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[PATCH] tpm: new 1.2 sysfs files
[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,
35 TPM_NUM_MASK_ENTRIES = TPM_NUM_DEVICES / (8 * sizeof(int))
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);
3122a88a 51static int dev_mask[TPM_NUM_MASK_ENTRIES];
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
3c2f606a 329static void timeout_work(void *ptr)
09e12f9f
KJH		 330{
331 struct tpm_chip *chip = ptr;
332
1da177e4
LT		 333 down(&chip->buffer_mutex);
334 atomic_set(&chip->data_pending, 0);
335 memset(chip->data_buffer, 0, TPM_BUFSIZE);
336 up(&chip->buffer_mutex);
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)
357 duration = chip->vendor.duration[duration_idx] * HZ / 1000;
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
385 down(&chip->tpm_mutex);
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
9e18ee19 393 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
1da177e4 394 do {
90dda520
KJH		 395 u8 status = chip->vendor.status(chip);
396 if ((status & chip->vendor.req_complete_mask) ==
397 chip->vendor.req_complete_val)
1da177e4 398 goto out_recv;
d9e5b6bf 399
90dda520 400 if ((status == chip->vendor.req_canceled)) {
e659a3fe 401 dev_err(chip->dev, "Operation Canceled\n");
d9e5b6bf
KH		 402 rc = -ECANCELED;
403 goto out;
404 }
405
406 msleep(TPM_TIMEOUT); /* CHECK */
1da177e4 407 rmb();
700d8bdc 408 } while (time_before(jiffies, stop));
1da177e4 409
90dda520 410 chip->vendor.cancel(chip);
e659a3fe 411 dev_err(chip->dev, "Operation Timed out\n");
d9e5b6bf
KH		 412 rc = -ETIME;
413 goto out;
1da177e4
LT		 414
415out_recv:
90dda520 416 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
d9e5b6bf 417 if (rc < 0)
e659a3fe 418 dev_err(chip->dev,
d9e5b6bf
KH		 419 "tpm_transmit: tpm_recv: error %zd\n", rc);
420out:
1da177e4 421 up(&chip->tpm_mutex);
d9e5b6bf 422 return rc;
1da177e4
LT		 423}
424
425#define TPM_DIGEST_SIZE 20
beed53a1
KJH		 426#define TPM_ERROR_SIZE 10
427#define TPM_RET_CODE_IDX 6
428#define TPM_GET_CAP_RET_SIZE_IDX 10
429#define TPM_GET_CAP_RET_UINT32_1_IDX 14
430#define TPM_GET_CAP_RET_UINT32_2_IDX 18
431#define TPM_GET_CAP_RET_UINT32_3_IDX 22
432#define TPM_GET_CAP_RET_UINT32_4_IDX 26
08e96e48
KJH		 433#define TPM_GET_CAP_PERM_DISABLE_IDX 16
434#define TPM_GET_CAP_PERM_INACTIVE_IDX 18
435#define TPM_GET_CAP_RET_BOOL_1_IDX 14
436#define TPM_GET_CAP_TEMP_INACTIVE_IDX 16
beed53a1
KJH		 437
438#define TPM_CAP_IDX 13
439#define TPM_CAP_SUBCAP_IDX 21
440
441enum tpm_capabilities {
08e96e48 442 TPM_CAP_FLAG = 4,
beed53a1
KJH		 443 TPM_CAP_PROP = 5,
444};
445
446enum tpm_sub_capabilities {
447 TPM_CAP_PROP_PCR = 0x1,
448 TPM_CAP_PROP_MANUFACTURER = 0x3,
08e96e48
KJH		 449 TPM_CAP_FLAG_PERM = 0x8,
450 TPM_CAP_FLAG_VOL = 0x9,
451 TPM_CAP_PROP_OWNER = 0x11,
452 TPM_CAP_PROP_TIS_TIMEOUT = 0x15,
453 TPM_CAP_PROP_TIS_DURATION = 0x20,
beed53a1
KJH		 454};
455
456/*
457 * This is a semi generic GetCapability command for use
458 * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG
459 * and their associated sub_capabilities.
