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TPM: Call tpm_transmit with correct size
[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
6b07d30a
PH		 386 if (bufsiz > TPM_BUFSIZE)
387 bufsiz = TPM_BUFSIZE;
388
81179bb6 389 count = be32_to_cpu(*((__be32 *) (buf + 2)));
9e18ee19 390 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
1da177e4
LT		 391 if (count == 0)
392 return -ENODATA;
393 if (count > bufsiz) {
e659a3fe 394 dev_err(chip->dev,
b76be681 395 "invalid count value %x %zx \n", count, bufsiz);
1da177e4
LT		 396 return -E2BIG;
397 }
398
d081d470 399 mutex_lock(&chip->tpm_mutex);
1da177e4 400
90dda520 401 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
e659a3fe 402 dev_err(chip->dev,
d9e5b6bf
KH		 403 "tpm_transmit: tpm_send: error %zd\n", rc);
404 goto out;
1da177e4
LT		 405 }
406
27084efe
LD		 407 if (chip->vendor.irq)
408 goto out_recv;
409
9e18ee19 410 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
1da177e4 411 do {
90dda520
KJH		 412 u8 status = chip->vendor.status(chip);
413 if ((status & chip->vendor.req_complete_mask) ==
414 chip->vendor.req_complete_val)
1da177e4 415 goto out_recv;
d9e5b6bf 416
90dda520 417 if ((status == chip->vendor.req_canceled)) {
e659a3fe 418 dev_err(chip->dev, "Operation Canceled\n");
d9e5b6bf
KH		 419 rc = -ECANCELED;
420 goto out;
421 }
422
423 msleep(TPM_TIMEOUT); /* CHECK */
1da177e4 424 rmb();
700d8bdc 425 } while (time_before(jiffies, stop));
1da177e4 426
90dda520 427 chip->vendor.cancel(chip);
e659a3fe 428 dev_err(chip->dev, "Operation Timed out\n");
d9e5b6bf
KH		 429 rc = -ETIME;
430 goto out;
1da177e4
LT		 431
432out_recv:
90dda520 433 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
d9e5b6bf 434 if (rc < 0)
e659a3fe 435 dev_err(chip->dev,
d9e5b6bf
KH		 436 "tpm_transmit: tpm_recv: error %zd\n", rc);
437out:
d081d470 438 mutex_unlock(&chip->tpm_mutex);
d9e5b6bf 439 return rc;
1da177e4
LT		 440}
441
442#define TPM_DIGEST_SIZE 20
beed53a1
KJH		 443#define TPM_ERROR_SIZE 10
444#define TPM_RET_CODE_IDX 6
beed53a1
KJH		 445
446enum tpm_capabilities {
08837438
RA		 447 TPM_CAP_FLAG = cpu_to_be32(4),
448 TPM_CAP_PROP = cpu_to_be32(5),
449 CAP_VERSION_1_1 = cpu_to_be32(0x06),
450 CAP_VERSION_1_2 = cpu_to_be32(0x1A)
beed53a1
KJH		 451};
452
453enum tpm_sub_capabilities {
08837438
RA		 454 TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
455 TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
456 TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
457 TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
458 TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
459 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
460 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
beed53a1 461
1da177e4
LT		 462};
463
08837438
RA		 464static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
465 int len, const char *desc)
beed53a1
KJH		 466{
467 int err;
468
08837438 469 len = tpm_transmit(chip,(u8 *) cmd, len);
beed53a1
KJH		 470 if (len < 0)
471 return len;
472 if (len == TPM_ERROR_SIZE) {
08837438 473 err = be32_to_cpu(cmd->header.out.return_code);
beed53a1
KJH		 474 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
475 return err;
476 }
477 return 0;
478}
479
08837438
RA		 480#define TPM_INTERNAL_RESULT_SIZE 200
481#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
482#define TPM_ORD_GET_CAP cpu_to_be32(101)
483
484static const struct tpm_input_header tpm_getcap_header = {
485 .tag = TPM_TAG_RQU_COMMAND,
486 .length = cpu_to_be32(22),
487 .ordinal = TPM_ORD_GET_CAP
488};
489
490ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
491 const char *desc)
492{
493 struct tpm_cmd_t tpm_cmd;
494 int rc;
495 struct tpm_chip *chip = dev_get_drvdata(dev);
496
497 tpm_cmd.header.in = tpm_getcap_header;
498 if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
499 tpm_cmd.params.getcap_in.cap = subcap_id;
500 /*subcap field not necessary */
501 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
502 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
503 } else {
