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Merge branch 'akpm'
[linux-2.6/next.git] / drivers / char / tpm / tpm.c
blobe53af7638186840d449a65de533667dbb164316c
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
22 * calls to msleep.
23 *
24 */
25
26 #include <linux/poll.h>
27 #include <linux/slab.h>
28 #include <linux/mutex.h>
29 #include <linux/spinlock.h>
30
31 #include "tpm.h"
32
33 enum tpm_const {
34 TPM_MINOR = 224, /* officially assigned */
35 TPM_BUFSIZE = 4096,
36 TPM_NUM_DEVICES = 256,
37 };
38
39 enum 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
50 /*
51 * Bug workaround - some TPM's don't flush the most
52 * recently changed pcr on suspend, so force the flush
53 * with an extend to the selected _unused_ non-volatile pcr.
54 */
55 static int tpm_suspend_pcr;
56 module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
57 MODULE_PARM_DESC(suspend_pcr,
58 "PCR to use for dummy writes to faciltate flush on suspend.");
59
60 static LIST_HEAD(tpm_chip_list);
61 static DEFINE_SPINLOCK(driver_lock);
62 static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
63
64 /*
65 * Array with one entry per ordinal defining the maximum amount
66 * of time the chip could take to return the result. The ordinal
67 * designation of short, medium or long is defined in a table in
68 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
69 * values of the SHORT, MEDIUM, and LONG durations are retrieved
70 * from the chip during initialization with a call to tpm_get_timeouts.
71 */
72 static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
73 TPM_UNDEFINED, /* 0 */
74 TPM_UNDEFINED,
75 TPM_UNDEFINED,
76 TPM_UNDEFINED,
77 TPM_UNDEFINED,
78 TPM_UNDEFINED, /* 5 */
79 TPM_UNDEFINED,
80 TPM_UNDEFINED,
81 TPM_UNDEFINED,
82 TPM_UNDEFINED,
83 TPM_SHORT, /* 10 */
84 TPM_SHORT,
85 };
86
87 static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
88 TPM_UNDEFINED, /* 0 */
89 TPM_UNDEFINED,
90 TPM_UNDEFINED,
91 TPM_UNDEFINED,
92 TPM_UNDEFINED,
93 TPM_UNDEFINED, /* 5 */
94 TPM_UNDEFINED,
95 TPM_UNDEFINED,
96 TPM_UNDEFINED,
97 TPM_UNDEFINED,
98 TPM_SHORT, /* 10 */
99 TPM_SHORT,
100 TPM_MEDIUM,
101 TPM_LONG,
102 TPM_LONG,
103 TPM_MEDIUM, /* 15 */
104 TPM_SHORT,
105 TPM_SHORT,
106 TPM_MEDIUM,
107 TPM_LONG,
108 TPM_SHORT, /* 20 */
109 TPM_SHORT,
110 TPM_MEDIUM,
111 TPM_MEDIUM,
112 TPM_MEDIUM,
113 TPM_SHORT, /* 25 */
114 TPM_SHORT,
115 TPM_MEDIUM,
116 TPM_SHORT,
117 TPM_SHORT,
118 TPM_MEDIUM, /* 30 */
119 TPM_LONG,
120 TPM_MEDIUM,
121 TPM_SHORT,
122 TPM_SHORT,
123 TPM_SHORT, /* 35 */
124 TPM_MEDIUM,
125 TPM_MEDIUM,
126 TPM_UNDEFINED,
127 TPM_UNDEFINED,
128 TPM_MEDIUM, /* 40 */
129 TPM_LONG,
130 TPM_MEDIUM,
131 TPM_SHORT,
132 TPM_SHORT,
133 TPM_SHORT, /* 45 */
134 TPM_SHORT,
135 TPM_SHORT,
136 TPM_SHORT,
137 TPM_LONG,
138 TPM_MEDIUM, /* 50 */
139 TPM_MEDIUM,
140 TPM_UNDEFINED,
141 TPM_UNDEFINED,
142 TPM_UNDEFINED,
143 TPM_UNDEFINED, /* 55 */
144 TPM_UNDEFINED,
145 TPM_UNDEFINED,
146 TPM_UNDEFINED,
147 TPM_UNDEFINED,
148 TPM_MEDIUM, /* 60 */
149 TPM_MEDIUM,
150 TPM_MEDIUM,
151 TPM_SHORT,
152 TPM_SHORT,
153 TPM_MEDIUM, /* 65 */
154 TPM_UNDEFINED,
155 TPM_UNDEFINED,
156 TPM_UNDEFINED,
157 TPM_UNDEFINED,
158 TPM_SHORT, /* 70 */
159 TPM_SHORT,
160 TPM_UNDEFINED,
161 TPM_UNDEFINED,
162 TPM_UNDEFINED,
163 TPM_UNDEFINED, /* 75 */
164 TPM_UNDEFINED,
165 TPM_UNDEFINED,
166 TPM_UNDEFINED,
167 TPM_UNDEFINED,
168 TPM_LONG, /* 80 */
169 TPM_UNDEFINED,
170 TPM_MEDIUM,
171 TPM_LONG,
172 TPM_SHORT,
173 TPM_UNDEFINED, /* 85 */
174 TPM_UNDEFINED,
175 TPM_UNDEFINED,
176 TPM_UNDEFINED,
177 TPM_UNDEFINED,
178 TPM_SHORT, /* 90 */
179 TPM_SHORT,
180 TPM_SHORT,
181 TPM_SHORT,
182 TPM_SHORT,
183 TPM_UNDEFINED, /* 95 */
184 TPM_UNDEFINED,
185 TPM_UNDEFINED,
186 TPM_UNDEFINED,
187 TPM_UNDEFINED,
188 TPM_MEDIUM, /* 100 */
189 TPM_SHORT,
190 TPM_SHORT,
191 TPM_UNDEFINED,
192 TPM_UNDEFINED,
193 TPM_UNDEFINED, /* 105 */
194 TPM_UNDEFINED,
195 TPM_UNDEFINED,
196 TPM_UNDEFINED,
197 TPM_UNDEFINED,
198 TPM_SHORT, /* 110 */
199 TPM_SHORT,
200 TPM_SHORT,
201 TPM_SHORT,
202 TPM_SHORT,
203 TPM_SHORT, /* 115 */
204 TPM_SHORT,
205 TPM_SHORT,
206 TPM_UNDEFINED,
207 TPM_UNDEFINED,
208 TPM_LONG, /* 120 */
209 TPM_LONG,
210 TPM_MEDIUM,
211 TPM_UNDEFINED,
212 TPM_SHORT,
213 TPM_SHORT, /* 125 */
214 TPM_SHORT,
215 TPM_LONG,
216 TPM_SHORT,
217 TPM_SHORT,
218 TPM_SHORT, /* 130 */
219 TPM_MEDIUM,
220 TPM_UNDEFINED,
