Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2004 IBM Corporation | |
3 | * | |
4 | * Authors: | |
5 | * Leendert van Doorn <leendert@watson.ibm.com> | |
6 | * Dave Safford <safford@watson.ibm.com> | |
7 | * Reiner Sailer <sailer@watson.ibm.com> | |
8 | * Kylene Hall <kjhall@us.ibm.com> | |
9 | * | |
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 | |
1da177e4 LT |
38 | static LIST_HEAD(tpm_chip_list); |
39 | static DEFINE_SPINLOCK(driver_lock); | |
3122a88a | 40 | static int dev_mask[TPM_NUM_MASK_ENTRIES]; |
1da177e4 LT |
41 | |
42 | static void user_reader_timeout(unsigned long ptr) | |
43 | { | |
44 | struct tpm_chip *chip = (struct tpm_chip *) ptr; | |
45 | ||
09e12f9f KJH |
46 | schedule_work(&chip->work); |
47 | } | |
48 | ||
3c2f606a | 49 | static void timeout_work(void *ptr) |
09e12f9f KJH |
50 | { |
51 | struct tpm_chip *chip = ptr; | |
52 | ||
1da177e4 LT |
53 | down(&chip->buffer_mutex); |
54 | atomic_set(&chip->data_pending, 0); | |
55 | memset(chip->data_buffer, 0, TPM_BUFSIZE); | |
56 | up(&chip->buffer_mutex); | |
57 | } | |
58 | ||
1da177e4 LT |
59 | /* |
60 | * Internal kernel interface to transmit TPM commands | |
61 | */ | |
62 | static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf, | |
63 | size_t bufsiz) | |
64 | { | |
d9e5b6bf | 65 | ssize_t rc; |
1da177e4 | 66 | u32 count; |
700d8bdc | 67 | unsigned long stop; |
1da177e4 | 68 | |
81179bb6 | 69 | count = be32_to_cpu(*((__be32 *) (buf + 2))); |
1da177e4 LT |
70 | |
71 | if (count == 0) | |
72 | return -ENODATA; | |
73 | if (count > bufsiz) { | |
e659a3fe | 74 | dev_err(chip->dev, |
b76be681 | 75 | "invalid count value %x %zx \n", count, bufsiz); |
1da177e4 LT |
76 | return -E2BIG; |
77 | } | |
78 | ||
79 | down(&chip->tpm_mutex); | |
80 | ||
90dda520 | 81 | if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) { |
e659a3fe | 82 | dev_err(chip->dev, |
d9e5b6bf KH |
83 | "tpm_transmit: tpm_send: error %zd\n", rc); |
84 | goto out; | |
1da177e4 LT |
85 | } |
86 | ||
700d8bdc | 87 | stop = jiffies + 2 * 60 * HZ; |
1da177e4 | 88 | do { |
90dda520 KJH |
89 | u8 status = chip->vendor.status(chip); |
90 | if ((status & chip->vendor.req_complete_mask) == | |
91 | chip->vendor.req_complete_val) | |
1da177e4 | 92 | goto out_recv; |
d9e5b6bf | 93 | |
90dda520 | 94 | if ((status == chip->vendor.req_canceled)) { |
e659a3fe | 95 | dev_err(chip->dev, "Operation Canceled\n"); |
d9e5b6bf KH |
96 | rc = -ECANCELED; |
97 | goto out; | |
98 | } | |
99 | ||
100 | msleep(TPM_TIMEOUT); /* CHECK */ | |
1da177e4 | 101 | rmb(); |
700d8bdc | 102 | } while (time_before(jiffies, stop)); |
1da177e4 | 103 | |
90dda520 | 104 | chip->vendor.cancel(chip); |
e659a3fe | 105 | dev_err(chip->dev, "Operation Timed out\n"); |
d9e5b6bf KH |
106 | rc = -ETIME; |
107 | goto out; | |
1da177e4 LT |
108 | |
109 | out_recv: | |
90dda520 | 110 | rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz); |
d9e5b6bf | 111 | if (rc < 0) |
e659a3fe | 112 | dev_err(chip->dev, |
d9e5b6bf KH |
113 | "tpm_transmit: tpm_recv: error %zd\n", rc); |
114 | out: | |
1da177e4 | 115 | up(&chip->tpm_mutex); |
