[linux-2.6-block.git] / drivers / char / tpm / tpm_tis.c

/*
 * 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 <linux/of.h>
#include <linux/of_device.h>
#include <linux/kernel.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)
{
	if (!dev)
		return 0;
	return has_hid(dev, "INTC0102");
}
#else
static inline int is_itpm(struct acpi_device *dev)
{
	return 0;
}
#endif

#if defined(CONFIG_ACPI)
#define DEVICE_IS_TPM2 1

static const struct acpi_device_id tpm_acpi_tbl[] = {
	{"MSFT0101", DEVICE_IS_TPM2},
	{},
};
MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl);

static int check_acpi_tpm2(struct device *dev)
{
	const struct acpi_device_id *aid = acpi_match_device(tpm_acpi_tbl, dev);
	struct acpi_table_tpm2 *tbl;
	acpi_status st;

	if (!aid || aid->driver_data != DEVICE_IS_TPM2)
		return 0;

	/* If the ACPI TPM2 signature is matched then a global ACPI_SIG_TPM2
	 * table is mandatory
	 */
	st =
	    acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **)&tbl);
	if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) {
		dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n");
		return -EINVAL;
	}

	/* The tpm2_crb driver handles this device */
	if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
		return -ENODEV;

	return 0;
}
#else
static int check_acpi_tpm2(struct 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,
			       const 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)
{
	struct tpm_tis_tcg_phy *phy;
	int irq = -1;
	int rc;

	rc = check_acpi_tpm2(dev);
	if (rc)
		return rc;

	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 || is_itpm(ACPI_COMPANION(dev)))
		phy->priv.flags |= TPM_TIS_ITPM_WORKAROUND;

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

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 = {};
	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;

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

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 (ARRAY_SIZE(tpm_pnp_tbl) - 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");

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;

	tpm_info.irq = platform_get_irq(pdev, 0);
	if (tpm_info.irq <= 0) {
		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);
}

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;
}

#ifdef CONFIG_OF
static const struct of_device_id tis_of_platform_match[] = {
	{.compatible = "tcg,tpm-tis-mmio"},
	{},
};
MODULE_DEVICE_TABLE(of, tis_of_platform_match);
#endif

static struct platform_driver tis_drv = {
	.probe = tpm_tis_plat_probe,
	.remove = tpm_tis_plat_remove,
	.driver = {
		.name		= "tpm_tis",
		.pm		= &tpm_tis_pm,
		.of_match_table = of_match_ptr(tis_of_platform_match),
		.acpi_match_table = ACPI_PTR(tpm_acpi_tbl),
	},
};

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;


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

	return 0;

