On Tue, Nov 23, 2010 at 12:48:07PM -0800, Ping Cheng wrote: > Hi all, > > I am not going to write a patch for this request before I get the > permission for the new tool type. It affects all touch screen devices > (under drivers/input/touchscreen) that support both pen and touch. > > Right now, in the user land, BTN_TOUCH is used to indicate a single > touch events. BTN_TOUCH and !BTN_TOOL_PEN > (http://udev.sourcearchive.com/documentation/161-1/input__id_8c-source.html) > are used to determine if the device is a touch screen device or not a > pen. With both pen and touch on the same logical port (serial touch > screen with pen and touch enabled, refer to wacom_w8001.c), BTN_TOUCH > and !BTN_TOOL_PEN will always be false, which indicates a > non-touchscreen device. That is wrong. > > Unless we have other means to tell the user land a device is a > touchscreen, BTN_TOUCH with !BTN_TOOL_PEN won't do the job for us. > > I've already had a value for the new type: > > +#define BTN_TOOL_TOUCH 0x149 > > This new type resolves the confusion we had for the existing serial > pen and touch enabled touchscreen devices. Considering we are merging > the two logical ports for USB devices, the new type is required for > the future USB touchscreen support as well. How is BTN_TOOL_TOUCH is different from BTN_TOOL_FINGER? -- 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
