tpm: fix (ACPI S3) suspend regression
[linux-2.6.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 #include <linux/freezer.h>
31
32 #include "tpm.h"
33
34 enum tpm_const {
35         TPM_MINOR = 224,        /* officially assigned */
36         TPM_BUFSIZE = 4096,
37         TPM_NUM_DEVICES = 256,
38 };
39
40 enum tpm_duration {
41         TPM_SHORT = 0,
42         TPM_MEDIUM = 1,
43         TPM_LONG = 2,
44         TPM_UNDEFINED,
45 };
46
47 #define TPM_MAX_ORDINAL 243
48 #define TPM_MAX_PROTECTED_ORDINAL 12
49 #define TPM_PROTECTED_ORDINAL_MASK 0xFF
50
51 /*
52  * Bug workaround - some TPM's don't flush the most
53  * recently changed pcr on suspend, so force the flush
54  * with an extend to the selected _unused_ non-volatile pcr.
55  */
56 static int tpm_suspend_pcr;
57 module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
58 MODULE_PARM_DESC(suspend_pcr,
59                  "PCR to use for dummy writes to faciltate flush on suspend.");
60
61 static LIST_HEAD(tpm_chip_list);
62 static DEFINE_SPINLOCK(driver_lock);
63 static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
64
65 /*
66  * Array with one entry per ordinal defining the maximum amount
67  * of time the chip could take to return the result.  The ordinal
68  * designation of short, medium or long is defined in a table in
69  * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
70  * values of the SHORT, MEDIUM, and LONG durations are retrieved
71  * from the chip during initialization with a call to tpm_get_timeouts.
72  */
73 static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
74         TPM_UNDEFINED,          /* 0 */
75         TPM_UNDEFINED,
76         TPM_UNDEFINED,
77         TPM_UNDEFINED,
78         TPM_UNDEFINED,
79         TPM_UNDEFINED,          /* 5 */
80         TPM_UNDEFINED,
81         TPM_UNDEFINED,
82         TPM_UNDEFINED,
83         TPM_UNDEFINED,
84         TPM_SHORT,              /* 10 */
85         TPM_SHORT,
86 };
87
88 static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
89         TPM_UNDEFINED,          /* 0 */
90         TPM_UNDEFINED,
91         TPM_UNDEFINED,
92         TPM_UNDEFINED,
93         TPM_UNDEFINED,
94         TPM_UNDEFINED,          /* 5 */
95         TPM_UNDEFINED,
96         TPM_UNDEFINED,
97         TPM_UNDEFINED,
98         TPM_UNDEFINED,
99         TPM_SHORT,              /* 10 */
100         TPM_SHORT,
101         TPM_MEDIUM,
102         TPM_LONG,
103         TPM_LONG,
104         TPM_MEDIUM,             /* 15 */
105         TPM_SHORT,
106         TPM_SHORT,
107         TPM_MEDIUM,
108         TPM_LONG,
109         TPM_SHORT,              /* 20 */
110         TPM_SHORT,
111         TPM_MEDIUM,
112         TPM_MEDIUM,
113         TPM_MEDIUM,
114         TPM_SHORT,              /* 25 */
115         TPM_SHORT,
116         TPM_MEDIUM,
117         TPM_SHORT,
118         TPM_SHORT,
119         TPM_MEDIUM,             /* 30 */
120         TPM_LONG,
121         TPM_MEDIUM,
122         TPM_SHORT,
123         TPM_SHORT,
124         TPM_SHORT,              /* 35 */
125         TPM_MEDIUM,
126         TPM_MEDIUM,
127         TPM_UNDEFINED,
128         TPM_UNDEFINED,
129         TPM_MEDIUM,             /* 40 */
130         TPM_LONG,
131         TPM_MEDIUM,
132         TPM_SHORT,
133         TPM_SHORT,
134         TPM_SHORT,              /* 45 */
135         TPM_SHORT,
136         TPM_SHORT,
137         TPM_SHORT,
138         TPM_LONG,
139         TPM_MEDIUM,             /* 50 */
140         TPM_MEDIUM,
141         TPM_UNDEFINED,
142         TPM_UNDEFINED,
143         TPM_UNDEFINED,
144         TPM_UNDEFINED,          /* 55 */
145         TPM_UNDEFINED,
146         TPM_UNDEFINED,
147         TPM_UNDEFINED,
148         TPM_UNDEFINED,
149         TPM_MEDIUM,             /* 60 */
150         TPM_MEDIUM,
151         TPM_MEDIUM,
152         TPM_SHORT,
153         TPM_SHORT,
154         TPM_MEDIUM,             /* 65 */
155         TPM_UNDEFINED,
156         TPM_UNDEFINED,
157         TPM_UNDEFINED,
158         TPM_UNDEFINED,
159         TPM_SHORT,              /* 70 */
160         TPM_SHORT,
161         TPM_UNDEFINED,
162         TPM_UNDEFINED,
163         TPM_UNDEFINED,
164         TPM_UNDEFINED,          /* 75 */
165         TPM_UNDEFINED,
166         TPM_UNDEFINED,
167         TPM_UNDEFINED,
168         TPM_UNDEFINED,
169         TPM_LONG,               /* 80 */
170         TPM_UNDEFINED,
171         TPM_MEDIUM,
172         TPM_LONG,
173         TPM_SHORT,
174         TPM_UNDEFINED,          /* 85 */
175         TPM_UNDEFINED,
176         TPM_UNDEFINED,
177         TPM_UNDEFINED,
178         TPM_UNDEFINED,
179         TPM_SHORT,              /* 90 */
180         TPM_SHORT,
181         TPM_SHORT,
182         TPM_SHORT,
183         TPM_SHORT,
184         TPM_UNDEFINED,          /* 95 */
185         TPM_UNDEFINED,
186         TPM_UNDEFINED,
187         TPM_UNDEFINED,
188         TPM_UNDEFINED,
189         TPM_MEDIUM,             /* 100 */
190         TPM_SHORT,
191         TPM_SHORT,
192         TPM_UNDEFINED,
193         TPM_UNDEFINED,
194         TPM_UNDEFINED,          /* 105 */
195         TPM_UNDEFINED,
196         TPM_UNDEFINED,
197         TPM_UNDEFINED,
198         TPM_UNDEFINED,
199         TPM_SHORT,              /* 110 */
200         TPM_SHORT,
201         TPM_SHORT,
202         TPM_SHORT,
203         TPM_SHORT,
204         TPM_SHORT,              /* 115 */
205         TPM_SHORT,
206         TPM_SHORT,
207         TPM_UNDEFINED,
208         TPM_UNDEFINED,
209         TPM_LONG,               /* 120 */
210         TPM_LONG,
211         TPM_MEDIUM,
212         TPM_UNDEFINED,
213         TPM_SHORT,
214         TPM_SHORT,              /* 125 */
215         TPM_SHORT,
216         TPM_LONG,
217         TPM_SHORT,
218         TPM_SHORT,
219         TPM_SHORT,              /* 130 */
220         TPM_MEDIUM,
221         TPM_UNDEFINED,
222         TPM_SHORT,
223         TPM_MEDIUM,
224         TPM_UNDEFINED,          /* 135 */
225         TPM_UNDEFINED,
226         TPM_UNDEFINED,
