[coreboot] x60 : adding WWAN support

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 01.09.2014 22:19, Charles Devereaux wrote:
> Hello
> 
> I'm interested in WWAN support, mostly for the GPS features and the cool
> things you can do with them (like a stratum ntp server).
> 
Most GPS receivers don't have enough precision for any timing.
> I was told a EM770W doesn't even need a network registration to output
> NMEA coordinates
> (http://forum.thinkpads.com/viewtopic.php?f=30&t=114426#p735612) so I
> got one.
> 
> I looked at patch #4056 which enable WWAN for the EC, but it seems to
> only part of the job: the ACPI table should also contain a GWAN key for
> thinkpad-acpi
> 
Not necessary.
> Apparently, this last part cause the WWAN card not to be handled by
> thinkpad-acpi, which would otherwise provide rfkill support (usefull to
> save power, something I'd like to improve)
Soft rfkill is always available through wwan driver.

> I believe similar entries should be added to coreboot asl, but I'm not
> sure of how integrated they should be. If I understand correctly,
> following the logic of patch #5242, there should be a conditional
> statement then some acpigen.
> 
5242 is very special because of wacom tablet interaction (serial device
naming)
See src/ec/lenovo/h8/acpi/ec.asl and included files for the relevant scopes


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