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| 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 | +int __for_each_thermal_trip(struct thermal_zone_device *tz, |
| 13 | + int (*cb)(struct thermal_trip *, void *), |
| 14 | + void *data) |
| 15 | +{ |
| 16 | + int i, ret; |
| 17 | + struct thermal_trip trip; |
| 18 | + |
| 19 | + lockdep_assert_held(&tz->lock); |
| 20 | + |
| 21 | + for (i = 0; i < tz->num_trips; i++) { |
| 22 | + |
| 23 | + ret = __thermal_zone_get_trip(tz, i, &trip); |
| 24 | + if (ret) |
| 25 | + return ret; |
| 26 | + |
| 27 | + ret = cb(&trip, data); |
| 28 | + if (ret) |
| 29 | + return ret; |
| 30 | + } |
| 31 | + |
| 32 | + return 0; |
| 33 | +} |
| 34 | + |
| 35 | +int thermal_zone_get_num_trips(struct thermal_zone_device *tz) |
| 36 | +{ |
| 37 | + return tz->num_trips; |
| 38 | +} |
| 39 | +EXPORT_SYMBOL_GPL(thermal_zone_get_num_trips); |
| 40 | + |
| 41 | +/** |
| 42 | + * __thermal_zone_set_trips - Computes the next trip points for the driver |
| 43 | + * @tz: a pointer to a thermal zone device structure |
| 44 | + * |
| 45 | + * The function computes the next temperature boundaries by browsing |
| 46 | + * the trip points. The result is the closer low and high trip points |
| 47 | + * to the current temperature. These values are passed to the backend |
| 48 | + * driver to let it set its own notification mechanism (usually an |
| 49 | + * interrupt). |
| 50 | + * |
| 51 | + * This function must be called with tz->lock held. Both tz and tz->ops |
| 52 | + * must be valid pointers. |
| 53 | + * |
| 54 | + * It does not return a value |
| 55 | + */ |
| 56 | +void __thermal_zone_set_trips(struct thermal_zone_device *tz) |
| 57 | +{ |
| 58 | + struct thermal_trip trip; |
| 59 | + int low = -INT_MAX, high = INT_MAX; |
| 60 | + int i, ret; |
| 61 | + |
| 62 | + lockdep_assert_held(&tz->lock); |
| 63 | + |
| 64 | + if (!tz->ops->set_trips) |
| 65 | + return; |
| 66 | + |
| 67 | + for (i = 0; i < tz->num_trips; i++) { |
| 68 | + int trip_low; |
| 69 | + |
| 70 | + ret = __thermal_zone_get_trip(tz, i , &trip); |
| 71 | + if (ret) |
| 72 | + return; |
| 73 | + |
| 74 | + trip_low = trip.temperature - trip.hysteresis; |
| 75 | + |
| 76 | + if (trip_low < tz->temperature && trip_low > low) |
| 77 | + low = trip_low; |
| 78 | + |
| 79 | + if (trip.temperature > tz->temperature && |
| 80 | + trip.temperature < high) |
| 81 | + high = trip.temperature; |
| 82 | + } |
| 83 | + |
| 84 | + /* No need to change trip points */ |
| 85 | + if (tz->prev_low_trip == low && tz->prev_high_trip == high) |
| 86 | + return; |
| 87 | + |
| 88 | + tz->prev_low_trip = low; |
| 89 | + tz->prev_high_trip = high; |
| 90 | + |
| 91 | + dev_dbg(&tz->device, |
| 92 | + "new temperature boundaries: %d < x < %d\n", low, high); |
| 93 | + |
| 94 | + /* |
| 95 | + * Set a temperature window. When this window is left the driver |
| 96 | + * must inform the thermal core via thermal_zone_device_update. |
| 97 | + */ |
| 98 | + ret = tz->ops->set_trips(tz, low, high); |
| 99 | + if (ret) |
| 100 | + dev_err(&tz->device, "Failed to set trips: %d\n", ret); |
| 101 | +} |
| 102 | + |
| 103 | +int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id, |
| 104 | + struct thermal_trip *trip) |
| 105 | +{ |
| 106 | + int ret; |
| 107 | + |
| 108 | + if (!tz || trip_id < 0 || trip_id >= tz->num_trips || !trip) |
| 109 | + return -EINVAL; |
| 110 | + |
| 111 | + if (tz->trips) { |
| 112 | + *trip = tz->trips[trip_id]; |
| 113 | + return 0; |
| 114 | + } |
| 115 | + |
| 116 | + if (tz->ops->get_trip_hyst) { |
| 117 | + ret = tz->ops->get_trip_hyst(tz, trip_id, &trip->hysteresis); |
| 118 | + if (ret) |
| 119 | + return ret; |
| 120 | + } else { |
| 121 | + trip->hysteresis = 0; |
| 122 | + } |
| 123 | + |
| 124 | + ret = tz->ops->get_trip_temp(tz, trip_id, &trip->temperature); |
| 125 | + if (ret) |
| 126 | + return ret; |
| 127 | + |
| 128 | + return tz->ops->get_trip_type(tz, trip_id, &trip->type); |
| 129 | +} |
| 130 | +EXPORT_SYMBOL_GPL(__thermal_zone_get_trip); |
| 131 | + |
| 132 | +int thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id, |
| 133 | + struct thermal_trip *trip) |
| 134 | +{ |
| 135 | + int ret; |
| 136 | + |
| 137 | + mutex_lock(&tz->lock); |
| 138 | + ret = __thermal_zone_get_trip(tz, trip_id, trip); |
| 139 | + mutex_unlock(&tz->lock); |
| 140 | + |
| 141 | + return ret; |
| 142 | +} |
| 143 | +EXPORT_SYMBOL_GPL(thermal_zone_get_trip); |
| 144 | + |
| 145 | +int thermal_zone_set_trip(struct thermal_zone_device *tz, int trip_id, |
| 146 | + const struct thermal_trip *trip) |
| 147 | +{ |
| 148 | + struct thermal_trip t; |
| 149 | + int ret; |
| 150 | + |
| 151 | + if (!tz->ops->set_trip_temp && !tz->ops->set_trip_hyst && !tz->trips) |
| 152 | + return -EINVAL; |
| 153 | + |
| 154 | + ret = __thermal_zone_get_trip(tz, trip_id, &t); |
| 155 | + if (ret) |
| 156 | + return ret; |
| 157 | + |
| 158 | + if (t.type != trip->type) |
| 159 | + return -EINVAL; |
| 160 | + |
| 161 | + if (t.temperature != trip->temperature && tz->ops->set_trip_temp) { |
| 162 | + ret = tz->ops->set_trip_temp(tz, trip_id, trip->temperature); |
| 163 | + if (ret) |
| 164 | + return ret; |
| 165 | + } |
| 166 | + |
| 167 | + if (t.hysteresis != trip->hysteresis && tz->ops->set_trip_hyst) { |
| 168 | + ret = tz->ops->set_trip_hyst(tz, trip_id, trip->hysteresis); |
| 169 | + if (ret) |
| 170 | + return ret; |
| 171 | + } |
| 172 | + |
| 173 | + if (tz->trips && (t.temperature != trip->temperature || t.hysteresis != trip->hysteresis)) |
| 174 | + tz->trips[trip_id] = *trip; |
| 175 | + |
| 176 | + thermal_notify_tz_trip_change(tz->id, trip_id, trip->type, |
| 177 | + trip->temperature, trip->hysteresis); |
| 178 | + |
| 179 | + __thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED); |
| 180 | + |
| 181 | + return 0; |
| 182 | +} |
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