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tpm: Use interface timeouts returned from the TPM
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / char / tpm / tpm.c
CommitLineData
1da177e4
LT		 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 *
8e81cc13 10 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
1da177e4
LT		 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
700d8bdc 22 * calls to msleep.
1da177e4
LT		 23 *
24 */
25
1da177e4 26#include <linux/poll.h>
5a0e3ad6 27#include <linux/slab.h>
d081d470 28#include <linux/mutex.h>
1da177e4 29#include <linux/spinlock.h>
d081d470 30
1da177e4
LT		 31#include "tpm.h"
32
3122a88a
KH		 33enum tpm_const {
34 TPM_MINOR = 224, /* officially assigned */
7f366784 35 TPM_BUFSIZE = 4096,
3122a88a 36 TPM_NUM_DEVICES = 256,
3122a88a 37};
1da177e4 38
9e18ee19
KJH		 39enum tpm_duration {
40 TPM_SHORT = 0,
41 TPM_MEDIUM = 1,
42 TPM_LONG = 2,
43 TPM_UNDEFINED,
44};
45
46#define TPM_MAX_ORDINAL 243
47#define TPM_MAX_PROTECTED_ORDINAL 12
48#define TPM_PROTECTED_ORDINAL_MASK 0xFF
49
9b3056cc
DT		 50/*
51 * Bug workaround - some TPM's don't flush the most
52 * recently changed pcr on suspend, so force the flush
53 * with an extend to the selected _unused_ non-volatile pcr.
54 */
55static int tpm_suspend_pcr;
56module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
57MODULE_PARM_DESC(suspend_pcr,
58 "PCR to use for dummy writes to faciltate flush on suspend.");
59
1da177e4
LT		 60static LIST_HEAD(tpm_chip_list);
61static DEFINE_SPINLOCK(driver_lock);
10685a95 62static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
1da177e4 63
9e18ee19
KJH		 64/*
65 * Array with one entry per ordinal defining the maximum amount
66 * of time the chip could take to return the result. The ordinal
67 * designation of short, medium or long is defined in a table in
68 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
69 * values of the SHORT, MEDIUM, and LONG durations are retrieved
70 * from the chip during initialization with a call to tpm_get_timeouts.
71 */
72static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
73 TPM_UNDEFINED, /* 0 */
74 TPM_UNDEFINED,
75 TPM_UNDEFINED,
76 TPM_UNDEFINED,
77 TPM_UNDEFINED,
78 TPM_UNDEFINED, /* 5 */
79 TPM_UNDEFINED,
80 TPM_UNDEFINED,
81 TPM_UNDEFINED,
82 TPM_UNDEFINED,
83 TPM_SHORT, /* 10 */
84 TPM_SHORT,
85};
86
87static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
88 TPM_UNDEFINED, /* 0 */
89 TPM_UNDEFINED,
90 TPM_UNDEFINED,
91 TPM_UNDEFINED,
92 TPM_UNDEFINED,
93 TPM_UNDEFINED, /* 5 */
94 TPM_UNDEFINED,
95 TPM_UNDEFINED,
96 TPM_UNDEFINED,
97 TPM_UNDEFINED,
98 TPM_SHORT, /* 10 */
99 TPM_SHORT,
100 TPM_MEDIUM,
101 TPM_LONG,
102 TPM_LONG,
103 TPM_MEDIUM, /* 15 */
104 TPM_SHORT,
105 TPM_SHORT,
106 TPM_MEDIUM,
107 TPM_LONG,
108 TPM_SHORT, /* 20 */
109 TPM_SHORT,
110 TPM_MEDIUM,
111 TPM_MEDIUM,
112 TPM_MEDIUM,
113 TPM_SHORT, /* 25 */
114 TPM_SHORT,
115 TPM_MEDIUM,
116 TPM_SHORT,
117 TPM_SHORT,
118 TPM_MEDIUM, /* 30 */
119 TPM_LONG,
120 TPM_MEDIUM,
121 TPM_SHORT,
122 TPM_SHORT,
123 TPM_SHORT, /* 35 */
124 TPM_MEDIUM,
125 TPM_MEDIUM,
126 TPM_UNDEFINED,
127 TPM_UNDEFINED,
128 TPM_MEDIUM, /* 40 */
129 TPM_LONG,
130 TPM_MEDIUM,
131 TPM_SHORT,
132 TPM_SHORT,
133 TPM_SHORT, /* 45 */
134 TPM_SHORT,
135 TPM_SHORT,
136 TPM_SHORT,
137 TPM_LONG,
138 TPM_MEDIUM, /* 50 */
139 TPM_MEDIUM,
140 TPM_UNDEFINED,
141 TPM_UNDEFINED,
142 TPM_UNDEFINED,
143 TPM_UNDEFINED, /* 55 */
144 TPM_UNDEFINED,
145 TPM_UNDEFINED,
146 TPM_UNDEFINED,
147 TPM_UNDEFINED,
148 TPM_MEDIUM, /* 60 */
149 TPM_MEDIUM,
150 TPM_MEDIUM,
151 TPM_SHORT,
152 TPM_SHORT,
153 TPM_MEDIUM, /* 65 */
154 TPM_UNDEFINED,
155 TPM_UNDEFINED,
156 TPM_UNDEFINED,
157 TPM_UNDEFINED,
158 TPM_SHORT, /* 70 */
159 TPM_SHORT,
160 TPM_UNDEFINED,
161 TPM_UNDEFINED,
162 TPM_UNDEFINED,
163 TPM_UNDEFINED, /* 75 */
164 TPM_UNDEFINED,
165 TPM_UNDEFINED,
166 TPM_UNDEFINED,
167 TPM_UNDEFINED,
168 TPM_LONG, /* 80 */
169 TPM_UNDEFINED,
170 TPM_MEDIUM,
171 TPM_LONG,
172 TPM_SHORT,
173 TPM_UNDEFINED, /* 85 */
174 TPM_UNDEFINED,
175 TPM_UNDEFINED,
176 TPM_UNDEFINED,
177 TPM_UNDEFINED,
178 TPM_SHORT, /* 90 */
179 TPM_SHORT,
180 TPM_SHORT,
181 TPM_SHORT,
182 TPM_SHORT,
183 TPM_UNDEFINED, /* 95 */
184 TPM_UNDEFINED,
185 TPM_UNDEFINED,
186 TPM_UNDEFINED,
187 TPM_UNDEFINED,
188 TPM_MEDIUM, /* 100 */
189 TPM_SHORT,
190 TPM_SHORT,
191 TPM_UNDEFINED,
192 TPM_UNDEFINED,
193 TPM_UNDEFINED, /* 105 */
194 TPM_UNDEFINED,
195 TPM_UNDEFINED,
196 TPM_UNDEFINED,
197 TPM_UNDEFINED,
198 TPM_SHORT, /* 110 */
199 TPM_SHORT,
200 TPM_SHORT,
201 TPM_SHORT,
202 TPM_SHORT,
203 TPM_SHORT, /* 115 */
204 TPM_SHORT,
205 TPM_SHORT,
206 TPM_UNDEFINED,
207 TPM_UNDEFINED,
208 TPM_LONG, /* 120 */
209 TPM_LONG,
210 TPM_MEDIUM,
211 TPM_UNDEFINED,
212 TPM_SHORT,
213 TPM_SHORT, /* 125 */
