GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / thermal / gov_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 <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 static 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  */
32 static int notify_user_space(struct thermal_zone_device *tz, int trip)
33 {
34         char *thermal_prop[5];
35         int i;
36
37         mutex_lock(&tz->lock);
38         thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s", tz->type);
39         thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d", tz->temperature);
40         thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=%d", trip);
41         thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d", tz->notify_event);
42         thermal_prop[4] = NULL;
43         kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE, thermal_prop);
44         for (i = 0; i < 4; ++i)
45                 kfree(thermal_prop[i]);
46         mutex_unlock(&tz->lock);
47         return 0;
48 }
49
50 static struct thermal_governor thermal_gov_user_space = {
51         .name           = "user_space",
52         .throttle       = notify_user_space,
53         .bind_to_tz     = user_space_bind,
54 };
55 THERMAL_GOVERNOR_DECLARE(thermal_gov_user_space);