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, | |
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; | |
700d8bdc | 146 | unsigned long stop; |
1da177e4 | 147 | |
81179bb6 | 148 | count = be32_to_cpu(*((__be32 *) (buf + 2))); |
1da177e4 LT |
149 | |
150 | if (count == 0) | |
151 | return -ENODATA; | |
152 | if (count > bufsiz) { | |
153 | dev_err(&chip->pci_dev->dev, | |
b76be681 | 154 | "invalid count value %x %zx \n", count, bufsiz); |
1da177e4 LT |
155 | return -E2BIG; |
156 | } | |
157 | ||
158 | down(&chip->tpm_mutex); | |
159 | ||
160 | if ((len = chip->vendor->send(chip, (u8 *) buf, count)) < 0) { | |
161 | dev_err(&chip->pci_dev->dev, | |
b76be681 | 162 | "tpm_transmit: tpm_send: error %zd\n", len); |
1da177e4 LT |
163 | return len; |
164 | } | |
165 | ||
700d8bdc | 166 | stop = jiffies + 2 * 60 * HZ; |
1da177e4 LT |
167 | do { |
168 | u8 status = inb(chip->vendor->base + 1); | |
169 | if ((status & chip->vendor->req_complete_mask) == | |
170 | chip->vendor->req_complete_val) { | |
1da177e4 LT |
171 | goto out_recv; |
172 | } | |
700d8bdc | 173 | msleep(TPM_TIMEOUT); /* CHECK */ |
1da177e4 | 174 | rmb(); |
700d8bdc | 175 | } while (time_before(jiffies, stop)); |
1da177e4 LT |
176 | |
177 | ||
178 | chip->vendor->cancel(chip); | |
179 | dev_err(&chip->pci_dev->dev, "Time expired\n"); | |
180 | up(&chip->tpm_mutex); | |
181 | return -EIO; | |
182 | ||
183 | out_recv: | |
184 | len = chip->vendor->recv(chip, (u8 *) buf, bufsiz); | |
185 | if (len < 0) | |
186 | dev_err(&chip->pci_dev->dev, | |
b76be681 | 187 | "tpm_transmit: tpm_recv: error %zd\n", len); |
1da177e4 LT |
188 | up(&chip->tpm_mutex); |
189 | return len; | |
190 | } | |
191 | ||
192 | #define TPM_DIGEST_SIZE 20 | |
193 | #define CAP_PCR_RESULT_SIZE 18 | |
dff37e4b | 194 | static const u8 cap_pcr[] = { |
1da177e4 LT |
195 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
196 | 0, 0, 0, 22, /* length */ | |
197 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
198 | 0, 0, 0, 5, | |
199 | 0, 0, 0, 4, | |
200 | 0, 0, 1, 1 | |
201 | }; | |
202 | ||
203 | #define READ_PCR_RESULT_SIZE 30 | |
dff37e4b | 204 | static const u8 pcrread[] = { |
1da177e4 LT |
205 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
206 | 0, 0, 0, 14, /* length */ | |
207 | 0, 0, 0, 21, /* TPM_ORD_PcrRead */ | |
208 | 0, 0, 0, 0 /* PCR index */ | |
209 | }; | |
210 | ||
74880c06 | 211 | static ssize_t show_pcrs(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
212 | { |
213 | u8 data[READ_PCR_RESULT_SIZE]; | |
214 | ssize_t len; | |
81179bb6 KH |
215 | int i, j, num_pcrs; |
216 | __be32 index; | |
1da177e4 LT |
217 | char *str = buf; |
218 | ||
219 | struct tpm_chip *chip = | |
e2fe9066 | 220 | pci_get_drvdata(to_pci_dev(dev)); |
1da177e4 LT |
221 | if (chip == NULL) |
222 | return -ENODEV; | |
223 | ||
224 | memcpy(data, cap_pcr, sizeof(cap_pcr)); | |
225 | if ((len = tpm_transmit(chip, data, sizeof(data))) | |
226 | < CAP_PCR_RESULT_SIZE) | |
227 | return len; | |
228 | ||
81179bb6 | 229 | num_pcrs = be32_to_cpu(*((__be32 *) (data + 14))); |
1da177e4 LT |
230 | |
231 | for (i = 0; i < num_pcrs; i++) { | |
232 | memcpy(data, pcrread, sizeof(pcrread)); | |
233 | index = cpu_to_be32(i); | |
234 | memcpy(data + 10, &index, 4); | |
235 | if ((len = tpm_transmit(chip, data, sizeof(data))) | |
236 | < READ_PCR_RESULT_SIZE) | |
237 | return len; | |
238 | str += sprintf(str, "PCR-%02d: ", i); | |
