Linux 2.6.29
[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/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 = usecs_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 = usecs_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 = usecs_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 = usecs_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             usecs_to_jiffies(be32_to_cpu
558                              (*((__be32 *) (data +
559                                             TPM_GET_CAP_RET_UINT32_1_IDX))));
560         /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
561          * value wrong and apparently reports msecs rather than usecs. So we
562          * fix up the resulting too-small TPM_SHORT value to make things work.
563          */
564         if (chip->vendor.duration[TPM_SHORT] < (HZ/100))
565                 chip->vendor.duration[TPM_SHORT] = HZ;
566
567         chip->vendor.duration[TPM_MEDIUM] =
568             usecs_to_jiffies(be32_to_cpu
569                              (*((__be32 *) (data +
570                                             TPM_GET_CAP_RET_UINT32_2_IDX))));
571         chip->vendor.duration[TPM_LONG] =
572             usecs_to_jiffies(be32_to_cpu
573                              (*((__be32 *) (data +
574                                             TPM_GET_CAP_RET_UINT32_3_IDX))));
575 }
576 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
577
578 void tpm_continue_selftest(struct tpm_chip *chip)
579 {
580         u8 data[] = {
581                 0, 193,                 /* TPM_TAG_RQU_COMMAND */
582                 0, 0, 0, 10,            /* length */
583                 0, 0, 0, 83,            /* TPM_ORD_GetCapability */
584         };
585
586         tpm_transmit(chip, data, sizeof(data));
587 }
588 EXPORT_SYMBOL_GPL(tpm_continue_selftest);
589
590 #define  TPM_INTERNAL_RESULT_SIZE 200
591
592 ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
593                         char *buf)
594 {
595         u8 *data;
596         ssize_t rc;
597
598         struct tpm_chip *chip = dev_get_drvdata(dev);
599         if (chip == NULL)
600                 return -ENODEV;
601
602         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
603         if (!data)
604                 return -ENOMEM;
605
606         memcpy(data, tpm_cap, sizeof(tpm_cap));
607         data[TPM_CAP_IDX] = TPM_CAP_FLAG;
608         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
609
610         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
611                         "attemtping to determine the permanent enabled state");
612         if (rc) {
613                 kfree(data);
614                 return 0;
615         }
616
617         rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]);
618
619         kfree(data);
620         return rc;
621 }
622 EXPORT_SYMBOL_GPL(tpm_show_enabled);
623
624 ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
625                         char *buf)
626 {
627         u8 *data;
628         ssize_t rc;
629
630         struct tpm_chip *chip = dev_get_drvdata(dev);
631         if (chip == NULL)
632                 return -ENODEV;
633
634         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
635         if (!data)
636                 return -ENOMEM;
637
638         memcpy(data, tpm_cap, sizeof(tpm_cap));
639         data[TPM_CAP_IDX] = TPM_CAP_FLAG;
640         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
641
642         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
643                         "attemtping to determine the permanent active state");
644         if (rc) {
645                 kfree(data);
646                 return 0;
647         }
648
649         rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]);
650
651         kfree(data);
652         return rc;
653 }
654 EXPORT_SYMBOL_GPL(tpm_show_active);
655
656 ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
657                         char *buf)
658 {
659         u8 *data;
660         ssize_t rc;
661
662         struct tpm_chip *chip = dev_get_drvdata(dev);
663         if (chip == NULL)
664                 return -ENODEV;
665
666         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
667         if (!data)
668                 return -ENOMEM;
669
670         memcpy(data, tpm_cap, sizeof(tpm_cap));
671         data[TPM_CAP_IDX] = TPM_CAP_PROP;
672         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER;
673
674         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
675                         "attempting to determine the owner state");
676         if (rc) {
677                 kfree(data);
678                 return 0;
679         }
680
681         rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]);
682
683         kfree(data);
684         return rc;
685 }
686 EXPORT_SYMBOL_GPL(tpm_show_owned);
687
688 ssize_t tpm_show_temp_deactivated(struct device * dev,
689                                 struct device_attribute * attr, char *buf)
