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[PATCH] tpm: driver for next generation TPM chips
[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
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:
1da177e4 424 up(&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
431#define TPM_GET_CAP_RET_SIZE_IDX 10
432#define TPM_GET_CAP_RET_UINT32_1_IDX 14
433#define TPM_GET_CAP_RET_UINT32_2_IDX 18
434#define TPM_GET_CAP_RET_UINT32_3_IDX 22
435#define TPM_GET_CAP_RET_UINT32_4_IDX 26
08e96e48
KJH		 436#define TPM_GET_CAP_PERM_DISABLE_IDX 16
437#define TPM_GET_CAP_PERM_INACTIVE_IDX 18
438#define TPM_GET_CAP_RET_BOOL_1_IDX 14
439#define TPM_GET_CAP_TEMP_INACTIVE_IDX 16
beed53a1
KJH		 440
441#define TPM_CAP_IDX 13
442#define TPM_CAP_SUBCAP_IDX 21
443
444enum tpm_capabilities {
08e96e48 445 TPM_CAP_FLAG = 4,
beed53a1
KJH		 446 TPM_CAP_PROP = 5,
447};
448
449enum tpm_sub_capabilities {
450 TPM_CAP_PROP_PCR = 0x1,
451 TPM_CAP_PROP_MANUFACTURER = 0x3,
08e96e48
KJH		 452 TPM_CAP_FLAG_PERM = 0x8,
453 TPM_CAP_FLAG_VOL = 0x9,
454 TPM_CAP_PROP_OWNER = 0x11,
455 TPM_CAP_PROP_TIS_TIMEOUT = 0x15,
456 TPM_CAP_PROP_TIS_DURATION = 0x20,
beed53a1
KJH		 457};
458
459/*
460 * This is a semi generic GetCapability command for use
461 * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG
462 * and their associated sub_capabilities.
463 */
464
465static const u8 tpm_cap[] = {
1da177e4
LT		 466 0, 193, /* TPM_TAG_RQU_COMMAND */
467 0, 0, 0, 22, /* length */
468 0, 0, 0, 101, /* TPM_ORD_GetCapability */
beed53a1
KJH		 469 0, 0, 0, 0, /* TPM_CAP_<TYPE> */
470 0, 0, 0, 4, /* TPM_CAP_SUB_<TYPE> size */
471 0, 0, 1, 0 /* TPM_CAP_SUB_<TYPE> */
1da177e4
LT		 472};
473
beed53a1
KJH		 474static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len,
475 char *desc)
476{
477 int err;
478
479 len = tpm_transmit(chip, data, len);
480 if (len < 0)
481 return len;
482 if (len == TPM_ERROR_SIZE) {
483 err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)));
484 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
485 return err;
486 }
487 return 0;
488}
489
08e96e48
KJH		 490void tpm_gen_interrupt(struct tpm_chip *chip)
491{
492 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
493 ssize_t rc;
494
495 memcpy(data, tpm_cap, sizeof(tpm_cap));
496 data[TPM_CAP_IDX] = TPM_CAP_PROP;
497 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
498
499 rc = transmit_cmd(chip, data, sizeof(data),
500 "attempting to determine the timeouts");
501}
502EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
503
504void tpm_get_timeouts(struct tpm_chip *chip)
505{
506 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
507 ssize_t rc;
508 u32 timeout;
509
510 memcpy(data, tpm_cap, sizeof(tpm_cap));
511 data[TPM_CAP_IDX] = TPM_CAP_PROP;
512 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
513
514 rc = transmit_cmd(chip, data, sizeof(data),
515 "attempting to determine the timeouts");
516 if (rc)
517 goto duration;
518
519 if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
520 != 4 * sizeof(u32))
521 goto duration;
522
523 /* Don't overwrite default if value is 0 */
524 timeout =
525 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)));
526 if (timeout)
527 chip->vendor.timeout_a = timeout;
528 timeout =
529 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)));
