drivers/char/tpm/tpm.c

   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  * Note, the TPM chip is not interrupt driven (only polling)
  21  * and can have very long timeouts (minutes!). Hence the unusual
  22  * calls to msleep.
  23  *
  24  */
  25
  26 #include <linux/poll.h>
  27 #include <linux/spinlock.h>
  28 #include "tpm.h"
  29
  30 enum tpm_const {
  31         TPM_MINOR = 224,        /* officially assigned */
  32         TPM_BUFSIZE = 2048,
  33         TPM_NUM_DEVICES = 256,
  34 };
  35
  36 enum tpm_duration {
  37         TPM_SHORT = 0,
  38         TPM_MEDIUM = 1,
  39         TPM_LONG = 2,
  40         TPM_UNDEFINED,
  41 };
  42
  43 #define TPM_MAX_ORDINAL 243
  44 #define TPM_MAX_PROTECTED_ORDINAL 12
  45 #define TPM_PROTECTED_ORDINAL_MASK 0xFF
  46
  47 static LIST_HEAD(tpm_chip_list);
  48 static DEFINE_SPINLOCK(driver_lock);
  49 static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
  50
  51 /*
  52  * Array with one entry per ordinal defining the maximum amount
  53  * of time the chip could take to return the result.  The ordinal
  54  * designation of short, medium or long is defined in a table in
  55  * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
  56  * values of the SHORT, MEDIUM, and LONG durations are retrieved
  57  * from the chip during initialization with a call to tpm_get_timeouts.
  58  */
  59 static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
  60         TPM_UNDEFINED,          /* 0 */
  61         TPM_UNDEFINED,
  62         TPM_UNDEFINED,
  63         TPM_UNDEFINED,
  64         TPM_UNDEFINED,
  65         TPM_UNDEFINED,          /* 5 */
  66         TPM_UNDEFINED,
  67         TPM_UNDEFINED,
  68         TPM_UNDEFINED,
  69         TPM_UNDEFINED,
  70         TPM_SHORT,              /* 10 */
  71         TPM_SHORT,
  72 };
  73
  74 static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
  75         TPM_UNDEFINED,          /* 0 */
  76         TPM_UNDEFINED,
  77         TPM_UNDEFINED,
  78         TPM_UNDEFINED,
  79         TPM_UNDEFINED,
  80         TPM_UNDEFINED,          /* 5 */
  81         TPM_UNDEFINED,
  82         TPM_UNDEFINED,
  83         TPM_UNDEFINED,
  84         TPM_UNDEFINED,
  85         TPM_SHORT,              /* 10 */
  86         TPM_SHORT,
  87         TPM_MEDIUM,
  88         TPM_LONG,
  89         TPM_LONG,
  90         TPM_MEDIUM,             /* 15 */
  91         TPM_SHORT,
  92         TPM_SHORT,
  93         TPM_MEDIUM,
  94         TPM_LONG,
  95         TPM_SHORT,              /* 20 */
  96         TPM_SHORT,
  97         TPM_MEDIUM,
  98         TPM_MEDIUM,
  99         TPM_MEDIUM,
 100         TPM_SHORT,              /* 25 */
 101         TPM_SHORT,
 102         TPM_MEDIUM,
 103         TPM_SHORT,
 104         TPM_SHORT,
 105         TPM_MEDIUM,             /* 30 */
 106         TPM_LONG,
 107         TPM_MEDIUM,
 108         TPM_SHORT,
 109         TPM_SHORT,
 110         TPM_SHORT,              /* 35 */
 111         TPM_MEDIUM,
 112         TPM_MEDIUM,
 113         TPM_UNDEFINED,
 114         TPM_UNDEFINED,
 115         TPM_MEDIUM,             /* 40 */
 116         TPM_LONG,
 117         TPM_MEDIUM,
 118         TPM_SHORT,
 119         TPM_SHORT,
 120         TPM_SHORT,              /* 45 */
 121         TPM_SHORT,
 122         TPM_SHORT,
 123         TPM_SHORT,
 124         TPM_LONG,
 125         TPM_MEDIUM,             /* 50 */
 126         TPM_MEDIUM,
 127         TPM_UNDEFINED,
 128         TPM_UNDEFINED,
 129         TPM_UNDEFINED,
 130         TPM_UNDEFINED,          /* 55 */
 131         TPM_UNDEFINED,
 132         TPM_UNDEFINED,
 133         TPM_UNDEFINED,
 134         TPM_UNDEFINED,
 135         TPM_MEDIUM,             /* 60 */
 136         TPM_MEDIUM,
 137         TPM_MEDIUM,
 138         TPM_SHORT,
 139         TPM_SHORT,
 140         TPM_MEDIUM,             /* 65 */
 141         TPM_UNDEFINED,
 142         TPM_UNDEFINED,
 143         TPM_UNDEFINED,
 144         TPM_UNDEFINED,
 145         TPM_SHORT,              /* 70 */
 146         TPM_SHORT,
 147         TPM_UNDEFINED,
 148         TPM_UNDEFINED,
 149         TPM_UNDEFINED,
 150         TPM_UNDEFINED,          /* 75 */
 151         TPM_UNDEFINED,
 152         TPM_UNDEFINED,
 153         TPM_UNDEFINED,
 154         TPM_UNDEFINED,
 155         TPM_LONG,               /* 80 */
 156         TPM_UNDEFINED,
 157         TPM_MEDIUM,
 158         TPM_LONG,
 159         TPM_SHORT,
 160         TPM_UNDEFINED,          /* 85 */
 161         TPM_UNDEFINED,
 162         TPM_UNDEFINED,
 163         TPM_UNDEFINED,
 164         TPM_UNDEFINED,
 165         TPM_SHORT,              /* 90 */
 166         TPM_SHORT,
 167         TPM_SHORT,
 168         TPM_SHORT,
 169         TPM_SHORT,
 170         TPM_UNDEFINED,          /* 95 */
 171         TPM_UNDEFINED,
 172         TPM_UNDEFINED,
 173         TPM_UNDEFINED,
 174         TPM_UNDEFINED,
 175         TPM_MEDIUM,             /* 100 */
 176         TPM_SHORT,
 177         TPM_SHORT,
 178         TPM_UNDEFINED,
 179         TPM_UNDEFINED,
 180         TPM_UNDEFINED,          /* 105 */
 181         TPM_UNDEFINED,
 182         TPM_UNDEFINED,
 183         TPM_UNDEFINED,
