Commit | Line | Data |
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1da177e4 LT |
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 | * | |
8e81cc13 | 10 | * Maintained by: <tpmdd-devel@lists.sourceforge.net> |
1da177e4 LT |
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 | |
700d8bdc | 22 | * calls to msleep. |
1da177e4 LT |
23 | * |
24 | */ | |
25 | ||
1da177e4 | 26 | #include <linux/poll.h> |
d081d470 | 27 | #include <linux/mutex.h> |
1da177e4 | 28 | #include <linux/spinlock.h> |
25368ca5 | 29 | #include <linux/smp_lock.h> |
d081d470 | 30 | |
1da177e4 LT |
31 | #include "tpm.h" |
32 | ||
3122a88a KH |
33 | enum tpm_const { |
34 | TPM_MINOR = 224, /* officially assigned */ | |
35 | TPM_BUFSIZE = 2048, | |
36 | TPM_NUM_DEVICES = 256, | |
3122a88a | 37 | }; |
1da177e4 | 38 | |
9e18ee19 KJH |
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 | ||
1da177e4 LT |
50 | static LIST_HEAD(tpm_chip_list); |
51 | static DEFINE_SPINLOCK(driver_lock); | |
10685a95 | 52 | static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES); |
1da177e4 | 53 | |
9e18ee19 KJH |
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 | ||
1da177e4 LT |
323 | static void user_reader_timeout(unsigned long ptr) |
324 | { | |
325 | struct tpm_chip *chip = (struct tpm_chip *) ptr; | |
326 | ||
09e12f9f KJH |
327 | schedule_work(&chip->work); |
328 | } | |
329 | ||
c4028958 | 330 | static void timeout_work(struct work_struct *work) |
09e12f9f | 331 | { |
c4028958 | 332 | struct tpm_chip *chip = container_of(work, struct tpm_chip, work); |
09e12f9f | 333 | |
d081d470 | 334 | mutex_lock(&chip->buffer_mutex); |
1da177e4 LT |
335 | atomic_set(&chip->data_pending, 0); |
336 | memset(chip->data_buffer, 0, TPM_BUFSIZE); | |
d081d470 | 337 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
338 | } |
339 | ||
9e18ee19 KJH |
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) | |
36b20020 | 358 | duration = chip->vendor.duration[duration_idx]; |
9e18ee19 KJH |
359 | if (duration <= 0) |
360 | return 2 * 60 * HZ; | |
361 | else | |
362 | return duration; | |
363 | } | |
364 | EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration); | |
365 | ||
1da177e4 LT |
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 | { | |
d9e5b6bf | 372 | ssize_t rc; |
9e18ee19 | 373 | u32 count, ordinal; |
700d8bdc | 374 | unsigned long stop; |
1da177e4 | 375 | |
81179bb6 | 376 | count = be32_to_cpu(*((__be32 *) (buf + 2))); |
9e18ee19 | 377 | ordinal = be32_to_cpu(*((__be32 *) (buf + 6))); |
1da177e4 LT |
378 | if (count == 0) |
379 | return -ENODATA; | |
380 | if (count > bufsiz) { | |
e659a3fe | 381 | dev_err(chip->dev, |
b76be681 | 382 | "invalid count value %x %zx \n", count, bufsiz); |
1da177e4 LT |
383 | return -E2BIG; |
384 | } | |
385 | ||
d081d470 | 386 | mutex_lock(&chip->tpm_mutex); |
1da177e4 | 387 | |
90dda520 | 388 | if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) { |
e659a3fe | 389 | dev_err(chip->dev, |
d9e5b6bf KH |
390 | "tpm_transmit: tpm_send: error %zd\n", rc); |
391 | goto out; | |
1da177e4 LT |
392 | } |
393 | ||
27084efe LD |
394 | if (chip->vendor.irq) |
395 | goto out_recv; | |
396 | ||
9e18ee19 | 397 | stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal); |
1da177e4 | 398 | do { |
90dda520 KJH |
399 | u8 status = chip->vendor.status(chip); |
400 | if ((status & chip->vendor.req_complete_mask) == | |
401 | chip->vendor.req_complete_val) | |
