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/* * 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. * */ #include <linux/module.h> #include <linux/version.h> #include <linux/pci.h> #include <linux/delay.h> #include <linux/fs.h> #include <linux/miscdevice.h> #define TPM_TIMEOUT msecs_to_jiffies(5) /* TPM addresses */ #define TPM_ADDR 0x4E #define TPM_DATA 0x4F struct tpm_chip; struct tpm_vendor_specific { u8 req_complete_mask; u8 req_complete_val; u16 base; /* TPM base address */ int (*recv) (struct tpm_chip *, u8 *, size_t); int (*send) (struct tpm_chip *, u8 *, size_t); void (*cancel) (struct tpm_chip *); struct miscdevice miscdev; }; struct tpm_chip { struct pci_dev *pci_dev; /* PCI device stuff */ int dev_num; /* /dev/tpm# */ int num_opens; /* only one allowed */ int time_expired; /* Data passed to and from the tpm via the read/write calls */ u8 *data_buffer; atomic_t data_pending; struct semaphore buffer_mutex; struct timer_list user_read_timer; /* user needs to claim result */ struct semaphore tpm_mutex; /* tpm is processing */ struct timer_list device_timer; /* tpm is processing */ struct semaphore timer_manipulation_mutex; struct tpm_vendor_specific *vendor; struct list_head list; }; static inline int tpm_read_index(int index) { outb(index, TPM_ADDR); return inb(TPM_DATA) & 0xFF; } static inline void tpm_write_index(int index, int value) { outb(index, TPM_ADDR); outb(value & 0xFF, TPM_DATA); } extern void tpm_time_expired(unsigned long); extern int tpm_register_hardware(struct pci_dev *, struct tpm_vendor_specific *); extern int tpm_open(struct inode *, struct file *); extern int tpm_release(struct inode *, struct file *); extern ssize_t tpm_write(struct file *, const char __user *, size_t, loff_t *); extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *); extern void __devexit tpm_remove(struct pci_dev *); extern int tpm_pm_suspend(struct pci_dev *, pm_message_t); extern int tpm_pm_resume(struct pci_dev *); |