/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Character line display core support * * Copyright (C) 2016 Imagination Technologies * Author: Paul Burton <paul.burton@mips.com> * * 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 */