[PATCH] Add new generic HW RNG core

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 50 insertions, 0 deletions

diff --git a/include/linux/hw_random.h b/include/linux/hw_random.h
new file mode 100644
index 000000000000..21ea7610e177
--- /dev/null
+++ b/include/linux/hw_random.h
@@ -0,0 +1,50 @@
+/*
+        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_
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <linux/list.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.
+ * @data_read:          Read data from the RNG device.
+ *                      Returns the number of lower random bytes in "data".
+ *                      Must not be NULL.
+ * @priv:               Private data, for use by the RNG driver.
+ */
+struct hwrng {
+        const char *name;
+        int (*init)(struct hwrng *rng);
+        void (*cleanup)(struct hwrng *rng);
+        int (*data_present)(struct hwrng *rng);
+        int (*data_read)(struct hwrng *rng, u32 *data);
+        unsigned long priv;
+
+        /* internal. */
+        struct list_head list;
+};
+
+/** Register a new Hardware Random Number Generator driver. */
+extern int hwrng_register(struct hwrng *rng);
+/** Unregister a Hardware Random Number Generator driver. */
+extern void hwrng_unregister(struct hwrng *rng);
+
+#endif /* __KERNEL__ */
+#endif /* LINUX_HWRANDOM_H_ */