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USB: serial: fix whitespace issues
[zen-stable.git] / drivers / char / tpm / tpm.c
blob361a1dff8f772e9d1aa2d855300046ca50291c03
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 if (bufsiz > TPM_BUFSIZE)
387 bufsiz = TPM_BUFSIZE;
388
389 count = be32_to_cpu(*((__be32 *) (buf + 2)));
390 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
391 if (count == 0)
392 return -ENODATA;
393 if (count > bufsiz) {
394 dev_err(chip->dev,
395 "invalid count value %x %zx \n", count, bufsiz);
396 return -E2BIG;
397 }
398
399 mutex_lock(&chip->tpm_mutex);
400
401 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
402 dev_err(chip->dev,
403 "tpm_transmit: tpm_send: error %zd\n", rc);
404 goto out;
405 }
406
407 if (chip->vendor.irq)
408 goto out_recv;
409
410 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
411 do {
412 u8 status = chip->vendor.status(chip);
413 if ((status & chip->vendor.req_complete_mask) ==
414 chip->vendor.req_complete_val)
415 goto out_recv;
416
417 if ((status == chip->vendor.req_canceled)) {
418 dev_err(chip->dev, "Operation Canceled\n");
419 rc = -ECANCELED;
420 goto out;
421 }
422
423 msleep(TPM_TIMEOUT); /* CHECK */
424 rmb();
425 } while (time_before(jiffies, stop));
426
427 chip->vendor.cancel(chip);
428 dev_err(chip->dev, "Operation Timed out\n");
429 rc = -ETIME;
430 goto out;
431
432 out_recv:
433 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
434 if (rc < 0)
435 dev_err(chip->dev,
436 "tpm_transmit: tpm_recv: error %zd\n", rc);
437 out:
438 mutex_unlock(&chip->tpm_mutex);
439 return rc;
440 }
441
442 #define TPM_DIGEST_SIZE 20
443 #define TPM_ERROR_SIZE 10
444 #define TPM_RET_CODE_IDX 6
445
446 enum tpm_capabilities {
447 TPM_CAP_FLAG = cpu_to_be32(4),
448 TPM_CAP_PROP = cpu_to_be32(5),
449 CAP_VERSION_1_1 = cpu_to_be32(0x06),
450 CAP_VERSION_1_2 = cpu_to_be32(0x1A)
451 };
452
453 enum tpm_sub_capabilities {
454 TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
455 TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
456 TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
457 TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
458 TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
459 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
460 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
461
462 };
463
464 static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
465 int len, const char *desc)
466 {
467 int err;
468
469 len = tpm_transmit(chip,(u8 *) cmd, len);
470 if (len < 0)
471 return len;
472 if (len == TPM_ERROR_SIZE) {
473 err = be32_to_cpu(cmd->header.out.return_code);
474 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
475 return err;
476 }
477 return 0;
478 }
479
480 #define TPM_INTERNAL_RESULT_SIZE 200
481 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
482 #define TPM_ORD_GET_CAP cpu_to_be32(101)
483
484 static const struct tpm_input_header tpm_getcap_header = {
485 .tag = TPM_TAG_RQU_COMMAND,
486 .length = cpu_to_be32(22),
487 .ordinal = TPM_ORD_GET_CAP
488 };
489
490 ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
491 const char *desc)
492 {
493 struct tpm_cmd_t tpm_cmd;
494 int rc;
495 struct tpm_chip *chip = dev_get_drvdata(dev);
496
497 tpm_cmd.header.in = tpm_getcap_header;
498 if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
499 tpm_cmd.params.getcap_in.cap = subcap_id;
500 /*subcap field not necessary */
501 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
502 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
503 } else {
504 if (subcap_id == TPM_CAP_FLAG_PERM ||
505 subcap_id == TPM_CAP_FLAG_VOL)
506 tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
507 else
508 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
509 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
510 tpm_cmd.params.getcap_in.subcap = subcap_id;
511 }
512 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
513 if (!rc)
