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tpm: Introduce function to poll for result of self test
[deliverable/linux.git] / drivers / char / tpm / tpm.c
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 int 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 -EINVAL;
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 rc;
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 -EINVAL;
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 return 0;
611 }
612 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
613
614 #define TPM_ORD_CONTINUE_SELFTEST 83
615 #define CONTINUE_SELFTEST_RESULT_SIZE 10
616
617 static struct tpm_input_header continue_selftest_header = {
618 .tag = TPM_TAG_RQU_COMMAND,
619 .length = cpu_to_be32(10),
620 .ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
621 };
622
623 /**
624 * tpm_continue_selftest -- run TPM's selftest
625 * @chip: TPM chip to use
626 *
627 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
628 * a TPM error code.
629 */
630 static int tpm_continue_selftest(struct tpm_chip *chip)
631 {
632 int rc;
633 struct tpm_cmd_t cmd;
634
635 cmd.header.in = continue_selftest_header;
636 rc = transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
637 "continue selftest");
638 return rc;
639 }
640
641 ssize_t tpm_show_enabled(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 enabled state");
649 if (rc)
650 return 0;
651
652 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
653 return rc;
654 }
655 EXPORT_SYMBOL_GPL(tpm_show_enabled);
656
657 ssize_t tpm_show_active(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_FLAG_PERM, &cap,
664 "attempting to determine the permanent active state");
665 if (rc)
666 return 0;
667
668 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
669 return rc;
670 }
671 EXPORT_SYMBOL_GPL(tpm_show_active);
672
673 ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
674 char *buf)
675 {
676 cap_t cap;
677 ssize_t rc;
678
679 rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
680 "attempting to determine the owner state");
681 if (rc)
682 return 0;
683
684 rc = sprintf(buf, "%d\n", cap.owned);
685 return rc;
686 }
687 EXPORT_SYMBOL_GPL(tpm_show_owned);
688
689 ssize_t tpm_show_temp_deactivated(struct device * dev,
690 struct device_attribute * attr, char *buf)
691 {
692 cap_t cap;
693 ssize_t rc;
694
695 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
696 "attempting to determine the temporary state");
697 if (rc)
698 return 0;
699
700 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
701 return rc;
702 }
703 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
704
705 /*
706 * tpm_chip_find_get - return tpm_chip for given chip number
707 */
708 static struct tpm_chip *tpm_chip_find_get(int chip_num)
709 {
710 struct tpm_chip *pos, *chip = NULL;
711
712 rcu_read_lock();
713 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
714 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
715 continue;
716
717 if (try_module_get(pos->dev->driver->owner)) {
718 chip = pos;
719 break;
720 }
721 }
722 rcu_read_unlock();
723 return chip;
724 }
725
726 #define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
727 #define READ_PCR_RESULT_SIZE 30
728 static struct tpm_input_header pcrread_header = {
729 .tag = TPM_TAG_RQU_COMMAND,
730 .length = cpu_to_be32(14),
731 .ordinal = TPM_ORDINAL_PCRREAD
732 };
733
734 static int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
735 {
736 int rc;
737 struct tpm_cmd_t cmd;
738
739 cmd.header.in = pcrread_header;
740 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
741 rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
742 "attempting to read a pcr value");
743
744 if (rc == 0)
745 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
746 TPM_DIGEST_SIZE);
747 return rc;
748 }
749
750 /**
751 * tpm_pcr_read - read a pcr value
752 * @chip_num: tpm idx # or ANY
753 * @pcr_idx: pcr idx to retrieve
754 * @res_buf: TPM_PCR value
755 * size of res_buf is 20 bytes (or NULL if you don't care)
756 *
757 * The TPM driver should be built-in, but for whatever reason it
758 * isn't, protect against the chip disappearing, by incrementing
759 * the module usage count.
