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char: tpm: nuvoton: remove unused variable
[deliverable/linux.git] / drivers / char / tpm / tpm-interface.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).
0a418269 13 * Specifications at www.trustedcomputinggroup.org
1da177e4
LT		 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.
0a418269 19 *
1da177e4
LT		 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>
fd048866 30#include <linux/freezer.h>
d081d470 31
1da177e4 32#include "tpm.h"
e5dcd87f 33#include "tpm_eventlog.h"
1da177e4 34
9e18ee19
KJH		 35enum tpm_duration {
36 TPM_SHORT = 0,
37 TPM_MEDIUM = 1,
38 TPM_LONG = 2,
39 TPM_UNDEFINED,
40};
41
42#define TPM_MAX_ORDINAL 243
07b133e6
PH		 43#define TSC_MAX_ORDINAL 12
44#define TPM_PROTECTED_COMMAND 0x00
45#define TPM_CONNECTION_COMMAND 0x40
9e18ee19 46
9b3056cc
DT		 47/*
48 * Bug workaround - some TPM's don't flush the most
49 * recently changed pcr on suspend, so force the flush
50 * with an extend to the selected _unused_ non-volatile pcr.
51 */
52static int tpm_suspend_pcr;
53module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
54MODULE_PARM_DESC(suspend_pcr,
55 "PCR to use for dummy writes to faciltate flush on suspend.");
56
1da177e4
LT		 57static LIST_HEAD(tpm_chip_list);
58static DEFINE_SPINLOCK(driver_lock);
10685a95 59static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
1da177e4 60
9e18ee19
KJH		 61/*
62 * Array with one entry per ordinal defining the maximum amount
63 * of time the chip could take to return the result. The ordinal
64 * designation of short, medium or long is defined in a table in
65 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
66 * values of the SHORT, MEDIUM, and LONG durations are retrieved
67 * from the chip during initialization with a call to tpm_get_timeouts.
68 */
9e18ee19
KJH		 69static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
70 TPM_UNDEFINED, /* 0 */
71 TPM_UNDEFINED,
72 TPM_UNDEFINED,
73 TPM_UNDEFINED,
74 TPM_UNDEFINED,
75 TPM_UNDEFINED, /* 5 */
76 TPM_UNDEFINED,
77 TPM_UNDEFINED,
78 TPM_UNDEFINED,
79 TPM_UNDEFINED,
80 TPM_SHORT, /* 10 */
81 TPM_SHORT,
82 TPM_MEDIUM,
83 TPM_LONG,
84 TPM_LONG,
85 TPM_MEDIUM, /* 15 */
86 TPM_SHORT,
87 TPM_SHORT,
88 TPM_MEDIUM,
89 TPM_LONG,
90 TPM_SHORT, /* 20 */
91 TPM_SHORT,
92 TPM_MEDIUM,
93 TPM_MEDIUM,
94 TPM_MEDIUM,
95 TPM_SHORT, /* 25 */
96 TPM_SHORT,
97 TPM_MEDIUM,
98 TPM_SHORT,
99 TPM_SHORT,
100 TPM_MEDIUM, /* 30 */
101 TPM_LONG,
102 TPM_MEDIUM,
103 TPM_SHORT,
104 TPM_SHORT,
105 TPM_SHORT, /* 35 */
106 TPM_MEDIUM,
107 TPM_MEDIUM,
108 TPM_UNDEFINED,
109 TPM_UNDEFINED,
110 TPM_MEDIUM, /* 40 */
111 TPM_LONG,
112 TPM_MEDIUM,
113 TPM_SHORT,
114 TPM_SHORT,
115 TPM_SHORT, /* 45 */
116 TPM_SHORT,
117 TPM_SHORT,
118 TPM_SHORT,
119 TPM_LONG,
120 TPM_MEDIUM, /* 50 */
121 TPM_MEDIUM,
122 TPM_UNDEFINED,
123 TPM_UNDEFINED,
124 TPM_UNDEFINED,
125 TPM_UNDEFINED, /* 55 */
126 TPM_UNDEFINED,
127 TPM_UNDEFINED,
128 TPM_UNDEFINED,
129 TPM_UNDEFINED,
130 TPM_MEDIUM, /* 60 */
131 TPM_MEDIUM,
132 TPM_MEDIUM,
133 TPM_SHORT,
134 TPM_SHORT,
135 TPM_MEDIUM, /* 65 */
136 TPM_UNDEFINED,
137 TPM_UNDEFINED,
138 TPM_UNDEFINED,
139 TPM_UNDEFINED,
140 TPM_SHORT, /* 70 */
141 TPM_SHORT,
142 TPM_UNDEFINED,
143 TPM_UNDEFINED,
144 TPM_UNDEFINED,
145 TPM_UNDEFINED, /* 75 */
146 TPM_UNDEFINED,
147 TPM_UNDEFINED,
148 TPM_UNDEFINED,
149 TPM_UNDEFINED,
150 TPM_LONG, /* 80 */
151 TPM_UNDEFINED,
152 TPM_MEDIUM,
153 TPM_LONG,
154 TPM_SHORT,
155 TPM_UNDEFINED, /* 85 */
156 TPM_UNDEFINED,
157 TPM_UNDEFINED,
158 TPM_UNDEFINED,
159 TPM_UNDEFINED,
160 TPM_SHORT, /* 90 */
161 TPM_SHORT,
162 TPM_SHORT,
163 TPM_SHORT,
164 TPM_SHORT,
165 TPM_UNDEFINED, /* 95 */
166 TPM_UNDEFINED,
167 TPM_UNDEFINED,
168 TPM_UNDEFINED,
169 TPM_UNDEFINED,
170 TPM_MEDIUM, /* 100 */
171 TPM_SHORT,
172 TPM_SHORT,
173 TPM_UNDEFINED,
174 TPM_UNDEFINED,
175 TPM_UNDEFINED, /* 105 */
176 TPM_UNDEFINED,
177 TPM_UNDEFINED,
178 TPM_UNDEFINED,
179 TPM_UNDEFINED,
180 TPM_SHORT, /* 110 */
181 TPM_SHORT,
182 TPM_SHORT,
183 TPM_SHORT,
184 TPM_SHORT,
185 TPM_SHORT, /* 115 */
186 TPM_SHORT,
187 TPM_SHORT,
188 TPM_UNDEFINED,
189 TPM_UNDEFINED,
190 TPM_LONG, /* 120 */
191 TPM_LONG,
192 TPM_MEDIUM,
193 TPM_UNDEFINED,
194 TPM_SHORT,
195 TPM_SHORT, /* 125 */
196 TPM_SHORT,
197 TPM_LONG,
198 TPM_SHORT,
199 TPM_SHORT,
200 TPM_SHORT, /* 130 */
201 TPM_MEDIUM,
202 TPM_UNDEFINED,
203 TPM_SHORT,
204 TPM_MEDIUM,
205 TPM_UNDEFINED, /* 135 */
206 TPM_UNDEFINED,
207 TPM_UNDEFINED,
208 TPM_UNDEFINED,
209 TPM_UNDEFINED,
210 TPM_SHORT, /* 140 */
211 TPM_SHORT,
212 TPM_UNDEFINED,
213 TPM_UNDEFINED,
214 TPM_UNDEFINED,
215 TPM_UNDEFINED, /* 145 */
216 TPM_UNDEFINED,
217 TPM_UNDEFINED,
218 TPM_UNDEFINED,
219 TPM_UNDEFINED,
220 TPM_SHORT, /* 150 */
221 TPM_MEDIUM,
222 TPM_MEDIUM,
223 TPM_SHORT,
224 TPM_SHORT,
225 TPM_UNDEFINED, /* 155 */
226 TPM_UNDEFINED,
227 TPM_UNDEFINED,
228 TPM_UNDEFINED,
229 TPM_UNDEFINED,
230 TPM_SHORT, /* 160 */
231 TPM_SHORT,
232 TPM_SHORT,
233 TPM_SHORT,
234 TPM_UNDEFINED,
235 TPM_UNDEFINED, /* 165 */
236 TPM_UNDEFINED,
237 TPM_UNDEFINED,
238 TPM_UNDEFINED,
239 TPM_UNDEFINED,
240 TPM_LONG, /* 170 */
241 TPM_UNDEFINED,
242 TPM_UNDEFINED,
243 TPM_UNDEFINED,
244 TPM_UNDEFINED,
245 TPM_UNDEFINED, /* 175 */
246 TPM_UNDEFINED,
247 TPM_UNDEFINED,
248 TPM_UNDEFINED,
249 TPM_UNDEFINED,
250 TPM_MEDIUM, /* 180 */
251 TPM_SHORT,
252 TPM_MEDIUM,
253 TPM_MEDIUM,
254 TPM_MEDIUM,
255 TPM_MEDIUM, /* 185 */
256 TPM_SHORT,
257 TPM_UNDEFINED,
258 TPM_UNDEFINED,
259 TPM_UNDEFINED,
260 TPM_UNDEFINED, /* 190 */
261 TPM_UNDEFINED,
262 TPM_UNDEFINED,
263 TPM_UNDEFINED,
264 TPM_UNDEFINED,
265 TPM_UNDEFINED, /* 195 */
266 TPM_UNDEFINED,
267 TPM_UNDEFINED,
268 TPM_UNDEFINED,
269 TPM_UNDEFINED,
270 TPM_SHORT, /* 200 */
271 TPM_UNDEFINED,
272 TPM_UNDEFINED,
273 TPM_UNDEFINED,
274 TPM_SHORT,
275 TPM_SHORT, /* 205 */
276 TPM_SHORT,
277 TPM_SHORT,
278 TPM_SHORT,
279 TPM_SHORT,
280 TPM_MEDIUM, /* 210 */
