The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/hd44780_subr.h

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    1 /* $NetBSD: hd44780_subr.h,v 1.1 2003/01/20 01:20:51 soren Exp $ */
    2 
    3 /*
    4  * Copyright (c) 2002 Dennis I. Chernoivanov
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 
   30 #ifndef _DEV_IC_HD44780_SUBR_H_
   31 #define _DEV_IC_HD44780_SUBR_H_
   32 
   33 /* IOCTL definitions */
   34 #define HLCD_DISPCTL            _IOW('h',   1, struct hd44780_dispctl)
   35 #define HLCD_RESET              _IO('h',    2)
   36 #define HLCD_CLEAR              _IO('h',    3)
   37 #define HLCD_CURSOR_LEFT        _IO('h',    4)
   38 #define HLCD_CURSOR_RIGHT       _IO('h',    5)
   39 #define HLCD_GET_CURSOR_POS     _IOR('h',   6, struct hd44780_io)
   40 #define HLCD_SET_CURSOR_POS     _IOW('h',   7, struct hd44780_io)
   41 #define HLCD_GETC               _IOR('h',   8, struct hd44780_io)
   42 #define HLCD_PUTC               _IOW('h',   9, struct hd44780_io)
   43 #define HLCD_SHIFT_LEFT         _IO('h',   10)
   44 #define HLCD_SHIFT_RIGHT        _IO('h',   11)
   45 #define HLCD_HOME               _IO('h',   12)
   46 #define HLCD_WRITE              _IOWR('h', 13, struct hd44780_io)
   47 #define HLCD_READ               _IOWR('h', 14, struct hd44780_io)
   48 #define HLCD_REDRAW             _IOW('h',  15, struct hd44780_io)
   49 #define HLCD_WRITE_INST         _IOW('h',  16, struct hd44780_io)
   50 #define HLCD_WRITE_DATA         _IOW('h',  17, struct hd44780_io)
   51 #define HLCD_GET_INFO           _IOR('h',  18, struct hd44780_info)
   52 
   53 struct hd44780_dispctl {
   54         u_char  display_on:1,
   55                 blink_on:1,
   56                 cursor_on:1;
   57 };
   58 
   59 struct hd44780_io {
   60         u_int8_t dat;
   61         u_int8_t len;
   62         u_int8_t buf[HD_MAX_CHARS];
   63 };
   64 
   65 struct hd44780_info {
   66         u_char  lines;
   67         u_char  phys_rows;
   68         u_char  virt_rows;
   69 
   70         u_char  is_wide:1,
   71                 is_bigfont:1,
   72                 kp_present:1;
   73 };
   74 
   75 #ifdef _KERNEL
   76 
   77 /* HLCD driver structure */
   78 struct hd44780_chip {
   79 #define HD_8BIT                 0x01    /* 8-bit if set, 4-bit otherwise */
   80 #define HD_MULTILINE            0x02    /* 2 lines if set, 1 otherwise */
   81 #define HD_BIGFONT              0x04    /* 5x10 if set, 5x8 otherwise */
   82 #define HD_KEYPAD               0x08    /* if set, keypad is connected */
   83         u_char sc_flags;
   84 
   85         u_char sc_rows;                 /* visible rows */
   86         u_char sc_vrows;                /* virtual rows (normally 40) */
   87         u_char sc_dev_ok;
   88 
   89         bus_space_tag_t sc_iot;
   90 
   91         bus_space_handle_t sc_ioir;     /* instruction register */
   92         bus_space_handle_t sc_iodr;     /* data register */
   93 
   94         /*
   95          * This one is here to make initialization generic. If 4-bit
   96          * connection is used, the device still starts as if it was
   97          * 8-bit connected, so a special care is needed for such case.
   98          * If set to NULL, normal 'sc_rwrite()' function will be used
   99          * during initialization.
  100          */
  101         void     (* sc_irwrite)(bus_space_tag_t, bus_space_handle_t, u_int8_t);
  102 
  103         /* Generic write/read byte entries. */
  104         void     (* sc_rwrite)(bus_space_tag_t, bus_space_handle_t, u_int8_t);
  105         u_int8_t (* sc_rread)(bus_space_tag_t, bus_space_handle_t);
  106 };
  107 
  108 #define hd44780_busy_wait(sc) \
  109         while((hd44780_ir_read(sc) & BUSY_FLAG) == BUSY_FLAG)
  110 
  111 #define hd44780_ir_write(sc, dat) \
  112         do {                                                            \
  113                 hd44780_busy_wait(sc);                                  \
  114                 (sc)->sc_rwrite((sc)->sc_iot, (sc)->sc_ioir, (dat));    \
  115         } while(0)
  116 
  117 #define hd44780_ir_read(sc) \
  118         (sc)->sc_rread((sc)->sc_iot, (sc)->sc_ioir)
  119 
  120 #define hd44780_dr_write(sc, dat) \
  121         (sc)->sc_rwrite((sc)->sc_iot, (sc)->sc_iodr, (dat))
  122 
  123 #define hd44780_dr_read(sc) \
  124         (sc)->sc_rread((sc)->sc_iot, (sc)->sc_iodr)
  125 
  126 void hd44780_attach_subr(struct hd44780_chip *);
  127 int  hd44780_ioctl_subr(struct hd44780_chip *, u_long, caddr_t);
  128 void hd44780_ddram_redraw(struct hd44780_chip *, struct hd44780_io *);
  129 
  130 #define HD_DDRAM_READ   0x0
  131 #define HD_DDRAM_WRITE  0x1
  132 int  hd44780_ddram_io(struct hd44780_chip *, struct hd44780_io *, u_char);
  133 
  134 #if defined(HD44780_STD_SHORT)
  135 void     hd44780_irwrite(bus_space_tag_t, bus_space_handle_t, u_int8_t);
  136 #endif
  137 
  138 #if defined(HD44780_STD_WIDE) || defined(HD44780_STD_SHORT)
  139 void     hd44780_rwrite(bus_space_tag_t, bus_space_handle_t, u_int8_t);
  140 u_int8_t hd44780_rread(bus_space_tag_t, bus_space_handle_t);
  141 #endif
  142 
  143 #endif /* _KERNEL */
  144 
  145 #endif /* _DEV_IC_HD44780_SUBR_H_ */

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