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) | |
36b20020 | 528 | chip->vendor.timeout_a = msecs_to_jiffies(timeout); |
08e96e48 KJH |
529 | timeout = |
530 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX))); | |
531 | if (timeout) | |
36b20020 | 532 | chip->vendor.timeout_b = msecs_to_jiffies(timeout); |
08e96e48 KJH |
533 | timeout = |
534 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX))); | |
535 | if (timeout) | |
36b20020 | 536 | chip->vendor.timeout_c = msecs_to_jiffies(timeout); |
08e96e48 KJH |
537 | timeout = |
538 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX))); | |
539 | if (timeout) | |
36b20020 | 540 | chip->vendor.timeout_d = msecs_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] = | |
36b20020 KJH |
557 | msecs_to_jiffies(be32_to_cpu |
558 | (*((__be32 *) (data + | |
559 | TPM_GET_CAP_RET_UINT32_1_IDX)))); | |
08e96e48 | 560 | chip->vendor.duration[TPM_MEDIUM] = |
36b20020 KJH |
561 | msecs_to_jiffies(be32_to_cpu |
562 | (*((__be32 *) (data + | |
563 | TPM_GET_CAP_RET_UINT32_2_IDX)))); | |
08e96e48 | 564 | chip->vendor.duration[TPM_LONG] = |
36b20020 KJH |
565 | msecs_to_jiffies(be32_to_cpu |
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 | ||
583 | ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr, | |
584 | char *buf) | |
585 | { | |
586 | u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)]; | |
587 | ssize_t rc; | |
588 | ||
589 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
590 | if (chip == NULL) | |
591 | return -ENODEV; | |
592 | ||
593 | memcpy(data, tpm_cap, sizeof(tpm_cap)); | |
594 | data[TPM_CAP_IDX] = TPM_CAP_FLAG; | |
595 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM; | |
596 | ||
597 | rc = transmit_cmd(chip, data, sizeof(data), | |
598 | "attemtping to determine the permanent state"); | |
599 | if (rc) | |
600 | return 0; | |
601 | return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]); | |
602 | } | |
603 | EXPORT_SYMBOL_GPL(tpm_show_enabled); | |
604 | ||
605 | ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr, | |
606 | char *buf) | |
607 | { | |
608 | u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)]; | |
609 | ssize_t rc; | |
610 | ||
611 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
612 | if (chip == NULL) | |
613 | return -ENODEV; | |
614 | ||
615 | memcpy(data, tpm_cap, sizeof(tpm_cap)); | |
616 | data[TPM_CAP_IDX] = TPM_CAP_FLAG; | |
617 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM; | |
618 | ||
619 | rc = transmit_cmd(chip, data, sizeof(data), | |
620 | "attemtping to determine the permanent state"); | |
621 | if (rc) | |
622 | return 0; | |
623 | return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]); | |
624 | } | |
625 | EXPORT_SYMBOL_GPL(tpm_show_active); | |
626 | ||
627 | ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr, | |
628 | char *buf) | |
629 | { | |
630 | u8 data[sizeof(tpm_cap)]; | |
631 | ssize_t rc; | |
632 | ||
633 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
634 | if (chip == NULL) | |
635 | return -ENODEV; | |
636 | ||
637 | memcpy(data, tpm_cap, sizeof(tpm_cap)); | |
638 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
639 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER; | |
640 | ||
641 | rc = transmit_cmd(chip, data, sizeof(data), | |
642 | "attempting to determine the owner state"); | |
