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[linux.git] / drivers / char / tpm / tpm.c
CommitLineData
1da177e4
LT		 1/*
2 * Copyright (C) 2004 IBM Corporation
3 *
4 * Authors:
5 * Leendert van Doorn <[email protected]>
6 * Dave Safford <[email protected]>
7 * Reiner Sailer <[email protected]>
8 * Kylene Hall <[email protected]>
9 *
8e81cc13 10 * Maintained by: <[email protected]>
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>
fd048866 30#include <linux/freezer.h>
d081d470 31
1da177e4
LT		 32#include "tpm.h"
33
3122a88a
KH		 34enum tpm_const {
35 TPM_MINOR = 224, /* officially assigned */
7f366784 36 TPM_BUFSIZE = 4096,
3122a88a 37 TPM_NUM_DEVICES = 256,
3122a88a 38};
1da177e4 39
9e18ee19
KJH		 40enum tpm_duration {
41 TPM_SHORT = 0,
42 TPM_MEDIUM = 1,
43 TPM_LONG = 2,
44 TPM_UNDEFINED,
45};
46
47#define TPM_MAX_ORDINAL 243
48#define TPM_MAX_PROTECTED_ORDINAL 12
49#define TPM_PROTECTED_ORDINAL_MASK 0xFF
50
9b3056cc
DT		 51/*
52 * Bug workaround - some TPM's don't flush the most
53 * recently changed pcr on suspend, so force the flush
54 * with an extend to the selected _unused_ non-volatile pcr.
55 */
56static int tpm_suspend_pcr;
57module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
58MODULE_PARM_DESC(suspend_pcr,
59 "PCR to use for dummy writes to faciltate flush on suspend.");
60
1da177e4
LT		 61static LIST_HEAD(tpm_chip_list);
62static DEFINE_SPINLOCK(driver_lock);
10685a95 63static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
1da177e4 64
9e18ee19
KJH		 65/*
66 * Array with one entry per ordinal defining the maximum amount
67 * of time the chip could take to return the result. The ordinal
68 * designation of short, medium or long is defined in a table in
69 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
70 * values of the SHORT, MEDIUM, and LONG durations are retrieved
71 * from the chip during initialization with a call to tpm_get_timeouts.
72 */
73static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
74 TPM_UNDEFINED, /* 0 */
75 TPM_UNDEFINED,
76 TPM_UNDEFINED,
77 TPM_UNDEFINED,
78 TPM_UNDEFINED,
79 TPM_UNDEFINED, /* 5 */
80 TPM_UNDEFINED,
81 TPM_UNDEFINED,
82 TPM_UNDEFINED,
83 TPM_UNDEFINED,
84 TPM_SHORT, /* 10 */
85 TPM_SHORT,
86};
87
88static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
89 TPM_UNDEFINED, /* 0 */
90 TPM_UNDEFINED,
91 TPM_UNDEFINED,
92 TPM_UNDEFINED,
93 TPM_UNDEFINED,
94 TPM_UNDEFINED, /* 5 */
95 TPM_UNDEFINED,
96 TPM_UNDEFINED,
97 TPM_UNDEFINED,
98 TPM_UNDEFINED,
99 TPM_SHORT, /* 10 */
100 TPM_SHORT,
101 TPM_MEDIUM,
102 TPM_LONG,
103 TPM_LONG,
104 TPM_MEDIUM, /* 15 */
105 TPM_SHORT,
106 TPM_SHORT,
107 TPM_MEDIUM,
108 TPM_LONG,
109 TPM_SHORT, /* 20 */
110 TPM_SHORT,
111 TPM_MEDIUM,
112 TPM_MEDIUM,
113 TPM_MEDIUM,
114 TPM_SHORT, /* 25 */
115 TPM_SHORT,
116 TPM_MEDIUM,
117 TPM_SHORT,
118 TPM_SHORT,
119 TPM_MEDIUM, /* 30 */
120 TPM_LONG,
121 TPM_MEDIUM,
122 TPM_SHORT,
123 TPM_SHORT,
124 TPM_SHORT, /* 35 */
125 TPM_MEDIUM,
126 TPM_MEDIUM,
127 TPM_UNDEFINED,
128 TPM_UNDEFINED,
129 TPM_MEDIUM, /* 40 */
130 TPM_LONG,
131 TPM_MEDIUM,
132 TPM_SHORT,
133 TPM_SHORT,
134 TPM_SHORT, /* 45 */
135 TPM_SHORT,
136 TPM_SHORT,
137 TPM_SHORT,
138 TPM_LONG,
139 TPM_MEDIUM, /* 50 */
140 TPM_MEDIUM,
141 TPM_UNDEFINED,
142 TPM_UNDEFINED,
143 TPM_UNDEFINED,
144 TPM_UNDEFINED, /* 55 */
145 TPM_UNDEFINED,
146 TPM_UNDEFINED,
147 TPM_UNDEFINED,
148 TPM_UNDEFINED,
149 TPM_MEDIUM, /* 60 */
150 TPM_MEDIUM,
151 TPM_MEDIUM,
152 TPM_SHORT,
153 TPM_SHORT,
154 TPM_MEDIUM, /* 65 */
155 TPM_UNDEFINED,
156 TPM_UNDEFINED,
157 TPM_UNDEFINED,
158 TPM_UNDEFINED,
159 TPM_SHORT, /* 70 */
160 TPM_SHORT,
161 TPM_UNDEFINED,
162 TPM_UNDEFINED,
163 TPM_UNDEFINED,
164 TPM_UNDEFINED, /* 75 */
165 TPM_UNDEFINED,
166 TPM_UNDEFINED,
167 TPM_UNDEFINED,
168 TPM_UNDEFINED,
169 TPM_LONG, /* 80 */
170 TPM_UNDEFINED,
171 TPM_MEDIUM,
172 TPM_LONG,
173 TPM_SHORT,
174 TPM_UNDEFINED, /* 85 */
175 TPM_UNDEFINED,
176 TPM_UNDEFINED,
177 TPM_UNDEFINED,
178 TPM_UNDEFINED,
179 TPM_SHORT, /* 90 */
180 TPM_SHORT,
181 TPM_SHORT,
182 TPM_SHORT,
183 TPM_SHORT,
184 TPM_UNDEFINED, /* 95 */
185 TPM_UNDEFINED,
186 TPM_UNDEFINED,
187 TPM_UNDEFINED,
188 TPM_UNDEFINED,
189 TPM_MEDIUM, /* 100 */
190 TPM_SHORT,
191 TPM_SHORT,
192 TPM_UNDEFINED,
193 TPM_UNDEFINED,
194 TPM_UNDEFINED, /* 105 */
195 TPM_UNDEFINED,
196 TPM_UNDEFINED,
197 TPM_UNDEFINED,
198 TPM_UNDEFINED,
199 TPM_SHORT, /* 110 */
200 TPM_SHORT,
201 TPM_SHORT,
202 TPM_SHORT,
203 TPM_SHORT,
204 TPM_SHORT, /* 115 */
205 TPM_SHORT,
206 TPM_SHORT,
207 TPM_UNDEFINED,
208 TPM_UNDEFINED,
209 TPM_LONG, /* 120 */
210 TPM_LONG,
211 TPM_MEDIUM,
212 TPM_UNDEFINED,
213 TPM_SHORT,
214 TPM_SHORT, /* 125 */
215 TPM_SHORT,
216 TPM_LONG,
217 TPM_SHORT,
218 TPM_SHORT,
219 TPM_SHORT, /* 130 */
220 TPM_MEDIUM,
221 TPM_UNDEFINED,
222 TPM_SHORT,
223 TPM_MEDIUM,
224 TPM_UNDEFINED, /* 135 */
225 TPM_UNDEFINED,
226 TPM_UNDEFINED,
227 TPM_UNDEFINED,
228 TPM_UNDEFINED,
229 TPM_SHORT, /* 140 */
230 TPM_SHORT,
231 TPM_UNDEFINED,
232 TPM_UNDEFINED,
233 TPM_UNDEFINED,
234 TPM_UNDEFINED, /* 145 */
235 TPM_UNDEFINED,
236 TPM_UNDEFINED,
237 TPM_UNDEFINED,
238 TPM_UNDEFINED,
239 TPM_SHORT, /* 150 */
240 TPM_MEDIUM,
241 TPM_MEDIUM,
242 TPM_SHORT,
243 TPM_SHORT,
