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Date:   Thu, 8 Oct 2020 09:16:04 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Wilken Gottwalt <wilken.gottwalt@...lbox.org>
Cc:     Johan Hovold <johan@...nel.org>, Lars Melin <larsm17@...il.com>,
        linux-kernel@...r.kernel.org,
        Bjørn Mork <bjorn@...k.no>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        netdev@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/2] usb: serial: option: add Cellient MPL200 card

On Thu, Oct 08, 2020 at 08:47:33AM +0200, Wilken Gottwalt wrote:
> On Tue, 6 Oct 2020 09:02:01 +0200
> Johan Hovold <johan@...nel.org> wrote:
> 
> > On Mon, Oct 05, 2020 at 02:07:23PM +0200, Wilken Gottwalt wrote:
> > > On Mon, 5 Oct 2020 18:36:36 +0700 Lars Melin <larsm17@...il.com> wrote:

> > > > It is very likely that Cellient has replaced the VID with their own and 
> > > > kept the PID, it is something other mfgrs has done when buying modules 
> > > > from Qualcomm's series of devices with predefined composition.
> > > > 
> > > > The MS Windows driver for 05c6:9025 describes the interfaces as:
> > > > 
> > > > MI_00 Qualcomm HS-USB Diagnostics 9025
> > > > MI_01 Android Composite ADB Interface
> > > > MI_02 Qualcomm HS-USB Android Modem 9025
> > > > MI_03 Qualcomm HS-USB NMEA 9025
> > > > MI_04 Qualcomm Wireless HS-USB Ethernet Adapter 9025
> > > > MI_05 USB Mass Storage Device
> > > > 
> > > > where the net interface is for QMI/RMNET.
> > > > It fully matches the blacklisting Wilken has done for 2692:9025
> > > 
> > > Does your device have a GPS connector? Mine had not and I'm not sure
> > > if the description of MI_01 is actually correct. I remember looking at
> > > this port and seeing bogus NMEA data.
> > 
> > Well if it's NMEA then the interface shouldn't be blacklisted (even if
> > the values are bogus on your device), but if it's ADB it should be as
> > that is handled by userspace.
> > 
> > Here's some lsusb output from a Cellient MPL200 that still uses the
> > Qualcomm VID:
> > 
> > 	https://www.mail-archive.com/modemmanager-devel@lists.freedesktop.org/msg04523.html
> > 
> > which gives some support to Lars's hypothesis. I guess we'll just keep
> > the first interface reserved.
> 
> Lars and Johan are right here. I found an older external Gobi driver
> where I actually added comments saying interface 1 is ADB and interface 3
> is NMEA delivering only zeroed values because of the missing antenna
> connector, at least for the models I had access to.

Great, thanks for confirming.

Johan

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