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/pci.h>
  23 #include <linux/delay.h>
  24 #include <linux/fs.h>
  25 #include <linux/miscdevice.h>
  26 #include <linux/platform_device.h>
  27
  28 enum tpm_timeout {
  29         TPM_TIMEOUT = 5,        /* msecs */
  30 };
  31
  32 /* TPM addresses */
  33 enum tpm_addr {
  34         TPM_SUPERIO_ADDR = 0x2E,
  35         TPM_ADDR = 0x4E,
  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         u8 req_canceled;
  53         void __iomem *iobase;           /* ioremapped address */
  54         unsigned long base;             /* TPM base address */
  55
  56         int region_size;
  57         int have_region;
  58
  59         int (*recv) (struct tpm_chip *, u8 *, size_t);
  60         int (*send) (struct tpm_chip *, u8 *, size_t);
  61         void (*cancel) (struct tpm_chip *);
  62         u8 (*status) (struct tpm_chip *);
  63         struct miscdevice miscdev;
  64         struct attribute_group *attr_group;
  65 };
  66
  67 struct tpm_chip {
  68         struct device *dev;     /* Device stuff */
  69
  70         int dev_num;            /* /dev/tpm# */
  71         int num_opens;          /* only one allowed */
  72         int time_expired;
  73
  74         /* Data passed to and from the tpm via the read/write calls */
  75         u8 *data_buffer;
  76         atomic_t data_pending;
  77         struct semaphore buffer_mutex;
  78
  79         struct timer_list user_read_timer;      /* user needs to claim result */
  80         struct work_struct work;
  81         struct semaphore tpm_mutex;     /* tpm is processing */
  82
  83         struct tpm_vendor_specific *vendor;
  84
  85         struct list_head list;
  86 };
  87
  88 static inline int tpm_read_index(int base, int index)
  89 {
  90         outb(index, base);
  91         return inb(base+1) & 0xFF;
  92 }
  93
  94 static inline void tpm_write_index(int base, int index, int value)
  95 {
  96         outb(index, base);
  97         outb(value & 0xFF, base+1);
  98 }
  99
 100 extern int tpm_register_hardware(struct device *,
 101                                  struct tpm_vendor_specific *);
 102 extern int tpm_open(struct inode *, struct file *);
 103 extern int tpm_release(struct inode *, struct file *);
 104 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
 105                          loff_t *);
 106 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
 107 extern void tpm_remove_hardware(struct device *);
 108 extern int tpm_pm_suspend(struct device *, pm_message_t);
 109 extern int tpm_pm_resume(struct device *);