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 | ||
d9e5b6bf | 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 { |
b4ed3e3c | 89 | u8 status = chip->vendor->status(chip); |
1da177e4 LT |
90 | if ((status & chip->vendor->req_complete_mask) == |
91 | chip->vendor->req_complete_val) { | |
1da177e4 LT |
92 | goto out_recv; |
93 | } | |
d9e5b6bf KH |
94 | |
95 | if ((status == chip->vendor->req_canceled)) { | |
e659a3fe | 96 | dev_err(chip->dev, "Operation Canceled\n"); |
d9e5b6bf KH |
97 | rc = -ECANCELED; |
98 | goto out; | |
99 | } | |
100 | ||
101 | msleep(TPM_TIMEOUT); /* CHECK */ | |
1da177e4 | 102 | rmb(); |
700d8bdc | 103 | } while (time_before(jiffies, stop)); |
1da177e4 LT |
104 | |
105 | ||
106 | chip->vendor->cancel(chip); | |
e659a3fe | 107 | dev_err(chip->dev, "Operation Timed out\n"); |
d9e5b6bf KH |
108 | rc = -ETIME; |
109 | goto out; | |
1da177e4 LT |
110 | |
111 | out_recv: | |
d9e5b6bf KH |
112 | rc = chip->vendor->recv(chip, (u8 *) buf, bufsiz); |
113 | if (rc < 0) | |
e659a3fe | 114 | dev_err(chip->dev, |
d9e5b6bf KH |
115 | "tpm_transmit: tpm_recv: error %zd\n", rc); |
116 | out: | |
1da177e4 | 117 | up(&chip->tpm_mutex); |
d9e5b6bf | 118 | return rc; |
1da177e4 LT |
119 | } |
120 | ||
121 | #define TPM_DIGEST_SIZE 20 | |
beed53a1 KJH |
122 | #define TPM_ERROR_SIZE 10 |
123 | #define TPM_RET_CODE_IDX 6 | |
124 | #define TPM_GET_CAP_RET_SIZE_IDX 10 | |
125 | #define TPM_GET_CAP_RET_UINT32_1_IDX 14 | |
126 | #define TPM_GET_CAP_RET_UINT32_2_IDX 18 | |
127 | #define TPM_GET_CAP_RET_UINT32_3_IDX 22 | |
128 | #define TPM_GET_CAP_RET_UINT32_4_IDX 26 | |
129 | ||
130 | #define TPM_CAP_IDX 13 | |
131 | #define TPM_CAP_SUBCAP_IDX 21 | |
132 | ||
133 | enum tpm_capabilities { | |
134 | TPM_CAP_PROP = 5, | |
135 | }; | |
136 | ||
137 | enum tpm_sub_capabilities { | |
138 | TPM_CAP_PROP_PCR = 0x1, | |
139 | TPM_CAP_PROP_MANUFACTURER = 0x3, | |
140 | }; | |
141 | ||
142 | /* | |
143 | * This is a semi generic GetCapability command for use | |
144 | * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG | |
145 | * and their associated sub_capabilities. | |
146 | */ | |
147 | ||
148 | static const u8 tpm_cap[] = { | |
1da177e4 LT |
149 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
150 | 0, 0, 0, 22, /* length */ | |
151 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
beed53a1 KJH |
152 | 0, 0, 0, 0, /* TPM_CAP_<TYPE> */ |
153 | 0, 0, 0, 4, /* TPM_CAP_SUB_<TYPE> size */ | |
154 | 0, 0, 1, 0 /* TPM_CAP_SUB_<TYPE> */ | |
1da177e4 LT |
155 | }; |
156 | ||
beed53a1 KJH |
157 | static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len, |
158 | char *desc) | |
159 | { | |
160 | int err; | |
161 | ||
162 | len = tpm_transmit(chip, data, len); | |
163 | if (len < 0) | |
164 | return len; | |
165 | if (len == TPM_ERROR_SIZE) { | |
166 | err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))); | |
167 | dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc); | |
168 | return err; | |
169 | } | |
170 | return 0; | |
171 | } | |
172 | ||
dff37e4b | 173 | static const u8 pcrread[] = { |
1da177e4 LT |
174 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
175 | 0, 0, 0, 14, /* length */ | |
176 | 0, 0, 0, 21, /* TPM_ORD_PcrRead */ | |
177 | 0, 0, 0, 0 /* PCR index */ | |
178 | }; | |
