2 * Copyright (c) 2009-2011 Nathan Whitehorn
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/kernel.h>
33 #include <sys/mutex.h>
34 #include <sys/systm.h>
36 #include <sys/types.h>
37 #include <sys/kthread.h>
38 #include <sys/malloc.h>
39 #include <sys/reboot.h>
40 #include <sys/sysctl.h>
41 #include <sys/queue.h>
43 #include "powermac_thermal.h"
45 /* A 10 second timer for spinning down fans. */
46 #define FAN_HYSTERESIS_TIMER 10
48 static void fan_management_proc(void);
49 static void pmac_therm_manage_fans(void);
51 static struct proc *pmac_them_proc;
52 static int enable_pmac_thermal = 1;
54 static struct kproc_desc pmac_therm_kp = {
60 SYSINIT(pmac_therm_setup, SI_SUB_KTHREAD_IDLE, SI_ORDER_ANY, kproc_start,
62 SYSCTL_INT(_machdep, OID_AUTO, manage_fans, CTLFLAG_RW | CTLFLAG_TUN,
63 &enable_pmac_thermal, 1, "Enable automatic fan management");
64 static MALLOC_DEFINE(M_PMACTHERM, "pmactherm", "Powermac Thermal Management");
70 SLIST_ENTRY(pmac_fan_le) entries;
73 struct pmac_therm *sensor;
75 #define MAX_CRITICAL_COUNT 6
77 SLIST_ENTRY(pmac_sens_le) entries;
79 static SLIST_HEAD(pmac_fans, pmac_fan_le) fans = SLIST_HEAD_INITIALIZER(fans);
80 static SLIST_HEAD(pmac_sensors, pmac_sens_le) sensors =
81 SLIST_HEAD_INITIALIZER(sensors);
84 fan_management_proc(void)
86 /* Nothing to manage? */
87 if (SLIST_EMPTY(&fans))
91 pmac_therm_manage_fans();
92 pause("pmac_therm", hz);
97 pmac_therm_manage_fans(void)
99 struct pmac_sens_le *sensor;
100 struct pmac_fan_le *fan;
101 int average_excess, max_excess_zone, frac_excess;
103 int nsens, nsens_zone;
106 if (!enable_pmac_thermal)
109 /* Read all the sensors */
110 SLIST_FOREACH(sensor, &sensors, entries) {
111 temp = sensor->sensor->read(sensor->sensor);
112 if (temp > 0) /* Use the previous temp in case of error */
113 sensor->last_val = temp;
115 if (sensor->last_val > sensor->sensor->max_temp) {
116 sensor->critical_count++;
117 printf("WARNING: Current temperature (%s: %d.%d C) "
118 "exceeds critical temperature (%d.%d C); "
120 sensor->sensor->name,
121 (sensor->last_val - ZERO_C_TO_K) / 10,
122 (sensor->last_val - ZERO_C_TO_K) % 10,
123 (sensor->sensor->max_temp - ZERO_C_TO_K) / 10,
124 (sensor->sensor->max_temp - ZERO_C_TO_K) % 10,
125 sensor->critical_count);
126 if (sensor->critical_count >= MAX_CRITICAL_COUNT) {
127 printf("WARNING: %s temperature exceeded "
128 "critical temperature %d times in a row; "
130 sensor->sensor->name,
131 sensor->critical_count);
132 shutdown_nice(RB_POWEROFF);
135 if (sensor->critical_count > 0)
136 sensor->critical_count--;
140 /* Set all the fans */
141 SLIST_FOREACH(fan, &fans, entries) {
142 nsens = nsens_zone = 0;
143 average_excess = max_excess_zone = 0;
144 SLIST_FOREACH(sensor, &sensors, entries) {
145 temp = imin(sensor->last_val,
146 sensor->sensor->max_temp);
147 frac_excess = (temp -
148 sensor->sensor->target_temp)*100 /
149 (sensor->sensor->max_temp - temp + 1);
152 if (sensor->sensor->zone == fan->fan->zone) {
153 max_excess_zone = imax(max_excess_zone,
157 average_excess += frac_excess;
160 average_excess /= nsens;
162 /* If there are no sensors in this zone, use the average */
164 max_excess_zone = average_excess;
165 /* No sensors at all? Use default */
167 fan->fan->set(fan->fan, fan->fan->default_rpm);
172 * Scale the fan linearly in the max temperature in its
175 max_excess_zone = imin(max_excess_zone, 100);
176 fan_speed = max_excess_zone *
177 (fan->fan->max_rpm - fan->fan->min_rpm)/100 +
179 if (fan_speed >= fan->last_val) {
180 fan->timer = FAN_HYSTERESIS_TIMER;
181 fan->last_val = fan_speed;
184 if (fan->timer == 0) {
185 fan->last_val = fan_speed;
186 fan->timer = FAN_HYSTERESIS_TIMER;
189 fan->fan->set(fan->fan, fan->last_val);
194 pmac_thermal_fan_register(struct pmac_fan *fan)
196 struct pmac_fan_le *list_entry;
198 list_entry = malloc(sizeof(struct pmac_fan_le), M_PMACTHERM,
200 list_entry->fan = fan;
202 SLIST_INSERT_HEAD(&fans, list_entry, entries);
206 pmac_thermal_sensor_register(struct pmac_therm *sensor)
208 struct pmac_sens_le *list_entry;
210 list_entry = malloc(sizeof(struct pmac_sens_le), M_PMACTHERM,
212 list_entry->sensor = sensor;
213 list_entry->last_val = 0;
214 list_entry->critical_count = 0;
216 SLIST_INSERT_HEAD(&sensors, list_entry, entries);