530 if (timeout)
531 chip->vendor.timeout_b = timeout;
532 timeout =
533 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)));
534 if (timeout)
535 chip->vendor.timeout_c = timeout;
536 timeout =
537 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX)));
538 if (timeout)
539 chip->vendor.timeout_d = timeout;
540
541duration:
542 memcpy(data, tpm_cap, sizeof(tpm_cap));
543 data[TPM_CAP_IDX] = TPM_CAP_PROP;
544 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_DURATION;
545
546 rc = transmit_cmd(chip, data, sizeof(data),
547 "attempting to determine the durations");
548 if (rc)
549 return;
550
551 if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
552 != 3 * sizeof(u32))
553 return;
554
555 chip->vendor.duration[TPM_SHORT] =
556 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)));
557 chip->vendor.duration[TPM_MEDIUM] =
558 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)));
559 chip->vendor.duration[TPM_LONG] =
560 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)));
561}
562EXPORT_SYMBOL_GPL(tpm_get_timeouts);
563
564void tpm_continue_selftest(struct tpm_chip *chip)
565{
566 u8 data[] = {
567 0, 193, /* TPM_TAG_RQU_COMMAND */
568 0, 0, 0, 10, /* length */
569 0, 0, 0, 83, /* TPM_ORD_GetCapability */
570 };
571
572 tpm_transmit(chip, data, sizeof(data));
573}
574EXPORT_SYMBOL_GPL(tpm_continue_selftest);
575
576ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
577 char *buf)
578{
579 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)];
580 ssize_t rc;
581
582 struct tpm_chip *chip = dev_get_drvdata(dev);
583 if (chip == NULL)
584 return -ENODEV;
585
586 memcpy(data, tpm_cap, sizeof(tpm_cap));
587 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
588 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
589
590 rc = transmit_cmd(chip, data, sizeof(data),
591 "attemtping to determine the permanent state");
592 if (rc)
593 return 0;
594 return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]);
595}
596EXPORT_SYMBOL_GPL(tpm_show_enabled);
597
598ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
599 char *buf)
600{
601 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)];
602 ssize_t rc;
603
604 struct tpm_chip *chip = dev_get_drvdata(dev);
605 if (chip == NULL)
606 return -ENODEV;
607
608 memcpy(data, tpm_cap, sizeof(tpm_cap));
609 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
610 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
611
612 rc = transmit_cmd(chip, data, sizeof(data),
613 "attemtping to determine the permanent state");
614 if (rc)
615 return 0;
616 return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]);
617}
618EXPORT_SYMBOL_GPL(tpm_show_active);
619
620ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
621 char *buf)
622{
623 u8 data[sizeof(tpm_cap)];
624 ssize_t rc;
625
626 struct tpm_chip *chip = dev_get_drvdata(dev);
627 if (chip == NULL)
628 return -ENODEV;
629
630 memcpy(data, tpm_cap, sizeof(tpm_cap));
631 data[TPM_CAP_IDX] = TPM_CAP_PROP;
632 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER;
633
634 rc = transmit_cmd(chip, data, sizeof(data),
635 "attempting to determine the owner state");
636 if (rc)
637 return 0;
638 return sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]);
639}
