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Merge branch 'rcu-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / char / tpm / tpm.c
CommitLineData
1da177e4
LT		 1/*
2 * Copyright (C) 2004 IBM Corporation
3 *
4 * Authors:
5 * Leendert van Doorn <leendert@watson.ibm.com>
6 * Dave Safford <safford@watson.ibm.com>
7 * Reiner Sailer <sailer@watson.ibm.com>
8 * Kylene Hall <kjhall@us.ibm.com>
9 *
8e81cc13 10 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
1da177e4
LT		 11 *
12 * Device driver for TCG/TCPA TPM (trusted platform module).
13 * Specifications at www.trustedcomputinggroup.org
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation, version 2 of the
18 * License.
19 *
20 * Note, the TPM chip is not interrupt driven (only polling)
21 * and can have very long timeouts (minutes!). Hence the unusual
700d8bdc 22 * calls to msleep.
1da177e4
LT		 23 *
24 */
25
1da177e4 26#include <linux/poll.h>
d081d470 27#include <linux/mutex.h>
1da177e4 28#include <linux/spinlock.h>
25368ca5 29#include <linux/smp_lock.h>
d081d470 30
1da177e4
LT		 31#include "tpm.h"
32
3122a88a
KH		 33enum tpm_const {
34 TPM_MINOR = 224, /* officially assigned */
35 TPM_BUFSIZE = 2048,
36 TPM_NUM_DEVICES = 256,
3122a88a 37};
1da177e4 38
9e18ee19
KJH		 39enum tpm_duration {
40 TPM_SHORT = 0,
41 TPM_MEDIUM = 1,
42 TPM_LONG = 2,
43 TPM_UNDEFINED,
44};
45
46#define TPM_MAX_ORDINAL 243
47#define TPM_MAX_PROTECTED_ORDINAL 12
48#define TPM_PROTECTED_ORDINAL_MASK 0xFF
49
1da177e4
LT		 50static LIST_HEAD(tpm_chip_list);
51static DEFINE_SPINLOCK(driver_lock);
10685a95 52static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
1da177e4 53
9e18ee19
KJH		 54/*
55 * Array with one entry per ordinal defining the maximum amount
56 * of time the chip could take to return the result. The ordinal
57 * designation of short, medium or long is defined in a table in
58 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
59 * values of the SHORT, MEDIUM, and LONG durations are retrieved
60 * from the chip during initialization with a call to tpm_get_timeouts.
61 */
62static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
63 TPM_UNDEFINED, /* 0 */
64 TPM_UNDEFINED,
65 TPM_UNDEFINED,
66 TPM_UNDEFINED,
67 TPM_UNDEFINED,
68 TPM_UNDEFINED, /* 5 */
69 TPM_UNDEFINED,
70 TPM_UNDEFINED,
71 TPM_UNDEFINED,
72 TPM_UNDEFINED,
73 TPM_SHORT, /* 10 */
74 TPM_SHORT,
75};
76
77static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
78 TPM_UNDEFINED, /* 0 */
79 TPM_UNDEFINED,
80 TPM_UNDEFINED,
81 TPM_UNDEFINED,
82 TPM_UNDEFINED,
83 TPM_UNDEFINED, /* 5 */
84 TPM_UNDEFINED,
85 TPM_UNDEFINED,
86 TPM_UNDEFINED,
87 TPM_UNDEFINED,
88 TPM_SHORT, /* 10 */
89 TPM_SHORT,
90 TPM_MEDIUM,
91 TPM_LONG,
92 TPM_LONG,
93 TPM_MEDIUM, /* 15 */
94 TPM_SHORT,
95 TPM_SHORT,
96 TPM_MEDIUM,
97 TPM_LONG,
98 TPM_SHORT, /* 20 */
99 TPM_SHORT,
100 TPM_MEDIUM,
101 TPM_MEDIUM,
102 TPM_MEDIUM,
103 TPM_SHORT, /* 25 */
104 TPM_SHORT,
105 TPM_MEDIUM,
106 TPM_SHORT,
107 TPM_SHORT,
108 TPM_MEDIUM, /* 30 */
109 TPM_LONG,
110 TPM_MEDIUM,
111 TPM_SHORT,
112 TPM_SHORT,
113 TPM_SHORT, /* 35 */
114 TPM_MEDIUM,
115 TPM_MEDIUM,
116 TPM_UNDEFINED,
117 TPM_UNDEFINED,
118 TPM_MEDIUM, /* 40 */
119 TPM_LONG,
120 TPM_MEDIUM,
121 TPM_SHORT,
122 TPM_SHORT,
123 TPM_SHORT, /* 45 */
124 TPM_SHORT,
125 TPM_SHORT,
126 TPM_SHORT,
127 TPM_LONG,
128 TPM_MEDIUM, /* 50 */
129 TPM_MEDIUM,
130 TPM_UNDEFINED,
131 TPM_UNDEFINED,
132 TPM_UNDEFINED,
133 TPM_UNDEFINED, /* 55 */
134 TPM_UNDEFINED,
135 TPM_UNDEFINED,
136 TPM_UNDEFINED,
137 TPM_UNDEFINED,
138 TPM_MEDIUM, /* 60 */
139 TPM_MEDIUM,
140 TPM_MEDIUM,
141 TPM_SHORT,
142 TPM_SHORT,
143 TPM_MEDIUM, /* 65 */
144 TPM_UNDEFINED,
145 TPM_UNDEFINED,
146 TPM_UNDEFINED,
147 TPM_UNDEFINED,
148 TPM_SHORT, /* 70 */
149 TPM_SHORT,
150 TPM_UNDEFINED,
151 TPM_UNDEFINED,
152 TPM_UNDEFINED,
153 TPM_UNDEFINED, /* 75 */
154 TPM_UNDEFINED,
