USB: serial: option: adding support for ublox R410M

[Johan Hovold <johan@kernel.org>]

On Thu, Apr 26, 2018 at 11:22:25PM +0700, Lars Melin wrote:
> On 4/26/2018 23:12, Johan Hovold wrote:
> > On Thu, Apr 26, 2018 at 06:40:46PM +0700, Lars Melin wrote:
> >> On 4/26/2018 18:39, Lars Melin wrote:
> >>> On 4/26/2018 18:19, Bjørn Mork wrote:
> >>>> Anyway, Qualcomm based designs are definitely handled by both drivers.
> >>>> Using qcserial only makes sense if the interface layout matches one of
> >>>> the defined shared schemes, which currently are:
> >>>>
> >>>>      QCSERIAL_G2K = 0,    /* Gobi 2000 */
> >>>>      QCSERIAL_G1K = 1,    /* Gobi 1000 */
> >>>>      QCSERIAL_SWI = 2,    /* Sierra Wireless */
> >>>>      QCSERIAL_HWI = 3,    /* Huawei */
> >>>
> >>> It seems to me that this Quectel device matches the interface layout for
> >>> Gobi1K:

> > Yeah, but qcserial appears to select a different altsetting for the DM
> > port for Gobi 1000, an altsetting which this particular device does not
> > have.
> > 
> > I didn't re-read the full thread I referred to earlier, but I think in
> > it, Dan mentioned Gobi 1000 device requiring firmware to be loaded too.
> > 
> > So if it's not a G1K device, we probably shouldn't be using qcserial
> > even if the interface layout happens to match.

> Good point, I forgot about the required firmware loading for Gobi1K.
> So this device should be handled by the option driver.

Yeah, we probably should document all of this at some point. :)

I didn't include the patch in this weeks -rc updates, but I've queued it
up for the next batch.

Thanks everyone.

Johan
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