 184         TPM_UNDEFINED,
 185         TPM_SHORT,              /* 110 */
 186         TPM_SHORT,
 187         TPM_SHORT,
 188         TPM_SHORT,
 189         TPM_SHORT,
 190         TPM_SHORT,              /* 115 */
 191         TPM_SHORT,
 192         TPM_SHORT,
 193         TPM_UNDEFINED,
 194         TPM_UNDEFINED,
 195         TPM_LONG,               /* 120 */
 196         TPM_LONG,
 197         TPM_MEDIUM,
 198         TPM_UNDEFINED,
 199         TPM_SHORT,
 200         TPM_SHORT,              /* 125 */
 201         TPM_SHORT,
 202         TPM_LONG,
 203         TPM_SHORT,
 204         TPM_SHORT,
 205         TPM_SHORT,              /* 130 */
 206         TPM_MEDIUM,
 207         TPM_UNDEFINED,
 208         TPM_SHORT,
 209         TPM_MEDIUM,
 210         TPM_UNDEFINED,          /* 135 */
 211         TPM_UNDEFINED,
 212         TPM_UNDEFINED,
 213         TPM_UNDEFINED,
 214         TPM_UNDEFINED,
 215         TPM_SHORT,              /* 140 */
 216         TPM_SHORT,
 217         TPM_UNDEFINED,
 218         TPM_UNDEFINED,
 219         TPM_UNDEFINED,
 220         TPM_UNDEFINED,          /* 145 */
 221         TPM_UNDEFINED,
 222         TPM_UNDEFINED,
 223         TPM_UNDEFINED,
 224         TPM_UNDEFINED,
 225         TPM_SHORT,              /* 150 */
 226         TPM_MEDIUM,
 227         TPM_MEDIUM,
 228         TPM_SHORT,
 229         TPM_SHORT,
 230         TPM_UNDEFINED,          /* 155 */
 231         TPM_UNDEFINED,
 232         TPM_UNDEFINED,
 233         TPM_UNDEFINED,
 234         TPM_UNDEFINED,
 235         TPM_SHORT,              /* 160 */
 236         TPM_SHORT,
 237         TPM_SHORT,
 238         TPM_SHORT,
 239         TPM_UNDEFINED,
 240         TPM_UNDEFINED,          /* 165 */
 241         TPM_UNDEFINED,
 242         TPM_UNDEFINED,
 243         TPM_UNDEFINED,
 244         TPM_UNDEFINED,
 245         TPM_LONG,               /* 170 */
 246         TPM_UNDEFINED,
 247         TPM_UNDEFINED,
 248         TPM_UNDEFINED,
 249         TPM_UNDEFINED,
 250         TPM_UNDEFINED,          /* 175 */
 251         TPM_UNDEFINED,
 252         TPM_UNDEFINED,
 253         TPM_UNDEFINED,
 254         TPM_UNDEFINED,
 255         TPM_MEDIUM,             /* 180 */
 256         TPM_SHORT,
 257         TPM_MEDIUM,
 258         TPM_MEDIUM,
 259         TPM_MEDIUM,
 260         TPM_MEDIUM,             /* 185 */
 261         TPM_SHORT,
 262         TPM_UNDEFINED,
 263         TPM_UNDEFINED,
 264         TPM_UNDEFINED,
 265         TPM_UNDEFINED,          /* 190 */
 266         TPM_UNDEFINED,
 267         TPM_UNDEFINED,
 268         TPM_UNDEFINED,
 269         TPM_UNDEFINED,
 270         TPM_UNDEFINED,          /* 195 */
 271         TPM_UNDEFINED,
 272         TPM_UNDEFINED,
 273         TPM_UNDEFINED,
 274         TPM_UNDEFINED,
 275         TPM_SHORT,              /* 200 */
 276         TPM_UNDEFINED,
 277         TPM_UNDEFINED,
 278         TPM_UNDEFINED,
 279         TPM_SHORT,
 280         TPM_SHORT,              /* 205 */
 281         TPM_SHORT,
 282         TPM_SHORT,
 283         TPM_SHORT,
 284         TPM_SHORT,
 285         TPM_MEDIUM,             /* 210 */
 286         TPM_UNDEFINED,
 287         TPM_MEDIUM,
 288         TPM_MEDIUM,
 289         TPM_MEDIUM,
 290         TPM_UNDEFINED,          /* 215 */
 291         TPM_MEDIUM,
 292         TPM_UNDEFINED,
 293         TPM_UNDEFINED,
 294         TPM_SHORT,
 295         TPM_SHORT,              /* 220 */
 296         TPM_SHORT,
 297         TPM_SHORT,
 298         TPM_SHORT,
 299         TPM_SHORT,
 300         TPM_UNDEFINED,          /* 225 */
 301         TPM_UNDEFINED,
 302         TPM_UNDEFINED,
 303         TPM_UNDEFINED,
 304         TPM_UNDEFINED,
 305         TPM_SHORT,              /* 230 */
 306         TPM_LONG,
 307         TPM_MEDIUM,
 308         TPM_UNDEFINED,
 309         TPM_UNDEFINED,
 310         TPM_UNDEFINED,          /* 235 */
 311         TPM_UNDEFINED,
 312         TPM_UNDEFINED,
 313         TPM_UNDEFINED,
 314         TPM_UNDEFINED,
 315         TPM_SHORT,              /* 240 */
 316         TPM_UNDEFINED,
 317         TPM_MEDIUM,
 318 };
 319
 320 static void user_reader_timeout(unsigned long ptr)
 321 {
 322         struct tpm_chip *chip = (struct tpm_chip *) ptr;
 323
 324         schedule_work(&chip->work);
 325 }
 326
 327 static void timeout_work(struct work_struct *work)
 328 {
 329         struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
 330
 331         down(&chip->buffer_mutex);
 332         atomic_set(&chip->data_pending, 0);
 333         memset(chip->data_buffer, 0, TPM_BUFSIZE);
 334         up(&chip->buffer_mutex);
 335 }
 336
 337 /*
 338  * Returns max number of jiffies to wait
 339  */
 340 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
 341                                            u32 ordinal)
 342 {
 343         int duration_idx = TPM_UNDEFINED;
 344         int duration = 0;
 345
 346         if (ordinal < TPM_MAX_ORDINAL)
 347                 duration_idx = tpm_ordinal_duration[ordinal];
 348         else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
 349                  TPM_MAX_PROTECTED_ORDINAL)
 350                 duration_idx =
