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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 | |
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, | |
35 | TPM_NUM_MASK_ENTRIES = TPM_NUM_DEVICES / (8 * sizeof(int)) | |
36 | }; | |
1da177e4 | 37 | |
3122a88a KH |
38 | /* PCI configuration addresses */ |
39 | enum tpm_pci_config_addr { | |
40 | PCI_GEN_PMCON_1 = 0xA0, | |
41 | PCI_GEN1_DEC = 0xE4, | |
42 | PCI_LPC_EN = 0xE6, | |
43 | PCI_GEN2_DEC = 0xEC | |
44 | }; | |
45 | ||
46 | enum tpm_config { | |
47 | TPM_LOCK_REG = 0x0D, | |
48 | TPM_INTERUPT_REG = 0x0A, | |
49 | TPM_BASE_ADDR_LO = 0x08, | |
50 | TPM_BASE_ADDR_HI = 0x09, | |
51 | TPM_UNLOCK_VALUE = 0x55, | |
52 | TPM_LOCK_VALUE = 0xAA, | |
53 | TPM_DISABLE_INTERUPT_VALUE = 0x00 | |
54 | }; | |
1da177e4 | 55 | |
1da177e4 LT |
56 | |
57 | static LIST_HEAD(tpm_chip_list); | |
58 | static DEFINE_SPINLOCK(driver_lock); | |
3122a88a | 59 | static int dev_mask[TPM_NUM_MASK_ENTRIES]; |
1da177e4 LT |
60 | |
61 | static void user_reader_timeout(unsigned long ptr) | |
62 | { | |
63 | struct tpm_chip *chip = (struct tpm_chip *) ptr; | |
64 | ||
65 | down(&chip->buffer_mutex); | |
66 | atomic_set(&chip->data_pending, 0); | |
67 | memset(chip->data_buffer, 0, TPM_BUFSIZE); | |
68 | up(&chip->buffer_mutex); | |
69 | } | |
70 | ||
1da177e4 LT |
71 | /* |
72 | * Initialize the LPC bus and enable the TPM ports | |
73 | */ | |
74 | int tpm_lpc_bus_init(struct pci_dev *pci_dev, u16 base) | |
75 | { | |
76 | u32 lpcenable, tmp; | |
77 | int is_lpcm = 0; | |
78 | ||
79 | switch (pci_dev->vendor) { | |
80 | case PCI_VENDOR_ID_INTEL: | |
81 | switch (pci_dev->device) { | |
82 | case PCI_DEVICE_ID_INTEL_82801CA_12: | |
83 | case PCI_DEVICE_ID_INTEL_82801DB_12: | |
84 | is_lpcm = 1; | |
85 | break; | |
86 | } | |
87 | /* init ICH (enable LPC) */ | |
88 | pci_read_config_dword(pci_dev, PCI_GEN1_DEC, &lpcenable); | |
89 | lpcenable |= 0x20000000; | |
90 | pci_write_config_dword(pci_dev, PCI_GEN1_DEC, lpcenable); | |
91 | ||
92 | if (is_lpcm) { | |
93 | pci_read_config_dword(pci_dev, PCI_GEN1_DEC, | |
94 | &lpcenable); | |
95 | if ((lpcenable & 0x20000000) == 0) { | |
96 | dev_err(&pci_dev->dev, | |
97 | "cannot enable LPC\n"); | |
98 | return -ENODEV; | |
99 | } | |
100 | } | |
101 | ||
102 | /* initialize TPM registers */ | |
103 | pci_read_config_dword(pci_dev, PCI_GEN2_DEC, &tmp); | |
104 | ||
105 | if (!is_lpcm) | |
106 | tmp = (tmp & 0xFFFF0000) | (base & 0xFFF0); | |
107 | else | |
108 | tmp = | |
109 | (tmp & 0xFFFF0000) | (base & 0xFFF0) | | |
110 | 0x00000001; | |
111 | ||
112 | pci_write_config_dword(pci_dev, PCI_GEN2_DEC, tmp); | |
113 | ||
114 | if (is_lpcm) { | |
115 | pci_read_config_dword(pci_dev, PCI_GEN_PMCON_1, | |
116 | &tmp); | |
117 | tmp |= 0x00000004; /* enable CLKRUN */ | |
118 | pci_write_config_dword(pci_dev, PCI_GEN_PMCON_1, | |
119 | tmp); | |
120 | } | |
1da177e4 LT |
121 | break; |
122 | case PCI_VENDOR_ID_AMD: | |
123 | /* nothing yet */ | |
124 | break; | |
125 | } | |
126 | ||
