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 | ||
09e12f9f KJH |
46 | schedule_work(&chip->work); |
47 | } | |
48 | ||
49 | static void timeout_work(void * ptr) | |
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 | |
122 | #define CAP_PCR_RESULT_SIZE 18 | |
dff37e4b | 123 | static const u8 cap_pcr[] = { |
1da177e4 LT |
124 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
125 | 0, 0, 0, 22, /* length */ | |
126 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
127 | 0, 0, 0, 5, | |
128 | 0, 0, 0, 4, | |
129 | 0, 0, 1, 1 | |
130 | }; | |
131 | ||
132 | #define READ_PCR_RESULT_SIZE 30 | |
dff37e4b | 133 | static const u8 pcrread[] = { |
1da177e4 LT |
134 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
135 | 0, 0, 0, 14, /* length */ | |
136 | 0, 0, 0, 21, /* TPM_ORD_PcrRead */ | |
137 | 0, 0, 0, 0 /* PCR index */ | |
138 | }; | |
139 | ||
6659ca2a KH |
140 | ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr, |
141 | char *buf) | |
1da177e4 LT |
142 | { |
143 | u8 data[READ_PCR_RESULT_SIZE]; | |
144 | ssize_t len; | |
81179bb6 KH |
145 | int i, j, num_pcrs; |
146 | __be32 index; | |
1da177e4 LT |
147 | char *str = buf; |
148 | ||
e659a3fe | 149 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
150 | if (chip == NULL) |
151 | return -ENODEV; | |
152 | ||
153 | memcpy(data, cap_pcr, sizeof(cap_pcr)); | |
154 | if ((len = tpm_transmit(chip, data, sizeof(data))) | |
e234bc97 | 155 | < CAP_PCR_RESULT_SIZE) { |
e659a3fe | 156 | dev_dbg(chip->dev, "A TPM error (%d) occurred " |
e234bc97 KH |
157 | "attempting to determine the number of PCRS\n", |
158 | be32_to_cpu(*((__be32 *) (data + 6)))); | |
159 | return 0; | |
160 | } | |
1da177e4 | 161 | |
81179bb6 | 162 | num_pcrs = be32_to_cpu(*((__be32 *) (data + 14))); |
1da177e4 LT |
163 | |
164 | for (i = 0; i < num_pcrs; i++) { | |
165 | memcpy(data, pcrread, sizeof(pcrread)); | |
166 | index = cpu_to_be32(i); | |
167 | memcpy(data + 10, &index, 4); | |
168 | if ((len = tpm_transmit(chip, data, sizeof(data))) | |
e234bc97 | 169 | < READ_PCR_RESULT_SIZE){ |
e659a3fe | 170 | dev_dbg(chip->dev, "A TPM error (%d) occurred" |
e234bc97 | 171 | " attempting to read PCR %d of %d\n", |
b888c87b AM |
172 | be32_to_cpu(*((__be32 *) (data + 6))), |
173 | i, num_pcrs); | |
e234bc97 KH |
174 | goto out; |
175 | } | |
1da177e4 LT |
176 | str += sprintf(str, "PCR-%02d: ", i); |
177 | for (j = 0; j < TPM_DIGEST_SIZE; j++) | |
178 | str += sprintf(str, "%02X ", *(data + 10 + j)); | |
179 | str += sprintf(str, "\n"); | |
180 | } | |
e234bc97 | 181 | out: |
1da177e4 LT |
182 | return str - buf; |
183 | } | |
6659ca2a | 184 | EXPORT_SYMBOL_GPL(tpm_show_pcrs); |
1da177e4 LT |
185 | |
186 | #define READ_PUBEK_RESULT_SIZE 314 | |
dff37e4b | 187 | static const u8 readpubek[] = { |
1da177e4 LT |
188 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
189 | 0, 0, 0, 30, /* length */ | |
190 | 0, 0, 0, 124, /* TPM_ORD_ReadPubek */ | |
191 | }; | |
192 | ||
6659ca2a KH |
193 | ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr, |
194 | char *buf) | |
1da177e4 | 195 | { |
2df7111f | 196 | u8 *data; |
1da177e4 | 197 | ssize_t len; |
81179bb6 | 198 | int i, rc; |
1da177e4 LT |
199 | char *str = buf; |
200 | ||
e659a3fe | 201 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
202 | if (chip == NULL) |
203 | return -ENODEV; | |
204 | ||
b888c87b | 205 | data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL); |
