drivers/char/tpm/tpm_tis.c - third_party/linux - Git at Google

 /*
  * Copyright (C) 2005, 2006 IBM Corporation
  * Copyright (C) 2014, 2015 Intel Corporation
  *
  * Authors:
  * Leendert van Doorn <leendert@watson.ibm.com>
  * Kylene Hall <kjhall@us.ibm.com>
  *
  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
  *
  * Device driver for TCG/TCPA TPM (trusted platform module).
  * Specifications at www.trustedcomputinggroup.org
  *
  * This device driver implements the TPM interface as defined in
  * the TCG TPM Interface Spec version 1.2, revision 1.0.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation, version 2 of the
  * License.
  */
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/pnp.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/wait.h>
 #include <linux/acpi.h>
 #include <linux/freezer.h>
 #include "tpm.h"
 #include "tpm_tis_core.h"

 struct tpm_info {
 	struct resource res;
 	/* irq > 0 means: use irq $irq;
 	 * irq = 0 means: autoprobe for an irq;
 	 * irq = -1 means: no irq support
 	 */
 	int irq;
 };

 struct tpm_tis_tcg_phy {
 	struct tpm_tis_data priv;
 	void __iomem *iobase;
 };

 static inline struct tpm_tis_tcg_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *data)
 {
 	return container_of(data, struct tpm_tis_tcg_phy, priv);
 }

 static bool interrupts = true;
 module_param(interrupts, bool, 0444);
 MODULE_PARM_DESC(interrupts, "Enable interrupts");

 static bool itpm;
 module_param(itpm, bool, 0444);
 MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");

 static bool force;
 #ifdef CONFIG_X86
 module_param(force, bool, 0444);
 MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
 #endif

 #if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
 static int has_hid(struct acpi_device *dev, const char *hid)
 {
 	struct acpi_hardware_id *id;

 	list_for_each_entry(id, &dev->pnp.ids, list)
 		if (!strcmp(hid, id->id))
 			return 1;

 	return 0;
 }

 static inline int is_itpm(struct acpi_device *dev)
 {
 	return has_hid(dev, "INTC0102");
 }
 #else
 static inline int is_itpm(struct acpi_device *dev)
 {
 	return 0;
 }
 #endif

 static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
 			      u8 *result)
 {
 	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

 	while (len--)
 		*result++ = ioread8(phy->iobase + addr);
 	return 0;
 }

 static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
 			       u8 *value)
 {
 	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

 	while (len--)
 		iowrite8(*value++, phy->iobase + addr);
 	return 0;
 }

 static int tpm_tcg_read16(struct tpm_tis_data *data, u32 addr, u16 *result)
 {
 	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

 	*result = ioread16(phy->iobase + addr);
 	return 0;
 }

 static int tpm_tcg_read32(struct tpm_tis_data *data, u32 addr, u32 *result)
 {
 	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

 	*result = ioread32(phy->iobase + addr);
 	return 0;
 }

 static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value)
 {
 	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

 	iowrite32(value, phy->iobase + addr);
 	return 0;
 }

 static const struct tpm_tis_phy_ops tpm_tcg = {
 	.read_bytes = tpm_tcg_read_bytes,
 	.write_bytes = tpm_tcg_write_bytes,
 	.read16 = tpm_tcg_read16,
 	.read32 = tpm_tcg_read32,
 	.write32 = tpm_tcg_write32,
 };

 static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
 			acpi_handle acpi_dev_handle)
 {
 	struct tpm_tis_tcg_phy *phy;
 	int irq = -1;

 	phy = devm_kzalloc(dev, sizeof(struct tpm_tis_tcg_phy), GFP_KERNEL);
 	if (phy == NULL)
 		return -ENOMEM;

 	phy->iobase = devm_ioremap_resource(dev, &tpm_info->res);
 	if (IS_ERR(phy->iobase))
 		return PTR_ERR(phy->iobase);

 	if (interrupts)
 		irq = tpm_info->irq;

 	if (itpm)
 		phy->priv.flags |= TPM_TIS_ITPM_POSSIBLE;

 	return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg,
 				 acpi_dev_handle);
 }

