linux-kernel - Re: [PATCH] USB: serial: option: add Fibocom FM350-GL

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Date: Thu, 27 Jun 2024 10:09:31 +0200
From: Bjørn Mork <bjorn@...k.no>
To: Johan Hovold <johan@...nel.org>
Cc: linux-usb@...r.kernel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] USB: serial: option: add Fibocom FM350-GL

Johan Hovold <johan@...nel.org> writes:
> On Wed, Jun 26, 2024 at 03:32:23PM +0200, Bjørn Mork wrote:
>> FM350-GL is 5G Sub-6 WWAN module which uses M.2 form factor interface.
>> It is based on Mediatek's MTK T700 CPU. The module supports PCIe Gen3
>> x1 and USB 2.0 and 3.0 interfaces.
>> 
>> The manufacturer states that USB is "for debug" but it has been
>> confirmed to be fully functional, except for modem-control requests on
>> some of the interfaces.
>> 
>> USB device composition is controlled by AT+GTUSBMODE=<mode> command.
>> Two values are currently supported for the <mode>:
>> 
>> 40: RNDIS+AT+AP(GNSS)+META+DEBUG+NPT+ADB
>> 41: RNDIS+AT+AP(GNSS)+META+DEBUG+NPT+ADB+AP(LOG)+AP(META)(default value)
>
> The order here does not seem to match the usb-devices output below (e.g.
> with ADB as interface 3 and 5, respectively). 
>
> Could you just update these two lines so we the interface mapping right?

Thanks, I didn't notice that.

This part was copied from the Fibocom AT+GTUSBMODE documentation and
seems to list supported functions independently of the resulting USB
interface order.

I'm afraid I can't verify the actual order since I don't have access to
this module myself, and there is no way to tell the AT, GNSS, META,
DEBUG, NPT and LOG functons from eacohother based on USB descriptors.

The best I can do is dropping these two lines. Is that better?



Bjørn