504 if (subcap_id == TPM_CAP_FLAG_PERM ||
505 subcap_id == TPM_CAP_FLAG_VOL)
506 tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
507 else
508 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
509 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
510 tpm_cmd.params.getcap_in.subcap = subcap_id;
511 }
512 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
513 if (!rc)
514 *cap = tpm_cmd.params.getcap_out.cap;
515 return rc;
516}
517
08e96e48
KJH		 518void tpm_gen_interrupt(struct tpm_chip *chip)
519{
08837438 520 struct tpm_cmd_t tpm_cmd;
08e96e48
KJH		 521 ssize_t rc;
522
08837438
RA		 523 tpm_cmd.header.in = tpm_getcap_header;
524 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
525 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
526 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 527
08837438 528 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 529 "attempting to determine the timeouts");
530}
531EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
532
533void tpm_get_timeouts(struct tpm_chip *chip)
534{
08837438
RA		 535 struct tpm_cmd_t tpm_cmd;
536 struct timeout_t *timeout_cap;
537 struct duration_t *duration_cap;
08e96e48
KJH		 538 ssize_t rc;
539 u32 timeout;
e3e1a1e1 540 unsigned int scale = 1;
08e96e48 541
08837438
RA		 542 tpm_cmd.header.in = tpm_getcap_header;
543 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
544 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
545 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 546
08837438 547 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 548 "attempting to determine the timeouts");
549 if (rc)
550 goto duration;
551
829bf067
SB		 552 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
553 be32_to_cpu(tpm_cmd.header.out.length)
554 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
555 return;
08e96e48 556
08837438 557 timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
08e96e48 558 /* Don't overwrite default if value is 0 */
08837438 559 timeout = be32_to_cpu(timeout_cap->a);
e3e1a1e1
SB		 560 if (timeout && timeout < 1000) {
561 /* timeouts in msec rather usec */
562 scale = 1000;
62592101 563 chip->vendor.timeout_adjusted = true;
e3e1a1e1 564 }
08e96e48 565 if (timeout)
e3e1a1e1 566 chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
08837438 567 timeout = be32_to_cpu(timeout_cap->b);
08e96e48 568 if (timeout)
e3e1a1e1 569 chip->vendor.timeout_b = usecs_to_jiffies(timeout * scale);
08837438 570 timeout = be32_to_cpu(timeout_cap->c);
08e96e48 571 if (timeout)
e3e1a1e1 572 chip->vendor.timeout_c = usecs_to_jiffies(timeout * scale);
08837438 573 timeout = be32_to_cpu(timeout_cap->d);
08e96e48 574 if (timeout)
e3e1a1e1 575 chip->vendor.timeout_d = usecs_to_jiffies(timeout * scale);
08e96e48
KJH		 576
577duration:
08837438
RA		 578 tpm_cmd.header.in = tpm_getcap_header;
579 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
580 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
581 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
08e96e48 582
08837438 583 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 584 "attempting to determine the durations");
585 if (rc)
586 return;
587
979b1406
SB		 588 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
589 be32_to_cpu(tpm_cmd.header.out.length)
590 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
08e96e48 591 return;
979b1406 592
08837438 593 duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
08e96e48 594 chip->vendor.duration[TPM_SHORT] =
08837438 595 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
e934acca
SB		 596 chip->vendor.duration[TPM_MEDIUM] =
597 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
598 chip->vendor.duration[TPM_LONG] =
599 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
600
292cf4a8
VK		 601 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
602 * value wrong and apparently reports msecs rather than usecs. So we
603 * fix up the resulting too-small TPM_SHORT value to make things work.
e934acca 604 * We also scale the TPM_MEDIUM and -_LONG values by 1000.
