Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

Pull security layer updates from James Morris:
 "Highlights:

   - Smack adds secmark support for Netfilter
   - /proc/keys is now mandatory if CONFIG_KEYS=y
   - TPM gets its own device class
   - Added TPM 2.0 support
   - Smack file hook rework (all Smack users should review this!)"

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (64 commits)
  cipso: don't use IPCB() to locate the CIPSO IP option
  SELinux: fix error code in policydb_init()
  selinux: add security in-core xattr support for pstore and debugfs
  selinux: quiet the filesystem labeling behavior message
  selinux: Remove unused function avc_sidcmp()
  ima: /proc/keys is now mandatory
  Smack: Repair netfilter dependency
  X.509: silence asn1 compiler debug output
  X.509: shut up about included cert for silent build
  KEYS: Make /proc/keys unconditional if CONFIG_KEYS=y
  MAINTAINERS: email update
  tpm/tpm_tis: Add missing ifdef CONFIG_ACPI for pnp_acpi_device
  smack: fix possible use after frees in task_security() callers
  smack: Add missing logging in bidirectional UDS connect check
  Smack: secmark support for netfilter
  Smack: Rework file hooks
  tpm: fix format string error in tpm-chip.c
  char/tpm/tpm_crb: fix build error
  smack: Fix a bidirectional UDS connect check typo
  smack: introduce a special case for tmpfs in smack_d_instantiate()
  ...

23 files changed, 2231 insertions, 937 deletions

diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index c54cac3f8bc8..9d4e37549eb2 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -100,15 +100,15 @@ config TCG_IBMVTPM
 	  will be accessible from within Linux.  To compile this driver
 	  as a module, choose M here; the module will be called tpm_ibmvtpm.
 
-config TCG_ST33_I2C
-	tristate "STMicroelectronics ST33 I2C TPM"
+config TCG_TIS_I2C_ST33
+	tristate "TPM Interface Specification 1.2 Interface (I2C - STMicroelectronics)"
 	depends on I2C
 	depends on GPIOLIB
 	---help---
 	  If you have a TPM security chip from STMicroelectronics working with
 	  an I2C bus say Yes and it will be accessible from within Linux.
 	  To compile this driver as a module, choose M here; the module will be
-	  called tpm_stm_st33_i2c.
+	  called tpm_i2c_stm_st33.
 
 config TCG_XEN
 	tristate "XEN TPM Interface"
@@ -122,4 +122,13 @@ config TCG_XEN
 	  To compile this driver as a module, choose M here; the module
 	  will be called xen-tpmfront.
 
+config TCG_CRB
+	tristate "TPM 2.0 CRB Interface"
+	depends on X86 && ACPI
+	---help---
+	  If you have a TPM security chip that is compliant with the
+	  TCG CRB 2.0 TPM specification say Yes and it will be accessible
+	  from within Linux.  To compile this driver as a module, choose
+	  M here; the module will be called tpm_crb.
+
 endif # TCG_TPM
diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index 4d85dd681b81..990cf183931d 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the kernel tpm device drivers.
 #
 obj-$(CONFIG_TCG_TPM) += tpm.o
-tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o
+tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o
 tpm-$(CONFIG_ACPI) += tpm_ppi.o
 
 ifdef CONFIG_ACPI
@@ -20,5 +20,6 @@ obj-$(CONFIG_TCG_NSC) += tpm_nsc.o
 obj-$(CONFIG_TCG_ATMEL) += tpm_atmel.o
 obj-$(CONFIG_TCG_INFINEON) += tpm_infineon.o
 obj-$(CONFIG_TCG_IBMVTPM) += tpm_ibmvtpm.o
-obj-$(CONFIG_TCG_ST33_I2C) += tpm_i2c_stm_st33.o
+obj-$(CONFIG_TCG_TIS_I2C_ST33) += tpm_i2c_stm_st33.o
 obj-$(CONFIG_TCG_XEN) += xen-tpmfront.o
+obj-$(CONFIG_TCG_CRB) += tpm_crb.o
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
new file mode 100644
index 000000000000..1d278ccd751f
--- /dev/null
+++ b/drivers/char/tpm/tpm-chip.c
@@ -0,0 +1,256 @@
+/*
+ * Copyright (C) 2004 IBM Corporation
+ * Copyright (C) 2014 Intel Corporation
+ *
+ * Authors:
+ * Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
+ * Leendert van Doorn <leendert@watson.ibm.com>
+ * Dave Safford <safford@watson.ibm.com>
+ * Reiner Sailer <sailer@watson.ibm.com>
+ * Kylene Hall <kjhall@us.ibm.com>
+ *
+ * Maintained by: <tpmdd-devel@lists.sourceforge.net>
+ *
+ * TPM chip management routines.
+ *
+ * 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/poll.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/freezer.h>
+#include <linux/major.h>
+#include "tpm.h"
+#include "tpm_eventlog.h"
+
+static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
+static LIST_HEAD(tpm_chip_list);
+static DEFINE_SPINLOCK(driver_lock);
+
+struct class *tpm_class;
+dev_t tpm_devt;
+
+/*
+ * tpm_chip_find_get - return tpm_chip for a given chip number
+ * @chip_num the device number for the chip
+ */
+struct tpm_chip *tpm_chip_find_get(int chip_num)
+{
+	struct tpm_chip *pos, *chip = NULL;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
+		if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
+			continue;
+
+		if (try_module_get(pos->pdev->driver->owner)) {
+			chip = pos;
+			break;
+		}
+	}
+	rcu_read_unlock();
+	return chip;
+}
+
+/**
+ * tpm_dev_release() - free chip memory and the device number
+ * @dev: the character device for the TPM chip
+ *
+ * This is used as the release function for the character device.
+ */
+static void tpm_dev_release(struct device *dev)
+{
+	struct tpm_chip *chip = container_of(dev, struct tpm_chip, dev);
+
+	spin_lock(&driver_lock);
+	clear_bit(chip->dev_num, dev_mask);
+	spin_unlock(&driver_lock);
+	kfree(chip);
+}
+
+/**
+ * tpmm_chip_alloc() - allocate a new struct tpm_chip instance
+ * @dev: device to which the chip is associated
+ * @ops: struct tpm_class_ops instance
+ *
+ * Allocates a new struct tpm_chip instance and assigns a free
+ * device number for it. Caller does not have to worry about
+ * freeing the allocated resources. When the devices is removed
+ * devres calls tpmm_chip_remove() to do the job.
+ */
+struct tpm_chip *tpmm_chip_alloc(struct device *dev,
+				 const struct tpm_class_ops *ops)
+{
+	struct tpm_chip *chip;
+
+	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+	if (chip == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	mutex_init(&chip->tpm_mutex);
+	INIT_LIST_HEAD(&chip->list);
+
+	chip->ops = ops;
+
+	spin_lock(&driver_lock);
+	chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
+	spin_unlock(&driver_lock);
+
+	if (chip->dev_num >= TPM_NUM_DEVICES) {
+		dev_err(dev, "No available tpm device numbers\n");
+		kfree(chip);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	set_bit(chip->dev_num, dev_mask);
+
+	scnprintf(chip->devname, sizeof(chip->devname), "tpm%d", chip->dev_num);
+
+	chip->pdev = dev;
+
+	dev_set_drvdata(dev, chip);
+
+	chip->dev.class = tpm_class;
+	chip->dev.release = tpm_dev_release;
+	chip->dev.parent = chip->pdev;
+
+	if (chip->dev_num == 0)
+		chip->dev.devt = MKDEV(MISC_MAJOR, TPM_MINOR);
+	else
+		chip->dev.devt = MKDEV(MAJOR(tpm_devt), chip->dev_num);
+
+	dev_set_name(&chip->dev, "%s", chip->devname);
+
+	device_initialize(&chip->dev);
+
+	chip->cdev.owner = chip->pdev->driver->owner;
+	cdev_init(&chip->cdev, &tpm_fops);
+
+	return chip;
+}
+EXPORT_SYMBOL_GPL(tpmm_chip_alloc);
+
+static int tpm_dev_add_device(struct tpm_chip *chip)
+{
+	int rc;
+
+	rc = device_add(&chip->dev);
+	if (rc) {
+		dev_err(&chip->dev,
+			"unable to device_register() %s, major %d, minor %d, err=%d\n",
+			chip->devname, MAJOR(chip->dev.devt),
+			MINOR(chip->dev.devt), rc);
+
+		return rc;
+	}
+
+	rc = cdev_add(&chip->cdev, chip->dev.devt, 1);
+	if (rc) {
+		dev_err(&chip->dev,
+			"unable to cdev_add() %s, major %d, minor %d, err=%d\n",
+			chip->devname, MAJOR(chip->dev.devt),
+			MINOR(chip->dev.devt), rc);
+
+		device_unregister(&chip->dev);
+		return rc;
+	}
+
+	return rc;
+}
+
+static void tpm_dev_del_device(struct tpm_chip *chip)
+{
+	cdev_del(&chip->cdev);
+	device_unregister(&chip->dev);
+}
+
+/*
+ * tpm_chip_register() - create a character device for the TPM chip
+ * @chip: TPM chip to use.
+ *
+ * Creates a character device for the TPM chip and adds sysfs interfaces for
+ * the device, PPI and TCPA. As the last step this function adds the
+ * chip to the list of TPM chips available for use.
+ *
+ * NOTE: This function should be only called after the chip initialization
+ * is complete.
+ *
+ * Called from tpm_<specific>.c probe function only for devices
+ * the driver has determined it should claim.  Prior to calling
+ * this function the specific probe function has called pci_enable_device
+ * upon errant exit from this function specific probe function should call
+ * pci_disable_device
+ */
+int tpm_chip_register(struct tpm_chip *chip)
+{
+	int rc;
+
+	rc = tpm_dev_add_device(chip);
+	if (rc)
+		return rc;
+
+	/* Populate sysfs for TPM1 devices. */
+	if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) {
+		rc = tpm_sysfs_add_device(chip);
+		if (rc)
+			goto del_misc;
+
+		rc = tpm_add_ppi(chip);
+		if (rc)
+			goto del_sysfs;
+
+		chip->bios_dir = tpm_bios_log_setup(chip->devname);
+	}
+
+	/* Make the chip available. */
+	spin_lock(&driver_lock);
+	list_add_rcu(&chip->list, &tpm_chip_list);
+	spin_unlock(&driver_lock);
+
+	chip->flags |= TPM_CHIP_FLAG_REGISTERED;
+
+	return 0;
+del_sysfs:
+	tpm_sysfs_del_device(chip);
+del_misc:
+	tpm_dev_del_device(chip);
+	return rc;
+}
+EXPORT_SYMBOL_GPL(tpm_chip_register);
+
+/*
+ * tpm_chip_unregister() - release the TPM driver
+ * @chip: TPM chip to use.
+ *
+ * Takes the chip first away from the list of available TPM chips and then
+ * cleans up all the resources reserved by tpm_chip_register().
+ *
+ * NOTE: This function should be only called before deinitializing chip
+ * resources.
+ */
+void tpm_chip_unregister(struct tpm_chip *chip)
+{
+	if (!(chip->flags & TPM_CHIP_FLAG_REGISTERED))
+		return;
+
+	spin_lock(&driver_lock);
+	list_del_rcu(&chip->list);
+	spin_unlock(&driver_lock);
+	synchronize_rcu();
+
+	if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) {
+		if (chip->bios_dir)
+			tpm_bios_log_teardown(chip->bios_dir);
+		tpm_remove_ppi(chip);
+		tpm_sysfs_del_device(chip);
+	}
+
+	tpm_dev_del_device(chip);
+}
+EXPORT_SYMBOL_GPL(tpm_chip_unregister);
diff --git a/drivers/char/tpm/tpm-dev.c b/drivers/char/tpm/tpm-dev.c
index d9b774e02a1f..de0337ebd658 100644
--- a/drivers/char/tpm/tpm-dev.c
+++ b/drivers/char/tpm/tpm-dev.c
@@ -17,7 +17,6 @@
  * License.
  *
  */
-#include <linux/miscdevice.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 #include "tpm.h"
@@ -54,16 +53,15 @@ static void timeout_work(struct work_struct *work)
 
 static int tpm_open(struct inode *inode, struct file *file)
 {
-	struct miscdevice *misc = file->private_data;
-	struct tpm_chip *chip = container_of(misc, struct tpm_chip,
-					     vendor.miscdev);
+	struct tpm_chip *chip =
+		container_of(inode->i_cdev, struct tpm_chip, cdev);
 	struct file_priv *priv;
 
 	/* It's assured that the chip will be opened just once,
 	 * by the check of is_open variable, which is protected
 	 * by driver_lock. */
 	if (test_and_set_bit(0, &chip->is_open)) {
-		dev_dbg(chip->dev, "Another process owns this TPM\n");
+		dev_dbg(chip->pdev, "Another process owns this TPM\n");
 		return -EBUSY;
 	}
 
@@ -81,7 +79,7 @@ static int tpm_open(struct inode *inode, struct file *file)
 	INIT_WORK(&priv->work, timeout_work);
 
 	file->private_data = priv;
-	get_device(chip->dev);
+	get_device(chip->pdev);
 	return 0;
 }
 
@@ -168,12 +166,12 @@ static int tpm_release(struct inode *inode, struct file *file)
 	file->private_data = NULL;
 	atomic_set(&priv->data_pending, 0);
 	clear_bit(0, &priv->chip->is_open);
-	put_device(priv->chip->dev);
+	put_device(priv->chip->pdev);
 	kfree(priv);
 	return 0;
 }
 
-static const struct file_operations tpm_fops = {
+const struct file_operations tpm_fops = {
 	.owner = THIS_MODULE,
 	.llseek = no_llseek,
 	.open = tpm_open,
@@ -182,32 +180,4 @@ static const struct file_operations tpm_fops = {
 	.release = tpm_release,
 };
 
-int tpm_dev_add_device(struct tpm_chip *chip)
-{
-	int rc;
 
-	chip->vendor.miscdev.fops = &tpm_fops;
-	if (chip->dev_num == 0)
-		chip->vendor.miscdev.minor = TPM_MINOR;
-	else
-		chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
-
-	chip->vendor.miscdev.name = chip->devname;
-	chip->vendor.miscdev.parent = chip->dev;
-
-	rc = misc_register(&chip->vendor.miscdev);
-	if (rc) {
-		chip->vendor.miscdev.name = NULL;
-		dev_err(chip->dev,
-			"unable to misc_register %s, minor %d err=%d\n",
-			chip->vendor.miscdev.name,
-			chip->vendor.miscdev.minor, rc);
-	}
-	return rc;
-}
-
-void tpm_dev_del_device(struct tpm_chip *chip)
-{
-	if (chip->vendor.miscdev.name)
-		misc_deregister(&chip->vendor.miscdev);
-}
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 6af17002a115..bf53a3771da5 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2004 IBM Corporation
+ * Copyright (C) 2014 Intel Corporation
  *
  * Authors:
  * Leendert van Doorn <leendert@watson.ibm.com>
@@ -47,10 +48,6 @@ module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
 MODULE_PARM_DESC(suspend_pcr,
 		 "PCR to use for dummy writes to faciltate flush on suspend.");
 
-static LIST_HEAD(tpm_chip_list);
-static DEFINE_SPINLOCK(driver_lock);
-static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
-
 /*
  * Array with one entry per ordinal defining the maximum amount
  * of time the chip could take to return the result.  The ordinal
@@ -346,7 +343,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 	if (count == 0)
 		return -ENODATA;
 	if (count > bufsiz) {
-		dev_err(chip->dev,
+		dev_err(chip->pdev,
 			"invalid count value %x %zx\n", count, bufsiz);
 		return -E2BIG;
 	}
@@ -355,7 +352,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 
 	rc = chip->ops->send(chip, (u8 *) buf, count);
 	if (rc < 0) {
-		dev_err(chip->dev,
+		dev_err(chip->pdev,
 			"tpm_transmit: tpm_send: error %zd\n", rc);
 		goto out;
 	}
@@ -363,7 +360,10 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 	if (chip->vendor.irq)
 		goto out_recv;
 
-	stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
+	if (chip->flags & TPM_CHIP_FLAG_TPM2)
+		stop = jiffies + tpm2_calc_ordinal_duration(chip, ordinal);
+	else
+		stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
 	do {
 		u8 status = chip->ops->status(chip);
 		if ((status & chip->ops->req_complete_mask) ==
@@ -371,7 +371,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 			goto out_recv;
 
 		if (chip->ops->req_canceled(chip, status)) {
-			dev_err(chip->dev, "Operation Canceled\n");
+			dev_err(chip->pdev, "Operation Canceled\n");
 			rc = -ECANCELED;
 			goto out;
 		}
@@ -381,14 +381,14 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 	} while (time_before(jiffies, stop));
 
 	chip->ops->cancel(chip);
-	dev_err(chip->dev, "Operation Timed out\n");
+	dev_err(chip->pdev, "Operation Timed out\n");
 	rc = -ETIME;
 	goto out;
 
 out_recv:
 	rc = chip->ops->recv(chip, (u8 *) buf, bufsiz);
 	if (rc < 0)
-		dev_err(chip->dev,
+		dev_err(chip->pdev,
 			"tpm_transmit: tpm_recv: error %zd\n", rc);
 out:
 	mutex_unlock(&chip->tpm_mutex);
@@ -398,9 +398,10 @@ out:
 #define TPM_DIGEST_SIZE 20
 #define TPM_RET_CODE_IDX 6
 
-static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
-			    int len, const char *desc)
+ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd,
+			 int len, const char *desc)
 {
+	struct tpm_output_header *header;
 	int err;
 
 	len = tpm_transmit(chip, (u8 *) cmd, len);
@@ -409,9 +410,12 @@ static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
 	else if (len < TPM_HEADER_SIZE)
 		return -EFAULT;
 
-	err = be32_to_cpu(cmd->header.out.return_code);
+	header = cmd;
+
+	err = be32_to_cpu(header->return_code);
 	if (err != 0 && desc)
-		dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
+		dev_err(chip->pdev, "A TPM error (%d) occurred %s\n", err,
+			desc);
 
 	return err;
 }
@@ -448,7 +452,7 @@ ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
 		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 		tpm_cmd.params.getcap_in.subcap = subcap_id;
 	}
-	rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
+	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
 	if (!rc)
 		*cap = tpm_cmd.params.getcap_out.cap;
 	return rc;
@@ -464,8 +468,8 @@ void tpm_gen_interrupt(struct tpm_chip *chip)
 	tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 	tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
 
-	rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
-			"attempting to determine the timeouts");
+	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
+			      "attempting to determine the timeouts");
 }
 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
 
@@ -483,9 +487,10 @@ static int tpm_startup(struct tpm_chip *chip, __be16 startup_type)
 {
 	struct tpm_cmd_t start_cmd;
 	start_cmd.header.in = tpm_startup_header;
+
 	start_cmd.params.startup_in.startup_type = startup_type;
-	return transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE,
-			    "attempting to start the TPM");
+	return tpm_transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE,
+				"attempting to start the TPM");
 }
 
 int tpm_get_timeouts(struct tpm_chip *chip)
@@ -500,12 +505,12 @@ int tpm_get_timeouts(struct tpm_chip *chip)
 	tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
 	tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 	tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
-	rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, NULL);
+	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, NULL);
 
 	if (rc == TPM_ERR_INVALID_POSTINIT) {
 		/* The TPM is not started, we are the first to talk to it.
 		   Execute a startup command. */
-		dev_info(chip->dev, "Issuing TPM_STARTUP");
+		dev_info(chip->pdev, "Issuing TPM_STARTUP");
 		if (tpm_startup(chip, TPM_ST_CLEAR))
 			return rc;
 
@@ -513,11 +518,11 @@ int tpm_get_timeouts(struct tpm_chip *chip)
 		tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
 		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 		tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
-		rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
+		rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
 				  NULL);
 	}
 	if (rc) {
-		dev_err(chip->dev,
+		dev_err(chip->pdev,
 			"A TPM error (%zd) occurred attempting to determine the timeouts\n",
 			rc);
 		goto duration;
@@ -556,7 +561,7 @@ int tpm_get_timeouts(struct tpm_chip *chip)
 
 	/* Report adjusted timeouts */
 	if (chip->vendor.timeout_adjusted) {
-		dev_info(chip->dev,
+		dev_info(chip->pdev,
 			 HW_ERR "Adjusting reported timeouts: A %lu->%luus B %lu->%luus C %lu->%luus D %lu->%luus\n",
 			 old_timeout[0], new_timeout[0],
 			 old_timeout[1], new_timeout[1],
@@ -575,8 +580,8 @@ duration:
 	tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
 	tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
 
-	rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
-			"attempting to determine the durations");
+	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
+			      "attempting to determine the durations");
 	if (rc)
 		return rc;
 
@@ -603,7 +608,7 @@ duration:
 		chip->vendor.duration[TPM_MEDIUM] *= 1000;
 		chip->vendor.duration[TPM_LONG] *= 1000;
 		chip->vendor.duration_adjusted = true;
-		dev_info(chip->dev, "Adjusting TPM timeout parameters.");
+		dev_info(chip->pdev, "Adjusting TPM timeout parameters.");
 	}
 	return 0;
 }
@@ -631,32 +636,11 @@ static int tpm_continue_selftest(struct tpm_chip *chip)
 	struct tpm_cmd_t cmd;
 
 	cmd.header.in = continue_selftest_header;
-	rc = transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
-			  "continue selftest");
+	rc = tpm_transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
+			      "continue selftest");
 	return rc;
 }
 
-/*
- * tpm_chip_find_get - return tpm_chip for given chip number
- */
-static struct tpm_chip *tpm_chip_find_get(int chip_num)
-{
-	struct tpm_chip *pos, *chip = NULL;
-
-	rcu_read_lock();
-	list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
-		if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
-			continue;
-
-		if (try_module_get(pos->dev->driver->owner)) {
-			chip = pos;
-			break;
-		}
-	}
-	rcu_read_unlock();
-	return chip;
-}
-
 #define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
 #define READ_PCR_RESULT_SIZE 30
 static struct tpm_input_header pcrread_header = {
@@ -672,8 +656,8 @@ int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
 
 	cmd.header.in = pcrread_header;
 	cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
-	rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
-			  "attempting to read a pcr value");
+	rc = tpm_transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
+			      "attempting to read a pcr value");
 
 	if (rc == 0)
 		memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
@@ -700,7 +684,10 @@ int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
 	chip = tpm_chip_find_get(chip_num);
 	if (chip == NULL)
 		return -ENODEV;
-	rc = tpm_pcr_read_dev(chip, pcr_idx, res_buf);
+	if (chip->flags & TPM_CHIP_FLAG_TPM2)
+		rc = tpm2_pcr_read(chip, pcr_idx, res_buf);
+	else
+		rc = tpm_pcr_read_dev(chip, pcr_idx, res_buf);
 	tpm_chip_put(chip);
 	return rc;
 }
@@ -734,11 +721,17 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
 	if (chip == NULL)
 		return -ENODEV;
 
