1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Character LCD driver for Linux 4 * 5 * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu> 6 * Copyright (C) 2016-2017 Glider bvba 7 */ 8 9 #ifndef _CHARLCD_H 10 #define _CHARLCD_H 11 12 enum charlcd_onoff { 13 CHARLCD_OFF = 0, 14 CHARLCD_ON, 15 }; 16 17 struct charlcd { 18 const struct charlcd_ops *ops; 19 const unsigned char *char_conv; /* Optional */ 20 21 int ifwidth; /* 4-bit or 8-bit (default) */ 22 int height; 23 int width; 24 int bwidth; /* Default set by charlcd_alloc() */ 25 int hwidth; /* Default set by charlcd_alloc() */ 26 27 void *drvdata; /* Set by charlcd_alloc() */ 28 }; 29 30 struct charlcd_ops { 31 /* Required */ 32 void (*write_cmd)(struct charlcd *lcd, int cmd); 33 void (*write_data)(struct charlcd *lcd, int data); 34 35 /* Optional */ 36 void (*write_cmd_raw4)(struct charlcd *lcd, int cmd); /* 4-bit only */ 37 void (*clear_fast)(struct charlcd *lcd); 38 void (*backlight)(struct charlcd *lcd, enum charlcd_onoff on); 39 }; 40 41 struct charlcd *charlcd_alloc(unsigned int drvdata_size); 42 void charlcd_free(struct charlcd *lcd); 43 44 int charlcd_register(struct charlcd *lcd); 45 int charlcd_unregister(struct charlcd *lcd); 46 47 void charlcd_poke(struct charlcd *lcd); 48 49 #endif /* CHARLCD_H */ 50