 static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);

 static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
 			    const struct pnp_device_id *pnp_id)
 {
 	struct tpm_info tpm_info = {};
 	acpi_handle acpi_dev_handle = NULL;
 	struct resource *res;

 	res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0);
 	if (!res)
 		return -ENODEV;
 	tpm_info.res = *res;

 	if (pnp_irq_valid(pnp_dev, 0))
 		tpm_info.irq = pnp_irq(pnp_dev, 0);
 	else
 		tpm_info.irq = -1;

 	if (pnp_acpi_device(pnp_dev)) {
 		if (is_itpm(pnp_acpi_device(pnp_dev)))
 			itpm = true;

 		acpi_dev_handle = ACPI_HANDLE(&pnp_dev->dev);
 	}

 	return tpm_tis_init(&pnp_dev->dev, &tpm_info, acpi_dev_handle);
 }

 static struct pnp_device_id tpm_pnp_tbl[] = {
 	{"PNP0C31", 0},		/* TPM */
 	{"ATM1200", 0},		/* Atmel */
 	{"IFX0102", 0},		/* Infineon */
 	{"BCM0101", 0},		/* Broadcom */
 	{"BCM0102", 0},		/* Broadcom */
 	{"NSC1200", 0},		/* National */
 	{"ICO0102", 0},		/* Intel */
 	/* Add new here */
 	{"", 0},		/* User Specified */
 	{"", 0}			/* Terminator */
 };
 MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);

 static void tpm_tis_pnp_remove(struct pnp_dev *dev)
 {
 	struct tpm_chip *chip = pnp_get_drvdata(dev);

 	tpm_chip_unregister(chip);
 	tpm_tis_remove(chip);
 }

 static struct pnp_driver tis_pnp_driver = {
 	.name = "tpm_tis",
 	.id_table = tpm_pnp_tbl,
 	.probe = tpm_tis_pnp_init,
 	.remove = tpm_tis_pnp_remove,
 	.driver	= {
 		.pm = &tpm_tis_pm,
 	},
 };

 #define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
 module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
 		    sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
 MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");

 #ifdef CONFIG_ACPI
 static int tpm_check_resource(struct acpi_resource *ares, void *data)
 {
 	struct tpm_info *tpm_info = (struct tpm_info *) data;
 	struct resource res;

 	if (acpi_dev_resource_interrupt(ares, 0, &res))
 		tpm_info->irq = res.start;
 	else if (acpi_dev_resource_memory(ares, &res)) {
 		tpm_info->res = res;
 		tpm_info->res.name = NULL;
 	}

 	return 1;
 }

 static int tpm_tis_acpi_init(struct acpi_device *acpi_dev)
 {
 	struct acpi_table_tpm2 *tbl;
 	acpi_status st;
 	struct list_head resources;
 	struct tpm_info tpm_info = {};
 	int ret;

 	st = acpi_get_table(ACPI_SIG_TPM2, 1,
 			    (struct acpi_table_header **) &tbl);
 	if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) {
 		dev_err(&acpi_dev->dev,
 			FW_BUG "failed to get TPM2 ACPI table\n");
 		return -EINVAL;
 	}

 	if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
 		return -ENODEV;

 	INIT_LIST_HEAD(&resources);
 	tpm_info.irq = -1;
 	ret = acpi_dev_get_resources(acpi_dev, &resources, tpm_check_resource,
 				     &tpm_info);
 	if (ret < 0)
 		return ret;

 	acpi_dev_free_resource_list(&resources);

 	if (resource_type(&tpm_info.res) != IORESOURCE_MEM) {
 		dev_err(&acpi_dev->dev,
 			FW_BUG "TPM2 ACPI table does not define a memory resource\n");
 		return -EINVAL;
 	}

 	if (is_itpm(acpi_dev))
 		itpm = true;

 	return tpm_tis_init(&acpi_dev->dev, &tpm_info, acpi_dev->handle);
 }

 static int tpm_tis_acpi_remove(struct acpi_device *dev)
 {
 	struct tpm_chip *chip = dev_get_drvdata(&dev->dev);

