* Interface between LTE devices and Linux
@ 2018-02-08 17:10 jjDaNiMoTh
2018-02-08 17:18 ` Greg KH
2018-02-13 13:21 ` Jeffrey Walton
0 siblings, 2 replies; 6+ messages in thread
From: jjDaNiMoTh @ 2018-02-08 17:10 UTC (permalink / raw)
To: kernelnewbies
Hello everyone,
There is an example of LTE netdevice in the Linux source tree?
In particular, I would like to know if there is any device driver that
implements the layers required by the 3GPP standard. I imagine that it
should exist something since Android is communicating over LTE, but I can't
find any reference. What I fear more is that everything related to LTE is
inside the closed device firmware, and data is sent from the TC layer into
this black-box firmware through a sort of API. In this case, it would be
wonderful to know where, exactly, this API is used, to try to understand
what the firmware is doing.
Thank you!!
--
Stay open, be free.
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* Interface between LTE devices and Linux
2018-02-08 17:10 Interface between LTE devices and Linux jjDaNiMoTh
@ 2018-02-08 17:18 ` Greg KH
2018-02-13 7:59 ` Nuno Sá
2018-02-13 13:21 ` Jeffrey Walton
1 sibling, 1 reply; 6+ messages in thread
From: Greg KH @ 2018-02-08 17:18 UTC (permalink / raw)
To: kernelnewbies
On Thu, Feb 08, 2018 at 06:10:59PM +0100, jjDaNiMoTh wrote:
> Hello everyone,
>
> There is an example of LTE netdevice in the Linux source tree?
>
> In particular, I would like to know if there is any device driver that
> implements the layers required by the 3GPP standard. I imagine that it
> should exist something since Android is communicating over LTE, but I can't
> find any reference.
That communication happens usually through a "dumb" serial-like
connection to the LTE modem. All of the modem commands are handled in
userspace, the kernel doesn't care about anything relating to this at
all (and it really shouldn't).
> What I fear more is that everything related to LTE is inside the
> closed device firmware, and data is sent from the TC layer into this
> black-box firmware through a sort of API. In this case, it would be
> wonderful to know where, exactly, this API is used, to try to
> understand what the firmware is doing.
Look at the Android AOSP images for the location for most of this logic,
there should be a Telephony HAL somewhere in there that handles the
heavy-lifting of all of this logic.
Good luck!
greg k-h
^ permalink raw reply [flat|nested] 6+ messages in thread
* Interface between LTE devices and Linux
2018-02-08 17:18 ` Greg KH
@ 2018-02-13 7:59 ` Nuno Sá
0 siblings, 0 replies; 6+ messages in thread
From: Nuno Sá @ 2018-02-13 7:59 UTC (permalink / raw)
To: kernelnewbies
On 02/08/2018 06:18 PM, Greg KH wrote:
> On Thu, Feb 08, 2018 at 06:10:59PM +0100, jjDaNiMoTh wrote:
>> Hello everyone,
>>
>> There is an example of LTE netdevice in the Linux source tree?
>>
>> In particular, I would like to know if there is any device driver that
>> implements the layers required by the 3GPP standard. I imagine that it
>> should exist something since Android is communicating over LTE, but I can't
>> find any reference.
>
> That communication happens usually through a "dumb" serial-like
> connection to the LTE modem. All of the modem commands are handled in
> userspace, the kernel doesn't care about anything relating to this at
> all (and it really shouldn't).
>
>> What I fear more is that everything related to LTE is inside the
>> closed device firmware, and data is sent from the TC layer into this
>> black-box firmware through a sort of API. In this case, it would be
>> wonderful to know where, exactly, this API is used, to try to
>> understand what the firmware is doing.
>
> Look at the Android AOSP images for the location for most of this logic,
> there should be a Telephony HAL somewhere in there that handles the
> heavy-lifting of all of this logic.
>
As far as i know in AOSP you can look into hardware/ril for the modem
integration. There is a generic RIL daemon which interacts with a RIL
library which is vendor specific and is responsible to configure the
hardware. And that can be a problem because the vendor software most
likely is not open source but you may always give a look to the daemon
which is part of the
> Good luck!
>
> greg k-h
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Interface between LTE devices and Linux
2018-02-08 17:10 Interface between LTE devices and Linux jjDaNiMoTh
2018-02-08 17:18 ` Greg KH
@ 2018-02-13 13:21 ` Jeffrey Walton
2018-02-13 15:30 ` Bjørn Mork
1 sibling, 1 reply; 6+ messages in thread
From: Jeffrey Walton @ 2018-02-13 13:21 UTC (permalink / raw)
To: kernelnewbies
On Thu, Feb 8, 2018 at 12:10 PM, jjDaNiMoTh <jjdanimoth@gmail.com> wrote:
> Hello everyone,
>
> There is an example of LTE netdevice in the Linux source tree?
>
> In particular, I would like to know if there is any device driver that
> implements the layers required by the 3GPP standard. I imagine that it
> should exist something since Android is communicating over LTE, but I can't
> find any reference. What I fear more is that everything related to LTE is
> inside the closed device firmware, and data is sent from the TC layer into
> this black-box firmware through a sort of API. In this case, it would be
> wonderful to know where, exactly, this API is used, to try to understand
> what the firmware is doing.
In addition to GKH's answer, what I have seen...
Some Android code to talk to the radio is written in plain java, like
https://chromium.googlesource.com/android_tools/+/18728e9dd5dd66d4f5edf1b792e77e2b544a1cb0/sdk/sources/android-19/com/android/internal/telephony/CommandsInterface.java
.
The GNU Radio folks may have relevant information. I seem to recall
they work from userland and not the kernel, though.
Jeff
^ permalink raw reply [flat|nested] 6+ messages in thread
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-- links below jump to the message on this page --
2018-02-08 17:10 Interface between LTE devices and Linux jjDaNiMoTh
2018-02-08 17:18 ` Greg KH
2018-02-13 7:59 ` Nuno Sá
2018-02-13 13:21 ` Jeffrey Walton
2018-02-13 15:30 ` Bjørn Mork
2018-02-13 16:07 ` Jeffrey Walton
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