Merge series from Charles Keepax <ckeepax@opensource.cirrus.com>: Some fixups to the jack handling, adding some necessary hooks to connect things with the machine driver. I have split these out from the system suspend chain as that has been generating a fair amount of discussion and getting these 3 merged is far more important to get basic functionality working smoothly. I will do a spin of the system suspend stuff soon, if either no new comments pop up, or we reach some consensus on how to proceed.