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/* $OpenBSD: sensors.c,v 1.46 2012/09/20 12:43:16 patrick Exp $ */
/*
* Copyright (c) 2006 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/sensors.h>
#include <sys/sysctl.h>
#include <sys/device.h>
#include <sys/hotplug.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ntpd.h"
#define MAXDEVNAMLEN 16
#define _PATH_DEV_HOTPLUG "/dev/hotplug"
int sensor_probe(int, char *, struct sensor *);
void sensor_add(int, char *);
void sensor_remove(struct ntp_sensor *);
void sensor_update(struct ntp_sensor *);
void
sensor_init(void)
{
TAILQ_INIT(&conf->ntp_sensors);
}
int
sensor_scan(void)
{
int i, n, err;
char d[MAXDEVNAMLEN];
struct sensor s;
n = 0;
for (i = 0; ; i++)
if ((err = sensor_probe(i, d, &s))) {
if (err == 0)
continue;
if (err == -1) /* no further sensors */
break;
sensor_add(i, d);
n++;
}
return n;
}
/*
* 1 = time sensor!
* 0 = sensor exists... but is not a time sensor
* -1: no sensor here, and no further sensors after this
*/
int
sensor_probe(int devid, char *dxname, struct sensor *sensor)
{
int mib[5];
size_t slen, sdlen;
struct sensordev sensordev;
mib[0] = CTL_HW;
mib[1] = HW_SENSORS;
mib[2] = devid;
mib[3] = SENSOR_TIMEDELTA;
mib[4] = 0;
sdlen = sizeof(sensordev);
if (sysctl(mib, 3, &sensordev, &sdlen, NULL, 0) == -1) {
if (errno == ENXIO)
return (0);
if (errno == ENOENT)
return (-1);
log_warn("sensor_probe sysctl");
}
if (sensordev.maxnumt[SENSOR_TIMEDELTA] == 0)
return (0);
strlcpy(dxname, sensordev.xname, MAXDEVNAMLEN);
slen = sizeof(*sensor);
if (sysctl(mib, 5, sensor, &slen, NULL, 0) == -1) {
if (errno != ENOENT)
log_warn("sensor_probe sysctl");
return (0);
}
return (1);
}
void
sensor_add(int sensordev, char *dxname)
{
struct ntp_sensor *s;
struct ntp_conf_sensor *cs;
/* check whether it is already there */
TAILQ_FOREACH(s, &conf->ntp_sensors, entry)
if (!strcmp(s->device, dxname))
return;
/* check whether it is requested in the config file */
for (cs = TAILQ_FIRST(&conf->ntp_conf_sensors); cs != NULL &&
strcmp(cs->device, dxname) && strcmp(cs->device, "*");
cs = TAILQ_NEXT(cs, entry))
; /* nothing */
if (cs == NULL)
return;
if ((s = calloc(1, sizeof(*s))) == NULL)
fatal("sensor_add calloc");
s->next = getmonotime();
s->weight = cs->weight;
s->correction = cs->correction;
s->stratum = cs->stratum - 1;
if ((s->device = strdup(dxname)) == NULL)
fatal("sensor_add strdup");
s->sensordevid = sensordev;
if (cs->refstr == NULL)
memcpy(&s->refid, "HARD", sizeof(s->refid));
else {
s->refid = 0;
strncpy((char *)&s->refid, cs->refstr, sizeof(s->refid));
}
TAILQ_INSERT_TAIL(&conf->ntp_sensors, s, entry);
log_debug("sensor %s added (weight %d, correction %.6f, refstr %.4s, "
"stratum %d)", s->device, s->weight, s->correction / 1e6,
&s->refid, s->stratum);
}
void
sensor_remove(struct ntp_sensor *s)
{
TAILQ_REMOVE(&conf->ntp_sensors, s, entry);
free(s->device);
free(s);
}
void
sensor_query(struct ntp_sensor *s)
