1/* $NetBSD: fancontrol.c,v 1.3 2021/07/30 22:07:14 macallan Exp $ */
2
3/*-
4 * Copyright (c) 2021 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 1.3 2021/07/30 22:07:14 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 <sys/sysctl.h>
38#include <dev/sysmon/sysmonvar.h>
39
40#include <macppc/dev/fancontrolvar.h>
41#include "opt_fancontrol.h"
42
43#ifdef FANCONTROL_DEBUG
44#define DPRINTF printf
45#else
46#define DPRINTF while (0) printf
47#endif
48
49int
50fancontrol_adjust_zone(fancontrol_zone_t *z)
51{
52	int temp, i, speed, diff, step;
53
54	if (z->nfans <= 0)
55		return -1;
56
57	temp = sysmon_envsys_get_max_value(z->filter, true);
58	if (temp == 0) {
59		/* no sensor data - leave fan alone */
60		DPRINTF("nodata\n");
61		return -1;
62	}
63
64	if (z->Tmin < 30) z->Tmin = 30;
65	if (z->Tmin > 60) z->Tmin = 60;
66	if (z->Tmax > 95) z->Tmax = 95;
67	if (z->Tmax < (z->Tmin + 10)) z->Tmax = z->Tmin + 10;
68	temp = (temp - 273150000) / 1000000;
69	diff = temp - z->Tmin;
70	DPRINTF("%s %d %d\n", z->name, temp, z->Tmin);
71	if (diff < 0) diff = 0;
72	diff = (100 * diff) / (z->Tmax - z->Tmin);
73
74	/* now adjust each fan to the new speed */
75	for (i = 0; i < z->nfans; i++) {
76		step = (z->fans[i].max_rpm - z->fans[i].min_rpm) / 100;
77		speed = z->fans[i].min_rpm + diff * step;
78		DPRINTF("diff %d base %d %d sp %d\n",
79		    diff, z->fans[i].min_rpm, z->fans[i].max_rpm, speed);
80		z->set_rpm(z->cookie, z->fans[i].num, speed);
81	}
82	return 0;
83}
84
85int
86fancontrol_init_zone(fancontrol_zone_t *z, struct sysctlnode *me)
87{
88	struct sysctlnode *zone_node, *node;
89
90	if (z->nfans <= 0) return 0;
91
92	sysctl_createv(NULL, 0, NULL, (void *) &zone_node,
93	    CTLFLAG_READWRITE | CTLFLAG_OWNDESC,
94	    CTLTYPE_NODE, z->name, NULL,
95	    NULL, 0, NULL, 0,
96	    CTL_MACHDEP,
97	    me->sysctl_num,
98	    CTL_CREATE, CTL_EOL);
99
100	sysctl_createv(NULL, 0, NULL, (void *) &node,
101	    CTLFLAG_READWRITE | CTLFLAG_OWNDESC,
102	    CTLTYPE_INT, "Tmin", "minimum temperature",
103	    NULL, 0, (void *)&z->Tmin, 0,
104	    CTL_MACHDEP,
105	    me->sysctl_num,
106	    zone_node->sysctl_num,
107	    CTL_CREATE, CTL_EOL);
108
109	sysctl_createv(NULL, 0, NULL, (void *) &node,
110	    CTLFLAG_READWRITE | CTLFLAG_OWNDESC,
111	    CTLTYPE_INT, "Tmax", "maximum temperature",
112	    NULL, 0, (void *)&z->Tmax, 0,
113	    CTL_MACHDEP,
114	    me->sysctl_num,
115	    zone_node->sysctl_num,
116	    CTL_CREATE, CTL_EOL);
117
118	return 0;
119}
120