281 TPM_UNDEFINED,
282 TPM_MEDIUM,
283 TPM_MEDIUM,
284 TPM_MEDIUM,
285 TPM_UNDEFINED, /* 215 */
286 TPM_MEDIUM,
287 TPM_UNDEFINED,
288 TPM_UNDEFINED,
289 TPM_SHORT,
290 TPM_SHORT, /* 220 */
291 TPM_SHORT,
292 TPM_SHORT,
293 TPM_SHORT,
294 TPM_SHORT,
295 TPM_UNDEFINED, /* 225 */
296 TPM_UNDEFINED,
297 TPM_UNDEFINED,
298 TPM_UNDEFINED,
299 TPM_UNDEFINED,
300 TPM_SHORT, /* 230 */
301 TPM_LONG,
302 TPM_MEDIUM,
303 TPM_UNDEFINED,
304 TPM_UNDEFINED,
305 TPM_UNDEFINED, /* 235 */
306 TPM_UNDEFINED,
307 TPM_UNDEFINED,
308 TPM_UNDEFINED,
309 TPM_UNDEFINED,
310 TPM_SHORT, /* 240 */
311 TPM_UNDEFINED,
312 TPM_MEDIUM,
313};
314
1da177e4
LT		 315static void user_reader_timeout(unsigned long ptr)
316{
317 struct tpm_chip *chip = (struct tpm_chip *) ptr;
318
09e12f9f
KJH		 319 schedule_work(&chip->work);
320}
321
c4028958 322static void timeout_work(struct work_struct *work)
09e12f9f 323{
c4028958 324 struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
09e12f9f 325
d081d470 326 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 327 atomic_set(&chip->data_pending, 0);
328 memset(chip->data_buffer, 0, TPM_BUFSIZE);
d081d470 329 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 330}
331
9e18ee19
KJH		 332/*
333 * Returns max number of jiffies to wait
334 */
335unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
336 u32 ordinal)
337{
338 int duration_idx = TPM_UNDEFINED;
339 int duration = 0;
07b133e6 340 u8 category = (ordinal >> 24) & 0xFF;
9e18ee19 341
07b133e6
PH		 342 if ((category == TPM_PROTECTED_COMMAND && ordinal < TPM_MAX_ORDINAL) ||
343 (category == TPM_CONNECTION_COMMAND && ordinal < TSC_MAX_ORDINAL))
9e18ee19 344 duration_idx = tpm_ordinal_duration[ordinal];
9e18ee19 345
8d1dc20e 346 if (duration_idx != TPM_UNDEFINED)
36b20020 347 duration = chip->vendor.duration[duration_idx];
8d1dc20e 348 if (duration <= 0)
9e18ee19 349 return 2 * 60 * HZ;
8d1dc20e
LT		 350 else
351 return duration;
9e18ee19
KJH		 352}
353EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
354
1da177e4
LT		 355/*
356 * Internal kernel interface to transmit TPM commands
357 */
358static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
359 size_t bufsiz)
360{
d9e5b6bf 361 ssize_t rc;
9e18ee19 362 u32 count, ordinal;
700d8bdc 363 unsigned long stop;
1da177e4 364
6b07d30a
PH		 365 if (bufsiz > TPM_BUFSIZE)
366 bufsiz = TPM_BUFSIZE;
367
81179bb6 368 count = be32_to_cpu(*((__be32 *) (buf + 2)));
9e18ee19 369 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
1da177e4
LT		 370 if (count == 0)
371 return -ENODATA;
372 if (count > bufsiz) {
e659a3fe 373 dev_err(chip->dev,
0a418269 374 "invalid count value %x %zx\n", count, bufsiz);
1da177e4
LT		 375 return -E2BIG;
376 }
377
d081d470 378 mutex_lock(&chip->tpm_mutex);
1da177e4 379
0a418269
PH		 380 rc = chip->vendor.send(chip, (u8 *) buf, count);
381 if (rc < 0) {
e659a3fe 382 dev_err(chip->dev,
d9e5b6bf
KH		 383 "tpm_transmit: tpm_send: error %zd\n", rc);
384 goto out;
1da177e4
LT		 385 }
386
27084efe
LD		 387 if (chip->vendor.irq)
388 goto out_recv;
389
9e18ee19 390 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
1da177e4 391 do {
90dda520
KJH		 392 u8 status = chip->vendor.status(chip);
393 if ((status & chip->vendor.req_complete_mask) ==
394 chip->vendor.req_complete_val)
1da177e4 395 goto out_recv;
d9e5b6bf 396
1f866057 397 if (chip->vendor.req_canceled(chip, status)) {
e659a3fe 398 dev_err(chip->dev, "Operation Canceled\n");
d9e5b6bf
KH		 399 rc = -ECANCELED;
400 goto out;
401 }
402
403 msleep(TPM_TIMEOUT); /* CHECK */
1da177e4 404 rmb();
700d8bdc 405 } while (time_before(jiffies, stop));
1da177e4 406
90dda520 407 chip->vendor.cancel(chip);
e659a3fe 408 dev_err(chip->dev, "Operation Timed out\n");
d9e5b6bf
KH		 409 rc = -ETIME;
410 goto out;
1da177e4
LT		 411
412out_recv:
90dda520 413 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
d9e5b6bf 414 if (rc < 0)
e659a3fe 415 dev_err(chip->dev,
d9e5b6bf
KH		 416 "tpm_transmit: tpm_recv: error %zd\n", rc);
417out:
d081d470 418 mutex_unlock(&chip->tpm_mutex);
d9e5b6bf 419 return rc;
1da177e4
LT		 420}
421
422#define TPM_DIGEST_SIZE 20
beed53a1 423#define TPM_RET_CODE_IDX 6
beed53a1
KJH		 424
425enum tpm_capabilities {
08837438
RA		 426 TPM_CAP_FLAG = cpu_to_be32(4),
427 TPM_CAP_PROP = cpu_to_be32(5),
428 CAP_VERSION_1_1 = cpu_to_be32(0x06),
429 CAP_VERSION_1_2 = cpu_to_be32(0x1A)
beed53a1
KJH		 430};
431
432enum tpm_sub_capabilities {
08837438
RA		 433 TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
434 TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
435 TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
436 TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
437 TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
438 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
439 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
beed53a1 440
1da177e4
LT		 441};
442
08837438
RA		 443static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
444 int len, const char *desc)
beed53a1
KJH		 445{
446 int err;
447
0a418269 448 len = tpm_transmit(chip, (u8 *) cmd, len);
beed53a1
KJH		 449 if (len < 0)
450 return len;
b9e3238a
RA		 451 else if (len < TPM_HEADER_SIZE)
452 return -EFAULT;
453
454 err = be32_to_cpu(cmd->header.out.return_code);
c584af19 455 if (err != 0 && desc)
b9e3238a
RA		 456 dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
457
458 return err;
beed53a1
KJH		 459}
460
08837438
RA		 461#define TPM_INTERNAL_RESULT_SIZE 200
462#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
463#define TPM_ORD_GET_CAP cpu_to_be32(101)
41ab999c 464#define TPM_ORD_GET_RANDOM cpu_to_be32(70)
08837438
RA		 465
466static const struct tpm_input_header tpm_getcap_header = {
467 .tag = TPM_TAG_RQU_COMMAND,
468 .length = cpu_to_be32(22),
469 .ordinal = TPM_ORD_GET_CAP
470};
471
472ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
473 const char *desc)
474{