 	tpm_chip_unregister(chip);
 	tpm_tis_remove(chip);

 	return 0;
 }

 static struct acpi_device_id tpm_acpi_tbl[] = {
 	{"MSFT0101", 0},	/* TPM 2.0 */
 	/* Add new here */
 	{"", 0},		/* User Specified */
 	{"", 0}			/* Terminator */
 };
 MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl);

 static struct acpi_driver tis_acpi_driver = {
 	.name = "tpm_tis",
 	.ids = tpm_acpi_tbl,
 	.ops = {
 		.add = tpm_tis_acpi_init,
 		.remove = tpm_tis_acpi_remove,
 	},
 	.drv = {
 		.pm = &tpm_tis_pm,
 	},
 };
 #endif

 static struct platform_device *force_pdev;

 static int tpm_tis_plat_probe(struct platform_device *pdev)
 {
 	struct tpm_info tpm_info = {};
 	struct resource *res;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (res == NULL) {
 		dev_err(&pdev->dev, "no memory resource defined\n");
 		return -ENODEV;
 	}
 	tpm_info.res = *res;

 	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	if (res) {
 		tpm_info.irq = res->start;
 	} else {
 		if (pdev == force_pdev)
 			tpm_info.irq = -1;
 		else
 			/* When forcing auto probe the IRQ */
 			tpm_info.irq = 0;
 	}

 	return tpm_tis_init(&pdev->dev, &tpm_info, NULL);
 }

 static int tpm_tis_plat_remove(struct platform_device *pdev)
 {
 	struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);

 	tpm_chip_unregister(chip);
 	tpm_tis_remove(chip);

 	return 0;
 }

 static struct platform_driver tis_drv = {
 	.probe = tpm_tis_plat_probe,
 	.remove = tpm_tis_plat_remove,
 	.driver = {
 		.name		= "tpm_tis",
 		.pm		= &tpm_tis_pm,
 	},
 };

 static int tpm_tis_force_device(void)
 {
 	struct platform_device *pdev;
 	static const struct resource x86_resources[] = {
 		{
 			.start = 0xFED40000,
 			.end = 0xFED40000 + TIS_MEM_LEN - 1,
 			.flags = IORESOURCE_MEM,
 		},
 	};

 	if (!force)
 		return 0;

 	/* The driver core will match the name tpm_tis of the device to
 	 * the tpm_tis platform driver and complete the setup via
 	 * tpm_tis_plat_probe
 	 */
 	pdev = platform_device_register_simple("tpm_tis", -1, x86_resources,
 					       ARRAY_SIZE(x86_resources));
 	if (IS_ERR(pdev))
 		return PTR_ERR(pdev);
 	force_pdev = pdev;

 	return 0;
 }

 static int __init init_tis(void)
 {
 	int rc;

 	rc = tpm_tis_force_device();
 	if (rc)
 		goto err_force;

 	rc = platform_driver_register(&tis_drv);
 	if (rc)
 		goto err_platform;

 #ifdef CONFIG_ACPI
 	rc = acpi_bus_register_driver(&tis_acpi_driver);
 	if (rc)
 		goto err_acpi;
 #endif

 	if (IS_ENABLED(CONFIG_PNP)) {
 		rc = pnp_register_driver(&tis_pnp_driver);
 		if (rc)
 			goto err_pnp;
 	}

 	return 0;

 err_pnp:
 #ifdef CONFIG_ACPI
 	acpi_bus_unregister_driver(&tis_acpi_driver);
 err_acpi:
 #endif
 	platform_device_unregister(force_pdev);
 err_platform:
 	if (force_pdev)
 		platform_device_unregister(force_pdev);
 err_force:
 	return rc;
 }

 static void __exit cleanup_tis(void)
 {
 	pnp_unregister_driver(&tis_pnp_driver);
 #ifdef CONFIG_ACPI
 	acpi_bus_unregister_driver(&tis_acpi_driver);
 #endif
 	platform_driver_unregister(&tis_drv);

