This patch adds a code that implements communication channel between the
driver and the firmware.
Acked-by: NJohn Griffin <john.griffin@intel.com>
Reviewed-by: NBruce W. Allan <bruce.w.allan@intel.com>
Signed-off-by: NTadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>