180 lines
6.5 KiB
C
180 lines
6.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* Copyright (c) 2005 Henk Vergonet <Henk.Vergonet@gmail.com>
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*/
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#ifndef MAP_TO_7SEGMENT_H
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#define MAP_TO_7SEGMENT_H
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/* This file provides translation primitives and tables for the conversion
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* of (ASCII) characters to a 7-segments notation.
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*
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* The 7 segment's wikipedia notation below is used as standard.
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* See: https://en.wikipedia.org/wiki/Seven_segment_display
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*
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* Notation: +-a-+
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* f b
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* +-g-+
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* e c
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* +-d-+
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*
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* Usage:
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*
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* Register a map variable, and fill it with a character set:
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* static SEG7_DEFAULT_MAP(map_seg7);
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*
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*
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* Then use for conversion:
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* seg7 = map_to_seg7(&map_seg7, some_char);
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* ...
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*
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* In device drivers it is recommended, if required, to make the char map
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* accessible via the sysfs interface using the following scheme:
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*
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* static ssize_t map_seg7_show(struct device *dev,
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* struct device_attribute *attr, char *buf)
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* {
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* memcpy(buf, &map_seg7, sizeof(map_seg7));
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* return sizeof(map_seg7);
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* }
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* static ssize_t map_seg7_store(struct device *dev,
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* struct device_attribute *attr, const char *buf,
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* size_t cnt)
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* {
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* if(cnt != sizeof(map_seg7))
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* return -EINVAL;
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* memcpy(&map_seg7, buf, cnt);
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* return cnt;
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* }
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* static DEVICE_ATTR_RW(map_seg7);
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*
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* History:
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* 2005-05-31 RFC linux-kernel@vger.kernel.org
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*/
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#include <linux/errno.h>
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#define BIT_SEG7_A 0
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#define BIT_SEG7_B 1
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#define BIT_SEG7_C 2
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#define BIT_SEG7_D 3
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#define BIT_SEG7_E 4
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#define BIT_SEG7_F 5
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#define BIT_SEG7_G 6
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#define BIT_SEG7_RESERVED 7
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struct seg7_conversion_map {
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unsigned char table[128];
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};
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static __inline__ int map_to_seg7(struct seg7_conversion_map *map, int c)
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{
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return c >= 0 && c < sizeof(map->table) ? map->table[c] : -EINVAL;
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}
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#define SEG7_CONVERSION_MAP(_name, _map) \
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struct seg7_conversion_map _name = { .table = { _map } }
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/*
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* It is recommended to use a facility that allows user space to redefine
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* custom character sets for LCD devices. Please use a sysfs interface
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* as described above.
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*/
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#define MAP_TO_SEG7_SYSFS_FILE "map_seg7"
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/*******************************************************************************
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* ASCII conversion table
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******************************************************************************/
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#define _SEG7(l,a,b,c,d,e,f,g) \
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( a<<BIT_SEG7_A | b<<BIT_SEG7_B | c<<BIT_SEG7_C | d<<BIT_SEG7_D | \
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e<<BIT_SEG7_E | f<<BIT_SEG7_F | g<<BIT_SEG7_G )
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#define _MAP_0_32_ASCII_SEG7_NON_PRINTABLE \
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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,
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#define _MAP_33_47_ASCII_SEG7_SYMBOL \
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_SEG7('!',0,0,0,0,1,1,0), _SEG7('"',0,1,0,0,0,1,0), _SEG7('#',0,1,1,0,1,1,0),\
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_SEG7('$',1,0,1,1,0,1,1), _SEG7('%',0,0,1,0,0,1,0), _SEG7('&',1,0,1,1,1,1,1),\
