?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
x86/topology: Fix function name in documentation
[cris-mirror.git] / drivers / char / tpm / tpm-interface.c
blob76df4fbcf089c2371b2ad8b08f31bf446b5c488b
1 /*
2 * Copyright (C) 2004 IBM Corporation
3 * Copyright (C) 2014 Intel Corporation
4 *
5 * Authors:
6 * Leendert van Doorn <leendert@watson.ibm.com>
7 * Dave Safford <safford@watson.ibm.com>
8 * Reiner Sailer <sailer@watson.ibm.com>
9 * Kylene Hall <kjhall@us.ibm.com>
10 *
11 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
12 *
13 * Device driver for TCG/TCPA TPM (trusted platform module).
14 * Specifications at www.trustedcomputinggroup.org
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License as
18 * published by the Free Software Foundation, version 2 of the
19 * License.
20 *
21 * Note, the TPM chip is not interrupt driven (only polling)
22 * and can have very long timeouts (minutes!). Hence the unusual
23 * calls to msleep.
24 *
25 */
26
27 #include <linux/poll.h>
28 #include <linux/slab.h>
29 #include <linux/mutex.h>
30 #include <linux/spinlock.h>
31 #include <linux/freezer.h>
32 #include <linux/pm_runtime.h>
33 #include <linux/tpm_eventlog.h>
34
35 #include "tpm.h"
36
37 #define TPM_MAX_ORDINAL 243
38 #define TSC_MAX_ORDINAL 12
39 #define TPM_PROTECTED_COMMAND 0x00
40 #define TPM_CONNECTION_COMMAND 0x40
41
42 /*
43 * Bug workaround - some TPM's don't flush the most
44 * recently changed pcr on suspend, so force the flush
45 * with an extend to the selected _unused_ non-volatile pcr.
46 */
47 static int tpm_suspend_pcr;
48 module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
49 MODULE_PARM_DESC(suspend_pcr,
50 "PCR to use for dummy writes to facilitate flush on suspend.");
51
52 /*
53 * Array with one entry per ordinal defining the maximum amount
54 * of time the chip could take to return the result. The ordinal
55 * designation of short, medium or long is defined in a table in
56 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
57 * values of the SHORT, MEDIUM, and LONG durations are retrieved
58 * from the chip during initialization with a call to tpm_get_timeouts.
59 */
60 static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
61 TPM_UNDEFINED, /* 0 */
62 TPM_UNDEFINED,
63 TPM_UNDEFINED,
64 TPM_UNDEFINED,
65 TPM_UNDEFINED,
66 TPM_UNDEFINED, /* 5 */
67 TPM_UNDEFINED,
68 TPM_UNDEFINED,
69 TPM_UNDEFINED,
70 TPM_UNDEFINED,
71 TPM_SHORT, /* 10 */
72 TPM_SHORT,
73 TPM_MEDIUM,
74 TPM_LONG,
75 TPM_LONG,
76 TPM_MEDIUM, /* 15 */
77 TPM_SHORT,
78 TPM_SHORT,
79 TPM_MEDIUM,
80 TPM_LONG,
81 TPM_SHORT, /* 20 */
82 TPM_SHORT,
83 TPM_MEDIUM,
84 TPM_MEDIUM,
85 TPM_MEDIUM,
86 TPM_SHORT, /* 25 */
87 TPM_SHORT,
88 TPM_MEDIUM,
89 TPM_SHORT,
90 TPM_SHORT,
91 TPM_MEDIUM, /* 30 */
92 TPM_LONG,
93 TPM_MEDIUM,
94 TPM_SHORT,
95 TPM_SHORT,
96 TPM_SHORT, /* 35 */
97 TPM_MEDIUM,
98 TPM_MEDIUM,
99 TPM_UNDEFINED,
100 TPM_UNDEFINED,
101 TPM_MEDIUM, /* 40 */
102 TPM_LONG,
103 TPM_MEDIUM,
104 TPM_SHORT,
105 TPM_SHORT,
106 TPM_SHORT, /* 45 */
107 TPM_SHORT,
108 TPM_SHORT,
109 TPM_SHORT,
110 TPM_LONG,
111 TPM_MEDIUM, /* 50 */
112 TPM_MEDIUM,
113 TPM_UNDEFINED,
114 TPM_UNDEFINED,
115 TPM_UNDEFINED,
116 TPM_UNDEFINED, /* 55 */
117 TPM_UNDEFINED,
118 TPM_UNDEFINED,
119 TPM_UNDEFINED,
120 TPM_UNDEFINED,
121 TPM_MEDIUM, /* 60 */
122 TPM_MEDIUM,
123 TPM_MEDIUM,
124 TPM_SHORT,
125 TPM_SHORT,
126 TPM_MEDIUM, /* 65 */
127 TPM_UNDEFINED,
128 TPM_UNDEFINED,
129 TPM_UNDEFINED,
130 TPM_UNDEFINED,
131 TPM_SHORT, /* 70 */
132 TPM_SHORT,
133 TPM_UNDEFINED,
134 TPM_UNDEFINED,
135 TPM_UNDEFINED,
136 TPM_UNDEFINED, /* 75 */
