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>
diff --git a/include/linux/hw_random.h b/include/linux/hw_random.h
index 7244456..9bede76 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 @@
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. */