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