drivers/thermal/user_space.c

   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  */
  38 static 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
  46 static struct thermal_governor thermal_gov_user_space = {
  47         .name           = "user_space",
  48         .throttle       = notify_user_space,
  49         .owner          = THIS_MODULE,
  50 };
  51
  52 static int __init thermal_gov_user_space_init(void)
  53 {
  54         return thermal_register_governor(&thermal_gov_user_space);
  55 }
  56
  57 static 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 */
  63 fs_initcall(thermal_gov_user_space_init);
  64 module_exit(thermal_gov_user_space_exit);
  65
  66 MODULE_AUTHOR("Durgadoss R");
  67 MODULE_DESCRIPTION("A user space Thermal notifier");
  68 MODULE_LICENSE("GPL");