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SELinux: reset the security_ops before flushing the avc cache
[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>
d081d470 27#include <linux/mutex.h>
1da177e4 28#include <linux/spinlock.h>
d081d470 29
1da177e4
LT		 30#include "tpm.h"
31
3122a88a
KH		 32enum tpm_const {
33 TPM_MINOR = 224, /* officially assigned */
7f366784 34 TPM_BUFSIZE = 4096,
3122a88a 35 TPM_NUM_DEVICES = 256,
3122a88a 36};
1da177e4 37
9e18ee19
KJH		 38enum tpm_duration {
39 TPM_SHORT = 0,
40 TPM_MEDIUM = 1,
41 TPM_LONG = 2,
42 TPM_UNDEFINED,
43};
44
45#define TPM_MAX_ORDINAL 243
46#define TPM_MAX_PROTECTED_ORDINAL 12
47#define TPM_PROTECTED_ORDINAL_MASK 0xFF
48
1da177e4
LT		 49static LIST_HEAD(tpm_chip_list);
50static DEFINE_SPINLOCK(driver_lock);
10685a95 51static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
1da177e4 52
9e18ee19
KJH		 53/*
54 * Array with one entry per ordinal defining the maximum amount
55 * of time the chip could take to return the result. The ordinal
56 * designation of short, medium or long is defined in a table in
57 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
58 * values of the SHORT, MEDIUM, and LONG durations are retrieved
59 * from the chip during initialization with a call to tpm_get_timeouts.
60 */
61static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
62 TPM_UNDEFINED, /* 0 */
63 TPM_UNDEFINED,
64 TPM_UNDEFINED,
65 TPM_UNDEFINED,
66 TPM_UNDEFINED,
67 TPM_UNDEFINED, /* 5 */
68 TPM_UNDEFINED,
69 TPM_UNDEFINED,
70 TPM_UNDEFINED,
71 TPM_UNDEFINED,
72 TPM_SHORT, /* 10 */
73 TPM_SHORT,
74};
75
76static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
77 TPM_UNDEFINED, /* 0 */
78 TPM_UNDEFINED,
79 TPM_UNDEFINED,
80 TPM_UNDEFINED,
81 TPM_UNDEFINED,
82 TPM_UNDEFINED, /* 5 */
83 TPM_UNDEFINED,
84 TPM_UNDEFINED,
85 TPM_UNDEFINED,
86 TPM_UNDEFINED,
87 TPM_SHORT, /* 10 */
88 TPM_SHORT,
89 TPM_MEDIUM,
90 TPM_LONG,
91 TPM_LONG,
92 TPM_MEDIUM, /* 15 */
93 TPM_SHORT,
94 TPM_SHORT,
95 TPM_MEDIUM,
96 TPM_LONG,
97 TPM_SHORT, /* 20 */
98 TPM_SHORT,
99 TPM_MEDIUM,
100 TPM_MEDIUM,
101 TPM_MEDIUM,
102 TPM_SHORT, /* 25 */
103 TPM_SHORT,
104 TPM_MEDIUM,
105 TPM_SHORT,
106 TPM_SHORT,
107 TPM_MEDIUM, /* 30 */
108 TPM_LONG,
109 TPM_MEDIUM,
110 TPM_SHORT,
111 TPM_SHORT,
112 TPM_SHORT, /* 35 */
113 TPM_MEDIUM,
114 TPM_MEDIUM,
115 TPM_UNDEFINED,
116 TPM_UNDEFINED,
117 TPM_MEDIUM, /* 40 */
118 TPM_LONG,
119 TPM_MEDIUM,
120 TPM_SHORT,
121 TPM_SHORT,
122 TPM_SHORT, /* 45 */
123 TPM_SHORT,
124 TPM_SHORT,
125 TPM_SHORT,
126 TPM_LONG,
127 TPM_MEDIUM, /* 50 */
128 TPM_MEDIUM,
129 TPM_UNDEFINED,
130 TPM_UNDEFINED,
131 TPM_UNDEFINED,
132 TPM_UNDEFINED, /* 55 */
133 TPM_UNDEFINED,
134 TPM_UNDEFINED,
135 TPM_UNDEFINED,
136 TPM_UNDEFINED,
137 TPM_MEDIUM, /* 60 */
138 TPM_MEDIUM,
139 TPM_MEDIUM,
140 TPM_SHORT,
141 TPM_SHORT,
142 TPM_MEDIUM, /* 65 */
143 TPM_UNDEFINED,
144 TPM_UNDEFINED,
145 TPM_UNDEFINED,
146 TPM_UNDEFINED,
147 TPM_SHORT, /* 70 */
148 TPM_SHORT,
149 TPM_UNDEFINED,
150 TPM_UNDEFINED,
151 TPM_UNDEFINED,
152 TPM_UNDEFINED, /* 75 */
153 TPM_UNDEFINED,
154 TPM_UNDEFINED,
155 TPM_UNDEFINED,
156 TPM_UNDEFINED,
157 TPM_LONG, /* 80 */
158 TPM_UNDEFINED,
159 TPM_MEDIUM,
160 TPM_LONG,
161 TPM_SHORT,
162 TPM_UNDEFINED, /* 85 */
163 TPM_UNDEFINED,
164 TPM_UNDEFINED,
165 TPM_UNDEFINED,
166 TPM_UNDEFINED,
167 TPM_SHORT, /* 90 */
168 TPM_SHORT,
169 TPM_SHORT,
170 TPM_SHORT,
171 TPM_SHORT,
172 TPM_UNDEFINED, /* 95 */
173 TPM_UNDEFINED,
174 TPM_UNDEFINED,
175 TPM_UNDEFINED,
176 TPM_UNDEFINED,
177 TPM_MEDIUM, /* 100 */
178 TPM_SHORT,
179 TPM_SHORT,
180 TPM_UNDEFINED,
181 TPM_UNDEFINED,
182 TPM_UNDEFINED, /* 105 */
183 TPM_UNDEFINED,
184 TPM_UNDEFINED,
185 TPM_UNDEFINED,
186 TPM_UNDEFINED,
187 TPM_SHORT, /* 110 */
188 TPM_SHORT,
189 TPM_SHORT,
190 TPM_SHORT,
191 TPM_SHORT,
192 TPM_SHORT, /* 115 */
193 TPM_SHORT,
194 TPM_SHORT,
195 TPM_UNDEFINED,
196 TPM_UNDEFINED,
197 TPM_LONG, /* 120 */
198 TPM_LONG,
199 TPM_MEDIUM,
200 TPM_UNDEFINED,
201 TPM_SHORT,
202 TPM_SHORT, /* 125 */
203 TPM_SHORT,
204 TPM_LONG,
205 TPM_SHORT,
206 TPM_SHORT,
207 TPM_SHORT, /* 130 */
208 TPM_MEDIUM,
209 TPM_UNDEFINED,
210 TPM_SHORT,
211 TPM_MEDIUM,
212 TPM_UNDEFINED, /* 135 */
213 TPM_UNDEFINED,
214 TPM_UNDEFINED,
215 TPM_UNDEFINED,
216 TPM_UNDEFINED,
217 TPM_SHORT, /* 140 */
218 TPM_SHORT,
219 TPM_UNDEFINED,
220 TPM_UNDEFINED,
221 TPM_UNDEFINED,
222 TPM_UNDEFINED, /* 145 */
223 TPM_UNDEFINED,
224 TPM_UNDEFINED,