244 TPM_UNDEFINED, /* 155 */
245 TPM_UNDEFINED,
246 TPM_UNDEFINED,
247 TPM_UNDEFINED,
248 TPM_UNDEFINED,
249 TPM_SHORT, /* 160 */
250 TPM_SHORT,
251 TPM_SHORT,
252 TPM_SHORT,
253 TPM_UNDEFINED,
254 TPM_UNDEFINED, /* 165 */
255 TPM_UNDEFINED,
256 TPM_UNDEFINED,
257 TPM_UNDEFINED,
258 TPM_UNDEFINED,
259 TPM_LONG, /* 170 */
260 TPM_UNDEFINED,
261 TPM_UNDEFINED,
262 TPM_UNDEFINED,
263 TPM_UNDEFINED,
264 TPM_UNDEFINED, /* 175 */
265 TPM_UNDEFINED,
266 TPM_UNDEFINED,
267 TPM_UNDEFINED,
268 TPM_UNDEFINED,
269 TPM_MEDIUM, /* 180 */
270 TPM_SHORT,
271 TPM_MEDIUM,
272 TPM_MEDIUM,
273 TPM_MEDIUM,
274 TPM_MEDIUM, /* 185 */
275 TPM_SHORT,
276 TPM_UNDEFINED,
277 TPM_UNDEFINED,
278 TPM_UNDEFINED,
279 TPM_UNDEFINED, /* 190 */
280 TPM_UNDEFINED,
281 TPM_UNDEFINED,
282 TPM_UNDEFINED,
283 TPM_UNDEFINED,
284 TPM_UNDEFINED, /* 195 */
285 TPM_UNDEFINED,
286 TPM_UNDEFINED,
287 TPM_UNDEFINED,
288 TPM_UNDEFINED,
289 TPM_SHORT, /* 200 */
290 TPM_UNDEFINED,
291 TPM_UNDEFINED,
292 TPM_UNDEFINED,
293 TPM_SHORT,
294 TPM_SHORT, /* 205 */
295 TPM_SHORT,
296 TPM_SHORT,
297 TPM_SHORT,
298 TPM_SHORT,
299 TPM_MEDIUM, /* 210 */
300 TPM_UNDEFINED,
301 TPM_MEDIUM,
302 TPM_MEDIUM,
303 TPM_MEDIUM,
304 TPM_UNDEFINED, /* 215 */
305 TPM_MEDIUM,
306 TPM_UNDEFINED,
307 TPM_UNDEFINED,
308 TPM_SHORT,
309 TPM_SHORT, /* 220 */
310 TPM_SHORT,
311 TPM_SHORT,
312 TPM_SHORT,
313 TPM_SHORT,
314 TPM_UNDEFINED, /* 225 */
315 TPM_UNDEFINED,
316 TPM_UNDEFINED,
317 TPM_UNDEFINED,
318 TPM_UNDEFINED,
319 TPM_SHORT, /* 230 */
320 TPM_LONG,
321 TPM_MEDIUM,
322 TPM_UNDEFINED,
323 TPM_UNDEFINED,
324 TPM_UNDEFINED, /* 235 */
325 TPM_UNDEFINED,
326 TPM_UNDEFINED,
327 TPM_UNDEFINED,
328 TPM_UNDEFINED,
329 TPM_SHORT, /* 240 */
330 TPM_UNDEFINED,
331 TPM_MEDIUM,
332};
333
1da177e4
LT		 334static void user_reader_timeout(unsigned long ptr)
335{
336 struct tpm_chip *chip = (struct tpm_chip *) ptr;
337
09e12f9f
KJH		 338 schedule_work(&chip->work);
339}
340
c4028958 341static void timeout_work(struct work_struct *work)
09e12f9f 342{
c4028958 343 struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
09e12f9f 344
d081d470 345 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 346 atomic_set(&chip->data_pending, 0);
347 memset(chip->data_buffer, 0, TPM_BUFSIZE);
d081d470 348 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 349}
350
9e18ee19
KJH		 351/*
352 * Returns max number of jiffies to wait
353 */
354unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
355 u32 ordinal)
356{
357 int duration_idx = TPM_UNDEFINED;
358 int duration = 0;
359
360 if (ordinal < TPM_MAX_ORDINAL)
361 duration_idx = tpm_ordinal_duration[ordinal];
362 else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
363 TPM_MAX_PROTECTED_ORDINAL)
364 duration_idx =
365 tpm_protected_ordinal_duration[ordinal &
366 TPM_PROTECTED_ORDINAL_MASK];
367
8d1dc20e 368 if (duration_idx != TPM_UNDEFINED)
36b20020 369 duration = chip->vendor.duration[duration_idx];
8d1dc20e 370 if (duration <= 0)
9e18ee19 371 return 2 * 60 * HZ;
8d1dc20e
LT		 372 else
373 return duration;
9e18ee19
KJH		 374}
375EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
376
1da177e4
LT		 377/*
378 * Internal kernel interface to transmit TPM commands
379 */
380static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
381 size_t bufsiz)
382{
d9e5b6bf 383 ssize_t rc;
9e18ee19 384 u32 count, ordinal;
700d8bdc 385 unsigned long stop;
1da177e4 386
6b07d30a
PH		 387 if (bufsiz > TPM_BUFSIZE)
388 bufsiz = TPM_BUFSIZE;
389
81179bb6 390 count = be32_to_cpu(*((__be32 *) (buf + 2)));
9e18ee19 391 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
1da177e4
LT		 392 if (count == 0)
393 return -ENODATA;
394 if (count > bufsiz) {
e659a3fe 395 dev_err(chip->dev,
b76be681 396 "invalid count value %x %zx \n", count, bufsiz);
1da177e4
LT		 397 return -E2BIG;
398 }
399
d081d470 400 mutex_lock(&chip->tpm_mutex);
1da177e4 401
90dda520 402 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
e659a3fe 403 dev_err(chip->dev,
d9e5b6bf
KH		 404 "tpm_transmit: tpm_send: error %zd\n", rc);
405 goto out;
1da177e4
LT		 406 }
407
27084efe
LD		 408 if (chip->vendor.irq)
409 goto out_recv;
410
9e18ee19 411 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
1da177e4 412 do {
90dda520
KJH		 413 u8 status = chip->vendor.status(chip);
414 if ((status & chip->vendor.req_complete_mask) ==
415 chip->vendor.req_complete_val)
1da177e4 416 goto out_recv;
d9e5b6bf 417
90dda520 418 if ((status == chip->vendor.req_canceled)) {
e659a3fe 419 dev_err(chip->dev, "Operation Canceled\n");
d9e5b6bf
KH		 420 rc = -ECANCELED;
421 goto out;
422 }
423
424 msleep(TPM_TIMEOUT); /* CHECK */
1da177e4 425 rmb();
700d8bdc 426 } while (time_before(jiffies, stop));
1da177e4 427
90dda520 428 chip->vendor.cancel(chip);
e659a3fe 429 dev_err(chip->dev, "Operation Timed out\n");
d9e5b6bf
KH		 430 rc = -ETIME;
431 goto out;
1da177e4
LT		 432
433out_recv:
90dda520 434 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
d9e5b6bf 435 if (rc < 0)
e659a3fe 436 dev_err(chip->dev,
d9e5b6bf
KH		 437 "tpm_transmit: tpm_recv: error %zd\n", rc);
438out:
d081d470 439 mutex_unlock(&chip->tpm_mutex);
d9e5b6bf 440 return rc;
1da177e4
LT		 441}
442
443#define TPM_DIGEST_SIZE 20