239 | for (j = 0; j < TPM_DIGEST_SIZE; j++) | |
240 | str += sprintf(str, "%02X ", *(data + 10 + j)); | |
241 | str += sprintf(str, "\n"); | |
242 | } | |
243 | return str - buf; | |
244 | } | |
245 | ||
246 | static DEVICE_ATTR(pcrs, S_IRUGO, show_pcrs, NULL); | |
247 | ||
248 | #define READ_PUBEK_RESULT_SIZE 314 | |
dff37e4b | 249 | static const u8 readpubek[] = { |
1da177e4 LT |
250 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
251 | 0, 0, 0, 30, /* length */ | |
252 | 0, 0, 0, 124, /* TPM_ORD_ReadPubek */ | |
253 | }; | |
254 | ||
74880c06 | 255 | static ssize_t show_pubek(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 256 | { |
2df7111f | 257 | u8 *data; |
1da177e4 | 258 | ssize_t len; |
81179bb6 | 259 | int i, rc; |
1da177e4 LT |
260 | char *str = buf; |
261 | ||
262 | struct tpm_chip *chip = | |
e2fe9066 | 263 | pci_get_drvdata(to_pci_dev(dev)); |
1da177e4 LT |
264 | if (chip == NULL) |
265 | return -ENODEV; | |
266 | ||
2df7111f KH |
267 | data = kmalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL); |
268 | if (!data) | |
269 | return -ENOMEM; | |
270 | ||
1da177e4 LT |
271 | memcpy(data, readpubek, sizeof(readpubek)); |
272 | memset(data + sizeof(readpubek), 0, 20); /* zero nonce */ | |
273 | ||
2df7111f KH |
274 | if ((len = tpm_transmit(chip, data, READ_PUBEK_RESULT_SIZE)) < |
275 | READ_PUBEK_RESULT_SIZE) { | |
276 | rc = len; | |
277 | goto out; | |
278 | } | |
1da177e4 LT |
279 | |
280 | /* | |
281 | ignore header 10 bytes | |
282 | algorithm 32 bits (1 == RSA ) | |
283 | encscheme 16 bits | |
284 | sigscheme 16 bits | |
285 | parameters (RSA 12->bytes: keybit, #primes, expbit) | |
286 | keylenbytes 32 bits | |
287 | 256 byte modulus | |
288 | ignore checksum 20 bytes | |
289 | */ | |
290 | ||
1da177e4 LT |
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], | |
81179bb6 | 301 | be32_to_cpu(*((__be32 *) (data + 32)))); |
1da177e4 LT |
302 | |
303 | for (i = 0; i < 256; i++) { | |
304 | str += sprintf(str, "%02X ", data[i + 39]); | |
305 | if ((i + 1) % 16 == 0) | |
306 | str += sprintf(str, "\n"); | |
307 | } | |
2df7111f KH |
308 | rc = str - buf; |
309 | out: | |
310 | kfree(data); | |
311 | return rc; | |
1da177e4 LT |
312 | } |
313 | ||
314 | static DEVICE_ATTR(pubek, S_IRUGO, show_pubek, NULL); | |
315 | ||
316 | #define CAP_VER_RESULT_SIZE 18 | |
dff37e4b | 317 | static const u8 cap_version[] = { |
1da177e4 LT |
318 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
319 | 0, 0, 0, 18, /* length */ | |
320 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
321 | 0, 0, 0, 6, | |
322 | 0, 0, 0, 0 | |
323 | }; | |
324 | ||
325 | #define CAP_MANUFACTURER_RESULT_SIZE 18 | |
dff37e4b | 326 | static const u8 cap_manufacturer[] = { |
1da177e4 LT |
327 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
328 | 0, 0, 0, 22, /* length */ | |
329 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
330 | 0, 0, 0, 5, | |
331 | 0, 0, 0, 4, | |
332 | 0, 0, 1, 3 | |
333 | }; | |
334 | ||
74880c06 | 335 | static ssize_t show_caps(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 336 | { |
2df7111f | 337 | u8 data[sizeof(cap_manufacturer)]; |
1da177e4 LT |
338 | ssize_t len; |
339 | char *str = buf; | |
340 | ||
341 | struct tpm_chip *chip = | |
e2fe9066 | 342 | pci_get_drvdata(to_pci_dev(dev)); |
1da177e4 LT |
343 | if (chip == NULL) |
344 | return -ENODEV; | |
345 | ||
346 | memcpy(data, cap_manufacturer, sizeof(cap_manufacturer)); | |