221 TPM_SHORT,
222 TPM_MEDIUM,
223 TPM_UNDEFINED, /* 135 */
224 TPM_UNDEFINED,
225 TPM_UNDEFINED,
226 TPM_UNDEFINED,
227 TPM_UNDEFINED,
228 TPM_SHORT, /* 140 */
229 TPM_SHORT,
230 TPM_UNDEFINED,
231 TPM_UNDEFINED,
232 TPM_UNDEFINED,
233 TPM_UNDEFINED, /* 145 */
234 TPM_UNDEFINED,
235 TPM_UNDEFINED,
236 TPM_UNDEFINED,
237 TPM_UNDEFINED,
238 TPM_SHORT, /* 150 */
239 TPM_MEDIUM,
240 TPM_MEDIUM,
241 TPM_SHORT,
242 TPM_SHORT,
243 TPM_UNDEFINED, /* 155 */
244 TPM_UNDEFINED,
245 TPM_UNDEFINED,
246 TPM_UNDEFINED,
247 TPM_UNDEFINED,
248 TPM_SHORT, /* 160 */
249 TPM_SHORT,
250 TPM_SHORT,
251 TPM_SHORT,
252 TPM_UNDEFINED,
253 TPM_UNDEFINED, /* 165 */
254 TPM_UNDEFINED,
255 TPM_UNDEFINED,
256 TPM_UNDEFINED,
257 TPM_UNDEFINED,
258 TPM_LONG, /* 170 */
259 TPM_UNDEFINED,
260 TPM_UNDEFINED,
261 TPM_UNDEFINED,
262 TPM_UNDEFINED,
263 TPM_UNDEFINED, /* 175 */
264 TPM_UNDEFINED,
265 TPM_UNDEFINED,
266 TPM_UNDEFINED,
267 TPM_UNDEFINED,
268 TPM_MEDIUM, /* 180 */
269 TPM_SHORT,
270 TPM_MEDIUM,
271 TPM_MEDIUM,
272 TPM_MEDIUM,
273 TPM_MEDIUM, /* 185 */
274 TPM_SHORT,
275 TPM_UNDEFINED,
276 TPM_UNDEFINED,
277 TPM_UNDEFINED,
278 TPM_UNDEFINED, /* 190 */
279 TPM_UNDEFINED,
280 TPM_UNDEFINED,
281 TPM_UNDEFINED,
282 TPM_UNDEFINED,
283 TPM_UNDEFINED, /* 195 */
284 TPM_UNDEFINED,
285 TPM_UNDEFINED,
286 TPM_UNDEFINED,
287 TPM_UNDEFINED,
288 TPM_SHORT, /* 200 */
289 TPM_UNDEFINED,
290 TPM_UNDEFINED,
291 TPM_UNDEFINED,
292 TPM_SHORT,
293 TPM_SHORT, /* 205 */
294 TPM_SHORT,
295 TPM_SHORT,
296 TPM_SHORT,
297 TPM_SHORT,
298 TPM_MEDIUM, /* 210 */
299 TPM_UNDEFINED,
300 TPM_MEDIUM,
301 TPM_MEDIUM,
302 TPM_MEDIUM,
303 TPM_UNDEFINED, /* 215 */
304 TPM_MEDIUM,
305 TPM_UNDEFINED,
306 TPM_UNDEFINED,
307 TPM_SHORT,
308 TPM_SHORT, /* 220 */
309 TPM_SHORT,
310 TPM_SHORT,
311 TPM_SHORT,
312 TPM_SHORT,
313 TPM_UNDEFINED, /* 225 */
314 TPM_UNDEFINED,
315 TPM_UNDEFINED,
316 TPM_UNDEFINED,
317 TPM_UNDEFINED,
318 TPM_SHORT, /* 230 */
319 TPM_LONG,
320 TPM_MEDIUM,
321 TPM_UNDEFINED,
322 TPM_UNDEFINED,
323 TPM_UNDEFINED, /* 235 */
324 TPM_UNDEFINED,
325 TPM_UNDEFINED,
326 TPM_UNDEFINED,
327 TPM_UNDEFINED,
328 TPM_SHORT, /* 240 */
329 TPM_UNDEFINED,
330 TPM_MEDIUM,
331 };
332
333 static void user_reader_timeout(unsigned long ptr)
334 {
335 struct tpm_chip *chip = (struct tpm_chip *) ptr;
336
337 schedule_work(&chip->work);
338 }
339
340 static void timeout_work(struct work_struct *work)
341 {
342 struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
343
344 mutex_lock(&chip->buffer_mutex);
345 atomic_set(&chip->data_pending, 0);
346 memset(chip->data_buffer, 0, TPM_BUFSIZE);
347 mutex_unlock(&chip->buffer_mutex);
348 }
349
350 /*
351 * Returns max number of jiffies to wait
352 */
353 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
354 u32 ordinal)
355 {
356 int duration_idx = TPM_UNDEFINED;
357 int duration = 0;
358
359 if (ordinal < TPM_MAX_ORDINAL)
360 duration_idx = tpm_ordinal_duration[ordinal];
361 else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
362 TPM_MAX_PROTECTED_ORDINAL)
363 duration_idx =
364 tpm_protected_ordinal_duration[ordinal &
365 TPM_PROTECTED_ORDINAL_MASK];
366
367 if (duration_idx != TPM_UNDEFINED)
368 duration = chip->vendor.duration[duration_idx];
369 if (duration <= 0)
370 return 2 * 60 * HZ;
371 else
372 return duration;
373 }
374 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
375
376 /*
377 * Internal kernel interface to transmit TPM commands
378 */
379 static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
380 size_t bufsiz)
381 {
382 ssize_t rc;
383 u32 count, ordinal;
384 unsigned long stop;
385
386 count = be32_to_cpu(*((__be32 *) (buf + 2)));
387 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
388 if (count == 0)
389 return -ENODATA;
390 if (count > bufsiz) {
391 dev_err(chip->dev,
392 "invalid count value %x %zx \n", count, bufsiz);
393 return -E2BIG;
394 }
395
396 mutex_lock(&chip->tpm_mutex);
397
398 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
399 dev_err(chip->dev,
400 "tpm_transmit: tpm_send: error %zd\n", rc);
401 goto out;
402 }
403
404 if (chip->vendor.irq)
405 goto out_recv;
406
407 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
408 do {
409 u8 status = chip->vendor.status(chip);
410 if ((status & chip->vendor.req_complete_mask) ==
411 chip->vendor.req_complete_val)
412 goto out_recv;
413