155 TPM_UNDEFINED,
156 TPM_UNDEFINED,
157 TPM_UNDEFINED,
158 TPM_LONG, /* 80 */
159 TPM_UNDEFINED,
160 TPM_MEDIUM,
161 TPM_LONG,
162 TPM_SHORT,
163 TPM_UNDEFINED, /* 85 */
164 TPM_UNDEFINED,
165 TPM_UNDEFINED,
166 TPM_UNDEFINED,
167 TPM_UNDEFINED,
168 TPM_SHORT, /* 90 */
169 TPM_SHORT,
170 TPM_SHORT,
171 TPM_SHORT,
172 TPM_SHORT,
173 TPM_UNDEFINED, /* 95 */
174 TPM_UNDEFINED,
175 TPM_UNDEFINED,
176 TPM_UNDEFINED,
177 TPM_UNDEFINED,
178 TPM_MEDIUM, /* 100 */
179 TPM_SHORT,
180 TPM_SHORT,
181 TPM_UNDEFINED,
182 TPM_UNDEFINED,
183 TPM_UNDEFINED, /* 105 */
184 TPM_UNDEFINED,
185 TPM_UNDEFINED,
186 TPM_UNDEFINED,
187 TPM_UNDEFINED,
188 TPM_SHORT, /* 110 */
189 TPM_SHORT,
190 TPM_SHORT,
191 TPM_SHORT,
192 TPM_SHORT,
193 TPM_SHORT, /* 115 */
194 TPM_SHORT,
195 TPM_SHORT,
196 TPM_UNDEFINED,
197 TPM_UNDEFINED,
198 TPM_LONG, /* 120 */
199 TPM_LONG,
200 TPM_MEDIUM,
201 TPM_UNDEFINED,
202 TPM_SHORT,
203 TPM_SHORT, /* 125 */
204 TPM_SHORT,
205 TPM_LONG,
206 TPM_SHORT,
207 TPM_SHORT,
208 TPM_SHORT, /* 130 */
209 TPM_MEDIUM,
210 TPM_UNDEFINED,
211 TPM_SHORT,
212 TPM_MEDIUM,
213 TPM_UNDEFINED, /* 135 */
214 TPM_UNDEFINED,
215 TPM_UNDEFINED,
216 TPM_UNDEFINED,
217 TPM_UNDEFINED,
218 TPM_SHORT, /* 140 */
219 TPM_SHORT,
220 TPM_UNDEFINED,
221 TPM_UNDEFINED,
222 TPM_UNDEFINED,
223 TPM_UNDEFINED, /* 145 */
224 TPM_UNDEFINED,
225 TPM_UNDEFINED,
226 TPM_UNDEFINED,
227 TPM_UNDEFINED,
228 TPM_SHORT, /* 150 */
229 TPM_MEDIUM,
230 TPM_MEDIUM,
231 TPM_SHORT,
232 TPM_SHORT,
233 TPM_UNDEFINED, /* 155 */
234 TPM_UNDEFINED,
235 TPM_UNDEFINED,
236 TPM_UNDEFINED,
237 TPM_UNDEFINED,
238 TPM_SHORT, /* 160 */
239 TPM_SHORT,
240 TPM_SHORT,
241 TPM_SHORT,
242 TPM_UNDEFINED,
243 TPM_UNDEFINED, /* 165 */
244 TPM_UNDEFINED,
245 TPM_UNDEFINED,
246 TPM_UNDEFINED,
247 TPM_UNDEFINED,
248 TPM_LONG, /* 170 */
249 TPM_UNDEFINED,
250 TPM_UNDEFINED,
251 TPM_UNDEFINED,
252 TPM_UNDEFINED,
253 TPM_UNDEFINED, /* 175 */
254 TPM_UNDEFINED,
255 TPM_UNDEFINED,
256 TPM_UNDEFINED,
257 TPM_UNDEFINED,
258 TPM_MEDIUM, /* 180 */
259 TPM_SHORT,
260 TPM_MEDIUM,
261 TPM_MEDIUM,
262 TPM_MEDIUM,
263 TPM_MEDIUM, /* 185 */
264 TPM_SHORT,
265 TPM_UNDEFINED,
266 TPM_UNDEFINED,
267 TPM_UNDEFINED,
268 TPM_UNDEFINED, /* 190 */
269 TPM_UNDEFINED,
270 TPM_UNDEFINED,
271 TPM_UNDEFINED,
272 TPM_UNDEFINED,
273 TPM_UNDEFINED, /* 195 */
274 TPM_UNDEFINED,
275 TPM_UNDEFINED,
276 TPM_UNDEFINED,
277 TPM_UNDEFINED,
278 TPM_SHORT, /* 200 */
279 TPM_UNDEFINED,
280 TPM_UNDEFINED,
281 TPM_UNDEFINED,
282 TPM_SHORT,
283 TPM_SHORT, /* 205 */
284 TPM_SHORT,
285 TPM_SHORT,
286 TPM_SHORT,
287 TPM_SHORT,
288 TPM_MEDIUM, /* 210 */
289 TPM_UNDEFINED,
290 TPM_MEDIUM,
291 TPM_MEDIUM,
292 TPM_MEDIUM,
293 TPM_UNDEFINED, /* 215 */
294 TPM_MEDIUM,
295 TPM_UNDEFINED,
296 TPM_UNDEFINED,
297 TPM_SHORT,
298 TPM_SHORT, /* 220 */
299 TPM_SHORT,
300 TPM_SHORT,
301 TPM_SHORT,
302 TPM_SHORT,
303 TPM_UNDEFINED, /* 225 */
304 TPM_UNDEFINED,
305 TPM_UNDEFINED,
306 TPM_UNDEFINED,
307 TPM_UNDEFINED,
308 TPM_SHORT, /* 230 */
309 TPM_LONG,
310 TPM_MEDIUM,
311 TPM_UNDEFINED,
312 TPM_UNDEFINED,
313 TPM_UNDEFINED, /* 235 */
314 TPM_UNDEFINED,
315 TPM_UNDEFINED,
316 TPM_UNDEFINED,
317 TPM_UNDEFINED,
318 TPM_SHORT, /* 240 */
319 TPM_UNDEFINED,
320 TPM_MEDIUM,
321};
322
1da177e4
LT		 323static void user_reader_timeout(unsigned long ptr)
324{
325 struct tpm_chip *chip = (struct tpm_chip *) ptr;
326
09e12f9f
KJH		 327 schedule_work(&chip->work);
328}
329
c4028958 330static void timeout_work(struct work_struct *work)
09e12f9f 331{
c4028958 332 struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
09e12f9f 333
d081d470 334 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 335 atomic_set(&chip->data_pending, 0);
336 memset(chip->data_buffer, 0, TPM_BUFSIZE);
d081d470 337 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 338}
339
9e18ee19
KJH		 340/*
341 * Returns max number of jiffies to wait
