projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
tpm_tis: Introduce durations sysfs entry
[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
08837438 548 if (be32_to_cpu(tpm_cmd.header.out.length)
08e96e48
KJH		 549 != 4 * sizeof(u32))
550 goto duration;
551
08837438 552 timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
08e96e48 553 /* Don't overwrite default if value is 0 */
08837438 554 timeout = be32_to_cpu(timeout_cap->a);
08e96e48 555 if (timeout)
9e5b1b12 556 chip->vendor.timeout_a = usecs_to_jiffies(timeout);
08837438 557 timeout = be32_to_cpu(timeout_cap->b);
08e96e48 558 if (timeout)
9e5b1b12 559 chip->vendor.timeout_b = usecs_to_jiffies(timeout);
08837438 560 timeout = be32_to_cpu(timeout_cap->c);
08e96e48 561 if (timeout)
9e5b1b12 562 chip->vendor.timeout_c = usecs_to_jiffies(timeout);
08837438 563 timeout = be32_to_cpu(timeout_cap->d);
08e96e48 564 if (timeout)
9e5b1b12 565 chip->vendor.timeout_d = usecs_to_jiffies(timeout);
08e96e48
KJH		 566
567duration:
08837438
RA		 568 tpm_cmd.header.in = tpm_getcap_header;
569 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
570 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
571 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
08e96e48 572
08837438 573 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 574 "attempting to determine the durations");
575 if (rc)
576 return;
577
979b1406
SB		 578 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
579 be32_to_cpu(tpm_cmd.header.out.length)
580 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
08e96e48 581 return;
979b1406 582
08837438 583 duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
08e96e48 584 chip->vendor.duration[TPM_SHORT] =
08837438 585 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
e934acca
SB		 586 chip->vendor.duration[TPM_MEDIUM] =
587 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
588 chip->vendor.duration[TPM_LONG] =
589 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
590
292cf4a8
VK		 591 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
592 * value wrong and apparently reports msecs rather than usecs. So we
593 * fix up the resulting too-small TPM_SHORT value to make things work.
e934acca 594 * We also scale the TPM_MEDIUM and -_LONG values by 1000.
292cf4a8 595 */
e934acca 596 if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
292cf4a8 597 chip->vendor.duration[TPM_SHORT] = HZ;
e934acca
SB		 598 chip->vendor.duration[TPM_MEDIUM] *= 1000;
599 chip->vendor.duration[TPM_LONG] *= 1000;
04ab2293 600 chip->vendor.duration_adjusted = true;
e934acca
SB		 601 dev_info(chip->dev, "Adjusting TPM timeout parameters.");
602 }
08e96e48
KJH		 603}
604EXPORT_SYMBOL_GPL(tpm_get_timeouts);
605
606void tpm_continue_selftest(struct tpm_chip *chip)
607{
608 u8 data[] = {
609 0, 193, /* TPM_TAG_RQU_COMMAND */
610 0, 0, 0, 10, /* length */
611 0, 0, 0, 83, /* TPM_ORD_GetCapability */
612 };
613
614 tpm_transmit(chip, data, sizeof(data));
615}
616EXPORT_SYMBOL_GPL(tpm_continue_selftest);
617
618ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
619 char *buf)
620{
08837438 621 cap_t cap;
08e96e48
KJH		 622 ssize_t rc;
623
08837438
RA		 624 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
625 "attempting to determine the permanent enabled state");
626 if (rc)
08e96e48 627 return 0;
ec288bd3 628
08837438 629 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
ec288bd3 630 return rc;
08e96e48
KJH		 631}
632EXPORT_SYMBOL_GPL(tpm_show_enabled);
633
634ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
635 char *buf)
636{
08837438 637 cap_t cap;
08e96e48
KJH		 638 ssize_t rc;
639
08837438
