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 | |
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 | ||
46 | down(&chip->buffer_mutex); | |
47 | atomic_set(&chip->data_pending, 0); | |
48 | memset(chip->data_buffer, 0, TPM_BUFSIZE); | |
49 | up(&chip->buffer_mutex); | |
50 | } | |
51 | ||
1da177e4 LT |
52 | /* |
53 | * Internal kernel interface to transmit TPM commands | |
54 | */ | |
55 | static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf, | |
56 | size_t bufsiz) | |
57 | { | |
d9e5b6bf | 58 | ssize_t rc; |
1da177e4 | 59 | u32 count; |
700d8bdc | 60 | unsigned long stop; |
1da177e4 | 61 | |
81179bb6 | 62 | count = be32_to_cpu(*((__be32 *) (buf + 2))); |
1da177e4 LT |
63 | |
64 | if (count == 0) | |
65 | return -ENODATA; | |
66 | if (count > bufsiz) { | |
e659a3fe | 67 | dev_err(chip->dev, |
b76be681 | 68 | "invalid count value %x %zx \n", count, bufsiz); |
1da177e4 LT |
69 | return -E2BIG; |
70 | } | |
71 | ||
72 | down(&chip->tpm_mutex); | |
73 | ||
d9e5b6bf | 74 | if ((rc = chip->vendor->send(chip, (u8 *) buf, count)) < 0) { |
e659a3fe | 75 | dev_err(chip->dev, |
d9e5b6bf KH |
76 | "tpm_transmit: tpm_send: error %zd\n", rc); |
77 | goto out; | |
1da177e4 LT |
78 | } |
79 | ||
700d8bdc | 80 | stop = jiffies + 2 * 60 * HZ; |
1da177e4 | 81 | do { |
b4ed3e3c | 82 | u8 status = chip->vendor->status(chip); |
1da177e4 LT |
83 | if ((status & chip->vendor->req_complete_mask) == |
84 | chip->vendor->req_complete_val) { | |
1da177e4 LT |
85 | goto out_recv; |
86 | } | |
d9e5b6bf KH |
87 | |
88 | if ((status == chip->vendor->req_canceled)) { | |
e659a3fe | 89 | dev_err(chip->dev, "Operation Canceled\n"); |
d9e5b6bf KH |
90 | rc = -ECANCELED; |
91 | goto out; | |
92 | } | |
93 | ||
94 | msleep(TPM_TIMEOUT); /* CHECK */ | |
1da177e4 | 95 | rmb(); |
700d8bdc | 96 | } while (time_before(jiffies, stop)); |
1da177e4 LT |
97 | |
98 | ||
99 | chip->vendor->cancel(chip); | |
e659a3fe | 100 | dev_err(chip->dev, "Operation Timed out\n"); |
d9e5b6bf KH |
101 | rc = -ETIME; |
102 | goto out; | |
1da177e4 LT |
103 | |
104 | out_recv: | |
d9e5b6bf KH |
105 | rc = chip->vendor->recv(chip, (u8 *) buf, bufsiz); |
106 | if (rc < 0) | |
e659a3fe | 107 | dev_err(chip->dev, |
d9e5b6bf KH |
108 | "tpm_transmit: tpm_recv: error %zd\n", rc); |
109 | out: | |
1da177e4 | 110 | up(&chip->tpm_mutex); |
d9e5b6bf | 111 | return rc; |
1da177e4 LT |
112 | } |
113 | ||
114 | #define TPM_DIGEST_SIZE 20 | |
115 | #define CAP_PCR_RESULT_SIZE 18 | |
dff37e4b | 116 | static const u8 cap_pcr[] = { |
1da177e4 LT |
117 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
118 | 0, 0, 0, 22, /* length */ | |
119 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
120 | 0, 0, 0, 5, | |
121 | 0, 0, 0, 4, | |
122 | 0, 0, 1, 1 | |
123 | }; | |
124 | ||
125 | #define READ_PCR_RESULT_SIZE 30 | |
dff37e4b | 126 | static const u8 pcrread[] = { |
1da177e4 LT |
127 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
128 | 0, 0, 0, 14, /* length */ | |
129 | 0, 0, 0, 21, /* TPM_ORD_PcrRead */ | |
130 | 0, 0, 0, 0 /* PCR index */ | |
131 | }; | |
132 | ||
6659ca2a KH |
133 | ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr, |
134 | char *buf) | |
1da177e4 LT |
135 | { |
136 | u8 data[READ_PCR_RESULT_SIZE]; | |
137 | ssize_t len; | |