342 */
343unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
344 u32 ordinal)
345{
346 int duration_idx = TPM_UNDEFINED;
347 int duration = 0;
348
349 if (ordinal < TPM_MAX_ORDINAL)
350 duration_idx = tpm_ordinal_duration[ordinal];
351 else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
352 TPM_MAX_PROTECTED_ORDINAL)
353 duration_idx =
354 tpm_protected_ordinal_duration[ordinal &
355 TPM_PROTECTED_ORDINAL_MASK];
356
357 if (duration_idx != TPM_UNDEFINED)
36b20020 358 duration = chip->vendor.duration[duration_idx];
9e18ee19
KJH		 359 if (duration <= 0)
360 return 2 * 60 * HZ;
361 else
362 return duration;
363}
364EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
365
1da177e4
LT		 366/*
367 * Internal kernel interface to transmit TPM commands
368 */
369static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
370 size_t bufsiz)
371{
d9e5b6bf 372 ssize_t rc;
9e18ee19 373 u32 count, ordinal;
700d8bdc 374 unsigned long stop;
1da177e4 375
81179bb6 376 count = be32_to_cpu(*((__be32 *) (buf + 2)));
9e18ee19 377 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
1da177e4
LT		 378 if (count == 0)
379 return -ENODATA;
380 if (count > bufsiz) {
e659a3fe 381 dev_err(chip->dev,
b76be681 382 "invalid count value %x %zx \n", count, bufsiz);
1da177e4
LT		 383 return -E2BIG;
384 }
385
d081d470 386 mutex_lock(&chip->tpm_mutex);
1da177e4 387
90dda520 388 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
e659a3fe 389 dev_err(chip->dev,
d9e5b6bf
KH		 390 "tpm_transmit: tpm_send: error %zd\n", rc);
391 goto out;
1da177e4
LT		 392 }
393
27084efe
LD		 394 if (chip->vendor.irq)
395 goto out_recv;
396
9e18ee19 397 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
1da177e4 398 do {
90dda520
KJH		 399 u8 status = chip->vendor.status(chip);
400 if ((status & chip->vendor.req_complete_mask) ==
401 chip->vendor.req_complete_val)
1da177e4 402 goto out_recv;
d9e5b6bf 403
90dda520 404 if ((status == chip->vendor.req_canceled)) {
e659a3fe 405 dev_err(chip->dev, "Operation Canceled\n");
d9e5b6bf
KH		 406 rc = -ECANCELED;
407 goto out;
408 }
409
410 msleep(TPM_TIMEOUT); /* CHECK */
1da177e4 411 rmb();
700d8bdc 412 } while (time_before(jiffies, stop));
1da177e4 413
90dda520 414 chip->vendor.cancel(chip);
e659a3fe 415 dev_err(chip->dev, "Operation Timed out\n");
d9e5b6bf
KH		 416 rc = -ETIME;
417 goto out;
1da177e4
LT		 418
419out_recv:
90dda520 420 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
d9e5b6bf 421 if (rc < 0)
e659a3fe 422 dev_err(chip->dev,
d9e5b6bf
KH		 423 "tpm_transmit: tpm_recv: error %zd\n", rc);
424out:
d081d470 425 mutex_unlock(&chip->tpm_mutex);
d9e5b6bf 426 return rc;
1da177e4
LT		 427}
428
429#define TPM_DIGEST_SIZE 20
beed53a1
KJH		 430#define TPM_ERROR_SIZE 10
431#define TPM_RET_CODE_IDX 6
432#define TPM_GET_CAP_RET_SIZE_IDX 10
433#define TPM_GET_CAP_RET_UINT32_1_IDX 14
434#define TPM_GET_CAP_RET_UINT32_2_IDX 18
435#define TPM_GET_CAP_RET_UINT32_3_IDX 22
436#define TPM_GET_CAP_RET_UINT32_4_IDX 26
08e96e48
KJH		 437#define TPM_GET_CAP_PERM_DISABLE_IDX 16
438#define TPM_GET_CAP_PERM_INACTIVE_IDX 18
439#define TPM_GET_CAP_RET_BOOL_1_IDX 14
440#define TPM_GET_CAP_TEMP_INACTIVE_IDX 16
beed53a1
KJH		 441
442#define TPM_CAP_IDX 13
443#define TPM_CAP_SUBCAP_IDX 21
444
445enum tpm_capabilities {
08e96e48 446 TPM_CAP_FLAG = 4,
beed53a1
KJH		 447 TPM_CAP_PROP = 5,
448};
449
450enum tpm_sub_capabilities {
451 TPM_CAP_PROP_PCR = 0x1,
452 TPM_CAP_PROP_MANUFACTURER = 0x3,
08e96e48
KJH		 453 TPM_CAP_FLAG_PERM = 0x8,
454 TPM_CAP_FLAG_VOL = 0x9,
455 TPM_CAP_PROP_OWNER = 0x11,
456 TPM_CAP_PROP_TIS_TIMEOUT = 0x15,
457 TPM_CAP_PROP_TIS_DURATION = 0x20,
beed53a1
KJH		 458};
459
460/*
461 * This is a semi generic GetCapability command for use
462 * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG
463 * and their associated sub_capabilities.
