summaryrefslogblamecommitdiffstats
path: root/include/linux/hw_random.h
blob: bee0827766a397d6d5ff3a2f8cdf42b97925f3c8 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
12
13












                                                                            
 
                             

                        
                       







                                                                  
                                                                   

                                                                           
                                                       
                                                                         
                                                                           
                                                                   
                                                                

                                                                     




                                           
                                                         
                                                       
                                                                          
                           
                               


                              
                        
                                       

  

              

                                                              
                                                                      
                                                            
                                                
                                                                         

                                                                                         
 
                              
/*
	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
 *			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
 *			(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;
};

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);
/** Feed random bits into the pool. */
extern void add_hwgenerator_randomness(const char *buffer, size_t count, size_t entropy);

#endif /* LINUX_HWRANDOM_H_ */