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/*
* INT3400 thermal driver
*
* Copyright (C) 2014, Intel Corporation
* Authors: Zhang Rui <rui.zhang@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>
struct art {
acpi_handle source;
acpi_handle target;
u64 weight;
u64 ac0_max;
u64 ac1_max;
u64 ac2_max;
u64 ac3_max;
u64 ac4_max;
u64 ac5_max;
u64 ac6_max;
u64 ac7_max;
u64 ac8_max;
u64 ac9_max;
};
struct trt {
acpi_handle source;
acpi_handle target;
u64 influence;
u64 sampling_period;
u64 reverved1;
u64 reverved2;
u64 reverved3;
u64 reverved4;
};
struct int3400_thermal_priv {
struct acpi_device *adev;
int art_count;
struct art *arts;
int trt_count;
struct trt *trts;
};
static int parse_art(struct int3400_thermal_priv *priv)
{
acpi_handle handle = priv->adev->handle;
acpi_status status;
int result = 0;
int i;
struct acpi_device *adev;
union acpi_object *p;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_buffer element = { 0, NULL };
struct acpi_buffer art_format = {
sizeof("RRNNNNNNNNNNN"), "RRNNNNNNNNNNN" };
if (!acpi_has_method(handle, "_ART"))
return 0;
status = acpi_evaluate_object(handle, "_ART", NULL, &buffer);
if (ACPI_FAILURE(status))
return -ENODEV;
p = buffer.pointer;
if (!p || (p->type != ACPI_TYPE_PACKAGE)) {
pr_err("Invalid _ART data\n");
result = -EFAULT;
goto end;
}
/* ignore p->package.elements[0], as this is _ART Revision field */
priv->art_count = p->package.count - 1;
priv->arts = kzalloc(sizeof(struct art) * priv->art_count, GFP_KERNEL);
if (!priv->arts) {
result = -ENOMEM;
goto end;
}
for (i = 0; i < priv->art_count; i++) {
struct art *art = &(priv->arts[i]);
element.length = sizeof(struct art);
element.pointer = art;
status = acpi_extract_package(&(p->package.elements[i + 1]),
&art_format, &element);
if (ACPI_FAILURE(status)) {
pr_err("Invalid _ART data");
result = -EFAULT;
kfree(priv->arts);
goto end;
}
result = acpi_bus_get_device(art->source, &adev);
if (!result)
acpi_create_platform_device(adev, NULL);
else
pr_warn("Failed to get source ACPI device\n");
result = acpi_bus_get_device(art->target, &adev);
if (!result)
acpi_create_platform_device(adev, NULL);
else
pr_warn("Failed to get source ACPI device\n");
}
end:
kfree(buffer.pointer);
return result;
}
static int parse_trt(struct int3400_thermal_priv *priv)
{
acpi_handle handle = priv->adev->handle;
acpi_status status;
int result = 0;
int i;
struct acpi_device *adev;
union acpi_object *p;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_buffer element = { 0, NULL };
struct acpi_buffer trt_format = { sizeof("RRNNNNNN"), "RRNNNNNN" };
if (!acpi_has_method(handle, "_TRT"))
return 0;
status = acpi_evaluate_object(handle, "_TRT", NULL, &buffer);
if (ACPI_FAILURE(status))
return -ENODEV;
p = buffer.pointer;
if (!p || (p->type != ACPI_TYPE_PACKAGE)) {
pr_err("Invalid _TRT data\n");
result = -EFAULT;
goto end;
}
priv->trt_count = p->package.count;
priv->trts = kzalloc(sizeof(struct trt) * priv->trt_count, GFP_KERNEL);
if (!priv->trts) {
result = -ENOMEM;
goto end;
}
for (i = 0; i < priv->trt_count; i++) {
struct trt *trt = &(priv->trts[i]);
element.length = sizeof(struct trt);
element.pointer = trt;
status = acpi_extract_package(&(p->package.elements[i]),
&trt_format, &element);
if (ACPI_FAILURE(status)) {
pr_err("Invalid _ART data");
result = -EFAULT;
kfree(priv->trts);
goto end;
}
result = acpi_bus_get_device(trt->source, &adev);
if (!result)
acpi_create_platform_device(adev, NULL);
else
pr_warn("Failed to get source ACPI device\n");
result = acpi_bus_get_device(trt->target, &adev);
if (!result)
acpi_create_platform_device(adev, NULL);
else
pr_warn("Failed to get target ACPI device\n");
}
end:
kfree(buffer.pointer);
return result;
}
static int int3400_thermal_probe(struct platform_device *pdev)
{
struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
struct int3400_thermal_priv *priv;
int result;
if (!adev)
return -ENODEV;
priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->adev = adev;
result = parse_art(priv);
if (result)
goto free_priv;
result = parse_trt(priv);
if (result)
goto free_art;
platform_set_drvdata(pdev, priv);
return 0;
free_art:
kfree(priv->arts);
free_priv:
kfree(priv);
return result;
}
static int int3400_thermal_remove(struct platform_device *pdev)
{
struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
kfree(priv->trts);
kfree(priv->arts);
kfree(priv);
return 0;
}
static const struct acpi_device_id int3400_thermal_match[] = {
{"INT3400", 0},
{}
};
MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);
static struct platform_driver int3400_thermal_driver = {
.probe = int3400_thermal_probe,
.remove = int3400_thermal_remove,
.driver = {
.name = "int3400 thermal",
.owner = THIS_MODULE,
.acpi_match_table = ACPI_PTR(int3400_thermal_match),
},
};
module_platform_driver(int3400_thermal_driver);
MODULE_DESCRIPTION("INT3400 Thermal driver");
MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
MODULE_LICENSE("GPL");
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