d9e5b6bf | 116 | return rc; |
1da177e4 LT |
117 | } |
118 | ||
119 | #define TPM_DIGEST_SIZE 20 | |
beed53a1 KJH |
120 | #define TPM_ERROR_SIZE 10 |
121 | #define TPM_RET_CODE_IDX 6 | |
122 | #define TPM_GET_CAP_RET_SIZE_IDX 10 | |
123 | #define TPM_GET_CAP_RET_UINT32_1_IDX 14 | |
124 | #define TPM_GET_CAP_RET_UINT32_2_IDX 18 | |
125 | #define TPM_GET_CAP_RET_UINT32_3_IDX 22 | |
126 | #define TPM_GET_CAP_RET_UINT32_4_IDX 26 | |
127 | ||
128 | #define TPM_CAP_IDX 13 | |
129 | #define TPM_CAP_SUBCAP_IDX 21 | |
130 | ||
131 | enum tpm_capabilities { | |
132 | TPM_CAP_PROP = 5, | |
133 | }; | |
134 | ||
135 | enum tpm_sub_capabilities { | |
136 | TPM_CAP_PROP_PCR = 0x1, | |
137 | TPM_CAP_PROP_MANUFACTURER = 0x3, | |
138 | }; | |
139 | ||
140 | /* | |
141 | * This is a semi generic GetCapability command for use | |
142 | * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG | |
143 | * and their associated sub_capabilities. | |
144 | */ | |
145 | ||
146 | static const u8 tpm_cap[] = { | |
1da177e4 LT |
147 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
148 | 0, 0, 0, 22, /* length */ | |
149 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
beed53a1 KJH |
150 | 0, 0, 0, 0, /* TPM_CAP_<TYPE> */ |
151 | 0, 0, 0, 4, /* TPM_CAP_SUB_<TYPE> size */ | |
152 | 0, 0, 1, 0 /* TPM_CAP_SUB_<TYPE> */ | |
1da177e4 LT |
153 | }; |
154 | ||
beed53a1 KJH |
155 | static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len, |
156 | char *desc) | |
157 | { | |
158 | int err; | |
159 | ||
160 | len = tpm_transmit(chip, data, len); | |
161 | if (len < 0) | |
162 | return len; | |
163 | if (len == TPM_ERROR_SIZE) { | |
164 | err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))); | |
165 | dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc); | |
166 | return err; | |
167 | } | |
168 | return 0; | |
169 | } | |
170 | ||
dff37e4b | 171 | static const u8 pcrread[] = { |
1da177e4 LT |
172 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
173 | 0, 0, 0, 14, /* length */ | |
174 | 0, 0, 0, 21, /* TPM_ORD_PcrRead */ | |
175 | 0, 0, 0, 0 /* PCR index */ | |
176 | }; | |
177 | ||
6659ca2a KH |
178 | ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr, |
179 | char *buf) | |
1da177e4 | 180 | { |
beed53a1 KJH |
181 | u8 data[30]; |
182 | ssize_t rc; | |
81179bb6 KH |
183 | int i, j, num_pcrs; |
184 | __be32 index; | |
1da177e4 LT |
185 | char *str = buf; |
186 | ||
e659a3fe | 187 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
188 | if (chip == NULL) |
189 | return -ENODEV; | |
190 | ||
beed53a1 KJH |
191 | memcpy(data, tpm_cap, sizeof(tpm_cap)); |
192 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
193 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR; | |
194 | ||
195 | rc = transmit_cmd(chip, data, sizeof(data), | |
196 | "attempting to determine the number of PCRS"); | |
197 | if (rc) | |
e234bc97 | 198 | return 0; |
1da177e4 | 199 | |
81179bb6 | 200 | num_pcrs = be32_to_cpu(*((__be32 *) (data + 14))); |
1da177e4 LT |
201 | for (i = 0; i < num_pcrs; i++) { |
202 | memcpy(data, pcrread, sizeof(pcrread)); | |
203 | index = cpu_to_be32(i); | |