225 TPM_UNDEFINED,
226 TPM_UNDEFINED,
227 TPM_SHORT, /* 150 */
228 TPM_MEDIUM,
229 TPM_MEDIUM,
230 TPM_SHORT,
231 TPM_SHORT,
232 TPM_UNDEFINED, /* 155 */
233 TPM_UNDEFINED,
234 TPM_UNDEFINED,
235 TPM_UNDEFINED,
236 TPM_UNDEFINED,
237 TPM_SHORT, /* 160 */
238 TPM_SHORT,
239 TPM_SHORT,
240 TPM_SHORT,
241 TPM_UNDEFINED,
242 TPM_UNDEFINED, /* 165 */
243 TPM_UNDEFINED,
244 TPM_UNDEFINED,
245 TPM_UNDEFINED,
246 TPM_UNDEFINED,
247 TPM_LONG, /* 170 */
248 TPM_UNDEFINED,
249 TPM_UNDEFINED,
250 TPM_UNDEFINED,
251 TPM_UNDEFINED,
252 TPM_UNDEFINED, /* 175 */
253 TPM_UNDEFINED,
254 TPM_UNDEFINED,
255 TPM_UNDEFINED,
256 TPM_UNDEFINED,
257 TPM_MEDIUM, /* 180 */
258 TPM_SHORT,
259 TPM_MEDIUM,
260 TPM_MEDIUM,
261 TPM_MEDIUM,
262 TPM_MEDIUM, /* 185 */
263 TPM_SHORT,
264 TPM_UNDEFINED,
265 TPM_UNDEFINED,
266 TPM_UNDEFINED,
267 TPM_UNDEFINED, /* 190 */
268 TPM_UNDEFINED,
269 TPM_UNDEFINED,
270 TPM_UNDEFINED,
271 TPM_UNDEFINED,
272 TPM_UNDEFINED, /* 195 */
273 TPM_UNDEFINED,
274 TPM_UNDEFINED,
275 TPM_UNDEFINED,
276 TPM_UNDEFINED,
277 TPM_SHORT, /* 200 */
278 TPM_UNDEFINED,
279 TPM_UNDEFINED,
280 TPM_UNDEFINED,
281 TPM_SHORT,
282 TPM_SHORT, /* 205 */
283 TPM_SHORT,
284 TPM_SHORT,
285 TPM_SHORT,
286 TPM_SHORT,
287 TPM_MEDIUM, /* 210 */
288 TPM_UNDEFINED,
289 TPM_MEDIUM,
290 TPM_MEDIUM,
291 TPM_MEDIUM,
292 TPM_UNDEFINED, /* 215 */
293 TPM_MEDIUM,
294 TPM_UNDEFINED,
295 TPM_UNDEFINED,
296 TPM_SHORT,
297 TPM_SHORT, /* 220 */
298 TPM_SHORT,
299 TPM_SHORT,
300 TPM_SHORT,
301 TPM_SHORT,
302 TPM_UNDEFINED, /* 225 */
303 TPM_UNDEFINED,
304 TPM_UNDEFINED,
305 TPM_UNDEFINED,
306 TPM_UNDEFINED,
307 TPM_SHORT, /* 230 */
308 TPM_LONG,
309 TPM_MEDIUM,
310 TPM_UNDEFINED,
311 TPM_UNDEFINED,
312 TPM_UNDEFINED, /* 235 */
313 TPM_UNDEFINED,
314 TPM_UNDEFINED,
315 TPM_UNDEFINED,
316 TPM_UNDEFINED,
317 TPM_SHORT, /* 240 */
318 TPM_UNDEFINED,
319 TPM_MEDIUM,
320};
321
1da177e4
LT		 322static void user_reader_timeout(unsigned long ptr)
323{
324 struct tpm_chip *chip = (struct tpm_chip *) ptr;
325
09e12f9f
KJH		 326 schedule_work(&chip->work);
327}
328
c4028958 329static void timeout_work(struct work_struct *work)
09e12f9f 330{
c4028958 331 struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
09e12f9f 332
d081d470 333 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 334 atomic_set(&chip->data_pending, 0);
335 memset(chip->data_buffer, 0, TPM_BUFSIZE);
d081d470 336 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 337}
338
9e18ee19
KJH		 339/*
340 * Returns max number of jiffies to wait
341 */
342unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
343 u32 ordinal)
344{
345 int duration_idx = TPM_UNDEFINED;
346 int duration = 0;
347
348 if (ordinal < TPM_MAX_ORDINAL)
349 duration_idx = tpm_ordinal_duration[ordinal];
350 else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
351 TPM_MAX_PROTECTED_ORDINAL)
352 duration_idx =
353 tpm_protected_ordinal_duration[ordinal &
354 TPM_PROTECTED_ORDINAL_MASK];
355
356 if (duration_idx != TPM_UNDEFINED)
36b20020 357 duration = chip->vendor.duration[duration_idx];
9e18ee19
KJH		 358 if (duration <= 0)
359 return 2 * 60 * HZ;
360 else
361 return duration;
362}
363EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
364
1da177e4
LT		 365/*
366 * Internal kernel interface to transmit TPM commands
367 */
368static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
369 size_t bufsiz)
370{
d9e5b6bf 371 ssize_t rc;
9e18ee19 372 u32 count, ordinal;
700d8bdc 373 unsigned long stop;
1da177e4 374
81179bb6 375 count = be32_to_cpu(*((__be32 *) (buf + 2)));
9e18ee19 376 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
1da177e4
LT		 377 if (count == 0)
378 return -ENODATA;
379 if (count > bufsiz) {
e659a3fe 380 dev_err(chip->dev,
b76be681 381 "invalid count value %x %zx \n", count, bufsiz);
1da177e4
LT		 382 return -E2BIG;
383 }
384
d081d470 385 mutex_lock(&chip->tpm_mutex);
1da177e4 386
90dda520 387 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
e659a3fe 388 dev_err(chip->dev,
d9e5b6bf
KH		 389 "tpm_transmit: tpm_send: error %zd\n", rc);
390 goto out;
1da177e4
LT		 391 }
392
27084efe
LD		 393 if (chip->vendor.irq)
394 goto out_recv;
395
9e18ee19 396 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
1da177e4 397 do {
90dda520
KJH		 398 u8 status = chip->vendor.status(chip);
399 if ((status & chip->vendor.req_complete_mask) ==
400 chip->vendor.req_complete_val)
1da177e4 401 goto out_recv;
d9e5b6bf 402
