1 | /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ |
2 | /* |
3 | * Copyright (c) 2005 Henk Vergonet <Henk.Vergonet@gmail.com> |
4 | */ |
5 | |
6 | #ifndef MAP_TO_7SEGMENT_H |
7 | #define MAP_TO_7SEGMENT_H |
8 | |
9 | /* This file provides translation primitives and tables for the conversion |
10 | * of (ASCII) characters to a 7-segments notation. |
11 | * |
12 | * The 7 segment's wikipedia notation below is used as standard. |
13 | * See: https://en.wikipedia.org/wiki/Seven_segment_display |
14 | * |
15 | * Notation: +-a-+ |
16 | * f b |
17 | * +-g-+ |
18 | * e c |
19 | * +-d-+ |
20 | * |
21 | * Usage: |
22 | * |
23 | * Register a map variable, and fill it with a character set: |
24 | * static SEG7_DEFAULT_MAP(map_seg7); |
25 | * |
26 | * |
27 | * Then use for conversion: |
28 | * seg7 = map_to_seg7(&map_seg7, some_char); |
29 | * ... |
30 | * |
31 | * In device drivers it is recommended, if required, to make the char map |
32 | * accessible via the sysfs interface using the following scheme: |
33 | * |
34 | * static ssize_t map_seg7_show(struct device *dev, |
35 | * struct device_attribute *attr, char *buf) |
36 | * { |
37 | * memcpy(buf, &map_seg7, sizeof(map_seg7)); |
38 | * return sizeof(map_seg7); |
39 | * } |
40 | * static ssize_t map_seg7_store(struct device *dev, |
41 | * struct device_attribute *attr, const char *buf, |
42 | * size_t cnt) |
43 | * { |
44 | * if(cnt != sizeof(map_seg7)) |
45 | * return -EINVAL; |
46 | * memcpy(&map_seg7, buf, cnt); |
47 | * return cnt; |
48 | * } |
49 | * static DEVICE_ATTR_RW(map_seg7); |
50 | * |
51 | * History: |
52 | * 2005-05-31 RFC linux-kernel@vger.kernel.org |
53 | */ |
54 | #include <linux/errno.h> |
55 | |
56 | |
57 | #define BIT_SEG7_A 0 |
58 | #define BIT_SEG7_B 1 |
59 | #define BIT_SEG7_C 2 |
60 | #define BIT_SEG7_D 3 |
61 | #define BIT_SEG7_E 4 |
62 | #define BIT_SEG7_F 5 |
63 | #define BIT_SEG7_G 6 |
64 | #define BIT_SEG7_RESERVED 7 |
65 | |
66 | struct seg7_conversion_map { |
67 | unsigned char table[128]; |
68 | }; |
69 | |
70 | static __inline__ int map_to_seg7(struct seg7_conversion_map *map, int c) |
71 | { |
72 | return c >= 0 && c < sizeof(map->table) ? map->table[c] : -EINVAL; |
73 | } |
74 | |
75 | #define SEG7_CONVERSION_MAP(_name, _map) \ |
76 | struct seg7_conversion_map _name = { .table = { _map } } |
77 | |
78 | /* |
79 | * It is recommended to use a facility that allows user space to redefine |
80 | * custom character sets for LCD devices. Please use a sysfs interface |
81 | * as described above. |
82 | */ |
83 | #define MAP_TO_SEG7_SYSFS_FILE "map_seg7" |
84 | |
85 | /******************************************************************************* |
86 | * ASCII conversion table |
87 | ******************************************************************************/ |
88 | |
89 | #define _SEG7(l,a,b,c,d,e,f,g) \ |
90 | ( a<<BIT_SEG7_A | b<<BIT_SEG7_B | c<<BIT_SEG7_C | d<<BIT_SEG7_D | \ |
91 | e<<BIT_SEG7_E | f<<BIT_SEG7_F | g<<BIT_SEG7_G ) |
92 | |
93 | #define _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \ |
94 | 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, |
95 | |
96 | #define _MAP_33_47_ASCII_SEG7_SYMBOL \ |
97 | _SEG7('!',0,0,0,0,1,1,0), _SEG7('"',0,1,0,0,0,1,0), _SEG7('#',0,1,1,0,1,1,0),\ |
98 | _SEG7('$',1,0,1,1,0,1,1), _SEG7('%',0,0,1,0,0,1,0), _SEG7('&',1,0,1,1,1,1,1),\ |
99 | _SEG7('\'',0,0,0,0,0,1,0),_SEG7('(',1,0,0,1,1,1,0), _SEG7(')',1,1,1,1,0,0,0),\ |
100 | _SEG7('*',0,1,1,0,1,1,1), _SEG7('+',0,1,1,0,0,0,1), _SEG7(',',0,0,0,0,1,0,0),\ |
101 | _SEG7('-',0,0,0,0,0,0,1), _SEG7('.',0,0,0,0,1,0,0), _SEG7('/',0,1,0,0,1,0,1), |
102 | |
103 | #define _MAP_48_57_ASCII_SEG7_NUMERIC \ |
104 | _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),\ |