690 {
691         u8 *data;
692         ssize_t rc;
693
694         struct tpm_chip *chip = dev_get_drvdata(dev);
695         if (chip == NULL)
696                 return -ENODEV;
697
698         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
699         if (!data)
700                 return -ENOMEM;
701
702         memcpy(data, tpm_cap, sizeof(tpm_cap));
703         data[TPM_CAP_IDX] = TPM_CAP_FLAG;
704         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL;
705
706         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
707                         "attempting to determine the temporary state");
708         if (rc) {
709                 kfree(data);
710                 return 0;
711         }
712
713         rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]);
714
715         kfree(data);
716         return rc;
717 }
718 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
719
720 static const u8 pcrread[] = {
721         0, 193,                 /* TPM_TAG_RQU_COMMAND */
722         0, 0, 0, 14,            /* length */
723         0, 0, 0, 21,            /* TPM_ORD_PcrRead */
724         0, 0, 0, 0              /* PCR index */
725 };
726
727 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
728                       char *buf)
729 {
730         u8 *data;
731         ssize_t rc;
732         int i, j, num_pcrs;
733         __be32 index;
734         char *str = buf;
735
736         struct tpm_chip *chip = dev_get_drvdata(dev);
737         if (chip == NULL)
738                 return -ENODEV;
739
740         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
741         if (!data)
742                 return -ENOMEM;
743
744         memcpy(data, tpm_cap, sizeof(tpm_cap));
745         data[TPM_CAP_IDX] = TPM_CAP_PROP;
746         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR;
747
748         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
749                         "attempting to determine the number of PCRS");
750         if (rc) {
751                 kfree(data);
752                 return 0;
753         }
754
755         num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));
756         for (i = 0; i < num_pcrs; i++) {
757                 memcpy(data, pcrread, sizeof(pcrread));
758                 index = cpu_to_be32(i);
759                 memcpy(data + 10, &index, 4);
760                 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
761                                 "attempting to read a PCR");
762                 if (rc)
763                         goto out;
764                 str += sprintf(str, "PCR-%02d: ", i);
765                 for (j = 0; j < TPM_DIGEST_SIZE; j++)
766                         str += sprintf(str, "%02X ", *(data + 10 + j));
767                 str += sprintf(str, "\n");
768         }
769 out:
770         kfree(data);
771         return str - buf;
772 }
773 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
774
775 #define  READ_PUBEK_RESULT_SIZE 314
776 static const u8 readpubek[] = {
777         0, 193,                 /* TPM_TAG_RQU_COMMAND */
778         0, 0, 0, 30,            /* length */
779         0, 0, 0, 124,           /* TPM_ORD_ReadPubek */
780 };
781
782 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
783                        char *buf)
784 {
785         u8 *data;
786         ssize_t err;
787         int i, rc;
788         char *str = buf;
789
790         struct tpm_chip *chip = dev_get_drvdata(dev);
791         if (chip == NULL)
792                 return -ENODEV;
793
794         data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);
795         if (!data)
796                 return -ENOMEM;
797
798         memcpy(data, readpubek, sizeof(readpubek));
799
800         err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE,
801                         "attempting to read the PUBEK");
802         if (err)
803                 goto out;
804
805         /* 
806            ignore header 10 bytes
807            algorithm 32 bits (1 == RSA )
808            encscheme 16 bits
809            sigscheme 16 bits
810            parameters (RSA 12->bytes: keybit, #primes, expbit)  
811            keylenbytes 32 bits
812            256 byte modulus
813            ignore checksum 20 bytes
814          */
815
816         str +=
817             sprintf(str,
818                     "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
819                     "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
820                     " %02X %02X %02X %02X %02X %02X %02X %02X\n"
821                     "Modulus length: %d\nModulus: \n",
822                     data[10], data[11], data[12], data[13], data[14],
823                     data[15], data[16], data[17], data[22], data[23],
824                     data[24], data[25], data[26], data[27], data[28],
825                     data[29], data[30], data[31], data[32], data[33],
826                     be32_to_cpu(*((__be32 *) (data + 34))));
