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Current File : /usr/include/linux/map_to_14segment.h
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
 * Copyright (C) 2021 Glider bv
 *
 * Based on include/uapi/linux/map_to_7segment.h:

 * Copyright (c) 2005 Henk Vergonet <Henk.Vergonet@gmail.com>
 */

#ifndef MAP_TO_14SEGMENT_H
#define MAP_TO_14SEGMENT_H

/* This file provides translation primitives and tables for the conversion
 * of (ASCII) characters to a 14-segments notation.
 *
 * The 14 segment's wikipedia notation below is used as standard.
 * See: https://en.wikipedia.org/wiki/Fourteen-segment_display
 *
 * Notation:	+---a---+
 *		|\  |  /|
 *		f h i j b
 *		|  \|/  |
 *		+-g1+-g2+
 *		|  /|\  |
 *		e k l m c
 *		|/  |  \|
 *		+---d---+
 *
 * Usage:
 *
 *   Register a map variable, and fill it with a character set:
 *	static SEG14_DEFAULT_MAP(map_seg14);
 *
 *
 *   Then use for conversion:
 *	seg14 = map_to_seg14(&map_seg14, 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_seg14_show(struct device *dev,
 *				 struct device_attribute *attr, char *buf)
 * {
 *	memcpy(buf, &map_seg14, sizeof(map_seg14));
 *	return sizeof(map_seg14);
 * }
 * static ssize_t map_seg14_store(struct device *dev,
 *				  struct device_attribute *attr,
 *				  const char *buf, size_t cnt)
 * {
 *	if (cnt != sizeof(map_seg14))
 *		return -EINVAL;
 *	memcpy(&map_seg14, buf, cnt);
 *	return cnt;
 * }
 * static DEVICE_ATTR_RW(map_seg14);
 */
#include <linux/errno.h>
#include <linux/types.h>

#include <asm/byteorder.h>

#define BIT_SEG14_A		0
#define BIT_SEG14_B		1
#define BIT_SEG14_C		2
#define BIT_SEG14_D		3
#define BIT_SEG14_E		4
#define BIT_SEG14_F		5
#define BIT_SEG14_G1		6
#define BIT_SEG14_G2		7
#define BIT_SEG14_H		8
#define BIT_SEG14_I		9
#define BIT_SEG14_J		10
#define BIT_SEG14_K		11
#define BIT_SEG14_L		12
#define BIT_SEG14_M		13
#define BIT_SEG14_RESERVED1	14
#define BIT_SEG14_RESERVED2	15

struct seg14_conversion_map {
	__be16 table[128];
};

static __inline__ int map_to_seg14(struct seg14_conversion_map *map, int c)
{
	if (c < 0 || c >= sizeof(map->table) / sizeof(map->table[0]))
		return -EINVAL;

	return __be16_to_cpu(map->table[c]);
}

#define SEG14_CONVERSION_MAP(_name, _map)	\
	struct seg14_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_SEG14_SYSFS_FILE	"map_seg14"

/*******************************************************************************
 * ASCII conversion table
 ******************************************************************************/

#define _SEG14(sym, a, b, c, d, e, f, g1, g2, h, j, k, l, m, n)	\
	__cpu_to_be16( a << BIT_SEG14_A  |  b << BIT_SEG14_B  |	\
		       c << BIT_SEG14_C  |  d << BIT_SEG14_D  |	\
		       e << BIT_SEG14_E  |  f << BIT_SEG14_F  |	\
		      g1 << BIT_SEG14_G1 | g2 << BIT_SEG14_G2 |	\
		       h << BIT_SEG14_H  |  j << BIT_SEG14_I  |	\
		       k << BIT_SEG14_J  |  l << BIT_SEG14_K  |	\
		       m << BIT_SEG14_L  |  n << BIT_SEG14_M )

#define _MAP_0_32_ASCII_SEG14_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_SEG14_SYMBOL				\
	_SEG14('!', 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),	\
	_SEG14('"', 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0),	\
	_SEG14('#', 0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0),	\
	_SEG14('$', 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0),	\
	_SEG14('%', 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0),	\
	_SEG14('&', 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1),	\
	_SEG14('\'',0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0),	\
	_SEG14('(', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1),	\
	_SEG14(')', 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0),	\
	_SEG14('*', 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1),	\
	_SEG14('+', 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0),	\
	_SEG14(',', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0),	\
	_SEG14('-', 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0),	\
	_SEG14('.', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1),	\
	_SEG14('/', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0),

