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> |
d081d470 | 29 | |
1da177e4 LT |
30 | #include "tpm.h" |
31 | ||
3122a88a KH |
32 | enum tpm_const { |
33 | TPM_MINOR = 224, /* officially assigned */ | |
34 | TPM_BUFSIZE = 2048, | |
35 | TPM_NUM_DEVICES = 256, | |
3122a88a | 36 | }; |
1da177e4 | 37 | |
9e18ee19 KJH |
38 | enum tpm_duration { |
39 | TPM_SHORT = 0, | |
40 | TPM_MEDIUM = 1, | |
41 | TPM_LONG = 2, | |
42 | TPM_UNDEFINED, | |
43 | }; | |
44 | ||
45 | #define TPM_MAX_ORDINAL 243 | |
46 | #define TPM_MAX_PROTECTED_ORDINAL 12 | |
47 | #define TPM_PROTECTED_ORDINAL_MASK 0xFF | |
48 | ||
1da177e4 LT |
49 | static LIST_HEAD(tpm_chip_list); |
50 | static DEFINE_SPINLOCK(driver_lock); | |
10685a95 | 51 | static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES); |
1da177e4 | 52 | |
9e18ee19 KJH |
53 | /* |
54 | * Array with one entry per ordinal defining the maximum amount | |
55 | * of time the chip could take to return the result. The ordinal | |
56 | * designation of short, medium or long is defined in a table in | |
57 | * TCG Specification TPM Main Part 2 TPM Structures Section 17. The | |
58 | * values of the SHORT, MEDIUM, and LONG durations are retrieved | |
59 | * from the chip during initialization with a call to tpm_get_timeouts. | |
60 | */ | |
61 | static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = { | |
62 | TPM_UNDEFINED, /* 0 */ | |
63 | TPM_UNDEFINED, | |
64 | TPM_UNDEFINED, | |
65 | TPM_UNDEFINED, | |
66 | TPM_UNDEFINED, | |
67 | TPM_UNDEFINED, /* 5 */ | |
68 | TPM_UNDEFINED, | |
69 | TPM_UNDEFINED, | |
70 | TPM_UNDEFINED, | |
71 | TPM_UNDEFINED, | |
72 | TPM_SHORT, /* 10 */ | |
73 | TPM_SHORT, | |
74 | }; | |
75 | ||
76 | static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = { | |
77 | TPM_UNDEFINED, /* 0 */ | |
78 | TPM_UNDEFINED, | |
79 | TPM_UNDEFINED, | |
80 | TPM_UNDEFINED, | |
81 | TPM_UNDEFINED, | |
82 | TPM_UNDEFINED, /* 5 */ | |
83 | TPM_UNDEFINED, | |
84 | TPM_UNDEFINED, | |
85 | TPM_UNDEFINED, | |
86 | TPM_UNDEFINED, | |
87 | TPM_SHORT, /* 10 */ | |
88 | TPM_SHORT, | |
89 | TPM_MEDIUM, | |
90 | TPM_LONG, | |
91 | TPM_LONG, | |
92 | TPM_MEDIUM, /* 15 */ | |
93 | TPM_SHORT, | |
94 | TPM_SHORT, | |
95 | TPM_MEDIUM, | |
96 | TPM_LONG, | |
97 | TPM_SHORT, /* 20 */ | |
98 | TPM_SHORT, | |
99 | TPM_MEDIUM, | |
100 | TPM_MEDIUM, | |
101 | TPM_MEDIUM, | |
102 | TPM_SHORT, /* 25 */ | |
103 | TPM_SHORT, | |
104 | TPM_MEDIUM, | |
105 | TPM_SHORT, | |
106 | TPM_SHORT, | |
107 | TPM_MEDIUM, /* 30 */ | |
108 | TPM_LONG, | |
109 | TPM_MEDIUM, | |
110 | TPM_SHORT, | |
111 | TPM_SHORT, | |
112 | TPM_SHORT, /* 35 */ | |
113 | TPM_MEDIUM, | |
114 | TPM_MEDIUM, | |
115 | TPM_UNDEFINED, | |
116 | TPM_UNDEFINED, | |
117 | TPM_MEDIUM, /* 40 */ | |
118 | TPM_LONG, | |
119 | TPM_MEDIUM, | |
120 | TPM_SHORT, | |
121 | TPM_SHORT, | |
122 | TPM_SHORT, /* 45 */ | |
123 | TPM_SHORT, | |
124 | TPM_SHORT, | |
125 | TPM_SHORT, | |
126 | TPM_LONG, | |
127 | TPM_MEDIUM, /* 50 */ | |
128 | TPM_MEDIUM, | |
129 | TPM_UNDEFINED, | |
130 | TPM_UNDEFINED, | |
131 | TPM_UNDEFINED, | |
132 | TPM_UNDEFINED, /* 55 */ | |
133 | TPM_UNDEFINED, | |
134 | TPM_UNDEFINED, | |
135 | TPM_UNDEFINED, | |
136 | TPM_UNDEFINED, | |
137 | TPM_MEDIUM, /* 60 */ | |
138 | TPM_MEDIUM, | |
139 | TPM_MEDIUM, | |
140 | TPM_SHORT, | |
141 | TPM_SHORT, | |
142 | TPM_MEDIUM, /* 65 */ | |
143 | TPM_UNDEFINED, | |
144 | TPM_UNDEFINED, | |
145 | TPM_UNDEFINED, | |
146 | TPM_UNDEFINED, | |
147 | TPM_SHORT, /* 70 */ | |
148 | TPM_SHORT, | |
149 | TPM_UNDEFINED, | |
150 | TPM_UNDEFINED, | |
151 | TPM_UNDEFINED, | |
152 | TPM_UNDEFINED, /* 75 */ | |
153 | TPM_UNDEFINED, | |
154 | TPM_UNDEFINED, | |
155 | TPM_UNDEFINED, | |
156 | TPM_UNDEFINED, | |
157 | TPM_LONG, /* 80 */ | |
158 | TPM_UNDEFINED, | |
159 | TPM_MEDIUM, | |
160 | TPM_LONG, | |
161 | TPM_SHORT, | |
162 | TPM_UNDEFINED, /* 85 */ | |
163 | TPM_UNDEFINED, | |
164 | TPM_UNDEFINED, | |
165 | TPM_UNDEFINED, | |
166 | TPM_UNDEFINED, | |
167 | TPM_SHORT, /* 90 */ | |
168 | TPM_SHORT, | |
169 | TPM_SHORT, | |
170 | TPM_SHORT, | |
171 | TPM_SHORT, | |
172 | TPM_UNDEFINED, /* 95 */ | |
173 | TPM_UNDEFINED, | |
174 | TPM_UNDEFINED, | |
175 | TPM_UNDEFINED, | |
176 | TPM_UNDEFINED, | |
177 | TPM_MEDIUM, /* 100 */ | |
178 | TPM_SHORT, | |
179 | TPM_SHORT, | |
180 | TPM_UNDEFINED, | |
181 | TPM_UNDEFINED, | |
182 | TPM_UNDEFINED, /* 105 */ | |
183 | TPM_UNDEFINED, | |
184 | TPM_UNDEFINED, | |
185 | TPM_UNDEFINED, | |
186 | TPM_UNDEFINED, | |
187 | TPM_SHORT, /* 110 */ | |
188 | TPM_SHORT, | |
189 | TPM_SHORT, | |
190 | TPM_SHORT, | |
191 | TPM_SHORT, | |
192 | TPM_SHORT, /* 115 */ | |
193 | TPM_SHORT, | |
194 | TPM_SHORT, | |
195 | TPM_UNDEFINED, | |
196 | TPM_UNDEFINED, | |
197 | TPM_LONG, /* 120 */ | |
198 | TPM_LONG, | |
199 | TPM_MEDIUM, | |
200 | TPM_UNDEFINED, | |
201 | TPM_SHORT, | |
202 | TPM_SHORT, /* 125 */ | |
203 | TPM_SHORT, | |
204 | TPM_LONG, | |
205 | TPM_SHORT, | |
206 | TPM_SHORT, | |
207 | TPM_SHORT, /* 130 */ | |
208 | TPM_MEDIUM, | |