514 *cap = tpm_cmd.params.getcap_out.cap;
515 return rc;
516 }
517
518 void tpm_gen_interrupt(struct tpm_chip *chip)
519 {
520 struct tpm_cmd_t tpm_cmd;
521 ssize_t rc;
522
523 tpm_cmd.header.in = tpm_getcap_header;
524 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
525 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
526 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
527
528 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
529 "attempting to determine the timeouts");
530 }
531 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
532
533 void tpm_get_timeouts(struct tpm_chip *chip)
534 {
535 struct tpm_cmd_t tpm_cmd;
536 struct timeout_t *timeout_cap;
537 struct duration_t *duration_cap;
538 ssize_t rc;
539 u32 timeout;
540 unsigned int scale = 1;
541
542 tpm_cmd.header.in = tpm_getcap_header;
543 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
544 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
545 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
546
547 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
548 "attempting to determine the timeouts");
549 if (rc)
550 goto duration;
551
552 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
553 be32_to_cpu(tpm_cmd.header.out.length)
554 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
555 return;
556
557 timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
558 /* Don't overwrite default if value is 0 */
559 timeout = be32_to_cpu(timeout_cap->a);
560 if (timeout && timeout < 1000) {
561 /* timeouts in msec rather usec */
562 scale = 1000;
563 chip->vendor.timeout_adjusted = true;
564 }
565 if (timeout)
566 chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
567 timeout = be32_to_cpu(timeout_cap->b);
568 if (timeout)
569 chip->vendor.timeout_b = usecs_to_jiffies(timeout * scale);
570 timeout = be32_to_cpu(timeout_cap->c);
571 if (timeout)
572 chip->vendor.timeout_c = usecs_to_jiffies(timeout * scale);
573 timeout = be32_to_cpu(timeout_cap->d);
574 if (timeout)
575 chip->vendor.timeout_d = usecs_to_jiffies(timeout * scale);
576
577 duration:
578 tpm_cmd.header.in = tpm_getcap_header;
579 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
580 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
581 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
582
583 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
584 "attempting to determine the durations");
585 if (rc)
586 return;
587
588 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
589 be32_to_cpu(tpm_cmd.header.out.length)
590 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
591 return;
592
593 duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
594 chip->vendor.duration[TPM_SHORT] =
595 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
596 chip->vendor.duration[TPM_MEDIUM] =
597 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
598 chip->vendor.duration[TPM_LONG] =
599 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
600
601 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
602 * value wrong and apparently reports msecs rather than usecs. So we
603 * fix up the resulting too-small TPM_SHORT value to make things work.
604 * We also scale the TPM_MEDIUM and -_LONG values by 1000.
605 */
606 if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
607 chip->vendor.duration[TPM_SHORT] = HZ;
608 chip->vendor.duration[TPM_MEDIUM] *= 1000;
609 chip->vendor.duration[TPM_LONG] *= 1000;
610 chip->vendor.duration_adjusted = true;
611 dev_info(chip->dev, "Adjusting TPM timeout parameters.");
612 }
613 }
614 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
615
616 void tpm_continue_selftest(struct tpm_chip *chip)
617 {
618 u8 data[] = {
619 0, 193, /* TPM_TAG_RQU_COMMAND */
620 0, 0, 0, 10, /* length */
621 0, 0, 0, 83, /* TPM_ORD_ContinueSelfTest */
622 };
623
624 tpm_transmit(chip, data, sizeof(data));
625 }
626 EXPORT_SYMBOL_GPL(tpm_continue_selftest);
627
628 ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
