1bbf5a2156
While there is no compilation error, strictly speaking the compiler should know about used types beforehand. Provide a forward declaration for struct charlcd_ops before using it in struct charlcd. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
107 lines
3.2 KiB
C
107 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Character LCD driver for Linux
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*
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* Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
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* Copyright (C) 2016-2017 Glider bvba
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*/
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#ifndef _CHARLCD_H
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#define _CHARLCD_H
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#define LCD_FLAG_B 0x0004 /* Blink on */
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#define LCD_FLAG_C 0x0008 /* Cursor on */
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#define LCD_FLAG_D 0x0010 /* Display on */
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#define LCD_FLAG_F 0x0020 /* Large font mode */
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#define LCD_FLAG_N 0x0040 /* 2-rows mode */
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#define LCD_FLAG_L 0x0080 /* Backlight enabled */
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enum charlcd_onoff {
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CHARLCD_OFF = 0,
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CHARLCD_ON,
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};
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enum charlcd_shift_dir {
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CHARLCD_SHIFT_LEFT,
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CHARLCD_SHIFT_RIGHT,
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};
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enum charlcd_fontsize {
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CHARLCD_FONTSIZE_SMALL,
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CHARLCD_FONTSIZE_LARGE,
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};
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enum charlcd_lines {
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CHARLCD_LINES_1,
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CHARLCD_LINES_2,
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};
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struct charlcd_ops;
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struct charlcd {
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const struct charlcd_ops *ops;
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const unsigned char *char_conv; /* Optional */
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int height;
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int width;
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/* Contains the LCD X and Y offset */
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struct {
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unsigned long x;
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unsigned long y;
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} addr;
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void *drvdata;
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};
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/**
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* struct charlcd_ops - Functions used by charlcd. Drivers have to implement
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* these.
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* @backlight: Turn backlight on or off. Optional.
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* @print: Print one character to the display at current cursor position.
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* The buffered cursor position is advanced by charlcd. The cursor should not
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* wrap to the next line at the end of a line.
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* @gotoxy: Set cursor to x, y. The x and y values to set the cursor to are
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* previously set in addr.x and addr.y by charlcd.
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* @home: Set cursor to 0, 0. The values in addr.x and addr.y are set to 0, 0 by
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* charlcd prior to calling this function.
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* @clear_display: Clear the whole display and set the cursor to 0, 0. The
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* values in addr.x and addr.y are set to 0, 0 by charlcd after to calling this
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* function.
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* @init_display: Initialize the display.
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* @shift_cursor: Shift cursor left or right one position.
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* @shift_display: Shift whole display content left or right.
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* @display: Turn display on or off.
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* @cursor: Turn cursor on or off.
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* @blink: Turn cursor blink on or off.
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* @lines: One or two lines.
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* @redefine_char: Redefine the actual pixel matrix of character.
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*/
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struct charlcd_ops {
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void (*backlight)(struct charlcd *lcd, enum charlcd_onoff on);
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int (*print)(struct charlcd *lcd, int c);
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int (*gotoxy)(struct charlcd *lcd, unsigned int x, unsigned int y);
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int (*home)(struct charlcd *lcd);
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int (*clear_display)(struct charlcd *lcd);
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int (*init_display)(struct charlcd *lcd);
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int (*shift_cursor)(struct charlcd *lcd, enum charlcd_shift_dir dir);
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int (*shift_display)(struct charlcd *lcd, enum charlcd_shift_dir dir);
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int (*display)(struct charlcd *lcd, enum charlcd_onoff on);
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int (*cursor)(struct charlcd *lcd, enum charlcd_onoff on);
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int (*blink)(struct charlcd *lcd, enum charlcd_onoff on);
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int (*fontsize)(struct charlcd *lcd, enum charlcd_fontsize size);
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int (*lines)(struct charlcd *lcd, enum charlcd_lines lines);
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int (*redefine_char)(struct charlcd *lcd, char *esc);
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};
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void charlcd_backlight(struct charlcd *lcd, enum charlcd_onoff on);
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struct charlcd *charlcd_alloc(void);
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void charlcd_free(struct charlcd *lcd);
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int charlcd_register(struct charlcd *lcd);
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int charlcd_unregister(struct charlcd *lcd);
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void charlcd_poke(struct charlcd *lcd);
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#endif /* CHARLCD_H */
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