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/*
* ACPI INT3403 thermal driver
* Copyright (c) 2013, 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/types.h>
#include <linux/acpi.h>
#include <linux/thermal.h>
#define INT3403_TYPE_SENSOR 0x03
#define INT3403_PERF_CHANGED_EVENT 0x80
#define INT3403_THERMAL_EVENT 0x90
#define DECI_KELVIN_TO_MILLI_CELSIUS(t, off) (((t) - (off)) * 100)
#define KELVIN_OFFSET 2732
#define MILLI_CELSIUS_TO_DECI_KELVIN(t, off) (((t) / 100) + (off))
#define ACPI_INT3403_CLASS "int3403"
#define ACPI_INT3403_FILE_STATE "state"
struct int3403_sensor {
struct thermal_zone_device *tzone;
unsigned long *thresholds;
};
static int sys_get_curr_temp(struct thermal_zone_device *tzone,
unsigned long *temp)
{
struct acpi_device *device = tzone->devdata;
unsigned long long tmp;
acpi_status status;
status = acpi_evaluate_integer(device->handle, "_TMP", NULL, &tmp);
if (ACPI_FAILURE(status))
return -EIO;
*temp = DECI_KELVIN_TO_MILLI_CELSIUS(tmp, KELVIN_OFFSET);
return 0;
}
static int sys_get_trip_hyst(struct thermal_zone_device *tzone,
int trip, unsigned long *temp)
{
struct acpi_device *device = tzone->devdata;
unsigned long long hyst;
acpi_status status;
status = acpi_evaluate_integer(device->handle, "GTSH", NULL, &hyst);
if (ACPI_FAILURE(status))
return -EIO;
/*
* Thermal hysteresis represents a temperature difference.
* Kelvin and Celsius have same degree size. So the
* conversion here between tenths of degree Kelvin unit
* and Milli-Celsius unit is just to multiply 100.
*/
*temp = hyst * 100;
return 0;
}
static int sys_get_trip_temp(struct thermal_zone_device *tzone,
int trip, unsigned long *temp)
{
struct acpi_device *device = tzone->devdata;
struct int3403_sensor *obj = acpi_driver_data(device);
/*
* get_trip_temp is a mandatory callback but
* PATx method doesn't return any value, so return
* cached value, which was last set from user space.
*/
*temp = obj->thresholds[trip];
return 0;
}
static int sys_get_trip_type(struct thermal_zone_device *thermal,
int trip, enum thermal_trip_type *type)
{
/* Mandatory callback, may not mean much here */
*type = THERMAL_TRIP_PASSIVE;
return 0;
}
int sys_set_trip_temp(struct thermal_zone_device *tzone, int trip,
unsigned long temp)
{
struct acpi_device *device = tzone->devdata;
acpi_status status;
char name[10];
int ret = 0;
struct int3403_sensor *obj = acpi_driver_data(device);
snprintf(name, sizeof(name), "PAT%d", trip);
if (acpi_has_method(device->handle, name)) {
status = acpi_execute_simple_method(device->handle, name,
MILLI_CELSIUS_TO_DECI_KELVIN(temp,
KELVIN_OFFSET));
if (ACPI_FAILURE(status))
ret = -EIO;
else
obj->thresholds[trip] = temp;
} else {
ret = -EIO;
dev_err(&device->dev, "sys_set_trip_temp: method not found\n");
}
return ret;
}
static struct thermal_zone_device_ops tzone_ops = {
.get_temp = sys_get_curr_temp,
.get_trip_temp = sys_get_trip_temp,
.get_trip_type = sys_get_trip_type,
.set_trip_temp = sys_set_trip_temp,
.get_trip_hyst = sys_get_trip_hyst,
};
static void acpi_thermal_notify(struct acpi_device *device, u32 event)
{
struct int3403_sensor *obj;
if (!device)
return;
obj = acpi_driver_data(device);
if (!obj)
return;
switch (event) {
case INT3403_PERF_CHANGED_EVENT:
break;
case INT3403_THERMAL_EVENT:
thermal_zone_device_update(obj->tzone);
break;
default:
dev_err(&device->dev, "Unsupported event [0x%x]\n", event);
break;
}
}
static int acpi_int3403_add(struct acpi_device *device)
{
int result = 0;
unsigned long long ptyp;
acpi_status status;
struct int3403_sensor *obj;
unsigned long long trip_cnt;
int trip_mask = 0;
if (!device)
return -EINVAL;
status = acpi_evaluate_integer(device->handle, "PTYP", NULL, &ptyp);
if (ACPI_FAILURE(status))
return -EINVAL;
if (ptyp != INT3403_TYPE_SENSOR)
return -EINVAL;
obj = devm_kzalloc(&device->dev, sizeof(*obj), GFP_KERNEL);
if (!obj)
return -ENOMEM;
device->driver_data = obj;
status = acpi_evaluate_integer(device->handle, "PATC", NULL,
&trip_cnt);
if (ACPI_FAILURE(status))
trip_cnt = 0;
if (trip_cnt) {
/* We have to cache, thresholds can't be readback */
obj->thresholds = devm_kzalloc(&device->dev,
sizeof(*obj->thresholds) * trip_cnt,
GFP_KERNEL);
if (!obj->thresholds)
return -ENOMEM;
trip_mask = BIT(trip_cnt) - 1;
}
obj->tzone = thermal_zone_device_register(acpi_device_bid(device),
trip_cnt, trip_mask, device, &tzone_ops,
NULL, 0, 0);
if (IS_ERR(obj->tzone)) {
result = PTR_ERR(obj->tzone);
return result;
}
strcpy(acpi_device_name(device), "INT3403");
strcpy(acpi_device_class(device), ACPI_INT3403_CLASS);
return 0;
}
static int acpi_int3403_remove(struct acpi_device *device)
{
struct int3403_sensor *obj;
obj = acpi_driver_data(device);
thermal_zone_device_unregister(obj->tzone);
return 0;
}
ACPI_MODULE_NAME("int3403");
static const struct acpi_device_id int3403_device_ids[] = {
{"INT3403", 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, int3403_device_ids);
static struct acpi_driver acpi_int3403_driver = {
.name = "INT3403",
.class = ACPI_INT3403_CLASS,
.ids = int3403_device_ids,
.ops = {
.add = acpi_int3403_add,
.remove = acpi_int3403_remove,
.notify = acpi_thermal_notify,
},
};
module_acpi_driver(acpi_int3403_driver);
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ACPI INT3403 thermal driver");
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