760 */
761 int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
762 {
763 struct tpm_chip *chip;
764 int rc;
765
766 chip = tpm_chip_find_get(chip_num);
767 if (chip == NULL)
768 return -ENODEV;
769 rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
770 tpm_chip_put(chip);
771 return rc;
772 }
773 EXPORT_SYMBOL_GPL(tpm_pcr_read);
774
775 /**
776 * tpm_pcr_extend - extend pcr value with hash
777 * @chip_num: tpm idx # or AN&
778 * @pcr_idx: pcr idx to extend
779 * @hash: hash value used to extend pcr value
780 *
781 * The TPM driver should be built-in, but for whatever reason it
782 * isn't, protect against the chip disappearing, by incrementing
783 * the module usage count.
784 */
785 #define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
786 #define EXTEND_PCR_RESULT_SIZE 34
787 static struct tpm_input_header pcrextend_header = {
788 .tag = TPM_TAG_RQU_COMMAND,
789 .length = cpu_to_be32(34),
790 .ordinal = TPM_ORD_PCR_EXTEND
791 };
792
793 int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
794 {
795 struct tpm_cmd_t cmd;
796 int rc;
797 struct tpm_chip *chip;
798
799 chip = tpm_chip_find_get(chip_num);
800 if (chip == NULL)
801 return -ENODEV;
802
803 cmd.header.in = pcrextend_header;
804 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
805 memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
806 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
807 "attempting extend a PCR value");
808
809 tpm_chip_put(chip);
810 return rc;
811 }
812 EXPORT_SYMBOL_GPL(tpm_pcr_extend);
813
814 /**
815 * tpm_do_selftest - have the TPM continue its selftest and wait until it
816 * can receive further commands
817 * @chip: TPM chip to use
818 *
819 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
820 * a TPM error code.
821 */
822 int tpm_do_selftest(struct tpm_chip *chip)
823 {
824 int rc;
825 u8 digest[TPM_DIGEST_SIZE];
826 unsigned int loops;
827 unsigned int delay_msec = 1000;
828 unsigned long duration;
829
830 duration = tpm_calc_ordinal_duration(chip,
831 TPM_ORD_CONTINUE_SELFTEST);
832
833 loops = jiffies_to_msecs(duration) / delay_msec;
834
835 rc = tpm_continue_selftest(chip);
836 /* This may fail if there was no TPM driver during a suspend/resume
837 * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST)
838 */
839 if (rc)
840 return rc;
841
842 do {
843 rc = __tpm_pcr_read(chip, 0, digest);
844 if (rc != TPM_WARN_DOING_SELFTEST)
845 return rc;
846 msleep(delay_msec);
847 } while (--loops > 0);
848
849 return rc;
850 }
851 EXPORT_SYMBOL_GPL(tpm_do_selftest);
852
853 int tpm_send(u32 chip_num, void *cmd, size_t buflen)
854 {
855 struct tpm_chip *chip;
856 int rc;
857
858 chip = tpm_chip_find_get(chip_num);
859 if (chip == NULL)
860 return -ENODEV;
861
862 rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
863
864 tpm_chip_put(chip);
865 return rc;
866 }
867 EXPORT_SYMBOL_GPL(tpm_send);
868
869 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
870 char *buf)
871 {
872 cap_t cap;
873 u8 digest[TPM_DIGEST_SIZE];
874 ssize_t rc;
875 int i, j, num_pcrs;
876 char *str = buf;
877 struct tpm_chip *chip = dev_get_drvdata(dev);
878
879 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
880 "attempting to determine the number of PCRS");
881 if (rc)
882 return 0;
883
884 num_pcrs = be32_to_cpu(cap.num_pcrs);
885 for (i = 0; i < num_pcrs; i++) {
886 rc = __tpm_pcr_read(chip, i, digest);
887 if (rc)
888 break;
889 str += sprintf(str, "PCR-%02d: ", i);