 351                     tpm_protected_ordinal_duration[ordinal &
 352                                                    TPM_PROTECTED_ORDINAL_MASK];
 353
 354         if (duration_idx != TPM_UNDEFINED)
 355                 duration = chip->vendor.duration[duration_idx];
 356         if (duration <= 0)
 357                 return 2 * 60 * HZ;
 358         else
 359                 return duration;
 360 }
 361 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
 362
 363 /*
 364  * Internal kernel interface to transmit TPM commands
 365  */
 366 static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 367                             size_t bufsiz)
 368 {
 369         ssize_t rc;
 370         u32 count, ordinal;
 371         unsigned long stop;
 372
 373         count = be32_to_cpu(*((__be32 *) (buf + 2)));
 374         ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
 375         if (count == 0)
 376                 return -ENODATA;
 377         if (count > bufsiz) {
 378                 dev_err(chip->dev,
 379                         "invalid count value %x %zx \n", count, bufsiz);
 380                 return -E2BIG;
 381         }
 382
 383         down(&chip->tpm_mutex);
 384
 385         if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
 386                 dev_err(chip->dev,
 387                         "tpm_transmit: tpm_send: error %zd\n", rc);
 388                 goto out;
 389         }
 390
 391         if (chip->vendor.irq)
 392                 goto out_recv;
 393
 394         stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
 395         do {
 396                 u8 status = chip->vendor.status(chip);
 397                 if ((status & chip->vendor.req_complete_mask) ==
 398                     chip->vendor.req_complete_val)
 399                         goto out_recv;
 400
 401                 if ((status == chip->vendor.req_canceled)) {
 402                         dev_err(chip->dev, "Operation Canceled\n");
 403                         rc = -ECANCELED;
 404                         goto out;
 405                 }
 406
 407                 msleep(TPM_TIMEOUT);    /* CHECK */
 408                 rmb();
 409         } while (time_before(jiffies, stop));
 410
 411         chip->vendor.cancel(chip);
 412         dev_err(chip->dev, "Operation Timed out\n");
 413         rc = -ETIME;
 414         goto out;
 415
 416 out_recv:
 417         rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
 418         if (rc < 0)
 419                 dev_err(chip->dev,
 420                         "tpm_transmit: tpm_recv: error %zd\n", rc);
 421 out:
 422         up(&chip->tpm_mutex);
 423         return rc;
 424 }
 425
 426 #define TPM_DIGEST_SIZE 20
 427 #define TPM_ERROR_SIZE 10
 428 #define TPM_RET_CODE_IDX 6
 429 #define TPM_GET_CAP_RET_SIZE_IDX 10
 430 #define TPM_GET_CAP_RET_UINT32_1_IDX 14
 431 #define TPM_GET_CAP_RET_UINT32_2_IDX 18
 432 #define TPM_GET_CAP_RET_UINT32_3_IDX 22
 433 #define TPM_GET_CAP_RET_UINT32_4_IDX 26
 434 #define TPM_GET_CAP_PERM_DISABLE_IDX 16
 435 #define TPM_GET_CAP_PERM_INACTIVE_IDX 18
 436 #define TPM_GET_CAP_RET_BOOL_1_IDX 14
 437 #define TPM_GET_CAP_TEMP_INACTIVE_IDX 16
 438
 439 #define TPM_CAP_IDX 13
 440 #define TPM_CAP_SUBCAP_IDX 21
 441
 442 enum tpm_capabilities {
 443         TPM_CAP_FLAG = 4,
 444         TPM_CAP_PROP = 5,
 445 };
 446
 447 enum tpm_sub_capabilities {
 448         TPM_CAP_PROP_PCR = 0x1,
 449         TPM_CAP_PROP_MANUFACTURER = 0x3,
 450         TPM_CAP_FLAG_PERM = 0x8,
 451         TPM_CAP_FLAG_VOL = 0x9,
 452         TPM_CAP_PROP_OWNER = 0x11,
 453         TPM_CAP_PROP_TIS_TIMEOUT = 0x15,
 454         TPM_CAP_PROP_TIS_DURATION = 0x20,
 455 };
 456
 457 /*
 458  * This is a semi generic GetCapability command for use
 459  * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG
 460  * and their associated sub_capabilities.
 461  */
 462
 463 static const u8 tpm_cap[] = {
 464         0, 193,                 /* TPM_TAG_RQU_COMMAND */
 465         0, 0, 0, 22,            /* length */
 466         0, 0, 0, 101,           /* TPM_ORD_GetCapability */
 467         0, 0, 0, 0,             /* TPM_CAP_<TYPE> */
 468         0, 0, 0, 4,             /* TPM_CAP_SUB_<TYPE> size */
 469         0, 0, 1, 0              /* TPM_CAP_SUB_<TYPE> */
 470 };
 471
 472 static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len,
 473                             char *desc)
 474 {
 475         int err;
 476
 477         len = tpm_transmit(chip, data, len);
 478         if (len <  0)
 479                 return len;
 480         if (len == TPM_ERROR_SIZE) {
 481                 err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)));
 482                 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
 483                 return err;
 484         }
 485         return 0;
 486 }
 487
 488 void tpm_gen_interrupt(struct tpm_chip *chip)
 489 {
 490         u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
 491         ssize_t rc;
 492
 493         memcpy(data, tpm_cap, sizeof(tpm_cap));
 494         data[TPM_CAP_IDX] = TPM_CAP_PROP;
 495         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
 496
