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)))); | |
08e96e48 | 560 | chip->vendor.duration[TPM_MEDIUM] = |
9e5b1b12 | 561 | usecs_to_jiffies(be32_to_cpu |
36b20020 KJH |
562 | (*((__be32 *) (data + |
563 | TPM_GET_CAP_RET_UINT32_2_IDX)))); | |
08e96e48 | 564 | chip->vendor.duration[TPM_LONG] = |
9e5b1b12 | 565 | usecs_to_jiffies(be32_to_cpu |
36b20020 KJH |
566 | (*((__be32 *) (data + |
567 | TPM_GET_CAP_RET_UINT32_3_IDX)))); | |
08e96e48 KJH |
568 | } |
569 | EXPORT_SYMBOL_GPL(tpm_get_timeouts); | |
570 | ||
571 | void tpm_continue_selftest(struct tpm_chip *chip) | |
572 | { | |
573 | u8 data[] = { | |
574 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
575 | 0, 0, 0, 10, /* length */ | |
576 | 0, 0, 0, 83, /* TPM_ORD_GetCapability */ | |
577 | }; | |
578 | ||
579 | tpm_transmit(chip, data, sizeof(data)); | |
580 | } | |
581 | EXPORT_SYMBOL_GPL(tpm_continue_selftest); | |
582 | ||
ec288bd3 MO |
583 | #define TPM_INTERNAL_RESULT_SIZE 200 |
584 | ||
08e96e48 KJH |
585 | ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr, |
586 | char *buf) | |
587 | { | |
ec288bd3 | 588 | u8 *data; |
08e96e48 KJH |
589 | ssize_t rc; |
590 | ||
591 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
592 | if (chip == NULL) | |
593 | return -ENODEV; | |
594 | ||
ec288bd3 MO |
595 | data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL); |
596 | if (!data) | |
597 | return -ENOMEM; | |
598 | ||
08e96e48 KJH |
599 | memcpy(data, tpm_cap, sizeof(tpm_cap)); |
600 | data[TPM_CAP_IDX] = TPM_CAP_FLAG; | |
601 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM; | |
602 | ||
ec288bd3 MO |
603 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
604 | "attemtping to determine the permanent enabled state"); | |
605 | if (rc) { | |
606 | kfree(data); | |
08e96e48 | 607 | return 0; |
ec288bd3 MO |
608 | } |
609 | ||
610 | rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]); | |
611 | ||
612 | kfree(data); | |
613 | return rc; | |
08e96e48 KJH |
614 | } |
615 | EXPORT_SYMBOL_GPL(tpm_show_enabled); | |
616 | ||
617 | ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr, | |
618 | char *buf) | |
619 | { | |
ec288bd3 | 620 | u8 *data; |
08e96e48 KJH |
621 | ssize_t rc; |
622 | ||
623 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
624 | if (chip == NULL) | |
625 | return -ENODEV; | |
626 | ||
ec288bd3 MO |
627 | data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL); |
628 | if (!data) | |
629 | return -ENOMEM; | |
630 | ||
08e96e48 KJH |
631 | memcpy(data, tpm_cap, sizeof(tpm_cap)); |
632 | data[TPM_CAP_IDX] = TPM_CAP_FLAG; | |
633 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM; | |
634 | ||
ec288bd3 MO |
635 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
636 | "attemtping to determine the permanent active state"); | |
637 | if (rc) { | |
638 | kfree(data); | |
08e96e48 | 639 | return 0; |
ec288bd3 MO |
640 | } |
641 | ||
642 | rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]); | |
643 | ||
644 | kfree(data); | |
645 | return rc; | |
08e96e48 KJH |
646 | } |
647 | EXPORT_SYMBOL_GPL(tpm_show_active); | |
648 | ||
649 | ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr, | |
650 | char *buf) | |
651 | { | |
ec288bd3 | 652 | u8 *data; |
08e96e48 KJH |
653 | ssize_t rc; |
654 | ||