RA		 640 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
641 "attempting to determine the permanent active state");
642 if (rc)
08e96e48 643 return 0;
ec288bd3 644
08837438 645 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
ec288bd3 646 return rc;
08e96e48
KJH		 647}
648EXPORT_SYMBOL_GPL(tpm_show_active);
649
650ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
651 char *buf)
652{
08837438 653 cap_t cap;
08e96e48
KJH		 654 ssize_t rc;
655
08837438
RA		 656 rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
657 "attempting to determine the owner state");
658 if (rc)
08e96e48 659 return 0;
ec288bd3 660
08837438 661 rc = sprintf(buf, "%d\n", cap.owned);
ec288bd3 662 return rc;
08e96e48
KJH		 663}
664EXPORT_SYMBOL_GPL(tpm_show_owned);
665
666ssize_t tpm_show_temp_deactivated(struct device * dev,
667 struct device_attribute * attr, char *buf)
668{
08837438 669 cap_t cap;
08e96e48
KJH		 670 ssize_t rc;
671
08837438
RA		 672 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
673 "attempting to determine the temporary state");
674 if (rc)
08e96e48 675 return 0;
ec288bd3 676
08837438 677 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
ec288bd3 678 return rc;
08e96e48
KJH		 679}
680EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
681
659aaf2b
RA		 682/*
683 * tpm_chip_find_get - return tpm_chip for given chip number
684 */
685static struct tpm_chip *tpm_chip_find_get(int chip_num)
686{
8920d5ad 687 struct tpm_chip *pos, *chip = NULL;
659aaf2b
RA		 688
689 rcu_read_lock();
690 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
691 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
692 continue;
693
8920d5ad
RA		 694 if (try_module_get(pos->dev->driver->owner)) {
695 chip = pos;
659aaf2b 696 break;
8920d5ad 697 }
659aaf2b
RA		 698 }
699 rcu_read_unlock();
8920d5ad 700 return chip;
659aaf2b
RA		 701}
702
703#define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
704#define READ_PCR_RESULT_SIZE 30
705static struct tpm_input_header pcrread_header = {
706 .tag = TPM_TAG_RQU_COMMAND,
707 .length = cpu_to_be32(14),
708 .ordinal = TPM_ORDINAL_PCRREAD
1da177e4
LT		 709};
710
659aaf2b
RA		 711int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
712{
713 int rc;
714 struct tpm_cmd_t cmd;
715
716 cmd.header.in = pcrread_header;
717 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
23acb98d 718 rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
659aaf2b
RA		 719 "attempting to read a pcr value");
720
721 if (rc == 0)
722 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
723 TPM_DIGEST_SIZE);
724 return rc;
725}
726
727/**
728 * tpm_pcr_read - read a pcr value
729 * @chip_num: tpm idx # or ANY
730 * @pcr_idx: pcr idx to retrieve
731 * @res_buf: TPM_PCR value
732 * size of res_buf is 20 bytes (or NULL if you don't care)
733 *
734 * The TPM driver should be built-in, but for whatever reason it
735 * isn't, protect against the chip disappearing, by incrementing
736 * the module usage count.
737 */
738int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
739{
740 struct tpm_chip *chip;
741 int rc;
742
743 chip = tpm_chip_find_get(chip_num);
744 if (chip == NULL)
745 return -ENODEV;
746 rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
a0e39349 747 tpm_chip_put(chip);
659aaf2b
RA		 748 return rc;
749}
750EXPORT_SYMBOL_GPL(tpm_pcr_read);
751
752/**
753 * tpm_pcr_extend - extend pcr value with hash
754 * @chip_num: tpm idx # or AN&
755 * @pcr_idx: pcr idx to extend
756 * @hash: hash value used to extend pcr value
757 *
758 * The TPM driver should be built-in, but for whatever reason it
759 * isn't, protect against the chip disappearing, by incrementing
760 * the module usage count.
