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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 | * | |
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 | |
22 | * calls to schedule_timeout. | |
23 | * | |
24 | */ | |
25 | ||
26 | #include <linux/sched.h> | |
27 | #include <linux/poll.h> | |
28 | #include <linux/spinlock.h> | |
29 | #include "tpm.h" | |
30 | ||
31 | #define TPM_MINOR 224 /* officially assigned */ | |
32 | ||
33 | #define TPM_BUFSIZE 2048 | |
34 | ||
35 | /* PCI configuration addresses */ | |
36 | #define PCI_GEN_PMCON_1 0xA0 | |
37 | #define PCI_GEN1_DEC 0xE4 | |
38 | #define PCI_LPC_EN 0xE6 | |
39 | #define PCI_GEN2_DEC 0xEC | |
40 | ||
41 | static LIST_HEAD(tpm_chip_list); | |
42 | static DEFINE_SPINLOCK(driver_lock); | |
43 | static int dev_mask[32]; | |
44 | ||
45 | static void user_reader_timeout(unsigned long ptr) | |
46 | { | |
47 | struct tpm_chip *chip = (struct tpm_chip *) ptr; | |
48 | ||
49 | down(&chip->buffer_mutex); | |
50 | atomic_set(&chip->data_pending, 0); | |
51 | memset(chip->data_buffer, 0, TPM_BUFSIZE); | |
52 | up(&chip->buffer_mutex); | |
53 | } | |
54 | ||
55 | void tpm_time_expired(unsigned long ptr) | |
56 | { | |
57 | int *exp = (int *) ptr; | |
58 | *exp = 1; | |
59 | } | |
60 | ||
61 | EXPORT_SYMBOL_GPL(tpm_time_expired); | |
62 | ||
63 | /* | |
64 | * Initialize the LPC bus and enable the TPM ports | |
65 | */ | |
66 | int tpm_lpc_bus_init(struct pci_dev *pci_dev, u16 base) | |
67 | { | |
68 | u32 lpcenable, tmp; | |
69 | int is_lpcm = 0; | |
70 | ||
71 | switch (pci_dev->vendor) { | |
72 | case PCI_VENDOR_ID_INTEL: | |
73 | switch (pci_dev->device) { | |
74 | case PCI_DEVICE_ID_INTEL_82801CA_12: | |
75 | case PCI_DEVICE_ID_INTEL_82801DB_12: | |
76 | is_lpcm = 1; | |
77 | break; | |
78 | } | |
79 | /* init ICH (enable LPC) */ | |
80 | pci_read_config_dword(pci_dev, PCI_GEN1_DEC, &lpcenable); | |
81 | lpcenable |= 0x20000000; | |
82 | pci_write_config_dword(pci_dev, PCI_GEN1_DEC, lpcenable); | |
83 | ||
84 | if (is_lpcm) { | |
85 | pci_read_config_dword(pci_dev, PCI_GEN1_DEC, | |
86 | &lpcenable); | |
87 | if ((lpcenable & 0x20000000) == 0) { | |
88 | dev_err(&pci_dev->dev, | |
89 | "cannot enable LPC\n"); | |
90 | return -ENODEV; | |
91 | } | |
92 | } | |
93 | ||
94 | /* initialize TPM registers */ | |
95 | pci_read_config_dword(pci_dev, PCI_GEN2_DEC, &tmp); | |
96 | ||
97 | if (!is_lpcm) | |
98 | tmp = (tmp & 0xFFFF0000) | (base & 0xFFF0); | |
99 | else | |
100 | tmp = | |
101 | (tmp & 0xFFFF0000) | (base & 0xFFF0) | | |
102 | 0x00000001; | |
103 | ||
104 | pci_write_config_dword(pci_dev, PCI_GEN2_DEC, tmp); | |
105 | ||
106 | if (is_lpcm) { | |
107 | pci_read_config_dword(pci_dev, PCI_GEN_PMCON_1, | |
108 | &tmp); | |
109 | tmp |= 0x00000004; /* enable CLKRUN */ | |
110 | pci_write_config_dword(pci_dev, PCI_GEN_PMCON_1, | |
111 | tmp); | |
112 | } | |
113 | tpm_write_index(0x0D, 0x55); /* unlock 4F */ | |
114 | tpm_write_index(0x0A, 0x00); /* int disable */ | |
115 | tpm_write_index(0x08, base); /* base addr lo */ | |
116 | tpm_write_index(0x09, (base & 0xFF00) >> 8); /* base addr hi */ | |