227         TPM_UNDEFINED,
228         TPM_UNDEFINED,
229         TPM_SHORT,              /* 140 */
230         TPM_SHORT,
231         TPM_UNDEFINED,
232         TPM_UNDEFINED,
233         TPM_UNDEFINED,
234         TPM_UNDEFINED,          /* 145 */
235         TPM_UNDEFINED,
236         TPM_UNDEFINED,
237         TPM_UNDEFINED,
238         TPM_UNDEFINED,
239         TPM_SHORT,              /* 150 */
240         TPM_MEDIUM,
241         TPM_MEDIUM,
242         TPM_SHORT,
243         TPM_SHORT,
244         TPM_UNDEFINED,          /* 155 */
245         TPM_UNDEFINED,
246         TPM_UNDEFINED,
247         TPM_UNDEFINED,
248         TPM_UNDEFINED,
249         TPM_SHORT,              /* 160 */
250         TPM_SHORT,
251         TPM_SHORT,
252         TPM_SHORT,
253         TPM_UNDEFINED,
254         TPM_UNDEFINED,          /* 165 */
255         TPM_UNDEFINED,
256         TPM_UNDEFINED,
257         TPM_UNDEFINED,
258         TPM_UNDEFINED,
259         TPM_LONG,               /* 170 */
260         TPM_UNDEFINED,
261         TPM_UNDEFINED,
262         TPM_UNDEFINED,
263         TPM_UNDEFINED,
264         TPM_UNDEFINED,          /* 175 */
265         TPM_UNDEFINED,
266         TPM_UNDEFINED,
267         TPM_UNDEFINED,
268         TPM_UNDEFINED,
269         TPM_MEDIUM,             /* 180 */
270         TPM_SHORT,
271         TPM_MEDIUM,
272         TPM_MEDIUM,
273         TPM_MEDIUM,
274         TPM_MEDIUM,             /* 185 */
275         TPM_SHORT,
276         TPM_UNDEFINED,
277         TPM_UNDEFINED,
278         TPM_UNDEFINED,
279         TPM_UNDEFINED,          /* 190 */
280         TPM_UNDEFINED,
281         TPM_UNDEFINED,
282         TPM_UNDEFINED,
283         TPM_UNDEFINED,
284         TPM_UNDEFINED,          /* 195 */
285         TPM_UNDEFINED,
286         TPM_UNDEFINED,
287         TPM_UNDEFINED,
288         TPM_UNDEFINED,
289         TPM_SHORT,              /* 200 */
290         TPM_UNDEFINED,
291         TPM_UNDEFINED,
292         TPM_UNDEFINED,
293         TPM_SHORT,
294         TPM_SHORT,              /* 205 */
295         TPM_SHORT,
296         TPM_SHORT,
297         TPM_SHORT,
298         TPM_SHORT,
299         TPM_MEDIUM,             /* 210 */
300         TPM_UNDEFINED,
301         TPM_MEDIUM,
302         TPM_MEDIUM,
303         TPM_MEDIUM,
304         TPM_UNDEFINED,          /* 215 */
305         TPM_MEDIUM,
306         TPM_UNDEFINED,
307         TPM_UNDEFINED,
308         TPM_SHORT,
309         TPM_SHORT,              /* 220 */
310         TPM_SHORT,
311         TPM_SHORT,
312         TPM_SHORT,
313         TPM_SHORT,
314         TPM_UNDEFINED,          /* 225 */
315         TPM_UNDEFINED,
316         TPM_UNDEFINED,
317         TPM_UNDEFINED,
318         TPM_UNDEFINED,
319         TPM_SHORT,              /* 230 */
320         TPM_LONG,
321         TPM_MEDIUM,
322         TPM_UNDEFINED,
323         TPM_UNDEFINED,
324         TPM_UNDEFINED,          /* 235 */
325         TPM_UNDEFINED,
326         TPM_UNDEFINED,
327         TPM_UNDEFINED,
328         TPM_UNDEFINED,
329         TPM_SHORT,              /* 240 */
330         TPM_UNDEFINED,
331         TPM_MEDIUM,
332 };
333
334 static void user_reader_timeout(unsigned long ptr)
335 {
336         struct tpm_chip *chip = (struct tpm_chip *) ptr;
337
338         schedule_work(&chip->work);
339 }
340
341 static void timeout_work(struct work_struct *work)
342 {
343         struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
344
345         mutex_lock(&chip->buffer_mutex);
346         atomic_set(&chip->data_pending, 0);
347         memset(chip->data_buffer, 0, TPM_BUFSIZE);
348         mutex_unlock(&chip->buffer_mutex);
349 }
350
351 /*
352  * Returns max number of jiffies to wait
353  */
354 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
355                                            u32 ordinal)
356 {
357         int duration_idx = TPM_UNDEFINED;
358         int duration = 0;
359
360         if (ordinal < TPM_MAX_ORDINAL)
361                 duration_idx = tpm_ordinal_duration[ordinal];
362         else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
363                  TPM_MAX_PROTECTED_ORDINAL)
364                 duration_idx =
365                     tpm_protected_ordinal_duration[ordinal &
366                                                    TPM_PROTECTED_ORDINAL_MASK];
367
368         if (duration_idx != TPM_UNDEFINED)
369                 duration = chip->vendor.duration[duration_idx];
370         if (duration <= 0)
371                 return 2 * 60 * HZ;
372         else
373                 return duration;
374 }
375 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
376
377 /*
378  * Internal kernel interface to transmit TPM commands
379  */
380 static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
381                             size_t bufsiz)
382 {
383         ssize_t rc;
384         u32 count, ordinal;
385         unsigned long stop;
386
387         if (bufsiz > TPM_BUFSIZE)
388                 bufsiz = TPM_BUFSIZE;
389
390         count = be32_to_cpu(*((__be32 *) (buf + 2)));
391         ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
392         if (count == 0)
393                 return -ENODATA;
394         if (count > bufsiz) {
395                 dev_err(chip->dev,
396                         "invalid count value %x %zx \n", count, bufsiz);
397                 return -E2BIG;
398         }
399
400         mutex_lock(&chip->tpm_mutex);
401
402         if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
403                 dev_err(chip->dev,
404                         "tpm_transmit: tpm_send: error %zd\n", rc);
405                 goto out;
406         }
407
408         if (chip->vendor.irq)
409                 goto out_recv;
410
411         stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
412         do {
413                 u8 status = chip->vendor.status(chip);
414                 if ((status & chip->vendor.req_complete_mask) ==
415                     chip->vendor.req_complete_val)