137 TPM_UNDEFINED,
138 TPM_UNDEFINED,
139 TPM_UNDEFINED,
140 TPM_UNDEFINED,
141 TPM_LONG, /* 80 */
142 TPM_UNDEFINED,
143 TPM_MEDIUM,
144 TPM_LONG,
145 TPM_SHORT,
146 TPM_UNDEFINED, /* 85 */
147 TPM_UNDEFINED,
148 TPM_UNDEFINED,
149 TPM_UNDEFINED,
150 TPM_UNDEFINED,
151 TPM_SHORT, /* 90 */
152 TPM_SHORT,
153 TPM_SHORT,
154 TPM_SHORT,
155 TPM_SHORT,
156 TPM_UNDEFINED, /* 95 */
157 TPM_UNDEFINED,
158 TPM_UNDEFINED,
159 TPM_UNDEFINED,
160 TPM_UNDEFINED,
161 TPM_MEDIUM, /* 100 */
162 TPM_SHORT,
163 TPM_SHORT,
164 TPM_UNDEFINED,
165 TPM_UNDEFINED,
166 TPM_UNDEFINED, /* 105 */
167 TPM_UNDEFINED,
168 TPM_UNDEFINED,
169 TPM_UNDEFINED,
170 TPM_UNDEFINED,
171 TPM_SHORT, /* 110 */
172 TPM_SHORT,
173 TPM_SHORT,
174 TPM_SHORT,
175 TPM_SHORT,
176 TPM_SHORT, /* 115 */
177 TPM_SHORT,
178 TPM_SHORT,
179 TPM_UNDEFINED,
180 TPM_UNDEFINED,
181 TPM_LONG, /* 120 */
182 TPM_LONG,
183 TPM_MEDIUM,
184 TPM_UNDEFINED,
185 TPM_SHORT,
186 TPM_SHORT, /* 125 */
187 TPM_SHORT,
188 TPM_LONG,
189 TPM_SHORT,
190 TPM_SHORT,
191 TPM_SHORT, /* 130 */
192 TPM_MEDIUM,
193 TPM_UNDEFINED,
194 TPM_SHORT,
195 TPM_MEDIUM,
196 TPM_UNDEFINED, /* 135 */
197 TPM_UNDEFINED,
198 TPM_UNDEFINED,
199 TPM_UNDEFINED,
200 TPM_UNDEFINED,
201 TPM_SHORT, /* 140 */
202 TPM_SHORT,
203 TPM_UNDEFINED,
204 TPM_UNDEFINED,
205 TPM_UNDEFINED,
206 TPM_UNDEFINED, /* 145 */
207 TPM_UNDEFINED,
208 TPM_UNDEFINED,
209 TPM_UNDEFINED,
210 TPM_UNDEFINED,
211 TPM_SHORT, /* 150 */
212 TPM_MEDIUM,
213 TPM_MEDIUM,
214 TPM_SHORT,
215 TPM_SHORT,
216 TPM_UNDEFINED, /* 155 */
217 TPM_UNDEFINED,
218 TPM_UNDEFINED,
219 TPM_UNDEFINED,
220 TPM_UNDEFINED,
221 TPM_SHORT, /* 160 */
222 TPM_SHORT,
223 TPM_SHORT,
224 TPM_SHORT,
225 TPM_UNDEFINED,
226 TPM_UNDEFINED, /* 165 */
227 TPM_UNDEFINED,
228 TPM_UNDEFINED,
229 TPM_UNDEFINED,
230 TPM_UNDEFINED,
231 TPM_LONG, /* 170 */
232 TPM_UNDEFINED,
233 TPM_UNDEFINED,
234 TPM_UNDEFINED,
235 TPM_UNDEFINED,
236 TPM_UNDEFINED, /* 175 */
237 TPM_UNDEFINED,
238 TPM_UNDEFINED,
239 TPM_UNDEFINED,
240 TPM_UNDEFINED,
241 TPM_MEDIUM, /* 180 */
242 TPM_SHORT,
243 TPM_MEDIUM,
244 TPM_MEDIUM,
245 TPM_MEDIUM,
246 TPM_MEDIUM, /* 185 */
247 TPM_SHORT,
248 TPM_UNDEFINED,
249 TPM_UNDEFINED,
250 TPM_UNDEFINED,
251 TPM_UNDEFINED, /* 190 */
252 TPM_UNDEFINED,
253 TPM_UNDEFINED,
254 TPM_UNDEFINED,
255 TPM_UNDEFINED,
256 TPM_UNDEFINED, /* 195 */
257 TPM_UNDEFINED,
258 TPM_UNDEFINED,
259 TPM_UNDEFINED,
260 TPM_UNDEFINED,
261 TPM_SHORT, /* 200 */
262 TPM_UNDEFINED,
263 TPM_UNDEFINED,
264 TPM_UNDEFINED,
265 TPM_SHORT,
266 TPM_SHORT, /* 205 */
267 TPM_SHORT,
268 TPM_SHORT,
269 TPM_SHORT,
270 TPM_SHORT,
271 TPM_MEDIUM, /* 210 */
272 TPM_UNDEFINED,
273 TPM_MEDIUM,
274 TPM_MEDIUM,
275 TPM_MEDIUM,
276 TPM_UNDEFINED, /* 215 */
277 TPM_MEDIUM,
278 TPM_UNDEFINED,
279 TPM_UNDEFINED,
280 TPM_SHORT,
281 TPM_SHORT, /* 220 */
282 TPM_SHORT,
283 TPM_SHORT,
284 TPM_SHORT,
285 TPM_SHORT,
286 TPM_UNDEFINED, /* 225 */
287 TPM_UNDEFINED,
288 TPM_UNDEFINED,
289 TPM_UNDEFINED,
290 TPM_UNDEFINED,
291 TPM_SHORT, /* 230 */
292 TPM_LONG,
293 TPM_MEDIUM,
294 TPM_UNDEFINED,
295 TPM_UNDEFINED,
296 TPM_UNDEFINED, /* 235 */
297 TPM_UNDEFINED,
298 TPM_UNDEFINED,
299 TPM_UNDEFINED,
300 TPM_UNDEFINED,
301 TPM_SHORT, /* 240 */
302 TPM_UNDEFINED,
303 TPM_MEDIUM,
304 };
305
306 /*
307 * Returns max number of jiffies to wait
308 */
309 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
310 u32 ordinal)
311 {
312 int duration_idx = TPM_UNDEFINED;
313 int duration = 0;
314
315 /*
316 * We only have a duration table for protected commands, where the upper
317 * 16 bits are 0. For the few other ordinals the fallback will be used.