204 | memcpy(data + 10, &index, 4); | |
beed53a1 KJH |
205 | rc = transmit_cmd(chip, data, sizeof(data), |
206 | "attempting to read a PCR"); | |
207 | if (rc) | |
e234bc97 | 208 | goto out; |
1da177e4 LT |
209 | str += sprintf(str, "PCR-%02d: ", i); |
210 | for (j = 0; j < TPM_DIGEST_SIZE; j++) | |
211 | str += sprintf(str, "%02X ", *(data + 10 + j)); | |
212 | str += sprintf(str, "\n"); | |
213 | } | |
e234bc97 | 214 | out: |
1da177e4 LT |
215 | return str - buf; |
216 | } | |
6659ca2a | 217 | EXPORT_SYMBOL_GPL(tpm_show_pcrs); |
1da177e4 LT |
218 | |
219 | #define READ_PUBEK_RESULT_SIZE 314 | |
dff37e4b | 220 | static const u8 readpubek[] = { |
1da177e4 LT |
221 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
222 | 0, 0, 0, 30, /* length */ | |
223 | 0, 0, 0, 124, /* TPM_ORD_ReadPubek */ | |
224 | }; | |
225 | ||
6659ca2a KH |
226 | ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr, |
227 | char *buf) | |
1da177e4 | 228 | { |
2df7111f | 229 | u8 *data; |
beed53a1 | 230 | ssize_t err; |
81179bb6 | 231 | int i, rc; |
1da177e4 LT |
232 | char *str = buf; |
233 | ||
e659a3fe | 234 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
235 | if (chip == NULL) |
236 | return -ENODEV; | |
237 | ||
b888c87b | 238 | data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL); |
2df7111f KH |
239 | if (!data) |
240 | return -ENOMEM; | |
241 | ||
1da177e4 | 242 | memcpy(data, readpubek, sizeof(readpubek)); |
1da177e4 | 243 | |
beed53a1 KJH |
244 | err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE, |
245 | "attempting to read the PUBEK"); | |
246 | if (err) | |
34d6e075 | 247 | goto out; |
1da177e4 LT |
248 | |
249 | /* | |
250 | ignore header 10 bytes | |
251 | algorithm 32 bits (1 == RSA ) | |
252 | encscheme 16 bits | |
253 | sigscheme 16 bits | |
254 | parameters (RSA 12->bytes: keybit, #primes, expbit) | |
255 | keylenbytes 32 bits | |
256 | 256 byte modulus | |
257 | ignore checksum 20 bytes | |
258 | */ | |
259 | ||
1da177e4 LT |
260 | str += |
261 | sprintf(str, | |
262 | "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n" | |
263 | "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X" | |
264 | " %02X %02X %02X %02X %02X %02X %02X %02X\n" | |
265 | "Modulus length: %d\nModulus: \n", | |
266 | data[10], data[11], data[12], data[13], data[14], | |
267 | data[15], data[16], data[17], data[22], data[23], | |
268 | data[24], data[25], data[26], data[27], data[28], | |
269 | data[29], data[30], data[31], data[32], data[33], | |
1dda8abe | 270 | be32_to_cpu(*((__be32 *) (data + 34)))); |
1da177e4 LT |
271 | |
272 | for (i = 0; i < 256; i++) { | |
1dda8abe | 273 | str += sprintf(str, "%02X ", data[i + 38]); |
1da177e4 LT |
274 | if ((i + 1) % 16 == 0) |
275 | str += sprintf(str, "\n"); | |
276 | } | |
34d6e075 | 277 | out: |
beed53a1 | 278 | rc = str - buf; |
2df7111f KH |
279 | kfree(data); |
280 | return rc; | |
1da177e4 | 281 | } |
6659ca2a | 282 | EXPORT_SYMBOL_GPL(tpm_show_pubek); |
1da177e4 | 283 | |
beed53a1 KJH |
284 | #define CAP_VERSION_1_1 6 |
285 | #define CAP_VERSION_IDX 13 | |
dff37e4b | 286 | static const u8 cap_version[] = { |
