2 Hardware Random Number Generator
4 Please read Documentation/hw_random.txt for details on use.
6 ----------------------------------------------------------
7 This software may be used and distributed according to the terms
8 of the GNU General Public License, incorporated herein by reference.
12 #ifndef LINUX_HWRANDOM_H_
13 #define LINUX_HWRANDOM_H_
15 #include <linux/types.h>
16 #include <linux/list.h>
19 * struct hwrng - Hardware Random Number Generator driver
20 * @name: Unique RNG name.
21 * @init: Initialization callback (can be NULL).
22 * @cleanup: Cleanup callback (can be NULL).
23 * @data_present: Callback to determine if data is available
24 * on the RNG. If NULL, it is assumed that
25 * there is always data available. *OBSOLETE*
26 * @data_read: Read data from the RNG device.
27 * Returns the number of lower random bytes in "data".
28 * Must not be NULL. *OBSOLETE*
29 * @read: New API. drivers can fill up to max bytes of data
30 * into the buffer. The buffer is aligned for any type.
31 * @priv: Private data, for use by the RNG driver.
35 int (*init
)(struct hwrng
*rng
);
36 void (*cleanup
)(struct hwrng
*rng
);
37 int (*data_present
)(struct hwrng
*rng
, int wait
);
38 int (*data_read
)(struct hwrng
*rng
, u32
*data
);
39 int (*read
)(struct hwrng
*rng
, void *data
, size_t max
, bool wait
);
43 struct list_head list
;
46 /** Register a new Hardware Random Number Generator driver. */
47 extern int hwrng_register(struct hwrng
*rng
);
48 /** Unregister a Hardware Random Number Generator driver. */
49 extern void hwrng_unregister(struct hwrng
*rng
);
51 #endif /* LINUX_HWRANDOM_H_ */
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