629 char *buf)
630 {
631 cap_t cap;
632 ssize_t rc;
633
634 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
635 "attempting to determine the permanent enabled state");
636 if (rc)
637 return 0;
638
639 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
640 return rc;
641 }
642 EXPORT_SYMBOL_GPL(tpm_show_enabled);
643
644 ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
645 char *buf)
646 {
647 cap_t cap;
648 ssize_t rc;
649
650 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
651 "attempting to determine the permanent active state");
652 if (rc)
653 return 0;
654
655 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
656 return rc;
657 }
658 EXPORT_SYMBOL_GPL(tpm_show_active);
659
660 ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
661 char *buf)
662 {
663 cap_t cap;
664 ssize_t rc;
665
666 rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
667 "attempting to determine the owner state");
668 if (rc)
669 return 0;
670
671 rc = sprintf(buf, "%d\n", cap.owned);
672 return rc;
673 }
674 EXPORT_SYMBOL_GPL(tpm_show_owned);
675
676 ssize_t tpm_show_temp_deactivated(struct device * dev,
677 struct device_attribute * attr, char *buf)
678 {
679 cap_t cap;
680 ssize_t rc;
681
682 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
683 "attempting to determine the temporary state");
684 if (rc)
685 return 0;
686
687 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
688 return rc;
689 }
690 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
691
692 /*
693 * tpm_chip_find_get - return tpm_chip for given chip number
694 */
695 static struct tpm_chip *tpm_chip_find_get(int chip_num)
696 {
697 struct tpm_chip *pos, *chip = NULL;
698
699 rcu_read_lock();
700 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
701 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
702 continue;
703
704 if (try_module_get(pos->dev->driver->owner)) {
705 chip = pos;
706 break;
707 }
708 }
709 rcu_read_unlock();
710 return chip;
711 }
712
713 #define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
714 #define READ_PCR_RESULT_SIZE 30
715 static struct tpm_input_header pcrread_header = {
716 .tag = TPM_TAG_RQU_COMMAND,
717 .length = cpu_to_be32(14),
718 .ordinal = TPM_ORDINAL_PCRREAD
719 };
720
721 int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
722 {
723 int rc;
724 struct tpm_cmd_t cmd;
725
726 cmd.header.in = pcrread_header;
727 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
728 rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
729 "attempting to read a pcr value");
730
731 if (rc == 0)
732 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
733 TPM_DIGEST_SIZE);
734 return rc;
735 }
736
737 /**
738 * tpm_pcr_read - read a pcr value
739 * @chip_num: tpm idx # or ANY
740 * @pcr_idx: pcr idx to retrieve
741 * @res_buf: TPM_PCR value
742 * size of res_buf is 20 bytes (or NULL if you don't care)
743 *
744 * The TPM driver should be built-in, but for whatever reason it
745 * isn't, protect against the chip disappearing, by incrementing
746 * the module usage count.
747 */
748 int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
749 {
750 struct tpm_chip *chip;
751 int rc;
752
753 chip = tpm_chip_find_get(chip_num);
754 if (chip == NULL)
755 return -ENODEV;
756 rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
757 tpm_chip_put(chip);
758 return rc;
759 }
760 EXPORT_SYMBOL_GPL(tpm_pcr_read);
761
762 /**
763 * tpm_pcr_extend - extend pcr value with hash
764 * @chip_num: tpm idx # or AN&
765 * @pcr_idx: pcr idx to extend
766 * @hash: hash value used to extend pcr value
767 *
768 * The TPM driver should be built-in, but for whatever reason it
769 * isn't, protect against the chip disappearing, by incrementing
770 * the module usage count.
771 */
772 #define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
773 #define EXTEND_PCR_RESULT_SIZE 34
774 static struct tpm_input_header pcrextend_header = {
