projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[PATCH] VFS: extra check inside dentry_unhash()
[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 *
10 * Maintained by: <tpmdd_devel@lists.sourceforge.net>
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
26#include <linux/sched.h>
27#include <linux/poll.h>
28#include <linux/spinlock.h>
29#include "tpm.h"
30
3122a88a
KH		 31enum tpm_const {
32 TPM_MINOR = 224, /* officially assigned */
33 TPM_BUFSIZE = 2048,
34 TPM_NUM_DEVICES = 256,
3122a88a 35};
1da177e4 36
9e18ee19
KJH		 37enum tpm_duration {
38 TPM_SHORT = 0,
39 TPM_MEDIUM = 1,
40 TPM_LONG = 2,
41 TPM_UNDEFINED,
42};
43
44#define TPM_MAX_ORDINAL 243
45#define TPM_MAX_PROTECTED_ORDINAL 12
46#define TPM_PROTECTED_ORDINAL_MASK 0xFF
47
1da177e4
LT		 48static LIST_HEAD(tpm_chip_list);
49static DEFINE_SPINLOCK(driver_lock);
10685a95 50static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
1da177e4 51
9e18ee19
KJH		 52/*
53 * Array with one entry per ordinal defining the maximum amount
54 * of time the chip could take to return the result. The ordinal
55 * designation of short, medium or long is defined in a table in
56 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
57 * values of the SHORT, MEDIUM, and LONG durations are retrieved
58 * from the chip during initialization with a call to tpm_get_timeouts.
59 */
60static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
61 TPM_UNDEFINED, /* 0 */
62 TPM_UNDEFINED,
63 TPM_UNDEFINED,
64 TPM_UNDEFINED,
65 TPM_UNDEFINED,
66 TPM_UNDEFINED, /* 5 */
67 TPM_UNDEFINED,
68 TPM_UNDEFINED,
69 TPM_UNDEFINED,
70 TPM_UNDEFINED,
71 TPM_SHORT, /* 10 */
72 TPM_SHORT,
73};
74
75static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
76 TPM_UNDEFINED, /* 0 */
77 TPM_UNDEFINED,
78 TPM_UNDEFINED,
79 TPM_UNDEFINED,
80 TPM_UNDEFINED,
81 TPM_UNDEFINED, /* 5 */
82 TPM_UNDEFINED,
83 TPM_UNDEFINED,
84 TPM_UNDEFINED,
85 TPM_UNDEFINED,
86 TPM_SHORT, /* 10 */
87 TPM_SHORT,
88 TPM_MEDIUM,
89 TPM_LONG,
90 TPM_LONG,
91 TPM_MEDIUM, /* 15 */
92 TPM_SHORT,
93 TPM_SHORT,
94 TPM_MEDIUM,
95 TPM_LONG,
96 TPM_SHORT, /* 20 */
97 TPM_SHORT,
98 TPM_MEDIUM,
99 TPM_MEDIUM,
100 TPM_MEDIUM,
101 TPM_SHORT, /* 25 */
102 TPM_SHORT,
103 TPM_MEDIUM,
104 TPM_SHORT,
105 TPM_SHORT,
106 TPM_MEDIUM, /* 30 */
107 TPM_LONG,
108 TPM_MEDIUM,
109 TPM_SHORT,
110 TPM_SHORT,
111 TPM_SHORT, /* 35 */
112 TPM_MEDIUM,
113 TPM_MEDIUM,
114 TPM_UNDEFINED,
115 TPM_UNDEFINED,
116 TPM_MEDIUM, /* 40 */
117 TPM_LONG,
118 TPM_MEDIUM,
119 TPM_SHORT,
120 TPM_SHORT,
121 TPM_SHORT, /* 45 */
122 TPM_SHORT,
123 TPM_SHORT,
124 TPM_SHORT,
125 TPM_LONG,
126 TPM_MEDIUM, /* 50 */
127 TPM_MEDIUM,
128 TPM_UNDEFINED,
129 TPM_UNDEFINED,
130 TPM_UNDEFINED,
131 TPM_UNDEFINED, /* 55 */
132 TPM_UNDEFINED,
133 TPM_UNDEFINED,
134 TPM_UNDEFINED,
135 TPM_UNDEFINED,
136 TPM_MEDIUM, /* 60 */
137 TPM_MEDIUM,
138 TPM_MEDIUM,
139 TPM_SHORT,
140 TPM_SHORT,
141 TPM_MEDIUM, /* 65 */
142 TPM_UNDEFINED,
143 TPM_UNDEFINED,
144 TPM_UNDEFINED,
145 TPM_UNDEFINED,
146 TPM_SHORT, /* 70 */
147 TPM_SHORT,
148 TPM_UNDEFINED,
149 TPM_UNDEFINED,
150 TPM_UNDEFINED,
151 TPM_UNDEFINED, /* 75 */
152 TPM_UNDEFINED,
153 TPM_UNDEFINED,
154 TPM_UNDEFINED,
155 TPM_UNDEFINED,
156 TPM_LONG, /* 80 */
157 TPM_UNDEFINED,
158 TPM_MEDIUM,
159 TPM_LONG,
160 TPM_SHORT,
161 TPM_UNDEFINED, /* 85 */
162 TPM_UNDEFINED,
163 TPM_UNDEFINED,
164 TPM_UNDEFINED,
165 TPM_UNDEFINED,
166 TPM_SHORT, /* 90 */
167 TPM_SHORT,
168 TPM_SHORT,
169 TPM_SHORT,
170 TPM_SHORT,
171 TPM_UNDEFINED, /* 95 */
172 TPM_UNDEFINED,
173 TPM_UNDEFINED,
174 TPM_UNDEFINED,
175 TPM_UNDEFINED,
