Merge commit 'kumar/kumar-next'
[linux-2.6] / 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/mutex.h>
28 #include <linux/spinlock.h>
29 #include <linux/smp_lock.h>
30
31 #include "tpm.h"
32
33 enum tpm_const {
34         TPM_MINOR = 224,        /* officially assigned */
35         TPM_BUFSIZE = 2048,
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 static LIST_HEAD(tpm_chip_list);
51 static DEFINE_SPINLOCK(driver_lock);
52 static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
53
54 /*
55  * Array with one entry per ordinal defining the maximum amount
56  * of time the chip could take to return the result.  The ordinal
57  * designation of short, medium or long is defined in a table in
58  * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
59  * values of the SHORT, MEDIUM, and LONG durations are retrieved
60  * from the chip during initialization with a call to tpm_get_timeouts.
61  */
62 static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
63         TPM_UNDEFINED,          /* 0 */
64         TPM_UNDEFINED,
65         TPM_UNDEFINED,
66         TPM_UNDEFINED,
67         TPM_UNDEFINED,
68         TPM_UNDEFINED,          /* 5 */
69         TPM_UNDEFINED,
70         TPM_UNDEFINED,
71         TPM_UNDEFINED,
72         TPM_UNDEFINED,
73         TPM_SHORT,              /* 10 */
74         TPM_SHORT,
75 };
76
77 static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
78         TPM_UNDEFINED,          /* 0 */
79         TPM_UNDEFINED,
80         TPM_UNDEFINED,
81         TPM_UNDEFINED,
82         TPM_UNDEFINED,
83         TPM_UNDEFINED,          /* 5 */
84         TPM_UNDEFINED,
85         TPM_UNDEFINED,
86         TPM_UNDEFINED,
87         TPM_UNDEFINED,
88         TPM_SHORT,              /* 10 */
89         TPM_SHORT,
90         TPM_MEDIUM,
91         TPM_LONG,
92         TPM_LONG,
93         TPM_MEDIUM,             /* 15 */
94         TPM_SHORT,
95         TPM_SHORT,
96         TPM_MEDIUM,
97         TPM_LONG,
98         TPM_SHORT,              /* 20 */
99         TPM_SHORT,
100         TPM_MEDIUM,
101         TPM_MEDIUM,
102         TPM_MEDIUM,
103         TPM_SHORT,              /* 25 */
104         TPM_SHORT,
105         TPM_MEDIUM,
106         TPM_SHORT,
107         TPM_SHORT,
108         TPM_MEDIUM,             /* 30 */
109         TPM_LONG,
110         TPM_MEDIUM,
111         TPM_SHORT,
112         TPM_SHORT,
113         TPM_SHORT,              /* 35 */
114         TPM_MEDIUM,
115         TPM_MEDIUM,
116         TPM_UNDEFINED,
117         TPM_UNDEFINED,
118         TPM_MEDIUM,             /* 40 */
119         TPM_LONG,
120         TPM_MEDIUM,
121         TPM_SHORT,
122         TPM_SHORT,
123         TPM_SHORT,              /* 45 */
124         TPM_SHORT,
125         TPM_SHORT,
126         TPM_SHORT,
127         TPM_LONG,
128         TPM_MEDIUM,             /* 50 */
129         TPM_MEDIUM,
130         TPM_UNDEFINED,
131         TPM_UNDEFINED,
132         TPM_UNDEFINED,
133         TPM_UNDEFINED,          /* 55 */
134         TPM_UNDEFINED,
135         TPM_UNDEFINED,
136         TPM_UNDEFINED,
137         TPM_UNDEFINED,
138         TPM_MEDIUM,             /* 60 */
139         TPM_MEDIUM,
140         TPM_MEDIUM,
141         TPM_SHORT,
142         TPM_SHORT,
143         TPM_MEDIUM,             /* 65 */
144         TPM_UNDEFINED,
145         TPM_UNDEFINED,
146         TPM_UNDEFINED,
147         TPM_UNDEFINED,
148         TPM_SHORT,              /* 70 */
149         TPM_SHORT,
150         TPM_UNDEFINED,
151         TPM_UNDEFINED,
152         TPM_UNDEFINED,
153         TPM_UNDEFINED,          /* 75 */
154         TPM_UNDEFINED,
155         TPM_UNDEFINED,
156         TPM_UNDEFINED,
157         TPM_UNDEFINED,
158         TPM_LONG,               /* 80 */
159         TPM_UNDEFINED,
160         TPM_MEDIUM,
161         TPM_LONG,
162         TPM_SHORT,
163         TPM_UNDEFINED,          /* 85 */
164         TPM_UNDEFINED,
165         TPM_UNDEFINED,
166         TPM_UNDEFINED,
167         TPM_UNDEFINED,
168         TPM_SHORT,              /* 90 */
169         TPM_SHORT,
170         TPM_SHORT,
171         TPM_SHORT,
172         TPM_SHORT,
173         TPM_UNDEFINED,          /* 95 */
174         TPM_UNDEFINED,
175         TPM_UNDEFINED,
176         TPM_UNDEFINED,
177         TPM_UNDEFINED,
178         TPM_MEDIUM,             /* 100 */
179         TPM_SHORT,
180         TPM_SHORT,
181         TPM_UNDEFINED,
182         TPM_UNDEFINED,
