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/*

        Hardware Random Number Generator

        Please read Documentation/hw_random.txt for details on use.

        ----------------------------------------------------------

        This software may be used and distributed according to the terms

        of the GNU General Public License, incorporated herein by reference.

 */

#ifndef LINUX_HWRANDOM_H_

#define LINUX_HWRANDOM_H_

#ifdef __KERNEL__

#include <linux/types.h>

#include <linux/list.h>

/**

 * struct hwrng - Hardware Random Number Generator driver

 * @name:               Unique RNG name.

 * @init:               Initialization callback (can be NULL).

 * @cleanup:            Cleanup callback (can be NULL).

 * @data_present:       Callback to determine if data is available

 *                      on the RNG. If NULL, it is assumed that

 *                      there is always data available.

 * @data_read:          Read data from the RNG device.

 *                      Returns the number of lower random bytes in "data".

 *                      Must not be NULL.

 * @priv:               Private data, for use by the RNG driver.

 */

struct hwrng {

        const char *name;

        int (*init)(struct hwrng *rng);

        void (*cleanup)(struct hwrng *rng);

        int (*data_present)(struct hwrng *rng);

        int (*data_read)(struct hwrng *rng, u32 *data);

        unsigned long priv;

        /* internal. */

        struct list_head list;

};

/** Register a new Hardware Random Number Generator driver. */

extern int hwrng_register(struct hwrng *rng);

/** Unregister a Hardware Random Number Generator driver. */

extern void hwrng_unregister(struct hwrng *rng);

#endif /* __KERNEL__ */

#endif /* LINUX_HWRANDOM_H_ */