761 */
762#define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
0afd9056 763#define EXTEND_PCR_RESULT_SIZE 34
659aaf2b
RA		 764static struct tpm_input_header pcrextend_header = {
765 .tag = TPM_TAG_RQU_COMMAND,
766 .length = cpu_to_be32(34),
767 .ordinal = TPM_ORD_PCR_EXTEND
768};
769
770int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
771{
772 struct tpm_cmd_t cmd;
773 int rc;
774 struct tpm_chip *chip;
775
776 chip = tpm_chip_find_get(chip_num);
777 if (chip == NULL)
778 return -ENODEV;
779
780 cmd.header.in = pcrextend_header;
659aaf2b
RA		 781 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
782 memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
0afd9056 783 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
659aaf2b
RA		 784 "attempting extend a PCR value");
785
a0e39349 786 tpm_chip_put(chip);
659aaf2b
RA		 787 return rc;
788}
789EXPORT_SYMBOL_GPL(tpm_pcr_extend);
790
c749ba91
MZ		 791int tpm_send(u32 chip_num, void *cmd, size_t buflen)
792{
793 struct tpm_chip *chip;
794 int rc;
795
796 chip = tpm_chip_find_get(chip_num);
797 if (chip == NULL)
798 return -ENODEV;
799
800 rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
801
802 tpm_chip_put(chip);
803 return rc;
804}
805EXPORT_SYMBOL_GPL(tpm_send);
806
6659ca2a
KH		 807ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
808 char *buf)
1da177e4 809{
08837438 810 cap_t cap;
659aaf2b 811 u8 digest[TPM_DIGEST_SIZE];
beed53a1 812 ssize_t rc;
81179bb6 813 int i, j, num_pcrs;
1da177e4 814 char *str = buf;
e659a3fe 815 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 816
08837438 817 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
beed53a1 818 "attempting to determine the number of PCRS");
08837438 819 if (rc)
e234bc97 820 return 0;
1da177e4 821
08837438 822 num_pcrs = be32_to_cpu(cap.num_pcrs);
1da177e4 823 for (i = 0; i < num_pcrs; i++) {
659aaf2b 824 rc = __tpm_pcr_read(chip, i, digest);
beed53a1 825 if (rc)
08837438 826 break;
1da177e4
LT		 827 str += sprintf(str, "PCR-%02d: ", i);
828 for (j = 0; j < TPM_DIGEST_SIZE; j++)
659aaf2b 829 str += sprintf(str, "%02X ", digest[j]);
1da177e4
LT		 830 str += sprintf(str, "\n");
831 }
832 return str - buf;
833}
6659ca2a 834EXPORT_SYMBOL_GPL(tpm_show_pcrs);
1da177e4
LT		 835
836#define READ_PUBEK_RESULT_SIZE 314
08837438
RA		 837#define TPM_ORD_READPUBEK cpu_to_be32(124)
838struct tpm_input_header tpm_readpubek_header = {
839 .tag = TPM_TAG_RQU_COMMAND,
840 .length = cpu_to_be32(30),
841 .ordinal = TPM_ORD_READPUBEK
1da177e4
LT		 842};
843
6659ca2a
KH		 844ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
845 char *buf)
1da177e4 846{
2df7111f 847 u8 *data;
08837438 848 struct tpm_cmd_t tpm_cmd;
beed53a1 849 ssize_t err;
81179bb6 850 int i, rc;
1da177e4
LT		 851 char *str = buf;
852
e659a3fe 853 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 854
08837438
RA		 855 tpm_cmd.header.in = tpm_readpubek_header;
856 err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
beed53a1
KJH		 857 "attempting to read the PUBEK");
858 if (err)
34d6e075 859 goto out;
1da177e4
LT		 860
861 /*
862 ignore header 10 bytes
863 algorithm 32 bits (1 == RSA )
864 encscheme 16 bits
865 sigscheme 16 bits
866 parameters (RSA 12->bytes: keybit, #primes, expbit)
867 keylenbytes 32 bits
868 256 byte modulus
869 ignore checksum 20 bytes
870 */
08837438 871 data = tpm_cmd.params.readpubek_out_buffer;
1da177e4
LT		 872 str +=
873 sprintf(str,
874 "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
875 "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
876 " %02X %02X %02X %02X %02X %02X %02X %02X\n"