90dda520 403 if ((status == chip->vendor.req_canceled)) {
e659a3fe 404 dev_err(chip->dev, "Operation Canceled\n");
d9e5b6bf
KH		 405 rc = -ECANCELED;
406 goto out;
407 }
408
409 msleep(TPM_TIMEOUT); /* CHECK */
1da177e4 410 rmb();
700d8bdc 411 } while (time_before(jiffies, stop));
1da177e4 412
90dda520 413 chip->vendor.cancel(chip);
e659a3fe 414 dev_err(chip->dev, "Operation Timed out\n");
d9e5b6bf
KH		 415 rc = -ETIME;
416 goto out;
1da177e4
LT		 417
418out_recv:
90dda520 419 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
d9e5b6bf 420 if (rc < 0)
e659a3fe 421 dev_err(chip->dev,
d9e5b6bf
KH		 422 "tpm_transmit: tpm_recv: error %zd\n", rc);
423out:
d081d470 424 mutex_unlock(&chip->tpm_mutex);
d9e5b6bf 425 return rc;
1da177e4
LT		 426}
427
428#define TPM_DIGEST_SIZE 20
beed53a1
KJH		 429#define TPM_ERROR_SIZE 10
430#define TPM_RET_CODE_IDX 6
beed53a1
KJH		 431
432enum tpm_capabilities {
08837438
RA		 433 TPM_CAP_FLAG = cpu_to_be32(4),
434 TPM_CAP_PROP = cpu_to_be32(5),
435 CAP_VERSION_1_1 = cpu_to_be32(0x06),
436 CAP_VERSION_1_2 = cpu_to_be32(0x1A)
beed53a1
KJH		 437};
438
439enum tpm_sub_capabilities {
08837438
RA		 440 TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
441 TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
442 TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
443 TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
444 TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
445 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
446 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
beed53a1 447
1da177e4
LT		 448};
449
08837438
RA		 450static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
451 int len, const char *desc)
beed53a1
KJH		 452{
453 int err;
454
08837438 455 len = tpm_transmit(chip,(u8 *) cmd, len);
beed53a1
KJH		 456 if (len < 0)
457 return len;
458 if (len == TPM_ERROR_SIZE) {
08837438 459 err = be32_to_cpu(cmd->header.out.return_code);
beed53a1
KJH		 460 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
461 return err;
462 }
463 return 0;
464}
465
08837438
RA		 466#define TPM_INTERNAL_RESULT_SIZE 200
467#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
468#define TPM_ORD_GET_CAP cpu_to_be32(101)
469
470static const struct tpm_input_header tpm_getcap_header = {
471 .tag = TPM_TAG_RQU_COMMAND,
472 .length = cpu_to_be32(22),
473 .ordinal = TPM_ORD_GET_CAP
474};
475
476ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
477 const char *desc)
478{
479 struct tpm_cmd_t tpm_cmd;
480 int rc;
481 struct tpm_chip *chip = dev_get_drvdata(dev);
482
483 tpm_cmd.header.in = tpm_getcap_header;
484 if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
485 tpm_cmd.params.getcap_in.cap = subcap_id;
486 /*subcap field not necessary */
487 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
488 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
489 } else {
490 if (subcap_id == TPM_CAP_FLAG_PERM ||
491 subcap_id == TPM_CAP_FLAG_VOL)
492 tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
493 else
494 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
495 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
496 tpm_cmd.params.getcap_in.subcap = subcap_id;
497 }
498 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
499 if (!rc)
500 *cap = tpm_cmd.params.getcap_out.cap;
501 return rc;
502}
503
08e96e48
KJH		 504void tpm_gen_interrupt(struct tpm_chip *chip)
505{
08837438 506 struct tpm_cmd_t tpm_cmd;
08e96e48
KJH		 507 ssize_t rc;
508
08837438
RA		 509 tpm_cmd.header.in = tpm_getcap_header;
510 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
511 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
512 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 513
08837438 514 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 515 "attempting to determine the timeouts");
516}
517EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
518
519void tpm_get_timeouts(struct tpm_chip *chip)
520{
08837438
RA		 521 struct tpm_cmd_t tpm_cmd;
522 struct timeout_t *timeout_cap;
523 struct duration_t *duration_cap;
08e96e48
KJH		 524 ssize_t rc;
525 u32 timeout;
526
08837438
RA		 527 tpm_cmd.header.in = tpm_getcap_header;
528 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
529 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
530 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 531
08837438 532 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 533 "attempting to determine the timeouts");