209 | TPM_UNDEFINED, | |
210 | TPM_SHORT, | |
211 | TPM_MEDIUM, | |
212 | TPM_UNDEFINED, /* 135 */ | |
213 | TPM_UNDEFINED, | |
214 | TPM_UNDEFINED, | |
215 | TPM_UNDEFINED, | |
216 | TPM_UNDEFINED, | |
217 | TPM_SHORT, /* 140 */ | |
218 | TPM_SHORT, | |
219 | TPM_UNDEFINED, | |
220 | TPM_UNDEFINED, | |
221 | TPM_UNDEFINED, | |
222 | TPM_UNDEFINED, /* 145 */ | |
223 | TPM_UNDEFINED, | |
224 | TPM_UNDEFINED, | |
225 | TPM_UNDEFINED, | |
226 | TPM_UNDEFINED, | |
227 | TPM_SHORT, /* 150 */ | |
228 | TPM_MEDIUM, | |
229 | TPM_MEDIUM, | |
230 | TPM_SHORT, | |
231 | TPM_SHORT, | |
232 | TPM_UNDEFINED, /* 155 */ | |
233 | TPM_UNDEFINED, | |
234 | TPM_UNDEFINED, | |
235 | TPM_UNDEFINED, | |
236 | TPM_UNDEFINED, | |
237 | TPM_SHORT, /* 160 */ | |
238 | TPM_SHORT, | |
239 | TPM_SHORT, | |
240 | TPM_SHORT, | |
241 | TPM_UNDEFINED, | |
242 | TPM_UNDEFINED, /* 165 */ | |
243 | TPM_UNDEFINED, | |
244 | TPM_UNDEFINED, | |
245 | TPM_UNDEFINED, | |
246 | TPM_UNDEFINED, | |
247 | TPM_LONG, /* 170 */ | |
248 | TPM_UNDEFINED, | |
249 | TPM_UNDEFINED, | |
250 | TPM_UNDEFINED, | |
251 | TPM_UNDEFINED, | |
252 | TPM_UNDEFINED, /* 175 */ | |
253 | TPM_UNDEFINED, | |
254 | TPM_UNDEFINED, | |
255 | TPM_UNDEFINED, | |
256 | TPM_UNDEFINED, | |
257 | TPM_MEDIUM, /* 180 */ | |
258 | TPM_SHORT, | |
259 | TPM_MEDIUM, | |
260 | TPM_MEDIUM, | |
261 | TPM_MEDIUM, | |
262 | TPM_MEDIUM, /* 185 */ | |
263 | TPM_SHORT, | |
264 | TPM_UNDEFINED, | |
265 | TPM_UNDEFINED, | |
266 | TPM_UNDEFINED, | |
267 | TPM_UNDEFINED, /* 190 */ | |
268 | TPM_UNDEFINED, | |
269 | TPM_UNDEFINED, | |
270 | TPM_UNDEFINED, | |
271 | TPM_UNDEFINED, | |
272 | TPM_UNDEFINED, /* 195 */ | |
273 | TPM_UNDEFINED, | |
274 | TPM_UNDEFINED, | |
275 | TPM_UNDEFINED, | |
276 | TPM_UNDEFINED, | |
277 | TPM_SHORT, /* 200 */ | |
278 | TPM_UNDEFINED, | |
279 | TPM_UNDEFINED, | |
280 | TPM_UNDEFINED, | |
281 | TPM_SHORT, | |
282 | TPM_SHORT, /* 205 */ | |
283 | TPM_SHORT, | |
284 | TPM_SHORT, | |
285 | TPM_SHORT, | |
286 | TPM_SHORT, | |
287 | TPM_MEDIUM, /* 210 */ | |
288 | TPM_UNDEFINED, | |
289 | TPM_MEDIUM, | |
290 | TPM_MEDIUM, | |
291 | TPM_MEDIUM, | |
292 | TPM_UNDEFINED, /* 215 */ | |
293 | TPM_MEDIUM, | |
294 | TPM_UNDEFINED, | |
295 | TPM_UNDEFINED, | |
296 | TPM_SHORT, | |
297 | TPM_SHORT, /* 220 */ | |
298 | TPM_SHORT, | |
299 | TPM_SHORT, | |
300 | TPM_SHORT, | |
301 | TPM_SHORT, | |
302 | TPM_UNDEFINED, /* 225 */ | |
303 | TPM_UNDEFINED, | |
304 | TPM_UNDEFINED, | |
305 | TPM_UNDEFINED, | |
306 | TPM_UNDEFINED, | |
307 | TPM_SHORT, /* 230 */ | |
308 | TPM_LONG, | |
309 | TPM_MEDIUM, | |
310 | TPM_UNDEFINED, | |
311 | TPM_UNDEFINED, | |
312 | TPM_UNDEFINED, /* 235 */ | |
313 | TPM_UNDEFINED, | |
314 | TPM_UNDEFINED, | |
315 | TPM_UNDEFINED, | |
316 | TPM_UNDEFINED, | |
317 | TPM_SHORT, /* 240 */ | |
318 | TPM_UNDEFINED, | |
319 | TPM_MEDIUM, | |
320 | }; | |
321 | ||
1da177e4 LT |
322 | static void user_reader_timeout(unsigned long ptr) |
323 | { | |
324 | struct tpm_chip *chip = (struct tpm_chip *) ptr; | |
325 | ||
09e12f9f KJH |
326 | schedule_work(&chip->work); |
327 | } | |
328 | ||
c4028958 | 329 | static void timeout_work(struct work_struct *work) |
09e12f9f | 330 | { |
c4028958 | 331 | struct tpm_chip *chip = container_of(work, struct tpm_chip, work); |
09e12f9f | 332 | |
d081d470 | 333 | mutex_lock(&chip->buffer_mutex); |
1da177e4 LT |
334 | atomic_set(&chip->data_pending, 0); |
335 | memset(chip->data_buffer, 0, TPM_BUFSIZE); | |
d081d470 | 336 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
337 | } |
338 | ||
9e18ee19 KJH |
339 | /* |
340 | * Returns max number of jiffies to wait | |
341 | */ | |
342 | unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, | |
343 | u32 ordinal) | |
344 | { | |
345 | int duration_idx = TPM_UNDEFINED; | |
346 | int duration = 0; | |
347 | ||
348 | if (ordinal < TPM_MAX_ORDINAL) | |
349 | duration_idx = tpm_ordinal_duration[ordinal]; | |
350 | else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) < | |
351 | TPM_MAX_PROTECTED_ORDINAL) | |
352 | duration_idx = | |
353 | tpm_protected_ordinal_duration[ordinal & | |
354 | TPM_PROTECTED_ORDINAL_MASK]; | |
355 | ||
356 | if (duration_idx != TPM_UNDEFINED) | |
36b20020 | 357 | duration = chip->vendor.duration[duration_idx]; |
9e18ee19 KJH |
358 | if (duration <= 0) |
359 | return 2 * 60 * HZ; | |
360 | else | |
361 | return duration; | |
362 | } | |
363 | EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration); | |
364 | ||
1da177e4 LT |
365 | /* |
366 | * Internal kernel interface to transmit TPM commands | |
367 | */ | |
368 | static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf, | |
369 | size_t bufsiz) | |
370 | { | |
d9e5b6bf | 371 | ssize_t rc; |
9e18ee19 | 372 | u32 count, ordinal; |
700d8bdc | 373 | unsigned long stop; |
1da177e4 | 374 | |
81179bb6 | 375 | count = be32_to_cpu(*((__be32 *) (buf + 2))); |
9e18ee19 | 376 | ordinal = be32_to_cpu(*((__be32 *) (buf + 6))); |
1da177e4 LT |
377 | if (count == 0) |
