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261 lines
6.6 KiB
261 lines
6.6 KiB
// 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 <[email protected]> |
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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 <[email protected]> |
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* Copyright (C) 2008 Sujith Thomas <[email protected]> |
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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 <trace/events/thermal.h> |
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#include "thermal_core.h" |
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int get_tz_trend(struct thermal_zone_device *tz, int trip) |
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{ |
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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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EXPORT_SYMBOL(get_tz_trend); |
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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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* 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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enum thermal_trip_type type; |
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if (!tz || IS_ERR(tz) || !tz->ops->get_temp) |
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goto exit; |
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mutex_lock(&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->trips; count++) { |
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ret = tz->ops->get_trip_type(tz, count, &type); |
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if (!ret && type == THERMAL_TRIP_CRITICAL) { |
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ret = tz->ops->get_trip_temp(tz, count, |
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&crit_temp); |
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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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mutex_unlock(&tz->lock); |
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exit: |
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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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/** |
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* thermal_zone_set_trips - Computes the next trip points for the driver |
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* @tz: a pointer to a thermal zone device structure |
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* |
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* The function computes the next temperature boundaries by browsing |
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* the trip points. The result is the closer low and high trip points |
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* to the current temperature. These values are passed to the backend |
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* driver to let it set its own notification mechanism (usually an |
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* interrupt). |
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* |
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* It does not return a value |
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*/ |
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void thermal_zone_set_trips(struct thermal_zone_device *tz) |
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{ |
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int low = -INT_MAX; |
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int high = INT_MAX; |
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int trip_temp, hysteresis; |
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int i, ret; |
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mutex_lock(&tz->lock); |
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if (!tz->ops->set_trips || !tz->ops->get_trip_hyst) |
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goto exit; |
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for (i = 0; i < tz->trips; i++) { |
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int trip_low; |
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tz->ops->get_trip_temp(tz, i, &trip_temp); |
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tz->ops->get_trip_hyst(tz, i, &hysteresis); |
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trip_low = trip_temp - hysteresis; |
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if (trip_low < tz->temperature && trip_low > low) |
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low = trip_low; |
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if (trip_temp > tz->temperature && trip_temp < high) |
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high = trip_temp; |
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} |
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/* No need to change trip points */ |
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if (tz->prev_low_trip == low && tz->prev_high_trip == high) |
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goto exit; |
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tz->prev_low_trip = low; |
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tz->prev_high_trip = high; |
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dev_dbg(&tz->device, |
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"new temperature boundaries: %d < x < %d\n", low, high); |
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/* |
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* Set a temperature window. When this window is left the driver |
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* must inform the thermal core via thermal_zone_device_update. |
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*/ |
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ret = tz->ops->set_trips(tz, low, high); |
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if (ret) |
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dev_err(&tz->device, "Failed to set trips: %d\n", ret); |
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exit: |
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mutex_unlock(&tz->lock); |
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} |
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void thermal_set_delay_jiffies(unsigned long *delay_jiffies, int delay_ms) |
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{ |
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*delay_jiffies = msecs_to_jiffies(delay_ms); |
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if (delay_ms > 1000) |
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*delay_jiffies = round_jiffies(*delay_jiffies); |
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} |
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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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EXPORT_SYMBOL(thermal_cdev_update); |
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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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