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

     /*      $OpenBSD: clock_subr.h,v 1.8 2022/10/12 13:39:50 kettenis Exp $ */
     /*      $NetBSD: clock_subr.h,v 1.2 1997/03/15 18:11:17 is Exp $        */
     
     /*-
      * Copyright (c) 1996 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Gordon W. Ross
     *
     * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
     */
    
    /*
     * Interface to time-of-day clock devices.
     *
     * todr_gettime: convert time-of-day clock into a `struct timeval'
     * todr_settime: set time-of-day clock from a `struct timeval'
     *
     * (this is probably not so useful:)
     * todr_setwen: provide a machine-dependent TOD clock write-enable callback
     *              function which takes one boolean argument:
     *                      1 to enable writes; 0 to disable writes.
     */
    struct todr_chip_handle {
            void    *cookie;        /* Device specific data */
            void    *bus_cookie;    /* Bus specific data */
    
            int     todr_quality;
            int     (*todr_gettime)(struct todr_chip_handle *, struct timeval *);
            int     (*todr_settime)(struct todr_chip_handle *, struct timeval *);
            int     (*todr_setwen)(struct todr_chip_handle *, int);
    };
    typedef struct todr_chip_handle *todr_chip_handle_t;
    
    #define todr_gettime(ct, t)     ((*(ct)->todr_gettime)(ct, t))
    #define todr_settime(ct, t)     ((*(ct)->todr_settime)(ct, t))
    #define todr_wenable(ct, v)     if ((ct)->todr_setwen) \
                                            ((*(ct)->todr_setwen)(ct, v))
    
    void    todr_attach(struct todr_chip_handle *);

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