655 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
656 | if (chip == NULL) | |
657 | return -ENODEV; | |
658 | ||
ec288bd3 MO |
659 | data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL); |
660 | if (!data) | |
661 | return -ENOMEM; | |
662 | ||
08e96e48 KJH |
663 | memcpy(data, tpm_cap, sizeof(tpm_cap)); |
664 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
665 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER; | |
666 | ||
ec288bd3 | 667 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
08e96e48 | 668 | "attempting to determine the owner state"); |
ec288bd3 MO |
669 | if (rc) { |
670 | kfree(data); | |
08e96e48 | 671 | return 0; |
ec288bd3 MO |
672 | } |
673 | ||
674 | rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]); | |
675 | ||
676 | kfree(data); | |
677 | return rc; | |
08e96e48 KJH |
678 | } |
679 | EXPORT_SYMBOL_GPL(tpm_show_owned); | |
680 | ||
681 | ssize_t tpm_show_temp_deactivated(struct device * dev, | |
682 | struct device_attribute * attr, char *buf) | |
683 | { | |
ec288bd3 | 684 | u8 *data; |
08e96e48 KJH |
685 | ssize_t rc; |
686 | ||
687 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
688 | if (chip == NULL) | |
689 | return -ENODEV; | |
690 | ||
ec288bd3 MO |
691 | data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL); |
692 | if (!data) | |
693 | return -ENOMEM; | |
694 | ||
08e96e48 KJH |
695 | memcpy(data, tpm_cap, sizeof(tpm_cap)); |
696 | data[TPM_CAP_IDX] = TPM_CAP_FLAG; | |
697 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL; | |
698 | ||
ec288bd3 | 699 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
08e96e48 | 700 | "attempting to determine the temporary state"); |
ec288bd3 MO |
701 | if (rc) { |
702 | kfree(data); | |
08e96e48 | 703 | return 0; |
ec288bd3 MO |
704 | } |
705 | ||
706 | rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]); | |
707 | ||
708 | kfree(data); | |
709 | return rc; | |
08e96e48 KJH |
710 | } |
711 | EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated); | |
712 | ||
dff37e4b | 713 | static const u8 pcrread[] = { |
1da177e4 LT |
714 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
715 | 0, 0, 0, 14, /* length */ | |
716 | 0, 0, 0, 21, /* TPM_ORD_PcrRead */ | |
717 | 0, 0, 0, 0 /* PCR index */ | |
718 | }; | |
719 | ||
6659ca2a KH |
720 | ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr, |
721 | char *buf) | |
1da177e4 | 722 | { |
ec288bd3 | 723 | u8 *data; |
beed53a1 | 724 | ssize_t rc; |
81179bb6 KH |
725 | int i, j, num_pcrs; |
726 | __be32 index; | |
1da177e4 LT |
727 | char *str = buf; |
728 | ||
e659a3fe | 729 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
730 | if (chip == NULL) |
731 | return -ENODEV; | |
732 | ||
ec288bd3 MO |
733 | data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL); |
734 | if (!data) | |
735 | return -ENOMEM; | |
736 | ||
beed53a1 KJH |
737 | memcpy(data, tpm_cap, sizeof(tpm_cap)); |
738 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
739 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR; | |
740 | ||
ec288bd3 | 741 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
beed53a1 | 742 | "attempting to determine the number of PCRS"); |
ec288bd3 MO |
743 | if (rc) { |
744 | kfree(data); | |
e234bc97 | 745 | return 0; |