534 if (rc)
535 goto duration;
536
08837438 537 if (be32_to_cpu(tpm_cmd.header.out.length)
08e96e48
KJH		 538 != 4 * sizeof(u32))
539 goto duration;
540
08837438 541 timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
08e96e48 542 /* Don't overwrite default if value is 0 */
08837438 543 timeout = be32_to_cpu(timeout_cap->a);
08e96e48 544 if (timeout)
9e5b1b12 545 chip->vendor.timeout_a = usecs_to_jiffies(timeout);
08837438 546 timeout = be32_to_cpu(timeout_cap->b);
08e96e48 547 if (timeout)
9e5b1b12 548 chip->vendor.timeout_b = usecs_to_jiffies(timeout);
08837438 549 timeout = be32_to_cpu(timeout_cap->c);
08e96e48 550 if (timeout)
9e5b1b12 551 chip->vendor.timeout_c = usecs_to_jiffies(timeout);
08837438 552 timeout = be32_to_cpu(timeout_cap->d);
08e96e48 553 if (timeout)
9e5b1b12 554 chip->vendor.timeout_d = usecs_to_jiffies(timeout);
08e96e48
KJH		 555
556duration:
08837438
RA		 557 tpm_cmd.header.in = tpm_getcap_header;
558 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
559 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
560 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
08e96e48 561
08837438 562 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 563 "attempting to determine the durations");
564 if (rc)
565 return;
566
08837438 567 if (be32_to_cpu(tpm_cmd.header.out.return_code)
08e96e48
KJH		 568 != 3 * sizeof(u32))
569 return;
08837438 570 duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
08e96e48 571 chip->vendor.duration[TPM_SHORT] =
08837438 572 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
292cf4a8
VK		 573 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
574 * value wrong and apparently reports msecs rather than usecs. So we
575 * fix up the resulting too-small TPM_SHORT value to make things work.
576 */
577 if (chip->vendor.duration[TPM_SHORT] < (HZ/100))
578 chip->vendor.duration[TPM_SHORT] = HZ;
579
08e96e48 580 chip->vendor.duration[TPM_MEDIUM] =
08837438 581 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
08e96e48 582 chip->vendor.duration[TPM_LONG] =
08837438 583 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
08e96e48
KJH		 584}
585EXPORT_SYMBOL_GPL(tpm_get_timeouts);
586
587void tpm_continue_selftest(struct tpm_chip *chip)
588{
589 u8 data[] = {
590 0, 193, /* TPM_TAG_RQU_COMMAND */
591 0, 0, 0, 10, /* length */
592 0, 0, 0, 83, /* TPM_ORD_GetCapability */
593 };
594
595 tpm_transmit(chip, data, sizeof(data));
596}
597EXPORT_SYMBOL_GPL(tpm_continue_selftest);
598
599ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
600 char *buf)
601{
08837438 602 cap_t cap;
08e96e48
KJH		 603 ssize_t rc;
604
08837438
RA		 605 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
606 "attempting to determine the permanent enabled state");
607 if (rc)
08e96e48 608 return 0;
ec288bd3 609
08837438 610 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
ec288bd3 611 return rc;
08e96e48
KJH		 612}
613EXPORT_SYMBOL_GPL(tpm_show_enabled);
614
615ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
616 char *buf)
617{
08837438 618 cap_t cap;
08e96e48
KJH		 619 ssize_t rc;
620
08837438
RA		 621 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
622 "attempting to determine the permanent active state");
623 if (rc)
08e96e48 624 return 0;
ec288bd3 625
08837438 626 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
ec288bd3 627 return rc;
08e96e48
KJH		 628}
629EXPORT_SYMBOL_GPL(tpm_show_active);
630
631ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
632 char *buf)
633{
08837438 634 cap_t cap;
08e96e48
KJH		 635 ssize_t rc;
636
08837438
RA		 637 rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
638 "attempting to determine the owner state");
639 if (rc)
08e96e48 640 return 0;
ec288bd3 641
08837438 642 rc = sprintf(buf, "%d\n", cap.owned);
ec288bd3 643 return rc;
08e96e48
KJH		 644}
645EXPORT_SYMBOL_GPL(tpm_show_owned);
646
647ssize_t tpm_show_temp_deactivated(struct device * dev,
648 struct device_attribute * attr, char *buf)
649{
08837438 650 cap_t cap;
08e96e48
KJH		 651 ssize_t rc;
652
08837438
RA		 653 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
654 "attempting to determine the temporary state");
655 if (rc)
08e96e48 656 return 0;
ec288bd3 657
08837438 658 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
ec288bd3 659 return rc;
08e96e48
KJH		 660}
661EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