292cf4a8 605 */
e934acca 606 if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
292cf4a8 607 chip->vendor.duration[TPM_SHORT] = HZ;
e934acca
SB		 608 chip->vendor.duration[TPM_MEDIUM] *= 1000;
609 chip->vendor.duration[TPM_LONG] *= 1000;
04ab2293 610 chip->vendor.duration_adjusted = true;
e934acca
SB		 611 dev_info(chip->dev, "Adjusting TPM timeout parameters.");
612 }
08e96e48
KJH		 613}
614EXPORT_SYMBOL_GPL(tpm_get_timeouts);
615
616void tpm_continue_selftest(struct tpm_chip *chip)
617{
618 u8 data[] = {
619 0, 193, /* TPM_TAG_RQU_COMMAND */
620 0, 0, 0, 10, /* length */
c9206693 621 0, 0, 0, 83, /* TPM_ORD_ContinueSelfTest */
08e96e48
KJH		 622 };
623
624 tpm_transmit(chip, data, sizeof(data));
625}
626EXPORT_SYMBOL_GPL(tpm_continue_selftest);
627
628ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
629 char *buf)
630{
08837438 631 cap_t cap;
08e96e48
KJH		 632 ssize_t rc;
633
08837438
RA		 634 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
635 "attempting to determine the permanent enabled state");
636 if (rc)
08e96e48 637 return 0;
ec288bd3 638
08837438 639 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
ec288bd3 640 return rc;
08e96e48
KJH		 641}
642EXPORT_SYMBOL_GPL(tpm_show_enabled);
643
644ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
645 char *buf)
646{
08837438 647 cap_t cap;
08e96e48
KJH		 648 ssize_t rc;
649
08837438
RA		 650 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
651 "attempting to determine the permanent active state");
652 if (rc)
08e96e48 653 return 0;
ec288bd3 654
08837438 655 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
ec288bd3 656 return rc;
08e96e48
KJH		 657}
658EXPORT_SYMBOL_GPL(tpm_show_active);
659
660ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
661 char *buf)
662{
08837438 663 cap_t cap;
08e96e48
KJH		 664 ssize_t rc;
665
08837438
RA		 666 rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
667 "attempting to determine the owner state");
668 if (rc)
08e96e48 669 return 0;
ec288bd3 670
08837438 671 rc = sprintf(buf, "%d\n", cap.owned);
ec288bd3 672 return rc;
08e96e48
KJH		 673}
674EXPORT_SYMBOL_GPL(tpm_show_owned);
675
676ssize_t tpm_show_temp_deactivated(struct device * dev,
677 struct device_attribute * attr, char *buf)
678{
08837438 679 cap_t cap;
08e96e48
KJH		 680 ssize_t rc;
681
08837438
RA		 682 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
683 "attempting to determine the temporary state");
684 if (rc)
08e96e48 685 return 0;
ec288bd3 686
08837438 687 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
ec288bd3 688 return rc;
08e96e48
KJH		 689}
690EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
691
659aaf2b
RA		 692/*
693 * tpm_chip_find_get - return tpm_chip for given chip number
694 */
695static struct tpm_chip *tpm_chip_find_get(int chip_num)
696{
8920d5ad 697 struct tpm_chip *pos, *chip = NULL;
659aaf2b
RA		 698
699 rcu_read_lock();
700 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
701 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
702 continue;
703
8920d5ad
RA		 704 if (try_module_get(pos->dev->driver->owner)) {
705 chip = pos;
659aaf2b 706 break;
8920d5ad 707 }
659aaf2b
RA		 708 }
709 rcu_read_unlock();
8920d5ad 710 return chip;
659aaf2b
RA		 711}
712
713#define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
714#define READ_PCR_RESULT_SIZE 30
715static struct tpm_input_header pcrread_header = {
716 .tag = TPM_TAG_RQU_COMMAND,
717 .length = cpu_to_be32(14),
718 .ordinal = TPM_ORDINAL_PCRREAD
1da177e4
LT		 719};
720
659aaf2b
RA		 721int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
722{
723 int rc;
724 struct tpm_cmd_t cmd;
725
726 cmd.header.in = pcrread_header;
727 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
23acb98d 728 rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
659aaf2b
RA		 729 "attempting to read a pcr value");
730
731 if (rc == 0)
732 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
733 TPM_DIGEST_SIZE);
734 return rc;
735}
736
737/**
738 * tpm_pcr_read - read a pcr value
739 * @chip_num: tpm idx # or ANY
740 * @pcr_idx: pcr idx to retrieve
741 * @res_buf: TPM_PCR value
742 * size of res_buf is 20 bytes (or NULL if you don't care)
743 *
744 * The TPM driver should be built-in, but for whatever reason it
745 * isn't, protect against the chip disappearing, by incrementing
746 * the module usage count.
