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char/tpm: simplify duration calculation and eliminate smatch warning.
[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
07b133e6
PH		 43#define TSC_MAX_ORDINAL 12
44#define TPM_PROTECTED_COMMAND 0x00
45#define TPM_CONNECTION_COMMAND 0x40
9e18ee19 46
9b3056cc
DT		 47/*
48 * Bug workaround - some TPM's don't flush the most
49 * recently changed pcr on suspend, so force the flush
50 * with an extend to the selected _unused_ non-volatile pcr.
51 */
52static int tpm_suspend_pcr;
53module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
54MODULE_PARM_DESC(suspend_pcr,
55 "PCR to use for dummy writes to faciltate flush on suspend.");
56
1da177e4
LT		 57static LIST_HEAD(tpm_chip_list);
58static DEFINE_SPINLOCK(driver_lock);
10685a95 59static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
1da177e4 60
9e18ee19
KJH		 61/*
62 * Array with one entry per ordinal defining the maximum amount
63 * of time the chip could take to return the result. The ordinal
64 * designation of short, medium or long is defined in a table in
65 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
66 * values of the SHORT, MEDIUM, and LONG durations are retrieved
67 * from the chip during initialization with a call to tpm_get_timeouts.
68 */
9e18ee19
KJH		 69static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
70 TPM_UNDEFINED, /* 0 */
71 TPM_UNDEFINED,
72 TPM_UNDEFINED,
73 TPM_UNDEFINED,
74 TPM_UNDEFINED,
75 TPM_UNDEFINED, /* 5 */
76 TPM_UNDEFINED,
77 TPM_UNDEFINED,
78 TPM_UNDEFINED,
79 TPM_UNDEFINED,
80 TPM_SHORT, /* 10 */
81 TPM_SHORT,
82 TPM_MEDIUM,
83 TPM_LONG,
84 TPM_LONG,
85 TPM_MEDIUM, /* 15 */
86 TPM_SHORT,
87 TPM_SHORT,
88 TPM_MEDIUM,
89 TPM_LONG,
90 TPM_SHORT, /* 20 */
91 TPM_SHORT,
92 TPM_MEDIUM,
93 TPM_MEDIUM,
94 TPM_MEDIUM,
95 TPM_SHORT, /* 25 */
96 TPM_SHORT,
97 TPM_MEDIUM,
98 TPM_SHORT,
99 TPM_SHORT,
100 TPM_MEDIUM, /* 30 */
101 TPM_LONG,
102 TPM_MEDIUM,
103 TPM_SHORT,
104 TPM_SHORT,
105 TPM_SHORT, /* 35 */
106 TPM_MEDIUM,
107 TPM_MEDIUM,
108 TPM_UNDEFINED,
109 TPM_UNDEFINED,
110 TPM_MEDIUM, /* 40 */
111 TPM_LONG,
112 TPM_MEDIUM,
113 TPM_SHORT,
114 TPM_SHORT,
115 TPM_SHORT, /* 45 */
116 TPM_SHORT,
117 TPM_SHORT,
118 TPM_SHORT,
119 TPM_LONG,
120 TPM_MEDIUM, /* 50 */
121 TPM_MEDIUM,
122 TPM_UNDEFINED,
123 TPM_UNDEFINED,
124 TPM_UNDEFINED,
125 TPM_UNDEFINED, /* 55 */
126 TPM_UNDEFINED,
127 TPM_UNDEFINED,
128 TPM_UNDEFINED,
129 TPM_UNDEFINED,
130 TPM_MEDIUM, /* 60 */
131 TPM_MEDIUM,
132 TPM_MEDIUM,
133 TPM_SHORT,
134 TPM_SHORT,
135 TPM_MEDIUM, /* 65 */
136 TPM_UNDEFINED,
137 TPM_UNDEFINED,
138 TPM_UNDEFINED,
139 TPM_UNDEFINED,
140 TPM_SHORT, /* 70 */
141 TPM_SHORT,
142 TPM_UNDEFINED,
143 TPM_UNDEFINED,
144 TPM_UNDEFINED,
145 TPM_UNDEFINED, /* 75 */
146 TPM_UNDEFINED,
147 TPM_UNDEFINED,
148 TPM_UNDEFINED,
149 TPM_UNDEFINED,
150 TPM_LONG, /* 80 */
151 TPM_UNDEFINED,
152 TPM_MEDIUM,
153 TPM_LONG,
154 TPM_SHORT,
155 TPM_UNDEFINED, /* 85 */
156 TPM_UNDEFINED,
157 TPM_UNDEFINED,
158 TPM_UNDEFINED,
159 TPM_UNDEFINED,
160 TPM_SHORT, /* 90 */
161 TPM_SHORT,
162 TPM_SHORT,
163 TPM_SHORT,
164 TPM_SHORT,
165 TPM_UNDEFINED, /* 95 */
166 TPM_UNDEFINED,
167 TPM_UNDEFINED,
168 TPM_UNDEFINED,
169 TPM_UNDEFINED,
170 TPM_MEDIUM, /* 100 */
171 TPM_SHORT,
172 TPM_SHORT,
173 TPM_UNDEFINED,
174 TPM_UNDEFINED,
175 TPM_UNDEFINED, /* 105 */
176 TPM_UNDEFINED,
177 TPM_UNDEFINED,
178 TPM_UNDEFINED,
179 TPM_UNDEFINED,
180 TPM_SHORT, /* 110 */
181 TPM_SHORT,
182 TPM_SHORT,
183 TPM_SHORT,
184 TPM_SHORT,
185 TPM_SHORT, /* 115 */
186 TPM_SHORT,
187 TPM_SHORT,
188 TPM_UNDEFINED,
189 TPM_UNDEFINED,
190 TPM_LONG, /* 120 */
191 TPM_LONG,
192 TPM_MEDIUM,
193 TPM_UNDEFINED,
194 TPM_SHORT,
195 TPM_SHORT, /* 125 */
196 TPM_SHORT,
197 TPM_LONG,
198 TPM_SHORT,
199 TPM_SHORT,
200 TPM_SHORT, /* 130 */
201 TPM_MEDIUM,
202 TPM_UNDEFINED,
203 TPM_SHORT,
204 TPM_MEDIUM,
205 TPM_UNDEFINED, /* 135 */
206 TPM_UNDEFINED,
207 TPM_UNDEFINED,
208 TPM_UNDEFINED,
209 TPM_UNDEFINED,
210 TPM_SHORT, /* 140 */
211 TPM_SHORT,
212 TPM_UNDEFINED,
213 TPM_UNDEFINED,
214 TPM_UNDEFINED,
215 TPM_UNDEFINED, /* 145 */
216 TPM_UNDEFINED,
217 TPM_UNDEFINED,
218 TPM_UNDEFINED,
219 TPM_UNDEFINED,
