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  * $DragonFly: src/sys/kern/subr_power.c,v 1.2 2006/12/23 00:35:04 swildner Exp $
  26  */
  27
  28 #include <sys/cdefs.h>
  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                 kprintf("system power profile changed to '%s'\n",
 100                        (state == POWER_PROFILE_PERFORMANCE) ? "performance" : "economy");
 101         } else {
 102                 changed = 0;
 103         }
 104
 105         if (changed)
 106                 EVENTHANDLER_INVOKE(power_profile_change, 0);
 107 }
 108