+	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
+		rc = tpm2_pcr_extend(chip, pcr_idx, hash);
+		tpm_chip_put(chip);
+		return rc;
+	}
+
 	cmd.header.in = pcrextend_header;
 	cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
 	memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
-	rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
-			  "attempting extend a PCR value");
+	rc = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
+			      "attempting extend a PCR value");
 
 	tpm_chip_put(chip);
 	return rc;
@@ -781,7 +774,7 @@ int tpm_do_selftest(struct tpm_chip *chip)
 		 * around 300ms while the self test is ongoing, keep trying
 		 * until the self test duration expires. */
 		if (rc == -ETIME) {
-			dev_info(chip->dev, HW_ERR "TPM command timed out during continue self test");
+			dev_info(chip->pdev, HW_ERR "TPM command timed out during continue self test");
 			msleep(delay_msec);
 			continue;
 		}
@@ -791,7 +784,7 @@ int tpm_do_selftest(struct tpm_chip *chip)
 
 		rc = be32_to_cpu(cmd.header.out.return_code);
 		if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
-			dev_info(chip->dev,
+			dev_info(chip->pdev,
 				 "TPM is disabled/deactivated (0x%X)\n", rc);
 			/* TPM is disabled and/or deactivated; driver can
 			 * proceed and TPM does handle commands for
@@ -817,7 +810,7 @@ int tpm_send(u32 chip_num, void *cmd, size_t buflen)
 	if (chip == NULL)
 		return -ENODEV;
 
-	rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
+	rc = tpm_transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
 
 	tpm_chip_put(chip);
 	return rc;
@@ -884,30 +877,6 @@ again:
 }
 EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
 
-void tpm_remove_hardware(struct device *dev)
-{
-	struct tpm_chip *chip = dev_get_drvdata(dev);
-
-	if (chip == NULL) {
-		dev_err(dev, "No device data found\n");
-		return;
-	}
-
-	spin_lock(&driver_lock);
-	list_del_rcu(&chip->list);
-	spin_unlock(&driver_lock);
-	synchronize_rcu();
-
-	tpm_dev_del_device(chip);
-	tpm_sysfs_del_device(chip);
-	tpm_remove_ppi(&dev->kobj);
-	tpm_bios_log_teardown(chip->bios_dir);
-
-	/* write it this way to be explicit (chip->dev == dev) */
-	put_device(chip->dev);
-}
-EXPORT_SYMBOL_GPL(tpm_remove_hardware);
-
 #define TPM_ORD_SAVESTATE cpu_to_be32(152)
 #define SAVESTATE_RESULT_SIZE 10
 
@@ -932,20 +901,23 @@ int tpm_pm_suspend(struct device *dev)
 	if (chip == NULL)
 		return -ENODEV;
 
+	if (chip->flags & TPM_CHIP_FLAG_TPM2)
+		return tpm2_shutdown(chip, TPM2_SU_CLEAR);
+
 	/* for buggy tpm, flush pcrs with extend to selected dummy */
 	if (tpm_suspend_pcr) {
 		cmd.header.in = pcrextend_header;
 		cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
 		memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
 		       TPM_DIGEST_SIZE);
-		rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
-				  "extending dummy pcr before suspend");
+		rc = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
+				      "extending dummy pcr before suspend");
 	}
 
 	/* now do the actual savestate */
 	for (try = 0; try < TPM_RETRY; try++) {
 		cmd.header.in = savestate_header;
-		rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, NULL);
+		rc = tpm_transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, NULL);
 
 		/*
 		 * If the TPM indicates that it is too busy to respond to
@@ -963,10 +935,10 @@ int tpm_pm_suspend(struct device *dev)
 	}
 
 	if (rc)
-		dev_err(chip->dev,
+		dev_err(chip->pdev,
 			"Error (%d) sending savestate before suspend\n", rc);
 	else if (try > 0)
-		dev_warn(chip->dev, "TPM savestate took %dms\n",
+		dev_warn(chip->pdev, "TPM savestate took %dms\n",
 			 try * TPM_TIMEOUT_RETRY);
 
 	return rc;
@@ -1018,11 +990,17 @@ int tpm_get_random(u32 chip_num, u8 *out, size_t max)
 	if (chip == NULL)
 		return -ENODEV;
 
+	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
+		err = tpm2_get_random(chip, out, max);
+		tpm_chip_put(chip);
+		return err;
+	}
+
 	do {
 		tpm_cmd.header.in = tpm_getrandom_header;
 		tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
 
-		err = transmit_cmd(chip, &tpm_cmd,
+		err = tpm_transmit_cmd(chip, &tpm_cmd,
 				   TPM_GETRANDOM_RESULT_SIZE + num_bytes,
 				   "attempting get random");
 		if (err)
@@ -1041,103 +1019,34 @@ int tpm_get_random(u32 chip_num, u8 *out, size_t max)
 }
 EXPORT_SYMBOL_GPL(tpm_get_random);
 
-/* In case vendor provided release function, call it too.*/
-
-void tpm_dev_vendor_release(struct tpm_chip *chip)
+static int __init tpm_init(void)
 {
-	if (!chip)
-		return;
-
-	clear_bit(chip->dev_num, dev_mask);
-}
-EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
-
-
-/*
- * Once all references to platform device are down to 0,
- * release all allocated structures.
- */
-static void tpm_dev_release(struct device *dev)
-{
-	struct tpm_chip *chip = dev_get_drvdata(dev);
+	int rc;
 
-	if (!chip)
-		return;
+	tpm_class = class_create(THIS_MODULE, "tpm");
+	if (IS_ERR(tpm_class)) {
+		pr_err("couldn't create tpm class\n");
+		return PTR_ERR(tpm_class);
+	}
 
-	tpm_dev_vendor_release(chip);
+	rc = alloc_chrdev_region(&tpm_devt, 0, TPM_NUM_DEVICES, "tpm");
+	if (rc < 0) {
+		pr_err("tpm: failed to allocate char dev region\n");
+		class_destroy(tpm_class);
+		return rc;
+	}
 
-	chip->release(dev);
-	kfree(chip);
+	return 0;
 }
 
-/*
- * Called from tpm_<specific>.c probe function only for devices
- * the driver has determined it should claim.  Prior to calling
- * this function the specific probe function has called pci_enable_device
- * upon errant exit from this function specific probe function should call
- * pci_disable_device
- */
-struct tpm_chip *tpm_register_hardware(struct device *dev,
-				       const struct tpm_class_ops *ops)
+static void __exit tpm_exit(void)
 {
-	struct tpm_chip *chip;
-
-	/* Driver specific per-device data */
-	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
-
-	if (chip == NULL)
-		return NULL;
-
-	mutex_init(&chip->tpm_mutex);
-	INIT_LIST_HEAD(&chip->list);
-
-	chip->ops = ops;
-	chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
-
-	if (chip->dev_num >= TPM_NUM_DEVICES) {
-		dev_err(dev, "No available tpm device numbers\n");
-		goto out_free;
-	}
-
-	set_bit(chip->dev_num, dev_mask);
-
-	scnprintf(chip->devname, sizeof(chip->devname), "%s%d", "tpm",
-		  chip->dev_num);
-
-	chip->dev = get_device(dev);
-	chip->release = dev->release;
-	dev->release = tpm_dev_release;
-	dev_set_drvdata(dev, chip);
-
-	if (tpm_dev_add_device(chip))
-		goto put_device;
-
-	if (tpm_sysfs_add_device(chip))
-		goto del_misc;
-
-	if (tpm_add_ppi(&dev->kobj))
-		goto del_sysfs;
-
-	chip->bios_dir = tpm_bios_log_setup(chip->devname);
-
-	/* Make chip available */
-	spin_lock(&driver_lock);
-	list_add_rcu(&chip->list, &tpm_chip_list);
-	spin_unlock(&driver_lock);
-
-	return chip;
-
-del_sysfs:
-	tpm_sysfs_del_device(chip);
-del_misc:
-	tpm_dev_del_device(chip);
-put_device:
-	put_device(chip->dev);
-out_free:
-	kfree(chip);
-	return NULL;
+	class_destroy(tpm_class);
+	unregister_chrdev_region(tpm_devt, TPM_NUM_DEVICES);
 }
-EXPORT_SYMBOL_GPL(tpm_register_hardware);
+
+subsys_initcall(tpm_init);
+module_exit(tpm_exit);
 
 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
 MODULE_DESCRIPTION("TPM Driver");
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index 01730a27ae07..ee66fd4673f3 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -20,25 +20,6 @@
 #include <linux/device.h>
 #include "tpm.h"
 
-/* XXX for now this helper is duplicated in tpm-interface.c */
-static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
-			    int len, const char *desc)
-{
-	int err;
-
-	len = tpm_transmit(chip, (u8 *) cmd, len);
-	if (len <  0)
-		return len;
-	else if (len < TPM_HEADER_SIZE)
-		return -EFAULT;
-
-	err = be32_to_cpu(cmd->header.out.return_code);
-	if (err != 0 && desc)
-		dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
-
-	return err;
-}
-
 #define READ_PUBEK_RESULT_SIZE 314
 #define TPM_ORD_READPUBEK cpu_to_be32(124)
 static struct tpm_input_header tpm_readpubek_header = {
@@ -58,8 +39,8 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
 	struct tpm_chip *chip = dev_get_drvdata(dev);
 
 	tpm_cmd.header.in = tpm_readpubek_header;
-	err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
-			   "attempting to read the PUBEK");
+	err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
+			       "attempting to read the PUBEK");
 	if (err)
 		goto out;
 
@@ -303,16 +284,16 @@ static const struct attribute_group tpm_dev_group = {
 int tpm_sysfs_add_device(struct tpm_chip *chip)
 {
 	int err;
-	err = sysfs_create_group(&chip->dev->kobj,
+	err = sysfs_create_group(&chip->pdev->kobj,
 				 &tpm_dev_group);
 
 	if (err)
-		dev_err(chip->dev,
+		dev_err(chip->pdev,
 			"failed to create sysfs attributes, %d\n", err);
 	return err;
 }
 
 void tpm_sysfs_del_device(struct tpm_chip *chip)
 {
-	sysfs_remove_group(&chip->dev->kobj, &tpm_dev_group);
+	sysfs_remove_group(&chip->pdev->kobj, &tpm_dev_group);
 }
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index e4d0888d2eab..7b0727c5e803 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -10,23 +10,24 @@
  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
  *
  * Device driver for TCG/TCPA TPM (trusted platform module).
- * Specifications at www.trustedcomputinggroup.org	 
+ * Specifications at www.trustedcomputinggroup.org
  *
  * 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/module.h>
 #include <linux/delay.h>
 #include <linux/fs.h>
 #include <linux/mutex.h>
 #include <linux/sched.h>
-#include <linux/miscdevice.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/tpm.h>
+#include <linux/acpi.h>
+#include <linux/cdev.h>
 
 enum tpm_const {
 	TPM_MINOR = 224,	/* officially assigned */
@@ -61,6 +62,59 @@ enum tpm_duration {
 #define TPM_ERR_INVALID_POSTINIT 38
 
 #define TPM_HEADER_SIZE		10
+
+enum tpm2_const {
+	TPM2_PLATFORM_PCR	= 24,
+	TPM2_PCR_SELECT_MIN	= ((TPM2_PLATFORM_PCR + 7) / 8),
+	TPM2_TIMEOUT_A		= 750,
+	TPM2_TIMEOUT_B		= 2000,
+	TPM2_TIMEOUT_C		= 200,
+	TPM2_TIMEOUT_D		= 30,
+	TPM2_DURATION_SHORT	= 20,
+	TPM2_DURATION_MEDIUM	= 750,
+	TPM2_DURATION_LONG	= 2000,
+};
+
+enum tpm2_structures {
+	TPM2_ST_NO_SESSIONS	= 0x8001,
+	TPM2_ST_SESSIONS	= 0x8002,
+};
+
+enum tpm2_return_codes {
+	TPM2_RC_INITIALIZE	= 0x0100,
+	TPM2_RC_TESTING		= 0x090A,
+	TPM2_RC_DISABLED	= 0x0120,
+};
+
+enum tpm2_algorithms {
+	TPM2_ALG_SHA1		= 0x0004,
+};
+
+enum tpm2_command_codes {
+	TPM2_CC_FIRST		= 0x011F,
+	TPM2_CC_SELF_TEST	= 0x0143,
+	TPM2_CC_STARTUP		= 0x0144,
+	TPM2_CC_SHUTDOWN	= 0x0145,
+	TPM2_CC_GET_CAPABILITY	= 0x017A,
+	TPM2_CC_GET_RANDOM	= 0x017B,
+	TPM2_CC_PCR_READ	= 0x017E,
+	TPM2_CC_PCR_EXTEND	= 0x0182,
+	TPM2_CC_LAST		= 0x018F,
+};
+
+enum tpm2_permanent_handles {
+	TPM2_RS_PW		= 0x40000009,
+};
+
+enum tpm2_capabilities {
+	TPM2_CAP_TPM_PROPERTIES = 6,
+};
+
+enum tpm2_startup_types {
+	TPM2_SU_CLEAR	= 0x0000,
+	TPM2_SU_STATE	= 0x0001,
+};
+
 struct tpm_chip;
 
 struct tpm_vendor_specific {
@@ -73,7 +127,6 @@ struct tpm_vendor_specific {
 	int region_size;
 	int have_region;
 
-	struct miscdevice miscdev;
 	struct list_head list;
 	int locality;
 	unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
@@ -88,15 +141,27 @@ struct tpm_vendor_specific {
 	u16 manufacturer_id;
 };
 
-#define TPM_VPRIV(c)	(c)->vendor.priv
+#define TPM_VPRIV(c)     ((c)->vendor.priv)
 
 #define TPM_VID_INTEL    0x8086
 #define TPM_VID_WINBOND  0x1050
 #define TPM_VID_STM      0x104A
 
+#define TPM_PPI_VERSION_LEN		3
+
+enum tpm_chip_flags {
+	TPM_CHIP_FLAG_REGISTERED	= BIT(0),
+	TPM_CHIP_FLAG_PPI		= BIT(1),
+	TPM_CHIP_FLAG_TPM2		= BIT(2),
+};
+
 struct tpm_chip {
-	struct device *dev;	/* Device stuff */
+	struct device *pdev;	/* Device stuff */
+	struct device dev;
+	struct cdev cdev;
+
 	const struct tpm_class_ops *ops;
+	unsigned int flags;
 
 	int dev_num;		/* /dev/tpm# */
 	char devname[7];
@@ -109,15 +174,19 @@ struct tpm_chip {
 
 	struct dentry **bios_dir;
 
+#ifdef CONFIG_ACPI
+	acpi_handle acpi_dev_handle;
+	char ppi_version[TPM_PPI_VERSION_LEN + 1];
+#endif /* CONFIG_ACPI */
+
 	struct list_head list;
-	void (*release) (struct device *);
 };
 
 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
 
 static inline void tpm_chip_put(struct tpm_chip *chip)
 {
-	module_put(chip->dev->driver->owner);
+	module_put(chip->pdev->driver->owner);
 }
 
 static inline int tpm_read_index(int base, int index)
@@ -313,40 +382,57 @@ struct tpm_cmd_t {
 	tpm_cmd_params	params;
 } __packed;
 
-ssize_t	tpm_getcap(struct device *, __be32, cap_t *, const char *);
+extern struct class *tpm_class;
+extern dev_t tpm_devt;
+extern const struct file_operations tpm_fops;
 
+ssize_t	tpm_getcap(struct device *, __be32, cap_t *, const char *);
 ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 		     size_t bufsiz);
+ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd, int len,
+			 const char *desc);
 extern int tpm_get_timeouts(struct tpm_chip *);
 extern void tpm_gen_interrupt(struct tpm_chip *);
 extern int tpm_do_selftest(struct tpm_chip *);
 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
-extern struct tpm_chip* tpm_register_hardware(struct device *,
-					      const struct tpm_class_ops *ops);
-extern void tpm_dev_vendor_release(struct tpm_chip *);
-extern void tpm_remove_hardware(struct device *);
 extern int tpm_pm_suspend(struct device *);
 extern int tpm_pm_resume(struct device *);
 extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
 			     wait_queue_head_t *, bool);
 
-int tpm_dev_add_device(struct tpm_chip *chip);
-void tpm_dev_del_device(struct tpm_chip *chip);
+struct tpm_chip *tpm_chip_find_get(int chip_num);
+extern struct tpm_chip *tpmm_chip_alloc(struct device *dev,
+				       const struct tpm_class_ops *ops);
+extern int tpm_chip_register(struct tpm_chip *chip);
+extern void tpm_chip_unregister(struct tpm_chip *chip);
+
 int tpm_sysfs_add_device(struct tpm_chip *chip);
 void tpm_sysfs_del_device(struct tpm_chip *chip);
 
 int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
 
 #ifdef CONFIG_ACPI
-extern int tpm_add_ppi(struct kobject *);
-extern void tpm_remove_ppi(struct kobject *);
+extern int tpm_add_ppi(struct tpm_chip *chip);
+extern void tpm_remove_ppi(struct tpm_chip *chip);
 #else
-static inline int tpm_add_ppi(struct kobject *parent)
+static inline int tpm_add_ppi(struct tpm_chip *chip)
 {
 	return 0;
 }
 
