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 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 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 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 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 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