forked from Minki/linux
578b016fdc
This driver will make use of any available TPM chip on the system as a hwrng source. Acked-by: David Safford <safford@linux.vnet.ibm.com> Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/*
|
|
* Copyright (C) 2012 Kent Yoder IBM Corporation
|
|
*
|
|
* HWRNG interfaces to pull RNG data from a TPM
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/hw_random.h>
|
|
#include <linux/tpm.h>
|
|
|
|
#define MODULE_NAME "tpm-rng"
|
|
|
|
static int tpm_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
|
|
{
|
|
return tpm_get_random(TPM_ANY_NUM, data, max);
|
|
}
|
|
|
|
static struct hwrng tpm_rng = {
|
|
.name = MODULE_NAME,
|
|
.read = tpm_rng_read,
|
|
};
|
|
|
|
static int __init rng_init(void)
|
|
{
|
|
return hwrng_register(&tpm_rng);
|
|
}
|
|
module_init(rng_init);
|
|
|
|
static void __exit rng_exit(void)
|
|
{
|
|
hwrng_unregister(&tpm_rng);
|
|
}
|
|
module_exit(rng_exit);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Kent Yoder <key@linux.vnet.ibm.com>");
|
|
MODULE_DESCRIPTION("RNG driver for TPM devices");
|