HID: wacom: OLEDs control over sysfs for Intuos4

Thsi patch adds ability to control OLED micro displays on Wacom Intuos4
Wireless. The OLEDS are exposed as
/sys/class/hidraw/hidraw*/device/oled{No]_img
where No. is 0 to 7

Setting an image:

dd bs=256 if=img_file of=/sys/class/hidraw/hidraw{No}/device/oled0_img

The image has to contain 256 bytes (64x32px 1 bit). More detailed
description in Documentation/ABI/testing/sysfs-driver-wacom

Signed-off-by: Przemo Firszt <przemo@firszt.eu>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 13 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-driver-wacom b/Documentation/ABI/testing/sysfs-driver-wacom
index 8d55a83d6921..7fc781048b79 100644
--- a/Documentation/ABI/testing/sysfs-driver-wacom
+++ b/Documentation/ABI/testing/sysfs-driver-wacom
@@ -1,3 +1,16 @@
+WWhat:          /sys/class/hidraw/hidraw*/device/oled*_img
+Date:           June 2012
+Contact:        linux-bluetooth@vger.kernel.org
+Description:
+                The /sys/class/hidraw/hidraw*/device/oled*_img files control
+                OLED mocro displays on Intuos4 Wireless tablet. Accepted image
+                has to contain 256 bytes (64x32 px 1 bit colour). The format
+                is the same as PBM image 62x32px without header (64 bits per
+                horizontal line, 32 lines). An example of setting OLED No. 0:
+                dd bs=256 count=1 if=img_file of=[path to oled0_img]/oled0_img
+                The attribute is read only and no local copy of the image is
+                stored.
+
 What:           /sys/class/hidraw/hidraw*/device/speed
 Date:           April 2010
 Kernel Version: 2.6.35