117 | tpm_write_index(0x0D, 0xAA); /* lock 4F */ | |
118 | break; | |
119 | case PCI_VENDOR_ID_AMD: | |
120 | /* nothing yet */ | |
121 | break; | |
122 | } | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | EXPORT_SYMBOL_GPL(tpm_lpc_bus_init); | |
128 | ||
129 | /* | |
130 | * Internal kernel interface to transmit TPM commands | |
131 | */ | |
132 | static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf, | |
133 | size_t bufsiz) | |
134 | { | |
135 | ssize_t len; | |
136 | u32 count; | |
137 | __be32 *native_size; | |
138 | ||
139 | native_size = (__force __be32 *) (buf + 2); | |
140 | count = be32_to_cpu(*native_size); | |
141 | ||
142 | if (count == 0) | |
143 | return -ENODATA; | |
144 | if (count > bufsiz) { | |
145 | dev_err(&chip->pci_dev->dev, | |
146 | "invalid count value %x %x \n", count, bufsiz); | |
147 | return -E2BIG; | |
148 | } | |
149 | ||
150 | down(&chip->tpm_mutex); | |
151 | ||
152 | if ((len = chip->vendor->send(chip, (u8 *) buf, count)) < 0) { | |
153 | dev_err(&chip->pci_dev->dev, | |
154 | "tpm_transmit: tpm_send: error %d\n", len); | |
155 | return len; | |
156 | } | |
157 | ||
158 | down(&chip->timer_manipulation_mutex); | |
159 | chip->time_expired = 0; | |
160 | init_timer(&chip->device_timer); | |
161 | chip->device_timer.function = tpm_time_expired; | |
162 | chip->device_timer.expires = jiffies + 2 * 60 * HZ; | |
163 | chip->device_timer.data = (unsigned long) &chip->time_expired; | |
164 | add_timer(&chip->device_timer); | |
165 | up(&chip->timer_manipulation_mutex); | |
166 | ||
167 | do { | |
168 | u8 status = inb(chip->vendor->base + 1); | |
169 | if ((status & chip->vendor->req_complete_mask) == | |
170 | chip->vendor->req_complete_val) { | |
171 | down(&chip->timer_manipulation_mutex); | |
172 | del_singleshot_timer_sync(&chip->device_timer); | |
173 | up(&chip->timer_manipulation_mutex); | |
174 | goto out_recv; | |
175 | } | |
176 | set_current_state(TASK_UNINTERRUPTIBLE); | |
177 | schedule_timeout(TPM_TIMEOUT); | |
178 | rmb(); | |
179 | } while (!chip->time_expired); | |
180 | ||
181 | ||
182 | chip->vendor->cancel(chip); | |
183 | dev_err(&chip->pci_dev->dev, "Time expired\n"); | |
184 | up(&chip->tpm_mutex); | |
185 | return -EIO; | |
186 | ||
187 | out_recv: | |
188 | len = chip->vendor->recv(chip, (u8 *) buf, bufsiz); | |
189 | if (len < 0) | |
190 | dev_err(&chip->pci_dev->dev, | |
191 | "tpm_transmit: tpm_recv: error %d\n", len); | |
192 | up(&chip->tpm_mutex); | |
193 | return len; | |
194 | } | |
195 | ||
196 | #define TPM_DIGEST_SIZE 20 | |
197 | #define CAP_PCR_RESULT_SIZE 18 | |
198 | static u8 cap_pcr[] = { | |
199 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
200 | 0, 0, 0, 22, /* length */ | |
201 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
202 | 0, 0, 0, 5, | |
203 | 0, 0, 0, 4, | |
204 | 0, 0, 1, 1 | |
205 | }; | |
206 | ||
207 | #define READ_PCR_RESULT_SIZE 30 | |
208 | static u8 pcrread[] = { | |
209 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
210 | 0, 0, 0, 14, /* length */ | |
211 | 0, 0, 0, 21, /* TPM_ORD_PcrRead */ | |