ec288bd3 | 746 | } |
1da177e4 | 747 | |
81179bb6 | 748 | num_pcrs = be32_to_cpu(*((__be32 *) (data + 14))); |
1da177e4 LT |
749 | for (i = 0; i < num_pcrs; i++) { |
750 | memcpy(data, pcrread, sizeof(pcrread)); | |
751 | index = cpu_to_be32(i); | |
752 | memcpy(data + 10, &index, 4); | |
ec288bd3 | 753 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
beed53a1 KJH |
754 | "attempting to read a PCR"); |
755 | if (rc) | |
e234bc97 | 756 | goto out; |
1da177e4 LT |
757 | str += sprintf(str, "PCR-%02d: ", i); |
758 | for (j = 0; j < TPM_DIGEST_SIZE; j++) | |
759 | str += sprintf(str, "%02X ", *(data + 10 + j)); | |
760 | str += sprintf(str, "\n"); | |
761 | } | |
e234bc97 | 762 | out: |
ec288bd3 | 763 | kfree(data); |
1da177e4 LT |
764 | return str - buf; |
765 | } | |
6659ca2a | 766 | EXPORT_SYMBOL_GPL(tpm_show_pcrs); |
1da177e4 LT |
767 | |
768 | #define READ_PUBEK_RESULT_SIZE 314 | |
dff37e4b | 769 | static const u8 readpubek[] = { |
1da177e4 LT |
770 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
771 | 0, 0, 0, 30, /* length */ | |
772 | 0, 0, 0, 124, /* TPM_ORD_ReadPubek */ | |
773 | }; | |
774 | ||
6659ca2a KH |
775 | ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr, |
776 | char *buf) | |
1da177e4 | 777 | { |
2df7111f | 778 | u8 *data; |
beed53a1 | 779 | ssize_t err; |
81179bb6 | 780 | int i, rc; |
1da177e4 LT |
781 | char *str = buf; |
782 | ||
e659a3fe | 783 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
784 | if (chip == NULL) |
785 | return -ENODEV; | |
786 | ||
b888c87b | 787 | data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL); |
2df7111f KH |
788 | if (!data) |
789 | return -ENOMEM; | |
790 | ||
1da177e4 | 791 | memcpy(data, readpubek, sizeof(readpubek)); |
1da177e4 | 792 | |
beed53a1 KJH |
793 | err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE, |
794 | "attempting to read the PUBEK"); | |
795 | if (err) | |
34d6e075 | 796 | goto out; |
1da177e4 LT |
797 | |
798 | /* | |
799 | ignore header 10 bytes | |
800 | algorithm 32 bits (1 == RSA ) | |
801 | encscheme 16 bits | |
802 | sigscheme 16 bits | |
803 | parameters (RSA 12->bytes: keybit, #primes, expbit) | |
804 | keylenbytes 32 bits | |
805 | 256 byte modulus | |
806 | ignore checksum 20 bytes | |
807 | */ | |
808 | ||
1da177e4 LT |
809 | str += |
810 | sprintf(str, | |
811 | "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n" | |
812 | "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X" | |
813 | " %02X %02X %02X %02X %02X %02X %02X %02X\n" | |
814 | "Modulus length: %d\nModulus: \n", | |
815 | data[10], data[11], data[12], data[13], data[14], | |
816 | data[15], data[16], data[17], data[22], data[23], | |
817 | data[24], data[25], data[26], data[27], data[28], | |
818 | data[29], data[30], data[31], data[32], data[33], | |
1dda8abe | 819 | be32_to_cpu(*((__be32 *) (data + 34)))); |
1da177e4 LT |
820 | |
821 | for (i = 0; i < 256; i++) { | |
1dda8abe | 822 | str += sprintf(str, "%02X ", data[i + 38]); |
1da177e4 LT |
823 | if ((i + 1) % 16 == 0) |
824 | str += sprintf(str, "\n"); | |
825 | } | |
34d6e075 | 826 | out: |
beed53a1 | 827 | rc = str - buf; |
2df7111f KH |
828 | kfree(data); |
829 | return rc; | |
1da177e4 | 830 | } |
6659ca2a | 831 | EXPORT_SYMBOL_GPL(tpm_show_pubek); |
1da177e4 | 832 | |
