| /* |
| * Copyright (C) 2015, 2016 IBM Corporation |
| * Copyright (C) 2016 Intel Corporation |
| * |
| * Author: Stefan Berger <stefanb@us.ibm.com> |
| * |
| * Maintained by: <tpmdd-devel@lists.sourceforge.net> |
| * |
| * Device driver for vTPM (vTPM proxy driver) |
| * |
| * 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/types.h> |
| #include <linux/spinlock.h> |
| #include <linux/uaccess.h> |
| #include <linux/wait.h> |
| #include <linux/miscdevice.h> |
| #include <linux/vtpm_proxy.h> |
| #include <linux/file.h> |
| #include <linux/anon_inodes.h> |
| #include <linux/poll.h> |
| #include <linux/compat.h> |
| |
| #include "tpm.h" |
| |
| #define VTPM_PROXY_REQ_COMPLETE_FLAG BIT(0) |
| |
| struct proxy_dev { |
| struct tpm_chip *chip; |
| |
| u32 flags; /* public API flags */ |
| |
| wait_queue_head_t wq; |
| |
| struct mutex buf_lock; /* protect buffer and flags */ |
| |
| long state; /* internal state */ |
| #define STATE_OPENED_FLAG BIT(0) |
| #define STATE_WAIT_RESPONSE_FLAG BIT(1) /* waiting for emulator response */ |
| #define STATE_REGISTERED_FLAG BIT(2) |
| #define STATE_DRIVER_COMMAND BIT(3) /* sending a driver specific command */ |
| |
| size_t req_len; /* length of queued TPM request */ |
| size_t resp_len; /* length of queued TPM response */ |
| u8 buffer[TPM_BUFSIZE]; /* request/response buffer */ |
| |
| struct work_struct work; /* task that retrieves TPM timeouts */ |
| }; |
| |
| /* all supported flags */ |
| #define VTPM_PROXY_FLAGS_ALL (VTPM_PROXY_FLAG_TPM2) |
| |
| static struct workqueue_struct *workqueue; |
| |
| static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev); |
| |
| /* |
| * Functions related to 'server side' |
| */ |
| |
| /** |
| * vtpm_proxy_fops_read - Read TPM commands on 'server side' |
| * |
| * @filp: file pointer |
| * @buf: read buffer |
| * @count: number of bytes to read |
| * @off: offset |
| * |
| * Return: |
| * Number of bytes read or negative error code |
| */ |
| static ssize_t vtpm_proxy_fops_read(struct file *filp, char __user *buf, |
| size_t count, loff_t *off) |
| { |
| struct proxy_dev *proxy_dev = filp->private_data; |
| size_t len; |
| int sig, rc; |
| |
| sig = wait_event_interruptible(proxy_dev->wq, |
| proxy_dev->req_len != 0 || |
| !(proxy_dev->state & STATE_OPENED_FLAG)); |
| if (sig) |
| return -EINTR; |
| |
| mutex_lock(&proxy_dev->buf_lock); |
| |
| if (!(proxy_dev->state & STATE_OPENED_FLAG)) { |
| mutex_unlock(&proxy_dev->buf_lock); |
| return -EPIPE; |
| } |
| |
| len = proxy_dev->req_len; |
| |
| if (count < len) { |
| mutex_unlock(&proxy_dev->buf_lock); |
| pr_debug("Invalid size in recv: count=%zd, req_len=%zd\n", |
| count, len); |
| return -EIO; |
| } |
| |
| rc = copy_to_user(buf, proxy_dev->buffer, len); |
| memset(proxy_dev->buffer, 0, len); |
| proxy_dev->req_len = 0; |
| |
| if (!rc) |
| proxy_dev->state |= STATE_WAIT_RESPONSE_FLAG; |
| |
| mutex_unlock(&proxy_dev->buf_lock); |
| |
| if (rc) |
| return -EFAULT; |
| |
| return len; |
| } |
| |
| /** |
| * vtpm_proxy_fops_write - Write TPM responses on 'server side' |
| * |
| * @filp: file pointer |
| * @buf: write buffer |
