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1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2/*
3 * Copyright (c) 2005 Henk Vergonet <Henk.Vergonet@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of
8 * the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#ifndef MAP_TO_7SEGMENT_H
21#define MAP_TO_7SEGMENT_H
22
23/* This file provides translation primitives and tables for the conversion
24 * of (ASCII) characters to a 7-segments notation.
25 *
26 * The 7 segment's wikipedia notation below is used as standard.
27 * See: https://en.wikipedia.org/wiki/Seven_segment_display
28 *
29 * Notation: +-a-+
30 * f b
31 * +-g-+
32 * e c
33 * +-d-+
34 *
35 * Usage:
36 *
37 * Register a map variable, and fill it with a character set:
38 * static SEG7_DEFAULT_MAP(map_seg7);
39 *
40 *
41 * Then use for conversion:
42 * seg7 = map_to_seg7(&map_seg7, some_char);
43 * ...
44 *
45 * In device drivers it is recommended, if required, to make the char map
46 * accessible via the sysfs interface using the following scheme:
47 *
48 * static ssize_t map_seg7_show(struct device *dev,
49 * struct device_attribute *attr, char *buf)
50 * {
51 * memcpy(buf, &map_seg7, sizeof(map_seg7));
52 * return sizeof(map_seg7);
53 * }
54 * static ssize_t map_seg7_store(struct device *dev,
55 * struct device_attribute *attr, const char *buf,
56 * size_t cnt)
57 * {
58 * if(cnt != sizeof(map_seg7))
59 * return -EINVAL;
60 * memcpy(&map_seg7, buf, cnt);
61 * return cnt;
62 * }
63 * static DEVICE_ATTR_RW(map_seg7);
64 *
65 * History:
66 * 2005-05-31 RFC linux-kernel@vger.kernel.org
67 */
68#include <linux/errno.h>
69
70
71#define BIT_SEG7_A 0
72#define BIT_SEG7_B 1
73#define BIT_SEG7_C 2
74#define BIT_SEG7_D 3
75#define BIT_SEG7_E 4
76#define BIT_SEG7_F 5
77#define BIT_SEG7_G 6
78#define BIT_SEG7_RESERVED 7
79
80struct seg7_conversion_map {
81 unsigned char table[128];
82};
83
84static __inline__ int map_to_seg7(struct seg7_conversion_map *map, int c)
85{
86 return c >= 0 && c < sizeof(map->table) ? map->table[c] : -EINVAL;
87}
88
89#define SEG7_CONVERSION_MAP(_name, _map) \
90 struct seg7_conversion_map _name = { .table = { _map } }
91
92/*
93 * It is recommended to use a facility that allows user space to redefine
94 * custom character sets for LCD devices. Please use a sysfs interface
95 * as described above.
96 */
97#define MAP_TO_SEG7_SYSFS_FILE "map_seg7"
98
99/*******************************************************************************
100 * ASCII conversion table
101 ******************************************************************************/
102
103#define _SEG7(l,a,b,c,d,e,f,g) \
104 ( a<<BIT_SEG7_A | b<<BIT_SEG7_B | c<<BIT_SEG7_C | d<<BIT_SEG7_D | \
105 e<<BIT_SEG7_E | f<<BIT_SEG7_F | g<<BIT_SEG7_G )
106
107#define _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \
108 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,
109
110#define _MAP_33_47_ASCII_SEG7_SYMBOL \
111 _SEG7('!',0,0,0,0,1,1,0), _SEG7('"',0,1,0,0,0,1,0), _SEG7('#',0,1,1,0,1,1,0),\
112 _SEG7('$',1,0,1,1,0,1,1), _SEG7('%',0,0,1,0,0,1,0), _SEG7('&',1,0,1,1,1,1,1),\
113 _SEG7('\'',0,0,0,0,0,1,0),_SEG7('(',1,0,0,1,1,1,0), _SEG7(')',1,1,1,1,0,0,0),\
114 _SEG7('*',0,1,1,0,1,1,1), _SEG7('+',0,1,1,0,0,0,1), _SEG7(',',0,0,0,0,1,0,0),\
115 _SEG7('-',0,0,0,0,0,0,1), _SEG7('.',0,0,0,0,1,0,0), _SEG7('/',0,1,0,0,1,0,1),
116
117#define _MAP_48_57_ASCII_SEG7_NUMERIC \
118 _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),\