416                         goto out_recv;
417
418                 if ((status == chip->vendor.req_canceled)) {
419                         dev_err(chip->dev, "Operation Canceled\n");
420                         rc = -ECANCELED;
421                         goto out;
422                 }
423
424                 msleep(TPM_TIMEOUT);    /* CHECK */
425                 rmb();
426         } while (time_before(jiffies, stop));
427
428         chip->vendor.cancel(chip);
429         dev_err(chip->dev, "Operation Timed out\n");
430         rc = -ETIME;
431         goto out;
432
433 out_recv:
434         rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
435         if (rc < 0)
436                 dev_err(chip->dev,
437                         "tpm_transmit: tpm_recv: error %zd\n", rc);
438 out:
439         mutex_unlock(&chip->tpm_mutex);
440         return rc;
441 }
442
443 #define TPM_DIGEST_SIZE 20
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         else if (len < TPM_HEADER_SIZE)
473                 return -EFAULT;
474
475         err = be32_to_cpu(cmd->header.out.return_code);
476         if (err != 0)
477                 dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
478
479         return err;
480 }
481
482 #define TPM_INTERNAL_RESULT_SIZE 200
483 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
484 #define TPM_ORD_GET_CAP cpu_to_be32(101)
485
486 static const struct tpm_input_header tpm_getcap_header = {
487         .tag = TPM_TAG_RQU_COMMAND,
488         .length = cpu_to_be32(22),
489         .ordinal = TPM_ORD_GET_CAP
490 };
491
492 ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
493                    const char *desc)
494 {
495         struct tpm_cmd_t tpm_cmd;
496         int rc;
497         struct tpm_chip *chip = dev_get_drvdata(dev);
498
499         tpm_cmd.header.in = tpm_getcap_header;
500         if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
501                 tpm_cmd.params.getcap_in.cap = subcap_id;
502                 /*subcap field not necessary */
503                 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
504                 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
505         } else {
506                 if (subcap_id == TPM_CAP_FLAG_PERM ||
507                     subcap_id == TPM_CAP_FLAG_VOL)
508                         tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
509                 else
510                         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
511                 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
512                 tpm_cmd.params.getcap_in.subcap = subcap_id;
513         }
514         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
515         if (!rc)
516                 *cap = tpm_cmd.params.getcap_out.cap;
517         return rc;
518 }
519
520 void tpm_gen_interrupt(struct tpm_chip *chip)
521 {
522         struct  tpm_cmd_t tpm_cmd;
523         ssize_t rc;
524
525         tpm_cmd.header.in = tpm_getcap_header;
526         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
527         tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
528         tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
529
530         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
531                         "attempting to determine the timeouts");
532 }
533 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
534
535 int tpm_get_timeouts(struct tpm_chip *chip)
536 {
537         struct tpm_cmd_t tpm_cmd;
538         struct timeout_t *timeout_cap;
539         struct duration_t *duration_cap;
540         ssize_t rc;
541         u32 timeout;
542         unsigned int scale = 1;
543
544         tpm_cmd.header.in = tpm_getcap_header;
545         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
546         tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
547         tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
548
549         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
550                         "attempting to determine the timeouts");
551         if (rc)
552                 goto duration;
553
554         if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
555             be32_to_cpu(tpm_cmd.header.out.length)
556             != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
557                 return -EINVAL;
558
559         timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
560         /* Don't overwrite default if value is 0 */
561         timeout = be32_to_cpu(timeout_cap->a);
562         if (timeout && timeout < 1000) {
563                 /* timeouts in msec rather usec */
564                 scale = 1000;
565                 chip->vendor.timeout_adjusted = true;
566         }
567         if (timeout)
568                 chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
569         timeout = be32_to_cpu(timeout_cap->b);
570         if (timeout)
571                 chip->vendor.timeout_b = usecs_to_jiffies(timeout * scale);
572         timeout = be32_to_cpu(timeout_cap->c);
573         if (timeout)
574                 chip->vendor.timeout_c = usecs_to_jiffies(timeout * scale);
575         timeout = be32_to_cpu(timeout_cap->d);
576         if (timeout)
577                 chip->vendor.timeout_d = usecs_to_jiffies(timeout * scale);
578
579 duration:
580         tpm_cmd.header.in = tpm_getcap_header;
581         tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
582         tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
583         tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
584
585         rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
586                         "attempting to determine the durations");
587         if (rc)
588                 return rc;
589
590         if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
591             be32_to_cpu(tpm_cmd.header.out.length)
592             != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
593                 return -EINVAL;