183         TPM_UNDEFINED,          /* 105 */
184         TPM_UNDEFINED,
185         TPM_UNDEFINED,
186         TPM_UNDEFINED,
187         TPM_UNDEFINED,
188         TPM_SHORT,              /* 110 */
189         TPM_SHORT,
190         TPM_SHORT,
191         TPM_SHORT,
192         TPM_SHORT,
193         TPM_SHORT,              /* 115 */
194         TPM_SHORT,
195         TPM_SHORT,
196         TPM_UNDEFINED,
197         TPM_UNDEFINED,
198         TPM_LONG,               /* 120 */
199         TPM_LONG,
200         TPM_MEDIUM,
201         TPM_UNDEFINED,
202         TPM_SHORT,
203         TPM_SHORT,              /* 125 */
204         TPM_SHORT,
205         TPM_LONG,
206         TPM_SHORT,
207         TPM_SHORT,
208         TPM_SHORT,              /* 130 */
209         TPM_MEDIUM,
210         TPM_UNDEFINED,
211         TPM_SHORT,
212         TPM_MEDIUM,
213         TPM_UNDEFINED,          /* 135 */
214         TPM_UNDEFINED,
215         TPM_UNDEFINED,
216         TPM_UNDEFINED,
217         TPM_UNDEFINED,
218         TPM_SHORT,              /* 140 */
219         TPM_SHORT,
220         TPM_UNDEFINED,
221         TPM_UNDEFINED,
222         TPM_UNDEFINED,
223         TPM_UNDEFINED,          /* 145 */
224         TPM_UNDEFINED,
225         TPM_UNDEFINED,
226         TPM_UNDEFINED,
227         TPM_UNDEFINED,
228         TPM_SHORT,              /* 150 */
229         TPM_MEDIUM,
230         TPM_MEDIUM,
231         TPM_SHORT,
232         TPM_SHORT,
233         TPM_UNDEFINED,          /* 155 */
234         TPM_UNDEFINED,
235         TPM_UNDEFINED,
236         TPM_UNDEFINED,
237         TPM_UNDEFINED,
238         TPM_SHORT,              /* 160 */
239         TPM_SHORT,
240         TPM_SHORT,
241         TPM_SHORT,
242         TPM_UNDEFINED,
243         TPM_UNDEFINED,          /* 165 */
244         TPM_UNDEFINED,
245         TPM_UNDEFINED,
246         TPM_UNDEFINED,
247         TPM_UNDEFINED,
248         TPM_LONG,               /* 170 */
249         TPM_UNDEFINED,
250         TPM_UNDEFINED,
251         TPM_UNDEFINED,
252         TPM_UNDEFINED,
253         TPM_UNDEFINED,          /* 175 */
254         TPM_UNDEFINED,
255         TPM_UNDEFINED,
256         TPM_UNDEFINED,
257         TPM_UNDEFINED,
258         TPM_MEDIUM,             /* 180 */
259         TPM_SHORT,
260         TPM_MEDIUM,
261         TPM_MEDIUM,
262         TPM_MEDIUM,
263         TPM_MEDIUM,             /* 185 */
264         TPM_SHORT,
265         TPM_UNDEFINED,
266         TPM_UNDEFINED,
267         TPM_UNDEFINED,
268         TPM_UNDEFINED,          /* 190 */
269         TPM_UNDEFINED,
270         TPM_UNDEFINED,
271         TPM_UNDEFINED,
272         TPM_UNDEFINED,
273         TPM_UNDEFINED,          /* 195 */
274         TPM_UNDEFINED,
275         TPM_UNDEFINED,
276         TPM_UNDEFINED,
277         TPM_UNDEFINED,
278         TPM_SHORT,              /* 200 */
279         TPM_UNDEFINED,
280         TPM_UNDEFINED,
281         TPM_UNDEFINED,
282         TPM_SHORT,
283         TPM_SHORT,              /* 205 */
284         TPM_SHORT,
285         TPM_SHORT,
286         TPM_SHORT,
287         TPM_SHORT,
288         TPM_MEDIUM,             /* 210 */
289         TPM_UNDEFINED,
290         TPM_MEDIUM,
291         TPM_MEDIUM,
292         TPM_MEDIUM,
293         TPM_UNDEFINED,          /* 215 */
294         TPM_MEDIUM,
295         TPM_UNDEFINED,
296         TPM_UNDEFINED,
297         TPM_SHORT,
298         TPM_SHORT,              /* 220 */
299         TPM_SHORT,
300         TPM_SHORT,
301         TPM_SHORT,
302         TPM_SHORT,
303         TPM_UNDEFINED,          /* 225 */
304         TPM_UNDEFINED,
305         TPM_UNDEFINED,
306         TPM_UNDEFINED,
307         TPM_UNDEFINED,
308         TPM_SHORT,              /* 230 */
309         TPM_LONG,
310         TPM_MEDIUM,
311         TPM_UNDEFINED,
312         TPM_UNDEFINED,
313         TPM_UNDEFINED,          /* 235 */
314         TPM_UNDEFINED,
315         TPM_UNDEFINED,
316         TPM_UNDEFINED,
317         TPM_UNDEFINED,
318         TPM_SHORT,              /* 240 */
319         TPM_UNDEFINED,
320         TPM_MEDIUM,
321 };
322
323 static void user_reader_timeout(unsigned long ptr)
324 {
325         struct tpm_chip *chip = (struct tpm_chip *) ptr;
326
327         schedule_work(&chip->work);
328 }
329
330 static void timeout_work(struct work_struct *work)
331 {
332         struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
333
334         mutex_lock(&chip->buffer_mutex);