464 */
465
466static const u8 tpm_cap[] = {
1da177e4
LT		 467 0, 193, /* TPM_TAG_RQU_COMMAND */
468 0, 0, 0, 22, /* length */
469 0, 0, 0, 101, /* TPM_ORD_GetCapability */
beed53a1
KJH		 470 0, 0, 0, 0, /* TPM_CAP_<TYPE> */
471 0, 0, 0, 4, /* TPM_CAP_SUB_<TYPE> size */
472 0, 0, 1, 0 /* TPM_CAP_SUB_<TYPE> */
1da177e4
LT		 473};
474
beed53a1
KJH		 475static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len,
476 char *desc)
477{
478 int err;
479
480 len = tpm_transmit(chip, data, len);
481 if (len < 0)
482 return len;
483 if (len == TPM_ERROR_SIZE) {
484 err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)));
485 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
486 return err;
487 }
488 return 0;
489}
490
08e96e48
KJH		 491void tpm_gen_interrupt(struct tpm_chip *chip)
492{
493 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
494 ssize_t rc;
495
496 memcpy(data, tpm_cap, sizeof(tpm_cap));
497 data[TPM_CAP_IDX] = TPM_CAP_PROP;
498 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
499
500 rc = transmit_cmd(chip, data, sizeof(data),
501 "attempting to determine the timeouts");
502}
503EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
504
505void tpm_get_timeouts(struct tpm_chip *chip)
506{
507 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
508 ssize_t rc;
509 u32 timeout;
510
511 memcpy(data, tpm_cap, sizeof(tpm_cap));
512 data[TPM_CAP_IDX] = TPM_CAP_PROP;
513 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
514
515 rc = transmit_cmd(chip, data, sizeof(data),
516 "attempting to determine the timeouts");
517 if (rc)
518 goto duration;
519
520 if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
521 != 4 * sizeof(u32))
522 goto duration;
523
524 /* Don't overwrite default if value is 0 */
525 timeout =
526 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)));
527 if (timeout)
36b20020 528 chip->vendor.timeout_a = msecs_to_jiffies(timeout);
08e96e48
KJH		 529 timeout =
530 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)));
531 if (timeout)
36b20020 532 chip->vendor.timeout_b = msecs_to_jiffies(timeout);
08e96e48
KJH		 533 timeout =
534 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)));
535 if (timeout)
36b20020 536 chip->vendor.timeout_c = msecs_to_jiffies(timeout);
08e96e48
KJH		 537 timeout =
538 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX)));
539 if (timeout)
36b20020 540 chip->vendor.timeout_d = msecs_to_jiffies(timeout);
08e96e48
KJH		 541
542duration:
543 memcpy(data, tpm_cap, sizeof(tpm_cap));
544 data[TPM_CAP_IDX] = TPM_CAP_PROP;
545 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_DURATION;
546
547 rc = transmit_cmd(chip, data, sizeof(data),
548 "attempting to determine the durations");
549 if (rc)
550 return;
551
552 if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
553 != 3 * sizeof(u32))
554 return;
555
556 chip->vendor.duration[TPM_SHORT] =
36b20020
KJH		 557 msecs_to_jiffies(be32_to_cpu
558 (*((__be32 *) (data +
559 TPM_GET_CAP_RET_UINT32_1_IDX))));
08e96e48 560 chip->vendor.duration[TPM_MEDIUM] =
36b20020
KJH		 561 msecs_to_jiffies(be32_to_cpu
562 (*((__be32 *) (data +
563 TPM_GET_CAP_RET_UINT32_2_IDX))));
08e96e48 564 chip->vendor.duration[TPM_LONG] =
36b20020
KJH		 565 msecs_to_jiffies(be32_to_cpu
566 (*((__be32 *) (data +
567 TPM_GET_CAP_RET_UINT32_3_IDX))));
08e96e48
KJH		 568}
569EXPORT_SYMBOL_GPL(tpm_get_timeouts);
570
571void tpm_continue_selftest(struct tpm_chip *chip)
572{
573 u8 data[] = {
574 0, 193, /* TPM_TAG_RQU_COMMAND */
575 0, 0, 0, 10, /* length */
576 0, 0, 0, 83, /* TPM_ORD_GetCapability */
577 };
578
579 tpm_transmit(chip, data, sizeof(data));
580}
581EXPORT_SYMBOL_GPL(tpm_continue_selftest);
582
ec288bd3
MO		 583#define TPM_INTERNAL_RESULT_SIZE 200
584
08e96e48
KJH		 585ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
586 char *buf)
587{
ec288bd3 588 u8 *data;
08e96e48
KJH		 589 ssize_t rc;
590
591 struct tpm_chip *chip = dev_get_drvdata(dev);
592 if (chip == NULL)
593 return -ENODEV;
594
ec288bd3
MO		 595 data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
596 if (!data)
597 return -ENOMEM;
598
08e96e48
KJH		 599 memcpy(data, tpm_cap, sizeof(tpm_cap));
600 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
601 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
602
ec288bd3
MO		 603 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
604 "attemtping to determine the permanent enabled state");
605 if (rc) {
606 kfree(data);
08e96e48 607 return 0;
ec288bd3
MO		 608 }
609
610 rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]);
611
612 kfree(data);
613 return rc;
08e96e48
KJH		 614}
615EXPORT_SYMBOL_GPL(tpm_show_enabled);
616
617ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
618 char *buf)
619{
ec288bd3 620 u8 *data;
08e96e48
KJH		 621 ssize_t rc;
622
623 struct tpm_chip *chip = dev_get_drvdata(dev);
624 if (chip == NULL)
625 return -ENODEV;
626
ec288bd3
MO		 627 data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
628 if (!data)
629 return -ENOMEM;
630
08e96e48