179 | ||
6659ca2a KH |
180 | ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr, |
181 | char *buf) | |
1da177e4 | 182 | { |
beed53a1 KJH |
183 | u8 data[30]; |
184 | ssize_t rc; | |
81179bb6 KH |
185 | int i, j, num_pcrs; |
186 | __be32 index; | |
1da177e4 LT |
187 | char *str = buf; |
188 | ||
e659a3fe | 189 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
190 | if (chip == NULL) |
191 | return -ENODEV; | |
192 | ||
beed53a1 KJH |
193 | memcpy(data, tpm_cap, sizeof(tpm_cap)); |
194 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
195 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR; | |
196 | ||
197 | rc = transmit_cmd(chip, data, sizeof(data), | |
198 | "attempting to determine the number of PCRS"); | |
199 | if (rc) | |
e234bc97 | 200 | return 0; |
1da177e4 | 201 | |
81179bb6 | 202 | num_pcrs = be32_to_cpu(*((__be32 *) (data + 14))); |
1da177e4 LT |
203 | for (i = 0; i < num_pcrs; i++) { |
204 | memcpy(data, pcrread, sizeof(pcrread)); | |
205 | index = cpu_to_be32(i); | |
206 | memcpy(data + 10, &index, 4); | |
beed53a1 KJH |
207 | rc = transmit_cmd(chip, data, sizeof(data), |
208 | "attempting to read a PCR"); | |
209 | if (rc) | |
e234bc97 | 210 | goto out; |
1da177e4 LT |
211 | str += sprintf(str, "PCR-%02d: ", i); |
212 | for (j = 0; j < TPM_DIGEST_SIZE; j++) | |
213 | str += sprintf(str, "%02X ", *(data + 10 + j)); | |
214 | str += sprintf(str, "\n"); | |
215 | } | |
e234bc97 | 216 | out: |
1da177e4 LT |
217 | return str - buf; |
218 | } | |
6659ca2a | 219 | EXPORT_SYMBOL_GPL(tpm_show_pcrs); |
1da177e4 LT |
220 | |
221 | #define READ_PUBEK_RESULT_SIZE 314 | |
dff37e4b | 222 | static const u8 readpubek[] = { |
1da177e4 LT |
223 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
224 | 0, 0, 0, 30, /* length */ | |
225 | 0, 0, 0, 124, /* TPM_ORD_ReadPubek */ | |
226 | }; | |
227 | ||
6659ca2a KH |
228 | ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr, |
229 | char *buf) | |
1da177e4 | 230 | { |
2df7111f | 231 | u8 *data; |
beed53a1 | 232 | ssize_t err; |
81179bb6 | 233 | int i, rc; |
1da177e4 LT |
234 | char *str = buf; |
235 | ||
e659a3fe | 236 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
237 | if (chip == NULL) |
238 | return -ENODEV; | |
239 | ||
b888c87b | 240 | data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL); |
2df7111f KH |
241 | if (!data) |
242 | return -ENOMEM; | |
243 | ||
1da177e4 | 244 | memcpy(data, readpubek, sizeof(readpubek)); |
1da177e4 | 245 | |
beed53a1 KJH |
246 | err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE, |
247 | "attempting to read the PUBEK"); | |
248 | if (err) | |
34d6e075 | 249 | goto out; |
1da177e4 LT |
250 | |
251 | /* | |
252 | ignore header 10 bytes | |
253 | algorithm 32 bits (1 == RSA ) | |
254 | encscheme 16 bits | |
255 | sigscheme 16 bits | |
256 | parameters (RSA 12->bytes: keybit, #primes, expbit) | |
257 | keylenbytes 32 bits | |
258 | 256 byte modulus | |
259 | ignore checksum 20 bytes | |
260 | */ | |
261 | ||
1da177e4 LT |
262 | str += |
263 | sprintf(str, | |
264 | "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n" | |
265 | "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X" | |
266 | " %02X %02X %02X %02X %02X %02X %02X %02X\n" | |
267 | "Modulus length: %d\nModulus: \n", | |
