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+What: /sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/speed
+Date: April 2010
+Kernel Version: 2.6.35
+Contact: linux-bluetooth@vger.kernel.org
+Description:
+ The /sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/speed file
+ controls reporting speed of Wacom bluetooth tablet. Reading
+ from this file returns 1 if tablet reports in high speed mode
+ or 0 otherwise. Writing to this file one of these values
+ switches reporting speed.
+
+What: /sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_led/led
+Date: August 2014
+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), Intuos 4 WL, Intuos 5 (LEDs only),
+ Intuos Pro (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/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_led/status0_luminance
+Date: August 2014
+Contact: linux-input@vger.kernel.org
+Description:
+ Writing to this file sets the status LED luminance (1..127)
+ when the stylus does not touch the tablet surface, and no
+ button is pressed on the stylus. This luminance level is
+ normally lower than the level when a button is pressed.
+
+What: /sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_led/status1_luminance
+Date: August 2014
+Contact: linux-input@vger.kernel.org
+Description:
+ Writing to this file sets the status LED luminance (1..127)
+ when the stylus touches the tablet surface, or any button is
+ pressed on the stylus.
+
+What: /sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_led/status_led0_select
+Date: August 2014
+Contact: linux-input@vger.kernel.org
+Description:
+ 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/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_led/status_led1_select
+Date: August 2014
+Contact: linux-input@vger.kernel.org
+Description:
+ Writing to this file sets which one of the left four (for Cintiq 21UX2
+ and Cintiq 24HD) status LEDs is active (0..3). The other three LEDs on
+ the left are always inactive.
+
+What: /sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_led/buttons_luminance
+Date: August 2014
+Contact: linux-input@vger.kernel.org
+Description:
+ Writing to this file sets the overall luminance level (0..15)
+ of all eight button OLED displays.
+
+What: /sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_led/button<n>_rawimg
+Date: August 2014
+Contact: linux-input@vger.kernel.org
+Description:
+ When writing a 1024 byte raw image in Wacom Intuos 4
+ interleaving format to the file, the image shows up on Button N
+ of the device. The image is a 64x32 pixel 4-bit gray image. The
+ 1024 byte binary is split up into 16x 64 byte chunks. Each 64
+ byte chunk encodes the image data for two consecutive lines on
+ the display. The low nibble of each byte contains the first
+ line, and the high nibble contains the second line.
+ When the Wacom Intuos 4 is connected over Bluetooth, the
+ image has to contain 256 bytes (64x32 px 1 bit colour).
+ The format is also scrambled, like in the USB mode, and it can
+ be summarized by converting 76543210 into GECA6420.
+ HGFEDCBA HFDB7531