fancontrol.c revision 1.1 
1/* $NetBSD: fancontrol.c,v 1.1 2021/07/27 23:38:42 macallan Exp $ */
2
3/*-
4 * Copyright (c) 2018 Michael Lorenz
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: fancontrol.c,v 1.1 2021/07/27 23:38:42 macallan Exp $");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/device.h>
35#include <sys/conf.h>
36#include <sys/bus.h>
37#include <dev/sysmon/sysmonvar.h>
38
39#include <macppc/dev/fancontrolvar.h>
40#include "opt_fancontrol.h"
41
42#ifdef FANCONTROL_DEBUG
43#define DPRINTF printf
44#else
45#define DPRINTF while (0) printf
46#endif
47
48int
49fancontrol_adjust_zone(fancontrol_zone_t *z)
50{
51	int temp, i, speed, diff, step;
52
53	if (z->nfans <= 0)
54		return -1;
55
56	temp = sysmon_envsys_get_max_value(z->filter, true);
57	if (temp == 0) {
58		/* no sensor data - leave fan alone */
59		DPRINTF("nodata\n");
60		return -1;
61	}
62
63	temp = (temp - 273150000) / 1000000;
64	diff = temp - z->Tmin;
65	DPRINTF("%s %d %d\n", z->name, temp, z->Tmin);
66	if (diff < 0) diff = 0;
67	diff = (100 * diff) / (z->Tmax - z->Tmin);
68
69	/* now adjust each fan to the new duty cycle */
70	for (i = 0; i < z->nfans; i++) {
71		step = (z->fans[i].max_rpm - z->fans[i].min_rpm) / 100;
72		speed = z->fans[i].min_rpm + diff * step;
73		DPRINTF("diff %d base %d %d sp %d\n", diff, z->fans[i].min_rpm, z->fans[i].max_rpm, speed);
74		z->set_rpm(z->cookie, z->fans[i].num, speed);
75	}
76	return 0;
77}
78