Commit 7a0e3974 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki

thermal: ACPI: Add ACPI trip point routines

Add library routines to populate a generic thermal trip point
structure with data obtained by evaluating a specific object in the
ACPI Namespace.
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Co-developed-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Tested-by: default avatarSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
parent 40dc1929
...@@ -76,6 +76,10 @@ config THERMAL_OF ...@@ -76,6 +76,10 @@ config THERMAL_OF
Say 'Y' here if you need to build thermal infrastructure Say 'Y' here if you need to build thermal infrastructure
based on device tree. based on device tree.
config THERMAL_ACPI
depends on ACPI
bool
config THERMAL_WRITABLE_TRIPS config THERMAL_WRITABLE_TRIPS
bool "Enable writable trip points" bool "Enable writable trip points"
help help
......
...@@ -13,6 +13,7 @@ thermal_sys-$(CONFIG_THERMAL_NETLINK) += thermal_netlink.o ...@@ -13,6 +13,7 @@ thermal_sys-$(CONFIG_THERMAL_NETLINK) += thermal_netlink.o
# interface to/from other layers providing sensors # interface to/from other layers providing sensors
thermal_sys-$(CONFIG_THERMAL_HWMON) += thermal_hwmon.o thermal_sys-$(CONFIG_THERMAL_HWMON) += thermal_hwmon.o
thermal_sys-$(CONFIG_THERMAL_OF) += thermal_of.o thermal_sys-$(CONFIG_THERMAL_OF) += thermal_of.o
thermal_sys-$(CONFIG_THERMAL_ACPI) += thermal_acpi.o
# governors # governors
thermal_sys-$(CONFIG_THERMAL_GOV_FAIR_SHARE) += gov_fair_share.o thermal_sys-$(CONFIG_THERMAL_GOV_FAIR_SHARE) += gov_fair_share.o
......
// 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);
...@@ -346,6 +346,14 @@ int thermal_zone_get_num_trips(struct thermal_zone_device *tz); ...@@ -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); 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 #ifdef CONFIG_THERMAL
struct thermal_zone_device *thermal_zone_device_register(const char *, int, int, struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
void *, struct thermal_zone_device_ops *, void *, struct thermal_zone_device_ops *,
......
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