1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 /*
3 * Copyright (C) 2021 Glider bv
4 *
5 * Based on include/uapi/linux/map_to_7segment.h:
6
7 * Copyright (c) 2005 Henk Vergonet <Henk.Vergonet@gmail.com>
8 */
9
10 #ifndef MAP_TO_14SEGMENT_H
11 #define MAP_TO_14SEGMENT_H
12
13 /* This file provides translation primitives and tables for the conversion
14 * of (ASCII) characters to a 14-segments notation.
15 *
16 * The 14 segment's wikipedia notation below is used as standard.
17 * See: https://en.wikipedia.org/wiki/Fourteen-segment_display
18 *
19 * Notation: +---a---+
20 * |\ | /|
21 * f h i j b
22 * | \|/ |
23 * +-g1+-g2+
24 * | /|\ |
25 * e k l m c
26 * |/ | \|
27 * +---d---+
28 *
29 * Usage:
30 *
31 * Register a map variable, and fill it with a character set:
32 * static SEG14_DEFAULT_MAP(map_seg14);
33 *
34 *
35 * Then use for conversion:
36 * seg14 = map_to_seg14(&map_seg14, some_char);
37 * ...
38 *
39 * In device drivers it is recommended, if required, to make the char map
40 * accessible via the sysfs interface using the following scheme:
41 *
42 * static ssize_t map_seg14_show(struct device *dev,
43 * struct device_attribute *attr, char *buf)
44 * {
45 * memcpy(buf, &map_seg14, sizeof(map_seg14));
46 * return sizeof(map_seg14);
47 * }
48 * static ssize_t map_seg14_store(struct device *dev,
49 * struct device_attribute *attr,
50 * const char *buf, size_t cnt)
51 * {
52 * if (cnt != sizeof(map_seg14))
53 * return -EINVAL;
54 * memcpy(&map_seg14, buf, cnt);
55 * return cnt;
56 * }
57 * static DEVICE_ATTR_RW(map_seg14);
58 */
59 #include <linux/errno.h>
60 #include <linux/types.h>
61
62 #include <asm/byteorder.h>
63
64 #define BIT_SEG14_A 0
65 #define BIT_SEG14_B 1
66 #define BIT_SEG14_C 2
67 #define BIT_SEG14_D 3
68 #define BIT_SEG14_E 4
69 #define BIT_SEG14_F 5
70 #define BIT_SEG14_G1 6
71 #define BIT_SEG14_G2 7
72 #define BIT_SEG14_H 8
73 #define BIT_SEG14_I 9
74 #define BIT_SEG14_J 10
75 #define BIT_SEG14_K 11
76 #define BIT_SEG14_L 12
77 #define BIT_SEG14_M 13
78 #define BIT_SEG14_RESERVED1 14
79 #define BIT_SEG14_RESERVED2 15
80
81 struct seg14_conversion_map {
82 __be16 table[128];
83 };
84
85 static __inline__ int map_to_seg14(struct seg14_conversion_map *map, int c)
86 {
87 if (c < 0 || c >= sizeof(map->table) / sizeof(map->table[0]))
88 return -EINVAL;
89
90 return __be16_to_cpu(map->table[c]);
91 }
92
93 #define SEG14_CONVERSION_MAP(_name, _map) \
94 struct seg14_conversion_map _name = { .table = { _map } }
95
96 /*
97 * It is recommended to use a facility that allows user space to redefine
98 * custom character sets for LCD devices. Please use a sysfs interface
99 * as described above.