1da177e4 | 402 | goto out_recv; |
d9e5b6bf | 403 | |
90dda520 | 404 | if ((status == chip->vendor.req_canceled)) { |
e659a3fe | 405 | dev_err(chip->dev, "Operation Canceled\n"); |
d9e5b6bf KH |
406 | rc = -ECANCELED; |
407 | goto out; | |
408 | } | |
409 | ||
410 | msleep(TPM_TIMEOUT); /* CHECK */ | |
1da177e4 | 411 | rmb(); |
700d8bdc | 412 | } while (time_before(jiffies, stop)); |
1da177e4 | 413 | |
90dda520 | 414 | chip->vendor.cancel(chip); |
e659a3fe | 415 | dev_err(chip->dev, "Operation Timed out\n"); |
d9e5b6bf KH |
416 | rc = -ETIME; |
417 | goto out; | |
1da177e4 LT |
418 | |
419 | out_recv: | |
90dda520 | 420 | rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz); |
d9e5b6bf | 421 | if (rc < 0) |
e659a3fe | 422 | dev_err(chip->dev, |
d9e5b6bf KH |
423 | "tpm_transmit: tpm_recv: error %zd\n", rc); |
424 | out: | |
d081d470 | 425 | mutex_unlock(&chip->tpm_mutex); |
d9e5b6bf | 426 | return rc; |
1da177e4 LT |
427 | } |
428 | ||
429 | #define TPM_DIGEST_SIZE 20 | |
beed53a1 KJH |
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 | |
08e96e48 KJH |
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 | |
beed53a1 KJH |
441 | |
442 | #define TPM_CAP_IDX 13 | |
443 | #define TPM_CAP_SUBCAP_IDX 21 | |
444 | ||
445 | enum tpm_capabilities { | |
08e96e48 | 446 | TPM_CAP_FLAG = 4, |
beed53a1 KJH |
447 | TPM_CAP_PROP = 5, |
448 | }; | |
449 | ||
450 | enum tpm_sub_capabilities { | |
451 | TPM_CAP_PROP_PCR = 0x1, | |
452 | TPM_CAP_PROP_MANUFACTURER = 0x3, | |
08e96e48 KJH |
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, | |
beed53a1 KJH |
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[] = { | |
1da177e4 LT |
467 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
468 | 0, 0, 0, 22, /* length */ | |
469 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
beed53a1 KJH |
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> */ | |
1da177e4 LT |
473 | }; |
474 | ||
beed53a1 KJH |
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 | ||
08e96e48 KJH |
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) | |
9e5b1b12 | 528 | chip->vendor.timeout_a = usecs_to_jiffies(timeout); |
08e96e48 KJH |
529 | timeout = |
530 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX))); | |
531 | if (timeout) | |
9e5b1b12 | 532 | chip->vendor.timeout_b = usecs_to_jiffies(timeout); |
08e96e48 KJH |
533 | timeout = |
534 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX))); | |
535 | if (timeout) | |
9e5b1b12 | 536 | chip->vendor.timeout_c = usecs_to_jiffies(timeout); |
08e96e48 KJH |
537 | timeout = |
538 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX))); | |
539 | if (timeout) | |
9e5b1b12 | 540 | chip->vendor.timeout_d = usecs_to_jiffies(timeout); |
08e96e48 KJH |
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] = | |
9e5b1b12 | 557 | usecs_to_jiffies(be32_to_cpu |
36b20020 KJH |
558 | (*((__be32 *) (data + |
559 | TPM_GET_CAP_RET_UINT32_1_IDX)))); | |
292cf4a8 VK |
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 | ||
08e96e48 | 567 | chip->vendor.duration[TPM_MEDIUM] = |
9e5b1b12 | 568 | usecs_to_jiffies(be32_to_cpu |
36b20020 KJH |
569 | (*((__be32 *) (data + |
570 | TPM_GET_CAP_RET_UINT32_2_IDX)))); | |
08e96e48 | 571 | chip->vendor.duration[TPM_LONG] = |
9e5b1b12 | 572 | usecs_to_jiffies(be32_to_cpu |
36b20020 KJH |
573 | (*((__be32 *) (data + |
574 | TPM_GET_CAP_RET_UINT32_3_IDX)))); | |
08e96e48 KJH |
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 | ||
