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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_ */
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