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Documentation: sysfs for Physical Presence Interface
[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>
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
43#define TPM_MAX_PROTECTED_ORDINAL 12
44#define TPM_PROTECTED_ORDINAL_MASK 0xFF
45
9b3056cc
DT		 46/*
47 * Bug workaround - some TPM's don't flush the most
48 * recently changed pcr on suspend, so force the flush
49 * with an extend to the selected _unused_ non-volatile pcr.
50 */
51static int tpm_suspend_pcr;
52module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
53MODULE_PARM_DESC(suspend_pcr,
54 "PCR to use for dummy writes to faciltate flush on suspend.");
55
1da177e4
LT		 56static LIST_HEAD(tpm_chip_list);
57static DEFINE_SPINLOCK(driver_lock);
10685a95 58static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
1da177e4 59
9e18ee19
KJH		 60/*
61 * Array with one entry per ordinal defining the maximum amount
62 * of time the chip could take to return the result. The ordinal
63 * designation of short, medium or long is defined in a table in
64 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
65 * values of the SHORT, MEDIUM, and LONG durations are retrieved
66 * from the chip during initialization with a call to tpm_get_timeouts.
67 */
68static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
69 TPM_UNDEFINED, /* 0 */
70 TPM_UNDEFINED,
71 TPM_UNDEFINED,
72 TPM_UNDEFINED,
73 TPM_UNDEFINED,
74 TPM_UNDEFINED, /* 5 */
75 TPM_UNDEFINED,
76 TPM_UNDEFINED,
77 TPM_UNDEFINED,
78 TPM_UNDEFINED,
79 TPM_SHORT, /* 10 */
80 TPM_SHORT,
81};
82
83static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
84 TPM_UNDEFINED, /* 0 */
85 TPM_UNDEFINED,
86 TPM_UNDEFINED,
87 TPM_UNDEFINED,
88 TPM_UNDEFINED,
89 TPM_UNDEFINED, /* 5 */
90 TPM_UNDEFINED,
91 TPM_UNDEFINED,
92 TPM_UNDEFINED,
93 TPM_UNDEFINED,
94 TPM_SHORT, /* 10 */
95 TPM_SHORT,
96 TPM_MEDIUM,
97 TPM_LONG,
98 TPM_LONG,
99 TPM_MEDIUM, /* 15 */
100 TPM_SHORT,
101 TPM_SHORT,
102 TPM_MEDIUM,
103 TPM_LONG,
104 TPM_SHORT, /* 20 */
105 TPM_SHORT,
106 TPM_MEDIUM,
107 TPM_MEDIUM,
108 TPM_MEDIUM,
109 TPM_SHORT, /* 25 */
110 TPM_SHORT,
111 TPM_MEDIUM,
112 TPM_SHORT,
113 TPM_SHORT,
114 TPM_MEDIUM, /* 30 */
115 TPM_LONG,
116 TPM_MEDIUM,
117 TPM_SHORT,
118 TPM_SHORT,
119 TPM_SHORT, /* 35 */
120 TPM_MEDIUM,
121 TPM_MEDIUM,
122 TPM_UNDEFINED,
123 TPM_UNDEFINED,
124 TPM_MEDIUM, /* 40 */
125 TPM_LONG,
126 TPM_MEDIUM,
127 TPM_SHORT,
128 TPM_SHORT,
129 TPM_SHORT, /* 45 */
130 TPM_SHORT,
131 TPM_SHORT,
132 TPM_SHORT,
133 TPM_LONG,
134 TPM_MEDIUM, /* 50 */
135 TPM_MEDIUM,
136 TPM_UNDEFINED,
137 TPM_UNDEFINED,
138 TPM_UNDEFINED,
139 TPM_UNDEFINED, /* 55 */
140 TPM_UNDEFINED,
141 TPM_UNDEFINED,
142 TPM_UNDEFINED,
143 TPM_UNDEFINED,
144 TPM_MEDIUM, /* 60 */
145 TPM_MEDIUM,
146 TPM_MEDIUM,
147 TPM_SHORT,
148 TPM_SHORT,
149 TPM_MEDIUM, /* 65 */
150 TPM_UNDEFINED,
151 TPM_UNDEFINED,
152 TPM_UNDEFINED,
153 TPM_UNDEFINED,
154 TPM_SHORT, /* 70 */
155 TPM_SHORT,
156 TPM_UNDEFINED,
157 TPM_UNDEFINED,
158 TPM_UNDEFINED,
159 TPM_UNDEFINED, /* 75 */
160 TPM_UNDEFINED,
161 TPM_UNDEFINED,
162 TPM_UNDEFINED,
163 TPM_UNDEFINED,
164 TPM_LONG, /* 80 */
165 TPM_UNDEFINED,
166 TPM_MEDIUM,
167 TPM_LONG,
168 TPM_SHORT,
169 TPM_UNDEFINED, /* 85 */
170 TPM_UNDEFINED,
171 TPM_UNDEFINED,
172 TPM_UNDEFINED,
173 TPM_UNDEFINED,
174 TPM_SHORT, /* 90 */
175 TPM_SHORT,
176 TPM_SHORT,
177 TPM_SHORT,
178 TPM_SHORT,
179 TPM_UNDEFINED, /* 95 */
180 TPM_UNDEFINED,
181 TPM_UNDEFINED,
182 TPM_UNDEFINED,
183 TPM_UNDEFINED,
184 TPM_MEDIUM, /* 100 */
185 TPM_SHORT,
186 TPM_SHORT,
187 TPM_UNDEFINED,
188 TPM_UNDEFINED,
189 TPM_UNDEFINED, /* 105 */
190 TPM_UNDEFINED,
191 TPM_UNDEFINED,
192 TPM_UNDEFINED,
193 TPM_UNDEFINED,
194 TPM_SHORT, /* 110 */
195 TPM_SHORT,
196 TPM_SHORT,
197 TPM_SHORT,
198 TPM_SHORT,
199 TPM_SHORT, /* 115 */
200 TPM_SHORT,
201 TPM_SHORT,
202 TPM_UNDEFINED,
203 TPM_UNDEFINED,
204 TPM_LONG, /* 120 */
205 TPM_LONG,
206 TPM_MEDIUM,
207 TPM_UNDEFINED,
208 TPM_SHORT,
209 TPM_SHORT, /* 125 */
210 TPM_SHORT,
211 TPM_LONG,
212 TPM_SHORT,
213 TPM_SHORT,
214 TPM_SHORT, /* 130 */
215 TPM_MEDIUM,
216 TPM_UNDEFINED,
217 TPM_SHORT,
218 TPM_MEDIUM,
219 TPM_UNDEFINED, /* 135 */
220 TPM_UNDEFINED,
221 TPM_UNDEFINED,
222 TPM_UNDEFINED,
223 TPM_UNDEFINED,
224 TPM_SHORT, /* 140 */
225 TPM_SHORT,
226 TPM_UNDEFINED,
227 TPM_UNDEFINED,
228 TPM_UNDEFINED,
229 TPM_UNDEFINED, /* 145 */
230 TPM_UNDEFINED,
231 TPM_UNDEFINED,
232 TPM_UNDEFINED,
233 TPM_UNDEFINED,
234 TPM_SHORT, /* 150 */
235 TPM_MEDIUM,
236 TPM_MEDIUM,
237 TPM_SHORT,
238 TPM_SHORT,
239 TPM_UNDEFINED, /* 155 */
240 TPM_UNDEFINED,
241 TPM_UNDEFINED,
242 TPM_UNDEFINED,
243 TPM_UNDEFINED,
244 TPM_SHORT, /* 160 */
245 TPM_SHORT,
246 TPM_SHORT,
247 TPM_SHORT,
248 TPM_UNDEFINED,
249 TPM_UNDEFINED, /* 165 */