105 | _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),\ |
106 | _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),\ |
107 | _SEG7('9',1,1,1,1,0,1,1), |
108 | |
109 | #define _MAP_58_64_ASCII_SEG7_SYMBOL \ |
110 | _SEG7(':',0,0,0,1,0,0,1), _SEG7(';',0,0,0,1,0,0,1), _SEG7('<',1,0,0,0,0,1,1),\ |
111 | _SEG7('=',0,0,0,1,0,0,1), _SEG7('>',1,1,0,0,0,0,1), _SEG7('?',1,1,1,0,0,1,0),\ |
112 | _SEG7('@',1,1,0,1,1,1,1), |
113 | |
114 | #define _MAP_65_90_ASCII_SEG7_ALPHA_UPPR \ |
115 | _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),\ |
116 | _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),\ |
117 | _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),\ |
118 | _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),\ |
119 | _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),\ |
120 | _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),\ |
121 | _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),\ |
122 | _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),\ |
123 | _SEG7('Y',0,1,1,0,0,1,1), _SEG7('Z',1,1,0,1,1,0,1), |
124 | |
125 | #define _MAP_91_96_ASCII_SEG7_SYMBOL \ |
126 | _SEG7('[',1,0,0,1,1,1,0), _SEG7('\\',0,0,1,0,0,1,1),_SEG7(']',1,1,1,1,0,0,0),\ |
127 | _SEG7('^',1,1,0,0,0,1,0), _SEG7('_',0,0,0,1,0,0,0), _SEG7('`',0,1,0,0,0,0,0), |
128 | |
129 | #define _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \ |
130 | _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),\ |
131 | _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),\ |
132 | _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),\ |
133 | _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),\ |
134 | _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),\ |
135 | _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),\ |
136 | _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),\ |
137 | _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),\ |
138 | _SEG7('y',0,1,1,1,0,1,1), _SEG7('Z',1,1,0,1,1,0,1), |
139 | |
140 | #define _MAP_123_126_ASCII_SEG7_SYMBOL \ |
141 | _SEG7('{',1,0,0,1,1,1,0), _SEG7('|',0,0,0,0,1,1,0), _SEG7('}',1,1,1,1,0,0,0),\ |
142 | _SEG7('~',1,0,0,0,0,0,0), |
143 | |
144 | /* Maps */ |
145 | |
146 | /* This set tries to map as close as possible to the visible characteristics |
147 | * of the ASCII symbol, lowercase and uppercase letters may differ in |
148 | * presentation on the display. |
149 | */ |
150 | #define MAP_ASCII7SEG_ALPHANUM \ |
151 | _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \ |
152 | _MAP_33_47_ASCII_SEG7_SYMBOL \ |
153 | _MAP_48_57_ASCII_SEG7_NUMERIC \ |
154 | _MAP_58_64_ASCII_SEG7_SYMBOL \ |
155 | _MAP_65_90_ASCII_SEG7_ALPHA_UPPR \ |
156 | _MAP_91_96_ASCII_SEG7_SYMBOL \ |
157 | _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \ |
158 | _MAP_123_126_ASCII_SEG7_SYMBOL |
159 | |
160 | /* This set tries to map as close as possible to the symbolic characteristics |
161 | * of the ASCII character for maximum discrimination. |
162 | * For now this means all alpha chars are in lower case representations. |
163 | * (This for example facilitates the use of hex numbers with uppercase input.) |
164 | */ |
165 | #define MAP_ASCII7SEG_ALPHANUM_LC \ |
166 | _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \ |
167 | _MAP_33_47_ASCII_SEG7_SYMBOL \ |
168 | _MAP_48_57_ASCII_SEG7_NUMERIC \ |
169 | _MAP_58_64_ASCII_SEG7_SYMBOL \ |
170 | _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \ |
171 | _MAP_91_96_ASCII_SEG7_SYMBOL \ |
172 | _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \ |
173 | _MAP_123_126_ASCII_SEG7_SYMBOL |
174 | |
175 | #define SEG7_DEFAULT_MAP(_name) \ |
176 | SEG7_CONVERSION_MAP(_name,MAP_ASCII7SEG_ALPHANUM) |
177 | |
178 | #endif /* MAP_TO_7SEGMENT_H */ |
179 | |
180 | |