414 if ((status == chip->vendor.req_canceled)) {
415 dev_err(chip->dev, "Operation Canceled\n");
416 rc = -ECANCELED;
417 goto out;
418 }
419
420 msleep(TPM_TIMEOUT); /* CHECK */
421 rmb();
422 } while (time_before(jiffies, stop));
423
424 chip->vendor.cancel(chip);
425 dev_err(chip->dev, "Operation Timed out\n");
426 rc = -ETIME;
427 goto out;
428
429 out_recv:
430 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
431 if (rc < 0)
432 dev_err(chip->dev,
433 "tpm_transmit: tpm_recv: error %zd\n", rc);
434 out:
435 mutex_unlock(&chip->tpm_mutex);
436 return rc;
437 }
438
439 #define TPM_DIGEST_SIZE 20
440 #define TPM_ERROR_SIZE 10
441 #define TPM_RET_CODE_IDX 6
442
443 enum tpm_capabilities {
444 TPM_CAP_FLAG = cpu_to_be32(4),
445 TPM_CAP_PROP = cpu_to_be32(5),
446 CAP_VERSION_1_1 = cpu_to_be32(0x06),
447 CAP_VERSION_1_2 = cpu_to_be32(0x1A)
448 };
449
450 enum tpm_sub_capabilities {
451 TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
452 TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
453 TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
454 TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
455 TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
456 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
457 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
458
459 };
460
461 static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
462 int len, const char *desc)
463 {
464 int err;
465
466 len = tpm_transmit(chip,(u8 *) cmd, len);
467 if (len < 0)
468 return len;
469 if (len == TPM_ERROR_SIZE) {
470 err = be32_to_cpu(cmd->header.out.return_code);
471 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
472 return err;
473 }
474 return 0;
475 }
476
477 #define TPM_INTERNAL_RESULT_SIZE 200
478 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
479 #define TPM_ORD_GET_CAP cpu_to_be32(101)
480
481 static const struct tpm_input_header tpm_getcap_header = {
482 .tag = TPM_TAG_RQU_COMMAND,
483 .length = cpu_to_be32(22),
484 .ordinal = TPM_ORD_GET_CAP
485 };
486
487 ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
488 const char *desc)
489 {
490 struct tpm_cmd_t tpm_cmd;
491 int rc;
492 struct tpm_chip *chip = dev_get_drvdata(dev);
493
494 tpm_cmd.header.in = tpm_getcap_header;
495 if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
496 tpm_cmd.params.getcap_in.cap = subcap_id;
497 /*subcap field not necessary */
498 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
499 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
500 } else {
501 if (subcap_id == TPM_CAP_FLAG_PERM ||
502 subcap_id == TPM_CAP_FLAG_VOL)
503 tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
504 else
505 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
506 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
507 tpm_cmd.params.getcap_in.subcap = subcap_id;
508 }
509 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
510 if (!rc)
511 *cap = tpm_cmd.params.getcap_out.cap;
512 return rc;
513 }
514
515 void tpm_gen_interrupt(struct tpm_chip *chip)
516 {
517 struct tpm_cmd_t tpm_cmd;
518 ssize_t rc;
519
520 tpm_cmd.header.in = tpm_getcap_header;
521 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
522 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
523 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
524
525 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
526 "attempting to determine the timeouts");
527 }
528 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
529
530 void tpm_get_timeouts(struct tpm_chip *chip)
531 {
532 struct tpm_cmd_t tpm_cmd;
533 struct timeout_t *timeout_cap;
534 struct duration_t *duration_cap;
535 ssize_t rc;
536 u32 timeout;
537 unsigned int scale = 1;
538
539 tpm_cmd.header.in = tpm_getcap_header;
540 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
541 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
542 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
543
544 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
545 "attempting to determine the timeouts");
546 if (rc)
547 goto duration;
548
549 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
550 be32_to_cpu(tpm_cmd.header.out.length)
551 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
552 return;
553
554 timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
555 /* Don't overwrite default if value is 0 */
556 timeout = be32_to_cpu(timeout_cap->a);