176 TPM_MEDIUM, /* 100 */
177 TPM_SHORT,
178 TPM_SHORT,
179 TPM_UNDEFINED,
180 TPM_UNDEFINED,
181 TPM_UNDEFINED, /* 105 */
182 TPM_UNDEFINED,
183 TPM_UNDEFINED,
184 TPM_UNDEFINED,
185 TPM_UNDEFINED,
186 TPM_SHORT, /* 110 */
187 TPM_SHORT,
188 TPM_SHORT,
189 TPM_SHORT,
190 TPM_SHORT,
191 TPM_SHORT, /* 115 */
192 TPM_SHORT,
193 TPM_SHORT,
194 TPM_UNDEFINED,
195 TPM_UNDEFINED,
196 TPM_LONG, /* 120 */
197 TPM_LONG,
198 TPM_MEDIUM,
199 TPM_UNDEFINED,
200 TPM_SHORT,
201 TPM_SHORT, /* 125 */
202 TPM_SHORT,
203 TPM_LONG,
204 TPM_SHORT,
205 TPM_SHORT,
206 TPM_SHORT, /* 130 */
207 TPM_MEDIUM,
208 TPM_UNDEFINED,
209 TPM_SHORT,
210 TPM_MEDIUM,
211 TPM_UNDEFINED, /* 135 */
212 TPM_UNDEFINED,
213 TPM_UNDEFINED,
214 TPM_UNDEFINED,
215 TPM_UNDEFINED,
216 TPM_SHORT, /* 140 */
217 TPM_SHORT,
218 TPM_UNDEFINED,
219 TPM_UNDEFINED,
220 TPM_UNDEFINED,
221 TPM_UNDEFINED, /* 145 */
222 TPM_UNDEFINED,
223 TPM_UNDEFINED,
224 TPM_UNDEFINED,
225 TPM_UNDEFINED,
226 TPM_SHORT, /* 150 */
227 TPM_MEDIUM,
228 TPM_MEDIUM,
229 TPM_SHORT,
230 TPM_SHORT,
231 TPM_UNDEFINED, /* 155 */
232 TPM_UNDEFINED,
233 TPM_UNDEFINED,
234 TPM_UNDEFINED,
235 TPM_UNDEFINED,
236 TPM_SHORT, /* 160 */
237 TPM_SHORT,
238 TPM_SHORT,
239 TPM_SHORT,
240 TPM_UNDEFINED,
241 TPM_UNDEFINED, /* 165 */
242 TPM_UNDEFINED,
243 TPM_UNDEFINED,
244 TPM_UNDEFINED,
245 TPM_UNDEFINED,
246 TPM_LONG, /* 170 */
247 TPM_UNDEFINED,
248 TPM_UNDEFINED,
249 TPM_UNDEFINED,
250 TPM_UNDEFINED,
251 TPM_UNDEFINED, /* 175 */
252 TPM_UNDEFINED,
253 TPM_UNDEFINED,
254 TPM_UNDEFINED,
255 TPM_UNDEFINED,
256 TPM_MEDIUM, /* 180 */
257 TPM_SHORT,
258 TPM_MEDIUM,
259 TPM_MEDIUM,
260 TPM_MEDIUM,
261 TPM_MEDIUM, /* 185 */
262 TPM_SHORT,
263 TPM_UNDEFINED,
264 TPM_UNDEFINED,
265 TPM_UNDEFINED,
266 TPM_UNDEFINED, /* 190 */
267 TPM_UNDEFINED,
268 TPM_UNDEFINED,
269 TPM_UNDEFINED,
270 TPM_UNDEFINED,
271 TPM_UNDEFINED, /* 195 */
272 TPM_UNDEFINED,
273 TPM_UNDEFINED,
274 TPM_UNDEFINED,
275 TPM_UNDEFINED,
276 TPM_SHORT, /* 200 */
277 TPM_UNDEFINED,
278 TPM_UNDEFINED,
279 TPM_UNDEFINED,
280 TPM_SHORT,
281 TPM_SHORT, /* 205 */
282 TPM_SHORT,
283 TPM_SHORT,
284 TPM_SHORT,
285 TPM_SHORT,
286 TPM_MEDIUM, /* 210 */
287 TPM_UNDEFINED,
288 TPM_MEDIUM,
289 TPM_MEDIUM,
290 TPM_MEDIUM,
291 TPM_UNDEFINED, /* 215 */
292 TPM_MEDIUM,
293 TPM_UNDEFINED,
294 TPM_UNDEFINED,
295 TPM_SHORT,
296 TPM_SHORT, /* 220 */
297 TPM_SHORT,
298 TPM_SHORT,
299 TPM_SHORT,
300 TPM_SHORT,
301 TPM_UNDEFINED, /* 225 */
302 TPM_UNDEFINED,
303 TPM_UNDEFINED,
304 TPM_UNDEFINED,
305 TPM_UNDEFINED,
306 TPM_SHORT, /* 230 */
307 TPM_LONG,
308 TPM_MEDIUM,
309 TPM_UNDEFINED,
310 TPM_UNDEFINED,
311 TPM_UNDEFINED, /* 235 */
312 TPM_UNDEFINED,
313 TPM_UNDEFINED,
314 TPM_UNDEFINED,
315 TPM_UNDEFINED,
316 TPM_SHORT, /* 240 */
317 TPM_UNDEFINED,
318 TPM_MEDIUM,
319};
320
1da177e4
LT		 321static void user_reader_timeout(unsigned long ptr)
322{
323 struct tpm_chip *chip = (struct tpm_chip *) ptr;
324
09e12f9f
KJH		 325 schedule_work(&chip->work);
326}
327
c4028958 328static void timeout_work(struct work_struct *work)
09e12f9f 329{
c4028958 330 struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
09e12f9f 331
1da177e4
LT		 332 down(&chip->buffer_mutex);
333 atomic_set(&chip->data_pending, 0);
334 memset(chip->data_buffer, 0, TPM_BUFSIZE);
335 up(&chip->buffer_mutex);
336}
337
9e18ee19
KJH		 338/*
339 * Returns max number of jiffies to wait
340 */
341unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
342 u32 ordinal)
343{
344 int duration_idx = TPM_UNDEFINED;
345 int duration = 0;
346
347 if (ordinal < TPM_MAX_ORDINAL)
348 duration_idx = tpm_ordinal_duration[ordinal];