 497         rc = transmit_cmd(chip, data, sizeof(data),
 498                         "attempting to determine the timeouts");
 499 }
 500 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
 501
 502 void tpm_get_timeouts(struct tpm_chip *chip)
 503 {
 504         u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
 505         ssize_t rc;
 506         u32 timeout;
 507
 508         memcpy(data, tpm_cap, sizeof(tpm_cap));
 509         data[TPM_CAP_IDX] = TPM_CAP_PROP;
 510         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
 511
 512         rc = transmit_cmd(chip, data, sizeof(data),
 513                         "attempting to determine the timeouts");
 514         if (rc)
 515                 goto duration;
 516
 517         if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
 518             != 4 * sizeof(u32))
 519                 goto duration;
 520
 521         /* Don't overwrite default if value is 0 */
 522         timeout =
 523             be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)));
 524         if (timeout)
 525                 chip->vendor.timeout_a = msecs_to_jiffies(timeout);
 526         timeout =
 527             be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)));
 528         if (timeout)
 529                 chip->vendor.timeout_b = msecs_to_jiffies(timeout);
 530         timeout =
 531             be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)));
 532         if (timeout)
 533                 chip->vendor.timeout_c = msecs_to_jiffies(timeout);
 534         timeout =
 535             be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX)));
 536         if (timeout)
 537                 chip->vendor.timeout_d = msecs_to_jiffies(timeout);
 538
 539 duration:
 540         memcpy(data, tpm_cap, sizeof(tpm_cap));
 541         data[TPM_CAP_IDX] = TPM_CAP_PROP;
 542         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_DURATION;
 543
 544         rc = transmit_cmd(chip, data, sizeof(data),
 545                         "attempting to determine the durations");
 546         if (rc)
 547                 return;
 548
 549         if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
 550             != 3 * sizeof(u32))
 551                 return;
 552
 553         chip->vendor.duration[TPM_SHORT] =
 554             msecs_to_jiffies(be32_to_cpu
 555                              (*((__be32 *) (data +
 556                                             TPM_GET_CAP_RET_UINT32_1_IDX))));
 557         chip->vendor.duration[TPM_MEDIUM] =
 558             msecs_to_jiffies(be32_to_cpu
 559                              (*((__be32 *) (data +
 560                                             TPM_GET_CAP_RET_UINT32_2_IDX))));
 561         chip->vendor.duration[TPM_LONG] =
 562             msecs_to_jiffies(be32_to_cpu
 563                              (*((__be32 *) (data +
 564                                             TPM_GET_CAP_RET_UINT32_3_IDX))));
 565 }
 566 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
 567
 568 void tpm_continue_selftest(struct tpm_chip *chip)
 569 {
 570         u8 data[] = {
 571                 0, 193,                 /* TPM_TAG_RQU_COMMAND */
 572                 0, 0, 0, 10,            /* length */
 573                 0, 0, 0, 83,            /* TPM_ORD_GetCapability */
 574         };
 575
 576         tpm_transmit(chip, data, sizeof(data));
 577 }
 578 EXPORT_SYMBOL_GPL(tpm_continue_selftest);
 579
 580 ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
 581                         char *buf)
 582 {
 583         u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)];
 584         ssize_t rc;
 585
 586         struct tpm_chip *chip = dev_get_drvdata(dev);
 587         if (chip == NULL)
 588                 return -ENODEV;
 589
 590         memcpy(data, tpm_cap, sizeof(tpm_cap));
 591         data[TPM_CAP_IDX] = TPM_CAP_FLAG;
 592         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
 593
 594         rc = transmit_cmd(chip, data, sizeof(data),
 595                         "attemtping to determine the permanent state");
 596         if (rc)
 597                 return 0;
 598         return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]);
 599 }
 600 EXPORT_SYMBOL_GPL(tpm_show_enabled);
 601
 602 ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
 603                         char *buf)
 604 {
 605         u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)];
 606         ssize_t rc;
 607
 608         struct tpm_chip *chip = dev_get_drvdata(dev);
 609         if (chip == NULL)
 610                 return -ENODEV;
 611
 612         memcpy(data, tpm_cap, sizeof(tpm_cap));
 613         data[TPM_CAP_IDX] = TPM_CAP_FLAG;
 614         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
 615
 616         rc = transmit_cmd(chip, data, sizeof(data),
 617                         "attemtping to determine the permanent state");
 618         if (rc)
 619                 return 0;
 620         return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]);
 621 }
 622 EXPORT_SYMBOL_GPL(tpm_show_active);
 623
 624 ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