557 if (timeout && timeout < 1000) {
558 /* timeouts in msec rather usec */
559 scale = 1000;
560 chip->vendor.timeout_adjusted = true;
561 }
562 if (timeout)
563 chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
564 timeout = be32_to_cpu(timeout_cap->b);
565 if (timeout)
566 chip->vendor.timeout_b = usecs_to_jiffies(timeout * scale);
567 timeout = be32_to_cpu(timeout_cap->c);
568 if (timeout)
569 chip->vendor.timeout_c = usecs_to_jiffies(timeout * scale);
570 timeout = be32_to_cpu(timeout_cap->d);
571 if (timeout)
572 chip->vendor.timeout_d = usecs_to_jiffies(timeout * scale);
573
574 duration:
575 tpm_cmd.header.in = tpm_getcap_header;
576 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
577 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
578 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
579
580 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
581 "attempting to determine the durations");
582 if (rc)
583 return;
584
585 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
586 be32_to_cpu(tpm_cmd.header.out.length)
587 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
588 return;
589
590 duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
591 chip->vendor.duration[TPM_SHORT] =
592 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
593 chip->vendor.duration[TPM_MEDIUM] =
594 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
595 chip->vendor.duration[TPM_LONG] =
596 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
597
598 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
599 * value wrong and apparently reports msecs rather than usecs. So we
600 * fix up the resulting too-small TPM_SHORT value to make things work.
601 * We also scale the TPM_MEDIUM and -_LONG values by 1000.
602 */
603 if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
604 chip->vendor.duration[TPM_SHORT] = HZ;
605 chip->vendor.duration[TPM_MEDIUM] *= 1000;
606 chip->vendor.duration[TPM_LONG] *= 1000;
607 chip->vendor.duration_adjusted = true;
608 dev_info(chip->dev, "Adjusting TPM timeout parameters.");
609 }
610 }
611 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
612
613 void tpm_continue_selftest(struct tpm_chip *chip)
614 {
615 u8 data[] = {
616 0, 193, /* TPM_TAG_RQU_COMMAND */
617 0, 0, 0, 10, /* length */
618 0, 0, 0, 83, /* TPM_ORD_ContinueSelfTest */
619 };
620
621 tpm_transmit(chip, data, sizeof(data));
622 }
623 EXPORT_SYMBOL_GPL(tpm_continue_selftest);
624
625 ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
626 char *buf)
627 {
628 cap_t cap;
629 ssize_t rc;
630
631 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
632 "attempting to determine the permanent enabled state");
633 if (rc)
634 return 0;
635
636 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
637 return rc;
638 }
639 EXPORT_SYMBOL_GPL(tpm_show_enabled);
640
641 ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
642 char *buf)
643 {
644 cap_t cap;
645 ssize_t rc;
646
647 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
648 "attempting to determine the permanent active state");
649 if (rc)
650 return 0;
651
652 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
653 return rc;
654 }
655 EXPORT_SYMBOL_GPL(tpm_show_active);
656
657 ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
658 char *buf)
659 {
660 cap_t cap;
661 ssize_t rc;
662
663 rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
664 "attempting to determine the owner state");
665 if (rc)
666 return 0;
667
668 rc = sprintf(buf, "%d\n", cap.owned);
669 return rc;
670 }
671 EXPORT_SYMBOL_GPL(tpm_show_owned);
672
673 ssize_t tpm_show_temp_deactivated(struct device * dev,
674 struct device_attribute * attr, char *buf)
675 {
676 cap_t cap;
677 ssize_t rc;
678
679 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
680 "attempting to determine the temporary state");
681 if (rc)
682 return 0;
683
684 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
685 return rc;
686 }
687 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
688
689 /*
690 * tpm_chip_find_get - return tpm_chip for given chip number
691 */
692 static struct tpm_chip *tpm_chip_find_get(int chip_num)
693 {
694 struct tpm_chip *pos, *chip = NULL;
695
696 rcu_read_lock();
697 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
698 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
