Re: [Xen-devel] [RFC] kbdif: add multi-touch support

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 03.01.17 at 16:39, <andr2000@xxxxxxxxx> wrote:
> --- a/xen/include/public/io/kbdif.h
> +++ b/xen/include/public/io/kbdif.h
> @@ -45,6 +45,19 @@
>   */
>  #define XENKBD_TYPE_POS     4
>  
> +/*
> + * Multi-touch event
> + * Capable backend sets feature-multi-touch in xenstore.
> + * Frontend requests feature by setting request-multi-touch in xenstore.
> + * Frontend supports up to XENKBD_MT_NUM_DEV virtual multi-touch input 
> devices,
> + * configured by the backend in xenstore under mt-%d folder, %d being
> + * a sequential number of the virtual input device:
> + *   o num-contacts - number of simultaneous touches supported
> + *   o width - width of the touch area in pixels
> + *   o height - height of the touch area in pixels
> + */
> +#define XENKBD_TYPE_MTOUCH  5
> +
>  struct xenkbd_motion
>  {
>      uint8_t type;        /* XENKBD_TYPE_MOTION */
> @@ -68,6 +81,56 @@ struct xenkbd_position
>      int32_t rel_z;       /* relative Z motion (wheel) */
>  };
>  
> +/* number of simultaneously supported multi-touch virtual input devices */
> +#define XENKBD_MT_NUM_DEV   4

Why is this limit needed? There's no use of it within the other
interface additions you make.

Jan


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