318 */
319 if (ordinal < TPM_MAX_ORDINAL)
320 duration_idx = tpm_ordinal_duration[ordinal];
321
322 if (duration_idx != TPM_UNDEFINED)
323 duration = chip->duration[duration_idx];
324 if (duration <= 0)
325 return 2 * 60 * HZ;
326 else
327 return duration;
328 }
329 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
330
331 static int tpm_validate_command(struct tpm_chip *chip,
332 struct tpm_space *space,
333 const u8 *cmd,
334 size_t len)
335 {
336 const struct tpm_input_header *header = (const void *)cmd;
337 int i;
338 u32 cc;
339 u32 attrs;
340 unsigned int nr_handles;
341
342 if (len < TPM_HEADER_SIZE)
343 return -EINVAL;
344
345 if (!space)
346 return 0;
347
348 if (chip->flags & TPM_CHIP_FLAG_TPM2 && chip->nr_commands) {
349 cc = be32_to_cpu(header->ordinal);
350
351 i = tpm2_find_cc(chip, cc);
352 if (i < 0) {
353 dev_dbg(&chip->dev, "0x%04X is an invalid command\n",
354 cc);
355 return -EOPNOTSUPP;
356 }
357
358 attrs = chip->cc_attrs_tbl[i];
359 nr_handles =
360 4 * ((attrs >> TPM2_CC_ATTR_CHANDLES) & GENMASK(2, 0));
361 if (len < TPM_HEADER_SIZE + 4 * nr_handles)
362 goto err_len;
363 }
364
365 return 0;
366 err_len:
367 dev_dbg(&chip->dev,
368 "%s: insufficient command length %zu", __func__, len);
369 return -EINVAL;
370 }
371
372 /**
373 * tmp_transmit - Internal kernel interface to transmit TPM commands.
374 *
375 * @chip: TPM chip to use
376 * @buf: TPM command buffer
377 * @bufsiz: length of the TPM command buffer
378 * @flags: tpm transmit flags - bitmap
379 *
380 * Return:
381 * 0 when the operation is successful.
382 * A negative number for system errors (errno).
383 */
384 ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
385 u8 *buf, size_t bufsiz, unsigned int flags)
386 {
387 struct tpm_output_header *header = (void *)buf;
388 int rc;
389 ssize_t len = 0;
390 u32 count, ordinal;
391 unsigned long stop;
392 bool need_locality;
393
394 rc = tpm_validate_command(chip, space, buf, bufsiz);
395 if (rc == -EINVAL)
396 return rc;
397 /*
398 * If the command is not implemented by the TPM, synthesize a
399 * response with a TPM2_RC_COMMAND_CODE return for user-space.
400 */
401 if (rc == -EOPNOTSUPP) {
402 header->length = cpu_to_be32(sizeof(*header));
403 header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
404 header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE |
405 TSS2_RESMGR_TPM_RC_LAYER);
406 return bufsiz;
407 }
408
409 if (bufsiz > TPM_BUFSIZE)
410 bufsiz = TPM_BUFSIZE;
411
412 count = be32_to_cpu(*((__be32 *) (buf + 2)));
413 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
414 if (count == 0)
415 return -ENODATA;
416 if (count > bufsiz) {
417 dev_err(&chip->dev,
418 "invalid count value %x %zx\n", count, bufsiz);
419 return -E2BIG;
420 }
421
422 if (!(flags & TPM_TRANSMIT_UNLOCKED))
423 mutex_lock(&chip->tpm_mutex);
424
425 if (chip->dev.parent)
426 pm_runtime_get_sync(chip->dev.parent);
427
428 if (chip->ops->clk_enable != NULL)
429 chip->ops->clk_enable(chip, true);
430
431 /* Store the decision as chip->locality will be changed. */
432 need_locality = chip->locality == -1;
433
434 if (!(flags & TPM_TRANSMIT_RAW) &&
435 need_locality && chip->ops->request_locality) {
436 rc = chip->ops->request_locality(chip, 0);
437 if (rc < 0)
438 goto out_no_locality;
439 chip->locality = rc;
440 }
441
442 rc = tpm2_prepare_space(chip, space, ordinal, buf);
443 if (rc)
444 goto out;
445
446 rc = chip->ops->send(chip, (u8 *) buf, count);
447 if (rc < 0) {
448 if (rc != -EPIPE)
449 dev_err(&chip->dev,
450 "%s: tpm_send: error %d\n", __func__, rc);
451 goto out;
452 }
453
454 if (chip->flags & TPM_CHIP_FLAG_IRQ)
455 goto out_recv;
456
457 if (chip->flags & TPM_CHIP_FLAG_TPM2)
458 stop = jiffies + tpm2_calc_ordinal_duration(chip, ordinal);
459 else
460 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
461 do {
462 u8 status = chip->ops->status(chip);
463 if ((status & chip->ops->req_complete_mask) ==
464 chip->ops->req_complete_val)
465 goto out_recv;
466
467 if (chip->ops->req_canceled(chip, status)) {
468 dev_err(&chip->dev, "Operation Canceled\n");
469 rc = -ECANCELED;
470 goto out;
471 }
472
473 tpm_msleep(TPM_TIMEOUT);
474 rmb();
475 } while (time_before(jiffies, stop));
476
477 chip->ops->cancel(chip);
478 dev_err(&chip->dev, "Operation Timed out\n");
479 rc = -ETIME;
480 goto out;
481
482 out_recv:
483 len = chip->ops->recv(chip, (u8 *) buf, bufsiz);
484 if (len < 0) {
485 rc = len;
486 dev_err(&chip->dev,
487 "tpm_transmit: tpm_recv: error %d\n", rc);
488 goto out;
489 } else if (len < TPM_HEADER_SIZE) {
490 rc = -EFAULT;
491 goto out;
492 }
493
494 if (len != be32_to_cpu(header->length)) {
495 rc = -EFAULT;
496 goto out;
497 }
498
499 rc = tpm2_commit_space(chip, space, ordinal, buf, &len);
500
501 out:
502 if (need_locality && chip->ops->relinquish_locality) {
503 chip->ops->relinquish_locality(chip, chip->locality);
504 chip->locality = -1;
505 }
506 out_no_locality:
507 if (chip->ops->clk_enable != NULL)
508 chip->ops->clk_enable(chip, false);
509
510 if (chip->dev.parent)
511 pm_runtime_put_sync(chip->dev.parent);
512
513 if (!(flags & TPM_TRANSMIT_UNLOCKED))
514 mutex_unlock(&chip->tpm_mutex);
515 return rc ? rc : len;
516 }
517
518 /**
519 * tmp_transmit_cmd - send a tpm command to the device
520 * The function extracts tpm out header return code
521 *
522 * @chip: TPM chip to use
523 * @buf: TPM command buffer
524 * @bufsiz: length of the buffer
525 * @min_rsp_body_length: minimum expected length of response body
526 * @flags: tpm transmit flags - bitmap
527 * @desc: command description used in the error message
528 *
529 * Return:
530 * 0 when the operation is successful.