335         atomic_set(&chip->data_pending, 0);
336         memset(chip->data_buffer, 0, TPM_BUFSIZE);
337         mutex_unlock(&chip->buffer_mutex);
338 }
339
340 /*
341  * Returns max number of jiffies to wait
342  */
343 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
344                                            u32 ordinal)
345 {
346         int duration_idx = TPM_UNDEFINED;
347         int duration = 0;
348
349         if (ordinal < TPM_MAX_ORDINAL)
350                 duration_idx = tpm_ordinal_duration[ordinal];
351         else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
352                  TPM_MAX_PROTECTED_ORDINAL)
353                 duration_idx =
354                     tpm_protected_ordinal_duration[ordinal &
355                                                    TPM_PROTECTED_ORDINAL_MASK];
356
357         if (duration_idx != TPM_UNDEFINED)
358                 duration = chip->vendor.duration[duration_idx];
359         if (duration <= 0)
360                 return 2 * 60 * HZ;
361         else
362                 return duration;
363 }
364 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
365
366 /*
367  * Internal kernel interface to transmit TPM commands
368  */
369 static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
370                             size_t bufsiz)
371 {
372         ssize_t rc;
373         u32 count, ordinal;
374         unsigned long stop;
375
376         count = be32_to_cpu(*((__be32 *) (buf + 2)));
377         ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
378         if (count == 0)
379                 return -ENODATA;
380         if (count > bufsiz) {
381                 dev_err(chip->dev,
382                         "invalid count value %x %zx \n", count, bufsiz);
383                 return -E2BIG;
384         }
385
386         mutex_lock(&chip->tpm_mutex);
387
388         if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
389                 dev_err(chip->dev,
390                         "tpm_transmit: tpm_send: error %zd\n", rc);
391                 goto out;
392         }
393
394         if (chip->vendor.irq)
395                 goto out_recv;
396
397         stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
398         do {
399                 u8 status = chip->vendor.status(chip);
400                 if ((status & chip->vendor.req_complete_mask) ==
401                     chip->vendor.req_complete_val)
402                         goto out_recv;
403
404                 if ((status == chip->vendor.req_canceled)) {
405                         dev_err(chip->dev, "Operation Canceled\n");
406                         rc = -ECANCELED;
407                         goto out;
408                 }
409
410                 msleep(TPM_TIMEOUT);    /* CHECK */
411                 rmb();
412         } while (time_before(jiffies, stop));
413
414         chip->vendor.cancel(chip);
415         dev_err(chip->dev, "Operation Timed out\n");
416         rc = -ETIME;
417         goto out;
418
419 out_recv:
420         rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
421         if (rc < 0)
422                 dev_err(chip->dev,
423                         "tpm_transmit: tpm_recv: error %zd\n", rc);
424 out:
425         mutex_unlock(&chip->tpm_mutex);
426         return rc;
427 }
428
429 #define TPM_DIGEST_SIZE 20
430 #define TPM_ERROR_SIZE 10
431 #define TPM_RET_CODE_IDX 6
432 #define TPM_GET_CAP_RET_SIZE_IDX 10
433 #define TPM_GET_CAP_RET_UINT32_1_IDX 14
434 #define TPM_GET_CAP_RET_UINT32_2_IDX 18
435 #define TPM_GET_CAP_RET_UINT32_3_IDX 22
436 #define TPM_GET_CAP_RET_UINT32_4_IDX 26
437 #define TPM_GET_CAP_PERM_DISABLE_IDX 16
438 #define TPM_GET_CAP_PERM_INACTIVE_IDX 18
439 #define TPM_GET_CAP_RET_BOOL_1_IDX 14
440 #define TPM_GET_CAP_TEMP_INACTIVE_IDX 16
441
442 #define TPM_CAP_IDX 13
443 #define TPM_CAP_SUBCAP_IDX 21
444
445 enum tpm_capabilities {
446         TPM_CAP_FLAG = 4,
447         TPM_CAP_PROP = 5,
448 };
449
450 enum tpm_sub_capabilities {
451         TPM_CAP_PROP_PCR = 0x1,
452         TPM_CAP_PROP_MANUFACTURER = 0x3,
453         TPM_CAP_FLAG_PERM = 0x8,
454         TPM_CAP_FLAG_VOL = 0x9,
455         TPM_CAP_PROP_OWNER = 0x11,
456         TPM_CAP_PROP_TIS_TIMEOUT = 0x15,
457         TPM_CAP_PROP_TIS_DURATION = 0x20,
458 };
459
460 /*
461  * This is a semi generic GetCapability command for use
462  * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG
463  * and their associated sub_capabilities.