662
659aaf2b
RA		 663/*
664 * tpm_chip_find_get - return tpm_chip for given chip number
665 */
666static struct tpm_chip *tpm_chip_find_get(int chip_num)
667{
8920d5ad 668 struct tpm_chip *pos, *chip = NULL;
659aaf2b
RA		 669
670 rcu_read_lock();
671 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
672 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
673 continue;
674
8920d5ad
RA		 675 if (try_module_get(pos->dev->driver->owner)) {
676 chip = pos;
659aaf2b 677 break;
8920d5ad 678 }
659aaf2b
RA		 679 }
680 rcu_read_unlock();
8920d5ad 681 return chip;
659aaf2b
RA		 682}
683
684#define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
685#define READ_PCR_RESULT_SIZE 30
686static struct tpm_input_header pcrread_header = {
687 .tag = TPM_TAG_RQU_COMMAND,
688 .length = cpu_to_be32(14),
689 .ordinal = TPM_ORDINAL_PCRREAD
1da177e4
LT		 690};
691
659aaf2b
RA		 692int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
693{
694 int rc;
695 struct tpm_cmd_t cmd;
696
697 cmd.header.in = pcrread_header;
698 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
8c87df45 699 BUG_ON(cmd.header.in.length > READ_PCR_RESULT_SIZE);
659aaf2b
RA		 700 rc = transmit_cmd(chip, &cmd, cmd.header.in.length,
701 "attempting to read a pcr value");
702
703 if (rc == 0)
704 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
705 TPM_DIGEST_SIZE);
706 return rc;
707}
708
709/**
710 * tpm_pcr_read - read a pcr value
711 * @chip_num: tpm idx # or ANY
712 * @pcr_idx: pcr idx to retrieve
713 * @res_buf: TPM_PCR value
714 * size of res_buf is 20 bytes (or NULL if you don't care)
715 *
716 * The TPM driver should be built-in, but for whatever reason it
717 * isn't, protect against the chip disappearing, by incrementing
718 * the module usage count.
719 */
720int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
721{
722 struct tpm_chip *chip;
723 int rc;
724
725 chip = tpm_chip_find_get(chip_num);
726 if (chip == NULL)
727 return -ENODEV;
728 rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
729 module_put(chip->dev->driver->owner);
730 return rc;
731}
732EXPORT_SYMBOL_GPL(tpm_pcr_read);
733
734/**
735 * tpm_pcr_extend - extend pcr value with hash
736 * @chip_num: tpm idx # or AN&
737 * @pcr_idx: pcr idx to extend
738 * @hash: hash value used to extend pcr value
739 *
740 * The TPM driver should be built-in, but for whatever reason it
741 * isn't, protect against the chip disappearing, by incrementing
742 * the module usage count.
743 */
744#define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
0afd9056 745#define EXTEND_PCR_RESULT_SIZE 34
659aaf2b
RA		 746static struct tpm_input_header pcrextend_header = {
747 .tag = TPM_TAG_RQU_COMMAND,
748 .length = cpu_to_be32(34),
749 .ordinal = TPM_ORD_PCR_EXTEND
750};
751
752int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
753{
754 struct tpm_cmd_t cmd;
755 int rc;
756 struct tpm_chip *chip;
757
758 chip = tpm_chip_find_get(chip_num);
759 if (chip == NULL)
760 return -ENODEV;
761
762 cmd.header.in = pcrextend_header;
659aaf2b
RA		 763 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
764 memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
0afd9056 765 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
659aaf2b
RA		 766 "attempting extend a PCR value");
767
768 module_put(chip->dev->driver->owner);
769 return rc;
770}
771EXPORT_SYMBOL_GPL(tpm_pcr_extend);
772
6659ca2a
KH		 773ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
774 char *buf)
1da177e4 775{
08837438 776 cap_t cap;
659aaf2b 777 u8 digest[TPM_DIGEST_SIZE];
beed53a1 778 ssize_t rc;
81179bb6 779 int i, j, num_pcrs;
1da177e4 780 char *str = buf;
e659a3fe 781 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 782
08837438 783 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
beed53a1 784 "attempting to determine the number of PCRS");
08837438 785 if (rc)
e234bc97 786 return 0;
1da177e4 787
08837438 788 num_pcrs = be32_to_cpu(cap.num_pcrs);
1da177e4 789 for (i = 0; i < num_pcrs; i++) {
659aaf2b 790 rc = __tpm_pcr_read(chip, i, digest);
beed53a1 791 if (rc)
08837438 792 break;
1da177e4
LT		 793 str += sprintf(str, "PCR-%02d: ", i);
794 for (j = 0; j < TPM_DIGEST_SIZE; j++)
659aaf2b 795 str += sprintf(str, "%02X ", digest[j]);
1da177e4
LT		 796 str += sprintf(str, "\n");
797 }
798 return str - buf;
799}
6659ca2a 800EXPORT_SYMBOL_GPL(tpm_show_pcrs);
1da177e4
LT		 801