220 TPM_SHORT, /* 150 */
221 TPM_MEDIUM,
222 TPM_MEDIUM,
223 TPM_SHORT,
224 TPM_SHORT,
225 TPM_UNDEFINED, /* 155 */
226 TPM_UNDEFINED,
227 TPM_UNDEFINED,
228 TPM_UNDEFINED,
229 TPM_UNDEFINED,
230 TPM_SHORT, /* 160 */
231 TPM_SHORT,
232 TPM_SHORT,
233 TPM_SHORT,
234 TPM_UNDEFINED,
235 TPM_UNDEFINED, /* 165 */
236 TPM_UNDEFINED,
237 TPM_UNDEFINED,
238 TPM_UNDEFINED,
239 TPM_UNDEFINED,
240 TPM_LONG, /* 170 */
241 TPM_UNDEFINED,
242 TPM_UNDEFINED,
243 TPM_UNDEFINED,
244 TPM_UNDEFINED,
245 TPM_UNDEFINED, /* 175 */
246 TPM_UNDEFINED,
247 TPM_UNDEFINED,
248 TPM_UNDEFINED,
249 TPM_UNDEFINED,
250 TPM_MEDIUM, /* 180 */
251 TPM_SHORT,
252 TPM_MEDIUM,
253 TPM_MEDIUM,
254 TPM_MEDIUM,
255 TPM_MEDIUM, /* 185 */
256 TPM_SHORT,
257 TPM_UNDEFINED,
258 TPM_UNDEFINED,
259 TPM_UNDEFINED,
260 TPM_UNDEFINED, /* 190 */
261 TPM_UNDEFINED,
262 TPM_UNDEFINED,
263 TPM_UNDEFINED,
264 TPM_UNDEFINED,
265 TPM_UNDEFINED, /* 195 */
266 TPM_UNDEFINED,
267 TPM_UNDEFINED,
268 TPM_UNDEFINED,
269 TPM_UNDEFINED,
270 TPM_SHORT, /* 200 */
271 TPM_UNDEFINED,
272 TPM_UNDEFINED,
273 TPM_UNDEFINED,
274 TPM_SHORT,
275 TPM_SHORT, /* 205 */
276 TPM_SHORT,
277 TPM_SHORT,
278 TPM_SHORT,
279 TPM_SHORT,
280 TPM_MEDIUM, /* 210 */
281 TPM_UNDEFINED,
282 TPM_MEDIUM,
283 TPM_MEDIUM,
284 TPM_MEDIUM,
285 TPM_UNDEFINED, /* 215 */
286 TPM_MEDIUM,
287 TPM_UNDEFINED,
288 TPM_UNDEFINED,
289 TPM_SHORT,
290 TPM_SHORT, /* 220 */
291 TPM_SHORT,
292 TPM_SHORT,
293 TPM_SHORT,
294 TPM_SHORT,
295 TPM_UNDEFINED, /* 225 */
296 TPM_UNDEFINED,
297 TPM_UNDEFINED,
298 TPM_UNDEFINED,
299 TPM_UNDEFINED,
300 TPM_SHORT, /* 230 */
301 TPM_LONG,
302 TPM_MEDIUM,
303 TPM_UNDEFINED,
304 TPM_UNDEFINED,
305 TPM_UNDEFINED, /* 235 */
306 TPM_UNDEFINED,
307 TPM_UNDEFINED,
308 TPM_UNDEFINED,
309 TPM_UNDEFINED,
310 TPM_SHORT, /* 240 */
311 TPM_UNDEFINED,
312 TPM_MEDIUM,
313};
314
1da177e4
LT		 315static void user_reader_timeout(unsigned long ptr)
316{
317 struct tpm_chip *chip = (struct tpm_chip *) ptr;
318
09e12f9f
KJH		 319 schedule_work(&chip->work);
320}
321
c4028958 322static void timeout_work(struct work_struct *work)
09e12f9f 323{
c4028958 324 struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
09e12f9f 325
d081d470 326 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 327 atomic_set(&chip->data_pending, 0);
328 memset(chip->data_buffer, 0, TPM_BUFSIZE);
d081d470 329 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 330}
331
9e18ee19
KJH		 332/*
333 * Returns max number of jiffies to wait
334 */
335unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
336 u32 ordinal)
337{
338 int duration_idx = TPM_UNDEFINED;
339 int duration = 0;
07b133e6 340 u8 category = (ordinal >> 24) & 0xFF;
9e18ee19 341
07b133e6
PH		 342 if ((category == TPM_PROTECTED_COMMAND && ordinal < TPM_MAX_ORDINAL) ||
343 (category == TPM_CONNECTION_COMMAND && ordinal < TSC_MAX_ORDINAL))
9e18ee19 344 duration_idx = tpm_ordinal_duration[ordinal];
9e18ee19 345
8d1dc20e 346 if (duration_idx != TPM_UNDEFINED)
36b20020 347 duration = chip->vendor.duration[duration_idx];
8d1dc20e 348 if (duration <= 0)
9e18ee19 349 return 2 * 60 * HZ;
8d1dc20e
LT		 350 else
351 return duration;
9e18ee19
KJH		 352}
353EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
354
1da177e4
LT		 355/*
356 * Internal kernel interface to transmit TPM commands
357 */
358static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
359 size_t bufsiz)
360{
d9e5b6bf 361 ssize_t rc;
9e18ee19 362 u32 count, ordinal;
700d8bdc 363 unsigned long stop;
1da177e4 364
6b07d30a
PH		 365 if (bufsiz > TPM_BUFSIZE)
366 bufsiz = TPM_BUFSIZE;
367
81179bb6 368 count = be32_to_cpu(*((__be32 *) (buf + 2)));
9e18ee19 369 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
1da177e4
LT		 370 if (count == 0)
371 return -ENODATA;
372 if (count > bufsiz) {
e659a3fe 373 dev_err(chip->dev,
b76be681 374 "invalid count value %x %zx \n", count, bufsiz);
1da177e4
LT		 375 return -E2BIG;
376 }
377
d081d470 378 mutex_lock(&chip->tpm_mutex);
1da177e4 379
90dda520 380 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
e659a3fe 381 dev_err(chip->dev,
d9e5b6bf
KH		 382 "tpm_transmit: tpm_send: error %zd\n", rc);
383 goto out;
1da177e4
LT		 384 }
385
27084efe
