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
18static int user_space_bind(struct thermal_zone_device *tz)
19{
20	pr_info_once("Consider using thermal netlink events interface\n");
21
22	return 0;
23}
24
25/**
26 * notify_user_space - Notifies user space about thermal events
27 * @tz: thermal_zone_device
28 * @trip: trip point index
29 *
30 * This function notifies the user space through UEvents.
31 */
32static int notify_user_space(struct thermal_zone_device *tz, int trip)
33{
34	char *thermal_prop[5];
35	int i;
36
37	lockdep_assert_held(&tz->lock);
38
39	thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s", tz->type);
40	thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d", tz->temperature);
41	thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=%d", trip);
42	thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d", tz->notify_event);
43	thermal_prop[4] = NULL;
44	kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE, thermal_prop);
45	for (i = 0; i < 4; ++i)
46		kfree(thermal_prop[i]);
47
48	return 0;
49}
50
51static struct thermal_governor thermal_gov_user_space = {
52	.name		= "user_space",
53	.throttle	= notify_user_space,
54	.bind_to_tz	= user_space_bind,
55};
56THERMAL_GOVERNOR_DECLARE(thermal_gov_user_space);