775 .tag = TPM_TAG_RQU_COMMAND,
776 .length = cpu_to_be32(34),
777 .ordinal = TPM_ORD_PCR_EXTEND
778 };
779
780 int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
781 {
782 struct tpm_cmd_t cmd;
783 int rc;
784 struct tpm_chip *chip;
785
786 chip = tpm_chip_find_get(chip_num);
787 if (chip == NULL)
788 return -ENODEV;
789
790 cmd.header.in = pcrextend_header;
791 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
792 memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
793 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
794 "attempting extend a PCR value");
795
796 tpm_chip_put(chip);
797 return rc;
798 }
799 EXPORT_SYMBOL_GPL(tpm_pcr_extend);
800
801 int tpm_send(u32 chip_num, void *cmd, size_t buflen)
802 {
803 struct tpm_chip *chip;
804 int rc;
805
806 chip = tpm_chip_find_get(chip_num);
807 if (chip == NULL)
808 return -ENODEV;
809
810 rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
811
812 tpm_chip_put(chip);
813 return rc;
814 }
815 EXPORT_SYMBOL_GPL(tpm_send);
816
817 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
818 char *buf)
819 {
820 cap_t cap;
821 u8 digest[TPM_DIGEST_SIZE];
822 ssize_t rc;
823 int i, j, num_pcrs;
824 char *str = buf;
825 struct tpm_chip *chip = dev_get_drvdata(dev);
826
827 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
828 "attempting to determine the number of PCRS");
829 if (rc)
830 return 0;
831
832 num_pcrs = be32_to_cpu(cap.num_pcrs);
833 for (i = 0; i < num_pcrs; i++) {
834 rc = __tpm_pcr_read(chip, i, digest);
835 if (rc)
836 break;
837 str += sprintf(str, "PCR-%02d: ", i);
838 for (j = 0; j < TPM_DIGEST_SIZE; j++)
839 str += sprintf(str, "%02X ", digest[j]);
840 str += sprintf(str, "\n");
841 }
842 return str - buf;
843 }
844 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
845
846 #define READ_PUBEK_RESULT_SIZE 314
847 #define TPM_ORD_READPUBEK cpu_to_be32(124)
848 struct tpm_input_header tpm_readpubek_header = {
849 .tag = TPM_TAG_RQU_COMMAND,
850 .length = cpu_to_be32(30),
851 .ordinal = TPM_ORD_READPUBEK
852 };
853
854 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
855 char *buf)
856 {
857 u8 *data;
858 struct tpm_cmd_t tpm_cmd;
859 ssize_t err;
860 int i, rc;
861 char *str = buf;
862
863 struct tpm_chip *chip = dev_get_drvdata(dev);
864
865 tpm_cmd.header.in = tpm_readpubek_header;
866 err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
867 "attempting to read the PUBEK");
868 if (err)
869 goto out;
870
871 /*
872 ignore header 10 bytes
873 algorithm 32 bits (1 == RSA )
874 encscheme 16 bits
875 sigscheme 16 bits
876 parameters (RSA 12->bytes: keybit, #primes, expbit)
877 keylenbytes 32 bits
878 256 byte modulus
879 ignore checksum 20 bytes
880 */
881 data = tpm_cmd.params.readpubek_out_buffer;
882 str +=
883 sprintf(str,
884 "Algorithm: %02X %02X %02X %02X\n"
885 "Encscheme: %02X %02X\n"
886 "Sigscheme: %02X %02X\n"
887 "Parameters: %02X %02X %02X %02X "
888 "%02X %02X %02X %02X "
889 "%02X %02X %02X %02X\n"
890 "Modulus length: %d\n"
891 "Modulus:\n",
892 data[0], data[1], data[2], data[3],
893 data[4], data[5],
894 data[6], data[7],
895 data[12], data[13], data[14], data[15],
896 data[16], data[17], data[18], data[19],
897 data[20], data[21], data[22], data[23],
898 be32_to_cpu(*((__be32 *) (data + 24))));
899
900 for (i = 0; i < 256; i++) {
901 str += sprintf(str, "%02X ", data[i + 28]);
902 if ((i + 1) % 16 == 0)
903 str += sprintf(str, "\n");
904 }
905 out:
906 rc = str - buf;
907 return rc;
908 }
909 EXPORT_SYMBOL_GPL(tpm_show_pubek);
910
911
912 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
913 char *buf)
914 {
915 cap_t cap;
916 ssize_t rc;
917 char *str = buf;
918
919 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
920 "attempting to determine the manufacturer");
921 if (rc)
922 return 0;
923 str += sprintf(str, "Manufacturer: 0x%x\n",
924 be32_to_cpu(cap.manufacturer_id));
925
926 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
927 "attempting to determine the 1.1 version");