81179bb6 KH |
138 | int i, j, num_pcrs; |
139 | __be32 index; | |
1da177e4 LT |
140 | char *str = buf; |
141 | ||
e659a3fe | 142 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
143 | if (chip == NULL) |
144 | return -ENODEV; | |
145 | ||
146 | memcpy(data, cap_pcr, sizeof(cap_pcr)); | |
147 | if ((len = tpm_transmit(chip, data, sizeof(data))) | |
e234bc97 | 148 | < CAP_PCR_RESULT_SIZE) { |
e659a3fe | 149 | dev_dbg(chip->dev, "A TPM error (%d) occurred " |
e234bc97 KH |
150 | "attempting to determine the number of PCRS\n", |
151 | be32_to_cpu(*((__be32 *) (data + 6)))); | |
152 | return 0; | |
153 | } | |
1da177e4 | 154 | |
81179bb6 | 155 | num_pcrs = be32_to_cpu(*((__be32 *) (data + 14))); |
1da177e4 LT |
156 | |
157 | for (i = 0; i < num_pcrs; i++) { | |
158 | memcpy(data, pcrread, sizeof(pcrread)); | |
159 | index = cpu_to_be32(i); | |
160 | memcpy(data + 10, &index, 4); | |
161 | if ((len = tpm_transmit(chip, data, sizeof(data))) | |
e234bc97 | 162 | < READ_PCR_RESULT_SIZE){ |
e659a3fe | 163 | dev_dbg(chip->dev, "A TPM error (%d) occurred" |
e234bc97 KH |
164 | " attempting to read PCR %d of %d\n", |
165 | be32_to_cpu(*((__be32 *) (data + 6))), i, num_pcrs); | |
166 | goto out; | |
167 | } | |
1da177e4 LT |
168 | str += sprintf(str, "PCR-%02d: ", i); |
169 | for (j = 0; j < TPM_DIGEST_SIZE; j++) | |
170 | str += sprintf(str, "%02X ", *(data + 10 + j)); | |
171 | str += sprintf(str, "\n"); | |
172 | } | |
e234bc97 | 173 | out: |
1da177e4 LT |
174 | return str - buf; |
175 | } | |
6659ca2a | 176 | EXPORT_SYMBOL_GPL(tpm_show_pcrs); |
1da177e4 LT |
177 | |
178 | #define READ_PUBEK_RESULT_SIZE 314 | |
dff37e4b | 179 | static const u8 readpubek[] = { |
1da177e4 LT |
180 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
181 | 0, 0, 0, 30, /* length */ | |
182 | 0, 0, 0, 124, /* TPM_ORD_ReadPubek */ | |
183 | }; | |
184 | ||
6659ca2a KH |
185 | ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr, |
186 | char *buf) | |
1da177e4 | 187 | { |
2df7111f | 188 | u8 *data; |
1da177e4 | 189 | ssize_t len; |
81179bb6 | 190 | int i, rc; |
1da177e4 LT |
191 | char *str = buf; |
192 | ||
e659a3fe | 193 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
194 | if (chip == NULL) |
195 | return -ENODEV; | |
196 | ||
2df7111f KH |
197 | data = kmalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL); |
198 | if (!data) | |
199 | return -ENOMEM; | |
200 | ||
1da177e4 LT |
201 | memcpy(data, readpubek, sizeof(readpubek)); |
202 | memset(data + sizeof(readpubek), 0, 20); /* zero nonce */ | |
203 | ||
2df7111f KH |
204 | if ((len = tpm_transmit(chip, data, READ_PUBEK_RESULT_SIZE)) < |
205 | READ_PUBEK_RESULT_SIZE) { | |
e659a3fe | 206 | dev_dbg(chip->dev, "A TPM error (%d) occurred " |
e234bc97 KH |
207 | "attempting to read the PUBEK\n", |
208 | be32_to_cpu(*((__be32 *) (data + 6)))); | |
34d6e075 KJH |
209 | rc = 0; |
210 | goto out; | |
2df7111f | 211 | } |
1da177e4 LT |
212 | |
213 | /* | |
214 | ignore header 10 bytes | |
215 | algorithm 32 bits (1 == RSA ) | |
216 | encscheme 16 bits | |
217 | sigscheme 16 bits | |
218 | parameters (RSA 12->bytes: keybit, #primes, expbit) | |
219 | keylenbytes 32 bits | |
220 | 256 byte modulus | |
221 | ignore checksum 20 bytes | |
222 | */ | |
223 | ||
1da177e4 LT |
