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193 lines
7.2 KiB
193 lines
7.2 KiB
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ |
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/* |
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* Copyright (c) 2005 Henk Vergonet <[email protected]> |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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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 [email protected] |
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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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