UIO: Add the User IO core code

This interface allows the ability to write the majority of a driver in
userspace with only a very small shell of a driver in the kernel itself.
It uses a char device and sysfs to interact with a userspace process to
process interrupts and control memory accesses.

See the docbook documentation for more details on how to use this
interface.

From: Hans J. Koch <hjk@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Benedikt Spranger <b.spranger@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
new file mode 100644
index 00000000000..6b1a62d45e4
--- /dev/null
+++ b/drivers/uio/Kconfig
@@ -0,0 +1,16 @@
+menu "Userspace I/O"
+        depends on !S390
+
+config UIO
+        tristate "Userspace I/O drivers"
+        default n
+        help
+          Enable this to allow the userspace driver core code to be
+          built.  This code allows userspace programs easy access to
+          kernel interrupts and memory locations, allowing some drivers
+          to be written in userspace.  Note that a small kernel driver
+          is also required for interrupt handling to work properly.
+
+          If you don't know what to do here, say N.
+
+endmenu