UIO: Implement a UIO interface for the SMX Cryptengine

This patch implements a UIO interface for the SMX Cryptengine.

The Cryptengine found on the Nias Digital SMX board is best suited
for a UIO interface.  It is not wired in to the cryptographic API
as the engine handles it's own keys, algorithms, everything.  All
that we know about is that if there's room in the buffer, you can
write data to it and when there's data ready, you read it out again.

There isn't necessarily even any direct correlation between data
going in and data coming out again, the engine may consume or
generate data all on its own.

This driver is for proprietary hardware but we're always told to
submit the drivers anyway; here you are.  :-)

This is version 4 of this patch and addresses all issues raised by
Hans-Jürgen Koch and Paul Mundt in their reviews.  Slightly altered
is Paul's suggestion to use DRV_NAME and DRV_VERSION as the UIO
version and name.  While at the moment they are the same, there
is no reason for them to stay that way.  Nevertheless we now at
least provide a MODULE_VERSION macro to keep modinfo happy.

Signed-off-by: Ben Nizette <bn@niasdigital.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Hans J Koch <hjk@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
index d8ab7e668bd2..a4aaab9c7ddc 100644
--- a/drivers/uio/Kconfig
+++ b/drivers/uio/Kconfig
@@ -26,4 +26,17 @@ config UIO_CIF
           To compile this driver as a module, choose M here: the module
           will be called uio_cif.
 
+config UIO_SMX
+        tristate "SMX cryptengine UIO interface"
+        depends on UIO
+        default n
+        help
+          Userspace IO interface to the Cryptography engine found on the
+          Nias Digital SMX boards.  These will be available from Q4 2008
+          from http://www.niasdigital.com.  The userspace part of this
+          driver will be released under the GPL at the same time as the
+          hardware and will be able to be downloaded from the same site.
+
+          If you compile this as a module, it will be called uio_smx.
+
 endif