On Wed, May 08, 2013 at 01:20:58PM -0400, Todd Showalter wrote: > On Wed, May 8, 2013 at 1:05 PM, Dmitry Torokhov > <dmitry.torokhov@xxxxxxxxx> wrote: > > > Or you have your library that provides ABS->BTN translation. > > > > You can even have your API structured such that consumer provides list > > of events it is interested in and the library tries to synthesize > > missing events if it can. > > That's in the plans. > > > So we already have: > > > > #define BTN_A 0x130 > > #define BTN_B 0x131 > > #define BTN_C 0x132 > > #define BTN_X 0x133 > > #define BTN_Y 0x134 > > #define BTN_Z 0x135 > > #define BTN_TL 0x136 > > #define BTN_TR 0x137 > > #define BTN_TL2 0x138 > > #define BTN_TR2 0x139 > > #define BTN_SELECT 0x13a > > #define BTN_START 0x13b > > #define BTN_MODE 0x13c > > #define BTN_THUMBL 0x13d > > #define BTN_THUMBR 0x13e > > > > So if we really want to have BTN_NORTH, etc, we want to alias existing > > ones. > > The problem is that the alias differs with hardware. BTN_A would be: > > - BTN_SOUTH on xbox gamepads > - BTN_EAST on nintendo gamepads and ouya > > Nintendo is: > > A -> WEST > B -> SOUTH > X -> NORTH > Y -> EAST > > While Microsoft is: > > A -> SOUTH > B -> EAST > X -> WEST > Y -> NORTH > > They're mirror images of each other. So just aliasing is going to > break something. We should take existing in-kernel mapping (that would be XBOX and other less advanced gamepads in drivers/input/joystick), alias NORTH/SOUTH/EAST/WEST accordingly, have new users use NSEW button definitions. Thanks. -- 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
