tpm_tis: Consolidate the platform and acpi probe flow

Now that the platform device was merged for OF support we can use the
platform device to match ACPI devices as well and run everything
through tpm_tis_init.

pnp_acpi_device is replaced with ACPI_COMPANION, and ACPI_HANDLE is
pushed further down.

platform_get_resource is used instead of acpi_dev_get_resources.

The itpm global module parameter is no longer changed during itpm
detection, instead the phy specific bit is set directly.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jerry Snitselaar <jsnitsel@redhat.com> (with TPM 2.0)
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> (with TPM 1.2)
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

1 files changed, 54 insertions, 113 deletions

diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 1807b284326b..b14d4aa97af8 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -80,6 +80,8 @@ static int has_hid(struct acpi_device *dev, const char *hid)
 
 static inline int is_itpm(struct acpi_device *dev)
 {
+	if (!dev)
+		return 0;
 	return has_hid(dev, "INTC0102");
 }
 #else
@@ -89,6 +91,47 @@ static inline int is_itpm(struct acpi_device *dev)
 }
 #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)
 {
@@ -141,11 +184,15 @@ static const struct tpm_tis_phy_ops tpm_tcg = {
 	.write32 = tpm_tcg_write32,
 };
 
-static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
-			acpi_handle acpi_dev_handle)
+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)
@@ -158,11 +205,11 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
 	if (interrupts)
 		irq = tpm_info->irq;
 
-	if (itpm)
+	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_dev_handle);
+				 ACPI_HANDLE(dev));
 }
 
 static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
@@ -171,7 +218,6 @@ 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);
@@ -184,14 +230,7 @@ static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
 	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);
+	return tpm_tis_init(&pnp_dev->dev, &tpm_info);
 }
 
 static struct pnp_device_id tpm_pnp_tbl[] = {
@@ -231,93 +270,6 @@ 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)
@@ -341,7 +293,7 @@ static int tpm_tis_plat_probe(struct platform_device *pdev)
 			tpm_info.irq = 0;
 	}
 
-	return tpm_tis_init(&pdev->dev, &tpm_info, NULL);
+	return tpm_tis_init(&pdev->dev, &tpm_info);
 }
 
 static int tpm_tis_plat_remove(struct platform_device *pdev)
@@ -369,6 +321,7 @@ static struct platform_driver tis_drv = {
 		.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),
 	},
 };
 
@@ -411,11 +364,6 @@ static int __init init_tis(void)
 	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);
@@ -426,10 +374,6 @@ static int __init init_tis(void)
 	return 0;
 
 err_pnp:
-#ifdef CONFIG_ACPI
-	acpi_bus_unregister_driver(&tis_acpi_driver);
-err_acpi:
-#endif
 	platform_driver_unregister(&tis_drv);
 err_platform:
 	if (force_pdev)
@@ -441,9 +385,6 @@ err_force:
 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)