347 | ||
348 | if ((len = tpm_transmit(chip, data, sizeof(data))) < | |
349 | CAP_MANUFACTURER_RESULT_SIZE) | |
350 | return len; | |
351 | ||
352 | str += sprintf(str, "Manufacturer: 0x%x\n", | |
81179bb6 | 353 | be32_to_cpu(*((__be32 *) (data + 14)))); |
1da177e4 LT |
354 | |
355 | memcpy(data, cap_version, sizeof(cap_version)); | |
356 | ||
357 | if ((len = tpm_transmit(chip, data, sizeof(data))) < | |
358 | CAP_VER_RESULT_SIZE) | |
359 | return len; | |
360 | ||
361 | str += | |
362 | sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
363 | (int) data[14], (int) data[15], (int) data[16], | |
364 | (int) data[17]); | |
365 | ||
366 | return str - buf; | |
367 | } | |
368 | ||
369 | static DEVICE_ATTR(caps, S_IRUGO, show_caps, NULL); | |
370 | ||
371 | /* | |
372 | * Device file system interface to the TPM | |
373 | */ | |
374 | int tpm_open(struct inode *inode, struct file *file) | |
375 | { | |
376 | int rc = 0, minor = iminor(inode); | |
377 | struct tpm_chip *chip = NULL, *pos; | |
378 | ||
379 | spin_lock(&driver_lock); | |
380 | ||
381 | list_for_each_entry(pos, &tpm_chip_list, list) { | |
382 | if (pos->vendor->miscdev.minor == minor) { | |
383 | chip = pos; | |
384 | break; | |
385 | } | |
386 | } | |
387 | ||
388 | if (chip == NULL) { | |
389 | rc = -ENODEV; | |
390 | goto err_out; | |
391 | } | |
392 | ||
393 | if (chip->num_opens) { | |
394 | dev_dbg(&chip->pci_dev->dev, | |
395 | "Another process owns this TPM\n"); | |
396 | rc = -EBUSY; | |
397 | goto err_out; | |
398 | } | |
399 | ||
400 | chip->num_opens++; | |
401 | pci_dev_get(chip->pci_dev); | |
402 | ||
403 | spin_unlock(&driver_lock); | |
404 | ||
405 | chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); | |
406 | if (chip->data_buffer == NULL) { | |
407 | chip->num_opens--; | |
408 | pci_dev_put(chip->pci_dev); | |
409 | return -ENOMEM; | |
410 | } | |
411 | ||
412 | atomic_set(&chip->data_pending, 0); | |
413 | ||
414 | file->private_data = chip; | |
415 | return 0; | |
416 | ||
417 | err_out: | |
418 | spin_unlock(&driver_lock); | |
419 | return rc; | |
420 | } | |
421 | ||
422 | EXPORT_SYMBOL_GPL(tpm_open); | |
423 | ||
424 | int tpm_release(struct inode *inode, struct file *file) | |
425 | { | |
426 | struct tpm_chip *chip = file->private_data; | |
427 | ||
428 | file->private_data = NULL; | |
429 | ||
430 | spin_lock(&driver_lock); | |
431 | chip->num_opens--; | |
fe3fd483 | 432 | del_singleshot_timer_sync(&chip->user_read_timer); |
1da177e4 LT |
433 | atomic_set(&chip->data_pending, 0); |
434 | ||
435 | pci_dev_put(chip->pci_dev); | |
436 | return 0; | |
437 | } | |
438 | ||
439 | EXPORT_SYMBOL_GPL(tpm_release); | |
440 | ||
441 | ssize_t tpm_write(struct file * file, const char __user * buf, | |
442 | size_t size, loff_t * off) | |
443 | { | |
444 | struct tpm_chip *chip = file->private_data; | |
445 | int in_size = size, out_size; | |
446 | ||
447 | /* cannot perform a write until the read has cleared | |
448 | either via tpm_read or a user_read_timer timeout */ | |
700d8bdc NA |
449 | while (atomic_read(&chip->data_pending) != 0) |
450 | msleep(TPM_TIMEOUT); | |
1da177e4 LT |
451 | |
452 | down(&chip->buffer_mutex); | |
453 | ||
454 | if (in_size > TPM_BUFSIZE) | |
455 | in_size = TPM_BUFSIZE; | |
456 | ||
457 | if (copy_from_user | |
458 | (chip->data_buffer, (void __user *) buf, in_size)) { | |
459 | up(&chip->buffer_mutex); | |
460 | return -EFAULT; | |