640EXPORT_SYMBOL_GPL(tpm_show_owned);
641
642ssize_t tpm_show_temp_deactivated(struct device * dev,
643 struct device_attribute * attr, char *buf)
644{
645 u8 data[sizeof(tpm_cap)];
646 ssize_t rc;
647
648 struct tpm_chip *chip = dev_get_drvdata(dev);
649 if (chip == NULL)
650 return -ENODEV;
651
652 memcpy(data, tpm_cap, sizeof(tpm_cap));
653 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
654 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL;
655
656 rc = transmit_cmd(chip, data, sizeof(data),
657 "attempting to determine the temporary state");
658 if (rc)
659 return 0;
660 return sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]);
661}
662EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
663
dff37e4b 664static const u8 pcrread[] = {
1da177e4
LT		 665 0, 193, /* TPM_TAG_RQU_COMMAND */
666 0, 0, 0, 14, /* length */
667 0, 0, 0, 21, /* TPM_ORD_PcrRead */
668 0, 0, 0, 0 /* PCR index */
669};
670
6659ca2a
KH		 671ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
672 char *buf)
1da177e4 673{
08e96e48 674 u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(pcrread)), 30)];
beed53a1 675 ssize_t rc;
81179bb6
KH		 676 int i, j, num_pcrs;
677 __be32 index;
1da177e4
LT		 678 char *str = buf;
679
e659a3fe 680 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 681 if (chip == NULL)
682 return -ENODEV;
683
beed53a1
KJH		 684 memcpy(data, tpm_cap, sizeof(tpm_cap));
685 data[TPM_CAP_IDX] = TPM_CAP_PROP;
686 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR;
687
688 rc = transmit_cmd(chip, data, sizeof(data),
689 "attempting to determine the number of PCRS");
690 if (rc)
e234bc97 691 return 0;
1da177e4 692
81179bb6 693 num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));
1da177e4
LT		 694 for (i = 0; i < num_pcrs; i++) {
695 memcpy(data, pcrread, sizeof(pcrread));
696 index = cpu_to_be32(i);
697 memcpy(data + 10, &index, 4);
beed53a1
KJH		 698 rc = transmit_cmd(chip, data, sizeof(data),
699 "attempting to read a PCR");
700 if (rc)
e234bc97 701 goto out;
1da177e4
LT		 702 str += sprintf(str, "PCR-%02d: ", i);
703 for (j = 0; j < TPM_DIGEST_SIZE; j++)
704 str += sprintf(str, "%02X ", *(data + 10 + j));
705 str += sprintf(str, "\n");
706 }
e234bc97 707out:
1da177e4
LT		 708 return str - buf;
709}
6659ca2a 710EXPORT_SYMBOL_GPL(tpm_show_pcrs);
1da177e4
LT		 711
712#define READ_PUBEK_RESULT_SIZE 314
dff37e4b 713static const u8 readpubek[] = {
1da177e4
LT		 714 0, 193, /* TPM_TAG_RQU_COMMAND */
715 0, 0, 0, 30, /* length */
716 0, 0, 0, 124, /* TPM_ORD_ReadPubek */
717};
718
6659ca2a
KH		 719ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
720 char *buf)
1da177e4 721{
2df7111f 722 u8 *data;
beed53a1 723 ssize_t err;
81179bb6 724 int i, rc;
1da177e4
LT		 725 char *str = buf;
726
e659a3fe 727 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 728 if (chip == NULL)
729 return -ENODEV;
730
b888c87b 731 data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);
2df7111f
KH		 732 if (!data)
733 return -ENOMEM;
734
1da177e4 735 memcpy(data, readpubek, sizeof(readpubek));
1da177e4 736
beed53a1
KJH		 737 err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE,
738 "attempting to read the PUBEK");
739 if (err)
34d6e075 740 goto out;
1da177e4
LT		 741
742 /*
743 ignore header 10 bytes
744 algorithm 32 bits (1 == RSA )
