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/*
* refclock_pcf - clock driver for the Conrad parallel port radio clock
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#if defined(REFCLOCK) && defined(CLOCK_PCF)
#include "ntpd.h"
#include "ntp_io.h"
#include "ntp_refclock.h"
#include "ntp_calendar.h"
#include "ntp_stdlib.h"
/*
* This driver supports the parallel port radio clock sold by Conrad
* Electronic under order numbers 967602 and 642002.
*
* It requires that the local timezone be CET/CEST and that the pcfclock
* device driver be installed. A device driver for Linux is available at
* http://home.pages.de/~voegele/pcf.html. Information about a FreeBSD
* driver is available at http://schumann.cx/pcfclock/.
*/
/*
* Interface definitions
*/
#define DEVICE "/dev/pcfclocks/%d"
#define OLDDEVICE "/dev/pcfclock%d"
#define PRECISION (-1) /* precision assumed (about 0.5 s) */
#define REFID "PCF"
#define DESCRIPTION "Conrad parallel port radio clock"
#define LENPCF 18 /* timecode length */
/*
* Function prototypes
*/
static int pcf_start (int, struct peer *);
static void pcf_shutdown (int, struct peer *);
static void pcf_poll (int, struct peer *);
/*
* Transfer vector
*/
struct refclock refclock_pcf = {
pcf_start, /* start up driver */
pcf_shutdown, /* shut down driver */
pcf_poll, /* transmit poll message */
noentry, /* not used */
noentry, /* initialize driver (not used) */
noentry, /* not used */
NOFLAGS /* not used */
};
/*
* pcf_start - open the device and initialize data for processing
*/
static int
pcf_start(
int unit,
struct peer *peer
)
{
struct refclockproc *pp;
int fd;
char device[128];
/*
* Open device file for reading.
*/
snprintf(device, sizeof(device), DEVICE, unit);
fd = open(device, O_RDONLY);
if (fd == -1) {
snprintf(device, sizeof(device), OLDDEVICE, unit);
fd = open(device, O_RDONLY);
}
#ifdef DEBUG
if (debug)
printf ("starting PCF with device %s\n",device);
#endif
if (fd == -1) {
return (0);
}
pp = peer->procptr;
pp->io.clock_recv = noentry;
pp->io.srcclock = peer;
pp->io.datalen = 0;
pp->io.fd = fd;
/*
* Initialize miscellaneous variables
*/
peer->precision = PRECISION;
pp->clockdesc = DESCRIPTION;
/* one transmission takes 172.5 milliseconds since the radio clock
transmits 69 bits with a period of 2.5 milliseconds per bit */
pp->fudgetime1 = 0.1725;
memcpy((char *)&pp->refid, REFID, 4);
return (1);
}
/*
* pcf_shutdown - shut down the clock
*/
static void
pcf_shutdown(
int unit,
struct peer *peer
)
{
struct refclockproc *pp;
pp = peer->procptr;
if (NULL != pp)
close(pp->io.fd);
}
/*
* pcf_poll - called by the transmit procedure
*/
static void
pcf_poll(
int unit,
struct peer *peer
)
{
struct refclockproc *pp;
char buf[LENPCF];
struct tm tm, *tp;
time_t t;
pp = peer->procptr;
buf[0] = 0;
if (read(pp->io.fd, buf, sizeof(buf)) < (ssize_t)sizeof(buf) || buf[0] != 9) {
refclock_report(peer, CEVNT_FAULT);
return;
}
ZERO(tm);
tm.tm_mday = buf[11] * 10 + buf[10];
tm.tm_mon = buf[13] * 10 + buf[12] - 1;
tm.tm_year = buf[15] * 10 + buf[14];
tm.tm_hour = buf[7] * 10 + buf[6];
tm.tm_min = buf[5] * 10 + buf[4];
tm.tm_sec = buf[3] * 10 + buf[2];
tm.tm_isdst = (buf[8] & 1) ? 1 : (buf[8] & 2) ? 0 : -1;
/*
* Y2K convert the 2-digit year
*/
if (tm.tm_year < 99)
tm.tm_year += 100;
t = mktime(&tm);
if (t == (time_t) -1) {
refclock_report(peer, CEVNT_BADTIME);
return;
}
#if defined(__GLIBC__) && defined(_BSD_SOURCE)
if ((tm.tm_isdst > 0 && tm.tm_gmtoff != 7200)
|| (tm.tm_isdst == 0 && tm.tm_gmtoff != 3600)
|| tm.tm_isdst < 0) {
#ifdef DEBUG
if (debug)
printf ("local time zone not set to CET/CEST\n");
#endif
refclock_report(peer, CEVNT_BADTIME);
return;
}
#endif
pp->lencode = strftime(pp->a_lastcode, BMAX, "%Y %m %d %H %M %S", &tm);
#if defined(_REENTRANT) || defined(_THREAD_SAFE)
tp = gmtime_r(&t, &tm);
#else
tp = gmtime(&t);
#endif
if (!tp) {
refclock_report(peer, CEVNT_FAULT);
return;
}
get_systime(&pp->lastrec);
pp->polls++;
pp->year = tp->tm_year + 1900;
pp->day = tp->tm_yday + 1;
pp->hour = tp->tm_hour;
pp->minute = tp->tm_min;
pp->second = tp->tm_sec;
pp->nsec = buf[16] * 31250000;
if (buf[17] & 1)
pp->nsec += 500000000;
#ifdef DEBUG
if (debug)
printf ("pcf%d: time is %04d/%02d/%02d %02d:%02d:%02d UTC\n",
unit, pp->year, tp->tm_mon + 1, tp->tm_mday, pp->hour,
pp->minute, pp->second);
#endif
if (!refclock_process(pp)) {
refclock_report(peer, CEVNT_BADTIME);
return;
}
record_clock_stats(&peer->srcadr, pp->a_lastcode);
if ((buf[1] & 1) && !(pp->sloppyclockflag & CLK_FLAG2))
pp->leap = LEAP_NOTINSYNC;
else
pp->leap = LEAP_NOWARNING;
pp->lastref = pp->lastrec;
refclock_receive(peer);
}
#else
int refclock_pcf_bs;
#endif /* REFCLOCK */
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