747 */
748int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
749{
750 struct tpm_chip *chip;
751 int rc;
752
753 chip = tpm_chip_find_get(chip_num);
754 if (chip == NULL)
755 return -ENODEV;
756 rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
a0e39349 757 tpm_chip_put(chip);
659aaf2b
RA		 758 return rc;
759}
760EXPORT_SYMBOL_GPL(tpm_pcr_read);
761
762/**
763 * tpm_pcr_extend - extend pcr value with hash
764 * @chip_num: tpm idx # or AN&
765 * @pcr_idx: pcr idx to extend
766 * @hash: hash value used to extend pcr value
767 *
768 * The TPM driver should be built-in, but for whatever reason it
769 * isn't, protect against the chip disappearing, by incrementing
770 * the module usage count.
771 */
772#define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
0afd9056 773#define EXTEND_PCR_RESULT_SIZE 34
659aaf2b
RA		 774static struct tpm_input_header pcrextend_header = {
775 .tag = TPM_TAG_RQU_COMMAND,
776 .length = cpu_to_be32(34),
777 .ordinal = TPM_ORD_PCR_EXTEND
778};
779
780int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
781{
782 struct tpm_cmd_t cmd;
783 int rc;
784 struct tpm_chip *chip;
785
786 chip = tpm_chip_find_get(chip_num);
787 if (chip == NULL)
788 return -ENODEV;
789
790 cmd.header.in = pcrextend_header;
659aaf2b
RA		 791 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
792 memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
0afd9056 793 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
659aaf2b
RA		 794 "attempting extend a PCR value");
795
a0e39349 796 tpm_chip_put(chip);
659aaf2b
RA		 797 return rc;
798}
799EXPORT_SYMBOL_GPL(tpm_pcr_extend);
800
c749ba91
MZ		 801int tpm_send(u32 chip_num, void *cmd, size_t buflen)
802{
803 struct tpm_chip *chip;
804 int rc;
805
806 chip = tpm_chip_find_get(chip_num);
807 if (chip == NULL)
808 return -ENODEV;
809
810 rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
811
812 tpm_chip_put(chip);
813 return rc;
814}
815EXPORT_SYMBOL_GPL(tpm_send);
816
6659ca2a
KH		 817ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
818 char *buf)
1da177e4 819{
08837438 820 cap_t cap;
659aaf2b 821 u8 digest[TPM_DIGEST_SIZE];
beed53a1 822 ssize_t rc;
81179bb6 823 int i, j, num_pcrs;
1da177e4 824 char *str = buf;
e659a3fe 825 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 826
08837438 827 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
beed53a1 828 "attempting to determine the number of PCRS");
08837438 829 if (rc)
e234bc97 830 return 0;
1da177e4 831
08837438 832 num_pcrs = be32_to_cpu(cap.num_pcrs);
1da177e4 833 for (i = 0; i < num_pcrs; i++) {
659aaf2b 834 rc = __tpm_pcr_read(chip, i, digest);
beed53a1 835 if (rc)
08837438 836 break;
1da177e4
LT		 837 str += sprintf(str, "PCR-%02d: ", i);
838 for (j = 0; j < TPM_DIGEST_SIZE; j++)
659aaf2b 839 str += sprintf(str, "%02X ", digest[j]);
1da177e4
LT		 840 str += sprintf(str, "\n");
841 }
842 return str - buf;
843}
6659ca2a 844EXPORT_SYMBOL_GPL(tpm_show_pcrs);
1da177e4
LT		 845
846#define READ_PUBEK_RESULT_SIZE 314
08837438
RA		 847#define TPM_ORD_READPUBEK cpu_to_be32(124)
848struct tpm_input_header tpm_readpubek_header = {
849 .tag = TPM_TAG_RQU_COMMAND,
850 .length = cpu_to_be32(30),
851 .ordinal = TPM_ORD_READPUBEK
1da177e4
LT		 852};
853
6659ca2a
KH		 854ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
855 char *buf)
1da177e4 856{
2df7111f 857 u8 *data;
08837438 858 struct tpm_cmd_t tpm_cmd;
beed53a1 859 ssize_t err;
81179bb6 860 int i, rc;
1da177e4
LT		 861 char *str = buf;
862
e659a3fe 863 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 864
08837438
RA		 865 tpm_cmd.header.in = tpm_readpubek_header;
866 err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
beed53a1
KJH		 867 "attempting to read the PUBEK");
868 if (err)
34d6e075 869 goto out;
1da177e4
LT		 870
871 /*
872 ignore header 10 bytes
873 algorithm 32 bits (1 == RSA )
874 encscheme 16 bits
875 sigscheme 16 bits
876 parameters (RSA 12->bytes: keybit, #primes, expbit)
877 keylenbytes 32 bits
878 256 byte modulus
879 ignore checksum 20 bytes
880 */
08837438 881 data = tpm_cmd.params.readpubek_out_buffer;
1da177e4
LT		 882 str +=
883 sprintf(str,
5a79444f
SB		 884 "Algorithm: %02X %02X %02X %02X\n"
885 "Encscheme: %02X %02X\n"