-static inline void tpm_remove_ppi(struct kobject *parent)
+static inline void tpm_remove_ppi(struct tpm_chip *chip)
 {
 }
 #endif
+
+int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
+int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
+int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
+ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
+			u32 *value, const char *desc);
+
+extern int tpm2_startup(struct tpm_chip *chip, u16 startup_type);
+extern int tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
+extern unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *, u32);
+extern int tpm2_do_selftest(struct tpm_chip *chip);
+extern int tpm2_gen_interrupt(struct tpm_chip *chip, bool quiet);
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
new file mode 100644
index 000000000000..1abe6502219f
--- /dev/null
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -0,0 +1,617 @@
+/*
+ * Copyright (C) 2014 Intel Corporation
+ *
+ * Authors:
+ * Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
+ *
+ * Maintained by: <tpmdd-devel@lists.sourceforge.net>
+ *
+ * This file contains TPM2 protocol implementations of the commands
+ * used by the kernel internally.
+ *
+ * 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 "tpm.h"
+
+struct tpm2_startup_in {
+	__be16	startup_type;
+} __packed;
+
+struct tpm2_self_test_in {
+	u8	full_test;
+} __packed;
+
+struct tpm2_pcr_read_in {
+	__be32	pcr_selects_cnt;
+	__be16	hash_alg;
+	u8	pcr_select_size;
+	u8	pcr_select[TPM2_PCR_SELECT_MIN];
+} __packed;
+
+struct tpm2_pcr_read_out {
+	__be32	update_cnt;
+	__be32	pcr_selects_cnt;
+	__be16	hash_alg;
+	u8	pcr_select_size;
+	u8	pcr_select[TPM2_PCR_SELECT_MIN];
+	__be32	digests_cnt;
+	__be16	digest_size;
+	u8	digest[TPM_DIGEST_SIZE];
+} __packed;
+
+struct tpm2_null_auth_area {
+	__be32			handle;
+	__be16			nonce_size;
+	u8			attributes;
+	__be16			auth_size;
+} __packed;
+
+struct tpm2_pcr_extend_in {
+	__be32				pcr_idx;
+	__be32				auth_area_size;
+	struct tpm2_null_auth_area	auth_area;
+	__be32				digest_cnt;
+	__be16				hash_alg;
+	u8				digest[TPM_DIGEST_SIZE];
+} __packed;
+
+struct tpm2_get_tpm_pt_in {
+	__be32	cap_id;
+	__be32	property_id;
+	__be32	property_cnt;
+} __packed;
+
+struct tpm2_get_tpm_pt_out {
+	u8	more_data;
+	__be32	subcap_id;
+	__be32	property_cnt;
+	__be32	property_id;
+	__be32	value;
+} __packed;
+
+struct tpm2_get_random_in {
+	__be16	size;
+} __packed;
+
+struct tpm2_get_random_out {
+	__be16	size;
+	u8	buffer[TPM_MAX_RNG_DATA];
+} __packed;
+
+union tpm2_cmd_params {
+	struct	tpm2_startup_in		startup_in;
+	struct	tpm2_self_test_in	selftest_in;
+	struct	tpm2_pcr_read_in	pcrread_in;
+	struct	tpm2_pcr_read_out	pcrread_out;
+	struct	tpm2_pcr_extend_in	pcrextend_in;
+	struct	tpm2_get_tpm_pt_in	get_tpm_pt_in;
+	struct	tpm2_get_tpm_pt_out	get_tpm_pt_out;
+	struct	tpm2_get_random_in	getrandom_in;
+	struct	tpm2_get_random_out	getrandom_out;
+};
+
+struct tpm2_cmd {
+	tpm_cmd_header		header;
+	union tpm2_cmd_params	params;
+} __packed;
+
+/*
+ * Array with one entry per ordinal defining the maximum amount
+ * of time the chip could take to return the result. The values
+ * of the SHORT, MEDIUM, and LONG durations are taken from the
+ * PC Client Profile (PTP) specification.
+ */
+static const u8 tpm2_ordinal_duration[TPM2_CC_LAST - TPM2_CC_FIRST + 1] = {
+	TPM_UNDEFINED,		/* 11F */
+	TPM_UNDEFINED,		/* 120 */
+	TPM_LONG,		/* 121 */
+	TPM_UNDEFINED,		/* 122 */
+	TPM_UNDEFINED,		/* 123 */
+	TPM_UNDEFINED,		/* 124 */
+	TPM_UNDEFINED,		/* 125 */
+	TPM_UNDEFINED,		/* 126 */
+	TPM_UNDEFINED,		/* 127 */
+	TPM_UNDEFINED,		/* 128 */
+	TPM_LONG,		/* 129 */
+	TPM_UNDEFINED,		/* 12a */
+	TPM_UNDEFINED,		/* 12b */
+	TPM_UNDEFINED,		/* 12c */
+	TPM_UNDEFINED,		/* 12d */
+	TPM_UNDEFINED,		/* 12e */
+	TPM_UNDEFINED,		/* 12f */
+	TPM_UNDEFINED,		/* 130 */
+	TPM_UNDEFINED,		/* 131 */
+	TPM_UNDEFINED,		/* 132 */
+	TPM_UNDEFINED,		/* 133 */
+	TPM_UNDEFINED,		/* 134 */
+	TPM_UNDEFINED,		/* 135 */
+	TPM_UNDEFINED,		/* 136 */
+	TPM_UNDEFINED,		/* 137 */
+	TPM_UNDEFINED,		/* 138 */
+	TPM_UNDEFINED,		/* 139 */
+	TPM_UNDEFINED,		/* 13a */
+	TPM_UNDEFINED,		/* 13b */
+	TPM_UNDEFINED,		/* 13c */
+	TPM_UNDEFINED,		/* 13d */
+	TPM_MEDIUM,		/* 13e */
+	TPM_UNDEFINED,		/* 13f */
+	TPM_UNDEFINED,		/* 140 */
+	TPM_UNDEFINED,		/* 141 */
+	TPM_UNDEFINED,		/* 142 */
+	TPM_LONG,		/* 143 */
+	TPM_MEDIUM,		/* 144 */
+	TPM_UNDEFINED,		/* 145 */
+	TPM_UNDEFINED,		/* 146 */
+	TPM_UNDEFINED,		/* 147 */
+	TPM_UNDEFINED,		/* 148 */
+	TPM_UNDEFINED,		/* 149 */
+	TPM_UNDEFINED,		/* 14a */
+	TPM_UNDEFINED,		/* 14b */
+	TPM_UNDEFINED,		/* 14c */
+	TPM_UNDEFINED,		/* 14d */
+	TPM_LONG,		/* 14e */
+	TPM_UNDEFINED,		/* 14f */
+	TPM_UNDEFINED,		/* 150 */
+	TPM_UNDEFINED,		/* 151 */
+	TPM_UNDEFINED,		/* 152 */
+	TPM_UNDEFINED,		/* 153 */
+	TPM_UNDEFINED,		/* 154 */
+	TPM_UNDEFINED,		/* 155 */
+	TPM_UNDEFINED,		/* 156 */
+	TPM_UNDEFINED,		/* 157 */
+	TPM_UNDEFINED,		/* 158 */
+	TPM_UNDEFINED,		/* 159 */
+	TPM_UNDEFINED,		/* 15a */
+	TPM_UNDEFINED,		/* 15b */
+	TPM_MEDIUM,		/* 15c */
+	TPM_UNDEFINED,		/* 15d */
+	TPM_UNDEFINED,		/* 15e */
+	TPM_UNDEFINED,		/* 15f */
+	TPM_UNDEFINED,		/* 160 */
+	TPM_UNDEFINED,		/* 161 */
+	TPM_UNDEFINED,		/* 162 */
+	TPM_UNDEFINED,		/* 163 */
+	TPM_UNDEFINED,		/* 164 */
+	TPM_UNDEFINED,		/* 165 */
+	TPM_UNDEFINED,		/* 166 */
+	TPM_UNDEFINED,		/* 167 */
+	TPM_UNDEFINED,		/* 168 */
+	TPM_UNDEFINED,		/* 169 */
+	TPM_UNDEFINED,		/* 16a */
+	TPM_UNDEFINED,		/* 16b */
+	TPM_UNDEFINED,		/* 16c */
+	TPM_UNDEFINED,		/* 16d */
+	TPM_UNDEFINED,		/* 16e */
+	TPM_UNDEFINED,		/* 16f */
+	TPM_UNDEFINED,		/* 170 */
+	TPM_UNDEFINED,		/* 171 */
+	TPM_UNDEFINED,		/* 172 */
+	TPM_UNDEFINED,		/* 173 */
+	TPM_UNDEFINED,		/* 174 */
+	TPM_UNDEFINED,		/* 175 */
+	TPM_UNDEFINED,		/* 176 */
+	TPM_LONG,		/* 177 */
+	TPM_UNDEFINED,		/* 178 */
+	TPM_UNDEFINED,		/* 179 */
+	TPM_MEDIUM,		/* 17a */
+	TPM_LONG,		/* 17b */
+	TPM_UNDEFINED,		/* 17c */
+	TPM_UNDEFINED,		/* 17d */
+	TPM_UNDEFINED,		/* 17e */
+	TPM_UNDEFINED,		/* 17f */
+	TPM_UNDEFINED,		/* 180 */
+	TPM_UNDEFINED,		/* 181 */
+	TPM_MEDIUM,		/* 182 */
+	TPM_UNDEFINED,		/* 183 */
+	TPM_UNDEFINED,		/* 184 */
+	TPM_MEDIUM,		/* 185 */
+	TPM_MEDIUM,		/* 186 */
+	TPM_UNDEFINED,		/* 187 */
+	TPM_UNDEFINED,		/* 188 */
+	TPM_UNDEFINED,		/* 189 */
+	TPM_UNDEFINED,		/* 18a */
+	TPM_UNDEFINED,		/* 18b */
+	TPM_UNDEFINED,		/* 18c */
+	TPM_UNDEFINED,		/* 18d */
+	TPM_UNDEFINED,		/* 18e */
+	TPM_UNDEFINED		/* 18f */
+};
+
+#define TPM2_PCR_READ_IN_SIZE \
+	(sizeof(struct tpm_input_header) + \
+	 sizeof(struct tpm2_pcr_read_in))
+
+static const struct tpm_input_header tpm2_pcrread_header = {
+	.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
+	.length = cpu_to_be32(TPM2_PCR_READ_IN_SIZE),
+	.ordinal = cpu_to_be32(TPM2_CC_PCR_READ)
+};
+
+/**
+ * tpm2_pcr_read() - read a PCR value
+ * @chip:	TPM chip to use.
+ * @pcr_idx:	index of the PCR to read.
+ * @ref_buf:	buffer to store the resulting hash,
+ *
+ * 0 is returned when the operation is successful. If a negative number is
+ * returned it remarks a POSIX error code. If a positive number is returned
+ * it remarks a TPM error.
+ */
+int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
+{
+	int rc;
+	struct tpm2_cmd cmd;
+	u8 *buf;
+
+	if (pcr_idx >= TPM2_PLATFORM_PCR)
+		return -EINVAL;
+
+	cmd.header.in = tpm2_pcrread_header;
+	cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1);
+	cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
+	cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN;
+
+	memset(cmd.params.pcrread_in.pcr_select, 0,
+	       sizeof(cmd.params.pcrread_in.pcr_select));
+	cmd.params.pcrread_in.pcr_select[pcr_idx >> 3] = 1 << (pcr_idx & 0x7);
+
+	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
+			      "attempting to read a pcr value");
+	if (rc == 0) {
+		buf = cmd.params.pcrread_out.digest;
+		memcpy(res_buf, buf, TPM_DIGEST_SIZE);
+	}
+
+	return rc;
+}
+
+#define TPM2_GET_PCREXTEND_IN_SIZE \
+	(sizeof(struct tpm_input_header) + \
+	 sizeof(struct tpm2_pcr_extend_in))
+
+static const struct tpm_input_header tpm2_pcrextend_header = {
+	.tag = cpu_to_be16(TPM2_ST_SESSIONS),
+	.length = cpu_to_be32(TPM2_GET_PCREXTEND_IN_SIZE),
+	.ordinal = cpu_to_be32(TPM2_CC_PCR_EXTEND)
+};
+
+/**
+ * tpm2_pcr_extend() - extend a PCR value
+ * @chip:	TPM chip to use.
+ * @pcr_idx:	index of the PCR.
+ * @hash:	hash value to use for the extend operation.
+ *
+ * 0 is returned when the operation is successful. If a negative number is
+ * returned it remarks a POSIX error code. If a positive number is returned
+ * it remarks a TPM error.
+ */
+int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
+{
+	struct tpm2_cmd cmd;
+	int rc;
+
+	cmd.header.in = tpm2_pcrextend_header;
+	cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
+	cmd.params.pcrextend_in.auth_area_size =
+		cpu_to_be32(sizeof(struct tpm2_null_auth_area));
+	cmd.params.pcrextend_in.auth_area.handle =
+		cpu_to_be32(TPM2_RS_PW);
+	cmd.params.pcrextend_in.auth_area.nonce_size = 0;
+	cmd.params.pcrextend_in.auth_area.attributes = 0;
+	cmd.params.pcrextend_in.auth_area.auth_size = 0;
+	cmd.params.pcrextend_in.digest_cnt = cpu_to_be32(1);
+	cmd.params.pcrextend_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
+	memcpy(cmd.params.pcrextend_in.digest, hash, TPM_DIGEST_SIZE);
+
+	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
+			      "attempting extend a PCR value");
+
+	return rc;
+}
+
+#define TPM2_GETRANDOM_IN_SIZE \
+	(sizeof(struct tpm_input_header) + \
+	 sizeof(struct tpm2_get_random_in))
+
+static const struct tpm_input_header tpm2_getrandom_header = {
+	.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
+	.length = cpu_to_be32(TPM2_GETRANDOM_IN_SIZE),
+	.ordinal = cpu_to_be32(TPM2_CC_GET_RANDOM)
+};
+
+/**
+ * tpm2_get_random() - get random bytes from the TPM RNG
+ * @chip: TPM chip to use
+ * @out: destination buffer for the random bytes
+ * @max: the max number of bytes to write to @out
+ *
+ * 0 is returned when the operation is successful. If a negative number is
+ * returned it remarks a POSIX error code. If a positive number is returned
+ * it remarks a TPM error.
+ */
+int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max)
+{
+	struct tpm2_cmd cmd;
+	u32 recd;
+	u32 num_bytes;
+	int err;
+	int total = 0;
+	int retries = 5;
+	u8 *dest = out;
+
+	num_bytes = min_t(u32, max, sizeof(cmd.params.getrandom_out.buffer));
+
+	if (!out || !num_bytes ||
+	    max > sizeof(cmd.params.getrandom_out.buffer))
+		return -EINVAL;
+
+	do {
+		cmd.header.in = tpm2_getrandom_header;
+		cmd.params.getrandom_in.size = cpu_to_be16(num_bytes);
+
+		err = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
+				       "attempting get random");
+		if (err)
+			break;
+
+		recd = min_t(u32, be16_to_cpu(cmd.params.getrandom_out.size),
+			     num_bytes);
+		memcpy(dest, cmd.params.getrandom_out.buffer, recd);
+
+		dest += recd;
+		total += recd;
+		num_bytes -= recd;
+	} while (retries-- && total < max);
+
+	return total ? total : -EIO;
+}
+
+#define TPM2_GET_TPM_PT_IN_SIZE \
+	(sizeof(struct tpm_input_header) + \
+	 sizeof(struct tpm2_get_tpm_pt_in))
+
+static const struct tpm_input_header tpm2_get_tpm_pt_header = {
+	.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
+	.length = cpu_to_be32(TPM2_GET_TPM_PT_IN_SIZE),
+	.ordinal = cpu_to_be32(TPM2_CC_GET_CAPABILITY)
+};
+
+/**
+ * tpm2_get_tpm_pt() - get value of a TPM_CAP_TPM_PROPERTIES type property
+ * @chip:		TPM chip to use.
+ * @property_id:	property ID.
+ * @value:		output variable.
+ * @desc:		passed to tpm_transmit_cmd()
+ *
+ * 0 is returned when the operation is successful. If a negative number is
+ * returned it remarks a POSIX error code. If a positive number is returned
+ * it remarks a TPM error.
+ */
+ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,  u32 *value,
+			const char *desc)
+{
+	struct tpm2_cmd cmd;
+	int rc;
+
+	cmd.header.in = tpm2_get_tpm_pt_header;
+	cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES);
+	cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(property_id);
+	cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
+
+	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), desc);
+	if (!rc)
+		*value = cmd.params.get_tpm_pt_out.value;
+
+	return rc;
+}
+
+#define TPM2_STARTUP_IN_SIZE \
+	(sizeof(struct tpm_input_header) + \
+	 sizeof(struct tpm2_startup_in))
+
+static const struct tpm_input_header tpm2_startup_header = {
+	.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
+	.length = cpu_to_be32(TPM2_STARTUP_IN_SIZE),
+	.ordinal = cpu_to_be32(TPM2_CC_STARTUP)
+};
+
+/**
+ * tpm2_startup() - send startup command to the TPM chip
+ * @chip:		TPM chip to use.
+ * @startup_type	startup type. The value is either
+ *			TPM_SU_CLEAR or TPM_SU_STATE.
+ *
+ * 0 is returned when the operation is successful. If a negative number is
+ * returned it remarks a POSIX error code. If a positive number is returned
+ * it remarks a TPM error.
+ */
+int tpm2_startup(struct tpm_chip *chip, u16 startup_type)
+{
+	struct tpm2_cmd cmd;
+
+	cmd.header.in = tpm2_startup_header;
+
+	cmd.params.startup_in.startup_type = cpu_to_be16(startup_type);
+	return tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
+				"attempting to start the TPM");
+}
+EXPORT_SYMBOL_GPL(tpm2_startup);
+
+#define TPM2_SHUTDOWN_IN_SIZE \
+	(sizeof(struct tpm_input_header) + \
+	 sizeof(struct tpm2_startup_in))
+
+static const struct tpm_input_header tpm2_shutdown_header = {
+	.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
+	.length = cpu_to_be32(TPM2_SHUTDOWN_IN_SIZE),
+	.ordinal = cpu_to_be32(TPM2_CC_SHUTDOWN)
+};
+
+/**
+ * tpm2_shutdown() - send shutdown command to the TPM chip
+ * @chip:		TPM chip to use.
+ * @shutdown_type	shutdown type. The value is either
+ *			TPM_SU_CLEAR or TPM_SU_STATE.
+ *
+ * 0 is returned when the operation is successful. If a negative number is
+ * returned it remarks a POSIX error code. If a positive number is returned
+ * it remarks a TPM error.
+ */
+int tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
+{
+	struct tpm2_cmd cmd;
+
+	cmd.header.in = tpm2_shutdown_header;
+
+	cmd.params.startup_in.startup_type = cpu_to_be16(shutdown_type);
+	return tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
+				"stopping the TPM");
+}
+EXPORT_SYMBOL_GPL(tpm2_shutdown);
+
+/*
+ * tpm2_calc_ordinal_duration() - maximum duration for a command
+ * @chip:	TPM chip to use.
+ * @ordinal:	command code number.
+ *
+ * 0 is returned when the operation is successful. If a negative number is
+ * returned it remarks a POSIX error code. If a positive number is returned
+ * it remarks a TPM error.
+ */
+unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
+{
+	int index = TPM_UNDEFINED;
+	int duration = 0;
+
+	if (ordinal >= TPM2_CC_FIRST && ordinal <= TPM2_CC_LAST)
+		index = tpm2_ordinal_duration[ordinal - TPM2_CC_FIRST];
+
+	if (index != TPM_UNDEFINED)
+		duration = chip->vendor.duration[index];
+
+	if (duration <= 0)
+		duration = 2 * 60 * HZ;
+
+	return duration;
+}
+EXPORT_SYMBOL_GPL(tpm2_calc_ordinal_duration);
+
+#define TPM2_SELF_TEST_IN_SIZE \
+	(sizeof(struct tpm_input_header) + \
+	 sizeof(struct tpm2_self_test_in))
+
+static const struct tpm_input_header tpm2_selftest_header = {
+	.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
+	.length = cpu_to_be32(TPM2_SELF_TEST_IN_SIZE),
+	.ordinal = cpu_to_be32(TPM2_CC_SELF_TEST)
+};
+
+/**
+ * tpm2_continue_selftest() - start a self test
+ * @chip: TPM chip to use
+ * @full: test all commands instead of testing only those that were not
+ *        previously tested.
+ *
+ * 0 is returned when the operation is successful. If a negative number is
+ * returned it remarks a POSIX error code. If a positive number is returned
+ * it remarks a TPM error.
+ */
+static int tpm2_start_selftest(struct tpm_chip *chip, bool full)
+{
+	int rc;
+	struct tpm2_cmd cmd;
+
+	cmd.header.in = tpm2_selftest_header;
+	cmd.params.selftest_in.full_test = full;
+
+	rc = tpm_transmit_cmd(chip, &cmd, TPM2_SELF_TEST_IN_SIZE,
+			      "continue selftest");
+
+	/* At least some prototype chips seem to give RC_TESTING error
+	 * immediately. This is a workaround for that.
+	 */
+	if (rc == TPM2_RC_TESTING) {
+		dev_warn(chip->pdev, "Got RC_TESTING, ignoring\n");
+		rc = 0;
+	}
+
+	return rc;
+}
+
+/**
+ * tpm2_do_selftest() - run a full self test
+ * @chip: TPM chip to use
+ *
+ * During the self test TPM2 commands return with the error code RC_TESTING.
+ * Waiting is done by issuing PCR read until it executes successfully.
+ *
+ * 0 is returned when the operation is successful. If a negative number is
+ * returned it remarks a POSIX error code. If a positive number is returned
+ * it remarks a TPM error.
+ */
+int tpm2_do_selftest(struct tpm_chip *chip)
+{
+	int rc;
+	unsigned int loops;
+	unsigned int delay_msec = 100;
+	unsigned long duration;
+	struct tpm2_cmd cmd;
+	int i;
+
+	duration = tpm2_calc_ordinal_duration(chip, TPM2_CC_SELF_TEST);
+
+	loops = jiffies_to_msecs(duration) / delay_msec;
+
+	rc = tpm2_start_selftest(chip, true);
+	if (rc)
+		return rc;
+
+	for (i = 0; i < loops; i++) {
+		/* Attempt to read a PCR value */
+		cmd.header.in = tpm2_pcrread_header;
+		cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1);
+		cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
+		cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN;
+		cmd.params.pcrread_in.pcr_select[0] = 0x01;
+		cmd.params.pcrread_in.pcr_select[1] = 0x00;
+		cmd.params.pcrread_in.pcr_select[2] = 0x00;
+
+		rc = tpm_transmit_cmd(chip, (u8 *) &cmd, sizeof(cmd), NULL);
+		if (rc < 0)
+			break;
+
+		rc = be32_to_cpu(cmd.header.out.return_code);
+		if (rc != TPM2_RC_TESTING)
+			break;
+
+		msleep(delay_msec);
+	}
+
+	return rc;
+}
+EXPORT_SYMBOL_GPL(tpm2_do_selftest);
+
+/**
+ * tpm2_gen_interrupt() - generate an interrupt
+ * @chip: TPM chip to use
+ * @quiet: surpress the error message
+ *
+ * 0 is returned when the operation is successful. If a negative number is
+ * returned it remarks a POSIX error code. If a positive number is returned
+ * it remarks a TPM error.
+ */
+int tpm2_gen_interrupt(struct tpm_chip *chip, bool quiet)
+{
+	const char *desc = NULL;
+	u32 dummy;
+
+	if (!quiet)
+		desc = "attempting to generate an interrupt";
+
+	return tpm2_get_tpm_pt(chip, TPM2_CAP_TPM_PROPERTIES, &dummy, desc);
+}
+EXPORT_SYMBOL_GPL(tpm2_gen_interrupt);
diff --git a/drivers/char/tpm/tpm_atmel.c b/drivers/char/tpm/tpm_atmel.c
index 435c8b9dd2f8..dfadad0916a1 100644
--- a/drivers/char/tpm/tpm_atmel.c
+++ b/drivers/char/tpm/tpm_atmel.c
@@ -49,7 +49,7 @@ static int tpm_atml_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 	for (i = 0; i < 6; i++) {
 		status = ioread8(chip->vendor.iobase + 1);
 		if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
-			dev_err(chip->dev, "error reading header\n");
+			dev_err(chip->pdev, "error reading header\n");
 			return -EIO;
 		}
 		*buf++ = ioread8(chip->vendor.iobase);
@@ -60,12 +60,12 @@ static int tpm_atml_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 	size = be32_to_cpu(*native_size);
 
 	if (count < size) {
-		dev_err(chip->dev,
+		dev_err(chip->pdev,
 			"Recv size(%d) less than available space\n", size);
 		for (; i < size; i++) {	/* clear the waiting data anyway */
 			status = ioread8(chip->vendor.iobase + 1);
 			if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
-				dev_err(chip->dev, "error reading data\n");
+				dev_err(chip->pdev, "error reading data\n");
 				return -EIO;
 			}
 		}
@@ -76,7 +76,7 @@ static int tpm_atml_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 	for (; i < size; i++) {
 		status = ioread8(chip->vendor.iobase + 1);
 		if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
-			dev_err(chip->dev, "error reading data\n");
+			dev_err(chip->pdev, "error reading data\n");
 			return -EIO;
 		}
 		*buf++ = ioread8(chip->vendor.iobase);
@@ -86,7 +86,7 @@ static int tpm_atml_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 	status = ioread8(chip->vendor.iobase + 1);
 
 	if (status & ATML_STATUS_DATA_AVAIL) {
-		dev_err(chip->dev, "data available is stuck\n");
+		dev_err(chip->pdev, "data available is stuck\n");
 		return -EIO;
 	}
 
@@ -97,9 +97,9 @@ static int tpm_atml_send(struct tpm_chip *chip, u8 *buf, size_t count)
 {
 	int i;
 
-	dev_dbg(chip->dev, "tpm_atml_send:\n");
+	dev_dbg(chip->pdev, "tpm_atml_send:\n");
 	for (i = 0; i < count; i++) {
-		dev_dbg(chip->dev, "%d 0x%x(%d)\n",  i, buf[i], buf[i]);
+		dev_dbg(chip->pdev, "%d 0x%x(%d)\n",  i, buf[i], buf[i]);
  		iowrite8(buf[i], chip->vendor.iobase);
 	}
 
@@ -138,11 +138,11 @@ static void atml_plat_remove(void)
 	struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
 
 	if (chip) {
+		tpm_chip_unregister(chip);
 		if (chip->vendor.have_region)
 			atmel_release_region(chip->vendor.base,
 					     chip->vendor.region_size);
 		atmel_put_base_addr(chip->vendor.iobase);
-		tpm_remove_hardware(chip->dev);
 		platform_device_unregister(pdev);
 	}
 }
@@ -183,8 +183,9 @@ static int __init init_atmel(void)
 		goto err_rel_reg;
 	}
 
-	if (!(chip = tpm_register_hardware(&pdev->dev, &tpm_atmel))) {
-		rc = -ENODEV;
+	chip = tpmm_chip_alloc(&pdev->dev, &tpm_atmel);
+	if (IS_ERR(chip)) {
+		rc = PTR_ERR(chip);
 		goto err_unreg_dev;
 	}
 
@@ -193,6 +194,10 @@ static int __init init_atmel(void)
 	chip->vendor.have_region = have_region;
 	chip->vendor.region_size = region_size;
 