ec288bd3 MO |
590 | #define TPM_INTERNAL_RESULT_SIZE 200 |
591 | ||
08e96e48 KJH |
592 | ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr, |
593 | char *buf) | |
594 | { | |
ec288bd3 | 595 | u8 *data; |
08e96e48 KJH |
596 | ssize_t rc; |
597 | ||
598 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
599 | if (chip == NULL) | |
600 | return -ENODEV; | |
601 | ||
ec288bd3 MO |
602 | data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL); |
603 | if (!data) | |
604 | return -ENOMEM; | |
605 | ||
08e96e48 KJH |
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 | ||
ec288bd3 MO |
610 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
611 | "attemtping to determine the permanent enabled state"); | |
612 | if (rc) { | |
613 | kfree(data); | |
08e96e48 | 614 | return 0; |
ec288bd3 MO |
615 | } |
616 | ||
617 | rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]); | |
618 | ||
619 | kfree(data); | |
620 | return rc; | |
08e96e48 KJH |
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 | { | |
ec288bd3 | 627 | u8 *data; |
08e96e48 KJH |
628 | ssize_t rc; |
629 | ||
630 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
631 | if (chip == NULL) | |
632 | return -ENODEV; | |
633 | ||
ec288bd3 MO |
634 | data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL); |
635 | if (!data) | |
636 | return -ENOMEM; | |
637 | ||
08e96e48 KJH |
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 | ||
ec288bd3 MO |
642 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
643 | "attemtping to determine the permanent active state"); | |
644 | if (rc) { | |
645 | kfree(data); | |
08e96e48 | 646 | return 0; |
ec288bd3 MO |
647 | } |
648 | ||
649 | rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]); | |
650 | ||
651 | kfree(data); | |
652 | return rc; | |
08e96e48 KJH |
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 | { | |
ec288bd3 | 659 | u8 *data; |
08e96e48 KJH |
660 | ssize_t rc; |
661 | ||
662 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
663 | if (chip == NULL) | |
664 | return -ENODEV; | |
665 | ||
ec288bd3 MO |
666 | data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL); |
667 | if (!data) | |
668 | return -ENOMEM; | |
669 | ||
08e96e48 KJH |
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 | ||
ec288bd3 | 674 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
08e96e48 | 675 | "attempting to determine the owner state"); |
ec288bd3 MO |
676 | if (rc) { |
677 | kfree(data); | |
08e96e48 | 678 | return 0; |
ec288bd3 MO |
679 | } |
680 | ||
681 | rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]); | |
682 | ||
683 | kfree(data); | |
684 | return rc; | |
08e96e48 KJH |
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 | { | |
ec288bd3 | 691 | u8 *data; |
08e96e48 KJH |
692 | ssize_t rc; |
693 | ||
694 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
695 | if (chip == NULL) | |
696 | return -ENODEV; | |
697 | ||
ec288bd3 MO |
698 | data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL); |
699 | if (!data) | |
700 | return -ENOMEM; | |
701 | ||
08e96e48 KJH |
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 | ||
ec288bd3 | 706 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
08e96e48 | 707 | "attempting to determine the temporary state"); |
ec288bd3 MO |
708 | if (rc) { |
709 | kfree(data); | |
08e96e48 | 710 | return 0; |
ec288bd3 MO |
711 | } |
712 | ||
