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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_ | |
844dd05f | 14 | |
77584ee5 | 15 | #include <linux/completion.h> |
844dd05f MB |
16 | #include <linux/types.h> |
17 | #include <linux/list.h> | |
3a2c0ba5 | 18 | #include <linux/kref.h> |
844dd05f MB |
19 | |
20 | /** | |
21 | * struct hwrng - Hardware Random Number Generator driver | |
22 | * @name: Unique RNG name. | |
23 | * @init: Initialization callback (can be NULL). | |
24 | * @cleanup: Cleanup callback (can be NULL). | |
25 | * @data_present: Callback to determine if data is available | |
26 | * on the RNG. If NULL, it is assumed that | |
9996508b | 27 | * there is always data available. *OBSOLETE* |
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28 | * @data_read: Read data from the RNG device. |
29 | * Returns the number of lower random bytes in "data". | |
988acec9 | 30 | * Must not be NULL. *OBSOLETE* |
9996508b | 31 | * @read: New API. drivers can fill up to max bytes of data |
ed0bd721 | 32 | * into the buffer. The buffer is aligned for any type |
ed424bb3 | 33 | * and max is a multiple of 4 and >= 32 bytes. |
844dd05f | 34 | * @priv: Private data, for use by the RNG driver. |
0f734e6e | 35 | * @quality: Estimation of true entropy in RNG's bitstream |
fae29f13 MT |
36 | * (in bits of entropy per 1024 bits of input; |
37 | * valid values: 1 to 1024, or 0 for unknown). | |
844dd05f MB |
38 | */ |
39 | struct hwrng { | |
40 | const char *name; | |
41 | int (*init)(struct hwrng *rng); | |
42 | void (*cleanup)(struct hwrng *rng); | |
984e976f | 43 | int (*data_present)(struct hwrng *rng, int wait); |
844dd05f | 44 | int (*data_read)(struct hwrng *rng, u32 *data); |
9996508b | 45 | int (*read)(struct hwrng *rng, void *data, size_t max, bool wait); |
844dd05f | 46 | unsigned long priv; |
0f734e6e | 47 | unsigned short quality; |
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48 | |
49 | /* internal. */ | |
50 | struct list_head list; | |
3a2c0ba5 | 51 | struct kref ref; |
77584ee5 | 52 | struct completion cleanup_done; |
844dd05f MB |
53 | }; |
54 | ||
4d9b519c DT |
55 | struct device; |
56 | ||
844dd05f MB |
57 | /** Register a new Hardware Random Number Generator driver. */ |
58 | extern int hwrng_register(struct hwrng *rng); | |
4d9b519c | 59 | extern int devm_hwrng_register(struct device *dev, struct hwrng *rng); |
844dd05f | 60 | /** Unregister a Hardware Random Number Generator driver. */ |
b844eba2 | 61 | extern void hwrng_unregister(struct hwrng *rng); |
4d9b519c | 62 | extern void devm_hwrng_unregister(struct device *dve, struct hwrng *rng); |
c84dbf61 TD |
63 | /** Feed random bits into the pool. */ |
64 | extern void add_hwgenerator_randomness(const char *buffer, size_t count, size_t entropy); | |
844dd05f | 65 | |
844dd05f | 66 | #endif /* LINUX_HWRANDOM_H_ */ |