214 TPM_SHORT,
215 TPM_LONG,
216 TPM_SHORT,
217 TPM_SHORT,
218 TPM_SHORT, /* 130 */
219 TPM_MEDIUM,
220 TPM_UNDEFINED,
221 TPM_SHORT,
222 TPM_MEDIUM,
223 TPM_UNDEFINED, /* 135 */
224 TPM_UNDEFINED,
225 TPM_UNDEFINED,
226 TPM_UNDEFINED,
227 TPM_UNDEFINED,
228 TPM_SHORT, /* 140 */
229 TPM_SHORT,
230 TPM_UNDEFINED,
231 TPM_UNDEFINED,
232 TPM_UNDEFINED,
233 TPM_UNDEFINED, /* 145 */
234 TPM_UNDEFINED,
235 TPM_UNDEFINED,
236 TPM_UNDEFINED,
237 TPM_UNDEFINED,
238 TPM_SHORT, /* 150 */
239 TPM_MEDIUM,
240 TPM_MEDIUM,
241 TPM_SHORT,
242 TPM_SHORT,
243 TPM_UNDEFINED, /* 155 */
244 TPM_UNDEFINED,
245 TPM_UNDEFINED,
246 TPM_UNDEFINED,
247 TPM_UNDEFINED,
248 TPM_SHORT, /* 160 */
249 TPM_SHORT,
250 TPM_SHORT,
251 TPM_SHORT,
252 TPM_UNDEFINED,
253 TPM_UNDEFINED, /* 165 */
254 TPM_UNDEFINED,
255 TPM_UNDEFINED,
256 TPM_UNDEFINED,
257 TPM_UNDEFINED,
258 TPM_LONG, /* 170 */
259 TPM_UNDEFINED,
260 TPM_UNDEFINED,
261 TPM_UNDEFINED,
262 TPM_UNDEFINED,
263 TPM_UNDEFINED, /* 175 */
264 TPM_UNDEFINED,
265 TPM_UNDEFINED,
266 TPM_UNDEFINED,
267 TPM_UNDEFINED,
268 TPM_MEDIUM, /* 180 */
269 TPM_SHORT,
270 TPM_MEDIUM,
271 TPM_MEDIUM,
272 TPM_MEDIUM,
273 TPM_MEDIUM, /* 185 */
274 TPM_SHORT,
275 TPM_UNDEFINED,
276 TPM_UNDEFINED,
277 TPM_UNDEFINED,
278 TPM_UNDEFINED, /* 190 */
279 TPM_UNDEFINED,
280 TPM_UNDEFINED,
281 TPM_UNDEFINED,
282 TPM_UNDEFINED,
283 TPM_UNDEFINED, /* 195 */
284 TPM_UNDEFINED,
285 TPM_UNDEFINED,
286 TPM_UNDEFINED,
287 TPM_UNDEFINED,
288 TPM_SHORT, /* 200 */
289 TPM_UNDEFINED,
290 TPM_UNDEFINED,
291 TPM_UNDEFINED,
292 TPM_SHORT,
293 TPM_SHORT, /* 205 */
294 TPM_SHORT,
295 TPM_SHORT,
296 TPM_SHORT,
297 TPM_SHORT,
298 TPM_MEDIUM, /* 210 */
299 TPM_UNDEFINED,
300 TPM_MEDIUM,
301 TPM_MEDIUM,
302 TPM_MEDIUM,
303 TPM_UNDEFINED, /* 215 */
304 TPM_MEDIUM,
305 TPM_UNDEFINED,
306 TPM_UNDEFINED,
307 TPM_SHORT,
308 TPM_SHORT, /* 220 */
309 TPM_SHORT,
310 TPM_SHORT,
311 TPM_SHORT,
312 TPM_SHORT,
313 TPM_UNDEFINED, /* 225 */
314 TPM_UNDEFINED,
315 TPM_UNDEFINED,
316 TPM_UNDEFINED,
317 TPM_UNDEFINED,
318 TPM_SHORT, /* 230 */
319 TPM_LONG,
320 TPM_MEDIUM,
321 TPM_UNDEFINED,
322 TPM_UNDEFINED,
323 TPM_UNDEFINED, /* 235 */
324 TPM_UNDEFINED,
325 TPM_UNDEFINED,
326 TPM_UNDEFINED,
327 TPM_UNDEFINED,
328 TPM_SHORT, /* 240 */
329 TPM_UNDEFINED,
330 TPM_MEDIUM,
331};
332
1da177e4
LT		 333static void user_reader_timeout(unsigned long ptr)
334{
335 struct tpm_chip *chip = (struct tpm_chip *) ptr;
336
09e12f9f
KJH		 337 schedule_work(&chip->work);
338}
339
c4028958 340static void timeout_work(struct work_struct *work)
09e12f9f 341{
c4028958 342 struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
09e12f9f 343
d081d470 344 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 345 atomic_set(&chip->data_pending, 0);
346 memset(chip->data_buffer, 0, TPM_BUFSIZE);
d081d470 347 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 348}
349
9e18ee19
KJH		 350/*
351 * Returns max number of jiffies to wait
352 */
353unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
354 u32 ordinal)
355{
356 int duration_idx = TPM_UNDEFINED;
357 int duration = 0;
358
359 if (ordinal < TPM_MAX_ORDINAL)
360 duration_idx = tpm_ordinal_duration[ordinal];
361 else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
362 TPM_MAX_PROTECTED_ORDINAL)
363 duration_idx =
364 tpm_protected_ordinal_duration[ordinal &
365 TPM_PROTECTED_ORDINAL_MASK];
366
8d1dc20e 367 if (duration_idx != TPM_UNDEFINED)
36b20020 368 duration = chip->vendor.duration[duration_idx];
8d1dc20e 369 if (duration <= 0)
9e18ee19 370 return 2 * 60 * HZ;
8d1dc20e
LT		 371 else
372 return duration;
9e18ee19
KJH		 373}
374EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
375
1da177e4
LT		 376/*
377 * Internal kernel interface to transmit TPM commands
378 */
379static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
380 size_t bufsiz)
381{
d9e5b6bf 382 ssize_t rc;
9e18ee19 383 u32 count, ordinal;
700d8bdc 384 unsigned long stop;
1da177e4 385
81179bb6 386 count = be32_to_cpu(*((__be32 *) (buf + 2)));
9e18ee19 387 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
1da177e4
LT		 388 if (count == 0)
389 return -ENODATA;
390 if (count > bufsiz) {
e659a3fe 391 dev_err(chip->dev,
b76be681 392 "invalid count value %x %zx \n", count, bufsiz);
1da177e4
LT		 393 return -E2BIG;
394 }
395
d081d470 396 mutex_lock(&chip->tpm_mutex);
1da177e4 397
90dda520 398 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
e659a3fe 399 dev_err(chip->dev,
d9e5b6bf
KH		 400 "tpm_transmit: tpm_send: error %zd\n", rc);
401 goto out;
1da177e4
LT		 402 }
403
27084efe
LD		 404 if (chip->vendor.irq)
405 goto out_recv;
406
9e18ee19 407 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
1da177e4 408 do {
90dda520
KJH		 409 u8 status = chip->vendor.status(chip);
