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/clock_subr.h

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    1 /*      $NetBSD: clock_subr.h,v 1.20 2008/04/28 20:23:46 martin Exp $   */
    2 
    3 /*-
    4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Gordon W. Ross
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 #ifndef _DEV_CLOCK_SUBR_H_
   33 #define _DEV_CLOCK_SUBR_H_
   34 
   35 /*
   36  * "POSIX time" to/from "YY/MM/DD/hh/mm/ss"
   37  */
   38 struct clock_ymdhms {
   39         u_short dt_year;
   40         u_char dt_mon;
   41         u_char dt_day;
   42         u_char dt_wday; /* Day of week */
   43         u_char dt_hour;
   44         u_char dt_min;
   45         u_char dt_sec;
   46 };
   47 
   48 time_t  clock_ymdhms_to_secs(struct clock_ymdhms *);
   49 void    clock_secs_to_ymdhms(time_t, struct clock_ymdhms *);
   50 
   51 /*
   52  * BCD to binary and binary to BCD.
   53  */
   54 #define FROMBCD(x)      bcdtobin((x))
   55 #define TOBCD(x)        bintobcd((x))
   56 
   57 /* Some handy constants. */
   58 #define SECDAY          (24 * 60 * 60)
   59 #define SECYR           (SECDAY * 365)
   60 
   61 /* Traditional POSIX base year */
   62 #define POSIX_BASE_YEAR 1970
   63 
   64 /*
   65  * Interface to time-of-day clock devices.
   66  *
   67  * todr_gettime: convert time-of-day clock into a `struct timeval'
   68  * todr_settime: set time-of-day clock from a `struct timeval'
   69  *
   70  * (this is probably not so useful:)
   71  * todr_setwen: provide a machine-dependent TOD clock write-enable callback
   72  *              function which takes one boolean argument:
   73  *                      1 to enable writes; 0 to disable writes.
   74  */
   75 struct todr_chip_handle {
   76         void    *cookie;        /* Device specific data */
   77         void    *bus_cookie;    /* Bus specific data */
   78         time_t  base_time;      /* Base time (e.g. rootfs time) */
   79 
   80         int     (*todr_gettime)(struct todr_chip_handle *,
   81                                 volatile struct timeval *);
   82         int     (*todr_settime)(struct todr_chip_handle *,
   83                                 volatile struct timeval *);
   84         int     (*todr_gettime_ymdhms)(struct todr_chip_handle *,
   85                                 struct clock_ymdhms *);
   86         int     (*todr_settime_ymdhms)(struct todr_chip_handle *,
   87                                 struct clock_ymdhms *);
   88         int     (*todr_setwen)(struct todr_chip_handle *, int);
   89 
   90 };
   91 typedef struct todr_chip_handle *todr_chip_handle_t;
   92 
   93 #define todr_wenable(ct, v)     if ((ct)->todr_setwen) \
   94                                         ((*(ct)->todr_setwen)(ct, v))
   95 
   96 /*
   97  * Probably these should evolve into internal routines in kern_todr.c.
   98  */
   99 extern int todr_gettime(todr_chip_handle_t tch, volatile struct timeval *);
  100 extern int todr_settime(todr_chip_handle_t tch, volatile struct timeval *);
  101 
  102 /*
  103  * Machine-dependent function that machine-independent RTC drivers can
  104  * use to register their todr_chip_handle_t with inittodr()/resettodr().
  105  */
  106 void    todr_attach(todr_chip_handle_t);
  107 
  108 #endif /* _DEV_CLOCK_SUBR_H_ */

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