beed53a1 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;
b9e3238a
RA		 472 else if (len < TPM_HEADER_SIZE)
473 return -EFAULT;
474
475 err = be32_to_cpu(cmd->header.out.return_code);
476 if (err != 0)
477 dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
478
479 return err;
beed53a1
KJH		 480}
481
08837438
RA		 482#define TPM_INTERNAL_RESULT_SIZE 200
483#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
484#define TPM_ORD_GET_CAP cpu_to_be32(101)
485
486static const struct tpm_input_header tpm_getcap_header = {
487 .tag = TPM_TAG_RQU_COMMAND,
488 .length = cpu_to_be32(22),
489 .ordinal = TPM_ORD_GET_CAP
490};
491
492ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
493 const char *desc)
494{
495 struct tpm_cmd_t tpm_cmd;
496 int rc;
497 struct tpm_chip *chip = dev_get_drvdata(dev);
498
499 tpm_cmd.header.in = tpm_getcap_header;
500 if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
501 tpm_cmd.params.getcap_in.cap = subcap_id;
502 /*subcap field not necessary */
503 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
504 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
505 } else {
506 if (subcap_id == TPM_CAP_FLAG_PERM ||
507 subcap_id == TPM_CAP_FLAG_VOL)
508 tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
509 else
510 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
511 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
512 tpm_cmd.params.getcap_in.subcap = subcap_id;
513 }
514 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
515 if (!rc)
516 *cap = tpm_cmd.params.getcap_out.cap;
517 return rc;
518}
519
08e96e48
KJH		 520void tpm_gen_interrupt(struct tpm_chip *chip)
521{
08837438 522 struct tpm_cmd_t tpm_cmd;
08e96e48
KJH		 523 ssize_t rc;
524
08837438
RA		 525 tpm_cmd.header.in = tpm_getcap_header;
526 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
527 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
528 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 529
08837438 530 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 531 "attempting to determine the timeouts");
532}
533EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
534
2b30a90f 535int tpm_get_timeouts(struct tpm_chip *chip)
08e96e48 536{
08837438
RA		 537 struct tpm_cmd_t tpm_cmd;
538 struct timeout_t *timeout_cap;
539 struct duration_t *duration_cap;
08e96e48
KJH		 540 ssize_t rc;
541 u32 timeout;
e3e1a1e1 542 unsigned int scale = 1;
08e96e48 543
08837438
RA		 544 tpm_cmd.header.in = tpm_getcap_header;
545 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
546 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
547 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 548
08837438 549 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 550 "attempting to determine the timeouts");
551 if (rc)
552 goto duration;
553
829bf067
SB		 554 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
555 be32_to_cpu(tpm_cmd.header.out.length)
556 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
2b30a90f 557 return -EINVAL;
08e96e48 558
08837438 559 timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
08e96e48 560 /* Don't overwrite default if value is 0 */
08837438 561 timeout = be32_to_cpu(timeout_cap->a);
e3e1a1e1
SB		 562 if (timeout && timeout < 1000) {
563 /* timeouts in msec rather usec */
564 scale = 1000;
62592101 565 chip->vendor.timeout_adjusted = true;
e3e1a1e1 566 }
08e96e48 567 if (timeout)
e3e1a1e1 568 chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
08837438 569 timeout = be32_to_cpu(timeout_cap->b);
08e96e48 570 if (timeout)
e3e1a1e1 571 chip->vendor.timeout_b = usecs_to_jiffies(timeout * scale);
08837438 572 timeout = be32_to_cpu(timeout_cap->c);
08e96e48 573 if (timeout)
e3e1a1e1 574 chip->vendor.timeout_c = usecs_to_jiffies(timeout * scale);
08837438 575 timeout = be32_to_cpu(timeout_cap->d);
08e96e48 576 if (timeout)
e3e1a1e1 577 chip->vendor.timeout_d = usecs_to_jiffies(timeout * scale);
08e96e48
KJH		 578
579duration:
08837438
RA		 580 tpm_cmd.header.in = tpm_getcap_header;
581 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
582 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
583 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
08e96e48 584
08837438 585 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 586 "attempting to determine the durations");
587 if (rc)
2b30a90f 588 return rc;
08e96e48 589
979b1406
SB		 590 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
591 be32_to_cpu(tpm_cmd.header.out.length)
592 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
2b30a90f 593 return -EINVAL;
979b1406 594
08837438 595 duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
08e96e48 596 chip->vendor.duration[TPM_SHORT] =
08837438 597 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
e934acca
SB		 598 chip->vendor.duration[TPM_MEDIUM] =
599 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
600 chip->vendor.duration[TPM_LONG] =
601 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
602
292cf4a8
VK		 603 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
604 * value wrong and apparently reports msecs rather than usecs. So we
605 * fix up the resulting too-small TPM_SHORT value to make things work.
