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

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Date:	Wed, 19 Nov 2008 11:37:03 -0500
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	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

Hi Henrik,

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.
> 
> BTN_MT_REPORT_PACKET
> 
> The driver presses this button to indicate the start of a packet of
> finger data. The button is released after the whole packet has been
> reported.
> 
> BTN_MT_REPORT_FINGER
> 
> The driver presses this button to indicate the start of a new
> finger. The button is released when the finger has been reported.
> 
> In order to stay compatible with existing applications, the data
> reported in a finger packet must not be recognized as single-touch
> events. Therefore, a specific set of ABS_MT events is used instead.
> 
> Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
> ---
>  include/linux/input.h |   12 ++++++++++++
>  1 files changed, 12 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/input.h b/include/linux/input.h
> index b86fb55..c82dd42 100644
> --- a/include/linux/input.h
> +++ b/include/linux/input.h
> @@ -590,6 +590,9 @@ struct input_absinfo {
>  #define KEY_NUMERIC_STAR	0x20a
>  #define KEY_NUMERIC_POUND	0x20b
> 
> +#define BTN_MT_REPORT_PACKET	0x210	/* report multitouch packet data */
> +#define BTN_MT_REPORT_FINGER	0x211	/* report multitouch finger data */
> +
>  /* 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)
> 

Sorry for the long silence. I don't think utilizing button events for
this is a good idea. I'd rather just start reporting extended touch
events for a finger and signal end of sub-packet with something like
EV_SYN/SYN_MT_REPORT.

-- 
Dmitry
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