250 TPM_UNDEFINED,
251 TPM_UNDEFINED,
252 TPM_UNDEFINED,
253 TPM_UNDEFINED,
254 TPM_LONG, /* 170 */
255 TPM_UNDEFINED,
256 TPM_UNDEFINED,
257 TPM_UNDEFINED,
258 TPM_UNDEFINED,
259 TPM_UNDEFINED, /* 175 */
260 TPM_UNDEFINED,
261 TPM_UNDEFINED,
262 TPM_UNDEFINED,
263 TPM_UNDEFINED,
264 TPM_MEDIUM, /* 180 */
265 TPM_SHORT,
266 TPM_MEDIUM,
267 TPM_MEDIUM,
268 TPM_MEDIUM,
269 TPM_MEDIUM, /* 185 */
270 TPM_SHORT,
271 TPM_UNDEFINED,
272 TPM_UNDEFINED,
273 TPM_UNDEFINED,
274 TPM_UNDEFINED, /* 190 */
275 TPM_UNDEFINED,
276 TPM_UNDEFINED,
277 TPM_UNDEFINED,
278 TPM_UNDEFINED,
279 TPM_UNDEFINED, /* 195 */
280 TPM_UNDEFINED,
281 TPM_UNDEFINED,
282 TPM_UNDEFINED,
283 TPM_UNDEFINED,
284 TPM_SHORT, /* 200 */
285 TPM_UNDEFINED,
286 TPM_UNDEFINED,
287 TPM_UNDEFINED,
288 TPM_SHORT,
289 TPM_SHORT, /* 205 */
290 TPM_SHORT,
291 TPM_SHORT,
292 TPM_SHORT,
293 TPM_SHORT,
294 TPM_MEDIUM, /* 210 */
295 TPM_UNDEFINED,
296 TPM_MEDIUM,
297 TPM_MEDIUM,
298 TPM_MEDIUM,
299 TPM_UNDEFINED, /* 215 */
300 TPM_MEDIUM,
301 TPM_UNDEFINED,
302 TPM_UNDEFINED,
303 TPM_SHORT,
304 TPM_SHORT, /* 220 */
305 TPM_SHORT,
306 TPM_SHORT,
307 TPM_SHORT,
308 TPM_SHORT,
309 TPM_UNDEFINED, /* 225 */
310 TPM_UNDEFINED,
311 TPM_UNDEFINED,
312 TPM_UNDEFINED,
313 TPM_UNDEFINED,
314 TPM_SHORT, /* 230 */
315 TPM_LONG,
316 TPM_MEDIUM,
317 TPM_UNDEFINED,
318 TPM_UNDEFINED,
319 TPM_UNDEFINED, /* 235 */
320 TPM_UNDEFINED,
321 TPM_UNDEFINED,
322 TPM_UNDEFINED,
323 TPM_UNDEFINED,
324 TPM_SHORT, /* 240 */
325 TPM_UNDEFINED,
326 TPM_MEDIUM,
327};
328
1da177e4
LT		 329static void user_reader_timeout(unsigned long ptr)
330{
331 struct tpm_chip *chip = (struct tpm_chip *) ptr;
332
09e12f9f
KJH		 333 schedule_work(&chip->work);
334}
335
c4028958 336static void timeout_work(struct work_struct *work)
09e12f9f 337{
c4028958 338 struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
09e12f9f 339
d081d470 340 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 341 atomic_set(&chip->data_pending, 0);
342 memset(chip->data_buffer, 0, TPM_BUFSIZE);
d081d470 343 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 344}
345
9e18ee19
KJH		 346/*
347 * Returns max number of jiffies to wait
348 */
349unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
350 u32 ordinal)
351{
352 int duration_idx = TPM_UNDEFINED;
353 int duration = 0;
354
355 if (ordinal < TPM_MAX_ORDINAL)
356 duration_idx = tpm_ordinal_duration[ordinal];
357 else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
358 TPM_MAX_PROTECTED_ORDINAL)
359 duration_idx =
360 tpm_protected_ordinal_duration[ordinal &
361 TPM_PROTECTED_ORDINAL_MASK];
362
8d1dc20e 363 if (duration_idx != TPM_UNDEFINED)
36b20020 364 duration = chip->vendor.duration[duration_idx];
8d1dc20e 365 if (duration <= 0)
9e18ee19 366 return 2 * 60 * HZ;
8d1dc20e
LT		 367 else
368 return duration;
9e18ee19
KJH		 369}
370EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
371
1da177e4
LT		 372/*
373 * Internal kernel interface to transmit TPM commands
374 */
375static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
376 size_t bufsiz)
377{
d9e5b6bf 378 ssize_t rc;
9e18ee19 379 u32 count, ordinal;
700d8bdc 380 unsigned long stop;
1da177e4 381
6b07d30a
PH		 382 if (bufsiz > TPM_BUFSIZE)
383 bufsiz = TPM_BUFSIZE;
384
81179bb6 385 count = be32_to_cpu(*((__be32 *) (buf + 2)));
9e18ee19 386 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
1da177e4
LT		 387 if (count == 0)
388 return -ENODATA;
389 if (count > bufsiz) {
e659a3fe 390 dev_err(chip->dev,
b76be681 391 "invalid count value %x %zx \n", count, bufsiz);
1da177e4
LT		 392 return -E2BIG;
393 }
394
d081d470 395 mutex_lock(&chip->tpm_mutex);
1da177e4 396
90dda520 397 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
e659a3fe 398 dev_err(chip->dev,
d9e5b6bf
KH		 399 "tpm_transmit: tpm_send: error %zd\n", rc);
400 goto out;
1da177e4
LT		 401 }
402
27084efe
LD		 403 if (chip->vendor.irq)
404 goto out_recv;
405
9e18ee19 406 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
1da177e4 407 do {
90dda520
KJH		 408 u8 status = chip->vendor.status(chip);
409 if ((status & chip->vendor.req_complete_mask) ==
410 chip->vendor.req_complete_val)
1da177e4 411 goto out_recv;
d9e5b6bf 412
90dda520 413 if ((status == chip->vendor.req_canceled)) {
e659a3fe 414 dev_err(chip->dev, "Operation Canceled\n");
d9e5b6bf
KH		 415 rc = -ECANCELED;
416 goto out;
417 }
418
419 msleep(TPM_TIMEOUT); /* CHECK */
1da177e4 420 rmb();
700d8bdc 421 } while (time_before(jiffies, stop));
1da177e4 422
90dda520 423 chip->vendor.cancel(chip);
e659a3fe 424 dev_err(chip->dev, "Operation Timed out\n");
d9e5b6bf
KH		 425 rc = -ETIME;
426 goto out;
1da177e4
LT		 427
428out_recv:
90dda520 429 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
d9e5b6bf 430 if (rc < 0)
e659a3fe 431 dev_err(chip->dev,