LD		 386 if (chip->vendor.irq)
387 goto out_recv;
388
9e18ee19 389 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
1da177e4 390 do {
90dda520
KJH		 391 u8 status = chip->vendor.status(chip);
392 if ((status & chip->vendor.req_complete_mask) ==
393 chip->vendor.req_complete_val)
1da177e4 394 goto out_recv;
d9e5b6bf 395
90dda520 396 if ((status == chip->vendor.req_canceled)) {
e659a3fe 397 dev_err(chip->dev, "Operation Canceled\n");
d9e5b6bf
KH		 398 rc = -ECANCELED;
399 goto out;
400 }
401
402 msleep(TPM_TIMEOUT); /* CHECK */
1da177e4 403 rmb();
700d8bdc 404 } while (time_before(jiffies, stop));
1da177e4 405
90dda520 406 chip->vendor.cancel(chip);
e659a3fe 407 dev_err(chip->dev, "Operation Timed out\n");
d9e5b6bf
KH		 408 rc = -ETIME;
409 goto out;
1da177e4
LT		 410
411out_recv:
90dda520 412 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
d9e5b6bf 413 if (rc < 0)
e659a3fe 414 dev_err(chip->dev,
d9e5b6bf
KH		 415 "tpm_transmit: tpm_recv: error %zd\n", rc);
416out:
d081d470 417 mutex_unlock(&chip->tpm_mutex);
d9e5b6bf 418 return rc;
1da177e4
LT		 419}
420
421#define TPM_DIGEST_SIZE 20
beed53a1 422#define TPM_RET_CODE_IDX 6
beed53a1
KJH		 423
424enum tpm_capabilities {
08837438
RA		 425 TPM_CAP_FLAG = cpu_to_be32(4),
426 TPM_CAP_PROP = cpu_to_be32(5),
427 CAP_VERSION_1_1 = cpu_to_be32(0x06),
428 CAP_VERSION_1_2 = cpu_to_be32(0x1A)
beed53a1
KJH		 429};
430
431enum tpm_sub_capabilities {
08837438
RA		 432 TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
433 TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
434 TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
435 TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
436 TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
437 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
438 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
beed53a1 439
1da177e4
LT		 440};
441
08837438
RA		 442static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
443 int len, const char *desc)
beed53a1
KJH		 444{
445 int err;
446
08837438 447 len = tpm_transmit(chip,(u8 *) cmd, len);
beed53a1
KJH		 448 if (len < 0)
449 return len;
b9e3238a
RA		 450 else if (len < TPM_HEADER_SIZE)
451 return -EFAULT;
452
453 err = be32_to_cpu(cmd->header.out.return_code);
454 if (err != 0)
455 dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
456
457 return err;
beed53a1
KJH		 458}
459
08837438
RA		 460#define TPM_INTERNAL_RESULT_SIZE 200
461#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
462#define TPM_ORD_GET_CAP cpu_to_be32(101)
41ab999c 463#define TPM_ORD_GET_RANDOM cpu_to_be32(70)
08837438
RA		 464
465static const struct tpm_input_header tpm_getcap_header = {
466 .tag = TPM_TAG_RQU_COMMAND,
467 .length = cpu_to_be32(22),
468 .ordinal = TPM_ORD_GET_CAP
469};
470
471ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
472 const char *desc)
473{
474 struct tpm_cmd_t tpm_cmd;
475 int rc;
476 struct tpm_chip *chip = dev_get_drvdata(dev);
477
478 tpm_cmd.header.in = tpm_getcap_header;
479 if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
480 tpm_cmd.params.getcap_in.cap = subcap_id;
481 /*subcap field not necessary */
482 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
483 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
484 } else {
485 if (subcap_id == TPM_CAP_FLAG_PERM ||
486 subcap_id == TPM_CAP_FLAG_VOL)
487 tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
488 else
489 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
490 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
491 tpm_cmd.params.getcap_in.subcap = subcap_id;
492 }
493 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
494 if (!rc)
495 *cap = tpm_cmd.params.getcap_out.cap;
496 return rc;
497}
498
08e96e48
KJH		 499void tpm_gen_interrupt(struct tpm_chip *chip)
500{
08837438 501 struct tpm_cmd_t tpm_cmd;
08e96e48
KJH		 502 ssize_t rc;
503
08837438
RA		 504 tpm_cmd.header.in = tpm_getcap_header;
505 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
506 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
507 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 508
08837438 509 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 510 "attempting to determine the timeouts");