 625                         char *buf)
 626 {
 627         u8 data[sizeof(tpm_cap)];
 628         ssize_t rc;
 629
 630         struct tpm_chip *chip = dev_get_drvdata(dev);
 631         if (chip == NULL)
 632                 return -ENODEV;
 633
 634         memcpy(data, tpm_cap, sizeof(tpm_cap));
 635         data[TPM_CAP_IDX] = TPM_CAP_PROP;
 636         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER;
 637
 638         rc = transmit_cmd(chip, data, sizeof(data),
 639                         "attempting to determine the owner state");
 640         if (rc)
 641                 return 0;
 642         return sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]);
 643 }
 644 EXPORT_SYMBOL_GPL(tpm_show_owned);
 645
 646 ssize_t tpm_show_temp_deactivated(struct device * dev,
 647                                 struct device_attribute * attr, char *buf)
 648 {
 649         u8 data[sizeof(tpm_cap)];
 650         ssize_t rc;
 651
 652         struct tpm_chip *chip = dev_get_drvdata(dev);
 653         if (chip == NULL)
 654                 return -ENODEV;
 655
 656         memcpy(data, tpm_cap, sizeof(tpm_cap));
 657         data[TPM_CAP_IDX] = TPM_CAP_FLAG;
 658         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL;
 659
 660         rc = transmit_cmd(chip, data, sizeof(data),
 661                         "attempting to determine the temporary state");
 662         if (rc)
 663                 return 0;
 664         return sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]);
 665 }
 666 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
 667
 668 static const u8 pcrread[] = {
 669         0, 193,                 /* TPM_TAG_RQU_COMMAND */
 670         0, 0, 0, 14,            /* length */
 671         0, 0, 0, 21,            /* TPM_ORD_PcrRead */
 672         0, 0, 0, 0              /* PCR index */
 673 };
 674
 675 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
 676                       char *buf)
 677 {
 678         u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(pcrread)), 30)];
 679         ssize_t rc;
 680         int i, j, num_pcrs;
 681         __be32 index;
 682         char *str = buf;
 683
 684         struct tpm_chip *chip = dev_get_drvdata(dev);
 685         if (chip == NULL)
 686                 return -ENODEV;
 687
 688         memcpy(data, tpm_cap, sizeof(tpm_cap));
 689         data[TPM_CAP_IDX] = TPM_CAP_PROP;
 690         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR;
 691
 692         rc = transmit_cmd(chip, data, sizeof(data),
 693                         "attempting to determine the number of PCRS");
 694         if (rc)
 695                 return 0;
 696
 697         num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));
 698         for (i = 0; i < num_pcrs; i++) {
 699                 memcpy(data, pcrread, sizeof(pcrread));
 700                 index = cpu_to_be32(i);
 701                 memcpy(data + 10, &index, 4);
 702                 rc = transmit_cmd(chip, data, sizeof(data),
 703                                 "attempting to read a PCR");
 704                 if (rc)
 705                         goto out;
 706                 str += sprintf(str, "PCR-%02d: ", i);
 707                 for (j = 0; j < TPM_DIGEST_SIZE; j++)
 708                         str += sprintf(str, "%02X ", *(data + 10 + j));
 709                 str += sprintf(str, "\n");
 710         }
 711 out:
 712         return str - buf;
 713 }
 714 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
 715
 716 #define  READ_PUBEK_RESULT_SIZE 314
 717 static const u8 readpubek[] = {
 718         0, 193,                 /* TPM_TAG_RQU_COMMAND */
 719         0, 0, 0, 30,            /* length */
 720         0, 0, 0, 124,           /* TPM_ORD_ReadPubek */
 721 };
 722
 723 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
 724                        char *buf)
 725 {
 726         u8 *data;
 727         ssize_t err;
 728         int i, rc;
 729         char *str = buf;
 730
 731         struct tpm_chip *chip = dev_get_drvdata(dev);
 732         if (chip == NULL)
 733                 return -ENODEV;
 734
 735         data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);
 736         if (!data)
 737                 return -ENOMEM;
 738
 739         memcpy(data, readpubek, sizeof(readpubek));
 740
 741         err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE,
 742                         "attempting to read the PUBEK");
 743         if (err)
 744                 goto out;
 745
 746         /*
 747            ignore header 10 bytes
 748            algorithm 32 bits (1 == RSA )
 749            encscheme 16 bits
 750            sigscheme 16 bits
 751            parameters (RSA 12->bytes: keybit, #primes, expbit)
 752            keylenbytes 32 bits
 753            256 byte modulus
 754            ignore checksum 20 bytes
 755          */
 756
 757         str +=
 758             sprintf(str,
 759                     "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
 760                     "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
 761                     " %02X %02X %02X %02X %02X %02X %02X %02X\n"
