drivers/char/tpm/tpm.h

   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 *, pm_message_t);
  93 extern int tpm_pm_resume(struct pci_dev *);