xref: /freebsd/sys/kern/subr_power.c (revision aa0a1e58)
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("$FreeBSD$");
29 
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/proc.h>
33 
34 #include <sys/power.h>
35 #include <sys/taskqueue.h>
36 
37 static u_int		 power_pm_type	= POWER_PM_TYPE_NONE;
38 static power_pm_fn_t	 power_pm_fn	= NULL;
39 static void		*power_pm_arg	= NULL;
40 static struct task	 power_pm_task;
41 
42 static void
43 power_pm_deferred_fn(void *arg, int pending)
44 {
45 	int state = (intptr_t)arg;
46 
47 	power_pm_fn(POWER_CMD_SUSPEND, power_pm_arg, state);
48 }
49 
50 int
51 power_pm_register(u_int pm_type, power_pm_fn_t pm_fn, void *pm_arg)
52 {
53 	int	error;
54 
55 	if (power_pm_type == POWER_PM_TYPE_NONE ||
56 	    power_pm_type == pm_type) {
57 		power_pm_type	= pm_type;
58 		power_pm_fn	= pm_fn;
59 		power_pm_arg	= pm_arg;
60 		error = 0;
61 		TASK_INIT(&power_pm_task, 0, power_pm_deferred_fn, NULL);
62 	} else {
63 		error = ENXIO;
64 	}
65 
66 	return (error);
67 }
68 
69 u_int
70 power_pm_get_type(void)
71 {
72 
73 	return (power_pm_type);
74 }
75 
76 void
77 power_pm_suspend(int state)
78 {
79 	if (power_pm_fn == NULL)
80 		return;
81 
82 	if (state != POWER_SLEEP_STATE_STANDBY &&
83 	    state != POWER_SLEEP_STATE_SUSPEND &&
84 	    state != POWER_SLEEP_STATE_HIBERNATE)
85 		return;
86 	power_pm_task.ta_context = (void *)(intptr_t)state;
87 	taskqueue_enqueue(taskqueue_thread, &power_pm_task);
88 }
89 
90 /*
91  * Power profile.
92  */
93 
94 static int	power_profile_state = POWER_PROFILE_PERFORMANCE;
95 
96 int
97 power_profile_get_state(void)
98 {
99 	return (power_profile_state);
100 }
101 
102 void
103 power_profile_set_state(int state)
104 {
105 	int		changed;
106 
107 	if (state != power_profile_state) {
108 		power_profile_state = state;
109 		changed = 1;
110 		if (bootverbose) {
111 			printf("system power profile changed to '%s'\n",
112 				(state == POWER_PROFILE_PERFORMANCE) ?
113 				"performance" : "economy");
114 		}
115 	} else {
116 		changed = 0;
117 	}
118 
119 	if (changed)
120 		EVENTHANDLER_INVOKE(power_profile_change, 0);
121 }
122 
123