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// 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 = {
.governor_name = "user_space",
.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 = kzalloc(sizeof(*zone_trips) * (trip_cnt + INT340X_THERMAL_MAX_TRIP_COUNT),
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");
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