On Fri, Nov 29, 2013 at 01:11:53PM +0000, Charles Keepax wrote:
I am leading more towards adding new ioctl for this along with new ones for enumerating controls. Then additional support for alsa-lib and tinyalsa. That way existing tinymix, amxier can see these as controls while not disturbing existing apps. I dont think we need save and restor, then alsactl need not be modified.
It does feel a little odd to have this data set through a different interface to other existing control data, but I guess anything we do does have to be very careful around upsetting existing user-space code.
Am thinking users and driver shouldn't feel that it is different. The approach i am leaning now is adding three ioctls, for enumerating, reading and then writing. The tinyalsa and alsa-lib should also enumerate these new ones. But we don't impact ABI so old users/apps won't change. Similarly on kernel side we still treat these as kcontrols and drivers use existing infrastructure to manage these...