877 "Modulus length: %d\nModulus: \n",
878 data[10], data[11], data[12], data[13], data[14],
879 data[15], data[16], data[17], data[22], data[23],
880 data[24], data[25], data[26], data[27], data[28],
881 data[29], data[30], data[31], data[32], data[33],
1dda8abe 882 be32_to_cpu(*((__be32 *) (data + 34))));
1da177e4
LT		 883
884 for (i = 0; i < 256; i++) {
1dda8abe 885 str += sprintf(str, "%02X ", data[i + 38]);
1da177e4
LT		 886 if ((i + 1) % 16 == 0)
887 str += sprintf(str, "\n");
888 }
34d6e075 889out:
beed53a1 890 rc = str - buf;
2df7111f 891 return rc;
1da177e4 892}
6659ca2a 893EXPORT_SYMBOL_GPL(tpm_show_pubek);
1da177e4 894
1da177e4 895
6659ca2a
KH		 896ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
897 char *buf)
1da177e4 898{
08837438 899 cap_t cap;
beed53a1 900 ssize_t rc;
1da177e4
LT		 901 char *str = buf;
902
08837438 903 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
beed53a1 904 "attempting to determine the manufacturer");
08837438 905 if (rc)
beed53a1 906 return 0;
1da177e4 907 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438 908 be32_to_cpu(cap.manufacturer_id));
1da177e4 909
08837438
RA		 910 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
911 "attempting to determine the 1.1 version");
beed53a1 912 if (rc)
08837438 913 return 0;
beed53a1
KJH		 914 str += sprintf(str,
915 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 916 cap.tpm_version.Major, cap.tpm_version.Minor,
917 cap.tpm_version.revMajor, cap.tpm_version.revMinor);
1da177e4
LT		 918 return str - buf;
919}
6659ca2a
KH		 920EXPORT_SYMBOL_GPL(tpm_show_caps);
921
08e96e48
KJH		 922ssize_t tpm_show_caps_1_2(struct device * dev,
923 struct device_attribute * attr, char *buf)
924{
08837438
RA		 925 cap_t cap;
926 ssize_t rc;
08e96e48
KJH		 927 char *str = buf;
928
08837438
RA		 929 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
930 "attempting to determine the manufacturer");
931 if (rc)
08e96e48 932 return 0;
08e96e48 933 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438
RA		 934 be32_to_cpu(cap.manufacturer_id));
935 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
936 "attempting to determine the 1.2 version");
937 if (rc)
938 return 0;
08e96e48
KJH		 939 str += sprintf(str,
940 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 941 cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
942 cap.tpm_version_1_2.revMajor,
943 cap.tpm_version_1_2.revMinor);
08e96e48
KJH		 944 return str - buf;
945}
946EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
947
04ab2293
SB		 948ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
949 char *buf)
950{
951 struct tpm_chip *chip = dev_get_drvdata(dev);
952
953 return sprintf(buf, "%d %d %d [%s]\n",
954 jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
955 jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
956 jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
957 chip->vendor.duration_adjusted
958 ? "adjusted" : "original");
959}
960EXPORT_SYMBOL_GPL(tpm_show_durations);
961
6659ca2a
KH		 962ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
963 const char *buf, size_t count)
964{
965 struct tpm_chip *chip = dev_get_drvdata(dev);
966 if (chip == NULL)
967 return 0;
968
90dda520 969 chip->vendor.cancel(chip);
6659ca2a
KH		 970 return count;
971}
972EXPORT_SYMBOL_GPL(tpm_store_cancel);
1da177e4 973
1da177e4
LT		 974/*
975 * Device file system interface to the TPM
f89c5edb
RA		 976 *
977 * It's assured that the chip will be opened just once,
978 * by the check of is_open variable, which is protected
979 * by driver_lock.
