FreeBSD/Linux Kernel Cross Reference
sys/dev/iicbus/iic.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * 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.
     *
     * $FreeBSD$
     *
     */
    #ifndef __IIC_H
    #define __IIC_H
    
    #include <sys/ioccom.h>
    
    /* Designed to be compatible with linux's struct i2c_msg */
    struct iic_msg
    {
            uint16_t        slave;
            uint16_t        flags;
    #define IIC_M_WR        0       /* Fake flag for write */
    #define IIC_M_RD        0x0001  /* read vs write */
    #define IIC_M_NOSTOP    0x0002  /* do not send a I2C stop after message */
    #define IIC_M_NOSTART   0x0004  /* do not send a I2C start before message */
            uint16_t        len;    /* msg length */
            uint8_t *       buf;
    };
    
    struct iiccmd {
            u_char slave;
            int count;
            int last;
            char *buf;
    };
    
    struct iic_rdwr_data {
            struct iic_msg *msgs;
            uint32_t nmsgs;
    };
    
    #define IIC_RDRW_MAX_MSGS       42
    
    #define I2CSTART        _IOW('i', 1, struct iiccmd)     /* start condition */
    #define I2CSTOP         _IO('i', 2)                     /* stop condition */
    #define I2CRSTCARD      _IOW('i', 3, struct iiccmd)     /* reset the card */
    #define I2CWRITE        _IOW('i', 4, struct iiccmd)     /* send data */
    #define I2CREAD         _IOW('i', 5, struct iiccmd)     /* receive data */
    #define I2CRDWR         _IOW('i', 6, struct iic_rdwr_data)      /* General read/write interface */
    #define I2CRPTSTART     _IOW('i', 7, struct iiccmd)     /* repeated start */
    #define I2CSADDR        _IOW('i', 8, uint8_t)           /* set slave address for future I/O */
    
    #endif

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