subr_power.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2001 Mitsuru IWASAKI
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/proc.h>
   35 
   36 #include <sys/power.h>
   37 #include <sys/taskqueue.h>
   38 
   39 static u_int             power_pm_type  = POWER_PM_TYPE_NONE;
   40 static power_pm_fn_t     power_pm_fn    = NULL;
   41 static void             *power_pm_arg   = NULL;
   42 static struct task       power_pm_task;
   43 
   44 static void
   45 power_pm_deferred_fn(void *arg, int pending)
   46 {
   47         int state = (intptr_t)arg;
   48 
   49         power_pm_fn(POWER_CMD_SUSPEND, power_pm_arg, state);
   50 }
   51 
   52 int
   53 power_pm_register(u_int pm_type, power_pm_fn_t pm_fn, void *pm_arg)
   54 {
   55         int     error;
   56 
   57         if (power_pm_type == POWER_PM_TYPE_NONE ||
   58             power_pm_type == pm_type) {
   59                 power_pm_type   = pm_type;
   60                 power_pm_fn     = pm_fn;
   61                 power_pm_arg    = pm_arg;
   62                 error = 0;
   63                 TASK_INIT(&power_pm_task, 0, power_pm_deferred_fn, NULL);
   64         } else {
   65                 error = ENXIO;
   66         }
   67 
   68         return (error);
   69 }
   70 
   71 u_int
   72 power_pm_get_type(void)
   73 {
   74 
   75         return (power_pm_type);
   76 }
   77 
   78 void
   79 power_pm_suspend(int state)
   80 {
   81         if (power_pm_fn == NULL)
   82                 return;
   83 
   84         if (state != POWER_SLEEP_STATE_STANDBY &&
   85             state != POWER_SLEEP_STATE_SUSPEND &&
   86             state != POWER_SLEEP_STATE_HIBERNATE)
   87                 return;
   88         power_pm_task.ta_context = (void *)(intptr_t)state;
   89         taskqueue_enqueue(taskqueue_thread, &power_pm_task);
   90 }
   91 
   92 /*
   93  * Power profile.
   94  */
   95 
   96 static int      power_profile_state = POWER_PROFILE_PERFORMANCE;
   97 
   98 int
   99 power_profile_get_state(void)
  100 {
  101         return (power_profile_state);
  102 }
  103 
  104 void
  105 power_profile_set_state(int state) 
  106 {
  107         int             changed;
  108     
  109         if (state != power_profile_state) {
  110                 power_profile_state = state;
  111                 changed = 1;
  112                 if (bootverbose) {
  113                         printf("system power profile changed to '%s'\n",
  114                                 (state == POWER_PROFILE_PERFORMANCE) ?
  115                                 "performance" : "economy");
  116                 }
  117         } else {
  118                 changed = 0;
  119         }
  120 
  121         if (changed)
  122                 EVENTHANDLER_INVOKE(power_profile_change, 0);
  123 }
  124

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

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