643 | if (rc) | |
644 | return 0; | |
645 | return sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]); | |
646 | } | |
647 | EXPORT_SYMBOL_GPL(tpm_show_owned); | |
648 | ||
649 | ssize_t tpm_show_temp_deactivated(struct device * dev, | |
650 | struct device_attribute * attr, char *buf) | |
651 | { | |
652 | u8 data[sizeof(tpm_cap)]; | |
653 | ssize_t rc; | |
654 | ||
655 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
656 | if (chip == NULL) | |
657 | return -ENODEV; | |
658 | ||
659 | memcpy(data, tpm_cap, sizeof(tpm_cap)); | |
660 | data[TPM_CAP_IDX] = TPM_CAP_FLAG; | |
661 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL; | |
662 | ||
663 | rc = transmit_cmd(chip, data, sizeof(data), | |
664 | "attempting to determine the temporary state"); | |
665 | if (rc) | |
666 | return 0; | |
667 | return sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]); | |
668 | } | |
669 | EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated); | |
670 | ||
dff37e4b | 671 | static const u8 pcrread[] = { |
1da177e4 LT |
672 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
673 | 0, 0, 0, 14, /* length */ | |
674 | 0, 0, 0, 21, /* TPM_ORD_PcrRead */ | |
675 | 0, 0, 0, 0 /* PCR index */ | |
676 | }; | |
677 | ||
6659ca2a KH |
678 | ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr, |
679 | char *buf) | |
1da177e4 | 680 | { |
08e96e48 | 681 | u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(pcrread)), 30)]; |
beed53a1 | 682 | ssize_t rc; |
81179bb6 KH |
683 | int i, j, num_pcrs; |
684 | __be32 index; | |
1da177e4 LT |
685 | char *str = buf; |
686 | ||
e659a3fe | 687 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
688 | if (chip == NULL) |
689 | return -ENODEV; | |
690 | ||
beed53a1 KJH |
691 | memcpy(data, tpm_cap, sizeof(tpm_cap)); |
692 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
693 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR; | |
694 | ||
695 | rc = transmit_cmd(chip, data, sizeof(data), | |
696 | "attempting to determine the number of PCRS"); | |
697 | if (rc) | |
e234bc97 | 698 | return 0; |
1da177e4 | 699 | |
81179bb6 | 700 | num_pcrs = be32_to_cpu(*((__be32 *) (data + 14))); |
1da177e4 LT |
701 | for (i = 0; i < num_pcrs; i++) { |
702 | memcpy(data, pcrread, sizeof(pcrread)); | |
703 | index = cpu_to_be32(i); | |
704 | memcpy(data + 10, &index, 4); | |
beed53a1 KJH |
705 | rc = transmit_cmd(chip, data, sizeof(data), |
706 | "attempting to read a PCR"); | |
707 | if (rc) | |
e234bc97 | 708 | goto out; |
1da177e4 LT |
709 | str += sprintf(str, "PCR-%02d: ", i); |
710 | for (j = 0; j < TPM_DIGEST_SIZE; j++) | |
711 | str += sprintf(str, "%02X ", *(data + 10 + j)); | |
712 | str += sprintf(str, "\n"); | |
713 | } | |
e234bc97 | 714 | out: |
1da177e4 LT |
715 | return str - buf; |
716 | } | |
6659ca2a | 717 | EXPORT_SYMBOL_GPL(tpm_show_pcrs); |
1da177e4 LT |
718 | |
719 | #define READ_PUBEK_RESULT_SIZE 314 | |
dff37e4b | 720 | static const u8 readpubek[] = { |
1da177e4 LT |
721 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
722 | 0, 0, 0, 30, /* length */ | |
723 | 0, 0, 0, 124, /* TPM_ORD_ReadPubek */ | |
724 | }; | |
725 | ||
6659ca2a KH |
726 | ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr, |
727 | char *buf) | |
1da177e4 | 728 | { |
2df7111f | 729 | u8 *data; |
beed53a1 | 730 | ssize_t err; |
