Quelle map_to_14segment.h Sprache: C

/* 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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