| * @count: number of bytes to write |
| * @off: offset |
| * |
| * Return: |
| * Number of bytes read or negative error value |
| */ |
| static ssize_t vtpm_proxy_fops_write(struct file *filp, const char __user *buf, |
| size_t count, loff_t *off) |
| { |
| struct proxy_dev *proxy_dev = filp->private_data; |
| |
| mutex_lock(&proxy_dev->buf_lock); |
| |
| if (!(proxy_dev->state & STATE_OPENED_FLAG)) { |
| mutex_unlock(&proxy_dev->buf_lock); |
| return -EPIPE; |
| } |
| |
| if (count > sizeof(proxy_dev->buffer) || |
| !(proxy_dev->state & STATE_WAIT_RESPONSE_FLAG)) { |
| mutex_unlock(&proxy_dev->buf_lock); |
| return -EIO; |
| } |
| |
| proxy_dev->state &= ~STATE_WAIT_RESPONSE_FLAG; |
| |
| proxy_dev->req_len = 0; |
| |
| if (copy_from_user(proxy_dev->buffer, buf, count)) { |
| mutex_unlock(&proxy_dev->buf_lock); |
| return -EFAULT; |
| } |
| |
| proxy_dev->resp_len = count; |
| |
| mutex_unlock(&proxy_dev->buf_lock); |
| |
| wake_up_interruptible(&proxy_dev->wq); |
| |
| return count; |
| } |
| |
| /* |
| * vtpm_proxy_fops_poll - Poll status on 'server side' |
| * |
| * @filp: file pointer |
| * @wait: poll table |
| * |
| * Return: Poll flags |
| */ |
| static __poll_t vtpm_proxy_fops_poll(struct file *filp, poll_table *wait) |
| { |
| struct proxy_dev *proxy_dev = filp->private_data; |
| __poll_t ret; |
| |
| poll_wait(filp, &proxy_dev->wq, wait); |
| |
| ret = EPOLLOUT; |
| |
| mutex_lock(&proxy_dev->buf_lock); |
| |
| if (proxy_dev->req_len) |
| ret |= EPOLLIN | EPOLLRDNORM; |
| |
| if (!(proxy_dev->state & STATE_OPENED_FLAG)) |
| ret |= EPOLLHUP; |
| |
| mutex_unlock(&proxy_dev->buf_lock); |
| |
| return ret; |
| } |
| |
| /* |
| * vtpm_proxy_fops_open - Open vTPM device on 'server side' |
| * |
| * @filp: file pointer |
| * |
| * Called when setting up the anonymous file descriptor |
| */ |
| static void vtpm_proxy_fops_open(struct file *filp) |
| { |
| struct proxy_dev *proxy_dev = filp->private_data; |
| |
| proxy_dev->state |= STATE_OPENED_FLAG; |
| } |
| |
| /** |
| * vtpm_proxy_fops_undo_open - counter-part to vtpm_fops_open |
| * Call to undo vtpm_proxy_fops_open |
| * |
| *@proxy_dev: tpm proxy device |
| */ |
| static void vtpm_proxy_fops_undo_open(struct proxy_dev *proxy_dev) |
| { |
| mutex_lock(&proxy_dev->buf_lock); |
| |
| proxy_dev->state &= ~STATE_OPENED_FLAG; |
| |
| mutex_unlock(&proxy_dev->buf_lock); |
| |
| /* no more TPM responses -- wake up anyone waiting for them */ |
| wake_up_interruptible(&proxy_dev->wq); |
| } |
| |
| /* |
| * vtpm_proxy_fops_release - Close 'server side' |
| * |
| * @inode: inode |
| * @filp: file pointer |
| * Return: |
| * Always returns 0. |
| */ |
| static int vtpm_proxy_fops_release(struct inode *inode, struct file *filp) |
| { |
| struct proxy_dev *proxy_dev = filp->private_data; |
| |
| filp->private_data = NULL; |
| |
| vtpm_proxy_delete_device(proxy_dev); |
| |
| return 0; |
| } |
| |
| static const struct file_operations vtpm_proxy_fops = { |
| .owner = THIS_MODULE, |
| .llseek = no_llseek, |
| .read = vtpm_proxy_fops_read, |
| .write = vtpm_proxy_fops_write, |
| .poll = vtpm_proxy_fops_poll, |
| .release = vtpm_proxy_fops_release, |