378 | return -ENODATA; | |
379 | if (count > bufsiz) { | |
e659a3fe | 380 | dev_err(chip->dev, |
b76be681 | 381 | "invalid count value %x %zx \n", count, bufsiz); |
1da177e4 LT |
382 | return -E2BIG; |
383 | } | |
384 | ||
d081d470 | 385 | mutex_lock(&chip->tpm_mutex); |
1da177e4 | 386 | |
90dda520 | 387 | if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) { |
e659a3fe | 388 | dev_err(chip->dev, |
d9e5b6bf KH |
389 | "tpm_transmit: tpm_send: error %zd\n", rc); |
390 | goto out; | |
1da177e4 LT |
391 | } |
392 | ||
27084efe LD |
393 | if (chip->vendor.irq) |
394 | goto out_recv; | |
395 | ||
9e18ee19 | 396 | stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal); |
1da177e4 | 397 | do { |
90dda520 KJH |
398 | u8 status = chip->vendor.status(chip); |
399 | if ((status & chip->vendor.req_complete_mask) == | |
400 | chip->vendor.req_complete_val) | |
1da177e4 | 401 | goto out_recv; |
d9e5b6bf | 402 | |
90dda520 | 403 | if ((status == chip->vendor.req_canceled)) { |
e659a3fe | 404 | dev_err(chip->dev, "Operation Canceled\n"); |
d9e5b6bf KH |
405 | rc = -ECANCELED; |
406 | goto out; | |
407 | } | |
408 | ||
409 | msleep(TPM_TIMEOUT); /* CHECK */ | |
1da177e4 | 410 | rmb(); |
700d8bdc | 411 | } while (time_before(jiffies, stop)); |
1da177e4 | 412 | |
90dda520 | 413 | chip->vendor.cancel(chip); |
e659a3fe | 414 | dev_err(chip->dev, "Operation Timed out\n"); |
d9e5b6bf KH |
415 | rc = -ETIME; |
416 | goto out; | |
1da177e4 LT |
417 | |
418 | out_recv: | |
90dda520 | 419 | rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz); |
d9e5b6bf | 420 | if (rc < 0) |
e659a3fe | 421 | dev_err(chip->dev, |
d9e5b6bf KH |
422 | "tpm_transmit: tpm_recv: error %zd\n", rc); |
423 | out: | |
d081d470 | 424 | mutex_unlock(&chip->tpm_mutex); |
d9e5b6bf | 425 | return rc; |
1da177e4 LT |
426 | } |
427 | ||
428 | #define TPM_DIGEST_SIZE 20 | |
beed53a1 KJH |
429 | #define TPM_ERROR_SIZE 10 |
430 | #define TPM_RET_CODE_IDX 6 | |
431 | #define TPM_GET_CAP_RET_SIZE_IDX 10 | |
432 | #define TPM_GET_CAP_RET_UINT32_1_IDX 14 | |
433 | #define TPM_GET_CAP_RET_UINT32_2_IDX 18 | |
434 | #define TPM_GET_CAP_RET_UINT32_3_IDX 22 | |
435 | #define TPM_GET_CAP_RET_UINT32_4_IDX 26 | |
08e96e48 KJH |
436 | #define TPM_GET_CAP_PERM_DISABLE_IDX 16 |
437 | #define TPM_GET_CAP_PERM_INACTIVE_IDX 18 | |
438 | #define TPM_GET_CAP_RET_BOOL_1_IDX 14 | |
439 | #define TPM_GET_CAP_TEMP_INACTIVE_IDX 16 | |
beed53a1 KJH |
440 | |
441 | #define TPM_CAP_IDX 13 | |
442 | #define TPM_CAP_SUBCAP_IDX 21 | |
443 | ||
444 | enum tpm_capabilities { | |
08e96e48 | 445 | TPM_CAP_FLAG = 4, |
beed53a1 KJH |
446 | TPM_CAP_PROP = 5, |
447 | }; | |
448 | ||
449 | enum tpm_sub_capabilities { | |
450 | TPM_CAP_PROP_PCR = 0x1, | |
451 | TPM_CAP_PROP_MANUFACTURER = 0x3, | |
08e96e48 KJH |
452 | TPM_CAP_FLAG_PERM = 0x8, |
453 | TPM_CAP_FLAG_VOL = 0x9, | |
454 | TPM_CAP_PROP_OWNER = 0x11, | |
455 | TPM_CAP_PROP_TIS_TIMEOUT = 0x15, | |
456 | TPM_CAP_PROP_TIS_DURATION = 0x20, | |
beed53a1 KJH |
457 | }; |
458 | ||
459 | /* | |
460 | * This is a semi generic GetCapability command for use | |
461 | * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG | |
462 | * and their associated sub_capabilities. | |
463 | */ | |
464 | ||
465 | static const u8 tpm_cap[] = { | |
1da177e4 LT |
466 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
467 | 0, 0, 0, 22, /* length */ | |
468 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
beed53a1 KJH |
469 | 0, 0, 0, 0, /* TPM_CAP_<TYPE> */ |
470 | 0, 0, 0, 4, /* TPM_CAP_SUB_<TYPE> size */ | |
471 | 0, 0, 1, 0 /* TPM_CAP_SUB_<TYPE> */ | |
1da177e4 LT |
472 | }; |
473 | ||
beed53a1 KJH |
474 | static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len, |
475 | char *desc) | |
476 | { | |
477 | int err; | |
478 | ||
479 | len = tpm_transmit(chip, data, len); | |
480 | if (len < 0) | |
481 | return len; | |
482 | if (len == TPM_ERROR_SIZE) { | |
483 | err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))); | |
484 | dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc); | |
485 | return err; | |
486 | } | |
487 | return 0; | |
488 | } | |
489 | ||
08e96e48 KJH |
490 | void tpm_gen_interrupt(struct tpm_chip *chip) |
491 | { | |
492 | u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)]; | |
493 | ssize_t rc; | |
494 | ||
495 | memcpy(data, tpm_cap, sizeof(tpm_cap)); | |
496 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
497 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT; | |
498 | ||
499 | rc = transmit_cmd(chip, data, sizeof(data), | |
500 | "attempting to determine the timeouts"); | |
501 | } | |
502 | EXPORT_SYMBOL_GPL(tpm_gen_interrupt); | |
503 | ||
504 | void tpm_get_timeouts(struct tpm_chip *chip) | |
505 | { | |
506 | u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)]; | |
507 | ssize_t rc; | |
508 | u32 timeout; | |
509 | ||
510 | memcpy(data, tpm_cap, sizeof(tpm_cap)); | |
511 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
512 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT; | |