beed53a1 | 833 | #define CAP_VERSION_1_1 6 |
08e96e48 | 834 | #define CAP_VERSION_1_2 0x1A |
beed53a1 | 835 | #define CAP_VERSION_IDX 13 |
dff37e4b | 836 | static const u8 cap_version[] = { |
1da177e4 LT |
837 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
838 | 0, 0, 0, 18, /* length */ | |
839 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
beed53a1 | 840 | 0, 0, 0, 0, |
1da177e4 LT |
841 | 0, 0, 0, 0 |
842 | }; | |
843 | ||
6659ca2a KH |
844 | ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr, |
845 | char *buf) | |
1da177e4 | 846 | { |
ec288bd3 | 847 | u8 *data; |
beed53a1 | 848 | ssize_t rc; |
1da177e4 LT |
849 | char *str = buf; |
850 | ||
e659a3fe | 851 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
852 | if (chip == NULL) |
853 | return -ENODEV; | |
854 | ||
ec288bd3 MO |
855 | data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL); |
856 | if (!data) | |
857 | return -ENOMEM; | |
858 | ||
beed53a1 KJH |
859 | memcpy(data, tpm_cap, sizeof(tpm_cap)); |
860 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
861 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER; | |
1da177e4 | 862 | |
ec288bd3 | 863 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
beed53a1 | 864 | "attempting to determine the manufacturer"); |
ec288bd3 MO |
865 | if (rc) { |
866 | kfree(data); | |
beed53a1 | 867 | return 0; |
ec288bd3 | 868 | } |
1da177e4 LT |
869 | |
870 | str += sprintf(str, "Manufacturer: 0x%x\n", | |
beed53a1 | 871 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)))); |
1da177e4 LT |
872 | |
873 | memcpy(data, cap_version, sizeof(cap_version)); | |
beed53a1 | 874 | data[CAP_VERSION_IDX] = CAP_VERSION_1_1; |
ec288bd3 | 875 | rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE, |
beed53a1 KJH |
876 | "attempting to determine the 1.1 version"); |
877 | if (rc) | |
878 | goto out; | |
1da177e4 | 879 | |
beed53a1 KJH |
880 | str += sprintf(str, |
881 | "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
882 | (int) data[14], (int) data[15], (int) data[16], | |
883 | (int) data[17]); | |
1da177e4 | 884 | |
beed53a1 | 885 | out: |
ec288bd3 | 886 | kfree(data); |
1da177e4 LT |
887 | return str - buf; |
888 | } | |
6659ca2a KH |
889 | EXPORT_SYMBOL_GPL(tpm_show_caps); |
890 | ||
08e96e48 KJH |
891 | ssize_t tpm_show_caps_1_2(struct device * dev, |
892 | struct device_attribute * attr, char *buf) | |
893 | { | |
ec288bd3 | 894 | u8 *data; |
08e96e48 KJH |
895 | ssize_t len; |
896 | char *str = buf; | |
897 | ||
898 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
899 | if (chip == NULL) | |
900 | return -ENODEV; | |
901 | ||
ec288bd3 MO |
902 | data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL); |
903 | if (!data) | |
904 | return -ENOMEM; | |
905 | ||
08e96e48 KJH |
906 | memcpy(data, tpm_cap, sizeof(tpm_cap)); |
907 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
908 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER; | |
909 | ||
ec288bd3 MO |
910 | len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE); |
911 | if (len <= TPM_ERROR_SIZE) { | |
08e96e48 KJH |
912 | dev_dbg(chip->dev, "A TPM error (%d) occurred " |
913 | "attempting to determine the manufacturer\n", | |
914 | be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)))); | |
