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tpm: Cleanup tpm_continue_selftest
[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
2b30a90f 530int tpm_get_timeouts(struct tpm_chip *chip)
08e96e48 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;
e3e1a1e1 537 unsigned int scale = 1;
08e96e48 538
08837438
RA		 539 tpm_cmd.header.in = tpm_getcap_header;
540 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
541 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
542 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 543
08837438 544 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 545 "attempting to determine the timeouts");
546 if (rc)
547 goto duration;
548
829bf067
SB		 549 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
550 be32_to_cpu(tpm_cmd.header.out.length)
551 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
2b30a90f 552 return -EINVAL;
08e96e48 553
08837438 554 timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
08e96e48 555 /* Don't overwrite default if value is 0 */
08837438 556 timeout = be32_to_cpu(timeout_cap->a);
e3e1a1e1
SB		 557 if (timeout && timeout < 1000) {
558 /* timeouts in msec rather usec */
559 scale = 1000;
62592101 560 chip->vendor.timeout_adjusted = true;
e3e1a1e1 561 }
08e96e48 562 if (timeout)
e3e1a1e1 563 chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
08837438 564 timeout = be32_to_cpu(timeout_cap->b);
08e96e48 565 if (timeout)
e3e1a1e1 566 chip->vendor.timeout_b = usecs_to_jiffies(timeout * scale);
08837438 567 timeout = be32_to_cpu(timeout_cap->c);
08e96e48 568 if (timeout)
e3e1a1e1 569 chip->vendor.timeout_c = usecs_to_jiffies(timeout * scale);
08837438 570 timeout = be32_to_cpu(timeout_cap->d);
08e96e48 571 if (timeout)
e3e1a1e1 572 chip->vendor.timeout_d = usecs_to_jiffies(timeout * scale);
08e96e48
KJH		 573
574duration:
08837438
RA		 575 tpm_cmd.header.in = tpm_getcap_header;
576 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
577 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
578 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
08e96e48 579
08837438 580 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 581 "attempting to determine the durations");
582 if (rc)
2b30a90f 583 return rc;
08e96e48 584
979b1406
SB		 585 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
586 be32_to_cpu(tpm_cmd.header.out.length)
587 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
2b30a90f 588 return -EINVAL;
979b1406 589
08837438 590 duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
08e96e48 591 chip->vendor.duration[TPM_SHORT] =
08837438 592 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
e934acca
SB		 593 chip->vendor.duration[TPM_MEDIUM] =
594 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
595 chip->vendor.duration[TPM_LONG] =
596 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
597
292cf4a8
VK		 598 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
599 * value wrong and apparently reports msecs rather than usecs. So we
600 * fix up the resulting too-small TPM_SHORT value to make things work.
e934acca 601 * We also scale the TPM_MEDIUM and -_LONG values by 1000.
292cf4a8 602 */
e934acca 603 if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
292cf4a8 604 chip->vendor.duration[TPM_SHORT] = HZ;
e934acca
SB		 605 chip->vendor.duration[TPM_MEDIUM] *= 1000;
606 chip->vendor.duration[TPM_LONG] *= 1000;
04ab2293 607 chip->vendor.duration_adjusted = true;
e934acca
SB		 608 dev_info(chip->dev, "Adjusting TPM timeout parameters.");
609 }
2b30a90f 610 return 0;
08e96e48
KJH		 611}
612EXPORT_SYMBOL_GPL(tpm_get_timeouts);
613
d97c6ade
SB		 614#define TPM_ORD_CONTINUE_SELFTEST 83
615#define CONTINUE_SELFTEST_RESULT_SIZE 10
616
617static struct tpm_input_header continue_selftest_header = {
618 .tag = TPM_TAG_RQU_COMMAND,
619 .length = cpu_to_be32(10),
620 .ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
621};
622
623/**
624 * tpm_continue_selftest -- run TPM's selftest
625 * @chip: TPM chip to use
626 *
627 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
628 * a TPM error code.
