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 enum tpm_timeout {
  29         TPM_TIMEOUT = 5,        /* msecs */
  30 };
  31
  32 /* TPM addresses */
  33 enum tpm_addr {
  34         TPM_ADDR = 0x4E,
  35         TPM_DATA = 0x4F
  36 };
  37
  38 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
  39                                 char *);
  40 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
  41                                 char *);
  42 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
  43                                 char *);
  44 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
  45                                 const char *, size_t);
  46
  47 struct tpm_chip;
  48
  49 struct tpm_vendor_specific {
  50         u8 req_complete_mask;
  51         u8 req_complete_val;
  52         u16 base;               /* TPM base address */
  53
  54         int (*recv) (struct tpm_chip *, u8 *, size_t);
  55         int (*send) (struct tpm_chip *, u8 *, size_t);
  56         void (*cancel) (struct tpm_chip *);
  57         struct miscdevice miscdev;
  58         struct attribute_group *attr_group;
  59 };
  60
  61 struct tpm_chip {
  62         struct pci_dev *pci_dev;        /* PCI device stuff */
  63
  64         int dev_num;            /* /dev/tpm# */
  65         int num_opens;          /* only one allowed */
  66         int time_expired;
  67
  68         /* Data passed to and from the tpm via the read/write calls */
  69         u8 *data_buffer;
  70         atomic_t data_pending;
  71         struct semaphore buffer_mutex;
  72
  73         struct timer_list user_read_timer;      /* user needs to claim result */
  74         struct semaphore tpm_mutex;     /* tpm is processing */
  75
  76         struct tpm_vendor_specific *vendor;
  77
  78         struct list_head list;
  79 };
  80
  81 static inline int tpm_read_index(int index)
  82 {
  83         outb(index, TPM_ADDR);
  84         return inb(TPM_DATA) & 0xFF;
  85 }
  86
  87 static inline void tpm_write_index(int index, int value)
  88 {
  89         outb(index, TPM_ADDR);
  90         outb(value & 0xFF, TPM_DATA);
  91 }
  92
  93 extern int tpm_lpc_bus_init(struct pci_dev *, u16);
  94
  95 extern int tpm_register_hardware(struct pci_dev *,
  96                                  struct tpm_vendor_specific *);
  97 extern int tpm_open(struct inode *, struct file *);
  98 extern int tpm_release(struct inode *, struct file *);
  99 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
 100                          loff_t *);
 101 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
 102 extern void __devexit tpm_remove(struct pci_dev *);
 103 extern int tpm_pm_suspend(struct pci_dev *, pm_message_t);
 104 extern int tpm_pm_resume(struct pci_dev *);