1da177e4 LT |
287 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
288 | 0, 0, 0, 18, /* length */ | |
289 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
beed53a1 | 290 | 0, 0, 0, 0, |
1da177e4 LT |
291 | 0, 0, 0, 0 |
292 | }; | |
293 | ||
6659ca2a KH |
294 | ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr, |
295 | char *buf) | |
1da177e4 | 296 | { |
beed53a1 KJH |
297 | u8 data[30]; |
298 | ssize_t rc; | |
1da177e4 LT |
299 | char *str = buf; |
300 | ||
e659a3fe | 301 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
302 | if (chip == NULL) |
303 | return -ENODEV; | |
304 | ||
beed53a1 KJH |
305 | memcpy(data, tpm_cap, sizeof(tpm_cap)); |
306 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
307 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER; | |
1da177e4 | 308 | |
beed53a1 KJH |
309 | rc = transmit_cmd(chip, data, sizeof(data), |
310 | "attempting to determine the manufacturer"); | |
311 | if (rc) | |
312 | return 0; | |
1da177e4 LT |
313 | |
314 | str += sprintf(str, "Manufacturer: 0x%x\n", | |
beed53a1 | 315 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)))); |
1da177e4 LT |
316 | |
317 | memcpy(data, cap_version, sizeof(cap_version)); | |
beed53a1 KJH |
318 | data[CAP_VERSION_IDX] = CAP_VERSION_1_1; |
319 | rc = transmit_cmd(chip, data, sizeof(data), | |
320 | "attempting to determine the 1.1 version"); | |
321 | if (rc) | |
322 | goto out; | |
1da177e4 | 323 | |
beed53a1 KJH |
324 | str += sprintf(str, |
325 | "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
326 | (int) data[14], (int) data[15], (int) data[16], | |
327 | (int) data[17]); | |
1da177e4 | 328 | |
beed53a1 | 329 | out: |
1da177e4 LT |
330 | return str - buf; |
331 | } | |
6659ca2a KH |
332 | EXPORT_SYMBOL_GPL(tpm_show_caps); |
333 | ||
334 | ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr, | |
335 | const char *buf, size_t count) | |
336 | { | |
337 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
338 | if (chip == NULL) | |
339 | return 0; | |
340 | ||
90dda520 | 341 | chip->vendor.cancel(chip); |
6659ca2a KH |
342 | return count; |
343 | } | |
344 | EXPORT_SYMBOL_GPL(tpm_store_cancel); | |
1da177e4 | 345 | |
1da177e4 LT |
346 | /* |
347 | * Device file system interface to the TPM | |
348 | */ | |
349 | int tpm_open(struct inode *inode, struct file *file) | |
350 | { | |
351 | int rc = 0, minor = iminor(inode); | |
352 | struct tpm_chip *chip = NULL, *pos; | |
353 | ||
354 | spin_lock(&driver_lock); | |
355 | ||
356 | list_for_each_entry(pos, &tpm_chip_list, list) { | |
90dda520 | 357 | if (pos->vendor.miscdev.minor == minor) { |
1da177e4 LT |
358 | chip = pos; |
359 | break; | |
360 | } | |
361 | } | |
362 | ||
363 | if (chip == NULL) { | |
364 | rc = -ENODEV; | |
365 | goto err_out; | |
366 | } | |
367 | ||
368 | if (chip->num_opens) { | |
b888c87b | 369 | dev_dbg(chip->dev, "Another process owns this TPM\n"); |
1da177e4 LT |
370 | rc = -EBUSY; |
371 | goto err_out; | |
372 | } | |
373 | ||
374 | chip->num_opens++; | |
e659a3fe | 375 | get_device(chip->dev); |
1da177e4 LT |
376 | |
377 | spin_unlock(&driver_lock); | |