713 | rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]); | |
714 | ||
715 | kfree(data); | |
716 | return rc; | |
08e96e48 KJH |
717 | } |
718 | EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated); | |
719 | ||
dff37e4b | 720 | static const u8 pcrread[] = { |
1da177e4 LT |
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 | ||
6659ca2a KH |
727 | ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr, |
728 | char *buf) | |
1da177e4 | 729 | { |
ec288bd3 | 730 | u8 *data; |
beed53a1 | 731 | ssize_t rc; |
81179bb6 KH |
732 | int i, j, num_pcrs; |
733 | __be32 index; | |
1da177e4 LT |
734 | char *str = buf; |
735 | ||
e659a3fe | 736 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
737 | if (chip == NULL) |
738 | return -ENODEV; | |
739 | ||
ec288bd3 MO |
740 | data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL); |
741 | if (!data) | |
742 | return -ENOMEM; | |
743 | ||
beed53a1 KJH |
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 | ||
ec288bd3 | 748 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
beed53a1 | 749 | "attempting to determine the number of PCRS"); |
ec288bd3 MO |
750 | if (rc) { |
751 | kfree(data); | |
e234bc97 | 752 | return 0; |
ec288bd3 | 753 | } |
1da177e4 | 754 | |
81179bb6 | 755 | num_pcrs = be32_to_cpu(*((__be32 *) (data + 14))); |
1da177e4 LT |
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); | |
ec288bd3 | 760 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
beed53a1 KJH |
761 | "attempting to read a PCR"); |
762 | if (rc) | |
e234bc97 | 763 | goto out; |
1da177e4 LT |
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 | } | |
e234bc97 | 769 | out: |
ec288bd3 | 770 | kfree(data); |
1da177e4 LT |
771 | return str - buf; |
772 | } | |
6659ca2a | 773 | EXPORT_SYMBOL_GPL(tpm_show_pcrs); |
1da177e4 LT |
774 | |
775 | #define READ_PUBEK_RESULT_SIZE 314 | |
dff37e4b | 776 | static const u8 readpubek[] = { |
1da177e4 LT |
777 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
778 | 0, 0, 0, 30, /* length */ | |
779 | 0, 0, 0, 124, /* TPM_ORD_ReadPubek */ | |
780 | }; | |
781 | ||
6659ca2a KH |
782 | ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr, |
783 | char *buf) | |
1da177e4 | 784 | { |
2df7111f | 785 | u8 *data; |
beed53a1 | 786 | ssize_t err; |
81179bb6 | 787 | int i, rc; |
1da177e4 LT |
788 | char *str = buf; |
789 | ||
e659a3fe | 790 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
791 | if (chip == NULL) |
792 | return -ENODEV; | |
793 | ||
b888c87b | 794 | data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL); |
2df7111f KH |
795 | if (!data) |
796 | return -ENOMEM; | |
797 | ||
1da177e4 | 798 | memcpy(data, readpubek, sizeof(readpubek)); |
1da177e4 | 799 | |
beed53a1 KJH |
800 | err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE, |
801 | "attempting to read the PUBEK"); | |
802 | if (err) | |
34d6e075 | 803 | goto out; |
1da177e4 LT |
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 | ||
1da177e4 LT |
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], | |
1dda8abe | 826 | be32_to_cpu(*((__be32 *) (data + 34)))); |
1da177e4 LT |
827 | |
828 | for (i = 0; i < 256; i++) { | |
1dda8abe | 829 | str += sprintf(str, "%02X ", data[i + 38]); |
1da177e4 LT |
830 | if ((i + 1) % 16 == 0) |
831 | str += sprintf(str, "\n"); | |
832 | } | |
34d6e075 | 833 | out: |
beed53a1 | 834 | rc = str - buf; |
2df7111f KH |
835 | kfree(data); |
836 | return rc; | |
1da177e4 | 837 | } |