349 else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
350 TPM_MAX_PROTECTED_ORDINAL)
351 duration_idx =
352 tpm_protected_ordinal_duration[ordinal &
353 TPM_PROTECTED_ORDINAL_MASK];
354
355 if (duration_idx != TPM_UNDEFINED)
36b20020 356 duration = chip->vendor.duration[duration_idx];
9e18ee19
KJH		 357 if (duration <= 0)
358 return 2 * 60 * HZ;
359 else
360 return duration;
361}
362EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
363
1da177e4
LT		 364/*
365 * Internal kernel interface to transmit TPM commands
366 */
367static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
368 size_t bufsiz)
369{
d9e5b6bf 370 ssize_t rc;
9e18ee19 371 u32 count, ordinal;
700d8bdc 372 unsigned long stop;
1da177e4 373
81179bb6 374 count = be32_to_cpu(*((__be32 *) (buf + 2)));
9e18ee19 375 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
1da177e4
LT		 376 if (count == 0)
377 return -ENODATA;
378 if (count > bufsiz) {
e659a3fe 379 dev_err(chip->dev,
b76be681 380 "invalid count value %x %zx \n", count, bufsiz);
1da177e4
LT		 381 return -E2BIG;
382 }
383
384 down(&chip->tpm_mutex);
385
90dda520 386 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
e659a3fe 387 dev_err(chip->dev,
d9e5b6bf
KH		 388 "tpm_transmit: tpm_send: error %zd\n", rc);
389 goto out;
1da177e4
LT		 390 }
391
27084efe
LD		 392 if (chip->vendor.irq)
393 goto out_recv;
394
9e18ee19 395 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
1da177e4 396 do {
90dda520
KJH		 397 u8 status = chip->vendor.status(chip);
398 if ((status & chip->vendor.req_complete_mask) ==
399 chip->vendor.req_complete_val)
1da177e4 400 goto out_recv;
d9e5b6bf 401
90dda520 402 if ((status == chip->vendor.req_canceled)) {
e659a3fe 403 dev_err(chip->dev, "Operation Canceled\n");
d9e5b6bf
KH		 404 rc = -ECANCELED;
405 goto out;
406 }
407
408 msleep(TPM_TIMEOUT); /* CHECK */
1da177e4 409 rmb();
700d8bdc 410 } while (time_before(jiffies, stop));
1da177e4 411
90dda520 412 chip->vendor.cancel(chip);
e659a3fe 413 dev_err(chip->dev, "Operation Timed out\n");
d9e5b6bf
KH		 414 rc = -ETIME;
415 goto out;
1da177e4
LT		 416
417out_recv:
90dda520 418 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
d9e5b6bf 419 if (rc < 0)
e659a3fe 420 dev_err(chip->dev,
d9e5b6bf
KH		 421 "tpm_transmit: tpm_recv: error %zd\n", rc);
422out:
1da177e4 423 up(&chip->tpm_mutex);
d9e5b6bf 424 return rc;
1da177e4
LT		 425}
426
427#define TPM_DIGEST_SIZE 20
beed53a1
KJH		 428#define TPM_ERROR_SIZE 10
429#define TPM_RET_CODE_IDX 6
430#define TPM_GET_CAP_RET_SIZE_IDX 10
431#define TPM_GET_CAP_RET_UINT32_1_IDX 14
432#define TPM_GET_CAP_RET_UINT32_2_IDX 18
433#define TPM_GET_CAP_RET_UINT32_3_IDX 22
434#define TPM_GET_CAP_RET_UINT32_4_IDX 26
08e96e48
KJH		 435#define TPM_GET_CAP_PERM_DISABLE_IDX 16
436#define TPM_GET_CAP_PERM_INACTIVE_IDX 18
437#define TPM_GET_CAP_RET_BOOL_1_IDX 14
438#define TPM_GET_CAP_TEMP_INACTIVE_IDX 16
beed53a1
KJH		 439
440#define TPM_CAP_IDX 13
441#define TPM_CAP_SUBCAP_IDX 21
442
443enum tpm_capabilities {
08e96e48 444 TPM_CAP_FLAG = 4,
beed53a1
KJH		 445 TPM_CAP_PROP = 5,
446};
447
448enum tpm_sub_capabilities {
449 TPM_CAP_PROP_PCR = 0x1,
450 TPM_CAP_PROP_MANUFACTURER = 0x3,
08e96e48
KJH		 451 TPM_CAP_FLAG_PERM = 0x8,
452 TPM_CAP_FLAG_VOL = 0x9,
453 TPM_CAP_PROP_OWNER = 0x11,
454 TPM_CAP_PROP_TIS_TIMEOUT = 0x15,
455 TPM_CAP_PROP_TIS_DURATION = 0x20,
beed53a1
KJH		 456};
457
458/*
459 * This is a semi generic GetCapability command for use
460 * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG
461 * and their associated sub_capabilities.