461 | } | |
462 | ||
463 | /* atomic tpm command send and result receive */ | |
464 | out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE); | |
465 | ||
466 | atomic_set(&chip->data_pending, out_size); | |
467 | up(&chip->buffer_mutex); | |
468 | ||
469 | /* Set a timeout by which the reader must come claim the result */ | |
fe3fd483 | 470 | mod_timer(&chip->user_read_timer, jiffies + (60 * HZ)); |
1da177e4 LT |
471 | |
472 | return in_size; | |
473 | } | |
474 | ||
475 | EXPORT_SYMBOL_GPL(tpm_write); | |
476 | ||
477 | ssize_t tpm_read(struct file * file, char __user * buf, | |
478 | size_t size, loff_t * off) | |
479 | { | |
480 | struct tpm_chip *chip = file->private_data; | |
5b44bd58 | 481 | int ret_size; |
1da177e4 | 482 | |
5b44bd58 KH |
483 | del_singleshot_timer_sync(&chip->user_read_timer); |
484 | ret_size = atomic_read(&chip->data_pending); | |
485 | atomic_set(&chip->data_pending, 0); | |
486 | if (ret_size > 0) { /* relay data */ | |
487 | if (size < ret_size) | |
488 | ret_size = size; | |
1da177e4 LT |
489 | |
490 | down(&chip->buffer_mutex); | |
5b44bd58 KH |
491 | if (copy_to_user |
492 | ((void __user *) buf, chip->data_buffer, ret_size)) | |
493 | ret_size = -EFAULT; | |
1da177e4 LT |
494 | up(&chip->buffer_mutex); |
495 | } | |
496 | ||
497 | return ret_size; | |
498 | } | |
499 | ||
500 | EXPORT_SYMBOL_GPL(tpm_read); | |
501 | ||
502 | void __devexit tpm_remove(struct pci_dev *pci_dev) | |
503 | { | |
504 | struct tpm_chip *chip = pci_get_drvdata(pci_dev); | |
505 | ||
506 | if (chip == NULL) { | |
507 | dev_err(&pci_dev->dev, "No device data found\n"); | |
508 | return; | |
509 | } | |
510 | ||
511 | spin_lock(&driver_lock); | |
512 | ||
513 | list_del(&chip->list); | |
514 | ||
515 | spin_unlock(&driver_lock); | |
516 | ||
517 | pci_set_drvdata(pci_dev, NULL); | |
518 | misc_deregister(&chip->vendor->miscdev); | |
519 | ||
520 | device_remove_file(&pci_dev->dev, &dev_attr_pubek); | |
521 | device_remove_file(&pci_dev->dev, &dev_attr_pcrs); | |
522 | device_remove_file(&pci_dev->dev, &dev_attr_caps); | |
523 | ||
524 | pci_disable_device(pci_dev); | |
525 | ||
3122a88a | 526 | dev_mask[chip->dev_num / TPM_NUM_MASK_ENTRIES ] &= !(1 << (chip->dev_num % TPM_NUM_MASK_ENTRIES)); |
1da177e4 LT |
527 | |
528 | kfree(chip); | |
529 | ||
530 | pci_dev_put(pci_dev); | |
531 | } | |
532 | ||
533 | EXPORT_SYMBOL_GPL(tpm_remove); | |
534 | ||
535 | static u8 savestate[] = { | |
536 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
537 | 0, 0, 0, 10, /* blob length (in bytes) */ | |
538 | 0, 0, 0, 152 /* TPM_ORD_SaveState */ | |
539 | }; | |
540 | ||
541 | /* | |
542 | * We are about to suspend. Save the TPM state | |
543 | * so that it can be restored. | |
544 | */ | |
4fd416c1 | 545 | int tpm_pm_suspend(struct pci_dev *pci_dev, pm_message_t pm_state) |
1da177e4 LT |
546 | { |
547 | struct tpm_chip *chip = pci_get_drvdata(pci_dev); | |
548 | if (chip == NULL) | |
549 | return -ENODEV; | |
550 | ||
551 | tpm_transmit(chip, savestate, sizeof(savestate)); | |
552 | return 0; | |
553 | } | |
554 | ||
555 | EXPORT_SYMBOL_GPL(tpm_pm_suspend); | |
556 | ||
557 | /* | |
558 | * Resume from a power safe. The BIOS already restored | |
559 | * the TPM state. | |
560 | */ | |
561 | int tpm_pm_resume(struct pci_dev *pci_dev) | |
562 | { | |
563 | struct tpm_chip *chip = pci_get_drvdata(pci_dev); | |
564 | ||
565 | if (chip == NULL) | |
