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

     /*      $NetBSD: clock_subr.h,v 1.30 2020/01/01 23:07:38 thorpej Exp $  */
     
     /*-
      * Copyright (c) 1996, 2020 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.
     */
    
    #ifndef _DEV_CLOCK_SUBR_H_
    #define _DEV_CLOCK_SUBR_H_
    
    #include <sys/clock.h>
    #include <sys/stdbool.h>
    
    /*
     * "POSIX time" to/from "YY/MM/DD/hh/mm/ss"
     */
    struct clock_ymdhms {
            uint64_t dt_year;
            uint8_t dt_mon;
            uint8_t dt_day;
            uint8_t dt_wday;        /* Day of week */
            uint8_t dt_hour;
            uint8_t dt_min;
            uint8_t dt_sec;
    };
    
    time_t  clock_ymdhms_to_secs(struct clock_ymdhms *);
    int     clock_secs_to_ymdhms(time_t, struct clock_ymdhms *);
    
    /*
     * BCD to binary and binary to BCD.
     */
    static __inline unsigned int
    bcdtobin(unsigned int bcd)
    {
            return ((bcd >> 4) & 0x0f) * 10 + (bcd & 0x0f);
    }
    
    static __inline unsigned int
    bintobcd(unsigned int bin)
    {
            return (((bin / 10) << 4) & 0xf0) | (bin % 10);
    }
    
    /*
     * 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 timeval;
    struct todr_chip_handle {
            void    *cookie;        /* Device specific data */
            void    *bus_cookie;    /* Bus specific data */
            time_t  base_time;      /* Base time (e.g. rootfs time) */
    
            int     (*todr_gettime)(struct todr_chip_handle *, struct timeval *);
            int     (*todr_settime)(struct todr_chip_handle *, struct timeval *);
            int     (*todr_gettime_ymdhms)(struct todr_chip_handle *,
                                    struct clock_ymdhms *);
            int     (*todr_settime_ymdhms)(struct todr_chip_handle *,
                                    struct clock_ymdhms *);
            int     (*todr_setwen)(struct todr_chip_handle *, int);
    
    };
    typedef struct todr_chip_handle *todr_chip_handle_t;
    
    void    todr_init(void);
    void    todr_attach(todr_chip_handle_t);
    void    todr_lock(void);
   void    todr_unlock(void);
   bool    todr_lock_owned(void);
   
   void    todr_set_systime(time_t base);
   void    todr_save_systime(void);
   
   #endif /* _DEV_CLOCK_SUBR_H_ */

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