462 */
463
464static const u8 tpm_cap[] = {
1da177e4
LT		 465 0, 193, /* TPM_TAG_RQU_COMMAND */
466 0, 0, 0, 22, /* length */
467 0, 0, 0, 101, /* TPM_ORD_GetCapability */
beed53a1
KJH		 468 0, 0, 0, 0, /* TPM_CAP_<TYPE> */
469 0, 0, 0, 4, /* TPM_CAP_SUB_<TYPE> size */
470 0, 0, 1, 0 /* TPM_CAP_SUB_<TYPE> */
1da177e4
LT		 471};
472
beed53a1
KJH		 473static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len,
474 char *desc)
475{
476 int err;
477
478 len = tpm_transmit(chip, data, len);
479 if (len < 0)
480 return len;
481 if (len == TPM_ERROR_SIZE) {
482 err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)));
483 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
484 return err;
485 }
486 return 0;
487}
488
08e96e48
KJH		 489void tpm_gen_interrupt(struct tpm_chip *chip)
490{
491 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
492 ssize_t rc;
493
494 memcpy(data, tpm_cap, sizeof(tpm_cap));
495 data[TPM_CAP_IDX] = TPM_CAP_PROP;
496 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
497
498 rc = transmit_cmd(chip, data, sizeof(data),
499 "attempting to determine the timeouts");
500}
501EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
502
503void tpm_get_timeouts(struct tpm_chip *chip)
504{
505 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
506 ssize_t rc;
507 u32 timeout;
508
509 memcpy(data, tpm_cap, sizeof(tpm_cap));
510 data[TPM_CAP_IDX] = TPM_CAP_PROP;
511 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
512
513 rc = transmit_cmd(chip, data, sizeof(data),
514 "attempting to determine the timeouts");
515 if (rc)
516 goto duration;
517
518 if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
519 != 4 * sizeof(u32))
520 goto duration;
521
522 /* Don't overwrite default if value is 0 */
523 timeout =
524 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)));
525 if (timeout)
36b20020 526 chip->vendor.timeout_a = msecs_to_jiffies(timeout);
08e96e48
KJH		 527 timeout =
528 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)));
529 if (timeout)
36b20020 530 chip->vendor.timeout_b = msecs_to_jiffies(timeout);
08e96e48
KJH		 531 timeout =
532 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)));
533 if (timeout)
36b20020 534 chip->vendor.timeout_c = msecs_to_jiffies(timeout);
08e96e48
KJH		 535 timeout =
536 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX)));
537 if (timeout)
36b20020 538 chip->vendor.timeout_d = msecs_to_jiffies(timeout);
08e96e48
KJH		 539
540duration:
541 memcpy(data, tpm_cap, sizeof(tpm_cap));
542 data[TPM_CAP_IDX] = TPM_CAP_PROP;
543 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_DURATION;
544
545 rc = transmit_cmd(chip, data, sizeof(data),
546 "attempting to determine the durations");
547 if (rc)
548 return;
549
550 if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
551 != 3 * sizeof(u32))
552 return;
553
554 chip->vendor.duration[TPM_SHORT] =
36b20020
KJH		 555 msecs_to_jiffies(be32_to_cpu
556 (*((__be32 *) (data +
557 TPM_GET_CAP_RET_UINT32_1_IDX))));
08e96e48 558 chip->vendor.duration[TPM_MEDIUM] =
36b20020
KJH		 559 msecs_to_jiffies(be32_to_cpu
560 (*((__be32 *) (data +
561 TPM_GET_CAP_RET_UINT32_2_IDX))));
08e96e48 562 chip->vendor.duration[TPM_LONG] =
36b20020
KJH		 563 msecs_to_jiffies(be32_to_cpu
564 (*((__be32 *) (data +
565 TPM_GET_CAP_RET_UINT32_3_IDX))));
08e96e48
KJH		 566}
567EXPORT_SYMBOL_GPL(tpm_get_timeouts);
568
569void tpm_continue_selftest(struct tpm_chip *chip)
570{
571 u8 data[] = {
572 0, 193, /* TPM_TAG_RQU_COMMAND */
573 0, 0, 0, 10, /* length */
574 0, 0, 0, 83, /* TPM_ORD_GetCapability */
575 };
576
577 tpm_transmit(chip, data, sizeof(data));
578}
579EXPORT_SYMBOL_GPL(tpm_continue_selftest);
580
581ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
582 char *buf)
583{
584 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)];
585 ssize_t rc;
586
587 struct tpm_chip *chip = dev_get_drvdata(dev);
588 if (chip == NULL)
589 return -ENODEV;
590
591 memcpy(data, tpm_cap, sizeof(tpm_cap));
592 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
593 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
594
595 rc = transmit_cmd(chip, data, sizeof(data),
596 "attemtping to determine the permanent state");
597 if (rc)
598 return 0;
599 return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]);
600}
601EXPORT_SYMBOL_GPL(tpm_show_enabled);
602
603ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
604 char *buf)
605{
606 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)];
607 ssize_t rc;
608
