| /* 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, |
| }; |