699 continue;
700
701 if (try_module_get(pos->dev->driver->owner)) {
702 chip = pos;
703 break;
704 }
705 }
706 rcu_read_unlock();
707 return chip;
708 }
709
710 #define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
711 #define READ_PCR_RESULT_SIZE 30
712 static struct tpm_input_header pcrread_header = {
713 .tag = TPM_TAG_RQU_COMMAND,
714 .length = cpu_to_be32(14),
715 .ordinal = TPM_ORDINAL_PCRREAD
716 };
717
718 int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
719 {
720 int rc;
721 struct tpm_cmd_t cmd;
722
723 cmd.header.in = pcrread_header;
724 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
725 rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
726 "attempting to read a pcr value");
727
728 if (rc == 0)
729 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
730 TPM_DIGEST_SIZE);
731 return rc;
732 }
733
734 /**
735 * tpm_pcr_read - read a pcr value
736 * @chip_num: tpm idx # or ANY
737 * @pcr_idx: pcr idx to retrieve
738 * @res_buf: TPM_PCR value
739 * size of res_buf is 20 bytes (or NULL if you don't care)
740 *
741 * The TPM driver should be built-in, but for whatever reason it
742 * isn't, protect against the chip disappearing, by incrementing
743 * the module usage count.
744 */
745 int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
746 {
747 struct tpm_chip *chip;
748 int rc;
749
750 chip = tpm_chip_find_get(chip_num);
751 if (chip == NULL)
752 return -ENODEV;
753 rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
754 tpm_chip_put(chip);
755 return rc;
756 }
757 EXPORT_SYMBOL_GPL(tpm_pcr_read);
758
759 /**
760 * tpm_pcr_extend - extend pcr value with hash
761 * @chip_num: tpm idx # or AN&
762 * @pcr_idx: pcr idx to extend
763 * @hash: hash value used to extend pcr value
764 *
765 * The TPM driver should be built-in, but for whatever reason it
766 * isn't, protect against the chip disappearing, by incrementing
767 * the module usage count.
768 */
769 #define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
770 #define EXTEND_PCR_RESULT_SIZE 34
771 static struct tpm_input_header pcrextend_header = {
772 .tag = TPM_TAG_RQU_COMMAND,
773 .length = cpu_to_be32(34),
774 .ordinal = TPM_ORD_PCR_EXTEND
775 };
776
777 int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
778 {
779 struct tpm_cmd_t cmd;
780 int rc;
781 struct tpm_chip *chip;
782
783 chip = tpm_chip_find_get(chip_num);
784 if (chip == NULL)
785 return -ENODEV;
786
787 cmd.header.in = pcrextend_header;
788 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
789 memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
790 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
791 "attempting extend a PCR value");
792
793 tpm_chip_put(chip);
794 return rc;
795 }
796 EXPORT_SYMBOL_GPL(tpm_pcr_extend);
797
798 int tpm_send(u32 chip_num, void *cmd, size_t buflen)
799 {
800 struct tpm_chip *chip;
801 int rc;
802
803 chip = tpm_chip_find_get(chip_num);
804 if (chip == NULL)
805 return -ENODEV;
806
807 rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
808
809 tpm_chip_put(chip);
810 return rc;
811 }
812 EXPORT_SYMBOL_GPL(tpm_send);
813
814 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
815 char *buf)
816 {
817 cap_t cap;
818 u8 digest[TPM_DIGEST_SIZE];
819 ssize_t rc;
820 int i, j, num_pcrs;
821 char *str = buf;
822 struct tpm_chip *chip = dev_get_drvdata(dev);
823
824 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
825 "attempting to determine the number of PCRS");
826 if (rc)
827 return 0;
828
829 num_pcrs = be32_to_cpu(cap.num_pcrs);
830 for (i = 0; i < num_pcrs; i++) {
831 rc = __tpm_pcr_read(chip, i, digest);
832 if (rc)
833 break;
834 str += sprintf(str, "PCR-%02d: ", i);
835 for (j = 0; j < TPM_DIGEST_SIZE; j++)
836 str += sprintf(str, "%02X ", digest[j]);
837 str += sprintf(str, "\n");
838 }
839 return str - buf;
840 }
841 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
842
843 #define READ_PUBEK_RESULT_SIZE 314
844 #define TPM_ORD_READPUBEK cpu_to_be32(124)
845 struct tpm_input_header tpm_readpubek_header = {
846 .tag = TPM_TAG_RQU_COMMAND,
847 .length = cpu_to_be32(30),
848 .ordinal = TPM_ORD_READPUBEK
849 };
850
851 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
852 char *buf)
853 {
854 u8 *data;
855 struct tpm_cmd_t tpm_cmd;
856 ssize_t err;
857 int i, rc;
858 char *str = buf;
859
860 struct tpm_chip *chip = dev_get_drvdata(dev);
