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Diffstat (limited to 'drivers/char/tpm/tpm.c')
-rw-r--r--drivers/char/tpm/tpm.c606
1 files changed, 0 insertions, 606 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
deleted file mode 100644
index 5a3870477ef..00000000000
--- a/drivers/char/tpm/tpm.c
+++ /dev/null
@@ -1,606 +0,0 @@
-/*
- * Copyright (C) 2004 IBM Corporation
- *
- * Authors:
- * 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>
- *
- * 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.
- *
- * Note, the TPM chip is not interrupt driven (only polling)
- * and can have very long timeouts (minutes!). Hence the unusual
- * calls to msleep.
- *
- */
-
-#include <linux/sched.h>
-#include <linux/poll.h>
-#include <linux/spinlock.h>
-#include "tpm.h"
-
-enum tpm_const {
- TPM_MINOR = 224, /* officially assigned */
- TPM_BUFSIZE = 2048,
- TPM_NUM_DEVICES = 256,
- TPM_NUM_MASK_ENTRIES = TPM_NUM_DEVICES / (8 * sizeof(int))
-};
-
-static LIST_HEAD(tpm_chip_list);
-static DEFINE_SPINLOCK(driver_lock);
-static int dev_mask[TPM_NUM_MASK_ENTRIES];
-
-static void user_reader_timeout(unsigned long ptr)
-{
- struct tpm_chip *chip = (struct tpm_chip *) ptr;
-
- schedule_work(&chip->work);
-}
-
-static void timeout_work(void * ptr)
-{
- struct tpm_chip *chip = ptr;
-
- down(&chip->buffer_mutex);
- atomic_set(&chip->data_pending, 0);
- memset(chip->data_buffer, 0, TPM_BUFSIZE);
- up(&chip->buffer_mutex);
-}
-
-/*
- * Internal kernel interface to transmit TPM commands
- */
-static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
- size_t bufsiz)
-{
- ssize_t rc;
- u32 count;
- unsigned long stop;
-
- count = be32_to_cpu(*((__be32 *) (buf + 2)));
-
- if (count == 0)
- return -ENODATA;
- if (count > bufsiz) {
- dev_err(chip->dev,
- "invalid count value %x %zx \n", count, bufsiz);
- return -E2BIG;
- }
-
- down(&chip->tpm_mutex);
-
- if ((rc = chip->vendor->send(chip, (u8 *) buf, count)) < 0) {
- dev_err(chip->dev,
- "tpm_transmit: tpm_send: error %zd\n", rc);
- goto out;
- }
-
- stop = jiffies + 2 * 60 * HZ;
- do {
- u8 status = chip->vendor->status(chip);
- if ((status & chip->vendor->req_complete_mask) ==
- chip->vendor->req_complete_val) {
- goto out_recv;
- }
-
- if ((status == chip->vendor->req_canceled)) {
- dev_err(chip->dev, "Operation Canceled\n");
- rc = -ECANCELED;
- goto out;
- }
-
- msleep(TPM_TIMEOUT); /* CHECK */
- rmb();
- } while (time_before(jiffies, stop));
-
-
- chip->vendor->cancel(chip);
- dev_err(chip->dev, "Operation Timed out\n");
- rc = -ETIME;
- goto out;
-
-out_recv:
- rc = chip->vendor->recv(chip, (u8 *) buf, bufsiz);
- if (rc < 0)
- dev_err(chip->dev,
- "tpm_transmit: tpm_recv: error %zd\n", rc);
-out:
- up(&chip->tpm_mutex);
- return rc;
-}
-
-#define TPM_DIGEST_SIZE 20
-#define CAP_PCR_RESULT_SIZE 18
-static const u8 cap_pcr[] = {
- 0, 193, /* TPM_TAG_RQU_COMMAND */
- 0, 0, 0, 22, /* length */
- 0, 0, 0, 101, /* TPM_ORD_GetCapability */
- 0, 0, 0, 5,
- 0, 0, 0, 4,
- 0, 0, 1, 1
-};
-
-#define READ_PCR_RESULT_SIZE 30
-static const u8 pcrread[] = {
- 0, 193, /* TPM_TAG_RQU_COMMAND */
- 0, 0, 0, 14, /* length */
- 0, 0, 0, 21, /* TPM_ORD_PcrRead */
- 0, 0, 0, 0 /* PCR index */
-};
-
-ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- u8 data[READ_PCR_RESULT_SIZE];
- ssize_t len;
- int i, j, num_pcrs;
- __be32 index;
- char *str = buf;
-
- struct tpm_chip *chip = dev_get_drvdata(dev);
- if (chip == NULL)
- return -ENODEV;
-
- memcpy(data, cap_pcr, sizeof(cap_pcr));
- if ((len = tpm_transmit(chip, data, sizeof(data)))
- < CAP_PCR_RESULT_SIZE) {
- dev_dbg(chip->dev, "A TPM error (%d) occurred "
- "attempting to determine the number of PCRS\n",
- be32_to_cpu(*((__be32 *) (data + 6))));
- return 0;
- }
-
