1 /*
2  * Character LCD driver for Linux
3  *
4  * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
5  * Copyright (C) 2016-2017 Glider bvba
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version
10  * 2 of the License, or (at your option) any later version.
11  */
12 
13 struct charlcd {
14 	const struct charlcd_ops *ops;
15 	const unsigned char *char_conv;	/* Optional */
16 
17 	int ifwidth;			/* 4-bit or 8-bit (default) */
18 	int height;
19 	int width;
20 	int bwidth;			/* Default set by charlcd_alloc() */
21 	int hwidth;			/* Default set by charlcd_alloc() */
22 
23 	void *drvdata;			/* Set by charlcd_alloc() */
24 };
25 
26 struct charlcd_ops {
27 	/* Required */
28 	void (*write_cmd)(struct charlcd *lcd, int cmd);
29 	void (*write_data)(struct charlcd *lcd, int data);
30 
31 	/* Optional */
32 	void (*write_cmd_raw4)(struct charlcd *lcd, int cmd);	/* 4-bit only */
33 	void (*clear_fast)(struct charlcd *lcd);
34 	void (*backlight)(struct charlcd *lcd, int on);
35 };
36 
37 struct charlcd *charlcd_alloc(unsigned int drvdata_size);
38 
39 int charlcd_register(struct charlcd *lcd);
40 int charlcd_unregister(struct charlcd *lcd);
41 
42 void charlcd_poke(struct charlcd *lcd);
43