802#define READ_PUBEK_RESULT_SIZE 314
08837438
RA		 803#define TPM_ORD_READPUBEK cpu_to_be32(124)
804struct tpm_input_header tpm_readpubek_header = {
805 .tag = TPM_TAG_RQU_COMMAND,
806 .length = cpu_to_be32(30),
807 .ordinal = TPM_ORD_READPUBEK
1da177e4
LT		 808};
809
6659ca2a
KH		 810ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
811 char *buf)
1da177e4 812{
2df7111f 813 u8 *data;
08837438 814 struct tpm_cmd_t tpm_cmd;
beed53a1 815 ssize_t err;
81179bb6 816 int i, rc;
1da177e4
LT		 817 char *str = buf;
818
e659a3fe 819 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 820
08837438
RA		 821 tpm_cmd.header.in = tpm_readpubek_header;
822 err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
beed53a1
KJH		 823 "attempting to read the PUBEK");
824 if (err)
34d6e075 825 goto out;
1da177e4
LT		 826
827 /*
828 ignore header 10 bytes
829 algorithm 32 bits (1 == RSA )
830 encscheme 16 bits
831 sigscheme 16 bits
832 parameters (RSA 12->bytes: keybit, #primes, expbit)
833 keylenbytes 32 bits
834 256 byte modulus
835 ignore checksum 20 bytes
836 */
08837438 837 data = tpm_cmd.params.readpubek_out_buffer;
1da177e4
LT		 838 str +=
839 sprintf(str,
840 "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
841 "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
842 " %02X %02X %02X %02X %02X %02X %02X %02X\n"
843 "Modulus length: %d\nModulus: \n",
844 data[10], data[11], data[12], data[13], data[14],
845 data[15], data[16], data[17], data[22], data[23],
846 data[24], data[25], data[26], data[27], data[28],
847 data[29], data[30], data[31], data[32], data[33],
1dda8abe 848 be32_to_cpu(*((__be32 *) (data + 34))));
1da177e4
LT		 849
850 for (i = 0; i < 256; i++) {
1dda8abe 851 str += sprintf(str, "%02X ", data[i + 38]);
1da177e4
LT		 852 if ((i + 1) % 16 == 0)
853 str += sprintf(str, "\n");
854 }
34d6e075 855out:
beed53a1 856 rc = str - buf;
2df7111f 857 return rc;
1da177e4 858}
6659ca2a 859EXPORT_SYMBOL_GPL(tpm_show_pubek);
1da177e4 860
1da177e4 861
6659ca2a
KH		 862ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
863 char *buf)
1da177e4 864{
08837438 865 cap_t cap;
beed53a1 866 ssize_t rc;
1da177e4
LT		 867 char *str = buf;
868
08837438 869 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
beed53a1 870 "attempting to determine the manufacturer");
08837438 871 if (rc)
beed53a1 872 return 0;
1da177e4 873 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438 874 be32_to_cpu(cap.manufacturer_id));
1da177e4 875
08837438
RA		 876 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
877 "attempting to determine the 1.1 version");
beed53a1 878 if (rc)
08837438 879 return 0;
beed53a1
KJH		 880 str += sprintf(str,
881 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 882 cap.tpm_version.Major, cap.tpm_version.Minor,
883 cap.tpm_version.revMajor, cap.tpm_version.revMinor);
1da177e4
LT		 884 return str - buf;
885}
6659ca2a
KH		 886EXPORT_SYMBOL_GPL(tpm_show_caps);
887
08e96e48
KJH		 888ssize_t tpm_show_caps_1_2(struct device * dev,
889 struct device_attribute * attr, char *buf)
890{
08837438
RA		 891 cap_t cap;
892 ssize_t rc;
08e96e48
KJH		 893 char *str = buf;
894
08837438
RA		 895 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
896 "attempting to determine the manufacturer");
897 if (rc)
08e96e48 898 return 0;
08e96e48 899 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438
RA		 900 be32_to_cpu(cap.manufacturer_id));
901 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
902 "attempting to determine the 1.2 version");
903 if (rc)
904 return 0;
08e96e48
KJH		 905 str += sprintf(str,
906 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 907 cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
908 cap.tpm_version_1_2.revMajor,
909 cap.tpm_version_1_2.revMinor);
08e96e48
KJH		 910 return str - buf;
911}
912EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
913
6659ca2a
KH		 914ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
915 const char *buf, size_t count)
916{
917 struct tpm_chip *chip = dev_get_drvdata(dev);
918 if (chip == NULL)
919 return 0;
920
90dda520 921 chip->vendor.cancel(chip);
6659ca2a
KH		 922 return count;
923}
924EXPORT_SYMBOL_GPL(tpm_store_cancel);
1da177e4 925
1da177e4
LT		 926/*
927 * Device file system interface to the TPM
f89c5edb
RA		 928 *
929 * It's assured that the chip will be opened just once,
930 * by the check of is_open variable, which is protected
931 * by driver_lock.