928 if (rc)
929 return 0;
930 str += sprintf(str,
931 "TCG version: %d.%d\nFirmware version: %d.%d\n",
932 cap.tpm_version.Major, cap.tpm_version.Minor,
933 cap.tpm_version.revMajor, cap.tpm_version.revMinor);
934 return str - buf;
935 }
936 EXPORT_SYMBOL_GPL(tpm_show_caps);
937
938 ssize_t tpm_show_caps_1_2(struct device * dev,
939 struct device_attribute * attr, char *buf)
940 {
941 cap_t cap;
942 ssize_t rc;
943 char *str = buf;
944
945 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
946 "attempting to determine the manufacturer");
947 if (rc)
948 return 0;
949 str += sprintf(str, "Manufacturer: 0x%x\n",
950 be32_to_cpu(cap.manufacturer_id));
951 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
952 "attempting to determine the 1.2 version");
953 if (rc)
954 return 0;
955 str += sprintf(str,
956 "TCG version: %d.%d\nFirmware version: %d.%d\n",
957 cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
958 cap.tpm_version_1_2.revMajor,
959 cap.tpm_version_1_2.revMinor);
960 return str - buf;
961 }
962 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
963
964 ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
965 char *buf)
966 {
967 struct tpm_chip *chip = dev_get_drvdata(dev);
968
969 if (chip->vendor.duration[TPM_LONG] == 0)
970 return 0;
971
972 return sprintf(buf, "%d %d %d [%s]\n",
973 jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
974 jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
975 jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
976 chip->vendor.duration_adjusted
977 ? "adjusted" : "original");
978 }
979 EXPORT_SYMBOL_GPL(tpm_show_durations);
980
981 ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
982 char *buf)
983 {
984 struct tpm_chip *chip = dev_get_drvdata(dev);
985
986 return sprintf(buf, "%d %d %d %d [%s]\n",
987 jiffies_to_usecs(chip->vendor.timeout_a),
988 jiffies_to_usecs(chip->vendor.timeout_b),
989 jiffies_to_usecs(chip->vendor.timeout_c),
990 jiffies_to_usecs(chip->vendor.timeout_d),
991 chip->vendor.timeout_adjusted
992 ? "adjusted" : "original");
993 }
994 EXPORT_SYMBOL_GPL(tpm_show_timeouts);
995
996 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
997 const char *buf, size_t count)
998 {
999 struct tpm_chip *chip = dev_get_drvdata(dev);
1000 if (chip == NULL)
1001 return 0;
1002
1003 chip->vendor.cancel(chip);
1004 return count;
1005 }
1006 EXPORT_SYMBOL_GPL(tpm_store_cancel);
1007
1008 /*
1009 * Device file system interface to the TPM
1010 *
1011 * It's assured that the chip will be opened just once,
1012 * by the check of is_open variable, which is protected
1013 * by driver_lock.
1014 */
1015 int tpm_open(struct inode *inode, struct file *file)
1016 {
1017 int minor = iminor(inode);
1018 struct tpm_chip *chip = NULL, *pos;
1019
1020 rcu_read_lock();
1021 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
1022 if (pos->vendor.miscdev.minor == minor) {
1023 chip = pos;
1024 get_device(chip->dev);
1025 break;
1026 }
1027 }
1028 rcu_read_unlock();
1029
1030 if (!chip)
1031 return -ENODEV;
1032
1033 if (test_and_set_bit(0, &chip->is_open)) {
1034 dev_dbg(chip->dev, "Another process owns this TPM\n");
1035 put_device(chip->dev);
1036 return -EBUSY;
1037 }
1038
1039 chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
1040 if (chip->data_buffer == NULL) {
1041 clear_bit(0, &chip->is_open);
1042 put_device(chip->dev);
1043 return -ENOMEM;
1044 }
1045
1046 atomic_set(&chip->data_pending, 0);
1047
1048 file->private_data = chip;
1049 return 0;
1050 }
1051 EXPORT_SYMBOL_GPL(tpm_open);
1052
1053 /*
1054 * Called on file close
1055 */
1056 int tpm_release(struct inode *inode, struct file *file)
1057 {
1058 struct tpm_chip *chip = file->private_data;
1059
1060 del_singleshot_timer_sync(&chip->user_read_timer);
1061 flush_work_sync(&chip->work);
1062 file->private_data = NULL;
1063 atomic_set(&chip->data_pending, 0);
1064 kfree(chip->data_buffer);
1065 clear_bit(0, &chip->is_open);
