pulled from here: https://android.googlesource.com/platform/hardware/qcom/msm8994/+/android-8.1.0_r1/kernel-headers/linux/msm_audio_calibration.h https://android.googlesource.com/platform/hardware/qcom/msm8994/+/android-8.1.0_r1/original-kernel-headers/linux/msm_audio_calibration.h