378 | ||
379 | chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); | |
380 | if (chip->data_buffer == NULL) { | |
381 | chip->num_opens--; | |
e659a3fe | 382 | put_device(chip->dev); |
1da177e4 LT |
383 | return -ENOMEM; |
384 | } | |
385 | ||
386 | atomic_set(&chip->data_pending, 0); | |
387 | ||
388 | file->private_data = chip; | |
389 | return 0; | |
390 | ||
391 | err_out: | |
392 | spin_unlock(&driver_lock); | |
393 | return rc; | |
394 | } | |
1da177e4 LT |
395 | EXPORT_SYMBOL_GPL(tpm_open); |
396 | ||
397 | int tpm_release(struct inode *inode, struct file *file) | |
398 | { | |
399 | struct tpm_chip *chip = file->private_data; | |
1da177e4 LT |
400 | |
401 | spin_lock(&driver_lock); | |
5e976d55 | 402 | file->private_data = NULL; |
1da177e4 | 403 | chip->num_opens--; |
fe3fd483 | 404 | del_singleshot_timer_sync(&chip->user_read_timer); |
ba396115 | 405 | flush_scheduled_work(); |
1da177e4 | 406 | atomic_set(&chip->data_pending, 0); |
e659a3fe | 407 | put_device(chip->dev); |
5e976d55 KH |
408 | kfree(chip->data_buffer); |
409 | spin_unlock(&driver_lock); | |
1da177e4 LT |
410 | return 0; |
411 | } | |
1da177e4 LT |
412 | EXPORT_SYMBOL_GPL(tpm_release); |
413 | ||
b888c87b | 414 | ssize_t tpm_write(struct file *file, const char __user *buf, |
3c2f606a | 415 | size_t size, loff_t *off) |
1da177e4 LT |
416 | { |
417 | struct tpm_chip *chip = file->private_data; | |
418 | int in_size = size, out_size; | |
419 | ||
420 | /* cannot perform a write until the read has cleared | |
421 | either via tpm_read or a user_read_timer timeout */ | |
700d8bdc NA |
422 | while (atomic_read(&chip->data_pending) != 0) |
423 | msleep(TPM_TIMEOUT); | |
1da177e4 LT |
424 | |
425 | down(&chip->buffer_mutex); | |
426 | ||
427 | if (in_size > TPM_BUFSIZE) | |
428 | in_size = TPM_BUFSIZE; | |
429 | ||
430 | if (copy_from_user | |
431 | (chip->data_buffer, (void __user *) buf, in_size)) { | |
432 | up(&chip->buffer_mutex); | |
433 | return -EFAULT; | |
434 | } | |
435 | ||
436 | /* atomic tpm command send and result receive */ | |
437 | out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE); | |
438 | ||
439 | atomic_set(&chip->data_pending, out_size); | |
440 | up(&chip->buffer_mutex); | |
441 | ||
442 | /* Set a timeout by which the reader must come claim the result */ | |
fe3fd483 | 443 | mod_timer(&chip->user_read_timer, jiffies + (60 * HZ)); |
1da177e4 LT |
444 | |
445 | return in_size; | |
446 | } | |
1da177e4 LT |
447 | EXPORT_SYMBOL_GPL(tpm_write); |
448 | ||
3c2f606a KJH |
449 | ssize_t tpm_read(struct file *file, char __user *buf, |
450 | size_t size, loff_t *off) | |
1da177e4 LT |
451 | { |
452 | struct tpm_chip *chip = file->private_data; | |
5b44bd58 | 453 | int ret_size; |
1da177e4 | 454 | |
5b44bd58 | 455 | del_singleshot_timer_sync(&chip->user_read_timer); |
ba396115 | 456 | flush_scheduled_work(); |
5b44bd58 KH |
457 | ret_size = atomic_read(&chip->data_pending); |
458 | atomic_set(&chip->data_pending, 0); | |
459 | if (ret_size > 0) { /* relay data */ | |
460 | if (size < ret_size) | |
461 | ret_size = size; | |
1da177e4 LT |
462 | |
