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aca951a2 | 1 | /* |
aca951a2 H |
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: | |
f9da8d15 | 37 | * static SEG7_DEFAULT_MAP(map_seg7); |
aca951a2 H |
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 | ||
74 | struct seg7_conversion_map { | |
75 | unsigned char table[128]; | |
76 | }; | |
77 | ||
34a4c5eb | 78 | static __inline__ int map_to_seg7(struct seg7_conversion_map *map, int c) |
aca951a2 | 79 | { |
af64a5eb | 80 | return c >= 0 && c < sizeof(map->table) ? map->table[c] : -EINVAL; |
aca951a2 H |
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 |