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/delay.h>
  23 #include <linux/fs.h>
  24 #include <linux/mutex.h>
  25 #include <linux/sched.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/io.h>
  29 #include <linux/tpm.h>
  30
  31 enum tpm_timeout {
  32         TPM_TIMEOUT = 5,        /* msecs */
  33 };
  34
  35 /* TPM addresses */
  36 enum tpm_addr {
  37         TPM_SUPERIO_ADDR = 0x2E,
  38         TPM_ADDR = 0x4E,
  39 };
  40
  41 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
  42                                 char *);
  43 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
  44                                 char *);
  45 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
  46                                 char *);
  47 extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr,
  48                                 char *);
  49 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
  50                                 const char *, size_t);
  51 extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
  52                                 char *);
  53 extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
  54                                 char *);
  55 extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
  56                                 char *);
  57 extern ssize_t tpm_show_temp_deactivated(struct device *,
  58                                          struct device_attribute *attr, char *);
  59 extern ssize_t tpm_show_timeouts(struct device *,
  60                                  struct device_attribute *attr, char *);
  61
  62 struct tpm_chip;
  63
  64 struct tpm_vendor_specific {
  65         const u8 req_complete_mask;
  66         const u8 req_complete_val;
  67         const u8 req_canceled;
  68         void __iomem *iobase;           /* ioremapped address */
  69         unsigned long base;             /* TPM base address */
  70
  71         int irq;
  72
  73         int region_size;
  74         int have_region;
  75
  76         int (*recv) (struct tpm_chip *, u8 *, size_t);
  77         int (*send) (struct tpm_chip *, u8 *, size_t);
  78         void (*cancel) (struct tpm_chip *);
  79         u8 (*status) (struct tpm_chip *);
  80         void (*release) (struct device *);
  81         struct miscdevice miscdev;
  82         struct attribute_group *attr_group;
  83         struct list_head list;
  84         int locality;
  85         unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
  86         unsigned long duration[3]; /* jiffies */
  87
  88         wait_queue_head_t read_queue;
  89         wait_queue_head_t int_queue;
  90 };
  91
  92 struct tpm_chip {
  93         struct device *dev;     /* Device stuff */
  94
  95         int dev_num;            /* /dev/tpm# */
  96         unsigned long is_open;  /* only one allowed */
  97         int time_expired;
  98
  99         /* Data passed to and from the tpm via the read/write calls */
 100         u8 *data_buffer;
 101         atomic_t data_pending;
 102         struct mutex buffer_mutex;
 103
 104         struct timer_list user_read_timer;      /* user needs to claim result */
 105         struct work_struct work;
 106         struct mutex tpm_mutex; /* tpm is processing */
 107
 108         struct tpm_vendor_specific vendor;
 109
 110         struct dentry **bios_dir;
 111
 112         struct list_head list;
 113         void (*release) (struct device *);
 114 };
 115
 116 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
 117
 118 static inline void tpm_chip_put(struct tpm_chip *chip)
 119 {
 120         module_put(chip->dev->driver->owner);
 121 }
 122
 123 static inline int tpm_read_index(int base, int index)
 124 {
 125         outb(index, base);
 126         return inb(base+1) & 0xFF;
 127 }
 128
 129 static inline void tpm_write_index(int base, int index, int value)
 130 {
 131         outb(index, base);
 132         outb(value & 0xFF, base+1);
 133 }
 134 struct tpm_input_header {
 135         __be16  tag;
 136         __be32  length;
 137         __be32  ordinal;
 138 }__attribute__((packed));
 139
 140 struct tpm_output_header {
 141         __be16  tag;
 142         __be32  length;
 143         __be32  return_code;
 144 }__attribute__((packed));
 145
 146 struct  stclear_flags_t {
 147         __be16  tag;
 148         u8      deactivated;
 149         u8      disableForceClear;
 150         u8      physicalPresence;
 151         u8      physicalPresenceLock;
 152         u8      bGlobalLock;
 153 }__attribute__((packed));
 154
 155 struct  tpm_version_t {
 156         u8      Major;
 157         u8      Minor;
 158         u8      revMajor;
 159         u8      revMinor;
 160 }__attribute__((packed));
 161
 162 struct  tpm_version_1_2_t {