212 | 0, 0, 0, 0 /* PCR index */ | |
213 | }; | |
214 | ||
215 | static ssize_t show_pcrs(struct device *dev, char *buf) | |
216 | { | |
217 | u8 data[READ_PCR_RESULT_SIZE]; | |
218 | ssize_t len; | |
219 | int i, j, index, num_pcrs; | |
220 | char *str = buf; | |
221 | ||
222 | struct tpm_chip *chip = | |
223 | pci_get_drvdata(container_of(dev, struct pci_dev, dev)); | |
224 | if (chip == NULL) | |
225 | return -ENODEV; | |
226 | ||
227 | memcpy(data, cap_pcr, sizeof(cap_pcr)); | |
228 | if ((len = tpm_transmit(chip, data, sizeof(data))) | |
229 | < CAP_PCR_RESULT_SIZE) | |
230 | return len; | |
231 | ||
232 | num_pcrs = be32_to_cpu(*((__force __be32 *) (data + 14))); | |
233 | ||
234 | for (i = 0; i < num_pcrs; i++) { | |
235 | memcpy(data, pcrread, sizeof(pcrread)); | |
236 | index = cpu_to_be32(i); | |
237 | memcpy(data + 10, &index, 4); | |
238 | if ((len = tpm_transmit(chip, data, sizeof(data))) | |
239 | < READ_PCR_RESULT_SIZE) | |
240 | return len; | |
241 | str += sprintf(str, "PCR-%02d: ", i); | |
242 | for (j = 0; j < TPM_DIGEST_SIZE; j++) | |
243 | str += sprintf(str, "%02X ", *(data + 10 + j)); | |
244 | str += sprintf(str, "\n"); | |
245 | } | |
246 | return str - buf; | |
247 | } | |
248 | ||
249 | static DEVICE_ATTR(pcrs, S_IRUGO, show_pcrs, NULL); | |
250 | ||
251 | #define READ_PUBEK_RESULT_SIZE 314 | |
252 | static u8 readpubek[] = { | |
253 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
254 | 0, 0, 0, 30, /* length */ | |
255 | 0, 0, 0, 124, /* TPM_ORD_ReadPubek */ | |
256 | }; | |
257 | ||
258 | static ssize_t show_pubek(struct device *dev, char *buf) | |
259 | { | |
260 | u8 data[READ_PUBEK_RESULT_SIZE]; | |
261 | ssize_t len; | |
262 | __be32 *native_val; | |
263 | int i; | |
264 | char *str = buf; | |
265 | ||
266 | struct tpm_chip *chip = | |
267 | pci_get_drvdata(container_of(dev, struct pci_dev, dev)); | |
268 | if (chip == NULL) | |
269 | return -ENODEV; | |
270 | ||
271 | memcpy(data, readpubek, sizeof(readpubek)); | |
272 | memset(data + sizeof(readpubek), 0, 20); /* zero nonce */ | |
273 | ||
274 | if ((len = tpm_transmit(chip, data, sizeof(data))) < | |
275 | READ_PUBEK_RESULT_SIZE) | |
276 | return len; | |
277 | ||
278 | /* | |
279 | ignore header 10 bytes | |
280 | algorithm 32 bits (1 == RSA ) | |
281 | encscheme 16 bits | |
282 | sigscheme 16 bits | |
283 | parameters (RSA 12->bytes: keybit, #primes, expbit) | |
284 | keylenbytes 32 bits | |
285 | 256 byte modulus | |
286 | ignore checksum 20 bytes | |
287 | */ | |
288 | ||
289 | native_val = (__force __be32 *) (data + 34); | |
290 | ||
291 | str += | |
292 | sprintf(str, | |
293 | "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n" | |
294 | "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X" | |
295 | " %02X %02X %02X %02X %02X %02X %02X %02X\n" | |
296 | "Modulus length: %d\nModulus: \n", | |
297 | data[10], data[11], data[12], data[13], data[14], | |
298 | data[15], data[16], data[17], data[22], data[23], | |
299 | data[24], data[25], data[26], data[27], data[28], | |
300 | data[29], data[30], data[31], data[32], data[33], | |
301 | be32_to_cpu(*native_val) | |