886 "Sigscheme: %02X %02X\n"
887 "Parameters: %02X %02X %02X %02X "
888 "%02X %02X %02X %02X "
889 "%02X %02X %02X %02X\n"
890 "Modulus length: %d\n"
891 "Modulus:\n",
892 data[0], data[1], data[2], data[3],
893 data[4], data[5],
894 data[6], data[7],
895 data[12], data[13], data[14], data[15],
896 data[16], data[17], data[18], data[19],
897 data[20], data[21], data[22], data[23],
898 be32_to_cpu(*((__be32 *) (data + 24))));
1da177e4
LT		 899
900 for (i = 0; i < 256; i++) {
5a79444f 901 str += sprintf(str, "%02X ", data[i + 28]);
1da177e4
LT		 902 if ((i + 1) % 16 == 0)
903 str += sprintf(str, "\n");
904 }
34d6e075 905out:
beed53a1 906 rc = str - buf;
2df7111f 907 return rc;
1da177e4 908}
6659ca2a 909EXPORT_SYMBOL_GPL(tpm_show_pubek);
1da177e4 910
1da177e4 911
6659ca2a
KH		 912ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
913 char *buf)
1da177e4 914{
08837438 915 cap_t cap;
beed53a1 916 ssize_t rc;
1da177e4
LT		 917 char *str = buf;
918
08837438 919 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
beed53a1 920 "attempting to determine the manufacturer");
08837438 921 if (rc)
beed53a1 922 return 0;
1da177e4 923 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438 924 be32_to_cpu(cap.manufacturer_id));
1da177e4 925
08837438
RA		 926 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
927 "attempting to determine the 1.1 version");
beed53a1 928 if (rc)
08837438 929 return 0;
beed53a1
KJH		 930 str += sprintf(str,
931 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 932 cap.tpm_version.Major, cap.tpm_version.Minor,
933 cap.tpm_version.revMajor, cap.tpm_version.revMinor);
1da177e4
LT		 934 return str - buf;
935}
6659ca2a
KH		 936EXPORT_SYMBOL_GPL(tpm_show_caps);
937
08e96e48
KJH		 938ssize_t tpm_show_caps_1_2(struct device * dev,
939 struct device_attribute * attr, char *buf)
940{
08837438
RA		 941 cap_t cap;
942 ssize_t rc;
08e96e48
KJH		 943 char *str = buf;
944
08837438
RA		 945 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
946 "attempting to determine the manufacturer");
947 if (rc)
08e96e48 948 return 0;
08e96e48 949 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438
RA		 950 be32_to_cpu(cap.manufacturer_id));
951 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
952 "attempting to determine the 1.2 version");
953 if (rc)
954 return 0;
08e96e48
KJH		 955 str += sprintf(str,
956 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 957 cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
958 cap.tpm_version_1_2.revMajor,
959 cap.tpm_version_1_2.revMinor);
08e96e48
KJH		 960 return str - buf;
961}
962EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
963
04ab2293
SB		 964ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
965 char *buf)
966{
967 struct tpm_chip *chip = dev_get_drvdata(dev);
968
969 return sprintf(buf, "%d %d %d [%s]\n",
970 jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
971 jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
972 jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
973 chip->vendor.duration_adjusted
974 ? "adjusted" : "original");
975}
976EXPORT_SYMBOL_GPL(tpm_show_durations);
977
62592101
SB		 978ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
979 char *buf)
980{
981 struct tpm_chip *chip = dev_get_drvdata(dev);
982
983 return sprintf(buf, "%d %d %d %d [%s]\n",
984 jiffies_to_usecs(chip->vendor.timeout_a),
985 jiffies_to_usecs(chip->vendor.timeout_b),
986 jiffies_to_usecs(chip->vendor.timeout_c),
987 jiffies_to_usecs(chip->vendor.timeout_d),
988 chip->vendor.timeout_adjusted
989 ? "adjusted" : "original");
990}
991EXPORT_SYMBOL_GPL(tpm_show_timeouts);
992
6659ca2a
KH		 993ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
994 const char *buf, size_t count)
995{
996 struct tpm_chip *chip = dev_get_drvdata(dev);
997 if (chip == NULL)
998 return 0;
999
90dda520 1000 chip->vendor.cancel(chip);
6659ca2a
KH		 1001 return count;
1002}
1003EXPORT_SYMBOL_GPL(tpm_store_cancel);
1da177e4 1004
1da177e4
LT		 1005/*
1006 * Device file system interface to the TPM
f89c5edb
RA		 1007 *
1008 * It's assured that the chip will be opened just once,
1009 * by the check of is_open variable, which is protected
1010 * by driver_lock.