511}
512EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
513
2b30a90f 514int tpm_get_timeouts(struct tpm_chip *chip)
08e96e48 515{
08837438
RA		 516 struct tpm_cmd_t tpm_cmd;
517 struct timeout_t *timeout_cap;
518 struct duration_t *duration_cap;
08e96e48
KJH		 519 ssize_t rc;
520 u32 timeout;
e3e1a1e1 521 unsigned int scale = 1;
08e96e48 522
08837438
RA		 523 tpm_cmd.header.in = tpm_getcap_header;
524 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
525 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
526 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 527
08837438 528 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 529 "attempting to determine the timeouts");
530 if (rc)
531 goto duration;
532
829bf067
SB		 533 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
534 be32_to_cpu(tpm_cmd.header.out.length)
535 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
2b30a90f 536 return -EINVAL;
08e96e48 537
08837438 538 timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
08e96e48 539 /* Don't overwrite default if value is 0 */
08837438 540 timeout = be32_to_cpu(timeout_cap->a);
e3e1a1e1
SB		 541 if (timeout && timeout < 1000) {
542 /* timeouts in msec rather usec */
543 scale = 1000;
62592101 544 chip->vendor.timeout_adjusted = true;
e3e1a1e1 545 }
08e96e48 546 if (timeout)
e3e1a1e1 547 chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
08837438 548 timeout = be32_to_cpu(timeout_cap->b);
08e96e48 549 if (timeout)
e3e1a1e1 550 chip->vendor.timeout_b = usecs_to_jiffies(timeout * scale);
08837438 551 timeout = be32_to_cpu(timeout_cap->c);
08e96e48 552 if (timeout)
e3e1a1e1 553 chip->vendor.timeout_c = usecs_to_jiffies(timeout * scale);
08837438 554 timeout = be32_to_cpu(timeout_cap->d);
08e96e48 555 if (timeout)
e3e1a1e1 556 chip->vendor.timeout_d = usecs_to_jiffies(timeout * scale);
08e96e48
KJH		 557
558duration:
08837438
RA		 559 tpm_cmd.header.in = tpm_getcap_header;
560 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
561 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
562 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
08e96e48 563
08837438 564 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 565 "attempting to determine the durations");
566 if (rc)
2b30a90f 567 return rc;
08e96e48 568
979b1406
SB		 569 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
570 be32_to_cpu(tpm_cmd.header.out.length)
571 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
2b30a90f 572 return -EINVAL;
979b1406 573
08837438 574 duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
08e96e48 575 chip->vendor.duration[TPM_SHORT] =
08837438 576 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
e934acca
SB		 577 chip->vendor.duration[TPM_MEDIUM] =
578 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
579 chip->vendor.duration[TPM_LONG] =
580 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
581
292cf4a8
VK		 582 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
583 * value wrong and apparently reports msecs rather than usecs. So we
584 * fix up the resulting too-small TPM_SHORT value to make things work.
e934acca 585 * We also scale the TPM_MEDIUM and -_LONG values by 1000.
292cf4a8 586 */
e934acca 587 if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
292cf4a8 588 chip->vendor.duration[TPM_SHORT] = HZ;
e934acca
SB		 589 chip->vendor.duration[TPM_MEDIUM] *= 1000;
590 chip->vendor.duration[TPM_LONG] *= 1000;
04ab2293 591 chip->vendor.duration_adjusted = true;
e934acca
SB		 592 dev_info(chip->dev, "Adjusting TPM timeout parameters.");
593 }
2b30a90f 594 return 0;
08e96e48
KJH		 595}
596EXPORT_SYMBOL_GPL(tpm_get_timeouts);
597
d97c6ade
SB		 598#define TPM_ORD_CONTINUE_SELFTEST 83
599#define CONTINUE_SELFTEST_RESULT_SIZE 10
600
601static struct tpm_input_header continue_selftest_header = {
602 .tag = TPM_TAG_RQU_COMMAND,
603 .length = cpu_to_be32(10),
604 .ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
605};
606
607/**
608 * tpm_continue_selftest -- run TPM's selftest
609 * @chip: TPM chip to use
610 *
611 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
612 * a TPM error code.
