LXR linux/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
   9struct 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
  22struct 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
  33struct charlcd *charlcd_alloc(unsigned int drvdata_size);
  34void charlcd_free(struct charlcd *lcd);
  35
  36int charlcd_register(struct charlcd *lcd);
  37int charlcd_unregister(struct charlcd *lcd);
  38
  39void charlcd_poke(struct charlcd *lcd);
  40