Commit a3c89334 authored by Aaron Lu's avatar Aaron Lu Committed by Rafael J. Wysocki

Thermal / ACPI / video: add INT3406 thermal driver

INT3406 ACPI device object resembles an ACPI video output device, but its
_BCM is said to be deprecated and should not be used. So we will make
use of the raw interface to do the actual cooling.
Signed-off-by: default avatarAaron Lu <aaron.lu@intel.com>
Acked-by: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 05950094
......@@ -338,31 +338,9 @@ config INTEL_QUARK_DTS_THERMAL
hot & critical. The critical trip point default value is set by
underlying BIOS/Firmware.
config INT340X_THERMAL
tristate "ACPI INT340X thermal drivers"
depends on X86 && ACPI
select THERMAL_GOV_USER_SPACE
select ACPI_THERMAL_REL
select ACPI_FAN
select INTEL_SOC_DTS_IOSF_CORE
select THERMAL_WRITABLE_TRIPS
help
Newer laptops and tablets that use ACPI may have thermal sensors and
other devices with thermal control capabilities outside the core
CPU/SOC, for thermal safety reasons.
They are exposed for the OS to use via the INT3400 ACPI device object
as the master, and INT3401~INT340B ACPI device objects as the slaves.
Enable this to expose the temperature information and cooling ability
from these objects to userspace via the normal thermal framework.
This means that a wide range of applications and GUI widgets can show
the information to the user or use this information for making
decisions. For example, the Intel Thermal Daemon can use this
information to allow the user to select his laptop to run without
turning on the fans.
config ACPI_THERMAL_REL
tristate
depends on ACPI
menu "ACPI INT340X thermal drivers"
source drivers/thermal/int340x_thermal/Kconfig
endmenu
config INTEL_PCH_THERMAL
tristate "Intel PCH Thermal Reporting Driver"
......
#
# ACPI INT340x thermal drivers configuration
#
config INT340X_THERMAL
tristate "ACPI INT340X thermal drivers"
depends on X86 && ACPI
select THERMAL_GOV_USER_SPACE
select ACPI_THERMAL_REL
select ACPI_FAN
select INTEL_SOC_DTS_IOSF_CORE
help
Newer laptops and tablets that use ACPI may have thermal sensors and
other devices with thermal control capabilities outside the core
CPU/SOC, for thermal safety reasons.
They are exposed for the OS to use via the INT3400 ACPI device object
as the master, and INT3401~INT340B ACPI device objects as the slaves.
Enable this to expose the temperature information and cooling ability
from these objects to userspace via the normal thermal framework.
This means that a wide range of applications and GUI widgets can show
the information to the user or use this information for making
decisions. For example, the Intel Thermal Daemon can use this
information to allow the user to select his laptop to run without
turning on the fans.
config ACPI_THERMAL_REL
tristate
depends on ACPI
if INT340X_THERMAL
config INT3406_THERMAL
tristate "ACPI INT3406 display thermal driver"
depends on ACPI_VIDEO
help
The display thermal device represents the LED/LCD display panel
that may or may not include touch support. The main function of
the display thermal device is to allow control of the display
brightness in order to address a thermal condition or to reduce
power consumed by display device.
endif
......@@ -3,4 +3,5 @@ obj-$(CONFIG_INT340X_THERMAL) += int340x_thermal_zone.o
obj-$(CONFIG_INT340X_THERMAL) += int3402_thermal.o
obj-$(CONFIG_INT340X_THERMAL) += int3403_thermal.o
obj-$(CONFIG_INT340X_THERMAL) += processor_thermal_device.o
obj-$(CONFIG_INT3406_THERMAL) += int3406_thermal.o
obj-$(CONFIG_ACPI_THERMAL_REL) += acpi_thermal_rel.o
/*
* INT3406 thermal driver for display participant device
*
* Copyright (C) 2016, Intel Corporation
* Authors: Aaron Lu <aaron.lu@intel.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/acpi.h>
#include <linux/backlight.h>
#include <linux/thermal.h>
#include <acpi/video.h>
#define INT3406_BRIGHTNESS_LIMITS_CHANGED 0x80
struct int3406_thermal_data {
int upper_limit;
int upper_limit_index;
int lower_limit;
int lower_limit_index;
acpi_handle handle;
struct acpi_video_device_brightness *br;
struct backlight_device *raw_bd;
struct thermal_cooling_device *cooling_dev;
};
static int int3406_thermal_to_raw(int level, struct int3406_thermal_data *d)
{
int max_level = d->br->levels[d->br->count - 1];
int raw_max = d->raw_bd->props.max_brightness;
return level * raw_max / max_level;
}
static int int3406_thermal_to_acpi(int level, struct int3406_thermal_data *d)
{
int raw_max = d->raw_bd->props.max_brightness;
int max_level = d->br->levels[d->br->count - 1];
return level * max_level / raw_max;
}
static int
int3406_thermal_get_max_state(struct thermal_cooling_device *cooling_dev,
unsigned long *state)
{
struct int3406_thermal_data *d = cooling_dev->devdata;
int index = d->lower_limit_index ? d->lower_limit_index : 2;
*state = d->br->count - 1 - index;
return 0;
}
static int
int3406_thermal_set_cur_state(struct thermal_cooling_device *cooling_dev,
unsigned long state)
{
struct int3406_thermal_data *d = cooling_dev->devdata;
int level, raw_level;
if (state > d->br->count - 3)
return -EINVAL;
state = d->br->count - 1 - state;
level = d->br->levels[state];
if ((d->upper_limit && level > d->upper_limit) ||
(d->lower_limit && level < d->lower_limit))
return -EINVAL;
raw_level = int3406_thermal_to_raw(level, d);
return backlight_device_set_brightness(d->raw_bd, raw_level);
}
static int
int3406_thermal_get_cur_state(struct thermal_cooling_device *cooling_dev,
unsigned long *state)
{
struct int3406_thermal_data *d = cooling_dev->devdata;
int raw_level, level, i;
int *levels = d->br->levels;
raw_level = d->raw_bd->props.brightness;
level = int3406_thermal_to_acpi(raw_level, d);
/*
* There is no 1:1 mapping between the firmware interface level with the
* raw interface level, we will have to find one that is close enough.