224 | str += |
225 | sprintf(str, | |
226 | "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n" | |
227 | "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X" | |
228 | " %02X %02X %02X %02X %02X %02X %02X %02X\n" | |
229 | "Modulus length: %d\nModulus: \n", | |
230 | data[10], data[11], data[12], data[13], data[14], | |
231 | data[15], data[16], data[17], data[22], data[23], | |
232 | data[24], data[25], data[26], data[27], data[28], | |
233 | data[29], data[30], data[31], data[32], data[33], | |
1dda8abe | 234 | be32_to_cpu(*((__be32 *) (data + 34)))); |
1da177e4 LT |
235 | |
236 | for (i = 0; i < 256; i++) { | |
1dda8abe | 237 | str += sprintf(str, "%02X ", data[i + 38]); |
1da177e4 LT |
238 | if ((i + 1) % 16 == 0) |
239 | str += sprintf(str, "\n"); | |
240 | } | |
2df7111f | 241 | rc = str - buf; |
34d6e075 | 242 | out: |
2df7111f KH |
243 | kfree(data); |
244 | return rc; | |
1da177e4 LT |
245 | } |
246 | ||
6659ca2a | 247 | EXPORT_SYMBOL_GPL(tpm_show_pubek); |
1da177e4 LT |
248 | |
249 | #define CAP_VER_RESULT_SIZE 18 | |
dff37e4b | 250 | static const u8 cap_version[] = { |
1da177e4 LT |
251 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
252 | 0, 0, 0, 18, /* length */ | |
253 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
254 | 0, 0, 0, 6, | |
255 | 0, 0, 0, 0 | |
256 | }; | |
257 | ||
258 | #define CAP_MANUFACTURER_RESULT_SIZE 18 | |
dff37e4b | 259 | static const u8 cap_manufacturer[] = { |
1da177e4 LT |
260 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
261 | 0, 0, 0, 22, /* length */ | |
262 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
263 | 0, 0, 0, 5, | |
264 | 0, 0, 0, 4, | |
265 | 0, 0, 1, 3 | |
266 | }; | |
267 | ||
6659ca2a KH |
268 | ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr, |
269 | char *buf) | |
1da177e4 | 270 | { |
2df7111f | 271 | u8 data[sizeof(cap_manufacturer)]; |
1da177e4 LT |
272 | ssize_t len; |
273 | char *str = buf; | |
274 | ||
e659a3fe | 275 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
276 | if (chip == NULL) |
277 | return -ENODEV; | |
278 | ||
279 | memcpy(data, cap_manufacturer, sizeof(cap_manufacturer)); | |
280 | ||
281 | if ((len = tpm_transmit(chip, data, sizeof(data))) < | |
282 | CAP_MANUFACTURER_RESULT_SIZE) | |
283 | return len; | |
284 | ||
285 | str += sprintf(str, "Manufacturer: 0x%x\n", | |
81179bb6 | 286 | be32_to_cpu(*((__be32 *) (data + 14)))); |
1da177e4 LT |
287 | |
288 | memcpy(data, cap_version, sizeof(cap_version)); | |
289 | ||
290 | if ((len = tpm_transmit(chip, data, sizeof(data))) < | |
291 | CAP_VER_RESULT_SIZE) | |
292 | return len; | |
293 | ||
294 | str += | |
295 | sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
296 | (int) data[14], (int) data[15], (int) data[16], | |
297 | (int) data[17]); | |
298 | ||
299 | return str - buf; | |
300 | } | |
6659ca2a KH |
301 | EXPORT_SYMBOL_GPL(tpm_show_caps); |
302 | ||
303 | ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr, | |
304 | const char *buf, size_t count) | |
305 | { | |
306 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
307 | if (chip == NULL) | |
308 | return 0; | |
309 | ||
310 | chip->vendor->cancel(chip); | |
311 | return count; | |
312 | } | |
313 | EXPORT_SYMBOL_GPL(tpm_store_cancel); | |
1da177e4 | 314 | |
1da177e4 LT |