609 struct tpm_chip *chip = dev_get_drvdata(dev);
610 if (chip == NULL)
611 return -ENODEV;
612
613 memcpy(data, tpm_cap, sizeof(tpm_cap));
614 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
615 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
616
617 rc = transmit_cmd(chip, data, sizeof(data),
618 "attemtping to determine the permanent state");
619 if (rc)
620 return 0;
621 return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]);
622}
623EXPORT_SYMBOL_GPL(tpm_show_active);
624
625ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
626 char *buf)
627{
628 u8 data[sizeof(tpm_cap)];
629 ssize_t rc;
630
631 struct tpm_chip *chip = dev_get_drvdata(dev);
632 if (chip == NULL)
633 return -ENODEV;
634
635 memcpy(data, tpm_cap, sizeof(tpm_cap));
636 data[TPM_CAP_IDX] = TPM_CAP_PROP;
637 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER;
638
639 rc = transmit_cmd(chip, data, sizeof(data),
640 "attempting to determine the owner state");
641 if (rc)
642 return 0;
643 return sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]);
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{
650 u8 data[sizeof(tpm_cap)];
651 ssize_t rc;
652
653 struct tpm_chip *chip = dev_get_drvdata(dev);
654 if (chip == NULL)
655 return -ENODEV;
656
657 memcpy(data, tpm_cap, sizeof(tpm_cap));
658 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
659 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL;
660
661 rc = transmit_cmd(chip, data, sizeof(data),
662 "attempting to determine the temporary state");
663 if (rc)
664 return 0;
665 return sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]);
666}
667EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
668
dff37e4b 669static const u8 pcrread[] = {
1da177e4
LT		 670 0, 193, /* TPM_TAG_RQU_COMMAND */
671 0, 0, 0, 14, /* length */
672 0, 0, 0, 21, /* TPM_ORD_PcrRead */
673 0, 0, 0, 0 /* PCR index */
674};
675
6659ca2a
KH		 676ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
677 char *buf)
1da177e4 678{
08e96e48 679 u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(pcrread)), 30)];
beed53a1 680 ssize_t rc;
81179bb6
KH		 681 int i, j, num_pcrs;
682 __be32 index;
1da177e4
LT		 683 char *str = buf;
684
e659a3fe 685 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 686 if (chip == NULL)
687 return -ENODEV;
688
beed53a1
KJH		 689 memcpy(data, tpm_cap, sizeof(tpm_cap));
690 data[TPM_CAP_IDX] = TPM_CAP_PROP;
691 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR;
692
693 rc = transmit_cmd(chip, data, sizeof(data),
694 "attempting to determine the number of PCRS");
695 if (rc)
e234bc97 696 return 0;
1da177e4 697
81179bb6 698 num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));
1da177e4
LT		 699 for (i = 0; i < num_pcrs; i++) {
700 memcpy(data, pcrread, sizeof(pcrread));
701 index = cpu_to_be32(i);
702 memcpy(data + 10, &index, 4);
beed53a1
KJH		 703 rc = transmit_cmd(chip, data, sizeof(data),
704 "attempting to read a PCR");
705 if (rc)
e234bc97 706 goto out;
1da177e4
LT		 707 str += sprintf(str, "PCR-%02d: ", i);
708 for (j = 0; j < TPM_DIGEST_SIZE; j++)
709 str += sprintf(str, "%02X ", *(data + 10 + j));
710 str += sprintf(str, "\n");
711 }
e234bc97 712out:
1da177e4
LT		 713 return str - buf;
714}
6659ca2a 715EXPORT_SYMBOL_GPL(tpm_show_pcrs);
1da177e4
LT		 716
717#define READ_PUBEK_RESULT_SIZE 314
dff37e4b 718static const u8 readpubek[] = {
1da177e4
LT		 719 0, 193, /* TPM_TAG_RQU_COMMAND */
720 0, 0, 0, 30, /* length */
721 0, 0, 0, 124, /* TPM_ORD_ReadPubek */
722};
723
6659ca2a
KH		 724ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
725 char *buf)
1da177e4 726{
2df7111f 727 u8 *data;
beed53a1 728 ssize_t err;
81179bb6 729 int i, rc;
1da177e4
LT		 730 char *str = buf;
731
e659a3fe 732 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 733 if (chip == NULL)
734 return -ENODEV;
735
b888c87b 736 data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);
2df7111f
KH		 737 if (!data)
738 return -ENOMEM;
739
1da177e4 740 memcpy(data, readpubek, sizeof(readpubek));
1da177e4 741
beed53a1
KJH		 742 err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE,
743 "attempting to read the PUBEK");
744 if (err)
34d6e075 745 goto out;
1da177e4
LT		 746
747 /*
748 ignore header 10 bytes
749 algorithm 32 bits (1 == RSA )
750 encscheme 16 bits
751 sigscheme 16 bits
752 parameters (RSA 12->bytes: keybit, #primes, expbit)
753 keylenbytes 32 bits
754 256 byte modulus
755 ignore checksum 20 bytes
756 */
757
1da177e4
LT		 758 str +=
759 sprintf(str,
760 "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