2df7111f KH |
206 | if (!data) |
207 | return -ENOMEM; | |
208 | ||
1da177e4 | 209 | memcpy(data, readpubek, sizeof(readpubek)); |
1da177e4 | 210 | |
2df7111f KH |
211 | if ((len = tpm_transmit(chip, data, READ_PUBEK_RESULT_SIZE)) < |
212 | READ_PUBEK_RESULT_SIZE) { | |
e659a3fe | 213 | dev_dbg(chip->dev, "A TPM error (%d) occurred " |
e234bc97 KH |
214 | "attempting to read the PUBEK\n", |
215 | be32_to_cpu(*((__be32 *) (data + 6)))); | |
34d6e075 KJH |
216 | rc = 0; |
217 | goto out; | |
2df7111f | 218 | } |
1da177e4 LT |
219 | |
220 | /* | |
221 | ignore header 10 bytes | |
222 | algorithm 32 bits (1 == RSA ) | |
223 | encscheme 16 bits | |
224 | sigscheme 16 bits | |
225 | parameters (RSA 12->bytes: keybit, #primes, expbit) | |
226 | keylenbytes 32 bits | |
227 | 256 byte modulus | |
228 | ignore checksum 20 bytes | |
229 | */ | |
230 | ||
1da177e4 LT |
231 | str += |
232 | sprintf(str, | |
233 | "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n" | |
234 | "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X" | |
235 | " %02X %02X %02X %02X %02X %02X %02X %02X\n" | |
236 | "Modulus length: %d\nModulus: \n", | |
237 | data[10], data[11], data[12], data[13], data[14], | |
238 | data[15], data[16], data[17], data[22], data[23], | |
239 | data[24], data[25], data[26], data[27], data[28], | |
240 | data[29], data[30], data[31], data[32], data[33], | |
1dda8abe | 241 | be32_to_cpu(*((__be32 *) (data + 34)))); |
1da177e4 LT |
242 | |
243 | for (i = 0; i < 256; i++) { | |
1dda8abe | 244 | str += sprintf(str, "%02X ", data[i + 38]); |
1da177e4 LT |
245 | if ((i + 1) % 16 == 0) |
246 | str += sprintf(str, "\n"); | |
247 | } | |
2df7111f | 248 | rc = str - buf; |
34d6e075 | 249 | out: |
2df7111f KH |
250 | kfree(data); |
251 | return rc; | |
1da177e4 | 252 | } |
6659ca2a | 253 | EXPORT_SYMBOL_GPL(tpm_show_pubek); |
1da177e4 LT |
254 | |
255 | #define CAP_VER_RESULT_SIZE 18 | |
dff37e4b | 256 | static const u8 cap_version[] = { |
1da177e4 LT |
257 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
258 | 0, 0, 0, 18, /* length */ | |
259 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
260 | 0, 0, 0, 6, | |
261 | 0, 0, 0, 0 | |
262 | }; | |
263 | ||
264 | #define CAP_MANUFACTURER_RESULT_SIZE 18 | |
dff37e4b | 265 | static const u8 cap_manufacturer[] = { |
1da177e4 LT |
266 | 0, 193, /* TPM_TAG_RQU_COMMAND */ |
267 | 0, 0, 0, 22, /* length */ | |
268 | 0, 0, 0, 101, /* TPM_ORD_GetCapability */ | |
269 | 0, 0, 0, 5, | |
270 | 0, 0, 0, 4, | |
271 | 0, 0, 1, 3 | |
272 | }; | |
273 | ||
6659ca2a KH |
274 | ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr, |
275 | char *buf) | |
1da177e4 | 276 | { |
2df7111f | 277 | u8 data[sizeof(cap_manufacturer)]; |
1da177e4 LT |
278 | ssize_t len; |
279 | char *str = buf; | |
280 | ||
e659a3fe | 281 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
282 | if (chip == NULL) |
283 | return -ENODEV; | |
284 | ||
285 | memcpy(data, cap_manufacturer, sizeof(cap_manufacturer)); | |
286 | ||
287 | if ((len = tpm_transmit(chip, data, sizeof(data))) < | |
288 | CAP_MANUFACTURER_RESULT_SIZE) | |
289 | return len; | |
290 | ||
291 | str += sprintf(str, "Manufacturer: 0x%x\n", | |
81179bb6 | 292 | be32_to_cpu(*((__be32 *) (data + 14)))); |
1da177e4 LT |
293 | |
294 | memcpy(data, cap_version, sizeof(cap_version)); | |
295 | ||
296 | if ((len = tpm_transmit(chip, data, sizeof(data))) < | |
297 | CAP_VER_RESULT_SIZE) | |