890 for (j = 0; j < TPM_DIGEST_SIZE; j++)
891 str += sprintf(str, "%02X ", digest[j]);
892 str += sprintf(str, "\n");
893 }
894 return str - buf;
895 }
896 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
897
898 #define READ_PUBEK_RESULT_SIZE 314
899 #define TPM_ORD_READPUBEK cpu_to_be32(124)
900 struct tpm_input_header tpm_readpubek_header = {
901 .tag = TPM_TAG_RQU_COMMAND,
902 .length = cpu_to_be32(30),
903 .ordinal = TPM_ORD_READPUBEK
904 };
905
906 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
907 char *buf)
908 {
909 u8 *data;
910 struct tpm_cmd_t tpm_cmd;
911 ssize_t err;
912 int i, rc;
913 char *str = buf;
914
915 struct tpm_chip *chip = dev_get_drvdata(dev);
916
917 tpm_cmd.header.in = tpm_readpubek_header;
918 err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
919 "attempting to read the PUBEK");
920 if (err)
921 goto out;
922
923 /*
924 ignore header 10 bytes
925 algorithm 32 bits (1 == RSA )
926 encscheme 16 bits
927 sigscheme 16 bits
928 parameters (RSA 12->bytes: keybit, #primes, expbit)
929 keylenbytes 32 bits
930 256 byte modulus
931 ignore checksum 20 bytes
932 */
933 data = tpm_cmd.params.readpubek_out_buffer;
934 str +=
935 sprintf(str,
936 "Algorithm: %02X %02X %02X %02X\n"
937 "Encscheme: %02X %02X\n"
938 "Sigscheme: %02X %02X\n"
939 "Parameters: %02X %02X %02X %02X "
940 "%02X %02X %02X %02X "
941 "%02X %02X %02X %02X\n"
942 "Modulus length: %d\n"
943 "Modulus:\n",
944 data[0], data[1], data[2], data[3],
945 data[4], data[5],
946 data[6], data[7],
947 data[12], data[13], data[14], data[15],
948 data[16], data[17], data[18], data[19],
949 data[20], data[21], data[22], data[23],
950 be32_to_cpu(*((__be32 *) (data + 24))));
951
952 for (i = 0; i < 256; i++) {
953 str += sprintf(str, "%02X ", data[i + 28]);
954 if ((i + 1) % 16 == 0)
955 str += sprintf(str, "\n");
956 }
957 out:
958 rc = str - buf;
959 return rc;
960 }
961 EXPORT_SYMBOL_GPL(tpm_show_pubek);
962
963
964 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
965 char *buf)
966 {
967 cap_t cap;
968 ssize_t rc;
969 char *str = buf;
970
971 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
972 "attempting to determine the manufacturer");
973 if (rc)
974 return 0;
975 str += sprintf(str, "Manufacturer: 0x%x\n",
976 be32_to_cpu(cap.manufacturer_id));
977
978 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
979 "attempting to determine the 1.1 version");
980 if (rc)
981 return 0;
982 str += sprintf(str,
983 "TCG version: %d.%d\nFirmware version: %d.%d\n",
984 cap.tpm_version.Major, cap.tpm_version.Minor,
985 cap.tpm_version.revMajor, cap.tpm_version.revMinor);
986 return str - buf;
987 }
988 EXPORT_SYMBOL_GPL(tpm_show_caps);
989
990 ssize_t tpm_show_caps_1_2(struct device * dev,
991 struct device_attribute * attr, char *buf)
992 {
993 cap_t cap;
994 ssize_t rc;
995 char *str = buf;
996
997 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
998 "attempting to determine the manufacturer");
999 if (rc)
1000 return 0;
1001 str += sprintf(str, "Manufacturer: 0x%x\n",
1002 be32_to_cpu(cap.manufacturer_id));
1003 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
1004 "attempting to determine the 1.2 version");
1005 if (rc)
1006 return 0;
1007 str += sprintf(str,
1008 "TCG version: %d.%d\nFirmware version: %d.%d\n",
1009 cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
1010 cap.tpm_version_1_2.revMajor,
1011 cap.tpm_version_1_2.revMinor);