| }; |
| |
| /* |
| * Functions invoked by the core TPM driver to send TPM commands to |
| * 'server side' and receive responses from there. |
| */ |
| |
| /* |
| * Called when core TPM driver reads TPM responses from 'server side' |
| * |
| * @chip: tpm chip to use |
| * @buf: receive buffer |
| * @count: bytes to read |
| * Return: |
| * Number of TPM response bytes read, negative error value otherwise |
| */ |
| static int vtpm_proxy_tpm_op_recv(struct tpm_chip *chip, u8 *buf, size_t count) |
| { |
| struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); |
| size_t len; |
| |
| /* process gone ? */ |
| mutex_lock(&proxy_dev->buf_lock); |
| |
| if (!(proxy_dev->state & STATE_OPENED_FLAG)) { |
| mutex_unlock(&proxy_dev->buf_lock); |
| return -EPIPE; |
| } |
| |
| len = proxy_dev->resp_len; |
| if (count < len) { |
| dev_err(&chip->dev, |
| "Invalid size in recv: count=%zd, resp_len=%zd\n", |
| count, len); |
| len = -EIO; |
| goto out; |
| } |
| |
| memcpy(buf, proxy_dev->buffer, len); |
| proxy_dev->resp_len = 0; |
| |
| out: |
| mutex_unlock(&proxy_dev->buf_lock); |
| |
| return len; |
| } |
| |
| static int vtpm_proxy_is_driver_command(struct tpm_chip *chip, |
| u8 *buf, size_t count) |
| { |
| struct tpm_header *hdr = (struct tpm_header *)buf; |
| |
| if (count < sizeof(struct tpm_header)) |
| return 0; |
| |
| if (chip->flags & TPM_CHIP_FLAG_TPM2) { |
| switch (be32_to_cpu(hdr->ordinal)) { |
| case TPM2_CC_SET_LOCALITY: |
| return 1; |
| } |
| } else { |
| switch (be32_to_cpu(hdr->ordinal)) { |
| case TPM_ORD_SET_LOCALITY: |
| return 1; |
| } |
| } |
| return 0; |
| } |
| |
| /* |
| * Called when core TPM driver forwards TPM requests to 'server side'. |
| * |
| * @chip: tpm chip to use |
| * @buf: send buffer |
| * @count: bytes to send |
| * |
| * Return: |
| * 0 in case of success, negative error value otherwise. |
| */ |
| static int vtpm_proxy_tpm_op_send(struct tpm_chip *chip, u8 *buf, size_t count) |
| { |
| struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); |
| |
| if (count > sizeof(proxy_dev->buffer)) { |
| dev_err(&chip->dev, |
| "Invalid size in send: count=%zd, buffer size=%zd\n", |
| count, sizeof(proxy_dev->buffer)); |
| return -EIO; |
| } |
| |
| if (!(proxy_dev->state & STATE_DRIVER_COMMAND) && |
| vtpm_proxy_is_driver_command(chip, buf, count)) |
| return -EFAULT; |
| |
| mutex_lock(&proxy_dev->buf_lock); |
| |
| if (!(proxy_dev->state & STATE_OPENED_FLAG)) { |
| mutex_unlock(&proxy_dev->buf_lock); |
| return -EPIPE; |
| } |
| |
| proxy_dev->resp_len = 0; |
| |
| proxy_dev->req_len = count; |
| memcpy(proxy_dev->buffer, buf, count); |
| |
| proxy_dev->state &= ~STATE_WAIT_RESPONSE_FLAG; |
| |
| mutex_unlock(&proxy_dev->buf_lock); |
| |
| wake_up_interruptible(&proxy_dev->wq); |
| |
| return 0; |
| } |
| |
| static void vtpm_proxy_tpm_op_cancel(struct tpm_chip *chip) |
| { |
| /* not supported */ |
| } |
| |
| static u8 vtpm_proxy_tpm_op_status(struct tpm_chip *chip) |
| { |
| struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); |
| |
| if (proxy_dev->resp_len) |
| return VTPM_PROXY_REQ_COMPLETE_FLAG; |
| |
| return 0; |