531 * A negative number for system errors (errno).
532 * A positive number for a TPM error.
533 */
534 ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
535 const void *buf, size_t bufsiz,
536 size_t min_rsp_body_length, unsigned int flags,
537 const char *desc)
538 {
539 const struct tpm_output_header *header = buf;
540 int err;
541 ssize_t len;
542
543 len = tpm_transmit(chip, space, (u8 *)buf, bufsiz, flags);
544 if (len < 0)
545 return len;
546
547 err = be32_to_cpu(header->return_code);
548 if (err != 0 && desc)
549 dev_err(&chip->dev, "A TPM error (%d) occurred %s\n", err,
550 desc);
551 if (err)
552 return err;
553
554 if (len < min_rsp_body_length + TPM_HEADER_SIZE)
555 return -EFAULT;
556
557 return 0;
558 }
559 EXPORT_SYMBOL_GPL(tpm_transmit_cmd);
560
561 #define TPM_ORD_STARTUP 153
562 #define TPM_ST_CLEAR 1
563
564 /**
565 * tpm_startup - turn on the TPM
566 * @chip: TPM chip to use
567 *
568 * Normally the firmware should start the TPM. This function is provided as a
569 * workaround if this does not happen. A legal case for this could be for
570 * example when a TPM emulator is used.
571 *
572 * Return: same as tpm_transmit_cmd()
573 */
574 int tpm_startup(struct tpm_chip *chip)
575 {
576 struct tpm_buf buf;
577 int rc;
578
579 dev_info(&chip->dev, "starting up the TPM manually\n");
580
581 if (chip->flags & TPM_CHIP_FLAG_TPM2) {
582 rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_STARTUP);
583 if (rc < 0)
584 return rc;
585
586 tpm_buf_append_u16(&buf, TPM2_SU_CLEAR);
587 } else {
588 rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_STARTUP);
589 if (rc < 0)
590 return rc;
591
592 tpm_buf_append_u16(&buf, TPM_ST_CLEAR);
593 }
594
595 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0,
596 "attempting to start the TPM");
597
598 tpm_buf_destroy(&buf);
599 return rc;
600 }
601
602 #define TPM_DIGEST_SIZE 20
603 #define TPM_RET_CODE_IDX 6
604 #define TPM_INTERNAL_RESULT_SIZE 200
605 #define TPM_ORD_GET_CAP 101
606 #define TPM_ORD_GET_RANDOM 70
607
608 static const struct tpm_input_header tpm_getcap_header = {
609 .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
610 .length = cpu_to_be32(22),
611 .ordinal = cpu_to_be32(TPM_ORD_GET_CAP)
612 };
613
614 ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
615 const char *desc, size_t min_cap_length)
616 {
617 struct tpm_buf buf;
618 int rc;
619
620 rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_CAP);
621 if (rc)
622 return rc;
623
624 if (subcap_id == TPM_CAP_VERSION_1_1 ||
625 subcap_id == TPM_CAP_VERSION_1_2) {
626 tpm_buf_append_u32(&buf, subcap_id);
627 tpm_buf_append_u32(&buf, 0);
628 } else {
629 if (subcap_id == TPM_CAP_FLAG_PERM ||
630 subcap_id == TPM_CAP_FLAG_VOL)
631 tpm_buf_append_u32(&buf, TPM_CAP_FLAG);
632 else
633 tpm_buf_append_u32(&buf, TPM_CAP_PROP);
634
635 tpm_buf_append_u32(&buf, 4);
636 tpm_buf_append_u32(&buf, subcap_id);
637 }
638 rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE,
639 min_cap_length, 0, desc);
640 if (!rc)
641 *cap = *(cap_t *)&buf.data[TPM_HEADER_SIZE + 4];
642
643 tpm_buf_destroy(&buf);
644 return rc;
645 }
646 EXPORT_SYMBOL_GPL(tpm_getcap);
647
648 int tpm_get_timeouts(struct tpm_chip *chip)
649 {
650 cap_t cap;
651 unsigned long timeout_old[4], timeout_chip[4], timeout_eff[4];
652 ssize_t rc;
653
654 if (chip->flags & TPM_CHIP_FLAG_HAVE_TIMEOUTS)
655 return 0;
656
657 if (chip->flags & TPM_CHIP_FLAG_TPM2) {
658 /* Fixed timeouts for TPM2 */
659 chip->timeout_a = msecs_to_jiffies(TPM2_TIMEOUT_A);
660 chip->timeout_b = msecs_to_jiffies(TPM2_TIMEOUT_B);
661 chip->timeout_c = msecs_to_jiffies(TPM2_TIMEOUT_C);
662 chip->timeout_d = msecs_to_jiffies(TPM2_TIMEOUT_D);
663 chip->duration[TPM_SHORT] =
664 msecs_to_jiffies(TPM2_DURATION_SHORT);
665 chip->duration[TPM_MEDIUM] =
666 msecs_to_jiffies(TPM2_DURATION_MEDIUM);
667 chip->duration[TPM_LONG] =
668 msecs_to_jiffies(TPM2_DURATION_LONG);
669
670 chip->flags |= TPM_CHIP_FLAG_HAVE_TIMEOUTS;
671 return 0;
672 }
673
674 rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL,
675 sizeof(cap.timeout));
676 if (rc == TPM_ERR_INVALID_POSTINIT) {
677 if (tpm_startup(chip))
678 return rc;
679
680 rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
681 "attempting to determine the timeouts",
682 sizeof(cap.timeout));
683 }
684
685 if (rc) {
686 dev_err(&chip->dev,
687 "A TPM error (%zd) occurred attempting to determine the timeouts\n",
688 rc);
689 return rc;
690 }
691
692 timeout_old[0] = jiffies_to_usecs(chip->timeout_a);
693 timeout_old[1] = jiffies_to_usecs(chip->timeout_b);