 762                     "Modulus length: %d\nModulus: \n",
 763                     data[10], data[11], data[12], data[13], data[14],
 764                     data[15], data[16], data[17], data[22], data[23],
 765                     data[24], data[25], data[26], data[27], data[28],
 766                     data[29], data[30], data[31], data[32], data[33],
 767                     be32_to_cpu(*((__be32 *) (data + 34))));
 768
 769         for (i = 0; i < 256; i++) {
 770                 str += sprintf(str, "%02X ", data[i + 38]);
 771                 if ((i + 1) % 16 == 0)
 772                         str += sprintf(str, "\n");
 773         }
 774 out:
 775         rc = str - buf;
 776         kfree(data);
 777         return rc;
 778 }
 779 EXPORT_SYMBOL_GPL(tpm_show_pubek);
 780
 781 #define CAP_VERSION_1_1 6
 782 #define CAP_VERSION_1_2 0x1A
 783 #define CAP_VERSION_IDX 13
 784 static const u8 cap_version[] = {
 785         0, 193,                 /* TPM_TAG_RQU_COMMAND */
 786         0, 0, 0, 18,            /* length */
 787         0, 0, 0, 101,           /* TPM_ORD_GetCapability */
 788         0, 0, 0, 0,
 789         0, 0, 0, 0
 790 };
 791
 792 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
 793                       char *buf)
 794 {
 795         u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)];
 796         ssize_t rc;
 797         char *str = buf;
 798
 799         struct tpm_chip *chip = dev_get_drvdata(dev);
 800         if (chip == NULL)
 801                 return -ENODEV;
 802
 803         memcpy(data, tpm_cap, sizeof(tpm_cap));
 804         data[TPM_CAP_IDX] = TPM_CAP_PROP;
 805         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
 806
 807         rc = transmit_cmd(chip, data, sizeof(data),
 808                         "attempting to determine the manufacturer");
 809         if (rc)
 810                 return 0;
 811
 812         str += sprintf(str, "Manufacturer: 0x%x\n",
 813                        be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
 814
 815         memcpy(data, cap_version, sizeof(cap_version));
 816         data[CAP_VERSION_IDX] = CAP_VERSION_1_1;
 817         rc = transmit_cmd(chip, data, sizeof(data),
 818                         "attempting to determine the 1.1 version");
 819         if (rc)
 820                 goto out;
 821
 822         str += sprintf(str,
 823                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
 824                        (int) data[14], (int) data[15], (int) data[16],
 825                        (int) data[17]);
 826
 827 out:
 828         return str - buf;
 829 }
 830 EXPORT_SYMBOL_GPL(tpm_show_caps);
 831
 832 ssize_t tpm_show_caps_1_2(struct device * dev,
 833                           struct device_attribute * attr, char *buf)
 834 {
 835         u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)];
 836         ssize_t len;
 837         char *str = buf;
 838
 839         struct tpm_chip *chip = dev_get_drvdata(dev);
 840         if (chip == NULL)
 841                 return -ENODEV;
 842
 843         memcpy(data, tpm_cap, sizeof(tpm_cap));
 844         data[TPM_CAP_IDX] = TPM_CAP_PROP;
 845         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
 846
 847         if ((len = tpm_transmit(chip, data, sizeof(data))) <=
 848             TPM_ERROR_SIZE) {
 849                 dev_dbg(chip->dev, "A TPM error (%d) occurred "
 850                         "attempting to determine the manufacturer\n",
 851                         be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
 852                 return 0;
 853         }
 854
 855         str += sprintf(str, "Manufacturer: 0x%x\n",
 856                        be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
 857
 858         memcpy(data, cap_version, sizeof(cap_version));
 859         data[CAP_VERSION_IDX] = CAP_VERSION_1_2;
 860
 861         if ((len = tpm_transmit(chip, data, sizeof(data))) <=
 862             TPM_ERROR_SIZE) {
 863                 dev_err(chip->dev, "A TPM error (%d) occurred "
 864                         "attempting to determine the 1.2 version\n",
 865                         be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
 866                 goto out;
 867         }
 868         str += sprintf(str,
 869                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
 870                        (int) data[16], (int) data[17], (int) data[18],
 871                        (int) data[19]);
 872
 873 out:
 874         return str - buf;
 875 }
 876 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
 877
 878 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
 879                         const char *buf, size_t count)
 880 {
 881         struct tpm_chip *chip = dev_get_drvdata(dev);
 882         if (chip == NULL)
 883                 return 0;
 884
 885         chip->vendor.cancel(chip);
 886         return count;
 887 }
 888 EXPORT_SYMBOL_GPL(tpm_store_cancel);
 889
 890 /*
 891  * Device file system interface to the TPM
 892  */
 893 int tpm_open(struct inode *inode, struct file *file)
 894 {
 895         int rc = 0, minor = iminor(inode);
