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It is slightly better to make the ACPI thermal helper functions retrieve the trip point temperature only instead of doing the full trip point initialization, because they are also used for updating some already registered trip points, in which case initializing a new trip just in order to update the temperature of an existing one is somewhat wasteful. Modify the ACPI thermal helpers accordingly and update their users. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
118 lines
3.8 KiB
C
118 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2023 Linaro Limited
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* Copyright 2023 Intel Corporation
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*
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* Library routines for populating a generic thermal trip point structure
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* with data obtained by evaluating a specific object in the ACPI Namespace.
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*/
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#include <linux/acpi.h>
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#include <linux/units.h>
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#include "thermal_core.h"
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/*
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* Minimum temperature for full military grade is 218°K (-55°C) and
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* max temperature is 448°K (175°C). We can consider those values as
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* the boundaries for the [trips] temperature returned by the
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* firmware. Any values out of these boundaries may be considered
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* bogus and we can assume the firmware has no data to provide.
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*/
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#define TEMP_MIN_DECIK 2180
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#define TEMP_MAX_DECIK 4480
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static int thermal_acpi_trip_temp(struct acpi_device *adev, char *obj_name,
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int *ret_temp)
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{
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unsigned long long temp;
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acpi_status status;
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status = acpi_evaluate_integer(adev->handle, obj_name, NULL, &temp);
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if (ACPI_FAILURE(status)) {
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acpi_handle_debug(adev->handle, "%s evaluation failed\n", obj_name);
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return -ENODATA;
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}
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if (temp >= TEMP_MIN_DECIK && temp <= TEMP_MAX_DECIK) {
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*ret_temp = deci_kelvin_to_millicelsius(temp);
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} else {
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acpi_handle_debug(adev->handle, "%s result %llu out of range\n",
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obj_name, temp);
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*ret_temp = THERMAL_TEMP_INVALID;
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}
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return 0;
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}
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/**
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* thermal_acpi_active_trip_temp - Retrieve active trip point temperature
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* @adev: Target thermal zone ACPI device object.
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* @id: Active cooling level (0 - 9).
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* @ret_temp: Address to store the retrieved temperature value on success.
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*
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* Evaluate the _ACx object for the thermal zone represented by @adev to obtain
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* the temperature of the active cooling trip point corresponding to the active
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* cooling level given by @id.
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*
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* Return 0 on success or a negative error value on failure.
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*/
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int thermal_acpi_active_trip_temp(struct acpi_device *adev, int id, int *ret_temp)
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{
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char obj_name[] = {'_', 'A', 'C', '0' + id, '\0'};
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if (id < 0 || id > 9)
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return -EINVAL;
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return thermal_acpi_trip_temp(adev, obj_name, ret_temp);
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}
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EXPORT_SYMBOL_GPL(thermal_acpi_active_trip_temp);
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/**
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* thermal_acpi_passive_trip_temp - Retrieve passive trip point temperature
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* @adev: Target thermal zone ACPI device object.
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* @ret_temp: Address to store the retrieved temperature value on success.
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*
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* Evaluate the _PSV object for the thermal zone represented by @adev to obtain
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* the temperature of the passive cooling trip point.
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*
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* Return 0 on success or -ENODATA on failure.
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*/
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int thermal_acpi_passive_trip_temp(struct acpi_device *adev, int *ret_temp)
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{
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return thermal_acpi_trip_temp(adev, "_PSV", ret_temp);
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}
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EXPORT_SYMBOL_GPL(thermal_acpi_passive_trip_temp);
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/**
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* thermal_acpi_hot_trip_temp - Retrieve hot trip point temperature
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* @adev: Target thermal zone ACPI device object.
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* @ret_temp: Address to store the retrieved temperature value on success.
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*
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* Evaluate the _HOT object for the thermal zone represented by @adev to obtain
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* the temperature of the trip point at which the system is expected to be put
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* into the S4 sleep state.
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*
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* Return 0 on success or -ENODATA on failure.
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*/
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int thermal_acpi_hot_trip_temp(struct acpi_device *adev, int *ret_temp)
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{
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return thermal_acpi_trip_temp(adev, "_HOT", ret_temp);
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}
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EXPORT_SYMBOL_GPL(thermal_acpi_hot_trip_temp);
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/**
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* thermal_acpi_critical_trip_temp - Retrieve critical trip point temperature
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* @adev: Target thermal zone ACPI device object.
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* @ret_temp: Address to store the retrieved temperature value on success.
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*
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* Evaluate the _CRT object for the thermal zone represented by @adev to obtain
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* the temperature of the critical cooling trip point.
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*
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* Return 0 on success or -ENODATA on failure.
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*/
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int thermal_acpi_critical_trip_temp(struct acpi_device *adev, int *ret_temp)
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{
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return thermal_acpi_trip_temp(adev, "_CRT", ret_temp);
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}
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EXPORT_SYMBOL_GPL(thermal_acpi_critical_trip_temp);
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