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authorMichael Buesch <mb@bu3sch.de>2006-06-26 00:24:59 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:19 -0700
commit844dd05fec172d98b0dacecd9b9e9f6595204c13 (patch)
treea62ebcbd314ed4be35c233eb6a5eba414493a50f /include/linux/hw_random.h
parent59f5d35f83738bf07e66f8cdcff32a433df804a3 (diff)
[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>
Diffstat (limited to 'include/linux/hw_random.h')
-rw-r--r--include/linux/hw_random.h50
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_ */