linux-kernel - Re: [PATCH v4] Input: Add EVIOC mechanism for MT slots

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Message-ID: <4F301B93.4030306@gmail.com>
Date:	Mon, 06 Feb 2012 19:27:31 +0100
From:	Chase Douglas <chasedouglas@...il.com>
To:	Henrik Rydberg <rydberg@...omail.se>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] Input: Add EVIOC mechanism for MT slots

On 02/06/2012 09:05 AM, Henrik Rydberg wrote:
> This patch adds the ability to extract MT slot data via a new ioctl,
> EVIOCGMTSLOTS. The function returns an array of slot values for the
> specified ABS_MT event type.
> 
> Example of user space usage:
> 
> struct { unsigned code; int values[64]; } req;
> req.code = ABS_MT_POSITION_X;
> if (ioctl(fd, EVIOCGMTSLOTS(sizeof(req)), &req) < 0)
> 	return -1;
> for (i = 0; i < 64; i++)
> 	printf("slot %d: %d\n", i, req.values[i]);
> 
> Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
> ---
> Here is the fourth version of the patch.
> 
> Rather than over-specifying the ioctl binary format by introducing a
> struct object that does not fit everyone, this version simply leaves
> all object definitions to userland.

This is fine with me. I think the ioctl macro definition would be easier
to work with if it took the number of values instead of the size of the
request, but it's a nit-pick. If Dmitry thinks this is good enough, it's
good enough for me too :).

Reviewed-by: Chase Douglas <chase.douglas@...onical.com>

Thanks!
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