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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef LINUX_HWRANDOM_H_
#define LINUX_HWRANDOM_H_
#include <linux/list.h>
#include <driver.h>
/**
* struct hwrng - Hardware Random Number Generator driver
* @name: Unique RNG name.
* @init: Initialization callback (can be NULL).
* @read: New API. drivers can fill up to max bytes of data
* into the buffer. The buffer is aligned for any type.
*/
struct hwrng {
const char *name;
int (*init)(struct hwrng *rng);
int (*read)(struct hwrng *rng, void *data, size_t max, bool wait);
struct list_head list;
struct cdev cdev;
struct device *dev;
void *buf;
unsigned long priv;
};
/* Register a new Hardware Random Number Generator driver. */
int hwrng_register(struct device *dev, struct hwrng *rng);
#ifdef CONFIG_HWRNG
struct hwrng *hwrng_get_first(void);
int hwrng_get_data(struct hwrng *rng, void *buffer, size_t size, int wait);
#else
static inline struct hwrng *hwrng_get_first(void) { return ERR_PTR(-ENODEV); };
static inline int hwrng_get_data(struct hwrng *rng, void *buffer, size_t size, int wait)
{
return -ENODEV;
}
#endif
void hwrng_unregister(struct hwrng *rng);
static inline long hwrng_yield(struct hwrng *rng)
{
return 0;
}
#endif /* LINUX_HWRANDOM_H_ */
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