629 */
630int tpm_continue_selftest(struct tpm_chip *chip)
08e96e48 631{
d97c6ade
SB		 632 int rc;
633 struct tpm_cmd_t cmd;
08e96e48 634
d97c6ade
SB		 635 cmd.header.in = continue_selftest_header;
636 rc = transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
637 "continue selftest");
638 return rc;
08e96e48
KJH		 639}
640EXPORT_SYMBOL_GPL(tpm_continue_selftest);
641
642ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
643 char *buf)
644{
08837438 645 cap_t cap;
08e96e48
KJH		 646 ssize_t rc;
647
08837438
RA		 648 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
649 "attempting to determine the permanent enabled state");
650 if (rc)
08e96e48 651 return 0;
ec288bd3 652
08837438 653 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
ec288bd3 654 return rc;
08e96e48
KJH		 655}
656EXPORT_SYMBOL_GPL(tpm_show_enabled);
657
658ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
659 char *buf)
660{
08837438 661 cap_t cap;
08e96e48
KJH		 662 ssize_t rc;
663
08837438
RA		 664 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
665 "attempting to determine the permanent active state");
666 if (rc)
08e96e48 667 return 0;
ec288bd3 668
08837438 669 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
ec288bd3 670 return rc;
08e96e48
KJH		 671}
672EXPORT_SYMBOL_GPL(tpm_show_active);
673
674ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
675 char *buf)
676{
08837438 677 cap_t cap;
08e96e48
KJH		 678 ssize_t rc;
679
08837438
RA		 680 rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
681 "attempting to determine the owner state");
682 if (rc)
08e96e48 683 return 0;
ec288bd3 684
08837438 685 rc = sprintf(buf, "%d\n", cap.owned);
ec288bd3 686 return rc;
08e96e48
KJH		 687}
688EXPORT_SYMBOL_GPL(tpm_show_owned);
689
690ssize_t tpm_show_temp_deactivated(struct device * dev,
691 struct device_attribute * attr, char *buf)
692{
08837438 693 cap_t cap;
08e96e48
KJH		 694 ssize_t rc;
695
08837438
RA		 696 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
697 "attempting to determine the temporary state");
698 if (rc)
08e96e48 699 return 0;
ec288bd3 700
08837438 701 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
ec288bd3 702 return rc;
08e96e48
KJH		 703}
704EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
705
659aaf2b
RA		 706/*
707 * tpm_chip_find_get - return tpm_chip for given chip number
708 */
709static struct tpm_chip *tpm_chip_find_get(int chip_num)
710{
8920d5ad 711 struct tpm_chip *pos, *chip = NULL;
659aaf2b
RA		 712
713 rcu_read_lock();
714 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
715 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
716 continue;
717
8920d5ad
RA		 718 if (try_module_get(pos->dev->driver->owner)) {
719 chip = pos;
659aaf2b 720 break;
8920d5ad 721 }
659aaf2b
RA		 722 }
723 rcu_read_unlock();
8920d5ad 724 return chip;
659aaf2b
RA		 725}
726
727#define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
728#define READ_PCR_RESULT_SIZE 30
729static struct tpm_input_header pcrread_header = {
730 .tag = TPM_TAG_RQU_COMMAND,
731 .length = cpu_to_be32(14),
732 .ordinal = TPM_ORDINAL_PCRREAD
1da177e4
LT		 733};
734
659aaf2b
RA		 735int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
736{
737 int rc;
738 struct tpm_cmd_t cmd;
739
740 cmd.header.in = pcrread_header;
741 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
23acb98d 742 rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
659aaf2b
RA		 743 "attempting to read a pcr value");
744
745 if (rc == 0)
746 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
747 TPM_DIGEST_SIZE);
748 return rc;
749}
750
751/**
752 * tpm_pcr_read - read a pcr value
753 * @chip_num: tpm idx # or ANY
754 * @pcr_idx: pcr idx to retrieve
755 * @res_buf: TPM_PCR value
756 * size of res_buf is 20 bytes (or NULL if you don't care)
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 */
762int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
763{
764 struct tpm_chip *chip;
765 int rc;
766
767 chip = tpm_chip_find_get(chip_num);
768 if (chip == NULL)
769 return -ENODEV;
770 rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
a0e39349 771 tpm_chip_put(chip);
659aaf2b
RA		 772 return rc;
773}
774EXPORT_SYMBOL_GPL(tpm_pcr_read);
775
776/**
777 * tpm_pcr_extend - extend pcr value with hash
778 * @chip_num: tpm idx # or AN&
779 * @pcr_idx: pcr idx to extend
780 * @hash: hash value used to extend pcr value
781 *
782 * The TPM driver should be built-in, but for whatever reason it
783 * isn't, protect against the chip disappearing, by incrementing
784 * the module usage count.
