diff options
| author | Ian Molton <ian.molton@collabora.co.uk> | 2009-12-01 14:47:32 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2009-12-01 14:47:32 +0800 |
| commit | 9996508b3353063f2d6c48c1a28a84543d72d70b (patch) | |
| tree | 4358f990cf7805caee70be90953b4d267aad5461 /include/linux/hw_random.h | |
| parent | 2f32bfd834d5d7eb230bcbf39aaacccd2a01d767 (diff) | |
| download | lwn-9996508b3353063f2d6c48c1a28a84543d72d70b.tar.gz lwn-9996508b3353063f2d6c48c1a28a84543d72d70b.zip | |
hwrng: core - Replace u32 in driver API with byte array
This patch implements a new method by which hw_random hardware drivers
can pass data to the core more efficiently, using a shared buffer.
The old methods have been retained as a compatability layer until all the
drivers have been updated.
Signed-off-by: Ian Molton <ian.molton@collabora.co.uk>
Acked-by: Matt Mackall <mpm@selenic.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/linux/hw_random.h')
| -rw-r--r-- | include/linux/hw_random.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/include/linux/hw_random.h b/include/linux/hw_random.h index 7244456e7e65..9bede7633f74 100644 --- a/include/linux/hw_random.h +++ b/include/linux/hw_random.h @@ -22,10 +22,12 @@ * @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. + * 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. + * Must not be NULL. *OSOLETE* + * @read: New API. drivers can fill up to max bytes of data + * into the buffer. The buffer is aligned for any type. * @priv: Private data, for use by the RNG driver. */ struct hwrng { @@ -34,6 +36,7 @@ struct hwrng { 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; /* internal. */ |