81179bb6 | 731 | int i, rc; |
1da177e4 LT |
732 | char *str = buf; |
733 | ||
e659a3fe | 734 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
735 | if (chip == NULL) |
736 | return -ENODEV; | |
737 | ||
b888c87b | 738 | data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL); |
2df7111f KH |
739 | if (!data) |
740 | return -ENOMEM; | |
741 | ||
1da177e4 | 742 | memcpy(data, readpubek, sizeof(readpubek)); |
1da177e4 | 743 | |
beed53a1 KJH |
744 | err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE, |
745 | "attempting to read the PUBEK"); | |
746 | if (err) | |
34d6e075 | 747 | goto out; |
1da177e4 LT |
748 | |
749 | /* | |
750 | ignore header 10 bytes | |
751 | algorithm 32 bits (1 == RSA ) | |
752 | encscheme 16 bits | |
753 | sigscheme 16 bits | |
754 | parameters (RSA 12->bytes: keybit, #primes, expbit) | |
755 | keylenbytes 32 bits | |
756 | 256 byte modulus | |
757 | ignore checksum 20 bytes | |
758 | */ | |
759 | ||
1da177e4 LT |
760 | str += |
761 | sprintf(str, | |
762 | "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n" | |
763 | "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X" | |
764 | " %02X %02X %02X %02X %02X %02X %02X %02X\n" | |
765 | "Modulus length: %d\nModulus: \n", | |
766 | data[10], data[11], data[12], data[13], data[14], | |
767 | data[15], data[16], data[17], data[22], data[23], | |
768 | data[24], data[25], data[26], data[27], data[28], | |
769 | data[29], data[30], data[31], data[32], data[33], | |
1dda8abe | 770 | be32_to_cpu(*((__be32 *) (data + 34)))); |
1da177e4 LT |
771 | |
772 | for (i = 0; i < 256; i++) { | |
1dda8abe | 773 | str += sprintf(str, "%02X ", data[i + 38]); |
1da177e4 LT |
774 | if ((i + 1) % 16 == 0) |
775 | str += sprintf(str, "\n"); | |
776 | } | |
34d6e075 | 777 | out: |
beed53a1 | 778 | rc = str - buf; |
2df7111f KH |
779 | kfree(data); |
780 | return rc; | |
1da177e4 | 781 | } |
6659ca2a | 782 | EXPORT_SYMBOL_GPL(tpm_show_pubek); |
1da177e4 | 783 | |
beed53a1 | 784 | #define CAP_VERSION_1_1 6 |
08e96e48 | 785 | #define CAP_VERSION_1_2 0x1A |
beed53a1 | 786 | #define CAP_VERSION_IDX 13 |
dff37e4b | 787 | static const u8 cap_version[] = { |
1da177e4 LT |
788 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
789 | 0, 0, 0, 18, /* length */ | |
790 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
beed53a1 | 791 | 0, 0, 0, 0, |
1da177e4 LT |
792 | 0, 0, 0, 0 |
793 | }; | |
794 | ||
6659ca2a KH |
795 | ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr, |
796 | char *buf) | |
1da177e4 | 797 | { |
08e96e48 | 798 | u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)]; |
beed53a1 | 799 | ssize_t rc; |
1da177e4 LT |
800 | char *str = buf; |
801 | ||
e659a3fe | 802 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
803 | if (chip == NULL) |
804 | return -ENODEV; | |
805 | ||
beed53a1 KJH |
806 | memcpy(data, tpm_cap, sizeof(tpm_cap)); |
807 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
808 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER; | |
1da177e4 | 809 | |
beed53a1 KJH |
810 | rc = transmit_cmd(chip, data, sizeof(data), |
811 | "attempting to determine the manufacturer"); | |
812 | if (rc) | |
813 | return 0; | |
1da177e4 LT |
814 | |
815 | str += sprintf(str, "Manufacturer: 0x%x\n", | |
beed53a1 | 816 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)))); |
1da177e4 LT |
817 | |
