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, 4 insertions, 0 deletions

diff --git a/firmware/target/hosted/ibasso/sysfs-ibasso.c b/firmware/target/hosted/ibasso/sysfs-ibasso.c
index 8ca3edf387..5269c16704 100644
--- a/firmware/target/hosted/ibasso/sysfs-ibasso.c
+++ b/firmware/target/hosted/ibasso/sysfs-ibasso.c
@@ -43,6 +43,9 @@ static const char* SYSFS_PATHS[] =
     /* SYSFS_DX90_ES9018_VOLUME */
     "/sys/class/codec/es9018_volume",
 
+    /* SYSFS_ES9018_FILTER */
+    "/sys/class/codec/es9018_filter",
+
     /* SYSFS_MUTE */
     "/sys/class/codec/mute",
 
@@ -280,6 +283,7 @@ bool sysfs_set_char(enum sys_fs_interface_id id, char value)
     {
         case SYSFS_MUTE:
         case SYSFS_WM8740_MUTE:
+        case SYSFS_ES9018_FILTER:
         {
             break;
         }