linux/include/linux/map_to_7segment.h
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   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
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