1066 put_device(chip->dev);
1067 return 0;
1068 }
1069 EXPORT_SYMBOL_GPL(tpm_release);
1070
1071 ssize_t tpm_write(struct file *file, const char __user *buf,
1072 size_t size, loff_t *off)
1073 {
1074 struct tpm_chip *chip = file->private_data;
1075 size_t in_size = size, out_size;
1076
1077 /* cannot perform a write until the read has cleared
1078 either via tpm_read or a user_read_timer timeout */
1079 while (atomic_read(&chip->data_pending) != 0)
1080 msleep(TPM_TIMEOUT);
1081
1082 mutex_lock(&chip->buffer_mutex);
1083
1084 if (in_size > TPM_BUFSIZE)
1085 in_size = TPM_BUFSIZE;
1086
1087 if (copy_from_user
1088 (chip->data_buffer, (void __user *) buf, in_size)) {
1089 mutex_unlock(&chip->buffer_mutex);
1090 return -EFAULT;
1091 }
1092
1093 /* atomic tpm command send and result receive */
1094 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1095
1096 atomic_set(&chip->data_pending, out_size);
1097 mutex_unlock(&chip->buffer_mutex);
1098
1099 /* Set a timeout by which the reader must come claim the result */
1100 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1101
1102 return in_size;
1103 }
1104 EXPORT_SYMBOL_GPL(tpm_write);
1105
1106 ssize_t tpm_read(struct file *file, char __user *buf,
1107 size_t size, loff_t *off)
1108 {
1109 struct tpm_chip *chip = file->private_data;
1110 ssize_t ret_size;
1111 int rc;
1112
1113 del_singleshot_timer_sync(&chip->user_read_timer);
1114 flush_work_sync(&chip->work);
1115 ret_size = atomic_read(&chip->data_pending);
1116 atomic_set(&chip->data_pending, 0);
1117 if (ret_size > 0) { /* relay data */
1118 if (size < ret_size)
1119 ret_size = size;
1120
1121 mutex_lock(&chip->buffer_mutex);
1122 rc = copy_to_user(buf, chip->data_buffer, ret_size);
1123 memset(chip->data_buffer, 0, ret_size);
1124 if (rc)
1125 ret_size = -EFAULT;
1126
1127 mutex_unlock(&chip->buffer_mutex);
1128 }
1129
1130 return ret_size;
1131 }
1132 EXPORT_SYMBOL_GPL(tpm_read);
1133
1134 void tpm_remove_hardware(struct device *dev)
1135 {
1136 struct tpm_chip *chip = dev_get_drvdata(dev);
1137
1138 if (chip == NULL) {
1139 dev_err(dev, "No device data found\n");
1140 return;
1141 }
1142
1143 spin_lock(&driver_lock);
1144 list_del_rcu(&chip->list);
1145 spin_unlock(&driver_lock);
1146 synchronize_rcu();
1147
1148 misc_deregister(&chip->vendor.miscdev);
1149 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1150 tpm_bios_log_teardown(chip->bios_dir);
1151
1152 /* write it this way to be explicit (chip->dev == dev) */
1153 put_device(chip->dev);
1154 }
1155 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1156
1157 #define TPM_ORD_SAVESTATE cpu_to_be32(152)
1158 #define SAVESTATE_RESULT_SIZE 10
1159
1160 static struct tpm_input_header savestate_header = {
1161 .tag = TPM_TAG_RQU_COMMAND,
1162 .length = cpu_to_be32(10),
1163 .ordinal = TPM_ORD_SAVESTATE
1164 };
1165
1166 /*
1167 * We are about to suspend. Save the TPM state
1168 * so that it can be restored.
1169 */
1170 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1171 {
1172 struct tpm_chip *chip = dev_get_drvdata(dev);
1173 struct tpm_cmd_t cmd;
1174 int rc;
1175
1176 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
1177
1178 if (chip == NULL)
1179 return -ENODEV;
1180
1181 /* for buggy tpm, flush pcrs with extend to selected dummy */
1182 if (tpm_suspend_pcr) {
1183 cmd.header.in = pcrextend_header;
1184 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1185 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1186 TPM_DIGEST_SIZE);
1187 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1188 "extending dummy pcr before suspend");
1189 }
1190
1191 /* now do the actual savestate */
1192 cmd.header.in = savestate_header;
1193 rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
1194 "sending savestate before suspend");
1195 return rc;
1196 }
1197 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1198
1199 /*
1200 * Resume from a power safe. The BIOS already restored
1201 * the TPM state.