315 | |
316 | /* | |
317 | * Device file system interface to the TPM | |
318 | */ | |
319 | int tpm_open(struct inode *inode, struct file *file) | |
320 | { | |
321 | int rc = 0, minor = iminor(inode); | |
322 | struct tpm_chip *chip = NULL, *pos; | |
323 | ||
324 | spin_lock(&driver_lock); | |
325 | ||
326 | list_for_each_entry(pos, &tpm_chip_list, list) { | |
327 | if (pos->vendor->miscdev.minor == minor) { | |
328 | chip = pos; | |
329 | break; | |
330 | } | |
331 | } | |
332 | ||
333 | if (chip == NULL) { | |
334 | rc = -ENODEV; | |
335 | goto err_out; | |
336 | } | |
337 | ||
338 | if (chip->num_opens) { | |
e659a3fe | 339 | dev_dbg(chip->dev, |
1da177e4 LT |
340 | "Another process owns this TPM\n"); |
341 | rc = -EBUSY; | |
342 | goto err_out; | |
343 | } | |
344 | ||
345 | chip->num_opens++; | |
e659a3fe | 346 | get_device(chip->dev); |
1da177e4 LT |
347 | |
348 | spin_unlock(&driver_lock); | |
349 | ||
350 | chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); | |
351 | if (chip->data_buffer == NULL) { | |
352 | chip->num_opens--; | |
e659a3fe | 353 | put_device(chip->dev); |
1da177e4 LT |
354 | return -ENOMEM; |
355 | } | |
356 | ||
357 | atomic_set(&chip->data_pending, 0); | |
358 | ||
359 | file->private_data = chip; | |
360 | return 0; | |
361 | ||
362 | err_out: | |
363 | spin_unlock(&driver_lock); | |
364 | return rc; | |
365 | } | |
366 | ||
367 | EXPORT_SYMBOL_GPL(tpm_open); | |
368 | ||
369 | int tpm_release(struct inode *inode, struct file *file) | |
370 | { | |
371 | struct tpm_chip *chip = file->private_data; | |
1da177e4 LT |
372 | |
373 | spin_lock(&driver_lock); | |
5e976d55 | 374 | file->private_data = NULL; |
1da177e4 | 375 | chip->num_opens--; |
fe3fd483 | 376 | del_singleshot_timer_sync(&chip->user_read_timer); |
1da177e4 | 377 | atomic_set(&chip->data_pending, 0); |
e659a3fe | 378 | put_device(chip->dev); |
5e976d55 KH |
379 | kfree(chip->data_buffer); |
380 | spin_unlock(&driver_lock); | |
1da177e4 LT |
381 | return 0; |
382 | } | |
383 | ||
384 | EXPORT_SYMBOL_GPL(tpm_release); | |
385 | ||
386 | ssize_t tpm_write(struct file * file, const char __user * buf, | |
387 | size_t size, loff_t * off) | |
388 | { | |
389 | struct tpm_chip *chip = file->private_data; | |
390 | int in_size = size, out_size; | |
391 | ||
392 | /* cannot perform a write until the read has cleared | |
393 | either via tpm_read or a user_read_timer timeout */ | |
700d8bdc NA |
394 | while (atomic_read(&chip->data_pending) != 0) |
395 | msleep(TPM_TIMEOUT); | |
1da177e4 LT |
396 | |
397 | down(&chip->buffer_mutex); | |
398 | ||
399 | if (in_size > TPM_BUFSIZE) | |
400 | in_size = TPM_BUFSIZE; | |
401 | ||
402 | if (copy_from_user | |
403 | (chip->data_buffer, (void __user *) buf, in_size)) { | |
404 | up(&chip->buffer_mutex); | |
405 | return -EFAULT; | |
406 | } | |
407 | ||
408 | /* atomic tpm command send and result receive */ | |
409 | out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE); | |
410 | ||
411 | atomic_set(&chip->data_pending, out_size); | |
412 | up(&chip->buffer_mutex); | |
413 | ||
414 | /* Set a timeout by which the reader must come claim the result */ | |
fe3fd483 | 415 | mod_timer(&chip->user_read_timer, jiffies + (60 * HZ)); |
1da177e4 LT |
416 | |
417 | return in_size; | |