 	if (force_pdev)
 		platform_device_unregister(force_pdev);
 }

 module_init(init_tis);
 module_exit(cleanup_tis);
 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
 MODULE_DESCRIPTION("TPM Driver");
 MODULE_VERSION("2.0");
 MODULE_LICENSE("GPL");
	/*
	* Copyright (C) 2005, 2006 IBM Corporation
	* Copyright (C) 2014, 2015 Intel Corporation
	*
	* Authors:
	* Leendert van Doorn <leendert@watson.ibm.com>
	* Kylene Hall <kjhall@us.ibm.com>
	*
	* Maintained by: <tpmdd-devel@lists.sourceforge.net>
	*
	* Device driver for TCG/TCPA TPM (trusted platform module).
	* Specifications at www.trustedcomputinggroup.org
	*
	* This device driver implements the TPM interface as defined in
	* the TCG TPM Interface Spec version 1.2, revision 1.0.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation, version 2 of the
	* License.
	*/
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/pnp.h>
	#include <linux/slab.h>
	#include <linux/interrupt.h>
	#include <linux/wait.h>
	#include <linux/acpi.h>
	#include <linux/freezer.h>
	#include "tpm.h"
	#include "tpm_tis_core.h"

	struct tpm_info {
	struct resource res;
	/* irq > 0 means: use irq $irq;
	* irq = 0 means: autoprobe for an irq;
	* irq = -1 means: no irq support
	*/
	int irq;
	};

	struct tpm_tis_tcg_phy {
	struct tpm_tis_data priv;
	void __iomem *iobase;
	};

	static inline struct tpm_tis_tcg_phy to_tpm_tis_tcg_phy(struct tpm_tis_data data)
	{
	return container_of(data, struct tpm_tis_tcg_phy, priv);
	}

	static bool interrupts = true;
	module_param(interrupts, bool, 0444);
	MODULE_PARM_DESC(interrupts, "Enable interrupts");

	static bool itpm;
	module_param(itpm, bool, 0444);
	MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");

	static bool force;
	#ifdef CONFIG_X86
	module_param(force, bool, 0444);
	MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
	#endif

	#if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
	static int has_hid(struct acpi_device dev, const char hid)
	{
	struct acpi_hardware_id *id;

	list_for_each_entry(id, &dev->pnp.ids, list)
	if (!strcmp(hid, id->id))
	return 1;

	return 0;
	}

	static inline int is_itpm(struct acpi_device *dev)
	{
	return has_hid(dev, "INTC0102");
	}
	#else
	static inline int is_itpm(struct acpi_device *dev)
	{
	return 0;
	}
	#endif

	static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
	u8 *result)
	{
	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

	while (len--)
	*result++ = ioread8(phy->iobase + addr);
	return 0;
	}

	static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
	u8 *value)
	{
	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

	while (len--)
	iowrite8(*value++, phy->iobase + addr);
	return 0;
	}

	static int tpm_tcg_read16(struct tpm_tis_data data, u32 addr, u16 result)
	{
	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

	*result = ioread16(phy->iobase + addr);
	return 0;
	}

	static int tpm_tcg_read32(struct tpm_tis_data data, u32 addr, u32 result)
	{
	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

	*result = ioread32(phy->iobase + addr);
	return 0;
	}

	static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value)
	{
	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

	iowrite32(value, phy->iobase + addr);
	return 0;
	}

	static const struct tpm_tis_phy_ops tpm_tcg = {
	.read_bytes = tpm_tcg_read_bytes,
	.write_bytes = tpm_tcg_write_bytes,
	.read16 = tpm_tcg_read16,
	.read32 = tpm_tcg_read32,
	.write32 = tpm_tcg_write32,
	};

	static int tpm_tis_init(struct device dev, struct tpm_info tpm_info,
	acpi_handle acpi_dev_handle)
	{
	struct tpm_tis_tcg_phy *phy;
	int irq = -1;

	phy = devm_kzalloc(dev, sizeof(struct tpm_tis_tcg_phy), GFP_KERNEL);
	if (phy == NULL)
	return -ENOMEM;

	phy->iobase = devm_ioremap_resource(dev, &tpm_info->res);
	if (IS_ERR(phy->iobase))
	return PTR_ERR(phy->iobase);

