CEC: AOCEC libcec support

[Ray-future]

This PR makes CEC work with the existing LibCEC AOCEC Adapter. It is basically a short port from the work me and @gdachs did for the 3.14 Kernel. I have not bothered to bring back the legacy CEC input mode which some users like. I'm not sure it's worth it but if I do I will make a seperate PR.

Here are the changes explained.

• Renaming the devnode because /dev/cec was a bit ambiguous in LibCEC so we made it a little bit more amlogic specific.
• Disable kernel cec processing when libcec is used in cec_task
• Return values were fixed to correspond to what libcec expects.
• Removed CEC_INFO print that is spamming kernel log

Tested on Odroid N2 with CoreELEC on Samsung FHD TV and on LG OLED. Works as expected. I know that HK is using a udev rule in ubuntu to symlink the devnode to /dev/aocec so let me know if you want me to drop this change and rebase.

Thanks

[mdrjr]

hi @Raybuntu First thank you for this..

I just have one question before I merge this (as I do prefer to run the libcec version). Is the AOCEC driver merged on upstream libcec or we need to use some downstream patch?

This is for the porpouse of documentation so I can have libcec+kodi working on our Ubuntu image

[Ray-future]

The AOCEC adapter in libcec was merged a long time ago. With the above changes it works ootb with vanilla libcec.

[Ray-future]

But I have not tested it on Ubuntu so you might want to give it a quick test.

[mdrjr]

Hi @Raybuntu I always have to provide our own packages anyway...

I'm merging this :) @Raybuntu As usual thank you so much for your efforts 🥇

[Ray-future]

My pleasure. We (Team CoreELEC) have other changes as we forked the kernel: https://github.com/CoreELEC/linux-amlogic/commits/amlogic-4.9

Some of which are only CE specific but we will upstream as much as possible. We already started to port gxbb over to 4.9 kernel so Odroid C2 might benefit from this more recent kernel too soon.

Thanks R