| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2004 IBM Corporation |
| 3 | * |
| 4 | * Authors: |
| 5 | * Leendert van Doorn <leendert@watson.ibm.com> |
| 6 | * Dave Safford <safford@watson.ibm.com> |
| 7 | * Reiner Sailer <sailer@watson.ibm.com> |
| 8 | * Kylene Hall <kjhall@us.ibm.com> |
| 9 | * |
| 10 | * Maintained by: <tpmdd_devel@lists.sourceforge.net> |
| 11 | * |
| 12 | * Device driver for TCG/TCPA TPM (trusted platform module). |
| 13 | * Specifications at www.trustedcomputinggroup.org |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or |
| 16 | * modify it under the terms of the GNU General Public License as |
| 17 | * published by the Free Software Foundation, version 2 of the |
| 18 | * License. |
| 19 | * |
| 20 | */ |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/version.h> |
| 23 | #include <linux/pci.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <linux/fs.h> |
| 26 | #include <linux/miscdevice.h> |
| 27 | |
| 28 | #define TPM_TIMEOUT msecs_to_jiffies(5) |
| 29 | |
| 30 | /* TPM addresses */ |
| 31 | #define TPM_ADDR 0x4E |
| 32 | #define TPM_DATA 0x4F |
| 33 | |
| 34 | struct tpm_chip; |
| 35 | |
| 36 | struct tpm_vendor_specific { |
| 37 | u8 req_complete_mask; |
| 38 | u8 req_complete_val; |
| 39 | u16 base; /* TPM base address */ |
| 40 | |
| 41 | int (*recv) (struct tpm_chip *, u8 *, size_t); |
| 42 | int (*send) (struct tpm_chip *, u8 *, size_t); |
| 43 | void (*cancel) (struct tpm_chip *); |
| 44 | struct miscdevice miscdev; |
| 45 | }; |
| 46 | |
| 47 | struct tpm_chip { |
| 48 | struct pci_dev *pci_dev; /* PCI device stuff */ |
| 49 | |
| 50 | int dev_num; /* /dev/tpm# */ |
| 51 | int num_opens; /* only one allowed */ |
| 52 | int time_expired; |
| 53 | |
| 54 | /* Data passed to and from the tpm via the read/write calls */ |
| 55 | u8 *data_buffer; |
| 56 | atomic_t data_pending; |
| 57 | struct semaphore buffer_mutex; |
| 58 | |
| 59 | struct timer_list user_read_timer; /* user needs to claim result */ |
| 60 | struct semaphore tpm_mutex; /* tpm is processing */ |
| 61 | struct timer_list device_timer; /* tpm is processing */ |
| 62 | struct semaphore timer_manipulation_mutex; |
| 63 | |
| 64 | struct tpm_vendor_specific *vendor; |
| 65 | |
| 66 | struct list_head list; |
| 67 | }; |
| 68 | |
| 69 | static inline int tpm_read_index(int index) |
| 70 | { |
| 71 | outb(index, TPM_ADDR); |
| 72 | return inb(TPM_DATA) & 0xFF; |
| 73 | } |
| 74 | |
| 75 | static inline void tpm_write_index(int index, int value) |
| 76 | { |
| 77 | outb(index, TPM_ADDR); |
| 78 | outb(value & 0xFF, TPM_DATA); |
| 79 | } |
| 80 | |
| 81 | extern void tpm_time_expired(unsigned long); |
| 82 | extern int tpm_lpc_bus_init(struct pci_dev *, u16); |
| 83 | |
| 84 | extern int tpm_register_hardware(struct pci_dev *, |
| 85 | struct tpm_vendor_specific *); |
| 86 | extern int tpm_open(struct inode *, struct file *); |
| 87 | extern int tpm_release(struct inode *, struct file *); |
| 88 | extern ssize_t tpm_write(struct file *, const char __user *, size_t, |
| 89 | loff_t *); |
| 90 | extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *); |
| 91 | extern void __devexit tpm_remove(struct pci_dev *); |
| 92 | extern int tpm_pm_suspend(struct pci_dev *, u32); |
| 93 | extern int tpm_pm_resume(struct pci_dev *); |