mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-01 16:14:13 +08:00
ac201479cc
In 4-bit mode, 8-bit commands and data are written using two raw writes to the data interface: high nibble first, low nibble last. This must be handled by the low-level driver. However, as we don't know in which mode (4-bit or 8-bit) nor 4-bit phase the LCD was left, initialization must always be handled using raw writes, and needs to configure the LCD for 8-bit mode first. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
/*
|
|
* Character LCD driver for Linux
|
|
*
|
|
* Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
|
|
* Copyright (C) 2016-2017 Glider bvba
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
struct charlcd {
|
|
const struct charlcd_ops *ops;
|
|
const unsigned char *char_conv; /* Optional */
|
|
|
|
int ifwidth; /* 4-bit or 8-bit (default) */
|
|
int height;
|
|
int width;
|
|
int bwidth; /* Default set by charlcd_alloc() */
|
|
int hwidth; /* Default set by charlcd_alloc() */
|
|
|
|
void *drvdata; /* Set by charlcd_alloc() */
|
|
};
|
|
|
|
struct charlcd_ops {
|
|
/* Required */
|
|
void (*write_cmd)(struct charlcd *lcd, int cmd);
|
|
void (*write_data)(struct charlcd *lcd, int data);
|
|
|
|
/* Optional */
|
|
void (*write_cmd_raw4)(struct charlcd *lcd, int cmd); /* 4-bit only */
|
|
void (*clear_fast)(struct charlcd *lcd);
|
|
void (*backlight)(struct charlcd *lcd, int on);
|
|
};
|
|
|
|
struct charlcd *charlcd_alloc(unsigned int drvdata_size);
|
|
|
|
int charlcd_register(struct charlcd *lcd);
|
|
int charlcd_unregister(struct charlcd *lcd);
|
|
|
|
void charlcd_poke(struct charlcd *lcd);
|