745 encscheme 16 bits
746 sigscheme 16 bits
747 parameters (RSA 12->bytes: keybit, #primes, expbit)
748 keylenbytes 32 bits
749 256 byte modulus
750 ignore checksum 20 bytes
751 */
752
1da177e4
LT		 753 str +=
754 sprintf(str,
755 "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
756 "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
757 " %02X %02X %02X %02X %02X %02X %02X %02X\n"
758 "Modulus length: %d\nModulus: \n",
759 data[10], data[11], data[12], data[13], data[14],
760 data[15], data[16], data[17], data[22], data[23],
761 data[24], data[25], data[26], data[27], data[28],
762 data[29], data[30], data[31], data[32], data[33],
1dda8abe 763 be32_to_cpu(*((__be32 *) (data + 34))));
1da177e4
LT		 764
765 for (i = 0; i < 256; i++) {
1dda8abe 766 str += sprintf(str, "%02X ", data[i + 38]);
1da177e4
LT		 767 if ((i + 1) % 16 == 0)
768 str += sprintf(str, "\n");
769 }
34d6e075 770out:
beed53a1 771 rc = str - buf;
2df7111f
KH		 772 kfree(data);
773 return rc;
1da177e4 774}
6659ca2a 775EXPORT_SYMBOL_GPL(tpm_show_pubek);
1da177e4 776
beed53a1 777#define CAP_VERSION_1_1 6
08e96e48 778#define CAP_VERSION_1_2 0x1A
beed53a1 779#define CAP_VERSION_IDX 13
dff37e4b 780static const u8 cap_version[] = {
1da177e4
LT		 781 0, 193, /* TPM_TAG_RQU_COMMAND */
782 0, 0, 0, 18, /* length */
783 0, 0, 0, 101, /* TPM_ORD_GetCapability */
beed53a1 784 0, 0, 0, 0,
1da177e4
LT		 785 0, 0, 0, 0
786};
787
6659ca2a
KH		 788ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
789 char *buf)
1da177e4 790{
08e96e48 791 u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)];
beed53a1 792 ssize_t rc;
1da177e4
LT		 793 char *str = buf;
794
e659a3fe 795 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 796 if (chip == NULL)
797 return -ENODEV;
798
beed53a1
KJH		 799 memcpy(data, tpm_cap, sizeof(tpm_cap));
800 data[TPM_CAP_IDX] = TPM_CAP_PROP;
801 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
1da177e4 802
beed53a1
KJH		 803 rc = transmit_cmd(chip, data, sizeof(data),
804 "attempting to determine the manufacturer");
805 if (rc)
806 return 0;
1da177e4
LT		 807
808 str += sprintf(str, "Manufacturer: 0x%x\n",
beed53a1 809 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
1da177e4
LT		 810
811 memcpy(data, cap_version, sizeof(cap_version));
beed53a1
KJH		 812 data[CAP_VERSION_IDX] = CAP_VERSION_1_1;
813 rc = transmit_cmd(chip, data, sizeof(data),
814 "attempting to determine the 1.1 version");
815 if (rc)
816 goto out;
1da177e4 817
beed53a1
KJH		 818 str += sprintf(str,
819 "TCG version: %d.%d\nFirmware version: %d.%d\n",
820 (int) data[14], (int) data[15], (int) data[16],
821 (int) data[17]);
1da177e4 822
beed53a1 823out:
1da177e4
LT		 824 return str - buf;
825}
6659ca2a
KH		 826EXPORT_SYMBOL_GPL(tpm_show_caps);
827
08e96e48
KJH		 828ssize_t tpm_show_caps_1_2(struct device * dev,
829 struct device_attribute * attr, char *buf)
830{
831 u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)];
832 ssize_t len;
833 char *str = buf;
834
835 struct tpm_chip *chip = dev_get_drvdata(dev);
836 if (chip == NULL)
837 return -ENODEV;
838
839 memcpy(data, tpm_cap, sizeof(tpm_cap));
840 data[TPM_CAP_IDX] = TPM_CAP_PROP;
841 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
842
843 if ((len = tpm_transmit(chip, data, sizeof(data))) <=
