In some systems our voice trigger firmwares will be used only to provide an event that indicates the trigger phrase was spoken, this patch chain adds support for this use-case. There are two parts to adding this support firstly, a mechanism is required to get the DSP to power on without the compressed stream being opened, this is done by means of a virtual output for the voice trigger in the DAPM graph. Secondly, the trigger event needs to be handled. Typically this will be used to generate a key press event, but there are numerous options what could be done here, and vendors often have their own rather strong opinions. Rather than dictate the usage at the driver level we we simply provide a notifier that can be caught in the machine driver and appropriate action can be taken there.
Thanks, Charles
Charles Keepax (5): ASoC: arizona: Tie SYSCLK to DRC signal activity widgets ASoC: arizona: Add voice trigger output widget ASoC: wm_adsp: Specifically propagate voice trigger event to caller ASoC: arizona: Add a notifier chain for CODEC events ASoC: arizona: Add event notification on voice trigger events
include/linux/mfd/arizona/core.h | 10 ++++++++++ sound/soc/codecs/arizona.c | 43 ++++++++++++++++++++++++++++++++++++++++ sound/soc/codecs/arizona.h | 15 ++++++++++++++ sound/soc/codecs/cs47l24.c | 16 +++++++++++++++ sound/soc/codecs/wm5102.c | 1 + sound/soc/codecs/wm5110.c | 16 +++++++++++++++ sound/soc/codecs/wm8998.c | 1 + sound/soc/codecs/wm_adsp.c | 5 +++++ sound/soc/codecs/wm_adsp.h | 4 ++++ 9 files changed, 111 insertions(+)