On Fri, May 6, 2011 at 10:32 AM, Eduard Hasenleithner <eduard@xxxxxxxxxxxxxxxx> wrote: > Apparently, for a device having only four LEDs wacom managed to implement a > behaviour, which is not easy to explain. These four LEDs have two functions, > one is the "status" LED function, the other is what I call the "wheel > function indicator" LED function. > > Devices before Intuos4 just had a single status LED with three luminance > levels "high" and "low" and "off". When "off" it means that the device is > not ready for use (e.g driver not loaded, or device not connected). When > "low", this LED just says to the user "Driver loaded, ready for input". When > the stylus then touches the tablet surface, it lights with the "high" level. > The same behavior is also obvserved when the stylus is in proximity to the > tablet, and a button on the stylus is pressed. In the end, having the > status-LED at "high" level means that logically at least one stylus "button" > is pressed, including the vitual "stylus has contact with tablet surface" > button. > > The Intuos4 adds the possibility to set the luminance levels for "high" and > "low" states, with values from 0..127. low=32 and high=64 means that the > status led will brighten during stylus contact, low=64 and high=32 will > cause the status LED to dim during stylus contact. > > With Intuos4 wacom also added a touch wheel to the tablet. In the > windows-driver it is possible to control four different "axes" with the > single touch wheel. In order to know which axis is controlled, they could > have simply added another four LEDs, with one of them being "on", giving a > total of five leds. But they saved one LED, and put the status information > to the one LED which shows the current wheel function "selection". I see. Do all 4 leds share the settings for luminance? -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
