Linux kernel mirror (for testing)
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1/*
2 Hardware Random Number Generator
3
4 Please read Documentation/hw_random.txt for details on use.
5
6 ----------------------------------------------------------
7 This software may be used and distributed according to the terms
8 of the GNU General Public License, incorporated herein by reference.
9
10 */
11
12#ifndef LINUX_HWRANDOM_H_
13#define LINUX_HWRANDOM_H_
14#ifdef __KERNEL__
15
16#include <linux/types.h>
17#include <linux/list.h>
18
19/**
20 * struct hwrng - Hardware Random Number Generator driver
21 * @name: Unique RNG name.
22 * @init: Initialization callback (can be NULL).
23 * @cleanup: Cleanup callback (can be NULL).
24 * @data_present: Callback to determine if data is available
25 * on the RNG. If NULL, it is assumed that
26 * there is always data available.
27 * @data_read: Read data from the RNG device.
28 * Returns the number of lower random bytes in "data".
29 * Must not be NULL.
30 * @priv: Private data, for use by the RNG driver.
31 */
32struct hwrng {
33 const char *name;
34 int (*init)(struct hwrng *rng);
35 void (*cleanup)(struct hwrng *rng);
36 int (*data_present)(struct hwrng *rng);
37 int (*data_read)(struct hwrng *rng, u32 *data);
38 unsigned long priv;
39
40 /* internal. */
41 struct list_head list;
42};
43
44/** Register a new Hardware Random Number Generator driver. */
45extern int hwrng_register(struct hwrng *rng);
46/** Unregister a Hardware Random Number Generator driver. */
47extern void hwrng_unregister(struct hwrng *rng);
48
49#endif /* __KERNEL__ */
50#endif /* LINUX_HWRANDOM_H_ */