298 | return len; | |
299 | ||
300 | str += | |
301 | sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
302 | (int) data[14], (int) data[15], (int) data[16], | |
303 | (int) data[17]); | |
304 | ||
305 | return str - buf; | |
306 | } | |
6659ca2a KH |
307 | EXPORT_SYMBOL_GPL(tpm_show_caps); |
308 | ||
309 | ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr, | |
310 | const char *buf, size_t count) | |
311 | { | |
312 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
313 | if (chip == NULL) | |
314 | return 0; | |
315 | ||
316 | chip->vendor->cancel(chip); | |
317 | return count; | |
318 | } | |
319 | EXPORT_SYMBOL_GPL(tpm_store_cancel); | |
1da177e4 | 320 | |
1da177e4 LT |
321 | /* |
322 | * Device file system interface to the TPM | |
323 | */ | |
324 | int tpm_open(struct inode *inode, struct file *file) | |
325 | { | |
326 | int rc = 0, minor = iminor(inode); | |
327 | struct tpm_chip *chip = NULL, *pos; | |
328 | ||
329 | spin_lock(&driver_lock); | |
330 | ||
331 | list_for_each_entry(pos, &tpm_chip_list, list) { | |
332 | if (pos->vendor->miscdev.minor == minor) { | |
333 | chip = pos; | |
334 | break; | |
335 | } | |
336 | } | |
337 | ||
338 | if (chip == NULL) { | |
339 | rc = -ENODEV; | |
340 | goto err_out; | |
341 | } | |
342 | ||
343 | if (chip->num_opens) { | |
b888c87b | 344 | dev_dbg(chip->dev, "Another process owns this TPM\n"); |
1da177e4 LT |
345 | rc = -EBUSY; |
346 | goto err_out; | |
347 | } | |
348 | ||
349 | chip->num_opens++; | |
e659a3fe | 350 | get_device(chip->dev); |
1da177e4 LT |
351 | |
352 | spin_unlock(&driver_lock); | |
353 | ||
354 | chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); | |
355 | if (chip->data_buffer == NULL) { | |
356 | chip->num_opens--; | |
e659a3fe | 357 | put_device(chip->dev); |
1da177e4 LT |
358 | return -ENOMEM; |
359 | } | |
360 | ||
361 | atomic_set(&chip->data_pending, 0); | |
362 | ||
363 | file->private_data = chip; | |
364 | return 0; | |
365 | ||
366 | err_out: | |
367 | spin_unlock(&driver_lock); | |
368 | return rc; | |
369 | } | |
1da177e4 LT |
370 | EXPORT_SYMBOL_GPL(tpm_open); |
371 | ||
372 | int tpm_release(struct inode *inode, struct file *file) | |
373 | { | |
374 | struct tpm_chip *chip = file->private_data; | |
1da177e4 LT |
375 | |
376 | spin_lock(&driver_lock); | |
5e976d55 | 377 | file->private_data = NULL; |
1da177e4 | 378 | chip->num_opens--; |
fe3fd483 | 379 | del_singleshot_timer_sync(&chip->user_read_timer); |
ba396115 | 380 | flush_scheduled_work(); |
1da177e4 | 381 | atomic_set(&chip->data_pending, 0); |
e659a3fe | 382 | put_device(chip->dev); |
5e976d55 KH |
383 | kfree(chip->data_buffer); |
384 | spin_unlock(&driver_lock); | |
1da177e4 LT |
385 | return 0; |
386 | } | |
1da177e4 LT |
387 | EXPORT_SYMBOL_GPL(tpm_release); |
388 | ||
b888c87b | 389 | ssize_t tpm_write(struct file *file, const char __user *buf, |
1da177e4 LT |
390 | size_t size, loff_t * off) |
391 | { | |
392 | struct tpm_chip *chip = file->private_data; | |
393 | int in_size = size, out_size; | |
394 | ||
395 | /* cannot perform a write until the read has cleared | |
396 | either via tpm_read or a user_read_timer timeout */ | |
700d8bdc NA |
397 | while (atomic_read(&chip->data_pending) != 0) |
398 | msleep(TPM_TIMEOUT); | |
1da177e4 LT |
399 | |
400 | down(&chip->buffer_mutex); | |
401 | ||
402 | if (in_size > TPM_BUFSIZE) | |
403 | in_size = TPM_BUFSIZE; | |
404 | ||
405 | if (copy_from_user | |
