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/*
* int340x_thermal_zone.c
* Copyright (c) 2015, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/thermal.h>
#include "int340x_thermal_zone.h"
static int int340x_thermal_get_zone_temp(struct thermal_zone_device *zone,
unsigned long *temp)
{
struct int34x_thermal_zone *d = zone->devdata;
unsigned long long tmp;
acpi_status status;
if (d->override_ops && d->override_ops->get_temp)
return d->override_ops->get_temp(zone, temp);
status = acpi_evaluate_integer(d->adev->handle, "_TMP", NULL, &tmp);
if (ACPI_FAILURE(status))
return -EIO;
/* _TMP returns the temperature in tenths of degrees Kelvin */
*temp = DECI_KELVIN_TO_MILLICELSIUS(tmp);
return 0;
}
static int int340x_thermal_get_trip_temp(struct thermal_zone_device *zone,
int trip, unsigned long *temp)
{
struct int34x_thermal_zone *d = zone->devdata;
int i;
if (d->override_ops && d->override_ops->get_trip_temp)
return d->override_ops->get_trip_temp(zone, trip, temp);
if (trip < d->aux_trip_nr)
*temp = d->aux_trips[trip];
else if (trip == d->crt_trip_id)
*temp = d->crt_temp;
else if (trip == d->psv_trip_id)
*temp = d->psv_temp;
else if (trip == d->hot_trip_id)
*temp = d->hot_temp;
else {
for (i = 0; i < INT340X_THERMAL_MAX_ACT_TRIP_COUNT; i++) {
if (d->act_trips[i].valid &&
d->act_trips[i].id == trip) {
*temp = d->act_trips[i].temp;
break;
}
}
if (i == INT340X_THERMAL_MAX_ACT_TRIP_COUNT)
return -EINVAL;
}
return 0;
}
static int int340x_thermal_get_trip_type(struct thermal_zone_device *zone,
int trip,
enum thermal_trip_type *type)
{
struct int34x_thermal_zone *d = zone->devdata;
int i;
if (d->override_ops && d->override_ops->get_trip_type)
return d->override_ops->get_trip_type(zone, trip, type);
if (trip < d->aux_trip_nr)
*type = THERMAL_TRIP_PASSIVE;
else if (trip == d->crt_trip_id)
*type = THERMAL_TRIP_CRITICAL;
else if (trip == d->hot_trip_id)
*type = THERMAL_TRIP_HOT;
else if (trip == d->psv_trip_id)
*type = THERMAL_TRIP_PASSIVE;
else {
for (i = 0; i < INT340X_THERMAL_MAX_ACT_TRIP_COUNT; i++) {
if (d->act_trips[i].valid &&
d->act_trips[i].id == trip) {
*type = THERMAL_TRIP_ACTIVE;
break;
}
}
if (i == INT340X_THERMAL_MAX_ACT_TRIP_COUNT)
return -EINVAL;
}
return 0;
}
static int int340x_thermal_set_trip_temp(struct thermal_zone_device *zone,
int trip, unsigned long temp)
{
struct int34x_thermal_zone *d = zone->devdata;
acpi_status status;
char name[10];
if (d->override_ops && d->override_ops->set_trip_temp)
return d->override_ops->set_trip_temp(zone, trip, temp);
snprintf(name, sizeof(name), "PAT%d", trip);
status = acpi_execute_simple_method(d->adev->handle, name,
MILLICELSIUS_TO_DECI_KELVIN(temp));
if (ACPI_FAILURE(status))
return -EIO;
d->aux_trips[trip] = temp;
return 0;
}
static int int340x_thermal_get_trip_hyst(struct thermal_zone_device *zone,
int trip, unsigned long *temp)
{
struct int34x_thermal_zone *d = zone->devdata;
acpi_status status;
unsigned long long hyst;
if (d->override_ops && d->override_ops->get_trip_hyst)
return d->override_ops->get_trip_hyst(zone, trip, temp);
status = acpi_evaluate_integer(d->adev->handle, "GTSH", NULL, &hyst);