827
828         for (i = 0; i < 256; i++) {
829                 str += sprintf(str, "%02X ", data[i + 38]);
830                 if ((i + 1) % 16 == 0)
831                         str += sprintf(str, "\n");
832         }
833 out:
834         rc = str - buf;
835         kfree(data);
836         return rc;
837 }
838 EXPORT_SYMBOL_GPL(tpm_show_pubek);
839
840 #define CAP_VERSION_1_1 6
841 #define CAP_VERSION_1_2 0x1A
842 #define CAP_VERSION_IDX 13
843 static const u8 cap_version[] = {
844         0, 193,                 /* TPM_TAG_RQU_COMMAND */
845         0, 0, 0, 18,            /* length */
846         0, 0, 0, 101,           /* TPM_ORD_GetCapability */
847         0, 0, 0, 0,
848         0, 0, 0, 0
849 };
850
851 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
852                       char *buf)
853 {
854         u8 *data;
855         ssize_t rc;
856         char *str = buf;
857
858         struct tpm_chip *chip = dev_get_drvdata(dev);
859         if (chip == NULL)
860                 return -ENODEV;
861
862         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
863         if (!data)
864                 return -ENOMEM;
865
866         memcpy(data, tpm_cap, sizeof(tpm_cap));
867         data[TPM_CAP_IDX] = TPM_CAP_PROP;
868         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
869
870         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
871                         "attempting to determine the manufacturer");
872         if (rc) {
873                 kfree(data);
874                 return 0;
875         }
876
877         str += sprintf(str, "Manufacturer: 0x%x\n",
878                        be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
879
880         memcpy(data, cap_version, sizeof(cap_version));
881         data[CAP_VERSION_IDX] = CAP_VERSION_1_1;
882         rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
883                         "attempting to determine the 1.1 version");
884         if (rc)
885                 goto out;
886
887         str += sprintf(str,
888                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
889                        (int) data[14], (int) data[15], (int) data[16],
890                        (int) data[17]);
891
892 out:
893         kfree(data);
894         return str - buf;
895 }
896 EXPORT_SYMBOL_GPL(tpm_show_caps);
897
898 ssize_t tpm_show_caps_1_2(struct device * dev,
899                           struct device_attribute * attr, char *buf)
900 {
901         u8 *data;
902         ssize_t len;
903         char *str = buf;
904
905         struct tpm_chip *chip = dev_get_drvdata(dev);
906         if (chip == NULL)
907                 return -ENODEV;
908
909         data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
910         if (!data)
911                 return -ENOMEM;
912
913         memcpy(data, tpm_cap, sizeof(tpm_cap));
914         data[TPM_CAP_IDX] = TPM_CAP_PROP;
915         data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
916
917         len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE);
918         if (len <= TPM_ERROR_SIZE) {
919                 dev_dbg(chip->dev, "A TPM error (%d) occurred "
920                         "attempting to determine the manufacturer\n",
921                         be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
922                 kfree(data);
923                 return 0;
924         }
925
926         str += sprintf(str, "Manufacturer: 0x%x\n",
927                        be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
928
929         memcpy(data, cap_version, sizeof(cap_version));
930         data[CAP_VERSION_IDX] = CAP_VERSION_1_2;
931
932         len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE);
933         if (len <= TPM_ERROR_SIZE) {
934                 dev_err(chip->dev, "A TPM error (%d) occurred "
935                         "attempting to determine the 1.2 version\n",
936                         be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
937                 goto out;
938         }
939         str += sprintf(str,
940                        "TCG version: %d.%d\nFirmware version: %d.%d\n",
941                        (int) data[16], (int) data[17], (int) data[18],
942                        (int) data[19]);
943
944 out:
945         kfree(data);
946         return str - buf;
947 }
948 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
949
950 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
951                         const char *buf, size_t count)
952 {
953         struct tpm_chip *chip = dev_get_drvdata(dev);
954         if (chip == NULL)
955                 return 0;
956
957         chip->vendor.cancel(chip);
958         return count;
959 }
960 EXPORT_SYMBOL_GPL(tpm_store_cancel);
961
962 /*
963  * Device file system interface to the TPM
964  *
965  * It's assured that the chip will be opened just once,
966  * by the check of is_open variable, which is protected
967  * by driver_lock.