6659ca2a | 838 | EXPORT_SYMBOL_GPL(tpm_show_pubek); |
1da177e4 | 839 | |
beed53a1 | 840 | #define CAP_VERSION_1_1 6 |
08e96e48 | 841 | #define CAP_VERSION_1_2 0x1A |
beed53a1 | 842 | #define CAP_VERSION_IDX 13 |
dff37e4b | 843 | static const u8 cap_version[] = { |
1da177e4 LT |
844 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
845 | 0, 0, 0, 18, /* length */ | |
846 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
beed53a1 | 847 | 0, 0, 0, 0, |
1da177e4 LT |
848 | 0, 0, 0, 0 |
849 | }; | |
850 | ||
6659ca2a KH |
851 | ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr, |
852 | char *buf) | |
1da177e4 | 853 | { |
ec288bd3 | 854 | u8 *data; |
beed53a1 | 855 | ssize_t rc; |
1da177e4 LT |
856 | char *str = buf; |
857 | ||
e659a3fe | 858 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
859 | if (chip == NULL) |
860 | return -ENODEV; | |
861 | ||
ec288bd3 MO |
862 | data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL); |
863 | if (!data) | |
864 | return -ENOMEM; | |
865 | ||
beed53a1 KJH |
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; | |
1da177e4 | 869 | |
ec288bd3 | 870 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
beed53a1 | 871 | "attempting to determine the manufacturer"); |
ec288bd3 MO |
872 | if (rc) { |
873 | kfree(data); | |
beed53a1 | 874 | return 0; |
ec288bd3 | 875 | } |
1da177e4 LT |
876 | |
877 | str += sprintf(str, "Manufacturer: 0x%x\n", | |
beed53a1 | 878 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)))); |
1da177e4 LT |
879 | |
880 | memcpy(data, cap_version, sizeof(cap_version)); | |
beed53a1 | 881 | data[CAP_VERSION_IDX] = CAP_VERSION_1_1; |
ec288bd3 | 882 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
beed53a1 KJH |
883 | "attempting to determine the 1.1 version"); |
884 | if (rc) | |
885 | goto out; | |
1da177e4 | 886 | |
beed53a1 KJH |
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]); | |
1da177e4 | 891 | |
beed53a1 | 892 | out: |
ec288bd3 | 893 | kfree(data); |
1da177e4 LT |
894 | return str - buf; |
895 | } | |
6659ca2a KH |
896 | EXPORT_SYMBOL_GPL(tpm_show_caps); |
897 | ||
08e96e48 KJH |
898 | ssize_t tpm_show_caps_1_2(struct device * dev, |
899 | struct device_attribute * attr, char *buf) | |
900 | { | |
ec288bd3 | 901 | u8 *data; |
08e96e48 KJH |
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 | ||
ec288bd3 MO |
909 | data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL); |
910 | if (!data) | |
911 | return -ENOMEM; | |
912 | ||
08e96e48 KJH |
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 | ||
ec288bd3 MO |
917 | len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE); |
918 | if (len <= TPM_ERROR_SIZE) { | |
08e96e48 KJH |
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)))); | |
ec288bd3 | 922 | kfree(data); |
08e96e48 KJH |
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 | ||
ec288bd3 MO |
932 | len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE); |
933 | if (len <= TPM_ERROR_SIZE) { | |
08e96e48 KJH |
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: | |
ec288bd3 | 945 | kfree(data); |
08e96e48 KJH |
946 | return str - buf; |
947 | } | |
948 | EXPORT_SYMBOL_GPL(tpm_show_caps_1_2); | |
949 | ||
6659ca2a KH |
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 | ||
90dda520 | 957 | chip->vendor.cancel(chip); |
6659ca2a KH |
958 | return count; |
959 | } | |
960 | EXPORT_SYMBOL_GPL(tpm_store_cancel); | |
1da177e4 | 961 | |