1da177e4
LT		 1011 */
1012int tpm_open(struct inode *inode, struct file *file)
1013{
f02a9364 1014 int minor = iminor(inode);
1da177e4
LT		 1015 struct tpm_chip *chip = NULL, *pos;
1016
f02a9364
RA		 1017 rcu_read_lock();
1018 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
90dda520 1019 if (pos->vendor.miscdev.minor == minor) {
1da177e4 1020 chip = pos;
f02a9364 1021 get_device(chip->dev);
1da177e4
LT		 1022 break;
1023 }
1024 }
f02a9364 1025 rcu_read_unlock();
1da177e4 1026
f02a9364
RA		 1027 if (!chip)
1028 return -ENODEV;
1da177e4 1029
dc36d32c 1030 if (test_and_set_bit(0, &chip->is_open)) {
b888c87b 1031 dev_dbg(chip->dev, "Another process owns this TPM\n");
f02a9364
RA		 1032 put_device(chip->dev);
1033 return -EBUSY;
1da177e4
LT		 1034 }
1035
1309d7af 1036 chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
1da177e4 1037 if (chip->data_buffer == NULL) {
dc36d32c 1038 clear_bit(0, &chip->is_open);
e659a3fe 1039 put_device(chip->dev);
1da177e4
LT		 1040 return -ENOMEM;
1041 }
1042
1043 atomic_set(&chip->data_pending, 0);
1044
1045 file->private_data = chip;
1046 return 0;
1da177e4 1047}
1da177e4
LT		 1048EXPORT_SYMBOL_GPL(tpm_open);
1049
f02a9364
RA		 1050/*
1051 * Called on file close
1052 */
1da177e4
LT		 1053int tpm_release(struct inode *inode, struct file *file)
1054{
1055 struct tpm_chip *chip = file->private_data;
1da177e4 1056
4bdec11f 1057 del_singleshot_timer_sync(&chip->user_read_timer);
2e5c44c9 1058 flush_work_sync(&chip->work);
5e976d55 1059 file->private_data = NULL;
1da177e4 1060 atomic_set(&chip->data_pending, 0);
f02a9364 1061 kfree(chip->data_buffer);
dc36d32c 1062 clear_bit(0, &chip->is_open);
e659a3fe 1063 put_device(chip->dev);
1da177e4
LT		 1064 return 0;
1065}
1da177e4
LT		 1066EXPORT_SYMBOL_GPL(tpm_release);
1067
b888c87b 1068ssize_t tpm_write(struct file *file, const char __user *buf,
3c2f606a 1069 size_t size, loff_t *off)
1da177e4
LT		 1070{
1071 struct tpm_chip *chip = file->private_data;
01476001 1072 size_t in_size = size, out_size;
1da177e4
LT		 1073
1074 /* cannot perform a write until the read has cleared
1075 either via tpm_read or a user_read_timer timeout */
700d8bdc
NA		 1076 while (atomic_read(&chip->data_pending) != 0)
1077 msleep(TPM_TIMEOUT);
1da177e4 1078
d081d470 1079 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 1080
1081 if (in_size > TPM_BUFSIZE)
1082 in_size = TPM_BUFSIZE;
1083
1084 if (copy_from_user
1085 (chip->data_buffer, (void __user *) buf, in_size)) {
d081d470 1086 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1087 return -EFAULT;
1088 }
1089
1090 /* atomic tpm command send and result receive */
1091 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1092
1093 atomic_set(&chip->data_pending, out_size);
d081d470 1094 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1095
1096 /* Set a timeout by which the reader must come claim the result */
fe3fd483 1097 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1da177e4
LT		 1098
1099 return in_size;
1100}
1da177e4
LT		 1101EXPORT_SYMBOL_GPL(tpm_write);
1102
3c2f606a
KJH		 1103ssize_t tpm_read(struct file *file, char __user *buf,
1104 size_t size, loff_t *off)
1da177e4
LT		 1105{
1106 struct tpm_chip *chip = file->private_data;
01476001 1107 ssize_t ret_size;
1da177e4 1108
5b44bd58 1109 del_singleshot_timer_sync(&chip->user_read_timer);
2e5c44c9 1110 flush_work_sync(&chip->work);
5b44bd58
KH		 1111 ret_size = atomic_read(&chip->data_pending);
1112 atomic_set(&chip->data_pending, 0);
