HID: roccat: added sensor sysfs attribute for Savu

The sensor attr can be used to tweak the optical sensor of the Savu.

Signed-off-by: Stefan Achatz <erazor_de@users.sourceforge.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-roccat-savu.c b/drivers/hid/hid-roccat-savu.c
index 29e87d7..014afba 100644
--- a/drivers/hid/hid-roccat-savu.c
+++ b/drivers/hid/hid-roccat-savu.c
@@ -121,6 +121,7 @@
 SAVU_SYSFS_RW(buttons, BUTTONS)
 SAVU_SYSFS_RW(macro, MACRO)
 SAVU_SYSFS_R(info, INFO)
+SAVU_SYSFS_RW(sensor, SENSOR)
 
 static struct bin_attribute savu_bin_attributes[] = {
 	SAVU_BIN_ATTRIBUTE_W(control, CONTROL),
@@ -129,6 +130,7 @@
 	SAVU_BIN_ATTRIBUTE_RW(buttons, BUTTONS),
 	SAVU_BIN_ATTRIBUTE_RW(macro, MACRO),
 	SAVU_BIN_ATTRIBUTE_R(info, INFO),
+	SAVU_BIN_ATTRIBUTE_RW(sensor, SENSOR),
 	__ATTR_NULL
 };