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
user_space_bind(struct thermal_zone_device * tz)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 */
notify_user_space(struct thermal_zone_device * tz,int trip)32 static 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
51 static struct thermal_governor thermal_gov_user_space = {
52 .name = "user_space",
53 .throttle = notify_user_space,
54 .bind_to_tz = user_space_bind,
55 };
56 THERMAL_GOVERNOR_DECLARE(thermal_gov_user_space);
57