464  */
465
466 static const u8 tpm_cap[] = {
467         0, 193,                 /* TPM_TAG_RQU_COMMAND */
468         0, 0, 0, 22,            /* length */
469         0, 0, 0, 101,           /* TPM_ORD_GetCapability */
470         0, 0, 0, 0,             /* TPM_CAP_<TYPE> */
471         0, 0, 0, 4,             /* TPM_CAP_SUB_<TYPE> size */
472         0, 0, 1, 0              /* TPM_CAP_SUB_<TYPE> */
473 };
474
475 static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len,
476                             char *desc)
477 {
478         int err;
479
480         len = tpm_transmit(chip, data, len);
481         if (len <  0)
482                 return len;
483         if (len == TPM_ERROR_SIZE) {
484                 err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)));
485                 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
486                 return err;
487         }
488         return 0;
489 }
490
491 void tpm_gen_interrupt(struct tpm_chip *chip)
492 {
493         u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
494         ssize_t rc;
495
496         memcpy(data, tpm_cap, sizeof(tpm_cap));
497         data[TPM_CAP_IDX] = TPM_CAP_PROP;
498         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
499
500         rc = transmit_cmd(chip, data, sizeof(data),
501                         "attempting to determine the timeouts");
502 }
503 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
504
505 void tpm_get_timeouts(struct tpm_chip *chip)
506 {
507         u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
508         ssize_t rc;
509         u32 timeout;
510
511         memcpy(data, tpm_cap, sizeof(tpm_cap));
512         data[TPM_CAP_IDX] = TPM_CAP_PROP;
513         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
514
515         rc = transmit_cmd(chip, data, sizeof(data),
516                         "attempting to determine the timeouts");
517         if (rc)
518                 goto duration;
519
520         if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
521             != 4 * sizeof(u32))
522                 goto duration;
523
524         /* Don't overwrite default if value is 0 */
525         timeout =
526             be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)));
527         if (timeout)
528                 chip->vendor.timeout_a = msecs_to_jiffies(timeout);
529         timeout =
530             be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)));
531         if (timeout)
532                 chip->vendor.timeout_b = msecs_to_jiffies(timeout);
533         timeout =
534             be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)));
535         if (timeout)
536                 chip->vendor.timeout_c = msecs_to_jiffies(timeout);
537         timeout =
538             be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX)));
539         if (timeout)
540                 chip->vendor.timeout_d = msecs_to_jiffies(timeout);
541
542 duration:
543         memcpy(data, tpm_cap, sizeof(tpm_cap));
544         data[TPM_CAP_IDX] = TPM_CAP_PROP;
545         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_DURATION;
546
547         rc = transmit_cmd(chip, data, sizeof(data),
548                         "attempting to determine the durations");
549         if (rc)
550                 return;
551
552         if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
553             != 3 * sizeof(u32))
554                 return;
555
556         chip->vendor.duration[TPM_SHORT] =
557             msecs_to_jiffies(be32_to_cpu
558                              (*((__be32 *) (data +
559                                             TPM_GET_CAP_RET_UINT32_1_IDX))));
560         chip->vendor.duration[TPM_MEDIUM] =
561             msecs_to_jiffies(be32_to_cpu
562                              (*((__be32 *) (data +
563                                             TPM_GET_CAP_RET_UINT32_2_IDX))));
564         chip->vendor.duration[TPM_LONG] =
565             msecs_to_jiffies(be32_to_cpu
566                              (*((__be32 *) (data +
567                                             TPM_GET_CAP_RET_UINT32_3_IDX))));
568 }
569 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
570
571 void tpm_continue_selftest(struct tpm_chip *chip)
572 {
573         u8 data[] = {
574                 0, 193,                 /* TPM_TAG_RQU_COMMAND */
575                 0, 0, 0, 10,            /* length */
576                 0, 0, 0, 83,            /* TPM_ORD_GetCapability */
577         };
578
579         tpm_transmit(chip, data, sizeof(data));
580 }
581 EXPORT_SYMBOL_GPL(tpm_continue_selftest);
582
583 #define  TPM_INTERNAL_RESULT_SIZE 200
584
585 ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
586                         char *buf)
587 {
588         u8 *data;
589         ssize_t rc;
590
591         struct tpm_chip *chip = dev_get_drvdata(dev);
592         if (chip == NULL)
593                 return -ENODEV;
594
595         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
596         if (!data)
597                 return -ENOMEM;
598
599         memcpy(data, tpm_cap, sizeof(tpm_cap));
600         data[TPM_CAP_IDX] = TPM_CAP_FLAG;
601         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
602
603         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
604                         "attemtping to determine the permanent enabled state");
605         if (rc) {
606                 kfree(data);
607                 return 0;
608         }
609
610         rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]);
611
612         kfree(data);
613         return rc;
614 }
615 EXPORT_SYMBOL_GPL(tpm_show_enabled);