410 if ((status & chip->vendor.req_complete_mask) ==
411 chip->vendor.req_complete_val)
1da177e4 412 goto out_recv;
d9e5b6bf 413
90dda520 414 if ((status == chip->vendor.req_canceled)) {
e659a3fe 415 dev_err(chip->dev, "Operation Canceled\n");
d9e5b6bf
KH		 416 rc = -ECANCELED;
417 goto out;
418 }
419
420 msleep(TPM_TIMEOUT); /* CHECK */
1da177e4 421 rmb();
700d8bdc 422 } while (time_before(jiffies, stop));
1da177e4 423
90dda520 424 chip->vendor.cancel(chip);
e659a3fe 425 dev_err(chip->dev, "Operation Timed out\n");
d9e5b6bf
KH		 426 rc = -ETIME;
427 goto out;
1da177e4
LT		 428
429out_recv:
90dda520 430 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
d9e5b6bf 431 if (rc < 0)
e659a3fe 432 dev_err(chip->dev,
d9e5b6bf
KH		 433 "tpm_transmit: tpm_recv: error %zd\n", rc);
434out:
d081d470 435 mutex_unlock(&chip->tpm_mutex);
d9e5b6bf 436 return rc;
1da177e4
LT		 437}
438
439#define TPM_DIGEST_SIZE 20
beed53a1
KJH		 440#define TPM_ERROR_SIZE 10
441#define TPM_RET_CODE_IDX 6
beed53a1
KJH		 442
443enum tpm_capabilities {
08837438
RA		 444 TPM_CAP_FLAG = cpu_to_be32(4),
445 TPM_CAP_PROP = cpu_to_be32(5),
446 CAP_VERSION_1_1 = cpu_to_be32(0x06),
447 CAP_VERSION_1_2 = cpu_to_be32(0x1A)
beed53a1
KJH		 448};
449
450enum tpm_sub_capabilities {
08837438
RA		 451 TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
452 TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
453 TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
454 TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
455 TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
456 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
457 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
beed53a1 458
1da177e4
LT		 459};
460
08837438
RA		 461static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
462 int len, const char *desc)
beed53a1
KJH		 463{
464 int err;
465
08837438 466 len = tpm_transmit(chip,(u8 *) cmd, len);
beed53a1
KJH		 467 if (len < 0)
468 return len;
469 if (len == TPM_ERROR_SIZE) {
08837438 470 err = be32_to_cpu(cmd->header.out.return_code);
beed53a1
KJH		 471 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
472 return err;
473 }
474 return 0;
475}
476
08837438
RA		 477#define TPM_INTERNAL_RESULT_SIZE 200
478#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
479#define TPM_ORD_GET_CAP cpu_to_be32(101)
480
481static const struct tpm_input_header tpm_getcap_header = {
482 .tag = TPM_TAG_RQU_COMMAND,
483 .length = cpu_to_be32(22),
484 .ordinal = TPM_ORD_GET_CAP
485};
486
487ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
488 const char *desc)
489{
490 struct tpm_cmd_t tpm_cmd;
491 int rc;
492 struct tpm_chip *chip = dev_get_drvdata(dev);
493
494 tpm_cmd.header.in = tpm_getcap_header;
495 if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
496 tpm_cmd.params.getcap_in.cap = subcap_id;
497 /*subcap field not necessary */
498 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
499 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
500 } else {
501 if (subcap_id == TPM_CAP_FLAG_PERM ||
502 subcap_id == TPM_CAP_FLAG_VOL)
503 tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
504 else
505 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
506 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
507 tpm_cmd.params.getcap_in.subcap = subcap_id;
508 }
509 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
510 if (!rc)
511 *cap = tpm_cmd.params.getcap_out.cap;
512 return rc;
513}
514
08e96e48
KJH		 515void tpm_gen_interrupt(struct tpm_chip *chip)
516{
08837438 517 struct tpm_cmd_t tpm_cmd;
08e96e48
KJH		 518 ssize_t rc;
519
08837438
RA		 520 tpm_cmd.header.in = tpm_getcap_header;
521 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
522 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
523 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 524
08837438 525 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 526 "attempting to determine the timeouts");
527}
528EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
529
530void tpm_get_timeouts(struct tpm_chip *chip)
531{
08837438
RA		 532 struct tpm_cmd_t tpm_cmd;
533 struct timeout_t *timeout_cap;
534 struct duration_t *duration_cap;
08e96e48
KJH		 535 ssize_t rc;
536 u32 timeout;
537
08837438
RA		 538 tpm_cmd.header.in = tpm_getcap_header;
539 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
540 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
541 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 542
08837438 543 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 544 "attempting to determine the timeouts");
545 if (rc)
546 goto duration;
547
829bf067
SB		 548 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
549 be32_to_cpu(tpm_cmd.header.out.length)
550 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
