3 files changed, 23 insertions, 0 deletions

diff --git a/firmware/export/audiohw.h b/firmware/export/audiohw.h
index d1579b5b93..1cabf6f782 100644
--- a/firmware/export/audiohw.h
+++ b/firmware/export/audiohw.h
@@ -40,6 +40,7 @@
 #define MONO_VOL_CAP          (1 << 10)
 #define LIN_GAIN_CAP          (1 << 11)
 #define MIC_GAIN_CAP          (1 << 12)
+#define FILTER_ROLL_OFF_CAP   (1 << 13)
 
 /* Used by every driver to export its min/max/default values for its audio
    settings. */
@@ -269,6 +270,11 @@ enum AUDIOHW_EQ_SETTINGS
 #define AUDIOHW_HAVE_MIC_GAIN
 #endif
 #endif /* HAVE_RECORDING */
+
+#if (AUDIOHW_CAPS & FILTER_ROLL_OFF_CAP)
+#define AUDIOHW_HAVE_FILTER_ROLL_OFF
+#endif
+
 #endif /* AUDIOHW_CAPS */
 
 #ifdef HAVE_SW_TONE_CONTROLS
@@ -454,6 +460,16 @@ void audiohw_set_eq_band_width(unsigned int band, int val);
 void audiohw_set_depth_3d(int val);
 #endif
 
+#ifdef AUDIOHW_HAVE_FILTER_ROLL_OFF
+/**
+ * Set DAC's oversampling filter roll-off.
+ * @param val 0 - sharp roll-off, 1 - slow roll-off.
+ * NOTE: AUDIOHW_CAPS need to contain
+ *          FILTER_ROLL_OFF_CAP
+ */
+void audiohw_set_filter_roll_off(int val);
+#endif
+
 
 void audiohw_set_frequency(int fsel);
 
diff --git a/firmware/export/audiohw_settings.h b/firmware/export/audiohw_settings.h
index f934c96302..675ec59a7b 100644
--- a/firmware/export/audiohw_settings.h
+++ b/firmware/export/audiohw_settings.h
@@ -110,6 +110,9 @@ AUDIOHW_SETTINGS(
 #if defined(AUDIOHW_HAVE_DEPTH_3D)
     AUDIOHW_SETTING_ENT(DEPTH_3D,           sound_set_depth_3d)
 #endif
+#if defined(AUDIOHW_HAVE_FILTER_ROLL_OFF)
+    AUDIOHW_SETTING_ENT(FILTER_ROLL_OFF,    sound_set_filter_roll_off)
+#endif
 /* Hardware EQ tone controls */
 #if defined(AUDIOHW_HAVE_EQ)
     AUDIOHW_SETTING_ENT(EQ_BAND1_GAIN,      sound_set_hw_eq_band1_gain)
diff --git a/firmware/export/sound.h b/firmware/export/sound.h
index fa76c67b1f..501c6a48a1 100644
--- a/firmware/export/sound.h
+++ b/firmware/export/sound.h
@@ -51,6 +51,10 @@ void sound_set_treble_cutoff(int value);
 void sound_set_depth_3d(int value);
 #endif
 
+#if defined(AUDIOHW_HAVE_FILTER_ROLL_OFF)
+void sound_set_filter_roll_off(int value);
+#endif
+
 #ifdef AUDIOHW_HAVE_EQ
 /*
  * band = SOUND_EQ_BANDb