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.
26 * @data_read: Read data from the RNG device.
27 * Returns the number of lower random bytes in "data".
29 * @priv: Private data, for use by the RNG driver.
33 int (*init)(struct hwrng *rng);
34 void (*cleanup)(struct hwrng *rng);
35 int (*data_present)(struct hwrng *rng, int wait);
36 int (*data_read)(struct hwrng *rng, u32 *data);
40 struct list_head list;
43 /** Register a new Hardware Random Number Generator driver. */
44 extern int hwrng_register(struct hwrng *rng);
45 /** Unregister a Hardware Random Number Generator driver. */
46 extern void hwrng_unregister(struct hwrng *rng);
48 #endif /* LINUX_HWRANDOM_H_ */