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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
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