- num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));
-
- for (i = 0; i < num_pcrs; i++) {
- memcpy(data, pcrread, sizeof(pcrread));
- index = cpu_to_be32(i);
- memcpy(data + 10, &index, 4);
- if ((len = tpm_transmit(chip, data, sizeof(data)))
- < READ_PCR_RESULT_SIZE){
- dev_dbg(chip->dev, "A TPM error (%d) occurred"
- " attempting to read PCR %d of %d\n",
- be32_to_cpu(*((__be32 *) (data + 6))),
- i, num_pcrs);
- goto out;
- }
- str += sprintf(str, "PCR-%02d: ", i);
- for (j = 0; j < TPM_DIGEST_SIZE; j++)
- str += sprintf(str, "%02X ", *(data + 10 + j));
- str += sprintf(str, "\n");
- }
-out:
- return str - buf;
-}
-EXPORT_SYMBOL_GPL(tpm_show_pcrs);
-
-#define READ_PUBEK_RESULT_SIZE 314
-static const u8 readpubek[] = {
- 0, 193, /* TPM_TAG_RQU_COMMAND */
- 0, 0, 0, 30, /* length */
- 0, 0, 0, 124, /* TPM_ORD_ReadPubek */
-};
-
-ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- u8 *data;
- ssize_t len;
- int i, rc;
- char *str = buf;
-
- struct tpm_chip *chip = dev_get_drvdata(dev);
- if (chip == NULL)
- return -ENODEV;
-
- data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- memcpy(data, readpubek, sizeof(readpubek));
-
- if ((len = tpm_transmit(chip, data, READ_PUBEK_RESULT_SIZE)) <
- READ_PUBEK_RESULT_SIZE) {
- dev_dbg(chip->dev, "A TPM error (%d) occurred "
- "attempting to read the PUBEK\n",
- be32_to_cpu(*((__be32 *) (data + 6))));
- rc = 0;
- goto out;
- }
-
- /*
- ignore header 10 bytes
- algorithm 32 bits (1 == RSA )
- encscheme 16 bits
- sigscheme 16 bits
- parameters (RSA 12->bytes: keybit, #primes, expbit)
- keylenbytes 32 bits
- 256 byte modulus
- ignore checksum 20 bytes
- */
-
- str +=
- sprintf(str,
- "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
- "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
- " %02X %02X %02X %02X %02X %02X %02X %02X\n"
- "Modulus length: %d\nModulus: \n",
- data[10], data[11], data[12], data[13], data[14],
- data[15], data[16], data[17], data[22], data[23],
- data[24], data[25], data[26], data[27], data[28],
- data[29], data[30], data[31], data[32], data[33],
- be32_to_cpu(*((__be32 *) (data + 34))));
-
- for (i = 0; i < 256; i++) {
- str += sprintf(str, "%02X ", data[i + 38]);
- if ((i + 1) % 16 == 0)
- str += sprintf(str, "\n");
- }
- rc = str - buf;
-out:
- kfree(data);
- return rc;
-}
-EXPORT_SYMBOL_GPL(tpm_show_pubek);
-
-#define CAP_VER_RESULT_SIZE 18
-static const u8 cap_version[] = {
- 0, 193, /* TPM_TAG_RQU_COMMAND */
- 0, 0, 0, 18, /* length */
- 0, 0, 0, 101, /* TPM_ORD_GetCapability */
- 0, 0, 0, 6,
- 0, 0, 0, 0
-};
-
-#define CAP_MANUFACTURER_RESULT_SIZE 18
-static const u8 cap_manufacturer[] = {
- 0, 193, /* TPM_TAG_RQU_COMMAND */
- 0, 0, 0, 22, /* length */
- 0, 0, 0, 101, /* TPM_ORD_GetCapability */
- 0, 0, 0, 5,
- 0, 0, 0, 4,
- 0, 0, 1, 3
-};
-
-ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- u8 data[sizeof(cap_manufacturer)];
- ssize_t len;
- char *str = buf;
-
- struct tpm_chip *chip = dev_get_drvdata(dev);
- if (chip == NULL)
- return -ENODEV;
-
- memcpy(data, cap_manufacturer, sizeof(cap_manufacturer));
-
- if ((len = tpm_transmit(chip, data, sizeof(data))) <
- CAP_MANUFACTURER_RESULT_SIZE)
- return len;
-
- str += sprintf(str, "Manufacturer: 0x%x\n",
- be32_to_cpu(*((__be32 *) (data + 14))));
-
- memcpy(data, cap_version, sizeof(cap_version));
-
- if ((len = tpm_transmit(chip, data, sizeof(data))) <
- CAP_VER_RESULT_SIZE)
- return len;
-
- str +=
- sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n",
- (int) data[14], (int) data[15], (int) data[16],
- (int) data[17]);
-
- return str - buf;
-}
-EXPORT_SYMBOL_GPL(tpm_show_caps);
-
-ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct tpm_chip *chip = dev_get_drvdata(dev);
- if (chip == NULL)
- return 0;
-
