iBasso DX50: Digital filter roll off setting.

This patch enables "Settings -> Sound Settings -> DAC's filter roll-off" for the
iBasso DX50.

Confirmed working on iBasso DX50, firmware 1.6.

Change-Id: I901615541d8fa4f6550c5156cf8c6069f5bdf9d0

1 files changed, 11 insertions, 0 deletions

diff --git a/firmware/target/hosted/ibasso/dx50/audiohw-dx50.c b/firmware/target/hosted/ibasso/dx50/audiohw-dx50.c
index 5e61348c8d..4ed181ede9 100644
--- a/firmware/target/hosted/ibasso/dx50/audiohw-dx50.c
+++ b/firmware/target/hosted/ibasso/dx50/audiohw-dx50.c
@@ -66,3 +66,14 @@ void audiohw_set_volume(int volume)
         DEBUGF("ERROR %s: Can not set volume.", __func__);
     }
 }
+
+
+void audiohw_set_filter_roll_off(int val)
+{
+    DEBUGF("DEBUG %s: val: %d", __func__, val);
+
+    if(! sysfs_set_char(SYSFS_ES9018_FILTER, (char) val))
+    {
+        DEBUGF("ERROR %s: Can not set roll off filter.", __func__);
+    }
+}