785 */
786#define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
0afd9056 787#define EXTEND_PCR_RESULT_SIZE 34
659aaf2b
RA		 788static struct tpm_input_header pcrextend_header = {
789 .tag = TPM_TAG_RQU_COMMAND,
790 .length = cpu_to_be32(34),
791 .ordinal = TPM_ORD_PCR_EXTEND
792};
793
794int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
795{
796 struct tpm_cmd_t cmd;
797 int rc;
798 struct tpm_chip *chip;
799
800 chip = tpm_chip_find_get(chip_num);
801 if (chip == NULL)
802 return -ENODEV;
803
804 cmd.header.in = pcrextend_header;
659aaf2b
RA		 805 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
806 memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
0afd9056 807 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
659aaf2b
RA		 808 "attempting extend a PCR value");
809
a0e39349 810 tpm_chip_put(chip);
659aaf2b
RA		 811 return rc;
812}
813EXPORT_SYMBOL_GPL(tpm_pcr_extend);
814
c749ba91
MZ		 815int tpm_send(u32 chip_num, void *cmd, size_t buflen)
816{
817 struct tpm_chip *chip;
818 int rc;
819
820 chip = tpm_chip_find_get(chip_num);
821 if (chip == NULL)
822 return -ENODEV;
823
824 rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
825
826 tpm_chip_put(chip);
827 return rc;
828}
829EXPORT_SYMBOL_GPL(tpm_send);
830
6659ca2a
KH		 831ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
832 char *buf)
1da177e4 833{
08837438 834 cap_t cap;
659aaf2b 835 u8 digest[TPM_DIGEST_SIZE];
beed53a1 836 ssize_t rc;
81179bb6 837 int i, j, num_pcrs;
1da177e4 838 char *str = buf;
e659a3fe 839 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 840
08837438 841 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
beed53a1 842 "attempting to determine the number of PCRS");
08837438 843 if (rc)
e234bc97 844 return 0;
1da177e4 845
08837438 846 num_pcrs = be32_to_cpu(cap.num_pcrs);
1da177e4 847 for (i = 0; i < num_pcrs; i++) {
659aaf2b 848 rc = __tpm_pcr_read(chip, i, digest);
beed53a1 849 if (rc)
08837438 850 break;
1da177e4
LT		 851 str += sprintf(str, "PCR-%02d: ", i);
852 for (j = 0; j < TPM_DIGEST_SIZE; j++)
659aaf2b 853 str += sprintf(str, "%02X ", digest[j]);
1da177e4
LT		 854 str += sprintf(str, "\n");
855 }
856 return str - buf;
857}
6659ca2a 858EXPORT_SYMBOL_GPL(tpm_show_pcrs);
1da177e4
LT		 859
860#define READ_PUBEK_RESULT_SIZE 314
08837438
RA		 861#define TPM_ORD_READPUBEK cpu_to_be32(124)
862struct tpm_input_header tpm_readpubek_header = {
863 .tag = TPM_TAG_RQU_COMMAND,
864 .length = cpu_to_be32(30),
865 .ordinal = TPM_ORD_READPUBEK
1da177e4
LT		 866};
867
6659ca2a
KH		 868ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
869 char *buf)
1da177e4 870{
2df7111f 871 u8 *data;
08837438 872 struct tpm_cmd_t tpm_cmd;
beed53a1 873 ssize_t err;
81179bb6 874 int i, rc;
1da177e4
LT		 875 char *str = buf;
876
e659a3fe 877 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 878
08837438
RA		 879 tpm_cmd.header.in = tpm_readpubek_header;
880 err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
beed53a1
KJH		 881 "attempting to read the PUBEK");
882 if (err)
34d6e075 883 goto out;
1da177e4
LT		 884
885 /*
886 ignore header 10 bytes
887 algorithm 32 bits (1 == RSA )
888 encscheme 16 bits
889 sigscheme 16 bits
890 parameters (RSA 12->bytes: keybit, #primes, expbit)
891 keylenbytes 32 bits
892 256 byte modulus
893 ignore checksum 20 bytes
894 */
08837438 895 data = tpm_cmd.params.readpubek_out_buffer;
1da177e4
LT		 896 str +=
897 sprintf(str,
5a79444f
SB		 898 "Algorithm: %02X %02X %02X %02X\n"
899 "Encscheme: %02X %02X\n"
900 "Sigscheme: %02X %02X\n"
901 "Parameters: %02X %02X %02X %02X "
902 "%02X %02X %02X %02X "
903 "%02X %02X %02X %02X\n"
904 "Modulus length: %d\n"
905 "Modulus:\n",
906 data[0], data[1], data[2], data[3],
907 data[4], data[5],
908 data[6], data[7],
909 data[12], data[13], data[14], data[15],
910 data[16], data[17], data[18], data[19],
911 data[20], data[21], data[22], data[23],