513 | ||
514 | rc = transmit_cmd(chip, data, sizeof(data), | |
515 | "attempting to determine the timeouts"); | |
516 | if (rc) | |
517 | goto duration; | |
518 | ||
519 | if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX))) | |
520 | != 4 * sizeof(u32)) | |
521 | goto duration; | |
522 | ||
523 | /* Don't overwrite default if value is 0 */ | |
524 | timeout = | |
525 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))); | |
526 | if (timeout) | |
36b20020 | 527 | chip->vendor.timeout_a = msecs_to_jiffies(timeout); |
08e96e48 KJH |
528 | timeout = |
529 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX))); | |
530 | if (timeout) | |
36b20020 | 531 | chip->vendor.timeout_b = msecs_to_jiffies(timeout); |
08e96e48 KJH |
532 | timeout = |
533 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX))); | |
534 | if (timeout) | |
36b20020 | 535 | chip->vendor.timeout_c = msecs_to_jiffies(timeout); |
08e96e48 KJH |
536 | timeout = |
537 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX))); | |
538 | if (timeout) | |
36b20020 | 539 | chip->vendor.timeout_d = msecs_to_jiffies(timeout); |
08e96e48 KJH |
540 | |
541 | duration: | |
542 | memcpy(data, tpm_cap, sizeof(tpm_cap)); | |
543 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
544 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_DURATION; | |
545 | ||
546 | rc = transmit_cmd(chip, data, sizeof(data), | |
547 | "attempting to determine the durations"); | |
548 | if (rc) | |
549 | return; | |
550 | ||
551 | if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX))) | |
552 | != 3 * sizeof(u32)) | |
553 | return; | |
554 | ||
555 | chip->vendor.duration[TPM_SHORT] = | |
36b20020 KJH |
556 | msecs_to_jiffies(be32_to_cpu |
557 | (*((__be32 *) (data + | |
558 | TPM_GET_CAP_RET_UINT32_1_IDX)))); | |
08e96e48 | 559 | chip->vendor.duration[TPM_MEDIUM] = |
36b20020 KJH |
560 | msecs_to_jiffies(be32_to_cpu |
561 | (*((__be32 *) (data + | |
562 | TPM_GET_CAP_RET_UINT32_2_IDX)))); | |
08e96e48 | 563 | chip->vendor.duration[TPM_LONG] = |
36b20020 KJH |
564 | msecs_to_jiffies(be32_to_cpu |
565 | (*((__be32 *) (data + | |
566 | TPM_GET_CAP_RET_UINT32_3_IDX)))); | |
08e96e48 KJH |
567 | } |
568 | EXPORT_SYMBOL_GPL(tpm_get_timeouts); | |
569 | ||
570 | void tpm_continue_selftest(struct tpm_chip *chip) | |
571 | { | |
572 | u8 data[] = { | |
573 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
574 | 0, 0, 0, 10, /* length */ | |
575 | 0, 0, 0, 83, /* TPM_ORD_GetCapability */ | |
576 | }; | |
577 | ||
578 | tpm_transmit(chip, data, sizeof(data)); | |
579 | } | |
580 | EXPORT_SYMBOL_GPL(tpm_continue_selftest); | |
581 | ||
582 | ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr, | |
583 | char *buf) | |
584 | { | |
585 | u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)]; | |
586 | ssize_t rc; | |
587 | ||
588 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
589 | if (chip == NULL) | |
590 | return -ENODEV; | |
591 | ||
592 | memcpy(data, tpm_cap, sizeof(tpm_cap)); | |
593 | data[TPM_CAP_IDX] = TPM_CAP_FLAG; | |
594 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM; | |
595 | ||
596 | rc = transmit_cmd(chip, data, sizeof(data), | |
597 | "attemtping to determine the permanent state"); | |
598 | if (rc) | |
599 | return 0; | |
600 | return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]); | |
601 | } | |
602 | EXPORT_SYMBOL_GPL(tpm_show_enabled); | |
603 | ||
604 | ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr, | |
605 | char *buf) | |
606 | { | |
607 | u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)]; | |
608 | ssize_t rc; | |
609 | ||
610 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
611 | if (chip == NULL) | |
612 | return -ENODEV; | |
613 | ||
614 | memcpy(data, tpm_cap, sizeof(tpm_cap)); | |
615 | data[TPM_CAP_IDX] = TPM_CAP_FLAG; | |
616 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM; | |
617 | ||
618 | rc = transmit_cmd(chip, data, sizeof(data), | |
619 | "attemtping to determine the permanent state"); | |
620 | if (rc) | |
621 | return 0; | |
622 | return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]); | |
623 | } | |
624 | EXPORT_SYMBOL_GPL(tpm_show_active); | |
625 | ||
626 | ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr, | |
627 | char *buf) | |
628 | { | |
629 | u8 data[sizeof(tpm_cap)]; | |
630 | ssize_t rc; | |
631 | ||
632 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
633 | if (chip == NULL) | |
634 | return -ENODEV; | |
635 | ||
636 | memcpy(data, tpm_cap, sizeof(tpm_cap)); | |
637 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
638 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER; | |
639 | ||
640 | rc = transmit_cmd(chip, data, sizeof(data), | |
641 | "attempting to determine the owner state"); | |
642 | if (rc) | |
643 | return 0; | |
644 | return sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]); | |
645 | } | |
646 | EXPORT_SYMBOL_GPL(tpm_show_owned); | |
647 | ||