if (ACPI_FAILURE(status))
return -EIO;
*temp = hyst * 100;
return 0;
}
static struct thermal_zone_device_ops int340x_thermal_zone_ops = {
.get_temp = int340x_thermal_get_zone_temp,
.get_trip_temp = int340x_thermal_get_trip_temp,
.get_trip_type = int340x_thermal_get_trip_type,
.set_trip_temp = int340x_thermal_set_trip_temp,
.get_trip_hyst = int340x_thermal_get_trip_hyst,
};
static int int340x_thermal_get_trip_config(acpi_handle handle, char *name,
unsigned long *temp)
{
unsigned long long r;
acpi_status status;
status = acpi_evaluate_integer(handle, name, NULL, &r);
if (ACPI_FAILURE(status))
return -EIO;
*temp = DECI_KELVIN_TO_MILLICELSIUS(r);
return 0;
}
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,
struct thermal_zone_device_ops *override_ops)
{
struct int34x_thermal_zone *int34x_thermal_zone;
acpi_status status;
unsigned long long trip_cnt;
int trip_mask = 0, i;
int ret;
int34x_thermal_zone = kzalloc(sizeof(*int34x_thermal_zone),
GFP_KERNEL);
if (!int34x_thermal_zone)
return ERR_PTR(-ENOMEM);
int34x_thermal_zone->adev = adev;
int34x_thermal_zone->override_ops = override_ops;
status = acpi_evaluate_integer(adev->handle, "PATC", NULL, &trip_cnt);
if (ACPI_FAILURE(status))
trip_cnt = 0;
else {
int34x_thermal_zone->aux_trips = kzalloc(
sizeof(*int34x_thermal_zone->aux_trips) *
trip_cnt, GFP_KERNEL);
if (!int34x_thermal_zone->aux_trips) {
ret = -ENOMEM;
goto free_mem;
}
trip_mask = BIT(trip_cnt) - 1;
int34x_thermal_zone->aux_trip_nr = trip_cnt;
}
int34x_thermal_zone->crt_trip_id = -1;
if (!int340x_thermal_get_trip_config(adev->handle, "_CRT",
&int34x_thermal_zone->crt_temp))
int34x_thermal_zone->crt_trip_id = trip_cnt++;
int34x_thermal_zone->hot_trip_id = -1;
if (!int340x_thermal_get_trip_config(adev->handle, "_HOT",
&int34x_thermal_zone->hot_temp))
int34x_thermal_zone->hot_trip_id = trip_cnt++;
int34x_thermal_zone->psv_trip_id = -1;
if (!int340x_thermal_get_trip_config(adev->handle, "_PSV",
&int34x_thermal_zone->psv_temp))
int34x_thermal_zone->psv_trip_id = trip_cnt++;
for (i = 0; i < INT340X_THERMAL_MAX_ACT_TRIP_COUNT; i++) {
char name[5] = { '_', 'A', 'C', '0' + i, '\0' };
if (int340x_thermal_get_trip_config(adev->handle, name,
&int34x_thermal_zone->act_trips[i].temp))
break;
int34x_thermal_zone->act_trips[i].id = trip_cnt++;
int34x_thermal_zone->act_trips[i].valid = true;
}
int34x_thermal_zone->zone = thermal_zone_device_register(
acpi_device_bid(adev),
trip_cnt,
trip_mask, int34x_thermal_zone,
&int340x_thermal_zone_ops,
&int340x_thermal_params,
0, 0);
if (IS_ERR(int34x_thermal_zone->zone)) {
ret = PTR_ERR(int34x_thermal_zone->zone);
goto free_mem;
}
return int34x_thermal_zone;
free_mem:
kfree(int34x_thermal_zone);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(int340x_thermal_zone_add);
void int340x_thermal_zone_remove(struct int34x_thermal_zone
*int34x_thermal_zone)
{
thermal_zone_device_unregister(int34x_thermal_zone->zone);
kfree(int34x_thermal_zone);
}
EXPORT_SYMBOL_GPL(int340x_thermal_zone_remove);
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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