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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 <[email protected]>
- *
- * 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 */
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