KJH		 631 memcpy(data, tpm_cap, sizeof(tpm_cap));
632 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
633 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
634
ec288bd3
MO		 635 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
636 "attemtping to determine the permanent active state");
637 if (rc) {
638 kfree(data);
08e96e48 639 return 0;
ec288bd3
MO		 640 }
641
642 rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]);
643
644 kfree(data);
645 return rc;
08e96e48
KJH		 646}
647EXPORT_SYMBOL_GPL(tpm_show_active);
648
649ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
650 char *buf)
651{
ec288bd3 652 u8 *data;
08e96e48
KJH		 653 ssize_t rc;
654
655 struct tpm_chip *chip = dev_get_drvdata(dev);
656 if (chip == NULL)
657 return -ENODEV;
658
ec288bd3
MO		 659 data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
660 if (!data)
661 return -ENOMEM;
662
08e96e48
KJH		 663 memcpy(data, tpm_cap, sizeof(tpm_cap));
664 data[TPM_CAP_IDX] = TPM_CAP_PROP;
665 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER;
666
ec288bd3 667 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
08e96e48 668 "attempting to determine the owner state");
ec288bd3
MO		 669 if (rc) {
670 kfree(data);
08e96e48 671 return 0;
ec288bd3
MO		 672 }
673
674 rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]);
675
676 kfree(data);
677 return rc;
08e96e48
KJH		 678}
679EXPORT_SYMBOL_GPL(tpm_show_owned);
680
681ssize_t tpm_show_temp_deactivated(struct device * dev,
682 struct device_attribute * attr, char *buf)
683{
ec288bd3 684 u8 *data;
08e96e48
KJH		 685 ssize_t rc;
686
687 struct tpm_chip *chip = dev_get_drvdata(dev);
688 if (chip == NULL)
689 return -ENODEV;
690
ec288bd3
MO		 691 data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
692 if (!data)
693 return -ENOMEM;
694
08e96e48
KJH		 695 memcpy(data, tpm_cap, sizeof(tpm_cap));
696 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
697 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL;
698
ec288bd3 699 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
08e96e48 700 "attempting to determine the temporary state");
ec288bd3
MO		 701 if (rc) {
702 kfree(data);
08e96e48 703 return 0;
ec288bd3
MO		 704 }
705
706 rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]);
707
708 kfree(data);
709 return rc;
08e96e48
KJH		 710}
711EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
712
dff37e4b 713static const u8 pcrread[] = {
1da177e4
LT		 714 0, 193, /* TPM_TAG_RQU_COMMAND */
715 0, 0, 0, 14, /* length */
716 0, 0, 0, 21, /* TPM_ORD_PcrRead */
717 0, 0, 0, 0 /* PCR index */
718};
719
6659ca2a
KH		 720ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
721 char *buf)
1da177e4 722{
ec288bd3 723 u8 *data;
beed53a1 724 ssize_t rc;
81179bb6
KH		 725 int i, j, num_pcrs;
726 __be32 index;
1da177e4
LT		 727 char *str = buf;
728
e659a3fe 729 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 730 if (chip == NULL)
731 return -ENODEV;
732
ec288bd3
MO		 733 data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
734 if (!data)
735 return -ENOMEM;
736
beed53a1
KJH		 737 memcpy(data, tpm_cap, sizeof(tpm_cap));
738 data[TPM_CAP_IDX] = TPM_CAP_PROP;
739 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR;
740
ec288bd3 741 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
beed53a1 742 "attempting to determine the number of PCRS");
ec288bd3
MO		 743 if (rc) {
744 kfree(data);
e234bc97 745 return 0;
ec288bd3 746 }
1da177e4 747
81179bb6 748 num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));
1da177e4
LT		 749 for (i = 0; i < num_pcrs; i++) {
750 memcpy(data, pcrread, sizeof(pcrread));
751 index = cpu_to_be32(i);
752 memcpy(data + 10, &index, 4);
ec288bd3 753 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
beed53a1
KJH		 754 "attempting to read a PCR");
755 if (rc)
e234bc97 756 goto out;
1da177e4
LT		 757 str += sprintf(str, "PCR-%02d: ", i);
758 for (j = 0; j < TPM_DIGEST_SIZE; j++)
759 str += sprintf(str, "%02X ", *(data + 10 + j));
760 str += sprintf(str, "\n");
761 }
e234bc97 762out:
ec288bd3 763 kfree(data);
1da177e4
LT		 764 return str - buf;
765}
6659ca2a 766EXPORT_SYMBOL_GPL(tpm_show_pcrs);
1da177e4
LT		 767
768#define READ_PUBEK_RESULT_SIZE 314
dff37e4b 769static const u8 readpubek[] = {
1da177e4
LT		 770 0, 193, /* TPM_TAG_RQU_COMMAND */
771 0, 0, 0, 30, /* length */
772 0, 0, 0, 124, /* TPM_ORD_ReadPubek */
773};
774
6659ca2a
KH		 775ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
776 char *buf)
1da177e4 777{
2df7111f 778 u8 *data;
beed53a1 779 ssize_t err;
81179bb6 780 int i, rc;
1da177e4
LT		 781 char *str = buf;
782
e659a3fe 783 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 784 if (chip == NULL)
785 return -ENODEV;
786
b888c87b 787 data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);
2df7111f
KH		 788 if (!data)
789 return -ENOMEM;
790
1da177e4 791 memcpy(data, readpubek, sizeof(readpubek));
1da177e4 792
beed53a1
KJH		 793 err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE,
794 "attempting to read the PUBEK");
795 if (err)