268 | data[10], data[11], data[12], data[13], data[14], | |
269 | data[15], data[16], data[17], data[22], data[23], | |
270 | data[24], data[25], data[26], data[27], data[28], | |
271 | data[29], data[30], data[31], data[32], data[33], | |
1dda8abe | 272 | be32_to_cpu(*((__be32 *) (data + 34)))); |
1da177e4 LT |
273 | |
274 | for (i = 0; i < 256; i++) { | |
1dda8abe | 275 | str += sprintf(str, "%02X ", data[i + 38]); |
1da177e4 LT |
276 | if ((i + 1) % 16 == 0) |
277 | str += sprintf(str, "\n"); | |
278 | } | |
34d6e075 | 279 | out: |
beed53a1 | 280 | rc = str - buf; |
2df7111f KH |
281 | kfree(data); |
282 | return rc; | |
1da177e4 | 283 | } |
6659ca2a | 284 | EXPORT_SYMBOL_GPL(tpm_show_pubek); |
1da177e4 | 285 | |
beed53a1 KJH |
286 | #define CAP_VERSION_1_1 6 |
287 | #define CAP_VERSION_IDX 13 | |
dff37e4b | 288 | static const u8 cap_version[] = { |
1da177e4 LT |
289 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
290 | 0, 0, 0, 18, /* length */ | |
291 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
beed53a1 | 292 | 0, 0, 0, 0, |
1da177e4 LT |
293 | 0, 0, 0, 0 |
294 | }; | |
295 | ||
6659ca2a KH |
296 | ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr, |
297 | char *buf) | |
1da177e4 | 298 | { |
beed53a1 KJH |
299 | u8 data[30]; |
300 | ssize_t rc; | |
1da177e4 LT |
301 | char *str = buf; |
302 | ||
e659a3fe | 303 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
304 | if (chip == NULL) |
305 | return -ENODEV; | |
306 | ||
beed53a1 KJH |
307 | memcpy(data, tpm_cap, sizeof(tpm_cap)); |
308 | data[TPM_CAP_IDX] = TPM_CAP_PROP; | |
309 | data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER; | |
1da177e4 | 310 | |
beed53a1 KJH |
311 | rc = transmit_cmd(chip, data, sizeof(data), |
312 | "attempting to determine the manufacturer"); | |
313 | if (rc) | |
314 | return 0; | |
1da177e4 LT |
315 | |
316 | str += sprintf(str, "Manufacturer: 0x%x\n", | |
beed53a1 | 317 | be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)))); |
1da177e4 LT |
318 | |
319 | memcpy(data, cap_version, sizeof(cap_version)); | |
beed53a1 KJH |
320 | data[CAP_VERSION_IDX] = CAP_VERSION_1_1; |
321 | rc = transmit_cmd(chip, data, sizeof(data), | |
322 | "attempting to determine the 1.1 version"); | |
323 | if (rc) | |
324 | goto out; | |
1da177e4 | 325 | |
beed53a1 KJH |
326 | str += sprintf(str, |
327 | "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
328 | (int) data[14], (int) data[15], (int) data[16], | |
329 | (int) data[17]); | |
1da177e4 | 330 | |
beed53a1 | 331 | out: |
1da177e4 LT |
332 | return str - buf; |
333 | } | |
6659ca2a KH |
334 | EXPORT_SYMBOL_GPL(tpm_show_caps); |
335 | ||
336 | ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr, | |
337 | const char *buf, size_t count) | |
338 | { | |
339 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
340 | if (chip == NULL) | |
341 | return 0; | |
342 | ||
343 | chip->vendor->cancel(chip); | |
344 | return count; | |
345 | } | |
346 | EXPORT_SYMBOL_GPL(tpm_store_cancel); | |
1da177e4 | 347 | |
1da177e4 LT |
348 | /* |
349 | * Device file system interface to the TPM | |
350 | */ | |
351 | int tpm_open(struct inode *inode, struct file *file) | |
352 | { | |
353 | int rc = 0, minor = iminor(inode); | |
354 | struct tpm_chip *chip = NULL, *pos; | |
355 | ||
