From: Hans J. Koch <hjk@linutronix.de>

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>
---
 drivers/Kconfig            |    1 +
 drivers/Makefile           |    1 +
 drivers/uio/Kconfig        |   14 +
 drivers/uio/Makefile       |    1 +
 drivers/uio/uio.c          |  701 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/uio_driver.h |   91 ++++++
 6 files changed, 809 insertions(+), 0 deletions(-)
 create mode 100644 drivers/uio/Kconfig
 create mode 100644 drivers/uio/Makefile
 create mode 100644 drivers/uio/uio.c
 create mode 100644 include/linux/uio_driver.h

diff --git a/drivers/Kconfig b/drivers/Kconfig
index 050323f..325a108 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -84,4 +84,5 @@ source "drivers/auxdisplay/Kconfig"
 
 source "drivers/kvm/Kconfig"
 
+source "drivers/uio/Kconfig"
 endmenu
diff --git a/drivers/Makefile b/drivers/Makefile
index 26ca903..1e2974c 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_SCSI)		+= scsi/
 obj-$(CONFIG_ATA)		+= ata/
 obj-$(CONFIG_FUSION)		+= message/
 obj-$(CONFIG_IEEE1394)		+= ieee1394/
+obj-$(CONFIG_UIO)		+= uio/
 obj-y				+= cdrom/
 obj-y				+= auxdisplay/
 obj-$(CONFIG_MTD)		+= mtd/
diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
new file mode 100644
index 0000000..8fcef21
--- /dev/null
+++ b/drivers/uio/Kconfig
@@ -0,0 +1,14 @@
+menu "Userspace I/O"
+config UIO
+	tristate "Userspace I/O drivers"
+	default n
+	help
+	  Enable this to allow the userspace driver core code to ...
[ message continues ]

From: Hans J. Koch <hjk@linutronix.de>

Documentation for the UIO interface

From: Hans J. Koch <hjk@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 Documentation/DocBook/kernel-api.tmpl |    4 +
 Documentation/DocBook/uio-howto.tmpl  |  611 +++++++++++++++++++++++++++++++++
 2 files changed, 615 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/DocBook/uio-howto.tmpl

diff --git a/Documentation/DocBook/kernel-api.tmpl b/Documentation/DocBook/kernel-api.tmpl
index b61dfc7..4b7b2fd 100644
--- a/Documentation/DocBook/kernel-api.tmpl
+++ b/Documentation/DocBook/kernel-api.tmpl
@@ -402,6 +402,10 @@ X!Edrivers/pnp/system.c
 !Edrivers/pnp/manager.c
 !Edrivers/pnp/support.c
      </sect1>
+     <sect1><title>Userspace IO devices</title>
+!Edrivers/uio/uio.c
+!Iinclude/linux/uio_driver.h
+     </sect1>
   </chapter>
 
   <chapter id="blkdev">
diff --git a/Documentation/DocBook/uio-howto.tmpl b/Documentation/DocBook/uio-howto.tmpl
new file mode 100644
index 0000000..e3bb29a
--- /dev/null
+++ b/Documentation/DocBook/uio-howto.tmpl
@@ -0,0 +1,611 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" []>
+
+<book id="index">
+<bookinfo>
+<title>The Userspace I/O HOWTO</title>
+
+<author>
+      <firstname>Hans-J
[ message continues ]

From: Hans-J
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