--- /dev/null
+/*
+ * Copyright (C) 2012 IBM Corporation
+ *
+ * Author: Ashley Lai <ashleydlai@gmail.com>
+ *
+ * Maintained by: <tpmdd-devel@lists.sourceforge.net>
+ *
+ * Device driver for TCG/TCPA TPM (trusted platform module).
+ * 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/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/slab.h>
+#include <asm/vio.h>
+#include <asm/irq.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/wait.h>
+#include <asm/prom.h>
+
+#include "tpm.h"
+#include "tpm_ibmvtpm.h"
+
+static const char tpm_ibmvtpm_driver_name[] = "tpm_ibmvtpm";
+
+static struct vio_device_id tpm_ibmvtpm_device_table[] = {
+ { "IBM,vtpm", "IBM,vtpm"},
+ { "", "" }
+};
+MODULE_DEVICE_TABLE(vio, tpm_ibmvtpm_device_table);
+
+/**
+ * ibmvtpm_send_crq - Send a CRQ request
+ * @vdev: vio device struct
+ * @w1: first word
+ * @w2: second word
+ *
+ * Return value:
+ * 0 -Sucess
+ * Non-zero - Failure
+ */
+static int ibmvtpm_send_crq(struct vio_dev *vdev, u64 w1, u64 w2)
+{
+ return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, w1, w2);
+}
+
+/**
+ * ibmvtpm_get_data - Retrieve ibm vtpm data
+ * @dev: device struct
+ *
+ * Return value:
+ * vtpm device struct
+ */
+static struct ibmvtpm_dev *ibmvtpm_get_data(const struct device *dev)
+{
+ struct tpm_chip *chip = dev_get_drvdata(dev);
+ if (chip)
+ return (struct ibmvtpm_dev *)TPM_VPRIV(chip);
+ return NULL;
+}
+
+/**
+ * tpm_ibmvtpm_recv - Receive data after send
+ * @chip: tpm chip struct
+ * @buf: buffer to read
+ * count: size of buffer
+ *
+ * Return value:
+ * Number of bytes read
+ */
+static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count)
+{
+ struct ibmvtpm_dev *ibmvtpm;
+ u16 len;
+ int sig;
+
+ ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip);
+
+ if (!ibmvtpm->rtce_buf) {
+ dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
+ return 0;
+ }
+
+ sig = wait_event_interruptible(ibmvtpm->wq, ibmvtpm->res_len != 0);
+ if (sig)
+ return -EINTR;
+
+ len = ibmvtpm->res_len;
+
+ if (count < len) {
+ dev_err(ibmvtpm->dev,
+ "Invalid size in recv: count=%zd, crq_size=%d\n",
+ count, len);
+ return -EIO;
+ }
+
+ spin_lock(&ibmvtpm->rtce_lock);
+ memcpy((void *)buf, (void *)ibmvtpm->rtce_buf, len);
+ memset(ibmvtpm->rtce_buf, 0, len);
+ ibmvtpm->res_len = 0;
+ spin_unlock(&ibmvtpm->rtce_lock);
+ return len;
+}
+
+/**
+ * tpm_ibmvtpm_send - Send tpm request
+ * @chip: tpm chip struct
+ * @buf: buffer contains data to send
+ * count: size of buffer
+ *
+ * Return value:
+ * Number of bytes sent
+ */
+static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
+{
+ struct ibmvtpm_dev *ibmvtpm;
+ struct ibmvtpm_crq crq;
+ __be64 *word = (__be64 *)&crq;
+ int rc;
+
+ ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip);
+
+ if (!ibmvtpm->rtce_buf) {
+ dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
+ return 0;
+ }
+
+ if (count > ibmvtpm->rtce_size) {
+ dev_err(ibmvtpm->dev,
+ "Invalid size in send: count=%zd, rtce_size=%d\n",