err_pnp:
	platform_driver_unregister(&tis_drv);
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);
	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");
Commit	Line	Data
27084efe LD	1	/*
27084efe LD	2	* Copyright (C) 2005, 2006 IBM Corporation
399235dc	3	* Copyright (C) 2014, 2015 Intel Corporation
27084efe LD	4	*
	5	* Authors:
	6	* Leendert van Doorn <leendert@watson.ibm.com>
	7	* Kylene Hall <kjhall@us.ibm.com>
	8	*
8e81cc13 KY	9	* Maintained by: <tpmdd-devel@lists.sourceforge.net>
8e81cc13 KY	10	*
27084efe LD	11	* Device driver for TCG/TCPA TPM (trusted platform module).
	12	* Specifications at www.trustedcomputinggroup.org
	13	*
	14	* This device driver implements the TPM interface as defined in
	15	* the TCG TPM Interface Spec version 1.2, revision 1.0.
	16	*
	17	* This program is free software; you can redistribute it and/or
	18	* modify it under the terms of the GNU General Public License as
	19	* published by the Free Software Foundation, version 2 of the
	20	* License.
	21	*/
57135568 KJH	22	#include <linux/init.h>
	23	#include <linux/module.h>
	24	#include <linux/moduleparam.h>
27084efe	25	#include <linux/pnp.h>
5a0e3ad6	26	#include <linux/slab.h>
27084efe LD	27	#include <linux/interrupt.h>
27084efe LD	28	#include <linux/wait.h>
3f0d3d01	29	#include <linux/acpi.h>
20b87bbf	30	#include <linux/freezer.h>
420d4398 JG	31	#include <linux/of.h>
420d4398 JG	32	#include <linux/of_device.h>
33957a10	33	#include <linux/kernel.h>
27084efe	34	#include "tpm.h"
57dacc2b	35	#include "tpm_tis_core.h"
27084efe	36
399235dc	37	struct tpm_info {
51dd43df	38	struct resource res;
ef7b81dc JG	39	/* irq > 0 means: use irq $irq;
	40	* irq = 0 means: autoprobe for an irq;
	41	* irq = -1 means: no irq support
	42	*/
	43	int irq;
399235dc JS	44	};
399235dc JS	45
57dacc2b CR	46	struct tpm_tis_tcg_phy {
57dacc2b CR	47	struct tpm_tis_data priv;
4eea703c	48	void __iomem *iobase;
448e9c55 SD	49	};
448e9c55 SD	50
57dacc2b CR	51	static inline struct tpm_tis_tcg_phy to_tpm_tis_tcg_phy(struct tpm_tis_data data)
	52	{
	53	return container_of(data, struct tpm_tis_tcg_phy, priv);
	54	}
	55
41a5e1cf CR	56	static bool interrupts = true;
	57	module_param(interrupts, bool, 0444);
	58	MODULE_PARM_DESC(interrupts, "Enable interrupts");
	59
	60	static bool itpm;
	61	module_param(itpm, bool, 0444);
	62	MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
	63
	64	static bool force;
	65	#ifdef CONFIG_X86
	66	module_param(force, bool, 0444);
	67	MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
	68	#endif
	69
1560ffe6	70	#if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
399235dc	71	static int has_hid(struct acpi_device dev, const char hid)
3f0d3d01	72	{
3f0d3d01 MG	73	struct acpi_hardware_id *id;
3f0d3d01 MG	74
399235dc JS	75	list_for_each_entry(id, &dev->pnp.ids, list)
399235dc JS	76	if (!strcmp(hid, id->id))
3f0d3d01	77	return 1;
3f0d3d01 MG	78
	79	return 0;
	80	}
399235dc JS	81
	82	static inline int is_itpm(struct acpi_device *dev)
	83	{
4cb586a1 JG	84	if (!dev)
4cb586a1 JG	85	return 0;
399235dc JS	86	return has_hid(dev, "INTC0102");
399235dc JS	87	}
1560ffe6	88	#else
399235dc	89	static inline int is_itpm(struct acpi_device *dev)
1560ffe6 RD	90	{
	91	return 0;
	92	}
3f0d3d01 MG	93	#endif
3f0d3d01 MG	94
4cb586a1 JG	95	#if defined(CONFIG_ACPI)
	96	#define DEVICE_IS_TPM2 1
	97
	98	static const struct acpi_device_id tpm_acpi_tbl[] = {
	99	{"MSFT0101", DEVICE_IS_TPM2},
	100	{},
	101	};
	102	MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl);
	103
	104	static int check_acpi_tpm2(struct device *dev)
	105	{
	106	const struct acpi_device_id *aid = acpi_match_device(tpm_acpi_tbl, dev);
	107	struct acpi_table_tpm2 *tbl;
	108	acpi_status st;
	109
	110	if (!aid \|\| aid->driver_data != DEVICE_IS_TPM2)
	111	return 0;
	112
	113	/* If the ACPI TPM2 signature is matched then a global ACPI_SIG_TPM2
	114	* table is mandatory
	115	*/
	116	st =
	117	acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **)&tbl);
	118	if (ACPI_FAILURE(st) \|\| tbl->header.length < sizeof(*tbl)) {
	119	dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n");
	120	return -EINVAL;
	121	}
	122