648 | ssize_t tpm_show_temp_deactivated(struct device * dev, | |
649 | struct device_attribute * attr, char *buf) | |
650 | { | |
651 | u8 data[sizeof(tpm_cap)]; | |
652 | ssize_t rc; | |
653 | ||
654 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
655 | if (chip == NULL) | |
656 | return -ENODEV; | |
657 | ||
658 | memcpy(data, tpm_cap, sizeof(tpm_cap)); | |
659 | data[TPM_CAP_IDX] = TPM_CAP_FLAG; | |
660 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL; | |
661 | ||
662 | rc = transmit_cmd(chip, data, sizeof(data), | |
663 | "attempting to determine the temporary state"); | |
664 | if (rc) | |
665 | return 0; | |
666 | return sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]); | |
667 | } | |
668 | EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated); | |
669 | ||
dff37e4b | 670 | static const u8 pcrread[] = { |
1da177e4 LT |
671 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
672 | 0, 0, 0, 14, /* length */ | |
673 | 0, 0, 0, 21, /* TPM_ORD_PcrRead */ | |
674 | 0, 0, 0, 0 /* PCR index */ | |
675 | }; | |
676 | ||
6659ca2a KH |
677 | ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr, |
678 | char *buf) | |
1da177e4 | 679 | { |
08e96e48 | 680 | u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(pcrread)), 30)]; |
beed53a1 | 681 | ssize_t rc; |
81179bb6 KH |
682 | int i, j, num_pcrs; |
683 | __be32 index; | |
1da177e4 LT |
684 | char *str = buf; |
685 | ||
e659a3fe | 686 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
687 | if (chip == NULL) |
688 | return -ENODEV; | |
689 | ||
beed53a1 KJH |
690 | memcpy(data, tpm_cap, sizeof(tpm_cap)); |
691 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
692 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR; | |
693 | ||
694 | rc = transmit_cmd(chip, data, sizeof(data), | |
695 | "attempting to determine the number of PCRS"); | |
696 | if (rc) | |
e234bc97 | 697 | return 0; |
1da177e4 | 698 | |
81179bb6 | 699 | num_pcrs = be32_to_cpu(*((__be32 *) (data + 14))); |
1da177e4 LT |
700 | for (i = 0; i < num_pcrs; i++) { |
701 | memcpy(data, pcrread, sizeof(pcrread)); | |
702 | index = cpu_to_be32(i); | |
703 | memcpy(data + 10, &index, 4); | |
beed53a1 KJH |
704 | rc = transmit_cmd(chip, data, sizeof(data), |
705 | "attempting to read a PCR"); | |
706 | if (rc) | |
e234bc97 | 707 | goto out; |
1da177e4 LT |
708 | str += sprintf(str, "PCR-%02d: ", i); |
709 | for (j = 0; j < TPM_DIGEST_SIZE; j++) | |
710 | str += sprintf(str, "%02X ", *(data + 10 + j)); | |
711 | str += sprintf(str, "\n"); | |
712 | } | |
e234bc97 | 713 | out: |
1da177e4 LT |
714 | return str - buf; |
715 | } | |
6659ca2a | 716 | EXPORT_SYMBOL_GPL(tpm_show_pcrs); |
1da177e4 LT |
717 | |
718 | #define READ_PUBEK_RESULT_SIZE 314 | |
dff37e4b | 719 | static const u8 readpubek[] = { |
1da177e4 LT |
720 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
721 | 0, 0, 0, 30, /* length */ | |
722 | 0, 0, 0, 124, /* TPM_ORD_ReadPubek */ | |
723 | }; | |
724 | ||
6659ca2a KH |
725 | ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr, |
726 | char *buf) | |
1da177e4 | 727 | { |
2df7111f | 728 | u8 *data; |
beed53a1 | 729 | ssize_t err; |
81179bb6 | 730 | int i, rc; |
1da177e4 LT |
731 | char *str = buf; |
732 | ||
e659a3fe | 733 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
734 | if (chip == NULL) |
735 | return -ENODEV; | |
736 | ||
b888c87b | 737 | data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL); |
2df7111f KH |
738 | if (!data) |
739 | return -ENOMEM; | |
740 | ||
1da177e4 | 741 | memcpy(data, readpubek, sizeof(readpubek)); |
1da177e4 | 742 | |
beed53a1 KJH |
743 | err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE, |
744 | "attempting to read the PUBEK"); | |
745 | if (err) | |
34d6e075 | 746 | goto out; |
1da177e4 LT |
747 | |
748 | /* | |
749 | ignore header 10 bytes | |
750 | algorithm 32 bits (1 == RSA ) | |
751 | encscheme 16 bits | |
752 | sigscheme 16 bits | |
753 | parameters (RSA 12->bytes: keybit, #primes, expbit) | |
754 | keylenbytes 32 bits | |
755 | 256 byte modulus | |
756 | ignore checksum 20 bytes | |
757 | */ | |
758 | ||
1da177e4 LT |
759 | str += |
760 | sprintf(str, | |
761 | "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n" | |
762 | "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X" | |
763 | " %02X %02X %02X %02X %02X %02X %02X %02X\n" | |
764 | "Modulus length: %d\nModulus: \n", | |
765 | data[10], data[11], data[12], data[13], data[14], | |
766 | data[15], data[16], data[17], data[22], data[23], | |
767 | data[24], data[25], data[26], data[27], data[28], | |
768 | data[29], data[30], data[31], data[32], data[33], | |
1dda8abe | 769 | be32_to_cpu(*((__be32 *) (data + 34)))); |
1da177e4 LT |
770 | |
771 | for (i = 0; i < 256; i++) { | |
1dda8abe | 772 | str += sprintf(str, "%02X ", data[i + 38]); |
1da177e4 LT |
773 | if ((i + 1) % 16 == 0) |
774 | str += sprintf(str, "\n"); | |
775 | } | |
34d6e075 | 776 | out: |
beed53a1 | 777 | rc = str - buf; |
2df7111f KH |
778 | kfree(data); |