1012 return str - buf;
1013 }
1014 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
1015
1016 ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
1017 char *buf)
1018 {
1019 struct tpm_chip *chip = dev_get_drvdata(dev);
1020
1021 if (chip->vendor.duration[TPM_LONG] == 0)
1022 return 0;
1023
1024 return sprintf(buf, "%d %d %d [%s]\n",
1025 jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
1026 jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
1027 jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
1028 chip->vendor.duration_adjusted
1029 ? "adjusted" : "original");
1030 }
1031 EXPORT_SYMBOL_GPL(tpm_show_durations);
1032
1033 ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
1034 char *buf)
1035 {
1036 struct tpm_chip *chip = dev_get_drvdata(dev);
1037
1038 return sprintf(buf, "%d %d %d %d [%s]\n",
1039 jiffies_to_usecs(chip->vendor.timeout_a),
1040 jiffies_to_usecs(chip->vendor.timeout_b),
1041 jiffies_to_usecs(chip->vendor.timeout_c),
1042 jiffies_to_usecs(chip->vendor.timeout_d),
1043 chip->vendor.timeout_adjusted
1044 ? "adjusted" : "original");
1045 }
1046 EXPORT_SYMBOL_GPL(tpm_show_timeouts);
1047
1048 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
1049 const char *buf, size_t count)
1050 {
1051 struct tpm_chip *chip = dev_get_drvdata(dev);
1052 if (chip == NULL)
1053 return 0;
1054
1055 chip->vendor.cancel(chip);
1056 return count;
1057 }
1058 EXPORT_SYMBOL_GPL(tpm_store_cancel);
1059
1060 /*
1061 * Device file system interface to the TPM
1062 *
1063 * It's assured that the chip will be opened just once,
1064 * by the check of is_open variable, which is protected
1065 * by driver_lock.
1066 */
1067 int tpm_open(struct inode *inode, struct file *file)
1068 {
1069 int minor = iminor(inode);
1070 struct tpm_chip *chip = NULL, *pos;
1071
1072 rcu_read_lock();
1073 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
1074 if (pos->vendor.miscdev.minor == minor) {
1075 chip = pos;
1076 get_device(chip->dev);
1077 break;
1078 }
1079 }
1080 rcu_read_unlock();
1081
1082 if (!chip)
1083 return -ENODEV;
1084
1085 if (test_and_set_bit(0, &chip->is_open)) {
1086 dev_dbg(chip->dev, "Another process owns this TPM\n");
1087 put_device(chip->dev);
1088 return -EBUSY;
1089 }
1090
1091 chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
1092 if (chip->data_buffer == NULL) {
1093 clear_bit(0, &chip->is_open);
1094 put_device(chip->dev);
1095 return -ENOMEM;
1096 }
1097
1098 atomic_set(&chip->data_pending, 0);
1099
1100 file->private_data = chip;
1101 return 0;
1102 }
1103 EXPORT_SYMBOL_GPL(tpm_open);
1104
1105 /*
1106 * Called on file close
1107 */
1108 int tpm_release(struct inode *inode, struct file *file)
1109 {
1110 struct tpm_chip *chip = file->private_data;
1111
1112 del_singleshot_timer_sync(&chip->user_read_timer);
1113 flush_work_sync(&chip->work);
1114 file->private_data = NULL;
1115 atomic_set(&chip->data_pending, 0);
1116 kfree(chip->data_buffer);
1117 clear_bit(0, &chip->is_open);
1118 put_device(chip->dev);
1119 return 0;
1120 }
1121 EXPORT_SYMBOL_GPL(tpm_release);
1122
1123 ssize_t tpm_write(struct file *file, const char __user *buf,
1124 size_t size, loff_t *off)
1125 {
1126 struct tpm_chip *chip = file->private_data;
1127 size_t in_size = size, out_size;
1128
1129 /* cannot perform a write until the read has cleared
1130 either via tpm_read or a user_read_timer timeout */
1131 while (atomic_read(&chip->data_pending) != 0)
