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/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 */
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);