463 | down(&chip->buffer_mutex); | |
f6a2382c | 464 | if (copy_to_user(buf, chip->data_buffer, ret_size)) |
5b44bd58 | 465 | ret_size = -EFAULT; |
1da177e4 LT |
466 | up(&chip->buffer_mutex); |
467 | } | |
468 | ||
469 | return ret_size; | |
470 | } | |
1da177e4 LT |
471 | EXPORT_SYMBOL_GPL(tpm_read); |
472 | ||
e659a3fe | 473 | void tpm_remove_hardware(struct device *dev) |
1da177e4 | 474 | { |
e659a3fe | 475 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
476 | |
477 | if (chip == NULL) { | |
e659a3fe | 478 | dev_err(dev, "No device data found\n"); |
1da177e4 LT |
479 | return; |
480 | } | |
481 | ||
482 | spin_lock(&driver_lock); | |
483 | ||
484 | list_del(&chip->list); | |
485 | ||
486 | spin_unlock(&driver_lock); | |
487 | ||
e659a3fe | 488 | dev_set_drvdata(dev, NULL); |
90dda520 KJH |
489 | misc_deregister(&chip->vendor.miscdev); |
490 | kfree(chip->vendor.miscdev.name); | |
1da177e4 | 491 | |
90dda520 | 492 | sysfs_remove_group(&dev->kobj, chip->vendor.attr_group); |
55a82ab3 | 493 | tpm_bios_log_teardown(chip->bios_dir); |
1da177e4 | 494 | |
90dda520 KJH |
495 | dev_mask[chip->dev_num / TPM_NUM_MASK_ENTRIES] &= |
496 | ~(1 << (chip->dev_num % TPM_NUM_MASK_ENTRIES)); | |
1da177e4 LT |
497 | |
498 | kfree(chip); | |
499 | ||
e659a3fe | 500 | put_device(dev); |
1da177e4 | 501 | } |
e659a3fe | 502 | EXPORT_SYMBOL_GPL(tpm_remove_hardware); |
1da177e4 LT |
503 | |
504 | static u8 savestate[] = { | |
505 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
506 | 0, 0, 0, 10, /* blob length (in bytes) */ | |
507 | 0, 0, 0, 152 /* TPM_ORD_SaveState */ | |
508 | }; | |
509 | ||
510 | /* | |
511 | * We are about to suspend. Save the TPM state | |
512 | * so that it can be restored. | |
513 | */ | |
ce2c87d4 | 514 | int tpm_pm_suspend(struct device *dev, pm_message_t pm_state) |
1da177e4 | 515 | { |
ce2c87d4 | 516 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
517 | if (chip == NULL) |
518 | return -ENODEV; | |
519 | ||
520 | tpm_transmit(chip, savestate, sizeof(savestate)); | |
521 | return 0; | |
522 | } | |
1da177e4 LT |
523 | EXPORT_SYMBOL_GPL(tpm_pm_suspend); |
524 | ||
525 | /* | |
526 | * Resume from a power safe. The BIOS already restored | |
527 | * the TPM state. | |
528 | */ | |
ce2c87d4 | 529 | int tpm_pm_resume(struct device *dev) |
1da177e4 | 530 | { |
ce2c87d4 | 531 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
532 | |
533 | if (chip == NULL) | |
534 | return -ENODEV; | |
535 | ||
1da177e4 LT |
536 | return 0; |
537 | } | |
1da177e4 LT |
538 | EXPORT_SYMBOL_GPL(tpm_pm_resume); |
539 | ||
540 | /* | |
541 | * Called from tpm_<specific>.c probe function only for devices | |
542 | * the driver has determined it should claim. Prior to calling | |
543 | * this function the specific probe function has called pci_enable_device | |
544 | * upon errant exit from this function specific probe function should call | |
545 | * pci_disable_device | |
546 | */ | |
b888c87b | 547 | int tpm_register_hardware(struct device *dev, struct tpm_vendor_specific *entry) |
1da177e4 | 548 | { |
6f9beccb KJH |
549 | #define DEVNAME_SIZE 7 |
