| /* 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 */ |
