HID: wiimote: Add extension sysfs attribute

Add new sysfs attribute "extension" which returns the currently connected and
initialized extensions.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 12 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-driver-hid-wiimote b/Documentation/ABI/testing/sysfs-driver-hid-wiimote
index 5d5a16ea57c..3d98009f447 100644
--- a/Documentation/ABI/testing/sysfs-driver-hid-wiimote
+++ b/Documentation/ABI/testing/sysfs-driver-hid-wiimote
@@ -8,3 +8,15 @@ Contact:	David Herrmann <dh.herrmann@googlemail.com>
 Description:    Make it possible to set/get current led state. Reading from it
                 returns 0 if led is off and 1 if it is on. Writing 0 to it
                 disables the led, writing 1 enables it.
+
+What:           /sys/bus/hid/drivers/wiimote/<dev>/extension
+Date:           August 2011
+KernelVersion:  3.2
+Contact:        David Herrmann <dh.herrmann@googlemail.com>
+Description:    This file contains the currently connected and initialized
+                extensions. It can be one of: none, motionp, nunchuck, classic,
+                motionp+nunchuck, motionp+classic
+                motionp is the official Nintendo Motion+ extension, nunchuck is
+                the official Nintendo Nunchuck extension and classic is the
+                Nintendo Classic Controller extension. The motionp extension can
+                be combined with the other two.