[alsa-devel] Declaring HDMI channel allocation to kernel

[Gabriel M. Beddingfield]

Is there an established way for me (from userspace) to pass the HDMI 
Channel Allocation (1 byte) to the driver?  If not, can you recommend an 
approach?

In most of the drivers that I've inspected, the drivers seem to assume 
that there's a 1:1 mapping of Number-of-Channels to Channel-Allocation. 
  However, the HDMI sink declares which speakers it has attached in the 
EDID.  If I can match this in userspace... I need a way to communicate 
it to the driver.

-gabriel