460 */
461
462static const u8 tpm_cap[] = {
1da177e4
LT		 463 0, 193, /* TPM_TAG_RQU_COMMAND */
464 0, 0, 0, 22, /* length */
465 0, 0, 0, 101, /* TPM_ORD_GetCapability */
beed53a1
KJH		 466 0, 0, 0, 0, /* TPM_CAP_<TYPE> */
467 0, 0, 0, 4, /* TPM_CAP_SUB_<TYPE> size */
468 0, 0, 1, 0 /* TPM_CAP_SUB_<TYPE> */
1da177e4
LT		 469};
470
beed53a1
KJH		 471static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len,
472 char *desc)
473{
474 int err;
475
476 len = tpm_transmit(chip, data, len);
477 if (len < 0)
478 return len;
479 if (len == TPM_ERROR_SIZE) {
480 err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)));
481 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
482 return err;
483 }
484 return 0;
485}
486
08e96e48
KJH		 487void tpm_gen_interrupt(struct tpm_chip *chip)
488{
489 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
490 ssize_t rc;
491
492 memcpy(data, tpm_cap, sizeof(tpm_cap));
493 data[TPM_CAP_IDX] = TPM_CAP_PROP;
494 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
495
496 rc = transmit_cmd(chip, data, sizeof(data),
497 "attempting to determine the timeouts");
498}
499EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
500
501void tpm_get_timeouts(struct tpm_chip *chip)
502{
503 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
504 ssize_t rc;
505 u32 timeout;
506
507 memcpy(data, tpm_cap, sizeof(tpm_cap));
508 data[TPM_CAP_IDX] = TPM_CAP_PROP;
509 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
510
511 rc = transmit_cmd(chip, data, sizeof(data),
512 "attempting to determine the timeouts");
513 if (rc)
514 goto duration;
515
516 if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
517 != 4 * sizeof(u32))
518 goto duration;
519
520 /* Don't overwrite default if value is 0 */
521 timeout =
522 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)));
523 if (timeout)
524 chip->vendor.timeout_a = timeout;
525 timeout =
526 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)));
527 if (timeout)
528 chip->vendor.timeout_b = timeout;
529 timeout =
530 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)));
531 if (timeout)
532 chip->vendor.timeout_c = timeout;
533 timeout =
534 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX)));
535 if (timeout)
536 chip->vendor.timeout_d = timeout;
537
538duration:
539 memcpy(data, tpm_cap, sizeof(tpm_cap));
540 data[TPM_CAP_IDX] = TPM_CAP_PROP;
541 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_DURATION;
542
543 rc = transmit_cmd(chip, data, sizeof(data),
544 "attempting to determine the durations");
545 if (rc)
546 return;
547
548 if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
549 != 3 * sizeof(u32))
550 return;
551
552 chip->vendor.duration[TPM_SHORT] =
553 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)));
554 chip->vendor.duration[TPM_MEDIUM] =
555 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)));
556 chip->vendor.duration[TPM_LONG] =
557 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)));
558}
559EXPORT_SYMBOL_GPL(tpm_get_timeouts);
560
561void tpm_continue_selftest(struct tpm_chip *chip)
562{
563 u8 data[] = {
564 0, 193, /* TPM_TAG_RQU_COMMAND */
565 0, 0, 0, 10, /* length */
566 0, 0, 0, 83, /* TPM_ORD_GetCapability */
567 };
568
569 tpm_transmit(chip, data, sizeof(data));
570}
571EXPORT_SYMBOL_GPL(tpm_continue_selftest);
572
573ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
574 char *buf)
575{
576 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)];
577 ssize_t rc;
578
579 struct tpm_chip *chip = dev_get_drvdata(dev);
580 if (chip == NULL)
581 return -ENODEV;
582
583 memcpy(data, tpm_cap, sizeof(tpm_cap));
584 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
