drivers/auxdisplay/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 #ifndef _CHARLCD_H
  10 #define _CHARLCD_H
  11
  12 struct charlcd {
  13         const struct charlcd_ops *ops;
  14         const unsigned char *char_conv; /* Optional */
  15
  16         int ifwidth;                    /* 4-bit or 8-bit (default) */
  17         int height;
  18         int width;
  19         int bwidth;                     /* Default set by charlcd_alloc() */
  20         int hwidth;                     /* Default set by charlcd_alloc() */
  21
  22         void *drvdata;                  /* Set by charlcd_alloc() */
  23 };
  24
  25 struct charlcd_ops {
  26         /* Required */
  27         void (*write_cmd)(struct charlcd *lcd, int cmd);
  28         void (*write_data)(struct charlcd *lcd, int data);
  29
  30         /* Optional */
  31         void (*write_cmd_raw4)(struct charlcd *lcd, int cmd);   /* 4-bit only */
  32         void (*clear_fast)(struct charlcd *lcd);
  33         void (*backlight)(struct charlcd *lcd, int on);
  34 };
  35
  36 struct charlcd *charlcd_alloc(unsigned int drvdata_size);
  37 void charlcd_free(struct charlcd *lcd);
  38
  39 int charlcd_register(struct charlcd *lcd);
  40 int charlcd_unregister(struct charlcd *lcd);
  41
  42 void charlcd_poke(struct charlcd *lcd);
  43
  44 #endif /* CHARLCD_H */