linux/drivers/thermal/gov_user_space.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  user_space.c - A simple user space Thermal events notifier
   4 *
   5 *  Copyright (C) 2012 Intel Corp
   6 *  Copyright (C) 2012 Durgadoss R <durgadoss.r@intel.com>
   7 *
   8 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9 *
  10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11 */
  12
  13#include <linux/slab.h>
  14#include <linux/thermal.h>
  15
  16#include "thermal_core.h"
  17
  18/**
  19 * notify_user_space - Notifies user space about thermal events
  20 * @tz: thermal_zone_device
  21 * @trip: trip point index
  22 *
  23 * This function notifies the user space through UEvents.
  24 */
  25static int notify_user_space(struct thermal_zone_device *tz, int trip)
  26{
  27        char *thermal_prop[5];
  28        int i;
  29
  30        mutex_lock(&tz->lock);
  31        thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s", tz->type);
  32        thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d", tz->temperature);
  33        thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=%d", trip);
  34        thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d", tz->notify_event);
  35        thermal_prop[4] = NULL;
  36        kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE, thermal_prop);
  37        for (i = 0; i < 4; ++i)
  38                kfree(thermal_prop[i]);
  39        mutex_unlock(&tz->lock);
  40        return 0;
  41}
  42
  43static struct thermal_governor thermal_gov_user_space = {
  44        .name           = "user_space",
  45        .throttle       = notify_user_space,
  46};
  47THERMAL_GOVERNOR_DECLARE(thermal_gov_user_space);
  48