thermal: ACPI: Add ACPI trip point routines (7a0e3974) · Commits · EulixOS / Software / Kernel

drivers/thermal/Kconfig

+4 −0

Original line number	Diff line number	Diff line
		@@ -76,6 +76,10 @@ config THERMAL_OF
		Say 'Y' here if you need to build thermal infrastructure
		based on device tree.

		config THERMAL_ACPI
		depends on ACPI
		bool

		config THERMAL_WRITABLE_TRIPS
		bool "Enable writable trip points"
		help

drivers/thermal/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -13,6 +13,7 @@ thermal_sys-$(CONFIG_THERMAL_NETLINK) += thermal_netlink.o
		# interface to/from other layers providing sensors
		thermal_sys-$(CONFIG_THERMAL_HWMON) += thermal_hwmon.o
		thermal_sys-$(CONFIG_THERMAL_OF) += thermal_of.o
		thermal_sys-$(CONFIG_THERMAL_ACPI) += thermal_acpi.o

		# governors
		thermal_sys-$(CONFIG_THERMAL_GOV_FAIR_SHARE) += gov_fair_share.o

drivers/thermal/thermal_acpi.c

0 → 100644

+150 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/*
		* Copyright 2023 Linaro Limited
		* Copyright 2023 Intel Corporation
		*
		* Library routines for populating a generic thermal trip point structure
		* with data obtained by evaluating a specific object in the ACPI Namespace.
		*/
		#include <linux/acpi.h>
		#include <linux/units.h>

		#include "thermal_core.h"

		/*
		* Minimum temperature for full military grade is 218°K (-55°C) and
		* max temperature is 448°K (175°C). We can consider those values as
		* the boundaries for the [trips] temperature returned by the
		* firmware. Any values out of these boundaries may be considered
		* bogus and we can assume the firmware has no data to provide.
		*/
		#define TEMP_MIN_DECIK 2180
		#define TEMP_MAX_DECIK 4480

		static int thermal_acpi_trip_init(struct acpi_device *adev,
		enum thermal_trip_type type, int id,
		struct thermal_trip *trip)
		{
		unsigned long long temp;
		acpi_status status;
		char obj_name[5];

		switch (type) {
		case THERMAL_TRIP_ACTIVE:
		if (id < 0 \|\| id > 9)
		return -EINVAL;

		obj_name[1] = 'A';
		obj_name[2] = 'C';
		obj_name[3] = '0' + id;
		break;
		case THERMAL_TRIP_PASSIVE:
		obj_name[1] = 'P';
		obj_name[2] = 'S';
		obj_name[3] = 'V';
		break;
		case THERMAL_TRIP_HOT:
		obj_name[1] = 'H';
		obj_name[2] = 'O';
		obj_name[3] = 'T';
		break;
		case THERMAL_TRIP_CRITICAL:
		obj_name[1] = 'C';
		obj_name[2] = 'R';
		obj_name[3] = 'T';
		break;
		}

		obj_name[0] = '_';
		obj_name[4] = '\0';

		status = acpi_evaluate_integer(adev->handle, obj_name, NULL, &temp);
		if (ACPI_FAILURE(status)) {
		acpi_handle_debug(adev->handle, "%s evaluation failed\n", obj_name);
		return -ENODATA;
		}

		if (temp < TEMP_MIN_DECIK \|\| temp >= TEMP_MAX_DECIK) {
		acpi_handle_debug(adev->handle, "%s result %llu out of range\n",
		obj_name, temp);
		return -ENODATA;
		}

		trip->temperature = deci_kelvin_to_millicelsius(temp);
		trip->hysteresis = 0;
		trip->type = type;