3122a88a KH |
127 | tpm_write_index(TPM_LOCK_REG, TPM_UNLOCK_VALUE); |
128 | tpm_write_index(TPM_INTERUPT_REG, TPM_DISABLE_INTERUPT_VALUE); | |
129 | tpm_write_index(TPM_BASE_ADDR_LO, base); | |
130 | tpm_write_index(TPM_BASE_ADDR_HI, (base & 0xFF00) >> 8); | |
131 | tpm_write_index(TPM_LOCK_REG, TPM_LOCK_VALUE); | |
132 | ||
1da177e4 LT |
133 | return 0; |
134 | } | |
135 | ||
136 | EXPORT_SYMBOL_GPL(tpm_lpc_bus_init); | |
137 | ||
138 | /* | |
139 | * Internal kernel interface to transmit TPM commands | |
140 | */ | |
141 | static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf, | |
142 | size_t bufsiz) | |
143 | { | |
144 | ssize_t len; | |
145 | u32 count; | |
146 | __be32 *native_size; | |
700d8bdc | 147 | unsigned long stop; |
1da177e4 LT |
148 | |
149 | native_size = (__force __be32 *) (buf + 2); | |
150 | count = be32_to_cpu(*native_size); | |
151 | ||
152 | if (count == 0) | |
153 | return -ENODATA; | |
154 | if (count > bufsiz) { | |
155 | dev_err(&chip->pci_dev->dev, | |
b76be681 | 156 | "invalid count value %x %zx \n", count, bufsiz); |
1da177e4 LT |
157 | return -E2BIG; |
158 | } | |
159 | ||
160 | down(&chip->tpm_mutex); | |
161 | ||
162 | if ((len = chip->vendor->send(chip, (u8 *) buf, count)) < 0) { | |
163 | dev_err(&chip->pci_dev->dev, | |
b76be681 | 164 | "tpm_transmit: tpm_send: error %zd\n", len); |
1da177e4 LT |
165 | return len; |
166 | } | |
167 | ||
700d8bdc | 168 | stop = jiffies + 2 * 60 * HZ; |
1da177e4 LT |
169 | do { |
170 | u8 status = inb(chip->vendor->base + 1); | |
171 | if ((status & chip->vendor->req_complete_mask) == | |
172 | chip->vendor->req_complete_val) { | |
1da177e4 LT |
173 | goto out_recv; |
174 | } | |
700d8bdc | 175 | msleep(TPM_TIMEOUT); /* CHECK */ |
1da177e4 | 176 | rmb(); |
700d8bdc | 177 | } while (time_before(jiffies, stop)); |
1da177e4 LT |
178 | |
179 | ||
180 | chip->vendor->cancel(chip); | |
181 | dev_err(&chip->pci_dev->dev, "Time expired\n"); | |
182 | up(&chip->tpm_mutex); | |
183 | return -EIO; | |
184 | ||
185 | out_recv: | |
186 | len = chip->vendor->recv(chip, (u8 *) buf, bufsiz); | |
187 | if (len < 0) | |
188 | dev_err(&chip->pci_dev->dev, | |
b76be681 | 189 | "tpm_transmit: tpm_recv: error %zd\n", len); |
1da177e4 LT |
190 | up(&chip->tpm_mutex); |
191 | return len; | |
192 | } | |
193 | ||
194 | #define TPM_DIGEST_SIZE 20 | |
195 | #define CAP_PCR_RESULT_SIZE 18 | |
dff37e4b | 196 | static const u8 cap_pcr[] = { |
1da177e4 LT |
197 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
198 | 0, 0, 0, 22, /* length */ | |
199 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
200 | 0, 0, 0, 5, | |
201 | 0, 0, 0, 4, | |
202 | 0, 0, 1, 1 | |
203 | }; | |
204 | ||
205 | #define READ_PCR_RESULT_SIZE 30 | |
dff37e4b | 206 | static const u8 pcrread[] = { |
1da177e4 LT |
207 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
208 | 0, 0, 0, 14, /* length */ | |
209 | 0, 0, 0, 21, /* TPM_ORD_PcrRead */ | |
210 | 0, 0, 0, 0 /* PCR index */ | |
211 | }; | |
212 | ||