+ count, ibmvtpm->rtce_size);
+ return -EIO;
+ }
+
+ spin_lock(&ibmvtpm->rtce_lock);
+ memcpy((void *)ibmvtpm->rtce_buf, (void *)buf, count);
+ crq.valid = (u8)IBMVTPM_VALID_CMD;
+ crq.msg = (u8)VTPM_TPM_COMMAND;
+ crq.len = cpu_to_be16(count);
+ crq.data = cpu_to_be32(ibmvtpm->rtce_dma_handle);
+
+ rc = ibmvtpm_send_crq(ibmvtpm->vdev, be64_to_cpu(word[0]),
+ be64_to_cpu(word[1]));
+ if (rc != H_SUCCESS) {
+ dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc);
+ rc = 0;
+ } else
+ rc = count;
+
+ spin_unlock(&ibmvtpm->rtce_lock);
+ return rc;
+}
+
+static void tpm_ibmvtpm_cancel(struct tpm_chip *chip)
+{
+ return;
+}
+
+static u8 tpm_ibmvtpm_status(struct tpm_chip *chip)
+{
+ return 0;
+}
+
+/**
+ * ibmvtpm_crq_get_rtce_size - Send a CRQ request to get rtce size
+ * @ibmvtpm: vtpm device struct
+ *
+ * Return value:
+ * 0 - Success
+ * Non-zero - Failure
+ */
+static int ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm)
+{
+ struct ibmvtpm_crq crq;
+ u64 *buf = (u64 *) &crq;
+ int rc;
+
+ crq.valid = (u8)IBMVTPM_VALID_CMD;
+ crq.msg = (u8)VTPM_GET_RTCE_BUFFER_SIZE;
+
+ rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
+ cpu_to_be64(buf[1]));
+ if (rc != H_SUCCESS)
+ dev_err(ibmvtpm->dev,
+ "ibmvtpm_crq_get_rtce_size failed rc=%d\n", rc);
+
+ return rc;
+}
+
+/**
+ * ibmvtpm_crq_get_version - Send a CRQ request to get vtpm version
+ * - Note that this is vtpm version and not tpm version
+ * @ibmvtpm: vtpm device struct
+ *
+ * Return value:
+ * 0 - Success
+ * Non-zero - Failure
+ */
+static int ibmvtpm_crq_get_version(struct ibmvtpm_dev *ibmvtpm)
+{
+ struct ibmvtpm_crq crq;
+ u64 *buf = (u64 *) &crq;
+ int rc;
+
+ crq.valid = (u8)IBMVTPM_VALID_CMD;
+ crq.msg = (u8)VTPM_GET_VERSION;
+
+ rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
+ cpu_to_be64(buf[1]));
+ if (rc != H_SUCCESS)
+ dev_err(ibmvtpm->dev,
+ "ibmvtpm_crq_get_version failed rc=%d\n", rc);
+
+ return rc;
+}
+
+/**
+ * ibmvtpm_crq_send_init_complete - Send a CRQ initialize complete message
+ * @ibmvtpm: vtpm device struct
+ *
+ * Return value:
+ * 0 - Success
+ * Non-zero - Failure
+ */
+static int ibmvtpm_crq_send_init_complete(struct ibmvtpm_dev *ibmvtpm)
+{
+ int rc;
+
+ rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_COMP_CMD, 0);
+ if (rc != H_SUCCESS)
+ dev_err(ibmvtpm->dev,
+ "ibmvtpm_crq_send_init_complete failed rc=%d\n", rc);
+
+ return rc;
+}
+
+/**
+ * ibmvtpm_crq_send_init - Send a CRQ initialize message
+ * @ibmvtpm: vtpm device struct
+ *
+ * Return value:
+ * 0 - Success
+ * Non-zero - Failure
+ */
+static int ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm)
+{
+ int rc;
+
+ rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_CMD, 0);
+ if (rc != H_SUCCESS)
+ dev_err(ibmvtpm->dev,
+ "ibmvtpm_crq_send_init failed rc=%d\n", rc);
+
+ return rc;
+}
+
+/**
+ * tpm_ibmvtpm_remove - ibm vtpm remove entry point
+ * @vdev: vio device struct
+ *
+ * Return value:
+ * 0
+ */
