xref: /linux/drivers/thermal/thermal_trip.c (revision 3fd6c59042dbba50391e30862beac979491145fe)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *  Copyright (C) 2008 Intel Corp
4  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
5  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
6  *  Copyright 2022 Linaro Limited
7  *
8  * Thermal trips handling
9  */
10 #include "thermal_core.h"
11 
12 static const char *trip_type_names[] = {
13 	[THERMAL_TRIP_ACTIVE] = "active",
14 	[THERMAL_TRIP_PASSIVE] = "passive",
15 	[THERMAL_TRIP_HOT] = "hot",
16 	[THERMAL_TRIP_CRITICAL] = "critical",
17 };
18 
thermal_trip_type_name(enum thermal_trip_type trip_type)19 const char *thermal_trip_type_name(enum thermal_trip_type trip_type)
20 {
21 	if (trip_type < THERMAL_TRIP_ACTIVE || trip_type > THERMAL_TRIP_CRITICAL)
22 		return "unknown";
23 
24 	return trip_type_names[trip_type];
25 }
26 
for_each_thermal_trip(struct thermal_zone_device * tz,int (* cb)(struct thermal_trip *,void *),void * data)27 int for_each_thermal_trip(struct thermal_zone_device *tz,
28 			  int (*cb)(struct thermal_trip *, void *),
29 			  void *data)
30 {
31 	struct thermal_trip_desc *td;
32 	int ret;
33 
34 	for_each_trip_desc(tz, td) {
35 		ret = cb(&td->trip, data);
36 		if (ret)
37 			return ret;
38 	}
39 
40 	return 0;
41 }
42 EXPORT_SYMBOL_GPL(for_each_thermal_trip);
43 
thermal_zone_for_each_trip(struct thermal_zone_device * tz,int (* cb)(struct thermal_trip *,void *),void * data)44 int thermal_zone_for_each_trip(struct thermal_zone_device *tz,
45 			       int (*cb)(struct thermal_trip *, void *),
46 			       void *data)
47 {
48 	guard(thermal_zone)(tz);
49 
50 	return for_each_thermal_trip(tz, cb, data);
51 }
52 EXPORT_SYMBOL_GPL(thermal_zone_for_each_trip);
53 
thermal_zone_set_trips(struct thermal_zone_device * tz,int low,int high)54 void thermal_zone_set_trips(struct thermal_zone_device *tz, int low, int high)
55 {
56 	int ret;
57 
58 	lockdep_assert_held(&tz->lock);
59 
60 	if (!tz->ops.set_trips)
61 		return;
62 
63 	/* No need to change trip points */
64 	if (tz->prev_low_trip == low && tz->prev_high_trip == high)
65 		return;
66 
67 	tz->prev_low_trip = low;
68 	tz->prev_high_trip = high;
69 
70 	dev_dbg(&tz->device,
71 		"new temperature boundaries: %d < x < %d\n", low, high);
72 
73 	/*
74 	 * Set a temperature window. When this window is left the driver
75 	 * must inform the thermal core via thermal_zone_device_update.
76 	 */
77 	ret = tz->ops.set_trips(tz, low, high);
78 	if (ret)
79 		dev_err(&tz->device, "Failed to set trips: %d\n", ret);
80 }
81 
thermal_zone_trip_id(const struct thermal_zone_device * tz,const struct thermal_trip * trip)82 int thermal_zone_trip_id(const struct thermal_zone_device *tz,
83 			 const struct thermal_trip *trip)
84 {
85 	/*
86 	 * Assume the trip to be located within the bounds of the thermal
87 	 * zone's trips[] table.
88 	 */
89 	return trip_to_trip_desc(trip) - tz->trips;
90 }
91