74880c06 | 213 | static ssize_t show_pcrs(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
214 | { |
215 | u8 data[READ_PCR_RESULT_SIZE]; | |
216 | ssize_t len; | |
217 | int i, j, index, num_pcrs; | |
218 | char *str = buf; | |
219 | ||
220 | struct tpm_chip *chip = | |
e2fe9066 | 221 | pci_get_drvdata(to_pci_dev(dev)); |
1da177e4 LT |
222 | if (chip == NULL) |
223 | return -ENODEV; | |
224 | ||
225 | memcpy(data, cap_pcr, sizeof(cap_pcr)); | |
226 | if ((len = tpm_transmit(chip, data, sizeof(data))) | |
227 | < CAP_PCR_RESULT_SIZE) | |
228 | return len; | |
229 | ||
230 | num_pcrs = be32_to_cpu(*((__force __be32 *) (data + 14))); | |
231 | ||
232 | for (i = 0; i < num_pcrs; i++) { | |
233 | memcpy(data, pcrread, sizeof(pcrread)); | |
234 | index = cpu_to_be32(i); | |
235 | memcpy(data + 10, &index, 4); | |
236 | if ((len = tpm_transmit(chip, data, sizeof(data))) | |
237 | < READ_PCR_RESULT_SIZE) | |
238 | return len; | |
239 | str += sprintf(str, "PCR-%02d: ", i); | |
240 | for (j = 0; j < TPM_DIGEST_SIZE; j++) | |
241 | str += sprintf(str, "%02X ", *(data + 10 + j)); | |
242 | str += sprintf(str, "\n"); | |
243 | } | |
244 | return str - buf; | |
245 | } | |
246 | ||
247 | static DEVICE_ATTR(pcrs, S_IRUGO, show_pcrs, NULL); | |
248 | ||
249 | #define READ_PUBEK_RESULT_SIZE 314 | |
dff37e4b | 250 | static const u8 readpubek[] = { |
1da177e4 LT |
251 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
252 | 0, 0, 0, 30, /* length */ | |
253 | 0, 0, 0, 124, /* TPM_ORD_ReadPubek */ | |
254 | }; | |
255 | ||
74880c06 | 256 | static ssize_t show_pubek(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 257 | { |
2df7111f | 258 | u8 *data; |
1da177e4 LT |
259 | ssize_t len; |
260 | __be32 *native_val; | |
261 | int i; | |
262 | char *str = buf; | |
263 | ||
264 | struct tpm_chip *chip = | |
e2fe9066 | 265 | pci_get_drvdata(to_pci_dev(dev)); |
1da177e4 LT |
266 | if (chip == NULL) |
267 | return -ENODEV; | |
268 | ||
2df7111f KH |
269 | data = kmalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL); |
270 | if (!data) | |
271 | return -ENOMEM; | |
272 | ||
1da177e4 LT |
273 | memcpy(data, readpubek, sizeof(readpubek)); |
274 | memset(data + sizeof(readpubek), 0, 20); /* zero nonce */ | |
275 | ||
2df7111f KH |
276 | if ((len = tpm_transmit(chip, data, READ_PUBEK_RESULT_SIZE)) < |
277 | READ_PUBEK_RESULT_SIZE) { | |
278 | rc = len; | |
279 | goto out; | |
280 | } | |
1da177e4 LT |
281 | |
282 | /* | |
283 | ignore header 10 bytes | |
284 | algorithm 32 bits (1 == RSA ) | |
285 | encscheme 16 bits | |
286 | sigscheme 16 bits | |
287 | parameters (RSA 12->bytes: keybit, #primes, expbit) | |
288 | keylenbytes 32 bits | |
289 | 256 byte modulus | |
290 | ignore checksum 20 bytes | |
291 | */ | |
292 | ||
293 | native_val = (__force __be32 *) (data + 34); | |
294 | ||
295 | str += | |
296 | sprintf(str, | |
297 | "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n" | |
298 | "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X" | |
299 | " %02X %02X %02X %02X %02X %02X %02X %02X\n" | |
