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

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Date:	Tue, 11 Nov 2008 14:20:09 +1000
From:	Peter Hutterer <peter.hutterer@...-t.net>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] input: Add a detailed multi-touch finger data report
	protocol

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
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