912 be32_to_cpu(*((__be32 *) (data + 24))));
1da177e4
LT		 913
914 for (i = 0; i < 256; i++) {
5a79444f 915 str += sprintf(str, "%02X ", data[i + 28]);
1da177e4
LT		 916 if ((i + 1) % 16 == 0)
917 str += sprintf(str, "\n");
918 }
34d6e075 919out:
beed53a1 920 rc = str - buf;
2df7111f 921 return rc;
1da177e4 922}
6659ca2a 923EXPORT_SYMBOL_GPL(tpm_show_pubek);
1da177e4 924
1da177e4 925
6659ca2a
KH		 926ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
927 char *buf)
1da177e4 928{
08837438 929 cap_t cap;
beed53a1 930 ssize_t rc;
1da177e4
LT		 931 char *str = buf;
932
08837438 933 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
beed53a1 934 "attempting to determine the manufacturer");
08837438 935 if (rc)
beed53a1 936 return 0;
1da177e4 937 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438 938 be32_to_cpu(cap.manufacturer_id));
1da177e4 939
08837438
RA		 940 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
941 "attempting to determine the 1.1 version");
beed53a1 942 if (rc)
08837438 943 return 0;
beed53a1
KJH		 944 str += sprintf(str,
945 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 946 cap.tpm_version.Major, cap.tpm_version.Minor,
947 cap.tpm_version.revMajor, cap.tpm_version.revMinor);
1da177e4
LT		 948 return str - buf;
949}
6659ca2a
KH		 950EXPORT_SYMBOL_GPL(tpm_show_caps);
951
08e96e48
KJH		 952ssize_t tpm_show_caps_1_2(struct device * dev,
953 struct device_attribute * attr, char *buf)
954{
08837438
RA		 955 cap_t cap;
956 ssize_t rc;
08e96e48
KJH		 957 char *str = buf;
958
08837438
RA		 959 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
960 "attempting to determine the manufacturer");
961 if (rc)
08e96e48 962 return 0;
08e96e48 963 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438
RA		 964 be32_to_cpu(cap.manufacturer_id));
965 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
966 "attempting to determine the 1.2 version");
967 if (rc)
968 return 0;
08e96e48
KJH		 969 str += sprintf(str,
970 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 971 cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
972 cap.tpm_version_1_2.revMajor,
973 cap.tpm_version_1_2.revMinor);
08e96e48
KJH		 974 return str - buf;
975}
976EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
977
04ab2293
SB		 978ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
979 char *buf)
980{
981 struct tpm_chip *chip = dev_get_drvdata(dev);
982
403d1d03
SB		 983 if (chip->vendor.duration[TPM_LONG] == 0)
984 return 0;
985
04ab2293
SB		 986 return sprintf(buf, "%d %d %d [%s]\n",
987 jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
988 jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
989 jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
990 chip->vendor.duration_adjusted
991 ? "adjusted" : "original");
992}
993EXPORT_SYMBOL_GPL(tpm_show_durations);
994
62592101
SB		 995ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
996 char *buf)
997{
998 struct tpm_chip *chip = dev_get_drvdata(dev);
999
1000 return sprintf(buf, "%d %d %d %d [%s]\n",
1001 jiffies_to_usecs(chip->vendor.timeout_a),
1002 jiffies_to_usecs(chip->vendor.timeout_b),
1003 jiffies_to_usecs(chip->vendor.timeout_c),
1004 jiffies_to_usecs(chip->vendor.timeout_d),
1005 chip->vendor.timeout_adjusted
1006 ? "adjusted" : "original");
1007}
1008EXPORT_SYMBOL_GPL(tpm_show_timeouts);
1009
6659ca2a
KH		 1010ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
1011 const char *buf, size_t count)
1012{
1013 struct tpm_chip *chip = dev_get_drvdata(dev);
1014 if (chip == NULL)
1015 return 0;
1016
90dda520 1017 chip->vendor.cancel(chip);
6659ca2a
KH		 1018 return count;
1019}
1020EXPORT_SYMBOL_GPL(tpm_store_cancel);
1da177e4 1021
1da177e4
LT		 1022/*
1023 * Device file system interface to the TPM
f89c5edb
RA		 1024 *
1025 * It's assured that the chip will be opened just once,
1026 * by the check of is_open variable, which is protected
1027 * by driver_lock.