300 | "Modulus length: %d\nModulus: \n", | |
301 | data[10], data[11], data[12], data[13], data[14], | |
302 | data[15], data[16], data[17], data[22], data[23], | |
303 | data[24], data[25], data[26], data[27], data[28], | |
304 | data[29], data[30], data[31], data[32], data[33], | |
305 | be32_to_cpu(*native_val) | |
306 | ); | |
307 | ||
308 | for (i = 0; i < 256; i++) { | |
309 | str += sprintf(str, "%02X ", data[i + 39]); | |
310 | if ((i + 1) % 16 == 0) | |
311 | str += sprintf(str, "\n"); | |
312 | } | |
2df7111f KH |
313 | rc = str - buf; |
314 | out: | |
315 | kfree(data); | |
316 | return rc; | |
1da177e4 LT |
317 | } |
318 | ||
319 | static DEVICE_ATTR(pubek, S_IRUGO, show_pubek, NULL); | |
320 | ||
321 | #define CAP_VER_RESULT_SIZE 18 | |
dff37e4b | 322 | static const u8 cap_version[] = { |
1da177e4 LT |
323 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
324 | 0, 0, 0, 18, /* length */ | |
325 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
326 | 0, 0, 0, 6, | |
327 | 0, 0, 0, 0 | |
328 | }; | |
329 | ||
330 | #define CAP_MANUFACTURER_RESULT_SIZE 18 | |
dff37e4b | 331 | static const u8 cap_manufacturer[] = { |
1da177e4 LT |
332 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
333 | 0, 0, 0, 22, /* length */ | |
334 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
335 | 0, 0, 0, 5, | |
336 | 0, 0, 0, 4, | |
337 | 0, 0, 1, 3 | |
338 | }; | |
339 | ||
74880c06 | 340 | static ssize_t show_caps(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 341 | { |
2df7111f | 342 | u8 data[sizeof(cap_manufacturer)]; |
1da177e4 LT |
343 | ssize_t len; |
344 | char *str = buf; | |
345 | ||
346 | struct tpm_chip *chip = | |
e2fe9066 | 347 | pci_get_drvdata(to_pci_dev(dev)); |
1da177e4 LT |
348 | if (chip == NULL) |
349 | return -ENODEV; | |
350 | ||
351 | memcpy(data, cap_manufacturer, sizeof(cap_manufacturer)); | |
352 | ||
353 | if ((len = tpm_transmit(chip, data, sizeof(data))) < | |
354 | CAP_MANUFACTURER_RESULT_SIZE) | |
355 | return len; | |
356 | ||
357 | str += sprintf(str, "Manufacturer: 0x%x\n", | |
358 | be32_to_cpu(*(data + 14))); | |
359 | ||
360 | memcpy(data, cap_version, sizeof(cap_version)); | |
361 | ||
362 | if ((len = tpm_transmit(chip, data, sizeof(data))) < | |
363 | CAP_VER_RESULT_SIZE) | |
364 | return len; | |
365 | ||
366 | str += | |
367 | sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
368 | (int) data[14], (int) data[15], (int) data[16], | |
369 | (int) data[17]); | |
370 | ||
371 | return str - buf; | |
372 | } | |
373 | ||
374 | static DEVICE_ATTR(caps, S_IRUGO, show_caps, NULL); | |
375 | ||
376 | /* | |
377 | * Device file system interface to the TPM | |
378 | */ | |
379 | int tpm_open(struct inode *inode, struct file *file) | |
380 | { | |
381 | int rc = 0, minor = iminor(inode); | |
382 | struct tpm_chip *chip = NULL, *pos; | |
383 | ||
384 | spin_lock(&driver_lock); | |
385 | ||
386 | list_for_each_entry(pos, &tpm_chip_list, list) { | |
387 | if (pos->vendor->miscdev.minor == minor) { | |
388 | chip = pos; | |