594
595         duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
596         chip->vendor.duration[TPM_SHORT] =
597             usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
598         chip->vendor.duration[TPM_MEDIUM] =
599             usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
600         chip->vendor.duration[TPM_LONG] =
601             usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
602
603         /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
604          * value wrong and apparently reports msecs rather than usecs. So we
605          * fix up the resulting too-small TPM_SHORT value to make things work.
606          * We also scale the TPM_MEDIUM and -_LONG values by 1000.
607          */
608         if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
609                 chip->vendor.duration[TPM_SHORT] = HZ;
610                 chip->vendor.duration[TPM_MEDIUM] *= 1000;
611                 chip->vendor.duration[TPM_LONG] *= 1000;
612                 chip->vendor.duration_adjusted = true;
613                 dev_info(chip->dev, "Adjusting TPM timeout parameters.");
614         }
615         return 0;
616 }
617 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
618
619 #define TPM_ORD_CONTINUE_SELFTEST 83
620 #define CONTINUE_SELFTEST_RESULT_SIZE 10
621
622 static struct tpm_input_header continue_selftest_header = {
623         .tag = TPM_TAG_RQU_COMMAND,
624         .length = cpu_to_be32(10),
625         .ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
626 };
627
628 /**
629  * tpm_continue_selftest -- run TPM's selftest
630  * @chip: TPM chip to use
631  *
632  * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
633  * a TPM error code.
634  */
635 static int tpm_continue_selftest(struct tpm_chip *chip)
636 {
637         int rc;
638         struct tpm_cmd_t cmd;
639
640         cmd.header.in = continue_selftest_header;
641         rc = transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
642                           "continue selftest");
643         return rc;
644 }
645
646 ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
647                         char *buf)
648 {
649         cap_t cap;
650         ssize_t rc;
651
652         rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
653                          "attempting to determine the permanent enabled state");
654         if (rc)
655                 return 0;
656
657         rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
658         return rc;
659 }
660 EXPORT_SYMBOL_GPL(tpm_show_enabled);
661
662 ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
663                         char *buf)
664 {
665         cap_t cap;
666         ssize_t rc;
667
668         rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
669                          "attempting to determine the permanent active state");
670         if (rc)
671                 return 0;
672
673         rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
674         return rc;
675 }
676 EXPORT_SYMBOL_GPL(tpm_show_active);
677
678 ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
679                         char *buf)
680 {
681         cap_t cap;
682         ssize_t rc;
683
684         rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
685                          "attempting to determine the owner state");
686         if (rc)
687                 return 0;
688
689         rc = sprintf(buf, "%d\n", cap.owned);
690         return rc;
691 }
692 EXPORT_SYMBOL_GPL(tpm_show_owned);
693
694 ssize_t tpm_show_temp_deactivated(struct device * dev,
695                                 struct device_attribute * attr, char *buf)
696 {
697         cap_t cap;
698         ssize_t rc;
699
700         rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
701                          "attempting to determine the temporary state");
702         if (rc)
703                 return 0;
704
705         rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
706         return rc;
707 }
708 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
709
710 /*
711  * tpm_chip_find_get - return tpm_chip for given chip number
712  */
713 static struct tpm_chip *tpm_chip_find_get(int chip_num)
714 {
715         struct tpm_chip *pos, *chip = NULL;
716
717         rcu_read_lock();
718         list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
719                 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
720                         continue;
721
722                 if (try_module_get(pos->dev->driver->owner)) {
723                         chip = pos;
724                         break;
725                 }
726         }
727         rcu_read_unlock();
728         return chip;
729 }
730
731 #define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
732 #define READ_PCR_RESULT_SIZE 30
733 static struct tpm_input_header pcrread_header = {
734         .tag = TPM_TAG_RQU_COMMAND,
735         .length = cpu_to_be32(14),
736         .ordinal = TPM_ORDINAL_PCRREAD
737 };
738
739 static int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
740 {
741         int rc;
742         struct tpm_cmd_t cmd;
743
744         cmd.header.in = pcrread_header;
745         cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
746         rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
747                           "attempting to read a pcr value");
748
749         if (rc == 0)
750                 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
751                        TPM_DIGEST_SIZE);
752         return rc;
753 }
754
755 /**
756  * tpm_pcr_read - read a pcr value
757  * @chip_num:   tpm idx # or ANY
758  * @pcr_idx:    pcr idx to retrieve
759  * @res_buf:    TPM_PCR value
760  *              size of res_buf is 20 bytes (or NULL if you don't care)
761  *
762  * The TPM driver should be built-in, but for whatever reason it
763  * isn't, protect against the chip disappearing, by incrementing
764  * the module usage count.
