1/* 2 * drivers/usb/input/map_to_7segment.h 3 * 4 * Copyright (c) 2005 Henk Vergonet <Henk.Vergonet@gmail.com> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20 21#ifndef MAP_TO_7SEGMENT_H 22#define MAP_TO_7SEGMENT_H 23 24/* This file provides translation primitives and tables for the conversion 25 * of (ASCII) characters to a 7-segments notation. 26 * 27 * The 7 segment's wikipedia notation below is used as standard. 28 * See: http://en.wikipedia.org/wiki/Seven_segment_display 29 * 30 * Notation: +-a-+ 31 * f b 32 * +-g-+ 33 * e c 34 * +-d-+ 35 * 36 * Usage: 37 * 38 * Register a map variable, and fill it with a character set: 39 * static SEG7_DEFAULT_MAP(map_seg7); 40 * 41 * 42 * Then use for conversion: 43 * seg7 = map_to_seg7(&map_seg7, some_char); 44 * ... 45 * 46 * In device drivers it is recommended, if required, to make the char map 47 * accessible via the sysfs interface using the following scheme: 48 * 49 * static ssize_t show_map(struct device *dev, char *buf) { 50 * memcpy(buf, &map_seg7, sizeof(map_seg7)); 51 * return sizeof(map_seg7); 52 * } 53 * static ssize_t store_map(struct device *dev, const char *buf, size_t cnt) { 54 * if(cnt != sizeof(map_seg7)) 55 * return -EINVAL; 56 * memcpy(&map_seg7, buf, cnt); 57 * return cnt; 58 * } 59 * static DEVICE_ATTR(map_seg7, PERMS_RW, show_map, store_map); 60 * 61 * History: 62 * 2005-05-31 RFC linux-kernel@vger.kernel.org 63 */ 64#include <linux/errno.h> 65 66 67#define BIT_SEG7_A 0 68#define BIT_SEG7_B 1 69#define BIT_SEG7_C 2 70#define BIT_SEG7_D 3 71#define BIT_SEG7_E 4 72#define BIT_SEG7_F 5 73#define BIT_SEG7_G 6 74#define BIT_SEG7_RESERVED 7 75 76struct seg7_conversion_map { 77 unsigned char table[128]; 78}; 79 80static inline int map_to_seg7(struct seg7_conversion_map *map, int c) 81{ 82 return c >= 0 && c < sizeof(map->table) ? map->table[c] : -EINVAL; 83} 84 85#define SEG7_CONVERSION_MAP(_name, _map) \ 86 struct seg7_conversion_map _name = { .table = { _map } } 87 88/* 89 * It is recommended to use a facility that allows user space to redefine 90 * custom character sets for LCD devices. Please use a sysfs interface 91 * as described above. 92 */ 93#define MAP_TO_SEG7_SYSFS_FILE "map_seg7" 94 95/******************************************************************************* 96 * ASCII conversion table 97 ******************************************************************************/ 98 99#define _SEG7(l,a,b,c,d,e,f,g) \ 100 ( a<<BIT_SEG7_A | b<<BIT_SEG7_B | c<<BIT_SEG7_C | d<<BIT_SEG7_D | \ 101 e<<BIT_SEG7_E | f<<BIT_SEG7_F | g<<BIT_SEG7_G ) 102 103#define _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \ 104 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, 105 106#define _MAP_33_47_ASCII_SEG7_SYMBOL \ 107 _SEG7('!',0,0,0,0,1,1,0), _SEG7('"',0,1,0,0,0,1,0), _SEG7('#',0,1,1,0,1,1,0),\ 108 _SEG7('$',1,0,1,1,0,1,1), _SEG7('%',0,0,1,0,0,1,0), _SEG7('&',1,0,1,1,1,1,1),\ 109 _SEG7('\'',0,0,0,0,0,1,0),_SEG7('(',1,0,0,1,1,1,0), _SEG7(')',1,1,1,1,0,0,0),\ 110 _SEG7('*',0,1,1,0,1,1,1), _SEG7('+',0,1,1,0,0,0,1), _SEG7(',',0,0,0,0,1,0,0),\ 111 _SEG7('-',0,0,0,0,0,0,1), _SEG7('.',0,0,0,0,1,0,0), _SEG7('/',0,1,0,0,1,0,1), 112 113#define _MAP_48_57_ASCII_SEG7_NUMERIC \ 114 _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),\ 115 _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),\ 116 _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),\ 117 _SEG7('9',1,1,1,1,0,1,1), 118 119#define _MAP_58_64_ASCII_SEG7_SYMBOL \ 120 _SEG7(':',0,0,0,1,0,0,1), _SEG7(';',0,0,0,1,0,0,1), _SEG7('<',1,0,0,0,0,1,1),\ 121 _SEG7('=',0,0,0,1,0,0,1), _SEG7('>',1,1,0,0,0,0,1), _SEG7('?',1,1,1,0,0,1,0),\ 122 _SEG7('@',1,1,0,1,1,1,1), 123 124#define _MAP_65_90_ASCII_SEG7_ALPHA_UPPR \ 125 _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),\ 126 _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),\ 127 _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),\ 128 _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),\ 129 _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),\ 130 _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),\ 131 _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),\ 132 _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),\ 133 _SEG7('Y',0,1,1,0,0,1,1), _SEG7('Z',1,1,0,1,1,0,1), 134 135#define _MAP_91_96_ASCII_SEG7_SYMBOL \ 136 _SEG7('[',1,0,0,1,1,1,0), _SEG7('\\',0,0,1,0,0,1,1),_SEG7(']',1,1,1,1,0,0,0),\ 137 _SEG7('^',1,1,0,0,0,1,0), _SEG7('_',0,0,0,1,0,0,0), _SEG7('`',0,1,0,0,0,0,0), 138 139#define _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \ 140 _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),\ 141 _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),\ 142 _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),\ 143 _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),\ 144 _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),\ 145 _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),\ 146 _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),\ 147 _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),\ 148 _SEG7('y',0,1,1,1,0,1,1), _SEG7('Z',1,1,0,1,1,0,1), 149 150#define _MAP_123_126_ASCII_SEG7_SYMBOL \ 151 _SEG7('{',1,0,0,1,1,1,0), _SEG7('|',0,0,0,0,1,1,0), _SEG7('}',1,1,1,1,0,0,0),\ 152 _SEG7('~',1,0,0,0,0,0,0), 153 154/* Maps */ 155 156/* This set tries to map as close as possible to the visible characteristics 157 * of the ASCII symbol, lowercase and uppercase letters may differ in 158 * presentation on the display. 159 */ 160#define MAP_ASCII7SEG_ALPHANUM \ 161 _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \ 162 _MAP_33_47_ASCII_SEG7_SYMBOL \ 163 _MAP_48_57_ASCII_SEG7_NUMERIC \ 164 _MAP_58_64_ASCII_SEG7_SYMBOL \ 165 _MAP_65_90_ASCII_SEG7_ALPHA_UPPR \ 166 _MAP_91_96_ASCII_SEG7_SYMBOL \ 167 _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \ 168 _MAP_123_126_ASCII_SEG7_SYMBOL 169 170/* This set tries to map as close as possible to the symbolic characteristics 171 * of the ASCII character for maximum discrimination. 172 * For now this means all alpha chars are in lower case representations. 173 * (This for example facilitates the use of hex numbers with uppercase input.) 174 */ 175#define MAP_ASCII7SEG_ALPHANUM_LC \ 176 _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \ 177 _MAP_33_47_ASCII_SEG7_SYMBOL \ 178 _MAP_48_57_ASCII_SEG7_NUMERIC \ 179 _MAP_58_64_ASCII_SEG7_SYMBOL \ 180 _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \ 181 _MAP_91_96_ASCII_SEG7_SYMBOL \ 182 _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \ 183 _MAP_123_126_ASCII_SEG7_SYMBOL 184 185#define SEG7_DEFAULT_MAP(_name) \ 186 SEG7_CONVERSION_MAP(_name,MAP_ASCII7SEG_ALPHANUM) 187 188#endif /* MAP_TO_7SEGMENT_H */ 189