389 | break; | |
390 | } | |
391 | } | |
392 | ||
393 | if (chip == NULL) { | |
394 | rc = -ENODEV; | |
395 | goto err_out; | |
396 | } | |
397 | ||
398 | if (chip->num_opens) { | |
399 | dev_dbg(&chip->pci_dev->dev, | |
400 | "Another process owns this TPM\n"); | |
401 | rc = -EBUSY; | |
402 | goto err_out; | |
403 | } | |
404 | ||
405 | chip->num_opens++; | |
406 | pci_dev_get(chip->pci_dev); | |
407 | ||
408 | spin_unlock(&driver_lock); | |
409 | ||
410 | chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); | |
411 | if (chip->data_buffer == NULL) { | |
412 | chip->num_opens--; | |
413 | pci_dev_put(chip->pci_dev); | |
414 | return -ENOMEM; | |
415 | } | |
416 | ||
417 | atomic_set(&chip->data_pending, 0); | |
418 | ||
419 | file->private_data = chip; | |
420 | return 0; | |
421 | ||
422 | err_out: | |
423 | spin_unlock(&driver_lock); | |
424 | return rc; | |
425 | } | |
426 | ||
427 | EXPORT_SYMBOL_GPL(tpm_open); | |
428 | ||
429 | int tpm_release(struct inode *inode, struct file *file) | |
430 | { | |
431 | struct tpm_chip *chip = file->private_data; | |
432 | ||
433 | file->private_data = NULL; | |
434 | ||
435 | spin_lock(&driver_lock); | |
436 | chip->num_opens--; | |
fe3fd483 | 437 | del_singleshot_timer_sync(&chip->user_read_timer); |
1da177e4 LT |
438 | atomic_set(&chip->data_pending, 0); |
439 | ||
440 | pci_dev_put(chip->pci_dev); | |
441 | return 0; | |
442 | } | |
443 | ||
444 | EXPORT_SYMBOL_GPL(tpm_release); | |
445 | ||
446 | ssize_t tpm_write(struct file * file, const char __user * buf, | |
447 | size_t size, loff_t * off) | |
448 | { | |
449 | struct tpm_chip *chip = file->private_data; | |
450 | int in_size = size, out_size; | |
451 | ||
452 | /* cannot perform a write until the read has cleared | |
453 | either via tpm_read or a user_read_timer timeout */ | |
700d8bdc NA |
454 | while (atomic_read(&chip->data_pending) != 0) |
455 | msleep(TPM_TIMEOUT); | |
1da177e4 LT |
456 | |
457 | down(&chip->buffer_mutex); | |
458 | ||
459 | if (in_size > TPM_BUFSIZE) | |
460 | in_size = TPM_BUFSIZE; | |
461 | ||
462 | if (copy_from_user | |
463 | (chip->data_buffer, (void __user *) buf, in_size)) { | |
464 | up(&chip->buffer_mutex); | |
465 | return -EFAULT; | |
466 | } | |
467 | ||
468 | /* atomic tpm command send and result receive */ | |
469 | out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE); | |
470 | ||
471 | atomic_set(&chip->data_pending, out_size); | |
472 | up(&chip->buffer_mutex); | |
473 | ||
474 | /* Set a timeout by which the reader must come claim the result */ | |
fe3fd483 | 475 | mod_timer(&chip->user_read_timer, jiffies + (60 * HZ)); |
1da177e4 LT |
476 | |
477 | return in_size; | |
478 | } | |
479 | ||
480 | EXPORT_SYMBOL_GPL(tpm_write); | |
481 | ||
482 | ssize_t tpm_read(struct file * file, char __user * buf, | |
483 | size_t size, loff_t * off) | |
484 | { | |
485 | struct tpm_chip *chip = file->private_data; | |
5b44bd58 | 486 | int ret_size; |
1da177e4 | 487 | |
5b44bd58 KH |
488 | del_singleshot_timer_sync(&chip->user_read_timer); |
