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 #include <linux/io.h>
  28
  29 enum tpm_timeout {
  30         TPM_TIMEOUT = 5,        /* msecs */
  31 };
  32
  33 /* TPM addresses */
  34 enum tpm_addr {
  35         TPM_SUPERIO_ADDR = 0x2E,
  36         TPM_ADDR = 0x4E,
  37 };
  38
  39 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
  40                                 char *);
  41 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
  42                                 char *);
  43 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
  44                                 char *);
  45 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
  46                                 const char *, size_t);
  47
  48 struct tpm_chip;
  49
  50 struct tpm_vendor_specific {
  51         const u8 req_complete_mask;
  52         const u8 req_complete_val;
  53         const u8 req_canceled;
  54         void __iomem *iobase;           /* ioremapped address */
  55         unsigned long base;             /* TPM base address */
  56
  57         int region_size;
  58         int have_region;
  59
  60         int (*recv) (struct tpm_chip *, u8 *, size_t);
  61         int (*send) (struct tpm_chip *, u8 *, size_t);
  62         void (*cancel) (struct tpm_chip *);
  63         u8 (*status) (struct tpm_chip *);
  64         struct miscdevice miscdev;
  65         struct attribute_group *attr_group;
  66 };
  67
  68 struct tpm_chip {
  69         struct device *dev;     /* Device stuff */
  70
  71         int dev_num;            /* /dev/tpm# */
  72         int num_opens;          /* only one allowed */
  73         int time_expired;
  74
  75         /* Data passed to and from the tpm via the read/write calls */
  76         u8 *data_buffer;
  77         atomic_t data_pending;
  78         struct semaphore buffer_mutex;
  79
  80         struct timer_list user_read_timer;      /* user needs to claim result */
  81         struct work_struct work;
  82         struct semaphore tpm_mutex;     /* tpm is processing */
  83
  84         struct tpm_vendor_specific vendor;
  85
  86         struct dentry **bios_dir;
  87
  88         struct list_head list;
  89 };
  90
  91 static inline int tpm_read_index(int base, int index)
  92 {
  93         outb(index, base);
  94         return inb(base+1) & 0xFF;
  95 }
  96
  97 static inline void tpm_write_index(int base, int index, int value)
  98 {
  99         outb(index, base);
 100         outb(value & 0xFF, base+1);
 101 }
 102
 103 extern struct tpm_chip* tpm_register_hardware(struct device *,
 104                                  const struct tpm_vendor_specific *);
 105 extern int tpm_open(struct inode *, struct file *);
 106 extern int tpm_release(struct inode *, struct file *);
 107 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
 108                          loff_t *);
 109 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
 110 extern void tpm_remove_hardware(struct device *);
 111 extern int tpm_pm_suspend(struct device *, pm_message_t);
 112 extern int tpm_pm_resume(struct device *);
 113
 114 #ifdef CONFIG_ACPI
 115 extern struct dentry ** tpm_bios_log_setup(char *);
 116 extern void tpm_bios_log_teardown(struct dentry **);
 117 #else
 118 static inline struct dentry* tpm_bios_log_setup(char *name)
 119 {
 120         return NULL;
 121 }
 122 static inline void tpm_bios_log_teardown(struct dentry **dir)
 123 {
 124 }
 125 #endif