1da177e4
LT		 980 */
981int tpm_open(struct inode *inode, struct file *file)
982{
f02a9364 983 int minor = iminor(inode);
1da177e4
LT		 984 struct tpm_chip *chip = NULL, *pos;
985
f02a9364
RA		 986 rcu_read_lock();
987 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
90dda520 988 if (pos->vendor.miscdev.minor == minor) {
1da177e4 989 chip = pos;
f02a9364 990 get_device(chip->dev);
1da177e4
LT		 991 break;
992 }
993 }
f02a9364 994 rcu_read_unlock();
1da177e4 995
f02a9364
RA		 996 if (!chip)
997 return -ENODEV;
1da177e4 998
dc36d32c 999 if (test_and_set_bit(0, &chip->is_open)) {
b888c87b 1000 dev_dbg(chip->dev, "Another process owns this TPM\n");
f02a9364
RA		 1001 put_device(chip->dev);
1002 return -EBUSY;
1da177e4
LT		 1003 }
1004
1309d7af 1005 chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
1da177e4 1006 if (chip->data_buffer == NULL) {
dc36d32c 1007 clear_bit(0, &chip->is_open);
e659a3fe 1008 put_device(chip->dev);
1da177e4
LT		 1009 return -ENOMEM;
1010 }
1011
1012 atomic_set(&chip->data_pending, 0);
1013
1014 file->private_data = chip;
1015 return 0;
1da177e4 1016}
1da177e4
LT		 1017EXPORT_SYMBOL_GPL(tpm_open);
1018
f02a9364
RA		 1019/*
1020 * Called on file close
1021 */
1da177e4
LT		 1022int tpm_release(struct inode *inode, struct file *file)
1023{
1024 struct tpm_chip *chip = file->private_data;
1da177e4 1025
4bdec11f 1026 del_singleshot_timer_sync(&chip->user_read_timer);
2e5c44c9 1027 flush_work_sync(&chip->work);
5e976d55 1028 file->private_data = NULL;
1da177e4 1029 atomic_set(&chip->data_pending, 0);
f02a9364 1030 kfree(chip->data_buffer);
dc36d32c 1031 clear_bit(0, &chip->is_open);
e659a3fe 1032 put_device(chip->dev);
1da177e4
LT		 1033 return 0;
1034}
1da177e4
LT		 1035EXPORT_SYMBOL_GPL(tpm_release);
1036
b888c87b 1037ssize_t tpm_write(struct file *file, const char __user *buf,
3c2f606a 1038 size_t size, loff_t *off)
1da177e4
LT		 1039{
1040 struct tpm_chip *chip = file->private_data;
01476001 1041 size_t in_size = size, out_size;
1da177e4
LT		 1042
1043 /* cannot perform a write until the read has cleared
1044 either via tpm_read or a user_read_timer timeout */
700d8bdc
NA		 1045 while (atomic_read(&chip->data_pending) != 0)
1046 msleep(TPM_TIMEOUT);
1da177e4 1047
d081d470 1048 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 1049
1050 if (in_size > TPM_BUFSIZE)
1051 in_size = TPM_BUFSIZE;
1052
1053 if (copy_from_user
1054 (chip->data_buffer, (void __user *) buf, in_size)) {
d081d470 1055 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1056 return -EFAULT;
1057 }
1058
1059 /* atomic tpm command send and result receive */
1060 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1061
1062 atomic_set(&chip->data_pending, out_size);
d081d470 1063 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1064
1065 /* Set a timeout by which the reader must come claim the result */
fe3fd483 1066 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1da177e4
LT		 1067
1068 return in_size;
1069}
1da177e4
LT		 1070EXPORT_SYMBOL_GPL(tpm_write);
1071
3c2f606a
KJH		 1072ssize_t tpm_read(struct file *file, char __user *buf,
1073 size_t size, loff_t *off)
1da177e4
LT		 1074{
1075 struct tpm_chip *chip = file->private_data;
01476001 1076 ssize_t ret_size;
1da177e4 1077
5b44bd58 1078 del_singleshot_timer_sync(&chip->user_read_timer);
2e5c44c9 1079 flush_work_sync(&chip->work);
5b44bd58
KH		 1080 ret_size = atomic_read(&chip->data_pending);
1081 atomic_set(&chip->data_pending, 0);
1082 if (ret_size > 0) { /* relay data */