489 | ret_size = atomic_read(&chip->data_pending); | |
490 | atomic_set(&chip->data_pending, 0); | |
491 | if (ret_size > 0) { /* relay data */ | |
492 | if (size < ret_size) | |
493 | ret_size = size; | |
1da177e4 LT |
494 | |
495 | down(&chip->buffer_mutex); | |
5b44bd58 KH |
496 | if (copy_to_user |
497 | ((void __user *) buf, chip->data_buffer, ret_size)) | |
498 | ret_size = -EFAULT; | |
1da177e4 LT |
499 | up(&chip->buffer_mutex); |
500 | } | |
501 | ||
502 | return ret_size; | |
503 | } | |
504 | ||
505 | EXPORT_SYMBOL_GPL(tpm_read); | |
506 | ||
507 | void __devexit tpm_remove(struct pci_dev *pci_dev) | |
508 | { | |
509 | struct tpm_chip *chip = pci_get_drvdata(pci_dev); | |
510 | ||
511 | if (chip == NULL) { | |
512 | dev_err(&pci_dev->dev, "No device data found\n"); | |
513 | return; | |
514 | } | |
515 | ||
516 | spin_lock(&driver_lock); | |
517 | ||
518 | list_del(&chip->list); | |
519 | ||
520 | spin_unlock(&driver_lock); | |
521 | ||
522 | pci_set_drvdata(pci_dev, NULL); | |
523 | misc_deregister(&chip->vendor->miscdev); | |
524 | ||
525 | device_remove_file(&pci_dev->dev, &dev_attr_pubek); | |
526 | device_remove_file(&pci_dev->dev, &dev_attr_pcrs); | |
527 | device_remove_file(&pci_dev->dev, &dev_attr_caps); | |
528 | ||
529 | pci_disable_device(pci_dev); | |
530 | ||
3122a88a | 531 | dev_mask[chip->dev_num / TPM_NUM_MASK_ENTRIES ] &= !(1 << (chip->dev_num % TPM_NUM_MASK_ENTRIES)); |
1da177e4 LT |
532 | |
533 | kfree(chip); | |
534 | ||
535 | pci_dev_put(pci_dev); | |
536 | } | |
537 | ||
538 | EXPORT_SYMBOL_GPL(tpm_remove); | |
539 | ||
540 | static u8 savestate[] = { | |
541 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
542 | 0, 0, 0, 10, /* blob length (in bytes) */ | |
543 | 0, 0, 0, 152 /* TPM_ORD_SaveState */ | |
544 | }; | |
545 | ||
546 | /* | |
547 | * We are about to suspend. Save the TPM state | |
548 | * so that it can be restored. | |
549 | */ | |
4fd416c1 | 550 | int tpm_pm_suspend(struct pci_dev *pci_dev, pm_message_t pm_state) |
1da177e4 LT |
551 | { |
552 | struct tpm_chip *chip = pci_get_drvdata(pci_dev); | |
553 | if (chip == NULL) | |
554 | return -ENODEV; | |
555 | ||
556 | tpm_transmit(chip, savestate, sizeof(savestate)); | |
557 | return 0; | |
558 | } | |
559 | ||
560 | EXPORT_SYMBOL_GPL(tpm_pm_suspend); | |
561 | ||
562 | /* | |
563 | * Resume from a power safe. The BIOS already restored | |
564 | * the TPM state. | |
565 | */ | |
566 | int tpm_pm_resume(struct pci_dev *pci_dev) | |
567 | { | |
568 | struct tpm_chip *chip = pci_get_drvdata(pci_dev); | |
569 | ||
570 | if (chip == NULL) | |
571 | return -ENODEV; | |
572 | ||
573 | spin_lock(&driver_lock); | |
574 | tpm_lpc_bus_init(pci_dev, chip->vendor->base); | |
575 | spin_unlock(&driver_lock); | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
580 | EXPORT_SYMBOL_GPL(tpm_pm_resume); | |
581 | ||
582 | /* | |
583 | * Called from tpm_<specific>.c probe function only for devices | |
584 | * the driver has determined it should claim. Prior to calling | |
