/* $NetBSD: fancontrol.c,v 1.3 2021/07/30 22:07:14 macallan Exp $ */
/*-
* Copyright (c) 2021 Michael Lorenz
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fancontrol.c,v 1.3 2021/07/30 22:07:14 macallan Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/sysctl.h>
#include <dev/sysmon/sysmonvar.h>
#include <macppc/dev/fancontrolvar.h>
#include "opt_fancontrol.h"
#ifdef FANCONTROL_DEBUG
#define DPRINTF printf
#else
#define DPRINTF while (0) printf
#endif
int
fancontrol_adjust_zone(fancontrol_zone_t *z)
{
int temp, i, speed, diff, step;
if (z->nfans <= 0)
return -1;
temp = sysmon_envsys_get_max_value(z->filter, true);
if (temp == 0) {
/* no sensor data - leave fan alone */
DPRINTF("nodata\n");
return -1;
}
if (z->Tmin < 30) z->Tmin = 30;
if (z->Tmin > 60) z->Tmin = 60;
if (z->Tmax > 95) z->Tmax = 95;
if (z->Tmax < (z->Tmin + 10)) z->Tmax = z->Tmin + 10;
temp = (temp - 273150000) / 1000000;
diff = temp - z->Tmin;
DPRINTF("%s %d %d\n", z->name, temp, z->Tmin);
if (diff < 0) diff = 0;
diff = (100 * diff) / (z->Tmax - z->Tmin);
/* now adjust each fan to the new speed */
for (i = 0; i < z->nfans; i++) {
step = (z->fans[i].max_rpm - z->fans[i].min_rpm) / 100;
speed = z->fans[i].min_rpm + diff * step;
DPRINTF("diff %d base %d %d sp %d\n",
diff, z->fans[i].min_rpm, z->fans[i].max_rpm, speed);
z->set_rpm(z->cookie, z->fans[i].num, speed);
}
return 0;
}
int
fancontrol_init_zone(fancontrol_zone_t *z, struct sysctlnode *me)
{
struct sysctlnode *zone_node, *node;
if (z->nfans <= 0) return 0;
sysctl_createv(NULL, 0, NULL, (void *) &zone_node,
CTLFLAG_READWRITE | CTLFLAG_OWNDESC,
CTLTYPE_NODE, z->name, NULL,
NULL, 0, NULL, 0,
CTL_MACHDEP,
me->sysctl_num,
CTL_CREATE, CTL_EOL);
sysctl_createv(NULL, 0, NULL, (void *) &node,
CTLFLAG_READWRITE | CTLFLAG_OWNDESC,
CTLTYPE_INT, "Tmin", "minimum temperature",
NULL, 0, (void *)&z->Tmin, 0,
CTL_MACHDEP,
me->sysctl_num,
zone_node->sysctl_num,
CTL_CREATE, CTL_EOL);
sysctl_createv(NULL, 0, NULL, (void *) &node,
CTLFLAG_READWRITE | CTLFLAG_OWNDESC,
CTLTYPE_INT, "Tmax", "maximum temperature",
NULL, 0, (void *)&z->Tmax, 0,
CTL_MACHDEP,
me->sysctl_num,
zone_node->sysctl_num,
CTL_CREATE, CTL_EOL);
return 0;
}