694 timeout_old[2] = jiffies_to_usecs(chip->timeout_c);
695 timeout_old[3] = jiffies_to_usecs(chip->timeout_d);
696 timeout_chip[0] = be32_to_cpu(cap.timeout.a);
697 timeout_chip[1] = be32_to_cpu(cap.timeout.b);
698 timeout_chip[2] = be32_to_cpu(cap.timeout.c);
699 timeout_chip[3] = be32_to_cpu(cap.timeout.d);
700 memcpy(timeout_eff, timeout_chip, sizeof(timeout_eff));
701
702 /*
703 * Provide ability for vendor overrides of timeout values in case
704 * of misreporting.
705 */
706 if (chip->ops->update_timeouts != NULL)
707 chip->timeout_adjusted =
708 chip->ops->update_timeouts(chip, timeout_eff);
709
710 if (!chip->timeout_adjusted) {
711 /* Restore default if chip reported 0 */
712 int i;
713
714 for (i = 0; i < ARRAY_SIZE(timeout_eff); i++) {
715 if (timeout_eff[i])
716 continue;
717
718 timeout_eff[i] = timeout_old[i];
719 chip->timeout_adjusted = true;
720 }
721
722 if (timeout_eff[0] != 0 && timeout_eff[0] < 1000) {
723 /* timeouts in msec rather usec */
724 for (i = 0; i != ARRAY_SIZE(timeout_eff); i++)
725 timeout_eff[i] *= 1000;
726 chip->timeout_adjusted = true;
727 }
728 }
729
730 /* Report adjusted timeouts */
731 if (chip->timeout_adjusted) {
732 dev_info(&chip->dev,
733 HW_ERR "Adjusting reported timeouts: A %lu->%luus B %lu->%luus C %lu->%luus D %lu->%luus\n",
734 timeout_chip[0], timeout_eff[0],
735 timeout_chip[1], timeout_eff[1],
736 timeout_chip[2], timeout_eff[2],
737 timeout_chip[3], timeout_eff[3]);
738 }
739
740 chip->timeout_a = usecs_to_jiffies(timeout_eff[0]);
741 chip->timeout_b = usecs_to_jiffies(timeout_eff[1]);
742 chip->timeout_c = usecs_to_jiffies(timeout_eff[2]);
743 chip->timeout_d = usecs_to_jiffies(timeout_eff[3]);
744
745 rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_DURATION, &cap,
746 "attempting to determine the durations",
747 sizeof(cap.duration));
748 if (rc)
749 return rc;
750
751 chip->duration[TPM_SHORT] =
752 usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_short));
753 chip->duration[TPM_MEDIUM] =
754 usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_medium));
755 chip->duration[TPM_LONG] =
756 usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_long));
757
758 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
759 * value wrong and apparently reports msecs rather than usecs. So we
760 * fix up the resulting too-small TPM_SHORT value to make things work.
761 * We also scale the TPM_MEDIUM and -_LONG values by 1000.
762 */
763 if (chip->duration[TPM_SHORT] < (HZ / 100)) {
764 chip->duration[TPM_SHORT] = HZ;
765 chip->duration[TPM_MEDIUM] *= 1000;
766 chip->duration[TPM_LONG] *= 1000;
767 chip->duration_adjusted = true;
768 dev_info(&chip->dev, "Adjusting TPM timeout parameters.");
769 }
770
771 chip->flags |= TPM_CHIP_FLAG_HAVE_TIMEOUTS;
772 return 0;
773 }
774 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
775
776 #define TPM_ORD_CONTINUE_SELFTEST 83
777 #define CONTINUE_SELFTEST_RESULT_SIZE 10
778
779 static const struct tpm_input_header continue_selftest_header = {
780 .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
781 .length = cpu_to_be32(10),
782 .ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
783 };
784
785 /**
786 * tpm_continue_selftest -- run TPM's selftest
787 * @chip: TPM chip to use
788 *
789 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
790 * a TPM error code.
791 */
792 static int tpm_continue_selftest(struct tpm_chip *chip)
793 {
794 int rc;
795 struct tpm_cmd_t cmd;
796
797 cmd.header.in = continue_selftest_header;
798 rc = tpm_transmit_cmd(chip, NULL, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
799 0, 0, "continue selftest");
800 return rc;
801 }
802
803 #define TPM_ORDINAL_PCRREAD 21
804 #define READ_PCR_RESULT_SIZE 30
805 #define READ_PCR_RESULT_BODY_SIZE 20
806 static const struct tpm_input_header pcrread_header = {
807 .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
808 .length = cpu_to_be32(14),
809 .ordinal = cpu_to_be32(TPM_ORDINAL_PCRREAD)
810 };
811
812 int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
813 {
814 int rc;
815 struct tpm_cmd_t cmd;
816
817 cmd.header.in = pcrread_header;
818 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
819 rc = tpm_transmit_cmd(chip, NULL, &cmd, READ_PCR_RESULT_SIZE,
820 READ_PCR_RESULT_BODY_SIZE, 0,
821 "attempting to read a pcr value");
822
823 if (rc == 0)
824 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
825 TPM_DIGEST_SIZE);
826 return rc;
827 }
828
829 /**
830 * tpm_is_tpm2 - do we a have a TPM2 chip?
