From venkatagorla at gmail.com  Thu Mar  3 04:05:37 2016
From: venkatagorla at gmail.com (Venkat Gorla)
Date: Thu, 3 Mar 2016 14:35:37 +0530
Subject: [Fw_Os_Forum] How to detect devices that support touch
Message-ID: <CAGLpa6oojsK-hxHZrHDGd6rCz_rHcsq92wPKyEBHiDFmCOOPaA@mail.gmail.com>

Hello,

We are making some product changes that are specific to touch devices (such
as a tablet) in the Windows pre-boot UEFI environment. I am referring the
following document for the UEFI specification:
http://www.uefi.org/sites/default/files/resources/UEFI_Spec_2_3_1.pdf

However I haven't been able to definitively check for touch devices vs
non-touch devices using the specification.

For example, querying for the absolute pointer protocol interface succeeds
even on a non-touch device such as a laptop or a desktop. Additionally, the
absolute max X and max Y values are also being reported as non-zero when I
query the "Mode" of the protocol interface.

So my question is how do I filter out the negative scenarios (devices that
don't support touch) using the UEFI specification?

Any pointers or help will is much appreciated.

Thanks,
Venkat
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From Aaron.Pop at congatec.com  Thu Mar  3 13:08:38 2016
From: Aaron.Pop at congatec.com (Aaron.Pop at congatec.com)
Date: Thu, 3 Mar 2016 10:08:38 -0800
Subject: [Fw_Os_Forum] How to detect devices that support touch
In-Reply-To: <CAGLpa6oojsK-hxHZrHDGd6rCz_rHcsq92wPKyEBHiDFmCOOPaA@mail.gmail.com>
References: <CAGLpa6oojsK-hxHZrHDGd6rCz_rHcsq92wPKyEBHiDFmCOOPaA@mail.gmail.com>
Message-ID: <OF9D5785BC.EE099DDD-ON88257F6B.00632751-88257F6B.0063AB18@congatec.com>

EDK implements a console splitter for input device.  This console splitter 
creates a absolute pointer protocol instance that does not contain a 
device path.

You can locate a handle buffer of all the handles that contain an absolute 
pointer protocol, and then you can go through the handles and make sure 
that there is a handle that contains a device path.  If there are no 
absolute pointer instances that contain a device path.





From:   Venkat Gorla <venkatagorla at gmail.com>
To:     fw_os_forum at mailman.uefi.org, 
Date:   03/03/2016 01:06 AM
Subject:        [Fw_Os_Forum] How to detect devices that support touch
Sent by:        fw_os_forum-bounces at mailman.uefi.org



Hello,

We are making some product changes that are specific to touch devices 
(such as a tablet) in the Windows pre-boot UEFI environment. I am 
referring the following document for the UEFI specification:
http://www.uefi.org/sites/default/files/resources/UEFI_Spec_2_3_1.pdf

However I haven't been able to definitively check for touch devices vs 
non-touch devices using the specification.

For example, querying for the absolute pointer protocol interface succeeds 
even on a non-touch device such as a laptop or a desktop. Additionally, 
the absolute max X and max Y values are also being reported as non-zero 
when I query the "Mode" of the protocol interface.

So my question is how do I filter out the negative scenarios (devices that 
don't support touch) using the UEFI specification?

Any pointers or help will is much appreciated.

Thanks,
Venkat _______________________________________________
Fw_os_forum mailing list
Fw_os_forum at mailman.uefi.org
http://lists.mailman.uefi.org/mailman/listinfo/fw_os_forum
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