[media] media: rc: document rc class sysfs API

Briefly document /sys/class/rc/ API for remote controller devices in
Documentation/ABI/teting.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Rob Landley <rob@landley.net>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-class-rc b/Documentation/ABI/testing/sysfs-class-rc
new file mode 100644
index 000000000000..52bc057b5d06
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-rc
@@ -0,0 +1,34 @@
+What:           /sys/class/rc/
+Date:           Apr 2010
+KernelVersion:  2.6.35
+Contact:        Mauro Carvalho Chehab <m.chehab@samsung.com>
+Description:
+                The rc/ class sub-directory belongs to the Remote Controller
+                core and provides a sysfs interface for configuring infrared
+                remote controller receivers.
+
+What:           /sys/class/rc/rcN/
+Date:           Apr 2010
+KernelVersion:  2.6.35
+Contact:        Mauro Carvalho Chehab <m.chehab@samsung.com>
+Description:
+                A /sys/class/rc/rcN directory is created for each remote
+                control receiver device where N is the number of the receiver.
+
+What:           /sys/class/rc/rcN/protocols
+Date:           Jun 2010
+KernelVersion:  2.6.36
+Contact:        Mauro Carvalho Chehab <m.chehab@samsung.com>
+Description:
+                Reading this file returns a list of available protocols,
+                something like:
+                    "rc5 [rc6] nec jvc [sony]"
+                Enabled protocols are shown in [] brackets.
+                Writing "+proto" will add a protocol to the list of enabled
+                protocols.
+                Writing "-proto" will remove a protocol from the list of enabled
+                protocols.
+                Writing "proto" will enable only "proto".
+                Writing "none" will disable all protocols.
+                Write fails with EINVAL if an invalid protocol combination or
+                unknown protocol name is used.