Edit File: hw_random.h
/* 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_ #include <linux/completion.h> #include <linux/types.h> #include <linux/list.h> #include <linux/kref.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. *OBSOLETE* * @data_read: Read data from the RNG device. * Returns the number of lower random bytes in "data". * Must not be NULL. *OBSOLETE* * @read: New API. drivers can fill up to max bytes of data * into the buffer. The buffer is aligned for any type. * @priv: Private data, for use by the RNG driver. * @quality: Estimation of true entropy in RNG's bitstream * (per mill). */ struct hwrng { const char *name; int (*init)(struct hwrng *rng); void (*cleanup)(struct hwrng *rng); int (*data_present)(struct hwrng *rng, int wait); int (*data_read)(struct hwrng *rng, u32 *data); int (*read)(struct hwrng *rng, void *data, size_t max, bool wait); unsigned long priv; unsigned short quality; /* internal. */ struct list_head list; struct kref ref; struct completion cleanup_done; }; /** 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); /** Feed random bits into the pool. */ extern void add_hwgenerator_randomness(const char *buffer, size_t count, size_t entropy); #endif /* LINUX_HWRANDOM_H_ */