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/* SPDX-License-Identifier: GPL-2.0-or-later */
* Character line display core support
* Copyright (C) 2016 Imagination Technologies
* Author: Paul Burton <>
* Copyright (C) 2021 Glider bv
#ifndef _LINEDISP_H
#define _LINEDISP_H
* struct linedisp - character line display private data structure
* @dev: the line display device
* @timer: timer used to implement scrolling
* @update: function called to update the display
* @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
struct linedisp {
struct device dev;
struct timer_list timer;
void (*update)(struct linedisp *linedisp);
char *buf;
char *message;
unsigned int num_chars;
unsigned int message_len;
unsigned int scroll_pos;
unsigned int scroll_rate;
int linedisp_register(struct linedisp *linedisp, struct device *parent,
unsigned int num_chars, char *buf,
void (*update)(struct linedisp *linedisp));
void linedisp_unregister(struct linedisp *linedisp);
#endif /* LINEDISP_H */