761 "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
762 " %02X %02X %02X %02X %02X %02X %02X %02X\n"
763 "Modulus length: %d\nModulus: \n",
764 data[10], data[11], data[12], data[13], data[14],
765 data[15], data[16], data[17], data[22], data[23],
766 data[24], data[25], data[26], data[27], data[28],
767 data[29], data[30], data[31], data[32], data[33],
1dda8abe 768 be32_to_cpu(*((__be32 *) (data + 34))));
1da177e4
LT		 769
770 for (i = 0; i < 256; i++) {
1dda8abe 771 str += sprintf(str, "%02X ", data[i + 38]);
1da177e4
LT		 772 if ((i + 1) % 16 == 0)
773 str += sprintf(str, "\n");
774 }
34d6e075 775out:
beed53a1 776 rc = str - buf;
2df7111f
KH		 777 kfree(data);
778 return rc;
1da177e4 779}
6659ca2a 780EXPORT_SYMBOL_GPL(tpm_show_pubek);
1da177e4 781
beed53a1 782#define CAP_VERSION_1_1 6
08e96e48 783#define CAP_VERSION_1_2 0x1A
beed53a1 784#define CAP_VERSION_IDX 13
dff37e4b 785static const u8 cap_version[] = {
1da177e4
LT		 786 0, 193, /* TPM_TAG_RQU_COMMAND */
787 0, 0, 0, 18, /* length */
788 0, 0, 0, 101, /* TPM_ORD_GetCapability */
beed53a1 789 0, 0, 0, 0,
1da177e4
LT		 790 0, 0, 0, 0
791};
792
6659ca2a
KH		 793ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
794 char *buf)
1da177e4 795{
08e96e48 796 u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)];
beed53a1 797 ssize_t rc;
1da177e4
LT		 798 char *str = buf;
799
e659a3fe 800 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 801 if (chip == NULL)
802 return -ENODEV;
803
beed53a1
KJH		 804 memcpy(data, tpm_cap, sizeof(tpm_cap));
805 data[TPM_CAP_IDX] = TPM_CAP_PROP;
806 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
1da177e4 807
beed53a1
KJH		 808 rc = transmit_cmd(chip, data, sizeof(data),
809 "attempting to determine the manufacturer");
810 if (rc)
811 return 0;
1da177e4
LT		 812
813 str += sprintf(str, "Manufacturer: 0x%x\n",
beed53a1 814 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
1da177e4
LT		 815
816 memcpy(data, cap_version, sizeof(cap_version));
beed53a1
KJH		 817 data[CAP_VERSION_IDX] = CAP_VERSION_1_1;
818 rc = transmit_cmd(chip, data, sizeof(data),
819 "attempting to determine the 1.1 version");
820 if (rc)
821 goto out;
1da177e4 822
beed53a1
KJH		 823 str += sprintf(str,
824 "TCG version: %d.%d\nFirmware version: %d.%d\n",
825 (int) data[14], (int) data[15], (int) data[16],
826 (int) data[17]);
1da177e4 827
beed53a1 828out:
1da177e4
LT		 829 return str - buf;
830}
6659ca2a
KH		 831EXPORT_SYMBOL_GPL(tpm_show_caps);
832
08e96e48
KJH		 833ssize_t tpm_show_caps_1_2(struct device * dev,
834 struct device_attribute * attr, char *buf)
835{
836 u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)];
837 ssize_t len;
838 char *str = buf;
839
840 struct tpm_chip *chip = dev_get_drvdata(dev);
841 if (chip == NULL)
842 return -ENODEV;
843
844 memcpy(data, tpm_cap, sizeof(tpm_cap));
845 data[TPM_CAP_IDX] = TPM_CAP_PROP;
846 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
847
848 if ((len = tpm_transmit(chip, data, sizeof(data))) <=
849 TPM_ERROR_SIZE) {
850 dev_dbg(chip->dev, "A TPM error (%d) occurred "
851 "attempting to determine the manufacturer\n",
852 be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
853 return 0;
854 }
855
856 str += sprintf(str, "Manufacturer: 0x%x\n",
857 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
858
859 memcpy(data, cap_version, sizeof(cap_version));
860 data[CAP_VERSION_IDX] = CAP_VERSION_1_2;
861
862 if ((len = tpm_transmit(chip, data, sizeof(data))) <=
863 TPM_ERROR_SIZE) {
864 dev_err(chip->dev, "A TPM error (%d) occurred "
865 "attempting to determine the 1.2 version\n",
866 be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
867 goto out;
868 }
869 str += sprintf(str,
870 "TCG version: %d.%d\nFirmware version: %d.%d\n",
871 (int) data[16], (int) data[17], (int) data[18],
872 (int) data[19]);
873
874out:
875 return str - buf;
876}
877EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
878
6659ca2a
KH		 879ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
880 const char *buf, size_t count)
881{
882 struct tpm_chip *chip = dev_get_drvdata(dev);
883 if (chip == NULL)
884 return 0;
885
90dda520 886 chip->vendor.cancel(chip);
6659ca2a
KH		 887 return count;
888}
889EXPORT_SYMBOL_GPL(tpm_store_cancel);
1da177e4 890
1da177e4
LT		 891/*
892 * Device file system interface to the TPM
893 */
894int tpm_open(struct inode *inode, struct file *file)
895{
896 int rc = 0, minor = iminor(inode);
897 struct tpm_chip *chip = NULL, *pos;
898
899 spin_lock(&driver_lock);
900