*/
for (i = 2; i < d->br->count; i++) {
if (level < levels[i]) {
if (i == 2)
break;
if ((level - levels[i - 1]) < (levels[i] - level))
i--;
break;
}
}
*state = d->br->count - 1 - i;
return 0;
}
static const struct thermal_cooling_device_ops video_cooling_ops = {
.get_max_state = int3406_thermal_get_max_state,
.get_cur_state = int3406_thermal_get_cur_state,
.set_cur_state = int3406_thermal_set_cur_state,
};
static int int3406_thermal_get_index(int *array, int nr, int value)
{
int i;
for (i = 0; i < nr; i++) {
if (array[i] == value)
break;
}
return i == nr ? -ENOENT : i;
}
static void int3406_thermal_get_limit(struct int3406_thermal_data *d)
{
acpi_status status;
unsigned long long lower_limit, upper_limit;
int index;
status = acpi_evaluate_integer(d->handle, "DDDL", NULL, &lower_limit);
if (ACPI_SUCCESS(status)) {
index = int3406_thermal_get_index(d->br->levels, d->br->count,
lower_limit);
if (index > 0) {
d->lower_limit = (int)lower_limit;
d->lower_limit_index = index;
}
}
status = acpi_evaluate_integer(d->handle, "DDPC", NULL, &upper_limit);
if (ACPI_SUCCESS(status)) {
index = int3406_thermal_get_index(d->br->levels, d->br->count,
upper_limit);
if (index > 0) {
d->upper_limit = (int)upper_limit;
d->upper_limit_index = index;
}
}
}
static void int3406_notify(acpi_handle handle, u32 event, void *data)
{
if (event == INT3406_BRIGHTNESS_LIMITS_CHANGED)
int3406_thermal_get_limit(data);
}
static int int3406_thermal_probe(struct platform_device *pdev)
{
struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
struct int3406_thermal_data *d;
struct backlight_device *bd;
int ret;
if (!ACPI_HANDLE(&pdev->dev))
return -ENODEV;
d = devm_kzalloc(&pdev->dev, sizeof(*d), GFP_KERNEL);
if (!d)
return -ENOMEM;
d->handle = ACPI_HANDLE(&pdev->dev);
bd = backlight_device_get_by_type(BACKLIGHT_RAW);
if (!bd)
return -ENODEV;
d->raw_bd = bd;
ret = acpi_video_get_levels(ACPI_COMPANION(&pdev->dev), &d->br);
if (ret)
return ret;
int3406_thermal_get_limit(d);
d->cooling_dev = thermal_cooling_device_register(acpi_device_bid(adev),
d, &video_cooling_ops);
if (IS_ERR(d->cooling_dev))
goto err;
ret = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
int3406_notify, d);
if (ret)
goto err_cdev;
platform_set_drvdata(pdev, d);
return 0;
err_cdev:
thermal_cooling_device_unregister(d->cooling_dev);
err:
kfree(d->br);
return -ENODEV;
}
static int int3406_thermal_remove(struct platform_device *pdev)
{
struct int3406_thermal_data *d = platform_get_drvdata(pdev);
thermal_cooling_device_unregister(d->cooling_dev);
kfree(d->br);
return 0;
}
static const struct acpi_device_id int3406_thermal_match[] = {
{"INT3406", 0},
{}
};
MODULE_DEVICE_TABLE(acpi, int3406_thermal_match);
static struct platform_driver int3406_thermal_driver = {
.probe = int3406_thermal_probe,
.remove = int3406_thermal_remove,
.driver = {
.name = "int3406 thermal",
.owner = THIS_MODULE,
.acpi_match_table = int3406_thermal_match,
},
};
module_platform_driver(int3406_thermal_driver);
MODULE_DESCRIPTION("INT3406 Thermal driver");
MODULE_LICENSE("GPL v2");
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