228 строки
5.8 KiB
C
228 строки
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* thermal_helpers.c - helper functions to handle thermal devices
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*
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* Copyright (C) 2016 Eduardo Valentin <edubezval@gmail.com>
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*
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* Highly based on original thermal_core.c
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* Copyright (C) 2008 Intel Corp
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* Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
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* Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/sysfs.h>
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#include "thermal_core.h"
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#include "thermal_trace.h"
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int get_tz_trend(struct thermal_zone_device *tz, int trip_index)
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{
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struct thermal_trip *trip = tz->trips ? &tz->trips[trip_index] : NULL;
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enum thermal_trend trend;
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if (tz->emul_temperature || !tz->ops->get_trend ||
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tz->ops->get_trend(tz, trip, &trend)) {
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if (tz->temperature > tz->last_temperature)
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trend = THERMAL_TREND_RAISING;
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else if (tz->temperature < tz->last_temperature)
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trend = THERMAL_TREND_DROPPING;
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else
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trend = THERMAL_TREND_STABLE;
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}
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return trend;
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}
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struct thermal_instance *
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get_thermal_instance(struct thermal_zone_device *tz,
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struct thermal_cooling_device *cdev, int trip)
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{
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struct thermal_instance *pos = NULL;
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struct thermal_instance *target_instance = NULL;
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mutex_lock(&tz->lock);
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mutex_lock(&cdev->lock);
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list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
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if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
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target_instance = pos;
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break;
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}
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}
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mutex_unlock(&cdev->lock);
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mutex_unlock(&tz->lock);
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return target_instance;
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}
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EXPORT_SYMBOL(get_thermal_instance);
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/**
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* __thermal_zone_get_temp() - returns the temperature of a thermal zone
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* @tz: a valid pointer to a struct thermal_zone_device
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* @temp: a valid pointer to where to store the resulting temperature.
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*
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* When a valid thermal zone reference is passed, it will fetch its
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* temperature and fill @temp.
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*
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* Both tz and tz->ops must be valid pointers when calling this function,
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* and the tz->ops->get_temp callback must be provided.
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* The function must be called under tz->lock.
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*
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* Return: On success returns 0, an error code otherwise
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*/
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int __thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
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{
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int ret = -EINVAL;
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int count;
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int crit_temp = INT_MAX;
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struct thermal_trip trip;
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lockdep_assert_held(&tz->lock);
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ret = tz->ops->get_temp(tz, temp);
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if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
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for (count = 0; count < tz->num_trips; count++) {
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ret = __thermal_zone_get_trip(tz, count, &trip);
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if (!ret && trip.type == THERMAL_TRIP_CRITICAL) {
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crit_temp = trip.temperature;
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break;
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}
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}
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/*
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* Only allow emulating a temperature when the real temperature
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* is below the critical temperature so that the emulation code
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* cannot hide critical conditions.
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*/
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if (!ret && *temp < crit_temp)
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*temp = tz->emul_temperature;
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}
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if (ret)
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dev_dbg(&tz->device, "Failed to get temperature: %d\n", ret);
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return ret;
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}
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/**
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* thermal_zone_get_temp() - returns the temperature of a thermal zone
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* @tz: a valid pointer to a struct thermal_zone_device
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* @temp: a valid pointer to where to store the resulting temperature.
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*
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* When a valid thermal zone reference is passed, it will fetch its
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* temperature and fill @temp.
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*
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* Return: On success returns 0, an error code otherwise
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*/
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int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
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{
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int ret;
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if (IS_ERR_OR_NULL(tz))
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return -EINVAL;
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mutex_lock(&tz->lock);
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if (!tz->ops->get_temp) {
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ret = -EINVAL;
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goto unlock;
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}
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if (device_is_registered(&tz->device))
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ret = __thermal_zone_get_temp(tz, temp);
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else
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ret = -ENODEV;
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unlock:
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mutex_unlock(&tz->lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
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static void thermal_cdev_set_cur_state(struct thermal_cooling_device *cdev,
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int target)
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{
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if (cdev->ops->set_cur_state(cdev, target))
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return;
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thermal_notify_cdev_state_update(cdev->id, target);
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thermal_cooling_device_stats_update(cdev, target);
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}
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void __thermal_cdev_update(struct thermal_cooling_device *cdev)
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{
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struct thermal_instance *instance;
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unsigned long target = 0;
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/* Make sure cdev enters the deepest cooling state */
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list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
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dev_dbg(&cdev->device, "zone%d->target=%lu\n",
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instance->tz->id, instance->target);
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if (instance->target == THERMAL_NO_TARGET)
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continue;
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if (instance->target > target)
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target = instance->target;
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}
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thermal_cdev_set_cur_state(cdev, target);
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trace_cdev_update(cdev, target);
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dev_dbg(&cdev->device, "set to state %lu\n", target);
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}
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/**
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* thermal_cdev_update - update cooling device state if needed
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* @cdev: pointer to struct thermal_cooling_device
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*
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* Update the cooling device state if there is a need.
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*/
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void thermal_cdev_update(struct thermal_cooling_device *cdev)
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{
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mutex_lock(&cdev->lock);
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if (!cdev->updated) {
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__thermal_cdev_update(cdev);
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cdev->updated = true;
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}
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mutex_unlock(&cdev->lock);
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}
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/**
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* thermal_zone_get_slope - return the slope attribute of the thermal zone
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* @tz: thermal zone device with the slope attribute
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*
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* Return: If the thermal zone device has a slope attribute, return it, else
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* return 1.
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*/
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int thermal_zone_get_slope(struct thermal_zone_device *tz)
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{
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if (tz && tz->tzp)
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return tz->tzp->slope;
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return 1;
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}
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EXPORT_SYMBOL_GPL(thermal_zone_get_slope);
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/**
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* thermal_zone_get_offset - return the offset attribute of the thermal zone
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* @tz: thermal zone device with the offset attribute
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*
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* Return: If the thermal zone device has a offset attribute, return it, else
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* return 0.
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*/
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int thermal_zone_get_offset(struct thermal_zone_device *tz)
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{
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if (tz && tz->tzp)
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return tz->tzp->offset;
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return 0;
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}
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EXPORT_SYMBOL_GPL(thermal_zone_get_offset);
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