356 | spin_lock(&driver_lock); | |
357 | ||
358 | list_for_each_entry(pos, &tpm_chip_list, list) { | |
359 | if (pos->vendor->miscdev.minor == minor) { | |
360 | chip = pos; | |
361 | break; | |
362 | } | |
363 | } | |
364 | ||
365 | if (chip == NULL) { | |
366 | rc = -ENODEV; | |
367 | goto err_out; | |
368 | } | |
369 | ||
370 | if (chip->num_opens) { | |
b888c87b | 371 | dev_dbg(chip->dev, "Another process owns this TPM\n"); |
1da177e4 LT |
372 | rc = -EBUSY; |
373 | goto err_out; | |
374 | } | |
375 | ||
376 | chip->num_opens++; | |
e659a3fe | 377 | get_device(chip->dev); |
1da177e4 LT |
378 | |
379 | spin_unlock(&driver_lock); | |
380 | ||
381 | chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); | |
382 | if (chip->data_buffer == NULL) { | |
383 | chip->num_opens--; | |
e659a3fe | 384 | put_device(chip->dev); |
1da177e4 LT |
385 | return -ENOMEM; |
386 | } | |
387 | ||
388 | atomic_set(&chip->data_pending, 0); | |
389 | ||
390 | file->private_data = chip; | |
391 | return 0; | |
392 | ||
393 | err_out: | |
394 | spin_unlock(&driver_lock); | |
395 | return rc; | |
396 | } | |
1da177e4 LT |
397 | EXPORT_SYMBOL_GPL(tpm_open); |
398 | ||
399 | int tpm_release(struct inode *inode, struct file *file) | |
400 | { | |
401 | struct tpm_chip *chip = file->private_data; | |
1da177e4 LT |
402 | |
403 | spin_lock(&driver_lock); | |
5e976d55 | 404 | file->private_data = NULL; |
1da177e4 | 405 | chip->num_opens--; |
fe3fd483 | 406 | del_singleshot_timer_sync(&chip->user_read_timer); |
ba396115 | 407 | flush_scheduled_work(); |
1da177e4 | 408 | atomic_set(&chip->data_pending, 0); |
e659a3fe | 409 | put_device(chip->dev); |
5e976d55 KH |
410 | kfree(chip->data_buffer); |
411 | spin_unlock(&driver_lock); | |
1da177e4 LT |
412 | return 0; |
413 | } | |
1da177e4 LT |
414 | EXPORT_SYMBOL_GPL(tpm_release); |
415 | ||
b888c87b | 416 | ssize_t tpm_write(struct file *file, const char __user *buf, |
3c2f606a | 417 | size_t size, loff_t *off) |
1da177e4 LT |
418 | { |
419 | struct tpm_chip *chip = file->private_data; | |
420 | int in_size = size, out_size; | |
421 | ||
422 | /* cannot perform a write until the read has cleared | |
423 | either via tpm_read or a user_read_timer timeout */ | |
700d8bdc NA |
424 | while (atomic_read(&chip->data_pending) != 0) |
425 | msleep(TPM_TIMEOUT); | |
1da177e4 LT |
426 | |
427 | down(&chip->buffer_mutex); | |
428 | ||
429 | if (in_size > TPM_BUFSIZE) | |
430 | in_size = TPM_BUFSIZE; | |
431 | ||
432 | if (copy_from_user | |
433 | (chip->data_buffer, (void __user *) buf, in_size)) { | |
434 | up(&chip->buffer_mutex); | |
435 | return -EFAULT; | |
436 | } | |
437 | ||
438 | /* atomic tpm command send and result receive */ | |
439 | out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE); | |
440 | ||
441 | atomic_set(&chip->data_pending, out_size); | |
442 | up(&chip->buffer_mutex); | |
443 | ||
444 | /* Set a timeout by which the reader must come claim the result */ | |
fe3fd483 | 445 | mod_timer(&chip->user_read_timer, jiffies + (60 * HZ)); |
1da177e4 LT |
446 | |
447 | return in_size; | |
448 | } | |
1da177e4 LT |
449 | EXPORT_SYMBOL_GPL(tpm_write); |
450 | ||
3c2f606a KJH |
451 | ssize_t tpm_read(struct file *file, char __user *buf, |
452 | size_t size, loff_t *off) | |
1da177e4 LT |
453 | { |