| } |
| |
| static bool vtpm_proxy_tpm_req_canceled(struct tpm_chip *chip, u8 status) |
| { |
| struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); |
| bool ret; |
| |
| mutex_lock(&proxy_dev->buf_lock); |
| |
| ret = !(proxy_dev->state & STATE_OPENED_FLAG); |
| |
| mutex_unlock(&proxy_dev->buf_lock); |
| |
| return ret; |
| } |
| |
| static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality) |
| { |
| struct tpm_buf buf; |
| int rc; |
| const struct tpm_header *header; |
| struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); |
| |
| if (chip->flags & TPM_CHIP_FLAG_TPM2) |
| rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, |
| TPM2_CC_SET_LOCALITY); |
| else |
| rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, |
| TPM_ORD_SET_LOCALITY); |
| if (rc) |
| return rc; |
| tpm_buf_append_u8(&buf, locality); |
| |
| proxy_dev->state |= STATE_DRIVER_COMMAND; |
| |
| rc = tpm_transmit_cmd(chip, &buf, 0, "attempting to set locality"); |
| |
| proxy_dev->state &= ~STATE_DRIVER_COMMAND; |
| |
| if (rc < 0) { |
| locality = rc; |
| goto out; |
| } |
| |
| header = (const struct tpm_header *)buf.data; |
| rc = be32_to_cpu(header->return_code); |
| if (rc) |
| locality = -1; |
| |
| out: |
| tpm_buf_destroy(&buf); |
| |
| return locality; |
| } |
| |
| static const struct tpm_class_ops vtpm_proxy_tpm_ops = { |
| .flags = TPM_OPS_AUTO_STARTUP, |
| .recv = vtpm_proxy_tpm_op_recv, |
| .send = vtpm_proxy_tpm_op_send, |
| .cancel = vtpm_proxy_tpm_op_cancel, |
| .status = vtpm_proxy_tpm_op_status, |
| .req_complete_mask = VTPM_PROXY_REQ_COMPLETE_FLAG, |
| .req_complete_val = VTPM_PROXY_REQ_COMPLETE_FLAG, |
| .req_canceled = vtpm_proxy_tpm_req_canceled, |
| .request_locality = vtpm_proxy_request_locality, |
| }; |
| |
| /* |
| * Code related to the startup of the TPM 2 and startup of TPM 1.2 + |
| * retrieval of timeouts and durations. |
| */ |
| |
| static void vtpm_proxy_work(struct work_struct *work) |
| { |
| struct proxy_dev *proxy_dev = container_of(work, struct proxy_dev, |
| work); |
| int rc; |
| |
| rc = tpm_chip_register(proxy_dev->chip); |
| if (rc) |
| vtpm_proxy_fops_undo_open(proxy_dev); |
| else |
| proxy_dev->state |= STATE_REGISTERED_FLAG; |
| } |
| |
| /* |
| * vtpm_proxy_work_stop: make sure the work has finished |
| * |
| * This function is useful when user space closed the fd |
| * while the driver still determines timeouts. |
| */ |
| static void vtpm_proxy_work_stop(struct proxy_dev *proxy_dev) |
| { |
| vtpm_proxy_fops_undo_open(proxy_dev); |
| flush_work(&proxy_dev->work); |
| } |
| |
| /* |
| * vtpm_proxy_work_start: Schedule the work for TPM 1.2 & 2 initialization |
| */ |
| static inline void vtpm_proxy_work_start(struct proxy_dev *proxy_dev) |
| { |
| queue_work(workqueue, &proxy_dev->work); |
| } |
| |
| /* |
| * Code related to creation and deletion of device pairs |
| */ |
| static struct proxy_dev *vtpm_proxy_create_proxy_dev(void) |
| { |
| struct proxy_dev *proxy_dev; |
| struct tpm_chip *chip; |
| int err; |
| |
| proxy_dev = kzalloc(sizeof(*proxy_dev), GFP_KERNEL); |
| if (proxy_dev == NULL) |
| return ERR_PTR(-ENOMEM); |
| |