475 struct tpm_cmd_t tpm_cmd;
476 int rc;
477 struct tpm_chip *chip = dev_get_drvdata(dev);
478
479 tpm_cmd.header.in = tpm_getcap_header;
480 if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
481 tpm_cmd.params.getcap_in.cap = subcap_id;
482 /*subcap field not necessary */
483 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
484 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
485 } else {
486 if (subcap_id == TPM_CAP_FLAG_PERM ||
487 subcap_id == TPM_CAP_FLAG_VOL)
488 tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
489 else
490 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
491 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
492 tpm_cmd.params.getcap_in.subcap = subcap_id;
493 }
494 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
495 if (!rc)
496 *cap = tpm_cmd.params.getcap_out.cap;
497 return rc;
498}
499
08e96e48
KJH		 500void tpm_gen_interrupt(struct tpm_chip *chip)
501{
08837438 502 struct tpm_cmd_t tpm_cmd;
08e96e48
KJH		 503 ssize_t rc;
504
08837438
RA		 505 tpm_cmd.header.in = tpm_getcap_header;
506 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
507 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
508 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 509
08837438 510 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 511 "attempting to determine the timeouts");
512}
513EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
514
c584af19
JG		 515#define TPM_ORD_STARTUP cpu_to_be32(153)
516#define TPM_ST_CLEAR cpu_to_be16(1)
517#define TPM_ST_STATE cpu_to_be16(2)
518#define TPM_ST_DEACTIVATED cpu_to_be16(3)
519static const struct tpm_input_header tpm_startup_header = {
520 .tag = TPM_TAG_RQU_COMMAND,
521 .length = cpu_to_be32(12),
522 .ordinal = TPM_ORD_STARTUP
523};
524
525static int tpm_startup(struct tpm_chip *chip, __be16 startup_type)
526{
527 struct tpm_cmd_t start_cmd;
528 start_cmd.header.in = tpm_startup_header;
529 start_cmd.params.startup_in.startup_type = startup_type;
530 return transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE,
531 "attempting to start the TPM");
532}
533
2b30a90f 534int tpm_get_timeouts(struct tpm_chip *chip)
08e96e48 535{
08837438
RA		 536 struct tpm_cmd_t tpm_cmd;
537 struct timeout_t *timeout_cap;
538 struct duration_t *duration_cap;
08e96e48
KJH		 539 ssize_t rc;
540 u32 timeout;
e3e1a1e1 541 unsigned int scale = 1;
08e96e48 542
08837438
RA		 543 tpm_cmd.header.in = tpm_getcap_header;
544 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
545 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
546 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
c584af19 547 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, NULL);
08e96e48 548
c584af19
JG		 549 if (rc == TPM_ERR_INVALID_POSTINIT) {
550 /* The TPM is not started, we are the first to talk to it.
551 Execute a startup command. */
552 dev_info(chip->dev, "Issuing TPM_STARTUP");
553 if (tpm_startup(chip, TPM_ST_CLEAR))
554 return rc;
555
556 tpm_cmd.header.in = tpm_getcap_header;
557 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
558 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
559 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
560 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
561 NULL);
562 }
563 if (rc) {
564 dev_err(chip->dev,
565 "A TPM error (%zd) occurred attempting to determine the timeouts\n",
566 rc);
08e96e48 567 goto duration;
c584af19 568 }
08e96e48 569
829bf067
SB		 570 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
571 be32_to_cpu(tpm_cmd.header.out.length)
572 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
2b30a90f 573 return -EINVAL;
08e96e48 574
08837438 575 timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
08e96e48 576 /* Don't overwrite default if value is 0 */
08837438 577 timeout = be32_to_cpu(timeout_cap->a);
e3e1a1e1
SB		 578 if (timeout && timeout < 1000) {
579 /* timeouts in msec rather usec */
580 scale = 1000;
62592101 581 chip->vendor.timeout_adjusted = true;
e3e1a1e1 582 }
08e96e48 583 if (timeout)
e3e1a1e1 584 chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
08837438 585 timeout = be32_to_cpu(timeout_cap->b);
08e96e48 586 if (timeout)
e3e1a1e1 587 chip->vendor.timeout_b = usecs_to_jiffies(timeout * scale);
08837438 588 timeout = be32_to_cpu(timeout_cap->c);
08e96e48 589 if (timeout)
e3e1a1e1 590 chip->vendor.timeout_c = usecs_to_jiffies(timeout * scale);
08837438 591 timeout = be32_to_cpu(timeout_cap->d);
08e96e48 592 if (timeout)
e3e1a1e1 593 chip->vendor.timeout_d = usecs_to_jiffies(timeout * scale);
08e96e48
KJH		 594
595duration:
08837438
RA		 596 tpm_cmd.header.in = tpm_getcap_header;
597 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
598 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
599 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
08e96e48 600
08837438 601 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 602 "attempting to determine the durations");
603 if (rc)
2b30a90f 604 return rc;
08e96e48 605
979b1406
SB		 606 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
607 be32_to_cpu(tpm_cmd.header.out.length)
608 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
2b30a90f 609 return -EINVAL;
979b1406 610
08837438 611 duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
08e96e48 612 chip->vendor.duration[TPM_SHORT] =
08837438 613 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
e934acca
SB		 614 chip->vendor.duration[TPM_MEDIUM] =
615 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
616 chip->vendor.duration[TPM_LONG] =
617 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
618
292cf4a8
VK		 619 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
620 * value wrong and apparently reports msecs rather than usecs. So we
621 * fix up the resulting too-small TPM_SHORT value to make things work.
e934acca 622 * We also scale the TPM_MEDIUM and -_LONG values by 1000.