+	rc = tpm_chip_register(chip);
+	if (rc)
+		goto err_unreg_dev;
+
 	return 0;
 
 err_unreg_dev:
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
new file mode 100644
index 000000000000..3dd23cfae4fe
--- /dev/null
+++ b/drivers/char/tpm/tpm_crb.c
@@ -0,0 +1,354 @@
+/*
+ * Copyright (C) 2014 Intel Corporation
+ *
+ * Authors:
+ * Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
+ *
+ * Maintained by: <tpmdd-devel@lists.sourceforge.net>
+ *
+ * This device driver implements the TPM interface as defined in
+ * the TCG CRB 2.0 TPM specification.
+ *
+ * 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/acpi.h>
+#include <linux/highmem.h>
+#include <linux/rculist.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include "tpm.h"
+
+#define ACPI_SIG_TPM2 "TPM2"
+
+static const u8 CRB_ACPI_START_UUID[] = {
+	/* 0000 */ 0xAB, 0x6C, 0xBF, 0x6B, 0x63, 0x54, 0x14, 0x47,
+	/* 0008 */ 0xB7, 0xCD, 0xF0, 0x20, 0x3C, 0x03, 0x68, 0xD4
+};
+
+enum crb_defaults {
+	CRB_ACPI_START_REVISION_ID = 1,
+	CRB_ACPI_START_INDEX = 1,
+};
+
+enum crb_start_method {
+	CRB_SM_ACPI_START = 2,
+	CRB_SM_CRB = 7,
+	CRB_SM_CRB_WITH_ACPI_START = 8,
+};
+
+struct acpi_tpm2 {
+	struct acpi_table_header hdr;
+	u16 platform_class;
+	u16 reserved;
+	u64 control_area_pa;
+	u32 start_method;
+} __packed;
+
+enum crb_ca_request {
+	CRB_CA_REQ_GO_IDLE	= BIT(0),
+	CRB_CA_REQ_CMD_READY	= BIT(1),
+};
+
+enum crb_ca_status {
+	CRB_CA_STS_ERROR	= BIT(0),
+	CRB_CA_STS_TPM_IDLE	= BIT(1),
+};
+
+enum crb_start {
+	CRB_START_INVOKE	= BIT(0),
+};
+
+enum crb_cancel {
+	CRB_CANCEL_INVOKE	= BIT(0),
+};
+
+struct crb_control_area {
+	u32 req;
+	u32 sts;
+	u32 cancel;
+	u32 start;
+	u32 int_enable;
+	u32 int_sts;
+	u32 cmd_size;
+	u64 cmd_pa;
+	u32 rsp_size;
+	u64 rsp_pa;
+} __packed;
+
+enum crb_status {
+	CRB_STS_COMPLETE	= BIT(0),
+};
+
+enum crb_flags {
+	CRB_FL_ACPI_START	= BIT(0),
+	CRB_FL_CRB_START	= BIT(1),
+};
+
+struct crb_priv {
+	unsigned int flags;
+	struct crb_control_area __iomem *cca;
+	u8 __iomem *cmd;
+	u8 __iomem *rsp;
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int crb_resume(struct device *dev)
+{
+	int rc;
+	struct tpm_chip *chip = dev_get_drvdata(dev);
+
+	rc = tpm2_shutdown(chip, TPM2_SU_STATE);
+	if (!rc)
+		rc = tpm2_do_selftest(chip);
+
+	return rc;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(crb_pm, tpm_pm_suspend, crb_resume);
+
+static u8 crb_status(struct tpm_chip *chip)
+{
+	struct crb_priv *priv = chip->vendor.priv;
+	u8 sts = 0;
+
+	if ((le32_to_cpu(ioread32(&priv->cca->start)) & CRB_START_INVOKE) !=
+	    CRB_START_INVOKE)
+		sts |= CRB_STS_COMPLETE;
+
+	return sts;
+}
+
+static int crb_recv(struct tpm_chip *chip, u8 *buf, size_t count)
+{
+	struct crb_priv *priv = chip->vendor.priv;
+	unsigned int expected;
+
+	/* sanity check */
+	if (count < 6)
+		return -EIO;
+
+	if (le32_to_cpu(ioread32(&priv->cca->sts)) & CRB_CA_STS_ERROR)
+		return -EIO;
+
+	memcpy_fromio(buf, priv->rsp, 6);
+	expected = be32_to_cpup((__be32 *) &buf[2]);
+
+	if (expected > count)
+		return -EIO;
+
+	memcpy_fromio(&buf[6], &priv->rsp[6], expected - 6);
+
+	return expected;
+}
+
+static int crb_do_acpi_start(struct tpm_chip *chip)
+{
+	union acpi_object *obj;
+	int rc;
+
+	obj = acpi_evaluate_dsm(chip->acpi_dev_handle,
+				CRB_ACPI_START_UUID,
+				CRB_ACPI_START_REVISION_ID,
+				CRB_ACPI_START_INDEX,
+				NULL);
+	if (!obj)
+		return -ENXIO;
+	rc = obj->integer.value == 0 ? 0 : -ENXIO;
+	ACPI_FREE(obj);
+	return rc;
+}
+
+static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len)
+{
+	struct crb_priv *priv = chip->vendor.priv;
+	int rc = 0;
+
+	if (len > le32_to_cpu(ioread32(&priv->cca->cmd_size))) {
+		dev_err(&chip->dev,
+			"invalid command count value %x %zx\n",
+			(unsigned int) len,
+			(size_t) le32_to_cpu(ioread32(&priv->cca->cmd_size)));
+		return -E2BIG;
+	}
+
+	memcpy_toio(priv->cmd, buf, len);
+
+	/* Make sure that cmd is populated before issuing start. */
+	wmb();
+
+	if (priv->flags & CRB_FL_CRB_START)
+		iowrite32(cpu_to_le32(CRB_START_INVOKE), &priv->cca->start);
+
+	if (priv->flags & CRB_FL_ACPI_START)
+		rc = crb_do_acpi_start(chip);
+
+	return rc;
+}
+
+static void crb_cancel(struct tpm_chip *chip)
+{
+	struct crb_priv *priv = chip->vendor.priv;
+
+	iowrite32(cpu_to_le32(CRB_CANCEL_INVOKE), &priv->cca->cancel);
+
+	/* Make sure that cmd is populated before issuing cancel. */
+	wmb();
+
+	if ((priv->flags & CRB_FL_ACPI_START) && crb_do_acpi_start(chip))
+		dev_err(&chip->dev, "ACPI Start failed\n");
+
+	iowrite32(0, &priv->cca->cancel);
+}
+
+static bool crb_req_canceled(struct tpm_chip *chip, u8 status)
+{
+	struct crb_priv *priv = chip->vendor.priv;
+	u32 cancel = le32_to_cpu(ioread32(&priv->cca->cancel));
+
+	return (cancel & CRB_CANCEL_INVOKE) == CRB_CANCEL_INVOKE;
+}
+
+static const struct tpm_class_ops tpm_crb = {
+	.status = crb_status,
+	.recv = crb_recv,
+	.send = crb_send,
+	.cancel = crb_cancel,
+	.req_canceled = crb_req_canceled,
+	.req_complete_mask = CRB_STS_COMPLETE,
+	.req_complete_val = CRB_STS_COMPLETE,
+};
+
+static int crb_acpi_add(struct acpi_device *device)
+{
+	struct tpm_chip *chip;
+	struct acpi_tpm2 *buf;
+	struct crb_priv *priv;
+	struct device *dev = &device->dev;
+	acpi_status status;
+	u32 sm;
+	u64 pa;
+	int rc;
+
+	chip = tpmm_chip_alloc(dev, &tpm_crb);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+
+	chip->flags = TPM_CHIP_FLAG_TPM2;
+
+	status = acpi_get_table(ACPI_SIG_TPM2, 1,
+				(struct acpi_table_header **) &buf);
+	if (ACPI_FAILURE(status)) {
+		dev_err(dev, "failed to get TPM2 ACPI table\n");
+		return -ENODEV;
+	}
+
+	if (buf->hdr.length < sizeof(struct acpi_tpm2)) {
+		dev_err(dev, "TPM2 ACPI table has wrong size");
+		return -EINVAL;
+	}
+
+	priv = (struct crb_priv *) devm_kzalloc(dev, sizeof(struct crb_priv),
+						GFP_KERNEL);
+	if (!priv) {
+		dev_err(dev, "failed to devm_kzalloc for private data\n");
+		return -ENOMEM;
+	}
+
+	sm = le32_to_cpu(buf->start_method);
+
+	/* The reason for the extra quirk is that the PTT in 4th Gen Core CPUs
+	 * report only ACPI start but in practice seems to require both
+	 * ACPI start and CRB start.
+	 */
+	if (sm == CRB_SM_CRB || sm == CRB_SM_CRB_WITH_ACPI_START ||
+	    !strcmp(acpi_device_hid(device), "MSFT0101"))
+		priv->flags |= CRB_FL_CRB_START;
+
+	if (sm == CRB_SM_ACPI_START || sm == CRB_SM_CRB_WITH_ACPI_START)
+		priv->flags |= CRB_FL_ACPI_START;
+
+	priv->cca = (struct crb_control_area __iomem *)
+		devm_ioremap_nocache(dev, buf->control_area_pa, 0x1000);
+	if (!priv->cca) {
+		dev_err(dev, "ioremap of the control area failed\n");
+		return -ENOMEM;
+	}
+
+	memcpy_fromio(&pa, &priv->cca->cmd_pa, 8);
+	pa = le64_to_cpu(pa);
+	priv->cmd = devm_ioremap_nocache(dev, le64_to_cpu(pa),
+					 ioread32(&priv->cca->cmd_size));
+	if (!priv->cmd) {
+		dev_err(dev, "ioremap of the command buffer failed\n");
+		return -ENOMEM;
+	}
+
+	memcpy_fromio(&pa, &priv->cca->rsp_pa, 8);
+	pa = le64_to_cpu(pa);
+	priv->rsp = devm_ioremap_nocache(dev, le64_to_cpu(pa),
+					 ioread32(&priv->cca->rsp_size));
+	if (!priv->rsp) {
+		dev_err(dev, "ioremap of the response buffer failed\n");
+		return -ENOMEM;
+	}
+
+	chip->vendor.priv = priv;
+
+	/* Default timeouts and durations */
+	chip->vendor.timeout_a = msecs_to_jiffies(TPM2_TIMEOUT_A);
+	chip->vendor.timeout_b = msecs_to_jiffies(TPM2_TIMEOUT_B);
+	chip->vendor.timeout_c = msecs_to_jiffies(TPM2_TIMEOUT_C);
+	chip->vendor.timeout_d = msecs_to_jiffies(TPM2_TIMEOUT_D);
+	chip->vendor.duration[TPM_SHORT] =
+		msecs_to_jiffies(TPM2_DURATION_SHORT);
+	chip->vendor.duration[TPM_MEDIUM] =
+		msecs_to_jiffies(TPM2_DURATION_MEDIUM);
+	chip->vendor.duration[TPM_LONG] =
+		msecs_to_jiffies(TPM2_DURATION_LONG);
+
+	chip->acpi_dev_handle = device->handle;
+
+	rc = tpm2_do_selftest(chip);
+	if (rc)
+		return rc;
+
+	return tpm_chip_register(chip);
+}
+
+static int crb_acpi_remove(struct acpi_device *device)
+{
+	struct device *dev = &device->dev;
+	struct tpm_chip *chip = dev_get_drvdata(dev);
+
+	tpm_chip_unregister(chip);
+	return 0;
+}
+
+static struct acpi_device_id crb_device_ids[] = {
+	{"MSFT0101", 0},
+	{"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, crb_device_ids);
+
+static struct acpi_driver crb_acpi_driver = {
+	.name = "tpm_crb",
+	.ids = crb_device_ids,
+	.ops = {
+		.add = crb_acpi_add,
+		.remove = crb_acpi_remove,
+	},
+	.drv = {
+		.pm = &crb_pm,
+	},
+};
+
+module_acpi_driver(crb_acpi_driver);
+MODULE_AUTHOR("Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>");
+MODULE_DESCRIPTION("TPM2 Driver");
+MODULE_VERSION("0.1");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/tpm/tpm_i2c_atmel.c b/drivers/char/tpm/tpm_i2c_atmel.c
index 77272925dee6..7a0ca78ad3c6 100644
--- a/drivers/char/tpm/tpm_i2c_atmel.c
+++ b/drivers/char/tpm/tpm_i2c_atmel.c
@@ -52,7 +52,7 @@ struct priv_data {
 static int i2c_atmel_send(struct tpm_chip *chip, u8 *buf, size_t len)
 {
 	struct priv_data *priv = chip->vendor.priv;
-	struct i2c_client *client = to_i2c_client(chip->dev);
+	struct i2c_client *client = to_i2c_client(chip->pdev);
 	s32 status;
 
 	priv->len = 0;
@@ -62,7 +62,7 @@ static int i2c_atmel_send(struct tpm_chip *chip, u8 *buf, size_t len)
 
 	status = i2c_master_send(client, buf, len);
 
-	dev_dbg(chip->dev,
+	dev_dbg(chip->pdev,
 		"%s(buf=%*ph len=%0zx) -> sts=%d\n", __func__,
 		(int)min_t(size_t, 64, len), buf, len, status);
 	return status;
@@ -71,7 +71,7 @@ static int i2c_atmel_send(struct tpm_chip *chip, u8 *buf, size_t len)
 static int i2c_atmel_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 {
 	struct priv_data *priv = chip->vendor.priv;
-	struct i2c_client *client = to_i2c_client(chip->dev);
+	struct i2c_client *client = to_i2c_client(chip->pdev);
 	struct tpm_output_header *hdr =
 		(struct tpm_output_header *)priv->buffer;
 	u32 expected_len;
@@ -88,7 +88,7 @@ static int i2c_atmel_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 		return -ENOMEM;
 
 	if (priv->len >= expected_len) {
-		dev_dbg(chip->dev,
+		dev_dbg(chip->pdev,
 			"%s early(buf=%*ph count=%0zx) -> ret=%d\n", __func__,
 			(int)min_t(size_t, 64, expected_len), buf, count,
 			expected_len);
@@ -97,7 +97,7 @@ static int i2c_atmel_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 	}
 
 	rc = i2c_master_recv(client, buf, expected_len);
-	dev_dbg(chip->dev,
+	dev_dbg(chip->pdev,
 		"%s reread(buf=%*ph count=%0zx) -> ret=%d\n", __func__,
 		(int)min_t(size_t, 64, expected_len), buf, count,
 		expected_len);
@@ -106,13 +106,13 @@ static int i2c_atmel_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 
 static void i2c_atmel_cancel(struct tpm_chip *chip)
 {
-	dev_err(chip->dev, "TPM operation cancellation was requested, but is not supported");
+	dev_err(chip->pdev, "TPM operation cancellation was requested, but is not supported");
 }
 
 static u8 i2c_atmel_read_status(struct tpm_chip *chip)
 {
 	struct priv_data *priv = chip->vendor.priv;
-	struct i2c_client *client = to_i2c_client(chip->dev);
+	struct i2c_client *client = to_i2c_client(chip->pdev);
 	int rc;
 
 	/* The TPM fails the I2C read until it is ready, so we do the entire
@@ -125,7 +125,7 @@ static u8 i2c_atmel_read_status(struct tpm_chip *chip)
 	/* Once the TPM has completed the command the command remains readable
 	 * until another command is issued. */
 	rc = i2c_master_recv(client, priv->buffer, sizeof(priv->buffer));
-	dev_dbg(chip->dev,
+	dev_dbg(chip->pdev,
 		"%s: sts=%d", __func__, rc);
 	if (rc <= 0)
 		return 0;
@@ -153,21 +153,20 @@ static const struct tpm_class_ops i2c_atmel = {
 static int i2c_atmel_probe(struct i2c_client *client,
 			   const struct i2c_device_id *id)
 {
-	int rc;
 	struct tpm_chip *chip;
 	struct device *dev = &client->dev;
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 		return -ENODEV;
 
-	chip = tpm_register_hardware(dev, &i2c_atmel);
-	if (!chip) {
-		dev_err(dev, "%s() error in tpm_register_hardware\n", __func__);
-		return -ENODEV;
-	}
+	chip = tpmm_chip_alloc(dev, &i2c_atmel);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
 
 	chip->vendor.priv = devm_kzalloc(dev, sizeof(struct priv_data),
 					 GFP_KERNEL);
+	if (!chip->vendor.priv)
+		return -ENOMEM;
 
 	/* Default timeouts */
 	chip->vendor.timeout_a = msecs_to_jiffies(TPM_I2C_SHORT_TIMEOUT);
@@ -179,33 +178,20 @@ static int i2c_atmel_probe(struct i2c_client *client,
 	/* There is no known way to probe for this device, and all version
 	 * information seems to be read via TPM commands. Thus we rely on the
 	 * TPM startup process in the common code to detect the device. */
-	if (tpm_get_timeouts(chip)) {
-		rc = -ENODEV;
-		goto out_err;
-	}
-
-	if (tpm_do_selftest(chip)) {
-		rc = -ENODEV;
-		goto out_err;
-	}
+	if (tpm_get_timeouts(chip))
+		return -ENODEV;
 
-	return 0;
+	if (tpm_do_selftest(chip))
+		return -ENODEV;
 
-out_err:
-	tpm_dev_vendor_release(chip);
-	tpm_remove_hardware(chip->dev);
-	return rc;
+	return tpm_chip_register(chip);
 }
 
 static int i2c_atmel_remove(struct i2c_client *client)
 {
 	struct device *dev = &(client->dev);
 	struct tpm_chip *chip = dev_get_drvdata(dev);
-
-	if (chip)
-		tpm_dev_vendor_release(chip);
-	tpm_remove_hardware(dev);
-	kfree(chip);
+	tpm_chip_unregister(chip);
 	return 0;
 }
 
diff --git a/drivers/char/tpm/tpm_i2c_infineon.c b/drivers/char/tpm/tpm_i2c_infineon.c
index 472af4bb1b61..33c5f360ab01 100644
--- a/drivers/char/tpm/tpm_i2c_infineon.c
+++ b/drivers/char/tpm/tpm_i2c_infineon.c
@@ -446,7 +446,7 @@ static int tpm_tis_i2c_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 	/* read first 10 bytes, including tag, paramsize, and result */
 	size = recv_data(chip, buf, TPM_HEADER_SIZE);
 	if (size < TPM_HEADER_SIZE) {
-		dev_err(chip->dev, "Unable to read header\n");
+		dev_err(chip->pdev, "Unable to read header\n");
 		goto out;
 	}
 
@@ -459,14 +459,14 @@ static int tpm_tis_i2c_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 	size += recv_data(chip, &buf[TPM_HEADER_SIZE],
 			  expected - TPM_HEADER_SIZE);
 	if (size < expected) {
-		dev_err(chip->dev, "Unable to read remainder of result\n");
+		dev_err(chip->pdev, "Unable to read remainder of result\n");
 		size = -ETIME;
 		goto out;
 	}
 
 	wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, &status);
 	if (status & TPM_STS_DATA_AVAIL) {	/* retry? */
-		dev_err(chip->dev, "Error left over data\n");
+		dev_err(chip->pdev, "Error left over data\n");
 		size = -EIO;
 		goto out;
 	}
@@ -581,12 +581,9 @@ static int tpm_tis_i2c_init(struct device *dev)
 	int rc = 0;
 	struct tpm_chip *chip;
 
-	chip = tpm_register_hardware(dev, &tpm_tis_i2c);
-	if (!chip) {
-		dev_err(dev, "could not register hardware\n");
-		rc = -ENODEV;
-		goto out_err;
-	}
+	chip = tpmm_chip_alloc(dev, &tpm_tis_i2c);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
 
 	/* Disable interrupts */
 	chip->vendor.irq = 0;
@@ -600,7 +597,7 @@ static int tpm_tis_i2c_init(struct device *dev)
 	if (request_locality(chip, 0) != 0) {
 		dev_err(dev, "could not request locality\n");
 		rc = -ENODEV;
-		goto out_vendor;
+		goto out_err;
 	}
 
 	/* read four bytes from DID_VID register */
@@ -628,21 +625,9 @@ static int tpm_tis_i2c_init(struct device *dev)
 	tpm_get_timeouts(chip);
 	tpm_do_selftest(chip);
 
-	return 0;
-
+	return tpm_chip_register(chip);
 out_release:
 	release_locality(chip, chip->vendor.locality, 1);
-
-out_vendor:
-	/* close file handles */
-	tpm_dev_vendor_release(chip);
-
-	/* remove hardware */
-	tpm_remove_hardware(chip->dev);
-
-	/* reset these pointers, otherwise we oops */
-	chip->dev->release = NULL;
-	chip->release = NULL;
 	tpm_dev.client = NULL;
 out_err:
 	return rc;
@@ -712,17 +697,9 @@ static int tpm_tis_i2c_probe(struct i2c_client *client,
 static int tpm_tis_i2c_remove(struct i2c_client *client)
 {
 	struct tpm_chip *chip = tpm_dev.chip;
-	release_locality(chip, chip->vendor.locality, 1);
 
-	/* close file handles */
-	tpm_dev_vendor_release(chip);
-
-	/* remove hardware */
-	tpm_remove_hardware(chip->dev);
-
-	/* reset these pointers, otherwise we oops */
-	chip->dev->release = NULL;
-	chip->release = NULL;
+	tpm_chip_unregister(chip);
+	release_locality(chip, chip->vendor.locality, 1);
 	tpm_dev.client = NULL;
 
 	return 0;
diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c
index 7b158efd49f7..9d42b7d78e50 100644
--- a/drivers/char/tpm/tpm_i2c_nuvoton.c
+++ b/drivers/char/tpm/tpm_i2c_nuvoton.c
@@ -96,13 +96,13 @@ static s32 i2c_nuvoton_write_buf(struct i2c_client *client, u8 offset, u8 size,
 /* read TPM_STS register */
 static u8 i2c_nuvoton_read_status(struct tpm_chip *chip)
 {
-	struct i2c_client *client = to_i2c_client(chip->dev);
+	struct i2c_client *client = to_i2c_client(chip->pdev);
 	s32 status;
 	u8 data;
 
 	status = i2c_nuvoton_read_buf(client, TPM_STS, 1, &data);
 	if (status <= 0) {
-		dev_err(chip->dev, "%s() error return %d\n", __func__,
+		dev_err(chip->pdev, "%s() error return %d\n", __func__,
 			status);
 		data = TPM_STS_ERR_VAL;
 	}
@@ -127,13 +127,13 @@ static s32 i2c_nuvoton_write_status(struct i2c_client *client, u8 data)
 /* write commandReady to TPM_STS register */
 static void i2c_nuvoton_ready(struct tpm_chip *chip)
 {
-	struct i2c_client *client = to_i2c_client(chip->dev);
+	struct i2c_client *client = to_i2c_client(chip->pdev);
 	s32 status;
 
 	/* this causes the current command to be aborted */
 	status = i2c_nuvoton_write_status(client, TPM_STS_COMMAND_READY);
 	if (status < 0)
-		dev_err(chip->dev,
+		dev_err(chip->pdev,
 			"%s() fail to write TPM_STS.commandReady\n", __func__);
 }
 