 896         struct tpm_chip *chip = NULL, *pos;
 897
 898         spin_lock(&driver_lock);
 899
 900         list_for_each_entry(pos, &tpm_chip_list, list) {
 901                 if (pos->vendor.miscdev.minor == minor) {
 902                         chip = pos;
 903                         break;
 904                 }
 905         }
 906
 907         if (chip == NULL) {
 908                 rc = -ENODEV;
 909                 goto err_out;
 910         }
 911
 912         if (chip->num_opens) {
 913                 dev_dbg(chip->dev, "Another process owns this TPM\n");
 914                 rc = -EBUSY;
 915                 goto err_out;
 916         }
 917
 918         chip->num_opens++;
 919         get_device(chip->dev);
 920
 921         spin_unlock(&driver_lock);
 922
 923         chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
 924         if (chip->data_buffer == NULL) {
 925                 chip->num_opens--;
 926                 put_device(chip->dev);
 927                 return -ENOMEM;
 928         }
 929
 930         atomic_set(&chip->data_pending, 0);
 931
 932         file->private_data = chip;
 933         return 0;
 934
 935 err_out:
 936         spin_unlock(&driver_lock);
 937         return rc;
 938 }
 939 EXPORT_SYMBOL_GPL(tpm_open);
 940
 941 int tpm_release(struct inode *inode, struct file *file)
 942 {
 943         struct tpm_chip *chip = file->private_data;
 944
 945         spin_lock(&driver_lock);
 946         file->private_data = NULL;
 947         chip->num_opens--;
 948         del_singleshot_timer_sync(&chip->user_read_timer);
 949         flush_scheduled_work();
 950         atomic_set(&chip->data_pending, 0);
 951         put_device(chip->dev);
 952         kfree(chip->data_buffer);
 953         spin_unlock(&driver_lock);
 954         return 0;
 955 }
 956 EXPORT_SYMBOL_GPL(tpm_release);
 957
 958 ssize_t tpm_write(struct file *file, const char __user *buf,
 959                   size_t size, loff_t *off)
 960 {
 961         struct tpm_chip *chip = file->private_data;
 962         int in_size = size, out_size;
 963
 964         /* cannot perform a write until the read has cleared
 965            either via tpm_read or a user_read_timer timeout */
 966         while (atomic_read(&chip->data_pending) != 0)
 967                 msleep(TPM_TIMEOUT);
 968
 969         down(&chip->buffer_mutex);
 970
 971         if (in_size > TPM_BUFSIZE)
 972                 in_size = TPM_BUFSIZE;
 973
 974         if (copy_from_user
 975             (chip->data_buffer, (void __user *) buf, in_size)) {
 976                 up(&chip->buffer_mutex);
 977                 return -EFAULT;
 978         }
 979
 980         /* atomic tpm command send and result receive */
 981         out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
 982
 983         atomic_set(&chip->data_pending, out_size);
 984         up(&chip->buffer_mutex);
 985
 986         /* Set a timeout by which the reader must come claim the result */
 987         mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
 988
 989         return in_size;
 990 }
 991 EXPORT_SYMBOL_GPL(tpm_write);
 992
 993 ssize_t tpm_read(struct file *file, char __user *buf,
 994                  size_t size, loff_t *off)
 995 {
 996         struct tpm_chip *chip = file->private_data;
 997         int ret_size;
 998
 999         del_singleshot_timer_sync(&chip->user_read_timer);
1000         flush_scheduled_work();
1001         ret_size = atomic_read(&chip->data_pending);
1002         atomic_set(&chip->data_pending, 0);
1003         if (ret_size > 0) {     /* relay data */
1004                 if (size < ret_size)
1005                         ret_size = size;
1006
1007                 down(&chip->buffer_mutex);
1008                 if (copy_to_user(buf, chip->data_buffer, ret_size))
1009                         ret_size = -EFAULT;
1010                 up(&chip->buffer_mutex);
1011         }
1012
1013         return ret_size;
1014 }
1015 EXPORT_SYMBOL_GPL(tpm_read);
1016
1017 void tpm_remove_hardware(struct device *dev)
1018 {
1019         struct tpm_chip *chip = dev_get_drvdata(dev);
1020
1021         if (chip == NULL) {
1022                 dev_err(dev, "No device data found\n");
1023                 return;
1024         }
1025
1026         spin_lock(&driver_lock);
1027
1028         list_del(&chip->list);
1029
1030         spin_unlock(&driver_lock);
1031
1032         dev_set_drvdata(dev, NULL);
1033         misc_deregister(&chip->vendor.miscdev);
1034         kfree(chip->vendor.miscdev.name);
1035
1036         sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1037         tpm_bios_log_teardown(chip->bios_dir);
1038
1039         clear_bit(chip->dev_num, dev_mask);
1040
1041         kfree(chip);
1042
1043         put_device(dev);
1044 }
1045 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1046
1047 static u8 savestate[] = {
1048         0, 193,                 /* TPM_TAG_RQU_COMMAND */
1049         0, 0, 0, 10,            /* blob length (in bytes) */
1050         0, 0, 0, 152            /* TPM_ORD_SaveState */
1051 };
1052
1053 /*
1054  * We are about to suspend. Save the TPM state
1055  * so that it can be restored.