585 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
586
587 rc = transmit_cmd(chip, data, sizeof(data),
588 "attemtping to determine the permanent state");
589 if (rc)
590 return 0;
591 return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]);
592}
593EXPORT_SYMBOL_GPL(tpm_show_enabled);
594
595ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
596 char *buf)
597{
598 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)];
599 ssize_t rc;
600
601 struct tpm_chip *chip = dev_get_drvdata(dev);
602 if (chip == NULL)
603 return -ENODEV;
604
605 memcpy(data, tpm_cap, sizeof(tpm_cap));
606 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
607 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
608
609 rc = transmit_cmd(chip, data, sizeof(data),
610 "attemtping to determine the permanent state");
611 if (rc)
612 return 0;
613 return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]);
614}
615EXPORT_SYMBOL_GPL(tpm_show_active);
616
617ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
618 char *buf)
619{
620 u8 data[sizeof(tpm_cap)];
621 ssize_t rc;
622
623 struct tpm_chip *chip = dev_get_drvdata(dev);
624 if (chip == NULL)
625 return -ENODEV;
626
627 memcpy(data, tpm_cap, sizeof(tpm_cap));
628 data[TPM_CAP_IDX] = TPM_CAP_PROP;
629 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER;
630
631 rc = transmit_cmd(chip, data, sizeof(data),
632 "attempting to determine the owner state");
633 if (rc)
634 return 0;
635 return sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]);
636}
637EXPORT_SYMBOL_GPL(tpm_show_owned);
638
639ssize_t tpm_show_temp_deactivated(struct device * dev,
640 struct device_attribute * attr, char *buf)
641{
642 u8 data[sizeof(tpm_cap)];
643 ssize_t rc;
644
645 struct tpm_chip *chip = dev_get_drvdata(dev);
646 if (chip == NULL)
647 return -ENODEV;
648
649 memcpy(data, tpm_cap, sizeof(tpm_cap));
650 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
651 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL;
652
653 rc = transmit_cmd(chip, data, sizeof(data),
654 "attempting to determine the temporary state");
655 if (rc)
656 return 0;
657 return sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]);
658}
659EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
660
dff37e4b 661static const u8 pcrread[] = {
1da177e4
LT		 662 0, 193, /* TPM_TAG_RQU_COMMAND */
663 0, 0, 0, 14, /* length */
664 0, 0, 0, 21, /* TPM_ORD_PcrRead */
665 0, 0, 0, 0 /* PCR index */
666};
667
6659ca2a
KH		 668ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
669 char *buf)
1da177e4 670{
08e96e48 671 u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(pcrread)), 30)];
beed53a1 672 ssize_t rc;
81179bb6
KH		 673 int i, j, num_pcrs;
674 __be32 index;
1da177e4
LT		 675 char *str = buf;
676
e659a3fe 677 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 678 if (chip == NULL)
679 return -ENODEV;
680
beed53a1
KJH		 681 memcpy(data, tpm_cap, sizeof(tpm_cap));
682 data[TPM_CAP_IDX] = TPM_CAP_PROP;
683 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR;
684
685 rc = transmit_cmd(chip, data, sizeof(data),
686 "attempting to determine the number of PCRS");
687 if (rc)
e234bc97 688 return 0;
1da177e4 689
81179bb6 690 num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));
1da177e4
LT		 691 for (i = 0; i < num_pcrs; i++) {
692 memcpy(data, pcrread, sizeof(pcrread));
693 index = cpu_to_be32(i);
694 memcpy(data + 10, &index, 4);
beed53a1
KJH		 695 rc = transmit_cmd(chip, data, sizeof(data),
696 "attempting to read a PCR");
697 if (rc)
e234bc97 698 goto out;
1da177e4
LT		 699 str += sprintf(str, "PCR-%02d: ", i);
700 for (j = 0; j < TPM_DIGEST_SIZE; j++)
