FreeBSD/Linux Kernel Cross Reference
sys/dev/ow/ow.h

     /*-
      * Copyright (c) 2015 M. Warner Losh <imp@FreeBSD.org>
      *
      * 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 unmodified, 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 ``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 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 DEV_OW_OW_H
    #define DEV_OW_OW_H 1
    
    enum ow_device_ivars {
            OW_IVAR_FAMILY,
            OW_IVAR_ROMID
    };
    
    #define OW_ACCESSOR(var, ivar, type)                                    \
            __BUS_ACCESSOR(ow, var, OW, ivar, type);
    
    OW_ACCESSOR(family,     FAMILY, uint8_t)
    OW_ACCESSOR(romid,      ROMID, uint8_t *)
    
    #undef OW_ACCSSOR
    
    /*
     * The following likely should be in the own.h file, but needs to be here to
     * avoid recursive issues when defining the own_if.m interface.
     */
    
    /*
     * Generalized command structure for a 1wire bus transaction. Not all possible
     * transactions on the 1wire bus can be represented here (a notable exception
     * being both the search ROM commands), but most of them can be, allowing for
     * general transactions from userland. A lower-level interface to the link
     * layer is also provided.
     */
    #define MAX_ROM         10
    #define MAX_XPT         32
    #define MAX_READ        32
    struct ow_cmd 
    {
            uint32_t        flags;          /* Various flags */
    #define OW_FLAG_OVERDRIVE       1       /* Send xpt stuff overdrive speed */
    #define OW_FLAG_READ_BIT        2       /* Read a single bit after xpt_cmd */
            uint8_t         rom_len;        /* Number of ROM bytes to send */
            uint8_t         rom_cmd[MAX_ROM]; /* Rom command to send */
            uint8_t         rom_read_len;   /* Number of bytes to read */
            uint8_t         rom_read[MAX_ROM]; /* Extra bytes read */
            uint8_t         xpt_len;        /* Total transport bytes to send */
            uint8_t         xpt_cmd[MAX_XPT]; /* Device specific command to send, if flagged */
            uint8_t         xpt_read_len;   /* Number of bytes to read after */
            uint8_t         xpt_read[MAX_READ]; /* Buffer for read bytes */
    };
    
    typedef uint64_t romid_t;
    
    #endif /* DEV_OW_OW_H */

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