765  */
766 int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
767 {
768         struct tpm_chip *chip;
769         int rc;
770
771         chip = tpm_chip_find_get(chip_num);
772         if (chip == NULL)
773                 return -ENODEV;
774         rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
775         tpm_chip_put(chip);
776         return rc;
777 }
778 EXPORT_SYMBOL_GPL(tpm_pcr_read);
779
780 /**
781  * tpm_pcr_extend - extend pcr value with hash
782  * @chip_num:   tpm idx # or AN&
783  * @pcr_idx:    pcr idx to extend
784  * @hash:       hash value used to extend pcr value
785  *
786  * The TPM driver should be built-in, but for whatever reason it
787  * isn't, protect against the chip disappearing, by incrementing
788  * the module usage count.
789  */
790 #define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
791 #define EXTEND_PCR_RESULT_SIZE 34
792 static struct tpm_input_header pcrextend_header = {
793         .tag = TPM_TAG_RQU_COMMAND,
794         .length = cpu_to_be32(34),
795         .ordinal = TPM_ORD_PCR_EXTEND
796 };
797
798 int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
799 {
800         struct tpm_cmd_t cmd;
801         int rc;
802         struct tpm_chip *chip;
803
804         chip = tpm_chip_find_get(chip_num);
805         if (chip == NULL)
806                 return -ENODEV;
807
808         cmd.header.in = pcrextend_header;
809         cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
810         memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
811         rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
812                           "attempting extend a PCR value");
813
814         tpm_chip_put(chip);
815         return rc;
816 }
817 EXPORT_SYMBOL_GPL(tpm_pcr_extend);
818
819 /**
820  * tpm_do_selftest - have the TPM continue its selftest and wait until it
821  *                   can receive further commands
822  * @chip: TPM chip to use
823  *
824  * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
825  * a TPM error code.
826  */
827 int tpm_do_selftest(struct tpm_chip *chip)
828 {
829         int rc;
830         u8 digest[TPM_DIGEST_SIZE];
831         unsigned int loops;
832         unsigned int delay_msec = 1000;
833         unsigned long duration;
834
835         duration = tpm_calc_ordinal_duration(chip,
836                                              TPM_ORD_CONTINUE_SELFTEST);
837
838         loops = jiffies_to_msecs(duration) / delay_msec;
839
840         rc = tpm_continue_selftest(chip);
841         /* This may fail if there was no TPM driver during a suspend/resume
842          * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST)
843          */
844         if (rc)
845                 return rc;
846
847         do {
848                 rc = __tpm_pcr_read(chip, 0, digest);
849                 if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
850                         dev_info(chip->dev,
851                                  "TPM is disabled/deactivated (0x%X)\n", rc);
852                         /* TPM is disabled and/or deactivated; driver can
853                          * proceed and TPM does handle commands for
854                          * suspend/resume correctly
855                          */
856                         return 0;
857                 }
858                 if (rc != TPM_WARN_DOING_SELFTEST)
859                         return rc;
860                 msleep(delay_msec);
861         } while (--loops > 0);
862
863         return rc;
864 }
865 EXPORT_SYMBOL_GPL(tpm_do_selftest);
866
867 int tpm_send(u32 chip_num, void *cmd, size_t buflen)
868 {
869         struct tpm_chip *chip;
870         int rc;
871
872         chip = tpm_chip_find_get(chip_num);
873         if (chip == NULL)
874                 return -ENODEV;
875
876         rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
877
878         tpm_chip_put(chip);
879         return rc;
880 }
881 EXPORT_SYMBOL_GPL(tpm_send);
882
883 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
884                       char *buf)
885 {
886         cap_t cap;
887         u8 digest[TPM_DIGEST_SIZE];
888         ssize_t rc;
889         int i, j, num_pcrs;
890         char *str = buf;
891         struct tpm_chip *chip = dev_get_drvdata(dev);
892
893         rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
894                         "attempting to determine the number of PCRS");
895         if (rc)
896                 return 0;
897
898         num_pcrs = be32_to_cpu(cap.num_pcrs);
899         for (i = 0; i < num_pcrs; i++) {
900                 rc = __tpm_pcr_read(chip, i, digest);
901                 if (rc)
902                         break;
903                 str += sprintf(str, "PCR-%02d: ", i);
904                 for (j = 0; j < TPM_DIGEST_SIZE; j++)
905                         str += sprintf(str, "%02X ", digest[j]);
906                 str += sprintf(str, "\n");
907         }
908         return str - buf;
909 }
910 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
911
912 #define  READ_PUBEK_RESULT_SIZE 314
913 #define TPM_ORD_READPUBEK cpu_to_be32(124)
914 struct tpm_input_header tpm_readpubek_header = {
915         .tag = TPM_TAG_RQU_COMMAND,
916         .length = cpu_to_be32(30),
917         .ordinal = TPM_ORD_READPUBEK
918 };
919
920 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
921                        char *buf)
922 {
923         u8 *data;
924         struct tpm_cmd_t tpm_cmd;
925         ssize_t err;
926         int i, rc;
927         char *str = buf;
928
929         struct tpm_chip *chip = dev_get_drvdata(dev);
930
931         tpm_cmd.header.in = tpm_readpubek_header;
932         err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
933                         "attempting to read the PUBEK");
934         if (err)
935                 goto out;
936
937         /* 
938            ignore header 10 bytes
939            algorithm 32 bits (1 == RSA )
940            encscheme 16 bits
941            sigscheme 16 bits
942            parameters (RSA 12->bytes: keybit, #primes, expbit)  
943            keylenbytes 32 bits
944            256 byte modulus
945            ignore checksum 20 bytes
946          */
947         data = tpm_cmd.params.readpubek_out_buffer;
948         str +=
949             sprintf(str,
950                     "Algorithm: %02X %02X %02X %02X\n"
951                     "Encscheme: %02X %02X\n"
952                     "Sigscheme: %02X %02X\n"
953                     "Parameters: %02X %02X %02X %02X "
954                     "%02X %02X %02X %02X "