34d6e075 796 goto out;
1da177e4
LT		 797
798 /*
799 ignore header 10 bytes
800 algorithm 32 bits (1 == RSA )
801 encscheme 16 bits
802 sigscheme 16 bits
803 parameters (RSA 12->bytes: keybit, #primes, expbit)
804 keylenbytes 32 bits
805 256 byte modulus
806 ignore checksum 20 bytes
807 */
808
1da177e4
LT		 809 str +=
810 sprintf(str,
811 "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
812 "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
813 " %02X %02X %02X %02X %02X %02X %02X %02X\n"
814 "Modulus length: %d\nModulus: \n",
815 data[10], data[11], data[12], data[13], data[14],
816 data[15], data[16], data[17], data[22], data[23],
817 data[24], data[25], data[26], data[27], data[28],
818 data[29], data[30], data[31], data[32], data[33],
1dda8abe 819 be32_to_cpu(*((__be32 *) (data + 34))));
1da177e4
LT		 820
821 for (i = 0; i < 256; i++) {
1dda8abe 822 str += sprintf(str, "%02X ", data[i + 38]);
1da177e4
LT		 823 if ((i + 1) % 16 == 0)
824 str += sprintf(str, "\n");
825 }
34d6e075 826out:
beed53a1 827 rc = str - buf;
2df7111f
KH		 828 kfree(data);
829 return rc;
1da177e4 830}
6659ca2a 831EXPORT_SYMBOL_GPL(tpm_show_pubek);
1da177e4 832
beed53a1 833#define CAP_VERSION_1_1 6
08e96e48 834#define CAP_VERSION_1_2 0x1A
beed53a1 835#define CAP_VERSION_IDX 13
dff37e4b 836static const u8 cap_version[] = {
1da177e4
LT		 837 0, 193, /* TPM_TAG_RQU_COMMAND */
838 0, 0, 0, 18, /* length */
839 0, 0, 0, 101, /* TPM_ORD_GetCapability */
beed53a1 840 0, 0, 0, 0,
1da177e4
LT		 841 0, 0, 0, 0
842};
843
6659ca2a
KH		 844ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
845 char *buf)
1da177e4 846{
ec288bd3 847 u8 *data;
beed53a1 848 ssize_t rc;
1da177e4
LT		 849 char *str = buf;
850
e659a3fe 851 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 852 if (chip == NULL)
853 return -ENODEV;
854
ec288bd3
MO		 855 data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
856 if (!data)
857 return -ENOMEM;
858
beed53a1
KJH		 859 memcpy(data, tpm_cap, sizeof(tpm_cap));
860 data[TPM_CAP_IDX] = TPM_CAP_PROP;
861 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
1da177e4 862
ec288bd3 863 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
beed53a1 864 "attempting to determine the manufacturer");
ec288bd3
MO		 865 if (rc) {
866 kfree(data);
beed53a1 867 return 0;
ec288bd3 868 }
1da177e4
LT		 869
870 str += sprintf(str, "Manufacturer: 0x%x\n",
beed53a1 871 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
1da177e4
LT		 872
873 memcpy(data, cap_version, sizeof(cap_version));
beed53a1 874 data[CAP_VERSION_IDX] = CAP_VERSION_1_1;
ec288bd3 875 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
beed53a1
KJH		 876 "attempting to determine the 1.1 version");
877 if (rc)
878 goto out;
1da177e4 879
beed53a1
KJH		 880 str += sprintf(str,
881 "TCG version: %d.%d\nFirmware version: %d.%d\n",
882 (int) data[14], (int) data[15], (int) data[16],
883 (int) data[17]);
1da177e4 884
beed53a1 885out:
ec288bd3 886 kfree(data);
1da177e4
LT		 887 return str - buf;
888}
6659ca2a
KH		 889EXPORT_SYMBOL_GPL(tpm_show_caps);
890
08e96e48
KJH		 891ssize_t tpm_show_caps_1_2(struct device * dev,
892 struct device_attribute * attr, char *buf)
893{
ec288bd3 894 u8 *data;
08e96e48
KJH		 895 ssize_t len;
896 char *str = buf;
897
898 struct tpm_chip *chip = dev_get_drvdata(dev);
899 if (chip == NULL)
900 return -ENODEV;
901
ec288bd3
MO		 902 data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
903 if (!data)
904 return -ENOMEM;
905
08e96e48
KJH		 906 memcpy(data, tpm_cap, sizeof(tpm_cap));
907 data[TPM_CAP_IDX] = TPM_CAP_PROP;
908 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
909
ec288bd3
MO		 910 len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE);
911 if (len <= TPM_ERROR_SIZE) {
08e96e48
KJH		 912 dev_dbg(chip->dev, "A TPM error (%d) occurred "
913 "attempting to determine the manufacturer\n",
914 be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
ec288bd3 915 kfree(data);
08e96e48
KJH		 916 return 0;
917 }
918
919 str += sprintf(str, "Manufacturer: 0x%x\n",
920 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
921
922 memcpy(data, cap_version, sizeof(cap_version));
923 data[CAP_VERSION_IDX] = CAP_VERSION_1_2;
924
ec288bd3
MO		 925 len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE);
926 if (len <= TPM_ERROR_SIZE) {
08e96e48
KJH		 927 dev_err(chip->dev, "A TPM error (%d) occurred "
928 "attempting to determine the 1.2 version\n",
929 be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
930 goto out;
931 }
932 str += sprintf(str,
933 "TCG version: %d.%d\nFirmware version: %d.%d\n",
934 (int) data[16], (int) data[17], (int) data[18],
935 (int) data[19]);
936
937out:
ec288bd3 938 kfree(data);
08e96e48
KJH		 939 return str - buf;
940}
941EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
942
6659ca2a
KH		 943ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
944 const char *buf, size_t count)
945{
946 struct tpm_chip *chip = dev_get_drvdata(dev);
947 if (chip == NULL)
948 return 0;
949
90dda520 950 chip->vendor.cancel(chip);