302 | ); | |
303 | ||
304 | for (i = 0; i < 256; i++) { | |
305 | str += sprintf(str, "%02X ", data[i + 39]); | |
306 | if ((i + 1) % 16 == 0) | |
307 | str += sprintf(str, "\n"); | |
308 | } | |
309 | return str - buf; | |
310 | } | |
311 | ||
312 | static DEVICE_ATTR(pubek, S_IRUGO, show_pubek, NULL); | |
313 | ||
314 | #define CAP_VER_RESULT_SIZE 18 | |
315 | static u8 cap_version[] = { | |
316 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
317 | 0, 0, 0, 18, /* length */ | |
318 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
319 | 0, 0, 0, 6, | |
320 | 0, 0, 0, 0 | |
321 | }; | |
322 | ||
323 | #define CAP_MANUFACTURER_RESULT_SIZE 18 | |
324 | static u8 cap_manufacturer[] = { | |
325 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
326 | 0, 0, 0, 22, /* length */ | |
327 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
328 | 0, 0, 0, 5, | |
329 | 0, 0, 0, 4, | |
330 | 0, 0, 1, 3 | |
331 | }; | |
332 | ||
333 | static ssize_t show_caps(struct device *dev, char *buf) | |
334 | { | |
335 | u8 data[READ_PUBEK_RESULT_SIZE]; | |
336 | ssize_t len; | |
337 | char *str = buf; | |
338 | ||
339 | struct tpm_chip *chip = | |
340 | pci_get_drvdata(container_of(dev, struct pci_dev, dev)); | |
341 | if (chip == NULL) | |
342 | return -ENODEV; | |
343 | ||
344 | memcpy(data, cap_manufacturer, sizeof(cap_manufacturer)); | |
345 | ||
346 | if ((len = tpm_transmit(chip, data, sizeof(data))) < | |
347 | CAP_MANUFACTURER_RESULT_SIZE) | |
348 | return len; | |
349 | ||
350 | str += sprintf(str, "Manufacturer: 0x%x\n", | |
351 | be32_to_cpu(*(data + 14))); | |
352 | ||
353 | memcpy(data, cap_version, sizeof(cap_version)); | |
354 | ||
355 | if ((len = tpm_transmit(chip, data, sizeof(data))) < | |
356 | CAP_VER_RESULT_SIZE) | |
357 | return len; | |
358 | ||
359 | str += | |
360 | sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
361 | (int) data[14], (int) data[15], (int) data[16], | |
362 | (int) data[17]); | |
363 | ||
364 | return str - buf; | |
365 | } | |
366 | ||
367 | static DEVICE_ATTR(caps, S_IRUGO, show_caps, NULL); | |
368 | ||
369 | /* | |
370 | * Device file system interface to the TPM | |
371 | */ | |
372 | int tpm_open(struct inode *inode, struct file *file) | |
373 | { | |
374 | int rc = 0, minor = iminor(inode); | |
375 | struct tpm_chip *chip = NULL, *pos; | |
376 | ||
377 | spin_lock(&driver_lock); | |
378 | ||
379 | list_for_each_entry(pos, &tpm_chip_list, list) { | |
380 | if (pos->vendor->miscdev.minor == minor) { | |
381 | chip = pos; | |
382 | break; | |
383 | } | |
384 | } | |
385 | ||
386 | if (chip == NULL) { | |
387 | rc = -ENODEV; | |
388 | goto err_out; | |
389 | } | |
390 | ||
391 | if (chip->num_opens) { | |
392 | dev_dbg(&chip->pci_dev->dev, | |
393 | "Another process owns this TPM\n"); | |
394 | rc = -EBUSY; | |
395 | goto err_out; | |
396 | } | |
397 | ||
398 | chip->num_opens++; | |
399 | pci_dev_get(chip->pci_dev); | |
400 | ||
401 | spin_unlock(&driver_lock); | |
402 | ||
403 | chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); | |
404 | if (chip->data_buffer == NULL) { | |