1202 */
1203 int tpm_pm_resume(struct device *dev)
1204 {
1205 struct tpm_chip *chip = dev_get_drvdata(dev);
1206
1207 if (chip == NULL)
1208 return -ENODEV;
1209
1210 return 0;
1211 }
1212 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1213
1214 /* In case vendor provided release function, call it too.*/
1215
1216 void tpm_dev_vendor_release(struct tpm_chip *chip)
1217 {
1218 if (chip->vendor.release)
1219 chip->vendor.release(chip->dev);
1220
1221 clear_bit(chip->dev_num, dev_mask);
1222 kfree(chip->vendor.miscdev.name);
1223 }
1224 EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1225
1226
1227 /*
1228 * Once all references to platform device are down to 0,
1229 * release all allocated structures.
1230 */
1231 void tpm_dev_release(struct device *dev)
1232 {
1233 struct tpm_chip *chip = dev_get_drvdata(dev);
1234
1235 tpm_dev_vendor_release(chip);
1236
1237 chip->release(dev);
1238 kfree(chip);
1239 }
1240 EXPORT_SYMBOL_GPL(tpm_dev_release);
1241
1242 /*
1243 * Called from tpm_<specific>.c probe function only for devices
1244 * the driver has determined it should claim. Prior to calling
1245 * this function the specific probe function has called pci_enable_device
1246 * upon errant exit from this function specific probe function should call
1247 * pci_disable_device
1248 */
1249 struct tpm_chip *tpm_register_hardware(struct device *dev,
1250 const struct tpm_vendor_specific *entry)
1251 {
1252 #define DEVNAME_SIZE 7
1253
1254 char *devname;
1255 struct tpm_chip *chip;
1256
1257 /* Driver specific per-device data */
1258 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1259 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1260
1261 if (chip == NULL || devname == NULL)
1262 goto out_free;
1263
1264 mutex_init(&chip->buffer_mutex);
1265 mutex_init(&chip->tpm_mutex);
1266 INIT_LIST_HEAD(&chip->list);
1267
1268 INIT_WORK(&chip->work, timeout_work);
1269
1270 setup_timer(&chip->user_read_timer, user_reader_timeout,
1271 (unsigned long)chip);
1272
1273 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1274
1275 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1276
1277 if (chip->dev_num >= TPM_NUM_DEVICES) {
1278 dev_err(dev, "No available tpm device numbers\n");
1279 goto out_free;
1280 } else if (chip->dev_num == 0)
1281 chip->vendor.miscdev.minor = TPM_MINOR;
1282 else
1283 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1284
1285 set_bit(chip->dev_num, dev_mask);
1286
1287 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
1288 chip->vendor.miscdev.name = devname;
1289
1290 chip->vendor.miscdev.parent = dev;
1291 chip->dev = get_device(dev);
1292 chip->release = dev->release;
1293 dev->release = tpm_dev_release;
1294 dev_set_drvdata(dev, chip);
1295
1296 if (misc_register(&chip->vendor.miscdev)) {
1297 dev_err(chip->dev,
1298 "unable to misc_register %s, minor %d\n",
1299 chip->vendor.miscdev.name,
1300 chip->vendor.miscdev.minor);
1301 put_device(chip->dev);
1302 return NULL;
1303 }
1304
1305 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1306 misc_deregister(&chip->vendor.miscdev);
1307 put_device(chip->dev);
1308
1309 return NULL;
1310 }
1311
1312 chip->bios_dir = tpm_bios_log_setup(devname);
1313
1314 /* Make chip available */
1315 spin_lock(&driver_lock);
1316 list_add_rcu(&chip->list, &tpm_chip_list);
1317 spin_unlock(&driver_lock);
1318
1319 return chip;
1320
1321 out_free:
1322 kfree(chip);
1323 kfree(devname);
1324 return NULL;
1325 }
1326 EXPORT_SYMBOL_GPL(tpm_register_hardware);
1327
1328 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1329 MODULE_DESCRIPTION("TPM Driver");
1330 MODULE_VERSION("2.0");
1331 MODULE_LICENSE("GPL");