ec288bd3 | 915 | kfree(data); |
08e96e48 KJH |
916 | return 0; |
917 | } | |
918 | ||
919 | str += sprintf(str, "Manufacturer: 0x%x\n", | |
920 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)))); | |
921 | ||
922 | memcpy(data, cap_version, sizeof(cap_version)); | |
923 | data[CAP_VERSION_IDX] = CAP_VERSION_1_2; | |
924 | ||
ec288bd3 MO |
925 | len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE); |
926 | if (len <= TPM_ERROR_SIZE) { | |
08e96e48 KJH |
927 | dev_err(chip->dev, "A TPM error (%d) occurred " |
928 | "attempting to determine the 1.2 version\n", | |
929 | be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)))); | |
930 | goto out; | |
931 | } | |
932 | str += sprintf(str, | |
933 | "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
934 | (int) data[16], (int) data[17], (int) data[18], | |
935 | (int) data[19]); | |
936 | ||
937 | out: | |
ec288bd3 | 938 | kfree(data); |
08e96e48 KJH |
939 | return str - buf; |
940 | } | |
941 | EXPORT_SYMBOL_GPL(tpm_show_caps_1_2); | |
942 | ||
6659ca2a KH |
943 | ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr, |
944 | const char *buf, size_t count) | |
945 | { | |
946 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
947 | if (chip == NULL) | |
948 | return 0; | |
949 | ||
90dda520 | 950 | chip->vendor.cancel(chip); |
6659ca2a KH |
951 | return count; |
952 | } | |
953 | EXPORT_SYMBOL_GPL(tpm_store_cancel); | |
1da177e4 | 954 | |
1da177e4 LT |
955 | /* |
956 | * Device file system interface to the TPM | |
f89c5edb RA |
957 | * |
958 | * It's assured that the chip will be opened just once, | |
959 | * by the check of is_open variable, which is protected | |
960 | * by driver_lock. | |
1da177e4 LT |
961 | */ |
962 | int tpm_open(struct inode *inode, struct file *file) | |
963 | { | |
f02a9364 | 964 | int minor = iminor(inode); |
1da177e4 LT |
965 | struct tpm_chip *chip = NULL, *pos; |
966 | ||
f02a9364 RA |
967 | rcu_read_lock(); |
968 | list_for_each_entry_rcu(pos, &tpm_chip_list, list) { | |
90dda520 | 969 | if (pos->vendor.miscdev.minor == minor) { |
1da177e4 | 970 | chip = pos; |
f02a9364 | 971 | get_device(chip->dev); |
1da177e4 LT |
972 | break; |
973 | } | |
974 | } | |
f02a9364 | 975 | rcu_read_unlock(); |
1da177e4 | 976 | |
f02a9364 RA |
977 | if (!chip) |
978 | return -ENODEV; | |
1da177e4 | 979 | |
dc36d32c | 980 | if (test_and_set_bit(0, &chip->is_open)) { |
b888c87b | 981 | dev_dbg(chip->dev, "Another process owns this TPM\n"); |
f02a9364 RA |
982 | put_device(chip->dev); |
983 | return -EBUSY; | |
1da177e4 LT |
984 | } |
985 | ||
1da177e4 LT |
986 | chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); |
987 | if (chip->data_buffer == NULL) { | |
dc36d32c | 988 | clear_bit(0, &chip->is_open); |
e659a3fe | 989 | put_device(chip->dev); |
1da177e4 LT |
990 | return -ENOMEM; |
991 | } | |
992 | ||
993 | atomic_set(&chip->data_pending, 0); | |
994 | ||
995 | file->private_data = chip; | |
996 | return 0; | |
1da177e4 | 997 | } |
1da177e4 LT |
998 | EXPORT_SYMBOL_GPL(tpm_open); |
999 | ||
f02a9364 RA |
1000 | /* |
1001 | * Called on file close | |
1002 | */ | |
1da177e4 LT |
1003 | int tpm_release(struct inode *inode, struct file *file) |
1004 | { | |
1005 | struct tpm_chip *chip = file->private_data; | |
1da177e4 | 1006 | |
