FreeBSD/Linux Kernel Cross Reference
sys/dev/iicbus/iicbb_if.m

     #-
     # Copyright (c) 1998 Nicolas Souchu
     # All rights reserved.
     #
     # Redistribution and use in source and binary forms, with or without
     # modification, are permitted provided that the following conditions
     # are met:
     # 1. Redistributions of source code must retain the above copyright
     #    notice, this list of conditions and the following disclaimer.
    # 2. Redistributions in binary form must reproduce the above copyright
    #    notice, this list of conditions and the following disclaimer in the
    #    documentation and/or other materials provided with the distribution.
    #
    # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
    # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    # ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
    # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    # SUCH DAMAGE.
    #
    # $FreeBSD$
    #
    
    #include <sys/bus.h>
    
    INTERFACE iicbb;
    
    #
    # Default implementation of optional methods
    #
    CODE {
            static int
            null_pre_xfer(device_t dev)
            {
                    return 0;
            }
    
            static void
            null_post_xfer(device_t dev)
    
            {
            }
    
            static int
            null_callback(device_t dev, int index, caddr_t data)
            {
                    return 0;
            }
    };
    
    #
    # iicbus callback
    #
    METHOD int callback {
            device_t dev;
            int index;
            caddr_t data;
    } DEFAULT null_callback;
    
    #
    # Prepare device for I2C transfer
    #
    METHOD int pre_xfer {
            device_t dev;
    } DEFAULT null_pre_xfer;
    
    #
    # Cleanup device after I2C transfer
    #
    METHOD void post_xfer {
            device_t dev;
    } DEFAULT null_post_xfer;
    
    #
    # Set I2C bus data line
    #
    METHOD void setsda {
            device_t dev;
            int val;
    };
    
    #
    # Set I2C bus clock line
    #
    METHOD void setscl {
            device_t dev;
            int val;
    };
    
    #
    # Get I2C bus data line
    #
    #
    METHOD int getsda {
           device_t dev;
   };
   
   #
   # Get I2C bus clock line
   #
   #
   METHOD int getscl {
           device_t dev;
   };
   
   #
   # Reset interface
   #
   METHOD int reset {
           device_t dev;
           u_char speed;
           u_char addr;
           u_char *oldaddr;
   };

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