551 return;
08e96e48 552
08837438 553 timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
08e96e48 554 /* Don't overwrite default if value is 0 */
08837438 555 timeout = be32_to_cpu(timeout_cap->a);
08e96e48 556 if (timeout)
9e5b1b12 557 chip->vendor.timeout_a = usecs_to_jiffies(timeout);
08837438 558 timeout = be32_to_cpu(timeout_cap->b);
08e96e48 559 if (timeout)
9e5b1b12 560 chip->vendor.timeout_b = usecs_to_jiffies(timeout);
08837438 561 timeout = be32_to_cpu(timeout_cap->c);
08e96e48 562 if (timeout)
9e5b1b12 563 chip->vendor.timeout_c = usecs_to_jiffies(timeout);
08837438 564 timeout = be32_to_cpu(timeout_cap->d);
08e96e48 565 if (timeout)
9e5b1b12 566 chip->vendor.timeout_d = usecs_to_jiffies(timeout);
08e96e48
KJH		 567
568duration:
08837438
RA		 569 tpm_cmd.header.in = tpm_getcap_header;
570 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
571 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
572 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
08e96e48 573
08837438 574 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 575 "attempting to determine the durations");
576 if (rc)
577 return;
578
979b1406
SB		 579 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
580 be32_to_cpu(tpm_cmd.header.out.length)
581 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
08e96e48 582 return;
979b1406 583
08837438 584 duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
08e96e48 585 chip->vendor.duration[TPM_SHORT] =
08837438 586 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
e934acca
SB		 587 chip->vendor.duration[TPM_MEDIUM] =
588 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
589 chip->vendor.duration[TPM_LONG] =
590 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
591
292cf4a8
VK		 592 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
593 * value wrong and apparently reports msecs rather than usecs. So we
594 * fix up the resulting too-small TPM_SHORT value to make things work.
e934acca 595 * We also scale the TPM_MEDIUM and -_LONG values by 1000.
292cf4a8 596 */
e934acca 597 if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
292cf4a8 598 chip->vendor.duration[TPM_SHORT] = HZ;
e934acca
SB		 599 chip->vendor.duration[TPM_MEDIUM] *= 1000;
600 chip->vendor.duration[TPM_LONG] *= 1000;
04ab2293 601 chip->vendor.duration_adjusted = true;
e934acca
SB		 602 dev_info(chip->dev, "Adjusting TPM timeout parameters.");
603 }
08e96e48
KJH		 604}
605EXPORT_SYMBOL_GPL(tpm_get_timeouts);
606
607void tpm_continue_selftest(struct tpm_chip *chip)
608{
609 u8 data[] = {
610 0, 193, /* TPM_TAG_RQU_COMMAND */
611 0, 0, 0, 10, /* length */
612 0, 0, 0, 83, /* TPM_ORD_GetCapability */
613 };
614
615 tpm_transmit(chip, data, sizeof(data));
616}
617EXPORT_SYMBOL_GPL(tpm_continue_selftest);
618
619ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
620 char *buf)
621{
08837438 622 cap_t cap;
08e96e48
KJH		 623 ssize_t rc;
624
08837438
RA		 625 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
626 "attempting to determine the permanent enabled state");
627 if (rc)
08e96e48 628 return 0;
ec288bd3 629
08837438 630 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
ec288bd3 631 return rc;
08e96e48
KJH		 632}
633EXPORT_SYMBOL_GPL(tpm_show_enabled);
634
635ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
636 char *buf)
637{
08837438 638 cap_t cap;
08e96e48
KJH		 639 ssize_t rc;
640
08837438
RA		 641 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
642 "attempting to determine the permanent active state");
643 if (rc)
08e96e48 644 return 0;
ec288bd3 645
08837438 646 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
ec288bd3 647 return rc;
08e96e48
KJH		 648}
649EXPORT_SYMBOL_GPL(tpm_show_active);
650
651ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
652 char *buf)
653{
08837438 654 cap_t cap;
08e96e48
KJH		 655 ssize_t rc;
656
08837438
RA		 657 rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
658 "attempting to determine the owner state");
659 if (rc)
08e96e48 660 return 0;
ec288bd3 661
08837438 662 rc = sprintf(buf, "%d\n", cap.owned);
ec288bd3 663 return rc;
08e96e48
KJH		 664}
665EXPORT_SYMBOL_GPL(tpm_show_owned);
666
667ssize_t tpm_show_temp_deactivated(struct device * dev,
668 struct device_attribute * attr, char *buf)
669{
08837438 670 cap_t cap;
08e96e48
KJH		 671 ssize_t rc;
672
08837438
RA		 673 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
674 "attempting to determine the temporary state");
675 if (rc)
08e96e48 676 return 0;
ec288bd3 677
08837438 678 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
ec288bd3 679 return rc;
08e96e48
KJH		 680}
681EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
682
659aaf2b
RA		 683/*
684 * tpm_chip_find_get - return tpm_chip for given chip number