292cf4a8 623 */
e934acca 624 if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
292cf4a8 625 chip->vendor.duration[TPM_SHORT] = HZ;
e934acca
SB		 626 chip->vendor.duration[TPM_MEDIUM] *= 1000;
627 chip->vendor.duration[TPM_LONG] *= 1000;
04ab2293 628 chip->vendor.duration_adjusted = true;
e934acca
SB		 629 dev_info(chip->dev, "Adjusting TPM timeout parameters.");
630 }
2b30a90f 631 return 0;
08e96e48
KJH		 632}
633EXPORT_SYMBOL_GPL(tpm_get_timeouts);
634
d97c6ade
SB		 635#define TPM_ORD_CONTINUE_SELFTEST 83
636#define CONTINUE_SELFTEST_RESULT_SIZE 10
637
638static struct tpm_input_header continue_selftest_header = {
639 .tag = TPM_TAG_RQU_COMMAND,
640 .length = cpu_to_be32(10),
641 .ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
642};
643
644/**
645 * tpm_continue_selftest -- run TPM's selftest
646 * @chip: TPM chip to use
647 *
648 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
649 * a TPM error code.
650 */
68d6e671 651static int tpm_continue_selftest(struct tpm_chip *chip)
08e96e48 652{
d97c6ade
SB		 653 int rc;
654 struct tpm_cmd_t cmd;
08e96e48 655
d97c6ade
SB		 656 cmd.header.in = continue_selftest_header;
657 rc = transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
658 "continue selftest");
659 return rc;
08e96e48 660}
08e96e48 661
0a418269 662ssize_t tpm_show_enabled(struct device *dev, struct device_attribute *attr,
08e96e48
KJH		 663 char *buf)
664{
08837438 665 cap_t cap;
08e96e48
KJH		 666 ssize_t rc;
667
08837438
RA		 668 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
669 "attempting to determine the permanent enabled state");
670 if (rc)
08e96e48 671 return 0;
ec288bd3 672
08837438 673 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
ec288bd3 674 return rc;
08e96e48
KJH		 675}
676EXPORT_SYMBOL_GPL(tpm_show_enabled);
677
0a418269 678ssize_t tpm_show_active(struct device *dev, struct device_attribute *attr,
08e96e48
KJH		 679 char *buf)
680{
08837438 681 cap_t cap;
08e96e48
KJH		 682 ssize_t rc;
683
08837438
RA		 684 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
685 "attempting to determine the permanent active state");
686 if (rc)
08e96e48 687 return 0;
ec288bd3 688
08837438 689 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
ec288bd3 690 return rc;
08e96e48
KJH		 691}
692EXPORT_SYMBOL_GPL(tpm_show_active);
693
0a418269 694ssize_t tpm_show_owned(struct device *dev, struct device_attribute *attr,
08e96e48
KJH		 695 char *buf)
696{
08837438 697 cap_t cap;
08e96e48
KJH		 698 ssize_t rc;
699
08837438
RA		 700 rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
701 "attempting to determine the owner state");
702 if (rc)
08e96e48 703 return 0;
ec288bd3 704
08837438 705 rc = sprintf(buf, "%d\n", cap.owned);
ec288bd3 706 return rc;
08e96e48
KJH		 707}
708EXPORT_SYMBOL_GPL(tpm_show_owned);
709
0a418269
PH		 710ssize_t tpm_show_temp_deactivated(struct device *dev,
711 struct device_attribute *attr, char *buf)
08e96e48 712{
08837438 713 cap_t cap;
08e96e48
KJH		 714 ssize_t rc;
715
08837438
RA		 716 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
717 "attempting to determine the temporary state");
718 if (rc)
08e96e48 719 return 0;
ec288bd3 720
08837438 721 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
ec288bd3 722 return rc;
08e96e48
KJH		 723}
724EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
725
659aaf2b
RA		 726/*
727 * tpm_chip_find_get - return tpm_chip for given chip number
728 */
729static struct tpm_chip *tpm_chip_find_get(int chip_num)
730{
8920d5ad 731 struct tpm_chip *pos, *chip = NULL;
659aaf2b
RA		 732
733 rcu_read_lock();
734 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
735 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
736 continue;
737
8920d5ad
RA		 738 if (try_module_get(pos->dev->driver->owner)) {
739 chip = pos;
659aaf2b 740 break;
8920d5ad 741 }
659aaf2b
RA		 742 }
743 rcu_read_unlock();
8920d5ad 744 return chip;
659aaf2b
RA		 745}
746
747#define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
748#define READ_PCR_RESULT_SIZE 30
749static struct tpm_input_header pcrread_header = {
750 .tag = TPM_TAG_RQU_COMMAND,
751 .length = cpu_to_be32(14),
752 .ordinal = TPM_ORDINAL_PCRREAD
1da177e4
LT		 753};
754
68d6e671 755static int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
659aaf2b
RA		 756{
757 int rc;
758 struct tpm_cmd_t cmd;
759
760 cmd.header.in = pcrread_header;
761 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
23acb98d 762 rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
659aaf2b
RA		 763 "attempting to read a pcr value");
764
765 if (rc == 0)
766 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
767 TPM_DIGEST_SIZE);
768 return rc;
769}
770
771/**
772 * tpm_pcr_read - read a pcr value
0a418269 773 * @chip_num: tpm idx # or ANY
659aaf2b 774 * @pcr_idx: pcr idx to retrieve
0a418269
PH		 775 * @res_buf: TPM_PCR value
776 * size of res_buf is 20 bytes (or NULL if you don't care)
659aaf2b
RA		 777 *
778 * The TPM driver should be built-in, but for whatever reason it
779 * isn't, protect against the chip disappearing, by incrementing
780 * the module usage count.
781 */
782int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
783{
784 struct tpm_chip *chip;
785 int rc;
786
787 chip = tpm_chip_find_get(chip_num);
788 if (chip == NULL)
789 return -ENODEV;
790 rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
a0e39349 791 tpm_chip_put(chip);
659aaf2b
RA		 792 return rc;
793}
794EXPORT_SYMBOL_GPL(tpm_pcr_read);
795
796/**
797 * tpm_pcr_extend - extend pcr value with hash
0a418269 798 * @chip_num: tpm idx # or AN&
659aaf2b 799 * @pcr_idx: pcr idx to extend
0a418269 800 * @hash: hash value used to extend pcr value
659aaf2b
RA		 801 *
802 * The TPM driver should be built-in, but for whatever reason it
803 * isn't, protect against the chip disappearing, by incrementing
804 * the module usage count.