566 | return -ENODEV; | |
567 | ||
568 | spin_lock(&driver_lock); | |
569 | tpm_lpc_bus_init(pci_dev, chip->vendor->base); | |
570 | spin_unlock(&driver_lock); | |
571 | ||
572 | return 0; | |
573 | } | |
574 | ||
575 | EXPORT_SYMBOL_GPL(tpm_pm_resume); | |
576 | ||
577 | /* | |
578 | * Called from tpm_<specific>.c probe function only for devices | |
579 | * the driver has determined it should claim. Prior to calling | |
580 | * this function the specific probe function has called pci_enable_device | |
581 | * upon errant exit from this function specific probe function should call | |
582 | * pci_disable_device | |
583 | */ | |
584 | int tpm_register_hardware(struct pci_dev *pci_dev, | |
585 | struct tpm_vendor_specific *entry) | |
586 | { | |
587 | char devname[7]; | |
588 | struct tpm_chip *chip; | |
589 | int i, j; | |
590 | ||
591 | /* Driver specific per-device data */ | |
592 | chip = kmalloc(sizeof(*chip), GFP_KERNEL); | |
593 | if (chip == NULL) | |
594 | return -ENOMEM; | |
595 | ||
596 | memset(chip, 0, sizeof(struct tpm_chip)); | |
597 | ||
598 | init_MUTEX(&chip->buffer_mutex); | |
599 | init_MUTEX(&chip->tpm_mutex); | |
1da177e4 LT |
600 | INIT_LIST_HEAD(&chip->list); |
601 | ||
fe3fd483 KH |
602 | init_timer(&chip->user_read_timer); |
603 | chip->user_read_timer.function = user_reader_timeout; | |
604 | chip->user_read_timer.data = (unsigned long) chip; | |
605 | ||
1da177e4 LT |
606 | chip->vendor = entry; |
607 | ||
608 | chip->dev_num = -1; | |
609 | ||
3122a88a KH |
610 | for (i = 0; i < TPM_NUM_MASK_ENTRIES; i++) |
611 | for (j = 0; j < 8 * sizeof(int); j++) | |
1da177e4 | 612 | if ((dev_mask[i] & (1 << j)) == 0) { |
3122a88a KH |
613 | chip->dev_num = |
614 | i * TPM_NUM_MASK_ENTRIES + j; | |
1da177e4 LT |
615 | dev_mask[i] |= 1 << j; |
616 | goto dev_num_search_complete; | |
617 | } | |
618 | ||
619 | dev_num_search_complete: | |
620 | if (chip->dev_num < 0) { | |
621 | dev_err(&pci_dev->dev, | |
622 | "No available tpm device numbers\n"); | |
623 | kfree(chip); | |
624 | return -ENODEV; | |
625 | } else if (chip->dev_num == 0) | |
626 | chip->vendor->miscdev.minor = TPM_MINOR; | |
627 | else | |
628 | chip->vendor->miscdev.minor = MISC_DYNAMIC_MINOR; | |
629 | ||
630 | snprintf(devname, sizeof(devname), "%s%d", "tpm", chip->dev_num); | |
631 | chip->vendor->miscdev.name = devname; | |
632 | ||
633 | chip->vendor->miscdev.dev = &(pci_dev->dev); | |
634 | chip->pci_dev = pci_dev_get(pci_dev); | |
635 | ||
636 | if (misc_register(&chip->vendor->miscdev)) { | |
637 | dev_err(&chip->pci_dev->dev, | |
638 | "unable to misc_register %s, minor %d\n", | |
639 | chip->vendor->miscdev.name, | |
640 | chip->vendor->miscdev.minor); | |
641 | pci_dev_put(pci_dev); | |
642 | kfree(chip); | |
643 | dev_mask[i] &= !(1 << j); | |
644 | return -ENODEV; | |
645 | } | |
646 | ||
647 | pci_set_drvdata(pci_dev, chip); | |
648 | ||
649 | list_add(&chip->list, &tpm_chip_list); | |
650 | ||
651 | device_create_file(&pci_dev->dev, &dev_attr_pubek); | |
652 | device_create_file(&pci_dev->dev, &dev_attr_pcrs); | |
653 | device_create_file(&pci_dev->dev, &dev_attr_caps); | |
654 | ||
655 | return 0; | |
656 | } | |
657 | ||
658 | EXPORT_SYMBOL_GPL(tpm_register_hardware); | |
659 | ||
1da177e4 LT |
660 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); |
661 | MODULE_DESCRIPTION("TPM Driver"); | |
662 | MODULE_VERSION("2.0"); | |
663 | MODULE_LICENSE("GPL"); |