6659ca2a
KH		 951 return count;
952}
953EXPORT_SYMBOL_GPL(tpm_store_cancel);
1da177e4 954
1da177e4
LT		 955/*
956 * Device file system interface to the TPM
957 */
958int tpm_open(struct inode *inode, struct file *file)
959{
960 int rc = 0, minor = iminor(inode);
961 struct tpm_chip *chip = NULL, *pos;
962
25368ca5 963 lock_kernel();
1da177e4
LT		 964 spin_lock(&driver_lock);
965
966 list_for_each_entry(pos, &tpm_chip_list, list) {
90dda520 967 if (pos->vendor.miscdev.minor == minor) {
1da177e4
LT		 968 chip = pos;
969 break;
970 }
971 }
972
973 if (chip == NULL) {
974 rc = -ENODEV;
975 goto err_out;
976 }
977
978 if (chip->num_opens) {
b888c87b 979 dev_dbg(chip->dev, "Another process owns this TPM\n");
1da177e4
LT		 980 rc = -EBUSY;
981 goto err_out;
982 }
983
984 chip->num_opens++;
e659a3fe 985 get_device(chip->dev);
1da177e4
LT		 986
987 spin_unlock(&driver_lock);
988
989 chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
990 if (chip->data_buffer == NULL) {
991 chip->num_opens--;
e659a3fe 992 put_device(chip->dev);
25368ca5 993 unlock_kernel();
1da177e4
LT		 994 return -ENOMEM;
995 }
996
997 atomic_set(&chip->data_pending, 0);
998
999 file->private_data = chip;
25368ca5 1000 unlock_kernel();
1da177e4
LT		 1001 return 0;
1002
1003err_out:
1004 spin_unlock(&driver_lock);
25368ca5 1005 unlock_kernel();
1da177e4
LT		 1006 return rc;
1007}
1da177e4
LT		 1008EXPORT_SYMBOL_GPL(tpm_open);
1009
1010int tpm_release(struct inode *inode, struct file *file)
1011{
1012 struct tpm_chip *chip = file->private_data;
1da177e4 1013
8e39c933 1014 flush_scheduled_work();
1da177e4 1015 spin_lock(&driver_lock);
5e976d55 1016 file->private_data = NULL;
fe3fd483 1017 del_singleshot_timer_sync(&chip->user_read_timer);
1da177e4 1018 atomic_set(&chip->data_pending, 0);
8e39c933 1019 chip->num_opens--;
e659a3fe 1020 put_device(chip->dev);
5e976d55
KH		 1021 kfree(chip->data_buffer);
1022 spin_unlock(&driver_lock);
1da177e4
LT		 1023 return 0;
1024}
1da177e4
LT		 1025EXPORT_SYMBOL_GPL(tpm_release);
1026
b888c87b 1027ssize_t tpm_write(struct file *file, const char __user *buf,
3c2f606a 1028 size_t size, loff_t *off)
1da177e4
LT		 1029{
1030 struct tpm_chip *chip = file->private_data;
01476001 1031 size_t in_size = size, out_size;
1da177e4
LT		 1032
1033 /* cannot perform a write until the read has cleared
1034 either via tpm_read or a user_read_timer timeout */
700d8bdc
NA		 1035 while (atomic_read(&chip->data_pending) != 0)
1036 msleep(TPM_TIMEOUT);
1da177e4 1037
d081d470 1038 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 1039
1040 if (in_size > TPM_BUFSIZE)
1041 in_size = TPM_BUFSIZE;
1042
1043 if (copy_from_user
1044 (chip->data_buffer, (void __user *) buf, in_size)) {
d081d470 1045 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1046 return -EFAULT;
1047 }
1048
1049 /* atomic tpm command send and result receive */
1050 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1051
1052 atomic_set(&chip->data_pending, out_size);
d081d470 1053 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1054
1055 /* Set a timeout by which the reader must come claim the result */
fe3fd483 1056 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1da177e4
LT		 1057
1058 return in_size;
1059}
1da177e4
LT		 1060EXPORT_SYMBOL_GPL(tpm_write);
1061
3c2f606a
KJH		 1062ssize_t tpm_read(struct file *file, char __user *buf,
1063 size_t size, loff_t *off)
1da177e4
LT		 1064{
1065 struct tpm_chip *chip = file->private_data;
01476001 1066 ssize_t ret_size;
1da177e4 1067
5b44bd58 1068 del_singleshot_timer_sync(&chip->user_read_timer);
ba396115 1069 flush_scheduled_work();
5b44bd58
KH		 1070 ret_size = atomic_read(&chip->data_pending);
1071 atomic_set(&chip->data_pending, 0);
1072 if (ret_size > 0) { /* relay data */
1073 if (size < ret_size)
1074 ret_size = size;
1da177e4 1075
d081d470 1076 mutex_lock(&chip->buffer_mutex);
f6a2382c 1077 if (copy_to_user(buf, chip->data_buffer, ret_size))
5b44bd58 1078 ret_size = -EFAULT;
d081d470 1079 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1080 }
1081
1082 return ret_size;
1083}
1da177e4
LT		 1084EXPORT_SYMBOL_GPL(tpm_read);
1085
e659a3fe 1086void tpm_remove_hardware(struct device *dev)
1da177e4 1087{
e659a3fe 1088 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1089
1090 if (chip == NULL) {
e659a3fe 1091 dev_err(dev, "No device data found\n");
1da177e4
LT		 1092 return;
1093 }
1094
1095 spin_lock(&driver_lock);
1096
1097 list_del(&chip->list);
1098
1099 spin_unlock(&driver_lock);
1100
90dda520 1101 misc_deregister(&chip->vendor.miscdev);
1da177e4 1102
90dda520 1103 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
55a82ab3 1104 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1105
5bd91f18
RM		 1106 /* write it this way to be explicit (chip->dev == dev) */
1107 put_device(chip->dev);
1da177e4 1108}
e659a3fe 1109EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4 1110
1da177e4
LT		 1111/*
1112 * We are about to suspend. Save the TPM state
1113 * so that it can be restored.
