usb:serial:optrion: fix dwm-158 3g modem interface

[Johan Hovold <johan@kernel.org>]

On Mon, Apr 23, 2018 at 11:21:32PM -0500, Dan Williams wrote:
> On Tue, 2018-04-24 at 09:55 +0700, Lars Melin wrote:
> > On 4/23/2018 23:54, Dan Williams wrote:
> > 
> > > > MI_00 D-Link Mobile Broadband Device  (cdc_ether)
> > > > MI_02 D-Link HSPA+DataCard Diagnostics Interface (also ppp m
> > > > MI_03 D-Link HSPA+DataCard NMEA Device
> > > > MI_04 D-Link HSPA+DataCard Speech Port
> > > 
> > > Any idea what format this port speaks?  Some Huawei Qualcomm-based
> > > devices still use a TTY driver but send/receive 16-bit 8000hz PCM
> > > audio
> > > frames via a serial port.  If the D-Link does something similar, it
> > > may
> > > still make sense to drive it via option.
> > > 
> > > > MI_05 D-Link HSPA+DataCard Debug Port
> > > 
> > > If it's FCCID KA2WM158B1 then it's a Qualcomm device, and this port
> > > may
> > > be a DIAG port.  It should also be driven by option if that's the
> > > case.
> > > 
> > > I looked but couldn't find downloadable drivers for the DWM-158 so
> > > I
> > > couldn't double-check myself.
> > > 
> > > Dan
> > 
> > This is a DWM-158D1 or maybe they have versioned it E1, it is
> > Mediatek 
> > based.
> 
> Fair enough, then it certainly won't have DM/DIAG.

Thanks for verifying. I'll go drop the stable tags from this one just in
case.

Johan
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