861
862 tpm_cmd.header.in = tpm_readpubek_header;
863 err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
864 "attempting to read the PUBEK");
865 if (err)
866 goto out;
867
868 /*
869 ignore header 10 bytes
870 algorithm 32 bits (1 == RSA )
871 encscheme 16 bits
872 sigscheme 16 bits
873 parameters (RSA 12->bytes: keybit, #primes, expbit)
874 keylenbytes 32 bits
875 256 byte modulus
876 ignore checksum 20 bytes
877 */
878 data = tpm_cmd.params.readpubek_out_buffer;
879 str +=
880 sprintf(str,
881 "Algorithm: %02X %02X %02X %02X\n"
882 "Encscheme: %02X %02X\n"
883 "Sigscheme: %02X %02X\n"
884 "Parameters: %02X %02X %02X %02X "
885 "%02X %02X %02X %02X "
886 "%02X %02X %02X %02X\n"
887 "Modulus length: %d\n"
888 "Modulus:\n",
889 data[0], data[1], data[2], data[3],
890 data[4], data[5],
891 data[6], data[7],
892 data[12], data[13], data[14], data[15],
893 data[16], data[17], data[18], data[19],
894 data[20], data[21], data[22], data[23],
895 be32_to_cpu(*((__be32 *) (data + 24))));
896
897 for (i = 0; i < 256; i++) {
898 str += sprintf(str, "%02X ", data[i + 28]);
899 if ((i + 1) % 16 == 0)
900 str += sprintf(str, "\n");
901 }
902 out:
903 rc = str - buf;
904 return rc;
905 }
906 EXPORT_SYMBOL_GPL(tpm_show_pubek);
907
908
909 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
910 char *buf)
911 {
912 cap_t cap;
913 ssize_t rc;
914 char *str = buf;
915
916 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
917 "attempting to determine the manufacturer");
918 if (rc)
919 return 0;
920 str += sprintf(str, "Manufacturer: 0x%x\n",
921 be32_to_cpu(cap.manufacturer_id));
922
923 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
924 "attempting to determine the 1.1 version");
925 if (rc)
926 return 0;
927 str += sprintf(str,
928 "TCG version: %d.%d\nFirmware version: %d.%d\n",
929 cap.tpm_version.Major, cap.tpm_version.Minor,
930 cap.tpm_version.revMajor, cap.tpm_version.revMinor);
931 return str - buf;
932 }
933 EXPORT_SYMBOL_GPL(tpm_show_caps);
934
935 ssize_t tpm_show_caps_1_2(struct device * dev,
936 struct device_attribute * attr, char *buf)
937 {
938 cap_t cap;
939 ssize_t rc;
940 char *str = buf;
941
942 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
943 "attempting to determine the manufacturer");
944 if (rc)
945 return 0;
946 str += sprintf(str, "Manufacturer: 0x%x\n",
947 be32_to_cpu(cap.manufacturer_id));
948 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
949 "attempting to determine the 1.2 version");
950 if (rc)
951 return 0;
952 str += sprintf(str,
953 "TCG version: %d.%d\nFirmware version: %d.%d\n",
954 cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
955 cap.tpm_version_1_2.revMajor,
956 cap.tpm_version_1_2.revMinor);
957 return str - buf;
958 }
959 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
960
961 ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
962 char *buf)
963 {
964 struct tpm_chip *chip = dev_get_drvdata(dev);
965
966 if (chip->vendor.duration[TPM_LONG] == 0)
967 return 0;
968
969 return sprintf(buf, "%d %d %d [%s]\n",
970 jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
971 jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
972 jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
973 chip->vendor.duration_adjusted
974 ? "adjusted" : "original");
975 }
976 EXPORT_SYMBOL_GPL(tpm_show_durations);
977
978 ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
979 char *buf)
980 {
981 struct tpm_chip *chip = dev_get_drvdata(dev);
982
983 return sprintf(buf, "%d %d %d %d [%s]\n",
984 jiffies_to_usecs(chip->vendor.timeout_a),
985 jiffies_to_usecs(chip->vendor.timeout_b),
986 jiffies_to_usecs(chip->vendor.timeout_c),
987 jiffies_to_usecs(chip->vendor.timeout_d),
988 chip->vendor.timeout_adjusted
989 ? "adjusted" : "original");
990 }
991 EXPORT_SYMBOL_GPL(tpm_show_timeouts);
992
993 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
994 const char *buf, size_t count)
995 {
996 struct tpm_chip *chip = dev_get_drvdata(dev);
997 if (chip == NULL)
998 return 0;
999
1000 chip->vendor.cancel(chip);
1001 return count;
1002 }
1003 EXPORT_SYMBOL_GPL(tpm_store_cancel);
1004
1005 /*
1006 * Device file system interface to the TPM
1007 *
1008 * It's assured that the chip will be opened just once,
1009 * by the check of is_open variable, which is protected
1010 * by driver_lock.
