linux/include/linux/hw_random.h
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   1/*
   2        Hardware Random Number Generator
   3
   4        Please read Documentation/hw_random.txt for details on use.
   5
   6        ----------------------------------------------------------
   7        This software may be used and distributed according to the terms
   8        of the GNU General Public License, incorporated herein by reference.
   9
  10 */
  11
  12#ifndef LINUX_HWRANDOM_H_
  13#define LINUX_HWRANDOM_H_
  14
  15#include <linux/types.h>
  16#include <linux/list.h>
  17
  18/**
  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.  *OBSOLETE*
  26 * @data_read:          Read data from the RNG device.
  27 *                      Returns the number of lower random bytes in "data".
  28 *                      Must not be NULL.    *OBSOLETE*
  29 * @read:               New API. drivers can fill up to max bytes of data
  30 *                      into the buffer. The buffer is aligned for any type.
  31 * @priv:               Private data, for use by the RNG driver.
  32 */
  33struct hwrng {
  34        const char *name;
  35        int (*init)(struct hwrng *rng);
  36        void (*cleanup)(struct hwrng *rng);
  37        int (*data_present)(struct hwrng *rng, int wait);
  38        int (*data_read)(struct hwrng *rng, u32 *data);
  39        int (*read)(struct hwrng *rng, void *data, size_t max, bool wait);
  40        unsigned long priv;
  41
  42        /* internal. */
  43        struct list_head list;
  44};
  45
  46/** Register a new Hardware Random Number Generator driver. */
  47extern int hwrng_register(struct hwrng *rng);
  48/** Unregister a Hardware Random Number Generator driver. */
  49extern void hwrng_unregister(struct hwrng *rng);
  50
  51#endif /* LINUX_HWRANDOM_H_ */
  52
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