+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 {
+ if (rc)
+ msleep(100);
+ rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
+ } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
+
+ dma_unmap_single(ibmvtpm->dev, ibmvtpm->crq_dma_handle,
+ CRQ_RES_BUF_SIZE, DMA_BIDIRECTIONAL);
+ free_page((unsigned long)ibmvtpm->crq_queue.crq_addr);
+
+ if (ibmvtpm->rtce_buf) {
+ dma_unmap_single(ibmvtpm->dev, ibmvtpm->rtce_dma_handle,
+ ibmvtpm->rtce_size, DMA_BIDIRECTIONAL);
+ kfree(ibmvtpm->rtce_buf);
+ }
+
+ kfree(ibmvtpm);
+
+ return 0;
+}
+
+/**
+ * tpm_ibmvtpm_get_desired_dma - Get DMA size needed by this driver
+ * @vdev: vio device struct
+ *
+ * Return value:
+ * Number of bytes the driver needs to DMA map
+ */
+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;
+}
+
+/**
+ * tpm_ibmvtpm_suspend - Suspend
+ * @dev: device struct
+ *
+ * Return value:
+ * 0
+ */
+static int tpm_ibmvtpm_suspend(struct device *dev)
+{
+ struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
+ struct ibmvtpm_crq crq;
+ u64 *buf = (u64 *) &crq;
+ int rc = 0;
+
+ crq.valid = (u8)IBMVTPM_VALID_CMD;
+ crq.msg = (u8)VTPM_PREPARE_TO_SUSPEND;
+
+ rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
+ cpu_to_be64(buf[1]));
+ if (rc != H_SUCCESS)
+ dev_err(ibmvtpm->dev,
+ "tpm_ibmvtpm_suspend failed rc=%d\n", rc);
+
+ return rc;
+}
+
+/**
+ * ibmvtpm_reset_crq - Reset CRQ
+ * @ibmvtpm: ibm vtpm struct
+ *
+ * Return value:
+ * 0 - Success
+ * Non-zero - Failure
+ */
+static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm)
+{
+ int rc = 0;
+
+ do {
+ if (rc)
+ msleep(100);
+ rc = plpar_hcall_norets(H_FREE_CRQ,
+ ibmvtpm->vdev->unit_address);
+ } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
+
+ memset(ibmvtpm->crq_queue.crq_addr, 0, CRQ_RES_BUF_SIZE);
+ ibmvtpm->crq_queue.index = 0;
+
+ return plpar_hcall_norets(H_REG_CRQ, ibmvtpm->vdev->unit_address,
+ ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
+}
+
+/**
+ * tpm_ibmvtpm_resume - Resume from suspend
+ * @dev: device struct
+ *
+ * Return value:
+ * 0
+ */
+static int tpm_ibmvtpm_resume(struct device *dev)
+{
+ struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
+ int rc = 0;
+
+ do {
+ if (rc)
+ msleep(100);
+ rc = plpar_hcall_norets(H_ENABLE_CRQ,
+ ibmvtpm->vdev->unit_address);
+ } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
+
+ if (rc) {
+ dev_err(dev, "Error enabling ibmvtpm rc=%d\n", rc);
+ return rc;
+ }
+
+ rc = vio_enable_interrupts(ibmvtpm->vdev);
+ if (rc) {
+ dev_err(dev, "Error vio_enable_interrupts rc=%d\n", rc);
+ return rc;
+ }
+
+ rc = ibmvtpm_crq_send_init(ibmvtpm);
+ if (rc)
+ dev_err(dev, "Error send_init rc=%d\n", rc);
+
+ return rc;
+}
+
+static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status)
+{
+ return (status == 0);
+}
+
+static const struct tpm_class_ops tpm_ibmvtpm = {
+ .recv = tpm_ibmvtpm_recv,
+ .send = tpm_ibmvtpm_send,
+ .cancel = tpm_ibmvtpm_cancel,
+ .status = tpm_ibmvtpm_status,