{
char dxname[MAXDEVNAMLEN];
struct sensor sensor;
if (conf->settime)
s->next = getmonotime() + SENSOR_QUERY_INTERVAL_SETTIME;
else
s->next = getmonotime() + SENSOR_QUERY_INTERVAL;
/* rcvd is walltime here, monotime in client.c. not used elsewhere */
if (s->update.rcvd < time(NULL) - SENSOR_DATA_MAXAGE)
s->update.good = 0;
if (!sensor_probe(s->sensordevid, dxname, &sensor)) {
sensor_remove(s);
return;
}
if (sensor.flags & SENSOR_FINVALID ||
sensor.status != SENSOR_S_OK)
return;
if (strcmp(dxname, s->device)) {
sensor_remove(s);
return;
}
if (sensor.tv.tv_sec == s->last) /* already seen */
return;
s->last = sensor.tv.tv_sec;
/*
* TD = device time
* TS = system time
* sensor.value = TS - TD in ns
* if value is positive, system time is ahead
*/
s->offsets[s->shift].offset = (sensor.value / -1e9) - getoffset() +
(s->correction / 1e6);
s->offsets[s->shift].rcvd = sensor.tv.tv_sec;
s->offsets[s->shift].good = 1;
s->offsets[s->shift].status.send_refid = s->refid;
/* stratum increased when sent out */
s->offsets[s->shift].status.stratum = s->stratum;
s->offsets[s->shift].status.rootdelay = 0;
s->offsets[s->shift].status.rootdispersion = 0;
s->offsets[s->shift].status.reftime = sensor.tv.tv_sec;
s->offsets[s->shift].status.synced = 1;
log_debug("sensor %s: offset %f", s->device,
s->offsets[s->shift].offset);
if (++s->shift >= SENSOR_OFFSETS) {
s->shift = 0;
sensor_update(s);
}
}
void
sensor_update(struct ntp_sensor *s)
{
struct ntp_offset **offsets;
int i;
if ((offsets = calloc(SENSOR_OFFSETS, sizeof(struct ntp_offset *))) ==
NULL)
fatal("calloc sensor_update");
for (i = 0; i < SENSOR_OFFSETS; i++)
offsets[i] = &s->offsets[i];
qsort(offsets, SENSOR_OFFSETS, sizeof(struct ntp_offset *),
offset_compare);
i = SENSOR_OFFSETS / 2;
memcpy(&s->update, offsets[i], sizeof(s->update));
if (SENSOR_OFFSETS % 2 == 0) {
s->update.offset =
(offsets[i - 1]->offset + offsets[i]->offset) / 2;
}
free(offsets);
log_debug("sensor update %s: offset %f", s->device, s->update.offset);
priv_adjtime();
}
int
sensor_hotplugfd(void)
{
#ifdef notyet
int fd, flags;
if ((fd = open(_PATH_DEV_HOTPLUG, O_RDONLY, 0)) == -1) {
log_warn("open %s", _PATH_DEV_HOTPLUG);
return (-1);
}
if ((flags = fcntl(fd, F_GETFL, 0)) == -1)
fatal("fcntl F_GETFL");
flags |= O_NONBLOCK;
if ((flags = fcntl(fd, F_SETFL, flags)) == -1)
fatal("fcntl F_SETFL");
return (fd);
#else
return (-1);
#endif
}
void
sensor_hotplugevent(int fd)
{
struct hotplug_event he;
ssize_t n;
do {
if ((n = read(fd, &he, sizeof(he))) == -1 &&
errno != EINTR && errno != EAGAIN)
fatal("sensor_hotplugevent read");
if (n == sizeof(he))
switch (he.he_type) {
case HOTPLUG_DEVAT:
if (he.he_devclass == DV_DULL &&
!strcmp(he.he_devname, "sensordev"))
sensor_scan();
break;
default: /* ignore */
break;
}
else if (n > 0)
fatal("sensor_hotplugevent: short read");
} while (n > 0 || (n == -1 && errno == EINTR));
}
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