844 TPM_ERROR_SIZE) {
845 dev_dbg(chip->dev, "A TPM error (%d) occurred "
846 "attempting to determine the manufacturer\n",
847 be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
848 return 0;
849 }
850
851 str += sprintf(str, "Manufacturer: 0x%x\n",
852 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
853
854 memcpy(data, cap_version, sizeof(cap_version));
855 data[CAP_VERSION_IDX] = CAP_VERSION_1_2;
856
857 if ((len = tpm_transmit(chip, data, sizeof(data))) <=
858 TPM_ERROR_SIZE) {
859 dev_err(chip->dev, "A TPM error (%d) occurred "
860 "attempting to determine the 1.2 version\n",
861 be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
862 goto out;
863 }
864 str += sprintf(str,
865 "TCG version: %d.%d\nFirmware version: %d.%d\n",
866 (int) data[16], (int) data[17], (int) data[18],
867 (int) data[19]);
868
869out:
870 return str - buf;
871}
872EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
873
6659ca2a
KH		 874ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
875 const char *buf, size_t count)
876{
877 struct tpm_chip *chip = dev_get_drvdata(dev);
878 if (chip == NULL)
879 return 0;
880
90dda520 881 chip->vendor.cancel(chip);
6659ca2a
KH		 882 return count;
883}
884EXPORT_SYMBOL_GPL(tpm_store_cancel);
1da177e4 885
1da177e4
LT		 886/*
887 * Device file system interface to the TPM
888 */
889int tpm_open(struct inode *inode, struct file *file)
890{
891 int rc = 0, minor = iminor(inode);
892 struct tpm_chip *chip = NULL, *pos;
893
894 spin_lock(&driver_lock);
895
896 list_for_each_entry(pos, &tpm_chip_list, list) {
90dda520 897 if (pos->vendor.miscdev.minor == minor) {
1da177e4
LT		 898 chip = pos;
899 break;
900 }
901 }
902
903 if (chip == NULL) {
904 rc = -ENODEV;
905 goto err_out;
906 }
907
908 if (chip->num_opens) {
b888c87b 909 dev_dbg(chip->dev, "Another process owns this TPM\n");
1da177e4
LT		 910 rc = -EBUSY;
911 goto err_out;
912 }
913
914 chip->num_opens++;
e659a3fe 915 get_device(chip->dev);
1da177e4
LT		 916
917 spin_unlock(&driver_lock);
918
919 chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
920 if (chip->data_buffer == NULL) {
921 chip->num_opens--;
e659a3fe 922 put_device(chip->dev);
1da177e4
LT		 923 return -ENOMEM;
924 }
925
926 atomic_set(&chip->data_pending, 0);
927
928 file->private_data = chip;
929 return 0;
930
931err_out:
932 spin_unlock(&driver_lock);
933 return rc;
934}
1da177e4
LT		 935EXPORT_SYMBOL_GPL(tpm_open);
936
937int tpm_release(struct inode *inode, struct file *file)
938{
939 struct tpm_chip *chip = file->private_data;
1da177e4
LT		 940
941 spin_lock(&driver_lock);
5e976d55 942 file->private_data = NULL;
1da177e4 943 chip->num_opens--;
fe3fd483 944 del_singleshot_timer_sync(&chip->user_read_timer);
ba396115 945 flush_scheduled_work();
1da177e4 946 atomic_set(&chip->data_pending, 0);
e659a3fe 947 put_device(chip->dev);
5e976d55
KH		 948 kfree(chip->data_buffer);
949 spin_unlock(&driver_lock);
1da177e4
LT		 950 return 0;
951}
1da177e4
LT		 952EXPORT_SYMBOL_GPL(tpm_release);
953
b888c87b 954ssize_t tpm_write(struct file *file, const char __user *buf,
3c2f606a 955 size_t size, loff_t *off)
1da177e4
LT		 956{
957 struct tpm_chip *chip = file->private_data;
958 int in_size = size, out_size;
959
960 /* cannot perform a write until the read has cleared