1113 if (ret_size > 0) { /* relay data */
1114 if (size < ret_size)
1115 ret_size = size;
1da177e4 1116
d081d470 1117 mutex_lock(&chip->buffer_mutex);
f6a2382c 1118 if (copy_to_user(buf, chip->data_buffer, ret_size))
5b44bd58 1119 ret_size = -EFAULT;
d081d470 1120 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1121 }
1122
1123 return ret_size;
1124}
1da177e4
LT		 1125EXPORT_SYMBOL_GPL(tpm_read);
1126
e659a3fe 1127void tpm_remove_hardware(struct device *dev)
1da177e4 1128{
e659a3fe 1129 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1130
1131 if (chip == NULL) {
e659a3fe 1132 dev_err(dev, "No device data found\n");
1da177e4
LT		 1133 return;
1134 }
1135
1136 spin_lock(&driver_lock);
f02a9364 1137 list_del_rcu(&chip->list);
1da177e4 1138 spin_unlock(&driver_lock);
f02a9364 1139 synchronize_rcu();
1da177e4 1140
90dda520 1141 misc_deregister(&chip->vendor.miscdev);
90dda520 1142 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
55a82ab3 1143 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1144
5bd91f18
RM		 1145 /* write it this way to be explicit (chip->dev == dev) */
1146 put_device(chip->dev);
1da177e4 1147}
e659a3fe 1148EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4 1149
225a9be2
RA		 1150#define TPM_ORD_SAVESTATE cpu_to_be32(152)
1151#define SAVESTATE_RESULT_SIZE 10
1152
1153static struct tpm_input_header savestate_header = {
1154 .tag = TPM_TAG_RQU_COMMAND,
1155 .length = cpu_to_be32(10),
1156 .ordinal = TPM_ORD_SAVESTATE
1157};
1158
1da177e4
LT		 1159/*
1160 * We are about to suspend. Save the TPM state
1161 * so that it can be restored.
1162 */
ce2c87d4 1163int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1da177e4 1164{
ce2c87d4 1165 struct tpm_chip *chip = dev_get_drvdata(dev);
225a9be2
RA		 1166 struct tpm_cmd_t cmd;
1167 int rc;
1168
1169 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
2490c681 1170
1da177e4
LT		 1171 if (chip == NULL)
1172 return -ENODEV;
1173
225a9be2
RA		 1174 /* for buggy tpm, flush pcrs with extend to selected dummy */
1175 if (tpm_suspend_pcr) {
1176 cmd.header.in = pcrextend_header;
1177 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1178 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1179 TPM_DIGEST_SIZE);
1180 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1181 "extending dummy pcr before suspend");
1182 }
1183
1184 /* now do the actual savestate */
1185 cmd.header.in = savestate_header;
1186 rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
1187 "sending savestate before suspend");
1188 return rc;
1da177e4 1189}
1da177e4
LT		 1190EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1191
1192/*
1193 * Resume from a power safe. The BIOS already restored
1194 * the TPM state.
1195 */
ce2c87d4 1196int tpm_pm_resume(struct device *dev)
1da177e4 1197{
ce2c87d4 1198 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1199
1200 if (chip == NULL)
1201 return -ENODEV;
1202
1da177e4
LT		 1203 return 0;
1204}
1da177e4
LT		 1205EXPORT_SYMBOL_GPL(tpm_pm_resume);
1206
253115b7
RA		 1207/* In case vendor provided release function, call it too.*/
1208
1209void tpm_dev_vendor_release(struct tpm_chip *chip)
1210{
1211 if (chip->vendor.release)
1212 chip->vendor.release(chip->dev);
1213
1214 clear_bit(chip->dev_num, dev_mask);
1215 kfree(chip->vendor.miscdev.name);
1216}
1217EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1218
1219
5bd91f18
RM		 1220/*
1221 * Once all references to platform device are down to 0,
1222 * release all allocated structures.
