linux-kernel - Re: Atom/GMA500

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Message-ID: <20171023145009.27afe421@alans-desktop>
Date:   Mon, 23 Oct 2017 14:50:09 +0100
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     Benoit Vaillant <benoit.vaillant@...log.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: Atom/GMA500

On Sat, 21 Oct 2017 17:31:10 +0200
Benoit Vaillant <benoit.vaillant@...log.org> wrote:

> Hello,
> 
> This is my first post here so please do point me to other places if
> this is not the mailing list to follow. I've tried IRC #debian and
> #linux which pointed to ask here. So here I am.

Welcome

> Although I've got a lot of questions, my first one is on the gma500
> linux device driver. I'd like to make the touchscreen be recognized.

The GMA500 is just a graphics driver. If there is a touchscreen then that
is connected to something else entirely.

It's also quite a limited graphics driver - it'll do mode setting and very
fast text mode console but has no 2D/3D acceleration support included
because Imagination always kept the 3D acceleration info secret and the 2D
acceleration wasn't worth supporting.

> Is this anything doable[2] in the current state of the kernel? I'm
> using 4.9.0-4-686-pae, but can switch to any other brach if prefered,
> like linux-4.14-rc4.
> 
> TIH,
> 

The usb would best be viewed with a more detailed lsusb (-vv or similar)
but I'd guess that

Syntek is the camera
Primax is the built in mouse
Option is the 3G Modem

so the touch screen would presumably be hiding somewhere else. Given the
platform I would guess its either using the mouse port or a serial port.
I don't remember any built in i2c/spi controller on that chipset anyway.

If it's on the ps/2 port it might work, if it's on the serial port you
are going to have to reverse engineer the protocol.

Alan