linux-stable/drivers/auxdisplay/charlcd.h

/* 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

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 {
	void (*clear_fast)(struct charlcd *lcd);
	void (*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 */