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From: Christoph Fritz <chf.fritz@googlemail.com>
To: "Denilson Figueiredo de Sá" <denilsonsa@gmail.com>
Cc: linux-kernel@vger.kernel.org, Jiri Kosina <jkosina@suse.cz>,
	linux-input@vger.kernel.org, linux-usb@vger.kernel.org
Subject: Re: Linux USB HID should ignore values outside Logical Minimum/Maximum range
Date: Mon, 24 Oct 2011 19:09:43 +0200	[thread overview]
Message-ID: <1319476183.3210.12.camel@lovely> (raw)
In-Reply-To: <op.v3q34la3dsdv5o@localhost>

Hi Denilson,

 please see my comment below.

On Sat, 2011-10-22 at 09:42 -0200, Denilson Figueiredo de Sá wrote:
> Short description:
> 
> An absolute pointing device using USB HID defines a LOGICAL_MINIMUM and
> a LOGICAL_MAXIMUM for X, Y axes, and then sends a HID report containing
> values outside that range.
> 
> Linux kernel should ignore values outside that range, as they are not
> meaningful.

To answer with a quote from the comment above input.h:"struct
input_absinfo":

 *
 * Note that input core does not clamp reported values to the
 * [minimum, maximum] limits, such task is left to userspace.
 *

to do so, use this from input.h:

#define EVIOCGABS(abs)		_IOR('E', 0x40 + (abs), struct input_absinfo)	/* get abs value/limits */
#define EVIOCSABS(abs)		_IOW('E', 0xc0 + (abs), struct input_absinfo)	/* set abs value/limits */


> <SNIP>

Thanks,
 -- chf


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  parent reply	other threads:[~2011-10-24 17:02 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-10-22 11:42 Linux USB HID should ignore values outside Logical Minimum/Maximum range Denilson Figueiredo de Sá
2011-10-24 16:24 ` Chris Friesen
2011-10-24 16:39   ` Denilson Figueiredo de Sá
2011-10-24 20:35     ` Dmitry Torokhov
2011-10-25  4:03     ` Denilson Figueiredo de Sá
2011-10-24 17:09 ` Christoph Fritz [this message]
2011-10-24 17:04   ` Denilson Figueiredo de Sá
2011-10-24 20:32   ` Dmitry Torokhov
2011-10-28 16:23     ` Jiri Kosina
2011-10-28 19:27       ` Christoph Fritz
2011-10-28 20:40       ` Denilson Figueiredo de Sá
2011-10-31 15:24         ` Jiri Kosina
2011-11-02 23:39           ` Denilson Figueiredo de Sá
2011-11-16 14:01             ` Jiri Kosina

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