613 */
68d6e671 614static int tpm_continue_selftest(struct tpm_chip *chip)
08e96e48 615{
d97c6ade
SB		 616 int rc;
617 struct tpm_cmd_t cmd;
08e96e48 618
d97c6ade
SB		 619 cmd.header.in = continue_selftest_header;
620 rc = transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
621 "continue selftest");
622 return rc;
08e96e48 623}
08e96e48
KJH		 624
625ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
626 char *buf)
627{
08837438 628 cap_t cap;
08e96e48
KJH		 629 ssize_t rc;
630
08837438
RA		 631 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
632 "attempting to determine the permanent enabled state");
633 if (rc)
08e96e48 634 return 0;
ec288bd3 635
08837438 636 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
ec288bd3 637 return rc;
08e96e48
KJH		 638}
639EXPORT_SYMBOL_GPL(tpm_show_enabled);
640
641ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
642 char *buf)
643{
08837438 644 cap_t cap;
08e96e48
KJH		 645 ssize_t rc;
646
08837438
RA		 647 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
648 "attempting to determine the permanent active state");
649 if (rc)
08e96e48 650 return 0;
ec288bd3 651
08837438 652 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
ec288bd3 653 return rc;
08e96e48
KJH		 654}
655EXPORT_SYMBOL_GPL(tpm_show_active);
656
657ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
658 char *buf)
659{
08837438 660 cap_t cap;
08e96e48
KJH		 661 ssize_t rc;
662
08837438
RA		 663 rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
664 "attempting to determine the owner state");
665 if (rc)
08e96e48 666 return 0;
ec288bd3 667
08837438 668 rc = sprintf(buf, "%d\n", cap.owned);
ec288bd3 669 return rc;
08e96e48
KJH		 670}
671EXPORT_SYMBOL_GPL(tpm_show_owned);
672
673ssize_t tpm_show_temp_deactivated(struct device * dev,
674 struct device_attribute * attr, char *buf)
675{
08837438 676 cap_t cap;
08e96e48
KJH		 677 ssize_t rc;
678
08837438
RA		 679 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
680 "attempting to determine the temporary state");
681 if (rc)
08e96e48 682 return 0;
ec288bd3 683
08837438 684 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
ec288bd3 685 return rc;
08e96e48
KJH		 686}
687EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
688
659aaf2b
RA		 689/*
690 * tpm_chip_find_get - return tpm_chip for given chip number
691 */
692static struct tpm_chip *tpm_chip_find_get(int chip_num)
693{
8920d5ad 694 struct tpm_chip *pos, *chip = NULL;
659aaf2b
RA		 695
696 rcu_read_lock();
697 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
698 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
699 continue;
700
8920d5ad
RA		 701 if (try_module_get(pos->dev->driver->owner)) {
702 chip = pos;
659aaf2b 703 break;
8920d5ad 704 }
659aaf2b
RA		 705 }
706 rcu_read_unlock();
8920d5ad 707 return chip;
659aaf2b
RA		 708}
709
710#define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
711#define READ_PCR_RESULT_SIZE 30
712static struct tpm_input_header pcrread_header = {
713 .tag = TPM_TAG_RQU_COMMAND,
714 .length = cpu_to_be32(14),
715 .ordinal = TPM_ORDINAL_PCRREAD
1da177e4
LT		 716};
717
68d6e671 718static int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
659aaf2b
RA		 719{
720 int rc;
721 struct tpm_cmd_t cmd;
722
723 cmd.header.in = pcrread_header;
724 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
23acb98d 725 rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
659aaf2b
RA		 726 "attempting to read a pcr value");
727
728 if (rc == 0)
729 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
730 TPM_DIGEST_SIZE);
731 return rc;
732}
733
734/**
735 * tpm_pcr_read - read a pcr value
736 * @chip_num: tpm idx # or ANY
737 * @pcr_idx: pcr idx to retrieve
738 * @res_buf: TPM_PCR value
739 * size of res_buf is 20 bytes (or NULL if you don't care)
740 *
741 * The TPM driver should be built-in, but for whatever reason it
742 * isn't, protect against the chip disappearing, by incrementing
743 * the module usage count.
744 */
745int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
746{
747 struct tpm_chip *chip;
748 int rc;
749
750 chip = tpm_chip_find_get(chip_num);
751 if (chip == NULL)
752 return -ENODEV;
753 rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
a0e39349 754 tpm_chip_put(chip);
659aaf2b
RA		 755 return rc;
756}
757EXPORT_SYMBOL_GPL(tpm_pcr_read);
758
759/**
760 * tpm_pcr_extend - extend pcr value with hash
761 * @chip_num: tpm idx # or AN&
762 * @pcr_idx: pcr idx to extend
763 * @hash: hash value used to extend pcr value
764 *
765 * The TPM driver should be built-in, but for whatever reason it
766 * isn't, protect against the chip disappearing, by incrementing
767 * the module usage count.
