linux-kernel - Re: wwan/iosm vs. xmm7360

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Date:   Fri, 6 Aug 2021 11:41:27 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     "Kumar, M Chetan" <m.chetan.kumar@...ux.intel.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Netdev List <netdev@...r.kernel.org>,
        linuxwwan@...el.com
Subject: Re: wwan/iosm vs. xmm7360

On 06.08.21 11:29, Kumar, M Chetan wrote:
> Hi Jan,
> 
> What is the context of this request ?

The context is that there are many folks out there (me included - Lenovo
P52) with devices that have the xmm-7360 built-in, can't switch it to
USB mode (prevented by OEM), and currently require [1]. That kind of
works but is not really the final solution. So I also kicked off [2] there.

> 
> FYI, the driver upstreamed is for M.2 7560.

I know. I'm not an expert on the details, but reading the overall
architectures of the IOSM and what has been reverse-engineered for the
7360, there seem to be some similarities. So, maybe you can explain to
the community if that is a reasonable path to upstream 7360 support, or
if at least the pattern of the 7560 could/should be transferred to the
7360 driver.

Thanks,
Jan

[2] https://github.com/xmm7360/xmm7360-pci/issues/104

> 
> Regards,
> Chetan
> 
> On 8/6/2021 2:09 AM, Jan Kiszka wrote:
>> Hi Chetan,
>>
>> at the risk of having missed this being answered already:
>>
>> How close is the older xmm7360 to the now supported xmm7560 in mainline?
>>
>> There is that reverse engineered PCI driver [1] with non-standard
>> userland interface, and it would obviously be great to benefit from
>> common infrastructure and specifically the modem-manager compatible
>> interface. Is this realistic to achieve for the 7360, or is that
>> hardware or its firmware too different?
>>
>> Thanks,
>> Jan
>>
>> [1] https://github.com/xmm7360/xmm7360-pci
>>

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