| init_waitqueue_head(&proxy_dev->wq); |
| mutex_init(&proxy_dev->buf_lock); |
| INIT_WORK(&proxy_dev->work, vtpm_proxy_work); |
| |
| chip = tpm_chip_alloc(NULL, &vtpm_proxy_tpm_ops); |
| if (IS_ERR(chip)) { |
| err = PTR_ERR(chip); |
| goto err_proxy_dev_free; |
| } |
| dev_set_drvdata(&chip->dev, proxy_dev); |
| |
| proxy_dev->chip = chip; |
| |
| return proxy_dev; |
| |
| err_proxy_dev_free: |
| kfree(proxy_dev); |
| |
| return ERR_PTR(err); |
| } |
| |
| /* |
| * Undo what has been done in vtpm_create_proxy_dev |
| */ |
| static inline void vtpm_proxy_delete_proxy_dev(struct proxy_dev *proxy_dev) |
| { |
| put_device(&proxy_dev->chip->dev); /* frees chip */ |
| kfree(proxy_dev); |
| } |
| |
| /* |
| * Create a /dev/tpm%d and 'server side' file descriptor pair |
| * |
| * Return: |
| * Returns file pointer on success, an error value otherwise |
| */ |
| static struct file *vtpm_proxy_create_device( |
| struct vtpm_proxy_new_dev *vtpm_new_dev) |
| { |
| struct proxy_dev *proxy_dev; |
| int rc, fd; |
| struct file *file; |
| |
| if (vtpm_new_dev->flags & ~VTPM_PROXY_FLAGS_ALL) |
| return ERR_PTR(-EOPNOTSUPP); |
| |
| proxy_dev = vtpm_proxy_create_proxy_dev(); |
| if (IS_ERR(proxy_dev)) |
| return ERR_CAST(proxy_dev); |
| |
| proxy_dev->flags = vtpm_new_dev->flags; |
| |
| /* setup an anonymous file for the server-side */ |
| fd = get_unused_fd_flags(O_RDWR); |
| if (fd < 0) { |
| rc = fd; |
| goto err_delete_proxy_dev; |
| } |
| |
| file = anon_inode_getfile("[vtpms]", &vtpm_proxy_fops, proxy_dev, |
| O_RDWR); |
| if (IS_ERR(file)) { |
| rc = PTR_ERR(file); |
| goto err_put_unused_fd; |
| } |
| |
| /* from now on we can unwind with put_unused_fd() + fput() */ |
| /* simulate an open() on the server side */ |
| vtpm_proxy_fops_open(file); |
| |
| if (proxy_dev->flags & VTPM_PROXY_FLAG_TPM2) |
| proxy_dev->chip->flags |= TPM_CHIP_FLAG_TPM2; |
| |
| vtpm_proxy_work_start(proxy_dev); |
| |
| vtpm_new_dev->fd = fd; |
| vtpm_new_dev->major = MAJOR(proxy_dev->chip->dev.devt); |
| vtpm_new_dev->minor = MINOR(proxy_dev->chip->dev.devt); |
| vtpm_new_dev->tpm_num = proxy_dev->chip->dev_num; |
| |
| return file; |
| |
| err_put_unused_fd: |
| put_unused_fd(fd); |
| |
| err_delete_proxy_dev: |
| vtpm_proxy_delete_proxy_dev(proxy_dev); |
| |
| return ERR_PTR(rc); |
| } |
| |
| /* |
| * Counter part to vtpm_create_device. |
| */ |
| static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev) |
| { |
| vtpm_proxy_work_stop(proxy_dev); |
| |
| /* |
| * A client may hold the 'ops' lock, so let it know that the server |
| * side shuts down before we try to grab the 'ops' lock when |
| * unregistering the chip. |
| */ |
| vtpm_proxy_fops_undo_open(proxy_dev); |
| |
| if (proxy_dev->state & STATE_REGISTERED_FLAG) |
| tpm_chip_unregister(proxy_dev->chip); |
| |
| vtpm_proxy_delete_proxy_dev(proxy_dev); |
| } |
| |
| /* |
| * Code related to the control device /dev/vtpmx |
| */ |
| |
| /** |
| * vtpmx_ioc_new_dev - handler for the %VTPM_PROXY_IOC_NEW_DEV ioctl |
| * @file: /dev/vtpmx |
| * @ioctl: the ioctl number |
| * @arg: pointer to the struct vtpmx_proxy_new_dev |
| * |
