linux-kernel - Re: [PATCH] net: usb: cdc_mbim: adding Microsoft mobile broadband modem

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Message-ID: <CAGRyCJGTXWNPmF6ZgTJuxzy++rbpS_irJAhv7Jrhg0BMqqwA3w@mail.gmail.com>
Date:   Thu, 4 Aug 2022 09:08:24 +0200
From:   Daniele Palmas <dnlplm@...il.com>
To:     Seunghun Han <kkamagui@...il.com>
Cc:     Oliver Neukum <oliver@...kum.org>,
        David Miller <davem@...emloft.net>,
        linux-usb <linux-usb@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: usb: cdc_mbim: adding Microsoft mobile broadband modem

Hello Seunghun,

Il giorno mer 3 ago 2022 alle ore 14:56 Seunghun Han
<kkamagui@...il.com> ha scritto:
>
> Hello Daniele,
>
> On Wed, Aug 3, 2022 at 7:58 PM Daniele Palmas <dnlplm@...il.com> wrote:
> >
> > Just for reference, are you allowed to disclose which chipsets these
> > modems are based on?
> >
> > Thanks,
> > Daniele
>
> I'm not sure which chipsets are used for them. In the Windows
> environment, the information that I could find was Microsoft Surface
> Mobile Broadband Modem. Some people guess they are based on Qualcomm
> Snapdragon X16 and successors, but I could find no evidence about
> them.
>
> If you know the way, would you tell me how I can find or confirm it?
>

Unfortunately I'm not aware of any specific place for that: I wrongly
thought that you were involved in the development of the modem and you
knew the chipset.

However, sometimes the name of the chipset is left in the firmware
revision: you can try looking if there's any hint in the output of the
device caps request. If it's a Qualcomm modem it should probably also
support QMI-over-MBIM service, so maybe you can also try a few DMS
requests (--dms-get-software-version, --dms-get-revision...).

Sometimes also the USB descriptors can be useful.

Regards,
Daniele

> Best regards,
> Seunghun