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Diffstat (limited to 'include/arch/x86_64/linux/map_to_7segment.h')
| -rw-r--r-- | include/arch/x86_64/linux/map_to_7segment.h | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/include/arch/x86_64/linux/map_to_7segment.h b/include/arch/x86_64/linux/map_to_7segment.h new file mode 100644 index 00000000..26fd2aa8 --- /dev/null +++ b/include/arch/x86_64/linux/map_to_7segment.h @@ -0,0 +1,232 @@ +/* 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 */ |