779 | return rc; | |
1da177e4 | 780 | } |
6659ca2a | 781 | EXPORT_SYMBOL_GPL(tpm_show_pubek); |
1da177e4 | 782 | |
beed53a1 | 783 | #define CAP_VERSION_1_1 6 |
08e96e48 | 784 | #define CAP_VERSION_1_2 0x1A |
beed53a1 | 785 | #define CAP_VERSION_IDX 13 |
dff37e4b | 786 | static const u8 cap_version[] = { |
1da177e4 LT |
787 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
788 | 0, 0, 0, 18, /* length */ | |
789 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
beed53a1 | 790 | 0, 0, 0, 0, |
1da177e4 LT |
791 | 0, 0, 0, 0 |
792 | }; | |
793 | ||
6659ca2a KH |
794 | ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr, |
795 | char *buf) | |
1da177e4 | 796 | { |
08e96e48 | 797 | u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)]; |
beed53a1 | 798 | ssize_t rc; |
1da177e4 LT |
799 | char *str = buf; |
800 | ||
e659a3fe | 801 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
802 | if (chip == NULL) |
803 | return -ENODEV; | |
804 | ||
beed53a1 KJH |
805 | memcpy(data, tpm_cap, sizeof(tpm_cap)); |
806 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
807 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER; | |
1da177e4 | 808 | |
beed53a1 KJH |
809 | rc = transmit_cmd(chip, data, sizeof(data), |
810 | "attempting to determine the manufacturer"); | |
811 | if (rc) | |
812 | return 0; | |
1da177e4 LT |
813 | |
814 | str += sprintf(str, "Manufacturer: 0x%x\n", | |
beed53a1 | 815 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)))); |
1da177e4 LT |
816 | |
817 | memcpy(data, cap_version, sizeof(cap_version)); | |
beed53a1 KJH |
818 | data[CAP_VERSION_IDX] = CAP_VERSION_1_1; |
819 | rc = transmit_cmd(chip, data, sizeof(data), | |
820 | "attempting to determine the 1.1 version"); | |
821 | if (rc) | |
822 | goto out; | |
1da177e4 | 823 | |
beed53a1 KJH |
824 | str += sprintf(str, |
825 | "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
826 | (int) data[14], (int) data[15], (int) data[16], | |
827 | (int) data[17]); | |
1da177e4 | 828 | |
beed53a1 | 829 | out: |
1da177e4 LT |
830 | return str - buf; |
831 | } | |
6659ca2a KH |
832 | EXPORT_SYMBOL_GPL(tpm_show_caps); |
833 | ||
08e96e48 KJH |
834 | ssize_t tpm_show_caps_1_2(struct device * dev, |
835 | struct device_attribute * attr, char *buf) | |
836 | { | |
837 | u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)]; | |
838 | ssize_t len; | |
839 | char *str = buf; | |
840 | ||
841 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
842 | if (chip == NULL) | |
843 | return -ENODEV; | |
844 | ||
845 | memcpy(data, tpm_cap, sizeof(tpm_cap)); | |
846 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
847 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER; | |
848 | ||
849 | if ((len = tpm_transmit(chip, data, sizeof(data))) <= | |
850 | TPM_ERROR_SIZE) { | |
851 | dev_dbg(chip->dev, "A TPM error (%d) occurred " | |
852 | "attempting to determine the manufacturer\n", | |
853 | be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)))); | |
854 | return 0; | |
855 | } | |
856 | ||
857 | str += sprintf(str, "Manufacturer: 0x%x\n", | |
858 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)))); | |
859 | ||
860 | memcpy(data, cap_version, sizeof(cap_version)); | |
861 | data[CAP_VERSION_IDX] = CAP_VERSION_1_2; | |
862 | ||
863 | if ((len = tpm_transmit(chip, data, sizeof(data))) <= | |
864 | TPM_ERROR_SIZE) { | |
865 | dev_err(chip->dev, "A TPM error (%d) occurred " | |
866 | "attempting to determine the 1.2 version\n", | |
867 | be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)))); | |
868 | goto out; | |
869 | } | |
870 | str += sprintf(str, | |
871 | "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
872 | (int) data[16], (int) data[17], (int) data[18], | |
873 | (int) data[19]); | |
874 | ||
875 | out: | |
876 | return str - buf; | |
877 | } | |
878 | EXPORT_SYMBOL_GPL(tpm_show_caps_1_2); | |
879 | ||
6659ca2a KH |
880 | ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr, |
881 | const char *buf, size_t count) | |
882 | { | |
883 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
884 | if (chip == NULL) | |
885 | return 0; | |
886 | ||
90dda520 | 887 | chip->vendor.cancel(chip); |
6659ca2a KH |
888 | return count; |
889 | } | |
890 | EXPORT_SYMBOL_GPL(tpm_store_cancel); | |
1da177e4 | 891 | |
1da177e4 LT |
892 | /* |
893 | * Device file system interface to the TPM | |
894 | */ | |
895 | int tpm_open(struct inode *inode, struct file *file) | |
896 | { | |
897 | int rc = 0, minor = iminor(inode); | |
898 | struct tpm_chip *chip = NULL, *pos; | |
899 | ||
900 | spin_lock(&driver_lock); | |
901 | ||
902 | list_for_each_entry(pos, &tpm_chip_list, list) { | |
90dda520 | 903 | if (pos->vendor.miscdev.minor == minor) { |
1da177e4 LT |
904 | chip = pos; |
905 | break; | |
906 | } | |
907 | } | |
908 | ||
909 | if (chip == NULL) { | |
910 | rc = -ENODEV; | |
911 | goto err_out; | |
912 | } | |
913 | ||
914 | if (chip->num_opens) { | |
b888c87b | 915 | dev_dbg(chip->dev, "Another process owns this TPM\n"); |