405 | chip->num_opens--; | |
406 | pci_dev_put(chip->pci_dev); | |
407 | return -ENOMEM; | |
408 | } | |
409 | ||
410 | atomic_set(&chip->data_pending, 0); | |
411 | ||
412 | file->private_data = chip; | |
413 | return 0; | |
414 | ||
415 | err_out: | |
416 | spin_unlock(&driver_lock); | |
417 | return rc; | |
418 | } | |
419 | ||
420 | EXPORT_SYMBOL_GPL(tpm_open); | |
421 | ||
422 | int tpm_release(struct inode *inode, struct file *file) | |
423 | { | |
424 | struct tpm_chip *chip = file->private_data; | |
425 | ||
426 | file->private_data = NULL; | |
427 | ||
428 | spin_lock(&driver_lock); | |
429 | chip->num_opens--; | |
430 | spin_unlock(&driver_lock); | |
431 | ||
432 | down(&chip->timer_manipulation_mutex); | |
433 | if (timer_pending(&chip->user_read_timer)) | |
434 | del_singleshot_timer_sync(&chip->user_read_timer); | |
435 | else if (timer_pending(&chip->device_timer)) | |
436 | del_singleshot_timer_sync(&chip->device_timer); | |
437 | up(&chip->timer_manipulation_mutex); | |
438 | ||
439 | kfree(chip->data_buffer); | |
440 | atomic_set(&chip->data_pending, 0); | |
441 | ||
442 | pci_dev_put(chip->pci_dev); | |
443 | return 0; | |
444 | } | |
445 | ||
446 | EXPORT_SYMBOL_GPL(tpm_release); | |
447 | ||
448 | ssize_t tpm_write(struct file * file, const char __user * buf, | |
449 | size_t size, loff_t * off) | |
450 | { | |
451 | struct tpm_chip *chip = file->private_data; | |
452 | int in_size = size, out_size; | |
453 | ||
454 | /* cannot perform a write until the read has cleared | |
455 | either via tpm_read or a user_read_timer timeout */ | |
456 | while (atomic_read(&chip->data_pending) != 0) { | |
457 | set_current_state(TASK_UNINTERRUPTIBLE); | |
458 | schedule_timeout(TPM_TIMEOUT); | |
459 | } | |
460 | ||
461 | down(&chip->buffer_mutex); | |
462 | ||
463 | if (in_size > TPM_BUFSIZE) | |
464 | in_size = TPM_BUFSIZE; | |
465 | ||
466 | if (copy_from_user | |
467 | (chip->data_buffer, (void __user *) buf, in_size)) { | |
468 | up(&chip->buffer_mutex); | |
469 | return -EFAULT; | |
470 | } | |
471 | ||
472 | /* atomic tpm command send and result receive */ | |
473 | out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE); | |
474 | ||
475 | atomic_set(&chip->data_pending, out_size); | |
476 | up(&chip->buffer_mutex); | |
477 | ||
478 | /* Set a timeout by which the reader must come claim the result */ | |
479 | down(&chip->timer_manipulation_mutex); | |
480 | init_timer(&chip->user_read_timer); | |
481 | chip->user_read_timer.function = user_reader_timeout; | |
482 | chip->user_read_timer.data = (unsigned long) chip; | |
483 | chip->user_read_timer.expires = jiffies + (60 * HZ); | |
484 | add_timer(&chip->user_read_timer); | |
485 | up(&chip->timer_manipulation_mutex); | |
486 | ||
487 | return in_size; | |
488 | } | |
489 | ||
490 | EXPORT_SYMBOL_GPL(tpm_write); | |
491 | ||
492 | ssize_t tpm_read(struct file * file, char __user * buf, | |
493 | size_t size, loff_t * off) | |
494 | { | |
495 | struct tpm_chip *chip = file->private_data; | |
496 | int ret_size = -ENODATA; | |
497 | ||
498 | if (atomic_read(&chip->data_pending) != 0) { /* Result available */ | |