901 list_for_each_entry(pos, &tpm_chip_list, list) {
90dda520 902 if (pos->vendor.miscdev.minor == minor) {
1da177e4
LT		 903 chip = pos;
904 break;
905 }
906 }
907
908 if (chip == NULL) {
909 rc = -ENODEV;
910 goto err_out;
911 }
912
913 if (chip->num_opens) {
b888c87b 914 dev_dbg(chip->dev, "Another process owns this TPM\n");
1da177e4
LT		 915 rc = -EBUSY;
916 goto err_out;
917 }
918
919 chip->num_opens++;
e659a3fe 920 get_device(chip->dev);
1da177e4
LT		 921
922 spin_unlock(&driver_lock);
923
924 chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
925 if (chip->data_buffer == NULL) {
926 chip->num_opens--;
e659a3fe 927 put_device(chip->dev);
1da177e4
LT		 928 return -ENOMEM;
929 }
930
931 atomic_set(&chip->data_pending, 0);
932
933 file->private_data = chip;
934 return 0;
935
936err_out:
937 spin_unlock(&driver_lock);
938 return rc;
939}
1da177e4
LT		 940EXPORT_SYMBOL_GPL(tpm_open);
941
942int tpm_release(struct inode *inode, struct file *file)
943{
944 struct tpm_chip *chip = file->private_data;
1da177e4
LT		 945
946 spin_lock(&driver_lock);
5e976d55 947 file->private_data = NULL;
1da177e4 948 chip->num_opens--;
fe3fd483 949 del_singleshot_timer_sync(&chip->user_read_timer);
ba396115 950 flush_scheduled_work();
1da177e4 951 atomic_set(&chip->data_pending, 0);
e659a3fe 952 put_device(chip->dev);
5e976d55
KH		 953 kfree(chip->data_buffer);
954 spin_unlock(&driver_lock);
1da177e4
LT		 955 return 0;
956}
1da177e4
LT		 957EXPORT_SYMBOL_GPL(tpm_release);
958
b888c87b 959ssize_t tpm_write(struct file *file, const char __user *buf,
3c2f606a 960 size_t size, loff_t *off)
1da177e4
LT		 961{
962 struct tpm_chip *chip = file->private_data;
963 int in_size = size, out_size;
964
965 /* cannot perform a write until the read has cleared
966 either via tpm_read or a user_read_timer timeout */
700d8bdc
NA		 967 while (atomic_read(&chip->data_pending) != 0)
968 msleep(TPM_TIMEOUT);
1da177e4
LT		 969
970 down(&chip->buffer_mutex);
971
972 if (in_size > TPM_BUFSIZE)
973 in_size = TPM_BUFSIZE;
974
975 if (copy_from_user
976 (chip->data_buffer, (void __user *) buf, in_size)) {
977 up(&chip->buffer_mutex);
978 return -EFAULT;
979 }
980
981 /* atomic tpm command send and result receive */
982 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
983
984 atomic_set(&chip->data_pending, out_size);
985 up(&chip->buffer_mutex);
986
987 /* Set a timeout by which the reader must come claim the result */
fe3fd483 988 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1da177e4
LT		 989
990 return in_size;
991}
1da177e4
LT		 992EXPORT_SYMBOL_GPL(tpm_write);
993
3c2f606a
KJH		 994ssize_t tpm_read(struct file *file, char __user *buf,
995 size_t size, loff_t *off)
1da177e4
LT		 996{
997 struct tpm_chip *chip = file->private_data;
5b44bd58 998 int ret_size;
1da177e4 999
5b44bd58 1000 del_singleshot_timer_sync(&chip->user_read_timer);
ba396115 1001 flush_scheduled_work();
5b44bd58
KH		 1002 ret_size = atomic_read(&chip->data_pending);
1003 atomic_set(&chip->data_pending, 0);
1004 if (ret_size > 0) { /* relay data */
1005 if (size < ret_size)
1006 ret_size = size;
1da177e4
LT		 1007
1008 down(&chip->buffer_mutex);
f6a2382c 1009 if (copy_to_user(buf, chip->data_buffer, ret_size))
5b44bd58 1010 ret_size = -EFAULT;
1da177e4
LT		 1011 up(&chip->buffer_mutex);
1012 }
1013
1014 return ret_size;
1015}
1da177e4
LT		 1016EXPORT_SYMBOL_GPL(tpm_read);
1017
e659a3fe 1018void tpm_remove_hardware(struct device *dev)
1da177e4 1019{
e659a3fe 1020 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1021
1022 if (chip == NULL) {
e659a3fe 1023 dev_err(dev, "No device data found\n");
1da177e4
LT		 1024 return;
1025 }
1026
1027 spin_lock(&driver_lock);
1028
1029 list_del(&chip->list);
1030
1031 spin_unlock(&driver_lock);
1032
e659a3fe 1033 dev_set_drvdata(dev, NULL);
90dda520
KJH		 1034 misc_deregister(&chip->vendor.miscdev);
1035 kfree(chip->vendor.miscdev.name);
1da177e4 1036
90dda520 1037 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
55a82ab3 1038 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1039
10685a95 1040 clear_bit(chip->dev_num, dev_mask);
1da177e4
LT		 1041
1042 kfree(chip);
1043
e659a3fe 1044 put_device(dev);
1da177e4 1045}
e659a3fe 1046EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4
LT		 1047
1048static u8 savestate[] = {
1049 0, 193, /* TPM_TAG_RQU_COMMAND */
1050 0, 0, 0, 10, /* blob length (in bytes) */
1051 0, 0, 0, 152 /* TPM_ORD_SaveState */
1052};
1053
1054/*
1055 * We are about to suspend. Save the TPM state
1056 * so that it can be restored.