@@ -212,7 +212,7 @@ static int i2c_nuvoton_wait_for_stat(struct tpm_chip *chip, u8 mask, u8 value,
 				return 0;
 		} while (time_before(jiffies, stop));
 	}
-	dev_err(chip->dev, "%s(%02x, %02x) -> timeout\n", __func__, mask,
+	dev_err(chip->pdev, "%s(%02x, %02x) -> timeout\n", __func__, mask,
 		value);
 	return -ETIMEDOUT;
 }
@@ -240,7 +240,7 @@ static int i2c_nuvoton_recv_data(struct i2c_client *client,
 					       &chip->vendor.read_queue) == 0) {
 		burst_count = i2c_nuvoton_get_burstcount(client, chip);
 		if (burst_count < 0) {
-			dev_err(chip->dev,
+			dev_err(chip->pdev,
 				"%s() fail to read burstCount=%d\n", __func__,
 				burst_count);
 			return -EIO;
@@ -249,12 +249,12 @@ static int i2c_nuvoton_recv_data(struct i2c_client *client,
 		rc = i2c_nuvoton_read_buf(client, TPM_DATA_FIFO_R,
 					  bytes2read, &buf[size]);
 		if (rc < 0) {
-			dev_err(chip->dev,
+			dev_err(chip->pdev,
 				"%s() fail on i2c_nuvoton_read_buf()=%d\n",
 				__func__, rc);
 			return -EIO;
 		}
-		dev_dbg(chip->dev, "%s(%d):", __func__, bytes2read);
+		dev_dbg(chip->pdev, "%s(%d):", __func__, bytes2read);
 		size += bytes2read;
 	}
 
@@ -264,7 +264,7 @@ static int i2c_nuvoton_recv_data(struct i2c_client *client,
 /* Read TPM command results */
 static int i2c_nuvoton_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 {
-	struct device *dev = chip->dev;
+	struct device *dev = chip->pdev;
 	struct i2c_client *client = to_i2c_client(dev);
 	s32 rc;
 	int expected, status, burst_count, retries, size = 0;
@@ -334,7 +334,7 @@ static int i2c_nuvoton_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 		break;
 	}
 	i2c_nuvoton_ready(chip);
-	dev_dbg(chip->dev, "%s() -> %d\n", __func__, size);
+	dev_dbg(chip->pdev, "%s() -> %d\n", __func__, size);
 	return size;
 }
 
@@ -347,7 +347,7 @@ static int i2c_nuvoton_recv(struct tpm_chip *chip, u8 *buf, size_t count)
  */
 static int i2c_nuvoton_send(struct tpm_chip *chip, u8 *buf, size_t len)
 {
-	struct device *dev = chip->dev;
+	struct device *dev = chip->pdev;
 	struct i2c_client *client = to_i2c_client(dev);
 	u32 ordinal;
 	size_t count = 0;
@@ -530,14 +530,15 @@ static int i2c_nuvoton_probe(struct i2c_client *client,
 	dev_info(dev, "VID: %04X DID: %02X RID: %02X\n", (u16) vid,
 		 (u8) (vid >> 16), (u8) (vid >> 24));
 
-	chip = tpm_register_hardware(dev, &tpm_i2c);
-	if (!chip) {
-		dev_err(dev, "%s() error in tpm_register_hardware\n", __func__);
-		return -ENODEV;
-	}
+	chip = tpmm_chip_alloc(dev, &tpm_i2c);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
 
 	chip->vendor.priv = devm_kzalloc(dev, sizeof(struct priv_data),
 					 GFP_KERNEL);
+	if (!chip->vendor.priv)
+		return -ENOMEM;
+
 	init_waitqueue_head(&chip->vendor.read_queue);
 	init_waitqueue_head(&chip->vendor.int_queue);
 
@@ -559,7 +560,7 @@ static int i2c_nuvoton_probe(struct i2c_client *client,
 		rc = devm_request_irq(dev, chip->vendor.irq,
 				      i2c_nuvoton_int_handler,
 				      IRQF_TRIGGER_LOW,
-				      chip->vendor.miscdev.name,
+				      chip->devname,
 				      chip);
 		if (rc) {
 			dev_err(dev, "%s() Unable to request irq: %d for use\n",
@@ -584,7 +585,7 @@ static int i2c_nuvoton_probe(struct i2c_client *client,
 							   TPM_DATA_FIFO_W,
 							   1, (u8 *) (&rc));
 				if (rc < 0)
-					goto out_err;
+					return rc;
 				/* TPM_STS <- 0x40 (commandReady) */
 				i2c_nuvoton_ready(chip);
 			} else {
@@ -594,45 +595,29 @@ static int i2c_nuvoton_probe(struct i2c_client *client,
 				 * only TPM_STS_VALID should be set
 				 */
 				if (i2c_nuvoton_read_status(chip) !=
-				    TPM_STS_VALID) {
-					rc = -EIO;
-					goto out_err;
-				}
+				    TPM_STS_VALID)
+					return -EIO;
 			}
 		}
 	}
 
-	if (tpm_get_timeouts(chip)) {
-		rc = -ENODEV;
-		goto out_err;
-	}
-
-	if (tpm_do_selftest(chip)) {
-		rc = -ENODEV;
-		goto out_err;
-	}
+	if (tpm_get_timeouts(chip))
+		return -ENODEV;
 
-	return 0;
+	if (tpm_do_selftest(chip))
+		return -ENODEV;
 
-out_err:
-	tpm_dev_vendor_release(chip);
-	tpm_remove_hardware(chip->dev);
-	return rc;
+	return tpm_chip_register(chip);
 }
 
 static int i2c_nuvoton_remove(struct i2c_client *client)
 {
 	struct device *dev = &(client->dev);
 	struct tpm_chip *chip = dev_get_drvdata(dev);
-
-	if (chip)
-		tpm_dev_vendor_release(chip);
-	tpm_remove_hardware(dev);
-	kfree(chip);
+	tpm_chip_unregister(chip);
 	return 0;
 }
 
-
 static const struct i2c_device_id i2c_nuvoton_id[] = {
 	{I2C_DRIVER_NAME, 0},
 	{}
diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 4669e3713428..612845b36c29 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -1,6 +1,6 @@
 /*
  * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
- * Copyright (C) 2009, 2010  STMicroelectronics
+ * Copyright (C) 2009, 2010, 2014  STMicroelectronics
  *
  * 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
@@ -12,11 +12,10 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
  *
- * STMicroelectronics version 1.2.0, Copyright (C) 2010
+ * STMicroelectronics version 1.2.1, Copyright (C) 2014
  * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
  * This is free software, and you are welcome to redistribute it
  * under certain conditions.
@@ -27,7 +26,7 @@
  *
  * @Synopsis:
  *	09/15/2010:	First shot driver tpm_tis driver for
-			 lpc is used as model.
+ *			 lpc is used as model.
  */
 
 #include <linux/pci.h>
@@ -39,18 +38,38 @@
 #include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/wait.h>
+#include <linux/freezer.h>
 #include <linux/string.h>
 #include <linux/interrupt.h>
-#include <linux/spinlock.h>
 #include <linux/sysfs.h>
 #include <linux/gpio.h>
 #include <linux/sched.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>
 #include <linux/slab.h>
+#include <linux/of_irq.h>
+#include <linux/of_gpio.h>
 
+#include <linux/platform_data/tpm_stm_st33.h>
 #include "tpm.h"
-#include "tpm_i2c_stm_st33.h"
+
+#define TPM_ACCESS			0x0
+#define TPM_STS				0x18
+#define TPM_HASH_END			0x20
+#define TPM_DATA_FIFO			0x24
+#define TPM_HASH_DATA			0x24
+#define TPM_HASH_START			0x28
+#define TPM_INTF_CAPABILITY		0x14
+#define TPM_INT_STATUS			0x10
+#define TPM_INT_ENABLE			0x08
+
+#define TPM_DUMMY_BYTE			0xAA
+#define TPM_WRITE_DIRECTION		0x80
+#define TPM_HEADER_SIZE			10
+#define TPM_BUFSIZE			2048
+
+#define LOCALITY0		0
+
 
 enum stm33zp24_access {
 	TPM_ACCESS_VALID = 0x80,
@@ -82,6 +101,14 @@ enum tis_defaults {
 	TIS_LONG_TIMEOUT = 2000,
 };
 
+struct tpm_stm_dev {
+	struct i2c_client *client;
+	struct tpm_chip *chip;
+	u8 buf[TPM_BUFSIZE + 1];
+	u32 intrs;
+	int io_lpcpd;
+};
+
 /*
  * write8_reg
  * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
@@ -90,17 +117,12 @@ enum tis_defaults {
  * @param: tpm_size, The length of the data
  * @return: Returns negative errno, or else the number of bytes written.
  */
-static int write8_reg(struct i2c_client *client, u8 tpm_register,
+static int write8_reg(struct tpm_stm_dev *tpm_dev, u8 tpm_register,
 		      u8 *tpm_data, u16 tpm_size)
 {
-	struct st33zp24_platform_data *pin_infos;
-
-	pin_infos = client->dev.platform_data;
-
-	pin_infos->tpm_i2c_buffer[0][0] = tpm_register;
-	memcpy(&pin_infos->tpm_i2c_buffer[0][1], tpm_data, tpm_size);
-	return i2c_master_send(client, pin_infos->tpm_i2c_buffer[0],
-				tpm_size + 1);
+	tpm_dev->buf[0] = tpm_register;
+	memcpy(tpm_dev->buf + 1, tpm_data, tpm_size);
+	return i2c_master_send(tpm_dev->client, tpm_dev->buf, tpm_size + 1);
 } /* write8_reg() */
 
 /*
@@ -111,101 +133,58 @@ static int write8_reg(struct i2c_client *client, u8 tpm_register,
  * @param: tpm_size, tpm TPM response size to read.
  * @return: number of byte read successfully: should be one if success.
  */
-static int read8_reg(struct i2c_client *client, u8 tpm_register,
+static int read8_reg(struct tpm_stm_dev *tpm_dev, u8 tpm_register,
 		    u8 *tpm_data, int tpm_size)
 {
 	u8 status = 0;
 	u8 data;
 
 	data = TPM_DUMMY_BYTE;
-	status = write8_reg(client, tpm_register, &data, 1);
+	status = write8_reg(tpm_dev, tpm_register, &data, 1);
 	if (status == 2)
-		status = i2c_master_recv(client, tpm_data, tpm_size);
+		status = i2c_master_recv(tpm_dev->client, tpm_data, tpm_size);
 	return status;
 } /* read8_reg() */
 
 /*
  * I2C_WRITE_DATA
  * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
- * @param: client, the chip description
+ * @param: tpm_dev, the chip description
  * @param: tpm_register, the tpm tis register where the data should be written
  * @param: tpm_data, the tpm_data to write inside the tpm_register
  * @param: tpm_size, The length of the data
  * @return: number of byte written successfully: should be one if success.
  */
-#define I2C_WRITE_DATA(client, tpm_register, tpm_data, tpm_size) \
-	(write8_reg(client, tpm_register | \
+#define I2C_WRITE_DATA(tpm_dev, tpm_register, tpm_data, tpm_size) \
+	(write8_reg(tpm_dev, tpm_register | \
 	TPM_WRITE_DIRECTION, tpm_data, tpm_size))
 
 /*
  * I2C_READ_DATA
  * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
- * @param: tpm, the chip description
+ * @param: tpm_dev, the chip description
  * @param: tpm_register, the tpm tis register where the data should be read
  * @param: tpm_data, the TPM response
  * @param: tpm_size, tpm TPM response size to read.
  * @return: number of byte read successfully: should be one if success.
  */
-#define I2C_READ_DATA(client, tpm_register, tpm_data, tpm_size) \
-	(read8_reg(client, tpm_register, tpm_data, tpm_size))
+#define I2C_READ_DATA(tpm_dev, tpm_register, tpm_data, tpm_size) \
+	(read8_reg(tpm_dev, tpm_register, tpm_data, tpm_size))
 
 /*
  * clear_interruption
  * clear the TPM interrupt register.
  * @param: tpm, the chip description
+ * @return: the TPM_INT_STATUS value
  */
-static void clear_interruption(struct i2c_client *client)
+static u8 clear_interruption(struct tpm_stm_dev *tpm_dev)
 {
 	u8 interrupt;
-	I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
-	I2C_WRITE_DATA(client, TPM_INT_STATUS, &interrupt, 1);
-	I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
-} /* clear_interruption() */
-
-/*
- * _wait_for_interrupt_serirq_timeout
- * @param: tpm, the chip description
- * @param: timeout, the timeout of the interrupt
- * @return: the status of the interruption.
- */
-static long _wait_for_interrupt_serirq_timeout(struct tpm_chip *chip,
-						unsigned long timeout)
-{
-	long status;
-	struct i2c_client *client;
-	struct st33zp24_platform_data *pin_infos;
-
-	client = (struct i2c_client *)TPM_VPRIV(chip);
-	pin_infos = client->dev.platform_data;
-
-	status = wait_for_completion_interruptible_timeout(
-					&pin_infos->irq_detection,
-						timeout);
-	if (status > 0)
-		enable_irq(gpio_to_irq(pin_infos->io_serirq));
-	gpio_direction_input(pin_infos->io_serirq);
-
-	return status;
-} /* wait_for_interrupt_serirq_timeout() */
-
-static int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
-				 unsigned long timeout)
-{
-	int status = 2;
-	struct i2c_client *client;
-
-	client = (struct i2c_client *)TPM_VPRIV(chip);
 
-	status = _wait_for_interrupt_serirq_timeout(chip, timeout);
-	if (!status) {
-		status = -EBUSY;
-	} else {
-		clear_interruption(client);
-		if (condition)
-			status = 1;
-	}
-	return status;
-}
+	I2C_READ_DATA(tpm_dev, TPM_INT_STATUS, &interrupt, 1);
+	I2C_WRITE_DATA(tpm_dev, TPM_INT_STATUS, &interrupt, 1);
+	return interrupt;
+} /* clear_interruption() */
 
 /*
  * tpm_stm_i2c_cancel, cancel is not implemented.
@@ -213,16 +192,14 @@ static int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
  */
 static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
 {
-	struct i2c_client *client;
+	struct tpm_stm_dev *tpm_dev;
 	u8 data;
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
 
 	data = TPM_STS_COMMAND_READY;
-	I2C_WRITE_DATA(client, TPM_STS, &data, 1);
-	if (chip->vendor.irq)
-		wait_for_serirq_timeout(chip, 1, chip->vendor.timeout_a);
-}	/* tpm_stm_i2c_cancel() */
+	I2C_WRITE_DATA(tpm_dev, TPM_STS, &data, 1);
+} /* tpm_stm_i2c_cancel() */
 
 /*
  * tpm_stm_spi_status return the TPM_STS register
@@ -231,13 +208,14 @@ static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
  */
 static u8 tpm_stm_i2c_status(struct tpm_chip *chip)
 {
-	struct i2c_client *client;
+	struct tpm_stm_dev *tpm_dev;
 	u8 data;
-	client = (struct i2c_client *)TPM_VPRIV(chip);
 
-	I2C_READ_DATA(client, TPM_STS, &data, 1);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
+
+	I2C_READ_DATA(tpm_dev, TPM_STS, &data, 1);
 	return data;
-}				/* tpm_stm_i2c_status() */
+} /* tpm_stm_i2c_status() */
 
 
 /*
@@ -247,20 +225,19 @@ static u8 tpm_stm_i2c_status(struct tpm_chip *chip)
  */
 static int check_locality(struct tpm_chip *chip)
 {
-	struct i2c_client *client;
+	struct tpm_stm_dev *tpm_dev;
 	u8 data;
 	u8 status;
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
 
-	status = I2C_READ_DATA(client, TPM_ACCESS, &data, 1);
+	status = I2C_READ_DATA(tpm_dev, TPM_ACCESS, &data, 1);
 	if (status && (data &
 		(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
 		(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
 		return chip->vendor.locality;
 
 	return -EACCES;
-
 } /* check_locality() */
 
 /*
@@ -271,37 +248,31 @@ static int check_locality(struct tpm_chip *chip)
 static int request_locality(struct tpm_chip *chip)
 {
 	unsigned long stop;
-	long rc;
-	struct i2c_client *client;
+	long ret;
+	struct tpm_stm_dev *tpm_dev;
 	u8 data;
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
-
 	if (check_locality(chip) == chip->vendor.locality)
 		return chip->vendor.locality;
 
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
+
 	data = TPM_ACCESS_REQUEST_USE;
-	rc = I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
-	if (rc < 0)
+	ret = I2C_WRITE_DATA(tpm_dev, TPM_ACCESS, &data, 1);
+	if (ret < 0)
 		goto end;
 
-	if (chip->vendor.irq) {
-		rc = wait_for_serirq_timeout(chip, (check_locality
-						       (chip) >= 0),
-						      chip->vendor.timeout_a);
-		if (rc > 0)
+	stop = jiffies + chip->vendor.timeout_a;
+
+	/* Request locality is usually effective after the request */
+	do {
+		if (check_locality(chip) >= 0)
 			return chip->vendor.locality;
-	} else {
-		stop = jiffies + chip->vendor.timeout_a;
-		do {
-			if (check_locality(chip) >= 0)
-				return chip->vendor.locality;
-			msleep(TPM_TIMEOUT);
-		} while (time_before(jiffies, stop));
-	}
-	rc = -EACCES;
+		msleep(TPM_TIMEOUT);
+	} while (time_before(jiffies, stop));
+	ret = -EACCES;
 end:
-	return rc;
+	return ret;
 } /* request_locality() */
 
 /*
@@ -310,13 +281,13 @@ end:
  */
 static void release_locality(struct tpm_chip *chip)
 {
-	struct i2c_client *client;
+	struct tpm_stm_dev *tpm_dev;
 	u8 data;
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
 	data = TPM_ACCESS_ACTIVE_LOCALITY;
 
-	I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
+	I2C_WRITE_DATA(tpm_dev, TPM_ACCESS, &data, 1);
 }
 
 /*
@@ -329,19 +300,20 @@ static int get_burstcount(struct tpm_chip *chip)
 	unsigned long stop;
 	int burstcnt, status;
 	u8 tpm_reg, temp;
+	struct tpm_stm_dev *tpm_dev;
 
-	struct i2c_client *client = (struct i2c_client *)TPM_VPRIV(chip);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
 
 	stop = jiffies + chip->vendor.timeout_d;
 	do {
 		tpm_reg = TPM_STS + 1;
-		status = I2C_READ_DATA(client, tpm_reg, &temp, 1);
+		status = I2C_READ_DATA(tpm_dev, tpm_reg, &temp, 1);
 		if (status < 0)
 			goto end;
 
 		tpm_reg = tpm_reg + 1;
 		burstcnt = temp;
-		status = I2C_READ_DATA(client, tpm_reg, &temp, 1);
+		status = I2C_READ_DATA(tpm_dev, tpm_reg, &temp, 1);
 		if (status < 0)
 			goto end;
 
@@ -355,36 +327,107 @@ end:
 	return -EBUSY;
 } /* get_burstcount() */
 
+static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
+				bool check_cancel, bool *canceled)
+{
+	u8 status = chip->ops->status(chip);
+
+	*canceled = false;
+	if ((status & mask) == mask)
+		return true;
+	if (check_cancel && chip->ops->req_canceled(chip, status)) {
+		*canceled = true;
+		return true;
+	}
+	return false;
+}
+
+/*
+ * interrupt_to_status
+ * @param: irq_mask, the irq mask value to wait
+ * @return: the corresponding tpm_sts value
+ */
+static u8 interrupt_to_status(u8 irq_mask)
+{
+	u8 status = 0;
+
+	if ((irq_mask & TPM_INTF_STS_VALID_INT) == TPM_INTF_STS_VALID_INT)
+		status |= TPM_STS_VALID;
+	if ((irq_mask & TPM_INTF_DATA_AVAIL_INT) == TPM_INTF_DATA_AVAIL_INT)
+		status |= TPM_STS_DATA_AVAIL;
+	if ((irq_mask & TPM_INTF_CMD_READY_INT) == TPM_INTF_CMD_READY_INT)
+		status |= TPM_STS_COMMAND_READY;
+
+	return status;
+} /* status_to_interrupt() */
+
 /*
  * wait_for_stat wait for a TPM_STS value
  * @param: chip, the tpm chip description
  * @param: mask, the value mask to wait
  * @param: timeout, the timeout
  * @param: queue, the wait queue.
+ * @param: check_cancel, does the command can be cancelled ?
  * @return: the tpm status, 0 if success, -ETIME if timeout is reached.
  */
 static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
-			 wait_queue_head_t *queue)
+			wait_queue_head_t *queue, bool check_cancel)
 {
 	unsigned long stop;
-	long rc;
-	u8 status;
+	int ret;
+	bool canceled = false;
+	bool condition;
+	u32 cur_intrs;
+	u8 interrupt, status;
+	struct tpm_stm_dev *tpm_dev;
 
-	 if (chip->vendor.irq) {
-		rc = wait_for_serirq_timeout(chip, ((tpm_stm_i2c_status
-							(chip) & mask) ==
-						       mask), timeout);
-		if (rc > 0)
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
+
+	/* check current status */
+	status = tpm_stm_i2c_status(chip);
+	if ((status & mask) == mask)
+		return 0;
+
+	stop = jiffies + timeout;
+
+	if (chip->vendor.irq) {
+		cur_intrs = tpm_dev->intrs;
+		interrupt = clear_interruption(tpm_dev);
+		enable_irq(chip->vendor.irq);
+
+again:
+		timeout = stop - jiffies;
+		if ((long) timeout <= 0)
+			return -1;
+
+		ret = wait_event_interruptible_timeout(*queue,
+					cur_intrs != tpm_dev->intrs, timeout);
+
+		interrupt |= clear_interruption(tpm_dev);
+		status = interrupt_to_status(interrupt);
+		condition = wait_for_tpm_stat_cond(chip, mask,
+						   check_cancel, &canceled);
+
+		if (ret >= 0 && condition) {
+			if (canceled)
+				return -ECANCELED;
 			return 0;
+		}
+		if (ret == -ERESTARTSYS && freezing(current)) {
+			clear_thread_flag(TIF_SIGPENDING);
+			goto again;
+		}
+		disable_irq_nosync(chip->vendor.irq);
+
 	} else {
-		stop = jiffies + timeout;
 		do {
 			msleep(TPM_TIMEOUT);
-			status = tpm_stm_i2c_status(chip);
+			status = chip->ops->status(chip);
 			if ((status & mask) == mask)
 				return 0;
 		} while (time_before(jiffies, stop));
 	}
+
 	return -ETIME;
 } /* wait_for_stat() */
 
@@ -397,22 +440,24 @@ static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
  */
 static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 {
-	int size = 0, burstcnt, len;
-	struct i2c_client *client;
+	int size = 0, burstcnt, len, ret;
+	struct tpm_stm_dev *tpm_dev;
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
 
 	while (size < count &&
 	       wait_for_stat(chip,
 			     TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 			     chip->vendor.timeout_c,
-			     &chip->vendor.read_queue)
-	       == 0) {
+			     &chip->vendor.read_queue, true) == 0) {
 		burstcnt = get_burstcount(chip);
 		if (burstcnt < 0)
 			return burstcnt;
 		len = min_t(int, burstcnt, count - size);
-		I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len);
+		ret = I2C_READ_DATA(tpm_dev, TPM_DATA_FIFO, buf + size, len);
+		if (ret < 0)
+			return ret;
+
 		size += len;
 	}
 	return size;
@@ -427,15 +472,14 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
 {
 	struct tpm_chip *chip = dev_id;
-	struct i2c_client *client;
-	struct st33zp24_platform_data *pin_infos;
+	struct tpm_stm_dev *tpm_dev;
 
