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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970/* Hardware Random Number Generator
Please read Documentation/admin-guide/hw_random.rst 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/kref.h>#include <linux/types.h>#include <linux/workqueue_types.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 * and max is a multiple of 4 and >= 32 bytes. * @priv: Private data, for use by the RNG driver. * @quality: Estimation of true entropy in RNG's bitstream * (in bits of entropy per 1024 bits of input; * valid values: 1 to 1024, or 0 for maximum). */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;
/* private: internal. */ struct list_head list; struct kref ref; struct work_struct cleanup_work; struct completion cleanup_done; struct completion dying;};
struct device;
/** Register a new Hardware Random Number Generator driver. */extern int hwrng_register(struct hwrng *rng);extern int devm_hwrng_register(struct device *dev, struct hwrng *rng);/** Unregister a Hardware Random Number Generator driver. */extern void hwrng_unregister(struct hwrng *rng);extern void devm_hwrng_unregister(struct device *dve, struct hwrng *rng);
extern long hwrng_msleep(struct hwrng *rng, unsigned int msecs);extern long hwrng_yield(struct hwrng *rng);
#endif /* LINUX_HWRANDOM_H_ */