e934acca 606 * We also scale the TPM_MEDIUM and -_LONG values by 1000.
292cf4a8 607 */
e934acca 608 if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
292cf4a8 609 chip->vendor.duration[TPM_SHORT] = HZ;
e934acca
SB		 610 chip->vendor.duration[TPM_MEDIUM] *= 1000;
611 chip->vendor.duration[TPM_LONG] *= 1000;
04ab2293 612 chip->vendor.duration_adjusted = true;
e934acca
SB		 613 dev_info(chip->dev, "Adjusting TPM timeout parameters.");
614 }
2b30a90f 615 return 0;
08e96e48
KJH		 616}
617EXPORT_SYMBOL_GPL(tpm_get_timeouts);
618
d97c6ade
SB		 619#define TPM_ORD_CONTINUE_SELFTEST 83
620#define CONTINUE_SELFTEST_RESULT_SIZE 10
621
622static struct tpm_input_header continue_selftest_header = {
623 .tag = TPM_TAG_RQU_COMMAND,
624 .length = cpu_to_be32(10),
625 .ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
626};
627
628/**
629 * tpm_continue_selftest -- run TPM's selftest
630 * @chip: TPM chip to use
631 *
632 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
633 * a TPM error code.
634 */
68d6e671 635static int tpm_continue_selftest(struct tpm_chip *chip)
08e96e48 636{
d97c6ade
SB		 637 int rc;
638 struct tpm_cmd_t cmd;
08e96e48 639
d97c6ade
SB		 640 cmd.header.in = continue_selftest_header;
641 rc = transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
642 "continue selftest");
643 return rc;
08e96e48 644}
08e96e48
KJH		 645
646ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
647 char *buf)
648{
08837438 649 cap_t cap;
08e96e48
KJH		 650 ssize_t rc;
651
08837438
RA		 652 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
653 "attempting to determine the permanent enabled state");
654 if (rc)
08e96e48 655 return 0;
ec288bd3 656
08837438 657 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
ec288bd3 658 return rc;
08e96e48
KJH		 659}
660EXPORT_SYMBOL_GPL(tpm_show_enabled);
661
662ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
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 active state");
670 if (rc)
08e96e48 671 return 0;
ec288bd3 672
08837438 673 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
ec288bd3 674 return rc;
08e96e48
KJH		 675}
676EXPORT_SYMBOL_GPL(tpm_show_active);
677
678ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
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_PROP_OWNER, &cap,
685 "attempting to determine the owner state");
686 if (rc)
08e96e48 687 return 0;
ec288bd3 688
08837438 689 rc = sprintf(buf, "%d\n", cap.owned);
ec288bd3 690 return rc;
08e96e48
KJH		 691}
692EXPORT_SYMBOL_GPL(tpm_show_owned);
693
694ssize_t tpm_show_temp_deactivated(struct device * dev,
695 struct device_attribute * attr, char *buf)
696{
08837438 697 cap_t cap;
08e96e48
KJH		 698 ssize_t rc;
699
08837438
RA		 700 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
701 "attempting to determine the temporary state");
702 if (rc)
08e96e48 703 return 0;
ec288bd3 704
08837438 705 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
ec288bd3 706 return rc;
08e96e48
KJH		 707}
708EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
709
659aaf2b
RA		 710/*
711 * tpm_chip_find_get - return tpm_chip for given chip number
712 */
713static struct tpm_chip *tpm_chip_find_get(int chip_num)
714{
8920d5ad 715 struct tpm_chip *pos, *chip = NULL;
659aaf2b
RA		 716
717 rcu_read_lock();
718 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
719 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
720 continue;
721
8920d5ad
RA		 722 if (try_module_get(pos->dev->driver->owner)) {
723 chip = pos;
659aaf2b 724 break;
8920d5ad 725 }
659aaf2b
RA		 726 }
727 rcu_read_unlock();
8920d5ad 728 return chip;
659aaf2b
RA		 729}
730
731#define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
732#define READ_PCR_RESULT_SIZE 30
733static struct tpm_input_header pcrread_header = {
734 .tag = TPM_TAG_RQU_COMMAND,
735 .length = cpu_to_be32(14),
736 .ordinal = TPM_ORDINAL_PCRREAD
1da177e4
LT		 737};
738
68d6e671 739static int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
659aaf2b
RA		 740{
741 int rc;
742 struct tpm_cmd_t cmd;
743
744 cmd.header.in = pcrread_header;
745 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
23acb98d 746 rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
659aaf2b
RA		 747 "attempting to read a pcr value");
748
749 if (rc == 0)
750 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
751 TPM_DIGEST_SIZE);
752 return rc;
753}
754
755/**
756 * tpm_pcr_read - read a pcr value
757 * @chip_num: tpm idx # or ANY
758 * @pcr_idx: pcr idx to retrieve
759 * @res_buf: TPM_PCR value
760 * size of res_buf is 20 bytes (or NULL if you don't care)
761 *
762 * The TPM driver should be built-in, but for whatever reason it
763 * isn't, protect against the chip disappearing, by incrementing
764 * the module usage count.