1da177e4
LT		 1028 */
1029int tpm_open(struct inode *inode, struct file *file)
1030{
f02a9364 1031 int minor = iminor(inode);
1da177e4
LT		 1032 struct tpm_chip *chip = NULL, *pos;
1033
f02a9364
RA		 1034 rcu_read_lock();
1035 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
90dda520 1036 if (pos->vendor.miscdev.minor == minor) {
1da177e4 1037 chip = pos;
f02a9364 1038 get_device(chip->dev);
1da177e4
LT		 1039 break;
1040 }
1041 }
f02a9364 1042 rcu_read_unlock();
1da177e4 1043
f02a9364
RA		 1044 if (!chip)
1045 return -ENODEV;
1da177e4 1046
dc36d32c 1047 if (test_and_set_bit(0, &chip->is_open)) {
b888c87b 1048 dev_dbg(chip->dev, "Another process owns this TPM\n");
f02a9364
RA		 1049 put_device(chip->dev);
1050 return -EBUSY;
1da177e4
LT		 1051 }
1052
1309d7af 1053 chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
1da177e4 1054 if (chip->data_buffer == NULL) {
dc36d32c 1055 clear_bit(0, &chip->is_open);
e659a3fe 1056 put_device(chip->dev);
1da177e4
LT		 1057 return -ENOMEM;
1058 }
1059
1060 atomic_set(&chip->data_pending, 0);
1061
1062 file->private_data = chip;
1063 return 0;
1da177e4 1064}
1da177e4
LT		 1065EXPORT_SYMBOL_GPL(tpm_open);
1066
f02a9364
RA		 1067/*
1068 * Called on file close
1069 */
1da177e4
LT		 1070int tpm_release(struct inode *inode, struct file *file)
1071{
1072 struct tpm_chip *chip = file->private_data;
1da177e4 1073
4bdec11f 1074 del_singleshot_timer_sync(&chip->user_read_timer);
2e5c44c9 1075 flush_work_sync(&chip->work);
5e976d55 1076 file->private_data = NULL;
1da177e4 1077 atomic_set(&chip->data_pending, 0);
f02a9364 1078 kfree(chip->data_buffer);
dc36d32c 1079 clear_bit(0, &chip->is_open);
e659a3fe 1080 put_device(chip->dev);
1da177e4
LT		 1081 return 0;
1082}
1da177e4
LT		 1083EXPORT_SYMBOL_GPL(tpm_release);
1084
b888c87b 1085ssize_t tpm_write(struct file *file, const char __user *buf,
3c2f606a 1086 size_t size, loff_t *off)
1da177e4
LT		 1087{
1088 struct tpm_chip *chip = file->private_data;
01476001 1089 size_t in_size = size, out_size;
1da177e4
LT		 1090
1091 /* cannot perform a write until the read has cleared
1092 either via tpm_read or a user_read_timer timeout */
700d8bdc
NA		 1093 while (atomic_read(&chip->data_pending) != 0)
1094 msleep(TPM_TIMEOUT);
1da177e4 1095
d081d470 1096 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 1097
1098 if (in_size > TPM_BUFSIZE)
1099 in_size = TPM_BUFSIZE;
1100
1101 if (copy_from_user
1102 (chip->data_buffer, (void __user *) buf, in_size)) {
d081d470 1103 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1104 return -EFAULT;
1105 }
1106
1107 /* atomic tpm command send and result receive */
1108 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1109
1110 atomic_set(&chip->data_pending, out_size);
d081d470 1111 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1112
1113 /* Set a timeout by which the reader must come claim the result */
fe3fd483 1114 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1da177e4
LT		 1115
1116 return in_size;
1117}
1da177e4
LT		 1118EXPORT_SYMBOL_GPL(tpm_write);
1119
3c2f606a
KJH		 1120ssize_t tpm_read(struct file *file, char __user *buf,
1121 size_t size, loff_t *off)
1da177e4
LT		 1122{
1123 struct tpm_chip *chip = file->private_data;
01476001 1124 ssize_t ret_size;
1da177e4 1125
5b44bd58 1126 del_singleshot_timer_sync(&chip->user_read_timer);
2e5c44c9 1127 flush_work_sync(&chip->work);
5b44bd58
KH		 1128 ret_size = atomic_read(&chip->data_pending);
1129 atomic_set(&chip->data_pending, 0);