968  */
969 int tpm_open(struct inode *inode, struct file *file)
970 {
971         int minor = iminor(inode);
972         struct tpm_chip *chip = NULL, *pos;
973
974         rcu_read_lock();
975         list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
976                 if (pos->vendor.miscdev.minor == minor) {
977                         chip = pos;
978                         get_device(chip->dev);
979                         break;
980                 }
981         }
982         rcu_read_unlock();
983
984         if (!chip)
985                 return -ENODEV;
986
987         if (test_and_set_bit(0, &chip->is_open)) {
988                 dev_dbg(chip->dev, "Another process owns this TPM\n");
989                 put_device(chip->dev);
990                 return -EBUSY;
991         }
992
993         chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
994         if (chip->data_buffer == NULL) {
995                 clear_bit(0, &chip->is_open);
996                 put_device(chip->dev);
997                 return -ENOMEM;
998         }
999
1000         atomic_set(&chip->data_pending, 0);
1001
1002         file->private_data = chip;
1003         return 0;
1004 }
1005 EXPORT_SYMBOL_GPL(tpm_open);
1006
1007 /*
1008  * Called on file close
1009  */
1010 int tpm_release(struct inode *inode, struct file *file)
1011 {
1012         struct tpm_chip *chip = file->private_data;
1013
1014         del_singleshot_timer_sync(&chip->user_read_timer);
1015         flush_scheduled_work();
1016         file->private_data = NULL;
1017         atomic_set(&chip->data_pending, 0);
1018         kfree(chip->data_buffer);
1019         clear_bit(0, &chip->is_open);
1020         put_device(chip->dev);
1021         return 0;
1022 }
1023 EXPORT_SYMBOL_GPL(tpm_release);
1024
1025 ssize_t tpm_write(struct file *file, const char __user *buf,
1026                   size_t size, loff_t *off)
1027 {
1028         struct tpm_chip *chip = file->private_data;
1029         size_t in_size = size, out_size;
1030
1031         /* cannot perform a write until the read has cleared
1032            either via tpm_read or a user_read_timer timeout */
1033         while (atomic_read(&chip->data_pending) != 0)
1034                 msleep(TPM_TIMEOUT);
1035
1036         mutex_lock(&chip->buffer_mutex);
1037
1038         if (in_size > TPM_BUFSIZE)
1039                 in_size = TPM_BUFSIZE;
1040
1041         if (copy_from_user
1042             (chip->data_buffer, (void __user *) buf, in_size)) {
1043                 mutex_unlock(&chip->buffer_mutex);
1044                 return -EFAULT;
1045         }
1046
1047         /* atomic tpm command send and result receive */
1048         out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1049
1050         atomic_set(&chip->data_pending, out_size);
1051         mutex_unlock(&chip->buffer_mutex);
1052
1053         /* Set a timeout by which the reader must come claim the result */
1054         mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1055
1056         return in_size;
1057 }
1058 EXPORT_SYMBOL_GPL(tpm_write);
1059
1060 ssize_t tpm_read(struct file *file, char __user *buf,
1061                  size_t size, loff_t *off)
1062 {
1063         struct tpm_chip *chip = file->private_data;
1064         ssize_t ret_size;
1065
1066         del_singleshot_timer_sync(&chip->user_read_timer);
1067         flush_scheduled_work();
1068         ret_size = atomic_read(&chip->data_pending);
1069         atomic_set(&chip->data_pending, 0);
1070         if (ret_size > 0) {     /* relay data */
1071                 if (size < ret_size)
1072                         ret_size = size;
1073
1074                 mutex_lock(&chip->buffer_mutex);
1075                 if (copy_to_user(buf, chip->data_buffer, ret_size))
1076                         ret_size = -EFAULT;
1077                 mutex_unlock(&chip->buffer_mutex);
1078         }
1079
1080         return ret_size;
1081 }
1082 EXPORT_SYMBOL_GPL(tpm_read);
1083
1084 void tpm_remove_hardware(struct device *dev)
1085 {
1086         struct tpm_chip *chip = dev_get_drvdata(dev);
1087
1088         if (chip == NULL) {
1089                 dev_err(dev, "No device data found\n");
1090                 return;
1091         }
1092
1093         spin_lock(&driver_lock);
1094         list_del_rcu(&chip->list);
1095         spin_unlock(&driver_lock);
1096         synchronize_rcu();
1097
1098         misc_deregister(&chip->vendor.miscdev);
1099         sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1100         tpm_bios_log_teardown(chip->bios_dir);
1101
1102         /* write it this way to be explicit (chip->dev == dev) */
1103         put_device(chip->dev);
1104 }
1105 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1106
1107 /*
1108  * We are about to suspend. Save the TPM state
1109  * so that it can be restored.
