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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2008 Intel Corp4 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>5 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>6 * Copyright 2022 Linaro Limited7 *8 * Thermal trips handling9 */10#include "thermal_core.h"11 12static 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 19const 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 27int 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}42EXPORT_SYMBOL_GPL(for_each_thermal_trip);43 44int thermal_zone_for_each_trip(struct thermal_zone_device *tz,45 int (*cb)(struct thermal_trip *, void *),46 void *data)47{48 int ret;49 50 mutex_lock(&tz->lock);51 ret = for_each_thermal_trip(tz, cb, data);52 mutex_unlock(&tz->lock);53 54 return ret;55}56EXPORT_SYMBOL_GPL(thermal_zone_for_each_trip);57 58void thermal_zone_set_trips(struct thermal_zone_device *tz, int low, int high)59{60 int ret;61 62 lockdep_assert_held(&tz->lock);63 64 if (!tz->ops.set_trips)65 return;66 67 /* No need to change trip points */68 if (tz->prev_low_trip == low && tz->prev_high_trip == high)69 return;70 71 tz->prev_low_trip = low;72 tz->prev_high_trip = high;73 74 dev_dbg(&tz->device,75 "new temperature boundaries: %d < x < %d\n", low, high);76 77 /*78 * Set a temperature window. When this window is left the driver79 * must inform the thermal core via thermal_zone_device_update.80 */81 ret = tz->ops.set_trips(tz, low, high);82 if (ret)83 dev_err(&tz->device, "Failed to set trips: %d\n", ret);84}85 86int thermal_zone_trip_id(const struct thermal_zone_device *tz,87 const struct thermal_trip *trip)88{89 /*90 * Assume the trip to be located within the bounds of the thermal91 * zone's trips[] table.92 */93 return trip_to_trip_desc(trip) - tz->trips;94}95 96void thermal_zone_set_trip_hyst(struct thermal_zone_device *tz,97 struct thermal_trip *trip, int hyst)98{99 WRITE_ONCE(trip->hysteresis, hyst);100 thermal_notify_tz_trip_change(tz, trip);101}102 103void thermal_zone_set_trip_temp(struct thermal_zone_device *tz,104 struct thermal_trip *trip, int temp)105{106 if (trip->temperature == temp)107 return;108 109 WRITE_ONCE(trip->temperature, temp);110 thermal_notify_tz_trip_change(tz, trip);111 112 if (temp == THERMAL_TEMP_INVALID) {113 struct thermal_trip_desc *td = trip_to_trip_desc(trip);114 115 if (tz->temperature >= td->threshold) {116 /*117 * The trip has been crossed on the way up, so some118 * adjustments are needed to compensate for the lack119 * of it going forward.120 */121 if (trip->type == THERMAL_TRIP_PASSIVE) {122 tz->passive--;123 WARN_ON_ONCE(tz->passive < 0);124 }125 thermal_zone_trip_down(tz, trip);126 }127 /*128 * Invalidate the threshold to avoid triggering a spurious129 * trip crossing notification when the trip becomes valid.130 */131 td->threshold = INT_MAX;132 }133}134EXPORT_SYMBOL_GPL(thermal_zone_set_trip_temp);135