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