text: /*-
   * Copyright (c) 2001 Mitsuru IWASAKI
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD: src/sys/kern/subr_power.c,v 1.8 2005/11/09 16:22:56 imp Exp $");
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/proc.h>
  
  #include <sys/power.h>
  #include <sys/taskqueue.h>
  
  static u_int		 power_pm_type	= POWER_PM_TYPE_NONE;
  static power_pm_fn_t	 power_pm_fn	= NULL;
  static void		*power_pm_arg	= NULL;
  static struct task	 power_pm_task;
  
  static void
  power_pm_deferred_fn(void *arg, int pending)
  {
  	int state = (intptr_t)arg;
  
  	power_pm_fn(POWER_CMD_SUSPEND, power_pm_arg, state);
  }
  
  int
  power_pm_register(u_int pm_type, power_pm_fn_t pm_fn, void *pm_arg)
  {
  	int	error;
  
  	if (power_pm_type == POWER_PM_TYPE_NONE ||
  	    power_pm_type == pm_type) {
  		power_pm_type	= pm_type;
  		power_pm_fn	= pm_fn;
  		power_pm_arg	= pm_arg;
  		error = 0;
  		TASK_INIT(&power_pm_task, 0, power_pm_deferred_fn, NULL);
  	} else {
  		error = ENXIO;
  	}
  
  	return (error);
  }
  
  u_int
  power_pm_get_type(void)
  {
  
  	return (power_pm_type);
  }
  
  void
  power_pm_suspend(int state)
  {
  	if (power_pm_fn == NULL)
  		return;
  
  	if (state != POWER_SLEEP_STATE_STANDBY &&
  	    state != POWER_SLEEP_STATE_SUSPEND &&
  	    state != POWER_SLEEP_STATE_HIBERNATE)
  		return;
  	power_pm_task.ta_context = (void *)(intptr_t)state;
  	taskqueue_enqueue(taskqueue_thread, &power_pm_task);
  }
  
  /*
   * Power profile.
   */
  
  static int	power_profile_state = POWER_PROFILE_PERFORMANCE;
  
  int
  power_profile_get_state(void)
  {
  	return (power_profile_state);
  }
  
  void
  power_profile_set_state(int state) 
  {
  	int		changed;
      
  	if (state != power_profile_state) {
  		power_profile_state = state;
  		changed = 1;
  		if (bootverbose) {
  			printf("system power profile changed to '%s'\n",
  				(state == POWER_PROFILE_PERFORMANCE) ?
  				"performance" : "economy");
  		}
  	} else {
  		changed = 0;
  	}
  
  	if (changed)
  		EVENTHANDLER_INVOKE(power_profile_change, 0);
  }
  
  