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578b016f KY |
1 | /* |
2 | * Copyright (C) 2012 Kent Yoder IBM Corporation | |
3 | * | |
4 | * HWRNG interfaces to pull RNG data from a TPM | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/hw_random.h> | |
22 | #include <linux/tpm.h> | |
23 | ||
24 | #define MODULE_NAME "tpm-rng" | |
25 | ||
26 | static int tpm_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) | |
27 | { | |
28 | return tpm_get_random(TPM_ANY_NUM, data, max); | |
29 | } | |
30 | ||
31 | static struct hwrng tpm_rng = { | |
32 | .name = MODULE_NAME, | |
33 | .read = tpm_rng_read, | |
34 | }; | |
35 | ||
36 | static int __init rng_init(void) | |
37 | { | |
38 | return hwrng_register(&tpm_rng); | |
39 | } | |
40 | module_init(rng_init); | |
41 | ||
42 | static void __exit rng_exit(void) | |
43 | { | |
44 | hwrng_unregister(&tpm_rng); | |
45 | } | |
46 | module_exit(rng_exit); | |
47 | ||
48 | MODULE_LICENSE("GPL v2"); | |
49 | MODULE_AUTHOR("Kent Yoder <key@linux.vnet.ibm.com>"); | |
50 | MODULE_DESCRIPTION("RNG driver for TPM devices"); |