1 // SPDX-License-Identifier: GPL-2.0
3  *  thermal_helpers.c - helper functions to handle thermal devices
22 #include <trace/events/thermal.h>
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 	list_for_each_entry(pos, &tz->thermal_instances, tz_node) {  in get_thermal_instance()
55 		if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {  in get_thermal_instance()
61 	mutex_unlock(&cdev->lock);  in get_thermal_instance()
62 	mutex_unlock(&tz->lock);  in get_thermal_instance()
69  * thermal_zone_get_temp() - returns the temperature of a thermal zone
73  * When a valid thermal zone reference is passed, it will fetch its
80 	int ret = -EINVAL;  in thermal_zone_get_temp()
85 	if (!tz || IS_ERR(tz) || !tz->ops->get_temp)  in thermal_zone_get_temp()
88 	mutex_lock(&tz->lock);  in thermal_zone_get_temp()
90 	ret = tz->ops->get_temp(tz, temp);  in thermal_zone_get_temp()
92 	if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {  in thermal_zone_get_temp()
93 		for (count = 0; count < tz->trips; count++) {  in thermal_zone_get_temp()
94 			ret = tz->ops->get_trip_type(tz, count, &type);  in thermal_zone_get_temp()
96 				ret = tz->ops->get_trip_temp(tz, count,  in thermal_zone_get_temp()
108 			*temp = tz->emul_temperature;  in thermal_zone_get_temp()
111 	mutex_unlock(&tz->lock);  in thermal_zone_get_temp()
118  * thermal_zone_set_trips - Computes the next trip points for the driver
119  * @tz: a pointer to a thermal zone device structure
131 	int low = -INT_MAX;  in thermal_zone_set_trips()
136 	mutex_lock(&tz->lock);  in thermal_zone_set_trips()
138 	if (!tz->ops->set_trips || !tz->ops->get_trip_hyst)  in thermal_zone_set_trips()
141 	for (i = 0; i < tz->trips; i++) {  in thermal_zone_set_trips()
144 		tz->ops->get_trip_temp(tz, i, &trip_temp);  in thermal_zone_set_trips()
145 		tz->ops->get_trip_hyst(tz, i, &hysteresis);  in thermal_zone_set_trips()
147 		trip_low = trip_temp - hysteresis;  in thermal_zone_set_trips()
149 		if (trip_low < tz->temperature && trip_low > low)  in thermal_zone_set_trips()
152 		if (trip_temp > tz->temperature && trip_temp < high)  in thermal_zone_set_trips()
157 	if (tz->prev_low_trip == low && tz->prev_high_trip == high)  in thermal_zone_set_trips()
160 	tz->prev_low_trip = low;  in thermal_zone_set_trips()
161 	tz->prev_high_trip = high;  in thermal_zone_set_trips()
163 	dev_dbg(&tz->device,  in thermal_zone_set_trips()
168 	 * must inform the thermal core via thermal_zone_device_update.  in thermal_zone_set_trips()
170 	ret = tz->ops->set_trips(tz, low, high);  in thermal_zone_set_trips()
172 		dev_err(&tz->device, "Failed to set trips: %d\n", ret);  in thermal_zone_set_trips()
175 	mutex_unlock(&tz->lock);  in thermal_zone_set_trips()
181 	if (cdev->ops->set_cur_state(cdev, target))  in thermal_cdev_set_cur_state()
184 	thermal_notify_cdev_state_update(cdev->id, target);  in thermal_cdev_set_cur_state()
193 	mutex_lock(&cdev->lock);  in thermal_cdev_update()
195 	if (cdev->updated) {  in thermal_cdev_update()
196 		mutex_unlock(&cdev->lock);  in thermal_cdev_update()
201 	list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {  in thermal_cdev_update()
202 		dev_dbg(&cdev->device, "zone%d->target=%lu\n",  in thermal_cdev_update()
203 			instance->tz->id, instance->target);  in thermal_cdev_update()
204 		if (instance->target == THERMAL_NO_TARGET)  in thermal_cdev_update()
206 		if (instance->target > target)  in thermal_cdev_update()
207 			target = instance->target;  in thermal_cdev_update()
212 	cdev->updated = true;  in thermal_cdev_update()
213 	mutex_unlock(&cdev->lock);  in thermal_cdev_update()
215 	dev_dbg(&cdev->device, "set to state %lu\n", target);  in thermal_cdev_update()
220  * thermal_zone_get_slope - return the slope attribute of the thermal zone
221  * @tz: thermal zone device with the slope attribute
223  * Return: If the thermal zone device has a slope attribute, return it, else
228 	if (tz && tz->tzp)  in thermal_zone_get_slope()
229 		return tz->tzp->slope;  in thermal_zone_get_slope()
235  * thermal_zone_get_offset - return the offset attribute of the thermal zone
236  * @tz: thermal zone device with the offset attribute
238  * Return: If the thermal zone device has a offset attribute, return it, else
243 	if (tz && tz->tzp)  in thermal_zone_get_offset()
244 		return tz->tzp->offset;  in thermal_zone_get_offset()