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  */
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);
48