linux/drivers/thermal/user_space.c
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   1/*
   2 *  user_space.c - A simple user space Thermal events notifier
   3 *
   4 *  Copyright (C) 2012 Intel Corp
   5 *  Copyright (C) 2012 Durgadoss R <durgadoss.r@intel.com>
   6 *
   7 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8 *
   9 *  This program is free software; you can redistribute it and/or modify
  10 *  it under the terms of the GNU General Public License as published by
  11 *  the Free Software Foundation; version 2 of the License.
  12 *
  13 *  This program is distributed in the hope that it will be useful, but
  14 *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 *  General Public License for more details.
  17 *
  18 *  You should have received a copy of the GNU General Public License along
  19 *  with this program; if not, write to the Free Software Foundation, Inc.,
  20 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21 *
  22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23 */
  24
  25#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  26
  27#include <linux/module.h>
  28#include <linux/thermal.h>
  29
  30#include "thermal_core.h"
  31
  32/**
  33 * notify_user_space - Notifies user space about thermal events
  34 * @tz - thermal_zone_device
  35 *
  36 * This function notifies the user space through UEvents.
  37 */
  38static int notify_user_space(struct thermal_zone_device *tz, int trip)
  39{
  40        mutex_lock(&tz->lock);
  41        kobject_uevent(&tz->device.kobj, KOBJ_CHANGE);
  42        mutex_unlock(&tz->lock);
  43        return 0;
  44}
  45
  46static struct thermal_governor thermal_gov_user_space = {
  47        .name           = "user_space",
  48        .throttle       = notify_user_space,
  49        .owner          = THIS_MODULE,
  50};
  51
  52static int __init thermal_gov_user_space_init(void)
  53{
  54        return thermal_register_governor(&thermal_gov_user_space);
  55}
  56
  57static void __exit thermal_gov_user_space_exit(void)
  58{
  59        thermal_unregister_governor(&thermal_gov_user_space);
  60}
  61
  62/* This should load after thermal framework */
  63fs_initcall(thermal_gov_user_space_init);
  64module_exit(thermal_gov_user_space_exit);
  65
  66MODULE_AUTHOR("Durgadoss R");
  67MODULE_DESCRIPTION("A user space Thermal notifier");
  68MODULE_LICENSE("GPL");
  69
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