765 */
766int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
767{
768 struct tpm_chip *chip;
769 int rc;
770
771 chip = tpm_chip_find_get(chip_num);
772 if (chip == NULL)
773 return -ENODEV;
774 rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
a0e39349 775 tpm_chip_put(chip);
659aaf2b
RA		 776 return rc;
777}
778EXPORT_SYMBOL_GPL(tpm_pcr_read);
779
780/**
781 * tpm_pcr_extend - extend pcr value with hash
782 * @chip_num: tpm idx # or AN&
783 * @pcr_idx: pcr idx to extend
784 * @hash: hash value used to extend pcr value
785 *
786 * The TPM driver should be built-in, but for whatever reason it
787 * isn't, protect against the chip disappearing, by incrementing
788 * the module usage count.
789 */
790#define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
0afd9056 791#define EXTEND_PCR_RESULT_SIZE 34
659aaf2b
RA		 792static struct tpm_input_header pcrextend_header = {
793 .tag = TPM_TAG_RQU_COMMAND,
794 .length = cpu_to_be32(34),
795 .ordinal = TPM_ORD_PCR_EXTEND
796};
797
798int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
799{
800 struct tpm_cmd_t cmd;
801 int rc;
802 struct tpm_chip *chip;
803
804 chip = tpm_chip_find_get(chip_num);
805 if (chip == NULL)
806 return -ENODEV;
807
808 cmd.header.in = pcrextend_header;
659aaf2b
RA		 809 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
810 memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
0afd9056 811 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
659aaf2b
RA		 812 "attempting extend a PCR value");
813
a0e39349 814 tpm_chip_put(chip);
659aaf2b
RA		 815 return rc;
816}
817EXPORT_SYMBOL_GPL(tpm_pcr_extend);
818
68d6e671
SB		 819/**
820 * tpm_do_selftest - have the TPM continue its selftest and wait until it
821 * can receive further commands
822 * @chip: TPM chip to use
823 *
824 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
825 * a TPM error code.
826 */
827int tpm_do_selftest(struct tpm_chip *chip)
828{
829 int rc;
830 u8 digest[TPM_DIGEST_SIZE];
831 unsigned int loops;
832 unsigned int delay_msec = 1000;
833 unsigned long duration;
834
835 duration = tpm_calc_ordinal_duration(chip,
836 TPM_ORD_CONTINUE_SELFTEST);
837
838 loops = jiffies_to_msecs(duration) / delay_msec;
839
840 rc = tpm_continue_selftest(chip);
841 /* This may fail if there was no TPM driver during a suspend/resume
842 * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST)
843 */
844 if (rc)
845 return rc;
846
847 do {
848 rc = __tpm_pcr_read(chip, 0, digest);
849 if (rc != TPM_WARN_DOING_SELFTEST)
850 return rc;
851 msleep(delay_msec);
852 } while (--loops > 0);
853
854 return rc;
855}
856EXPORT_SYMBOL_GPL(tpm_do_selftest);
857
c749ba91
MZ		 858int tpm_send(u32 chip_num, void *cmd, size_t buflen)
859{
860 struct tpm_chip *chip;
861 int rc;
862
863 chip = tpm_chip_find_get(chip_num);
864 if (chip == NULL)
865 return -ENODEV;
866
867 rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
868
869 tpm_chip_put(chip);
870 return rc;
871}
872EXPORT_SYMBOL_GPL(tpm_send);
873
6659ca2a
KH		 874ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
875 char *buf)
1da177e4 876{
08837438 877 cap_t cap;
659aaf2b 878 u8 digest[TPM_DIGEST_SIZE];
beed53a1 879 ssize_t rc;
81179bb6 880 int i, j, num_pcrs;
1da177e4 881 char *str = buf;
e659a3fe 882 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 883
08837438 884 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
beed53a1 885 "attempting to determine the number of PCRS");
08837438 886 if (rc)
e234bc97 887 return 0;
1da177e4 888
08837438 889 num_pcrs = be32_to_cpu(cap.num_pcrs);
1da177e4 890 for (i = 0; i < num_pcrs; i++) {
659aaf2b 891 rc = __tpm_pcr_read(chip, i, digest);
beed53a1 892 if (rc)
08837438 893 break;
1da177e4
LT		 894 str += sprintf(str, "PCR-%02d: ", i);
895 for (j = 0; j < TPM_DIGEST_SIZE; j++)
659aaf2b 896 str += sprintf(str, "%02X ", digest[j]);
1da177e4
LT		 897 str += sprintf(str, "\n");
898 }
899 return str - buf;
900}
6659ca2a 901EXPORT_SYMBOL_GPL(tpm_show_pcrs);
1da177e4
LT		 902
903#define READ_PUBEK_RESULT_SIZE 314
08837438
RA		 904#define TPM_ORD_READPUBEK cpu_to_be32(124)
905struct tpm_input_header tpm_readpubek_header = {
906 .tag = TPM_TAG_RQU_COMMAND,
907 .length = cpu_to_be32(30),
908 .ordinal = TPM_ORD_READPUBEK
1da177e4
LT		 909};
910
6659ca2a
KH		 911ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
912 char *buf)
1da177e4 913{
2df7111f 914 u8 *data;
08837438 915 struct tpm_cmd_t tpm_cmd;
beed53a1 916 ssize_t err;
81179bb6 917 int i, rc;
1da177e4
LT		 918 char *str = buf;
919
e659a3fe 920 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 921
08837438
RA		 922 tpm_cmd.header.in = tpm_readpubek_header;
923 err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
beed53a1
KJH		 924 "attempting to read the PUBEK");
925 if (err)
34d6e075 926 goto out;
1da177e4
LT		 927
928 /*
929 ignore header 10 bytes
930 algorithm 32 bits (1 == RSA )
931 encscheme 16 bits
932 sigscheme 16 bits
933 parameters (RSA 12->bytes: keybit, #primes, expbit)
934 keylenbytes 32 bits
935 256 byte modulus
936 ignore checksum 20 bytes
937 */
08837438 938 data = tpm_cmd.params.readpubek_out_buffer;
1da177e4
LT		 939 str +=
940 sprintf(str,
5a79444f
SB		 941 "Algorithm: %02X %02X %02X %02X\n"
942 "Encscheme: %02X %02X\n"
943 "Sigscheme: %02X %02X\n"
944 "Parameters: %02X %02X %02X %02X "
