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/* $OpenBSD: sensors.c,v 1.16 2006/05/29 05:20:42 henning 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 <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ntpd.h"
#define SENSORS_MAX 255
#define _PATH_DEV_HOTPLUG "/dev/hotplug"
void sensor_probe(int);
void sensor_add(struct sensor *);
void sensor_remove(struct ntp_sensor *);
struct ntpd_conf *conf;
void
sensor_init(struct ntpd_conf *c)
{
conf = c;
TAILQ_INIT(&conf->ntp_sensors);
}
void
sensor_scan(void)
{
int i;
for (i = 0; i < SENSORS_MAX; i++)
sensor_probe(i);
}
void
sensor_probe(int id)
{
int mib[3];
size_t len;
struct sensor sensor;
mib[0] = CTL_HW;
mib[1] = HW_SENSORS;
mib[2] = id;
len = sizeof(sensor);
if (sysctl(mib, 3, &sensor, &len, NULL, 0) == -1) {
if (errno != ENOENT)
log_warn("sensor_probe sysctl");
return;
}
if (sensor.type == SENSOR_TIMEDELTA)
sensor_add(&sensor);
}
void
sensor_add(struct sensor *sensor)
{
struct ntp_sensor *s;
struct ntp_conf_sensor *cs;
/* check wether it is already there */
TAILQ_FOREACH(s, &conf->ntp_sensors, entry)
if (!strcmp(s->device, sensor->device))
return;
/* check wether it is requested in the config file */
for (cs = TAILQ_FIRST(&conf->ntp_conf_sensors); cs != NULL &&
strcmp(cs->device, sensor->device) && 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 = time(NULL);
s->weight = cs->weight;
if ((s->device = strdup(sensor->device)) == NULL)
fatal("sensor_add strdup");
s->sensorid = sensor->num;
TAILQ_INSERT_TAIL(&conf->ntp_sensors, s, entry);
log_debug("sensor %s added", s->device);
}
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)
{
struct sensor sensor;
int mib[3];
size_t len;
s->next = time(NULL) + SENSOR_QUERY_INTERVAL;
if (s->update.rcvd < time(NULL) - SENSOR_DATA_MAXAGE)
s->update.good = 0;
mib[0] = CTL_HW;
mib[1] = HW_SENSORS;
mib[2] = s->sensorid;
len = sizeof(sensor);
if (sysctl(mib, 3, &sensor, &len, NULL, 0) == -1) {
if (errno == ENOENT)
sensor_remove(s);
else
log_warn("sensor_query sysctl");
return;
}
if (sensor.flags & SENSOR_FINVALID ||
sensor.status != SENSOR_S_OK)
return;
if (sensor.type != SENSOR_TIMEDELTA ||
strcmp(sensor.device, s->device)) {
sensor_remove(s);
return;
}
if (sensor.tv.tv_sec == s->update.rcvd) /* already seen */
return;
/* 1st 4 bytes of the desc are required to be the clock src code */
bcopy(sensor.desc, &s->update.status.refid,
sizeof(s->update.status.refid));
s->update.offset = 0 - (float)sensor.value / 1000000000.0;
s->update.status.stratum = 0; /* increased when sent out */
s->update.status.rootdelay = 0;
s->update.status.rootdispersion = 0;
s->update.status.reftime = sensor.tv.tv_sec;
s->update.rcvd = sensor.tv.tv_sec;
s->update.good = 1;
log_debug("sensor %s: offset %f", s->device, s->update.offset);
}
int
sensor_hotplugfd(void)
{
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("fnctl F_GETFL");
flags |= O_NONBLOCK;
if ((flags = fcntl(fd, F_SETFL, flags)) == -1)
fatal("fnctl F_SETFL");
return (fd);
}
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, "sensor"))
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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