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