Fibocom L850-GL / Intel XMM7360 support

[James Wah]

Hi gang,

I've been working on a PCI driver for the Fibocom L850-GL, and while
it's very rough at this point, it sure does transfer data.

If anyone is interested in developing support in MM, or in shaping
the kernel driver into something people might actually want to use, now
would be a good time to get involved. MM integration is well beyond my
available time & expertise - I've just been doing this reverse
engineering for fun - but I'd be very happy to contribute what I can.

The modem does not speak MBIM over PCI, though it does expose some AT
ports. Most tasks eg. PIN management can be done via AT commands.

In order to initialise the modem, though, or to bring up a raw IP
interface, it's necessary to speak a custom RPC protocol. This is
unpleasant, but not unpossible; the driver I have uses a Python
userspace component to do so. The protocol is ugly but not complicated,
so a C port wouldn't be too involved.

The driver, and associated RPC tooling, are currently available here:

    https://github.com/xmm7360/xmm7360-pci

A little documentation on the RPC protocol is also available:

    https://github.com/xmm7360/xmm7360-pci

Cheerio,
James