955                     "%02X %02X %02X %02X\n"
956                     "Modulus length: %d\n"
957                     "Modulus:\n",
958                     data[0], data[1], data[2], data[3],
959                     data[4], data[5],
960                     data[6], data[7],
961                     data[12], data[13], data[14], data[15],
962                     data[16], data[17], data[18], data[19],
963                     data[20], data[21], data[22], data[23],
964                     be32_to_cpu(*((__be32 *) (data + 24))));
965
966         for (i = 0; i < 256; i++) {
967                 str += sprintf(str, "%02X ", data[i + 28]);
968                 if ((i + 1) % 16 == 0)
969                         str += sprintf(str, "\n");
970         }
971 out:
972         rc = str - buf;
973         return rc;
974 }
975 EXPORT_SYMBOL_GPL(tpm_show_pubek);
976
977
978 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
979                       char *buf)
980 {
981         cap_t cap;
982         ssize_t rc;
983         char *str = buf;
984
985         rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
986                         "attempting to determine the manufacturer");
987         if (rc)
988                 return 0;
989         str += sprintf(str, "Manufacturer: 0x%x\n",
990                        be32_to_cpu(cap.manufacturer_id));
991
992         rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
993                         "attempting to determine the 1.1 version");
994         if (rc)
995                 return 0;
996         str += sprintf(str,
997                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
998                        cap.tpm_version.Major, cap.tpm_version.Minor,
999                        cap.tpm_version.revMajor, cap.tpm_version.revMinor);
1000         return str - buf;
1001 }
1002 EXPORT_SYMBOL_GPL(tpm_show_caps);
1003
1004 ssize_t tpm_show_caps_1_2(struct device * dev,
1005                           struct device_attribute * attr, char *buf)
1006 {
1007         cap_t cap;
1008         ssize_t rc;
1009         char *str = buf;
1010
1011         rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
1012                         "attempting to determine the manufacturer");
1013         if (rc)
1014                 return 0;
1015         str += sprintf(str, "Manufacturer: 0x%x\n",
1016                        be32_to_cpu(cap.manufacturer_id));
1017         rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
1018                          "attempting to determine the 1.2 version");
1019         if (rc)
1020                 return 0;
1021         str += sprintf(str,
1022                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
1023                        cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
1024                        cap.tpm_version_1_2.revMajor,
1025                        cap.tpm_version_1_2.revMinor);
1026         return str - buf;
1027 }
1028 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
1029
1030 ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
1031                           char *buf)
1032 {
1033         struct tpm_chip *chip = dev_get_drvdata(dev);
1034
1035         if (chip->vendor.duration[TPM_LONG] == 0)
1036                 return 0;
1037
1038         return sprintf(buf, "%d %d %d [%s]\n",
1039                        jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
1040                        jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
1041                        jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
1042                        chip->vendor.duration_adjusted
1043                        ? "adjusted" : "original");
1044 }
1045 EXPORT_SYMBOL_GPL(tpm_show_durations);
1046
1047 ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
1048                           char *buf)
1049 {
1050         struct tpm_chip *chip = dev_get_drvdata(dev);
1051
1052         return sprintf(buf, "%d %d %d %d [%s]\n",
1053                        jiffies_to_usecs(chip->vendor.timeout_a),
1054                        jiffies_to_usecs(chip->vendor.timeout_b),
1055                        jiffies_to_usecs(chip->vendor.timeout_c),
1056                        jiffies_to_usecs(chip->vendor.timeout_d),
1057                        chip->vendor.timeout_adjusted
1058                        ? "adjusted" : "original");
1059 }
1060 EXPORT_SYMBOL_GPL(tpm_show_timeouts);
1061
1062 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
1063                         const char *buf, size_t count)
1064 {
1065         struct tpm_chip *chip = dev_get_drvdata(dev);
1066         if (chip == NULL)
1067                 return 0;
1068
1069         chip->vendor.cancel(chip);
1070         return count;
1071 }
1072 EXPORT_SYMBOL_GPL(tpm_store_cancel);
1073
1074 int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
1075                          wait_queue_head_t *queue)
1076 {
1077         unsigned long stop;
1078         long rc;
1079         u8 status;
1080
1081         /* check current status */
1082         status = chip->vendor.status(chip);
1083         if ((status & mask) == mask)
1084                 return 0;
1085
1086         stop = jiffies + timeout;
1087
1088         if (chip->vendor.irq) {
1089 again:
1090                 timeout = stop - jiffies;
1091                 if ((long)timeout <= 0)
1092                         return -ETIME;
1093                 rc = wait_event_interruptible_timeout(*queue,
1094                                                       ((chip->vendor.status(chip)
1095                                                       & mask) == mask),
1096                                                       timeout);
1097                 if (rc > 0)
1098                         return 0;
1099                 if (rc == -ERESTARTSYS && freezing(current)) {
1100                         clear_thread_flag(TIF_SIGPENDING);
1101                         goto again;
1102                 }
1103         } else {
1104                 do {
1105                         msleep(TPM_TIMEOUT);
1106                         status = chip->vendor.status(chip);
1107                         if ((status & mask) == mask)
1108                                 return 0;
1109                 } while (time_before(jiffies, stop));
1110         }
1111         return -ETIME;
1112 }
1113 EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
1114 /*
1115  * Device file system interface to the TPM
1116  *
1117  * It's assured that the chip will be opened just once,
1118  * by the check of is_open variable, which is protected
1119  * by driver_lock.