	123	/* The tpm2_crb driver handles this device */
	124	if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
	125	return -ENODEV;
	126
	127	return 0;
	128	}
	129	#else
	130	static int check_acpi_tpm2(struct device *dev)
	131	{
	132	return 0;
	133	}
	134	#endif
	135
1107d065 CR	136	static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
	137	u8 *result)
	138	{
	139	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	140
	141	while (len--)
	142	*result++ = ioread8(phy->iobase + addr);
5e572cab	143
1107d065 CR	144	return 0;
	145	}
	146
	147	static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
c37fbc09	148	const u8 *value)
1107d065 CR	149	{
	150	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	151
	152	while (len--)
	153	iowrite8(*value++, phy->iobase + addr);
5e572cab	154
1107d065 CR	155	return 0;
	156	}
	157
	158	static int tpm_tcg_read16(struct tpm_tis_data data, u32 addr, u16 result)
	159	{
	160	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	161
	162	*result = ioread16(phy->iobase + addr);
5e572cab	163
1107d065 CR	164	return 0;
	165	}
	166
	167	static int tpm_tcg_read32(struct tpm_tis_data data, u32 addr, u32 result)
	168	{
	169	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	170
	171	*result = ioread32(phy->iobase + addr);
5e572cab	172
1107d065 CR	173	return 0;
	174	}
	175
	176	static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value)
	177	{
	178	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	179
	180	iowrite32(value, phy->iobase + addr);
5e572cab	181
1107d065 CR	182	return 0;
	183	}
	184
	185	static const struct tpm_tis_phy_ops tpm_tcg = {
	186	.read_bytes = tpm_tcg_read_bytes,
	187	.write_bytes = tpm_tcg_write_bytes,
	188	.read16 = tpm_tcg_read16,
	189	.read32 = tpm_tcg_read32,
	190	.write32 = tpm_tcg_write32,
	191	};
	192
4cb586a1	193	static int tpm_tis_init(struct device dev, struct tpm_info tpm_info)
27084efe	194	{
57dacc2b	195	struct tpm_tis_tcg_phy *phy;
41a5e1cf	196	int irq = -1;
4cb586a1 JG	197	int rc;
	198
	199	rc = check_acpi_tpm2(dev);
	200	if (rc)
	201	return rc;
27084efe	202
57dacc2b CR	203	phy = devm_kzalloc(dev, sizeof(struct tpm_tis_tcg_phy), GFP_KERNEL);
57dacc2b CR	204	if (phy == NULL)
448e9c55	205	return -ENOMEM;
afb5abc2	206
57dacc2b CR	207	phy->iobase = devm_ioremap_resource(dev, &tpm_info->res);
	208	if (IS_ERR(phy->iobase))
	209	return PTR_ERR(phy->iobase);
27084efe	210
41a5e1cf CR	211	if (interrupts)
41a5e1cf CR	212	irq = tpm_info->irq;
9519de3f	213
4cb586a1	214	if (itpm \|\| is_itpm(ACPI_COMPANION(dev)))
1d70fe9d	215	phy->priv.flags \|= TPM_TIS_ITPM_WORKAROUND;
25112048	216
41a5e1cf	217	return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg,
4cb586a1	218	ACPI_HANDLE(dev));
27084efe	219	}
96854310	220
a2fa3fb0 SK	221	static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
a2fa3fb0 SK	222
afc6d369	223	static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
ef7b81dc	224	const struct pnp_device_id *pnp_id)
9e323d3e	225	{
ef7b81dc	226	struct tpm_info tpm_info = {};
51dd43df	227	struct resource *res;
7917ff9a	228
51dd43df JG	229	res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0);
	230	if (!res)
	231	return -ENODEV;
	232	tpm_info.res = *res;
9e323d3e	233
7917ff9a	234	if (pnp_irq_valid(pnp_dev, 0))
399235dc	235	tpm_info.irq = pnp_irq(pnp_dev, 0);
7917ff9a	236	else
ef7b81dc	237	tpm_info.irq = -1;
7917ff9a	238
4cb586a1	239	return tpm_tis_init(&pnp_dev->dev, &tpm_info);
9e323d3e KJH	240	}
9e323d3e KJH	241
0bbed20e	242	static struct pnp_device_id tpm_pnp_tbl[] = {
27084efe	243	{"PNP0C31", 0}, /* TPM */
93e1b7d4 KJH	244	{"ATM1200", 0}, /* Atmel */
	245	{"IFX0102", 0}, /* Infineon */
	246	{"BCM0101", 0}, /* Broadcom */
061991ec	247	{"BCM0102", 0}, /* Broadcom */
93e1b7d4	248	{"NSC1200", 0}, /* National */
fb0e7e11	249	{"ICO0102", 0}, /* Intel */
93e1b7d4 KJH	250	/* Add new here */
	251	{"", 0}, /* User Specified */
	252	{"", 0} /* Terminator */
27084efe	253	};
31bde71c	254	MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);
27084efe	255
39af33fc	256	static void tpm_tis_pnp_remove(struct pnp_dev *dev)
253115b7 RA	257	{
253115b7 RA	258	struct tpm_chip *chip = pnp_get_drvdata(dev);
399235dc	259