1da177e4 LT |
916 | rc = -EBUSY; |
917 | goto err_out; | |
918 | } | |
919 | ||
920 | chip->num_opens++; | |
e659a3fe | 921 | get_device(chip->dev); |
1da177e4 LT |
922 | |
923 | spin_unlock(&driver_lock); | |
924 | ||
925 | chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); | |
926 | if (chip->data_buffer == NULL) { | |
927 | chip->num_opens--; | |
e659a3fe | 928 | put_device(chip->dev); |
1da177e4 LT |
929 | return -ENOMEM; |
930 | } | |
931 | ||
932 | atomic_set(&chip->data_pending, 0); | |
933 | ||
934 | file->private_data = chip; | |
935 | return 0; | |
936 | ||
937 | err_out: | |
938 | spin_unlock(&driver_lock); | |
939 | return rc; | |
940 | } | |
1da177e4 LT |
941 | EXPORT_SYMBOL_GPL(tpm_open); |
942 | ||
943 | int tpm_release(struct inode *inode, struct file *file) | |
944 | { | |
945 | struct tpm_chip *chip = file->private_data; | |
1da177e4 | 946 | |
8e39c933 | 947 | flush_scheduled_work(); |
1da177e4 | 948 | spin_lock(&driver_lock); |
5e976d55 | 949 | file->private_data = NULL; |
fe3fd483 | 950 | del_singleshot_timer_sync(&chip->user_read_timer); |
1da177e4 | 951 | atomic_set(&chip->data_pending, 0); |
8e39c933 | 952 | chip->num_opens--; |
e659a3fe | 953 | put_device(chip->dev); |
5e976d55 KH |
954 | kfree(chip->data_buffer); |
955 | spin_unlock(&driver_lock); | |
1da177e4 LT |
956 | return 0; |
957 | } | |
1da177e4 LT |
958 | EXPORT_SYMBOL_GPL(tpm_release); |
959 | ||
b888c87b | 960 | ssize_t tpm_write(struct file *file, const char __user *buf, |
3c2f606a | 961 | size_t size, loff_t *off) |
1da177e4 LT |
962 | { |
963 | struct tpm_chip *chip = file->private_data; | |
964 | int in_size = size, out_size; | |
965 | ||
966 | /* cannot perform a write until the read has cleared | |
967 | either via tpm_read or a user_read_timer timeout */ | |
700d8bdc NA |
968 | while (atomic_read(&chip->data_pending) != 0) |
969 | msleep(TPM_TIMEOUT); | |
1da177e4 | 970 | |
d081d470 | 971 | mutex_lock(&chip->buffer_mutex); |
1da177e4 LT |
972 | |
973 | if (in_size > TPM_BUFSIZE) | |
974 | in_size = TPM_BUFSIZE; | |
975 | ||
976 | if (copy_from_user | |
977 | (chip->data_buffer, (void __user *) buf, in_size)) { | |
d081d470 | 978 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
979 | return -EFAULT; |
980 | } | |
981 | ||
982 | /* atomic tpm command send and result receive */ | |
983 | out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE); | |
984 | ||
985 | atomic_set(&chip->data_pending, out_size); | |
d081d470 | 986 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
987 | |
988 | /* Set a timeout by which the reader must come claim the result */ | |
fe3fd483 | 989 | mod_timer(&chip->user_read_timer, jiffies + (60 * HZ)); |
1da177e4 LT |
990 | |
991 | return in_size; | |
992 | } | |
1da177e4 LT |
993 | EXPORT_SYMBOL_GPL(tpm_write); |
994 | ||
3c2f606a KJH |
995 | ssize_t tpm_read(struct file *file, char __user *buf, |
996 | size_t size, loff_t *off) | |
1da177e4 LT |
997 | { |
998 | struct tpm_chip *chip = file->private_data; | |
5b44bd58 | 999 | int ret_size; |
1da177e4 | 1000 | |
5b44bd58 | 1001 | del_singleshot_timer_sync(&chip->user_read_timer); |
ba396115 | 1002 | flush_scheduled_work(); |
5b44bd58 KH |
1003 | ret_size = atomic_read(&chip->data_pending); |
1004 | atomic_set(&chip->data_pending, 0); | |
1005 | if (ret_size > 0) { /* relay data */ | |
1006 | if (size < ret_size) | |
1007 | ret_size = size; | |
1da177e4 | 1008 | |
d081d470 | 1009 | mutex_lock(&chip->buffer_mutex); |
f6a2382c | 1010 | if (copy_to_user(buf, chip->data_buffer, ret_size)) |
5b44bd58 | 1011 | ret_size = -EFAULT; |
d081d470 | 1012 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
1013 | } |
1014 | ||
1015 | return ret_size; | |
1016 | } | |
1da177e4 LT |
1017 | EXPORT_SYMBOL_GPL(tpm_read); |
1018 | ||
e659a3fe | 1019 | void tpm_remove_hardware(struct device *dev) |
1da177e4 | 1020 | { |
e659a3fe | 1021 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
1022 | |
1023 | if (chip == NULL) { | |
e659a3fe | 1024 | dev_err(dev, "No device data found\n"); |
1da177e4 LT |
1025 | return; |
1026 | } | |
1027 | ||
1028 | spin_lock(&driver_lock); | |
1029 | ||
1030 | list_del(&chip->list); | |
1031 | ||
1032 | spin_unlock(&driver_lock); | |
1033 | ||
e659a3fe | 1034 | dev_set_drvdata(dev, NULL); |
90dda520 KJH |
1035 | misc_deregister(&chip->vendor.miscdev); |
1036 | kfree(chip->vendor.miscdev.name); | |
1da177e4 | 1037 | |
90dda520 | 1038 | sysfs_remove_group(&dev->kobj, chip->vendor.attr_group); |
55a82ab3 | 1039 | tpm_bios_log_teardown(chip->bios_dir); |
1da177e4 | 1040 | |
10685a95 | 1041 | clear_bit(chip->dev_num, dev_mask); |
1da177e4 LT |
1042 | |
1043 | kfree(chip); | |
1044 | ||
e659a3fe | 1045 | put_device(dev); |
1da177e4 | 1046 | } |
e659a3fe | 1047 | EXPORT_SYMBOL_GPL(tpm_remove_hardware); |
1da177e4 LT |
1048 | |
1049 | static u8 savestate[] = { | |
1050 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
1051 | 0, 0, 0, 10, /* blob length (in bytes) */ | |