#define _MAP_48_57_ASCII_SEG14_NUMERIC				\
	_SEG14('0', 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0),	\
	_SEG14('1', 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0),	\
	_SEG14('2', 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0),	\
	_SEG14('3', 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0),	\
	_SEG14('4', 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0),	\
	_SEG14('5', 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1),	\
	_SEG14('6', 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0),	\
	_SEG14('7', 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0),	\
	_SEG14('8', 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0),	\
	_SEG14('9', 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0),

#define _MAP_58_64_ASCII_SEG14_SYMBOL				\
	_SEG14(':', 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0),	\
	_SEG14(';', 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0),	\
	_SEG14('<', 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1),	\
	_SEG14('=', 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0),	\
	_SEG14('>', 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0),	\
	_SEG14('?', 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0),	\
	_SEG14('@', 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0),

#define _MAP_65_90_ASCII_SEG14_ALPHA_UPPER			\
	_SEG14('A', 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0),	\
	_SEG14('B', 1, 1, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0),	\
	_SEG14('C', 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0),	\
	_SEG14('D', 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0),	\
	_SEG14('E', 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0),	\
	_SEG14('F', 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0),	\
	_SEG14('G', 1, 0, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0),	\
	_SEG14('H', 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0),	\
	_SEG14('I', 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0),	\
	_SEG14('J', 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),	\
	_SEG14('K', 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1),	\
	_SEG14('L', 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0),	\
	_SEG14('M', 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0),	\
	_SEG14('N', 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1),	\
	_SEG14('O', 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0),	\
	_SEG14('P', 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0),	\
	_SEG14('Q', 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1),	\
	_SEG14('R', 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1),	\
	_SEG14('S', 1, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0),	\
	_SEG14('T', 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0),	\
	_SEG14('U', 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0),	\
	_SEG14('V', 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0),	\
	_SEG14('W', 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 1),	\
	_SEG14('X', 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1),	\
	_SEG14('Y', 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0),	\
	_SEG14('Z', 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0),

#define _MAP_91_96_ASCII_SEG14_SYMBOL				\
	_SEG14('[', 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0),	\
	_SEG14('\\',0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1),	\
	_SEG14(']', 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),	\
	_SEG14('^', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1),	\
	_SEG14('_', 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),	\
	_SEG14('`', 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0),

#define _MAP_97_122_ASCII_SEG14_ALPHA_LOWER			\
	_SEG14('a', 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0),	\
	_SEG14('b', 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1),	\
	_SEG14('c', 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0),	\
	_SEG14('d', 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0),	\
	_SEG14('e', 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0),	\
	_SEG14('f', 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0),	\
	_SEG14('g', 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0),	\
	_SEG14('h', 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0),	\
	_SEG14('i', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0),	\
	_SEG14('j', 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0),	\
	_SEG14('k', 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1),	\
	_SEG14('l', 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0),	\
	_SEG14('m', 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0),	\
	_SEG14('n', 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0),	\
	_SEG14('o', 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0),	\
	_SEG14('p', 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0),	\
	_SEG14('q', 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0),	\
	_SEG14('r', 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0),	\
	_SEG14('s', 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1),	\
	_SEG14('t', 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0),	\
	_SEG14('u', 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0),	\
	_SEG14('v', 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0),	\
	_SEG14('w', 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1),	\
	_SEG14('x', 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 1),	\
	_SEG14('y', 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0),	\
	_SEG14('z', 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0),

#define _MAP_123_126_ASCII_SEG14_SYMBOL				\
	_SEG14('{', 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0),	\
	_SEG14('|', 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0),	\
	_SEG14('}', 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1),	\
	_SEG14('~', 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0),

/* Maps */
#define MAP_ASCII14SEG_ALPHANUM			\
	_MAP_0_32_ASCII_SEG14_NON_PRINTABLE	\
	_MAP_33_47_ASCII_SEG14_SYMBOL		\
	_MAP_48_57_ASCII_SEG14_NUMERIC		\
	_MAP_58_64_ASCII_SEG14_SYMBOL		\
	_MAP_65_90_ASCII_SEG14_ALPHA_UPPER	\
	_MAP_91_96_ASCII_SEG14_SYMBOL		\
	_MAP_97_122_ASCII_SEG14_ALPHA_LOWER	\
	_MAP_123_126_ASCII_SEG14_SYMBOL

#define SEG14_DEFAULT_MAP(_name)		\
	SEG14_CONVERSION_MAP(_name, MAP_ASCII14SEG_ALPHANUM)

#endif	/* MAP_TO_14SEGMENT_H */

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