945 "%02X %02X %02X %02X "
946 "%02X %02X %02X %02X\n"
947 "Modulus length: %d\n"
948 "Modulus:\n",
949 data[0], data[1], data[2], data[3],
950 data[4], data[5],
951 data[6], data[7],
952 data[12], data[13], data[14], data[15],
953 data[16], data[17], data[18], data[19],
954 data[20], data[21], data[22], data[23],
955 be32_to_cpu(*((__be32 *) (data + 24))));
1da177e4
LT		 956
957 for (i = 0; i < 256; i++) {
5a79444f 958 str += sprintf(str, "%02X ", data[i + 28]);
1da177e4
LT		 959 if ((i + 1) % 16 == 0)
960 str += sprintf(str, "\n");
961 }
34d6e075 962out:
beed53a1 963 rc = str - buf;
2df7111f 964 return rc;
1da177e4 965}
6659ca2a 966EXPORT_SYMBOL_GPL(tpm_show_pubek);
1da177e4 967
1da177e4 968
6659ca2a
KH		 969ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
970 char *buf)
1da177e4 971{
08837438 972 cap_t cap;
beed53a1 973 ssize_t rc;
1da177e4
LT		 974 char *str = buf;
975
08837438 976 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
beed53a1 977 "attempting to determine the manufacturer");
08837438 978 if (rc)
beed53a1 979 return 0;
1da177e4 980 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438 981 be32_to_cpu(cap.manufacturer_id));
1da177e4 982
08837438
RA		 983 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
984 "attempting to determine the 1.1 version");
beed53a1 985 if (rc)
08837438 986 return 0;
beed53a1
KJH		 987 str += sprintf(str,
988 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 989 cap.tpm_version.Major, cap.tpm_version.Minor,
990 cap.tpm_version.revMajor, cap.tpm_version.revMinor);
1da177e4
LT		 991 return str - buf;
992}
6659ca2a
KH		 993EXPORT_SYMBOL_GPL(tpm_show_caps);
994
08e96e48
KJH		 995ssize_t tpm_show_caps_1_2(struct device * dev,
996 struct device_attribute * attr, char *buf)
997{
08837438
RA		 998 cap_t cap;
999 ssize_t rc;
08e96e48
KJH		 1000 char *str = buf;
1001
08837438
RA		 1002 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
1003 "attempting to determine the manufacturer");
1004 if (rc)
08e96e48 1005 return 0;
08e96e48 1006 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438
RA		 1007 be32_to_cpu(cap.manufacturer_id));
1008 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
1009 "attempting to determine the 1.2 version");
1010 if (rc)
1011 return 0;
08e96e48
KJH		 1012 str += sprintf(str,
1013 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 1014 cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
1015 cap.tpm_version_1_2.revMajor,
1016 cap.tpm_version_1_2.revMinor);
08e96e48
KJH		 1017 return str - buf;
1018}
1019EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
1020
04ab2293
SB		 1021ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
1022 char *buf)
1023{
1024 struct tpm_chip *chip = dev_get_drvdata(dev);
1025
403d1d03
SB		 1026 if (chip->vendor.duration[TPM_LONG] == 0)
1027 return 0;
1028
04ab2293
SB		 1029 return sprintf(buf, "%d %d %d [%s]\n",
1030 jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
1031 jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
1032 jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
1033 chip->vendor.duration_adjusted
1034 ? "adjusted" : "original");
1035}
1036EXPORT_SYMBOL_GPL(tpm_show_durations);
1037
62592101
SB		 1038ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
1039 char *buf)
1040{
1041 struct tpm_chip *chip = dev_get_drvdata(dev);
1042
1043 return sprintf(buf, "%d %d %d %d [%s]\n",
1044 jiffies_to_usecs(chip->vendor.timeout_a),
1045 jiffies_to_usecs(chip->vendor.timeout_b),
1046 jiffies_to_usecs(chip->vendor.timeout_c),
1047 jiffies_to_usecs(chip->vendor.timeout_d),
1048 chip->vendor.timeout_adjusted
1049 ? "adjusted" : "original");
1050}
1051EXPORT_SYMBOL_GPL(tpm_show_timeouts);
1052
6659ca2a
KH		 1053ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
1054 const char *buf, size_t count)
1055{
1056 struct tpm_chip *chip = dev_get_drvdata(dev);
1057 if (chip == NULL)
1058 return 0;
1059
90dda520 1060 chip->vendor.cancel(chip);
6659ca2a
KH		 1061 return count;
1062}
1063EXPORT_SYMBOL_GPL(tpm_store_cancel);
1da177e4 1064
fd048866
RA		 1065int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
1066 wait_queue_head_t *queue)
1067{
1068 unsigned long stop;
1069 long rc;
1070 u8 status;
1071
1072 /* check current status */
1073 status = chip->vendor.status(chip);
1074 if ((status & mask) == mask)
1075 return 0;
1076
1077 stop = jiffies + timeout;
1078
1079 if (chip->vendor.irq) {
1080again:
1081 timeout = stop - jiffies;
1082 if ((long)timeout <= 0)
1083 return -ETIME;
1084 rc = wait_event_interruptible_timeout(*queue,
1085 ((chip->vendor.status(chip)
1086 & mask) == mask),
1087 timeout);
1088 if (rc > 0)
1089 return 0;
1090 if (rc == -ERESTARTSYS && freezing(current)) {
1091 clear_thread_flag(TIF_SIGPENDING);
1092 goto again;
1093 }
1094 } else {
1095 do {
1096 msleep(TPM_TIMEOUT);
1097 status = chip->vendor.status(chip);
1098 if ((status & mask) == mask)
1099 return 0;
1100 } while (time_before(jiffies, stop));
1101 }
1102 return -ETIME;
1103}
1104EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
1da177e4
LT		 1105/*
1106 * Device file system interface to the TPM
f89c5edb
RA		 1107 *
1108 * It's assured that the chip will be opened just once,
1109 * by the check of is_open variable, which is protected
1110 * by driver_lock.