d9e5b6bf
KH		 432 "tpm_transmit: tpm_recv: error %zd\n", rc);
433out:
d081d470 434 mutex_unlock(&chip->tpm_mutex);
d9e5b6bf 435 return rc;
1da177e4
LT		 436}
437
438#define TPM_DIGEST_SIZE 20
beed53a1 439#define TPM_RET_CODE_IDX 6
beed53a1
KJH		 440
441enum tpm_capabilities {
08837438
RA		 442 TPM_CAP_FLAG = cpu_to_be32(4),
443 TPM_CAP_PROP = cpu_to_be32(5),
444 CAP_VERSION_1_1 = cpu_to_be32(0x06),
445 CAP_VERSION_1_2 = cpu_to_be32(0x1A)
beed53a1
KJH		 446};
447
448enum tpm_sub_capabilities {
08837438
RA		 449 TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
450 TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
451 TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
452 TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
453 TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
454 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
455 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
beed53a1 456
1da177e4
LT		 457};
458
08837438
RA		 459static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
460 int len, const char *desc)
beed53a1
KJH		 461{
462 int err;
463
08837438 464 len = tpm_transmit(chip,(u8 *) cmd, len);
beed53a1
KJH		 465 if (len < 0)
466 return len;
b9e3238a
RA		 467 else if (len < TPM_HEADER_SIZE)
468 return -EFAULT;
469
470 err = be32_to_cpu(cmd->header.out.return_code);
471 if (err != 0)
472 dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
473
474 return err;
beed53a1
KJH		 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)
41ab999c 480#define TPM_ORD_GET_RANDOM cpu_to_be32(70)
08837438
RA		 481
482static const struct tpm_input_header tpm_getcap_header = {
483 .tag = TPM_TAG_RQU_COMMAND,
484 .length = cpu_to_be32(22),
485 .ordinal = TPM_ORD_GET_CAP
486};
487
488ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
489 const char *desc)
490{
491 struct tpm_cmd_t tpm_cmd;
492 int rc;
493 struct tpm_chip *chip = dev_get_drvdata(dev);
494
495 tpm_cmd.header.in = tpm_getcap_header;
496 if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
497 tpm_cmd.params.getcap_in.cap = subcap_id;
498 /*subcap field not necessary */
499 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
500 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
501 } else {
502 if (subcap_id == TPM_CAP_FLAG_PERM ||
503 subcap_id == TPM_CAP_FLAG_VOL)
504 tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
505 else
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 = subcap_id;
509 }
510 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
511 if (!rc)
512 *cap = tpm_cmd.params.getcap_out.cap;
513 return rc;
514}
515
08e96e48
KJH		 516void tpm_gen_interrupt(struct tpm_chip *chip)
517{
08837438 518 struct tpm_cmd_t tpm_cmd;
08e96e48
KJH		 519 ssize_t rc;
520
08837438
RA		 521 tpm_cmd.header.in = tpm_getcap_header;
522 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
523 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
524 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 525
08837438 526 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 527 "attempting to determine the timeouts");
528}
529EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
530
2b30a90f 531int tpm_get_timeouts(struct tpm_chip *chip)
08e96e48 532{
08837438
RA		 533 struct tpm_cmd_t tpm_cmd;
534 struct timeout_t *timeout_cap;
535 struct duration_t *duration_cap;
08e96e48
KJH		 536 ssize_t rc;
537 u32 timeout;
e3e1a1e1 538 unsigned int scale = 1;
08e96e48 539
08837438
RA		 540 tpm_cmd.header.in = tpm_getcap_header;
541 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
542 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
543 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 544
08837438 545 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 546 "attempting to determine the timeouts");
547 if (rc)
548 goto duration;
549
829bf067
SB		 550 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
551 be32_to_cpu(tpm_cmd.header.out.length)
552 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
2b30a90f 553 return -EINVAL;
08e96e48 554
08837438 555 timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
08e96e48 556 /* Don't overwrite default if value is 0 */
08837438 557 timeout = be32_to_cpu(timeout_cap->a);
e3e1a1e1
SB		 558 if (timeout && timeout < 1000) {
559 /* timeouts in msec rather usec */
560 scale = 1000;
62592101 561 chip->vendor.timeout_adjusted = true;
e3e1a1e1 562 }
08e96e48 563 if (timeout)
e3e1a1e1 564 chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
08837438 565 timeout = be32_to_cpu(timeout_cap->b);
08e96e48 566 if (timeout)
e3e1a1e1 567 chip->vendor.timeout_b = usecs_to_jiffies(timeout * scale);
08837438 568 timeout = be32_to_cpu(timeout_cap->c);
08e96e48 569 if (timeout)
