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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>
42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
/*
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* Character LCD driver for Linux
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*
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* Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
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* Copyright (C) 2016-2017 Glider bvba
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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struct charlcd {
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const struct charlcd_ops *ops;
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const unsigned char *char_conv; /* Optional */
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int ifwidth; /* 4-bit or 8-bit (default) */
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int height;
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int width;
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int bwidth; /* Default set by charlcd_alloc() */
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int hwidth; /* Default set by charlcd_alloc() */
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void *drvdata; /* Set by charlcd_alloc() */
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};
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struct charlcd_ops {
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/* Required */
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void (*write_cmd)(struct charlcd *lcd, int cmd);
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void (*write_data)(struct charlcd *lcd, int data);
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/* Optional */
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void (*write_cmd_raw4)(struct charlcd *lcd, int cmd); /* 4-bit only */
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void (*clear_fast)(struct charlcd *lcd);
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void (*backlight)(struct charlcd *lcd, int on);
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};
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struct charlcd *charlcd_alloc(unsigned int drvdata_size);
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int charlcd_register(struct charlcd *lcd);
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int charlcd_unregister(struct charlcd *lcd);
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void charlcd_poke(struct charlcd *lcd);
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