499 | down(&chip->timer_manipulation_mutex); | |
500 | del_singleshot_timer_sync(&chip->user_read_timer); | |
501 | up(&chip->timer_manipulation_mutex); | |
502 | ||
503 | down(&chip->buffer_mutex); | |
504 | ||
505 | ret_size = atomic_read(&chip->data_pending); | |
506 | atomic_set(&chip->data_pending, 0); | |
507 | ||
508 | if (ret_size == 0) /* timeout just occurred */ | |
509 | ret_size = -ETIME; | |
510 | else if (ret_size > 0) { /* relay data */ | |
511 | if (size < ret_size) | |
512 | ret_size = size; | |
513 | ||
514 | if (copy_to_user((void __user *) buf, | |
515 | chip->data_buffer, ret_size)) { | |
516 | ret_size = -EFAULT; | |
517 | } | |
518 | } | |
519 | up(&chip->buffer_mutex); | |
520 | } | |
521 | ||
522 | return ret_size; | |
523 | } | |
524 | ||
525 | EXPORT_SYMBOL_GPL(tpm_read); | |
526 | ||
527 | void __devexit tpm_remove(struct pci_dev *pci_dev) | |
528 | { | |
529 | struct tpm_chip *chip = pci_get_drvdata(pci_dev); | |
530 | ||
531 | if (chip == NULL) { | |
532 | dev_err(&pci_dev->dev, "No device data found\n"); | |
533 | return; | |
534 | } | |
535 | ||
536 | spin_lock(&driver_lock); | |
537 | ||
538 | list_del(&chip->list); | |
539 | ||
540 | spin_unlock(&driver_lock); | |
541 | ||
542 | pci_set_drvdata(pci_dev, NULL); | |
543 | misc_deregister(&chip->vendor->miscdev); | |
544 | ||
545 | device_remove_file(&pci_dev->dev, &dev_attr_pubek); | |
546 | device_remove_file(&pci_dev->dev, &dev_attr_pcrs); | |
547 | device_remove_file(&pci_dev->dev, &dev_attr_caps); | |
548 | ||
549 | pci_disable_device(pci_dev); | |
550 | ||
551 | dev_mask[chip->dev_num / 32] &= !(1 << (chip->dev_num % 32)); | |
552 | ||
553 | kfree(chip); | |
554 | ||
555 | pci_dev_put(pci_dev); | |
556 | } | |
557 | ||
558 | EXPORT_SYMBOL_GPL(tpm_remove); | |
559 | ||
560 | static u8 savestate[] = { | |
561 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
562 | 0, 0, 0, 10, /* blob length (in bytes) */ | |
563 | 0, 0, 0, 152 /* TPM_ORD_SaveState */ | |
564 | }; | |
565 | ||
566 | /* | |
567 | * We are about to suspend. Save the TPM state | |
568 | * so that it can be restored. | |
569 | */ | |
570 | int tpm_pm_suspend(struct pci_dev *pci_dev, u32 pm_state) | |
571 | { | |
572 | struct tpm_chip *chip = pci_get_drvdata(pci_dev); | |
573 | if (chip == NULL) | |
574 | return -ENODEV; | |
575 | ||
576 | tpm_transmit(chip, savestate, sizeof(savestate)); | |
577 | return 0; | |
578 | } | |
579 | ||
580 | EXPORT_SYMBOL_GPL(tpm_pm_suspend); | |
581 | ||
582 | /* | |
583 | * Resume from a power safe. The BIOS already restored | |
584 | * the TPM state. | |
585 | */ | |
586 | int tpm_pm_resume(struct pci_dev *pci_dev) | |
587 | { | |
588 | struct tpm_chip *chip = pci_get_drvdata(pci_dev); | |
589 | ||
590 | if (chip == NULL) | |
591 | return -ENODEV; | |
592 | ||
593 | spin_lock(&driver_lock); | |
594 | tpm_lpc_bus_init(pci_dev, chip->vendor->base); | |
595 | spin_unlock(&driver_lock); | |
596 | ||
597 | return 0; | |
598 | } | |
599 | ||
600 | EXPORT_SYMBOL_GPL(tpm_pm_resume); | |
601 | ||
602 | /* | |
