thinkpad-acpi: basic ALSA mixer support (v2)
Add the basic ALSA mixer functionality. The mixer is event-driven, and will work fine on IBM ThinkPads. I expect Lenovo ThinkPads will cause some trouble with the event interface. Heavily based on work by Lorne Applebaum <lorne.applebaum@gmail.com> and ideas from Matthew Garrett <mjg@redhat.com>. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Cc: Lorne Applebaum <lorne.applebaum@gmail.com> Cc: Matthew Garrett <mjg@redhat.com> Signed-off-by: Len Brown <len.brown@intel.com>
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