The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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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: stable/10/sys/kern/subr_power.c 152248 2005-11-09 16:22:56Z imp $");
   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 

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