701 str += sprintf(str, "%02X ", *(data + 10 + j));
702 str += sprintf(str, "\n");
703 }
e234bc97 704out:
1da177e4
LT		 705 return str - buf;
706}
6659ca2a 707EXPORT_SYMBOL_GPL(tpm_show_pcrs);
1da177e4
LT		 708
709#define READ_PUBEK_RESULT_SIZE 314
dff37e4b 710static const u8 readpubek[] = {
1da177e4
LT		 711 0, 193, /* TPM_TAG_RQU_COMMAND */
712 0, 0, 0, 30, /* length */
713 0, 0, 0, 124, /* TPM_ORD_ReadPubek */
714};
715
6659ca2a
KH		 716ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
717 char *buf)
1da177e4 718{
2df7111f 719 u8 *data;
beed53a1 720 ssize_t err;
81179bb6 721 int i, rc;
1da177e4
LT		 722 char *str = buf;
723
e659a3fe 724 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 725 if (chip == NULL)
726 return -ENODEV;
727
b888c87b 728 data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);
2df7111f
KH		 729 if (!data)
730 return -ENOMEM;
731
1da177e4 732 memcpy(data, readpubek, sizeof(readpubek));
1da177e4 733
beed53a1
KJH		 734 err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE,
735 "attempting to read the PUBEK");
736 if (err)
34d6e075 737 goto out;
1da177e4
LT		 738
739 /*
740 ignore header 10 bytes
741 algorithm 32 bits (1 == RSA )
742 encscheme 16 bits
743 sigscheme 16 bits
744 parameters (RSA 12->bytes: keybit, #primes, expbit)
745 keylenbytes 32 bits
746 256 byte modulus
747 ignore checksum 20 bytes
748 */
749
1da177e4
LT		 750 str +=
751 sprintf(str,
752 "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
753 "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
754 " %02X %02X %02X %02X %02X %02X %02X %02X\n"
755 "Modulus length: %d\nModulus: \n",
756 data[10], data[11], data[12], data[13], data[14],
757 data[15], data[16], data[17], data[22], data[23],
758 data[24], data[25], data[26], data[27], data[28],
759 data[29], data[30], data[31], data[32], data[33],
1dda8abe 760 be32_to_cpu(*((__be32 *) (data + 34))));
1da177e4
LT		 761
762 for (i = 0; i < 256; i++) {
1dda8abe 763 str += sprintf(str, "%02X ", data[i + 38]);
1da177e4
LT		 764 if ((i + 1) % 16 == 0)
765 str += sprintf(str, "\n");
766 }
34d6e075 767out:
beed53a1 768 rc = str - buf;
2df7111f
KH		 769 kfree(data);
770 return rc;
1da177e4 771}
6659ca2a 772EXPORT_SYMBOL_GPL(tpm_show_pubek);
1da177e4 773
beed53a1 774#define CAP_VERSION_1_1 6
08e96e48 775#define CAP_VERSION_1_2 0x1A
beed53a1 776#define CAP_VERSION_IDX 13
dff37e4b 777static const u8 cap_version[] = {
1da177e4
LT		 778 0, 193, /* TPM_TAG_RQU_COMMAND */
779 0, 0, 0, 18, /* length */
780 0, 0, 0, 101, /* TPM_ORD_GetCapability */
beed53a1 781 0, 0, 0, 0,
1da177e4
LT		 782 0, 0, 0, 0
783};
784
6659ca2a
KH		 785ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
786 char *buf)
1da177e4 787{
08e96e48 788 u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)];
beed53a1 789 ssize_t rc;
1da177e4
LT		 790 char *str = buf;
791
e659a3fe 792 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 793 if (chip == NULL)
794 return -ENODEV;
795
beed53a1
KJH		 796 memcpy(data, tpm_cap, sizeof(tpm_cap));
797 data[TPM_CAP_IDX] = TPM_CAP_PROP;
798 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
1da177e4 799
beed53a1
KJH		 800 rc = transmit_cmd(chip, data, sizeof(data),
801 "attempting to determine the manufacturer");
802 if (rc)
803 return 0;
1da177e4
LT		 804
805 str += sprintf(str, "Manufacturer: 0x%x\n",
beed53a1 806 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
1da177e4
LT		 807
808 memcpy(data, cap_version, sizeof(cap_version));
beed53a1
KJH		 809 data[CAP_VERSION_IDX] = CAP_VERSION_1_1;
810 rc = transmit_cmd(chip, data, sizeof(data),
811 "attempting to determine the 1.1 version");
812 if (rc)
813 goto out;
1da177e4 814
beed53a1
KJH		 815 str += sprintf(str,