818 | memcpy(data, cap_version, sizeof(cap_version)); | |
beed53a1 KJH |
819 | data[CAP_VERSION_IDX] = CAP_VERSION_1_1; |
820 | rc = transmit_cmd(chip, data, sizeof(data), | |
821 | "attempting to determine the 1.1 version"); | |
822 | if (rc) | |
823 | goto out; | |
1da177e4 | 824 | |
beed53a1 KJH |
825 | str += sprintf(str, |
826 | "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
827 | (int) data[14], (int) data[15], (int) data[16], | |
828 | (int) data[17]); | |
1da177e4 | 829 | |
beed53a1 | 830 | out: |
1da177e4 LT |
831 | return str - buf; |
832 | } | |
6659ca2a KH |
833 | EXPORT_SYMBOL_GPL(tpm_show_caps); |
834 | ||
08e96e48 KJH |
835 | ssize_t tpm_show_caps_1_2(struct device * dev, |
836 | struct device_attribute * attr, char *buf) | |
837 | { | |
838 | u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)]; | |
839 | ssize_t len; | |
840 | char *str = buf; | |
841 | ||
842 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
843 | if (chip == NULL) | |
844 | return -ENODEV; | |
845 | ||
846 | memcpy(data, tpm_cap, sizeof(tpm_cap)); | |
847 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
848 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER; | |
849 | ||
850 | if ((len = tpm_transmit(chip, data, sizeof(data))) <= | |
851 | TPM_ERROR_SIZE) { | |
852 | dev_dbg(chip->dev, "A TPM error (%d) occurred " | |
853 | "attempting to determine the manufacturer\n", | |
854 | be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)))); | |
855 | return 0; | |
856 | } | |
857 | ||
858 | str += sprintf(str, "Manufacturer: 0x%x\n", | |
859 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)))); | |
860 | ||
861 | memcpy(data, cap_version, sizeof(cap_version)); | |
862 | data[CAP_VERSION_IDX] = CAP_VERSION_1_2; | |
863 | ||
864 | if ((len = tpm_transmit(chip, data, sizeof(data))) <= | |
865 | TPM_ERROR_SIZE) { | |
866 | dev_err(chip->dev, "A TPM error (%d) occurred " | |
867 | "attempting to determine the 1.2 version\n", | |
868 | be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)))); | |
869 | goto out; | |
870 | } | |
871 | str += sprintf(str, | |
872 | "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
873 | (int) data[16], (int) data[17], (int) data[18], | |
874 | (int) data[19]); | |
875 | ||
876 | out: | |
877 | return str - buf; | |
878 | } | |
879 | EXPORT_SYMBOL_GPL(tpm_show_caps_1_2); | |
880 | ||
6659ca2a KH |
881 | ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr, |
882 | const char *buf, size_t count) | |
883 | { | |
884 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
885 | if (chip == NULL) | |
886 | return 0; | |
887 | ||
90dda520 | 888 | chip->vendor.cancel(chip); |
6659ca2a KH |
889 | return count; |
890 | } | |
891 | EXPORT_SYMBOL_GPL(tpm_store_cancel); | |
1da177e4 | 892 | |
1da177e4 LT |
893 | /* |
894 | * Device file system interface to the TPM | |
895 | */ | |
896 | int tpm_open(struct inode *inode, struct file *file) | |
897 | { | |
898 | int rc = 0, minor = iminor(inode); | |
899 | struct tpm_chip *chip = NULL, *pos; | |
900 | ||
25368ca5 | 901 | lock_kernel(); |
1da177e4 LT |
902 | spin_lock(&driver_lock); |
903 | ||
904 | list_for_each_entry(pos, &tpm_chip_list, list) { | |
90dda520 | 905 | if (pos->vendor.miscdev.minor == minor) { |
1da177e4 LT |
906 | chip = pos; |
907 | break; | |
908 | } | |
909 | } | |
910 | ||