	if (interrupts)
	irq = tpm_info->irq;

	if (itpm)
	phy->priv.flags \|= TPM_TIS_ITPM_POSSIBLE;

	return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg,
	acpi_dev_handle);
	}

	static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);

	static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
	const struct pnp_device_id *pnp_id)
	{
	struct tpm_info tpm_info = {};
	acpi_handle acpi_dev_handle = NULL;
	struct resource *res;

	res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0);
	if (!res)
	return -ENODEV;
	tpm_info.res = *res;

	if (pnp_irq_valid(pnp_dev, 0))
	tpm_info.irq = pnp_irq(pnp_dev, 0);
	else
	tpm_info.irq = -1;

	if (pnp_acpi_device(pnp_dev)) {
	if (is_itpm(pnp_acpi_device(pnp_dev)))
	itpm = true;

	acpi_dev_handle = ACPI_HANDLE(&pnp_dev->dev);
	}

	return tpm_tis_init(&pnp_dev->dev, &tpm_info, acpi_dev_handle);
	}

	static struct pnp_device_id tpm_pnp_tbl[] = {
	{"PNP0C31", 0}, /* TPM */
	{"ATM1200", 0}, /* Atmel */
	{"IFX0102", 0}, /* Infineon */
	{"BCM0101", 0}, /* Broadcom */
	{"BCM0102", 0}, /* Broadcom */
	{"NSC1200", 0}, /* National */
	{"ICO0102", 0}, /* Intel */
	/* Add new here */
	{"", 0}, /* User Specified */
	{"", 0} /* Terminator */
	};
	MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);

	static void tpm_tis_pnp_remove(struct pnp_dev *dev)
	{
	struct tpm_chip *chip = pnp_get_drvdata(dev);

	tpm_chip_unregister(chip);
	tpm_tis_remove(chip);
	}

	static struct pnp_driver tis_pnp_driver = {
	.name = "tpm_tis",
	.id_table = tpm_pnp_tbl,
	.probe = tpm_tis_pnp_init,
	.remove = tpm_tis_pnp_remove,
	.driver = {
	.pm = &tpm_tis_pm,
	},
	};

	#define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
	module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
	sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
	MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");

	#ifdef CONFIG_ACPI
	static int tpm_check_resource(struct acpi_resource ares, void data)
	{
	struct tpm_info tpm_info = (struct tpm_info ) data;
	struct resource res;

	if (acpi_dev_resource_interrupt(ares, 0, &res))
	tpm_info->irq = res.start;
	else if (acpi_dev_resource_memory(ares, &res)) {
	tpm_info->res = res;
	tpm_info->res.name = NULL;
	}

	return 1;
	}

	static int tpm_tis_acpi_init(struct acpi_device *acpi_dev)
	{
	struct acpi_table_tpm2 *tbl;
	acpi_status st;
	struct list_head resources;
	struct tpm_info tpm_info = {};
	int ret;

	st = acpi_get_table(ACPI_SIG_TPM2, 1,
	(struct acpi_table_header **) &tbl);
	if (ACPI_FAILURE(st) \|\| tbl->header.length < sizeof(*tbl)) {
	dev_err(&acpi_dev->dev,
	FW_BUG "failed to get TPM2 ACPI table\n");
	return -EINVAL;
	}

	if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
	return -ENODEV;

	INIT_LIST_HEAD(&resources);
	tpm_info.irq = -1;
	ret = acpi_dev_get_resources(acpi_dev, &resources, tpm_check_resource,
	&tpm_info);
	if (ret < 0)
	return ret;

	acpi_dev_free_resource_list(&resources);

	if (resource_type(&tpm_info.res) != IORESOURCE_MEM) {
	dev_err(&acpi_dev->dev,
	FW_BUG "TPM2 ACPI table does not define a memory resource\n");
	return -EINVAL;
	}

	if (is_itpm(acpi_dev))
	itpm = true;

	return tpm_tis_init(&acpi_dev->dev, &tpm_info, acpi_dev->handle);
	}

	static int tpm_tis_acpi_remove(struct acpi_device *dev)
	{
	struct tpm_chip *chip = dev_get_drvdata(&dev->dev);

