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("$FreeBSD$");
  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