1132 msleep(TPM_TIMEOUT);
1133
1134 mutex_lock(&chip->buffer_mutex);
1135
1136 if (in_size > TPM_BUFSIZE)
1137 in_size = TPM_BUFSIZE;
1138
1139 if (copy_from_user
1140 (chip->data_buffer, (void __user *) buf, in_size)) {
1141 mutex_unlock(&chip->buffer_mutex);
1142 return -EFAULT;
1143 }
1144
1145 /* atomic tpm command send and result receive */
1146 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1147
1148 atomic_set(&chip->data_pending, out_size);
1149 mutex_unlock(&chip->buffer_mutex);
1150
1151 /* Set a timeout by which the reader must come claim the result */
1152 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1153
1154 return in_size;
1155 }
1156 EXPORT_SYMBOL_GPL(tpm_write);
1157
1158 ssize_t tpm_read(struct file *file, char __user *buf,
1159 size_t size, loff_t *off)
1160 {
1161 struct tpm_chip *chip = file->private_data;
1162 ssize_t ret_size;
1163
1164 del_singleshot_timer_sync(&chip->user_read_timer);
1165 flush_work_sync(&chip->work);
1166 ret_size = atomic_read(&chip->data_pending);
1167 atomic_set(&chip->data_pending, 0);
1168 if (ret_size > 0) { /* relay data */
1169 if (size < ret_size)
1170 ret_size = size;
1171
1172 mutex_lock(&chip->buffer_mutex);
1173 if (copy_to_user(buf, chip->data_buffer, ret_size))
1174 ret_size = -EFAULT;
1175 mutex_unlock(&chip->buffer_mutex);
1176 }
1177
1178 return ret_size;
1179 }
1180 EXPORT_SYMBOL_GPL(tpm_read);
1181
1182 void tpm_remove_hardware(struct device *dev)
1183 {
1184 struct tpm_chip *chip = dev_get_drvdata(dev);
1185
1186 if (chip == NULL) {
1187 dev_err(dev, "No device data found\n");
1188 return;
1189 }
1190
1191 spin_lock(&driver_lock);
1192 list_del_rcu(&chip->list);
1193 spin_unlock(&driver_lock);
1194 synchronize_rcu();
1195
1196 misc_deregister(&chip->vendor.miscdev);
1197 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1198 tpm_bios_log_teardown(chip->bios_dir);
1199
1200 /* write it this way to be explicit (chip->dev == dev) */
1201 put_device(chip->dev);
1202 }
1203 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1204
1205 #define TPM_ORD_SAVESTATE cpu_to_be32(152)
1206 #define SAVESTATE_RESULT_SIZE 10
1207
1208 static struct tpm_input_header savestate_header = {
1209 .tag = TPM_TAG_RQU_COMMAND,
1210 .length = cpu_to_be32(10),
1211 .ordinal = TPM_ORD_SAVESTATE
1212 };
1213
1214 /*
1215 * We are about to suspend. Save the TPM state
1216 * so that it can be restored.
1217 */
1218 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1219 {
1220 struct tpm_chip *chip = dev_get_drvdata(dev);
1221 struct tpm_cmd_t cmd;
1222 int rc;
1223
1224 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
1225
1226 if (chip == NULL)
1227 return -ENODEV;
1228
1229 /* for buggy tpm, flush pcrs with extend to selected dummy */
1230 if (tpm_suspend_pcr) {
1231 cmd.header.in = pcrextend_header;
1232 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1233 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1234 TPM_DIGEST_SIZE);
1235 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1236 "extending dummy pcr before suspend");
1237 }
1238
1239 /* now do the actual savestate */
1240 cmd.header.in = savestate_header;
1241 rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
1242 "sending savestate before suspend");
1243 return rc;
1244 }
1245 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1246
1247 /*
1248 * Resume from a power safe. The BIOS already restored
1249 * the TPM state.