1110  */
1111 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1112 {
1113         struct tpm_chip *chip = dev_get_drvdata(dev);
1114         u8 savestate[] = {
1115                 0, 193,         /* TPM_TAG_RQU_COMMAND */
1116                 0, 0, 0, 10,    /* blob length (in bytes) */
1117                 0, 0, 0, 152    /* TPM_ORD_SaveState */
1118         };
1119
1120         if (chip == NULL)
1121                 return -ENODEV;
1122
1123         tpm_transmit(chip, savestate, sizeof(savestate));
1124         return 0;
1125 }
1126 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1127
1128 /*
1129  * Resume from a power safe. The BIOS already restored
1130  * the TPM state.
1131  */
1132 int tpm_pm_resume(struct device *dev)
1133 {
1134         struct tpm_chip *chip = dev_get_drvdata(dev);
1135
1136         if (chip == NULL)
1137                 return -ENODEV;
1138
1139         return 0;
1140 }
1141 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1142
1143 /* In case vendor provided release function, call it too.*/
1144
1145 void tpm_dev_vendor_release(struct tpm_chip *chip)
1146 {
1147         if (chip->vendor.release)
1148                 chip->vendor.release(chip->dev);
1149
1150         clear_bit(chip->dev_num, dev_mask);
1151         kfree(chip->vendor.miscdev.name);
1152 }
1153 EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1154
1155
1156 /*
1157  * Once all references to platform device are down to 0,
1158  * release all allocated structures.
1159  */
1160 void tpm_dev_release(struct device *dev)
1161 {
1162         struct tpm_chip *chip = dev_get_drvdata(dev);
1163
1164         tpm_dev_vendor_release(chip);
1165
1166         chip->release(dev);
1167         kfree(chip);
1168 }
1169 EXPORT_SYMBOL_GPL(tpm_dev_release);
1170
1171 /*
1172  * Called from tpm_<specific>.c probe function only for devices 
1173  * the driver has determined it should claim.  Prior to calling
1174  * this function the specific probe function has called pci_enable_device
1175  * upon errant exit from this function specific probe function should call
1176  * pci_disable_device
1177  */
1178 struct tpm_chip *tpm_register_hardware(struct device *dev,
1179                                         const struct tpm_vendor_specific *entry)
1180 {
1181 #define DEVNAME_SIZE 7
1182
1183         char *devname;
1184         struct tpm_chip *chip;
1185
1186         /* Driver specific per-device data */
1187         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1188         devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1189
1190         if (chip == NULL || devname == NULL)
1191                 goto out_free;
1192
1193         mutex_init(&chip->buffer_mutex);
1194         mutex_init(&chip->tpm_mutex);
1195         INIT_LIST_HEAD(&chip->list);
1196
1197         INIT_WORK(&chip->work, timeout_work);
1198
1199         setup_timer(&chip->user_read_timer, user_reader_timeout,
1200                         (unsigned long)chip);
1201
1202         memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1203
1204         chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1205
1206         if (chip->dev_num >= TPM_NUM_DEVICES) {
1207                 dev_err(dev, "No available tpm device numbers\n");
1208                 goto out_free;
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         if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1235                 misc_deregister(&chip->vendor.miscdev);
1236                 put_device(chip->dev);
1237
1238                 return NULL;
1239         }
1240
1241         chip->bios_dir = tpm_bios_log_setup(devname);
1242
1243         /* Make chip available */
1244         spin_lock(&driver_lock);
1245         list_add_rcu(&chip->list, &tpm_chip_list);
1246         spin_unlock(&driver_lock);
1247
1248         return chip;
1249
1250 out_free:
1251         kfree(chip);
1252         kfree(devname);
1253         return NULL;
1254 }
1255 EXPORT_SYMBOL_GPL(tpm_register_hardware);
1256
1257 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1258 MODULE_DESCRIPTION("TPM Driver");
1259 MODULE_VERSION("2.0");
1260 MODULE_LICENSE("GPL");