1083 if (size < ret_size)
1084 ret_size = size;
1da177e4 1085
d081d470 1086 mutex_lock(&chip->buffer_mutex);
f6a2382c 1087 if (copy_to_user(buf, chip->data_buffer, ret_size))
5b44bd58 1088 ret_size = -EFAULT;
d081d470 1089 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1090 }
1091
1092 return ret_size;
1093}
1da177e4
LT		 1094EXPORT_SYMBOL_GPL(tpm_read);
1095
e659a3fe 1096void tpm_remove_hardware(struct device *dev)
1da177e4 1097{
e659a3fe 1098 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1099
1100 if (chip == NULL) {
e659a3fe 1101 dev_err(dev, "No device data found\n");
1da177e4
LT		 1102 return;
1103 }
1104
1105 spin_lock(&driver_lock);
f02a9364 1106 list_del_rcu(&chip->list);
1da177e4 1107 spin_unlock(&driver_lock);
f02a9364 1108 synchronize_rcu();
1da177e4 1109
90dda520 1110 misc_deregister(&chip->vendor.miscdev);
90dda520 1111 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
55a82ab3 1112 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1113
5bd91f18
RM		 1114 /* write it this way to be explicit (chip->dev == dev) */
1115 put_device(chip->dev);
1da177e4 1116}
e659a3fe 1117EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4 1118
225a9be2
RA		 1119#define TPM_ORD_SAVESTATE cpu_to_be32(152)
1120#define SAVESTATE_RESULT_SIZE 10
1121
1122static struct tpm_input_header savestate_header = {
1123 .tag = TPM_TAG_RQU_COMMAND,
1124 .length = cpu_to_be32(10),
1125 .ordinal = TPM_ORD_SAVESTATE
1126};
1127
1da177e4
LT		 1128/*
1129 * We are about to suspend. Save the TPM state
1130 * so that it can be restored.
1131 */
ce2c87d4 1132int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1da177e4 1133{
ce2c87d4 1134 struct tpm_chip *chip = dev_get_drvdata(dev);
225a9be2
RA		 1135 struct tpm_cmd_t cmd;
1136 int rc;
1137
1138 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
2490c681 1139
1da177e4
LT		 1140 if (chip == NULL)
1141 return -ENODEV;
1142
225a9be2
RA		 1143 /* for buggy tpm, flush pcrs with extend to selected dummy */
1144 if (tpm_suspend_pcr) {
1145 cmd.header.in = pcrextend_header;
1146 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1147 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1148 TPM_DIGEST_SIZE);
1149 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1150 "extending dummy pcr before suspend");
1151 }
1152
1153 /* now do the actual savestate */
1154 cmd.header.in = savestate_header;
1155 rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
1156 "sending savestate before suspend");
1157 return rc;
1da177e4 1158}
1da177e4
LT		 1159EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1160
1161/*
1162 * Resume from a power safe. The BIOS already restored
1163 * the TPM state.
1164 */
ce2c87d4 1165int tpm_pm_resume(struct device *dev)
1da177e4 1166{
ce2c87d4 1167 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1168
1169 if (chip == NULL)
1170 return -ENODEV;
1171
1da177e4
LT		 1172 return 0;
1173}
1da177e4
LT		 1174EXPORT_SYMBOL_GPL(tpm_pm_resume);
1175
253115b7
RA		 1176/* In case vendor provided release function, call it too.*/
1177
1178void tpm_dev_vendor_release(struct tpm_chip *chip)
1179{
1180 if (chip->vendor.release)
1181 chip->vendor.release(chip->dev);
1182
1183 clear_bit(chip->dev_num, dev_mask);
1184 kfree(chip->vendor.miscdev.name);
1185}
1186EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1187
1188
5bd91f18
RM		 1189/*
1190 * Once all references to platform device are down to 0,
1191 * release all allocated structures.
