drivers/thermal/user_space.c

   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 <[email protected]>
   7  *
   8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  */
  12
  13 #include <linux/thermal.h>
  14 #include <linux/slab.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  */
  25 static 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
  43 static struct thermal_governor thermal_gov_user_space = {
  44         .name           = "user_space",
  45         .throttle       = notify_user_space,
  46 };
  47 THERMAL_GOVERNOR_DECLARE(thermal_gov_user_space);