Input: wacom - add LED support for Cintiq 21ux2

Cintiq 21ux2 has two sets of four LEDs on right and left side of
the tablet, respectively.

Reviewed-by: Eduard Hasenleithner <eduard@hasenleithner.at>
Tested-by: Eduard Hasenleithner <eduard@hasenleithner.at>
Signed-off-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 16 insertions, 7 deletions

diff --git a/Documentation/ABI/testing/sysfs-driver-wacom b/Documentation/ABI/testing/sysfs-driver-wacom
index b5601859de5a..82d4df136444 100644
--- a/Documentation/ABI/testing/sysfs-driver-wacom
+++ b/Documentation/ABI/testing/sysfs-driver-wacom
@@ -13,11 +13,11 @@ What:		/sys/bus/usb/devices/<busnum>-<devnum>:<cfg>.<intf>/wacom_led/led
 Date:           August 2011
 Contact:        linux-input@vger.kernel.org
 Description:
-                Attribute group for control of the status LEDs and the OLED
-                displays found on the Wacom Intuos 4 M, L, and XL tablets. This
-                attribute group is not available for other Wacom tablets.
+                Attribute group for control of the status LEDs and the OLEDs.
+                This attribute group is only available for Intuos 4 M, L,
+                and XL (with LEDs and OLEDs) and Cintiq 21UX2 (LEDs only).
                 Therefore its presence implicitly signifies the presence of
-                said LEDs and OLED displays on the tablet device.
+                said LEDs and OLEDs on the tablet device.
 
 What:           /sys/bus/usb/devices/<busnum>-<devnum>:<cfg>.<intf>/wacom_led/status0_luminance
 Date:           August 2011
@@ -36,12 +36,21 @@ Description:
                 when the stylus touches the tablet surface, or any button is
                 pressed on the stylus.
 
-What:           /sys/bus/usb/devices/<busnum>-<devnum>:<cfg>.<intf>/wacom_led/status_led_select
+What:           /sys/bus/usb/devices/<busnum>-<devnum>:<cfg>.<intf>/wacom_led/status_led0_select
 Date:           August 2011
 Contact:        linux-input@vger.kernel.org
 Description:
-                Writing to this file sets which one of the four status LEDs is
-                active (0..3). The other three LEDs are always inactive.
+                Writing to this file sets which one of the four (for Intuos 4)
+                or of the right four (for Cintiq 21UX2) status LEDs is active (0..3).
+                The other three LEDs on the same side are always inactive.
+
+What:           /sys/bus/usb/devices/<busnum>-<devnum>:<cfg>.<intf>/wacom_led/status_led1_select
+Date:           September 2011
+Contact:        linux-input@vger.kernel.org
+Description:
+                Writing to this file sets which one of the left four (for Cintiq 21UX2)
+                status LEDs is active (0..3). The other three LEDs on the left are always
+                inactive.
 
 What:           /sys/bus/usb/devices/<busnum>-<devnum>:<cfg>.<intf>/wacom_led/buttons_luminance
 Date:           August 2011