1da177e4 LT |
962 | /* |
963 | * Device file system interface to the TPM | |
f89c5edb RA |
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. | |
1da177e4 LT |
968 | */ |
969 | int tpm_open(struct inode *inode, struct file *file) | |
970 | { | |
f02a9364 | 971 | int minor = iminor(inode); |
1da177e4 LT |
972 | struct tpm_chip *chip = NULL, *pos; |
973 | ||
f02a9364 RA |
974 | rcu_read_lock(); |
975 | list_for_each_entry_rcu(pos, &tpm_chip_list, list) { | |
90dda520 | 976 | if (pos->vendor.miscdev.minor == minor) { |
1da177e4 | 977 | chip = pos; |
f02a9364 | 978 | get_device(chip->dev); |
1da177e4 LT |
979 | break; |
980 | } | |
981 | } | |
f02a9364 | 982 | rcu_read_unlock(); |
1da177e4 | 983 | |
f02a9364 RA |
984 | if (!chip) |
985 | return -ENODEV; | |
1da177e4 | 986 | |
dc36d32c | 987 | if (test_and_set_bit(0, &chip->is_open)) { |
b888c87b | 988 | dev_dbg(chip->dev, "Another process owns this TPM\n"); |
f02a9364 RA |
989 | put_device(chip->dev); |
990 | return -EBUSY; | |
1da177e4 LT |
991 | } |
992 | ||
1da177e4 LT |
993 | chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); |
994 | if (chip->data_buffer == NULL) { | |
dc36d32c | 995 | clear_bit(0, &chip->is_open); |
e659a3fe | 996 | put_device(chip->dev); |
1da177e4 LT |
997 | return -ENOMEM; |
998 | } | |
999 | ||
1000 | atomic_set(&chip->data_pending, 0); | |
1001 | ||
1002 | file->private_data = chip; | |
1003 | return 0; | |
1da177e4 | 1004 | } |
1da177e4 LT |
1005 | EXPORT_SYMBOL_GPL(tpm_open); |
1006 | ||
f02a9364 RA |
1007 | /* |
1008 | * Called on file close | |
1009 | */ | |
1da177e4 LT |
1010 | int tpm_release(struct inode *inode, struct file *file) |
1011 | { | |
1012 | struct tpm_chip *chip = file->private_data; | |
1da177e4 | 1013 | |
4bdec11f | 1014 | del_singleshot_timer_sync(&chip->user_read_timer); |
8e39c933 | 1015 | flush_scheduled_work(); |
5e976d55 | 1016 | file->private_data = NULL; |
1da177e4 | 1017 | atomic_set(&chip->data_pending, 0); |
f02a9364 | 1018 | kfree(chip->data_buffer); |
dc36d32c | 1019 | clear_bit(0, &chip->is_open); |
e659a3fe | 1020 | put_device(chip->dev); |
1da177e4 LT |
1021 | return 0; |
1022 | } | |
1da177e4 LT |
1023 | EXPORT_SYMBOL_GPL(tpm_release); |
1024 | ||
b888c87b | 1025 | ssize_t tpm_write(struct file *file, const char __user *buf, |
3c2f606a | 1026 | size_t size, loff_t *off) |
1da177e4 LT |
1027 | { |
1028 | struct tpm_chip *chip = file->private_data; | |
01476001 | 1029 | size_t in_size = size, out_size; |
1da177e4 LT |
1030 | |
1031 | /* cannot perform a write until the read has cleared | |
1032 | either via tpm_read or a user_read_timer timeout */ | |
700d8bdc NA |
1033 | while (atomic_read(&chip->data_pending) != 0) |
1034 | msleep(TPM_TIMEOUT); | |
1da177e4 | 1035 | |
d081d470 | 1036 | mutex_lock(&chip->buffer_mutex); |
1da177e4 LT |
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)) { | |
d081d470 | 1043 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
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); | |
d081d470 | 1051 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
1052 | |
1053 | /* Set a timeout by which the reader must come claim the result */ | |
fe3fd483 | 1054 | mod_timer(&chip->user_read_timer, jiffies + (60 * HZ)); |
1da177e4 LT |
1055 | |
1056 | return in_size; | |
1057 | } | |
1da177e4 LT |
1058 | EXPORT_SYMBOL_GPL(tpm_write); |
1059 | ||
3c2f606a KJH |
1060 | ssize_t tpm_read(struct file *file, char __user *buf, |