-	disable_irq_nosync(irq);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
-	pin_infos = client->dev.platform_data;
+	tpm_dev->intrs++;
+	wake_up_interruptible(&chip->vendor.read_queue);
+	disable_irq_nosync(chip->vendor.irq);
 
-	complete(&pin_infos->irq_detection);
 	return IRQ_HANDLED;
 } /* tpm_ioserirq_handler() */
 
@@ -457,13 +501,15 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 	int ret;
 	u8 data;
 	struct i2c_client *client;
+	struct tpm_stm_dev *tpm_dev;
 
-	if (chip == NULL)
+	if (!chip)
 		return -EBUSY;
 	if (len < TPM_HEADER_SIZE)
 		return -EBUSY;
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
+	client = tpm_dev->client;
 
 	client->flags = 0;
 
@@ -476,7 +522,7 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 		tpm_stm_i2c_cancel(chip);
 		if (wait_for_stat
 		    (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
-		     &chip->vendor.int_queue) < 0) {
+		     &chip->vendor.read_queue, false) < 0) {
 			ret = -ETIME;
 			goto out_err;
 		}
@@ -487,7 +533,7 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 		if (burstcnt < 0)
 			return burstcnt;
 		size = min_t(int, len - i - 1, burstcnt);
-		ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf, size);
+		ret = I2C_WRITE_DATA(tpm_dev, TPM_DATA_FIFO, buf + i, size);
 		if (ret < 0)
 			goto out_err;
 
@@ -500,7 +546,7 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 		goto out_err;
 	}
 
-	ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf + len - 1, 1);
+	ret = I2C_WRITE_DATA(tpm_dev, TPM_DATA_FIFO, buf + len - 1, 1);
 	if (ret < 0)
 		goto out_err;
 
@@ -511,7 +557,7 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 	}
 
 	data = TPM_STS_GO;
-	I2C_WRITE_DATA(client, TPM_STS, &data, 1);
+	I2C_WRITE_DATA(tpm_dev, TPM_STS, &data, 1);
 
 	return len;
 out_err:
@@ -526,7 +572,7 @@ out_err:
  * @param: buf,	the buffer to store datas.
  * @param: count, the number of bytes to send.
  * @return: In case of success the number of bytes received.
- *		In other case, a < 0 value describing the issue.
+ *	    In other case, a < 0 value describing the issue.
  */
 static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
 			    size_t count)
@@ -534,7 +580,7 @@ static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
 	int size = 0;
 	int expected;
 
-	if (chip == NULL)
+	if (!chip)
 		return -EBUSY;
 
 	if (count < TPM_HEADER_SIZE) {
@@ -544,7 +590,7 @@ static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
 
 	size = recv_data(chip, buf, TPM_HEADER_SIZE);
 	if (size < TPM_HEADER_SIZE) {
-		dev_err(chip->dev, "Unable to read header\n");
+		dev_err(chip->pdev, "Unable to read header\n");
 		goto out;
 	}
 
@@ -555,9 +601,9 @@ static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
 	}
 
 	size += recv_data(chip, &buf[TPM_HEADER_SIZE],
-					expected - TPM_HEADER_SIZE);
+			expected - TPM_HEADER_SIZE);
 	if (size < expected) {
-		dev_err(chip->dev, "Unable to read remainder of result\n");
+		dev_err(chip->pdev, "Unable to read remainder of result\n");
 		size = -ETIME;
 		goto out;
 	}
@@ -568,7 +614,7 @@ out:
 	return size;
 }
 
-static bool tpm_st33_i2c_req_canceled(struct tpm_chip *chip, u8 status)
+static bool tpm_stm_i2c_req_canceled(struct tpm_chip *chip, u8 status)
 {
 	return (status == TPM_STS_COMMAND_READY);
 }
@@ -580,75 +626,134 @@ static const struct tpm_class_ops st_i2c_tpm = {
 	.status = tpm_stm_i2c_status,
 	.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 	.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
-	.req_canceled = tpm_st33_i2c_req_canceled,
+	.req_canceled = tpm_stm_i2c_req_canceled,
 };
 
-static int interrupts;
-module_param(interrupts, int, 0444);
-MODULE_PARM_DESC(interrupts, "Enable interrupts");
+#ifdef CONFIG_OF
+static int tpm_stm_i2c_of_request_resources(struct tpm_chip *chip)
+{
+	struct device_node *pp;
+	struct tpm_stm_dev *tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
+	struct i2c_client *client = tpm_dev->client;
+	int gpio;
+	int ret;
+
+	pp = client->dev.of_node;
+	if (!pp) {
+		dev_err(chip->pdev, "No platform data\n");
+		return -ENODEV;
+	}
+
+	/* Get GPIO from device tree */
+	gpio = of_get_named_gpio(pp, "lpcpd-gpios", 0);
+	if (gpio < 0) {
+		dev_err(chip->pdev, "Failed to retrieve lpcpd-gpios from dts.\n");
+		tpm_dev->io_lpcpd = -1;
+		/*
+		 * lpcpd pin is not specified. This is not an issue as
+		 * power management can be also managed by TPM specific
+		 * commands. So leave with a success status code.
+		 */
+		return 0;
+	}
+	/* GPIO request and configuration */
+	ret = devm_gpio_request_one(&client->dev, gpio,
+			GPIOF_OUT_INIT_HIGH, "TPM IO LPCPD");
+	if (ret) {
+		dev_err(chip->pdev, "Failed to request lpcpd pin\n");
+		return -ENODEV;
+	}
+	tpm_dev->io_lpcpd = gpio;
+
+	return 0;
+}
+#else
+static int tpm_stm_i2c_of_request_resources(struct tpm_chip *chip)
+{
+	return -ENODEV;
+}
+#endif
 
-static int power_mgt = 1;
-module_param(power_mgt, int, 0444);
-MODULE_PARM_DESC(power_mgt, "Power Management");
+static int tpm_stm_i2c_request_resources(struct i2c_client *client,
+					 struct tpm_chip *chip)
+{
+	struct st33zp24_platform_data *pdata;
+	struct tpm_stm_dev *tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
+	int ret;
+
+	pdata = client->dev.platform_data;
+	if (!pdata) {
+		dev_err(chip->pdev, "No platform data\n");
+		return -ENODEV;
+	}
+
+	/* store for late use */
+	tpm_dev->io_lpcpd = pdata->io_lpcpd;
+
+	if (gpio_is_valid(pdata->io_lpcpd)) {
+		ret = devm_gpio_request_one(&client->dev,
+				pdata->io_lpcpd, GPIOF_OUT_INIT_HIGH,
+				"TPM IO_LPCPD");
+		if (ret) {
+			dev_err(chip->pdev, "%s : reset gpio_request failed\n",
+				__FILE__);
+			return ret;
+		}
+	}
+
+	return 0;
+}
 
 /*
- * tpm_st33_i2c_probe initialize the TPM device
+ * tpm_stm_i2c_probe initialize the TPM device
  * @param: client, the i2c_client drescription (TPM I2C description).
  * @param: id, the i2c_device_id struct.
  * @return: 0 in case of success.
  *	 -1 in other case.
  */
 static int
-tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
+tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
-	int err;
-	u8 intmask;
+	int ret;
+	u8 intmask = 0;
 	struct tpm_chip *chip;
 	struct st33zp24_platform_data *platform_data;
+	struct tpm_stm_dev *tpm_dev;
 
-	if (client == NULL) {
+	if (!client) {
 		pr_info("%s: i2c client is NULL. Device not accessible.\n",
 			__func__);
-		err = -ENODEV;
-		goto end;
+		return -ENODEV;
 	}
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		dev_info(&client->dev, "client not i2c capable\n");
-		err = -ENODEV;
-		goto end;
+		return -ENODEV;
 	}
 
-	chip = tpm_register_hardware(&client->dev, &st_i2c_tpm);
-	if (!chip) {
-		dev_info(&client->dev, "fail chip\n");
-		err = -ENODEV;
-		goto end;
-	}
+	tpm_dev = devm_kzalloc(&client->dev, sizeof(struct tpm_stm_dev),
+			       GFP_KERNEL);
+	if (!tpm_dev)
+		return -ENOMEM;
 
-	platform_data = client->dev.platform_data;
+	chip = tpmm_chip_alloc(&client->dev, &st_i2c_tpm);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
 
-	if (!platform_data) {
-		dev_info(&client->dev, "chip not available\n");
-		err = -ENODEV;
-		goto _tpm_clean_answer;
-	}
+	TPM_VPRIV(chip) = tpm_dev;
+	tpm_dev->client = client;
 
-	platform_data->tpm_i2c_buffer[0] =
-	    kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
-	if (platform_data->tpm_i2c_buffer[0] == NULL) {
-		err = -ENOMEM;
-		goto _tpm_clean_answer;
-	}
-	platform_data->tpm_i2c_buffer[1] =
-	    kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
-	if (platform_data->tpm_i2c_buffer[1] == NULL) {
-		err = -ENOMEM;
-		goto _tpm_clean_response1;
+	platform_data = client->dev.platform_data;
+	if (!platform_data && client->dev.of_node) {
+		ret = tpm_stm_i2c_of_request_resources(chip);
+		if (ret)
+			goto _tpm_clean_answer;
+	} else if (platform_data) {
+		ret = tpm_stm_i2c_request_resources(client, chip);
+		if (ret)
+			goto _tpm_clean_answer;
 	}
 
-	TPM_VPRIV(chip) = client;
-
 	chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 	chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
 	chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
@@ -656,59 +761,44 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
 	chip->vendor.locality = LOCALITY0;
 
-	if (power_mgt) {
-		err = gpio_request(platform_data->io_lpcpd, "TPM IO_LPCPD");
-		if (err)
-			goto _gpio_init1;
-		gpio_set_value(platform_data->io_lpcpd, 1);
-	}
+	if (client->irq) {
+		/* INTERRUPT Setup */
+		init_waitqueue_head(&chip->vendor.read_queue);
+		tpm_dev->intrs = 0;
 
-	if (interrupts) {
-		init_completion(&platform_data->irq_detection);
 		if (request_locality(chip) != LOCALITY0) {
-			err = -ENODEV;
-			goto _tpm_clean_response2;
+			ret = -ENODEV;
+			goto _tpm_clean_answer;
 		}
-		err = gpio_request(platform_data->io_serirq, "TPM IO_SERIRQ");
-		if (err)
-			goto _gpio_init2;
 
-		clear_interruption(client);
-		err = request_irq(gpio_to_irq(platform_data->io_serirq),
-				&tpm_ioserirq_handler,
+		clear_interruption(tpm_dev);
+		ret = devm_request_irq(&client->dev, client->irq,
+				tpm_ioserirq_handler,
 				IRQF_TRIGGER_HIGH,
 				"TPM SERIRQ management", chip);
-		if (err < 0) {
-			dev_err(chip->dev , "TPM SERIRQ signals %d not available\n",
-				gpio_to_irq(platform_data->io_serirq));
-			goto _irq_set;
+		if (ret < 0) {
+			dev_err(chip->pdev, "TPM SERIRQ signals %d not available\n",
+				client->irq);
+			goto _tpm_clean_answer;
 		}
 
-		err = I2C_READ_DATA(client, TPM_INT_ENABLE, &intmask, 1);
-		if (err < 0)
-			goto _irq_set;
-
 		intmask |= TPM_INTF_CMD_READY_INT
-			|  TPM_INTF_FIFO_AVALAIBLE_INT
-			|  TPM_INTF_WAKE_UP_READY_INT
-			|  TPM_INTF_LOCALITY_CHANGE_INT
 			|  TPM_INTF_STS_VALID_INT
 			|  TPM_INTF_DATA_AVAIL_INT;
 
-		err = I2C_WRITE_DATA(client, TPM_INT_ENABLE, &intmask, 1);
-		if (err < 0)
-			goto _irq_set;
+		ret = I2C_WRITE_DATA(tpm_dev, TPM_INT_ENABLE, &intmask, 1);
+		if (ret < 0)
+			goto _tpm_clean_answer;
 
 		intmask = TPM_GLOBAL_INT_ENABLE;
-		err = I2C_WRITE_DATA(client, (TPM_INT_ENABLE + 3), &intmask, 1);
-		if (err < 0)
-			goto _irq_set;
+		ret = I2C_WRITE_DATA(tpm_dev, (TPM_INT_ENABLE + 3),
+				     &intmask, 1);
+		if (ret < 0)
+			goto _tpm_clean_answer;
 
-		err = I2C_READ_DATA(client, TPM_INT_STATUS, &intmask, 1);
-		if (err < 0)
-			goto _irq_set;
+		chip->vendor.irq = client->irq;
 
-		chip->vendor.irq = interrupts;
+		disable_irq_nosync(chip->vendor.irq);
 
 		tpm_gen_interrupt(chip);
 	}
@@ -716,130 +806,106 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	tpm_get_timeouts(chip);
 	tpm_do_selftest(chip);
 
-	dev_info(chip->dev, "TPM I2C Initialized\n");
-	return 0;
-_irq_set:
-	free_irq(gpio_to_irq(platform_data->io_serirq), (void *)chip);
-_gpio_init2:
-	if (interrupts)
-		gpio_free(platform_data->io_serirq);
-_gpio_init1:
-	if (power_mgt)
-		gpio_free(platform_data->io_lpcpd);
-_tpm_clean_response2:
-	kzfree(platform_data->tpm_i2c_buffer[1]);
-	platform_data->tpm_i2c_buffer[1] = NULL;
-_tpm_clean_response1:
-	kzfree(platform_data->tpm_i2c_buffer[0]);
-	platform_data->tpm_i2c_buffer[0] = NULL;
+	return tpm_chip_register(chip);
 _tpm_clean_answer:
-	tpm_remove_hardware(chip->dev);
-end:
-	pr_info("TPM I2C initialisation fail\n");
-	return err;
+	dev_info(chip->pdev, "TPM I2C initialisation fail\n");
+	return ret;
 }
 
 /*
- * tpm_st33_i2c_remove remove the TPM device
- * @param: client, the i2c_client drescription (TPM I2C description).
-		clear_bit(0, &chip->is_open);
+ * tpm_stm_i2c_remove remove the TPM device
+ * @param: client, the i2c_client description (TPM I2C description).
  * @return: 0 in case of success.
  */
-static int tpm_st33_i2c_remove(struct i2c_client *client)
+static int tpm_stm_i2c_remove(struct i2c_client *client)
 {
-	struct tpm_chip *chip = (struct tpm_chip *)i2c_get_clientdata(client);
-	struct st33zp24_platform_data *pin_infos =
-		((struct i2c_client *)TPM_VPRIV(chip))->dev.platform_data;
-
-	if (pin_infos != NULL) {
-		free_irq(pin_infos->io_serirq, chip);
-
-		gpio_free(pin_infos->io_serirq);
-		gpio_free(pin_infos->io_lpcpd);
-
-		tpm_remove_hardware(chip->dev);
+	struct tpm_chip *chip =
+		(struct tpm_chip *) i2c_get_clientdata(client);
 
-		if (pin_infos->tpm_i2c_buffer[1] != NULL) {
-			kzfree(pin_infos->tpm_i2c_buffer[1]);
-			pin_infos->tpm_i2c_buffer[1] = NULL;
-		}
-		if (pin_infos->tpm_i2c_buffer[0] != NULL) {
-			kzfree(pin_infos->tpm_i2c_buffer[0]);
-			pin_infos->tpm_i2c_buffer[0] = NULL;
-		}
-	}
+	if (chip)
+		tpm_chip_unregister(chip);
 
 	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP
 /*
- * tpm_st33_i2c_pm_suspend suspend the TPM device
+ * tpm_stm_i2c_pm_suspend suspend the TPM device
  * @param: client, the i2c_client drescription (TPM I2C description).
  * @param: mesg, the power management message.
  * @return: 0 in case of success.
  */
-static int tpm_st33_i2c_pm_suspend(struct device *dev)
+static int tpm_stm_i2c_pm_suspend(struct device *dev)
 {
 	struct st33zp24_platform_data *pin_infos = dev->platform_data;
 	int ret = 0;
 
-	if (power_mgt) {
+	if (gpio_is_valid(pin_infos->io_lpcpd))
 		gpio_set_value(pin_infos->io_lpcpd, 0);
-	} else {
+	else
 		ret = tpm_pm_suspend(dev);
-	}
+
 	return ret;
-}				/* tpm_st33_i2c_suspend() */
+} /* tpm_stm_i2c_suspend() */
 
 /*
- * tpm_st33_i2c_pm_resume resume the TPM device
+ * tpm_stm_i2c_pm_resume resume the TPM device
  * @param: client, the i2c_client drescription (TPM I2C description).
  * @return: 0 in case of success.
  */
-static int tpm_st33_i2c_pm_resume(struct device *dev)
+static int tpm_stm_i2c_pm_resume(struct device *dev)
 {
 	struct tpm_chip *chip = dev_get_drvdata(dev);
 	struct st33zp24_platform_data *pin_infos = dev->platform_data;
 
 	int ret = 0;
 
-	if (power_mgt) {
+	if (gpio_is_valid(pin_infos->io_lpcpd)) {
 		gpio_set_value(pin_infos->io_lpcpd, 1);
-		ret = wait_for_serirq_timeout(chip,
-					  (chip->ops->status(chip) &
-					  TPM_STS_VALID) == TPM_STS_VALID,
-					  chip->vendor.timeout_b);
+		ret = wait_for_stat(chip,
+				TPM_STS_VALID, chip->vendor.timeout_b,
+				&chip->vendor.read_queue, false);
 	} else {
 		ret = tpm_pm_resume(dev);
 		if (!ret)
 			tpm_do_selftest(chip);
 	}
 	return ret;
-}				/* tpm_st33_i2c_pm_resume() */
+} /* tpm_stm_i2c_pm_resume() */
 #endif
 
-static const struct i2c_device_id tpm_st33_i2c_id[] = {
+static const struct i2c_device_id tpm_stm_i2c_id[] = {
 	{TPM_ST33_I2C, 0},
 	{}
 };
-MODULE_DEVICE_TABLE(i2c, tpm_st33_i2c_id);
-static SIMPLE_DEV_PM_OPS(tpm_st33_i2c_ops, tpm_st33_i2c_pm_suspend,
-	tpm_st33_i2c_pm_resume);
-static struct i2c_driver tpm_st33_i2c_driver = {
+MODULE_DEVICE_TABLE(i2c, tpm_stm_i2c_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id of_st33zp24_i2c_match[] = {
+	{ .compatible = "st,st33zp24-i2c", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, of_st33zp24_i2c_match);
+#endif
+
+static SIMPLE_DEV_PM_OPS(tpm_stm_i2c_ops, tpm_stm_i2c_pm_suspend,
+			 tpm_stm_i2c_pm_resume);
+
+static struct i2c_driver tpm_stm_i2c_driver = {
 	.driver = {
-		   .owner = THIS_MODULE,
-		   .name = TPM_ST33_I2C,
-		   .pm = &tpm_st33_i2c_ops,
-		   },
-	.probe = tpm_st33_i2c_probe,
-	.remove = tpm_st33_i2c_remove,
-	.id_table = tpm_st33_i2c_id
+		.owner = THIS_MODULE,
+		.name = TPM_ST33_I2C,
+		.pm = &tpm_stm_i2c_ops,
+		.of_match_table = of_match_ptr(of_st33zp24_i2c_match),
+	},
+	.probe = tpm_stm_i2c_probe,
+	.remove = tpm_stm_i2c_remove,
+	.id_table = tpm_stm_i2c_id
 };
 
-module_i2c_driver(tpm_st33_i2c_driver);
+module_i2c_driver(tpm_stm_i2c_driver);
 
 MODULE_AUTHOR("Christophe Ricard (tpmsupport@st.com)");
 MODULE_DESCRIPTION("STM TPM I2C ST33 Driver");
-MODULE_VERSION("1.2.0");
+MODULE_VERSION("1.2.1");
 MODULE_LICENSE("GPL");
diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.h b/drivers/char/tpm/tpm_i2c_stm_st33.h
deleted file mode 100644
index 439a43249aa6..000000000000
--- a/drivers/char/tpm/tpm_i2c_stm_st33.h
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
- * Copyright (C) 2009, 2010  STMicroelectronics
- *
- * 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; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that 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.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * STMicroelectronics version 1.2.0, Copyright (C) 2010
- * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
- * This is free software, and you are welcome to redistribute it
- * under certain conditions.
- *
- * @Author: Christophe RICARD tpmsupport@st.com
- *
- * @File: stm_st33_tpm_i2c.h
- *
- * @Date: 09/15/2010
- */
-#ifndef __STM_ST33_TPM_I2C_MAIN_H__
-#define __STM_ST33_TPM_I2C_MAIN_H__
-
-#define TPM_ACCESS			(0x0)
-#define TPM_STS				(0x18)
-#define TPM_HASH_END			(0x20)
-#define TPM_DATA_FIFO			(0x24)
-#define TPM_HASH_DATA			(0x24)
-#define TPM_HASH_START			(0x28)
-#define TPM_INTF_CAPABILITY		(0x14)
-#define TPM_INT_STATUS			(0x10)
-#define TPM_INT_ENABLE			(0x08)
-
-#define TPM_DUMMY_BYTE			0xAA
-#define TPM_WRITE_DIRECTION		0x80
-#define TPM_HEADER_SIZE			10
-#define TPM_BUFSIZE			2048
-
-#define LOCALITY0		0
-
-#define TPM_ST33_I2C			"st33zp24_i2c"
-
-struct st33zp24_platform_data {
-	int io_serirq;
-	int io_lpcpd;
-	struct i2c_client *client;
-	u8 *tpm_i2c_buffer[2]; /* 0 Request 1 Response */
-	struct completion irq_detection;
-	struct mutex lock;
-};
-
-#endif /* __STM_ST33_TPM_I2C_MAIN_H__ */
diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c
index af74c57e5090..0840347e251c 100644
--- a/drivers/char/tpm/tpm_ibmvtpm.c
+++ b/drivers/char/tpm/tpm_ibmvtpm.c
@@ -1,7 +1,7 @@
 /*
  * Copyright (C) 2012 IBM Corporation
  *
- * Author: Ashley Lai <adlai@us.ibm.com>
+ * Author: Ashley Lai <ashleydlai@gmail.com>
  *
  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
  *
@@ -270,8 +270,11 @@ static int ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm)
 static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
 {
 	struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
+	struct tpm_chip *chip = dev_get_drvdata(ibmvtpm->dev);
 	int rc = 0;
 