1120  */
1121 int tpm_open(struct inode *inode, struct file *file)
1122 {
1123         int minor = iminor(inode);
1124         struct tpm_chip *chip = NULL, *pos;
1125
1126         rcu_read_lock();
1127         list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
1128                 if (pos->vendor.miscdev.minor == minor) {
1129                         chip = pos;
1130                         get_device(chip->dev);
1131                         break;
1132                 }
1133         }
1134         rcu_read_unlock();
1135
1136         if (!chip)
1137                 return -ENODEV;
1138
1139         if (test_and_set_bit(0, &chip->is_open)) {
1140                 dev_dbg(chip->dev, "Another process owns this TPM\n");
1141                 put_device(chip->dev);
1142                 return -EBUSY;
1143         }
1144
1145         chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
1146         if (chip->data_buffer == NULL) {
1147                 clear_bit(0, &chip->is_open);
1148                 put_device(chip->dev);
1149                 return -ENOMEM;
1150         }
1151
1152         atomic_set(&chip->data_pending, 0);
1153
1154         file->private_data = chip;
1155         return 0;
1156 }
1157 EXPORT_SYMBOL_GPL(tpm_open);
1158
1159 /*
1160  * Called on file close
1161  */
1162 int tpm_release(struct inode *inode, struct file *file)
1163 {
1164         struct tpm_chip *chip = file->private_data;
1165
1166         del_singleshot_timer_sync(&chip->user_read_timer);
1167         flush_work_sync(&chip->work);
1168         file->private_data = NULL;
1169         atomic_set(&chip->data_pending, 0);
1170         kfree(chip->data_buffer);
1171         clear_bit(0, &chip->is_open);
1172         put_device(chip->dev);
1173         return 0;
1174 }
1175 EXPORT_SYMBOL_GPL(tpm_release);
1176
1177 ssize_t tpm_write(struct file *file, const char __user *buf,
1178                   size_t size, loff_t *off)
1179 {
1180         struct tpm_chip *chip = file->private_data;
1181         size_t in_size = size, out_size;
1182
1183         /* cannot perform a write until the read has cleared
1184            either via tpm_read or a user_read_timer timeout */
1185         while (atomic_read(&chip->data_pending) != 0)
1186                 msleep(TPM_TIMEOUT);
1187
1188         mutex_lock(&chip->buffer_mutex);
1189
1190         if (in_size > TPM_BUFSIZE)
1191                 in_size = TPM_BUFSIZE;
1192
1193         if (copy_from_user
1194             (chip->data_buffer, (void __user *) buf, in_size)) {
1195                 mutex_unlock(&chip->buffer_mutex);
1196                 return -EFAULT;
1197         }
1198
1199         /* atomic tpm command send and result receive */
1200         out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1201
1202         atomic_set(&chip->data_pending, out_size);
1203         mutex_unlock(&chip->buffer_mutex);
1204
1205         /* Set a timeout by which the reader must come claim the result */
1206         mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1207
1208         return in_size;
1209 }
1210 EXPORT_SYMBOL_GPL(tpm_write);
1211
1212 ssize_t tpm_read(struct file *file, char __user *buf,
1213                  size_t size, loff_t *off)
1214 {
1215         struct tpm_chip *chip = file->private_data;
1216         ssize_t ret_size;
1217         int rc;
1218
1219         del_singleshot_timer_sync(&chip->user_read_timer);
1220         flush_work_sync(&chip->work);
1221         ret_size = atomic_read(&chip->data_pending);
1222         atomic_set(&chip->data_pending, 0);
1223         if (ret_size > 0) {     /* relay data */
1224                 if (size < ret_size)
1225                         ret_size = size;
1226
1227                 mutex_lock(&chip->buffer_mutex);
1228                 rc = copy_to_user(buf, chip->data_buffer, ret_size);
1229                 memset(chip->data_buffer, 0, ret_size);
1230                 if (rc)
1231                         ret_size = -EFAULT;
1232
1233                 mutex_unlock(&chip->buffer_mutex);
1234         }
1235
1236         return ret_size;
1237 }
1238 EXPORT_SYMBOL_GPL(tpm_read);
1239
1240 void tpm_remove_hardware(struct device *dev)
1241 {
1242         struct tpm_chip *chip = dev_get_drvdata(dev);
1243
1244         if (chip == NULL) {
1245                 dev_err(dev, "No device data found\n");
1246                 return;
1247         }
1248
1249         spin_lock(&driver_lock);
1250         list_del_rcu(&chip->list);
1251         spin_unlock(&driver_lock);
1252         synchronize_rcu();
1253
1254         misc_deregister(&chip->vendor.miscdev);
1255         sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1256         tpm_bios_log_teardown(chip->bios_dir);
1257
1258         /* write it this way to be explicit (chip->dev == dev) */
1259         put_device(chip->dev);
1260 }
1261 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1262
1263 #define TPM_ORD_SAVESTATE cpu_to_be32(152)
1264 #define SAVESTATE_RESULT_SIZE 10
1265
1266 static struct tpm_input_header savestate_header = {
1267         .tag = TPM_TAG_RQU_COMMAND,
1268         .length = cpu_to_be32(10),
1269         .ordinal = TPM_ORD_SAVESTATE
1270 };
1271
1272 /*
1273  * We are about to suspend. Save the TPM state
1274  * so that it can be restored.
