Hello Greg, > > I am developing a USB HID device (simple keyboard). I want to have 2 > > different such keyboards connected to the same computer to share the > > shift, control, alt or any such modifier key. So, I do not have to > > have the same modifier key on the different keyboards connected to the > > same computer. > > > > I could think about writing a kernel device driver to facilitate such > > communication. But, other than that, Is there some mechanism that I > > can use to ensure that the 2 HID keyboards can communicate with each other > > when any such modifier key is pressed on either of them? > > > > I can easily add more endpoints, etc., on the device, if that helps. > > USB devices can not "communicate with each other", sorry, the spec > doesn't allow that. > > But, the OS can "combine" all of the HID devices into one big device, > which I think you will find is the default way Linux works for > keyboards. > > But, modifier keys are "hard" in that I don't think a modifier key of > one keyboard will affect the other keyboard, but you can easily try this > by plugging in two keyboards and seeing what happens. I tried to see if the setReport of Led's are communicated between keyboards. But, I noticed that it is not. That report is being just sent to the keyboard that sends that modifier. Not sure if this behaviour can be tweaked with a setting. Any thoughts, please? Thanks Joe -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