+	tpm_chip_unregister(chip);
+
 	free_irq(vdev->irq, ibmvtpm);
 
 	do {
@@ -290,8 +293,6 @@ static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
 		kfree(ibmvtpm->rtce_buf);
 	}
 
-	tpm_remove_hardware(ibmvtpm->dev);
-
 	kfree(ibmvtpm);
 
 	return 0;
@@ -307,6 +308,14 @@ static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
 static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev)
 {
 	struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
+
+	/* ibmvtpm initializes at probe time, so the data we are
+	* asking for may not be set yet. Estimate that 4K required
+	* for TCE-mapped buffer in addition to CRQ.
+	*/
+	if (!ibmvtpm)
+		return CRQ_RES_BUF_SIZE + PAGE_SIZE;
+
 	return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size;
 }
 
@@ -555,11 +564,9 @@ static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
 	struct tpm_chip *chip;
 	int rc = -ENOMEM, rc1;
 
-	chip = tpm_register_hardware(dev, &tpm_ibmvtpm);
-	if (!chip) {
-		dev_err(dev, "tpm_register_hardware failed\n");
-		return -ENODEV;
-	}
+	chip = tpmm_chip_alloc(dev, &tpm_ibmvtpm);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
 
 	ibmvtpm = kzalloc(sizeof(struct ibmvtpm_dev), GFP_KERNEL);
 	if (!ibmvtpm) {
@@ -629,7 +636,7 @@ static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
 	if (rc)
 		goto init_irq_cleanup;
 
-	return rc;
+	return tpm_chip_register(chip);
 init_irq_cleanup:
 	do {
 		rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address);
@@ -644,8 +651,6 @@ cleanup:
 		kfree(ibmvtpm);
 	}
 
-	tpm_remove_hardware(dev);
-
 	return rc;
 }
 
diff --git a/drivers/char/tpm/tpm_ibmvtpm.h b/drivers/char/tpm/tpm_ibmvtpm.h
index bd82a791f995..f595f14426bf 100644
--- a/drivers/char/tpm/tpm_ibmvtpm.h
+++ b/drivers/char/tpm/tpm_ibmvtpm.h
@@ -1,7 +1,7 @@
 /*
  * Copyright (C) 2012 IBM Corporation
  *
- * Author: Ashley Lai <adlai@us.ibm.com>
+ * Author: Ashley Lai <ashleydlai@gmail.com>
  *
  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
  *
diff --git a/drivers/char/tpm/tpm_infineon.c b/drivers/char/tpm/tpm_infineon.c
index dc0a2554034e..6d492132ad2b 100644
--- a/drivers/char/tpm/tpm_infineon.c
+++ b/drivers/char/tpm/tpm_infineon.c
@@ -195,9 +195,9 @@ static int wait(struct tpm_chip *chip, int wait_for_bit)
 	}
 	if (i == TPM_MAX_TRIES) {	/* timeout occurs */
 		if (wait_for_bit == STAT_XFE)
-			dev_err(chip->dev, "Timeout in wait(STAT_XFE)\n");
+			dev_err(chip->pdev, "Timeout in wait(STAT_XFE)\n");
 		if (wait_for_bit == STAT_RDA)
-			dev_err(chip->dev, "Timeout in wait(STAT_RDA)\n");
+			dev_err(chip->pdev, "Timeout in wait(STAT_RDA)\n");
 		return -EIO;
 	}
 	return 0;
@@ -220,7 +220,7 @@ static void wait_and_send(struct tpm_chip *chip, u8 sendbyte)
 static void tpm_wtx(struct tpm_chip *chip)
 {
 	number_of_wtx++;
-	dev_info(chip->dev, "Granting WTX (%02d / %02d)\n",
+	dev_info(chip->pdev, "Granting WTX (%02d / %02d)\n",
 		 number_of_wtx, TPM_MAX_WTX_PACKAGES);
 	wait_and_send(chip, TPM_VL_VER);
 	wait_and_send(chip, TPM_CTRL_WTX);
@@ -231,7 +231,7 @@ static void tpm_wtx(struct tpm_chip *chip)
 
 static void tpm_wtx_abort(struct tpm_chip *chip)
 {
-	dev_info(chip->dev, "Aborting WTX\n");
+	dev_info(chip->pdev, "Aborting WTX\n");
 	wait_and_send(chip, TPM_VL_VER);
 	wait_and_send(chip, TPM_CTRL_WTX_ABORT);
 	wait_and_send(chip, 0x00);
@@ -257,7 +257,7 @@ recv_begin:
 	}
 
 	if (buf[0] != TPM_VL_VER) {
-		dev_err(chip->dev,
+		dev_err(chip->pdev,
 			"Wrong transport protocol implementation!\n");
 		return -EIO;
 	}
@@ -272,7 +272,7 @@ recv_begin:
 		}
 
 		if ((size == 0x6D00) && (buf[1] == 0x80)) {
-			dev_err(chip->dev, "Error handling on vendor layer!\n");
+			dev_err(chip->pdev, "Error handling on vendor layer!\n");
 			return -EIO;
 		}
 
@@ -284,7 +284,7 @@ recv_begin:
 	}
 
 	if (buf[1] == TPM_CTRL_WTX) {
-		dev_info(chip->dev, "WTX-package received\n");
+		dev_info(chip->pdev, "WTX-package received\n");
 		if (number_of_wtx < TPM_MAX_WTX_PACKAGES) {
 			tpm_wtx(chip);
 			goto recv_begin;
@@ -295,14 +295,14 @@ recv_begin:
 	}
 
 	if (buf[1] == TPM_CTRL_WTX_ABORT_ACK) {
-		dev_info(chip->dev, "WTX-abort acknowledged\n");
+		dev_info(chip->pdev, "WTX-abort acknowledged\n");
 		return size;
 	}
 
 	if (buf[1] == TPM_CTRL_ERROR) {
-		dev_err(chip->dev, "ERROR-package received:\n");
+		dev_err(chip->pdev, "ERROR-package received:\n");
 		if (buf[4] == TPM_INF_NAK)
-			dev_err(chip->dev,
+			dev_err(chip->pdev,
 				"-> Negative acknowledgement"
 				" - retransmit command!\n");
 		return -EIO;
@@ -321,7 +321,7 @@ static int tpm_inf_send(struct tpm_chip *chip, u8 * buf, size_t count)
 
 	ret = empty_fifo(chip, 1);
 	if (ret) {
-		dev_err(chip->dev, "Timeout while clearing FIFO\n");
+		dev_err(chip->pdev, "Timeout while clearing FIFO\n");
 		return -EIO;
 	}
 
@@ -546,7 +546,14 @@ static int tpm_inf_pnp_probe(struct pnp_dev *dev,
 			 vendorid[0], vendorid[1],
 			 productid[0], productid[1], chipname);
 
-		if (!(chip = tpm_register_hardware(&dev->dev, &tpm_inf)))
+		chip = tpmm_chip_alloc(&dev->dev, &tpm_inf);
+		if (IS_ERR(chip)) {
+			rc = PTR_ERR(chip);
+			goto err_release_region;
+		}
+
+		rc = tpm_chip_register(chip);
+		if (rc)
 			goto err_release_region;
 
 		return 0;
@@ -572,17 +579,15 @@ static void tpm_inf_pnp_remove(struct pnp_dev *dev)
 {
 	struct tpm_chip *chip = pnp_get_drvdata(dev);
 
-	if (chip) {
-		if (tpm_dev.iotype == TPM_INF_IO_PORT) {
-			release_region(tpm_dev.data_regs, tpm_dev.data_size);
-			release_region(tpm_dev.config_port,
-				       tpm_dev.config_size);
-		} else {
-			iounmap(tpm_dev.mem_base);
-			release_mem_region(tpm_dev.map_base, tpm_dev.map_size);
-		}
-		tpm_dev_vendor_release(chip);
-		tpm_remove_hardware(chip->dev);
+	tpm_chip_unregister(chip);
+
+	if (tpm_dev.iotype == TPM_INF_IO_PORT) {
+		release_region(tpm_dev.data_regs, tpm_dev.data_size);
+		release_region(tpm_dev.config_port,
+			       tpm_dev.config_size);
+	} else {
+		iounmap(tpm_dev.mem_base);
+		release_mem_region(tpm_dev.map_base, tpm_dev.map_size);
 	}
 }
 
diff --git a/drivers/char/tpm/tpm_nsc.c b/drivers/char/tpm/tpm_nsc.c
index 4d0a17ea8cde..289389ecef84 100644
--- a/drivers/char/tpm/tpm_nsc.c
+++ b/drivers/char/tpm/tpm_nsc.c
@@ -113,7 +113,7 @@ static int nsc_wait_for_ready(struct tpm_chip *chip)
 	}
 	while (time_before(jiffies, stop));
 
-	dev_info(chip->dev, "wait for ready failed\n");
+	dev_info(chip->pdev, "wait for ready failed\n");
 	return -EBUSY;
 }
 
@@ -129,12 +129,12 @@ static int tpm_nsc_recv(struct tpm_chip *chip, u8 * buf, size_t count)
 		return -EIO;
 
 	if (wait_for_stat(chip, NSC_STATUS_F0, NSC_STATUS_F0, &data) < 0) {
-		dev_err(chip->dev, "F0 timeout\n");
+		dev_err(chip->pdev, "F0 timeout\n");
 		return -EIO;
 	}
 	if ((data =
 	     inb(chip->vendor.base + NSC_DATA)) != NSC_COMMAND_NORMAL) {
-		dev_err(chip->dev, "not in normal mode (0x%x)\n",
+		dev_err(chip->pdev, "not in normal mode (0x%x)\n",
 			data);
 		return -EIO;
 	}
@@ -143,7 +143,7 @@ static int tpm_nsc_recv(struct tpm_chip *chip, u8 * buf, size_t count)
 	for (p = buffer; p < &buffer[count]; p++) {
 		if (wait_for_stat
 		    (chip, NSC_STATUS_OBF, NSC_STATUS_OBF, &data) < 0) {
-			dev_err(chip->dev,
+			dev_err(chip->pdev,
 				"OBF timeout (while reading data)\n");
 			return -EIO;
 		}
@@ -154,11 +154,11 @@ static int tpm_nsc_recv(struct tpm_chip *chip, u8 * buf, size_t count)
 
 	if ((data & NSC_STATUS_F0) == 0 &&
 	(wait_for_stat(chip, NSC_STATUS_F0, NSC_STATUS_F0, &data) < 0)) {
-		dev_err(chip->dev, "F0 not set\n");
+		dev_err(chip->pdev, "F0 not set\n");
 		return -EIO;
 	}
 	if ((data = inb(chip->vendor.base + NSC_DATA)) != NSC_COMMAND_EOC) {
-		dev_err(chip->dev,
+		dev_err(chip->pdev,
 			"expected end of command(0x%x)\n", data);
 		return -EIO;
 	}
@@ -189,19 +189,19 @@ static int tpm_nsc_send(struct tpm_chip *chip, u8 * buf, size_t count)
 		return -EIO;
 
 	if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) {
-		dev_err(chip->dev, "IBF timeout\n");
+		dev_err(chip->pdev, "IBF timeout\n");
 		return -EIO;
 	}
 
 	outb(NSC_COMMAND_NORMAL, chip->vendor.base + NSC_COMMAND);
 	if (wait_for_stat(chip, NSC_STATUS_IBR, NSC_STATUS_IBR, &data) < 0) {
-		dev_err(chip->dev, "IBR timeout\n");
+		dev_err(chip->pdev, "IBR timeout\n");
 		return -EIO;
 	}
 
 	for (i = 0; i < count; i++) {
 		if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) {
-			dev_err(chip->dev,
+			dev_err(chip->pdev,
 				"IBF timeout (while writing data)\n");
 			return -EIO;
 		}
@@ -209,7 +209,7 @@ static int tpm_nsc_send(struct tpm_chip *chip, u8 * buf, size_t count)
 	}
 
 	if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) {
-		dev_err(chip->dev, "IBF timeout\n");
+		dev_err(chip->pdev, "IBF timeout\n");
 		return -EIO;
 	}
 	outb(NSC_COMMAND_EOC, chip->vendor.base + NSC_COMMAND);
@@ -247,10 +247,9 @@ static struct platform_device *pdev = NULL;
 static void tpm_nsc_remove(struct device *dev)
 {
 	struct tpm_chip *chip = dev_get_drvdata(dev);
-	if ( chip ) {
-		release_region(chip->vendor.base, 2);
-		tpm_remove_hardware(chip->dev);
-	}
+
+	tpm_chip_unregister(chip);
+	release_region(chip->vendor.base, 2);
 }
 
 static SIMPLE_DEV_PM_OPS(tpm_nsc_pm, tpm_pm_suspend, tpm_pm_resume);
@@ -307,11 +306,16 @@ static int __init init_nsc(void)
 		goto err_del_dev;
 	}
 
-	if (!(chip = tpm_register_hardware(&pdev->dev, &tpm_nsc))) {
+	chip = tpmm_chip_alloc(&pdev->dev, &tpm_nsc);
+	if (IS_ERR(chip)) {
 		rc = -ENODEV;
 		goto err_rel_reg;
 	}
 
+	rc = tpm_chip_register(chip);
+	if (rc)
+		goto err_rel_reg;
+
 	dev_dbg(&pdev->dev, "NSC TPM detected\n");
 	dev_dbg(&pdev->dev,
 		"NSC LDN 0x%x, SID 0x%x, SRID 0x%x\n",
diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
index 98ba2bd1a355..c002d1bd9caf 100644
--- a/drivers/char/tpm/tpm_of.c
+++ b/drivers/char/tpm/tpm_of.c
@@ -1,7 +1,7 @@
 /*
  * Copyright 2012 IBM Corporation
  *
- * Author: Ashley Lai <adlai@us.ibm.com>
+ * Author: Ashley Lai <ashleydlai@gmail.com>
  *
  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
  *
diff --git a/drivers/char/tpm/tpm_ppi.c b/drivers/char/tpm/tpm_ppi.c
index 61dcc8011ec7..6ca9b5d78144 100644
--- a/drivers/char/tpm/tpm_ppi.c
+++ b/drivers/char/tpm/tpm_ppi.c
@@ -1,3 +1,22 @@
+/*
+ * Copyright (C) 2012-2014 Intel Corporation
+ *
+ * Authors:
+ * Xiaoyan Zhang <xiaoyan.zhang@intel.com>
+ * Jiang Liu <jiang.liu@linux.intel.com>
+ * Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
+ *
+ * Maintained by: <tpmdd-devel@lists.sourceforge.net>
+ *
+ * This file contains implementation of the sysfs interface for PPI.
+ *
+ * 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/acpi.h>
 #include "tpm.h"
 
@@ -12,7 +31,6 @@
 #define PPI_TPM_REQ_MAX		22
 #define PPI_VS_REQ_START	128
 #define PPI_VS_REQ_END		255
-#define PPI_VERSION_LEN		3
 
 static const u8 tpm_ppi_uuid[] = {
 	0xA6, 0xFA, 0xDD, 0x3D,
@@ -22,45 +40,22 @@ static const u8 tpm_ppi_uuid[] = {
 	0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53
 };
 
-static char tpm_ppi_version[PPI_VERSION_LEN + 1];
-static acpi_handle tpm_ppi_handle;
-
-static acpi_status ppi_callback(acpi_handle handle, u32 level, void *context,
-				void **return_value)
-{
-	union acpi_object *obj;
-
-	if (!acpi_check_dsm(handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
-			    1 << TPM_PPI_FN_VERSION))
-		return AE_OK;
-
-	/* Cache version string */
-	obj = acpi_evaluate_dsm_typed(handle, tpm_ppi_uuid,
-				      TPM_PPI_REVISION_ID, TPM_PPI_FN_VERSION,
-				      NULL, ACPI_TYPE_STRING);
-	if (obj) {
-		strlcpy(tpm_ppi_version, obj->string.pointer,
-			PPI_VERSION_LEN + 1);
-		ACPI_FREE(obj);
-	}
-
-	*return_value = handle;
-
-	return AE_CTRL_TERMINATE;
-}
-
 static inline union acpi_object *
-tpm_eval_dsm(int func, acpi_object_type type, union acpi_object *argv4)
+tpm_eval_dsm(acpi_handle ppi_handle, int func, acpi_object_type type,
+	     union acpi_object *argv4)
 {
-	BUG_ON(!tpm_ppi_handle);
-	return acpi_evaluate_dsm_typed(tpm_ppi_handle, tpm_ppi_uuid,
-				       TPM_PPI_REVISION_ID, func, argv4, type);
+	BUG_ON(!ppi_handle);
+	return acpi_evaluate_dsm_typed(ppi_handle, tpm_ppi_uuid,
+				       TPM_PPI_REVISION_ID,
+				       func, argv4, type);
 }
 
 static ssize_t tpm_show_ppi_version(struct device *dev,
 				    struct device_attribute *attr, char *buf)
 {
-	return scnprintf(buf, PAGE_SIZE, "%s\n", tpm_ppi_version);
+	struct tpm_chip *chip = dev_get_drvdata(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%s\n", chip->ppi_version);
 }
 
 static ssize_t tpm_show_ppi_request(struct device *dev,
@@ -68,8 +63,10 @@ static ssize_t tpm_show_ppi_request(struct device *dev,
 {
 	ssize_t size = -EINVAL;
 	union acpi_object *obj;
+	struct tpm_chip *chip = dev_get_drvdata(dev);
 
-	obj = tpm_eval_dsm(TPM_PPI_FN_GETREQ, ACPI_TYPE_PACKAGE, NULL);
+	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETREQ,
+			   ACPI_TYPE_PACKAGE, NULL);
 	if (!obj)
 		return -ENXIO;
 
@@ -103,14 +100,15 @@ static ssize_t tpm_store_ppi_request(struct device *dev,
 	int func = TPM_PPI_FN_SUBREQ;
 	union acpi_object *obj, tmp;
 	union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(1, &tmp);
+	struct tpm_chip *chip = dev_get_drvdata(dev);
 
 	/*
 	 * the function to submit TPM operation request to pre-os environment
 	 * is updated with function index from SUBREQ to SUBREQ2 since PPI
 	 * version 1.1
 	 */
-	if (acpi_check_dsm(tpm_ppi_handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
-			   1 << TPM_PPI_FN_SUBREQ2))
+	if (acpi_check_dsm(chip->acpi_dev_handle, tpm_ppi_uuid,
+			   TPM_PPI_REVISION_ID, 1 << TPM_PPI_FN_SUBREQ2))
 		func = TPM_PPI_FN_SUBREQ2;
 
 	/*
@@ -119,7 +117,7 @@ static ssize_t tpm_store_ppi_request(struct device *dev,
 	 * string/package type. For PPI version 1.0 and 1.1, use buffer type
 	 * for compatibility, and use package type since 1.2 according to spec.
 	 */
-	if (strcmp(tpm_ppi_version, "1.2") < 0) {
+	if (strcmp(chip->ppi_version, "1.2") < 0) {
 		if (sscanf(buf, "%d", &req) != 1)
 			return -EINVAL;
 		argv4.type = ACPI_TYPE_BUFFER;
@@ -131,7 +129,8 @@ static ssize_t tpm_store_ppi_request(struct device *dev,
 			return -EINVAL;
 	}
 
-	obj = tpm_eval_dsm(func, ACPI_TYPE_INTEGER, &argv4);
+	obj = tpm_eval_dsm(chip->acpi_dev_handle, func, ACPI_TYPE_INTEGER,
+			   &argv4);
 	if (!obj) {
 		return -ENXIO;
 	} else {
@@ -157,6 +156,7 @@ static ssize_t tpm_show_ppi_transition_action(struct device *dev,
 		.buffer.length = 0,
 		.buffer.pointer = NULL
 	};
+	struct tpm_chip *chip = dev_get_drvdata(dev);
 
 	static char *info[] = {
 		"None",
@@ -171,9 +171,10 @@ static ssize_t tpm_show_ppi_transition_action(struct device *dev,
 	 * (e.g. Capella with PPI 1.0) need integer/string/buffer type, so for
 	 * compatibility, define params[3].type as buffer, if PPI version < 1.2
 	 */
-	if (strcmp(tpm_ppi_version, "1.2") < 0)
+	if (strcmp(chip->ppi_version, "1.2") < 0)
 		obj = &tmp;
-	obj = tpm_eval_dsm(TPM_PPI_FN_GETACT, ACPI_TYPE_INTEGER, obj);
+	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETACT,
+			   ACPI_TYPE_INTEGER, obj);
 	if (!obj) {
 		return -ENXIO;
 	} else {
@@ -196,8 +197,10 @@ static ssize_t tpm_show_ppi_response(struct device *dev,
 	acpi_status status = -EINVAL;
 	union acpi_object *obj, *ret_obj;
 	u64 req, res;
+	struct tpm_chip *chip = dev_get_drvdata(dev);
 
-	obj = tpm_eval_dsm(TPM_PPI_FN_GETRSP, ACPI_TYPE_PACKAGE, NULL);
+	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETRSP,
+			   ACPI_TYPE_PACKAGE, NULL);
 	if (!obj)
 		return -ENXIO;
 
@@ -248,7 +251,8 @@ cleanup:
 	return status;
 }
 
-static ssize_t show_ppi_operations(char *buf, u32 start, u32 end)
+static ssize_t show_ppi_operations(acpi_handle dev_handle, char *buf, u32 start,
+				   u32 end)
 {
 	int i;
 	u32 ret;
@@ -264,14 +268,15 @@ static ssize_t show_ppi_operations(char *buf, u32 start, u32 end)
 		"User not required",
 	};
 
-	if (!acpi_check_dsm(tpm_ppi_handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
+	if (!acpi_check_dsm(dev_handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
 			    1 << TPM_PPI_FN_GETOPR))
 		return -EPERM;
 
 	tmp.integer.type = ACPI_TYPE_INTEGER;
 	for (i = start; i <= end; i++) {
 		tmp.integer.value = i;
-		obj = tpm_eval_dsm(TPM_PPI_FN_GETOPR, ACPI_TYPE_INTEGER, &argv);
+		obj = tpm_eval_dsm(dev_handle, TPM_PPI_FN_GETOPR,
+				   ACPI_TYPE_INTEGER, &argv);
 		if (!obj) {
 			return -ENOMEM;
 		} else {
@@ -291,14 +296,20 @@ static ssize_t tpm_show_ppi_tcg_operations(struct device *dev,
 					   struct device_attribute *attr,
 					   char *buf)
 {
-	return show_ppi_operations(buf, 0, PPI_TPM_REQ_MAX);
+	struct tpm_chip *chip = dev_get_drvdata(dev);
+
+	return show_ppi_operations(chip->acpi_dev_handle, buf, 0,
+				   PPI_TPM_REQ_MAX);
 }
 
 static ssize_t tpm_show_ppi_vs_operations(struct device *dev,
 					  struct device_attribute *attr,
 					  char *buf)
 {
-	return show_ppi_operations(buf, PPI_VS_REQ_START, PPI_VS_REQ_END);
+	struct tpm_chip *chip = dev_get_drvdata(dev);
+
+	return show_ppi_operations(chip->acpi_dev_handle, buf, PPI_VS_REQ_START,
+				   PPI_VS_REQ_END);
 }
 
 static DEVICE_ATTR(version, S_IRUGO, tpm_show_ppi_version, NULL);
@@ -323,16 +334,38 @@ static struct attribute_group ppi_attr_grp = {
 	.attrs = ppi_attrs
 };
 
