1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ 2 /* 3 * Copyright (c) 2005 Henk Vergonet <Henk.Vergonet@gmail.com> 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation; either version 2 of 8 * the License, or (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 20 #ifndef MAP_TO_7SEGMENT_H 21 #define MAP_TO_7SEGMENT_H 22 23 /* This file provides translation primitives and tables for the conversion 24 * of (ASCII) characters to a 7-segments notation. 25 * 26 * The 7 segment's wikipedia notation below is used as standard. 27 * See: https://en.wikipedia.org/wiki/Seven_segment_display 28 * 29 * Notation: +-a-+ 30 * f b 31 * +-g-+ 32 * e c 33 * +-d-+ 34 * 35 * Usage: 36 * 37 * Register a map variable, and fill it with a character set: 38 * static SEG7_DEFAULT_MAP(map_seg7); 39 * 40 * 41 * Then use for conversion: 42 * seg7 = map_to_seg7(&map_seg7, some_char); 43 * ... 44 * 45 * In device drivers it is recommended, if required, to make the char map 46 * accessible via the sysfs interface using the following scheme: 47 * 48 * static ssize_t show_map(struct device *dev, char *buf) { 49 * memcpy(buf, &map_seg7, sizeof(map_seg7)); 50 * return sizeof(map_seg7); 51 * } 52 * static ssize_t store_map(struct device *dev, const char *buf, size_t cnt) { 53 * if(cnt != sizeof(map_seg7)) 54 * return -EINVAL; 55 * memcpy(&map_seg7, buf, cnt); 56 * return cnt; 57 * } 58 * static DEVICE_ATTR(map_seg7, PERMS_RW, show_map, store_map); 59 * 60 * History: 61 * 2005-05-31 RFC linux-kernel@vger.kernel.org 62 */ 63 #include <linux/errno.h> 64 65 66 #define BIT_SEG7_A 0 67 #define BIT_SEG7_B 1 68 #define BIT_SEG7_C 2 69 #define BIT_SEG7_D 3 70 #define BIT_SEG7_E 4 71 #define BIT_SEG7_F 5 72 #define BIT_SEG7_G 6 73 #define BIT_SEG7_RESERVED 7 74 75 struct seg7_conversion_map { 76 unsigned char table[128]; 77 }; 78 79 static __inline__ int map_to_seg7(struct seg7_conversion_map *map, int c) 80 { 81 return c >= 0 && c < sizeof(map->table) ? map->table[c] : -EINVAL; 82 } 83 84 #define SEG7_CONVERSION_MAP(_name, _map) \ 85 struct seg7_conversion_map _name = { .table = { _map } } 86 87 /* 88 * It is recommended to use a facility that allows user space to redefine 89 * custom character sets for LCD devices. Please use a sysfs interface 90 * as described above. 91 */ 92 #define MAP_TO_SEG7_SYSFS_FILE "map_seg7" 93 94 /******************************************************************************* 95 * ASCII conversion table 96 ******************************************************************************/ 97 98 #define _SEG7(l,a,b,c,d,e,f,g) \ 99 ( a<<BIT_SEG7_A | b<<BIT_SEG7_B | c<<BIT_SEG7_C | d<<BIT_SEG7_D | \ 100 e<<BIT_SEG7_E | f<<BIT_SEG7_F | g<<BIT_SEG7_G ) 101 102 #define _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \ 103 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, 104 105 #define _MAP_33_47_ASCII_SEG7_SYMBOL \ 106 _SEG7('!',0,0,0,0,1,1,0), _SEG7('"',0,1,0,0,0,1,0), _SEG7('#',0,1,1,0,1,1,0),\ 107 _SEG7('$',1,0,1,1,0,1,1), _SEG7('%',0,0,1,0,0,1,0), _SEG7('&',1,0,1,1,1,1,1),\ 108 _SEG7('\'',0,0,0,0,0,1,0),_SEG7('(',1,0,0,1,1,1,0), _SEG7(')',1,1,1,1,0,0,0),\ 109 _SEG7('*',0,1,1,0,1,1,1), _SEG7('+',0,1,1,0,0,0,1), _SEG7(',',0,0,0,0,1,0,0),\ 110 _SEG7('-',0,0,0,0,0,0,1), _SEG7('.',0,0,0,0,1,0,0), _SEG7('/',0,1,0,0,1,0,1), 111 112 #define _MAP_48_57_ASCII_SEG7_NUMERIC \ 113 _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),\ 114 _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),\ 115 _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),\ 116 _SEG7('9',1,1,1,1,0,1,1), 117 118 #define _MAP_58_64_ASCII_SEG7_SYMBOL \ 119 _SEG7(':',0,0,0,1,0,0,1), _SEG7(';',0,0,0,1,0,0,1), _SEG7('<',1,0,0,0,0,1,1),\ 120 _SEG7('=',0,0,0,1,0,0,1), _SEG7('>',1,1,0,0,0,0,1), _SEG7('?',1,1,1,0,0,1,0),\ 121 _SEG7('@',1,1,0,1,1,1,1), 122 123 #define _MAP_65_90_ASCII_SEG7_ALPHA_UPPR \ 124 _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),\ 125 _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),\ 126 _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),\ 127 _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),\ 128 _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),\ 129 _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),\ 130 _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),\ 131 _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),\ 132 _SEG7('Y',0,1,1,0,0,1,1), _SEG7('Z',1,1,0,1,1,0,1), 133 134 #define _MAP_91_96_ASCII_SEG7_SYMBOL \ 135 _SEG7('[',1,0,0,1,1,1,0), _SEG7('\\',0,0,1,0,0,1,1),_SEG7(']',1,1,1,1,0,0,0),\ 136 _SEG7('^',1,1,0,0,0,1,0), _SEG7('_',0,0,0,1,0,0,0), _SEG7('`',0,1,0,0,0,0,0), 137 138 #define _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \ 139 _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),\ 140 _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),\ 141 _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),\ 142 _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),\ 143 _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),\ 144 _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),\ 145 _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),\ 146 _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),\ 147 _SEG7('y',0,1,1,1,0,1,1), _SEG7('Z',1,1,0,1,1,0,1), 148 149 #define _MAP_123_126_ASCII_SEG7_SYMBOL \ 150 _SEG7('{',1,0,0,1,1,1,0), _SEG7('|',0,0,0,0,1,1,0), _SEG7('}',1,1,1,1,0,0,0),\ 151 _SEG7('~',1,0,0,0,0,0,0), 152 153 /* Maps */ 154 155 /* This set tries to map as close as possible to the visible characteristics 156 * of the ASCII symbol, lowercase and uppercase letters may differ in 157 * presentation on the display. 158 */ 159 #define MAP_ASCII7SEG_ALPHANUM \ 160 _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \ 161 _MAP_33_47_ASCII_SEG7_SYMBOL \ 162 _MAP_48_57_ASCII_SEG7_NUMERIC \ 163 _MAP_58_64_ASCII_SEG7_SYMBOL \ 164 _MAP_65_90_ASCII_SEG7_ALPHA_UPPR \ 165 _MAP_91_96_ASCII_SEG7_SYMBOL \ 166 _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \ 167 _MAP_123_126_ASCII_SEG7_SYMBOL 168 169 /* This set tries to map as close as possible to the symbolic characteristics 170 * of the ASCII character for maximum discrimination. 171 * For now this means all alpha chars are in lower case representations. 172 * (This for example facilitates the use of hex numbers with uppercase input.) 173 */ 174 #define MAP_ASCII7SEG_ALPHANUM_LC \ 175 _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \ 176 _MAP_33_47_ASCII_SEG7_SYMBOL \ 177 _MAP_48_57_ASCII_SEG7_NUMERIC \ 178 _MAP_58_64_ASCII_SEG7_SYMBOL \ 179 _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \ 180 _MAP_91_96_ASCII_SEG7_SYMBOL \ 181 _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \ 182 _MAP_123_126_ASCII_SEG7_SYMBOL 183 184 #define SEG7_DEFAULT_MAP(_name) \ 185 SEG7_CONVERSION_MAP(_name,MAP_ASCII7SEG_ALPHANUM) 186 187 #endif /* MAP_TO_7SEGMENT_H */ 188 189