616
617 ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
618                         char *buf)
619 {
620         u8 *data;
621         ssize_t rc;
622
623         struct tpm_chip *chip = dev_get_drvdata(dev);
624         if (chip == NULL)
625                 return -ENODEV;
626
627         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
628         if (!data)
629                 return -ENOMEM;
630
631         memcpy(data, tpm_cap, sizeof(tpm_cap));
632         data[TPM_CAP_IDX] = TPM_CAP_FLAG;
633         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
634
635         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
636                         "attemtping to determine the permanent active state");
637         if (rc) {
638                 kfree(data);
639                 return 0;
640         }
641
642         rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]);
643
644         kfree(data);
645         return rc;
646 }
647 EXPORT_SYMBOL_GPL(tpm_show_active);
648
649 ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
650                         char *buf)
651 {
652         u8 *data;
653         ssize_t rc;
654
655         struct tpm_chip *chip = dev_get_drvdata(dev);
656         if (chip == NULL)
657                 return -ENODEV;
658
659         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
660         if (!data)
661                 return -ENOMEM;
662
663         memcpy(data, tpm_cap, sizeof(tpm_cap));
664         data[TPM_CAP_IDX] = TPM_CAP_PROP;
665         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER;
666
667         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
668                         "attempting to determine the owner state");
669         if (rc) {
670                 kfree(data);
671                 return 0;
672         }
673
674         rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]);
675
676         kfree(data);
677         return rc;
678 }
679 EXPORT_SYMBOL_GPL(tpm_show_owned);
680
681 ssize_t tpm_show_temp_deactivated(struct device * dev,
682                                 struct device_attribute * attr, char *buf)
683 {
684         u8 *data;
685         ssize_t rc;
686
687         struct tpm_chip *chip = dev_get_drvdata(dev);
688         if (chip == NULL)
689                 return -ENODEV;
690
691         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
692         if (!data)
693                 return -ENOMEM;
694
695         memcpy(data, tpm_cap, sizeof(tpm_cap));
696         data[TPM_CAP_IDX] = TPM_CAP_FLAG;
697         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL;
698
699         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
700                         "attempting to determine the temporary state");
701         if (rc) {
702                 kfree(data);
703                 return 0;
704         }
705
706         rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]);
707
708         kfree(data);
709         return rc;
710 }
711 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
712
713 static const u8 pcrread[] = {
714         0, 193,                 /* TPM_TAG_RQU_COMMAND */
715         0, 0, 0, 14,            /* length */
716         0, 0, 0, 21,            /* TPM_ORD_PcrRead */
717         0, 0, 0, 0              /* PCR index */
718 };
719
720 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
721                       char *buf)
722 {
723         u8 *data;
724         ssize_t rc;
725         int i, j, num_pcrs;
726         __be32 index;
727         char *str = buf;
728
729         struct tpm_chip *chip = dev_get_drvdata(dev);
730         if (chip == NULL)
731                 return -ENODEV;
732
733         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
734         if (!data)
735                 return -ENOMEM;
736
737         memcpy(data, tpm_cap, sizeof(tpm_cap));
738         data[TPM_CAP_IDX] = TPM_CAP_PROP;
739         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR;
740
741         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
742                         "attempting to determine the number of PCRS");
743         if (rc) {
744                 kfree(data);
745                 return 0;
746         }
747
748         num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));
749         for (i = 0; i < num_pcrs; i++) {
750                 memcpy(data, pcrread, sizeof(pcrread));
751                 index = cpu_to_be32(i);
752                 memcpy(data + 10, &index, 4);
753                 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
754                                 "attempting to read a PCR");
755                 if (rc)
756                         goto out;
757                 str += sprintf(str, "PCR-%02d: ", i);
758                 for (j = 0; j < TPM_DIGEST_SIZE; j++)
759                         str += sprintf(str, "%02X ", *(data + 10 + j));
760                 str += sprintf(str, "\n");
761         }
762 out:
763         kfree(data);
764         return str - buf;
765 }
766 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
767
768 #define  READ_PUBEK_RESULT_SIZE 314
769 static const u8 readpubek[] = {
770         0, 193,                 /* TPM_TAG_RQU_COMMAND */
771         0, 0, 0, 30,            /* length */
772         0, 0, 0, 124,           /* TPM_ORD_ReadPubek */
773 };
774
775 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
776                        char *buf)
777 {
778         u8 *data;
779         ssize_t err;
780         int i, rc;
781         char *str = buf;
782
783         struct tpm_chip *chip = dev_get_drvdata(dev);
784         if (chip == NULL)
785                 return -ENODEV;
786