406 | (chip->data_buffer, (void __user *) buf, in_size)) { | |
407 | up(&chip->buffer_mutex); | |
408 | return -EFAULT; | |
409 | } | |
410 | ||
411 | /* atomic tpm command send and result receive */ | |
412 | out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE); | |
413 | ||
414 | atomic_set(&chip->data_pending, out_size); | |
415 | up(&chip->buffer_mutex); | |
416 | ||
417 | /* Set a timeout by which the reader must come claim the result */ | |
fe3fd483 | 418 | mod_timer(&chip->user_read_timer, jiffies + (60 * HZ)); |
1da177e4 LT |
419 | |
420 | return in_size; | |
421 | } | |
422 | ||
423 | EXPORT_SYMBOL_GPL(tpm_write); | |
424 | ||
b888c87b | 425 | ssize_t tpm_read(struct file * file, char __user *buf, |
1da177e4 LT |
426 | size_t size, loff_t * off) |
427 | { | |
428 | struct tpm_chip *chip = file->private_data; | |
5b44bd58 | 429 | int ret_size; |
1da177e4 | 430 | |
5b44bd58 | 431 | del_singleshot_timer_sync(&chip->user_read_timer); |
ba396115 | 432 | flush_scheduled_work(); |
5b44bd58 KH |
433 | ret_size = atomic_read(&chip->data_pending); |
434 | atomic_set(&chip->data_pending, 0); | |
435 | if (ret_size > 0) { /* relay data */ | |
436 | if (size < ret_size) | |
437 | ret_size = size; | |
1da177e4 LT |
438 | |
439 | down(&chip->buffer_mutex); | |
f6a2382c | 440 | if (copy_to_user(buf, chip->data_buffer, ret_size)) |
5b44bd58 | 441 | ret_size = -EFAULT; |
1da177e4 LT |
442 | up(&chip->buffer_mutex); |
443 | } | |
444 | ||
445 | return ret_size; | |
446 | } | |
1da177e4 LT |
447 | EXPORT_SYMBOL_GPL(tpm_read); |
448 | ||
e659a3fe | 449 | void tpm_remove_hardware(struct device *dev) |
1da177e4 | 450 | { |
e659a3fe | 451 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
452 | |
453 | if (chip == NULL) { | |
e659a3fe | 454 | dev_err(dev, "No device data found\n"); |
1da177e4 LT |
455 | return; |
456 | } | |
457 | ||
458 | spin_lock(&driver_lock); | |
459 | ||
460 | list_del(&chip->list); | |
461 | ||
462 | spin_unlock(&driver_lock); | |
463 | ||
e659a3fe | 464 | dev_set_drvdata(dev, NULL); |
1da177e4 | 465 | misc_deregister(&chip->vendor->miscdev); |
9a936eb9 | 466 | kfree(chip->vendor->miscdev.name); |
1da177e4 | 467 | |
e659a3fe | 468 | sysfs_remove_group(&dev->kobj, chip->vendor->attr_group); |
1da177e4 | 469 | |
b888c87b | 470 | dev_mask[chip->dev_num / TPM_NUM_MASK_ENTRIES ] &= |
f6a2382c | 471 | ~(1 << (chip->dev_num % TPM_NUM_MASK_ENTRIES)); |
1da177e4 LT |
472 | |
473 | kfree(chip); | |
474 | ||
e659a3fe | 475 | put_device(dev); |
1da177e4 | 476 | } |
e659a3fe | 477 | EXPORT_SYMBOL_GPL(tpm_remove_hardware); |
1da177e4 LT |
478 | |
479 | static u8 savestate[] = { | |
480 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
481 | 0, 0, 0, 10, /* blob length (in bytes) */ | |
482 | 0, 0, 0, 152 /* TPM_ORD_SaveState */ | |
483 | }; | |
484 | ||
485 | /* | |
486 | * We are about to suspend. Save the TPM state | |
487 | * so that it can be restored. | |
488 | */ | |
ce2c87d4 | 489 | int tpm_pm_suspend(struct device *dev, pm_message_t pm_state) |
1da177e4 | 490 | { |
ce2c87d4 | 491 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
492 | if (chip == NULL) |
493 | return -ENODEV; | |
494 | ||
495 | tpm_transmit(chip, savestate, sizeof(savestate)); | |
496 | return 0; | |
497 | } | |
1da177e4 LT |
498 | EXPORT_SYMBOL_GPL(tpm_pm_suspend); |
499 | ||
500 | /* | |
501 | * Resume from a power safe. The BIOS already restored | |
502 | * the TPM state. | |