454 | struct tpm_chip *chip = file->private_data; | |
5b44bd58 | 455 | int ret_size; |
1da177e4 | 456 | |
5b44bd58 | 457 | del_singleshot_timer_sync(&chip->user_read_timer); |
ba396115 | 458 | flush_scheduled_work(); |
5b44bd58 KH |
459 | ret_size = atomic_read(&chip->data_pending); |
460 | atomic_set(&chip->data_pending, 0); | |
461 | if (ret_size > 0) { /* relay data */ | |
462 | if (size < ret_size) | |
463 | ret_size = size; | |
1da177e4 LT |
464 | |
465 | down(&chip->buffer_mutex); | |
f6a2382c | 466 | if (copy_to_user(buf, chip->data_buffer, ret_size)) |
5b44bd58 | 467 | ret_size = -EFAULT; |
1da177e4 LT |
468 | up(&chip->buffer_mutex); |
469 | } | |
470 | ||
471 | return ret_size; | |
472 | } | |
1da177e4 LT |
473 | EXPORT_SYMBOL_GPL(tpm_read); |
474 | ||
e659a3fe | 475 | void tpm_remove_hardware(struct device *dev) |
1da177e4 | 476 | { |
e659a3fe | 477 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
478 | |
479 | if (chip == NULL) { | |
e659a3fe | 480 | dev_err(dev, "No device data found\n"); |
1da177e4 LT |
481 | return; |
482 | } | |
483 | ||
484 | spin_lock(&driver_lock); | |
485 | ||
486 | list_del(&chip->list); | |
487 | ||
488 | spin_unlock(&driver_lock); | |
489 | ||
e659a3fe | 490 | dev_set_drvdata(dev, NULL); |
1da177e4 | 491 | misc_deregister(&chip->vendor->miscdev); |
9a936eb9 | 492 | kfree(chip->vendor->miscdev.name); |
1da177e4 | 493 | |
e659a3fe | 494 | sysfs_remove_group(&dev->kobj, chip->vendor->attr_group); |
55a82ab3 | 495 | tpm_bios_log_teardown(chip->bios_dir); |
1da177e4 | 496 | |
b888c87b | 497 | dev_mask[chip->dev_num / TPM_NUM_MASK_ENTRIES ] &= |
f6a2382c | 498 | ~(1 << (chip->dev_num % TPM_NUM_MASK_ENTRIES)); |
1da177e4 LT |
499 | |
500 | kfree(chip); | |
501 | ||
e659a3fe | 502 | put_device(dev); |
1da177e4 | 503 | } |
e659a3fe | 504 | EXPORT_SYMBOL_GPL(tpm_remove_hardware); |
1da177e4 LT |
505 | |
506 | static u8 savestate[] = { | |
507 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
508 | 0, 0, 0, 10, /* blob length (in bytes) */ | |
509 | 0, 0, 0, 152 /* TPM_ORD_SaveState */ | |
510 | }; | |
511 | ||
512 | /* | |
513 | * We are about to suspend. Save the TPM state | |
514 | * so that it can be restored. | |
515 | */ | |
ce2c87d4 | 516 | int tpm_pm_suspend(struct device *dev, pm_message_t pm_state) |
1da177e4 | 517 | { |
ce2c87d4 | 518 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
519 | if (chip == NULL) |
520 | return -ENODEV; | |
521 | ||
522 | tpm_transmit(chip, savestate, sizeof(savestate)); | |
523 | return 0; | |
524 | } | |
1da177e4 LT |
525 | EXPORT_SYMBOL_GPL(tpm_pm_suspend); |
526 | ||
527 | /* | |
528 | * Resume from a power safe. The BIOS already restored | |
529 | * the TPM state. | |
530 | */ | |
ce2c87d4 | 531 | int tpm_pm_resume(struct device *dev) |
1da177e4 | 532 | { |
ce2c87d4 | 533 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
534 | |
535 | if (chip == NULL) | |
536 | return -ENODEV; | |
537 | ||
1da177e4 LT |
538 | return 0; |
539 | } | |
1da177e4 LT |
540 | EXPORT_SYMBOL_GPL(tpm_pm_resume); |
541 | ||
542 | /* | |
543 | * Called from tpm_<specific>.c probe function only for devices | |
544 | * the driver has determined it should claim. Prior to calling | |
545 | * this function the specific probe function has called pci_enable_device | |