816 "TCG version: %d.%d\nFirmware version: %d.%d\n",
817 (int) data[14], (int) data[15], (int) data[16],
818 (int) data[17]);
1da177e4 819
beed53a1 820out:
1da177e4
LT		 821 return str - buf;
822}
6659ca2a
KH		 823EXPORT_SYMBOL_GPL(tpm_show_caps);
824
08e96e48
KJH		 825ssize_t tpm_show_caps_1_2(struct device * dev,
826 struct device_attribute * attr, char *buf)
827{
828 u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)];
829 ssize_t len;
830 char *str = buf;
831
832 struct tpm_chip *chip = dev_get_drvdata(dev);
833 if (chip == NULL)
834 return -ENODEV;
835
836 memcpy(data, tpm_cap, sizeof(tpm_cap));
837 data[TPM_CAP_IDX] = TPM_CAP_PROP;
838 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
839
840 if ((len = tpm_transmit(chip, data, sizeof(data))) <=
841 TPM_ERROR_SIZE) {
842 dev_dbg(chip->dev, "A TPM error (%d) occurred "
843 "attempting to determine the manufacturer\n",
844 be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
845 return 0;
846 }
847
848 str += sprintf(str, "Manufacturer: 0x%x\n",
849 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
850
851 memcpy(data, cap_version, sizeof(cap_version));
852 data[CAP_VERSION_IDX] = CAP_VERSION_1_2;
853
854 if ((len = tpm_transmit(chip, data, sizeof(data))) <=
855 TPM_ERROR_SIZE) {
856 dev_err(chip->dev, "A TPM error (%d) occurred "
857 "attempting to determine the 1.2 version\n",
858 be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
859 goto out;
860 }
861 str += sprintf(str,
862 "TCG version: %d.%d\nFirmware version: %d.%d\n",
863 (int) data[16], (int) data[17], (int) data[18],
864 (int) data[19]);
865
866out:
867 return str - buf;
868}
869EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
870
6659ca2a
KH		 871ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
872 const char *buf, size_t count)
873{
874 struct tpm_chip *chip = dev_get_drvdata(dev);
875 if (chip == NULL)
876 return 0;
877
90dda520 878 chip->vendor.cancel(chip);
6659ca2a
KH		 879 return count;
880}
881EXPORT_SYMBOL_GPL(tpm_store_cancel);
1da177e4 882
1da177e4
LT		 883/*
884 * Device file system interface to the TPM
885 */
886int tpm_open(struct inode *inode, struct file *file)
887{
888 int rc = 0, minor = iminor(inode);
889 struct tpm_chip *chip = NULL, *pos;
890
891 spin_lock(&driver_lock);
892
893 list_for_each_entry(pos, &tpm_chip_list, list) {
90dda520 894 if (pos->vendor.miscdev.minor == minor) {
1da177e4
LT		 895 chip = pos;
896 break;
897 }
898 }
899
900 if (chip == NULL) {
901 rc = -ENODEV;
902 goto err_out;
903 }
904
905 if (chip->num_opens) {
b888c87b 906 dev_dbg(chip->dev, "Another process owns this TPM\n");
1da177e4
LT		 907 rc = -EBUSY;
908 goto err_out;
909 }
910
911 chip->num_opens++;
e659a3fe 912 get_device(chip->dev);
1da177e4
LT		 913
914 spin_unlock(&driver_lock);
915
916 chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
917 if (chip->data_buffer == NULL) {
918 chip->num_opens--;
e659a3fe 919 put_device(chip->dev);
1da177e4
LT		 920 return -ENOMEM;
921 }
922
923 atomic_set(&chip->data_pending, 0);
924
925 file->private_data = chip;
926 return 0;
927
928err_out:
929 spin_unlock(&driver_lock);
930 return rc;
931}
1da177e4
LT		 932EXPORT_SYMBOL_GPL(tpm_open);
933
934int tpm_release(struct inode *inode, struct file *file)
935{
936 struct tpm_chip *chip = file->private_data;
1da177e4
LT		 937
938 spin_lock(&driver_lock);
5e976d55 939 file->private_data = NULL;
1da177e4 940 chip->num_opens--;
fe3fd483 941 del_singleshot_timer_sync(&chip->user_read_timer);
ba396115 942 flush_scheduled_work();
1da177e4 943 atomic_set(&chip->data_pending, 0);
e659a3fe 944 put_device(chip->dev);
5e976d55
KH		 945 kfree(chip->data_buffer);