5bd91f18 1223 */
cbb2ed4a 1224void tpm_dev_release(struct device *dev)
5bd91f18
RM		 1225{
1226 struct tpm_chip *chip = dev_get_drvdata(dev);
1227
253115b7 1228 tpm_dev_vendor_release(chip);
5bd91f18 1229
253115b7 1230 chip->release(dev);
5bd91f18
RM		 1231 kfree(chip);
1232}
253115b7 1233EXPORT_SYMBOL_GPL(tpm_dev_release);
5bd91f18 1234
1da177e4
LT		 1235/*
1236 * Called from tpm_<specific>.c probe function only for devices
1237 * the driver has determined it should claim. Prior to calling
1238 * this function the specific probe function has called pci_enable_device
1239 * upon errant exit from this function specific probe function should call
1240 * pci_disable_device
1241 */
f02a9364
RA		 1242struct tpm_chip *tpm_register_hardware(struct device *dev,
1243 const struct tpm_vendor_specific *entry)
1da177e4 1244{
6f9beccb
KJH		 1245#define DEVNAME_SIZE 7
1246
1247 char *devname;
1da177e4 1248 struct tpm_chip *chip;
1da177e4
LT		 1249
1250 /* Driver specific per-device data */
b888c87b 1251 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
8e39c933
PW		 1252 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1253
dd78c943
AM		 1254 if (chip == NULL || devname == NULL)
1255 goto out_free;
1da177e4 1256
d081d470
MK		 1257 mutex_init(&chip->buffer_mutex);
1258 mutex_init(&chip->tpm_mutex);
1da177e4
LT		 1259 INIT_LIST_HEAD(&chip->list);
1260
c4028958 1261 INIT_WORK(&chip->work, timeout_work);
09e12f9f 1262
40565f19
JS		 1263 setup_timer(&chip->user_read_timer, user_reader_timeout,
1264 (unsigned long)chip);
fe3fd483 1265
90dda520 1266 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4 1267
10685a95 1268 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1da177e4 1269
10685a95 1270 if (chip->dev_num >= TPM_NUM_DEVICES) {
b888c87b 1271 dev_err(dev, "No available tpm device numbers\n");
dd78c943 1272 goto out_free;
1da177e4 1273 } else if (chip->dev_num == 0)
90dda520 1274 chip->vendor.miscdev.minor = TPM_MINOR;
1da177e4 1275 else
90dda520 1276 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1da177e4 1277
10685a95
KJH		 1278 set_bit(chip->dev_num, dev_mask);
1279
6f9beccb 1280 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
90dda520 1281 chip->vendor.miscdev.name = devname;
1da177e4 1282
94fbcded 1283 chip->vendor.miscdev.parent = dev;
e659a3fe 1284 chip->dev = get_device(dev);
5bd91f18
RM		 1285 chip->release = dev->release;
1286 dev->release = tpm_dev_release;
1287 dev_set_drvdata(dev, chip);
1da177e4 1288
90dda520 1289 if (misc_register(&chip->vendor.miscdev)) {
e659a3fe 1290 dev_err(chip->dev,
1da177e4 1291 "unable to misc_register %s, minor %d\n",
90dda520
KJH		 1292 chip->vendor.miscdev.name,
1293 chip->vendor.miscdev.minor);
5bd91f18 1294 put_device(chip->dev);
e0dd03ca 1295 return NULL;
1da177e4
LT		 1296 }
1297
f33d9bd5 1298 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
5d469ec0 1299 misc_deregister(&chip->vendor.miscdev);
5bd91f18 1300 put_device(chip->dev);
f02a9364 1301
f33d9bd5
JG		 1302 return NULL;
1303 }
1da177e4 1304
55a82ab3
KJH		 1305 chip->bios_dir = tpm_bios_log_setup(devname);
1306
f02a9364
RA		 1307 /* Make chip available */
1308 spin_lock(&driver_lock);
1309 list_add_rcu(&chip->list, &tpm_chip_list);
1310 spin_unlock(&driver_lock);
1311
e0dd03ca 1312 return chip;
dd78c943
AM		 1313
1314out_free:
1315 kfree(chip);
1316 kfree(devname);
1317 return NULL;
1da177e4 1318}
1da177e4
LT		 1319EXPORT_SYMBOL_GPL(tpm_register_hardware);
1320
1da177e4
LT		 1321MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1322MODULE_DESCRIPTION("TPM Driver");
1323MODULE_VERSION("2.0");
1324MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)