94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
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/*
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* Copyright (C) 2004 IBM Corporation
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*
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* Authors:
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* Leendert van Doorn <leendert@watson.ibm.com>
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* Dave Safford <safford@watson.ibm.com>
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* Reiner Sailer <sailer@watson.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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*
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* Maintained by: <tpmdd_devel@lists.sourceforge.net>
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*
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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*/
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#define TPM_TIMEOUT msecs_to_jiffies(5)
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/* TPM addresses */
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#define TPM_ADDR 0x4E
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#define TPM_DATA 0x4F
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struct tpm_chip;
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struct tpm_vendor_specific {
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u8 req_complete_mask;
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u8 req_complete_val;
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u16 base; /* TPM base address */
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int (*recv) (struct tpm_chip *, u8 *, size_t);
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int (*send) (struct tpm_chip *, u8 *, size_t);
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void (*cancel) (struct tpm_chip *);
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struct miscdevice miscdev;
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};
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struct tpm_chip {
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struct pci_dev *pci_dev; /* PCI device stuff */
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int dev_num; /* /dev/tpm# */
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int num_opens; /* only one allowed */
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int time_expired;
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/* Data passed to and from the tpm via the read/write calls */
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u8 *data_buffer;
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atomic_t data_pending;
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struct semaphore buffer_mutex;
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struct timer_list user_read_timer; /* user needs to claim result */
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struct semaphore tpm_mutex; /* tpm is processing */
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struct timer_list device_timer; /* tpm is processing */
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struct semaphore timer_manipulation_mutex;
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struct tpm_vendor_specific *vendor;
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struct list_head list;
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};
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static inline int tpm_read_index(int index)
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{
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outb(index, TPM_ADDR);
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return inb(TPM_DATA) & 0xFF;
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}
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static inline void tpm_write_index(int index, int value)
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{
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outb(index, TPM_ADDR);
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outb(value & 0xFF, TPM_DATA);
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}
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extern void tpm_time_expired(unsigned long);
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extern int tpm_lpc_bus_init(struct pci_dev *, u16);
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extern int tpm_register_hardware(struct pci_dev *,
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struct tpm_vendor_specific *);
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extern int tpm_open(struct inode *, struct file *);
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extern int tpm_release(struct inode *, struct file *);
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extern ssize_t tpm_write(struct file *, const char __user *, size_t,
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loff_t *);
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extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
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extern void __devexit tpm_remove(struct pci_dev *);
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extern int tpm_pm_suspend(struct pci_dev *, u32);
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extern int tpm_pm_resume(struct pci_dev *);
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