946 spin_unlock(&driver_lock);
1da177e4
LT		 947 return 0;
948}
1da177e4
LT		 949EXPORT_SYMBOL_GPL(tpm_release);
950
b888c87b 951ssize_t tpm_write(struct file *file, const char __user *buf,
3c2f606a 952 size_t size, loff_t *off)
1da177e4
LT		 953{
954 struct tpm_chip *chip = file->private_data;
955 int in_size = size, out_size;
956
957 /* cannot perform a write until the read has cleared
958 either via tpm_read or a user_read_timer timeout */
700d8bdc
NA		 959 while (atomic_read(&chip->data_pending) != 0)
960 msleep(TPM_TIMEOUT);
1da177e4
LT		 961
962 down(&chip->buffer_mutex);
963
964 if (in_size > TPM_BUFSIZE)
965 in_size = TPM_BUFSIZE;
966
967 if (copy_from_user
968 (chip->data_buffer, (void __user *) buf, in_size)) {
969 up(&chip->buffer_mutex);
970 return -EFAULT;
971 }
972
973 /* atomic tpm command send and result receive */
974 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
975
976 atomic_set(&chip->data_pending, out_size);
977 up(&chip->buffer_mutex);
978
979 /* Set a timeout by which the reader must come claim the result */
fe3fd483 980 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1da177e4
LT		 981
982 return in_size;
983}
1da177e4
LT		 984EXPORT_SYMBOL_GPL(tpm_write);
985
3c2f606a
KJH		 986ssize_t tpm_read(struct file *file, char __user *buf,
987 size_t size, loff_t *off)
1da177e4
LT		 988{
989 struct tpm_chip *chip = file->private_data;
5b44bd58 990 int ret_size;
1da177e4 991
5b44bd58 992 del_singleshot_timer_sync(&chip->user_read_timer);
ba396115 993 flush_scheduled_work();
5b44bd58
KH		 994 ret_size = atomic_read(&chip->data_pending);
995 atomic_set(&chip->data_pending, 0);
996 if (ret_size > 0) { /* relay data */
997 if (size < ret_size)
998 ret_size = size;
1da177e4
LT		 999
1000 down(&chip->buffer_mutex);
f6a2382c 1001 if (copy_to_user(buf, chip->data_buffer, ret_size))
5b44bd58 1002 ret_size = -EFAULT;
1da177e4
LT		 1003 up(&chip->buffer_mutex);
1004 }
1005
1006 return ret_size;
1007}
1da177e4
LT		 1008EXPORT_SYMBOL_GPL(tpm_read);
1009
e659a3fe 1010void tpm_remove_hardware(struct device *dev)
1da177e4 1011{
e659a3fe 1012 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1013
1014 if (chip == NULL) {
e659a3fe 1015 dev_err(dev, "No device data found\n");
1da177e4
LT		 1016 return;
1017 }
1018
1019 spin_lock(&driver_lock);
1020
1021 list_del(&chip->list);
1022
1023 spin_unlock(&driver_lock);
1024
e659a3fe 1025 dev_set_drvdata(dev, NULL);
90dda520
KJH		 1026 misc_deregister(&chip->vendor.miscdev);
1027 kfree(chip->vendor.miscdev.name);
1da177e4 1028
90dda520 1029 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
55a82ab3 1030 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1031
90dda520
KJH		 1032 dev_mask[chip->dev_num / TPM_NUM_MASK_ENTRIES] &=
1033 ~(1 << (chip->dev_num % TPM_NUM_MASK_ENTRIES));
1da177e4
LT		 1034
1035 kfree(chip);
1036
e659a3fe 1037 put_device(dev);
1da177e4 1038}
e659a3fe 1039EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4
LT		 1040
1041static u8 savestate[] = {
1042 0, 193, /* TPM_TAG_RQU_COMMAND */
1043 0, 0, 0, 10, /* blob length (in bytes) */
1044 0, 0, 0, 152 /* TPM_ORD_SaveState */
1045};
1046
1047/*
1048 * We are about to suspend. Save the TPM state
1049 * so that it can be restored.
1050 */
ce2c87d4 1051int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1da177e4 1052{
ce2c87d4 1053 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1054 if (chip == NULL)
1055 return -ENODEV;
1056
1057 tpm_transmit(chip, savestate, sizeof(savestate));
1058 return 0;
1059}
1da177e4
LT		 1060EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1061
1062/*
1063 * Resume from a power safe. The BIOS already restored
1064 * the TPM state.