787         data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);
788         if (!data)
789                 return -ENOMEM;
790
791         memcpy(data, readpubek, sizeof(readpubek));
792
793         err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE,
794                         "attempting to read the PUBEK");
795         if (err)
796                 goto out;
797
798         /* 
799            ignore header 10 bytes
800            algorithm 32 bits (1 == RSA )
801            encscheme 16 bits
802            sigscheme 16 bits
803            parameters (RSA 12->bytes: keybit, #primes, expbit)  
804            keylenbytes 32 bits
805            256 byte modulus
806            ignore checksum 20 bytes
807          */
808
809         str +=
810             sprintf(str,
811                     "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
812                     "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
813                     " %02X %02X %02X %02X %02X %02X %02X %02X\n"
814                     "Modulus length: %d\nModulus: \n",
815                     data[10], data[11], data[12], data[13], data[14],
816                     data[15], data[16], data[17], data[22], data[23],
817                     data[24], data[25], data[26], data[27], data[28],
818                     data[29], data[30], data[31], data[32], data[33],
819                     be32_to_cpu(*((__be32 *) (data + 34))));
820
821         for (i = 0; i < 256; i++) {
822                 str += sprintf(str, "%02X ", data[i + 38]);
823                 if ((i + 1) % 16 == 0)
824                         str += sprintf(str, "\n");
825         }
826 out:
827         rc = str - buf;
828         kfree(data);
829         return rc;
830 }
831 EXPORT_SYMBOL_GPL(tpm_show_pubek);
832
833 #define CAP_VERSION_1_1 6
834 #define CAP_VERSION_1_2 0x1A
835 #define CAP_VERSION_IDX 13
836 static const u8 cap_version[] = {
837         0, 193,                 /* TPM_TAG_RQU_COMMAND */
838         0, 0, 0, 18,            /* length */
839         0, 0, 0, 101,           /* TPM_ORD_GetCapability */
840         0, 0, 0, 0,
841         0, 0, 0, 0
842 };
843
844 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
845                       char *buf)
846 {
847         u8 *data;
848         ssize_t rc;
849         char *str = buf;
850
851         struct tpm_chip *chip = dev_get_drvdata(dev);
852         if (chip == NULL)
853                 return -ENODEV;
854
855         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
856         if (!data)
857                 return -ENOMEM;
858
859         memcpy(data, tpm_cap, sizeof(tpm_cap));
860         data[TPM_CAP_IDX] = TPM_CAP_PROP;
861         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
862
863         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
864                         "attempting to determine the manufacturer");
865         if (rc) {
866                 kfree(data);
867                 return 0;
868         }
869
870         str += sprintf(str, "Manufacturer: 0x%x\n",
871                        be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
872
873         memcpy(data, cap_version, sizeof(cap_version));
874         data[CAP_VERSION_IDX] = CAP_VERSION_1_1;
875         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
876                         "attempting to determine the 1.1 version");
877         if (rc)
878                 goto out;
879
880         str += sprintf(str,
881                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
882                        (int) data[14], (int) data[15], (int) data[16],
883                        (int) data[17]);
884
885 out:
886         kfree(data);
887         return str - buf;
888 }
889 EXPORT_SYMBOL_GPL(tpm_show_caps);
890
891 ssize_t tpm_show_caps_1_2(struct device * dev,
892                           struct device_attribute * attr, char *buf)
893 {
894         u8 *data;
895         ssize_t len;
896         char *str = buf;
897
898         struct tpm_chip *chip = dev_get_drvdata(dev);
899         if (chip == NULL)
900                 return -ENODEV;
901
902         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
903         if (!data)
904                 return -ENOMEM;
905
906         memcpy(data, tpm_cap, sizeof(tpm_cap));
907         data[TPM_CAP_IDX] = TPM_CAP_PROP;
908         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
909
910         len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE);
911         if (len <= TPM_ERROR_SIZE) {
912                 dev_dbg(chip->dev, "A TPM error (%d) occurred "
913                         "attempting to determine the manufacturer\n",
914                         be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
915                 kfree(data);
916                 return 0;
917         }
918
919         str += sprintf(str, "Manufacturer: 0x%x\n",
920                        be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
921
922         memcpy(data, cap_version, sizeof(cap_version));
923         data[CAP_VERSION_IDX] = CAP_VERSION_1_2;
924
925         len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE);
926         if (len <= TPM_ERROR_SIZE) {
927                 dev_err(chip->dev, "A TPM error (%d) occurred "
928                         "attempting to determine the 1.2 version\n",
929                         be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
930                 goto out;
931         }
932         str += sprintf(str,
933                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
934                        (int) data[16], (int) data[17], (int) data[18],