418 | } | |
419 | ||
420 | EXPORT_SYMBOL_GPL(tpm_write); | |
421 | ||
422 | ssize_t tpm_read(struct file * file, char __user * buf, | |
423 | size_t size, loff_t * off) | |
424 | { | |
425 | struct tpm_chip *chip = file->private_data; | |
5b44bd58 | 426 | int ret_size; |
1da177e4 | 427 | |
5b44bd58 KH |
428 | del_singleshot_timer_sync(&chip->user_read_timer); |
429 | ret_size = atomic_read(&chip->data_pending); | |
430 | atomic_set(&chip->data_pending, 0); | |
431 | if (ret_size > 0) { /* relay data */ | |
432 | if (size < ret_size) | |
433 | ret_size = size; | |
1da177e4 LT |
434 | |
435 | down(&chip->buffer_mutex); | |
5b44bd58 KH |
436 | if (copy_to_user |
437 | ((void __user *) buf, chip->data_buffer, ret_size)) | |
438 | ret_size = -EFAULT; | |
1da177e4 LT |
439 | up(&chip->buffer_mutex); |
440 | } | |
441 | ||
442 | return ret_size; | |
443 | } | |
444 | ||
445 | EXPORT_SYMBOL_GPL(tpm_read); | |
446 | ||
e659a3fe | 447 | void tpm_remove_hardware(struct device *dev) |
1da177e4 | 448 | { |
e659a3fe | 449 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
450 | |
451 | if (chip == NULL) { | |
e659a3fe | 452 | dev_err(dev, "No device data found\n"); |
1da177e4 LT |
453 | return; |
454 | } | |
455 | ||
456 | spin_lock(&driver_lock); | |
457 | ||
458 | list_del(&chip->list); | |
459 | ||
460 | spin_unlock(&driver_lock); | |
461 | ||
e659a3fe | 462 | dev_set_drvdata(dev, NULL); |
1da177e4 | 463 | misc_deregister(&chip->vendor->miscdev); |
9a936eb9 | 464 | kfree(chip->vendor->miscdev.name); |
1da177e4 | 465 | |
e659a3fe | 466 | sysfs_remove_group(&dev->kobj, chip->vendor->attr_group); |
1da177e4 | 467 | |
3122a88a | 468 | dev_mask[chip->dev_num / TPM_NUM_MASK_ENTRIES ] &= !(1 << (chip->dev_num % TPM_NUM_MASK_ENTRIES)); |
1da177e4 LT |
469 | |
470 | kfree(chip); | |
471 | ||
e659a3fe | 472 | put_device(dev); |
1da177e4 LT |
473 | } |
474 | ||
e659a3fe | 475 | EXPORT_SYMBOL_GPL(tpm_remove_hardware); |
1da177e4 LT |
476 | |
477 | static u8 savestate[] = { | |
478 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
479 | 0, 0, 0, 10, /* blob length (in bytes) */ | |
480 | 0, 0, 0, 152 /* TPM_ORD_SaveState */ | |
481 | }; | |
482 | ||
483 | /* | |
484 | * We are about to suspend. Save the TPM state | |
485 | * so that it can be restored. | |
486 | */ | |
ce2c87d4 | 487 | int tpm_pm_suspend(struct device *dev, pm_message_t pm_state) |
1da177e4 | 488 | { |
ce2c87d4 | 489 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
490 | if (chip == NULL) |
491 | return -ENODEV; | |
492 | ||
493 | tpm_transmit(chip, savestate, sizeof(savestate)); | |
494 | return 0; | |
495 | } | |
496 | ||
497 | EXPORT_SYMBOL_GPL(tpm_pm_suspend); | |
498 | ||
499 | /* | |
500 | * Resume from a power safe. The BIOS already restored | |
501 | * the TPM state. | |
502 | */ | |
ce2c87d4 | 503 | int tpm_pm_resume(struct device *dev) |
1da177e4 | 504 | { |
ce2c87d4 | 505 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
506 | |
507 | if (chip == NULL) | |
508 | return -ENODEV; | |
509 | ||
1da177e4 LT |
510 | return 0; |
511 | } | |
512 | ||
513 | EXPORT_SYMBOL_GPL(tpm_pm_resume); | |
514 | ||
515 | /* | |
516 | * Called from tpm_<specific>.c probe function only for devices | |
517 | * the driver has determined it should claim. Prior to calling | |
