audio-hal: soft step volume params controls

set/get soft step volume control params values dynamically
for each usecase. each usecase can set different params values.
these values are set to module through mixer command.

Change-Id: I8ae200046ca5ab1ce253fc43e241d794fbb52183
Signed-off-by: Krishna Kishor Jha <quic_kkishorj@quicinc.com>
diff --git a/hal/audio_hw.h b/hal/audio_hw.h
index c424ec1..a8b5fb0 100755
--- a/hal/audio_hw.h
+++ b/hal/audio_hw.h
@@ -33,6 +33,40 @@
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 #ifndef QCOM_AUDIO_HW_H
@@ -801,6 +835,15 @@
     struct audio_patch patch;
 };
 
+#ifdef SOFT_VOLUME
+/* this struct is used for set/get values from AHAL*/
+struct soft_step_volume_params {
+    int period;
+    int step;
+    int curve;
+};
+#endif
+
 int select_devices(struct audio_device *adev,
                           audio_usecase_t uc_id);
 int disable_audio_route(struct audio_device *adev,