1057 */
ce2c87d4 1058int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1da177e4 1059{
ce2c87d4 1060 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1061 if (chip == NULL)
1062 return -ENODEV;
1063
1064 tpm_transmit(chip, savestate, sizeof(savestate));
1065 return 0;
1066}
1da177e4
LT		 1067EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1068
1069/*
1070 * Resume from a power safe. The BIOS already restored
1071 * the TPM state.
1072 */
ce2c87d4 1073int tpm_pm_resume(struct device *dev)
1da177e4 1074{
ce2c87d4 1075 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1076
1077 if (chip == NULL)
1078 return -ENODEV;
1079
1da177e4
LT		 1080 return 0;
1081}
1da177e4
LT		 1082EXPORT_SYMBOL_GPL(tpm_pm_resume);
1083
1084/*
1085 * Called from tpm_<specific>.c probe function only for devices
1086 * the driver has determined it should claim. Prior to calling
1087 * this function the specific probe function has called pci_enable_device
1088 * upon errant exit from this function specific probe function should call
1089 * pci_disable_device
1090 */
e0dd03ca
KJH		 1091struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vendor_specific
1092 *entry)
1da177e4 1093{
6f9beccb
KJH		 1094#define DEVNAME_SIZE 7
1095
1096 char *devname;
1da177e4 1097 struct tpm_chip *chip;
1da177e4
LT		 1098
1099 /* Driver specific per-device data */
b888c87b 1100 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1da177e4 1101 if (chip == NULL)
e0dd03ca 1102 return NULL;
1da177e4 1103
1da177e4
LT		 1104 init_MUTEX(&chip->buffer_mutex);
1105 init_MUTEX(&chip->tpm_mutex);
1da177e4
LT		 1106 INIT_LIST_HEAD(&chip->list);
1107
c4028958 1108 INIT_WORK(&chip->work, timeout_work);
09e12f9f 1109
fe3fd483
KH		 1110 init_timer(&chip->user_read_timer);
1111 chip->user_read_timer.function = user_reader_timeout;
1112 chip->user_read_timer.data = (unsigned long) chip;
1113
90dda520 1114 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4 1115
10685a95 1116 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1da177e4 1117
10685a95 1118 if (chip->dev_num >= TPM_NUM_DEVICES) {
b888c87b 1119 dev_err(dev, "No available tpm device numbers\n");
1da177e4 1120 kfree(chip);
e0dd03ca 1121 return NULL;
1da177e4 1122 } else if (chip->dev_num == 0)
90dda520 1123 chip->vendor.miscdev.minor = TPM_MINOR;
1da177e4 1124 else
90dda520 1125 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1da177e4 1126
10685a95
KJH		 1127 set_bit(chip->dev_num, dev_mask);
1128
6f9beccb
KJH		 1129 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1130 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
90dda520 1131 chip->vendor.miscdev.name = devname;
1da177e4 1132
94fbcded 1133 chip->vendor.miscdev.parent = dev;
e659a3fe 1134 chip->dev = get_device(dev);
1da177e4 1135
90dda520 1136 if (misc_register(&chip->vendor.miscdev)) {
e659a3fe 1137 dev_err(chip->dev,
1da177e4 1138 "unable to misc_register %s, minor %d\n",
90dda520
KJH		 1139 chip->vendor.miscdev.name,
1140 chip->vendor.miscdev.minor);
e659a3fe 1141 put_device(dev);
10685a95 1142 clear_bit(chip->dev_num, dev_mask);
1da177e4 1143 kfree(chip);
2e82636a 1144 kfree(devname);
e0dd03ca 1145 return NULL;
1da177e4
LT		 1146 }
1147
5e976d55
KH		 1148 spin_lock(&driver_lock);
1149
e659a3fe 1150 dev_set_drvdata(dev, chip);
1da177e4
LT		 1151
1152 list_add(&chip->list, &tpm_chip_list);
1153
5e976d55
KH		 1154 spin_unlock(&driver_lock);
1155
f33d9bd5
JG		 1156 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1157 list_del(&chip->list);
1158 put_device(dev);
1159 clear_bit(chip->dev_num, dev_mask);
1160 kfree(chip);
1161 kfree(devname);
1162 return NULL;
1163 }
1da177e4 1164
55a82ab3
KJH		 1165 chip->bios_dir = tpm_bios_log_setup(devname);
1166
e0dd03ca 1167 return chip;
1da177e4 1168}
1da177e4
LT		 1169EXPORT_SYMBOL_GPL(tpm_register_hardware);
1170
1da177e4
LT		 1171MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1172MODULE_DESCRIPTION("TPM Driver");
1173MODULE_VERSION("2.0");
1174MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)