550 | ||
551 | char *devname; | |
1da177e4 LT |
552 | struct tpm_chip *chip; |
553 | int i, j; | |
554 | ||
555 | /* Driver specific per-device data */ | |
b888c87b | 556 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
1da177e4 LT |
557 | if (chip == NULL) |
558 | return -ENOMEM; | |
559 | ||
1da177e4 LT |
560 | init_MUTEX(&chip->buffer_mutex); |
561 | init_MUTEX(&chip->tpm_mutex); | |
1da177e4 LT |
562 | INIT_LIST_HEAD(&chip->list); |
563 | ||
09e12f9f KJH |
564 | INIT_WORK(&chip->work, timeout_work, chip); |
565 | ||
fe3fd483 KH |
566 | init_timer(&chip->user_read_timer); |
567 | chip->user_read_timer.function = user_reader_timeout; | |
568 | chip->user_read_timer.data = (unsigned long) chip; | |
569 | ||
90dda520 | 570 | memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific)); |
1da177e4 LT |
571 | |
572 | chip->dev_num = -1; | |
573 | ||
3122a88a KH |
574 | for (i = 0; i < TPM_NUM_MASK_ENTRIES; i++) |
575 | for (j = 0; j < 8 * sizeof(int); j++) | |
1da177e4 | 576 | if ((dev_mask[i] & (1 << j)) == 0) { |
3122a88a KH |
577 | chip->dev_num = |
578 | i * TPM_NUM_MASK_ENTRIES + j; | |
1da177e4 LT |
579 | dev_mask[i] |= 1 << j; |
580 | goto dev_num_search_complete; | |
581 | } | |
582 | ||
583 | dev_num_search_complete: | |
584 | if (chip->dev_num < 0) { | |
b888c87b | 585 | dev_err(dev, "No available tpm device numbers\n"); |
1da177e4 LT |
586 | kfree(chip); |
587 | return -ENODEV; | |
588 | } else if (chip->dev_num == 0) | |
90dda520 | 589 | chip->vendor.miscdev.minor = TPM_MINOR; |
1da177e4 | 590 | else |
90dda520 | 591 | chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR; |
1da177e4 | 592 | |
6f9beccb KJH |
593 | devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL); |
594 | scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num); | |
90dda520 | 595 | chip->vendor.miscdev.name = devname; |
1da177e4 | 596 | |
90dda520 | 597 | chip->vendor.miscdev.dev = dev; |
e659a3fe | 598 | chip->dev = get_device(dev); |
1da177e4 | 599 | |
90dda520 | 600 | if (misc_register(&chip->vendor.miscdev)) { |
e659a3fe | 601 | dev_err(chip->dev, |
1da177e4 | 602 | "unable to misc_register %s, minor %d\n", |
90dda520 KJH |
603 | chip->vendor.miscdev.name, |
604 | chip->vendor.miscdev.minor); | |
e659a3fe | 605 | put_device(dev); |
1da177e4 LT |
606 | kfree(chip); |
607 | dev_mask[i] &= !(1 << j); | |
608 | return -ENODEV; | |
609 | } | |
610 | ||
5e976d55 KH |
611 | spin_lock(&driver_lock); |
612 | ||
e659a3fe | 613 | dev_set_drvdata(dev, chip); |
1da177e4 LT |
614 | |
615 | list_add(&chip->list, &tpm_chip_list); | |
616 | ||
5e976d55 KH |
617 | spin_unlock(&driver_lock); |
618 | ||
90dda520 | 619 | sysfs_create_group(&dev->kobj, chip->vendor.attr_group); |
1da177e4 | 620 | |
55a82ab3 KJH |
621 | chip->bios_dir = tpm_bios_log_setup(devname); |
622 | ||
1da177e4 LT |
623 | return 0; |
624 | } | |
1da177e4 LT |
625 | EXPORT_SYMBOL_GPL(tpm_register_hardware); |
626 | ||
1da177e4 LT |
627 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); |
628 | MODULE_DESCRIPTION("TPM Driver"); | |
629 | MODULE_VERSION("2.0"); | |
630 | MODULE_LICENSE("GPL"); |