100 */
101 #define MAP_TO_SEG14_SYSFS_FILE "map_seg14"
102
103 /*******************************************************************************
104 * ASCII conversion table
105 ******************************************************************************/
106
107 #define _SEG14(sym, a, b, c, d, e, f, g1, g2, h, j, k, l, m, n) \
108 __cpu_to_be16( a << BIT_SEG14_A | b << BIT_SEG14_B | \
109 c << BIT_SEG14_C | d << BIT_SEG14_D | \
110 e << BIT_SEG14_E | f << BIT_SEG14_F | \
111 g1 << BIT_SEG14_G1 | g2 << BIT_SEG14_G2 | \
112 h << BIT_SEG14_H | j << BIT_SEG14_I | \
113 k << BIT_SEG14_J | l << BIT_SEG14_K | \
114 m << BIT_SEG14_L | n << BIT_SEG14_M )
115
116 #define _MAP_0_32_ASCII_SEG14_NON_PRINTABLE \
117 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,
118
119 #define _MAP_33_47_ASCII_SEG14_SYMBOL \
120 _SEG14('!', 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), \
121 _SEG14('"', 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0), \
122 _SEG14('#', 0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0), \
123 _SEG14('$', 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0), \
124 _SEG14('%', 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0), \
125 _SEG14('&', 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1), \
126 _SEG14('\'',0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0), \
127 _SEG14('(', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1), \
128 _SEG14(')', 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0), \
129 _SEG14('*', 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1), \
130 _SEG14('+', 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0), \
131 _SEG14(',', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0), \
132 _SEG14('-', 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0), \
133 _SEG14('.', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1), \
134 _SEG14('/', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0),
135
136 #define _MAP_48_57_ASCII_SEG14_NUMERIC \
137 _SEG14('', 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0), \
138 _SEG14('1', 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0), \
139 _SEG14('2', 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0), \
140 _SEG14('3', 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0), \
141 _SEG14('4', 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0), \
142 _SEG14('5', 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1), \
143 _SEG14('6', 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0), \
144 _SEG14('7', 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0), \
145 _SEG14('8', 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0), \
146 _SEG14('9', 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0),
147
148 #define _MAP_58_64_ASCII_SEG14_SYMBOL \
149 _SEG14(':', 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0), \
150 _SEG14(';', 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0), \
151 _SEG14('<', 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1), \
152 _SEG14('=', 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0), \
153 _SEG14('>', 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0), \
154 _SEG14('?', 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0), \
155 _SEG14('@', 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0),
156
157 #define _MAP_65_90_ASCII_SEG14_ALPHA_UPPER \
158 _SEG14('A', 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0), \
159 _SEG14('B', 1, 1, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0), \
160 _SEG14('C', 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0), \
161 _SEG14('D', 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0), \
162 _SEG14('E', 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0), \
163 _SEG14('F', 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0), \
164 _SEG14('G', 1, 0, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0), \
165 _SEG14('H', 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0), \
166 _SEG14('I', 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0), \
167 _SEG14('J', 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), \
168 _SEG14('K', 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1), \
169 _SEG14('L', 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0), \
170 _SEG14('M', 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0), \
171 _SEG14('N', 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1), \
172 _SEG14('O', 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0), \
173 _SEG14('P', 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0), \
174 _SEG14('Q', 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1), \
175 _SEG14('R', 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1), \
176 _SEG14('S', 1, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0), \
177 _SEG14('T', 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0), \
178 _SEG14('U', 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0), \
179 _SEG14('V', 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0), \
180 _SEG14('W', 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 1), \
181 _SEG14('X', 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1), \
182 _SEG14('Y', 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0), \
183 _SEG14('Z', 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0),
184
185 #define _MAP_91_96_ASCII_SEG14_SYMBOL \
186 _SEG14('[', 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0), \
187 _SEG14('\\',0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1), \
188 _SEG14(']', 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), \
189 _SEG14('^', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1), \
190 _SEG14('_', 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), \
191 _SEG14('`', 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0),
192
193 #define _MAP_97_122_ASCII_SEG14_ALPHA_LOWER \
194 _SEG14('a', 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0), \
195 _SEG14('b', 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1), \
196 _SEG14('c', 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0), \
197 _SEG14('d', 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0), \
198 _SEG14('e', 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0), \
199 _SEG14('f', 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0), \
200 _SEG14('g', 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0), \
201 _SEG14('h', 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0), \
202 _SEG14('i', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0), \
203 _SEG14('j', 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0), \
204 _SEG14('k', 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1), \
205 _SEG14('l', 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0), \
206 _SEG14('m', 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0), \
207 _SEG14('n', 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0), \
208 _SEG14('o', 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0), \
209 _SEG14('p', 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0), \
210 _SEG14('q', 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0), \
211 _SEG14('r', 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0), \
212 _SEG14('s', 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1), \
213 _SEG14('t', 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0), \
214 _SEG14('u', 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0), \
215 _SEG14('v', 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0), \
216 _SEG14('w', 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1), \
217 _SEG14('x', 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 1), \
218 _SEG14('y', 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0), \
219 _SEG14('z', 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0),
220
221 #define _MAP_123_126_ASCII_SEG14_SYMBOL \
222 _SEG14('{', 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0), \
223 _SEG14('|', 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0), \
224 _SEG14('}', 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1), \
225 _SEG14('~', 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0),
226
227 /* Maps */
228 #define MAP_ASCII14SEG_ALPHANUM \
229 _MAP_0_32_ASCII_SEG14_NON_PRINTABLE \
230 _MAP_33_47_ASCII_SEG14_SYMBOL \
231 _MAP_48_57_ASCII_SEG14_NUMERIC \
232 _MAP_58_64_ASCII_SEG14_SYMBOL \
233 _MAP_65_90_ASCII_SEG14_ALPHA_UPPER \
234 _MAP_91_96_ASCII_SEG14_SYMBOL \
235 _MAP_97_122_ASCII_SEG14_ALPHA_LOWER \
236 _MAP_123_126_ASCII_SEG14_SYMBOL
237
238 #define SEG14_DEFAULT_MAP(_name) \
239 SEG14_CONVERSION_MAP(_name, MAP_ASCII14SEG_ALPHANUM)
240
241 #endif /* MAP_TO_14SEGMENT_H */
242
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