831 * @chip: a &struct tpm_chip instance, %NULL for the default chip
832 *
833 * Return:
834 * 1 if we have a TPM2 chip.
835 * 0 if we don't have a TPM2 chip.
836 * A negative number for system errors (errno).
837 */
838 int tpm_is_tpm2(struct tpm_chip *chip)
839 {
840 int rc;
841
842 chip = tpm_chip_find_get(chip);
843 if (!chip)
844 return -ENODEV;
845
846 rc = (chip->flags & TPM_CHIP_FLAG_TPM2) != 0;
847
848 tpm_put_ops(chip);
849
850 return rc;
851 }
852 EXPORT_SYMBOL_GPL(tpm_is_tpm2);
853
854 /**
855 * tpm_pcr_read - read a PCR value from SHA1 bank
856 * @chip: a &struct tpm_chip instance, %NULL for the default chip
857 * @pcr_idx: the PCR to be retrieved
858 * @res_buf: the value of the PCR
859 *
860 * Return: same as with tpm_transmit_cmd()
861 */
862 int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
863 {
864 int rc;
865
866 chip = tpm_chip_find_get(chip);
867 if (!chip)
868 return -ENODEV;
869 if (chip->flags & TPM_CHIP_FLAG_TPM2)
870 rc = tpm2_pcr_read(chip, pcr_idx, res_buf);
871 else
872 rc = tpm_pcr_read_dev(chip, pcr_idx, res_buf);
873 tpm_put_ops(chip);
874 return rc;
875 }
876 EXPORT_SYMBOL_GPL(tpm_pcr_read);
877
878 #define TPM_ORD_PCR_EXTEND 20
879 #define EXTEND_PCR_RESULT_SIZE 34
880 #define EXTEND_PCR_RESULT_BODY_SIZE 20
881 static const struct tpm_input_header pcrextend_header = {
882 .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
883 .length = cpu_to_be32(34),
884 .ordinal = cpu_to_be32(TPM_ORD_PCR_EXTEND)
885 };
886
887 static int tpm1_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash,
888 char *log_msg)
889 {
890 struct tpm_buf buf;
891 int rc;
892
893 rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_PCR_EXTEND);
894 if (rc)
895 return rc;
896
897 tpm_buf_append_u32(&buf, pcr_idx);
898 tpm_buf_append(&buf, hash, TPM_DIGEST_SIZE);
899
900 rc = tpm_transmit_cmd(chip, NULL, buf.data, EXTEND_PCR_RESULT_SIZE,
901 EXTEND_PCR_RESULT_BODY_SIZE, 0, log_msg);
902 tpm_buf_destroy(&buf);
903 return rc;
904 }
905
906 /**
907 * tpm_pcr_extend - extend a PCR value in SHA1 bank.
908 * @chip: a &struct tpm_chip instance, %NULL for the default chip
909 * @pcr_idx: the PCR to be retrieved
910 * @hash: the hash value used to extend the PCR value
911 *
912 * Note: with TPM 2.0 extends also those banks with a known digest size to the
913 * cryto subsystem in order to prevent malicious use of those PCR banks. In the
914 * future we should dynamically determine digest sizes.
915 *
916 * Return: same as with tpm_transmit_cmd()
917 */
918 int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
919 {
920 int rc;
921 struct tpm2_digest digest_list[ARRAY_SIZE(chip->active_banks)];
922 u32 count = 0;
923 int i;
924
925 chip = tpm_chip_find_get(chip);
926 if (!chip)
927 return -ENODEV;
928
929 if (chip->flags & TPM_CHIP_FLAG_TPM2) {
930 memset(digest_list, 0, sizeof(digest_list));
931
932 for (i = 0; i < ARRAY_SIZE(chip->active_banks) &&
933 chip->active_banks[i] != TPM2_ALG_ERROR; i++) {
934 digest_list[i].alg_id = chip->active_banks[i];
935 memcpy(digest_list[i].digest, hash, TPM_DIGEST_SIZE);
936 count++;
937 }
938
939 rc = tpm2_pcr_extend(chip, pcr_idx, count, digest_list);
940 tpm_put_ops(chip);
941 return rc;
942 }
943
944 rc = tpm1_pcr_extend(chip, pcr_idx, hash,
945 "attempting extend a PCR value");
946 tpm_put_ops(chip);
947 return rc;
948 }
949 EXPORT_SYMBOL_GPL(tpm_pcr_extend);
950
951 /**
952 * tpm_do_selftest - have the TPM continue its selftest and wait until it
953 * can receive further commands
954 * @chip: TPM chip to use
955 *
956 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
957 * a TPM error code.