5bd91f18 1192 */
cbb2ed4a 1193void tpm_dev_release(struct device *dev)
5bd91f18
RM		 1194{
1195 struct tpm_chip *chip = dev_get_drvdata(dev);
1196
253115b7 1197 tpm_dev_vendor_release(chip);
5bd91f18 1198
253115b7 1199 chip->release(dev);
5bd91f18
RM		 1200 kfree(chip);
1201}
253115b7 1202EXPORT_SYMBOL_GPL(tpm_dev_release);
5bd91f18 1203
1da177e4
LT		 1204/*
1205 * Called from tpm_<specific>.c probe function only for devices
1206 * the driver has determined it should claim. Prior to calling
1207 * this function the specific probe function has called pci_enable_device
1208 * upon errant exit from this function specific probe function should call
1209 * pci_disable_device
1210 */
f02a9364
RA		 1211struct tpm_chip *tpm_register_hardware(struct device *dev,
1212 const struct tpm_vendor_specific *entry)
1da177e4 1213{
6f9beccb
KJH		 1214#define DEVNAME_SIZE 7
1215
1216 char *devname;
1da177e4 1217 struct tpm_chip *chip;
1da177e4
LT		 1218
1219 /* Driver specific per-device data */
b888c87b 1220 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
8e39c933
PW		 1221 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1222
dd78c943
AM		 1223 if (chip == NULL || devname == NULL)
1224 goto out_free;
1da177e4 1225
d081d470
MK		 1226 mutex_init(&chip->buffer_mutex);
1227 mutex_init(&chip->tpm_mutex);
1da177e4
LT		 1228 INIT_LIST_HEAD(&chip->list);
1229
c4028958 1230 INIT_WORK(&chip->work, timeout_work);
09e12f9f 1231
40565f19
JS		 1232 setup_timer(&chip->user_read_timer, user_reader_timeout,
1233 (unsigned long)chip);
fe3fd483 1234
90dda520 1235 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4 1236
10685a95 1237 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1da177e4 1238
10685a95 1239 if (chip->dev_num >= TPM_NUM_DEVICES) {
b888c87b 1240 dev_err(dev, "No available tpm device numbers\n");
dd78c943 1241 goto out_free;
1da177e4 1242 } else if (chip->dev_num == 0)
90dda520 1243 chip->vendor.miscdev.minor = TPM_MINOR;
1da177e4 1244 else
90dda520 1245 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1da177e4 1246
10685a95
KJH		 1247 set_bit(chip->dev_num, dev_mask);
1248
6f9beccb 1249 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
90dda520 1250 chip->vendor.miscdev.name = devname;
1da177e4 1251
94fbcded 1252 chip->vendor.miscdev.parent = dev;
e659a3fe 1253 chip->dev = get_device(dev);
5bd91f18
RM		 1254 chip->release = dev->release;
1255 dev->release = tpm_dev_release;
1256 dev_set_drvdata(dev, chip);
1da177e4 1257
90dda520 1258 if (misc_register(&chip->vendor.miscdev)) {
e659a3fe 1259 dev_err(chip->dev,
1da177e4 1260 "unable to misc_register %s, minor %d\n",
90dda520
KJH		 1261 chip->vendor.miscdev.name,
1262 chip->vendor.miscdev.minor);
5bd91f18 1263 put_device(chip->dev);
e0dd03ca 1264 return NULL;
1da177e4
LT		 1265 }
1266
f33d9bd5 1267 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
5d469ec0 1268 misc_deregister(&chip->vendor.miscdev);
5bd91f18 1269 put_device(chip->dev);
f02a9364 1270
f33d9bd5
JG		 1271 return NULL;
1272 }
1da177e4 1273
55a82ab3
KJH		 1274 chip->bios_dir = tpm_bios_log_setup(devname);
1275
f02a9364
RA		 1276 /* Make chip available */
1277 spin_lock(&driver_lock);
1278 list_add_rcu(&chip->list, &tpm_chip_list);
1279 spin_unlock(&driver_lock);
1280
e0dd03ca 1281 return chip;
dd78c943
AM		 1282
1283out_free:
1284 kfree(chip);
1285 kfree(devname);
1286 return NULL;
1da177e4 1287}
1da177e4
LT		 1288EXPORT_SYMBOL_GPL(tpm_register_hardware);
1289
1da177e4
LT		 1290MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1291MODULE_DESCRIPTION("TPM Driver");
1292MODULE_VERSION("2.0");
1293MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)