1011 */
1012 int tpm_open(struct inode *inode, struct file *file)
1013 {
1014 int minor = iminor(inode);
1015 struct tpm_chip *chip = NULL, *pos;
1016
1017 rcu_read_lock();
1018 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
1019 if (pos->vendor.miscdev.minor == minor) {
1020 chip = pos;
1021 get_device(chip->dev);
1022 break;
1023 }
1024 }
1025 rcu_read_unlock();
1026
1027 if (!chip)
1028 return -ENODEV;
1029
1030 if (test_and_set_bit(0, &chip->is_open)) {
1031 dev_dbg(chip->dev, "Another process owns this TPM\n");
1032 put_device(chip->dev);
1033 return -EBUSY;
1034 }
1035
1036 chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
1037 if (chip->data_buffer == NULL) {
1038 clear_bit(0, &chip->is_open);
1039 put_device(chip->dev);
1040 return -ENOMEM;
1041 }
1042
1043 atomic_set(&chip->data_pending, 0);
1044
1045 file->private_data = chip;
1046 return 0;
1047 }
1048 EXPORT_SYMBOL_GPL(tpm_open);
1049
1050 /*
1051 * Called on file close
1052 */
1053 int tpm_release(struct inode *inode, struct file *file)
1054 {
1055 struct tpm_chip *chip = file->private_data;
1056
1057 del_singleshot_timer_sync(&chip->user_read_timer);
1058 flush_work_sync(&chip->work);
1059 file->private_data = NULL;
1060 atomic_set(&chip->data_pending, 0);
1061 kfree(chip->data_buffer);
1062 clear_bit(0, &chip->is_open);
1063 put_device(chip->dev);
1064 return 0;
1065 }
1066 EXPORT_SYMBOL_GPL(tpm_release);
1067
1068 ssize_t tpm_write(struct file *file, const char __user *buf,
1069 size_t size, loff_t *off)
1070 {
1071 struct tpm_chip *chip = file->private_data;
1072 size_t in_size = size, out_size;
1073
1074 /* cannot perform a write until the read has cleared
1075 either via tpm_read or a user_read_timer timeout */
1076 while (atomic_read(&chip->data_pending) != 0)
1077 msleep(TPM_TIMEOUT);
1078
1079 mutex_lock(&chip->buffer_mutex);
1080
1081 if (in_size > TPM_BUFSIZE)
1082 in_size = TPM_BUFSIZE;
1083
1084 if (copy_from_user
1085 (chip->data_buffer, (void __user *) buf, in_size)) {
1086 mutex_unlock(&chip->buffer_mutex);
1087 return -EFAULT;
1088 }
1089
1090 /* atomic tpm command send and result receive */
1091 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1092
1093 atomic_set(&chip->data_pending, out_size);
1094 mutex_unlock(&chip->buffer_mutex);
1095
1096 /* Set a timeout by which the reader must come claim the result */
1097 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1098
1099 return in_size;
1100 }
1101 EXPORT_SYMBOL_GPL(tpm_write);
1102
1103 ssize_t tpm_read(struct file *file, char __user *buf,
1104 size_t size, loff_t *off)
1105 {
1106 struct tpm_chip *chip = file->private_data;
1107 ssize_t ret_size;
1108
1109 del_singleshot_timer_sync(&chip->user_read_timer);
1110 flush_work_sync(&chip->work);
1111 ret_size = atomic_read(&chip->data_pending);
1112 atomic_set(&chip->data_pending, 0);
1113 if (ret_size > 0) { /* relay data */
1114 if (size < ret_size)
1115 ret_size = size;
1116
1117 mutex_lock(&chip->buffer_mutex);
1118 if (copy_to_user(buf, chip->data_buffer, ret_size))
1119 ret_size = -EFAULT;
1120 mutex_unlock(&chip->buffer_mutex);
1121 }
1122
1123 return ret_size;
1124 }
1125 EXPORT_SYMBOL_GPL(tpm_read);
1126
1127 void tpm_remove_hardware(struct device *dev)
1128 {
1129 struct tpm_chip *chip = dev_get_drvdata(dev);
1130
1131 if (chip == NULL) {
1132 dev_err(dev, "No device data found\n");
1133 return;
1134 }
1135
1136 spin_lock(&driver_lock);
1137 list_del_rcu(&chip->list);
1138 spin_unlock(&driver_lock);
1139 synchronize_rcu();
1140
1141 misc_deregister(&chip->vendor.miscdev);
1142 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1143 tpm_bios_log_teardown(chip->bios_dir);
1144
1145 /* write it this way to be explicit (chip->dev == dev) */
1146 put_device(chip->dev);
1147 }
1148 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1149
1150 #define TPM_ORD_SAVESTATE cpu_to_be32(152)
1151 #define SAVESTATE_RESULT_SIZE 10
1152
1153 static struct tpm_input_header savestate_header = {
1154 .tag = TPM_TAG_RQU_COMMAND,
1155 .length = cpu_to_be32(10),
1156 .ordinal = TPM_ORD_SAVESTATE
1157 };
1158
1159 /*
1160 * We are about to suspend. Save the TPM state
1161 * so that it can be restored.