1130 if (ret_size > 0) { /* relay data */
1131 if (size < ret_size)
1132 ret_size = size;
1da177e4 1133
d081d470 1134 mutex_lock(&chip->buffer_mutex);
f6a2382c 1135 if (copy_to_user(buf, chip->data_buffer, ret_size))
5b44bd58 1136 ret_size = -EFAULT;
d081d470 1137 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1138 }
1139
1140 return ret_size;
1141}
1da177e4
LT		 1142EXPORT_SYMBOL_GPL(tpm_read);
1143
e659a3fe 1144void tpm_remove_hardware(struct device *dev)
1da177e4 1145{
e659a3fe 1146 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1147
1148 if (chip == NULL) {
e659a3fe 1149 dev_err(dev, "No device data found\n");
1da177e4
LT		 1150 return;
1151 }
1152
1153 spin_lock(&driver_lock);
f02a9364 1154 list_del_rcu(&chip->list);
1da177e4 1155 spin_unlock(&driver_lock);
f02a9364 1156 synchronize_rcu();
1da177e4 1157
90dda520 1158 misc_deregister(&chip->vendor.miscdev);
90dda520 1159 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
55a82ab3 1160 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1161
5bd91f18
RM		 1162 /* write it this way to be explicit (chip->dev == dev) */
1163 put_device(chip->dev);
1da177e4 1164}
e659a3fe 1165EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4 1166
225a9be2
RA		 1167#define TPM_ORD_SAVESTATE cpu_to_be32(152)
1168#define SAVESTATE_RESULT_SIZE 10
1169
1170static struct tpm_input_header savestate_header = {
1171 .tag = TPM_TAG_RQU_COMMAND,
1172 .length = cpu_to_be32(10),
1173 .ordinal = TPM_ORD_SAVESTATE
1174};
1175
1da177e4
LT		 1176/*
1177 * We are about to suspend. Save the TPM state
1178 * so that it can be restored.
1179 */
ce2c87d4 1180int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1da177e4 1181{
ce2c87d4 1182 struct tpm_chip *chip = dev_get_drvdata(dev);
225a9be2
RA		 1183 struct tpm_cmd_t cmd;
1184 int rc;
1185
1186 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
2490c681 1187
1da177e4
LT		 1188 if (chip == NULL)
1189 return -ENODEV;
1190
225a9be2
RA		 1191 /* for buggy tpm, flush pcrs with extend to selected dummy */
1192 if (tpm_suspend_pcr) {
1193 cmd.header.in = pcrextend_header;
1194 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1195 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1196 TPM_DIGEST_SIZE);
1197 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1198 "extending dummy pcr before suspend");
1199 }
1200
1201 /* now do the actual savestate */
1202 cmd.header.in = savestate_header;
1203 rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
1204 "sending savestate before suspend");
1205 return rc;
1da177e4 1206}
1da177e4
LT		 1207EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1208
1209/*
1210 * Resume from a power safe. The BIOS already restored
1211 * the TPM state.
1212 */
ce2c87d4 1213int tpm_pm_resume(struct device *dev)
1da177e4 1214{
ce2c87d4 1215 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1216
1217 if (chip == NULL)
1218 return -ENODEV;
1219
1da177e4
LT		 1220 return 0;
1221}
1da177e4
LT		 1222EXPORT_SYMBOL_GPL(tpm_pm_resume);
1223
253115b7
RA		 1224/* In case vendor provided release function, call it too.*/
1225
1226void tpm_dev_vendor_release(struct tpm_chip *chip)
1227{
1228 if (chip->vendor.release)
1229 chip->vendor.release(chip->dev);
1230
1231 clear_bit(chip->dev_num, dev_mask);
1232 kfree(chip->vendor.miscdev.name);
1233}
1234EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1235
1236
5bd91f18
RM		 1237/*
1238 * Once all references to platform device are down to 0,
1239 * release all allocated structures.