503 | */ | |
ce2c87d4 | 504 | int tpm_pm_resume(struct device *dev) |
1da177e4 | 505 | { |
ce2c87d4 | 506 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
507 | |
508 | if (chip == NULL) | |
509 | return -ENODEV; | |
510 | ||
1da177e4 LT |
511 | return 0; |
512 | } | |
1da177e4 LT |
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 | */ | |
b888c87b | 522 | int tpm_register_hardware(struct device *dev, struct tpm_vendor_specific *entry) |
1da177e4 | 523 | { |
6f9beccb KJH |
524 | #define DEVNAME_SIZE 7 |
525 | ||
526 | char *devname; | |
1da177e4 LT |
527 | struct tpm_chip *chip; |
528 | int i, j; | |
529 | ||
530 | /* Driver specific per-device data */ | |
b888c87b | 531 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
1da177e4 LT |
532 | if (chip == NULL) |
533 | return -ENOMEM; | |
534 | ||
1da177e4 LT |
535 | init_MUTEX(&chip->buffer_mutex); |
536 | init_MUTEX(&chip->tpm_mutex); | |
1da177e4 LT |
537 | INIT_LIST_HEAD(&chip->list); |
538 | ||
09e12f9f KJH |
539 | INIT_WORK(&chip->work, timeout_work, chip); |
540 | ||
fe3fd483 KH |
541 | init_timer(&chip->user_read_timer); |
542 | chip->user_read_timer.function = user_reader_timeout; | |
543 | chip->user_read_timer.data = (unsigned long) chip; | |
544 | ||
1da177e4 LT |
545 | chip->vendor = entry; |
546 | ||
547 | chip->dev_num = -1; | |
548 | ||
3122a88a KH |
549 | for (i = 0; i < TPM_NUM_MASK_ENTRIES; i++) |
550 | for (j = 0; j < 8 * sizeof(int); j++) | |
1da177e4 | 551 | if ((dev_mask[i] & (1 << j)) == 0) { |
3122a88a KH |
552 | chip->dev_num = |
553 | i * TPM_NUM_MASK_ENTRIES + j; | |
1da177e4 LT |
554 | dev_mask[i] |= 1 << j; |
555 | goto dev_num_search_complete; | |
556 | } | |
557 | ||
558 | dev_num_search_complete: | |
559 | if (chip->dev_num < 0) { | |
b888c87b | 560 | dev_err(dev, "No available tpm device numbers\n"); |
1da177e4 LT |
561 | kfree(chip); |
562 | return -ENODEV; | |
563 | } else if (chip->dev_num == 0) | |
564 | chip->vendor->miscdev.minor = TPM_MINOR; | |
565 | else | |
566 | chip->vendor->miscdev.minor = MISC_DYNAMIC_MINOR; | |
567 | ||
6f9beccb KJH |
568 | devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL); |
569 | scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num); | |
1da177e4 LT |
570 | chip->vendor->miscdev.name = devname; |
571 | ||
e659a3fe KJH |
572 | chip->vendor->miscdev.dev = dev; |
573 | chip->dev = get_device(dev); | |
1da177e4 LT |
574 | |
575 | if (misc_register(&chip->vendor->miscdev)) { | |
e659a3fe | 576 | dev_err(chip->dev, |
1da177e4 LT |
577 | "unable to misc_register %s, minor %d\n", |
578 | chip->vendor->miscdev.name, | |
579 | chip->vendor->miscdev.minor); | |
e659a3fe | 580 | put_device(dev); |
1da177e4 LT |
581 | kfree(chip); |
582 | dev_mask[i] &= !(1 << j); | |
583 | return -ENODEV; | |
584 | } | |
585 | ||
5e976d55 KH |
586 | spin_lock(&driver_lock); |
587 | ||
e659a3fe | 588 | dev_set_drvdata(dev, chip); |
1da177e4 LT |
589 | |
590 | list_add(&chip->list, &tpm_chip_list); | |
591 | ||
5e976d55 KH |
592 | spin_unlock(&driver_lock); |
593 | ||
e659a3fe | 594 | sysfs_create_group(&dev->kobj, chip->vendor->attr_group); |
1da177e4 LT |
595 | |
596 | return 0; | |
597 | } | |
1da177e4 LT |
598 | EXPORT_SYMBOL_GPL(tpm_register_hardware); |
599 | ||
1da177e4 LT |
600 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); |
601 | MODULE_DESCRIPTION("TPM Driver"); | |
602 | MODULE_VERSION("2.0"); | |
603 | MODULE_LICENSE("GPL"); |