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7e76aece6f
Extract the character line display core support from the simple ASCII LCD driver for the MIPS Boston, Malta & SEAD3 development boards into its own subdriver, so it can be reused for other displays. As this moves the "message" device attribute in sysfs in a "linedisp.N" subdirectory, a symlink is added to preserve backwards compatibility. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Character line display core support
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*
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* Copyright (C) 2016 Imagination Technologies
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* Author: Paul Burton <paul.burton@mips.com>
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*
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* Copyright (C) 2021 Glider bv
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*/
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#ifndef _LINEDISP_H
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#define _LINEDISP_H
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/**
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* struct linedisp - character line display private data structure
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* @dev: the line display device
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* @timer: timer used to implement scrolling
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* @update: function called to update the display
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* @buf: pointer to the buffer for the string currently displayed
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* @message: the full message to display or scroll on the display
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* @num_chars: the number of characters that can be displayed
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* @message_len: the length of the @message string
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* @scroll_pos: index of the first character of @message currently displayed
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* @scroll_rate: scroll interval in jiffies
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*/
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struct linedisp {
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struct device dev;
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struct timer_list timer;
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void (*update)(struct linedisp *linedisp);
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char *buf;
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char *message;
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unsigned int num_chars;
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unsigned int message_len;
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unsigned int scroll_pos;
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unsigned int scroll_rate;
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};
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int linedisp_register(struct linedisp *linedisp, struct device *parent,
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unsigned int num_chars, char *buf,
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void (*update)(struct linedisp *linedisp));
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void linedisp_unregister(struct linedisp *linedisp);
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#endif /* LINEDISP_H */
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