include/misc/charlcd.h

   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 struct charlcd {
  10         const struct charlcd_ops *ops;
  11         const unsigned char *char_conv; /* Optional */
  12
  13         int ifwidth;                    /* 4-bit or 8-bit (default) */
  14         int height;
  15         int width;
  16         int bwidth;                     /* Default set by charlcd_alloc() */
  17         int hwidth;                     /* Default set by charlcd_alloc() */
  18
  19         void *drvdata;                  /* Set by charlcd_alloc() */
  20 };
  21
  22 struct charlcd_ops {
  23         /* Required */
  24         void (*write_cmd)(struct charlcd *lcd, int cmd);
  25         void (*write_data)(struct charlcd *lcd, int data);
  26
  27         /* Optional */
  28         void (*write_cmd_raw4)(struct charlcd *lcd, int cmd);   /* 4-bit only */
  29         void (*clear_fast)(struct charlcd *lcd);
  30         void (*backlight)(struct charlcd *lcd, int on);
  31 };
  32
  33 struct charlcd *charlcd_alloc(unsigned int drvdata_size);
  34 void charlcd_free(struct charlcd *lcd);
  35
  36 int charlcd_register(struct charlcd *lcd);
  37 int charlcd_unregister(struct charlcd *lcd);
  38
  39 void charlcd_poke(struct charlcd *lcd);