	tpm_chip_unregister(chip);
	tpm_tis_remove(chip);

	return 0;
	}

	static struct acpi_device_id tpm_acpi_tbl[] = {
	{"MSFT0101", 0}, /* TPM 2.0 */
	/* Add new here */
	{"", 0}, /* User Specified */
	{"", 0} /* Terminator */
	};
	MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl);

	static struct acpi_driver tis_acpi_driver = {
	.name = "tpm_tis",
	.ids = tpm_acpi_tbl,
	.ops = {
	.add = tpm_tis_acpi_init,
	.remove = tpm_tis_acpi_remove,
	},
	.drv = {
	.pm = &tpm_tis_pm,
	},
	};
	#endif

	static struct platform_device *force_pdev;

	static int tpm_tis_plat_probe(struct platform_device *pdev)
	{
	struct tpm_info tpm_info = {};
	struct resource *res;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
	dev_err(&pdev->dev, "no memory resource defined\n");
	return -ENODEV;
	}
	tpm_info.res = *res;

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (res) {
	tpm_info.irq = res->start;
	} else {
	if (pdev == force_pdev)
	tpm_info.irq = -1;
	else
	/* When forcing auto probe the IRQ */
	tpm_info.irq = 0;
	}

	return tpm_tis_init(&pdev->dev, &tpm_info, NULL);
	}

	static int tpm_tis_plat_remove(struct platform_device *pdev)
	{
	struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);

	tpm_chip_unregister(chip);
	tpm_tis_remove(chip);

	return 0;
	}

	static struct platform_driver tis_drv = {
	.probe = tpm_tis_plat_probe,
	.remove = tpm_tis_plat_remove,
	.driver = {
	.name = "tpm_tis",
	.pm = &tpm_tis_pm,
	},
	};

	static int tpm_tis_force_device(void)
	{
	struct platform_device *pdev;
	static const struct resource x86_resources[] = {
	{
	.start = 0xFED40000,
	.end = 0xFED40000 + TIS_MEM_LEN - 1,
	.flags = IORESOURCE_MEM,
	},
	};

	if (!force)
	return 0;

	/* The driver core will match the name tpm_tis of the device to
	* the tpm_tis platform driver and complete the setup via
	* tpm_tis_plat_probe
	*/
	pdev = platform_device_register_simple("tpm_tis", -1, x86_resources,
	ARRAY_SIZE(x86_resources));
	if (IS_ERR(pdev))
	return PTR_ERR(pdev);
	force_pdev = pdev;

	return 0;
	}

	static int __init init_tis(void)
	{
	int rc;

	rc = tpm_tis_force_device();
	if (rc)
	goto err_force;

	rc = platform_driver_register(&tis_drv);
	if (rc)
	goto err_platform;

	#ifdef CONFIG_ACPI
	rc = acpi_bus_register_driver(&tis_acpi_driver);
	if (rc)
	goto err_acpi;
	#endif

	if (IS_ENABLED(CONFIG_PNP)) {
	rc = pnp_register_driver(&tis_pnp_driver);
	if (rc)
	goto err_pnp;
	}

	return 0;

	err_pnp:
	#ifdef CONFIG_ACPI
	acpi_bus_unregister_driver(&tis_acpi_driver);
	err_acpi:
	#endif
	platform_device_unregister(force_pdev);
	err_platform:
	if (force_pdev)
	platform_device_unregister(force_pdev);
	err_force:
	return rc;
	}

	static void __exit cleanup_tis(void)
	{
	pnp_unregister_driver(&tis_pnp_driver);
	#ifdef CONFIG_ACPI
	acpi_bus_unregister_driver(&tis_acpi_driver);
	#endif
	platform_driver_unregister(&tis_drv);

	if (force_pdev)
	platform_device_unregister(force_pdev);
	}

	module_init(init_tis);
	module_exit(cleanup_tis);
	MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
	MODULE_DESCRIPTION("TPM Driver");
	MODULE_VERSION("2.0");
	MODULE_LICENSE("GPL");