119 _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),\
120 _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),\
121 _SEG7('9',1,1,1,1,0,1,1),
122
123#define _MAP_58_64_ASCII_SEG7_SYMBOL \
124 _SEG7(':',0,0,0,1,0,0,1), _SEG7(';',0,0,0,1,0,0,1), _SEG7('<',1,0,0,0,0,1,1),\
125 _SEG7('=',0,0,0,1,0,0,1), _SEG7('>',1,1,0,0,0,0,1), _SEG7('?',1,1,1,0,0,1,0),\
126 _SEG7('@',1,1,0,1,1,1,1),
127
128#define _MAP_65_90_ASCII_SEG7_ALPHA_UPPR \
129 _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),\
130 _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),\
131 _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),\
132 _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),\
133 _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),\
134 _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),\
135 _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),\
136 _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),\
137 _SEG7('Y',0,1,1,0,0,1,1), _SEG7('Z',1,1,0,1,1,0,1),
138
139#define _MAP_91_96_ASCII_SEG7_SYMBOL \
140 _SEG7('[',1,0,0,1,1,1,0), _SEG7('\\',0,0,1,0,0,1,1),_SEG7(']',1,1,1,1,0,0,0),\
141 _SEG7('^',1,1,0,0,0,1,0), _SEG7('_',0,0,0,1,0,0,0), _SEG7('`',0,1,0,0,0,0,0),
142
143#define _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \
144 _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),\
145 _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),\
146 _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),\
147 _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),\
148 _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),\
149 _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),\
150 _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),\
151 _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),\
152 _SEG7('y',0,1,1,1,0,1,1), _SEG7('Z',1,1,0,1,1,0,1),
153
154#define _MAP_123_126_ASCII_SEG7_SYMBOL \
155 _SEG7('{',1,0,0,1,1,1,0), _SEG7('|',0,0,0,0,1,1,0), _SEG7('}',1,1,1,1,0,0,0),\
156 _SEG7('~',1,0,0,0,0,0,0),
157
158/* Maps */
159
160/* This set tries to map as close as possible to the visible characteristics
161 * of the ASCII symbol, lowercase and uppercase letters may differ in
162 * presentation on the display.
163 */
164#define MAP_ASCII7SEG_ALPHANUM \
165 _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \
166 _MAP_33_47_ASCII_SEG7_SYMBOL \
167 _MAP_48_57_ASCII_SEG7_NUMERIC \
168 _MAP_58_64_ASCII_SEG7_SYMBOL \
169 _MAP_65_90_ASCII_SEG7_ALPHA_UPPR \
170 _MAP_91_96_ASCII_SEG7_SYMBOL \
171 _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \
172 _MAP_123_126_ASCII_SEG7_SYMBOL
173
174/* This set tries to map as close as possible to the symbolic characteristics
175 * of the ASCII character for maximum discrimination.
176 * For now this means all alpha chars are in lower case representations.
177 * (This for example facilitates the use of hex numbers with uppercase input.)
178 */
179#define MAP_ASCII7SEG_ALPHANUM_LC \
180 _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \
181 _MAP_33_47_ASCII_SEG7_SYMBOL \
182 _MAP_48_57_ASCII_SEG7_NUMERIC \
183 _MAP_58_64_ASCII_SEG7_SYMBOL \
184 _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \
185 _MAP_91_96_ASCII_SEG7_SYMBOL \
186 _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \
187 _MAP_123_126_ASCII_SEG7_SYMBOL
188
189#define SEG7_DEFAULT_MAP(_name) \
190 SEG7_CONVERSION_MAP(_name,MAP_ASCII7SEG_ALPHANUM)
191
192#endif /* MAP_TO_7SEGMENT_H */
193