2009/12/23 Alex Deucher <alexdeucher@gmail.com>:
2009/12/22 Christian König <deathsimple@vodafone.de>:
Well its a single PIN on the connector that is used so its like HPD in its requirements hence why I expect if its wired anywhere it'll be to a random GPIO somewhere.
Its an out-of-band protocol (not sure if its i2c) to turn on/off HDMI devices etc. Nope not i2c, but similar. CEC is a very slow (around 300bps) one wire
Am Mittwoch, den 23.12.2009, 08:44 +1000 schrieb Dave Airlie: protocol, with multiplexed clock/data. You can control a bunch of different thinks with this, input select, volume control, deck control (play, stop pause etc..) and (that's the interesting part) low level remote control key codes. And yes connecting this to an GPIO pin would make sense, with this low baud rates you could read it by just polling the bit.
I can control my television, bluray player and AV-receiver just with the remote of my AV-receiver, if I could replace my lirc driven remote with CEC, I could control all my home cinema with only one remote. That sounds quite promising to me.
If it is a gpio, I would suggest walking the record tree for the hdmi connector in the object header and looking for a gpio record.
Of course my other guess is that its wired to nowhere useful, at least no GPU vendor exposes HDMI-CEC yet in any drivers from what I can see, Its been a long time since I've had access to card schematics, maybe bridgman could go look ;-) Dave. -- To unsubscribe, e-mail: radeonhd+unsubscribe@opensuse.org For additional commands, e-mail: radeonhd+help@opensuse.org