5bd91f18 1240 */
cbb2ed4a 1241void tpm_dev_release(struct device *dev)
5bd91f18
RM		 1242{
1243 struct tpm_chip *chip = dev_get_drvdata(dev);
1244
253115b7 1245 tpm_dev_vendor_release(chip);
5bd91f18 1246
253115b7 1247 chip->release(dev);
5bd91f18
RM		 1248 kfree(chip);
1249}
253115b7 1250EXPORT_SYMBOL_GPL(tpm_dev_release);
5bd91f18 1251
1da177e4
LT		 1252/*
1253 * Called from tpm_<specific>.c probe function only for devices
1254 * the driver has determined it should claim. Prior to calling
1255 * this function the specific probe function has called pci_enable_device
1256 * upon errant exit from this function specific probe function should call
1257 * pci_disable_device
1258 */
f02a9364
RA		 1259struct tpm_chip *tpm_register_hardware(struct device *dev,
1260 const struct tpm_vendor_specific *entry)
1da177e4 1261{
6f9beccb
KJH		 1262#define DEVNAME_SIZE 7
1263
1264 char *devname;
1da177e4 1265 struct tpm_chip *chip;
1da177e4
LT		 1266
1267 /* Driver specific per-device data */
b888c87b 1268 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
8e39c933
PW		 1269 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1270
dd78c943
AM		 1271 if (chip == NULL || devname == NULL)
1272 goto out_free;
1da177e4 1273
d081d470
MK		 1274 mutex_init(&chip->buffer_mutex);
1275 mutex_init(&chip->tpm_mutex);
1da177e4
LT		 1276 INIT_LIST_HEAD(&chip->list);
1277
c4028958 1278 INIT_WORK(&chip->work, timeout_work);
09e12f9f 1279
40565f19
JS		 1280 setup_timer(&chip->user_read_timer, user_reader_timeout,
1281 (unsigned long)chip);
fe3fd483 1282
90dda520 1283 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4 1284
10685a95 1285 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1da177e4 1286
10685a95 1287 if (chip->dev_num >= TPM_NUM_DEVICES) {
b888c87b 1288 dev_err(dev, "No available tpm device numbers\n");
dd78c943 1289 goto out_free;
1da177e4 1290 } else if (chip->dev_num == 0)
90dda520 1291 chip->vendor.miscdev.minor = TPM_MINOR;
1da177e4 1292 else
90dda520 1293 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1da177e4 1294
10685a95
KJH		 1295 set_bit(chip->dev_num, dev_mask);
1296
6f9beccb 1297 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
90dda520 1298 chip->vendor.miscdev.name = devname;
1da177e4 1299
94fbcded 1300 chip->vendor.miscdev.parent = dev;
e659a3fe 1301 chip->dev = get_device(dev);
5bd91f18
RM		 1302 chip->release = dev->release;
1303 dev->release = tpm_dev_release;
1304 dev_set_drvdata(dev, chip);
1da177e4 1305
90dda520 1306 if (misc_register(&chip->vendor.miscdev)) {
e659a3fe 1307 dev_err(chip->dev,
1da177e4 1308 "unable to misc_register %s, minor %d\n",
90dda520
KJH		 1309 chip->vendor.miscdev.name,
1310 chip->vendor.miscdev.minor);
5bd91f18 1311 put_device(chip->dev);
e0dd03ca 1312 return NULL;
1da177e4
LT		 1313 }
1314
f33d9bd5 1315 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
5d469ec0 1316 misc_deregister(&chip->vendor.miscdev);
5bd91f18 1317 put_device(chip->dev);
f02a9364 1318
f33d9bd5
JG		 1319 return NULL;
1320 }
1da177e4 1321
55a82ab3
KJH		 1322 chip->bios_dir = tpm_bios_log_setup(devname);
1323
f02a9364
RA		 1324 /* Make chip available */
1325 spin_lock(&driver_lock);
1326 list_add_rcu(&chip->list, &tpm_chip_list);
1327 spin_unlock(&driver_lock);
1328
e0dd03ca 1329 return chip;
dd78c943
AM		 1330
1331out_free:
1332 kfree(chip);
1333 kfree(devname);
1334 return NULL;
1da177e4 1335}
1da177e4
LT		 1336EXPORT_SYMBOL_GPL(tpm_register_hardware);
1337
1da177e4
LT		 1338MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1339MODULE_DESCRIPTION("TPM Driver");
1340MODULE_VERSION("2.0");
1341MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)