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/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Miroslav Lichvar 2009
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
**********************************************************************
=======================================================================
PPSAPI refclock driver.
*/
#include "config.h"
#include "refclock.h"
#if FEAT_PPS
#if defined(HAVE_SYS_TIMEPPS_H)
#include <sys/timepps.h>
#elif defined(HAVE_TIMEPPS_H)
#include <timepps.h>
#endif
#include "logging.h"
#include "memory.h"
#include "util.h"
struct pps_instance {
pps_handle_t handle;
pps_seq_t last_seq;
int edge_clear;
};
static int pps_initialise(RCL_Instance instance) {
const char *options[] = {"clear", NULL};
pps_handle_t handle;
pps_params_t params;
struct pps_instance *pps;
int fd, edge_clear, mode;
char *path;
RCL_CheckDriverOptions(instance, options);
path = RCL_GetDriverParameter(instance);
edge_clear = RCL_GetDriverOption(instance, "clear") ? 1 : 0;
fd = open(path, O_RDWR);
if (fd < 0) {
LOG_FATAL("Could not open %s : %s", path, strerror(errno));
return 0;
}
UTI_FdSetCloexec(fd);
if (time_pps_create(fd, &handle) < 0) {
LOG_FATAL("time_pps_create() failed on %s : %s", path, strerror(errno));
return 0;
}
if (time_pps_getcap(handle, &mode) < 0) {
LOG_FATAL("time_pps_getcap() failed on %s : %s", path, strerror(errno));
return 0;
}
if (time_pps_getparams(handle, ¶ms) < 0) {
LOG_FATAL("time_pps_getparams() failed on %s : %s", path, strerror(errno));
return 0;
}
if (!edge_clear) {
if (!(mode & PPS_CAPTUREASSERT)) {
LOG_FATAL("CAPTUREASSERT not supported on %s", path);
return 0;
}
params.mode |= PPS_CAPTUREASSERT;
params.mode &= ~PPS_CAPTURECLEAR;
} else {
if (!(mode & PPS_CAPTURECLEAR)) {
LOG_FATAL("CAPTURECLEAR not supported on %s", path);
return 0;
}
params.mode |= PPS_CAPTURECLEAR;
params.mode &= ~PPS_CAPTUREASSERT;
}
if (time_pps_setparams(handle, ¶ms) < 0) {
LOG_FATAL("time_pps_setparams() failed on %s : %s", path, strerror(errno));
return 0;
}
pps = MallocNew(struct pps_instance);
pps->handle = handle;
pps->last_seq = 0;
pps->edge_clear = edge_clear;
RCL_SetDriverData(instance, pps);
return 1;
}
static void pps_finalise(RCL_Instance instance)
{
struct pps_instance *pps;
pps = (struct pps_instance *)RCL_GetDriverData(instance);
time_pps_destroy(pps->handle);
Free(pps);
}
static int pps_poll(RCL_Instance instance)
{
struct pps_instance *pps;
struct timespec ts;
pps_info_t pps_info;
pps_seq_t seq;
pps = (struct pps_instance *)RCL_GetDriverData(instance);
ts.tv_sec = 0;
ts.tv_nsec = 0;
if (time_pps_fetch(pps->handle, PPS_TSFMT_TSPEC, &pps_info, &ts) < 0) {
LOG(LOGS_ERR, "time_pps_fetch() failed : %s", strerror(errno));
return 0;
}
if (!pps->edge_clear) {
seq = pps_info.assert_sequence;
ts = pps_info.assert_timestamp;
} else {
seq = pps_info.clear_sequence;
ts = pps_info.clear_timestamp;
}
if (seq == pps->last_seq || UTI_IsZeroTimespec(&ts)) {
DEBUG_LOG("PPS sample ignored seq=%lu ts=%s",
(unsigned long)seq, UTI_TimespecToString(&ts));
return 0;
}
pps->last_seq = seq;
return RCL_AddPulse(instance, &ts, 1.0e-9 * ts.tv_nsec);
}
RefclockDriver RCL_PPS_driver = {
pps_initialise,
pps_finalise,
pps_poll
};
#else
RefclockDriver RCL_PPS_driver = { NULL, NULL, NULL };
#endif
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