/*      $NetBSD: clk_schmid.c,v 1.7 2024/08/18 20:47:17 christos Exp $  */

/*
* /src/NTP/ntp4-dev/libparse/clk_schmid.c,v 4.9 2005/04/16 17:32:10 kardel RELEASE_20050508_A
*
* clk_schmid.c,v 4.9 2005/04/16 17:32:10 kardel RELEASE_20050508_A
*
* Schmid clock support
* based on information and testing from Adam W. Feigin et. al (Swisstime iis.ethz.ch)
*
* Copyright (c) 1995-2015 by Frank Kardel <kardel <AT> ntp.org>
* Copyright (c) 1989-1994 by Frank Kardel, Friedrich-Alexander Universitaet Erlangen-Nuernberg, Germany
*
* 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.
* 3. Neither the name of the author nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* 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.
*
*/

#if HAVE_CONFIG_H
# include <config.h>
#endif

#if defined(REFCLOCK) && defined(CLOCK_PARSE) && defined(CLOCK_SCHMID)

#include "ntp_fp.h"
#include "ntp_unixtime.h"
#include "ntp_calendar.h"

#include "parse.h"

#ifndef PARSESTREAM
#include "ntp_stdlib.h"
#include <stdio.h>
#else
#include "sys/parsestreams.h"
extern int printf (const char *, ...);
#endif

/*
* Description courtesy of Adam W. Feigin et. al (Swisstime iis.ethz.ch)
*
* The command to Schmid's DCF77 clock is a single byte; each bit
* allows the user to select some part of the time string, as follows (the
* output for the lsb is sent first).
*
* Bit 0:       time in MEZ, 4 bytes *binary, not BCD*; hh.mm.ss.tenths
* Bit 1:       date 3 bytes *binary, not BCD: dd.mm.yy
* Bit 2:       week day, 1 byte (unused here)
* Bit 3:       time zone, 1 byte, 0=MET, 1=MEST. (unused here)
* Bit 4:       clock status, 1 byte,   0=time invalid,
*                                      1=time from crystal backup,
*                                      3=time from DCF77
* Bit 5:       transmitter status, 1 byte,
*                                      bit 0: backup antenna
*                                      bit 1: time zone change within 1h
*                                      bit 3,2: TZ 01=MEST, 10=MET
*                                      bit 4: leap second will be
*                                              added within one hour
*                                      bits 5-7: Zero
* Bit 6:       time in backup mode, units of 5 minutes (unused here)
*
*/
#define WS_TIME         0x01
#define WS_SIGNAL       0x02

#define WS_CALLBIT      0x01  /* "call bit" used to signalize irregularities in the control facilities */
#define WS_ANNOUNCE     0x02
#define WS_TZ           0x0c
#define   WS_MET        0x08
#define   WS_MEST       0x04
#define WS_LEAP         0x10

static parse_cvt_fnc_t cvt_schmid;
static parse_inp_fnc_t inp_schmid;

clockformat_t clock_schmid =
{
 inp_schmid,                   /* no input handling */
 cvt_schmid,                   /* Schmid conversion */
 0,                            /* not direct PPS monitoring */
 0,                            /* conversion configuration */
 "Schmid",                     /* Schmid receiver */
 12,                           /* binary data buffer */
 0,                            /* no private data (complete messages) */
};

/* parse_cvt_fnc_t */
static u_long
cvt_schmid(
          unsigned char *buffer,
          int            size,
          struct format *format,
          clocktime_t   *clock_time,
          void          *local
       )
{
       if ((size != 11) || (buffer[10] != (unsigned char)'\375'))
       {
               return CVT_NONE;
       }
       else
       {
               if (buffer[0] > 23 || buffer[1] > 59 || buffer[2] > 59 || buffer[3] >  9) /* Time */
               {
                       return CVT_FAIL|CVT_BADTIME;
               }
               else
                   if (buffer[4] <  1 || buffer[4] > 31 || buffer[5] <  1 || buffer[5] > 12
                       ||  buffer[6] > 99)
                   {
                           return CVT_FAIL|CVT_BADDATE;
                   }
                   else
                   {
                           clock_time->hour    = buffer[0];
                           clock_time->minute  = buffer[1];
                           clock_time->second  = buffer[2];
                           clock_time->usecond = buffer[3] * 100000;
                           clock_time->day     = buffer[4];
                           clock_time->month   = buffer[5];
                           clock_time->year    = buffer[6];