685 */
686static struct tpm_chip *tpm_chip_find_get(int chip_num)
687{
8920d5ad 688 struct tpm_chip *pos, *chip = NULL;
659aaf2b
RA		 689
690 rcu_read_lock();
691 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
692 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
693 continue;
694
8920d5ad
RA		 695 if (try_module_get(pos->dev->driver->owner)) {
696 chip = pos;
659aaf2b 697 break;
8920d5ad 698 }
659aaf2b
RA		 699 }
700 rcu_read_unlock();
8920d5ad 701 return chip;
659aaf2b
RA		 702}
703
704#define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
705#define READ_PCR_RESULT_SIZE 30
706static struct tpm_input_header pcrread_header = {
707 .tag = TPM_TAG_RQU_COMMAND,
708 .length = cpu_to_be32(14),
709 .ordinal = TPM_ORDINAL_PCRREAD
1da177e4
LT		 710};
711
659aaf2b
RA		 712int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
713{
714 int rc;
715 struct tpm_cmd_t cmd;
716
717 cmd.header.in = pcrread_header;
718 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
23acb98d 719 rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
659aaf2b
RA		 720 "attempting to read a pcr value");
721
722 if (rc == 0)
723 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
724 TPM_DIGEST_SIZE);
725 return rc;
726}
727
728/**
729 * tpm_pcr_read - read a pcr value
730 * @chip_num: tpm idx # or ANY
731 * @pcr_idx: pcr idx to retrieve
732 * @res_buf: TPM_PCR value
733 * size of res_buf is 20 bytes (or NULL if you don't care)
734 *
735 * The TPM driver should be built-in, but for whatever reason it
736 * isn't, protect against the chip disappearing, by incrementing
737 * the module usage count.
738 */
739int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
740{
741 struct tpm_chip *chip;
742 int rc;
743
744 chip = tpm_chip_find_get(chip_num);
745 if (chip == NULL)
746 return -ENODEV;
747 rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
a0e39349 748 tpm_chip_put(chip);
659aaf2b
RA		 749 return rc;
750}
751EXPORT_SYMBOL_GPL(tpm_pcr_read);
752
753/**
754 * tpm_pcr_extend - extend pcr value with hash
755 * @chip_num: tpm idx # or AN&
756 * @pcr_idx: pcr idx to extend
757 * @hash: hash value used to extend pcr value
758 *
759 * The TPM driver should be built-in, but for whatever reason it
760 * isn't, protect against the chip disappearing, by incrementing
761 * the module usage count.
762 */
763#define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
0afd9056 764#define EXTEND_PCR_RESULT_SIZE 34
659aaf2b
RA		 765static struct tpm_input_header pcrextend_header = {
766 .tag = TPM_TAG_RQU_COMMAND,
767 .length = cpu_to_be32(34),
768 .ordinal = TPM_ORD_PCR_EXTEND
769};
770
771int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
772{
773 struct tpm_cmd_t cmd;
774 int rc;
775 struct tpm_chip *chip;
776
777 chip = tpm_chip_find_get(chip_num);
778 if (chip == NULL)
779 return -ENODEV;
780
781 cmd.header.in = pcrextend_header;
659aaf2b
RA		 782 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
783 memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
0afd9056 784 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
659aaf2b
RA		 785 "attempting extend a PCR value");
786
a0e39349 787 tpm_chip_put(chip);
659aaf2b
RA		 788 return rc;
789}
790EXPORT_SYMBOL_GPL(tpm_pcr_extend);
791
c749ba91
MZ		 792int tpm_send(u32 chip_num, void *cmd, size_t buflen)
793{
794 struct tpm_chip *chip;
795 int rc;
796
797 chip = tpm_chip_find_get(chip_num);
798 if (chip == NULL)
799 return -ENODEV;
800
801 rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
802
803 tpm_chip_put(chip);
804 return rc;
805}
806EXPORT_SYMBOL_GPL(tpm_send);
807
6659ca2a
KH		 808ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
809 char *buf)
1da177e4 810{
08837438 811 cap_t cap;
659aaf2b 812 u8 digest[TPM_DIGEST_SIZE];
beed53a1 813 ssize_t rc;
81179bb6 814 int i, j, num_pcrs;
1da177e4 815 char *str = buf;
e659a3fe 816 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 817
08837438 818 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
beed53a1 819 "attempting to determine the number of PCRS");
08837438 820 if (rc)
e234bc97 821 return 0;
1da177e4 822
08837438 823 num_pcrs = be32_to_cpu(cap.num_pcrs);
1da177e4 824 for (i = 0; i < num_pcrs; i++) {
659aaf2b 825 rc = __tpm_pcr_read(chip, i, digest);
beed53a1 826 if (rc)
08837438 827 break;
1da177e4
LT		 828 str += sprintf(str, "PCR-%02d: ", i);
829 for (j = 0; j < TPM_DIGEST_SIZE; j++)
659aaf2b 830 str += sprintf(str, "%02X ", digest[j]);
1da177e4
LT		 831 str += sprintf(str, "\n");
832 }
833 return str - buf;
834}
6659ca2a 835EXPORT_SYMBOL_GPL(tpm_show_pcrs);
1da177e4
LT		 836
837#define READ_PUBEK_RESULT_SIZE 314
08837438
RA		 838#define TPM_ORD_READPUBEK cpu_to_be32(124)
839struct tpm_input_header tpm_readpubek_header = {
