FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_power.c
1 /*-
2 * Copyright (c) 2001 Mitsuru IWASAKI
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/5.3/sys/kern/subr_power.c 136588 2004-10-16 08:43:07Z cvs2svn $");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/proc.h>
33
34 #include <sys/power.h>
35
36 static u_int power_pm_type = POWER_PM_TYPE_NONE;
37 static power_pm_fn_t power_pm_fn = NULL;
38 static void *power_pm_arg = NULL;
39
40 int
41 power_pm_register(u_int pm_type, power_pm_fn_t pm_fn, void *pm_arg)
42 {
43 int error;
44
45 if (power_pm_type == POWER_PM_TYPE_NONE ||
46 power_pm_type == pm_type) {
47 power_pm_type = pm_type;
48 power_pm_fn = pm_fn;
49 power_pm_arg = pm_arg;
50 error = 0;
51 } else {
52 error = ENXIO;
53 }
54
55 return (error);
56 }
57
58 u_int
59 power_pm_get_type(void)
60 {
61
62 return (power_pm_type);
63 }
64
65 void
66 power_pm_suspend(int state)
67 {
68 if (power_pm_fn == NULL)
69 return;
70
71 if (state != POWER_SLEEP_STATE_STANDBY &&
72 state != POWER_SLEEP_STATE_SUSPEND &&
73 state != POWER_SLEEP_STATE_HIBERNATE)
74 return;
75
76 power_pm_fn(POWER_CMD_SUSPEND, power_pm_arg, state);
77 }
78
79 /*
80 * Power profile.
81 */
82
83 static int power_profile_state = POWER_PROFILE_PERFORMANCE;
84
85 int
86 power_profile_get_state(void)
87 {
88 return (power_profile_state);
89 }
90
91 void
92 power_profile_set_state(int state)
93 {
94 int changed;
95
96 if (state != power_profile_state) {
97 power_profile_state = state;
98 changed = 1;
99 if (bootverbose) {
100 printf("system power profile changed to '%s'\n",
101 (state == POWER_PROFILE_PERFORMANCE) ?
102 "performance" : "economy");
103 }
104 } else {
105 changed = 0;
106 }
107
108 if (changed)
109 EVENTHANDLER_INVOKE(power_profile_change, 0);
110 }
111
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