911 | if (chip == NULL) { | |
912 | rc = -ENODEV; | |
913 | goto err_out; | |
914 | } | |
915 | ||
916 | if (chip->num_opens) { | |
b888c87b | 917 | dev_dbg(chip->dev, "Another process owns this TPM\n"); |
1da177e4 LT |
918 | rc = -EBUSY; |
919 | goto err_out; | |
920 | } | |
921 | ||
922 | chip->num_opens++; | |
e659a3fe | 923 | get_device(chip->dev); |
1da177e4 LT |
924 | |
925 | spin_unlock(&driver_lock); | |
926 | ||
927 | chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); | |
928 | if (chip->data_buffer == NULL) { | |
929 | chip->num_opens--; | |
e659a3fe | 930 | put_device(chip->dev); |
25368ca5 | 931 | unlock_kernel(); |
1da177e4 LT |
932 | return -ENOMEM; |
933 | } | |
934 | ||
935 | atomic_set(&chip->data_pending, 0); | |
936 | ||
937 | file->private_data = chip; | |
25368ca5 | 938 | unlock_kernel(); |
1da177e4 LT |
939 | return 0; |
940 | ||
941 | err_out: | |
942 | spin_unlock(&driver_lock); | |
25368ca5 | 943 | unlock_kernel(); |
1da177e4 LT |
944 | return rc; |
945 | } | |
1da177e4 LT |
946 | EXPORT_SYMBOL_GPL(tpm_open); |
947 | ||
948 | int tpm_release(struct inode *inode, struct file *file) | |
949 | { | |
950 | struct tpm_chip *chip = file->private_data; | |
1da177e4 | 951 | |
8e39c933 | 952 | flush_scheduled_work(); |
1da177e4 | 953 | spin_lock(&driver_lock); |
5e976d55 | 954 | file->private_data = NULL; |
fe3fd483 | 955 | del_singleshot_timer_sync(&chip->user_read_timer); |
1da177e4 | 956 | atomic_set(&chip->data_pending, 0); |
8e39c933 | 957 | chip->num_opens--; |
e659a3fe | 958 | put_device(chip->dev); |
5e976d55 KH |
959 | kfree(chip->data_buffer); |
960 | spin_unlock(&driver_lock); | |
1da177e4 LT |
961 | return 0; |
962 | } | |
1da177e4 LT |
963 | EXPORT_SYMBOL_GPL(tpm_release); |
964 | ||
b888c87b | 965 | ssize_t tpm_write(struct file *file, const char __user *buf, |
3c2f606a | 966 | size_t size, loff_t *off) |
1da177e4 LT |
967 | { |
968 | struct tpm_chip *chip = file->private_data; | |
969 | int in_size = size, out_size; | |
970 | ||
971 | /* cannot perform a write until the read has cleared | |
972 | either via tpm_read or a user_read_timer timeout */ | |
700d8bdc NA |
973 | while (atomic_read(&chip->data_pending) != 0) |
974 | msleep(TPM_TIMEOUT); | |
1da177e4 | 975 | |
d081d470 | 976 | mutex_lock(&chip->buffer_mutex); |
1da177e4 LT |
977 | |
978 | if (in_size > TPM_BUFSIZE) | |
979 | in_size = TPM_BUFSIZE; | |
980 | ||
981 | if (copy_from_user | |
982 | (chip->data_buffer, (void __user *) buf, in_size)) { | |
d081d470 | 983 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
984 | return -EFAULT; |
985 | } | |
986 | ||
987 | /* atomic tpm command send and result receive */ | |
988 | out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE); | |
989 | ||
990 | atomic_set(&chip->data_pending, out_size); | |
d081d470 | 991 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
992 | |
993 | /* Set a timeout by which the reader must come claim the result */ | |
fe3fd483 | 994 | mod_timer(&chip->user_read_timer, jiffies + (60 * HZ)); |
1da177e4 LT |
995 | |
996 | return in_size; | |
997 | } | |
1da177e4 LT |
998 | EXPORT_SYMBOL_GPL(tpm_write); |
999 | ||
3c2f606a KJH |
1000 | ssize_t tpm_read(struct file *file, char __user *buf, |
1001 | size_t size, loff_t *off) | |
1da177e4 LT |
1002 | { |
1003 | struct tpm_chip *chip = file->private_data; | |
