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4ce026d5f4
Always allocate a buffer for the currently displayed characters. It makes the line display API simpler. Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Tested-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Character line display core support
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*
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* Copyright (C) 2016 Imagination Technologies
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* Author: Paul Burton <paul.burton@mips.com>
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*
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* Copyright (C) 2021 Glider bv
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*/
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#ifndef _LINEDISP_H
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#define _LINEDISP_H
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#include <linux/device.h>
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#include <linux/timer_types.h>
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#include <linux/map_to_7segment.h>
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#include <linux/map_to_14segment.h>
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struct linedisp;
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/**
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* enum linedisp_map_type - type of the character mapping
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* @LINEDISP_MAP_SEG7: Map characters to 7 segment display
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* @LINEDISP_MAP_SEG14: Map characters to 14 segment display
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*/
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enum linedisp_map_type {
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LINEDISP_MAP_SEG7,
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LINEDISP_MAP_SEG14,
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};
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/**
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* struct linedisp_map - character mapping
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* @type: type of the character mapping
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* @map: conversion character mapping
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* @size: size of the @map
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*/
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struct linedisp_map {
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enum linedisp_map_type type;
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union {
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struct seg7_conversion_map seg7;
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struct seg14_conversion_map seg14;
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} map;
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unsigned int size;
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};
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/**
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* struct linedisp_ops - character line display operations
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* @get_map_type: Function called to get the character mapping, if required
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* @update: Function called to update the display. This must not sleep!
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*/
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struct linedisp_ops {
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int (*get_map_type)(struct linedisp *linedisp);
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void (*update)(struct linedisp *linedisp);
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};
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/**
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* struct linedisp - character line display private data structure
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* @dev: the line display device
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* @timer: timer used to implement scrolling
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* @ops: character line display operations
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* @buf: pointer to the buffer for the string currently displayed
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* @message: the full message to display or scroll on the display
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* @num_chars: the number of characters that can be displayed
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* @message_len: the length of the @message string
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* @scroll_pos: index of the first character of @message currently displayed
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* @scroll_rate: scroll interval in jiffies
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* @id: instance id of this display
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*/
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struct linedisp {
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struct device dev;
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struct timer_list timer;
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const struct linedisp_ops *ops;
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struct linedisp_map *map;
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char *buf;
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char *message;
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unsigned int num_chars;
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unsigned int message_len;
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unsigned int scroll_pos;
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unsigned int scroll_rate;
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unsigned int id;
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};
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int linedisp_register(struct linedisp *linedisp, struct device *parent,
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unsigned int num_chars, const struct linedisp_ops *ops);
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void linedisp_unregister(struct linedisp *linedisp);
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#endif /* LINEDISP_H */
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