Re: [PATCH] input: Add a detailed multi-touch finger data report protocol

Peter Hutterer
2008-11-11T04:21:46Z

On Fri, Nov 07, 2008 at 12:15:29PM +0100, Henrik Rydberg wrote:
> In order to utilize the full power of the new multi-touch devices, a
> way to report detailed finger data to user space is needed. This patch
> adds a multi-touch (MT) protocol which allows drivers to report details
> for an arbitrary number of fingers.

[...]

> /* We avoid low common keys in module aliases so they don't get huge. */
> #define KEY_MIN_INTERESTING KEY_MUTE
> #define KEY_MAX 0x2ff
> @@ -642,6 +645,15 @@ struct input_absinfo {
> #define ABS_TOOL_WIDTH 0x1c
> #define ABS_VOLUME 0x20
> #define ABS_MISC 0x28
> +#define ABS_MT_TOUCH 0x30 /* Diameter of touching circle */
> +#define ABS_MT_TOUCH_MAJOR 0x30 /* Major axis of touching ellipse */
> +#define ABS_MT_TOUCH_MINOR 0x31 /* Minor axis of touching ellipse */
> +#define ABS_MT_WIDTH 0x32 /* Diameter of approaching circle */
> +#define ABS_MT_WIDTH_MAJOR 0x32 /* Major axis of approaching ellipse */
> +#define ABS_MT_WIDTH_MINOR 0x33 /* Minor axis of approaching ellipse */
> +#define ABS_MT_ORIENTATION 0x34 /* Ellipse orientation */
> +#define ABS_MT_POSITION_X 0x35 /* Center X ellipse position */
> +#define ABS_MT_POSITION_Y 0x36 /* Center Y ellipse position */
> #define ABS_MAX 0x3f
> #define ABS_CNT (ABS_MAX+1)

is there hardware that can do finger identification? (i.e. thumb vs. index
finger)? Should we accommodate for this?

Cheers,
Peter