-int tpm_add_ppi(struct kobject *parent)
+int tpm_add_ppi(struct tpm_chip *chip)
 {
-	/* Cache TPM ACPI handle and version string */
-	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
-			    ppi_callback, NULL, NULL, &tpm_ppi_handle);
-	return tpm_ppi_handle ? sysfs_create_group(parent, &ppi_attr_grp) : 0;
+	union acpi_object *obj;
+	int rc;
+
+	if (!chip->acpi_dev_handle)
+		return 0;
+
+	if (!acpi_check_dsm(chip->acpi_dev_handle, tpm_ppi_uuid,
+			    TPM_PPI_REVISION_ID, 1 << TPM_PPI_FN_VERSION))
+		return 0;
+
+	/* Cache PPI version string. */
+	obj = acpi_evaluate_dsm_typed(chip->acpi_dev_handle, tpm_ppi_uuid,
+				      TPM_PPI_REVISION_ID, TPM_PPI_FN_VERSION,
+				      NULL, ACPI_TYPE_STRING);
+	if (obj) {
+		strlcpy(chip->ppi_version, obj->string.pointer,
+			sizeof(chip->ppi_version));
+		ACPI_FREE(obj);
+	}
+
+	rc = sysfs_create_group(&chip->pdev->kobj, &ppi_attr_grp);
+
+	if (!rc)
+		chip->flags |= TPM_CHIP_FLAG_PPI;
+
+	return rc;
 }
 
-void tpm_remove_ppi(struct kobject *parent)
+void tpm_remove_ppi(struct tpm_chip *chip)
 {
-	if (tpm_ppi_handle)
-		sysfs_remove_group(parent, &ppi_attr_grp);
+	if (chip->flags & TPM_CHIP_FLAG_PPI)
+		sysfs_remove_group(&chip->pdev->kobj, &ppi_attr_grp);
 }
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 6f1985496112..6725bef7cb96 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2005, 2006 IBM Corporation
+ * Copyright (C) 2014 Intel Corporation
  *
  * Authors:
  * Leendert van Doorn <leendert@watson.ibm.com>
@@ -64,19 +65,30 @@ enum tis_defaults {
 	TIS_LONG_TIMEOUT = 2000,	/* 2 sec */
 };
 
+
+/* Some timeout values are needed before it is known whether the chip is
+ * TPM 1.0 or TPM 2.0.
+ */
+#define TIS_TIMEOUT_A_MAX	max(TIS_SHORT_TIMEOUT, TPM2_TIMEOUT_A)
+#define TIS_TIMEOUT_B_MAX	max(TIS_LONG_TIMEOUT, TPM2_TIMEOUT_B)
+#define TIS_TIMEOUT_C_MAX	max(TIS_SHORT_TIMEOUT, TPM2_TIMEOUT_C)
+#define TIS_TIMEOUT_D_MAX	max(TIS_SHORT_TIMEOUT, TPM2_TIMEOUT_D)
+
 #define	TPM_ACCESS(l)			(0x0000 | ((l) << 12))
 #define	TPM_INT_ENABLE(l)		(0x0008 | ((l) << 12))
 #define	TPM_INT_VECTOR(l)		(0x000C | ((l) << 12))
 #define	TPM_INT_STATUS(l)		(0x0010 | ((l) << 12))
 #define	TPM_INTF_CAPS(l)		(0x0014 | ((l) << 12))
 #define	TPM_STS(l)			(0x0018 | ((l) << 12))
+#define	TPM_STS3(l)			(0x001b | ((l) << 12))
 #define	TPM_DATA_FIFO(l)		(0x0024 | ((l) << 12))
 
 #define	TPM_DID_VID(l)			(0x0F00 | ((l) << 12))
 #define	TPM_RID(l)			(0x0F04 | ((l) << 12))
 
-static LIST_HEAD(tis_chips);
-static DEFINE_MUTEX(tis_lock);
+struct priv_data {
+	bool irq_tested;
+};
 
 #if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
 static int is_itpm(struct pnp_dev *dev)
@@ -241,7 +253,7 @@ static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 	/* read first 10 bytes, including tag, paramsize, and result */
 	if ((size =
 	     recv_data(chip, buf, TPM_HEADER_SIZE)) < TPM_HEADER_SIZE) {
-		dev_err(chip->dev, "Unable to read header\n");
+		dev_err(chip->pdev, "Unable to read header\n");
 		goto out;
 	}
 
@@ -254,7 +266,7 @@ static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 	if ((size +=
 	     recv_data(chip, &buf[TPM_HEADER_SIZE],
 		       expected - TPM_HEADER_SIZE)) < expected) {
-		dev_err(chip->dev, "Unable to read remainder of result\n");
+		dev_err(chip->pdev, "Unable to read remainder of result\n");
 		size = -ETIME;
 		goto out;
 	}
@@ -263,7 +275,7 @@ static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 			  &chip->vendor.int_queue, false);
 	status = tpm_tis_status(chip);
 	if (status & TPM_STS_DATA_AVAIL) {	/* retry? */
-		dev_err(chip->dev, "Error left over data\n");
+		dev_err(chip->pdev, "Error left over data\n");
 		size = -EIO;
 		goto out;
 	}
@@ -338,15 +350,31 @@ out_err:
 	return rc;
 }
 
+static void disable_interrupts(struct tpm_chip *chip)
+{
+	u32 intmask;
+
+	intmask =
+	    ioread32(chip->vendor.iobase +
+		     TPM_INT_ENABLE(chip->vendor.locality));
+	intmask &= ~TPM_GLOBAL_INT_ENABLE;
+	iowrite32(intmask,
+		  chip->vendor.iobase +
+		  TPM_INT_ENABLE(chip->vendor.locality));
+	free_irq(chip->vendor.irq, chip);
+	chip->vendor.irq = 0;
+}
+
 /*
  * If interrupts are used (signaled by an irq set in the vendor structure)
  * tpm.c can skip polling for the data to be available as the interrupt is
  * waited for here
  */
-static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
+static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len)
 {
 	int rc;
 	u32 ordinal;
+	unsigned long dur;
 
 	rc = tpm_tis_send_data(chip, buf, len);
 	if (rc < 0)
@@ -358,9 +386,14 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
 
 	if (chip->vendor.irq) {
 		ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
+
+		if (chip->flags & TPM_CHIP_FLAG_TPM2)
+			dur = tpm2_calc_ordinal_duration(chip, ordinal);
+		else
+			dur = tpm_calc_ordinal_duration(chip, ordinal);
+
 		if (wait_for_tpm_stat
-		    (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
-		     tpm_calc_ordinal_duration(chip, ordinal),
+		    (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, dur,
 		     &chip->vendor.read_queue, false) < 0) {
 			rc = -ETIME;
 			goto out_err;
@@ -373,6 +406,30 @@ out_err:
 	return rc;
 }
 
+static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
+{
+	int rc, irq;
+	struct priv_data *priv = chip->vendor.priv;
+
+	if (!chip->vendor.irq || priv->irq_tested)
+		return tpm_tis_send_main(chip, buf, len);
+
+	/* Verify receipt of the expected IRQ */
+	irq = chip->vendor.irq;
+	chip->vendor.irq = 0;
+	rc = tpm_tis_send_main(chip, buf, len);
+	chip->vendor.irq = irq;
+	if (!priv->irq_tested)
+		msleep(1);
+	if (!priv->irq_tested) {
+		disable_interrupts(chip);
+		dev_err(chip->pdev,
+			FW_BUG "TPM interrupt not working, polling instead\n");
+	}
+	priv->irq_tested = true;
+	return rc;
+}
+
 struct tis_vendor_timeout_override {
 	u32 did_vid;
 	unsigned long timeout_us[4];
@@ -436,7 +493,7 @@ static int probe_itpm(struct tpm_chip *chip)
 
 	rc = tpm_tis_send_data(chip, cmd_getticks, len);
 	if (rc == 0) {
-		dev_info(chip->dev, "Detected an iTPM.\n");
+		dev_info(chip->pdev, "Detected an iTPM.\n");
 		rc = 1;
 	} else
 		rc = -EFAULT;
@@ -505,6 +562,7 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
 	if (interrupt == 0)
 		return IRQ_NONE;
 
+	((struct priv_data *)chip->vendor.priv)->irq_tested = true;
 	if (interrupt & TPM_INTF_DATA_AVAIL_INT)
 		wake_up_interruptible(&chip->vendor.read_queue);
 	if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
@@ -528,27 +586,48 @@ static bool interrupts = true;
 module_param(interrupts, bool, 0444);
 MODULE_PARM_DESC(interrupts, "Enable interrupts");
 
-static int tpm_tis_init(struct device *dev, resource_size_t start,
-			resource_size_t len, unsigned int irq)
+static void tpm_tis_remove(struct tpm_chip *chip)
+{
+	iowrite32(~TPM_GLOBAL_INT_ENABLE &
+		  ioread32(chip->vendor.iobase +
+			   TPM_INT_ENABLE(chip->vendor.
+					  locality)),
+		  chip->vendor.iobase +
+		  TPM_INT_ENABLE(chip->vendor.locality));
+	release_locality(chip, chip->vendor.locality, 1);
+}
+
+static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
+			resource_size_t start, resource_size_t len,
+			unsigned int irq)
 {
 	u32 vendor, intfcaps, intmask;
 	int rc, i, irq_s, irq_e, probe;
 	struct tpm_chip *chip;
+	struct priv_data *priv;
 
-	if (!(chip = tpm_register_hardware(dev, &tpm_tis)))
-		return -ENODEV;
+	priv = devm_kzalloc(dev, sizeof(struct priv_data), GFP_KERNEL);
+	if (priv == NULL)
+		return -ENOMEM;
 
-	chip->vendor.iobase = ioremap(start, len);
-	if (!chip->vendor.iobase) {
-		rc = -EIO;
-		goto out_err;
-	}
+	chip = tpmm_chip_alloc(dev, &tpm_tis);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+
+	chip->vendor.priv = priv;
+#ifdef CONFIG_ACPI
+	chip->acpi_dev_handle = acpi_dev_handle;
+#endif
+
+	chip->vendor.iobase = devm_ioremap(dev, start, len);
+	if (!chip->vendor.iobase)
+		return -EIO;
 
-	/* Default timeouts */
-	chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
-	chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
-	chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
-	chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+	/* Maximum timeouts */
+	chip->vendor.timeout_a = TIS_TIMEOUT_A_MAX;
+	chip->vendor.timeout_b = TIS_TIMEOUT_B_MAX;
+	chip->vendor.timeout_c = TIS_TIMEOUT_C_MAX;
+	chip->vendor.timeout_d = TIS_TIMEOUT_D_MAX;
 
 	if (wait_startup(chip, 0) != 0) {
 		rc = -ENODEV;
@@ -560,11 +639,18 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 		goto out_err;
 	}
 
+	/* Every TPM 2.x command has a higher ordinal than TPM 1.x commands.
+	 * Therefore, we can use an idempotent TPM 2.x command to probe TPM 2.x.
+	 */
+	rc = tpm2_gen_interrupt(chip, true);
+	if (rc == 0 || rc == TPM2_RC_INITIALIZE)
+		chip->flags |= TPM_CHIP_FLAG_TPM2;
+
 	vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
 	chip->vendor.manufacturer_id = vendor;
 
-	dev_info(dev,
-		 "1.2 TPM (device-id 0x%X, rev-id %d)\n",
+	dev_info(dev, "%s TPM (device-id 0x%X, rev-id %d)\n",
+		 (chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2",
 		 vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
 
 	if (!itpm) {
@@ -605,19 +691,6 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 	if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
 		dev_dbg(dev, "\tData Avail Int Support\n");
 
-	/* get the timeouts before testing for irqs */
-	if (tpm_get_timeouts(chip)) {
-		dev_err(dev, "Could not get TPM timeouts and durations\n");
-		rc = -ENODEV;
-		goto out_err;
-	}
-
-	if (tpm_do_selftest(chip)) {
-		dev_err(dev, "TPM self test failed\n");
-		rc = -ENODEV;
-		goto out_err;
-	}
-
 	/* INTERRUPT Setup */
 	init_waitqueue_head(&chip->vendor.read_queue);
 	init_waitqueue_head(&chip->vendor.int_queue);
@@ -649,10 +722,10 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 		for (i = irq_s; i <= irq_e && chip->vendor.irq == 0; i++) {
 			iowrite8(i, chip->vendor.iobase +
 				 TPM_INT_VECTOR(chip->vendor.locality));
-			if (request_irq
-			    (i, tis_int_probe, IRQF_SHARED,
-			     chip->vendor.miscdev.name, chip) != 0) {
-				dev_info(chip->dev,
+			if (devm_request_irq
+			    (dev, i, tis_int_probe, IRQF_SHARED,
+			     chip->devname, chip) != 0) {
+				dev_info(chip->pdev,
 					 "Unable to request irq: %d for probe\n",
 					 i);
 				continue;
@@ -673,7 +746,10 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 			chip->vendor.probed_irq = 0;
 
 			/* Generate Interrupts */
-			tpm_gen_interrupt(chip);
+			if (chip->flags & TPM_CHIP_FLAG_TPM2)
+				tpm2_gen_interrupt(chip, false);
+			else
+				tpm_gen_interrupt(chip);
 
 			chip->vendor.irq = chip->vendor.probed_irq;
 
@@ -690,17 +766,16 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 			iowrite32(intmask,
 				  chip->vendor.iobase +
 				  TPM_INT_ENABLE(chip->vendor.locality));
-			free_irq(i, chip);
 		}
 	}
 	if (chip->vendor.irq) {
 		iowrite8(chip->vendor.irq,
 			 chip->vendor.iobase +
 			 TPM_INT_VECTOR(chip->vendor.locality));
-		if (request_irq
-		    (chip->vendor.irq, tis_int_handler, IRQF_SHARED,
-		     chip->vendor.miscdev.name, chip) != 0) {
-			dev_info(chip->dev,
+		if (devm_request_irq
+		    (dev, chip->vendor.irq, tis_int_handler, IRQF_SHARED,
+		     chip->devname, chip) != 0) {
+			dev_info(chip->pdev,
 				 "Unable to request irq: %d for use\n",
 				 chip->vendor.irq);
 			chip->vendor.irq = 0;
@@ -719,17 +794,49 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 		}
 	}
 
-	INIT_LIST_HEAD(&chip->vendor.list);
-	mutex_lock(&tis_lock);
-	list_add(&chip->vendor.list, &tis_chips);
-	mutex_unlock(&tis_lock);
+	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
+		chip->vendor.timeout_a = msecs_to_jiffies(TPM2_TIMEOUT_A);
+		chip->vendor.timeout_b = msecs_to_jiffies(TPM2_TIMEOUT_B);
+		chip->vendor.timeout_c = msecs_to_jiffies(TPM2_TIMEOUT_C);
+		chip->vendor.timeout_d = msecs_to_jiffies(TPM2_TIMEOUT_D);
+		chip->vendor.duration[TPM_SHORT] =
+			msecs_to_jiffies(TPM2_DURATION_SHORT);
+		chip->vendor.duration[TPM_MEDIUM] =
+			msecs_to_jiffies(TPM2_DURATION_MEDIUM);
+		chip->vendor.duration[TPM_LONG] =
+			msecs_to_jiffies(TPM2_DURATION_LONG);
+
+		rc = tpm2_do_selftest(chip);
+		if (rc == TPM2_RC_INITIALIZE) {
+			dev_warn(dev, "Firmware has not started TPM\n");
+			rc  = tpm2_startup(chip, TPM2_SU_CLEAR);
+			if (!rc)
+				rc = tpm2_do_selftest(chip);
+		}
 
+		if (rc) {
+			dev_err(dev, "TPM self test failed\n");
+			if (rc > 0)
+				rc = -ENODEV;
+			goto out_err;
+		}
+	} else {
+		if (tpm_get_timeouts(chip)) {
+			dev_err(dev, "Could not get TPM timeouts and durations\n");
+			rc = -ENODEV;
+			goto out_err;
+		}
 
-	return 0;
+		if (tpm_do_selftest(chip)) {
+			dev_err(dev, "TPM self test failed\n");
+			rc = -ENODEV;
+			goto out_err;
+		}
+	}
+
+	return tpm_chip_register(chip);
 out_err:
-	if (chip->vendor.iobase)
-		iounmap(chip->vendor.iobase);
-	tpm_remove_hardware(chip->dev);
+	tpm_tis_remove(chip);
 	return rc;
 }
 
@@ -758,14 +865,23 @@ static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
 static int tpm_tis_resume(struct device *dev)
 {
 	struct tpm_chip *chip = dev_get_drvdata(dev);
-	int ret;
+	int ret = 0;
 
 	if (chip->vendor.irq)
 		tpm_tis_reenable_interrupts(chip);
 
-	ret = tpm_pm_resume(dev);
-	if (!ret)
-		tpm_do_selftest(chip);
+	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
+		/* NOP if firmware properly does this. */
+		tpm2_startup(chip, TPM2_SU_STATE);
+
+		ret = tpm2_shutdown(chip, TPM2_SU_STATE);
+		if (!ret)
+			ret = tpm2_do_selftest(chip);
+	} else {
+		ret = tpm_pm_resume(dev);
+		if (!ret)
+			tpm_do_selftest(chip);
+	}
 
 	return ret;
 }
@@ -779,6 +895,7 @@ static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
 {
 	resource_size_t start, len;
 	unsigned int irq = 0;
+	acpi_handle acpi_dev_handle = NULL;
 
 	start = pnp_mem_start(pnp_dev, 0);
 	len = pnp_mem_len(pnp_dev, 0);
@@ -791,7 +908,12 @@ static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
 	if (is_itpm(pnp_dev))
 		itpm = true;
 
-	return tpm_tis_init(&pnp_dev->dev, start, len, irq);
+#ifdef CONFIG_ACPI
+	if (pnp_acpi_device(pnp_dev))
+		acpi_dev_handle = pnp_acpi_device(pnp_dev)->handle;
+#endif
+
+	return tpm_tis_init(&pnp_dev->dev, acpi_dev_handle, start, len, irq);
 }
 
 static struct pnp_device_id tpm_pnp_tbl[] = {
@@ -811,13 +933,10 @@ 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_dev_vendor_release(chip);
-
-	kfree(chip);
+	tpm_chip_unregister(chip);
+	tpm_tis_remove(chip);
 }
 
-
 static struct pnp_driver tis_pnp_driver = {
 	.name = "tpm_tis",
 	.id_table = tpm_pnp_tbl,
@@ -836,7 +955,7 @@ MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
 
 static struct platform_driver tis_drv = {
 	.driver = {
-		.name = "tpm_tis",
+		.name		= "tpm_tis",
 		.pm		= &tpm_tis_pm,
 	},
 };
@@ -862,7 +981,7 @@ static int __init init_tis(void)
 		rc = PTR_ERR(pdev);
 		goto err_dev;
 	}
-	rc = tpm_tis_init(&pdev->dev, TIS_MEM_BASE, TIS_MEM_LEN, 0);
+	rc = tpm_tis_init(&pdev->dev, NULL, TIS_MEM_BASE, TIS_MEM_LEN, 0);
 	if (rc)
 		goto err_init;
 	return 0;
@@ -875,31 +994,16 @@ err_dev:
 
 static void __exit cleanup_tis(void)
 {
-	struct tpm_vendor_specific *i, *j;
 	struct tpm_chip *chip;
-	mutex_lock(&tis_lock);
-	list_for_each_entry_safe(i, j, &tis_chips, list) {
-		chip = to_tpm_chip(i);
-		tpm_remove_hardware(chip->dev);
-		iowrite32(~TPM_GLOBAL_INT_ENABLE &
-			  ioread32(chip->vendor.iobase +
-				   TPM_INT_ENABLE(chip->vendor.
-						  locality)),
-			  chip->vendor.iobase +
-			  TPM_INT_ENABLE(chip->vendor.locality));
-		release_locality(chip, chip->vendor.locality, 1);
-		if (chip->vendor.irq)
-			free_irq(chip->vendor.irq, chip);
-		iounmap(i->iobase);
-		list_del(&i->list);
-	}
-	mutex_unlock(&tis_lock);
 #ifdef CONFIG_PNP
 	if (!force) {
 		pnp_unregister_driver(&tis_pnp_driver);
 		return;
 	}
 #endif
+	chip = dev_get_drvdata(&pdev->dev);
+	tpm_chip_unregister(chip);
+	tpm_tis_remove(chip);
 	platform_device_unregister(pdev);
 	platform_driver_unregister(&tis_drv);
 }
diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c
index 441b44e54226..c3b4f5a5ac10 100644
--- a/drivers/char/tpm/xen-tpmfront.c
+++ b/drivers/char/tpm/xen-tpmfront.c
@@ -175,9 +175,9 @@ static int setup_chip(struct device *dev, struct tpm_private *priv)
 {
 	struct tpm_chip *chip;
 
-	chip = tpm_register_hardware(dev, &tpm_vtpm);
-	if (!chip)
-		return -ENODEV;
+	chip = tpmm_chip_alloc(dev, &tpm_vtpm);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
 
 	init_waitqueue_head(&chip->vendor.read_queue);
 
@@ -286,6 +286,7 @@ static int tpmfront_probe(struct xenbus_device *dev,
 		const struct xenbus_device_id *id)
 {
 	struct tpm_private *priv;
+	struct tpm_chip *chip;
 	int rv;
 
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
@@ -302,21 +303,22 @@ static int tpmfront_probe(struct xenbus_device *dev,
 
 	rv = setup_ring(dev, priv);
 	if (rv) {
-		tpm_remove_hardware(&dev->dev);
+		chip = dev_get_drvdata(&dev->dev);
+		tpm_chip_unregister(chip);
 		ring_free(priv);
 		return rv;
 	}
 
 	tpm_get_timeouts(priv->chip);
 
-	return rv;
+	return tpm_chip_register(priv->chip);
 }
 
 static int tpmfront_remove(struct xenbus_device *dev)
 {
 	struct tpm_chip *chip = dev_get_drvdata(&dev->dev);
 	struct tpm_private *priv = TPM_VPRIV(chip);
-	tpm_remove_hardware(&dev->dev);
+	tpm_chip_unregister(chip);
 	ring_free(priv);
 	TPM_VPRIV(chip) = NULL;
 	return 0;