+ .req_complete_mask = 0,
+ .req_complete_val = 0,
+ .req_canceled = tpm_ibmvtpm_req_canceled,
+};
+
+static const struct dev_pm_ops tpm_ibmvtpm_pm_ops = {
+ .suspend = tpm_ibmvtpm_suspend,
+ .resume = tpm_ibmvtpm_resume,
+};
+
+/**
+ * ibmvtpm_crq_get_next - Get next responded crq
+ * @ibmvtpm vtpm device struct
+ *
+ * Return value:
+ * vtpm crq pointer
+ */
+static struct ibmvtpm_crq *ibmvtpm_crq_get_next(struct ibmvtpm_dev *ibmvtpm)
+{
+ struct ibmvtpm_crq_queue *crq_q = &ibmvtpm->crq_queue;
+ struct ibmvtpm_crq *crq = &crq_q->crq_addr[crq_q->index];
+
+ if (crq->valid & VTPM_MSG_RES) {
+ if (++crq_q->index == crq_q->num_entry)
+ crq_q->index = 0;
+ smp_rmb();
+ } else
+ crq = NULL;
+ return crq;
+}
+
+/**
+ * ibmvtpm_crq_process - Process responded crq
+ * @crq crq to be processed
+ * @ibmvtpm vtpm device struct
+ *
+ * Return value:
+ * Nothing
+ */
+static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
+ struct ibmvtpm_dev *ibmvtpm)
+{
+ int rc = 0;
+
+ switch (crq->valid) {
+ case VALID_INIT_CRQ:
+ switch (crq->msg) {
+ case INIT_CRQ_RES:
+ dev_info(ibmvtpm->dev, "CRQ initialized\n");
+ rc = ibmvtpm_crq_send_init_complete(ibmvtpm);
+ if (rc)
+ dev_err(ibmvtpm->dev, "Unable to send CRQ init complete rc=%d\n", rc);
+ return;
+ case INIT_CRQ_COMP_RES:
+ dev_info(ibmvtpm->dev,
+ "CRQ initialization completed\n");
+ return;
+ default:
+ dev_err(ibmvtpm->dev, "Unknown crq message type: %d\n", crq->msg);
+ return;
+ }
+ case IBMVTPM_VALID_CMD:
+ switch (crq->msg) {
+ case VTPM_GET_RTCE_BUFFER_SIZE_RES:
+ if (be16_to_cpu(crq->len) <= 0) {
+ dev_err(ibmvtpm->dev, "Invalid rtce size\n");
+ return;
+ }
+ ibmvtpm->rtce_size = be16_to_cpu(crq->len);
+ ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size,
+ GFP_KERNEL);
+ if (!ibmvtpm->rtce_buf) {
+ dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n");
+ return;
+ }
+
+ ibmvtpm->rtce_dma_handle = dma_map_single(ibmvtpm->dev,
+ ibmvtpm->rtce_buf, ibmvtpm->rtce_size,
+ DMA_BIDIRECTIONAL);
+
+ if (dma_mapping_error(ibmvtpm->dev,
+ ibmvtpm->rtce_dma_handle)) {
+ kfree(ibmvtpm->rtce_buf);
+ ibmvtpm->rtce_buf = NULL;
+ dev_err(ibmvtpm->dev, "Failed to dma map rtce buffer\n");
+ }
+
+ return;
+ case VTPM_GET_VERSION_RES:
+ ibmvtpm->vtpm_version = be32_to_cpu(crq->data);
+ return;
+ case VTPM_TPM_COMMAND_RES:
+ /* len of the data in rtce buffer */
+ ibmvtpm->res_len = be16_to_cpu(crq->len);
+ wake_up_interruptible(&ibmvtpm->wq);
+ return;
+ default:
+ return;
+ }
+ }
+ return;
+}
+
+/**
+ * ibmvtpm_interrupt - Interrupt handler
+ * @irq: irq number to handle
+ * @vtpm_instance: vtpm that received interrupt
+ *
+ * Returns:
+ * IRQ_HANDLED
+ **/
+static irqreturn_t ibmvtpm_interrupt(int irq, void *vtpm_instance)
+{
+ struct ibmvtpm_dev *ibmvtpm = (struct ibmvtpm_dev *) vtpm_instance;
+ struct ibmvtpm_crq *crq;
+
+ /* while loop is needed for initial setup (get version and
+ * get rtce_size). There should be only one tpm request at any
+ * given time.