1056  */
1057 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1058 {
1059         struct tpm_chip *chip = dev_get_drvdata(dev);
1060         if (chip == NULL)
1061                 return -ENODEV;
1062
1063         tpm_transmit(chip, savestate, sizeof(savestate));
1064         return 0;
1065 }
1066 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1067
1068 /*
1069  * Resume from a power safe. The BIOS already restored
1070  * the TPM state.
1071  */
1072 int tpm_pm_resume(struct device *dev)
1073 {
1074         struct tpm_chip *chip = dev_get_drvdata(dev);
1075
1076         if (chip == NULL)
1077                 return -ENODEV;
1078
1079         return 0;
1080 }
1081 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1082
1083 /*
1084  * Called from tpm_<specific>.c probe function only for devices
1085  * the driver has determined it should claim.  Prior to calling
1086  * this function the specific probe function has called pci_enable_device
1087  * upon errant exit from this function specific probe function should call
1088  * pci_disable_device
1089  */
1090 struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vendor_specific
1091                                        *entry)
1092 {
1093 #define DEVNAME_SIZE 7
1094
1095         char *devname;
1096         struct tpm_chip *chip;
1097
1098         /* Driver specific per-device data */
1099         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1100         if (chip == NULL)
1101                 return NULL;
1102
1103         init_MUTEX(&chip->buffer_mutex);
1104         init_MUTEX(&chip->tpm_mutex);
1105         INIT_LIST_HEAD(&chip->list);
1106
1107         INIT_WORK(&chip->work, timeout_work);
1108
1109         setup_timer(&chip->user_read_timer, user_reader_timeout,
1110                         (unsigned long)chip);
1111
1112         memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1113
1114         chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1115
1116         if (chip->dev_num >= TPM_NUM_DEVICES) {
1117                 dev_err(dev, "No available tpm device numbers\n");
1118                 kfree(chip);
1119                 return NULL;
1120         } else if (chip->dev_num == 0)
1121                 chip->vendor.miscdev.minor = TPM_MINOR;
1122         else
1123                 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1124
1125         set_bit(chip->dev_num, dev_mask);
1126
1127         devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1128         scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
1129         chip->vendor.miscdev.name = devname;
1130
1131         chip->vendor.miscdev.parent = dev;
1132         chip->dev = get_device(dev);
1133
1134         if (misc_register(&chip->vendor.miscdev)) {
1135                 dev_err(chip->dev,
1136                         "unable to misc_register %s, minor %d\n",
1137                         chip->vendor.miscdev.name,
1138                         chip->vendor.miscdev.minor);
1139                 put_device(dev);
1140                 clear_bit(chip->dev_num, dev_mask);
1141                 kfree(chip);
1142                 kfree(devname);
1143                 return NULL;
1144         }
1145
1146         spin_lock(&driver_lock);
1147
1148         dev_set_drvdata(dev, chip);
1149
1150         list_add(&chip->list, &tpm_chip_list);
1151
1152         spin_unlock(&driver_lock);
1153
1154         if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1155                 list_del(&chip->list);
1156                 misc_deregister(&chip->vendor.miscdev);
1157                 put_device(dev);
1158                 clear_bit(chip->dev_num, dev_mask);
1159                 kfree(chip);
1160                 kfree(devname);
1161                 return NULL;
1162         }
1163
1164         chip->bios_dir = tpm_bios_log_setup(devname);
1165
1166         return chip;
1167 }
1168 EXPORT_SYMBOL_GPL(tpm_register_hardware);
1169
1170 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1171 MODULE_DESCRIPTION("TPM Driver");
1172 MODULE_VERSION("2.0");
1173 MODULE_LICENSE("GPL");