1275  */
1276 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1277 {
1278         struct tpm_chip *chip = dev_get_drvdata(dev);
1279         struct tpm_cmd_t cmd;
1280         int rc;
1281
1282         u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
1283
1284         if (chip == NULL)
1285                 return -ENODEV;
1286
1287         /* for buggy tpm, flush pcrs with extend to selected dummy */
1288         if (tpm_suspend_pcr) {
1289                 cmd.header.in = pcrextend_header;
1290                 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1291                 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1292                        TPM_DIGEST_SIZE);
1293                 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1294                                   "extending dummy pcr before suspend");
1295         }
1296
1297         /* now do the actual savestate */
1298         cmd.header.in = savestate_header;
1299         rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
1300                           "sending savestate before suspend");
1301         return rc;
1302 }
1303 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1304
1305 /*
1306  * Resume from a power safe. The BIOS already restored
1307  * the TPM state.
1308  */
1309 int tpm_pm_resume(struct device *dev)
1310 {
1311         struct tpm_chip *chip = dev_get_drvdata(dev);
1312
1313         if (chip == NULL)
1314                 return -ENODEV;
1315
1316         return 0;
1317 }
1318 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1319
1320 /* In case vendor provided release function, call it too.*/
1321
1322 void tpm_dev_vendor_release(struct tpm_chip *chip)
1323 {
1324         if (chip->vendor.release)
1325                 chip->vendor.release(chip->dev);
1326
1327         clear_bit(chip->dev_num, dev_mask);
1328         kfree(chip->vendor.miscdev.name);
1329 }
1330 EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1331
1332
1333 /*
1334  * Once all references to platform device are down to 0,
1335  * release all allocated structures.
1336  */
1337 void tpm_dev_release(struct device *dev)
1338 {
1339         struct tpm_chip *chip = dev_get_drvdata(dev);
1340
1341         tpm_dev_vendor_release(chip);
1342
1343         chip->release(dev);
1344         kfree(chip);
1345 }
1346 EXPORT_SYMBOL_GPL(tpm_dev_release);
1347
1348 /*
1349  * Called from tpm_<specific>.c probe function only for devices 
1350  * the driver has determined it should claim.  Prior to calling
1351  * this function the specific probe function has called pci_enable_device
1352  * upon errant exit from this function specific probe function should call
1353  * pci_disable_device
1354  */
1355 struct tpm_chip *tpm_register_hardware(struct device *dev,
1356                                         const struct tpm_vendor_specific *entry)
1357 {
1358 #define DEVNAME_SIZE 7
1359
1360         char *devname;
1361         struct tpm_chip *chip;
1362
1363         /* Driver specific per-device data */
1364         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1365         devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1366
1367         if (chip == NULL || devname == NULL)
1368                 goto out_free;
1369
1370         mutex_init(&chip->buffer_mutex);
1371         mutex_init(&chip->tpm_mutex);
1372         INIT_LIST_HEAD(&chip->list);
1373
1374         INIT_WORK(&chip->work, timeout_work);
1375
1376         setup_timer(&chip->user_read_timer, user_reader_timeout,
1377                         (unsigned long)chip);
1378
1379         memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1380
1381         chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1382
1383         if (chip->dev_num >= TPM_NUM_DEVICES) {
1384                 dev_err(dev, "No available tpm device numbers\n");
1385                 goto out_free;
1386         } else if (chip->dev_num == 0)
1387                 chip->vendor.miscdev.minor = TPM_MINOR;
1388         else
1389                 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1390
1391         set_bit(chip->dev_num, dev_mask);
1392
1393         scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
1394         chip->vendor.miscdev.name = devname;
1395
1396         chip->vendor.miscdev.parent = dev;
1397         chip->dev = get_device(dev);
1398         chip->release = dev->release;
1399         dev->release = tpm_dev_release;
1400         dev_set_drvdata(dev, chip);
1401
1402         if (misc_register(&chip->vendor.miscdev)) {
1403                 dev_err(chip->dev,
1404                         "unable to misc_register %s, minor %d\n",
1405                         chip->vendor.miscdev.name,
1406                         chip->vendor.miscdev.minor);
1407                 put_device(chip->dev);
1408                 return NULL;
1409         }
1410
1411         if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1412                 misc_deregister(&chip->vendor.miscdev);
1413                 put_device(chip->dev);
1414
1415                 return NULL;
1416         }
1417
1418         chip->bios_dir = tpm_bios_log_setup(devname);
1419
1420         /* Make chip available */
1421         spin_lock(&driver_lock);
1422         list_add_rcu(&chip->list, &tpm_chip_list);
1423         spin_unlock(&driver_lock);
1424
1425         return chip;
1426
1427 out_free:
1428         kfree(chip);
1429         kfree(devname);
1430         return NULL;
1431 }
1432 EXPORT_SYMBOL_GPL(tpm_register_hardware);
1433
1434 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1435 MODULE_DESCRIPTION("TPM Driver");
1436 MODULE_VERSION("2.0");
1437 MODULE_LICENSE("GPL");