1da177e4
LT		 1111 */
1112int tpm_open(struct inode *inode, struct file *file)
1113{
f02a9364 1114 int minor = iminor(inode);
1da177e4
LT		 1115 struct tpm_chip *chip = NULL, *pos;
1116
f02a9364
RA		 1117 rcu_read_lock();
1118 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
90dda520 1119 if (pos->vendor.miscdev.minor == minor) {
1da177e4 1120 chip = pos;
f02a9364 1121 get_device(chip->dev);
1da177e4
LT		 1122 break;
1123 }
1124 }
f02a9364 1125 rcu_read_unlock();
1da177e4 1126
f02a9364
RA		 1127 if (!chip)
1128 return -ENODEV;
1da177e4 1129
dc36d32c 1130 if (test_and_set_bit(0, &chip->is_open)) {
b888c87b 1131 dev_dbg(chip->dev, "Another process owns this TPM\n");
f02a9364
RA		 1132 put_device(chip->dev);
1133 return -EBUSY;
1da177e4
LT		 1134 }
1135
1309d7af 1136 chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
1da177e4 1137 if (chip->data_buffer == NULL) {
dc36d32c 1138 clear_bit(0, &chip->is_open);
e659a3fe 1139 put_device(chip->dev);
1da177e4
LT		 1140 return -ENOMEM;
1141 }
1142
1143 atomic_set(&chip->data_pending, 0);
1144
1145 file->private_data = chip;
1146 return 0;
1da177e4 1147}
1da177e4
LT		 1148EXPORT_SYMBOL_GPL(tpm_open);
1149
f02a9364
RA		 1150/*
1151 * Called on file close
1152 */
1da177e4
LT		 1153int tpm_release(struct inode *inode, struct file *file)
1154{
1155 struct tpm_chip *chip = file->private_data;
1da177e4 1156
4bdec11f 1157 del_singleshot_timer_sync(&chip->user_read_timer);
2e5c44c9 1158 flush_work_sync(&chip->work);
5e976d55 1159 file->private_data = NULL;
1da177e4 1160 atomic_set(&chip->data_pending, 0);
f02a9364 1161 kfree(chip->data_buffer);
dc36d32c 1162 clear_bit(0, &chip->is_open);
e659a3fe 1163 put_device(chip->dev);
1da177e4
LT		 1164 return 0;
1165}
1da177e4
LT		 1166EXPORT_SYMBOL_GPL(tpm_release);
1167
b888c87b 1168ssize_t tpm_write(struct file *file, const char __user *buf,
3c2f606a 1169 size_t size, loff_t *off)
1da177e4
LT		 1170{
1171 struct tpm_chip *chip = file->private_data;
01476001 1172 size_t in_size = size, out_size;
1da177e4
LT		 1173
1174 /* cannot perform a write until the read has cleared
1175 either via tpm_read or a user_read_timer timeout */
700d8bdc
NA		 1176 while (atomic_read(&chip->data_pending) != 0)
1177 msleep(TPM_TIMEOUT);
1da177e4 1178
d081d470 1179 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 1180
1181 if (in_size > TPM_BUFSIZE)
1182 in_size = TPM_BUFSIZE;
1183
1184 if (copy_from_user
1185 (chip->data_buffer, (void __user *) buf, in_size)) {
d081d470 1186 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1187 return -EFAULT;
1188 }
1189
1190 /* atomic tpm command send and result receive */
1191 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1192
1193 atomic_set(&chip->data_pending, out_size);
d081d470 1194 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1195
1196 /* Set a timeout by which the reader must come claim the result */
fe3fd483 1197 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1da177e4
LT		 1198
1199 return in_size;
1200}
1da177e4
LT		 1201EXPORT_SYMBOL_GPL(tpm_write);
1202
3c2f606a
KJH		 1203ssize_t tpm_read(struct file *file, char __user *buf,
1204 size_t size, loff_t *off)
1da177e4
LT		 1205{
1206 struct tpm_chip *chip = file->private_data;
01476001 1207 ssize_t ret_size;
3321c07a 1208 int rc;
1da177e4 1209
5b44bd58 1210 del_singleshot_timer_sync(&chip->user_read_timer);
2e5c44c9 1211 flush_work_sync(&chip->work);
5b44bd58
KH		 1212 ret_size = atomic_read(&chip->data_pending);
1213 atomic_set(&chip->data_pending, 0);
1214 if (ret_size > 0) { /* relay data */
1215 if (size < ret_size)
1216 ret_size = size;
1da177e4 1217
d081d470 1218 mutex_lock(&chip->buffer_mutex);
3321c07a
PH		 1219 rc = copy_to_user(buf, chip->data_buffer, ret_size);
1220 memset(chip->data_buffer, 0, ret_size);
1221 if (rc)
5b44bd58 1222 ret_size = -EFAULT;
3321c07a 1223
d081d470 1224 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1225 }
1226
1227 return ret_size;
1228}
1da177e4
LT		 1229EXPORT_SYMBOL_GPL(tpm_read);
1230
e659a3fe 1231void tpm_remove_hardware(struct device *dev)
1da177e4 1232{
e659a3fe 1233 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1234
1235 if (chip == NULL) {
e659a3fe 1236 dev_err(dev, "No device data found\n");
1da177e4
LT		 1237 return;
1238 }
1239
1240 spin_lock(&driver_lock);
f02a9364 1241 list_del_rcu(&chip->list);
1da177e4 1242 spin_unlock(&driver_lock);
f02a9364 1243 synchronize_rcu();
1da177e4 1244
90dda520 1245 misc_deregister(&chip->vendor.miscdev);
90dda520 1246 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
55a82ab3 1247 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1248
5bd91f18
RM		 1249 /* write it this way to be explicit (chip->dev == dev) */
1250 put_device(chip->dev);
1da177e4 1251}
e659a3fe 1252EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4 1253
225a9be2
RA		 1254#define TPM_ORD_SAVESTATE cpu_to_be32(152)
1255#define SAVESTATE_RESULT_SIZE 10
1256
1257static struct tpm_input_header savestate_header = {
1258 .tag = TPM_TAG_RQU_COMMAND,
1259 .length = cpu_to_be32(10),
1260 .ordinal = TPM_ORD_SAVESTATE
1261};
1262
1da177e4
LT		 1263/*
1264 * We are about to suspend. Save the TPM state
1265 * so that it can be restored.