1052 | 0, 0, 0, 152 /* TPM_ORD_SaveState */ | |
1053 | }; | |
1054 | ||
1055 | /* | |
1056 | * We are about to suspend. Save the TPM state | |
1057 | * so that it can be restored. | |
1058 | */ | |
ce2c87d4 | 1059 | int tpm_pm_suspend(struct device *dev, pm_message_t pm_state) |
1da177e4 | 1060 | { |
ce2c87d4 | 1061 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
1062 | if (chip == NULL) |
1063 | return -ENODEV; | |
1064 | ||
1065 | tpm_transmit(chip, savestate, sizeof(savestate)); | |
1066 | return 0; | |
1067 | } | |
1da177e4 LT |
1068 | EXPORT_SYMBOL_GPL(tpm_pm_suspend); |
1069 | ||
1070 | /* | |
1071 | * Resume from a power safe. The BIOS already restored | |
1072 | * the TPM state. | |
1073 | */ | |
ce2c87d4 | 1074 | int tpm_pm_resume(struct device *dev) |
1da177e4 | 1075 | { |
ce2c87d4 | 1076 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
1077 | |
1078 | if (chip == NULL) | |
1079 | return -ENODEV; | |
1080 | ||
1da177e4 LT |
1081 | return 0; |
1082 | } | |
1da177e4 LT |
1083 | EXPORT_SYMBOL_GPL(tpm_pm_resume); |
1084 | ||
1085 | /* | |
1086 | * Called from tpm_<specific>.c probe function only for devices | |
1087 | * the driver has determined it should claim. Prior to calling | |
1088 | * this function the specific probe function has called pci_enable_device | |
1089 | * upon errant exit from this function specific probe function should call | |
1090 | * pci_disable_device | |
1091 | */ | |
e0dd03ca KJH |
1092 | struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vendor_specific |
1093 | *entry) | |
1da177e4 | 1094 | { |
6f9beccb KJH |
1095 | #define DEVNAME_SIZE 7 |
1096 | ||
1097 | char *devname; | |
1da177e4 | 1098 | struct tpm_chip *chip; |
1da177e4 LT |
1099 | |
1100 | /* Driver specific per-device data */ | |
b888c87b | 1101 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
8e39c933 PW |
1102 | devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL); |
1103 | ||
1104 | if (chip == NULL || devname == NULL) { | |
1105 | kfree(chip); | |
1106 | kfree(devname); | |
e0dd03ca | 1107 | return NULL; |
8e39c933 | 1108 | } |
1da177e4 | 1109 | |
d081d470 MK |
1110 | mutex_init(&chip->buffer_mutex); |
1111 | mutex_init(&chip->tpm_mutex); | |
1da177e4 LT |
1112 | INIT_LIST_HEAD(&chip->list); |
1113 | ||
c4028958 | 1114 | INIT_WORK(&chip->work, timeout_work); |
09e12f9f | 1115 | |
40565f19 JS |
1116 | setup_timer(&chip->user_read_timer, user_reader_timeout, |
1117 | (unsigned long)chip); | |
fe3fd483 | 1118 | |
90dda520 | 1119 | memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific)); |
1da177e4 | 1120 | |
10685a95 | 1121 | chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES); |
1da177e4 | 1122 | |
10685a95 | 1123 | if (chip->dev_num >= TPM_NUM_DEVICES) { |
b888c87b | 1124 | dev_err(dev, "No available tpm device numbers\n"); |
1da177e4 | 1125 | kfree(chip); |
e0dd03ca | 1126 | return NULL; |
1da177e4 | 1127 | } else if (chip->dev_num == 0) |
90dda520 | 1128 | chip->vendor.miscdev.minor = TPM_MINOR; |
1da177e4 | 1129 | else |
90dda520 | 1130 | chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR; |
1da177e4 | 1131 | |
10685a95 KJH |
1132 | set_bit(chip->dev_num, dev_mask); |
1133 | ||
6f9beccb | 1134 | scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num); |
90dda520 | 1135 | chip->vendor.miscdev.name = devname; |
1da177e4 | 1136 | |
94fbcded | 1137 | chip->vendor.miscdev.parent = dev; |
e659a3fe | 1138 | chip->dev = get_device(dev); |
1da177e4 | 1139 | |
90dda520 | 1140 | if (misc_register(&chip->vendor.miscdev)) { |
e659a3fe | 1141 | dev_err(chip->dev, |
1da177e4 | 1142 | "unable to misc_register %s, minor %d\n", |
90dda520 KJH |
1143 | chip->vendor.miscdev.name, |
1144 | chip->vendor.miscdev.minor); | |
e659a3fe | 1145 | put_device(dev); |
10685a95 | 1146 | clear_bit(chip->dev_num, dev_mask); |
1da177e4 | 1147 | kfree(chip); |
2e82636a | 1148 | kfree(devname); |
e0dd03ca | 1149 | return NULL; |
1da177e4 LT |
1150 | } |
1151 | ||
5e976d55 KH |
1152 | spin_lock(&driver_lock); |
1153 | ||
e659a3fe | 1154 | dev_set_drvdata(dev, chip); |
1da177e4 LT |
1155 | |
1156 | list_add(&chip->list, &tpm_chip_list); | |
1157 | ||
5e976d55 KH |
1158 | spin_unlock(&driver_lock); |
1159 | ||
f33d9bd5 JG |
1160 | if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) { |
1161 | list_del(&chip->list); | |
5d469ec0 | 1162 | misc_deregister(&chip->vendor.miscdev); |
f33d9bd5 JG |
1163 | put_device(dev); |
1164 | clear_bit(chip->dev_num, dev_mask); | |
1165 | kfree(chip); | |
1166 | kfree(devname); | |
1167 | return NULL; | |
1168 | } | |
1da177e4 | 1169 | |
55a82ab3 KJH |
1170 | chip->bios_dir = tpm_bios_log_setup(devname); |
1171 | ||
e0dd03ca | 1172 | return chip; |
1da177e4 | 1173 | } |
1da177e4 LT |
1174 | EXPORT_SYMBOL_GPL(tpm_register_hardware); |
1175 | ||
1da177e4 LT |
1176 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); |
1177 | MODULE_DESCRIPTION("TPM Driver"); | |
1178 | MODULE_VERSION("2.0"); | |
1179 | MODULE_LICENSE("GPL"); |