- chip->vendor->cancel(chip);
- return count;
-}
-EXPORT_SYMBOL_GPL(tpm_store_cancel);
-
-/*
- * Device file system interface to the TPM
- */
-int tpm_open(struct inode *inode, struct file *file)
-{
- int rc = 0, minor = iminor(inode);
- struct tpm_chip *chip = NULL, *pos;
-
- spin_lock(&driver_lock);
-
- list_for_each_entry(pos, &tpm_chip_list, list) {
- if (pos->vendor->miscdev.minor == minor) {
- chip = pos;
- break;
- }
- }
-
- if (chip == NULL) {
- rc = -ENODEV;
- goto err_out;
- }
-
- if (chip->num_opens) {
- dev_dbg(chip->dev, "Another process owns this TPM\n");
- rc = -EBUSY;
- goto err_out;
- }
-
- chip->num_opens++;
- get_device(chip->dev);
-
- spin_unlock(&driver_lock);
-
- chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
- if (chip->data_buffer == NULL) {
- chip->num_opens--;
- put_device(chip->dev);
- return -ENOMEM;
- }
-
- atomic_set(&chip->data_pending, 0);
-
- file->private_data = chip;
- return 0;
-
-err_out:
- spin_unlock(&driver_lock);
- return rc;
-}
-EXPORT_SYMBOL_GPL(tpm_open);
-
-int tpm_release(struct inode *inode, struct file *file)
-{
- struct tpm_chip *chip = file->private_data;
-
- spin_lock(&driver_lock);
- file->private_data = NULL;
- chip->num_opens--;
- del_singleshot_timer_sync(&chip->user_read_timer);
- flush_scheduled_work();
- atomic_set(&chip->data_pending, 0);
- put_device(chip->dev);
- kfree(chip->data_buffer);
- spin_unlock(&driver_lock);
- return 0;
-}
-EXPORT_SYMBOL_GPL(tpm_release);
-
-ssize_t tpm_write(struct file *file, const char __user *buf,
- size_t size, loff_t * off)
-{
- struct tpm_chip *chip = file->private_data;
- int in_size = size, out_size;
-
- /* cannot perform a write until the read has cleared
- either via tpm_read or a user_read_timer timeout */
- while (atomic_read(&chip->data_pending) != 0)
- msleep(TPM_TIMEOUT);
-
- down(&chip->buffer_mutex);
-
- if (in_size > TPM_BUFSIZE)
- in_size = TPM_BUFSIZE;
-
- if (copy_from_user
- (chip->data_buffer, (void __user *) buf, in_size)) {
- up(&chip->buffer_mutex);
- return -EFAULT;
- }
-
- /* atomic tpm command send and result receive */
- out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
-
- atomic_set(&chip->data_pending, out_size);
- up(&chip->buffer_mutex);
-
- /* Set a timeout by which the reader must come claim the result */
- mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
-
- return in_size;
-}
-
-EXPORT_SYMBOL_GPL(tpm_write);
-
-ssize_t tpm_read(struct file * file, char __user *buf,
- size_t size, loff_t * off)
-{
- struct tpm_chip *chip = file->private_data;
- int ret_size;
-
- del_singleshot_timer_sync(&chip->user_read_timer);
- flush_scheduled_work();
- ret_size = atomic_read(&chip->data_pending);
- atomic_set(&chip->data_pending, 0);
- if (ret_size > 0) { /* relay data */
- if (size < ret_size)
- ret_size = size;
-
- down(&chip->buffer_mutex);
- if (copy_to_user(buf, chip->data_buffer, ret_size))
- ret_size = -EFAULT;
- up(&chip->buffer_mutex);
- }
-
- return ret_size;
-}
-EXPORT_SYMBOL_GPL(tpm_read);
-
-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(&chip->list);
-
- spin_unlock(&driver_lock);
-
- dev_set_drvdata(dev, NULL);
- misc_deregister(&chip->vendor->miscdev);
- kfree(chip->vendor->miscdev.name);
-
- sysfs_remove_group(&dev->kobj, chip->vendor->attr_group);
- tpm_bios_log_teardown(chip->bios_dir);
-
- dev_mask[chip->dev_num / TPM_NUM_MASK_ENTRIES ] &=
- ~(1 << (chip->dev_num % TPM_NUM_MASK_ENTRIES));
-
- kfree(chip);
-
- put_device(dev);
-}
-EXPORT_SYMBOL_GPL(tpm_remove_hardware);
-
-static u8 savestate[] = {
- 0, 193, /* TPM_TAG_RQU_COMMAND */
- 0, 0, 0, 10, /* blob length (in bytes) */
- 0, 0, 0, 152 /* TPM_ORD_SaveState */
-};
-
-/*
- * We are about to suspend. Save the TPM state
- * so that it can be restored.