1266 */
ce2c87d4 1267int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1da177e4 1268{
ce2c87d4 1269 struct tpm_chip *chip = dev_get_drvdata(dev);
225a9be2
RA		 1270 struct tpm_cmd_t cmd;
1271 int rc;
1272
1273 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
2490c681 1274
1da177e4
LT		 1275 if (chip == NULL)
1276 return -ENODEV;
1277
225a9be2
RA		 1278 /* for buggy tpm, flush pcrs with extend to selected dummy */
1279 if (tpm_suspend_pcr) {
1280 cmd.header.in = pcrextend_header;
1281 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1282 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1283 TPM_DIGEST_SIZE);
1284 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1285 "extending dummy pcr before suspend");
1286 }
1287
1288 /* now do the actual savestate */
1289 cmd.header.in = savestate_header;
1290 rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
1291 "sending savestate before suspend");
1292 return rc;
1da177e4 1293}
1da177e4
LT		 1294EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1295
1296/*
1297 * Resume from a power safe. The BIOS already restored
1298 * the TPM state.
1299 */
ce2c87d4 1300int tpm_pm_resume(struct device *dev)
1da177e4 1301{
ce2c87d4 1302 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1303
1304 if (chip == NULL)
1305 return -ENODEV;
1306
1da177e4
LT		 1307 return 0;
1308}
1da177e4
LT		 1309EXPORT_SYMBOL_GPL(tpm_pm_resume);
1310
253115b7
RA		 1311/* In case vendor provided release function, call it too.*/
1312
1313void tpm_dev_vendor_release(struct tpm_chip *chip)
1314{
1315 if (chip->vendor.release)
1316 chip->vendor.release(chip->dev);
1317
1318 clear_bit(chip->dev_num, dev_mask);
1319 kfree(chip->vendor.miscdev.name);
1320}
1321EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1322
1323
5bd91f18
RM		 1324/*
1325 * Once all references to platform device are down to 0,
1326 * release all allocated structures.
5bd91f18 1327 */
cbb2ed4a 1328void tpm_dev_release(struct device *dev)
5bd91f18
RM		 1329{
1330 struct tpm_chip *chip = dev_get_drvdata(dev);
1331
253115b7 1332 tpm_dev_vendor_release(chip);
5bd91f18 1333
253115b7 1334 chip->release(dev);
5bd91f18
RM		 1335 kfree(chip);
1336}
253115b7 1337EXPORT_SYMBOL_GPL(tpm_dev_release);
5bd91f18 1338
1da177e4
LT		 1339/*
1340 * Called from tpm_<specific>.c probe function only for devices
1341 * the driver has determined it should claim. Prior to calling
1342 * this function the specific probe function has called pci_enable_device
1343 * upon errant exit from this function specific probe function should call
1344 * pci_disable_device
1345 */
f02a9364
RA		 1346struct tpm_chip *tpm_register_hardware(struct device *dev,
1347 const struct tpm_vendor_specific *entry)
1da177e4 1348{
6f9beccb
KJH		 1349#define DEVNAME_SIZE 7
1350
1351 char *devname;
1da177e4 1352 struct tpm_chip *chip;
1da177e4
LT		 1353
1354 /* Driver specific per-device data */
b888c87b 1355 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
8e39c933
PW		 1356 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1357
dd78c943
AM		 1358 if (chip == NULL || devname == NULL)
1359 goto out_free;
1da177e4 1360
d081d470
MK		 1361 mutex_init(&chip->buffer_mutex);
1362 mutex_init(&chip->tpm_mutex);
1da177e4
LT		 1363 INIT_LIST_HEAD(&chip->list);
1364
c4028958 1365 INIT_WORK(&chip->work, timeout_work);
09e12f9f 1366
40565f19
JS		 1367 setup_timer(&chip->user_read_timer, user_reader_timeout,
1368 (unsigned long)chip);
fe3fd483 1369
90dda520 1370 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4 1371
10685a95 1372 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1da177e4 1373
10685a95 1374 if (chip->dev_num >= TPM_NUM_DEVICES) {
b888c87b 1375 dev_err(dev, "No available tpm device numbers\n");
dd78c943 1376 goto out_free;
1da177e4 1377 } else if (chip->dev_num == 0)
90dda520 1378 chip->vendor.miscdev.minor = TPM_MINOR;
1da177e4 1379 else
90dda520 1380 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1da177e4 1381
10685a95
KJH		 1382 set_bit(chip->dev_num, dev_mask);
1383
6f9beccb 1384 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
90dda520 1385 chip->vendor.miscdev.name = devname;
1da177e4 1386
94fbcded 1387 chip->vendor.miscdev.parent = dev;
e659a3fe 1388 chip->dev = get_device(dev);
5bd91f18
RM		 1389 chip->release = dev->release;
1390 dev->release = tpm_dev_release;
1391 dev_set_drvdata(dev, chip);
1da177e4 1392
90dda520 1393 if (misc_register(&chip->vendor.miscdev)) {
e659a3fe 1394 dev_err(chip->dev,
1da177e4 1395 "unable to misc_register %s, minor %d\n",
90dda520
KJH		 1396 chip->vendor.miscdev.name,
1397 chip->vendor.miscdev.minor);
5bd91f18 1398 put_device(chip->dev);
e0dd03ca 1399 return NULL;
1da177e4
LT		 1400 }
1401
f33d9bd5 1402 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
5d469ec0 1403 misc_deregister(&chip->vendor.miscdev);
5bd91f18 1404 put_device(chip->dev);
f02a9364 1405
f33d9bd5
JG		 1406 return NULL;
1407 }
1da177e4 1408
55a82ab3
KJH		 1409 chip->bios_dir = tpm_bios_log_setup(devname);
1410
f02a9364
RA		 1411 /* Make chip available */
1412 spin_lock(&driver_lock);
1413 list_add_rcu(&chip->list, &tpm_chip_list);
1414 spin_unlock(&driver_lock);
1415
e0dd03ca 1416 return chip;
dd78c943
AM		 1417
1418out_free:
1419 kfree(chip);
1420 kfree(devname);
1421 return NULL;
1da177e4 1422}
1da177e4
LT		 1423EXPORT_SYMBOL_GPL(tpm_register_hardware);
1424
1da177e4
LT		 1425MODULE_AUTHOR("Leendert van Doorn ([email protected])");
1426MODULE_DESCRIPTION("TPM Driver");
1427MODULE_VERSION("2.0");
1428MODULE_LICENSE("GPL");
Empty description
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