805 */
806#define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
0afd9056 807#define EXTEND_PCR_RESULT_SIZE 34
659aaf2b
RA		 808static struct tpm_input_header pcrextend_header = {
809 .tag = TPM_TAG_RQU_COMMAND,
810 .length = cpu_to_be32(34),
811 .ordinal = TPM_ORD_PCR_EXTEND
812};
813
814int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
815{
816 struct tpm_cmd_t cmd;
817 int rc;
818 struct tpm_chip *chip;
819
820 chip = tpm_chip_find_get(chip_num);
821 if (chip == NULL)
822 return -ENODEV;
823
824 cmd.header.in = pcrextend_header;
659aaf2b
RA		 825 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
826 memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
0afd9056 827 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
659aaf2b
RA		 828 "attempting extend a PCR value");
829
a0e39349 830 tpm_chip_put(chip);
659aaf2b
RA		 831 return rc;
832}
833EXPORT_SYMBOL_GPL(tpm_pcr_extend);
834
68d6e671
SB		 835/**
836 * tpm_do_selftest - have the TPM continue its selftest and wait until it
837 * can receive further commands
838 * @chip: TPM chip to use
839 *
840 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
841 * a TPM error code.
842 */
843int tpm_do_selftest(struct tpm_chip *chip)
844{
845 int rc;
68d6e671 846 unsigned int loops;
4643826a 847 unsigned int delay_msec = 100;
68d6e671 848 unsigned long duration;
24ebe667 849 struct tpm_cmd_t cmd;
68d6e671 850
0a418269 851 duration = tpm_calc_ordinal_duration(chip, TPM_ORD_CONTINUE_SELFTEST);
68d6e671
SB		 852
853 loops = jiffies_to_msecs(duration) / delay_msec;
854
855 rc = tpm_continue_selftest(chip);
856 /* This may fail if there was no TPM driver during a suspend/resume
857 * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST)
858 */
859 if (rc)
860 return rc;
861
862 do {
24ebe667
RA		 863 /* Attempt to read a PCR value */
864 cmd.header.in = pcrread_header;
865 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(0);
866 rc = tpm_transmit(chip, (u8 *) &cmd, READ_PCR_RESULT_SIZE);
4643826a
JG		 867 /* Some buggy TPMs will not respond to tpm_tis_ready() for
868 * around 300ms while the self test is ongoing, keep trying
869 * until the self test duration expires. */
870 if (rc == -ETIME) {
871 dev_info(chip->dev, HW_ERR "TPM command timed out during continue self test");
872 msleep(delay_msec);
873 continue;
874 }
24ebe667
RA		 875
876 if (rc < TPM_HEADER_SIZE)
877 return -EFAULT;
878
879 rc = be32_to_cpu(cmd.header.out.return_code);
be405411
SB		 880 if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
881 dev_info(chip->dev,
882 "TPM is disabled/deactivated (0x%X)\n", rc);
883 /* TPM is disabled and/or deactivated; driver can
884 * proceed and TPM does handle commands for
885 * suspend/resume correctly
886 */
887 return 0;
888 }
68d6e671
SB		 889 if (rc != TPM_WARN_DOING_SELFTEST)
890 return rc;
891 msleep(delay_msec);
892 } while (--loops > 0);
893
894 return rc;
895}
896EXPORT_SYMBOL_GPL(tpm_do_selftest);
897
c749ba91
MZ		 898int tpm_send(u32 chip_num, void *cmd, size_t buflen)
899{
900 struct tpm_chip *chip;
901 int rc;
902
903 chip = tpm_chip_find_get(chip_num);
904 if (chip == NULL)
905 return -ENODEV;
906
907 rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
908
909 tpm_chip_put(chip);
910 return rc;
911}
912EXPORT_SYMBOL_GPL(tpm_send);
913
6659ca2a
KH		 914ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
915 char *buf)
1da177e4 916{
08837438 917 cap_t cap;
659aaf2b 918 u8 digest[TPM_DIGEST_SIZE];
beed53a1 919 ssize_t rc;
81179bb6 920 int i, j, num_pcrs;
1da177e4 921 char *str = buf;
e659a3fe 922 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 923
08837438 924 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
beed53a1 925 "attempting to determine the number of PCRS");
08837438 926 if (rc)
e234bc97 927 return 0;
1da177e4 928
08837438 929 num_pcrs = be32_to_cpu(cap.num_pcrs);
1da177e4 930 for (i = 0; i < num_pcrs; i++) {
659aaf2b 931 rc = __tpm_pcr_read(chip, i, digest);
beed53a1 932 if (rc)
08837438 933 break;
1da177e4
LT		 934 str += sprintf(str, "PCR-%02d: ", i);
935 for (j = 0; j < TPM_DIGEST_SIZE; j++)
659aaf2b 936 str += sprintf(str, "%02X ", digest[j]);
1da177e4
LT		 937 str += sprintf(str, "\n");
938 }
939 return str - buf;
940}
6659ca2a 941EXPORT_SYMBOL_GPL(tpm_show_pcrs);
1da177e4
LT		 942
943#define READ_PUBEK_RESULT_SIZE 314
08837438 944#define TPM_ORD_READPUBEK cpu_to_be32(124)
81198078 945static struct tpm_input_header tpm_readpubek_header = {
08837438
RA		 946 .tag = TPM_TAG_RQU_COMMAND,
947 .length = cpu_to_be32(30),
948 .ordinal = TPM_ORD_READPUBEK
1da177e4
LT		 949};
950
6659ca2a
KH		 951ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
952 char *buf)
1da177e4 953{
2df7111f 954 u8 *data;
08837438 955 struct tpm_cmd_t tpm_cmd;
beed53a1 956 ssize_t err;
81179bb6 957 int i, rc;
1da177e4
LT		 958 char *str = buf;
959
e659a3fe 960 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 961
08837438
RA		 962 tpm_cmd.header.in = tpm_readpubek_header;
963 err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
beed53a1
KJH		 964 "attempting to read the PUBEK");
965 if (err)
34d6e075 966 goto out;
1da177e4 967
0a418269 968 /*
1da177e4
LT		 969 ignore header 10 bytes
970 algorithm 32 bits (1 == RSA )
971 encscheme 16 bits
972 sigscheme 16 bits
0a418269 973 parameters (RSA 12->bytes: keybit, #primes, expbit)
1da177e4
LT		 974 keylenbytes 32 bits
975 256 byte modulus
976 ignore checksum 20 bytes
977 */
08837438 978 data = tpm_cmd.params.readpubek_out_buffer;
1da177e4
LT		 979 str +=
980 sprintf(str,
5a79444f
SB		 981 "Algorithm: %02X %02X %02X %02X\n"
982 "Encscheme: %02X %02X\n"
983 "Sigscheme: %02X %02X\n"
984 "Parameters: %02X %02X %02X %02X "
985 "%02X %02X %02X %02X "
986 "%02X %02X %02X %02X\n"
987 "Modulus length: %d\n"
988 "Modulus:\n",
989 data[0], data[1], data[2], data[3],
990 data[4], data[5],
991 data[6], data[7],
992 data[12], data[13], data[14], data[15],
993 data[16], data[17], data[18], data[19],
994 data[20], data[21], data[22], data[23],
995 be32_to_cpu(*((__be32 *) (data + 24))));
1da177e4
LT		 996
997 for (i = 0; i < 256; i++) {
5a79444f 998 str += sprintf(str, "%02X ", data[i + 28]);
1da177e4
LT		 999 if ((i + 1) % 16 == 0)
1000 str += sprintf(str, "\n");
1001 }
34d6e075 1002out:
beed53a1 1003 rc = str - buf;
2df7111f 1004 return rc;
1da177e4 1005}
6659ca2a 1006EXPORT_SYMBOL_GPL(tpm_show_pubek);
1da177e4 1007
1da177e4 1008
6659ca2a
KH		 1009ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
1010 char *buf)
1da177e4 1011{