935                        (int) data[19]);
936
937 out:
938         kfree(data);
939         return str - buf;
940 }
941 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
942
943 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
944                         const char *buf, size_t count)
945 {
946         struct tpm_chip *chip = dev_get_drvdata(dev);
947         if (chip == NULL)
948                 return 0;
949
950         chip->vendor.cancel(chip);
951         return count;
952 }
953 EXPORT_SYMBOL_GPL(tpm_store_cancel);
954
955 /*
956  * Device file system interface to the TPM
957  */
958 int tpm_open(struct inode *inode, struct file *file)
959 {
960         int rc = 0, minor = iminor(inode);
961         struct tpm_chip *chip = NULL, *pos;
962
963         lock_kernel();
964         spin_lock(&driver_lock);
965
966         list_for_each_entry(pos, &tpm_chip_list, list) {
967                 if (pos->vendor.miscdev.minor == minor) {
968                         chip = pos;
969                         break;
970                 }
971         }
972
973         if (chip == NULL) {
974                 rc = -ENODEV;
975                 goto err_out;
976         }
977
978         if (chip->num_opens) {
979                 dev_dbg(chip->dev, "Another process owns this TPM\n");
980                 rc = -EBUSY;
981                 goto err_out;
982         }
983
984         chip->num_opens++;
985         get_device(chip->dev);
986
987         spin_unlock(&driver_lock);
988
989         chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
990         if (chip->data_buffer == NULL) {
991                 chip->num_opens--;
992                 put_device(chip->dev);
993                 unlock_kernel();
994                 return -ENOMEM;
995         }
996
997         atomic_set(&chip->data_pending, 0);
998
999         file->private_data = chip;
1000         unlock_kernel();
1001         return 0;
1002
1003 err_out:
1004         spin_unlock(&driver_lock);
1005         unlock_kernel();
1006         return rc;
1007 }
1008 EXPORT_SYMBOL_GPL(tpm_open);
1009
1010 int tpm_release(struct inode *inode, struct file *file)
1011 {
1012         struct tpm_chip *chip = file->private_data;
1013
1014         flush_scheduled_work();
1015         spin_lock(&driver_lock);
1016         file->private_data = NULL;
1017         del_singleshot_timer_sync(&chip->user_read_timer);
1018         atomic_set(&chip->data_pending, 0);
1019         chip->num_opens--;
1020         put_device(chip->dev);
1021         kfree(chip->data_buffer);
1022         spin_unlock(&driver_lock);
1023         return 0;
1024 }
1025 EXPORT_SYMBOL_GPL(tpm_release);
1026
1027 ssize_t tpm_write(struct file *file, const char __user *buf,
1028                   size_t size, loff_t *off)
1029 {
1030         struct tpm_chip *chip = file->private_data;
1031         size_t in_size = size, out_size;
1032
1033         /* cannot perform a write until the read has cleared
1034            either via tpm_read or a user_read_timer timeout */
1035         while (atomic_read(&chip->data_pending) != 0)
1036                 msleep(TPM_TIMEOUT);
1037
1038         mutex_lock(&chip->buffer_mutex);
1039
1040         if (in_size > TPM_BUFSIZE)
1041                 in_size = TPM_BUFSIZE;
1042
1043         if (copy_from_user
1044             (chip->data_buffer, (void __user *) buf, in_size)) {
1045                 mutex_unlock(&chip->buffer_mutex);
1046                 return -EFAULT;
1047         }
1048
1049         /* atomic tpm command send and result receive */
1050         out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1051
1052         atomic_set(&chip->data_pending, out_size);
1053         mutex_unlock(&chip->buffer_mutex);
1054
1055         /* Set a timeout by which the reader must come claim the result */
1056         mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1057
1058         return in_size;
1059 }
1060 EXPORT_SYMBOL_GPL(tpm_write);
1061
1062 ssize_t tpm_read(struct file *file, char __user *buf,
1063                  size_t size, loff_t *off)
1064 {
1065         struct tpm_chip *chip = file->private_data;
1066         ssize_t ret_size;
1067
1068         del_singleshot_timer_sync(&chip->user_read_timer);
1069         flush_scheduled_work();
1070         ret_size = atomic_read(&chip->data_pending);
1071         atomic_set(&chip->data_pending, 0);
1072         if (ret_size > 0) {     /* relay data */
1073                 if (size < ret_size)
1074                         ret_size = size;
1075
1076                 mutex_lock(&chip->buffer_mutex);
1077                 if (copy_to_user(buf, chip->data_buffer, ret_size))
1078                         ret_size = -EFAULT;
1079                 mutex_unlock(&chip->buffer_mutex);
1080         }
1081
1082         return ret_size;
1083 }
1084 EXPORT_SYMBOL_GPL(tpm_read);
1085
1086 void tpm_remove_hardware(struct device *dev)
1087 {
1088         struct tpm_chip *chip = dev_get_drvdata(dev);
1089
1090         if (chip == NULL) {
1091                 dev_err(dev, "No device data found\n");
1092                 return;
1093         }
1094
1095         spin_lock(&driver_lock);
1096
1097         list_del(&chip->list);
1098
1099         spin_unlock(&driver_lock);
1100
1101         misc_deregister(&chip->vendor.miscdev);
1102
1103         sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1104         tpm_bios_log_teardown(chip->bios_dir);
1105
1106         /* write it this way to be explicit (chip->dev == dev) */
1107         put_device(chip->dev);
1108 }
1109 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1110
1111 /*
1112  * We are about to suspend. Save the TPM state
1113  * so that it can be restored.