840 .tag = TPM_TAG_RQU_COMMAND,
841 .length = cpu_to_be32(30),
842 .ordinal = TPM_ORD_READPUBEK
1da177e4
LT		 843};
844
6659ca2a
KH		 845ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
846 char *buf)
1da177e4 847{
2df7111f 848 u8 *data;
08837438 849 struct tpm_cmd_t tpm_cmd;
beed53a1 850 ssize_t err;
81179bb6 851 int i, rc;
1da177e4
LT		 852 char *str = buf;
853
e659a3fe 854 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 855
08837438
RA		 856 tpm_cmd.header.in = tpm_readpubek_header;
857 err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
beed53a1
KJH		 858 "attempting to read the PUBEK");
859 if (err)
34d6e075 860 goto out;
1da177e4
LT		 861
862 /*
863 ignore header 10 bytes
864 algorithm 32 bits (1 == RSA )
865 encscheme 16 bits
866 sigscheme 16 bits
867 parameters (RSA 12->bytes: keybit, #primes, expbit)
868 keylenbytes 32 bits
869 256 byte modulus
870 ignore checksum 20 bytes
871 */
08837438 872 data = tpm_cmd.params.readpubek_out_buffer;
1da177e4
LT		 873 str +=
874 sprintf(str,
875 "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
876 "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
877 " %02X %02X %02X %02X %02X %02X %02X %02X\n"
878 "Modulus length: %d\nModulus: \n",
879 data[10], data[11], data[12], data[13], data[14],
880 data[15], data[16], data[17], data[22], data[23],
881 data[24], data[25], data[26], data[27], data[28],
882 data[29], data[30], data[31], data[32], data[33],
1dda8abe 883 be32_to_cpu(*((__be32 *) (data + 34))));
1da177e4
LT		 884
885 for (i = 0; i < 256; i++) {
1dda8abe 886 str += sprintf(str, "%02X ", data[i + 38]);
1da177e4
LT		 887 if ((i + 1) % 16 == 0)
888 str += sprintf(str, "\n");
889 }
34d6e075 890out:
beed53a1 891 rc = str - buf;
2df7111f 892 return rc;
1da177e4 893}
6659ca2a 894EXPORT_SYMBOL_GPL(tpm_show_pubek);
1da177e4 895
1da177e4 896
6659ca2a
KH		 897ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
898 char *buf)
1da177e4 899{
08837438 900 cap_t cap;
beed53a1 901 ssize_t rc;
1da177e4
LT		 902 char *str = buf;
903
08837438 904 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
beed53a1 905 "attempting to determine the manufacturer");
08837438 906 if (rc)
beed53a1 907 return 0;
1da177e4 908 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438 909 be32_to_cpu(cap.manufacturer_id));
1da177e4 910
08837438
RA		 911 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
912 "attempting to determine the 1.1 version");
beed53a1 913 if (rc)
08837438 914 return 0;
beed53a1
KJH		 915 str += sprintf(str,
916 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 917 cap.tpm_version.Major, cap.tpm_version.Minor,
918 cap.tpm_version.revMajor, cap.tpm_version.revMinor);
1da177e4
LT		 919 return str - buf;
920}
6659ca2a
KH		 921EXPORT_SYMBOL_GPL(tpm_show_caps);
922
08e96e48
KJH		 923ssize_t tpm_show_caps_1_2(struct device * dev,
924 struct device_attribute * attr, char *buf)
925{
08837438
RA		 926 cap_t cap;
927 ssize_t rc;
08e96e48
KJH		 928 char *str = buf;
929
08837438
RA		 930 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
931 "attempting to determine the manufacturer");
932 if (rc)
08e96e48 933 return 0;
08e96e48 934 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438
RA		 935 be32_to_cpu(cap.manufacturer_id));
936 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
937 "attempting to determine the 1.2 version");
938 if (rc)
939 return 0;
08e96e48
KJH		 940 str += sprintf(str,
941 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 942 cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
943 cap.tpm_version_1_2.revMajor,
944 cap.tpm_version_1_2.revMinor);
08e96e48
KJH		 945 return str - buf;
946}
947EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
948
04ab2293
SB		 949ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
950 char *buf)
951{
952 struct tpm_chip *chip = dev_get_drvdata(dev);
953
954 return sprintf(buf, "%d %d %d [%s]\n",
955 jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
956 jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
957 jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
958 chip->vendor.duration_adjusted
959 ? "adjusted" : "original");
960}
961EXPORT_SYMBOL_GPL(tpm_show_durations);
962
6659ca2a
KH		 963ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
964 const char *buf, size_t count)
965{
966 struct tpm_chip *chip = dev_get_drvdata(dev);
967 if (chip == NULL)
968 return 0;
969
90dda520 970 chip->vendor.cancel(chip);
6659ca2a
KH		 971 return count;
972}
973EXPORT_SYMBOL_GPL(tpm_store_cancel);
1da177e4 974
1da177e4
LT		 975/*
976 * Device file system interface to the TPM
f89c5edb
RA		 977 *
978 * It's assured that the chip will be opened just once,
979 * by the check of is_open variable, which is protected
980 * by driver_lock.
