thermal: int340x: Introduce processor reporting device

obj-$(CONFIG_INT340X_THERMAL)	+= int3400_thermal.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_ACPI_THERMAL_REL)	+= acpi_thermal_rel.o

/*

 * processor_thermal_device.c

 * Copyright (c) 2014, 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/pci.h>

#include <linux/platform_device.h>

#include <linux/acpi.h>

/* Broadwell-U/HSB thermal reporting device */

#define PCI_DEVICE_ID_PROC_BDW_THERMAL	0x1603

#define PCI_DEVICE_ID_PROC_HSB_THERMAL	0x0A03

/* Braswell thermal reporting device */

#define PCI_DEVICE_ID_PROC_BSW_THERMAL	0x22DC

struct power_config {

	u32	index;

	u32	min_uw;

	u32	max_uw;

	u32	tmin_us;

	u32	tmax_us;

	u32	step_uw;

};

struct proc_thermal_device {

	struct device *dev;

	struct acpi_device *adev;

	struct power_config power_limits[2];

};

enum proc_thermal_emum_mode_type {

	PROC_THERMAL_NONE,

	PROC_THERMAL_PCI,

	PROC_THERMAL_PLATFORM_DEV

};

/*

 * We can have only one type of enumeration, PCI or Platform,

 * not both. So we don't need instance specific data.

 */

static enum proc_thermal_emum_mode_type proc_thermal_emum_mode =

							PROC_THERMAL_NONE;

#define POWER_LIMIT_SHOW(index, suffix) \

static ssize_t power_limit_##index##_##suffix##_show(struct device *dev, \

					struct device_attribute *attr, \

					char *buf) \

{ \

	struct pci_dev *pci_dev; \

	struct platform_device *pdev; \

	struct proc_thermal_device *proc_dev; \

\

	if (proc_thermal_emum_mode == PROC_THERMAL_PLATFORM_DEV) { \

		pdev = to_platform_device(dev); \

		proc_dev = platform_get_drvdata(pdev); \

	} else { \

		pci_dev = to_pci_dev(dev); \

		proc_dev = pci_get_drvdata(pci_dev); \

	} \

	return sprintf(buf, "%lu\n",\

	(unsigned long)proc_dev->power_limits[index].suffix * 1000); \

}

POWER_LIMIT_SHOW(0, min_uw)

POWER_LIMIT_SHOW(0, max_uw)

POWER_LIMIT_SHOW(0, step_uw)

POWER_LIMIT_SHOW(0, tmin_us)

POWER_LIMIT_SHOW(0, tmax_us)

POWER_LIMIT_SHOW(1, min_uw)

POWER_LIMIT_SHOW(1, max_uw)

POWER_LIMIT_SHOW(1, step_uw)

POWER_LIMIT_SHOW(1, tmin_us)

POWER_LIMIT_SHOW(1, tmax_us)

static DEVICE_ATTR_RO(power_limit_0_min_uw);

static DEVICE_ATTR_RO(power_limit_0_max_uw);

static DEVICE_ATTR_RO(power_limit_0_step_uw);

static DEVICE_ATTR_RO(power_limit_0_tmin_us);

static DEVICE_ATTR_RO(power_limit_0_tmax_us);

static DEVICE_ATTR_RO(power_limit_1_min_uw);

static DEVICE_ATTR_RO(power_limit_1_max_uw);

static DEVICE_ATTR_RO(power_limit_1_step_uw);

static DEVICE_ATTR_RO(power_limit_1_tmin_us);

static DEVICE_ATTR_RO(power_limit_1_tmax_us);

static struct attribute *power_limit_attrs[] = {

	&dev_attr_power_limit_0_min_uw.attr,

	&dev_attr_power_limit_1_min_uw.attr,

	&dev_attr_power_limit_0_max_uw.attr,

	&dev_attr_power_limit_1_max_uw.attr,

	&dev_attr_power_limit_0_step_uw.attr,

	&dev_attr_power_limit_1_step_uw.attr,

	&dev_attr_power_limit_0_tmin_us.attr,

	&dev_attr_power_limit_1_tmin_us.attr,

	&dev_attr_power_limit_0_tmax_us.attr,

	&dev_attr_power_limit_1_tmax_us.attr,

	NULL

};

static struct attribute_group power_limit_attribute_group = {

	.attrs = power_limit_attrs,

	.name = "power_limits"

};

static int proc_thermal_add(struct device *dev,

			    struct proc_thermal_device **priv)

{

	struct proc_thermal_device *proc_priv;

	struct acpi_device *adev;

	acpi_status status;

	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };

	union acpi_object *elements, *ppcc;

	union acpi_object *p;

	int i;

	adev = ACPI_COMPANION(dev);

	status = acpi_evaluate_object(adev->handle, "PPCC", NULL, &buf);

	if (ACPI_FAILURE(status))

		return -ENODEV;

	p = buf.pointer;

	if (!p || (p->type != ACPI_TYPE_PACKAGE)) {

		dev_err(dev, "Invalid PPCC data\n");

		return -EFAULT;