961 either via tpm_read or a user_read_timer timeout */
700d8bdc
NA		 962 while (atomic_read(&chip->data_pending) != 0)
963 msleep(TPM_TIMEOUT);
1da177e4
LT		 964
965 down(&chip->buffer_mutex);
966
967 if (in_size > TPM_BUFSIZE)
968 in_size = TPM_BUFSIZE;
969
970 if (copy_from_user
971 (chip->data_buffer, (void __user *) buf, in_size)) {
972 up(&chip->buffer_mutex);
973 return -EFAULT;
974 }
975
976 /* atomic tpm command send and result receive */
977 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
978
979 atomic_set(&chip->data_pending, out_size);
980 up(&chip->buffer_mutex);
981
982 /* Set a timeout by which the reader must come claim the result */
fe3fd483 983 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1da177e4
LT		 984
985 return in_size;
986}
1da177e4
LT		 987EXPORT_SYMBOL_GPL(tpm_write);
988
3c2f606a
KJH		 989ssize_t tpm_read(struct file *file, char __user *buf,
990 size_t size, loff_t *off)
1da177e4
LT		 991{
992 struct tpm_chip *chip = file->private_data;
5b44bd58 993 int ret_size;
1da177e4 994
5b44bd58 995 del_singleshot_timer_sync(&chip->user_read_timer);
ba396115 996 flush_scheduled_work();
5b44bd58
KH		 997 ret_size = atomic_read(&chip->data_pending);
998 atomic_set(&chip->data_pending, 0);
999 if (ret_size > 0) { /* relay data */
1000 if (size < ret_size)
1001 ret_size = size;
1da177e4
LT		 1002
1003 down(&chip->buffer_mutex);
f6a2382c 1004 if (copy_to_user(buf, chip->data_buffer, ret_size))
5b44bd58 1005 ret_size = -EFAULT;
1da177e4
LT		 1006 up(&chip->buffer_mutex);
1007 }
1008
1009 return ret_size;
1010}
1da177e4
LT		 1011EXPORT_SYMBOL_GPL(tpm_read);
1012
e659a3fe 1013void tpm_remove_hardware(struct device *dev)
1da177e4 1014{
e659a3fe 1015 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1016
1017 if (chip == NULL) {
e659a3fe 1018 dev_err(dev, "No device data found\n");
1da177e4
LT		 1019 return;
1020 }
1021
1022 spin_lock(&driver_lock);
1023
1024 list_del(&chip->list);
1025
1026 spin_unlock(&driver_lock);
1027
e659a3fe 1028 dev_set_drvdata(dev, NULL);
90dda520
KJH		 1029 misc_deregister(&chip->vendor.miscdev);
1030 kfree(chip->vendor.miscdev.name);
1da177e4 1031
90dda520 1032 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
55a82ab3 1033 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1034
90dda520
KJH		 1035 dev_mask[chip->dev_num / TPM_NUM_MASK_ENTRIES] &=
1036 ~(1 << (chip->dev_num % TPM_NUM_MASK_ENTRIES));
1da177e4
LT		 1037
1038 kfree(chip);
1039
e659a3fe 1040 put_device(dev);
1da177e4 1041}
e659a3fe 1042EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4
LT		 1043
1044static u8 savestate[] = {
1045 0, 193, /* TPM_TAG_RQU_COMMAND */
1046 0, 0, 0, 10, /* blob length (in bytes) */
1047 0, 0, 0, 152 /* TPM_ORD_SaveState */
1048};
1049
1050/*
1051 * We are about to suspend. Save the TPM state
1052 * so that it can be restored.
1053 */
ce2c87d4 1054int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1da177e4 1055{
ce2c87d4 1056 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1057 if (chip == NULL)
1058 return -ENODEV;
1059
1060 tpm_transmit(chip, savestate, sizeof(savestate));
1061 return 0;
1062}
1da177e4
LT		 1063EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1064
1065/*
1066 * Resume from a power safe. The BIOS already restored
1067 * the TPM state.