5b44bd58 | 1004 | int ret_size; |
1da177e4 | 1005 | |
5b44bd58 | 1006 | del_singleshot_timer_sync(&chip->user_read_timer); |
ba396115 | 1007 | flush_scheduled_work(); |
5b44bd58 KH |
1008 | ret_size = atomic_read(&chip->data_pending); |
1009 | atomic_set(&chip->data_pending, 0); | |
1010 | if (ret_size > 0) { /* relay data */ | |
1011 | if (size < ret_size) | |
1012 | ret_size = size; | |
1da177e4 | 1013 | |
d081d470 | 1014 | mutex_lock(&chip->buffer_mutex); |
f6a2382c | 1015 | if (copy_to_user(buf, chip->data_buffer, ret_size)) |
5b44bd58 | 1016 | ret_size = -EFAULT; |
d081d470 | 1017 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
1018 | } |
1019 | ||
1020 | return ret_size; | |
1021 | } | |
1da177e4 LT |
1022 | EXPORT_SYMBOL_GPL(tpm_read); |
1023 | ||
e659a3fe | 1024 | void tpm_remove_hardware(struct device *dev) |
1da177e4 | 1025 | { |
e659a3fe | 1026 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
1027 | |
1028 | if (chip == NULL) { | |
e659a3fe | 1029 | dev_err(dev, "No device data found\n"); |
1da177e4 LT |
1030 | return; |
1031 | } | |
1032 | ||
1033 | spin_lock(&driver_lock); | |
1034 | ||
1035 | list_del(&chip->list); | |
1036 | ||
1037 | spin_unlock(&driver_lock); | |
1038 | ||
90dda520 | 1039 | misc_deregister(&chip->vendor.miscdev); |
1da177e4 | 1040 | |
90dda520 | 1041 | sysfs_remove_group(&dev->kobj, chip->vendor.attr_group); |
55a82ab3 | 1042 | tpm_bios_log_teardown(chip->bios_dir); |
1da177e4 | 1043 | |
5bd91f18 RM |
1044 | /* write it this way to be explicit (chip->dev == dev) */ |
1045 | put_device(chip->dev); | |
1da177e4 | 1046 | } |
e659a3fe | 1047 | EXPORT_SYMBOL_GPL(tpm_remove_hardware); |
1da177e4 | 1048 | |
1da177e4 LT |
1049 | /* |
1050 | * We are about to suspend. Save the TPM state | |
1051 | * so that it can be restored. | |
1052 | */ | |
ce2c87d4 | 1053 | int tpm_pm_suspend(struct device *dev, pm_message_t pm_state) |
1da177e4 | 1054 | { |
ce2c87d4 | 1055 | struct tpm_chip *chip = dev_get_drvdata(dev); |
2490c681 DS |
1056 | u8 savestate[] = { |
1057 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
1058 | 0, 0, 0, 10, /* blob length (in bytes) */ | |
1059 | 0, 0, 0, 152 /* TPM_ORD_SaveState */ | |
1060 | }; | |
1061 | ||
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 | ||
5bd91f18 RM |
1085 | /* |
1086 | * Once all references to platform device are down to 0, | |
1087 | * release all allocated structures. | |
1088 | * In case vendor provided release function, | |
1089 | * call it too. | |
1090 | */ | |
1091 | static void tpm_dev_release(struct device *dev) | |
1092 | { | |
1093 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
1094 | ||
1095 | if (chip->vendor.release) | |
1096 | chip->vendor.release(dev); | |
1097 | ||
1098 | chip->release(dev); | |
1099 | ||
1100 | clear_bit(chip->dev_num, dev_mask); | |
1101 | kfree(chip->vendor.miscdev.name); | |
1102 | kfree(chip); | |
1103 | } | |
1104 | ||
1da177e4 LT |
1105 | /* |
1106 | * Called from tpm_<specific>.c probe function only for devices | |
1107 | * the driver has determined it should claim. Prior to calling | |
1108 | * this function the specific probe function has called pci_enable_device | |
1109 | * upon errant exit from this function specific probe function should call | |
1110 | * pci_disable_device | |
1111 | */ | |
e0dd03ca KJH |
1112 | struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vendor_specific |