1da177e4
LT		 981 */
982int tpm_open(struct inode *inode, struct file *file)
983{
f02a9364 984 int minor = iminor(inode);
1da177e4
LT		 985 struct tpm_chip *chip = NULL, *pos;
986
f02a9364
RA		 987 rcu_read_lock();
988 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
90dda520 989 if (pos->vendor.miscdev.minor == minor) {
1da177e4 990 chip = pos;
f02a9364 991 get_device(chip->dev);
1da177e4
LT		 992 break;
993 }
994 }
f02a9364 995 rcu_read_unlock();
1da177e4 996
f02a9364
RA		 997 if (!chip)
998 return -ENODEV;
1da177e4 999
dc36d32c 1000 if (test_and_set_bit(0, &chip->is_open)) {
b888c87b 1001 dev_dbg(chip->dev, "Another process owns this TPM\n");
f02a9364
RA		 1002 put_device(chip->dev);
1003 return -EBUSY;
1da177e4
LT		 1004 }
1005
1309d7af 1006 chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
1da177e4 1007 if (chip->data_buffer == NULL) {
dc36d32c 1008 clear_bit(0, &chip->is_open);
e659a3fe 1009 put_device(chip->dev);
1da177e4
LT		 1010 return -ENOMEM;
1011 }
1012
1013 atomic_set(&chip->data_pending, 0);
1014
1015 file->private_data = chip;
1016 return 0;
1da177e4 1017}
1da177e4
LT		 1018EXPORT_SYMBOL_GPL(tpm_open);
1019
f02a9364
RA		 1020/*
1021 * Called on file close
1022 */
1da177e4
LT		 1023int tpm_release(struct inode *inode, struct file *file)
1024{
1025 struct tpm_chip *chip = file->private_data;
1da177e4 1026
4bdec11f 1027 del_singleshot_timer_sync(&chip->user_read_timer);
2e5c44c9 1028 flush_work_sync(&chip->work);
5e976d55 1029 file->private_data = NULL;
1da177e4 1030 atomic_set(&chip->data_pending, 0);
f02a9364 1031 kfree(chip->data_buffer);
dc36d32c 1032 clear_bit(0, &chip->is_open);
e659a3fe 1033 put_device(chip->dev);
1da177e4
LT		 1034 return 0;
1035}
1da177e4
LT		 1036EXPORT_SYMBOL_GPL(tpm_release);
1037
b888c87b 1038ssize_t tpm_write(struct file *file, const char __user *buf,
3c2f606a 1039 size_t size, loff_t *off)
1da177e4
LT		 1040{
1041 struct tpm_chip *chip = file->private_data;
01476001 1042 size_t in_size = size, out_size;
1da177e4
LT		 1043
1044 /* cannot perform a write until the read has cleared
1045 either via tpm_read or a user_read_timer timeout */
700d8bdc
NA		 1046 while (atomic_read(&chip->data_pending) != 0)
1047 msleep(TPM_TIMEOUT);
1da177e4 1048
d081d470 1049 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 1050
1051 if (in_size > TPM_BUFSIZE)
1052 in_size = TPM_BUFSIZE;
1053
1054 if (copy_from_user
1055 (chip->data_buffer, (void __user *) buf, in_size)) {
d081d470 1056 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1057 return -EFAULT;
1058 }
1059
1060 /* atomic tpm command send and result receive */
1061 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1062
1063 atomic_set(&chip->data_pending, out_size);
d081d470 1064 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1065
1066 /* Set a timeout by which the reader must come claim the result */
fe3fd483 1067 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1da177e4
LT		 1068
1069 return in_size;
1070}
1da177e4
LT		 1071EXPORT_SYMBOL_GPL(tpm_write);
1072
3c2f606a
KJH		 1073ssize_t tpm_read(struct file *file, char __user *buf,
1074 size_t size, loff_t *off)
1da177e4
LT		 1075{
1076 struct tpm_chip *chip = file->private_data;
01476001 1077 ssize_t ret_size;
1da177e4 1078
5b44bd58 1079 del_singleshot_timer_sync(&chip->user_read_timer);
2e5c44c9 1080 flush_work_sync(&chip->work);
5b44bd58
KH		 1081 ret_size = atomic_read(&chip->data_pending);
1082 atomic_set(&chip->data_pending, 0);
1083 if (ret_size > 0) { /* relay data */
1084 if (size < ret_size)
1085 ret_size = size;
1da177e4 1086
d081d470 1087 mutex_lock(&chip->buffer_mutex);
f6a2382c 1088 if (copy_to_user(buf, chip->data_buffer, ret_size))
5b44bd58 1089 ret_size = -EFAULT;
d081d470 1090 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1091 }
1092
1093 return ret_size;
1094}
1da177e4
LT		 1095EXPORT_SYMBOL_GPL(tpm_read);
1096
e659a3fe 1097void tpm_remove_hardware(struct device *dev)
1da177e4 1098{
e659a3fe 1099 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1100
1101 if (chip == NULL) {
e659a3fe 1102 dev_err(dev, "No device data found\n");
1da177e4
LT		 1103 return;
1104 }
1105
1106 spin_lock(&driver_lock);
f02a9364 1107 list_del_rcu(&chip->list);
1da177e4 1108 spin_unlock(&driver_lock);
f02a9364 1109 synchronize_rcu();
1da177e4 1110
90dda520 1111 misc_deregister(&chip->vendor.miscdev);
90dda520 1112 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
55a82ab3 1113 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1114
5bd91f18
RM		 1115 /* write it this way to be explicit (chip->dev == dev) */
1116 put_device(chip->dev);
1da177e4 1117}
e659a3fe 1118EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4 1119
225a9be2
RA		 1120#define TPM_ORD_SAVESTATE cpu_to_be32(152)
1121#define SAVESTATE_RESULT_SIZE 10
1122
1123static struct tpm_input_header savestate_header = {
1124 .tag = TPM_TAG_RQU_COMMAND,
1125 .length = cpu_to_be32(10),
1126 .ordinal = TPM_ORD_SAVESTATE
1127};
1128
1da177e4
LT		 1129/*
1130 * We are about to suspend. Save the TPM state
1131 * so that it can be restored.