1da177e4
LT		 932 */
933int tpm_open(struct inode *inode, struct file *file)
934{
f02a9364 935 int minor = iminor(inode);
1da177e4
LT		 936 struct tpm_chip *chip = NULL, *pos;
937
f02a9364
RA		 938 rcu_read_lock();
939 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
90dda520 940 if (pos->vendor.miscdev.minor == minor) {
1da177e4 941 chip = pos;
f02a9364 942 get_device(chip->dev);
1da177e4
LT		 943 break;
944 }
945 }
f02a9364 946 rcu_read_unlock();
1da177e4 947
f02a9364
RA		 948 if (!chip)
949 return -ENODEV;
1da177e4 950
dc36d32c 951 if (test_and_set_bit(0, &chip->is_open)) {
b888c87b 952 dev_dbg(chip->dev, "Another process owns this TPM\n");
f02a9364
RA		 953 put_device(chip->dev);
954 return -EBUSY;
1da177e4
LT		 955 }
956
1da177e4
LT		 957 chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
958 if (chip->data_buffer == NULL) {
dc36d32c 959 clear_bit(0, &chip->is_open);
e659a3fe 960 put_device(chip->dev);
1da177e4
LT		 961 return -ENOMEM;
962 }
963
964 atomic_set(&chip->data_pending, 0);
965
966 file->private_data = chip;
967 return 0;
1da177e4 968}
1da177e4
LT		 969EXPORT_SYMBOL_GPL(tpm_open);
970
f02a9364
RA		 971/*
972 * Called on file close
973 */
1da177e4
LT		 974int tpm_release(struct inode *inode, struct file *file)
975{
976 struct tpm_chip *chip = file->private_data;
1da177e4 977
4bdec11f 978 del_singleshot_timer_sync(&chip->user_read_timer);
8e39c933 979 flush_scheduled_work();
5e976d55 980 file->private_data = NULL;
1da177e4 981 atomic_set(&chip->data_pending, 0);
f02a9364 982 kfree(chip->data_buffer);
dc36d32c 983 clear_bit(0, &chip->is_open);
e659a3fe 984 put_device(chip->dev);
1da177e4
LT		 985 return 0;
986}
1da177e4
LT		 987EXPORT_SYMBOL_GPL(tpm_release);
988
b888c87b 989ssize_t tpm_write(struct file *file, const char __user *buf,
3c2f606a 990 size_t size, loff_t *off)
1da177e4
LT		 991{
992 struct tpm_chip *chip = file->private_data;
01476001 993 size_t in_size = size, out_size;
1da177e4
LT		 994
995 /* cannot perform a write until the read has cleared
996 either via tpm_read or a user_read_timer timeout */
700d8bdc
NA		 997 while (atomic_read(&chip->data_pending) != 0)
998 msleep(TPM_TIMEOUT);
1da177e4 999
d081d470 1000 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 1001
1002 if (in_size > TPM_BUFSIZE)
1003 in_size = TPM_BUFSIZE;
1004
1005 if (copy_from_user
1006 (chip->data_buffer, (void __user *) buf, in_size)) {
d081d470 1007 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1008 return -EFAULT;
1009 }
1010
1011 /* atomic tpm command send and result receive */
1012 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1013
1014 atomic_set(&chip->data_pending, out_size);
d081d470 1015 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1016
1017 /* Set a timeout by which the reader must come claim the result */
fe3fd483 1018 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1da177e4
LT		 1019
1020 return in_size;
1021}
1da177e4
LT		 1022EXPORT_SYMBOL_GPL(tpm_write);
1023
3c2f606a
KJH		 1024ssize_t tpm_read(struct file *file, char __user *buf,
1025 size_t size, loff_t *off)
1da177e4
LT		 1026{
1027 struct tpm_chip *chip = file->private_data;
01476001 1028 ssize_t ret_size;
1da177e4 1029
5b44bd58 1030 del_singleshot_timer_sync(&chip->user_read_timer);
ba396115 1031 flush_scheduled_work();
5b44bd58
KH		 1032 ret_size = atomic_read(&chip->data_pending);
1033 atomic_set(&chip->data_pending, 0);
1034 if (ret_size > 0) { /* relay data */
1035 if (size < ret_size)
1036 ret_size = size;
1da177e4 1037
d081d470 1038 mutex_lock(&chip->buffer_mutex);
f6a2382c 1039 if (copy_to_user(buf, chip->data_buffer, ret_size))
5b44bd58 1040 ret_size = -EFAULT;
d081d470 1041 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1042 }
1043
1044 return ret_size;
1045}
1da177e4
LT		 1046EXPORT_SYMBOL_GPL(tpm_read);
1047
e659a3fe 1048void tpm_remove_hardware(struct device *dev)
1da177e4 1049{
e659a3fe 1050 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1051
1052 if (chip == NULL) {
e659a3fe 1053 dev_err(dev, "No device data found\n");
1da177e4
LT		 1054 return;
1055 }
1056
1057 spin_lock(&driver_lock);
f02a9364 1058 list_del_rcu(&chip->list);
1da177e4 1059 spin_unlock(&driver_lock);
f02a9364 1060 synchronize_rcu();
1da177e4 1061
90dda520 1062 misc_deregister(&chip->vendor.miscdev);
90dda520 1063 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
55a82ab3 1064 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1065
5bd91f18
RM		 1066 /* write it this way to be explicit (chip->dev == dev) */
1067 put_device(chip->dev);
1da177e4 1068}
e659a3fe 1069EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4 1070
1da177e4
LT		 1071/*
1072 * We are about to suspend. Save the TPM state
1073 * so that it can be restored.
1074 */
ce2c87d4 1075int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1da177e4 1076{
ce2c87d4 1077 struct tpm_chip *chip = dev_get_drvdata(dev);
2490c681
DS		 1078 u8 savestate[] = {
1079 0, 193, /* TPM_TAG_RQU_COMMAND */
1080 0, 0, 0, 10, /* blob length (in bytes) */
1081 0, 0, 0, 152 /* TPM_ORD_SaveState */
1082 };
1083
1da177e4
LT		 1084 if (chip == NULL)
1085 return -ENODEV;
1086
1087 tpm_transmit(chip, savestate, sizeof(savestate));
1088 return 0;
1089}
1da177e4
LT		 1090EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1091
1092/*
1093 * Resume from a power safe. The BIOS already restored
1094 * the TPM state.