08837438 1012 cap_t cap;
beed53a1 1013 ssize_t rc;
1da177e4
LT		 1014 char *str = buf;
1015
08837438 1016 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
beed53a1 1017 "attempting to determine the manufacturer");
08837438 1018 if (rc)
beed53a1 1019 return 0;
1da177e4 1020 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438 1021 be32_to_cpu(cap.manufacturer_id));
1da177e4 1022
e907481b 1023 /* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
08837438
RA		 1024 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
1025 "attempting to determine the 1.2 version");
e907481b
JG		 1026 if (!rc) {
1027 str += sprintf(str,
1028 "TCG version: %d.%d\nFirmware version: %d.%d\n",
1029 cap.tpm_version_1_2.Major,
1030 cap.tpm_version_1_2.Minor,
1031 cap.tpm_version_1_2.revMajor,
1032 cap.tpm_version_1_2.revMinor);
1033 } else {
1034 /* Otherwise just use TPM_STRUCT_VER */
1035 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
1036 "attempting to determine the 1.1 version");
1037 if (rc)
1038 return 0;
1039 str += sprintf(str,
1040 "TCG version: %d.%d\nFirmware version: %d.%d\n",
1041 cap.tpm_version.Major,
1042 cap.tpm_version.Minor,
1043 cap.tpm_version.revMajor,
1044 cap.tpm_version.revMinor);
1045 }
1046
08e96e48
KJH		 1047 return str - buf;
1048}
e907481b 1049EXPORT_SYMBOL_GPL(tpm_show_caps);
08e96e48 1050
04ab2293
SB		 1051ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
1052 char *buf)
1053{
1054 struct tpm_chip *chip = dev_get_drvdata(dev);
1055
403d1d03
SB		 1056 if (chip->vendor.duration[TPM_LONG] == 0)
1057 return 0;
1058
04ab2293
SB		 1059 return sprintf(buf, "%d %d %d [%s]\n",
1060 jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
1061 jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
1062 jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
1063 chip->vendor.duration_adjusted
1064 ? "adjusted" : "original");
1065}
1066EXPORT_SYMBOL_GPL(tpm_show_durations);
1067
62592101
SB		 1068ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
1069 char *buf)
1070{
1071 struct tpm_chip *chip = dev_get_drvdata(dev);
1072
1073 return sprintf(buf, "%d %d %d %d [%s]\n",
1074 jiffies_to_usecs(chip->vendor.timeout_a),
1075 jiffies_to_usecs(chip->vendor.timeout_b),
1076 jiffies_to_usecs(chip->vendor.timeout_c),
1077 jiffies_to_usecs(chip->vendor.timeout_d),
1078 chip->vendor.timeout_adjusted
1079 ? "adjusted" : "original");
1080}
1081EXPORT_SYMBOL_GPL(tpm_show_timeouts);
1082
6659ca2a
KH		 1083ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
1084 const char *buf, size_t count)
1085{
1086 struct tpm_chip *chip = dev_get_drvdata(dev);
1087 if (chip == NULL)
1088 return 0;
1089
90dda520 1090 chip->vendor.cancel(chip);
6659ca2a
KH		 1091 return count;
1092}
1093EXPORT_SYMBOL_GPL(tpm_store_cancel);
1da177e4 1094
0a418269
PH		 1095static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
1096 bool check_cancel, bool *canceled)
78f09cc2
SB		 1097{
1098 u8 status = chip->vendor.status(chip);
1099
1100 *canceled = false;
1101 if ((status & mask) == mask)
1102 return true;
1103 if (check_cancel && chip->vendor.req_canceled(chip, status)) {
1104 *canceled = true;
1105 return true;
1106 }
1107 return false;
1108}
1109
fd048866 1110int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
78f09cc2 1111 wait_queue_head_t *queue, bool check_cancel)
fd048866
RA		 1112{
1113 unsigned long stop;
1114 long rc;
1115 u8 status;
78f09cc2 1116 bool canceled = false;
fd048866
RA		 1117
1118 /* check current status */
1119 status = chip->vendor.status(chip);
1120 if ((status & mask) == mask)
1121 return 0;
1122
1123 stop = jiffies + timeout;
1124
1125 if (chip->vendor.irq) {
1126again:
1127 timeout = stop - jiffies;
1128 if ((long)timeout <= 0)
1129 return -ETIME;
1130 rc = wait_event_interruptible_timeout(*queue,
78f09cc2
SB		 1131 wait_for_tpm_stat_cond(chip, mask, check_cancel,
1132 &canceled),
1133 timeout);
1134 if (rc > 0) {
1135 if (canceled)
1136 return -ECANCELED;
fd048866 1137 return 0;
78f09cc2 1138 }
fd048866
RA		 1139 if (rc == -ERESTARTSYS && freezing(current)) {
1140 clear_thread_flag(TIF_SIGPENDING);
1141 goto again;
1142 }
1143 } else {
1144 do {
1145 msleep(TPM_TIMEOUT);
1146 status = chip->vendor.status(chip);
1147 if ((status & mask) == mask)
1148 return 0;
1149 } while (time_before(jiffies, stop));
1150 }
1151 return -ETIME;
1152}
1153EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
1da177e4
LT		 1154/*
1155 * Device file system interface to the TPM
f89c5edb
RA		 1156 *
1157 * It's assured that the chip will be opened just once,
1158 * by the check of is_open variable, which is protected
1159 * by driver_lock.
1da177e4
LT		 1160 */
1161int tpm_open(struct inode *inode, struct file *file)
1162{
58c09e21
JG		 1163 struct miscdevice *misc = file->private_data;
1164 struct tpm_chip *chip = container_of(misc, struct tpm_chip,
1165 vendor.miscdev);
1da177e4 1166
dc36d32c 1167 if (test_and_set_bit(0, &chip->is_open)) {
b888c87b 1168 dev_dbg(chip->dev, "Another process owns this TPM\n");
f02a9364 1169 return -EBUSY;
1da177e4
LT		 1170 }
1171
1309d7af 1172 chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
1da177e4 1173 if (chip->data_buffer == NULL) {
dc36d32c 1174 clear_bit(0, &chip->is_open);
1da177e4
LT		 1175 return -ENOMEM;
1176 }
1177
1178 atomic_set(&chip->data_pending, 0);
1179
1180 file->private_data = chip;
58c09e21 1181 get_device(chip->dev);
1da177e4 1182 return 0;
1da177e4 1183}
1da177e4
LT		 1184EXPORT_SYMBOL_GPL(tpm_open);
1185
f02a9364
RA		 1186/*
1187 * Called on file close
1188 */
1da177e4
LT		 1189int tpm_release(struct inode *inode, struct file *file)
1190{
1191 struct tpm_chip *chip = file->private_data;
1da177e4 1192
4bdec11f 1193 del_singleshot_timer_sync(&chip->user_read_timer);
43829731 1194 flush_work(&chip->work);
5e976d55 1195 file->private_data = NULL;
1da177e4 1196 atomic_set(&chip->data_pending, 0);
dd7da132 1197 kzfree(chip->data_buffer);
dc36d32c 1198 clear_bit(0, &chip->is_open);
e659a3fe 1199 put_device(chip->dev);
1da177e4
LT		 1200 return 0;
1201}
1da177e4
LT		 1202EXPORT_SYMBOL_GPL(tpm_release);
1203
b888c87b 1204ssize_t tpm_write(struct file *file, const char __user *buf,
3c2f606a 1205 size_t size, loff_t *off)
1da177e4
LT		 1206{
1207 struct tpm_chip *chip = file->private_data;
abce9ac2
PH		 1208 size_t in_size = size;
1209 ssize_t out_size;
1da177e4
LT		 1210
1211 /* cannot perform a write until the read has cleared
abce9ac2
PH		 1212 either via tpm_read or a user_read_timer timeout.
