,1), _SEG7('L',0,0,0,1,1,1,0),\134 _SEG7('M',1,1,1,0,1,1,0), _SEG7('n',0,0,1,0,1,0,1), _SEG7('o',0,0,1,1,1,0,1),\135 _SEG7('P',1,1,0,0,1,1,1), _SEG7('q',1,1,1,0,0,1,1), _SEG7('r',0,0,0,0,1,0,1),\136 _SEG7('S',1,0,1,1,0,1,1), _SEG7('T',0,0,0,1,1,1,1), _SEG7('u',0,0,1,1,1,0,0),\137 _SEG7('v',0,0,1,1,1,0,0), _SEG7('W',0,1,1,1,1,1,1), _SEG7('X',0,1,1,0,1,1,1),\138 _SEG7('y',0,1,1,1,0,1,1), _SEG7('Z',1,1,0,1,1,0,1),139 140#define _MAP_123_126_ASCII_SEG7_SYMBOL \141 _SEG7('{',1,0,0,1,1,1,0), _SEG7('|',0,0,0,0,1,1,0), _SEG7('}',1,1,1,1,0,0,0),\142 _SEG7('~',1,0,0,0,0,0,0),143 144/* Maps */145 146/* This set tries to map as close as possible to the visible characteristics147 * of the ASCII symbol, lowercase and uppercase letters may differ in148 * presentation on the display.149 */150#define MAP_ASCII7SEG_ALPHANUM \151 _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \152 _MAP_33_47_ASCII_SEG7_SYMBOL \153 _MAP_48_57_ASCII_SEG7_NUMERIC \154 _MAP_58_64_ASCII_SEG7_SYMBOL \155 _MAP_65_90_ASCII_SEG7_ALPHA_UPPR \156 _MAP_91_96_ASCII_SEG7_SYMBOL \157 _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \158 _MAP_123_126_ASCII_SEG7_SYMBOL159 160/* This set tries to map as close as possible to the symbolic characteristics161 * of the ASCII character for maximum discrimination.162 * For now this means all alpha chars are in lower case representations.163 * (This for example facilitates the use of hex numbers with uppercase input.)164 */165#define MAP_ASCII7SEG_ALPHANUM_LC \166 _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \167 _MAP_33_47_ASCII_SEG7_SYMBOL \168 _MAP_48_57_ASCII_SEG7_NUMERIC \169 _MAP_58_64_ASCII_SEG7_SYMBOL \170 _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \171 _MAP_91_96_ASCII_SEG7_SYMBOL \172 _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \173 _MAP_123_126_ASCII_SEG7_SYMBOL174 175#define SEG7_DEFAULT_MAP(_name) \176 SEG7_CONVERSION_MAP(_name,MAP_ASCII7SEG_ALPHANUM)177 178#endif /* MAP_TO_7SEGMENT_H */179 180