1114 */
ce2c87d4 1115int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1da177e4 1116{
ce2c87d4 1117 struct tpm_chip *chip = dev_get_drvdata(dev);
2490c681
DS		 1118 u8 savestate[] = {
1119 0, 193, /* TPM_TAG_RQU_COMMAND */
1120 0, 0, 0, 10, /* blob length (in bytes) */
1121 0, 0, 0, 152 /* TPM_ORD_SaveState */
1122 };
1123
1da177e4
LT		 1124 if (chip == NULL)
1125 return -ENODEV;
1126
1127 tpm_transmit(chip, savestate, sizeof(savestate));
1128 return 0;
1129}
1da177e4
LT		 1130EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1131
1132/*
1133 * Resume from a power safe. The BIOS already restored
1134 * the TPM state.
1135 */
ce2c87d4 1136int tpm_pm_resume(struct device *dev)
1da177e4 1137{
ce2c87d4 1138 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1139
1140 if (chip == NULL)
1141 return -ENODEV;
1142
1da177e4
LT		 1143 return 0;
1144}
1da177e4
LT		 1145EXPORT_SYMBOL_GPL(tpm_pm_resume);
1146
5bd91f18
RM		 1147/*
1148 * Once all references to platform device are down to 0,
1149 * release all allocated structures.
1150 * In case vendor provided release function,
1151 * call it too.
1152 */
1153static void tpm_dev_release(struct device *dev)
1154{
1155 struct tpm_chip *chip = dev_get_drvdata(dev);
1156
1157 if (chip->vendor.release)
1158 chip->vendor.release(dev);
1159
1160 chip->release(dev);
1161
1162 clear_bit(chip->dev_num, dev_mask);
1163 kfree(chip->vendor.miscdev.name);
1164 kfree(chip);
1165}
1166
1da177e4
LT		 1167/*
1168 * Called from tpm_<specific>.c probe function only for devices
1169 * the driver has determined it should claim. Prior to calling
1170 * this function the specific probe function has called pci_enable_device
1171 * upon errant exit from this function specific probe function should call
1172 * pci_disable_device
1173 */
e0dd03ca
KJH		 1174struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vendor_specific
1175 *entry)
1da177e4 1176{
6f9beccb
KJH		 1177#define DEVNAME_SIZE 7
1178
1179 char *devname;
1da177e4 1180 struct tpm_chip *chip;
1da177e4
LT		 1181
1182 /* Driver specific per-device data */
b888c87b 1183 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
8e39c933
PW		 1184 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1185
1186 if (chip == NULL || devname == NULL) {
1187 kfree(chip);
1188 kfree(devname);
e0dd03ca 1189 return NULL;
8e39c933 1190 }
1da177e4 1191
d081d470
MK		 1192 mutex_init(&chip->buffer_mutex);
1193 mutex_init(&chip->tpm_mutex);
1da177e4
LT		 1194 INIT_LIST_HEAD(&chip->list);
1195
c4028958 1196 INIT_WORK(&chip->work, timeout_work);
09e12f9f 1197
40565f19
JS		 1198 setup_timer(&chip->user_read_timer, user_reader_timeout,
1199 (unsigned long)chip);
fe3fd483 1200
90dda520 1201 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4 1202
10685a95 1203 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1da177e4 1204
10685a95 1205 if (chip->dev_num >= TPM_NUM_DEVICES) {
b888c87b 1206 dev_err(dev, "No available tpm device numbers\n");
1da177e4 1207 kfree(chip);
e0dd03ca 1208 return NULL;
1da177e4 1209 } else if (chip->dev_num == 0)
90dda520 1210 chip->vendor.miscdev.minor = TPM_MINOR;
1da177e4 1211 else
90dda520 1212 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1da177e4 1213
10685a95
KJH		 1214 set_bit(chip->dev_num, dev_mask);
1215
6f9beccb 1216 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
90dda520 1217 chip->vendor.miscdev.name = devname;
1da177e4 1218
94fbcded 1219 chip->vendor.miscdev.parent = dev;
e659a3fe 1220 chip->dev = get_device(dev);
5bd91f18
RM		 1221 chip->release = dev->release;
1222 dev->release = tpm_dev_release;
1223 dev_set_drvdata(dev, chip);
1da177e4 1224
90dda520 1225 if (misc_register(&chip->vendor.miscdev)) {
e659a3fe 1226 dev_err(chip->dev,
1da177e4 1227 "unable to misc_register %s, minor %d\n",
90dda520
KJH		 1228 chip->vendor.miscdev.name,
1229 chip->vendor.miscdev.minor);
5bd91f18 1230 put_device(chip->dev);
e0dd03ca 1231 return NULL;
1da177e4
LT		 1232 }
1233
5e976d55
KH		 1234 spin_lock(&driver_lock);
1235
1da177e4
LT		 1236 list_add(&chip->list, &tpm_chip_list);
1237
5e976d55
KH		 1238 spin_unlock(&driver_lock);
1239
f33d9bd5
JG		 1240 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1241 list_del(&chip->list);
5d469ec0 1242 misc_deregister(&chip->vendor.miscdev);
5bd91f18 1243 put_device(chip->dev);
f33d9bd5
JG		 1244 return NULL;
1245 }
1da177e4 1246
55a82ab3
KJH		 1247 chip->bios_dir = tpm_bios_log_setup(devname);
1248
e0dd03ca 1249 return chip;
1da177e4 1250}
1da177e4
LT		 1251EXPORT_SYMBOL_GPL(tpm_register_hardware);
1252
1da177e4
LT		 1253MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1254MODULE_DESCRIPTION("TPM Driver");
1255MODULE_VERSION("2.0");
1256MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)