1213 This also prevents splitted buffered writes from blocking here.
1214 */
1215 if (atomic_read(&chip->data_pending) != 0)
1216 return -EBUSY;
1da177e4
LT		 1217
1218 if (in_size > TPM_BUFSIZE)
abce9ac2
PH		 1219 return -E2BIG;
1220
1221 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 1222
1223 if (copy_from_user
1224 (chip->data_buffer, (void __user *) buf, in_size)) {
d081d470 1225 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1226 return -EFAULT;
1227 }
1228
1229 /* atomic tpm command send and result receive */
1230 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
abce9ac2
PH		 1231 if (out_size < 0) {
1232 mutex_unlock(&chip->buffer_mutex);
1233 return out_size;
1234 }
1da177e4
LT		 1235
1236 atomic_set(&chip->data_pending, out_size);
d081d470 1237 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1238
1239 /* Set a timeout by which the reader must come claim the result */
fe3fd483 1240 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1da177e4
LT		 1241
1242 return in_size;
1243}
1da177e4
LT		 1244EXPORT_SYMBOL_GPL(tpm_write);
1245
3c2f606a
KJH		 1246ssize_t tpm_read(struct file *file, char __user *buf,
1247 size_t size, loff_t *off)
1da177e4
LT		 1248{
1249 struct tpm_chip *chip = file->private_data;
01476001 1250 ssize_t ret_size;
3321c07a 1251 int rc;
1da177e4 1252
5b44bd58 1253 del_singleshot_timer_sync(&chip->user_read_timer);
43829731 1254 flush_work(&chip->work);
5b44bd58 1255 ret_size = atomic_read(&chip->data_pending);
5b44bd58 1256 if (ret_size > 0) { /* relay data */
3ab1aff8 1257 ssize_t orig_ret_size = ret_size;
5b44bd58
KH		 1258 if (size < ret_size)
1259 ret_size = size;
1da177e4 1260
d081d470 1261 mutex_lock(&chip->buffer_mutex);
3321c07a 1262 rc = copy_to_user(buf, chip->data_buffer, ret_size);
3ab1aff8 1263 memset(chip->data_buffer, 0, orig_ret_size);
3321c07a 1264 if (rc)
5b44bd58 1265 ret_size = -EFAULT;
3321c07a 1266
d081d470 1267 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1268 }
1269
dd7da132
KY		 1270 atomic_set(&chip->data_pending, 0);
1271
1da177e4
LT		 1272 return ret_size;
1273}
1da177e4
LT		 1274EXPORT_SYMBOL_GPL(tpm_read);
1275
e659a3fe 1276void tpm_remove_hardware(struct device *dev)
1da177e4 1277{
e659a3fe 1278 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1279
1280 if (chip == NULL) {
e659a3fe 1281 dev_err(dev, "No device data found\n");
1da177e4
LT		 1282 return;
1283 }
1284
1285 spin_lock(&driver_lock);
f02a9364 1286 list_del_rcu(&chip->list);
1da177e4 1287 spin_unlock(&driver_lock);
f02a9364 1288 synchronize_rcu();
1da177e4 1289
90dda520 1290 misc_deregister(&chip->vendor.miscdev);
90dda520 1291 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1631cfb7 1292 tpm_remove_ppi(&dev->kobj);
55a82ab3 1293 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1294
5bd91f18
RM		 1295 /* write it this way to be explicit (chip->dev == dev) */
1296 put_device(chip->dev);
1da177e4 1297}
e659a3fe 1298EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4 1299
225a9be2
RA		 1300#define TPM_ORD_SAVESTATE cpu_to_be32(152)
1301#define SAVESTATE_RESULT_SIZE 10
1302
1303static struct tpm_input_header savestate_header = {
1304 .tag = TPM_TAG_RQU_COMMAND,
1305 .length = cpu_to_be32(10),
1306 .ordinal = TPM_ORD_SAVESTATE
1307};
1308
1da177e4
LT		 1309/*
1310 * We are about to suspend. Save the TPM state
1311 * so that it can be restored.
1312 */
035e2ce8 1313int tpm_pm_suspend(struct device *dev)
1da177e4 1314{
ce2c87d4 1315 struct tpm_chip *chip = dev_get_drvdata(dev);
225a9be2 1316 struct tpm_cmd_t cmd;
32d33b29 1317 int rc, try;
225a9be2
RA		 1318
1319 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
2490c681 1320
1da177e4
LT		 1321 if (chip == NULL)
1322 return -ENODEV;
1323
225a9be2
RA		 1324 /* for buggy tpm, flush pcrs with extend to selected dummy */
1325 if (tpm_suspend_pcr) {
1326 cmd.header.in = pcrextend_header;
1327 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1328 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1329 TPM_DIGEST_SIZE);
1330 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1331 "extending dummy pcr before suspend");
1332 }
1333
1334 /* now do the actual savestate */
32d33b29
DL		 1335 for (try = 0; try < TPM_RETRY; try++) {
1336 cmd.header.in = savestate_header;
1337 rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, NULL);
1338
1339 /*
1340 * If the TPM indicates that it is too busy to respond to
1341 * this command then retry before giving up. It can take
1342 * several seconds for this TPM to be ready.
1343 *
1344 * This can happen if the TPM has already been sent the
1345 * SaveState command before the driver has loaded. TCG 1.2
1346 * specification states that any communication after SaveState
1347 * may cause the TPM to invalidate previously saved state.
1348 */
1349 if (rc != TPM_WARN_RETRY)
1350 break;
1351 msleep(TPM_TIMEOUT_RETRY);
1352 }
1353
1354 if (rc)
1355 dev_err(chip->dev,
1356 "Error (%d) sending savestate before suspend\n", rc);
1357 else if (try > 0)
1358 dev_warn(chip->dev, "TPM savestate took %dms\n",
1359 try * TPM_TIMEOUT_RETRY);
1360
225a9be2 1361 return rc;
1da177e4 1362}
1da177e4
LT		 1363EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1364
1365/*
1366 * Resume from a power safe. The BIOS already restored
1367 * the TPM state.
