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/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpigen.h>
#include <assert.h>
#include <commonlib/bsd/helpers.h>
#include <console/console.h>
#include <device/device.h>
#include <stdlib.h>
#include <string.h>
#include "chip.h"
#define TZ_DEVICE_PATH "\\_TZ"
/* These defaults should be good enough for most systems */
#define DEFAULT_TC1 2
#define DEFAULT_TC2 5
#define DEFAULT_TSP 10
#define CELSIUS_TO_DECI_KELVIN(temp_c) ((temp_c) * 10 + 2731)
#define SECONDS_TO_DECI_SECONDS(s) ((s) * 10)
static const char *thermal_zone_acpi_name(const struct device *dev)
{
char *name;
if (dev->path.type != DEVICE_PATH_GENERIC)
return NULL;
name = malloc(ACPI_NAME_BUFFER_SIZE);
snprintf(name, ACPI_NAME_BUFFER_SIZE, "TM%02X", dev->path.generic.id);
return name;
}
static void thermal_zone_fill_ssdt(const struct device *dev)
{
struct drivers_acpi_thermal_zone_config *config = config_of(dev);
const char *scope;
const char *name;
assert(dev->path.type == DEVICE_PATH_GENERIC);
if (config->use_acpi1_thermal_zone_scope)
scope = TZ_DEVICE_PATH;
else
scope = acpi_device_scope(dev);
name = acpi_device_name(dev);
assert(name);
assert(scope);
if (!config->temperature_controller) {
printk(BIOS_ERR, "%s: missing temperature_controller\n", dev_path(dev));
return;
}
printk(BIOS_INFO, "%s.%s: %s at %s\n", scope, name, dev->chip_ops->name, dev_path(dev));
acpigen_write_scope(scope);
acpigen_write_thermal_zone(name);
if (config->description)
acpigen_write_name_string("_STR", config->description);
if (config->polling_period)
acpigen_write_name_integer(
"_TZP", SECONDS_TO_DECI_SECONDS(config->polling_period));
if (config->critical_temperature)
acpigen_write_name_integer(
"_CRT", CELSIUS_TO_DECI_KELVIN(config->critical_temperature));
if (config->hibernate_temperature)
acpigen_write_name_integer(
"_HOT", CELSIUS_TO_DECI_KELVIN(config->hibernate_temperature));
if (config->passive_config.temperature) {
acpigen_write_name_integer(
"_PSV", CELSIUS_TO_DECI_KELVIN(config->passive_config.temperature));
/*
* The linux kernel currently has an artificial limit of 10 on the number of
* references that can be returned in a list. If we don't respect this limit,
* then the passive threshold won't work.
*
* See https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/third_party/kernel/v5.10/include/acpi/acpi_bus.h;l=19
*/
acpigen_write_processor_package("_PSL", 0, MIN(10, dev_count_cpu()));
acpigen_write_name_integer("_TC1", config->passive_config.time_constant_1
?: DEFAULT_TC1);
acpigen_write_name_integer("_TC2", config->passive_config.time_constant_2
?: DEFAULT_TC2);
acpigen_write_name_integer(
"_TSP",
SECONDS_TO_DECI_SECONDS(config->passive_config.time_sampling_period
?: DEFAULT_TSP));
}
/*
* Method (_TMP) {
* Return (<path>.TMP(<sensor_id>))
* }
*/
acpigen_write_method_serialized("_TMP", 0);
acpigen_emit_byte(RETURN_OP);
acpigen_emit_namestring(acpi_device_path_join(config->temperature_controller, "TMP"));
acpigen_write_integer(config->sensor_id);
acpigen_write_method_end();
acpigen_write_thermal_zone_end();
acpigen_write_scope_end();
}
static struct device_operations thermal_zone_ops = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
.acpi_name = thermal_zone_acpi_name,
.acpi_fill_ssdt = thermal_zone_fill_ssdt,
};
static void thermal_zone_enable_dev(struct device *dev)
{
dev->ops = &thermal_zone_ops;
}
struct chip_operations drivers_acpi_thermal_zone_ops = {
CHIP_NAME("ACPI Thermal Zone")
.enable_dev = thermal_zone_enable_dev,
};
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