1 files changed, 7 insertions, 0 deletions

diff --git a/firmware/export/wm8975.h b/firmware/export/wm8975.h
index 005535bfaf..c00303a6a8 100644
--- a/firmware/export/wm8975.h
+++ b/firmware/export/wm8975.h
@@ -20,6 +20,13 @@
 #ifndef _WM8975_H
 #define _WM8975_H
 
+/* volume/balance/treble/bass interdependency */
+#define VOLUME_MIN -730
+#define VOLUME_MAX  60
+
+extern int tenthdb2master(int db);
+extern int tenthdb2mixer(int db);
+
 extern void audiohw_reset(void);
 extern int audiohw_init(void);
 extern void audiohw_enable_output(bool enable);