1 // SPDX-License-Identifier: GPL-2.0
3  *  thermal_helpers.c - helper functions to handle thermal devices
27 	struct thermal_trip *trip = tz->trips ? &tz->trips[trip_index] : NULL;  in get_tz_trend()
30 	if (tz->emul_temperature || !tz->ops->get_trend ||  in get_tz_trend()
31 	    tz->ops->get_trend(tz, trip, &trend)) {  in get_tz_trend()
32 		if (tz->temperature > tz->last_temperature)  in get_tz_trend()
34 		else if (tz->temperature < tz->last_temperature)  in get_tz_trend()
51 	mutex_lock(&tz->lock);  in get_thermal_instance()
52 	mutex_lock(&cdev->lock);  in get_thermal_instance()
54 	trip = &tz->trips[trip_index];  in get_thermal_instance()
56 	list_for_each_entry(pos, &tz->thermal_instances, tz_node) {  in get_thermal_instance()
57 		if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {  in get_thermal_instance()
63 	mutex_unlock(&cdev->lock);  in get_thermal_instance()
64 	mutex_unlock(&tz->lock);  in get_thermal_instance()
71  * __thermal_zone_get_temp() - returns the temperature of a thermal zone
75  * When a valid thermal zone reference is passed, it will fetch its
78  * Both tz and tz->ops must be valid pointers when calling this function,
79  * and the tz->ops->get_temp callback must be provided.
80  * The function must be called under tz->lock.
86 	int ret = -EINVAL;  in __thermal_zone_get_temp()
91 	lockdep_assert_held(&tz->lock);  in __thermal_zone_get_temp()
93 	ret = tz->ops->get_temp(tz, temp);  in __thermal_zone_get_temp()
95 	if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {  in __thermal_zone_get_temp()
96 		for (count = 0; count < tz->num_trips; count++) {  in __thermal_zone_get_temp()
110 			*temp = tz->emul_temperature;  in __thermal_zone_get_temp()
114 		dev_dbg(&tz->device, "Failed to get temperature: %d\n", ret);  in __thermal_zone_get_temp()
120  * thermal_zone_get_temp() - returns the temperature of a thermal zone
124  * When a valid thermal zone reference is passed, it will fetch its
134 		return -EINVAL;  in thermal_zone_get_temp()
136 	mutex_lock(&tz->lock);  in thermal_zone_get_temp()
138 	if (!tz->ops->get_temp) {  in thermal_zone_get_temp()
139 		ret = -EINVAL;  in thermal_zone_get_temp()
143 	if (device_is_registered(&tz->device))  in thermal_zone_get_temp()
146 		ret = -ENODEV;  in thermal_zone_get_temp()
149 	mutex_unlock(&tz->lock);  in thermal_zone_get_temp()
158 	if (cdev->ops->set_cur_state(cdev, target))  in thermal_cdev_set_cur_state()
161 	thermal_notify_cdev_state_update(cdev->id, target);  in thermal_cdev_set_cur_state()
171 	list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {  in __thermal_cdev_update()
172 		dev_dbg(&cdev->device, "zone%d->target=%lu\n",  in __thermal_cdev_update()
173 			instance->tz->id, instance->target);  in __thermal_cdev_update()
174 		if (instance->target == THERMAL_NO_TARGET)  in __thermal_cdev_update()
176 		if (instance->target > target)  in __thermal_cdev_update()
177 			target = instance->target;  in __thermal_cdev_update()
183 	dev_dbg(&cdev->device, "set to state %lu\n", target);  in __thermal_cdev_update()
187  * thermal_cdev_update - update cooling device state if needed
194 	mutex_lock(&cdev->lock);  in thermal_cdev_update()
195 	if (!cdev->updated) {  in thermal_cdev_update()
197 		cdev->updated = true;  in thermal_cdev_update()
199 	mutex_unlock(&cdev->lock);  in thermal_cdev_update()
203  * thermal_zone_get_slope - return the slope attribute of the thermal zone
204  * @tz: thermal zone device with the slope attribute
206  * Return: If the thermal zone device has a slope attribute, return it, else
211 	if (tz && tz->tzp)  in thermal_zone_get_slope()
212 		return tz->tzp->slope;  in thermal_zone_get_slope()
218  * thermal_zone_get_offset - return the offset attribute of the thermal zone
219  * @tz: thermal zone device with the offset attribute
221  * Return: If the thermal zone device has a offset attribute, return it, else
226 	if (tz && tz->tzp)  in thermal_zone_get_offset()
227 		return tz->tzp->offset;  in thermal_zone_get_offset()