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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Character LCD driver for Linux
*
* Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
* Copyright (C) 2016-2017 Glider bvba
*/
#ifndef _CHARLCD_H
#define _CHARLCD_H
#define LCD_FLAG_B 0x0004 /* Blink on */
#define LCD_FLAG_C 0x0008 /* Cursor on */
#define LCD_FLAG_D 0x0010 /* Display on */
#define LCD_FLAG_F 0x0020 /* Large font mode */
#define LCD_FLAG_N 0x0040 /* 2-rows mode */
#define LCD_FLAG_L 0x0080 /* Backlight enabled */
enum charlcd_onoff {
CHARLCD_OFF = 0,
CHARLCD_ON,
};
struct charlcd {
const struct charlcd_ops *ops;
const unsigned char *char_conv; /* Optional */
int height;
int width;
/* Contains the LCD X and Y offset */
struct {
unsigned long x;
unsigned long y;
} addr;
void *drvdata;
};
/**
* struct charlcd_ops - Functions used by charlcd. Drivers have to implement
* these.
* @clear_fast: Clear the whole display and set cursor to position 0, 0.
* Optional.
* @backlight: Turn backlight on or off. Optional.
* @print: Print one character to the display at current cursor position.
* The buffered cursor position is advanced by charlcd. The cursor should not
* wrap to the next line at the end of a line.
* @gotoxy: Set cursor to x, y. The x and y values to set the cursor to are
* previously set in addr.x and addr.y by charlcd.
* @home: Set cursor to 0, 0. The values in addr.x and addr.y are set to 0, 0 by
* charlcd prior to calling this function.
* @clear_display: Again clear the whole display, set the cursor to 0, 0. The
* values in addr.x and addr.y are set to 0, 0 by charlcd prior to calling this
* function.
* @init_display: Initialize the display.
*/
struct charlcd_ops {
void (*clear_fast)(struct charlcd *lcd);
void (*backlight)(struct charlcd *lcd, enum charlcd_onoff on);
int (*print)(struct charlcd *lcd, int c);
int (*gotoxy)(struct charlcd *lcd);
int (*home)(struct charlcd *lcd);
int (*clear_display)(struct charlcd *lcd);
int (*init_display)(struct charlcd *lcd);
};
void charlcd_backlight(struct charlcd *lcd, enum charlcd_onoff on);
struct charlcd *charlcd_alloc(void);
void charlcd_free(struct charlcd *lcd);
int charlcd_register(struct charlcd *lcd);
int charlcd_unregister(struct charlcd *lcd);
void charlcd_poke(struct charlcd *lcd);
#endif /* CHARLCD_H */
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