768 */
769#define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
0afd9056 770#define EXTEND_PCR_RESULT_SIZE 34
659aaf2b
RA		 771static struct tpm_input_header pcrextend_header = {
772 .tag = TPM_TAG_RQU_COMMAND,
773 .length = cpu_to_be32(34),
774 .ordinal = TPM_ORD_PCR_EXTEND
775};
776
777int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
778{
779 struct tpm_cmd_t cmd;
780 int rc;
781 struct tpm_chip *chip;
782
783 chip = tpm_chip_find_get(chip_num);
784 if (chip == NULL)
785 return -ENODEV;
786
787 cmd.header.in = pcrextend_header;
659aaf2b
RA		 788 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
789 memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
0afd9056 790 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
659aaf2b
RA		 791 "attempting extend a PCR value");
792
a0e39349 793 tpm_chip_put(chip);
659aaf2b
RA		 794 return rc;
795}
796EXPORT_SYMBOL_GPL(tpm_pcr_extend);
797
68d6e671
SB		 798/**
799 * tpm_do_selftest - have the TPM continue its selftest and wait until it
800 * can receive further commands
801 * @chip: TPM chip to use
802 *
803 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
804 * a TPM error code.
805 */
806int tpm_do_selftest(struct tpm_chip *chip)
807{
808 int rc;
68d6e671
SB		 809 unsigned int loops;
810 unsigned int delay_msec = 1000;
811 unsigned long duration;
24ebe667 812 struct tpm_cmd_t cmd;
68d6e671
SB		 813
814 duration = tpm_calc_ordinal_duration(chip,
815 TPM_ORD_CONTINUE_SELFTEST);
816
817 loops = jiffies_to_msecs(duration) / delay_msec;
818
819 rc = tpm_continue_selftest(chip);
820 /* This may fail if there was no TPM driver during a suspend/resume
821 * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST)
822 */
823 if (rc)
824 return rc;
825
826 do {
24ebe667
RA		 827 /* Attempt to read a PCR value */
828 cmd.header.in = pcrread_header;
829 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(0);
830 rc = tpm_transmit(chip, (u8 *) &cmd, READ_PCR_RESULT_SIZE);
831
832 if (rc < TPM_HEADER_SIZE)
833 return -EFAULT;
834
835 rc = be32_to_cpu(cmd.header.out.return_code);
be405411
SB		 836 if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
837 dev_info(chip->dev,
838 "TPM is disabled/deactivated (0x%X)\n", rc);
839 /* TPM is disabled and/or deactivated; driver can
840 * proceed and TPM does handle commands for
841 * suspend/resume correctly
842 */
843 return 0;
844 }
68d6e671
SB		 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 900#define TPM_ORD_READPUBEK cpu_to_be32(124)
81198078 901static struct tpm_input_header tpm_readpubek_header = {
08837438
RA		 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);
43829731 1154 flush_work(&chip->work);
5e976d55 1155 file->private_data = NULL;
1da177e4 1156 atomic_set(&chip->data_pending, 0);
dd7da132 1157 kzfree(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;
abce9ac2
PH		 1168 size_t in_size = size;
1169 ssize_t out_size;
1da177e4
LT		 1170
1171 /* cannot perform a write until the read has cleared
abce9ac2
PH		 1172 either via tpm_read or a user_read_timer timeout.
1173 This also prevents splitted buffered writes from blocking here.
1174 */
1175 if (atomic_read(&chip->data_pending) != 0)
1176 return -EBUSY;
1da177e4
LT		 1177
1178 if (in_size > TPM_BUFSIZE)
abce9ac2
PH		 1179 return -E2BIG;
1180
1181 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 1182
1183 if (copy_from_user
1184 (chip->data_buffer, (void __user *) buf, in_size)) {
d081d470 1185 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1186 return -EFAULT;
1187 }
1188
1189 /* atomic tpm command send and result receive */
1190 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
abce9ac2
PH		 1191 if (out_size < 0) {
1192 mutex_unlock(&chip->buffer_mutex);
1193 return out_size;
1194 }
1da177e4
LT		 1195
1196 atomic_set(&chip->data_pending, out_size);
d081d470 1197 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1198
1199 /* Set a timeout by which the reader must come claim the result */
fe3fd483 1200 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1da177e4
LT		 1201
1202 return in_size;
1203}
1da177e4
LT		 1204EXPORT_SYMBOL_GPL(tpm_write);
1205
3c2f606a
KJH		 1206ssize_t tpm_read(struct file *file, char __user *buf,
1207 size_t size, loff_t *off)
1da177e4
LT		 1208{
1209 struct tpm_chip *chip = file->private_data;
01476001 1210 ssize_t ret_size;
3321c07a 1211 int rc;
1da177e4 1212
5b44bd58 1213 del_singleshot_timer_sync(&chip->user_read_timer);
43829731 1214 flush_work(&chip->work);
5b44bd58 1215 ret_size = atomic_read(&chip->data_pending);
5b44bd58 1216 if (ret_size > 0) { /* relay data */
3ab1aff8 1217 ssize_t orig_ret_size = ret_size;
5b44bd58
KH		 1218 if (size < ret_size)
1219 ret_size = size;
1da177e4 1220
d081d470 1221 mutex_lock(&chip->buffer_mutex);
3321c07a 1222 rc = copy_to_user(buf, chip->data_buffer, ret_size);
3ab1aff8 1223 memset(chip->data_buffer, 0, orig_ret_size);
3321c07a 1224 if (rc)
5b44bd58 1225 ret_size = -EFAULT;
3321c07a 1226