1132 */
ce2c87d4 1133int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1da177e4 1134{
ce2c87d4 1135 struct tpm_chip *chip = dev_get_drvdata(dev);
225a9be2
RA		 1136 struct tpm_cmd_t cmd;
1137 int rc;
1138
1139 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
2490c681 1140
1da177e4
LT		 1141 if (chip == NULL)
1142 return -ENODEV;
1143
225a9be2
RA		 1144 /* for buggy tpm, flush pcrs with extend to selected dummy */
1145 if (tpm_suspend_pcr) {
1146 cmd.header.in = pcrextend_header;
1147 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1148 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1149 TPM_DIGEST_SIZE);
1150 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1151 "extending dummy pcr before suspend");
1152 }
1153
1154 /* now do the actual savestate */
1155 cmd.header.in = savestate_header;
1156 rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
1157 "sending savestate before suspend");
1158 return rc;
1da177e4 1159}
1da177e4
LT		 1160EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1161
1162/*
1163 * Resume from a power safe. The BIOS already restored
1164 * the TPM state.
1165 */
ce2c87d4 1166int tpm_pm_resume(struct device *dev)
1da177e4 1167{
ce2c87d4 1168 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1169
1170 if (chip == NULL)
1171 return -ENODEV;
1172
1da177e4
LT		 1173 return 0;
1174}
1da177e4
LT		 1175EXPORT_SYMBOL_GPL(tpm_pm_resume);
1176
253115b7
RA		 1177/* In case vendor provided release function, call it too.*/
1178
1179void tpm_dev_vendor_release(struct tpm_chip *chip)
1180{
1181 if (chip->vendor.release)
1182 chip->vendor.release(chip->dev);
1183
1184 clear_bit(chip->dev_num, dev_mask);
1185 kfree(chip->vendor.miscdev.name);
1186}
1187EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1188
1189
5bd91f18
RM		 1190/*
1191 * Once all references to platform device are down to 0,
1192 * release all allocated structures.
5bd91f18 1193 */
cbb2ed4a 1194void tpm_dev_release(struct device *dev)
5bd91f18
RM		 1195{
1196 struct tpm_chip *chip = dev_get_drvdata(dev);
1197
253115b7 1198 tpm_dev_vendor_release(chip);
5bd91f18 1199
253115b7 1200 chip->release(dev);
5bd91f18
RM		 1201 kfree(chip);
1202}
253115b7 1203EXPORT_SYMBOL_GPL(tpm_dev_release);
5bd91f18 1204
1da177e4
LT		 1205/*
1206 * Called from tpm_<specific>.c probe function only for devices
1207 * the driver has determined it should claim. Prior to calling
1208 * this function the specific probe function has called pci_enable_device
1209 * upon errant exit from this function specific probe function should call
1210 * pci_disable_device
1211 */
f02a9364
RA		 1212struct tpm_chip *tpm_register_hardware(struct device *dev,
1213 const struct tpm_vendor_specific *entry)
1da177e4 1214{
6f9beccb
KJH		 1215#define DEVNAME_SIZE 7
1216
1217 char *devname;
1da177e4 1218 struct tpm_chip *chip;
1da177e4
LT		 1219
1220 /* Driver specific per-device data */
b888c87b 1221 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
8e39c933
PW		 1222 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1223
dd78c943
AM		 1224 if (chip == NULL || devname == NULL)
1225 goto out_free;
1da177e4 1226
d081d470
MK		 1227 mutex_init(&chip->buffer_mutex);
1228 mutex_init(&chip->tpm_mutex);
1da177e4
LT		 1229 INIT_LIST_HEAD(&chip->list);
1230
c4028958 1231 INIT_WORK(&chip->work, timeout_work);
09e12f9f 1232
40565f19
JS		 1233 setup_timer(&chip->user_read_timer, user_reader_timeout,
1234 (unsigned long)chip);
fe3fd483 1235
90dda520 1236 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4 1237
10685a95 1238 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1da177e4 1239
10685a95 1240 if (chip->dev_num >= TPM_NUM_DEVICES) {
b888c87b 1241 dev_err(dev, "No available tpm device numbers\n");
dd78c943 1242 goto out_free;
1da177e4 1243 } else if (chip->dev_num == 0)
90dda520 1244 chip->vendor.miscdev.minor = TPM_MINOR;
1da177e4 1245 else
90dda520 1246 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1da177e4 1247
10685a95
KJH		 1248 set_bit(chip->dev_num, dev_mask);
1249
6f9beccb 1250 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
90dda520 1251 chip->vendor.miscdev.name = devname;
1da177e4 1252
94fbcded 1253 chip->vendor.miscdev.parent = dev;
e659a3fe 1254 chip->dev = get_device(dev);
5bd91f18
RM		 1255 chip->release = dev->release;
1256 dev->release = tpm_dev_release;
1257 dev_set_drvdata(dev, chip);
1da177e4 1258
90dda520 1259 if (misc_register(&chip->vendor.miscdev)) {
e659a3fe 1260 dev_err(chip->dev,
1da177e4 1261 "unable to misc_register %s, minor %d\n",
90dda520
KJH		 1262 chip->vendor.miscdev.name,
1263 chip->vendor.miscdev.minor);
5bd91f18 1264 put_device(chip->dev);
e0dd03ca 1265 return NULL;
1da177e4
LT		 1266 }
1267
f33d9bd5 1268 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
5d469ec0 1269 misc_deregister(&chip->vendor.miscdev);
5bd91f18 1270 put_device(chip->dev);
f02a9364 1271
f33d9bd5
JG		 1272 return NULL;
1273 }
1da177e4 1274
55a82ab3
KJH		 1275 chip->bios_dir = tpm_bios_log_setup(devname);
1276
f02a9364
RA		 1277 /* Make chip available */
1278 spin_lock(&driver_lock);
1279 list_add_rcu(&chip->list, &tpm_chip_list);
1280 spin_unlock(&driver_lock);
1281
e0dd03ca 1282 return chip;
dd78c943
AM		 1283
1284out_free:
1285 kfree(chip);
1286 kfree(devname);
1287 return NULL;
1da177e4 1288}
1da177e4
LT		 1289EXPORT_SYMBOL_GPL(tpm_register_hardware);
1290
1da177e4
LT		 1291MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1292MODULE_DESCRIPTION("TPM Driver");
1293MODULE_VERSION("2.0");
1294MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)