1113 | *entry) | |
1da177e4 | 1114 | { |
6f9beccb KJH |
1115 | #define DEVNAME_SIZE 7 |
1116 | ||
1117 | char *devname; | |
1da177e4 | 1118 | struct tpm_chip *chip; |
1da177e4 LT |
1119 | |
1120 | /* Driver specific per-device data */ | |
b888c87b | 1121 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
8e39c933 PW |
1122 | devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL); |
1123 | ||
1124 | if (chip == NULL || devname == NULL) { | |
1125 | kfree(chip); | |
1126 | kfree(devname); | |
e0dd03ca | 1127 | return NULL; |
8e39c933 | 1128 | } |
1da177e4 | 1129 | |
d081d470 MK |
1130 | mutex_init(&chip->buffer_mutex); |
1131 | mutex_init(&chip->tpm_mutex); | |
1da177e4 LT |
1132 | INIT_LIST_HEAD(&chip->list); |
1133 | ||
c4028958 | 1134 | INIT_WORK(&chip->work, timeout_work); |
09e12f9f | 1135 | |
40565f19 JS |
1136 | setup_timer(&chip->user_read_timer, user_reader_timeout, |
1137 | (unsigned long)chip); | |
fe3fd483 | 1138 | |
90dda520 | 1139 | memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific)); |
1da177e4 | 1140 | |
10685a95 | 1141 | chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES); |
1da177e4 | 1142 | |
10685a95 | 1143 | if (chip->dev_num >= TPM_NUM_DEVICES) { |
b888c87b | 1144 | dev_err(dev, "No available tpm device numbers\n"); |
1da177e4 | 1145 | kfree(chip); |
e0dd03ca | 1146 | return NULL; |
1da177e4 | 1147 | } else if (chip->dev_num == 0) |
90dda520 | 1148 | chip->vendor.miscdev.minor = TPM_MINOR; |
1da177e4 | 1149 | else |
90dda520 | 1150 | chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR; |
1da177e4 | 1151 | |
10685a95 KJH |
1152 | set_bit(chip->dev_num, dev_mask); |
1153 | ||
6f9beccb | 1154 | scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num); |
90dda520 | 1155 | chip->vendor.miscdev.name = devname; |
1da177e4 | 1156 | |
94fbcded | 1157 | chip->vendor.miscdev.parent = dev; |
e659a3fe | 1158 | chip->dev = get_device(dev); |
5bd91f18 RM |
1159 | chip->release = dev->release; |
1160 | dev->release = tpm_dev_release; | |
1161 | dev_set_drvdata(dev, chip); | |
1da177e4 | 1162 | |
90dda520 | 1163 | if (misc_register(&chip->vendor.miscdev)) { |
e659a3fe | 1164 | dev_err(chip->dev, |
1da177e4 | 1165 | "unable to misc_register %s, minor %d\n", |
90dda520 KJH |
1166 | chip->vendor.miscdev.name, |
1167 | chip->vendor.miscdev.minor); | |
5bd91f18 | 1168 | put_device(chip->dev); |
e0dd03ca | 1169 | return NULL; |
1da177e4 LT |
1170 | } |
1171 | ||
5e976d55 KH |
1172 | spin_lock(&driver_lock); |
1173 | ||
1da177e4 LT |
1174 | list_add(&chip->list, &tpm_chip_list); |
1175 | ||
5e976d55 KH |
1176 | spin_unlock(&driver_lock); |
1177 | ||
f33d9bd5 JG |
1178 | if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) { |
1179 | list_del(&chip->list); | |
5d469ec0 | 1180 | misc_deregister(&chip->vendor.miscdev); |
5bd91f18 | 1181 | put_device(chip->dev); |
f33d9bd5 JG |
1182 | return NULL; |
1183 | } | |
1da177e4 | 1184 | |
55a82ab3 KJH |
1185 | chip->bios_dir = tpm_bios_log_setup(devname); |
1186 | ||
e0dd03ca | 1187 | return chip; |
1da177e4 | 1188 | } |
1da177e4 LT |
1189 | EXPORT_SYMBOL_GPL(tpm_register_hardware); |
1190 | ||
1da177e4 LT |
1191 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); |
1192 | MODULE_DESCRIPTION("TPM Driver"); | |
1193 | MODULE_VERSION("2.0"); | |
1194 | MODULE_LICENSE("GPL"); |