1095 */
ce2c87d4 1096int tpm_pm_resume(struct device *dev)
1da177e4 1097{
ce2c87d4 1098 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1099
1100 if (chip == NULL)
1101 return -ENODEV;
1102
1da177e4
LT		 1103 return 0;
1104}
1da177e4
LT		 1105EXPORT_SYMBOL_GPL(tpm_pm_resume);
1106
253115b7
RA		 1107/* In case vendor provided release function, call it too.*/
1108
1109void tpm_dev_vendor_release(struct tpm_chip *chip)
1110{
1111 if (chip->vendor.release)
1112 chip->vendor.release(chip->dev);
1113
1114 clear_bit(chip->dev_num, dev_mask);
1115 kfree(chip->vendor.miscdev.name);
1116}
1117EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1118
1119
5bd91f18
RM		 1120/*
1121 * Once all references to platform device are down to 0,
1122 * release all allocated structures.
5bd91f18 1123 */
cbb2ed4a 1124void tpm_dev_release(struct device *dev)
5bd91f18
RM		 1125{
1126 struct tpm_chip *chip = dev_get_drvdata(dev);
1127
253115b7 1128 tpm_dev_vendor_release(chip);
5bd91f18 1129
253115b7 1130 chip->release(dev);
5bd91f18
RM		 1131 kfree(chip);
1132}
253115b7 1133EXPORT_SYMBOL_GPL(tpm_dev_release);
5bd91f18 1134
1da177e4
LT		 1135/*
1136 * Called from tpm_<specific>.c probe function only for devices
1137 * the driver has determined it should claim. Prior to calling
1138 * this function the specific probe function has called pci_enable_device
1139 * upon errant exit from this function specific probe function should call
1140 * pci_disable_device
1141 */
f02a9364
RA		 1142struct tpm_chip *tpm_register_hardware(struct device *dev,
1143 const struct tpm_vendor_specific *entry)
1da177e4 1144{
6f9beccb
KJH		 1145#define DEVNAME_SIZE 7
1146
1147 char *devname;
1da177e4 1148 struct tpm_chip *chip;
1da177e4
LT		 1149
1150 /* Driver specific per-device data */
b888c87b 1151 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
8e39c933
PW		 1152 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1153
dd78c943
AM		 1154 if (chip == NULL || devname == NULL)
1155 goto out_free;
1da177e4 1156
d081d470
MK		 1157 mutex_init(&chip->buffer_mutex);
1158 mutex_init(&chip->tpm_mutex);
1da177e4
LT		 1159 INIT_LIST_HEAD(&chip->list);
1160
c4028958 1161 INIT_WORK(&chip->work, timeout_work);
09e12f9f 1162
40565f19
JS		 1163 setup_timer(&chip->user_read_timer, user_reader_timeout,
1164 (unsigned long)chip);
fe3fd483 1165
90dda520 1166 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4 1167
10685a95 1168 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1da177e4 1169
10685a95 1170 if (chip->dev_num >= TPM_NUM_DEVICES) {
b888c87b 1171 dev_err(dev, "No available tpm device numbers\n");
dd78c943 1172 goto out_free;
1da177e4 1173 } else if (chip->dev_num == 0)
90dda520 1174 chip->vendor.miscdev.minor = TPM_MINOR;
1da177e4 1175 else
90dda520 1176 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1da177e4 1177
10685a95
KJH		 1178 set_bit(chip->dev_num, dev_mask);
1179
6f9beccb 1180 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
90dda520 1181 chip->vendor.miscdev.name = devname;
1da177e4 1182
94fbcded 1183 chip->vendor.miscdev.parent = dev;
e659a3fe 1184 chip->dev = get_device(dev);
5bd91f18
RM		 1185 chip->release = dev->release;
1186 dev->release = tpm_dev_release;
1187 dev_set_drvdata(dev, chip);
1da177e4 1188
90dda520 1189 if (misc_register(&chip->vendor.miscdev)) {
e659a3fe 1190 dev_err(chip->dev,
1da177e4 1191 "unable to misc_register %s, minor %d\n",
90dda520
KJH		 1192 chip->vendor.miscdev.name,
1193 chip->vendor.miscdev.minor);
5bd91f18 1194 put_device(chip->dev);
e0dd03ca 1195 return NULL;
1da177e4
LT		 1196 }
1197
f33d9bd5 1198 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
5d469ec0 1199 misc_deregister(&chip->vendor.miscdev);
5bd91f18 1200 put_device(chip->dev);
f02a9364 1201
f33d9bd5
JG		 1202 return NULL;
1203 }
1da177e4 1204
55a82ab3
KJH		 1205 chip->bios_dir = tpm_bios_log_setup(devname);
1206
f02a9364
RA		 1207 /* Make chip available */
1208 spin_lock(&driver_lock);
1209 list_add_rcu(&chip->list, &tpm_chip_list);
1210 spin_unlock(&driver_lock);
1211
e0dd03ca 1212 return chip;
dd78c943
AM		 1213
1214out_free:
1215 kfree(chip);
1216 kfree(devname);
1217 return NULL;
1da177e4 1218}
1da177e4
LT		 1219EXPORT_SYMBOL_GPL(tpm_register_hardware);
1220
1da177e4
LT		 1221MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1222MODULE_DESCRIPTION("TPM Driver");
1223MODULE_VERSION("2.0");
1224MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)