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 |
29 | * |
30 | * This function notifies the user space through UEvents. |
31 | */ |
32 | static int notify_user_space(struct thermal_zone_device *tz, |
33 | const struct thermal_trip *trip) |
34 | { |
35 | char *thermal_prop[5]; |
36 | int i; |
37 | |
38 | lockdep_assert_held(&tz->lock); |
39 | |
40 | thermal_prop[0] = kasprintf(GFP_KERNEL, fmt: "NAME=%s" , tz->type); |
41 | thermal_prop[1] = kasprintf(GFP_KERNEL, fmt: "TEMP=%d" , tz->temperature); |
42 | thermal_prop[2] = kasprintf(GFP_KERNEL, fmt: "TRIP=%d" , |
43 | thermal_zone_trip_id(tz, trip)); |
44 | thermal_prop[3] = kasprintf(GFP_KERNEL, fmt: "EVENT=%d" , tz->notify_event); |
45 | thermal_prop[4] = NULL; |
46 | kobject_uevent_env(kobj: &tz->device.kobj, action: KOBJ_CHANGE, envp: thermal_prop); |
47 | for (i = 0; i < 4; ++i) |
48 | kfree(objp: thermal_prop[i]); |
49 | |
50 | return 0; |
51 | } |
52 | |
53 | static struct thermal_governor thermal_gov_user_space = { |
54 | .name = "user_space" , |
55 | .throttle = notify_user_space, |
56 | .bind_to_tz = user_space_bind, |
57 | }; |
58 | THERMAL_GOVERNOR_DECLARE(thermal_gov_user_space); |
59 | |