/*
   *  user_space.c - A simple user space Thermal events notifier
   *
   *  Copyright (C) 2012 Intel Corp
   *  Copyright (C) 2012 Durgadoss R <durgadoss.r@intel.com>
   *
   *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; version 2 of the License.
   *
   *  This program is distributed in the hope that it will be useful, but
   *  WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   *  General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License along
   *  with this program; if not, write to the Free Software Foundation, Inc.,
   *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
   *
   * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   */
  
  #include <linux/thermal.h>
  #include <linux/slab.h>
  
  #include "thermal_core.h"
  
  /**
   * notify_user_space - Notifies user space about thermal events
   * @tz - thermal_zone_device
   * @trip - trip point index
   *
   * This function notifies the user space through UEvents.
   */
  static int notify_user_space(struct thermal_zone_device *tz, int trip)
  {
  	char *thermal_prop[5];
  	int i;
  
  	mutex_lock(&tz->lock);
  	thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s", tz->type);
  	thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d", tz->temperature);
  	thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=%d", trip);
  	thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d", tz->notify_event);
  	thermal_prop[4] = NULL;
  	kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE, thermal_prop);
  	for (i = 0; i < 4; ++i)
  		kfree(thermal_prop[i]);
  	mutex_unlock(&tz->lock);
  	return 0;
  }
  
  static struct thermal_governor thermal_gov_user_space = {
  	.name		= "user_space",
  	.throttle	= notify_user_space,
  };
  
  int thermal_gov_user_space_register(void)
  {
  	return thermal_register_governor(&thermal_gov_user_space);
  }
  
  void thermal_gov_user_space_unregister(void)
  {
  	thermal_unregister_governor(&thermal_gov_user_space);
  }