1068 */
ce2c87d4 1069int tpm_pm_resume(struct device *dev)
1da177e4 1070{
ce2c87d4 1071 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1072
1073 if (chip == NULL)
1074 return -ENODEV;
1075
1da177e4
LT		 1076 return 0;
1077}
1da177e4
LT		 1078EXPORT_SYMBOL_GPL(tpm_pm_resume);
1079
1080/*
1081 * Called from tpm_<specific>.c probe function only for devices
1082 * the driver has determined it should claim. Prior to calling
1083 * this function the specific probe function has called pci_enable_device
1084 * upon errant exit from this function specific probe function should call
1085 * pci_disable_device
1086 */
e0dd03ca
KJH		 1087struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vendor_specific
1088 *entry)
1da177e4 1089{
6f9beccb
KJH		 1090#define DEVNAME_SIZE 7
1091
1092 char *devname;
1da177e4
LT		 1093 struct tpm_chip *chip;
1094 int i, j;
1095
1096 /* Driver specific per-device data */
b888c87b 1097 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1da177e4 1098 if (chip == NULL)
e0dd03ca 1099 return NULL;
1da177e4 1100
1da177e4
LT		 1101 init_MUTEX(&chip->buffer_mutex);
1102 init_MUTEX(&chip->tpm_mutex);
1da177e4
LT		 1103 INIT_LIST_HEAD(&chip->list);
1104
09e12f9f
KJH		 1105 INIT_WORK(&chip->work, timeout_work, chip);
1106
fe3fd483
KH		 1107 init_timer(&chip->user_read_timer);
1108 chip->user_read_timer.function = user_reader_timeout;
1109 chip->user_read_timer.data = (unsigned long) chip;
1110
90dda520 1111 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4
LT		 1112
1113 chip->dev_num = -1;
1114
3122a88a
KH		 1115 for (i = 0; i < TPM_NUM_MASK_ENTRIES; i++)
1116 for (j = 0; j < 8 * sizeof(int); j++)
1da177e4 1117 if ((dev_mask[i] & (1 << j)) == 0) {
3122a88a
KH		 1118 chip->dev_num =
1119 i * TPM_NUM_MASK_ENTRIES + j;
1da177e4
LT		 1120 dev_mask[i] |= 1 << j;
1121 goto dev_num_search_complete;
1122 }
1123
1124dev_num_search_complete:
1125 if (chip->dev_num < 0) {
b888c87b 1126 dev_err(dev, "No available tpm device numbers\n");
1da177e4 1127 kfree(chip);
e0dd03ca 1128 return NULL;
1da177e4 1129 } else if (chip->dev_num == 0)
90dda520 1130 chip->vendor.miscdev.minor = TPM_MINOR;
1da177e4 1131 else
90dda520 1132 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1da177e4 1133
6f9beccb
KJH		 1134 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1135 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
90dda520 1136 chip->vendor.miscdev.name = devname;
1da177e4 1137
90dda520 1138 chip->vendor.miscdev.dev = dev;
e659a3fe 1139 chip->dev = get_device(dev);
1da177e4 1140
90dda520 1141 if (misc_register(&chip->vendor.miscdev)) {
e659a3fe 1142 dev_err(chip->dev,
1da177e4 1143 "unable to misc_register %s, minor %d\n",
90dda520
KJH		 1144 chip->vendor.miscdev.name,
1145 chip->vendor.miscdev.minor);
e659a3fe 1146 put_device(dev);
1da177e4
LT		 1147 kfree(chip);
1148 dev_mask[i] &= !(1 << j);
e0dd03ca 1149 return NULL;
1da177e4
LT		 1150 }
1151
5e976d55
KH		 1152 spin_lock(&driver_lock);
1153
e659a3fe 1154 dev_set_drvdata(dev, chip);
1da177e4
LT		 1155
1156 list_add(&chip->list, &tpm_chip_list);
1157
5e976d55
KH		 1158 spin_unlock(&driver_lock);
1159
90dda520 1160 sysfs_create_group(&dev->kobj, chip->vendor.attr_group);
1da177e4 1161
55a82ab3
KJH		 1162 chip->bios_dir = tpm_bios_log_setup(devname);
1163
e0dd03ca 1164 return chip;
1da177e4 1165}
1da177e4
LT		 1166EXPORT_SYMBOL_GPL(tpm_register_hardware);
1167
1da177e4
LT		 1168MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1169MODULE_DESCRIPTION("TPM Driver");
1170MODULE_VERSION("2.0");
1171MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)