1368 */
ce2c87d4 1369int tpm_pm_resume(struct device *dev)
1da177e4 1370{
ce2c87d4 1371 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1372
1373 if (chip == NULL)
1374 return -ENODEV;
1375
1da177e4
LT		 1376 return 0;
1377}
1da177e4
LT		 1378EXPORT_SYMBOL_GPL(tpm_pm_resume);
1379
41ab999c
KY		 1380#define TPM_GETRANDOM_RESULT_SIZE 18
1381static struct tpm_input_header tpm_getrandom_header = {
1382 .tag = TPM_TAG_RQU_COMMAND,
1383 .length = cpu_to_be32(14),
1384 .ordinal = TPM_ORD_GET_RANDOM
1385};
1386
1387/**
1388 * tpm_get_random() - Get random bytes from the tpm's RNG
1389 * @chip_num: A specific chip number for the request or TPM_ANY_NUM
1390 * @out: destination buffer for the random bytes
1391 * @max: the max number of bytes to write to @out
1392 *
1393 * Returns < 0 on error and the number of bytes read on success
1394 */
1395int tpm_get_random(u32 chip_num, u8 *out, size_t max)
1396{
1397 struct tpm_chip *chip;
1398 struct tpm_cmd_t tpm_cmd;
1399 u32 recd, num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA);
1400 int err, total = 0, retries = 5;
1401 u8 *dest = out;
1402
1403 chip = tpm_chip_find_get(chip_num);
1404 if (chip == NULL)
1405 return -ENODEV;
1406
1407 if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
1408 return -EINVAL;
1409
1410 do {
1411 tpm_cmd.header.in = tpm_getrandom_header;
1412 tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
1413
1414 err = transmit_cmd(chip, &tpm_cmd,
1415 TPM_GETRANDOM_RESULT_SIZE + num_bytes,
1416 "attempting get random");
1417 if (err)
1418 break;
1419
1420 recd = be32_to_cpu(tpm_cmd.params.getrandom_out.rng_data_len);
1421 memcpy(dest, tpm_cmd.params.getrandom_out.rng_data, recd);
1422
1423 dest += recd;
1424 total += recd;
1425 num_bytes -= recd;
1426 } while (retries-- && total < max);
1427
1428 return total ? total : -EIO;
1429}
1430EXPORT_SYMBOL_GPL(tpm_get_random);
1431
253115b7
RA		 1432/* In case vendor provided release function, call it too.*/
1433
1434void tpm_dev_vendor_release(struct tpm_chip *chip)
1435{
3072928f
AS		 1436 if (!chip)
1437 return;
1438
253115b7
RA		 1439 if (chip->vendor.release)
1440 chip->vendor.release(chip->dev);
1441
1442 clear_bit(chip->dev_num, dev_mask);
253115b7
RA		 1443}
1444EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1445
1446
5bd91f18
RM		 1447/*
1448 * Once all references to platform device are down to 0,
1449 * release all allocated structures.
5bd91f18 1450 */
e2fa3d79 1451void tpm_dev_release(struct device *dev)
5bd91f18
RM		 1452{
1453 struct tpm_chip *chip = dev_get_drvdata(dev);
1454
3072928f
AS		 1455 if (!chip)
1456 return;
1457
253115b7 1458 tpm_dev_vendor_release(chip);
5bd91f18 1459
253115b7 1460 chip->release(dev);
5bd91f18
RM		 1461 kfree(chip);
1462}
253115b7 1463EXPORT_SYMBOL_GPL(tpm_dev_release);
5bd91f18 1464
1da177e4 1465/*
0a418269 1466 * Called from tpm_<specific>.c probe function only for devices
1da177e4
LT		 1467 * the driver has determined it should claim. Prior to calling
1468 * this function the specific probe function has called pci_enable_device
1469 * upon errant exit from this function specific probe function should call
1470 * pci_disable_device
1471 */
f02a9364
RA		 1472struct tpm_chip *tpm_register_hardware(struct device *dev,
1473 const struct tpm_vendor_specific *entry)
1da177e4 1474{
1da177e4 1475 struct tpm_chip *chip;
1da177e4
LT		 1476
1477 /* Driver specific per-device data */
b888c87b 1478 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
8e39c933 1479
6aff1fdc
JG		 1480 if (chip == NULL)
1481 return NULL;
1da177e4 1482
d081d470
MK		 1483 mutex_init(&chip->buffer_mutex);
1484 mutex_init(&chip->tpm_mutex);
1da177e4
LT		 1485 INIT_LIST_HEAD(&chip->list);
1486
c4028958 1487 INIT_WORK(&chip->work, timeout_work);
09e12f9f 1488
40565f19
JS		 1489 setup_timer(&chip->user_read_timer, user_reader_timeout,
1490 (unsigned long)chip);
fe3fd483 1491
90dda520 1492 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4 1493
10685a95 1494 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1da177e4 1495
10685a95 1496 if (chip->dev_num >= TPM_NUM_DEVICES) {
b888c87b 1497 dev_err(dev, "No available tpm device numbers\n");
dd78c943 1498 goto out_free;
1da177e4 1499 } else if (chip->dev_num == 0)
90dda520 1500 chip->vendor.miscdev.minor = TPM_MINOR;
1da177e4 1501 else
90dda520 1502 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1da177e4 1503
10685a95
KJH		 1504 set_bit(chip->dev_num, dev_mask);
1505
6aff1fdc
JG		 1506 scnprintf(chip->devname, sizeof(chip->devname), "%s%d", "tpm",
1507 chip->dev_num);
1508 chip->vendor.miscdev.name = chip->devname;
1da177e4 1509
94fbcded 1510 chip->vendor.miscdev.parent = dev;
e659a3fe 1511 chip->dev = get_device(dev);
5bd91f18
RM		 1512 chip->release = dev->release;
1513 dev->release = tpm_dev_release;
1514 dev_set_drvdata(dev, chip);
1da177e4 1515
90dda520 1516 if (misc_register(&chip->vendor.miscdev)) {
e659a3fe 1517 dev_err(chip->dev,
1da177e4 1518 "unable to misc_register %s, minor %d\n",
90dda520
KJH		 1519 chip->vendor.miscdev.name,
1520 chip->vendor.miscdev.minor);
dad79cb8 1521 goto put_device;
1da177e4
LT		 1522 }
1523
f33d9bd5 1524 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
5d469ec0 1525 misc_deregister(&chip->vendor.miscdev);
dad79cb8 1526 goto put_device;
f33d9bd5 1527 }
1da177e4 1528
1631cfb7 1529 if (tpm_add_ppi(&dev->kobj)) {
f84fdff0
XZ		 1530 misc_deregister(&chip->vendor.miscdev);
1531 goto put_device;
1532 }
1533
6aff1fdc 1534 chip->bios_dir = tpm_bios_log_setup(chip->devname);
55a82ab3 1535
f02a9364
RA		 1536 /* Make chip available */
1537 spin_lock(&driver_lock);
1538 list_add_rcu(&chip->list, &tpm_chip_list);
1539 spin_unlock(&driver_lock);
1540
e0dd03ca 1541 return chip;
dd78c943 1542
dad79cb8
WG		 1543put_device:
1544 put_device(chip->dev);
dd78c943
AM		 1545out_free:
1546 kfree(chip);
dd78c943 1547 return NULL;
1da177e4 1548}
1da177e4
LT		 1549EXPORT_SYMBOL_GPL(tpm_register_hardware);
1550
1da177e4
LT		 1551MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1552MODULE_DESCRIPTION("TPM Driver");
1553MODULE_VERSION("2.0");
1554MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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