4bdec11f | 1007 | del_singleshot_timer_sync(&chip->user_read_timer); |
8e39c933 | 1008 | flush_scheduled_work(); |
5e976d55 | 1009 | file->private_data = NULL; |
1da177e4 | 1010 | atomic_set(&chip->data_pending, 0); |
f02a9364 | 1011 | kfree(chip->data_buffer); |
dc36d32c | 1012 | clear_bit(0, &chip->is_open); |
e659a3fe | 1013 | put_device(chip->dev); |
1da177e4 LT |
1014 | return 0; |
1015 | } | |
1da177e4 LT |
1016 | EXPORT_SYMBOL_GPL(tpm_release); |
1017 | ||
b888c87b | 1018 | ssize_t tpm_write(struct file *file, const char __user *buf, |
3c2f606a | 1019 | size_t size, loff_t *off) |
1da177e4 LT |
1020 | { |
1021 | struct tpm_chip *chip = file->private_data; | |
01476001 | 1022 | size_t in_size = size, out_size; |
1da177e4 LT |
1023 | |
1024 | /* cannot perform a write until the read has cleared | |
1025 | either via tpm_read or a user_read_timer timeout */ | |
700d8bdc NA |
1026 | while (atomic_read(&chip->data_pending) != 0) |
1027 | msleep(TPM_TIMEOUT); | |
1da177e4 | 1028 | |
d081d470 | 1029 | mutex_lock(&chip->buffer_mutex); |
1da177e4 LT |
1030 | |
1031 | if (in_size > TPM_BUFSIZE) | |
1032 | in_size = TPM_BUFSIZE; | |
1033 | ||
1034 | if (copy_from_user | |
1035 | (chip->data_buffer, (void __user *) buf, in_size)) { | |
d081d470 | 1036 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
1037 | return -EFAULT; |
1038 | } | |
1039 | ||
1040 | /* atomic tpm command send and result receive */ | |
1041 | out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE); | |
1042 | ||
1043 | atomic_set(&chip->data_pending, out_size); | |
d081d470 | 1044 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
1045 | |
1046 | /* Set a timeout by which the reader must come claim the result */ | |
fe3fd483 | 1047 | mod_timer(&chip->user_read_timer, jiffies + (60 * HZ)); |
1da177e4 LT |
1048 | |
1049 | return in_size; | |
1050 | } | |
1da177e4 LT |
1051 | EXPORT_SYMBOL_GPL(tpm_write); |
1052 | ||
3c2f606a KJH |
1053 | ssize_t tpm_read(struct file *file, char __user *buf, |
1054 | size_t size, loff_t *off) | |
1da177e4 LT |
1055 | { |
1056 | struct tpm_chip *chip = file->private_data; | |
01476001 | 1057 | ssize_t ret_size; |
1da177e4 | 1058 | |
5b44bd58 | 1059 | del_singleshot_timer_sync(&chip->user_read_timer); |
ba396115 | 1060 | flush_scheduled_work(); |
5b44bd58 KH |
1061 | ret_size = atomic_read(&chip->data_pending); |
1062 | atomic_set(&chip->data_pending, 0); | |
1063 | if (ret_size > 0) { /* relay data */ | |
1064 | if (size < ret_size) | |
1065 | ret_size = size; | |
1da177e4 | 1066 | |
d081d470 | 1067 | mutex_lock(&chip->buffer_mutex); |
f6a2382c | 1068 | if (copy_to_user(buf, chip->data_buffer, ret_size)) |
5b44bd58 | 1069 | ret_size = -EFAULT; |
d081d470 | 1070 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
1071 | } |
1072 | ||
1073 | return ret_size; | |
1074 | } | |
1da177e4 LT |
1075 | EXPORT_SYMBOL_GPL(tpm_read); |
1076 | ||
e659a3fe | 1077 | void tpm_remove_hardware(struct device *dev) |
1da177e4 | 1078 | { |
e659a3fe | 1079 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
1080 | |
1081 | if (chip == NULL) { | |
e659a3fe | 1082 | dev_err(dev, "No device data found\n"); |
1da177e4 LT |
1083 | return; |
1084 | } | |
1085 | ||
1086 | spin_lock(&driver_lock); | |
f02a9364 | 1087 | list_del_rcu(&chip->list); |