e3e1a1e1 570 chip->vendor.timeout_c = usecs_to_jiffies(timeout * scale);
08837438 571 timeout = be32_to_cpu(timeout_cap->d);
08e96e48 572 if (timeout)
e3e1a1e1 573 chip->vendor.timeout_d = usecs_to_jiffies(timeout * scale);
08e96e48
KJH		 574
575duration:
08837438
RA		 576 tpm_cmd.header.in = tpm_getcap_header;
577 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
578 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
579 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
08e96e48 580
08837438 581 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 582 "attempting to determine the durations");
583 if (rc)
2b30a90f 584 return rc;
08e96e48 585
979b1406
SB		 586 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
587 be32_to_cpu(tpm_cmd.header.out.length)
588 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
2b30a90f 589 return -EINVAL;
979b1406 590
08837438 591 duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
08e96e48 592 chip->vendor.duration[TPM_SHORT] =
08837438 593 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
e934acca
SB		 594 chip->vendor.duration[TPM_MEDIUM] =
595 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
596 chip->vendor.duration[TPM_LONG] =
597 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
598
292cf4a8
VK		 599 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
600 * value wrong and apparently reports msecs rather than usecs. So we
601 * fix up the resulting too-small TPM_SHORT value to make things work.
e934acca 602 * We also scale the TPM_MEDIUM and -_LONG values by 1000.
292cf4a8 603 */
e934acca 604 if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
292cf4a8 605 chip->vendor.duration[TPM_SHORT] = HZ;
e934acca
SB		 606 chip->vendor.duration[TPM_MEDIUM] *= 1000;
607 chip->vendor.duration[TPM_LONG] *= 1000;
04ab2293 608 chip->vendor.duration_adjusted = true;
e934acca
SB		 609 dev_info(chip->dev, "Adjusting TPM timeout parameters.");
610 }
2b30a90f 611 return 0;
08e96e48
KJH		 612}
613EXPORT_SYMBOL_GPL(tpm_get_timeouts);
614
d97c6ade
SB		 615#define TPM_ORD_CONTINUE_SELFTEST 83
616#define CONTINUE_SELFTEST_RESULT_SIZE 10
617
618static struct tpm_input_header continue_selftest_header = {
619 .tag = TPM_TAG_RQU_COMMAND,
620 .length = cpu_to_be32(10),
621 .ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
622};
623
624/**
625 * tpm_continue_selftest -- run TPM's selftest
626 * @chip: TPM chip to use
627 *
628 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
629 * a TPM error code.
630 */
68d6e671 631static int tpm_continue_selftest(struct tpm_chip *chip)
08e96e48 632{
d97c6ade
SB		 633 int rc;
634 struct tpm_cmd_t cmd;
08e96e48 635
d97c6ade
SB		 636 cmd.header.in = continue_selftest_header;
637 rc = transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
638 "continue selftest");
639 return rc;
08e96e48 640}
08e96e48
KJH		 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
68d6e671 735static int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
659aaf2b
RA		 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
68d6e671
SB		 815/**
816 * tpm_do_selftest - have the TPM continue its selftest and wait until it
817 * can receive further commands
818 * @chip: TPM chip to use
819 *
820 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
821 * a TPM error code.
822 */
823int tpm_do_selftest(struct tpm_chip *chip)
824{
825 int rc;
68d6e671
SB		 826 unsigned int loops;
827 unsigned int delay_msec = 1000;
828 unsigned long duration;
24ebe667 829 struct tpm_cmd_t cmd;
68d6e671
SB		 830
831 duration = tpm_calc_ordinal_duration(chip,
832 TPM_ORD_CONTINUE_SELFTEST);
833
834 loops = jiffies_to_msecs(duration) / delay_msec;
835
836 rc = tpm_continue_selftest(chip);
837 /* This may fail if there was no TPM driver during a suspend/resume
838 * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST)
839 */
840 if (rc)
841 return rc;
842
843 do {
24ebe667
RA		 844 /* Attempt to read a PCR value */
845 cmd.header.in = pcrread_header;
846 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(0);
847 rc = tpm_transmit(chip, (u8 *) &cmd, READ_PCR_RESULT_SIZE);
848
849 if (rc < TPM_HEADER_SIZE)
850 return -EFAULT;
851
852 rc = be32_to_cpu(cmd.header.out.return_code);
be405411
SB		 853 if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
854 dev_info(chip->dev,
855 "TPM is disabled/deactivated (0x%X)\n", rc);
856 /* TPM is disabled and/or deactivated; driver can
857 * proceed and TPM does handle commands for
858 * suspend/resume correctly
859 */
860 return 0;
861 }
68d6e671
SB		 862 if (rc != TPM_WARN_DOING_SELFTEST)
863 return rc;
864 msleep(delay_msec);
865 } while (--loops > 0);
866
867 return rc;
868}
869EXPORT_SYMBOL_GPL(tpm_do_selftest);
870
c749ba91
MZ		 871int tpm_send(u32 chip_num, void *cmd, size_t buflen)
872{
873 struct tpm_chip *chip;
874 int rc;
875
876 chip = tpm_chip_find_get(chip_num);
877 if (chip == NULL)
878 return -ENODEV;
879
880 rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
881
882 tpm_chip_put(chip);
883 return rc;
884}
885EXPORT_SYMBOL_GPL(tpm_send);
886
6659ca2a
KH		 887ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
888 char *buf)
1da177e4 889{
08837438 890 cap_t cap;
659aaf2b 891 u8 digest[TPM_DIGEST_SIZE];
beed53a1 892 ssize_t rc;
81179bb6 893 int i, j, num_pcrs;
1da177e4 894 char *str = buf;
e659a3fe 895 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 896
08837438 897 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
beed53a1 898 "attempting to determine the number of PCRS");
08837438 899 if (rc)
e234bc97 900 return 0;
1da177e4 901
08837438 902 num_pcrs = be32_to_cpu(cap.num_pcrs);
1da177e4 903 for (i = 0; i < num_pcrs; i++) {
659aaf2b 904 rc = __tpm_pcr_read(chip, i, digest);
beed53a1 905 if (rc)
08837438 906 break;
1da177e4
LT		 907 str += sprintf(str, "PCR-%02d: ", i);
908 for (j = 0; j < TPM_DIGEST_SIZE; j++)
659aaf2b 909 str += sprintf(str, "%02X ", digest[j]);
1da177e4
LT		 910 str += sprintf(str, "\n");
911 }
912 return str - buf;
913}
6659ca2a 914EXPORT_SYMBOL_GPL(tpm_show_pcrs);
1da177e4
LT		 915
916#define READ_PUBEK_RESULT_SIZE 314
08837438
RA		 917#define TPM_ORD_READPUBEK cpu_to_be32(124)
918struct tpm_input_header tpm_readpubek_header = {
919 .tag = TPM_TAG_RQU_COMMAND,
920 .length = cpu_to_be32(30),
921 .ordinal = TPM_ORD_READPUBEK
1da177e4
LT		 922};
923
6659ca2a
KH		 924ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
925 char *buf)
1da177e4 926{
2df7111f 927 u8 *data;
08837438 928 struct tpm_cmd_t tpm_cmd;
beed53a1 929 ssize_t err;
81179bb6 930 int i, rc;
1da177e4
LT		 931 char *str = buf;
932
e659a3fe 933 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 934
08837438
RA		 935 tpm_cmd.header.in = tpm_readpubek_header;
936 err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
beed53a1
KJH		 937 "attempting to read the PUBEK");
938 if (err)
34d6e075 939 goto out;
1da177e4
LT		 940
941 /*
942 ignore header 10 bytes
943 algorithm 32 bits (1 == RSA )
944 encscheme 16 bits
945 sigscheme 16 bits
946 parameters (RSA 12->bytes: keybit, #primes, expbit)
947 keylenbytes 32 bits
948 256 byte modulus
949 ignore checksum 20 bytes
950 */
08837438 951 data = tpm_cmd.params.readpubek_out_buffer;
1da177e4
LT		 952 str +=
953 sprintf(str,
5a79444f
SB		 954 "Algorithm: %02X %02X %02X %02X\n"
955 "Encscheme: %02X %02X\n"
956 "Sigscheme: %02X %02X\n"
957 "Parameters: %02X %02X %02X %02X "
958 "%02X %02X %02X %02X "
959 "%02X %02X %02X %02X\n"
960 "Modulus length: %d\n"
961 "Modulus:\n",
962 data[0], data[1], data[2], data[3],
963 data[4], data[5],
964 data[6], data[7],
965 data[12], data[13], data[14], data[15],
966 data[16], data[17], data[18], data[19],
967 data[20], data[21], data[22], data[23],
968 be32_to_cpu(*((__be32 *) (data + 24))));
1da177e4
LT		 969
970 for (i = 0; i < 256; i++) {
5a79444f 971 str += sprintf(str, "%02X ", data[i + 28]);
1da177e4
LT		 972 if ((i + 1) % 16 == 0)
973 str += sprintf(str, "\n");
974 }
34d6e075 975out:
beed53a1 976 rc = str - buf;
2df7111f 977 return rc;
1da177e4 978}
6659ca2a 979EXPORT_SYMBOL_GPL(tpm_show_pubek);
1da177e4 980
1da177e4 981
6659ca2a
KH		 982ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
983 char *buf)
1da177e4 984{
08837438 985 cap_t cap;
beed53a1 986 ssize_t rc;
1da177e4
LT		 987 char *str = buf;
988
08837438 989 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
beed53a1 990 "attempting to determine the manufacturer");
08837438 991 if (rc)
beed53a1 992 return 0;
1da177e4 993 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438 994 be32_to_cpu(cap.manufacturer_id));
1da177e4 995
08837438
RA		 996 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
997 "attempting to determine the 1.1 version");
beed53a1 998 if (rc)
08837438 999 return 0;
beed53a1
KJH		 1000 str += sprintf(str,
1001 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 1002 cap.tpm_version.Major, cap.tpm_version.Minor,
1003 cap.tpm_version.revMajor, cap.tpm_version.revMinor);
1da177e4
LT		 1004 return str - buf;
1005}
6659ca2a
KH		 1006EXPORT_SYMBOL_GPL(tpm_show_caps);
1007
08e96e48
KJH		 1008ssize_t tpm_show_caps_1_2(struct device * dev,
1009 struct device_attribute * attr, char *buf)
1010{
08837438
RA		 1011 cap_t cap;
1012 ssize_t rc;
08e96e48
KJH		 1013 char *str = buf;
1014
08837438
RA		 1015 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
1016 "attempting to determine the manufacturer");
1017 if (rc)
08e96e48 1018 return 0;
08e96e48 1019 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438
RA		 1020 be32_to_cpu(cap.manufacturer_id));
1021 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
1022 "attempting to determine the 1.2 version");
1023 if (rc)
1024 return 0;
08e96e48
KJH		 1025 str += sprintf(str,
1026 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 1027 cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
1028 cap.tpm_version_1_2.revMajor,
1029 cap.tpm_version_1_2.revMinor);
08e96e48
KJH		 1030 return str - buf;
1031}
1032EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
1033
04ab2293
SB		 1034ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
1035 char *buf)
1036{
1037 struct tpm_chip *chip = dev_get_drvdata(dev);
1038
403d1d03
SB		 1039 if (chip->vendor.duration[TPM_LONG] == 0)
1040 return 0;
1041
04ab2293
SB		 1042 return sprintf(buf, "%d %d %d [%s]\n",
1043 jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
1044 jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
1045 jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
1046 chip->vendor.duration_adjusted
1047 ? "adjusted" : "original");
1048}
1049EXPORT_SYMBOL_GPL(tpm_show_durations);
1050
62592101
SB		 1051ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
1052 char *buf)
1053{
1054 struct tpm_chip *chip = dev_get_drvdata(dev);
1055
1056 return sprintf(buf, "%d %d %d %d [%s]\n",
1057 jiffies_to_usecs(chip->vendor.timeout_a),
1058 jiffies_to_usecs(chip->vendor.timeout_b),
1059 jiffies_to_usecs(chip->vendor.timeout_c),
1060 jiffies_to_usecs(chip->vendor.timeout_d),
1061 chip->vendor.timeout_adjusted
1062 ? "adjusted" : "original");
1063}
1064EXPORT_SYMBOL_GPL(tpm_show_timeouts);
1065
6659ca2a
KH		 1066ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
1067 const char *buf, size_t count)
1068{
1069 struct tpm_chip *chip = dev_get_drvdata(dev);
1070 if (chip == NULL)
1071 return 0;
1072
90dda520 1073 chip->vendor.cancel(chip);
6659ca2a
KH		 1074 return count;
1075}
1076EXPORT_SYMBOL_GPL(tpm_store_cancel);
1da177e4 1077
fd048866
RA		 1078int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
1079 wait_queue_head_t *queue)
1080{
1081 unsigned long stop;
1082 long rc;
1083 u8 status;
1084
1085 /* check current status */
1086 status = chip->vendor.status(chip);
1087 if ((status & mask) == mask)
1088 return 0;
1089
1090 stop = jiffies + timeout;
1091
1092 if (chip->vendor.irq) {
1093again:
1094 timeout = stop - jiffies;
1095 if ((long)timeout <= 0)
1096 return -ETIME;
1097 rc = wait_event_interruptible_timeout(*queue,
1098 ((chip->vendor.status(chip)
1099 & mask) == mask),
1100 timeout);
1101 if (rc > 0)
1102 return 0;
1103 if (rc == -ERESTARTSYS && freezing(current)) {
1104 clear_thread_flag(TIF_SIGPENDING);
1105 goto again;
1106 }
1107 } else {
1108 do {
1109 msleep(TPM_TIMEOUT);
1110 status = chip->vendor.status(chip);
1111 if ((status & mask) == mask)
1112 return 0;
1113 } while (time_before(jiffies, stop));
1114 }
1115 return -ETIME;
1116}
1117EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
1da177e4
LT		 1118/*
1119 * Device file system interface to the TPM
f89c5edb
RA		 1120 *
1121 * It's assured that the chip will be opened just once,
1122 * by the check of is_open variable, which is protected
1123 * by driver_lock.
1da177e4
LT		 1124 */
1125int tpm_open(struct inode *inode, struct file *file)
1126{
f02a9364 1127 int minor = iminor(inode);
1da177e4
LT		 1128 struct tpm_chip *chip = NULL, *pos;
1129
f02a9364
RA		 1130 rcu_read_lock();
1131 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
90dda520 1132 if (pos->vendor.miscdev.minor == minor) {
1da177e4 1133 chip = pos;
f02a9364 1134 get_device(chip->dev);
1da177e4
LT		 1135 break;
1136 }
1137 }
f02a9364 1138 rcu_read_unlock();
1da177e4 1139
f02a9364
RA		 1140 if (!chip)
1141 return -ENODEV;
1da177e4 1142
dc36d32c 1143 if (test_and_set_bit(0, &chip->is_open)) {
b888c87b 1144 dev_dbg(chip->dev, "Another process owns this TPM\n");
f02a9364
RA		 1145 put_device(chip->dev);
1146 return -EBUSY;
1da177e4
LT		 1147 }
1148
1309d7af 1149 chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
1da177e4 1150 if (chip->data_buffer == NULL) {
dc36d32c 1151 clear_bit(0, &chip->is_open);
e659a3fe 1152 put_device(chip->dev);
1da177e4
LT		 1153 return -ENOMEM;
1154 }
1155
1156 atomic_set(&chip->data_pending, 0);
1157
1158 file->private_data = chip;
1159 return 0;
1da177e4 1160}
1da177e4
LT		 1161EXPORT_SYMBOL_GPL(tpm_open);
1162
f02a9364
RA		 1163/*
1164 * Called on file close
1165 */
1da177e4
LT		 1166int tpm_release(struct inode *inode, struct file *file)
1167{
1168 struct tpm_chip *chip = file->private_data;
1da177e4 1169
4bdec11f 1170 del_singleshot_timer_sync(&chip->user_read_timer);
2e5c44c9 1171 flush_work_sync(&chip->work);
5e976d55 1172 file->private_data = NULL;
1da177e4 1173 atomic_set(&chip->data_pending, 0);
dd7da132 1174 kzfree(chip->data_buffer);
dc36d32c 1175 clear_bit(0, &chip->is_open);
e659a3fe 1176 put_device(chip->dev);
1da177e4
LT		 1177 return 0;
1178}
1da177e4
LT		 1179EXPORT_SYMBOL_GPL(tpm_release);
1180
b888c87b 1181ssize_t tpm_write(struct file *file, const char __user *buf,
3c2f606a 1182 size_t size, loff_t *off)
1da177e4
LT		 1183{
1184 struct tpm_chip *chip = file->private_data;
01476001 1185 size_t in_size = size, out_size;
1da177e4
LT		 1186
1187 /* cannot perform a write until the read has cleared
1188 either via tpm_read or a user_read_timer timeout */
700d8bdc
NA		 1189 while (atomic_read(&chip->data_pending) != 0)
1190 msleep(TPM_TIMEOUT);
1da177e4 1191
d081d470 1192 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 1193
1194 if (in_size > TPM_BUFSIZE)
1195 in_size = TPM_BUFSIZE;
1196
1197 if (copy_from_user
1198 (chip->data_buffer, (void __user *) buf, in_size)) {
d081d470 1199 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1200 return -EFAULT;
1201 }
1202
1203 /* atomic tpm command send and result receive */
1204 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1205
1206 atomic_set(&chip->data_pending, out_size);
d081d470 1207 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1208
1209 /* Set a timeout by which the reader must come claim the result */
fe3fd483 1210 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1da177e4
LT		 1211
1212 return in_size;
1213}
1da177e4
LT		 1214EXPORT_SYMBOL_GPL(tpm_write);
1215
3c2f606a
KJH		 1216ssize_t tpm_read(struct file *file, char __user *buf,
1217 size_t size, loff_t *off)
1da177e4
LT		 1218{
1219 struct tpm_chip *chip = file->private_data;
01476001 1220 ssize_t ret_size;
3321c07a 1221 int rc;
1da177e4 1222
5b44bd58 1223 del_singleshot_timer_sync(&chip->user_read_timer);
2e5c44c9 1224 flush_work_sync(&chip->work);
5b44bd58 1225 ret_size = atomic_read(&chip->data_pending);
5b44bd58 1226 if (ret_size > 0) { /* relay data */
3ab1aff8 1227 ssize_t orig_ret_size = ret_size;
5b44bd58
KH		 1228 if (size < ret_size)
1229 ret_size = size;
1da177e4 1230
d081d470 1231 mutex_lock(&chip->buffer_mutex);
3321c07a 1232 rc = copy_to_user(buf, chip->data_buffer, ret_size);
3ab1aff8 1233 memset(chip->data_buffer, 0, orig_ret_size);
3321c07a 1234 if (rc)
5b44bd58 1235 ret_size = -EFAULT;
3321c07a 1236
d081d470 1237 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1238 }
1239
dd7da132
KY		 1240 atomic_set(&chip->data_pending, 0);
1241
1da177e4
LT		 1242 return ret_size;
1243}
1da177e4
LT		 1244EXPORT_SYMBOL_GPL(tpm_read);
1245
e659a3fe 1246void tpm_remove_hardware(struct device *dev)
1da177e4 1247{
e659a3fe 1248 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1249
1250 if (chip == NULL) {
e659a3fe 1251 dev_err(dev, "No device data found\n");
1da177e4
LT		 1252 return;
1253 }
1254
1255 spin_lock(&driver_lock);
f02a9364 1256 list_del_rcu(&chip->list);
1da177e4 1257 spin_unlock(&driver_lock);
f02a9364 1258 synchronize_rcu();
1da177e4 1259
90dda520 1260 misc_deregister(&chip->vendor.miscdev);
90dda520 1261 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
55a82ab3 1262 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1263
5bd91f18
RM		 1264 /* write it this way to be explicit (chip->dev == dev) */
1265 put_device(chip->dev);
1da177e4 1266}
e659a3fe 1267EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4 1268
225a9be2
RA		 1269#define TPM_ORD_SAVESTATE cpu_to_be32(152)
1270#define SAVESTATE_RESULT_SIZE 10
1271
1272static struct tpm_input_header savestate_header = {
1273 .tag = TPM_TAG_RQU_COMMAND,
1274 .length = cpu_to_be32(10),
1275 .ordinal = TPM_ORD_SAVESTATE
1276};
1277
1da177e4
LT		 1278/*
1279 * We are about to suspend. Save the TPM state
1280 * so that it can be restored.
1281 */
035e2ce8 1282int tpm_pm_suspend(struct device *dev)
1da177e4 1283{
ce2c87d4 1284 struct tpm_chip *chip = dev_get_drvdata(dev);
225a9be2
RA		 1285 struct tpm_cmd_t cmd;
1286 int rc;
1287
1288 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
2490c681 1289
1da177e4
LT		 1290 if (chip == NULL)
1291 return -ENODEV;
1292
225a9be2
RA		 1293 /* for buggy tpm, flush pcrs with extend to selected dummy */
1294 if (tpm_suspend_pcr) {
1295 cmd.header.in = pcrextend_header;
1296 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1297 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1298 TPM_DIGEST_SIZE);
1299 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1300 "extending dummy pcr before suspend");
1301 }
1302
1303 /* now do the actual savestate */
1304 cmd.header.in = savestate_header;
1305 rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
1306 "sending savestate before suspend");
1307 return rc;
1da177e4 1308}
1da177e4
LT		 1309EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1310
1311/*
1312 * Resume from a power safe. The BIOS already restored
1313 * the TPM state.
1314 */
ce2c87d4 1315int tpm_pm_resume(struct device *dev)
1da177e4 1316{
ce2c87d4 1317 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1318
1319 if (chip == NULL)
1320 return -ENODEV;
1321
1da177e4
LT		 1322 return 0;
1323}
1da177e4
LT		 1324EXPORT_SYMBOL_GPL(tpm_pm_resume);
1325
41ab999c
KY		 1326#define TPM_GETRANDOM_RESULT_SIZE 18
1327static struct tpm_input_header tpm_getrandom_header = {
1328 .tag = TPM_TAG_RQU_COMMAND,
1329 .length = cpu_to_be32(14),
1330 .ordinal = TPM_ORD_GET_RANDOM
1331};
1332
1333/**
1334 * tpm_get_random() - Get random bytes from the tpm's RNG
1335 * @chip_num: A specific chip number for the request or TPM_ANY_NUM
1336 * @out: destination buffer for the random bytes
1337 * @max: the max number of bytes to write to @out
1338 *
1339 * Returns < 0 on error and the number of bytes read on success
1340 */
1341int tpm_get_random(u32 chip_num, u8 *out, size_t max)
1342{
1343 struct tpm_chip *chip;
1344 struct tpm_cmd_t tpm_cmd;
1345 u32 recd, num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA);
1346 int err, total = 0, retries = 5;
1347 u8 *dest = out;
1348
1349 chip = tpm_chip_find_get(chip_num);
1350 if (chip == NULL)
1351 return -ENODEV;
1352
1353 if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
1354 return -EINVAL;
1355
1356 do {
1357 tpm_cmd.header.in = tpm_getrandom_header;
1358 tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
1359
1360 err = transmit_cmd(chip, &tpm_cmd,
1361 TPM_GETRANDOM_RESULT_SIZE + num_bytes,
1362 "attempting get random");
1363 if (err)
1364 break;
1365
1366 recd = be32_to_cpu(tpm_cmd.params.getrandom_out.rng_data_len);
1367 memcpy(dest, tpm_cmd.params.getrandom_out.rng_data, recd);
1368
1369 dest += recd;
1370 total += recd;
1371 num_bytes -= recd;
1372 } while (retries-- && total < max);
1373
1374 return total ? total : -EIO;
1375}
1376EXPORT_SYMBOL_GPL(tpm_get_random);
1377
253115b7
RA		 1378/* In case vendor provided release function, call it too.*/
1379
1380void tpm_dev_vendor_release(struct tpm_chip *chip)
1381{
3072928f
AS		 1382 if (!chip)
1383 return;
1384
253115b7
RA		 1385 if (chip->vendor.release)
1386 chip->vendor.release(chip->dev);
1387
1388 clear_bit(chip->dev_num, dev_mask);
1389 kfree(chip->vendor.miscdev.name);
1390}
1391EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1392
1393
5bd91f18
RM		 1394/*
1395 * Once all references to platform device are down to 0,
1396 * release all allocated structures.
5bd91f18 1397 */
cbb2ed4a 1398void tpm_dev_release(struct device *dev)
5bd91f18
RM		 1399{
1400 struct tpm_chip *chip = dev_get_drvdata(dev);
1401
3072928f
AS		 1402 if (!chip)
1403 return;
1404
253115b7 1405 tpm_dev_vendor_release(chip);
5bd91f18 1406
253115b7 1407 chip->release(dev);
5bd91f18
RM		 1408 kfree(chip);
1409}
253115b7 1410EXPORT_SYMBOL_GPL(tpm_dev_release);
5bd91f18 1411
1da177e4
LT		 1412/*
1413 * Called from tpm_<specific>.c probe function only for devices
1414 * the driver has determined it should claim. Prior to calling
1415 * this function the specific probe function has called pci_enable_device
1416 * upon errant exit from this function specific probe function should call
1417 * pci_disable_device
1418 */
f02a9364
RA		 1419struct tpm_chip *tpm_register_hardware(struct device *dev,
1420 const struct tpm_vendor_specific *entry)
1da177e4 1421{
6f9beccb
KJH		 1422#define DEVNAME_SIZE 7
1423
1424 char *devname;
1da177e4 1425 struct tpm_chip *chip;
1da177e4
LT		 1426
1427 /* Driver specific per-device data */
b888c87b 1428 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
8e39c933
PW		 1429 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1430
dd78c943
AM		 1431 if (chip == NULL || devname == NULL)
1432 goto out_free;
1da177e4 1433
d081d470
MK		 1434 mutex_init(&chip->buffer_mutex);
1435 mutex_init(&chip->tpm_mutex);
1da177e4
LT		 1436 INIT_LIST_HEAD(&chip->list);
1437
c4028958 1438 INIT_WORK(&chip->work, timeout_work);
09e12f9f 1439
40565f19
JS		 1440 setup_timer(&chip->user_read_timer, user_reader_timeout,
1441 (unsigned long)chip);
fe3fd483 1442
90dda520 1443 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4 1444
10685a95 1445 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1da177e4 1446
10685a95 1447 if (chip->dev_num >= TPM_NUM_DEVICES) {
b888c87b 1448 dev_err(dev, "No available tpm device numbers\n");
dd78c943 1449 goto out_free;
1da177e4 1450 } else if (chip->dev_num == 0)
90dda520 1451 chip->vendor.miscdev.minor = TPM_MINOR;
1da177e4 1452 else
90dda520 1453 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1da177e4 1454
10685a95
KJH		 1455 set_bit(chip->dev_num, dev_mask);
1456
6f9beccb 1457 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
90dda520 1458 chip->vendor.miscdev.name = devname;
1da177e4 1459
94fbcded 1460 chip->vendor.miscdev.parent = dev;
e659a3fe 1461 chip->dev = get_device(dev);
5bd91f18
RM		 1462 chip->release = dev->release;
1463 dev->release = tpm_dev_release;
1464 dev_set_drvdata(dev, chip);
1da177e4 1465
90dda520 1466 if (misc_register(&chip->vendor.miscdev)) {
e659a3fe 1467 dev_err(chip->dev,
1da177e4 1468 "unable to misc_register %s, minor %d\n",
90dda520
KJH		 1469 chip->vendor.miscdev.name,
1470 chip->vendor.miscdev.minor);
dad79cb8 1471 goto put_device;
1da177e4
LT		 1472 }
1473
f33d9bd5 1474 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
5d469ec0 1475 misc_deregister(&chip->vendor.miscdev);
dad79cb8 1476 goto put_device;
f33d9bd5 1477 }
1da177e4 1478
55a82ab3
KJH		 1479 chip->bios_dir = tpm_bios_log_setup(devname);
1480
f02a9364
RA		 1481 /* Make chip available */
1482 spin_lock(&driver_lock);
1483 list_add_rcu(&chip->list, &tpm_chip_list);
1484 spin_unlock(&driver_lock);
1485
e0dd03ca 1486 return chip;
dd78c943 1487
dad79cb8
WG		 1488put_device:
1489 put_device(chip->dev);
dd78c943
AM		 1490out_free:
1491 kfree(chip);
1492 kfree(devname);
1493 return NULL;
1da177e4 1494}
1da177e4
LT		 1495EXPORT_SYMBOL_GPL(tpm_register_hardware);
1496
1da177e4
LT		 1497MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1498MODULE_DESCRIPTION("TPM Driver");
1499MODULE_VERSION("2.0");
1500MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)