- */
-int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
-{
- struct tpm_chip *chip = dev_get_drvdata(dev);
- if (chip == NULL)
- return -ENODEV;
-
- tpm_transmit(chip, savestate, sizeof(savestate));
- return 0;
-}
-EXPORT_SYMBOL_GPL(tpm_pm_suspend);
-
-/*
- * Resume from a power safe. The BIOS already restored
- * the TPM state.
- */
-int tpm_pm_resume(struct device *dev)
-{
- struct tpm_chip *chip = dev_get_drvdata(dev);
-
- if (chip == NULL)
- return -ENODEV;
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(tpm_pm_resume);
-
-/*
- * 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_register_hardware(struct device *dev, struct tpm_vendor_specific *entry)
-{
-#define DEVNAME_SIZE 7
-
- char *devname;
- struct tpm_chip *chip;
- int i, j;
-
- /* Driver specific per-device data */
- chip = kzalloc(sizeof(*chip), GFP_KERNEL);
- if (chip == NULL)
- return -ENOMEM;
-
- init_MUTEX(&chip->buffer_mutex);
- init_MUTEX(&chip->tpm_mutex);
- INIT_LIST_HEAD(&chip->list);
-
- INIT_WORK(&chip->work, timeout_work, chip);
-
- init_timer(&chip->user_read_timer);
- chip->user_read_timer.function = user_reader_timeout;
- chip->user_read_timer.data = (unsigned long) chip;
-
- chip->vendor = entry;
-
- chip->dev_num = -1;
-
- for (i = 0; i < TPM_NUM_MASK_ENTRIES; i++)
- for (j = 0; j < 8 * sizeof(int); j++)
- if ((dev_mask[i] & (1 << j)) == 0) {
- chip->dev_num =
- i * TPM_NUM_MASK_ENTRIES + j;
- dev_mask[i] |= 1 << j;
- goto dev_num_search_complete;
- }
-
-dev_num_search_complete:
- if (chip->dev_num < 0) {
- dev_err(dev, "No available tpm device numbers\n");
- kfree(chip);
- return -ENODEV;
- } else if (chip->dev_num == 0)
- chip->vendor->miscdev.minor = TPM_MINOR;
- else
- chip->vendor->miscdev.minor = MISC_DYNAMIC_MINOR;
-
- devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
- scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
- chip->vendor->miscdev.name = devname;
-
- chip->vendor->miscdev.dev = dev;
- chip->dev = get_device(dev);
-
- if (misc_register(&chip->vendor->miscdev)) {
- dev_err(chip->dev,
- "unable to misc_register %s, minor %d\n",
- chip->vendor->miscdev.name,
- chip->vendor->miscdev.minor);
- put_device(dev);
- kfree(chip);
- dev_mask[i] &= !(1 << j);
- return -ENODEV;
- }
-
- spin_lock(&driver_lock);
-
- dev_set_drvdata(dev, chip);
-
- list_add(&chip->list, &tpm_chip_list);
-
- spin_unlock(&driver_lock);
-
- sysfs_create_group(&dev->kobj, chip->vendor->attr_group);
-
- chip->bios_dir = tpm_bios_log_setup(devname);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(tpm_register_hardware);
-
-MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
-MODULE_DESCRIPTION("TPM Driver");
-MODULE_VERSION("2.0");
-MODULE_LICENSE("GPL");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 21:00:33 +0000