| * Creates an anonymous file that is used by the process acting as a TPM to |
| * communicate with the client processes. The function will also add a new TPM |
| * device through which data is proxied to this TPM acting process. The caller |
| * will be provided with a file descriptor to communicate with the clients and |
| * major and minor numbers for the TPM device. |
| */ |
| static long vtpmx_ioc_new_dev(struct file *file, unsigned int ioctl, |
| unsigned long arg) |
| { |
| void __user *argp = (void __user *)arg; |
| struct vtpm_proxy_new_dev __user *vtpm_new_dev_p; |
| struct vtpm_proxy_new_dev vtpm_new_dev; |
| struct file *vtpm_file; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| vtpm_new_dev_p = argp; |
| |
| if (copy_from_user(&vtpm_new_dev, vtpm_new_dev_p, |
| sizeof(vtpm_new_dev))) |
| return -EFAULT; |
| |
| vtpm_file = vtpm_proxy_create_device(&vtpm_new_dev); |
| if (IS_ERR(vtpm_file)) |
| return PTR_ERR(vtpm_file); |
| |
| if (copy_to_user(vtpm_new_dev_p, &vtpm_new_dev, |
| sizeof(vtpm_new_dev))) { |
| put_unused_fd(vtpm_new_dev.fd); |
| fput(vtpm_file); |
| return -EFAULT; |
| } |
| |
| fd_install(vtpm_new_dev.fd, vtpm_file); |
| return 0; |
| } |
| |
| /* |
| * vtpmx_fops_ioctl: ioctl on /dev/vtpmx |
| * |
| * Return: |
| * Returns 0 on success, a negative error code otherwise. |
| */ |
| static long vtpmx_fops_ioctl(struct file *f, unsigned int ioctl, |
| unsigned long arg) |
| { |
| switch (ioctl) { |
| case VTPM_PROXY_IOC_NEW_DEV: |
| return vtpmx_ioc_new_dev(f, ioctl, arg); |
| default: |
| return -ENOIOCTLCMD; |
| } |
| } |
| |
| #ifdef CONFIG_COMPAT |
| static long vtpmx_fops_compat_ioctl(struct file *f, unsigned int ioctl, |
| unsigned long arg) |
| { |
| return vtpmx_fops_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); |
| } |
| #endif |
| |
| static const struct file_operations vtpmx_fops = { |
| .owner = THIS_MODULE, |
| .unlocked_ioctl = vtpmx_fops_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = vtpmx_fops_compat_ioctl, |
| #endif |
| .llseek = noop_llseek, |
| }; |
| |
| static struct miscdevice vtpmx_miscdev = { |
| .minor = MISC_DYNAMIC_MINOR, |
| .name = "vtpmx", |
| .fops = &vtpmx_fops, |
| }; |
| |
| static int vtpmx_init(void) |
| { |
| return misc_register(&vtpmx_miscdev); |
| } |
| |
| static void vtpmx_cleanup(void) |
| { |
| misc_deregister(&vtpmx_miscdev); |
| } |
| |
| static int __init vtpm_module_init(void) |
| { |
| int rc; |
| |
| rc = vtpmx_init(); |
| if (rc) { |
| pr_err("couldn't create vtpmx device\n"); |
| return rc; |
| } |
| |
| workqueue = create_workqueue("tpm-vtpm"); |
| if (!workqueue) { |
| pr_err("couldn't create workqueue\n"); |
| rc = -ENOMEM; |
| goto err_vtpmx_cleanup; |
| } |
| |
| return 0; |
| |
| err_vtpmx_cleanup: |
| vtpmx_cleanup(); |
| |
| return rc; |
| } |
| |
| static void __exit vtpm_module_exit(void) |
| { |
| destroy_workqueue(workqueue); |
| vtpmx_cleanup(); |
| } |
| |
| module_init(vtpm_module_init); |
| module_exit(vtpm_module_exit); |
| |
| MODULE_AUTHOR("Stefan Berger (stefanb@us.ibm.com)"); |
| MODULE_DESCRIPTION("vTPM Driver"); |
| MODULE_VERSION("0.1"); |
| MODULE_LICENSE("GPL"); |