d081d470 1227 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1228 }
1229
dd7da132
KY		 1230 atomic_set(&chip->data_pending, 0);
1231
1da177e4
LT		 1232 return ret_size;
1233}
1da177e4
LT		 1234EXPORT_SYMBOL_GPL(tpm_read);
1235
e659a3fe 1236void tpm_remove_hardware(struct device *dev)
1da177e4 1237{
e659a3fe 1238 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1239
1240 if (chip == NULL) {
e659a3fe 1241 dev_err(dev, "No device data found\n");
1da177e4
LT		 1242 return;
1243 }
1244
1245 spin_lock(&driver_lock);
f02a9364 1246 list_del_rcu(&chip->list);
1da177e4 1247 spin_unlock(&driver_lock);
f02a9364 1248 synchronize_rcu();
1da177e4 1249
90dda520 1250 misc_deregister(&chip->vendor.miscdev);
90dda520 1251 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1631cfb7 1252 tpm_remove_ppi(&dev->kobj);
55a82ab3 1253 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1254
5bd91f18
RM		 1255 /* write it this way to be explicit (chip->dev == dev) */
1256 put_device(chip->dev);
1da177e4 1257}
e659a3fe 1258EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4 1259
225a9be2
RA		 1260#define TPM_ORD_SAVESTATE cpu_to_be32(152)
1261#define SAVESTATE_RESULT_SIZE 10
1262
1263static struct tpm_input_header savestate_header = {
1264 .tag = TPM_TAG_RQU_COMMAND,
1265 .length = cpu_to_be32(10),
1266 .ordinal = TPM_ORD_SAVESTATE
1267};
1268
1da177e4
LT		 1269/*
1270 * We are about to suspend. Save the TPM state
1271 * so that it can be restored.
1272 */
035e2ce8 1273int tpm_pm_suspend(struct device *dev)
1da177e4 1274{
ce2c87d4 1275 struct tpm_chip *chip = dev_get_drvdata(dev);
225a9be2
RA		 1276 struct tpm_cmd_t cmd;
1277 int rc;
1278
1279 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
2490c681 1280
1da177e4
LT		 1281 if (chip == NULL)
1282 return -ENODEV;
1283
225a9be2
RA		 1284 /* for buggy tpm, flush pcrs with extend to selected dummy */
1285 if (tpm_suspend_pcr) {
1286 cmd.header.in = pcrextend_header;
1287 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1288 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1289 TPM_DIGEST_SIZE);
1290 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1291 "extending dummy pcr before suspend");
1292 }
1293
1294 /* now do the actual savestate */
1295 cmd.header.in = savestate_header;
1296 rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
1297 "sending savestate before suspend");
1298 return rc;
1da177e4 1299}
1da177e4
LT		 1300EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1301
1302/*
1303 * Resume from a power safe. The BIOS already restored
1304 * the TPM state.
1305 */
ce2c87d4 1306int tpm_pm_resume(struct device *dev)
1da177e4 1307{
ce2c87d4 1308 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1309
1310 if (chip == NULL)
1311 return -ENODEV;
1312
1da177e4
LT		 1313 return 0;
1314}
1da177e4
LT		 1315EXPORT_SYMBOL_GPL(tpm_pm_resume);
1316
41ab999c
KY		 1317#define TPM_GETRANDOM_RESULT_SIZE 18
1318static struct tpm_input_header tpm_getrandom_header = {
1319 .tag = TPM_TAG_RQU_COMMAND,
1320 .length = cpu_to_be32(14),
1321 .ordinal = TPM_ORD_GET_RANDOM
1322};
1323
1324/**
1325 * tpm_get_random() - Get random bytes from the tpm's RNG
1326 * @chip_num: A specific chip number for the request or TPM_ANY_NUM
1327 * @out: destination buffer for the random bytes
1328 * @max: the max number of bytes to write to @out
1329 *
1330 * Returns < 0 on error and the number of bytes read on success
1331 */
1332int tpm_get_random(u32 chip_num, u8 *out, size_t max)
1333{
1334 struct tpm_chip *chip;
1335 struct tpm_cmd_t tpm_cmd;
1336 u32 recd, num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA);
1337 int err, total = 0, retries = 5;
1338 u8 *dest = out;
1339
1340 chip = tpm_chip_find_get(chip_num);
1341 if (chip == NULL)
1342 return -ENODEV;
1343
1344 if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
1345 return -EINVAL;
1346
1347 do {
1348 tpm_cmd.header.in = tpm_getrandom_header;
1349 tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
1350
1351 err = transmit_cmd(chip, &tpm_cmd,
1352 TPM_GETRANDOM_RESULT_SIZE + num_bytes,
1353 "attempting get random");
1354 if (err)
1355 break;
1356
1357 recd = be32_to_cpu(tpm_cmd.params.getrandom_out.rng_data_len);
1358 memcpy(dest, tpm_cmd.params.getrandom_out.rng_data, recd);
1359
1360 dest += recd;
1361 total += recd;
1362 num_bytes -= recd;
1363 } while (retries-- && total < max);
1364
1365 return total ? total : -EIO;
1366}
1367EXPORT_SYMBOL_GPL(tpm_get_random);
1368
253115b7
RA		 1369/* In case vendor provided release function, call it too.*/
1370
1371void tpm_dev_vendor_release(struct tpm_chip *chip)
1372{
3072928f
AS		 1373 if (!chip)
1374 return;
1375
253115b7
RA		 1376 if (chip->vendor.release)
1377 chip->vendor.release(chip->dev);
1378
1379 clear_bit(chip->dev_num, dev_mask);
1380 kfree(chip->vendor.miscdev.name);
1381}
1382EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1383
1384
5bd91f18
RM		 1385/*
1386 * Once all references to platform device are down to 0,
1387 * release all allocated structures.