afb5abc2 JS	260	tpm_chip_unregister(chip);
afb5abc2 JS	261	tpm_tis_remove(chip);
253115b7 RA	262	}
253115b7 RA	263
27084efe LD	264	static struct pnp_driver tis_pnp_driver = {
	265	.name = "tpm_tis",
	266	.id_table = tpm_pnp_tbl,
	267	.probe = tpm_tis_pnp_init,
253115b7	268	.remove = tpm_tis_pnp_remove,
a2fa3fb0 SK	269	.driver = {
	270	.pm = &tpm_tis_pm,
	271	},
27084efe LD	272	};
27084efe LD	273
33957a10	274	#define TIS_HID_USR_IDX (ARRAY_SIZE(tpm_pnp_tbl) - 2)
93e1b7d4 KJH	275	module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
	276	sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
	277	MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
7a192ec3	278
00194826 JG	279	static struct platform_device *force_pdev;
	280
	281	static int tpm_tis_plat_probe(struct platform_device *pdev)
	282	{
	283	struct tpm_info tpm_info = {};
	284	struct resource *res;
	285
	286	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	287	if (res == NULL) {
	288	dev_err(&pdev->dev, "no memory resource defined\n");
	289	return -ENODEV;
	290	}
	291	tpm_info.res = *res;
	292
fc0e1322 JG	293	tpm_info.irq = platform_get_irq(pdev, 0);
fc0e1322 JG	294	if (tpm_info.irq <= 0) {
d27f81f0	295	if (pdev != force_pdev)
00194826 JG	296	tpm_info.irq = -1;
	297	else
	298	/* When forcing auto probe the IRQ */
	299	tpm_info.irq = 0;
	300	}
	301
4cb586a1	302	return tpm_tis_init(&pdev->dev, &tpm_info);
00194826 JG	303	}
	304
	305	static int tpm_tis_plat_remove(struct platform_device *pdev)
	306	{
	307	struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
	308
	309	tpm_chip_unregister(chip);
	310	tpm_tis_remove(chip);
	311
	312	return 0;
	313	}
	314
420d4398 JG	315	#ifdef CONFIG_OF
	316	static const struct of_device_id tis_of_platform_match[] = {
	317	{.compatible = "tcg,tpm-tis-mmio"},
	318	{},
	319	};
	320	MODULE_DEVICE_TABLE(of, tis_of_platform_match);
	321	#endif
	322
7a192ec3	323	static struct platform_driver tis_drv = {
00194826 JG	324	.probe = tpm_tis_plat_probe,
00194826 JG	325	.remove = tpm_tis_plat_remove,
7a192ec3	326	.driver = {
afb5abc2	327	.name = "tpm_tis",
b633f050	328	.pm = &tpm_tis_pm,
420d4398	329	.of_match_table = of_match_ptr(tis_of_platform_match),
4cb586a1	330	.acpi_match_table = ACPI_PTR(tpm_acpi_tbl),
7a192ec3	331	},
9e323d3e KJH	332	};
9e323d3e KJH	333
00194826 JG	334	static int tpm_tis_force_device(void)
	335	{
	336	struct platform_device *pdev;
	337	static const struct resource x86_resources[] = {
	338	{
	339	.start = 0xFED40000,
	340	.end = 0xFED40000 + TIS_MEM_LEN - 1,
	341	.flags = IORESOURCE_MEM,
	342	},
	343	};
	344
	345	if (!force)
	346	return 0;
	347
	348	/* The driver core will match the name tpm_tis of the device to
	349	* the tpm_tis platform driver and complete the setup via
	350	* tpm_tis_plat_probe
	351	*/
	352	pdev = platform_device_register_simple("tpm_tis", -1, x86_resources,
	353	ARRAY_SIZE(x86_resources));
	354	if (IS_ERR(pdev))
	355	return PTR_ERR(pdev);
	356	force_pdev = pdev;
	357
	358	return 0;
	359	}
	360
27084efe LD	361	static int __init init_tis(void)
27084efe LD	362	{
9e323d3e	363	int rc;
00194826 JG	364
	365	rc = tpm_tis_force_device();
	366	if (rc)
	367	goto err_force;
	368
	369	rc = platform_driver_register(&tis_drv);
	370	if (rc)
	371	goto err_platform;
	372
9e323d3e	373
00194826 JG	374	if (IS_ENABLED(CONFIG_PNP)) {
	375	rc = pnp_register_driver(&tis_pnp_driver);
	376	if (rc)
	377	goto err_pnp;
9e323d3e	378	}
00194826	379
4fba3c3b	380	return 0;
00194826 JG	381
00194826 JG	382	err_pnp:
5939eaf4	383	platform_driver_unregister(&tis_drv);
00194826 JG	384	err_platform:
	385	if (force_pdev)
	386	platform_device_unregister(force_pdev);
	387	err_force:
7f2ab000	388	return rc;
27084efe LD	389	}
	390
	391	static void __exit cleanup_tis(void)
	392	{
00194826	393	pnp_unregister_driver(&tis_pnp_driver);
7f2ab000	394	platform_driver_unregister(&tis_drv);
00194826 JG	395
	396	if (force_pdev)
	397	platform_device_unregister(force_pdev);
27084efe LD	398	}
	399
	400	module_init(init_tis);
	401	module_exit(cleanup_tis);
	402	MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
	403	MODULE_DESCRIPTION("TPM Driver");
	404	MODULE_VERSION("2.0");
	405	MODULE_LICENSE("GPL");