Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux-3.10.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         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");