518 | * this function the specific probe function has called pci_enable_device | |
519 | * upon errant exit from this function specific probe function should call | |
520 | * pci_disable_device | |
521 | */ | |
e659a3fe | 522 | int tpm_register_hardware(struct device *dev, |
1da177e4 LT |
523 | struct tpm_vendor_specific *entry) |
524 | { | |
6f9beccb KJH |
525 | #define DEVNAME_SIZE 7 |
526 | ||
527 | char *devname; | |
1da177e4 LT |
528 | struct tpm_chip *chip; |
529 | int i, j; | |
530 | ||
531 | /* Driver specific per-device data */ | |
532 | chip = kmalloc(sizeof(*chip), GFP_KERNEL); | |
533 | if (chip == NULL) | |
534 | return -ENOMEM; | |
535 | ||
536 | memset(chip, 0, sizeof(struct tpm_chip)); | |
537 | ||
538 | init_MUTEX(&chip->buffer_mutex); | |
539 | init_MUTEX(&chip->tpm_mutex); | |
1da177e4 LT |
540 | INIT_LIST_HEAD(&chip->list); |
541 | ||
fe3fd483 KH |
542 | init_timer(&chip->user_read_timer); |
543 | chip->user_read_timer.function = user_reader_timeout; | |
544 | chip->user_read_timer.data = (unsigned long) chip; | |
545 | ||
1da177e4 LT |
546 | chip->vendor = entry; |
547 | ||
548 | chip->dev_num = -1; | |
549 | ||
3122a88a KH |
550 | for (i = 0; i < TPM_NUM_MASK_ENTRIES; i++) |
551 | for (j = 0; j < 8 * sizeof(int); j++) | |
1da177e4 | 552 | if ((dev_mask[i] & (1 << j)) == 0) { |
3122a88a KH |
553 | chip->dev_num = |
554 | i * TPM_NUM_MASK_ENTRIES + j; | |
1da177e4 LT |
555 | dev_mask[i] |= 1 << j; |
556 | goto dev_num_search_complete; | |
557 | } | |
558 | ||
559 | dev_num_search_complete: | |
560 | if (chip->dev_num < 0) { | |
e659a3fe | 561 | dev_err(dev, |
1da177e4 LT |
562 | "No available tpm device numbers\n"); |
563 | kfree(chip); | |
564 | return -ENODEV; | |
565 | } else if (chip->dev_num == 0) | |
566 | chip->vendor->miscdev.minor = TPM_MINOR; | |
567 | else | |
568 | chip->vendor->miscdev.minor = MISC_DYNAMIC_MINOR; | |
569 | ||
6f9beccb KJH |
570 | devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL); |
571 | scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num); | |
1da177e4 LT |
572 | chip->vendor->miscdev.name = devname; |
573 | ||
e659a3fe KJH |
574 | chip->vendor->miscdev.dev = dev; |
575 | chip->dev = get_device(dev); | |
1da177e4 LT |
576 | |
577 | if (misc_register(&chip->vendor->miscdev)) { | |
e659a3fe | 578 | dev_err(chip->dev, |
1da177e4 LT |
579 | "unable to misc_register %s, minor %d\n", |
580 | chip->vendor->miscdev.name, | |
581 | chip->vendor->miscdev.minor); | |
e659a3fe | 582 | put_device(dev); |
1da177e4 LT |
583 | kfree(chip); |
584 | dev_mask[i] &= !(1 << j); | |
585 | return -ENODEV; | |
586 | } | |
587 | ||
5e976d55 KH |
588 | spin_lock(&driver_lock); |
589 | ||
e659a3fe | 590 | dev_set_drvdata(dev, chip); |
1da177e4 LT |
591 | |
592 | list_add(&chip->list, &tpm_chip_list); | |
593 | ||
5e976d55 KH |
594 | spin_unlock(&driver_lock); |
595 | ||
e659a3fe | 596 | sysfs_create_group(&dev->kobj, chip->vendor->attr_group); |
1da177e4 LT |
597 | |
598 | return 0; | |
599 | } | |
600 | ||
601 | EXPORT_SYMBOL_GPL(tpm_register_hardware); | |
602 | ||
1da177e4 LT |
603 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); |
604 | MODULE_DESCRIPTION("TPM Driver"); | |
605 | MODULE_VERSION("2.0"); | |
606 | MODULE_LICENSE("GPL"); |