1061 | size_t size, loff_t *off) | |
1da177e4 LT |
1062 | { |
1063 | struct tpm_chip *chip = file->private_data; | |
01476001 | 1064 | ssize_t ret_size; |
1da177e4 | 1065 | |
5b44bd58 | 1066 | del_singleshot_timer_sync(&chip->user_read_timer); |
ba396115 | 1067 | flush_scheduled_work(); |
5b44bd58 KH |
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; | |
1da177e4 | 1073 | |
d081d470 | 1074 | mutex_lock(&chip->buffer_mutex); |
f6a2382c | 1075 | if (copy_to_user(buf, chip->data_buffer, ret_size)) |
5b44bd58 | 1076 | ret_size = -EFAULT; |
d081d470 | 1077 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
1078 | } |
1079 | ||
1080 | return ret_size; | |
1081 | } | |
1da177e4 LT |
1082 | EXPORT_SYMBOL_GPL(tpm_read); |
1083 | ||
e659a3fe | 1084 | void tpm_remove_hardware(struct device *dev) |
1da177e4 | 1085 | { |
e659a3fe | 1086 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
1087 | |
1088 | if (chip == NULL) { | |
e659a3fe | 1089 | dev_err(dev, "No device data found\n"); |
1da177e4 LT |
1090 | return; |
1091 | } | |
1092 | ||
1093 | spin_lock(&driver_lock); | |
f02a9364 | 1094 | list_del_rcu(&chip->list); |
1da177e4 | 1095 | spin_unlock(&driver_lock); |
f02a9364 | 1096 | synchronize_rcu(); |
1da177e4 | 1097 | |
90dda520 | 1098 | misc_deregister(&chip->vendor.miscdev); |
90dda520 | 1099 | sysfs_remove_group(&dev->kobj, chip->vendor.attr_group); |
55a82ab3 | 1100 | tpm_bios_log_teardown(chip->bios_dir); |
1da177e4 | 1101 | |
5bd91f18 RM |
1102 | /* write it this way to be explicit (chip->dev == dev) */ |
1103 | put_device(chip->dev); | |
1da177e4 | 1104 | } |
e659a3fe | 1105 | EXPORT_SYMBOL_GPL(tpm_remove_hardware); |
1da177e4 | 1106 | |
1da177e4 LT |
1107 | /* |
1108 | * We are about to suspend. Save the TPM state | |
1109 | * so that it can be restored. | |
1110 | */ | |
ce2c87d4 | 1111 | int tpm_pm_suspend(struct device *dev, pm_message_t pm_state) |
1da177e4 | 1112 | { |
ce2c87d4 | 1113 | struct tpm_chip *chip = dev_get_drvdata(dev); |
2490c681 DS |
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 | ||
1da177e4 LT |
1120 | if (chip == NULL) |
1121 | return -ENODEV; | |
1122 | ||
1123 | tpm_transmit(chip, savestate, sizeof(savestate)); | |
1124 | return 0; | |
1125 | } | |
1da177e4 LT |
1126 | EXPORT_SYMBOL_GPL(tpm_pm_suspend); |
1127 | ||
1128 | /* | |
1129 | * Resume from a power safe. The BIOS already restored | |
1130 | * the TPM state. | |
1131 | */ | |
ce2c87d4 | 1132 | int tpm_pm_resume(struct device *dev) |
1da177e4 | 1133 | { |
ce2c87d4 | 1134 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
1135 | |
1136 | if (chip == NULL) | |
1137 | return -ENODEV; | |
1138 | ||
1da177e4 LT |
1139 | return 0; |
1140 | } | |
1da177e4 LT |
1141 | EXPORT_SYMBOL_GPL(tpm_pm_resume); |
1142 | ||
253115b7 RA |
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 | ||
5bd91f18 RM |
1156 | /* |
1157 | * Once all references to platform device are down to 0, | |
1158 | * release all allocated structures. | |
5bd91f18 RM |
1159 | */ |
1160 | static void tpm_dev_release(struct device *dev) | |
1161 | { | |
1162 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
1163 | ||
253115b7 | 1164 | tpm_dev_vendor_release(chip); |
5bd91f18 | 1165 | |
253115b7 | 1166 | chip->release(dev); |
5bd91f18 RM |
1167 | kfree(chip); |
1168 | } | |
253115b7 | 1169 | EXPORT_SYMBOL_GPL(tpm_dev_release); |
5bd91f18 | 1170 | |
1da177e4 LT |
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 | */ | |
