Input: wacom - add Intuos4 LED and OLED control

This commit enables control of the LEDs and OLED displays found on the
Wacom Intuos4 M, L, and XL. For this purpose, a new "wacom_led" attribute
group is added to the sysfs entry of the USB device.

This "wacom_led" group only shows up when the correct device (M, L, or XL)
is detected. The attributes are described in
 Documentation/ABI/testing/sysfs-wacom

Signed-off-by: Eduard Hasenleithner <eduard@hasenleithner.at>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/input/tablet/wacom.h b/drivers/input/tablet/wacom.h
index 23317bd09c82..00332d66bc4b 100644
--- a/drivers/input/tablet/wacom.h
+++ b/drivers/input/tablet/wacom.h
@@ -114,6 +114,12 @@ struct wacom {
         struct mutex lock;
         bool open;
         char phys[32];
+        struct wacom_led {
+                u8 select; /* status led selector (0..3, -1=none) */
+                u8 llv;    /* status led brightness no button */
+                u8 hlv;    /* status led brightness button pressed */
+                u8 img_lum;   /* OLED matrix display brightness */
+        } led;
 };
 
 extern const struct usb_device_id wacom_ids[];