585 | * this function the specific probe function has called pci_enable_device | |
586 | * upon errant exit from this function specific probe function should call | |
587 | * pci_disable_device | |
588 | */ | |
589 | int tpm_register_hardware(struct pci_dev *pci_dev, | |
590 | struct tpm_vendor_specific *entry) | |
591 | { | |
592 | char devname[7]; | |
593 | struct tpm_chip *chip; | |
594 | int i, j; | |
595 | ||
596 | /* Driver specific per-device data */ | |
597 | chip = kmalloc(sizeof(*chip), GFP_KERNEL); | |
598 | if (chip == NULL) | |
599 | return -ENOMEM; | |
600 | ||
601 | memset(chip, 0, sizeof(struct tpm_chip)); | |
602 | ||
603 | init_MUTEX(&chip->buffer_mutex); | |
604 | init_MUTEX(&chip->tpm_mutex); | |
1da177e4 LT |
605 | INIT_LIST_HEAD(&chip->list); |
606 | ||
fe3fd483 KH |
607 | init_timer(&chip->user_read_timer); |
608 | chip->user_read_timer.function = user_reader_timeout; | |
609 | chip->user_read_timer.data = (unsigned long) chip; | |
610 | ||
1da177e4 LT |
611 | chip->vendor = entry; |
612 | ||
613 | chip->dev_num = -1; | |
614 | ||
3122a88a KH |
615 | for (i = 0; i < TPM_NUM_MASK_ENTRIES; i++) |
616 | for (j = 0; j < 8 * sizeof(int); j++) | |
1da177e4 | 617 | if ((dev_mask[i] & (1 << j)) == 0) { |
3122a88a KH |
618 | chip->dev_num = |
619 | i * TPM_NUM_MASK_ENTRIES + j; | |
1da177e4 LT |
620 | dev_mask[i] |= 1 << j; |
621 | goto dev_num_search_complete; | |
622 | } | |
623 | ||
624 | dev_num_search_complete: | |
625 | if (chip->dev_num < 0) { | |
626 | dev_err(&pci_dev->dev, | |
627 | "No available tpm device numbers\n"); | |
628 | kfree(chip); | |
629 | return -ENODEV; | |
630 | } else if (chip->dev_num == 0) | |
631 | chip->vendor->miscdev.minor = TPM_MINOR; | |
632 | else | |
633 | chip->vendor->miscdev.minor = MISC_DYNAMIC_MINOR; | |
634 | ||
635 | snprintf(devname, sizeof(devname), "%s%d", "tpm", chip->dev_num); | |
636 | chip->vendor->miscdev.name = devname; | |
637 | ||
638 | chip->vendor->miscdev.dev = &(pci_dev->dev); | |
639 | chip->pci_dev = pci_dev_get(pci_dev); | |
640 | ||
641 | if (misc_register(&chip->vendor->miscdev)) { | |
642 | dev_err(&chip->pci_dev->dev, | |
643 | "unable to misc_register %s, minor %d\n", | |
644 | chip->vendor->miscdev.name, | |
645 | chip->vendor->miscdev.minor); | |
646 | pci_dev_put(pci_dev); | |
647 | kfree(chip); | |
648 | dev_mask[i] &= !(1 << j); | |
649 | return -ENODEV; | |
650 | } | |
651 | ||
652 | pci_set_drvdata(pci_dev, chip); | |
653 | ||
654 | list_add(&chip->list, &tpm_chip_list); | |
655 | ||
656 | device_create_file(&pci_dev->dev, &dev_attr_pubek); | |
657 | device_create_file(&pci_dev->dev, &dev_attr_pcrs); | |
658 | device_create_file(&pci_dev->dev, &dev_attr_caps); | |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
663 | EXPORT_SYMBOL_GPL(tpm_register_hardware); | |
664 | ||
1da177e4 LT |
665 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); |
666 | MODULE_DESCRIPTION("TPM Driver"); | |
667 | MODULE_VERSION("2.0"); | |
668 | MODULE_LICENSE("GPL"); |