958 */
959 int tpm_do_selftest(struct tpm_chip *chip)
960 {
961 int rc;
962 unsigned int loops;
963 unsigned int delay_msec = 100;
964 unsigned long duration;
965 u8 dummy[TPM_DIGEST_SIZE];
966
967 duration = tpm_calc_ordinal_duration(chip, TPM_ORD_CONTINUE_SELFTEST);
968
969 loops = jiffies_to_msecs(duration) / delay_msec;
970
971 rc = tpm_continue_selftest(chip);
972 /* This may fail if there was no TPM driver during a suspend/resume
973 * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST)
974 */
975 if (rc)
976 return rc;
977
978 do {
979 /* Attempt to read a PCR value */
980 rc = tpm_pcr_read_dev(chip, 0, dummy);
981
982 /* Some buggy TPMs will not respond to tpm_tis_ready() for
983 * around 300ms while the self test is ongoing, keep trying
984 * until the self test duration expires. */
985 if (rc == -ETIME) {
986 dev_info(
987 &chip->dev, HW_ERR
988 "TPM command timed out during continue self test");
989 tpm_msleep(delay_msec);
990 continue;
991 }
992
993 if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
994 dev_info(&chip->dev,
995 "TPM is disabled/deactivated (0x%X)\n", rc);
996 /* TPM is disabled and/or deactivated; driver can
997 * proceed and TPM does handle commands for
998 * suspend/resume correctly
999 */
1000 return 0;
1001 }
1002 if (rc != TPM_WARN_DOING_SELFTEST)
1003 return rc;
1004 tpm_msleep(delay_msec);
1005 } while (--loops > 0);
1006
1007 return rc;
1008 }
1009 EXPORT_SYMBOL_GPL(tpm_do_selftest);
1010
1011 /**
1012 * tpm1_auto_startup - Perform the standard automatic TPM initialization
1013 * sequence
1014 * @chip: TPM chip to use
1015 *
1016 * Returns 0 on success, < 0 in case of fatal error.
1017 */
1018 int tpm1_auto_startup(struct tpm_chip *chip)
1019 {
1020 int rc;
1021
1022 rc = tpm_get_timeouts(chip);
1023 if (rc)
1024 goto out;
1025 rc = tpm_do_selftest(chip);
1026 if (rc) {
1027 dev_err(&chip->dev, "TPM self test failed\n");
1028 goto out;
1029 }
1030
1031 return rc;
1032 out:
1033 if (rc > 0)
1034 rc = -ENODEV;
1035 return rc;
1036 }
1037
1038 /**
1039 * tpm_send - send a TPM command
1040 * @chip: a &struct tpm_chip instance, %NULL for the default chip
1041 * @cmd: a TPM command buffer
1042 * @buflen: the length of the TPM command buffer
1043 *
1044 * Return: same as with tpm_transmit_cmd()
1045 */
1046 int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
1047 {
1048 int rc;
1049
1050 chip = tpm_chip_find_get(chip);
1051 if (!chip)
1052 return -ENODEV;
1053
1054 rc = tpm_transmit_cmd(chip, NULL, cmd, buflen, 0, 0,
1055 "attempting to a send a command");
1056 tpm_put_ops(chip);
1057 return rc;
1058 }
1059 EXPORT_SYMBOL_GPL(tpm_send);
1060
1061 #define TPM_ORD_SAVESTATE 152
1062 #define SAVESTATE_RESULT_SIZE 10
1063
1064 static const struct tpm_input_header savestate_header = {
1065 .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
1066 .length = cpu_to_be32(10),
1067 .ordinal = cpu_to_be32(TPM_ORD_SAVESTATE)
1068 };
1069
1070 /*
1071 * We are about to suspend. Save the TPM state
1072 * so that it can be restored.
1073 */
1074 int tpm_pm_suspend(struct device *dev)
1075 {
1076 struct tpm_chip *chip = dev_get_drvdata(dev);
1077 struct tpm_cmd_t cmd;
1078 int rc, try;
1079
1080 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
1081
1082 if (chip == NULL)
1083 return -ENODEV;
1084
1085 if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED)
1086 return 0;
1087
1088 if (chip->flags & TPM_CHIP_FLAG_TPM2) {
1089 tpm2_shutdown(chip, TPM2_SU_STATE);
1090 return 0;
1091 }
1092
1093 /* for buggy tpm, flush pcrs with extend to selected dummy */
1094 if (tpm_suspend_pcr)
1095 rc = tpm1_pcr_extend(chip, tpm_suspend_pcr, dummy_hash,
1096 "extending dummy pcr before suspend");
1097
1098 /* now do the actual savestate */
1099 for (try = 0; try < TPM_RETRY; try++) {
1100 cmd.header.in = savestate_header;
1101 rc = tpm_transmit_cmd(chip, NULL, &cmd, SAVESTATE_RESULT_SIZE,
1102 0, 0, NULL);
1103
1104 /*
1105 * If the TPM indicates that it is too busy to respond to
1106 * this command then retry before giving up. It can take
1107 * several seconds for this TPM to be ready.
1108 *
1109 * This can happen if the TPM has already been sent the
1110 * SaveState command before the driver has loaded. TCG 1.2
1111 * specification states that any communication after SaveState
1112 * may cause the TPM to invalidate previously saved state.
1113 */
1114 if (rc != TPM_WARN_RETRY)
1115 break;
1116 tpm_msleep(TPM_TIMEOUT_RETRY);
1117 }
1118
1119 if (rc)
1120 dev_err(&chip->dev,
1121 "Error (%d) sending savestate before suspend\n", rc);
1122 else if (try > 0)
1123 dev_warn(&chip->dev, "TPM savestate took %dms\n",
1124 try * TPM_TIMEOUT_RETRY);
1125
1126 return rc;
1127 }
1128 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1129
1130 /*
1131 * Resume from a power safe. The BIOS already restored
1132 * the TPM state.