5bd91f18 1388 */
81198078 1389static void tpm_dev_release(struct device *dev)
5bd91f18
RM		 1390{
1391 struct tpm_chip *chip = dev_get_drvdata(dev);
1392
3072928f
AS		 1393 if (!chip)
1394 return;
1395
253115b7 1396 tpm_dev_vendor_release(chip);
5bd91f18 1397
253115b7 1398 chip->release(dev);
5bd91f18
RM		 1399 kfree(chip);
1400}
253115b7 1401EXPORT_SYMBOL_GPL(tpm_dev_release);
5bd91f18 1402
1da177e4
LT		 1403/*
1404 * Called from tpm_<specific>.c probe function only for devices
1405 * the driver has determined it should claim. Prior to calling
1406 * this function the specific probe function has called pci_enable_device
1407 * upon errant exit from this function specific probe function should call
1408 * pci_disable_device
1409 */
f02a9364
RA		 1410struct tpm_chip *tpm_register_hardware(struct device *dev,
1411 const struct tpm_vendor_specific *entry)
1da177e4 1412{
6f9beccb
KJH		 1413#define DEVNAME_SIZE 7
1414
1415 char *devname;
1da177e4 1416 struct tpm_chip *chip;
1da177e4
LT		 1417
1418 /* Driver specific per-device data */
b888c87b 1419 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
8e39c933
PW		 1420 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1421
dd78c943
AM		 1422 if (chip == NULL || devname == NULL)
1423 goto out_free;
1da177e4 1424
d081d470
MK		 1425 mutex_init(&chip->buffer_mutex);
1426 mutex_init(&chip->tpm_mutex);
1da177e4
LT		 1427 INIT_LIST_HEAD(&chip->list);
1428
c4028958 1429 INIT_WORK(&chip->work, timeout_work);
09e12f9f 1430
40565f19
JS		 1431 setup_timer(&chip->user_read_timer, user_reader_timeout,
1432 (unsigned long)chip);
fe3fd483 1433
90dda520 1434 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4 1435
10685a95 1436 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1da177e4 1437
10685a95 1438 if (chip->dev_num >= TPM_NUM_DEVICES) {
b888c87b 1439 dev_err(dev, "No available tpm device numbers\n");
dd78c943 1440 goto out_free;
1da177e4 1441 } else if (chip->dev_num == 0)
90dda520 1442 chip->vendor.miscdev.minor = TPM_MINOR;
1da177e4 1443 else
90dda520 1444 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1da177e4 1445
10685a95
KJH		 1446 set_bit(chip->dev_num, dev_mask);
1447
6f9beccb 1448 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
90dda520 1449 chip->vendor.miscdev.name = devname;
1da177e4 1450
94fbcded 1451 chip->vendor.miscdev.parent = dev;
e659a3fe 1452 chip->dev = get_device(dev);
5bd91f18
RM		 1453 chip->release = dev->release;
1454 dev->release = tpm_dev_release;
1455 dev_set_drvdata(dev, chip);
1da177e4 1456
90dda520 1457 if (misc_register(&chip->vendor.miscdev)) {
e659a3fe 1458 dev_err(chip->dev,
1da177e4 1459 "unable to misc_register %s, minor %d\n",
90dda520
KJH		 1460 chip->vendor.miscdev.name,
1461 chip->vendor.miscdev.minor);
dad79cb8 1462 goto put_device;
1da177e4
LT		 1463 }
1464
f33d9bd5 1465 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
5d469ec0 1466 misc_deregister(&chip->vendor.miscdev);
dad79cb8 1467 goto put_device;
f33d9bd5 1468 }
1da177e4 1469
1631cfb7 1470 if (tpm_add_ppi(&dev->kobj)) {
f84fdff0
XZ		 1471 misc_deregister(&chip->vendor.miscdev);
1472 goto put_device;
1473 }
1474
55a82ab3
KJH		 1475 chip->bios_dir = tpm_bios_log_setup(devname);
1476
f02a9364
RA		 1477 /* Make chip available */
1478 spin_lock(&driver_lock);
1479 list_add_rcu(&chip->list, &tpm_chip_list);
1480 spin_unlock(&driver_lock);
1481
e0dd03ca 1482 return chip;
dd78c943 1483
dad79cb8
WG		 1484put_device:
1485 put_device(chip->dev);
dd78c943
AM		 1486out_free:
1487 kfree(chip);
1488 kfree(devname);
1489 return NULL;
1da177e4 1490}
1da177e4
LT		 1491EXPORT_SYMBOL_GPL(tpm_register_hardware);
1492
1da177e4
LT		 1493MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1494MODULE_DESCRIPTION("TPM Driver");
1495MODULE_VERSION("2.0");
1496MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)