1162 */
1163 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1164 {
1165 struct tpm_chip *chip = dev_get_drvdata(dev);
1166 struct tpm_cmd_t cmd;
1167 int rc;
1168
1169 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
1170
1171 if (chip == NULL)
1172 return -ENODEV;
1173
1174 /* for buggy tpm, flush pcrs with extend to selected dummy */
1175 if (tpm_suspend_pcr) {
1176 cmd.header.in = pcrextend_header;
1177 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1178 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1179 TPM_DIGEST_SIZE);
1180 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1181 "extending dummy pcr before suspend");
1182 }
1183
1184 /* now do the actual savestate */
1185 cmd.header.in = savestate_header;
1186 rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
1187 "sending savestate before suspend");
1188 return rc;
1189 }
1190 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1191
1192 /*
1193 * Resume from a power safe. The BIOS already restored
1194 * the TPM state.
1195 */
1196 int tpm_pm_resume(struct device *dev)
1197 {
1198 struct tpm_chip *chip = dev_get_drvdata(dev);
1199
1200 if (chip == NULL)
1201 return -ENODEV;
1202
1203 return 0;
1204 }
1205 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1206
1207 /* In case vendor provided release function, call it too.*/
1208
1209 void tpm_dev_vendor_release(struct tpm_chip *chip)
1210 {
1211 if (chip->vendor.release)
1212 chip->vendor.release(chip->dev);
1213
1214 clear_bit(chip->dev_num, dev_mask);
1215 kfree(chip->vendor.miscdev.name);
1216 }
1217 EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1218
1219
1220 /*
1221 * Once all references to platform device are down to 0,
1222 * release all allocated structures.
1223 */
1224 void tpm_dev_release(struct device *dev)
1225 {
1226 struct tpm_chip *chip = dev_get_drvdata(dev);
1227
1228 tpm_dev_vendor_release(chip);
1229
1230 chip->release(dev);
1231 kfree(chip);
1232 }
1233 EXPORT_SYMBOL_GPL(tpm_dev_release);
1234
1235 /*
1236 * Called from tpm_<specific>.c probe function only for devices
1237 * the driver has determined it should claim. Prior to calling
1238 * this function the specific probe function has called pci_enable_device
1239 * upon errant exit from this function specific probe function should call
1240 * pci_disable_device
1241 */
1242 struct tpm_chip *tpm_register_hardware(struct device *dev,
1243 const struct tpm_vendor_specific *entry)
1244 {
1245 #define DEVNAME_SIZE 7
1246
1247 char *devname;
1248 struct tpm_chip *chip;
1249
1250 /* Driver specific per-device data */
1251 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1252 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1253
1254 if (chip == NULL || devname == NULL)
1255 goto out_free;
1256
1257 mutex_init(&chip->buffer_mutex);
1258 mutex_init(&chip->tpm_mutex);
1259 INIT_LIST_HEAD(&chip->list);
1260
1261 INIT_WORK(&chip->work, timeout_work);
1262
1263 setup_timer(&chip->user_read_timer, user_reader_timeout,
1264 (unsigned long)chip);
1265
1266 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1267
1268 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1269
1270 if (chip->dev_num >= TPM_NUM_DEVICES) {
1271 dev_err(dev, "No available tpm device numbers\n");
1272 goto out_free;
1273 } else if (chip->dev_num == 0)
1274 chip->vendor.miscdev.minor = TPM_MINOR;
1275 else
1276 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1277
1278 set_bit(chip->dev_num, dev_mask);
1279
1280 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
1281 chip->vendor.miscdev.name = devname;
1282
1283 chip->vendor.miscdev.parent = dev;
1284 chip->dev = get_device(dev);
1285 chip->release = dev->release;
1286 dev->release = tpm_dev_release;
1287 dev_set_drvdata(dev, chip);
1288
1289 if (misc_register(&chip->vendor.miscdev)) {
1290 dev_err(chip->dev,
1291 "unable to misc_register %s, minor %d\n",
1292 chip->vendor.miscdev.name,
1293 chip->vendor.miscdev.minor);
1294 put_device(chip->dev);
1295 return NULL;
1296 }
1297
1298 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1299 misc_deregister(&chip->vendor.miscdev);
1300 put_device(chip->dev);
1301
1302 return NULL;
1303 }
1304
1305 chip->bios_dir = tpm_bios_log_setup(devname);
1306
1307 /* Make chip available */
1308 spin_lock(&driver_lock);
1309 list_add_rcu(&chip->list, &tpm_chip_list);
1310 spin_unlock(&driver_lock);
1311
1312 return chip;
1313
1314 out_free:
1315 kfree(chip);
1316 kfree(devname);
1317 return NULL;
1318 }
1319 EXPORT_SYMBOL_GPL(tpm_register_hardware);
1320
1321 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1322 MODULE_DESCRIPTION("TPM Driver");
1323 MODULE_VERSION("2.0");
1324 MODULE_LICENSE("GPL");
linux-next