1da177e4 | 1088 | spin_unlock(&driver_lock); |
f02a9364 | 1089 | synchronize_rcu(); |
1da177e4 | 1090 | |
90dda520 | 1091 | misc_deregister(&chip->vendor.miscdev); |
90dda520 | 1092 | sysfs_remove_group(&dev->kobj, chip->vendor.attr_group); |
55a82ab3 | 1093 | tpm_bios_log_teardown(chip->bios_dir); |
1da177e4 | 1094 | |
5bd91f18 RM |
1095 | /* write it this way to be explicit (chip->dev == dev) */ |
1096 | put_device(chip->dev); | |
1da177e4 | 1097 | } |
e659a3fe | 1098 | EXPORT_SYMBOL_GPL(tpm_remove_hardware); |
1da177e4 | 1099 | |
1da177e4 LT |
1100 | /* |
1101 | * We are about to suspend. Save the TPM state | |
1102 | * so that it can be restored. | |
1103 | */ | |
ce2c87d4 | 1104 | int tpm_pm_suspend(struct device *dev, pm_message_t pm_state) |
1da177e4 | 1105 | { |
ce2c87d4 | 1106 | struct tpm_chip *chip = dev_get_drvdata(dev); |
2490c681 DS |
1107 | u8 savestate[] = { |
1108 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
1109 | 0, 0, 0, 10, /* blob length (in bytes) */ | |
1110 | 0, 0, 0, 152 /* TPM_ORD_SaveState */ | |
1111 | }; | |
1112 | ||
1da177e4 LT |
1113 | if (chip == NULL) |
1114 | return -ENODEV; | |
1115 | ||
1116 | tpm_transmit(chip, savestate, sizeof(savestate)); | |
1117 | return 0; | |
1118 | } | |
1da177e4 LT |
1119 | EXPORT_SYMBOL_GPL(tpm_pm_suspend); |
1120 | ||
1121 | /* | |
1122 | * Resume from a power safe. The BIOS already restored | |
1123 | * the TPM state. | |
1124 | */ | |
ce2c87d4 | 1125 | int tpm_pm_resume(struct device *dev) |
1da177e4 | 1126 | { |
ce2c87d4 | 1127 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
1128 | |
1129 | if (chip == NULL) | |
1130 | return -ENODEV; | |
1131 | ||
1da177e4 LT |
1132 | return 0; |
1133 | } | |
1da177e4 LT |
1134 | EXPORT_SYMBOL_GPL(tpm_pm_resume); |
1135 | ||
253115b7 RA |
1136 | /* In case vendor provided release function, call it too.*/ |
1137 | ||
1138 | void tpm_dev_vendor_release(struct tpm_chip *chip) | |
1139 | { | |
1140 | if (chip->vendor.release) | |
1141 | chip->vendor.release(chip->dev); | |
1142 | ||
1143 | clear_bit(chip->dev_num, dev_mask); | |
1144 | kfree(chip->vendor.miscdev.name); | |
1145 | } | |
1146 | EXPORT_SYMBOL_GPL(tpm_dev_vendor_release); | |
1147 | ||
1148 | ||
5bd91f18 RM |
1149 | /* |
1150 | * Once all references to platform device are down to 0, | |
1151 | * release all allocated structures. | |
5bd91f18 RM |
1152 | */ |
1153 | static void tpm_dev_release(struct device *dev) | |
1154 | { | |
1155 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
1156 | ||
253115b7 | 1157 | tpm_dev_vendor_release(chip); |
5bd91f18 | 1158 | |
253115b7 | 1159 | chip->release(dev); |
5bd91f18 RM |
1160 | kfree(chip); |
1161 | } | |
253115b7 | 1162 | EXPORT_SYMBOL_GPL(tpm_dev_release); |
5bd91f18 | 1163 | |
1da177e4 LT |
1164 | /* |
1165 | * Called from tpm_<specific>.c probe function only for devices | |
1166 | * the driver has determined it should claim. Prior to calling | |
1167 | * this function the specific probe function has called pci_enable_device | |
1168 | * upon errant exit from this function specific probe function should call | |
1169 | * pci_disable_device | |
1170 | */ | |
f02a9364 RA |
1171 | struct tpm_chip *tpm_register_hardware(struct device *dev, |
1172 | const struct tpm_vendor_specific *entry) | |