f02a9364 RA |
1178 | struct tpm_chip *tpm_register_hardware(struct device *dev, |
1179 | const struct tpm_vendor_specific *entry) | |
1da177e4 | 1180 | { |
6f9beccb KJH |
1181 | #define DEVNAME_SIZE 7 |
1182 | ||
1183 | char *devname; | |
1da177e4 | 1184 | struct tpm_chip *chip; |
1da177e4 LT |
1185 | |
1186 | /* Driver specific per-device data */ | |
b888c87b | 1187 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
8e39c933 PW |
1188 | devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL); |
1189 | ||
1190 | if (chip == NULL || devname == NULL) { | |
1191 | kfree(chip); | |
1192 | kfree(devname); | |
e0dd03ca | 1193 | return NULL; |
8e39c933 | 1194 | } |
1da177e4 | 1195 | |
d081d470 MK |
1196 | mutex_init(&chip->buffer_mutex); |
1197 | mutex_init(&chip->tpm_mutex); | |
1da177e4 LT |
1198 | INIT_LIST_HEAD(&chip->list); |
1199 | ||
c4028958 | 1200 | INIT_WORK(&chip->work, timeout_work); |
09e12f9f | 1201 | |
40565f19 JS |
1202 | setup_timer(&chip->user_read_timer, user_reader_timeout, |
1203 | (unsigned long)chip); | |
fe3fd483 | 1204 | |
90dda520 | 1205 | memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific)); |
1da177e4 | 1206 | |
10685a95 | 1207 | chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES); |
1da177e4 | 1208 | |
10685a95 | 1209 | if (chip->dev_num >= TPM_NUM_DEVICES) { |
b888c87b | 1210 | dev_err(dev, "No available tpm device numbers\n"); |
1da177e4 | 1211 | kfree(chip); |
e0dd03ca | 1212 | return NULL; |
1da177e4 | 1213 | } else if (chip->dev_num == 0) |
90dda520 | 1214 | chip->vendor.miscdev.minor = TPM_MINOR; |
1da177e4 | 1215 | else |
90dda520 | 1216 | chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR; |
1da177e4 | 1217 | |
10685a95 KJH |
1218 | set_bit(chip->dev_num, dev_mask); |
1219 | ||
6f9beccb | 1220 | scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num); |
90dda520 | 1221 | chip->vendor.miscdev.name = devname; |
1da177e4 | 1222 | |
94fbcded | 1223 | chip->vendor.miscdev.parent = dev; |
e659a3fe | 1224 | chip->dev = get_device(dev); |
5bd91f18 RM |
1225 | chip->release = dev->release; |
1226 | dev->release = tpm_dev_release; | |
1227 | dev_set_drvdata(dev, chip); | |
1da177e4 | 1228 | |
90dda520 | 1229 | if (misc_register(&chip->vendor.miscdev)) { |
e659a3fe | 1230 | dev_err(chip->dev, |
1da177e4 | 1231 | "unable to misc_register %s, minor %d\n", |
90dda520 KJH |
1232 | chip->vendor.miscdev.name, |
1233 | chip->vendor.miscdev.minor); | |
5bd91f18 | 1234 | put_device(chip->dev); |
e0dd03ca | 1235 | return NULL; |
1da177e4 LT |
1236 | } |
1237 | ||
f33d9bd5 | 1238 | if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) { |
5d469ec0 | 1239 | misc_deregister(&chip->vendor.miscdev); |
5bd91f18 | 1240 | put_device(chip->dev); |
f02a9364 | 1241 | |
f33d9bd5 JG |
1242 | return NULL; |
1243 | } | |
1da177e4 | 1244 | |
55a82ab3 KJH |
1245 | chip->bios_dir = tpm_bios_log_setup(devname); |
1246 | ||
f02a9364 RA |
1247 | /* Make chip available */ |
1248 | spin_lock(&driver_lock); | |
1249 | list_add_rcu(&chip->list, &tpm_chip_list); | |
1250 | spin_unlock(&driver_lock); | |
1251 | ||
e0dd03ca | 1252 | return chip; |
1da177e4 | 1253 | } |
1da177e4 LT |
1254 | EXPORT_SYMBOL_GPL(tpm_register_hardware); |
1255 | ||
1da177e4 LT |
1256 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); |
1257 | MODULE_DESCRIPTION("TPM Driver"); | |
1258 | MODULE_VERSION("2.0"); | |
1259 | MODULE_LICENSE("GPL"); |