Re: [PATCH 2/2] usb: serial: option: add Cellient MPL200 card

[Wilken Gottwalt]

On Tue, 6 Oct 2020 09:02:01 +0200
Johan Hovold <johan@xxxxxxxxxx> 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@xxxxxxxxx> wrote:
> > > On 10/5/2020 18:06, Johan Hovold wrote:
> 
> > > > Do you remember the interface layout and why you blacklisted interface
> > > > 1?
> 
> > > 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@xxxxxxxxxxxxxxxxxxxxx/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.

Will