1da177e4 | 1173 | { |
6f9beccb KJH |
1174 | #define DEVNAME_SIZE 7 |
1175 | ||
1176 | char *devname; | |
1da177e4 | 1177 | struct tpm_chip *chip; |
1da177e4 LT |
1178 | |
1179 | /* Driver specific per-device data */ | |
b888c87b | 1180 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
8e39c933 PW |
1181 | devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL); |
1182 | ||
1183 | if (chip == NULL || devname == NULL) { | |
1184 | kfree(chip); | |
1185 | kfree(devname); | |
e0dd03ca | 1186 | return NULL; |
8e39c933 | 1187 | } |
1da177e4 | 1188 | |
d081d470 MK |
1189 | mutex_init(&chip->buffer_mutex); |
1190 | mutex_init(&chip->tpm_mutex); | |
1da177e4 LT |
1191 | INIT_LIST_HEAD(&chip->list); |
1192 | ||
c4028958 | 1193 | INIT_WORK(&chip->work, timeout_work); |
09e12f9f | 1194 | |
40565f19 JS |
1195 | setup_timer(&chip->user_read_timer, user_reader_timeout, |
1196 | (unsigned long)chip); | |
fe3fd483 | 1197 | |
90dda520 | 1198 | memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific)); |
1da177e4 | 1199 | |
10685a95 | 1200 | chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES); |
1da177e4 | 1201 | |
10685a95 | 1202 | if (chip->dev_num >= TPM_NUM_DEVICES) { |
b888c87b | 1203 | dev_err(dev, "No available tpm device numbers\n"); |
1da177e4 | 1204 | kfree(chip); |
e0dd03ca | 1205 | return NULL; |
1da177e4 | 1206 | } else if (chip->dev_num == 0) |
90dda520 | 1207 | chip->vendor.miscdev.minor = TPM_MINOR; |
1da177e4 | 1208 | else |
90dda520 | 1209 | chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR; |
1da177e4 | 1210 | |
10685a95 KJH |
1211 | set_bit(chip->dev_num, dev_mask); |
1212 | ||
6f9beccb | 1213 | scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num); |
90dda520 | 1214 | chip->vendor.miscdev.name = devname; |
1da177e4 | 1215 | |
94fbcded | 1216 | chip->vendor.miscdev.parent = dev; |
e659a3fe | 1217 | chip->dev = get_device(dev); |
5bd91f18 RM |
1218 | chip->release = dev->release; |
1219 | dev->release = tpm_dev_release; | |
1220 | dev_set_drvdata(dev, chip); | |
1da177e4 | 1221 | |
90dda520 | 1222 | if (misc_register(&chip->vendor.miscdev)) { |
e659a3fe | 1223 | dev_err(chip->dev, |
1da177e4 | 1224 | "unable to misc_register %s, minor %d\n", |
90dda520 KJH |
1225 | chip->vendor.miscdev.name, |
1226 | chip->vendor.miscdev.minor); | |
5bd91f18 | 1227 | put_device(chip->dev); |
e0dd03ca | 1228 | return NULL; |
1da177e4 LT |
1229 | } |
1230 | ||
f33d9bd5 | 1231 | if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) { |
5d469ec0 | 1232 | misc_deregister(&chip->vendor.miscdev); |
5bd91f18 | 1233 | put_device(chip->dev); |
f02a9364 | 1234 | |
f33d9bd5 JG |
1235 | return NULL; |
1236 | } | |
1da177e4 | 1237 | |
55a82ab3 KJH |
1238 | chip->bios_dir = tpm_bios_log_setup(devname); |
1239 | ||
f02a9364 RA |
1240 | /* Make chip available */ |
1241 | spin_lock(&driver_lock); | |
1242 | list_add_rcu(&chip->list, &tpm_chip_list); | |
1243 | spin_unlock(&driver_lock); | |
1244 | ||
e0dd03ca | 1245 | return chip; |
1da177e4 | 1246 | } |
1da177e4 LT |
1247 | EXPORT_SYMBOL_GPL(tpm_register_hardware); |
1248 | ||
1da177e4 LT |
1249 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); |
1250 | MODULE_DESCRIPTION("TPM Driver"); | |
1251 | MODULE_VERSION("2.0"); | |
1252 | MODULE_LICENSE("GPL"); |