603 | * Called from tpm_<specific>.c probe function only for devices | |
604 | * the driver has determined it should claim. Prior to calling | |
605 | * this function the specific probe function has called pci_enable_device | |
606 | * upon errant exit from this function specific probe function should call | |
607 | * pci_disable_device | |
608 | */ | |
609 | int tpm_register_hardware(struct pci_dev *pci_dev, | |
610 | struct tpm_vendor_specific *entry) | |
611 | { | |
612 | char devname[7]; | |
613 | struct tpm_chip *chip; | |
614 | int i, j; | |
615 | ||
616 | /* Driver specific per-device data */ | |
617 | chip = kmalloc(sizeof(*chip), GFP_KERNEL); | |
618 | if (chip == NULL) | |
619 | return -ENOMEM; | |
620 | ||
621 | memset(chip, 0, sizeof(struct tpm_chip)); | |
622 | ||
623 | init_MUTEX(&chip->buffer_mutex); | |
624 | init_MUTEX(&chip->tpm_mutex); | |
625 | init_MUTEX(&chip->timer_manipulation_mutex); | |
626 | INIT_LIST_HEAD(&chip->list); | |
627 | ||
628 | chip->vendor = entry; | |
629 | ||
630 | chip->dev_num = -1; | |
631 | ||
632 | for (i = 0; i < 32; i++) | |
633 | for (j = 0; j < 8; j++) | |
634 | if ((dev_mask[i] & (1 << j)) == 0) { | |
635 | chip->dev_num = i * 32 + j; | |
636 | dev_mask[i] |= 1 << j; | |
637 | goto dev_num_search_complete; | |
638 | } | |
639 | ||
640 | dev_num_search_complete: | |
641 | if (chip->dev_num < 0) { | |
642 | dev_err(&pci_dev->dev, | |
643 | "No available tpm device numbers\n"); | |
644 | kfree(chip); | |
645 | return -ENODEV; | |
646 | } else if (chip->dev_num == 0) | |
647 | chip->vendor->miscdev.minor = TPM_MINOR; | |
648 | else | |
649 | chip->vendor->miscdev.minor = MISC_DYNAMIC_MINOR; | |
650 | ||
651 | snprintf(devname, sizeof(devname), "%s%d", "tpm", chip->dev_num); | |
652 | chip->vendor->miscdev.name = devname; | |
653 | ||
654 | chip->vendor->miscdev.dev = &(pci_dev->dev); | |
655 | chip->pci_dev = pci_dev_get(pci_dev); | |
656 | ||
657 | if (misc_register(&chip->vendor->miscdev)) { | |
658 | dev_err(&chip->pci_dev->dev, | |
659 | "unable to misc_register %s, minor %d\n", | |
660 | chip->vendor->miscdev.name, | |
661 | chip->vendor->miscdev.minor); | |
662 | pci_dev_put(pci_dev); | |
663 | kfree(chip); | |
664 | dev_mask[i] &= !(1 << j); | |
665 | return -ENODEV; | |
666 | } | |
667 | ||
668 | pci_set_drvdata(pci_dev, chip); | |
669 | ||
670 | list_add(&chip->list, &tpm_chip_list); | |
671 | ||
672 | device_create_file(&pci_dev->dev, &dev_attr_pubek); | |
673 | device_create_file(&pci_dev->dev, &dev_attr_pcrs); | |
674 | device_create_file(&pci_dev->dev, &dev_attr_caps); | |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
679 | EXPORT_SYMBOL_GPL(tpm_register_hardware); | |
680 | ||
681 | static int __init init_tpm(void) | |
682 | { | |
683 | return 0; | |
684 | } | |
685 | ||
686 | static void __exit cleanup_tpm(void) | |
687 | { | |
688 | ||
689 | } | |
690 | ||
691 | module_init(init_tpm); | |
692 | module_exit(cleanup_tpm); | |
693 | ||
694 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); | |
695 | MODULE_DESCRIPTION("TPM Driver"); | |
696 | MODULE_VERSION("2.0"); | |
697 | MODULE_LICENSE("GPL"); |