1250 */
1251 int tpm_pm_resume(struct device *dev)
1252 {
1253 struct tpm_chip *chip = dev_get_drvdata(dev);
1254
1255 if (chip == NULL)
1256 return -ENODEV;
1257
1258 return 0;
1259 }
1260 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1261
1262 /* In case vendor provided release function, call it too.*/
1263
1264 void tpm_dev_vendor_release(struct tpm_chip *chip)
1265 {
1266 if (chip->vendor.release)
1267 chip->vendor.release(chip->dev);
1268
1269 clear_bit(chip->dev_num, dev_mask);
1270 kfree(chip->vendor.miscdev.name);
1271 }
1272 EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1273
1274
1275 /*
1276 * Once all references to platform device are down to 0,
1277 * release all allocated structures.
1278 */
1279 void tpm_dev_release(struct device *dev)
1280 {
1281 struct tpm_chip *chip = dev_get_drvdata(dev);
1282
1283 tpm_dev_vendor_release(chip);
1284
1285 chip->release(dev);
1286 kfree(chip);
1287 }
1288 EXPORT_SYMBOL_GPL(tpm_dev_release);
1289
1290 /*
1291 * Called from tpm_<specific>.c probe function only for devices
1292 * the driver has determined it should claim. Prior to calling
1293 * this function the specific probe function has called pci_enable_device
1294 * upon errant exit from this function specific probe function should call
1295 * pci_disable_device
1296 */
1297 struct tpm_chip *tpm_register_hardware(struct device *dev,
1298 const struct tpm_vendor_specific *entry)
1299 {
1300 #define DEVNAME_SIZE 7
1301
1302 char *devname;
1303 struct tpm_chip *chip;
1304
1305 /* Driver specific per-device data */
1306 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1307 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1308
1309 if (chip == NULL || devname == NULL)
1310 goto out_free;
1311
1312 mutex_init(&chip->buffer_mutex);
1313 mutex_init(&chip->tpm_mutex);
1314 INIT_LIST_HEAD(&chip->list);
1315
1316 INIT_WORK(&chip->work, timeout_work);
1317
1318 setup_timer(&chip->user_read_timer, user_reader_timeout,
1319 (unsigned long)chip);
1320
1321 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1322
1323 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1324
1325 if (chip->dev_num >= TPM_NUM_DEVICES) {
1326 dev_err(dev, "No available tpm device numbers\n");
1327 goto out_free;
1328 } else if (chip->dev_num == 0)
1329 chip->vendor.miscdev.minor = TPM_MINOR;
1330 else
1331 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1332
1333 set_bit(chip->dev_num, dev_mask);
1334
1335 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
1336 chip->vendor.miscdev.name = devname;
1337
1338 chip->vendor.miscdev.parent = dev;
1339 chip->dev = get_device(dev);
1340 chip->release = dev->release;
1341 dev->release = tpm_dev_release;
1342 dev_set_drvdata(dev, chip);
1343
1344 if (misc_register(&chip->vendor.miscdev)) {
1345 dev_err(chip->dev,
1346 "unable to misc_register %s, minor %d\n",
1347 chip->vendor.miscdev.name,
1348 chip->vendor.miscdev.minor);
1349 put_device(chip->dev);
1350 return NULL;
1351 }
1352
1353 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1354 misc_deregister(&chip->vendor.miscdev);
1355 put_device(chip->dev);
1356
1357 return NULL;
1358 }
1359
1360 chip->bios_dir = tpm_bios_log_setup(devname);
1361
1362 /* Make chip available */
1363 spin_lock(&driver_lock);
1364 list_add_rcu(&chip->list, &tpm_chip_list);
1365 spin_unlock(&driver_lock);
1366
1367 return chip;
1368
1369 out_free:
1370 kfree(chip);
1371 kfree(devname);
1372 return NULL;
1373 }
1374 EXPORT_SYMBOL_GPL(tpm_register_hardware);
1375
1376 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1377 MODULE_DESCRIPTION("TPM Driver");
1378 MODULE_VERSION("2.0");
1379 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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