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_SEG7('\'',0,0,0,0,0,1,0),_SEG7('(',1,0,0,1,1,1,0), _SEG7(')',1,1,1,1,0,0,0),\
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_SEG7('*',0,1,1,0,1,1,1), _SEG7('+',0,1,1,0,0,0,1), _SEG7(',',0,0,0,0,1,0,0),\
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_SEG7('-',0,0,0,0,0,0,1), _SEG7('.',0,0,0,0,1,0,0), _SEG7('/',0,1,0,0,1,0,1),
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#define _MAP_48_57_ASCII_SEG7_NUMERIC \
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_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),\
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_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),\
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_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),\
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_SEG7('9',1,1,1,1,0,1,1),
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#define _MAP_58_64_ASCII_SEG7_SYMBOL \
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_SEG7(':',0,0,0,1,0,0,1), _SEG7(';',0,0,0,1,0,0,1), _SEG7('<',1,0,0,0,0,1,1),\
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_SEG7('=',0,0,0,1,0,0,1), _SEG7('>',1,1,0,0,0,0,1), _SEG7('?',1,1,1,0,0,1,0),\
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_SEG7('@',1,1,0,1,1,1,1),
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#define _MAP_65_90_ASCII_SEG7_ALPHA_UPPR \
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_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),\
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_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),\
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_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),\
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_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),\
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_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),\
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_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),\
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_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),\
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_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),\
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_SEG7('Y',0,1,1,0,0,1,1), _SEG7('Z',1,1,0,1,1,0,1),
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#define _MAP_91_96_ASCII_SEG7_SYMBOL \
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_SEG7('[',1,0,0,1,1,1,0), _SEG7('\\',0,0,1,0,0,1,1),_SEG7(']',1,1,1,1,0,0,0),\
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_SEG7('^',1,1,0,0,0,1,0), _SEG7('_',0,0,0,1,0,0,0), _SEG7('`',0,1,0,0,0,0,0),
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#define _MAP_97_122_ASCII_SEG7_ALPHA_LOWER \
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_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),\
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_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),\
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_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),\
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_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),\
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_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),\
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_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),\
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_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),\
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_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),\
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_SEG7('y',0,1,1,1,0,1,1), _SEG7('Z',1,1,0,1,1,0,1),
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#define _MAP_123_126_ASCII_SEG7_SYMBOL \
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_SEG7('{',1,0,0,1,1,1,0), _SEG7('|',0,0,0,0,1,1,0), _SEG7('}',1,1,1,1,0,0,0),\
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_SEG7('~',1,0,0,0,0,0,0),
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/* Maps */
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/* This set tries to map as close as possible to the visible characteristics
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* of the ASCII symbol, lowercase and uppercase letters may differ in
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* presentation on the display.
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*/
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#define MAP_ASCII7SEG_ALPHANUM \
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_MAP_0_32_ASCII_SEG7_NON_PRINTABLE \
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_MAP_33_47_ASCII_SEG7_SYMBOL \
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_MAP_48_57_ASCII_SEG7_NUMERIC \
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_MAP_58_64_ASCII_SEG7_SYMBOL \
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_MAP_65_90_ASCII_SEG7_ALPHA_UPPR \
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_MAP_91_96_ASCII_SEG7_SYMBOL \
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_MAP_97_122_ASCII_SEG7_ALPHA_LOWER \
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_MAP_123_126_ASCII_SEG7_SYMBOL
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/* This set tries to map as close as possible to the symbolic characteristics
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* of the ASCII character for maximum discrimination.
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* For now this means all alpha chars are in lower case representations.
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* (This for example facilitates the use of hex numbers with uppercase input.)
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*/
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#define MAP_ASCII7SEG_ALPHANUM_LC \
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_MAP_0_32_ASCII_SEG7_NON_PRINTABLE \
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_MAP_33_47_ASCII_SEG7_SYMBOL \
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_MAP_48_57_ASCII_SEG7_NUMERIC \
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_MAP_58_64_ASCII_SEG7_SYMBOL \
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_MAP_97_122_ASCII_SEG7_ALPHA_LOWER \
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_MAP_91_96_ASCII_SEG7_SYMBOL \
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_MAP_97_122_ASCII_SEG7_ALPHA_LOWER \
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_MAP_123_126_ASCII_SEG7_SYMBOL
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#define SEG7_DEFAULT_MAP(_name) \
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SEG7_CONVERSION_MAP(_name,MAP_ASCII7SEG_ALPHANUM)
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#endif /* MAP_TO_7SEGMENT_H */
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