		return 0;
		}

		/**
		* thermal_acpi_trip_active - Get the specified active trip point
		* @adev: Thermal zone ACPI device object to get the description from.
		* @id: Active cooling level (0 - 9).
		* @trip: Trip point structure to be populated on success.
		*
		* Evaluate the _ACx object for the thermal zone represented by @adev to obtain
		* the temperature of the active cooling trip point corresponding to the active
		* cooling level given by @id and initialize @trip as an active trip point using
		* that temperature value.
		*
		* Return 0 on success or a negative error value on failure.
		*/
		int thermal_acpi_trip_active(struct acpi_device *adev, int id,
		struct thermal_trip *trip)
		{
		return thermal_acpi_trip_init(adev, THERMAL_TRIP_ACTIVE, id, trip);
		}
		EXPORT_SYMBOL_GPL(thermal_acpi_trip_active);

		/**
		* thermal_acpi_trip_passive - Get the passive trip point
		* @adev: Thermal zone ACPI device object to get the description from.
		* @trip: Trip point structure to be populated on success.
		*
		* Evaluate the _PSV object for the thermal zone represented by @adev to obtain
		* the temperature of the passive cooling trip point and initialize @trip as a
		* passive trip point using that temperature value.
		*
		* Return 0 on success or -ENODATA on failure.
		*/
		int thermal_acpi_trip_passive(struct acpi_device adev, struct thermal_trip trip)
		{
		return thermal_acpi_trip_init(adev, THERMAL_TRIP_PASSIVE, INT_MAX, trip);
		}
		EXPORT_SYMBOL_GPL(thermal_acpi_trip_passive);

		/**
		* thermal_acpi_trip_hot - Get the near critical trip point
		* @adev: the ACPI device to get the description from.
		* @trip: a &struct thermal_trip to be filled if the function succeed.
		*
		* Evaluate the _HOT object for the thermal zone represented by @adev to obtain
		* the temperature of the trip point at which the system is expected to be put
		* into the S4 sleep state and initialize @trip as a hot trip point using that
		* temperature value.
		*
		* Return 0 on success or -ENODATA on failure.
		*/
		int thermal_acpi_trip_hot(struct acpi_device adev, struct thermal_trip trip)
		{
		return thermal_acpi_trip_init(adev, THERMAL_TRIP_HOT, INT_MAX, trip);
		}
		EXPORT_SYMBOL_GPL(thermal_acpi_trip_hot);

		/**
		* thermal_acpi_trip_critical - Get the critical trip point
		* @adev: the ACPI device to get the description from.
		* @trip: a &struct thermal_trip to be filled if the function succeed.
		*
		* Evaluate the _CRT object for the thermal zone represented by @adev to obtain
		* the temperature of the critical cooling trip point and initialize @trip as a
		* critical trip point using that temperature value.
		*
		* Return 0 on success or -ENODATA on failure.
		*/
		int thermal_acpi_trip_critical(struct acpi_device adev, struct thermal_trip trip)
		{
		return thermal_acpi_trip_init(adev, THERMAL_TRIP_CRITICAL, INT_MAX, trip);
		}
		EXPORT_SYMBOL_GPL(thermal_acpi_trip_critical);

include/linux/thermal.h

+8 −0

Original line number	Diff line number	Diff line
		@@ -346,6 +346,14 @@ int thermal_zone_get_num_trips(struct thermal_zone_device *tz);

		int thermal_zone_get_crit_temp(struct thermal_zone_device tz, int temp);

		#ifdef CONFIG_THERMAL_ACPI
		int thermal_acpi_trip_active(struct acpi_device *adev, int id,
		struct thermal_trip *trip);
		int thermal_acpi_trip_passive(struct acpi_device adev, struct thermal_trip trip);
		int thermal_acpi_trip_hot(struct acpi_device adev, struct thermal_trip trip);
		int thermal_acpi_trip_critical(struct acpi_device adev, struct thermal_trip trip);
		#endif

		#ifdef CONFIG_THERMAL
		struct thermal_zone_device thermal_zone_device_register(const char , int, int,
		void , struct thermal_zone_device_ops ,