Input: wacom - add Intuos5 Touch Ring LED support

The Touch Ring LEDs on Intuos5 tablets use a different report
format which supports only 4 levels of brightness. We remap
the 7-bit value obtained from sysfs to an appropriate value
for the tablet. Control of the crop mark LEDs (new to the I5)
is left for a later patch.

Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Reviewed-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 8 insertions, 7 deletions

diff --git a/Documentation/ABI/testing/sysfs-driver-wacom b/Documentation/ABI/testing/sysfs-driver-wacom
index 0130d6683c14..5e9cbdc7486e 100644
--- a/Documentation/ABI/testing/sysfs-driver-wacom
+++ b/Documentation/ABI/testing/sysfs-driver-wacom
@@ -15,9 +15,10 @@ Contact:	linux-input@vger.kernel.org
 Description:
                 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 and Cintiq 24HD
-                (LEDs only). Therefore its presence implicitly signifies the
-                presence of said LEDs and OLEDs on the tablet device.
+                and XL (with LEDs and OLEDs), Intuos 5 (LEDs only), and Cintiq
+                21UX2 and Cintiq 24HD (LEDs only). Therefore its presence
+                implicitly signifies the presence of said LEDs and OLEDs on the
+                tablet device.
 
 What:           /sys/bus/usb/devices/<busnum>-<devnum>:<cfg>.<intf>/wacom_led/status0_luminance
 Date:           August 2011
@@ -40,10 +41,10 @@ What:		/sys/bus/usb/devices/<busnum>-<devnum>:<cfg>.<intf>/wacom_led/status_led0
 Date:           August 2011
 Contact:        linux-input@vger.kernel.org
 Description:
-                Writing to this file sets which one of the four (for Intuos 4)
-                or of the right four (for Cintiq 21UX2 and Cintiq 24HD) status
-                LEDs is active (0..3). The other three LEDs on the same side are
-                always inactive.
+                Writing to this file sets which one of the four (for Intuos 4
+                and Intuos 5) or of the right four (for Cintiq 21UX2 and Cintiq
+                24HD) 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