diff options
Diffstat (limited to 'drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c')
| -rw-r--r-- | drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c b/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c new file mode 100644 index 000000000000..3d9efe69d562 --- /dev/null +++ b/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c @@ -0,0 +1,242 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * int340x_thermal_zone.c + * Copyright (c) 2015, Intel Corporation. + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/acpi.h> +#include <linux/thermal.h> +#include <linux/units.h> +#include "int340x_thermal_zone.h" + +static int int340x_thermal_get_zone_temp(struct thermal_zone_device *zone, + int *temp) +{ + struct int34x_thermal_zone *d = thermal_zone_device_priv(zone); + unsigned long long tmp; + acpi_status status; + + status = acpi_evaluate_integer(d->adev->handle, "_TMP", NULL, &tmp); + if (ACPI_FAILURE(status)) + return -EIO; + + if (d->lpat_table) { + int conv_temp; + + conv_temp = acpi_lpat_raw_to_temp(d->lpat_table, (int)tmp); + if (conv_temp < 0) + return conv_temp; + + *temp = conv_temp * 10; + } else { + /* _TMP returns the temperature in tenths of degrees Kelvin */ + *temp = deci_kelvin_to_millicelsius(tmp); + } + + return 0; +} + +static int int340x_thermal_set_trip_temp(struct thermal_zone_device *zone, + const struct thermal_trip *trip, int temp) +{ + struct int34x_thermal_zone *d = thermal_zone_device_priv(zone); + unsigned int trip_index = THERMAL_TRIP_PRIV_TO_INT(trip->priv); + char name[] = {'P', 'A', 'T', '0' + trip_index, '\0'}; + acpi_status status; + + if (trip_index > 9) + return -EINVAL; + + status = acpi_execute_simple_method(d->adev->handle, name, + millicelsius_to_deci_kelvin(temp)); + if (ACPI_FAILURE(status)) + return -EIO; + + return 0; +} + +static void int340x_thermal_critical(struct thermal_zone_device *zone) +{ + dev_dbg(thermal_zone_device(zone), "%s: critical temperature reached\n", + thermal_zone_device_type(zone)); +} + +static int int340x_thermal_read_trips(struct acpi_device *zone_adev, + struct thermal_trip *zone_trips, + int trip_cnt) +{ + int i, ret; + + ret = thermal_acpi_critical_trip_temp(zone_adev, + &zone_trips[trip_cnt].temperature); + if (!ret) { + zone_trips[trip_cnt].type = THERMAL_TRIP_CRITICAL; + trip_cnt++; + } + + ret = thermal_acpi_hot_trip_temp(zone_adev, + &zone_trips[trip_cnt].temperature); + if (!ret) { + zone_trips[trip_cnt].type = THERMAL_TRIP_HOT; + trip_cnt++; + } + + ret = thermal_acpi_passive_trip_temp(zone_adev, + &zone_trips[trip_cnt].temperature); + if (!ret) { + zone_trips[trip_cnt].type = THERMAL_TRIP_PASSIVE; + trip_cnt++; + } + + for (i = 0; i < INT340X_THERMAL_MAX_ACT_TRIP_COUNT; i++) { + ret = thermal_acpi_active_trip_temp(zone_adev, i, + &zone_trips[trip_cnt].temperature); + if (ret) + break; + + zone_trips[trip_cnt].type = THERMAL_TRIP_ACTIVE; + zone_trips[trip_cnt].priv = THERMAL_INT_TO_TRIP_PRIV(i); + trip_cnt++; + } + + return trip_cnt; +} + +static struct thermal_zone_params int340x_thermal_params = { + .no_hwmon = true, +}; + +struct int34x_thermal_zone *int340x_thermal_zone_add(struct acpi_device *adev, + int (*get_temp) (struct thermal_zone_device *, int *)) +{ + const struct thermal_zone_device_ops zone_ops = { + .set_trip_temp = int340x_thermal_set_trip_temp, + .critical = int340x_thermal_critical, + .get_temp = get_temp ? get_temp : int340x_thermal_get_zone_temp, + }; + struct int34x_thermal_zone *int34x_zone; + struct thermal_trip *zone_trips; + unsigned long long trip_cnt = 0; + unsigned long long hyst; + acpi_status status; + int i, ret; + + int34x_zone = kzalloc(sizeof(*int34x_zone), GFP_KERNEL); + if (!int34x_zone) + return ERR_PTR(-ENOMEM); + + int34x_zone->adev = adev; + + status = acpi_evaluate_integer(adev->handle, "PATC", NULL, &trip_cnt); + if (ACPI_SUCCESS(status)) + int34x_zone->aux_trip_nr = trip_cnt; + + zone_trips = kcalloc(trip_cnt + INT340X_THERMAL_MAX_TRIP_COUNT, + sizeof(*zone_trips), GFP_KERNEL); + if (!zone_trips) { + ret = -ENOMEM; + goto err_trips_alloc; + } + + for (i = 0; i < trip_cnt; i++) { + zone_trips[i].type = THERMAL_TRIP_PASSIVE; + zone_trips[i].temperature = THERMAL_TEMP_INVALID; + zone_trips[i].flags = THERMAL_TRIP_FLAG_RW_TEMP; + zone_trips[i].priv = THERMAL_INT_TO_TRIP_PRIV(i); + } + + trip_cnt = int340x_thermal_read_trips(adev, zone_trips, trip_cnt); + + status = acpi_evaluate_integer(adev->handle, "GTSH", NULL, &hyst); + if (ACPI_SUCCESS(status)) + hyst *= 100; + else + hyst = 0; + + for (i = 0; i < trip_cnt; ++i) + zone_trips[i].hysteresis = hyst; + + int34x_zone->lpat_table = acpi_lpat_get_conversion_table(adev->handle); + + int34x_zone->zone = thermal_zone_device_register_with_trips( + acpi_device_bid(adev), + zone_trips, trip_cnt, + int34x_zone, + &zone_ops, + &int340x_thermal_params, + 0, 0); + kfree(zone_trips); + + if (IS_ERR(int34x_zone->zone)) { + ret = PTR_ERR(int34x_zone->zone); + goto err_thermal_zone; + } + ret = thermal_zone_device_enable(int34x_zone->zone); + if (ret) + goto err_enable; + + return int34x_zone; + +err_enable: + thermal_zone_device_unregister(int34x_zone->zone); +err_thermal_zone: + acpi_lpat_free_conversion_table(int34x_zone->lpat_table); +err_trips_alloc: + kfree(int34x_zone); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(int340x_thermal_zone_add); + +void int340x_thermal_zone_remove(struct int34x_thermal_zone *int34x_zone) +{ + thermal_zone_device_unregister(int34x_zone->zone); + acpi_lpat_free_conversion_table(int34x_zone->lpat_table); + kfree(int34x_zone); +} +EXPORT_SYMBOL_GPL(int340x_thermal_zone_remove); + +static int int340x_update_one_trip(struct thermal_trip *trip, void *arg) +{ + struct int34x_thermal_zone *int34x_zone = arg; + struct acpi_device *zone_adev = int34x_zone->adev; + int temp, err; + + switch (trip->type) { + case THERMAL_TRIP_CRITICAL: + err = thermal_acpi_critical_trip_temp(zone_adev, &temp); + break; + case THERMAL_TRIP_HOT: + err = thermal_acpi_hot_trip_temp(zone_adev, &temp); + break; + case THERMAL_TRIP_PASSIVE: + err = thermal_acpi_passive_trip_temp(zone_adev, &temp); + break; + case THERMAL_TRIP_ACTIVE: + err = thermal_acpi_active_trip_temp(zone_adev, + THERMAL_TRIP_PRIV_TO_INT(trip->priv), + &temp); + break; + default: + err = -ENODEV; + } + if (err) + temp = THERMAL_TEMP_INVALID; + + thermal_zone_set_trip_temp(int34x_zone->zone, trip, temp); + + return 0; +} + +void int340x_thermal_update_trips(struct int34x_thermal_zone *int34x_zone) +{ + thermal_zone_for_each_trip(int34x_zone->zone, int340x_update_one_trip, + int34x_zone); +} +EXPORT_SYMBOL_GPL(int340x_thermal_update_trips); + +MODULE_AUTHOR("Aaron Lu <aaron.lu@intel.com>"); +MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); +MODULE_DESCRIPTION("Intel INT340x common thermal zone handler"); +MODULE_LICENSE("GPL v2"); |