diff options
Diffstat (limited to 'contrib/ntp/ntpd/refclock_pcf.c')
| -rw-r--r-- | contrib/ntp/ntpd/refclock_pcf.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/contrib/ntp/ntpd/refclock_pcf.c b/contrib/ntp/ntpd/refclock_pcf.c new file mode 100644 index 0000000..c882404 --- /dev/null +++ b/contrib/ntp/ntpd/refclock_pcf.c @@ -0,0 +1,215 @@ +/* + * 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 <time.h> + +#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 clocks 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 2.2 is available + * at http://home.pages.de/~voegele/pcf.html. + */ + +/* + * Interface definitions + */ +#define DEVICE "/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 P((int, struct peer *)); +static void pcf_shutdown P((int, struct peer *)); +static void pcf_poll P((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[20]; + + /* + * Open device file for reading. + */ + (void)sprintf(device, DEVICE, unit); +#ifdef DEBUG + if (debug) + printf ("starting PCF with device %s\n",device); +#endif + if ((fd = open(device, O_RDONLY)) == -1) { + return (0); + } + + pp = peer->procptr; + pp->io.clock_recv = noentry; + pp->io.srcclock = (caddr_t)peer; + pp->io.datalen = 0; + pp->io.fd = fd; + + /* + * Initialize miscellaneous variables + */ + peer->precision = PRECISION; + pp->clockdesc = DESCRIPTION; + 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; + (void)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)) < sizeof(buf) || buf[0] != 9) { + refclock_report(peer, CEVNT_FAULT); + return; + } + + 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 = -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->usec = buf[16] * 31250; + if (buf[17] & 1) + pp->usec += 500000; + +#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->leap = LEAP_NOTINSYNC; + else + pp->leap = LEAP_NOWARNING; + refclock_receive(peer); +} +#else +int refclock_pcf_bs; +#endif /* REFCLOCK */ |
