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 #include <linux/thermal.h>
  26 #include <linux/slab.h>
  27 #include "thermal_core.h"
  28
  29 /**
  30  * notify_user_space - Notifies user space about thermal events
  31  * @tz - thermal_zone_device
  32  * @trip - Trip point index
  33  *
  34  * This function notifies the user space through UEvents.
  35  */
  36 static int notify_user_space(struct thermal_zone_device *tz, int trip)
  37 {
  38         char *thermal_prop[5];
  39         int i;
  40
  41         mutex_lock(&tz->lock);
  42         thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s", tz->type);
  43         thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d", tz->temperature);
  44         thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=%d", trip);
  45         thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d", tz->notify_event);
  46         thermal_prop[4] = NULL;
  47         kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE, thermal_prop);
  48         for (i = 0; i < 4; ++i)
  49                 kfree(thermal_prop[i]);
  50         mutex_unlock(&tz->lock);
  51         return 0;
  52 }
  53
  54 static struct thermal_governor thermal_gov_user_space = {
  55         .name           = "user_space",
  56         .throttle       = notify_user_space,
  57 };
  58
  59 int thermal_gov_user_space_register(void)
  60 {
  61         return thermal_register_governor(&thermal_gov_user_space);
  62 }
  63
  64 void thermal_gov_user_space_unregister(void)
  65 {
  66         thermal_unregister_governor(&thermal_gov_user_space);
  67 }
  68