 163         __be16  tag;
 164         u8      Major;
 165         u8      Minor;
 166         u8      revMajor;
 167         u8      revMinor;
 168 }__attribute__((packed));
 169
 170 struct  timeout_t {
 171         __be32  a;
 172         __be32  b;
 173         __be32  c;
 174         __be32  d;
 175 }__attribute__((packed));
 176
 177 struct duration_t {
 178         __be32  tpm_short;
 179         __be32  tpm_medium;
 180         __be32  tpm_long;
 181 }__attribute__((packed));
 182
 183 struct permanent_flags_t {
 184         __be16  tag;
 185         u8      disable;
 186         u8      ownership;
 187         u8      deactivated;
 188         u8      readPubek;
 189         u8      disableOwnerClear;
 190         u8      allowMaintenance;
 191         u8      physicalPresenceLifetimeLock;
 192         u8      physicalPresenceHWEnable;
 193         u8      physicalPresenceCMDEnable;
 194         u8      CEKPUsed;
 195         u8      TPMpost;
 196         u8      TPMpostLock;
 197         u8      FIPS;
 198         u8      operator;
 199         u8      enableRevokeEK;
 200         u8      nvLocked;
 201         u8      readSRKPub;
 202         u8      tpmEstablished;
 203         u8      maintenanceDone;
 204         u8      disableFullDALogicInfo;
 205 }__attribute__((packed));
 206
 207 typedef union {
 208         struct  permanent_flags_t perm_flags;
 209         struct  stclear_flags_t stclear_flags;
 210         bool    owned;
 211         __be32  num_pcrs;
 212         struct  tpm_version_t   tpm_version;
 213         struct  tpm_version_1_2_t tpm_version_1_2;
 214         __be32  manufacturer_id;
 215         struct timeout_t  timeout;
 216         struct duration_t duration;
 217 } cap_t;
 218
 219 struct  tpm_getcap_params_in {
 220         __be32  cap;
 221         __be32  subcap_size;
 222         __be32  subcap;
 223 }__attribute__((packed));
 224
 225 struct  tpm_getcap_params_out {
 226         __be32  cap_size;
 227         cap_t   cap;
 228 }__attribute__((packed));
 229
 230 struct  tpm_readpubek_params_out {
 231         u8      algorithm[4];
 232         u8      encscheme[2];
 233         u8      sigscheme[2];
 234         __be32  paramsize;
 235         u8      parameters[12]; /*assuming RSA*/
 236         __be32  keysize;
 237         u8      modulus[256];
 238         u8      checksum[20];
 239 }__attribute__((packed));
 240
 241 typedef union {
 242         struct  tpm_input_header in;
 243         struct  tpm_output_header out;
 244 } tpm_cmd_header;
 245
 246 #define TPM_DIGEST_SIZE 20
 247 struct tpm_pcrread_out {
 248         u8      pcr_result[TPM_DIGEST_SIZE];
 249 }__attribute__((packed));
 250
 251 struct tpm_pcrread_in {
 252         __be32  pcr_idx;
 253 }__attribute__((packed));
 254
 255 struct tpm_pcrextend_in {
 256         __be32  pcr_idx;
 257         u8      hash[TPM_DIGEST_SIZE];
 258 }__attribute__((packed));
 259
 260 typedef union {
 261         struct  tpm_getcap_params_out getcap_out;
 262         struct  tpm_readpubek_params_out readpubek_out;
 263         u8      readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
 264         struct  tpm_getcap_params_in getcap_in;
 265         struct  tpm_pcrread_in  pcrread_in;
 266         struct  tpm_pcrread_out pcrread_out;
 267         struct  tpm_pcrextend_in pcrextend_in;
 268 } tpm_cmd_params;
 269
 270 struct tpm_cmd_t {
 271         tpm_cmd_header  header;
 272         tpm_cmd_params  params;
 273 }__attribute__((packed));
 274
 275 ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
 276
 277 extern void tpm_get_timeouts(struct tpm_chip *);
 278 extern void tpm_gen_interrupt(struct tpm_chip *);
 279 extern void tpm_continue_selftest(struct tpm_chip *);
 280 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
 281 extern struct tpm_chip* tpm_register_hardware(struct device *,
 282                                  const struct tpm_vendor_specific *);
 283 extern int tpm_open(struct inode *, struct file *);
 284 extern int tpm_release(struct inode *, struct file *);
 285 extern void tpm_dev_vendor_release(struct tpm_chip *);
 286 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
 287                          loff_t *);
 288 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
 289 extern void tpm_remove_hardware(struct device *);
 290 extern int tpm_pm_suspend(struct device *, pm_message_t);
 291 extern int tpm_pm_resume(struct device *);
 292
 293 #ifdef CONFIG_ACPI
 294 extern struct dentry ** tpm_bios_log_setup(char *);
 295 extern void tpm_bios_log_teardown(struct dentry **);
 296 #else
 297 static inline struct dentry ** tpm_bios_log_setup(char *name)
 298 {
 299         return NULL;
 300 }
 301 static inline void tpm_bios_log_teardown(struct dentry **dir)
 302 {
 303 }
 304 #endif