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drivers
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auxdisplay
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charlcd.h

charlcd.h 1.1 KB
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  1. /* SPDX-License-Identifier: GPL-2.0-or-later */
    2. 

  2. /*
    3. 

  3.  * Character LCD driver for Linux
    4. 

  4.  *
    5. 

  5.  * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
    6. 

  6.  * Copyright (C) 2016-2017 Glider bvba
    7. 

  7.  */
    8. 

  8. 

  9. #ifndef _CHARLCD_H
    10. 

  10. #define _CHARLCD_H
    11. 

  11. 

  12. struct charlcd {
    13. 

  13. 	const struct charlcd_ops *ops;
    14. 

  14. 	const unsigned char *char_conv;	/* Optional */
    15. 

  15. 

  16. 	int ifwidth;			/* 4-bit or 8-bit (default) */
    17. 

  17. 	int height;
    18. 

  18. 	int width;
    19. 

  19. 	int bwidth;			/* Default set by charlcd_alloc() */
    20. 

  20. 	int hwidth;			/* Default set by charlcd_alloc() */
    21. 

  21. 

  22. 	void *drvdata;			/* Set by charlcd_alloc() */
    23. 

  23. };
    24. 

  24. 

  25. struct charlcd_ops {
    26. 

  26. 	/* Required */
    27. 

  27. 	void (*write_cmd)(struct charlcd *lcd, int cmd);
    28. 

  28. 	void (*write_data)(struct charlcd *lcd, int data);
    29. 

  29. 

  30. 	/* Optional */
    31. 

  31. 	void (*write_cmd_raw4)(struct charlcd *lcd, int cmd);	/* 4-bit only */
    32. 

  32. 	void (*clear_fast)(struct charlcd *lcd);
    33. 

  33. 	void (*backlight)(struct charlcd *lcd, int on);
    34. 

  34. };
    35. 

  35. 

  36. struct charlcd *charlcd_alloc(unsigned int drvdata_size);
    37. 

  37. void charlcd_free(struct charlcd *lcd);
    38. 

  38. 

  39. int charlcd_register(struct charlcd *lcd);
    40. 

  40. int charlcd_unregister(struct charlcd *lcd);
    41. 

  41. 

  42. void charlcd_poke(struct charlcd *lcd);
    43. 

  43. 

  44. #endif /* CHARLCD_H */
    45. 

  45.