/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Character line display core support * * Copyright (C) 2016 Imagination Technologies * Author: Paul Burton <[email protected]> * * Copyright (C) 2021 Glider bv */ #ifndef _LINEDISP_H #define _LINEDISP_H #include <linux/device.h> #include <linux/timer_types.h> #include <linux/map_to_7segment.h> #include <linux/map_to_14segment.h> struct linedisp; /** * enum linedisp_map_type - type of the character mapping * @LINEDISP_MAP_SEG7: Map characters to 7 segment display * @LINEDISP_MAP_SEG14: Map characters to 14 segment display */ enum linedisp_map_type { … }; /** * struct linedisp_map - character mapping * @type: type of the character mapping * @map: conversion character mapping * @size: size of the @map */ struct linedisp_map { … }; /** * struct linedisp_ops - character line display operations * @get_map_type: Function called to get the character mapping, if required * @update: Function called to update the display. This must not sleep! */ struct linedisp_ops { … }; /** * struct linedisp - character line display private data structure * @dev: the line display device * @timer: timer used to implement scrolling * @ops: character line display operations * @buf: pointer to the buffer for the string currently displayed * @message: the full message to display or scroll on the display * @num_chars: the number of characters that can be displayed * @message_len: the length of the @message string * @scroll_pos: index of the first character of @message currently displayed * @scroll_rate: scroll interval in jiffies * @id: instance id of this display */ struct linedisp { … }; int linedisp_register(struct linedisp *linedisp, struct device *parent, unsigned int num_chars, const struct linedisp_ops *ops); void linedisp_unregister(struct linedisp *linedisp); #endif /* LINEDISP_H */
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