+ */
+ while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) {
+ ibmvtpm_crq_process(crq, ibmvtpm);
+ crq->valid = 0;
+ smp_wmb();
+ }
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * tpm_ibmvtpm_probe - ibm vtpm initialize entry point
+ * @vio_dev: vio device struct
+ * @id: vio device id struct
+ *
+ * Return value:
+ * 0 - Success
+ * Non-zero - Failure
+ */
+static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
+ const struct vio_device_id *id)
+{
+ struct ibmvtpm_dev *ibmvtpm;
+ struct device *dev = &vio_dev->dev;
+ struct ibmvtpm_crq_queue *crq_q;
+ struct tpm_chip *chip;
+ int rc = -ENOMEM, rc1;
+
+ 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) {
+ dev_err(dev, "kzalloc for ibmvtpm failed\n");
+ goto cleanup;
+ }
+
+ crq_q = &ibmvtpm->crq_queue;
+ crq_q->crq_addr = (struct ibmvtpm_crq *)get_zeroed_page(GFP_KERNEL);
+ if (!crq_q->crq_addr) {
+ dev_err(dev, "Unable to allocate memory for crq_addr\n");
+ goto cleanup;
+ }
+
+ crq_q->num_entry = CRQ_RES_BUF_SIZE / sizeof(*crq_q->crq_addr);
+ ibmvtpm->crq_dma_handle = dma_map_single(dev, crq_q->crq_addr,
+ CRQ_RES_BUF_SIZE,
+ DMA_BIDIRECTIONAL);
+
+ if (dma_mapping_error(dev, ibmvtpm->crq_dma_handle)) {
+ dev_err(dev, "dma mapping failed\n");
+ goto cleanup;
+ }
+
+ rc = plpar_hcall_norets(H_REG_CRQ, vio_dev->unit_address,
+ ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
+ if (rc == H_RESOURCE)
+ rc = ibmvtpm_reset_crq(ibmvtpm);
+
+ if (rc) {
+ dev_err(dev, "Unable to register CRQ rc=%d\n", rc);
+ goto reg_crq_cleanup;
+ }
+
+ rc = request_irq(vio_dev->irq, ibmvtpm_interrupt, 0,
+ tpm_ibmvtpm_driver_name, ibmvtpm);
+ if (rc) {
+ dev_err(dev, "Error %d register irq 0x%x\n", rc, vio_dev->irq);
+ goto init_irq_cleanup;
+ }
+
+ rc = vio_enable_interrupts(vio_dev);
+ if (rc) {
+ dev_err(dev, "Error %d enabling interrupts\n", rc);
+ goto init_irq_cleanup;
+ }
+
+ init_waitqueue_head(&ibmvtpm->wq);
+
+ crq_q->index = 0;
+
+ ibmvtpm->dev = dev;
+ ibmvtpm->vdev = vio_dev;
+ TPM_VPRIV(chip) = (void *)ibmvtpm;
+
+ spin_lock_init(&ibmvtpm->rtce_lock);
+
+ rc = ibmvtpm_crq_send_init(ibmvtpm);
+ if (rc)
+ goto init_irq_cleanup;
+
+ rc = ibmvtpm_crq_get_version(ibmvtpm);
+ if (rc)
+ goto init_irq_cleanup;
+
+ rc = ibmvtpm_crq_get_rtce_size(ibmvtpm);
+ if (rc)
+ goto init_irq_cleanup;
+
+ return tpm_chip_register(chip);
+init_irq_cleanup:
+ do {
+ rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address);
+ } while (rc1 == H_BUSY || H_IS_LONG_BUSY(rc1));
+reg_crq_cleanup:
+ dma_unmap_single(dev, ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE,
+ DMA_BIDIRECTIONAL);
+cleanup:
+ if (ibmvtpm) {
+ if (crq_q->crq_addr)
+ free_page((unsigned long)crq_q->crq_addr);
+ kfree(ibmvtpm);
+ }
+
+ return rc;
+}
+
+static struct vio_driver ibmvtpm_driver = {
+ .id_table = tpm_ibmvtpm_device_table,
+ .probe = tpm_ibmvtpm_probe,
+ .remove = tpm_ibmvtpm_remove,
+ .get_desired_dma = tpm_ibmvtpm_get_desired_dma,
+ .name = tpm_ibmvtpm_driver_name,
+ .pm = &tpm_ibmvtpm_pm_ops,
+};
+
+/**
+ * ibmvtpm_module_init - Initialize ibm vtpm module
+ *
+ * Return value:
+ * 0 -Success
+ * Non-zero - Failure
+ */
+static int __init ibmvtpm_module_init(void)
+{
+ return vio_register_driver(&ibmvtpm_driver);
+}
+
+/**
+ * ibmvtpm_module_exit - Teardown ibm vtpm module
+ *
+ * Return value:
+ * Nothing
+ */
+static void __exit ibmvtpm_module_exit(void)
+{
+ vio_unregister_driver(&ibmvtpm_driver);
+}
+
+module_init(ibmvtpm_module_init);
+module_exit(ibmvtpm_module_exit);
+
+MODULE_AUTHOR("adlai@us.ibm.com");
+MODULE_DESCRIPTION("IBM vTPM Driver");
+MODULE_VERSION("1.0");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff