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TPM: NSC and TIS drivers X86 dependency fix
[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
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
81179bb6 387 count = be32_to_cpu(*((__be32 *) (buf + 2)));
9e18ee19 388 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
1da177e4
LT		 389 if (count == 0)
390 return -ENODATA;
391 if (count > bufsiz) {
e659a3fe 392 dev_err(chip->dev,
b76be681 393 "invalid count value %x %zx \n", count, bufsiz);
1da177e4
LT		 394 return -E2BIG;
395 }
396
d081d470 397 mutex_lock(&chip->tpm_mutex);
1da177e4 398
90dda520 399 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
e659a3fe 400 dev_err(chip->dev,
d9e5b6bf
KH		 401 "tpm_transmit: tpm_send: error %zd\n", rc);
402 goto out;
1da177e4
LT		 403 }
404
27084efe
LD		 405 if (chip->vendor.irq)
406 goto out_recv;
407
9e18ee19 408 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
1da177e4 409 do {
90dda520
KJH		 410 u8 status = chip->vendor.status(chip);
411 if ((status & chip->vendor.req_complete_mask) ==
412 chip->vendor.req_complete_val)
1da177e4 413 goto out_recv;
d9e5b6bf 414
90dda520 415 if ((status == chip->vendor.req_canceled)) {
e659a3fe 416 dev_err(chip->dev, "Operation Canceled\n");
d9e5b6bf
KH		 417 rc = -ECANCELED;
418 goto out;
419 }
420
421 msleep(TPM_TIMEOUT); /* CHECK */
1da177e4 422 rmb();
700d8bdc 423 } while (time_before(jiffies, stop));
1da177e4 424
90dda520 425 chip->vendor.cancel(chip);
e659a3fe 426 dev_err(chip->dev, "Operation Timed out\n");
d9e5b6bf
KH		 427 rc = -ETIME;
428 goto out;
1da177e4
LT		 429
430out_recv:
90dda520 431 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
d9e5b6bf 432 if (rc < 0)
e659a3fe 433 dev_err(chip->dev,
d9e5b6bf
KH		 434 "tpm_transmit: tpm_recv: error %zd\n", rc);
435out:
d081d470 436 mutex_unlock(&chip->tpm_mutex);
d9e5b6bf 437 return rc;
1da177e4
LT		 438}
439
440#define TPM_DIGEST_SIZE 20
beed53a1
KJH		 441#define TPM_ERROR_SIZE 10
442#define TPM_RET_CODE_IDX 6
beed53a1
KJH		 443
444enum tpm_capabilities {
08837438
RA		 445 TPM_CAP_FLAG = cpu_to_be32(4),
446 TPM_CAP_PROP = cpu_to_be32(5),
447 CAP_VERSION_1_1 = cpu_to_be32(0x06),
448 CAP_VERSION_1_2 = cpu_to_be32(0x1A)
beed53a1
KJH		 449};
450
451enum tpm_sub_capabilities {
08837438
RA		 452 TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
453 TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
454 TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
455 TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
456 TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
457 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
458 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
beed53a1 459
1da177e4
LT		 460};
461
08837438
RA		 462static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
463 int len, const char *desc)
beed53a1
KJH		 464{
465 int err;
466
08837438 467 len = tpm_transmit(chip,(u8 *) cmd, len);
beed53a1
KJH		 468 if (len < 0)
469 return len;
470 if (len == TPM_ERROR_SIZE) {
08837438 471 err = be32_to_cpu(cmd->header.out.return_code);
beed53a1
KJH		 472 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
473 return err;
474 }
475 return 0;
476}
477
08837438
RA		 478#define TPM_INTERNAL_RESULT_SIZE 200
479#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
480#define TPM_ORD_GET_CAP cpu_to_be32(101)
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;
826 u8 digest[TPM_DIGEST_SIZE];
827 unsigned int loops;
828 unsigned int delay_msec = 1000;
829 unsigned long duration;
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 {
844 rc = __tpm_pcr_read(chip, 0, digest);
845 if (rc != TPM_WARN_DOING_SELFTEST)
846 return rc;
847 msleep(delay_msec);
848 } while (--loops > 0);
849
850 return rc;
851}
852EXPORT_SYMBOL_GPL(tpm_do_selftest);
853
c749ba91
MZ		 854int tpm_send(u32 chip_num, void *cmd, size_t buflen)
855{
856 struct tpm_chip *chip;
857 int rc;
858
859 chip = tpm_chip_find_get(chip_num);
860 if (chip == NULL)
861 return -ENODEV;
862
863 rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
864
865 tpm_chip_put(chip);
866 return rc;
867}
868EXPORT_SYMBOL_GPL(tpm_send);
869
6659ca2a
KH		 870ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
871 char *buf)
1da177e4 872{
08837438 873 cap_t cap;
659aaf2b 874 u8 digest[TPM_DIGEST_SIZE];
beed53a1 875 ssize_t rc;
81179bb6 876 int i, j, num_pcrs;
1da177e4 877 char *str = buf;
e659a3fe 878 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 879
08837438 880 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
beed53a1 881 "attempting to determine the number of PCRS");
08837438 882 if (rc)
e234bc97 883 return 0;
1da177e4 884
08837438 885 num_pcrs = be32_to_cpu(cap.num_pcrs);
1da177e4 886 for (i = 0; i < num_pcrs; i++) {
659aaf2b 887 rc = __tpm_pcr_read(chip, i, digest);
beed53a1 888 if (rc)
08837438 889 break;
1da177e4
LT		 890 str += sprintf(str, "PCR-%02d: ", i);
891 for (j = 0; j < TPM_DIGEST_SIZE; j++)
659aaf2b 892 str += sprintf(str, "%02X ", digest[j]);
1da177e4
LT		 893 str += sprintf(str, "\n");
894 }
895 return str - buf;
896}
6659ca2a 897EXPORT_SYMBOL_GPL(tpm_show_pcrs);
1da177e4
LT		 898
899#define READ_PUBEK_RESULT_SIZE 314
08837438
RA		 900#define TPM_ORD_READPUBEK cpu_to_be32(124)
901struct tpm_input_header tpm_readpubek_header = {
902 .tag = TPM_TAG_RQU_COMMAND,
903 .length = cpu_to_be32(30),
904 .ordinal = TPM_ORD_READPUBEK
1da177e4
LT		 905};
906
6659ca2a
KH		 907ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
908 char *buf)
1da177e4 909{
2df7111f 910 u8 *data;
08837438 911 struct tpm_cmd_t tpm_cmd;
beed53a1 912 ssize_t err;
81179bb6 913 int i, rc;
1da177e4
LT		 914 char *str = buf;
915
e659a3fe 916 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 917
08837438
RA		 918 tpm_cmd.header.in = tpm_readpubek_header;
919 err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
beed53a1
KJH		 920 "attempting to read the PUBEK");
921 if (err)
34d6e075 922 goto out;
1da177e4
LT		 923
924 /*
925 ignore header 10 bytes
926 algorithm 32 bits (1 == RSA )
927 encscheme 16 bits
928 sigscheme 16 bits
929 parameters (RSA 12->bytes: keybit, #primes, expbit)
930 keylenbytes 32 bits
931 256 byte modulus
932 ignore checksum 20 bytes
933 */
08837438 934 data = tpm_cmd.params.readpubek_out_buffer;
1da177e4
LT		 935 str +=
936 sprintf(str,
5a79444f
SB		 937 "Algorithm: %02X %02X %02X %02X\n"
938 "Encscheme: %02X %02X\n"
939 "Sigscheme: %02X %02X\n"
940 "Parameters: %02X %02X %02X %02X "
941 "%02X %02X %02X %02X "
942 "%02X %02X %02X %02X\n"
943 "Modulus length: %d\n"
944 "Modulus:\n",
945 data[0], data[1], data[2], data[3],
946 data[4], data[5],
947 data[6], data[7],
948 data[12], data[13], data[14], data[15],
949 data[16], data[17], data[18], data[19],
950 data[20], data[21], data[22], data[23],
951 be32_to_cpu(*((__be32 *) (data + 24))));
1da177e4
LT		 952
953 for (i = 0; i < 256; i++) {
5a79444f 954 str += sprintf(str, "%02X ", data[i + 28]);
1da177e4
LT		 955 if ((i + 1) % 16 == 0)
956 str += sprintf(str, "\n");
957 }
34d6e075 958out:
beed53a1 959 rc = str - buf;
2df7111f 960 return rc;
1da177e4 961}
6659ca2a 962EXPORT_SYMBOL_GPL(tpm_show_pubek);
1da177e4 963
1da177e4 964
6659ca2a
KH		 965ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
966 char *buf)
1da177e4 967{
08837438 968 cap_t cap;
beed53a1 969 ssize_t rc;
1da177e4
LT		 970 char *str = buf;
971
08837438 972 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
beed53a1 973 "attempting to determine the manufacturer");
08837438 974 if (rc)
beed53a1 975 return 0;
1da177e4 976 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438 977 be32_to_cpu(cap.manufacturer_id));
1da177e4 978
08837438
RA		 979 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
980 "attempting to determine the 1.1 version");
beed53a1 981 if (rc)
08837438 982 return 0;
beed53a1
KJH		 983 str += sprintf(str,
984 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 985 cap.tpm_version.Major, cap.tpm_version.Minor,
986 cap.tpm_version.revMajor, cap.tpm_version.revMinor);
1da177e4
LT		 987 return str - buf;
988}
6659ca2a
KH		 989EXPORT_SYMBOL_GPL(tpm_show_caps);
990
08e96e48
KJH		 991ssize_t tpm_show_caps_1_2(struct device * dev,
992 struct device_attribute * attr, char *buf)
993{
08837438
RA		 994 cap_t cap;
995 ssize_t rc;
08e96e48
KJH		 996 char *str = buf;
997
08837438
RA		 998 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
999 "attempting to determine the manufacturer");
1000 if (rc)
08e96e48 1001 return 0;
08e96e48 1002 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438
RA		 1003 be32_to_cpu(cap.manufacturer_id));
1004 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
1005 "attempting to determine the 1.2 version");
1006 if (rc)
1007 return 0;
08e96e48
KJH		 1008 str += sprintf(str,
1009 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 1010 cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
1011 cap.tpm_version_1_2.revMajor,
1012 cap.tpm_version_1_2.revMinor);
08e96e48
KJH		 1013 return str - buf;
1014}
1015EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
1016
04ab2293
SB		 1017ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
1018 char *buf)
1019{
1020 struct tpm_chip *chip = dev_get_drvdata(dev);
1021
403d1d03
SB		 1022 if (chip->vendor.duration[TPM_LONG] == 0)
1023 return 0;
1024
04ab2293
SB		 1025 return sprintf(buf, "%d %d %d [%s]\n",
1026 jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
1027 jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
1028 jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
1029 chip->vendor.duration_adjusted
1030 ? "adjusted" : "original");
1031}
1032EXPORT_SYMBOL_GPL(tpm_show_durations);
1033
62592101
SB		 1034ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
1035 char *buf)
1036{
1037 struct tpm_chip *chip = dev_get_drvdata(dev);
1038
1039 return sprintf(buf, "%d %d %d %d [%s]\n",
1040 jiffies_to_usecs(chip->vendor.timeout_a),
1041 jiffies_to_usecs(chip->vendor.timeout_b),
1042 jiffies_to_usecs(chip->vendor.timeout_c),
1043 jiffies_to_usecs(chip->vendor.timeout_d),
1044 chip->vendor.timeout_adjusted
1045 ? "adjusted" : "original");
1046}
1047EXPORT_SYMBOL_GPL(tpm_show_timeouts);
1048
6659ca2a
KH		 1049ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
1050 const char *buf, size_t count)
1051{
1052 struct tpm_chip *chip = dev_get_drvdata(dev);
1053 if (chip == NULL)
1054 return 0;
1055
90dda520 1056 chip->vendor.cancel(chip);
6659ca2a
KH		 1057 return count;
1058}
1059EXPORT_SYMBOL_GPL(tpm_store_cancel);
1da177e4 1060
fd048866
RA		 1061int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
1062 wait_queue_head_t *queue)
1063{
1064 unsigned long stop;
1065 long rc;
1066 u8 status;
1067
1068 /* check current status */
1069 status = chip->vendor.status(chip);
1070 if ((status & mask) == mask)
1071 return 0;
1072
1073 stop = jiffies + timeout;
1074
1075 if (chip->vendor.irq) {
1076again:
1077 timeout = stop - jiffies;
1078 if ((long)timeout <= 0)
1079 return -ETIME;
1080 rc = wait_event_interruptible_timeout(*queue,
1081 ((chip->vendor.status(chip)
1082 & mask) == mask),
1083 timeout);
1084 if (rc > 0)
1085 return 0;
1086 if (rc == -ERESTARTSYS && freezing(current)) {
1087 clear_thread_flag(TIF_SIGPENDING);
1088 goto again;
1089 }
1090 } else {
1091 do {
1092 msleep(TPM_TIMEOUT);
1093 status = chip->vendor.status(chip);
1094 if ((status & mask) == mask)
1095 return 0;
1096 } while (time_before(jiffies, stop));
1097 }
1098 return -ETIME;
1099}
1100EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
1da177e4
LT		 1101/*
1102 * Device file system interface to the TPM
f89c5edb
RA		 1103 *
1104 * It's assured that the chip will be opened just once,
1105 * by the check of is_open variable, which is protected
1106 * by driver_lock.
1da177e4
LT		 1107 */
1108int tpm_open(struct inode *inode, struct file *file)
1109{
f02a9364 1110 int minor = iminor(inode);
1da177e4
LT		 1111 struct tpm_chip *chip = NULL, *pos;
1112
f02a9364
RA		 1113 rcu_read_lock();
1114 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
90dda520 1115 if (pos->vendor.miscdev.minor == minor) {
1da177e4 1116 chip = pos;
f02a9364 1117 get_device(chip->dev);
1da177e4
LT		 1118 break;
1119 }
1120 }
f02a9364 1121 rcu_read_unlock();
1da177e4 1122
f02a9364
RA		 1123 if (!chip)
1124 return -ENODEV;
1da177e4 1125
dc36d32c 1126 if (test_and_set_bit(0, &chip->is_open)) {
b888c87b 1127 dev_dbg(chip->dev, "Another process owns this TPM\n");
f02a9364
RA		 1128 put_device(chip->dev);
1129 return -EBUSY;
1da177e4
LT		 1130 }
1131
1309d7af 1132 chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
1da177e4 1133 if (chip->data_buffer == NULL) {
dc36d32c 1134 clear_bit(0, &chip->is_open);
e659a3fe 1135 put_device(chip->dev);
1da177e4
LT		 1136 return -ENOMEM;
1137 }
1138
1139 atomic_set(&chip->data_pending, 0);
1140
1141 file->private_data = chip;
1142 return 0;
1da177e4 1143}
1da177e4
LT		 1144EXPORT_SYMBOL_GPL(tpm_open);
1145
f02a9364
RA		 1146/*
1147 * Called on file close
1148 */
1da177e4
LT		 1149int tpm_release(struct inode *inode, struct file *file)
1150{
1151 struct tpm_chip *chip = file->private_data;
1da177e4 1152
4bdec11f 1153 del_singleshot_timer_sync(&chip->user_read_timer);
2e5c44c9 1154 flush_work_sync(&chip->work);
5e976d55 1155 file->private_data = NULL;
1da177e4 1156 atomic_set(&chip->data_pending, 0);
f02a9364 1157 kfree(chip->data_buffer);
dc36d32c 1158 clear_bit(0, &chip->is_open);
e659a3fe 1159 put_device(chip->dev);
1da177e4
LT		 1160 return 0;
1161}
1da177e4
LT		 1162EXPORT_SYMBOL_GPL(tpm_release);
1163
b888c87b 1164ssize_t tpm_write(struct file *file, const char __user *buf,
3c2f606a 1165 size_t size, loff_t *off)
1da177e4
LT		 1166{
1167 struct tpm_chip *chip = file->private_data;
01476001 1168 size_t in_size = size, out_size;
1da177e4
LT		 1169
1170 /* cannot perform a write until the read has cleared
1171 either via tpm_read or a user_read_timer timeout */
700d8bdc
NA		 1172 while (atomic_read(&chip->data_pending) != 0)
1173 msleep(TPM_TIMEOUT);
1da177e4 1174
d081d470 1175 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 1176
1177 if (in_size > TPM_BUFSIZE)
1178 in_size = TPM_BUFSIZE;
1179
1180 if (copy_from_user
1181 (chip->data_buffer, (void __user *) buf, in_size)) {
d081d470 1182 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1183 return -EFAULT;
1184 }
1185
1186 /* atomic tpm command send and result receive */
1187 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1188
1189 atomic_set(&chip->data_pending, out_size);
d081d470 1190 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1191
1192 /* Set a timeout by which the reader must come claim the result */
fe3fd483 1193 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1da177e4
LT		 1194
1195 return in_size;
1196}
1da177e4
LT		 1197EXPORT_SYMBOL_GPL(tpm_write);
1198
3c2f606a
KJH		 1199ssize_t tpm_read(struct file *file, char __user *buf,
1200 size_t size, loff_t *off)
1da177e4
LT		 1201{
1202 struct tpm_chip *chip = file->private_data;
01476001 1203 ssize_t ret_size;
1da177e4 1204
5b44bd58 1205 del_singleshot_timer_sync(&chip->user_read_timer);
2e5c44c9 1206 flush_work_sync(&chip->work);
5b44bd58
KH		 1207 ret_size = atomic_read(&chip->data_pending);
1208 atomic_set(&chip->data_pending, 0);
1209 if (ret_size > 0) { /* relay data */
1210 if (size < ret_size)
1211 ret_size = size;
1da177e4 1212
d081d470 1213 mutex_lock(&chip->buffer_mutex);
f6a2382c 1214 if (copy_to_user(buf, chip->data_buffer, ret_size))
5b44bd58 1215 ret_size = -EFAULT;
d081d470 1216 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1217 }
1218
1219 return ret_size;
1220}
1da177e4
LT		 1221EXPORT_SYMBOL_GPL(tpm_read);
1222
e659a3fe 1223void tpm_remove_hardware(struct device *dev)
1da177e4 1224{
e659a3fe 1225 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1226
1227 if (chip == NULL) {
e659a3fe 1228 dev_err(dev, "No device data found\n");
1da177e4
LT		 1229 return;
1230 }
1231
1232 spin_lock(&driver_lock);
f02a9364 1233 list_del_rcu(&chip->list);
1da177e4 1234 spin_unlock(&driver_lock);
f02a9364 1235 synchronize_rcu();
1da177e4 1236
90dda520 1237 misc_deregister(&chip->vendor.miscdev);
90dda520 1238 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
55a82ab3 1239 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1240
5bd91f18
RM		 1241 /* write it this way to be explicit (chip->dev == dev) */
1242 put_device(chip->dev);
1da177e4 1243}
e659a3fe 1244EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4 1245
225a9be2
RA		 1246#define TPM_ORD_SAVESTATE cpu_to_be32(152)
1247#define SAVESTATE_RESULT_SIZE 10
1248
1249static struct tpm_input_header savestate_header = {
1250 .tag = TPM_TAG_RQU_COMMAND,
1251 .length = cpu_to_be32(10),
1252 .ordinal = TPM_ORD_SAVESTATE
1253};
1254
1da177e4
LT		 1255/*
1256 * We are about to suspend. Save the TPM state
1257 * so that it can be restored.
1258 */
ce2c87d4 1259int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1da177e4 1260{
ce2c87d4 1261 struct tpm_chip *chip = dev_get_drvdata(dev);
225a9be2
RA		 1262 struct tpm_cmd_t cmd;
1263 int rc;
1264
1265 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
2490c681 1266
1da177e4
LT		 1267 if (chip == NULL)
1268 return -ENODEV;
1269
225a9be2
RA		 1270 /* for buggy tpm, flush pcrs with extend to selected dummy */
1271 if (tpm_suspend_pcr) {
1272 cmd.header.in = pcrextend_header;
1273 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1274 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1275 TPM_DIGEST_SIZE);
1276 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1277 "extending dummy pcr before suspend");
1278 }
1279
1280 /* now do the actual savestate */
1281 cmd.header.in = savestate_header;
1282 rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
1283 "sending savestate before suspend");
1284 return rc;
1da177e4 1285}
1da177e4
LT		 1286EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1287
1288/*
1289 * Resume from a power safe. The BIOS already restored
1290 * the TPM state.
1291 */
ce2c87d4 1292int tpm_pm_resume(struct device *dev)
1da177e4 1293{
ce2c87d4 1294 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1295
1296 if (chip == NULL)
1297 return -ENODEV;
1298
1da177e4
LT		 1299 return 0;
1300}
1da177e4
LT		 1301EXPORT_SYMBOL_GPL(tpm_pm_resume);
1302
253115b7
RA		 1303/* In case vendor provided release function, call it too.*/
1304
1305void tpm_dev_vendor_release(struct tpm_chip *chip)
1306{
1307 if (chip->vendor.release)
1308 chip->vendor.release(chip->dev);
1309
1310 clear_bit(chip->dev_num, dev_mask);
1311 kfree(chip->vendor.miscdev.name);
1312}
1313EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1314
1315
5bd91f18
RM		 1316/*
1317 * Once all references to platform device are down to 0,
1318 * release all allocated structures.
