On Oct 13 Jonathan Woithe wrote:
for cases like MOTU, where mixer control setting updates are pushed to the computer by the device in response to front panel actions, there will be a need for userspace to somehow tap into this flow. Userspace could not gain access to the iso stream because the kernel will have control over that. Or can userspace tap into iso streams that have been initiated by the kernel (that is surprising to me if it's true).
Indeed we do not have support for multiple local listeners on the same stream. (firewire-core supports multiple listeners for FCP reception, but this is a simpler case in several respects.)
I guess getting MOTU status out to userspace could work by having the audio driver extract the data from the stream and push it as a new type of event of the <sound/firewire.h> API through the ALSA hwdep interface.
(Apologies for going somewhat offtopic.)