How does HAL choose the event device to listen on?

[Ben Liblit]

Jason Xia wrote:
> Hope HAL adds support for this tiny [SW_RADIO] bit in near future.

I discovered the same problem myself.  See 
<https://bugs.freedesktop.org/show_bug.cgi?id=13803> for my gradual 
process of discovery, culminating in a patch that adds SW_RADIO support. 
  Unfortunately, it doesn't seem that any HAL developer has looked at 
this.  So that clean, well-tested patch is just sitting there waiting 
for someone to apply it.  :-(