5bd91f18 1319 */
cbb2ed4a 1320void tpm_dev_release(struct device *dev)
5bd91f18
RM		 1321{
1322 struct tpm_chip *chip = dev_get_drvdata(dev);
1323
253115b7 1324 tpm_dev_vendor_release(chip);
5bd91f18 1325
253115b7 1326 chip->release(dev);
5bd91f18
RM		 1327 kfree(chip);
1328}
253115b7 1329EXPORT_SYMBOL_GPL(tpm_dev_release);
5bd91f18 1330
1da177e4
LT		 1331/*
1332 * Called from tpm_<specific>.c probe function only for devices
1333 * the driver has determined it should claim. Prior to calling
1334 * this function the specific probe function has called pci_enable_device
1335 * upon errant exit from this function specific probe function should call
1336 * pci_disable_device
1337 */
f02a9364
RA		 1338struct tpm_chip *tpm_register_hardware(struct device *dev,
1339 const struct tpm_vendor_specific *entry)
1da177e4 1340{
6f9beccb
KJH		 1341#define DEVNAME_SIZE 7
1342
1343 char *devname;
1da177e4 1344 struct tpm_chip *chip;
1da177e4
LT		 1345
1346 /* Driver specific per-device data */
b888c87b 1347 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
8e39c933
PW		 1348 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1349
dd78c943
AM		 1350 if (chip == NULL || devname == NULL)
1351 goto out_free;
1da177e4 1352
d081d470
MK		 1353 mutex_init(&chip->buffer_mutex);
1354 mutex_init(&chip->tpm_mutex);
1da177e4
LT		 1355 INIT_LIST_HEAD(&chip->list);
1356
c4028958 1357 INIT_WORK(&chip->work, timeout_work);
09e12f9f 1358
40565f19
JS		 1359 setup_timer(&chip->user_read_timer, user_reader_timeout,
1360 (unsigned long)chip);
fe3fd483 1361
90dda520 1362 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4 1363
10685a95 1364 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1da177e4 1365
10685a95 1366 if (chip->dev_num >= TPM_NUM_DEVICES) {
b888c87b 1367 dev_err(dev, "No available tpm device numbers\n");
dd78c943 1368 goto out_free;
1da177e4 1369 } else if (chip->dev_num == 0)
90dda520 1370 chip->vendor.miscdev.minor = TPM_MINOR;
1da177e4 1371 else
90dda520 1372 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1da177e4 1373
10685a95
KJH		 1374 set_bit(chip->dev_num, dev_mask);
1375
6f9beccb 1376 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
90dda520 1377 chip->vendor.miscdev.name = devname;
1da177e4 1378
94fbcded 1379 chip->vendor.miscdev.parent = dev;
e659a3fe 1380 chip->dev = get_device(dev);
5bd91f18
RM		 1381 chip->release = dev->release;
1382 dev->release = tpm_dev_release;
1383 dev_set_drvdata(dev, chip);
1da177e4 1384
90dda520 1385 if (misc_register(&chip->vendor.miscdev)) {
e659a3fe 1386 dev_err(chip->dev,
1da177e4 1387 "unable to misc_register %s, minor %d\n",
90dda520
KJH		 1388 chip->vendor.miscdev.name,
1389 chip->vendor.miscdev.minor);
5bd91f18 1390 put_device(chip->dev);
e0dd03ca 1391 return NULL;
1da177e4
LT		 1392 }
1393
f33d9bd5 1394 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
5d469ec0 1395 misc_deregister(&chip->vendor.miscdev);
5bd91f18 1396 put_device(chip->dev);
f02a9364 1397
f33d9bd5
JG		 1398 return NULL;
1399 }
1da177e4 1400
55a82ab3
KJH		 1401 chip->bios_dir = tpm_bios_log_setup(devname);
1402
f02a9364
RA		 1403 /* Make chip available */
1404 spin_lock(&driver_lock);
1405 list_add_rcu(&chip->list, &tpm_chip_list);
1406 spin_unlock(&driver_lock);
1407
e0dd03ca 1408 return chip;
dd78c943
AM		 1409
1410out_free:
1411 kfree(chip);
1412 kfree(devname);
1413 return NULL;
1da177e4 1414}
1da177e4
LT		 1415EXPORT_SYMBOL_GPL(tpm_register_hardware);
1416
1da177e4
LT		 1417MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1418MODULE_DESCRIPTION("TPM Driver");
1419MODULE_VERSION("2.0");
1420MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)