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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_power.c

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    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: src/sys/kern/subr_power.c,v 1.5 2004/01/02 18:24:13 njl Exp $");
   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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