LXR linux/drivers/thermal/user

   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 */
  36static 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
  54static struct thermal_governor thermal_gov_user_space = {
  55        .name           = "user_space",
  56        .throttle       = notify_user_space,
  57};
  58
  59int thermal_gov_user_space_register(void)
  60{
  61        return thermal_register_governor(&thermal_gov_user_space);
  62}
  63
  64void thermal_gov_user_space_unregister(void)
  65{
  66        thermal_unregister_governor(&thermal_gov_user_space);
  67}
  68
  69