                           clock_time->flags   = 0;

                           switch (buffer[8] & WS_TZ)
                           {
                               case WS_MET:
                                   clock_time->utcoffset = -1*60*60;
                                   break;

                               case WS_MEST:
                                   clock_time->utcoffset = -2*60*60;
                                   clock_time->flags    |= PARSEB_DST;
                                   break;

                               default:
                                   return CVT_FAIL|CVT_BADFMT;
                           }

                           if (!(buffer[7] & WS_TIME))
                           {
                                   clock_time->flags |= PARSEB_POWERUP;
                           }

                           if (!(buffer[7] & WS_SIGNAL))
                           {
                                   clock_time->flags |= PARSEB_NOSYNC;
                           }

                           if (buffer[7] & WS_SIGNAL)
                           {
                                   if (buffer[8] & WS_CALLBIT)
                                   {
                                           clock_time->flags |= PARSEB_CALLBIT;
                                   }

                                   if (buffer[8] & WS_ANNOUNCE)
                                   {
                                           clock_time->flags |= PARSEB_ANNOUNCE;
                                   }

                                   if (buffer[8] & WS_LEAP)
                                   {
                                           clock_time->flags |= PARSEB_LEAPADD; /* default: DCF77 data format deficiency */
                                   }
                           }

                           clock_time->flags |= PARSEB_S_LEAP|PARSEB_S_CALLBIT;

                           return CVT_OK;
                   }
       }
}

/*
* parse_inp_fnc_t inp_schmid
*
* grab data from input stream
*/
static u_long
inp_schmid(
         parse_t      *parseio,
         char         ch,
         timestamp_t  *tstamp
         )
{
       unsigned int rtc;

       parseprintf(DD_PARSE, ("inp_schmid(0x%p, 0x%x, ...)\n", (void*)parseio, ch));

       switch ((uint8_t)ch)
       {
       case 0xFD:              /*  */
               parseprintf(DD_PARSE, ("inp_schmid: 0xFD seen\n"));
               if ((rtc = parse_addchar(parseio, ch)) == PARSE_INP_SKIP)
                       return parse_end(parseio);
               else
                       return rtc;

       default:
               return parse_addchar(parseio, ch);
       }
}

#else /* not (REFCLOCK && CLOCK_PARSE && CLOCK_SCHMID) */
NONEMPTY_TRANSLATION_UNIT
#endif /* not (REFCLOCK && CLOCK_PARSE && CLOCK_SCHMID) */

/*
* History:
*
* clk_schmid.c,v
* Revision 4.9  2005/04/16 17:32:10  kardel
* update copyright
*
* Revision 4.8  2004/11/14 15:29:41  kardel
* support PPSAPI, upgrade Copyright to Berkeley style
*
* Revision 4.5  1999/11/28 09:13:51  kardel
* RECON_4_0_98F
*
* Revision 4.4  1998/06/13 12:06:03  kardel
* fix SYSV clock name clash
*
* Revision 4.3  1998/06/12 15:22:29  kardel
* fix prototypes
*
* Revision 4.2  1998/06/12 09:13:26  kardel
* conditional compile macros fixed
* printf prototype
*
* Revision 4.1  1998/05/24 09:39:53  kardel
* implementation of the new IO handling model
*
* Revision 4.0  1998/04/10 19:45:31  kardel
* Start 4.0 release version numbering
*
* from V3 3.22 log info deleted 1998/04/11 kardel
*/

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