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| 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"); |
| 51 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9
