1 files changed, 7 insertions, 0 deletions

diff --git a/firmware/export/wm8731l.h b/firmware/export/wm8731l.h
index 5783be17cc..b6fa13f6cb 100644
--- a/firmware/export/wm8731l.h
+++ b/firmware/export/wm8731l.h
@@ -20,6 +20,13 @@
 #ifndef _WM8731L_H
 #define _WM8731L_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);