1133 */
1134 int tpm_pm_resume(struct device *dev)
1135 {
1136 struct tpm_chip *chip = dev_get_drvdata(dev);
1137
1138 if (chip == NULL)
1139 return -ENODEV;
1140
1141 return 0;
1142 }
1143 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1144
1145 #define TPM_GETRANDOM_RESULT_SIZE 18
1146 static const struct tpm_input_header tpm_getrandom_header = {
1147 .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
1148 .length = cpu_to_be32(14),
1149 .ordinal = cpu_to_be32(TPM_ORD_GET_RANDOM)
1150 };
1151
1152 /**
1153 * tpm_get_random() - get random bytes from the TPM's RNG
1154 * @chip: a &struct tpm_chip instance, %NULL for the default chip
1155 * @out: destination buffer for the random bytes
1156 * @max: the max number of bytes to write to @out
1157 *
1158 * Return: same as with tpm_transmit_cmd()
1159 */
1160 int tpm_get_random(struct tpm_chip *chip, u8 *out, size_t max)
1161 {
1162 struct tpm_cmd_t tpm_cmd;
1163 u32 recd, num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA), rlength;
1164 int err, total = 0, retries = 5;
1165 u8 *dest = out;
1166
1167 if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
1168 return -EINVAL;
1169
1170 chip = tpm_chip_find_get(chip);
1171 if (!chip)
1172 return -ENODEV;
1173
1174 if (chip->flags & TPM_CHIP_FLAG_TPM2) {
1175 err = tpm2_get_random(chip, out, max);
1176 tpm_put_ops(chip);
1177 return err;
1178 }
1179
1180 do {
1181 tpm_cmd.header.in = tpm_getrandom_header;
1182 tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
1183
1184 err = tpm_transmit_cmd(chip, NULL, &tpm_cmd,
1185 TPM_GETRANDOM_RESULT_SIZE + num_bytes,
1186 offsetof(struct tpm_getrandom_out,
1187 rng_data),
1188 0, "attempting get random");
1189 if (err)
1190 break;
1191
1192 recd = be32_to_cpu(tpm_cmd.params.getrandom_out.rng_data_len);
1193
1194 rlength = be32_to_cpu(tpm_cmd.header.out.length);
1195 if (rlength < offsetof(struct tpm_getrandom_out, rng_data) +
1196 recd) {
1197 total = -EFAULT;
1198 break;
1199 }
1200 memcpy(dest, tpm_cmd.params.getrandom_out.rng_data, recd);
1201
1202 dest += recd;
1203 total += recd;
1204 num_bytes -= recd;
1205 } while (retries-- && total < max);
1206
1207 tpm_put_ops(chip);
1208 return total ? total : -EIO;
1209 }
1210 EXPORT_SYMBOL_GPL(tpm_get_random);
1211
1212 /**
1213 * tpm_seal_trusted() - seal a trusted key payload
1214 * @chip: a &struct tpm_chip instance, %NULL for the default chip
1215 * @options: authentication values and other options
1216 * @payload: the key data in clear and encrypted form
1217 *
1218 * Note: only TPM 2.0 chip are supported. TPM 1.x implementation is located in
1219 * the keyring subsystem.
1220 *
1221 * Return: same as with tpm_transmit_cmd()
1222 */
1223 int tpm_seal_trusted(struct tpm_chip *chip, struct trusted_key_payload *payload,
1224 struct trusted_key_options *options)
1225 {
1226 int rc;
1227
1228 chip = tpm_chip_find_get(chip);
1229 if (!chip || !(chip->flags & TPM_CHIP_FLAG_TPM2))
1230 return -ENODEV;
1231
1232 rc = tpm2_seal_trusted(chip, payload, options);
1233
1234 tpm_put_ops(chip);
1235 return rc;
1236 }
1237 EXPORT_SYMBOL_GPL(tpm_seal_trusted);
1238
1239 /**
1240 * tpm_unseal_trusted() - unseal a trusted key
1241 * @chip: a &struct tpm_chip instance, %NULL for the default chip
1242 * @options: authentication values and other options
1243 * @payload: the key data in clear and encrypted form
1244 *
1245 * Note: only TPM 2.0 chip are supported. TPM 1.x implementation is located in
1246 * the keyring subsystem.
1247 *
1248 * Return: same as with tpm_transmit_cmd()
1249 */
1250 int tpm_unseal_trusted(struct tpm_chip *chip,
1251 struct trusted_key_payload *payload,
1252 struct trusted_key_options *options)
1253 {
1254 int rc;
1255
1256 chip = tpm_chip_find_get(chip);
1257 if (!chip || !(chip->flags & TPM_CHIP_FLAG_TPM2))
1258 return -ENODEV;
1259
1260 rc = tpm2_unseal_trusted(chip, payload, options);
1261
1262 tpm_put_ops(chip);
1263
1264 return rc;
1265 }
1266 EXPORT_SYMBOL_GPL(tpm_unseal_trusted);
1267
1268 static int __init tpm_init(void)
1269 {
1270 int rc;
1271
1272 tpm_class = class_create(THIS_MODULE, "tpm");
1273 if (IS_ERR(tpm_class)) {
1274 pr_err("couldn't create tpm class\n");
1275 return PTR_ERR(tpm_class);
1276 }
1277
1278 tpmrm_class = class_create(THIS_MODULE, "tpmrm");
1279 if (IS_ERR(tpmrm_class)) {
1280 pr_err("couldn't create tpmrm class\n");
1281 class_destroy(tpm_class);
1282 return PTR_ERR(tpmrm_class);
1283 }
1284
1285 rc = alloc_chrdev_region(&tpm_devt, 0, 2*TPM_NUM_DEVICES, "tpm");
1286 if (rc < 0) {
1287 pr_err("tpm: failed to allocate char dev region\n");
1288 class_destroy(tpmrm_class);
1289 class_destroy(tpm_class);
1290 return rc;
1291 }
1292
1293 return 0;
1294 }
1295
1296 static void __exit tpm_exit(void)
1297 {
1298 idr_destroy(&dev_nums_idr);
1299 class_destroy(tpm_class);
1300 class_destroy(tpmrm_class);
1301 unregister_chrdev_region(tpm_devt, 2*TPM_NUM_DEVICES);
1302 }
1303
1304 subsys_initcall(tpm_init);
1305 module_exit(tpm_exit);
1306
1307 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1308 MODULE_DESCRIPTION("TPM Driver");
1309 MODULE_VERSION("2.0");
1310 MODULE_LICENSE("GPL");
CRIS linux kernel tree