1114  */
1115 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1116 {
1117         struct tpm_chip *chip = dev_get_drvdata(dev);
1118         u8 savestate[] = {
1119                 0, 193,         /* TPM_TAG_RQU_COMMAND */
1120                 0, 0, 0, 10,    /* blob length (in bytes) */
1121                 0, 0, 0, 152    /* TPM_ORD_SaveState */
1122         };
1123
1124         if (chip == NULL)
1125                 return -ENODEV;
1126
1127         tpm_transmit(chip, savestate, sizeof(savestate));
1128         return 0;
1129 }
1130 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1131
1132 /*
1133  * Resume from a power safe. The BIOS already restored
1134  * the TPM state.
1135  */
1136 int tpm_pm_resume(struct device *dev)
1137 {
1138         struct tpm_chip *chip = dev_get_drvdata(dev);
1139
1140         if (chip == NULL)
1141                 return -ENODEV;
1142
1143         return 0;
1144 }
1145 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1146
1147 /*
1148  * Once all references to platform device are down to 0,
1149  * release all allocated structures.
1150  * In case vendor provided release function,
1151  * call it too.
1152  */
1153 static void tpm_dev_release(struct device *dev)
1154 {
1155         struct tpm_chip *chip = dev_get_drvdata(dev);
1156
1157         if (chip->vendor.release)
1158                 chip->vendor.release(dev);
1159
1160         chip->release(dev);
1161
1162         clear_bit(chip->dev_num, dev_mask);
1163         kfree(chip->vendor.miscdev.name);
1164         kfree(chip);
1165 }
1166
1167 /*
1168  * Called from tpm_<specific>.c probe function only for devices 
1169  * the driver has determined it should claim.  Prior to calling
1170  * this function the specific probe function has called pci_enable_device
1171  * upon errant exit from this function specific probe function should call
1172  * pci_disable_device
1173  */
1174 struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vendor_specific
1175                                        *entry)
1176 {
1177 #define DEVNAME_SIZE 7
1178
1179         char *devname;
1180         struct tpm_chip *chip;
1181
1182         /* Driver specific per-device data */
1183         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1184         devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1185
1186         if (chip == NULL || devname == NULL) {
1187                 kfree(chip);
1188                 kfree(devname);
1189                 return NULL;
1190         }
1191
1192         mutex_init(&chip->buffer_mutex);
1193         mutex_init(&chip->tpm_mutex);
1194         INIT_LIST_HEAD(&chip->list);
1195
1196         INIT_WORK(&chip->work, timeout_work);
1197
1198         setup_timer(&chip->user_read_timer, user_reader_timeout,
1199                         (unsigned long)chip);
1200
1201         memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1202
1203         chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1204
1205         if (chip->dev_num >= TPM_NUM_DEVICES) {
1206                 dev_err(dev, "No available tpm device numbers\n");
1207                 kfree(chip);
1208                 return NULL;
1209         } else if (chip->dev_num == 0)
1210                 chip->vendor.miscdev.minor = TPM_MINOR;
1211         else
1212                 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1213
1214         set_bit(chip->dev_num, dev_mask);
1215
1216         scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
1217         chip->vendor.miscdev.name = devname;
1218
1219         chip->vendor.miscdev.parent = dev;
1220         chip->dev = get_device(dev);
1221         chip->release = dev->release;
1222         dev->release = tpm_dev_release;
1223         dev_set_drvdata(dev, chip);
1224
1225         if (misc_register(&chip->vendor.miscdev)) {
1226                 dev_err(chip->dev,
1227                         "unable to misc_register %s, minor %d\n",
1228                         chip->vendor.miscdev.name,
1229                         chip->vendor.miscdev.minor);
1230                 put_device(chip->dev);
1231                 return NULL;
1232         }
1233
1234         spin_lock(&driver_lock);
1235
1236         list_add(&chip->list, &tpm_chip_list);
1237
1238         spin_unlock(&driver_lock);
1239
1240         if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1241                 list_del(&chip->list);
1242                 misc_deregister(&chip->vendor.miscdev);
1243                 put_device(chip->dev);
1244                 return NULL;
1245         }
1246
1247         chip->bios_dir = tpm_bios_log_setup(devname);
1248
1249         return chip;
1250 }
1251 EXPORT_SYMBOL_GPL(tpm_register_hardware);
1252
1253 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1254 MODULE_DESCRIPTION("TPM Driver");
1255 MODULE_VERSION("2.0");
1256 MODULE_LICENSE("GPL");