include/misc/charlcd.h

   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);