1065 */
ce2c87d4 1066int tpm_pm_resume(struct device *dev)
1da177e4 1067{
ce2c87d4 1068 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1069
1070 if (chip == NULL)
1071 return -ENODEV;
1072
1da177e4
LT		 1073 return 0;
1074}
1da177e4
LT		 1075EXPORT_SYMBOL_GPL(tpm_pm_resume);
1076
1077/*
1078 * Called from tpm_<specific>.c probe function only for devices
1079 * the driver has determined it should claim. Prior to calling
1080 * this function the specific probe function has called pci_enable_device
1081 * upon errant exit from this function specific probe function should call
1082 * pci_disable_device
1083 */
e0dd03ca
KJH		 1084struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vendor_specific
1085 *entry)
1da177e4 1086{
6f9beccb
KJH		 1087#define DEVNAME_SIZE 7
1088
1089 char *devname;
1da177e4
LT		 1090 struct tpm_chip *chip;
1091 int i, j;
1092
1093 /* Driver specific per-device data */
b888c87b 1094 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1da177e4 1095 if (chip == NULL)
e0dd03ca 1096 return NULL;
1da177e4 1097
1da177e4
LT		 1098 init_MUTEX(&chip->buffer_mutex);
1099 init_MUTEX(&chip->tpm_mutex);
1da177e4
LT		 1100 INIT_LIST_HEAD(&chip->list);
1101
09e12f9f
KJH		 1102 INIT_WORK(&chip->work, timeout_work, chip);
1103
fe3fd483
KH		 1104 init_timer(&chip->user_read_timer);
1105 chip->user_read_timer.function = user_reader_timeout;
1106 chip->user_read_timer.data = (unsigned long) chip;
1107
90dda520 1108 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4
LT		 1109
1110 chip->dev_num = -1;
1111
3122a88a
KH		 1112 for (i = 0; i < TPM_NUM_MASK_ENTRIES; i++)
1113 for (j = 0; j < 8 * sizeof(int); j++)
1da177e4 1114 if ((dev_mask[i] & (1 << j)) == 0) {
3122a88a
KH		 1115 chip->dev_num =
1116 i * TPM_NUM_MASK_ENTRIES + j;
1da177e4
LT		 1117 dev_mask[i] |= 1 << j;
1118 goto dev_num_search_complete;
1119 }
1120
1121dev_num_search_complete:
1122 if (chip->dev_num < 0) {
b888c87b 1123 dev_err(dev, "No available tpm device numbers\n");
1da177e4 1124 kfree(chip);
e0dd03ca 1125 return NULL;
1da177e4 1126 } else if (chip->dev_num == 0)
90dda520 1127 chip->vendor.miscdev.minor = TPM_MINOR;
1da177e4 1128 else
90dda520 1129 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1da177e4 1130
6f9beccb
KJH		 1131 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1132 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
90dda520 1133 chip->vendor.miscdev.name = devname;
1da177e4 1134
90dda520 1135 chip->vendor.miscdev.dev = dev;
e659a3fe 1136 chip->dev = get_device(dev);
1da177e4 1137
90dda520 1138 if (misc_register(&chip->vendor.miscdev)) {
e659a3fe 1139 dev_err(chip->dev,
1da177e4 1140 "unable to misc_register %s, minor %d\n",
90dda520
KJH		 1141 chip->vendor.miscdev.name,
1142 chip->vendor.miscdev.minor);
e659a3fe 1143 put_device(dev);
1da177e4
LT		 1144 kfree(chip);
1145 dev_mask[i] &= !(1 << j);
e0dd03ca 1146 return NULL;
1da177e4
LT		 1147 }
1148
5e976d55
KH		 1149 spin_lock(&driver_lock);
1150
e659a3fe 1151 dev_set_drvdata(dev, chip);
1da177e4
LT		 1152
1153 list_add(&chip->list, &tpm_chip_list);
1154
5e976d55
KH		 1155 spin_unlock(&driver_lock);
1156
90dda520 1157 sysfs_create_group(&dev->kobj, chip->vendor.attr_group);
1da177e4 1158
55a82ab3
KJH		 1159 chip->bios_dir = tpm_bios_log_setup(devname);
1160
e0dd03ca 1161 return chip;
1da177e4 1162}
1da177e4
LT		 1163EXPORT_SYMBOL_GPL(tpm_register_hardware);
1164
1da177e4
LT		 1165MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1166MODULE_DESCRIPTION("TPM Driver");
1167MODULE_VERSION("2.0");
1168MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)