546 | * upon errant exit from this function specific probe function should call | |
547 | * pci_disable_device | |
548 | */ | |
b888c87b | 549 | int tpm_register_hardware(struct device *dev, struct tpm_vendor_specific *entry) |
1da177e4 | 550 | { |
6f9beccb KJH |
551 | #define DEVNAME_SIZE 7 |
552 | ||
553 | char *devname; | |
1da177e4 LT |
554 | struct tpm_chip *chip; |
555 | int i, j; | |
556 | ||
557 | /* Driver specific per-device data */ | |
b888c87b | 558 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
1da177e4 LT |
559 | if (chip == NULL) |
560 | return -ENOMEM; | |
561 | ||
1da177e4 LT |
562 | init_MUTEX(&chip->buffer_mutex); |
563 | init_MUTEX(&chip->tpm_mutex); | |
1da177e4 LT |
564 | INIT_LIST_HEAD(&chip->list); |
565 | ||
09e12f9f KJH |
566 | INIT_WORK(&chip->work, timeout_work, chip); |
567 | ||
fe3fd483 KH |
568 | init_timer(&chip->user_read_timer); |
569 | chip->user_read_timer.function = user_reader_timeout; | |
570 | chip->user_read_timer.data = (unsigned long) chip; | |
571 | ||
1da177e4 LT |
572 | chip->vendor = entry; |
573 | ||
574 | chip->dev_num = -1; | |
575 | ||
3122a88a KH |
576 | for (i = 0; i < TPM_NUM_MASK_ENTRIES; i++) |
577 | for (j = 0; j < 8 * sizeof(int); j++) | |
1da177e4 | 578 | if ((dev_mask[i] & (1 << j)) == 0) { |
3122a88a KH |
579 | chip->dev_num = |
580 | i * TPM_NUM_MASK_ENTRIES + j; | |
1da177e4 LT |
581 | dev_mask[i] |= 1 << j; |
582 | goto dev_num_search_complete; | |
583 | } | |
584 | ||
585 | dev_num_search_complete: | |
586 | if (chip->dev_num < 0) { | |
b888c87b | 587 | dev_err(dev, "No available tpm device numbers\n"); |
1da177e4 LT |
588 | kfree(chip); |
589 | return -ENODEV; | |
590 | } else if (chip->dev_num == 0) | |
591 | chip->vendor->miscdev.minor = TPM_MINOR; | |
592 | else | |
593 | chip->vendor->miscdev.minor = MISC_DYNAMIC_MINOR; | |
594 | ||
6f9beccb KJH |
595 | devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL); |
596 | scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num); | |
1da177e4 LT |
597 | chip->vendor->miscdev.name = devname; |
598 | ||
e659a3fe KJH |
599 | chip->vendor->miscdev.dev = dev; |
600 | chip->dev = get_device(dev); | |
1da177e4 LT |
601 | |
602 | if (misc_register(&chip->vendor->miscdev)) { | |
e659a3fe | 603 | dev_err(chip->dev, |
1da177e4 LT |
604 | "unable to misc_register %s, minor %d\n", |
605 | chip->vendor->miscdev.name, | |
606 | chip->vendor->miscdev.minor); | |
e659a3fe | 607 | put_device(dev); |
1da177e4 LT |
608 | kfree(chip); |
609 | dev_mask[i] &= !(1 << j); | |
610 | return -ENODEV; | |
611 | } | |
612 | ||
5e976d55 KH |
613 | spin_lock(&driver_lock); |
614 | ||
e659a3fe | 615 | dev_set_drvdata(dev, chip); |
1da177e4 LT |
616 | |
617 | list_add(&chip->list, &tpm_chip_list); | |
618 | ||
5e976d55 KH |
619 | spin_unlock(&driver_lock); |
620 | ||
e659a3fe | 621 | sysfs_create_group(&dev->kobj, chip->vendor->attr_group); |
1da177e4 | 622 | |
55a82ab3 KJH |
623 | chip->bios_dir = tpm_bios_log_setup(devname); |
624 | ||
1da177e4 LT |
625 | return 0; |
626 | } | |
1da177e4 LT |
627 | EXPORT_SYMBOL_GPL(tpm_register_hardware); |
628 | ||
1da177e4 LT |
629 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); |
630 | MODULE_DESCRIPTION("TPM Driver"); | |
631 | MODULE_VERSION("2.0"); | |
632 | MODULE_LICENSE("GPL"); |