	}

	if (!p->package.count) {

		dev_err(dev, "Invalid PPCC package size\n");

		return -EFAULT;

	}

	proc_priv = devm_kzalloc(dev, sizeof(*proc_priv), GFP_KERNEL);

	if (!proc_priv)

		return -ENOMEM;

	proc_priv->dev = dev;

	proc_priv->adev = adev;

	for (i = 0; i < min((int)p->package.count - 1, 2); ++i) {

		elements = &(p->package.elements[i+1]);

		if (elements->type != ACPI_TYPE_PACKAGE ||

		    elements->package.count != 6)

			return -EFAULT;

		ppcc = elements->package.elements;

		proc_priv->power_limits[i].index = ppcc[0].integer.value;

		proc_priv->power_limits[i].min_uw = ppcc[1].integer.value;

		proc_priv->power_limits[i].max_uw = ppcc[2].integer.value;

		proc_priv->power_limits[i].tmin_us = ppcc[3].integer.value;

		proc_priv->power_limits[i].tmax_us = ppcc[4].integer.value;

		proc_priv->power_limits[i].step_uw = ppcc[5].integer.value;

	}

	*priv = proc_priv;

	return sysfs_create_group(&dev->kobj,

				  &power_limit_attribute_group);

}

void proc_thermal_remove(struct proc_thermal_device *proc_priv)

{

	sysfs_remove_group(&proc_priv->dev->kobj,

			   &power_limit_attribute_group);

}

static int int3401_add(struct platform_device *pdev)

{

	struct proc_thermal_device *proc_priv;

	int ret;

	if (proc_thermal_emum_mode == PROC_THERMAL_PCI) {

		dev_err(&pdev->dev, "error: enumerated as PCI dev\n");

		return -ENODEV;

	}

	ret = proc_thermal_add(&pdev->dev, &proc_priv);

	if (ret)

		return ret;

	platform_set_drvdata(pdev, proc_priv);

	proc_thermal_emum_mode = PROC_THERMAL_PLATFORM_DEV;

	return 0;

}

static int int3401_remove(struct platform_device *pdev)

{

	proc_thermal_remove(platform_get_drvdata(pdev));

	return 0;

}

static int  proc_thermal_pci_probe(struct pci_dev *pdev,

				   const struct pci_device_id *unused)

{

	struct proc_thermal_device *proc_priv;

	int ret;

	if (proc_thermal_emum_mode == PROC_THERMAL_PLATFORM_DEV) {

		dev_err(&pdev->dev, "error: enumerated as platform dev\n");

		return -ENODEV;

	}

	ret = pci_enable_device(pdev);

	if (ret < 0) {

		dev_err(&pdev->dev, "error: could not enable device\n");

		return ret;

	}

	ret = proc_thermal_add(&pdev->dev, &proc_priv);

	if (ret) {

		pci_disable_device(pdev);

		return ret;

	}

	pci_set_drvdata(pdev, proc_priv);

	proc_thermal_emum_mode = PROC_THERMAL_PCI;

	return 0;

}

static void  proc_thermal_pci_remove(struct pci_dev *pdev)

{

	proc_thermal_remove(pci_get_drvdata(pdev));

	pci_disable_device(pdev);

}

static const struct pci_device_id proc_thermal_pci_ids[] = {

	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BDW_THERMAL)},

	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_HSB_THERMAL)},

	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BSW_THERMAL)},

	{ 0, },

};

MODULE_DEVICE_TABLE(pci, proc_thermal_pci_ids);

static struct pci_driver proc_thermal_pci_driver = {

	.name		= "proc_thermal",

	.probe		= proc_thermal_pci_probe,

	.remove		= proc_thermal_pci_remove,

	.id_table	= proc_thermal_pci_ids,

};

static const struct acpi_device_id int3401_device_ids[] = {

	{"INT3401", 0},

	{"", 0},

};

MODULE_DEVICE_TABLE(acpi, int3401_device_ids);

static struct platform_driver int3401_driver = {

	.probe = int3401_add,

	.remove = int3401_remove,

	.driver = {

		.name = "int3401 thermal",

		.acpi_match_table = int3401_device_ids,

	},

};

static int __init proc_thermal_init(void)

{

	int ret;

	ret = platform_driver_register(&int3401_driver);

	if (ret)

		return ret;

	ret = pci_register_driver(&proc_thermal_pci_driver);

	return ret;

}

static void __exit proc_thermal_exit(void)

{

	platform_driver_unregister(&int3401_driver);

	pci_unregister_driver(&proc_thermal_pci_driver);

}

module_init(proc_thermal_init);

module_exit(proc_thermal_exit);

MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");

MODULE_DESCRIPTION("Processor Thermal Reporting Device Driver");

MODULE_LICENSE("GPL v2");