map_to_7segment.h (6606B) - Raw
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_H 7 #define MAP_TO_7SEGMENT_H 8 9 /* This file provides translation primitives and tables for the conversion 10 * 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_display 14 * 15 * Notation: +-a-+ 16 * f b 17 * +-g-+ 18 * e c 19 * +-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 map 32 * 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.org 53 */ 54 #include <linux/errno.h> 55 56 57 #define BIT_SEG7_A 0 58 #define BIT_SEG7_B 1 59 #define BIT_SEG7_C 2 60 #define BIT_SEG7_D 3 61 #define BIT_SEG7_E 4 62 #define BIT_SEG7_F 5 63 #define BIT_SEG7_G 6 64 #define BIT_SEG7_RESERVED 7 65 66 struct seg7_conversion_map { 67 unsigned char table[128]; 68 }; 69 70 static __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 redefine 80 * custom character sets for LCD devices. Please use a sysfs interface 81 * as described above. 82 */ 83 #define MAP_TO_SEG7_SYSFS_FILE "map_seg7" 84 85 /******************************************************************************* 86 * ASCII conversion table 87 ******************************************************************************/ 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 characteristics 147 * of the ASCII symbol, lowercase and uppercase letters may differ in 148 * 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_SYMBOL 159 160 /* This set tries to map as close as possible to the symbolic characteristics 161 * 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_SYMBOL 174 175 #define SEG7_DEFAULT_MAP(_name) \ 176 SEG7_CONVERSION_MAP(_name,MAP_ASCII7SEG_ALPHANUM) 177 178 #endif /* MAP_TO_7SEGMENT_H */